Filter Driver Enumerates Smartcard Nodes for Plug and Play
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Solution Overview
Problem
Current operating system plug and play frameworks lack automatic recognition of smartcards, rendering them difficult to use and deploy without manual installation of drivers or software, making them unusable until fully installed.
Innovation Solution
Utilization of an upper-level filter driver to enumerate smartcard nodes within the operating system framework, which notifies the smartcard plug and play service of a card insertion, allowing seamless creation of a device node recognized by the operating system, thereby enabling automatic installation and functionality without affecting legacy drivers or applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual installation of drivers or software is required for smartcards, then legacy operating system compatibility is maintained, but ease of operation deteriorates requiring user intervention
Solution Approach 1:
The patent introduces a filter driver as an intermediary component that sits between the smartcard hardware and the operating system. This filter driver automatically creates device nodes and triggers plug and play notifications, serving as a mediator that enables automatic smartcard recognition without requiring manual driver installation while maintaining compatibility with existing operating system architectures.
Solution Approach 2:
The filter driver performs preliminary actions by pre-configuring device nodes and establishing the necessary software infrastructure before the smartcard is actually used. This preliminary setup includes registering the filter driver with the operating system, creating the notification framework, and preparing the device node creation mechanism, so that when a smartcard is inserted, automatic recognition can occur immediately without user intervention.
2Extent of automation
If automatic recognition of smartcards is implemented, then ease of operation improves eliminating manual installation, but device complexity increases requiring filter driver integration
Solution Approach 1:
The filter driver serves as an intermediary layer that implements automatic recognition functionality without fundamentally altering the core operating system. It mediates between the smartcard hardware events and the operating system's plug and play framework, translating hardware insertion events into standardized device node creations and notifications that the operating system can automatically process.
Solution Approach 2:
The filter driver is designed with universal functionality that can handle multiple smartcard types and work with various operating system versions. It provides multi-functional capabilities including device node creation, plug and play notification triggering, and event filtering, all within a single driver component that can be integrated into different operating system environments without requiring separate implementation for each scenario.
3Extent of automation
If filter driver is integrated into operating system, then automatic smartcard enumeration is enabled, but legacy driver compatibility may be affected
Solution Approach 1:
The patent segments the driver architecture into distinct layers: the filter driver layer that handles automatic recognition and device node creation, and the legacy driver layer that maintains existing smartcard functionality. This segmentation allows the filter driver to operate independently above legacy drivers, enabling automatic enumeration while preserving the reliability and compatibility of existing driver implementations without requiring modifications to them.
Data Source
AI summary
Described herein is a filter driver in a smartcardreader class that recognizes the presence of a smartcard in a smartcard reader and creates a device node (devnode).