+#define SNDRV_HDSPM_IOCTL_GET_MIXER _IOR('H', 0x44, struct hdspm_mixer_ioctl)
+
+/* typedefs for compatibility to user-space */
+typedef struct hdspm_peak_rms hdspm_peak_rms_t;
+typedef struct hdspm_config_info hdspm_config_info_t;
+typedef struct hdspm_version hdspm_version_t;
+typedef struct hdspm_channelfader snd_hdspm_channelfader_t;
+typedef struct hdspm_mixer hdspm_mixer_t;