Developing Drivers with the Windows® Driver Foundation

Plug and Play and Power Management Support in WDF

WDF implements Plug and Play and power management with several internal state machines. Both KMDF and UMDF use the same state machines. An event is associated with the specific actions that a driver might be required to perform at a particular time, and the driver implements the event callbacks to perform the actions that its device requires. The callbacks are called in a defined order and each conforms to a “contract,” so that both the device and the system are guaranteed to be in a particular state when the driver is called to perform an action.

Plug and Play and Power Management Defaults

Although WDF provides great flexibility so that a driver can control detailed aspects of its device’s Plug ...