Kernel driver lm25066

Supported chips:

Author: Guenter Roeck <>


This driver supports hardware monitoring for National Semiconductor / TI LM25056, LM25066, LM5064, and LM5066/LM5066I Power Management, Monitoring, Control, and Protection ICs.

The driver is a client driver to the core PMBus driver. Please see Documentation/hwmon/pmbus.rst 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 Documentation/i2c/instantiating-devices.rst for details.

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.

in1_label “vin”
in1_input Measured input voltage.
in1_average Average measured input voltage.
in1_min Minimum input voltage.
in1_max Maximum input voltage.
in1_min_alarm Input voltage low alarm.
in1_max_alarm Input voltage high alarm.
in2_label “vmon”
in2_input Measured voltage on VAUX pin
in2_min Minimum VAUX voltage (LM25056 only).
in2_max Maximum VAUX voltage (LM25056 only).
in2_min_alarm VAUX voltage low alarm (LM25056 only).
in2_max_alarm VAUX voltage high alarm (LM25056 only).
in3_label “vout1” Not supported on LM25056.
in3_input Measured output voltage.
in3_average Average measured output voltage.
in3_min Minimum output voltage.
in3_min_alarm Output voltage low alarm.
curr1_label “iin”
curr1_input Measured input current.
curr1_average Average measured input current.
curr1_max Maximum input current.
curr1_max_alarm Input current high alarm.
power1_label “pin”
power1_input Measured input power.
power1_average Average measured input power.
power1_max Maximum input power limit.
power1_alarm Input power alarm
power1_input_highest Historical maximum power.
power1_reset_history Write any value to reset maximum power history.
temp1_input Measured temperature.
temp1_max Maximum temperature.
temp1_crit Critical high temperature.
temp1_max_alarm Chip temperature high alarm.
temp1_crit_alarm Chip temperature critical high alarm.