sysfs文件之attribute file

RW.c:

#include linux/module.h
#include linux/init.h
#include linux/kobject.h
#include linux/kernel.h

#include "RW.h"

static struct kobject *devicesSY_kobj;

static struct kobject *kobj;

struct textattribute testattr = {
 .attr = {
   .name = "test_attr",
   .mode = 0777,
    },
 .str = "test_attr_str",
};

static ssize_t devicesSY_attr_show(struct kobject *kobj, struct attribute *attr,char *buf)
{
 struct textattribute * test;

 test = container_of(attr, struct textattribute, attr);
 printk("test file str = %s\n",test->str);
 printk("test file attr name = %s\n",test->attr.name);
}

static ssize_t devicesSY_attr_store(struct kobject *kobj, struct attribute *attr,const char *buf, size_t count)
{

}

static const struct sysfs_ops devicesSY_sysfs_ops = {
 .show   = devicesSY_attr_show,
 .store   = devicesSY_attr_store,
};

int devicesSY_register(void)
{
 
 kobj = kobject_create_and_add("test", devicesSY_kobj);
 kobj->ktype->sysfs_ops = &devicesSY_sysfs_ops;
 sysfs_create_file(kobj,&(testattr.attr));

 return 0;
}

static int devicesSY_init(void)
{
 devicesSY_kobj = kobject_create_and_add("devicesSY",NULL);
 if (!devicesSY_kobj)
  return -ENOMEM;
 devicesSY_register();
 return 0;
}

static void devicesSY_exit(void)
{
 kobject_put(devicesSY_kobj);
 kobject_put(kobj);
}

MODULE_AUTHOR("devicesSY");
MODULE_LICENSE("GPL");

module_init(devicesSY_init);
module_exit(devicesSY_exit);

RC.h:

#ifndef _RW_H_
#define _RW_H_

#include

struct textattribute{
 struct attribute  attr;
 char * str;
};

#endif