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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/kernel.h>
26#include <linux/wait.h>
27#include <asm/atomic.h>
28
29#define UEVENT_HELPER_PATH_LEN 256
30#define UEVENT_NUM_ENVP 32 /* number of env pointers */
31#define UEVENT_BUFFER_SIZE 2048 /* buffer for the variables */
32
33/* path to the userspace helper executed on an event */
34extern char uevent_helper[];
35
36/* counter to tag the uevent, read only except for the kobject core */
37extern u64 uevent_seqnum;
38
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 */
49enum kobject_action {
50 KOBJ_ADD,
51 KOBJ_REMOVE,
52 KOBJ_CHANGE,
53 KOBJ_MOVE,
54 KOBJ_ONLINE,
55 KOBJ_OFFLINE,
56 KOBJ_MAX
57};
58
59struct kobject {
60 const char *name;
61 struct list_head entry;
62 struct kobject *parent;
63 struct kset *kset;
64 struct kobj_type *ktype;
65 struct sysfs_dirent *sd;
66 struct kref kref;
67 unsigned int state_initialized:1;
68 unsigned int state_in_sysfs:1;
69 unsigned int state_add_uevent_sent:1;
70 unsigned int state_remove_uevent_sent:1;
71};
72
73extern int kobject_set_name(struct kobject *kobj, const char *name, ...)
74 __attribute__((format(printf, 2, 3)));
75
76static inline const char *kobject_name(const struct kobject *kobj)
77{
78 return kobj->name;
79}
80
81extern void kobject_init(struct kobject *kobj, struct kobj_type *ktype);
82extern int __must_check kobject_add(struct kobject *kobj,
83 struct kobject *parent,
84 const char *fmt, ...);
85extern int __must_check kobject_init_and_add(struct kobject *kobj,
86 struct kobj_type *ktype,
87 struct kobject *parent,
88 const char *fmt, ...);
89
90extern void kobject_del(struct kobject *kobj);
91
92extern struct kobject * __must_check kobject_create(void);
93extern struct kobject * __must_check kobject_create_and_add(const char *name,
94 struct kobject *parent);
95
96extern int __must_check kobject_rename(struct kobject *, const char *new_name);
97extern int __must_check kobject_move(struct kobject *, struct kobject *);
98
99extern struct kobject *kobject_get(struct kobject *kobj);
100extern void kobject_put(struct kobject *kobj);
101
102extern char *kobject_get_path(struct kobject *kobj, gfp_t flag);
103
104struct kobj_type {
105 void (*release)(struct kobject *kobj);
106 struct sysfs_ops *sysfs_ops;
107 struct attribute **default_attrs;
108};
109
110struct kobj_uevent_env {
111 char *envp[UEVENT_NUM_ENVP];
112 int envp_idx;
113 char buf[UEVENT_BUFFER_SIZE];
114 int buflen;
115};
116
117struct kset_uevent_ops {
118 int (*filter)(struct kset *kset, struct kobject *kobj);
119 const char *(*name)(struct kset *kset, struct kobject *kobj);
120 int (*uevent)(struct kset *kset, struct kobject *kobj,
121 struct kobj_uevent_env *env);
122};
123
124struct 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
132extern struct sysfs_ops kobj_sysfs_ops;
133
134/**
135 * struct kset - a set of kobjects of a specific type, belonging to a specific subsystem.
136 *
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.
142 *
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.
150 */
151struct kset {
152 struct list_head list;
153 spinlock_t list_lock;
154 struct kobject kobj;
155 struct kset_uevent_ops *uevent_ops;
156};
157
158extern void kset_init(struct kset *kset);
159extern int __must_check kset_register(struct kset *kset);
160extern void kset_unregister(struct kset *kset);
161extern struct kset * __must_check kset_create_and_add(const char *name,
162 struct kset_uevent_ops *u,
163 struct kobject *parent_kobj);
164
165static inline struct kset *to_kset(struct kobject *kobj)
166{
167 return kobj ? container_of(kobj, struct kset, kobj) : NULL;
168}
169
170static inline struct kset *kset_get(struct kset *k)
171{
172 return k ? to_kset(kobject_get(&k->kobj)) : NULL;
173}
174
175static inline void kset_put(struct kset *k)
176{
177 kobject_put(&k->kobj);
178}
179
180static inline struct kobj_type *get_ktype(struct kobject *kobj)
181{
182 return kobj->ktype;
183}
184
185extern struct kobject *kset_find_obj(struct kset *, const char *);
186
187/* The global /sys/kernel/ kobject for people to chain off of */
188extern struct kobject *kernel_kobj;
189/* The global /sys/kernel/mm/ kobject for people to chain off of */
190extern struct kobject *mm_kobj;
191/* The global /sys/hypervisor/ kobject for people to chain off of */
192extern struct kobject *hypervisor_kobj;
193/* The global /sys/power/ kobject for people to chain off of */
194extern struct kobject *power_kobj;
195/* The global /sys/firmware/ kobject for people to chain off of */
196extern struct kobject *firmware_kobj;
197
198#if defined(CONFIG_HOTPLUG)
199int kobject_uevent(struct kobject *kobj, enum kobject_action action);
200int kobject_uevent_env(struct kobject *kobj, enum kobject_action action,
201 char *envp[]);
202
203int add_uevent_var(struct kobj_uevent_env *env, const char *format, ...)
204 __attribute__((format (printf, 2, 3)));
205
206int kobject_action_type(const char *buf, size_t count,
207 enum kobject_action *type);
208#else
209static inline int kobject_uevent(struct kobject *kobj,
210 enum kobject_action action)
211{ return 0; }
212static inline int kobject_uevent_env(struct kobject *kobj,
213 enum kobject_action action,
214 char *envp[])
215{ return 0; }
216
217static inline int add_uevent_var(struct kobj_uevent_env *env,
218 const char *format, ...)
219{ return 0; }
220
221static inline int kobject_action_type(const char *buf, size_t count,
222 enum kobject_action *type)
223{ return -EINVAL; }
224#endif
225
226#endif /* _KOBJECT_H_ */