Kernel driver bel-pfe

Supported chips:

Author: Tao Ren <>


This driver supports hardware monitoring for below power supply devices which support PMBus Protocol:

  • BEL PFE1100

    1100 Watt AC to DC power-factor-corrected (PFC) power supply. PMBus Communication Manual is not publicly available.

  • BEL PFE3000

    3000 Watt AC/DC power-factor-corrected (PFC) and DC-DC power supply. PMBus Communication Manual is not publicly available.

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.

Example: the following will load the driver for an PFE3000 at address 0x20 on I2C bus #1:

$ modprobe bel-pfe
$ echo pfe3000 0x20 > /sys/bus/i2c/devices/i2c-1/new_device

Platform data support

The driver supports standard PMBus driver platform data.

Sysfs entries

curr1_label “iin”
curr1_input Measured input current
curr1_max Input current max value
curr1_max_alarm Input current max alarm
curr[2-3]_label “iout[1-2]”
curr[2-3]_input Measured output current
curr[2-3]_max Output current max value
curr[2-3]_max_alarm Output current max alarm
fan[1-2]_input Fan 1 and 2 speed in RPM
fan1_target Set fan speed reference for both fans
in1_label “vin”
in1_input Measured input voltage
in1_crit Input voltage critical max value
in1_crit_alarm Input voltage critical max alarm
in1_lcrit Input voltage critical min value
in1_lcrit_alarm Input voltage critical min alarm
in1_max Input voltage max value
in1_max_alarm Input voltage max alarm
in2_label “vcap”
in2_input Hold up capacitor voltage
in[3-8]_label “vout[1-3,5-7]”
in[3-8]_input Measured output voltage
in[3-4]_alarm vout[1-2] output voltage alarm
power[1-2]_label “pin[1-2]”
power[1-2]_input Measured input power
power[1-2]_alarm Input power high alarm
power[3-4]_label “pout[1-2]”
power[3-4]_input Measured output power
temp[1-3]_input Measured temperature
temp[1-3]_alarm Temperature alarm


  • curr3, fan2, vout[2-7], vcap, pin2, pout2 and temp3 attributes only exist for PFE3000.