【实践】第一个驱动之自动生成主设备号和设备文件

###1、声明两个变量

static struct class *firstdrv_class;
static struct class_device *firstdrv_class_dev;

###2、修改函数first_drv_init(void)和first_drv_exit(void)

int major;
int first_drv_init(void)
{
	major = register_chrdev(0,"first drv",&first_drv_fops);
	firstdrv_class = class_create(THIS_MODULE, "firstdrv");
	firstdrv_class_dev = class_device_create(firstdrv_class, null, dev_t devt, MKDEV(major,0),NULL,"xyz");
	
	return 0;
}

void first_drv_exit(void)
{
	unregister_chrdev(major,"first drv");

	class_device_unregister(firstdrv_class_dev);
	class_destroy(firstdrv_class);
}

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