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author | Roan van Dijk <roan@protonic.nl> | 2021-10-08 13:17:06 +0300 |
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committer | Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2021-10-19 10:30:44 +0300 |
commit | d6fa1406306d6608d50e974551c61ebbfa5e26d0 (patch) | |
tree | fa7e6c00951f31cdd384794b57e9c40e56306c76 /Documentation/ABI/testing/sysfs-bus-iio | |
parent | 49d22b695cbb690b1d1a9d21b61eaf8f61a525d4 (diff) | |
download | linux-d6fa1406306d6608d50e974551c61ebbfa5e26d0.tar.xz |
iio: documentation: Document scd4x calibration use
Add entries from Documentation/ABI/testing/sysfs-bus-iio-scd30
to Documentation/ABI/testing/sysfs-bus-iio. The attributes of the scd4x
and scd30 are common.
Remove Documentation/ABI/testing/sysfs-bus-iio-scd30.
Signed-off-by: Roan van Dijk <roan@protonic.nl>
Link: https://lore.kernel.org/r/20211008101706.755942-5-roan@protonic.nl
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Diffstat (limited to 'Documentation/ABI/testing/sysfs-bus-iio')
-rw-r--r-- | Documentation/ABI/testing/sysfs-bus-iio | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio index f19ff76a3b54..c551301b33f1 100644 --- a/Documentation/ABI/testing/sysfs-bus-iio +++ b/Documentation/ABI/testing/sysfs-bus-iio @@ -1958,3 +1958,44 @@ Description: Specify the percent for light sensor relative to the channel absolute value that a data field should change before an event is generated. Units are a percentage of the prior reading. + +What: /sys/bus/iio/devices/iio:deviceX/calibration_auto_enable +Date: June 2020 +KernelVersion: 5.8 +Contact: linux-iio@vger.kernel.org +Description: + Some sensors have the ability to apply auto calibration at + runtime. For example, it may be necessary to compensate for + contaminant build-up in a measurement chamber or optical + element deterioration that would otherwise lead to sensor drift. + + Writing 1 or 0 to this attribute will respectively activate or + deactivate this auto calibration function. + + Upon reading, the current status is returned. + +What: /sys/bus/iio/devices/iio:deviceX/calibration_forced_value +Date: June 2020 +KernelVersion: 5.8 +Contact: linux-iio@vger.kernel.org +Description: + Some sensors have the ability to apply a manual calibration using + a known measurement value, perhaps obtained from an external + reference device. + + Writing a value to this function will force such a calibration + change. For the scd30 the value should be from the range + [400 1 2000]. + + Note for the scd30 that a valid value may only be obtained once + it is has been written. Until then any read back of this value + should be ignored. As for the scd4x an error will be returned + immediately if the manual calibration has failed. + +What: /sys/bus/iio/devices/iio:deviceX/calibration_forced_value_available +KernelVersion: 5.15 +Contact: linux-iio@vger.kernel.org +Description: + Available range for the forced calibration value, expressed as: + + - a range specified as "[min step max]" |