snd_mpu401_uart_cmd
if (snd_mpu401_uart_cmd(mpu, MPU401_RESET, 1))
if (snd_mpu401_uart_cmd(mpu, MPU401_ENTER_UART, 0))
err = snd_mpu401_uart_cmd(mpu, MPU401_RESET, 0);
err = snd_mpu401_uart_cmd(mpu, MPU401_RESET, 0);