[systemd-devel] UDEV rule not matching...why?

[Andrei Borzenkov]

09.10.2024 17:02, Daniel Spannbauer wrote:
> Hello,
> 
> 
> thanks for the response.
> 
> My rule is in "55-my-rules.rules"
> 

For SUBSYSTEM=="tty" the usb_id is called in 60-serial.rules.

> I also tried it with "ATTRS{bInterfaceNumber}" instead of the
> "ENV{ID_USB_INTERFACE_NUM} ", but also no success.
> 
> 
> Regards
> 
> 
> Daniel
> 
> Am 09.10.2024 um 15:59 schrieb Mantas Mikulėnas:
>> Did you place your rules in the correct order?
>> ENV{ID_USB_INTERFACE_NUM} is set by usb_id in 50-udev-default.rules,

Only for SUBSYSTEM=="usb"

>> so it would be available in 60-foo.rules but not in 20-foo.
>>
>> On Wed, Oct 9, 2024, 16:29 Daniel Spannbauer <ds at marco.de> wrote:
>>
>>      Hello,
>>
>>
>>      our own device (see attachement for udevadm info --attribute-walk)
>>      should have a symlink.
>>
>>      Therefore I create the following udev rule:
>>
>>        SUBSYSTEM=="tty", KERNEL=="ttyACM[0-9]*",
>>      ENV{ID_USB_INTERFACE_NUM}=="02", ATTRS{idVendor}=="1dfb",
>>      ATTRS{idProduct}=="0010", SYMLINK+="2a"
>>
>>      But a "udevadm test /sys/class/tty/ttyACM1" shows, that there is no
>>      match, a symlink is not created. If I remofe the "ENV" pattern,
>>      the rule
>>      is working.
>>
>>      Any idea, whats wrong here?
>>
>>      System is opensuse LEAP 15.5, RPM-VErsion of UDEV is
>>      249.16-150400.8.25.7
>>
>>
>>      Best regards
>>
>>
>>      Daniel
>>
>>
>>      --
>>      Daniel Spannbauer  Systemadministration
>>      marco Systemanalyse und Entwicklung GmbH      Tel   +49 8333
>>      9233-27 Fax -11
>>      Rechbergstr. 4-6, D 87727 Babenhausen         Mobil +49 171 4033220
>>      https://www.marco.de                         Email ds at marco.de
>>      Geschäftsführer Martin Reuter, Torsten Lukas  HRB 171775
>>      Amtsgericht München
>>