Method createMatchingDictionary

USBToolBox/USBToolBox.cpp:22–112

OSDefineMetaClassAndStructors(USBToolBox, IOService)

OSDictionary* USBToolBox::createMatchingDictionary() {
    char pciDevicePath[PARENT_PATH_LENGTH] = { 0 };
    int pciDevicePathLength = sizeof(pciDevicePath);
    
    bool pciDevicePathStatus = pciDevice->getPath(pciDevicePath, &pciDevicePathLength, gIOServicePlane);
    
    if (!pciDevicePathStatus) {
        SYSTEMLOGPROV("Failed to get PCI device path!");
        return NULL;
    } else {
        DEBUGLOGPROV("Path is %s, length %d", pciDevicePath, pciDevicePathLength);
    }
    
    OSString* pciDevicePathString = OSString::withCString(pciDevicePath);
    
    if (!pciDevicePathString) {
        SYSTEMLOGPROV("Failed to create OSString of PCI device path!");
        return NULL;
    }
    
    const OSSymbol* pathMatchKey = OSSymbol::withCString("IOPathMatch");
    
    if (!pathMatchKey) {
        SYSTEMLOGPROV("Failed to create path match key!");
        OSSafeReleaseNULL(pciDevicePathString);
        return NULL;
    }
    
    const OSObject* parentMatchObjects[] {pciDevicePathString};
    const OSSymbol* parentMatchSymbols[] {pathMatchKey};
    
    OSDictionary* parentMatch = OSDictionary::withObjects(parentMatchObjects, parentMatchSymbols, 1);
    
    OSSafeReleaseNULL(pathMatchKey);
    OSSafeReleaseNULL(pciDevicePathString);
    
    if (!parentMatch) {
        SYSTEMLOGPROV("Failed to create parent match dict!");
        return NULL;
    }
    
    OSDictionary* matchingDict = serviceMatching("AppleUSBHostController");
    
    if (!matchingDict) {
        SYSTEMLOGPROV("Failed to create matching dict!");
        OSSafeReleaseNULL(parentMatch);
        return NULL;
    }
    
    bool setParentMatchStatus = matchingDict->setObject("IOParentMatch", parentMatch);
    
    OSSafeReleaseNULL(parentMatch);
    
    if (!setParentMatchStatus) {
        SYSTEMLOGPROV("Failed to set parent match!");
        OSSafeReleaseNULL(matchingDict);
        return NULL;
    }