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HID: hid-multitouch: support fine-grain orientation reporting

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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>
This commit is contained in:
Wei-Ning Huang
2017-10-12 14:21:43 +08:00
committed by Jiri Kosina
parent 127e71bd46
commit 00720277a5
3 changed files with 54 additions and 8 deletions
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9
Documentation/input/multi-touch-protocol.rst
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@@ -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