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Date: Wed, 18 May 2011 05:53:16 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: Hans Petter Selasky <hselasky@c2i.net>
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Cc: Charles Sprickman <spork@bway.net>, freebsd-usb@freebsd.org
Subject: Re: usb serial port device naming
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On Wed, 18 May 2011, Hans Petter Selasky wrote:

> On Tuesday 17 May 2011 18:19:25 Christopher Hilton wrote:
>> On May 17, 2011, at 5:18 AM, Hans Petter Selasky wrote:
>>> Hi,
>>>
>>> If you run 8-stable, there is some information you can lookup via sysctls
>>> of the USB devices, which tells you which port belongs to which device.
>>>
>>> Use the serial number to identify your device, if your device has such a
>>> value.
>>>
>>> usbconfig -d X.Y dump_device_desc
>>
>> Are you suggesting that one could use this information to config devd and
>> perhaps automatically create a link to the correct port at USB attach
>> time? I ask because I anticipate having to deal with this situation in the
>> future.
>>
>
> Yes, I think that is the idea. Currently this functionality is only introduced
> in 8-stable and 9-current.

If the serial number is available to devd, it might be possible to do 
that already.  On attach, create a specially-named link to the device 
depending on the serial number.