You're reading from Mastering Linux Device Driver Development Write custom device drivers to support computer peripherals in Linux operating systems

Product type Paperback

Published in Jan 2021

Publisher Packt

ISBN-13 9781789342048

Length 646 pages

Edition 1st Edition

Languages

C++

Tools

Linux

Concepts

Embedded Systems

Author (1):

John Madieu

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Table of Contents (19) Chapters

Preface

1. Section 1:Kernel Core Frameworks for Embedded Device Driver Development

2. Chapter 1: Linux Kernel Concepts for Embedded Developers FREE CHAPTER

3. Chapter 2: Leveraging the Regmap API and Simplifying the Code

4. Chapter 3: Delving into the MFD Subsystem and Syscon API

5. Chapter 4: Storming the Common Clock Framework

6. Section 2: Multimedia and Power Saving in Embedded Linux Systems

7. Chapter 5: ALSA SoC Framework – Leveraging Codec and Platform Class Drivers

8. Chapter 6: ALSA SoC Framework – Delving into the Machine Class Drivers

9. Chapter 7: Demystifying V4L2 and Video Capture Device Drivers

10. Chapter 8: Integrating with V4L2 Async and Media Controller Frameworks

11. Chapter 9:Leveraging the V4L2 API from the User Space

12. Chapter 10: Linux Kernel Power Management

13. Section 3: Staying Up to Date with Other Linux Kernel Subsystems

14. Chapter 11: Writing PCI Device Drivers

15. Chapter 12: Leveraging the NVMEM Framework

16. Chapter 13: Watchdog Device Drivers

17. Chapter 14: Linux Kernel Debugging Tips and Best Practices

18. Other Books You May Enjoy

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Introduction to machine class drivers

Codec and platform drivers cannot work alone. Machine drivers are responsible for binding them together in order to finish audio information processing. The machine driver class acts as the glue that describes and ties the other component drivers together to form an ALSA sound card device. It manages any machine-specific controls and machine-level audio events (such as turning on an amp at the start of playback). The machine drivers describe and bind the CPU Digital Audio Interfaces (DAIs) and codec drivers together to create the DAI links and the ALSA sound card. The machine driver connects the codec drivers by linking the DAIs exposed by each module (the CPU and codec) described in Chapter 5, ALSA SoC Framework – Leveraging Codec and Platform Class Drivers. It defines the struct snd_soc_dai_link structure and instantiates the sound card, struct snd_soc_card.

Platform and codec drivers are generally reusable, but machine drivers are...