[PATCH v5 0/1] MR10301: hidclass.sys: Report correct device type for HID device objects.

[Jan Robert Gerigk (＠RgSg86)]

HID child PDOs were created with DeviceType 0 and no characteristics,
causing GetFileType() to return FILE_TYPE_DISK instead of
FILE_TYPE_UNKNOWN. This broke .NET applications (e.g. ETS6) that use
FileStream on HID device handles, as FileStream incorrectly treats
FILE_TYPE_DISK handles as seekable files.

Set DeviceType to FILE_DEVICE_UNKNOWN and Characteristics to
FILE_AUTOGENERATED_DEVICE_NAME to match Windows behavior, and add an
IRP_MJ_QUERY_VOLUME_INFORMATION handler to return these values.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=59512

--
  v5: hidclass.sys: Report correct device type for HID device objects.
 
https://gitlab.winehq.org/wine/wine/-/merge_requests/10301

[PATCH v5 1/1] hidclass.sys: Report correct device type for HID device objects.

[Robert Gerigk]

From: Robert Gerigk <[e-mail]>

---
 dlls/hid/tests/device.c | 22 ++++++++++++++++++++
 dlls/hidclass.sys/pnp.c | 45 +++++++++++++++++++++++++++++++----------
 2 files changed, 56 insertions(+), 11 deletions(-)

diff --git a/dlls/hid/tests/device.c b/dlls/hid/tests/device.c
index 8b5ff7a0fe7..61e9a2f38a3 100644
--- a/dlls/hid/tests/device.c
+++ b/dlls/hid/tests/device.c
@@ -24,6 +24,9 @@
 #include "hidusage.h"
 #include "ddk/hidsdi.h"
 
+#include "winternl.h"
+#include "winioctl.h"
+
 #include "wine/test.h"
 
 #define READ_MAX_TIME 5000
@@ -458,9 +461,28 @@ static void test_get_input_report(void)
     HeapFree(GetProcessHeap(), 0, report);
 }
 
+static void test_device_file_type(HANDLE device)
+{
+    FILE_FS_DEVICE_INFORMATION info;
+    IO_STATUS_BLOCK io;
+    NTSTATUS status;
+    DWORD file_type;
+
+    file_type = GetFileType(device);
+    todo_wine
+    ok(file_type == FILE_TYPE_UNKNOWN, "Expected FILE_TYPE_UNKNOWN, got %lu\n", file_type);
+
+    memset(&info, 0xcc, sizeof(info));
+    memset(&io, 0xcc, sizeof(io));
+    status = NtQueryVolumeInformationFile(device, &io, &info, sizeof(info), FileFsDeviceInformation);
+    ok(status == STATUS_SUCCESS, "NtQueryVolumeInformationFile failed: %lx\n", status);
+    ok(info.DeviceType == FILE_DEVICE_UNKNOWN, "Expected FILE_DEVICE_UNKNOWN (0x22), got %#lx\n", info.DeviceType);
+}
+
 START_TEST(device)
 {
     run_for_each_device(test_device_info);
+    run_for_each_device(test_device_file_type);
     test_read_device();
     test_get_input_report();
 }
diff --git a/dlls/hidclass.sys/pnp.c b/dlls/hidclass.sys/pnp.c
index 4774ba2b9fc..87531104354 100644
--- a/dlls/hidclass.sys/pnp.c
+++ b/dlls/hidclass.sys/pnp.c
@@ -260,23 +260,14 @@ static NTSTATUS create_child_pdos( minidriver *minidriver, DEVICE_OBJECT *device
     struct func_device *fdo = fdo_from_DEVICE_OBJECT( device );
     DEVICE_OBJECT *child_device;
     struct phys_device *pdo;
-    UNICODE_STRING string;
-    WCHAR pdo_name[255];
     USAGE page, usage;
     NTSTATUS status;
     INT i;
 
     for (i = 0; i < fdo->device_desc.CollectionDescLength; ++i)
     {
-        if (fdo->device_desc.CollectionDescLength > 1)
-            swprintf( pdo_name, ARRAY_SIZE(pdo_name), L"\\Device\\HID#%p&%p&%d", device->DriverObject,
-                      fdo->base.hid.PhysicalDeviceObject, i );
-        else
-            swprintf( pdo_name, ARRAY_SIZE(pdo_name), L"\\Device\\HID#%p&%p", device->DriverObject,
-                      fdo->base.hid.PhysicalDeviceObject );
-
-        RtlInitUnicodeString(&string, pdo_name);
-        if ((status = IoCreateDevice( device->DriverObject, sizeof(*pdo), &string, 0, 0, FALSE, &child_device )))
+        if ((status = IoCreateDevice( device->DriverObject, sizeof(*pdo), NULL,
+                                      FILE_DEVICE_UNKNOWN, FILE_AUTOGENERATED_DEVICE_NAME, FALSE, &child_device )))
         {
             ERR( "Failed to create child PDO, status %#lx.\n", status );
             return status;
@@ -666,6 +657,37 @@ static NTSTATUS WINAPI driver_close(DEVICE_OBJECT *device, IRP *irp)
     return pdo_close(device, irp);
 }
 
+static NTSTATUS WINAPI driver_query_volume(DEVICE_OBJECT *device, IRP *irp)
+{
+    IO_STACK_LOCATION *irpsp = IoGetCurrentIrpStackLocation( irp );
+    NTSTATUS status;
+
+    if (irpsp->Parameters.QueryVolume.FsInformationClass == FileFsDeviceInformation)
+    {
+        if (irpsp->Parameters.QueryVolume.Length < sizeof(FILE_FS_DEVICE_INFORMATION))
+        {
+            status = STATUS_BUFFER_TOO_SMALL;
+        }
+        else
+        {
+            FILE_FS_DEVICE_INFORMATION *info = irp->AssociatedIrp.SystemBuffer;
+            info->DeviceType = device->DeviceType;
+            info->Characteristics = device->Characteristics;
+            irp->IoStatus.Information = sizeof(*info);
+            status = STATUS_SUCCESS;
+        }
+    }
+    else
+    {
+        FIXME("unhandled volume info class %x\n", irpsp->Parameters.QueryVolume.FsInformationClass);
+        status = STATUS_NOT_IMPLEMENTED;
+    }
+
+    irp->IoStatus.Status = status;
+    IoCompleteRequest( irp, IO_NO_INCREMENT );
+    return status;
+}
+
 static NTSTATUS WINAPI driver_ioctl(DEVICE_OBJECT *device, IRP *irp)
 {
     return pdo_ioctl(device, irp);
@@ -715,6 +737,7 @@ NTSTATUS WINAPI HidRegisterMinidriver(HID_MINIDRIVER_REGISTRATION *registration)
     registration->DriverObject->MajorFunction[IRP_MJ_WRITE] = driver_write;
     registration->DriverObject->MajorFunction[IRP_MJ_CREATE] = driver_create;
     registration->DriverObject->MajorFunction[IRP_MJ_CLOSE] = driver_close;
+    registration->DriverObject->MajorFunction[IRP_MJ_QUERY_VOLUME_INFORMATION] = driver_query_volume;
 
     driver->PNPDispatch = registration->DriverObject->MajorFunction[IRP_MJ_PNP];
     registration->DriverObject->MajorFunction[IRP_MJ_PNP] = driver_pnp;
-- 
GitLab

https://gitlab.winehq.org/wine/wine/-/merge_requests/10301

[Rémi Bernon]

On Thu Mar 19 11:26:38 2026 +0000, Jan Robert Gerigk wrote:
> I checked again on Windows, HID PDO names are autogenerated
> (\\Device\\00000089, \\Device\\00000081, etc.), not string-based. So
> FILE_AUTOGENERATED_DEVICE_NAME is the correct approach.
> I will update the patch to use FILE_AUTOGENERATED_DEVICE_NAME and remove
> the string parameter.
> Could you restore the test as well? Thanks.

-- 
https://gitlab.winehq.org/wine/wine/-/merge_requests/10301#note_132773