- struct usb_device * usb_alloc_dev(struct usb_device * parent, struct usb_bus * bus, unsigned port1);
- hub to which device is connected; null to allocate a root hub
- bus used to access the device
- one-based index of port; ignored for root hubs
Only hub drivers (including virtual root hub drivers for host controllers) should ever call this.
This call may not be used in a non-sleeping context.
On success, a pointer to the allocated usb device. NULL on failure.