On Tue, 24 Apr 2012, Wang YanQing wrote: > On Mon, Apr 23, 2012 at 11:13:06AM -0400, Alan Stern wrote: > > The port numbers are determined by the hardware -- each set of wires > > has its own port number. The numbers have nothing to do with > > bandwidth. > Could you figure out the codes in kernel that read out the port number from > hub, if there is a piece of codes do that things? In drivers/usb/core/hub.c, look through the hub_events() routine. There are several function calls similar to this one: ret = hub_port_status(hub, i, &portstatus, &portchange); Here i is the port number. This asks the hub to send back status and change information for port i. (See also the code for the hub_port_status() and get_port_status() routines.) 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
