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.
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