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| author | Song Hongyan <hongyan.song@intel.com> | 2017-01-05 18:24:04 +0800 |
|---|---|---|
| committer | Jonathan Cameron <jic23@kernel.org> | 2017-01-05 13:07:24 +0000 |
| commit | 0e377f3b9ae936aefe5aaca4c2e2546d57b63df7 (patch) | |
| tree | 945539660c44e6b8860713402136ef121ba49f60 /include | |
| parent | 571299d099dcce0ff32c76e70e32e0ba01e55adc (diff) | |
| download | op-kernel-dev-0e377f3b9ae936aefe5aaca4c2e2546d57b63df7.zip op-kernel-dev-0e377f3b9ae936aefe5aaca4c2e2546d57b63df7.tar.gz | |
iio: Add gravity sensor support
Gravity sensor is a soft sensor, which derives value from
standard accelerometer device by filtering out the acceleration
which is not caused by gravity.
Gravity sensor provides a three dimensional vector indicating
the direction and magnitude of gravity. Typically, this sensor
is used to determine the device's relative orientation in space.
The units and the coordinate system is the same as the one used by
the acceleration sensor.
When a device is at rest, the output of the gravity sensor should
be identical to that of the accelerometer.
More information can be found in:
http://www.usb.org/developers/hidpage/HUTRR59_-_Usages_for_Wearables.pdf
Gravity sensor and accelerometer have similar channels and
share channel usage ids. So the most of the code for accel_3d
can be reused.
Signed-off-by: Song Hongyan <hongyan.song@intel.com>
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/hid-sensor-ids.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/hid-sensor-ids.h b/include/linux/hid-sensor-ids.h index 9a3a9db..30c7dc4 100644 --- a/include/linux/hid-sensor-ids.h +++ b/include/linux/hid-sensor-ids.h @@ -52,6 +52,9 @@ #define HID_USAGE_SENSOR_ANGL_VELOCITY_Y_AXIS 0x200458 #define HID_USAGE_SENSOR_ANGL_VELOCITY_Z_AXIS 0x200459 +/* Gravity vector */ +#define HID_USAGE_SENSOR_GRAVITY_VECTOR 0x20007B + /* ORIENTATION: Compass 3D: (200083) */ #define HID_USAGE_SENSOR_COMPASS_3D 0x200083 #define HID_USAGE_SENSOR_DATA_ORIENTATION 0x200470 |
