snd_usb_mixer_notify_id
snd_usb_mixer_notify_id(mixer, status->bOriginator);
void snd_usb_mixer_notify_id(struct usb_mixer_interface *mixer, int unitid);
snd_usb_mixer_notify_id(mixer, unitid);
snd_usb_mixer_notify_id(mixer, rc->mute_mixer_id);
snd_usb_mixer_notify_id(mixer, mixer->rc_cfg->mute_mixer_id);