iio: chemical: Add IIO_CONCENTRATION channel type
There are air quality sensors that report data back in parts per million
of VOC (Volatile Organic Compounds) which are usually indexed from CO2
or another common pollutant.
This patchset adds an IIO_CONCENTRATION type that returns a percentage
of substance because no other channels types fit this use case.
Modifiers for IIO_MOD_CO2 and IIO_MOD_VOC gas types are defined.
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 20312a0..08903b9 100644
--- a/Documentation/ABI/testing/sysfs-bus-iio
+++ b/Documentation/ABI/testing/sysfs-bus-iio
@@ -1460,3 +1460,14 @@
measurements and return the average value as output data. Each
value resulted from <type>[_name]_oversampling_ratio measurements
is considered as one sample for <type>[_name]_sampling_frequency.
+
+What: /sys/bus/iio/devices/iio:deviceX/in_concentration_raw
+What: /sys/bus/iio/devices/iio:deviceX/in_concentrationX_raw
+What: /sys/bus/iio/devices/iio:deviceX/in_concentration_co2_raw
+What: /sys/bus/iio/devices/iio:deviceX/in_concentrationX_co2_raw
+What: /sys/bus/iio/devices/iio:deviceX/in_concentration_voc_raw
+What: /sys/bus/iio/devices/iio:deviceX/in_concentrationX_voc_raw
+KernelVersion: 4.3
+Contact: linux-iio@vger.kernel.org
+Description:
+ Raw (unscaled no offset etc.) percentage reading of a substance.
diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index bef690e..ee09a94 100644
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -75,6 +75,7 @@
[IIO_ENERGY] = "energy",
[IIO_DISTANCE] = "distance",
[IIO_VELOCITY] = "velocity",
+ [IIO_CONCENTRATION] = "concentration",
};
static const char * const iio_modifier_names[] = {
@@ -111,6 +112,8 @@
[IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z] = "sqrt(x^2+y^2+z^2)",
[IIO_MOD_I] = "i",
[IIO_MOD_Q] = "q",
+ [IIO_MOD_CO2] = "co2",
+ [IIO_MOD_VOC] = "voc",
};
/* relies on pairs of these shared then separate */
diff --git a/include/uapi/linux/iio/types.h b/include/uapi/linux/iio/types.h
index 2f8b117..1e4c4e3 100644
--- a/include/uapi/linux/iio/types.h
+++ b/include/uapi/linux/iio/types.h
@@ -35,6 +35,7 @@
IIO_ENERGY,
IIO_DISTANCE,
IIO_VELOCITY,
+ IIO_CONCENTRATION,
};
enum iio_modifier {
@@ -72,6 +73,8 @@
IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z,
IIO_MOD_I,
IIO_MOD_Q,
+ IIO_MOD_CO2,
+ IIO_MOD_VOC,
};
enum iio_event_type {