| /* |
| * kobject.h - generic kernel object infrastructure. |
| * |
| * Copyright (c) 2002-2003 Patrick Mochel |
| * Copyright (c) 2002-2003 Open Source Development Labs |
| * |
| * This file is released under the GPLv2. |
| * |
| * |
| * Please read Documentation/kobject.txt before using the kobject |
| * interface, ESPECIALLY the parts about reference counts and object |
| * destructors. |
| */ |
| |
| #ifndef _KOBJECT_H_ |
| #define _KOBJECT_H_ |
| |
| #ifdef __KERNEL__ |
| |
| #include <linux/types.h> |
| #include <linux/list.h> |
| #include <linux/sysfs.h> |
| #include <linux/compiler.h> |
| #include <linux/spinlock.h> |
| #include <linux/rwsem.h> |
| #include <linux/kref.h> |
| #include <linux/kernel.h> |
| #include <linux/wait.h> |
| #include <asm/atomic.h> |
| |
| #define KOBJ_NAME_LEN 20 |
| #define UEVENT_HELPER_PATH_LEN 256 |
| |
| /* path to the userspace helper executed on an event */ |
| extern char uevent_helper[]; |
| |
| /* counter to tag the uevent, read only except for the kobject core */ |
| extern u64 uevent_seqnum; |
| |
| /* the actions here must match the proper string in lib/kobject_uevent.c */ |
| typedef int __bitwise kobject_action_t; |
| enum kobject_action { |
| KOBJ_ADD = (__force kobject_action_t) 0x01, /* exclusive to core */ |
| KOBJ_REMOVE = (__force kobject_action_t) 0x02, /* exclusive to core */ |
| KOBJ_CHANGE = (__force kobject_action_t) 0x03, /* device state change */ |
| KOBJ_MOUNT = (__force kobject_action_t) 0x04, /* mount event for block devices (broken) */ |
| KOBJ_UMOUNT = (__force kobject_action_t) 0x05, /* umount event for block devices (broken) */ |
| KOBJ_OFFLINE = (__force kobject_action_t) 0x06, /* device offline */ |
| KOBJ_ONLINE = (__force kobject_action_t) 0x07, /* device online */ |
| KOBJ_MOVE = (__force kobject_action_t) 0x08, /* device move */ |
| }; |
| |
| struct kobject { |
| const char * k_name; |
| char name[KOBJ_NAME_LEN]; |
| struct kref kref; |
| struct list_head entry; |
| struct kobject * parent; |
| struct kset * kset; |
| struct kobj_type * ktype; |
| struct dentry * dentry; |
| wait_queue_head_t poll; |
| }; |
| |
| extern int kobject_set_name(struct kobject *, const char *, ...) |
| __attribute__((format(printf,2,3))); |
| |
| static inline const char * kobject_name(const struct kobject * kobj) |
| { |
| return kobj->k_name; |
| } |
| |
| extern void kobject_init(struct kobject *); |
| extern void kobject_cleanup(struct kobject *); |
| |
| extern int __must_check kobject_add(struct kobject *); |
| extern int __must_check kobject_shadow_add(struct kobject *, struct dentry *); |
| extern void kobject_del(struct kobject *); |
| |
| extern int __must_check kobject_rename(struct kobject *, const char *new_name); |
| extern int __must_check kobject_shadow_rename(struct kobject *kobj, |
| struct dentry *new_parent, |
| const char *new_name); |
| extern int __must_check kobject_move(struct kobject *, struct kobject *); |
| |
| extern int __must_check kobject_register(struct kobject *); |
| extern void kobject_unregister(struct kobject *); |
| |
| extern struct kobject * kobject_get(struct kobject *); |
| extern void kobject_put(struct kobject *); |
| |
| extern struct kobject *kobject_kset_add_dir(struct kset *kset, |
| struct kobject *, const char *); |
| extern struct kobject *kobject_add_dir(struct kobject *, const char *); |
| |
| extern char * kobject_get_path(struct kobject *, gfp_t); |
| |
| struct kobj_type { |
| void (*release)(struct kobject *); |
| struct sysfs_ops * sysfs_ops; |
| struct attribute ** default_attrs; |
| }; |
| |
| |
| /** |
| * kset - a set of kobjects of a specific type, belonging |
| * to a specific subsystem. |
| * |
| * All kobjects of a kset should be embedded in an identical |
| * type. This type may have a descriptor, which the kset points |
| * to. This allows there to exist sets of objects of the same |
| * type in different subsystems. |
| * |
| * A subsystem does not have to be a list of only one type |
| * of object; multiple ksets can belong to one subsystem. All |
| * ksets of a subsystem share the subsystem's lock. |
| * |
| * Each kset can support specific event variables; it can |
| * supress the event generation or add subsystem specific |
| * variables carried with the event. |
| */ |
| struct kset_uevent_ops { |
| int (*filter)(struct kset *kset, struct kobject *kobj); |
| const char *(*name)(struct kset *kset, struct kobject *kobj); |
| int (*uevent)(struct kset *kset, struct kobject *kobj, char **envp, |
| int num_envp, char *buffer, int buffer_size); |
| }; |
| |
| struct kset { |
| struct subsystem * subsys; |
| struct kobj_type * ktype; |
| struct list_head list; |
| spinlock_t list_lock; |
| struct kobject kobj; |
| struct kset_uevent_ops * uevent_ops; |
| }; |
| |
| |
| extern void kset_init(struct kset * k); |
| extern int __must_check kset_add(struct kset * k); |
| extern int __must_check kset_register(struct kset * k); |
| extern void kset_unregister(struct kset * k); |
| |
| static inline struct kset * to_kset(struct kobject * kobj) |
| { |
| return kobj ? container_of(kobj,struct kset,kobj) : NULL; |
| } |
| |
| static inline struct kset * kset_get(struct kset * k) |
| { |
| return k ? to_kset(kobject_get(&k->kobj)) : NULL; |
| } |
| |
| static inline void kset_put(struct kset * k) |
| { |
| kobject_put(&k->kobj); |
| } |
| |
| static inline struct kobj_type * get_ktype(struct kobject * k) |
| { |
| if (k->kset && k->kset->ktype) |
| return k->kset->ktype; |
| else |
| return k->ktype; |
| } |
| |
| extern struct kobject * kset_find_obj(struct kset *, const char *); |
| |
| |
| /** |
| * Use this when initializing an embedded kset with no other |
| * fields to initialize. |
| */ |
| #define set_kset_name(str) .kset = { .kobj = { .name = str } } |
| |
| |
| |
| struct subsystem { |
| struct kset kset; |
| struct rw_semaphore rwsem; |
| }; |
| |
| #define decl_subsys(_name,_type,_uevent_ops) \ |
| struct subsystem _name##_subsys = { \ |
| .kset = { \ |
| .kobj = { .name = __stringify(_name) }, \ |
| .ktype = _type, \ |
| .uevent_ops =_uevent_ops, \ |
| } \ |
| } |
| #define decl_subsys_name(_varname,_name,_type,_uevent_ops) \ |
| struct subsystem _varname##_subsys = { \ |
| .kset = { \ |
| .kobj = { .name = __stringify(_name) }, \ |
| .ktype = _type, \ |
| .uevent_ops =_uevent_ops, \ |
| } \ |
| } |
| |
| /* The global /sys/kernel/ subsystem for people to chain off of */ |
| extern struct subsystem kernel_subsys; |
| /* The global /sys/hypervisor/ subsystem */ |
| extern struct subsystem hypervisor_subsys; |
| |
| /** |
| * Helpers for setting the kset of registered objects. |
| * Often, a registered object belongs to a kset embedded in a |
| * subsystem. These do no magic, just make the resulting code |
| * easier to follow. |
| */ |
| |
| /** |
| * kobj_set_kset_s(obj,subsys) - set kset for embedded kobject. |
| * @obj: ptr to some object type. |
| * @subsys: a subsystem object (not a ptr). |
| * |
| * Can be used for any object type with an embedded ->kobj. |
| */ |
| |
| #define kobj_set_kset_s(obj,subsys) \ |
| (obj)->kobj.kset = &(subsys).kset |
| |
| /** |
| * kset_set_kset_s(obj,subsys) - set kset for embedded kset. |
| * @obj: ptr to some object type. |
| * @subsys: a subsystem object (not a ptr). |
| * |
| * Can be used for any object type with an embedded ->kset. |
| * Sets the kset of @obj's embedded kobject (via its embedded |
| * kset) to @subsys.kset. This makes @obj a member of that |
| * kset. |
| */ |
| |
| #define kset_set_kset_s(obj,subsys) \ |
| (obj)->kset.kobj.kset = &(subsys).kset |
| |
| /** |
| * subsys_set_kset(obj,subsys) - set kset for subsystem |
| * @obj: ptr to some object type. |
| * @subsys: a subsystem object (not a ptr). |
| * |
| * Can be used for any object type with an embedded ->subsys. |
| * Sets the kset of @obj's kobject to @subsys.kset. This makes |
| * the object a member of that kset. |
| */ |
| |
| #define subsys_set_kset(obj,_subsys) \ |
| (obj)->subsys.kset.kobj.kset = &(_subsys).kset |
| |
| extern void subsystem_init(struct subsystem *); |
| extern int __must_check subsystem_register(struct subsystem *); |
| extern void subsystem_unregister(struct subsystem *); |
| |
| static inline struct subsystem * subsys_get(struct subsystem * s) |
| { |
| return s ? container_of(kset_get(&s->kset),struct subsystem,kset) : NULL; |
| } |
| |
| static inline void subsys_put(struct subsystem * s) |
| { |
| kset_put(&s->kset); |
| } |
| |
| struct subsys_attribute { |
| struct attribute attr; |
| ssize_t (*show)(struct subsystem *, char *); |
| ssize_t (*store)(struct subsystem *, const char *, size_t); |
| }; |
| |
| extern int __must_check subsys_create_file(struct subsystem * , |
| struct subsys_attribute *); |
| |
| #if defined(CONFIG_HOTPLUG) |
| int kobject_uevent(struct kobject *kobj, enum kobject_action action); |
| int kobject_uevent_env(struct kobject *kobj, enum kobject_action action, |
| char *envp[]); |
| |
| int add_uevent_var(char **envp, int num_envp, int *cur_index, |
| char *buffer, int buffer_size, int *cur_len, |
| const char *format, ...) |
| __attribute__((format (printf, 7, 8))); |
| #else |
| static inline int kobject_uevent(struct kobject *kobj, enum kobject_action action) |
| { return 0; } |
| static inline int kobject_uevent_env(struct kobject *kobj, |
| enum kobject_action action, |
| char *envp[]) |
| { return 0; } |
| |
| static inline int add_uevent_var(char **envp, int num_envp, int *cur_index, |
| char *buffer, int buffer_size, int *cur_len, |
| const char *format, ...) |
| { return 0; } |
| #endif |
| |
| #endif /* __KERNEL__ */ |
| #endif /* _KOBJECT_H_ */ |