hdspm_mixer_ioctl  222 include/uapi/sound/hdspm.h #define SNDRV_HDSPM_IOCTL_GET_MIXER _IOR('H', 0x44, struct hdspm_mixer_ioctl)
hdspm_mixer_ioctl 6165 sound/pci/rme9652/hdspm.c 	struct hdspm_mixer_ioctl mixer;