Re: How do assign specific nodes to 2-port USB-to-serial adapter?

[Oli <ocomber@cmedresearch.com>]

Hey J,

On Tue, 2005-10-18 at 17:41 -0500, J McBane wrote:
> Greetings,
> 
> My USB-to-serial adapter (gives me 2 serial ports) is currently being named
> ttyUSB0 and ttyUSB1.  I would like to change the name of the nodes to test0 and
> test1, for example.
> 
> I understand how to normally accomplish this, except this device shares the same
> serial number and ID, according to "udevinfo -a -p /sys/class/tty/ttyUSB0" and
> "udevinfo -a -p /sys/class/tty/ttyUSB1".
> 
> I don't know how to tell udev/hotplug how to differentiate between the two
> serial ports.
> 
> The best I can come up with is the following, which only gives me a test0 node
> (and no ttyUSB nodes):
> BUS="usb", SYSFS{serial}="V32408622-0", NAME="test0"
> BUS="usb", SYSFS{serial}="V32408622-0", NAME="test1"
> 

You could try a little something like this:

BUS="usb", SYSFS{serial}="V32408622-0", NAME="%k", SYMLINK="test%n"

Or if you're feeling cheeky, maybe you could:

BUS="usb", SYSFS{serial}="V32408622-0", NAME="%k", SYMLINK="%s{serial}%
n"

With a bit of digging around in sysfs, I'm sure you could find something
more meaningful to put in the symlink name than 'serial'.  

You're probably being a bit restrictive by putting the whole serial in
there.  It'd be better to use something like model number.

Have a look at the udev manual page.  All sorts of fun stuff in
there :0)

Check the version of udev you're running too - I know the '%s' stuff was
patched a bit some time ago - v0.75ish, IIRC ?

Also note that the rules will (I think) stop at the first match.  This
is why your test1 device never gets created.

Hope this helps.

Cheers,
-Oli




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