diff --git a/sound/core/hwdep.c b/sound/core/hwdep.c
new file mode 100644
index 0000000..997dd41
--- /dev/null
+++ b/sound/core/hwdep.c
@@ -0,0 +1,524 @@
+/*
+ *  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/driver.h>
+#include <linux/major.h>
+#include <linux/init.h>
+#include <linux/smp_lock.h>
+#include <linux/slab.h>
+#include <linux/time.h>
+#include <sound/core.h>
+#include <sound/control.h>
+#include <sound/minors.h>
+#include <sound/hwdep.h>
+#include <sound/info.h>
+
+MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>");
+MODULE_DESCRIPTION("Hardware dependent layer");
+MODULE_LICENSE("GPL");
+
+static snd_hwdep_t *snd_hwdep_devices[SNDRV_CARDS * SNDRV_MINOR_HWDEPS];
+
+static DECLARE_MUTEX(register_mutex);
+
+static int snd_hwdep_free(snd_hwdep_t *hwdep);
+static int snd_hwdep_dev_free(snd_device_t *device);
+static int snd_hwdep_dev_register(snd_device_t *device);
+static int snd_hwdep_dev_unregister(snd_device_t *device);
+
+/*
+
+ */
+
+static loff_t snd_hwdep_llseek(struct file * file, loff_t offset, int orig)
+{
+	snd_hwdep_t *hw = file->private_data;
+	if (hw->ops.llseek)
+		return hw->ops.llseek(hw, file, offset, orig);
+	return -ENXIO;
+}
+
+static ssize_t snd_hwdep_read(struct file * file, char __user *buf, size_t count, loff_t *offset)
+{
+	snd_hwdep_t *hw = file->private_data;
+	if (hw->ops.read)
+		return hw->ops.read(hw, buf, count, offset);
+	return -ENXIO;	
+}
+
+static ssize_t snd_hwdep_write(struct file * file, const char __user *buf, size_t count, loff_t *offset)
+{
+	snd_hwdep_t *hw = file->private_data;
+	if (hw->ops.write)
+		return hw->ops.write(hw, buf, count, offset);
+	return -ENXIO;	
+}
+
+static int snd_hwdep_open(struct inode *inode, struct file * file)
+{
+	int major = imajor(inode);
+	int cardnum;
+	int device;
+	snd_hwdep_t *hw;
+	int err;
+	wait_queue_t wait;
+
+	switch (major) {
+	case CONFIG_SND_MAJOR:
+		cardnum = SNDRV_MINOR_CARD(iminor(inode));
+		device = SNDRV_MINOR_DEVICE(iminor(inode)) - SNDRV_MINOR_HWDEP;
+		break;
+#ifdef CONFIG_SND_OSSEMUL
+	case SOUND_MAJOR:
+		cardnum = SNDRV_MINOR_OSS_CARD(iminor(inode));
+		device = 0;
+		break;
+#endif
+	default:
+		return -ENXIO;
+	}
+	cardnum %= SNDRV_CARDS;
+	device %= SNDRV_MINOR_HWDEPS;
+	hw = snd_hwdep_devices[(cardnum * SNDRV_MINOR_HWDEPS) + device];
+	if (hw == NULL)
+		return -ENODEV;
+
+	if (!hw->ops.open)
+		return -ENXIO;
+#ifdef CONFIG_SND_OSSEMUL
+	if (major == SOUND_MAJOR && hw->oss_type < 0)
+		return -ENXIO;
+#endif
+
+	if (!try_module_get(hw->card->module))
+		return -EFAULT;
+
+	init_waitqueue_entry(&wait, current);
+	add_wait_queue(&hw->open_wait, &wait);
+	down(&hw->open_mutex);
+	while (1) {
+		if (hw->exclusive && hw->used > 0) {
+			err = -EBUSY;
+			break;
+		}
+		err = hw->ops.open(hw, file);
+		if (err >= 0)
+			break;
+		if (err == -EAGAIN) {
+			if (file->f_flags & O_NONBLOCK) {
+				err = -EBUSY;
+				break;
+			}
+		} else
+			break;
+		set_current_state(TASK_INTERRUPTIBLE);
+		up(&hw->open_mutex);
+		schedule();
+		down(&hw->open_mutex);
+		if (signal_pending(current)) {
+			err = -ERESTARTSYS;
+			break;
+		}
+	}
+	remove_wait_queue(&hw->open_wait, &wait);
+	if (err >= 0) {
+		err = snd_card_file_add(hw->card, file);
+		if (err >= 0) {
+			file->private_data = hw;
+			hw->used++;
+		} else {
+			if (hw->ops.release)
+				hw->ops.release(hw, file);
+		}
+	}
+	up(&hw->open_mutex);
+	if (err < 0)
+		module_put(hw->card->module);
+	return err;
+}
+
+static int snd_hwdep_release(struct inode *inode, struct file * file)
+{
+	int err = -ENXIO;
+	snd_hwdep_t *hw = file->private_data;
+	down(&hw->open_mutex);
+	if (hw->ops.release) {
+		err = hw->ops.release(hw, file);
+		wake_up(&hw->open_wait);
+	}
+	if (hw->used > 0)
+		hw->used--;
+	snd_card_file_remove(hw->card, file);
+	up(&hw->open_mutex);
+	module_put(hw->card->module);
+	return err;
+}
+
+static unsigned int snd_hwdep_poll(struct file * file, poll_table * wait)
+{
+	snd_hwdep_t *hw = file->private_data;
+	if (hw->ops.poll)
+		return hw->ops.poll(hw, file, wait);
+	return 0;
+}
+
+static int snd_hwdep_info(snd_hwdep_t *hw, snd_hwdep_info_t __user *_info)
+{
+	snd_hwdep_info_t info;
+	
+	memset(&info, 0, sizeof(info));
+	info.card = hw->card->number;
+	strlcpy(info.id, hw->id, sizeof(info.id));	
+	strlcpy(info.name, hw->name, sizeof(info.name));
+	info.iface = hw->iface;
+	if (copy_to_user(_info, &info, sizeof(info)))
+		return -EFAULT;
+	return 0;
+}
+
+static int snd_hwdep_dsp_status(snd_hwdep_t *hw, snd_hwdep_dsp_status_t __user *_info)
+{
+	snd_hwdep_dsp_status_t info;
+	int err;
+	
+	if (! hw->ops.dsp_status)
+		return -ENXIO;
+	memset(&info, 0, sizeof(info));
+	info.dsp_loaded = hw->dsp_loaded;
+	if ((err = hw->ops.dsp_status(hw, &info)) < 0)
+		return err;
+	if (copy_to_user(_info, &info, sizeof(info)))
+		return -EFAULT;
+	return 0;
+}
+
+static int snd_hwdep_dsp_load(snd_hwdep_t *hw, snd_hwdep_dsp_image_t __user *_info)
+{
+	snd_hwdep_dsp_image_t info;
+	int err;
+	
+	if (! hw->ops.dsp_load)
+		return -ENXIO;
+	memset(&info, 0, sizeof(info));
+	if (copy_from_user(&info, _info, sizeof(info)))
+		return -EFAULT;
+	/* check whether the dsp was already loaded */
+	if (hw->dsp_loaded & (1 << info.index))
+		return -EBUSY;
+	if (!access_ok(VERIFY_READ, info.image, info.length))
+		return -EFAULT;
+	err = hw->ops.dsp_load(hw, &info);
+	if (err < 0)
+		return err;
+	hw->dsp_loaded |= (1 << info.index);
+	return 0;
+}
+
+static long snd_hwdep_ioctl(struct file * file, unsigned int cmd, unsigned long arg)
+{
+	snd_hwdep_t *hw = file->private_data;
+	void __user *argp = (void __user *)arg;
+	switch (cmd) {
+	case SNDRV_HWDEP_IOCTL_PVERSION:
+		return put_user(SNDRV_HWDEP_VERSION, (int __user *)argp);
+	case SNDRV_HWDEP_IOCTL_INFO:
+		return snd_hwdep_info(hw, argp);
+	case SNDRV_HWDEP_IOCTL_DSP_STATUS:
+		return snd_hwdep_dsp_status(hw, argp);
+	case SNDRV_HWDEP_IOCTL_DSP_LOAD:
+		return snd_hwdep_dsp_load(hw, argp);
+	}
+	if (hw->ops.ioctl)
+		return hw->ops.ioctl(hw, file, cmd, arg);
+	return -ENOTTY;
+}
+
+static int snd_hwdep_mmap(struct file * file, struct vm_area_struct * vma)
+{
+	snd_hwdep_t *hw = file->private_data;
+	if (hw->ops.mmap)
+		return hw->ops.mmap(hw, file, vma);
+	return -ENXIO;
+}
+
+static int snd_hwdep_control_ioctl(snd_card_t * card, snd_ctl_file_t * control,
+				   unsigned int cmd, unsigned long arg)
+{
+	unsigned int tmp;
+	
+	tmp = card->number * SNDRV_MINOR_HWDEPS;
+	switch (cmd) {
+	case SNDRV_CTL_IOCTL_HWDEP_NEXT_DEVICE:
+		{
+			int device;
+
+			if (get_user(device, (int __user *)arg))
+				return -EFAULT;
+			device = device < 0 ? 0 : device + 1;
+			while (device < SNDRV_MINOR_HWDEPS) {
+				if (snd_hwdep_devices[tmp + device])
+					break;
+				device++;
+			}
+			if (device >= SNDRV_MINOR_HWDEPS)
+				device = -1;
+			if (put_user(device, (int __user *)arg))
+				return -EFAULT;
+			return 0;
+		}
+	case SNDRV_CTL_IOCTL_HWDEP_INFO:
+		{
+			snd_hwdep_info_t __user *info = (snd_hwdep_info_t __user *)arg;
+			int device;
+			snd_hwdep_t *hwdep;
+
+			if (get_user(device, &info->device))
+				return -EFAULT;
+			if (device < 0 || device >= SNDRV_MINOR_HWDEPS)
+				return -ENXIO;
+			hwdep = snd_hwdep_devices[tmp + device];
+			if (hwdep == NULL)
+				return -ENXIO;
+			return snd_hwdep_info(hwdep, info);
+		}
+	}
+	return -ENOIOCTLCMD;
+}
+
+#ifdef CONFIG_COMPAT
+#include "hwdep_compat.c"
+#else
+#define snd_hwdep_ioctl_compat	NULL
+#endif
+
+/*
+
+ */
+
+static struct file_operations snd_hwdep_f_ops =
+{
+	.owner = 	THIS_MODULE,
+	.llseek =	snd_hwdep_llseek,
+	.read = 	snd_hwdep_read,
+	.write =	snd_hwdep_write,
+	.open =		snd_hwdep_open,
+	.release =	snd_hwdep_release,
+	.poll =		snd_hwdep_poll,
+	.unlocked_ioctl =	snd_hwdep_ioctl,
+	.compat_ioctl =	snd_hwdep_ioctl_compat,
+	.mmap =		snd_hwdep_mmap,
+};
+
+static snd_minor_t snd_hwdep_reg =
+{
+	.comment =	"hardware dependent",
+	.f_ops =	&snd_hwdep_f_ops,
+};
+
+/**
+ * snd_hwdep_new - create a new hwdep instance
+ * @card: the card instance
+ * @id: the id string
+ * @device: the device index (zero-based)
+ * @rhwdep: the pointer to store the new hwdep instance
+ *
+ * Creates a new hwdep instance with the given index on the card.
+ * The callbacks (hwdep->ops) must be set on the returned instance
+ * after this call manually by the caller.
+ *
+ * Returns zero if successful, or a negative error code on failure.
+ */
+int snd_hwdep_new(snd_card_t * card, char *id, int device, snd_hwdep_t ** rhwdep)
+{
+	snd_hwdep_t *hwdep;
+	int err;
+	static snd_device_ops_t ops = {
+		.dev_free = snd_hwdep_dev_free,
+		.dev_register = snd_hwdep_dev_register,
+		.dev_unregister = snd_hwdep_dev_unregister
+	};
+
+	snd_assert(rhwdep != NULL, return -EINVAL);
+	*rhwdep = NULL;
+	snd_assert(card != NULL, return -ENXIO);
+	hwdep = kcalloc(1, sizeof(*hwdep), GFP_KERNEL);
+	if (hwdep == NULL)
+		return -ENOMEM;
+	hwdep->card = card;
+	hwdep->device = device;
+	if (id) {
+		strlcpy(hwdep->id, id, sizeof(hwdep->id));
+	}
+#ifdef CONFIG_SND_OSSEMUL
+	hwdep->oss_type = -1;
+#endif
+	if ((err = snd_device_new(card, SNDRV_DEV_HWDEP, hwdep, &ops)) < 0) {
+		snd_hwdep_free(hwdep);
+		return err;
+	}
+	init_waitqueue_head(&hwdep->open_wait);
+	init_MUTEX(&hwdep->open_mutex);
+	*rhwdep = hwdep;
+	return 0;
+}
+
+static int snd_hwdep_free(snd_hwdep_t *hwdep)
+{
+	snd_assert(hwdep != NULL, return -ENXIO);
+	if (hwdep->private_free)
+		hwdep->private_free(hwdep);
+	kfree(hwdep);
+	return 0;
+}
+
+static int snd_hwdep_dev_free(snd_device_t *device)
+{
+	snd_hwdep_t *hwdep = device->device_data;
+	return snd_hwdep_free(hwdep);
+}
+
+static int snd_hwdep_dev_register(snd_device_t *device)
+{
+	snd_hwdep_t *hwdep = device->device_data;
+	int idx, err;
+	char name[32];
+
+	down(&register_mutex);
+	idx = (hwdep->card->number * SNDRV_MINOR_HWDEPS) + hwdep->device;
+	if (snd_hwdep_devices[idx]) {
+		up(&register_mutex);
+		return -EBUSY;
+	}
+	snd_hwdep_devices[idx] = hwdep;
+	sprintf(name, "hwC%iD%i", hwdep->card->number, hwdep->device);
+	if ((err = snd_register_device(SNDRV_DEVICE_TYPE_HWDEP,
+				       hwdep->card, hwdep->device,
+				       &snd_hwdep_reg, name)) < 0) {
+		snd_printk(KERN_ERR "unable to register hardware dependent device %i:%i\n",
+			   hwdep->card->number, hwdep->device);
+		snd_hwdep_devices[idx] = NULL;
+		up(&register_mutex);
+		return err;
+	}
+#ifdef CONFIG_SND_OSSEMUL
+	hwdep->ossreg = 0;
+	if (hwdep->oss_type >= 0) {
+		if ((hwdep->oss_type == SNDRV_OSS_DEVICE_TYPE_DMFM) && (hwdep->device != 0)) {
+			snd_printk (KERN_WARNING "only hwdep device 0 can be registered as OSS direct FM device!\n");
+		} else {
+			if (snd_register_oss_device(hwdep->oss_type,
+						    hwdep->card, hwdep->device,
+						    &snd_hwdep_reg, hwdep->oss_dev) < 0) {
+				snd_printk(KERN_ERR "unable to register OSS compatibility device %i:%i\n",
+					   hwdep->card->number, hwdep->device);
+			} else
+				hwdep->ossreg = 1;
+		}
+	}
+#endif
+	up(&register_mutex);
+	return 0;
+}
+
+static int snd_hwdep_dev_unregister(snd_device_t *device)
+{
+	snd_hwdep_t *hwdep = device->device_data;
+	int idx;
+
+	snd_assert(hwdep != NULL, return -ENXIO);
+	down(&register_mutex);
+	idx = (hwdep->card->number * SNDRV_MINOR_HWDEPS) + hwdep->device;
+	if (snd_hwdep_devices[idx] != hwdep) {
+		up(&register_mutex);
+		return -EINVAL;
+	}
+#ifdef CONFIG_SND_OSSEMUL
+	if (hwdep->ossreg)
+		snd_unregister_oss_device(hwdep->oss_type, hwdep->card, hwdep->device);
+#endif
+	snd_unregister_device(SNDRV_DEVICE_TYPE_HWDEP, hwdep->card, hwdep->device);
+	snd_hwdep_devices[idx] = NULL;
+	up(&register_mutex);
+	return snd_hwdep_free(hwdep);
+}
+
+/*
+ *  Info interface
+ */
+
+static void snd_hwdep_proc_read(snd_info_entry_t *entry,
+				snd_info_buffer_t * buffer)
+{
+	int idx;
+	snd_hwdep_t *hwdep;
+
+	down(&register_mutex);
+	for (idx = 0; idx < SNDRV_CARDS * SNDRV_MINOR_HWDEPS; idx++) {
+		hwdep = snd_hwdep_devices[idx];
+		if (hwdep == NULL)
+			continue;
+		snd_iprintf(buffer, "%02i-%02i: %s\n",
+					idx / SNDRV_MINOR_HWDEPS,
+					idx % SNDRV_MINOR_HWDEPS,
+					hwdep->name);
+	}
+	up(&register_mutex);
+}
+
+/*
+ *  ENTRY functions
+ */
+
+static snd_info_entry_t *snd_hwdep_proc_entry = NULL;
+
+static int __init alsa_hwdep_init(void)
+{
+	snd_info_entry_t *entry;
+
+	memset(snd_hwdep_devices, 0, sizeof(snd_hwdep_devices));
+	if ((entry = snd_info_create_module_entry(THIS_MODULE, "hwdep", NULL)) != NULL) {
+		entry->c.text.read_size = 512;
+		entry->c.text.read = snd_hwdep_proc_read;
+		if (snd_info_register(entry) < 0) {
+			snd_info_free_entry(entry);
+			entry = NULL;
+		}
+	}
+	snd_hwdep_proc_entry = entry;
+	snd_ctl_register_ioctl(snd_hwdep_control_ioctl);
+	snd_ctl_register_ioctl_compat(snd_hwdep_control_ioctl);
+	return 0;
+}
+
+static void __exit alsa_hwdep_exit(void)
+{
+	snd_ctl_unregister_ioctl(snd_hwdep_control_ioctl);
+	snd_ctl_unregister_ioctl_compat(snd_hwdep_control_ioctl);
+	if (snd_hwdep_proc_entry) {
+		snd_info_unregister(snd_hwdep_proc_entry);
+		snd_hwdep_proc_entry = NULL;
+	}
+}
+
+module_init(alsa_hwdep_init)
+module_exit(alsa_hwdep_exit)
+
+EXPORT_SYMBOL(snd_hwdep_new);