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From: "Henrik Rydberg" <rydberg@euromail.se>
To: Daniel Kurtz <djkurtz@chromium.org>
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>,
	chase.douglas@canonical.com, rubini@cvml.unipv.it,
	linux-input@vger.kernel.org, linux-kernel@vger.kernel.org,
	derek.foreman@collabora.co.uk, daniel.stone@collabora.co.uk,
	olofj@chromium.org
Subject: Re: [PATCH 8/9 v2] Input: add BTN_TOOL_QUINTTAP for reporting 5 fingers on touchpad
Date: Thu, 11 Aug 2011 22:07:08 +0200	[thread overview]
Message-ID: <20110811200708.GA6084@polaris.bitmath.org> (raw)
In-Reply-To: <CAGS+omCAUAgK6thEPqkp0iSFbnzonw0jH77XToptTwTUz5BH7w@mail.gmail.com>

> > 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

WARNING: multiple messages have this Message-ID (diff)
From: "Henrik Rydberg" <rydberg@euromail.se>
To: Daniel Kurtz <djkurtz@chromium.org>
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>,
	chase.douglas@canonical.com, rubini@cvml.unipv.it,
	linux-input@vger.kernel.org, linux-kernel@vger.kernel.org,
	derek.foreman@collabora.co.uk, daniel.stone@collabora.co.uk,
	olofj@chromium.org
Subject: Re: [PATCH 8/9 v2] Input: add BTN_TOOL_QUINTTAP for reporting 5 fingers on touchpad
Date: Thu, 11 Aug 2011 22:07:08 +0200	[thread overview]
Message-ID: <20110811200708.GA6084@polaris.bitmath.org> (raw)
In-Reply-To: <CAGS+omCAUAgK6thEPqkp0iSFbnzonw0jH77XToptTwTUz5BH7w@mail.gmail.com>

> > 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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  reply	other threads:[~2011-08-11 20:33 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-07-20 13:38 [PATCH 0/9 v2] Synaptics image sensor support djkurtz
2011-07-20 13:38 ` [PATCH 1/9 v2] Input: synaptics - refactor y inversion djkurtz
2011-07-23  0:30   ` Chase Douglas
2011-07-25  8:27   ` Dmitry Torokhov
2011-07-26  2:19     ` Daniel Kurtz
2011-07-26 22:59     ` Chase Douglas
2011-07-20 13:38 ` [PATCH 2/9 v2] Input: synaptics - refactor agm packet parsing djkurtz
2011-07-23  0:32   ` Chase Douglas
2011-07-20 13:39 ` [PATCH 3/9 v2] Input: synaptics - refactor initialization of abs position axes djkurtz
2011-07-23  0:36   ` Chase Douglas
2011-07-20 13:39 ` [PATCH 4/9 v2] Input: synaptics - add image sensor support djkurtz
2011-07-20 13:39 ` [PATCH 5/9 v2] Input: synaptics - decode AGM packet types djkurtz
2011-07-20 13:39 ` [PATCH 6/9 v2] Input: synaptics - process finger (<=3) transitions djkurtz
2011-07-23  1:11   ` Chase Douglas
2011-07-20 13:39 ` [PATCH 7/9 v2] Input: synaptics - improved 2->3 finger transition handling djkurtz
2011-07-23  1:07   ` Chase Douglas
2011-07-23  4:36     ` Daniel Kurtz
2011-07-23  4:36       ` Daniel Kurtz
2011-07-26 23:14       ` Chase Douglas
2011-07-27  4:48         ` Daniel Kurtz
2011-07-27  4:48           ` Daniel Kurtz
2011-07-27 21:13           ` Chase Douglas
2011-07-28  1:00             ` Daniel Kurtz
2011-07-28  2:07               ` Chase Douglas
2011-07-28 13:56                 ` Daniel Kurtz
2011-07-28 13:56                   ` Daniel Kurtz
2011-07-28 17:31                   ` Chase Douglas
2011-07-20 13:39 ` [PATCH 8/9 v2] Input: add BTN_TOOL_QUINTTAP for reporting 5 fingers on touchpad djkurtz
2011-07-23  0:59   ` Chase Douglas
2011-07-25  8:29   ` Dmitry Torokhov
2011-07-25  9:14     ` Daniel Kurtz
2011-07-25 18:16       ` Dmitry Torokhov
2011-07-26  2:18         ` Daniel Kurtz
2011-08-11 20:07           ` Henrik Rydberg [this message]
2011-08-11 20:07             ` Henrik Rydberg
2011-07-26 23:03         ` Chase Douglas
2011-07-20 13:39 ` [PATCH 9/9 v2] Input: synaptics - process finger (<=5) transitions djkurtz
2011-07-23  1:02   ` Chase Douglas
2011-07-23  4:11     ` Daniel Kurtz
2011-07-26 23:17       ` Chase Douglas
2011-07-23  1:13 ` [PATCH 0/9 v2] Synaptics image sensor support Chase Douglas

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