Use of kobject in Linux Device Model

To create a directory under the/sys/directory, You need to register a kobject structure with the kernel. This structure is a carrier of the directory. The attribute of this structure is saved by struct kobj_type. The method for registering kojbect is:/* initialize the kobject structure */void kobject_init (struct kobject * kobj ); /* register the kobject object to the Linux system */INT kobject_add (struct kobject * kobj); or combine the preceding two steps into one step: int kobject_init_and_add (struct kobject * kobj, struct kobj_type * ktypestruct kobject * parent, const char * FMT ,...); the file files and operations in the directory are defined in struct kobj_type: struct kobj_type {void (* release) (struct kobject * kobj); struct sysfs_ops * sysfs_ops; /* file operation */struct attribute ** default_attrs;/* file definition */}; File Operations: Struct sysfs_ops {ssize_t (* Show) (struct kobject * kobj, struct attribute * ATTR, char * buffer); ssize_t (* store) (struct kobject * kobj, struct attribute * ATTR, const char * buffer, size_t size) ;}; show: This function is called when the user reads the attribute file. This function saves the attribute value to the buffer and returns it to the user State. Store: when a user writes an attribute file, this function is called to store the attribute values passed by the user. File definition: The files in the directory are defined by the struct attribute ** default_attrs; array. The structure is as follows: struct attribute {char * Name;/* attribute file name */struct module * owner; mode_t mode; /* attribute protection space */};