diff --git a/include/sound/hdsp.h b/include/sound/hdsp.h
new file mode 100644
index 0000000..7ce3aa6
--- /dev/null
+++ b/include/sound/hdsp.h
@@ -0,0 +1,110 @@
+#ifndef __SOUND_HDSP_H
+#define __SOUND_HDSP_H
+
+/*
+ *   Copyright (C) 2003 Thomas Charbonnel (thomas@undata.org)
+ *    
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#define HDSP_MATRIX_MIXER_SIZE 2048
+
+typedef enum {
+	Digiface,
+	Multiface,
+	H9652,
+	H9632,
+	Undefined,
+} HDSP_IO_Type;
+
+typedef struct _snd_hdsp_peak_rms hdsp_peak_rms_t;
+
+struct _snd_hdsp_peak_rms {
+	u32 input_peaks[26];
+	u32 playback_peaks[26];
+	u32 output_peaks[28];
+	u64 input_rms[26];
+	u64 playback_rms[26];
+	/* These are only used for H96xx cards */
+	u64 output_rms[26];
+};
+
+#define SNDRV_HDSP_IOCTL_GET_PEAK_RMS _IOR('H', 0x40, hdsp_peak_rms_t)
+
+typedef struct _snd_hdsp_config_info hdsp_config_info_t;
+
+struct _snd_hdsp_config_info {
+	unsigned char pref_sync_ref;
+	unsigned char wordclock_sync_check;
+	unsigned char spdif_sync_check;
+	unsigned char adatsync_sync_check;
+	unsigned char adat_sync_check[3];
+	unsigned char spdif_in;
+	unsigned char spdif_out;
+	unsigned char spdif_professional;
+	unsigned char spdif_emphasis;
+	unsigned char spdif_nonaudio;
+	unsigned int spdif_sample_rate;
+	unsigned int system_sample_rate;
+	unsigned int autosync_sample_rate;
+	unsigned char system_clock_mode;
+	unsigned char clock_source;
+	unsigned char autosync_ref;
+	unsigned char line_out;
+	unsigned char passthru; 
+	unsigned char da_gain;
+	unsigned char ad_gain;
+	unsigned char phone_gain;
+	unsigned char xlr_breakout_cable;
+	unsigned char analog_extension_board;
+};
+
+#define SNDRV_HDSP_IOCTL_GET_CONFIG_INFO _IOR('H', 0x41, hdsp_config_info_t)
+
+typedef struct _snd_hdsp_firmware hdsp_firmware_t;
+
+struct _snd_hdsp_firmware {
+	void __user *firmware_data;	/* 24413 x 4 bytes */
+};
+
+#define SNDRV_HDSP_IOCTL_UPLOAD_FIRMWARE _IOW('H', 0x42, hdsp_firmware_t)
+
+typedef struct _snd_hdsp_version hdsp_version_t;
+
+struct _snd_hdsp_version {
+	HDSP_IO_Type io_type;
+	unsigned short firmware_rev;
+};
+
+#define SNDRV_HDSP_IOCTL_GET_VERSION _IOR('H', 0x43, hdsp_version_t)
+
+typedef struct _snd_hdsp_mixer hdsp_mixer_t;
+
+struct _snd_hdsp_mixer {
+	unsigned short matrix[HDSP_MATRIX_MIXER_SIZE];
+};
+
+#define SNDRV_HDSP_IOCTL_GET_MIXER _IOR('H', 0x44, hdsp_mixer_t)
+
+typedef struct _snd_hdsp_9632_aeb hdsp_9632_aeb_t;
+
+struct _snd_hdsp_9632_aeb {
+	int aebi;
+	int aebo;
+};
+
+#define SNDRV_HDSP_IOCTL_GET_9632_AEB _IOR('H', 0x45, hdsp_9632_aeb_t)
+
+#endif /* __SOUND_HDSP_H */