开发笔记:第三方驱动移植——黑盒移植

1 #include
2 #include
3 #include
4 #include
5 #include
6
7 #define LED_MAGIC ‘L‘
8 #define LED_ON _IOW(LED_MAGIC, 1, int)
9 #define LED_OFF _IOW(LED_MAGIC, 2, int)
10
11 int main(int argc, char **argv)
12 {
13 int fd;
14
15 fd = open("/dev/led", O_RDWR);
16 if (fd <0) {
17 perror("open");
18 exit(1);
19 }
20
21 printf("open led ok
");
22
23 //实现LED灯闪烁
24 while(1)
25 {
26 ioctl(fd, LED_ON); //点亮灯
27 usleep(100000);
28 ioctl(fd, LED_OFF); //灭灯
29 usleep(100000);
30 }
31
32 return 0;
33 }

1 #include
2 #include
3 #include
4 #include
5 #include
6
7
8 #define LED_MAGIC ‘L‘
9 #define LED_ON _IOW(LED_MAGIC, 1, int)
10 #define LED_OFF _IOW(LED_MAGIC, 2, int)
11
12 #define LED_MA 501
13 #define LED_MI 0
14 #define LED_NUM 1
15
16 #define LED_CON 0x11000C20
17 #define LED_DAT 0x11000C24
18
19
20 struct cdev cdev;
21
22 unsigned int *ledcon;
23 unsigned int *leddat;
24
25 int led_open (struct inode *inode, struct file *file)
26 {
27 printk("led_open
");
28
29
30 ledcon = ioremap(LED_CON, 4);
31 if(ledcon == NULL) {
32 printk("ioremap LED_CON error
");
33 return -1;
34 }
35 writel(0x01, ledcon); //设置LED3 GPX1_0 为输出模式
36
37
38 leddat = ioremap(LED_DAT, 4);
39 if(leddat == NULL) {
40 printk("ioremap LED_DAT error
");
41 return -1;
42 }
43 writel(1, leddat); //设置LED3 GPX1_0 输出高电平
44
45 return 0;
46 }
47
48 int led_release(struct inode *inode, struct file *file)
49 {
50 printk("led_close
");
51 return 0;
52 }
53
54 long led_ioctl(struct file *file, unsigned int cmd, unsigned long args)
55 {
56 switch(cmd)
57 {
58 case LED_ON:
59 printk("led on ..
");
60 writel(1, leddat); //设置LED3 GPX1_0 输出高电平
61 break;
62 case LED_OFF:
63 printk("led off ..
");
64 writel(0, leddat); //设置LED3 GPX1_0 输出高电平
65 break;
66 default:
67 printk("no command
");
68 break;
69 }
70 return 0;
71 }
72
73
74 struct file_operations led_fops = { //文件操作
75 .owner = THIS_MODULE,
76 .open = led_open,
77 .release =led_release,
78 .unlocked_ioctl = led_ioctl,
79 };
80
81 static led_init(void)
82 {
83 int ret;
84 dev_t devno = MKDEV(LED_MA, LED_MI);
85 ret= register_chrdev_region(devno, LED_NUM, "newled"); //注册设备号
86 if(ret) {
87 printk("register_chrdev_region error
");
88 return -1;
89 }
90
91 cdev_init(&cdev, &led_fops); //初始化字符设备
92 ret = cdev_add(&cdev, devno, LED_NUM); //添加字符设备到系统中
93 if (ret <0) {
94 printk("cdev_add error
");
95 return -1;
96 }
97
98 printk("Led init 5
");
99 return 0;
100 }
101
102 static void led_exit(void)
103 {
104 dev_t devno = MKDEV(LED_MA, LED_MI);
105 cdev_del(&cdev);
106 unregister_chrdev_region(devno, LED_NUM); //取消注册
107 printk("Led exit
");
108 }
109
110 module_init(led_init);
111 module_exit(led_exit);
112 MODULE_LICENSE("Dual BSD/GPL");

1 ifeq ($(KERNELRELEASE),)
2 KERNELDIR ?= /home/linux/kernel/linux-3.14-fs4412
3 PWD := $(shell pwd)
4
5 all:
6 $(MAKE) -C $(KERNELDIR) M=$(PWD) modules
7
8 clean:
9 $(MAKE) -C $(KERNELDIR) M=$(PWD) clean
10 rm -rf a.out
11
12 else
13 obj-m := fs4412_led_drv.o
14 endif