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Mastering Linux Device Driver Development

Mastering Linux Device Driver Development

By : John Madieu
4.8 (4)
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Mastering Linux Device Driver Development

Mastering Linux Device Driver Development

4.8 (4)
By: John Madieu

Overview of this book

Linux is one of the fastest-growing operating systems around the world, and in the last few years, the Linux kernel has evolved significantly to support a wide variety of embedded devices with its improved subsystems and a range of new features. With this book, you’ll find out how you can enhance your skills to write custom device drivers for your Linux operating system. Mastering Linux Device Driver Development provides complete coverage of kernel topics, including video and audio frameworks, that usually go unaddressed. You’ll work with some of the most complex and impactful Linux kernel frameworks, such as PCI, ALSA for SoC, and Video4Linux2, and discover expert tips and best practices along the way. In addition to this, you’ll understand how to make the most of frameworks such as NVMEM and Watchdog. Once you’ve got to grips with Linux kernel helpers, you’ll advance to working with special device types such as Multi-Function Devices (MFD) followed by video and audio device drivers. By the end of this book, you’ll be able to write feature-rich device drivers and integrate them with some of the most complex Linux kernel frameworks, including V4L2 and ALSA for SoC.
Table of Contents (19 chapters)
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1
Section 1:Kernel Core Frameworks for Embedded Device Driver Development
6
Section 2: Multimedia and Power Saving in Embedded Linux Systems
13
Section 3: Staying Up to Date with Other Linux Kernel Subsystems

Chapter 12: Leveraging the NVMEM Framework

The NVMEM (Non-Volatile MEMory) framework is the kernel layer to handle non-volatile storage, such as EEPROM, eFuse, and so on. The drivers for these devices used to be stored in drivers/misc/, where most of the time each one had to implement its own API to handle identical functionalities, either for kernel users or to expose its content to user space. It turned out that these drivers seriously lacked abstraction code. Moreover, the increasing support for the number of these devices in the kernel led to a lot of code duplication.

The introduction of this framework in the kernel aims at solving these previously mentioned issues. It also introduces DT representation for consumer devices to get the data they require (MAC addresses, SoC/revision ID, part numbers, and so on) from the NVMEM. We will begin this chapter by introducing NVMEM data structures, which are mandatory to walk through the framework, and then we will look at the NVMEM provider...

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