I/O Kit Fundamentals: ADB

< Previous PageNext Page >

Hide TOC

ADB

The ADB family provides support for, and access to, devices attached to the Apple Desktop Bus (ADB). It provides an abstraction for ADB bus controller drivers (IOADBController) and another for drivers of ADB devices (IOADBDevice).

Bundle identifier:

com.apple.iokit.IOADBFamily

Headers at:

Kernel resident: Kernel.framework/Headers/IOKit/adb/
Device interface: IOKit.framework/Headers/adb

References and specifications:

Chapter 5 — “ADB Manager” of Inside Macintosh: Devices (http://developer.apple.com/documentation/Hardware/DeviceManagers/adb/adb.html)
Technical note HW01 (http://developer.apple.com/technotes/hw/hw_01.html)
Guide to the Macintosh Family Hardware, second edition, Apple Computer.

Class hierarchy:

Device Interface:

Exports an interface for reading and writing registers on ADB devices. The interface is defined in IOADBLib.h. Only polled mode operations are supported through this library. Interrupt operations are only supported for kernel-resident clients.

**Table A-1** Clients and providers of the ADB family
	Client of the nub	Provider for the nub
Action	Drives devices that plug into an ADB port.	Drives an ADB bus controller
Example	A driver for an ADB mouse is a client of the ADB family but is a member of the HID family (in the IOHIPointing class).
Classes	An instance of IOADBDevice matches your driver and loads it into the kernel. Your driver communicates with its family through an instance of IOADBDevice.	ADB bus controller drivers should inherit from the IOADBController class as defined in the header file `IOADBController.h`
Notes	Common client families include the HID family (IOHIPointing and, IOHIKeyboard classes) and the Graphics family (IODisplay class).	All current ADB bus hardware produced by Apple is well supported by drivers that are included with Mac OS X. Third-party developers should not need to write drivers for the ADB family, except for ADB-USB adaptors.

< Previous PageNext Page >

Hide TOC

Last updated: 2007-05-17

Did this document help you?
Yes: Tell us what works for you. It’s good, but: Report typos, inaccuracies, and so forth. It wasn’t helpful: Tell us what would have helped.




	Get information on Apple products. Visit the Apple Store online or at retail locations. 1-800-MY-APPLE Copyright © 2007 Apple Inc. All rights reserved. \| Terms of use \| Privacy Notice