plat_driver与file_operations两种方法开发led驱动.doc

platform_driver与file_operations两种方法开发led驱动分类：片内驱动开发（I2C、NAND Flash、LINUX内核）片外驱动开发（tuner、demod、ca、e2prom）2011-08-08 13:141538人阅读评论(0)收藏举报filestructmodulectableoutput下面是两个LED灯的驱动程序 一个用platform_driver 另一个用file_operationscppview plaincopy1. #include2. #include3. #include4. #include5. 6. #include7. #include8. #include9. 10. /*ourcontext*/11. 12. structs3c24xx_gpio_led13. structled_classdevcdev;14. structs3c24xx_led_platdata*pdata;15. ;16. 17. staticinlinestructs3c24xx_gpio_led*pdev_to_gpio(structplatform_device*dev)18. 19. returnplatform_get_drvdata(dev);20. 21. 22. staticinlinestructs3c24xx_gpio_led*to_gpio(structled_classdev*led_cdev)23. 24. returncontainer_of(led_cdev,structs3c24xx_gpio_led,cdev);25. 26. 27. staticvoids3c24xx_led_set(structled_classdev*led_cdev,28. enumled_brightnessvalue)29. 30. structs3c24xx_gpio_led*led=to_gpio(led_cdev);31. structs3c24xx_led_platdata*pd=led-pdata;32. 33. /*therewillbeashortdelaybetweensettingtheoutputand34. *goingfromoutputtoinputwhenusingtristate.*/35. 36. s3c2410_gpio_setpin(pd-gpio,(value?1:0)37. (pd-flags&S3C24XX_LEDF_ACTLOW);38. 39. if(pd-flags&S3C24XX_LEDF_TRISTATE)40. s3c2410_gpio_cfgpin(pd-gpio,41. value?S3C2410_GPIO_OUTPUT:S3C2410_GPIO_INPUT);42. 43. 44. 45. staticints3c24xx_led_remove(structplatform_device*dev)46. 47. structs3c24xx_gpio_led*led=pdev_to_gpio(dev);48. 49. led_classdev_unregister(&led-cdev);50. kfree(led);51. 52. return0;53. 54. 55. staticints3c24xx_led_probe(structplatform_device*dev)56. 57. structs3c24xx_led_platdata*pdata=dev-dev.platform_data;58. structs3c24xx_gpio_led*led;59. intret;60. 61. led=kzalloc(sizeof(structs3c24xx_gpio_led),GFP_KERNEL);62. if(led=NULL)63. dev_err(&dev-dev,Nomemoryfordevicen);64. return-ENOMEM;65. 66. 67. platform_set_drvdata(dev,led);68. 69. led-cdev.brightness_set=s3c24xx_led_set;70. led-cdev.default_trigger=pdata-def_trigger;71. =pdata-name;72. 73. led-pdata=pdata;74. 75. /*nopointinhavingapull-upifwearealwaysdriving*/76. 77. if(pdata-flags&S3C24XX_LEDF_TRISTATE)78. s3c2410_gpio_setpin(pdata-gpio,0);79. s3c2410_gpio_cfgpin(pdata-gpio,S3C2410_GPIO_INPUT);80. else81. s3c2410_gpio_pullup(pdata-gpio,0);82. s3c2410_gpio_setpin(pdata-gpio,0);83. s3c2410_gpio_cfgpin(pdata-gpio,S3C2410_GPIO_OUTPUT);84. 85. 86. /*registerournewleddevice*/87. 88. ret=led_classdev_register(&dev-dev,&led-cdev);89. if(retdev,led_classdev_registerfailedn);91. gotoexit_err1;92. 93. 94. return0;95. 96. exit_err1:97. kfree(led);98. returnret;99. 100. 101. 102. #ifdefCONFIG_PM103. staticints3c24xx_led_suspend(structplatform_device*dev,pm_message_tstate)104. 105. structs3c24xx_gpio_led*led=pdev_to_gpio(dev);106. 107. led_classdev_suspend(&led-cdev);108. return0;109. 110. 111. staticints3c24xx_led_resume(structplatform_device*dev)112. 113. structs3c24xx_gpio_led*led=pdev_to_gpio(dev);114. 115. led_classdev_resume(&led-cdev);116. return0;117. 118. #else119. #defines3c24xx_led_suspendNULL120. #defines3c24xx_led_resumeNULL121. #endif122. 123. staticstructplatform_drivers3c24xx_led_driver=124. .probe=s3c24xx_led_probe,125. .remove=s3c24xx_led_remove,126. .suspend=s3c24xx_led_suspend,127. .resume=s3c24xx_led_resume,128. .driver=129. .name=s3c24xx_led,130. .owner=THIS_MODULE,131. ,132. ;133. 134. staticint_inits3c24xx_led_init(void)135. 136. returnplatform_driver_register(&s3c24xx_led_driver);137. 138. 139. staticvoid_exits3c24xx_led_exit(void)140. 141. platform_driver_unregister(&s3c24xx_led_driver);142. 143. 144. module_init(s3c24xx_led_init);145. module_exit(s3c24xx_led_exit);146. 147. MODULE_AUTHOR(BenDooks);148. MODULE_DESCRIPTION(S3C24XXLEDdriver);149. MODULE_LICENSE(GPL);150. MODULE_ALIAS(platform:s3c24xx_led);151. 152. 153. 154. 155. 另一个如下：156. 157. #include158. #include159. #include160. 161. #defineDEVICE_NAMEleds162. 163. staticunsignedlongled_table=164. S3C2410_GPB5,165. 166. S3C2410_GPB6,167. S3C2410_GPB7,168. S3C2410_GPB8,169. ;170. 171. staticunsignedintled_cfg_table=172. S3C2410_GPB5_OUTP,173. 174. S3C2410_GPB6_OUTP,175. S3C2410_GPB7_OUTP,176. S3C2410_GPB8_OUTP,177. ;178. 179. staticintsbc2440_leds_ioctl(180. structinode*inode,181. structfile*file,182. unsignedintcmd,183. unsignedlongarg)184. 185. switch(cmd)186. case0:187. case1:188. if(arg4)189. return-EINVAL;190. 191. s3c2410_gpio_setpin(led_tablearg,!cmd);192. return0;193. default:194. return-EINVAL;195. 196. 197. 198. staticstructfile_operationsdev_fops=199. .owner=THIS_MODULE,200. .ioctl=sbc2440_leds_ioctl,201. ;202. 203. staticstructmiscdevicemisc=204. .minor=MISC_DYNAMIC_MINOR,205. .name=DEVICE_NAME,206. .fops=&dev_fops,207. ;208. 209. staticint_initdev_init(void)210. 211. intret;212. 213. inti;214. 215. for(i=0;i4;i+)216. s3c2410_gpio_cfgpin(led_tablei,led_cfg_tablei);217. s3c2410_gpio_setpin(led_tablei,0);218. 219. 220. ret=misc_register(&misc);221. 222. prin