WdfCmResourceListGetCount(ResourcesRaw); returns 0

[Lokesh Venkataramappa]

Hello All

I am working on Intel E3900 apollo lake based processor. Where I am running a KMDF driver on Windows IOT Core OS.

Using KMDF I am trying to access Hardware resources using MmMapIoSpace(); APIs. However "wdfcmresourcelistgetcount" function call returning a ZERO. I have created a PnPCallback for PrepareHardware function and calling the wdfcmresourcelistgetcount function. Below is the code snippet, can someone point what I am doing wrong.

NTSTATUS
USBDriver1EvtDevicePrepareHardware(
_In_ WDFDEVICE Device,
_In_ WDFCMRESLIST ResourcesRaw,
_In_ WDFCMRESLIST ResourcesTranslated
)

{
NTSTATUS Status;
ULONG ResCount;
ULONG ResIndex;
PCONTROLLER_CONTEXT ControllerContext;
BOOLEAN MemoryResourceMapped;

PAGED_CODE();

// TraceEntry();
//TraceEvents(TRACE_LEVEL_INFORMATION, TRACE_DRIVER, "%!FUNC! Entry");

ControllerContext = DeviceGetControllerContext(Device);
MemoryResourceMapped = FALSE;

ResCount = WdfCmResourceListGetCount(ResourcesRaw);

ResCount1 = WdfCmResourceListGetCount(ResourcesTranslated);
Status = STATUS_SUCCESS;

for (ResIndex = 0; ResIndex < ResCount; ResIndex++) {

PCM_PARTIAL_RESOURCE_DESCRIPTOR ResourceDescriptorRaw;
PCM_PARTIAL_RESOURCE_DESCRIPTOR ResourceDescriptorTranslated;

ResourceDescriptorRaw = WdfCmResourceListGetDescriptor(
ResourcesRaw,
ResIndex);
switch (ResourceDescriptorRaw->Type) {

case CmResourceTypeMemory:
if (MemoryResourceMapped == FALSE) {
MemoryResourceMapped = TRUE;
Status = RegistersCreate(Device, ResourceDescriptorRaw);
// CHK_NT_MSG(Status, "Failed to read the HW registers");
}
break;

case CmResourceTypeInterrupt:
ResourceDescriptorTranslated = WdfCmResourceListGetDescriptor(
ResourcesTranslated,
ResIndex);
/* Status = InterruptCreate(
Device,
ResourceDescriptorRaw,
ResourceDescriptorTranslated);*/
// CHK_NT_MSG(Status, "Failed to create WDFINTERRUPT object");
break;

default:
break;
}
}

NT_ASSERT(ControllerContext->DeviceInterrupt != NULL);

//End:
// TraceExit();
return STATUS_SUCCESS;
}


Looking forward to get the solution


Thank you & Regards

Lokesh

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