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ac6 >> ac6-training >> Operating Systems >> Linux >> Linux USB Drivers, HotPlug and Power Management

D7 Linux USB Drivers, HotPlug and Power Management

Writing drivers with hot-plug and power management support

Objectives

Configure the Linux kernel for optimal hotplug and power management.
Understand the specifics of the Linux kernel in the management of devices and drivers.
Understand how are generated hotplug events and how to use them in writing its drivers.
Understand how Linux manages the power-management

To write drivers integrated in this scheme
To optimize low power modes

Install and use hotplug and power-management utilities: udev, libusb, etc ...
Explore the wealth of Linux drivers for USB host and OTG gagdet.
Know the changes in the latest Linux kernels (2.6.30 and beyond).
Master the techniques of kernel debugging with Lauterbach JTAG probes.

	Labs are conducted on target boards, that can be:
	Atmel ARM9-based boards, with Lauterbach JTAG probes.
	We use the last linux kernel, as delivered on www.kernel.org.
	Labs are conducted using the System Workbench for Linux - Basic Edition IDE.

Course environment

A PC workstation and a target board per two trainees group with Lauterbach JTAG probe.
Printed course material.
CDROM with documentation and exercises solutions.

Prerequisite

Good practice of C programming on Linux
Basic knowledge of Linux kernel and driver programming (see our D3 - Linux Drivers course)

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

Power-management : APM and ACPI

The APM standard.
The ACPI standard.

Exercise:

Writing a user program to shut down the system.

Power-management, suspend and hibernate

Power management in drivers
Freezing tasks
Suspend in RAM
Suspend on Disk

Hibernate

Debugging power management

Exercise:

Writing a kernel module reacting to suspend in RAM and system wakeup

Third Day

Cpu frequency governors

The cpufreq user interface.
The various governors available.

Idle Cpu governors

The Idle task.
The Idle device concept.
CpuIdle governors.

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

Fourth 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
4 days	2380 € HT
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