The touch controller provides raw coordinate data. Your driver must map these to the HID_REPORT structure expected by Windows.
The stack extends further: the I²C controller driver communicates with the actual hardware over the Simple Peripheral Bus (SPB), and General Purpose I/O (GPIO) pins are used to signal interrupts when the device has data ready.
The driver updates its internal transformation matrix and writes the new values to the registry for the next boot. 5. Best Practices for I2C Touch Drivers
Ensure the firmware file is in C:\Windows\System32\drivers\ . kmdf hid minidriver for touch i2c device calibration
: The touch only working in a small box rather than the full screen. 3. Troubleshooting & Calibration Steps
EvtDeviceAdd: - Create WDFQUEUE for I/O requests - Initialize I2C connection via WDF I2C target - Register HID minidriver callbacks (EvtHid...)
When calibration data (e.g., MinX, MaxX, MinY, MaxY) is received, the raw coordinates are normalized: The touch controller provides raw coordinate data
Community-sourced firmware repositories like the gsl-firmware GitHub often provide the correct .fw files for various budget tablets. 4. Use the Built-in Windows Tool
[Version] Signature = "$WINDOWS NT$" Class = HIDClass ClassGuid = 745a17a0-74d3-11d0-b6fe-00a0c90f57da Provider = %ProviderName% CatalogFile = TouchMinidriver.cat DriverVer = 05/25/2026,1.0.0.0 [DestinationDirs] DefaultDestDir = 13 [Manufacturer] %ManufacturerName% = TouchDevice, NTamd64 [TouchDevice.NTamd64] %DeviceDesc% = TouchMinidriver_Install, ACPI\VEN_EXTC&DEV_0001 [TouchMinidriver_Install.NT] CopyFiles = TouchMinidriver_CopyFiles [TouchMinidriver_CopyFiles] TouchMinidriver.sys [TouchMinidriver_Install.NT.HW] AddReg = TouchMinidriver_HW_AddReg [TouchMinidriver_HW_AddReg] HKR,,"UpperFilters",0x00010000,"MSHWDVK" ; Enable Windows integrated touch calibration UI HKR,,"TouchCalibrationEnabled",0x00010001,1 Use code with caution. Registry Paths for Calibration Data
To debug touch coordinate behaviors via an active kernel debugger session, insert dynamic trace points using DbgPrintEx : The driver updates its internal transformation matrix and
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If the hardware-level calibration (Registry/Firmware) is close but not perfect, use the Windows software-level calibration.
Matching ACPI I2C device:
This is the "glue" code. It talks to the I2C controller using the SPB (Simple Peripheral Bus) framework and reports data back to the HID Class Driver.
// Expose HID descriptor (includes calibration collection if present) EVT_HID_DEVICE_GET_DESCRIPTOR EvtHidGetDescriptor;