sp; // 1-2 --|这一步写上, 高级操作.
// .unlocked_ioctl = i2cdev_ioctl,
.open = mydemodev_open, // 1-1 --|
.release = mydemodev_release, // 1-1 --| 这一步写上, 基本上就可以看到效果了.
};
static struct class *mydemo_dev_class;
static int __init mydemo_dev_init(void)
{
int res;
printk(KERN_INFO "my char dev demo entries driver\n");
res = register_chrdev(MYDEMO_MAJOR, "mydemo", &mydemodev_fops); //1. 注册字符设备
if (res)
goto out;
mydemo_dev_class = class_create(THIS_MODULE, "mydemo-class"); //2. 生成class, 在 /sys/class/ 下生成mydemo-class文件夹
if (IS_ERR(mydemo_dev_class)) {
res = PTR_ERR(mydemo_dev_class);
goto out_unreg_chrdev;
}
device_create(mydemo_dev_class,NULL,MKDEV(MYDEMO_MAJOR, MYDEMO_MINNOR),NULL,"mydemo-dev" "%d", MYDEMO_MINNOR); //3. 生成class, 在 /dev/ 下生成mydemo-dev9节点.
return 0;
class_destroy(mydemo_dev_class);
out_unreg_chrdev:
unregister_chrdev(MYDEMO_MAJOR, "mydemo");
out:
printk(KERN_ERR "%s: Driver Initialisation failed\n", __FILE__);
return res;
}
static void __exit mydemo_dev_exit(void)
{
printk(KERN_INFO "my char dev demo out driver\n");
class_destroy(mydemo_dev_class);
unregister_chrdev(MYDEMO_MAJOR, "mydemo");
}
MODULE_AUTHOR("EastonWoo <31417071@qq.com>");
MODULE_DESCRIPTION("my char dev demo entries driver");
MODULE_LICENSE("GPL");
module_init(mydemo_dev_init);
module_exit(mydemo_dev_exit);
6. 修改drivers/Makefile:
添加obj-$(CONFIG_MY_DEMO) += MyDemo/
7. 修改drivers/char/Kconfig:
添加source "drivers/MyDemo/Kconfig"
这样就完成了.可以编译测试了.