Re: IOAudioDevice Subclass KEXT not calling initHardware
Re: IOAudioDevice Subclass KEXT not calling initHardware
- Subject: Re: IOAudioDevice Subclass KEXT not calling initHardware
- From: Jeff Moore <email@hidden>
- Date: Mon, 13 Nov 2006 18:56:38 -0800
First off, the PhantomAudioDriver sample code was obsoleted a while
back with the introduction of the AudioReflectorDriver in the
CoreAudio SDK. You can find it on an OS X system in /Developer/
Examples/CoreAudio/HAL/AudioReflectorDriver.
Also, if you have audio specific questions, as opposed to general
kernel development questions, you should check out the CoreAudio-API
mailing list on lists.apple.com.
All that said, your current problem sounds to me like your driver
isn't matching anything and so none of your kext's classes are being
instantiated. Your matching information should be in the
"IOKitPersonalities" dictionary of your kext's info.plist. Chances are
that you lost that info in the shuffle from the original project to
your freshly built project. As such, you should check over all the
data in the info.plist file just to be sure it got transferred over
correctly.
On Nov 13, 2006, at 6:28 PM, Jason Williams wrote:
Now I posted earlier this month about building the example project
for a dummy IOAudioDevice. I got it to build, so I've gone on to
the next step which is to build my own modified version. I
basically copied most of the code from PhantomAudioDriver, which is
what builds and loads, and put in some simple stuff for an example
AudioEngine, and built it. I've gotten it as far as building
perfectly, so it seems, and loading it into the kernel with
kextload. Ran kextload with -t and all looks well. kextstat even
shows the driver loaded.
Problem is, I put some debug log lines in initHardware in the
IOAudioDevice subclass, and nothing is coming out. Nor does my
device show up in the audio output pane in system prefs. The
difference is that I started with a clean Xcode Kernel EXT project
for the new version so I could understand the settings that went
into building a KEXT. According to the docs, when the kext is
loaded, the start() function on the super class calls initHardware
on the subclass. But it seems to not be doing so. Any thoughts/
Ideas/Suggestions on where to look? I'm guessing it's a setting or
a something I am just missing, but I made sure I had everything set
right like it is on the PhantomAudioDriver, but to no avail.
--
Jeff Moore
Core Audio
Apple
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