misc.c

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/*
 * PROJECT:     ReactOS VT100 emulator
 * LICENSE:     GPL - See COPYING in the top level directory
 * FILE:        drivers/base/green/misc.c
 * PURPOSE:     Misceallenous operations
 * PROGRAMMERS: Copyright 2005-2006 Hervé Poussineau (hpoussin@reactos.org)
 */
 
#include "green.h"
 
#define NDEBUG
#include <debug.h>
 
NTSTATUS
GreenDeviceIoControl(
    IN PDEVICE_OBJECT DeviceObject,
    IN ULONG CtlCode,
    IN PVOID InputBuffer OPTIONAL,
    IN ULONG InputBufferSize,
    IN OUT PVOID OutputBuffer OPTIONAL,
    IN OUT PULONG OutputBufferSize)
{
    KEVENT Event;
    PIRP Irp;
    IO_STATUS_BLOCK IoStatus;
    NTSTATUS Status;
 
    KeInitializeEvent (&Event, NotificationEvent, FALSE);
 
    Irp = IoBuildDeviceIoControlRequest(CtlCode,
        DeviceObject,
        InputBuffer,
        InputBufferSize,
        OutputBuffer,
        (OutputBufferSize) ? *OutputBufferSize : 0,
        FALSE,
        &Event,
        &IoStatus);
    if (Irp == NULL)
    {
        DPRINT("IoBuildDeviceIoControlRequest() failed\n");
        return STATUS_INSUFFICIENT_RESOURCES;
    }
 
    Status = IoCallDriver(DeviceObject, Irp);
 
    if (Status == STATUS_PENDING)
    {
        DPRINT("Operation pending\n");
        KeWaitForSingleObject(&Event, Suspended, KernelMode, FALSE, NULL);
        Status = IoStatus.Status;
    }
 
    if (OutputBufferSize)
    {
        *OutputBufferSize = IoStatus.Information;
    }
 
    return Status;
}
 
NTSTATUS
ReadRegistryEntries(
    IN PUNICODE_STRING RegistryPath,
    IN PGREEN_DRIVER_EXTENSION DriverExtension)
{
    UNICODE_STRING ParametersRegistryKey;
    RTL_QUERY_REGISTRY_TABLE Parameters[4];
    NTSTATUS Status;
 
    ULONG DefaultDeviceReported = 0;
    ULONG DefaultSampleRate = 1200;
 
    ParametersRegistryKey.Length = 0;
    ParametersRegistryKey.MaximumLength = RegistryPath->Length + sizeof(L"\\Parameters") + sizeof(UNICODE_NULL);
    ParametersRegistryKey.Buffer = ExAllocatePool(PagedPool, ParametersRegistryKey.MaximumLength);
    if (!ParametersRegistryKey.Buffer)
    {
        DPRINT("ExAllocatePool() failed\n");
        return STATUS_INSUFFICIENT_RESOURCES;
    }
    RtlCopyUnicodeString(&ParametersRegistryKey, RegistryPath);
    RtlAppendUnicodeToString(&ParametersRegistryKey, L"\\Parameters");
    ParametersRegistryKey.Buffer[ParametersRegistryKey.Length / sizeof(WCHAR)] = UNICODE_NULL;
 
    RtlZeroMemory(Parameters, sizeof(Parameters));
 
    Parameters[0].Flags = RTL_QUERY_REGISTRY_DIRECT;
    Parameters[0].Name = L"AttachedDevice";
    Parameters[0].EntryContext = &DriverExtension->AttachedDeviceName;
 
    Parameters[1].Flags = RTL_QUERY_REGISTRY_DIRECT | RTL_REGISTRY_OPTIONAL;
    Parameters[1].Name = L"DeviceReported";
    Parameters[1].EntryContext = &DriverExtension->DeviceReported;
    Parameters[1].DefaultType = REG_DWORD;
    Parameters[1].DefaultData = &DefaultDeviceReported;
    Parameters[1].DefaultLength = sizeof(ULONG);
 
    Parameters[2].Flags = RTL_QUERY_REGISTRY_DIRECT | RTL_REGISTRY_OPTIONAL;
    Parameters[2].Name = L"SampleRate";
    Parameters[2].EntryContext = &DriverExtension->SampleRate;
    Parameters[2].DefaultType = REG_DWORD;
    Parameters[2].DefaultData = &DefaultSampleRate;
    Parameters[2].DefaultLength = sizeof(ULONG);
 
    Status = RtlQueryRegistryValues(
        RTL_REGISTRY_ABSOLUTE,
        ParametersRegistryKey.Buffer,
        Parameters,
        NULL,
        NULL);
 
    return Status;
}