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Linux Device Drivers Development

You're reading from Linux Device Drivers Development Develop customized drivers for embedded Linux

Product type Paperback

Published in Oct 2017

Publisher Packt

ISBN-13 9781785280009

Length 586 pages

Edition 1st Edition

Languages

C

Tools

Linux

Concepts

System Administration

Author (1):

John Madieu

View More author details

Table of Contents (31) Chapters

Title Page

Credits

About the Author

About the Reviewer

www.PacktPub.com

Customer Feedback

Dedication

Preface

1. Introduction to Kernel Development FREE CHAPTER

2. Device Driver Basis

3. Kernel Facilities and Helper Functions

4. Character Device Drivers

5. Platform Device Drivers

6. The Concept of a Device Tree

7. I2C Client Drivers

8. SPI Device Drivers

9. Regmap API - A Register Map Abstraction

10. IIO Framework

11. Kernel Memory Management

12. DMA - Direct Memory Access

13. The Linux Device Model

14. Pin Control and GPIO Subsystem

15. GPIO Controller Drivers - gpio_chip

16. Advanced IRQ Management

17. Input Devices Drivers

18. RTC Drivers

19. PWM Drivers

20. Regulator Framework

21. Framebuffer Drivers

22. Network Interface Card Drivers

Index

Chapter 9. Regmap API - A Register Map Abstraction

Before the regmap API was developed, there was redundant code for the device drivers dealing with SPI core, I2C core, or both. The principle was the same: accessing the register for read/write operations. The following diagram shows how either the SPI or I2C API were standalone before regmap was introduced to the kernel:

SPI and I2C subsystems before regmap

The regmap API was introduced in version 3.1 of the kernel, to factorize and unify the way kernel developers access SPI/I2C devices. It is then just a matter of how to initialize and configure a regmap, and process any read/write/modify operation fluently, whether it is SPI or I2C:

SPI and I2C subsystems after regmap

This chapter will walk through the regmap framework as follows:

Introducing the main data structures used in the regmap framework
Walking through regmap configuration
Accessing devices using the regmap API
Introducing the regmap caching system
Providing a complete driver that summarizes...

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Authors (1)

John Madieu

John Madieu

John Madieu is an embedded Linux and kernel engineer living in Paris, France. His main activities consist of developing device drivers and Board Support Packages (BSPs) for companies in domains such as IoT, automation, transport, healthcare, energy, and the military. John is the founder and chief consultant at LABCSMART, a company that provides training and services for embedded Linux and Linux kernel engineering. He is an open source and embedded systems enthusiast, convinced that it is only by sharing knowledge that we can learn more. He is passionate about boxing, which he practiced for 6 years professionally, and continues to channel this passion through training sessions that he provides voluntarily.

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