Multifunction USB devices
Jeff Walters
jeff at walters.name
Tue Nov 18 17:13:43 PST 2003
I have an Epson printer/scanner combo device (CX5200) which works just
fine either as a printer or as a scanner (when I add the vendor and
product codes to usbdevs and uscanner.c) but not both simultaneously.
Currently I compile ulpt and my customized uscanner as modules, and
to switch functions I power the device off, unload/load the
appropriate kernel module, and power the device back on.
I'm assuming a patch to add the CX5200 vendor/device codes to usbdevs
and uscanner.c in the way I'm doing wouldn't be accepted into CURRENT
since the resulting usage of it is a bit of a hack. Is that right?
I wouldn't mind doing work over the next few months to create proper
simultaneous support for both devices if it can be done with a
reasonable level of effort and I can find some sources of
information, and I can get some guidance from an experienced
committer or architect to help do it right the first time. Where
should I go for discussion? I'd like to learn ie. should I work to
combine ulpt and uscanner into some kind of single umulti type of
device driver, or should a virtual hub device of some kind be created
to support both ulpt and uscanner simultaneously as-is (one USB
endpoint, multiple interfaces), or should the system simply continue
searching after matching a USB device, or will this be OBE with some
other USB work going on, etc.
Thanks,
Jeff
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