int snd_dg00x_stream_check_external_clock(struct snd_dg00x *dg00x,
bool *detect);
int snd_dg00x_stream_init_duplex(struct snd_dg00x *dg00x);
-int snd_dg00x_stream_start_duplex(struct snd_dg00x *dg00x, unsigned int rate);
+int snd_dg00x_stream_reserve_duplex(struct snd_dg00x *dg00x, unsigned int rate);
+int snd_dg00x_stream_start_duplex(struct snd_dg00x *dg00x);
void snd_dg00x_stream_stop_duplex(struct snd_dg00x *dg00x);
void snd_dg00x_stream_update_duplex(struct snd_dg00x *dg00x);
void snd_dg00x_stream_destroy_duplex(struct snd_dg00x *dg00x);