linux/Documentation/hwmon/ibmpowernv
Neelesh Gupta 24c1aa8587 hwmon: (powerpc/powernv) hwmon driver for power, fan rpm, voltage and temperature
This patch adds basic kernel support for reading power values, fan
speed rpm, voltage and temperature data on powernv platforms which
will be exported to user space through sysfs interface.

Test results:
-------------
[root@tul163p1 ~]# sensors
ibmpowernv-isa-0000
Adapter: ISA adapter
fan1:        5465 RPM  (min =    0 RPM)
fan2:        5152 RPM  (min =    0 RPM)
fan3:        5521 RPM  (min =    0 RPM)
fan4:        4891 RPM  (min =    0 RPM)
fan5:           0 RPM  (min =    0 RPM)
fan6:           0 RPM  (min =    0 RPM)
fan7:        7480 RPM  (min =    0 RPM)
fan8:        7944 RPM  (min =    0 RPM)
temp1:        +39.0°C  (high =  +0.0°C)
power1:      190.00 W

[root@tul163p1 ~]# ls /sys/devices/platform/
alarmtimer  ibmpowernv.0  power  rtc-generic  serial8250  uevent
[root@tul163p1 ~]# ls /sys/devices/platform/ibmpowernv.0/hwmon/hwmon0/
device	    fan2_min	fan4_min    fan6_min	fan8_min   power
fan1_fault  fan3_fault	fan5_fault  fan7_fault	in1_fault  power1_input
fan1_input  fan3_input	fan5_input  fan7_input	in2_fault  subsystem
fan1_min    fan3_min	fan5_min    fan7_min	in3_fault  temp1_input
fan2_fault  fan4_fault	fan6_fault  fan8_fault	in4_fault  temp1_max
fan2_input  fan4_input	fan6_input  fan8_input	name	   uevent
[root@tul163p1 ~]# ls /sys/class/hwmon/hwmon0/
device	    fan2_min	fan4_min    fan6_min	fan8_min   power
fan1_fault  fan3_fault	fan5_fault  fan7_fault	in1_fault  power1_input
fan1_input  fan3_input	fan5_input  fan7_input	in2_fault  subsystem
fan1_min    fan3_min	fan5_min    fan7_min	in3_fault  temp1_input
fan2_fault  fan4_fault	fan6_fault  fan8_fault	in4_fault  temp1_max
fan2_input  fan4_input	fan6_input  fan8_input	name	   uevent
[root@tul163p1 ~]#

Signed-off-by: Neelesh Gupta <neelegup@linux.vnet.ibm.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2014-08-04 07:01:38 -07:00

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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.
inX_input Measured power supply voltage
inX_fault 0: No fail condition.
1: Failing power supply.
power1_input System power consumption (microWatt)