Commit | Line | Data |
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24c1aa85 NG |
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) |