linux-kernel - Re: [PATCH 6/9 v2] Input: synaptics - process finger (<=3) transitions

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Message-ID: <4E2A1FC5.90607@canonical.com>
Date:	Fri, 22 Jul 2011 18:11:33 -0700
From:	Chase Douglas <chase.douglas@...onical.com>
To:	djkurtz@...omium.org
CC:	dmitry.torokhov@...il.com, rydberg@...omail.se,
	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 6/9 v2] Input: synaptics - process finger (<=3) transitions

On 07/20/2011 06:39 AM, djkurtz@...omium.org wrote:
> From: Daniel Kurtz <djkurtz@...omium.org>
> 
> Synaptics image sensor touchpads track 5 fingers, but only report 2.
> 
> This patch attempts to deal with some idiosyncrasies of these touchpads:
> 
>  * When there are 3 or more fingers, only two are reported.
>  * The number of fingers can change at any time, but is only reported in
>    SGM packets, thus at a number-of-fingers change, it is not possible
>    to tell whether the AGM finger is for the original or new number of
>    fingers.
>  * When the number of fingers changes from 2->3 it is not
>    possible to tell which of the 2 fingers are now reported.
>  * When number of fingers changes from 3->2 it is often not possible to
>    tell which finger was removed, and which are now being reported.
> 
> When 2 or more packets are present on the touchpad, the kernel reports
                 ^touches or fingers
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