Re: [PATCH 8/9 v2] Input: add BTN_TOOL_QUINTTAP for reporting 5 fingers on touchpad

quoted

That, or nothing... The fact that the device can report 5 finger touch
does not mean that anybody cares about this.
--
Dmitry

The only current use of this is to detect "resting thumb + 4-finger-scroll".
"4-finger scroll" is a gesture supported by some applications and
operating systems.
"resting thumb" is when a clickpad user rests a finger (typically a
thumb), in the bottom left "click zone" in anticipation of
click+move=select gestures.
Thus, this 4-finger scroll is actually sometimes a 5-finger gesture.

Which is actually the same reason QUADTAP was added originally... are
we entering a recursion here? ;-)

I tend to agree with Dmitry - without a clear usage, it makes sense to
instead wait to see which comes first - a five-finger usecase or a
true MT device that everybody can afford.

Similarly, I work with many touchpads from different vendors, some of
which do actually provide 5 independent finger coordinates.  The
drivers for these touchpads truly send 5 MT-B slots when 5 fingers are
present.

Should these drivers perform input_mt_report_pointer_emulation()?
If so, should we add BTN_TOOL_QUINTTAP to allow them to report 5
fingers in emulation mode?

Pointer emulation is a separate issue from the number of finger
reports.

Or is that ridiculous, since emulation is only for old userspace
programs which wouldn't know what to do with QUINTTAP, anyway?

I would say yes. ;-)

Cheers,
Henrik
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