4.字符设备的注册和注销struct cdev * cdev _ alloc(void)；void cdev_init(struct cdev *dev，struct file _ operations * fops)；int cdev_add(struct cdev *dev，dev_t num无符号int count)；void cdev _ del(struct cdev * dev)；用来管理cdev结构的函数，
详细说明arm-linux字符设备驱动编程的基本过程(linux中字符设备)
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