iio: Add support for humidity sensors

There are already humidity sensors in the hwmon subsystem,
so we use their unit (milli percent) here as well.

Signed-off-by: Harald Geyer <harald@ccbib.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
index b20e829..6e02c50 100644 (file)
--- a/Documentation/ABI/testing/sysfs-bus-iio
+++ b/Documentation/ABI/testing/sysfs-bus-iio
@@ -197,6 +197,19 @@ Description:
                Raw pressure measurement from channel Y. Units after
                application of scale and offset are kilopascal.
 
+What:          /sys/bus/iio/devices/iio:deviceX/in_humidityrelative_raw
+KernelVersion: 3.14
+Contact:       linux-iio@vger.kernel.org
+Description:
+               Raw humidity measurement of air. Units after application of
+               scale and offset are milli percent.
+
+What:          /sys/bus/iio/devices/iio:deviceX/in_humidityrelative_input
+KernelVersion: 3.14
+Contact:       linux-iio@vger.kernel.org
+Description:
+               Scaled humidity measurement in milli percent.
+
 What:          /sys/bus/iio/devices/iio:deviceX/in_accel_offset
 What:          /sys/bus/iio/devices/iio:deviceX/in_accel_x_offset
 What:          /sys/bus/iio/devices/iio:deviceX/in_accel_y_offset

diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index 2fe88c1..acc911a 100644 (file)
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -69,6 +69,7 @@ static const char * const iio_chan_type_name_spec[] = {
        [IIO_ALTVOLTAGE] = "altvoltage",
        [IIO_CCT] = "cct",
        [IIO_PRESSURE] = "pressure",
+       [IIO_HUMIDITYRELATIVE] = "humidityrelative",
 };
 
 static const char * const iio_modifier_names[] = {

diff --git a/include/linux/iio/types.h b/include/linux/iio/types.h
index 4ac928e..084d882 100644 (file)
--- a/include/linux/iio/types.h
+++ b/include/linux/iio/types.h
@@ -29,6 +29,7 @@ enum iio_chan_type {
        IIO_ALTVOLTAGE,
        IIO_CCT,
        IIO_PRESSURE,
+       IIO_HUMIDITYRELATIVE,
 };
 
 enum iio_modifier {