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input: mt: Add hovering distance axis

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Touch devices capable of hovering, i.e., fingers detected a
distance from the surface, are not supported by the current
input MT protocol. This patch adds ABS_MT_DISTANCE, which may
be used to indicate the distance between the contact and the
surface.

Signed-off-by: Henrik Rydberg <rydberg@euromail.se>
This commit is contained in:
Henrik Rydberg
2010-12-06 10:05:43 +01:00
parent c5f4dec1ce
commit e42a98b520
2 changed files with 10 additions and 2 deletions
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9
Documentation/input/multi-touch-protocol.txt
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@@ -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