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Linux Device Drivers Development

Linux Device Drivers Development

By : John Madieu
4 (30)
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Linux Device Drivers Development

Linux Device Drivers Development

4 (30)
By: John Madieu

Overview of this book

Linux kernel is a complex, portable, modular and widely used piece of software, running on around 80% of servers and embedded systems in more than half of devices throughout the World. Device drivers play a critical role in how well a Linux system performs. As Linux has turned out to be one of the most popular operating systems used, the interest in developing proprietary device drivers is also increasing steadily. This book will initially help you understand the basics of drivers as well as prepare for the long journey through the Linux Kernel. This book then covers drivers development based on various Linux subsystems such as memory management, PWM, RTC, IIO, IRQ management, and so on. The book also offers a practical approach on direct memory access and network device drivers. By the end of this book, you will be comfortable with the concept of device driver development and will be in a position to write any device driver from scratch using the latest kernel version (v4.13 at the time of writing this book).
Table of Contents (23 chapters)
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1
Introduction to Kernel Development

Driver architecture and data structures

Drivers for such devices should provide:

  • Methods to establish GPIO direction (input and output).
  • Methods used to access GPIO values (get and set).
  • Methods to map a given GPIO to IRQ and return the associated number.
  • Flag saying whether calls to its methods may sleep. This is very important.
  • An optional debugfs dump method (showing extra state such as pullup config).
  • An optional number called a base number, from which GPIO numbering should start. It will be automatically assigned if omitted.

In the kernel, a GPIO controller is represented as an instance of struct gpio_chip, defined in linux/gpio/driver.h:

struct gpio_chip { 
  const char *label; 
  struct device *dev; 
  struct module *owner; 
 
  int (*request)(struct gpio_chip *chip, unsigned offset); 
  void (*free)(struct gpio_chip *chip, unsigned offset); 
  int (*get_direction)(struct...

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