'MacOS Configure the FrameBuffer as a UserClient

I am looking to update an existing kext which simple opens the IOFrameBuffer and modifies the configuration via a call to setAttributeForConnection(). I believe that a kext is no longer needed as I can connect to the Frame Buffer service as a user client via the following call:

ret = IOServiceOpen("AMDFrameBuferVIB", 
                    mach_task_self_,
                    kIOFBSharedConnectType, &connection);

With the connection I assume that I now need to call an IOConnectCallXXX() method to to change a single property but I cannot work out how to make a call that is the equivalent of the kext call:

    // attempt to configure via a call to setAttribulteForConnection
    framebuffer->setAttributeForConnection(0, SOME_SETTING, 0);

So far I have been unable to find any documentation on Frame Buffer connections. Is there a list of functions I can call using the connection supplied by the call to IOServiceOpen()

macosframebufferkernel-extensiondriverkit


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