Re: [PATCH] usb/uas: only bind if the hcd supports SG

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On Wed, 11 Jan 2012, Sebastian Andrzej Siewior wrote:

> * Alan Stern | 2012-01-11 12:11:57 [-0500]:
> 
> >On Wed, 11 Jan 2012, Sebastian Andrzej Siewior wrote:
> >> Well no. Even if you override it in kernel the user still could switch
> >> it if he wants to.
> >
> >How?  If usb-storage refuses to bind to devices that support UAS, the 
> >user has no way to force it to bind.
> 
> I meant if UAS does not work _or_ he prefers BOT, he can still switch
> back to BOT.

How can the user switch back to BOT if usb-storage refuses to bind?

> >> Felipe, what is Nokia and the other people that have the multi-
> >> functional gadgets use to switch from one function to the other?
> >
> >Do those gadgets use separate _altsettings_ for BOT vs. UAS, or do they 
> >use separate _configs_?
> 
> They have both. Both configs provide the same functions, if you look at
> lsusb of the g_multi gadget:

...

The listing shows two configs: one for CDC + RNDIS and mass storage
BOT, the other for CDC ECM and mass storage BOT.  There's nothing about
UAS.

> So you need a tool to switch between storage, CDC ....

I don't understand.  Why can't you use CDC and storage at the same 
time?

Alan Stern



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