笔者最近有机会写了一个摄像头的驱动，是“One laptop per child”项目的中摄像头专用的。

这个驱动使用了为此目的而设计的内核API：the Video4Linux2 API。在写这个驱动的过程中，

笔者发现了一个惊人的问题：这个API 的文档工作做得并不是很好，而用户层的文档则写

的，实际上，相当不错。为了补救现在的状况，LWN 将在未来的内个月里写一系列文章，

告诉大家如何写V4L2 接口的驱动。-I recently had the opportunity to write the driver a camera, is "One laptop per child" project dedicated camera.

This driver uses the kernel designed for this purpose API: the Video4Linux2 API. In the course of writing this driver,

I found a surprising question: the API documentation work done is not very good, but the document is written user level

, In fact, quite good. In order to remedy the current situation, LWN will write a series of articles in the coming months, the

Tell you how to write V4L2 interface driver.