e72e9355e3
git: https://android.googlesource.com/kernel/common branch: android-4.9 commit: 03fcc2fe71308c2d164b4e6cbfc738c63e670444
42 lines
1.3 KiB
Plaintext
42 lines
1.3 KiB
Plaintext
Kernel Driver IBMPOWERNV
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========================
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Supported systems:
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* Any recent IBM P servers based on POWERNV platform
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Author: Neelesh Gupta
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Description
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-----------
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This driver implements reading the platform sensors data like temperature/fan/
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voltage/power for 'POWERNV' platform.
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The driver uses the platform device infrastructure. It probes the device tree
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for sensor devices during the __init phase and registers them with the 'hwmon'.
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'hwmon' populates the 'sysfs' tree having attribute files, each for a given
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sensor type and its attribute data.
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All the nodes in the DT appear under "/ibm,opal/sensors" and each valid node in
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the DT maps to an attribute file in 'sysfs'. The node exports unique 'sensor-id'
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which the driver uses to make an OPAL call to the firmware.
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Usage notes
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-----------
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The driver is built statically with the kernel by enabling the config
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CONFIG_SENSORS_IBMPOWERNV. It can also be built as module 'ibmpowernv'.
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Sysfs attributes
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----------------
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fanX_input Measured RPM value.
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fanX_min Threshold RPM for alert generation.
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fanX_fault 0: No fail condition
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1: Failing fan
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tempX_input Measured ambient temperature.
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tempX_max Threshold ambient temperature for alert generation.
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inX_input Measured power supply voltage
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inX_fault 0: No fail condition.
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1: Failing power supply.
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power1_input System power consumption (microWatt)
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