mixer_ioctl
int (*mixer_ioctl)(u_int, u_long); /* optional */
.mixer_ioctl = TTMixerIoctl,
.mixer_ioctl = FalconMixerIoctl,
return mixer_ioctl(file, cmd, arg);
if (dmasound.mach.mixer_ioctl)
return dmasound.mach.mixer_ioctl(cmd, arg);
ret = mixer_ioctl(file, cmd, arg);
.mixer_ioctl = AmiMixerIoctl,