On Thu, 8 Oct 2009, vichy wrote: > Dear all: > I am looking the source code of ehci-irq, but I cannot see any > information which it will pass to "port_connect_change" when it > receive PCD interrupt. > if someone is familiar with this part of flow, please let me know. > appreciate your help, When ehci_irq() receives a PCD interrupt, it sets pcd_status and therefore calls usb_hcd_poll_rh_status(). That routine calls ehci_hub_status_data(), which reads the port status registers from the controller. The value is masked with PORT_CSC (Connect Status Change) causing a bit to be set in buf[0] or buf[1]. This bit tells the hub driver that a status change has occurred. 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
