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You're reading from Linux Device Drivers Development Develop customized drivers for embedded Linux

Product type Paperback

Published in Oct 2017

Publisher Packt

ISBN-13 9781785280009

Length 586 pages

Edition 1st Edition

Languages

Tools

Linux

Concepts

System Administration

Author (1):

John Madieu

View More author details

Table of Contents (31) Chapters

Title Page

Credits

About the Author

About the Reviewer

www.PacktPub.com

Customer Feedback

Dedication

Preface

1. Introduction to Kernel Development FREE CHAPTER

2. Device Driver Basis

3. Kernel Facilities and Helper Functions

4. Character Device Drivers

5. Platform Device Drivers

6. The Concept of a Device Tree

7. I2C Client Drivers

8. SPI Device Drivers

9. Regmap API - A Register Map Abstraction

10. IIO Framework

11. Kernel Memory Management

12. DMA - Direct Memory Access

13. The Linux Device Model

14. Pin Control and GPIO Subsystem

15. GPIO Controller Drivers - gpio_chip

16. Advanced IRQ Management

17. Input Devices Drivers

18. RTC Drivers

19. PWM Drivers

20. Regulator Framework

21. Framebuffer Drivers

22. Network Interface Card Drivers

Index

PMIC/producer driver interface

The producer is the device generating the regulated voltage or current. The name of such a device is PMIC and it can be used for power sequencing, battery management, DC-to-DC conversion, or simple power switches (on/off). It regulates the output power from the input power, with the help of (and under) software control.

It deals with regulator drivers, and especially the producer PMIC side, which requires a few headers:

#include <linux/platform_device.h> 
#include <linux/regulator/driver.h> 
#include <linux/regulator/of_regulator.h>

Driver data structures

We will start with a short walkthrough of data structures used by the regulator framework. Only the producer interface is described in this section.

Description structure

The kernel describes every regulator provided by a PMIC by means of a struct regulator_desc structure, which characterizes a regulator. By regulator, I mean any independent regulated output. For example, the ISL6271A from Intersil...