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PDX_ENABLEIRQ callback function (dxmini.h)

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The DxEnableIRQ callback function indicates to the video miniport driver which IRQs should be enabled or disabled.

Syntax

PDX_ENABLEIRQ PdxEnableirq;

DWORD PdxEnableirq(
  PVOID unnamedParam1,
  PDDENABLEIRQINFO unnamedParam2,
  PVOID unnamedParam3
)
{...}

Parameters

unnamedParam1

Points to the miniport driver's device extension.

unnamedParam2

Points to the DDENABLEIRQINFO structure that contains the information required to enable interrupts.

unnamedParam3

Reserved for system use.

Return value

DxEnableIRQ returns DX_OK if it succeeds; otherwise, it returns one of the following error values:

Remarks

The dwIRQSources member of the DDENABLEIRQINFO structure at EnableIrqInfo contains the DDIRQ_Xxx flags that are set for every IRQ that should be enabled. If an IRQ is not specified in this call, it should be disabled. If the requested combination cannot be supported, this function fails.

Because the video miniport driver must always manage its own IRQ, it must call the specified IRQCallback when an IRQ occurs. When calling IRQCallback, the dwIRQFlags member of the DX_IRQDATA structure passed to IRQCallback contains the DDIRQ_Xxx flags that indicate what caused the IRQ.

Requirements

Requirement Value
Target Platform Desktop
Header dxmini.h (include Dxmini.h)

See also

DDENABLEIRQINFO

DX_IRQDATA

IRQCallback