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1da177e4 LT |
1 | /* |
2 | * kobject.h - generic kernel object infrastructure. | |
3 | * | |
f0e7e1bd GKH |
4 | * Copyright (c) 2002-2003 Patrick Mochel |
5 | * Copyright (c) 2002-2003 Open Source Development Labs | |
79a6ee42 GKH |
6 | * Copyright (c) 2006-2008 Greg Kroah-Hartman <greg@kroah.com> |
7 | * Copyright (c) 2006-2008 Novell Inc. | |
1da177e4 LT |
8 | * |
9 | * This file is released under the GPLv2. | |
10 | * | |
1da177e4 LT |
11 | * Please read Documentation/kobject.txt before using the kobject |
12 | * interface, ESPECIALLY the parts about reference counts and object | |
79a6ee42 | 13 | * destructors. |
1da177e4 LT |
14 | */ |
15 | ||
16 | #ifndef _KOBJECT_H_ | |
17 | #define _KOBJECT_H_ | |
18 | ||
1da177e4 LT |
19 | #include <linux/types.h> |
20 | #include <linux/list.h> | |
21 | #include <linux/sysfs.h> | |
4a7fb636 | 22 | #include <linux/compiler.h> |
1da177e4 | 23 | #include <linux/spinlock.h> |
1da177e4 | 24 | #include <linux/kref.h> |
1da177e4 | 25 | #include <linux/kernel.h> |
4508a7a7 | 26 | #include <linux/wait.h> |
1da177e4 LT |
27 | #include <asm/atomic.h> |
28 | ||
312c004d | 29 | #define UEVENT_HELPER_PATH_LEN 256 |
7eff2e7a KS |
30 | #define UEVENT_NUM_ENVP 32 /* number of env pointers */ |
31 | #define UEVENT_BUFFER_SIZE 2048 /* buffer for the variables */ | |
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 { |
af5ca3f4 | 60 | const char *name; |
1da177e4 | 61 | struct list_head entry; |
79a6ee42 GKH |
62 | struct kobject *parent; |
63 | struct kset *kset; | |
64 | struct kobj_type *ktype; | |
65 | struct sysfs_dirent *sd; | |
a231934b | 66 | struct kref kref; |
0f4dafc0 | 67 | unsigned int state_initialized:1; |
0f4dafc0 KS |
68 | unsigned int state_in_sysfs:1; |
69 | unsigned int state_add_uevent_sent:1; | |
70 | unsigned int state_remove_uevent_sent:1; | |
1da177e4 LT |
71 | }; |
72 | ||
79a6ee42 GKH |
73 | extern int kobject_set_name(struct kobject *kobj, const char *name, ...) |
74 | __attribute__((format(printf, 2, 3))); | |
1da177e4 | 75 | |
79a6ee42 | 76 | static inline const char *kobject_name(const struct kobject *kobj) |
1da177e4 | 77 | { |
af5ca3f4 | 78 | return kobj->name; |
1da177e4 LT |
79 | } |
80 | ||
f9cb074b | 81 | extern void kobject_init(struct kobject *kobj, struct kobj_type *ktype); |
b2d6db58 GKH |
82 | extern int __must_check kobject_add(struct kobject *kobj, |
83 | struct kobject *parent, | |
84 | const char *fmt, ...); | |
c11c4154 GKH |
85 | extern int __must_check kobject_init_and_add(struct kobject *kobj, |
86 | struct kobj_type *ktype, | |
87 | struct kobject *parent, | |
88 | const char *fmt, ...); | |
89 | ||
79a6ee42 | 90 | extern void kobject_del(struct kobject *kobj); |
1da177e4 | 91 | |
43968d2f | 92 | extern struct kobject * __must_check kobject_create(void); |
3f9e3ee9 GKH |
93 | extern struct kobject * __must_check kobject_create_and_add(const char *name, |
94 | struct kobject *parent); | |
95 | ||
4a7fb636 | 96 | extern int __must_check kobject_rename(struct kobject *, const char *new_name); |
8a82472f | 97 | extern int __must_check kobject_move(struct kobject *, struct kobject *); |
1da177e4 | 98 | |
79a6ee42 GKH |
99 | extern struct kobject *kobject_get(struct kobject *kobj); |
100 | extern void kobject_put(struct kobject *kobj); | |
1da177e4 | 101 | |
79a6ee42 | 102 | extern char *kobject_get_path(struct kobject *kobj, gfp_t flag); |
1da177e4 LT |
103 | |
104 | struct kobj_type { | |
79a6ee42 GKH |
105 | void (*release)(struct kobject *kobj); |
106 | struct sysfs_ops *sysfs_ops; | |
107 | struct attribute **default_attrs; | |
1da177e4 LT |
108 | }; |
109 | ||
7eff2e7a KS |
110 | struct kobj_uevent_env { |
111 | char *envp[UEVENT_NUM_ENVP]; | |
112 | int envp_idx; | |
113 | char buf[UEVENT_BUFFER_SIZE]; | |
114 | int buflen; | |
115 | }; | |
116 | ||
a5615648 RD |
117 | struct kset_uevent_ops { |
118 | int (*filter)(struct kset *kset, struct kobject *kobj); | |
119 | const char *(*name)(struct kset *kset, struct kobject *kobj); | |
7eff2e7a KS |
120 | int (*uevent)(struct kset *kset, struct kobject *kobj, |
121 | struct kobj_uevent_env *env); | |
a5615648 | 122 | }; |
1da177e4 | 123 | |
23b5212c KS |
124 | struct kobj_attribute { |
125 | struct attribute attr; | |
126 | ssize_t (*show)(struct kobject *kobj, struct kobj_attribute *attr, | |
127 | char *buf); | |
128 | ssize_t (*store)(struct kobject *kobj, struct kobj_attribute *attr, | |
129 | const char *buf, size_t count); | |
130 | }; | |
131 | ||
132 | extern struct sysfs_ops kobj_sysfs_ops; | |
133 | ||
6adf7554 GKH |
134 | /** |
135 | * struct kset - a set of kobjects of a specific type, belonging to a specific subsystem. | |
1da177e4 | 136 | * |
6adf7554 GKH |
137 | * A kset defines a group of kobjects. They can be individually |
138 | * different "types" but overall these kobjects all want to be grouped | |
139 | * together and operated on in the same manner. ksets are used to | |
140 | * define the attribute callbacks and other common events that happen to | |
141 | * a kobject. | |
1da177e4 | 142 | * |
6adf7554 GKH |
143 | * @list: the list of all kobjects for this kset |
144 | * @list_lock: a lock for iterating over the kobjects | |
145 | * @kobj: the embedded kobject for this kset (recursion, isn't it fun...) | |
146 | * @uevent_ops: the set of uevent operations for this kset. These are | |
147 | * called whenever a kobject has something happen to it so that the kset | |
148 | * can add new environment variables, or filter out the uevents if so | |
149 | * desired. | |
1da177e4 | 150 | */ |
1da177e4 | 151 | struct kset { |
79a6ee42 GKH |
152 | struct list_head list; |
153 | spinlock_t list_lock; | |
154 | struct kobject kobj; | |
155 | struct kset_uevent_ops *uevent_ops; | |
1da177e4 LT |
156 | }; |
157 | ||
79a6ee42 GKH |
158 | extern void kset_init(struct kset *kset); |
159 | extern int __must_check kset_register(struct kset *kset); | |
160 | extern void kset_unregister(struct kset *kset); | |
b727c702 GKH |
161 | extern struct kset * __must_check kset_create_and_add(const char *name, |
162 | struct kset_uevent_ops *u, | |
163 | struct kobject *parent_kobj); | |
1da177e4 | 164 | |
79a6ee42 | 165 | static inline struct kset *to_kset(struct kobject *kobj) |
1da177e4 | 166 | { |
79a6ee42 | 167 | return kobj ? container_of(kobj, struct kset, kobj) : NULL; |
1da177e4 LT |
168 | } |
169 | ||
79a6ee42 | 170 | static inline struct kset *kset_get(struct kset *k) |
1da177e4 LT |
171 | { |
172 | return k ? to_kset(kobject_get(&k->kobj)) : NULL; | |
173 | } | |
174 | ||
79a6ee42 | 175 | static inline void kset_put(struct kset *k) |
1da177e4 LT |
176 | { |
177 | kobject_put(&k->kobj); | |
178 | } | |
179 | ||
3514faca | 180 | static inline struct kobj_type *get_ktype(struct kobject *kobj) |
1da177e4 | 181 | { |
3514faca | 182 | return kobj->ktype; |
1da177e4 LT |
183 | } |
184 | ||
79a6ee42 | 185 | extern struct kobject *kset_find_obj(struct kset *, const char *); |
1da177e4 | 186 | |
0ff21e46 GKH |
187 | /* The global /sys/kernel/ kobject for people to chain off of */ |
188 | extern struct kobject *kernel_kobj; | |
ff7ea79c NA |
189 | /* The global /sys/kernel/mm/ kobject for people to chain off of */ |
190 | extern struct kobject *mm_kobj; | |
2d72fc00 GKH |
191 | /* The global /sys/hypervisor/ kobject for people to chain off of */ |
192 | extern struct kobject *hypervisor_kobj; | |
d76e15fb GKH |
193 | /* The global /sys/power/ kobject for people to chain off of */ |
194 | extern struct kobject *power_kobj; | |
f62ed9e3 GKH |
195 | /* The global /sys/firmware/ kobject for people to chain off of */ |
196 | extern struct kobject *firmware_kobj; | |
1da177e4 | 197 | |
4d17ffda | 198 | #if defined(CONFIG_HOTPLUG) |
542cfce6 AK |
199 | int kobject_uevent(struct kobject *kobj, enum kobject_action action); |
200 | int kobject_uevent_env(struct kobject *kobj, enum kobject_action action, | |
8a82472f | 201 | char *envp[]); |
0296b228 | 202 | |
7eff2e7a KS |
203 | int add_uevent_var(struct kobj_uevent_env *env, const char *format, ...) |
204 | __attribute__((format (printf, 2, 3))); | |
5c5daf65 KS |
205 | |
206 | int kobject_action_type(const char *buf, size_t count, | |
207 | enum kobject_action *type); | |
1da177e4 | 208 | #else |
79a6ee42 GKH |
209 | static inline int kobject_uevent(struct kobject *kobj, |
210 | enum kobject_action action) | |
542cfce6 AK |
211 | { return 0; } |
212 | static inline int kobject_uevent_env(struct kobject *kobj, | |
8a82472f CH |
213 | enum kobject_action action, |
214 | char *envp[]) | |
542cfce6 | 215 | { return 0; } |
5f123fbd | 216 | |
79a6ee42 GKH |
217 | static inline int add_uevent_var(struct kobj_uevent_env *env, |
218 | const char *format, ...) | |
1da177e4 | 219 | { return 0; } |
5c5daf65 KS |
220 | |
221 | static inline int kobject_action_type(const char *buf, size_t count, | |
79a6ee42 | 222 | enum kobject_action *type) |
5c5daf65 | 223 | { return -EINVAL; } |
1da177e4 LT |
224 | #endif |
225 | ||
1da177e4 | 226 | #endif /* _KOBJECT_H_ */ |