Some sensors/sensorhubs can calculate drift or hard iron offsets to apply to raw data to get the true measure data. These offsets are applied by the user space application. When these offsets change, events are raised to tell the application to update the cached offset values. Signed-off-by: Gwendal Grignou <gwendal@xxxxxxxxxxxx> --- Documentation/ABI/testing/sysfs-bus-iio | 33 +++++++++++++++++++++++++ 1 file changed, 33 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio index 47df16c87862d..40da602e7a555 100644 --- a/Documentation/ABI/testing/sysfs-bus-iio +++ b/Documentation/ABI/testing/sysfs-bus-iio @@ -1716,3 +1716,36 @@ Description: Mass concentration reading of particulate matter in ug / m3. pmX consists of particles with aerodynamic diameter less or equal to X micrometers. + +What: /sys/bus/iio/devices/iio:deviceX/in_anglvel_x_offset +What: /sys/bus/iio/devices/iio:deviceX/in_anglvel_y_offset +What: /sys/bus/iio/devices/iio:deviceX/in_anglvel_z_offset +KernelVersion: x.y +Contact: linux-iio@xxxxxxxxxxxxxxx +Description: + Gyroscope drift calculated by the sensor. In addition to factory + calibration, sensor or sensorhub can + detect gyroscope drift and report it to userspace. + +What: /sys/bus/iio/devices/iio:deviceX/in_magn_x_offset +What: /sys/bus/iio/devices/iio:deviceX/in_magn_y_offset +What: /sys/bus/iio/devices/iio:deviceX/in_magn_z_offset +KernelVersion: x.y +Contact: linux-iio@xxxxxxxxxxxxxxx +Description: + Hard Iron bias calculated by the sensor or sensorhub. To be applied by + user space application to the raw data to obtain the geomagnetic field. + +What: /sys/.../iio:deviceX/events/in_accel_offset_change_en +What: /sys/.../iio:deviceX/events/in_magn_offset_change_en +What: /sys/.../iio:deviceX/events/in_magn_scale_change_en +What: /sys/.../iio:deviceX/events/in_anglvel_offset_change_en +KernelVersion: x.y +Contact: linux-iio@xxxxxxxxxxxxxxx +Description: + Some sensors internally calculate offset to apply to remove bias (for + instance, hard/soft-iron bias for magnetometer, online calibration bias for + gyroscope or accelerometer). + When the sensor computes a new set of offset values, it generates an + event for the userspace application to refresh the offsets to apply to raw + data. -- 2.28.0.402.g5ffc5be6b7-goog
