iio: Add si7005 relative humidity and temperature sensor driver

sensor provides 12-bit relative humidity and 14-bit temperature
via I2C interface; temperature and linearity compensation is not
implemented (yet)

driver also supports the Si7015, but not the 2nd generation
sensors Si7013/Si7020/Si7021

datasheet is here
http://www.silabs.com/Support%20Documents/TechnicalDocs/Si7005.pdf

v2: (thanks to Lars-Peter Clausen)
* fix coding style
* use devm_iio_device_register()
* change copyright year to 2014

Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net>
Reviewed-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/iio/humidity/Kconfig b/drivers/iio/humidity/Kconfig
index 463c4d9da79e..e116bd8dd0e4 100644
--- a/drivers/iio/humidity/Kconfig
+++ b/drivers/iio/humidity/Kconfig
@@ -12,4 +12,14 @@ config DHT11
           Other sensors should work as well as long as they speak the
           same protocol.
 
+config SI7005
+        tristate "SI7005 relative humidity and temperature sensor"
+        depends on I2C
+        help
+          Say yes here to build support for the Silabs Si7005 relative
+          humidity and temperature sensor.
+
+          To compile this driver as a module, choose M here: the module
+          will be called si7005.
+
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