linux-kernel - Re: [PATCH] input: Add a detailed multi-touch finger data report protocol

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Date:	Fri, 07 Nov 2008 15:26:30 +0100
From:	Henrik Rydberg <rydberg@...omail.se>
To:	"J.R. Mauro" <jrm8005@...il.com>
CC:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] input: Add a detailed multi-touch finger data report
 protocol

J.R. Mauro wrote:
> On Fri, Nov 7, 2008 at 6:15 AM, Henrik Rydberg <rydberg@...omail.se> wrote:
>> In order to utilize the full power of the new multi-touch devices, a
>> way to report detailed finger data to user space is needed. This patch
>> adds a multi-touch (MT) protocol which allows drivers to report details
>> for an arbitrary number of fingers.
> 
> This is a great idea, Henrik. How will things like X11 go about
> leveraging this functionality?

What I have in mind is this:

1. Add support for the MT interface in the trackpad drivers, to the extent
they support the information. First out is bcm5974, for which the interface
is designed. A patch is prepared, but I will keep it on hold for a little
while longer.

2. Add support for the MT protocol in Xorg synaptics and/or a new Xorg
multitouch driver. As you might have guessed, I have an experimental
driver, utilizing the MT protocol. It uses proper matching techniques
to obtain smooth multi-finger actions. My plan is to launch this in user
space as soon as there is kernel support.

Henrik

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