You're reading from Linux Device Driver Development Everything you need to start with device driver development for Linux kernel and embedded Linux

Product type Paperback

Published in Apr 2022

Publisher Packt

ISBN-13 9781803240060

Length 708 pages

Edition 2nd Edition

Languages

C++

Tools

Linux

Concepts

Embedded Systems

Author (1):

John Madieu

View More author details

Table of Contents (23) Chapters

Preface

1. Section 1 -Linux Kernel Development Basics

2. Chapter 1: Introduction to Kernel Development FREE CHAPTER

3. Chapter 2: Understanding Linux Kernel Module Basic Concepts

4. Chapter 3: Dealing with Kernel Core Helpers

5. Chapter 4: Writing Character Device Drivers

6. Section 2 - Linux Kernel Platform Abstraction and Device Drivers

7. Chapter 5: Understanding and Leveraging the Device Tree

8. Chapter 6: Introduction to Devices, Drivers, and Platform Abstraction

9. Chapter 7: Understanding the Concept of Platform Devices and Drivers

10. Chapter 8: Writing I2C Device Drivers

11. Chapter 9: Writing SPI Device Drivers

12. Section 3 - Making the Most out of Your Hardware

13. Chapter 10: Understanding the Linux Kernel Memory Allocation

14. Chapter 11: Implementing Direct Memory Access (DMA) Support

15. Chapter 12: Abstracting Memory Access – Introduction to the Regmap API: a Register Map Abstraction

16. Chapter 13: Demystifying the Kernel IRQ Framework

17. Chapter 14: Introduction to the Linux Device Model

18. Section 4 - Misc Kernel Subsystems for the Embedded World

19. Chapter 15: Digging into the IIO Framework

20. Chapter 16: Getting the Most Out of the Pin Controller and GPIO Subsystems

21. Chapter 17: Leveraging the Linux Kernel Input Subsystem

22. Other Books You May Enjoy

Dealing with platform devices

Before we start writing platform drivers, this section will teach you how and where to instantiate platform devices. Only after that will we delve into the platform driver implementation. Platform device instantiation in the Linux kernel has existed for a long time and has been improved all over the kernel versions, and we will discuss the specificities of each instantiation method in this section.

Allocating and registering platform devices

Since there is no way for platform devices to make themselves known to the system, they must be populated manually and registered with the system along with their resources and private data. In the early platform core days, platform devices were declared in the board file, arch/arm/mach-* (which is arch/arm/mach-imx/mach-imx6q.c for i.MX6), and made known to the kernel with platform_device_add() or platform_device_register(), depending on how each platform device has been allocated.

This leads us to conclude...