Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

28 files changed, 5835 insertions, 0 deletions

diff --git a/drivers/base/Kconfig b/drivers/base/Kconfig
new file mode 100644
index 00000000000..934149c1512
--- /dev/null
+++ b/drivers/base/Kconfig
@@ -0,0 +1,40 @@
+menu "Generic Driver Options"
+
+config STANDALONE
+	bool "Select only drivers that don't need compile-time external firmware" if EXPERIMENTAL
+	default y
+	help
+	  Select this option if you don't have magic firmware for drivers that
+	  need it.
+
+	  If unsure, say Y.
+
+config PREVENT_FIRMWARE_BUILD
+	bool "Prevent firmware from being built"
+	default y
+	help
+	  Say yes to avoid building firmware. Firmware is usually shipped
+	  with the driver, and only when updating the firmware a rebuild
+	  should be made.
+	  If unsure say Y here.
+
+config FW_LOADER
+	tristate "Hotplug firmware loading support"
+	select HOTPLUG
+	---help---
+	  This option is provided for the case where no in-kernel-tree modules
+	  require hotplug firmware loading support, but a module built outside
+	  the kernel tree does.
+
+config DEBUG_DRIVER
+	bool "Driver Core verbose debug messages"
+	depends on DEBUG_KERNEL
+	help
+	  Say Y here if you want the Driver core to produce a bunch of
+	  debug messages to the system log. Select this if you are having a
+	  problem with the driver core and want to see more of what is
+	  going on.
+
+	  If you are unsure about this, say N here.
+
+endmenu
diff --git a/drivers/base/Makefile b/drivers/base/Makefile
new file mode 100644
index 00000000000..6662b545e0a
--- /dev/null
+++ b/drivers/base/Makefile
@@ -0,0 +1,14 @@
+# Makefile for the Linux device tree
+
+obj-y			:= core.o sys.o interface.o bus.o \
+			   driver.o class.o class_simple.o platform.o \
+			   cpu.o firmware.o init.o map.o dmapool.o \
+			   attribute_container.o transport_class.o
+obj-y			+= power/
+obj-$(CONFIG_FW_LOADER)	+= firmware_class.o
+obj-$(CONFIG_NUMA)	+= node.o
+
+ifeq ($(CONFIG_DEBUG_DRIVER),y)
+EXTRA_CFLAGS += -DDEBUG
+endif
+
diff --git a/drivers/base/attribute_container.c b/drivers/base/attribute_container.c
new file mode 100644
index 00000000000..ec615d854be
--- /dev/null
+++ b/drivers/base/attribute_container.c
@@ -0,0 +1,376 @@
+/*
+ * attribute_container.c - implementation of a simple container for classes
+ *
+ * Copyright (c) 2005 - James Bottomley <James.Bottomley@steeleye.com>
+ *
+ * This file is licensed under GPLv2
+ *
+ * The basic idea here is to enable a device to be attached to an
+ * aritrary numer of classes without having to allocate storage for them.
+ * Instead, the contained classes select the devices they need to attach
+ * to via a matching function.
+ */
+
+#include <linux/attribute_container.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/list.h>
+#include <linux/module.h>
+
+/* This is a private structure used to tie the classdev and the
+ * container .. it should never be visible outside this file */
+struct internal_container {
+	struct list_head node;
+	struct attribute_container *cont;
+	struct class_device classdev;
+};
+
+/**
+ * attribute_container_classdev_to_container - given a classdev, return the container
+ *
+ * @classdev: the class device created by attribute_container_add_device.
+ *
+ * Returns the container associated with this classdev.
+ */
+struct attribute_container *
+attribute_container_classdev_to_container(struct class_device *classdev)
+{
+	struct internal_container *ic =
+		container_of(classdev, struct internal_container, classdev);
+	return ic->cont;
+}
+EXPORT_SYMBOL_GPL(attribute_container_classdev_to_container);
+
+static struct list_head attribute_container_list;
+
+static DECLARE_MUTEX(attribute_container_mutex);
+
+/**
+ * attribute_container_register - register an attribute container
+ *
+ * @cont: The container to register.  This must be allocated by the
+ *        callee and should also be zeroed by it.
+ */
+int
+attribute_container_register(struct attribute_container *cont)
+{
+	INIT_LIST_HEAD(&cont->node);
+	INIT_LIST_HEAD(&cont->containers);
+		
+	down(&attribute_container_mutex);
+	list_add_tail(&cont->node, &attribute_container_list);
+	up(&attribute_container_mutex);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(attribute_container_register);
+
+/**
+ * attribute_container_unregister - remove a container registration
+ *
+ * @cont: previously registered container to remove
+ */
+int
+attribute_container_unregister(struct attribute_container *cont)
+{
+	int retval = -EBUSY;
+	down(&attribute_container_mutex);
+	if (!list_empty(&cont->containers))
+		goto out;
+	retval = 0;
+	list_del(&cont->node);
+ out:
+	up(&attribute_container_mutex);
+	return retval;
+		
+}
+EXPORT_SYMBOL_GPL(attribute_container_unregister);
+
+/* private function used as class release */
+static void attribute_container_release(struct class_device *classdev)
+{
+	struct internal_container *ic 
+		= container_of(classdev, struct internal_container, classdev);
+	struct device *dev = classdev->dev;
+
+	kfree(ic);
+	put_device(dev);
+}
+
+/**
+ * attribute_container_add_device - see if any container is interested in dev
+ *
+ * @dev: device to add attributes to
+ * @fn:	 function to trigger addition of class device.
+ *
+ * This function allocates storage for the class device(s) to be
+ * attached to dev (one for each matching attribute_container).  If no
+ * fn is provided, the code will simply register the class device via
+ * class_device_add.  If a function is provided, it is expected to add
+ * the class device at the appropriate time.  One of the things that
+ * might be necessary is to allocate and initialise the classdev and
+ * then add it a later time.  To do this, call this routine for
+ * allocation and initialisation and then use
+ * attribute_container_device_trigger() to call class_device_add() on
+ * it.  Note: after this, the class device contains a reference to dev
+ * which is not relinquished until the release of the classdev.
+ */
+void
+attribute_container_add_device(struct device *dev,
+			       int (*fn)(struct attribute_container *,
+					 struct device *,
+					 struct class_device *))
+{
+	struct attribute_container *cont;
+
+	down(&attribute_container_mutex);
+	list_for_each_entry(cont, &attribute_container_list, node) {
+		struct internal_container *ic;
+
+		if (attribute_container_no_classdevs(cont))
+			continue;
+
+		if (!cont->match(cont, dev))
+			continue;
+		ic = kmalloc(sizeof(struct internal_container), GFP_KERNEL);
+		if (!ic) {
+			dev_printk(KERN_ERR, dev, "failed to allocate class container\n");
+			continue;
+		}
+		memset(ic, 0, sizeof(struct internal_container));
+		INIT_LIST_HEAD(&ic->node);
+		ic->cont = cont;
+		class_device_initialize(&ic->classdev);
+		ic->classdev.dev = get_device(dev);
+		ic->classdev.class = cont->class;
+		cont->class->release = attribute_container_release;
+		strcpy(ic->classdev.class_id, dev->bus_id);
+		if (fn)
+			fn(cont, dev, &ic->classdev);
+		else
+			attribute_container_add_class_device(&ic->classdev);
+		list_add_tail(&ic->node, &cont->containers);
+	}
+	up(&attribute_container_mutex);
+}
+
+/**
+ * attribute_container_remove_device - make device eligible for removal.
+ *
+ * @dev:  The generic device
+ * @fn:	  A function to call to remove the device
+ *
+ * This routine triggers device removal.  If fn is NULL, then it is
+ * simply done via class_device_unregister (note that if something
+ * still has a reference to the classdev, then the memory occupied
+ * will not be freed until the classdev is released).  If you want a
+ * two phase release: remove from visibility and then delete the
+ * device, then you should use this routine with a fn that calls
+ * class_device_del() and then use
+ * attribute_container_device_trigger() to do the final put on the
+ * classdev.
+ */
+void
+attribute_container_remove_device(struct device *dev,
+				  void (*fn)(struct attribute_container *,
+					     struct device *,
+					     struct class_device *))
+{
+	struct attribute_container *cont;
+
+	down(&attribute_container_mutex);
+	list_for_each_entry(cont, &attribute_container_list, node) {
+		struct internal_container *ic, *tmp;
+
+		if (attribute_container_no_classdevs(cont))
+			continue;
+
+		if (!cont->match(cont, dev))
+			continue;
+		list_for_each_entry_safe(ic, tmp, &cont->containers, node) {
+			if (dev != ic->classdev.dev)
+				continue;
+			list_del(&ic->node);
+			if (fn)
+				fn(cont, dev, &ic->classdev);
+			else {
+				attribute_container_remove_attrs(&ic->classdev);
+				class_device_unregister(&ic->classdev);
+			}
+		}
+	}
+	up(&attribute_container_mutex);
+}
+EXPORT_SYMBOL_GPL(attribute_container_remove_device);
+
+/**
+ * attribute_container_device_trigger - execute a trigger for each matching classdev
+ *
+ * @dev:  The generic device to run the trigger for
+ * @fn	  the function to execute for each classdev.
+ *
+ * This funcion is for executing a trigger when you need to know both
+ * the container and the classdev.  If you only care about the
+ * container, then use attribute_container_trigger() instead.
+ */
+void
+attribute_container_device_trigger(struct device *dev, 
+				   int (*fn)(struct attribute_container *,
+					     struct device *,
+					     struct class_device *))
+{
+	struct attribute_container *cont;
+
+	down(&attribute_container_mutex);
+	list_for_each_entry(cont, &attribute_container_list, node) {
+		struct internal_container *ic, *tmp;
+
+		if (!cont->match(cont, dev))
+			continue;
+
+		list_for_each_entry_safe(ic, tmp, &cont->containers, node) {
+			if (dev == ic->classdev.dev)
+				fn(cont, dev, &ic->classdev);
+		}
+	}
+	up(&attribute_container_mutex);
+}
+EXPORT_SYMBOL_GPL(attribute_container_device_trigger);
+
+/**
+ * attribute_container_trigger - trigger a function for each matching container
+ *
+ * @dev:  The generic device to activate the trigger for
+ * @fn:	  the function to trigger
+ *
+ * This routine triggers a function that only needs to know the
+ * matching containers (not the classdev) associated with a device.
+ * It is more lightweight than attribute_container_device_trigger, so
+ * should be used in preference unless the triggering function
+ * actually needs to know the classdev.
+ */
+void
+attribute_container_trigger(struct device *dev,
+			    int (*fn)(struct attribute_container *,
+				      struct device *))
+{
+	struct attribute_container *cont;
+
+	down(&attribute_container_mutex);
+	list_for_each_entry(cont, &attribute_container_list, node) {
+		if (cont->match(cont, dev))
+			fn(cont, dev);
+	}
+	up(&attribute_container_mutex);
+}
+EXPORT_SYMBOL_GPL(attribute_container_trigger);
+
+/**
+ * attribute_container_add_attrs - add attributes
+ *
+ * @classdev: The class device
+ *
+ * This simply creates all the class device sysfs files from the
+ * attributes listed in the container
+ */
+int
+attribute_container_add_attrs(struct class_device *classdev)
+{
+	struct attribute_container *cont =
+		attribute_container_classdev_to_container(classdev);
+	struct class_device_attribute **attrs =	cont->attrs;
+	int i, error;
+
+	if (!attrs)
+		return 0;
+
+	for (i = 0; attrs[i]; i++) {
+		error = class_device_create_file(classdev, attrs[i]);
+		if (error)
+			return error;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(attribute_container_add_attrs);
+
+/**
+ * attribute_container_add_class_device - same function as class_device_add
+ *
+ * @classdev:	the class device to add
+ *
+ * This performs essentially the same function as class_device_add except for
+ * attribute containers, namely add the classdev to the system and then
+ * create the attribute files
+ */
+int
+attribute_container_add_class_device(struct class_device *classdev)
+{
+	int error = class_device_add(classdev);
+	if (error)
+		return error;
+	return attribute_container_add_attrs(classdev);
+}
+EXPORT_SYMBOL_GPL(attribute_container_add_class_device);
+
+/**
+ * attribute_container_add_class_device_adapter - simple adapter for triggers
+ *
+ * This function is identical to attribute_container_add_class_device except
+ * that it is designed to be called from the triggers
+ */
+int
+attribute_container_add_class_device_adapter(struct attribute_container *cont,
+					     struct device *dev,
+					     struct class_device *classdev)
+{
+	return attribute_container_add_class_device(classdev);
+}
+EXPORT_SYMBOL_GPL(attribute_container_add_class_device_adapter);
+
+/**
+ * attribute_container_remove_attrs - remove any attribute files
+ *
+ * @classdev: The class device to remove the files from
+ *
+ */
+void
+attribute_container_remove_attrs(struct class_device *classdev)
+{
+	struct attribute_container *cont =
+		attribute_container_classdev_to_container(classdev);
+	struct class_device_attribute **attrs =	cont->attrs;
+	int i;
+
+	if (!attrs)
+		return;
+
+	for (i = 0; attrs[i]; i++)
+		class_device_remove_file(classdev, attrs[i]);
+}
+EXPORT_SYMBOL_GPL(attribute_container_remove_attrs);
+
+/**
+ * attribute_container_class_device_del - equivalent of class_device_del
+ *
+ * @classdev: the class device
+ *
+ * This function simply removes all the attribute files and then calls
+ * class_device_del.
+ */
+void
+attribute_container_class_device_del(struct class_device *classdev)
+{
+	attribute_container_remove_attrs(classdev);
+	class_device_del(classdev);
+}
+EXPORT_SYMBOL_GPL(attribute_container_class_device_del);
+
+int __init
+attribute_container_init(void)
+{
+	INIT_LIST_HEAD(&attribute_container_list);
+	return 0;
+}
diff --git a/drivers/base/base.h b/drivers/base/base.h
new file mode 100644
index 00000000000..8d1e8bd4863
--- /dev/null
+++ b/drivers/base/base.h
@@ -0,0 +1,18 @@
+extern int bus_add_device(struct device * dev);
+extern void bus_remove_device(struct device * dev);
+
+extern int bus_add_driver(struct device_driver *);
+extern void bus_remove_driver(struct device_driver *);
+
+static inline struct class_device *to_class_dev(struct kobject *obj)
+{
+	return container_of(obj, struct class_device, kobj);
+}
+
+static inline
+struct class_device_attribute *to_class_dev_attr(struct attribute *_attr)
+{
+	return container_of(_attr, struct class_device_attribute, attr);
+}
+
+
diff --git a/drivers/base/bus.c b/drivers/base/bus.c
new file mode 100644
index 00000000000..f4fa27315fb
--- /dev/null
+++ b/drivers/base/bus.c
@@ -0,0 +1,770 @@
+/*
+ * bus.c - bus driver management
+ *
+ * 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/module.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/string.h>
+#include "base.h"
+#include "power/power.h"
+
+#define to_dev(node) container_of(node, struct device, bus_list)
+#define to_drv(node) container_of(node, struct device_driver, kobj.entry)
+
+#define to_bus_attr(_attr) container_of(_attr, struct bus_attribute, attr)
+#define to_bus(obj) container_of(obj, struct bus_type, subsys.kset.kobj)
+
+/*
+ * sysfs bindings for drivers
+ */
+
+#define to_drv_attr(_attr) container_of(_attr, struct driver_attribute, attr)
+#define to_driver(obj) container_of(obj, struct device_driver, kobj)
+
+
+static ssize_t
+drv_attr_show(struct kobject * kobj, struct attribute * attr, char * buf)
+{
+	struct driver_attribute * drv_attr = to_drv_attr(attr);
+	struct device_driver * drv = to_driver(kobj);
+	ssize_t ret = 0;
+
+	if (drv_attr->show)
+		ret = drv_attr->show(drv, buf);
+	return ret;
+}
+
+static ssize_t
+drv_attr_store(struct kobject * kobj, struct attribute * attr,
+	       const char * buf, size_t count)
+{
+	struct driver_attribute * drv_attr = to_drv_attr(attr);
+	struct device_driver * drv = to_driver(kobj);
+	ssize_t ret = 0;
+
+	if (drv_attr->store)
+		ret = drv_attr->store(drv, buf, count);
+	return ret;
+}
+
+static struct sysfs_ops driver_sysfs_ops = {
+	.show	= drv_attr_show,
+	.store	= drv_attr_store,
+};
+
+
+static void driver_release(struct kobject * kobj)
+{
+	struct device_driver * drv = to_driver(kobj);
+	complete(&drv->unloaded);
+}
+
+static struct kobj_type ktype_driver = {
+	.sysfs_ops	= &driver_sysfs_ops,
+	.release	= driver_release,
+};
+
+
+/*
+ * sysfs bindings for buses
+ */
+
+
+static ssize_t
+bus_attr_show(struct kobject * kobj, struct attribute * attr, char * buf)
+{
+	struct bus_attribute * bus_attr = to_bus_attr(attr);
+	struct bus_type * bus = to_bus(kobj);
+	ssize_t ret = 0;
+
+	if (bus_attr->show)
+		ret = bus_attr->show(bus, buf);
+	return ret;
+}
+
+static ssize_t
+bus_attr_store(struct kobject * kobj, struct attribute * attr,
+	       const char * buf, size_t count)
+{
+	struct bus_attribute * bus_attr = to_bus_attr(attr);
+	struct bus_type * bus = to_bus(kobj);
+	ssize_t ret = 0;
+
+	if (bus_attr->store)
+		ret = bus_attr->store(bus, buf, count);
+	return ret;
+}
+
+static struct sysfs_ops bus_sysfs_ops = {
+	.show	= bus_attr_show,
+	.store	= bus_attr_store,
+};
+
+int bus_create_file(struct bus_type * bus, struct bus_attribute * attr)
+{
+	int error;
+	if (get_bus(bus)) {
+		error = sysfs_create_file(&bus->subsys.kset.kobj, &attr->attr);
+		put_bus(bus);
+	} else
+		error = -EINVAL;
+	return error;
+}
+
+void bus_remove_file(struct bus_type * bus, struct bus_attribute * attr)
+{
+	if (get_bus(bus)) {
+		sysfs_remove_file(&bus->subsys.kset.kobj, &attr->attr);
+		put_bus(bus);
+	}
+}
+
+static struct kobj_type ktype_bus = {
+	.sysfs_ops	= &bus_sysfs_ops,
+
+};
+
+decl_subsys(bus, &ktype_bus, NULL);
+
+static int __bus_for_each_dev(struct bus_type *bus, struct device *start,
+			      void *data, int (*fn)(struct device *, void *))
+{
+	struct list_head *head;
+	struct device *dev;
+	int error = 0;
+
+	if (!(bus = get_bus(bus)))
+		return -EINVAL;
+
+	head = &bus->devices.list;
+	dev = list_prepare_entry(start, head, bus_list);
+	list_for_each_entry_continue(dev, head, bus_list) {
+		get_device(dev);
+		error = fn(dev, data);
+		put_device(dev);
+		if (error)
+			break;
+	}
+	put_bus(bus);
+	return error;
+}
+
+static int __bus_for_each_drv(struct bus_type *bus, struct device_driver *start,
+			      void * data, int (*fn)(struct device_driver *, void *))
+{
+	struct list_head *head;
+	struct device_driver *drv;
+	int error = 0;
+
+	if (!(bus = get_bus(bus)))
+		return -EINVAL;
+
+	head = &bus->drivers.list;
+	drv = list_prepare_entry(start, head, kobj.entry);
+	list_for_each_entry_continue(drv, head, kobj.entry) {
+		get_driver(drv);
+		error = fn(drv, data);
+		put_driver(drv);
+		if (error)
+			break;
+	}
+	put_bus(bus);
+	return error;
+}
+
+/**
+ *	bus_for_each_dev - device iterator.
+ *	@bus:	bus type.
+ *	@start:	device to start iterating from.
+ *	@data:	data for the callback.
+ *	@fn:	function to be called for each device.
+ *
+ *	Iterate over @bus's list of devices, and call @fn for each,
+ *	passing it @data. If @start is not NULL, we use that device to
+ *	begin iterating from.
+ *
+ *	We check the return of @fn each time. If it returns anything
+ *	other than 0, we break out and return that value.
+ *
+ *	NOTE: The device that returns a non-zero value is not retained
+ *	in any way, nor is its refcount incremented. If the caller needs
+ *	to retain this data, it should do, and increment the reference
+ *	count in the supplied callback.
+ */
+
+int bus_for_each_dev(struct bus_type * bus, struct device * start,
+		     void * data, int (*fn)(struct device *, void *))
+{
+	int ret;
+
+	down_read(&bus->subsys.rwsem);
+	ret = __bus_for_each_dev(bus, start, data, fn);
+	up_read(&bus->subsys.rwsem);
+	return ret;
+}
+
+/**
+ *	bus_for_each_drv - driver iterator
+ *	@bus:	bus we're dealing with.
+ *	@start:	driver to start iterating on.
+ *	@data:	data to pass to the callback.
+ *	@fn:	function to call for each driver.
+ *
+ *	This is nearly identical to the device iterator above.
+ *	We iterate over each driver that belongs to @bus, and call
+ *	@fn for each. If @fn returns anything but 0, we break out
+ *	and return it. If @start is not NULL, we use it as the head
+ *	of the list.
+ *
+ *	NOTE: we don't return the driver that returns a non-zero
+ *	value, nor do we leave the reference count incremented for that
+ *	driver. If the caller needs to know that info, it must set it
+ *	in the callback. It must also be sure to increment the refcount
+ *	so it doesn't disappear before returning to the caller.
+ */
+
+int bus_for_each_drv(struct bus_type * bus, struct device_driver * start,
+		     void * data, int (*fn)(struct device_driver *, void *))
+{
+	int ret;
+
+	down_read(&bus->subsys.rwsem);
+	ret = __bus_for_each_drv(bus, start, data, fn);
+	up_read(&bus->subsys.rwsem);
+	return ret;
+}
+
+/**
+ *	device_bind_driver - bind a driver to one device.
+ *	@dev:	device.
+ *
+ *	Allow manual attachment of a driver to a device.
+ *	Caller must have already set @dev->driver.
+ *
+ *	Note that this does not modify the bus reference count
+ *	nor take the bus's rwsem. Please verify those are accounted
+ *	for before calling this. (It is ok to call with no other effort
+ *	from a driver's probe() method.)
+ */
+
+void device_bind_driver(struct device * dev)
+{
+	pr_debug("bound device '%s' to driver '%s'\n",
+		 dev->bus_id, dev->driver->name);
+	list_add_tail(&dev->driver_list, &dev->driver->devices);
+	sysfs_create_link(&dev->driver->kobj, &dev->kobj,
+			  kobject_name(&dev->kobj));
+	sysfs_create_link(&dev->kobj, &dev->driver->kobj, "driver");
+}
+
+
+/**
+ *	driver_probe_device - attempt to bind device & driver.
+ *	@drv:	driver.
+ *	@dev:	device.
+ *
+ *	First, we call the bus's match function, if one present, which
+ *	should compare the device IDs the driver supports with the
+ *	device IDs of the device. Note we don't do this ourselves
+ *	because we don't know the format of the ID structures, nor what
+ *	is to be considered a match and what is not.
+ *
+ *	If we find a match, we call @drv->probe(@dev) if it exists, and
+ *	call device_bind_driver() above.
+ */
+int driver_probe_device(struct device_driver * drv, struct device * dev)
+{
+	if (drv->bus->match && !drv->bus->match(dev, drv))
+		return -ENODEV;
+
+	dev->driver = drv;
+	if (drv->probe) {
+		int error = drv->probe(dev);
+		if (error) {
+			dev->driver = NULL;
+			return error;
+		}
+	}
+
+	device_bind_driver(dev);
+	return 0;
+}
+
+
+/**
+ *	device_attach - try to attach device to a driver.
+ *	@dev:	device.
+ *
+ *	Walk the list of drivers that the bus has and call
+ *	driver_probe_device() for each pair. If a compatible
+ *	pair is found, break out and return.
+ */
+int device_attach(struct device * dev)
+{
+ 	struct bus_type * bus = dev->bus;
+	struct list_head * entry;
+	int error;
+
+	if (dev->driver) {
+		device_bind_driver(dev);
+		return 1;
+	}
+
+	if (bus->match) {
+		list_for_each(entry, &bus->drivers.list) {
+			struct device_driver * drv = to_drv(entry);
+			error = driver_probe_device(drv, dev);
+			if (!error)
+				/* success, driver matched */
+				return 1;
+			if (error != -ENODEV && error != -ENXIO)
+				/* driver matched but the probe failed */
+				printk(KERN_WARNING
+				    "%s: probe of %s failed with error %d\n",
+				    drv->name, dev->bus_id, error);
+		}
+	}
+
+	return 0;
+}
+
+
+/**
+ *	driver_attach - try to bind driver to devices.
+ *	@drv:	driver.
+ *
+ *	Walk the list of devices that the bus has on it and try to
+ *	match the driver with each one.  If driver_probe_device()
+ *	returns 0 and the @dev->driver is set, we've found a
+ *	compatible pair.
+ *
+ *	Note that we ignore the -ENODEV error from driver_probe_device(),
+ *	since it's perfectly valid for a driver not to bind to any devices.
+ */
+void driver_attach(struct device_driver * drv)
+{
+	struct bus_type * bus = drv->bus;
+	struct list_head * entry;
+	int error;
+
+	if (!bus->match)
+		return;
+
+	list_for_each(entry, &bus->devices.list) {
+		struct device * dev = container_of(entry, struct device, bus_list);
+		if (!dev->driver) {
+			error = driver_probe_device(drv, dev);
+			if (error && (error != -ENODEV))
+				/* driver matched but the probe failed */
+				printk(KERN_WARNING
+				    "%s: probe of %s failed with error %d\n",
+				    drv->name, dev->bus_id, error);
+		}
+	}
+}
+
+
+/**
+ *	device_release_driver - manually detach device from driver.
+ *	@dev:	device.
+ *
+ *	Manually detach device from driver.
+ *	Note that this is called without incrementing the bus
+ *	reference count nor taking the bus's rwsem. Be sure that
+ *	those are accounted for before calling this function.
+ */
+
+void device_release_driver(struct device * dev)
+{
+	struct device_driver * drv = dev->driver;
+	if (drv) {
+		sysfs_remove_link(&drv->kobj, kobject_name(&dev->kobj));
+		sysfs_remove_link(&dev->kobj, "driver");
+		list_del_init(&dev->driver_list);
+		device_detach_shutdown(dev);
+		if (drv->remove)
+			drv->remove(dev);
+		dev->driver = NULL;
+	}
+}
+
+
+/**
+ *	driver_detach - detach driver from all devices it controls.
+ *	@drv:	driver.
+ */
+
+static void driver_detach(struct device_driver * drv)
+{
+	struct list_head * entry, * next;
+	list_for_each_safe(entry, next, &drv->devices) {
+		struct device * dev = container_of(entry, struct device, driver_list);
+		device_release_driver(dev);
+	}
+}
+
+static int device_add_attrs(struct bus_type * bus, struct device * dev)
+{
+	int error = 0;
+	int i;
+
+	if (bus->dev_attrs) {
+		for (i = 0; attr_name(bus->dev_attrs[i]); i++) {
+			error = device_create_file(dev,&bus->dev_attrs[i]);
+			if (error)
+				goto Err;
+		}
+	}
+ Done:
+	return error;
+ Err:
+	while (--i >= 0)
+		device_remove_file(dev,&bus->dev_attrs[i]);
+	goto Done;
+}
+
+
+static void device_remove_attrs(struct bus_type * bus, struct device * dev)
+{
+	int i;
+
+	if (bus->dev_attrs) {
+		for (i = 0; attr_name(bus->dev_attrs[i]); i++)
+			device_remove_file(dev,&bus->dev_attrs[i]);
+	}
+}
+
+
+/**
+ *	bus_add_device - add device to bus
+ *	@dev:	device being added
+ *
+ *	- Add the device to its bus's list of devices.
+ *	- Try to attach to driver.
+ *	- Create link to device's physical location.
+ */
+int bus_add_device(struct device * dev)
+{
+	struct bus_type