linux-kernel - Re: [PATCH] usb: add new usb gadget for ACM and mass storage

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Date:	Fri, 16 Sep 2011 17:22:32 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
cc:	Greg KH <gregkh@...e.de>, Michal Nazarewicz <mina86@...a86.com>,
	Klaus Schwarzkopf <schwarzkopf@...sortherm.de>, <balbi@...com>,
	<linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] usb: add new usb gadget for ACM and mass storage

On Fri, 16 Sep 2011, Sebastian Andrzej Siewior wrote:

> * Greg KH | 2011-09-09 11:43:54 [-0700]:
> 
> >So we can expect more patches like this adding all of the possible
> >permutations of the different gadget devices?
> >
> >If so, ick, I thought that the work that was done was to prevent this
> >from happening, oh well :(
> 
> Would it be possible to come up with a gadget-hub driver which can have
> multiple gadget attached? This should get rid of this kind of gadget
> drivers, right?

Instead of implementing a hub, it might be possible to redo the 
composite driver in such a way that the individual function drivers are 
added as separate modules at runtime, rather than all bound together at 
compile time.

The details would be tricky, but I think it could be done.  One 
important point is that somehow you have to inform the composite core 
when all the function drivers have been loaded and initialized -- 
otherwise there's no way to tell when it's safe to enable the pull-ups 
and connect to the host.

Alan Stern

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