Power Manager Device Driver Functions (Compact 2013)

  • Article

3/26/2014

Power Manager-aware device drivers use the following functions to request service from Power Manager.

Device Driver Functions

Function

Description

DevicePowerNotify

Used by device drivers to request Power Manager to update their device power states.

RegisterPowerRelationship

Used by bus drivers and other proxy power managers to intercept all power IOCTLs for a device.

ReleasePowerRelationship

Terminates the proxy relationship initiated by a call to RegisterPowerRelationship.

PowerPolicyNotify

Notifies Power Manager of the events required for implementing a power policy.

Typically, device drivers call the Power Manager DevicePowerNotify function to request device power state changes. Keyboard, keypad, and battery drivers typically call the PowerPolicyNotify function to notify Power Manager of events through message flags. For example, a keypad driver sends the PPN_POWERBUTTONPRESSED message to notify Power Manager when the power button is pressed.

See Also

Concepts

Power Management Device Driver Interface