| Neelesh Gupta | 24c1aa8 | 2014-07-08 14:38:38 +0530 | [diff] [blame] | 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) |