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Commit c8a85854 authored by Vianney le Clément de Saint-Marcq's avatar Vianney le Clément de Saint-Marcq Committed by Jonathan Cameron
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iio: core: Introduce IIO_CHAN_INFO_CALIBEMISSIVITY 

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: default avatarVianney le Clément de Saint-Marcq <vianney.leclement@essensium.com>
Cc: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
parent a25691c1

Documentation/ABI/testing/sysfs-bus-iio

+11 −0
Original line number Original line Diff line number Diff line
@@ -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.

drivers/iio/industrialio-core.c

+1 −0
Original line number Original line Diff line number Diff line
@@ -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",

};

};





/**

/**

include/linux/iio/iio.h

+1 −0
Original line number Original line Diff line number Diff line
@@ -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 {