Re: [Qemu-devel] usb and qemu

[Lonnie Mendez]

On Wednesday 10 August 2005 5:10 pm, Mark Williamson wrote:
> > > Isn't there a USB patch floating around somewhere (emulates OHCI in the
> > > guest)?
> >
> > Yes, but noone's written the code to wire it up to host devices. AFAIK it
> > currently emulates the host controller and not much else.
> 
> Oh, OK that makes sense.
> 
> > Using the usb-over-ip protocol mentioned above seems like a nice way of
> > getting it to talk to host USB devices in a host-independent way.
> 
> Actually that'd be a fairly neat trick...  As an alternative, IIRC there's a 
> user space API for writing USB drivers under Linux - using that you could 
get 
> access to both local and remote (IP encapsulated) USB devices, albeit not in 
> a cross-platform (host-wise) way.

   That would be called libusb.  The libusb V1_0_DEVEL branch would be the 
prime candidate for this "wiring up", but is however incomplete.  libusb 
(<=0.1.10a) does not support asynchronous communications and does not have an 
api to deal with isochronous usb transfers as well.  I've been messing around 
with the ohci-hc / libusb 1.0 connection, albeit slowly.