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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#ifdef CONFIG_UEVENT_HELPER
36/* path to the userspace helper executed on an event */
37extern char uevent_helper[];
38#endif
39
40/* counter to tag the uevent, read only except for the kobject core */
41extern u64 uevent_seqnum;
42
43/*
44 * The actions here must match the index to the string array
45 * in lib/kobject_uevent.c
46 *
47 * Do not add new actions here without checking with the driver-core
48 * maintainers. Action strings are not meant to express subsystem
49 * or device specific properties. In most cases you want to send a
50 * kobject_uevent_env(kobj, KOBJ_CHANGE, env) with additional event
51 * specific variables added to the event environment.
52 */
53enum kobject_action {
54 KOBJ_ADD,
55 KOBJ_REMOVE,
56 KOBJ_CHANGE,
57 KOBJ_MOVE,
58 KOBJ_ONLINE,
59 KOBJ_OFFLINE,
60 KOBJ_MAX
61};
62
63struct kobject {
64 const char *name;
65 struct list_head entry;
66 struct kobject *parent;
67 struct kset *kset;
68 struct kobj_type *ktype;
69 struct kernfs_node *sd; /* sysfs directory entry */
70 struct kref kref;
71#ifdef CONFIG_DEBUG_KOBJECT_RELEASE
72 struct delayed_work release;
73#endif
74 unsigned int state_initialized:1;
75 unsigned int state_in_sysfs:1;
76 unsigned int state_add_uevent_sent:1;
77 unsigned int state_remove_uevent_sent:1;
78 unsigned int uevent_suppress:1;
79};
80
81extern __printf(2, 3)
82int kobject_set_name(struct kobject *kobj, const char *name, ...);
83extern __printf(2, 0)
84int kobject_set_name_vargs(struct kobject *kobj, const char *fmt,
85 va_list vargs);
86
87static inline const char *kobject_name(const struct kobject *kobj)
88{
89 return kobj->name;
90}
91
92extern void kobject_init(struct kobject *kobj, struct kobj_type *ktype);
93extern __printf(3, 4) __must_check
94int kobject_add(struct kobject *kobj, struct kobject *parent,
95 const char *fmt, ...);
96extern __printf(4, 5) __must_check
97int kobject_init_and_add(struct kobject *kobj,
98 struct kobj_type *ktype, struct kobject *parent,
99 const char *fmt, ...);
100
101extern void kobject_del(struct kobject *kobj);
102
103extern struct kobject * __must_check kobject_create(void);
104extern struct kobject * __must_check kobject_create_and_add(const char *name,
105 struct kobject *parent);
106
107extern int __must_check kobject_rename(struct kobject *, const char *new_name);
108extern int __must_check kobject_move(struct kobject *, struct kobject *);
109
110extern struct kobject *kobject_get(struct kobject *kobj);
111extern struct kobject * __must_check kobject_get_unless_zero(
112 struct kobject *kobj);
113extern void kobject_put(struct kobject *kobj);
114
115extern const void *kobject_namespace(struct kobject *kobj);
116extern char *kobject_get_path(struct kobject *kobj, gfp_t flag);
117
118struct kobj_type {
119 void (*release)(struct kobject *kobj);
120 const struct sysfs_ops *sysfs_ops;
121 struct attribute **default_attrs;
122 const struct kobj_ns_type_operations *(*child_ns_type)(struct kobject *kobj);
123 const void *(*namespace)(struct kobject *kobj);
124};
125
126struct kobj_uevent_env {
127 char *argv[3];
128 char *envp[UEVENT_NUM_ENVP];
129 int envp_idx;
130 char buf[UEVENT_BUFFER_SIZE];
131 int buflen;
132};
133
134struct kset_uevent_ops {
135 int (* const filter)(struct kset *kset, struct kobject *kobj);
136 const char *(* const name)(struct kset *kset, struct kobject *kobj);
137 int (* const uevent)(struct kset *kset, struct kobject *kobj,
138 struct kobj_uevent_env *env);
139};
140
141struct kobj_attribute {
142 struct attribute attr;
143 ssize_t (*show)(struct kobject *kobj, struct kobj_attribute *attr,
144 char *buf);
145 ssize_t (*store)(struct kobject *kobj, struct kobj_attribute *attr,
146 const char *buf, size_t count);
147};
148
149extern const struct sysfs_ops kobj_sysfs_ops;
150
151struct sock;
152
153/**
154 * struct kset - a set of kobjects of a specific type, belonging to a specific subsystem.
155 *
156 * A kset defines a group of kobjects. They can be individually
157 * different "types" but overall these kobjects all want to be grouped
158 * together and operated on in the same manner. ksets are used to
159 * define the attribute callbacks and other common events that happen to
160 * a kobject.
161 *
162 * @list: the list of all kobjects for this kset
163 * @list_lock: a lock for iterating over the kobjects
164 * @kobj: the embedded kobject for this kset (recursion, isn't it fun...)
165 * @uevent_ops: the set of uevent operations for this kset. These are
166 * called whenever a kobject has something happen to it so that the kset
167 * can add new environment variables, or filter out the uevents if so
168 * desired.
169 */
170struct kset {
171 struct list_head list;
172 spinlock_t list_lock;
173 struct kobject kobj;
174 const struct kset_uevent_ops *uevent_ops;
175} __randomize_layout;
176
177extern void kset_init(struct kset *kset);
178extern int __must_check kset_register(struct kset *kset);
179extern void kset_unregister(struct kset *kset);
180extern struct kset * __must_check kset_create_and_add(const char *name,
181 const struct kset_uevent_ops *u,
182 struct kobject *parent_kobj);
183
184static inline struct kset *to_kset(struct kobject *kobj)
185{
186 return kobj ? container_of(kobj, struct kset, kobj) : NULL;
187}
188
189static inline struct kset *kset_get(struct kset *k)
190{
191 return k ? to_kset(kobject_get(&k->kobj)) : NULL;
192}
193
194static inline void kset_put(struct kset *k)
195{
196 kobject_put(&k->kobj);
197}
198
199static inline struct kobj_type *get_ktype(struct kobject *kobj)
200{
201 return kobj->ktype;
202}
203
204extern struct kobject *kset_find_obj(struct kset *, const char *);
205
206/* The global /sys/kernel/ kobject for people to chain off of */
207extern struct kobject *kernel_kobj;
208/* The global /sys/kernel/mm/ kobject for people to chain off of */
209extern struct kobject *mm_kobj;
210/* The global /sys/hypervisor/ kobject for people to chain off of */
211extern struct kobject *hypervisor_kobj;
212/* The global /sys/power/ kobject for people to chain off of */
213extern struct kobject *power_kobj;
214/* The global /sys/firmware/ kobject for people to chain off of */
215extern struct kobject *firmware_kobj;
216
217int kobject_uevent(struct kobject *kobj, enum kobject_action action);
218int kobject_uevent_env(struct kobject *kobj, enum kobject_action action,
219 char *envp[]);
220int kobject_synth_uevent(struct kobject *kobj, const char *buf, size_t count);
221
222__printf(2, 3)
223int add_uevent_var(struct kobj_uevent_env *env, const char *format, ...);
224
225#endif /* _KOBJECT_H_ */