From cba5674d60fead86bd6f0a8c6770d6063697f927 Mon Sep 17 00:00:00 2001
From: Zebediah Figura <z.figura12@gmail.com>
Date: Wed, 6 Nov 2019 23:54:58 -0600
Subject: [PATCH] winebus.sys: Implement AddDevice().

Signed-off-by: Zebediah Figura <z.figura12@gmail.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
---
 dlls/winebus.sys/main.c | 65 ++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 64 insertions(+), 1 deletion(-)

diff --git a/dlls/winebus.sys/main.c b/dlls/winebus.sys/main.c
index 98ed890af89..bffd9b8f5f8 100644
--- a/dlls/winebus.sys/main.c
+++ b/dlls/winebus.sys/main.c
@@ -88,6 +88,9 @@ static DRIVER_OBJECT *driver_obj;
 
 static DEVICE_OBJECT *mouse_obj;
 
+/* The root-enumerated device stack. */
+static DEVICE_OBJECT *bus_pdo, *bus_fdo;
+
 HANDLE driver_key;
 
 struct pnp_device
@@ -490,7 +493,33 @@ static NTSTATUS handle_IRP_MN_QUERY_ID(DEVICE_OBJECT *device, IRP *irp)
     return status;
 }
 
-static NTSTATUS WINAPI common_pnp_dispatch(DEVICE_OBJECT *device, IRP *irp)
+static NTSTATUS fdo_pnp_dispatch(DEVICE_OBJECT *device, IRP *irp)
+{
+    IO_STACK_LOCATION *irpsp = IoGetCurrentIrpStackLocation(irp);
+    NTSTATUS ret;
+
+    switch (irpsp->MinorFunction)
+    {
+    case IRP_MN_START_DEVICE:
+    case IRP_MN_SURPRISE_REMOVAL:
+        irp->IoStatus.u.Status = STATUS_SUCCESS;
+        break;
+    case IRP_MN_REMOVE_DEVICE:
+        irp->IoStatus.u.Status = STATUS_SUCCESS;
+        IoSkipCurrentIrpStackLocation(irp);
+        ret = IoCallDriver(bus_pdo, irp);
+        IoDetachDevice(bus_pdo);
+        IoDeleteDevice(device);
+        return ret;
+    default:
+        FIXME("Unhandled minor function %#x.\n", irpsp->MinorFunction);
+    }
+
+    IoSkipCurrentIrpStackLocation(irp);
+    return IoCallDriver(bus_pdo, irp);
+}
+
+static NTSTATUS pdo_pnp_dispatch(DEVICE_OBJECT *device, IRP *irp)
 {
     NTSTATUS status = irp->IoStatus.u.Status;
     IO_STACK_LOCATION *irpsp = IoGetCurrentIrpStackLocation(irp);
@@ -519,6 +548,13 @@ static NTSTATUS WINAPI common_pnp_dispatch(DEVICE_OBJECT *device, IRP *irp)
     return status;
 }
 
+static NTSTATUS WINAPI common_pnp_dispatch(DEVICE_OBJECT *device, IRP *irp)
+{
+    if (device == bus_fdo)
+        return fdo_pnp_dispatch(device, irp);
+    return pdo_pnp_dispatch(device, irp);
+}
+
 static NTSTATUS deliver_last_report(struct device_extension *ext, DWORD buffer_length, BYTE* buffer, ULONG_PTR *out_length)
 {
     if (buffer_length < ext->last_report_size)
@@ -592,6 +628,12 @@ static NTSTATUS WINAPI hid_internal_dispatch(DEVICE_OBJECT *device, IRP *irp)
 
     TRACE("(%p, %p)\n", device, irp);
 
+    if (device == bus_fdo)
+    {
+        IoSkipCurrentIrpStackLocation(irp);
+        return IoCallDriver(bus_pdo, irp);
+    }
+
     switch (irpsp->Parameters.DeviceIoControl.IoControlCode)
     {
         case IOCTL_HID_GET_DEVICE_ATTRIBUTES:
@@ -836,6 +878,26 @@ BOOL is_xbox_gamepad(WORD vid, WORD pid)
     return FALSE;
 }
 
+static NTSTATUS WINAPI driver_add_device(DRIVER_OBJECT *driver, DEVICE_OBJECT *pdo)
+{
+    NTSTATUS ret;
+
+    TRACE("driver %p, pdo %p.\n", driver, pdo);
+
+    if ((ret = IoCreateDevice(driver, 0, NULL, FILE_DEVICE_BUS_EXTENDER, 0, FALSE, &bus_fdo)))
+    {
+        ERR("Failed to create FDO, status %#x.\n", ret);
+        return ret;
+    }
+
+    IoAttachDeviceToDeviceStack(bus_fdo, pdo);
+    bus_pdo = pdo;
+
+    bus_fdo->Flags &= ~DO_DEVICE_INITIALIZING;
+
+    return STATUS_SUCCESS;
+}
+
 static void WINAPI driver_unload(DRIVER_OBJECT *driver)
 {
     udev_driver_unload();
@@ -933,6 +995,7 @@ NTSTATUS WINAPI DriverEntry( DRIVER_OBJECT *driver, UNICODE_STRING *path )
 
     driver->MajorFunction[IRP_MJ_PNP] = common_pnp_dispatch;
     driver->MajorFunction[IRP_MJ_INTERNAL_DEVICE_CONTROL] = hid_internal_dispatch;
+    driver->DriverExtension->AddDevice = driver_add_device;
     driver->DriverUnload = driver_unload;
 
     mouse_device_create();