USB serial devices with more than one interface

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On Sep 29, 2009, at 1:31 PM, Greg KH wrote:

> If it is more complex, with multiple tty ports for a single USB
> endpoint, then you might want to look at the edgeport driver, but
> clean
> it up a bunch.

I've started my driver based on the edgeport code and so far it's
looking quite promising, except for one thing…  My device has
descriptors based on the CDC-ACM scheme: in other words two interfaces
for each channel, one with an interrupt IN endpoint for notifications,
and another with a bulk IN and bulk OUT pair.  Do you have any
suggestions on how I can get the USB serial driver infrastructure to
play nicely with my descriptors?  I see that there is a hack in place
to support PL2303 devices that have some similar problem, but I'd like
to avoid that approach if at all possible.

Thanks,

Rob.

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