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

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Message-Id: <200911021425.32714.dmitry.torokhov@gmail.com>
Date:	Mon, 2 Nov 2009 14:25:32 -0800
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Maxim Levitsky <maximlevitsky@...il.com>
Cc:	"linux-kernel" <linux-kernel@...r.kernel.org>
Subject: Re: ALPS touchpad with 4 directions button doesnt work as intended

On Monday 02 November 2009 02:16:28 pm Maxim Levitsky wrote:
> 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...
> 

OK, fair enough.

-- 
Dmitry
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