Source to iokit/Families/IOHIDSystem/IOHITabletPointer.cpp

Enter a symbol's name here to quickly find it. 
#include <IOKit/hidsystem/IOHITabletPointer.h>

OSDefineMetaClassAndStructors(IOHITabletPointer, IOHIDevice)

UInt16 IOHITabletPointer::generateDeviceID()
{
    static _nextDeviceID = 0;
    return _nextDeviceID++;
}

bool IOHITabletPointer::init( OSDictionary *propTable )
{
    if (!IOHIDevice::init(propTable)) {
        return false;
    }

    _deviceID = generateDeviceID();
    setProperty(kIOHITabletPointerDeviceID, (unsigned long long)_deviceID, 16);

    return true;
}