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>
SchmErik · Aug 4, 2014 · 24c1aa8 · 24c1aa8
1 parent a8bfece
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diff --git a/Documentation/devicetree/bindings/hwmon/ibmpowernv.txt b/Documentation/devicetree/bindings/hwmon/ibmpowernv.txt
@@ -0,0 +1,23 @@
+IBM POWERNV platform sensors
+----------------------------
+
+Required node properties:
+- compatible: must be one of
+		"ibm,opal-sensor-cooling-fan"
+		"ibm,opal-sensor-amb-temp"
+		"ibm,opal-sensor-power-supply"
+		"ibm,opal-sensor-power"
+- sensor-id: an opaque id provided by the firmware to the kernel, identifies a
+	     given sensor and its attribute data
+
+Example sensors node:
+
+cooling-fan#8-data {
+	sensor-id = <0x7052107>;
+	compatible = "ibm,opal-sensor-cooling-fan";
+};
+
+amb-temp#1-thrs {
+	sensor-id = <0x5096000>;
+	compatible = "ibm,opal-sensor-amb-temp";
+};
diff --git a/Documentation/hwmon/ibmpowernv b/Documentation/hwmon/ibmpowernv
@@ -0,0 +1,41 @@
+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)
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
@@ -554,6 +554,17 @@ config SENSORS_IBMPEX
 	  This driver can also be built as a module.  If so, the module
 	  will be called ibmpex.
 
+config SENSORS_IBMPOWERNV
+	tristate "IBM POWERNV platform sensors"
+	depends on PPC_POWERNV
+	default y
+	help
+	  If you say yes here you get support for the temperature/fan/power
+	  sensors on your PowerNV platform.
+
+	  This driver can also be built as a module. If so, the module
+	  will be called ibmpowernv.
+
 config SENSORS_IIO_HWMON
 	tristate "Hwmon driver that uses channels specified via iio maps"
 	depends on IIO

diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
@@ -71,6 +71,7 @@ obj-$(CONFIG_SENSORS_ULTRA45)	+= ultra45_env.o
 obj-$(CONFIG_SENSORS_I5K_AMB)	+= i5k_amb.o
 obj-$(CONFIG_SENSORS_IBMAEM)	+= ibmaem.o
 obj-$(CONFIG_SENSORS_IBMPEX)	+= ibmpex.o
+obj-$(CONFIG_SENSORS_IBMPOWERNV)+= ibmpowernv.o
 obj-$(CONFIG_SENSORS_IIO_HWMON) += iio_hwmon.o
 obj-$(CONFIG_SENSORS_INA209)	+= ina209.o
 obj-$(CONFIG_SENSORS_INA2XX)	+= ina2xx.o