I just sent this to the Xorg m-l. Discuss it here or there, I'm subscribed to
Adding a wacom module to this daemon is something that's on my list while I
continue the development.
>Subject: [RFC] XInput hotplugger daemon
> Ever since the hotplugging code was merged into master I've really wanted
> to be able to just plug in my Wacom tablet to the computer and just have
> the needed InputDevices defined. For the mouse and keyboard HAL and some
> fdi-rules does the trick. But Wacom tablets has turned out to be something
> completely different, see also . We've also had a pretty long discussion
> about this over at the linuxwacom list , and I think we agreed to
> disagree until we could actually show how it would work...
> So I've realised that there is a need for another way of hotpluging the
> connected devices than through the internal HAL-support in the Xserver, an
> external hotplugger daemon. This has been mentioned as a possible way to
> solve hotplugging in some posts here, but my searches for someone making a
> program like this has turned up empty.
> So following the argumentation I made in  I've written a little daemon
> that listens to HAL-signals and adds/removes InputDevices as they come and
> go. The first try was desiged to work in parallell with the internal
> HAL-support. But I couldn't figure out how to identify which devices had
> which driver in the Xserver, so the second try  takes complete control.
> i.e. turn off the HAL-code in the Xserver if you want to try this (the
> configuration option should be enough)...
> Currently it does only what the internal HAL-support does today, nothing
> more. But my idea is to add loadable module support for additional types of
> devices, better D-Bus support so the connected devices can be managed via
> the session bus, .... More stuff will come, but I'd appreciate comments
> about the main concept. I hope the D-Bus interface can be an interface that
> can be used by other applications (configuration tools/tray apps/...) to
> monitor/manage the connected devices/defined InputDevices.
> Some key concepts/...:
> - Uses dbus-glib-1 as library towards the system and session D-Bus
> - Has white/black-lists for HAL-paths to ignore and X devices to leave
> (statically defined devices in the xorg.conf)
> - Two layers, the physical devices and InputDevices are separated for
> those devices with a 1:n device:InputDevice mapping 
> - D-Bus interface to monitor/manage the connected devices and
> InputDevices. - Takes complete control of the configured InputDevices,
> unless an InputDevice is blacklisted it is removed at startup and added if
> HAL has an entry for the hardware (with appropriate parameters for it).
> - Should be started when [gkx]dm starts (without connection to a session
> bus), and restarted when the user log in (with connection to the session
> So what do you think? I need something that solves the hotplugging issue
> with my tablet, and I think this is one way to solve it.
>  http://lists.freedesktop.org/archives/xorg/2008-February/032659.html
>.html  git://people.freedesktop.org/~wigge/xinputhotplugd