mini2440上LEDS的驅動程序（含測試程序）

leds_drv.h

1. #ifndef _MEMDEV_H_
2. #define _MEMDEV_H_
3. #include <linux/ioctl.h>
4. /* 定義幻數 */
5. #define MEMDEV_IOC_MAGIC 'k'
6. /* 定義命令 */
7. #define MEMDEV_IOC_ON _IO(MEMDEV_IOC_MAGIC, 1)
8. #define MEMDEV_IOC_OFF _IO(MEMDEV_IOC_MAGIC, 2)
9. #define MEMDEV_IOC_MAXNR 2
10. #define LED_ON 0
11. #define LED_OFF 1
12. #endif /* _MEMDEV_H_ */

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/miscdevice.h>
8. #include <linux/delay.h>
9. #include <asm/irq.h>
10. #include <mach/regs-gpio.h>
11. #include <mach/hardware.h>
12. #include <linux/kernel.h>
13. #include <linux/module.h>
14. #include <linux/init.h>
15. #include <linux/mm.h>
16. #include <linux/fs.h>
17. #include <linux/types.h>
18. #include <linux/delay.h>
19. #include <linux/moduleparam.h>
20. #include <linux/slab.h>
21. #include <linux/errno.h>
22. #include <linux/ioctl.h>
23. #include <linux/cdev.h>
24. #include <linux/string.h>
25. #include <linux/list.h>
26. #include <linux/pci.h>
27. #include <linux/gpio.h>
28. #include <asm/uaccess.h>
29. #include <asm/atomic.h>
30. #include <asm/unistd.h>
32. #include "leds_drv.h"
34. #define DEVICE_NAME "leds"
36. static unsigned long led_table[] = {
37. S3C2410_GPB(5),
38. S3C2410_GPB(6),
39. S3C2410_GPB(7),
40. S3C2410_GPB(8),
41. };
43. static unsigned int led_cfg_table[] = {
44. S3C2410_GPIO_OUTPUT,
45. S3C2410_GPIO_OUTPUT,
46. S3C2410_GPIO_OUTPUT,
47. S3C2410_GPIO_OUTPUT,
48. };
50. static int s3c2440_leds_ioctl(struct inode *inode,
51. struct file *file, unsigned int cmd, unsigned long arg)
52. {
54. /* 檢測命令的有效性 */
55. if (_IOC_TYPE(cmd) != MEMDEV_IOC_MAGIC)
56. return -EINVAL;
57. if (_IOC_NR(cmd) > MEMDEV_IOC_MAXNR)
58. return -EINVAL;
60. /* 根據命令，執行相應的操作 */
61. switch (cmd)
62. {
63. case MEMDEV_IOC_OFF:
64. s3c2410_gpio_setpin(led_table[arg], LED_OFF);
65. return 0;
67. case MEMDEV_IOC_ON:
68. s3c2410_gpio_setpin(led_table[arg], LED_ON);
69. return 0;
70. default:
71. return -EINVAL;
72. }
73. }
75. /*文件操作結構體*/
76. static struct file_operations dev_fops = {
77. .owner = THIS_MODULE,
78. .ioctl = s3c2440_leds_ioctl,
79. };
81. static struct miscdevice misc = {
82. .minor = MISC_DYNAMIC_MINOR,
83. .name = DEVICE_NAME,
84. .fops = &dev_fops,
85. };
87. static int __init dev_init(void)
88. {
89. int ret;
91. int i;
92. /*設置GPIO控制寄存器，GPIO設置為輸出模式,默認下燈全滅 */
93. for (i = 0; i < 4; i++)
94. {
95. s3c2410_gpio_cfgpin(led_table[i], led_cfg_table[i]);
96. s3c2410_gpio_setpin(led_table[i], 1);
97. }
98. /*注冊混雜型字符設備驅動 */
99. ret = misc_register(&misc);
101. printk(DEVICE_NAME "\tinitialized\n");
103. return ret;
104. }
106. static void __exit dev_exit(void)
107. {
108. /*注銷混雜型字符設備驅動 */
109. misc_deregister(&misc);
110. }
112. module_init(dev_init);
113. module_exit(dev_exit);
115. MODULE_AUTHOR("Cried Devil");
116. MODULE_LICENSE("GPL");