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SubjectRe: USB device allocation
On Tue, Oct 05, 1999, Riley Williams <rhw@MemAlpha.CX> wrote:
> Hi Pavel.
>
> > USB is getting into stage where it is actually usefull. And I've
> > experienced first clashes with other devices. Therefore, it is
> > time to allocate entries.
>
> > Previous numbers are unusable :-(: their either crash with
> > existing device, or there's only convient room for one such
> > device where around 16 are needed.
>
> How many really need 16?
>
> > XXX char USB devices
> > 0 = /dev/usblp0 Printers connected via usb
> > ...
> > 15 = /dev/usblp15
> > 16 = /dev/usbmouse0 USB mouse
> > ...
> > 31 = /dev/usbmouse15
> > 32 = /dev/ezusb0 USB firmware downloader
> > ...
> > 63 = /dev/ezusb15
> > 64 = /dev/usbscanner0 USB HP scanner
> > ...
> > 95 = /dev/usbscanner15
> > 128 = /dev/ttyACM0 USB modem
> > ...
> > 255 = /dev/ttyACM127
>
> Let's be a bit more reasonable...
>
> 0 => 31 USB Serial (Mouse or Modem)
> 32 => 47 USB Printers
> 48 => 63 USB Scanners
> 64 => 79 USB Cameras
> 80 => 95 USB Keyboards
> 96 => 111 USB firmware downloaders
> 112 => 239 Reserved for future definition
> 240 => 255 USB Experimental
>
> Remember also that the names are reasonably irrelevant, and only the
> node numbers actually matter.

For the immediate need of some sort of defination, I think this looks
reasonable.

However, we do need to continue trying to find a solution to other
problems PnP devices have, but of course not on linux-kernel :)

JE


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