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[idd] audio: add mediated broker control endpoint

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Expose a private, versioned control device that lets the IDD discover
and claim the active audio adapter without using the public PortCls
endpoints.

Restrict access to SYSTEM and UMDF hosts, track adapter and binding
generations, and keep broker failure optional. Reserve data-plane
capabilities without advertising them until PCM queues are available.
This commit is contained in:
Geoffrey McRae
2026-09-01 22:42:05 +10:00
parent 7c24b585af
commit c261fa053f
7 changed files with 1281 additions and 5 deletions
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79
idd/LGAudio/Driver.cpp
View File

@@ -20,18 +20,77 @@
#include "Common.h"
#include "Adapter.h"
#include "BrokerDevice.h"
extern "C" DRIVER_INITIALIZE DriverEntry;
namespace
{
PDRIVER_UNLOAD g_portClsUnload = nullptr;
NTSTATUS AddAudioDevice(
_In_ PDRIVER_OBJECT driverObject,
_In_ PDEVICE_OBJECT physicalDeviceObject)
{
constexpr ULONG kSubdeviceCount = 4;
return PcAddAdapterDevice(driverObject, physicalDeviceObject,
StartAudioDevice, kSubdeviceCount, 0);
const NTSTATUS status = PcAddAdapterDevice(driverObject,
physicalDeviceObject, StartAudioDevice, kSubdeviceCount,
kLGAudioPortClsDeviceExtensionSize);
if (NT_SUCCESS(status))
BrokerDeviceNotifyPnpDeviceAdded();
return status;
}
NTSTATUS DispatchIrp(
_In_ PDEVICE_OBJECT deviceObject,
_Inout_ PIRP irp)
{
if (BrokerDeviceIsControlDevice(deviceObject))
return BrokerDeviceDispatch(deviceObject, irp);
PIO_STACK_LOCATION stack = IoGetCurrentIrpStackLocation(irp);
const bool removeDevice =
stack->MajorFunction == IRP_MJ_PNP &&
stack->MinorFunction == IRP_MN_REMOVE_DEVICE;
if (stack->MajorFunction == IRP_MJ_PNP &&
(removeDevice ||
stack->MinorFunction == IRP_MN_STOP_DEVICE ||
stack->MinorFunction == IRP_MN_SURPRISE_REMOVAL))
BrokerDeviceDetachAdapter(deviceObject);
const NTSTATUS status = PcDispatchIrp(deviceObject, irp);
if (removeDevice)
BrokerDeviceNotifyPnpDeviceRemoved();
return status;
}
void DriverUnload(_In_ PDRIVER_OBJECT driverObject)
{
BrokerDeviceShutdown();
if (g_portClsUnload)
g_portClsUnload(driverObject);
}
void InstallDispatchHooks(_In_ PDRIVER_OBJECT driverObject)
{
constexpr UCHAR majors[] =
{
IRP_MJ_CLOSE,
IRP_MJ_CREATE,
IRP_MJ_DEVICE_CONTROL,
IRP_MJ_FLUSH_BUFFERS,
IRP_MJ_PNP,
IRP_MJ_POWER,
IRP_MJ_QUERY_SECURITY,
IRP_MJ_READ,
IRP_MJ_SET_SECURITY,
IRP_MJ_SYSTEM_CONTROL,
IRP_MJ_WRITE,
IRP_MJ_CLEANUP
};
for (const UCHAR major : majors)
driverObject->MajorFunction[major] = DispatchIrp;
}
}
@@ -39,8 +98,22 @@ extern "C" NTSTATUS DriverEntry(
_In_ PDRIVER_OBJECT driverObject,
_In_ PUNICODE_STRING registryPath)
{
return PcInitializeAdapterDriver(driverObject, registryPath,
NTSTATUS status = PcInitializeAdapterDriver(driverObject, registryPath,
AddAudioDevice);
if (!NT_SUCCESS(status))
return status;
g_portClsUnload = driverObject->DriverUnload;
InstallDispatchHooks(driverObject);
driverObject->DriverUnload = DriverUnload;
const NTSTATUS brokerStatus = BrokerDeviceInitialize(driverObject);
if (!NT_SUCCESS(brokerStatus))
{
LGAUDIO_TRACE_ERROR("broker initialization unavailable: 0x%08X",
brokerStatus);
}
return STATUS_SUCCESS;
}
#pragma warning(push)