drivers/parallel/parport/misc.c

   1 /*
   2  * COPYRIGHT:       See COPYING in the top level directory
   3  * PROJECT:         Parallel Port Function Driver
   4  * FILE:            drivers/parallel/parport/misc.c
   5  * PURPOSE:         Miscellaneous functions
   6  */
   7
   8 #include "parport.h"
   9
  10
  11 static IO_COMPLETION_ROUTINE ForwardIrpAndWaitCompletion;
  12
  13 /* FUNCTIONS ****************************************************************/
  14
  15 static
  16 NTSTATUS
  17 NTAPI
  18 ForwardIrpAndWaitCompletion(IN PDEVICE_OBJECT DeviceObject,
  19                             IN PIRP Irp,
  20                             IN PVOID Context)
  21 {
  22     if (Irp->PendingReturned)
  23         KeSetEvent((PKEVENT)Context, IO_NO_INCREMENT, FALSE);
  24     return STATUS_MORE_PROCESSING_REQUIRED;
  25 }
  26
  27
  28 NTSTATUS
  29 ForwardIrpAndWait(IN PDEVICE_OBJECT DeviceObject,
  30                   IN PIRP Irp)
  31 {
  32     PDEVICE_OBJECT LowerDevice;
  33     KEVENT Event;
  34     NTSTATUS Status;
  35
  36     LowerDevice = ((PFDO_DEVICE_EXTENSION)DeviceObject->DeviceExtension)->LowerDevice;
  37     ASSERT(LowerDevice);
  38
  39     KeInitializeEvent(&Event, NotificationEvent, FALSE);
  40     IoCopyCurrentIrpStackLocationToNext(Irp);
  41
  42     DPRINT("Calling lower device %p\n", LowerDevice);
  43     IoSetCompletionRoutine(Irp, ForwardIrpAndWaitCompletion, &Event, TRUE, TRUE, TRUE);
  44
  45     Status = IoCallDriver(LowerDevice, Irp);
  46     if (Status == STATUS_PENDING)
  47     {
  48         Status = KeWaitForSingleObject(&Event, Suspended, KernelMode, FALSE, NULL);
  49         if (NT_SUCCESS(Status))
  50             Status = Irp->IoStatus.Status;
  51     }
  52
  53     return Status;
  54 }
  55
  56
  57 NTSTATUS
  58 NTAPI
  59 ForwardIrpAndForget(IN PDEVICE_OBJECT DeviceObject,
  60                     IN PIRP Irp)
  61 {
  62     PDEVICE_OBJECT LowerDevice;
  63
  64     if (((PFDO_DEVICE_EXTENSION)DeviceObject->DeviceExtension)->Common.IsFDO)
  65         LowerDevice = ((PFDO_DEVICE_EXTENSION)DeviceObject->DeviceExtension)->LowerDevice;
  66     else
  67         LowerDevice = ((PPDO_DEVICE_EXTENSION)DeviceObject->DeviceExtension)->AttachedFdo;
  68     ASSERT(LowerDevice);
  69
  70     IoSkipCurrentIrpStackLocation(Irp);
  71     return IoCallDriver(LowerDevice, Irp);
  72 }
  73
  74
  75 PVOID
  76 GetUserBuffer(IN PIRP Irp)
  77 {
  78     ASSERT(Irp);
  79
  80     if (Irp->MdlAddress)
  81         return Irp->MdlAddress;
  82     else
  83         return Irp->AssociatedIrp.SystemBuffer;
  84 }
  85
  86 /* EOF */