linux-kernel - Re: [PATCH 0/3] Input: synaptics - multitouch and multifinger support

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Date:	Mon, 11 Oct 2010 16:24:41 +0200
From:	Henrik Rydberg <rydberg@...omail.se>
To:	Takashi Iwai <tiwai@...e.de>
CC:	Chris Bagwell <chris@...bagwell.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Chase Douglas <chase.douglas@...onical.com>,
	linux-input@...r.kernel.org, xorg-devel@...ts.x.org,
	Andy Whitcroft <apw@...onical.com>,
	linux-kernel@...r.kernel.org,
	Peter Hutterer <peter.hutterer@...-t.net>,
	Duncan McGreggor <duncan.mcgreggor@...onical.com>
Subject: Re: [PATCH 0/3] Input: synaptics - multitouch and multifinger support

On 10/11/2010 04:01 PM, Takashi Iwai wrote:
[...]

> As an example of mess of Clickpad: if you keep your finger on a button
> area and another finger on the normal area, you shouldn't trigger the
> multi-touch mode, no matter whether it's clicked or not.  People tend
> to keep the finger on the button before actually dragging.
> 
> But, if you put both fingers in the button area and sliding together,
> it should be handled as two-finger scrolling.  Also, if you move one
> finger on a button area, it should be tracked as a normal pointer
> movement.


Are you aware of http://bitmath.org/code/multitouch/? The driver was developed
to address very similar issues on the macbook trackpads.

> Another mess is that, as the default setup, the pointer movement is
> too sensitive, and when user pushes down the touchpad for clicking,
> the pointer moves a few or more pixels.  This eventually misses the
> target.  So, some trick to drag the pointer is necessary for click
> action.  One of my patches does it by introducing some "move
> threshold" value.


Also addressed in that project. What I am hoping to see, eventually, is code
similar to the core of the multitouch project in something like ginn. This would
exercise the whole utouch stack in an extensible way, and finally make
multitouch trackpads work the way they are supposed to.

Henrik
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