Re: joypad naming problems

[Andrey Borzenkov <arvidjaar@mail.ru>]

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On Saturday 23 September 2006 16:24, Ljubomir Simin wrote:
> Hi,
>
> I have problem with setting udev rules. After reading
> http://reactivated.net/writing_udev_rules.html I've decided to ask here for
> help, as this mailing list is noticed under "support". Sorry if this is not
> suitable place for this.
>
> I have dedicated gaming machine which is operated only with 2 joypads. I
> want to make sure that no matter when or where the joypads are plugged in,
> they always get the same device names. This is crucial for numerous
> emulators I've set, which thinks js0 = first joypad, js1 = second joypad,
> and so on. Most of them are not configurable enough to use custom device
> names (so I can not use symlinks).
> Currently, joypads get names "input/js0" and "input/js1" at startup.
> However, when I unplug the first one, and plug it again, it becomes
> "input/js2" thus making most programs and emulators useless. So I want to
> "bound" it to input/js0. To achieve this I've created rules file:
>
> mythtv@revstation:~$ cat /etc/udev/rules.d/10-local.rules
> SYSFS{idVendor}="046d", SYSFS{idProduct}="0216", NAME="input/js0",
> MODE="666", SYMLINK+="js0"
> SYSFS{idVendor}="06a3", SYSFS{idProduct}="0109", NAME="input/js1",
> MODE="666", SYMLINK+="js1"
>
> (SYMLINK is there "just to be sure". The most important part is NAME)
>

Which version of udev? Which version of kernel?

> However, it seems they're not enough. Before unplugging situation looks
> like this:
>
> mythtv@revstation:~$ udevinfo -q all -n /dev/input/js0
> P: /class/input/input1/js0
> N: input/js0
>

please show

udevinfo -a -p /sys/class/input/input1/js0

> mythtv@revstation:~$ udevtest /class/input/input1/js0 input
> main: looking at device '/class/input/input1/js0' from subsystem 'input'
> main: opened class_dev->name='js0'
> udev_rules_get_name: rule applied, 'js0' becomes 'input/js0'
> run_program: '/sbin/grepmap --udev'
> run_program: '/sbin/grepmap' (stdout) 'evdev'
> run_program: '/sbin/grepmap' (stdout) 'evbug'
> run_program: '/sbin/grepmap' returned with status 0
> match_rule: 1 untrusted character(s) replaced
> create_node: creating device node '/dev/input/js0', major = '13', minor > '0', mode = '0660', uid = '0', gid = '46'
>
> But after re-plugging the first joypad:
>
> mythtv@revstation:~$ udevtest /class/input/input1/js0 input
> main: looking at device '/class/input/input1/js0' from subsystem 'input'
> main: sysfs_open_class_device_path failed
> mythtv@revstation:~$
>
> It didn't get js0, it got js2 again:
>
> mythtv@revstation:~$ udevinfo -q all -n /dev/input/js0
> no record for 'input/js0' in database
>
> mythtv@revstation:~$ udevinfo -q all -n /dev/input/js2
> P: /class/input/input5/js2
> N: input/js2
>
> mythtv@revstation:~$ udevtest /class/input/input5/js2 input
> main: looking at device '/class/input/input5/js2' from subsystem 'input'
> main: opened class_dev->name='js2'
> udev_rules_get_name: rule applied, 'js2' becomes 'input/js2'
> run_program: '/sbin/grepmap --udev'
> run_program: '/sbin/grepmap' (stdout) 'evdev'
> run_program: '/sbin/grepmap' (stdout) 'evbug'
> run_program: '/sbin/grepmap' returned with status 0
> match_rule: 1 untrusted character(s) replaced
> create_node: creating device node '/dev/input/js2', major = '13', minor > '2', mode = '0660', uid = '0', gid = '46'
>
>
> I have this line in /etc/udev/rules.d/20-names.rules (provided by default
> with Ubuntu). Is it guilty? When I comment it out, input/js* files does not
> get created during startup, and no joysticks work.
>

yes it will override your rule in any case; but atm your rule does not even 
kick in.

- -andrey 

> mythtv@revstation:~$ cat /etc/udev/rules.d/20-names.rules |grep js
> KERNEL="js[0-9]*",                     NAME="input/%k"
>
>
> What is wrong with my setup? How can I force joysticks to always have same
> device names?
>
>
> Best regards,
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