Configure touchpad for touchscreen driver

[Peter Hutterer]

On Mon, May 08, 2017 at 10:39:32AM +1000, Peter Hutterer wrote:
> On Fri, May 05, 2017 at 05:30:51PM +0200, Martin Kepplinger wrote:
> > Hi,
> > 
> > I'm doing a touchscreen xorg input driver. 
> 
> First question: why? :)
> we generally discourage people from doing that, instead it's better to write
> a kernel driver and use the existing evdev/libinput drivers.
> 
> > For testing purposes, I'd like to configure my laptop's touchpad for the
> > driver to use. It's totally comparable and I've done it for other stuff
> > for rough testing. I append the evtest output below. Should be fine.
> > 
> > I'm unsure how to override all other touchpad configs in my system.
> > 
> >  * is it enough to say "MatchIsTouchpad" instead of touchscreen? There's
> > obviously only one touchpad. Ideally I think I should omit
> > "MatchIsTouchpad" and say only "Device=/dev/input/event1" or whatever
> > number it is? Would that be possible?
> 
> MatchIsTouchpad maps to the udev property ID_INPUT_TOUCHPAD, your homework
> is to figure out what MatchIsTouchscreen maps to ;)
> so doing that would be enough, but you could also add a
> MatchProduct "ETPS/2 Elantech Touchpad" to only match on that touchpad.
> 
> Don't match on device nodes as they can change during reboots.
> 
> >  * My driver config installs to /usr/local/share/X11/... Will this
> > *ever* override /usr/share/X11 configs? Even if I call it
> > "00-mydriver.conf" in /usr/local/
> 
> the server is usually configured to look into /usr/share/X11/ and /etc/X11,
> but not elsewhere. So anything you put in /usr/local is ignored. The start
> of the xorg.log should list where the server is looking for configs.
> 
> for local configurations, you're supposed to put them into /etc/ anyway,
> distribution-provided config snippets go into /usr/local.

make that:
    distribution-provided config snippets go into /usr/share.

Cheers,
   Peter