diff options
Diffstat (limited to 'Documentation/input/multi-touch-protocol.txt')
| -rw-r--r-- | Documentation/input/multi-touch-protocol.txt | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/Documentation/input/multi-touch-protocol.txt b/Documentation/input/multi-touch-protocol.txt index bdcba154..07215fa 100644 --- a/Documentation/input/multi-touch-protocol.txt +++ b/Documentation/input/multi-touch-protocol.txt @@ -161,7 +161,8 @@ against the glass. The inner region will increase, and in general, the ratio ABS_MT_TOUCH_MAJOR / ABS_MT_WIDTH_MAJOR, which is always smaller than unity, is related to the contact pressure. For pressure-based devices, ABS_MT_PRESSURE may be used to provide the pressure on the contact area -instead. +instead. Devices capable of contact hovering can use ABS_MT_DISTANCE to +indicate the distance between the contact and the surface. In addition to the MAJOR parameters, the oval shape of the contact can be described by adding the MINOR parameters, such that MAJOR and MINOR are the @@ -213,6 +214,12 @@ The pressure, in arbitrary units, on the contact area. May be used instead of TOUCH and WIDTH for pressure-based devices or any device with a spatial signal intensity distribution. +ABS_MT_DISTANCE + +The distance, in surface units, between the contact and the surface. Zero +distance means the contact is touching the surface. A positive number means +the contact is hovering above the surface. + ABS_MT_ORIENTATION The orientation of the ellipse. The value should describe a signed quarter |