State Machines in the Framework

To keep track of each device's state, the framework uses a PnP state machine, a power state machine, and a power policy state machine. The framework creates an instance of each state machine for each device that is plugged into a system.

Very few drivers need to be aware of the state of a device's state machines. However, for the drivers that do need to know this information, the framework provides two sets of interfaces:

 

 

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