Change notification in USB devices

• US 7,899,952 B2
• Filed: 09/22/2008
• Issued: 03/01/2011
• Est. Priority Date: 05/04/1999
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Apple Inc.
• Inventors: Clark, Thomas C.
• Primary Examiner(s): Knoll; Clifford H
• Application Number:
  US12/284,580
• Publication Number:
  US 20090037613A1
• Time in Patent Office: 890 Days
• Field of Search: 710300-304, 710/104, 710 8- 19, 713/1, 713/2, 713/100
• US Class Current: 710/19
• CPC Class Codes: G06F 13/4081 Live connection to bus, e.g. hot-plugging current or voltage limitation during live insertion H02H9/004
• CPC Class Codes: G06F 2213/0042 Universal serial bus [USB]
• CPC Class Codes: G06F 9/4401 Bootstrapping security arrangements therefor G06F21/57
• CPC Class Codes: G06F 9/4413 Plug-and-play [PnP]

Abstract

A method of notifying clients of a change in a USB including a first client requesting notification of a first change in the USB, detecting the first change in the USB, and notifying the first client requesting notification that the first change in the USB occurred.

Claims

1. A method for notifying clients of a specific change in a data processing system, the method comprising:

in response to a first request from a client for notification of a specific change of a USB (universal serial bus) compatible device in the data processing system, adding the first request to a list of requests for notification, wherein the first request comprises a parameter specifying a device attribute of the USB compatible device; and

in response to detecting the specific change of the USB compatible device in the data processing system, notifying the client originating the first request regarding the specific change of the USB compatible device, according to the parameter of the first request stored in the list of the requests for notification.

2. The method of claim 1, wherein the specific change of the data processing system comprises connecting the USB compatible device to the data processing system.

3. The method of claim 1, wherein the specific change of the data processing system comprises disconnecting the USB compatible device from the data processing system.

4. The method of claim 1, wherein the first request comprises a callback routine of the client, and wherein notifying the client comprises calling the callback routine to notify the client.

5. The method of claim 1, wherein the device attribute is selected from the group consisting of a device class, a device subclass, a device protocol, a device vendor identification, and a device product identification.

6. The method of claim 5, wherein the device class is selected from the group consisting of a printer, a modem, a camera, a microphone, a touch-sensitive screen, and a hard disk drive.

7. The method of claim 5, wherein the device vendor identification is a device manufacturer name.

8. A machine-readable storage medium having instructions, when executed by a machine, cause the machine to perform a method for notifying clients of a specific change in a data processing system, the method comprising:

in response to a first request from a client for notification of a specific change of a USB (universal serial bus) compatible device in the data processing system, adding the first request to a list of requests for notification, wherein the first request comprises a parameter specifying a device attribute of the USB compatible device; and

in response to detecting the specific change of the USB compatible device in the data processing system, notifying the client originating the first request regarding the specific change of the USB compatible device, according to the parameter of the first request stored in the list of the requests for notification.

9. The machine-readable storage medium of claim 8, wherein the specific change of the data processing system comprises connecting the USB compatible device to the data processing system.

10. The machine-readable storage medium of claim 8, wherein the specific change of the data processing system comprises disconnecting the USB compatible device from the data processing system.

11. The machine-readable storage medium of claim 8, wherein the first request comprises a callback routine of the client, and wherein notifying the client comprises calling the callback routine to notify the client.

12. The machine-readable storage medium of claim 8, wherein the device attribute is selected from the group consisting of a device class, a device subclass, a device protocol, a device vendor identification, and a device product identification.

13. The machine-readable storage medium of claim 12, wherein the device class is selected from the group consisting of a printer, a modem, a camera, a microphone, a touch-sensitive screen, and a hard disk drive.

14. The machine-readable storage medium of claim 12, wherein the device vendor identification is a device manufacturer name.

15. An apparatus for notifying clients of a specific change in a data processing system, the apparatus comprising:

means for adding, in response to a first request from a client for notification of a specific change of a USB (universal serial bus) compatible device in the data processing system, the first request to a list of requests for notification, wherein the first request comprises a parameter specifying a device attribute of the USB compatible device; and

means for notifying, in response to detecting the specific change in the data processing system, the client originating the first request regarding the specific change of the USB compatible device, according to the parameter of the first request stored in the list of the requests for notification.

16. The apparatus of claim 15, wherein the specific change of the data processing system comprises connecting the USB compatible device to the data processing system.

17. The apparatus of claim 15, wherein the specific change of the data processing system comprises disconnecting the USB compatible device from the data processing system.

18. The apparatus of claim 15, wherein the first request comprises a callback routine of the client, and wherein notifying the client comprises calling the callback routine to notify the client.

19. The apparatus of claim 15, wherein the device attribute is selected from the group consisting of a device class, a device subclass, a device protocol, a device vendor identification, and a device product identification.

20. The apparatus of claim 19, wherein the device class is selected from the group consisting of a printer, a modem, a camera, a microphone, a touch-sensitive screen, and a hard disk drive.

21. The apparatus of claim 19, wherein the device vendor identification is a device manufacturer name.

22. A data processing system, comprising:

a processor; and

a memory coupled to the processor for storing instructions, when executed from the memory, cause the processor to perform a method, the method including

in response to a first request from a client for notification of a specific change of a USB (universal serial bus) compatible device in the data processing system, adding the first request to a list of requests for notification, wherein the first request comprises a parameter specifying a device attribute of the USB compatible device, and

in response to detecting the specific change in the data processing system, notifying the client originating the first request regarding the specific change of the USB compatible device, according to the parameter of the first request stored in the list of the requests for notification.

23. The data processing system of claim 22, wherein the device attribute is selected from the group consisting of a device class, a device subclass, a device protocol, a device vendor identification, and a device product identification.

24. The data processing system of claim 23, wherein the device class is selected from the group consisting of a printer, a modem, a camera, a microphone, a touch-sensitive screen, and a hard disk drive.

25. The data processing system of claim 23, wherein the device vendor identification is a device manufacturer name.