Documentation/hwmon/ibmpowernv

   1 Kernel Driver IBMPOWERNV
   2 ========================
   3
   4 Supported systems:
   5   * Any recent IBM P servers based on POWERNV platform
   6
   7 Author: Neelesh Gupta
   8
   9 Description
  10 -----------
  11
  12 This driver implements reading the platform sensors data like temperature/fan/
  13 voltage/power for 'POWERNV' platform.
  14
  15 The driver uses the platform device infrastructure. It probes the device tree
  16 for sensor devices during the __init phase and registers them with the 'hwmon'.
  17 'hwmon' populates the 'sysfs' tree having attribute files, each for a given
  18 sensor type and its attribute data.
  19
  20 All the nodes in the DT appear under "/ibm,opal/sensors" and each valid node in
  21 the DT maps to an attribute file in 'sysfs'. The node exports unique 'sensor-id'
  22 which the driver uses to make an OPAL call to the firmware.
  23
  24 Usage notes
  25 -----------
  26 The driver is built statically with the kernel by enabling the config
  27 CONFIG_SENSORS_IBMPOWERNV. It can also be built as module 'ibmpowernv'.
  28
  29 Sysfs attributes
  30 ----------------
  31
  32 fanX_input              Measured RPM value.
  33 fanX_min                Threshold RPM for alert generation.
  34 fanX_fault              0: No fail condition
  35                         1: Failing fan
  36 tempX_input             Measured ambient temperature.
  37 tempX_max               Threshold ambient temperature for alert generation.
  38 inX_input               Measured power supply voltage
  39 inX_fault               0: No fail condition.
  40                         1: Failing power supply.
  41 power1_input            System power consumption (microWatt)