From 29b50034559837307dff57cf588c34bfef73f239 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Herv=C3=A9=20Poussineau?= <hpoussin@reactos.org>
Date: Thu, 1 May 2025 13:44:21 +0200
Subject: [PATCH] [VIDEOPRT] Implement IOCTL_VIDEO_ENUM_MONITOR_PDO

---
 win32ss/drivers/videoprt/dispatch.c | 51 +++++++++++++++++++++++++++--
 1 file changed, 49 insertions(+), 2 deletions(-)

diff --git a/win32ss/drivers/videoprt/dispatch.c b/win32ss/drivers/videoprt/dispatch.c
index 79a20481b91..f07a951eb0d 100644
--- a/win32ss/drivers/videoprt/dispatch.c
+++ b/win32ss/drivers/videoprt/dispatch.c
@@ -622,6 +622,51 @@ VideoPortUseDeviceInSession(
     return STATUS_SUCCESS;
 }
 
+static
+NTSTATUS
+VideoPortEnumMonitorPdo(
+    _In_ PDEVICE_OBJECT DeviceObject,
+    _Inout_ PVIDEO_MONITOR_DEVICE *ppMonitorDevices,
+    _Out_ PULONG_PTR Information)
+{
+    PVIDEO_MONITOR_DEVICE pMonitorDevices;
+    PVIDEO_PORT_DEVICE_EXTENSION DeviceExtension = DeviceObject->DeviceExtension;
+    PVIDEO_PORT_CHILD_EXTENSION ChildExtension;
+    ULONG i;
+    PLIST_ENTRY CurrentEntry;
+
+    /* Count the children */
+    i = 0;
+    CurrentEntry = DeviceExtension->ChildDeviceList.Flink;
+    while (CurrentEntry != &DeviceExtension->ChildDeviceList)
+    {
+        i++;
+        CurrentEntry = CurrentEntry->Flink;
+    }
+
+    pMonitorDevices = ExAllocatePoolZero(PagedPool,
+                                         sizeof(VIDEO_MONITOR_DEVICE) * (i + 1),
+                                         TAG_VIDEO_PORT);
+    if (!pMonitorDevices)
+        return STATUS_INSUFFICIENT_RESOURCES;
+
+    /* Add the children */
+    i = 0;
+    CurrentEntry = DeviceExtension->ChildDeviceList.Flink;
+    while (CurrentEntry != &DeviceExtension->ChildDeviceList)
+    {
+        ChildExtension = CONTAINING_RECORD(CurrentEntry, VIDEO_PORT_CHILD_EXTENSION, ListEntry);
+
+        ObReferenceObject(ChildExtension->PhysicalDeviceObject);
+        pMonitorDevices[i++].pdo = ChildExtension->PhysicalDeviceObject;
+        CurrentEntry = CurrentEntry->Flink;
+    }
+
+    *ppMonitorDevices = pMonitorDevices;
+    *Information = sizeof(pMonitorDevices);
+    return STATUS_SUCCESS;
+}
+
 static
 NTSTATUS
 VideoPortInitWin32kCallbacks(
@@ -791,8 +836,10 @@ IntVideoPortDispatchDeviceControl(
             break;
 
         case IOCTL_VIDEO_ENUM_MONITOR_PDO:
-            WARN_(VIDEOPRT, "- IOCTL_VIDEO_ENUM_MONITOR_PDO is UNIMPLEMENTED!\n");
-            Status = STATUS_NOT_IMPLEMENTED;
+            INFO_(VIDEOPRT, "- IOCTL_VIDEO_ENUM_MONITOR_PDO\n");
+            Status = VideoPortEnumMonitorPdo(DeviceObject,
+                                             Irp->AssociatedIrp.SystemBuffer,
+                                             &Irp->IoStatus.Information);
             break;
 
         case IOCTL_VIDEO_INIT_WIN32K_CALLBACKS: