Touchscreens and other capacitive/precision touch controllers are now standard in laptops, tablets, kiosks, and embedded systems. Making those devices feel smooth and accurate across different units, environments, and physical tolerances requires reliable calibration. For Windows drivers that expose touch controllers through the HID class and communicate over I2C, a KMDF HID minidriver is a common and robust pattern. This article explains the architecture, calibration considerations, and practical implementation patterns for building a KMDF HID minidriver that supports touch I2C device calibration — focusing on reliability, maintainability, and a solid user experience.