linux-kernel - Re: [PATCH 2/3] Input: synaptics - add multi-finger and semi-mt support

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Message-ID: <AANLkTin-o4VDnLS-bURhyzqb2Go5a9XJOoSCcdH2vkRT@mail.gmail.com>
Date:	Mon, 20 Dec 2010 10:20:13 -0600
From:	Chris Bagwell <chris@...bagwell.com>
To:	Henrik Rydberg <rydberg@...omail.se>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Jiri Kosina <jkosina@...e.cz>, Takashi Iwai <tiwai@...e.de>,
	Chase Douglas <chase.douglas@...onical.com>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] Input: synaptics - add multi-finger and semi-mt support

On Mon, Dec 20, 2010 at 7:39 AM, Henrik Rydberg <rydberg@...omail.se> wrote:
> The Synaptics 2.7 series of touchpads support a mode for reporting two
> sets of X/Y/Pressure data (advanced gesture mode). By default, these
> devices report only single finger data, depriving userspace of the
> nowadays ubiquitous two-finger scroll gesture.
>
> Enabling advanced gesture mode also enables the multi-finger report,
> although the device does not claim that capability. Up to three
> fingers can be reported this way.
>
> While two or three fingers are touching, the normal packet is
> prepended by a reduced finger packet of lower resolution. From the two
> packets (which do not represent the actual fingers), the bounding
> rectangle of the individual contacts can be extracted.  This
> information is sufficient to perform scaling gestures and a limited
> form of rotation gesture. The behavior has been coined semi-mt
> capability, and is signaled to userspace via the INPUT_PROP_SEMI_MT
> device property.
>
> Work to decode the advanced gesture packet: Takashi Iwai.
> Cleanup and testing of the original patch: Chase Douglas.
> Minor cleanup and testing: Chris Bagwell.
> Finalization and semi-mt support: Henrik Rydberg.
>
> Reported-by: Tobyn Bertram
> Not-yet-signed-off-by: Takashi Iwai <tiwai@...e.de>
> Not-yet-signed-off-by: Chase Douglas <chase.douglas@...onical.com>
> Not-yet-signed-off-by: Chris Bagwell <chris@...bagwell.com>
> Signed-off-by: Henrik Rydberg <rydberg@...omail.se>
> ---


That turned out better.  You can keep my sign off on there.

Chris
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