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iio: core: Introduce IIO_CHAN_INFO_CALIBEMISSIVITY

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Contact-less IR temperature sensors measure the temperature of an object
by using its thermal radiation.  Surfaces with different emissivity
ratios emit different amounts of energy at the same temperature.

IIO_CHAN_INFO_CALIBEMISSIVITY allows the user to inform the sensor of the
emissivity of the object in front of it, in order to effectively measure
its temperature.

A device providing such setting is Melexis's MLX90614:
http://melexis.com/Assets/IR-sensor-thermometer-MLX90614-Datasheet-5152.aspx.

Signed-off-by: Vianney le Clément de Saint-Marcq <vianney.leclement@essensium.com>
Cc: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Vianney le Clément de Saint-Marcq 2015-03-30 10:34:58 +02:00 committed by Jonathan Cameron
parent a25691c1f9
commit c8a8585431
3 changed files with 13 additions and 0 deletions
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11
Documentation/ABI/testing/sysfs-bus-iio
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@ -1364,3 +1364,14 @@ Description:
hwfifo_watermak_min but not equal to any of the values in this hwfifo_watermak_min but not equal to any of the values in this
list, the driver will chose an appropriate value for the list, the driver will chose an appropriate value for the
hardware fifo watermark level. hardware fifo watermark level.
What: /sys/bus/iio/devices/iio:deviceX/in_temp_calibemissivity
What: /sys/bus/iio/devices/iio:deviceX/in_tempX_calibemissivity
What: /sys/bus/iio/devices/iio:deviceX/in_temp_object_calibemissivity
What: /sys/bus/iio/devices/iio:deviceX/in_tempX_object_calibemissivity
KernelVersion: 4.1
Contact: linux-iio@vger.kernel.org
Description:
The emissivity ratio of the surface in the field of view of the
contactless temperature sensor. Emissivity varies from 0 to 1,
with 1 being the emissivity of a black body.

1
drivers/iio/industrialio-core.c
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@ -128,6 +128,7 @@ static const char * const iio_chan_info_postfix[] = {
[IIO_CHAN_INFO_CALIBWEIGHT] = "calibweight", [IIO_CHAN_INFO_CALIBWEIGHT] = "calibweight",
[IIO_CHAN_INFO_DEBOUNCE_COUNT] = "debounce_count", [IIO_CHAN_INFO_DEBOUNCE_COUNT] = "debounce_count",
[IIO_CHAN_INFO_DEBOUNCE_TIME] = "debounce_time", [IIO_CHAN_INFO_DEBOUNCE_TIME] = "debounce_time",
[IIO_CHAN_INFO_CALIBEMISSIVITY] = "calibemissivity",
}; };
/** /**

1
include/linux/iio/iio.h
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@ -43,6 +43,7 @@ enum iio_chan_info_enum {
IIO_CHAN_INFO_CALIBWEIGHT, IIO_CHAN_INFO_CALIBWEIGHT,
IIO_CHAN_INFO_DEBOUNCE_COUNT, IIO_CHAN_INFO_DEBOUNCE_COUNT,
IIO_CHAN_INFO_DEBOUNCE_TIME, IIO_CHAN_INFO_DEBOUNCE_TIME,
IIO_CHAN_INFO_CALIBEMISSIVITY,
}; };
enum iio_shared_by { enum iio_shared_by {