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

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Hi,

On Fri, Dec 11, 2009 at 10:59:29AM -0800, Greg KH wrote:

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

The Windows ACM driver has no class or device bindings at all, it is
shipped without a .inf file. Individual vendors then ship a .inf
referencing the driver, which then accepts any device it is bound to,
even if it is not really an ACM device (AFAIK, it accepts anything that
either has an interface of Communications class or the standard layout
with 1 control, 1 interrupt, 2 bulk endpoints, much like Linux's
usbserial driver.

   Simon
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