linux-kernel - Re: [PATCH] psmouse: disable the synaptics extension on OLPC machines.

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Date:	Sun, 19 Dec 2010 00:37:09 -0800
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Andres Salomon <dilinger@...ued.net>
Cc:	Daniel Drake <dsd@...top.org>, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org, pgf@...top.org,
	James Cameron <quozl@...top.org>
Subject: Re: [PATCH] psmouse: disable the synaptics extension on OLPC
 machines.

On Sun, Dec 19, 2010 at 12:32:14AM -0800, Andres Salomon wrote:
> On Sun, 19 Dec 2010 00:20:27 -0800
> Dmitry Torokhov <dmitry.torokhov@...il.com> wrote:
> 
> > On Sat, Dec 18, 2010 at 10:00:51AM +0000, Daniel Drake wrote:
> > > On 18 December 2010 07:02, Dmitry Torokhov
> > > <dmitry.torokhov@...il.com> wrote:
> > > > What about just adding psmouse.proto=exps then?
> > > 
> > > It's not quite that simple either, because we want the same distro
> > > image to work on all versions of XO. XO's can come with either hgpk,
> > > synaptics, or sentelic touchpads. In the sentelic and hgpk cases,
> > > we'd want the "real" drivers to kick in.
> > > 
> > 
> > Hmm, I am confused. HGPK depends on OLPC so your distribution must
> > have it defined. Are there general purpose distributions that enable
> > OLPC?
> 
> 
> Yes, Debian enables CONFIG_OLPC in its 486 kernel (and one of these
> days, I'll open up a bug for them to enable it in their 686 kernel).
> 
> There are 3 types of touchpads in OLPC XO machines (hgpk, synaptics,
> and sentelics).  If the hardware is either hgpk or sentelics, we want
> those extensions to load.  If the hardware is synaptics, we want the
> extension not to load.  Doing this via kernel
> arg doesn't work, as a generic distributions (and even those built
> specifically for OLPC XOs) will not know which touchpad hardware will
> be in use.
> 

It still should be theoretically possible to do it in userspace (playing
with protocol settings via sysfs) but I think in kernel is less painful.
I'll apply the patch.

Thanks for the explanations.

-- 
Dmitry
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