kobject,kset编程实例

#include <linux/device.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/string.h>
#include <linux/sysfs.h>
#include <linux/stat.h>

MODULE_AUTHOR("David Xie");
MODULE_LICENSE("Dual BSD/GPL");



/*声明release、show、store函数*/


void obj_test_release(struct kobject *kobject);
ssize_t kobj_test_show(struct kobject *kobject, struct attribute *attr,char *buf);
ssize_t kobj_test_store(struct kobject *kobject,struct attribute *attr,const char *buf, size_t count);

/*对应于kobject的目录下的一个文件,Name成员就是文件名*/
struct attribute test_attr = {
        .name = "kobj_config",
        .mode = S_IRWXUGO,
};

static struct attribute *def_attrs[] = {
        &test_attr,
        NULL,
};

//kobject对象的操作
struct sysfs_ops obj_test_sysops =
{
        .show = kobj_test_show,
        .store = kobj_test_store,
};

/*定义kobject对象的一些属性及对应的操作*/
struct kobj_type ktype =
{
        .release = obj_test_release,
        .sysfs_ops = &obj_test_sysops,
        .default_attrs = def_attrs,
};

/*release方法释放该kobject对象*/
void obj_test_release(struct kobject *kobject)
{
        printk("<0>""eric_test: release .\n");
}

/*当读文件时执行的操作*/
ssize_t kobj_test_show(struct kobject *kobject, struct attribute *attr,char *buf)
{
        printk("<0>""have show.\n");
        printk("<0>""attrname:%s.\n", attr->name);
        sprintf(buf,"%s\n",attr->name);
        return strlen(attr->name)+2;
}

/*当写文件时执行的操作*/
ssize_t kobj_test_store(struct kobject *kobject,struct attribute *attr,const char *buf, size_t count)
{
        printk("<0>""havestore\n");
        printk("<0>""write: %s\n",buf);
        return count;
}

struct kobject kobj;//声明kobject对象
struct kobject kobj_child;//声明kobject对象

/*
 struct kset_uevent_ops uevent_ops
 {

 }
*/
struct kset *hbx_kset = NULL;
struct kset *hbx_driver = NULL;

static int kobj_test_init(void)
{
        printk("<0>""kboject test init.\n");
        //kobject_init_and_add(&kobj,&ktype,NULL,"kobject_testd");//初始化kobject对象kobj,并将其注册到linux系统
        //kobject_init_and_add(&kobj_child,&ktype,&kobj,"kobject_test_child");//初始化kobject对象kobj,并将其注册到linux系统
        hbx_kset = kset_create_and_add("hbx", NULL, NULL);
        hbx_driver = kset_create_and_add("hbx_driver", NULL, &(hbx_kset->kobj));

        kobject_init_and_add(&kobj,&ktype,&(hbx_driver->kobj),"kobject_testd");//初始化kobject对象kobj,并将其注册到linux系统
        kobject_init_and_add(&kobj_child,&ktype,&kobj,"kobject_test_child");
        return 0;
}

static void kobj_test_exit(void)
{
        printk("<0>""kobject test exit.\n");
        kobject_del(&kobj);
        kset_unregister(hbx_driver);
        kset_unregister(hbx_kset);
}

module_init(kobj_test_init);

module_exit(kobj_test_exit);