Okay. So my plan is to use an interface driver which returns false from
start() if my app is running. If a device is already present when the app
starts up then I'll just call USBDeviceReEnumerate() or SetConfiguration()
on it.
The only problem is I can't see an easy way for the app to tell the driver
that it is running, since the driver won't yet be in the IORegistry and
never will be if it keeps returning false from start(). Should I match my
driver against IOResources so I can IORegistryEntrySetCFProperties() on it?
Out of interest, can kexts read preferences?
Steve
> From: Shaun Wexler <email@hidden>
> Date: Thu, 24 Mar 2005 17:29:57 -0800
> To: USB mailing list <email@hidden>
> Subject: Re: Acquiring an interface from AppleUSBAudio
>
> On Mar 24, 2005, at 5:23 PM, Steve West wrote:
>
>> As has been discussed on this list, a codeless kext can prevent the Apple
>> audio driver from matching a particular interface. My question is: Can this
>> be done on the fly? I have tried USBInterfaceOpenSeize() but AppleUSBAudio
>> does not appear to honor it.
>
> The way I did it was to have my USBDevice driver set the configuration,
> but use false so it wouldn't begin matching the device, then attach my
> driver and force-match it to the USBInterface. Ugly but effective.
> Then I learned that I'd been matched but a syntax-colorization bug in
> Xcode was obfuscating some brackets as comments, and in fact it was
> returning false from ::start. ;)
> --
> Shaun Wexler
> MacFOH
> http://www.macfoh.com
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