Re: [PATCH 2/2] elantech: Report multitouch with proper ABS_MT messages

["Éric Piel" <E.A.B.Piel@tudelft.nl>]

Op 05-05-10 20:26, Henrik Rydberg schreef:
> Éric Piel wrote:
:
>> Let me give you some more details. From what is seems, the hardware can
>> reports the width of a touch, but only when there is one single touch.
>> So far we report it via ABS_TOOL_WIDTH. When there is 2 or 3 touches,
>> the width is unknown. So the precise question is:
>> Should we report also ABS_MT_TOUCH_MAJOR in addition to ABS_TOOL_WIDTH,
>> whenever it is known (ie: one finger), or just not bother and only
>> report ABS_TOOL_WIDTH?
> 
> With only partial information available it will not be of much use anyway, so
> omitting ABS_MT_TOUCH is probably best. The ABS_TOOL_WIDTH will most likely not
> be used by a driver either (it wont in the Multitouch X Driver anyways). The
> synaptics driver cares for palm detection, but the scale has to be very specific
> to work properly (i.e., requires testing with synaptics to be useful).
Thanks for clarifying!

BTW, does anyone know a graphical app which reads the MT events from a
/dev/input/eventX device and displays them as points in a window? That
would be rather helpful to reverse-engineer/debug multitouch hardwares.

Eric

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