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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 * Copyright (c) 2006-2008 Greg Kroah-Hartman <greg@kroah.com>
7 * Copyright (c) 2006-2008 Novell Inc.
8 *
9 * This file is released under the GPLv2.
10 *
11 * Please read Documentation/kobject.txt before using the kobject
12 * interface, ESPECIALLY the parts about reference counts and object
13 * destructors.
14 */
15
16#ifndef _KOBJECT_H_
17#define _KOBJECT_H_
18
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/kobject_ns.h>
26#include <linux/kernel.h>
27#include <linux/wait.h>
28#include <linux/atomic.h>
29#include <linux/workqueue.h>
30
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 */
34
35/* path to the userspace helper executed on an event */
36extern char uevent_helper[];
37
38/* counter to tag the uevent, read only except for the kobject core */
39extern u64 uevent_seqnum;
40
41/*
42 * The actions here must match the index to the string array
43 * in lib/kobject_uevent.c
44 *
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.
50 */
51enum kobject_action {
52 KOBJ_ADD,
53 KOBJ_REMOVE,
54 KOBJ_CHANGE,
55 KOBJ_MOVE,
56 KOBJ_ONLINE,
57 KOBJ_OFFLINE,
58 KOBJ_MAX
59};
60
61struct kobject {
62 const char *name;
63 struct list_head entry;
64 struct kobject *parent;
65 struct kset *kset;
66 struct kobj_type *ktype;
67 struct kernfs_node *sd;
68 struct kref kref;
69#ifdef CONFIG_DEBUG_KOBJECT_RELEASE
70 struct delayed_work release;
71#endif
72 unsigned int state_initialized:1;
73 unsigned int state_in_sysfs:1;
74 unsigned int state_add_uevent_sent:1;
75 unsigned int state_remove_uevent_sent:1;
76 unsigned int uevent_suppress:1;
77};
78
79extern __printf(2, 3)
80int kobject_set_name(struct kobject *kobj, const char *name, ...);
81extern int kobject_set_name_vargs(struct kobject *kobj, const char *fmt,
82 va_list vargs);
83
84static inline const char *kobject_name(const struct kobject *kobj)
85{
86 return kobj->name;
87}
88
89extern void kobject_init(struct kobject *kobj, struct kobj_type *ktype);
90extern __printf(3, 4) __must_check
91int kobject_add(struct kobject *kobj, struct kobject *parent,
92 const char *fmt, ...);
93extern __printf(4, 5) __must_check
94int kobject_init_and_add(struct kobject *kobj,
95 struct kobj_type *ktype, struct kobject *parent,
96 const char *fmt, ...);
97
98extern void kobject_del(struct kobject *kobj);
99
100extern struct kobject * __must_check kobject_create(void);
101extern struct kobject * __must_check kobject_create_and_add(const char *name,
102 struct kobject *parent);
103
104extern int __must_check kobject_rename(struct kobject *, const char *new_name);
105extern int __must_check kobject_move(struct kobject *, struct kobject *);
106
107extern struct kobject *kobject_get(struct kobject *kobj);
108extern void kobject_put(struct kobject *kobj);
109
110extern const void *kobject_namespace(struct kobject *kobj);
111extern char *kobject_get_path(struct kobject *kobj, gfp_t flag);
112
113struct kobj_type {
114 void (*release)(struct kobject *kobj);
115 const struct sysfs_ops *sysfs_ops;
116 struct attribute **default_attrs;
117 const struct kobj_ns_type_operations *(*child_ns_type)(struct kobject *kobj);
118 const void *(*namespace)(struct kobject *kobj);
119};
120
121struct kobj_uevent_env {
122 char *argv[3];
123 char *envp[UEVENT_NUM_ENVP];
124 int envp_idx;
125 char buf[UEVENT_BUFFER_SIZE];
126 int buflen;
127};
128
129struct kset_uevent_ops {
130 int (* const filter)(struct kset *kset, struct kobject *kobj);
131 const char *(* const name)(struct kset *kset, struct kobject *kobj);
132 int (* const uevent)(struct kset *kset, struct kobject *kobj,
133 struct kobj_uevent_env *env);
134};
135
136struct kobj_attribute {
137 struct attribute attr;
138 ssize_t (*show)(struct kobject *kobj, struct kobj_attribute *attr,
139 char *buf);
140 ssize_t (*store)(struct kobject *kobj, struct kobj_attribute *attr,
141 const char *buf, size_t count);
142};
143
144extern const struct sysfs_ops kobj_sysfs_ops;
145
146struct sock;
147
148/**
149 * struct kset - a set of kobjects of a specific type, belonging to a specific subsystem.
150 *
151 * A kset defines a group of kobjects. They can be individually
152 * different "types" but overall these kobjects all want to be grouped
153 * together and operated on in the same manner. ksets are used to
154 * define the attribute callbacks and other common events that happen to
155 * a kobject.
156 *
157 * @list: the list of all kobjects for this kset
158 * @list_lock: a lock for iterating over the kobjects
159 * @kobj: the embedded kobject for this kset (recursion, isn't it fun...)
160 * @uevent_ops: the set of uevent operations for this kset. These are
161 * called whenever a kobject has something happen to it so that the kset
162 * can add new environment variables, or filter out the uevents if so
163 * desired.
164 */
165struct kset {
166 struct list_head list;
167 spinlock_t list_lock;
168 struct kobject kobj;
169 const struct kset_uevent_ops *uevent_ops;
170};
171
172extern void kset_init(struct kset *kset);
173extern int __must_check kset_register(struct kset *kset);
174extern void kset_unregister(struct kset *kset);
175extern struct kset * __must_check kset_create_and_add(const char *name,
176 const struct kset_uevent_ops *u,
177 struct kobject *parent_kobj);
178
179static inline struct kset *to_kset(struct kobject *kobj)
180{
181 return kobj ? container_of(kobj, struct kset, kobj) : NULL;
182}
183
184static inline struct kset *kset_get(struct kset *k)
185{
186 return k ? to_kset(kobject_get(&k->kobj)) : NULL;
187}
188
189static inline void kset_put(struct kset *k)
190{
191 kobject_put(&k->kobj);
192}
193
194static inline struct kobj_type *get_ktype(struct kobject *kobj)
195{
196 return kobj->ktype;
197}
198
199extern struct kobject *kset_find_obj(struct kset *, const char *);
200
201/* The global /sys/kernel/ kobject for people to chain off of */
202extern struct kobject *kernel_kobj;
203/* The global /sys/kernel/mm/ kobject for people to chain off of */
204extern struct kobject *mm_kobj;
205/* The global /sys/hypervisor/ kobject for people to chain off of */
206extern struct kobject *hypervisor_kobj;
207/* The global /sys/power/ kobject for people to chain off of */
208extern struct kobject *power_kobj;
209/* The global /sys/firmware/ kobject for people to chain off of */
210extern struct kobject *firmware_kobj;
211
212int kobject_uevent(struct kobject *kobj, enum kobject_action action);
213int kobject_uevent_env(struct kobject *kobj, enum kobject_action action,
214 char *envp[]);
215
216__printf(2, 3)
217int add_uevent_var(struct kobj_uevent_env *env, const char *format, ...);
218
219int kobject_action_type(const char *buf, size_t count,
220 enum kobject_action *type);
221
222#endif /* _KOBJECT_H_ */