2、ypes.h>#include#defineMY_LED_MAJOR250//定义主设备号#defineLED_ON0#defineLED_OFF1structglobal_dev{structcdevcdev;};//定义设备结构体structglobal_dev*global_devp;//定义一个指向设备结构体的指针staticintmy_led_open(structinode*inode,structfile*filp){filp->private_data=global_devp;return0;}s
3、taticintmy_led_release(structinode*inode,structfile*file){return0;}staticintmy_led_ioctl(structinode*inode,structfile*filp,unsignedintcmd,unsignedlongdata){switch(cmd){caseLED_ON:at91_set_gpio_value(AT91_PIN_PC0,0);//将PC0引脚置低break;caseLED_OFF:at91_set_gpio_value(AT91_PIN
4、_PC0,1);//将PC1引脚置高break;default:printk("novalidcmdinput!");break;}return0;}structfile_operationsmy_led_ctl_ops={.owner=THIS_MODULE,.open=my_led_open,.release=my_led_release,.ioctl=my_led_ioctl,};/*初始化设备结构体*/staticvoidmy_led_setup(structglobal_dev*dev,intindex){interr;i
5、ntdevno=MKDEV(MY_LED_MAJOR,index);cdev_init(&dev->cdev,&my_led_ctl_ops);dev->cdev.owner=THIS_MODULE;dev->cdev.ops=&my_led_ctl_ops;err=cdev_add(&dev->cdev,devno,1);if(err)printk("addmyledsetupfailed!");}staticintmy_led_init(void){intret;dev_tdevno=MKDEV(MY_LED_MAJOR,0);
6、//创建设备号printk("myfirstdriver--led!");at91_set_GPIO_periph(AT91_PIN_PC0,1);at91_set_gpio_output(AT91_PIN_PC0,1);//对PC0引脚的初始化ret=register_chrdev_region(devno,1,"my_led");//申请设备号if(ret<0){printk("my_ledinit_modulefailedwith%d",ret);returnret;}elseprintk("my_ledinit_modu
7、lesuccess!");global_devp=kmalloc(sizeof(structglobal_dev),GFP_KERNEL);//申请设备内存memset(global_devp,0,sizeof(structglobal_dev));my_led_setup(global_devp,0);returnret;}staticvoidmy_led_cleanup(void){cdev_del(&global_devp->cdev);//删除设备kfree(global_devp);//释放内存unregister_chr
8、dev_region(MKDEV(MY_LED_MAJOR,0),1);//释放设备号}MODULE_LICENSE("MYGPL");MODULE_AUTHOR("FANY");module_init(m
