linux下class简单使用实现

具体的实现可以参考linux内核的scsi硬盘里class类的实现，这里只是简单的使用实例

 

#include
#include
#include

MODULE_LICENSE("GPL");

 

static ssize_t example_show(struct class_device *cdev,char *buf)
{
 printk("==>%s\n",__FUNCTION__);
 return snprintf(buf,40,"%s\n","version 1.0");
}

 

static ssize_t example_store(struct device *cdev,char *buf)
{
 return 1;
}

static void example_release(struct class_device *cdev)
{
}

 

static struct class_device_attribute example_attr[] = {

 __ATTR(version,S_IRUGO|S_IWUSR,example_show,example_store),
 __ATTR_NULL,
};

 

static struct class example_class = {
 .name = "example",
 .owner = THIS_MODULE,
 .release = example_release,
 .class_dev_attrs = example_attr,
};

 

static int __init class_init(void)
{
 int err;
 
 err = class_register(&example_class);

 class_create_file(&example_class,&example_attr[0]); 
 
 return err;
}

static void __exit class_exit(void)
{
 class_remove_file(&example_class,&example_attr[0]);
 class_unregister(&example_class);
}

 

module_init(class_init);
module_exit(class_exit);