-static int snd_opl3_play_note(opl3_t * opl3, snd_dm_fm_note_t * note);
-static int snd_opl3_set_voice(opl3_t * opl3, snd_dm_fm_voice_t * voice);
-static int snd_opl3_set_params(opl3_t * opl3, snd_dm_fm_params_t * params);
-static int snd_opl3_set_mode(opl3_t * opl3, int mode);
-static int snd_opl3_set_connection(opl3_t * opl3, int connection);
+static int snd_opl3_play_note(struct snd_opl3 * opl3, struct snd_dm_fm_note * note);
+static int snd_opl3_set_voice(struct snd_opl3 * opl3, struct snd_dm_fm_voice * voice);
+static int snd_opl3_set_params(struct snd_opl3 * opl3, struct snd_dm_fm_params * params);
+static int snd_opl3_set_mode(struct snd_opl3 * opl3, int mode);
+static int snd_opl3_set_connection(struct snd_opl3 * opl3, int connection);