Linux2.6内核下键盘输入设备驱动的实现.doc

Linux2.6内核下键盘输入设备驱动的实现分类：linux设备驱动2011-02-08 00:472600人阅读评论(0)收藏举报linuxkeyboardinputactionreportrandom实验环境：1）Ubuntu9.10 OS 2）arm-linux-gcc 4.3.2交叉编译器 3）勤研S3C2440开发板(Linux2.6.29内核)实现的功能：键盘驱动通过input子系统将按键事件上报给上层的应用程序，应用程序将相应的按键事件打印出来关于input子系统的相关知识可以参考博文Linux设备模型之input子系统详解/u1/51562/showart_1090628.html废话不多说，附上源码：1) s3c2440键盘驱动源代码，参考2.6.29内核中触摸屏驱动s3c2410_ts.c实现c-sharpview plaincopy1. /*2. *Copyright(c)2011ShenYunlong3. *4. *5. *Thisprogramisfreesoftware;youcanredistributeitand/ormodifyit6. *underthetermsoftheGNUGeneralPublicLicenseversion2aspublishedby7. *theFreeSoftwareFoundation.8. */9. #include10. #include11. #include12. #include13. #include14. #include15. #include16. #include17. #include18. #include19. #include20. #include21. MODULE_LICENSE(GPL);22. MODULE_AUTHOR(SYL_USST);23. staticstructinput_dev*dev;24. staticchar*s3c2440_keyboard_name=s3c2440_keyboard_syl;25. /*26. *SetGPF0,GPF1,GPF2,GPF3portsusedasEINT0,EINT1,EINT2,EINT327. *SetGPG0,GPG1usedasEINT8,EINT928. */29. staticinlinevoids3c2440_keyboard_connect(void)30. 31. s3c2410_gpio_cfgpin(S3C2410_GPF0,S3C2410_GPF0_EINT0);32. s3c2410_gpio_cfgpin(S3C2410_GPF1,S3C2410_GPF1_EINT1);33. s3c2410_gpio_cfgpin(S3C2410_GPF2,S3C2410_GPF2_EINT2);34. s3c2410_gpio_cfgpin(S3C2410_GPF3,S3C2410_GPF3_EINT3);35. s3c2410_gpio_cfgpin(S3C2410_GPG0,S3C2410_GPG0_EINT8);36. s3c2410_gpio_cfgpin(S3C2410_GPG1,S3C2410_GPG1_EINT9);37. 38. /*39. *InterruptHandlersofEINT0EINT3&EINT8&EINT940. *41. *Note:oncetheISRhasreportedakeywithaspecifiedvalue,42. *thenthenexttimeit(thekeywiththesamevalue)willbefiltered.43. *Itmeansthattheprograminuser-spacecannotgettheinput_eventfromthekernel.44. */45. staticirqreturn_tkeyboard_sw1_action(intirq,void*dev_id)46. 47. /printk(KERN_INFOsw1ispressed!/n);48. unsignedintupdown=ioread32(S3C2410_GPFDAT)&0x1;49. if(updown)50. /*thekeyBTN_0israised*/51. input_report_key(dev,BTN_0,0);52. else53. /*thekeyBTN_0ispressed*/54. input_report_key(dev,BTN_0,1);55. input_sync(dev);56. 57. returnIRQ_HANDLED;58. 59. staticirqreturn_tkeyboard_sw2_action(intirq,void*dev_id)60. 61. /printk(KERN_INFOsw2ispressed!/n);62. unsignedintupdown=ioread32(S3C2410_GPFDAT)&(0x11);63. if(updown)64. input_report_key(dev,BTN_1,0);65. else66. input_report_key(dev,BTN_1,1);67. input_sync(dev);68. returnIRQ_HANDLED;69. 70. staticirqreturn_tkeyboard_up_action(intirq,void*dev_id)71. 72. /printk(KERN_INFOupispressed!/n);73. unsignedintupdown=ioread32(S3C2410_GPFDAT)&(0x12);74. if(updown)75. input_report_key(dev,BTN_2,0);76. else77. input_report_key(dev,BTN_2,1);78. input_sync(dev);79. returnIRQ_HANDLED;80. 81. staticirqreturn_tkeyboard_down_action(intirq,void*dev_id)82. 83. /printk(KERN_INFOdownispressed!/n);84. unsignedintupdown=ioread32(S3C2410_GPFDAT)&(0x13);85. 86. if(updown)87. input_report_key(dev,BTN_3,0);88. else89. input_report_key(dev,BTN_3,1);90. input_sync(dev);91. returnIRQ_HANDLED;92. 93. staticirqreturn_tkeyboard_left_action(intirq,void*dev_id)94. 95. /printk(KERN_INFOleftispressed!/n);96. unsignedintupdown=ioread32(S3C2410_GPGDAT)&0x1;97. if(updown)98. input_report_key(dev,BTN_4,0);99. else100. input_report_key(dev,BTN_4,1);101. input_sync(dev);102. returnIRQ_HANDLED;103. 104. staticirqreturn_tkeyboard_right_action(intirq,void*dev_id)105. 106. /printk(KERN_INFOrightispressed!/n);107. unsignedintupdown=ioread32(S3C2410_GPGDAT)&(0x1evbit0=BIT(EV_SYN)|BIT(EV_KEY);140. /*DoNotforgettosetkeybitofBTN_0-BTN_5*/141. dev-keybitBIT_WORD(BTN_0)=BIT_MASK(BTN_0)|BIT_MASK(BTN_1)|BIT_MASK(BTN_2)|BIT_MASK(BTN_3)|BIT_MASK(BTN_4)|BIT_MASK(BTN_5);142. dev-name=s3c2440_keyboard_name;143. /dev-id.bustype144. /dev-id.vendor145. /duct146. /dev-id.version147. printk(inputdevicehasallocated/n);148. /*RegisteranInterruptHandlertoIRQ_EINT0*/149. if(request_irq(IRQ_EINT0,keyboard_sw1_action,IRQF_SAMPLE_RANDOM,s3c2440_keyboard_action,dev)150. 151. printk(KERN_ERRmy_keyboard.c:CouldnotallocatekeyboardIRQ_EINT0!/n);152. return-EIO;153. 154. if(request_irq(IRQ_EINT1,keyboard_sw2_action,IRQF_SAMPLE_RANDOM,s3c2440_keyboard_action,dev)155. 156. printk(KERN_ERRmy_keyboard.c:CouldnotallocatekeyboardIRQ_EINT1!/n);157. return-EIO;158. 159. if(request_irq(IRQ_EINT2,keyboard_up_action,IRQF_SAMPLE_RANDOM,s3c2440_keyboard_action,dev)160. 161. printk(KERN_ERRmy_keyboard.c:CouldnotallocatekeyboardIRQ_EINT2!/n);162. return-EIO;163. 164. if(request_irq(IRQ_EINT3,keyboard_down_action,IRQF_SAMPLE_RANDOM,s3c2440_keyboard_action,dev)165. 166. printk(KERN_ERRmy_keyboard.c:CouldnotallocatekeyboardIRQ_EINT3!/n);167. return-EIO;168. 169. if(request_irq(IRQ_EINT8,keyboard_left_action,IRQF_SAMPLE_RANDOM,s3c2440_keyboard_action,dev)170. 171. printk(KERN_ERRmy_keyboard.c:CouldnotallocatekeyboardIRQ_EINT8!/n);172. return-EIO;173. 174. if(request_irq(IRQ_EINT9,keyboard_right_action,IRQF_SAMPLE_RANDOM,s3c2440_keyboard_action,dev)175. 176. printk(KERN_ERRmy_keyboard.c:CouldnotallocatekeyboardIRQ_EINT9!/n);177. return-EIO;178. 179. printk(KERN_INFO%ssuccessfullyloaded/n,s3c2440_keyboard_name);180. input_register_device(dev);181. return0;182. 183. /*184. *s3c2440my_keyboardmoduleexitfunction185. */186. staticvoid_exits3c2440_keyboard_exit(void)187. 188. disable_irq(IRQ_EINT0);189. disable_irq(IRQ_EINT1);190. disable_irq(IRQ_EINT2);191. disable_irq(IRQ_EINT3);192. disable_irq(IRQ_EINT8);193. disable_irq(IRQ_EINT9);194. free_irq(IRQ_EINT0,dev);195. free_irq(IRQ_EINT1,dev);196. free_irq(IRQ_EINT2,dev);197. free_irq(IRQ_EINT3,dev);198. free_irq(IRQ_EINT8,dev);199. free_irq(IRQ_EINT9,dev);200. input_unregister_device(dev);201. 202. module_init(s3c2440_keyboard_init);203. module_exit(s3c2440_keyboard_exit);2) 一个简单的上层应用程序，通过读取键盘对应的设备文件将input子系统上报的键盘事件打印出来cppview plaincopy1. /*2. *Copyright(c)2011ShenYunlong3. *4. *5. *Thisprogramisfreesoftware;youcanredistributeitand/ormodifyit6. *underthetermsoftheGNUGeneralPublicLicenseversion2aspublishedby7. *theFreeSoftwareFoundation.8. */9. #include10. #include11. #include12. #include13. #include14. #include15. #include16. #include17. #defineMY_DEBUG018. intmain()19. 20. char*dev=/dev/event1;21. structinput_eventievent;22. intretval;23. unsignedshorttype;24. unsignedshortcode;25. intvalue