[arch-general] finding corresponding udev rule for device

[Rodrigo Rivas]

On Thu, Jun 20, 2013 at 12:23 AM, G. Schlisio <g.schlisio at dukun.de> wrote:

> Am 19.06.2013 23:04, schrieb Damjan Georgievski:
>
>  hi all,
>>> i want to customize the udev rule, that assigns my garmin gps device
>>> with a
>>> device name. permissions need to be set different, so users have
>>> read/write
>>> access.
>>> the only problem is, that i dont know, which rule it is i have to
>>> customize.
>>> is there any way to determine, which standard udev rule applies for which
>>> device?
>>>
>> What you need to do is create your own rules file in
>> /etc/udev/rules.d/
>> something with a big number, let's say 99-my-garmin.rules
>>
>> To find out how to make the rule (I suspect it's an usb device)... first
>> run
>> `udevadm monitor` then plug the device you will get the device path
>> ... something like
>> /devices/pci0000:00/0000:00:**12.2/usb1/.../.../...
>>
>> Then run `udevadm info --attribute-walk --path=/devices/.../.../...`
>> and you'll get a bunch of properties that you can match in your own rule
>> file.
>>
>>
>>
>>  thanks for answering.
> its a serial device, which is connected via serial-to-usb-adapter.
> i created a file /etc/udev/rules.d/99-serial-**to-usb-4-garmin.rules und
> tried a lot of rules, like
> DRIVERS=="ch341-uart",ATTRS{**idVendor}=="1a86",NAME="**usbserial"
> (see http://pastie.org/8061009 for 'udevadm info ...' output)
> then i reloaded udev rules with
> 'udevadm control --reload'
> and checked result with
> 'udevadm monitor'
> i always get ttyUSB0, but not usbserial as i expected.
> am i missing something?
>

IIRC, you cannot use the "*S" properties from different parents in the same
rule. Use instead:

ATTRS{**idVendor}=="1a86", ATTRS{**idProduct}=="7523", NAME="**usbserial"

And see what happens... that should be enough.

--
Rodrigo