On Tue, 10 Nov 2009, Ramya Desai wrote: > Dear Experts, > > How can my class driver (UASP) knows that the underlying HCD is xHCI. > I wanted to know this because, I have to communicate differently with > xHCI driver than with eHCI. I don't think there is any way to tell what the underlying HCD is. But you are asking the wrong question. You don't really care which HCD is being used. What you really want to know is the device's speed. You can check that easily enough: if (udev->speed == USB_SPEED_SUPER) ... After all, if the device is running at full speed then it doesn't matter whether the host controller is UHCI, EHCI, or xHCI. 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
