iio: Added Capella cm3232 ambient light sensor driver.

CM3232 is an advanced ambient light sensor with I2C protocol interface.
The I2C slave address is internally hardwired as 0x10 (7-bit).  Writing
to configure register is byte mode, but reading ALS register requests to
use word mode for 16-bit resolution.
Signed-off-by: Kevin Tsai <ktsai@capellamicro.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

Documentation/devicetree/bindings/i2c/trivial-devices.txt

@@ -34,6 +34,7 @@ atmel,24c512		i2c serial eeprom  (24cxx)
 atmel,24c1024		i2c serial eeprom  (24cxx)
 atmel,at97sc3204t	i2c trusted platform module (TPM)
 capella,cm32181		CM32181: Ambient Light Sensor
+capella,cm3232		CM3232: Ambient Light Sensor
 catalyst,24c32		i2c serial eeprom
 cirrus,cs42l51		Cirrus Logic CS42L51 audio codec
 dallas,ds1307		64 x 8, Serial, I2C Real-Time Clock

MAINTAINERS

@@ -2379,6 +2379,12 @@ F:	security/capability.c
 F:	security/commoncap.c
 F:	kernel/capability.c
 
+CAPELLA MICROSYSTEMS LIGHT SENSOR DRIVER
+M:	Kevin Tsai <ktsai@capellamicro.com>
+S:	Maintained
+F:	drivers/iio/light/cm*
+F:	Documentation/devicetree/bindings/i2c/trivial-devices.txt
+
 CC2520 IEEE-802.15.4 RADIO DRIVER
 M:	Varka Bhadram <varkabhadram@gmail.com>
 L:	linux-wpan@vger.kernel.org

drivers/iio/light/Kconfig

@@ -48,6 +48,17 @@ config CM32181
 	 To compile this driver as a module, choose M here:
 	 the module will be called cm32181.
 
+config CM3232
+	depends on I2C
+	tristate "CM3232 ambient light sensor"
+	help
+	 Say Y here if you use cm3232.
+	 This option enables ambient light sensor using
+	 Capella Microsystems cm3232 device driver.
+
+	 To compile this driver as a module, choose M here:
+	 the module will be called cm3232.
+
 config CM36651
 	depends on I2C
 	tristate "CM36651 driver"

drivers/iio/light/Makefile

@@ -7,6 +7,7 @@ obj-$(CONFIG_ADJD_S311)		+= adjd_s311.o
 obj-$(CONFIG_AL3320A)		+= al3320a.o
 obj-$(CONFIG_APDS9300)		+= apds9300.o
 obj-$(CONFIG_CM32181)		+= cm32181.o
+obj-$(CONFIG_CM3232)		+= cm3232.o
 obj-$(CONFIG_CM36651)		+= cm36651.o
 obj-$(CONFIG_GP2AP020A00F)	+= gp2ap020a00f.o
 obj-$(CONFIG_HID_SENSOR_ALS)	+= hid-sensor-als.o