digi_write_oob_command
ret = digi_write_oob_command(port, buf, 8, 1);
ret = digi_write_oob_command(port, buf, 20, 0);
static int digi_write_oob_command(struct usb_serial_port *port,
ret = digi_write_oob_command(port, buf, i, 1);