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Mastering Linux Device Driver Development

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

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Product type Paperback
Published in Jan 2021
Publisher Packt
ISBN-13 9781789342048
Length 646 pages
Edition 1st Edition
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John Madieu John Madieu
Author Profile Icon John Madieu
John Madieu
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Table of Contents (19) Chapters Close

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

Framework architecture and the main data structures

Video devices are becoming increasingly complex. In such devices, hardware often comprises several integrated IPs that need to cooperate with one another in a controlled manner, and this leads to complex V4L2 drivers. This requires figuring out the architecture prior to delving into the code and this is precisely the requirement that this section addresses.

It is known that drivers normally mirror the hardware model in programming. In the V4L2 context, the diverse IP components are modeled as software blocks called sub-devices. V4L2 sub-devices are usually kernel-only objects. Moreover, if the V4L2 driver implements the media device API (which we will discuss in the next chapter, Chapter 8, Integrating with V4L2 Async and Media Controller Frameworks), those sub-devices will automatically inherit from media entities, allowing applications to enumerate the sub-devices and to discover the hardware topology using the media framework...

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