RFC: blow Ethernet-over-USB into a module

[Gilles Casse]

Werner Almesberger wrote:
> 
> But all these solutions still need protocol stack changes on both ends,
> right ? That makes them fairly unattractive unless it's something all
> relevant hosts implement ...
> 

I have not yet had the chance to use compound gadgets. AIUI, a specific 
host driver is needed for composite gadgets, not for compound gadgets.

This paragraph (4.8.2.2) from the USB2.0 spec defines compound devices:

"A function is a USB device that is able to transmit or receive data or 
control information over the bus. A function is typically implemented as 
a separate peripheral device with a cable that plugs into a port on a 
hub. However, a physical package may implement multiple functions and an 
embedded hub with a single USB cable. This is known as a compound 
device. A compound device appears to the host as a hub with one or more 
non-removable USB devices."


Gilles