Re: Possible to ignore kIOHIDOptionsTypeSeizeDevice ?

• Subject: Re: Possible to ignore kIOHIDOptionsTypeSeizeDevice ?
• From: Rich Kubota <email@hidden>
• Date: Tue, 16 Aug 2005 09:43:45 -0700
• Delivered-to: email@hidden
• Delivered-to: email@hidden

Ben,

Note the attachement will come in a separate email directly for you.

The project creates a kext call "HIDNoMatchDevice"

to modify it to work with your device,
1. open the project file
2. in the project window open the "Info.plist" file
Note the following IOKit Personality

	<key>IOKitPersonalities</key>
	<dict>
		<key>White AppleKeyboard</key>
		<dict>
			<key>CFBundleIdentifier</key>
			<string>com.apple.kernel.iokit</string>
			<key>IOClass</key>
			<string>IOservice</string>
			<key>IOProviderClass</key>
			<string>IOUSBInterface</string>
			<key>bConfigurationValue</key>
			<integer>1</integer>
			<key>bInterfaceNumber</key>
			<integer>1</integer>
			<key>bcdDevice</key>
			<integer>290</integer>
			<key>idProduct</key>
			<integer>516</integer>
			<key>idVendor</key>
			<integer>1452</integer>
		</dict>
	</dict>

You want to set the following properties to match your device

bConfigurationValue
bInterfaceNumber
bcdDevice
idProduct
idVendor

Save the file and build the kext.

rich kubota

If anybody has pointers on how to write such a kext I would appreciate it.

-Ben

On Aug 15, 2005, at 5:45 PM, Raleigh Ledet wrote:

 Ben,

  I thought that the
 kIOHIDOptionsTypeSeizeDevice was supposed to be able to grab control from
 everyone else...?

If you think about it, letting any software grab control of the device at any time would be a bad thing. For instance, you don't want some other app coming along and Seizing the device after you seized it. (Particularly if you are in the middle of an important read.)

I would venture to guess that the Griffin driver is already opening the device for exclusive use. If that's the case, all you can do is either not install the Griffin driver, or write your own kext that matches at a lower level and can selectively route the data to your app or back up the normal IO chain to the griffin driver.

You should, however, be getting either a kIOReturnExclusiveAccess, or kIOReturnNotPrivileged errors. Do you get back a different error if you try to open the device normally?

 -raleigh

 -----------------------------------------------
 Raleigh Ledet, <email@hidden>
 Wacom Technology Corp.
 Mac Software Engineer

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--
Sincerely,
Rich Kubota
email@hidden
(408) 974-6212
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