Having reached the end of this chapter, you are now armed for any PWM controller, whether it is memory mapped or externally sitting on a bus. The API described in this chapter will be sufficient to write, as well as to enhance, a controller driver as a consumer device driver. If you are not comfortable with the PWM kernel side yet, you can fully use the user space sysfs interface. In the next chapter, we will discuss regulators, which are sometimes driven by PWM. So, please hold on, we are almost done.
Linux Device Drivers Development
By :
Linux Device Drivers Development
By:
Overview of this book
Linux kernel is a complex, portable, modular and widely used piece of software, running on around 80% of servers and embedded systems in more than half of devices throughout the World. Device drivers play a critical role in how well a Linux system performs. As Linux has turned out to be one of the most popular operating systems used, the interest in developing proprietary device drivers is also increasing steadily.
This book will initially help you understand the basics of drivers as well as prepare for the long journey through the Linux Kernel. This book then covers drivers development based on various Linux subsystems such as memory management, PWM, RTC, IIO, IRQ management, and so on. The book also offers a practical approach on direct memory access and network device drivers.
By the end of this book, you will be comfortable with the concept of device driver development and will be in a position to write any device driver from scratch using the latest kernel version (v4.13 at the time of writing this book).
Table of Contents (23 chapters)
Preface
Free Chapter
Introduction to Kernel Development
Device Driver Basis
Kernel Facilities and Helper Functions
Character Device Drivers
Platform Device Drivers
The Concept of Device Tree
I2C Client Drivers
SPI Device Drivers
Regmap API – A Register Map Abstraction
IIO Framework
Kernel Memory Management
DMA – Direct Memory Access
The Linux Device Model
Pin Control and GPIO Subsystem
GPIO Controller Drivers – gpio_chip
Advanced IRQ Management
Input Devices Drivers
PWM Drivers
Regulator Framework
Framebuffer Drivers
Network Interface Card Drivers
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