Hello,
in the course of udevifying X.org, we determined that we need a
reliable way of detecting whether an input device is a touchpad (and
thus should be driven by -synaptics instead of -evdev). Our first
attempt [1] uses ATTRS{protocol}=="AlpsPS/2", but that misses a lot of
devices using other protocols.
So at least for now it would be better to actually check the
inputN/capabilities/{key,abs} flags in sysfs, like hal used to do.
I took the hal code as a basis and created an input_id program [2]
which detects the class of a device (since bit testing in udev rules
isn't possible). We can then use this in X.org's and potentially other
rules.
Questions:
* Should we maintain this in udev proper, in extras/input_id/ ? (My
preferred solution, since it's not really X.org specific). I'm up
for maintaining it.
* Should udev itself install rules which call this, or should we just
provide it for other packages to use? Calling it in udev itself
feels a little more robust to me, but it would mean that the
probing would be done in vain on systems which use X.org with hal.
Something like
ACTION=="add|change", SUBSYSTEM=="input", ENV{ID_INPUT}=="", IMPORT{program}="input_id /sys/%p"
(I'll drop the /sys/ and move it into input_id.c before committing)
Thanks in advance for comments,
Martin
On my system:
$ gcc -o input_id input_id.c
$ for i in /sys/class/input/input*; do echo -n "--- $i: "; cat $i/name; ./input_id $i; done
--- /sys/class/input/input0: Lid Switch
ID_INPUT=1
--- /sys/class/input/input1: Power Button
ID_INPUT=1
ID_INPUT_KEY=1
--- /sys/class/input/input10: Dell WMI hotkeys
ID_INPUT=1
ID_INPUT_KEY=1
--- /sys/class/input/input11: HDA Intel Line In at Ext Left Jack
ID_INPUT=1
--- /sys/class/input/input12: HDA Intel HP Out at Ext Left Jack
ID_INPUT=1
--- /sys/class/input/input13: DualPoint Stick
ID_INPUT=1
ID_INPUT_MOUSE=1
--- /sys/class/input/input14: AlpsPS/2 ALPS DualPoint TouchPad
ID_INPUT=1
ID_INPUT_MOUSE=1
ID_INPUT_TOUCHPAD=1
--- /sys/class/input/input2: Sleep Button
ID_INPUT=1
ID_INPUT_KEY=1
--- /sys/class/input/input3: Macintosh mouse button emulation
ID_INPUT=1
ID_INPUT_MOUSE=1
--- /sys/class/input/input4: AT Translated Set 2 keyboard
ID_INPUT=1
ID_INPUT_KEY=1
ID_INPUT_KEYBOARD=1
--- /sys/class/input/input5: Video Bus
ID_INPUT=1
ID_INPUT_KEY=1
--- /sys/class/input/input6: Video Bus
ID_INPUT=1
ID_INPUT_KEY=1
--- /sys/class/input/input7: HID 05f3:0007
ID_INPUT=1
ID_INPUT_KEY=1
ID_INPUT_KEYBOARD=1
##### ^^^ This is an USB keyboard, so this is correct.
--- /sys/class/input/input8: HID 05f3:0007
ID_INPUT=1
ID_INPUT_KEY=1
--- /sys/class/input/input9: Logitech USB-PS/2 Optical Mouse
ID_INPUT=1
ID_INPUT_MOUSE=1
[1] http://people.canonical.com/~pitti/tmp/66-xorg-synaptics.rules
[2] http://people.canonical.com/~pitti/tmp/input_id.c
--
Martin Pitt | http://www.piware.de
Ubuntu Developer (www.ubuntu.com) | Debian Developer (www.debian.org)
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