《Essential Linux Device Drivers》前言（中英文）
作者 佚名技术
来源 Linux系统
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发布时间 2012-05-16
| Preface It was the late 1990s and at IBM, we were putting the Linux kernel on a wrist watch. The target device was tiny, but the task was turning out to be tough. The Memory Technology Devices subsystem didn’t exist in the kernel, which meant that before a filesystem could start life on the watch’s flash memory, we had to develop the necessary storage driver from scratch. Interfacing the watch’s touch screen with user applications was complicated since the kernel’s input event driver interface hadn’t been conceived yet. Getting X-Windows to run on the watch''s LCD wasn’t easy since it didn’t work well with frame buffer drivers. Of what use is a water-proof Linux wrist watch if you can’t stream stock quotes from your bath tub? Bluetooth integration with Linux was several years away, and months were spent porting a proprietary Bluetooth stack to Internet-enable the watch. Power management support was good enough only to squeeze a few hours of juice from the watch''s battery, hence we had work cut out on that front too. Linux-Infrared was still unstable, so we had to coax the stack before we could use an Infrared keyboard for data entry. And we had to compile the compiler and cross-compile a compact application-set since there were no accepted distributions in the consumer electronics space. Fast forward to the present: The baby penguin has grown into a healthy teenager. What took thousands of lines of code and a year in development back then, can be accomplished in a few days with the current kernels. But to become a versatile kernel engineer who can magically weave solutions, you need to understand the myriad features and facilities that Linux offers today.About the Book Among the various subsystems residing in the kernel source tree, the drivers/directory constitutes the single largest chunk and is several times bigger than the others. With new and diverse technologies arriving in popular form factors, the development of new device drivers in the kernel is accelerating steadily. The latest kernels support over 70 device driver families. This book is about writing Linux device drivers. It covers the design and development of major device classes supported by the kernel, including those I missed during my Linux-on-Watch days. The discussion of each driver family starts by looking at the corresponding technology, moves on to develop a practical example, and ends by looking at relevant kernel source files. But before foraying into the world of device drivers, the book introduces you to the kernel and discusses the important features of 2.6 Linux, emphasizing those portions that are of special interest to device driver writers. Audience This book is intended for the intermediate-level programmer eager to tweak the kernel to enable new devices. You should have a working knowledge of operating system concepts. For example, you should know what a system call is, and why concurrency issues have to be factored in while writing kernel c |
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