joypad naming problems

joypad naming problems

[Ljubomir Simin]

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)

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

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.

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,
-- 
Ljubomir Simin 
Registered Linux User #351181
http://counter.li.org 

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Re: joypad naming problems

[Andrey Borzenkov]

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Hash: SHA1

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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