linux-kernel - Re: [PATCH 1/4] Input: synaptics - add multitouch packet support

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Message-ID: <20101218170603.GA1498@polaris.bitmath.org>
Date:	Sat, 18 Dec 2010 18:06:03 +0100
From:	"Henrik Rydberg" <rydberg@...omail.se>
To:	Chris Bagwell <chris@...bagwell.com>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Jiri Kosina <jkosina@...e.cz>,
	Chase Douglas <chase.douglas@...onical.com>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	Takashi Iwai <tiwai@...e.de>
Subject: Re: [PATCH 1/4] Input: synaptics - add multitouch packet support

On Sat, Dec 18, 2010 at 10:56:59AM -0600, Chris Bagwell wrote:
> On Sat, Dec 18, 2010 at 10:55 AM, Chris Bagwell <chris@...bagwell.com> wrote:
> > On Sat, Dec 18, 2010 at 8:52 AM, Henrik Rydberg <rydberg@...omail.se> wrote:
> >> From: Chase Douglas <chase.douglas@...onical.com>
> >>
> >> Synaptics 2.7 series of touchpads support a mode for reporting 2 sets
> >> of X/Y/Pressure data (multi-touch).  These same devices default mode
> >> report single finger data and do not report finger counts.
> >>
> >> Enabling MT mode makes finger count reporting start working in same
> >> fashion as touchpads that claim that capability. Up to three fingers
> >> can be reported this way.
> >>
> >> While in MT mode and two or three fingers are touching, two sets of
> >> data are sent.  The first is a new format buffer with lower resolution
> >> reporting of stationary finger and the second is standard data format
> >> reporting movement.
> >
> > We should probably update this comment and remove parts that mention
> > stationary and movement.  It appears to be doing finger tracking and
> > first packet is always first touch... except we are getting reports
> > that clickpads/integrated button pads may not be consistently like
> > this.
> >
> 
> Sorry.  Not first packet but higher resolution/second packet.

Not for all devices, it seems - at least not mine, which is not a clickpad.

Henrik
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