WdfInterruptReportInactive function (wdfinterrupt.h)

Artikel
04/18/2022

[Applies to KMDF only]

The WdfInterruptReportInactive method informs the system that the interrupt is no longer active and the driver is not expecting interrupt requests on the associated lines.

Syntax

void WdfInterruptReportInactive(
  [in] WDFINTERRUPT Interrupt
);

Parameters

[in] Interrupt

A handle to a framework interrupt object.

Return value

None

Remarks

Only drivers that implement functional state power management call WdfInterruptReportInactive.

When a driver calls WdfInterruptReportInactive, the power management framework (PoFx) can then perform related power management tasks.

Typically, a driver calls WdfInterruptReportInactive from either its ComponentIdleConditionCallback routine, or from ComponentIdleStateCallback when State is greater than zero (indicating a low-power Fx state).

If your driver calls this method on an operating system earlier than Windows 8, the framework's verifier reports an error.

Examples

The following example shows how a driver might call WdfInterruptReportInactive from the ComponentIdleStateCallback routine of a KMDF driver. The driver registers a single component by calling WdfDeviceWdmAssignPowerFrameworkSettings.

VOID
MyComponentIdleStateCallback(
    _In_ PVOID Context,
    _In_ ULONG Component,
    _In_ ULONG State
    )
{
    PFDO_DEVICE_DATA deviceData;
    PFDO_INTERRUPT_CONTEXT interruptContext;

    deviceData = FdoGetData((WDFDEVICE)Context);
    interruptContext = InterruptGetData(deviceData->Interrupt);

    switch (State) {
        case 0:
             …
            break;

        //
        // PoFx may make us go to any of the F-states directly, hence we execute
        // F0Exit code for all of the Fx states. Note that transition to any Fx 
        // state happens from F0 (and not another Fx state).
        //
        default:
            //
            // Disable interrupt generation at hardware if needed.
            // 
            WdfInterruptAcquireLock(deviceData->Interrupt);
            DisableInterruptInHardware();
            WdfInterruptReleaseLock(deviceData->Interrupt);

            //
            // Report that interrupt is now inactive.
            //
            WdfInterruptReportInactive(deviceData->Interrupt);

            interruptContext->ReportedInactive = TRUE;

        break;

    …

}

Requirements

Requirement	Value
Minimum supported client	Windows 8
Target Platform	Universal
Minimum KMDF version	1.11
Header	wdfinterrupt.h (include Wdf.h)
Library	Wdf01000.sys (see Framework Library Versioning.)
IRQL	<=DISPATCH_LEVEL
DDI compliance rules	DriverCreate(kmdf)

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