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Diffstat (limited to 'Documentation/hwmon/ibmpowernv.rst')
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diff --git a/Documentation/hwmon/ibmpowernv.rst b/Documentation/hwmon/ibmpowernv.rst new file mode 100644 index 000000000..5d642bc3d --- /dev/null +++ b/Documentation/hwmon/ibmpowernv.rst @@ -0,0 +1,87 @@ +Kernel Driver IBMPOWERNV +======================== + +Supported systems: + + * Any recent IBM P servers based on POWERNV platform + +Author: Neelesh Gupta + +Description +----------- + +This driver implements reading the platform sensors data like temperature/fan/ +voltage/power for 'POWERNV' platform. + +The driver uses the platform device infrastructure. It probes the device tree +for sensor devices during the __init phase and registers them with the 'hwmon'. +'hwmon' populates the 'sysfs' tree having attribute files, each for a given +sensor type and its attribute data. + +All the nodes in the DT appear under "/ibm,opal/sensors" and each valid node in +the DT maps to an attribute file in 'sysfs'. The node exports unique 'sensor-id' +which the driver uses to make an OPAL call to the firmware. + +Usage notes +----------- +The driver is built statically with the kernel by enabling the config +CONFIG_SENSORS_IBMPOWERNV. It can also be built as module 'ibmpowernv'. + +Sysfs attributes +---------------- + +======================= ======================================================= +fanX_input Measured RPM value. +fanX_min Threshold RPM for alert generation. +fanX_fault - 0: No fail condition + - 1: Failing fan + +tempX_input Measured ambient temperature. +tempX_max Threshold ambient temperature for alert generation. +tempX_highest Historical maximum temperature +tempX_lowest Historical minimum temperature +tempX_enable Enable/disable all temperature sensors belonging to the + sub-group. In POWER9, this attribute corresponds to + each OCC. Using this attribute each OCC can be asked to + disable/enable all of its temperature sensors. + + - 1: Enable + - 0: Disable + +inX_input Measured power supply voltage (millivolt) +inX_fault - 0: No fail condition. + - 1: Failing power supply. +inX_highest Historical maximum voltage +inX_lowest Historical minimum voltage +inX_enable Enable/disable all voltage sensors belonging to the + sub-group. In POWER9, this attribute corresponds to + each OCC. Using this attribute each OCC can be asked to + disable/enable all of its voltage sensors. + + - 1: Enable + - 0: Disable + +powerX_input Power consumption (microWatt) +powerX_input_highest Historical maximum power +powerX_input_lowest Historical minimum power +powerX_enable Enable/disable all power sensors belonging to the + sub-group. In POWER9, this attribute corresponds to + each OCC. Using this attribute each OCC can be asked to + disable/enable all of its power sensors. + + - 1: Enable + - 0: Disable + +currX_input Measured current (milliampere) +currX_highest Historical maximum current +currX_lowest Historical minimum current +currX_enable Enable/disable all current sensors belonging to the + sub-group. In POWER9, this attribute corresponds to + each OCC. Using this attribute each OCC can be asked to + disable/enable all of its current sensors. + + - 1: Enable + - 0: Disable + +energyX_input Cumulative energy (microJoule) +======================= ======================================================= |