1 头文件：
2 #include <linux/module.h>
3 #include <linux/kernel.h>
4 #include <linux/fs.h>
5 #include <linux/init.h>
6 #include <linux/delay.h>
7 #include <asm/uaccess.h>
8 #include <asm/irq.h>
9 #include <asm/io.h>
10 #include <asm/arch/regs-gpio.h>
11 #include <asm/hardware.h>
12
13 定义变量
14 int major;
15 static struct class *firstdrv_class;
16 static struct class_device *firstdrv_class_dev;
17
18
19
20
21 static int first_drv_open(struct inode *inode,struct file *file)
22 {
23
24
25 return 0;
26 }
27
28
29 static ssize_t first_drv_write(struct file *file,const char __user *buf,size_t count,loff_t *ppos)
30 {
31 printk("");
32 return 0;
33 }
34
35 static int first_drv_init(void)
36 {
37 major = register_chrdev(0,"first_drv",&first_drv_fops);
38 //告诉内核，并填充驱动，把数组填充进去。但是系统信息未生成
39
40 firstdrv_class = class_create(THIS_MODULE,"firstdrv");
41 //在sys下新建class，名叫firstdrv_class。
42
43 firstdrv_class_dev = class_device(firstdrv_class,NULL,MKDEV(major,0),NULL,"xyz");
44 //在此类下面新建设备节点，设备号为major，节点叫做xyz。(/dev/xyz)
45 }
46
47 在入口中新建，需要在出口中删除。
48 static void first_drv_exit(void)
49 {
50 unregister_chrdev(major,"first_drv");
51 class_device_unregister(firstdrv_class_dev);
52 class_destroy(firstdrv_class);
53 }
54
55 结尾：
56 module_init(first_drv_init);
57 module_exit(first_drv_exit);
58 module_license("GPL");
