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

View More author details

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

Leave a review - let other readers know what you think

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

Audio is an analog phenomenon that can be produced in all sorts of ways. Voice and audio have been communication media since the beginning of humanity. Almost every kernel provides audio support to userspace applications as an interaction mechanism between computers and humans. To achieve this, the Linux kernel provides a set of APIs known as ALSA, which stands for Advanced Linux Sound Architecture.

ALSA was designed for desktop computers, not taking into account embedded world constraints. This added a lot of drawbacks when it came to dealing with embedded devices, such as the following:

Strong coupling between codec and CPU code, leading to difficulties in porting and code duplication.
No standard way to handle notifications about users' audio-related behavior. In mobile scenarios, users' audio-related behaviors are frequent, so a special mechanism is needed.
In the original...