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1da177e4 LT |
1 | /* |
2 | * kobject.h - generic kernel object infrastructure. | |
3 | * | |
4 | * Copyright (c) 2002-2003 Patrick Mochel | |
5 | * Copyright (c) 2002-2003 Open Source Development Labs | |
6 | * | |
7 | * This file is released under the GPLv2. | |
8 | * | |
9 | * | |
10 | * Please read Documentation/kobject.txt before using the kobject | |
11 | * interface, ESPECIALLY the parts about reference counts and object | |
12 | * destructors. | |
13 | */ | |
14 | ||
15 | #ifndef _KOBJECT_H_ | |
16 | #define _KOBJECT_H_ | |
17 | ||
18 | #ifdef __KERNEL__ | |
19 | ||
20 | #include <linux/types.h> | |
21 | #include <linux/list.h> | |
22 | #include <linux/sysfs.h> | |
4a7fb636 | 23 | #include <linux/compiler.h> |
1da177e4 | 24 | #include <linux/spinlock.h> |
1da177e4 | 25 | #include <linux/kref.h> |
1da177e4 | 26 | #include <linux/kernel.h> |
4508a7a7 | 27 | #include <linux/wait.h> |
1da177e4 LT |
28 | #include <asm/atomic.h> |
29 | ||
312c004d KS |
30 | #define KOBJ_NAME_LEN 20 |
31 | #define UEVENT_HELPER_PATH_LEN 256 | |
0296b228 KS |
32 | |
33 | /* path to the userspace helper executed on an event */ | |
312c004d | 34 | extern char uevent_helper[]; |
0296b228 | 35 | |
312c004d KS |
36 | /* counter to tag the uevent, read only except for the kobject core */ |
37 | extern u64 uevent_seqnum; | |
1da177e4 | 38 | |
60a96a59 KS |
39 | /* |
40 | * The actions here must match the index to the string array | |
41 | * in lib/kobject_uevent.c | |
42 | * | |
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. | |
48 | */ | |
0296b228 | 49 | enum kobject_action { |
60a96a59 KS |
50 | KOBJ_ADD, |
51 | KOBJ_REMOVE, | |
52 | KOBJ_CHANGE, | |
53 | KOBJ_MOVE, | |
54 | KOBJ_ONLINE, | |
55 | KOBJ_OFFLINE, | |
56 | KOBJ_MAX | |
0296b228 KS |
57 | }; |
58 | ||
1da177e4 | 59 | struct kobject { |
f3b4f3c6 | 60 | const char * k_name; |
1da177e4 LT |
61 | char name[KOBJ_NAME_LEN]; |
62 | struct kref kref; | |
63 | struct list_head entry; | |
64 | struct kobject * parent; | |
65 | struct kset * kset; | |
66 | struct kobj_type * ktype; | |
608e266a | 67 | struct sysfs_dirent * sd; |
4508a7a7 | 68 | wait_queue_head_t poll; |
1da177e4 LT |
69 | }; |
70 | ||
71 | extern int kobject_set_name(struct kobject *, const char *, ...) | |
72 | __attribute__((format(printf,2,3))); | |
73 | ||
f3b4f3c6 | 74 | static inline const char * kobject_name(const struct kobject * kobj) |
1da177e4 LT |
75 | { |
76 | return kobj->k_name; | |
77 | } | |
78 | ||
79 | extern void kobject_init(struct kobject *); | |
80 | extern void kobject_cleanup(struct kobject *); | |
81 | ||
4a7fb636 | 82 | extern int __must_check kobject_add(struct kobject *); |
608e266a TH |
83 | extern int __must_check kobject_shadow_add(struct kobject *kobj, |
84 | struct sysfs_dirent *shadow_parent); | |
1da177e4 LT |
85 | extern void kobject_del(struct kobject *); |
86 | ||
4a7fb636 | 87 | extern int __must_check kobject_rename(struct kobject *, const char *new_name); |
b592fcfe | 88 | extern int __must_check kobject_shadow_rename(struct kobject *kobj, |
608e266a TH |
89 | struct sysfs_dirent *new_parent, |
90 | const char *new_name); | |
8a82472f | 91 | extern int __must_check kobject_move(struct kobject *, struct kobject *); |
1da177e4 | 92 | |
4a7fb636 | 93 | extern int __must_check kobject_register(struct kobject *); |
1da177e4 LT |
94 | extern void kobject_unregister(struct kobject *); |
95 | ||
96 | extern struct kobject * kobject_get(struct kobject *); | |
97 | extern void kobject_put(struct kobject *); | |
98 | ||
86406245 KS |
99 | extern struct kobject *kobject_kset_add_dir(struct kset *kset, |
100 | struct kobject *, const char *); | |
7423172a JN |
101 | extern struct kobject *kobject_add_dir(struct kobject *, const char *); |
102 | ||
fd4f2df2 | 103 | extern char * kobject_get_path(struct kobject *, gfp_t); |
1da177e4 LT |
104 | |
105 | struct kobj_type { | |
106 | void (*release)(struct kobject *); | |
107 | struct sysfs_ops * sysfs_ops; | |
108 | struct attribute ** default_attrs; | |
109 | }; | |
110 | ||
111 | ||
112 | /** | |
113 | * kset - a set of kobjects of a specific type, belonging | |
114 | * to a specific subsystem. | |
115 | * | |
116 | * All kobjects of a kset should be embedded in an identical | |
117 | * type. This type may have a descriptor, which the kset points | |
118 | * to. This allows there to exist sets of objects of the same | |
119 | * type in different subsystems. | |
120 | * | |
121 | * A subsystem does not have to be a list of only one type | |
122 | * of object; multiple ksets can belong to one subsystem. All | |
123 | * ksets of a subsystem share the subsystem's lock. | |
124 | * | |
312c004d KS |
125 | * Each kset can support specific event variables; it can |
126 | * supress the event generation or add subsystem specific | |
127 | * variables carried with the event. | |
1da177e4 | 128 | */ |
312c004d | 129 | struct kset_uevent_ops { |
1da177e4 | 130 | int (*filter)(struct kset *kset, struct kobject *kobj); |
419cab3f | 131 | const char *(*name)(struct kset *kset, struct kobject *kobj); |
312c004d | 132 | int (*uevent)(struct kset *kset, struct kobject *kobj, char **envp, |
1da177e4 LT |
133 | int num_envp, char *buffer, int buffer_size); |
134 | }; | |
135 | ||
136 | struct kset { | |
1da177e4 LT |
137 | struct kobj_type * ktype; |
138 | struct list_head list; | |
139 | spinlock_t list_lock; | |
140 | struct kobject kobj; | |
312c004d | 141 | struct kset_uevent_ops * uevent_ops; |
1da177e4 LT |
142 | }; |
143 | ||
144 | ||
145 | extern void kset_init(struct kset * k); | |
4a7fb636 AM |
146 | extern int __must_check kset_add(struct kset * k); |
147 | extern int __must_check kset_register(struct kset * k); | |
1da177e4 LT |
148 | extern void kset_unregister(struct kset * k); |
149 | ||
150 | static inline struct kset * to_kset(struct kobject * kobj) | |
151 | { | |
152 | return kobj ? container_of(kobj,struct kset,kobj) : NULL; | |
153 | } | |
154 | ||
155 | static inline struct kset * kset_get(struct kset * k) | |
156 | { | |
157 | return k ? to_kset(kobject_get(&k->kobj)) : NULL; | |
158 | } | |
159 | ||
160 | static inline void kset_put(struct kset * k) | |
161 | { | |
162 | kobject_put(&k->kobj); | |
163 | } | |
164 | ||
165 | static inline struct kobj_type * get_ktype(struct kobject * k) | |
166 | { | |
167 | if (k->kset && k->kset->ktype) | |
168 | return k->kset->ktype; | |
169 | else | |
170 | return k->ktype; | |
171 | } | |
172 | ||
173 | extern struct kobject * kset_find_obj(struct kset *, const char *); | |
174 | ||
175 | ||
176 | /** | |
177 | * Use this when initializing an embedded kset with no other | |
178 | * fields to initialize. | |
179 | */ | |
180 | #define set_kset_name(str) .kset = { .kobj = { .name = str } } | |
181 | ||
182 | ||
312c004d | 183 | #define decl_subsys(_name,_type,_uevent_ops) \ |
823bccfc GKH |
184 | struct kset _name##_subsys = { \ |
185 | .kobj = { .name = __stringify(_name) }, \ | |
186 | .ktype = _type, \ | |
187 | .uevent_ops =_uevent_ops, \ | |
1da177e4 | 188 | } |
312c004d | 189 | #define decl_subsys_name(_varname,_name,_type,_uevent_ops) \ |
823bccfc GKH |
190 | struct kset _varname##_subsys = { \ |
191 | .kobj = { .name = __stringify(_name) }, \ | |
192 | .ktype = _type, \ | |
193 | .uevent_ops =_uevent_ops, \ | |
1da177e4 LT |
194 | } |
195 | ||
196 | /* The global /sys/kernel/ subsystem for people to chain off of */ | |
823bccfc | 197 | extern struct kset kernel_subsys; |
4039483f | 198 | /* The global /sys/hypervisor/ subsystem */ |
823bccfc | 199 | extern struct kset hypervisor_subsys; |
1da177e4 LT |
200 | |
201 | /** | |
202 | * Helpers for setting the kset of registered objects. | |
203 | * Often, a registered object belongs to a kset embedded in a | |
204 | * subsystem. These do no magic, just make the resulting code | |
205 | * easier to follow. | |
206 | */ | |
207 | ||
208 | /** | |
209 | * kobj_set_kset_s(obj,subsys) - set kset for embedded kobject. | |
210 | * @obj: ptr to some object type. | |
211 | * @subsys: a subsystem object (not a ptr). | |
212 | * | |
213 | * Can be used for any object type with an embedded ->kobj. | |
214 | */ | |
215 | ||
216 | #define kobj_set_kset_s(obj,subsys) \ | |
823bccfc | 217 | (obj)->kobj.kset = &(subsys) |
1da177e4 LT |
218 | |
219 | /** | |
220 | * kset_set_kset_s(obj,subsys) - set kset for embedded kset. | |
221 | * @obj: ptr to some object type. | |
222 | * @subsys: a subsystem object (not a ptr). | |
223 | * | |
224 | * Can be used for any object type with an embedded ->kset. | |
225 | * Sets the kset of @obj's embedded kobject (via its embedded | |
226 | * kset) to @subsys.kset. This makes @obj a member of that | |
227 | * kset. | |
228 | */ | |
229 | ||
230 | #define kset_set_kset_s(obj,subsys) \ | |
823bccfc | 231 | (obj)->kset.kobj.kset = &(subsys) |
1da177e4 LT |
232 | |
233 | /** | |
234 | * subsys_set_kset(obj,subsys) - set kset for subsystem | |
235 | * @obj: ptr to some object type. | |
236 | * @subsys: a subsystem object (not a ptr). | |
237 | * | |
238 | * Can be used for any object type with an embedded ->subsys. | |
239 | * Sets the kset of @obj's kobject to @subsys.kset. This makes | |
240 | * the object a member of that kset. | |
241 | */ | |
242 | ||
243 | #define subsys_set_kset(obj,_subsys) \ | |
823bccfc | 244 | (obj)->subsys.kobj.kset = &(_subsys) |
1da177e4 | 245 | |
823bccfc GKH |
246 | extern void subsystem_init(struct kset *); |
247 | extern int __must_check subsystem_register(struct kset *); | |
248 | extern void subsystem_unregister(struct kset *); | |
1da177e4 | 249 | |
823bccfc | 250 | static inline struct kset *subsys_get(struct kset *s) |
1da177e4 | 251 | { |
823bccfc GKH |
252 | if (s) |
253 | return kset_get(s); | |
254 | return NULL; | |
1da177e4 LT |
255 | } |
256 | ||
823bccfc | 257 | static inline void subsys_put(struct kset *s) |
1da177e4 | 258 | { |
823bccfc | 259 | kset_put(s); |
1da177e4 LT |
260 | } |
261 | ||
262 | struct subsys_attribute { | |
263 | struct attribute attr; | |
823bccfc GKH |
264 | ssize_t (*show)(struct kset *, char *); |
265 | ssize_t (*store)(struct kset *, const char *, size_t); | |
1da177e4 LT |
266 | }; |
267 | ||
823bccfc | 268 | extern int __must_check subsys_create_file(struct kset *, |
4a7fb636 | 269 | struct subsys_attribute *); |
1da177e4 | 270 | |
4d17ffda | 271 | #if defined(CONFIG_HOTPLUG) |
542cfce6 AK |
272 | int kobject_uevent(struct kobject *kobj, enum kobject_action action); |
273 | int kobject_uevent_env(struct kobject *kobj, enum kobject_action action, | |
8a82472f | 274 | char *envp[]); |
0296b228 | 275 | |
312c004d | 276 | int add_uevent_var(char **envp, int num_envp, int *cur_index, |
1da177e4 LT |
277 | char *buffer, int buffer_size, int *cur_len, |
278 | const char *format, ...) | |
279 | __attribute__((format (printf, 7, 8))); | |
280 | #else | |
542cfce6 AK |
281 | static inline int kobject_uevent(struct kobject *kobj, enum kobject_action action) |
282 | { return 0; } | |
283 | static inline int kobject_uevent_env(struct kobject *kobj, | |
8a82472f CH |
284 | enum kobject_action action, |
285 | char *envp[]) | |
542cfce6 | 286 | { return 0; } |
5f123fbd | 287 | |
312c004d | 288 | static inline int add_uevent_var(char **envp, int num_envp, int *cur_index, |
1da177e4 LT |
289 | char *buffer, int buffer_size, int *cur_len, |
290 | const char *format, ...) | |
291 | { return 0; } | |
292 | #endif | |
293 | ||
294 | #endif /* __KERNEL__ */ | |
295 | #endif /* _KOBJECT_H_ */ |