blob: 8826ba29db3668e11d5eaabd2c4ecc7fa78257c8 [file] [log] [blame]
Kernel Driver IBMPOWERNV
Supported systems:
* Any recent IBM P servers based on POWERNV platform
Author: Neelesh Gupta
This driver implements reading the platform sensors data like temperature/fan/
voltage/power for 'POWERNV' platform.
The driver uses the platform device infrastructure. It probes the device tree
for sensor devices during the __init phase and registers them with the 'hwmon'.
'hwmon' populates the 'sysfs' tree having attribute files, each for a given
sensor type and its attribute data.
All the nodes in the DT appear under "/ibm,opal/sensors" and each valid node in
the DT maps to an attribute file in 'sysfs'. The node exports unique 'sensor-id'
which the driver uses to make an OPAL call to the firmware.
Usage notes
The driver is built statically with the kernel by enabling the config
CONFIG_SENSORS_IBMPOWERNV. It can also be built as module 'ibmpowernv'.
Sysfs attributes
fanX_input Measured RPM value.
fanX_min Threshold RPM for alert generation.
fanX_fault 0: No fail condition
1: Failing fan
tempX_input Measured ambient temperature.
tempX_max Threshold ambient temperature for alert generation.
inX_input Measured power supply voltage
inX_fault 0: No fail condition.
1: Failing power supply.
power1_input System power consumption (microWatt)