Kmdf Hid Minidriver For Touch I2c Device Calibration __hot__

This runs when the device powers up. This is the critical moment to apply calibration, as I2C devices often lose register state on power loss.

// Assuming HID report format: TipSwitch(1), X(2), Y(2), Pressure(2) if (len < 7) return; USHORT rawX = (USHORT )(report + 1); USHORT rawY = (USHORT )(report + 3); kmdf hid minidriver for touch i2c device calibration

switch (IoControlCode) case IOCTL_SET_CALIBRATION: CALIBRATION_DATA newCal; WdfRequestRetrieveInputBuffer(Request, sizeof(newCal), &newCal, NULL); // Apply and persist g_Calibration = newCal; SaveToRegistry(Device, &g_Calibration); WdfRequestComplete(Request, STATUS_SUCCESS); break; default: WdfRequestComplete(Request, STATUS_INVALID_DEVICE_REQUEST); This runs when the device powers up