source: GPL/trunk/include/linux/sysfs.h

#ifndef _LINUX_SYSFS_H
#define _LINUX_SYSFS_H
#include <linux/types.h>

int sysfs_emit(char *buf, const char *fmt, ...);
int sysfs_emit_at(char *buf, int at, const char *fmt, ...);

struct attribute {
        const char              *name;
        umode_t                 mode;
};

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

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

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

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

#endif /* _LINUX_SYSFS_H */