2 * kobject.h - generic kernel object infrastructure.
4 * Copyright (c) 2002-2003 Patrick Mochel
5 * Copyright (c) 2002-2003 Open Source Development Labs
7 * This file is released under the GPLv2.
10 * Please read Documentation/kobject.txt before using the kobject
11 * interface, ESPECIALLY the parts about reference counts and object
20 #include <linux/types.h>
21 #include <linux/list.h>
22 #include <linux/sysfs.h>
23 #include <linux/compiler.h>
24 #include <linux/spinlock.h>
25 #include <linux/kref.h>
26 #include <linux/kernel.h>
27 #include <linux/wait.h>
28 #include <asm/atomic.h>
30 #define KOBJ_NAME_LEN 20
31 #define UEVENT_HELPER_PATH_LEN 256
32 #define UEVENT_NUM_ENVP 32 /* number of env pointers */
33 #define UEVENT_BUFFER_SIZE 2048 /* buffer for the variables */
35 /* path to the userspace helper executed on an event */
36 extern char uevent_helper
[];
38 /* counter to tag the uevent, read only except for the kobject core */
39 extern u64 uevent_seqnum
;
42 * The actions here must match the index to the string array
43 * in lib/kobject_uevent.c
45 * Do not add new actions here without checking with the driver-core
46 * maintainers. Action strings are not meant to express subsystem
47 * or device specific properties. In most cases you want to send a
48 * kobject_uevent_env(kobj, KOBJ_CHANGE, env) with additional event
49 * specific variables added to the event environment.
61 /* The list of strings defining the valid kobject actions as specified above */
62 extern const char *kobject_actions
[];
66 char name
[KOBJ_NAME_LEN
];
68 struct list_head entry
;
69 struct kobject
* parent
;
71 struct kobj_type
* ktype
;
72 struct sysfs_dirent
* sd
;
73 wait_queue_head_t poll
;
76 extern int kobject_set_name(struct kobject
*, const char *, ...)
77 __attribute__((format(printf
,2,3)));
79 static inline const char * kobject_name(const struct kobject
* kobj
)
84 extern void kobject_init(struct kobject
*);
85 extern void kobject_cleanup(struct kobject
*);
87 extern int __must_check
kobject_add(struct kobject
*);
88 extern int __must_check
kobject_shadow_add(struct kobject
*kobj
,
89 struct sysfs_dirent
*shadow_parent
);
90 extern void kobject_del(struct kobject
*);
92 extern int __must_check
kobject_rename(struct kobject
*, const char *new_name
);
93 extern int __must_check
kobject_shadow_rename(struct kobject
*kobj
,
94 struct sysfs_dirent
*new_parent
,
95 const char *new_name
);
96 extern int __must_check
kobject_move(struct kobject
*, struct kobject
*);
98 extern int __must_check
kobject_register(struct kobject
*);
99 extern void kobject_unregister(struct kobject
*);
101 extern struct kobject
* kobject_get(struct kobject
*);
102 extern void kobject_put(struct kobject
*);
104 extern struct kobject
*kobject_kset_add_dir(struct kset
*kset
,
105 struct kobject
*, const char *);
106 extern struct kobject
*kobject_add_dir(struct kobject
*, const char *);
108 extern char * kobject_get_path(struct kobject
*, gfp_t
);
111 void (*release
)(struct kobject
*);
112 struct sysfs_ops
* sysfs_ops
;
113 struct attribute
** default_attrs
;
116 struct kobj_uevent_env
{
117 char *envp
[UEVENT_NUM_ENVP
];
119 char buf
[UEVENT_BUFFER_SIZE
];
123 struct kset_uevent_ops
{
124 int (*filter
)(struct kset
*kset
, struct kobject
*kobj
);
125 const char *(*name
)(struct kset
*kset
, struct kobject
*kobj
);
126 int (*uevent
)(struct kset
*kset
, struct kobject
*kobj
,
127 struct kobj_uevent_env
*env
);
131 * struct kset - a set of kobjects of a specific type, belonging
132 * to a specific subsystem.
134 * All kobjects of a kset should be embedded in an identical
135 * type. This type may have a descriptor, which the kset points
136 * to. This allows there to exist sets of objects of the same
137 * type in different subsystems.
139 * A subsystem does not have to be a list of only one type
140 * of object; multiple ksets can belong to one subsystem. All
141 * ksets of a subsystem share the subsystem's lock.
143 * Each kset can support specific event variables; it can
144 * supress the event generation or add subsystem specific
145 * variables carried with the event.
148 struct kobj_type
* ktype
;
149 struct list_head list
;
150 spinlock_t list_lock
;
152 struct kset_uevent_ops
* uevent_ops
;
156 extern void kset_init(struct kset
* k
);
157 extern int __must_check
kset_add(struct kset
* k
);
158 extern int __must_check
kset_register(struct kset
* k
);
159 extern void kset_unregister(struct kset
* k
);
161 static inline struct kset
* to_kset(struct kobject
* kobj
)
163 return kobj
? container_of(kobj
,struct kset
,kobj
) : NULL
;
166 static inline struct kset
* kset_get(struct kset
* k
)
168 return k
? to_kset(kobject_get(&k
->kobj
)) : NULL
;
171 static inline void kset_put(struct kset
* k
)
173 kobject_put(&k
->kobj
);
176 static inline struct kobj_type
* get_ktype(struct kobject
* k
)
178 if (k
->kset
&& k
->kset
->ktype
)
179 return k
->kset
->ktype
;
184 extern struct kobject
* kset_find_obj(struct kset
*, const char *);
188 * Use this when initializing an embedded kset with no other
189 * fields to initialize.
191 #define set_kset_name(str) .kset = { .kobj = { .name = str } }
194 #define decl_subsys(_name,_type,_uevent_ops) \
195 struct kset _name##_subsys = { \
196 .kobj = { .name = __stringify(_name) }, \
198 .uevent_ops =_uevent_ops, \
200 #define decl_subsys_name(_varname,_name,_type,_uevent_ops) \
201 struct kset _varname##_subsys = { \
202 .kobj = { .name = __stringify(_name) }, \
204 .uevent_ops =_uevent_ops, \
207 /* The global /sys/kernel/ subsystem for people to chain off of */
208 extern struct kset kernel_subsys
;
209 /* The global /sys/hypervisor/ subsystem */
210 extern struct kset hypervisor_subsys
;
213 * Helpers for setting the kset of registered objects.
214 * Often, a registered object belongs to a kset embedded in a
215 * subsystem. These do no magic, just make the resulting code
220 * kobj_set_kset_s(obj,subsys) - set kset for embedded kobject.
221 * @obj: ptr to some object type.
222 * @subsys: a subsystem object (not a ptr).
224 * Can be used for any object type with an embedded ->kobj.
227 #define kobj_set_kset_s(obj,subsys) \
228 (obj)->kobj.kset = &(subsys)
230 extern void subsystem_init(struct kset
*);
231 extern int __must_check
subsystem_register(struct kset
*);
232 extern void subsystem_unregister(struct kset
*);
234 static inline struct kset
*subsys_get(struct kset
*s
)
241 static inline void subsys_put(struct kset
*s
)
246 struct subsys_attribute
{
247 struct attribute attr
;
248 ssize_t (*show
)(struct kset
*, char *);
249 ssize_t (*store
)(struct kset
*, const char *, size_t);
252 extern int __must_check
subsys_create_file(struct kset
*,
253 struct subsys_attribute
*);
255 #if defined(CONFIG_HOTPLUG)
256 int kobject_uevent(struct kobject
*kobj
, enum kobject_action action
);
257 int kobject_uevent_env(struct kobject
*kobj
, enum kobject_action action
,
260 int add_uevent_var(struct kobj_uevent_env
*env
, const char *format
, ...)
261 __attribute__((format (printf
, 2, 3)));
263 static inline int kobject_uevent(struct kobject
*kobj
, enum kobject_action action
)
265 static inline int kobject_uevent_env(struct kobject
*kobj
,
266 enum kobject_action action
,
270 static inline int add_uevent_var(struct kobj_uevent_env
*env
, const char *format
, ...)
274 #endif /* __KERNEL__ */
275 #endif /* _KOBJECT_H_ */
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