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Date: Fri, 4 Sep 2015 22:53:23 -0700 From: Matt Ranostay <mranostay@...il.com> To: jic23@...nel.org, lars@...afoo.de, pmeerw@...erw.net Cc: linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org, Matt Ranostay <mranostay@...il.com> Subject: [RFC v1 1/4] 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 and IIO_MOD_PPM/PPB modifiers because no other channels types fit this use case. Signed-off-by: Matt Ranostay <mranostay@...il.com> --- Documentation/ABI/testing/sysfs-bus-iio | 10 ++++++++++ drivers/iio/industrialio-core.c | 3 +++ include/uapi/linux/iio/types.h | 3 +++ 3 files changed, 16 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio index 42d360f..a3803a1 100644 --- a/Documentation/ABI/testing/sysfs-bus-iio +++ b/Documentation/ABI/testing/sysfs-bus-iio @@ -1459,3 +1459,13 @@ 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_concentrationX_raw +What: /sys/bus/iio/devices/iio:deviceX/in_concentrationX_ppm_raw +What: /sys/bus/iio/devices/iio:deviceX/in_concentrationX_ppb_raw +KernelVersion: 4.3 +Contact: linux-iio@...r.kernel.org +Description: + Raw (unscaled no offset etc.) concentration reading of data like + CO2 or VOC (Volatile Organic Compounds) substances with or without + ppm (Part Per Million) or ppb (Parts Per Billion) channel modifiers. diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c index b3fcc2c..ea9e31a 100644 --- a/drivers/iio/industrialio-core.c +++ b/drivers/iio/industrialio-core.c @@ -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_PPM] = "ppm", + [IIO_MOD_PPB] = "ppb", }; /* 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..dfb8b8c 100644 --- a/include/uapi/linux/iio/types.h +++ b/include/uapi/linux/iio/types.h @@ -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_PPM, + IIO_MOD_PPB, }; enum iio_event_type { -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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