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_EMISSIVITY 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@xxxxxxxxxxxxx> Cc: Arnout Vandecappelle (Essensium/Mind) <arnout@xxxxxxx> --- 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 9a70c31..a8b103a 100644 --- a/Documentation/ABI/testing/sysfs-bus-iio +++ b/Documentation/ABI/testing/sysfs-bus-iio @@ -1249,3 +1249,14 @@ Contact: linux-iio@xxxxxxxxxxxxxxx Description: Specifies number of seconds in which we compute the steps that occur in order to decide if the consumer is making steps. + +What: /sys/bus/iio/devices/iio:deviceX/in_temp_emissivity +What: /sys/bus/iio/devices/iio:deviceX/in_tempX_emissivity +What: /sys/bus/iio/devices/iio:deviceX/in_temp_object_emissivity +What: /sys/bus/iio/devices/iio:deviceX/in_tempX_object_emissivity +KernelVersion: 4.0 +Contact: linux-iio@xxxxxxxxxxxxxxx +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..902d03b 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_EMISSIVITY] = "emissivity", }; /** diff --git a/include/linux/iio/iio.h b/include/linux/iio/iio.h index 80d8550..24bd0bdd 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_EMISSIVITY, }; enum iio_shared_by { -- 2.3.3 -- To unsubscribe from this list: send the line "unsubscribe linux-iio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
