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Linux Device Driver 3rd Edition.pdf
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Linux Device Driver 3rd Edition.pdf
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LINUX
DEVICE
DRIVERS
,TITLE.9502 Page i Thursday, January 27, 2005 12:06 PM
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LINUX
DEVICE
DRIVERS
THIRD EDITION
Jonathan Corbet, Alessandro
Rubini, and Greg Kroah-Hartman
Beijing
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,TITLE.9502 Page iii Thursday, January 27, 2005 12:06 PM
Linux Device Drivers, Third Edition
by Jonathan Corbet, Alessandro Rubini, and Greg Kroah-Hartman
Copyright © 2005, 2001, 1998 O’Reilly Media, Inc. All rights reserved.
Printed in the United States of America.
Published by O’Reilly Media, Inc., 1005 Gravenstein Highway North, Sebastopol, CA 95472.
O’Reilly books may be purchased for educational, business, or sales promotional use. Online editions
are also available for most titles (safari.oreilly.com). For more information, contact our corporate/insti-
tutional sales department: (800) 998-9938 or corporate@oreilly.com.
Editor:
Andy Oram
Production Editor:
Matt Hutchinson
Production Services:
Octal Publishing, Inc.
Cover Designer:
Edie Freedman
Interior Designer:
Melanie Wang
Printing History:
February 1998: First Edition.
June 2001: Second Edition.
February 2005: Third Edition.
Nutshell Handbook, the Nutshell Handbook logo, and the O’Reilly logo are registered trademarks of
O’Reilly Media, Inc. The Linux series designations, Linux Device Drivers, images of the American West,
and related trade dress are trademarks of O’Reilly Media, Inc.
Many of the designations used by manufacturers and sellers to distinguish their products are claimed as
trademarks. Where those designations appear in this book, and O’Reilly Media, Inc. was aware of a
trademark claim, the designations have been printed in caps or initial caps.
While every precaution has been taken in the preparation of this book, the publisher and authors
assume no responsibility for errors or omissions, or for damages resulting from the use of the
information contained herein.
This work is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 2.0
License. To view a copy of this license, visit http://creativecommons.org/licenses/by-sa/2.0/ or send a
letter to Creative Commons, 559 Nathan Abbott Way, Stanford, California 94305, USA.
This book uses RepKover
™
, a durable and flexible lay-flat binding.
ISBN: 0-596-00590-3
[M]
,COPYRIGHT.10321 Page iv Thursday, January 27, 2005 12:09 PM
v
Table of Contents
Preface
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
xi
1. An Introduction to Device Drivers
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1
The Role of the Device Driver 2
Splitting the Kernel 4
Classes of Devices and Modules 5
Security Issues 8
Version Numbering 10
License Terms 11
Joining the Kernel Development Community 12
Overview of the Book 12
2. Building and Running Modules
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
15
Setting Up Your Test System 15
The Hello World Module 16
Kernel Modules Versus Applications 18
Compiling and Loading 22
The Kernel Symbol Table 28
Preliminaries 30
Initialization and Shutdown 31
Module Parameters 35
Doing It in User Space 37
Quick Reference 39
3. Char Drivers
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
42
The Design of scull 42
Major and Minor Numbers 43
Some Important Data Structures 49
,ldr3TOC.fm.4587 Page v Thursday, January 20, 2005 9:30 AM
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