On Fri, 25 Sep 2009, B.Vinai Kumar wrote: > Hi Alan, > > I got the device working now. > > I am using this device with USB over IP application, it was the > virtual host controller driver not reporting the actual length upon the > completion of control IN transaction to application driver when > zero length data is received from the device. > > --> The application driver sends a control OUT transaction to the device > once it receives the reply of control IN transaction with actual length > zero. > This was missing earlier & the device is not capturing the image. > > Thanks for your inputs. > > From your previous reply, I have a doubt, > > > The interface descriptor says that there are no endpoints, > > but it is followed by an endpoint descriptor anyway. > > In USB 2.0 it is said that if bNumEndpoints is zero then > that interface uses only default control pipe. So that's why > it may be sending the endpoint zero descriptor (though it is > not used by linux core while parsing the config desc). The USB 2.0 spec also says that endpoint 0 should not be included among the endpoint descriptors for an interface. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
