Need persistent node to USB port naming

["Stephen Morgan" <stephenm@glw.com>]

Hello all,

I'm converting a driver for a USB device from Linux 2.4 to 2.6.  The device
is embedded and the host is an embedded PC.  There may be as many as 6
identical devices attached.  The only way they are differentiated is by the
USB port they're plugged into - the cabling is fixed.  So, when the user
asks for 'foo_dev0' for instance, he wants the first USB device - 'foo_dev1'
should give him the 2nd device, etc.

Under 2.4, I created six nodes, assigning them minors 192 thru 197.  In the
driver's probe(), I used usb_make_path to create an index to the device.
For file ops, I used (MINOR(inode_p->i_rdev) - 192) to get an index from the
node.

So far, under 2.6, the best approach I can see is to create a udev .rules
file to make the nodes, like so: BUS="usb", PLACE="1-1", NAME="usb/foo_dev0"

Is this the best way to go, or have I overlooked something simpler?

Thanks

Stephen Morgan



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