WdfDeviceSetPowerCapabilities method

The WdfDeviceSetPowerCapabilities method reports a device's power capabilities.

Syntax

VOID WdfDeviceSetPowerCapabilities(
  [in]  WDFDEVICE Device,
  [in]  PWDF_DEVICE_POWER_CAPABILITIES PowerCapabilities
);

Parameters

Device [in]

A handle to a framework device object.

PowerCapabilities [in]

A pointer to a driver-allocated WDF_DEVICE_POWER_CAPABILITIES structure.

Return value

None.

A bug check occurs if the driver supplies an invalid object handle.

Remarks

A driver typically calls WdfDeviceSetPowerCapabilities from within one of the following callback functions:

• EvtDriverDeviceAdd

• EvtDevicePrepareHardware

• EvtDeviceD0Entry (if the PreviousState parameter's value is WdfPowerDeviceD3Final)

• EvtDeviceSelfManagedIoInit

• EvtChildListCreateDevice

If more than one driver in the device's driver stack call WdfDeviceSetPowerCapabilities, the power manager uses the values that are supplied by the driver that is highest in the stack.

Examples

The following code example initializes a WDF_DEVICE_POWER_CAPABILITIES structure and then calls WdfDeviceSetPowerCapabilities.

WDF_DEVICE_POWER_CAPABILITIES powerCaps;

WDF_DEVICE_POWER_CAPABILITIES_INIT(&powerCaps);
powerCaps.DeviceD1 = WdfTrue;
powerCaps.WakeFromD1 = WdfTrue;
powerCaps.DeviceWake = PowerDeviceD1;
powerCaps.DeviceState[PowerSystemWorking] = PowerDeviceD1;
powerCaps.DeviceState[PowerSystemSleeping1] = PowerDeviceD1;
powerCaps.DeviceState[PowerSystemSleeping2] = PowerDeviceD2;
powerCaps.DeviceState[PowerSystemSleeping3] = PowerDeviceD2;
powerCaps.DeviceState[PowerSystemHibernate] = PowerDeviceD3;
powerCaps.DeviceState[PowerSystemShutdown] = PowerDeviceD3;

WdfDeviceSetPowerCapabilities(
                              device,
                              &powerCaps
                              );

Requirements

See also

WdfDeviceSetPnpCapabilities

WDF_DEVICE_POWER_CAPABILITIES

WDF_DEVICE_POWER_CAPABILITIES_INIT

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Build date: 4/23/2013