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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

I2C and the device tree

As we have seen in the preceding sections, in order to configure I2C devices, there are essentially two steps:

  1. Define and register the I2C driver
  2. Define and register the I2C devices

I2C devices belong to non-memory mapped devices family in the DT, and I2C bus is an addressable bus (by addressable, I mean you can address a specific device on the bus). In this, the reg property in the device node represents the device address on the bus.

I2C device nodes are all children of the bus node they sit on. Each device is assigned only an address. There is no length or range involved. Standard properties you need to declare for I2C devices are reg, which represents the address of the device on the bus, and the compatible string, which is used to match the device with a driver. For more information on addressing, you can refer to Chapter 6, The Concept of Device...

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