In your EvtDevicePrepareHardware , retrieve the I2C connection resources. The I2C target is represented by a WDFIOTARGET .
// Conceptual implementation EVT_WDF_IO_QUEUE_IO_DEVICE_CONTROL EvtIoDeviceControl;
The DPC routine or a continuous reader thread must apply calibration submitting the HID report to the class driver.
switch (ControlCode)
NTSTATUS SendHidReport(WDFDEVICE Device, HID_TOUCH_REPORT *report)
typedef struct _RAW_TOUCH_REPORT UCHAR TouchID; USHORT RawX; USHORT RawY; UCHAR Pressure; RAW_TOUCH_REPORT;
In a KMDF (Kernel-Mode Driver Framework) environment, developers often implement calibration through specific IOCTLs (Input/Output Controls) or registry-based offset tables. kmdf hid minidriver for touch i2c device calibration
I can help break down: Writing the HID Descriptor for multi-touch. Implementing SpbCx for I2C communication. Setting up DPC routines for interrupt handling.
A KMDF HID minidriver for I²C touch calibration provides robust, low-latency correction of touch coordinates without modifying user-space drivers. By intercepting IOCTL_HID_READ_REPORT and applying a transform matrix, it seamlessly integrates into Windows Touch stack. The presented design has been validated on multiple x86/ARM64 tablets with custom touch controllers, reducing touch offset error from ±2mm to <0.5mm after calibration.
prevent users from hitting the Start button or closing windows. Setting up DPC routines for interrupt handling
Developing a KMDF HID minidriver for an I2C touch device with calibration capability is a significant but rewarding engineering effort. It bridges the gap between raw hardware capabilities and the precise, responsive touch experience that Windows users expect.
Your KMDF driver must handle interrupts. When a touch event occurs, the I2C controller asserts an interrupt line. In your EvtInterruptIsr :
[MyTouchCalib.NT.Services] AddService=MyTouchCalib,0x00000002,MyTouchCalib_Service In your EvtDevicePrepareHardware