You need to know exactly where the driver software looks, so it can access data which it uses. Is it somewhere in ram, in a device, in a disk file, in a sensor? Etc.
Or, does the driver already have a built-in routine which looks for a flag, to notify it that it should access your data?
You also need to make sure:
* that your data is available at the time it is needed.
* that nothing overwrites your data beforehand.
* that your data doesn't cause anything to go wrong somewhere.