2 * kobject.h - generic kernel object infrastructure.
4 * Copyright (c) 2002-2003 Patrick Mochel
5 * Copyright (c) 2002-2003 Open Source Development Labs
6 * Copyright (c) 2006-2008 Greg Kroah-Hartman <greg@kroah.com>
7 * Copyright (c) 2006-2008 Novell Inc.
9 * This file is released under the GPLv2.
11 * Please read Documentation/kobject.txt before using the kobject
12 * interface, ESPECIALLY the parts about reference counts and object
19 #include <linux/types.h>
20 #include <linux/list.h>
21 #include <linux/sysfs.h>
22 #include <linux/compiler.h>
23 #include <linux/spinlock.h>
24 #include <linux/kref.h>
25 #include <linux/kernel.h>
26 #include <linux/wait.h>
27 #include <asm/atomic.h>
29 #define UEVENT_HELPER_PATH_LEN 256
30 #define UEVENT_NUM_ENVP 32 /* number of env pointers */
31 #define UEVENT_BUFFER_SIZE 2048 /* buffer for the variables */
33 /* path to the userspace helper executed on an event */
34 extern char uevent_helper[];
36 /* counter to tag the uevent, read only except for the kobject core */
37 extern u64 uevent_seqnum;
40 * The actions here must match the index to the string array
41 * in lib/kobject_uevent.c
43 * Do not add new actions here without checking with the driver-core
44 * maintainers. Action strings are not meant to express subsystem
45 * or device specific properties. In most cases you want to send a
46 * kobject_uevent_env(kobj, KOBJ_CHANGE, env) with additional event
47 * specific variables added to the event environment.
61 struct list_head entry;
62 struct kobject *parent;
64 struct kobj_type *ktype;
65 struct sysfs_dirent *sd;
67 unsigned int state_initialized:1;
68 unsigned int state_in_sysfs:1;
69 unsigned int state_add_uevent_sent:1;
70 unsigned int state_remove_uevent_sent:1;
73 extern int kobject_set_name(struct kobject *kobj, const char *name, ...)
74 __attribute__((format(printf, 2, 3)));
75 extern int kobject_set_name_vargs(struct kobject *kobj, const char *fmt,
78 static inline const char *kobject_name(const struct kobject *kobj)
83 extern void kobject_init(struct kobject *kobj, struct kobj_type *ktype);
84 extern int __must_check kobject_add(struct kobject *kobj,
85 struct kobject *parent,
86 const char *fmt, ...);
87 extern int __must_check kobject_init_and_add(struct kobject *kobj,
88 struct kobj_type *ktype,
89 struct kobject *parent,
90 const char *fmt, ...);
92 extern void kobject_del(struct kobject *kobj);
94 extern struct kobject * __must_check kobject_create(void);
95 extern struct kobject * __must_check kobject_create_and_add(const char *name,
96 struct kobject *parent);
98 extern int __must_check kobject_rename(struct kobject *, const char *new_name);
99 extern int __must_check kobject_move(struct kobject *, struct kobject *);
101 extern struct kobject *kobject_get(struct kobject *kobj);
102 extern void kobject_put(struct kobject *kobj);
104 extern char *kobject_get_path(struct kobject *kobj, gfp_t flag);
107 void (*release)(struct kobject *kobj);
108 struct sysfs_ops *sysfs_ops;
109 struct attribute **default_attrs;
112 struct kobj_uevent_env {
113 char *envp[UEVENT_NUM_ENVP];
115 char buf[UEVENT_BUFFER_SIZE];
119 struct kset_uevent_ops {
120 int (*filter)(struct kset *kset, struct kobject *kobj);
121 const char *(*name)(struct kset *kset, struct kobject *kobj);
122 int (*uevent)(struct kset *kset, struct kobject *kobj,
123 struct kobj_uevent_env *env);
126 struct kobj_attribute {
127 struct attribute attr;
128 ssize_t (*show)(struct kobject *kobj, struct kobj_attribute *attr,
130 ssize_t (*store)(struct kobject *kobj, struct kobj_attribute *attr,
131 const char *buf, size_t count);
134 extern struct sysfs_ops kobj_sysfs_ops;
137 * struct kset - a set of kobjects of a specific type, belonging to a specific subsystem.
139 * A kset defines a group of kobjects. They can be individually
140 * different "types" but overall these kobjects all want to be grouped
141 * together and operated on in the same manner. ksets are used to
142 * define the attribute callbacks and other common events that happen to
145 * @list: the list of all kobjects for this kset
146 * @list_lock: a lock for iterating over the kobjects
147 * @kobj: the embedded kobject for this kset (recursion, isn't it fun...)
148 * @uevent_ops: the set of uevent operations for this kset. These are
149 * called whenever a kobject has something happen to it so that the kset
150 * can add new environment variables, or filter out the uevents if so
154 struct list_head list;
155 spinlock_t list_lock;
157 struct kset_uevent_ops *uevent_ops;
160 extern void kset_init(struct kset *kset);
161 extern int __must_check kset_register(struct kset *kset);
162 extern void kset_unregister(struct kset *kset);
163 extern struct kset * __must_check kset_create_and_add(const char *name,
164 struct kset_uevent_ops *u,
165 struct kobject *parent_kobj);
167 static inline struct kset *to_kset(struct kobject *kobj)
169 return kobj ? container_of(kobj, struct kset, kobj) : NULL;
172 static inline struct kset *kset_get(struct kset *k)
174 return k ? to_kset(kobject_get(&k->kobj)) : NULL;
177 static inline void kset_put(struct kset *k)
179 kobject_put(&k->kobj);
182 static inline struct kobj_type *get_ktype(struct kobject *kobj)
187 extern struct kobject *kset_find_obj(struct kset *, const char *);
189 /* The global /sys/kernel/ kobject for people to chain off of */
190 extern struct kobject *kernel_kobj;
191 /* The global /sys/kernel/mm/ kobject for people to chain off of */
192 extern struct kobject *mm_kobj;
193 /* The global /sys/hypervisor/ kobject for people to chain off of */
194 extern struct kobject *hypervisor_kobj;
195 /* The global /sys/power/ kobject for people to chain off of */
196 extern struct kobject *power_kobj;
197 /* The global /sys/firmware/ kobject for people to chain off of */
198 extern struct kobject *firmware_kobj;
200 #if defined(CONFIG_HOTPLUG)
201 int kobject_uevent(struct kobject *kobj, enum kobject_action action);
202 int kobject_uevent_env(struct kobject *kobj, enum kobject_action action,
205 int add_uevent_var(struct kobj_uevent_env *env, const char *format, ...)
206 __attribute__((format (printf, 2, 3)));
208 int kobject_action_type(const char *buf, size_t count,
209 enum kobject_action *type);
211 static inline int kobject_uevent(struct kobject *kobj,
212 enum kobject_action action)
214 static inline int kobject_uevent_env(struct kobject *kobj,
215 enum kobject_action action,
219 static inline int add_uevent_var(struct kobj_uevent_env *env,
220 const char *format, ...)
223 static inline int kobject_action_type(const char *buf, size_t count,
224 enum kobject_action *type)
228 #endif /* _KOBJECT_H_ */