一、添加頭文件二、構(gòu)造fileoperation結(jié)構(gòu)體static struct fileoperations second_drv_fops = {.owner = THIS_MODULE;.open = second_drv_open;.write = ;second_drv_write}三、填充file_operations中的成員函數(shù) static int second_drv_open(struct inode *inode,struct file *file) {return 0; }ssize_t second_drv_read(struct file *file,char __user *buf,size_t size,loff_t *ppos) {return 0; }還有初始化函數(shù)static int second_drv_init(void) {major = register_chrdev(0,"second_drv",&second_drv_fops);return 0; }static int second_drv_exit(void) {unregister_chrdev(major,"second_drv");return 0; }module_init(second_drv_init); module_exit(second_drv_exit);要使用udev(mdev機(jī)制)根據(jù)信息來(lái)創(chuàng)造設(shè)備節(jié)點(diǎn)先創(chuàng)建一個(gè)class，再創(chuàng)建一個(gè)設(shè)備。 定義兩個(gè)結(jié)構(gòu)體： static struct class *seconddrv_class; static struct class_device *seconddrv_class_dev;static int second_drv_init(void) { //創(chuàng)建一個(gè)類，在類下面創(chuàng)建一個(gè)設(shè)備。 //mdev是udev的簡(jiǎn)化版本major = register_chrdev(0,"second_drv",&second_drv_fops);seconddrv_class = class_create(THIS_MODULE,"seconddrv");seconddrv_class_dev = class_device_create(seconddrv_class,NULL,MKDEV(major,0),NULL,"buttons");return 0; }static void second_drv_exit(void) {unregister_chrdev(major,"first_drv");class_device_unregister(seconddrv_class_dev);class_destroy(seconddrv_class); }

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轉(zhuǎn)載于:https://www.cnblogs.com/stm32f4/p/8335104.html

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