On Sun, 28 Jan 2007, jing xiang wrote: > Got the idea. But could we re-use the current gadget drivers in such > architecture? Is it possible to make the composite layer transparent > to the function drivers? In theory, the composite layer could get all > the descriptor/configuration/interface information from the function > drivers. Thus we could make a little modification to the gadget > drivers, and compose different kind of composite devices easily. And > for gadget/function drivers, it could either be one pure function or > combine with others to form composite device. We have tried to > implement such composite on PXA27x UDC, but met problems as mentioned > in last mail.
In principle this is possible. It's easy to see why: If you can combine two function drivers with each other to make a composite gadget, then you combine one of them with nothing, resulting in a non-composite gadget with only one function. However none of the existing drivers were written with this sort of thing in mind. They would have to be modified before they could fit into the composite-gadget scenario. So the answer to your first question is "No", and the answer to the second question is "Yes, but only if the function drivers are written properly". Alan Stern ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
