On Wed, Jul 20, 2011 at 08:39:44PM +0200, Lennart Poettering wrote:
> On Wed, 20.07.11 15:16, Peter Hutterer ([email protected]) wrote:
> 
> > 
> > On Tue, Jul 19, 2011 at 11:48:26PM -0500, Favux ... wrote:
> > > Well both the new protocol 4 wacom_serial.ko and protocol 5
> > > wacom_serial5.ko are using:
> > > 
> > > ACTION=="add|change", SUBSYSTEM=="pnp", ENV{PRODUCT}='13/3d/*',
> > > ENV{NAME}=="Wacom protocol IV serial
> > > tablet",SYMLINK+="input/wacom",ENV{ID_INPUT}="1",ENV{ID_INPUT_TABLET}="1"
> > > 
> > > So maybe that needs to be looked at.
> > > 
> > > What horrendous mistakes would I be making if I used?
> > > 
> > > SUBSYSTEM="tty", SUBSYSTEMS="pnp", ATTRS{id}=="PNP0501",
> > > ENV{ID_MODEL}="Serial Wacom Tablet", ENV{ID_INPUT}="1",
> > > ENV{ID_INPUT_TABLET}="1"
> > 
> > looks good to me though I would recommend using the $attr{id} in the
> > ID_MODEL as well. Lennart?
> 
> It's really up to you, what you want to have show up in that string.
> 
> Note that ID_MODEL is usually something to show people as a pretty
> descriptive string.

see my reply here regarding the current state of ID_MODEL 
http://lists.freedesktop.org/archives/xorg-devel/2011-July/023980.html

To avoid too much confusion, I ask that you answer on the xorg-devel list
regarding these issues and then maybe reply here with a summary once we've
figured out the details. Otherwise we'll likely confuse users just on one
list.

> If you are looking for something to recognize a device with it's
> probably better to use ID_PATH for that, and hook the path_id udev
> helper into your rules for that. ID_PATH is then set to the device path
> consisting only of the "fixed" values. i.e. the PCI slot, USB port, and
> so on.

We need to recognise the tablet model (i.e. the WACf part) since it tells us
model-specific quirks that we need to look for in the models. I don't think
the path itself is needed much atm.

Cheers,
  Peter

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