linux-kernel - Re: synaptics touchpad doesn't click

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Date:	Wed, 16 Dec 2009 08:14:15 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	Alex Chiang <achiang@...com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-input@...r.kernel.org
Subject: Re: synaptics touchpad doesn't click

At Tue, 15 Dec 2009 22:56:53 -0800,
Dmitry Torokhov wrote:
> 
> On Wed, Dec 16, 2009 at 07:50:54AM +0100, Takashi Iwai wrote:
> > At Tue, 15 Dec 2009 18:59:34 -0800,
> > Dmitry Torokhov wrote:
> > > 
> > > On Tue, Dec 15, 2009 at 06:05:06PM -0700, Alex Chiang wrote:
> > > > * Dmitry Torokhov <dmitry.torokhov@...il.com>:
> > > > >
> > > > > The updated patch is below.
> > > > > 
> > > > > -- 
> > > > > Dmitry
> > > > 
> > > > Should I test this one or wait one more iteration to address
> > > > Takashi's last comments?
> > > > 
> > > 
> > > Actually I think we took the wrong direction with the original patch and
> > > we should do what other buttonless devices (bcm5974) do: report touchpad
> > > click as left button and have Synaptics X driver provide enhanced
> > > support. This way we can have both modes (ClickZones and ClickButtons)
> > > and users will get to chose (provided that someone takes time to add
> > > that support to Synaptics driver of course ;) ).
> > 
> > My concern is, still, how would you identify this device.  Will you
> > extend also some ioctls to expose caps and extcaps?  Otherwise it's
> > difficult to identify this device automatically from the user-space.
> > 
> 
> No.. Synaptics without right button == ClickPad.

So, is there only Clickpad device that has a single button?
No other option?

> > The user-space can know that it's button-less, yes.  But, how can it
> > know whether the device should be emulated via ClickZone?
> > We can use a driver option to x11 synaptics driver for that, as I
> > already sent you another patch.  However, the driver option is
> > nowadays not preferred because xorg.conf is being dead on new
> > systems...
> 
> Driver still takes options, from UDEV/HAL. We could pick one behavior
> by default and ovverride, by box vendor/model (DMI).
> 
> > 
> > Or maybe HAL (or whatever upcoming one) can check the vendor/product
> > id of the machine (not the device) to provide the information.  OTOH
> > this will also need frequent updates.
> 
> Hopefully vendors won;t be flip/flopping between ClickZone and
> ClickButtons too much. Still option is better than hardcoding ClickZone
> for everyone.

Yeah, I agree that hard-coding isn't good, and that's why I first
posted separated patches.  OTOH, the kernel-side hack makes the device
working *as is* even without changing anything else.


Takashi
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