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Kmdf Hid Minidriver For Touch I2c Device Calibration Best

Implement I2CReadRegister() and I2CWriteRegister() using WdfIoTargetSendI2cWriteRead .

The Touch Controller reports raw ADC values. The KMDF driver applies the math before reporting up to HIDClass.sys . kmdf hid minidriver for touch i2c device calibration best

: Create I/O queues to receive requests passed from the class driver. Implement an EvtIoDeviceControl callback to handle specific HID Minidriver IOCTLs relevant to touch data. Virtual HID Framework (VHF) : For advanced implementations, consider using the Virtual HID Framework (VHF) to report touch data through a HID report descriptor. Microsoft Learn Calibration Best Practices : Create I/O queues to receive requests passed

Send the system to S3 (Sleep) and S4 (Hibernate). When resuming, your driver’s EvtDeviceD0Entry must reload calibration from the registry and reinitialize the I2C device faster than 100 ms. Slow resume breaks Windows Hardware Certification. Microsoft Learn Calibration Best Practices Send the system

// Define the KMDF HID Minidriver's calibration API VOID KMDFHIDCalibrateTouchDevice( _In_ PDEVICE_OBJECT DeviceObject, _In_ PCALIBRATION_DATA CalibrationData ) // Call the calibration function CalibrateTouchDevice(DeviceObject, CalibrationData);

Run !wdfkd.wdfverifier in WinDbg. The best drivers pass all KMDF rule checks (e.g., WdfDeviceInitApi , RequestReuse ). Calibration IOCTLs must never leak WDFREQUEST objects.

Implement I2CReadRegister() and I2CWriteRegister() using WdfIoTargetSendI2cWriteRead .

The Touch Controller reports raw ADC values. The KMDF driver applies the math before reporting up to HIDClass.sys .

: Create I/O queues to receive requests passed from the class driver. Implement an EvtIoDeviceControl callback to handle specific HID Minidriver IOCTLs relevant to touch data. Virtual HID Framework (VHF) : For advanced implementations, consider using the Virtual HID Framework (VHF) to report touch data through a HID report descriptor. Microsoft Learn Calibration Best Practices

Send the system to S3 (Sleep) and S4 (Hibernate). When resuming, your driver’s EvtDeviceD0Entry must reload calibration from the registry and reinitialize the I2C device faster than 100 ms. Slow resume breaks Windows Hardware Certification.

// Define the KMDF HID Minidriver's calibration API VOID KMDFHIDCalibrateTouchDevice( _In_ PDEVICE_OBJECT DeviceObject, _In_ PCALIBRATION_DATA CalibrationData ) // Call the calibration function CalibrateTouchDevice(DeviceObject, CalibrationData);

Run !wdfkd.wdfverifier in WinDbg. The best drivers pass all KMDF rule checks (e.g., WdfDeviceInitApi , RequestReuse ). Calibration IOCTLs must never leak WDFREQUEST objects.

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