linux-kernel - Re: [PATCH 2/2] input: bcm5974-0.61: New default mouse driver mode

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Message-ID: <20080902085209.ZZRA012@mailhub.coreip.homeip.net>
Date:	Tue, 2 Sep 2008 09:00:26 -0400
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Henrik Rydberg <rydberg@...omail.se>
Cc:	akpm@...l.org, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] input: bcm5974-0.61: New default mouse driver mode

Hi Henrik,

On Mon, Sep 01, 2008 at 10:08:35PM +0200, Henrik Rydberg wrote:
> Currently, the Apple bcm5974 driver only mimics a synaptics touchpad, not a mouse.
> This creates unnecessary complications on systems where the synaptics driver is absent
> or not configured, such as in a completely new system, or a text console.

Mousedev should provide a reasonable emulation of standard mouse
giving user chance to configure the system properly. There is no need
to task the driver to provide such emulation and therefore I will not
apply this patch.

> This patch
> provides a default compatibility configuration, which works as a multi-button mouse,
> implemented using rudimentary multi-finger options. It yields the following benefits:
> 
> * A default Xorg configuration will pick up the mouse input interface, resulting in a
> functional mouse pointer out-of-the-box on many systems.

This happens automatically with Synaptics hardware on newer
distributions (at least Fedora 9 does this). As far as I know
SYnaptics driver does no look for specific product but for a certain
features of the input device and so shoudl work for BCM as well.

> 
> * Two-finger scroll emulates a mouse wheel.
> 
> * Three-finger swipe emulates a horizontal mouse wheel.
> 
> * Multi-finger clicks emulate the middle and right mouse buttons.
>

The kenel driver should only do as little translation as possible,
allowing userspace to decide how to implement more fancy features.

> * The mouse driver also works with gpm in text consoles, providing cut-and-paste functionality.
>

Does not mousedev emulation work from GPM? Also GPM has evdev protocol
support which should work very well with synaptics-like touchpads.

-- 
Dmitry
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