Linux驅動:LED驅動測試

環境：

主機:Fedora 12

目標板：MINI6410

目標板LINUX內核版本：2.6.38

實現功能：

驅動目標板4個LED.

說明：

LED與6410引腳對應連接:

LED1---GPK4

LED2---GPK5

LED3---GPK6

LED4---GPK7

驅動源代碼：

led_driver.c:

1. #include <linux/miscdevice.h>
2. #include <linux/delay.h>
3. #include <asm/irq.h>
4. //#include <mach/regs-gpio.h>
5. #include <mach/hardware.h>
6. #include <linux/kernel.h>
7. #include <linux/module.h>
8. #include <linux/init.h>
9. #include <linux/mm.h>
10. #include <linux/fs.h>
11. #include <linux/types.h>
12. #include <linux/delay.h>
13. #include <linux/moduleparam.h>
14. #include <linux/slab.h>
15. #include <linux/errno.h>
16. #include <linux/ioctl.h>
17. #include <linux/cdev.h>
18. #include <linux/string.h>
19. #include <linux/list.h>
20. #include <linux/pci.h>
21. #include <asm/uaccess.h>
22. #include <asm/atomic.h>
23. #include <asm/unistd.h>
24. #include <linux/major.h>
26. #include <mach/map.h>
27. #include <mach/regs-clock.h>
28. #include <mach/regs-gpio.h>
30. #include <plat/gpio-cfg.h>
31. #include <mach/gpio-bank-e.h>
32. #include <mach/gpio-bank-k.h>
33. #include <mach/gpio-bank-h.h>
34. #include <mach/gpio-bank-n.h>
35. #include <mach/gpio-bank-l.h>
36. #include <mach/gpio-bank-p.h>
38. #include <linux/device.h>
40. #define DEVICE_NAME "led_driver"
41. #define T_MAJORS 700
43. static struct cdev fun_cdev;
44. static dev_t dev;
45. static struct class *led_class;
47. //功能：初始化IO
48. static void init_led(void)
49. {
50. unsigned temp;
52. //GPK4-7設置為輸出
53. temp = readl(S3C64XX_GPKCON);
54. temp &= ~((0xf << 4) | (0xf << 5) | (0xf << 6) | (0xf<< 7));
55. temp |= (1 << 16) | (1 << 20) | (1 << 24) | (1 << 28);
56. writel(temp, S3C64XX_GPKCON);
57. }
59. //功能：ioctl操作函數
60. //返回值：成功返回0
61. static long led_driver_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
62. {
63. unsigned int temp = 0;
65. printk (DEVICE_NAME"\tjdh:led_driver cmd=%d arg=%d\n",cmd,arg);
67. temp = readl(S3C64XX_GPKDAT);
68. if (cmd == 0)
69. {
70. temp &= ~(1 << (arg + 3));
71. }
72. else
73. {
74. temp |= 1 << (arg + 3);
75. }
76. writel(temp,S3C64XX_GPKDAT);
78. return 0;
79. }
81. static struct file_operations io_dev_fops = {
82. .owner = THIS_MODULE,
83. .unlocked_ioctl = led_driver_ioctl,
84. };
86. static int __init dev_init(void)
87. {
88. int ret;
89. unsigned temp;
91. init_led();
93. dev = MKDEV(T_MAJORS,0);
94. cdev_init(&fun_cdev,&io_dev_fops);
95. ret = register_chrdev_region(dev,1,DEVICE_NAME);
96. if (ret < 0) return 0;
97. ret = cdev_add(&fun_cdev,dev,1);
98. if (ret < 0) return 0;
100. printk (DEVICE_NAME"\tjdh:led_driver initialized!!\n");
102. led_class = class_create(THIS_MODULE, "led_class1");
103. if (IS_ERR(led_class))
104. {
105. printk(KERN_INFO "create class error\n");
106. return -1;
107. }
108. device_create(led_class, NULL, dev, NULL, "led_driver");
110. return ret;
111. }
113. static void __exit dev_exit(void)
114. {
115. unregister_chrdev_region(dev,1);
117. device_destroy(led_class, dev);
118. class_destroy(led_class);
119. }
121. module_init(dev_init);
122. module_exit(dev_exit);
123. MODULE_LICENSE("GPL");
124. MODULE_AUTHOR("JDH");