From mboxrd@z Thu Jan  1 00:00:00 1970
From: Danny Kukawka <danny.kukawka@web.de>
Date: Wed, 27 Aug 2008 20:54:18 +0000
Subject: Re: [PATCH] generate by-id links for Wacom USB TabletPC devices
Message-Id: <200808272254.19202.danny.kukawka@web.de>
List-Id: <linux-hotplug.vger.kernel.org>
References: <200808272215.12054.danny.kukawka@web.de>
In-Reply-To: <200808272215.12054.danny.kukawka@web.de>
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To: linux-hotplug@vger.kernel.org

On Mittwoch, 27. August 2008, Kay Sievers wrote:
> On Wed, 2008-08-27 at 22:15 +0200, Danny Kukawka wrote:
> > From: Danny Kukawka <danny.kukawka@web.de>
> > Subject: generate by-id links for Wacom USB TabletPC devices
> >
> > Generate these persistent links for Wacom USB TabletPC input devices
> > under /dev/input/by-id/ :
> >
> >  * usb-Tablet_ISD-V4-event-stylus
> >  * usb-Tablet_ISD-V4-stylus
> >  * usb-Tablet_ISD-V4-event-touch
> >  * usb-Tablet_ISD-V4-touch
>
> Where do these links point to? Care to run "tree"?

For example (sorry, can't run tree, since I don't have a machine available 
with these devices) :

ls -lha /dev/input/by-id 

lrwxrwxrwx 1 root root 9 2008-08-25 12:44 usb-Tablet_ISD-V4-event-stylus ->
../event6
lrwxrwxrwx 1 root root 9 2008-08-25 12:44 usb-Tablet_ISD-V4-event-touch ->
../event7
lrwxrwxrwx 1 root root 9 2008-08-25 12:44 usb-Tablet_ISD-V4-stylus ->
../mouse2
lrwxrwxrwx 1 root root 9 2008-08-25 12:44 usb-Tablet_ISD-V4-touch ->
../mouse3

> > +DRIVERS="wacom", ENV{ID_SERIAL}="Tablet_ISD-V4",
> > ENV{ID_CLASS}!="mouse", ENV{ID_CLASS}="touch"
>
> There are also kernel "ts" input devices, "touch" sounds like a class
> name for them. Is that in any way related to this class of kernel
> devices?

Sorry, I don't know. These devices are touchscreen devices.

> > +DRIVERS="wacom", ENV{ID_SERIAL}="Tablet_ISD-V4",
> > ENV{ID_CLASS}="mouse", ENV{ID_CLASS}="stylus"
>
> Why do we rename a detected "USB mouse class" to "stylus"?

Because it's the stylus device for this driver, it's easier for the user to 
identify the correct device with this naming.

> What's the difference between the two input devices this tablet creates?

The *-stylus devices handle the stylus and eraser input devices and the touch 
devices only the touchscreen device. But both are from the same USB device.

Danny