VOID TouchEvtInternalDeviceControl( _In_ WDFQUEUE Queue, _In_ WDFREQUEST Request, _In_ size_t OutputBufferLength, _In_ size_t InputBufferLength, _In_ ULONG IoControlCode ) WDFDEVICE device = WdfIoQueueGetDevice(Queue); NTSTATUS status = STATUS_SUCCESS; switch (IoControlCode) case IOCTL_HID_SET_FEATURE: PHID_XFER_PACKET packet = NULL; size_t bufferSize; status = WdfRequestRetrieveInputBuffer(Request, sizeof(HID_XFER_PACKET), (PVOID*)&packet, &bufferSize); if (NT_SUCCESS(status)) // Check if Report ID matches our Calibration Report ID (0x02) if (packet->reportId == 0x02 && packet->reportBufferLen > 0) BYTE command = packet->reportBuffer[1]; // Trigger internal calibration sequence based on command token status = ExecuteDeviceCalibrationSequence(device, command); break; default: status = STATUS_NOT_SUPPORTED; break; WdfRequestComplete(Request, status); Use code with caution. 4. Registry-Driven Calibration Configurations
The physical, low-level serial bus protocol connecting the touch controller to the SoC.
Create a KMDF driver skeleton ( DriverEntry , EvtDeviceAdd ). Add I2C resource parsing and interrupt setup. kmdf hid minidriver for touch i2c device calibration best
: Implement GPIO-signaled interrupts to read touch coordinates and calibration statuses asynchronously. 2. Implementing the Calibration Pipeline
Below is a simplified structure of the calibration logic inside your EvtIoDeviceControl handler for IOCTL_TOUCH_CALIBRATE . Create a KMDF driver skeleton ( DriverEntry , EvtDeviceAdd )
Utilize WPP_CONTROL_GUIDS to log raw I2C values and transformed HID values.
Before discussing calibration, you must understand why KMDF + HID over I2C is the gold standard. NTSTATUS I2cSendCalibrationCommand( _In_ WDFDEVICE Device
The required by your system design.
To configure calibration effectively, you must first understand how Windows processes touch packets from an Inter-Integrated Circuit (I2C) peripheral.
NTSTATUS I2cSendCalibrationCommand( _In_ WDFDEVICE Device, _In_ BYTE CalibrationCmdRegister, _In_ BYTE CalibrationPayload ) PDEVICE_CONTEXT pDeviceContext = DeviceGetContext(Device); WDF_MEMORY_DESCRIPTOR inputDescriptor; NTSTATUS status; // Construct the I2C payload packet: [Register Address, Command Value] BYTE writeBuffer[2] = CalibrationCmdRegister, CalibrationPayload ; WdfMemoryDescriptorInitializeBuffer( &inputDescriptor, (PVOID)writeBuffer, sizeof(writeBuffer) ); // Synchronously send the write request down to the SPB controller status = WdfIoTargetSendWriteSynchronously( WdfDeviceGetIoTarget(Device), NULL, &inputDescriptor, NULL, NULL, NULL ); if (!NT_SUCCESS(status)) TraceEvents(TRACE_LEVEL_ERROR, TRACE_DRIVER, "I2C Calibration Write Failed: %!STATUS!", status); return status; Use code with caution. 3. Handling Calibration via HID Feature Reports