Kmdf Hid Minidriver For Touch I2c Device Calibration Official
// Write back *(PUSHORT)(Packet->Buffer + X_OFFSET) = (USHORT)calibratedX; *(PUSHORT)(Packet->Buffer + Y_OFFSET) = (USHORT)calibratedY;
NTSTATUS EvtHidDeviceReadReport(DEVICE_OBJECT *DeviceObject, PHID_XFER_PACKET Packet) Kmdf Hid Minidriver For Touch I2c Device Calibration
| Method | Storage Location | Read Access in Driver | Use Case | |--------|----------------|----------------------|-----------| | | \_SB.I2C0.TS1.CALX , CALY | IoGetDeviceProperty + ACPI parser | Firmware-defined, immutable | | Registry | HKLM\SYSTEM\CurrentControlSet\...\Parameters | RtlQueryRegistryValues | User-modifiable, dynamic | | Private IOCTL | Passed from service | EvtIoDeviceControl | Live calibration from UI app | we assume a simple linear mapping:
[ User Mode ] Touch API (WM_POINTER) ↑ [ Kernel Mode ] HID Class Driver (hidclass.sys) ↑ HID Transport Minidriver (Your Driver) ↑ KMDF I2C Lower Filter / HIDI2C Shim ↑ I2C Controller Driver (SpbCx) Your minidriver must implement the HID_DEVICE_EXTENSION structure and callback functions defined in hidport.h . However, for I2C calibration, we typically implement a (using HID_TRANSPORT_MINIDRIVER_REGISTRATION ) that attaches to the existing HID-I2C transport. 3. The Calibration Model: Linear Transformation Touchscreen calibration is a projective transformation. For most industrial I2C devices, we assume a simple linear mapping: // Write back *(PUSHORT)(Packet->
