Kmdf Hid Minidriver For Touch I2c Device Calibration -

Future minidrivers will need to read EDID from the display panel over DDC/CI and auto-calibrate by matching touch geometry to video timings.

Where (X_touch, Y_touch) are raw ADC/register values from the I2C device, and (X_screen, Y_screen) are the final HID coordinates reported to the OS.

To support runtime calibration (e.g., using a Windows calibration app), the minidriver exposes a custom IOCTL via a PnP device interface. Kmdf Hid Minidriver For Touch I2c Device Calibration

I2C touch devices often exhibit:

Monitor I2C transactions by adding WDF_NO_OBJECT_ATTRIBUTES and WdfIoTargetSendReadSynchronously with a log buffer. Future minidrivers will need to read EDID from

This post explores how the Kernel-Mode Driver Framework (KMDF) interacts with I2C-connected touchscreens and the specific mechanisms used to handle device calibration. 🛠️ The Architecture: KMDF and I2C

Inside the KMDF minidriver, three key components enable calibration: I2C touch devices often exhibit: Monitor I2C transactions

Microsoft introduced HID over I2C to standardize touchpads and touchscreens on mobile and embedded platforms (Windows 8 and later). Instead of writing custom drivers for every touch controller (e.g., from Goodix, Elan, or Cypress), a leverages the HID protocol to report touch coordinates, pressure, and contact IDs using standardized report descriptors.