linux-kernel - Re: [PATCH 3/3] input: mt: Move tracking and pointer emulation to input-mt (rev2)

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Message-ID: <4CFD2E15.50105@canonical.com>
Date:	Mon, 06 Dec 2010 10:40:21 -0800
From:	Chase Douglas <chase.douglas@...onical.com>
To:	Henrik Rydberg <rydberg@...omail.se>
CC:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Jiri Kosina <jkosina@...e.cz>, Ping Cheng <pingc@...om.com>,
	Chris Bagwell <chris@...bagwell.com>,
	Peter Hutterer <peter.hutterer@...-t.net>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] input: mt: Move tracking and pointer emulation to
 input-mt (rev2)

On 12/01/2010 09:21 AM, Henrik Rydberg wrote:
> The drivers using the type B protocol all report tracking information
> the same way. The contact id is semantically equivalent to
> ABS_MT_SLOT, and the handling of ABS_MT_TRACKING_ID only complicates
> the driver. The situation can be improved upon by providing a common
> pointer emulation code, thereby removing the need for the tracking id
> in the driver.  This patch moves all tracking event handling over to
> the input core, simplifying both the existing drivers and the ones
> currently in preparation.

When two or more fingers are down, one of the fingers controls
ABS_{X,Y}. I think the aim is to emulate current behavior for
synaptics-style touchpads, which average the position in firmware. Thus,
we should be averaging the touch positions to generate the ABS_{X,Y} values.

-- Chase
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