#ifndef _LINUX_KOBJECT_H
#define _LINUX_KOBJECT_H

#include <linux/types.h>
#include <linux/list.h>
#include <linux/kref.h>
#include <linux/kobject_ns.h>
#include <linux/kernel.h>

/*
 * The actions here must match the index to the string array
 * in lib/kobject_uevent.c
 *
 * Do not add new actions here without checking with the driver-core
 * maintainers. Action strings are not meant to express subsystem
 * or device specific properties. In most cases you want to send a
 * kobject_uevent_env(kobj, KOBJ_CHANGE, env) with additional event
 * specific variables added to the event environment.
 */
enum kobject_action {
	KOBJ_ADD,
	KOBJ_REMOVE,
	KOBJ_CHANGE,
	KOBJ_MOVE,
	KOBJ_ONLINE,
	KOBJ_OFFLINE,
	KOBJ_MAX
};

struct kobject {
	const char		*name;
	struct list_head	entry;
	struct kobject		*parent;
	struct kset		*kset;
	struct kobj_type	*ktype;
	struct kernfs_node	*sd;
	struct kref		kref;
#ifdef CONFIG_DEBUG_KOBJECT_RELEASE
	struct delayed_work	release;
#endif
	unsigned int state_initialized:1;
	unsigned int state_in_sysfs:1;
	unsigned int state_add_uevent_sent:1;
	unsigned int state_remove_uevent_sent:1;
	unsigned int uevent_suppress:1;
};

extern int kobject_set_name(struct kobject *kobj, const char *name, ...);
extern int kobject_set_name_vargs(struct kobject *kobj, const char *fmt,
				  va_list vargs);

static inline const char *kobject_name(const struct kobject *kobj)
{
	return kobj->name;
}

extern void kobject_init(struct kobject *kobj, struct kobj_type *ktype);
extern struct kobject *kobject_get(struct kobject *kobj);
extern void kobject_put(struct kobject *kobj);

struct kobj_type {
	void (*release)(struct kobject *kobj);
	const struct sysfs_ops *sysfs_ops;
	struct attribute **default_attrs;
	const struct kobj_ns_type_operations *(*child_ns_type)(struct kobject *kobj);
	const void *(*namespace)(struct kobject *kobj);
};

struct kset_uevent_ops {
	int (* const filter)(struct kset *kset, struct kobject *kobj);
	const char *(* const name)(struct kset *kset, struct kobject *kobj);
	int (* const uevent)(struct kset *kset, struct kobject *kobj,
		      struct kobj_uevent_env *env);
};

static inline struct kobj_type *get_ktype(struct kobject *kobj)
{
	return kobj->ktype;
}

/**
 * struct kset - a set of kobjects of a specific type, belonging to a specific subsystem.
 *
 * A kset defines a group of kobjects.  They can be individually
 * different "types" but overall these kobjects all want to be grouped
 * together and operated on in the same manner.  ksets are used to
 * define the attribute callbacks and other common events that happen to
 * a kobject.
 *
 * @list: the list of all kobjects for this kset
 * @list_lock: a lock for iterating over the kobjects
 * @kobj: the embedded kobject for this kset (recursion, isn't it fun...)
 * @uevent_ops: the set of uevent operations for this kset.  These are
 * called whenever a kobject has something happen to it so that the kset
 * can add new environment variables, or filter out the uevents if so
 * desired.
 */
struct kset {
	struct list_head list;
	spinlock_t list_lock;
	struct kobject kobj;
	const struct kset_uevent_ops *uevent_ops;
};

extern int kset_register(struct kset *kset);
extern void kset_unregister(struct kset *kset);
extern struct kset * kset_create_and_add(const char *name,
						const struct kset_uevent_ops *u,
						struct kobject *parent_kobj);

static inline struct kset *to_kset(struct kobject *kobj)
{
	return kobj ? container_of(kobj, struct kset, kobj) : NULL;
}

static inline struct kset *kset_get(struct kset *k)
{
	return k ? to_kset(kobject_get(&k->kobj)) : NULL;
}

static inline void kset_put(struct kset *k)
{
	kobject_put(&k->kobj);
}

static inline int add_uevent_var(struct kobj_uevent_env *env, const char *format, ...) { return 0;}

extern int kobject_init_and_add(struct kobject *kobj,
			 struct kobj_type *ktype, struct kobject *parent,
			 const char *fmt, ...);

extern void kobject_del(struct kobject *kobj);
extern struct kobject *kset_find_obj(struct kset *, const char *);
extern struct kobject *kset_find_obj_hinted(struct kset *, const char *,
						struct kobject *);

#endif /* _LINUX_KOBJECT_H */