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

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Date:	Tue, 26 Jul 2011 10:18:02 +0800
From:	Daniel Kurtz <djkurtz@...omium.org>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	rydberg@...omail.se, chase.douglas@...onical.com,
	rubini@...l.unipv.it, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org, derek.foreman@...labora.co.uk,
	daniel.stone@...labora.co.uk, olofj@...omium.org
Subject: Re: [PATCH 8/9 v2] Input: add BTN_TOOL_QUINTTAP for reporting 5
 fingers on touchpad

Hi Dmitry, et al,

On Tue, Jul 26, 2011 at 2:16 AM, Dmitry Torokhov
<dmitry.torokhov@...il.com> wrote:
>
> On Mon, Jul 25, 2011 at 05:14:22PM +0800, Daniel Kurtz wrote:
> > On Mon, Jul 25, 2011 at 4:29 PM, Dmitry Torokhov
> > <dmitry.torokhov@...il.com> wrote:
> > >
> > > On Wed, Jul 20, 2011 at 09:39:05PM +0800, djkurtz@...omium.org wrote:
> > > > From: Daniel Kurtz <djkurtz@...omium.org>
> > > >
> > >
> > > Do we know what we want to do with this gesture? Because if not I'd
> > > rather not merge it for now, until there are real users.
> >
> > And do what instead?
> > Report 5 fingers with BTN_TOOL_QUADTAP?
> >
>
> 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.

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

-Dan
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