snd_dg00x_stream_reserve_duplex
err = snd_dg00x_stream_reserve_duplex(dg00x, 0, 0, 0);
err = snd_dg00x_stream_reserve_duplex(dg00x, rate,
int snd_dg00x_stream_reserve_duplex(struct snd_dg00x *dg00x, unsigned int rate,