控制IO端口 s3c2410_gpio_setpin()的使用

Linux内核版本 2.6.28.7

arm-linux-gcc 3.4.1

1. #include
2. #include
3. #include
4. #include
5. #include
6. #includeinterrupt.h>/*设置中断方式*/
7. #include
8. #include
9. #include
10. #include
11. #include
12. //设备名
13. #defineIO_DEVICE_NAME"my_io"
14. //主设备号
15. #defineIO_DEVICE_MAJOR240
16. //次设备号
17. #defineIO_DEVICE_SECONDARY32
18. //返回一个数x的第y位
19. #defineMYBIT(x,y)((x>>y)%2)
20. #ifndef_LINUX_IRQRETURN_H
21. #define_LINUX_IRQRETURN_H
22. typedefintirqreturn_t;
23. #defineIRQ_EINT00
24. #defineIRQ_EINT22
25. #defineIRQ_EINT33
26. #defineIRQ_EINT432
27. #defineIRQ_NONE(0)
28. #defineIRQ_HANDLED(1)
29. #defineIRQ_RETVAL(x)((x)!=0)
30. #endif
31. /*
32. *S3C2410GPIOedgedetectionforIRQs:
33. *IRQsaregeneratedonFalling-Edge,Rising-Edge,both,lowlevelorhigglevel.
34. *Thismustbecalled*before*thecorrespondingIRQisregistered.
35. */
36. #defineEXT_LOWLEVEL0
37. #defineEXT_HIGHLEVEL1
38. #defineEXT_FALLING_EDGE2
39. #defineEXT_RISING_EDGE4
40. #defineEXT_BOTH_EDGES6
41. staticintflag_0,flag_2;//中断转换标志
42. staticintcnt;
43. DECLARE_WAIT_QUEUE_HEAD(io_wait);//声明等待队列
44. voidio_con_set();
45. staticirqreturn_tio_interrupt_0(intirq,void*dev_id,structpt_regs*regs)
46. {
47. printk("**********theinterrupt0works**********/n");
48. if(flag_0==0)
49. {
50. cnt=(cnt+1)%2;
51. flag_0=1;
52. if(cnt==0)
53. {
54. printk("IN/n");
55. s3c2410_gpio_setpin(S3C2410_GPB5,0);
56. s3c2410_gpio_setpin(S3C2410_GPB6,1);
57. }
58. wake_up_interruptible(&io_wait);
59. }
60. returnIRQ_HANDLED;
61. }
62. staticirqreturn_tio_interrupt_2(intirq,void*dev_id,structpt_regs*regs)
63. {
64. printk("**********theinterrupt2works**********/n");
65. if(flag_2==0)
66. {
67. cnt=(cnt+1)%2;
68. flag_2=1;
69. if(cnt==0)
70. {
71. printk("OUT/n");
72. s3c2410_gpio_setpin(S3C2410_GPB5,1);
73. s3c2410_gpio_setpin(S3C2410_GPB6,0);
74. }
75. wake_up_interruptible(&io_wait);
76. }
77. returnIRQ_HANDLED;
78. }
79. staticintio_open(structinode*inode,structfile*file)//打开设备函数
80. {
81. intret;
82. set_irq_type(IRQ_EINT0,EXT_FALLING_EDGE);//设置中断0触发方式
83. set_irq_type(IRQ_EINT2,EXT_FALLING_EDGE);//设置中断2触发方式
84. //EXT_LOWLEVEL
85. //EXT_HIGHLEVEL
86. //EXT_FALLING_EDGE
87. //EXT_RISING_EDGE
88. //EXT_BOTH_EDGES
89. disable_irq(IRQ_EINT0);
90. disable_irq(IRQ_EINT2);
91. enable_irq(IRQ_EINT0);
92. enable_irq(IRQ_EINT2);
93. ret=request_irq(IRQ_EINT0,io_interrupt_0,IRQF_SHARED,IO_DEVICE_NAME,1);//注册中断0
94. if(ret<0)
95. {
96. printk("IRQ%dcannotrequest/n",IRQ_EINT0);
97. returnret;
98. }
99. ret=request_irq(IRQ_EINT2,io_interrupt_2,IRQF_SHARED,IO_DEVICE_NAME,1);//注册中断2
100. if(ret<0)
101. {
102. printk("IRQ%dcannotrequest/n",IRQ_EINT2);
103. returnret;
104. }
105. printk("thedeviceisopened/n");
106. io_con_set();
107. cnt=0;
108. return0;
109. }
110. voidio_con_set()//IO端口控制寄存器初始化
111. {
112. s3c2410_gpio_cfgpin(S3C2410_GPF0,S3C2410_GPF0_EINT0);
113. s3c2410_gpio_cfgpin(S3C2410_GPF2,S3C2410_GPF2_EINT2);
114. s3c2410_gpio_cfgpin(S3C2410_GPB5,S3C2410_GPB5_OUTP);
115. s3c2410_gpio_cfgpin(S3C2410_GPB6,S3C2410_GPB6_OUTP);
116. }
117. staticintio_close(structinode*inode,structfile*file)//设备关闭函数
118. {
119. free_irq(IRQ_EINT0,1);//释放中断
120. free_irq(IRQ_EINT2,1);//释放中断
121. printk("thedeviceisclosed/n");
122. return0;
123. }
124. staticssize_tio_read(structfile*filp,char*buff,size_tcount,loff_t*f_ops)//读取IO端口
125. {
126. wait_event_interruptible(io_wait,flag_0);
127. wait_event_interruptible(io_wait,flag_0);
128. flag_0=0;
129. flag_2=0;
130. //printk("thevalueis%d/n",io_data);
131. copy_to_user(buff,(char*)&cnt,sizeof(cnt));
132. }
133. staticstructfile_operationsio_device_fops=
134. {
135. .owner=THIS_MODULE,
136. .read=io_read,
137. .open=io_open,
138. .release=io_close,
139. };
140. staticint__initio_init(void)//insmod加载驱动时执行
141. {
142. intret;
143. ret=register_chrdev(IO_DEVICE_MAJOR,IO_DEVICE_NAME,&io_device_fops);
144. if(ret<0)
145. {
146. printk("Failtoregistthedevice/n");
147. returnret;
148. }
149. return0;
150. }
151. staticint__exitio_exit(void)//rmmod卸载驱动时执行
152. {
153. unregister_chrdev(IO_DEVICE_MAJOR,IO_DEVICE_NAME);
154. printk("thedevicehasbeenunregisted/n");
155. }
156. module_init(io_init);
157. module_exit(io_exit);
158. MODULE_LICENSE("GPL");

Makefile同上一篇的Makefile

obj-m := my_io.o

KERNELDIR ?= /arm/linux-2.6.28.7-2440

PWD := $(shell pwd)

default:

$(MAKE) -C $(KERNELDIR) M=$(PWD)