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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
Browse files

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 Diff line number Diff line
@@ -1364,3 +1364,14 @@ Description: 
		hwfifo_watermak_min but not equal to any of the values in this

		list, the driver will chose an appropriate value for the

		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 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_DEBOUNCE_COUNT] = "debounce_count",

	[IIO_CHAN_INFO_DEBOUNCE_TIME] = "debounce_time",

	[IIO_CHAN_INFO_CALIBEMISSIVITY] = "calibemissivity",

};



/**

include/linux/iio/iio.h

+1 −0
Original line number Diff line number Diff line
@@ -43,6 +43,7 @@ enum iio_chan_info_enum { 
	IIO_CHAN_INFO_CALIBWEIGHT,

	IIO_CHAN_INFO_DEBOUNCE_COUNT,

	IIO_CHAN_INFO_DEBOUNCE_TIME,

	IIO_CHAN_INFO_CALIBEMISSIVITY,

};



enum iio_shared_by {