Kmdf Hid Minidriver For Touch I2c Device Calibration Jun 2026

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VOID TouchEvtIoDeviceControl( _In_ WDFQUEUE Queue, _In_ WDFREQUEST Request, _In_ size_t OutputBufferLength, _In_ size_t InputBufferLength, _In_ ULONG IoControlCode ) NTSTATUS status = STATUS_INVALID_DEVICE_REQUEST; PDEVICE_CONTEXT devContext = GetDeviceContext(WdfQueueGetDevice(Queue)); PVOID inputBuffer; UNREFERENCED_PARAMETER(OutputBufferLength); switch (IoControlCode) case IOCTL_SET_TOUCH_CALIBRATION: if (InputBufferLength < sizeof(CALIBRATION_DATA_STRUCT)) status = STATUS_BUFFER_TOO_SMALL; break; status = WdfRequestRetrieveInputBuffer(Request, sizeof(CALIBRATION_DATA_STRUCT), &inputBuffer, NULL); if (NT_SUCCESS(status)) PCALIBRATION_DATA_STRUCT pData = (PCALIBRATION_DATA_STRUCT)inputBuffer; // Atomically update calibration matrix parameters devContext->AlphaA = pData->A; devContext->AlphaB = pData->B; devContext->AlphaC = pData->C; devContext->AlphaD = pData->D; devContext->AlphaE = pData->E; devContext->AlphaF = pData->F; devContext->Divisor = pData->Divisor; devContext->IsCalibrated = TRUE; status = STATUS_SUCCESS; break; WdfRequestComplete(Request, status); Use code with caution. 7. Performance Optimization and Verification

This is critical for systems where the touch panel is bonded to a specific display module in the factory. kmdf hid minidriver for touch i2c device calibration

The actual size of the panel in millimeters. Usage Page: Digitizers (0x0D). Usage: Touch Screen (0x04).

The handler validates input, updates driver’s calibration structure, saves to registry, and optionally applies it to the hardware. This public link is valid for 7 days

The INF must mark the driver as a and declare HID class as upper filter:

Convert the raw data to the Logical Maximum defined in your HID descriptor. Offset Correction Can’t copy the link right now

If calibration becomes corrupted, use the Reset button in the same menu to clear the registry data and return to the driver's default mapping. 4. Verify HID Report Descriptors

X_cal = a*X_raw + b*Y_raw + c Y_cal = d*X_raw + e*Y_raw + f Solved via least squares from known display points.