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

Platform driver abstraction and architecture

Let's get warned before going further. Not all platform devices are handled by platform drivers (or, should I say, pseudo platform drivers). Platform drivers are dedicated to devices not based on conventional buses. I2C devices or SPI devices are platform devices, but rely on I2C or SPI buses, respectively, and not on platform buses. Everything needs to be done manually with the platform driver.

Probing and releasing the platform devices

The platform driver entry point is the probe method, invoked after a match with a platform device has occurred. This probe method has the following prototype:

int pdrv_probe(struct platform_device *pdev)

pdev corresponds to the platform device that has been instantiated in the traditional way or a fresh one allocated by the platform core because of the associated device tree node having a direct parent with simple-bus in its compatible property. Platform data and resources, if any, will...