diff --git a/include/sound/ak4xxx-adda.h b/include/sound/ak4xxx-adda.h
new file mode 100644
index 0000000..e94ac02
--- /dev/null
+++ b/include/sound/ak4xxx-adda.h
@@ -0,0 +1,69 @@
+#ifndef __SOUND_AK4XXX_ADDA_H
+#define __SOUND_AK4XXX_ADDA_H
+
+/*
+ *   ALSA driver for AK4524 / AK4528 / AK4529 / AK4355 / AK4381
+ *   AD and DA converters
+ *
+ *	Copyright (c) 2000 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
+ *
+ */      
+
+#ifndef AK4XXX_MAX_CHIPS
+#define AK4XXX_MAX_CHIPS	4
+#endif
+
+typedef struct snd_akm4xxx akm4xxx_t;
+
+struct snd_ak4xxx_ops {
+	void (*lock)(akm4xxx_t *ak, int chip);
+	void (*unlock)(akm4xxx_t *ak, int chip);
+	void (*write)(akm4xxx_t *ak, int chip, unsigned char reg, unsigned char val);
+	// unsigned char (*read)(akm4xxx_t *ak, int chip, unsigned char reg);
+	void (*set_rate_val)(akm4xxx_t *ak, unsigned int rate);
+};
+
+#define AK4XXX_IMAGE_SIZE	(AK4XXX_MAX_CHIPS * 16)	/* 64 bytes */
+
+struct snd_akm4xxx {
+	snd_card_t *card;
+	unsigned int num_adcs;				/* AK4524 or AK4528 ADCs */
+	unsigned int num_dacs;				/* AK4524 or AK4528 DACs */
+	unsigned char images[AK4XXX_IMAGE_SIZE];	/* saved register image */
+	unsigned char ipga_gain[AK4XXX_MAX_CHIPS][2];	/* saved register image for IPGA (AK4528) */
+	unsigned long private_value[AK4XXX_MAX_CHIPS];	/* helper for driver */
+	void *private_data[AK4XXX_MAX_CHIPS];		/* helper for driver */
+	/* template should fill the following fields */
+	unsigned int idx_offset;			/* control index offset */
+	enum {
+		SND_AK4524, SND_AK4528, SND_AK4529,
+		SND_AK4355, SND_AK4358, SND_AK4381
+	} type;
+	struct snd_ak4xxx_ops ops;
+};
+
+void snd_akm4xxx_write(akm4xxx_t *ak, int chip, unsigned char reg, unsigned char val);
+void snd_akm4xxx_reset(akm4xxx_t *ak, int state);
+void snd_akm4xxx_init(akm4xxx_t *ak);
+int snd_akm4xxx_build_controls(akm4xxx_t *ak);
+
+#define snd_akm4xxx_get(ak,chip,reg) (ak)->images[(chip) * 16 + (reg)]
+#define snd_akm4xxx_set(ak,chip,reg,val) ((ak)->images[(chip) * 16 + (reg)] = (val))
+#define snd_akm4xxx_get_ipga(ak,chip,reg) (ak)->ipga_gain[chip][(reg)-4]
+#define snd_akm4xxx_set_ipga(ak,chip,reg,val) ((ak)->ipga_gain[chip][(reg)-4] = (val))
+
+#endif /* __SOUND_AK4XXX_ADDA_H */