If you are resolving physical alignment anomalies, we can detail how to to calculate values for the Scale and Offset registers automatically. Share public link
Avoid KeWaitForSingleObject in read completion path.
Windows natively supports I2C HID devices via the built-in HIDI2C.sys class driver. However, custom hardware often requires a dedicated KMDF HID minidriver to handle unique initialisation sequences, vendor-specific commands, or proprietary calibration algorithms. kmdf hid minidriver for touch i2c device calibration
NTSTATUS TouchMinidriverEvtDeviceAdd( _In_ WDFDRIVER Driver, _Inout_ PWDFDEVICE_INIT DeviceInit ) NTSTATUS status; WDF_OBJECT_ATTRIBUTES deviceAttributes; WDFDEVICE wdfDevice; PDEVICE_CONTEXT deviceContext; WDF_IO_QUEUE_CONFIG queueConfig; UNREFERENCED_PARAMETER(Driver); // Bind driver to HID Class status = HidRegisterMinidriver(DeviceInit); if (!NT_SUCCESS(status)) return status; WDF_OBJECT_ATTRIBUTES_INIT_CONTEXT_TYPE(&deviceAttributes, DEVICE_CONTEXT); status = WdfDeviceCreate(&DeviceInit, &deviceAttributes, &wdfDevice); if (!NT_SUCCESS(status)) return status; deviceContext = GetDeviceContext(wdfDevice); // Default factory parameters (Example values) deviceContext->MaxX = 4096; deviceContext->MaxY = 4096; deviceContext->CalibrationOffsetX = 10; // Dynamic offset correction deviceContext->CalibrationOffsetY = -15; // Dynamic offset correction deviceContext->CalibrationScaleX = 1.02; // Scale adjustment factor deviceContext->CalibrationScaleY = 0.98; // Scale adjustment factor // Configure the internal queue to intercept HID requests WDF_IO_QUEUE_CONFIG_INIT_DEFAULT_QUEUE(&queueConfig, WdfIoQueueDispatchParallel); queueConfig.EvtIoInternalDeviceControl = TouchMinidriverEvtInternalDeviceControl; status = WdfIoQueueCreate(wdfDevice, &queueConfig, WDF_NO_OBJECT_ATTRIBUTES, WDF_NO_HANDLE); return status; Use code with caution. 3. Intercepting HID Reports and Applying Calibration
+---------------------------------------------------------+ | Windows Touch User Mode | +---------------------------------------------------------+ | +---------------------------------------------------------+ | HIDCLASS.SYS (Class Driver) | +---------------------------------------------------------+ | +---------------------------------------------------------+ | Your KMDF HID Minidriver (Custom Business Logic) | +---------------------------------------------------------+ | +---------------------------------------------------------+ | SPB stream (Spb驱动 / I2C Controller) | +---------------------------------------------------------+ | +---------------------------------------------------------+ | Hardware Touch IC | +---------------------------------------------------------+ If you are resolving physical alignment anomalies, we
Pass the Windows Hardware Lab Kit tests specifically for:
The KMDF HID minidriver is a type of kernel-mode driver that uses the Kernel-Mode Driver Framework (KMDF) to interact with the operating system. The minidriver is designed to work with HID devices, which include touchscreens, touchpads, and other human interface devices. However, custom hardware often requires a dedicated KMDF
: Windows stores specific calibration results in the registry at: HKEY_LOCAL_MACHINE\HARDWARE\DEVICEMAP\TOUCH\CalibrationData . Implementation and Troubleshooting
Kernel-mode code does not natively utilize floating-point operations without saving and restoring the FPU state—a costly operation in an interrupt path. Use fixed-point integer arithmetic instead to maintain precision and execution speed.