| Kernel Driver IBMPOWERNV |
| ======================== |
| |
| Supported systems: |
| * Any recent IBM P servers based on POWERNV platform |
| |
| Author: Neelesh Gupta |
| |
| Description |
| ----------- |
| |
| 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) |
