ID_CLASS joystick

[Anssi Hannula <anssi.hannula@gmail.com>]

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Hi!

I'd like to have "joystick" (or maybe "game_controller") added to the
possible values of ID_CLASS. The possible values are currently "spkr",
"kbd", "mouse", "ir".

Joydev (drivers/input/joydev.c) considers a device to be a joystick when
it has (ABS_X || ABS_WHEEL || ABS_THROTTLE) && !BTN_TOUCH.

Modalias has the necessary info. Example modalias for my sw p2 joystick:
MODALIAS=input:b0003v045Ep0038e0108-e0,1,3,k120,121,122,123,124,125,126,127,ra0,1,5,6,10,11,mlsfw

ABS caps are after "a" and KEY caps are after "k". ABS_X=0, ABS_WHEEL=8,
ABS_THROTTLE=6, BTN_TOUCH=14A.

Then we get the following rule to add into 60-persistent-input.rules:
SYSFS{modalias}=="input:*-*a[068],*|input:*-*a*,[68],*m*",
SYSFS{modalias}!="input:*-*k*14A,*r*", ENV{ID_CLASS}="joystick"

Another possibility would be to match the capabilites flags in sysfs,
but they're bitfields. For example the device in the above example has
"30063" in /capabilities/abs which means 110000000001100011. I don't
know how to parse that easily.

I need this "joystick" value, because it would rather cleanly allow to
easily differentiate joystick evdev device nodes, so that they can be
chowned to the console user by pam.

Patch is attached. Please comment.

-- 
Anssi Hannula


[-- Attachment #2: udev-096-joystick-class.patch --]
[-- Type: text/x-patch, Size: 697 bytes --]

diff -Nur -x '*~' udev-096/etc/udev/60-persistent-input.rules udev-096-fi/etc/udev/60-persistent-input.rules
--- udev-096/etc/udev/60-persistent-input.rules	2006-07-09 22:48:19.000000000 +0300
+++ udev-096-fi/etc/udev/60-persistent-input.rules	2006-08-06 23:36:10.000000000 +0300
@@ -2,6 +2,9 @@
 SUBSYSTEM!="input", GOTO="persistent_input_end"
 KERNEL=="input[0-9]*", GOTO="persistent_input_end"
 
+# joystick devices
+SYSFS{modalias}=="input:*-*a[068],*|input:*-*a*,[68],*m*", SYSFS{modalias}!="input:*-*k*14A,*r*", ENV{ID_CLASS}="joystick"
+
 # usb devices
 BUS=="usb", IMPORT{program}="usb_id -x"
 BUS=="usb", SYSFS{bInterfaceClass}=="03", SYSFS{bInterfaceProtocol}=="01", ENV{ID_CLASS}="kbd"

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