Kmdf Hid Minidriver For Touch I2c Device Calibration Jun 2026

Send the processed HID report up the stack via WdfRequestComplete . 5. Storing Calibration Data

The driver schedules a read operation over the I2C bus.

Modern computing devices (tablets, laptops, all-in-ones) increasingly rely on I²C-connected touch controllers. While Windows provides the HIDI2C.sys class driver for standard HID-over-I²C devices, many low-cost or legacy touch controllers require proprietary calibration routines that are not supported by the generic class driver. This paper presents the architecture of a Kernel-Mode Driver Framework (KMDF) HID Minidriver that intercepts HID reports from an I²C touch device, injects calibration coefficients, and provides a clean HID interface to the operating system’s touch input stack. We focus on calibration data persistence, vendor-specific command handling, and seamless integration with Windows Touch (Precision Touchpad and Digitizer). kmdf hid minidriver for touch i2c device calibration

: Interprets raw I2C touch data (X/Y coordinates, pressure, finger count) and translates it into HID reports that the Windows OS can understand.

I2C touch controllers report raw ADC values or simple X/Y coordinates. Without calibration, errors emerge from: Send the processed HID report up the stack

// Pack the command writeBuffer[0] = TOUCH_CMD_SET_CALIBRATION; RtlCopyMemory(&writeBuffer[1], CalibData, sizeof(TOUCH_CALIBRATION_DATA));

This write‑up focuses on implementation for maximum calibration control. Configuration and Registry Settings

WDF_MEMORY_DESCRIPTOR desc; UCHAR buffer[2] = reg, value; WDF_MEMORY_DESCRIPTOR_INIT_BUFFER(&desc, buffer, 2); WDF_REQUEST_SEND_OPTIONS options; WDF_REQUEST_SEND_OPTIONS_INIT(&options, WDF_REQUEST_SEND_OPTION_SYNCHRONOUS);

WDF_DRIVER_CONFIG config; WDF_DRIVER_CONFIG_INIT(&config, DeviceAdd); return WdfDriverCreate(DriverObject, RegistryPath, WDF_NO_OBJECT_ATTRIBUTES, &config, WDF_NO_HANDLE);

The driver pulls raw data from the I2C bus and recalculates the coordinates in real time using a 2D transformation matrix before sending the packet to HIDClass.sys . This is ideal when the touch controller firmware cannot store persistent calibration profiles. Configuration and Registry Settings