snd_uart16550_output_byte
snd_uart16550_output_byte(uart, substream, addr_byte);
snd_uart16550_output_byte(uart, substream, midi_byte);
snd_uart16550_output_byte(uart, substream,
snd_uart16550_output_byte(uart, substream,
snd_uart16550_output_byte(uart, substream, uart->prev_status[uart->prev_out]);
if (!snd_uart16550_output_byte(uart, substream, midi_byte) &&