number of /dev/usb nodes

Bernd Walter ticso at
Sun Jun 8 13:42:39 UTC 2008

On Sat, Jun 07, 2008 at 01:18:41PM -0400, Chuck Robey wrote:
> Hash: SHA1
> I can't seem to find how many /dev/usbN bus devices there can be.  I'm writing
> some code that scans them all looking for anything that has my device, but I
> while I know to start at usb0, just how high do I go?  There seem to be 128
> device minors, is that the number?  (from dev/usb/usb.h)

There shouldn't be a limit anymore.
I can't see any definition of 128 in usb.h that limits the number of
The major/minor differenciation is long time ago.
You must be looking at old code.

B.Walter <bernd at>
Modbus/TCP Ethernet I/O Baugruppen, ARM basierte FreeBSD Rechner uvm.

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