usb.c

			usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_C_ENABLE);

			/* EM interference sometimes causes bad shielded USB devices to
			 * be shutdown by the hub, this hack enables them again.
			 * Works at least with mouse driver */
			if (!(portstatus & USB_PORT_STAT_ENABLE) &&
				(portstatus & USB_PORT_STAT_CONNECTION) && (dev->children[i])) {
				USB_HUB_PRINTF("already running port %i disabled by hub (EMI?), re-enabling...\n",
					i + 1);
					usb_hub_port_connect_change(dev, i);
			}
		}
		if (portstatus & USB_PORT_STAT_SUSPEND) {
			USB_HUB_PRINTF("port %d suspend change\n", i + 1);
			usb_clear_port_feature(dev, i + 1,  USB_PORT_FEAT_SUSPEND);
		}

		if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
			USB_HUB_PRINTF("port %d over-current change\n", i + 1);
			usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_C_OVER_CURRENT);
			usb_hub_power_on(hub);
		}

		if (portchange & USB_PORT_STAT_C_RESET) {
			USB_HUB_PRINTF("port %d reset change\n", i + 1);
			usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_C_RESET);
		}
	} /* end for i all ports */

	return 0;
}

int usb_hub_probe(struct usb_device *dev, int ifnum)
{
	struct usb_interface_descriptor *iface;
	struct usb_endpoint_descriptor *ep;
	int ret;

	iface = &dev->config.if_desc[ifnum];
	/* Is it a hub? */
	if (iface->bInterfaceClass != USB_CLASS_HUB)
		return 0;
	/* Some hubs have a subclass of 1, which AFAICT according to the */
	/*  specs is not defined, but it works */
	if ((iface->bInterfaceSubClass != 0) &&
	    (iface->bInterfaceSubClass != 1))
		return 0;
	/* Multiple endpoints? What kind of mutant ninja-hub is this? */
	if (iface->bNumEndpoints != 1)
		return 0;
	ep = &iface->ep_desc[0];
	/* Output endpoint? Curiousier and curiousier.. */
	if (!(ep->bEndpointAddress & USB_DIR_IN))
		return 0;
	/* If it's not an interrupt endpoint, we'd better punt! */
	if ((ep->bmAttributes & 3) != 3)
		return 0;
	/* We found a hub */
	USB_HUB_PRINTF("USB hub found\n");
	ret=usb_hub_configure(dev);
	return ret;
}

#endif /* (CONFIG_COMMANDS & CFG_CMD_USB) */

/* EOF */