snd_dm_fm_note
#define SNDRV_DM_FM_IOCTL_PLAY_NOTE _IOW('H', 0x22, struct snd_dm_fm_note)
struct snd_dm_fm_note note;
if (copy_from_user(¬e, argp, sizeof(struct snd_dm_fm_note)))
static int snd_opl3_play_note(struct snd_opl3 * opl3, struct snd_dm_fm_note * note)
static int snd_opl3_play_note(struct snd_opl3 * opl3, struct snd_dm_fm_note * note);