usb_find_device — find a specific usb device in the system
struct usb_device * usb_find_device (u16 vendor_id, u16 product_id);
vendor_idthe vendor id of the device to find
product_idthe product id of the device to find
Returns a pointer to a struct usb_device if such a specified usb
device is present in the system currently. The usage count of the
device will be incremented if a device is found. Make sure to call
usb_put_dev when the caller is finished with the device.
If a device with the specified vendor and product id is not found, NULL is returned.