rosapps/drivers/green/misc.c

   1 /*
   2  * PROJECT:     ReactOS VT100 emulator
   3  * LICENSE:     GPL - See COPYING in the top level directory
   4  * FILE:        drivers/base/green/misc.c
   5  * PURPOSE:     Misceallenous operations
   6  * PROGRAMMERS: Copyright 2005-2006 Hervé Poussineau (hpoussin@reactos.org)
   7  */
   8
   9 #include "green.h"
  10
  11 #define NDEBUG
  12 #include <debug.h>
  13
  14 NTSTATUS
  15 GreenDeviceIoControl(
  16         IN PDEVICE_OBJECT DeviceObject,
  17         IN ULONG CtlCode,
  18         IN PVOID InputBuffer OPTIONAL,
  19         IN ULONG InputBufferSize,
  20         IN OUT PVOID OutputBuffer OPTIONAL,
  21         IN OUT PULONG OutputBufferSize)
  22 {
  23         KEVENT Event;
  24         PIRP Irp;
  25         IO_STATUS_BLOCK IoStatus;
  26         NTSTATUS Status;
  27
  28         KeInitializeEvent (&Event, NotificationEvent, FALSE);
  29
  30         Irp = IoBuildDeviceIoControlRequest(CtlCode,
  31                 DeviceObject,
  32                 InputBuffer,
  33                 InputBufferSize,
  34                 OutputBuffer,
  35                 (OutputBufferSize) ? *OutputBufferSize : 0,
  36                 FALSE,
  37                 &Event,
  38                 &IoStatus);
  39         if (Irp == NULL)
  40         {
  41                 DPRINT("IoBuildDeviceIoControlRequest() failed\n");
  42                 return STATUS_INSUFFICIENT_RESOURCES;
  43         }
  44
  45         Status = IoCallDriver(DeviceObject, Irp);
  46
  47         if (Status == STATUS_PENDING)
  48         {
  49                 DPRINT("Operation pending\n");
  50                 KeWaitForSingleObject(&Event, Suspended, KernelMode, FALSE, NULL);
  51                 Status = IoStatus.Status;
  52         }
  53
  54         if (OutputBufferSize)
  55         {
  56                 *OutputBufferSize = IoStatus.Information;
  57         }
  58
  59         return Status;
  60 }
  61
  62 NTSTATUS
  63 ReadRegistryEntries(
  64         IN PUNICODE_STRING RegistryPath,
  65         IN PGREEN_DRIVER_EXTENSION DriverExtension)
  66 {
  67         UNICODE_STRING ParametersRegistryKey;
  68         RTL_QUERY_REGISTRY_TABLE Parameters[4];
  69         NTSTATUS Status;
  70
  71         ULONG DefaultDeviceReported = 0;
  72         ULONG DefaultSampleRate = 1200;
  73
  74         ParametersRegistryKey.Length = 0;
  75         ParametersRegistryKey.MaximumLength = RegistryPath->Length + sizeof(L"\\Parameters") + sizeof(UNICODE_NULL);
  76         ParametersRegistryKey.Buffer = ExAllocatePool(PagedPool, ParametersRegistryKey.MaximumLength);
  77         if (!ParametersRegistryKey.Buffer)
  78         {
  79                 DPRINT("ExAllocatePool() failed\n");
  80                 return STATUS_INSUFFICIENT_RESOURCES;
  81         }
  82         RtlCopyUnicodeString(&ParametersRegistryKey, RegistryPath);
  83         RtlAppendUnicodeToString(&ParametersRegistryKey, L"\\Parameters");
  84         ParametersRegistryKey.Buffer[ParametersRegistryKey.Length / sizeof(WCHAR)] = UNICODE_NULL;
  85
  86         RtlZeroMemory(Parameters, sizeof(Parameters));
  87
  88         Parameters[0].Flags = RTL_QUERY_REGISTRY_DIRECT;
  89         Parameters[0].Name = L"AttachedDevice";
  90         Parameters[0].EntryContext = &DriverExtension->AttachedDeviceName;
  91
  92         Parameters[1].Flags = RTL_QUERY_REGISTRY_DIRECT | RTL_REGISTRY_OPTIONAL;
  93         Parameters[1].Name = L"DeviceReported";
  94         Parameters[1].EntryContext = &DriverExtension->DeviceReported;
  95         Parameters[1].DefaultType = REG_DWORD;
  96         Parameters[1].DefaultData = &DefaultDeviceReported;
  97         Parameters[1].DefaultLength = sizeof(ULONG);
  98
  99         Parameters[2].Flags = RTL_QUERY_REGISTRY_DIRECT | RTL_REGISTRY_OPTIONAL;
 100         Parameters[2].Name = L"SampleRate";
 101         Parameters[2].EntryContext = &DriverExtension->SampleRate;
 102         Parameters[2].DefaultType = REG_DWORD;
 103         Parameters[2].DefaultData = &DefaultSampleRate;
 104         Parameters[2].DefaultLength = sizeof(ULONG);
 105
 106         Status = RtlQueryRegistryValues(
 107                 RTL_REGISTRY_ABSOLUTE,
 108                 ParametersRegistryKey.Buffer,
 109                 Parameters,
 110                 NULL,
 111                 NULL);
 112
 113         return Status;
 114 }