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Neelesh Gupta24c1aa82014-07-08 14:38:38 +05301Kernel Driver IBMPOWERNV
2========================
3
4Supported systems:
5 * Any recent IBM P servers based on POWERNV platform
6
7Author: Neelesh Gupta
8
9Description
10-----------
11
12This driver implements reading the platform sensors data like temperature/fan/
13voltage/power for 'POWERNV' platform.
14
15The driver uses the platform device infrastructure. It probes the device tree
16for 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
18sensor type and its attribute data.
19
20All the nodes in the DT appear under "/ibm,opal/sensors" and each valid node in
21the DT maps to an attribute file in 'sysfs'. The node exports unique 'sensor-id'
22which the driver uses to make an OPAL call to the firmware.
23
24Usage notes
25-----------
26The driver is built statically with the kernel by enabling the config
27CONFIG_SENSORS_IBMPOWERNV. It can also be built as module 'ibmpowernv'.
28
29Sysfs attributes
30----------------
31
32fanX_input Measured RPM value.
33fanX_min Threshold RPM for alert generation.
34fanX_fault 0: No fail condition
35 1: Failing fan
36tempX_input Measured ambient temperature.
37tempX_max Threshold ambient temperature for alert generation.
38inX_input Measured power supply voltage
39inX_fault 0: No fail condition.
40 1: Failing power supply.
41power1_input System power consumption (microWatt)