drivers/usb/usbehci/misc.c

   1 /*
   2  * PROJECT:     ReactOS Universal Serial Bus Bulk Enhanced Host Controller Interface
   3  * LICENSE:     GPL - See COPYING in the top level directory
   4  * FILE:        drivers/usb/usbehci/misc.c
   5  * PURPOSE:     Misceallenous operations.
   6  * PROGRAMMERS:
   7  *              Michael Martin
   8  */
   9
  10 #include "usbehci.h"
  11
  12 /*
  13    Get SymblicName from Parameters in Registry Key
  14    Caller is responsible for freeing pool of returned pointer
  15 */
  16 PWSTR
  17 GetSymbolicName(PDEVICE_OBJECT DeviceObject)
  18 {
  19     NTSTATUS Status;
  20     HANDLE DevInstRegKey;
  21     UNICODE_STRING SymbolicName;
  22     PKEY_VALUE_PARTIAL_INFORMATION KeyPartInfo;
  23     ULONG SizeNeeded;
  24     PWCHAR SymbolicNameString = NULL;
  25
  26     Status = IoOpenDeviceRegistryKey(DeviceObject,
  27                                      PLUGPLAY_REGKEY_DEVICE,
  28                                      STANDARD_RIGHTS_ALL,
  29                                      &DevInstRegKey);
  30
  31     DPRINT("IoOpenDeviceRegistryKey PLUGPLAY_REGKEY_DEVICE Status %x\n", Status);
  32
  33     if (NT_SUCCESS(Status))
  34     {
  35         RtlInitUnicodeString(&SymbolicName, L"SymbolicName");
  36         Status = ZwQueryValueKey(DevInstRegKey,
  37                                  &SymbolicName,
  38                                  KeyValuePartialInformation,
  39                                  NULL,
  40                                  0,
  41                                  &SizeNeeded);
  42
  43         DPRINT("ZwQueryValueKey status %x, %d\n", Status, SizeNeeded);
  44
  45         if (Status == STATUS_BUFFER_TOO_SMALL)
  46         {
  47             KeyPartInfo = (PKEY_VALUE_PARTIAL_INFORMATION ) ExAllocatePool(PagedPool, SizeNeeded);
  48             if (!KeyPartInfo)
  49             {
  50                 DPRINT1("OUT OF MEMORY\n");
  51                 return NULL;
  52             }
  53             else
  54             {
  55                  Status = ZwQueryValueKey(DevInstRegKey,
  56                                           &SymbolicName,
  57                                           KeyValuePartialInformation,
  58                                           KeyPartInfo,
  59                                           SizeNeeded,
  60                                           &SizeNeeded);
  61
  62                  SymbolicNameString = ExAllocatePool(PagedPool, (KeyPartInfo->DataLength + sizeof(WCHAR)));
  63                  if (!SymbolicNameString)
  64                  {
  65                      return NULL;
  66                  }
  67                  RtlZeroMemory(SymbolicNameString, KeyPartInfo->DataLength + 2);
  68                  RtlCopyMemory(SymbolicNameString, KeyPartInfo->Data, KeyPartInfo->DataLength);
  69             }
  70
  71             ExFreePool(KeyPartInfo);
  72         }
  73
  74         ZwClose(DevInstRegKey);
  75     }
  76
  77     return SymbolicNameString;
  78 }
  79
  80 /*
  81    Get Physical Device Object Name from registry
  82    Caller is responsible for freeing pool
  83 */
  84 PWSTR
  85 GetPhysicalDeviceObjectName(PDEVICE_OBJECT DeviceObject)
  86 {
  87     NTSTATUS Status;
  88     PWSTR ObjectName = NULL;
  89     ULONG SizeNeeded;
  90
  91     Status = IoGetDeviceProperty(DeviceObject,
  92                                  DevicePropertyPhysicalDeviceObjectName,
  93                                  0,
  94                                  NULL,
  95                                  &SizeNeeded);
  96
  97     if (Status != STATUS_BUFFER_TOO_SMALL)
  98     {
  99         DPRINT1("Expected STATUS_BUFFER_TOO_SMALL, got %x!\n", Status);
 100         return NULL;
 101     }
 102
 103     ObjectName = (PWSTR) ExAllocatePool(PagedPool, SizeNeeded + sizeof(WCHAR));
 104     if (!ObjectName)
 105     {
 106         DPRINT1("Out of memory\n");
 107         return NULL;
 108     }
 109
 110     Status = IoGetDeviceProperty(DeviceObject,
 111                                  DevicePropertyPhysicalDeviceObjectName,
 112                                  SizeNeeded,
 113                                  ObjectName,
 114                                  &SizeNeeded);
 115     if (!NT_SUCCESS(Status))
 116     {
 117         DPRINT1("Failed to Get Property\n");
 118         return NULL;
 119     }
 120
 121     return ObjectName;
 122 }
 123