hwmon: LM95245 driver

A hwmon driver for the National Semiconductor LM95245 dual temperature
sensors chip.

Signed-off-by: Alexander Stein <alexander.stein@systec-electronic.com>
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>

Documentation/hwmon/lm95245

@@ -0,0 +1,33 @@
+Kernel driver lm95245
+==================
+
+Supported chips:
+  * National Semiconductor LM95245
+    Addresses scanned: I2C 0x18, 0x19, 0x29, 0x4c, 0x4d
+    Datasheet: Publicly available at the National Semiconductor website
+               http://www.national.com/mpf/LM/LM95245.html
+
+
+Author: Alexander Stein <alexander.stein@systec-electronic.com>
+
+Description
+-----------
+
+The LM95245 is an 11-bit digital temperature sensor with a 2-wire System
+Management Bus (SMBus) interface and TruTherm technology that can monitor
+the temperature of a remote diode as well as its own temperature.
+The LM95245 can be used to very accurately monitor the temperature of
+external devices such as microprocessors.
+
+All temperature values are given in millidegrees Celsius. Local temperature
+is given within a range of -127 to +127.875 degrees. Remote temperatures are
+given within a range of -127 to +255 degrees. Resolution depends on
+temperature input and range.
+
+Each sensor has its own critical limit, but the hysteresis is common to all
+two channels.
+
+The lm95245 driver can change its update interval to a fixed set of values.
+It will round up to the next selectable interval. See the datasheet for exact
+values. Reading sensor values more often will do no harm, but will return
+'old' values.

drivers/hwmon/Kconfig

@@ -702,6 +702,15 @@ config SENSORS_LM95241
 	  This driver can also be built as a module.  If so, the module
 	  will be called lm95241.
 
+config SENSORS_LM95245
+	tristate "National Semiconductor LM95245 sensor chip"
+	depends on I2C && EXPERIMENTAL
+	help
+	  If you say yes here you get support for LM95245 sensor chip.
+
+	  This driver can also be built as a module.  If so, the module
+	  will be called lm95245.
+
 config SENSORS_MAX1111
 	tristate "Maxim MAX1111 Multichannel, Serial 8-bit ADC chip"
 	depends on SPI_MASTER

drivers/hwmon/Makefile

@@ -80,6 +80,7 @@ obj-$(CONFIG_SENSORS_LM90)	+= lm90.o
 obj-$(CONFIG_SENSORS_LM92)	+= lm92.o
 obj-$(CONFIG_SENSORS_LM93)	+= lm93.o
 obj-$(CONFIG_SENSORS_LM95241)	+= lm95241.o
+obj-$(CONFIG_SENSORS_LM95245)	+= lm95245.o
 obj-$(CONFIG_SENSORS_LTC4151)	+= ltc4151.o
 obj-$(CONFIG_SENSORS_LTC4215)	+= ltc4215.o
 obj-$(CONFIG_SENSORS_LTC4245)	+= ltc4245.o