Access rights for specific USB device in /dev? (Was: Ippon UPS over USB (ugen1.2: <Cypress Semiconductor> at usbus1)?)

[freebsd at johnea.net]

On 2011-08-02 16:30, Lev Serebryakov wrote:
> Hello, Freebsd-usb.
> You wrote 3 ������� 2011 �., 2:37:09:
>
>>    Now I have another question: devfs(8) uses device types or paths to
>> specify access rules for /dev/*, which is bad idea for USB device, as
>> it will change path when cable will be re-attached to another port. Is
>> here any method to set owner:group of device node by VID/PID or ID
>> string or something like this?
>   I've tried to add "attach" rule to devd.conf, but here is one
> problem: $device-name is "ugen1.2" for example, and "devfs" change
> owner and permissions on /dev/ugen1.2, but it is only "symbolic link"
> and real device is "/dev/usb/1.2.0" in such case -- as result, owner
> and permissions on real device stay unchanged and "blazer_usb" can not
> access it again :(
>

Hi Lev,

This has some info on permissions:

http://people.freebsd.org/~thierry/nut_FreeBSD_HowTo.txt

hth...

johnea