Re: composite gadget support

On Wed, 31 Oct 2007, Ramirez-Ortiz, Jorge wrote:

> Um...the devices you are referring to when using /sys/bus/sub are the
> host controllers, am I right?

You are wrong.  The device under /sys/bus/usb/ is the USB device (or
gadget) whose configuration you want to change.  (However the
/sys/bus/usb/ directory itself is located on the host, not the gadget,
if that's what you mean.)

> So if I am understanding all of this correctly, the host controller
> would be telling the gadget what interface/function it needs....

More accurately, the host tells the gadget which configuration to 
install, by sending it a Set-Configuration request.

> Somehow  I was expecting the gadget (in this case a printer with a nice
> GUI) to be able to present different interfaces to the hosts depending
> on a user selection from within  

Within what?

>(so the gadget would be chosing what
> functionality to present at a given moment in time)....it seemed
> reasonable...

The USB specification states that these choices are made by the host,
not by the peripheral.

> Please could you confirm that I am in the 'right' track?

It's kind of hard to say, but I suspect you aren't.

Alan Stern


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