Re: [PATCH v3 1/5] iio: core: Introduce IIO_CHAN_INFO_CALIBEMISSIVITY

[Jonathan Cameron <jic23@kernel.org>]

On 30/03/15 09:34, Vianney le Clément de Saint-Marcq wrote:
> 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>
> 
Applied to the togreg branch of iio.git - initially pushed out as testing...

Jonathan
> ---
> 
> v3: rename EMISSIVITY to CALIBEMISSIVITY
> v2: new patch
> ---
>  Documentation/ABI/testing/sysfs-bus-iio | 11 +++++++++++
>  drivers/iio/industrialio-core.c         |  1 +
>  include/linux/iio/iio.h                 |  1 +
>  3 files changed, 13 insertions(+)
> 
> diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
> index 103dd9b..cf67f63 100644
> --- a/Documentation/ABI/testing/sysfs-bus-iio
> +++ b/Documentation/ABI/testing/sysfs-bus-iio
> @@ -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.
> diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
> index aaba9d3..e3730be 100644
> --- a/drivers/iio/industrialio-core.c
> +++ b/drivers/iio/industrialio-core.c
> @@ -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",
>  };
>  
>  /**
> diff --git a/include/linux/iio/iio.h b/include/linux/iio/iio.h
> index d86b753..b1e46ae 100644
> --- a/include/linux/iio/iio.h
> +++ b/include/linux/iio/iio.h
> @@ -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 {
>