/*
 * 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 <asm/atomic.h>

struct kobject;
struct module;

/* FIXME
 * The *owner field is no longer used.
 * x86 tree has been cleaned up. The owner
 * attribute is still left for other arches.
 */
struct attribute {
        const char              *name;
        struct module           *owner;
        mode_t                  mode;
};

struct attribute_group {
        const char              *name;
        mode_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 } }

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

struct vm_area_struct;

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

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

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_chmod_file(struct kobject *kobj, struct attribute *attr,
                                  mode_t mode);
void sysfs_remove_file(struct kobject *kobj, const struct attribute *attr);

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

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 unsigned char *name);
struct sysfs_dirent *sysfs_get(struct sysfs_dirent *sd);
void sysfs_put(struct sysfs_dirent *sd);
void sysfs_printk_last_file(void);
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_chmod_file(struct kobject *kobj,
                                   struct attribute *attr, mode_t mode)
{
        return 0;
}

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

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

static inline void sysfs_remove_bin_file(struct kobject *kobj,
                                         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_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 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 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;
}

static inline void sysfs_printk_last_file(void)
{
}

#endif /* CONFIG_SYSFS */

#endif /* _SYSFS_H_ */