USB_DEBUG_BRK_SIZE
static const char USB_DEBUG_BRK[USB_DEBUG_BRK_SIZE] = {
ret = usb_serial_generic_write(tty, port, USB_DEBUG_BRK, USB_DEBUG_BRK_SIZE);
if (urb->actual_length == USB_DEBUG_BRK_SIZE &&
USB_DEBUG_BRK_SIZE) == 0) {