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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) | ||