linux-kernel - Re: [PATCH v3] input: mt: Move tracking and pointer emulation to input-mt

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Message-ID: <alpine.LNX.2.00.1012071553100.14806@pobox.suse.cz>
Date:	Tue, 7 Dec 2010 15:53:35 +0100 (CET)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Henrik Rydberg <rydberg@...omail.se>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	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 v3] input: mt: Move tracking and pointer emulation to
 input-mt

On Tue, 7 Dec 2010, 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.
> 
> Signed-off-by: Henrik Rydberg <rydberg@...omail.se>
> ---
> This is revision three of the patch, with changes to incorporate the
> active use of ABS_MT_TOOL_TYPE. Example usages are found in pen and
> touch tablets and simple dual touch devices. The report_slot_state()
> function now takes the tool type as argument, since a change in either
> tool type of touch state should trigger a new tracking id.
> 
> Thanks,
> Henrik
> 
>  drivers/hid/hid-3m-pct.c                |   30 +---------

Acked-by: Jiri Kosina <jkosina@...e.cz>

-- 
Jiri Kosina
SUSE Labs, Novell Inc.
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