diff options
| author | Wei-Ning Huang <wnhuang@chromium.org> | 2017-10-12 14:21:43 +0800 |
|---|---|---|
| committer | Jiri Kosina <jkosina@suse.cz> | 2017-12-01 10:01:01 +0100 |
| commit | 00720277a517e6dcc4773fb413711fe0131ee9bd (patch) | |
| tree | ef9e7d02143daab51abe1d03fefd41238812fb6a /Documentation/input | |
| parent | 127e71bd462b87301f5ff1d1fd686515b4a4af9c (diff) | |
| download | linux-00720277a517e6dcc4773fb413711fe0131ee9bd.tar.bz2 | |
HID: hid-multitouch: support fine-grain orientation reporting
The current hid-multitouch driver only allow the report of two
orientations, vertical and horizontal. We use the Azimuth orientation
usage 0x3F under the Digitizer usage page to report orientation if the
device supports it.
Changelog:
v1 -> v2:
- Fix commit message.
- Remove resolution reporting for ABS_MT_ORIENTATION.
v2 -> v3:
- Fix commit message.
v3 -> v4:
- Fix ABS_MT_ORIENTATION ABS param range.
- Don't set ABS_MT_ORIENTATION in ABS_DG_HEIGHT when it is already
set by ABS_DG_AZIMUTH.
v4 -> v5:
- Improve multi-touch-protocol.rst documentation.
Signed-off-by: Wei-Ning Huang <wnhuang@chromium.org>
Signed-off-by: Wei-Ning Huang <wnhuang@google.com>
Reviewed-by: Dmitry Torokhov <dtor@chromium.org>
Reviewed-by: Henrik Rydberg <rydberg@bitmath.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'Documentation/input')
| -rw-r--r-- | Documentation/input/multi-touch-protocol.rst | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/Documentation/input/multi-touch-protocol.rst b/Documentation/input/multi-touch-protocol.rst index 8035868c56bc..b51751a0cd5d 100644 --- a/Documentation/input/multi-touch-protocol.rst +++ b/Documentation/input/multi-touch-protocol.rst @@ -269,10 +269,11 @@ ABS_MT_ORIENTATION The orientation of the touching ellipse. The value should describe a signed quarter of a revolution clockwise around the touch center. The signed value range is arbitrary, but zero should be returned for an ellipse aligned with - the Y axis of the surface, a negative value when the ellipse is turned to - the left, and a positive value when the ellipse is turned to the - right. When completely aligned with the X axis, the range max should be - returned. + the Y axis (north) of the surface, a negative value when the ellipse is + turned to the left, and a positive value when the ellipse is turned to the + right. When aligned with the X axis in the positive direction, the range + max should be returned; when aligned with the X axis in the negative + direction, the range -max should be returned. Touch ellipsis are symmetrical by default. For devices capable of true 360 degree orientation, the reported orientation must exceed the range max to |