Kmdf Hid Minidriver For Touch I2c Device Calibration — [portable]

In a KMDF (Kernel-Mode Driver Framework) environment, developers often implement calibration through specific IOCTLs (Input/Output Controls) or registry-based offset tables.

Read the X and Y bytes from the I2C register.

WDF_INTERRUPT_CONFIG interruptConfig; WDF_INTERRUPT_CONFIG_INIT(&interruptConfig, TouchCalibEvtInterruptIsr, TouchCalibEvtInterruptDpc); interruptConfig.PassiveHandling = TRUE; // Allows I2C calls WdfInterruptCreate(Device, &interruptConfig, WDF_NO_OBJECT_ATTRIBUTES, &Interrupt); kmdf hid minidriver for touch i2c device calibration

Implementing the KMDF HID Minidriver for Touch I2C device calibration presents several challenges:

// Clamp to valid range (0–32767 for HID) calX = max(0, min(32767, calX)); calY = max(0, min(32767, calY)); The minidriver forwards the request to the lower

The HID class driver sends IOCTL_HID_READ_REPORT (IRP_MJ_INTERNAL_DEVICE_CONTROL). The minidriver forwards the request to the lower driver (HIDI2C.sys), then modifies the output buffer.

NTSTATUS DeviceAdd(WDFDEVICE Device, PWDFDEVICE_INIT DeviceInit) Implementing Calibration Logic

If your hardware raw values don't match the aspect ratio of the screen, the HID descriptor is where you first define the "Logical" boundaries to prevent initial distortion. 3. Implementing Calibration Logic