diff --git a/include/sound/hwdep.h b/include/sound/hwdep.h
new file mode 100644
index 0000000..0438763
--- /dev/null
+++ b/include/sound/hwdep.h
@@ -0,0 +1,73 @@
+#ifndef __SOUND_HWDEP_H
+#define __SOUND_HWDEP_H
+
+/*
+ *  Hardware dependent layer 
+ *  Copyright (c) by Jaroslav Kysela <perex@suse.cz>
+ *
+ *
+ *   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., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ *
+ */
+
+#include <sound/asound.h>
+#include <linux/poll.h>
+
+typedef enum sndrv_hwdep_iface snd_hwdep_iface_t;
+typedef struct sndrv_hwdep_info snd_hwdep_info_t;
+typedef struct sndrv_hwdep_dsp_status snd_hwdep_dsp_status_t;
+typedef struct sndrv_hwdep_dsp_image snd_hwdep_dsp_image_t;
+
+typedef struct _snd_hwdep_ops {
+	long long (*llseek) (snd_hwdep_t *hw, struct file * file, long long offset, int orig);
+	long (*read) (snd_hwdep_t * hw, char __user *buf, long count, loff_t *offset);
+	long (*write) (snd_hwdep_t * hw, const char __user *buf, long count, loff_t *offset);
+	int (*open) (snd_hwdep_t * hw, struct file * file);
+	int (*release) (snd_hwdep_t * hw, struct file * file);
+	unsigned int (*poll) (snd_hwdep_t * hw, struct file * file, poll_table * wait);
+	int (*ioctl) (snd_hwdep_t * hw, struct file * file, unsigned int cmd, unsigned long arg);
+	int (*ioctl_compat) (snd_hwdep_t * hw, struct file * file, unsigned int cmd, unsigned long arg);
+	int (*mmap) (snd_hwdep_t * hw, struct file * file, struct vm_area_struct * vma);
+	int (*dsp_status) (snd_hwdep_t * hw, snd_hwdep_dsp_status_t * status);
+	int (*dsp_load) (snd_hwdep_t * hw, snd_hwdep_dsp_image_t * image);
+} snd_hwdep_ops_t;
+
+struct _snd_hwdep {
+	snd_card_t *card;
+	int device;
+	char id[32];
+	char name[80];
+	int iface;
+
+#ifdef CONFIG_SND_OSSEMUL
+	char oss_dev[32];
+	int oss_type;
+	int ossreg;
+#endif
+
+	snd_hwdep_ops_t ops;
+	wait_queue_head_t open_wait;
+	void *private_data;
+	void (*private_free) (snd_hwdep_t *hwdep);
+
+	struct semaphore open_mutex;
+	int used;
+	unsigned int dsp_loaded;
+	unsigned int exclusive: 1;
+};
+
+extern int snd_hwdep_new(snd_card_t * card, char *id, int device, snd_hwdep_t ** rhwdep);
+
+#endif /* __SOUND_HWDEP_H */