iio: ph: add IIO_PH channel type

Signed-off-by: Matt Ranostay <mranostay@gmail.com>
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 8fadd27..80c6fce 100644 (file)
--- a/Documentation/ABI/testing/sysfs-bus-iio
+++ b/Documentation/ABI/testing/sysfs-bus-iio
@@ -1493,3 +1493,10 @@ Description:
                This ABI is especially applicable for humidity sensors
                to heatup the device and get rid of any condensation
                in some humidity environment
+
+What:          /sys/bus/iio/devices/iio:deviceX/in_ph_raw
+KernelVersion: 4.5
+Contact:       linux-iio@vger.kernel.org
+Description:
+               Raw (unscaled no offset etc.) pH reading of a substance as a negative
+               base-10 logarithm of hydrodium ions in a litre of water.

diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index fd01f34..eb01a83 100644 (file)
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -77,6 +77,7 @@ static const char * const iio_chan_type_name_spec[] = {
        [IIO_VELOCITY] = "velocity",
        [IIO_CONCENTRATION] = "concentration",
        [IIO_RESISTANCE] = "resistance",
+       [IIO_PH] = "ph",
 };
 
 static const char * const iio_modifier_names[] = {

diff --git a/include/uapi/linux/iio/types.h b/include/uapi/linux/iio/types.h
index 7c63bd6..c077617 100644 (file)
--- a/include/uapi/linux/iio/types.h
+++ b/include/uapi/linux/iio/types.h
@@ -37,6 +37,7 @@ enum iio_chan_type {
        IIO_VELOCITY,
        IIO_CONCENTRATION,
        IIO_RESISTANCE,
+       IIO_PH,
 };
 
 enum iio_modifier {