diff --git a/sound/drivers/opl4/opl4_lib.c b/sound/drivers/opl4/opl4_lib.c
new file mode 100644
index 0000000..8261464
--- /dev/null
+++ b/sound/drivers/opl4/opl4_lib.c
@@ -0,0 +1,281 @@
+/*
+ * Functions for accessing OPL4 devices
+ * Copyright (c) 2003 by Clemens Ladisch <clemens@ladisch.de>
+ *
+ * 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 "opl4_local.h"
+#include <sound/initval.h>
+#include <linux/ioport.h>
+#include <linux/init.h>
+#include <asm/io.h>
+
+MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>");
+MODULE_DESCRIPTION("OPL4 driver");
+MODULE_LICENSE("GPL");
+
+static void inline snd_opl4_wait(opl4_t *opl4)
+{
+	int timeout = 10;
+	while ((inb(opl4->fm_port) & OPL4_STATUS_BUSY) && --timeout > 0)
+		;
+}
+
+void snd_opl4_write(opl4_t *opl4, u8 reg, u8 value)
+{
+	snd_opl4_wait(opl4);
+	outb(reg, opl4->pcm_port);
+
+	snd_opl4_wait(opl4);
+	outb(value, opl4->pcm_port + 1);
+}
+
+u8 snd_opl4_read(opl4_t *opl4, u8 reg)
+{
+	snd_opl4_wait(opl4);
+	outb(reg, opl4->pcm_port);
+
+	snd_opl4_wait(opl4);
+	return inb(opl4->pcm_port + 1);
+}
+
+void snd_opl4_read_memory(opl4_t *opl4, char *buf, int offset, int size)
+{
+	unsigned long flags;
+	u8 memcfg;
+
+	spin_lock_irqsave(&opl4->reg_lock, flags);
+
+	memcfg = snd_opl4_read(opl4, OPL4_REG_MEMORY_CONFIGURATION);
+	snd_opl4_write(opl4, OPL4_REG_MEMORY_CONFIGURATION, memcfg | OPL4_MODE_BIT);
+
+	snd_opl4_write(opl4, OPL4_REG_MEMORY_ADDRESS_HIGH, offset >> 16);
+	snd_opl4_write(opl4, OPL4_REG_MEMORY_ADDRESS_MID, offset >> 8);
+	snd_opl4_write(opl4, OPL4_REG_MEMORY_ADDRESS_LOW, offset);
+
+	snd_opl4_wait(opl4);
+	outb(OPL4_REG_MEMORY_DATA, opl4->pcm_port);
+	snd_opl4_wait(opl4);
+	insb(opl4->pcm_port + 1, buf, size);
+
+	snd_opl4_write(opl4, OPL4_REG_MEMORY_CONFIGURATION, memcfg);
+
+	spin_unlock_irqrestore(&opl4->reg_lock, flags);
+}
+
+void snd_opl4_write_memory(opl4_t *opl4, const char *buf, int offset, int size)
+{
+	unsigned long flags;
+	u8 memcfg;
+
+	spin_lock_irqsave(&opl4->reg_lock, flags);
+
+	memcfg = snd_opl4_read(opl4, OPL4_REG_MEMORY_CONFIGURATION);
+	snd_opl4_write(opl4, OPL4_REG_MEMORY_CONFIGURATION, memcfg | OPL4_MODE_BIT);
+
+	snd_opl4_write(opl4, OPL4_REG_MEMORY_ADDRESS_HIGH, offset >> 16);
+	snd_opl4_write(opl4, OPL4_REG_MEMORY_ADDRESS_MID, offset >> 8);
+	snd_opl4_write(opl4, OPL4_REG_MEMORY_ADDRESS_LOW, offset);
+
+	snd_opl4_wait(opl4);
+	outb(OPL4_REG_MEMORY_DATA, opl4->pcm_port);
+	snd_opl4_wait(opl4);
+	outsb(opl4->pcm_port + 1, buf, size);
+
+	snd_opl4_write(opl4, OPL4_REG_MEMORY_CONFIGURATION, memcfg);
+
+	spin_unlock_irqrestore(&opl4->reg_lock, flags);
+}
+
+static void snd_opl4_enable_opl4(opl4_t *opl4)
+{
+	outb(OPL3_REG_MODE, opl4->fm_port + 2);
+	inb(opl4->fm_port);
+	inb(opl4->fm_port);
+	outb(OPL3_OPL3_ENABLE | OPL3_OPL4_ENABLE, opl4->fm_port + 3);
+	inb(opl4->fm_port);
+	inb(opl4->fm_port);
+}
+
+static int snd_opl4_detect(opl4_t *opl4)
+{
+	u8 id1, id2;
+
+	snd_opl4_enable_opl4(opl4);
+
+	id1 = snd_opl4_read(opl4, OPL4_REG_MEMORY_CONFIGURATION);
+	snd_printdd("OPL4[02]=%02x\n", id1);
+	switch (id1 & OPL4_DEVICE_ID_MASK) {
+	case 0x20:
+		opl4->hardware = OPL3_HW_OPL4;
+		break;
+	case 0x40:
+		opl4->hardware = OPL3_HW_OPL4_ML;
+		break;
+	default:
+		return -ENODEV;
+	}
+
+	snd_opl4_write(opl4, OPL4_REG_MIX_CONTROL_FM, 0x00);
+	snd_opl4_write(opl4, OPL4_REG_MIX_CONTROL_PCM, 0xff);
+	id1 = snd_opl4_read(opl4, OPL4_REG_MIX_CONTROL_FM);
+	id2 = snd_opl4_read(opl4, OPL4_REG_MIX_CONTROL_PCM);
+	snd_printdd("OPL4 id1=%02x id2=%02x\n", id1, id2);
+       	if (id1 != 0x00 || id2 != 0xff)
+		return -ENODEV;
+
+	snd_opl4_write(opl4, OPL4_REG_MIX_CONTROL_FM, 0x3f);
+	snd_opl4_write(opl4, OPL4_REG_MIX_CONTROL_PCM, 0x3f);
+	snd_opl4_write(opl4, OPL4_REG_MEMORY_CONFIGURATION, 0x00);
+	return 0;
+}
+
+#if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
+static void snd_opl4_seq_dev_free(snd_seq_device_t *seq_dev)
+{
+	opl4_t *opl4 = seq_dev->private_data;
+	opl4->seq_dev = NULL;
+}
+
+static int snd_opl4_create_seq_dev(opl4_t *opl4, int seq_device)
+{
+	opl4->seq_dev_num = seq_device;
+	if (snd_seq_device_new(opl4->card, seq_device, SNDRV_SEQ_DEV_ID_OPL4,
+			       sizeof(opl4_t *), &opl4->seq_dev) >= 0) {
+		strcpy(opl4->seq_dev->name, "OPL4 Wavetable");
+		*(opl4_t **)SNDRV_SEQ_DEVICE_ARGPTR(opl4->seq_dev) = opl4;
+		opl4->seq_dev->private_data = opl4;
+		opl4->seq_dev->private_free = snd_opl4_seq_dev_free;
+	}
+	return 0;
+}
+#endif
+
+static void snd_opl4_free(opl4_t *opl4)
+{
+#ifdef CONFIG_PROC_FS
+	snd_opl4_free_proc(opl4);
+#endif
+	if (opl4->res_fm_port) {
+		release_resource(opl4->res_fm_port);
+		kfree_nocheck(opl4->res_fm_port);
+	}
+	if (opl4->res_pcm_port) {
+		release_resource(opl4->res_pcm_port);
+		kfree_nocheck(opl4->res_pcm_port);
+	}
+	kfree(opl4);
+}
+
+static int snd_opl4_dev_free(snd_device_t *device)
+{
+	opl4_t *opl4 = device->device_data;
+	snd_opl4_free(opl4);
+	return 0;
+}
+
+int snd_opl4_create(snd_card_t *card,
+		    unsigned long fm_port, unsigned long pcm_port,
+		    int seq_device,
+		    opl3_t **ropl3, opl4_t **ropl4)
+{
+	opl4_t *opl4;
+	opl3_t *opl3;
+	int err;
+	static snd_device_ops_t ops = {
+		.dev_free = snd_opl4_dev_free
+	};
+
+	if (ropl3)
+		*ropl3 = NULL;
+	if (ropl4)
+		*ropl4 = NULL;
+
+	opl4 = kcalloc(1, sizeof(*opl4), GFP_KERNEL);
+	if (!opl4)
+		return -ENOMEM;
+
+	opl4->res_fm_port = request_region(fm_port, 8, "OPL4 FM");
+	opl4->res_pcm_port = request_region(pcm_port, 8, "OPL4 PCM/MIX");
+	if (!opl4->res_fm_port || !opl4->res_pcm_port) {
+		snd_printk(KERN_ERR "opl4: can't grab ports 0x%lx, 0x%lx\n", fm_port, pcm_port);
+		snd_opl4_free(opl4);
+		return -EBUSY;
+	}
+
+	opl4->card = card;
+	opl4->fm_port = fm_port;
+	opl4->pcm_port = pcm_port;
+	spin_lock_init(&opl4->reg_lock);
+	init_MUTEX(&opl4->access_mutex);
+
+	err = snd_opl4_detect(opl4);
+	if (err < 0) {
+		snd_opl4_free(opl4);
+		snd_printd("OPL4 chip not detected at %#lx/%#lx\n", fm_port, pcm_port);
+		return err;
+	}
+
+	err = snd_device_new(card, SNDRV_DEV_CODEC, opl4, &ops);
+	if (err < 0) {
+		snd_opl4_free(opl4);
+		return err;
+	}
+
+	err = snd_opl3_create(card, fm_port, fm_port + 2, opl4->hardware, 1, &opl3);
+	if (err < 0) {
+		snd_device_free(card, opl4);
+		return err;
+	}
+
+	/* opl3 initialization disabled opl4, so reenable */
+	snd_opl4_enable_opl4(opl4);
+
+	snd_opl4_create_mixer(opl4);
+#ifdef CONFIG_PROC_FS
+	snd_opl4_create_proc(opl4);
+#endif
+
+#if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
+	opl4->seq_client = -1;
+	if (opl4->hardware < OPL3_HW_OPL4_ML)
+		snd_opl4_create_seq_dev(opl4, seq_device);
+#endif
+
+	if (ropl3)
+		*ropl3 = opl3;
+	if (ropl4)
+		*ropl4 = opl4;
+	return 0;
+}
+
+EXPORT_SYMBOL(snd_opl4_write);
+EXPORT_SYMBOL(snd_opl4_read);
+EXPORT_SYMBOL(snd_opl4_write_memory);
+EXPORT_SYMBOL(snd_opl4_read_memory);
+EXPORT_SYMBOL(snd_opl4_create);
+
+static int __init alsa_opl4_init(void)
+{
+	return 0;
+}
+
+static void __exit alsa_opl4_exit(void)
+{
+}
+
+module_init(alsa_opl4_init)
+module_exit(alsa_opl4_exit)