driver core: remove no longer used "struct class_device" (c3b19ff0) · Commits · e / devices / android_kernel_samsung_universal8895

drivers/base/base.h

+0 −11

Original line number	Diff line number	Diff line
		@@ -64,17 +64,6 @@ extern void sysdev_shutdown(void);
		extern int sysdev_suspend(pm_message_t state);
		extern int sysdev_resume(void);

		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);
		}

		extern char make_class_name(const char name, struct kobject *kobj);

		extern int devres_release_all(struct device *dev);

drivers/base/class.c

+1 −637

Original line number	Diff line number	Diff line
		@@ -179,27 +179,13 @@ static void class_create_release(struct class *cls)
		kfree(cls);
		}

		static void class_device_create_release(struct class_device *class_dev)
		{
		pr_debug("%s called for %s\n", __func__, class_dev->class_id);
		kfree(class_dev);
		}

		/* needed to allow these devices to have parent class devices */
		static int class_device_create_uevent(struct class_device *class_dev,
		struct kobj_uevent_env *env)
		{
		pr_debug("%s called for %s\n", __func__, class_dev->class_id);
		return 0;
		}

		/**
		* class_create - create a struct class structure
		* @owner: pointer to the module that is to "own" this struct class
		* @name: pointer to a string for the name of this class.
		*
		* This is used to create a struct class pointer that can then be used
		* in calls to class_device_create().
		* in calls to device_create().
		*
		* Note, the pointer created here is to be destroyed when finished by
		* making a call to class_destroy().
		@@ -218,7 +204,6 @@ struct class class_create(struct module owner, const char *name)
		cls->name = name;
		cls->owner = owner;
		cls->class_release = class_create_release;
		cls->release = class_device_create_release;

		retval = class_register(cls);
		if (retval)
		@@ -246,113 +231,6 @@ void class_destroy(struct class *cls)
		class_unregister(cls);
		}

		/* Class Device Stuff */

		int class_device_create_file(struct class_device *class_dev,
		const struct class_device_attribute *attr)
		{
		int error = -EINVAL;
		if (class_dev)
		error = sysfs_create_file(&class_dev->kobj, &attr->attr);
		return error;
		}

		void class_device_remove_file(struct class_device *class_dev,
		const struct class_device_attribute *attr)
		{
		if (class_dev)
		sysfs_remove_file(&class_dev->kobj, &attr->attr);
		}

		int class_device_create_bin_file(struct class_device *class_dev,
		struct bin_attribute *attr)
		{
		int error = -EINVAL;
		if (class_dev)
		error = sysfs_create_bin_file(&class_dev->kobj, attr);
		return error;
		}

		void class_device_remove_bin_file(struct class_device *class_dev,
		struct bin_attribute *attr)
		{
		if (class_dev)
		sysfs_remove_bin_file(&class_dev->kobj, attr);
		}

		static ssize_t class_device_attr_show(struct kobject *kobj,
		struct attribute attr, char buf)
		{
		struct class_device_attribute *class_dev_attr = to_class_dev_attr(attr);
		struct class_device *cd = to_class_dev(kobj);
		ssize_t ret = 0;

		if (class_dev_attr->show)
		ret = class_dev_attr->show(cd, buf);
		return ret;
		}

		static ssize_t class_device_attr_store(struct kobject *kobj,
		struct attribute *attr,
		const char *buf, size_t count)
		{
		struct class_device_attribute *class_dev_attr = to_class_dev_attr(attr);
		struct class_device *cd = to_class_dev(kobj);
		ssize_t ret = 0;

		if (class_dev_attr->store)
		ret = class_dev_attr->store(cd, buf, count);
		return ret;
		}

		static struct sysfs_ops class_dev_sysfs_ops = {
		.show = class_device_attr_show,
		.store = class_device_attr_store,
		};

		static void class_dev_release(struct kobject *kobj)
		{
		struct class_device *cd = to_class_dev(kobj);
		struct class *cls = cd->class;

		pr_debug("device class '%s': release.\n", cd->class_id);

		if (cd->release)
		cd->release(cd);
		else if (cls->release)
		cls->release(cd);
		else {
		printk(KERN_ERR "Class Device '%s' does not have a release() "
		"function, it is broken and must be fixed.\n",
		cd->class_id);
		WARN_ON(1);
		}
		}

		static struct kobj_type class_device_ktype = {
		.sysfs_ops = &class_dev_sysfs_ops,
		.release = class_dev_release,
		};

		static int class_uevent_filter(struct kset kset, struct kobject kobj)
		{
		struct kobj_type *ktype = get_ktype(kobj);

		if (ktype == &class_device_ktype) {
		struct class_device *class_dev = to_class_dev(kobj);
		if (class_dev->class)
		return 1;
		}
		return 0;
		}

		static const char class_uevent_name(struct kset kset, struct kobject *kobj)
		{
		struct class_device *class_dev = to_class_dev(kobj);

		return class_dev->class->name;
		}

		#ifdef CONFIG_SYSFS_DEPRECATED
		char make_class_name(const char name, struct kobject *kobj)
		{
		@@ -370,445 +248,8 @@ char make_class_name(const char name, struct kobject *kobj)
		strcat(class_name, kobject_name(kobj));
		return class_name;
		}

		static int make_deprecated_class_device_links(struct class_device *class_dev)
		{
		char *class_name;
		int error;

		if (!class_dev->dev)
		return 0;

		class_name = make_class_name(class_dev->class->name, &class_dev->kobj);
		if (class_name)
		error = sysfs_create_link(&class_dev->dev->kobj,
		&class_dev->kobj, class_name);
		else
		error = -ENOMEM;
		kfree(class_name);
		return error;
		}

		static void remove_deprecated_class_device_links(struct class_device *class_dev)
		{
		char *class_name;

		if (!class_dev->dev)
		return;

		class_name = make_class_name(class_dev->class->name, &class_dev->kobj);
		if (class_name)
		sysfs_remove_link(&class_dev->dev->kobj, class_name);
		kfree(class_name);
		}
		#else
		static inline int make_deprecated_class_device_links(struct class_device *cd)
		{ return 0; }
		static void remove_deprecated_class_device_links(struct class_device *cd)
		{ }
		#endif

		static int class_uevent(struct kset kset, struct kobject kobj,
		struct kobj_uevent_env *env)
		{
		struct class_device *class_dev = to_class_dev(kobj);
		struct device *dev = class_dev->dev;
		int retval = 0;

		pr_debug("%s - name = %s\n", __func__, class_dev->class_id);

		if (MAJOR(class_dev->devt)) {
		add_uevent_var(env, "MAJOR=%u", MAJOR(class_dev->devt));

		add_uevent_var(env, "MINOR=%u", MINOR(class_dev->devt));
		}

		if (dev) {
		const char *path = kobject_get_path(&dev->kobj, GFP_KERNEL);
		if (path) {
		add_uevent_var(env, "PHYSDEVPATH=%s", path);
		kfree(path);
		}

		if (dev->bus)
		add_uevent_var(env, "PHYSDEVBUS=%s", dev->bus->name);

		if (dev->driver)
		add_uevent_var(env, "PHYSDEVDRIVER=%s",
		dev->driver->name);
		}

		if (class_dev->uevent) {
		/* have the class device specific function add its stuff */
		retval = class_dev->uevent(class_dev, env);
		if (retval)
		pr_debug("class_dev->uevent() returned %d\n", retval);
		} else if (class_dev->class->uevent) {
		/* have the class specific function add its stuff */
		retval = class_dev->class->uevent(class_dev, env);
		if (retval)
		pr_debug("class->uevent() returned %d\n", retval);
		}

		return retval;
		}

		static struct kset_uevent_ops class_uevent_ops = {
		.filter = class_uevent_filter,
		.name = class_uevent_name,
		.uevent = class_uevent,
		};

		/*
		* DO NOT copy how this is created, kset_create_and_add() should be
		* called, but this is a hold-over from the old-way and will be deleted
		* entirely soon.
		*/
		static struct kset class_obj_subsys = {
		.uevent_ops = &class_uevent_ops,
		};

		static int class_device_add_attrs(struct class_device *cd)
		{
		int i;
		int error = 0;
		struct class *cls = cd->class;

		if (cls->class_dev_attrs) {
		for (i = 0; attr_name(cls->class_dev_attrs[i]); i++) {
		error = class_device_create_file(cd,
		&cls->class_dev_attrs[i]);
		if (error)
		goto err;
		}
		}
		done:
		return error;
		err:
		while (--i >= 0)
		class_device_remove_file(cd, &cls->class_dev_attrs[i]);
		goto done;
		}

		static void class_device_remove_attrs(struct class_device *cd)
		{
		int i;
		struct class *cls = cd->class;

		if (cls->class_dev_attrs) {
		for (i = 0; attr_name(cls->class_dev_attrs[i]); i++)
		class_device_remove_file(cd, &cls->class_dev_attrs[i]);
		}
		}

		static int class_device_add_groups(struct class_device *cd)
		{
		int i;
		int error = 0;

		if (cd->groups) {
		for (i = 0; cd->groups[i]; i++) {
		error = sysfs_create_group(&cd->kobj, cd->groups[i]);
		if (error) {
		while (--i >= 0)
		sysfs_remove_group(&cd->kobj,
		cd->groups[i]);
		goto out;
		}
		}
		}
		out:
		return error;
		}

		static void class_device_remove_groups(struct class_device *cd)
		{
		int i;
		if (cd->groups)
		for (i = 0; cd->groups[i]; i++)
		sysfs_remove_group(&cd->kobj, cd->groups[i]);
		}

		static ssize_t show_dev(struct class_device class_dev, char buf)
		{
		return print_dev_t(buf, class_dev->devt);
		}

		static struct class_device_attribute class_devt_attr =
		__ATTR(dev, S_IRUGO, show_dev, NULL);

		static ssize_t store_uevent(struct class_device *class_dev,
		const char *buf, size_t count)
		{
		kobject_uevent(&class_dev->kobj, KOBJ_ADD);
		return count;
		}

		static struct class_device_attribute class_uevent_attr =
		__ATTR(uevent, S_IWUSR, NULL, store_uevent);

		void class_device_initialize(struct class_device *class_dev)
		{
		class_dev->kobj.kset = &class_obj_subsys;
		kobject_init(&class_dev->kobj, &class_device_ktype);
		INIT_LIST_HEAD(&class_dev->node);
		}

		int class_device_add(struct class_device *class_dev)
		{
		struct class *parent_class = NULL;
		struct class_device *parent_class_dev = NULL;
		struct class_interface *class_intf;
		int error = -EINVAL;

		class_dev = class_device_get(class_dev);
		if (!class_dev)
		return -EINVAL;

		if (!strlen(class_dev->class_id))
		goto out1;

		parent_class = class_get(class_dev->class);
		if (!parent_class)
		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. */
		if (parent_class_dev)
		class_dev->kobj.parent = &parent_class_dev->kobj;
		else
		class_dev->kobj.parent = &parent_class->subsys.kobj;

		error = kobject_add(&class_dev->kobj, class_dev->kobj.parent,
		"%s", class_dev->class_id);
		if (error)
		goto out2;

		/* add the needed attributes to this device */
		error = sysfs_create_link(&class_dev->kobj,
		&parent_class->subsys.kobj, "subsystem");
		if (error)
		goto out3;

		error = class_device_create_file(class_dev, &class_uevent_attr);
		if (error)
		goto out3;

		if (MAJOR(class_dev->devt)) {
		error = class_device_create_file(class_dev, &class_devt_attr);
		if (error)
		goto out4;
		}

		error = class_device_add_attrs(class_dev);
		if (error)
		goto out5;

		if (class_dev->dev) {
		error = sysfs_create_link(&class_dev->kobj,
		&class_dev->dev->kobj, "device");
		if (error)
		goto out6;
		}

		error = class_device_add_groups(class_dev);
		if (error)
		goto out7;

		error = make_deprecated_class_device_links(class_dev);
		if (error)
		goto out8;

		kobject_uevent(&class_dev->kobj, KOBJ_ADD);

		/* notify any interfaces this device is now here */
		down(&parent_class->sem);
		list_add_tail(&class_dev->node, &parent_class->children);
		list_for_each_entry(class_intf, &parent_class->interfaces, node) {
		if (class_intf->add)
		class_intf->add(class_dev, class_intf);
		}
		up(&parent_class->sem);

		goto out1;

		out8:
		class_device_remove_groups(class_dev);
		out7:
		if (class_dev->dev)
		sysfs_remove_link(&class_dev->kobj, "device");
		out6:
		class_device_remove_attrs(class_dev);
		out5:
		if (MAJOR(class_dev->devt))
		class_device_remove_file(class_dev, &class_devt_attr);
		out4:
		class_device_remove_file(class_dev, &class_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);
		return error;
		}

		int class_device_register(struct class_device *class_dev)
		{
		class_device_initialize(class_dev);
		return class_device_add(class_dev);
		}

		/**
		* class_device_create - creates a class device and registers it with sysfs
		* @cls: pointer to the struct class that this device should be registered to.
		* @parent: pointer to the parent struct class_device of this new device, if
		* any.
		* @devt: the dev_t for the char device to be added.
		* @device: a pointer to a struct device that is assiociated with this class
		* device.
		* @fmt: string for the class device's name
		*
		* This function can be used by char device classes. A struct
		* class_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 class_device is passed in, the newly
		* created struct class_device will be a child of that device in sysfs.
		* The pointer to the struct class_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 class_device class_device_create(struct class cls,
		struct class_device *parent,
		dev_t devt,
		struct device *device,
		const char *fmt, ...)
		{
		va_list args;
		struct class_device *class_dev = NULL;
		int retval = -ENODEV;

		if (cls == NULL \|\| IS_ERR(cls))
		goto error;

		class_dev = kzalloc(sizeof(*class_dev), GFP_KERNEL);
		if (!class_dev) {
		retval = -ENOMEM;
		goto error;
		}

		class_dev->devt = devt;
		class_dev->dev = device;
		class_dev->class = cls;
		class_dev->parent = parent;
		class_dev->release = class_device_create_release;
		class_dev->uevent = class_device_create_uevent;

		va_start(args, fmt);
		vsnprintf(class_dev->class_id, BUS_ID_SIZE, fmt, args);
		va_end(args);
		retval = class_device_register(class_dev);
		if (retval)
		goto error;

		return class_dev;

		error:
		kfree(class_dev);
		return ERR_PTR(retval);
		}

		void class_device_del(struct class_device *class_dev)
		{
		struct class *parent_class = class_dev->class;
		struct class_device *parent_device = class_dev->parent;
		struct class_interface *class_intf;

		if (parent_class) {
		down(&parent_class->sem);
		list_del_init(&class_dev->node);
		list_for_each_entry(class_intf, &parent_class->interfaces, node)
		if (class_intf->remove)
		class_intf->remove(class_dev, class_intf);
		up(&parent_class->sem);
		}

		if (class_dev->dev) {
		remove_deprecated_class_device_links(class_dev);
		sysfs_remove_link(&class_dev->kobj, "device");
		}
		sysfs_remove_link(&class_dev->kobj, "subsystem");
		class_device_remove_file(class_dev, &class_uevent_attr);
		if (MAJOR(class_dev->devt))
		class_device_remove_file(class_dev, &class_devt_attr);
		class_device_remove_attrs(class_dev);
		class_device_remove_groups(class_dev);

		kobject_uevent(&class_dev->kobj, KOBJ_REMOVE);
		kobject_del(&class_dev->kobj);

		class_device_put(parent_device);
		class_put(parent_class);
		}

		void class_device_unregister(struct class_device *class_dev)
		{
		pr_debug("CLASS: Unregistering class device. ID = '%s'\n",
		class_dev->class_id);
		class_device_del(class_dev);
		class_device_put(class_dev);
		}

		/**
		* class_device_destroy - removes a class device that was created with class_device_create()
		* @cls: the pointer to the struct class that this device was registered * with.
		* @devt: 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 class_device_destroy(struct class *cls, dev_t devt)
		{
		struct class_device *class_dev = NULL;
		struct class_device *class_dev_tmp;

		down(&cls->sem);
		list_for_each_entry(class_dev_tmp, &cls->children, node) {
		if (class_dev_tmp->devt == devt) {
		class_dev = class_dev_tmp;
		break;
		}
		}
		up(&cls->sem);

		if (class_dev)
		class_device_unregister(class_dev);
		}

		struct class_device class_device_get(struct class_device class_dev)
		{
		if (class_dev)
		return to_class_dev(kobject_get(&class_dev->kobj));
		return NULL;
		}

		void class_device_put(struct class_device *class_dev)
		{
		if (class_dev)
		kobject_put(&class_dev->kobj);
		}

		/**
		* class_for_each_device - device iterator
		* @class: the class we're iterating
		@@ -897,56 +338,9 @@ struct device class_find_device(struct class class, void *data,
		}
		EXPORT_SYMBOL_GPL(class_find_device);

		/**
		* class_find_child - device iterator for locating a particular class_device
		* @class: the class we're iterating
		* @data: data for the match function
		* @match: function to check class_device
		*
		* This function returns a reference to a class_device that is 'found' for
		* later use, as determined by the @match callback.
		*
		* The callback should return 0 if the class_device doesn't match and non-zero
		* if it does. If the callback returns non-zero, this function will
		* return to the caller and not iterate over any more class_devices.
		*
		* Note, you will need to drop the reference with class_device_put() after use.
		*
		* We hold class->sem in this function, so it can not be
		* re-acquired in @match, otherwise it will self-deadlocking. For
		* example, calls to add or remove class members would be verboten.
		*/
		struct class_device class_find_child(struct class class, void *data,
		int (match)(struct class_device , void *))
		{
		struct class_device *dev;
		int found = 0;

		if (!class)
		return NULL;

		down(&class->sem);
		list_for_each_entry(dev, &class->children, node) {
		dev = class_device_get(dev);
		if (dev) {
		if (match(dev, data)) {
		found = 1;
		break;
		} else
		class_device_put(dev);
		} else
		break;
		}
		up(&class->sem);

		return found ? dev : NULL;
		}
		EXPORT_SYMBOL_GPL(class_find_child);

		int class_interface_register(struct class_interface *class_intf)
		{
		struct class *parent;
		struct class_device *class_dev;
		struct device *dev;

		if (!class_intf \|\| !class_intf->class)
		@@ -958,10 +352,6 @@ int class_interface_register(struct class_interface *class_intf)

		down(&parent->sem);
		list_add_tail(&class_intf->node, &parent->interfaces);
		if (class_intf->add) {
		list_for_each_entry(class_dev, &parent->children, node)
		class_intf->add(class_dev, class_intf);
		}
		if (class_intf->add_dev) {
		list_for_each_entry(dev, &parent->devices, node)
		class_intf->add_dev(dev, class_intf);
		@@ -974,7 +364,6 @@ int class_interface_register(struct class_interface *class_intf)
		void class_interface_unregister(struct class_interface *class_intf)
		{
		struct class *parent = class_intf->class;
		struct class_device *class_dev;
		struct device *dev;

		if (!parent)
		@@ -982,10 +371,6 @@ void class_interface_unregister(struct class_interface *class_intf)

		down(&parent->sem);
		list_del_init(&class_intf->node);
		if (class_intf->remove) {
		list_for_each_entry(class_dev, &parent->children, node)
		class_intf->remove(class_dev, class_intf);
		}
		if (class_intf->remove_dev) {
		list_for_each_entry(dev, &parent->devices, node)
		class_intf->remove_dev(dev, class_intf);
		@@ -1000,13 +385,6 @@ int __init classes_init(void)
		class_kset = kset_create_and_add("class", NULL, NULL);
		if (!class_kset)
		return -ENOMEM;

		/* ick, this is ugly, the things we go through to keep from showing up
		* in sysfs... */
		kset_init(&class_obj_subsys);
		kobject_set_name(&class_obj_subsys.kobj, "class_obj");
		if (!class_obj_subsys.kobj.parent)
		class_obj_subsys.kobj.parent = &class_obj_subsys.kobj;
		return 0;
		}

		@@ -1017,19 +395,5 @@ EXPORT_SYMBOL_GPL(class_unregister);
		EXPORT_SYMBOL_GPL(class_create);
		EXPORT_SYMBOL_GPL(class_destroy);

		EXPORT_SYMBOL_GPL(class_device_register);
		EXPORT_SYMBOL_GPL(class_device_unregister);
		EXPORT_SYMBOL_GPL(class_device_initialize);
		EXPORT_SYMBOL_GPL(class_device_add);
		EXPORT_SYMBOL_GPL(class_device_del);
		EXPORT_SYMBOL_GPL(class_device_get);
		EXPORT_SYMBOL_GPL(class_device_put);
		EXPORT_SYMBOL_GPL(class_device_create);
		EXPORT_SYMBOL_GPL(class_device_destroy);
		EXPORT_SYMBOL_GPL(class_device_create_file);
		EXPORT_SYMBOL_GPL(class_device_remove_file);
		EXPORT_SYMBOL_GPL(class_device_create_bin_file);
		EXPORT_SYMBOL_GPL(class_device_remove_bin_file);

		EXPORT_SYMBOL_GPL(class_interface_register);
		EXPORT_SYMBOL_GPL(class_interface_unregister);

include/linux/device.h

+0 −97

Original line number	Diff line number	Diff line
		@@ -35,7 +35,6 @@ struct device;
		struct device_driver;
		struct driver_private;
		struct class;
		struct class_device;
		struct bus_type;
		struct bus_type_private;

		@@ -190,13 +189,10 @@ struct class {
		struct kset class_dirs;
		struct semaphore sem; /* locks children, devices, interfaces */
		struct class_attribute *class_attrs;
		struct class_device_attribute *class_dev_attrs;
		struct device_attribute *dev_attrs;

		int (uevent)(struct class_device dev, struct kobj_uevent_env *env);
		int (dev_uevent)(struct device dev, struct kobj_uevent_env *env);

		void (release)(struct class_device dev);
		void (class_release)(struct class class);
		void (dev_release)(struct device dev);

		@@ -210,9 +206,6 @@ extern int class_for_each_device(struct class class, void data,
		int (fn)(struct device dev, void *data));
		extern struct device class_find_device(struct class class, void *data,
		int (match)(struct device , void *));
		extern struct class_device class_find_child(struct class class, void *data,
		int (match)(struct class_device , void *));


		struct class_attribute {
		struct attribute attr;
		@@ -228,92 +221,10 @@ extern int __must_check class_create_file(struct class *class,
		extern void class_remove_file(struct class *class,
		const struct class_attribute *attr);

		struct class_device_attribute {
		struct attribute attr;
		ssize_t (show)(struct class_device , char *buf);
		ssize_t (store)(struct class_device , const char *buf, size_t count);
		};

		#define CLASS_DEVICE_ATTR(_name, _mode, _show, _store) \
		struct class_device_attribute class_device_attr_##_name = \
		__ATTR(_name, _mode, _show, _store)

		extern int __must_check class_device_create_file(struct class_device *,
		const struct class_device_attribute *);

		/**
		* struct class_device - class devices
		* @class: pointer to the parent class for this class device. This is required.
		* @devt: for internal use by the driver core only.
		* @node: for internal use by the driver core only.
		* @kobj: for internal use by the driver core only.
		* @groups: optional additional groups to be created
		* @dev: if set, a symlink to the struct device is created in the sysfs
		* directory for this struct class device.
		* @class_data: pointer to whatever you want to store here for this struct
		* class_device. Use class_get_devdata() and class_set_devdata() to get and
		* set this pointer.
		* @parent: pointer to a struct class_device that is the parent of this struct
		* class_device. If NULL, this class_device will show up at the root of the
		* struct class in sysfs (which is probably what you want to have happen.)
		* @release: pointer to a release function for this struct class_device. If
		* set, this will be called instead of the class specific release function.
		* Only use this if you want to override the default release function, like
		* when you are nesting class_device structures.
		* @uevent: pointer to a uevent function for this struct class_device. If
		* set, this will be called instead of the class specific uevent function.
		* Only use this if you want to override the default uevent function, like
		* when you are nesting class_device structures.
		*/
		struct class_device {
		struct list_head node;

		struct kobject kobj;
		struct class *class;
		dev_t devt;
		struct device *dev;
		void *class_data;
		struct class_device *parent;
		struct attribute_group **groups;

		void (release)(struct class_device dev);
		int (uevent)(struct class_device dev, struct kobj_uevent_env *env);
		char class_id[BUS_ID_SIZE];
		};

		static inline void class_get_devdata(struct class_device dev)
		{
		return dev->class_data;
		}

		static inline void class_set_devdata(struct class_device dev, void data)
		{
		dev->class_data = data;
		}


		extern int __must_check class_device_register(struct class_device *);
		extern void class_device_unregister(struct class_device *);
		extern void class_device_initialize(struct class_device *);
		extern int __must_check class_device_add(struct class_device *);
		extern void class_device_del(struct class_device *);

		extern struct class_device class_device_get(struct class_device );
		extern void class_device_put(struct class_device *);

		extern void class_device_remove_file(struct class_device *,
		const struct class_device_attribute *);
		extern int __must_check class_device_create_bin_file(struct class_device *,
		struct bin_attribute *);
		extern void class_device_remove_bin_file(struct class_device *,
		struct bin_attribute *);

		struct class_interface {
		struct list_head node;
		struct class *class;

		int (add) (struct class_device , struct class_interface *);
		void (remove) (struct class_device , struct class_interface *);
		int (add_dev) (struct device , struct class_interface *);
		void (remove_dev) (struct device , struct class_interface *);
		};
		@@ -323,13 +234,6 @@ extern void class_interface_unregister(struct class_interface *);

		extern struct class class_create(struct module owner, const char *name);
		extern void class_destroy(struct class *cls);
		extern struct class_device class_device_create(struct class cls,
		struct class_device *parent,
		dev_t devt,
		struct device *device,
		const char *fmt, ...)
		__attribute__((format(printf, 5, 6)));
		extern void class_device_destroy(struct class *cls, dev_t devt);

		/*
		* The type of device, "struct device" is embedded in. A class
		@@ -465,7 +369,6 @@ struct device {
		spinlock_t devres_lock;
		struct list_head devres_head;

		/* class_device migration path */
		struct list_head node;
		struct class *class;
		dev_t devt; /* dev_t, creates the sysfs "dev" */