1 files changed, 259 insertions, 0 deletions

diff --git a/include/linux/kobject.h b/include/linux/kobject.h
new file mode 100644
index 000000000000..765d660d3bea
--- /dev/null
+++ b/include/linux/kobject.h
@@ -0,0 +1,259 @@
+/*
+ * 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/spinlock.h>
+#include <linux/rwsem.h>
+#include <linux/kref.h>
+#include <linux/kobject_uevent.h>
+#include <linux/kernel.h>
+#include <asm/atomic.h>
+
+#define KOBJ_NAME_LEN   20
+
+/* counter to tag the hotplug event, read only except for the kobject core */
+extern u64 hotplug_seqnum;
+
+struct kobject {
+        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;
+};
+
+extern int kobject_set_name(struct kobject *, const char *, ...)
+        __attribute__((format(printf,2,3)));
+
+static inline char * kobject_name(struct kobject * kobj)
+{
+        return kobj->k_name;
+}
+
+extern void kobject_init(struct kobject *);
+extern void kobject_cleanup(struct kobject *);
+
+extern int kobject_add(struct kobject *);
+extern void kobject_del(struct kobject *);
+
+extern int kobject_rename(struct kobject *, char *new_name);
+
+extern int kobject_register(struct kobject *);
+extern void kobject_unregister(struct kobject *);
+
+extern struct kobject * kobject_get(struct kobject *);
+extern void kobject_put(struct kobject *);
+
+extern char * kobject_get_path(struct kobject *, int);
+
+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 hotplugging; if it does, it will be given
+ *      the opportunity to filter out specific kobjects from being
+ *      reported, as well as to add its own "data" elements to the
+ *      environment being passed to the hotplug helper.
+ */
+struct kset_hotplug_ops {
+        int (*filter)(struct kset *kset, struct kobject *kobj);
+        char *(*name)(struct kset *kset, struct kobject *kobj);
+        int (*hotplug)(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_hotplug_ops * hotplug_ops;
+};
+
+
+extern void kset_init(struct kset * k);
+extern int kset_add(struct kset * k);
+extern int 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,_hotplug_ops) \
+struct subsystem _name##_subsys = { \
+        .kset = { \
+                .kobj = { .name = __stringify(_name) }, \
+                .ktype = _type, \
+                .hotplug_ops =_hotplug_ops, \
+        } \
+}
+#define decl_subsys_name(_varname,_name,_type,_hotplug_ops) \
+struct subsystem _varname##_subsys = { \
+        .kset = { \
+                .kobj = { .name = __stringify(_name) }, \
+                .ktype = _type, \
+                .hotplug_ops =_hotplug_ops, \
+        } \
+}
+
+/* The global /sys/kernel/ subsystem for people to chain off of */
+extern struct subsystem kernel_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 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 subsys_create_file(struct subsystem * , struct subsys_attribute *);
+extern void subsys_remove_file(struct subsystem * , struct subsys_attribute *);
+
+#ifdef CONFIG_HOTPLUG
+void kobject_hotplug(struct kobject *kobj, enum kobject_action action);
+int add_hotplug_env_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 void kobject_hotplug(struct kobject *kobj, enum kobject_action action) { }
+static inline int add_hotplug_env_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_ */