linux-kernel - Re: [PATCH] input: psmouse: create an 'enabled' sysfs attribute to squelch mouse

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Date:	Sat, 25 Feb 2012 11:19:05 -0800
From:	Andres Salomon <dilinger@...ued.net>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	Alessandro Rubini <rubini@...vis.unipv.it>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	Paul Fox <pgf@...top.org>, Martin Langhoff <martin@...top.org>
Subject: Re: [PATCH] input: psmouse:  create an 'enabled' sysfs attribute to
 squelch mouse

On Fri, 24 Feb 2012 00:21:58 -0800
Dmitry Torokhov <dmitry.torokhov@...il.com> wrote:

> Hi Andres,
> 
> On Fri, Feb 17, 2012 at 06:06:34PM -0800, Andres Salomon wrote:
> > 
> > From: Paul Fox <pgf@...top.org>
> > 
> > on OLPC XO laptops, at least one model of touchpad (sentelic)
> > emits continuous jittery motion reports when the laptop is
> > configured in "ebook" mode.  the touchpad is inaccessible in
> > that configuration, so we simply disable it.
> > 
> > these motion reports will wake the SoC when put to sleep, so simply
> > ignoring the events is not a possibilty; the device must be
> > disabled.
> 
> Can you switch the AUX serio port into manual bind mode (viqa sysfs)
> and simply connect/disconnect the touchpad as needed (again via
> sysfs)?
> 

Thanks for the suggestion.  We're in the process of testing that; it
does stop the touchpad from transmitting data, but there are some
reinit issues to be investigated.  Quoth pgf, "the added latency
due to the reinit when we enter/exit ebook mode might or might not be
acceptable.  and our touchpad (sentelic) needs some boot time
initialization from user-level -- we're not sure whether we'll need
to redo some or all of that.  (we do seem to lose the current values of
vscroll and hscroll, for instance.)"
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