linux-kernel - Re: ALPS touchpad with 4 directions button doesnt work as intended

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Message-ID: <1257200188.3164.11.camel@localhost.localdomain>
Date:	Tue, 03 Nov 2009 00:16:28 +0200
From:	Maxim Levitsky <maximlevitsky@...il.com>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: ALPS touchpad with 4 directions button doesnt work as intended

On Tue, 2009-11-03 at 00:12 +0200, Maxim Levitsky wrote:
> On Mon, 2009-11-02 at 10:00 -0800, Dmitry Torokhov wrote:
> > On Mon, Nov 02, 2009 at 07:20:26PM +0200, Maxim Levitsky wrote:
> > > On Sun, 2009-11-01 at 21:38 -0800, Dmitry Torokhov wrote: 
> > > > Hi Maxim,
> > > > 
> > > > On Sat, Oct 31, 2009 at 04:10:18AM +0200, Maxim Levitsky wrote:
> > > > > I have a acer 5720G laptop, and its touchpad (ALPS) has three buttons,
> > > > > usual left/right, and middle button that can be pressed in 4 directions.
> > > > > Up/down direction work fine, but left/right doesn't. This means that
> > > > > left direction  produces middle button click, and right direction
> > > > > doesn't work at all.
> > > > > I took a look at source, and I see that driver doesn't even know about
> > > > > such configuration.
> > > > > 
> > > > > Now I am sure its very easy to figure out what is send when no working
> > > > > button is pressed, but I am a bit confused what BTN_* event to assign to
> > > > > it, so it will work as horizontal scroll as intended.
> > > > > And unassign middle button from other direction....
> > > > > 
> > > > 
> > > > Synaptics driver maps multi-button to BTN_0...BTN_8 and it looks like
> > > > synaptics X driver maps teh 4-button case by default to
> > > > up/down/left/right scroll so I'd map ALPS the same.
> > > > 
> > > Thanks!
> > > 
> > > One question, should I expect some resistance because the button won't
> > > work as middle button by default? (I am sure that in X its easy remap it
> > > back)
> > > 
> > 
> > I am pretty sure these kind of buttons allow 5 distinct presses - left,
> > right, up, down and "straight" (which may be reported either with
> > distinct packet or by reporting both up/down or left/right presses) so
> > you don't have to loose the middle button. This is a speculation
> > though...
> > 
> 
> Mine doesn't unfortunately, this is if I press it 'straight' I both feel
> physicaly 4 different presses and it reports currently, 'back button'
> 'forward button' and 'middle button' as I press it.
> 
> It is possible to implement emulation, but I think that pressing it
> straight might also put some stress and damage it in long run.
> 
> 
> I think that pressing left+right buttons will be enough for the
> replacement. If not, xmodmap can be used to map each of the 4 buttons
> (or all of them to middle one)
> 
> 
> Best regards,
> 	Maxim Levitsky
> 


Sorry,  forgot to CC lkml...



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