Staging: iio: tsl2563 ambient light sensor driver

Add driver support for the tsl2563 TAOS ambient light sensor. After looking at
discussions on LKML, the driver was modified from a 'hwmon' driver to an 'iio'
driver. The sysfs interfaces have been tested on an RX51 (N900) to see if it
responds to changing light conditions.

The only real reason for submitting this to staging is that it is dependent on
the IIO subsystem.

Signed-off-by: Amit Kucheria <amit.kucheria@verdurent.com>
Cc: Jonathan Cameron <jic23@cam.ac.uk>
Cc: linux-omap@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/iio/light/Kconfig

@@ -11,3 +11,14 @@ config TSL2561
 	convertor.  This chip has two light sensors. One is broadband
 	including infrared whilst the other measures only infrared.
 	Provides direct access via sysfs.
+
+config SENSORS_TSL2563
+	tristate "TAOS TSL2563 ambient light sensor"
+	depends on I2C
+	help
+	 If you say yes here you get support for the Taos TSL2563
+	 ambient light sensor (found in N900).
+
+	 This driver can also be built as a module.  If so, the module
+	 will be called tsl2563.
+

drivers/staging/iio/light/Makefile

@@ -3,3 +3,4 @@
 #
 
 obj-$(CONFIG_TSL2561)   += tsl2561.o
+obj-$(CONFIG_SENSORS_TSL2563)	+= tsl2563.o

drivers/staging/iio/light/tsl2563.h

@@ -0,0 +1,9 @@
+#ifndef __LINUX_TSL2563_H
+#define __LINUX_TSL2563_H
+
+struct tsl2563_platform_data {
+	int cover_comp_gain;
+};
+
+#endif /* __LINUX_TSL2563_H */
+