Re: USB CDC ACM -- why is bProtocol required to be nonzero?

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On Fri, Dec 11, 2009 at 07:44:21PM +0100, Oliver Neukum wrote:
> Am Freitag, 11. Dezember 2009 18:00:00 schrieb Simon Richter:
> > > Does that follow the cdc-acm spec?  That's what we need to follow here.
> > 
> > From how I interpret the spec, it does; I was hoping on input from
> > someone who was involved in the decision to implement it the current
> > way, as they might know better if there are devices we actually want to
> > ignore (i.e. from a practical point of view).
> 
> The cdc-acm driver was supposed to support modems, defining modems
> as devices that implement the AT command set.
> One can argue that a serial interface may or may not be a modem.

Exactly.

Also, does the windows cdc acm driver accept devices with
USB_CDC_PROTO_NONE?

thanks,

greg k-h
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