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ac6 >> ac6-training >> Operating Systems >> Linux >> USB Linux Drivers

D8 USB Linux Drivers

Writing USB-2.0 and USB-3.0 host and gadget drivers on Linux

Objectives

Learn to write Linux drivers for USB-2.0 and USB-3.0

Explore the Linux USB host-driver stack
Learn the structure of USB device drivers
Discover USB gagdet drivers (2.0 and 3.0)
Understand the support for OTG-2.0 and OTG-3.0.

Understand the specifics of the Linux kernel in the management of devices and drivers.
Learn to configure the Linux kernel for optimal hotplug management.

Understand how hotplug events are generated and how to use them in drivers.
Install and use external hotplug daemons: udev, libusb, etc ...

Discover Linux kernel changes up to the latest versions (up to 3.6.39 and 3.x).
Master the techniques of kernel debugging.

	We use a recent linux kernel, as provided by the distribution used or available on www.kernel.org.

Course environment

A PC workstation and a target board per two trainees group.
Printed course material.

Prerequisite

Good practice of C programming on Linux
Good knowledge of Linux kernel and driver programming (see our D3 - Linux Drivers course and D7 - Power Management in Linux Drivers courses)

First day

Reminders on kernel programming

Reminders on kernel module development
Kernel objects

Exercise:

Writing a kernel module creating and using kernel objects and sets

The sysfs file system

Exercise:

Interacting with a kernel module through a kernel object and the sysfs file sytem

Hotplug

Hotplug in the kernel

uevents

Exercise:

Writing a kernel module sending hotplug events to a user mode program.

Hotplug at user level

Udev
Hal and Dbus

Exercise:

Cross-compiling, configuring and using Udev.

Second Day

Devices and Drivers

The Device/Driver model in Linux

Device class and types
Bus drivers

Bus types

Generic devices and drivers
System devices and drivers
Platform devices and drivers

Exercise:

Writing a platform device driver showing how device matching work

USB Drivers

The USB bus

USB devices
USB descriptors
USB endpoints
USB requests

User view of the USB bus and devices
USB device drivers

Hotplug
Communicating with devices through URBs

Exercise:	Writing a basic usb device driver using URBs
Exercise:	Writing an usb device driver using synchronous request management

Third Day

The libUSB user-mode USB driver framework

The libUSB libraries.

libUSB 0.1.12.
libUSB 1.0

Exercise:	Building libUSB
Exercise:	Writing a user-mode USB driver using libUSB

USB gadget drivers

Basic USB gadgets.
Composite USB gaddget drivers.

Exercise:

Writing a gadget driver and the corresponding host driver on the Linux workstation.

The USB On-The-Go (OTG) specification.

OTG support in Linux

Duration	Cost	Calendar
3 days	2290 € HT
Last update: 27 July 2022
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