Merge rsync://rsync.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6

17 files changed, 856 insertions, 73 deletions

diff --git a/drivers/base/Kconfig b/drivers/base/Kconfig
index f0eff3dac58d..80502dc6ed66 100644
--- a/drivers/base/Kconfig
+++ b/drivers/base/Kconfig
@@ -38,3 +38,7 @@ config DEBUG_DRIVER
 	  If you are unsure about this, say N here.
 
 endmenu
+
+config SYS_HYPERVISOR
+	bool
+	default n
diff --git a/drivers/base/Makefile b/drivers/base/Makefile
index e99471d3232b..b539e5e75b56 100644
--- a/drivers/base/Makefile
+++ b/drivers/base/Makefile
@@ -5,10 +5,12 @@ obj-y			:= core.o sys.o bus.o dd.o \
 			   cpu.o firmware.o init.o map.o dmapool.o \
 			   attribute_container.o transport_class.o
 obj-y			+= power/
+obj-$(CONFIG_ISA)	+= isa.o
 obj-$(CONFIG_FW_LOADER)	+= firmware_class.o
 obj-$(CONFIG_NUMA)	+= node.o
 obj-$(CONFIG_MEMORY_HOTPLUG) += memory.o
 obj-$(CONFIG_SMP)	+= topology.o
+obj-$(CONFIG_SYS_HYPERVISOR) += hypervisor.o
 
 ifeq ($(CONFIG_DEBUG_DRIVER),y)
 EXTRA_CFLAGS += -DDEBUG
diff --git a/drivers/base/attribute_container.c b/drivers/base/attribute_container.c
index 2a7d7ae83e1e..22220733f76f 100644
--- a/drivers/base/attribute_container.c
+++ b/drivers/base/attribute_container.c
@@ -236,7 +236,6 @@ attribute_container_remove_device(struct device *dev,
 	}
 	up(&attribute_container_mutex);
 }
-EXPORT_SYMBOL_GPL(attribute_container_remove_device);
 
 /**
  * attribute_container_device_trigger - execute a trigger for each matching classdev
@@ -276,7 +275,6 @@ attribute_container_device_trigger(struct device *dev,
 	}
 	up(&attribute_container_mutex);
 }
-EXPORT_SYMBOL_GPL(attribute_container_device_trigger);
 
 /**
  * attribute_container_trigger - trigger a function for each matching container
@@ -304,7 +302,6 @@ attribute_container_trigger(struct device *dev,
 	}
 	up(&attribute_container_mutex);
 }
-EXPORT_SYMBOL_GPL(attribute_container_trigger);
 
 /**
  * attribute_container_add_attrs - add attributes
@@ -333,7 +330,6 @@ attribute_container_add_attrs(struct class_device *classdev)
 
 	return 0;
 }
-EXPORT_SYMBOL_GPL(attribute_container_add_attrs);
 
 /**
  * attribute_container_add_class_device - same function as class_device_add
@@ -352,7 +348,6 @@ attribute_container_add_class_device(struct class_device *classdev)
 		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
@@ -367,7 +362,6 @@ attribute_container_add_class_device_adapter(struct attribute_container *cont,
 {
 	return attribute_container_add_class_device(classdev);
 }
-EXPORT_SYMBOL_GPL(attribute_container_add_class_device_adapter);
 
 /**
  * attribute_container_remove_attrs - remove any attribute files
@@ -389,7 +383,6 @@ attribute_container_remove_attrs(struct class_device *classdev)
 	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
@@ -405,7 +398,6 @@ 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);
 
 /**
  * attribute_container_find_class_device - find the corresponding class_device
diff --git a/drivers/base/base.h b/drivers/base/base.h
index 5735b38582d0..c3b8dc98b8a7 100644
--- a/drivers/base/base.h
+++ b/drivers/base/base.h
@@ -5,13 +5,21 @@ extern int devices_init(void);
 extern int buses_init(void);
 extern int classes_init(void);
 extern int firmware_init(void);
+#ifdef CONFIG_SYS_HYPERVISOR
+extern int hypervisor_init(void);
+#else
+static inline int hypervisor_init(void) { return 0; }
+#endif
 extern int platform_bus_init(void);
 extern int system_bus_init(void);
 extern int cpu_dev_init(void);
 extern int attribute_container_init(void);
 
 extern int bus_add_device(struct device * dev);
+extern void bus_attach_device(struct device * dev);
 extern void bus_remove_device(struct device * dev);
+extern struct bus_type *get_bus(struct bus_type * bus);
+extern void put_bus(struct bus_type * bus);
 
 extern int bus_add_driver(struct device_driver *);
 extern void bus_remove_driver(struct device_driver *);
@@ -34,4 +42,5 @@ struct class_device_attribute *to_class_dev_attr(struct attribute *_attr)
 	return container_of(_attr, struct class_device_attribute, attr);
 }
 
+extern char *make_class_name(const char *name, struct kobject *kobj);
 
diff --git a/drivers/base/bus.c b/drivers/base/bus.c
index 76656acd00d4..050d86d0b872 100644
--- a/drivers/base/bus.c
+++ b/drivers/base/bus.c
@@ -362,8 +362,7 @@ static void device_remove_attrs(struct bus_type * bus, struct device * dev)
  *	@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.
+ *	- Create link to device's bus.
  */
 int bus_add_device(struct device * dev)
 {
@@ -372,11 +371,10 @@ int bus_add_device(struct device * dev)
 
 	if (bus) {
 		pr_debug("bus %s: add device %s\n", bus->name, dev->bus_id);
-		device_attach(dev);
-		klist_add_tail(&dev->knode_bus, &bus->klist_devices);
 		error = device_add_attrs(bus, dev);
 		if (!error) {
 			sysfs_create_link(&bus->devices.kobj, &dev->kobj, dev->bus_id);
+			sysfs_create_link(&dev->kobj, &dev->bus->subsys.kset.kobj, "subsystem");
 			sysfs_create_link(&dev->kobj, &dev->bus->subsys.kset.kobj, "bus");
 		}
 	}
@@ -384,6 +382,22 @@ int bus_add_device(struct device * dev)
 }
 
 /**
+ *	bus_attach_device - add device to bus
+ *	@dev:	device tried to attach to a driver
+ *
+ *	- Try to attach to driver.
+ */
+void bus_attach_device(struct device * dev)
+{
+	struct bus_type * bus = dev->bus;
+
+	if (bus) {
+		device_attach(dev);
+		klist_add_tail(&dev->knode_bus, &bus->klist_devices);
+	}
+}
+
+/**
  *	bus_remove_device - remove device from bus
  *	@dev:	device to be removed
  *
@@ -395,6 +409,7 @@ int bus_add_device(struct device * dev)
 void bus_remove_device(struct device * dev)
 {
 	if (dev->bus) {
+		sysfs_remove_link(&dev->kobj, "subsystem");
 		sysfs_remove_link(&dev->kobj, "bus");
 		sysfs_remove_link(&dev->bus->devices.kobj, dev->bus_id);
 		device_remove_attrs(dev->bus, dev);
@@ -732,14 +747,9 @@ EXPORT_SYMBOL_GPL(bus_for_each_dev);
 EXPORT_SYMBOL_GPL(bus_find_device);
 EXPORT_SYMBOL_GPL(bus_for_each_drv);
 
-EXPORT_SYMBOL_GPL(bus_add_device);
-EXPORT_SYMBOL_GPL(bus_remove_device);
 EXPORT_SYMBOL_GPL(bus_register);
 EXPORT_SYMBOL_GPL(bus_unregister);
 EXPORT_SYMBOL_GPL(bus_rescan_devices);
-EXPORT_SYMBOL_GPL(get_bus);
-EXPORT_SYMBOL_GPL(put_bus);
-EXPORT_SYMBOL_GPL(find_bus);
 
 EXPORT_SYMBOL_GPL(bus_create_file);
 EXPORT_SYMBOL_GPL(bus_remove_file);
diff --git a/drivers/base/class.c b/drivers/base/class.c
index b1ea4df85c7d..9aa127460262 100644
--- a/drivers/base/class.c
+++ b/drivers/base/class.c
@@ -91,14 +91,14 @@ void class_remove_file(struct class * cls, const struct class_attribute * attr)
 		sysfs_remove_file(&cls->subsys.kset.kobj, &attr->attr);
 }
 
-struct class * class_get(struct class * cls)
+static struct class *class_get(struct class *cls)
 {
 	if (cls)
 		return container_of(subsys_get(&cls->subsys), struct class, subsys);
 	return NULL;
 }
 
-void class_put(struct class * cls)
+static void class_put(struct class * cls)
 {
 	if (cls)
 		subsys_put(&cls->subsys);
@@ -142,6 +142,7 @@ int class_register(struct class * cls)
 	pr_debug("device class '%s': registering\n", cls->name);
 
 	INIT_LIST_HEAD(&cls->children);
+	INIT_LIST_HEAD(&cls->devices);
 	INIT_LIST_HEAD(&cls->interfaces);
 	init_MUTEX(&cls->sem);
 	error = kobject_set_name(&cls->subsys.kset.kobj, "%s", cls->name);
@@ -504,22 +505,21 @@ void class_device_initialize(struct class_device *class_dev)
 	INIT_LIST_HEAD(&class_dev->node);
 }
 
-static char *make_class_name(struct class_device *class_dev)
+char *make_class_name(const char *name, struct kobject *kobj)
 {
-	char *name;
+	char *class_name;
 	int size;
 
-	size = strlen(class_dev->class->name) +
-		strlen(kobject_name(&class_dev->kobj)) + 2;
+	size = strlen(name) + strlen(kobject_name(kobj)) + 2;
 
-	name = kmalloc(size, GFP_KERNEL);
-	if (!name)
+	class_name = kmalloc(size, GFP_KERNEL);
+	if (!class_name)
 		return ERR_PTR(-ENOMEM);
 
-	strcpy(name, class_dev->class->name);
-	strcat(name, ":");
-	strcat(name, kobject_name(&class_dev->kobj));
-	return name;
+	strcpy(class_name, name);
+	strcat(class_name, ":");
+	strcat(class_name, kobject_name(kobj));
+	return class_name;
 }
 
 int class_device_add(struct class_device *class_dev)
@@ -535,18 +535,22 @@ int class_device_add(struct class_device *class_dev)
 		return -EINVAL;
 
 	if (!strlen(class_dev->class_id))
-		goto register_done;
+		goto out1;
 
 	parent_class = class_get(class_dev->class);
 	if (!parent_class)
-		goto register_done;
+		goto out1;
+
 	parent_class_dev = class_device_get(class_dev->parent);
 
 	pr_debug("CLASS: registering class device: ID = '%s'\n",
 		 class_dev->class_id);
 
 	/* first, register with generic layer. */
-	kobject_set_name(&class_dev->kobj, "%s", class_dev->class_id);
+	error = kobject_set_name(&class_dev->kobj, "%s", class_dev->class_id);
+	if (error)
+		goto out2;
+
 	if (parent_class_dev)
 		class_dev->kobj.parent = &parent_class_dev->kobj;
 	else
@@ -554,41 +558,58 @@ int class_device_add(struct class_device *class_dev)
 
 	error = kobject_add(&class_dev->kobj);
 	if (error)
-		goto register_done;
+		goto out2;
 
 	/* add the needed attributes to this device */
+	sysfs_create_link(&class_dev->kobj, &parent_class->subsys.kset.kobj, "subsystem");
 	class_dev->uevent_attr.attr.name = "uevent";
 	class_dev->uevent_attr.attr.mode = S_IWUSR;
 	class_dev->uevent_attr.attr.owner = parent_class->owner;
 	class_dev->uevent_attr.store = store_uevent;
-	class_device_create_file(class_dev, &class_dev->uevent_attr);
+	error = class_device_create_file(class_dev, &class_dev->uevent_attr);
+	if (error)
+		goto out3;
 
 	if (MAJOR(class_dev->devt)) {
 		struct class_device_attribute *attr;
 		attr = kzalloc(sizeof(*attr), GFP_KERNEL);
 		if (!attr) {
 			error = -ENOMEM;
-			kobject_del(&class_dev->kobj);
-			goto register_done;
+			goto out4;
 		}
 		attr->attr.name = "dev";
 		attr->attr.mode = S_IRUGO;
 		attr->attr.owner = parent_class->owner;
 		attr->show = show_dev;
-		class_device_create_file(class_dev, attr);
+		error = class_device_create_file(class_dev, attr);
+		if (error) {
+			kfree(attr);
+			goto out4;
+		}
+
 		class_dev->devt_attr = attr;
 	}
 
-	class_device_add_attrs(class_dev);
+	error = class_device_add_attrs(class_dev);
+	if (error)
+		goto out5;
+
 	if (class_dev->dev) {
-		class_name = make_class_name(class_dev);
-		sysfs_create_link(&class_dev->kobj,
-				  &class_dev->dev->kobj, "device");
-		sysfs_create_link(&class_dev->dev->kobj, &class_dev->kobj,
-				  class_name);
+		class_name = make_class_name(class_dev->class->name,
+					     &class_dev->kobj);
+		error = sysfs_create_link(&class_dev->kobj,
+					  &class_dev->dev->kobj, "device");
+		if (error)
+			goto out6;
+		error = sysfs_create_link(&class_dev->dev->kobj, &class_dev->kobj,
+					  class_name);
+		if (error)
+			goto out7;
 	}
 
-	class_device_add_groups(class_dev);
+	error = class_device_add_groups(class_dev);
+	if (error)
+		goto out8;
 
 	kobject_uevent(&class_dev->kobj, KOBJ_ADD);
 
@@ -601,11 +622,28 @@ int class_device_add(struct class_device *class_dev)
 	}
 	up(&parent_class->sem);
 
- register_done:
-	if (error) {
-		class_put(parent_class);
+	goto out1;
+
+ out8:
+	if (class_dev->dev)
+		sysfs_remove_link(&class_dev->kobj, class_name);
+ out7:
+	if (class_dev->dev)
+		sysfs_remove_link(&class_dev->kobj, "device");
+ out6:
+	class_device_remove_attrs(class_dev);
+ out5:
+	if (class_dev->devt_attr)
+		class_device_remove_file(class_dev, class_dev->devt_attr);
+ out4:
+	class_device_remove_file(class_dev, &class_dev->uevent_attr);
+ out3:
+	kobject_del(&class_dev->kobj);
+ out2:
+	if(parent_class_dev)
 		class_device_put(parent_class_dev);
-	}
+	class_put(parent_class);
+ out1:
 	class_device_put(class_dev);
 	kfree(class_name);
 	return error;
@@ -695,10 +733,12 @@ void class_device_del(struct class_device *class_dev)
 	}
 
 	if (class_dev->dev) {
-		class_name = make_class_name(class_dev);
+		class_name = make_class_name(class_dev->class->name,
+					     &class_dev->kobj);
 		sysfs_remove_link(&class_dev->kobj, "device");
 		sysfs_remove_link(&class_dev->dev->kobj, class_name);
 	}
+	sysfs_remove_link(&class_dev->kobj, "subsystem");
 	class_device_remove_file(class_dev, &class_dev->uevent_attr);
 	if (class_dev->devt_attr)
 		class_device_remove_file(class_dev, class_dev->devt_attr);
@@ -760,14 +800,16 @@ int class_device_rename(struct class_device *class_dev, char *new_name)
 		 new_name);
 
 	if (class_dev->dev)
-		old_class_name = make_class_name(class_dev);
+		old_class_name = make_class_name(class_dev->class->name,
+						 &class_dev->kobj);
 
 	strlcpy(class_dev->class_id, new_name, KOBJ_NAME_LEN);
 
 	error = kobject_rename(&class_dev->kobj, new_name);
 
 	if (class_dev->dev) {
-		new_class_name = make_class_name(class_dev);
+		new_class_name = make_class_name(class_dev->class->name,
+						 &class_dev->kobj);
 		sysfs_create_link(&class_dev->dev->kobj, &class_dev->kobj,
 				  new_class_name);
 		sysfs_remove_link(&class_dev->dev->kobj, old_class_name);
@@ -858,8 +900,6 @@ EXPORT_SYMBOL_GPL(class_create_file);
 EXPORT_SYMBOL_GPL(class_remove_file);
 EXPORT_SYMBOL_GPL(class_register);
 EXPORT_SYMBOL_GPL(class_unregister);
-EXPORT_SYMBOL_GPL(class_get);
-EXPORT_SYMBOL_GPL(class_put);
 EXPORT_SYMBOL_GPL(class_create);
 EXPORT_SYMBOL_GPL(class_destroy);
 
diff --git a/drivers/base/core.c b/drivers/base/core.c
index 6b355bd7816d..27c2176895de 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -15,6 +15,7 @@
 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/string.h>
+#include <linux/kdev_t.h>
 
 #include <asm/semaphore.h>
 
@@ -28,6 +29,22 @@ int (*platform_notify_remove)(struct device * dev) = NULL;
  * sysfs bindings for devices.
  */
 
+/**
+ * dev_driver_string - Return a device's driver name, if at all possible
+ * @dev: struct device to get the name of
+ *
+ * Will return the device's driver's name if it is bound to a device.  If
+ * the device is not bound to a device, it will return the name of the bus
+ * it is attached to.  If it is not attached to a bus either, an empty
+ * string will be returned.
+ */
+const char *dev_driver_string(struct device *dev)
+{
+	return dev->driver ? dev->driver->name :
+			(dev->bus ? dev->bus->name : "");
+}
+EXPORT_SYMBOL_GPL(dev_driver_string);
+
 #define to_dev(obj) container_of(obj, struct device, kobj)
 #define to_dev_attr(_attr) container_of(_attr, struct device_attribute, attr)
 
@@ -98,6 +115,8 @@ static int dev_uevent_filter(struct kset *kset, struct kobject *kobj)
 		struct device *dev = to_dev(kobj);
 		if (dev->bus)
 			return 1;
+		if (dev->class)
+			return 1;
 	}
 	return 0;
 }
@@ -106,7 +125,11 @@ static const char *dev_uevent_name(struct kset *kset, struct kobject *kobj)
 {
 	struct device *dev = to_dev(kobj);
 
-	return dev->bus->name;
+	if (dev->bus)
+		return dev->bus->name;
+	if (dev->class)
+		return dev->class->name;
+	return NULL;
 }
 
 static int dev_uevent(struct kset *kset, struct kobject *kobj, char **envp,
@@ -117,6 +140,16 @@ static int dev_uevent(struct kset *kset, struct kobject *kobj, char **envp,
 	int length = 0;
 	int retval = 0;
 
+	/* add the major/minor if present */
+	if (MAJOR(dev->devt)) {
+		add_uevent_var(envp, num_envp, &i,
+			       buffer, buffer_size, &length,
+			       "MAJOR=%u", MAJOR(dev->devt));
+		add_uevent_var(envp, num_envp, &i,
+			       buffer, buffer_size, &length,
+			       "MINOR=%u", MINOR(dev->devt));
+	}
+
 	/* add bus name of physical device */
 	if (dev->bus)
 		add_uevent_var(envp, num_envp, &i,
@@ -161,6 +194,12 @@ static ssize_t store_uevent(struct device *dev, struct device_attribute *attr,
 	return count;
 }
 
+static ssize_t show_dev(struct device *dev, struct device_attribute *attr,
+			char *buf)
+{
+	return print_dev_t(buf, dev->devt);
+}
+
 /*
  *	devices_subsys - structure to be registered with kobject core.
  */
@@ -231,6 +270,7 @@ void device_initialize(struct device *dev)
 	klist_init(&dev->klist_children, klist_children_get,
 		   klist_children_put);
 	INIT_LIST_HEAD(&dev->dma_pools);
+	INIT_LIST_HEAD(&dev->node);
 	init_MUTEX(&dev->sem);
 	device_init_wakeup(dev, 0);
 }
@@ -249,6 +289,7 @@ void device_initialize(struct device *dev)
 int device_add(struct device *dev)
 {
 	struct device *parent = NULL;
+	char *class_name = NULL;
 	int error = -EINVAL;
 
 	dev = get_device(dev);
@@ -274,23 +315,69 @@ int device_add(struct device *dev)
 	dev->uevent_attr.store = store_uevent;
 	device_create_file(dev, &dev->uevent_attr);
 
-	kobject_uevent(&dev->kobj, KOBJ_ADD);
+	if (MAJOR(dev->devt)) {
+		struct device_attribute *attr;
+		attr = kzalloc(sizeof(*attr), GFP_KERNEL);
+		if (!attr) {
+			error = -ENOMEM;
+			goto PMError;
+		}
+		attr->attr.name = "dev";
+		attr->attr.mode = S_IRUGO;
+		if (dev->driver)
+			attr->attr.owner = dev->driver->owner;
+		attr->show = show_dev;
+		error = device_create_file(dev, attr);
+		if (error) {
+			kfree(attr);
+			goto attrError;
+		}
+
+		dev->devt_attr = attr;
+	}
+
+	if (dev->class) {
+		sysfs_create_link(&dev->kobj, &dev->class->subsys.kset.kobj,
+				  "subsystem");
+		sysfs_create_link(&dev->class->subsys.kset.kobj, &dev->kobj,
+				  dev->bus_id);
+
+		sysfs_create_link(&dev->kobj, &dev->parent->kobj, "device");
+		class_name = make_class_name(dev->class->name, &dev->kobj);
+		sysfs_create_link(&dev->parent->kobj, &dev->kobj, class_name);
+	}
+
 	if ((error = device_pm_add(dev)))
 		goto PMError;
 	if ((error = bus_add_device(dev)))
 		goto BusError;
+	kobject_uevent(&dev->kobj, KOBJ_ADD);
+	bus_attach_device(dev);
 	if (parent)
 		klist_add_tail(&dev->knode_parent, &parent->klist_children);
 
+	if (dev->class) {
+		/* tie the class to the device */
+		down(&dev->class->sem);
+		list_add_tail(&dev->node, &dev->class->devices);
+		up(&dev->class->sem);
+	}
+
 	/* notify platform of device entry */
 	if (platform_notify)
 		platform_notify(dev);
  Done:
+ 	kfree(class_name);
 	put_device(dev);
 	return error;
  BusError:
 	device_pm_remove(dev);
  PMError:
+	if (dev->devt_attr) {
+		device_remove_file(dev, dev->devt_attr);
+		kfree(dev->devt_attr);
+	}
+ attrError:
 	kobject_uevent(&dev->kobj, KOBJ_REMOVE);
 	kobject_del(&dev->kobj);
  Error:
@@ -362,9 +449,23 @@ void put_device(struct device * dev)
 void device_del(struct device * dev)
 {
 	struct device * parent = dev->parent;
+	char *class_name = NULL;
 
 	if (parent)
 		klist_del(&dev->knode_parent);
+	if (dev->devt_attr)
+		device_remove_file(dev, dev->devt_attr);
+	if (dev->class) {
+		sysfs_remove_link(&dev->kobj, "subsystem");
+		sysfs_remove_link(&dev->class->subsys.kset.kobj, dev->bus_id);
+		class_name = make_class_name(dev->class->name, &dev->kobj);
+		sysfs_remove_link(&dev->kobj, "device");
+		sysfs_remove_link(&dev->parent->kobj, class_name);
+		kfree(class_name);
+		down(&dev->class->sem);
+		list_del_init(&dev->node);
+		up(&dev->class->sem);
+	}
 	device_remove_file(dev, &dev->uevent_attr);
 
 	/* Notify the platform of the removal, in case they
@@ -449,3 +550,98 @@ EXPORT_SYMBOL_GPL(put_device);
 
 EXPORT_SYMBOL_GPL(device_create_file);
 EXPORT_SYMBOL_GPL(device_remove_file);
+
+
+static void device_create_release(struct device *dev)
+{
+	pr_debug("%s called for %s\n", __FUNCTION__, dev->bus_id);
+	kfree(dev);
+}
+
+/**
+ * device_create - creates a device and registers it with sysfs
+ * @cs: pointer to the struct class that this device should be registered to.
+ * @parent: pointer to the parent struct device of this new device, if any.
+ * @dev: the dev_t for the char device to be added.
+ * @fmt: string for the class device's name
+ *
+ * This function can be used by char device classes.  A struct
+ * device will be created in sysfs, registered to the specified
+ * class.
+ * A "dev" file will be created, showing the dev_t for the device, if
+ * the dev_t is not 0,0.
+ * If a pointer to a parent struct device is passed in, the newly
+ * created struct device will be a child of that device in sysfs.  The
+ * pointer to the struct device will be returned from the call.  Any
+ * further sysfs files that might be required can be created using this
+ * pointer.
+ *
+ * Note: the struct class passed to this function must have previously
+ * been created with a call to class_create().
+ */
+struct device *device_create(struct class *class, struct device *parent,
+			     dev_t devt, char *fmt, ...)
+{
+	va_list args;
+	struct device *dev = NULL;
+	int retval = -ENODEV;
+
+	if (class == NULL || IS_ERR(class))
+		goto error;
+	if (parent == NULL) {
+		printk(KERN_WARNING "%s does not work yet for NULL parents\n", __FUNCTION__);
+		goto error;
+	}
+
+	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+	if (!dev) {
+		retval = -ENOMEM;
+		goto error;
+	}
+
+	dev->devt = devt;
+	dev->class = class;
+	dev->parent = parent;
+	dev->release = device_create_release;
+
+	va_start(args, fmt);
+	vsnprintf(dev->bus_id, BUS_ID_SIZE, fmt, args);
+	va_end(args);
+	retval = device_register(dev);
+	if (retval)
+		goto error;
+
+	return dev;
+
+error:
+	kfree(dev);
+	return ERR_PTR(retval);
+}
+EXPORT_SYMBOL_GPL(device_create);
+
+/**
+ * device_destroy - removes a device that was created with device_create()
+ * @class: the pointer to the struct class that this device was registered * with.
+ * @dev: the dev_t of the device that was previously registered.
+ *
+ * This call unregisters and cleans up a class device that was created with a
+ * call to class_device_create()
+ */
+void device_destroy(struct class *class, dev_t devt)
+{
+	struct device *dev = NULL;
+	struct device *dev_tmp;
+
+	down(&class->sem);
+	list_for_each_entry(dev_tmp, &class->devices, node) {
+		if (dev_tmp->devt == devt) {
+			dev = dev_tmp;
+			break;
+		}
+	}
+	up(&class->sem);
+
+	if (dev)
+		device_unregister(dev);
+}
+EXPORT_SYMBOL_GPL(device_destroy);
diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c
index 0c99ae6a3407..5d6c011183f5 100644
--- a/drivers/base/firmware_class.c
+++ b/drivers/base/firmware_class.c
@@ -15,7 +15,7 @@
 #include <linux/vmalloc.h>
 #include <linux/interrupt.h>
 #include <linux/bitops.h>
-#include <asm/semaphore.h>
+#include <linux/mutex.h>
 
 #include <linux/firmware.h>
 #include "base.h"
@@ -36,7 +36,7 @@ static int loading_timeout = 10;	/* In seconds */
 
 /* fw_lock could be moved to 'struct firmware_priv' but since it is just
  * guarding for corner cases a global lock should be OK */
-static DECLARE_MUTEX(fw_lock);
+static DEFINE_MUTEX(fw_lock);
 
 struct firmware_priv {
 	char fw_id[FIRMWARE_NAME_MAX];
@@ -142,9 +142,9 @@ firmware_loading_store(struct class_device *class_dev,
 
 	switch (loading) {
 	case 1:
-		down(&fw_lock);
+		mutex_lock(&fw_lock);
 		if (!fw_priv->fw) {
-			up(&fw_lock);
+			mutex_unlock(&fw_lock);
 			break;
 		}
 		vfree(fw_priv->fw->data);
@@ -152,7 +152,7 @@ firmware_loading_store(struct class_device *class_dev,
 		fw_priv->fw->size = 0;
 		fw_priv->alloc_size = 0;
 		set_bit(FW_STATUS_LOADING, &fw_priv->status);
-		up(&fw_lock);
+		mutex_unlock(&fw_lock);
 		break;
 	case 0:
 		if (test_bit(FW_STATUS_LOADING, &fw_priv->status)) {
@@ -185,7 +185,7 @@ firmware_data_read(struct kobject *kobj,
 	struct firmware *fw;
 	ssize_t ret_count = count;
 
-	down(&fw_lock);
+	mutex_lock(&fw_lock);
 	fw = fw_priv->fw;
 	if (!fw || test_bit(FW_STATUS_DONE, &fw_priv->status)) {
 		ret_count = -ENODEV;
@@ -200,7 +200,7 @@ firmware_data_read(struct kobject *kobj,
 
 	memcpy(buffer, fw->data + offset, ret_count);
 out:
-	up(&fw_lock);
+	mutex_unlock(&fw_lock);
 	return ret_count;
 }
 
@@ -253,7 +253,7 @@ firmware_data_write(struct kobject *kobj,
 	if (!capable(CAP_SYS_RAWIO))
 		return -EPERM;
 
-	down(&fw_lock);
+	mutex_lock(&fw_lock);
 	fw = fw_priv->fw;
 	if (!fw || test_bit(FW_STATUS_DONE, &fw_priv->status)) {
 		retval = -ENODEV;
@@ -268,7 +268,7 @@ firmware_data_write(struct kobject *kobj,
 	fw->size = max_t(size_t, offset + count, fw->size);
 	retval = count;
 out:
-	up(&fw_lock);
+	mutex_unlock(&fw_lock);
 	return retval;
 }
 
@@ -436,14 +436,14 @@ _request_firmware(const struct firmware **firmware_p, const char *name,
 	} else
 		wait_for_completion(&fw_priv->completion);
 
-	down(&fw_lock);
+	mutex_lock(&fw_lock);
 	if (!fw_priv->fw->size || test_bit(FW_STATUS_ABORT, &fw_priv->status)) {
 		retval = -ENOENT;
 		release_firmware(fw_priv->fw);
 		*firmware_p = NULL;
 	}
 	fw_priv->fw = NULL;
-	up(&fw_lock);
+	mutex_unlock(&fw_lock);
 	class_device_unregister(class_dev);
 	goto out;
 
diff --git a/drivers/base/hypervisor.c b/drivers/base/hypervisor.c
new file mode 100644
index 000000000000..0c85e9d6a448
--- /dev/null
+++ b/drivers/base/hypervisor.c
@@ -0,0 +1,19 @@
+/*
+ * hypervisor.c - /sys/hypervisor subsystem.
+ *
+ * This file is released under the GPLv2
+ *
+ */
+
+#include <linux/kobject.h>
+#include <linux/device.h>
+
+#include "base.h"
+
+decl_subsys(hypervisor, NULL, NULL);
+EXPORT_SYMBOL_GPL(hypervisor_subsys);
+
+int __init hypervisor_init(void)
+{
+	return subsystem_register(&hypervisor_subsys);
+}
diff --git a/drivers/base/init.c b/drivers/base/init.c
index c648914b9cde..37138154f9e8 100644
--- a/drivers/base/init.c
+++ b/drivers/base/init.c
@@ -27,6 +27,7 @@ void __init driver_init(void)
 	buses_init();
 	classes_init();
 	firmware_init();
+	hypervisor_init();
 
 	/* These are also core pieces, but must come after the
 	 * core core pieces.
diff --git a/drivers/base/isa.c b/drivers/base/isa.c
new file mode 100644
index 000000000000..d2222397a401
--- /dev/null
+++ b/drivers/base/isa.c
@@ -0,0 +1,180 @@
+/*
+ * ISA bus.
+ */
+
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/isa.h>
+
+static struct device isa_bus = {
+	.bus_id		= "isa"
+};
+
+struct isa_dev {
+	struct device dev;
+	struct device *next;
+	unsigned int id;
+};
+
+#define to_isa_dev(x) container_of((x), struct isa_dev, dev)
+
+static int isa_bus_match(struct device *dev, struct device_driver *driver)
+{
+	struct isa_driver *isa_driver = to_isa_driver(driver);
+
+	if (dev->platform_data == isa_driver) {
+		if (!isa_driver->match ||
+			isa_driver->match(dev, to_isa_dev(dev)->id))
+			return 1;
+		dev->platform_data = NULL;
+	}
+	return 0;
+}
+
+static int isa_bus_probe(struct device *dev)
+{
+	struct isa_driver *isa_driver = dev->platform_data;
+
+	if (isa_driver->probe)
+		return isa_driver->probe(dev, to_isa_dev(dev)->id);
+
+	return 0;
+}
+
+static int isa_bus_remove(struct device *dev)
+{
+	struct isa_driver *isa_driver = dev->platform_data;
+
+	if (isa_driver->remove)
+		return isa_driver->remove(dev, to_isa_dev(dev)->id);
+
+	return 0;
+}
+
+static void isa_bus_shutdown(struct device *dev)
+{
+	struct isa_driver *isa_driver = dev->platform_data;
+
+	if (isa_driver->shutdown)
+		isa_driver->shutdown(dev, to_isa_dev(dev)->id);
+}
+
+static int isa_bus_suspend(struct device *dev, pm_message_t state)
+{
+	struct isa_driver *isa_driver = dev->platform_data;
+
+	if (isa_driver->suspend)
+		return isa_driver->suspend(dev, to_isa_dev(dev)->id, state);
+
+	return 0;
+}
+
+static int isa_bus_resume(struct device *dev)
+{
+	struct isa_driver *isa_driver = dev->platform_data;
+
+	if (isa_driver->resume)
+		return isa_driver->resume(dev, to_isa_dev(dev)->id);
+
+	return 0;
+}
+
+static struct bus_type isa_bus_type = {
+	.name		= "isa",
+	.match		= isa_bus_match,
+	.probe		= isa_bus_probe,
+	.remove		= isa_bus_remove,
+	.shutdown	= isa_bus_shutdown,
+	.suspend	= isa_bus_suspend,
+	.resume		= isa_bus_resume
+};
+
+static void isa_dev_release(struct device *dev)
+{
+	kfree(to_isa_dev(dev));
+}
+
+void isa_unregister_driver(struct isa_driver *isa_driver)
+{
+	struct device *dev = isa_driver->devices;
+
+	while (dev) {
+		struct device *tmp = to_isa_dev(dev)->next;
+		device_unregister(dev);
+		dev = tmp;
+	}
+	driver_unregister(&isa_driver->driver);
+}
+EXPORT_SYMBOL_GPL(isa_unregister_driver);
+
+int isa_register_driver(struct isa_driver *isa_driver, unsigned int ndev)
+{
+	int error;
+	unsigned int id;
+
+	isa_driver->driver.bus	= &isa_bus_type;
+	isa_driver->devices	= NULL;
+
+	error = driver_register(&isa_driver->driver);
+	if (error)
+		return error;
+
+	for (id = 0; id < ndev; id++) {
+		struct isa_dev *isa_dev;
+
+		isa_dev = kzalloc(sizeof *isa_dev, GFP_KERNEL);
+		if (!isa_dev) {
+			error = -ENOMEM;
+			break;
+		}
+
+		isa_dev->dev.parent	= &isa_bus;
+		isa_dev->dev.bus	= &isa_bus_type;
+
+		snprintf(isa_dev->dev.bus_id, BUS_ID_SIZE, "%s.%u",
+				isa_driver->driver.name, id);
+
+		isa_dev->dev.platform_data	= isa_driver;
+		isa_dev->dev.release		= isa_dev_release;
+		isa_dev->id			= id;
+
+		error = device_register(&isa_dev->dev);
+		if (error) {
+			put_device(&isa_dev->dev);
+			break;
+		}
+
+		if (isa_dev->dev.platform_data) {
+			isa_dev->next = isa_driver->devices;
+			isa_driver->devices = &isa_dev->dev;
+		} else
+			device_unregister(&isa_dev->dev);
+	}
+
+	if (!error && !isa_driver->devices)
+		error = -ENODEV;
+
+	if (error)
+		isa_unregister_driver(isa_driver);
+
+	return error;
+}
+EXPORT_SYMBOL_GPL(isa_register_driver);
+
+static int __init isa_bus_init(void)
+{
+	int error;
+
+	error = bus_register(&isa_bus_type);
+	if (!error) {
+		error = device_register(&isa_bus);
+		if (error)
+			bus_unregister(&isa_bus_type);
+	}
+	return error;
+}
+
+device_initcall(isa_bus_init);
diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 83f5c5984d1a..2b8755db76c6 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -275,7 +275,7 @@ int platform_device_add(struct platform_device *pdev)
 	pr_debug("Registering platform device '%s'. Parent at %s\n",
 		 pdev->dev.bus_id, pdev->dev.parent->bus_id);
 
-	ret = device_register(&pdev->dev);
+	ret = device_add(&pdev->dev);
 	if (ret == 0)
 		return ret;
 
@@ -452,6 +452,37 @@ void platform_driver_unregister(struct platform_driver *drv)
 EXPORT_SYMBOL_GPL(platform_driver_unregister);
 
 
+/* modalias support enables more hands-off userspace setup:
+ * (a) environment variable lets new-style hotplug events work once system is
+ *     fully running:  "modprobe $MODALIAS"
+ * (b) sysfs attribute lets new-style coldplug recover from hotplug events
+ *     mishandled before system is fully running:  "modprobe $(cat modalias)"
+ */
+static ssize_t
+modalias_show(struct device *dev, struct device_attribute *a, char *buf)
+{
+	struct platform_device	*pdev = to_platform_device(dev);
+	int len = snprintf(buf, PAGE_SIZE, "%s\n", pdev->name);
+
+	return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
+}
+
+static struct device_attribute platform_dev_attrs[] = {
+	__ATTR_RO(modalias),
+	__ATTR_NULL,
+};
+
+static int platform_uevent(struct device *dev, char **envp, int num_envp,
+		char *buffer, int buffer_size)
+{
+	struct platform_device	*pdev = to_platform_device(dev);
+
+	envp[0] = buffer;
+	snprintf(buffer, buffer_size, "MODALIAS=%s", pdev->name);
+	return 0;
+}
+
+
 /**
  *	platform_match - bind platform device to platform driver.
  *	@dev:	device.
@@ -496,7 +527,9 @@ static int platform_resume(struct device * dev)
 
 struct bus_type platform_bus_type = {
 	.name		= "platform",
+	.dev_attrs	= platform_dev_attrs,
 	.match		= platform_match,
+	.uevent		= platform_uevent,
 	.suspend	= platform_suspend,
 	.resume		= platform_resume,
 };
diff --git a/drivers/base/power/Makefile b/drivers/base/power/Makefile
index c0219ad94aca..91f230939c1e 100644
--- a/drivers/base/power/Makefile
+++ b/drivers/base/power/Makefile
@@ -1,6 +1,10 @@
 obj-y			:= shutdown.o
 obj-$(CONFIG_PM)	+= main.o suspend.o resume.o runtime.o sysfs.o
+obj-$(CONFIG_PM_TRACE)	+= trace.o
 
 ifeq ($(CONFIG_DEBUG_DRIVER),y)
 EXTRA_CFLAGS += -DDEBUG
 endif
+ifeq ($(CONFIG_PM_DEBUG),y)
+EXTRA_CFLAGS += -DDEBUG
+endif
diff --git a/drivers/base/power/resume.c b/drivers/base/power/resume.c
index 317edbf0feca..520679ce53a8 100644
--- a/drivers/base/power/resume.c
+++ b/drivers/base/power/resume.c
@@ -9,6 +9,7 @@
  */
 
 #include <linux/device.h>
+#include <linux/resume-trace.h>
 #include "../base.h"
 #include "power.h"
 
@@ -23,6 +24,8 @@ int resume_device(struct device * dev)
 {
 	int error = 0;
 
+	TRACE_DEVICE(dev);
+	TRACE_RESUME(0);
 	down(&dev->sem);
 	if (dev->power.pm_parent
 			&& dev->power.pm_parent->power.power_state.event) {
@@ -36,6 +39,7 @@ int resume_device(struct device * dev)
 		error = dev->bus->resume(dev);
 	}
 	up(&dev->sem);
+	TRACE_RESUME(error);
 	return error;
 }
 
diff --git a/drivers/base/power/suspend.c b/drivers/base/power/suspend.c
index 662209d3f42d..1a1fe43a3057 100644
--- a/drivers/base/power/suspend.c
+++ b/drivers/base/power/suspend.c
@@ -8,7 +8,6 @@
  *
  */
 
-#include <linux/vt_kern.h>
 #include <linux/device.h>
 #include <linux/kallsyms.h>
 #include <linux/pm.h>
@@ -30,6 +29,15 @@
  * lists. This way, the ancestors will be accessed before their descendents.
  */
 
+static inline char *suspend_verb(u32 event)
+{
+	switch (event) {
+	case PM_EVENT_SUSPEND:	return "suspend";
+	case PM_EVENT_FREEZE:	return "freeze";
+	default:		return "(unknown suspend event)";
+	}
+}
+
 
 /**
  *	suspend_device - Save state of one device.
@@ -58,7 +66,13 @@ int suspend_device(struct device * dev, pm_message_t state)
 	dev->power.prev_state = dev->power.power_state;
 
 	if (dev->bus && dev->bus->suspend && !dev->power.power_state.event) {
-		dev_dbg(dev, "suspending\n");
+		dev_dbg(dev, "%s%s\n",
+			suspend_verb(state.event),
+			((state.event == PM_EVENT_SUSPEND)
+					&& device_may_wakeup(dev))
+				? ", may wakeup"
+				: ""
+			);
 		error = dev->bus->suspend(dev, state);
 		suspend_report_result(dev->bus->suspend, error);
 	}
@@ -66,6 +80,7 @@ int suspend_device(struct device * dev, pm_message_t state)
 	return error;
 }
 
+
 /**
  *	device_suspend - Save state and stop all devices in system.
  *	@state:		Power state to put each device in.
@@ -85,9 +100,6 @@ int device_suspend(pm_message_t state)
 {
 	int error = 0;
 
-	if (!is_console_suspend_safe())
-		return -EINVAL;
-
 	down(&dpm_sem);
 	down(&dpm_list_sem);
 	while (!list_empty(&dpm_active) && error == 0) {
diff --git a/drivers/base/power/trace.c b/drivers/base/power/trace.c
new file mode 100644
index 000000000000..a9ab30fefffc
--- /dev/null
+++ b/drivers/base/power/trace.c
@@ -0,0 +1,228 @@
+/*
+ * drivers/base/power/trace.c
+ *
+ * Copyright (C) 2006 Linus Torvalds
+ *
+ * Trace facility for suspend/resume problems, when none of the
+ * devices may be working.
+ */
+
+#include <linux/resume-trace.h>
+#include <linux/rtc.h>
+
+#include <asm/rtc.h>
+
+#include "power.h"
+
+/*
+ * Horrid, horrid, horrid.
+ *
+ * It turns out that the _only_ piece of hardware that actually
+ * keeps its value across a hard boot (and, more importantly, the
+ * POST init sequence) is literally the realtime clock.
+ *
+ * Never mind that an RTC chip has 114 bytes (and often a whole
+ * other bank of an additional 128 bytes) of nice SRAM that is
+ * _designed_ to keep data - the POST will clear it. So we literally
+ * can just use the few bytes of actual time data, which means that
+ * we're really limited.
+ *
+ * It means, for example, that we can't use the seconds at all
+ * (since the time between the hang and the boot might be more
+ * than a minute), and we'd better not depend on the low bits of
+ * the minutes either.
+ *
+ * There are the wday fields etc, but I wouldn't guarantee those
+ * are dependable either. And if the date isn't valid, either the
+ * hw or POST will do strange things.
+ *
+ * So we're left with:
+ *  - year: 0-99
+ *  - month: 0-11
+ *  - day-of-month: 1-28
+ *  - hour: 0-23
+ *  - min: (0-30)*2
+ *
+ * Giving us a total range of 0-16128000 (0xf61800), ie less
+ * than 24 bits of actual data we can save across reboots.
+ *
+ * And if your box can't boot in less than three minutes,
+ * you're screwed.
+ *
+ * Now, almost 24 bits of data is pitifully small, so we need
+ * to be pretty dense if we want to use it for anything nice.
+ * What we do is that instead of saving off nice readable info,
+ * we save off _hashes_ of information that we can hopefully
+ * regenerate after the reboot.
+ *
+ * In particular, this means that we might be unlucky, and hit
+ * a case where we have a hash collision, and we end up not
+ * being able to tell for certain exactly which case happened.
+ * But that's hopefully unlikely.
+ *
+ * What we do is to take the bits we can fit, and split them
+ * into three parts (16*997*1009 = 16095568), and use the values
+ * for:
+ *  - 0-15: user-settable
+ *  - 0-996: file + line number
+ *  - 0-1008: device
+ */
+#define USERHASH (16)
+#define FILEHASH (997)
+#define DEVHASH (1009)
+
+#define DEVSEED (7919)
+
+static unsigned int dev_hash_value;
+
+static int set_magic_time(unsigned int user, unsigned int file, unsigned int device)
+{
+	unsigned int n = user + USERHASH*(file + FILEHASH*device);
+
+	// June 7th, 2006
+	static struct rtc_time time = {
+		.tm_sec = 0,
+		.tm_min = 0,
+		.tm_hour = 0,
+		.tm_mday = 7,
+		.tm_mon = 5,	// June - counting from zero
+		.tm_year = 106,
+		.tm_wday = 3,
+		.tm_yday = 160,
+		.tm_isdst = 1
+	};
+
+	time.tm_year = (n % 100);
+	n /= 100;
+	time.tm_mon = (n % 12);
+	n /= 12;
+	time.tm_mday = (n % 28) + 1;
+	n /= 28;
+	time.tm_hour = (n % 24);
+	n /= 24;
+	time.tm_min = (n % 20) * 3;
+	n /= 20;
+	set_rtc_time(&time);
+	return n ? -1 : 0;
+}
+
+static unsigned int read_magic_time(void)
+{
+	struct rtc_time time;
+	unsigned int val;
+
+	get_rtc_time(&time);
+	printk("Time: %2d:%02d:%02d  Date: %02d/%02d/%02d\n",
+		time.tm_hour, time.tm_min, time.tm_sec,
+		time.tm_mon, time.tm_mday, time.tm_year);
+	val = time.tm_year;				/* 100 years */
+	if (val > 100)
+		val -= 100;
+	val += time.tm_mon * 100;			/* 12 months */
+	val += (time.tm_mday-1) * 100 * 12;		/* 28 month-days */
+	val += time.tm_hour * 100 * 12 * 28;		/* 24 hours */
+	val += (time.tm_min / 3) * 100 * 12 * 28 * 24;	/* 20 3-minute intervals */
+	return val;
+}
+
+/*
+ * This is just the sdbm hash function with a user-supplied
+ * seed and final size parameter.
+ */
+static unsigned int hash_string(unsigned int seed, const char *data, unsigned int mod)
+{
+	unsigned char c;
+	while ((c = *data++) != 0) {
+		seed = (seed << 16) + (seed << 6) - seed + c;
+	}
+	return seed % mod;
+}
+
+void set_trace_device(struct device *dev)
+{
+	dev_hash_value = hash_string(DEVSEED, dev->bus_id, DEVHASH);
+}
+
+/*
+ * We could just take the "tracedata" index into the .tracedata
+ * section instead. Generating a hash of the data gives us a
+ * chance to work across kernel versions, and perhaps more
+ * importantly it also gives us valid/invalid check (ie we will
+ * likely not give totally bogus reports - if the hash matches,
+ * it's not any guarantee, but it's a high _likelihood_ that
+ * the match is valid).
+ */
+void generate_resume_trace(void *tracedata, unsigned int user)
+{
+	unsigned short lineno = *(unsigned short *)tracedata;
+	const char *file = *(const char **)(tracedata + 2);
+	unsigned int user_hash_value, file_hash_value;
+
+	user_hash_value = user % USERHASH;
+	file_hash_value = hash_string(lineno, file, FILEHASH);
+	set_magic_time(user_hash_value, file_hash_value, dev_hash_value);
+}
+
+extern char __tracedata_start, __tracedata_end;
+static int show_file_hash(unsigned int value)
+{
+	int match;
+	char *tracedata;
+
+	match = 0;
+	for (tracedata = &__tracedata_start ; tracedata < &__tracedata_end ; tracedata += 6) {
+		unsigned short lineno = *(unsigned short *)tracedata;
+		const char *file = *(const char **)(tracedata + 2);
+		unsigned int hash = hash_string(lineno, file, FILEHASH);
+		if (hash != value)
+			continue;
+		printk("  hash matches %s:%u\n", file, lineno);
+		match++;
+	}
+	return match;
+}
+
+static int show_dev_hash(unsigned int value)
+{
+	int match = 0;
+	struct list_head * entry = dpm_active.prev;
+
+	while (entry != &dpm_active) {
+		struct device * dev = to_device(entry);
+		unsigned int hash = hash_string(DEVSEED, dev->bus_id, DEVHASH);
+		if (hash == value) {
+			printk("  hash matches device %s\n", dev->bus_id);
+			match++;
+		}
+		entry = entry->prev;
+	}
+	return match;
+}
+
+static unsigned int hash_value_early_read;
+
+static int early_resume_init(void)
+{
+	hash_value_early_read = read_magic_time();
+	return 0;
+}
+
+static int late_resume_init(void)
+{
+	unsigned int val = hash_value_early_read;
+	unsigned int user, file, dev;
+
+	user = val % USERHASH;
+	val = val / USERHASH;
+	file = val % FILEHASH;
+	val = val / FILEHASH;
+	dev = val /* % DEVHASH */;
+
+	printk("  Magic number: %d:%d:%d\n", user, file, dev);
+	show_file_hash(file);
+	show_dev_hash(dev);
+	return 0;
+}
+
+core_initcall(early_resume_init);
+late_initcall(late_resume_init);
diff --git a/drivers/base/sys.c b/drivers/base/sys.c
index 6fc23ab127bd..6858178b3aff 100644
--- a/drivers/base/sys.c
+++ b/drivers/base/sys.c
@@ -80,10 +80,59 @@ void sysdev_remove_file(struct sys_device * s, struct sysdev_attribute * a)
 EXPORT_SYMBOL_GPL(sysdev_create_file);
 EXPORT_SYMBOL_GPL(sysdev_remove_file);
 
+#define to_sysdev_class(k) container_of(k, struct sysdev_class, kset.kobj)
+#define to_sysdev_class_attr(a) container_of(a, \
+	struct sysdev_class_attribute, attr)
+
+static ssize_t sysdev_class_show(struct kobject *kobj, struct attribute *attr,
+				 char *buffer)
+{
+	struct sysdev_class * class = to_sysdev_class(kobj);
+	struct sysdev_class_attribute *class_attr = to_sysdev_class_attr(attr);
+
+	if (class_attr->show)
+		return class_attr->show(class, buffer);
+	return -EIO;
+}
+
+static ssize_t sysdev_class_store(struct kobject *kobj, struct attribute *attr,
+				  const char *buffer, size_t count)
+{
+	struct sysdev_class * class = to_sysdev_class(kobj);
+	struct sysdev_class_attribute * class_attr = to_sysdev_class_attr(attr);
+
+	if (class_attr->store)
+		return class_attr->store(class, buffer, count);
+	return -EIO;
+}
+
+static struct sysfs_ops sysfs_class_ops = {
+	.show	= sysdev_class_show,
+	.store	= sysdev_class_store,
+};
+
+static struct kobj_type ktype_sysdev_class = {
+	.sysfs_ops	= &sysfs_class_ops,
+};
+
+int sysdev_class_create_file(struct sysdev_class *c,
+			     struct sysdev_class_attribute *a)
+{
+	return sysfs_create_file(&c->kset.kobj, &a->attr);
+}
+EXPORT_SYMBOL_GPL(sysdev_class_create_file);
+
+void sysdev_class_remove_file(struct sysdev_class *c,
+			      struct sysdev_class_attribute *a)
+{
+	sysfs_remove_file(&c->kset.kobj, &a->attr);
+}
+EXPORT_SYMBOL_GPL(sysdev_class_remove_file);
+
 /*
  * declare system_subsys
  */
-static decl_subsys(system, &ktype_sysdev, NULL);
+static decl_subsys(system, &ktype_sysdev_class, NULL);
 
 int sysdev_class_register(struct sysdev_class * cls)
 {