Kernel driver max34440

Supported chips:

Author: Guenter Roeck <linux@roeck-us.net>

Description

This driver supports hardware monitoring for Maxim MAX34440 PMBus 6-Channel Power-Supply Manager, MAX34441 PMBus 5-Channel Power-Supply Manager and Intelligent Fan Controller, and MAX34446 PMBus Power-Supply Data Logger. It also supports the MAX34451, MAX34460, and MAX34461 PMBus Voltage Monitor & Sequencers. The MAX34451 supports monitoring voltage or current of 12 channels based on GIN pins. The MAX34460 supports 12 voltage channels, and the MAX34461 supports 16 voltage channels.

The driver is a client driver to the core PMBus driver. Please see Kernel driver pmbus for details on PMBus client drivers.

Usage Notes

This driver does not auto-detect devices. You will have to instantiate the devices explicitly. Please see How to instantiate I2C devices for details.

For MAX34446, the value of the currX_crit attribute determines if current or voltage measurement is enabled for a given channel. Voltage measurement is enabled if currX_crit is set to 0; current measurement is enabled if the attribute is set to a positive value. Power measurement is only enabled if channel 1 (3) is configured for voltage measurement, and channel 2 (4) is configured for current measurement.

Platform data support

The driver supports standard PMBus driver platform data.

Sysfs entries

The following attributes are supported. Limits are read-write; all other attributes are read-only.

In

in[1-6]_label

“vout[1-6]”.

in[1-6]_input

Measured voltage. From READ_VOUT register.

in[1-6]_min

Minimum Voltage. From VOUT_UV_WARN_LIMIT register.

in[1-6]_max

Maximum voltage. From VOUT_OV_WARN_LIMIT register.

in[1-6]_lcrit

Critical minimum Voltage. VOUT_UV_FAULT_LIMIT register.

in[1-6]_crit

Critical maximum voltage. From VOUT_OV_FAULT_LIMIT register.

in[1-6]_min_alarm

Voltage low alarm. From VOLTAGE_UV_WARNING status.

in[1-6]_max_alarm

Voltage high alarm. From VOLTAGE_OV_WARNING status.

in[1-6]_lcrit_alarm

Voltage critical low alarm. From VOLTAGE_UV_FAULT status.

in[1-6]_crit_alarm

Voltage critical high alarm. From VOLTAGE_OV_FAULT status.

in[1-6]_lowest

Historical minimum voltage.

in[1-6]_highest

Historical maximum voltage.

in[1-6]_reset_history

Write any value to reset history.

Note

MAX34446 only supports in[1-4].

Curr

curr[1-6]_label

“iout[1-6]”.

curr[1-6]_input

Measured current. From READ_IOUT register.

curr[1-6]_max

Maximum current. From IOUT_OC_WARN_LIMIT register.

curr[1-6]_crit

Critical maximum current. From IOUT_OC_FAULT_LIMIT register.

curr[1-6]_max_alarm

Current high alarm. From IOUT_OC_WARNING status.

curr[1-6]_crit_alarm

Current critical high alarm. From IOUT_OC_FAULT status.

curr[1-4]_average

Historical average current (MAX34446/34451 only).

curr[1-6]_highest

Historical maximum current.

curr[1-6]_reset_history

Write any value to reset history.

Note

  • in6 and curr6 attributes only exist for MAX34440.

  • MAX34446 only supports curr[1-4].

Power

power[1,3]_label

“pout[1,3]”

power[1,3]_input

Measured power.

power[1,3]_average

Historical average power.

power[1,3]_highest

Historical maximum power.

Note

Power attributes only exist for MAX34446.

Temp

temp[1-8]_input

Measured temperatures. From READ_TEMPERATURE_1 register. temp1 is the chip’s internal temperature. temp2..temp5 are remote I2C temperature sensors. For MAX34441, temp6 is a remote thermal-diode sensor. For MAX34440, temp6..8 are remote I2C temperature sensors.

temp[1-8]_max

Maximum temperature. From OT_WARN_LIMIT register.

temp[1-8]_crit

Critical high temperature. From OT_FAULT_LIMIT register.

temp[1-8]_max_alarm

Temperature high alarm.

temp[1-8]_crit_alarm

Temperature critical high alarm.

temp[1-8]_average

Historical average temperature (MAX34446 only).

temp[1-8]_highest

Historical maximum temperature.

temp[1-8]_reset_history

Write any value to reset history.

Note

  • temp7 and temp8 attributes only exist for MAX34440.

  • MAX34446 only supports temp[1-3].

Note

  • MAX34451 supports attribute groups in[1-16] (or curr[1-16] based on input pins) and temp[1-5].

  • MAX34460 supports attribute groups in[1-12] and temp[1-5].

  • MAX34461 supports attribute groups in[1-16] and temp[1-5].