/*
 * sysfs.h - definitions for the device driver filesystem
 *
 * Copyright (c) 2001,2002 Patrick Mochel
 * Copyright (c) 2004 Silicon Graphics, Inc.
 * Copyright (c) 2007 SUSE Linux Products GmbH
 * Copyright (c) 2007 Tejun Heo <teheo@suse.de>
 *
 * Please see Documentation/filesystems/sysfs.txt for more information.
 */

#ifndef _SYSFS_H_
#define _SYSFS_H_

#include <linux/compiler.h>
#include <linux/errno.h>
#include <linux/list.h>
#include <linux/lockdep.h>
#include <linux/kobject_ns.h>
#include <linux/atomic.h>

struct kobject;
struct module;
enum kobj_ns_type;

struct attribute {
        const char              *name;
        umode_t                 mode;
#ifdef CONFIG_DEBUG_LOCK_ALLOC
        bool                    ignore_lockdep:1;
        struct lock_class_key   *key;
        struct lock_class_key   skey;
#endif
};

/**
 *      sysfs_attr_init - initialize a dynamically allocated sysfs attribute
 *      @attr: struct attribute to initialize
 *
 *      Initialize a dynamically allocated struct attribute so we can
 *      make lockdep happy.  This is a new requirement for attributes
 *      and initially this is only needed when lockdep is enabled.
 *      Lockdep gives a nice error when your attribute is added to
 *      sysfs if you don't have this.
 */
#ifdef CONFIG_DEBUG_LOCK_ALLOC
#define sysfs_attr_init(attr)                           \
do {                                                    \
        static struct lock_class_key __key;             \
                                                        \
        (attr)->key = &__key;                           \
} while(0)
#else
#define sysfs_attr_init(attr) do {} while(0)
#endif

struct attribute_group {
        const char              *name;
        umode_t                 (*is_visible)(struct kobject *,
                                              struct attribute *, int);
        struct attribute        **attrs;
};



/**
 * Use these macros to make defining attributes easier. See include/linux/device.h
 * for examples..
 */

#define __ATTR(_name,_mode,_show,_store) { \
        .attr = {.name = __stringify(_name), .mode = _mode },   \
        .show   = _show,                                        \
        .store  = _store,                                       \
}

#define __ATTR_RO(_name) { \
        .attr   = { .name = __stringify(_name), .mode = 0444 }, \
        .show   = _name##_show,                                 \
}

#define __ATTR_NULL { .attr = { .name = NULL } }

#ifdef CONFIG_DEBUG_LOCK_ALLOC
#define __ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store) {    \
        .attr = {.name = __stringify(_name), .mode = _mode,     \
                        .ignore_lockdep = true },               \
        .show           = _show,                                \
        .store          = _store,                               \
}
#else
#define __ATTR_IGNORE_LOCKDEP   __ATTR
#endif

#define attr_name(_attr) (_attr).attr.name

struct file;
struct vm_area_struct;

struct bin_attribute {
        struct attribute        attr;
        size_t                  size;
        void                    *private;
        ssize_t (*read)(struct file *, struct kobject *, struct bin_attribute *,
                        char *, loff_t, size_t);
        ssize_t (*write)(struct file *,struct kobject *, struct bin_attribute *,
                         char *, loff_t, size_t);
        int (*mmap)(struct file *, struct kobject *, struct bin_attribute *attr,
                    struct vm_area_struct *vma);
};

/**
 *      sysfs_bin_attr_init - initialize a dynamically allocated bin_attribute
 *      @attr: struct bin_attribute to initialize
 *
 *      Initialize a dynamically allocated struct bin_attribute so we
 *      can make lockdep happy.  This is a new requirement for
 *      attributes and initially this is only needed when lockdep is
 *      enabled.  Lockdep gives a nice error when your attribute is
 *      added to sysfs if you don't have this.
 */
#define sysfs_bin_attr_init(bin_attr) sysfs_attr_init(&(bin_attr)->attr)

struct sysfs_ops {
        ssize_t (*show)(struct kobject *, struct attribute *,char *);
        ssize_t (*store)(struct kobject *,struct attribute *,const char *, size_t);
        const void *(*namespace)(struct kobject *, const struct attribute *);
};

struct sysfs_dirent;

#ifdef CONFIG_SYSFS

int sysfs_schedule_callback(struct kobject *kobj, void (*func)(void *),
                            void *data, struct module *owner);

int __must_check sysfs_create_dir(struct kobject *kobj);
void sysfs_remove_dir(struct kobject *kobj);
int __must_check sysfs_rename_dir(struct kobject *kobj, const char *new_name);
int __must_check sysfs_move_dir(struct kobject *kobj,
                                struct kobject *new_parent_kobj);

int __must_check sysfs_create_file(struct kobject *kobj,
                                   const struct attribute *attr);
int __must_check sysfs_create_files(struct kobject *kobj,
                                   const struct attribute **attr);
int __must_check sysfs_chmod_file(struct kobject *kobj,
                                  const struct attribute *attr, umode_t mode);
void sysfs_remove_file(struct kobject *kobj, const struct attribute *attr);
void sysfs_remove_files(struct kobject *kobj, const struct attribute **attr);

int __must_check sysfs_create_bin_file(struct kobject *kobj,
                                       const struct bin_attribute *attr);
void sysfs_remove_bin_file(struct kobject *kobj,
                           const struct bin_attribute *attr);

int __must_check sysfs_create_link(struct kobject *kobj, struct kobject *target,
                                   const char *name);
int __must_check sysfs_create_link_nowarn(struct kobject *kobj,
                                          struct kobject *target,
                                          const char *name);
void sysfs_remove_link(struct kobject *kobj, const char *name);

int sysfs_rename_link(struct kobject *kobj, struct kobject *target,
                        const char *old_name, const char *new_name);

void sysfs_delete_link(struct kobject *dir, struct kobject *targ,
                        const char *name);

int __must_check sysfs_create_group(struct kobject *kobj,
                                    const struct attribute_group *grp);
int sysfs_update_group(struct kobject *kobj,
                       const struct attribute_group *grp);
void sysfs_remove_group(struct kobject *kobj,
                        const struct attribute_group *grp);
int sysfs_add_file_to_group(struct kobject *kobj,
                        const struct attribute *attr, const char *group);
void sysfs_remove_file_from_group(struct kobject *kobj,
                        const struct attribute *attr, const char *group);
int sysfs_merge_group(struct kobject *kobj,
                       const struct attribute_group *grp);
void sysfs_unmerge_group(struct kobject *kobj,
                       const struct attribute_group *grp);

void sysfs_notify(struct kobject *kobj, const char *dir, const char *attr);
void sysfs_notify_dirent(struct sysfs_dirent *sd);
struct sysfs_dirent *sysfs_get_dirent(struct sysfs_dirent *parent_sd,
                                      const void *ns,
                                      const unsigned char *name);
struct sysfs_dirent *sysfs_get(struct sysfs_dirent *sd);
void sysfs_put(struct sysfs_dirent *sd);

int __must_check sysfs_init(void);

#else /* CONFIG_SYSFS */

static inline int sysfs_schedule_callback(struct kobject *kobj,
                void (*func)(void *), void *data, struct module *owner)
{
        return -ENOSYS;
}

static inline int sysfs_create_dir(struct kobject *kobj)
{
        return 0;
}

static inline void sysfs_remove_dir(struct kobject *kobj)
{
}

static inline int sysfs_rename_dir(struct kobject *kobj, const char *new_name)
{
        return 0;
}

static inline int sysfs_move_dir(struct kobject *kobj,
                                 struct kobject *new_parent_kobj)
{
        return 0;
}

static inline int sysfs_create_file(struct kobject *kobj,
                                    const struct attribute *attr)
{
        return 0;
}

static inline int sysfs_create_files(struct kobject *kobj,
                                    const struct attribute **attr)
{
        return 0;
}

static inline int sysfs_chmod_file(struct kobject *kobj,
                                   const struct attribute *attr, umode_t mode)
{
        return 0;
}

static inline void sysfs_remove_file(struct kobject *kobj,
                                     const struct attribute *attr)
{
}

static inline void sysfs_remove_files(struct kobject *kobj,
                                     const struct attribute **attr)
{
}

static inline int sysfs_create_bin_file(struct kobject *kobj,
                                        const struct bin_attribute *attr)
{
        return 0;
}

static inline void sysfs_remove_bin_file(struct kobject *kobj,
                                         const struct bin_attribute *attr)
{
}

static inline int sysfs_create_link(struct kobject *kobj,
                                    struct kobject *target, const char *name)
{
        return 0;
}

static inline int sysfs_create_link_nowarn(struct kobject *kobj,
                                           struct kobject *target,
                                           const char *name)
{
        return 0;
}

static inline void sysfs_remove_link(struct kobject *kobj, const char *name)
{
}

static inline int sysfs_rename_link(struct kobject *k, struct kobject *t,
                                    const char *old_name, const char *new_name)
{
        return 0;
}

static inline void sysfs_delete_link(struct kobject *k, struct kobject *t,
                                     const char *name)
{
}

static inline int sysfs_create_group(struct kobject *kobj,
                                     const struct attribute_group *grp)
{
        return 0;
}

static inline int sysfs_update_group(struct kobject *kobj,
                                const struct attribute_group *grp)
{
        return 0;
}

static inline void sysfs_remove_group(struct kobject *kobj,
                                      const struct attribute_group *grp)
{
}

static inline int sysfs_add_file_to_group(struct kobject *kobj,
                const struct attribute *attr, const char *group)
{
        return 0;
}

static inline void sysfs_remove_file_from_group(struct kobject *kobj,
                const struct attribute *attr, const char *group)
{
}

static inline int sysfs_merge_group(struct kobject *kobj,
                       const struct attribute_group *grp)
{
        return 0;
}

static inline void sysfs_unmerge_group(struct kobject *kobj,
                       const struct attribute_group *grp)
{
}

static inline void sysfs_notify(struct kobject *kobj, const char *dir,
                                const char *attr)
{
}
static inline void sysfs_notify_dirent(struct sysfs_dirent *sd)
{
}
static inline
struct sysfs_dirent *sysfs_get_dirent(struct sysfs_dirent *parent_sd,
                                      const void *ns,
                                      const unsigned char *name)
{
        return NULL;
}
static inline struct sysfs_dirent *sysfs_get(struct sysfs_dirent *sd)
{
        return NULL;
}
static inline void sysfs_put(struct sysfs_dirent *sd)
{
}

static inline int __must_check sysfs_init(void)
{
        return 0;
}

#endif /* CONFIG_SYSFS */

#endif /* _SYSFS_H_ */