Initial publish

author: Dave Wilson <[email protected]> 2015-03-17 19:50:07 -0700
committer: Dave Wilson <[email protected]> 2015-03-17 19:50:07 -0700
commit: 97cf5197cf5b882b2c689d8dc2b555f2edf8f418 (patch)
tree: 46f3701832d70b420eb0fc0eb93261f9da45db3f /serial/VirtualSerial
parent: ef1905bf1e8825bb31120dfb27e0daf3154d859a (diff)
25 files changed, 5153 insertions, 0 deletions
diff --git a/serial/VirtualSerial/ComPort/exports.def b/serial/VirtualSerial/ComPort/exports.def
new file mode 100644
index 00000000..5d92ff03
--- /dev/null
+++ b/serial/VirtualSerial/ComPort/exports.def
@@ -0,0 +1,6 @@
+; exports.def : Declares the module parameters.
+
+LIBRARY      "Virtualserial.DLL"
+
+EXPORTS
+    DllGetClassObject   PRIVATE
diff --git a/serial/VirtualSerial/ComPort/virtualserial.inx b/serial/VirtualSerial/ComPort/virtualserial.inx
new file mode 100644
index 00000000..4242388c
--- /dev/null
+++ b/serial/VirtualSerial/ComPort/virtualserial.inx
@@ -0,0 +1,78 @@
+;
+; VirtualSerial.inf
+;
+
+[Version]
+Signature="$Windows NT$"
+Class=Ports
+ClassGuid={4D36E978-E325-11CE-BFC1-08002BE10318}
+Provider=%MSFTUMDF%
+CatalogFile=WUDF.cat
+DriverVer=03/25/2005,0.0.0.1
+
+[Manufacturer]
+%MSFTUMDF%=Microsoft,NT$ARCH$
+
+[Microsoft.NT$ARCH$]
+%VirtualSerialDeviceName%=VirtualSerial_Install,UMDF\VirtualSerial
+
+[SourceDisksFiles]
+Virtualserial.dll=1
+WudfUpdate_$UMDFCOINSTALLERVERSION$.dll=1
+
+[SourceDisksNames]
+1 = %MediaDescription%
+
+; =================== UMDF VirtualSerial Device ==================================
+
+[VirtualSerial_Install.NT]
+CopyFiles=UMDriverCopy
+
+[VirtualSerial_Install.NT.hw]
+
+[VirtualSerial_Install.NT.Services]
+AddService=WUDFRd,0x000001fa,WUDFRD_ServiceInstall
+
+[VirtualSerial_Install.NT.CoInstallers]
+CopyFiles=CoInstallers_CopyFiles
+AddReg=CoInstallers_AddReg
+
+[VirtualSerial_Install.NT.Wdf]
+UmdfService=VirtualSerial,VirtualSerial_Install
+UmdfServiceOrder=VirtualSerial
+UmdfKernelModeClientPolicy = AllowKernelModeClients
+UmdfFileObjectPolicy = AllowNullAndUnknownFileObjects
+UmdfFsContextUsePolicy = CannotUseFsContexts
+
+[VirtualSerial_Install]
+UmdfLibraryVersion=$UMDFVERSION$
+ServiceBinary=%12%\UMDF\Virtualserial.dll
+DriverCLSID={C8ECC087-6B79-4de5-8FB4-C03358A29617}
+
+[WUDFRD_ServiceInstall]
+DisplayName = %WudfRdDisplayName%
+ServiceType = 1
+StartType = 3
+ErrorControl = 1
+ServiceBinary = %12%\WUDFRd.sys
+
+[CoInstallers_CopyFiles]
+WudfUpdate_$UMDFCOINSTALLERVERSION$.dll
+
+[CoInstallers_AddReg]
+HKR,,CoInstallers32,0x00010000,"WUDFUpdate_$UMDFCOINSTALLERVERSION$.dll"
+
+[DestinationDirs]
+UMDriverCopy=12,UMDF ; copy to drivers\UMDF
+CoInstallers_CopyFiles=11
+
+[UMDriverCopy]
+Virtualserial.dll
+
+; =================== Generic ==================================
+
+[Strings]
+MSFTUMDF="Microsoft"
+MediaDescription="Microsoft Sample Driver Installation Media"
+WudfRdDisplayName="Windows Driver Foundation - User-mode Driver Framework Reflector"
+VirtualSerialDeviceName="Microsoft VirtualSerial User-Mode Device Sample"
diff --git a/serial/VirtualSerial/ComPort/virtualserial.rc b/serial/VirtualSerial/ComPort/virtualserial.rc
new file mode 100644
index 00000000..eeda38a7
--- /dev/null
+++ b/serial/VirtualSerial/ComPort/virtualserial.rc
@@ -0,0 +1,17 @@
+//---------------------------------------------------------------------------
+// Virtualserial.rc
+//
+// Copyright (c) Microsoft Corporation, All Rights Reserved
+//---------------------------------------------------------------------------
+
+
+#include <windows.h>
+#include <ntverp.h>
+
+#define VER_FILETYPE                VFT_DLL
+#define VER_FILESUBTYPE             VFT_UNKNOWN
+#define VER_FILEDESCRIPTION_STR     "WDF:UMDF VirtualSerial User-Mode Driver Sample"
+#define VER_INTERNALNAME_STR        "VirtualSerial"
+#define VER_ORIGINALFILENAME_STR    "Virtualserial.dll"
+
+#include "common.ver"
diff --git a/serial/VirtualSerial/ComPort/virtualserial.vcxproj b/serial/VirtualSerial/ComPort/virtualserial.vcxproj
new file mode 100644
index 00000000..66943fc2
--- /dev/null
+++ b/serial/VirtualSerial/ComPort/virtualserial.vcxproj
@@ -0,0 +1,256 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project DefaultTargets="Build" ToolsVersion="12.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup Label="ProjectConfigurations">
+    <ProjectConfiguration Include="Debug|Win32">
+      <Configuration>Debug</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|Win32">
+      <Configuration>Release</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Debug|x64">
+      <Configuration>Debug</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|x64">
+      <Configuration>Release</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+  </ItemGroup>
+  <PropertyGroup Label="Globals">
+    <ProjectGuid>{EFB282A8-A881-44E7-964D-F068A4FD19C9}</ProjectGuid>
+    <RootNamespace>$(MSBuildProjectName)</RootNamespace>
+    <UMDF_VERSION_MAJOR>1</UMDF_VERSION_MAJOR>
+    <Configuration Condition="'$(Configuration)' == ''">Debug</Configuration>
+    <Platform Condition="'$(Platform)' == ''">Win32</Platform>
+    <SampleGuid>{BA45F248-4EC7-4AF6-A0B1-438FABDF4722}</SampleGuid>
+  </PropertyGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
+  <PropertyGroup Label="Configuration" Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <TargetVersion>Windows10</TargetVersion>
+    <UseDebugLibraries>False</UseDebugLibraries>
+    <DriverTargetPlatform>Desktop</DriverTargetPlatform>
+    <DriverType>UMDF</DriverType>
+    <PlatformToolset>WindowsUserModeDriver10.0</PlatformToolset>
+    <ConfigurationType>DynamicLibrary</ConfigurationType>
+  </PropertyGroup>
+  <PropertyGroup Label="Configuration" Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <TargetVersion>Windows10</TargetVersion>
+    <UseDebugLibraries>True</UseDebugLibraries>
+    <DriverTargetPlatform>Desktop</DriverTargetPlatform>
+    <DriverType>UMDF</DriverType>
+    <PlatformToolset>WindowsUserModeDriver10.0</PlatformToolset>
+    <ConfigurationType>DynamicLibrary</ConfigurationType>
+  </PropertyGroup>
+  <PropertyGroup Label="Configuration" Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
+    <TargetVersion>Windows10</TargetVersion>
+    <UseDebugLibraries>False</UseDebugLibraries>
+    <DriverTargetPlatform>Desktop</DriverTargetPlatform>
+    <DriverType>UMDF</DriverType>
+    <PlatformToolset>WindowsUserModeDriver10.0</PlatformToolset>
+    <ConfigurationType>DynamicLibrary</ConfigurationType>
+  </PropertyGroup>
+  <PropertyGroup Label="Configuration" Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
+    <TargetVersion>Windows10</TargetVersion>
+    <UseDebugLibraries>True</UseDebugLibraries>
+    <DriverTargetPlatform>Desktop</DriverTargetPlatform>
+    <DriverType>UMDF</DriverType>
+    <PlatformToolset>WindowsUserModeDriver10.0</PlatformToolset>
+    <ConfigurationType>DynamicLibrary</ConfigurationType>
+  </PropertyGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
+  <PropertyGroup>
+    <OutDir>$(IntDir)</OutDir>
+  </PropertyGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" />
+  </ImportGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" />
+  </ImportGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" />
+  </ImportGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" />
+  </ImportGroup>
+  <ItemGroup Label="WrappedTaskItems">
+    <ClCompile Include="..\dllsup.cpp; ..\comsup.cpp; ..\driver.cpp; ..\device.cpp; ..\queue.cpp; ..\ringbuffer.cpp">
+      <WppEnabled>true</WppEnabled>
+      <WppDllMacro>true</WppDllMacro>
+      <WppScanConfigurationData>..\internal.h</WppScanConfigurationData>
+    </ClCompile>
+    <Inf Include="virtualserial.inx">
+      <Architecture>$(InfArch)</Architecture>
+      <SpecifyArchitecture>true</SpecifyArchitecture>
+      <CopyOutput>.\$(IntDir)\virtualserial.inf</CopyOutput>
+    </Inf>
+    <OtherWpp Include="virtualserial.rc">
+      <WppEnabled>true</WppEnabled>
+      <WppDllMacro>true</WppDllMacro>
+      <WppScanConfigurationData>..\internal.h</WppScanConfigurationData>
+    </OtherWpp>
+  </ItemGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <TargetName>virtualserial</TargetName>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <TargetName>virtualserial</TargetName>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
+    <TargetName>virtualserial</TargetName>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
+    <TargetName>virtualserial</TargetName>
+  </PropertyGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <ClCompile>
+      <PreprocessorDefinitions>%(PreprocessorDefinitions);_UNICODE;UNICODE</PreprocessorDefinitions>
+    </ClCompile>
+    <Midl>
+      <PreprocessorDefinitions>%(PreprocessorDefinitions);_UNICODE;UNICODE</PreprocessorDefinitions>
+    </Midl>
+    <ResourceCompile>
+      <PreprocessorDefinitions>%(PreprocessorDefinitions);_UNICODE;UNICODE</PreprocessorDefinitions>
+    </ResourceCompile>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <ClCompile>
+      <PreprocessorDefinitions>%(PreprocessorDefinitions);_UNICODE;UNICODE</PreprocessorDefinitions>
+    </ClCompile>
+    <Midl>
+      <PreprocessorDefinitions>%(PreprocessorDefinitions);_UNICODE;UNICODE</PreprocessorDefinitions>
+    </Midl>
+    <ResourceCompile>
+      <PreprocessorDefinitions>%(PreprocessorDefinitions);_UNICODE;UNICODE</PreprocessorDefinitions>
+    </ResourceCompile>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
+    <ClCompile>
+      <PreprocessorDefinitions>%(PreprocessorDefinitions);_UNICODE;UNICODE</PreprocessorDefinitions>
+    </ClCompile>
+    <Midl>
+      <PreprocessorDefinitions>%(PreprocessorDefinitions);_UNICODE;UNICODE</PreprocessorDefinitions>
+    </Midl>
+    <ResourceCompile>
+      <PreprocessorDefinitions>%(PreprocessorDefinitions);_UNICODE;UNICODE</PreprocessorDefinitions>
+    </ResourceCompile>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
+    <ClCompile>
+      <PreprocessorDefinitions>%(PreprocessorDefinitions);_UNICODE;UNICODE</PreprocessorDefinitions>
+    </ClCompile>
+    <Midl>
+      <PreprocessorDefinitions>%(PreprocessorDefinitions);_UNICODE;UNICODE</PreprocessorDefinitions>
+    </Midl>
+    <ResourceCompile>
+      <PreprocessorDefinitions>%(PreprocessorDefinitions);_UNICODE;UNICODE</PreprocessorDefinitions>
+    </ResourceCompile>
+  </ItemDefinitionGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <WIN32_WINNT_VERSION>0x0A00</WIN32_WINNT_VERSION>
+    <NTDDI_VERSION>0x0A000000</NTDDI_VERSION>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <WIN32_WINNT_VERSION>0x0A00</WIN32_WINNT_VERSION>
+    <NTDDI_VERSION>0x0A000000</NTDDI_VERSION>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
+    <WIN32_WINNT_VERSION>0x0A00</WIN32_WINNT_VERSION>
+    <NTDDI_VERSION>0x0A000000</NTDDI_VERSION>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
+    <WIN32_WINNT_VERSION>0x0A00</WIN32_WINNT_VERSION>
+    <NTDDI_VERSION>0x0A000000</NTDDI_VERSION>
+  </PropertyGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <Link>
+      <EntryPointSymbol Condition="'$(Platform)'=='win32'">_DllMainCRTStartup@12</EntryPointSymbol>
+      <EntryPointSymbol Condition="'$(Platform)'!='win32'">_DllMainCRTStartup</EntryPointSymbol>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <Link>
+      <EntryPointSymbol Condition="'$(Platform)'=='win32'">_DllMainCRTStartup@12</EntryPointSymbol>
+      <EntryPointSymbol Condition="'$(Platform)'!='win32'">_DllMainCRTStartup</EntryPointSymbol>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
+    <Link>
+      <EntryPointSymbol Condition="'$(Platform)'=='win32'">_DllMainCRTStartup@12</EntryPointSymbol>
+      <EntryPointSymbol Condition="'$(Platform)'!='win32'">_DllMainCRTStartup</EntryPointSymbol>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
+    <Link>
+      <EntryPointSymbol Condition="'$(Platform)'=='win32'">_DllMainCRTStartup@12</EntryPointSymbol>
+      <EntryPointSymbol Condition="'$(Platform)'!='win32'">_DllMainCRTStartup</EntryPointSymbol>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <ClCompile>
+      <TreatWarningAsError>true</TreatWarningAsError>
+      <WarningLevel>Level4</WarningLevel>
+      <ExceptionHandling>
+      </ExceptionHandling>
+    </ClCompile>
+    <Link>
+      <AdditionalDependencies>%(AdditionalDependencies);$(SDK_LIB_PATH)\strsafe.lib;$(SDK_LIB_PATH)\ntdll.lib;$(SDK_LIB_PATH)\kernel32.lib;$(SDK_LIB_PATH)\advapi32.lib;$(SDK_LIB_PATH)\Ole32.lib;$(SDK_LIB_PATH)\setupapi.lib</AdditionalDependencies>
+      <ModuleDefinitionFile>exports.def</ModuleDefinitionFile>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <ClCompile>
+      <TreatWarningAsError>true</TreatWarningAsError>
+      <WarningLevel>Level4</WarningLevel>
+      <ExceptionHandling>
+      </ExceptionHandling>
+    </ClCompile>
+    <Link>
+      <AdditionalDependencies>%(AdditionalDependencies);$(SDK_LIB_PATH)\strsafe.lib;$(SDK_LIB_PATH)\ntdll.lib;$(SDK_LIB_PATH)\kernel32.lib;$(SDK_LIB_PATH)\advapi32.lib;$(SDK_LIB_PATH)\Ole32.lib;$(SDK_LIB_PATH)\setupapi.lib</AdditionalDependencies>
+      <ModuleDefinitionFile>exports.def</ModuleDefinitionFile>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
+    <ClCompile>
+      <TreatWarningAsError>true</TreatWarningAsError>
+      <WarningLevel>Level4</WarningLevel>
+      <ExceptionHandling>
+      </ExceptionHandling>
+    </ClCompile>
+    <Link>
+      <AdditionalDependencies>%(AdditionalDependencies);$(SDK_LIB_PATH)\strsafe.lib;$(SDK_LIB_PATH)\ntdll.lib;$(SDK_LIB_PATH)\kernel32.lib;$(SDK_LIB_PATH)\advapi32.lib;$(SDK_LIB_PATH)\Ole32.lib;$(SDK_LIB_PATH)\setupapi.lib</AdditionalDependencies>
+      <ModuleDefinitionFile>exports.def</ModuleDefinitionFile>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
+    <ClCompile>
+      <TreatWarningAsError>true</TreatWarningAsError>
+      <WarningLevel>Level4</WarningLevel>
+      <ExceptionHandling>
+      </ExceptionHandling>
+    </ClCompile>
+    <Link>
+      <AdditionalDependencies>%(AdditionalDependencies);$(SDK_LIB_PATH)\strsafe.lib;$(SDK_LIB_PATH)\ntdll.lib;$(SDK_LIB_PATH)\kernel32.lib;$(SDK_LIB_PATH)\advapi32.lib;$(SDK_LIB_PATH)\Ole32.lib;$(SDK_LIB_PATH)\setupapi.lib</AdditionalDependencies>
+      <ModuleDefinitionFile>exports.def</ModuleDefinitionFile>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemGroup>
+    <ResourceCompile Include="virtualserial.rc" />
+  </ItemGroup>
+  <ItemGroup>
+    <Inf Exclude="@(Inf)" Include="*.inf" />
+    <FilesToPackage Include="$(TargetPath)" Condition="'$(ConfigurationType)'=='Driver' or '$(ConfigurationType)'=='DynamicLibrary'" />
+    <FilesToPackage Include="@(Inf->'%(CopyOutput)')" Condition="'@(Inf)'!=''" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Exclude="@(None)" Include="*.txt;*.htm;*.html" />
+    <None Exclude="@(None)" Include="*.ico;*.cur;*.bmp;*.dlg;*.rct;*.gif;*.jpg;*.jpeg;*.wav;*.jpe;*.tiff;*.tif;*.png;*.rc2" />
+    <None Exclude="@(None)" Include="*.def;*.bat;*.hpj;*.asmx" />
+  </ItemGroup>
+  <ItemGroup>
+    <ClInclude Exclude="@(ClInclude)" Include="*.h;*.hpp;*.hxx;*.hm;*.inl;*.xsd" />
+  </ItemGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
+</Project>
+\ No newline at end of file
diff --git a/serial/VirtualSerial/ComPort/virtualserial.vcxproj.Filters b/serial/VirtualSerial/ComPort/virtualserial.vcxproj.Filters
new file mode 100644
index 00000000..43e9f856
--- /dev/null
+++ b/serial/VirtualSerial/ComPort/virtualserial.vcxproj.Filters
@@ -0,0 +1,57 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup>
+    <Filter Include="Source Files">
+      <Extensions>cpp;c;cc;cxx;def;odl;idl;hpj;bat;asm;asmx;*</Extensions>
+      <UniqueIdentifier>{2B1C4ECC-41B3-4BE4-B6AB-A37A6988B553}</UniqueIdentifier>
+    </Filter>
+    <Filter Include="Header Files">
+      <Extensions>h;hpp;hxx;hm;inl;inc;xsd</Extensions>
+      <UniqueIdentifier>{FD1A6174-0DDB-456B-B047-A0BE30AC7612}</UniqueIdentifier>
+    </Filter>
+    <Filter Include="Resource Files">
+      <Extensions>rc;ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe;resx;tiff;tif;png;wav;mfcribbon-ms;man;xml</Extensions>
+      <UniqueIdentifier>{75CE36CB-D686-4BF7-8BD9-F7275C1AC174}</UniqueIdentifier>
+    </Filter>
+    <Filter Include="Driver Files">
+      <Extensions>inf;inv;inx;mof;mc;</Extensions>
+      <UniqueIdentifier>{05B7B9F6-1D0D-4F2D-BAA2-C6E6B1E74EE1}</UniqueIdentifier>
+    </Filter>
+  </ItemGroup>
+  <ItemGroup>
+    <ClCompile Include="..\comsup.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\device.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\dllsup.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\driver.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\queue.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\ringbuffer.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <None Include="exports.def">
+      <Filter>Source Files</Filter>
+    </None>
+  </ItemGroup>
+  <ItemGroup>
+    <FilesToPackage Include=".\Debug\\virtualserial.inf">
+      <Filter>Driver Files</Filter>
+    </FilesToPackage>
+    <Inf Include="virtualserial.inx">
+      <Filter>Driver Files</Filter>
+    </Inf>
+  </ItemGroup>
+  <ItemGroup>
+    <ResourceCompile Include="virtualserial.rc">
+      <Filter>Resource Files</Filter>
+    </ResourceCompile>
+  </ItemGroup>
+</Project>
+\ No newline at end of file
diff --git a/serial/VirtualSerial/FakeModem/exports.def b/serial/VirtualSerial/FakeModem/exports.def
new file mode 100644
index 00000000..48845d0c
--- /dev/null
+++ b/serial/VirtualSerial/FakeModem/exports.def
@@ -0,0 +1,6 @@
+; exports.def : Declares the module parameters.
+
+LIBRARY      "FakeModem.DLL"
+
+EXPORTS
+    DllGetClassObject   PRIVATE
diff --git a/serial/VirtualSerial/FakeModem/fakemodem.inx b/serial/VirtualSerial/FakeModem/fakemodem.inx
new file mode 100644
index 00000000..be83ca64
--- /dev/null
+++ b/serial/VirtualSerial/FakeModem/fakemodem.inx
@@ -0,0 +1,202 @@
+;
+; FakeModem.inf
+; "Fakemodem" Controllerless driver illustrative example
+;
+
+[Version]
+Signature="$Windows NT$"
+Class=Modem
+ClassGuid={4D36E96D-E325-11CE-BFC1-08002BE10318}
+Provider=%MSFTUMDF%
+CatalogFile=WUDF.cat
+DriverVer=12/30/2010,0.0.0.1
+
+[Manufacturer]
+%MSFTUMDF%=Microsoft,NT$ARCH$
+
+[Microsoft.NT$ARCH$]
+%FakeModemDeviceName%=FakeModem_Install,{b85b7c50-6a01-11d2-b841-00c04fad5171}\fakemodem
+
+[SourceDisksFiles]
+FakeModem.dll=1
+WudfUpdate_$UMDFCOINSTALLERVERSION$.dll=1
+
+[SourceDisksNames]
+1 = %MediaDescription%
+
+; =================== UMDF FakeModem Device ==================================
+
+; The AddReg line below instructs the installer to add the registry 
+; entries listed in the following sections of this INF file:
+; [All], [MfgAddReg], [ExtraCRLFResponses], [ModemX.AddReg], [INTERNAL]
+
+[FakeModem_Install.NT]
+CopyFiles=UMDriverCopy
+AddReg = All, MfgAddReg, ExtraCRLFResponses, ModemX.AddReg, INTERNAL
+
+[FakeModem_Install.NT.hw]
+AddReg = LowerFilterAddReg
+
+[LowerFilterAddReg]
+HKR,,"LowerFilters",0x00010000,WUDFRd
+
+[FakeModem_Install.NT.Services]
+AddService=WUDFRd,0x00000000,WUDFRD_ServiceInstall
+
+[WUDFRD_ServiceInstall]
+DisplayName = %WudfRdDisplayName%
+ServiceType = 1
+StartType = 3
+ErrorControl = 1
+ServiceBinary = %12%\WUDFRd.sys
+
+[FakeModem_Install.NT.CoInstallers]
+CopyFiles=CoInstallers_CopyFiles
+AddReg=CoInstallers_AddReg
+
+[CoInstallers_CopyFiles]
+WudfUpdate_$UMDFCOINSTALLERVERSION$.dll
+
+[CoInstallers_AddReg]
+HKR,,CoInstallers32,0x00010000,"WUDFUpdate_$UMDFCOINSTALLERVERSION$.dll"
+
+[FakeModem_Install.NT.Wdf]
+UmdfService=FakeModem,FakeModem_Install
+UmdfServiceOrder=FakeModem
+UmdfKernelModeClientPolicy = AllowKernelModeClients
+UmdfFsContextUsePolicy = CannotUseFsContexts
+
+[FakeModem_Install]
+UmdfLibraryVersion=$UMDFVERSION$
+ServiceBinary=%12%\UMDF\FakeModem.dll
+DriverCLSID={C8ECC087-6B79-4de5-8FB4-C03358A29617}
+
+[DestinationDirs]
+UMDriverCopy=12,UMDF ; copy to drivers\UMDF
+CoInstallers_CopyFiles=11
+
+[UMDriverCopy]
+FakeModem.dll
+
+;-------------------------------------------------------------------------------------------------------
+; DDK procalc tool can be used to check properties settings which describes modem' properties.
+; Generally, customization entries are added here which override commands from the All section
+
+[ModemX.AddReg]
+HKR,,Properties, 1, 80,01,00,00, ff,00,00,00, ff,00,00,00, 07,00,00,00, 0f,00,00,00, f7,03,00,00, 00,c2,01,00, 40,38,00,00
+HKR,,InactivityScale, 1, 0a,00,00,00
+HKR, Settings, InactivityTimeout,, "S30=<#>"
+HKR, Settings, ErrorControl_On,, "\N3"
+HKR, Settings, ErrorControl_Forced,, "\N2"
+HKR, Settings, Compression_On,, "%%C3"
+HKR, Settings, SpeedNegotiation_Off,, "N0"
+HKR, Settings, SpeedNegotiation_On,, "N1"
+
+;--------------------------------------------------------------------------------------------------------------------------
+;This section will define the type of modem and thus present the appropriate icon in the Device manager
+
+[INTERNAL]
+HKR,, DeviceType, 1, 02
+
+;-------------------------------------------------------------------------------------------------------------------------
+; Responses section contains all of the appropriate and required responses in order for the O/S to understand the 
+; Modem responses to system queries.
+
+[All]
+HKR,,ConfigDialog,,modemui.dll
+HKR,,EnumPropPages,,"modemui.dll,EnumPropPages"
+HKR,,PortSubClass,1,02
+HKR,Init,1,,"AT<cr>"
+HKR,Init, 2,, "AT &F E0 V1 &D2 &C1 S0=0 W2 S95=47<cr>"
+
+[MfgAddReg]
+HKR,, InactivityScale, 1, 01,00,00,00
+HKR, Monitor, 1,, "ATS0=0<cr>"
+HKR, Monitor, 2,, "None"
+HKR, Hangup, 1,, "ATH<cr>"
+HKR, Answer, 1,, "ATA<cr>"
+HKR,, Reset,, "ATZ<cr>"
+HKR, Settings, Prefix,, "AT"
+HKR, Settings, Terminator,, "<cr>"
+HKR, Settings, DialPrefix,, "D"
+HKR, Settings, DialSuffix,, ";"
+HKR, Settings, SpeakerVolume_Low,, "L1"
+HKR, Settings, SpeakerVolume_Med,, "L2"
+HKR, Settings, SpeakerVolume_High,, "L3"
+HKR, Settings, SpeakerMode_Off,, "M0"
+HKR, Settings, SpeakerMode_Dial,, "M1"
+HKR, Settings, SpeakerMode_On,, "M2"
+HKR, Settings, SpeakerMode_Setup,, "M3"
+HKR, Settings, FlowControl_Off,, "&K0"
+HKR, Settings, FlowControl_Hard,, "&K3"
+HKR, Settings, FlowControl_Soft,, "&K4"
+HKR, Settings, ErrorControl_On,, "\N5"
+HKR, Settings, ErrorControl_Off,, "\N0"
+HKR, Settings, ErrorControl_Forced,, "\N4"
+HKR, Settings, Compression_On,, "%%C1"
+HKR, Settings, Compression_Off,, "%%C0"
+HKR, Settings, Modulation_CCITT,, "B0 "
+HKR, Settings, Modulation_Bell,, "B1 "
+HKR, Settings, SpeedNegotiation_Off,, "*S0"
+HKR, Settings, SpeedNegotiation_On,, "*S1"
+HKR, Settings, Pulse,, "P"
+HKR, Settings, Tone,, "T"
+HKR, Settings, Blind_Off,, "X4"
+HKR, Settings, Blind_On,, "X3"
+HKR, Settings, CallSetupFailTimer,, "S7=<#>"
+
+HKR, Responses, "<cr><lf>+FCERROR<cr><lf>", 1, 03, 00, 00,00,00,00, 00,00,00,00
+HKR, Responses, "<cr><lf>BLACKLISTED<cr><lf>", 1, 03, 00, 00,00,00,00, 00,00,00,00 
+HKR, Responses, "<cr><lf>BUSY<cr><lf>", 1, 06, 00, 00,00,00,00, 00,00,00,00 
+
+HKR, Responses, "<cr><lf>CONNECT<cr><lf>", 1, 02, 00, 00,00,00,00, 00,00,00,00
+HKR, Responses, "<cr><lf>DATA<cr><lf>", 1, 03, 00, 00,00,00,00, 00,00,00,00
+HKR, Responses, "<cr><lf>DELAYED<cr><lf>", 1, 03, 00, 00,00,00,00, 00,00,00,00 
+HKR, Responses, "<cr><lf>ERROR<cr><lf>", 1, 03, 00, 00,00,00,00, 00,00,00,00
+
+HKR, Responses, "<cr><lf>FAX<cr><lf>", 1, 03, 00, 00,00,00,00, 00,00,00,00
+HKR, Responses, "<cr><lf>NO ANSWER<cr><lf>", 1, 07, 00, 00,00,00,00, 00,00,00,00 
+HKR, Responses, "<cr><lf>NO CARRIER<cr><lf>", 1, 04, 00, 00,00,00,00, 00,00,00,00 
+HKR, Responses, "<cr><lf>NO DIALTONE<cr><lf>", 1, 05, 00, 00,00,00,00, 00,00,00,00 
+HKR, Responses, "<cr><lf>NOTUSED<cr><lf>", 1, 00, 00, 00,00,00,00, 00,00,00,00 
+HKR, Responses, "<cr><lf>OK<cr><lf>", 1, 00, 00, 00,00,00,00, 00,00,00,00 
+HKR, Responses, "<cr><lf>RING<cr><lf>", 1, 08, 00, 00,00,00,00, 00,00,00,00
+HKR, Responses, "<cr><lf>RINGING<cr><lf>", 1, 01, 00, 00,00,00,00, 00,00,00,00
+HKR, Responses, "0<cr>", 1, 00, 00, 00,00,00,00, 00,00,00,00 ; OK
+HKR, Responses, "1<cr>", 1, 02, 00, 00,00,00,00, 00,00,00,00
+HKR, Responses, "10<cr>", 1, 02, 00, 60,09,00,00, 00,00,00,00
+HKR, Responses, "11<cr>", 1, 02, 00, c0,12,00,00, 00,00,00,00
+HKR, Responses, "12<cr>", 1, 02, 00, 80,25,00,00, 00,00,00,00
+HKR, Responses, "13<cr>", 1, 02, 00, 20,1c,00,00, 00,00,00,00
+HKR, Responses, "14<cr>", 1, 02, 00, e0,2e,00,00, 00,00,00,00
+HKR, Responses, "15<cr>", 1, 02, 00, 40,38,00,00, 00,00,00,00 ; connect at 14400
+HKR, Responses, "2<cr>", 1, 08, 00, 00,00,00,00, 00,00,00,00 ; RING
+HKR, Responses, "3<cr>", 1, 04, 00, 00,00,00,00, 00,00,00,00 ; NO CARRIER
+HKR, Responses, "4<cr>", 1, 03, 00, 00,00,00,00, 00,00,00,00 ; ERROR
+HKR, Responses, "5<cr>", 1, 02, 00, b0,04,00,00, 00,00,00,00
+HKR, Responses, "6<cr>", 1, 05, 00, 00,00,00,00, 00,00,00,00 ; NO DIALTONE
+HKR, Responses, "69<cr>", 1, 01, 03, 00,00,00,00, 00,00,00,00
+HKR, Responses, "7<cr>", 1, 06, 00, 00,00,00,00, 00,00,00,00 ; BUSY
+HKR, Responses, "70<cr>", 1, 01, 01, 00,00,00,00, 00,00,00,00 ; Protocol:None
+HKR, Responses, "77<cr>", 1, 01, 02, 00,00,00,00, 00,00,00,00 ; Protocol:LAPM
+HKR, Responses, "78<cr>", 1, 01, 03, 00,00,00,00, 00,00,00,00 ; Connect V42BIS
+HKR, Responses, "8<cr>", 1, 07, 00, 00,00,00,00, 00,00,00,00 ; NO ANSWER
+HKR, Responses, "80<cr>", 1, 01, 02, 00,00,00,00, 00,00,00,00 ; Protocol:ALT
+HKR, Responses, "81<cr>", 1, 01, 02, 00,00,00,00, 00,00,00,00
+
+[ExtraCRLFResponses]
+HKR, Responses, "<cr><lf><cr><lf>OK<cr><lf>",          1, 00, 00, 00,00,00,00, 00,00,00,00
+HKR, Responses, "<cr><lf><cr><lf>ERROR<cr><lf>",       1, 03, 00, 00,00,00,00, 00,00,00,00
+HKR, Responses, "<cr><lf><cr><lf>BUSY<cr><lf>",        1, 06, 00, 00,00,00,00, 00,00,00,00
+HKR, Responses, "<cr><lf><cr><lf>NO ANSWER<cr><lf>",   1, 07, 00, 00,00,00,00, 00,00,00,00
+HKR, Responses, "<cr><lf><cr><lf>NO CARRIER<cr><lf>",  1, 04, 00, 00,00,00,00, 00,00,00,00
+HKR, Responses, "<cr><lf><cr><lf>NO DIALTONE<cr><lf>", 1, 05, 00, 00,00,00,00, 00,00,00,00
+
+
+; =================== Generic ==================================
+
+[Strings]
+MSFTUMDF="Microsoft"
+MediaDescription="Microsoft Sample Driver Installation Media"
+WudfRdDisplayName="Windows Driver Foundation - User-mode Driver Framework Reflector"
+FakeModemDeviceName="Microsoft Fake Modem User-Mode Device Sample"
diff --git a/serial/VirtualSerial/FakeModem/fakemodem.rc b/serial/VirtualSerial/FakeModem/fakemodem.rc
new file mode 100644
index 00000000..6bb6ed96
--- /dev/null
+++ b/serial/VirtualSerial/FakeModem/fakemodem.rc
@@ -0,0 +1,17 @@
+//---------------------------------------------------------------------------
+// FakeModem.rc
+//
+// Copyright (c) Microsoft Corporation, All Rights Reserved
+//---------------------------------------------------------------------------
+
+
+#include <windows.h>
+#include <ntverp.h>
+
+#define VER_FILETYPE                VFT_DLL
+#define VER_FILESUBTYPE             VFT_UNKNOWN
+#define VER_FILEDESCRIPTION_STR     "WDF:UMDF Fake Modem User-Mode Driver Sample"
+#define VER_INTERNALNAME_STR        "FakeModem"
+#define VER_ORIGINALFILENAME_STR    "FakeModem.dll"
+
+#include "common.ver"
diff --git a/serial/VirtualSerial/FakeModem/fakemodem.vcxproj b/serial/VirtualSerial/FakeModem/fakemodem.vcxproj
new file mode 100644
index 00000000..0eb999de
--- /dev/null
+++ b/serial/VirtualSerial/FakeModem/fakemodem.vcxproj
@@ -0,0 +1,256 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project DefaultTargets="Build" ToolsVersion="12.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup Label="ProjectConfigurations">
+    <ProjectConfiguration Include="Debug|Win32">
+      <Configuration>Debug</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|Win32">
+      <Configuration>Release</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Debug|x64">
+      <Configuration>Debug</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|x64">
+      <Configuration>Release</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+  </ItemGroup>
+  <PropertyGroup Label="Globals">
+    <ProjectGuid>{8C65DE8E-4978-4EC0-8C6B-3C8BEF8FE281}</ProjectGuid>
+    <RootNamespace>$(MSBuildProjectName)</RootNamespace>
+    <UMDF_VERSION_MAJOR>1</UMDF_VERSION_MAJOR>
+    <Configuration Condition="'$(Configuration)' == ''">Debug</Configuration>
+    <Platform Condition="'$(Platform)' == ''">Win32</Platform>
+    <SampleGuid>{BDA85DC8-F904-4FBD-B19D-160DD1CF4C3F}</SampleGuid>
+  </PropertyGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
+  <PropertyGroup Label="Configuration" Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <TargetVersion>Windows10</TargetVersion>
+    <UseDebugLibraries>False</UseDebugLibraries>
+    <DriverTargetPlatform>Desktop</DriverTargetPlatform>
+    <DriverType>UMDF</DriverType>
+    <PlatformToolset>WindowsUserModeDriver10.0</PlatformToolset>
+    <ConfigurationType>DynamicLibrary</ConfigurationType>
+  </PropertyGroup>
+  <PropertyGroup Label="Configuration" Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <TargetVersion>Windows10</TargetVersion>
+    <UseDebugLibraries>True</UseDebugLibraries>
+    <DriverTargetPlatform>Desktop</DriverTargetPlatform>
+    <DriverType>UMDF</DriverType>
+    <PlatformToolset>WindowsUserModeDriver10.0</PlatformToolset>
+    <ConfigurationType>DynamicLibrary</ConfigurationType>
+  </PropertyGroup>
+  <PropertyGroup Label="Configuration" Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
+    <TargetVersion>Windows10</TargetVersion>
+    <UseDebugLibraries>False</UseDebugLibraries>
+    <DriverTargetPlatform>Desktop</DriverTargetPlatform>
+    <DriverType>UMDF</DriverType>
+    <PlatformToolset>WindowsUserModeDriver10.0</PlatformToolset>
+    <ConfigurationType>DynamicLibrary</ConfigurationType>
+  </PropertyGroup>
+  <PropertyGroup Label="Configuration" Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
+    <TargetVersion>Windows10</TargetVersion>
+    <UseDebugLibraries>True</UseDebugLibraries>
+    <DriverTargetPlatform>Desktop</DriverTargetPlatform>
+    <DriverType>UMDF</DriverType>
+    <PlatformToolset>WindowsUserModeDriver10.0</PlatformToolset>
+    <ConfigurationType>DynamicLibrary</ConfigurationType>
+  </PropertyGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
+  <PropertyGroup>
+    <OutDir>$(IntDir)</OutDir>
+  </PropertyGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" />
+  </ImportGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" />
+  </ImportGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" />
+  </ImportGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" />
+  </ImportGroup>
+  <ItemGroup Label="WrappedTaskItems">
+    <ClCompile Include="..\dllsup.cpp; ..\comsup.cpp; ..\driver.cpp; ..\device.cpp; ..\queue.cpp; ..\ringbuffer.cpp">
+      <WppEnabled>true</WppEnabled>
+      <WppDllMacro>true</WppDllMacro>
+      <WppScanConfigurationData>..\internal.h</WppScanConfigurationData>
+    </ClCompile>
+    <Inf Include="fakemodem.inx">
+      <Architecture>$(InfArch)</Architecture>
+      <SpecifyArchitecture>true</SpecifyArchitecture>
+      <CopyOutput>.\$(IntDir)\fakemodem.inf</CopyOutput>
+    </Inf>
+    <OtherWpp Include="fakemodem.rc">
+      <WppEnabled>true</WppEnabled>
+      <WppDllMacro>true</WppDllMacro>
+      <WppScanConfigurationData>..\internal.h</WppScanConfigurationData>
+    </OtherWpp>
+  </ItemGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <TargetName>fakemodem</TargetName>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <TargetName>fakemodem</TargetName>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
+    <TargetName>fakemodem</TargetName>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
+    <TargetName>fakemodem</TargetName>
+  </PropertyGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <ClCompile>
+      <PreprocessorDefinitions>%(PreprocessorDefinitions);_FAKE_MODEM=1;_UNICODE;UNICODE</PreprocessorDefinitions>
+    </ClCompile>
+    <Midl>
+      <PreprocessorDefinitions>%(PreprocessorDefinitions);_FAKE_MODEM=1;_UNICODE;UNICODE</PreprocessorDefinitions>
+    </Midl>
+    <ResourceCompile>
+      <PreprocessorDefinitions>%(PreprocessorDefinitions);_FAKE_MODEM=1;_UNICODE;UNICODE</PreprocessorDefinitions>
+    </ResourceCompile>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <ClCompile>
+      <PreprocessorDefinitions>%(PreprocessorDefinitions);_FAKE_MODEM=1;_UNICODE;UNICODE</PreprocessorDefinitions>
+    </ClCompile>
+    <Midl>
+      <PreprocessorDefinitions>%(PreprocessorDefinitions);_FAKE_MODEM=1;_UNICODE;UNICODE</PreprocessorDefinitions>
+    </Midl>
+    <ResourceCompile>
+      <PreprocessorDefinitions>%(PreprocessorDefinitions);_FAKE_MODEM=1;_UNICODE;UNICODE</PreprocessorDefinitions>
+    </ResourceCompile>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
+    <ClCompile>
+      <PreprocessorDefinitions>%(PreprocessorDefinitions);_FAKE_MODEM=1;_UNICODE;UNICODE</PreprocessorDefinitions>
+    </ClCompile>
+    <Midl>
+      <PreprocessorDefinitions>%(PreprocessorDefinitions);_FAKE_MODEM=1;_UNICODE;UNICODE</PreprocessorDefinitions>
+    </Midl>
+    <ResourceCompile>
+      <PreprocessorDefinitions>%(PreprocessorDefinitions);_FAKE_MODEM=1;_UNICODE;UNICODE</PreprocessorDefinitions>
+    </ResourceCompile>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
+    <ClCompile>
+      <PreprocessorDefinitions>%(PreprocessorDefinitions);_FAKE_MODEM=1;_UNICODE;UNICODE</PreprocessorDefinitions>
+    </ClCompile>
+    <Midl>
+      <PreprocessorDefinitions>%(PreprocessorDefinitions);_FAKE_MODEM=1;_UNICODE;UNICODE</PreprocessorDefinitions>
+    </Midl>
+    <ResourceCompile>
+      <PreprocessorDefinitions>%(PreprocessorDefinitions);_FAKE_MODEM=1;_UNICODE;UNICODE</PreprocessorDefinitions>
+    </ResourceCompile>
+  </ItemDefinitionGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <WIN32_WINNT_VERSION>0x0A00</WIN32_WINNT_VERSION>
+    <NTDDI_VERSION>0x0A000000</NTDDI_VERSION>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <WIN32_WINNT_VERSION>0x0A00</WIN32_WINNT_VERSION>
+    <NTDDI_VERSION>0x0A000000</NTDDI_VERSION>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
+    <WIN32_WINNT_VERSION>0x0A00</WIN32_WINNT_VERSION>
+    <NTDDI_VERSION>0x0A000000</NTDDI_VERSION>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
+    <WIN32_WINNT_VERSION>0x0A00</WIN32_WINNT_VERSION>
+    <NTDDI_VERSION>0x0A000000</NTDDI_VERSION>
+  </PropertyGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <Link>
+      <EntryPointSymbol Condition="'$(Platform)'=='win32'">_DllMainCRTStartup@12</EntryPointSymbol>
+      <EntryPointSymbol Condition="'$(Platform)'!='win32'">_DllMainCRTStartup</EntryPointSymbol>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <Link>
+      <EntryPointSymbol Condition="'$(Platform)'=='win32'">_DllMainCRTStartup@12</EntryPointSymbol>
+      <EntryPointSymbol Condition="'$(Platform)'!='win32'">_DllMainCRTStartup</EntryPointSymbol>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
+    <Link>
+      <EntryPointSymbol Condition="'$(Platform)'=='win32'">_DllMainCRTStartup@12</EntryPointSymbol>
+      <EntryPointSymbol Condition="'$(Platform)'!='win32'">_DllMainCRTStartup</EntryPointSymbol>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
+    <Link>
+      <EntryPointSymbol Condition="'$(Platform)'=='win32'">_DllMainCRTStartup@12</EntryPointSymbol>
+      <EntryPointSymbol Condition="'$(Platform)'!='win32'">_DllMainCRTStartup</EntryPointSymbol>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <ClCompile>
+      <TreatWarningAsError>true</TreatWarningAsError>
+      <WarningLevel>Level4</WarningLevel>
+      <ExceptionHandling>
+      </ExceptionHandling>
+    </ClCompile>
+    <Link>
+      <AdditionalDependencies>%(AdditionalDependencies);$(SDK_LIB_PATH)\strsafe.lib;$(SDK_LIB_PATH)\ntdll.lib;$(SDK_LIB_PATH)\kernel32.lib;$(SDK_LIB_PATH)\advapi32.lib;$(SDK_LIB_PATH)\Ole32.lib;$(SDK_LIB_PATH)\setupapi.lib</AdditionalDependencies>
+      <ModuleDefinitionFile>exports.def</ModuleDefinitionFile>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <ClCompile>
+      <TreatWarningAsError>true</TreatWarningAsError>
+      <WarningLevel>Level4</WarningLevel>
+      <ExceptionHandling>
+      </ExceptionHandling>
+    </ClCompile>
+    <Link>
+      <AdditionalDependencies>%(AdditionalDependencies);$(SDK_LIB_PATH)\strsafe.lib;$(SDK_LIB_PATH)\ntdll.lib;$(SDK_LIB_PATH)\kernel32.lib;$(SDK_LIB_PATH)\advapi32.lib;$(SDK_LIB_PATH)\Ole32.lib;$(SDK_LIB_PATH)\setupapi.lib</AdditionalDependencies>
+      <ModuleDefinitionFile>exports.def</ModuleDefinitionFile>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
+    <ClCompile>
+      <TreatWarningAsError>true</TreatWarningAsError>
+      <WarningLevel>Level4</WarningLevel>
+      <ExceptionHandling>
+      </ExceptionHandling>
+    </ClCompile>
+    <Link>
+      <AdditionalDependencies>%(AdditionalDependencies);$(SDK_LIB_PATH)\strsafe.lib;$(SDK_LIB_PATH)\ntdll.lib;$(SDK_LIB_PATH)\kernel32.lib;$(SDK_LIB_PATH)\advapi32.lib;$(SDK_LIB_PATH)\Ole32.lib;$(SDK_LIB_PATH)\setupapi.lib</AdditionalDependencies>
+      <ModuleDefinitionFile>exports.def</ModuleDefinitionFile>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
+    <ClCompile>
+      <TreatWarningAsError>true</TreatWarningAsError>
+      <WarningLevel>Level4</WarningLevel>
+      <ExceptionHandling>
+      </ExceptionHandling>
+    </ClCompile>
+    <Link>
+      <AdditionalDependencies>%(AdditionalDependencies);$(SDK_LIB_PATH)\strsafe.lib;$(SDK_LIB_PATH)\ntdll.lib;$(SDK_LIB_PATH)\kernel32.lib;$(SDK_LIB_PATH)\advapi32.lib;$(SDK_LIB_PATH)\Ole32.lib;$(SDK_LIB_PATH)\setupapi.lib</AdditionalDependencies>
+      <ModuleDefinitionFile>exports.def</ModuleDefinitionFile>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemGroup>
+    <ResourceCompile Include="fakemodem.rc" />
+  </ItemGroup>
+  <ItemGroup>
+    <Inf Exclude="@(Inf)" Include="*.inf" />
+    <FilesToPackage Include="$(TargetPath)" Condition="'$(ConfigurationType)'=='Driver' or '$(ConfigurationType)'=='DynamicLibrary'" />
+    <FilesToPackage Include="@(Inf->'%(CopyOutput)')" Condition="'@(Inf)'!=''" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Exclude="@(None)" Include="*.txt;*.htm;*.html" />
+    <None Exclude="@(None)" Include="*.ico;*.cur;*.bmp;*.dlg;*.rct;*.gif;*.jpg;*.jpeg;*.wav;*.jpe;*.tiff;*.tif;*.png;*.rc2" />
+    <None Exclude="@(None)" Include="*.def;*.bat;*.hpj;*.asmx" />
+  </ItemGroup>
+  <ItemGroup>
+    <ClInclude Exclude="@(ClInclude)" Include="*.h;*.hpp;*.hxx;*.hm;*.inl;*.xsd" />
+  </ItemGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
+</Project>
+\ No newline at end of file
diff --git a/serial/VirtualSerial/FakeModem/fakemodem.vcxproj.Filters b/serial/VirtualSerial/FakeModem/fakemodem.vcxproj.Filters
new file mode 100644
index 00000000..1471427c
--- /dev/null
+++ b/serial/VirtualSerial/FakeModem/fakemodem.vcxproj.Filters
@@ -0,0 +1,57 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup>
+    <Filter Include="Source Files">
+      <Extensions>cpp;c;cc;cxx;def;odl;idl;hpj;bat;asm;asmx;*</Extensions>
+      <UniqueIdentifier>{171E6CE6-A3BC-4E0C-A70B-3D3A14E3013E}</UniqueIdentifier>
+    </Filter>
+    <Filter Include="Header Files">
+      <Extensions>h;hpp;hxx;hm;inl;inc;xsd</Extensions>
+      <UniqueIdentifier>{7D188E14-FC54-4649-BF86-227A339DF62D}</UniqueIdentifier>
+    </Filter>
+    <Filter Include="Resource Files">
+      <Extensions>rc;ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe;resx;tiff;tif;png;wav;mfcribbon-ms;man;xml</Extensions>
+      <UniqueIdentifier>{376804A3-5F06-4C4D-8E78-89D50B462EA5}</UniqueIdentifier>
+    </Filter>
+    <Filter Include="Driver Files">
+      <Extensions>inf;inv;inx;mof;mc;</Extensions>
+      <UniqueIdentifier>{CD2DEFBB-4830-410C-8909-649347BC8898}</UniqueIdentifier>
+    </Filter>
+  </ItemGroup>
+  <ItemGroup>
+    <ClCompile Include="..\comsup.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\device.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\dllsup.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\driver.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\queue.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\ringbuffer.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <None Include="exports.def">
+      <Filter>Source Files</Filter>
+    </None>
+  </ItemGroup>
+  <ItemGroup>
+    <FilesToPackage Include=".\Debug\\fakemodem.inf">
+      <Filter>Driver Files</Filter>
+    </FilesToPackage>
+    <Inf Include="fakemodem.inx">
+      <Filter>Driver Files</Filter>
+    </Inf>
+  </ItemGroup>
+  <ItemGroup>
+    <ResourceCompile Include="fakemodem.rc">
+      <Filter>Resource Files</Filter>
+    </ResourceCompile>
+  </ItemGroup>
+</Project>
+\ No newline at end of file
diff --git a/serial/VirtualSerial/ReadMe.md b/serial/VirtualSerial/ReadMe.md
new file mode 100644
index 00000000..2b1bc513
--- /dev/null
+++ b/serial/VirtualSerial/ReadMe.md
@@ -0,0 +1,59 @@
+Virtual serial driver sample
+============================
+
+This sample demonstrates these two serial drivers:
+
+-   A simple virtual serial driver (ComPort)
+-   A controller-less modem driver (FakeModem).This driver supports sending and receiving AT commands using the ReadFile and WriteFile calls or via a TAPI interface using an application such as, HyperTerminal.
+
+This sample driver is a minimal driver meant to demonstrate the usage of the User-Mode Driver Framework. It is not intended for use in a production environment.
+
+For more information, see [Serial Controller and Device Drivers](http://msdn.microsoft.com/en-us/library/windows/hardware/ff546939) in the WDK documentation.
+
+Code tour
+---------
+
+File manifest
+
+Description
+
+comsup.cpp & comsup.h
+
+COM Support code - specifically base classes which provide implementations for the standard COM interfaces **IUnknown** and **IClassFactory** which are used throughout the sample.
+
+The implementation of **IClassFactory** is designed to create instances of the CMyDriver class. If you should change the name of your base driver class, you would also need to modify this file.
+
+dllsup.cpp
+
+DLL Support code - provides the DLL's entry point as well as the single required export (**DllGetClassObject**).
+
+These depend on comsup.cpp to perform the necessary class creation.
+
+exports.def
+
+This file lists the functions that the driver DLL exports.
+
+internal.h
+
+This is the main header file for the sample driver.
+
+driver.cpp & driver.h
+
+Definition and implementation of the driver callback class (CMyDriver) for the sample. This includes **DriverEntry** and events on the framework driver object.
+
+device.cpp & driver.h
+
+Definition and implementation of the device callback class (CMyDriver) for the sample. This includes events on the framework device object.
+
+queue.cpp & queue.h
+
+Definition and implementation of the base queue callback class (CMyQueue). This includes events on the framework I/O queue object.
+
+VirtualSerial.rc /FakeModem.rc
+
+This file defines resource information for the sample driver.
+
+VirtualSerial.inf / FakeModem.inf
+
+INF file that contains installation information for this driver.
+
diff --git a/serial/VirtualSerial/VirtualSerial.sln b/serial/VirtualSerial/VirtualSerial.sln
new file mode 100644
index 00000000..e682dae3
--- /dev/null
+++ b/serial/VirtualSerial/VirtualSerial.sln
@@ -0,0 +1,46 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 2013
+VisualStudioVersion = 12.0
+MinimumVisualStudioVersion = 12.0
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "ComPort", "ComPort", "{6C0EE406-586D-4B80-BB5D-DAF3113ECF24}"
+EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "FakeModem", "FakeModem", "{E25B6521-5167-4BB2-B779-8C56A9B9B980}"
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "virtualserial", "ComPort\virtualserial.vcxproj", "{EFB282A8-A881-44E7-964D-F068A4FD19C9}"
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "fakemodem", "FakeModem\fakemodem.vcxproj", "{8C65DE8E-4978-4EC0-8C6B-3C8BEF8FE281}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Win32 = Debug|Win32
+		Release|Win32 = Release|Win32
+		Debug|x64 = Debug|x64
+		Release|x64 = Release|x64
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{EFB282A8-A881-44E7-964D-F068A4FD19C9}.Debug|Win32.ActiveCfg = Debug|Win32
+		{EFB282A8-A881-44E7-964D-F068A4FD19C9}.Debug|Win32.Build.0 = Debug|Win32
+		{EFB282A8-A881-44E7-964D-F068A4FD19C9}.Release|Win32.ActiveCfg = Release|Win32
+		{EFB282A8-A881-44E7-964D-F068A4FD19C9}.Release|Win32.Build.0 = Release|Win32
+		{EFB282A8-A881-44E7-964D-F068A4FD19C9}.Debug|x64.ActiveCfg = Debug|x64
+		{EFB282A8-A881-44E7-964D-F068A4FD19C9}.Debug|x64.Build.0 = Debug|x64
+		{EFB282A8-A881-44E7-964D-F068A4FD19C9}.Release|x64.ActiveCfg = Release|x64
+		{EFB282A8-A881-44E7-964D-F068A4FD19C9}.Release|x64.Build.0 = Release|x64
+		{8C65DE8E-4978-4EC0-8C6B-3C8BEF8FE281}.Debug|Win32.ActiveCfg = Debug|Win32
+		{8C65DE8E-4978-4EC0-8C6B-3C8BEF8FE281}.Debug|Win32.Build.0 = Debug|Win32
+		{8C65DE8E-4978-4EC0-8C6B-3C8BEF8FE281}.Release|Win32.ActiveCfg = Release|Win32
+		{8C65DE8E-4978-4EC0-8C6B-3C8BEF8FE281}.Release|Win32.Build.0 = Release|Win32
+		{8C65DE8E-4978-4EC0-8C6B-3C8BEF8FE281}.Debug|x64.ActiveCfg = Debug|x64
+		{8C65DE8E-4978-4EC0-8C6B-3C8BEF8FE281}.Debug|x64.Build.0 = Debug|x64
+		{8C65DE8E-4978-4EC0-8C6B-3C8BEF8FE281}.Release|x64.ActiveCfg = Release|x64
+		{8C65DE8E-4978-4EC0-8C6B-3C8BEF8FE281}.Release|x64.Build.0 = Release|x64
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(NestedProjects) = preSolution
+		{EFB282A8-A881-44E7-964D-F068A4FD19C9} = {6C0EE406-586D-4B80-BB5D-DAF3113ECF24}
+		{8C65DE8E-4978-4EC0-8C6B-3C8BEF8FE281} = {E25B6521-5167-4BB2-B779-8C56A9B9B980}
+	EndGlobalSection
+EndGlobal
diff --git a/serial/VirtualSerial/comsup.cpp b/serial/VirtualSerial/comsup.cpp
new file mode 100644
index 00000000..fd298470
--- /dev/null
+++ b/serial/VirtualSerial/comsup.cpp
@@ -0,0 +1,344 @@
+/*++
+
+Copyright (C) Microsoft Corporation, All Rights Reserved
+
+Module Name:
+
+    ComSup.cpp
+
+Abstract:
+
+    This module contains implementations for the functions and methods 
+    used for providing COM support.
+
+Environment:
+
+    Windows User-Mode Driver Framework (WUDF)
+
+--*/
+
+#include "internal.h"
+
+#include "comsup.tmh"
+
+//
+// Implementation of CUnknown methods.
+//
+
+CUnknown::CUnknown(
+    VOID
+    ) : m_ReferenceCount(1)
+/*++
+
+  Routine Description:
+
+    Constructor for an instance of the CUnknown class.  This simply initializes
+    the reference count of the object to 1.  The caller is expected to 
+    call Release() if it wants to delete the object once it has been allocated.
+
+  Arguments:
+
+    None
+
+  Return Value:
+
+    None
+
+--*/
+{
+    // do nothing.
+}
+
+HRESULT
+STDMETHODCALLTYPE
+CUnknown::QueryInterface(
+    _In_ REFIID InterfaceId,
+    _Out_ PVOID *Object
+    )
+/*++
+ 
+  Routine Description:
+
+    This method provides the basic support for query interface on CUnknown.
+    If the interface requested is IUnknown it references the object and 
+    returns an interface pointer.  Otherwise it returns an error.
+
+  Arguments:
+
+    InterfaceId - the IID being requested
+
+    Object - a location to store the interface pointer to return.
+
+  Return Value:
+
+    S_OK or E_NOINTERFACE
+
+--*/
+{
+    if (IsEqualIID(InterfaceId, __uuidof(IUnknown)))
+    {
+        *Object = QueryIUnknown();
+        return S_OK;
+    }
+    else
+    {
+        *Object = NULL;
+        return E_NOINTERFACE;
+    }
+}
+
+IUnknown *
+CUnknown::QueryIUnknown(
+    VOID
+    )
+/*++
+ 
+  Routine Description:
+
+    This helper method references the object and returns a pointer to the 
+    object's IUnknown interface.
+
+    This allows other methods to convert a CUnknown pointer into an IUnknown
+    pointer without a typecast and without calling QueryInterface and dealing
+    with the return value.
+
+  Arguments:
+
+    None
+
+  Return Value:
+
+    A pointer to the object's IUnknown interface.
+
+--*/
+{
+    AddRef();
+    return static_cast<IUnknown *>(this);
+}
+
+ULONG
+STDMETHODCALLTYPE
+CUnknown::AddRef(
+    VOID
+    )
+/*++
+ 
+  Routine Description:
+
+    This method adds one to the object's reference count.
+
+  Arguments:
+
+    None
+
+  Return Value:
+
+    The new reference count.   The caller should only use this for debugging
+    as the object's actual reference count can change while the caller
+    examines the return value.
+
+--*/
+{
+    return InterlockedIncrement(&m_ReferenceCount);
+}
+
+ULONG
+STDMETHODCALLTYPE
+CUnknown::Release(
+    VOID
+   )
+/*++
+ 
+  Routine Description:
+
+    This method subtracts one to the object's reference count.  If the count
+    goes to zero, this method deletes the object.
+
+  Arguments:
+
+    None
+
+  Return Value:
+
+    The new reference count.   If the caller uses this value it should only be
+    to check for zero (i.e. this call caused or will cause deletion) or 
+    non-zero (i.e. some other call may have caused deletion, but this one 
+    didn't).
+
+--*/
+{
+    ULONG count = InterlockedDecrement(&m_ReferenceCount);
+
+    if (count == 0)
+    {
+        delete this;
+    }
+    return count;
+}
+
+//
+// Implementation of CClassFactory methods.
+//
+
+//
+// Define storage for the factory's static lock count variable.
+//
+
+LONG CClassFactory::s_LockCount = 0;
+
+IClassFactory *
+CClassFactory::QueryIClassFactory(
+    VOID
+    )
+/*++
+ 
+  Routine Description:
+
+    This helper method references the object and returns a pointer to the 
+    object's IClassFactory interface.
+
+    This allows other methods to convert a CClassFactory pointer into an 
+    IClassFactory pointer without a typecast and without dealing with the 
+    return value QueryInterface.
+
+  Arguments:
+
+    None
+
+  Return Value:
+
+    A referenced pointer to the object's IClassFactory interface.
+
+--*/
+{
+    AddRef();
+    return static_cast<IClassFactory *>(this);
+}
+
+HRESULT
+CClassFactory::QueryInterface(
+    _In_ REFIID InterfaceId,
+    _Out_ PVOID *Object
+    )
+/*++
+ 
+  Routine Description:
+
+    This method attempts to retrieve the requested interface from the object.
+
+    If the interface is found then the reference count on that interface (and
+    thus the object itself) is incremented.
+
+  Arguments:
+
+    InterfaceId - the interface the caller is requesting.
+
+    Object - a location to store the interface pointer.
+
+  Return Value:
+
+    S_OK or E_NOINTERFACE
+
+--*/
+{
+    //
+    // This class only supports IClassFactory so check for that.
+    //
+
+    if (IsEqualIID(InterfaceId, __uuidof(IClassFactory)))
+    {
+        *Object = QueryIClassFactory();
+        return S_OK;
+    }
+    else
+    {
+        //
+        // See if the base class supports the interface.
+        //
+
+        return CUnknown::QueryInterface(InterfaceId, Object);
+    }
+}
+
+HRESULT
+STDMETHODCALLTYPE
+CClassFactory::CreateInstance(
+    _In_opt_ IUnknown * /* OuterObject */,
+    _In_ REFIID InterfaceId,
+    _Out_ PVOID *Object
+    )
+/*++
+ 
+  Routine Description:
+
+    This COM method is the factory routine - it creates instances of the driver
+    callback class and returns the specified interface on them.
+
+  Arguments:
+
+    OuterObject - only used for aggregation, which our driver callback class
+                  does not support.
+
+    InterfaceId - the interface ID the caller would like to get from our 
+                  new object.
+
+    Object - a location to store the referenced interface pointer to the new
+             object.
+
+  Return Value:
+
+    Status.
+
+--*/
+{
+    HRESULT hr;
+
+    PCMyDriver driver;
+
+    *Object = NULL;
+
+    hr = CMyDriver::CreateInstance(&driver);
+
+    if (SUCCEEDED(hr)) 
+    {
+        hr = driver->QueryInterface(InterfaceId, Object);
+        driver->Release();
+    }
+
+    return hr;
+}
+
+HRESULT
+STDMETHODCALLTYPE
+CClassFactory::LockServer(
+    _In_ BOOL Lock
+    )
+/*++
+ 
+  Routine Description:
+
+    This COM method can be used to keep the DLL in memory.  However since the
+    driver's DllCanUnloadNow function always returns false, this has little 
+    effect.  Still it tracks the number of lock and unlock operations.
+
+  Arguments:
+
+    Lock - Whether the caller wants to lock or unlock the "server"
+
+  Return Value:
+
+    S_OK
+
+--*/
+{
+    if (Lock)
+    {
+        InterlockedIncrement(&s_LockCount);
+    } 
+    else 
+    {
+        InterlockedDecrement(&s_LockCount);
+    }
+    return S_OK;
+}
+
diff --git a/serial/VirtualSerial/comsup.h b/serial/VirtualSerial/comsup.h
new file mode 100644
index 00000000..a73938b6
--- /dev/null
+++ b/serial/VirtualSerial/comsup.h
@@ -0,0 +1,215 @@
+/*++
+
+Copyright (C) Microsoft Corporation, All Rights Reserved
+
+Module Name:
+
+    ComSup.h
+
+Abstract:
+
+    This module contains classes and functions use for providing COM support
+    code.
+
+Environment:
+
+    Windows User-Mode Driver Framework (WUDF)
+
+--*/
+
+#pragma once
+
+//
+// Forward type declarations.  They are here rather than in internal.h as
+// you only need them if you choose to use these support classes.
+//
+
+typedef class CUnknown *PCUnknown;
+typedef class CClassFactory *PCClassFactory;
+
+//
+// Base class to implement IUnknown.  You can choose to derive your COM
+// classes from this class, or simply implement IUnknown in each of your
+// classes.
+//
+
+class CUnknown : public IUnknown 
+{
+
+//
+// Private data members and methods.  These are only accessible by the methods 
+// of this class.
+//
+private:
+
+    //
+    // The reference count for this object.  Initialized to 1 in the
+    // constructor.
+    //
+
+    LONG m_ReferenceCount;
+
+//
+// Protected data members and methods.  These are accessible by the subclasses 
+// but not by other classes.
+//
+protected:
+
+    //
+    // The constructor and destructor are protected to ensure that only the 
+    // subclasses of CUnknown can create and destroy instances.
+    //
+
+    CUnknown(
+        VOID
+        );
+
+    //
+    // The destructor MUST be virtual.  Since any instance of a CUnknown 
+    // derived class should only be deleted from within CUnknown::Release, 
+    // the destructor MUST be virtual or only CUnknown::~CUnknown will get
+    // invoked on deletion.
+    //
+    // If you see that your CMyDevice specific destructor is never being
+    // called, make sure you haven't deleted the virtual destructor here.
+    //
+
+    virtual 
+    ~CUnknown(
+        VOID
+        )
+    {
+        // Do nothing
+    }
+
+//
+// Public Methods.  These are accessible by any class.
+//
+public:
+
+    IUnknown *
+    QueryIUnknown(
+        VOID
+        );
+
+//
+// COM Methods.
+//
+public:
+
+    //
+    // IUnknown methods
+    //
+
+    virtual
+    ULONG
+    STDMETHODCALLTYPE
+    AddRef(
+        VOID
+        );
+
+    virtual
+    ULONG
+    STDMETHODCALLTYPE
+    Release(
+        VOID
+       );
+
+    virtual
+    HRESULT
+    STDMETHODCALLTYPE
+    QueryInterface(
+        _In_ REFIID InterfaceId,
+        _Out_ PVOID *Object
+        );
+};
+
+//
+// Class factory support class.  Create an instance of this from your 
+// DllGetClassObject method and modify the implementation to create 
+// an instance of your driver event handler class.
+//
+
+class CClassFactory : public CUnknown, public IClassFactory 
+{
+//
+// Private data members and methods.  These are only accessible by the methods 
+// of this class.
+//
+private:
+
+    //
+    // The lock count.  This is shared across all instances of IClassFactory
+    // and can be queried through the public IsLocked method.
+    //
+
+    static LONG s_LockCount;
+
+//
+// Public Methods.  These are accessible by any class.
+//
+public:
+
+    IClassFactory *
+    QueryIClassFactory(
+        VOID
+        );
+
+//
+// COM Methods.
+//
+public:
+
+    //
+    // IUnknown methods
+    //
+
+    virtual
+    ULONG
+    STDMETHODCALLTYPE
+    AddRef(
+        VOID
+        )
+    {
+        return __super::AddRef();
+    }
+    
+    _At_(this, __drv_freesMem(object))
+    virtual
+    ULONG
+    STDMETHODCALLTYPE
+    Release(
+        VOID
+       )
+    {
+        return __super::Release();
+    }
+
+    virtual
+    HRESULT
+    STDMETHODCALLTYPE
+    QueryInterface(
+        _In_ REFIID InterfaceId,
+        _Out_ PVOID *Object
+        );
+
+    //
+    // IClassFactory methods.
+    //
+
+    virtual
+    HRESULT
+    STDMETHODCALLTYPE
+    CreateInstance(
+        _In_opt_ IUnknown *OuterObject,
+        _In_ REFIID InterfaceId,
+        _Out_ PVOID *Object
+        );
+
+    virtual
+    HRESULT
+    STDMETHODCALLTYPE
+    LockServer(
+        _In_ BOOL Lock
+        );
+};
diff --git a/serial/VirtualSerial/device.cpp b/serial/VirtualSerial/device.cpp
new file mode 100644
index 00000000..11d47775
--- /dev/null
+++ b/serial/VirtualSerial/device.cpp
@@ -0,0 +1,674 @@
+/*++
+
+Copyright (C) Microsoft Corporation, All Rights Reserved.
+
+Module Name:
+
+    Device.cpp
+
+Abstract:
+
+    This module contains the implementation of the UMDF VirtualSerial sample 
+    driver's device callback object.
+
+    The VirtualSerial sample device does very little.  It does not implement 
+    either of the PNP interfaces so once the device is setup, it won't ever get
+    any callbacks until the device is removed.
+
+Environment:
+
+   Windows User-Mode Driver Framework (WUDF)
+
+--*/
+
+#include "internal.h"
+#include "device.tmh"
+
+HRESULT
+CMyDevice::CreateInstance(
+    _In_ IWDFDriver *FxDriver,
+    _In_ IWDFDeviceInitialize * FxDeviceInit,
+    _Out_ PCMyDevice *Device
+    )
+/*++
+
+  Routine Description:
+
+    This method creates and initializs an instance of the VirtualSerial driver's
+    device callback object.
+
+  Arguments:
+
+    FxDeviceInit - the settings for the device.
+
+    Device - a location to store the referenced pointer to the device object.
+
+  Return Value:
+
+    Status
+
+--*/
+{
+    PCMyDevice device;
+    HRESULT hr;
+
+    //
+    // Allocate a new instance of the device class.
+    //
+
+    device = new CMyDevice();
+
+    if (NULL == device)
+    {
+        return E_OUTOFMEMORY;
+    }
+
+    //
+    // Initialize the instance.
+    //
+
+    hr = device->Initialize(FxDriver, FxDeviceInit);
+
+    if (SUCCEEDED(hr))
+    {
+        *Device = device;
+    }
+    else
+    {
+        device->Release();
+    }
+
+    return hr;
+}
+
+HRESULT
+CMyDevice::Initialize(
+    _In_ IWDFDriver           * FxDriver,
+    _In_ IWDFDeviceInitialize * FxDeviceInit
+    )
+/*++
+
+  Routine Description:
+
+    This method initializes the device callback object and creates the
+    partner device object.
+
+    The method should perform any device-specific configuration that:
+        *  could fail (these can't be done in the constructor)
+        *  must be done before the partner object is created -or-
+        *  can be done after the partner object is created and which aren't
+           influenced by any device-level parameters the parent (the driver
+           in this case) might set.
+
+  Arguments:
+
+    FxDeviceInit - the settings for this device.
+
+  Return Value:
+
+    status.
+
+--*/
+{
+    IWDFDevice *fxDevice;
+    HRESULT hr;
+
+    //
+    // Configure things like the locking model before we go to create our
+    // partner device.
+    //
+    FxDeviceInit->SetLockingConstraint(WdfDeviceLevel);
+
+    //
+    // Create a new FX device object and assign the new callback object to
+    // handle any device level events that occur.
+    //
+
+    //
+    // QueryIUnknown references the IUnknown interface that it returns
+    // (which is the same as referencing the device).  We pass that to
+    // CreateDevice, which takes its own reference if everything works.
+    //
+
+    {
+        IUnknown *unknown = this->QueryIUnknown();
+
+        hr = FxDriver->CreateDevice(FxDeviceInit, unknown, &fxDevice);
+
+        unknown->Release();
+    }
+
+    //
+    // If that succeeded then set our FxDevice member variable.
+    //
+
+    if (SUCCEEDED(hr))
+    {
+        m_FxDevice = fxDevice;
+
+        //
+        // Drop the reference we got from CreateDevice.  Since this object
+        // is partnered with the framework object they have the same
+        // lifespan - there is no need for an additional reference.
+        //
+
+        fxDevice->Release();
+    }
+
+    return hr;
+}
+
+HRESULT
+CMyDevice::Configure(
+    VOID
+    )
+/*++
+
+  Routine Description:
+
+    This method is called after the device callback object has been initialized
+    and returned to the driver.  It would setup the device's queues and their
+    corresponding callback objects.
+
+  Arguments:
+
+    FxDevice - the framework device object for which we're handling events.
+
+  Return Value:
+
+    status
+
+--*/
+{
+    IWDFPropertyStoreFactory *pPropertyStoreFactory = NULL;
+    IWDFNamedPropertyStore2 * pHardwarePropertyStore = NULL;
+    IWDFNamedPropertyStore2 * pLegacyHardwarePropertyStore = NULL;
+    WDF_PROPERTY_STORE_ROOT RootSpecifier;
+    PROPVARIANT comPortPV;
+    WCHAR portName[] = L"PortName";
+    size_t comPortSuffixCch = 0;
+    WCHAR *comPortFullName = NULL;
+    size_t comPortFullNameCch = 0;
+    WCHAR *pdoName = NULL;
+    PCMyQueue defaultQueue;
+
+#ifdef _FAKE_MODEM
+    //
+    // Compiled as fake modem
+    //
+    LPGUID pGuid = (LPGUID) &GUID_DEVINTERFACE_MODEM;
+#else
+    //
+    // Compiled as virtual serial port
+    //
+    LPGUID pGuid = (LPGUID) &GUID_DEVINTERFACE_COMPORT;
+#endif
+
+    HRESULT hr;
+
+    PropVariantInit(&comPortPV);
+
+    //
+    // Create device interface
+    //
+    hr = m_FxDevice->CreateDeviceInterface(pGuid,
+                                           NULL);
+
+    if (FAILED(hr))
+    {
+        Trace(
+            TRACE_LEVEL_ERROR,
+            L"ERROR: Cannot create device interface (%!GUID!)",
+            pGuid
+            );
+
+        goto Exit;
+    }
+
+    hr = m_FxDevice->AssignDeviceInterfaceState(pGuid,
+                                                NULL,
+                                                TRUE);
+
+    if (FAILED(hr))
+    {
+        Trace(
+            TRACE_LEVEL_ERROR,
+            L"ERROR: Cannot enable device interface (%!GUID!)",
+            pGuid
+            );
+
+        goto Exit;
+    }
+
+    //
+    // Create Symbolic Link
+    //
+
+    //
+    // First we need to read the COM number from the registry
+    //
+
+    hr = m_FxDevice->QueryInterface(IID_PPV_ARGS(&pPropertyStoreFactory));
+
+    if (FAILED(hr))
+    {
+        Trace(
+            TRACE_LEVEL_ERROR,
+            L"ERROR: QI for IWDFPropertyStoreFactory failed"
+            );
+
+        goto Exit;
+    }
+
+    RootSpecifier.LengthCb = sizeof(WDF_PROPERTY_STORE_ROOT);
+    RootSpecifier.RootClass = WdfPropertyStoreRootClassHardwareKey;
+    RootSpecifier.Qualifier.HardwareKey.ServiceName =
+                                           WDF_PROPERTY_STORE_HARDWARE_KEY_ROOT;
+
+    hr = pPropertyStoreFactory->RetrieveDevicePropertyStore(
+                                           &RootSpecifier,
+                                           WdfPropertyStoreNormal,
+                                           KEY_QUERY_VALUE,
+                                           NULL,
+                                           &pHardwarePropertyStore,
+                                           NULL
+                                           );
+
+    if (FAILED(hr))
+    {
+        Trace(
+            TRACE_LEVEL_ERROR,
+            L"ERROR: Failed to retrieve device hardware key root"
+            );
+        goto Exit;
+    }
+
+    hr = pHardwarePropertyStore->GetNamedValue(portName, &comPortPV);
+
+    if (FAILED(hr))
+    {
+        Trace(
+            TRACE_LEVEL_ERROR,
+            L"ERROR: Failed to read value %ws",
+            portName
+            );
+        goto Exit;
+    }
+
+    //
+    // Then we need to construct the COM port name
+    //
+    hr = StringCchLength(comPortPV.pwszVal,
+                         STRSAFE_MAX_CCH,
+                         &comPortSuffixCch);
+
+    if (FAILED(hr))
+    {
+        Trace(
+            TRACE_LEVEL_ERROR,
+            L"ERROR: Overflow while calculating COM port suffix length"
+            );
+        goto Exit;
+    }
+
+    hr = SizeTAdd(ARRAYSIZE(SYMBOLIC_LINK_NAME_PREFIX),
+                            comPortSuffixCch,
+                            &comPortFullNameCch);
+
+    if (FAILED(hr))
+    {
+        Trace(
+            TRACE_LEVEL_ERROR,
+            L"ERROR: Overflow while calculating symbolic link length"
+            );
+        goto Exit;
+    }
+
+    comPortFullName = (WCHAR*) new WCHAR[comPortFullNameCch];
+
+    if (NULL == comPortFullName)
+    {
+        hr = E_OUTOFMEMORY;
+        Trace(
+            TRACE_LEVEL_ERROR,
+            L"ERROR: Unable to allocate memory for full port name"
+            );
+        goto Exit;
+    }
+
+    hr = StringCchPrintf(comPortFullName,
+                         comPortFullNameCch,
+                         L"%ws%ws",
+                         SYMBOLIC_LINK_NAME_PREFIX,
+                         comPortPV.pwszVal);
+
+    if (FAILED(hr))
+    {
+        Trace(
+            TRACE_LEVEL_ERROR,
+            L"ERROR: Cannot create full name for COM port"
+            );
+        goto Exit;
+    }
+
+    //
+    // Finally we create the symbolic link
+    //
+    hr = m_FxDevice->CreateSymbolicLink(comPortFullName);
+
+    if (FAILED(hr))
+    {
+        Trace(
+            TRACE_LEVEL_ERROR,
+            L"ERROR: Cannot create symbolic link %ws",
+            comPortFullName
+            );
+        goto Exit;
+    }
+
+    //
+    // Write the com name to the legacy hardware key
+    //
+    hr = GetPdoName(&pdoName);
+
+    if (FAILED(hr) || (pdoName == NULL))
+    {
+        Trace(
+            TRACE_LEVEL_ERROR,
+            L"ERROR: Cannot retrieve PDO name"
+            );
+        goto Exit;
+    }
+
+    //
+    // Write the name to the legacy hardware key
+    //
+    RootSpecifier.LengthCb = sizeof(WDF_PROPERTY_STORE_ROOT);
+    RootSpecifier.RootClass = WdfPropertyStoreRootClassLegacyHardwareKey;
+    RootSpecifier.Qualifier.LegacyHardwareKey.LegacyMapName = L"SERIALCOMM";
+
+    hr = pPropertyStoreFactory->RetrieveDevicePropertyStore(
+                                           &RootSpecifier,
+                                           WdfPropertyStoreCreateVolatile,
+                                           KEY_SET_VALUE,
+                                           NULL,
+                                           &pLegacyHardwarePropertyStore,
+                                           NULL
+                                           );
+
+    if (FAILED(hr))
+    {
+        Trace(
+            TRACE_LEVEL_ERROR,
+            L"ERROR: Failed to retrieve device legacy hardware key"
+            );
+        goto Exit;
+    }
+
+    hr = pLegacyHardwarePropertyStore->SetNamedValue(pdoName,
+                                                     &comPortPV);
+
+    if (FAILED(hr))
+    {
+        Trace(
+            TRACE_LEVEL_ERROR,
+            L"ERROR: Failed to write device name to legacy hardware key"
+            );
+        goto Exit;
+    }
+
+    m_CreatedLegacyHardwareKey = TRUE;
+    m_LegacyHardwarePropertyStore = pLegacyHardwarePropertyStore;
+    m_PdoName = pdoName;
+    
+    //
+    // Create and configure the queues
+    //
+    hr = CMyQueue::CreateInstance(this, m_FxDevice, &defaultQueue);
+
+    if (FAILED(hr))
+    {
+        Trace(
+            TRACE_LEVEL_ERROR,
+            L"ERROR: Failed to create default queue"
+            );        
+        goto Exit;
+    }
+
+    defaultQueue->Release();    
+    
+    
+Exit:
+
+    if (m_CreatedLegacyHardwareKey == FALSE)
+    {
+        //
+        // If the legacy hardware key has been written, then the cleanup
+        // will happen, when the device is unloaded
+        // 
+        SAFE_RELEASE(pLegacyHardwarePropertyStore);
+        if (pdoName != NULL)
+        {
+            delete[] pdoName;
+        }        
+    }
+    
+    SAFE_RELEASE(pHardwarePropertyStore);
+    SAFE_RELEASE(pPropertyStoreFactory);
+
+    PropVariantClear(&comPortPV);
+
+    if (comPortFullName != NULL)
+    {
+        delete[] comPortFullName;
+    }
+
+    return hr;
+}
+
+HRESULT
+CMyDevice::QueryInterface(
+    _In_ REFIID InterfaceId,
+    _Out_ PVOID *Object
+    )
+/*++
+
+  Routine Description:
+
+    This method is called to get a pointer to one of the object's callback
+    interfaces.
+
+  Arguments:
+
+    InterfaceId - the interface being requested
+
+    Object - a location to store the interface pointer if successful
+
+  Return Value:
+
+    S_OK or E_NOINTERFACE
+
+--*/
+{
+    HRESULT hr;
+
+    if(IsEqualIID(InterfaceId, __uuidof(IObjectCleanup))) 
+    {    
+        *Object = QueryIObjectCleanup();
+        hr = S_OK;  
+    }
+    else
+    {
+        hr = CUnknown::QueryInterface(InterfaceId, Object);
+    }
+    
+    return hr;
+}
+
+VOID 
+CMyDevice::OnCleanup(
+    IWDFObject*  pWdfObject
+)
+{
+    UNREFERENCED_PARAMETER(pWdfObject);
+    
+    if ((m_CreatedLegacyHardwareKey == TRUE) && 
+        (m_LegacyHardwarePropertyStore != NULL))
+    {
+        m_LegacyHardwarePropertyStore->DeleteNamedValue(m_PdoName);
+        SAFE_RELEASE(m_LegacyHardwarePropertyStore);
+        delete[] m_PdoName;
+    }    
+}
+
+HRESULT
+CMyDevice::GetPdoName(
+    _Out_ LPWSTR *PdoName
+    )
+{
+    HRESULT hr = S_OK;
+    WCHAR *devInstId = NULL;
+    ULONG devInstIdLen;
+    HDEVINFO hDevInfoSet = INVALID_HANDLE_VALUE;
+    SP_DEVINFO_DATA devInfoData;
+    WCHAR *pdoName = NULL;
+    DWORD pdoNameCb = 0;
+
+    WUDF_TEST_DRIVER_ASSERT(m_FxDevice);
+
+    //
+    // First let's get the device instance ID
+    //
+    devInstIdLen = 0;
+    hr = m_FxDevice->RetrieveDeviceInstanceId(NULL, &devInstIdLen);
+    if (SUCCEEDED(hr))
+    {
+        devInstId = (WCHAR*) new WCHAR[devInstIdLen];
+        if (NULL == devInstId)
+        {
+            hr = E_OUTOFMEMORY;
+        }
+    }
+    if (SUCCEEDED(hr))
+    {
+        hr = m_FxDevice->RetrieveDeviceInstanceId(devInstId, &devInstIdLen);
+    }
+
+    //
+    // Now use the SetupDiXxx functions to get a handle to the device's 
+    // hardware key
+    //
+    if (SUCCEEDED(hr))
+    {
+        //
+        // Create a new device information set
+        //
+        hDevInfoSet = SetupDiCreateDeviceInfoList(NULL, NULL);
+        if (INVALID_HANDLE_VALUE == hDevInfoSet)
+        {
+            hr = HRESULT_FROM_WIN32(GetLastError());
+        }
+    }
+
+    if (SUCCEEDED(hr))
+    {
+        //
+        // Add our device to this device information set
+        //
+        ZeroMemory(&devInfoData, sizeof(devInfoData));
+        devInfoData.cbSize = sizeof(devInfoData);
+        if (!SetupDiOpenDeviceInfo(hDevInfoSet,
+                                   devInstId,
+                                   NULL,
+                                   0,
+                                   &devInfoData))
+        {
+            hr = HRESULT_FROM_WIN32(GetLastError());
+        }
+    }
+
+    if (SUCCEEDED(hr))
+    {
+        //
+        // Get the length of the PDO name
+        //
+        if (!SetupDiGetDeviceRegistryProperty(hDevInfoSet,
+                                              &devInfoData,
+                                              SPDRP_PHYSICAL_DEVICE_OBJECT_NAME,
+                                              NULL,
+                                              (PBYTE)pdoName,
+                                              0,
+                                              &pdoNameCb))
+        {
+            //
+            // The only reason for this call is to get the length of the
+            // buffer. The only non acceptable reason for failure is, if we
+            // asked for invalid data.
+            //
+            if (GetLastError() == ERROR_INVALID_DATA)
+            {
+                hr = HRESULT_FROM_WIN32(GetLastError());
+            }
+        }
+    }
+    
+    //
+    // Get the PDO name                                 
+    //
+    if (SUCCEEDED(hr))
+    {    
+        pdoName = (WCHAR *)new BYTE[pdoNameCb];
+        
+        if (pdoName == NULL)
+        {
+            hr = E_OUTOFMEMORY;    
+        }
+    }
+        
+    if (SUCCEEDED(hr))
+    {
+        if (!SetupDiGetDeviceRegistryProperty(hDevInfoSet,
+                                              &devInfoData,
+                                              SPDRP_PHYSICAL_DEVICE_OBJECT_NAME,
+                                              NULL,
+                                              (PBYTE)pdoName,
+                                              pdoNameCb,
+                                              NULL))
+        {
+            hr = HRESULT_FROM_WIN32(GetLastError());
+        }                   
+                                         
+    }
+
+    if (SUCCEEDED(hr))
+    {
+        *PdoName = pdoName;
+    }
+
+    //
+    // clean up to be done regardless of success or failure
+    //
+    if (NULL != devInstId)
+    {
+        delete[] devInstId;
+    }
+
+    if (INVALID_HANDLE_VALUE != hDevInfoSet)
+    {
+        SetupDiDestroyDeviceInfoList(hDevInfoSet);
+    }
+
+    //
+    // clean up to be done in case of failure only
+    //
+    if (FAILED(hr))
+    {
+        if (NULL != pdoName)
+        {
+            delete[] pdoName;
+            pdoName = NULL;
+        }
+    }
+
+    return hr;
+}
diff --git a/serial/VirtualSerial/device.h b/serial/VirtualSerial/device.h
new file mode 100644
index 00000000..1fc54aeb
--- /dev/null
+++ b/serial/VirtualSerial/device.h
@@ -0,0 +1,261 @@
+/*++
+
+Copyright (C) Microsoft Corporation, All Rights Reserved
+
+Module Name:
+
+    Device.h
+
+Abstract:
+
+    This module contains the type definitions for the UMDF VirtualSerial sample
+    driver's device callback class.
+
+Environment:
+
+    Windows User-Mode Driver Framework (WUDF)
+
+--*/
+
+#pragma once
+#include "initguid.h"
+#include "serial.h"
+
+DEFINE_GUID(GUID_DEVINTERFACE_MODEM, 0x2c7089aa, 0x2e0e, 0x11d1, 0xb1, 0x14, 0x00, 0xc0, 0x4f, 0xc2, 0xaa, 0xe4);
+DEFINE_GUID(GUID_DEVINTERFACE_COMPORT, 0x86e0d1e0L, 0x8089, 0x11d0, 0x9c, 0xe4, 0x08, 0x00, 0x3e, 0x30, 0x1f, 0x73);
+
+#define SYMBOLIC_LINK_NAME_PREFIX   L"\\DosDevices\\Global\\"
+
+//
+// Class for the VirtualSerial driver.
+//
+
+class CMyDevice : 
+    public CUnknown,
+    public IObjectCleanup
+{
+
+//
+// Private data members.
+//
+private:
+
+    IWDFDevice *m_FxDevice;
+
+    //
+    // Baud rate
+    //
+    ULONG m_BaudRate;
+
+    //
+    // Modem control register
+    //
+    ULONG m_MCR;
+
+    //
+    // FIFO control register
+    //
+    ULONG m_FCR;
+
+    //
+    // Line control register
+    //
+    ULONG m_LCR;
+
+    //
+    // Valid data mask
+    //
+    UCHAR m_ValidDataMask;
+    
+    //
+    // Timeouts
+    //
+    SERIAL_TIMEOUTS m_Timeouts;
+    
+    //
+    // Legacy hardware key property store
+    //
+    BOOL m_CreatedLegacyHardwareKey;
+    
+    IWDFNamedPropertyStore2 * m_LegacyHardwarePropertyStore;
+    
+    PWCHAR m_PdoName;
+//
+// Private methods.
+//
+
+private:
+
+    CMyDevice(
+        VOID
+        ) :
+        m_FxDevice(NULL),
+        m_BaudRate(0),
+        m_MCR(0),
+        m_FCR(0),
+        m_LCR(0),
+        m_ValidDataMask(0),
+        m_CreatedLegacyHardwareKey(FALSE),
+        m_LegacyHardwarePropertyStore(NULL),
+        m_PdoName(NULL)
+    {
+        ZeroMemory(&m_Timeouts, sizeof(SERIAL_TIMEOUTS));
+    }
+
+    HRESULT
+    Initialize(
+        _In_ IWDFDriver *FxDriver,
+        _In_ IWDFDeviceInitialize *FxDeviceInit
+        );
+        
+    HRESULT
+    CMyDevice::GetPdoName(
+        _Out_ LPWSTR *PdoName
+        );
+//
+// Public methods
+//
+public:
+
+    //
+    // The factory method used to create an instance of this driver.
+    //
+
+    static
+    HRESULT
+    CreateInstance(
+        _In_ IWDFDriver *FxDriver,
+        _In_ IWDFDeviceInitialize *FxDeviceInit,
+        _Out_ PCMyDevice *Device
+        );
+
+    HRESULT
+    Configure(
+        VOID
+        );
+
+//
+// COM methods
+//
+public:
+
+    //
+    // IUnknown methods.
+    //
+
+    virtual
+    ULONG
+    STDMETHODCALLTYPE
+    AddRef(
+        VOID
+        )
+    {
+        return __super::AddRef();
+    }
+
+    _At_(this, __drv_freesMem(object))
+    virtual
+    ULONG
+    STDMETHODCALLTYPE
+    Release(
+        VOID
+       )
+    {
+        return __super::Release();
+    }
+
+    virtual
+    HRESULT
+    STDMETHODCALLTYPE
+    QueryInterface(
+        _In_ REFIID InterfaceId,
+        _Out_ PVOID *Object
+        );
+        
+    //
+    // IObjectCleanup
+    //
+    IObjectCleanup *
+    QueryIObjectCleanup(
+        VOID
+        )
+    {
+        AddRef();
+        return static_cast<IObjectCleanup *>(this);
+    }    
+    
+    virtual
+    void
+    STDMETHODCALLTYPE
+    OnCleanup(
+        IWDFObject*  pWdfObject
+        );
+    
+        
+    ULONG
+    GetBaudRate(
+        VOID
+        )
+    {
+        return m_BaudRate;
+    }
+
+    void
+    SetBaudRate(
+        _In_ ULONG BaudRate
+        )
+    {
+        m_BaudRate = BaudRate;
+
+        return;
+    }
+
+    ULONG *
+    GetModemControlRegisterPtr(
+        VOID
+        )
+    {
+        return &m_MCR;
+    }
+
+    ULONG *
+    GetFifoControlRegisterPtr(
+        VOID
+        )
+    {
+        return &m_FCR;
+    }
+
+    ULONG *
+    GetLineControlRegisterPtr(
+        VOID
+        )
+    {
+        return &m_LCR;
+    }
+
+    VOID
+    SetValidDataMask(
+        _In_ UCHAR Mask
+        )
+    {
+        m_ValidDataMask = Mask;
+    }        
+    
+    VOID
+    SetTimeouts(
+        _In_ SERIAL_TIMEOUTS Timeouts
+        )
+    {
+        m_Timeouts = Timeouts;
+    }
+    
+    VOID
+    GetTimeouts(
+        _Out_ SERIAL_TIMEOUTS *Timeouts
+        )
+    {
+       *Timeouts = m_Timeouts;;
+    }
+    
+};
diff --git a/serial/VirtualSerial/dllsup.cpp b/serial/VirtualSerial/dllsup.cpp
new file mode 100644
index 00000000..6c254085
--- /dev/null
+++ b/serial/VirtualSerial/dllsup.cpp
@@ -0,0 +1,177 @@
+/*++
+
+Copyright (C) Microsoft Corporation, All Rights Reserved.
+
+Module Name:
+
+    dllsup.cpp
+
+Abstract:
+
+    This module contains the implementation of the UMDF VirtualSerial Sample
+    Driver's entry point and its exported functions for providing COM support.
+
+    This module can be copied without modification to a new UMDF driver.  It
+    depends on some of the code in comsup.cpp & comsup.h to handle DLL
+    registration and creating the first class factory.
+
+    This module is dependent on the following defines:
+
+        MYDRIVER_TRACING_ID -      A wide string passed to WPP when initializing
+                                   tracing.  For example, VirtualSerial uses
+                                   L"Microsoft\\UMDF\\VirtualSerial"
+
+        MYDRIVER_CLASS_ID -   A GUID encoded in struct format used to
+                              initialize the driver's ClassID.
+
+    These are defined in internal.h for the sample.  If you choose
+    to use a different primary include file, you should ensure they are
+    defined there as well.
+
+Environment:
+
+    WDF User-Mode Driver Framework (WDF:UMDF)
+
+--*/
+
+#include "internal.h"
+#include "dllsup.tmh"
+
+const GUID CLSID_MyDriverCoClass = MYDRIVER_CLASS_ID;
+
+BOOL
+WINAPI
+DllMain(
+    HINSTANCE ModuleHandle,
+    DWORD Reason,
+    PVOID /* Reserved */
+   )
+/*++
+
+  Routine Description:
+
+    This is the entry point and exit point for the I/O trace driver.  This
+    does very little as the I/O trace driver has minimal global data.
+
+    This method initializes tracing.
+
+  Arguments:
+
+    ModuleHandle - the DLL handle for this module.
+
+    Reason - the reason this entry point was called.
+
+    Reserved - unused
+
+  Return Value:
+
+    TRUE
+
+--*/
+{
+
+    UNREFERENCED_PARAMETER( ModuleHandle );
+
+    if (DLL_PROCESS_ATTACH == Reason)
+    {
+        //
+        // Initialize tracing.
+        //
+
+        WPP_INIT_TRACING(MYDRIVER_TRACING_ID);
+
+    }
+    else if (DLL_PROCESS_DETACH == Reason)
+    {
+        //
+        // Cleanup tracing.
+        //
+
+        WPP_CLEANUP();
+    }
+
+    return TRUE;
+}
+
+HRESULT
+STDAPICALLTYPE
+DllGetClassObject(
+    _In_ REFCLSID ClassId,
+    _In_ REFIID InterfaceId,
+    _Outptr_ LPVOID *Interface
+    )
+/*++
+
+  Routine Description:
+
+    This routine is called by COM in order to instantiate the
+    driver callback object and do an initial query interface on it.
+
+    This method only creates an instance of the driver's class factory, as this
+    is the minimum required to support UMDF.
+
+  Arguments:
+
+    ClassId - the CLSID of the object being "gotten"
+
+    InterfaceId - the interface the caller wants from that object.
+
+    Interface - a location to store the referenced interface pointer
+
+  Return Value:
+
+    S_OK if the function succeeds or error indicating the cause of the
+    failure.
+
+--*/
+{
+    PCClassFactory factory;
+
+    HRESULT hr = S_OK;
+
+    *Interface = NULL;
+
+    //
+    // If the CLSID doesn't match that of our "coclass" (defined in the IDL
+    // file) then we can't create the object the caller wants.  This may
+    // indicate that the COM registration is incorrect, and another CLSID
+    // is referencing this drvier.
+    //
+
+    if (IsEqualCLSID(ClassId, CLSID_MyDriverCoClass) == false)
+    {
+        Trace(
+            TRACE_LEVEL_ERROR,
+            L"ERROR: Called to create instance of unrecognized class (%!GUID!)",
+            &ClassId
+            );
+
+        return CLASS_E_CLASSNOTAVAILABLE;
+    }
+
+    //
+    // Create an instance of the class factory for the caller.
+    //
+
+    factory = new CClassFactory();
+
+    if (NULL == factory)
+    {
+        hr = E_OUTOFMEMORY;
+    }
+
+    //
+    // Query the object we created for the interface the caller wants.  After
+    // that we release the object.  This will drive the reference count to
+    // 1 (if the QI succeeded an referenced the object) or 0 (if the QI failed).
+    // In the later case the object is automatically deleted.
+    //
+
+    if (SUCCEEDED(hr))
+    {
+        hr = factory->QueryInterface(InterfaceId, Interface);
+        factory->Release();
+    }
+
+    return hr;
+}
diff --git a/serial/VirtualSerial/driver.cpp b/serial/VirtualSerial/driver.cpp
new file mode 100644
index 00000000..0ec28ec5
--- /dev/null
+++ b/serial/VirtualSerial/driver.cpp
@@ -0,0 +1,220 @@
+/*++
+ 
+Copyright (C) Microsoft Corporation, All Rights Reserved.
+
+Module Name:
+
+    Driver.cpp
+
+Abstract:
+
+    This module contains the implementation of the UMDF VirtualSerial Sample's 
+    core driver callback object.
+
+Environment:
+
+   Windows User-Mode Driver Framework (WUDF)
+
+--*/
+
+#include "internal.h"
+#include "driver.tmh"
+
+HRESULT
+CMyDriver::CreateInstance(
+    _Out_ PCMyDriver *Driver
+    )
+/*++
+ 
+  Routine Description:
+
+    This static method is invoked in order to create and initialize a new 
+    instance of the driver class.  The caller should arrange for the object
+    to be released when it is no longer in use.
+
+  Arguments:
+
+    Driver - a location to store a referenced pointer to the new instance
+
+  Return Value:
+
+    S_OK if successful, or error otherwise.
+
+--*/
+{
+    PCMyDriver driver;
+    HRESULT hr;
+
+    //
+    // Allocate the callback object.
+    //
+
+    driver = new CMyDriver();
+
+    if (NULL == driver)
+    {
+        return E_OUTOFMEMORY;
+    }
+        
+    //
+    // Initialize the callback object.
+    //
+
+    hr = driver->Initialize();
+
+    if (SUCCEEDED(hr)) 
+    {
+        //
+        // Store a pointer to the new, initialized object in the output 
+        // parameter.
+        //
+
+        *Driver = driver;
+    }
+    else 
+    {
+
+        //
+        // Release the reference on the driver object to get it to delete 
+        // itself.
+        //
+
+        driver->Release();
+    }
+
+    return hr;
+}
+
+HRESULT
+CMyDriver::Initialize(
+    VOID
+    )
+/*++
+ 
+  Routine Description:
+
+    This method is called to initialize a newly created driver callback object
+    before it is returned to the creator.  Unlike the constructor, the 
+    Initialize method contains operations which could potentially fail.
+
+  Arguments:
+
+    None
+
+  Return Value:
+
+    None
+
+--*/
+{
+    return S_OK;
+}
+
+HRESULT
+CMyDriver::QueryInterface(
+    _In_ REFIID InterfaceId,
+    _Out_ PVOID *Interface
+    )
+/*++
+ 
+  Routine Description:
+
+    This method returns a pointer to the requested interface on the callback
+    object..
+
+  Arguments:
+
+    InterfaceId - the IID of the interface to query/reference
+
+    Interface - a location to store the interface pointer.
+
+  Return Value:
+
+    S_OK if the interface is supported.
+    E_NOINTERFACE if it is not supported.
+
+--*/
+{
+    if (IsEqualIID(InterfaceId, __uuidof(IDriverEntry)))
+    {
+        *Interface = QueryIDriverEntry();
+        return S_OK;
+    }
+    else
+    {
+        return CUnknown::QueryInterface(InterfaceId, Interface);
+    }
+}
+
+HRESULT
+CMyDriver::OnDeviceAdd(
+    _In_ IWDFDriver *FxWdfDriver,
+    _In_ IWDFDeviceInitialize *FxDeviceInit
+    )
+/*++
+ 
+  Routine Description:
+
+    The FX invokes this method when it wants to install our driver on a device
+    stack.  This method creates a device callback object, then calls the Fx
+    to create an Fx device object and associate the new callback object with
+    it.
+
+  Arguments:
+
+    FxWdfDriver - the Fx driver object.
+
+    FxDeviceInit - the initialization information for the device.
+
+  Return Value:
+
+    status
+
+--*/
+{
+    HRESULT hr;
+
+    PCMyDevice device = NULL;
+
+    //
+    // TODO: Do any per-device initialization (reading settings from the 
+    //       registry for example) that's necessary before creating your 
+    //       device callback object here.  Otherwise you can leave such 
+    //       initialization to the initialization of the device event 
+    //       handler.
+    //
+
+    //
+    // Create a new instance of our device callback object 
+    //
+
+    hr = CMyDevice::CreateInstance(FxWdfDriver, FxDeviceInit, &device);
+
+    //
+    // TODO: Change any per-device settings that the object exposes before
+    //       calling Configure to let it complete its initialization.
+    //
+
+    //
+    // If that succeeded then call the device's construct method.  This 
+    // allows the device to create any queues or other structures that it
+    // needs now that the corresponding fx device object has been created.
+    //
+
+    if (SUCCEEDED(hr)) 
+    {
+        hr = device->Configure();
+    }
+
+    // 
+    // Release the reference on the device callback object now that it's been
+    // associated with an fx device object.
+    //
+
+    if (NULL != device)
+    {
+        device->Release();
+    }
+
+    return hr;
+}
diff --git a/serial/VirtualSerial/driver.h b/serial/VirtualSerial/driver.h
new file mode 100644
index 00000000..5be609b1
--- /dev/null
+++ b/serial/VirtualSerial/driver.h
@@ -0,0 +1,149 @@
+/*++
+
+Copyright (C) Microsoft Corporation, All Rights Reserved
+
+Module Name:
+
+    Driver.h
+
+Abstract:
+
+    This module contains the type definitions for the UMDF VirtualSerial sample's
+    driver callback class.
+
+Environment:
+
+    Windows User-Mode Driver Framework (WUDF)
+
+--*/
+
+#pragma once
+
+//
+// This class handles driver events for the VirtualSerial sample.  In particular
+// it supports the OnDeviceAdd event, which occurs when the driver is called
+// to setup per-device handlers for a new device stack.
+//
+
+class CMyDriver : public CUnknown, public IDriverEntry
+{
+//
+// Private data members.
+//
+private:
+
+//
+// Private methods.
+//
+private:
+
+    //
+    // Returns a refernced pointer to the IDriverEntry interface.
+    //
+
+    IDriverEntry *
+    QueryIDriverEntry(
+        VOID
+        )
+    {
+        AddRef();
+        return static_cast<IDriverEntry*>(this);
+    }
+
+    HRESULT
+    Initialize(
+        VOID
+        );
+
+//
+// Public methods
+//
+public:
+
+    //
+    // The factory method used to create an instance of this driver.
+    //
+
+    static
+    HRESULT
+    CreateInstance(
+        _Out_ PCMyDriver *Driver
+        );
+
+//
+// COM methods
+//
+public:
+
+    //
+    // IDriverEntry methods
+    //
+
+    virtual
+    HRESULT
+    STDMETHODCALLTYPE
+    OnInitialize(
+        _In_ IWDFDriver *FxWdfDriver
+        )
+    {
+        UNREFERENCED_PARAMETER( FxWdfDriver );
+
+        return S_OK;
+    }
+
+    virtual
+    HRESULT
+    STDMETHODCALLTYPE
+    OnDeviceAdd(
+        _In_ IWDFDriver *FxWdfDriver,
+        _In_ IWDFDeviceInitialize *FxDeviceInit
+        );
+
+    virtual
+    VOID
+    STDMETHODCALLTYPE
+    OnDeinitialize(
+        _In_ IWDFDriver *FxWdfDriver
+        )
+    {
+        UNREFERENCED_PARAMETER( FxWdfDriver );
+
+        return;
+    }
+
+    //
+    // IUnknown methods.
+    //
+    // We have to implement basic ones here that redirect to the
+    // base class becuase of the multiple inheritance.
+    //
+
+    virtual
+    ULONG
+    STDMETHODCALLTYPE
+    AddRef(
+        VOID
+        )
+    {
+        return __super::AddRef();
+    }
+
+    _At_(this, __drv_freesMem(object))
+    virtual
+    ULONG
+    STDMETHODCALLTYPE
+    Release(
+        VOID
+       )
+    {
+        return __super::Release();
+    }
+
+    virtual
+    HRESULT
+    STDMETHODCALLTYPE
+    QueryInterface(
+        _In_ REFIID InterfaceId,
+        _Out_ PVOID *Object
+        );
+};
diff --git a/serial/VirtualSerial/internal.h b/serial/VirtualSerial/internal.h
new file mode 100644
index 00000000..dd89de21
--- /dev/null
+++ b/serial/VirtualSerial/internal.h
@@ -0,0 +1,133 @@
+/*++
+
+Copyright (C) Microsoft Corporation, All Rights Reserved
+
+Module Name:
+
+    Internal.h
+
+Abstract:
+
+    This module contains the local type definitions for the UMDF VirtualSerial
+    driver sample.
+
+Environment:
+
+    Windows User-Mode Driver Framework (WUDF)
+
+--*/
+
+#pragma once
+
+#include <windows.h>
+#include <devioctl.h>
+#include <ntddser.h>
+#include <setupapi.h>
+#include <strsafe.h>
+#include <intsafe.h>
+
+//
+// Include the WUDF DDI
+//
+
+#include "wudfddi.h"
+
+//
+// Use specstrings for in/out annotation of function parameters.
+//
+
+#include "specstrings.h"
+
+//
+// Forward definitions of classes in the other header files.
+//
+
+typedef class CMyDriver    *PCMyDriver;
+typedef class CMyDevice    *PCMyDevice;
+typedef class CMyQueue     *PCMyQueue;
+typedef class CRingBuffer  *PCMyRingBuffer;
+
+//
+// Define useful macros
+//
+
+#ifndef ARRAY_SIZE
+#define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
+#endif
+
+#define SAFE_RELEASE(p)     {if ((p)) { (p)->Release(); (p) = NULL; }}
+
+//
+// Define the tracing flags.
+//
+
+#define WPP_CONTROL_GUIDS                                                   \
+    WPP_DEFINE_CONTROL_GUID(                                                \
+        MyDriverTraceControl, (C31877A2,C8C8,4c58,B5B8,7D6311D5E343),       \
+                                                                            \
+        WPP_DEFINE_BIT(MYDRIVER_ALL_INFO)                                   \
+        )
+
+#define WPP_FLAG_LEVEL_LOGGER(flag, level)                                  \
+    WPP_LEVEL_LOGGER(flag)
+
+#define WPP_FLAG_LEVEL_ENABLED(flag, level)                                 \
+    (WPP_LEVEL_ENABLED(flag) &&                                             \
+     WPP_CONTROL(WPP_BIT_ ## flag).Level >= level)
+
+//
+// This comment block is scanned by the trace preprocessor to define our
+// Trace function.
+//
+// begin_wpp config
+// FUNC Trace{FLAG=MYDRIVER_ALL_INFO}(LEVEL, MSG, ...);
+// end_wpp
+//
+
+//
+// Driver specific #defines
+//
+
+#define MYDRIVER_TRACING_ID L"Microsoft\\UMDF\\VirtualSerial"
+#define MYDRIVER_CLASS_ID   { 0xc8ecc087, 0x6b79, 0x4de5, { 0x8f, 0xb4, 0xc0, 0x33, 0x58, 0xa2, 0x96, 0x17 } }
+
+__forceinline 
+#ifdef _PREFAST_
+__declspec(noreturn)
+#endif
+VOID
+WdfTestNoReturn(
+    VOID
+    )
+{
+    // do nothing.
+}
+
+#define WUDF_TEST_DRIVER_ASSERT(p)  \
+{                                   \
+    if ( !(p) )                     \
+    {                               \
+        DebugBreak();               \
+        WdfTestNoReturn();          \
+    }                               \
+}
+
+#define MAXULONG    0xffffffff
+
+//
+// Device states
+//
+#define COMMAND_MATCH_STATE_IDLE   0
+#define COMMAND_MATCH_STATE_GOT_A  1
+#define COMMAND_MATCH_STATE_GOT_T  2
+
+//
+// Include the type specific headers.
+//
+
+#include "comsup.h"
+#include "driver.h"
+#include "device.h"
+#include "ringbuffer.h"
+#include "queue.h"
+#include "serial.h"
diff --git a/serial/VirtualSerial/queue.cpp b/serial/VirtualSerial/queue.cpp
new file mode 100644
index 00000000..5a7b5bad
--- /dev/null
+++ b/serial/VirtualSerial/queue.cpp
@@ -0,0 +1,1188 @@
+/*++
+
+Copyright (c) Microsoft Corporation, All Rights Reserved
+
+Module Name:
+
+    queue.cpp
+
+Abstract:
+
+    This file implements the I/O queue interface and performs
+    the read/write/ioctl operations.
+
+Environment:
+
+    Windows User-Mode Driver Framework (WUDF)
+
+--*/
+
+
+#include "internal.h"
+
+//
+// IUnknown implementation
+//
+
+//
+// Queue destructor.
+// Free up the buffer, wait for thread to terminate and
+// delete critical section.
+//
+
+
+CMyQueue::~CMyQueue(
+    VOID
+    )
+/*++
+
+Routine Description:
+
+
+    IUnknown implementation of Release
+
+Arguments:
+
+
+Return Value:
+
+--*/
+{
+        WUDF_TEST_DRIVER_ASSERT(m_Device);
+
+        m_Device->Release();
+}
+
+
+//
+// Initialize
+HRESULT
+CMyQueue::CreateInstance(
+    _In_  CMyDevice *pDevice,
+    _In_ IWDFDevice *FxDevice,
+    _Out_ PCMyQueue *Queue
+    )
+/*++
+
+Routine Description:
+
+
+    CreateInstance creates an instance of the queue object.
+
+Arguments:
+
+    ppUkwn - OUT parameter is an IUnknown interface to the queue object
+
+Return Value:
+
+    HRESULT indicating success or failure
+
+--*/
+{
+    CMyQueue *pMyQueue = new CMyQueue(pDevice);
+    HRESULT hr;
+
+    if (pMyQueue == NULL) {
+        return E_OUTOFMEMORY;
+    }
+
+    hr = pMyQueue->Initialize(FxDevice);
+
+    if (SUCCEEDED(hr))
+    {
+        *Queue = pMyQueue;
+    }
+    else
+    {
+        pMyQueue->Release();
+    }
+    return hr;
+}
+
+HRESULT
+CMyQueue::Initialize(
+    _In_ IWDFDevice *FxDevice
+    )
+{
+    IWDFIoQueue *fxQueue;
+    IUnknown *unknown = NULL;
+    HRESULT hr;
+
+    //
+    // Initialize ring buffer
+    //
+
+    hr = m_RingBuffer.Initialize(DATA_BUFFER_SIZE);
+
+    if (FAILED(hr))
+    {
+        goto Exit;
+    }
+
+    unknown = QueryIUnknown();
+
+    //
+    // Create the default queue
+    //
+
+    {
+        hr = FxDevice->CreateIoQueue(unknown,
+                                     TRUE,
+                                     WdfIoQueueDispatchParallel,
+                                     TRUE,
+                                     FALSE,
+                                     &fxQueue);
+    }
+
+    if (FAILED(hr))
+    {
+        goto Exit;
+    }
+
+    m_FxQueue = fxQueue;
+
+    fxQueue->Release();
+
+    //
+    // Create a manual queue to hold pending read requests. By keeping
+    // them in the queue, framework takes care of cancelling them if the app
+    // exits
+    //
+
+    {
+        hr = FxDevice->CreateIoQueue(NULL,
+                                     FALSE,
+                                     WdfIoQueueDispatchManual,
+                                     TRUE,
+                                     FALSE,
+                                     &fxQueue);
+    }
+
+    if (FAILED(hr))
+    {
+        goto Exit;
+    }
+
+    m_FxReadQueue = fxQueue;
+
+    fxQueue->Release();
+
+    //
+    // Create a manual queue to hold pending ioctl wait-on-mask requests.
+    //
+
+    {
+        hr = FxDevice->CreateIoQueue(NULL,
+                                     FALSE,
+                                     WdfIoQueueDispatchManual,
+                                     TRUE,
+                                     FALSE,
+                                     &fxQueue);
+    }
+
+    if (FAILED(hr))
+    {
+        goto Exit;
+    }
+
+    m_FxWaitMaskQueue = fxQueue;
+
+    fxQueue->Release();
+
+Exit:
+    SAFE_RELEASE(unknown);
+    return hr;
+}
+
+HRESULT
+STDMETHODCALLTYPE
+CMyQueue::QueryInterface(
+    _In_ REFIID InterfaceId,
+    _Out_ PVOID *Object
+    )
+/*++
+
+Routine Description:
+
+
+    Query Interface
+
+Arguments:
+
+    Follows COM specifications
+
+Return Value:
+
+    HRESULT indicating success or failure
+
+--*/
+{
+    HRESULT hr;
+
+
+    if (IsEqualIID(InterfaceId, __uuidof(IQueueCallbackWrite))) {
+        *Object = QueryIQueueCallbackWrite();
+        hr = S_OK;
+    } else if (IsEqualIID(InterfaceId, __uuidof(IQueueCallbackRead))) {
+        *Object = QueryIQueueCallbackRead();
+        hr = S_OK;
+    } else if (IsEqualIID(InterfaceId, __uuidof(IQueueCallbackDeviceIoControl))) {
+        *Object = QueryIQueueCallbackDeviceIoControl();
+        hr = S_OK;
+    } else {
+        hr = CUnknown::QueryInterface(InterfaceId, Object);
+    }
+
+    return hr;
+}
+
+VOID
+STDMETHODCALLTYPE
+CMyQueue::OnDeviceIoControl(
+    _In_ IWDFIoQueue *pWdfQueue,
+    _In_ IWDFIoRequest *pWdfRequest,
+    _In_ ULONG ControlCode,
+    _In_ SIZE_T InputBufferSizeInBytes,
+    _In_ SIZE_T OutputBufferSizeInBytes
+    )
+/*++
+
+Routine Description:
+
+
+    DeviceIoControl dispatch routine
+
+Arguments:
+
+    pWdfQueue - Framework Queue instance
+    pWdfRequest - Framework Request  instance
+    ControlCode - IO Control Code
+    InputBufferSizeInBytes - Length of input buffer
+    OutputBufferSizeInBytes - Length of output buffer
+
+    Always succeeds DeviceIoIoctl
+Return Value:
+
+    VOID
+
+--*/
+{
+    UNREFERENCED_PARAMETER(OutputBufferSizeInBytes);
+    UNREFERENCED_PARAMETER(InputBufferSizeInBytes);
+    UNREFERENCED_PARAMETER(pWdfQueue);
+
+    HRESULT hr = S_OK;
+    SIZE_T reqCompletionInfo = 0;
+    IWDFMemory *inputMemory = NULL;
+    IWDFMemory *outputMemory = NULL;
+    UINT i;
+
+    WUDF_TEST_DRIVER_ASSERT(pWdfRequest);
+    WUDF_TEST_DRIVER_ASSERT(m_Device);
+
+    switch (ControlCode)
+    {
+        case IOCTL_SERIAL_SET_BAUD_RATE:
+        {
+            //
+            // This is a driver for a virtual serial port. Since there is no
+            // actual hardware, we just store the baud rate and don't do
+            // anything with it.
+            //
+            SERIAL_BAUD_RATE baudRateBuffer = {0};
+
+            pWdfRequest->GetInputMemory(&inputMemory);
+            if (NULL == inputMemory)
+            {
+                hr = HRESULT_FROM_WIN32(ERROR_INVALID_DATA);
+            }
+
+            if (SUCCEEDED(hr))
+            {
+                hr = inputMemory->CopyToBuffer(0,
+                                               (void*) &baudRateBuffer,
+                                               sizeof(SERIAL_BAUD_RATE));
+            }
+
+            if (SUCCEEDED(hr))
+            {
+                m_Device->SetBaudRate(baudRateBuffer.BaudRate);
+            }
+
+            break;
+        }
+        case IOCTL_SERIAL_GET_BAUD_RATE:
+        {
+            SERIAL_BAUD_RATE baudRateBuffer = {0};
+
+            baudRateBuffer.BaudRate = m_Device->GetBaudRate();
+
+            pWdfRequest->GetOutputMemory(&outputMemory);
+            if (NULL == outputMemory)
+            {
+                hr = HRESULT_FROM_WIN32(ERROR_INVALID_DATA);
+            }
+
+            if (SUCCEEDED(hr))
+            {
+                hr = outputMemory->CopyFromBuffer(0,
+                                                  (void*) &baudRateBuffer,
+                                                  sizeof(SERIAL_BAUD_RATE));
+            }
+
+            if (SUCCEEDED(hr))
+            {
+                reqCompletionInfo = sizeof(SERIAL_BAUD_RATE);
+            }
+
+            break;
+        }
+        case IOCTL_SERIAL_SET_MODEM_CONTROL:
+        {
+            //
+            // This is a driver for a virtual serial port. Since there is no
+            // actual hardware, we just store the modem control register
+            // configuration and don't do anything with it.
+            //
+            ULONG *pModemControlRegister = NULL;
+
+            pWdfRequest->GetInputMemory(&inputMemory);
+            if (NULL == inputMemory)
+            {
+                hr = HRESULT_FROM_WIN32(ERROR_INVALID_DATA);
+            }
+
+            if (SUCCEEDED(hr))
+            {
+                pModemControlRegister = m_Device->GetModemControlRegisterPtr();
+                WUDF_TEST_DRIVER_ASSERT(pModemControlRegister);
+
+                hr = inputMemory->CopyToBuffer(0,
+                                               (void*) pModemControlRegister,
+                                               sizeof(ULONG));
+            }
+
+            break;
+        }
+        case IOCTL_SERIAL_GET_MODEM_CONTROL:
+        {
+            ULONG *pModemControlRegister = NULL;
+
+            pWdfRequest->GetOutputMemory(&outputMemory);
+            if (NULL == outputMemory)
+            {
+                hr = HRESULT_FROM_WIN32(ERROR_INVALID_DATA);
+            }
+
+            if (SUCCEEDED(hr))
+            {
+                pModemControlRegister = m_Device->GetModemControlRegisterPtr();
+                WUDF_TEST_DRIVER_ASSERT(pModemControlRegister);
+
+                hr = outputMemory->CopyFromBuffer(0,
+                                                  (void*) pModemControlRegister,
+                                                  sizeof(ULONG));
+            }
+
+            if (SUCCEEDED(hr))
+            {
+                reqCompletionInfo = sizeof(ULONG);
+            }
+
+            break;
+        }
+        case IOCTL_SERIAL_SET_FIFO_CONTROL:
+        {
+            //
+            // This is a driver for a virtual serial port. Since there is no
+            // actual hardware, we just store the FIFO control register
+            // configuration and don't do anything with it.
+            //
+            ULONG *pFifoControlRegister = NULL;
+
+            pWdfRequest->GetInputMemory(&inputMemory);
+            if (NULL == inputMemory)
+            {
+                hr = HRESULT_FROM_WIN32(ERROR_INVALID_DATA);
+            }
+
+            if (SUCCEEDED(hr))
+            {
+                pFifoControlRegister = m_Device->GetFifoControlRegisterPtr();
+
+                hr = inputMemory->CopyToBuffer(0,
+                                               (void*) pFifoControlRegister,
+                                               sizeof(ULONG));
+            }
+
+            break;
+        }
+        case IOCTL_SERIAL_GET_LINE_CONTROL:
+        {
+            ULONG *pLineControlRegister = NULL;
+            SERIAL_LINE_CONTROL lineControl = {0};
+            ULONG lineControlSnapshot;
+
+            pLineControlRegister = m_Device->GetLineControlRegisterPtr();
+            WUDF_TEST_DRIVER_ASSERT(pLineControlRegister);
+
+            //
+            // Take a snapshot of the line control register variable
+            //
+            lineControlSnapshot = *pLineControlRegister;
+
+            //
+            // Decode the word length
+            //
+            if ((lineControlSnapshot & SERIAL_DATA_MASK) == SERIAL_5_DATA)
+            {
+                lineControl.WordLength = 5;
+            }
+            else if ((lineControlSnapshot & SERIAL_DATA_MASK) == SERIAL_6_DATA)
+            {
+                lineControl.WordLength = 6;
+            }
+            else if ((lineControlSnapshot & SERIAL_DATA_MASK) == SERIAL_7_DATA)
+            {
+                lineControl.WordLength = 7;
+            }
+            else if ((lineControlSnapshot & SERIAL_DATA_MASK) == SERIAL_8_DATA)
+            {
+                lineControl.WordLength = 8;
+            }
+
+            //
+            // Decode the parity
+            //
+            if ((lineControlSnapshot & SERIAL_PARITY_MASK) == SERIAL_NONE_PARITY)
+            {
+                lineControl.Parity = NO_PARITY;
+            }
+            else if ((lineControlSnapshot & SERIAL_PARITY_MASK) == SERIAL_ODD_PARITY)
+            {
+                lineControl.Parity = ODD_PARITY;
+            }
+            else if ((lineControlSnapshot & SERIAL_PARITY_MASK) == SERIAL_EVEN_PARITY)
+            {
+                lineControl.Parity = EVEN_PARITY;
+            }
+            else if ((lineControlSnapshot & SERIAL_PARITY_MASK) == SERIAL_MARK_PARITY)
+            {
+                lineControl.Parity = MARK_PARITY;
+            }
+            else if ((lineControlSnapshot & SERIAL_PARITY_MASK) == SERIAL_SPACE_PARITY)
+            {
+                lineControl.Parity = SPACE_PARITY;
+            }
+
+            //
+            // Decode the length of the stop bit
+            //
+            if (lineControlSnapshot & SERIAL_2_STOP)
+            {
+                if (lineControl.WordLength == 5)
+                {
+                    lineControl.StopBits = STOP_BITS_1_5;
+                }
+                else
+                {
+                    lineControl.StopBits = STOP_BITS_2;
+                }
+            }
+            else
+            {
+                lineControl.StopBits = STOP_BIT_1;
+            }
+
+            //
+            // Copy the information that was decoded to the caller's buffer
+            //
+            pWdfRequest->GetOutputMemory(&outputMemory);
+            if (NULL == outputMemory)
+            {
+                hr = HRESULT_FROM_WIN32(ERROR_INVALID_DATA);
+            }
+
+            if (SUCCEEDED(hr))
+            {
+                hr = outputMemory->CopyFromBuffer(0,
+                                                  (void*) &lineControl,
+                                                  sizeof(SERIAL_LINE_CONTROL));
+            }
+
+            if (SUCCEEDED(hr))
+            {
+                reqCompletionInfo = sizeof(SERIAL_LINE_CONTROL);
+            }
+
+            break;
+        }
+        case IOCTL_SERIAL_SET_LINE_CONTROL:
+        {
+            ULONG *pLineControlRegister = NULL;
+            SERIAL_LINE_CONTROL lineControl = {0};
+            UCHAR lineControlData = 0;
+            UCHAR lineControlStop = 0;
+            UCHAR lineControlParity = 0;
+            ULONG lineControlSnapshot;
+            ULONG lineControlNew;
+            ULONG lineControlPrevious;
+
+            pLineControlRegister = m_Device->GetLineControlRegisterPtr();
+            WUDF_TEST_DRIVER_ASSERT(pLineControlRegister);
+
+            //
+            // This is a driver for a virtual serial port. Since there is no
+            // actual hardware, we just store the line control register
+            // configuration and don't do anything with it.
+            //
+            pWdfRequest->GetInputMemory(&inputMemory);
+            if (NULL == inputMemory)
+            {
+                hr = HRESULT_FROM_WIN32(ERROR_INVALID_DATA);
+            }
+
+            if (SUCCEEDED(hr))
+            {
+                hr = inputMemory->CopyToBuffer(0,
+                                               (void*) &lineControl,
+                                               sizeof(SERIAL_LINE_CONTROL));
+            }
+
+            //
+            // Bits 0 and 1 of the line control register
+            //
+            if (SUCCEEDED(hr))
+            {
+                switch (lineControl.WordLength)
+                {
+                    case 5:
+                        lineControlData = SERIAL_5_DATA;
+                        m_Device->SetValidDataMask(0x1f);
+                        break;
+
+                    case 6:
+                        lineControlData = SERIAL_6_DATA;
+                        m_Device->SetValidDataMask(0x3f);
+                        break;
+
+                    case 7:
+                        lineControlData = SERIAL_7_DATA;
+                        m_Device->SetValidDataMask(0x7f);
+                        break;
+
+                    case 8:
+                        lineControlData = SERIAL_8_DATA;
+                        m_Device->SetValidDataMask(0xff);
+                        break;
+
+                    default:
+                        hr = E_INVALIDARG;
+                }
+            }
+
+            //
+            // Bit 2 of the line control register
+            //
+            if (SUCCEEDED(hr))
+            {
+                switch (lineControl.StopBits)
+                {
+                    case STOP_BIT_1:
+                        lineControlStop = SERIAL_1_STOP;
+                        break;
+
+                    case STOP_BITS_1_5:
+                        if (lineControlData != SERIAL_5_DATA)
+                        {
+                            hr = E_INVALIDARG;
+                            break;
+                        }
+                        lineControlStop = SERIAL_1_5_STOP;
+                        break;
+
+                    case STOP_BITS_2:
+                        if (lineControlData == SERIAL_5_DATA)
+                        {
+                            hr = E_INVALIDARG;
+                            break;
+                        }
+                        lineControlStop = SERIAL_2_STOP;
+                        break;
+
+                    default:
+                        hr = E_INVALIDARG;
+                }
+            }
+
+            //
+            // Bits 3, 4 and 5 of the line control register
+            //
+            if (SUCCEEDED(hr))
+            {
+                switch (lineControl.Parity)
+                {
+                    case NO_PARITY:
+                        lineControlParity = SERIAL_NONE_PARITY;
+                        break;
+
+                    case EVEN_PARITY:
+                        lineControlParity = SERIAL_EVEN_PARITY;
+                        break;
+
+                    case ODD_PARITY:
+                        lineControlParity = SERIAL_ODD_PARITY;
+                        break;
+
+                    case SPACE_PARITY:
+                        lineControlParity = SERIAL_SPACE_PARITY;
+                        break;
+
+                    case MARK_PARITY:
+                        lineControlParity = SERIAL_MARK_PARITY;
+                        break;
+
+                    default:
+                        hr = E_INVALIDARG;
+                }
+            }
+
+            //
+            // Update our line control register variable atomically
+            //
+            i=0;
+            do
+            {
+                i++;
+                if ((i & 0xf) == 0)
+                {
+                    //
+                    // We've been spinning in a loop for a while trying to
+                    // update the line control register variable atomically.
+                    // Yield the CPU for other threads for a while.
+                    //
+                    SwitchToThread();
+                }
+
+                lineControlSnapshot = *pLineControlRegister;
+
+                lineControlNew = (lineControlSnapshot & SERIAL_LCR_BREAK) |
+                                    (lineControlData |
+                                     lineControlParity |
+                                     lineControlStop);
+
+                lineControlPrevious = InterlockedCompareExchange((LONG *) pLineControlRegister,
+                                                                 lineControlNew,
+                                                                 lineControlSnapshot);
+
+            } while (lineControlPrevious != lineControlSnapshot);
+
+            break;
+        }
+        case IOCTL_SERIAL_GET_TIMEOUTS:
+        {
+            SERIAL_TIMEOUTS timeoutValues = {0};
+
+            pWdfRequest->GetOutputMemory(&outputMemory);
+            if (NULL == outputMemory)
+            {
+                hr = HRESULT_FROM_WIN32(ERROR_INVALID_DATA);
+            }
+
+            if (SUCCEEDED(hr))
+            {
+                m_Device->GetTimeouts(&timeoutValues);
+
+                hr = outputMemory->CopyFromBuffer(0,
+                                                  (void*) &timeoutValues,
+                                                  sizeof(timeoutValues));
+            }
+
+            if (SUCCEEDED(hr))
+            {
+                reqCompletionInfo = sizeof(SERIAL_TIMEOUTS);
+            }
+
+            break;
+        }
+        case IOCTL_SERIAL_SET_TIMEOUTS:
+        {
+            SERIAL_TIMEOUTS timeoutValues = {0};
+
+            pWdfRequest->GetInputMemory(&inputMemory);
+            if (NULL == inputMemory)
+            {
+                hr = HRESULT_FROM_WIN32(ERROR_INVALID_DATA);
+            }
+
+            if (SUCCEEDED(hr))
+            {
+                hr = inputMemory->CopyToBuffer(0,
+                                               (void*) &timeoutValues,
+                                               sizeof(timeoutValues));
+            }
+
+            if (SUCCEEDED(hr))
+            {
+                if ((timeoutValues.ReadIntervalTimeout == MAXULONG) &&
+                    (timeoutValues.ReadTotalTimeoutMultiplier == MAXULONG) &&
+                    (timeoutValues.ReadTotalTimeoutConstant == MAXULONG))
+                {
+                    hr = E_INVALIDARG;
+                }
+            }
+
+            if (SUCCEEDED(hr))
+            {
+                m_Device->SetTimeouts(timeoutValues);
+            }
+
+            break;
+        }
+        case IOCTL_SERIAL_WAIT_ON_MASK:
+        {
+            //
+            // NOTE: the contract is that this ioctl should be marked pending
+            // and not to be completed until some wait event happens. Therefore
+            // it is incorrect for the driver to complete the ioctl right away,
+            // no matter whether success or failure is returned. In either case
+            // most likely the app will send down another iocl of wait-on-mask
+            // in a tight loop, and that gets completed again, and again.
+            // The end result will be high CPU utilization in task manager.
+            //
+            // The correct way would be to mark the ioctl as pending, or as in
+            // WDF world, keep it in a manual queue. Since this is a driver for
+            // a virtual serial port and there is no actual hardware, there will
+            // be no wait event happening. The ioctl stays in the queue until
+            // the calling app decides to no longer wait for it by means of
+            // sending down a set-wait-mask request.
+            //
+
+            //
+            // At most one pending wait-on-mask request is expected
+            //
+            IWDFIoRequest *pSavedRequest;
+            hr = m_FxWaitMaskQueue->RetrieveNextRequest(&pSavedRequest);
+            if (SUCCEEDED(hr))
+            {
+                pSavedRequest->Complete(E_FAIL);
+
+                //
+                // RetrieveNextRequest from a manual queue increments the reference
+                // counter by 1. We need to decrement it, otherwise the request will
+                // not be released and there will be an object leak.
+                //
+                SAFE_RELEASE(pSavedRequest);
+            }
+
+            //
+            // Keep the request in a manual queue and the framework will take
+            // care of cancelling them when the app exits.
+            //
+            pWdfRequest->ForwardToIoQueue(m_FxWaitMaskQueue);
+
+            //
+            // Instead of "break" out of the switch statement and complete the
+            // request at the end of this function, use "return" directly.
+            //
+            return;
+        }
+        case IOCTL_SERIAL_SET_WAIT_MASK:
+        {
+            //
+            // NOTE: the contract says a set-wait-mask will cause any pending
+            // wait-on-mask to complete with STATUS_SUCCESS and the output wait
+            // event mask is set to zero. This is also the way for app to break
+            // out of the loop of sending down wait-on-mask
+            //
+
+            IWDFIoRequest *pSavedRequest;
+            hr = m_FxWaitMaskQueue->RetrieveNextRequest(&pSavedRequest);
+            if (SUCCEEDED(hr))
+            {
+                pSavedRequest->GetOutputMemory(&outputMemory);
+                if (NULL == outputMemory)
+                {
+                    hr = HRESULT_FROM_WIN32(ERROR_INVALID_DATA);
+                }
+
+                if (SUCCEEDED(hr))
+                {
+                    ULONG eventMask = 0;
+
+                    hr = outputMemory->CopyFromBuffer(0,
+                                                  (void*) &eventMask,
+                                                  sizeof(eventMask));
+
+                    pSavedRequest->CompleteWithInformation(hr, sizeof(eventMask));
+                }
+                else
+                {
+                    pSavedRequest->Complete(hr);
+                }
+
+                SAFE_RELEASE(pSavedRequest);
+
+                //
+                // outputMemory will be released at the end of the function
+                //
+            }
+
+            //
+            // NOTE: The application expects STATUS_SUCCESS for these IOCTLs.
+            //
+            hr = S_OK;
+
+            break;
+        }
+        case IOCTL_SERIAL_SET_QUEUE_SIZE:
+        case IOCTL_SERIAL_SET_DTR:
+        case IOCTL_SERIAL_SET_RTS:
+        case IOCTL_SERIAL_CLR_RTS:
+        case IOCTL_SERIAL_SET_XON:
+        case IOCTL_SERIAL_SET_XOFF:
+        case IOCTL_SERIAL_SET_CHARS:
+        case IOCTL_SERIAL_GET_CHARS:
+        case IOCTL_SERIAL_GET_HANDFLOW:
+        case IOCTL_SERIAL_SET_HANDFLOW:
+        case IOCTL_SERIAL_RESET_DEVICE:
+        {
+            //
+            // NOTE: The application expects STATUS_SUCCESS for these IOCTLs.
+            //  so don't merge this with default.
+            //
+            break;
+        }
+
+        default:
+        {
+            hr = E_INVALIDARG;
+        }
+    }
+
+    //
+    // clean up
+    //
+    if (inputMemory)
+    {
+        inputMemory->Release();
+    }
+
+    if (outputMemory)
+    {
+        outputMemory->Release();
+    }
+
+    //
+    // complete the request
+    //
+    pWdfRequest->CompleteWithInformation(hr, reqCompletionInfo);
+
+    return;
+}
+
+VOID
+STDMETHODCALLTYPE
+CMyQueue::OnWrite(
+    _In_ IWDFIoQueue *pWdfQueue,
+    _In_ IWDFIoRequest *pWdfRequest,
+    _In_ SIZE_T BytesToWrite
+    )
+/*++
+
+Routine Description:
+
+
+    Write dispatch routine
+    IQueueCallbackWrite
+
+Arguments:
+
+    pWdfQueue - Framework Queue instance
+    pWdfRequest - Framework Request  instance
+    BytesToWrite - Length of bytes in the write buffer
+
+    Allocate and copy data to local buffer
+Return Value:
+
+    VOID
+
+--*/
+{
+    IWDFMemory* pRequestMemory = NULL;
+    IWDFIoRequest* pSavedRequest = NULL;
+    SIZE_T availableData = 0;
+    SIZE_T savedRequestBufferSize = 0;
+    HRESULT hr = S_OK;
+
+    UNREFERENCED_PARAMETER(pWdfQueue);
+
+    //
+    // Get memory object
+    //
+
+    pWdfRequest->GetInputMemory(&pRequestMemory);
+
+    //
+    // Process input
+    //
+
+    ProcessWriteBytes((PUCHAR)pRequestMemory->GetDataBuffer(NULL), BytesToWrite);
+
+    //
+    // Release memory object and complete request
+    //
+    SAFE_RELEASE(pRequestMemory);
+    pWdfRequest->CompleteWithInformation(hr, BytesToWrite);
+
+    //
+    // Get the amount of data available in the ring buffer
+    //
+    m_RingBuffer.GetAvailableData(&availableData);
+
+    if (availableData > 0)
+    {
+        //
+        // Continue with the next request, if there is one pending
+        //
+        hr = m_FxReadQueue->RetrieveNextRequest(&pSavedRequest);
+        if ((pSavedRequest == NULL) || (FAILED(hr)))
+        {
+            goto Exit;
+        }
+
+        pSavedRequest->GetReadParameters(&savedRequestBufferSize, NULL, NULL);
+
+        OnRead(m_FxQueue,
+               pSavedRequest,
+               savedRequestBufferSize);
+
+        //
+        // RetrieveNextRequest from a manual queue increments the reference
+        // counter by 1. We need to decrement it, otherwise the request will
+        // not be released and there will be an object leak.
+        //
+        SAFE_RELEASE(pSavedRequest);
+    }
+
+Exit:
+    return;
+}
+
+VOID
+STDMETHODCALLTYPE
+CMyQueue::OnRead(
+    _In_ IWDFIoQueue *pWdfQueue,
+    _In_ IWDFIoRequest *pWdfRequest,
+    _In_ SIZE_T SizeInBytes
+    )
+/*++
+
+Routine Description:
+
+
+    Read dispatch routine
+    IQueueCallbackRead
+
+Arguments:
+
+    pWdfQueue - Framework Queue instance
+    pWdfRequest - Framework Request  instance
+    SizeInBytes - Length of bytes in the read buffer
+
+    Copy available data into the read buffer
+Return Value:
+
+    VOID
+
+--*/
+{
+    IWDFMemory* pRequestMemory = NULL;
+    SIZE_T BytesCopied = 0;
+    HRESULT     hr;
+
+    UNREFERENCED_PARAMETER(pWdfQueue);
+
+    //
+    // Get memory object
+    //
+    pWdfRequest->GetOutputMemory(&pRequestMemory);
+
+    hr = m_RingBuffer.Read((PBYTE)pRequestMemory->GetDataBuffer(NULL),
+                            SizeInBytes,
+                            &BytesCopied);
+
+    //
+    // Release memory object.
+    //
+    SAFE_RELEASE(pRequestMemory);
+
+    if (FAILED(hr))
+    {
+        //
+        // Error reading buffer
+        //
+        pWdfRequest->Complete(hr);
+        goto Exit;
+    }
+
+    if (BytesCopied > 0)
+    {
+        //
+        // Data was read from buffer succesfully
+        //
+        pWdfRequest->CompleteWithInformation(hr, BytesCopied);
+    }
+    else
+    {
+        //
+        // No data to read. Queue the request for later processing.
+        //
+        pWdfRequest->ForwardToIoQueue(m_FxReadQueue);
+    }
+
+Exit:
+    return;
+}
+
+VOID
+CMyQueue::ProcessWriteBytes(
+    _In_reads_bytes_(Length) PUCHAR Characters,
+    _In_ SIZE_T Length
+    )
+/*++
+Routine Description:
+
+    This function is called when the framework receives IRP_MJ_WRITE
+    requests from the system. The write event handler(FmEvtIoWrite) calls ProcessWriteBytes.
+    It parses the Characters passed in and looks for the  for sequences "AT" -ok  ,
+    "ATA" --CONNECT, ATD<number> -- CONNECT and sets the state of the device appropriately.
+    These bytes are placed in the read Buffer to be processed later since this device
+    works in a loopback fashion.
+
+
+Arguments:
+
+    Characters - Pointer to the write IRP's system buffer.
+
+    Length - Length of the IO operation
+                 The default property of the queue is to not dispatch
+                 zero lenght read & write requests to the driver and
+                 complete is with status success. So we will never get
+                 a zero length request.
+
+Return Value:
+
+   VOID
+
+--*/
+
+{
+
+    UCHAR currentCharacter;
+    UCHAR connectString[] = "\r\nCONNECT\r\n";
+    UCHAR connectStringCch = ARRAY_SIZE(connectString) - 1;
+    UCHAR okString[] = "\r\nOK\r\n";
+    UCHAR okStringCch = ARRAY_SIZE(okString) - 1;
+
+    while (Length != 0) {
+
+        currentCharacter = *(Characters++);
+        Length--;
+
+        if(currentCharacter == '\0')
+        {
+            continue;
+        }
+
+        m_RingBuffer.Write(&currentCharacter, sizeof(currentCharacter));
+
+        switch (m_CommandMatchState) {
+            case COMMAND_MATCH_STATE_IDLE:
+                if ((currentCharacter == 'a') || (currentCharacter == 'A'))
+                {
+                    //
+                    //  got an A
+                    //
+                    m_CommandMatchState=COMMAND_MATCH_STATE_GOT_A;
+                    m_ConnectCommand=FALSE;
+                    m_IgnoreNextChar=FALSE;
+                }
+
+            break;
+
+            case COMMAND_MATCH_STATE_GOT_A:
+                if ((currentCharacter == 't') || (currentCharacter == 'T'))
+                {
+                    //
+                    //  got a T
+                    //
+                    m_CommandMatchState=COMMAND_MATCH_STATE_GOT_T;
+                }
+                else
+                {
+                    m_CommandMatchState=COMMAND_MATCH_STATE_IDLE;
+                }
+
+            break;
+
+            case COMMAND_MATCH_STATE_GOT_T:
+
+                if (!m_IgnoreNextChar)
+                {
+                    //
+                    //  the last char was not a special char
+                    //  check for CONNECT command
+                    //
+                    if ((currentCharacter == 'A') || (currentCharacter == 'a'))
+                    {
+
+                        m_ConnectCommand=TRUE;
+                    }
+
+                    if ((currentCharacter == 'D') || (currentCharacter == 'd'))
+                    {
+
+                        m_ConnectCommand=TRUE;
+                    }
+                }
+
+                m_IgnoreNextChar=TRUE;
+
+                if (currentCharacter == '\r')
+                {
+                    //
+                    //  got a CR, send a response to the command
+                    //
+                    m_CommandMatchState = COMMAND_MATCH_STATE_IDLE;
+
+                    if (m_ConnectCommand)
+                    {
+                        //
+                        //  place <cr><lf>CONNECT<cr><lf>  in the buffer
+                        //
+                        m_RingBuffer.Write(connectString, connectStringCch);
+
+                        //
+                        //  connected now raise CD
+                        //
+                        m_CurrentlyConnected = TRUE;
+                        m_ConnectionStateChanged = TRUE;
+
+                    }
+                    else
+                    {
+                        //
+                        //  place <cr><lf>OK<cr><lf>  in the buffer
+                        //
+                        m_RingBuffer.Write(okString, okStringCch);
+                    }
+                }
+
+            break;
+            default:
+            break;
+        }
+    }
+    return;
+}
diff --git a/serial/VirtualSerial/queue.h b/serial/VirtualSerial/queue.h
new file mode 100644
index 00000000..445ee48e
--- /dev/null
+++ b/serial/VirtualSerial/queue.h
@@ -0,0 +1,206 @@
+/*++
+
+Copyright (c) Microsoft Corporation, All Rights Reserved
+
+Module Name:
+
+    queue.h
+
+Abstract:
+
+    This file defines the queue callback interface.
+
+Environment:
+
+    Windows User-Mode Driver Framework (WUDF)
+
+--*/
+
+#pragma once
+
+#include "internal.h"
+
+// Set ring buffer size
+#define DATA_BUFFER_SIZE 1024
+
+//
+// Macro definition for defining IOCTL and FSCTL function control codes.  Note
+// that function codes 0-2047 are reserved for Microsoft Corporation, and
+// 2048-4095 are reserved for customers.
+//
+
+#define CTL_CODE( DeviceType, Function, Method, Access ) (                 \
+    ((DeviceType) << 16) | ((Access) << 14) | ((Function) << 2) | (Method) \
+)
+
+
+//
+// Queue Callback Object.
+//
+
+class CMyQueue :
+    public IQueueCallbackDeviceIoControl,
+    public IQueueCallbackRead,
+    public IQueueCallbackWrite,
+    public CUnknown
+{
+    UCHAR           m_CommandMatchState; // Device state
+    BOOL            m_ConnectCommand;
+    BOOL            m_IgnoreNextChar;
+    BOOL            m_ConnectionStateChanged;
+    BOOL            m_CurrentlyConnected;
+
+    IWDFIoQueue    *m_FxQueue;           // Default parallel queue
+    IWDFIoQueue    *m_FxReadQueue;       // Manual queue for pending reads
+    IWDFIoQueue    *m_FxWaitMaskQueue;   // Manual queue for pending ioctl wait-on-mask
+
+    CRingBuffer    m_RingBuffer;        // Ring buffer for pending data
+
+    PCMyDevice     m_Device;
+
+    CMyQueue(
+        CMyDevice *pDevice
+        ) :
+        m_CommandMatchState(COMMAND_MATCH_STATE_IDLE),
+        m_ConnectCommand(FALSE),
+        m_IgnoreNextChar(FALSE),
+        m_ConnectionStateChanged(FALSE),
+        m_CurrentlyConnected(FALSE),
+        m_FxQueue(NULL),
+        m_FxReadQueue(NULL)
+    {
+        WUDF_TEST_DRIVER_ASSERT(pDevice);
+
+        pDevice->AddRef();
+        m_Device = pDevice;
+    }
+
+    virtual ~CMyQueue();
+
+    HRESULT
+    Initialize(
+        _In_ IWDFDevice *FxDevice
+        );
+
+    VOID
+    CMyQueue::ProcessWriteBytes(
+        _In_reads_bytes_(Length) PUCHAR Characters,
+        _In_ SIZE_T Length
+        );
+
+public:
+
+    static
+    HRESULT
+    CreateInstance(
+        _In_  CMyDevice *pDevice,
+        _In_ IWDFDevice *FxDevice,
+        _Out_ PCMyQueue *Queue
+        );
+
+    HRESULT
+    Configure(
+        VOID
+        )
+    {
+        return S_OK;
+    }
+
+
+    IQueueCallbackDeviceIoControl *
+    QueryIQueueCallbackDeviceIoControl(
+        VOID
+        )
+    {
+        AddRef();
+        return static_cast<IQueueCallbackDeviceIoControl *>(this);
+    }
+
+    IQueueCallbackRead *
+    QueryIQueueCallbackRead(
+        VOID
+        )
+    {
+        AddRef();
+        return static_cast<IQueueCallbackRead *>(this);
+    }
+
+    IQueueCallbackWrite *
+    QueryIQueueCallbackWrite(
+        VOID
+        )
+    {
+        AddRef();
+        return static_cast<IQueueCallbackWrite *>(this);
+    }
+
+    //
+    // IUnknown
+    //
+
+    virtual
+    ULONG
+    STDMETHODCALLTYPE
+    AddRef(
+        VOID
+        ) {
+        return CUnknown::AddRef();
+    }
+
+    _At_(this, __drv_freesMem(object))
+    virtual
+    ULONG
+    STDMETHODCALLTYPE
+    Release(
+        VOID
+        ) {
+        return CUnknown::Release();
+    }
+
+    virtual
+    HRESULT
+    STDMETHODCALLTYPE
+    QueryInterface(
+        _In_ REFIID InterfaceId,
+        _Out_ PVOID *Object
+        );
+
+    //
+    // Wdf Callbacks
+    //
+
+    // IQueueCallbackDeviceIoControl
+    //
+    virtual
+    VOID
+    STDMETHODCALLTYPE
+    OnDeviceIoControl(
+        _In_ IWDFIoQueue *pWdfQueue,
+        _In_ IWDFIoRequest *pWdfRequest,
+        _In_ ULONG ControlCode,
+        _In_ SIZE_T InputBufferSizeInBytes,
+        _In_ SIZE_T OutputBufferSizeInBytes
+        );
+
+    // IQueueCallbackWrite
+    //
+    virtual
+    VOID
+    STDMETHODCALLTYPE
+    OnWrite(
+        _In_ IWDFIoQueue *pWdfQueue,
+        _In_ IWDFIoRequest *pWdfRequest,
+        _In_ SIZE_T NumOfBytesToWrite
+        );
+
+    // IQueueCallbackRead
+    //
+    virtual
+    VOID
+    STDMETHODCALLTYPE
+    OnRead(
+        _In_ IWDFIoQueue *pWdfQueue,
+        _In_ IWDFIoRequest *pWdfRequest,
+        _In_ SIZE_T NumOfBytesToRead
+        );
+};
diff --git a/serial/VirtualSerial/ringbuffer.cpp b/serial/VirtualSerial/ringbuffer.cpp
new file mode 100644
index 00000000..fbbbd6b8
--- /dev/null
+++ b/serial/VirtualSerial/ringbuffer.cpp
@@ -0,0 +1,258 @@
+#include "internal.h"
+
+CRingBuffer::CRingBuffer(
+    VOID
+    ) : m_Size(0),
+        m_Base(NULL),
+        m_End(NULL),
+        m_Head(NULL),
+        m_Tail(NULL)
+{
+    return;
+}
+
+CRingBuffer::~CRingBuffer(
+    VOID
+    )
+{
+    if (m_Base)
+    {
+        delete[] m_Base;
+    }
+}
+
+HRESULT
+CRingBuffer::Initialize(
+    _In_ SIZE_T BufferSize
+    )
+{
+    HRESULT hr = S_OK;
+    PBYTE buffer = NULL;
+
+    if (0 == BufferSize)
+    {
+        hr = E_INVALIDARG;
+    }
+
+    //
+    // Allocate the buffer.
+    //
+    if (SUCCEEDED(hr))
+    {
+        buffer = new BYTE[BufferSize];
+        if (buffer == NULL)
+        {
+            hr = E_OUTOFMEMORY;
+        }
+    }
+
+    //
+    // Initialize the ring buffer pointers.
+    //
+    if (SUCCEEDED(hr))
+    {
+        m_Size = BufferSize;
+        m_Base = buffer;
+        m_End = buffer + BufferSize;
+        m_Head = buffer;
+        m_Tail = buffer;
+    }
+
+    if (FAILED(hr))
+    {
+        if (buffer)
+        {
+            delete[] buffer;
+            m_Base = NULL;
+        }
+    }
+
+    return hr;
+}
+
+HRESULT
+CRingBuffer::Write(
+    _In_reads_bytes_(DataSize) PBYTE Data,
+    _In_ SIZE_T DataSize
+    )
+{
+    SIZE_T availableSpace;
+    SIZE_T bytesToCopy;
+    SIZE_T spaceFromCurrToEnd;
+
+    WUDF_TEST_DRIVER_ASSERT(Data && (0 != DataSize));
+
+    if (m_Tail >= m_End)
+    {
+        return E_UNEXPECTED;
+    }
+
+    //
+    // Get the amount of space available in the buffer
+    //
+    GetAvailableSpace(&availableSpace);
+
+    //
+    // If there is not enough space to fit in all the data passed in by the 
+    // caller then copy as much as possible and throw away the rest
+    //
+    if (availableSpace < DataSize)
+    {
+        bytesToCopy = availableSpace;
+    }
+    else
+    {
+        bytesToCopy = DataSize;
+    }
+
+    if (bytesToCopy)
+    {
+        //
+        // The buffer has some space at least
+        //
+        if ((m_Tail+bytesToCopy) > m_End)
+        {
+            //
+            // The data being written will wrap around the end of the buffer. 
+            // So the copy has to be done in two steps -
+            // * X bytes from current position to end of the buffer
+            // * the remaining (bytesToCopy - X) from the start of the buffer
+            //
+
+            //
+            // The first step of the copy ...
+            //
+            spaceFromCurrToEnd = m_End - m_Tail;
+            CopyMemory(m_Tail, Data, spaceFromCurrToEnd);
+            Data += spaceFromCurrToEnd;
+            bytesToCopy -= spaceFromCurrToEnd;
+
+            //
+            // The second step of the copy ...
+            //
+            CopyMemory(m_Base, Data, bytesToCopy);
+
+            //
+            // Advance the tail pointer 
+            //
+            m_Tail = m_Base + bytesToCopy;
+        }
+        else
+        {
+            //
+            // Data does NOT wrap around the end of the buffer. Just copy it 
+            // over in a single step
+            //
+            CopyMemory(m_Tail, Data, bytesToCopy);
+
+            //
+            // Advance the tail pointer
+            //
+            m_Tail += bytesToCopy;
+            if (m_Tail == m_End)
+            {
+                //
+                // We have exactly reached the end of the buffer. The next 
+                // write should wrap around and start from the beginning.
+                //
+                m_Tail = m_Base;
+            }
+        }
+
+        WUDF_TEST_DRIVER_ASSERT(m_Tail < m_End);
+    }
+
+    return S_OK;
+}
+
+HRESULT
+CRingBuffer::Read(
+    _Out_writes_bytes_to_(DataSize, *BytesCopied) PBYTE Data,
+    _In_ SIZE_T DataSize,
+    _Out_ SIZE_T *BytesCopied
+    )
+{
+    SIZE_T availableData;
+    SIZE_T dataFromCurrToEnd;
+
+    WUDF_TEST_DRIVER_ASSERT(Data && (DataSize != 0));
+
+    if (m_Head >= m_End)
+    {
+        return E_UNEXPECTED;
+    }
+
+    //
+    // Get the amount of data available in the buffer
+    //
+    GetAvailableData(&availableData);
+
+    if (availableData == 0)
+    {
+        *BytesCopied = 0;
+        return S_OK;
+    }
+    
+    if (DataSize > availableData)
+    {
+        DataSize = availableData;
+    }
+    
+    *BytesCopied = DataSize;
+
+    if ((m_Head + DataSize) > m_End)
+    {
+        //
+        // The data requested by the caller is wrapped around the end of the
+        // buffer. So we'll do the copy in two steps -
+        //    * Copy X bytes from the current position to the end buffer into 
+        //      the caller's buffer
+        //    * Copy (DataSize - X) bytes from the beginning to the buffer into
+        //      the caller's buffer
+        //
+
+        //
+        // The first step of the copy ...
+        //
+        dataFromCurrToEnd = m_End - m_Head;
+        CopyMemory(Data, m_Head, dataFromCurrToEnd);
+        Data += dataFromCurrToEnd;
+        DataSize -= dataFromCurrToEnd;
+
+        //
+        // The second step of the copy ...
+        //
+        CopyMemory(Data, m_Base, DataSize);
+
+        //
+        // Advance the head pointer
+        //
+        m_Head = m_Base + DataSize;
+    }
+    else
+    {
+        //
+        // The data in the buffer is NOT wrapped around the end of the buffer.
+        // Simply copy the data over to the caller's buffer in a single step.
+        //
+        CopyMemory(Data, m_Head, DataSize);
+
+        //
+        // Advance the head pointer
+        //
+        m_Head += DataSize;
+        if (m_Head == m_End)
+        {
+            //
+            // We have exactly reached the end of the buffer. The next 
+            // read should wrap around and start from the beginning.
+            //
+            m_Head = m_Base;
+        }
+    }
+
+    WUDF_TEST_DRIVER_ASSERT(m_Head < m_End);
+
+    return S_OK;
+}
+
diff --git a/serial/VirtualSerial/ringbuffer.h b/serial/VirtualSerial/ringbuffer.h
new file mode 100644
index 00000000..130055d9
--- /dev/null
+++ b/serial/VirtualSerial/ringbuffer.h
@@ -0,0 +1,223 @@
+#pragma once
+
+#include "internal.h"
+
+class CRingBuffer
+{
+private:
+                                                           
+    //
+    // Private local variables.
+    //
+
+    //
+    // The size in bytes of the ring buffer.
+    //
+    SIZE_T m_Size;
+
+    //
+    // A pointer to the base of the ring buffer.
+    //
+    PBYTE m_Base;
+
+    //
+    // A pointer to the byte beyond the end of the ring buffer.  Used for
+    // quick comparisons when determining if we need to wrap.
+    //
+    PBYTE m_End;
+
+    //
+    // A pointer to the current read point in the ring buffer.
+    //
+    // Updates to this are not protected by any lock. This is different from 
+    // the write pointer, which is protected by the "pending read pointer" 
+    // lock. The reason for this difference is that in this driver, we do not
+    // keep write requests pending. If there is not enough space to write all
+    // the data that was requested, we write as much as we can and drop the 
+    // rest (lossy data transfer).
+    //
+    // If we had multiple threads modifying this pointer, then that would 
+    // provide yet another reason for protecting updates to the pointer using a
+    // lock. However, in this driver, at any given time we have only one thread
+    // that modifies this pointer (the thread that runs the read callback). 
+    // This is true because we use a sequential queue for read requests. If we
+    // were to change our read queue to be a parallel queue, this would no 
+    // longer be true.
+    //
+    //
+    PBYTE m_Head;
+
+    //
+    // A pointer to the current write point in the ring buffer. 
+    //
+    // Updates to this pointer are protected by the "pending read pointer 
+    // lock", because we do not want a consumer thread to mark a read request 
+    // as pending while we are in the process of writing data to the buffer. 
+    // The reason is that the write that we are currently performing might 
+    // actually supply enough data to satisfy the read request, in which case
+    // it should not be marked pending at all. 
+    // If the read request were to be marked pending in the situation described
+    // above, then we would need some trigger to later retrieve the request and 
+    // complete it. In our driver, arrival of data is the only event that can 
+    // trigger this. So if no more data arrives, the request will remain 
+    // pending forever, even though there is enough data in the buffer to 
+    // complete it. Hence we do not keep a read request pending in situations
+    // where the read buffer contains enough data to satisfy it.
+    //
+    // If we had multiple threads modifying this pointer, then that would 
+    // provide yet another reason for protecting updates to the pointer using a
+    // lock. However, in this driver, at any given time we have only one thread
+    // that modifies this pointer (the thread that runs the write callback). 
+    // This is true because we use a sequential queue for write requests. If we
+    // were to change our write queue to be a parallel queue, this would no 
+    // longer be true.
+    //
+    PBYTE m_Tail;
+
+private:
+
+    //
+    // Private Internal Methods.
+    //
+    void
+    GetAvailableSpace(
+        _Out_ SIZE_T *AvailableSpace
+        )
+    {
+        WUDF_TEST_DRIVER_ASSERT(AvailableSpace);
+
+        PBYTE headSnapshot = NULL;
+        PBYTE tailSnapshot = NULL;
+        PBYTE tailPlusOne = NULL;
+
+        //
+        // Take a snapshot of the head and tail pointers. We will compute the
+        // available space based on this snapshot. This is safe to do in a 
+        // single-producer, single-consumer model, because -
+        //     * A producer will call GetAvailableSpace() to determine whether
+        //       there is enough space to write the data it is trying to write.
+        //       The only other thread that could modify the amount of space 
+        //       available is the consumer thread, which can only increase the
+        //       amount of space available. Hence it is safe for the producer
+        //       to write based on this snapshot.
+        //     * A consumer thread will call GetAvailableSpace() to determine
+        //       whether there is enough data in the buffer for it to read. 
+        //       (Available data = Buffer size - Available space). The only 
+        //       other thread that could modify the amount of space available
+        //       is the producer thread, which can only decrease the amount of
+        //       space available (thereby increasing the amount of data 
+        //       available. Hence it is safe for the consumer to read based on 
+        //       this snapshot.
+        //
+        headSnapshot = m_Head;
+        tailSnapshot = m_Tail;
+
+        //
+        // In order to distinguish between a full buffer and an empty buffer,
+        // we always leave the last byte of the buffer unused. So, an empty
+        // buffer is denoted by -
+        //      tail == head 
+        // ... and a full buffer is denoted by -
+        //      (tail+1) == head
+        //
+        tailPlusOne = ((tailSnapshot+1) == m_End) ? m_Base : (tailSnapshot+1);
+
+        if (tailPlusOne == headSnapshot)
+        {
+            //
+            // Buffer full
+            //
+            *AvailableSpace = 0;
+        }
+        else if (tailSnapshot == headSnapshot)
+        {
+            //
+            // Buffer empty
+            // The -1 in the computation below is to account for the fact that
+            // we always leave the last byte of the ring buffer unused in order
+            // to distinguish between an empty buffer and a full buffer.
+            //
+            *AvailableSpace = m_Size - 1;
+        }
+        else
+        {
+            if (tailSnapshot > headSnapshot)
+            {
+                //
+                // Data has not wrapped around the end of the buffer
+                // The -1 in the computation below is to account for the fact 
+                // that we always leave the last byte of the ring buffer unused
+                // in order to distinguish between an empty buffer and a full
+                // buffer.
+                //
+                *AvailableSpace = m_Size - (tailSnapshot - headSnapshot) - 1;
+            }
+            else
+            {
+                //
+                // Data has wrapped around the end of the buffer
+                // The -1 in the computation below is to account for the fact 
+                // that we always leave the last byte of the ring buffer unused
+                // in order to distinguish between an empty buffer and a full
+                // buffer.
+                //
+                *AvailableSpace = (headSnapshot - tailSnapshot) - 1;
+            }
+        }
+
+        return;
+    }
+
+public:
+
+    //
+    // Public Internal methods.
+    //
+
+    CRingBuffer(
+        VOID
+        );
+
+    ~CRingBuffer(
+        VOID
+        );
+
+    HRESULT
+    Initialize(
+        _In_ SIZE_T BufferSize
+        );
+
+    HRESULT
+    Write(
+        _In_reads_bytes_(DataSize) PBYTE Data,
+        _In_ SIZE_T DataSize
+        );
+    
+    HRESULT
+    Read(
+        _Out_writes_bytes_to_(DataSize, *BytesCopied) PBYTE Data,
+        _In_ SIZE_T DataSize,
+        _Out_ SIZE_T *BytesCopied
+        );
+
+    void
+    GetAvailableData(
+        _Out_ SIZE_T *AvailableData
+        )
+    {
+        SIZE_T availableSpace;
+
+        WUDF_TEST_DRIVER_ASSERT(AvailableData);
+
+        GetAvailableSpace(&availableSpace);
+
+        //
+        // The -1 in the arithmetic below accounts for the fact that we always
+        // keep 1 byte of the ring buffer unused in order to distinguish 
+        // between a full buffer and an empty buffer.
+        //
+        *AvailableData = m_Size - availableSpace - 1;
+
+        return;
+    }
+};
diff --git a/serial/VirtualSerial/serial.h b/serial/VirtualSerial/serial.h
new file mode 100644
index 00000000..0ae91186
--- /dev/null
+++ b/serial/VirtualSerial/serial.h
@@ -0,0 +1,48 @@
+/*++
+
+Module Name :
+
+    serial.h
+
+Abstract:
+
+    Type definitions and data for the serial port driver
+
+Author:
+
+
+--*/
+
+#pragma once
+
+#define SYMBOLIC_NAME_LENGTH        32
+#define SYMBOLIC_LINK_NAME_PREFIX   L"\\DosDevices\\Global\\"
+
+//
+// This defines the bit used to control whether the device is sending
+// a break.  When this bit is set the device is sending a space (logic 0).
+//
+// Most protocols will assume that this is a hangup.
+//
+#define SERIAL_LCR_BREAK    0x40
+
+//
+// These defines are used to set the line control register.
+//
+#define SERIAL_5_DATA       ((UCHAR)0x00)
+#define SERIAL_6_DATA       ((UCHAR)0x01)
+#define SERIAL_7_DATA       ((UCHAR)0x02)
+#define SERIAL_8_DATA       ((UCHAR)0x03)
+#define SERIAL_DATA_MASK    ((UCHAR)0x03)
+
+#define SERIAL_1_STOP       ((UCHAR)0x00)
+#define SERIAL_1_5_STOP     ((UCHAR)0x04) // Only valid for 5 data bits
+#define SERIAL_2_STOP       ((UCHAR)0x04) // Not valid for 5 data bits
+#define SERIAL_STOP_MASK    ((UCHAR)0x04)
+
+#define SERIAL_NONE_PARITY  ((UCHAR)0x00)
+#define SERIAL_ODD_PARITY   ((UCHAR)0x08)
+#define SERIAL_EVEN_PARITY  ((UCHAR)0x18)
+#define SERIAL_MARK_PARITY  ((UCHAR)0x28)
+#define SERIAL_SPACE_PARITY ((UCHAR)0x38)
+#define SERIAL_PARITY_MASK  ((UCHAR)0x38)
author	Dave Wilson <[email protected]>	2015-03-17 19:50:07 -0700
committer	Dave Wilson <[email protected]>	2015-03-17 19:50:07 -0700
commit	97cf5197cf5b882b2c689d8dc2b555f2edf8f418 (patch)
tree	46f3701832d70b420eb0fc0eb93261f9da45db3f /serial/VirtualSerial
parent	ef1905bf1e8825bb31120dfb27e0daf3154d859a (diff)