iio: Add tcs3472 color light sensor driver

chip has four 16-bit channels for red, green, blue, clear color
intensity; driver supports the TCS3x7x family of devices and was
tested with a TCS34725 chip; further information here:
http://www.ams.com/eng/Products/Light-Sensors/Color-Sensor/TCS34725

v2 (thanks to Jonathan Cameron):
* drop dynamic buffer allocation, buffer is in tcs3472_data
* limit sysfs output to PAGE_SIZE
* check val2 == 0 when writing CALIBSCALE

Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net>
Cc: Jon Brenner <jon.brenner@ams.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig
index 488fff7cd80d..e73a1aba990d 100644
--- a/drivers/iio/light/Kconfig
+++ b/drivers/iio/light/Kconfig
@@ -55,6 +55,16 @@ config SENSORS_LM3533
           changes. The ALS-control output values can be set per zone for the
           three current output channels.
 
+config TCS3472
+        tristate "TAOS TCS3472 color light-to-digital converter"
+        depends on I2C
+        help
+         If you say yes here you get support for the TAOS TCS3472
+         family of color light-to-digital converters with IR filter.
+
+         This driver can also be built as a module.  If so, the module
+         will be called tcs3472.
+
 config SENSORS_TSL2563
         tristate "TAOS TSL2560, TSL2561, TSL2562 and TSL2563 ambient light sensors"
         depends on I2C