ABI testing symbols

Documents interfaces that are felt to be stable, as the main development of this interface has been completed.

The interface can be changed to add new features, but the current interface will not break by doing this, unless grave errors or security problems are found in them.

Userspace programs can start to rely on these interfaces, but they must be aware of changes that can occur before these interfaces move to be marked stable.

Programs that use these interfaces are strongly encouraged to add their name to the description of these interfaces, so that the kernel developers can easily notify them if any changes occur.

.../XXXXXXX.ipa/endpoint_id/

.../XXXXXXX.ipa/endpoint_id/

Defined on file sysfs-devices-platform-soc-ipa

The .../XXXXXXX.ipa/endpoint_id/ directory contains attributes that define IDs associated with IPA endpoints. The “rx” or “tx” in an endpoint name is from the perspective of the AP. An endpoint ID is a small unsigned integer.

.../XXXXXXX.ipa/endpoint_id/modem_rx

.../XXXXXXX.ipa/endpoint_id/modem_rx

Defined on file sysfs-devices-platform-soc-ipa

The .../XXXXXXX.ipa/endpoint_id/modem_rx file contains the ID of the AP endpoint on which packets originating from the embedded modem are received.

.../XXXXXXX.ipa/endpoint_id/modem_tx

.../XXXXXXX.ipa/endpoint_id/modem_tx

Defined on file sysfs-devices-platform-soc-ipa

The .../XXXXXXX.ipa/endpoint_id/modem_tx file contains the ID of the AP endpoint on which packets destined for the embedded modem are sent.

.../XXXXXXX.ipa/endpoint_id/monitor_rx

.../XXXXXXX.ipa/endpoint_id/monitor_rx

Defined on file sysfs-devices-platform-soc-ipa

The .../XXXXXXX.ipa/endpoint_id/monitor_rx file contains the ID of the AP endpoint on which IPA “monitor” data is received. The monitor endpoint supplies replicas of packets that enter the IPA hardware for processing. Each replicated packet is preceded by a fixed-size “ODL” header (see .../XXXXXXX.ipa/feature/monitor, above). Large packets are truncated, to reduce the bandwidth required to provide the monitor function.

.../XXXXXXX.ipa/feature/

.../XXXXXXX.ipa/feature/

Defined on file sysfs-devices-platform-soc-ipa

The .../XXXXXXX.ipa/feature/ directory contains a set of attributes describing features implemented by the IPA hardware.

.../XXXXXXX.ipa/feature/rx_offload

.../XXXXXXX.ipa/feature/rx_offload

Defined on file sysfs-devices-platform-soc-ipa

The .../XXXXXXX.ipa/feature/rx_offload file contains a string indicating the type of receive checksum offload that is supported by the hardware. The possible values are “MAPv4” or “MAPv5”.

.../XXXXXXX.ipa/feature/tx_offload

.../XXXXXXX.ipa/feature/tx_offload

Defined on file sysfs-devices-platform-soc-ipa

The .../XXXXXXX.ipa/feature/tx_offload file contains a string indicating the type of transmit checksum offload that is supported by the hardware. The possible values are “MAPv4” or “MAPv5”.

.../XXXXXXX.ipa/modem/

.../XXXXXXX.ipa/modem/

Defined on file sysfs-devices-platform-soc-ipa

The .../XXXXXXX.ipa/modem/ directory contains attributes describing properties of the modem embedded in the SoC.

.../XXXXXXX.ipa/modem/rx_endpoint_id

.../XXXXXXX.ipa/modem/rx_endpoint_id

Defined on file sysfs-devices-platform-soc-ipa

The .../XXXXXXX.ipa/modem/rx_endpoint_id file duplicates the value found in .../XXXXXXX.ipa/endpoint_id/modem_rx.

.../XXXXXXX.ipa/modem/tx_endpoint_id

.../XXXXXXX.ipa/modem/tx_endpoint_id

Defined on file sysfs-devices-platform-soc-ipa

The .../XXXXXXX.ipa/modem/tx_endpoint_id file duplicates the value found in .../XXXXXXX.ipa/endpoint_id/modem_tx.

.../XXXXXXX.ipa/version

.../XXXXXXX.ipa/version

Defined on file sysfs-devices-platform-soc-ipa

The .../XXXXXXX.ipa/version file contains the IPA hardware version, as a period-separated set of two or three integers (e.g., “3.5.1” or “4.2”).

Symbols under /config/acpi

/config/acpi

Defined on file configfs-acpi

This represents the ACPI subsystem entry point directory. It contains sub-groups corresponding to ACPI configurable options.

/config/acpi/table

Defined on file configfs-acpi

This group contains the configuration for user defined ACPI tables. The attributes of a user define table are:

aml

  • a binary attribute that the user can use to fill in the ACPI aml definitions. Once the aml data is written to this file and the file is closed the table will be loaded and ACPI devices will be enumerated. To check if the operation is successful the user must check the error code for close(). If the operation is successful, subsequent writes to this attribute will fail.

The rest of the attributes are read-only and are valid only after the table has been loaded by filling the aml entry:

signature

  • ASCII table signature

length

  • length of table in bytes, including the header

revision

  • ACPI Specification minor version number

oem_id

  • ASCII OEM identification

oem_table_id

  • ASCII OEM table identification

oem_revision

  • OEM revision number

asl_compiler_id

  • ASCII ASL compiler vendor ID

asl_compiler_revision

  • ASL compiler version

Symbols under /config/iio

/config/iio

Defined on file configfs-iio

This represents Industrial IO configuration entry point directory. It contains sub-groups corresponding to IIO objects.

/config/iio/devices

Defined on file configfs-iio

Industrial IO software devices directory.

/config/iio/devices/dummy

Defined on file configfs-iio

Dummy IIO devices directory. Creating a directory here will result in creating a dummy IIO device in the IIO subsystem.

/config/iio/triggers

Defined on file configfs-iio

Industrial IO software triggers directory.

/config/iio/triggers/hrtimers

Defined on file configfs-iio

High resolution timers directory. Creating a directory here will result in creating a hrtimer trigger in the IIO subsystem.

Symbols under /config/pcie-gadget

/config/pcie-gadget

Defined on file configfs-spear-pcie-gadget

Interface is used to configure selected dual mode PCIe controller as device and then program its various registers to configure it as a particular device type. This interfaces can be used to show spear’s PCIe device capability.

Nodes are only visible when configfs is mounted. To mount configfs in /config directory use:

# mount -t configfs none /config/

For nth PCIe Device Controller /config/pcie-gadget.n/:

link

used to enable ltssm and read its status.

int_type

used to configure and read type of supported interrupt

no_of_msi

used to configure number of MSI vector needed and to read no of MSI granted.

inta

write 1 to assert INTA and 0 to de-assert.

send_msi

write MSI vector to be sent.

vendor_id

used to write and read vendor id (hex)

device_id

used to write and read device id (hex)

bar0_size

used to write and read bar0_size

bar0_address

used to write and read bar0 mapped area in hex.

bar0_rw_offset

used to write and read offset of bar0 where bar0_data will be written or read.

bar0_data

used to write and read data at bar0_rw_offset.

Symbols under /config/rdma_cm

/config/rdma_cm

Defined on file configfs-rdma_cm

Interface is used to configure RDMA-cable HCAs in respect to RDMA-CM attributes.

Attributes are visible only when configfs is mounted. To mount configfs in /config directory use: # mount -t configfs none /config/

In order to set parameters related to a specific HCA, a directory for this HCA has to be created: mkdir -p /config/rdma_cm/<hca>

/config/rdma_cm/<hca>/ports/<port-num>/default_roce_mode

Defined on file configfs-rdma_cm

RDMA-CM based connections from HCA <hca> at port <port-num> will be initiated with this RoCE type as default. The possible RoCE types are either “IB/RoCE v1” or “RoCE v2”. This parameter has RW access.

/config/rdma_cm/<hca>/ports/<port-num>/default_roce_tos

Defined on file configfs-rdma_cm

RDMA-CM QPs from HCA <hca> at port <port-num> will be created with this TOS as default. This can be overridden by using the rdma_set_option API. The possible RoCE TOS values are 0-255.

Symbols under /config/stp-policy

/config/stp-policy

Defined on file configfs-stp-policy

This group contains policies mandating Master/Channel allocation for software sources wishing to send trace data over an STM device.

/config/stp-policy/<device>.<policy>

Defined on file configfs-stp-policy

This group is the root of a policy; its name is a concatenation of an stm device name to which this policy applies and an arbitrary string. If <device> part doesn’t match an existing stm device, mkdir will fail with ENODEV; if that device already has a policy assigned to it, mkdir will fail with EBUSY.

/config/stp-policy/<device>.<policy>/<node>

Defined on file configfs-stp-policy

Policy node is a string identifier that software clients will use to request a master/channel to be allocated and assigned to them.

/config/stp-policy/<device>.<policy>/<node>/channels

Defined on file configfs-stp-policy

Range of channels from which to allocate for users of this node. Write two numbers: the first channel and the last channel number.

/config/stp-policy/<device>.<policy>/<node>/masters

Defined on file configfs-stp-policy

Range of masters from which to allocate for users of this node. Write two numbers: the first master and the last master number.

/config/stp-policy/<device>.<policy>/device

Defined on file configfs-stp-policy

STM device to which this policy applies, read only. Same as the <device> component of its parent directory.

/config/stp-policy/<device>:p_sys-t.<policy>/<node>/clocksync_interval

Defined on file configfs-stp-policy-p_sys-t

Time interval in milliseconds. Send a CLOCKSYNC packet if this many milliseconds have passed since the previous CLOCKSYNC packet from this source. Zero is the default and stands for “never send the CLOCKSYNC”. It makes sense to use this option with sources that generate constant and/or periodic data, like stm_heartbeat.

/config/stp-policy/<device>:p_sys-t.<policy>/<node>/do_len

Defined on file configfs-stp-policy-p_sys-t

Include payload length in the MIPI SyS-T header, boolean. If enabled, the SyS-T protocol encoder will include payload length in each packet’s metadata. This is normally redundant if the underlying transport protocol supports marking message boundaries (which STP does), so this is off by default.

/config/stp-policy/<device>:p_sys-t.<policy>/<node>/ts_interval

Defined on file configfs-stp-policy-p_sys-t

Time interval in milliseconds. Include a timestamp in the MIPI SyS-T packet metadata, if this many milliseconds have passed since the previous packet from this source. Zero is the default and stands for “never send the timestamp”.

/config/stp-policy/<device>:p_sys-t.<policy>/<node>/uuid

Defined on file configfs-stp-policy-p_sys-t

UUID source identifier string, RW. Default value is randomly generated at the mkdir <node> time. Data coming from trace sources that use this <node> will be tagged with this UUID in the MIPI SyS-T packet stream, to allow the decoder to discern between different sources within the same master/channel range, and identify the higher level decoders that may be needed for each source.

Symbols under /config/usb-gadget

/config/usb-gadget

Defined on file configfs-usb-gadget

This group contains sub-groups corresponding to created USB gadgets.

/config/usb-gadget/gadget

Defined on file configfs-usb-gadget

The attributes of a gadget:

UDC

bind a gadget to UDC/unbind a gadget; write UDC’s name found in /sys/class/udc/* to bind a gadget, empty string “” to unbind.

max_speed

maximum speed the driver supports. Valid names are super-speed-plus, super-speed, high-speed, full-speed, and low-speed.

bDeviceClass

USB device class code

bDeviceSubClass

USB device subclass code

bDeviceProtocol

USB device protocol code

bMaxPacketSize0

maximum endpoint 0 packet size

bcdDevice

bcd device release number

bcdUSB

bcd USB specification version number

idProduct

product ID

idVendor

vendor ID

/config/usb-gadget/gadget/configs

Defined on file configfs-usb-gadget

This group contains a USB gadget’s configurations

/config/usb-gadget/gadget/configs/config

Defined on file configfs-usb-gadget

The attributes of a configuration:

bmAttributes

configuration characteristics

MaxPower

maximum power consumption from the bus

/config/usb-gadget/gadget/configs/config/strings

Defined on file configfs-usb-gadget

This group contains subdirectories for language-specific strings for this configuration.

/config/usb-gadget/gadget/configs/config/strings/language

Defined on file configfs-usb-gadget

The attributes:

configuration

configuration description

/config/usb-gadget/gadget/functions

Defined on file configfs-usb-gadget

This group contains functions available to this USB gadget.

/config/usb-gadget/gadget/functions/<func>.<inst>/interface.<n>

Defined on file configfs-usb-gadget

This group contains “Feature Descriptors” specific for one gadget’s USB interface or one interface group described by an IAD.

The attributes:

compatible_id

8-byte string for “Compatible ID”

sub_compatible_id

8-byte string for “Sub Compatible ID”

/config/usb-gadget/gadget/functions/<func>.<inst>/interface.<n>/<property>

Defined on file configfs-usb-gadget

This group contains “Extended Property Descriptors” specific for one gadget’s USB interface or one interface group described by an IAD.

The attributes:

type

value 1..7 for interpreting the data

  • 1: unicode string

  • 2: unicode string with environment variable

  • 3: binary

  • 4: little-endian 32-bit

  • 5: big-endian 32-bit

  • 6: unicode string with a symbolic link

  • 7: multiple unicode strings

data

blob of data to be interpreted depending on type

/config/usb-gadget/gadget/functions/Loopback.name

Defined on file configfs-usb-gadget-loopback

The attributes:

qlen

depth of loopback queue

buflen

buffer length

/config/usb-gadget/gadget/functions/SourceSink.name

Defined on file configfs-usb-gadget-sourcesink

The attributes:

pattern

0 (all zeros), 1 (mod63), 2 (none)

isoc_interval

1..16

isoc_maxpacket

0 - 1023 (fs), 0 - 1024 (hs/ss)

isoc_mult

0..2 (hs/ss only)

isoc_maxburst

0..15 (ss only)

buflen

buffer length

bulk_qlen

depth of queue for bulk

iso_qlen

depth of queue for iso

/config/usb-gadget/gadget/functions/acm.name

Defined on file configfs-usb-gadget-acm

This item contains just one readonly attribute: port_num. It contains the port number of the /dev/ttyGS<n> device associated with acm function’s instance “name”.

/config/usb-gadget/gadget/functions/ecm.name

Defined on file configfs-usb-gadget-ecm

The attributes:

ifname

  • network device interface name associated with this function instance

qmult

  • queue length multiplier for high and super speed

host_addr

  • MAC address of host’s end of this Ethernet over USB link

dev_addr

  • MAC address of device’s end of this Ethernet over USB link

/config/usb-gadget/gadget/functions/eem.name

Defined on file configfs-usb-gadget-eem

The attributes:

ifname

network device interface name associated with this function instance

qmult

queue length multiplier for high and super speed

host_addr

MAC address of host’s end of this Ethernet over USB link

dev_addr

MAC address of device’s end of this Ethernet over USB link

/config/usb-gadget/gadget/functions/ffs.name

Defined on file configfs-usb-gadget-ffs

The purpose of this directory is to create and remove it.

A corresponding USB function instance is created/removed.

All attributes are read only:

ready

1 if the function is ready to be used, E.G. if userspace has written descriptors and strings to ep0, so the gadget can be enabled - 0 otherwise.

All other parameters are set through FunctionFS.

/config/usb-gadget/gadget/functions/geth.name

Defined on file configfs-usb-gadget-subset

The attributes:

ifname

network device interface name associated with this function instance

qmult

queue length multiplier for high and super speed

host_addr

MAC address of host’s end of this Ethernet over USB link

dev_addr

MAC address of device’s end of this Ethernet over USB link

/config/usb-gadget/gadget/functions/gser.name

Defined on file configfs-usb-gadget-serial

This item contains just one readonly attribute: port_num. It contains the port number of the /dev/ttyGS<n> device associated with gser function’s instance “name”.

/config/usb-gadget/gadget/functions/hid.name

Defined on file configfs-usb-gadget-hid

The attributes:

protocol

HID protocol to use

report_desc

blob corresponding to HID report descriptors except the data passed through /dev/hidg<N>

report_length

HID report length

subclass

HID device subclass to use

/config/usb-gadget/gadget/functions/mass_storage.name

Defined on file configfs-usb-gadget-mass-storage

The attributes:

stall

Set to permit function to halt bulk endpoints. Disabled on some USB devices known not to work correctly. You should set it to true.

num_buffers

Number of pipeline buffers. Valid numbers are 2..4. Available only if CONFIG_USB_GADGET_DEBUG_FILES is set.

/config/usb-gadget/gadget/functions/mass_storage.name/lun.name

Defined on file configfs-usb-gadget-mass-storage

The attributes:

file

The path to the backing file for the LUN. Required if LUN is not marked as removable.

ro

Flag specifying access to the LUN shall be read-only. This is implied if CD-ROM emulation is enabled as well as when it was impossible to open “filename” in R/W mode.

removable

Flag specifying that LUN shall be indicated as being removable.

cdrom

Flag specifying that LUN shall be reported as being a CD-ROM.

nofua

Flag specifying that FUA flag in SCSI WRITE(10,12)

forced_eject

This write-only file is useful only when the function is active. It causes the backing file to be forcibly detached from the LUN, regardless of whether the host has allowed it. Any non-zero number of bytes written will result in ejection.

/config/usb-gadget/gadget/functions/midi.name

Defined on file configfs-usb-gadget-midi

The attributes:

index

index value for the USB MIDI adapter

id

ID string for the USB MIDI adapter

buflen

MIDI buffer length

qlen

USB read request queue length

in_ports

number of MIDI input ports

out_ports

number of MIDI output ports

/config/usb-gadget/gadget/functions/midi2.name

Defined on file configfs-usb-gadget-midi2

The attributes:

process_ump

Flag to process UMP Stream messages (0 or 1)

static_block

Flag for static blocks (0 or 1)

iface_name

MIDI interface name string

/config/usb-gadget/gadget/functions/midi2.name/ep.number

Defined on file configfs-usb-gadget-midi2

This group contains a UMP Endpoint configuration. A new Endpoint starts from 0, and can be up to 3.

The attributes:

protocol_caps

MIDI protocol capabilities (1, 2 or 3 for both)

protocol

Default MIDI protocol (1 or 2)

ep_name

UMP Endpoint name string

product_id

Product ID string

manufacturer

Manufacture ID (24 bit)

family

Device family ID (16 bit)

model

Device model ID (16 bit)

sw_revision

Software Revision (32 bit)

/config/usb-gadget/gadget/functions/midi2.name/ep.number/block.number

Defined on file configfs-usb-gadget-midi2

This group contains a UMP Function Block configuration. A new block starts from 0, and can be up to 31.

The attributes:

name

Function Block name string

direction

1: input, 2: output, 3: bidirectional

first_group

The first UMP Group number (0-15)

num_groups

The number of groups in this FB (1-16)

midi1_first_group

The first UMP Group number for MIDI 1.0 (0-15)

midi1_num_groups

The number of groups for MIDI 1.0 (0-16)

ui_hint

0: unknown, 1: receiver, 2: sender, 3: both

midi_ci_verison

Supported MIDI-CI version number (8 bit)

is_midi1

Legacy MIDI 1.0 device (0, 1 or 2)

sysex8_streams

Max number of SysEx8 streams (8 bit)

active

Active FB flag (0 or 1)

/config/usb-gadget/gadget/functions/ncm.name

Defined on file configfs-usb-gadget-ncm

The attributes:

ifname - network device interface name associated with

this function instance

qmult - queue length multiplier for high and

super speed

host_addr - MAC address of host’s end of this

Ethernet over USB link

dev_addr - MAC address of device’s end of this

Ethernet over USB link

/config/usb-gadget/gadget/functions/obex.name

Defined on file configfs-usb-gadget-obex

This item contains just one readonly attribute: port_num. It contains the port number of the /dev/ttyGS<n> device associated with obex function’s instance “name”.

/config/usb-gadget/gadget/functions/phonet.name

Defined on file configfs-usb-gadget-phonet

This item contains just one readonly attribute: ifname. It contains the network interface name assigned during network device registration.

/config/usb-gadget/gadget/functions/printer.name

Defined on file configfs-usb-gadget-printer

The attributes:

pnp_string

Data to be passed to the host in pnp string

q_len

Number of requests per endpoint

/config/usb-gadget/gadget/functions/rndis.name

Defined on file configfs-usb-gadget-rndis

The attributes:

ifname

network device interface name associated with this function instance

qmult

queue length multiplier for high and super speed

host_addr

MAC address of host’s end of this Ethernet over USB link

dev_addr

MAC address of device’s end of this Ethernet over USB link

class

USB interface class, default is 02 (hex)

subclass

USB interface subclass, default is 06 (hex)

protocol

USB interface protocol, default is 00 (hex)

/config/usb-gadget/gadget/functions/tcm.name

Defined on file configfs-usb-gadget-tcm

There are no attributes because all the configuration is performed in the “target” subsystem of configfs.

/config/usb-gadget/gadget/functions/uac1.name

Defined on file configfs-usb-gadget-uac1

The attributes:

c_chmask

capture channel mask

c_srate

list of capture sampling rates (comma-separated)

c_ssize

capture sample size (bytes)

c_mute_present

capture mute control enable

c_volume_present

capture volume control enable

c_volume_min

capture volume control min value (in 1/256 dB)

c_volume_max

capture volume control max value (in 1/256 dB)

c_volume_res

capture volume control resolution (in 1/256 dB)

p_chmask

playback channel mask

p_srate

list of playback sampling rates (comma-separated)

p_ssize

playback sample size (bytes)

p_mute_present

playback mute control enable

p_volume_present

playback volume control enable

p_volume_min

playback volume control min value (in 1/256 dB)

p_volume_max

playback volume control max value (in 1/256 dB)

p_volume_res

playback volume control resolution (in 1/256 dB)

req_number

the number of pre-allocated requests for both capture and playback

function_name

name of the interface

/config/usb-gadget/gadget/functions/uac1_legacy.name

Defined on file configfs-usb-gadget-uac1_legacy

The attributes:

audio_buf_size - audio buffer size fn_cap - capture pcm device file name fn_cntl - control device file name fn_play - playback pcm device file name req_buf_size - ISO OUT endpoint request buffer size req_count - ISO OUT endpoint request count

/config/usb-gadget/gadget/functions/uac2.name

Defined on file configfs-usb-gadget-uac2

The attributes:

c_chmask

capture channel mask

c_srate

list of capture sampling rates (comma-separated)

c_ssize

capture sample size (bytes)

c_hs_bint

capture bInterval for HS/SS (1-4: fixed, 0: auto)

c_sync

capture synchronization type (async/adaptive)

c_mute_present

capture mute control enable

c_volume_present

capture volume control enable

c_volume_min

capture volume control min value (in 1/256 dB)

c_volume_max

capture volume control max value (in 1/256 dB)

c_volume_res

capture volume control resolution (in 1/256 dB)

fb_max

maximum extra bandwidth in async mode

p_chmask

playback channel mask

p_srate

list of playback sampling rates (comma-separated)

p_ssize

playback sample size (bytes)

p_hs_bint

playback bInterval for HS/SS (1-4: fixed, 0: auto)

p_mute_present

playback mute control enable

p_volume_present

playback volume control enable

p_volume_min

playback volume control min value (in 1/256 dB)

p_volume_max

playback volume control max value (in 1/256 dB)

p_volume_res

playback volume control resolution (in 1/256 dB)

req_number

the number of pre-allocated requests for both capture and playback

function_name

name of the interface

c_terminal_type

code of the capture terminal type

p_terminal_type

code of the playback terminal type

/config/usb-gadget/gadget/functions/uvc.name

Defined on file configfs-usb-gadget-uvc

UVC function directory

streaming_maxburst

0..15 (ss only)

streaming_maxpacket

1..1023 (fs), 1..3072 (hs/ss)

streaming_interval

1..16

function_name

string [32]

/config/usb-gadget/gadget/functions/uvc.name/control

Defined on file configfs-usb-gadget-uvc

Control descriptors

All attributes read only except enable_interrupt_ep:

bInterfaceNumber

USB interface number for this streaming interface

enable_interrupt_ep

flag to enable the interrupt endpoint for the VC interface

/config/usb-gadget/gadget/functions/uvc.name/control/class

Defined on file configfs-usb-gadget-uvc

Class descriptors

/config/usb-gadget/gadget/functions/uvc.name/control/class/fs

Defined on file configfs-usb-gadget-uvc

Full speed control class descriptors

/config/usb-gadget/gadget/functions/uvc.name/control/class/ss

Defined on file configfs-usb-gadget-uvc

Super speed control class descriptors

/config/usb-gadget/gadget/functions/uvc.name/control/extensions

Defined on file configfs-usb-gadget-uvc

Extension unit descriptors

/config/usb-gadget/gadget/functions/uvc.name/control/extensions/name

Defined on file configfs-usb-gadget-uvc

Extension Unit (XU) Descriptor

bLength, bUnitID and iExtension are read-only. All others are read-write.

bLength

size of the descriptor in bytes

bUnitID

non-zero ID of this unit

guidExtensionCode

Vendor-specific code identifying the XU

bNumControls

number of controls in this XU

bNrInPins

number of input pins for this unit

baSourceID

list of the IDs of the units or terminals to which this XU is connected

bControlSize

size of the bmControls field in bytes

bmControls

list of bitmaps detailing which vendor specific controls are supported

iExtension

index of a string descriptor that describes this extension unit

/config/usb-gadget/gadget/functions/uvc.name/control/header

Defined on file configfs-usb-gadget-uvc

Control header descriptors

/config/usb-gadget/gadget/functions/uvc.name/control/header/name

Defined on file configfs-usb-gadget-uvc

Specific control header descriptors

dwClockFrequency bcdUVC

/config/usb-gadget/gadget/functions/uvc.name/control/processing

Defined on file configfs-usb-gadget-uvc

Processing unit descriptors

/config/usb-gadget/gadget/functions/uvc.name/control/processing/default

Defined on file configfs-usb-gadget-uvc

Default processing unit descriptors

All attributes read only except bmControls, which is read/write:

iProcessing

index of string descriptor

bmControls

bitmap specifying which controls are supported for the video stream

wMaxMultiplier

maximum digital magnification x100

bSourceID

id of the terminal to which this unit is connected

bUnitID

a non-zero id of this unit

/config/usb-gadget/gadget/functions/uvc.name/control/terminal

Defined on file configfs-usb-gadget-uvc

Terminal descriptors

/config/usb-gadget/gadget/functions/uvc.name/control/terminal/camera

Defined on file configfs-usb-gadget-uvc

Camera terminal descriptors

/config/usb-gadget/gadget/functions/uvc.name/control/terminal/camera/default

Defined on file configfs-usb-gadget-uvc

Default camera terminal descriptors

All attributes read only except bmControls, which is read/write:

bmControls

bitmap specifying which controls are supported for the video stream

wOcularFocalLength

the value of Locular

wObjectiveFocalLengthMax

the value of Lmin

wObjectiveFocalLengthMin

the value of Lmax

iTerminal

index of string descriptor

bAssocTerminal

id of the output terminal to which this terminal is connected

wTerminalType

terminal type

bTerminalID

a non-zero id of this terminal

/config/usb-gadget/gadget/functions/uvc.name/control/terminal/output

Defined on file configfs-usb-gadget-uvc

Output terminal descriptors

/config/usb-gadget/gadget/functions/uvc.name/control/terminal/output/default

Defined on file configfs-usb-gadget-uvc

Default output terminal descriptors

All attributes read only except bSourceID:

iTerminal

index of string descriptor

bSourceID

id of the terminal to which this terminal is connected

bAssocTerminal

id of the input terminal to which this output terminal is associated

wTerminalType

terminal type

bTerminalID

a non-zero id of this terminal

/config/usb-gadget/gadget/functions/uvc.name/streaming

Defined on file configfs-usb-gadget-uvc

Streaming descriptors

All attributes read only:

bInterfaceNumber

USB interface number for this streaming interface

/config/usb-gadget/gadget/functions/uvc.name/streaming/class

Defined on file configfs-usb-gadget-uvc

Streaming class descriptors

/config/usb-gadget/gadget/functions/uvc.name/streaming/class/fs

Defined on file configfs-usb-gadget-uvc

Full speed streaming class descriptors

/config/usb-gadget/gadget/functions/uvc.name/streaming/class/hs

Defined on file configfs-usb-gadget-uvc

High speed streaming class descriptors

/config/usb-gadget/gadget/functions/uvc.name/streaming/class/ss

Defined on file configfs-usb-gadget-uvc

Super speed streaming class descriptors

/config/usb-gadget/gadget/functions/uvc.name/streaming/color_matching

Defined on file configfs-usb-gadget-uvc

Color matching descriptors

/config/usb-gadget/gadget/functions/uvc.name/streaming/color_matching/default

Defined on file configfs-usb-gadget-uvc

Default color matching descriptors

All attributes read/write:

bMatrixCoefficients

matrix used to compute luma and chroma values from the color primaries

bTransferCharacteristics

optoelectronic transfer characteristic of the source picture, also called the gamma function

bColorPrimaries

color primaries and the reference white

/config/usb-gadget/gadget/functions/uvc.name/streaming/color_matching/name

Defined on file configfs-usb-gadget-uvc

Additional color matching descriptors

All attributes read/write:

bMatrixCoefficients

matrix used to compute luma and chroma values from the color primaries

bTransferCharacteristics

optoelectronic transfer characteristic of the source picture, also called the gamma function

bColorPrimaries

color primaries and the reference white

/config/usb-gadget/gadget/functions/uvc.name/streaming/header

Defined on file configfs-usb-gadget-uvc

Streaming header descriptors

/config/usb-gadget/gadget/functions/uvc.name/streaming/header/name

Defined on file configfs-usb-gadget-uvc

Specific streaming header descriptors

All attributes read only:

bTriggerUsage

how the host software will respond to a hardware trigger interrupt event

bTriggerSupport

flag specifying if hardware triggering is supported

bStillCaptureMethod

method of still image capture supported

bTerminalLink

id of the output terminal to which the video endpoint of this interface is connected

bmInfo

capabilities of this video streaming interface

/config/usb-gadget/gadget/functions/uvc.name/streaming/mjpeg

Defined on file configfs-usb-gadget-uvc

MJPEG format descriptors

/config/usb-gadget/gadget/functions/uvc.name/streaming/mjpeg/name

Defined on file configfs-usb-gadget-uvc

Specific MJPEG format descriptors

All attributes read only, except bmaControls and bDefaultFrameIndex:

bFormatIndex

unique id for this format descriptor; only defined after parent header is linked into the streaming class; read-only

bmaControls

this format’s data for bmaControls in the streaming header

bmInterlaceFlags

specifies interlace information, read-only

bAspectRatioY

the X dimension of the picture aspect ratio, read-only

bAspectRatioX

the Y dimension of the picture aspect ratio, read-only

bmFlags

characteristics of this format, read-only

bDefaultFrameIndex

optimum frame index for this stream

/config/usb-gadget/gadget/functions/uvc.name/streaming/mjpeg/name/name

Defined on file configfs-usb-gadget-uvc

Specific MJPEG frame descriptors

bFrameIndex

unique id for this framedescriptor; only defined after parent format is linked into the streaming header; read-only

dwFrameInterval

indicates how frame interval can be programmed; a number of values separated by newline can be specified

dwDefaultFrameInterval

the frame interval the device would like to use as default

dwMaxVideoFrameBufferSize

the maximum number of bytes the compressor will produce for a video frame or still image

dwMaxBitRate

the maximum bit rate at the shortest frame interval in bps

dwMinBitRate

the minimum bit rate at the longest frame interval in bps

wHeight

height of decoded bitmap frame in px

wWidth

width of decoded bitmam frame in px

bmCapabilities

still image support, fixed frame-rate support

/config/usb-gadget/gadget/functions/uvc.name/streaming/uncompressed

Defined on file configfs-usb-gadget-uvc

Uncompressed format descriptors

/config/usb-gadget/gadget/functions/uvc.name/streaming/uncompressed/name

Defined on file configfs-usb-gadget-uvc

Specific uncompressed format descriptors

bFormatIndex

unique id for this format descriptor; only defined after parent header is linked into the streaming class; read-only

bmaControls

this format’s data for bmaControls in the streaming header

bmInterlaceFlags

specifies interlace information, read-only

bAspectRatioY

the X dimension of the picture aspect ratio, read-only

bAspectRatioX

the Y dimension of the picture aspect ratio, read-only

bDefaultFrameIndex

optimum frame index for this stream

bBitsPerPixel

number of bits per pixel used to specify color in the decoded video frame

guidFormat

globally unique id used to identify stream-encoding format

/config/usb-gadget/gadget/functions/uvc.name/streaming/uncompressed/name/name

Defined on file configfs-usb-gadget-uvc

Specific uncompressed frame descriptors

bFrameIndex

unique id for this framedescriptor; only defined after parent format is linked into the streaming header; read-only

dwFrameInterval

indicates how frame interval can be programmed; a number of values separated by newline can be specified

dwDefaultFrameInterval

the frame interval the device would like to use as default

dwMaxVideoFrameBufferSize

the maximum number of bytes the compressor will produce for a video frame or still image

dwMaxBitRate

the maximum bit rate at the shortest frame interval in bps

dwMinBitRate

the minimum bit rate at the longest frame interval in bps

wHeight

height of decoded bitmap frame in px

wWidth

width of decoded bitmam frame in px

bmCapabilities

still image support, fixed frame-rate support

/config/usb-gadget/gadget/os_desc

Defined on file configfs-usb-gadget

This group contains “OS String” extension handling attributes.

use

flag turning “OS Descriptors” support on/off

b_vendor_code

one-byte value used for custom per-device and per-interface requests

qw_sign

an identifier to be reported as “OS String” proper

/config/usb-gadget/gadget/strings

Defined on file configfs-usb-gadget

This group contains subdirectories for language-specific strings for this gadget.

/config/usb-gadget/gadget/strings/language

Defined on file configfs-usb-gadget

The attributes:

serialnumber

gadget’s serial number (string)

product

gadget’s product description

manufacturer

gadget’s manufacturer description

/config/usb-gadget/gadget/webusb

Defined on file configfs-usb-gadget

This group contains “WebUSB” extension handling attributes.

use

flag turning “WebUSB” support on/off

bcdVersion

bcd WebUSB specification version number

bVendorCode

one-byte value used for custom per-device

landingPage

UTF-8 encoded URL of the device’s landing page

Symbols under /dev/gpiochip

/dev/gpiochip[0-9]+

Defined on file gpio-cdev

The character device files /dev/gpiochip* are the interface between GPIO chips and userspace.

The ioctl(2)-based ABI is defined in [include/uapi]<linux/gpio.h> and documented in GPIO Character Device Userspace API.

The following file operations are supported:

open(2)

Currently the only useful flags are O_RDWR.

ioctl(2)

Initiate various actions.

See GPIO Character Device Userspace API for a description of all ioctls.

close(2)

Stops and free up the I/O contexts that was associated with the file descriptor.

Users: TBD

Symbols under /dev/kmsg

/dev/kmsg

Defined on file dev-kmsg

The /dev/kmsg character device node provides userspace access to the kernel’s printk buffer.

Injecting messages:

Every write() to the opened device node places a log entry in the kernel’s printk buffer.

The logged line can be prefixed with a <N> syslog prefix, which carries the syslog priority and facility. The single decimal prefix number is composed of the 3 lowest bits being the syslog priority and the next 8 bits the syslog facility number.

If no prefix is given, the priority number is the default kernel log priority and the facility number is set to LOG_USER (1). It is not possible to inject messages from userspace with the facility number LOG_KERN (0), to make sure that the origin of the messages can always be reliably determined.

Accessing the buffer:

Every read() from the opened device node receives one record of the kernel’s printk buffer.

The first read() directly following an open() always returns first message in the buffer; there is no kernel-internal persistent state; many readers can concurrently open the device and read from it, without affecting other readers.

Every read() will receive the next available record. If no more records are available read() will block, or if O_NONBLOCK is used -EAGAIN returned.

Messages in the record ring buffer get overwritten as whole, there are never partial messages received by read().

In case messages get overwritten in the circular buffer while the device is kept open, the next read() will return -EPIPE, and the seek position be updated to the next available record. Subsequent reads() will return available records again.

Unlike the classic syslog() interface, the 64 bit record sequence numbers allow to calculate the amount of lost messages, in case the buffer gets overwritten. And they allow to reconnect to the buffer and reconstruct the read position if needed, without limiting the interface to a single reader.

The device supports seek with the following parameters:

SEEK_SET, 0

seek to the first entry in the buffer

SEEK_END, 0

seek after the last entry in the buffer

SEEK_DATA, 0

seek after the last record available at the time the last SYSLOG_ACTION_CLEAR was issued.

Other seek operations or offsets are not supported because of the special behavior this device has. The device allows to read or write only whole variable length messages (records) that are stored in a ring buffer.

Because of the non-standard behavior also the error values are non-standard. -ESPIPE is returned for non-zero offset. -EINVAL is returned for other operations, e.g. SEEK_CUR. This behavior and values are historical and could not be modified without the risk of breaking userspace.

The output format consists of a prefix carrying the syslog prefix including priority and facility, the 64 bit message sequence number and the monotonic timestamp in microseconds, and a flag field. All fields are separated by a ‘,’.

Future extensions might add more comma separated values before the terminating ‘;’. Unknown fields and values should be gracefully ignored.

The human readable text string starts directly after the ‘;’ and is terminated by a ‘n’. Untrusted values derived from hardware or other facilities are printed, therefore all non-printable characters and ‘' itself in the log message are escaped by “x00” C-style hex encoding.

A line starting with ‘ ‘, is a continuation line, adding key/value pairs to the log message, which provide the machine readable context of the message, for reliable processing in userspace.

Example:

7,160,424069,-;pci_root PNP0A03:00: host bridge window [io  0x0000-0x0cf7] (ignored)
 SUBSYSTEM=acpi
 DEVICE=+acpi:PNP0A03:00
6,339,5140900,-;NET: Registered protocol family 10
30,340,5690716,-;udevd[80]: starting version 181

The DEVICE= key uniquely identifies devices the following way:

b12:8

block dev_t

c127:3

char dev_t

n8

netdev ifindex

+sound:card0

subsystem:devname

The flags field carries ‘-’ by default. A ‘c’ indicates a fragment of a line. Note, that these hints about continuation lines are not necessarily correct, and the stream could be interleaved with unrelated messages, but merging the lines in the output usually produces better human readable results. A similar logic is used internally when messages are printed to the console, /proc/kmsg or the syslog() syscall.

By default, kernel tries to avoid fragments by concatenating when it can and fragments are rare; however, when extended console support is enabled, the in-kernel concatenation is disabled and /dev/kmsg output will contain more fragments. If the log consumer performs concatenation, the end result should be the same. In the future, the in-kernel concatenation may be removed entirely and /dev/kmsg users are recommended to implement fragment handling.

Users: dmesg(1), userspace kernel log consumers

Symbols under /dev/rtcX

/dev/rtcX

Defined on file rtc-cdev

The ioctl interface to drivers for real-time clocks (RTCs). Following actions are supported:

  • RTC_RD_TIME, RTC_SET_TIME: Read or set the RTC time. Time format is a Gregorian calendar date and 24 hour wall clock time.

  • RTC_AIE_ON, RTC_AIE_OFF: Enable or disable the alarm interrupt for RTCs that support alarms

  • RTC_ALM_READ, RTC_ALM_SET: Read or set the alarm time for RTCs that support alarms. Can be set upto 24 hours in the future. Requires a separate RTC_AIE_ON call to enable the alarm interrupt. (Prefer to use RTC_WKALM_*)

  • RTC_WKALM_RD, RTC_WKALM_SET: For RTCs that support a more powerful interface, which can issue alarms beyond 24 hours and enable IRQs in the same request.

  • RTC_PIE_ON, RTC_PIE_OFF: Enable or disable the periodic interrupt for RTCs that support periodic interrupts.

  • RTC_UIE_ON, RTC_UIE_OFF: Enable or disable the update interrupt for RTCs that support it.

  • RTC_IRQP_READ, RTC_IRQP_SET: Read or set the frequency for periodic interrupts for RTCs that support periodic interrupts. Requires a separate RTC_PIE_ON call to enable the periodic interrupts.

  • RTC_VL_READ: Read the voltage inputs status of the RTC when supported. The value is a bit field of RTC_VL_*, giving the status of the main and backup voltages.

  • RTC_VL_CLEAR: Clear the voltage status of the RTC. Some RTCs need user interaction when the backup power provider is replaced or charged to be able to clear the status.

The ioctl() calls supported by the older /dev/rtc interface are also supported by the newer RTC class framework. However, because the chips and systems are not standardized, some PC/AT functionality might not be provided. And in the same way, some newer features -- including those enabled by ACPI -- are exposed by the RTC class framework, but can’t be supported by the older driver.

Symbols under /dev/wmi

/dev/wmi/dell-smbios

Defined on file dell-smbios-wmi

Perform SMBIOS calls on supported Dell machines. through the Dell ACPI-WMI interface.

IOCTL’s and buffer formats are defined in: <uapi/linux/wmi.h>

  1. To perform an SMBIOS call from userspace, you’ll need to first determine the minimum size of the calling interface buffer for your machine. Platforms that contain larger buffers can return larger objects from the system firmware. Commonly this size is either 4k or 32k.

    To determine the size of the buffer read() a u64 dword from the WMI character device /dev/wmi/dell-smbios.

  2. After you’ve determined the minimum size of the calling interface buffer, you can allocate a structure that represents the structure documented above.

  3. In the ‘length’ object store the size of the buffer you determined above and allocated.

  4. In this buffer object, prepare as necessary for the SMBIOS call you’re interested in. Typically SMBIOS buffers have “class”, “select”, and “input” defined to values that coincide with the data you are interested in. Documenting class/select/input values is outside of the scope of this documentation. Check with the libsmbios project for further documentation on these values.

  1. Run the call by using ioctl() as described in the header.

  2. The output will be returned in the buffer object.

  3. Be sure to free up your allocated object.

Symbols under /kvd

/kvd/

Defined on file devlink-resource-mlxsw

The main database in the Spectrum device is a centralized KVD database used for many of the tables used to configure the chip including L2 FDB, L3 LPM, ECMP and more. The KVD is divided into two sections, the first is hash-based table and the second is a linear access table. The division between the linear and hash-based sections is static and require reload before the changes take effect.

Symbols under /kvd/hash_double

/kvd/hash_double

Defined on file devlink-resource-mlxsw

The hash based section of the KVD is managed by the switch device. Used in case the key is larger than 64 bit.

Symbols under /kvd/hash_single

/kvd/hash_single

Defined on file devlink-resource-mlxsw

The hash based section of the KVD is managed by the switch device. Used in case the key size is smaller or equal to 64bit.

Symbols under /kvd/linear

/kvd/linear

Defined on file devlink-resource-mlxsw

The linear section of the KVD is managed by software as a flat memory accessed using an index.

Symbols under /proc

/proc/*/attr/current

Defined on file procfs-attr-current

The current security information used by a Linux security module (LSM) that is active on the system. The details of permissions required to read from this interface and hence obtain the security state of the task identified is LSM dependent. A process cannot write to this interface unless it refers to itself. The other details of permissions required to write to this interface and hence change the security state of the task identified are LSM dependent. The format of the data used by this interface is LSM dependent. SELinux, Smack and AppArmor provide this interface.

Users: SELinux user-space Smack user-space AppArmor user-space

/proc/*/attr/exec

Defined on file procfs-attr-exec

The security information to be used on the process by a Linux security module (LSM) active on the system after a subsequent exec() call. The details of permissions required to read from this interface and hence obtain the security state of the task identified is LSM dependent. A process cannot write to this interface unless it refers to itself. The other details of permissions required to write to this interface and hence change the security state of the task identified are LSM dependent. The format of the data used by this interface is LSM dependent. SELinux and AppArmor provide this interface.

Users: SELinux user-space AppArmor user-space

/proc/*/attr/prev

Defined on file procfs-attr-prev

The security information used on the process by a Linux security module (LSM) active on the system prior to the most recent exec() call. The details of permissions required to read from this interface is LSM dependent. A process cannot write to this interface unless it refers to itself. The other details of permissions required to write to this interface are LSM dependent. The format of the data used by this interface is LSM dependent. SELinux and AppArmor provide this interface.

Users: SELinux user-space AppArmor user-space

Symbols under /proc/diskstats

/proc/diskstats

Defined on file procfs-diskstats

The /proc/diskstats file displays the I/O statistics of block devices. Each line contains the following 14 fields:

1

major number

2

minor number

3

device name

4

reads completed successfully

5

reads merged

6

sectors read

7

time spent reading (ms)

8

writes completed

9

writes merged

10

sectors written

11

time spent writing (ms)

12

I/Os currently in progress

13

time spent doing I/Os (ms)

14

weighted time spent doing I/Os (ms)

Kernel 4.18+ appends four more fields for discard tracking putting the total at 18:

15

discards completed successfully

16

discards merged

17

sectors discarded

18

time spent discarding

Kernel 5.5+ appends two more fields for flush requests:

19

flush requests completed successfully

20

time spent flushing

For more details refer to I/O statistics fields

Symbols under /proc/pid

/proc/pid/smaps_rollup

Defined on file procfs-smaps_rollup

This file provides pre-summed memory information for a process. The format is almost identical to /proc/pid/smaps, except instead of an entry for each VMA in a process, smaps_rollup has a single entry (tagged “[rollup]”) for which each field is the sum of the corresponding fields from all the maps in /proc/pid/smaps. Additionally, the fields Pss_Anon, Pss_File and Pss_Shmem are not present in /proc/pid/smaps. These fields represent the sum of the Pss field of each type (anon, file, shmem). For more details, see The /proc Filesystem and the procfs man page.

Typical output looks like this:

00100000-ff709000 ---p 00000000 00:00 0          [rollup]
Size:               1192 kB
KernelPageSize:        4 kB
MMUPageSize:           4 kB
Rss:                 884 kB
Pss:                 385 kB
Pss_Dirty:            68 kB
Pss_Anon:            301 kB
Pss_File:             80 kB
Pss_Shmem:             4 kB
Shared_Clean:        696 kB
Shared_Dirty:          0 kB
Private_Clean:       120 kB
Private_Dirty:        68 kB
Referenced:          884 kB
Anonymous:            68 kB
LazyFree:              0 kB
AnonHugePages:         0 kB
ShmemPmdMapped:        0 kB
Shared_Hugetlb:        0 kB
Private_Hugetlb:       0 kB
Swap:                  0 kB
SwapPss:               0 kB
Locked:              385 kB

Symbols under /sys

/sys/.../<device>/<UUID>/

Defined on file sysfs-bus-vfio-mdev

This directory represents device directory of mediated device. It contains all the attributes related to mediated device.

/sys/.../<device>/<UUID>/mdev_type

Defined on file sysfs-bus-vfio-mdev

This is symbolic link pointing to supported type, <type-id> directory of which this mediated device is created.

/sys/.../<device>/<UUID>/remove

Defined on file sysfs-bus-vfio-mdev

Writing ‘1’ to this file destroys the mediated device. The vendor driver can fail the remove() callback if that device is active and the vendor driver doesn’t support hot unplug. Example:

# echo 1 > /sys/bus/mdev/devices/<UUID>/remove

/sys/.../<device>/mdev_supported_types/

Defined on file sysfs-bus-vfio-mdev

This directory contains list of directories of currently supported mediated device types and their details for <device>. Supported type attributes are defined by the vendor driver who registers with Mediated device framework. Each supported type is a directory whose name is created by adding the device driver string as a prefix to the string provided by the vendor driver.

/sys/.../<device>/mdev_supported_types/<type-id>/

Defined on file sysfs-bus-vfio-mdev

This directory gives details of supported type, like name, description, available_instances, device_api etc. ‘device_api’ and ‘available_instances’ are mandatory attributes to be provided by vendor driver. ‘name’, ‘description’ and other vendor driver specific attributes are optional.

/sys/.../<device>/vfio-dev/vfioX/

Defined on file sysfs-devices-vfio-dev

This directory is created when the device is bound to a vfio driver. The layout under this directory matches what exists for a standard ‘struct device’. ‘X’ is a unique index marking this device in vfio.

/sys/.../events/illuminance_threshY_falling_value

/sys/.../events/illuminance_threshY_raising_value

Defined on file sysfs-bus-iio-light-lm3533-als

Specifies the value of threshold that the device is comparing against for the events enabled by in_illuminance0_thresh_either_en (0..255), where Y in 0..3.

Note that threshY_falling must be less than or equal to threshY_raising.

These thresholds correspond to the eight zone-boundary registers (boundaryY_{low,high}) and define the five light zones.

/sys/.../events/in_accel_gesture_doubletap_tap2_min_delay

Defined on file sysfs-bus-iio

Specifies the minimum quiet time in seconds between the two taps of a double tap.

/sys/.../events/in_accel_gesture_doubletap_tap2_min_delay_available

Defined on file sysfs-bus-iio

Lists all available delay values between two taps in the double tap. Units in seconds.

/sys/.../events/in_accel_gesture_singletap_en

/sys/.../events/in_accel_gesture_doubletap_en

Defined on file sysfs-bus-iio

Device generates an event on a single or double tap.

/sys/.../events/in_accel_gesture_singletap_reset_timeout

/sys/.../events/in_accel_gesture_doubletap_reset_timeout

Defined on file sysfs-bus-iio

Specifies the timeout value in seconds for the tap detector to not to look for another tap event after the event as occurred. Basically the minimum quiet time between the two single-tap’s or two double-tap’s.

/sys/.../events/in_accel_gesture_singletap_value

/sys/.../events/in_accel_gesture_doubletap_value

Defined on file sysfs-bus-iio

Specifies the threshold value that the device is comparing against to generate the tap gesture event. The lower threshold value increases the sensitivity of tap detection. Units and the exact meaning of value are device-specific.

/sys/.../events/in_accel_gesture_tap_maxtomin_time

Defined on file sysfs-bus-iio

Specifies the maximum time difference allowed between upper and lower peak of tap to consider it as the valid tap event. Units in seconds.

/sys/.../events/in_accel_gesture_tap_maxtomin_time_available

Defined on file sysfs-bus-iio

Lists all available time values between upper peak to lower peak. Units in seconds.

/sys/.../events/in_accel_gesture_tap_reset_timeout_available

Defined on file sysfs-bus-iio

Lists all available tap reset timeout values. Units in seconds.

/sys/.../events/in_accel_gesture_tap_value_available

Defined on file sysfs-bus-iio

Lists all available threshold values which can be used to modify the sensitivity of the tap detection.

/sys/.../events/in_accel_gesture_tap_wait_dur

Defined on file sysfs-bus-iio

Timeout value in seconds for tap gesture confirmation.

/sys/.../events/in_accel_gesture_tap_wait_dur_available

Defined on file sysfs-bus-iio

List of available timeout value for tap gesture confirmation.

/sys/.../events/in_accel_gesture_tap_wait_timeout

Defined on file sysfs-bus-iio

Enable tap gesture confirmation with timeout.

/sys/.../events/in_accel_raw_mag_value

/sys/.../events/in_accel_x_raw_mag_rising_value

/sys/.../events/in_accel_y_raw_mag_rising_value

/sys/.../events/in_accel_z_raw_mag_rising_value

Defined on file sysfs-bus-iio

The value to which the magnitude of the channel is compared. If number or direction is not specified, applies to all channels of this type.

/sys/.../events/in_accel_scale

/sys/.../events/in_accel_peak_scale

/sys/.../events/in_anglvel_scale

/sys/.../events/in_magn_scale

/sys/.../events/in_rot_from_north_magnetic_scale

/sys/.../events/in_rot_from_north_true_scale

/sys/.../events/in_voltage_scale

/sys/.../events/in_voltage_supply_scale

/sys/.../events/in_temp_scale

/sys/.../events/in_illuminance_scale

/sys/.../events/in_proximity_scale

Defined on file sysfs-bus-iio

Specifies the conversion factor from the standard units to device specific units used to set the event trigger threshold.

/sys/.../events/in_accel_thresh_rising_high_pass_filter_3db

/sys/.../events/in_anglvel_thresh_rising_high_pass_filter_3db

/sys/.../events/in_magn_thresh_rising_high_pass_filter_3db

Defined on file sysfs-bus-iio

If a high pass filter can be applied to the event generation this property gives its 3db frequency in Hz. A value of zero disables the filter.

/sys/.../events/in_accel_thresh_rising_low_pass_filter_3db

/sys/.../events/in_anglvel_thresh_rising_low_pass_filter_3db

/sys/.../events/in_magn_thresh_rising_low_pass_filter_3db

Defined on file sysfs-bus-iio

If a low pass filter can be applied to the event generation this property gives its 3db frequency in Hz. A value of zero disables the filter.

/sys/.../events/in_accel_thresh_rising_value

/sys/.../events/in_accel_thresh_falling_value

/sys/.../events/in_accel_x_raw_thresh_rising_value

/sys/.../events/in_accel_x_raw_thresh_falling_value

/sys/.../events/in_accel_y_raw_thresh_rising_value

/sys/.../events/in_accel_y_raw_thresh_falling_value

/sys/.../events/in_accel_z_raw_thresh_rising_value

/sys/.../events/in_accel_z_raw_thresh_falling_value

/sys/.../events/in_anglvel_x_raw_thresh_rising_value

/sys/.../events/in_anglvel_x_raw_thresh_falling_value

/sys/.../events/in_anglvel_y_raw_thresh_rising_value

/sys/.../events/in_anglvel_y_raw_thresh_falling_value

/sys/.../events/in_anglvel_z_raw_thresh_rising_value

/sys/.../events/in_anglvel_z_raw_thresh_falling_value

/sys/.../events/in_magn_x_raw_thresh_rising_value

/sys/.../events/in_magn_x_raw_thresh_falling_value

/sys/.../events/in_magn_y_raw_thresh_rising_value

/sys/.../events/in_magn_y_raw_thresh_falling_value

/sys/.../events/in_magn_z_raw_thresh_rising_value

/sys/.../events/in_magn_z_raw_thresh_falling_value

/sys/.../events/in_rot_from_north_magnetic_raw_thresh_rising_value

/sys/.../events/in_rot_from_north_magnetic_raw_thresh_falling_value

/sys/.../events/in_rot_from_north_true_raw_thresh_rising_value

/sys/.../events/in_rot_from_north_true_raw_thresh_falling_value

/sys/.../events/in_rot_from_north_magnetic_tilt_comp_raw_thresh_rising_value

/sys/.../events/in_rot_from_north_magnetic_tilt_comp_raw_thresh_falling_value

/sys/.../events/in_rot_from_north_true_tilt_comp_raw_thresh_rising_value

/sys/.../events/in_rot_from_north_true_tilt_comp_raw_thresh_falling_value

/sys/.../events/in_voltageY_supply_raw_thresh_rising_value

/sys/.../events/in_voltageY_supply_raw_thresh_falling_value

/sys/.../events/in_voltageY_raw_thresh_rising_value

/sys/.../events/in_voltageY_raw_thresh_falling_value

/sys/.../events/in_tempY_raw_thresh_rising_value

/sys/.../events/in_tempY_raw_thresh_falling_value

/sys/.../events/in_illuminance0_thresh_falling_value

/sys/.../events/in_illuminance0_thresh_rising_value

/sys/.../events/in_proximity0_thresh_falling_value

/sys/.../events/in_proximity0_thresh_rising_value

/sys/.../events/in_illuminance_thresh_rising_value

/sys/.../events/in_illuminance_thresh_falling_value

/sys/.../events/in_capacitanceY_thresh_rising_value

/sys/.../events/in_capacitanceY_thresh_falling_value

/sys/.../events/in_capacitanceY_thresh_adaptive_rising_value

/sys/.../events/in_capacitanceY_thresh_falling_rising_value

Defined on file sysfs-bus-iio

Specifies the value of threshold that the device is comparing against for the events enabled by <type>Y[_name]_thresh[_rising|falling]_en.

If separate attributes exist for the two directions, but direction is not specified for this attribute, then a single threshold value applies to both directions.

The raw or input element of the name indicates whether the value is in raw device units or in processed units (as _raw and _input do on sysfs direct channel read attributes).

/sys/.../events/in_accel_x_raw_roc_rising_value

/sys/.../events/in_accel_x_raw_roc_falling_value

/sys/.../events/in_accel_y_raw_roc_rising_value

/sys/.../events/in_accel_y_raw_roc_falling_value

/sys/.../events/in_accel_z_raw_roc_rising_value

/sys/.../events/in_accel_z_raw_roc_falling_value

/sys/.../events/in_anglvel_x_raw_roc_rising_value

/sys/.../events/in_anglvel_x_raw_roc_falling_value

/sys/.../events/in_anglvel_y_raw_roc_rising_value

/sys/.../events/in_anglvel_y_raw_roc_falling_value

/sys/.../events/in_anglvel_z_raw_roc_rising_value

/sys/.../events/in_anglvel_z_raw_roc_falling_value

/sys/.../events/in_magn_x_raw_roc_rising_value

/sys/.../events/in_magn_x_raw_roc_falling_value

/sys/.../events/in_magn_y_raw_roc_rising_value

/sys/.../events/in_magn_y_raw_roc_falling_value

/sys/.../events/in_magn_z_raw_roc_rising_value

/sys/.../events/in_magn_z_raw_roc_falling_value

/sys/.../events/in_rot_from_north_magnetic_raw_roc_rising_value

/sys/.../events/in_rot_from_north_magnetic_raw_roc_falling_value

/sys/.../events/in_rot_from_north_true_raw_roc_rising_value

/sys/.../events/in_rot_from_north_true_raw_roc_falling_value

/sys/.../events/in_rot_from_north_magnetic_tilt_comp_raw_roc_rising_value

/sys/.../events/in_rot_from_north_magnetic_tilt_comp_raw_roc_falling_value

/sys/.../events/in_rot_from_north_true_tilt_comp_raw_roc_rising_value

/sys/.../events/in_rot_from_north_true_tilt_comp_raw_roc_falling_value

/sys/.../events/in_voltageY_supply_raw_roc_rising_value

/sys/.../events/in_voltageY_supply_raw_roc_falling_value

/sys/.../events/in_voltageY_raw_roc_rising_value

/sys/.../events/in_voltageY_raw_roc_falling_value

/sys/.../events/in_tempY_raw_roc_rising_value

/sys/.../events/in_tempY_raw_roc_falling_value

Defined on file sysfs-bus-iio

Specifies the value of rate of change threshold that the device is comparing against for the events enabled by <type>[Y][_name]_roc[_rising|falling]_en.

If separate attributes exist for the two directions, but direction is not specified for this attribute, then a single threshold value applies to both directions. The raw or input element of the name indicates whether the value is in raw device units or in processed units (as _raw and _input do on sysfs direct channel read attributes).

/sys/.../events/in_accel_x_thresh_rising_hysteresis

/sys/.../events/in_accel_x_thresh_falling_hysteresis

/sys/.../events/in_accel_x_thresh_either_hysteresis

/sys/.../events/in_accel_y_thresh_rising_hysteresis

/sys/.../events/in_accel_y_thresh_falling_hysteresis

/sys/.../events/in_accel_y_thresh_either_hysteresis

/sys/.../events/in_accel_z_thresh_rising_hysteresis

/sys/.../events/in_accel_z_thresh_falling_hysteresis

/sys/.../events/in_accel_z_thresh_either_hysteresis

/sys/.../events/in_anglvel_x_thresh_rising_hysteresis

/sys/.../events/in_anglvel_x_thresh_falling_hysteresis

/sys/.../events/in_anglvel_x_thresh_either_hysteresis

/sys/.../events/in_anglvel_y_thresh_rising_hysteresis

/sys/.../events/in_anglvel_y_thresh_falling_hysteresis

/sys/.../events/in_anglvel_y_thresh_either_hysteresis

/sys/.../events/in_anglvel_z_thresh_rising_hysteresis

/sys/.../events/in_anglvel_z_thresh_falling_hysteresis

/sys/.../events/in_anglvel_z_thresh_either_hysteresis

/sys/.../events/in_magn_x_thresh_rising_hysteresis

/sys/.../events/in_magn_x_thresh_falling_hysteresis

/sys/.../events/in_magn_x_thresh_either_hysteresis

/sys/.../events/in_magn_y_thresh_rising_hysteresis

/sys/.../events/in_magn_y_thresh_falling_hysteresis

/sys/.../events/in_magn_y_thresh_either_hysteresis

/sys/.../events/in_magn_z_thresh_rising_hysteresis

/sys/.../events/in_magn_z_thresh_falling_hysteresis

/sys/.../events/in_magn_z_thresh_either_hysteresis

/sys/.../events/in_rot_from_north_magnetic_thresh_rising_hysteresis

/sys/.../events/in_rot_from_north_magnetic_thresh_falling_hysteresis

/sys/.../events/in_rot_from_north_magnetic_thresh_either_hysteresis

/sys/.../events/in_rot_from_north_true_thresh_rising_hysteresis

/sys/.../events/in_rot_from_north_true_thresh_falling_hysteresis

/sys/.../events/in_rot_from_north_true_thresh_either_hysteresis

/sys/.../events/in_rot_from_north_magnetic_tilt_comp_thresh_rising_hysteresis

/sys/.../events/in_rot_from_north_magnetic_tilt_comp_thresh_falling_hysteresis

/sys/.../events/in_rot_from_north_magnetic_tilt_comp_thresh_either_hysteresis

/sys/.../events/in_rot_from_north_true_tilt_comp_thresh_rising_hysteresis

/sys/.../events/in_rot_from_north_true_tilt_comp_thresh_falling_hysteresis

/sys/.../events/in_rot_from_north_true_tilt_comp_thresh_either_hysteresis

/sys/.../events/in_voltageY_thresh_rising_hysteresis

/sys/.../events/in_voltageY_thresh_falling_hysteresis

/sys/.../events/in_voltageY_thresh_either_hysteresis

/sys/.../events/in_tempY_thresh_rising_hysteresis

/sys/.../events/in_tempY_thresh_falling_hysteresis

/sys/.../events/in_tempY_thresh_either_hysteresis

/sys/.../events/in_illuminance0_thresh_falling_hysteresis

/sys/.../events/in_illuminance0_thresh_rising_hysteresis

/sys/.../events/in_illuminance0_thresh_either_hysteresis

/sys/.../events/in_proximity0_thresh_falling_hysteresis

/sys/.../events/in_proximity0_thresh_rising_hysteresis

/sys/.../events/in_proximity0_thresh_either_hysteresis

Defined on file sysfs-bus-iio

Specifies the hysteresis of threshold that the device is comparing against for the events enabled by <type>Y[_name]_thresh[_(rising|falling)]_hysteresis. If separate attributes exist for the two directions, but direction is not specified for this attribute, then a single hysteresis value applies to both directions.

For falling events the hysteresis is added to the _value attribute for this event to get the upper threshold for when the event goes back to normal, for rising events the hysteresis is subtracted from the _value attribute. E.g. if in_voltage0_raw_thresh_rising_value is set to 1200 and in_voltage0_raw_thresh_rising_hysteresis is set to 50. The event will get activated once in_voltage0_raw goes above 1200 and will become deactivated again once the value falls below 1150.

/sys/.../events/in_accel_x_thresh_rising_period

/sys/.../events/in_accel_x_thresh_falling_period

/sys/.../events/in_accel_x_roc_rising_period

/sys/.../events/in_accel_x_roc_falling_period

/sys/.../events/in_accel_y_thresh_rising_period

/sys/.../events/in_accel_y_thresh_falling_period

/sys/.../events/in_accel_y_roc_rising_period

/sys/.../events/in_accel_y_roc_falling_period

/sys/.../events/in_accel_z_thresh_rising_period

/sys/.../events/in_accel_z_thresh_falling_period

/sys/.../events/in_accel_z_roc_rising_period

/sys/.../events/in_accel_z_roc_falling_period

/sys/.../events/in_anglvel_x_thresh_rising_period

/sys/.../events/in_anglvel_x_thresh_falling_period

/sys/.../events/in_anglvel_x_roc_rising_period

/sys/.../events/in_anglvel_x_roc_falling_period

/sys/.../events/in_anglvel_y_thresh_rising_period

/sys/.../events/in_anglvel_y_thresh_falling_period

/sys/.../events/in_anglvel_y_roc_rising_period

/sys/.../events/in_anglvel_y_roc_falling_period

/sys/.../events/in_anglvel_z_thresh_rising_period

/sys/.../events/in_anglvel_z_thresh_falling_period

/sys/.../events/in_anglvel_z_roc_rising_period

/sys/.../events/in_anglvel_z_roc_falling_period

/sys/.../events/in_magn_x_thresh_rising_period

/sys/.../events/in_magn_x_thresh_falling_period

/sys/.../events/in_magn_x_roc_rising_period

/sys/.../events/in_magn_x_roc_falling_period

/sys/.../events/in_magn_y_thresh_rising_period

/sys/.../events/in_magn_y_thresh_falling_period

/sys/.../events/in_magn_y_roc_rising_period

/sys/.../events/in_magn_y_roc_falling_period

/sys/.../events/in_magn_z_thresh_rising_period

/sys/.../events/in_magn_z_thresh_falling_period

/sys/.../events/in_magn_z_roc_rising_period

/sys/.../events/in_magn_z_roc_falling_period

/sys/.../events/in_rot_from_north_magnetic_thresh_rising_period

/sys/.../events/in_rot_from_north_magnetic_thresh_falling_period

/sys/.../events/in_rot_from_north_magnetic_roc_rising_period

/sys/.../events/in_rot_from_north_magnetic_roc_falling_period

/sys/.../events/in_rot_from_north_true_thresh_rising_period

/sys/.../events/in_rot_from_north_true_thresh_falling_period

/sys/.../events/in_rot_from_north_true_roc_rising_period

/sys/.../events/in_rot_from_north_true_roc_falling_period

/sys/.../events/in_rot_from_north_magnetic_tilt_comp_thresh_rising_period

/sys/.../events/in_rot_from_north_magnetic_tilt_comp_thresh_falling_period

/sys/.../events/in_rot_from_north_magnetic_tilt_comp_roc_rising_period

/sys/.../events/in_rot_from_north_magnetic_tilt_comp_roc_falling_period

/sys/.../events/in_rot_from_north_true_tilt_comp_thresh_rising_period

/sys/.../events/in_rot_from_north_true_tilt_comp_thresh_falling_period

/sys/.../events/in_rot_from_north_true_tilt_comp_roc_rising_period

/sys/.../events/in_rot_from_north_true_tilt_comp_roc_falling_period

/sys/.../events/in_voltageY_supply_thresh_rising_period

/sys/.../events/in_voltageY_supply_thresh_falling_period

/sys/.../events/in_voltageY_supply_roc_rising_period

/sys/.../events/in_voltageY_supply_roc_falling_period

/sys/.../events/in_voltageY_thresh_rising_period

/sys/.../events/in_voltageY_thresh_falling_period

/sys/.../events/in_voltageY_roc_rising_period

/sys/.../events/in_voltageY_roc_falling_period

/sys/.../events/in_tempY_thresh_rising_period

/sys/.../events/in_tempY_thresh_falling_period

/sys/.../events/in_tempY_roc_rising_period

/sys/.../events/in_tempY_roc_falling_period

/sys/.../events/in_accel_x&y&z_mag_falling_period

/sys/.../events/in_intensity0_thresh_period

/sys/.../events/in_proximity0_thresh_period

/sys/.../events/in_activity_still_thresh_rising_period

/sys/.../events/in_activity_still_thresh_falling_period

/sys/.../events/in_activity_walking_thresh_rising_period

/sys/.../events/in_activity_walking_thresh_falling_period

/sys/.../events/in_activity_jogging_thresh_rising_period

/sys/.../events/in_activity_jogging_thresh_falling_period

/sys/.../events/in_activity_running_thresh_rising_period

/sys/.../events/in_activity_running_thresh_falling_period

/sys/.../events/in_illuminance_thresh_either_period

Defined on file sysfs-bus-iio

Period of time (in seconds) for which the condition must be met before an event is generated. If direction is not specified then this period applies to both directions.

/sys/.../events/in_activity_still_thresh_rising_en

/sys/.../events/in_activity_still_thresh_falling_en

/sys/.../events/in_activity_walking_thresh_rising_en

/sys/.../events/in_activity_walking_thresh_falling_en

/sys/.../events/in_activity_jogging_thresh_rising_en

/sys/.../events/in_activity_jogging_thresh_falling_en

/sys/.../events/in_activity_running_thresh_rising_en

/sys/.../events/in_activity_running_thresh_falling_en

Defined on file sysfs-bus-iio

Enables or disables activity events. Depending on direction an event is generated when sensor ENTERS or LEAVES a given state.

/sys/.../events/in_activity_still_thresh_rising_value

/sys/.../events/in_activity_still_thresh_falling_value

/sys/.../events/in_activity_walking_thresh_rising_value

/sys/.../events/in_activity_walking_thresh_falling_value

/sys/.../events/in_activity_jogging_thresh_rising_value

/sys/.../events/in_activity_jogging_thresh_falling_value

/sys/.../events/in_activity_running_thresh_rising_value

/sys/.../events/in_activity_running_thresh_falling_value

Defined on file sysfs-bus-iio

Confidence value (in units as percentage) to be used for deciding when an event should be generated. E.g for running: If the confidence value reported by the sensor is greater than in_activity_running_thresh_rising_value then the sensor ENTERS running state. Conversely, if the confidence value reported by the sensor is lower than in_activity_running_thresh_falling_value then the sensor is LEAVING running state.

/sys/.../events/in_capacitanceY_adaptive_thresh_rising_en

/sys/.../events/in_capacitanceY_adaptive_thresh_falling_en

Defined on file sysfs-bus-iio

Adaptive thresholds are similar to normal fixed thresholds but the value is expressed as an offset from a value which provides a low frequency approximation of the channel itself. Thus these detect if a rapid change occurs in the specified direction which crosses tracking value + offset. Tracking value calculation is devices specific.

/sys/.../events/in_illuminance0_threshY_hysteresis

Defined on file sysfs-bus-iio-light-lm3533-als

Get the hysteresis for thresholds Y, that is, threshY_hysteresis = threshY_raising - threshY_falling

/sys/.../events/in_illuminance0_thresh_either_en

Defined on file sysfs-bus-iio-light-lm3533-als

Event generated when channel passes one of the four thresholds in each direction (rising|falling) and a zone change occurs. The corresponding light zone can be read from in_illuminance0_zone.

/sys/.../events/in_proximity_thresh_either_runningcount

Defined on file sysfs-bus-iio

Number of conditions that must occur, during a running period, before an event is generated.

/sys/.../events/in_proximity_thresh_either_runningperiod

Defined on file sysfs-bus-iio

A running period of time (in seconds) for which in_proximity_thresh_either_runningcount amount of conditions must occur before an event is generated. If direction is not specified then this period applies to both directions.

/sys/.../events/in_steps_change_en

Defined on file sysfs-bus-iio

Event generated when channel passes a threshold on the absolute change in value. E.g. for steps: a step change event is generated each time the user takes N steps, where N is set using in_steps_change_value.

/sys/.../events/in_steps_change_value

Defined on file sysfs-bus-iio

Specifies the value of change threshold that the device is comparing against for the events enabled by <type>[Y][_name]_roc[_rising|falling|]_en. E.g. for steps: if set to 3, a step change event will be generated every 3 steps.

/sys/.../iio:deviceX/bufferY/in_accel_type

/sys/.../iio:deviceX/bufferY/in_deltaangl_type

/sys/.../iio:deviceX/bufferY/in_deltavelocity_type

/sys/.../iio:deviceX/bufferY/in_anglvel_type

/sys/.../iio:deviceX/bufferY/in_magn_type

/sys/.../iio:deviceX/bufferY/in_incli_type

/sys/.../iio:deviceX/bufferY/in_voltageY_type

/sys/.../iio:deviceX/bufferY/in_voltage_type

/sys/.../iio:deviceX/bufferY/in_voltageY_supply_type

/sys/.../iio:deviceX/bufferY/in_voltageY_i_type

/sys/.../iio:deviceX/bufferY/in_voltageY_q_type

/sys/.../iio:deviceX/bufferY/in_voltage_i_type

/sys/.../iio:deviceX/bufferY/in_voltage_q_type

/sys/.../iio:deviceX/bufferY/in_timestamp_type

/sys/.../iio:deviceX/bufferY/in_pressureY_type

/sys/.../iio:deviceX/bufferY/in_pressure_type

/sys/.../iio:deviceX/bufferY/in_rot_quaternion_type

/sys/.../iio:deviceX/bufferY/in_proximity_type

Defined on file sysfs-bus-iio

Description of the scan element data storage within the buffer and hence the form in which it is read from user-space. Form is [be|le]:[s|u]bits/storagebits[>>shift]. be or le specifies big or little endian. s or u specifies if signed (2’s complement) or unsigned. bits is the number of bits of data and storagebits is the space (after padding) that it occupies in the buffer. shift if specified, is the shift that needs to be applied prior to masking out unused bits. Some devices put their data in the middle of the transferred elements with additional information on both sides. Note that some devices will have additional information in the unused bits so to get a clean value, the bits value must be used to mask the buffer output value appropriately. The storagebits value also specifies the data alignment. So s48/64>>2 will be a signed 48 bit integer stored in a 64 bit location aligned to a 64 bit boundary. To obtain the clean value, shift right 2 and apply a mask to zero the top 16 bits of the result. For other storage combinations this attribute will be extended appropriately.

/sys/.../iio:deviceX/bufferY/in_accel_x_en

/sys/.../iio:deviceX/bufferY/in_accel_y_en

/sys/.../iio:deviceX/bufferY/in_accel_z_en

/sys/.../iio:deviceX/bufferY/in_deltaangl_x_en

/sys/.../iio:deviceX/bufferY/in_deltaangl_y_en

/sys/.../iio:deviceX/bufferY/in_deltaangl_z_en

/sys/.../iio:deviceX/bufferY/in_deltavelocity_x_en

/sys/.../iio:deviceX/bufferY/in_deltavelocity_y_en

/sys/.../iio:deviceX/bufferY/in_deltavelocity_z_en

/sys/.../iio:deviceX/bufferY/in_anglvel_x_en

/sys/.../iio:deviceX/bufferY/in_anglvel_y_en

/sys/.../iio:deviceX/bufferY/in_anglvel_z_en

/sys/.../iio:deviceX/bufferY/in_magn_x_en

/sys/.../iio:deviceX/bufferY/in_magn_y_en

/sys/.../iio:deviceX/bufferY/in_magn_z_en

/sys/.../iio:deviceX/bufferY/in_rot_from_north_magnetic_en

/sys/.../iio:deviceX/bufferY/in_rot_from_north_true_en

/sys/.../iio:deviceX/bufferY/in_rot_from_north_magnetic_tilt_comp_en

/sys/.../iio:deviceX/bufferY/in_rot_from_north_true_tilt_comp_en

/sys/.../iio:deviceX/bufferY/in_timestamp_en

/sys/.../iio:deviceX/bufferY/in_voltageY_supply_en

/sys/.../iio:deviceX/bufferY/in_voltageY_en

/sys/.../iio:deviceX/bufferY/in_voltageY-voltageZ_en

/sys/.../iio:deviceX/bufferY/in_voltageY_i_en

/sys/.../iio:deviceX/bufferY/in_voltageY_q_en

/sys/.../iio:deviceX/bufferY/in_voltage_i_en

/sys/.../iio:deviceX/bufferY/in_voltage_q_en

/sys/.../iio:deviceX/bufferY/in_incli_x_en

/sys/.../iio:deviceX/bufferY/in_incli_y_en

/sys/.../iio:deviceX/bufferY/in_pressureY_en

/sys/.../iio:deviceX/bufferY/in_pressure_en

/sys/.../iio:deviceX/bufferY/in_rot_quaternion_en

/sys/.../iio:deviceX/bufferY/in_proximity_en

Defined on file sysfs-bus-iio

Scan element control for triggered data capture.

/sys/.../iio:deviceX/bufferY/in_voltageY_index

/sys/.../iio:deviceX/bufferY/in_voltageY_supply_index

/sys/.../iio:deviceX/bufferY/in_voltageY_i_index

/sys/.../iio:deviceX/bufferY/in_voltageY_q_index

/sys/.../iio:deviceX/bufferY/in_voltage_i_index

/sys/.../iio:deviceX/bufferY/in_voltage_q_index

/sys/.../iio:deviceX/bufferY/in_accel_x_index

/sys/.../iio:deviceX/bufferY/in_accel_y_index

/sys/.../iio:deviceX/bufferY/in_accel_z_index

/sys/.../iio:deviceX/bufferY/in_deltaangl_x_index

/sys/.../iio:deviceX/bufferY/in_deltaangl_y_index

/sys/.../iio:deviceX/bufferY/in_deltaangl_z_index

/sys/.../iio:deviceX/bufferY/in_deltavelocity_x_index

/sys/.../iio:deviceX/bufferY/in_deltavelocity_y_index

/sys/.../iio:deviceX/bufferY/in_deltavelocity_z_index

/sys/.../iio:deviceX/bufferY/in_anglvel_x_index

/sys/.../iio:deviceX/bufferY/in_anglvel_y_index

/sys/.../iio:deviceX/bufferY/in_anglvel_z_index

/sys/.../iio:deviceX/bufferY/in_magn_x_index

/sys/.../iio:deviceX/bufferY/in_magn_y_index

/sys/.../iio:deviceX/bufferY/in_magn_z_index

/sys/.../iio:deviceX/bufferY/in_rot_from_north_magnetic_index

/sys/.../iio:deviceX/bufferY/in_rot_from_north_true_index

/sys/.../iio:deviceX/bufferY/in_rot_from_north_magnetic_tilt_comp_index

/sys/.../iio:deviceX/bufferY/in_rot_from_north_true_tilt_comp_index

/sys/.../iio:deviceX/bufferY/in_incli_x_index

/sys/.../iio:deviceX/bufferY/in_incli_y_index

/sys/.../iio:deviceX/bufferY/in_timestamp_index

/sys/.../iio:deviceX/bufferY/in_pressureY_index

/sys/.../iio:deviceX/bufferY/in_pressure_index

/sys/.../iio:deviceX/bufferY/in_rot_quaternion_index

/sys/.../iio:deviceX/bufferY/in_proximity_index

Defined on file sysfs-bus-iio

A single positive integer specifying the position of this scan element in the buffer. Note these are not dependent on what is enabled and may not be contiguous. Thus for user-space to establish the full layout these must be used in conjunction with all _en attributes to establish which channels are present, and the relevant _type attributes to establish the data storage format.

/sys/.../iio:deviceX/events/in_accel_mag_en

/sys/.../iio:deviceX/events/in_accel_mag_rising_en

/sys/.../iio:deviceX/events/in_accel_mag_falling_en

/sys/.../iio:deviceX/events/in_accel_x_mag_en

/sys/.../iio:deviceX/events/in_accel_x_mag_rising_en

/sys/.../iio:deviceX/events/in_accel_x_mag_falling_en

/sys/.../iio:deviceX/events/in_accel_y_mag_en

/sys/.../iio:deviceX/events/in_accel_y_mag_rising_en

/sys/.../iio:deviceX/events/in_accel_y_mag_falling_en

/sys/.../iio:deviceX/events/in_accel_z_mag_en

/sys/.../iio:deviceX/events/in_accel_z_mag_rising_en

/sys/.../iio:deviceX/events/in_accel_z_mag_falling_en

/sys/.../iio:deviceX/events/in_accel_x&y&z_mag_rising_en

/sys/.../iio:deviceX/events/in_accel_x&y&z_mag_falling_en

Defined on file sysfs-bus-iio

Similar to in_accel_x_thresh[_rising|_falling]_en, but here the magnitude of the channel is compared to the threshold, not its signed value.

/sys/.../iio:deviceX/events/in_accel_mag_referenced_en

/sys/.../iio:deviceX/events/in_accel_mag_referenced_rising_en

/sys/.../iio:deviceX/events/in_accel_mag_referenced_falling_en

/sys/.../iio:deviceX/events/in_accel_y_mag_referenced_en

/sys/.../iio:deviceX/events/in_accel_y_mag_referenced_rising_en

/sys/.../iio:deviceX/events/in_accel_y_mag_referenced_falling_en

Defined on file sysfs-bus-iio

Similar to in_accel_mag[_y][_rising|_falling]_en, but the event value is relative to a reference magnitude. The reference magnitude includes the graviational acceleration.

/sys/.../iio:deviceX/events/in_accel_mag_referenced_value

/sys/.../iio:deviceX/events/in_accel_mag_referenced_rising_value

/sys/.../iio:deviceX/events/in_accel_mag_referenced_falling_value

/sys/.../iio:deviceX/events/in_accel_y_mag_referenced_value

/sys/.../iio:deviceX/events/in_accel_y_mag_referenced_rising_value

/sys/.../iio:deviceX/events/in_accel_y_mag_referenced_falling_value

Defined on file sysfs-bus-iio

The value to which the reference magnitude of the channel is compared. If the axis is not specified, it applies to all channels of this type.

/sys/.../iio:deviceX/events/in_accel_x_roc_rising_en

/sys/.../iio:deviceX/events/in_accel_x_roc_falling_en

/sys/.../iio:deviceX/events/in_accel_y_roc_rising_en

/sys/.../iio:deviceX/events/in_accel_y_roc_falling_en

/sys/.../iio:deviceX/events/in_accel_z_roc_rising_en

/sys/.../iio:deviceX/events/in_accel_z_roc_falling_en

/sys/.../iio:deviceX/events/in_anglvel_x_roc_rising_en

/sys/.../iio:deviceX/events/in_anglvel_x_roc_falling_en

/sys/.../iio:deviceX/events/in_anglvel_y_roc_rising_en

/sys/.../iio:deviceX/events/in_anglvel_y_roc_falling_en

/sys/.../iio:deviceX/events/in_anglvel_z_roc_rising_en

/sys/.../iio:deviceX/events/in_anglvel_z_roc_falling_en

/sys/.../iio:deviceX/events/in_magn_x_roc_rising_en

/sys/.../iio:deviceX/events/in_magn_x_roc_falling_en

/sys/.../iio:deviceX/events/in_magn_y_roc_rising_en

/sys/.../iio:deviceX/events/in_magn_y_roc_falling_en

/sys/.../iio:deviceX/events/in_magn_z_roc_rising_en

/sys/.../iio:deviceX/events/in_magn_z_roc_falling_en

/sys/.../iio:deviceX/events/in_rot_from_north_magnetic_roc_rising_en

/sys/.../iio:deviceX/events/in_rot_from_north_magnetic_roc_falling_en

/sys/.../iio:deviceX/events/in_rot_from_north_true_roc_rising_en

/sys/.../iio:deviceX/events/in_rot_from_north_true_roc_falling_en

/sys/.../iio:deviceX/events/in_rot_from_north_magnetic_tilt_comp_roc_rising_en

/sys/.../iio:deviceX/events/in_rot_from_north_magnetic_tilt_comp_roc_falling_en

/sys/.../iio:deviceX/events/in_rot_from_north_true_tilt_comp_roc_rising_en

/sys/.../iio:deviceX/events/in_rot_from_north_true_tilt_comp_roc_falling_en

/sys/.../iio:deviceX/events/in_voltageY_supply_roc_rising_en

/sys/.../iio:deviceX/events/in_voltageY_supply_roc_falling_en

/sys/.../iio:deviceX/events/in_voltageY_roc_rising_en

/sys/.../iio:deviceX/events/in_voltageY_roc_falling_en

/sys/.../iio:deviceX/events/in_tempY_roc_rising_en

/sys/.../iio:deviceX/events/in_tempY_roc_falling_en

Defined on file sysfs-bus-iio

Event generated when channel passes a threshold on the rate of change (1st differential) in the specified (_rising|_falling) direction. If the direction is not specified, then either the device will report an event which ever direction a single threshold value is passed in (e.g. <type>[Y][_name]_<raw|input>_roc_value) or <type>[Y][_name]_<raw|input>_roc_rising_value and <type>[Y][_name]_<raw|input>_roc_falling_value may take different values, but the device can only enable both rate of change thresholds or neither.

Note the driver will assume the last p events requested are to be enabled where p is however many it supports (which may vary depending on the exact set requested. So if you want to be sure you have set what you think you have, check the contents of these attributes after everything is configured. Drivers may have to buffer any parameters so that they are consistent when a given event type is enabled a future point (and not those for whatever event was previously enabled).

/sys/.../iio:deviceX/events/in_accel_x_thresh_rising_en

/sys/.../iio:deviceX/events/in_accel_x_thresh_falling_en

/sys/.../iio:deviceX/events/in_accel_y_thresh_rising_en

/sys/.../iio:deviceX/events/in_accel_y_thresh_falling_en

/sys/.../iio:deviceX/events/in_accel_z_thresh_rising_en

/sys/.../iio:deviceX/events/in_accel_z_thresh_falling_en

/sys/.../iio:deviceX/events/in_anglvel_x_thresh_rising_en

/sys/.../iio:deviceX/events/in_anglvel_x_thresh_falling_en

/sys/.../iio:deviceX/events/in_anglvel_y_thresh_rising_en

/sys/.../iio:deviceX/events/in_anglvel_y_thresh_falling_en

/sys/.../iio:deviceX/events/in_anglvel_z_thresh_rising_en

/sys/.../iio:deviceX/events/in_anglvel_z_thresh_falling_en

/sys/.../iio:deviceX/events/in_magn_x_thresh_rising_en

/sys/.../iio:deviceX/events/in_magn_x_thresh_falling_en

/sys/.../iio:deviceX/events/in_magn_y_thresh_rising_en

/sys/.../iio:deviceX/events/in_magn_y_thresh_falling_en

/sys/.../iio:deviceX/events/in_magn_z_thresh_rising_en

/sys/.../iio:deviceX/events/in_magn_z_thresh_falling_en

/sys/.../iio:deviceX/events/in_rot_from_north_magnetic_thresh_rising_en

/sys/.../iio:deviceX/events/in_rot_from_north_magnetic_thresh_falling_en

/sys/.../iio:deviceX/events/in_rot_from_north_true_thresh_rising_en

/sys/.../iio:deviceX/events/in_rot_from_north_true_thresh_falling_en

/sys/.../iio:deviceX/events/in_rot_from_north_magnetic_tilt_comp_thresh_rising_en

/sys/.../iio:deviceX/events/in_rot_from_north_magnetic_tilt_comp_thresh_falling_en

/sys/.../iio:deviceX/events/in_rot_from_north_true_tilt_comp_thresh_rising_en

/sys/.../iio:deviceX/events/in_rot_from_north_true_tilt_comp_thresh_falling_en

/sys/.../iio:deviceX/events/in_voltageY_supply_thresh_rising_en

/sys/.../iio:deviceX/events/in_voltageY_supply_thresh_falling_en

/sys/.../iio:deviceX/events/in_voltageY_thresh_rising_en

/sys/.../iio:deviceX/events/in_voltageY_thresh_falling_en

/sys/.../iio:deviceX/events/in_voltageY_thresh_either_en

/sys/.../iio:deviceX/events/in_tempY_thresh_rising_en

/sys/.../iio:deviceX/events/in_tempY_thresh_falling_en

/sys/.../iio:deviceX/events/in_capacitanceY_thresh_rising_en

/sys/.../iio:deviceX/events/in_capacitanceY_thresh_falling_en

Defined on file sysfs-bus-iio

Event generated when channel passes a threshold in the specified (_rising|_falling) direction. If the direction is not specified, then either the device will report an event which ever direction a single threshold value is passed in (e.g. <type>[Y][_name]_<raw|input>_thresh_value) or <type>[Y][_name]_<raw|input>_thresh_rising_value and <type>[Y][_name]_<raw|input>_thresh_falling_value may take different values, but the device can only enable both thresholds or neither.

Note the driver will assume the last p events requested are to be enabled where p is how many it supports (which may vary depending on the exact set requested. So if you want to be sure you have set what you think you have, check the contents of these attributes after everything is configured. Drivers may have to buffer any parameters so that they are consistent when a given event type is enabled at a future point (and not those for whatever event was previously enabled).

/sys/.../iio:deviceX/in_accelX_power_mode

Defined on file sysfs-bus-iio

Specifies the chip power mode. low_noise: reduce noise level from ADC, low_power: enable low current consumption. For a list of available output power modes read in_accel_power_mode_available.

/sys/.../iio:deviceX/in_activity_still_input

/sys/.../iio:deviceX/in_activity_walking_input

/sys/.../iio:deviceX/in_activity_jogging_input

/sys/.../iio:deviceX/in_activity_running_input

Defined on file sysfs-bus-iio

This attribute is used to read the confidence for an activity expressed in units as percentage.

/sys/.../iio:deviceX/in_anglvel_z_quadrature_correction_raw

Defined on file sysfs-bus-iio

This attribute is used to read the amount of quadrature error present in the device at a given time.

/sys/.../iio:deviceX/in_capacitableY_calibbias_calibration

/sys/.../iio:deviceX/in_capacitableY_calibscale_calibration

Defined on file sysfs-bus-iio-cdc-ad7746

Write 1 to trigger a calibration of the calibbias or calibscale. For calibscale, a full scale capacitance should be connected to the capacitance input and a calibscale_calibration then started. For calibbias see the device datasheet section on “capacitive system offset calibration”.

/sys/.../iio:deviceX/in_capacitanceY-capacitanceZ_raw

Defined on file sysfs-bus-iio

Raw differential capacitance measurement equivalent to channel Y - channel Z where these channel numbers apply to the physically equivalent inputs when non differential readings are separately available. In differential only parts, then all that is required is a consistent labeling. Units after application of scale and offset are nanofarads.

/sys/.../iio:deviceX/in_capacitanceY-capacitanceZ_zeropoint

Defined on file sysfs-bus-iio

For differential channels, this an offset that is applied equally to both inputs. As the reading is of the difference between the two inputs, this should not be applied to the _raw reading by userspace (unlike _offset) and unlike calibbias it does not affect the differential value measured because the effect of _zeropoint cancels out across the two inputs that make up the differential pair. It’s purpose is to bring the individual signals, before the differential is measured, within the measurement range of the device. The naming is chosen because if the separate inputs that make the differential pair are drawn on a graph in their _raw units, this is the value that the zero point on the measurement axis represents. It is expressed with the same scaling as _raw.

/sys/.../iio:deviceX/in_distance_input

/sys/.../iio:deviceX/in_distance_raw

Defined on file sysfs-bus-iio

This attribute is used to read the measured distance to an object or the distance covered by the user since the last reboot while activated. Units after application of scale are meters.

/sys/.../iio:deviceX/in_energy_en

/sys/.../iio:deviceX/in_distance_en

/sys/.../iio:deviceX/in_velocity_sqrt(x^2+y^2+z^2)_en

/sys/.../iio:deviceX/in_steps_en

Defined on file sysfs-bus-iio

Activates a device feature that runs in firmware/hardware. E.g. for steps: the pedometer saves power while not used; when activated, it will count the steps taken by the user in firmware and export them through in_steps_input.

/sys/.../iio:deviceX/in_energy_input

/sys/.../iio:deviceX/in_energy_raw

Defined on file sysfs-bus-iio

This attribute is used to read the energy value reported by the device (e.g.: human activity sensors report energy burnt by the user). Units after application of scale are Joules.

/sys/.../iio:deviceX/in_illuminance_input

/sys/.../iio:deviceX/in_illuminance_raw

/sys/.../iio:deviceX/in_illuminanceY_input

/sys/.../iio:deviceX/in_illuminanceY_raw

/sys/.../iio:deviceX/in_illuminanceY_mean_raw

/sys/.../iio:deviceX/in_illuminance_ir_raw

/sys/.../iio:deviceX/in_illuminance_clear_raw

Defined on file sysfs-bus-iio

Illuminance measurement, units after application of scale and offset are lux.

/sys/.../iio:deviceX/in_intensityY_raw

/sys/.../iio:deviceX/in_intensityY_ir_raw

/sys/.../iio:deviceX/in_intensityY_both_raw

/sys/.../iio:deviceX/in_intensityY_uv_raw

/sys/.../iio:deviceX/in_intensityY_uva_raw

/sys/.../iio:deviceX/in_intensityY_uvb_raw

/sys/.../iio:deviceX/in_intensityY_duv_raw

Defined on file sysfs-bus-iio

Unit-less light intensity. Modifiers both and ir indicate that measurements contain visible and infrared light components or just infrared light, respectively. Modifier uv indicates that measurements contain ultraviolet light components. Modifiers uva, uvb and duv indicate that measurements contain A, B or deep (C) ultraviolet light components respectively.

/sys/.../iio:deviceX/in_intensity_integration_time

/sys/.../iio:deviceX/in_intensity_red_integration_time

/sys/.../iio:deviceX/in_intensity_green_integration_time

/sys/.../iio:deviceX/in_intensity_blue_integration_time

/sys/.../iio:deviceX/in_intensity_clear_integration_time

/sys/.../iio:deviceX/in_illuminance_integration_time

Defined on file sysfs-bus-iio

This attribute is used to get/set the integration time in seconds. If shared across all channels of a given type, <type>_integration_time is used.

/sys/.../iio:deviceX/in_proximity_raw

/sys/.../iio:deviceX/in_proximity_input

/sys/.../iio:deviceX/in_proximityY_raw

Defined on file sysfs-bus-iio

Proximity measurement indicating that some object is near the sensor, usually by observing reflectivity of infrared or ultrasound emitted.

Often these sensors are unit less and as such conversion to SI units is not possible. Higher proximity measurements indicate closer objects, and vice versa. Units after application of scale and offset are meters.

/sys/.../iio:deviceX/in_steps_debounce_count

Defined on file sysfs-bus-iio

Specifies the number of steps that must occur within in_steps_filter_debounce_time for the pedometer to decide the consumer is making steps.

/sys/.../iio:deviceX/in_steps_debounce_time

Defined on file sysfs-bus-iio

Specifies number of seconds in which we compute the steps that occur in order to decide if the consumer is making steps.

/sys/.../iio:deviceX/in_steps_input

Defined on file sysfs-bus-iio

This attribute is used to read the number of steps taken by the user since the last reboot while activated.

/sys/.../iio:deviceX/in_uvindex_input

Defined on file sysfs-bus-iio

UV light intensity index measuring the human skin’s response to different wavelength of sunlight weighted according to the standardised CIE Erythemal Action Spectrum. UV index values range from 0 (low) to >=11 (extreme).

/sys/.../iio:deviceX/in_velocity_sqrt(x^2+y^2+z^2)_input

/sys/.../iio:deviceX/in_velocity_sqrt(x^2+y^2+z^2)_raw

Defined on file sysfs-bus-iio

This attribute is used to read the current speed value of the user (which is the norm or magnitude of the velocity vector). Units after application of scale are m/s.

/sys/.../iio:deviceX/in_velocity_sqrt(x^2+y^2+z^2)_integration_time

Defined on file sysfs-bus-iio

Number of seconds in which to compute speed.

/sys/.../iio:deviceX/out_voltageY_powerdown_mode_available

/sys/.../iio:deviceX/out_voltage_powerdown_mode_available

/sys/.../iio:deviceX/out_altvoltageY_powerdown_mode_available

/sys/.../iio:deviceX/out_altvoltage_powerdown_mode_available

Defined on file sysfs-bus-iio

Lists all available output power down modes. If Y is not present the mode is shared across all outputs.

/sys/.../iio:deviceX/scan_elements/in_accel_type_available

Defined on file sysfs-bus-iio

If the type parameter can take one of a small set of values, this attribute lists them.

/sys/.../in_accel_filter_high_pass_3db_frequency

/sys/.../in_anglvel_filter_high_pass_3db_frequency

/sys/.../in_magn_filter_high_pass_3db_frequency

Defined on file sysfs-bus-iio

If a known or controllable high pass filter is applied to the underlying data channel, then this parameter gives the 3dB frequency of the filter in Hz.

/sys/.../in_accel_filter_low_pass_3db_frequency

/sys/.../in_magn_filter_low_pass_3db_frequency

/sys/.../in_anglvel_filter_low_pass_3db_frequency

Defined on file sysfs-bus-iio

If a known or controllable low pass filter is applied to the underlying data channel, then this parameter gives the 3dB frequency of the filter in Hz.

/sys/.../in_capacitanceY_adaptive_thresh_rising_timeout

/sys/.../in_capacitanceY_adaptive_thresh_falling_timeout

Defined on file sysfs-bus-iio

When adaptive thresholds are used, the tracking signal may adjust too slowly to step changes in the raw signal. Thus these specify the time in seconds for which the difference between the slow tracking signal and the raw signal is allowed to remain out-of-range before a reset event occurs in which the tracking signal is made equal to the raw signal, allowing slow tracking to resume and the adaptive threshold event detection to function as expected.

/sys/.../mdev_supported_types/<type-id>/available_instances

Defined on file sysfs-bus-vfio-mdev

Reading this attribute will show the number of mediated devices of type <type-id> that can be created. This is a readonly file.

Users:

Userspace applications interested in creating mediated device of that type. Userspace application should check the number of available instances could be created before creating mediated device of this type.

/sys/.../mdev_supported_types/<type-id>/create

Defined on file sysfs-bus-vfio-mdev

Writing UUID to this file will create mediated device of type <type-id> for parent device <device>. This is a write-only file. For example:

# echo "83b8f4f2-509f-382f-3c1e-e6bfe0fa1001" >       \
     /sys/devices/foo/mdev_supported_types/foo-1/create

/sys/.../mdev_supported_types/<type-id>/description

Defined on file sysfs-bus-vfio-mdev

Reading this attribute will show description of the type of mediated device that will get created of type <type-id>. This is optional attribute. For example: “2 heads, 512M FB, 2560x1600 maximum resolution”

Users:

Userspace applications interested in knowing the details of a particular <type-id> that can help in understanding the features provided by that type of mediated device.

/sys/.../mdev_supported_types/<type-id>/device_api

Defined on file sysfs-bus-vfio-mdev

Reading this attribute will show VFIO device API supported by this type. For example, “vfio-pci” for a PCI device, “vfio-platform” for platform device.

/sys/.../mdev_supported_types/<type-id>/devices/

Defined on file sysfs-bus-vfio-mdev

This directory contains symbolic links pointing to mdev devices sysfs entries which are created of this <type-id>.

/sys/.../mdev_supported_types/<type-id>/name

Defined on file sysfs-bus-vfio-mdev

Reading this attribute will show human readable name of the mediated device that will get created of type <type-id>. This is optional attribute. For example: “Grid M60-0Q”

Users:

Userspace applications interested in knowing the name of a particular <type-id> that can help in understanding the type of mediated device.

/sys/.../uevent

Defined on file sysfs-uevent

Enable passing additional variables for synthetic uevents that are generated by writing /sys/.../uevent file.

Recognized extended format is:

ACTION [UUID [KEY=VALUE ...]

The ACTION is compulsory - it is the name of the uevent action (add, change, remove). There is no change compared to previous functionality here. The rest of the extended format is optional.

You need to pass UUID first before any KEY=VALUE pairs. The UUID must be in xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx format where ‘x’ is a hex digit. The UUID is considered to be a transaction identifier so it’s possible to use the same UUID value for one or more synthetic uevents in which case we logically group these uevents together for any userspace listeners. The UUID value appears in uevent as SYNTH_UUID=xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx environment variable.

If UUID is not passed in, the generated synthetic uevent gains SYNTH_UUID=0 environment variable automatically.

The KEY=VALUE pairs can contain alphanumeric characters only.

It’s possible to define zero or more pairs - each pair is then delimited by a space character ‘ ‘. Each pair appears in synthetic uevent as SYNTH_ARG_KEY=VALUE. That means the KEY name gains SYNTH_ARG_ prefix to avoid possible collisions with existing variables.

Example of valid sequence written to the uevent file:

add fe4d7c9d-b8c6-4a70-9ef1-3d8a58d18eed A=1 B=abc

This generates synthetic uevent including these variables:

ACTION=add
SYNTH_ARG_A=1
SYNTH_ARG_B=abc
SYNTH_UUID=fe4d7c9d-b8c6-4a70-9ef1-3d8a58d18eed

Users:

udev, userspace tools generating synthetic uevents

Symbols under /sys/block

/sys/block/*/device/cdl_enable

Defined on file sysfs-block-device

(RW) For a device supporting the command duration limits feature, write to the file to turn on or off the feature. By default this feature is turned off. Writing “1” to this file enables the use of command duration limits for read and write commands in the kernel and turns on the feature on the device. Writing “0” disables the feature.

/sys/block/*/device/cdl_supported

Defined on file sysfs-block-device

(RO) Indicates if the device supports the command duration limits feature found in some ATA and SCSI devices.

/sys/block/*/device/ncq_prio_enable

Defined on file sysfs-block-device

(RW) Write to the file to turn on or off the SATA NCQ (native command queueing) priority support. By default this feature is turned off. If the device does not support the SATA NCQ priority feature, writing “1” to this file results in an error (see ncq_prio_supported).

/sys/block/*/device/ncq_prio_supported

Defined on file sysfs-block-device

(RO) Indicates if the device supports the SATA NCQ (native command queueing) priority feature.

/sys/block/*/device/sas_ncq_prio_enable

Defined on file sysfs-block-device

(RW) This is the equivalent of the ncq_prio_enable attribute file for SATA devices connected to a SAS host-bus-adapter (HBA) implementing support for the SATA NCQ priority feature. This file does not exist if the HBA driver does not implement support for the SATA NCQ priority feature, regardless of the device support for this feature (see sas_ncq_prio_supported).

/sys/block/*/device/sas_ncq_prio_supported

Defined on file sysfs-block-device

(RO) This is the equivalent of the ncq_prio_supported attribute file for SATA devices connected to a SAS host-bus-adapter (HBA) implementing support for the SATA NCQ priority feature. This file does not exist if the HBA driver does not implement support for the SATA NCQ priority feature, regardless of the device support for this feature.

/sys/block/*/device/sw_activity

Defined on file sysfs-block-device

(RW) Used by drivers which support software controlled activity LEDs.

It has the following valid values:

0

OFF - the LED is not activated on activity

1

BLINK_ON - the LED blinks on every 10ms when activity is detected.

2

BLINK_OFF - the LED is on when idle, and blinks off every 10ms when activity is detected.

Note that the user must turn sw_activity OFF it they wish to control the activity LED via the em_message file.

/sys/block/*/device/unload_heads

Defined on file sysfs-block-device

(RW) Hard disk shock protection

Writing an integer value to this file will take the heads of the respective drive off the platter and block all I/O operations for the specified number of milliseconds.

  • If the device does not support the unload heads feature, access is denied with -EOPNOTSUPP.

  • The maximal value accepted for a timeout is 30000 milliseconds.

  • A previously set timeout can be cancelled and disk can resume normal operation immediately by specifying a timeout of 0.

  • Some hard drives only comply with an earlier version of the ATA standard, but support the unload feature nonetheless. There is no safe way Linux can detect these devices, so this is not enabled by default. If it is known that your device does support the unload feature, then you can tell the kernel to enable it by writing -1. It can be disabled again by writing -2.

  • Values below -2 are rejected with -EINVAL

For more information, see Hard disk shock protection

/sys/block/<device>/iosched/target_latency

Defined on file sysfs-cfq-target-latency

The /sys/block/<device>/iosched/target_latency only exists when the user sets cfq to /sys/block/<device>/scheduler. It contains an estimated latency time for the cfq. cfq will use it to calculate the time slice used for every task.

/sys/block/<disk>/bcache/btree_cache_size

Defined on file sysfs-block-bcache

Number of btree buckets/nodes that are currently cached in memory; cache dynamically grows and shrinks in response to memory pressure from the rest of the system.

/sys/block/<disk>/bcache/btree_written

Defined on file sysfs-block-bcache

For a cache, sum of all btree writes in human readable units.

/sys/block/<disk>/bcache/bucket_size

Defined on file sysfs-block-bcache

For a cache, bucket size in human readable units, as set at cache creation time; should match the erase block size of the SSD for optimal performance.

/sys/block/<disk>/bcache/bypassed

Defined on file sysfs-block-bcache

Sum of all reads and writes that have bypassed the cache (due to the sequential cutoff). Expressed as bytes in human readable units.

/sys/block/<disk>/bcache/cache

Defined on file sysfs-block-bcache

For a backing device that has cache, a symlink to the bcache/ dir of that cache.

/sys/block/<disk>/bcache/cache_hit_ratio

Defined on file sysfs-block-bcache

For backing devices: cache hits as a percentage.

/sys/block/<disk>/bcache/cache_hits

Defined on file sysfs-block-bcache

For backing devices: integer number of full cache hits, counted per bio. A partial cache hit counts as a miss.

/sys/block/<disk>/bcache/cache_misses

Defined on file sysfs-block-bcache

For backing devices: integer number of cache misses.

/sys/block/<disk>/bcache/clear_stats

Defined on file sysfs-block-bcache

Writing to this file resets all the statistics for the device.

/sys/block/<disk>/bcache/discard

Defined on file sysfs-block-bcache

For a cache, a boolean allowing discard/TRIM to be turned off or back on if the device supports it.

/sys/block/<disk>/bcache/nbuckets

Defined on file sysfs-block-bcache

For a cache, the number of usable buckets.

/sys/block/<disk>/bcache/sequential_cutoff

Defined on file sysfs-block-bcache

For backing devices: Threshold past which sequential IO will skip the cache. Read and written as bytes in human readable units (i.e. echo 10M > sequntial_cutoff).

/sys/block/<disk>/bcache/synchronous

Defined on file sysfs-block-bcache

For a cache, a boolean that allows synchronous mode to be switched on and off. In synchronous mode all writes are ordered such that the cache can reliably recover from unclean shutdown; if disabled bcache will not generally wait for writes to complete but if the cache is not shut down cleanly all data will be discarded from the cache. Should not be turned off with writeback caching enabled.

/sys/block/<disk>/bcache/tree_depth

Defined on file sysfs-block-bcache

For a cache, height of the btree excluding leaf nodes (i.e. a one node tree will have a depth of 0).

/sys/block/<disk>/bcache/unregister

Defined on file sysfs-block-bcache

A write to this file causes the backing device or cache to be unregistered. If a backing device had dirty data in the cache, writeback mode is automatically disabled and all dirty data is flushed before the device is unregistered. Caches unregister all associated backing devices before unregistering themselves.

/sys/block/<disk>/bcache/writeback

Defined on file sysfs-block-bcache

For backing devices: When on, writeback caching is enabled and writes will be buffered in the cache. When off, caching is in writethrough mode; reads and writes will be added to the cache but no write buffering will take place.

/sys/block/<disk>/bcache/writeback_delay

Defined on file sysfs-block-bcache

For backing devices: In writeback mode, when dirty data is written to the cache and the cache held no dirty data for that backing device, writeback from cache to backing device starts after this delay, expressed as an integer number of seconds.

/sys/block/<disk>/bcache/writeback_percent

Defined on file sysfs-block-bcache

For backing devices: If nonzero, writeback from cache to backing device only takes place when more than this percentage of the cache is used, allowing more write coalescing to take place and reducing total number of writes sent to the backing device. Integer between 0 and 40.

/sys/block/<disk>/bcache/writeback_running

Defined on file sysfs-block-bcache

For backing devices: when off, dirty data will not be written from the cache to the backing device. The cache will still be used to buffer writes until it is mostly full, at which point writes transparently revert to writethrough mode. Intended only for benchmarking/testing.

/sys/block/<disk>/bcache/written

Defined on file sysfs-block-bcache

For a cache, total amount of data in human readable units written to the cache, excluding all metadata.

/sys/block/dm-<num>/dm/name

Defined on file sysfs-block-dm

Device-mapper device name. Read-only string containing mapped device name.

Users: util-linux, device-mapper udev rules

/sys/block/dm-<num>/dm/rq_based_seq_io_merge_deadline

Defined on file sysfs-block-dm

Allow control over how long a request that is a reasonable merge candidate can be queued on the request queue. The resolution of this deadline is in microseconds (ranging from 1 to 100000 usecs). Setting this attribute to 0 (the default) will disable request-based DM’s merge heuristic and associated extra accounting. This attribute is not applicable to bio-based DM devices so it will only ever report 0 for them.

/sys/block/dm-<num>/dm/suspended

Defined on file sysfs-block-dm

Device-mapper device suspend state. Contains the value 1 while the device is suspended. Otherwise it contains 0. Read-only attribute.

Users: util-linux, device-mapper udev rules

/sys/block/dm-<num>/dm/use_blk_mq

Defined on file sysfs-block-dm

Request-based Device-mapper blk-mq I/O path mode. Contains the value 1 if the device is using blk-mq. Otherwise it contains 0. Read-only attribute.

/sys/block/dm-<num>/dm/uuid

Defined on file sysfs-block-dm

Device-mapper device UUID. Read-only string containing DM-UUID or empty string if DM-UUID is not set.

Users: util-linux, device-mapper udev rules

/sys/block/etherd*/firmware-version

Defined on file sysfs-block-aoe

(RO) Version of the firmware in the target.

/sys/block/etherd*/mac

Defined on file sysfs-block-aoe

(RO) The ethernet address of the remote Ata over Ethernet (AoE) device.

/sys/block/etherd*/netif

Defined on file sysfs-block-aoe

(RO) The names of the network interfaces on the localhost (comma separated) through which we are communicating with the remote AoE device.

/sys/block/etherd*/payload

Defined on file sysfs-block-aoe

(RO) The amount of user data transferred (in bytes) inside each AoE command on the network, network headers excluded.

/sys/block/etherd*/state

Defined on file sysfs-block-aoe

(RO) Device status. The state attribute is “up” when the device is ready for I/O and “down” if detected but unusable. The “down,closewait” state shows that the device is still open and cannot come up again until it has been closed. The “up,kickme” state means that the driver wants to send more commands to the target but found out there were already the max number of commands waiting for a response. It will retry again after being kicked by the periodic timer handler routine.

/sys/block/loopX/loop/autoclear

Defined on file sysfs-block-loop

(RO) Shows if the device is in autoclear mode or not ( “1” or “0”). Autoclear (if set) indicates that the loopback device will self-distruct after last close.

/sys/block/loopX/loop/backing_file

Defined on file sysfs-block-loop

(RO) The path of the backing file that the loop device maps its data blocks to.

/sys/block/loopX/loop/dio

Defined on file sysfs-block-loop

(RO) Shows if direct IO is being used to access backing file or not (“1 or “0”).

/sys/block/loopX/loop/offset

Defined on file sysfs-block-loop

(RO) Start offset (in bytes).

/sys/block/loopX/loop/partscan

Defined on file sysfs-block-loop

(RO) Shows if automatic partition scanning is enabled for the device or not (“1” or “0”). This can be requested individually per loop device during its setup by setting LO_FLAGS_PARTSCAN in in the ioctl request. By default, no partition tables are scanned.

/sys/block/loopX/loop/sizelimit

Defined on file sysfs-block-loop

(RO) The size (in bytes) that the block device maps, starting from the offset.

/sys/block/rnbd<N>/rnbd/access_mode

Defined on file sysfs-block-rnbd

Contains the device access mode: ro, rw or migration.

/sys/block/rnbd<N>/rnbd/mapping_path

Defined on file sysfs-block-rnbd

Contains the path that was passed as “device_path” to the map_device operation.

/sys/block/rnbd<N>/rnbd/nr_poll_queues

Defined on file sysfs-block-rnbd

Contains the number of poll-mode queues

/sys/block/rnbd<N>/rnbd/remap_device

Defined on file sysfs-block-rnbd

Remap the disconnected device if the session is not destroyed yet.

/sys/block/rnbd<N>/rnbd/resize

Defined on file sysfs-block-rnbd

Write the number of sectors to change the size of the disk.

/sys/block/rnbd<N>/rnbd/session

Defined on file sysfs-block-rnbd

RNBD uses RTRS session to transport the data between client and server. The entry “session” contains the name of the session, that was used to establish the RTRS session. It’s the same name that was passed as server parameter to the map_device entry.

/sys/block/rnbd<N>/rnbd/state

Defined on file sysfs-block-rnbd

The file contains the current state of the block device. The state file returns “open” when the device is successfully mapped from the server and accepting I/O requests. When the connection to the server gets disconnected in case of an error (e.g. link failure), the state file returns “closed” and all I/O requests submitted to it will fail with -EIO.

/sys/block/rnbd<N>/rnbd/unmap_device

Defined on file sysfs-block-rnbd

To unmap a volume, “normal” or “force” has to be written to: /sys/block/rnbd<N>/rnbd/unmap_device

When “normal” is used, the operation will fail with EBUSY if any process is using the device. When “force” is used, the device is also unmapped when device is in use. All I/Os that are in progress will fail.

Example:

# echo "normal" > /sys/block/rnbd0/rnbd/unmap_device

/sys/block/rssd*/status

Defined on file sysfs-block-rssd

This is a read-only file. Indicates the status of the device.

/sys/block/zram<id>/backing_dev

Defined on file sysfs-block-zram

The backing_dev file is read-write and set up backing device for zram to write incompressible pages. For using, user should enable CONFIG_ZRAM_WRITEBACK.

/sys/block/zram<id>/bd_stat

Defined on file sysfs-block-zram

The bd_stat file is read-only and represents backing device’s statistics (bd_count, bd_reads, bd_writes) in a format similar to block layer statistics file format.

/sys/block/zram<id>/comp_algorithm

Defined on file sysfs-block-zram

The comp_algorithm file is read-write and lets to show available and selected compression algorithms, change compression algorithm selection.

/sys/block/zram<id>/compact

Defined on file sysfs-block-zram

The compact file is write-only and trigger compaction for allocator zrm uses. The allocator moves some objects so that it could free fragment space.

/sys/block/zram<id>/debug_stat

Defined on file sysfs-block-zram

The debug_stat file is read-only and represents various device’s debugging info useful for kernel developers. Its format is not documented intentionally and may change anytime without any notice.

/sys/block/zram<id>/disksize

Defined on file sysfs-block-zram

The disksize file is read-write and specifies the disk size which represents the limit on the uncompressed worth of data that can be stored in this disk. Unit: bytes

/sys/block/zram<id>/idle

Defined on file sysfs-block-zram

idle file is write-only and mark zram slot as idle. If system has mounted debugfs, user can see which slots are idle via /sys/kernel/debug/zram/zram<id>/block_state

/sys/block/zram<id>/initstate

Defined on file sysfs-block-zram

The initstate file is read-only and shows the initialization state of the device.

/sys/block/zram<id>/io_stat

Defined on file sysfs-block-zram

The io_stat file is read-only and accumulates device’s I/O statistics not accounted by block layer. For example, failed_reads, failed_writes, etc. File format is similar to block layer statistics file format.

/sys/block/zram<id>/max_comp_streams

Defined on file sysfs-block-zram

The max_comp_streams file is read-write and specifies the number of backend’s zcomp_strm compression streams (number of concurrent compress operations).

/sys/block/zram<id>/mem_limit

Defined on file sysfs-block-zram

The mem_limit file is write-only and specifies the maximum amount of memory ZRAM can use to store the compressed data. The limit could be changed in run time and “0” means disable the limit. No limit is the initial state. Unit: bytes

/sys/block/zram<id>/mem_used_max

Defined on file sysfs-block-zram

The mem_used_max file is write-only and is used to reset the counter of maximum memory zram have consumed to store compressed data. For resetting the value, you should write “0”. Otherwise, you could see -EINVAL. Unit: bytes

/sys/block/zram<id>/mm_stat

Defined on file sysfs-block-zram

The mm_stat file is read-only and represents device’s mm statistics (orig_data_size, compr_data_size, etc.) in a format similar to block layer statistics file format.

/sys/block/zram<id>/recomp_algorithm

Defined on file sysfs-block-zram

The recomp_algorithm file is read-write and allows to set or show secondary compression algorithms.

/sys/block/zram<id>/recompress

Defined on file sysfs-block-zram

The recompress file is write-only and triggers re-compression with secondary compression algorithms.

/sys/block/zram<id>/reset

Defined on file sysfs-block-zram

The reset file is write-only and allows resetting the device. The reset operation frees all the memory associated with this device.

/sys/block/zram<id>/writeback

Defined on file sysfs-block-zram

The writeback file is write-only and trigger idle and/or huge page writeback to backing device.

/sys/block/zram<id>/writeback_limit

Defined on file sysfs-block-zram

The writeback_limit file is read-write and specifies the maximum amount of writeback ZRAM can do. The limit could be changed in run time.

/sys/block/zram<id>/writeback_limit_enable

Defined on file sysfs-block-zram

The writeback_limit_enable file is read-write and specifies eanbe of writeback_limit feature. “1” means eable the feature. No limit “0” is the initial state.

Symbols under /sys/bus

/sys/bus/*/drivers/ufshcd/*/auto_hibern8

Defined on file sysfs-driver-ufs

This file contains the auto-hibernate idle timer setting of a UFS host controller. A value of ‘0’ means auto-hibernate is not enabled. Otherwise the value is the number of microseconds of idle time before the UFS host controller will autonomously put the link into hibernate state. That will save power at the expense of increased latency. Note that the hardware supports 10-bit values with a power-of-ten multiplier which allows a maximum value of 102300000. Refer to the UFS Host Controller Interface specification for more details.

/sys/bus/.../drivers/intel-m10-bmc/.../bmc_version

Defined on file sysfs-driver-intel-m10-bmc

Read only. Returns the hardware build version of Intel MAX10 BMC chip. Format: “0x%x”.

/sys/bus/.../drivers/intel-m10-bmc/.../bmcfw_version

Defined on file sysfs-driver-intel-m10-bmc

Read only. Returns the firmware version of Intel MAX10 BMC chip. Format: “0x%x”.

/sys/bus/.../drivers/intel-m10-bmc/.../mac_address

Defined on file sysfs-driver-intel-m10-bmc

Read only. Returns the first MAC address in a block of sequential MAC addresses assigned to the board that is managed by the Intel MAX10 BMC. It is stored in FLASH storage and is mirrored in the MAX10 BMC register space. Format: “%02x:%02x:%02x:%02x:%02x:%02x”.

/sys/bus/.../drivers/intel-m10-bmc/.../mac_count

Defined on file sysfs-driver-intel-m10-bmc

Read only. Returns the number of sequential MAC addresses assigned to the board managed by the Intel MAX10 BMC. This value is stored in FLASH and is mirrored in the MAX10 BMC register space. Format: “%u”.

/sys/bus/acpi/devices/.../adr

Defined on file sysfs-bus-acpi

This attribute contains the output of the device object’s _ADR control method, which is present for ACPI device objects representing devices having standard enumeration algorithms, such as PCI.

/sys/bus/acpi/devices/.../description

Defined on file sysfs-bus-acpi

This attribute contains the output of the device object’s _STR control method, if present.

/sys/bus/acpi/devices/.../eject

Defined on file sysfs-bus-acpi

Writing 1 to this attribute will trigger hot removal of this device object. This file exists for every device object that has _EJ0 method.

/sys/bus/acpi/devices/.../hid

Defined on file sysfs-bus-acpi

This attribute indicates the hardware ID (_HID) of the device object. For example, PNP0103. This file is present for device objects having the _HID control method.

/sys/bus/acpi/devices/.../hrv

Defined on file sysfs-bus-acpi

(RO) Allows users to read the hardware version of non-PCI hardware, if the _HRV control method is present. It is mostly useful for non-PCI devices because lspci can list the hardware version for PCI devices.

/sys/bus/acpi/devices/.../modalias

Defined on file sysfs-bus-acpi

This attribute indicates the PNP IDs of the device object. That is acpi:HHHHHHHH:[CCCCCCC:]. Where each HHHHHHHH or CCCCCCCC contains device object’s PNPID (_HID or _CID).

/sys/bus/acpi/devices/.../path

Defined on file sysfs-bus-acpi

This attribute indicates the full path of ACPI namespace object associated with the device object. For example, _SB_.PCI0.

This file is not present for device objects representing fixed ACPI hardware features (like power and sleep buttons).

/sys/bus/acpi/devices/.../status

Defined on file sysfs-bus-acpi

(RO) Returns the ACPI device status: enabled, disabled or functioning or present, if the method _STA is present.

The return value is a decimal integer representing the device’s status bitmap:

Bit [0]

Set if the device is present.

Bit [1]

Set if the device is enabled and decoding its resources.

Bit [2]

Set if the device should be shown in the UI.

Bit [3]

Set if the device is functioning properly (cleared if device failed its diagnostics).

Bit [4]

Set if the battery is present.

Bits [31:5]

Reserved (must be cleared)

If bit [0] is clear, then bit 1 must also be clear (a device that is not present cannot be enabled).

Bit 0 can be clear (not present) with bit [3] set (device is functional). This case is used to indicate a valid device for which no device driver should be loaded.

More special cases are covered in the ACPI specification.

/sys/bus/acpi/devices/.../uid

Defined on file sysfs-bus-acpi

This attribute contains the output of the device object’s _UID control method, if present.

/sys/bus/acpi/intel-rapid-start/wakeup_events

Defined on file sysfs-driver-intel-rapid-start

An integer representing a set of wakeup events as follows: 1: Wake to enter hibernation when the wakeup timer expires 2: Wake to enter hibernation when the battery reaches a critical level

These values are ORed together. For example, a value of 3 indicates that the system will wake to enter hibernation when either the wakeup timer expires or the battery reaches a critical level.

/sys/bus/acpi/intel-rapid-start/wakeup_time

Defined on file sysfs-driver-intel-rapid-start

An integer representing the length of time the system will remain asleep before waking up to enter hibernation. This value is in minutes.

/sys/bus/amba/devices/.../driver_override

Defined on file sysfs-bus-amba

This file allows the driver for a device to be specified which will override standard OF, ACPI, ID table, and name matching. When specified, only a driver with a name matching the value written to driver_override will have an opportunity to bind to the device. The override is specified by writing a string to the driver_override file (echo vfio-amba > driver_override) and may be cleared with an empty string (echo > driver_override). This returns the device to standard matching rules binding. Writing to driver_override does not automatically unbind the device from its current driver or make any attempt to automatically load the specified driver. If no driver with a matching name is currently loaded in the kernel, the device will not bind to any driver. This also allows devices to opt-out of driver binding using a driver_override name such as “none”. Only a single driver may be specified in the override, there is no support for parsing delimiters.

/sys/bus/auxiliary/devices/.../irqs/

Defined on file sysfs-bus-auxiliary

The /sys/devices/.../irqs directory contains a variable set of files, with each file is named as irq number similar to PCI PF or VF’s irq number located in msi_irqs directory. These irq files are added and removed dynamically when an IRQ is requested and freed respectively for the PCI SF.

/sys/bus/auxiliary/devices/intel_vsec.sdsi.X

Defined on file sysfs-driver-intel_sdsi

This directory contains interface files for accessing Intel On Demand (formerly Software Defined Silicon or SDSi) features on a CPU. X represents the socket instance (though not the socket ID). The socket ID is determined by reading the registers file and decoding it per the specification.

Some files communicate with On Demand hardware through a mailbox. Should the operation fail, one of the following error codes may be returned:

Error Code

Cause

EIO

General mailbox failure. Log may indicate cause.

EBUSY

Mailbox is owned by another agent.

EPERM

On Demand capability is not enabled in hardware.

EPROTO

Failure in mailbox protocol detected by driver. See log for details.

EOVERFLOW

For provision commands, the size of the data exceeds what may be written.

ESPIPE

Seeking is not allowed.

ETIMEDOUT

Failure to complete mailbox transaction in time.

/sys/bus/auxiliary/devices/intel_vsec.sdsi.X/guid

Defined on file sysfs-driver-intel_sdsi

(RO) The GUID for the registers file. The GUID identifies the layout of the registers file in this directory. Information about the register layouts for a particular GUID is available at http://github.com/intel/intel-sdsi

/sys/bus/auxiliary/devices/intel_vsec.sdsi.X/meter_certificate

Defined on file sysfs-driver-intel_sdsi

(RO) Used to read back the current meter certificate for the CPU from Intel On Demand hardware. The meter certificate contains utilization metrics of On Demand enabled features. Mailbox command.

/sys/bus/auxiliary/devices/intel_vsec.sdsi.X/provision_akc

Defined on file sysfs-driver-intel_sdsi

(WO) Used to write an Authentication Key Certificate (AKC) to the On Demand NVRAM for the CPU. The AKC is used to authenticate a Capability Activation Payload. Mailbox command.

/sys/bus/auxiliary/devices/intel_vsec.sdsi.X/provision_cap

Defined on file sysfs-driver-intel_sdsi

(WO) Used to write a Capability Activation Payload (CAP) to the On Demand NVRAM for the CPU. CAPs are used to activate a given CPU feature. A CAP is validated by On Demand hardware using a previously provisioned AKC file. Upon successful authentication, the CPU configuration is updated. A cold reboot is required to fully activate the feature. Mailbox command.

/sys/bus/auxiliary/devices/intel_vsec.sdsi.X/registers

Defined on file sysfs-driver-intel_sdsi

(RO) Contains information needed by applications to provision a CPU and monitor status information. The layout of this file is determined by the GUID in this directory. Information about the layout for a particular GUID is available at http://github.com/intel/intel-sdsi

/sys/bus/auxiliary/devices/intel_vsec.sdsi.X/state_certificate

Defined on file sysfs-driver-intel_sdsi

(RO) Used to read back the current state certificate for the CPU from On Demand hardware. The state certificate contains information about the current licenses on the CPU. Mailbox command.

/sys/bus/bcma/devices/.../class

Defined on file sysfs-bus-bcma

Each BCMA core is identified by few fields, including class it belongs to. See include/linux/bcma/bcma.h for possible values.

/sys/bus/bcma/devices/.../id

Defined on file sysfs-bus-bcma

There are a few types of BCMA cores, they can be identified by id field.

/sys/bus/bcma/devices/.../manuf

Defined on file sysfs-bus-bcma

Each BCMA core has its manufacturer id. See include/linux/bcma/bcma.h for possible values.

/sys/bus/bcma/devices/.../rev

Defined on file sysfs-bus-bcma

BCMA cores of the same type can still slightly differ depending on their revision. Use it for detailed programming.

/sys/bus/cdx/devices/.../class

Defined on file sysfs-bus-cdx

This file contains the class of the CDX device, in hexadecimal. Class is 24 bit identifier specifies the functionality of the device.

/sys/bus/cdx/devices/.../device

Defined on file sysfs-bus-cdx

Device ID for this CDX device, in hexadecimal. Device ID is 16 bit identifier to identify a device type within the range of a device manufacturer. Combination of Vendor ID and Device ID identifies a device.

/sys/bus/cdx/devices/.../enable

Defined on file sysfs-bus-cdx

CDX bus should be disabled before updating the devices in FPGA. Writing n/0/off will attempt to disable the CDX bus and. writing y/1/on will attempt to enable the CDX bus. Reading this file gives the current state of the bus, 1 for enabled and 0 for disabled.

For example:

# echo 1 > /sys/bus/cdx/.../enable

/sys/bus/cdx/devices/.../modalias

Defined on file sysfs-bus-cdx

This attribute indicates the CDX ID of the device. That is in the format: cdx:vXXXXdXXXXsvXXXXsdXXXXcXXXXXX, where:

  • vXXXX contains the vendor ID;

  • dXXXX contains the device ID;

  • svXXXX contains the subsystem vendor ID;

  • sdXXXX contains the subsystem device ID;

  • cXXXXXX contains the device class.

/sys/bus/cdx/devices/.../remove

Defined on file sysfs-bus-cdx

Writing y/1/on to this file removes the corresponding device from the CDX bus. If the device is to be reconfigured reconfigured in the Hardware, the device can be removed, so that the device driver does not access the device while it is being reconfigured.

For example:

# echo 1 > /sys/bus/cdx/devices/.../remove

/sys/bus/cdx/devices/.../reset

Defined on file sysfs-bus-cdx

Writing y/1/on to this file resets the CDX device or all devices on the bus. On resetting the device, the corresponding driver is notified twice, once before the device is being reset, and again after the reset has been complete.

For example:

# echo 1 > /sys/bus/cdx/.../reset

/sys/bus/cdx/devices/.../resource<N>

Defined on file sysfs-bus-cdx

The resource binary file contains the content of the memory regions. These files can be m’maped from userspace.

/sys/bus/cdx/devices/.../revision

Defined on file sysfs-bus-cdx

This file contains the revision field of the CDX device, in hexadecimal. Revision is 8 bit revision identifier of the device.

/sys/bus/cdx/devices/.../subsystem_device

Defined on file sysfs-bus-cdx

Subsystem Device ID for this CDX device, in hexadecimal Subsystem Device ID is 16 bit identifier specific to the card manufacturer.

/sys/bus/cdx/devices/.../subsystem_vendor

Defined on file sysfs-bus-cdx

Subsystem Vendor ID for this CDX device, in hexadecimal. Subsystem Vendor ID is 16 bit identifier specific to the card manufacturer.

/sys/bus/cdx/devices/.../vendor

Defined on file sysfs-bus-cdx

Vendor ID for this CDX device, in hexadecimal. Vendor ID is 16 bit identifier which is specific to the device manufacturer. Combination of Vendor ID and Device ID identifies a device.

/sys/bus/cdx/rescan

Defined on file sysfs-bus-cdx

Writing y/1/on to this file will cause rescan of the bus and devices on the CDX bus. Any new devices are scanned and added to the list of Linux devices and any devices removed are also deleted from Linux.

For example:

# echo 1 > /sys/bus/cdx/rescan

/sys/bus/coreboot

Defined on file sysfs-bus-coreboot

The coreboot bus provides a variety of virtual devices used to access data structures created by the Coreboot BIOS.

/sys/bus/coreboot/devices/cbmem-<id>

Defined on file sysfs-bus-coreboot

CBMEM is a downwards-growing memory region created by Coreboot, and contains tagged data structures to be shared with payloads in the boot process and the OS. Each CBMEM entry is given a directory in /sys/bus/coreboot/devices based on its id. A list of ids known to Coreboot can be found in the coreboot source tree at src/commonlib/bsd/include/commonlib/bsd/cbmem_id.h.

/sys/bus/coreboot/devices/cbmem-<id>/address

Defined on file sysfs-bus-coreboot

This is the physical memory address that the CBMEM entry’s data begins at, in hexadecimal (e.g., 0x76ffe000).

/sys/bus/coreboot/devices/cbmem-<id>/mem

Defined on file sysfs-bus-coreboot

A file exposing read/write access to the entry’s data. Note that this file does not support mmap(), as coreboot does not guarantee that the data will be page-aligned.

The mode of this file is 0600. While there shouldn’t be anything security-sensitive contained in CBMEM, read access requires root privileges given this is exposing a small subset of physical memory.

/sys/bus/coreboot/devices/cbmem-<id>/size

Defined on file sysfs-bus-coreboot

This is the size of the CBMEM entry’s data, in hexadecimal (e.g., 0x1234).

/sys/bus/coresight/devices/<cti-name>/channels/chan_clear

Defined on file sysfs-bus-coresight-devices-cti

(Write) Deactivate a single channel.

/sys/bus/coresight/devices/<cti-name>/channels/chan_free

Defined on file sysfs-bus-coresight-devices-cti

(Read) show channels with no attached trigger signals.

/sys/bus/coresight/devices/<cti-name>/channels/chan_gate_disable

Defined on file sysfs-bus-coresight-devices-cti

(Write) Disable CTIGATE for single channel.

/sys/bus/coresight/devices/<cti-name>/channels/chan_gate_enable

Defined on file sysfs-bus-coresight-devices-cti

(RW) Enable CTIGATE for single channel (Write) or list enabled channels through the gate (R).

/sys/bus/coresight/devices/<cti-name>/channels/chan_inuse

Defined on file sysfs-bus-coresight-devices-cti

(Read) show channels with at least one attached trigger signal.

/sys/bus/coresight/devices/<cti-name>/channels/chan_pulse

Defined on file sysfs-bus-coresight-devices-cti

(Write) Pulse a single channel - activate for a single clock cycle.

/sys/bus/coresight/devices/<cti-name>/channels/chan_set

Defined on file sysfs-bus-coresight-devices-cti

(Write) Activate a single channel.

/sys/bus/coresight/devices/<cti-name>/channels/chan_xtrigs_in

Defined on file sysfs-bus-coresight-devices-cti

(Read) Read to see input triggers connected to selected view channel.

/sys/bus/coresight/devices/<cti-name>/channels/chan_xtrigs_out

Defined on file sysfs-bus-coresight-devices-cti

(Read) Read to see output triggers connected to selected view channel.

/sys/bus/coresight/devices/<cti-name>/channels/chan_xtrigs_reset

Defined on file sysfs-bus-coresight-devices-cti

(Write) Clear all channel / trigger programming.

/sys/bus/coresight/devices/<cti-name>/channels/chan_xtrigs_sel

Defined on file sysfs-bus-coresight-devices-cti

(RW) Write channel number to select a channel to view, read to see selected channel number.

/sys/bus/coresight/devices/<cti-name>/channels/trig_filter_enable

Defined on file sysfs-bus-coresight-devices-cti

(RW) Enable or disable trigger output signal filtering.

/sys/bus/coresight/devices/<cti-name>/channels/trigin_attach

Defined on file sysfs-bus-coresight-devices-cti

(Write) Attach a CTI input trigger to a CTM channel.

/sys/bus/coresight/devices/<cti-name>/channels/trigin_detach

Defined on file sysfs-bus-coresight-devices-cti

(Write) Detach a CTI input trigger from a CTM channel.

/sys/bus/coresight/devices/<cti-name>/channels/trigout_attach

Defined on file sysfs-bus-coresight-devices-cti

(Write) Attach a CTI output trigger to a CTM channel.

/sys/bus/coresight/devices/<cti-name>/channels/trigout_detach

Defined on file sysfs-bus-coresight-devices-cti

(Write) Detach a CTI output trigger from a CTM channel.

/sys/bus/coresight/devices/<cti-name>/channels/trigout_filtered

Defined on file sysfs-bus-coresight-devices-cti

(Read) List of output triggers filtered across all connections.

/sys/bus/coresight/devices/<cti-name>/ctmid

Defined on file sysfs-bus-coresight-devices-cti

(Read) Display the associated CTM ID

/sys/bus/coresight/devices/<cti-name>/enable

Defined on file sysfs-bus-coresight-devices-cti

(RW) Enable/Disable the CTI hardware.

/sys/bus/coresight/devices/<cti-name>/nr_trigger_cons

Defined on file sysfs-bus-coresight-devices-cti

(Read) Number of devices connected to triggers on this CTI

/sys/bus/coresight/devices/<cti-name>/powered

Defined on file sysfs-bus-coresight-devices-cti

(Read) Indicate if the CTI hardware is powered.

/sys/bus/coresight/devices/<cti-name>/regs/appclear

Defined on file sysfs-bus-coresight-devices-cti

(Write) Write APPCLEAR register to deactivate channel.

/sys/bus/coresight/devices/<cti-name>/regs/apppulse

Defined on file sysfs-bus-coresight-devices-cti

(Write) Write APPPULSE to pulse a channel active for one clock cycle.

/sys/bus/coresight/devices/<cti-name>/regs/appset

Defined on file sysfs-bus-coresight-devices-cti

(RW) Set CTIAPPSET register to activate channel. Read back to determine current value of register.

/sys/bus/coresight/devices/<cti-name>/regs/asicctl

Defined on file sysfs-bus-coresight-devices-cti

(RW) Read or write ASICCTL register.

/sys/bus/coresight/devices/<cti-name>/regs/chinstatus

Defined on file sysfs-bus-coresight-devices-cti

(Read) Read current status of channel inputs.

/sys/bus/coresight/devices/<cti-name>/regs/choutstatus

Defined on file sysfs-bus-coresight-devices-cti

(Read) read current status of channel outputs.

/sys/bus/coresight/devices/<cti-name>/regs/gate

Defined on file sysfs-bus-coresight-devices-cti

(RW) Read or write CTIGATE register.

/sys/bus/coresight/devices/<cti-name>/regs/inen

Defined on file sysfs-bus-coresight-devices-cti

(RW) Read or write the CTIINEN register selected by inout_sel.

/sys/bus/coresight/devices/<cti-name>/regs/inout_sel

Defined on file sysfs-bus-coresight-devices-cti

(RW) Select the index for inen and outen registers.

/sys/bus/coresight/devices/<cti-name>/regs/intack

Defined on file sysfs-bus-coresight-devices-cti

(Write) Write the INTACK register.

/sys/bus/coresight/devices/<cti-name>/regs/outen

Defined on file sysfs-bus-coresight-devices-cti

(RW) Read or write the CTIOUTEN register selected by inout_sel.

/sys/bus/coresight/devices/<cti-name>/regs/triginstatus

Defined on file sysfs-bus-coresight-devices-cti

(Read) read current status of input trigger signals

/sys/bus/coresight/devices/<cti-name>/regs/trigoutstatus

Defined on file sysfs-bus-coresight-devices-cti

(Read) read current status of output trigger signals.

/sys/bus/coresight/devices/<cti-name>/triggers<N>/in_signals

Defined on file sysfs-bus-coresight-devices-cti

(Read) Input trigger signals from connected device <N>

/sys/bus/coresight/devices/<cti-name>/triggers<N>/in_types

Defined on file sysfs-bus-coresight-devices-cti

(Read) Functional types for the input trigger signals from connected device <N>

/sys/bus/coresight/devices/<cti-name>/triggers<N>/name

Defined on file sysfs-bus-coresight-devices-cti

(Read) Name of connected device <N>

/sys/bus/coresight/devices/<cti-name>/triggers<N>/out_signals

Defined on file sysfs-bus-coresight-devices-cti

(Read) Output trigger signals to connected device <N>

/sys/bus/coresight/devices/<cti-name>/triggers<N>/out_types

Defined on file sysfs-bus-coresight-devices-cti

(Read) Functional types for the output trigger signals to connected device <N>

/sys/bus/coresight/devices/<memory_map>.[etm|ptm]/addr_acctype

Defined on file sysfs-bus-coresight-devices-etm3x

(RW) Used in conjunction with @addr_idx. Specifies characteristics about the address comparator being configure, for example the access type, the kind of instruction to trace, processor context ID to trigger on, etc. Individual fields in the access type register may vary on the version of the trace entity.

/sys/bus/coresight/devices/<memory_map>.[etm|ptm]/addr_idx

Defined on file sysfs-bus-coresight-devices-etm3x

Select which address comparator or pair (of comparators) to work with.

/sys/bus/coresight/devices/<memory_map>.[etm|ptm]/addr_range

Defined on file sysfs-bus-coresight-devices-etm3x

(RW) Used in conjunction with @addr_idx. Specifies the range of addresses to trigger on. Inclusion or exclusion is specified in the corresponding access type register.

/sys/bus/coresight/devices/<memory_map>.[etm|ptm]/addr_single

Defined on file sysfs-bus-coresight-devices-etm3x

(RW) Used in conjunction with @addr_idx. Specifies the single address to trigger on, highly influenced by the configuration options of the corresponding access type register.

/sys/bus/coresight/devices/<memory_map>.[etm|ptm]/addr_start

Defined on file sysfs-bus-coresight-devices-etm3x

(RW) Used in conjunction with @addr_idx. Specifies the single address to start tracing on, highly influenced by the configuration options of the corresponding access type register.

/sys/bus/coresight/devices/<memory_map>.[etm|ptm]/addr_stop

Defined on file sysfs-bus-coresight-devices-etm3x

(RW) Used in conjunction with @addr_idx. Specifies the single address to stop tracing on, highly influenced by the configuration options of the corresponding access type register.

/sys/bus/coresight/devices/<memory_map>.[etm|ptm]/cntr_event

Defined on file sysfs-bus-coresight-devices-etm3x

(RW) Used in conjunction with cntr_idx, give access to the counter event register.

/sys/bus/coresight/devices/<memory_map>.[etm|ptm]/cntr_idx

Defined on file sysfs-bus-coresight-devices-etm3x

(RW) Specifies the counter to work on.

/sys/bus/coresight/devices/<memory_map>.[etm|ptm]/cntr_rld_event

Defined on file sysfs-bus-coresight-devices-etm3x

(RW) Used in conjunction with cntr_idx, give access to the counter reload event register.

/sys/bus/coresight/devices/<memory_map>.[etm|ptm]/cntr_rld_val

Defined on file sysfs-bus-coresight-devices-etm3x

(RW) Used in conjunction with cntr_idx, give access to the counter reload value register.

/sys/bus/coresight/devices/<memory_map>.[etm|ptm]/cntr_val

Defined on file sysfs-bus-coresight-devices-etm3x

(RW) Used in conjunction with cntr_idx, give access to the counter value register.

/sys/bus/coresight/devices/<memory_map>.[etm|ptm]/cpu

Defined on file sysfs-bus-coresight-devices-etm3x

(RO) Holds the cpu number this tracer is affined to.

/sys/bus/coresight/devices/<memory_map>.[etm|ptm]/ctxid_idx

Defined on file sysfs-bus-coresight-devices-etm3x

(RW) Specifies the index of the context ID register to be selected.

/sys/bus/coresight/devices/<memory_map>.[etm|ptm]/ctxid_mask

Defined on file sysfs-bus-coresight-devices-etm3x

(RW) Mask to apply to all the context ID comparator.

/sys/bus/coresight/devices/<memory_map>.[etm|ptm]/ctxid_pid

Defined on file sysfs-bus-coresight-devices-etm3x

(RW) Used with the ctxid_idx, specify with context ID to trigger on.

/sys/bus/coresight/devices/<memory_map>.[etm|ptm]/curr_seq_state

Defined on file sysfs-bus-coresight-devices-etm3x

(Read) Holds the current state of the sequencer.

/sys/bus/coresight/devices/<memory_map>.[etm|ptm]/enable_event

Defined on file sysfs-bus-coresight-devices-etm3x

(RW) Defines which event triggers a trace.

/sys/bus/coresight/devices/<memory_map>.[etm|ptm]/enable_source

Defined on file sysfs-bus-coresight-devices-etm3x

(RW) Enable/disable tracing on this specific trace entiry. Enabling a source implies the source has been configured properly and a sink has been identidifed for it. The path of coresight components linking the source to the sink is configured and managed automatically by the coresight framework.

/sys/bus/coresight/devices/<memory_map>.[etm|ptm]/etmsr

Defined on file sysfs-bus-coresight-devices-etm3x

(RW) Gives access to the ETM status register, which holds programming information and status on certains events.

/sys/bus/coresight/devices/<memory_map>.[etm|ptm]/fifofull_level

Defined on file sysfs-bus-coresight-devices-etm3x

(RW) Number of byte left in the fifo before considering it full. Depending on the tracer’s version, can also hold threshold for data suppression.

/sys/bus/coresight/devices/<memory_map>.[etm|ptm]/mgmt/etmccer

Defined on file sysfs-bus-coresight-devices-etm3x

(RO) Print the content of the ETM Configuration Code Extension register (0x1e8). The value is read directly from the HW.

/sys/bus/coresight/devices/<memory_map>.[etm|ptm]/mgmt/etmccr

Defined on file sysfs-bus-coresight-devices-etm3x

(RO) Print the content of the ETM Configuration Code register (0x004). The value is read directly from the HW.

/sys/bus/coresight/devices/<memory_map>.[etm|ptm]/mgmt/etmcr

Defined on file sysfs-bus-coresight-devices-etm3x

(RO) Print the content of the ETM Main Control register (0x000). The value is read directly from the HW.

/sys/bus/coresight/devices/<memory_map>.[etm|ptm]/mgmt/etmidr

Defined on file sysfs-bus-coresight-devices-etm3x

(RO) Print the content of the ETM ID register (0x1e4). The value is read directly from the HW.

/sys/bus/coresight/devices/<memory_map>.[etm|ptm]/mgmt/etmscr

Defined on file sysfs-bus-coresight-devices-etm3x

(RO) Print the content of the ETM System Configuration register (0x014). The value is read directly from the HW.

/sys/bus/coresight/devices/<memory_map>.[etm|ptm]/mgmt/etmtecr1

Defined on file sysfs-bus-coresight-devices-etm3x

(RO) Print the content of the ETM Enable Control #1 register (0x024). The value is read directly from the HW.

/sys/bus/coresight/devices/<memory_map>.[etm|ptm]/mgmt/etmtecr2

Defined on file sysfs-bus-coresight-devices-etm3x

(RO) Print the content of the ETM Enable Control #2 register (0x01c). The value is read directly from the HW.

/sys/bus/coresight/devices/<memory_map>.[etm|ptm]/mgmt/etmteevr

Defined on file sysfs-bus-coresight-devices-etm3x

(RO) Print the content of the ETM Trace Enable Event register (0x020). The value is read directly from the HW.

/sys/bus/coresight/devices/<memory_map>.[etm|ptm]/mgmt/etmtraceidr

Defined on file sysfs-bus-coresight-devices-etm3x

(RO) Print the content of the ETM Trace ID register (0x200). The value is read directly from the HW.

/sys/bus/coresight/devices/<memory_map>.[etm|ptm]/mgmt/etmtsscr

Defined on file sysfs-bus-coresight-devices-etm3x

(RO) Print the content of the ETM Trace Start/Stop Control register (0x018). The value is read directly from the HW.

/sys/bus/coresight/devices/<memory_map>.[etm|ptm]/mode

Defined on file sysfs-bus-coresight-devices-etm3x

(RW) Interface with the driver’s ‘mode’ field, controlling various aspect of the trace entity such as time stamping, context ID size and cycle accurate tracing. Driver specific and bound to change depending on the driver.

/sys/bus/coresight/devices/<memory_map>.[etm|ptm]/nr_addr_cmp

Defined on file sysfs-bus-coresight-devices-etm3x

(Read) Provides the number of address comparators pairs accessible on a trace unit, as specified by bit 3:0 of register ETMCCR.

/sys/bus/coresight/devices/<memory_map>.[etm|ptm]/nr_cntr

Defined on file sysfs-bus-coresight-devices-etm3x

(Read) Provides the number of counters accessible on a trace unit, as specified by bit 15:13 of register ETMCCR.

/sys/bus/coresight/devices/<memory_map>.[etm|ptm]/nr_ctxid_cmp

Defined on file sysfs-bus-coresight-devices-etm3x

(Read) Provides the number of context ID comparator available on a trace unit, as specified by bit 25:24 of register ETMCCR.

/sys/bus/coresight/devices/<memory_map>.[etm|ptm]/reset

Defined on file sysfs-bus-coresight-devices-etm3x

(Write) Cancels all configuration on a trace unit and set it back to its boot configuration.

/sys/bus/coresight/devices/<memory_map>.[etm|ptm]/seq_12_event

Defined on file sysfs-bus-coresight-devices-etm3x

(RW) Defines the event that causes the sequencer to transition from state 1 to state 2.

/sys/bus/coresight/devices/<memory_map>.[etm|ptm]/seq_13_event

Defined on file sysfs-bus-coresight-devices-etm3x

(RW) Defines the event that causes the sequencer to transition from state 1 to state 3.

/sys/bus/coresight/devices/<memory_map>.[etm|ptm]/seq_21_event

Defined on file sysfs-bus-coresight-devices-etm3x

(RW) Defines the event that causes the sequencer to transition from state 2 to state 1.

/sys/bus/coresight/devices/<memory_map>.[etm|ptm]/seq_23_event

Defined on file sysfs-bus-coresight-devices-etm3x

(RW) Defines the event that causes the sequencer to transition from state 2 to state 3.

/sys/bus/coresight/devices/<memory_map>.[etm|ptm]/seq_31_event

Defined on file sysfs-bus-coresight-devices-etm3x

(RW) Defines the event that causes the sequencer to transition from state 3 to state 1.

/sys/bus/coresight/devices/<memory_map>.[etm|ptm]/seq_32_event

Defined on file sysfs-bus-coresight-devices-etm3x

(RW) Defines the event that causes the sequencer to transition from state 3 to state 2.

/sys/bus/coresight/devices/<memory_map>.[etm|ptm]/sync_freq

Defined on file sysfs-bus-coresight-devices-etm3x

(RW) Holds the trace synchronization frequency value - must be programmed with the various implementation behavior in mind.

/sys/bus/coresight/devices/<memory_map>.[etm|ptm]/timestamp_event

Defined on file sysfs-bus-coresight-devices-etm3x

(RW) Defines an event that requests the insertion of a timestamp into the trace stream.

/sys/bus/coresight/devices/<memory_map>.[etm|ptm]/traceid

Defined on file sysfs-bus-coresight-devices-etm3x

(RO) Holds the trace ID that will appear in the trace stream coming from this trace entity.

/sys/bus/coresight/devices/<memory_map>.[etm|ptm]/trigger_event

Defined on file sysfs-bus-coresight-devices-etm3x

(RW) Define the event that controls the trigger.

/sys/bus/coresight/devices/<memory_map>.etb/enable_sink

Defined on file sysfs-bus-coresight-devices-etb10

(RW) Add/remove a sink from a trace path. There can be multiple source for a single sink.

ex:

echo 1 > /sys/bus/coresight/devices/20010000.etb/enable_sink

/sys/bus/coresight/devices/<memory_map>.etb/mgmt/ctl

Defined on file sysfs-bus-coresight-devices-etb10

(Read) Shows the value held by the ETB Control register. The value is read directly from HW register CTL, 0x020.

/sys/bus/coresight/devices/<memory_map>.etb/mgmt/ffcr

Defined on file sysfs-bus-coresight-devices-etb10

(Read) Shows the value held by the ETB Formatter and Flush Control register. The value is read directly from HW register FFCR, 0x304.

/sys/bus/coresight/devices/<memory_map>.etb/mgmt/ffsr

Defined on file sysfs-bus-coresight-devices-etb10

(Read) Shows the value held by the ETB Formatter and Flush Status register. The value is read directly from HW register FFSR, 0x300.

/sys/bus/coresight/devices/<memory_map>.etb/mgmt/rdp

Defined on file sysfs-bus-coresight-devices-etb10

(Read) Defines the depth, in words, of the trace RAM in powers of 2. The value is read directly from HW register RDP, 0x004.

/sys/bus/coresight/devices/<memory_map>.etb/mgmt/rrp

Defined on file sysfs-bus-coresight-devices-etb10

(Read) Shows the value held by the ETB RAM Read Pointer register that is used to read entries from the Trace RAM over the APB interface. The value is read directly from HW register RRP, 0x014.

/sys/bus/coresight/devices/<memory_map>.etb/mgmt/rwp

Defined on file sysfs-bus-coresight-devices-etb10

(Read) Shows the value held by the ETB RAM Write Pointer register that is used to sets the write pointer to write entries from the CoreSight bus into the Trace RAM. The value is read directly from HW register RWP, 0x018.

/sys/bus/coresight/devices/<memory_map>.etb/mgmt/sts

Defined on file sysfs-bus-coresight-devices-etb10

(Read) Shows the value held by the ETB status register. The value is read directly from HW register STS, 0x00C.

/sys/bus/coresight/devices/<memory_map>.etb/mgmt/trg

Defined on file sysfs-bus-coresight-devices-etb10

(Read) Similar to “trigger_cntr” above except that this value is read directly from HW register TRG, 0x01C.

/sys/bus/coresight/devices/<memory_map>.etb/trigger_cntr

Defined on file sysfs-bus-coresight-devices-etb10

(RW) Disables write access to the Trace RAM by stopping the formatter after a defined number of words have been stored following the trigger event. The number of 32-bit words written into the Trace RAM following the trigger event is equal to the value stored in this register+1 (from ARM ETB-TRM).

/sys/bus/coresight/devices/<memory_map>.funnel/funnel_ctrl

Defined on file sysfs-bus-coresight-devices-funnel

(RW) Enables the slave ports and defines the hold time of the slave ports.

/sys/bus/coresight/devices/<memory_map>.funnel/priority

Defined on file sysfs-bus-coresight-devices-funnel

(RW) Defines input port priority order.

/sys/bus/coresight/devices/<memory_map>.stm/enable_source

Defined on file sysfs-bus-coresight-devices-stm

(RW) Enable/disable tracing on this specific trace macrocell. Enabling the trace macrocell implies it has been configured properly and a sink has been identified for it. The path of coresight components linking the source to the sink is configured and managed automatically by the coresight framework.

/sys/bus/coresight/devices/<memory_map>.stm/hwevent_enable

Defined on file sysfs-bus-coresight-devices-stm

(RW) Provides access to the HW event enable register, used in conjunction with HW event bank select register.

/sys/bus/coresight/devices/<memory_map>.stm/hwevent_select

Defined on file sysfs-bus-coresight-devices-stm

(RW) Gives access to the HW event block select register (STMHEBSR) in order to configure up to 256 channels. Used in conjunction with “hwevent_enable” register as described above.

/sys/bus/coresight/devices/<memory_map>.stm/port_enable

Defined on file sysfs-bus-coresight-devices-stm

(RW) Provides access to the stimulus port enable register (STMSPER). Used in conjunction with “port_select” described below.

/sys/bus/coresight/devices/<memory_map>.stm/port_select

Defined on file sysfs-bus-coresight-devices-stm

(RW) Used to determine which bank of stimulus port bit in register STMSPER (see above) apply to.

/sys/bus/coresight/devices/<memory_map>.stm/status

Defined on file sysfs-bus-coresight-devices-stm

(Read) List various control and status registers. The specific layout and content is driver specific.

/sys/bus/coresight/devices/<memory_map>.stm/traceid

Defined on file sysfs-bus-coresight-devices-stm

(RW) Holds the trace ID that will appear in the trace stream coming from this trace entity.

/sys/bus/coresight/devices/<memory_map>.tmc/buf_mode_preferred

Defined on file sysfs-bus-coresight-devices-tmc

(RW) Current Coresight TMC-ETR buffer mode selected. But user could only provide a mode which is supported for a given ETR device. This file is available only for TMC ETR devices.

/sys/bus/coresight/devices/<memory_map>.tmc/buf_modes_available

Defined on file sysfs-bus-coresight-devices-tmc

(Read) Shows all supported Coresight TMC-ETR buffer modes available for the users to configure explicitly. This file is available only for TMC ETR devices.

/sys/bus/coresight/devices/<memory_map>.tmc/buffer_size

Defined on file sysfs-bus-coresight-devices-tmc

(RW) Size of the trace buffer for TMC-ETR when used in SYSFS mode. Writable only for TMC-ETR configurations. The value should be aligned to the kernel pagesize.

/sys/bus/coresight/devices/<memory_map>.tmc/mgmt/ctl

Defined on file sysfs-bus-coresight-devices-tmc

(Read) Shows the value held by the TMC Control register. The value is read directly from HW register CTL, 0x020.

/sys/bus/coresight/devices/<memory_map>.tmc/mgmt/devid

Defined on file sysfs-bus-coresight-devices-tmc

(Read) Indicates the capabilities of the Coresight TMC. The value is read directly from the DEVID register, 0xFC8,

/sys/bus/coresight/devices/<memory_map>.tmc/mgmt/ffcr

Defined on file sysfs-bus-coresight-devices-tmc

(Read) Shows the value held by the TMC Formatter and Flush Control register. The value is read directly from HW register FFCR, 0x304.

/sys/bus/coresight/devices/<memory_map>.tmc/mgmt/ffsr

Defined on file sysfs-bus-coresight-devices-tmc

(Read) Shows the value held by the TMC Formatter and Flush Status register. The value is read directly from HW register FFSR, 0x300.

/sys/bus/coresight/devices/<memory_map>.tmc/mgmt/mode

Defined on file sysfs-bus-coresight-devices-tmc

(Read) Shows the value held by the TMC Mode register, which indicate the mode the device has been configured to enact. The The value is read directly from the MODE register, 0x028.

/sys/bus/coresight/devices/<memory_map>.tmc/mgmt/rrp

Defined on file sysfs-bus-coresight-devices-tmc

(Read) Shows the value held by the TMC RAM Read Pointer register that is used to read entries from the Trace RAM over the APB interface. The value is read directly from HW register RRP, 0x014.

/sys/bus/coresight/devices/<memory_map>.tmc/mgmt/rsz

Defined on file sysfs-bus-coresight-devices-tmc

(Read) Defines the size, in 32-bit words, of the local RAM buffer. The value is read directly from HW register RSZ, 0x004.

/sys/bus/coresight/devices/<memory_map>.tmc/mgmt/rwp

Defined on file sysfs-bus-coresight-devices-tmc

(Read) Shows the value held by the TMC RAM Write Pointer register that is used to sets the write pointer to write entries from the CoreSight bus into the Trace RAM. The value is read directly from HW register RWP, 0x018.

/sys/bus/coresight/devices/<memory_map>.tmc/mgmt/sts

Defined on file sysfs-bus-coresight-devices-tmc

(Read) Shows the value held by the TMC status register. The value is read directly from HW register STS, 0x00C.

/sys/bus/coresight/devices/<memory_map>.tmc/mgmt/trg

Defined on file sysfs-bus-coresight-devices-tmc

(Read) Similar to “trigger_cntr” above except that this value is read directly from HW register TRG, 0x01C.

/sys/bus/coresight/devices/<memory_map>.tmc/trigger_cntr

Defined on file sysfs-bus-coresight-devices-tmc

(RW) Disables write access to the Trace RAM by stopping the formatter after a defined number of words have been stored following the trigger event. Additional interface for this driver are expected to be added as it matures.

/sys/bus/coresight/devices/<tpdm-name>/cmb_mode

Defined on file sysfs-bus-coresight-devices-tpdm

(Write) Set the data collection mode of CMB tpdm. Continuous change creates CMB data set elements on every CMBCLK edge. Trace-on-change creates CMB data set elements only when a new data set element differs in value from the previous element in a CMB data set.

Accepts only one of the 2 values - 0 or 1. 0 : Continuous CMB collection mode. 1 : Trace-on-change CMB collection mode.

/sys/bus/coresight/devices/<tpdm-name>/cmb_msr/msr[0:31]

Defined on file sysfs-bus-coresight-devices-tpdm

(RW) Set/Get the MSR(mux select register) for the CMB subunit TPDM.

/sys/bus/coresight/devices/<tpdm-name>/cmb_patt/enable_ts

Defined on file sysfs-bus-coresight-devices-tpdm

(Write) Set the pattern timestamp of CMB tpdm. Read the pattern timestamp of CMB tpdm.

Accepts only one of the 2 values - 0 or 1. 0 : Disable CMB pattern timestamp. 1 : Enable CMB pattern timestamp.

/sys/bus/coresight/devices/<tpdm-name>/cmb_trig_patt/xpmr[0:1]

Defined on file sysfs-bus-coresight-devices-tpdm

(RW) Set/Get the mask of the trigger pattern for the CMB subunit TPDM.

/sys/bus/coresight/devices/<tpdm-name>/cmb_trig_patt/xpr[0:1]

Defined on file sysfs-bus-coresight-devices-tpdm

(RW) Set/Get the value of the trigger pattern for the CMB subunit TPDM.

/sys/bus/coresight/devices/<tpdm-name>/cmb_trig_ts

Defined on file sysfs-bus-coresight-devices-tpdm

(RW) Set/Get the trigger timestamp of the CMB for tpdm.

Accepts only one of the 2 values - 0 or 1. 0 : Set the CMB trigger type to false 1 : Set the CMB trigger type to true

/sys/bus/coresight/devices/<tpdm-name>/cmb_ts_all

Defined on file sysfs-bus-coresight-devices-tpdm

(RW) Read or write the status of timestamp upon all interface. Only value 0 and 1 can be written to this node. Set this node to 1 to request timestamp to all trace packet. Accepts only one of the 2 values - 0 or 1. 0 : Disable the timestamp of all trace packets. 1 : Enable the timestamp of all trace packets.

/sys/bus/coresight/devices/<tpdm-name>/dsb_edge/ctrl_idx

Defined on file sysfs-bus-coresight-devices-tpdm

(RW) Set/Get the index number of the edge detection for the DSB subunit TPDM. Since there are at most 256 edge detections, this value ranges from 0 to 255.

/sys/bus/coresight/devices/<tpdm-name>/dsb_edge/ctrl_mask

Defined on file sysfs-bus-coresight-devices-tpdm

Write a data to mask the edge detection corresponding to the index number. Before writing data to this sysfs file, “ctrl_idx” should be written first to configure the index number of the edge detection which needs to be masked.

Accepts only one of the 2 values - 0 or 1.

/sys/bus/coresight/devices/<tpdm-name>/dsb_edge/ctrl_val

Defined on file sysfs-bus-coresight-devices-tpdm

Write a data to control the edge detection corresponding to the index number. Before writing data to this sysfs file, “ctrl_idx” should be written first to configure the index number of the edge detection which needs to be controlled.

Accepts only one of the following values. 0 - Rising edge detection 1 - Falling edge detection 2 - Rising and falling edge detection (toggle detection)

/sys/bus/coresight/devices/<tpdm-name>/dsb_edge/edcmr[0:7]

Defined on file sysfs-bus-coresight-devices-tpdm

Read a set of the edge control mask of the DSB in TPDM.

/sys/bus/coresight/devices/<tpdm-name>/dsb_edge/edcr[0:15]

Defined on file sysfs-bus-coresight-devices-tpdm

Read a set of the edge control value of the DSB in TPDM.

/sys/bus/coresight/devices/<tpdm-name>/dsb_mode

Defined on file sysfs-bus-coresight-devices-tpdm

(RW) Set/Get the programming mode of the DSB for tpdm.

Accepts the value needs to be greater than 0. What data bits do is listed below. Bit[0:1] : Test mode control bit for choosing the inputs. Bit[3] : Set to 0 for low performance mode. Set to 1 for high performance mode. Bit[4:8] : Select byte lane for high performance mode.

/sys/bus/coresight/devices/<tpdm-name>/dsb_msr/msr[0:31]

Defined on file sysfs-bus-coresight-devices-tpdm

(RW) Set/Get the MSR(mux select register) for the DSB subunit TPDM.

/sys/bus/coresight/devices/<tpdm-name>/dsb_patt/enable_ts

Defined on file sysfs-bus-coresight-devices-tpdm

(Write) Set the pattern timestamp of DSB tpdm. Read the pattern timestamp of DSB tpdm.

Accepts only one of the 2 values - 0 or 1. 0 : Disable DSB pattern timestamp. 1 : Enable DSB pattern timestamp.

/sys/bus/coresight/devices/<tpdm-name>/dsb_patt/set_type

Defined on file sysfs-bus-coresight-devices-tpdm

(Write) Set the pattern type of DSB tpdm. Read the pattern type of DSB tpdm.

Accepts only one of the 2 values - 0 or 1. 0 : Set the DSB pattern type to value. 1 : Set the DSB pattern type to toggle.

/sys/bus/coresight/devices/<tpdm-name>/dsb_patt/tpmr[0:1]

Defined on file sysfs-bus-coresight-devices-tpdm

(RW) Set/Get the mask of the pattern for the CMB subunit TPDM.

/sys/bus/coresight/devices/<tpdm-name>/dsb_patt/tpmr[0:7]

Defined on file sysfs-bus-coresight-devices-tpdm

(RW) Set/Get the mask of the pattern for the DSB subunit TPDM.

/sys/bus/coresight/devices/<tpdm-name>/dsb_patt/tpr[0:1]

Defined on file sysfs-bus-coresight-devices-tpdm

(RW) Set/Get the value of the pattern for the CMB subunit TPDM.

/sys/bus/coresight/devices/<tpdm-name>/dsb_patt/tpr[0:7]

Defined on file sysfs-bus-coresight-devices-tpdm

(RW) Set/Get the value of the pattern for the DSB subunit TPDM.

/sys/bus/coresight/devices/<tpdm-name>/dsb_trig_patt/xpmr[0:7]

Defined on file sysfs-bus-coresight-devices-tpdm

(RW) Set/Get the mask of the trigger pattern for the DSB subunit TPDM.

/sys/bus/coresight/devices/<tpdm-name>/dsb_trig_patt/xpr[0:7]

Defined on file sysfs-bus-coresight-devices-tpdm

(RW) Set/Get the value of the trigger pattern for the DSB subunit TPDM.

/sys/bus/coresight/devices/<tpdm-name>/dsb_trig_ts

Defined on file sysfs-bus-coresight-devices-tpdm

(RW) Set/Get the trigger timestamp of the DSB for tpdm.

Accepts only one of the 2 values - 0 or 1. 0 : Set the DSB trigger type to false 1 : Set the DSB trigger type to true

/sys/bus/coresight/devices/<tpdm-name>/dsb_trig_type

Defined on file sysfs-bus-coresight-devices-tpdm

(RW) Set/Get the trigger type of the DSB for tpdm.

Accepts only one of the 2 values - 0 or 1. 0 : Set the DSB trigger type to false 1 : Set the DSB trigger type to true

/sys/bus/coresight/devices/<tpdm-name>/integration_test

Defined on file sysfs-bus-coresight-devices-tpdm

(Write) Run integration test for tpdm. Integration test will generate test data for tpdm. It can help to make sure that the trace path is enabled and the link configurations are fine.

Accepts only one of the 2 values - 1 or 2. 1 : Generate 64 bits data 2 : Generate 32 bits data

/sys/bus/coresight/devices/<tpdm-name>/reset_dataset

Defined on file sysfs-bus-coresight-devices-tpdm

(Write) Reset the dataset of the tpdm.

Accepts only one value - 1. 1 : Reset the dataset of the tpdm

/sys/bus/coresight/devices/etm<N>/addr_cmp_view

Defined on file sysfs-bus-coresight-devices-etm4x

(Read) Print the current settings for the selected address comparator.

/sys/bus/coresight/devices/etm<N>/addr_exlevel_s_ns

Defined on file sysfs-bus-coresight-devices-etm4x

(RW) Set the Exception Level matching bits for secure and non-secure exception levels.

/sys/bus/coresight/devices/etm<N>/addr_idx

Defined on file sysfs-bus-coresight-devices-etm4x

(RW) Select which address comparator or pair (of comparators) to work with.

/sys/bus/coresight/devices/etm<N>/addr_instdatatype

Defined on file sysfs-bus-coresight-devices-etm4x

(RW) Controls what type of comparison the trace unit performs.

/sys/bus/coresight/devices/etm<N>/addr_range

Defined on file sysfs-bus-coresight-devices-etm4x

(RW) Used to setup address range comparator values.

/sys/bus/coresight/devices/etm<N>/addr_single

Defined on file sysfs-bus-coresight-devices-etm4x

(RW) Used to setup single address comparator values.

/sys/bus/coresight/devices/etm<N>/bb_ctrl

Defined on file sysfs-bus-coresight-devices-etm4x

(RW) Controls which regions in the memory map are enabled to use branch broadcasting.

/sys/bus/coresight/devices/etm<N>/cntr_ctrl

Defined on file sysfs-bus-coresight-devices-etm4x

(RW) Controls the operation of the selected counter.

/sys/bus/coresight/devices/etm<N>/cntr_idx

Defined on file sysfs-bus-coresight-devices-etm4x

(RW) Select which counter unit to work with.

/sys/bus/coresight/devices/etm<N>/cntr_val

Defined on file sysfs-bus-coresight-devices-etm4x

(RW) This sets or returns the current count value of the specific counter.

/sys/bus/coresight/devices/etm<N>/cntrldvr

Defined on file sysfs-bus-coresight-devices-etm4x

(RW) This sets or returns the reload count value of the specific counter.

/sys/bus/coresight/devices/etm<N>/cpu

Defined on file sysfs-bus-coresight-devices-etm4x

(Read) The CPU this tracing entity is associated with.

/sys/bus/coresight/devices/etm<N>/ctxid_idx

Defined on file sysfs-bus-coresight-devices-etm4x

(RW) Select which context ID comparator to work with.

/sys/bus/coresight/devices/etm<N>/ctxid_masks

Defined on file sysfs-bus-coresight-devices-etm4x

(RW) Mask for all 8 context ID comparator value registers (if implemented).

/sys/bus/coresight/devices/etm<N>/ctxid_pid

Defined on file sysfs-bus-coresight-devices-etm4x

(RW) Get/Set the context ID comparator value to trigger on.

/sys/bus/coresight/devices/etm<N>/cyc_threshold

Defined on file sysfs-bus-coresight-devices-etm4x

(RW) Sets the threshold value for cycle counting.

/sys/bus/coresight/devices/etm<N>/enable_source

Defined on file sysfs-bus-coresight-devices-etm4x

(RW) Enable/disable tracing on this specific trace entiry. Enabling a source implies the source has been configured properly and a sink has been identidifed for it. The path of coresight components linking the source to the sink is configured and managed automatically by the coresight framework.

/sys/bus/coresight/devices/etm<N>/event

Defined on file sysfs-bus-coresight-devices-etm4x

(RW) Controls the tracing of arbitrary events from bank 0 to 3.

/sys/bus/coresight/devices/etm<N>/event_instren

Defined on file sysfs-bus-coresight-devices-etm4x

(RW) Controls the behavior of the events in bank 0 to 3.

/sys/bus/coresight/devices/etm<N>/event_ts

Defined on file sysfs-bus-coresight-devices-etm4x

(RW) Controls the insertion of global timestamps in the trace streams.

/sys/bus/coresight/devices/etm<N>/event_vinst

Defined on file sysfs-bus-coresight-devices-etm4x

(RW) Controls instruction trace filtering.

/sys/bus/coresight/devices/etm<N>/mgmt/trcauthstatus

Defined on file sysfs-bus-coresight-devices-etm4x

(Read) Print the content of the Authentication Status Register (0xFB8). The value is taken directly from the HW.

/sys/bus/coresight/devices/etm<N>/mgmt/trcconfig

Defined on file sysfs-bus-coresight-devices-etm4x

(Read) Print the content of the trace configuration register (0x010) as currently set by SW.

/sys/bus/coresight/devices/etm<N>/mgmt/trcdevarch

Defined on file sysfs-bus-coresight-devices-etm4x

(Read) Print the content of the Device Architecture Register (offset 0xFBC). The value is taken directly read from the HW.

/sys/bus/coresight/devices/etm<N>/mgmt/trcdevid

Defined on file sysfs-bus-coresight-devices-etm4x

(Read) Print the content of the Device ID Register (0xFC8). The value is taken directly from the HW.

/sys/bus/coresight/devices/etm<N>/mgmt/trcdevtype

Defined on file sysfs-bus-coresight-devices-etm4x

(Read) Print the content of the Device Type Register (0xFCC). The value is taken directly from the HW.

/sys/bus/coresight/devices/etm<N>/mgmt/trclsr

Defined on file sysfs-bus-coresight-devices-etm4x

(Read) Print the content of the SW Lock Status Register (0xFB4). The value is taken directly from the HW.

/sys/bus/coresight/devices/etm<N>/mgmt/trcoslsr

Defined on file sysfs-bus-coresight-devices-etm4x

(Read) Print the content of the OS Lock Status Register (0x304). The value it taken directly from the HW.

/sys/bus/coresight/devices/etm<N>/mgmt/trcpdcr

Defined on file sysfs-bus-coresight-devices-etm4x

(Read) Print the content of the Power Down Control Register (0x310). The value is taken directly from the HW.

/sys/bus/coresight/devices/etm<N>/mgmt/trcpdsr

Defined on file sysfs-bus-coresight-devices-etm4x

(Read) Print the content of the Power Down Status Register (0x314). The value is taken directly from the HW.

/sys/bus/coresight/devices/etm<N>/mgmt/trcpidr0

Defined on file sysfs-bus-coresight-devices-etm4x

(Read) Print the content of the Peripheral ID0 Register (0xFE0). The value is taken directly from the HW.

/sys/bus/coresight/devices/etm<N>/mgmt/trcpidr1

Defined on file sysfs-bus-coresight-devices-etm4x

(Read) Print the content of the Peripheral ID1 Register (0xFE4). The value is taken directly from the HW.

/sys/bus/coresight/devices/etm<N>/mgmt/trcpidr2

Defined on file sysfs-bus-coresight-devices-etm4x

(Read) Print the content of the Peripheral ID2 Register (0xFE8). The value is taken directly from the HW.

/sys/bus/coresight/devices/etm<N>/mgmt/trcpidr3

Defined on file sysfs-bus-coresight-devices-etm4x

(Read) Print the content of the Peripheral ID3 Register (0xFEC). The value is taken directly from the HW.

/sys/bus/coresight/devices/etm<N>/mgmt/trctraceid

Defined on file sysfs-bus-coresight-devices-etm4x

(Read) Print the content of the trace ID register (0x040).

/sys/bus/coresight/devices/etm<N>/mode

Defined on file sysfs-bus-coresight-devices-etm4x

(RW) Controls various modes supported by this ETM, for example P0 instruction tracing, branch broadcast, cycle counting and context ID tracing.

/sys/bus/coresight/devices/etm<N>/nr_addr_cmp

Defined on file sysfs-bus-coresight-devices-etm4x

(Read) Indicates the number of address comparator pairs that are available for tracing.

/sys/bus/coresight/devices/etm<N>/nr_cntr

Defined on file sysfs-bus-coresight-devices-etm4x

(Read) Indicates the number of counters that are available for tracing.

/sys/bus/coresight/devices/etm<N>/nr_ext_inp

Defined on file sysfs-bus-coresight-devices-etm4x

(Read) Indicates how many external inputs are implemented.

/sys/bus/coresight/devices/etm<N>/nr_pe_cmp

Defined on file sysfs-bus-coresight-devices-etm4x

(Read) Indicates the number of PE comparator inputs that are available for tracing.

/sys/bus/coresight/devices/etm<N>/nr_resource

Defined on file sysfs-bus-coresight-devices-etm4x

(Read) Indicates the number of resource selection pairs that are available for tracing.

/sys/bus/coresight/devices/etm<N>/nr_ss_cmp

Defined on file sysfs-bus-coresight-devices-etm4x

(Read) Indicates the number of single-shot comparator controls that are available for tracing.

/sys/bus/coresight/devices/etm<N>/nrseqstate

Defined on file sysfs-bus-coresight-devices-etm4x

(Read) Indicates the number of sequencer states that are implemented.

/sys/bus/coresight/devices/etm<N>/ns_exlevel_vinst

Defined on file sysfs-bus-coresight-devices-etm4x

(RW) In non-secure state, each bit controls whether instruction tracing is enabled for the corresponding exception level.

/sys/bus/coresight/devices/etm<N>/numcidc

Defined on file sysfs-bus-coresight-devices-etm4x

(Read) Indicates the number of Context ID comparators that are available for tracing.

/sys/bus/coresight/devices/etm<N>/numvmidc

Defined on file sysfs-bus-coresight-devices-etm4x

(Read) Indicates the number of VMID comparators that are available for tracing.

/sys/bus/coresight/devices/etm<N>/pe

Defined on file sysfs-bus-coresight-devices-etm4x

(RW) Controls which PE to trace.

/sys/bus/coresight/devices/etm<N>/res_ctrl

Defined on file sysfs-bus-coresight-devices-etm4x

(RW) Controls the selection of the resources in the trace unit.

/sys/bus/coresight/devices/etm<N>/res_idx

Defined on file sysfs-bus-coresight-devices-etm4x

(RW) Select which resource selection unit to work with.

/sys/bus/coresight/devices/etm<N>/reset

Defined on file sysfs-bus-coresight-devices-etm4x

(Write) Cancels all configuration on a trace unit and set it back to its boot configuration.

/sys/bus/coresight/devices/etm<N>/s_exlevel_vinst

Defined on file sysfs-bus-coresight-devices-etm4x

(RW) In Secure state, each bit controls whether instruction tracing is enabled for the corresponding exception level.

/sys/bus/coresight/devices/etm<N>/seq_event

Defined on file sysfs-bus-coresight-devices-etm4x

(RW) Moves the sequencer state to a specific state.

/sys/bus/coresight/devices/etm<N>/seq_idx

Defined on file sysfs-bus-coresight-devices-etm4x

(RW) Select which sequensor.

/sys/bus/coresight/devices/etm<N>/seq_reset_event

Defined on file sysfs-bus-coresight-devices-etm4x

(RW) Moves the sequencer to state 0 when a programmed event occurs.

/sys/bus/coresight/devices/etm<N>/seq_state

Defined on file sysfs-bus-coresight-devices-etm4x

(RW) Use this to set, or read, the sequencer state.

/sys/bus/coresight/devices/etm<N>/sshot_ctrl

Defined on file sysfs-bus-coresight-devices-etm4x

(RW) Access the selected single shot control register.

/sys/bus/coresight/devices/etm<N>/sshot_idx

Defined on file sysfs-bus-coresight-devices-etm4x

(RW) Select the single shot control register to access.

/sys/bus/coresight/devices/etm<N>/sshot_pe_ctrl

Defined on file sysfs-bus-coresight-devices-etm4x

(RW) Access the selected single show PE comparator control register.

/sys/bus/coresight/devices/etm<N>/sshot_status

Defined on file sysfs-bus-coresight-devices-etm4x

(Read) Print the current value of the selected single shot status register.

/sys/bus/coresight/devices/etm<N>/syncfreq

Defined on file sysfs-bus-coresight-devices-etm4x

(RW) Controls how often trace synchronization requests occur.

/sys/bus/coresight/devices/etm<N>/trcidr/trcidr0

Defined on file sysfs-bus-coresight-devices-etm4x

(Read) Returns the tracing capabilities of the trace unit (0x1E0). The value is taken directly from the HW.

/sys/bus/coresight/devices/etm<N>/trcidr/trcidr1

Defined on file sysfs-bus-coresight-devices-etm4x

(Read) Returns the tracing capabilities of the trace unit (0x1E4). The value is taken directly from the HW.

/sys/bus/coresight/devices/etm<N>/trcidr/trcidr10

Defined on file sysfs-bus-coresight-devices-etm4x

(Read) Returns the number of P1 right-hand keys that the trace unit can use (0x188). The value is taken directly from the HW.

/sys/bus/coresight/devices/etm<N>/trcidr/trcidr11

Defined on file sysfs-bus-coresight-devices-etm4x

(Read) Returns the number of special P1 right-hand keys that the trace unit can use (0x18C). The value is taken directly from the HW.

/sys/bus/coresight/devices/etm<N>/trcidr/trcidr12

Defined on file sysfs-bus-coresight-devices-etm4x

(Read) Returns the number of conditional P1 right-hand keys that the trace unit can use (0x190). The value is taken directly from the HW.

/sys/bus/coresight/devices/etm<N>/trcidr/trcidr13

Defined on file sysfs-bus-coresight-devices-etm4x

(Read) Returns the number of special conditional P1 right-hand keys that the trace unit can use (0x194). The value is taken directly from the HW.

/sys/bus/coresight/devices/etm<N>/trcidr/trcidr2

Defined on file sysfs-bus-coresight-devices-etm4x

(Read) Returns the maximum size of the data value, data address, VMID, context ID and instruction address in the trace unit (0x1E8). The value is taken directly from the HW.

/sys/bus/coresight/devices/etm<N>/trcidr/trcidr3

Defined on file sysfs-bus-coresight-devices-etm4x

(Read) Returns the value associated with various resources available to the trace unit. See the Trace Macrocell architecture specification for more details (0x1E8). The value is taken directly from the HW.

/sys/bus/coresight/devices/etm<N>/trcidr/trcidr4

Defined on file sysfs-bus-coresight-devices-etm4x

(Read) Returns how many resources the trace unit supports (0x1F0). The value is taken directly from the HW.

/sys/bus/coresight/devices/etm<N>/trcidr/trcidr5

Defined on file sysfs-bus-coresight-devices-etm4x

(Read) Returns how many resources the trace unit supports (0x1F4). The value is taken directly from the HW.

/sys/bus/coresight/devices/etm<N>/trcidr/trcidr8

Defined on file sysfs-bus-coresight-devices-etm4x

(Read) Returns the maximum speculation depth of the instruction trace stream. (0x180). The value is taken directly from the HW.

/sys/bus/coresight/devices/etm<N>/trcidr/trcidr9

Defined on file sysfs-bus-coresight-devices-etm4x

(Read) Returns the number of P0 right-hand keys that the trace unit can use (0x184). The value is taken directly from the HW.

/sys/bus/coresight/devices/etm<N>/ts_source

Defined on file sysfs-bus-coresight-devices-etm4x

(Read) When FEAT_TRF is implemented, value of TRFCR_ELx.TS used for trace session. Otherwise -1 indicates an unknown time source. Check trcidr0.tssize to see if a global timestamp is available.

/sys/bus/coresight/devices/etm<N>/vinst_pe_cmp_start_stop

Defined on file sysfs-bus-coresight-devices-etm4x

(RW) Access the start stop control register for PE input comparators.

/sys/bus/coresight/devices/etm<N>/vmid_idx

Defined on file sysfs-bus-coresight-devices-etm4x

(RW) Select which virtual machine ID comparator to work with.

/sys/bus/coresight/devices/etm<N>/vmid_masks

Defined on file sysfs-bus-coresight-devices-etm4x

(RW) Mask for all 8 virtual machine ID comparator value registers (if implemented).

/sys/bus/coresight/devices/etm<N>/vmid_val

Defined on file sysfs-bus-coresight-devices-etm4x

(RW) Get/Set the virtual machine ID comparator value to trigger on.

/sys/bus/coresight/devices/trbe<cpu>/align

Defined on file sysfs-bus-coresight-devices-trbe

(Read) Shows the TRBE write pointer alignment. This value is fetched from the TRBIDR register.

/sys/bus/coresight/devices/trbe<cpu>/flag

Defined on file sysfs-bus-coresight-devices-trbe

(Read) Shows if TRBE updates in the memory are with access and dirty flag updates as well. This value is fetched from the TRBIDR register.

/sys/bus/coresight/devices/ultra_smb<N>/enable_sink

Defined on file sysfs-bus-coresight-devices-ultra_smb

(RW) Add/remove a SMB device from a trace path. There can be multiple sources for a single SMB device.

/sys/bus/coresight/devices/ultra_smb<N>/mgmt/buf_size

Defined on file sysfs-bus-coresight-devices-ultra_smb

(RO) Shows the buffer size of each UltraSoc SMB device.

/sys/bus/coresight/devices/ultra_smb<N>/mgmt/buf_status

Defined on file sysfs-bus-coresight-devices-ultra_smb

(RO) Shows the value of UltraSoc SMB status register. BIT(0) is zero means buffer is empty.

/sys/bus/coresight/devices/ultra_smb<N>/mgmt/read_pos

Defined on file sysfs-bus-coresight-devices-ultra_smb

(RO) Shows the value of UltraSoc SMB Read Pointer register.

/sys/bus/coresight/devices/ultra_smb<N>/mgmt/write_pos

Defined on file sysfs-bus-coresight-devices-ultra_smb

(RO) Shows the value of UltraSoc SMB Write Pointer register.

/sys/bus/counter/devices/counterX/cascade_counts_enable

Defined on file sysfs-bus-counter

Indicates the cascading of Counts on Counter X.

Valid attribute values are boolean.

/sys/bus/counter/devices/counterX/cascade_counts_enable_component_id

/sys/bus/counter/devices/counterX/external_input_phase_clock_select_component_id

/sys/bus/counter/devices/counterX/countY/capture_component_id

/sys/bus/counter/devices/counterX/countY/ceiling_component_id

/sys/bus/counter/devices/counterX/countY/floor_component_id

/sys/bus/counter/devices/counterX/countY/count_mode_component_id

/sys/bus/counter/devices/counterX/countY/direction_component_id

/sys/bus/counter/devices/counterX/countY/enable_component_id

/sys/bus/counter/devices/counterX/countY/error_noise_component_id

/sys/bus/counter/devices/counterX/countY/prescaler_component_id

/sys/bus/counter/devices/counterX/countY/preset_component_id

/sys/bus/counter/devices/counterX/countY/preset_enable_component_id

/sys/bus/counter/devices/counterX/countY/signalZ_action_component_id

/sys/bus/counter/devices/counterX/countY/num_overflows_component_id

/sys/bus/counter/devices/counterX/signalY/cable_fault_component_id

/sys/bus/counter/devices/counterX/signalY/cable_fault_enable_component_id

/sys/bus/counter/devices/counterX/signalY/filter_clock_prescaler_component_id

/sys/bus/counter/devices/counterX/signalY/index_polarity_component_id

/sys/bus/counter/devices/counterX/signalY/polarity_component_id

/sys/bus/counter/devices/counterX/signalY/synchronous_mode_component_id

/sys/bus/counter/devices/counterX/signalY/frequency_component_id

Defined on file sysfs-bus-counter

Read-only attribute that indicates the component ID of the respective extension or Synapse.

/sys/bus/counter/devices/counterX/countY/capture

Defined on file sysfs-bus-counter

Historical capture of the Count Y count data.

/sys/bus/counter/devices/counterX/countY/ceiling

Defined on file sysfs-bus-counter

Count value ceiling for Count Y. This is the upper limit for the respective counter.

/sys/bus/counter/devices/counterX/countY/count

Defined on file sysfs-bus-counter

Count data of Count Y represented as a string.

/sys/bus/counter/devices/counterX/countY/count_mode

Defined on file sysfs-bus-counter

Count mode for channel Y. The ceiling and floor values for Count Y are used by the count mode where required. The following count modes are available:

normal:

Counting is continuous in either direction.

range limit:

An upper or lower limit is set, mimicking limit switches in the mechanical counterpart. The upper limit is set to the Count Y ceiling value, while the lower limit is set to the Count Y floor value. The counter freezes at count = ceiling when counting up, and at count = floor when counting down. At either of these limits, the counting is resumed only when the count direction is reversed.

non-recycle:

The counter is disabled whenever a counter overflow or underflow takes place. The counter is re-enabled when a new count value is loaded to the counter via a preset operation or direct write.

modulo-n:

A count value boundary is set between the Count Y floor value and the Count Y ceiling value. The counter is reset to the Count Y floor value at count = ceiling when counting up, while the counter is set to the Count Y ceiling value at count = floor when counting down; the counter does not freeze at the boundary points, but counts continuously throughout.

interrupt on terminal count:

The output signal is initially low, and will remain low until the counter reaches zero. The output signal then goes high and remains high until a new preset value is set.

hardware retriggerable one-shot:

The output signal is initially high. The output signal will go low by a trigger input signal, and will remain low until the counter reaches zero. The output will then go high and remain high until the next trigger. A trigger results in loading the counter to the preset value and setting the output signal low, thus starting the one-shot pulse.

rate generator:

The output signal is initially high. When the counter has decremented to 1, the output signal goes low for one clock pulse. The output signal then goes high again, the counter is reloaded to the preset value, and the process repeats in a periodic manner as such.

square wave mode:

The output signal is initially high.

If the initial count is even, the counter is decremented by two on succeeding clock pulses. When the count expires, the output signal changes value and the counter is reloaded to the preset value. The process repeats in periodic manner as such.

If the initial count is odd, the initial count minus one (an even number) is loaded and then is decremented by two on succeeding clock pulses. One clock pulse after the count expires, the output signal goes low and the counter is reloaded to the preset value minus one. Succeeding clock pulses decrement the count by two. When the count expires, the output goes high again and the counter is reloaded to the preset value minus one. The process repeats in a periodic manner as such.

software triggered strobe:

The output signal is initially high. When the count expires, the output will go low for one clock pulse and then go high again. The counting sequence is “triggered” by setting the preset value.

hardware triggered strobe:

The output signal is initially high. Counting is started by a trigger input signal. When the count expires, the output signal will go low for one clock pulse and then go high again. A trigger results in loading the counter to the preset value.

/sys/bus/counter/devices/counterX/countY/count_mode_available

/sys/bus/counter/devices/counterX/countY/error_noise_available

/sys/bus/counter/devices/counterX/countY/function_available

/sys/bus/counter/devices/counterX/countY/prescaler_available

/sys/bus/counter/devices/counterX/countY/signalZ_action_available

Defined on file sysfs-bus-counter

Discrete set of available values for the respective Count Y configuration are listed in this file. Values are delimited by newline characters.

/sys/bus/counter/devices/counterX/countY/direction

Defined on file sysfs-bus-counter

Read-only attribute that indicates the count direction of Count Y. Two count directions are available: forward and backward.

Some counter devices are able to determine the direction of their counting. For example, quadrature encoding counters can determine the direction of movement by evaluating the leading phase of the respective A and B quadrature encoding signals. This attribute exposes such count directions.

/sys/bus/counter/devices/counterX/countY/enable

Defined on file sysfs-bus-counter

Whether channel Y counter is enabled. Valid attribute values are boolean.

This attribute is intended to serve as a pause/unpause mechanism for Count Y. Suppose a counter device is used to count the total movement of a conveyor belt: this attribute allows an operator to temporarily pause the counter, service the conveyor belt, and then finally unpause the counter to continue where it had left off.

/sys/bus/counter/devices/counterX/countY/error_noise

Defined on file sysfs-bus-counter

Read-only attribute that indicates whether excessive noise is present at the channel Y counter inputs.

/sys/bus/counter/devices/counterX/countY/floor

Defined on file sysfs-bus-counter

Count value floor for Count Y. This is the lower limit for the respective counter.

/sys/bus/counter/devices/counterX/countY/function

Defined on file sysfs-bus-counter

Count function mode of Count Y; count function evaluation is triggered by conditions specified by the Count Y signalZ_action attributes. The following count functions are available:

increase:

Accumulated count is incremented.

decrease:

Accumulated count is decremented.

pulse-direction:

Rising edges on signal A updates the respective count. The input level of signal B determines direction.

quadrature x1 a:

If direction is forward, rising edges on quadrature pair signal A updates the respective count; if the direction is backward, falling edges on quadrature pair signal A updates the respective count. Quadrature encoding determines the direction.

quadrature x1 b:

If direction is forward, rising edges on quadrature pair signal B updates the respective count; if the direction is backward, falling edges on quadrature pair signal B updates the respective count. Quadrature encoding determines the direction.

quadrature x2 a:

Any state transition on quadrature pair signal A updates the respective count. Quadrature encoding determines the direction.

quadrature x2 b:

Any state transition on quadrature pair signal B updates the respective count. Quadrature encoding determines the direction.

quadrature x4:

Any state transition on either quadrature pair signals updates the respective count. Quadrature encoding determines the direction.

/sys/bus/counter/devices/counterX/countY/name

Defined on file sysfs-bus-counter

Read-only attribute that indicates the device-specific name of Count Y. If possible, this should match the name of the respective channel as it appears in the device datasheet.

/sys/bus/counter/devices/counterX/countY/num_overflows

Defined on file sysfs-bus-counter

This attribute indicates the number of overflows of count Y.

/sys/bus/counter/devices/counterX/countY/prescaler

Defined on file sysfs-bus-counter

Configure the prescaler value associated with Count Y. On the FlexTimer, the counter clock source passes through a prescaler (i.e. a counter). This acts like a clock divider.

/sys/bus/counter/devices/counterX/countY/preset

Defined on file sysfs-bus-counter

If the counter device supports preset registers -- registers used to load counter channels to a set count upon device-defined preset operation trigger events -- the preset count for channel Y is provided by this attribute.

/sys/bus/counter/devices/counterX/countY/preset_enable

Defined on file sysfs-bus-counter

Whether channel Y counter preset operation is enabled. Valid attribute values are boolean.

/sys/bus/counter/devices/counterX/countY/signalZ_action

Defined on file sysfs-bus-counter

Action mode of Count Y for Signal Z. This attribute indicates the condition of Signal Z that triggers the count function evaluation for Count Y. The following action modes are available:

none:

Signal does not trigger the count function. In Pulse-Direction count function mode, this Signal is evaluated as Direction.

rising edge:

Low state transitions to high state.

falling edge:

High state transitions to low state.

both edges:

Any state transition.

/sys/bus/counter/devices/counterX/countY/spike_filter_ns

Defined on file sysfs-bus-counter

If the counter device supports programmable spike filter this attribute indicates the value in nanoseconds where noise pulses shorter or equal to configured value are ignored. Value 0 means filter is disabled.

/sys/bus/counter/devices/counterX/events_queue_size

Defined on file sysfs-bus-counter

Size of the Counter events queue in number of struct counter_event data structures. The number of elements will be rounded-up to a power of 2.

/sys/bus/counter/devices/counterX/external_input_phase_clock_select

Defined on file sysfs-bus-counter

Selects the external clock pin for phase counting mode of Counter X.

MTCLKA-MTCLKB:

MTCLKA and MTCLKB pins are selected for the external phase clock.

MTCLKC-MTCLKD:

MTCLKC and MTCLKD pins are selected for the external phase clock.

/sys/bus/counter/devices/counterX/external_input_phase_clock_select_available

Defined on file sysfs-bus-counter

Discrete set of available values for the respective device configuration are listed in this file.

/sys/bus/counter/devices/counterX/name

Defined on file sysfs-bus-counter

Read-only attribute that indicates the device-specific name of the Counter. This should match the name of the device as it appears in its respective datasheet.

/sys/bus/counter/devices/counterX/num_counts

Defined on file sysfs-bus-counter

Read-only attribute that indicates the total number of Counts belonging to the Counter.

/sys/bus/counter/devices/counterX/num_signals

Defined on file sysfs-bus-counter

Read-only attribute that indicates the total number of Signals belonging to the Counter.

/sys/bus/counter/devices/counterX/signalY/cable_fault

Defined on file sysfs-bus-counter

Read-only attribute that indicates whether a differential encoder cable fault (not connected or loose wires) is detected for the respective channel of Signal Y. Valid attribute values are boolean. Detection must first be enabled via the corresponding cable_fault_enable attribute.

/sys/bus/counter/devices/counterX/signalY/cable_fault_enable

Defined on file sysfs-bus-counter

Whether detection of differential encoder cable faults for the respective channel of Signal Y is enabled. Valid attribute values are boolean.

/sys/bus/counter/devices/counterX/signalY/filter_clock_prescaler

Defined on file sysfs-bus-counter

Filter clock factor for input Signal Y. This prescaler value affects the inputs of both quadrature pair signals.

/sys/bus/counter/devices/counterX/signalY/frequency

Defined on file sysfs-bus-counter

Read-only attribute that indicates the signal Y frequency, in Hz.

/sys/bus/counter/devices/counterX/signalY/index_polarity

Defined on file sysfs-bus-counter

Active level of index input Signal Y; irrelevant in non-synchronous load mode.

/sys/bus/counter/devices/counterX/signalY/index_polarity_available

/sys/bus/counter/devices/counterX/signalY/synchronous_mode_available

Defined on file sysfs-bus-counter

Discrete set of available values for the respective Signal Y configuration are listed in this file.

/sys/bus/counter/devices/counterX/signalY/name

Defined on file sysfs-bus-counter

Read-only attribute that indicates the device-specific name of Signal Y. If possible, this should match the name of the respective signal as it appears in the device datasheet.

/sys/bus/counter/devices/counterX/signalY/polarity

Defined on file sysfs-bus-counter

Active level of Signal Y. The following polarity values are available:

positive:

Signal high state considered active level (rising edge).

negative:

Signal low state considered active level (falling edge).

/sys/bus/counter/devices/counterX/signalY/signal

Defined on file sysfs-bus-counter

Signal level state of Signal Y. The following signal level states are available:

low:

Low level state.

high:

High level state.

/sys/bus/counter/devices/counterX/signalY/synchronous_mode

Defined on file sysfs-bus-counter

Configure the counter associated with Signal Y for non-synchronous or synchronous load mode. Synchronous load mode cannot be selected in non-quadrature (Pulse-Direction) clock mode.

non-synchronous:

A logic low level is the active level at this index input. The index function (as enabled via preset_enable) is performed directly on the active level of the index input.

synchronous:

Intended for interfacing with encoder Index output in quadrature clock mode. The active level is configured via index_polarity. The index function (as enabled via preset_enable) is performed synchronously with the quadrature clock on the active level of the index input.

/sys/bus/css/devices/.../driver_override

Defined on file sysfs-bus-css

This file allows the driver for a device to be specified. When specified, only a driver with a name matching the value written to driver_override will have an opportunity to bind to the device. The override is specified by writing a string to the driver_override file (echo vfio-ccw > driver_override) and may be cleared with an empty string (echo > driver_override). This returns the device to standard matching rules binding. Writing to driver_override does not automatically unbind the device from its current driver or make any attempt to automatically load the specified driver. If no driver with a matching name is currently loaded in the kernel, the device will not bind to any driver. This also allows devices to opt-out of driver binding using a driver_override name such as “none”. Only a single driver may be specified in the override, there is no support for parsing delimiters.

Note that unlike the mechanism of the same name for pci, this file does not allow to override basic matching rules. I.e., the driver must still match the subchannel type of the device.

/sys/bus/css/devices/.../modalias

Defined on file sysfs-bus-css

Contains the module alias as reported with uevents. It is of the format css:t<type> and present for all subchannel types.

/sys/bus/css/devices/.../type

Defined on file sysfs-bus-css

Contains the subchannel type, as reported by the hardware. This attribute is present for all subchannel types.

/sys/bus/css/drivers/io_subchannel/.../chpids

Defined on file sysfs-bus-css

Contains the ids of the channel paths used by this subchannel, as reported by the channel subsystem during subchannel recognition.

Note: This is an I/O-subchannel specific attribute.

Users: s390-tools, HAL

/sys/bus/css/drivers/io_subchannel/.../pimpampom

Defined on file sysfs-bus-css

Contains the PIM/PAM/POM values, as reported by the channel subsystem when last queried by the common I/O layer (this implies that this attribute is not necessarily in sync with the values current in the channel subsystem).

Note: This is an I/O-subchannel specific attribute.

Users: s390-tools, HAL

/sys/bus/cxl/devices/*/devtype

Defined on file sysfs-bus-cxl

(RO) CXL device objects export the devtype attribute which mirrors the same value communicated in the DEVTYPE environment variable for uevents for devices on the “cxl” bus.

/sys/bus/cxl/devices/*/modalias

Defined on file sysfs-bus-cxl

(RO) CXL device objects export the modalias attribute which mirrors the same value communicated in the MODALIAS environment variable for uevents for devices on the “cxl” bus.

/sys/bus/cxl/devices/decoderX.Y

Defined on file sysfs-bus-cxl

(RO) CXL decoder objects are enumerated from either a platform firmware description, or a CXL HDM decoder register set in a PCIe device (see CXL 2.0 section 8.2.5.12 CXL HDM Decoder Capability Structure). The ‘X’ in decoderX.Y represents the cxl_port container of this decoder, and ‘Y’ represents the instance id of a given decoder resource.

/sys/bus/cxl/devices/decoderX.Y/cap_{pmem,ram,type2,type3}

Defined on file sysfs-bus-cxl

(RO) When a CXL decoder is of devtype “cxl_decoder_root”, it represents a fixed memory window identified by platform firmware. A fixed window may only support a subset of memory types. The ‘cap_*’ attributes indicate whether persistent memory, volatile memory, accelerator memory, and / or expander memory may be mapped behind this decoder’s memory window.

/sys/bus/cxl/devices/decoderX.Y/create_{pmem,ram}_region

Defined on file sysfs-bus-cxl

(RW) Write a string in the form ‘regionZ’ to start the process of defining a new persistent, or volatile memory region (interleave-set) within the decode range bounded by root decoder ‘decoderX.Y’. The value written must match the current value returned from reading this attribute. An atomic compare exchange operation is done on write to assign the requested id to a region and allocate the region-id for the next creation attempt. EBUSY is returned if the region name written does not match the current cached value.

/sys/bus/cxl/devices/decoderX.Y/delete_region

Defined on file sysfs-bus-cxl

(WO) Write a string in the form ‘regionZ’ to delete that region, provided it is currently idle / not bound to a driver.

/sys/bus/cxl/devices/decoderX.Y/dpa_resource

Defined on file sysfs-bus-cxl

(RO) When a CXL decoder is of devtype “cxl_decoder_endpoint”, and its ‘dpa_size’ attribute is non-zero, this attribute indicates the device physical address (DPA) base address of the allocation.

/sys/bus/cxl/devices/decoderX.Y/dpa_size

Defined on file sysfs-bus-cxl

(RW) When a CXL decoder is of devtype “cxl_decoder_endpoint” it translates from a host physical address range, to a device local address range. The range, base address plus length in bytes, of DPA allocated to this decoder is conveyed in these 2 attributes. Allocations can be mutated as long as the decoder is in the disabled state. A write to ‘dpa_size’ releases the previous DPA allocation and then attempts to allocate from the free capacity in the device partition referred to by ‘decoderX.Y/mode’. Allocate and free requests can only be performed on the highest instance number disabled decoder with non-zero size. I.e. allocations are enforced to occur in increasing ‘decoderX.Y/id’ order and frees are enforced to occur in decreasing ‘decoderX.Y/id’ order.

/sys/bus/cxl/devices/decoderX.Y/interleave_granularity

Defined on file sysfs-bus-cxl

(RO) The number of consecutive bytes of host physical address space this decoder claims at address N before the decode rotates to the next target in the interleave at address N + interleave_granularity (assuming N is aligned to interleave_granularity).

/sys/bus/cxl/devices/decoderX.Y/interleave_ways

Defined on file sysfs-bus-cxl

(RO) The number of targets across which this decoder’s host physical address (HPA) memory range is interleaved. The device maps every Nth block of HPA (of size == ‘interleave_granularity’) to consecutive DPA addresses. The decoder’s position in the interleave is determined by the device’s (endpoint or switch) switch ancestry. For root decoders their interleave is specified by platform firmware and they only specify a downstream target order for host bridges.

/sys/bus/cxl/devices/decoderX.Y/locked

Defined on file sysfs-bus-cxl

(RO) CXL HDM decoders have the capability to lock the configuration until the next device reset. For decoders of devtype “cxl_decoder_root” there is no standard facility to unlock them. For decoders of devtype “cxl_decoder_switch” a secondary bus reset, of the PCIe bridge that provides the bus for this decoders uport, unlocks / resets the decoder.

/sys/bus/cxl/devices/decoderX.Y/mode

Defined on file sysfs-bus-cxl

(RW) When a CXL decoder is of devtype “cxl_decoder_endpoint” it translates from a host physical address range, to a device local address range. Device-local address ranges are further split into a ‘ram’ (volatile memory) range and ‘pmem’ (persistent memory) range. The ‘mode’ attribute emits one of ‘ram’, ‘pmem’, ‘mixed’, or ‘none’. The ‘mixed’ indication is for error cases when a decoder straddles the volatile/persistent partition boundary, and ‘none’ indicates the decoder is not actively decoding, or no DPA allocation policy has been set.

‘mode’ can be written, when the decoder is in the ‘disabled’ state, with either ‘ram’ or ‘pmem’ to set the boundaries for the next allocation.

/sys/bus/cxl/devices/decoderX.Y/qos_class

Defined on file sysfs-bus-cxl

(RO) For CXL host platforms that support “QoS Telemmetry” this root-decoder-only attribute conveys a platform specific cookie that identifies a QoS performance class for the CXL Window. This class-id can be compared against a similar “qos_class” published for each memory-type that an endpoint supports. While it is not required that endpoints map their local memory-class to a matching platform class, mismatches are not recommended and there are platform specific side-effects that may result.

/sys/bus/cxl/devices/decoderX.Y/target_list

Defined on file sysfs-bus-cxl

(RO) Display a comma separated list of the current decoder target configuration. The list is ordered by the current configured interleave order of the decoder’s dport instances. Each entry in the list is a dport id.

/sys/bus/cxl/devices/decoderX.Y/target_type

Defined on file sysfs-bus-cxl

(RO) When a CXL decoder is of devtype “cxl_decoder_switch”, it can optionally decode either accelerator memory (type-2) or expander memory (type-3). The ‘target_type’ attribute indicates the current setting which may dynamically change based on what memory regions are activated in this decode hierarchy.

/sys/bus/cxl/devices/decoderX.Y/{start,size}

Defined on file sysfs-bus-cxl

(RO) The ‘start’ and ‘size’ attributes together convey the physical address base and number of bytes mapped in the decoder’s decode window. For decoders of devtype “cxl_decoder_root” the address range is fixed. For decoders of devtype “cxl_decoder_switch” the address is bounded by the decode range of the cxl_port ancestor of the decoder’s cxl_port, and dynamically updates based on the active memory regions in that address space.

/sys/bus/cxl/devices/endpointX/CDAT

Defined on file sysfs-bus-cxl

(RO) If this sysfs entry is not present no DOE mailbox was found to support CDAT data. If it is present and the length of the data is 0 reading the CDAT data failed. Otherwise the CDAT data is reported.

/sys/bus/cxl/devices/memX/firmware/

Defined on file sysfs-bus-cxl

(RW) Firmware uploader mechanism. The different files under this directory can be used to upload and activate new firmware for CXL devices. The interfaces under this are documented in sysfs-class-firmware.

/sys/bus/cxl/devices/memX/firmware_version

Defined on file sysfs-bus-cxl

(RO) “FW Revision” string as reported by the Identify Memory Device Output Payload in the CXL-2.0 specification.

/sys/bus/cxl/devices/memX/numa_node

Defined on file sysfs-bus-cxl

(RO) If NUMA is enabled and the platform has affinitized the host PCI device for this memory device, emit the CPU node affinity for this device.

/sys/bus/cxl/devices/memX/pmem/qos_class

Defined on file sysfs-bus-cxl

(RO) For CXL host platforms that support “QoS Telemmetry” this attribute conveys a comma delimited list of platform specific cookies that identifies a QoS performance class for the persistent partition of the CXL mem device. These class-ids can be compared against a similar “qos_class” published for a root decoder. While it is not required that the endpoints map their local memory-class to a matching platform class, mismatches are not recommended and there are platform specific performance related side-effects that may result. First class-id is displayed.

/sys/bus/cxl/devices/memX/pmem/size

Defined on file sysfs-bus-cxl

(RO) “Persistent Only Capacity” as bytes. Represents the identically named field in the Identify Memory Device Output Payload in the CXL-2.0 specification.

/sys/bus/cxl/devices/memX/ram/qos_class

Defined on file sysfs-bus-cxl

(RO) For CXL host platforms that support “QoS Telemmetry” this attribute conveys a comma delimited list of platform specific cookies that identifies a QoS performance class for the volatile partition of the CXL mem device. These class-ids can be compared against a similar “qos_class” published for a root decoder. While it is not required that the endpoints map their local memory-class to a matching platform class, mismatches are not recommended and there are platform specific performance related side-effects that may result. First class-id is displayed.

/sys/bus/cxl/devices/memX/ram/size

Defined on file sysfs-bus-cxl

(RO) “Volatile Only Capacity” as bytes. Represents the identically named field in the Identify Memory Device Output Payload in the CXL-2.0 specification.

/sys/bus/cxl/devices/memX/security/sanitize

Defined on file sysfs-bus-cxl

(WO) Write a boolean ‘true’ string value to this attribute to sanitize the device to securely re-purpose or decommission it. This is done by ensuring that all user data and meta-data, whether it resides in persistent capacity, volatile capacity, or the LSA, is made permanently unavailable by whatever means is appropriate for the media type. This functionality requires the device to be disabled, that is, not actively decoding any HPA ranges. This permits avoiding explicit global CPU cache management, relying instead for it to be done when a region transitions between software programmed and hardware committed states. If this file is not present, then there is no hardware support for the operation.

What /sys/bus/cxl/devices/memX/security/erase (WO) Write a boolean ‘true’ string value to this attribute to secure erase user data by changing the media encryption keys for all user data areas of the device. This functionality requires the device to be disabled, that is, not actively decoding any HPA ranges. This permits avoiding explicit global CPU cache management, relying instead for it to be done when a region transitions between software programmed and hardware committed states. If this file is not present, then there is no hardware support for the operation.

/sys/bus/cxl/devices/memX/security/state

Defined on file sysfs-bus-cxl

(RO) Reading this file will display the CXL security state for that device. Such states can be: ‘disabled’, ‘sanitize’, when a sanitization is currently underway; or those available only for persistent memory: ‘locked’, ‘unlocked’ or ‘frozen’. This sysfs entry is select/poll capable from userspace to notify upon completion of a sanitize operation.

/sys/bus/cxl/devices/memX/serial

Defined on file sysfs-bus-cxl

(RO) 64-bit serial number per the PCIe Device Serial Number capability. Mandatory for CXL devices, see CXL 2.0 8.1.12.2 Memory Device PCIe Capabilities and Extended Capabilities.

/sys/bus/cxl/devices/memX/trigger_poison_list

Defined on file sysfs-bus-cxl

(WO) When a boolean ‘true’ is written to this attribute the memdev driver retrieves the poison list from the device. The list consists of addresses that are poisoned, or would result in poison if accessed, and the source of the poison. This attribute is only visible for devices supporting the capability. The retrieved errors are logged as kernel events when cxl_poison event tracing is enabled.

/sys/bus/cxl/devices/portX/decoders_committed

Defined on file sysfs-bus-cxl

(RO) A memory device is considered active when any of its decoders are in the “committed” state (See CXL 3.0 8.2.4.19.7 CXL HDM Decoder n Control Register). Hotplug and destructive operations like “sanitize” are blocked while device is actively decoding a Host Physical Address range. Note that this number may be elevated without any regionX objects active or even enumerated, as this may be due to decoders established by platform firwmare or a previous kernel (kexec).

/sys/bus/cxl/devices/portX/dportY

Defined on file sysfs-bus-cxl

(RO) CXL port objects are enumerated from either a platform firmware device (ACPI0017 and ACPI0016) or PCIe switch upstream port with CXL component registers. The ‘dportY’ symlink identifies one or more downstream ports that the upstream port may target in its decode of CXL memory resources. The ‘Y’ integer reflects the hardware port unique-id used in the hardware decoder target list.

/sys/bus/cxl/devices/portX/uport

Defined on file sysfs-bus-cxl

(RO) CXL port objects are enumerated from either a platform firmware device (ACPI0017 and ACPI0016) or PCIe switch upstream port with CXL component registers. The ‘uport’ symlink connects the CXL portX object to the device that published the CXL port capability.

/sys/bus/cxl/devices/regionZ/accessY/read_bandwidth

Defined on file sysfs-bus-cxl

(RO) The aggregated read or write bandwidth of the region. The number is the accumulated read or write bandwidth of all CXL memory devices that contributes to the region in MB/s. It is identical data that should appear in /sys/devices/system/node/nodeX/accessY/initiators/read_bandwidth or /sys/devices/system/node/nodeX/accessY/initiators/write_bandwidth. See stable/sysfs-devices-node. access0 provides the number to the closest initiator and access1 provides the number to the closest CPU.

/sys/bus/cxl/devices/regionZ/accessY/read_latency

Defined on file sysfs-bus-cxl

(RO) The read or write latency of the region. The number is the worst read or write latency of all CXL memory devices that contributes to the region in nanoseconds. It is identical data that should appear in /sys/devices/system/node/nodeX/accessY/initiators/read_latency or /sys/devices/system/node/nodeX/accessY/initiators/write_latency. See stable/sysfs-devices-node. access0 provides the number to the closest initiator and access1 provides the number to the closest CPU.

/sys/bus/cxl/devices/regionZ/commit

Defined on file sysfs-bus-cxl

(RW) Write a boolean ‘true’ string value to this attribute to trigger the region to transition from the software programmed state to the actively decoding in hardware state. The commit operation in addition to validating that the region is in proper configured state, validates that the decoders are being committed in spec mandated order (last committed decoder id + 1), and checks that the hardware accepts the commit request. Reading this value indicates whether the region is committed or not.

/sys/bus/cxl/devices/regionZ/interleave_granularity

Defined on file sysfs-bus-cxl

(RW) Set the number of consecutive bytes each device in the interleave set will claim. The possible interleave granularity values are determined by the CXL spec and the participating devices.

/sys/bus/cxl/devices/regionZ/interleave_ways

Defined on file sysfs-bus-cxl

(RW) Configures the number of devices participating in the region is set by writing this value. Each device will provide 1/interleave_ways of storage for the region.

/sys/bus/cxl/devices/regionZ/mode

Defined on file sysfs-bus-cxl

(RO) The mode of a region is established at region creation time and dictates the mode of the endpoint decoder that comprise the region. For more details on the possible modes see /sys/bus/cxl/devices/decoderX.Y/mode

/sys/bus/cxl/devices/regionZ/resource

Defined on file sysfs-bus-cxl

(RO) A region is a contiguous partition of a CXL root decoder address space. Region capacity is allocated by writing to the size attribute, the resulting physical address space determined by the driver is reflected here. It is therefore not useful to read this before writing a value to the size attribute.

/sys/bus/cxl/devices/regionZ/size

Defined on file sysfs-bus-cxl

(RW) System physical address space to be consumed by the region. When written trigger the driver to allocate space out of the parent root decoder’s address space. When read the size of the address space is reported and should match the span of the region’s resource attribute. Size shall be set after the interleave configuration parameters. Once set it cannot be changed, only freed by writing 0. The kernel makes no guarantees that data is maintained over an address space freeing event, and there is no guarantee that a free followed by an allocate results in the same address being allocated.

/sys/bus/cxl/devices/regionZ/target[0..N]

Defined on file sysfs-bus-cxl

(RW) Write an endpoint decoder object name to ‘targetX’ where X is the intended position of the endpoint device in the region interleave and N is the ‘interleave_ways’ setting for the region. ENXIO is returned if the write results in an impossible to map decode scenario, like the endpoint is unreachable at that position relative to the root decoder interleave. EBUSY is returned if the position in the region is already occupied, or if the region is not in a state to accept interleave configuration changes. EINVAL is returned if the object name is not an endpoint decoder. Once all positions have been successfully written a final validation for decode conflicts is performed before activating the region.

/sys/bus/cxl/devices/regionZ/uuid

Defined on file sysfs-bus-cxl

(RW) Write a unique identifier for the region. This field must be set for persistent regions and it must not conflict with the UUID of another region. For volatile ram regions this attribute is a read-only empty string.

/sys/bus/cxl/devices/{port,endpoint}X/parent_dport

Defined on file sysfs-bus-cxl

(RO) CXL port objects are instantiated for each upstream port in a CXL/PCIe switch, and for each endpoint to map the corresponding memory device into the CXL port hierarchy. When a descendant CXL port (switch or endpoint) is enumerated it is useful to know which ‘dport’ object in the parent CXL port routes to this descendant. The ‘parent_dport’ symlink points to the device representing the downstream port of a CXL switch that routes to {port,endpoint}X.

/sys/bus/cxl/flush

Defined on file sysfs-bus-cxl

(WO) If userspace manually unbinds a port the kernel schedules all descendant memdevs for unbind. Writing ‘1’ to this attribute flushes that work.

/sys/bus/dax/devices/daxX.Y/align

Defined on file sysfs-bus-dax

(RW) Provides a way to specify an alignment for a dax device. Values allowed are constrained by the physical address ranges that back the dax device, and also by arch requirements.

/sys/bus/dax/devices/daxX.Y/mapping

Defined on file sysfs-bus-dax

(WO) Provides a way to allocate a mapping range under a dax device. Specified in the format <start>-<end>.

/sys/bus/dax/devices/daxX.Y/mapping[0..N]/start

/sys/bus/dax/devices/daxX.Y/mapping[0..N]/end

/sys/bus/dax/devices/daxX.Y/mapping[0..N]/page_offset

Defined on file sysfs-bus-dax

(RO) A dax device may have multiple constituent discontiguous address ranges. These are represented by the different ‘mappingX’ subdirectories. The ‘start’ attribute indicates the start physical address for the given range. The ‘end’ attribute indicates the end physical address for the given range. The ‘page_offset’ attribute indicates the offset of the current range in the dax device.

/sys/bus/dax/devices/daxX.Y/memmap_on_memory

Defined on file sysfs-bus-dax

(RW) Control the memmap_on_memory setting if the dax device were to be hotplugged as system memory. This determines whether the ‘altmap’ for the hotplugged memory will be placed on the device being hotplugged (memmap_on_memory=1) or if it will be placed on regular memory (memmap_on_memory=0). This attribute must be set before the device is handed over to the ‘kmem’ driver (i.e. hotplugged into system-ram). Additionally, this depends on CONFIG_MHP_MEMMAP_ON_MEMORY, and a globally enabled memmap_on_memory parameter for memory_hotplug. This is typically set on the kernel command line - memory_hotplug.memmap_on_memory set to ‘true’ or ‘force’.”

/sys/bus/dax/devices/daxX.Y/numa_node

Defined on file sysfs-bus-dax

(RO) If NUMA is enabled and the platform has affinitized the backing device for this dax device, emit the CPU node affinity for this device.

/sys/bus/dax/devices/daxX.Y/resource

Defined on file sysfs-bus-dax

(RO) The resource attribute indicates the starting physical address of a dax device. In case of a device with multiple constituent ranges, it indicates the starting address of the first range.

/sys/bus/dax/devices/daxX.Y/size

Defined on file sysfs-bus-dax

(RW) The size attribute indicates the total size of a dax device. For creating subdivided dax devices, or for resizing an existing device, the new size can be written to this as part of the reconfiguration process.

/sys/bus/dax/devices/daxX.Y/target_node

Defined on file sysfs-bus-dax

(RO) The target-node attribute is the Linux numa-node that a device-dax instance may create when it is online. Prior to being online the device’s ‘numa_node’ property reflects the closest online cpu node which is the typical expectation of a device ‘numa_node’. Once it is online it becomes its own distinct numa node.

/sys/bus/dfl/devices/dfl_dev.X/feature_id

Defined on file sysfs-bus-dfl

Read-only. It returns feature identifier local to its DFL FIU type.

Format: 0x%x

/sys/bus/dfl/devices/dfl_dev.X/fec_mode

Defined on file sysfs-bus-dfl-devices-n3000-nios

Read-only. Returns the FEC mode of the 25G links of the ethernet retimers configured by Nios firmware. “rs” for Reed Solomon FEC, “kr” for Fire Code FEC, “no” for NO FEC. “not supported” if the FEC mode setting is not supported, this happens when the Nios firmware version major < 3, or no link is configured to 25G. Format: string

/sys/bus/dfl/devices/dfl_dev.X/infX_cal_fail

Defined on file sysfs-bus-dfl-devices-emif

Read-only. It indicates if the calibration failed on this memory interface. “1” for calibration failure, “0” for OK. Format: %u

/sys/bus/dfl/devices/dfl_dev.X/infX_clear

Defined on file sysfs-bus-dfl-devices-emif

Write-only. Writing “1” to this file will zero out all memory data in this memory interface. Writing of other values is invalid. Format: %u

/sys/bus/dfl/devices/dfl_dev.X/infX_init_done

Defined on file sysfs-bus-dfl-devices-emif

Read-only. It indicates if the initialization completed on this memory interface. “1” for initialization complete, “0” for not yet. Format: %u

/sys/bus/dfl/devices/dfl_dev.X/nios_fw_version

Defined on file sysfs-bus-dfl-devices-n3000-nios

Read-only. Returns the version of the Nios firmware in the FPGA. Its format is “major.minor.patch”. Format: %x.%x.%x

/sys/bus/dfl/devices/dfl_dev.X/retimer_A_mode

Defined on file sysfs-bus-dfl-devices-n3000-nios

Read-only. Returns the enumeration value of the working mode of the retimer A configured by the Nios firmware. The value is read out from shared registers filled by the Nios firmware. Now the values could be:

  • “0”: Reset

  • “1”: 4x10G

  • “2”: 4x25G

  • “3”: 2x25G

  • “4”: 2x25G+2x10G

  • “5”: 1x25G

If the Nios firmware is updated in future to support more retimer modes, more enumeration value is expected. Format: 0x%x

/sys/bus/dfl/devices/dfl_dev.X/retimer_B_mode

Defined on file sysfs-bus-dfl-devices-n3000-nios

Read-only. Returns the enumeration value of the working mode of the retimer B configured by the Nios firmware. The value format is the same as retimer_A_mode.

/sys/bus/dfl/devices/dfl_dev.X/type

Defined on file sysfs-bus-dfl

Read-only. It returns type of DFL FIU of the device. Now DFL supports 2 FIU types, 0 for FME, 1 for PORT.

Format: 0x%x

/sys/bus/drivers/corsair/<dev>/current_profile

Defined on file sysfs-driver-hid-corsair

Get/set the current selected profile. Values are from 1 to 3.

/sys/bus/drivers/corsair/<dev>/macro_mode

Defined on file sysfs-driver-hid-corsair

Get/set the current playback mode. “SW” for software mode where G-keys triggers their regular key codes. “HW” for hardware playback mode where the G-keys play their macro from the on-board memory.

/sys/bus/event_source/devices/<dev>/caps

Defined on file sysfs-bus-event_source-devices-caps

Attribute group to describe the capabilities exposed for a particular pmu. Each attribute of this group can expose information specific to a PMU, say pmu_name, so that userspace can understand some of the feature which the platform specific PMU supports.

One of the example available capability in supported platform like Intel is pmu_name, which exposes underlying CPU name known to the PMU driver.

Example output in powerpc: grep . /sys/bus/event_source/devices/cpu/caps/* /sys/bus/event_source/devices/cpu/caps/pmu_name:POWER9

The “branch_counter_nr” in the supported platform exposes the maximum number of counters which can be shown in the u64 counters of PERF_SAMPLE_BRANCH_COUNTERS, while the “branch_counter_width” exposes the width of each counter. Both of them can be used by the perf tool to parse the logged counters in each branch.

/sys/bus/event_source/devices/<dev>/format

Defined on file sysfs-bus-event_source-devices-format

Attribute group to describe the magic bits that go into perf_event_attr::config[012] for a particular pmu. Each attribute of this group defines the ‘hardware’ bitmask we want to export, so that userspace can deal with sane name/value pairs.

Userspace must be prepared for the possibility that attributes define overlapping bit ranges. For example:

attr1 = 'config:0-23'
attr2 = 'config:0-7'
attr3 = 'config:12-35'

Example: ‘config1:1,6-10,44’ Defines contents of attribute that occupies bits 1,6-10,44 of perf_event_attr::config1.

/sys/bus/event_source/devices/<pmu>/events/<event>

Defined on file sysfs-bus-event_source-devices-events

Per-pmu performance monitoring events specific to the running system

Each file (except for some of those with a ‘.’ in them, ‘.unit’ and ‘.scale’) in the ‘events’ directory describes a single performance monitoring event supported by the <pmu>. The name of the file is the name of the event.

As performance monitoring event names are case insensitive in the perf tool, the perf tool only looks for lower or upper case event names in sysfs to avoid scanning the directory. It is therefore required the name of the event here is either lower or upper case.

File contents:

<term>[=<value>][,<term>[=<value>]]...

Where <term> is one of the terms listed under /sys/bus/event_source/devices/<pmu>/format/ and <value> is a number is base-16 format with a ‘0x’ prefix (lowercase only). If a <term> is specified alone (without an assigned value), it is implied that 0x1 is assigned to that <term>.

Examples (each of these lines would be in a separate file):

event=0x2abc event=0x423,inv,cmask=0x3 domain=0x1,offset=0x8,starting_index=0xffff domain=0x1,offset=0x8,core=?

Each of the assignments indicates a value to be assigned to a particular set of bits (as defined by the format file corresponding to the <term>) in the perf_event structure passed to the perf_open syscall.

In the case of the last example, a value replacing “?” would need to be provided by the user selecting the particular event. This is referred to as “event parameterization”. Event parameters have the format ‘param=?’.

/sys/bus/event_source/devices/<pmu>/events/<event>.scale

Defined on file sysfs-bus-event_source-devices-events

Perf event scaling factors

A string representing a floating point value expressed in scientific notation to be multiplied by the event count received from the kernel to match the unit specified in the <event>.unit file.

Example:

2.3283064365386962890625e-10

This is provided to avoid performing floating point arithmetic in the kernel.

/sys/bus/event_source/devices/<pmu>/events/<event>.unit

Defined on file sysfs-bus-event_source-devices-events

Perf event units

A string specifying the English plural numerical unit that <event> (once multiplied by <event>.scale) represents.

Example:

Joules

/sys/bus/event_source/devices/dfl_fmeX/cpumask

Defined on file sysfs-bus-event_source-devices-dfl_fme

Read-only. This file always returns cpu which the PMU is bound for access to all fme pmu performance monitoring events.

/sys/bus/event_source/devices/dfl_fmeX/events

Defined on file sysfs-bus-event_source-devices-dfl_fme

Read-only. Attribute group to describe performance monitoring events specific to fme. Each attribute in this group describes a single performance monitoring event supported by this fme pmu. The name of the file is the name of the event. (See ABI/testing/sysfs-bus-event_source-devices-events).

All supported performance monitoring events are listed below.

Basic events (evtype=0x00):

clock = "event=0x00,evtype=0x00,portid=0xff"

Cache events (evtype=0x01):

cache_read_hit      = "event=0x00,evtype=0x01,portid=0xff"
cache_read_miss     = "event=0x01,evtype=0x01,portid=0xff"
cache_write_hit     = "event=0x02,evtype=0x01,portid=0xff"
cache_write_miss    = "event=0x03,evtype=0x01,portid=0xff"
cache_hold_request  = "event=0x05,evtype=0x01,portid=0xff"
cache_data_write_port_contention =
                      "event=0x06,evtype=0x01,portid=0xff"
cache_tag_write_port_contention =
                      "event=0x07,evtype=0x01,portid=0xff"
cache_tx_req_stall  = "event=0x08,evtype=0x01,portid=0xff"
cache_rx_req_stall  = "event=0x09,evtype=0x01,portid=0xff"
cache_eviction      = "event=0x0a,evtype=0x01,portid=0xff"

Fabric events (evtype=0x02):

fab_pcie0_read       = "event=0x00,evtype=0x02,portid=0xff"
fab_pcie0_write      = "event=0x01,evtype=0x02,portid=0xff"
fab_pcie1_read       = "event=0x02,evtype=0x02,portid=0xff"
fab_pcie1_write      = "event=0x03,evtype=0x02,portid=0xff"
fab_upi_read         = "event=0x04,evtype=0x02,portid=0xff"
fab_upi_write        = "event=0x05,evtype=0x02,portid=0xff"
fab_mmio_read        = "event=0x06,evtype=0x02,portid=0xff"
fab_mmio_write       = "event=0x07,evtype=0x02,portid=0xff"
fab_port_pcie0_read  = "event=0x00,evtype=0x02,portid=?"
fab_port_pcie0_write = "event=0x01,evtype=0x02,portid=?"
fab_port_pcie1_read  = "event=0x02,evtype=0x02,portid=?"
fab_port_pcie1_write = "event=0x03,evtype=0x02,portid=?"
fab_port_upi_read    = "event=0x04,evtype=0x02,portid=?"
fab_port_upi_write   = "event=0x05,evtype=0x02,portid=?"
fab_port_mmio_read   = "event=0x06,evtype=0x02,portid=?"
fab_port_mmio_write  = "event=0x07,evtype=0x02,portid=?"

VTD events (evtype=0x03):

vtd_port_read_transaction  = "event=0x00,evtype=0x03,portid=?"
vtd_port_write_transaction = "event=0x01,evtype=0x03,portid=?"
vtd_port_devtlb_read_hit   = "event=0x02,evtype=0x03,portid=?"
vtd_port_devtlb_write_hit  = "event=0x03,evtype=0x03,portid=?"
vtd_port_devtlb_4k_fill    = "event=0x04,evtype=0x03,portid=?"
vtd_port_devtlb_2m_fill    = "event=0x05,evtype=0x03,portid=?"
vtd_port_devtlb_1g_fill    = "event=0x06,evtype=0x03,portid=?"

VTD SIP events (evtype=0x04):

vtd_sip_iotlb_4k_hit  = "event=0x00,evtype=0x04,portid=0xff"
vtd_sip_iotlb_2m_hit  = "event=0x01,evtype=0x04,portid=0xff"
vtd_sip_iotlb_1g_hit  = "event=0x02,evtype=0x04,portid=0xff"
vtd_sip_slpwc_l3_hit  = "event=0x03,evtype=0x04,portid=0xff"
vtd_sip_slpwc_l4_hit  = "event=0x04,evtype=0x04,portid=0xff"
vtd_sip_rcc_hit       = "event=0x05,evtype=0x04,portid=0xff"
vtd_sip_iotlb_4k_miss = "event=0x06,evtype=0x04,portid=0xff"
vtd_sip_iotlb_2m_miss = "event=0x07,evtype=0x04,portid=0xff"
vtd_sip_iotlb_1g_miss = "event=0x08,evtype=0x04,portid=0xff"
vtd_sip_slpwc_l3_miss = "event=0x09,evtype=0x04,portid=0xff"
vtd_sip_slpwc_l4_miss = "event=0x0a,evtype=0x04,portid=0xff"
vtd_sip_rcc_miss      = "event=0x0b,evtype=0x04,portid=0xff"

/sys/bus/event_source/devices/dfl_fmeX/format

Defined on file sysfs-bus-event_source-devices-dfl_fme

Read-only. Attribute group to describe the magic bits that go into perf_event_attr.config for a particular pmu. (See ABI/testing/sysfs-bus-event_source-devices-format).

Each attribute under this group defines a bit range of the perf_event_attr.config. All supported attributes are listed below:

event  = "config:0-11"  - event ID
evtype = "config:12-15" - event type
portid = "config:16-23" - event source

For example:

fab_mmio_read = "event=0x06,evtype=0x02,portid=0xff"

It shows this fab_mmio_read is a fabric type (0x02) event with 0x06 local event id for overall monitoring (portid=0xff).

/sys/bus/event_source/devices/dmar*/cpumask

Defined on file sysfs-bus-event_source-devices-iommu

Read-only. This file always returns the CPU to which the IOMMU pmu is bound for access to all IOMMU pmu performance monitoring events.

/sys/bus/event_source/devices/dmar*/format

Defined on file sysfs-bus-event_source-devices-iommu

Read-only. Attribute group to describe the magic bits that go into perf_event_attr.config, perf_event_attr.config1 or perf_event_attr.config2 for the IOMMU pmu. (See also ABI/testing/sysfs-bus-event_source-devices-format).

Each attribute in this group defines a bit range in perf_event_attr.config, perf_event_attr.config1, or perf_event_attr.config2. All supported attributes are listed below (See the VT-d Spec 4.0 for possible attribute values):

event               = "config:0-27"   - event ID
event_group         = "config:28-31"  - event group ID

filter_requester_en = "config1:0"     - Enable Requester ID filter
filter_domain_en    = "config1:1"     - Enable Domain ID filter
filter_pasid_en     = "config1:2"     - Enable PASID filter
filter_ats_en       = "config1:3"     - Enable Address Type filter
filter_page_table_en= "config1:4"     - Enable Page Table Level filter
filter_requester_id = "config1:16-31" - Requester ID filter
filter_domain       = "config1:32-47" - Domain ID filter
filter_pasid        = "config2:0-21"  - PASID filter
filter_ats          = "config2:24-28" - Address Type filter
filter_page_table   = "config2:32-36" - Page Table Level filter

/sys/bus/event_source/devices/dsa*/cpumask

Defined on file sysfs-bus-event_source-devices-dsa

Read-only. This file always returns the cpu to which the IDXD DSA pmu is bound for access to all dsa pmu performance monitoring events.

/sys/bus/event_source/devices/dsa*/format

Defined on file sysfs-bus-event_source-devices-dsa

Read-only. Attribute group to describe the magic bits that go into perf_event_attr.config or perf_event_attr.config1 for the IDXD DSA pmu. (See also ABI/testing/sysfs-bus-event_source-devices-format).

Each attribute in this group defines a bit range in perf_event_attr.config or perf_event_attr.config1. All supported attributes are listed below (See the IDXD DSA Spec for possible attribute values):

event_category = "config:0-3"    - event category
event          = "config:4-31"   - event ID

filter_wq      = "config1:0-31"  - workqueue filter
filter_tc      = "config1:32-39" - traffic class filter
filter_pgsz    = "config1:40-43" - page size filter
filter_sz      = "config1:44-51" - transfer size filter
filter_eng     = "config1:52-59" - engine filter

/sys/bus/event_source/devices/hisi_ptt<sicl_id>_<core_id>/tune

Defined on file sysfs-bus-event_source-devices-hisi_ptt

This directory contains files for tuning the PCIe link parameters(events). Each file is named after the event of the PCIe link.

See HiSilicon PCIe Tune and Trace device for more information.

/sys/bus/event_source/devices/hisi_ptt<sicl_id>_<core_id>/tune/qos_tx_cpl

Defined on file sysfs-bus-event_source-devices-hisi_ptt

(RW) Controls the weight of Tx completion TLPs, which influence the proportion of outbound completion TLPs on the PCIe link. The available tune data is [0, 1, 2]. Writing a negative value will return an error, and out of range values will be converted to 2. The value indicates a probable level of the event.

/sys/bus/event_source/devices/hisi_ptt<sicl_id>_<core_id>/tune/qos_tx_np

Defined on file sysfs-bus-event_source-devices-hisi_ptt

(RW) Controls the weight of Tx non-posted TLPs, which influence the proportion of outbound non-posted TLPs on the PCIe link. The available tune data is [0, 1, 2]. Writing a negative value will return an error, and out of range values will be converted to 2. The value indicates a probable level of the event.

/sys/bus/event_source/devices/hisi_ptt<sicl_id>_<core_id>/tune/qos_tx_p

Defined on file sysfs-bus-event_source-devices-hisi_ptt

(RW) Controls the weight of Tx posted TLPs, which influence the proportion of outbound posted TLPs on the PCIe link. The available tune data is [0, 1, 2]. Writing a negative value will return an error, and out of range values will be converted to 2. The value indicates a probable level of the event.

/sys/bus/event_source/devices/hisi_ptt<sicl_id>_<core_id>/tune/rx_alloc_buf_level

Defined on file sysfs-bus-event_source-devices-hisi_ptt

(RW) Control the allocated buffer watermark for inbound packets. The packets will be stored in the buffer first and then transmitted either when the watermark reached or when timed out. The available tune data is [0, 1, 2]. Writing a negative value will return an error, and out of range values will be converted to 2. The value indicates a probable level of the event.

/sys/bus/event_source/devices/hisi_ptt<sicl_id>_<core_id>/tune/tx_alloc_buf_level

Defined on file sysfs-bus-event_source-devices-hisi_ptt

(RW) Control the allocated buffer watermark of outbound packets. The packets will be stored in the buffer first and then transmitted either when the watermark reached or when timed out. The available tune data is [0, 1, 2]. Writing a negative value will return an error, and out of range values will be converted to 2. The value indicates a probable level of the event.

/sys/bus/event_source/devices/hv_24x7/event_descs/<event-name>

Defined on file sysfs-bus-event_source-devices-hv_24x7

Provides the description of a particular event as provided by the firmware. If firmware does not provide a description, no file will be created.

Note that the event-name lacks the domain suffix appended for events in the events/ dir.

/sys/bus/event_source/devices/hv_24x7/event_long_descs/<event-name>

Defined on file sysfs-bus-event_source-devices-hv_24x7

Provides the “long” description of a particular event as provided by the firmware. If firmware does not provide a description, no file will be created.

Note that the event-name lacks the domain suffix appended for events in the events/ dir.

/sys/bus/event_source/devices/hv_24x7/format

Defined on file sysfs-bus-event_source-devices-hv_24x7

Read-only. Attribute group to describe the magic bits that go into perf_event_attr.config for a particular pmu. (See ABI/testing/sysfs-bus-event_source-devices-format).

Each attribute under this group defines a bit range of the perf_event_attr.config. All supported attributes are listed below:

chip = "config:16-31"
core  = "config:16-31"
domain = "config:0-3"
lpar = "config:0-15"
offset = "config:32-63"
vcpu = "config:16-31"

For example:

PM_PB_CYC =  "domain=1,offset=0x80,chip=?,lpar=0x0"

In this event, ‘?’ after chip specifies that this value will be provided by user while running this event.

/sys/bus/event_source/devices/hv_24x7/interface/catalog

Defined on file sysfs-bus-event_source-devices-hv_24x7

Provides access to the binary “24x7 catalog” provided by the hypervisor on POWER7 and 8 systems. This catalog lists events available from the powerpc “hv_24x7” pmu. Its format is documented here: https://raw.githubusercontent.com/jmesmon/catalog-24x7/master/hv-24x7-catalog.h

/sys/bus/event_source/devices/hv_24x7/interface/catalog_length

Defined on file sysfs-bus-event_source-devices-hv_24x7

A number equal to the length in bytes of the catalog. This is also extractable from the provided binary “catalog” sysfs entry.

/sys/bus/event_source/devices/hv_24x7/interface/catalog_version

Defined on file sysfs-bus-event_source-devices-hv_24x7

Exposes the “version” field of the 24x7 catalog. This is also extractable from the provided binary “catalog” sysfs entry.

/sys/bus/event_source/devices/hv_gpci/format

Defined on file sysfs-bus-event_source-devices-hv_gpci

Read-only. Attribute group to describe the magic bits that go into perf_event_attr.config for a particular pmu. (See ABI/testing/sysfs-bus-event_source-devices-format).

Each attribute under this group defines a bit range of the perf_event_attr.config. All supported attributes are listed below:

counter_info_version  = "config:16-23"
length  = "config:24-31"
partition_id  = "config:32-63"
request = "config:0-31"
sibling_part_id = "config:32-63"
hw_chip_id = "config:32-63"
offset = "config:32-63"
phys_processor_idx = "config:32-63"
secondary_index = "config:0-15"
starting_index = "config:32-63"

For example:

processor_core_utilization_instructions_completed = "request=0x94,
                      phys_processor_idx=?,counter_info_version=0x8,
                      length=8,offset=0x18"

In this event, ‘?’ after phys_processor_idx specifies this value this value will be provided by user while running this event.

/sys/bus/event_source/devices/hv_gpci/interface/collect_privileged

Defined on file sysfs-bus-event_source-devices-hv_gpci

‘0’ if the hypervisor is configured to forbid access to event counters being accumulated by other guests and to physical domain event counters.

‘1’ if that access is allowed.

/sys/bus/event_source/devices/hv_gpci/interface/expanded

Defined on file sysfs-bus-event_source-devices-hv_gpci

0 or 1. Indicates whether we have access to “EXPANDED” events (listed in arch/powerpc/perf/hv-gpci.h).

/sys/bus/event_source/devices/hv_gpci/interface/ga

Defined on file sysfs-bus-event_source-devices-hv_gpci

0 or 1. Indicates whether we have access to “GA” events (listed in arch/powerpc/perf/hv-gpci.h).

/sys/bus/event_source/devices/hv_gpci/interface/kernel_version

Defined on file sysfs-bus-event_source-devices-hv_gpci

A number indicating the latest version of the gpci interface that the kernel is aware of.

/sys/bus/event_source/devices/hv_gpci/interface/lab

Defined on file sysfs-bus-event_source-devices-hv_gpci

0 or 1. Indicates whether we have access to “LAB” events (listed in arch/powerpc/perf/hv-gpci.h).

/sys/bus/event_source/devices/hv_gpci/interface/version

Defined on file sysfs-bus-event_source-devices-hv_gpci

A number indicating the version of the gpci interface that the hypervisor reports supporting.

/sys/bus/event_source/devices/nmemX/cpumask

Defined on file sysfs-bus-nvdimm

(RO) This sysfs file exposes the cpumask which is designated to to retrieve nvdimm pmu event counter data.

/sys/bus/event_source/devices/nmemX/events

Defined on file sysfs-bus-nvdimm

(RO) Attribute group to describe performance monitoring events for the nvdimm memory device. Each attribute in this group describes a single performance monitoring event supported by this nvdimm pmu. The name of the file is the name of the event. (See ABI/testing/sysfs-bus-event_source-devices-events). A listing of the events supported by a given nvdimm provider type can be found in Documentation/driver-api/nvdimm/$provider.

/sys/bus/event_source/devices/nmemX/format

Defined on file sysfs-bus-nvdimm

(RO) Attribute group to describe the magic bits that go into perf_event_attr.config for a particular pmu. (See ABI/testing/sysfs-bus-event_source-devices-format).

Each attribute under this group defines a bit range of the perf_event_attr.config. Supported attribute is listed below:

event  = "config:0-4"  - event ID

For example:

ctl_res_cnt = "event=0x1"

/sys/bus/event_source/devices/uncore_*/alias

Defined on file sysfs-bus-event_source-devices-uncore

Read-only. An attribute to describe the alias name of the uncore PMU if an alias exists on some platforms. The ‘perf(1)’ tool should treat both names the same. They both can be used to access the uncore PMU.

Example:

$ cat /sys/devices/uncore_cha_2/alias uncore_type_0_2

/sys/bus/fcoe/

Defined on file sysfs-bus-fcoe

The FCoE bus. Attributes in this directory are control interfaces.

Attributes:

ctlr_create:

‘FCoE Controller’ instance creation interface. Writing an <ifname> to this file will allocate and populate sysfs with a fcoe_ctlr_device (ctlr_X). The user can then configure any per-port settings and finally write to the fcoe_ctlr_device’s ‘start’ attribute to begin the kernel’s discovery and login process.

ctlr_destroy:

‘FCoE Controller’ instance removal interface. Writing a fcoe_ctlr_device’s sysfs name to this file will log the fcoe_ctlr_device out of the fabric or otherwise connected FCoE devices. It will also free all kernel memory allocated for this fcoe_ctlr_device and any structures associated with it, this includes the scsi_host.

/sys/bus/fcoe/devices/ctlr_X

Defined on file sysfs-bus-fcoe

‘FCoE Controller’ instances on the fcoe bus. The FCoE Controller now has a three stage creation process. 1) Write interface name to ctlr_create 2) Configure the FCoE Controller (ctlr_X) 3) Enable the FCoE Controller to begin discovery and login. The FCoE Controller is destroyed by writing its name, i.e. ctlr_X to the ctlr_delete file.

Attributes:

fcf_dev_loss_tmo:

Device loss timeout period (see below). Changing this value will change the dev_loss_tmo for all FCFs discovered by this controller.

mode:

Display or change the FCoE Controller’s mode. Possible modes are ‘Fabric’ and ‘VN2VN’. If a FCoE Controller is started in ‘Fabric’ mode then FIP FCF discovery is initiated and ultimately a fabric login is attempted. If a FCoE Controller is started in ‘VN2VN’ mode then FIP VN2VN discovery and login is performed. A FCoE Controller only supports one mode at a time.

enabled:

Whether an FCoE controller is enabled or disabled. 0 if disabled, 1 if enabled. Writing either 0 or 1 to this file will enable or disable the FCoE controller.

lesb/link_fail:

Link Error Status Block (LESB) link failure count.

lesb/vlink_fail:

Link Error Status Block (LESB) virtual link failure count.

lesb/miss_fka:

Link Error Status Block (LESB) missed FCoE Initialization Protocol (FIP) Keep-Alives (FKA).

lesb/symb_err:

Link Error Status Block (LESB) symbolic error count.

lesb/err_block:

Link Error Status Block (LESB) block error count.

lesb/fcs_error:

Link Error Status Block (LESB) Fibre Channel Services error count.

Notes: ctlr_X (global increment starting at 0)

/sys/bus/fcoe/devices/fcf_X

Defined on file sysfs-bus-fcoe

‘FCoE FCF’ instances on the fcoe bus. A FCF is a Fibre Channel Forwarder, which is a FCoE switch that can accept FCoE (Ethernet) packets, unpack them, and forward the embedded Fibre Channel frames into a FC fabric. It can also take outbound FC frames and pack them in Ethernet packets to be sent to their destination on the Ethernet segment.

Attributes:

fabric_name:

Identifies the fabric that the FCF services.

switch_name:

Identifies the FCF.

priority:

The switch’s priority amongst other FCFs on the same fabric.

selected:

1 indicates that the switch has been selected for use; 0 indicates that the switch will not be used.

fc_map:

The Fibre Channel MAP

vfid:

The Virtual Fabric ID

mac:

The FCF’s MAC address

fka_period:

The FIP Keep-Alive period

fabric_state: The internal kernel state

  • “Unknown” - Initialization value

  • “Disconnected” - No link to the FCF/fabric

  • “Connected” - Host is connected to the FCF

  • “Deleted” - FCF is being removed from the system

dev_loss_tmo: The device loss timeout period for this FCF.

Notes: A device loss infrastructure similar to the FC Transport’s

is present in fcoe_sysfs. It is nice to have so that a link flapping adapter doesn’t continually advance the count used to identify the discovered FCF. FCFs will exist in a “Disconnected” state until either the timer expires and the FCF becomes “Deleted” or the FCF is rediscovered and becomes “Connected.”

Users: The first user of this interface will be the fcoeadm application, which is commonly packaged in the fcoe-utils package.

/sys/bus/fsi/devices/XX.XX.00:06/sbefifoX/timeout

Defined on file sysfs-bus-fsi-devices-sbefifo

Indicates whether or not this SBE device has experienced a timeout; i.e. the SBE did not respond within the time allotted by the driver. A value of 1 indicates that a timeout has occurred and no transfers have completed since the timeout. A value of 0 indicates that no timeout has occurred, or if one has, more recent transfers have completed successfully.

/sys/bus/fsl-mc/drivers/.../bind

Defined on file sysfs-bus-fsl-mc

Writing a device location to this file will cause the driver to attempt to bind to the device found at this location. The format for the location is Object.Id and is the same as found in /sys/bus/fsl-mc/devices/.

For example:

# echo dpni.2 > /sys/bus/fsl-mc/drivers/fsl_dpaa2_eth/bind

/sys/bus/fsl-mc/drivers/.../unbind

Defined on file sysfs-bus-fsl-mc

Writing a device location to this file will cause the driver to attempt to unbind from the device found at this location. The format for the location is Object.Id and is the same as found in /sys/bus/fsl-mc/devices/.

For example:

# echo dpni.2 > /sys/bus/fsl-mc/drivers/fsl_dpaa2_eth/unbind

/sys/bus/hid/devices/<bus>:<vid>:<pid>.<n>/speed

Defined on file sysfs-driver-wacom

The /sys/bus/hid/devices/<bus>:<vid>:<pid>.<n>/speed file controls reporting speed of Wacom bluetooth tablet. Reading from this file returns 1 if tablet reports in high speed mode or 0 otherwise. Writing to this file one of these values switches reporting speed.

/sys/bus/hid/devices/<bus>:<vid>:<pid>.<n>/wacom_led/button<n>_rawimg

Defined on file sysfs-driver-wacom

When writing a 1024 byte raw image in Wacom Intuos 4 interleaving format to the file, the image shows up on Button N of the device. The image is a 64x32 pixel 4-bit gray image. The 1024 byte binary is split up into 16x 64 byte chunks. Each 64 byte chunk encodes the image data for two consecutive lines on the display. The low nibble of each byte contains the first line, and the high nibble contains the second line. When the Wacom Intuos 4 is connected over Bluetooth, the image has to contain 256 bytes (64x32 px 1 bit colour). The format is also scrambled, like in the USB mode, and it can be summarized by converting:

76543210 into GECA6420.
HGFEDCBA      HFDB7531

/sys/bus/hid/devices/<bus>:<vid>:<pid>.<n>/wacom_led/buttons_luminance

Defined on file sysfs-driver-wacom

Writing to this file sets the overall luminance level (0..15) of all eight button OLED displays.

/sys/bus/hid/devices/<bus>:<vid>:<pid>.<n>/wacom_led/led

Defined on file sysfs-driver-wacom

Attribute group for control of the status LEDs and the OLEDs. This attribute group is only available for Intuos 4 M, L, and XL (with LEDs and OLEDs), Intuos 4 WL, Intuos 5 (LEDs only), Intuos Pro (LEDs only) and Cintiq 21UX2 and Cintiq 24HD (LEDs only). Therefore its presence implicitly signifies the presence of said LEDs and OLEDs on the tablet device.

/sys/bus/hid/devices/<bus>:<vid>:<pid>.<n>/wacom_led/status0_luminance

Defined on file sysfs-driver-wacom

<obsoleted by the LED class API now exported by the driver> Writing to this file sets the status LED luminance (1..127) when the stylus does not touch the tablet surface, and no button is pressed on the stylus. This luminance level is normally lower than the level when a button is pressed.

/sys/bus/hid/devices/<bus>:<vid>:<pid>.<n>/wacom_led/status1_luminance

Defined on file sysfs-driver-wacom

<obsoleted by the LED class API now exported by the driver> Writing to this file sets the status LED luminance (1..127) when the stylus touches the tablet surface, or any button is pressed on the stylus.

/sys/bus/hid/devices/<bus>:<vid>:<pid>.<n>/wacom_led/status_led0_select

Defined on file sysfs-driver-wacom

<obsoleted by the LED class API now exported by the driver> Writing to this file sets which one of the four (for Intuos 4 and Intuos 5) or of the right four (for Cintiq 21UX2 and Cintiq 24HD) status LEDs is active (0..3). The other three LEDs on the same side are always inactive.

/sys/bus/hid/devices/<bus>:<vid>:<pid>.<n>/wacom_led/status_led1_select

Defined on file sysfs-driver-wacom

<obsoleted by the LED class API now exported by the driver> Writing to this file sets which one of the left four (for Cintiq 21UX2 and Cintiq 24HD) status LEDs is active (0..3). The other three LEDs on the left are always inactive.

/sys/bus/hid/devices/<bus>:<vid>:<pid>.<n>/wacom_remote/<serial_number>/remote_mode

Defined on file sysfs-driver-wacom

<obsoleted by the LED class API now exported by the driver> Reading from this file reports the mode status of the remote as indicated by the LED lights on the device. If no reports have been received from the paired device, reading from this file will report ‘-1’. The mode is read-only and cannot be set through the driver.

/sys/bus/hid/devices/<bus>:<vid>:<pid>.<n>/wacom_remote/unpair_remote

Defined on file sysfs-driver-wacom

Writing the character sequence ‘*’ followed by a newline to this file will delete all of the current pairings on the device. Other character sequences are reserved. This file is write only.

/sys/bus/hid/drivers/logitech-hidpp-device/<dev>/builtin_power_supply

Defined on file sysfs-driver-hid-logitech-hidpp

Presence of this file indicates that HID++ driver is capable of handling battery properties in the kernel. This way, upower can add a udev rule to decide whether or not it should use the internal unifying support or the generic kernel one.

/sys/bus/hid/drivers/logitech-hidpp-device/<dev>/range

Defined on file sysfs-driver-hid-logitech-hidpp

(RW) This attribute controls the amount of ‘turn’ permitted in Logitech G920 wheel. Reading from the file shows the current range of the steering wheel. Writing a value within the min and max boundary sets the range of the wheel.

/sys/bus/hid/drivers/logitech/<dev>/alternate_modes

Defined on file sysfs-driver-hid-logitech-lg4ff

Displays a set of alternate modes supported by a wheel. Each mode is listed as follows:

Tag: Mode Name

Currently active mode is marked with an asterisk. List also contains an abstract item “native” which always denotes the native mode of the wheel. Echoing the mode tag switches the wheel into the corresponding mode. Depending on the exact model of the wheel not all listed modes might always be selectable. If a wheel cannot be switched into the desired mode, -EINVAL is returned accompanied with an explanatory message in the kernel log. This entry is not created for devices that have only one mode.

Currently supported mode switches:

Driving Force Pro:

DF-EX --> DFP

G25:

DF-EX --> DFP --> G25

G27:

DF-EX <*> DFP <-> G25 <-> G27
DF-EX <*--------> G25 <-> G27
DF-EX <*----------------> G27

G29:

DF-EX <*> DFP <-> G25 <-> G27 <-> G29
DF-EX <*--------> G25 <-> G27 <-> G29
DF-EX <*----------------> G27 <-> G29
DF-EX <*------------------------> G29

DFGT:

DF-EX <*> DFP <-> DFGT
DF-EX <*--------> DFGT

  • hid_logitech module must be loaded with lg4ff_no_autoswitch=1 parameter set in order for the switch to DF-EX mode to work.

/sys/bus/hid/drivers/logitech/<dev>/combine_pedals

Defined on file sysfs-driver-hid-logitech-lg4ff

Controls whether a combined value of accelerator and brake is reported on the Y axis of the controller. Useful for older games which can do not work with separate accelerator/brake axis. Off (‘0’) by default, enabled by setting ‘1’.

/sys/bus/hid/drivers/logitech/<dev>/range

Defined on file sysfs-driver-hid-logitech-lg4ff

Display minimum, maximum and current range of the steering wheel. Writing a value within min and max boundaries sets the range of the wheel.

/sys/bus/hid/drivers/logitech/<dev>/real_id

Defined on file sysfs-driver-hid-logitech-lg4ff

Displays the real model of the wheel regardless of any alternate mode the wheel might be switched to. It is a read-only value. This entry is not created for devices that have only one mode.

/sys/bus/hid/drivers/ntrig/<dev>/activate_slack

Defined on file sysfs-driver-hid-ntrig

(RW) Number of contact frames ignored before acknowledging the start of activity (activating touch).

/sys/bus/hid/drivers/ntrig/<dev>/activation_width

/sys/bus/hid/drivers/ntrig/<dev>/activation_height

Defined on file sysfs-driver-hid-ntrig

Threholds to override activation slack.

activation_width

(RW) Width threshold to immediately start processing touch events.

activation_height

(RW) Height threshold to immediately start processing touch events.

/sys/bus/hid/drivers/ntrig/<dev>/decativate_slack

Defined on file sysfs-driver-hid-ntrig

(RW) Number of empty (no contact) frames ignored before acknowledging the end of activity (deactivating touch).

When the last finger is removed from the device, it sends a number of empty frames. By holding off on deactivation for a few frames false erroneous disconnects can be tolerated, where the sensor may mistakenly not detect a finger that is still present.

/sys/bus/hid/drivers/ntrig/<dev>/min_width

/sys/bus/hid/drivers/ntrig/<dev>/min_height

Defined on file sysfs-driver-hid-ntrig

Minimum size contact accepted.

min_width

(RW) Minimum touch contact width to decide activation and activity.

min_height

(RW) Minimum touch contact height to decide activation and activity.

/sys/bus/hid/drivers/ntrig/<dev>/sensor_logical_width

/sys/bus/hid/drivers/ntrig/<dev>/sensor_logical_height

Defined on file sysfs-driver-hid-ntrig

(RO) The range for positions reported during activity.

/sys/bus/hid/drivers/ntrig/<dev>/sensor_physical_width

/sys/bus/hid/drivers/ntrig/<dev>/sensor_physical_height

Defined on file sysfs-driver-hid-ntrig

(RO) These are internal ranges not used for normal events but useful for tuning.

/sys/bus/hid/drivers/prodikeys/.../channel

Defined on file sysfs-driver-hid-prodikeys

Allows control (via software) the midi channel to which that the pc-midi keyboard will output.midi data. Range: 0..15 Type: Read/write

/sys/bus/hid/drivers/prodikeys/.../octave

Defined on file sysfs-driver-hid-prodikeys

Controls the octave shift modifier in the pc-midi driver. The octave can be shifted via software up/down 2 octaves. 0 means the no ocatve shift. Range: -2..2 (minus 2 to plus 2) Type: Read/Write

/sys/bus/hid/drivers/prodikeys/.../sustain

Defined on file sysfs-driver-hid-prodikeys

Allows control (via software) the sustain duration of a note held by the pc-midi driver. 0 means sustain mode is disabled. Range: 0..5000 (milliseconds) Type: Read/write

/sys/bus/hid/drivers/wiimote/<dev>/bboard_calib

Defined on file sysfs-driver-hid-wiimote

This attribute is only provided if the device was detected as a balance board. It provides a single line with 3 calibration values for all 4 sensors. The values are separated by colons and are each 2 bytes long (encoded as 4 digit hexadecimal value). First, 0kg values for all 4 sensors are written, followed by the 17kg values for all 4 sensors and last the 34kg values for all 4 sensors.

Calibration data is already applied by the kernel to all input values but may be used by user-space to perform other transformations.

/sys/bus/hid/drivers/wiimote/<dev>/devtype

Defined on file sysfs-driver-hid-wiimote

While a device is initialized by the wiimote driver, we perform a device detection and signal a “change” uevent after it is done. This file shows the detected device type. “pending” means that the detection is still ongoing, “unknown” means, that the device couldn’t be detected or loaded. “generic” means, that the device couldn’t be detected but supports basic Wii Remote features and can be used. Other strings for each device-type are available and may be added if new device-specific detections are added. Currently supported are:

gen10:

First Wii Remote generation

gen20:

Second Wii Remote Plus generation (builtin MP)

balanceboard:

Wii Balance Board

/sys/bus/hid/drivers/wiimote/<dev>/extension

Defined on file sysfs-driver-hid-wiimote

This file contains the currently connected and initialized extensions. It can be one of: none, motionp, nunchuck, classic, motionp+nunchuck, motionp+classic motionp is the official Nintendo Motion+ extension, nunchuck is the official Nintendo Nunchuck extension and classic is the Nintendo Classic Controller extension. The motionp extension can be combined with the other two.

Starting with kernel-version 3.11 Motion Plus hotplugging is supported and if detected, it’s no longer reported as static extension. You will get uevent notifications for the motion-plus device then.

/sys/bus/hid/drivers/wiimote/<dev>/led1

/sys/bus/hid/drivers/wiimote/<dev>/led2

/sys/bus/hid/drivers/wiimote/<dev>/led3

/sys/bus/hid/drivers/wiimote/<dev>/led4

Defined on file sysfs-driver-hid-wiimote

Make it possible to set/get current led state. Reading from it returns 0 if led is off and 1 if it is on. Writing 0 to it disables the led, writing 1 enables it.

/sys/bus/hid/drivers/wiimote/<dev>/pro_calib

Defined on file sysfs-driver-hid-wiimote

This attribute is only provided if the device was detected as a pro-controller. It provides a single line with 4 calibration values for all 4 analog sticks. Format is: “x1:y1 x2:y2”. Data is prefixed with a +/-. Each value is a signed 16bit number. Data is encoded as decimal numbers and specifies the offsets of the analog sticks of the pro-controller.

Calibration data is already applied by the kernel to all input values but may be used by user-space to perform other transformations.

Calibration data is detected by the kernel during device setup. You can write “scann” into this file to re-trigger calibration. You can also write data directly in the form “x1:y1 x2:y2” to set the calibration values manually.

/sys/bus/hsi

Defined on file sysfs-bus-hsi

High Speed Synchronous Serial Interface (HSI) is a serial interface mainly used for connecting application engines (APE) with cellular modem engines (CMT) in cellular handsets. The bus will be populated with devices (hsi_clients) representing the protocols available in the system. Bus drivers implement those protocols.

/sys/bus/hsi/devices/.../modalias

Defined on file sysfs-bus-hsi

Stores the same MODALIAS value emitted by uevent Format: hsi:<hsi_client device name>

/sys/bus/i2c/.../idle_state

Defined on file sysfs-bus-i2c-devices-pca954x

Value that exists only for mux devices that can be written to control the behaviour of the multiplexer on idle. Possible values:

-2

disconnect on idle, i.e. deselect the last used channel, which is useful when there is a device with an address that conflicts with another device on another mux on the same parent bus.

-1

leave the mux as-is, which is the most optimal setting in terms of I2C operations and is the default mode.

0..<nchans>

set the mux to a predetermined channel, which is useful if there is one channel that is used almost always, and you want to reduce the latency for normal operations after rare transactions on other channels

/sys/bus/i2c/devices/.../bd9571mwv-regulator.*.auto/backup_mode

Defined on file sysfs-driver-bd9571mwv-regulator

Read/write the current state of DDR Backup Mode, which controls if DDR power rails will be kept powered during system suspend. (“on”/”1” = enabled, “off”/”0” = disabled). Two types of power switches (or control signals) can be used:

  1. With a momentary power switch (or pulse signal), DDR Backup Mode is enabled by default when available, as the PMIC will be configured only during system suspend.

  2. With a toggle power switch (or level signal), the following steps must be followed exactly:

    1. Configure PMIC for backup mode, to change the role of the accessory power switch from a power switch to a wake-up switch,

    2. Switch accessory power switch off, to prepare for system suspend, which is a manual step not controlled by software,

    3. Suspend system,

    4. Switch accessory power switch on, to resume the system.

    DDR Backup Mode must be explicitly enabled by the user, to invoke step 1.

See also Documentation/devicetree/bindings/mfd/rohm,bd9571mwv.yaml.

Users: User space applications for embedded boards equipped with a BD9571MWV PMIC.

/sys/bus/i2c/devices/.../calibration

Defined on file sysfs-bus-i2c-devices-hm6352

Sets the calibration on or off (1 = on, 0 = off). See the chip data sheet.

/sys/bus/i2c/devices/.../device

Defined on file sysfs-bus-i2c-devices-fsa9480

show what device is attached

NONE

no device

USB

USB device is attached

UART

UART is attached

CHARGER

Charger is attached

JIG

JIG is attached

/sys/bus/i2c/devices/.../heading0_input

Defined on file sysfs-bus-i2c-devices-hm6352

Reports the current heading from the compass as a floating point value in degrees.

/sys/bus/i2c/devices/.../output_hvled[n]

Defined on file sysfs-bus-i2c-devices-lm3533

Set the controlling backlight device for high-voltage current sink HVLED[n] (n = 1, 2) (0, 1).

/sys/bus/i2c/devices/.../output_lvled[n]

Defined on file sysfs-bus-i2c-devices-lm3533

Set the controlling led device for low-voltage current sink LVLED[n] (n = 1..5) (0..3).

/sys/bus/i2c/devices/.../power_state

Defined on file sysfs-bus-i2c-devices-hm6352

Sets the power state of the device. 0 sets the device into sleep mode, 1 wakes it up.

/sys/bus/i2c/devices/.../switch

Defined on file sysfs-bus-i2c-devices-fsa9480

show or set the state of manual switch

VAUDIO

switch to VAUDIO path

UART

switch to UART path

AUDIO

switch to AUDIO path

DHOST

switch to DHOST path

AUTO

switch automatically by device

/sys/bus/i2c/devices/.../trickle_charge_bypass

Defined on file sysfs-bus-i2c-devices-bq32k

Attribute for enable/disable the trickle charge bypass The trickle_charge_bypass attribute allows the userspace to enable/disable the Trickle charge FET bypass.

/sys/bus/i2c/devices/<mcu_device>/board_revision

Defined on file sysfs-bus-i2c-devices-turris-omnia-mcu

(RO) Contains board revision number.

Only available if board information is burned in the MCU (older revisions have board information burned in the ATSHA204-A chip).

Format: %u.

/sys/bus/i2c/devices/<mcu_device>/first_mac_address

Defined on file sysfs-bus-i2c-devices-turris-omnia-mcu

(RO) Contains device first MAC address. Each Turris Omnia is allocated 3 MAC addresses. The two additional addresses are computed from the first one by incrementing it.

Only available if board information is burned in the MCU (older revisions have board information burned in the ATSHA204-A chip).

Format: %pM.

/sys/bus/i2c/devices/<mcu_device>/front_button_mode

Defined on file sysfs-bus-i2c-devices-turris-omnia-mcu

(RW) The front button on the Turris Omnia router can be configured either to change the intensity of all the LEDs on the front panel, or to send the press event to the CPU as an interrupt.

This file switches between these two modes:

  • mcu makes the button press event be handled by the MCU to change the LEDs panel intensity.

  • cpu makes the button press event be handled by the CPU.

Format: %s.

/sys/bus/i2c/devices/<mcu_device>/front_button_poweron

Defined on file sysfs-bus-i2c-devices-turris-omnia-mcu

(RW) Newer versions of the microcontroller firmware of the Turris Omnia router support powering off the router into true low power mode. The router can be powered on by pressing the front button.

This file configures whether front button power on is enabled.

This file is present only if the power off feature is supported by the firmware.

Format: %i.

/sys/bus/i2c/devices/<mcu_device>/fw_features

Defined on file sysfs-bus-i2c-devices-turris-omnia-mcu

(RO) Newer versions of the microcontroller firmware report the features they support. These can be read from this file. If the MCU firmware is too old, this file reads 0x0.

Format: 0x%x.

/sys/bus/i2c/devices/<mcu_device>/fw_version_hash_application

Defined on file sysfs-bus-i2c-devices-turris-omnia-mcu

(RO) Contains the version hash (commit hash) of the application part of the microcontroller firmware.

Format: %s.

/sys/bus/i2c/devices/<mcu_device>/fw_version_hash_bootloader

Defined on file sysfs-bus-i2c-devices-turris-omnia-mcu

(RO) Contains the version hash (commit hash) of the bootloader part of the microcontroller firmware.

Format: %s.

/sys/bus/i2c/devices/<mcu_device>/mcu_type

Defined on file sysfs-bus-i2c-devices-turris-omnia-mcu

(RO) Contains the microcontroller type (STM32, GD32, MKL).

Format: %s.

/sys/bus/i2c/devices/<mcu_device>/reset_selector

Defined on file sysfs-bus-i2c-devices-turris-omnia-mcu

(RO) Contains the selected factory reset level, determined by how long the rear reset button was held by the user during board reset.

Format: %i.

/sys/bus/i2c/devices/<mcu_device>/serial_number

Defined on file sysfs-bus-i2c-devices-turris-omnia-mcu

(RO) Contains the 64-bit board serial number in hexadecimal format.

Only available if board information is burned in the MCU (older revisions have board information burned in the ATSHA204-A chip).

Format: %016X.

/sys/bus/i2c/devices/xxx/fw_version

Defined on file sysfs-driver-input-exc3000

Reports the firmware version provided by the touchscreen, for example “00_T6” on a EXC80H60

Access: Read

Valid values: Represented as string

/sys/bus/i2c/devices/xxx/model

Defined on file sysfs-driver-input-exc3000

Reports the model identification provided by the touchscreen, for example “Orion_1320” on a EXC80H60

Access: Read

Valid values: Represented as string

/sys/bus/i2c/devices/xxx/type

Defined on file sysfs-driver-input-exc3000

Reports the type identification provided by the touchscreen, for example “PCAP82H80 Series”

Access: Read

Valid values: Represented as string

/sys/bus/i2c/drivers/ucsi_ccg/.../do_flash

Defined on file sysfs-driver-ucsi-ccg

Tell the driver for Cypress CCGx Type-C controller to attempt firmware upgrade by writing [Yy1] to the file.

/sys/bus/i3c/devices/<bus-id>-<device-pid>

Defined on file sysfs-bus-i3c

These directories are just symbolic links to /sys/bus/i3c/devices/i3c-<bus-id>/<bus-id>-<device-pid>.

/sys/bus/i3c/devices/i3c-<bus-id>

Defined on file sysfs-bus-i3c

An I3C bus. This directory will contain one sub-directory per I3C device present on the bus.

/sys/bus/i3c/devices/i3c-<bus-id>/<bus-id>-<device-pid>

Defined on file sysfs-bus-i3c

An I3C device present on I3C bus identified by <bus-id>. Note that all devices are represented including the master driving the bus.

/sys/bus/i3c/devices/i3c-<bus-id>/<bus-id>-<device-pid>/bcr

Defined on file sysfs-bus-i3c

BCR stands for Bus Characteristics Register and express the device capabilities in term of speed, maximum read/write length, etc. See the I3C specification for more details.

/sys/bus/i3c/devices/i3c-<bus-id>/<bus-id>-<device-pid>/dcr

Defined on file sysfs-bus-i3c

DCR stands for Device Characteristics Register and express the device capabilities in term of exposed features. See the I3C specification for more details.

/sys/bus/i3c/devices/i3c-<bus-id>/<bus-id>-<device-pid>/dynamic_address

Defined on file sysfs-bus-i3c

Dynamic address assigned to device <bus-id>-<device-pid>. This address may change if the bus is re-initialized.

/sys/bus/i3c/devices/i3c-<bus-id>/<bus-id>-<device-pid>/hdrcap

Defined on file sysfs-bus-i3c

Expose the HDR (High Data Rate) capabilities of a device. Returns a list of supported HDR mode, each element is separated by space. Modes can be “hdr-ddr”, “hdr-tsp” and “hdr-tsl”.

See the I3C specification for more details about these HDR modes.

/sys/bus/i3c/devices/i3c-<bus-id>/<bus-id>-<device-pid>/pid

Defined on file sysfs-bus-i3c

PID stands for Provisioned ID and is used to uniquely identify a device on a bus. This PID contains information about the vendor, the part and an instance ID so that several devices of the same type can be connected on the same bus. See the I3C specification for more details.

/sys/bus/i3c/devices/i3c-<bus-id>/bcr

Defined on file sysfs-bus-i3c

BCR stands for Bus Characteristics Register and express the device capabilities in term of speed, maximum read/write length, etc. See the I3C specification for more details. This entry describes the BCR of the master controller driving the bus.

/sys/bus/i3c/devices/i3c-<bus-id>/current_master

Defined on file sysfs-bus-i3c

Expose the master that owns the bus (<bus-id>-<master-pid>) at the time this file is read. Note that bus ownership can change overtime, so there’s no guarantee that when the read() call returns, the value returned is still valid.

/sys/bus/i3c/devices/i3c-<bus-id>/dcr

Defined on file sysfs-bus-i3c

DCR stands for Device Characteristics Register and express the device capabilities in term of exposed features. See the I3C specification for more details. This entry describes the DCR of the master controller driving the bus.

/sys/bus/i3c/devices/i3c-<bus-id>/dynamic_address

Defined on file sysfs-bus-i3c

Dynamic address assigned to the master controller. This address may change if the bus is re-initialized.

/sys/bus/i3c/devices/i3c-<bus-id>/hdrcap

Defined on file sysfs-bus-i3c

Expose the HDR (High Data Rate) capabilities of a device. Returns a list of supported HDR mode, each element is separated by space. Modes can be “hdr-ddr”, “hdr-tsp” and “hdr-tsl”. See the I3C specification for more details about these HDR modes.

This entry describes the HDRCAP of the master controller driving the bus.

/sys/bus/i3c/devices/i3c-<bus-id>/hotjoin

Defined on file sysfs-bus-i3c

I3C’s Hot-Join mechanism allows an I3C Device to inform the Active Controller that a newly-joined Target is present on the I3C Bus and is ready to receive a Dynamic Address, in order to become fully functional on the Bus. Hot-Join is used when the Target is mounted on the same I3C bus and remains depowered until needed or until the Target is physically inserted into the I3C bus

This entry allows to enable or disable Hot-join of the Current Controller driving the bus.

/sys/bus/i3c/devices/i3c-<bus-id>/i2c_scl_frequency

Defined on file sysfs-bus-i3c

The frequency (expressed in Hz) of the SCL signal when operating in I2C mode.

/sys/bus/i3c/devices/i3c-<bus-id>/i3c_scl_frequency

Defined on file sysfs-bus-i3c

The frequency (expressed in Hz) of the SCL signal when operating in I3C SDR mode.

/sys/bus/i3c/devices/i3c-<bus-id>/mode

Defined on file sysfs-bus-i3c

I3C bus mode. Can be “pure”, “mixed-fast” or “mixed-slow”. See the I3C specification for a detailed description of what each of these modes implies.

/sys/bus/i3c/devices/i3c-<bus-id>/pid

Defined on file sysfs-bus-i3c

PID stands for Provisioned ID and is used to uniquely identify a device on a bus. This PID contains information about the vendor, the part and an instance ID so that several devices of the same type can be connected on the same bus. See the I3C specification for more details. This entry describes the PID of the master controller driving the bus.

/sys/bus/iio/devices/device[n]/in_illuminance0_calibrate

Defined on file sysfs-bus-iio-light-tsl2772

Causes an internal calibration of the als gain trim value which is later used in calculating illuminance in lux.

/sys/bus/iio/devices/device[n]/in_illuminance_calibrate

Defined on file sysfs-bus-iio-light-tsl2583

This property causes an internal calibration of the als gain trim value which is later used in calculating illuminance in lux.

/sys/bus/iio/devices/device[n]/in_illuminance_input_target

Defined on file sysfs-bus-iio-light-tsl2583

This property is the known externally illuminance (in lux). It is used in the process of calibrating the device accuracy.

/sys/bus/iio/devices/device[n]/in_illuminance_lux_table

Defined on file sysfs-bus-iio-light-tsl2583

This property gets/sets the table of coefficients used in calculating illuminance in lux.

/sys/bus/iio/devices/device[n]/in_proximity0_calibrate

Defined on file sysfs-bus-iio-light-tsl2772

Causes a recalculation and adjustment to the proximity_thresh_rising_value.

/sys/bus/iio/devices/iio:device*/buffer/hwfifo_timeout

Defined on file sysfs-bus-iio

A read/write property to provide capability to delay reporting of samples till a timeout is reached. This allows host processors to sleep, while the sensor is storing samples in its internal fifo. The maximum timeout in seconds can be specified by setting hwfifo_timeout.The current delay can be read by reading hwfifo_timeout. A value of 0 means that there is no timeout.

/sys/bus/iio/devices/iio:deviceX

Defined on file sysfs-bus-iio

Hardware chip or device accessed by one communication port. Corresponds to a grouping of sensor channels. X is the IIO index of the device.

/sys/bus/iio/devices/iio:deviceX/ac_excitation_en

Defined on file sysfs-bus-iio-adc-ad7192

This attribute, if available, is used to enable the AC excitation mode found on some converters. In ac excitation mode, the polarity of the excitation voltage is reversed on alternate cycles, to eliminate DC errors.

/sys/bus/iio/devices/iio:deviceX/auto_zeroing_mux_enable

Defined on file sysfs-bus-iio-adc-mcp3564

This attribute is used to enable the analog input multiplexer auto-zeroing algorithm (the input multiplexer and the ADC include an offset cancellation algorithm that cancels the offset contribution of the ADC). When the offset cancellation algorithm is enabled, ADC takes two conversions, one with the differential input as VIN+/VIN-, one with VIN+/VIN- inverted. In this case the conversion time is multiplied by two compared to the default case where the algorithm is disabled. This technique allows the cancellation of the ADC offset error and the achievement of ultra-low offset without any digital calibration. The resulting offset is the residue of the difference between the two conversions, which is on the order of magnitude of the noise floor. This offset is effectively canceled at every conversion, so the residual offset error temperature drift is extremely low. Write ‘1’ to enable it, write ‘0’ to disable it.

/sys/bus/iio/devices/iio:deviceX/auto_zeroing_ref_enable

Defined on file sysfs-bus-iio-adc-mcp3564

This attribute is used to enable the chopping algorithm for the internal voltage reference buffer. This setting has no effect when external voltage reference is selected. Internal voltage reference buffer injects a certain quantity of 1/f noise into the system that can be modulated with the incoming input signals and can limit the SNR performance at higher Oversampling Ratio values (over 256). To overcome this limitation, the buffer includes an auto-zeroing algorithm that greatly reduces (cancels out) the 1/f noise and cancels the offset value of the reference buffer. As a result, the SNR of the system is not affected by this 1/f noise component of the reference buffer, even at maximum oversampling ratio values. Write ‘1’ to enable it, write ‘0’ to disable it.

/sys/bus/iio/devices/iio:deviceX/battery_low

Defined on file sysfs-bus-iio-meas-spec

Reading returns either ‘1’ or ‘0’. ‘1’ means that the battery level supplied to sensor is below 2.25V. This ABI is available for tsys02d, htu21, ms8607

/sys/bus/iio/devices/iio:deviceX/boost_current_gain

Defined on file sysfs-bus-iio-adc-mcp3564

This attribute is used to set the gain of the biasing current circuit of the Delta-Sigma modulator. The different BOOST settings are applied to the entire modulator circuit, including the voltage reference buffers.

/sys/bus/iio/devices/iio:deviceX/boost_current_gain_available

Defined on file sysfs-bus-iio-adc-mcp3564

Reading returns a list with the possible gain values for the current biasing circuit of the Delta-Sigma modulator.

/sys/bus/iio/devices/iio:deviceX/bridge_switch_en

Defined on file sysfs-bus-iio-adc-ad7192

This attribute, if available, is used to close or open the bridge power down switch found on some converters. In bridge applications, such as strain gauges and load cells, the bridge itself consumes the majority of the current in the system. To minimize the current consumption of the system, the bridge can be disconnected (when it is not being used using the bridge_switch_en attribute.

/sys/bus/iio/devices/iio:deviceX/buffer

Defined on file sysfs-bus-iio

Directory of attributes relating to the buffer for the device.

/sys/bus/iio/devices/iio:deviceX/buffer/hwfifo_enabled

Defined on file sysfs-bus-iio

A read-only boolean value that indicates if the hardware fifo is currently enabled or disabled. If the device does not have a hardware fifo this entry is not present. The hardware fifo is enabled when the buffer is enabled if the current hardware fifo watermark level is set and other current device settings allows it (e.g. if a trigger is set that samples data differently that the hardware fifo does then hardware fifo will not enabled).

If the hardware fifo is enabled and the level of the hardware fifo reaches the hardware fifo watermark level the device will flush its hardware fifo to the device buffer. Doing a non blocking read on the device when no samples are present in the device buffer will also force a flush.

When the hardware fifo is enabled there is no need to use a trigger to use buffer mode since the watermark settings guarantees that the hardware fifo is flushed to the device buffer.

/sys/bus/iio/devices/iio:deviceX/buffer/hwfifo_watermark

Defined on file sysfs-bus-iio

Read-only entry that contains a single integer specifying the current watermark level for the hardware fifo. If the device does not have a hardware fifo this entry is not present. The watermark level for the hardware fifo is set by the driver based on the value set by the user in buffer/watermark but taking into account hardware limitations (e.g. most hardware buffers are limited to 32-64 samples, some hardware buffers watermarks are fixed or have minimum levels). A value of 0 means that the hardware watermark is unset.

/sys/bus/iio/devices/iio:deviceX/buffer/hwfifo_watermark_available

Defined on file sysfs-bus-iio

A list of positive integers specifying the available watermark levels for the hardware fifo. This entry is optional and if it is not present it means that all the values between hwfifo_watermark_min and hwfifo_watermark_max are supported.

If the user sets buffer/watermark to a value greater than hwfifo_watermak_min but not equal to any of the values in this list, the driver will chose an appropriate value for the hardware fifo watermark level.

/sys/bus/iio/devices/iio:deviceX/buffer/hwfifo_watermark_max

Defined on file sysfs-bus-iio

A single positive integer specifying the maximum watermark level for the hardware fifo of this device. If the device does not have a hardware fifo this entry is not present.

If the user sets buffer/watermark to a value greater than this one, then the hardware watermark will be capped at this value.

/sys/bus/iio/devices/iio:deviceX/buffer/hwfifo_watermark_min

Defined on file sysfs-bus-iio

A single positive integer specifying the minimum watermark level for the hardware fifo of this device. If the device does not have a hardware fifo this entry is not present.

If the user sets buffer/watermark to a value less than this one, then the hardware watermark will remain unset.

/sys/bus/iio/devices/iio:deviceX/buffer/length_align_bytes

Defined on file sysfs-bus-iio-dma-buffer

DMA buffers tend to have a alignment requirement for the buffers. If this alignment requirement is not met samples might be dropped from the buffer.

This property reports the alignment requirements in bytes. This means that the buffer size in bytes needs to be a integer multiple of the number reported by this file.

The alignment requirements in number of sample sets will depend on the enabled channels and the bytes per channel. This means that the alignment requirement in samples sets might change depending on which and how many channels are enabled. Whereas the alignment requirement reported in bytes by this property will remain static and does not depend on which channels are enabled.

/sys/bus/iio/devices/iio:deviceX/bufferY

Defined on file sysfs-bus-iio

Directory containing interfaces for elements that will be captured for a single triggered sample set in the buffer.

Since kernel 5.11 the scan_elements attributes are merged into the bufferY directory, to be configurable per buffer.

/sys/bus/iio/devices/iio:deviceX/bufferY/data_available

Defined on file sysfs-bus-iio

A read-only value indicating the bytes of data available in the buffer. In the case of an output buffer, this indicates the amount of empty space available to write data to. In the case of an input buffer, this indicates the amount of data available for reading.

/sys/bus/iio/devices/iio:deviceX/bufferY/enable

Defined on file sysfs-bus-iio

Actually start the buffer capture up. Will start trigger if first device and appropriate.

Note that it might be impossible to configure other attributes, (e.g.: events, scale, sampling rate) if they impact the currently active buffer capture session.

/sys/bus/iio/devices/iio:deviceX/bufferY/length

Defined on file sysfs-bus-iio

Number of scans contained by the buffer.

/sys/bus/iio/devices/iio:deviceX/bufferY/watermark

Defined on file sysfs-bus-iio

A single positive integer specifying the maximum number of scan elements to wait for.

Poll will block until the watermark is reached.

Blocking read will wait until the minimum between the requested read amount or the low water mark is available.

Non-blocking read will retrieve the available samples from the buffer even if there are less samples then watermark level. This allows the application to block on poll with a timeout and read the available samples after the timeout expires and thus have a maximum delay guarantee.

/sys/bus/iio/devices/iio:deviceX/calibrate

Defined on file sysfs-bus-iio-cros-ec

Writing ‘1’ will perform a FOC (Fast Online Calibration). The corresponding calibration offsets can be read from *_calibbias entries.

/sys/bus/iio/devices/iio:deviceX/calibration_auto_enable

Defined on file sysfs-bus-iio

Some sensors have the ability to apply auto calibration at runtime. For example, it may be necessary to compensate for contaminant build-up in a measurement chamber or optical element deterioration that would otherwise lead to sensor drift.

Writing 1 or 0 to this attribute will respectively activate or deactivate this auto calibration function.

Upon reading, the current status is returned.

/sys/bus/iio/devices/iio:deviceX/calibration_data

Defined on file sysfs-bus-iio-bno055

Reports the binary calibration data blob for the IMU sensors.

/sys/bus/iio/devices/iio:deviceX/calibration_forced_value

Defined on file sysfs-bus-iio

Some sensors have the ability to apply a manual calibration using a known measurement value, perhaps obtained from an external reference device.

Writing a value to this function will force such a calibration change. For the scd30 the value should be from the range [400 1 2000].

Note for the scd30 that a valid value may only be obtained once it is has been written. Until then any read back of this value should be ignored. As for the scd4x an error will be returned immediately if the manual calibration has failed.

/sys/bus/iio/devices/iio:deviceX/calibration_forced_value_available

Defined on file sysfs-bus-iio

Available range for the forced calibration value, expressed as:

  • a range specified as “[min step max]”

/sys/bus/iio/devices/iio:deviceX/cleaning_period

Defined on file sysfs-bus-iio-sps30

Sensor is capable of triggering self cleaning periodically. Period can be changed by writing a new value here. Upon reading the current one is returned. Units are seconds.

Writing 0 disables periodical self cleaning entirely.

/sys/bus/iio/devices/iio:deviceX/cleaning_period_available

Defined on file sysfs-bus-iio-sps30

The range of available values in seconds represented as the minimum value, the step and the maximum value, all enclosed in square brackets.

/sys/bus/iio/devices/iio:deviceX/current_timestamp_clock

Defined on file sysfs-bus-iio

String identifying current posix clock used to timestamp buffered samples and events for device X.

/sys/bus/iio/devices/iio:deviceX/error_status

Defined on file sysfs-bus-iio-chemical-sunrise-co2

Reading returns the current chip error status.

/sys/bus/iio/devices/iio:deviceX/error_status_available

Defined on file sysfs-bus-iio-chemical-sunrise-co2

Reading returns the list of possible chip error status. Available options are: - ‘error_fatal’: Analog front-end initialization error - ‘error_i2c’: Read/write to non-existing register - ‘error_algorithm’: Corrupted parameters - ‘error_calibration’: Calibration has failed - ‘error_self_diagnostic’: Internal interface failure - ‘error_out_of_range’: Measured concentration out of scale - ‘error_memory’: Error during memory operations - ‘error_no_measurement’: Cleared at first measurement - ‘error_low_voltage’: Sensor regulated voltage too low - ‘error_measurement_timeout’: Unable to complete measurement

/sys/bus/iio/devices/iio:deviceX/events

Defined on file sysfs-bus-iio

Configuration of which hardware generated events are passed up to user-space.

/sys/bus/iio/devices/iio:deviceX/events/in_altvoltage0_mag_rising_reset_max

Defined on file sysfs-bus-iio-resolver-ad2s1210

Reading returns the current Degradation of Signal Reset Maximum Threshold value in millivolts. Writing sets the value.

/sys/bus/iio/devices/iio:deviceX/events/in_altvoltage0_mag_rising_reset_max_available

Defined on file sysfs-bus-iio-resolver-ad2s1210

Reading returns the allowable voltage range for in_altvoltage0_mag_rising_reset_max.

/sys/bus/iio/devices/iio:deviceX/events/in_altvoltage0_mag_rising_reset_min

Defined on file sysfs-bus-iio-resolver-ad2s1210

Reading returns the current Degradation of Signal Reset Minimum Threshold value in millivolts. Writing sets the value.

/sys/bus/iio/devices/iio:deviceX/events/in_altvoltage0_mag_rising_reset_min_available

Defined on file sysfs-bus-iio-resolver-ad2s1210

Reading returns the allowable voltage range for in_altvoltage0_mag_rising_reset_min.

/sys/bus/iio/devices/iio:deviceX/events/in_altvoltageY_mag_either_label

/sys/bus/iio/devices/iio:deviceX/events/in_altvoltageY_mag_rising_label

/sys/bus/iio/devices/iio:deviceX/events/in_altvoltageY_thresh_falling_label

/sys/bus/iio/devices/iio:deviceX/events/in_altvoltageY_thresh_rising_label

/sys/bus/iio/devices/iio:deviceX/events/in_anglvelY_mag_rising_label

/sys/bus/iio/devices/iio:deviceX/events/in_anglY_thresh_rising_label

/sys/bus/iio/devices/iio:deviceX/events/in_phaseY_mag_rising_label

Defined on file sysfs-bus-iio

Optional symbolic label to a device channel event. If a label is defined for this event add that to the event specific attributes. This is useful for userspace to be able to better identify an individual event.

/sys/bus/iio/devices/iio:deviceX/events/in_illuminance_period_available

Defined on file sysfs-bus-iio

List of valid periods (in seconds) for which the light intensity must be above the threshold level before interrupt is asserted.

/sys/bus/iio/devices/iio:deviceX/events/in_voltageY_thresh_falling_value

Defined on file sysfs-bus-iio-adc-hi8435

Channel Y low voltage threshold. If sensor input voltage goes lower then this value then the threshold falling event is pushed. Depending on in_voltageY_sensing_mode the low voltage threshold is separately set for “GND-Open” and “Supply-Open” modes. Channels 0..31 have common low threshold values, but could have different sensing_modes.

The low voltage threshold range is between 2..21V. Hysteresis between low and high thresholds can not be lower then 2 and can not be odd.

If falling threshold results hysteresis to odd value then rising threshold is automatically subtracted by one.

/sys/bus/iio/devices/iio:deviceX/events/in_voltageY_thresh_rising_value

Defined on file sysfs-bus-iio-adc-hi8435

Channel Y high voltage threshold. If sensor input voltage goes higher then this value then the threshold rising event is pushed. Depending on in_voltageY_sensing_mode the high voltage threshold is separately set for “GND-Open” and “Supply-Open” modes.

Channels 0..31 have common high threshold values, but could have different sensing_modes.

The high voltage threshold range is between 3..22V. Hysteresis between low and high thresholds can not be lower then 2 and can not be odd.

If rising threshold results hysteresis to odd value then falling threshold is automatically appended by one.

/sys/bus/iio/devices/iio:deviceX/fault_oc

Defined on file sysfs-bus-iio-thermocouple

Open-circuit fault. The detection of open-circuit faults, such as those caused by broken thermocouple wires. Reading returns ‘1’ if fault, ‘0’ otherwise.

/sys/bus/iio/devices/iio:deviceX/fault_ovuv

Defined on file sysfs-bus-iio-thermocouple

Overvoltage or Undervoltage Input Fault. The internal circuitry is protected from excessive voltages applied to the thermocouple cables. The device can also detect if such a condition occurs.

Reading returns ‘1’ if input voltage is negative or greater than VDD, otherwise ‘0’.

/sys/bus/iio/devices/iio:deviceX/filter_mode

Defined on file sysfs-bus-iio-filter-admv8818

This attribute configures the filter mode. Reading returns the actual mode.

/sys/bus/iio/devices/iio:deviceX/filter_mode_available

Defined on file sysfs-bus-iio-filter-admv8818

Reading this returns the valid values that can be written to the on_altvoltage0_mode attribute:

  • auto -> Adjust bandpass filter to track changes in input clock rate.

  • manual -> disable/unregister the clock rate notifier / input clock tracking.

  • bypass -> bypass low pass filter, high pass filter and disable/unregister

    the clock rate notifier

/sys/bus/iio/devices/iio:deviceX/fusion_enable

Defined on file sysfs-bus-iio-bno055

Can be 1 or 0. Enables/disables the “sensor fusion” (a.k.a. NDOF) HW function.

/sys/bus/iio/devices/iio:deviceX/heater_enable

Defined on file sysfs-bus-iio

‘1’ (enable) or ‘0’ (disable) specifying the enable of heater function. Same reading values apply.

This ABI is especially applicable for humidity sensors to heatup the device and get rid of any condensation in some humidity environment

/sys/bus/iio/devices/iio:deviceX/id

Defined on file sysfs-bus-iio-cros-ec

This attribute is exposed by the CrOS EC sensors driver and represents the sensor ID as exposed by the EC. This ID is used by the Android sensor service hardware abstraction layer (sensor HAL) through the Android container on ChromeOS.

/sys/bus/iio/devices/iio:deviceX/in_X_mean_raw

Defined on file sysfs-bus-iio

Averaged raw measurement from channel X. The number of values used for averaging is device specific. The converting rules for normal raw values also applies to the averaged raw values.

/sys/bus/iio/devices/iio:deviceX/in_accel_calibbias_available

/sys/bus/iio/devices/iio:deviceX/in_anglvel_calibbias_available

Defined on file sysfs-bus-iio

Available values of calibbias. Maybe expressed as either of:

  • a small discrete set of values like “0 2 4 6 8”

  • a range specified as “[min step max]”

/sys/bus/iio/devices/iio:deviceX/in_accel_calibration_auto_status

Defined on file sysfs-bus-iio-bno055

Reports the autocalibration status for the accelerometer sensor. Can be 0 (calibration non even enabled) or 1 to 5 where the greater the number, the better the calibration status.

/sys/bus/iio/devices/iio:deviceX/in_accel_linear_x_raw

/sys/bus/iio/devices/iio:deviceX/in_accel_linear_y_raw

/sys/bus/iio/devices/iio:deviceX/in_accel_linear_z_raw

Defined on file sysfs-bus-iio

As per in_accel_X_raw attributes, but minus the acceleration due to gravity.

/sys/bus/iio/devices/iio:deviceX/in_accel_offset

/sys/bus/iio/devices/iio:deviceX/in_accel_x_offset

/sys/bus/iio/devices/iio:deviceX/in_accel_y_offset

/sys/bus/iio/devices/iio:deviceX/in_accel_z_offset

/sys/bus/iio/devices/iio:deviceX/in_voltageY_offset

/sys/bus/iio/devices/iio:deviceX/in_voltage_offset

/sys/bus/iio/devices/iio:deviceX/in_voltageY_i_offset

/sys/bus/iio/devices/iio:deviceX/in_voltageY_q_offset

/sys/bus/iio/devices/iio:deviceX/in_voltage_q_offset

/sys/bus/iio/devices/iio:deviceX/in_voltage_i_offset

/sys/bus/iio/devices/iio:deviceX/in_currentY_offset

/sys/bus/iio/devices/iio:deviceX/in_current_offset

/sys/bus/iio/devices/iio:deviceX/in_currentY_i_offset

/sys/bus/iio/devices/iio:deviceX/in_currentY_q_offset

/sys/bus/iio/devices/iio:deviceX/in_current_q_offset

/sys/bus/iio/devices/iio:deviceX/in_current_i_offset

/sys/bus/iio/devices/iio:deviceX/in_tempY_offset

/sys/bus/iio/devices/iio:deviceX/in_temp_offset

/sys/bus/iio/devices/iio:deviceX/in_pressureY_offset

/sys/bus/iio/devices/iio:deviceX/in_pressure_offset

/sys/bus/iio/devices/iio:deviceX/in_humidityrelative_offset

/sys/bus/iio/devices/iio:deviceX/in_magn_offset

/sys/bus/iio/devices/iio:deviceX/in_rot_offset

/sys/bus/iio/devices/iio:deviceX/in_angl_offset

/sys/bus/iio/devices/iio:deviceX/in_capacitanceX_offset

Defined on file sysfs-bus-iio

If known for a device, offset to be added to <type>[Y]_raw prior to scaling by <type>[Y]_scale in order to obtain value in the <type> units as specified in <type>[Y]_raw documentation. Not present if the offset is always 0 or unknown. If Y or axis <x|y|z> is not present, then the offset applies to all in channels of <type>. May be writable if a variable offset can be applied on the device. Note that this is different to calibbias which is for devices (or drivers) that apply offsets to compensate for variation between different instances of the part, typically adjusted by using some hardware supported calibration procedure. Calibbias is applied internally, offset is applied in userspace to the _raw output.

/sys/bus/iio/devices/iio:deviceX/in_accel_power_mode

Defined on file sysfs-bus-iio-inv_icm42600

Accelerometer power mode. Setting this attribute will set the requested power mode to use if the ODR support it. If ODR support only 1 mode, power mode will be enforced. Reading this attribute will return the current accelerometer power mode if the sensor is on, or the requested value if the sensor is off. The value between real and requested value can be different for ODR supporting only 1 mode.

/sys/bus/iio/devices/iio:deviceX/in_accel_power_mode_available

Defined on file sysfs-bus-iio-inv_icm42600

List of available accelerometer power modes that can be set in in_accel_power_mode attribute.

/sys/bus/iio/devices/iio:deviceX/in_accel_raw_range

Defined on file sysfs-bus-iio-bno055

Raw (unscaled) range for acceleration readings. Unit after application of scale is m/s^2. Note that this doesn’t affects the scale (which should be used when changing the maximum and minimum readable value affects also the reading scaling factor).

/sys/bus/iio/devices/iio:deviceX/in_accel_raw_range_available

Defined on file sysfs-bus-iio-bno055

List of allowed values for in_accel_raw_range attribute

/sys/bus/iio/devices/iio:deviceX/in_accel_scale_available

/sys/.../iio:deviceX/in_anglvel_scale_available

/sys/.../iio:deviceX/in_magn_scale_available

/sys/.../iio:deviceX/in_illuminance_scale_available

/sys/.../iio:deviceX/in_intensity_scale_available

/sys/.../iio:deviceX/in_proximity_scale_available

/sys/.../iio:deviceX/in_voltageX_scale_available

/sys/.../iio:deviceX/in_voltage-voltage_scale_available

/sys/.../iio:deviceX/out_voltageX_scale_available

/sys/.../iio:deviceX/out_altvoltageX_scale_available

/sys/.../iio:deviceX/in_capacitance_scale_available

/sys/.../iio:deviceX/in_pressure_scale_available

/sys/.../iio:deviceX/in_pressureY_scale_available

Defined on file sysfs-bus-iio

If a discrete set of scale values is available, they are listed in this attribute. Unlike illumination, multiplying intensity by intensity_scale does not yield value with any standardized unit.

/sys/bus/iio/devices/iio:deviceX/in_accel_x_calibbias

/sys/bus/iio/devices/iio:deviceX/in_accel_y_calibbias

/sys/bus/iio/devices/iio:deviceX/in_accel_z_calibbias

/sys/bus/iio/devices/iio:deviceX/in_anglvel_x_calibbias

/sys/bus/iio/devices/iio:deviceX/in_anglvel_y_calibbias

/sys/bus/iio/devices/iio:deviceX/in_anglvel_z_calibbias

/sys/bus/iio/devices/iio:deviceX/in_illuminance0_calibbias

/sys/bus/iio/devices/iio:deviceX/in_proximity0_calibbias

/sys/bus/iio/devices/iio:deviceX/in_pressureY_calibbias

/sys/bus/iio/devices/iio:deviceX/in_pressure_calibbias

Defined on file sysfs-bus-iio

Hardware applied calibration offset (assumed to fix production inaccuracies). icm42600: For this device values are real physical offsets expressed in SI units (m/s^2 for accelerometers and rad/s for gyroscope)/

/sys/bus/iio/devices/iio:deviceX/in_accel_x_peak_raw

/sys/bus/iio/devices/iio:deviceX/in_accel_y_peak_raw

/sys/bus/iio/devices/iio:deviceX/in_accel_z_peak_raw

/sys/bus/iio/devices/iio:deviceX/in_humidityrelative_peak_raw

/sys/bus/iio/devices/iio:deviceX/in_temp_peak_raw

Defined on file sysfs-bus-iio

Highest value since some reset condition. These attributes allow access to this and are otherwise the direct equivalent of the <type>Y[_name]_raw attributes.

/sys/bus/iio/devices/iio:deviceX/in_accel_x_raw

/sys/bus/iio/devices/iio:deviceX/in_accel_y_raw

/sys/bus/iio/devices/iio:deviceX/in_accel_z_raw

Defined on file sysfs-bus-iio

Acceleration in direction x, y or z (may be arbitrarily assigned but should match other such assignments on device). Has all of the equivalent parameters as per voltageY. Units after application of scale and offset are m/s^2.

/sys/bus/iio/devices/iio:deviceX/in_accel_xyz_squared_peak_raw

Defined on file sysfs-bus-iio

A computed peak value based on the sum squared magnitude of the underlying value in the specified directions.

/sys/bus/iio/devices/iio:deviceX/in_activity_calibgender_available

/sys/bus/iio/devices/iio:deviceX/in_energy_calibgender_available

/sys/bus/iio/devices/iio:deviceX/in_distance_calibgender_available

/sys/bus/iio/devices/iio:deviceX/in_velocity_calibgender_available

Defined on file sysfs-bus-iio

Lists all available gender values (e.g.: male, female).

/sys/bus/iio/devices/iio:deviceX/in_activity_calibgender

/sys/bus/iio/devices/iio:deviceX/in_energy_calibgender

/sys/bus/iio/devices/iio:deviceX/in_distance_calibgender

/sys/bus/iio/devices/iio:deviceX/in_velocity_calibgender

Defined on file sysfs-bus-iio

Gender of the user (e.g.: male, female) used by some pedometers to compute the stride length, distance, speed and activity type.

/sys/bus/iio/devices/iio:deviceX/in_activity_calibheight

/sys/bus/iio/devices/iio:deviceX/in_energy_calibheight

/sys/bus/iio/devices/iio:deviceX/in_distance_calibheight

/sys/bus/iio/devices/iio:deviceX/in_velocity_calibheight

Defined on file sysfs-bus-iio

Height of the user (in meters) used by some pedometers to compute the stride length, distance, speed and activity type.

/sys/bus/iio/devices/iio:deviceX/in_allow_async_readout

Defined on file sysfs-bus-iio-ina2xx-adc

By default (value ‘0’), the capture thread checks for the Conversion Ready Flag to being set prior to committing a new value to the sample buffer. This synchronizes the in-chip conversion rate with the in-driver readout rate at the cost of an additional register read.

Writing ‘1’ will remove the polling for the Conversion Ready Flags to save the additional i2c transaction, which will improve the bandwidth available for reading data. However, samples can be occasionally skipped or repeated, depending on the beat between the capture and conversion rates.

/sys/bus/iio/devices/iio:deviceX/in_altvoltage0-1_i_calibphase

Defined on file sysfs-bus-iio-frequency-admv1013

Read/write unscaled value for the Local Oscillatior path quadrature I phase shift.

/sys/bus/iio/devices/iio:deviceX/in_altvoltage0-1_q_calibphase

Defined on file sysfs-bus-iio-frequency-admv1013

Read/write unscaled value for the Local Oscillatior path quadrature Q phase shift.

/sys/bus/iio/devices/iio:deviceX/in_altvoltage0_i_calibbias

Defined on file sysfs-bus-iio-frequency-admv1013

Read/write value for the Local Oscillatior Feedthrough Offset Calibration I Positive side.

/sys/bus/iio/devices/iio:deviceX/in_altvoltage0_i_calibscale_coarse

Defined on file sysfs-bus-iio-frequency-admv1014

Read/write value for the digital attenuator gain (IF_I) with coarse steps.

/sys/bus/iio/devices/iio:deviceX/in_altvoltage0_i_calibscale_fine

Defined on file sysfs-bus-iio-frequency-admv1014

Read/write value for the digital attenuator gain (IF_I) with fine steps.

/sys/bus/iio/devices/iio:deviceX/in_altvoltage0_q_calibbias

Defined on file sysfs-bus-iio-frequency-admv1013

Read/write value for the Local Oscillatior Feedthrough Offset Calibration Q Positive side.

/sys/bus/iio/devices/iio:deviceX/in_altvoltage0_q_calibscale_coarse

Defined on file sysfs-bus-iio-frequency-admv1014

Read/write value for the digital attenuator gain (IF_Q) with coarse steps.

/sys/bus/iio/devices/iio:deviceX/in_altvoltage0_q_calibscale_fine

Defined on file sysfs-bus-iio-frequency-admv1014

Read/write value for the digital attenuator gain (IF_Q) with fine steps.

/sys/bus/iio/devices/iio:deviceX/in_altvoltage1_i_calibbias

Defined on file sysfs-bus-iio-frequency-admv1013

Read/write raw value for the Local Oscillatior Feedthrough Offset Calibration I Negative side.

/sys/bus/iio/devices/iio:deviceX/in_altvoltage1_q_calibbias

Defined on file sysfs-bus-iio-frequency-admv1013

Read/write raw value for the Local Oscillatior Feedthrough Offset Calibration Q Negative side.

/sys/bus/iio/devices/iio:deviceX/in_altvoltageY_compare_interval

Defined on file sysfs-bus-iio-adc-envelope-detector

Number of milliseconds to wait for the comparator in each step of the binary search for the input peak level. Needs to relate to the frequency of the input signal.

/sys/bus/iio/devices/iio:deviceX/in_altvoltageY_invert

Defined on file sysfs-bus-iio-adc-envelope-detector

The DAC is used to find the peak level of an alternating voltage input signal by a binary search using the output of a comparator wired to an interrupt pin. Like so:

                      _
                     | \
input +------>-------|+ \
                     |   \
       .-------.     |    }---.
       |       |     |   /    |
       |    dac|-->--|- /     |
       |       |     |_/      |
       |       |              |
       |       |              |
       |    irq|------<-------'
       |       |
       '-------'

The boolean invert attribute (0/1) should be set when the input signal is centered around the maximum value of the dac instead of zero. The envelope detector will search from below in this case and will also invert the result.

The edge/level of the interrupt is also switched to its opposite value.

/sys/bus/iio/devices/iio:deviceX/in_anglY_label

Defined on file sysfs-bus-iio

Optional symbolic label for channel Y. For Intel hid hinge sensor, the label values are: hinge, keyboard, screen. It means the three channels each correspond respectively to hinge angle, keyboard angle, and screen angle.

/sys/bus/iio/devices/iio:deviceX/in_angl_raw

/sys/bus/iio/devices/iio:deviceX/in_anglY_raw

Defined on file sysfs-bus-iio

Angle of rotation. Units after application of scale and offset are radians.

/sys/bus/iio/devices/iio:deviceX/in_anglvel_raw_range

Defined on file sysfs-bus-iio-bno055

Range for angular velocity readings in radians per second. Note that this does not affects the scale (which should be used when changing the maximum and minimum readable value affects also the reading scaling factor).

/sys/bus/iio/devices/iio:deviceX/in_anglvel_raw_range_available

Defined on file sysfs-bus-iio-bno055

List of allowed values for in_anglvel_raw_range attribute

/sys/bus/iio/devices/iio:deviceX/in_anglvel_x_raw

/sys/bus/iio/devices/iio:deviceX/in_anglvel_y_raw

/sys/bus/iio/devices/iio:deviceX/in_anglvel_z_raw

Defined on file sysfs-bus-iio

Angular velocity about axis x, y or z (may be arbitrarily assigned). Has all the equivalent parameters as per voltageY. Units after application of scale and offset are radians per second.

/sys/bus/iio/devices/iio:deviceX/in_capacitanceY_raw

Defined on file sysfs-bus-iio

Raw capacitance measurement from channel Y. Units after application of scale and offset are nanofarads.

/sys/bus/iio/devices/iio:deviceX/in_chromaticity_x_raw

/sys/bus/iio/devices/iio:deviceX/in_chromaticity_y_raw

Defined on file sysfs-bus-iio

The x and y light color coordinate on the CIE 1931 chromaticity diagram.

/sys/bus/iio/devices/iio:deviceX/in_colortemp_raw

Defined on file sysfs-bus-iio

Represents light color temperature, which measures light color temperature in Kelvin.

/sys/bus/iio/devices/iio:deviceX/in_concentration_VOC_short_raw

Defined on file sysfs-bus-iio-chemical-vz89x

Get the raw calibration VOC value from the sensor. This value has little application outside of calibration.

/sys/bus/iio/devices/iio:deviceX/in_concentration_co2_calibration_background

Defined on file sysfs-bus-iio-chemical-sunrise-co2

Writing ‘1’ triggers a ‘Background’ calibration cycle.

/sys/bus/iio/devices/iio:deviceX/in_concentration_co2_calibration_factory

Defined on file sysfs-bus-iio-chemical-sunrise-co2

Writing ‘1’ triggers a ‘Factory’ calibration cycle.

/sys/bus/iio/devices/iio:deviceX/in_concentration_raw

/sys/bus/iio/devices/iio:deviceX/in_concentrationX_raw

/sys/bus/iio/devices/iio:deviceX/in_concentration_co2_raw

/sys/bus/iio/devices/iio:deviceX/in_concentrationX_co2_raw

/sys/bus/iio/devices/iio:deviceX/in_concentration_ethanol_raw

/sys/bus/iio/devices/iio:deviceX/in_concentrationX_ethanol_raw

/sys/bus/iio/devices/iio:deviceX/in_concentration_h2_raw

/sys/bus/iio/devices/iio:deviceX/in_concentrationX_h2_raw

/sys/bus/iio/devices/iio:deviceX/in_concentration_o2_raw

/sys/bus/iio/devices/iio:deviceX/in_concentrationX_o2_raw

/sys/bus/iio/devices/iio:deviceX/in_concentration_voc_raw

/sys/bus/iio/devices/iio:deviceX/in_concentrationX_voc_raw

Defined on file sysfs-bus-iio

Raw (unscaled no offset etc.) reading of a substance. Units after application of scale and offset are percents.

/sys/bus/iio/devices/iio:deviceX/in_conversion_mode

Defined on file sysfs-bus-iio-vf610

Specifies the hardware conversion mode used. The three available modes are “normal”, “high-speed” and “low-power”, where the last is the default mode.

/sys/bus/iio/devices/iio:deviceX/in_count0_enable_mode

Defined on file sysfs-bus-iio-timer-stm32

Configure the device counter enable modes, in all case counting direction is set by in_count0_count_direction attribute and the counter is clocked by the internal clock.

always:

Counter is always ON.

gated:

Counting is enabled when connected trigger signal level is high else counting is disabled.

triggered:

Counting is enabled on rising edge of the connected trigger, and remains enabled for the duration of this selected mode.

/sys/bus/iio/devices/iio:deviceX/in_count0_preset

Defined on file sysfs-bus-iio-timer-stm32

Reading returns the current preset value. Writing sets the preset value. When counting up the counter starts from 0 and fires an event when reach preset value. When counting down the counter start from preset value and fire event when reach 0.

/sys/bus/iio/devices/iio:deviceX/in_count0_trigger_mode

Defined on file sysfs-bus-iio-timer-stm32

Configure the device counter trigger mode counting direction is set by in_count0_count_direction attribute and the counter is clocked by the connected trigger rising edges.

/sys/bus/iio/devices/iio:deviceX/in_countY_count_direction

Defined on file sysfs-bus-iio

This interface is deprecated; please use the Counter subsystem.

Raw counter device counters direction for channel Y.

/sys/bus/iio/devices/iio:deviceX/in_countY_raw

Defined on file sysfs-bus-iio

This interface is deprecated; please use the Counter subsystem.

Raw counter device counts from channel Y. For quadrature counters, multiplication by an available [Y]_scale results in the counts of a single quadrature signal phase from channel Y.

/sys/bus/iio/devices/iio:deviceX/in_count_count_direction_available

Defined on file sysfs-bus-iio

This interface is deprecated; please use the Counter subsystem.

A list of possible counting directions which are:

  • “up” : counter device is increasing.

  • “down”: counter device is decreasing.

/sys/bus/iio/devices/iio:deviceX/in_count_enable_mode_available

Defined on file sysfs-bus-iio-timer-stm32

Reading returns the list possible enable modes.

/sys/bus/iio/devices/iio:deviceX/in_count_trigger_mode_available

Defined on file sysfs-bus-iio-timer-stm32

Reading returns the list possible trigger modes.

/sys/bus/iio/devices/iio:deviceX/in_current5_raw

Defined on file sysfs-bus-iio-adc-mt6360

Indicated MT6360 IBUS ADC Calculating with scale and offset returns voltage in uA

/sys/bus/iio/devices/iio:deviceX/in_current6_raw

Defined on file sysfs-bus-iio-adc-mt6360

Indicated MT6360 IBAT ADC Calculating with scale and offset returns voltage in uA

/sys/bus/iio/devices/iio:deviceX/in_current7_raw

Defined on file sysfs-bus-iio-adc-mt6360

Indicated MT6360 CHG_VDDP ADC Calculating with scale and offset returns voltage in uV

/sys/bus/iio/devices/iio:deviceX/in_currentX_raw

/sys/bus/iio/devices/iio:deviceX/in_currentX_i_raw

/sys/bus/iio/devices/iio:deviceX/in_currentX_q_raw

Defined on file sysfs-bus-iio

Raw current measurement from channel X. Units are in milliamps after application of scale and offset. If no offset or scale is present, output should be considered as processed with the unit in milliamps.

Channels with ‘i’ and ‘q’ modifiers always exist in pairs and both channels refer to the same signal. The ‘i’ channel contains the in-phase component of the signal while the ‘q’ channel contains the quadrature component.

/sys/bus/iio/devices/iio:deviceX/in_currentY_raw

/sys/bus/iio/devices/iio:deviceX/in_currentY_supply_raw

Defined on file sysfs-bus-iio

Raw (unscaled no bias removal etc.) current measurement from channel Y. In special cases where the channel does not correspond to externally available input one of the named versions may be used. The number must always be specified and unique to allow association with event codes. Units after application of scale and offset are milliamps.

/sys/bus/iio/devices/iio:deviceX/in_current_shunt_resistor

Defined on file sysfs-bus-iio-adc-max9611

The value of the shunt resistor used to compute current flowing between RS+ and RS- voltage sense inputs. In Ohms.

These attributes describe a single physical component, exposed as two distinct attributes as it is used to calculate two different values: power load and current flowing between RS+ and RS- inputs.

/sys/bus/iio/devices/iio:deviceX/in_deltaangl_x_raw

/sys/bus/iio/devices/iio:deviceX/in_deltaangl_y_raw

/sys/bus/iio/devices/iio:deviceX/in_deltaangl_z_raw

Defined on file sysfs-bus-iio

Angular displacement between two consecutive samples on x, y or z (may be arbitrarily assigned but should match other such assignments on device). In order to compute the total angular displacement during a desired period of time, the application should sum-up the delta angle samples acquired during that time. Units after application of scale and offset are radians.

/sys/bus/iio/devices/iio:deviceX/in_deltavelocity_x_raw

/sys/bus/iio/devices/iio:deviceX/in_deltavelocity_y_raw

/sys/bus/iio/devices/iio:deviceX/in_deltavelocity_z_raw

Defined on file sysfs-bus-iio

The linear velocity change between two consecutive samples on x, y or z (may be arbitrarily assigned but should match other such assignments on device). In order to compute the total linear velocity change during a desired period of time, the application should sum-up the delta velocity samples acquired during that time. Units after application of scale and offset are meters per second.

/sys/bus/iio/devices/iio:deviceX/in_electricalconductivity_raw

Defined on file sysfs-bus-iio

Raw (unscaled no offset etc.) electric conductivity reading. Units after application of scale and offset are siemens per meter.

/sys/bus/iio/devices/iio:deviceX/in_energy_calibweight

Defined on file sysfs-bus-iio

Weight of the user (in kg). It is needed by some pedometers to compute the calories burnt by the user.

/sys/bus/iio/devices/iio:deviceX/in_filter_notch_center_frequency

Defined on file sysfs-bus-iio

Center frequency in Hz for a notch filter. Used i.e. for line noise suppression.

/sys/bus/iio/devices/iio:deviceX/in_gravity_x_raw

/sys/bus/iio/devices/iio:deviceX/in_gravity_y_raw

/sys/bus/iio/devices/iio:deviceX/in_gravity_z_raw

Defined on file sysfs-bus-iio

Gravity in direction x, y or z (may be arbitrarily assigned but should match other such assignments on device). Units after application of scale and offset are m/s^2.

/sys/bus/iio/devices/iio:deviceX/in_gyro_calibration_auto_status

Defined on file sysfs-bus-iio-bno055

Reports the autocalibration status for the gyroscope sensor. Can be 0 (calibration non even enabled) or 1 to 5 where the greater the number, the better the calibration status.

/sys/bus/iio/devices/iio:deviceX/in_gyro_matrix

/sys/bus/iio/devices/iio:deviceX/in_accel_matrix

/sys/bus/iio/devices/iio:deviceX/in_magn_matrix

Defined on file sysfs-bus-iio-mpu6050

This is mounting matrix for motion sensors. Mounting matrix is a 3x3 unitary matrix. A typical mounting matrix would look like [0, 1, 0; 1, 0, 0; 0, 0, -1]. Using this information, it would be easy to tell the relative positions among sensors as well as their positions relative to the board that holds these sensors. Identity matrix [1, 0, 0; 0, 1, 0; 0, 0, 1] means sensor chip and device are perfectly aligned with each other. All axes are exactly the same.

/sys/bus/iio/devices/iio:deviceX/in_humidityrelative_input

Defined on file sysfs-bus-iio

Scaled humidity measurement in milli percent.

/sys/bus/iio/devices/iio:deviceX/in_humidityrelative_raw

Defined on file sysfs-bus-iio

Raw humidity measurement of air. Units after application of scale and offset are milli percent.

/sys/bus/iio/devices/iio:deviceX/in_humidityrelative_trough_raw

/sys/bus/iio/devices/iio:deviceX/in_temp_trough_raw

Defined on file sysfs-bus-iio

Lowest value since some reset condition. These attributes allow access to this and are otherwise the direct equivalent of the <type>Y[_name]_raw attributes.

/sys/bus/iio/devices/iio:deviceX/in_illuminance0_zone

Defined on file sysfs-bus-iio-light-lm3533-als

Get the current light zone (0..4) as defined by the in_illuminance0_threshY_{falling,rising} thresholds.

/sys/bus/iio/devices/iio:deviceX/in_illuminance_hysteresis_relative

/sys/bus/iio/devices/iio:deviceX/in_intensity_hysteresis_relative

Defined on file sysfs-bus-iio

Specify the percent for light sensor relative to the channel absolute value that a data field should change before an event is generated. Units are a percentage of the prior reading.

/sys/bus/iio/devices/iio:deviceX/in_incli_x_raw

/sys/bus/iio/devices/iio:deviceX/in_incli_y_raw

/sys/bus/iio/devices/iio:deviceX/in_incli_z_raw

Defined on file sysfs-bus-iio

Inclination raw reading about axis x, y or z (may be arbitrarily assigned). Data converted by application of offset and scale to degrees.

/sys/bus/iio/devices/iio:deviceX/in_indexY_raw

Defined on file sysfs-bus-iio

This interface is deprecated; please use the Counter subsystem.

Raw counter device index value from channel Y. This attribute provides an absolute positional reference (e.g. a pulse once per revolution) which may be used to home positional systems as required.

/sys/bus/iio/devices/iio:deviceX/in_intensityY_offset

Defined on file sysfs-bus-iio-health-afe440x

Get and set the offset cancellation DAC setting for these stages. The values are expressed in 5-bit sign-magnitude.

/sys/bus/iio/devices/iio:deviceX/in_intensityY_raw

Defined on file sysfs-bus-iio-health-afe440x

Get measured values from the ADC for these stages. Y is the specific stage number corresponding to datasheet stage names as follows:

1

LED2

2

ALED2/LED3

3

LED1

4

ALED1/LED4

Note that channels 5 and 6 represent LED2-ALED2 and LED1-ALED1 respectively which simply helper channels containing the calculated difference in the value of stage 1 - 2 and 3 - 4. The values are expressed in 24-bit twos complement. The LED current for the stage is controlled via out_currentY_raw.

/sys/bus/iio/devices/iio:deviceX/in_intensityY_resistance

/sys/bus/iio/devices/iio:deviceX/in_intensityY_capacitance

Defined on file sysfs-bus-iio-health-afe440x

Get and set the resistance and the capacitance settings for the Transimpedance Amplifier during the associated stage.

/sys/bus/iio/devices/iio:deviceX/in_intensity_hardwaregain_available

Defined on file sysfs-bus-iio

Lists all available hardware applied gain factors. Shared across all channels.

/sys/bus/iio/devices/iio:deviceX/in_intensity_ir_large_raw

Defined on file sysfs-bus-iio-light-si1133

Unit-less infrared intensity. The intensity is measured from 4 dark photodiodes. “large” indicate the surface area capturing infrared.

/sys/bus/iio/devices/iio:deviceX/in_intensity_ir_small_raw

Defined on file sysfs-bus-iio-light-si1133

Unit-less infrared intensity. The intensity is measured from 1 dark photodiode. “small” indicate the surface area capturing infrared.

/sys/bus/iio/devices/iio:deviceX/in_intensity_large_raw

Defined on file sysfs-bus-iio-light-si1133

Unit-less light intensity with more diodes.

/sys/bus/iio/devices/iio:deviceX/in_intensity_x_raw

/sys/bus/iio/devices/iio:deviceX/in_intensity_y_raw

/sys/bus/iio/devices/iio:deviceX/in_intensity_z_raw

Defined on file sysfs-bus-iio

Unscaled light intensity according to CIE 1931/DIN 5033 color space. Units after application of scale are nano nanowatts per square meter.

/sys/bus/iio/devices/iio:deviceX/in_magn_calibration_auto_status

Defined on file sysfs-bus-iio-bno055

Reports the autocalibration status for the magnetometer sensor. Can be 0 (calibration non even enabled) or 1 to 5 where the greater the number, the better the calibration status.

/sys/bus/iio/devices/iio:deviceX/in_magn_calibration_fast_enable

Defined on file sysfs-bus-iio-bno055

Can be 1 or 0. Enables/disables the “Fast Magnetometer Calibration” HW function.

/sys/bus/iio/devices/iio:deviceX/in_magn_x_oversampling_ratio

/sys/bus/iio/devices/iio:deviceX/in_magn_y_oversampling_ratio

/sys/bus/iio/devices/iio:deviceX/in_magn_z_oversampling_ratio

Defined on file sysfs-bus-iio

Hardware applied number of measurements for acquiring one data point. The HW will do <type>[_name]_oversampling_ratio measurements and return the average value as output data. Each value resulted from <type>[_name]_oversampling_ratio measurements is considered as one sample for <type>[_name]_sampling_frequency.

/sys/bus/iio/devices/iio:deviceX/in_magn_x_raw

/sys/bus/iio/devices/iio:deviceX/in_magn_y_raw

/sys/bus/iio/devices/iio:deviceX/in_magn_z_raw

Defined on file sysfs-bus-iio

Magnetic field along axis x, y or z (may be arbitrarily assigned). Data converted by application of offset then scale to Gauss.

/sys/bus/iio/devices/iio:deviceX/in_massconcentration_pm1_input

/sys/bus/iio/devices/iio:deviceX/in_massconcentrationY_pm1_input

/sys/bus/iio/devices/iio:deviceX/in_massconcentration_pm2p5_input

/sys/bus/iio/devices/iio:deviceX/in_massconcentrationY_pm2p5_input

/sys/bus/iio/devices/iio:deviceX/in_massconcentration_pm4_input

/sys/bus/iio/devices/iio:deviceX/in_massconcentrationY_pm4_input

/sys/bus/iio/devices/iio:deviceX/in_massconcentration_pm10_input

/sys/bus/iio/devices/iio:deviceX/in_massconcentrationY_pm10_input

Defined on file sysfs-bus-iio

Mass concentration reading of particulate matter in ug / m3. pmX consists of particles with aerodynamic diameter less or equal to X micrometers.

/sys/bus/iio/devices/iio:deviceX/in_ph_raw

Defined on file sysfs-bus-iio

Raw (unscaled no offset etc.) pH reading of a substance as a negative base-10 logarithm of hydrodium ions in a litre of water.

/sys/bus/iio/devices/iio:deviceX/in_phaseY_raw

Defined on file sysfs-bus-iio

Raw (unscaled) phase difference reading from channel Y. Units after application of scale and offset are radians.

/sys/bus/iio/devices/iio:deviceX/in_positionrelative_x_raw

/sys/bus/iio/devices/iio:deviceX/in_positionrelative_y_raw

Defined on file sysfs-bus-iio

Relative position in direction x or y on a pad (may be arbitrarily assigned but should match other such assignments on device). Units after application of scale and offset are milli percents from the pad’s size in both directions. Should be calibrated by the consumer.

/sys/bus/iio/devices/iio:deviceX/in_powerY_raw

Defined on file sysfs-bus-iio

Raw (unscaled no bias removal etc.) power measurement from channel Y. The number must always be specified and unique to allow association with event codes. Units after application of scale and offset are milliwatts.

/sys/bus/iio/devices/iio:deviceX/in_power_shunt_resistor

Defined on file sysfs-bus-iio-adc-max9611

The value of the shunt resistor used to compute power drain on common input voltage pin (RS+). In Ohms.

/sys/bus/iio/devices/iio:deviceX/in_pressureY_input

/sys/bus/iio/devices/iio:deviceX/in_pressure_input

Defined on file sysfs-bus-iio

Scaled pressure measurement from channel Y, in kilopascal.

/sys/bus/iio/devices/iio:deviceX/in_pressureY_raw

/sys/bus/iio/devices/iio:deviceX/in_pressure_raw

Defined on file sysfs-bus-iio

Raw pressure measurement from channel Y. Units after application of scale and offset are kilopascal.

/sys/bus/iio/devices/iio:deviceX/in_proximity0_agc_gain

/sys/bus/iio/devices/iio:deviceX/in_proximity0_agc_gain_bias

Defined on file sysfs-bus-iio-isl29501

This sensor has an automatic gain control (agc) loop which sets the analog signal levels at an optimum level by controlling programmable gain amplifiers. The criteria for optimal gain is determined by the sensor.

Return the actual gain value as an integer in [0; 65536] range when read from.

The agc gain read when measuring crosstalk shall be written into in_proximity0_agc_gain_bias.

/sys/bus/iio/devices/iio:deviceX/in_proximity0_calib_phase_temp_a

/sys/bus/iio/devices/iio:deviceX/in_proximity0_calib_phase_temp_b

/sys/bus/iio/devices/iio:deviceX/in_proximity0_calib_phase_light_a

/sys/bus/iio/devices/iio:deviceX/in_proximity0_calib_phase_light_b

Defined on file sysfs-bus-iio-isl29501

The sensor is able to perform correction of distance measurements due to changing temperature and ambient light conditions. It can be programmed to correct for a second order error polynomial.

Phase data has to be collected when temperature and ambient light are modulated independently.

Then a least squares curve fit to a second order polynomial has to be generated from the data. The resultant curves have the form ax^2 + bx + c.

From those two curves, a and b coefficients shall be stored in in_proximity0_calib_phase_temp_a and in_proximity0_calib_phase_temp_b for temperature and in in_proximity0_calib_phase_light_a and in_proximity0_calib_phase_light_b for ambient light.

Those values must be integer in [0; 8355840] range.

Finally, the c constant is set by the sensor internally.

The value stored in sensor is displayed when read from.

/sys/bus/iio/devices/iio:deviceX/in_proximity3_comb_raw

Defined on file sysfs-bus-iio-sx9310

Proximity measurement indicating that some object is near the combined sensor. The combined sensor presents proximity measurements constructed by hardware by combining measurements taken from a given set of physical sensors.

/sys/bus/iio/devices/iio:deviceX/in_proximity<id>_setup

Defined on file sysfs-bus-iio-sx9324

SX9324 has 3 inputs, CS0, CS1 and CS2. Hardware layout defines if the input is

  • not connected (HZ),

  • grounded (GD),

  • connected to an antenna where it can act as a base (DS - data shield), or measured input (MI).

The sensor rotates measurement across 4 phases (PH0, PH1, PH2, PH3), where the inputs are configured and then measured.

By default, during the first phase, [PH0], CS0 is measured, while CS1 and CS2 are used as shields. cat in_proximity0_setup returns “MI,DS,DS”. [PH1], CS1 is measured, CS0 and CS2 are shield: cat in_proximity1_setup returns “DS,MI,DS”. [PH2], CS2 is measured, CS0 and CS1 are shield: cat in_proximity1_setup returns “DS,DS,MI”. [PH3], CS1 and CS2 are measured (combo mode): cat in_proximity1_setup returns “DS,MI,MI”.

Note, these are the chip default. Hardware layout will most likely dictate different output. The entry is read-only.

/sys/bus/iio/devices/iio:deviceX/in_proximity_input

Defined on file sysfs-bus-iio-proximity-as3935

Get the current distance in meters of storm (1km steps) 1000-40000 = distance in meters

What /sys/bus/iio/devices/iio:deviceX/noise_level_tripped When 1 the noise level is over the trip level and not reporting valid data

/sys/bus/iio/devices/iio:deviceX/in_proximity_nearlevel

Defined on file sysfs-bus-iio-proximity

Near level for proximity sensors. This is a single integer value that tells user space when an object should be considered close to the device. If the value read from the sensor is above or equal to the value in this file an object should typically be considered near.

/sys/bus/iio/devices/iio:deviceX/in_resistance_calibbias

Defined on file sysfs-bus-iio-chemical-sgp40

Set the bias value for the resistance which is used for calculation of in_concentration_input as follows:

x = (in_resistance_raw - in_resistance_calibbias) * 0.65

in_concentration_input = 500 / (1 + e^x)

Default value: 30000

/sys/bus/iio/devices/iio:deviceX/in_resistance_raw

/sys/bus/iio/devices/iio:deviceX/in_resistanceX_raw

/sys/bus/iio/devices/iio:deviceX/out_resistance_raw

/sys/bus/iio/devices/iio:deviceX/out_resistanceX_raw

Defined on file sysfs-bus-iio

Raw (unscaled no offset etc.) resistance reading. Units after application of scale and offset are ohms.

/sys/bus/iio/devices/iio:deviceX/in_rot_from_north_magnetic_tilt_comp_raw

/sys/bus/iio/devices/iio:deviceX/in_rot_from_north_true_tilt_comp_raw

/sys/bus/iio/devices/iio:deviceX/in_rot_from_north_magnetic_raw

/sys/bus/iio/devices/iio:deviceX/in_rot_from_north_true_raw

Defined on file sysfs-bus-iio

Raw value of rotation from true/magnetic north measured with or without compensation from tilt sensors.

/sys/bus/iio/devices/iio:deviceX/in_rot_quaternion_raw

Defined on file sysfs-bus-iio

Raw value of quaternion components using a format x y z w. Here x, y, and z component represents the axis about which a rotation will occur and w component represents the amount of rotation.

/sys/bus/iio/devices/iio:deviceX/in_rot_yaw_raw

/sys/bus/iio/devices/iio:deviceX/in_rot_pitch_raw

/sys/bus/iio/devices/iio:deviceX/in_rot_roll_raw

Defined on file sysfs-bus-iio

Raw (unscaled) euler angles readings. Units after application of scale are deg.

/sys/bus/iio/devices/iio:deviceX/in_shunt_resistor

Defined on file sysfs-bus-iio-ina2xx-adc

The value of the shunt resistor may be known only at runtime fom an eeprom content read by a client application. This attribute allows to set its value in ohms.

/sys/bus/iio/devices/iio:deviceX/in_shunt_resistorY

Defined on file sysfs-bus-iio-adc-pac1934

The value of the shunt resistor may be known only at runtime and set by a client application. This attribute allows to set its value in micro-ohms. X is the IIO index of the device. Y is the channel number. The value is used to calculate current, power and accumulated energy.

/sys/bus/iio/devices/iio:deviceX/in_temp8_raw

Defined on file sysfs-bus-iio-adc-mt6360

Indicated MT6360 IC junction temperature Calculating with scale and offset returns temperature in degree

/sys/bus/iio/devices/iio:deviceX/in_tempY_input

/sys/bus/iio/devices/iio:deviceX/in_temp_input

Defined on file sysfs-bus-iio

Scaled temperature measurement in milli degrees Celsius.

/sys/bus/iio/devices/iio:deviceX/in_temp_calibemissivity

/sys/bus/iio/devices/iio:deviceX/in_tempX_calibemissivity

/sys/bus/iio/devices/iio:deviceX/in_temp_object_calibemissivity

/sys/bus/iio/devices/iio:deviceX/in_tempX_object_calibemissivity

Defined on file sysfs-bus-iio

The emissivity ratio of the surface in the field of view of the contactless temperature sensor. Emissivity varies from 0 to 1, with 1 being the emissivity of a black body.

/sys/bus/iio/devices/iio:deviceX/in_temp_object_calibambient

/sys/bus/iio/devices/iio:deviceX/in_tempX_object_calibambient

Defined on file sysfs-bus-iio

Calibrated ambient temperature for object temperature calculation in milli degrees Celsius.

/sys/bus/iio/devices/iio:deviceX/in_temp_raw

/sys/bus/iio/devices/iio:deviceX/in_tempX_raw

/sys/bus/iio/devices/iio:deviceX/in_temp_x_raw

/sys/bus/iio/devices/iio:deviceX/in_temp_y_raw

/sys/bus/iio/devices/iio:deviceX/in_temp_ambient_raw

/sys/bus/iio/devices/iio:deviceX/in_temp_object_raw

Defined on file sysfs-bus-iio

Raw (unscaled no bias removal etc.) temperature measurement. If an axis is specified it generally means that the temperature sensor is associated with one part of a compound device (e.g. a gyroscope axis). The ambient and object modifiers distinguish between ambient (reference) and distant temperature for contact- less measurements. Units after application of scale and offset are milli degrees Celsius.

/sys/bus/iio/devices/iio:deviceX/in_temp_thermocouple_type

Defined on file sysfs-bus-iio

One of the following thermocouple types: B, E, J, K, N, R, S, T.

/sys/bus/iio/devices/iio:deviceX/in_voltage-voltage_filter_mode_available

Defined on file sysfs-bus-iio-adc-ad4130

Reading returns a list with the possible filter modes.

  • “sinc4” - Sinc 4. Excellent noise performance. Long 1st conversion time. No natural 50/60Hz rejection.

  • “sinc4+sinc1” - Sinc4 + averaging by 8. Low 1st conversion time.

  • “sinc3” - Sinc3. Moderate 1st conversion time. Good noise performance.

  • “sinc3+rej60” - Sinc3 + 60Hz rejection. At a sampling frequency of 50Hz, achieves simultaneous 50Hz and 60Hz rejection.

  • “sinc3+sinc1” - Sinc3 + averaging by 8. Low 1st conversion time. Best used with a sampling frequency of at least 216.19Hz.

  • “sinc3+pf1” - Sinc3 + Post Filter 1. 53dB rejection @ 50Hz, 58dB rejection @ 60Hz.

  • “sinc3+pf2” - Sinc3 + Post Filter 2. 70dB rejection @ 50Hz, 70dB rejection @ 60Hz.

  • “sinc3+pf3” - Sinc3 + Post Filter 3. 99dB rejection @ 50Hz, 103dB rejection @ 60Hz.

  • “sinc3+pf4” - Sinc3 + Post Filter 4. 103dB rejection @ 50Hz, 109dB rejection @ 60Hz.

/sys/bus/iio/devices/iio:deviceX/in_voltage0_raw

Defined on file sysfs-bus-iio-adc-mt6360

Indicated MT6360 USBID ADC which connected to connector ID pin. Calculating with scale and offset returns voltage in uV

/sys/bus/iio/devices/iio:deviceX/in_voltage10_raw

Defined on file sysfs-bus-iio-adc-mt6360

Indicated MT6360 TS ADC Calculating with scale and offset returns voltage in uV

/sys/bus/iio/devices/iio:deviceX/in_voltage1_raw

Defined on file sysfs-bus-iio-adc-mt6360

Indicated MT6360 VBUS ADC with lower accuracy(+-75mA) higher measure range(1~22mV) Calculating with scale and offset returns voltage in uV

/sys/bus/iio/devices/iio:deviceX/in_voltage2-voltage2_shorted_raw

Defined on file sysfs-bus-iio-adc-ad7192

Measure voltage from AIN2 pin connected to AIN(+) and AIN(-) shorted.

/sys/bus/iio/devices/iio:deviceX/in_voltage2_raw

Defined on file sysfs-bus-iio-adc-mt6360

Indicated MT6360 VBUS ADC with higher accuracy(+-30mA) lower measure range(1~9.76V) Calculating with scale and offset returns voltage in uV

/sys/bus/iio/devices/iio:deviceX/in_voltage3_raw

Defined on file sysfs-bus-iio-adc-mt6360

Indicated MT6360 VSYS ADC Calculating with scale and offset returns voltage in uV

/sys/bus/iio/devices/iio:deviceX/in_voltage4_raw

Defined on file sysfs-bus-iio-adc-mt6360

Indicated MT6360 VBAT ADC Calculating with scale and offset returns voltage in uV

/sys/bus/iio/devices/iio:deviceX/in_voltage9_raw

Defined on file sysfs-bus-iio-adc-mt6360

Indicated MT6360 VREF_TS ADC Calculating with scale and offset returns voltage in uV

/sys/bus/iio/devices/iio:deviceX/in_voltageX_sampling_frequency

/sys/bus/iio/devices/iio:deviceX/in_powerY_sampling_frequency

/sys/bus/iio/devices/iio:deviceX/in_currentZ_sampling_frequency

Defined on file sysfs-bus-iio

Some devices have separate controls of sampling frequency for individual channels. If multiple channels are enabled in a scan, then the sampling_frequency of the scan may be computed from the per channel sampling frequencies.

/sys/bus/iio/devices/iio:deviceX/in_voltageY-voltageZ_balance_switch_en

Defined on file sysfs-bus-iio-adc-ad7280a

Used to enable an output for balancing cells for time controlled via in_voltage_Y-voltageZ_balance_switch_timer.

/sys/bus/iio/devices/iio:deviceX/in_voltageY-voltageZ_balance_switch_timer

Defined on file sysfs-bus-iio-adc-ad7280a

Time in seconds for which balance switch will be turned on. Multiple of 71.5 seconds.

/sys/bus/iio/devices/iio:deviceX/in_voltageY-voltageZ_filter_mode

Defined on file sysfs-bus-iio-adc-ad4130

Set the filter mode of the differential channel. When the filter mode changes, the in_voltageY-voltageZ_sampling_frequency and in_voltageY-voltageZ_sampling_frequency_available attributes might also change to accommodate the new filter mode. If the current sampling frequency is out of range for the new filter mode, the sampling frequency will be changed to the closest valid one.

/sys/bus/iio/devices/iio:deviceX/in_voltageY-voltageZ_raw

Defined on file sysfs-bus-iio

Raw (unscaled) differential voltage measurement equivalent to channel Y - channel Z where these channel numbers apply to the physically equivalent inputs when non differential readings are separately available. In differential only parts, then all that is required is a consistent labeling. Units after application of scale and offset are millivolts.

/sys/bus/iio/devices/iio:deviceX/in_voltageY_calibscale

/sys/bus/iio/devices/iio:deviceX/in_voltageY_supply_calibscale

/sys/bus/iio/devices/iio:deviceX/in_voltageY_i_calibscale

/sys/bus/iio/devices/iio:deviceX/in_voltageY_q_calibscale

/sys/bus/iio/devices/iio:deviceX/in_voltage_i_calibscale

/sys/bus/iio/devices/iio:deviceX/in_voltage_q_calibscale

/sys/bus/iio/devices/iio:deviceX/in_altvoltage_calibscale

/sys/bus/iio/devices/iio:deviceX/in_voltage_calibscale

/sys/bus/iio/devices/iio:deviceX/in_accel_x_calibscale

/sys/bus/iio/devices/iio:deviceX/in_accel_y_calibscale

/sys/bus/iio/devices/iio:deviceX/in_accel_z_calibscale

/sys/bus/iio/devices/iio:deviceX/in_anglvel_x_calibscale

/sys/bus/iio/devices/iio:deviceX/in_anglvel_y_calibscale

/sys/bus/iio/devices/iio:deviceX/in_anglvel_z_calibscale

/sys/bus/iio/devices/iio:deviceX/in_illuminance0_calibscale

/sys/bus/iio/devices/iio:deviceX/in_proximity0_calibscale

/sys/bus/iio/devices/iio:deviceX/in_pressureY_calibscale

/sys/bus/iio/devices/iio:deviceX/in_pressure_calibscale

/sys/bus/iio/devices/iio:deviceX/in_illuminance_calibscale

Defined on file sysfs-bus-iio

Hardware applied calibration scale factor (assumed to fix production inaccuracies). If shared across all channels, <type>_calibscale is used.

/sys/bus/iio/devices/iio:deviceX/in_voltageY_dither_enable

Defined on file sysfs-bus-iio-dac-ad5766

Dither enable. Write 1 to enable dither or 0 to disable it.

/sys/bus/iio/devices/iio:deviceX/in_voltageY_dither_invert

Defined on file sysfs-bus-iio-dac-ad5766

Inverts the dither applied to the selected DAC channel. Dither is not inverted by default. Write “1” to invert dither.

/sys/bus/iio/devices/iio:deviceX/in_voltageY_dither_scale

Defined on file sysfs-bus-iio-dac-ad5766

Scales the dither before it is applied to the selected channel.

/sys/bus/iio/devices/iio:deviceX/in_voltageY_dither_scale_available

Defined on file sysfs-bus-iio-dac-ad5766

Returns possible scalings available for the current channel.

/sys/bus/iio/devices/iio:deviceX/in_voltageY_dither_source

Defined on file sysfs-bus-iio-dac-ad5766

Selects dither source applied to the selected channel. Write “0” to select N0 source, write “1” to select N1 source.

/sys/bus/iio/devices/iio:deviceX/in_voltageY_label

/sys/bus/iio/devices/iio:deviceX/out_voltageY_label

Defined on file sysfs-bus-iio

Optional symbolic label to a device channel. If a label is defined for this channel add that to the channel specific attributes. This is useful for userspace to be able to better identify an individual channel.

/sys/bus/iio/devices/iio:deviceX/in_voltageY_raw

/sys/bus/iio/devices/iio:deviceX/in_voltageY_supply_raw

/sys/bus/iio/devices/iio:deviceX/in_voltageY_i_raw

/sys/bus/iio/devices/iio:deviceX/in_voltageY_q_raw

Defined on file sysfs-bus-iio

Raw (unscaled no bias removal etc.) voltage measurement from channel Y. In special cases where the channel does not correspond to externally available input one of the named versions may be used. The number must always be specified and unique to allow association with event codes. Units after application of scale and offset are millivolts.

Channels with ‘i’ and ‘q’ modifiers always exist in pairs and both channels refer to the same signal. The ‘i’ channel contains the in-phase component of the signal while the ‘q’ channel contains the quadrature component.

/sys/bus/iio/devices/iio:deviceX/in_voltageY_scale

/sys/bus/iio/devices/iio:deviceX/in_voltageY_i_scale

/sys/bus/iio/devices/iio:deviceX/in_voltageY_q_scale

/sys/bus/iio/devices/iio:deviceX/in_voltageY_supply_scale

/sys/bus/iio/devices/iio:deviceX/in_voltage_scale

/sys/bus/iio/devices/iio:deviceX/in_voltage_i_scale

/sys/bus/iio/devices/iio:deviceX/in_voltage_q_scale

/sys/bus/iio/devices/iio:deviceX/in_voltage-voltage_scale

/sys/bus/iio/devices/iio:deviceX/out_voltageY_scale

/sys/bus/iio/devices/iio:deviceX/out_altvoltageY_scale

/sys/bus/iio/devices/iio:deviceX/in_currentY_scale

/sys/bus/iio/devices/iio:deviceX/in_currentY_supply_scale

/sys/bus/iio/devices/iio:deviceX/in_current_scale

/sys/bus/iio/devices/iio:deviceX/in_currentY_i_scale

/sys/bus/iio/devices/iio:deviceX/in_currentY_q_scale

/sys/bus/iio/devices/iio:deviceX/in_current_i_scale

/sys/bus/iio/devices/iio:deviceX/in_current_q_scale

/sys/bus/iio/devices/iio:deviceX/in_accel_scale

/sys/bus/iio/devices/iio:deviceX/in_accel_peak_scale

/sys/bus/iio/devices/iio:deviceX/in_anglvel_scale

/sys/bus/iio/devices/iio:deviceX/in_energy_scale

/sys/bus/iio/devices/iio:deviceX/in_distance_scale

/sys/bus/iio/devices/iio:deviceX/in_magn_scale

/sys/bus/iio/devices/iio:deviceX/in_magn_x_scale

/sys/bus/iio/devices/iio:deviceX/in_magn_y_scale

/sys/bus/iio/devices/iio:deviceX/in_magn_z_scale

/sys/bus/iio/devices/iio:deviceX/in_rot_from_north_magnetic_scale

/sys/bus/iio/devices/iio:deviceX/in_rot_from_north_true_scale

/sys/bus/iio/devices/iio:deviceX/in_rot_from_north_magnetic_tilt_comp_scale

/sys/bus/iio/devices/iio:deviceX/in_rot_from_north_true_tilt_comp_scale

/sys/bus/iio/devices/iio:deviceX/in_pressureY_scale

/sys/bus/iio/devices/iio:deviceX/in_pressure_scale

/sys/bus/iio/devices/iio:deviceX/in_humidityrelative_scale

/sys/bus/iio/devices/iio:deviceX/in_velocity_sqrt(x^2+y^2+z^2)_scale

/sys/bus/iio/devices/iio:deviceX/in_illuminance_scale

/sys/bus/iio/devices/iio:deviceX/in_countY_scale

/sys/bus/iio/devices/iio:deviceX/in_deltaangl_scale

/sys/bus/iio/devices/iio:deviceX/in_deltavelocity_scale

/sys/bus/iio/devices/iio:deviceX/in_angl_scale

/sys/bus/iio/devices/iio:deviceX/in_intensity_x_scale

/sys/bus/iio/devices/iio:deviceX/in_intensity_y_scale

/sys/bus/iio/devices/iio:deviceX/in_intensity_z_scale

/sys/bus/iio/devices/iio:deviceX/in_concentration_co2_scale

Defined on file sysfs-bus-iio

If known for a device, scale to be applied to <type>Y[_name]_raw post addition of <type>[Y][_name]_offset in order to obtain the measured value in <type> units as specified in <type>[Y][_name]_raw documentation. If shared across all in channels then Y and <x|y|z> are not present and the value is called <type>[Y][_name]_scale. The peak modifier means this value is applied to <type>Y[_name]_peak_raw values.

/sys/bus/iio/devices/iio:deviceX/in_voltageY_sensing_mode

Defined on file sysfs-bus-iio-adc-hi8435

Program sensor type for threshold detector inputs. Could be either “GND-Open” or “Supply-Open” mode. Y is a threshold detector input channel. Channels 0..7, 8..15, 16..23 and 24..31 has common sensor types.

/sys/bus/iio/devices/iio:deviceX/in_voltage_filterY_notch_center

Defined on file sysfs-bus-iio-adc-max11410

Center frequency of the notch filter in Hz.

/sys/bus/iio/devices/iio:deviceX/in_voltage_filterY_notch_en

Defined on file sysfs-bus-iio-adc-max11410

Enable or disable a notch filter.

/sys/bus/iio/devices/iio:deviceX/in_voltage_spi_clk_freq

Defined on file sysfs-bus-iio-dfsdm-adc-stm32

For audio purpose only.

Used by audio driver to set/get the spi input frequency.

This is mandatory if DFSDM is slave on SPI bus, to provide information on the SPI clock frequency during runtime Notice that the SPI frequency should be a multiple of sample frequency to ensure the precision.

if DFSDM input is SPI master:

Reading SPI clkout frequency, error on writing

If DFSDM input is SPI Slave:

Reading returns value previously set. Writing value before starting conversions.

/sys/bus/iio/devices/iio:deviceX/in_voltagex_sys_calibration

Defined on file sysfs-bus-iio-adc-ad7192

Initiates the system calibration procedure. This is done on a single channel at a time. Write ‘1’ to start the calibration.

/sys/bus/iio/devices/iio:deviceX/in_voltagex_sys_calibration_mode

Defined on file sysfs-bus-iio-adc-ad7192

Sets up the calibration mode used in the system calibration procedure. Reading returns the current calibration mode. Writing sets the system calibration mode.

/sys/bus/iio/devices/iio:deviceX/in_voltagex_sys_calibration_mode_available

Defined on file sysfs-bus-iio-adc-ad7192

Reading returns a list with the possible calibration modes. There are two available options: “zero_scale” - calibrate to zero scale “full_scale” - calibrate to full scale

/sys/bus/iio/devices/iio:deviceX/label

Defined on file sysfs-bus-iio

Optional symbolic label for a device. This is useful for userspace to be able to better identify an individual device.

The contents of the label are free-form, but there are some standardized uses:

For proximity sensors which give the proximity (of a person) to a certain wlan or wwan antenna the following standardized labels are used:

  • “proximity-wifi”

  • “proximity-lte”

  • “proximity-wifi-lte”

  • “proximity-wifi-left”

  • “proximity-wifi-right”

These are used to indicate to userspace that these proximity sensors may be used to tune transmit power to ensure that Specific Absorption Rate (SAR) limits are honored. The “-left” and “-right” labels are for devices with multiple antennas.

In some laptops/tablets the standardized proximity sensor labels instead indicate proximity to a specific part of the device:

  • “proximity-palmrest” indicates proximity to the keyboard’s palmrest

  • “proximity-palmrest-left” indicates proximity to the left part of the palmrest

  • “proximity-palmrest-right” indicates proximity to the right part of the palmrest

  • “proximity-lap” indicates the device is being used on someone’s lap

Note “proximity-lap” is special in that its value may be calculated by firmware from other sensor readings, rather then being a raw sensor reading.

For accelerometers used in 2-in-1s with 360° (yoga-style) hinges, which have an accelerometer in both their base and their display, the following standardized labels are used:

  • “accel-base”

  • “accel-display”

For devices where an accelerometer is housed in the swivel camera subassembly (for AR application), the following standardized label is used:

  • “accel-camera”

/sys/bus/iio/devices/iio:deviceX/location

Defined on file sysfs-bus-iio-cros-ec

This attribute returns a string with the physical location where the motion sensor is placed. For example, in a laptop a motion sensor can be located on the base or on the lid. Current valid values are ‘base’ and ‘lid’.

/sys/bus/iio/devices/iio:deviceX/meas_conf

/sys/bus/iio/devices/iio:deviceX/meas_conf_available

Defined on file sysfs-bus-iio-magnetometer-hmc5843

Current configuration and available configurations for the bias current.

normal

Normal measurement configurations (default)

positivebias

Positive bias configuration

negativebias

Negative bias configuration

disabled

Only available on HMC5983. Disables magnetic sensor and enables temperature sensor.
Note:

The effect of this configuration may vary according to the device. For exact documentation check the device’s datasheet.

/sys/bus/iio/devices/iio:deviceX/mount_matrix

/sys/bus/iio/devices/iio:deviceX/in_mount_matrix

/sys/bus/iio/devices/iio:deviceX/out_mount_matrix

/sys/bus/iio/devices/iio:deviceX/in_anglvel_mount_matrix

/sys/bus/iio/devices/iio:deviceX/in_accel_mount_matrix

Defined on file sysfs-bus-iio

Mounting matrix for IIO sensors. This is a rotation matrix which informs userspace about sensor chip’s placement relative to the main hardware it is mounted on.

Main hardware placement is defined according to the local reference frame related to the physical quantity the sensor measures.

Given that the rotation matrix is defined in a board specific way (platform data and / or device-tree), the main hardware reference frame definition is left to the implementor’s choice (see below for a magnetometer example).

Applications should apply this rotation matrix to samples so that when main hardware reference frame is aligned onto local reference frame, then sensor chip reference frame is also perfectly aligned with it.

Matrix is a 3x3 unitary matrix and typically looks like [0, 1, 0; 1, 0, 0; 0, 0, -1]. Identity matrix [1, 0, 0; 0, 1, 0; 0, 0, 1] means sensor chip and main hardware are perfectly aligned with each other.

For example, a mounting matrix for a magnetometer sensor informs userspace about sensor chip’s ORIENTATION relative to the main hardware.

More specifically, main hardware orientation is defined with respect to the LOCAL EARTH GEOMAGNETIC REFERENCE FRAME where :

  • Y is in the ground plane and positive towards magnetic North ;

  • X is in the ground plane, perpendicular to the North axis and positive towards the East ;

  • Z is perpendicular to the ground plane and positive upwards.

An implementor might consider that for a hand-held device, a ‘natural’ orientation would be ‘front facing camera at the top’. The main hardware reference frame could then be described as :

  • Y is in the plane of the screen and is positive towards the top of the screen ;

  • X is in the plane of the screen, perpendicular to Y axis, and positive towards the right hand side of the screen ;

  • Z is perpendicular to the screen plane and positive out of the screen.

Another example for a quadrotor UAV might be :

  • Y is in the plane of the propellers and positive towards the front-view camera;

  • X is in the plane of the propellers, perpendicular to Y axis, and positive towards the starboard side of the UAV ;

  • Z is perpendicular to propellers plane and positive upwards.

/sys/bus/iio/devices/iio:deviceX/name

Defined on file sysfs-bus-iio

Description of the physical chip / device for device X. Typically a part number.

/sys/bus/iio/devices/iio:deviceX/out_altvoltageY_frequency

Defined on file sysfs-bus-iio

Output frequency for channel Y in Hz. The number must always be specified and unique if the output corresponds to a single channel. Some drivers have additional constraints: ADF4371 has an integrated VCO with fundamendal output frequency ranging from 4000000000 Hz 8000000000 Hz.

out_altvoltage0_frequency:

A divide by 1, 2, 4, 8, 16, 32 or circuit generates frequencies from 62500000 Hz to 8000000000 Hz.

out_altvoltage1_frequency:

This channel duplicates the channel 0 frequency

out_altvoltage2_frequency:

A frequency doubler generates frequencies from 8000000000 Hz to 16000000000 Hz.

out_altvoltage3_frequency:

A frequency quadrupler generates frequencies from 16000000000 Hz to 32000000000 Hz.

Note: writes to one of the channels will affect the frequency of all the other channels, since it involves changing the VCO fundamental output frequency.

/sys/bus/iio/devices/iio:deviceX/out_altvoltageY_frequency_increment

Defined on file sysfs-bus-iio-impedance-analyzer-ad5933

Frequency increment in Hz (step size) between consecutive frequency points along the sweep.

/sys/bus/iio/devices/iio:deviceX/out_altvoltageY_frequency_points

Defined on file sysfs-bus-iio-impedance-analyzer-ad5933

Number of frequency points (steps) in the frequency sweep. This value, in conjunction with the out_altvoltageY_frequency_start and the out_altvoltageY_frequency_increment, determines the frequency sweep range for the sweep operation.

/sys/bus/iio/devices/iio:deviceX/out_altvoltageY_frequency_resolution

Defined on file sysfs-bus-iio-frequency-adf4350

Stores channel Y frequency resolution/channel spacing in Hz. The value given directly influences the MODULUS used by the fractional-N PLL. It is assumed that the algorithm that is used to compute the various dividers, is able to generate proper values for multiples of channel spacing.

/sys/bus/iio/devices/iio:deviceX/out_altvoltageY_frequency_start

Defined on file sysfs-bus-iio-impedance-analyzer-ad5933

Frequency sweep start frequency in Hz.

/sys/bus/iio/devices/iio:deviceX/out_altvoltageY_name

Defined on file sysfs-bus-iio-frequency-adf4371

Reading returns the datasheet name for channel Y:

out_altvoltage0_name: RF8x
out_altvoltage1_name: RFAUX8x
out_altvoltage2_name: RF16x
out_altvoltage3_name: RF32x

/sys/bus/iio/devices/iio:deviceX/out_altvoltageY_phase

Defined on file sysfs-bus-iio

Phase in radians of one frequency/clock output Y (out_altvoltageY) relative to another frequency/clock output (out_altvoltageZ) of the device X. The number must always be specified and unique if the output corresponds to a single channel.

/sys/bus/iio/devices/iio:deviceX/out_altvoltageY_refin_frequency

Defined on file sysfs-bus-iio-frequency-adf4350

Sets channel Y REFin frequency in Hz. In some clock chained applications, the reference frequency used by the PLL may change during runtime. This attribute allows the user to adjust the reference frequency accordingly. The value written has no effect until out_altvoltageY_frequency is updated. Consider to use out_altvoltageY_powerdown to power down the PLL and its RFOut buffers during REFin changes.

/sys/bus/iio/devices/iio:deviceX/out_altvoltageY_settling_cycles

Defined on file sysfs-bus-iio-impedance-analyzer-ad5933

Number of output excitation cycles (settling time cycles) that are allowed to pass through the unknown impedance, after each frequency increment, and before the ADC is triggered to perform a conversion sequence of the response signal.

/sys/bus/iio/devices/iio:deviceX/out_conversion_mode

Defined on file sysfs-bus-iio-vf610

Specifies the hardware conversion mode used within DAC. The two available modes are “high-power” and “low-power”, where “low-power” mode is the default mode.

/sys/bus/iio/devices/iio:deviceX/out_currentY_currentZ_raw

Defined on file sysfs-bus-iio-light-lm3533-als

Set the output current for channel out_currentY when in zone Z (0..255), where Y in 0..2 and Z in 0..4.

These values correspond to the ALS-mapper target registers for ALS-mapper Y + 1.

Note that out_currentY_raw provides the current for the current zone.

/sys/bus/iio/devices/iio:deviceX/out_currentY_raw

Defined on file sysfs-bus-iio

Set/get output current for channel Y. Units after application of scale and offset are milliamps. For some devices current channels are used to specify current supplied to elements used in taking a measurement of a different type. E.g. LED currents.

/sys/bus/iio/devices/iio:deviceX/out_current_heater_raw

/sys/bus/iio/devices/iio:deviceX/out_current_heater_raw_available

Defined on file sysfs-bus-iio-humidity

Controls the heater device within the humidity sensor to get rid of excess condensation.

In some devices, this is just a switch in which case 0 = OFF, and 1 = ON.

/sys/bus/iio/devices/iio:deviceX/out_humidityrelative_raw

Defined on file sysfs-bus-iio-chemical-sgp40

Set the relative humidity. This value is sent to the sensor for humidity compensation. Default value: 50000 (50 % relative humidity)

/sys/bus/iio/devices/iio:deviceX/out_resistance_raw_available

Defined on file sysfs-bus-iio-potentiometer-mcp4531

The range of available values represented as the minimum value, the step and the maximum value, all enclosed in square brackets. Example: [0 1 256]

/sys/bus/iio/devices/iio:deviceX/out_temp_raw

Defined on file sysfs-bus-iio-chemical-sgp40

Set the temperature. This value is sent to the sensor for temperature compensation. Default value: 25000 (25 °C)

/sys/bus/iio/devices/iio:deviceX/out_voltageY&Z_raw

/sys/bus/iio/devices/iio:deviceX/out_altvoltageY&Z_raw

Defined on file sysfs-bus-iio

Raw (unscaled, no bias etc.) output voltage for an aggregate of channel Y, channel Z, etc. This interface is available in cases where a single output sets the value for multiple channels simultaneously.

/sys/bus/iio/devices/iio:deviceX/out_voltageY_dither_en

Defined on file sysfs-bus-iio-dac-ltc2688

Dither enable. Write 1 to enable dither or 0 to disable it. This is useful for changing the dither parameters. They way it should be done is:

  • disable dither operation;

  • change dither parameters (eg: frequency, phase...);

  • enabled dither operation

/sys/bus/iio/devices/iio:deviceX/out_voltageY_dither_frequency

Defined on file sysfs-bus-iio-dac-ltc2688

Sets the dither signal frequency. Units are in Hz.

/sys/bus/iio/devices/iio:deviceX/out_voltageY_dither_frequency_available

Defined on file sysfs-bus-iio-dac-ltc2688

Returns the available values for the dither frequency.

/sys/bus/iio/devices/iio:deviceX/out_voltageY_dither_offset

Defined on file sysfs-bus-iio-dac-ltc2688

Offset applied to out_voltageY_dither_raw. Read only attribute always set to 0.

/sys/bus/iio/devices/iio:deviceX/out_voltageY_dither_phase

Defined on file sysfs-bus-iio-dac-ltc2688

Sets the dither signal phase. Units are in Radians.

/sys/bus/iio/devices/iio:deviceX/out_voltageY_dither_phase_available

Defined on file sysfs-bus-iio-dac-ltc2688

Returns the available values for the dither phase.

/sys/bus/iio/devices/iio:deviceX/out_voltageY_dither_raw

Defined on file sysfs-bus-iio-dac-ltc2688

This raw, unscaled value refers to the dither signal amplitude. The same scale as in out_voltageY_raw applies. However, the offset might be different as it’s always 0 for this attribute.

/sys/bus/iio/devices/iio:deviceX/out_voltageY_dither_raw_available

Defined on file sysfs-bus-iio-dac-ltc2688

Available range for dither raw amplitude values.

/sys/bus/iio/devices/iio:deviceX/out_voltageY_hardwaregain

/sys/bus/iio/devices/iio:deviceX/in_intensity_hardwaregain

/sys/bus/iio/devices/iio:deviceX/in_intensity_red_hardwaregain

/sys/bus/iio/devices/iio:deviceX/in_intensity_green_hardwaregain

/sys/bus/iio/devices/iio:deviceX/in_intensity_blue_hardwaregain

/sys/bus/iio/devices/iio:deviceX/in_intensity_clear_hardwaregain

Defined on file sysfs-bus-iio

Hardware applied gain factor. If shared across all channels, <type>_hardwaregain is used.

/sys/bus/iio/devices/iio:deviceX/out_voltageY_operating_mode

Defined on file sysfs-bus-iio-ad9739a

DAC operating mode. One of the following modes can be selected:

  • normal: This is DAC normal mode.

  • mixed-mode: In this mode the output is effectively chopped at

    the DAC sample rate. This has the effect of reducing the power of the fundamental signal while increasing the power of the images centered around the DAC sample rate, thus improving the output power of these images.

/sys/bus/iio/devices/iio:deviceX/out_voltageY_operating_mode_available

Defined on file sysfs-bus-iio-ad9739a

Available operating modes.

/sys/bus/iio/devices/iio:deviceX/out_voltageY_powerdown_mode

/sys/bus/iio/devices/iio:deviceX/out_voltage_powerdown_mode

/sys/bus/iio/devices/iio:deviceX/out_altvoltageY_powerdown_mode

/sys/bus/iio/devices/iio:deviceX/out_altvoltage_powerdown_mode

Defined on file sysfs-bus-iio

Specifies the output powerdown mode. DAC output stage is disconnected from the amplifier and 1kohm_to_gnd: connected to ground via an 1kOhm resistor, 2.5kohm_to_gnd: connected to ground via a 2.5kOhm resistor, 6kohm_to_gnd: connected to ground via a 6kOhm resistor, 20kohm_to_gnd: connected to ground via a 20kOhm resistor, 90kohm_to_gnd: connected to ground via a 90kOhm resistor, 100kohm_to_gnd: connected to ground via an 100kOhm resistor, 125kohm_to_gnd: connected to ground via an 125kOhm resistor, 500kohm_to_gnd: connected to ground via a 500kOhm resistor, 640kohm_to_gnd: connected to ground via a 640kOhm resistor, three_state: left floating. For a list of available output power down options read outX_powerdown_mode_available. If Y is not present the mode is shared across all outputs.

/sys/bus/iio/devices/iio:deviceX/out_voltageY_powerdown

/sys/bus/iio/devices/iio:deviceX/out_voltage_powerdown

/sys/bus/iio/devices/iio:deviceX/out_altvoltageY_powerdown

/sys/bus/iio/devices/iio:deviceX/out_altvoltage_powerdown

Defined on file sysfs-bus-iio

Writing 1 causes output Y to enter the power down mode specified by the corresponding outY_powerdown_mode. DAC output stage is disconnected from the amplifier. Clearing returns to normal operation. Y may be suppressed if all outputs are controlled together.

/sys/bus/iio/devices/iio:deviceX/out_voltageY_raw0

/sys/bus/iio/devices/iio:deviceX/out_voltageY_raw1

Defined on file sysfs-bus-iio-dac-ltc2688

It has the same meaning as out_voltageY_raw. This attribute is specific to toggle enabled channels and refers to the DAC output code in INPUT_A (_raw0) and INPUT_B (_raw1). The same scale and offset as in out_voltageY_raw applies.

/sys/bus/iio/devices/iio:deviceX/out_voltageY_raw_available

Defined on file sysfs-bus-iio-dac-dpot-dac

The range of available values represented as the minimum value, the step and the maximum value, all enclosed in square brackets. Example: [0 1 256]

/sys/bus/iio/devices/iio:deviceX/out_voltageY_raw

/sys/bus/iio/devices/iio:deviceX/out_altvoltageY_raw

Defined on file sysfs-bus-iio

Raw (unscaled, no bias etc.) output voltage for channel Y. The number must always be specified and unique if the output corresponds to a single channel. While DAC like devices typically use out_voltage, a continuous frequency generating device, such as a DDS or PLL should use out_altvoltage.

/sys/bus/iio/devices/iio:deviceX/out_voltageY_symbol

Defined on file sysfs-bus-iio-dac-ltc2688

Performs a SW toggle. This attribute is specific to toggle enabled channels and allows to toggle between out_voltageY_raw0 and out_voltageY_raw1 through software. Writing 0 will select out_voltageY_raw0 while 1 selects out_voltageY_raw1.

/sys/bus/iio/devices/iio:deviceX/out_voltageY_toggle_en

Defined on file sysfs-bus-iio-dac-ltc2688

Toggle enable. Write 1 to enable toggle or 0 to disable it. This is useful when one wants to change the DAC output codes. The way it should be done is:

  • disable toggle operation;

  • change out_voltageY_raw0 and out_voltageY_raw1;

  • enable toggle operation.

/sys/bus/iio/devices/iio:deviceX/oversampling_ratio

Defined on file sysfs-bus-iio

Hardware dependent ADC oversampling. Controls the sampling ratio of the digital filter if available.

/sys/bus/iio/devices/iio:deviceX/oversampling_ratio_available

Defined on file sysfs-bus-iio

Hardware dependent values supported by the oversampling filter.

/sys/bus/iio/devices/iio:deviceX/pll2_feedback_clk_present

/sys/bus/iio/devices/iio:deviceX/pll2_reference_clk_present

/sys/bus/iio/devices/iio:deviceX/pll1_reference_clk_a_present

/sys/bus/iio/devices/iio:deviceX/pll1_reference_clk_b_present

/sys/bus/iio/devices/iio:deviceX/pll1_reference_clk_test_present

/sys/bus/iio/devices/iio:deviceX/vcxo_clk_present

Defined on file sysfs-bus-iio-frequency-ad9523

Reading returns either ‘1’ or ‘0’.

‘1’ means that the clock in question is present.

‘0’ means that the clock is missing.

/sys/bus/iio/devices/iio:deviceX/pllY_locked

Defined on file sysfs-bus-iio-frequency-ad9523

Reading returns either ‘1’ or ‘0’. ‘1’ means that the pllY is locked.

/sys/bus/iio/devices/iio:deviceX/proximity_on_chip_ambient_infrared_suppression

Defined on file sysfs-bus-iio-light-isl29018

From ISL29018 Data Sheet (FN6619.4, Oct 8, 2012) regarding the infrared suppression:

Scheme 0, makes full n (4, 8, 12, 16) bits (unsigned) proximity detection. The range of Scheme 0 proximity count is from 0 to 2^n. Logic 1 of this bit, Scheme 1, makes n-1 (3, 7, 11, 15) bits (2’s complementary) proximity_less_ambient detection. The range of Scheme 1 proximity count is from -2^(n-1) to 2^(n-1). The sign bit is extended for resolutions less than 16. While Scheme 0 has wider dynamic range, Scheme 1 proximity detection is less affected by the ambient IR noise variation.

0

Sensing IR from LED and ambient

1

Sensing IR from LED with ambient IR rejection

/sys/bus/iio/devices/iio:deviceX/sampling_frequency_available

/sys/bus/iio/devices/iio:deviceX/in_intensity_sampling_frequency_available

/sys/bus/iio/devices/iio:deviceX/in_proximity_sampling_frequency_available

/sys/.../iio:deviceX/buffer/sampling_frequency_available

/sys/bus/iio/devices/triggerX/sampling_frequency_available

Defined on file sysfs-bus-iio

When the internal sampling clock can only take a specific set of frequencies, we can specify the available values with:

  • a small discrete set of values like “0 2 4 6 8”

  • a range with minimum, step and maximum frequencies like “[min step max]”

/sys/bus/iio/devices/iio:deviceX/sampling_frequency

/sys/bus/iio/devices/iio:deviceX/in_intensity_sampling_frequency

/sys/bus/iio/devices/iio:deviceX/buffer/sampling_frequency

/sys/bus/iio/devices/triggerX/sampling_frequency

Defined on file sysfs-bus-iio

Some devices have internal clocks. This parameter sets the resulting sampling frequency. In many devices this parameter has an effect on input filters etc. rather than simply controlling when the input is sampled. As this affects data ready triggers, hardware buffers and the sysfs direct access interfaces, it may be found in any of the relevant directories. If it affects all of the above then it is to be found in the base device directory.

The stm32-timer-trigger has the additional characteristic that a sampling_frequency of 0 is defined to stop sampling.

/sys/bus/iio/devices/iio:deviceX/sensor_max_range

Defined on file sysfs-bus-iio-distance-srf08

Show or set the maximum range between the sensor and the first object echoed in meters. Default value is 6.020. This setting limits the time the driver is waiting for a echo.

Showing the range of available values is represented as the minimum value, the step and the maximum value, all enclosed in square brackets.

Example:

[0.043 0.043 11.008]

/sys/bus/iio/devices/iio:deviceX/sensor_sensitivity

Defined on file sysfs-bus-iio-proximity

Proximity sensors sometimes have a controllable amplifier on the signal from which time of flight measurements are taken. The appropriate values to take is dependent on both the sensor and its operating environment: * as3935 (0-31 range) 18 = indoors (default) 14 = outdoors

/sys/bus/iio/devices/iio:deviceX/serialnumber

Defined on file sysfs-bus-iio

An example format is 16-bytes, 2-digits-per-byte, HEX-string representing the sensor unique ID number.

/sys/bus/iio/devices/iio:deviceX/start_cleaning

Defined on file sysfs-bus-iio-sps30

Writing 1 starts sensor self cleaning. Internal fan accelerates to its maximum speed and keeps spinning for about 10 seconds in order to blow out accumulated dust.

/sys/bus/iio/devices/iio:deviceX/store_eeprom

Defined on file sysfs-bus-iio

Writing ‘1’ stores the current device configuration into on-chip EEPROM. After power-up or chip reset the device will automatically load the saved configuration.

/sys/bus/iio/devices/iio:deviceX/sync_dividers

Defined on file sysfs-bus-iio-frequency-ad9523

Writing ‘1’ triggers the clock distribution synchronization functionality. All dividers are reset and the channels start with their predefined phase offsets (out_altvoltageY_phase). Writing this file has the effect as driving the external /SYNC pin low.

/sys/bus/iio/devices/iio:deviceX/sys_calibration_auto_status

Defined on file sysfs-bus-iio-bno055

Reports the status for the IMU overall autocalibration. Can be 0 (calibration non even enabled) or 1 to 5 where the greater the number, the better the calibration status.

/sys/bus/iio/devices/iio:deviceX/trigger/current_trigger

Defined on file sysfs-bus-iio

The name of the trigger source being used, as per string given in /sys/class/iio/triggerY/name.

/sys/bus/iio/devices/iio_sysfs_trigger/add_trigger

Defined on file sysfs-bus-iio-trigger-sysfs

This attribute is provided by the iio-trig-sysfs stand-alone driver and it is used to activate the creation of a new trigger. In order to achieve this, one should write a positive integer into the associated file, which will serve as the id of the trigger. If the trigger with the specified id is already present in the system, an invalid argument message will be returned.

/sys/bus/iio/devices/iio_sysfs_trigger/remove_trigger

Defined on file sysfs-bus-iio-trigger-sysfs

This attribute is used to unregister and delete a previously created trigger from the list of available triggers. In order to achieve this, one should write a positive integer into the associated file, representing the id of the trigger that needs to be removed. If the trigger can’t be found, an invalid argument message will be returned to the user.

/sys/bus/iio/devices/triggerX

Defined on file sysfs-bus-iio

An event driven driver of data capture to an in kernel buffer. May be provided by a device driver that also has an IIO device based on hardware generated events (e.g. data ready) or provided by a separate driver for other hardware (e.g. periodic timer, GPIO or high resolution timer).

Contains trigger type specific elements. These do not generalize well and hence are not documented in this file. X is the IIO index of the trigger.

/sys/bus/iio/devices/triggerX/master_mode

Defined on file sysfs-bus-iio-timer-stm32

Reading returns the current master modes. Writing set the master mode

/sys/bus/iio/devices/triggerX/master_mode_available

Defined on file sysfs-bus-iio-timer-stm32

Reading returns the list possible master modes which are:

  • “reset”

    The UG bit from the TIMx_EGR register is used as trigger output (TRGO).

  • “enable”

    The Counter Enable signal CNT_EN is used as trigger output.

  • “update”

    The update event is selected as trigger output. For instance a master timer can then be used as a prescaler for a slave timer.

  • “compare_pulse”

    The trigger output send a positive pulse when the CC1IF flag is to be set.

  • “OC1REF”

    OC1REF signal is used as trigger output.

  • “OC2REF”

    OC2REF signal is used as trigger output.

  • “OC3REF”

    OC3REF signal is used as trigger output.

  • “OC4REF”

    OC4REF signal is used as trigger output.

Additional modes (on TRGO2 only):

  • “OC5REF”

    OC5REF signal is used as trigger output.

  • “OC6REF”

    OC6REF signal is used as trigger output.

  • “compare_pulse_OC4REF”:

    OC4REF rising or falling edges generate pulses.

  • “compare_pulse_OC6REF”:

    OC6REF rising or falling edges generate pulses.

  • “compare_pulse_OC4REF_r_or_OC6REF_r”:

    OC4REF or OC6REF rising edges generate pulses.

  • “compare_pulse_OC4REF_r_or_OC6REF_f”:

    OC4REF rising or OC6REF falling edges generate pulses.

  • “compare_pulse_OC5REF_r_or_OC6REF_r”:

    OC5REF or OC6REF rising edges generate pulses.

  • “compare_pulse_OC5REF_r_or_OC6REF_f”:

    OC5REF rising or OC6REF falling edges generate pulses.

+-----------+   +-------------+            +---------+
| Prescaler +-> | Counter     |        +-> | Master  | TRGO(2)
+-----------+   +--+--------+-+        |-> | Control +-->
                   |        |          ||  +---------+
                +--v--------+-+ OCxREF ||  +---------+
                | Chx compare +----------> | Output  | ChX
                +-----------+-+         |  | Control +-->
                      .     |           |  +---------+
                      .     |           |    .
                +-----------v-+ OC6REF  |    .
                | Ch6 compare +---------+>
                +-------------+

Example with: “compare_pulse_OC4REF_r_or_OC6REF_r”:

                X
              X   X
            X .   . X
          X   .   .   X
        X     .   .     X
count X .     .   .     . X
        .     .   .     .
        .     .   .     .
        +---------------+
OC4REF  |     .   .     |
      +-+     .   .     +-+
        .     +---+     .
OC6REF  .     |   |     .
      +-------+   +-------+
        +-+   +-+
TRGO2   | |   | |
      +-+ +---+ +---------+

/sys/bus/iio/devices/triggerX/name

Defined on file sysfs-bus-iio-trigger-sysfs

The name attribute holds a description string for the current trigger. In order to associate the trigger with an IIO device one should write this name string to /sys/bus/iio/devices/iio:deviceY/trigger/current_trigger.

/sys/bus/iio/devices/triggerX/name = "adxl372-devX-peak"

Defined on file sysfs-bus-iio-accel-adxl372

The adxl372 accelerometer kernel module provides an additional trigger, which sets the device in a mode in which it will record only the peak acceleration sensed over the set period of time in the events sysfs.

/sys/bus/iio/devices/triggerX/name = "bmc150_accel-any-motion-devX"

Defined on file sysfs-bus-iio-accel-bmc150

The BMC150 accelerometer kernel module provides an additional trigger, which sets driver in a mode, where data is pushed to the buffer only when there is any motion.

/sys/bus/iio/devices/triggerX/name = "bmg160-any-motion-devX"

Defined on file sysfs-bus-iio-gyro-bmg160

The BMG160 gyro kernel module provides an additional trigger, which sets driver in a mode, where data is pushed to the buffer only when there is any motion.

/sys/bus/iio/devices/triggerX/trigger_now

Defined on file sysfs-bus-iio-trigger-sysfs

This file is provided by the iio-trig-sysfs stand-alone trigger driver. Writing this file with any value triggers an event driven driver, associated with this trigger, to capture data into an in kernel buffer. This approach can be valuable during automated testing or in situations, where other trigger methods are not applicable. For example no RTC or spare GPIOs. X is the IIO index of the trigger.

/sys/bus/iio/devices/triggerX/trigger_polarity

Defined on file sysfs-bus-iio-adc-stm32

The STM32 ADC can be configured to use external trigger sources (e.g. timers, pwm or exti gpio). Then, it can be tuned to start conversions on external trigger by either:

  • “rising-edge”

  • “falling-edge”

  • “both-edges”.

Reading returns current trigger polarity.

Writing value before enabling conversions sets trigger polarity.

/sys/bus/iio/devices/triggerX/trigger_polarity_available

Defined on file sysfs-bus-iio-adc-stm32

List all available trigger_polarity settings.

/sys/bus/intel_th/devices/<intel_th_id>-<device><id>/active

Defined on file sysfs-bus-intel_th-output-devices

(RW) Writes of 1 or 0 enable or disable trace output to this output device. Reads return current status. Requires that the correstponding output port driver be loaded.

/sys/bus/intel_th/devices/<intel_th_id>-gth/masters/*

Defined on file sysfs-bus-intel_th-devices-gth

(RW) Configure output ports for STP masters. Writing -1 disables a master; any

/sys/bus/intel_th/devices/<intel_th_id>-gth/outputs/[0-7]_drop

Defined on file sysfs-bus-intel_th-devices-gth

(RW) Data retention policy setting: keep (0) or drop (1) incoming data while output port is in reset.

/sys/bus/intel_th/devices/<intel_th_id>-gth/outputs/[0-7]_flush

Defined on file sysfs-bus-intel_th-devices-gth

(RW) Force flush data from byte packing buffer for the output port.

/sys/bus/intel_th/devices/<intel_th_id>-gth/outputs/[0-7]_null

Defined on file sysfs-bus-intel_th-devices-gth

(RW) STP NULL packet generation: enabled (1) or disabled (0).

/sys/bus/intel_th/devices/<intel_th_id>-gth/outputs/[0-7]_port

Defined on file sysfs-bus-intel_th-devices-gth

(RO) Output port type:

0

not present,

1

MSU (Memory Storage Unit)

2

CTP (Common Trace Port)

4

PTI (MIPI PTI).

/sys/bus/intel_th/devices/<intel_th_id>-gth/outputs/[0-7]_reset

Defined on file sysfs-bus-intel_th-devices-gth

(RO) Output port is in reset (1).

/sys/bus/intel_th/devices/<intel_th_id>-gth/outputs/[0-7]_smcfreq

Defined on file sysfs-bus-intel_th-devices-gth

(RW) STP sync packet frequency for the port. Specifies the number of clocks between mainenance packets.

/sys/bus/intel_th/devices/<intel_th_id>-msc<msc-id>/mode

Defined on file sysfs-bus-intel_th-devices-msc

(RW) Configure MSC operating mode:

  • “single”, for contiguous buffer mode (high-order alloc);

  • “multi”, for multiblock mode;

  • “ExI”, for DCI handler mode;

  • “debug”, for debug mode;

  • any of the currently loaded buffer sinks.

If operating mode changes, existing buffer is deallocated, provided there are no active users and tracing is not enabled, otherwise the write will fail.

/sys/bus/intel_th/devices/<intel_th_id>-msc<msc-id>/nr_pages

Defined on file sysfs-bus-intel_th-devices-msc

(RW) Configure MSC buffer size for “single” or “multi” modes.

In single mode, this is a single number of pages, has to be power of 2. In multiblock mode, this is a comma-separated list of numbers of pages for each window to be allocated. Number of windows is not limited.

Writing to this file deallocates existing buffer (provided there are no active users and tracing is not enabled) and then allocates a new one.

/sys/bus/intel_th/devices/<intel_th_id>-msc<msc-id>/port

Defined on file sysfs-bus-intel_th-output-devices

(RO) Port number, corresponding to this output device on the switch (GTH) or “unassigned” if the corresponding output port driver is not loaded.

/sys/bus/intel_th/devices/<intel_th_id>-msc<msc-id>/stop_on_full

Defined on file sysfs-bus-intel_th-devices-msc

(RW) Configure whether trace stops when the last available window becomes full (1/y/Y) or wraps around and continues until the next window becomes available again (0/n/N).

/sys/bus/intel_th/devices/<intel_th_id>-msc<msc-id>/win_switch

Defined on file sysfs-bus-intel_th-devices-msc

(RW) Trigger window switch for the MSC’s buffer, in multi-window mode. In “multi” mode, accepts writes of “1”, thereby triggering a window switch for the buffer. Returns an error in any other operating mode or attempts to write something other than “1”.

/sys/bus/intel_th/devices/<intel_th_id>-msc<msc-id>/wrap

Defined on file sysfs-bus-intel_th-devices-msc

(RW) Configure MSC buffer wrapping. 1 == wrapping enabled.

/sys/bus/intel_th/devices/<intel_th_id>-pti/clock_divider

Defined on file sysfs-bus-intel_th-devices-pti

(RW) Configure PTI port clock divider:

  • 0: Intel TH clock rate,

  • 1: 1/2 Intel TH clock rate,

  • 2: 1/4 Intel TH clock rate,

  • 3: 1/8 Intel TH clock rate.

/sys/bus/intel_th/devices/<intel_th_id>-pti/freerunning_clock

Defined on file sysfs-bus-intel_th-devices-pti

(RW) 0: PTI trace clock acts as a strobe which only toggles when there is trace data to send. 1: PTI trace clock is a free-running clock.

/sys/bus/intel_th/devices/<intel_th_id>-pti/mode

Defined on file sysfs-bus-intel_th-devices-pti

(RW) Configure PTI output width. Currently supported values are 4, 8, 12, 16.

/sys/bus/mcb/devices/mcb:X

Defined on file sysfs-bus-mcb

Hardware chip or device hosting the MEN chameleon bus

/sys/bus/mcb/devices/mcb:X/minor

Defined on file sysfs-bus-mcb

The FPGA’s minor number

/sys/bus/mcb/devices/mcb:X/model

Defined on file sysfs-bus-mcb

The FPGA’s model number

/sys/bus/mcb/devices/mcb:X/name

Defined on file sysfs-bus-mcb

The FPGA’s name

/sys/bus/mcb/devices/mcb:X/revision

Defined on file sysfs-bus-mcb

The FPGA’s revision number

/sys/bus/mdio_bus/devices/.../statistics/errors_<addr>

/sys/class/mdio_bus/.../statistics/errors_<addr>

Defined on file sysfs-bus-mdio

Total number of transfer errors for this MDIO bus address.

/sys/bus/mdio_bus/devices/.../statistics/errors

/sys/class/mdio_bus/.../statistics/errors

Defined on file sysfs-bus-mdio

Total number of transfer errors for this MDIO bus.

/sys/bus/mdio_bus/devices/.../statistics/reads_<addr>

/sys/class/mdio_bus/.../statistics/reads_<addr>

Defined on file sysfs-bus-mdio

Total number of read transactions for this MDIO bus address.

/sys/bus/mdio_bus/devices/.../statistics/reads

/sys/class/mdio_bus/.../statistics/reads

Defined on file sysfs-bus-mdio

Total number of read transactions for this MDIO bus.

/sys/bus/mdio_bus/devices/.../statistics/transfers_<addr>

/sys/class/mdio_bus/.../statistics/transfers_<addr>

Defined on file sysfs-bus-mdio

Total number of transfers for this MDIO bus address.

/sys/bus/mdio_bus/devices/.../statistics/transfers

/sys/class/mdio_bus/.../transfers

Defined on file sysfs-bus-mdio

Total number of transfers for this MDIO bus.

/sys/bus/mdio_bus/devices/.../statistics/writes_<addr>

/sys/class/mdio_bus/.../statistics/writes_<addr>

Defined on file sysfs-bus-mdio

Total number of write transactions for this MDIO bus address.

/sys/bus/mdio_bus/devices/.../statistics/writes

/sys/class/mdio_bus/.../statistics/writes

Defined on file sysfs-bus-mdio

Total number of write transactions for this MDIO bus.

/sys/bus/mdio_bus/devices/.../statistics/

/sys/class/mdio_bus/.../statistics/

Defined on file sysfs-bus-mdio

This folder contains statistics about global and per MDIO bus address statistics.

/sys/bus/media/devices/.../model

Defined on file sysfs-bus-media

Contains the device model name in UTF-8. The device version is is not be appended to the model name.

/sys/bus/mei/devices/.../fixed

Defined on file sysfs-bus-mei

Stores mei client fixed address, if any Format: %d

/sys/bus/mei/devices/.../max_conn

Defined on file sysfs-bus-mei

Stores mei client maximum number of connections Format: %d

/sys/bus/mei/devices/.../max_len

Defined on file sysfs-bus-mei

Stores mei client maximum message length Format: %d

/sys/bus/mei/devices/.../modalias

Defined on file sysfs-bus-mei

Stores the same MODALIAS value emitted by uevent Format: mei:<mei device name>:<device uuid>:<protocol version>

/sys/bus/mei/devices/.../name

Defined on file sysfs-bus-mei

Stores mei client device name Format: string

/sys/bus/mei/devices/.../uuid

Defined on file sysfs-bus-mei

Stores mei client device uuid Format: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx

/sys/bus/mei/devices/.../version

Defined on file sysfs-bus-mei

Stores mei client protocol version Format: %d

/sys/bus/mei/devices/.../vtag

Defined on file sysfs-bus-mei

Stores mei client vtag support status Format: %d

/sys/bus/mmc/devices/.../rev

Defined on file sysfs-bus-mmc

Extended CSD revision number

/sys/bus/most/devices/<dev>/<channel>/

Defined on file sysfs-bus-most

For every channel of the device a directory is created, whose name is dictated by the HDM. This enables an application to collect information about the channel’s capabilities and configure it.

/sys/bus/most/devices/<dev>/<channel>/available_datatypes

Defined on file sysfs-bus-most

Indicates the data types the channel can transport.

/sys/bus/most/devices/<dev>/<channel>/available_directions

Defined on file sysfs-bus-most

Indicates the directions the channel is capable of.

/sys/bus/most/devices/<dev>/<channel>/channel_starving

Defined on file sysfs-bus-most

Indicates whether channel ran out of buffers.

/sys/bus/most/devices/<dev>/<channel>/number_of_packet_buffers

Defined on file sysfs-bus-most

Indicates the number of packet buffers the channel can handle.

/sys/bus/most/devices/<dev>/<channel>/number_of_stream_buffers

Defined on file sysfs-bus-most

Indicates the number of streaming buffers the channel can handle.

/sys/bus/most/devices/<dev>/<channel>/set_buffer_size

Defined on file sysfs-bus-most

This is to read back the configured buffer size of the channel.

/sys/bus/most/devices/<dev>/<channel>/set_datatype

Defined on file sysfs-bus-most

This is to read back the configured data type of the channel. The following strings will be accepted:

'control',
'async',
'sync',
'isoc_avp'

/sys/bus/most/devices/<dev>/<channel>/set_direction

Defined on file sysfs-bus-most

This is to read back the configured direction of the channel. The following strings will be accepted:

'tx',
'rx'

/sys/bus/most/devices/<dev>/<channel>/set_number_of_buffers

Defined on file sysfs-bus-most

This is to read back the configured number of buffers of the channel.

/sys/bus/most/devices/<dev>/<channel>/set_packets_per_xact

Defined on file sysfs-bus-most

This is to read back the configured number of packets per transaction of the channel. This is only applicable when connected via USB.

/sys/bus/most/devices/<dev>/<channel>/set_subbuffer_size

Defined on file sysfs-bus-most

This is to read back the configured subbuffer size of the channel.

/sys/bus/most/devices/<dev>/<channel>/size_of_packet_buffer

Defined on file sysfs-bus-most

Indicates the size of a packet buffer the channel can handle.

/sys/bus/most/devices/<dev>/<channel>/size_of_stream_buffer

Defined on file sysfs-bus-most

Indicates the size of a streaming buffer the channel can handle.

/sys/bus/most/devices/<dev>/dci

Defined on file sysfs-bus-most

If the network interface controller is attached via USB, a dci directory is created that allows applications to read and write the controller’s DCI registers.

/sys/bus/most/devices/<dev>/dci/arb_address

Defined on file sysfs-bus-most

This is used to set an arbitrary DCI register address an application wants to read from or write to.

/sys/bus/most/devices/<dev>/dci/arb_value

Defined on file sysfs-bus-most

This is used to read and write the DCI register whose address is stored in arb_address.

/sys/bus/most/devices/<dev>/dci/mep_eui48_hi

Defined on file sysfs-bus-most

This is used to check and configure the MAC address.

/sys/bus/most/devices/<dev>/dci/mep_eui48_lo

Defined on file sysfs-bus-most

This is used to check and configure the MAC address.

/sys/bus/most/devices/<dev>/dci/mep_eui48_mi

Defined on file sysfs-bus-most

This is used to check and configure the MAC address.

/sys/bus/most/devices/<dev>/dci/mep_filter

Defined on file sysfs-bus-most

This is used to check and configure the MEP filter address.

/sys/bus/most/devices/<dev>/dci/mep_hash0

Defined on file sysfs-bus-most

This is used to check and configure the MEP hash table.

/sys/bus/most/devices/<dev>/dci/mep_hash1

Defined on file sysfs-bus-most

This is used to check and configure the MEP hash table.

/sys/bus/most/devices/<dev>/dci/mep_hash2

Defined on file sysfs-bus-most

This is used to check and configure the MEP hash table.

/sys/bus/most/devices/<dev>/dci/mep_hash3

Defined on file sysfs-bus-most

This is used to check and configure the MEP hash table.

/sys/bus/most/devices/<dev>/dci/ni_state

Defined on file sysfs-bus-most

Indicates the current network interface state.

/sys/bus/most/devices/<dev>/dci/node_address

Defined on file sysfs-bus-most

Indicates the current node address.

/sys/bus/most/devices/<dev>/dci/node_position

Defined on file sysfs-bus-most

Indicates the current node position.

/sys/bus/most/devices/<dev>/dci/packet_bandwidth

Defined on file sysfs-bus-most

Indicates the configured packet bandwidth.

/sys/bus/most/devices/<dev>/dci/sync_ep

Defined on file sysfs-bus-most

Triggers the controller’s synchronization process for a certain endpoint.

/sys/bus/most/devices/<dev>/description

Defined on file sysfs-bus-most

Provides information about the physical location of the device. Hardware attached via USB, for instance, might return <1-1.1:1.0>

/sys/bus/most/devices/<dev>/interface

Defined on file sysfs-bus-most

Indicates the type of peripheral interface the device uses.

/sys/bus/most/drivers/most_core/components

Defined on file sysfs-bus-most

This is used to retrieve a list of registered components.

Defined on file sysfs-bus-most

This is used to retrieve a list of established links.

/sys/bus/moxtet/devices/moxtet-<name>.<addr>/module_description

Defined on file sysfs-bus-moxtet-devices

(Read) Moxtet module description. Format: string

/sys/bus/moxtet/devices/moxtet-<name>.<addr>/module_id

Defined on file sysfs-bus-moxtet-devices

(Read) Moxtet module ID. Format: %x

/sys/bus/moxtet/devices/moxtet-<name>.<addr>/module_name

Defined on file sysfs-bus-moxtet-devices

(Read) Moxtet module name. Format: string

/sys/bus/nd/devices/ndbusX/nfit/dsm_mask

Defined on file sysfs-bus-nfit

(RO) The bitmask indicates the supported bus specific control functions. See the section named ‘NVDIMM Root Device _DSMs’ in the ACPI specification.

/sys/bus/nd/devices/ndbusX/nfit/firmware_activate_noidle

Defined on file sysfs-bus-nfit

(RW) The Intel platform implementation of firmware activate support exposes an option let the platform force idle devices in the system over the activation event, or trust that the OS will do it. The safe default is to let the platform force idle devices since the kernel is already in a suspend state, and on the chance that a driver does not properly quiesce bus-mastering after a suspend callback the platform will handle it. However, the activation might abort if, for example, platform firmware determines that the activation time exceeds the max PCI-E completion timeout. Since the platform does not know whether the OS is running the activation from a suspend context it aborts, but if the system owner trusts driver suspend callback to be sufficient then ‘firmware_activation_noidle’ can be enabled to bypass the activation abort.

/sys/bus/nd/devices/ndbusX/nfit/hw_error_scrub

Defined on file sysfs-bus-nfit

(RW) Provides a way to toggle the behavior between just adding the address (cache line) where the MCE happened to the poison list and doing a full scrub. The former (selective insertion of the address) is done unconditionally.

This attribute can have the following values written to it:

‘0’: Switch to the default mode where an exception will only insert the address of the memory error into the poison and badblocks lists. ‘1’: Enable a full scrub to happen if an exception for a memory error is received.

/sys/bus/nd/devices/ndbusX/nfit/revision

Defined on file sysfs-bus-nfit

(RO) ACPI NFIT table revision number.

/sys/bus/nd/devices/ndbusX/nfit/scrub

Defined on file sysfs-bus-nfit

(RW) This shows the number of full Address Range Scrubs (ARS) that have been completed since driver load time. Userspace can wait on this using select/poll etc. A ‘+’ at the end indicates an ARS is in progress

Writing a value of 1 triggers an ARS scan.

/sys/bus/nd/devices/nmemX/cxl/id

Defined on file sysfs-bus-nvdimm

(RO) Show the id (serial) of the device. This is CXL specific.

/sys/bus/nd/devices/nmemX/cxl/provider

Defined on file sysfs-bus-nvdimm

(RO) Shows the CXL bridge device that ties to a CXL memory device to this NVDIMM device. I.e. the parent of the device returned is a /sys/bus/cxl/devices/memX instance.

/sys/bus/nd/devices/nmemX/nfit/device

Defined on file sysfs-bus-nfit

(RO) Device id for the NVDIMM, assigned by the module vendor.

/sys/bus/nd/devices/nmemX/nfit/dsm_mask

Defined on file sysfs-bus-nfit

(RO) The bitmask indicates the supported device specific control functions relative to the NVDIMM command family supported by the device

/sys/bus/nd/devices/nmemX/nfit/family

Defined on file sysfs-bus-nfit

(RO) Displays the NVDIMM family command sets. Values 0, 1, 2 and 3 correspond to NVDIMM_FAMILY_INTEL, NVDIMM_FAMILY_HPE1, NVDIMM_FAMILY_HPE2 and NVDIMM_FAMILY_MSFT respectively.

See the specifications for these command families here: http://pmem.io/documents/NVDIMM_DSM_Interface-V1.6.pdf https://github.com/HewlettPackard/hpe-nvm/blob/master/Documentation/ https://msdn.microsoft.com/library/windows/hardware/mt604741”

/sys/bus/nd/devices/nmemX/nfit/flags

Defined on file sysfs-bus-nfit

(RO) The flags in the NFIT memory device sub-structure indicate the state of the data on the nvdimm relative to its energy source or last “flush to persistence”.

The attribute is a translation of the ‘NVDIMM State Flags’ field in section 5.2.25.3 ‘NVDIMM Region Mapping’ Structure of the ACPI specification 6.2.

The health states are “save_fail”, “restore_fail”, “flush_fail”, “not_armed”, “smart_event”, “map_fail” and “smart_notify”.

/sys/bus/nd/devices/nmemX/nfit/format

/sys/bus/nd/devices/nmemX/nfit/format1

/sys/bus/nd/devices/nmemX/nfit/formats

Defined on file sysfs-bus-nfit

(RO) The interface codes indicate support for persistent memory mapped directly into system physical address space and / or a block aperture access mechanism to the NVDIMM media. The ‘formats’ attribute displays the number of supported interfaces.

This layout is compatible with existing libndctl binaries that only expect one code per-dimm as they will ignore nmemX/nfit/formats and nmemX/nfit/formatN.

/sys/bus/nd/devices/nmemX/nfit/handle

Defined on file sysfs-bus-nfit

(RO) The address (given by the _ADR object) of the device on its parent bus of the NVDIMM device containing the NVDIMM region.

/sys/bus/nd/devices/nmemX/nfit/id

Defined on file sysfs-bus-nfit

(RO) ACPI specification 6.2 section 5.2.25.9, defines an identifier for an NVDIMM, which reflects the id attribute.

/sys/bus/nd/devices/nmemX/nfit/phys_id

Defined on file sysfs-bus-nfit

(RO) Handle (i.e., instance number) for the SMBIOS (system management BIOS) Memory Device structure describing the NVDIMM containing the NVDIMM region.

/sys/bus/nd/devices/nmemX/nfit/rev_id

Defined on file sysfs-bus-nfit

(RO) Revision of the NVDIMM, assigned by the module vendor.

/sys/bus/nd/devices/nmemX/nfit/serial

Defined on file sysfs-bus-nfit

(RO) Serial number of the NVDIMM (non-volatile dual in-line memory module), assigned by the module vendor.

/sys/bus/nd/devices/nmemX/nfit/subsystem_device

Defined on file sysfs-bus-nfit

(RO) Sub-system device id for the NVDIMM non-volatile memory subsystem controller, assigned by the non-volatile memory subsystem controller vendor.

/sys/bus/nd/devices/nmemX/nfit/subsystem_rev_id

Defined on file sysfs-bus-nfit

(RO) Sub-system revision id of the NVDIMM non-volatile memory subsystem controller, assigned by the non-volatile memory subsystem controller vendor.

/sys/bus/nd/devices/nmemX/nfit/subsystem_vendor

Defined on file sysfs-bus-nfit

(RO) Sub-system vendor id of the NVDIMM non-volatile memory subsystem controller.

/sys/bus/nd/devices/nmemX/nfit/vendor

Defined on file sysfs-bus-nfit

(RO) Vendor id of the NVDIMM.

/sys/bus/nd/devices/nmemX/papr/flags

Defined on file sysfs-bus-papr-pmem

(RO) Report flags indicating various states of a papr-pmem NVDIMM device. Each flag maps to a one or more bits set in the dimm-health-bitmap retrieved in response to H_SCM_HEALTH hcall. The details of the bit flags returned in response to this hcall is available at ‘Hypercall Op-codes (hcalls)’ . Below are the flags reported in this sysfs file:

  • “not_armed”

    Indicates that NVDIMM contents will not survive a power cycle.

  • “flush_fail”

    Indicates that NVDIMM contents couldn’t be flushed during last shut-down event.

  • “restore_fail”

    Indicates that NVDIMM contents couldn’t be restored during NVDIMM initialization.

  • “encrypted”

    NVDIMM contents are encrypted.

  • “smart_notify”

    There is health event for the NVDIMM.

  • “scrubbed”

    Indicating that contents of the NVDIMM have been scrubbed.

  • “locked”

    Indicating that NVDIMM contents can’t be modified until next power cycle.

/sys/bus/nd/devices/nmemX/papr/health_bitmap_inject

Defined on file sysfs-bus-papr-pmem

(RO) Reports the health bitmap inject bitmap that is applied to bitmap received from PowerVM via the H_SCM_HEALTH. This is used to forcibly set specific bits returned from Hcall. These is then used to simulate various health or shutdown states for an nvdimm and are set by user-space tools like ndctl by issuing a PAPR DSM.

/sys/bus/nd/devices/nmemX/papr/perf_stats

Defined on file sysfs-bus-papr-pmem

(RO) Report various performance stats related to papr-scm NVDIMM device. This attribute is only available for NVDIMM devices that support reporting NVDIMM performance stats. Each stat is reported on a new line with each line composed of a stat-identifier followed by it value. Below are currently known dimm performance stats which are reported:

  • “CtlResCt” : Controller Reset Count

  • “CtlResTm” : Controller Reset Elapsed Time

  • “PonSecs “ : Power-on Seconds

  • “MemLife “ : Life Remaining

  • “CritRscU” : Critical Resource Utilization

  • “HostLCnt” : Host Load Count

  • “HostSCnt” : Host Store Count

  • “HostSDur” : Host Store Duration

  • “HostLDur” : Host Load Duration

  • “MedRCnt “ : Media Read Count

  • “MedWCnt “ : Media Write Count

  • “MedRDur “ : Media Read Duration

  • “MedWDur “ : Media Write Duration

  • “CchRHCnt” : Cache Read Hit Count

  • “CchWHCnt” : Cache Write Hit Count

  • “FastWCnt” : Fast Write Count

/sys/bus/nd/devices/regionX/nfit/range_index

Defined on file sysfs-bus-nfit

(RO) A unique number provided by the BIOS to identify an address range. Used by NVDIMM Region Mapping Structure to uniquely refer to this structure. Value of 0 is reserved and not used as an index.

/sys/bus/nvmem/devices/.../cells/<cell-name>

Defined on file sysfs-nvmem-cells

The “cells” folder contains one file per cell exposed by the NVMEM device. The name of the file is: “<name>@<byte>,<bit>”, with <name> being the cell name and <where> its location in the NVMEM device, in hexadecimal bytes and bits (without the ‘0x’ prefix, to mimic device tree node names). The length of the file is the size of the cell (when known). The content of the file is the binary content of the cell (may sometimes be ASCII, likely without trailing character). Note: This file is only present if CONFIG_NVMEM_SYSFS is enabled.

Example:

hexdump -C /sys/bus/nvmem/devices/1-00563/cells/product-name@d,0
00000000  54 4e 34 38 4d 2d 50 2d  44 4e         |TN48M-P-DN|
0000000a

/sys/bus/pci/devices/.../acpi_index

Defined on file sysfs-bus-pci

Reading this attribute will provide the firmware given instance (ACPI _DSM instance number) of the PCI device. The attribute will be created only if the firmware has given an instance number to the PCI device. ACPI _DSM instance number will be given priority if the system firmware provides SMBIOS type 41 device type instance also.

Users:

Userspace applications interested in knowing the firmware assigned instance number of the PCI device that can help in understanding the firmware intended order of the PCI device.

/sys/bus/pci/devices/.../d3cold_allowed

Defined on file sysfs-bus-pci

d3cold_allowed is bit to control whether the corresponding PCI device can be put into D3Cold state. If it is cleared, the device will never be put into D3Cold state. If it is set, the device may be put into D3Cold state if other requirements are satisfied too. Reading this attribute will show the current value of d3cold_allowed bit. Writing this attribute will set the value of d3cold_allowed bit.

Defined on file sysfs-bus-pci

This symbolic link appears when hardware supports the SR-IOV capability and the Physical Function driver has enabled it, and this device has vendor specific dependencies with others. The symbolic link points to the PCI device sysfs entry of Physical Function this device depends on.

/sys/bus/pci/devices/.../driver_override

Defined on file sysfs-bus-pci

This file allows the driver for a device to be specified which will override standard static and dynamic ID matching. When specified, only a driver with a name matching the value written to driver_override will have an opportunity to bind to the device. The override is specified by writing a string to the driver_override file (echo pci-stub > driver_override) and may be cleared with an empty string (echo > driver_override). This returns the device to standard matching rules binding. Writing to driver_override does not automatically unbind the device from its current driver or make any attempt to automatically load the specified driver. If no driver with a matching name is currently loaded in the kernel, the device will not bind to any driver. This also allows devices to opt-out of driver binding using a driver_override name such as “none”. Only a single driver may be specified in the override, there is no support for parsing delimiters.

/sys/bus/pci/devices/.../index

Defined on file sysfs-bus-pci

Reading this attribute will provide the firmware given instance number of the PCI device. Depending on the platform this can be for example the SMBIOS type 41 device type instance or the user-defined ID (UID) on s390. The attribute will be created only if the firmware has given an instance number to the PCI device and that number is guaranteed to uniquely identify the device in the system.

Users:

Userspace applications interested in knowing the firmware assigned device type instance of the PCI device that can help in understanding the firmware intended order of the PCI device.

/sys/bus/pci/devices/.../irq

Defined on file sysfs-bus-pci

If a driver has enabled MSI (not MSI-X), “irq” contains the IRQ of the first MSI vector. Otherwise “irq” contains the IRQ of the legacy INTx interrupt.

“irq” being set to 0 indicates that the device isn’t capable of generating legacy INTx interrupts.

/sys/bus/pci/devices/.../label

Defined on file sysfs-bus-pci

Reading this attribute will provide the firmware given name (SMBIOS type 41 string or ACPI _DSM string) of the PCI device. The attribute will be created only if the firmware has given a name to the PCI device. ACPI _DSM string name will be given priority if the system firmware provides SMBIOS type 41 string also.

Users:

Userspace applications interested in knowing the firmware assigned name of the PCI device.

Defined on file sysfs-bus-pci

If ASPM is supported for an endpoint, these files can be used to disable or enable the individual power management states. Write y/1/on to enable, n/0/off to disable.

/sys/bus/pci/devices/.../modalias

Defined on file sysfs-bus-pci

This attribute indicates the PCI ID of the device object.

That is in the format: pci:vXXXXXXXXdXXXXXXXXsvXXXXXXXXsdXXXXXXXXbcXXscXXiXX, where:

  • vXXXXXXXX contains the vendor ID;

  • dXXXXXXXX contains the device ID;

  • svXXXXXXXX contains the sub-vendor ID;

  • sdXXXXXXXX contains the subsystem device ID;

  • bcXX contains the device class;

  • scXX contains the device subclass;

  • iXX contains the device class programming interface.

/sys/bus/pci/devices/.../msi_bus

Defined on file sysfs-bus-pci

Writing a zero value to this attribute disallows MSI and MSI-X for any future drivers of the device. If the device is a bridge, MSI and MSI-X will be disallowed for future drivers of all child devices under the bridge. Drivers must be reloaded for the new setting to take effect.

/sys/bus/pci/devices/.../msi_irqs/

Defined on file sysfs-bus-pci

The /sys/devices/.../msi_irqs directory contains a variable set of files, with each file being named after a corresponding msi irq vector allocated to that device.

/sys/bus/pci/devices/.../msi_irqs/<N>

Defined on file sysfs-bus-pci

This attribute indicates the mode that the irq vector named by the file is in (msi vs. msix)

/sys/bus/pci/devices/.../numa_node

Defined on file sysfs-bus-pci

This file contains the NUMA node to which the PCI device is attached, or -1 if the node is unknown. The initial value comes from an ACPI _PXM method or a similar firmware source. If that is missing or incorrect, this file can be written to override the node. In that case, please report a firmware bug to the system vendor. Writing to this file taints the kernel with TAINT_FIRMWARE_WORKAROUND, which reduces the supportability of your system.

/sys/bus/pci/devices/.../p2pmem/allocate

Defined on file sysfs-bus-pci

This file allows mapping p2pmem into userspace. For each mmap() call on this file, the kernel will allocate a chunk of Peer-to-Peer memory for use in Peer-to-Peer transactions. This memory can be used in O_DIRECT calls to NVMe backed files for Peer-to-Peer copies.

/sys/bus/pci/devices/.../p2pmem/available

Defined on file sysfs-bus-pci

If the device has any Peer-to-Peer memory registered, this file contains the amount of memory that has not been allocated (in decimal).

/sys/bus/pci/devices/.../p2pmem/published

Defined on file sysfs-bus-pci

If the device has any Peer-to-Peer memory registered, this file contains a ‘1’ if the memory has been published for use outside the driver that owns the device.

/sys/bus/pci/devices/.../p2pmem/size

Defined on file sysfs-bus-pci

If the device has any Peer-to-Peer memory registered, this file contains the total amount of memory that the device provides (in decimal).

/sys/bus/pci/devices/.../pci_bus/.../rescan

Defined on file sysfs-bus-pci

Writing a non-zero value to this attribute will force a rescan of the bus and all child buses, and re-discover devices removed earlier from this part of the device tree.

/sys/bus/pci/devices/.../physfn

Defined on file sysfs-bus-pci

This symbolic link appears when a device is a Virtual Function. The symbolic link points to the PCI device sysfs entry of the Physical Function this device associates with.

/sys/bus/pci/devices/.../power_state

Defined on file sysfs-bus-pci

This file contains the current PCI power state of the device. The value comes from the PCI kernel device state and can be one of: “unknown”, “error”, “D0”, D1”, “D2”, “D3hot”, “D3cold”. The file is read only.

/sys/bus/pci/devices/.../remove

Defined on file sysfs-bus-pci

Writing a non-zero value to this attribute will hot-remove the PCI device and any of its children.

/sys/bus/pci/devices/.../rescan

Defined on file sysfs-bus-pci

Writing a non-zero value to this attribute will force a rescan of the device’s parent bus and all child buses, and re-discover devices removed earlier from this part of the device tree.

/sys/bus/pci/devices/.../reset

Defined on file sysfs-bus-pci

Some devices allow an individual function to be reset without affecting other functions in the same device. For devices that have this support, a file named reset will be present in sysfs. Writing 1 to this file will perform reset.

/sys/bus/pci/devices/.../reset_method

Defined on file sysfs-bus-pci

Some devices allow an individual function to be reset without affecting other functions in the same slot.

For devices that have this support, a file named reset_method is present in sysfs. Reading this file gives names of the supported and enabled reset methods and their ordering. Writing a space-separated list of names of reset methods sets the reset methods and ordering to be used when resetting the device. Writing an empty string disables the ability to reset the device. Writing “default” enables all supported reset methods in the default ordering.

/sys/bus/pci/devices/.../resourceN_resize

Defined on file sysfs-bus-pci

These files provide an interface to PCIe Resizable BAR support. A file is created for each BAR resource (N) supported by the PCIe Resizable BAR extended capability of the device. Reading each file exposes the bitmap of available resource sizes:

# cat resource1_resize 00000000000001c0

The bitmap represents supported resource sizes for the BAR, where bit0 = 1MB, bit1 = 2MB, bit2 = 4MB, etc. In the above example the device supports 64MB, 128MB, and 256MB BAR sizes.

When writing the file, the user provides the bit position of the desired resource size, for example:

# echo 7 > resource1_resize

This indicates to set the size value corresponding to bit 7, 128MB. The resulting size is 2 ^ (bit# + 20). This definition matches the PCIe specification of this capability.

In order to make use of resource resizing, all PCI drivers must be unbound from the device and peer devices under the same parent bridge may need to be soft removed. In the case of VGA devices, writing a resize value will remove low level console drivers from the device. Raw users of pci-sysfs resourceN attributes must be terminated prior to resizing. Success of the resizing operation is not guaranteed.

/sys/bus/pci/devices/.../revision

Defined on file sysfs-bus-pci

This file contains the revision field of the PCI device. The value comes from device config space. The file is read only.

/sys/bus/pci/devices/.../sriov_drivers_autoprobe

Defined on file sysfs-bus-pci

This file is associated with the PF of a device that supports SR-IOV. It determines whether newly-enabled VFs are immediately bound to a driver. It initially contains 1, which means the kernel automatically binds VFs to a compatible driver immediately after they are enabled. If an application writes 0 to the file before enabling VFs, the kernel will not bind VFs to a driver.

A typical use case is to write 0 to this file, then enable VFs, then assign the newly-created VFs to virtual machines. Note that changing this file does not affect already- enabled VFs. In this scenario, the user must first disable the VFs, write 0 to sriov_drivers_autoprobe, then re-enable the VFs.

This is similar to /sys/bus/pci/drivers_autoprobe, but affects only the VFs associated with a specific PF.

/sys/bus/pci/devices/.../sriov_numvfs

Defined on file sysfs-bus-pci

This file appears when a physical PCIe device supports SR-IOV. Userspace applications can read and write to this file to determine and control the enablement or disablement of Virtual Functions (VFs) on the physical function (PF). A read of this file will return the number of VFs that are enabled on this PF. A number written to this file will enable the specified number of VFs. A userspace application would typically read the file and check that the value is zero, and then write the number of VFs that should be enabled on the PF; the value written should be less than or equal to the value in the sriov_totalvfs file. A userspace application wanting to disable the VFs would write a zero to this file. The core ensures that valid values are written to this file, and returns errors when values are not valid. For example, writing a 2 to this file when sriov_numvfs is not 0 and not 2 already will return an error. Writing a 10 when the value of sriov_totalvfs is 8 will return an error.

/sys/bus/pci/devices/.../sriov_totalvfs

Defined on file sysfs-bus-pci

This file appears when a physical PCIe device supports SR-IOV. Userspace applications can read this file to determine the maximum number of Virtual Functions (VFs) a PCIe physical function (PF) can support. Typically, this is the value reported in the PF’s SR-IOV extended capability structure’s TotalVFs element. Drivers have the ability at probe time to reduce the value read from this file via the pci_sriov_set_totalvfs() function.

/sys/bus/pci/devices/.../sriov_vf_msix_count

Defined on file sysfs-bus-pci

This file is associated with a SR-IOV virtual function (VF). It allows configuration of the number of MSI-X vectors for the VF. This allows devices that have a global pool of MSI-X vectors to optimally divide them between VFs based on VF usage.

The values accepted are:
  • > 0 - this number will be reported as the Table Size in the

    VF’s MSI-X capability

  • < 0 - not valid

  • = 0 - will reset to the device default value

The file is writable if the PF is bound to a driver that implements ->sriov_set_msix_vec_count().

/sys/bus/pci/devices/.../sriov_vf_total_msix

Defined on file sysfs-bus-pci

This file is associated with a SR-IOV physical function (PF). It contains the total number of MSI-X vectors available for assignment to all virtual functions (VFs) associated with PF. The value will be zero if the device doesn’t support this functionality. For supported devices, the value will be constant and won’t be changed after MSI-X vectors assignment.

/sys/bus/pci/devices/.../virtfn<N>

Defined on file sysfs-bus-pci

This symbolic link appears when hardware supports the SR-IOV capability and the Physical Function driver has enabled it. The symbolic link points to the PCI device sysfs entry of the Virtual Function whose index is N (0...MaxVFs-1).

/sys/bus/pci/devices/.../vpd

Defined on file sysfs-bus-pci

A file named vpd in a device directory will be a binary file containing the Vital Product Data for the device. It should follow the VPD format defined in PCI Specification 2.1 or 2.2, but users should consider that some devices may have incorrectly formatted data. If the underlying VPD has a writable section then the corresponding section of this file will be writable.

/sys/bus/pci/devices/<BDF>/anti_rollback_status

Defined on file sysfs-driver-ccp

The /sys/bus/pci/devices/<BDF>/anti_rollback_status file reports whether the PSP is enforcing rollback protection. Possible values: 0: Not enforcing 1: Enforcing

/sys/bus/pci/devices/<BDF>/bootloader_version

Defined on file sysfs-driver-ccp

The /sys/bus/pci/devices/<BDF>/bootloader_version file reports the firmware version of the AMD AGESA bootloader.

/sys/bus/pci/devices/<BDF>/debug_lock_on

Defined on file sysfs-driver-ccp

The /sys/bus/pci/devices/<BDF>/debug_lock_on reports whether the AMD CPU or APU has been unlocked for debugging. Possible values: 0: Not locked 1: Locked

/sys/bus/pci/devices/<BDF>/fused_part

Defined on file sysfs-driver-ccp

The /sys/bus/pci/devices/<BDF>/fused_part file reports whether the CPU or APU has been fused to prevent tampering. 0: Not fused 1: Fused

/sys/bus/pci/devices/<BDF>/hsp_tpm_available

Defined on file sysfs-driver-ccp

The /sys/bus/pci/devices/<BDF>/hsp_tpm_available file reports whether the HSP TPM has been activated. Possible values: 0: Not activated or present 1: Activated

/sys/bus/pci/devices/<BDF>/qat/auto_reset

Defined on file sysfs-driver-qat

(RW) Reports the current state of the autoreset feature for a QAT device

Write to the attribute to enable or disable device auto reset.

Device auto reset is disabled by default.

The values are:

  • 1/Yy/on: auto reset enabled. If the device encounters an unrecoverable error, it will be reset automatically.

  • 0/Nn/off: auto reset disabled. If the device encounters an unrecoverable error, it will not be reset.

This attribute is only available for qat_4xxx devices.

/sys/bus/pci/devices/<BDF>/qat/cfg_services

Defined on file sysfs-driver-qat

(RW) Reports the current configuration of the QAT device. Write to the file to change the configured services.

The values are:

  • sym;asym: the device is configured for running crypto services

  • asym;sym: identical to sym;asym

  • dc: the device is configured for running compression services

  • dcc: identical to dc but enables the dc chaining feature, hash then compression. If this is not required chose dc

  • sym: the device is configured for running symmetric crypto services

  • asym: the device is configured for running asymmetric crypto services

  • asym;dc: the device is configured for running asymmetric crypto services and compression services

  • dc;asym: identical to asym;dc

  • sym;dc: the device is configured for running symmetric crypto services and compression services

  • dc;sym: identical to sym;dc

It is possible to set the configuration only if the device is in the down state (see /sys/bus/pci/devices/<BDF>/qat/state)

The following example shows how to change the configuration of a device configured for running crypto services in order to run data compression:

# cat /sys/bus/pci/devices/<BDF>/qat/state
up
# cat /sys/bus/pci/devices/<BDF>/qat/cfg_services
sym;asym
# echo down > /sys/bus/pci/devices/<BDF>/qat/state
# echo dc > /sys/bus/pci/devices/<BDF>/qat/cfg_services
# echo up > /sys/bus/pci/devices/<BDF>/qat/state
# cat /sys/bus/pci/devices/<BDF>/qat/cfg_services
dc

This attribute is only available for qat_4xxx devices.

/sys/bus/pci/devices/<BDF>/qat/num_rps

Defined on file sysfs-driver-qat

(RO) Returns the number of ring pairs that a single device has.

Example usage:

# cat /sys/bus/pci/devices/<BDF>/qat/num_rps
64

This attribute is only available for qat_4xxx devices.

/sys/bus/pci/devices/<BDF>/qat/pm_idle_enabled

Defined on file sysfs-driver-qat

(RW) This configuration option provides a way to force the device into remaining in the MAX power state. If idle support is enabled the device will transition to the MIN power state when idle, otherwise will stay in the MAX power state. Write to the file to enable or disable idle support.

The values are:

  • 0: idle support is disabled

  • 1: idle support is enabled

Default value is 1.

It is possible to set the pm_idle_enabled value only if the device is in the down state (see /sys/bus/pci/devices/<BDF>/qat/state)

The following example shows how to change the pm_idle_enabled of a device:

# cat /sys/bus/pci/devices/<BDF>/qat/state
up
# cat /sys/bus/pci/devices/<BDF>/qat/pm_idle_enabled
1
# echo down > /sys/bus/pci/devices/<BDF>/qat/state
# echo 0 > /sys/bus/pci/devices/<BDF>/qat/pm_idle_enabled
# echo up > /sys/bus/pci/devices/<BDF>/qat/state
# cat /sys/bus/pci/devices/<BDF>/qat/pm_idle_enabled
0

This attribute is only available for qat_4xxx devices.

/sys/bus/pci/devices/<BDF>/qat/rp2srv

Defined on file sysfs-driver-qat

(RW) This attribute provides a way for a user to query a specific ring pair for the type of service that it is currently configured for.

When written to, the value is cached and used to perform the read operation. Allowed values are in the range 0 to N-1, where N is the max number of ring pairs supported by a device. This can be queried using the attribute qat/num_rps.

A read returns the service associated to the ring pair queried.

The values are:

  • dc: the ring pair is configured for running compression services

  • sym: the ring pair is configured for running symmetric crypto services

  • asym: the ring pair is configured for running asymmetric crypto services

Example usage:

# echo 1 > /sys/bus/pci/devices/<BDF>/qat/rp2srv
# cat /sys/bus/pci/devices/<BDF>/qat/rp2srv
sym

This attribute is only available for qat_4xxx devices.

/sys/bus/pci/devices/<BDF>/qat/state

Defined on file sysfs-driver-qat

(RW) Reports the current state of the QAT device. Write to the file to start or stop the device.

The values are:

  • up: the device is up and running

  • down: the device is down

It is possible to transition the device from up to down only if the device is up and vice versa.

This attribute is only available for qat_4xxx devices.

/sys/bus/pci/devices/<BDF>/qat_ras/errors_correctable

Defined on file sysfs-driver-qat_ras

(RO) Reports the number of correctable errors detected by the device.

This attribute is only available for qat_4xxx devices.

/sys/bus/pci/devices/<BDF>/qat_ras/errors_fatal

Defined on file sysfs-driver-qat_ras

(RO) Reports the number of fatal errors detected by the device.

This attribute is only available for qat_4xxx devices.

/sys/bus/pci/devices/<BDF>/qat_ras/errors_nonfatal

Defined on file sysfs-driver-qat_ras

(RO) Reports the number of non fatal errors detected by the device.

This attribute is only available for qat_4xxx devices.

/sys/bus/pci/devices/<BDF>/qat_ras/reset_error_counters

Defined on file sysfs-driver-qat_ras

(WO) Write to resets all error counters of a device.

The following example reports how to reset the counters:

# echo 1 > /sys/bus/pci/devices/<BDF>/qat_ras/reset_error_counters
# cat /sys/bus/pci/devices/<BDF>/qat_ras/errors_correctable
0
# cat /sys/bus/pci/devices/<BDF>/qat_ras/errors_nonfatal
0
# cat /sys/bus/pci/devices/<BDF>/qat_ras/errors_fatal
0

This attribute is only available for qat_4xxx devices.

/sys/bus/pci/devices/<BDF>/qat_rl/cap_rem

Defined on file sysfs-driver-qat_rl

(RW) This file will return the remaining capability for a particular service/sla. This is the remaining value that a new SLA can be set to or a current SLA can be increased with.

Example usage:

# echo "asym" > /sys/bus/pci/devices/<BDF>/qat_rl/cap_rem
# cat /sys/bus/pci/devices/<BDF>/qat_rl/cap_rem
250
# echo 250 > /sys/bus/pci/devices/<BDF>/qat_rl/cir
# echo "add" > /sys/bus/pci/devices/<BDF>/qat_rl/sla_op
# cat /sys/bus/pci/devices/<BDF>/qat_rl/cap_rem
0

This attribute is only available for qat_4xxx devices.

/sys/bus/pci/devices/<BDF>/qat_rl/cir

Defined on file sysfs-driver-qat_rl

(RW) Committed information rate (CIR). Rate guaranteed to be achieved by a particular SLA. The value is expressed in permille scale, i.e. 1000 refers to the maximum device throughput for a selected service.

After sending a “get” to sla_op, this will be populated with the CIR for that queried SLA. Write to this file before sending an “add/update” sla_op, to set the SLA to the specified value.

Applicability in sla_op:

  • WRITE: add and update operations

  • READ: get operation

Example usage:

## Write
# echo 500 > /sys/bus/pci/devices/<BDF>/qat_rl/cir
# echo "add" /sys/bus/pci/devices/<BDF>/qat_rl/sla_op

## Read
# echo 4 > /sys/bus/pci/devices/<BDF>/qat_rl/id
# echo "get" > /sys/bus/pci/devices/<BDF>/qat_rl/sla_op
# cat /sys/bus/pci/devices/<BDF>/qat_rl/cir
500

This attribute is only available for qat_4xxx devices.

/sys/bus/pci/devices/<BDF>/qat_rl/id

Defined on file sysfs-driver-qat_rl

(RW) If written to, the value is used to retrieve a particular SLA and operate on it. This is valid only for the following operations: update, rm, and get. A read of this attribute is only guaranteed to have correct data after creation of an SLA.

Applicability in sla_op:

  • WRITE: rm and update operations

  • READ: add and get operations

Example usage:

## Read
## Set attributes e.g. cir, pir, srv, etc
# echo "add" > /sys/bus/pci/devices/<BDF>/qat_rl/sla_op
# cat /sys/bus/pci/devices/<BDF>/qat_rl/id
4

## Write
# echo 7 > /sys/bus/pci/devices/<BDF>/qat_rl/id
# echo "get" > /sys/bus/pci/devices/<BDF>/qat_rl/sla_op
# cat /sys/bus/pci/devices/<BDF>/qat_rl/rp
0x5  ## ring pair ID 0 and ring pair ID 2

This attribute is only available for qat_4xxx devices.

/sys/bus/pci/devices/<BDF>/qat_rl/pir

Defined on file sysfs-driver-qat_rl

(RW) Peak information rate (PIR). The maximum rate that can be achieved by that particular SLA. An SLA can reach a value between CIR and PIR when the device is not fully utilized by requests from other users (assigned to different SLAs).

After sending a “get” to sla_op, this will be populated with the PIR for that queried SLA. Write to this file before sending an “add/update” sla_op, to set the SLA to the specified value.

Applicability in sla_op:

  • WRITE: add and update operations

  • READ: get operation

Example usage:

## Write
# echo 750 > /sys/bus/pci/devices/<BDF>/qat_rl/pir
# echo "add" > /sys/bus/pci/devices/<BDF>/qat_rl/sla_op

## Read
# echo 4 > /sys/bus/pci/devices/<BDF>/qat_rl/id
# echo "get" > /sys/bus/pci/devices/<BDF>/qat_rl/sla_op
# cat /sys/bus/pci/devices/<BDF>/qat_rl/pir
750

This attribute is only available for qat_4xxx devices.

/sys/bus/pci/devices/<BDF>/qat_rl/rp

Defined on file sysfs-driver-qat_rl

(RW) When read, reports the current assigned ring pairs for the queried SLA. When wrote to, configures the ring pairs associated to a new SLA.

The value is a 64-bit bit mask and is written/displayed in hex. Each bit of this mask represents a single ring pair i.e., bit 1 == ring pair id 0; bit 3 == ring pair id 2.

Selected ring pairs must to be assigned to a single service, i.e. the one provided with the srv attribute. The service assigned to a certain ring pair can be checked by querying the attribute qat/rp2srv.

The maximum number of ring pairs is 4 per SLA.

Applicability in sla_op:

  • WRITE: add operation

  • READ: get operation

Example usage:

## Read
# echo 4 > /sys/bus/pci/devices/<BDF>/qat_rl/id
# cat /sys/bus/pci/devices/<BDF>/qat_rl/rp
0x5

## Write
# echo 0x5 > /sys/bus/pci/devices/<BDF>/qat_rl/rp

This attribute is only available for qat_4xxx devices.

/sys/bus/pci/devices/<BDF>/qat_rl/sla_op

Defined on file sysfs-driver-qat_rl

(WO) This attribute is used to perform an operation on an SLA. The supported operations are: add, update, rm, rm_all, and get.

Input values must be filled through the associated attribute in this group before a write to this file. If the operation completes successfully, the associated attributes will be updated. The associated attributes are: cir, pir, srv, rp, and id.

Supported operations:

  • add: Creates a new SLA with the provided inputs from user.

    • Inputs: cir, pir, srv, and rp

    • Output: id

  • get: Returns the configuration of the specified SLA in id attribute

    • Inputs: id

    • Outputs: cir, pir, srv, and rp

  • update: Updates the SLA with new values set in the following attributes

    • Inputs: id, cir, and pir

  • rm: Removes the specified SLA in the id attribute.

    • Inputs: id

  • rm_all: Removes all the configured SLAs.

    • Inputs: None

This attribute is only available for qat_4xxx devices.

/sys/bus/pci/devices/<BDF>/qat_rl/srv

Defined on file sysfs-driver-qat_rl

(RW) Service (SRV). Represents the service (sym, asym, dc) associated to an SLA. Can be written to or queried to set/show the SRV type for an SLA. The SRV attribute is used to specify the SRV type before adding an SLA. After an SLA is configured, reports the service associated to that SLA.

Applicability in sla_op:

  • WRITE: add and update operations

  • READ: get operation

Example usage:

## Write
# echo "dc" > /sys/bus/pci/devices/<BDF>/qat_rl/srv
# echo "add" > /sys/bus/pci/devices/<BDF>/qat_rl/sla_op
# cat /sys/bus/pci/devices/<BDF>/qat_rl/id
4

## Read
# echo 4 > /sys/bus/pci/devices/<BDF>/qat_rl/id
# echo "get" > /sys/bus/pci/devices/<BDF>/qat_rl/sla_op
# cat /sys/bus/pci/devices/<BDF>/qat_rl/srv
dc

This attribute is only available for qat_4xxx devices.

/sys/bus/pci/devices/<BDF>/rom_armor_enforced

Defined on file sysfs-driver-ccp

The /sys/bus/pci/devices/<BDF>/rom_armor_enforced file reports whether RomArmor SPI protection is enforced. Possible values: 0: Not enforced 1: Enforced

/sys/bus/pci/devices/<BDF>/rpmc_production_enabled

Defined on file sysfs-driver-ccp

The /sys/bus/pci/devices/<BDF>/rpmc_production_enabled file reports whether Replay Protected Monotonic Counter support has been enabled. Possible values: 0: Not enabled 1: Enabled

/sys/bus/pci/devices/<BDF>/rpmc_spirom_available

Defined on file sysfs-driver-ccp

The /sys/bus/pci/devices/<BDF>/rpmc_spirom_available file reports whether an Replay Protected Monotonic Counter supported SPI is installed on the system. Possible values: 0: Not present 1: Present

/sys/bus/pci/devices/<BDF>/tee_version

Defined on file sysfs-driver-ccp

The /sys/bus/pci/devices/<BDF>/tee_version file reports the firmware version of the AMD Trusted Execution Environment (TEE).

/sys/bus/pci/devices/<BDF>/tsme_status

Defined on file sysfs-driver-ccp

The /sys/bus/pci/devices/<BDF>/tsme_status file reports the status of transparent secure memory encryption on AMD systems. Possible values: 0: Not active 1: Active

/sys/bus/pci/devices/<dev>/aer_dev_correctable

Defined on file sysfs-bus-pci-devices-aer_stats

List of correctable errors seen and reported by this PCI device using ERR_COR. Note that since multiple errors may be reported using a single ERR_COR message, thus TOTAL_ERR_COR at the end of the file may not match the actual total of all the errors in the file. Sample output:

localhost /sys/devices/pci0000:00/0000:00:1c.0 # cat aer_dev_correctable
Receiver Error 2
Bad TLP 0
Bad DLLP 0
RELAY_NUM Rollover 0
Replay Timer Timeout 0
Advisory Non-Fatal 0
Corrected Internal Error 0
Header Log Overflow 0
TOTAL_ERR_COR 2

/sys/bus/pci/devices/<dev>/aer_dev_fatal

Defined on file sysfs-bus-pci-devices-aer_stats

List of uncorrectable fatal errors seen and reported by this PCI device using ERR_FATAL. Note that since multiple errors may be reported using a single ERR_FATAL message, thus TOTAL_ERR_FATAL at the end of the file may not match the actual total of all the errors in the file. Sample output:

localhost /sys/devices/pci0000:00/0000:00:1c.0 # cat aer_dev_fatal
Undefined 0
Data Link Protocol 0
Surprise Down Error 0
Poisoned TLP 0
Flow Control Protocol 0
Completion Timeout 0
Completer Abort 0
Unexpected Completion 0
Receiver Overflow 0
Malformed TLP 0
ECRC 0
Unsupported Request 0
ACS Violation 0
Uncorrectable Internal Error 0
MC Blocked TLP 0
AtomicOp Egress Blocked 0
TLP Prefix Blocked Error 0
TOTAL_ERR_FATAL 0

/sys/bus/pci/devices/<dev>/aer_dev_nonfatal

Defined on file sysfs-bus-pci-devices-aer_stats

List of uncorrectable nonfatal errors seen and reported by this PCI device using ERR_NONFATAL. Note that since multiple errors may be reported using a single ERR_FATAL message, thus TOTAL_ERR_NONFATAL at the end of the file may not match the actual total of all the errors in the file. Sample output:

localhost /sys/devices/pci0000:00/0000:00:1c.0 # cat aer_dev_nonfatal
Undefined 0
Data Link Protocol 0
Surprise Down Error 0
Poisoned TLP 0
Flow Control Protocol 0
Completion Timeout 0
Completer Abort 0
Unexpected Completion 0
Receiver Overflow 0
Malformed TLP 0
ECRC 0
Unsupported Request 0
ACS Violation 0
Uncorrectable Internal Error 0
MC Blocked TLP 0
AtomicOp Egress Blocked 0
TLP Prefix Blocked Error 0
TOTAL_ERR_NONFATAL 0

PCIe Rootport AER statistics

These attributes show up under only the rootports (or root complex event collectors) that are AER capable. These indicate the number of error messages as “reported to” the rootport. Please note that the rootports also transmit (internally) the ERR_* messages for errors seen by the internal rootport PCI device, so these counters include them and are thus cumulative of all the error messages on the PCI hierarchy originating at that root port.

/sys/bus/pci/devices/<dev>/aer_rootport_total_err_cor

Defined on file sysfs-bus-pci-devices-aer_stats

Total number of ERR_COR messages reported to rootport.

/sys/bus/pci/devices/<dev>/aer_rootport_total_err_fatal

Defined on file sysfs-bus-pci-devices-aer_stats

Total number of ERR_FATAL messages reported to rootport.

/sys/bus/pci/devices/<dev>/aer_rootport_total_err_nonfatal

Defined on file sysfs-bus-pci-devices-aer_stats

Total number of ERR_NONFATAL messages reported to rootport.

/sys/bus/pci/devices/<dev>/ccissX/cXdY/block:cciss!cXdY

Defined on file sysfs-bus-pci-devices-cciss

A symbolic link to /sys/block/cciss!cXdY

/sys/bus/pci/devices/<dev>/ccissX/cXdY/lunid

Defined on file sysfs-bus-pci-devices-cciss

Displays the 8-byte LUN ID used to address logical drive Y of controller X.

/sys/bus/pci/devices/<dev>/ccissX/cXdY/model

Defined on file sysfs-bus-pci-devices-cciss

Displays the SCSI INQUIRY page 0 model for logical drive Y of controller X.

/sys/bus/pci/devices/<dev>/ccissX/cXdY/raid_level

Defined on file sysfs-bus-pci-devices-cciss

Displays the RAID level of logical drive Y of controller X.

/sys/bus/pci/devices/<dev>/ccissX/cXdY/rev

Defined on file sysfs-bus-pci-devices-cciss

Displays the SCSI INQUIRY page 0 revision for logical drive Y of controller X.

/sys/bus/pci/devices/<dev>/ccissX/cXdY/unique_id

Defined on file sysfs-bus-pci-devices-cciss

Displays the SCSI INQUIRY page 83 serial number for logical drive Y of controller X.

/sys/bus/pci/devices/<dev>/ccissX/cXdY/usage_count

Defined on file sysfs-bus-pci-devices-cciss

Displays the usage count (number of opens) of logical drive Y of controller X.

/sys/bus/pci/devices/<dev>/ccissX/cXdY/vendor

Defined on file sysfs-bus-pci-devices-cciss

Displays the SCSI INQUIRY page 0 vendor for logical drive Y of controller X.

/sys/bus/pci/devices/<dev>/ccissX/rescan

Defined on file sysfs-bus-pci-devices-cciss

Kicks of a rescan of the controller to discover logical drive topology changes.

/sys/bus/pci/devices/<dev>/ccissX/resettable

Defined on file sysfs-bus-pci-devices-cciss

Value of 1 indicates the controller can honor the reset_devices kernel parameter. Value of 0 indicates reset_devices cannot be honored. This is to allow, for example, kexec tools to be able to warn the user if they designate an unresettable device as a dump device, as kdump requires resetting the device in order to work reliably.

/sys/bus/pci/devices/<dev>/ccissX/transport_mode

Defined on file sysfs-bus-pci-devices-cciss

Value of “simple” indicates that the controller has been placed in “simple mode”. Value of “performant” indicates that the controller has been placed in “performant mode”.

/sys/bus/pci/drivers/.../bind

/sys/devices/pciX/.../bind

Defined on file sysfs-bus-pci

Writing a device location to this file will cause the driver to attempt to bind to the device found at this location. This is useful for overriding default bindings. The format for the location is: DDDD:BB:DD.F. That is Domain:Bus:Device.Function and is the same as found in /sys/bus/pci/devices/. For example:

# echo 0000:00:19.0 > /sys/bus/pci/drivers/foo/bind

(Note: kernels before 2.6.28 may require echo -n).

/sys/bus/pci/drivers/.../new_id

/sys/devices/pciX/.../new_id

Defined on file sysfs-bus-pci

Writing a device ID to this file will attempt to dynamically add a new device ID to a PCI device driver. This may allow the driver to support more hardware than was included in the driver’s static device ID support table at compile time. The format for the device ID is: VVVV DDDD SVVV SDDD CCCC MMMM PPPP. That is Vendor ID, Device ID, Subsystem Vendor ID, Subsystem Device ID, Class, Class Mask, and Private Driver Data. The Vendor ID and Device ID fields are required, the rest are optional. Upon successfully adding an ID, the driver will probe for the device and attempt to bind to it. For example:

# echo "8086 10f5" > /sys/bus/pci/drivers/foo/new_id

/sys/bus/pci/drivers/.../remove_id

/sys/devices/pciX/.../remove_id

Defined on file sysfs-bus-pci

Writing a device ID to this file will remove an ID that was dynamically added via the new_id sysfs entry. The format for the device ID is: VVVV DDDD SVVV SDDD CCCC MMMM. That is Vendor ID, Device ID, Subsystem Vendor ID, Subsystem Device ID, Class, and Class Mask. The Vendor ID and Device ID fields are required, the rest are optional. After successfully removing an ID, the driver will no longer support the device. This is useful to ensure auto probing won’t match the driver to the device. For example:

# echo "8086 10f5" > /sys/bus/pci/drivers/foo/remove_id

/sys/bus/pci/drivers/.../unbind

/sys/devices/pciX/.../unbind

Defined on file sysfs-bus-pci

Writing a device location to this file will cause the driver to attempt to unbind from the device found at this location. This may be useful when overriding default bindings. The format for the location is: DDDD:BB:DD.F. That is Domain:Bus:Device.Function and is the same as found in /sys/bus/pci/devices/. For example:

# echo 0000:00:19.0 > /sys/bus/pci/drivers/foo/unbind

(Note: kernels before 2.6.28 may require echo -n).

/sys/bus/pci/drivers/altera-cvp/chkcfg

Defined on file sysfs-driver-altera-cvp

Contains either 1 or 0 and controls if configuration error checking in altera-cvp driver is turned on or off.

/sys/bus/pci/drivers/ehci_hcd/.../companion

Defined on file sysfs-bus-pci-drivers-ehci_hcd

PCI-based EHCI USB controllers (i.e., high-speed USB-2.0 controllers) are often implemented along with a set of “companion” full/low-speed USB-1.1 controllers. When a high-speed device is plugged in, the connection is routed to the EHCI controller; when a full- or low-speed device is plugged in, the connection is routed to the companion controller.

Sometimes you want to force a high-speed device to connect at full speed, which can be accomplished by forcing the connection to be routed to the companion controller. That’s what this file does. Writing a port number to the file causes connections on that port to be routed to the companion controller, and writing the negative of a port number returns the port to normal operation.

For example: To force the high-speed device attached to port 4 on bus 2 to run at full speed:

echo 4 >/sys/bus/usb/devices/usb2/../companion

To return the port to high-speed operation:

echo -4 >/sys/bus/usb/devices/usb2/../companion

Reading the file gives the list of ports currently forced to the companion controller.

Note: Some EHCI controllers do not have companions; they may contain an internal “transaction translator” or they may be attached directly to a “rate-matching hub”. This mechanism will not work with such controllers. Also, it cannot be used to force a port on a high-speed hub to connect at full speed.

Note: When this file was first added, it appeared in a different sysfs directory. The location given above is correct for 2.6.35 (and probably several earlier kernel versions as well).

/sys/bus/pci/drivers/i915/.../hwmon/hwmon<i>/curr1_crit

Defined on file sysfs-driver-intel-i915-hwmon

RW. Card reactive critical (I1) power limit in milliamperes.

Card reactive critical (I1) power limit in milliamperes is exposed for server products. The power controller will throttle the operating frequency if the power averaged over a window exceeds this limit.

Only supported for particular Intel i915 graphics platforms.

/sys/bus/pci/drivers/i915/.../hwmon/hwmon<i>/energy1_input

Defined on file sysfs-driver-intel-i915-hwmon

RO. Energy input of device or gt in microjoules.

For i915 device level hwmon devices (name “i915”) this reflects energy input for the entire device. For gt level hwmon devices (name “i915_gtN”) this reflects energy input for the gt.

Only supported for particular Intel i915 graphics platforms.

/sys/bus/pci/drivers/i915/.../hwmon/hwmon<i>/in0_input

Defined on file sysfs-driver-intel-i915-hwmon

RO. Current Voltage in millivolt.

Only supported for particular Intel i915 graphics platforms.

/sys/bus/pci/drivers/i915/.../hwmon/hwmon<i>/power1_crit

Defined on file sysfs-driver-intel-i915-hwmon

RW. Card reactive critical (I1) power limit in microwatts.

Card reactive critical (I1) power limit in microwatts is exposed for client products. The power controller will throttle the operating frequency if the power averaged over a window exceeds this limit.

Only supported for particular Intel i915 graphics platforms.

/sys/bus/pci/drivers/i915/.../hwmon/hwmon<i>/power1_max

Defined on file sysfs-driver-intel-i915-hwmon

RW. Card reactive sustained (PL1/Tau) power limit in microwatts.

The power controller will throttle the operating frequency if the power averaged over a window (typically seconds) exceeds this limit. A read value of 0 means that the PL1 power limit is disabled, writing 0 disables the limit. Writing values > 0 will enable the power limit.

Only supported for particular Intel i915 graphics platforms.

/sys/bus/pci/drivers/i915/.../hwmon/hwmon<i>/power1_max_interval

Defined on file sysfs-driver-intel-i915-hwmon

RW. Sustained power limit interval (Tau in PL1/Tau) in milliseconds over which sustained power is averaged.

Only supported for particular Intel i915 graphics platforms.

/sys/bus/pci/drivers/i915/.../hwmon/hwmon<i>/power1_rated_max

Defined on file sysfs-driver-intel-i915-hwmon

RO. Card default power limit (default TDP setting).

Only supported for particular Intel i915 graphics platforms.

/sys/bus/pci/drivers/janz-cmodio/.../modulbus_number

Defined on file sysfs-bus-pci-drivers-janz-cmodio

Value representing the HEX switch S2 of the janz carrier board CMOD-IO or CAN-PCI2

Read-only: value of the configuration switch (0..15)

/sys/bus/pci/drivers/pciback/allow_interrupt_control

Defined on file sysfs-driver-pciback

List of devices which can have interrupt control flag (INTx, MSI, MSI-X) set by a connected guest. It is meant to be set only when the guest is a stubdomain hosting device model (qemu) and the actual device is assigned to a HVM. It is not safe (similar to permissive attribute) to set for a devices assigned to a PV guest. The device is automatically removed from this list when the connected pcifront terminates.

/sys/bus/pci/drivers/pciback/quirks

Defined on file sysfs-driver-pciback

If the permissive attribute is set, then writing a string in the format of DDDD:BB:DD.F-REG:SIZE:MASK will allow the guest to write and read from the PCI device. That is Domain:Bus: Device.Function-Register:Size:Mask (Domain is optional). For example:

#echo 00:19.0-E0:2:FF > /sys/bus/pci/drivers/pciback/quirks

will allow the guest to read and write to the configuration register 0x0E.

/sys/bus/pci/drivers/xe/.../hwmon/hwmon<i>/curr2_crit

Defined on file sysfs-driver-intel-xe-hwmon

RW. Package reactive critical (I1) power limit in milliamperes.

Package reactive critical (I1) power limit in milliamperes is exposed for server products. The power controller will throttle the operating frequency if the power averaged over a window exceeds this limit.

/sys/bus/pci/drivers/xe/.../hwmon/hwmon<i>/energy1_input

Defined on file sysfs-driver-intel-xe-hwmon

RO. Card energy input of device in microjoules.

Only supported for particular Intel Xe graphics platforms.

/sys/bus/pci/drivers/xe/.../hwmon/hwmon<i>/energy2_input

Defined on file sysfs-driver-intel-xe-hwmon

RO. Package energy input of device in microjoules.

Only supported for particular Intel Xe graphics platforms.

/sys/bus/pci/drivers/xe/.../hwmon/hwmon<i>/in1_input

Defined on file sysfs-driver-intel-xe-hwmon

RO. Package current voltage in millivolt.

Only supported for particular Intel Xe graphics platforms.

/sys/bus/pci/drivers/xe/.../hwmon/hwmon<i>/power1_max

Defined on file sysfs-driver-intel-xe-hwmon

RW. Card reactive sustained (PL1) power limit in microwatts.

The power controller will throttle the operating frequency if the power averaged over a window (typically seconds) exceeds this limit. A read value of 0 means that the PL1 power limit is disabled, writing 0 disables the limit. Writing values > 0 and <= TDP will enable the power limit.

Only supported for particular Intel Xe graphics platforms.

/sys/bus/pci/drivers/xe/.../hwmon/hwmon<i>/power1_max_interval

Defined on file sysfs-driver-intel-xe-hwmon

RW. Card sustained power limit interval (Tau in PL1/Tau) in milliseconds over which sustained power is averaged.

Only supported for particular Intel Xe graphics platforms.

/sys/bus/pci/drivers/xe/.../hwmon/hwmon<i>/power1_rated_max

Defined on file sysfs-driver-intel-xe-hwmon

RO. Card default power limit (default TDP setting).

Only supported for particular Intel Xe graphics platforms.

/sys/bus/pci/drivers/xe/.../hwmon/hwmon<i>/power2_crit

Defined on file sysfs-driver-intel-xe-hwmon

RW. Package reactive critical (I1) power limit in microwatts.

Package reactive critical (I1) power limit in microwatts is exposed for client products. The power controller will throttle the operating frequency if the power averaged over a window exceeds this limit.

Only supported for particular Intel Xe graphics platforms.

/sys/bus/pci/drivers/xe/.../hwmon/hwmon<i>/power2_max

Defined on file sysfs-driver-intel-xe-hwmon

RW. Package reactive sustained (PL1) power limit in microwatts.

The power controller will throttle the operating frequency if the power averaged over a window (typically seconds) exceeds this limit. A read value of 0 means that the PL1 power limit is disabled, writing 0 disables the limit. Writing values > 0 and <= TDP will enable the power limit.

Only supported for particular Intel Xe graphics platforms.

/sys/bus/pci/drivers/xe/.../hwmon/hwmon<i>/power2_max_interval

Defined on file sysfs-driver-intel-xe-hwmon

RW. Package sustained power limit interval (Tau in PL1/Tau) in milliseconds over which sustained power is averaged.

Only supported for particular Intel Xe graphics platforms.

/sys/bus/pci/drivers/xe/.../hwmon/hwmon<i>/power2_rated_max

Defined on file sysfs-driver-intel-xe-hwmon

RO. Package default power limit (default TDP setting).

Only supported for particular Intel Xe graphics platforms.

/sys/bus/pci/drivers/xhci_hcd/.../dbc

Defined on file sysfs-bus-pci-drivers-xhci_hcd

xHCI compatible USB host controllers (i.e. super-speed USB3 controllers) are often implemented with the Debug Capability (DbC). It can present a debug device which is fully compliant with the USB framework and provides the equivalent of a very high performance full-duplex serial link for debug purpose.

The DbC debug device shares a root port with xHCI host. When the DbC is enabled, the root port will be assigned to the Debug Capability. Otherwise, it will be assigned to xHCI.

Writing “enable” to this attribute will enable the DbC functionality and the shared root port will be assigned to the DbC device. Writing “disable” to this attribute will disable the DbC functionality and the shared root port will roll back to the xHCI.

Reading this attribute gives the state of the DbC. It can be one of the following states: disabled, enabled, initialized, connected, configured and stalled.

/sys/bus/pci/drivers/xhci_hcd/.../dbc_bInterfaceProtocol

Defined on file sysfs-bus-pci-drivers-xhci_hcd

This attribute lets us change the bInterfaceProtocol field presented in the USB Interface descriptor by the xhci debug device. Value can only be changed while debug capability (DbC) is in disabled state to prevent USB descriptor change while connected to a USB host. The default value is 1 (GNU Remote Debug command). Other permissible value is 0 which is for vendor defined debug target.

/sys/bus/pci/drivers/xhci_hcd/.../dbc_bcdDevice

Defined on file sysfs-bus-pci-drivers-xhci_hcd

This dbc_bcdDevice attribute lets us change the bcdDevice field presented in the USB device descriptor by this xhci debug device. Value can only be changed while debug capability (DbC) is in disabled state to prevent USB device descriptor change while connected to a USB host. The default value is 0x0010. (device rev 0.10) It can be any 16-bit integer.

/sys/bus/pci/drivers/xhci_hcd/.../dbc_idProduct

Defined on file sysfs-bus-pci-drivers-xhci_hcd

This dbc_idProduct attribute lets us change the idProduct field presented in the USB device descriptor by this xhci debug device. Value can only be changed while debug capability (DbC) is in disabled state to prevent USB device descriptor change while connected to a USB host. The default value is 0x0010. It can be any 16-bit integer.

/sys/bus/pci/drivers/xhci_hcd/.../dbc_idVendor

Defined on file sysfs-bus-pci-drivers-xhci_hcd

This dbc_idVendor attribute lets us change the idVendor field presented in the USB device descriptor by this xhci debug device. Value can only be changed while debug capability (DbC) is in disabled state to prevent USB device descriptor change while connected to a USB host. The default value is 0x1d6b (Linux Foundation). It can be any 16-bit integer.

/sys/bus/pci/drivers/xhci_hcd/.../dbc_poll_interval_ms

Defined on file sysfs-bus-pci-drivers-xhci_hcd

This attribute adjust the polling interval used to check for DbC events. Unit is milliseconds. Accepted values range from 0 up to 5000. The default value is 64 ms. This polling interval is used while DbC is enabled but has no active data transfers.

/sys/bus/pci/rescan

Defined on file sysfs-bus-pci

Writing a non-zero value to this attribute will force a rescan of all PCI buses in the system, and re-discover previously removed devices.

/sys/bus/pci/slots/.../module

Defined on file sysfs-bus-pci

This symbolic link points to the PCI hotplug controller driver module that manages the hotplug slot.

/sys/bus/peci/devices/<controller_id>-<device_addr>/remove

Defined on file sysfs-bus-peci

Writing a non-zero value to this attribute will remove the PECI device and any of its children.

/sys/bus/peci/rescan

Defined on file sysfs-bus-peci

Writing a non-zero value to this attribute will initiate scan for PECI devices on all PECI controllers in the system.

/sys/bus/platform/devices/*/frequency

Defined on file sysfs-platform-brcmstb-memc

DDR PHY frequency in Hz.

/sys/bus/platform/devices/*/srpd

Defined on file sysfs-platform-brcmstb-memc

Self Refresh Power Down (SRPD) inactivity timeout counted in internal DDR controller clock cycles. Possible values range from 0 (disable inactivity timeout) to 65535 (0xffff).

/sys/bus/platform/devices/*twl4030-usb/vbus

Defined on file sysfs-platform-twl4030-usb

Read-only status reporting if VBUS (approx 5V) is being supplied by the USB bus.

Possible values: “on”, “off”.

Changes are notified via select/poll.

/sys/bus/platform/devices/.../driver_override

Defined on file sysfs-bus-platform

This file allows the driver for a device to be specified which will override standard OF, ACPI, ID table, and name matching. When specified, only a driver with a name matching the value written to driver_override will have an opportunity to bind to the device. The override is specified by writing a string to the driver_override file (echo vfio-platform > driver_override) and may be cleared with an empty string (echo > driver_override). This returns the device to standard matching rules binding. Writing to driver_override does not automatically unbind the device from its current driver or make any attempt to automatically load the specified driver. If no driver with a matching name is currently loaded in the kernel, the device will not bind to any driver. This also allows devices to opt-out of driver binding using a driver_override name such as “none”. Only a single driver may be specified in the override, there is no support for parsing delimiters.

/sys/bus/platform/devices/.../modalias

Defined on file sysfs-bus-platform

Same as MODALIAS in the uevent at device creation.

A platform device that it is exposed via devicetree uses:

  • of:N`of node name`T`type`

Other platform devices use, instead:

  • platform:driver name

/sys/bus/platform/devices/.../msi_irqs/

Defined on file sysfs-bus-platform

The /sys/devices/.../msi_irqs directory contains a variable set of files, with each file being named after a corresponding msi irq vector allocated to that device.

/sys/bus/platform/devices/.../msi_irqs/<N>

Defined on file sysfs-bus-platform

This attribute will show “msi” if <N> is a valid msi irq

/sys/bus/platform/devices/.../numa_node

Defined on file sysfs-bus-platform

This file contains the NUMA node to which the platform device is attached. It won’t be visible if the node is unknown. The value comes from an ACPI _PXM method or a similar firmware source. Initial users for this file would be devices like arm smmu which are populated by arm64 acpi_iort.

/sys/bus/platform/devices/../cfam_reset

Defined on file sysfs-bus-fsi

Provides a means of resetting the cfam that is attached to the FSI device.

/sys/bus/platform/devices/../fsi-master/fsi0/break

Defined on file sysfs-bus-fsi

Sends an FSI BREAK command on a master’s communication link to any connected slaves. A BREAK resets connected device’s logic and preps it to receive further commands from the master.

/sys/bus/platform/devices/../fsi-master/fsi0/rescan

Defined on file sysfs-bus-fsi

Initiates a FSI master scan for all connected slave devices on its links.

/sys/bus/platform/devices/../fsi-master/fsi0/slave@00:00/raw

Defined on file sysfs-bus-fsi

Provides a means of reading/writing a 32 bit value from/to a specified FSI bus address.

/sys/bus/platform/devices/../fsi-master/fsi0/slave@00:00/term

Defined on file sysfs-bus-fsi

Sends an FSI terminate command from the master to its connected slave. A terminate resets the slave’s state machines that control access to the internally connected engines. In addition the slave freezes its internal error register for debugging purposes. This command is also needed to abort any ongoing operation in case of an expired ‘Master Time Out’ timer.

/sys/bus/platform/devices/<dev>/always_powered_in_suspend

Defined on file sysfs-bus-platform-onboard-usb-dev

(RW) Controls whether the USB hub remains always powered during system suspend or not. This attribute is not available for non-hub devices.

/sys/bus/platform/devices/ACPI000E:00/ac_alarm

Defined on file sysfs-devices-platform-ACPI-TAD

(RW) The AC alarm timer value.

Reads return the current AC alarm timer value in seconds or “disabled”, if the AC alarm is not set to wake up the system.

Write a new AC alarm timer value in seconds or “disabled” to it to set the AC alarm timer or to disable it, respectively.

If the AC alarm timer is set through this attribute and it expires, it will immediately wake up the system from the S3 sleep state (and from S4/S5 too if supported) until its status is explicitly cleared via the ac_status attribute.

/sys/bus/platform/devices/ACPI000E:00/ac_policy

Defined on file sysfs-devices-platform-ACPI-TAD

(RW) The AC alarm expired timer wake policy (see ACPI 6.2, Section 9.18 for details).

Reads return the current expired timer wake delay for the AC alarm timer or “never”, if the policy is to discard AC timer wakeups if the system is on DC power.

Write a new expired timer wake delay for the AC alarm timer in seconds or “never” to it to set the expired timer wake delay for the AC alarm timer or to set its expired wake policy to discard wakeups if the system is on DC power, respectively.

/sys/bus/platform/devices/ACPI000E:00/ac_status

Defined on file sysfs-devices-platform-ACPI-TAD

(RW) The AC alarm status.

Reads return a hexadecimal bitmask representing the AC alarm timer status with the following meaning of bits (see ACPI 6.2, Section 9.18.5):

Bit(0):

The timer has expired if set.

Bit(1):

The timer has woken up the system from a sleep state (S3 or S4/S5 if supported) if set.

The other bits are reserved.

Reads also cause the AC alarm timer status to be reset.

Another way to reset the status of the AC alarm timer is to write (the number) 0 to this file.

If the status return value indicates that the timer has expired, it will immediately wake up the system from the S3 sleep state (and from S4/S5 too if supported) until its status is explicitly cleared through this attribute.

/sys/bus/platform/devices/ACPI000E:00/caps

Defined on file sysfs-devices-platform-ACPI-TAD

(RO) Hexadecimal bitmask of the TAD attributes are reported by the platform firmware (see ACPI 6.2, section 9.18.2):

BIT(0):

AC wakeup implemented if set

BIT(1):

DC wakeup implemented if set

BIT(2):

Get/set real time features implemented if set

BIT(3):

Real time accuracy in milliseconds if set

BIT(4):

Correct status reported for wakeups from S4/S5 if set

BIT(5):

The AC timer wakes up from S4 if set

BIT(6):

The AC timer wakes up from S5 if set

BIT(7):

The DC timer wakes up from S4 if set

BIT(8):

The DC timer wakes up from S5 if set

The other bits are reserved.

/sys/bus/platform/devices/ACPI000E:00/dc_alarm

Defined on file sysfs-devices-platform-ACPI-TAD

(RW,optional) The DC alarm timer value.

This attribute is only present if the TAD supports a separate DC timer.

It is analogous to the ac_alarm attribute.

/sys/bus/platform/devices/ACPI000E:00/dc_policy

Defined on file sysfs-devices-platform-ACPI-TAD

(RW,optional) The DC alarm expired timer wake policy.

This attribute is only present if the TAD supports a separate DC timer.

It is analogous to the ac_policy attribute.

/sys/bus/platform/devices/ACPI000E:00/dc_status

Defined on file sysfs-devices-platform-ACPI-TAD

(RW,optional) The DC alarm status.

This attribute is only present if the TAD supports a separate DC timer.

It is analogous to the ac_status attribute.

/sys/bus/platform/devices/GGL0001:*/BINF.2

Defined on file sysfs-driver-chromeos-acpi

Returns active EC firmware of current boot (boolean).

0

Read only (recovery) firmware.

1

Rewritable firmware.

/sys/bus/platform/devices/GGL0001:*/BINF.3

Defined on file sysfs-driver-chromeos-acpi

Returns main firmware type for current boot (integer).

0

Recovery.

1

Normal.

2

Developer.

3

Netboot (factory installation only).

/sys/bus/platform/devices/GGL0001:*/CHSW

Defined on file sysfs-driver-chromeos-acpi

Returns switch position for Chrome OS specific hardware switches when the firmware is booted (integer).

0

No changes.

2

Recovery button was pressed.

4

Recovery button was pressed (EC firmware).

32

Developer switch was enabled.

512

Firmware write protection was disabled.

/sys/bus/platform/devices/GGL0001:*/FMAP

Defined on file sysfs-driver-chromeos-acpi

Returns physical memory address of the start of the main processor firmware flashmap.

/sys/bus/platform/devices/GGL0001:*/FRID

Defined on file sysfs-driver-chromeos-acpi

Returns firmware version for the read-only portion of the main processor firmware.

/sys/bus/platform/devices/GGL0001:*/FWID

Defined on file sysfs-driver-chromeos-acpi

Returns firmware version for the rewritable portion of the main processor firmware.

/sys/bus/platform/devices/GGL0001:*/GPIO.X/GPIO.0

Defined on file sysfs-driver-chromeos-acpi

Returns type of the GPIO signal for the Chrome OS specific GPIO assignments (integer).

1

Recovery button.

2

Developer mode switch.

3

Firmware write protection switch.

256 to 511

Debug header GPIO 0 to GPIO 255.

/sys/bus/platform/devices/GGL0001:*/GPIO.X/GPIO.1

Defined on file sysfs-driver-chromeos-acpi

Returns signal attributes of the GPIO signal (integer bitfield).

0

Signal is active low.

1

Signal is active high.

/sys/bus/platform/devices/GGL0001:*/GPIO.X/GPIO.2

Defined on file sysfs-driver-chromeos-acpi

Returns the GPIO number on the specified GPIO controller.

/sys/bus/platform/devices/GGL0001:*/GPIO.X/GPIO.3

Defined on file sysfs-driver-chromeos-acpi

Returns name of the GPIO controller.

/sys/bus/platform/devices/GGL0001:*/HWID

Defined on file sysfs-driver-chromeos-acpi

Returns hardware ID for the Chromebook.

/sys/bus/platform/devices/GGL0001:*/MECK

Defined on file sysfs-driver-chromeos-acpi

Returns the SHA-1 or SHA-256 hash that is read out of the Management Engine extended registers during boot. The hash is exported via ACPI so the OS can verify that the Management Engine firmware has not changed. If Management Engine is not present, or if the firmware was unable to read the extended registers, this buffer size can be zero.

/sys/bus/platform/devices/GGL0001:*/VBNV.0

Defined on file sysfs-driver-chromeos-acpi

Returns offset in CMOS bank 0 of the verified boot non-volatile storage block, counting from the first writable CMOS byte (that is, ‘offset = 0’ is the byte following the 14 bytes of clock data).

/sys/bus/platform/devices/GGL0001:*/VBNV.1

Defined on file sysfs-driver-chromeos-acpi

Return the size in bytes of the verified boot non-volatile storage block.

/sys/bus/platform/devices/GGL0001:*/VDAT

Defined on file sysfs-driver-chromeos-acpi

Returns the verified boot data block shared between the firmware verification step and the kernel verification step (hex dump).

/sys/bus/platform/devices/GOOG000C\:00/boot_on_ac

Defined on file sysfs-platform-wilco-ec

Boot on AC is a policy which makes the device boot from S5 when AC power is connected. This is useful for users who want to run their device headless or with a dock.

Input should be parseable by kstrtou8() to 0 or 1.

/sys/bus/platform/devices/GOOG000C\:00/build_date

Defined on file sysfs-platform-wilco-ec

Display Wilco Embedded Controller firmware build date. Output will a MM/DD/YY string.

/sys/bus/platform/devices/GOOG000C\:00/build_revision

Defined on file sysfs-platform-wilco-ec

Display Wilco Embedded Controller build revision. Output will a version string be similar to the example below: d2592cae0

/sys/bus/platform/devices/GOOG000C\:00/model_number

Defined on file sysfs-platform-wilco-ec

Display Wilco Embedded Controller model number. Output will a version string be similar to the example below: 08B6

/sys/bus/platform/devices/GOOG000C\:00/usb_charge

Defined on file sysfs-platform-wilco-ec

Control the USB PowerShare Policy. USB PowerShare is a policy which affects charging via the special USB PowerShare port (marked with a small lightning bolt or battery icon) when in low power states:

  • In S0, the port will always provide power.

  • In S0ix, if usb_charge is enabled, then power will be supplied to the port when on AC or if battery is > 50%. Else no power is supplied.

  • In S5, if usb_charge is enabled, then power will be supplied to the port when on AC. Else no power is supplied.

Input should be either “0” or “1”.

/sys/bus/platform/devices/GOOG000C\:00/version

Defined on file sysfs-platform-wilco-ec

Display Wilco Embedded Controller firmware version. The format of the string is x.y.z. Where x is major, y is minor and z is the build number. For example: 95.00.06

/sys/bus/platform/devices/INT3407:00/dptf_power/adapter_rating_mw

Defined on file sysfs-platform-dptf

(RO) Adapter rating in milliwatts (the maximum Adapter power). Must be 0 if no AC Adaptor is plugged in.

/sys/bus/platform/devices/INT3407:00/dptf_power/battery_steady_power

Defined on file sysfs-platform-dptf

(RO) The maximum sustained power for battery in milliwatts.

/sys/bus/platform/devices/INT3407:00/dptf_power/charger_type

Defined on file sysfs-platform-dptf

(RO) The charger type - Traditional, Hybrid or NVDC.

/sys/bus/platform/devices/INT3407:00/dptf_power/max_platform_power_mw

Defined on file sysfs-platform-dptf

(RO) Maximum platform power that can be supported by the battery in milliwatts.

/sys/bus/platform/devices/INT3407:00/dptf_power/platform_power_source

Defined on file sysfs-platform-dptf

(RO) Display the platform power source

bits[3:0]

Current power source - 0x00 = DC - 0x01 = AC - 0x02 = USB - 0x03 = Wireless Charger

bits[7:4]

Power source sequence number

/sys/bus/platform/devices/INT3407:00/dptf_power/prochot_confirm

Defined on file sysfs-platform-dptf

(WO) Confirm embedded controller about a prochot notification.

/sys/bus/platform/devices/INT3407:00/dptf_power/rest_of_platform_power_mw

Defined on file sysfs-platform-dptf

(RO) Shows the rest (outside of SoC) of worst-case platform power.

/sys/bus/platform/devices/INT3532:00/dptf_battery/current_discharge_capbility_ma

Defined on file sysfs-platform-dptf

(RO) The battery discharge current capability obtained from battery fuel gauge in milli Amps.

/sys/bus/platform/devices/INT3532:00/dptf_battery/high_freq_impedance_mohm

Defined on file sysfs-platform-dptf

(RO) The high frequency impedance value that can be obtained from battery fuel gauge in milli Ohms.

/sys/bus/platform/devices/INT3532:00/dptf_battery/max_platform_power_mw

Defined on file sysfs-platform-dptf

(RO) The maximum platform power that can be supported by the battery in milli watts.

/sys/bus/platform/devices/INT3532:00/dptf_battery/max_steady_state_power_mw

Defined on file sysfs-platform-dptf

(RO) The maximum sustained power for battery in milli watts.

/sys/bus/platform/devices/INT3532:00/dptf_battery/no_load_voltage_mv

Defined on file sysfs-platform-dptf

(RO) The no-load voltage that can be obtained from battery fuel gauge in milli volts.

/sys/bus/platform/devices/INTC1045:00/pch_fivr_switch_frequency/fivr_switching_fault_status

Defined on file sysfs-platform-dptf

(RO) Read the FIVR switching frequency control fault status.

/sys/bus/platform/devices/INTC1045:00/pch_fivr_switch_frequency/fivr_switching_freq_mhz

Defined on file sysfs-platform-dptf

(RO) Get the FIVR switching control frequency in MHz.

/sys/bus/platform/devices/INTC1045:00/pch_fivr_switch_frequency/freq_mhz_high_clock

Defined on file sysfs-platform-dptf

(RW) The PCH FIVR (Fully Integrated Voltage Regulator) switching frequency in MHz, when FIVR clock is 38.4MHz.

/sys/bus/platform/devices/INTC1045:00/pch_fivr_switch_frequency/freq_mhz_low_clock

Defined on file sysfs-platform-dptf

(RW) The PCH FIVR (Fully Integrated Voltage Regulator) switching frequency in MHz, when FIVR clock is 19.2MHz or 24MHz.

/sys/bus/platform/devices/INTC1045:00/pch_fivr_switch_frequency/ssc_clock_info

Defined on file sysfs-platform-dptf

(RO) Presents SSC (spread spectrum clock) information for EMI (Electro magnetic interference) control. This is a bit mask.

Bits

Description

[7:0]

Sets clock spectrum spread percentage: 0x00=0.2% , 0x3F=10% 1 LSB = 0.1% increase in spread (for settings 0x01 thru 0x1C) 1 LSB = 0.2% increase in spread (for settings 0x1E thru 0x3F)

[8]

When set to 1, enables spread spectrum clock

[9]

0: Triangle mode. FFC frequency walks around the Fcenter in a linear fashion 1: Random walk mode. FFC frequency changes randomly within the SSC (Spread spectrum clock) range

[10]

0: No white noise. 1: Add white noise to spread waveform

[11]

When 1, future writes are ignored.

/sys/bus/platform/devices/INTC1092:00/intc_data

Defined on file sysfs-driver-intc_sar

This sysfs entry is used to retrieve Dynamic SAR information emitted/maintained by a BIOS that supports Dynamic SAR.

The retrieved information is in the order given below: - device_mode - bandtable_index - antennatable_index - sartable_index

The above information is sent as integer values separated by a single space. This information can then be pushed to a WWAN modem that uses this to control the transmit signal level using the Band/Antenna/SAR table index information. These parameters are derived/decided by aggregating device-mode like laptop/tablet/clamshell etc. and the proximity-sensor data available to the embedded controller on given host. The regulatory mode configured on Dynamic SAR driver also influences these values.

The userspace applications can poll for changes to this file using POLLPRI event on file-descriptor (fd) obtained by opening this sysfs entry. Application can then read this information from the sysfs node and consume the given information.

/sys/bus/platform/devices/INTC1092:00/intc_reg

Defined on file sysfs-driver-intc_sar

Specific Absorption Rate (SAR) regulatory mode is typically derived based on information like mcc (Mobile Country Code) and mnc (Mobile Network Code) that is available for the currently attached LTE network. A userspace application is required to set the current SAR regulatory mode on the Dynamic SAR driver using this sysfs node. Such an application can also read back using this sysfs node, the currently configured regulatory mode value from the Dynamic SAR driver.

Acceptable regulatory modes are:

0

FCC

1

CE

2

ISED

  • The regulatory mode value has one of the above values.

  • The default regulatory mode used in the driver is 0.

/sys/bus/platform/devices/MLNXBF04:00/bootfifo

Defined on file sysfs-platform-mellanox-bootctl

The file used to access the BlueField boot fifo.

/sys/bus/platform/devices/MLNXBF04:00/lifecycle_state

Defined on file sysfs-platform-mellanox-bootctl

The Life-cycle state of the SoC, which could be one of the following values.

Production

Production state and can be updated to secure

GA Secured

Secure chip and not able to change state

GA Non-Secured

Non-Secure chip and not able to change state

RMA

Return Merchandise Authorization

/sys/bus/platform/devices/MLNXBF04:00/mfg_lock

Defined on file sysfs-platform-mellanox-bootctl

The “mfg_lock” sysfs attribute is write-only. A successful write to this attribute will latch the board-level attributes into EEPROM, making them read-only.

/sys/bus/platform/devices/MLNXBF04:00/modl

Defined on file sysfs-platform-mellanox-bootctl

The “modl” sysfs attribute holds the board’s model number. This value is provided on a board-level label.

/sys/bus/platform/devices/MLNXBF04:00/oob_mac

Defined on file sysfs-platform-mellanox-bootctl

The “oob_mac” sysfs attribute holds the MAC address for the out-of-band 1Gbps Ethernet port. This MAC address is provided on a board-level label.

/sys/bus/platform/devices/MLNXBF04:00/opn

Defined on file sysfs-platform-mellanox-bootctl

The “opn” sysfs attribute holds the board’s part number. This value is provided on a board-level label.

/sys/bus/platform/devices/MLNXBF04:00/post_reset_wdog

Defined on file sysfs-platform-mellanox-bootctl

The watchdog setting in seconds for the next booting. It’s used to reboot the chip and recover it to the old state if the new boot partition fails.

/sys/bus/platform/devices/MLNXBF04:00/reset_action

Defined on file sysfs-platform-mellanox-bootctl

The source of the boot stream for the next reset. It could be one of the following values:

external

boot from external source (USB or PCIe)

emmc

boot from the onchip eMMC

emmc_legacy

boot from the onchip eMMC in legacy (slow) mode

/sys/bus/platform/devices/MLNXBF04:00/rev

Defined on file sysfs-platform-mellanox-bootctl

The “rev” sysfs attribute holds the board’s revision. This value is provided on a board-level label.

/sys/bus/platform/devices/MLNXBF04:00/rsh_log

Defined on file sysfs-platform-mellanox-bootctl

The file used to write BlueField boot log with the format “[INFO|WARN|ERR|ASSERT ]<msg>”. Log level ‘INFO’ is used by default if not specified.

/sys/bus/platform/devices/MLNXBF04:00/second_reset_action

Defined on file sysfs-platform-mellanox-bootctl

Update the source of the boot stream after next reset. It could be one of the following values and will be applied after next reset.

external

boot from external source (USB or PCIe)

emmc

boot from the onchip eMMC

emmc_legacy

boot from the onchip eMMC in legacy (slow) mode

swap_emmc

swap the primary / secondary boot partition

none

cancel the action

/sys/bus/platform/devices/MLNXBF04:00/secure_boot_fuse_state

Defined on file sysfs-platform-mellanox-bootctl

The state of eFuse versions with the following values.

InUse

burnt, valid and currently in use

Used

burnt and valid

Free

not burnt and free to use

Skipped

not burnt but not free (skipped)

Wasted

burnt and invalid

Invalid

not burnt but marked as valid (error state).

/sys/bus/platform/devices/MLNXBF04:00/sku

Defined on file sysfs-platform-mellanox-bootctl

The “sku” sysfs attribute holds the board’s SKU number. This value is provided on a board-level label.

/sys/bus/platform/devices/MLNXBF04:00/sn

Defined on file sysfs-platform-mellanox-bootctl

The “sn” sysfs attribute holds the board’s serial number. This value is provided on a board-level label.

/sys/bus/platform/devices/MLNXBF04:00/uuid

Defined on file sysfs-platform-mellanox-bootctl

The “uuid” sysfs attribute holds the board’s UUID. This value is provided by the manufacturing team.

/sys/bus/platform/devices/VPC2004:*/camera_power

Defined on file sysfs-platform-ideapad-laptop

Control the power of camera module. 1 means on, 0 means off.

/sys/bus/platform/devices/VPC2004:*/conservation_mode

Defined on file sysfs-platform-ideapad-laptop

Controls whether the conservation mode is enabled or not. This feature limits the maximum battery charge percentage to around 50-60% in order to prolong the lifetime of the battery.

/sys/bus/platform/devices/VPC2004:*/fan_mode

Defined on file sysfs-platform-ideapad-laptop

Change fan mode There are four available modes:

  • 0 -> Super Silent Mode

  • 1 -> Standard Mode

  • 2 -> Dust Cleaning

  • 4 -> Efficient Thermal Dissipation Mode

/sys/bus/platform/devices/VPC2004:*/fn_lock

Defined on file sysfs-platform-ideapad-laptop

Control fn-lock mode.

  • 1 -> Switched On

  • 0 -> Switched Off

For example:

# echo "0" >  \
/sys/bus/pci/devices/0000:00:1f.0/PNP0C09:00/VPC2004:00/fn_lock

/sys/bus/platform/devices/VPC2004:*/touchpad

Defined on file sysfs-platform-ideapad-laptop

Control touchpad mode.

  • 1 -> Switched On

  • 0 -> Switched Off

/sys/bus/platform/devices/VPC2004:*/usb_charging

Defined on file sysfs-platform-ideapad-laptop

Controls whether the “always on USB charging” feature is enabled or not. This feature enables charging USB devices even if the computer is not turned on.

/sys/bus/platform/devices/[..]/fsi-master-gpio/external_mode

Defined on file sysfs-driver-fsi-master-gpio

Controls access arbitration for GPIO-based FSI master. A value of 0 (the default) sets normal mode, where the driver performs FSI bus transactions, 1 sets external mode, where the FSI bus is driven externally (for example, by a debug device).

/sys/bus/platform/devices/ci_hdrc.0/inputs/a_bus_drop

Defined on file sysfs-platform-chipidea-usb-otg

Can be set and read The a_bus_drop(A-device bus drop) input is 1 when the application running on the A-device wants to power down the bus, and is 0 otherwise, When a_bus_drop is 1, then the a_bus_req shall be 0.

Valid values are “1” and “0”.

Reading: returns 1 if the bus is off(vbus is turned off) by

A-device, otherwise 0.

/sys/bus/platform/devices/ci_hdrc.0/inputs/a_bus_req

Defined on file sysfs-platform-chipidea-usb-otg

Can be set and read. Set a_bus_req(A-device bus request) input to be 1 if the application running on the A-device wants to use the bus, and to be 0 when the application no longer wants to use the bus(or wants to work as peripheral). a_bus_req can also be set to 1 by kernel in response to remote wakeup signaling from the B-device, the A-device should decide to resume the bus.

Valid values are “1” and “0”.

Reading: returns 1 if the application running on the A-device is using the bus as host role, otherwise 0.

/sys/bus/platform/devices/ci_hdrc.0/inputs/a_clr_err

Defined on file sysfs-platform-chipidea-usb-otg

Only can be set. The a_clr_err(A-device Vbus error clear) input is used to clear vbus error, then A-device will power down the bus.

Valid value is “1”

/sys/bus/platform/devices/ci_hdrc.0/inputs/b_bus_req

Defined on file sysfs-platform-chipidea-usb-otg

Can be set and read. The b_bus_req(B-device bus request) input is 1 during the time that the application running on the B-device wants to use the bus as host, and is 0 when the application no longer wants to work as host and decides to switch back to be peripheral.

Valid values are “1” and “0”.

Reading: returns if the application running on the B device is using the bus as host role, otherwise 0.

/sys/bus/platform/devices/ci_hdrc.0/role

Defined on file sysfs-platform-chipidea-usb2

When read, it returns string “gadget” or “host”, indicating the current controller role.

It will do role switch when “gadget” or “host” is written to it. Only controller at dual-role configuration supports writing.

/sys/bus/platform/devices/dfl-fme.0/bitstream_id

Defined on file sysfs-platform-dfl-fme

Read-only. It returns Bitstream (static FPGA region) identifier number, which includes the detailed version and other information of this static FPGA region.

/sys/bus/platform/devices/dfl-fme.0/bitstream_metadata

Defined on file sysfs-platform-dfl-fme

Read-only. It returns Bitstream (static FPGA region) meta data, which includes the synthesis date, seed and other information of this static FPGA region.

/sys/bus/platform/devices/dfl-fme.0/cache_size

Defined on file sysfs-platform-dfl-fme

Read-only. It returns cache size of this FPGA device.

/sys/bus/platform/devices/dfl-fme.0/errors/catfatal_errors

Defined on file sysfs-platform-dfl-fme

Read-only. It returns catastrophic and fatal errors detected.

/sys/bus/platform/devices/dfl-fme.0/errors/first_error

Defined on file sysfs-platform-dfl-fme

Read-only. Read this file to get the first error detected by hardware.

/sys/bus/platform/devices/dfl-fme.0/errors/fme_errors

Defined on file sysfs-platform-dfl-fme

Read-Write. Read this file to get errors detected on FME. Write this file to clear errors logged in fme_errors. Write fails with -EINVAL if input parsing fails or input error code doesn’t match.

/sys/bus/platform/devices/dfl-fme.0/errors/inject_errors

Defined on file sysfs-platform-dfl-fme

Read-Write. Read this file to check errors injected. Write this file to inject errors for testing purpose. Write fails with -EINVAL if input parsing fails or input inject error code isn’t supported.

/sys/bus/platform/devices/dfl-fme.0/errors/next_error

Defined on file sysfs-platform-dfl-fme

Read-only. Read this file to get the second error detected by hardware.

/sys/bus/platform/devices/dfl-fme.0/errors/nonfatal_errors

Defined on file sysfs-platform-dfl-fme

Read-only. It returns non-fatal errors detected.

/sys/bus/platform/devices/dfl-fme.0/errors/pcie0_errors

Defined on file sysfs-platform-dfl-fme

Read-Write. Read this file for errors detected on pcie0 link. Write this file to clear errors logged in pcie0_errors. Write fails with -EINVAL if input parsing fails or input error code doesn’t match.

/sys/bus/platform/devices/dfl-fme.0/errors/pcie1_errors

Defined on file sysfs-platform-dfl-fme

Read-Write. Read this file for errors detected on pcie1 link. Write this file to clear errors logged in pcie1_errors. Write fails with -EINVAL if input parsing fails or input error code doesn’t match.

/sys/bus/platform/devices/dfl-fme.0/fabric_version

Defined on file sysfs-platform-dfl-fme

Read-only. It returns fabric version of this FPGA device. Userspace applications need this information to select best data channels per different fabric design.

/sys/bus/platform/devices/dfl-fme.0/hwmon/hwmonX/name

Defined on file sysfs-platform-dfl-fme

Read-Only. Read this file to get the name of hwmon device, it supports values:

‘dfl_fme_thermal’

thermal hwmon device name

‘dfl_fme_power’

power hwmon device name

/sys/bus/platform/devices/dfl-fme.0/hwmon/hwmonX/power1_crit

Defined on file sysfs-platform-dfl-fme

Read-Write. Read this file to get current hardware power threshold2 in uW. If power consumption rises at or above this threshold, hardware starts 90% throttling. Write this file to set current hardware power threshold2 in uW. As hardware only accepts values in Watts, so input value will be round down per Watts (< 1 watts part will be discarded) and clamped within the range from 0 to 127 Watts. Write fails with -EINVAL if input parsing fails.

/sys/bus/platform/devices/dfl-fme.0/hwmon/hwmonX/power1_crit_alarm

Defined on file sysfs-platform-dfl-fme

Read-only. It returns 1 if power consumption is currently at or above hardware threshold2 (see ‘power1_crit’), otherwise 0.

/sys/bus/platform/devices/dfl-fme.0/hwmon/hwmonX/power1_fpga_limit

Defined on file sysfs-platform-dfl-fme

Read-Only. It returns power limit for FPGA in uW.

/sys/bus/platform/devices/dfl-fme.0/hwmon/hwmonX/power1_input

Defined on file sysfs-platform-dfl-fme

Read-Only. It returns current FPGA power consumption in uW.

/sys/bus/platform/devices/dfl-fme.0/hwmon/hwmonX/power1_ltr

Defined on file sysfs-platform-dfl-fme

Read-only. Read this file to get current Latency Tolerance Reporting (ltr) value. It returns 1 if all Accelerated Function Units (AFUs) can tolerate latency >= 40us for memory access or 0 if any AFU is latency sensitive (< 40us).

/sys/bus/platform/devices/dfl-fme.0/hwmon/hwmonX/power1_max

Defined on file sysfs-platform-dfl-fme

Read-Write. Read this file to get current hardware power threshold1 in uW. If power consumption rises at or above this threshold, hardware starts 50% throttling. Write this file to set current hardware power threshold1 in uW. As hardware only accepts values in Watts, so input value will be round down per Watts (< 1 watts part will be discarded) and clamped within the range from 0 to 127 Watts. Write fails with -EINVAL if input parsing fails.

/sys/bus/platform/devices/dfl-fme.0/hwmon/hwmonX/power1_max_alarm

Defined on file sysfs-platform-dfl-fme

Read-only. It returns 1 if power consumption is currently at or above hardware threshold1 (see ‘power1_max’), otherwise 0.

/sys/bus/platform/devices/dfl-fme.0/hwmon/hwmonX/power1_xeon_limit

Defined on file sysfs-platform-dfl-fme

Read-Only. It returns power limit for XEON in uW.

/sys/bus/platform/devices/dfl-fme.0/hwmon/hwmonX/temp1_crit

Defined on file sysfs-platform-dfl-fme

Read-Only. It returns hardware threshold2 temperature in millidegrees Celsius. If temperature rises at or above this threshold, hardware starts 100% throttling.

/sys/bus/platform/devices/dfl-fme.0/hwmon/hwmonX/temp1_crit_alarm

Defined on file sysfs-platform-dfl-fme

Read-only. It returns 1 if temperature is currently at or above hardware threshold2 (see ‘temp1_crit’), otherwise 0.

/sys/bus/platform/devices/dfl-fme.0/hwmon/hwmonX/temp1_emergency

Defined on file sysfs-platform-dfl-fme

Read-Only. It returns hardware trip threshold temperature in millidegrees Celsius. If temperature rises at or above this threshold, a fatal event will be triggered to board management controller (BMC) to shutdown FPGA.

/sys/bus/platform/devices/dfl-fme.0/hwmon/hwmonX/temp1_input

Defined on file sysfs-platform-dfl-fme

Read-Only. It returns FPGA device temperature in millidegrees Celsius.

/sys/bus/platform/devices/dfl-fme.0/hwmon/hwmonX/temp1_max

Defined on file sysfs-platform-dfl-fme

Read-Only. It returns hardware threshold1 temperature in millidegrees Celsius. If temperature rises at or above this threshold, hardware starts 50% or 90% throttling (see ‘temp1_max_policy’).

/sys/bus/platform/devices/dfl-fme.0/hwmon/hwmonX/temp1_max_alarm

Defined on file sysfs-platform-dfl-fme

Read-only. It returns 1 if temperature is currently at or above hardware threshold1 (see ‘temp1_max’), otherwise 0.

/sys/bus/platform/devices/dfl-fme.0/hwmon/hwmonX/temp1_max_policy

Defined on file sysfs-platform-dfl-fme

Read-Only. Read this file to get the policy of hardware threshold1 (see ‘temp1_max’). It only supports two values (policies):

0

AP2 state (90% throttling)

1

AP1 state (50% throttling)

/sys/bus/platform/devices/dfl-fme.0/ports_num

Defined on file sysfs-platform-dfl-fme

Read-only. One DFL FPGA device may have more than 1 port/Accelerator Function Unit (AFU). It returns the number of ports on the FPGA device when read it.

/sys/bus/platform/devices/dfl-fme.0/socket_id

Defined on file sysfs-platform-dfl-fme

Read-only. It returns socket_id to indicate which socket this FPGA belongs to, only valid for integrated solution. User only needs this information, in case standard numa node can’t provide correct information.

/sys/bus/platform/devices/dfl-port.0/afu_id

Defined on file sysfs-platform-dfl-port

Read-only. User can program different PR bitstreams to FPGA Accelerator Function Unit (AFU) for different functions. It returns uuid which could be used to identify which PR bitstream is programmed in this AFU.

/sys/bus/platform/devices/dfl-port.0/ap1_event

Defined on file sysfs-platform-dfl-port

Read-write. Read this file for AP1 (AFU Power State 1) event. It’s used to indicate transient AP1 state. Write 1 to this file to clear AP1 event.

/sys/bus/platform/devices/dfl-port.0/ap2_event

Defined on file sysfs-platform-dfl-port

Read-write. Read this file for AP2 (AFU Power State 2) event. It’s used to indicate transient AP2 state. Write 1 to this file to clear AP2 event.

/sys/bus/platform/devices/dfl-port.0/errors/errors

Defined on file sysfs-platform-dfl-port

Read-Write. Read this file to get errors detected on port and Accelerated Function Unit (AFU). Write error code to this file to clear errors. Write fails with -EINVAL if input parsing fails or input error code doesn’t match. Write fails with -EBUSY or -ETIMEDOUT if error can’t be cleared as hardware in low power state (-EBUSY) or not respoding (-ETIMEDOUT).

/sys/bus/platform/devices/dfl-port.0/errors/first_error

Defined on file sysfs-platform-dfl-port

Read-only. Read this file to get the first error detected by hardware.

/sys/bus/platform/devices/dfl-port.0/errors/first_malformed_req

Defined on file sysfs-platform-dfl-port

Read-only. Read this file to get the first malformed request captured by hardware.

/sys/bus/platform/devices/dfl-port.0/id

Defined on file sysfs-platform-dfl-port

Read-only. It returns id of this port. One DFL FPGA device may have more than one port. Userspace could use this id to distinguish different ports under same FPGA device.

/sys/bus/platform/devices/dfl-port.0/ltr

Defined on file sysfs-platform-dfl-port

Read-write. Read or set AFU latency tolerance reporting value. Set ltr to 1 if the AFU can tolerate latency >= 40us or set it to 0 if it is latency sensitive.

/sys/bus/platform/devices/dfl-port.0/power_state

Defined on file sysfs-platform-dfl-port

Read-only. It reports the APx (AFU Power) state, different APx means different throttling level. When reading this file, it returns “0” - Normal / “1” - AP1 / “2” - AP2 / “6” - AP6.

/sys/bus/platform/devices/dfl-port.0/userclk_freqcmd

Defined on file sysfs-platform-dfl-port

Write-only. User writes command to this interface to set userclock to AFU.

/sys/bus/platform/devices/dfl-port.0/userclk_freqcntrcmd

Defined on file sysfs-platform-dfl-port

Write-only. User writes command to this interface to set userclock counter.

/sys/bus/platform/devices/dfl-port.0/userclk_freqcntrsts

Defined on file sysfs-platform-dfl-port

Read-only. Read this file to get the status of issued command to userclck_freqcntrcmd.

/sys/bus/platform/devices/dfl-port.0/userclk_freqsts

Defined on file sysfs-platform-dfl-port

Read-only. Read this file to get the status of issued command to userclck_freqcmd.

/sys/bus/platform/devices/occ-hwmon.X/ffdc

Defined on file sysfs-bus-platform-devices-occ-hwmon

Contains the First Failure Data Capture from the SBEFIFO hardware, if there is any from a previous transfer. Otherwise, the file is empty. The data is cleared when it’s been completely read by a user. As the name suggests, only the data from the first error is saved, until it’s cleared upon read. The OCC hwmon driver, running on a Baseboard Management Controller (BMC), communicates with POWER9 and up processors over the Self-Boot Engine (SBE) FIFO. In many error conditions, the SBEFIFO will return error data indicating the type of error and system state, etc.

/sys/bus/platform/devices/smpro-errmon.*/[error|warn]_[smpro|pmpro]

Defined on file sysfs-bus-platform-devices-ampere-smpro

(RO) Contains the internal firmware error/warning printed as hex format.

The detail of each sysfs entries is as below:

Error

Sysfs entry

Description

SMpro error

/sys/bus/platform/devices/smpro-errmon.*/error_smpro

system has SMpro error

SMpro warning

/sys/bus/platform/devices/smpro-errmon.*/warn_smpro

system has SMpro warning

PMpro error

/sys/bus/platform/devices/smpro-errmon.*/error_pmpro

system has PMpro error

PMpro warning

/sys/bus/platform/devices/smpro-errmon.*/warn_pmpro

system has PMpro warning

For details, see section 5.10 RAS Internal Error Register Definitions, Altra Family Soc BMC Interface Specification.

/sys/bus/platform/devices/smpro-errmon.*/error_[core|mem|pcie|other]_[ce|ue]

Defined on file sysfs-bus-platform-devices-ampere-smpro

(RO) Contains the 48-byte Ampere (Vendor-Specific) Error Record printed in hex format according to the table below:

Offset

Field

Size (byte)

Description

00

Error Type

1

See the table below for details

01

Subtype

1

See the table below for details

02

Instance

2

See the table below for details

04

Error status

4

See ARM RAS specification for details

08

Error Address

8

See ARM RAS specification for details

16

Error Misc 0

8

See ARM RAS specification for details

24

Error Misc 1

8

See ARM RAS specification for details

32

Error Misc 2

8

See ARM RAS specification for details

40

Error Misc 3

8

See ARM RAS specification for details

The table below defines the value of error types, their subtype, subcomponent and instance:

Error Group

Error Type

Sub type

Sub component

Instance

CPM (core)

0

0

Snoop-Logic

CPM #

CPM (core)

0

2

Armv8 Core 1

CPM #

MCU (mem)

1

1

ERR1

MCU # | SLOT << 11

MCU (mem)

1

2

ERR2

MCU # | SLOT << 11

MCU (mem)

1

3

ERR3

MCU #

MCU (mem)

1

4

ERR4

MCU #

MCU (mem)

1

5

ERR5

MCU #

MCU (mem)

1

6

ERR6

MCU #

MCU (mem)

1

7

Link Error

MCU #

Mesh (other)

2

0

Cross Point

X | (Y << 5) | NS <<11

Mesh (other)

2

1

Home Node(IO)

X | (Y << 5) | NS <<11

Mesh (other)

2

2

Home Node(Mem)

X | (Y << 5) | NS <<11 | device<<12

Mesh (other)

2

4

CCIX Node

X | (Y << 5) | NS <<11

2P Link (other)

3

0

N/A

Altra 2P Link #

GIC (other)

5

0

ERR0

0

GIC (other)

5

1

ERR1

0

GIC (other)

5

2

ERR2

0

GIC (other)

5

3

ERR3

0

GIC (other)

5

4

ERR4

0

GIC (other)

5

5

ERR5

0

GIC (other)

5

6

ERR6

0

GIC (other)

5

7

ERR7

0

GIC (other)

5

8

ERR8

0

GIC (other)

5

9

ERR9

0

GIC (other)

5

10

ERR10

0

GIC (other)

5

11

ERR11

0

GIC (other)

5

12

ERR12

0

GIC (other)

5

13-21

ERR13

RC # + 1

SMMU (other)

6

TCU

100

RC #

SMMU (other)

6

TBU0

0

RC #

SMMU (other)

6

TBU1

1

RC #

SMMU (other)

6

TBU2

2

RC #

SMMU (other)

6

TBU3

3

RC #

SMMU (other)

6

TBU4

4

RC #

SMMU (other)

6

TBU5

5

RC #

SMMU (other)

6

TBU6

6

RC #

SMMU (other)

6

TBU7

7

RC #

SMMU (other)

6

TBU8

8

RC #

SMMU (other)

6

TBU9

9

RC #

PCIe AER (pcie)

7

Root

0

RC #

PCIe AER (pcie)

7

Device

1

RC #

PCIe RC (pcie)

8

RCA HB

0

RC #

PCIe RC (pcie)

8

RCB HB

1

RC #

PCIe RC (pcie)

8

RASDP

8

RC #

OCM (other)

9

ERR0

0

0

OCM (other)

9

ERR1

1

0

OCM (other)

9

ERR2

2

0

SMpro (other)

10

ERR0

0

0

SMpro (other)

10

ERR1

1

0

SMpro (other)

10

MPA_ERR

2

0

PMpro (other)

11

ERR0

0

0

PMpro (other)

11

ERR1

1

0

PMpro (other)

11

MPA_ERR

2

0

Example:

# cat error_other_ue
880807001e004010401040101500000001004010401040100c0000000000000000000000000000000000000000000000

The detail of each sysfs entries is as below:

Error

Sysfs entry

Description (when triggered)

Core’s CE

/sys/bus/platform/devices/smpro-errmon.*/error_core_ce

Core has CE error

Core’s UE

/sys/bus/platform/devices/smpro-errmon.*/error_core_ue

Core has UE error

Memory’s CE

/sys/bus/platform/devices/smpro-errmon.*/error_mem_ce

Memory has CE error

Memory’s UE

/sys/bus/platform/devices/smpro-errmon.*/error_mem_ue

Memory has UE error

PCIe’s CE

/sys/bus/platform/devices/smpro-errmon.*/error_pcie_ce

any PCIe controller has CE error

PCIe’s UE

/sys/bus/platform/devices/smpro-errmon.*/error_pcie_ue

any PCIe controller has UE error

Other’s CE

/sys/bus/platform/devices/smpro-errmon.*/error_other_ce

any other CE error

Other’s UE

/sys/bus/platform/devices/smpro-errmon.*/error_other_ue

any other UE error

UE: Uncorrect-able Error CE: Correct-able Error

For details, see section 3.3 Ampere (Vendor-Specific) Error Record Formats, Altra Family RAS Supplement.

/sys/bus/platform/devices/smpro-errmon.*/event_[vrd_warn_fault|vrd_hot|dimm_hot|dimm_2x_refresh]

Defined on file sysfs-bus-platform-devices-ampere-smpro

(RO) Contains the detail information in case of VRD/DIMM warning/hot events in hex format as below:

AAAA

where:

  • AAAA: The event detail information data

The detail of each sysfs entries is as below:

Event

Sysfs entry

Description

VRD HOT

/sys/bus/platform/devices/smpro-errmon.*/event_vrd_hot

VRD Hot

VR Warn/Fault

/sys/bus/platform/devices/smpro-errmon.*/event_vrd_warn_fault

VR Warning or Fault

DIMM HOT

/sys/bus/platform/devices/smpro-errmon.*/event_dimm_hot

DIMM Hot

DIMM 2X REFRESH RATE

/sys/bus/platform/devices/smpro-errmon.*/event_dimm_2x_refresh

DIMM 2x refresh rate event in high temp

For more details, see section 5.7 GPI Status Registers and 5.9 Memory Error Register Definitions, Altra Family Soc BMC Interface Specification.

/sys/bus/platform/devices/smpro-errmon.*/event_dimm[0-15]_syndrome

Defined on file sysfs-bus-platform-devices-ampere-smpro

(RO) The sysfs returns the 2-byte DIMM failure syndrome data for slot 0-15 if it failed to initialize.

For more details, see section 5.11 Boot Stage Register Definitions, Altra Family Soc BMC Interface Specification.

/sys/bus/platform/devices/smpro-errmon.*/overflow_[core|mem|pcie|other]_[ce|ue]

Defined on file sysfs-bus-platform-devices-ampere-smpro

(RO) Return the overflow status of each type HW error reported:

  • 0 : No overflow

  • 1 : There is an overflow and the oldest HW errors are dropped

The detail of each sysfs entries is as below:

Overflow

Sysfs entry

Description

Core’s CE

/sys/bus/platform/devices/smpro-errmon.*/overflow_core_ce

Core CE error overflow

Core’s UE

/sys/bus/platform/devices/smpro-errmon.*/overflow_core_ue

Core UE error overflow

Memory’s CE

/sys/bus/platform/devices/smpro-errmon.*/overflow_mem_ce

Memory CE error overflow

Memory’s UE

/sys/bus/platform/devices/smpro-errmon.*/overflow_mem_ue

Memory UE error overflow

PCIe’s CE

/sys/bus/platform/devices/smpro-errmon.*/overflow_pcie_ce

any PCIe controller CE error overflow

PCIe’s UE

/sys/bus/platform/devices/smpro-errmon.*/overflow_pcie_ue

any PCIe controller UE error overflow

Other’s CE

/sys/bus/platform/devices/smpro-errmon.*/overflow_other_ce

any other CE error overflow