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Class Driver & MiniDriver Definition_minidriver classdriver
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Class Driver and Minidriver Definitions
A Microsoft-provided class driver is an intermediate driver designed to provide a simple interface between a vendor-written minidriver and the operating system. A minidriver is a hardware-specific DLL that uses a Microsoft-provided class driver to accomplish most actions through function calls, and provides only device-specific controls.minidriver is composited by callback functions.
Under WDM, the minidriver registers its associated hardware adapters with the class driver, and the class driver creates a file object to represent each adapter that registers. The minidriver uses the class driver's device object to make system calls. The class driver is accessed by user-mode clients through WDM Streaming.
The interactions between class driver and minidriver include:
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The minidriver does not create a device object, but shares the class driver's device object as necessary. This saves system resources.
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Only one device object is created per adapter. Multiple subdevices (called streams) supported by the adapter are represented by WDM Streaming pins.
