snd_oxfw_stream_reserve_duplex
err = snd_oxfw_stream_reserve_duplex(oxfw, &oxfw->tx_stream, 0, 0, 0, 0);
err = snd_oxfw_stream_reserve_duplex(oxfw, &oxfw->rx_stream, 0, 0, 0, 0);
err = snd_oxfw_stream_reserve_duplex(oxfw, &oxfw->tx_stream,
err = snd_oxfw_stream_reserve_duplex(oxfw, &oxfw->rx_stream,
int snd_oxfw_stream_reserve_duplex(struct snd_oxfw *oxfw,