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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tempX_highest Historical maximum temperature
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tempX_lowest Historical minimum temperature
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tempX_enable Enable/disable all temperature sensors belonging to the
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sub-group. In POWER9, this attribute corresponds to
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each OCC. Using this attribute each OCC can be asked to
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disable/enable all of its temperature sensors.
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1: Enable
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0: Disable
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inX_input Measured power supply voltage (millivolt)
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inX_fault 0: No fail condition.
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1: Failing power supply.
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inX_highest Historical maximum voltage
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inX_lowest Historical minimum voltage
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inX_enable Enable/disable all voltage sensors belonging to the
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sub-group. In POWER9, this attribute corresponds to
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each OCC. Using this attribute each OCC can be asked to
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disable/enable all of its voltage sensors.
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1: Enable
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0: Disable
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powerX_input Power consumption (microWatt)
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powerX_input_highest Historical maximum power
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powerX_input_lowest Historical minimum power
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powerX_enable Enable/disable all power sensors belonging to the
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sub-group. In POWER9, this attribute corresponds to
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each OCC. Using this attribute each OCC can be asked to
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disable/enable all of its power sensors.
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1: Enable
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0: Disable
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currX_input Measured current (milliampere)
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currX_highest Historical maximum current
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currX_lowest Historical minimum current
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currX_enable Enable/disable all current sensors belonging to the
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sub-group. In POWER9, this attribute corresponds to
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each OCC. Using this attribute each OCC can be asked to
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disable/enable all of its current sensors.
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1: Enable
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0: Disable
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energyX_input Cumulative energy (microJoule)
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