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diff --git a/include/sound/opl3.h b/include/sound/opl3.h
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+++ b/include/sound/opl3.h
@@ -0,0 +1,393 @@
+#ifndef __SOUND_OPL3_H
+#define __SOUND_OPL3_H
+
+/*
+ * Definitions of the OPL-3 registers.
+ *
+ * Copyright (c) by Jaroslav Kysela <perex@perex.cz>,
+ *                  Hannu Savolainen 1993-1996
+ *
+ *
+ *      The OPL-3 mode is switched on by writing 0x01, to the offset 5
+ *      of the right side.
+ *
+ *      Another special register at the right side is at offset 4. It contains
+ *      a bit mask defining which voices are used as 4 OP voices.
+ *
+ *      The percussive mode is implemented in the left side only.
+ *
+ *      With the above exceptions the both sides can be operated independently.
+ *      
+ *      A 4 OP voice can be created by setting the corresponding
+ *      bit at offset 4 of the right side.
+ *
+ *      For example setting the rightmost bit (0x01) changes the
+ *      first voice on the right side to the 4 OP mode. The fourth
+ *      voice is made inaccessible.
+ *
+ *      If a voice is set to the 2 OP mode, it works like 2 OP modes
+ *      of the original YM3812 (AdLib). In addition the voice can 
+ *      be connected the left, right or both stereo channels. It can
+ *      even be left unconnected. This works with 4 OP voices also.
+ *
+ *      The stereo connection bits are located in the FEEDBACK_CONNECTION
+ *      register of the voice (0xC0-0xC8). In 4 OP voices these bits are
+ *      in the second half of the voice.
+ *
+ *
+ *   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/core.h>
+#include <sound/hwdep.h>
+#include <sound/timer.h>
+#include <sound/seq_midi_emul.h>
+#ifdef CONFIG_SND_SEQUENCER_OSS
+#include <sound/seq_oss.h>
+#include <sound/seq_oss_legacy.h>
+#endif
+#include <sound/seq_device.h>
+#include <sound/asound_fm.h>
+
+/*
+ *    Register numbers for the global registers
+ */
+
+#define OPL3_REG_TEST			0x01
+#define   OPL3_ENABLE_WAVE_SELECT	0x20
+
+#define OPL3_REG_TIMER1			0x02
+#define OPL3_REG_TIMER2			0x03
+#define OPL3_REG_TIMER_CONTROL		0x04	/* Left side */
+#define   OPL3_IRQ_RESET		0x80
+#define   OPL3_TIMER1_MASK		0x40
+#define   OPL3_TIMER2_MASK		0x20
+#define   OPL3_TIMER1_START		0x01
+#define   OPL3_TIMER2_START		0x02
+
+#define OPL3_REG_CONNECTION_SELECT	0x04	/* Right side */
+#define   OPL3_LEFT_4OP_0		0x01
+#define   OPL3_LEFT_4OP_1		0x02
+#define   OPL3_LEFT_4OP_2		0x04
+#define   OPL3_RIGHT_4OP_0		0x08
+#define   OPL3_RIGHT_4OP_1		0x10
+#define   OPL3_RIGHT_4OP_2		0x20
+
+#define OPL3_REG_MODE			0x05	/* Right side */
+#define   OPL3_OPL3_ENABLE		0x01	/* OPL3 mode */
+#define   OPL3_OPL4_ENABLE		0x02	/* OPL4 mode */
+
+#define OPL3_REG_KBD_SPLIT		0x08	/* Left side */
+#define   OPL3_COMPOSITE_SINE_WAVE_MODE	0x80	/* Don't use with OPL-3? */
+#define   OPL3_KEYBOARD_SPLIT		0x40
+
+#define OPL3_REG_PERCUSSION		0xbd	/* Left side only */
+#define   OPL3_TREMOLO_DEPTH		0x80
+#define   OPL3_VIBRATO_DEPTH		0x40
+#define	  OPL3_PERCUSSION_ENABLE	0x20
+#define   OPL3_BASSDRUM_ON		0x10
+#define   OPL3_SNAREDRUM_ON		0x08
+#define   OPL3_TOMTOM_ON		0x04
+#define   OPL3_CYMBAL_ON		0x02
+#define   OPL3_HIHAT_ON			0x01
+
+/*
+ *    Offsets to the register banks for operators. To get the
+ *      register number just add the operator offset to the bank offset
+ *
+ *      AM/VIB/EG/KSR/Multiple (0x20 to 0x35)
+ */
+#define OPL3_REG_AM_VIB			0x20
+#define   OPL3_TREMOLO_ON		0x80
+#define   OPL3_VIBRATO_ON		0x40
+#define   OPL3_SUSTAIN_ON		0x20
+#define   OPL3_KSR			0x10	/* Key scaling rate */
+#define   OPL3_MULTIPLE_MASK		0x0f	/* Frequency multiplier */
+
+ /*
+  *   KSL/Total level (0x40 to 0x55)
+  */
+#define OPL3_REG_KSL_LEVEL		0x40
+#define   OPL3_KSL_MASK			0xc0	/* Envelope scaling bits */
+#define   OPL3_TOTAL_LEVEL_MASK		0x3f	/* Strength (volume) of OP */
+
+/*
+ *    Attack / Decay rate (0x60 to 0x75)
+ */
+#define OPL3_REG_ATTACK_DECAY		0x60
+#define   OPL3_ATTACK_MASK		0xf0
+#define   OPL3_DECAY_MASK		0x0f
+
+/*
+ * Sustain level / Release rate (0x80 to 0x95)
+ */
+#define OPL3_REG_SUSTAIN_RELEASE	0x80
+#define   OPL3_SUSTAIN_MASK		0xf0
+#define   OPL3_RELEASE_MASK		0x0f
+
+/*
+ * Wave select (0xE0 to 0xF5)
+ */
+#define OPL3_REG_WAVE_SELECT		0xe0
+#define   OPL3_WAVE_SELECT_MASK		0x07
+
+/*
+ *    Offsets to the register banks for voices. Just add to the
+ *      voice number to get the register number.
+ *
+ *      F-Number low bits (0xA0 to 0xA8).
+ */
+#define OPL3_REG_FNUM_LOW		0xa0
+
+/*
+ *    F-number high bits / Key on / Block (octave) (0xB0 to 0xB8)
+ */
+#define OPL3_REG_KEYON_BLOCK		0xb0
+#define	  OPL3_KEYON_BIT		0x20
+#define	  OPL3_BLOCKNUM_MASK		0x1c
+#define   OPL3_FNUM_HIGH_MASK		0x03
+
+/*
+ *    Feedback / Connection (0xc0 to 0xc8)
+ *
+ *      These registers have two new bits when the OPL-3 mode
+ *      is selected. These bits controls connecting the voice
+ *      to the stereo channels. For 4 OP voices this bit is
+ *      defined in the second half of the voice (add 3 to the
+ *      register offset).
+ *
+ *      For 4 OP voices the connection bit is used in the
+ *      both halves (gives 4 ways to connect the operators).
+ */
+#define OPL3_REG_FEEDBACK_CONNECTION	0xc0
+#define   OPL3_FEEDBACK_MASK		0x0e	/* Valid just for 1st OP of a voice */
+#define   OPL3_CONNECTION_BIT		0x01
+/*
+ *    In the 4 OP mode there is four possible configurations how the
+ *      operators can be connected together (in 2 OP modes there is just
+ *      AM or FM). The 4 OP connection mode is defined by the rightmost
+ *      bit of the FEEDBACK_CONNECTION (0xC0-0xC8) on the both halves.
+ *
+ *      First half      Second half     Mode
+ *
+ *                                       +---+
+ *                                       v   |
+ *      0               0               >+-1-+--2--3--4-->
+ *
+ *
+ *                                      
+ *                                       +---+
+ *                                       |   |
+ *      0               1               >+-1-+--2-+
+ *                                                |->
+ *                                      >--3----4-+
+ *                                      
+ *                                       +---+
+ *                                       |   |
+ *      1               0               >+-1-+-----+
+ *                                                 |->
+ *                                      >--2--3--4-+
+ *
+ *                                       +---+
+ *                                       |   |
+ *      1               1               >+-1-+--+
+ *                                              |
+ *                                      >--2--3-+->
+ *                                              |
+ *                                      >--4----+
+ */
+#define   OPL3_STEREO_BITS		0x30	/* OPL-3 only */
+#define     OPL3_VOICE_TO_LEFT		0x10
+#define     OPL3_VOICE_TO_RIGHT		0x20
+
+/*
+
+ */
+
+#define OPL3_LEFT		0x0000
+#define OPL3_RIGHT		0x0100
+
+#define OPL3_HW_AUTO		0x0000
+#define OPL3_HW_OPL2		0x0200
+#define OPL3_HW_OPL3		0x0300
+#define OPL3_HW_OPL3_SV		0x0301	/* S3 SonicVibes */
+#define OPL3_HW_OPL3_CS		0x0302	/* CS4232/CS4236+ */
+#define OPL3_HW_OPL3_FM801	0x0303	/* FM801 */
+#define OPL3_HW_OPL3_CS4281	0x0304	/* CS4281 */
+#define OPL3_HW_OPL4		0x0400	/* YMF278B/YMF295 */
+#define OPL3_HW_OPL4_ML		0x0401	/* YMF704/YMF721 */
+#define OPL3_HW_MASK		0xff00
+
+#define MAX_OPL2_VOICES		9
+#define MAX_OPL3_VOICES		18
+
+struct snd_opl3;
+
+/*
+ * Instrument record, aka "Patch"
+ */
+
+/* FM operator */
+struct fm_operator {
+	unsigned char am_vib;
+	unsigned char ksl_level;
+	unsigned char attack_decay;
+	unsigned char sustain_release;
+	unsigned char wave_select;
+} __attribute__((packed));
+
+/* Instrument data */
+struct fm_instrument {
+	struct fm_operator op[4];
+	unsigned char feedback_connection[2];
+	unsigned char echo_delay;
+	unsigned char echo_atten;
+	unsigned char chorus_spread;
+	unsigned char trnsps;
+	unsigned char fix_dur;
+	unsigned char modes;
+	unsigned char fix_key;
+};
+
+/* type */
+#define FM_PATCH_OPL2	0x01		/* OPL2 2 operators FM instrument */
+#define FM_PATCH_OPL3	0x02		/* OPL3 4 operators FM instrument */
+
+/* Instrument record */
+struct fm_patch {
+	unsigned char prog;
+	unsigned char bank;
+	unsigned char type;
+	struct fm_instrument inst;
+	char name[24];
+	struct fm_patch *next;
+};
+
+
+/*
+ * A structure to keep track of each hardware voice
+ */
+struct snd_opl3_voice {
+	int  state;		/* status */
+#define SNDRV_OPL3_ST_OFF		0	/* Not playing */
+#define SNDRV_OPL3_ST_ON_2OP	1	/* 2op voice is allocated */
+#define SNDRV_OPL3_ST_ON_4OP	2	/* 4op voice is allocated */
+#define SNDRV_OPL3_ST_NOT_AVAIL	-1	/* voice is not available */
+
+	unsigned int time;	/* An allocation time */
+	unsigned char note;	/* Note currently assigned to this voice */
+
+	unsigned long note_off;	/* note-off time */
+	int note_off_check;	/* check note-off time */
+
+	unsigned char keyon_reg;	/* KON register shadow */
+
+	struct snd_midi_channel *chan;	/* Midi channel for this note */
+};
+
+struct snd_opl3 {
+	unsigned long l_port;
+	unsigned long r_port;
+	struct resource *res_l_port;
+	struct resource *res_r_port;
+	unsigned short hardware;
+	/* hardware access */
+	void (*command) (struct snd_opl3 * opl3, unsigned short cmd, unsigned char val);
+	unsigned short timer_enable;
+	int seq_dev_num;	/* sequencer device number */
+	struct snd_timer *timer1;
+	struct snd_timer *timer2;
+	spinlock_t timer_lock;
+
+	void *private_data;
+	void (*private_free)(struct snd_opl3 *);
+
+	struct snd_hwdep *hwdep;
+	spinlock_t reg_lock;
+	struct snd_card *card;		/* The card that this belongs to */
+	unsigned char fm_mode;		/* OPL mode, see SNDRV_DM_FM_MODE_XXX */
+	unsigned char rhythm;		/* percussion mode flag */
+	unsigned char max_voices;	/* max number of voices */
+#if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE)
+#define SNDRV_OPL3_MODE_SYNTH 0		/* OSS - voices allocated by application */
+#define SNDRV_OPL3_MODE_SEQ 1		/* ALSA - driver handles voice allocation */
+	int synth_mode;			/* synth mode */
+	int seq_client;
+
+	struct snd_seq_device *seq_dev;	/* sequencer device */
+	struct snd_midi_channel_set * chset;
+
+#ifdef CONFIG_SND_SEQUENCER_OSS
+	struct snd_seq_device *oss_seq_dev;	/* OSS sequencer device */
+	struct snd_midi_channel_set * oss_chset;
+#endif
+ 
+#define OPL3_PATCH_HASH_SIZE	32
+	struct fm_patch *patch_table[OPL3_PATCH_HASH_SIZE];
+
+	struct snd_opl3_voice voices[MAX_OPL3_VOICES]; /* Voices (OPL3 'channel') */
+	int use_time;			/* allocation counter */
+
+	unsigned short connection_reg;	/* connection reg shadow */
+	unsigned char drum_reg;		/* percussion reg shadow */
+
+	spinlock_t voice_lock;		/* Lock for voice access */
+
+	struct timer_list tlist;	/* timer for note-offs and effects */
+	int sys_timer_status;		/* system timer run status */
+	spinlock_t sys_timer_lock;	/* Lock for system timer access */
+#endif
+};
+
+/* opl3.c */
+void snd_opl3_interrupt(struct snd_hwdep * hw);
+int snd_opl3_new(struct snd_card *card, unsigned short hardware,
+		 struct snd_opl3 **ropl3);
+int snd_opl3_init(struct snd_opl3 *opl3);
+int snd_opl3_create(struct snd_card *card,
+		    unsigned long l_port, unsigned long r_port,
+		    unsigned short hardware,
+		    int integrated,
+		    struct snd_opl3 ** opl3);
+int snd_opl3_timer_new(struct snd_opl3 * opl3, int timer1_dev, int timer2_dev);
+int snd_opl3_hwdep_new(struct snd_opl3 * opl3, int device, int seq_device,
+		       struct snd_hwdep ** rhwdep);
+
+/* opl3_synth */
+int snd_opl3_open(struct snd_hwdep * hw, struct file *file);
+int snd_opl3_ioctl(struct snd_hwdep * hw, struct file *file,
+		   unsigned int cmd, unsigned long arg);
+int snd_opl3_release(struct snd_hwdep * hw, struct file *file);
+
+void snd_opl3_reset(struct snd_opl3 * opl3);
+
+#if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE)
+long snd_opl3_write(struct snd_hwdep *hw, const char __user *buf, long count,
+		    loff_t *offset);
+int snd_opl3_load_patch(struct snd_opl3 *opl3,
+			int prog, int bank, int type,
+			const char *name,
+			const unsigned char *ext,
+			const unsigned char *data);
+struct fm_patch *snd_opl3_find_patch(struct snd_opl3 *opl3, int prog, int bank,
+				     int create_patch);
+void snd_opl3_clear_patches(struct snd_opl3 *opl3);
+#else
+#define snd_opl3_write	NULL
+static inline void snd_opl3_clear_patches(struct snd_opl3 *opl3) {}
+#endif
+
+#endif /* __SOUND_OPL3_H */