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Commit 8ff6b3bc authored by Matt Ranostay's avatar Matt Ranostay Committed by Jonathan Cameron
Browse files

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: default avatarMatt Ranostay <mranostay@gmail.com>
Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
parent 0df5a548

Documentation/ABI/testing/sysfs-bus-iio

+11 −0
Original line number Diff line number Diff line
@@ -1460,3 +1460,14 @@ Description: 
		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.

drivers/iio/industrialio-core.c

+3 −0
Original line number Diff line number Diff line
@@ -75,6 +75,7 @@ static const char * const iio_chan_type_name_spec[] = { 
	[IIO_ENERGY] = "energy",

	[IIO_DISTANCE] = "distance",

	[IIO_VELOCITY] = "velocity",

	[IIO_CONCENTRATION] = "concentration",

};



static const char * const iio_modifier_names[] = {
@@ -111,6 +112,8 @@ static const char * const iio_modifier_names[] = { 
	[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 */

include/uapi/linux/iio/types.h

+3 −0
Original line number Diff line number Diff line
@@ -35,6 +35,7 @@ enum iio_chan_type { 
	IIO_ENERGY,

	IIO_DISTANCE,

	IIO_VELOCITY,

	IIO_CONCENTRATION,

};



enum iio_modifier {
@@ -72,6 +73,8 @@ enum iio_modifier { 
	IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z,

	IIO_MOD_I,

	IIO_MOD_Q,

	IIO_MOD_CO2,

	IIO_MOD_VOC,

};



enum iio_event_type {