On Tue, 24 Oct 2006, Bruno Vétel wrote:

> On Tue, 2006-10-24 at 14:19 -0400, Alan Stern wrote:
> > On Tue, 24 Oct 2006, Bruno Vétel wrote:
> > 
> > > Hello
> > > 
> > > I am looking for a samples of a compound device driver. Has anyone a
> > > pointer to give me.
> > 
> > A compound device is really nothing more than a hub plus some other
> > devices permanently attached to it, all wrapped up in a single package.  
> > No special drivers are needed.
> 
> Sorry, I was not clear. It need to develop a compound gadget driver and
> I did not found a gadget hub driver. I read somewhere that the best way
> is to develolop a gadget compound device. It is for this that I need a
> pointer

There aren't any gadget hub drivers.  Not that this should make any
difference; you can just buy a regular hub and use it.  There's no need to
write a driver for it since hubs come with perfectly good firmware already
installed.

Almost by definition there is no such thing as a compound gadget driver.  
A "compound gadget" would actually be a hub plus several normal gadgets,
all in a single box.  Each of the normal gadgets would run a normal gadget
driver.

Are you sure you're not thinking of a "composite" gadget instead?  A
composite USB device has multiple functions available in different
interfaces or configurations.  A compound device, by contrast, has
multiple functions available in different internal sub-devices.

Nobody has ever posted a composite gadget driver, but there's no reason 
you couldn't go ahead and write one yourself.

Alan Stern


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