int res = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
VENDOR_WRITE_REQUEST, VENDOR_WRITE_REQUEST_TYPE,
value, index, NULL, 0, 100);
int res = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
VENDOR_WRITE_REQUEST, VENDOR_WRITE_REQUEST_TYPE,
value, index, NULL, 0, 100);