Kernel driver max15301

Supported chips:

Author: Erik Rosen <>


This driver supports hardware monitoring for Maxim MAX15301 controller chip and compatible modules.

The driver is a client driver to the core PMBus driver. Please see Kernel driver pmbus and Documentation.hwmon/pmbus-core 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.

Platform data support

The driver supports standard PMBus driver platform data.

Module parameters


The controller requires a minimum interval between I2C bus accesses. The default interval is set to 100 us. For manual override, the driver provides a writeable module parameter, ‘delay’, which can be used to set the interval to a value between 0 and 65,535 microseconds.

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_lcrit Critical minimum input voltage.
in1_crit Critical maximum input voltage.
in1_lcrit_alarm Input voltage critical low alarm.
in1_crit_alarm Input voltage critical high alarm.
in2_label “vout1”
in2_input Measured output voltage.
in2_lcrit Critical minimum output Voltage.
in2_crit Critical maximum output voltage.
in2_lcrit_alarm Critical output voltage critical low alarm.
in2_crit_alarm Critical output voltage critical high alarm.
curr1_label “iout1”
curr1_input Measured output current.
curr1_crit Critical maximum output current.
curr1_crit_alarm Output current critical high alarm.
temp1_input Measured maximum temperature of all phases.
temp1_max Maximum temperature limit.
temp1_max_alarm High temperature alarm.
temp1_crit Critical maximum temperature limit.
temp1_crit_alarm Critical maximum temperature alarm.