hwmon: Driver for Linear Technologies LTC2945

LTC2945 is a system monitor that measures current, voltage, and power.
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

Documentation/hwmon/ltc2945

+Kernel driver ltc2945
+=====================
+
+Supported chips:
+  * Linear Technology LTC2945
+    Prefix: 'ltc2945'
+    Addresses scanned: -
+    Datasheet:
+        http://cds.linear.com/docs/en/datasheet/2945fa.pdf
+
+Author: Guenter Roeck <linux@roeck-us.net>
+
+
+Description
+-----------
+
+The LTC2945  is a rail-to-rail system monitor that measures current, voltage,
+and power consumption.
+
+
+Usage Notes
+-----------
+
+This driver does not probe for LTC2945 devices, since there is no register
+which can be safely used to identify the chip. You will have to instantiate
+the devices explicitly.
+
+Example: the following will load the driver for an LTC2945 at address 0x10
+on I2C bus #1:
+$ modprobe ltc2945
+$ echo ltc2945 0x10 > /sys/bus/i2c/devices/i2c-1/new_device
+
+
+Sysfs entries
+-------------
+
+Voltage readings provided by this driver are reported as obtained from the ADC
+registers. If a set of voltage divider resistors is installed, calculate the
+real voltage by multiplying the reported value with (R1+R2)/R2, where R1 is the
+value of the divider resistor against the measured voltage and R2 is the value
+of the divider resistor against Ground.
+
+Current reading provided by this driver is reported as obtained from the ADC
+Current Sense register. The reported value assumes that a 1 mOhm sense resistor
+is installed. If a different sense resistor is installed, calculate the real
+current by dividing the reported value by the sense resistor value in mOhm.
+
+in1_input		VIN voltage (mV). Voltage is measured either at
+			SENSE+ or VDD pin depending on chip configuration.
+in1_min			Undervoltage threshold
+in1_max			Overvoltage threshold
+in1_lowest		Lowest measured voltage
+in1_highest		Highest measured voltage
+in1_reset_history	Write 1 to reset in1 history
+in1_min_alarm		Undervoltage alarm
+in1_max_alarm		Overvoltage alarm
+
+in2_input		ADIN voltage (mV)
+in2_min			Undervoltage threshold
+in2_max			Overvoltage threshold
+in2_lowest		Lowest measured voltage
+in2_highest		Highest measured voltage
+in2_reset_history	Write 1 to reset in2 history
+in2_min_alarm		Undervoltage alarm
+in2_max_alarm		Overvoltage alarm
+
+curr1_input		SENSE current (mA)
+curr1_min		Undercurrent threshold
+curr1_max		Overcurrent threshold
+curr1_lowest		Lowest measured current
+curr1_highest		Highest measured current
+curr1_reset_history	Write 1 to reset curr1 history
+curr1_min_alarm		Undercurrent alarm
+curr1_max_alarm		Overcurrent alarm
+
+power1_input		Power (in uW). Power is calculated based on SENSE+/VDD
+			voltage or ADIN voltage depending on chip configuration.
+power1_min		Low lower threshold
+power1_max		High power threshold
+power1_input_lowest	Historical minimum power use
+power1_input_highest	Historical maximum power use
+power1_reset_history	Write 1 to reset power1 history
+power1_min_alarm	Low power alarm
+power1_max_alarm	High power alarm

drivers/hwmon/Kconfig

@@ -776,6 +776,18 @@ config SENSORS_LM93
 	  This driver can also be built as a module.  If so, the module
 	  will be called lm93.
 
+config SENSORS_LTC2945
+	tristate "Linear Technology LTC2945"
+	depends on I2C
+	select REGMAP_I2C
+	default n
+	help
+	  If you say yes here you get support for Linear Technology LTC2945
+	  I2C System Monitor.
+
+	  This driver can also be built as a module. If so, the module will
+	  be called ltc2945.
+
 config SENSORS_LTC4151
 	tristate "Linear Technology LTC4151"
 	depends on I2C

drivers/hwmon/Makefile

@@ -95,6 +95,7 @@ obj-$(CONFIG_SENSORS_LM93)	+= lm93.o
 obj-$(CONFIG_SENSORS_LM95234)	+= lm95234.o
 obj-$(CONFIG_SENSORS_LM95241)	+= lm95241.o
 obj-$(CONFIG_SENSORS_LM95245)	+= lm95245.o
+obj-$(CONFIG_SENSORS_LTC2945)	+= ltc2945.o
 obj-$(CONFIG_SENSORS_LTC4151)	+= ltc4151.o
 obj-$(CONFIG_SENSORS_LTC4215)	+= ltc4215.o
 obj-$(CONFIG_SENSORS_LTC4222)	+= ltc4222.o