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

    > 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. ;-)

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