On Fri, Feb 19, 2010 at 10:14:57PM +0800, vichy wrote: > Dear all: > I am quite curious about how the control pass from ehci to uhci/ohci > or control pass from uhci/ohci to ehci when I plug fs/hs device at the > same port? It is described in the usb spec, hopefully :) > As I know, ehci and uhci/ohci will first register their pci drivers at > module init call. > Then the interrupt of uhci will keep happening. What do you mean by this? > My questions are: > 1. why the interrupt of uhci keep happening, is that defined in uhci spec? What do you mean by "keep happening"? > 2. both ehci and uhci register the same irq# and same irq function, > usb_hcd_irq, how os know to pass the correct hcd when irq happen? The driver can determine which interrupt really was for it. It's a sharred interrupt line, quite common. I'm confused as to the exact problem you are trying to resolve here. thanks, greg k-h -- 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
