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A device driver is software that allows hardware devices to operate the way they should. For example, a printer driver tells the printer what to do and how to do it. It confirms the connection between the device and the computer itself that allows the computer user to do those things he expects the device to do.
The power manager instructs drivers when to prepare their devices to enter a low-power mode, and drivers receive notification from the power manager when their devices are turned back on. Drivers are responsible for reporting their power capabilities to the power manager. Drivers have the option of detecting when their devices are idle (and can be switched to a low-power mode) or relying on the power manager for such detection.