| 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 */ |
| 37 | extern char uevent_helper[]; |
| 38 | #endif |
| 39 | |
| 40 | /* counter to tag the uevent, read only except for the kobject core */ |
| 41 | extern 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 | */ |
| 53 | enum 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 | |
| 63 | struct 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 | |
| 81 | extern __printf(2, 3) |
| 82 | int kobject_set_name(struct kobject *kobj, const char *name, ...); |
| 83 | extern __printf(2, 0) |
| 84 | int kobject_set_name_vargs(struct kobject *kobj, const char *fmt, |
| 85 | va_list vargs); |
| 86 | |
| 87 | static inline const char *kobject_name(const struct kobject *kobj) |
| 88 | { |
| 89 | return kobj->name; |
| 90 | } |
| 91 | |
| 92 | extern void kobject_init(struct kobject *kobj, struct kobj_type *ktype); |
| 93 | extern __printf(3, 4) __must_check |
| 94 | int kobject_add(struct kobject *kobj, struct kobject *parent, |
| 95 | const char *fmt, ...); |
| 96 | extern __printf(4, 5) __must_check |
| 97 | int kobject_init_and_add(struct kobject *kobj, |
| 98 | struct kobj_type *ktype, struct kobject *parent, |
| 99 | const char *fmt, ...); |
| 100 | |
| 101 | extern void kobject_del(struct kobject *kobj); |
| 102 | |
| 103 | extern struct kobject * __must_check kobject_create(void); |
| 104 | extern struct kobject * __must_check kobject_create_and_add(const char *name, |
| 105 | struct kobject *parent); |
| 106 | |
| 107 | extern int __must_check kobject_rename(struct kobject *, const char *new_name); |
| 108 | extern int __must_check kobject_move(struct kobject *, struct kobject *); |
| 109 | |
| 110 | extern struct kobject *kobject_get(struct kobject *kobj); |
| 111 | extern void kobject_put(struct kobject *kobj); |
| 112 | |
| 113 | extern const void *kobject_namespace(struct kobject *kobj); |
| 114 | extern char *kobject_get_path(struct kobject *kobj, gfp_t flag); |
| 115 | |
| 116 | struct kobj_type { |
| 117 | void (*release)(struct kobject *kobj); |
| 118 | const struct sysfs_ops *sysfs_ops; |
| 119 | struct attribute **default_attrs; |
| 120 | const struct kobj_ns_type_operations *(*child_ns_type)(struct kobject *kobj); |
| 121 | const void *(*namespace)(struct kobject *kobj); |
| 122 | }; |
| 123 | |
| 124 | struct kobj_uevent_env { |
| 125 | char *argv[3]; |
| 126 | char *envp[UEVENT_NUM_ENVP]; |
| 127 | int envp_idx; |
| 128 | char buf[UEVENT_BUFFER_SIZE]; |
| 129 | int buflen; |
| 130 | }; |
| 131 | |
| 132 | struct kset_uevent_ops { |
| 133 | int (* const filter)(struct kset *kset, struct kobject *kobj); |
| 134 | const char *(* const name)(struct kset *kset, struct kobject *kobj); |
| 135 | int (* const uevent)(struct kset *kset, struct kobject *kobj, |
| 136 | struct kobj_uevent_env *env); |
| 137 | }; |
| 138 | |
| 139 | struct kobj_attribute { |
| 140 | struct attribute attr; |
| 141 | ssize_t (*show)(struct kobject *kobj, struct kobj_attribute *attr, |
| 142 | char *buf); |
| 143 | ssize_t (*store)(struct kobject *kobj, struct kobj_attribute *attr, |
| 144 | const char *buf, size_t count); |
| 145 | }; |
| 146 | |
| 147 | extern const struct sysfs_ops kobj_sysfs_ops; |
| 148 | |
| 149 | struct sock; |
| 150 | |
| 151 | /** |
| 152 | * struct kset - a set of kobjects of a specific type, belonging to a specific subsystem. |
| 153 | * |
| 154 | * A kset defines a group of kobjects. They can be individually |
| 155 | * different "types" but overall these kobjects all want to be grouped |
| 156 | * together and operated on in the same manner. ksets are used to |
| 157 | * define the attribute callbacks and other common events that happen to |
| 158 | * a kobject. |
| 159 | * |
| 160 | * @list: the list of all kobjects for this kset |
| 161 | * @list_lock: a lock for iterating over the kobjects |
| 162 | * @kobj: the embedded kobject for this kset (recursion, isn't it fun...) |
| 163 | * @uevent_ops: the set of uevent operations for this kset. These are |
| 164 | * called whenever a kobject has something happen to it so that the kset |
| 165 | * can add new environment variables, or filter out the uevents if so |
| 166 | * desired. |
| 167 | */ |
| 168 | struct kset { |
| 169 | struct list_head list; |
| 170 | spinlock_t list_lock; |
| 171 | struct kobject kobj; |
| 172 | const struct kset_uevent_ops *uevent_ops; |
| 173 | }; |
| 174 | |
| 175 | extern void kset_init(struct kset *kset); |
| 176 | extern int __must_check kset_register(struct kset *kset); |
| 177 | extern void kset_unregister(struct kset *kset); |
| 178 | extern struct kset * __must_check kset_create_and_add(const char *name, |
| 179 | const struct kset_uevent_ops *u, |
| 180 | struct kobject *parent_kobj); |
| 181 | |
| 182 | static inline struct kset *to_kset(struct kobject *kobj) |
| 183 | { |
| 184 | return kobj ? container_of(kobj, struct kset, kobj) : NULL; |
| 185 | } |
| 186 | |
| 187 | static inline struct kset *kset_get(struct kset *k) |
| 188 | { |
| 189 | return k ? to_kset(kobject_get(&k->kobj)) : NULL; |
| 190 | } |
| 191 | |
| 192 | static inline void kset_put(struct kset *k) |
| 193 | { |
| 194 | kobject_put(&k->kobj); |
| 195 | } |
| 196 | |
| 197 | static inline struct kobj_type *get_ktype(struct kobject *kobj) |
| 198 | { |
| 199 | return kobj->ktype; |
| 200 | } |
| 201 | |
| 202 | extern struct kobject *kset_find_obj(struct kset *, const char *); |
| 203 | |
| 204 | /* The global /sys/kernel/ kobject for people to chain off of */ |
| 205 | extern struct kobject *kernel_kobj; |
| 206 | /* The global /sys/kernel/mm/ kobject for people to chain off of */ |
| 207 | extern struct kobject *mm_kobj; |
| 208 | /* The global /sys/hypervisor/ kobject for people to chain off of */ |
| 209 | extern struct kobject *hypervisor_kobj; |
| 210 | /* The global /sys/power/ kobject for people to chain off of */ |
| 211 | extern struct kobject *power_kobj; |
| 212 | /* The global /sys/firmware/ kobject for people to chain off of */ |
| 213 | extern struct kobject *firmware_kobj; |
| 214 | |
| 215 | int kobject_uevent(struct kobject *kobj, enum kobject_action action); |
| 216 | int kobject_uevent_env(struct kobject *kobj, enum kobject_action action, |
| 217 | char *envp[]); |
| 218 | |
| 219 | __printf(2, 3) |
| 220 | int add_uevent_var(struct kobj_uevent_env *env, const char *format, ...); |
| 221 | |
| 222 | int kobject_action_type(const char *buf, size_t count, |
| 223 | enum kobject_action *type); |
| 224 | |
| 225 | #endif /* _KOBJECT_H_ */ |