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Diffstat (limited to 'Documentation/input/multi-touch-protocol.rst')
| -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 |