Re: [linux-usb] Re: USB device allocation

Matthew Dharm (mdharm@one-eyed-alien.net)
Wed, 6 Oct 1999 16:24:13 -0700 (PDT)

On Wed, 6 Oct 1999, Gregory P. Smith wrote:

> > My understanding (and maybe I'm smoking crack here) is that there are only
> > 127 devices allowed on a USB tree, and minor numbers go all the way up to
> > 255. So, why not simply have devices accessed by their device number?
>
> USB device != /dev device
>
> A USB device can have lots of interfaces and functions on it. Plus you
> can have multiple USB busses each with lots of devices.

That's a given. We might need kernel compile options to define how many
major numbers are used (and therefore how large the pool is).

Regardless of the translation between USB devices and /dev devices, we
still need some way to present these things in /dev -- perhaps
/dev/usb[0-255] is simply a particular interface on a particular device?
The main thrust of the idea still stands.

Matt

-- 
Matthew Dharm                                         InterNIC: MDD94
Engineer, Qualcomm, Inc.                              Cell: (619) 890-6943
Home: mdharm@one-eyed-alien.net                       Home: (858) 689-1908
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I want my GPFs!!!
					-- Stef
User Friendly, 11/9/1998




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