Re: Associate physical device with device name

[Marc Kleine-Budde <mkl@pengutronix.de>]

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On 01/26/2018 03:38 PM, Jimmy Assarsson wrote:
> We would like to be able to associate physical (Kvaser) USB devices with
> their device names (can0 etc.).
> The interface's EAN (article number) combined with serial number, form a
> unique identifier.
> 
> It is not possible to do this from the USB descriptor. Since the serial
> number is not provided in the USB descriptor. And the same PID is reused
> for multiple EAN numbers. It is preferable with a solution that is
> independent of interface type (USB etc.), since we may support other
> devices in the future.
> 
> This is somewhat similar to '"user id" for can usb adapters',
> https://marc.info/?l=linux-can&m=146565019622100
> 
> What is the preferable way of solving this kind of problem? Is sysfs
> suitable?

Are your adaptors 100% idential? Then there is no way to tell them apart
in software. However you should be possible to write a custom udev rule
to rename the adapter depending on the physical USB-Port you are using.

Marc

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