diff --git a/drivers/base/core.c b/drivers/base/core.c
new file mode 100644
index 0000000..4e6cce8
--- /dev/null
+++ b/drivers/base/core.c
@@ -0,0 +1,439 @@
+/*
+ * drivers/base/core.c - core driver model code (device registration, etc)
+ *
+ * Copyright (c) 2002-3 Patrick Mochel
+ * Copyright (c) 2002-3 Open Source Development Labs
+ *
+ * This file is released under the GPLv2
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+
+#include <asm/semaphore.h>
+
+#include "base.h"
+#include "power/power.h"
+
+int (*platform_notify)(struct device * dev) = NULL;
+int (*platform_notify_remove)(struct device * dev) = NULL;
+
+/*
+ * sysfs bindings for devices.
+ */
+
+#define to_dev(obj) container_of(obj, struct device, kobj)
+#define to_dev_attr(_attr) container_of(_attr, struct device_attribute, attr)
+
+extern struct attribute * dev_default_attrs[];
+
+static ssize_t
+dev_attr_show(struct kobject * kobj, struct attribute * attr, char * buf)
+{
+	struct device_attribute * dev_attr = to_dev_attr(attr);
+	struct device * dev = to_dev(kobj);
+	ssize_t ret = 0;
+
+	if (dev_attr->show)
+		ret = dev_attr->show(dev, buf);
+	return ret;
+}
+
+static ssize_t
+dev_attr_store(struct kobject * kobj, struct attribute * attr,
+	       const char * buf, size_t count)
+{
+	struct device_attribute * dev_attr = to_dev_attr(attr);
+	struct device * dev = to_dev(kobj);
+	ssize_t ret = 0;
+
+	if (dev_attr->store)
+		ret = dev_attr->store(dev, buf, count);
+	return ret;
+}
+
+static struct sysfs_ops dev_sysfs_ops = {
+	.show	= dev_attr_show,
+	.store	= dev_attr_store,
+};
+
+
+/**
+ *	device_release - free device structure.
+ *	@kobj:	device's kobject.
+ *
+ *	This is called once the reference count for the object
+ *	reaches 0. We forward the call to the device's release
+ *	method, which should handle actually freeing the structure.
+ */
+static void device_release(struct kobject * kobj)
+{
+	struct device * dev = to_dev(kobj);
+
+	if (dev->release)
+		dev->release(dev);
+	else {
+		printk(KERN_ERR "Device '%s' does not have a release() function, "
+			"it is broken and must be fixed.\n",
+			dev->bus_id);
+		WARN_ON(1);
+	}
+}
+
+static struct kobj_type ktype_device = {
+	.release	= device_release,
+	.sysfs_ops	= &dev_sysfs_ops,
+	.default_attrs	= dev_default_attrs,
+};
+
+
+static int dev_hotplug_filter(struct kset *kset, struct kobject *kobj)
+{
+	struct kobj_type *ktype = get_ktype(kobj);
+
+	if (ktype == &ktype_device) {
+		struct device *dev = to_dev(kobj);
+		if (dev->bus)
+			return 1;
+	}
+	return 0;
+}
+
+static char *dev_hotplug_name(struct kset *kset, struct kobject *kobj)
+{
+	struct device *dev = to_dev(kobj);
+
+	return dev->bus->name;
+}
+
+static int dev_hotplug(struct kset *kset, struct kobject *kobj, char **envp,
+			int num_envp, char *buffer, int buffer_size)
+{
+	struct device *dev = to_dev(kobj);
+	int i = 0;
+	int length = 0;
+	int retval = 0;
+
+	/* add bus name of physical device */
+	if (dev->bus)
+		add_hotplug_env_var(envp, num_envp, &i,
+				    buffer, buffer_size, &length,
+				    "PHYSDEVBUS=%s", dev->bus->name);
+
+	/* add driver name of physical device */
+	if (dev->driver)
+		add_hotplug_env_var(envp, num_envp, &i,
+				    buffer, buffer_size, &length,
+				    "PHYSDEVDRIVER=%s", dev->driver->name);
+
+	/* terminate, set to next free slot, shrink available space */
+	envp[i] = NULL;
+	envp = &envp[i];
+	num_envp -= i;
+	buffer = &buffer[length];
+	buffer_size -= length;
+
+	if (dev->bus->hotplug) {
+		/* have the bus specific function add its stuff */
+		retval = dev->bus->hotplug (dev, envp, num_envp, buffer, buffer_size);
+			if (retval) {
+			pr_debug ("%s - hotplug() returned %d\n",
+				  __FUNCTION__, retval);
+		}
+	}
+
+	return retval;
+}
+
+static struct kset_hotplug_ops device_hotplug_ops = {
+	.filter =	dev_hotplug_filter,
+	.name =		dev_hotplug_name,
+	.hotplug =	dev_hotplug,
+};
+
+/**
+ *	device_subsys - structure to be registered with kobject core.
+ */
+
+decl_subsys(devices, &ktype_device, &device_hotplug_ops);
+
+
+/**
+ *	device_create_file - create sysfs attribute file for device.
+ *	@dev:	device.
+ *	@attr:	device attribute descriptor.
+ */
+
+int device_create_file(struct device * dev, struct device_attribute * attr)
+{
+	int error = 0;
+	if (get_device(dev)) {
+		error = sysfs_create_file(&dev->kobj, &attr->attr);
+		put_device(dev);
+	}
+	return error;
+}
+
+/**
+ *	device_remove_file - remove sysfs attribute file.
+ *	@dev:	device.
+ *	@attr:	device attribute descriptor.
+ */
+
+void device_remove_file(struct device * dev, struct device_attribute * attr)
+{
+	if (get_device(dev)) {
+		sysfs_remove_file(&dev->kobj, &attr->attr);
+		put_device(dev);
+	}
+}
+
+
+/**
+ *	device_initialize - init device structure.
+ *	@dev:	device.
+ *
+ *	This prepares the device for use by other layers,
+ *	including adding it to the device hierarchy.
+ *	It is the first half of device_register(), if called by
+ *	that, though it can also be called separately, so one
+ *	may use @dev's fields (e.g. the refcount).
+ */
+
+void device_initialize(struct device *dev)
+{
+	kobj_set_kset_s(dev, devices_subsys);
+	kobject_init(&dev->kobj);
+	INIT_LIST_HEAD(&dev->node);
+	INIT_LIST_HEAD(&dev->children);
+	INIT_LIST_HEAD(&dev->driver_list);
+	INIT_LIST_HEAD(&dev->bus_list);
+	INIT_LIST_HEAD(&dev->dma_pools);
+}
+
+/**
+ *	device_add - add device to device hierarchy.
+ *	@dev:	device.
+ *
+ *	This is part 2 of device_register(), though may be called
+ *	separately _iff_ device_initialize() has been called separately.
+ *
+ *	This adds it to the kobject hierarchy via kobject_add(), adds it
+ *	to the global and sibling lists for the device, then
+ *	adds it to the other relevant subsystems of the driver model.
+ */
+int device_add(struct device *dev)
+{
+	struct device *parent = NULL;
+	int error = -EINVAL;
+
+	dev = get_device(dev);
+	if (!dev || !strlen(dev->bus_id))
+		goto Error;
+
+	parent = get_device(dev->parent);
+
+	pr_debug("DEV: registering device: ID = '%s'\n", dev->bus_id);
+
+	/* first, register with generic layer. */
+	kobject_set_name(&dev->kobj, "%s", dev->bus_id);
+	if (parent)
+		dev->kobj.parent = &parent->kobj;
+
+	if ((error = kobject_add(&dev->kobj)))
+		goto Error;
+	if ((error = device_pm_add(dev)))
+		goto PMError;
+	if ((error = bus_add_device(dev)))
+		goto BusError;
+	down_write(&devices_subsys.rwsem);
+	if (parent)
+		list_add_tail(&dev->node, &parent->children);
+	up_write(&devices_subsys.rwsem);
+
+	/* notify platform of device entry */
+	if (platform_notify)
+		platform_notify(dev);
+ Done:
+	put_device(dev);
+	return error;
+ BusError:
+	device_pm_remove(dev);
+ PMError:
+	kobject_del(&dev->kobj);
+ Error:
+	if (parent)
+		put_device(parent);
+	goto Done;
+}
+
+
+/**
+ *	device_register - register a device with the system.
+ *	@dev:	pointer to the device structure
+ *
+ *	This happens in two clean steps - initialize the device
+ *	and add it to the system. The two steps can be called
+ *	separately, but this is the easiest and most common.
+ *	I.e. you should only call the two helpers separately if
+ *	have a clearly defined need to use and refcount the device
+ *	before it is added to the hierarchy.
+ */
+
+int device_register(struct device *dev)
+{
+	device_initialize(dev);
+	return device_add(dev);
+}
+
+
+/**
+ *	get_device - increment reference count for device.
+ *	@dev:	device.
+ *
+ *	This simply forwards the call to kobject_get(), though
+ *	we do take care to provide for the case that we get a NULL
+ *	pointer passed in.
+ */
+
+struct device * get_device(struct device * dev)
+{
+	return dev ? to_dev(kobject_get(&dev->kobj)) : NULL;
+}
+
+
+/**
+ *	put_device - decrement reference count.
+ *	@dev:	device in question.
+ */
+void put_device(struct device * dev)
+{
+	if (dev)
+		kobject_put(&dev->kobj);
+}
+
+
+/**
+ *	device_del - delete device from system.
+ *	@dev:	device.
+ *
+ *	This is the first part of the device unregistration
+ *	sequence. This removes the device from the lists we control
+ *	from here, has it removed from the other driver model
+ *	subsystems it was added to in device_add(), and removes it
+ *	from the kobject hierarchy.
+ *
+ *	NOTE: this should be called manually _iff_ device_add() was
+ *	also called manually.
+ */
+
+void device_del(struct device * dev)
+{
+	struct device * parent = dev->parent;
+
+	down_write(&devices_subsys.rwsem);
+	if (parent)
+		list_del_init(&dev->node);
+	up_write(&devices_subsys.rwsem);
+
+	/* Notify the platform of the removal, in case they
+	 * need to do anything...
+	 */
+	if (platform_notify_remove)
+		platform_notify_remove(dev);
+	bus_remove_device(dev);
+	device_pm_remove(dev);
+	kobject_del(&dev->kobj);
+	if (parent)
+		put_device(parent);
+}
+
+/**
+ *	device_unregister - unregister device from system.
+ *	@dev:	device going away.
+ *
+ *	We do this in two parts, like we do device_register(). First,
+ *	we remove it from all the subsystems with device_del(), then
+ *	we decrement the reference count via put_device(). If that
+ *	is the final reference count, the device will be cleaned up
+ *	via device_release() above. Otherwise, the structure will
+ *	stick around until the final reference to the device is dropped.
+ */
+void device_unregister(struct device * dev)
+{
+	pr_debug("DEV: Unregistering device. ID = '%s'\n", dev->bus_id);
+	device_del(dev);
+	put_device(dev);
+}
+
+
+/**
+ *	device_for_each_child - device child iterator.
+ *	@dev:	parent struct device.
+ *	@data:	data for the callback.
+ *	@fn:	function to be called for each device.
+ *
+ *	Iterate over @dev's child devices, and call @fn for each,
+ *	passing it @data.
+ *
+ *	We check the return of @fn each time. If it returns anything
+ *	other than 0, we break out and return that value.
+ */
+int device_for_each_child(struct device * dev, void * data,
+		     int (*fn)(struct device *, void *))
+{
+	struct device * child;
+	int error = 0;
+
+	down_read(&devices_subsys.rwsem);
+	list_for_each_entry(child, &dev->children, node) {
+		if((error = fn(child, data)))
+			break;
+	}
+	up_read(&devices_subsys.rwsem);
+	return error;
+}
+
+/**
+ *	device_find - locate device on a bus by name.
+ *	@name:	name of the device.
+ *	@bus:	bus to scan for the device.
+ *
+ *	Call kset_find_obj() to iterate over list of devices on
+ *	a bus to find device by name. Return device if found.
+ *
+ *	Note that kset_find_obj increments device's reference count.
+ */
+struct device *device_find(const char *name, struct bus_type *bus)
+{
+	struct kobject *k = kset_find_obj(&bus->devices, name);
+	if (k)
+		return to_dev(k);
+	return NULL;
+}
+
+int __init devices_init(void)
+{
+	return subsystem_register(&devices_subsys);
+}
+
+EXPORT_SYMBOL_GPL(device_for_each_child);
+
+EXPORT_SYMBOL_GPL(device_initialize);
+EXPORT_SYMBOL_GPL(device_add);
+EXPORT_SYMBOL_GPL(device_register);
+
+EXPORT_SYMBOL_GPL(device_del);
+EXPORT_SYMBOL_GPL(device_unregister);
+EXPORT_SYMBOL_GPL(get_device);
+EXPORT_SYMBOL_GPL(put_device);
+EXPORT_SYMBOL_GPL(device_find);
+
+EXPORT_SYMBOL_GPL(device_create_file);
+EXPORT_SYMBOL_GPL(device_remove_file);