[edk2,v2,1/1] EmbeddedPkg/Drivers: add virtual keyboard driver

Message ID 1520516088-29994-2-git-send-email-haojian.zhuang@linaro.org
State New
Headers show
Series
  • add virtual keyboard driver
Related show

Commit Message

Haojian Zhuang March 8, 2018, 1:34 p.m.
This driver is used to simulate a keyboard. For example, user
could read GPIO setting or data from RAM address. If the value
matches the expected pattern, it could trigger a key pressed
event.

User needs to implement hooks of PLATFORM_VIRTUAL_KBD_PROTOCOL.
There're 4 hooks in this protocol.
Register(): Quote the interface that user needs. For example, user
needs to locate GPIO protocol if he wants to simulate a GPIO value
as a key.
Reset(): Do the initialization before reading value.
Query(): Read value. If the value matches the expected pattern,
trigger a key pressed event.
Clear(): Clean the value if necessary.

Cc: Leif Lindholm <leif.lindholm@linaro.org>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Haojian Zhuang <haojian.zhuang@linaro.org>
---
 EmbeddedPkg/EmbeddedPkg.dec                                   |    1 +
 EmbeddedPkg/Drivers/VirtualKeyboardDxe/VirtualKeyboardDxe.inf |   60 +
 EmbeddedPkg/Drivers/VirtualKeyboardDxe/ComponentName.h        |  154 +++
 EmbeddedPkg/Drivers/VirtualKeyboardDxe/VirtualKeyboard.h      |  544 +++++++++
 EmbeddedPkg/Include/Protocol/PlatformVirtualKeyboard.h        |   65 ++
 EmbeddedPkg/Drivers/VirtualKeyboardDxe/ComponentName.c        |  188 ++++
 EmbeddedPkg/Drivers/VirtualKeyboardDxe/VirtualKeyboard.c      | 1149 ++++++++++++++++++++
 7 files changed, 2161 insertions(+)

Comments

Leif Lindholm April 30, 2018, 4:59 p.m. | #1
On Thu, Mar 08, 2018 at 09:34:48PM +0800, Haojian Zhuang wrote:
> This driver is used to simulate a keyboard. For example, user

> could read GPIO setting or data from RAM address. If the value

> matches the expected pattern, it could trigger a key pressed

> event.

> 

> User needs to implement hooks of PLATFORM_VIRTUAL_KBD_PROTOCOL.

> There're 4 hooks in this protocol.

> Register(): Quote the interface that user needs. For example, user

> needs to locate GPIO protocol if he wants to simulate a GPIO value

> as a key.

> Reset(): Do the initialization before reading value.

> Query(): Read value. If the value matches the expected pattern,

> trigger a key pressed event.

> Clear(): Clean the value if necessary.

>

> Cc: Leif Lindholm <leif.lindholm@linaro.org>

> Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>

> Contributed-under: TianoCore Contribution Agreement 1.1

> Signed-off-by: Haojian Zhuang <haojian.zhuang@linaro.org>

> ---

>  EmbeddedPkg/EmbeddedPkg.dec                                   |    1 +

>  EmbeddedPkg/Drivers/VirtualKeyboardDxe/VirtualKeyboardDxe.inf |   60 +

>  EmbeddedPkg/Drivers/VirtualKeyboardDxe/ComponentName.h        |  154 +++

>  EmbeddedPkg/Drivers/VirtualKeyboardDxe/VirtualKeyboard.h      |  544 +++++++++

>  EmbeddedPkg/Include/Protocol/PlatformVirtualKeyboard.h        |   65 ++

>  EmbeddedPkg/Drivers/VirtualKeyboardDxe/ComponentName.c        |  188 ++++

>  EmbeddedPkg/Drivers/VirtualKeyboardDxe/VirtualKeyboard.c      | 1149 ++++++++++++++++++++

>  7 files changed, 2161 insertions(+)

> 

> diff --git a/EmbeddedPkg/EmbeddedPkg.dec b/EmbeddedPkg/EmbeddedPkg.dec

> index e48ce2e95bf7..eb135340b173 100644

> --- a/EmbeddedPkg/EmbeddedPkg.dec

> +++ b/EmbeddedPkg/EmbeddedPkg.dec

> @@ -80,6 +80,7 @@ [Protocols.common]

>    gUsbDeviceProtocolGuid =  { 0x021bd2ca, 0x51d2, 0x11e3, {0x8e, 0x56, 0xb7, 0x54, 0x17, 0xc7,  0x0b, 0x44 }}

>    gPlatformGpioProtocolGuid = { 0x52ce9845, 0x5af4, 0x43e2, {0xba, 0xfd, 0x23, 0x08, 0x12, 0x54, 0x7a, 0xc2 }}

>    gAndroidBootImgProtocolGuid = { 0x9859bb19, 0x407c, 0x4f8b, {0xbc, 0xe1, 0xf8, 0xda, 0x65, 0x65, 0xf4, 0xa5 }}

> +  gPlatformVirtualKeyboardProtocolGuid = { 0x0e3606d2, 0x1dc3, 0x4e6f, { 0xbe, 0x65, 0x39, 0x49, 0x82, 0xa2, 0x65, 0x47 }}


I will move that line up one step before pushing.

>  

>  [Ppis]

>    gEdkiiEmbeddedGpioPpiGuid = { 0x21c3b115, 0x4e0b, 0x470c, { 0x85, 0xc7, 0xe1, 0x05, 0xa5, 0x75, 0xc9, 0x7b }}

> diff --git a/EmbeddedPkg/Drivers/VirtualKeyboardDxe/VirtualKeyboardDxe.inf b/EmbeddedPkg/Drivers/VirtualKeyboardDxe/VirtualKeyboardDxe.inf

> new file mode 100644

> index 000000000000..deb54dab6592

> --- /dev/null

> +++ b/EmbeddedPkg/Drivers/VirtualKeyboardDxe/VirtualKeyboardDxe.inf

> @@ -0,0 +1,60 @@

> +## @file

> +# Virtual Keyboard driver.

> +#

> +# Copyright (c) 2018, Linaro Ltd. All rights reserved.<BR>

> +#

> +# This program and the accompanying materials

> +# are licensed and made available under the terms and conditions

> +# of the BSD License which accompanies this distribution.  The

> +# full text of the license may be found at

> +# http://opensource.org/licenses/bsd-license.php

> +#

> +# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,

> +# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

> +#

> +##

> +

> +[Defines]

> +  INF_VERSION                    = 0x00010019

> +  BASE_NAME                      = VirtualKeyboardDxe

> +  FILE_GUID                      = 88079b18-b42b-44aa-a6f2-b83911075e89

> +  MODULE_TYPE                    = UEFI_DRIVER

> +  VERSION_STRING                 = 1.0

> +  ENTRY_POINT                    = InitializeVirtualKeyboard

> +

> +#

> +# The following information is for reference only and not required by the build tools.

> +#

> +#  VALID_ARCHITECTURES           = IA32 X64 IPF ARM AARCH64

> +#

> +#  DRIVER_BINDING                = gVirtualKeyboardDriverBinding

> +#  COMPONENT_NAME                = gVirtualKeyboardComponentName

> +#

> +

> +[Sources.common]

> +  ComponentName.c

> +  VirtualKeyboard.c

> +

> +[Packages]

> +  EmbeddedPkg/EmbeddedPkg.dec

> +  MdePkg/MdePkg.dec

> +  MdeModulePkg/MdeModulePkg.dec


MdeModulePkg before MdePkg.

> +

> +[LibraryClasses]

> +  BaseLib

> +  BaseMemoryLib

> +  DebugLib

> +  IoLib

> +  ReportStatusCodeLib

> +  UefiDriverEntryPoint

> +  UefiBootServicesTableLib


UefiBoot... before UefiDriver...

> +  UefiLib

> +

> +[Protocols]

> +  gEfiDriverBindingProtocolGuid

> +  gEfiSimpleTextInProtocolGuid

> +  gEfiSimpleTextInputExProtocolGuid

> +  gPlatformVirtualKeyboardProtocolGuid

> +

> +[Depex]

> +  TRUE


OK, so, I am reasonably convinced that this driver carries more across
from the Csm BiosKeyboard than is required (what about all of those
Stalls), and it still contains misleading comments about the 8042 (PC
keyboard controller). But I don't have time to go through it all with
a comb right now, and it sort of blocks some of the really nice
Arm BootManager improvements, and it is a useful addition ... so I am
going to push it for now (with the changes mentioned above
implemented).

I would appreciate if we could get back to this later in the year
though.

Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>

Pushed as 1df5fb2d83

/
    Leif
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Patch

diff --git a/EmbeddedPkg/EmbeddedPkg.dec b/EmbeddedPkg/EmbeddedPkg.dec
index e48ce2e95bf7..eb135340b173 100644
--- a/EmbeddedPkg/EmbeddedPkg.dec
+++ b/EmbeddedPkg/EmbeddedPkg.dec
@@ -80,6 +80,7 @@  [Protocols.common]
   gUsbDeviceProtocolGuid =  { 0x021bd2ca, 0x51d2, 0x11e3, {0x8e, 0x56, 0xb7, 0x54, 0x17, 0xc7,  0x0b, 0x44 }}
   gPlatformGpioProtocolGuid = { 0x52ce9845, 0x5af4, 0x43e2, {0xba, 0xfd, 0x23, 0x08, 0x12, 0x54, 0x7a, 0xc2 }}
   gAndroidBootImgProtocolGuid = { 0x9859bb19, 0x407c, 0x4f8b, {0xbc, 0xe1, 0xf8, 0xda, 0x65, 0x65, 0xf4, 0xa5 }}
+  gPlatformVirtualKeyboardProtocolGuid = { 0x0e3606d2, 0x1dc3, 0x4e6f, { 0xbe, 0x65, 0x39, 0x49, 0x82, 0xa2, 0x65, 0x47 }}
 
 [Ppis]
   gEdkiiEmbeddedGpioPpiGuid = { 0x21c3b115, 0x4e0b, 0x470c, { 0x85, 0xc7, 0xe1, 0x05, 0xa5, 0x75, 0xc9, 0x7b }}
diff --git a/EmbeddedPkg/Drivers/VirtualKeyboardDxe/VirtualKeyboardDxe.inf b/EmbeddedPkg/Drivers/VirtualKeyboardDxe/VirtualKeyboardDxe.inf
new file mode 100644
index 000000000000..deb54dab6592
--- /dev/null
+++ b/EmbeddedPkg/Drivers/VirtualKeyboardDxe/VirtualKeyboardDxe.inf
@@ -0,0 +1,60 @@ 
+## @file
+# Virtual Keyboard driver.
+#
+# Copyright (c) 2018, Linaro Ltd. All rights reserved.<BR>
+#
+# This program and the accompanying materials
+# are licensed and made available under the terms and conditions
+# of the BSD License which accompanies this distribution.  The
+# full text of the license may be found at
+# http://opensource.org/licenses/bsd-license.php
+#
+# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+#
+##
+
+[Defines]
+  INF_VERSION                    = 0x00010019
+  BASE_NAME                      = VirtualKeyboardDxe
+  FILE_GUID                      = 88079b18-b42b-44aa-a6f2-b83911075e89
+  MODULE_TYPE                    = UEFI_DRIVER
+  VERSION_STRING                 = 1.0
+  ENTRY_POINT                    = InitializeVirtualKeyboard
+
+#
+# The following information is for reference only and not required by the build tools.
+#
+#  VALID_ARCHITECTURES           = IA32 X64 IPF ARM AARCH64
+#
+#  DRIVER_BINDING                = gVirtualKeyboardDriverBinding
+#  COMPONENT_NAME                = gVirtualKeyboardComponentName
+#
+
+[Sources.common]
+  ComponentName.c
+  VirtualKeyboard.c
+
+[Packages]
+  EmbeddedPkg/EmbeddedPkg.dec
+  MdePkg/MdePkg.dec
+  MdeModulePkg/MdeModulePkg.dec
+
+[LibraryClasses]
+  BaseLib
+  BaseMemoryLib
+  DebugLib
+  IoLib
+  ReportStatusCodeLib
+  UefiDriverEntryPoint
+  UefiBootServicesTableLib
+  UefiLib
+
+[Protocols]
+  gEfiDriverBindingProtocolGuid
+  gEfiSimpleTextInProtocolGuid
+  gEfiSimpleTextInputExProtocolGuid
+  gPlatformVirtualKeyboardProtocolGuid
+
+[Depex]
+  TRUE
diff --git a/EmbeddedPkg/Drivers/VirtualKeyboardDxe/ComponentName.h b/EmbeddedPkg/Drivers/VirtualKeyboardDxe/ComponentName.h
new file mode 100644
index 000000000000..94bef285086a
--- /dev/null
+++ b/EmbeddedPkg/Drivers/VirtualKeyboardDxe/ComponentName.h
@@ -0,0 +1,154 @@ 
+/** @file
+
+Copyright (c) 2006 - 2011, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2018, Linaro Ltd. All rights reserved.<BR>
+
+This program and the accompanying materials
+are licensed and made available under the terms and conditions
+of the BSD License which accompanies this distribution.  The
+full text of the license may be found at
+http://opensource.org/licenses/bsd-license.php
+
+THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#ifndef _VIRTUAL_KEYBOARD_COMPONENT_NAME_H_
+#define _VIRTUAL_KEYBOARD_COMPONENT_NAME_H_
+
+
+extern EFI_COMPONENT_NAME_PROTOCOL   gVirtualKeyboardComponentName;
+extern EFI_COMPONENT_NAME2_PROTOCOL  gVirtualKeyboardComponentName2;
+
+//
+// EFI Component Name Functions
+//
+/**
+  Retrieves a Unicode string that is the user readable name of the driver.
+
+  This function retrieves the user readable name of a driver in the form of a
+  Unicode string. If the driver specified by This has a user readable name in
+  the language specified by Language, then a pointer to the driver name is
+  returned in DriverName, and EFI_SUCCESS is returned. If the driver specified
+  by This does not support the language specified by Language,
+  then EFI_UNSUPPORTED is returned.
+
+  @param  This[in]              A pointer to the EFI_COMPONENT_NAME2_PROTOCOL or
+                                EFI_COMPONENT_NAME_PROTOCOL instance.
+
+  @param  Language[in]          A pointer to a Null-terminated ASCII string
+                                array indicating the language. This is the
+                                language of the driver name that the caller is
+                                requesting, and it must match one of the
+                                languages specified in SupportedLanguages. The
+                                number of languages supported by a driver is up
+                                to the driver writer. Language is specified
+                                in RFC 4646 or ISO 639-2 language code format.
+
+  @param  DriverName[out]       A pointer to the Unicode string to return.
+                                This Unicode string is the name of the
+                                driver specified by This in the language
+                                specified by Language.
+
+  @retval EFI_SUCCESS           The Unicode string for the Driver specified by
+                                This and the language specified by Language was
+                                returned in DriverName.
+
+  @retval EFI_INVALID_PARAMETER Language is NULL.
+
+  @retval EFI_INVALID_PARAMETER DriverName is NULL.
+
+  @retval EFI_UNSUPPORTED       The driver specified by This does not support
+                                the language specified by Language.
+
+**/
+EFI_STATUS
+EFIAPI
+VirtualKeyboardComponentNameGetDriverName (
+  IN  EFI_COMPONENT_NAME_PROTOCOL  *This,
+  IN  CHAR8                        *Language,
+  OUT CHAR16                       **DriverName
+  );
+
+
+/**
+  Retrieves a Unicode string that is the user readable name of the controller
+  that is being managed by a driver.
+
+  This function retrieves the user readable name of the controller specified by
+  ControllerHandle and ChildHandle in the form of a Unicode string. If the
+  driver specified by This has a user readable name in the language specified by
+  Language, then a pointer to the controller name is returned in ControllerName,
+  and EFI_SUCCESS is returned.  If the driver specified by This is not currently
+  managing the controller specified by ControllerHandle and ChildHandle,
+  then EFI_UNSUPPORTED is returned.  If the driver specified by This does not
+  support the language specified by Language, then EFI_UNSUPPORTED is returned.
+
+  @param  This[in]              A pointer to the EFI_COMPONENT_NAME2_PROTOCOL or
+                                EFI_COMPONENT_NAME_PROTOCOL instance.
+
+  @param  ControllerHandle[in]  The handle of a controller that the driver
+                                specified by This is managing.  This handle
+                                specifies the controller whose name is to be
+                                returned.
+
+  @param  ChildHandle[in]       The handle of the child controller to retrieve
+                                the name of.  This is an optional parameter that
+                                may be NULL.  It will be NULL for device
+                                drivers.  It will also be NULL for a bus drivers
+                                that wish to retrieve the name of the bus
+                                controller.  It will not be NULL for a bus
+                                driver that wishes to retrieve the name of a
+                                child controller.
+
+  @param  Language[in]          A pointer to a Null-terminated ASCII string
+                                array indicating the language.  This is the
+                                language of the driver name that the caller is
+                                requesting, and it must match one of the
+                                languages specified in SupportedLanguages. The
+                                number of languages supported by a driver is up
+                                to the driver writer. Language is specified in
+                                RFC 4646 or ISO 639-2 language code format.
+
+  @param  ControllerName[out]   A pointer to the Unicode string to return.
+                                This Unicode string is the name of the
+                                controller specified by ControllerHandle and
+                                ChildHandle in the language specified by
+                                Language from the point of view of the driver
+                                specified by This.
+
+  @retval EFI_SUCCESS           The Unicode string for the user readable name in
+                                the language specified by Language for the
+                                driver specified by This was returned in
+                                DriverName.
+
+  @retval EFI_INVALID_PARAMETER ControllerHandle is NULL.
+
+  @retval EFI_INVALID_PARAMETER ChildHandle is not NULL and it is not a valid
+                                EFI_HANDLE.
+
+  @retval EFI_INVALID_PARAMETER Language is NULL.
+
+  @retval EFI_INVALID_PARAMETER ControllerName is NULL.
+
+  @retval EFI_UNSUPPORTED       The driver specified by This is not currently
+                                managing the controller specified by
+                                ControllerHandle and ChildHandle.
+
+  @retval EFI_UNSUPPORTED       The driver specified by This does not support
+                                the language specified by Language.
+
+**/
+EFI_STATUS
+EFIAPI
+VirtualKeyboardComponentNameGetControllerName (
+  IN  EFI_COMPONENT_NAME_PROTOCOL                     *This,
+  IN  EFI_HANDLE                                      ControllerHandle,
+  IN  EFI_HANDLE                                      ChildHandle        OPTIONAL,
+  IN  CHAR8                                           *Language,
+  OUT CHAR16                                          **ControllerName
+  );
+
+
+#endif
diff --git a/EmbeddedPkg/Drivers/VirtualKeyboardDxe/VirtualKeyboard.h b/EmbeddedPkg/Drivers/VirtualKeyboardDxe/VirtualKeyboard.h
new file mode 100644
index 000000000000..6dc8264521a6
--- /dev/null
+++ b/EmbeddedPkg/Drivers/VirtualKeyboardDxe/VirtualKeyboard.h
@@ -0,0 +1,544 @@ 
+/** @file
+
+Copyright (c) 2006 - 2016, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2018, Linaro Ltd. All rights reserved.<BR>
+
+This program and the accompanying materials
+are licensed and made available under the terms and conditions
+of the BSD License which accompanies this distribution.  The
+full text of the license may be found at
+http://opensource.org/licenses/bsd-license.php
+
+THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#ifndef _VIRTUAL_KEYBOARD_H_
+#define _VIRTUAL_KEYBOARD_H_
+
+
+#include <Guid/StatusCodeDataTypeId.h>
+#include <Protocol/DevicePath.h>
+#include <Protocol/PlatformVirtualKeyboard.h>
+#include <Protocol/SimpleTextIn.h>
+#include <Protocol/SimpleTextInEx.h>
+
+#include <Library/BaseLib.h>
+#include <Library/BaseMemoryLib.h>
+#include <Library/DebugLib.h>
+#include <Library/MemoryAllocationLib.h>
+#include <Library/IoLib.h>
+#include <Library/PcdLib.h>
+#include <Library/ReportStatusCodeLib.h>
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/UefiDriverEntryPoint.h>
+#include <Library/UefiLib.h>
+
+//
+// Driver Binding Externs
+//
+extern EFI_DRIVER_BINDING_PROTOCOL  gVirtualKeyboardDriverBinding;
+extern EFI_COMPONENT_NAME_PROTOCOL  gVirtualKeyboardComponentName;
+extern EFI_COMPONENT_NAME2_PROTOCOL gVirtualKeyboardComponentName2;
+
+
+//
+// VIRTUAL Keyboard Defines
+//
+#define CHAR_SCANCODE                        0xe0
+#define CHAR_ESC                             0x1b
+
+#define KEYBOARD_TIMEOUT                     65536   // 0.07s
+#define KEYBOARD_WAITFORVALUE_TIMEOUT        1000000 // 1s
+#define KEYBOARD_BAT_TIMEOUT                 4000000 // 4s
+#define KEYBOARD_TIMER_INTERVAL              500000  // 0.5s
+
+#define QUEUE_MAX_COUNT                      32
+
+#define KEYBOARD_SCAN_CODE_MAX_COUNT         32
+
+//
+// VIRTUAL Keyboard Device Structure
+//
+#define VIRTUAL_KEYBOARD_DEV_SIGNATURE SIGNATURE_32 ('V', 'K', 'B', 'D')
+#define VIRTUAL_KEYBOARD_CONSOLE_IN_EX_NOTIFY_SIGNATURE SIGNATURE_32 ('v', 'k', 'c', 'n')
+
+typedef struct _VIRTUAL_KEYBOARD_CONSOLE_IN_EX_NOTIFY {
+  UINTN                                      Signature;
+  EFI_KEY_DATA                               KeyData;
+  EFI_KEY_NOTIFY_FUNCTION                    KeyNotificationFn;
+  LIST_ENTRY                                 NotifyEntry;
+} VIRTUAL_KEYBOARD_CONSOLE_IN_EX_NOTIFY;
+
+typedef struct {
+  UINTN                                      Front;
+  UINTN                                      Rear;
+  EFI_KEY_DATA                               Buffer[QUEUE_MAX_COUNT];
+} SIMPLE_QUEUE;
+
+typedef struct {
+  UINT8                                      Buffer[KEYBOARD_SCAN_CODE_MAX_COUNT];
+  UINTN                                      Head;
+  UINTN                                      Tail;
+} SCAN_CODE_QUEUE;
+
+typedef struct {
+  UINTN                                      Signature;
+  EFI_HANDLE                                 Handle;
+  PLATFORM_VIRTUAL_KBD_PROTOCOL              *PlatformVirtual;
+  EFI_SIMPLE_TEXT_INPUT_PROTOCOL             SimpleTextIn;
+  EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL          SimpleTextInputEx;
+
+  //
+  // Buffer storing EFI_KEY_DATA
+  //
+  SIMPLE_QUEUE                               Queue;
+  SIMPLE_QUEUE                               QueueForNotify;
+
+  //
+  // Notification Function List
+  //
+  LIST_ENTRY                                 NotifyList;
+  EFI_EVENT                                  KeyNotifyProcessEvent;
+  EFI_EVENT                                  TimerEvent;
+} VIRTUAL_KEYBOARD_DEV;
+
+#define VIRTUAL_KEYBOARD_DEV_FROM_THIS(a)  CR (a, VIRTUAL_KEYBOARD_DEV, SimpleTextIn, VIRTUAL_KEYBOARD_DEV_SIGNATURE)
+#define TEXT_INPUT_EX_VIRTUAL_KEYBOARD_DEV_FROM_THIS(a) \
+  CR (a, \
+      VIRTUAL_KEYBOARD_DEV, \
+      SimpleTextInputEx, \
+      VIRTUAL_KEYBOARD_DEV_SIGNATURE \
+      )
+
+//
+// Global Variables
+//
+extern EFI_DRIVER_BINDING_PROTOCOL   gVirtualKeyboardDriverBinding;
+
+//
+// Driver Binding Protocol functions
+//
+
+/**
+  Check whether the driver supports this device.
+
+  @param  This                   The Udriver binding protocol.
+  @param  Controller             The controller handle to check.
+  @param  RemainingDevicePath    The remaining device path.
+
+  @retval EFI_SUCCESS            The driver supports this controller.
+  @retval other                  This device isn't supported.
+
+**/
+EFI_STATUS
+EFIAPI
+VirtualKeyboardDriverBindingSupported (
+  IN EFI_DRIVER_BINDING_PROTOCOL  *This,
+  IN EFI_HANDLE                   Controller,
+  IN EFI_DEVICE_PATH_PROTOCOL     *RemainingDevicePath
+  );
+
+/**
+  Starts the device with this driver.
+
+  @param  This                   The driver binding instance.
+  @param  Controller             Handle of device to bind driver to.
+  @param  RemainingDevicePath    Optional parameter use to pick a specific child
+                                 device to start.
+
+  @retval EFI_SUCCESS            The controller is controlled by the driver.
+  @retval Other                  This controller cannot be started.
+
+**/
+EFI_STATUS
+EFIAPI
+VirtualKeyboardDriverBindingStart (
+  IN EFI_DRIVER_BINDING_PROTOCOL  *This,
+  IN EFI_HANDLE                   Controller,
+  IN EFI_DEVICE_PATH_PROTOCOL     *RemainingDevicePath
+  );
+
+/**
+  Stop the device handled by this driver.
+
+  @param  This                   The driver binding protocol.
+  @param  Controller             The controller to release.
+  @param  NumberOfChildren       The number of handles in ChildHandleBuffer.
+  @param  ChildHandleBuffer      The array of child handle.
+
+  @retval EFI_SUCCESS            The device was stopped.
+  @retval EFI_DEVICE_ERROR       The device could not be stopped due to a device error.
+  @retval Others                 Fail to uninstall protocols attached on the device.
+
+**/
+EFI_STATUS
+EFIAPI
+VirtualKeyboardDriverBindingStop (
+  IN  EFI_DRIVER_BINDING_PROTOCOL  *This,
+  IN  EFI_HANDLE                   Controller,
+  IN  UINTN                        NumberOfChildren,
+  IN  EFI_HANDLE                   *ChildHandleBuffer
+  );
+
+/**
+  Retrieves a Unicode string that is the user readable name of the driver.
+
+  This function retrieves the user readable name of a driver in the form of a
+  Unicode string. If the driver specified by This has a user readable name in
+  the language specified by Language, then a pointer to the driver name is
+  returned in DriverName, and EFI_SUCCESS is returned. If the driver specified
+  by This does not support the language specified by Language,
+  then EFI_UNSUPPORTED is returned.
+
+  @param  This[in]              A pointer to the EFI_COMPONENT_NAME2_PROTOCOL or
+                                EFI_COMPONENT_NAME_PROTOCOL instance.
+
+  @param  Language[in]          A pointer to a Null-terminated ASCII string
+                                array indicating the language. This is the
+                                language of the driver name that the caller is
+                                requesting, and it must match one of the
+                                languages specified in SupportedLanguages. The
+                                number of languages supported by a driver is up
+                                to the driver writer. Language is specified
+                                in RFC 4646 or ISO 639-2 language code format.
+
+  @param  DriverName[out]       A pointer to the Unicode string to return.
+                                This Unicode string is the name of the
+                                driver specified by This in the language
+                                specified by Language.
+
+  @retval EFI_SUCCESS           The Unicode string for the Driver specified by
+                                This and the language specified by Language was
+                                returned in DriverName.
+
+  @retval EFI_INVALID_PAVIRTUALETER Language is NULL.
+
+  @retval EFI_INVALID_PAVIRTUALETER DriverName is NULL.
+
+  @retval EFI_UNSUPPORTED       The driver specified by This does not support
+                                the language specified by Language.
+
+**/
+EFI_STATUS
+EFIAPI
+VirtualKeyboardComponentNameGetDriverName (
+  IN  EFI_COMPONENT_NAME_PROTOCOL  *This,
+  IN  CHAR8                        *Language,
+  OUT CHAR16                       **DriverName
+  );
+
+
+/**
+  Retrieves a Unicode string that is the user readable name of the controller
+  that is being managed by a driver.
+
+  This function retrieves the user readable name of the controller specified by
+  ControllerHandle and ChildHandle in the form of a Unicode string. If the
+  driver specified by This has a user readable name in the language specified by
+  Language, then a pointer to the controller name is returned in ControllerName,
+  and EFI_SUCCESS is returned.  If the driver specified by This is not currently
+  managing the controller specified by ControllerHandle and ChildHandle,
+  then EFI_UNSUPPORTED is returned.  If the driver specified by This does not
+  support the language specified by Language, then EFI_UNSUPPORTED is returned.
+
+  @param  This[in]              A pointer to the EFI_COMPONENT_NAME2_PROTOCOL or
+                                EFI_COMPONENT_NAME_PROTOCOL instance.
+
+  @param  ControllerHandle[in]  The handle of a controller that the driver
+                                specified by This is managing.  This handle
+                                specifies the controller whose name is to be
+                                returned.
+
+  @param  ChildHandle[in]       The handle of the child controller to retrieve
+                                the name of.  This is an optional parameter that
+                                may be NULL.  It will be NULL for device
+                                drivers.  It will also be NULL for a bus drivers
+                                that wish to retrieve the name of the bus
+                                controller.  It will not be NULL for a bus
+                                driver that wishes to retrieve the name of a
+                                child controller.
+
+  @param  Language[in]          A pointer to a Null-terminated ASCII string
+                                array indicating the language.  This is the
+                                language of the driver name that the caller is
+                                requesting, and it must match one of the
+                                languages specified in SupportedLanguages. The
+                                number of languages supported by a driver is up
+                                to the driver writer. Language is specified in
+                                RFC 4646 or ISO 639-2 language code format.
+
+  @param  ControllerName[out]   A pointer to the Unicode string to return.
+                                This Unicode string is the name of the
+                                controller specified by ControllerHandle and
+                                ChildHandle in the language specified by
+                                Language from the point of view of the driver
+                                specified by This.
+
+  @retval EFI_SUCCESS           The Unicode string for the user readable name in
+                                the language specified by Language for the
+                                driver specified by This was returned in
+                                DriverName.
+
+  @retval EFI_INVALID_PAVIRTUALETER ControllerHandle is NULL.
+
+  @retval EFI_INVALID_PAVIRTUALETER ChildHandle is not NULL and it is not a valid
+                                EFI_HANDLE.
+
+  @retval EFI_INVALID_PAVIRTUALETER Language is NULL.
+
+  @retval EFI_INVALID_PAVIRTUALETER ControllerName is NULL.
+
+  @retval EFI_UNSUPPORTED       The driver specified by This is not currently
+                                managing the controller specified by
+                                ControllerHandle and ChildHandle.
+
+  @retval EFI_UNSUPPORTED       The driver specified by This does not support
+                                the language specified by Language.
+
+**/
+EFI_STATUS
+EFIAPI
+VirtualKeyboardComponentNameGetControllerName (
+  IN  EFI_COMPONENT_NAME_PROTOCOL      *This,
+  IN  EFI_HANDLE                       ControllerHandle,
+  IN  EFI_HANDLE                       ChildHandle        OPTIONAL,
+  IN  CHAR8                            *Language,
+  OUT CHAR16                           **ControllerName
+  );
+
+
+//
+// Simple Text Input Protocol functions
+//
+/**
+  Reset the Keyboard and do BAT test for it, if (ExtendedVerification == TRUE) then do some extra keyboard validations.
+
+  @param  This                  Pointer of simple text Protocol.
+  @param  ExtendedVerification  Whether perform the extra validation of keyboard. True: perform; FALSE: skip.
+
+  @retval EFI_SUCCESS           The command byte is written successfully.
+  @retval EFI_DEVICE_ERROR      Errors occurred during resetting keyboard.
+
+**/
+EFI_STATUS
+EFIAPI
+VirtualKeyboardReset (
+  IN  EFI_SIMPLE_TEXT_INPUT_PROTOCOL  *This,
+  IN  BOOLEAN                         ExtendedVerification
+  );
+
+/**
+  Reset the input device and optionaly run diagnostics
+
+  @param  This                  Protocol instance pointer.
+  @param  ExtendedVerification  Driver may perform diagnostics on reset.
+
+  @retval EFI_SUCCESS           The device was reset.
+  @retval EFI_DEVICE_ERROR      The device is not functioning properly and could
+                                not be reset.
+
+**/
+EFI_STATUS
+EFIAPI
+VirtualKeyboardResetEx (
+  IN EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL  *This,
+  IN BOOLEAN                            ExtendedVerification
+  );
+
+/**
+  Set certain state for the input device.
+
+  @param  This              Protocol instance pointer.
+  @param  KeyToggleState    A pointer to the EFI_KEY_TOGGLE_STATE to set the
+                            state for the input device.
+
+  @retval EFI_SUCCESS           The device state was set successfully.
+  @retval EFI_DEVICE_ERROR      The device is not functioning correctly and could
+                                not have the setting adjusted.
+  @retval EFI_UNSUPPORTED       The device does not have the ability to set its state.
+  @retval EFI_INVALID_PAVIRTUALETER KeyToggleState is NULL.
+
+**/
+EFI_STATUS
+EFIAPI
+VirtualKeyboardSetState (
+  IN EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL  *This,
+  IN EFI_KEY_TOGGLE_STATE               *KeyToggleState
+  );
+
+/**
+  Register a notification function for a particular keystroke for the input device.
+
+  @param  This                    Protocol instance pointer.
+  @param  KeyData                 A pointer to a buffer that is filled in with the keystroke
+                                  information data for the key that was pressed.
+  @param  KeyNotificationFunction Points to the function to be called when the key
+                                  sequence is typed specified by KeyData.
+  @param  NotifyHandle            Points to the unique handle assigned to the registered notification.
+
+
+  @retval EFI_SUCCESS             The notification function was registered successfully.
+  @retval EFI_OUT_OF_RESOURCES    Unable to allocate resources for necesssary data structures.
+  @retval EFI_INVALID_PAVIRTUALETER   KeyData or NotifyHandle is NULL.
+
+**/
+EFI_STATUS
+EFIAPI
+VirtualKeyboardRegisterKeyNotify (
+  IN EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL  *This,
+  IN EFI_KEY_DATA                       *KeyData,
+  IN EFI_KEY_NOTIFY_FUNCTION            KeyNotificationFunction,
+  OUT VOID                              **NotifyHandle
+  );
+
+/**
+  Remove a registered notification function from a particular keystroke.
+
+  @param  This                 Protocol instance pointer.
+  @param  NotificationHandle   The handle of the notification function being unregistered.
+
+  @retval EFI_SUCCESS             The notification function was unregistered successfully.
+  @retval EFI_INVALID_PAVIRTUALETER   The NotificationHandle is invalid.
+
+**/
+EFI_STATUS
+EFIAPI
+VirtualKeyboardUnregisterKeyNotify (
+  IN EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL  *This,
+  IN VOID                               *NotificationHandle
+  );
+
+//
+// Private worker functions
+//
+/**
+  Free keyboard notify list.
+
+  @param  ListHead   The list head
+
+  @retval EFI_SUCCESS           Free the notify list successfully
+  @retval EFI_INVALID_PAVIRTUALETER ListHead is invalid.
+
+**/
+EFI_STATUS
+VirtualKeyboardFreeNotifyList (
+  IN OUT LIST_ENTRY           *ListHead
+  );
+
+/**
+  Check if key is registered.
+
+  @param  RegsiteredData    A pointer to a buffer that is filled in with the keystroke
+                            state data for the key that was registered.
+  @param  InputData         A pointer to a buffer that is filled in with the keystroke
+                            state data for the key that was pressed.
+
+  @retval TRUE              Key be pressed matches a registered key.
+  @retval FLASE             Match failed.
+
+**/
+BOOLEAN
+IsKeyRegistered (
+  IN EFI_KEY_DATA  *RegsiteredData,
+  IN EFI_KEY_DATA  *InputData
+  );
+
+/**
+  Waiting on the keyboard event, if there's any key pressed by the user, signal the event
+
+  @param  Event       The event that be siganlled when any key has been stroked.
+  @param  Context     Pointer of the protocol EFI_SIMPLE_TEXT_INPUT_PROTOCOL.
+
+**/
+VOID
+EFIAPI
+VirtualKeyboardWaitForKey (
+  IN  EFI_EVENT  Event,
+  IN  VOID       *Context
+  );
+
+/**
+  Waiting on the keyboard event, if there's any key pressed by the user, signal the event
+
+  @param  Event    The event that be siganlled when any key has been stroked.
+  @param  Context  Pointer of the protocol EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL.
+
+**/
+VOID
+EFIAPI
+VirtualKeyboardWaitForKeyEx (
+  IN  EFI_EVENT  Event,
+  IN  VOID       *Context
+  );
+
+/**
+  Timer event handler: read a series of key stroke from 8042
+  and put them into memory key buffer.
+  It is registered as running under TPL_NOTIFY
+
+  @param  Event   The timer event
+  @param  Context A VIRTUAL_KEYBOARD_DEV pointer
+
+**/
+VOID
+EFIAPI
+VirtualKeyboardTimerHandler (
+  IN EFI_EVENT    Event,
+  IN VOID         *Context
+  );
+
+/**
+  Process key notify.
+
+  @param  Event                 Indicates the event that invoke this function.
+  @param  Context               Indicates the calling context.
+**/
+VOID
+EFIAPI
+KeyNotifyProcessHandler (
+  IN  EFI_EVENT                 Event,
+  IN  VOID                      *Context
+  );
+
+/**
+  Read out the scan code of the key that has just been stroked.
+
+  @param  This        Pointer of simple text Protocol.
+  @param  Key         Pointer for store the key that read out.
+
+  @retval EFI_SUCCESS The key is read out successfully.
+  @retval other       The key reading failed.
+
+**/
+EFI_STATUS
+EFIAPI
+VirtualKeyboardReadKeyStroke (
+  IN  EFI_SIMPLE_TEXT_INPUT_PROTOCOL  *This,
+  OUT EFI_INPUT_KEY                   *Key
+  );
+
+/**
+  Reads the next keystroke from the input device. The WaitForKey Event can
+  be used to test for existance of a keystroke via WaitForEvent () call.
+
+  @param  This         Protocol instance pointer.
+  @param  KeyData      A pointer to a buffer that is filled in with the keystroke
+                       state data for the key that was pressed.
+
+  @retval  EFI_SUCCESS           The keystroke information was returned.
+  @retval  EFI_NOT_READY         There was no keystroke data availiable.
+  @retval  EFI_DEVICE_ERROR      The keystroke information was not returned due to
+                                 hardware errors.
+  @retval  EFI_INVALID_PAVIRTUALETER KeyData is NULL.
+
+**/
+EFI_STATUS
+EFIAPI
+VirtualKeyboardReadKeyStrokeEx (
+  IN  EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL *This,
+  OUT EFI_KEY_DATA                      *KeyData
+  );
+
+#endif /* _VIRTUAL_KEYBOARD_H_ */
diff --git a/EmbeddedPkg/Include/Protocol/PlatformVirtualKeyboard.h b/EmbeddedPkg/Include/Protocol/PlatformVirtualKeyboard.h
new file mode 100644
index 000000000000..c64d21e45c08
--- /dev/null
+++ b/EmbeddedPkg/Include/Protocol/PlatformVirtualKeyboard.h
@@ -0,0 +1,65 @@ 
+/** @file
+
+  Copyright (c) 2018, Linaro. All rights reserved.
+
+  This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD License
+  which accompanies this distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#ifndef __PLATFORM_VIRTUAL_KEYBOARD_H__
+#define __PLATFORM_VIRTUAL_KEYBOARD_H__
+
+//
+// Protocol interface structure
+//
+typedef struct _PLATFORM_VIRTUAL_KBD_PROTOCOL  PLATFORM_VIRTUAL_KBD_PROTOCOL;
+
+typedef struct _VIRTUAL_KBD_KEY                VIRTUAL_KBD_KEY;
+
+#define VIRTUAL_KEYBOARD_KEY_SIGNATURE         SIGNATURE_32 ('v', 'k', 'b', 'd')
+
+struct _VIRTUAL_KBD_KEY {
+  UINTN                    Signature;
+  EFI_INPUT_KEY            Key;
+};
+
+typedef
+EFI_STATUS
+(EFIAPI *PLATFORM_VIRTUAL_KBD_REGISTER) (
+  IN VOID
+  );
+
+typedef
+EFI_STATUS
+(EFIAPI *PLATFORM_VIRTUAL_KBD_RESET) (
+  IN VOID
+  );
+
+typedef
+BOOLEAN
+(EFIAPI *PLATFORM_VIRTUAL_KBD_QUERY) (
+  IN VIRTUAL_KBD_KEY                           *VirtualKey
+  );
+
+typedef
+EFI_STATUS
+(EFIAPI *PLATFORM_VIRTUAL_KBD_CLEAR) (
+  IN VIRTUAL_KBD_KEY                           *VirtualKey
+  );
+
+struct _PLATFORM_VIRTUAL_KBD_PROTOCOL {
+  PLATFORM_VIRTUAL_KBD_REGISTER                Register;
+  PLATFORM_VIRTUAL_KBD_RESET                   Reset;
+  PLATFORM_VIRTUAL_KBD_QUERY                   Query;
+  PLATFORM_VIRTUAL_KBD_CLEAR                   Clear;
+};
+
+extern EFI_GUID gPlatformVirtualKeyboardProtocolGuid;
+
+#endif /* __PLATFORM_VIRTUAL_KEYBOARD_H__ */
diff --git a/EmbeddedPkg/Drivers/VirtualKeyboardDxe/ComponentName.c b/EmbeddedPkg/Drivers/VirtualKeyboardDxe/ComponentName.c
new file mode 100644
index 000000000000..9ba706c37b8d
--- /dev/null
+++ b/EmbeddedPkg/Drivers/VirtualKeyboardDxe/ComponentName.c
@@ -0,0 +1,188 @@ 
+/** @file
+
+Copyright (c) 2006 - 2011, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2018, Linaro Ltd. All rights reserved.<BR>
+
+This program and the accompanying materials
+are licensed and made available under the terms and conditions
+of the BSD License which accompanies this distribution.  The
+full text of the license may be found at
+http://opensource.org/licenses/bsd-license.php
+
+THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#include "VirtualKeyboard.h"
+
+//
+// EFI Component Name Protocol
+//
+GLOBAL_REMOVE_IF_UNREFERENCED EFI_COMPONENT_NAME_PROTOCOL  gVirtualKeyboardComponentName = {
+  VirtualKeyboardComponentNameGetDriverName,
+  VirtualKeyboardComponentNameGetControllerName,
+  "eng"
+};
+
+//
+// EFI Component Name 2 Protocol
+//
+GLOBAL_REMOVE_IF_UNREFERENCED EFI_COMPONENT_NAME2_PROTOCOL gVirtualKeyboardComponentName2 = {
+  (EFI_COMPONENT_NAME2_GET_DRIVER_NAME) VirtualKeyboardComponentNameGetDriverName,
+  (EFI_COMPONENT_NAME2_GET_CONTROLLER_NAME) VirtualKeyboardComponentNameGetControllerName,
+  "en"
+};
+
+
+GLOBAL_REMOVE_IF_UNREFERENCED EFI_UNICODE_STRING_TABLE mVirtualKeyboardDriverNameTable[] = {
+  {
+    "eng;en",
+    L"Virtual Keyboard Driver"
+  },
+  {
+    "zh-CHS",
+    L"虚拟键盘驱动程序"
+  },
+  {
+    NULL,
+    NULL
+  }
+};
+
+/**
+  Retrieves a Unicode string that is the user readable name of the driver.
+
+  This function retrieves the user readable name of a driver in the form of a
+  Unicode string. If the driver specified by This has a user readable name in
+  the language specified by Language, then a pointer to the driver name is
+  returned in DriverName, and EFI_SUCCESS is returned. If the driver specified
+  by This does not support the language specified by Language,
+  then EFI_UNSUPPORTED is returned.
+
+  @param  This[in]              A pointer to the EFI_COMPONENT_NAME2_PROTOCOL or
+                                EFI_COMPONENT_NAME_PROTOCOL instance.
+
+  @param  Language[in]          A pointer to a Null-terminated ASCII string
+                                array indicating the language. This is the
+                                language of the driver name that the caller is
+                                requesting, and it must match one of the
+                                languages specified in SupportedLanguages. The
+                                number of languages supported by a driver is up
+                                to the driver writer. Language is specified
+                                in RFC 4646 or ISO 639-2 language code format.
+
+  @param  DriverName[out]       A pointer to the Unicode string to return.
+                                This Unicode string is the name of the
+                                driver specified by This in the language
+                                specified by Language.
+
+  @retval EFI_SUCCESS           The Unicode string for the Driver specified by
+                                This and the language specified by Language was
+                                returned in DriverName.
+
+  @retval EFI_INVALID_PARAMETER Language is NULL.
+
+  @retval EFI_INVALID_PARAMETER DriverName is NULL.
+
+  @retval EFI_UNSUPPORTED       The driver specified by This does not support
+                                the language specified by Language.
+
+**/
+EFI_STATUS
+EFIAPI
+VirtualKeyboardComponentNameGetDriverName (
+  IN  EFI_COMPONENT_NAME_PROTOCOL  *This,
+  IN  CHAR8                        *Language,
+  OUT CHAR16                       **DriverName
+  )
+{
+  return LookupUnicodeString2 (
+           Language,
+           This->SupportedLanguages,
+           mVirtualKeyboardDriverNameTable,
+           DriverName,
+           (BOOLEAN)(This == &gVirtualKeyboardComponentName)
+           );
+}
+
+/**
+  Retrieves a Unicode string that is the user readable name of the controller
+  that is being managed by a driver.
+
+  This function retrieves the user readable name of the controller specified by
+  ControllerHandle and ChildHandle in the form of a Unicode string. If the
+  driver specified by This has a user readable name in the language specified by
+  Language, then a pointer to the controller name is returned in ControllerName,
+  and EFI_SUCCESS is returned.  If the driver specified by This is not currently
+  managing the controller specified by ControllerHandle and ChildHandle,
+  then EFI_UNSUPPORTED is returned.  If the driver specified by This does not
+  support the language specified by Language, then EFI_UNSUPPORTED is returned.
+
+  @param  This[in]              A pointer to the EFI_COMPONENT_NAME2_PROTOCOL or
+                                EFI_COMPONENT_NAME_PROTOCOL instance.
+
+  @param  ControllerHandle[in]  The handle of a controller that the driver
+                                specified by This is managing.  This handle
+                                specifies the controller whose name is to be
+                                returned.
+
+  @param  ChildHandle[in]       The handle of the child controller to retrieve
+                                the name of.  This is an optional parameter that
+                                may be NULL.  It will be NULL for device
+                                drivers.  It will also be NULL for a bus drivers
+                                that wish to retrieve the name of the bus
+                                controller.  It will not be NULL for a bus
+                                driver that wishes to retrieve the name of a
+                                child controller.
+
+  @param  Language[in]          A pointer to a Null-terminated ASCII string
+                                array indicating the language.  This is the
+                                language of the driver name that the caller is
+                                requesting, and it must match one of the
+                                languages specified in SupportedLanguages. The
+                                number of languages supported by a driver is up
+                                to the driver writer. Language is specified in
+                                RFC 4646 or ISO 639-2 language code format.
+
+  @param  ControllerName[out]   A pointer to the Unicode string to return.
+                                This Unicode string is the name of the
+                                controller specified by ControllerHandle and
+                                ChildHandle in the language specified by
+                                Language from the point of view of the driver
+                                specified by This.
+
+  @retval EFI_SUCCESS           The Unicode string for the user readable name in
+                                the language specified by Language for the
+                                driver specified by This was returned in
+                                DriverName.
+
+  @retval EFI_INVALID_PARAMETER ControllerHandle is NULL.
+
+  @retval EFI_INVALID_PARAMETER ChildHandle is not NULL and it is not a valid
+                                EFI_HANDLE.
+
+  @retval EFI_INVALID_PARAMETER Language is NULL.
+
+  @retval EFI_INVALID_PARAMETER ControllerName is NULL.
+
+  @retval EFI_UNSUPPORTED       The driver specified by This is not currently
+                                managing the controller specified by
+                                ControllerHandle and ChildHandle.
+
+  @retval EFI_UNSUPPORTED       The driver specified by This does not support
+                                the language specified by Language.
+
+**/
+EFI_STATUS
+EFIAPI
+VirtualKeyboardComponentNameGetControllerName (
+  IN  EFI_COMPONENT_NAME_PROTOCOL                     *This,
+  IN  EFI_HANDLE                                      ControllerHandle,
+  IN  EFI_HANDLE                                      ChildHandle        OPTIONAL,
+  IN  CHAR8                                           *Language,
+  OUT CHAR16                                          **ControllerName
+  )
+{
+  return EFI_UNSUPPORTED;
+}
diff --git a/EmbeddedPkg/Drivers/VirtualKeyboardDxe/VirtualKeyboard.c b/EmbeddedPkg/Drivers/VirtualKeyboardDxe/VirtualKeyboard.c
new file mode 100644
index 000000000000..6609bc8dbe9b
--- /dev/null
+++ b/EmbeddedPkg/Drivers/VirtualKeyboardDxe/VirtualKeyboard.c
@@ -0,0 +1,1149 @@ 
+/** @file
+  VirtualKeyboard driver
+
+Copyright (c) 2006 - 2016, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2018, Linaro Ltd. All rights reserved.<BR>
+
+This program and the accompanying materials
+are licensed and made available under the terms and conditions
+of the BSD License which accompanies this distribution.  The
+full text of the license may be found at
+http://opensource.org/licenses/bsd-license.php
+
+THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#include "VirtualKeyboard.h"
+
+//
+// RAM Keyboard Driver Binding Protocol Instance
+//
+EFI_DRIVER_BINDING_PROTOCOL gVirtualKeyboardDriverBinding = {
+  VirtualKeyboardDriverBindingSupported,
+  VirtualKeyboardDriverBindingStart,
+  VirtualKeyboardDriverBindingStop,
+  0x10,
+  NULL,
+  NULL
+};
+
+//
+// EFI Driver Binding Protocol Functions
+//
+
+/**
+  Check whether the driver supports this device.
+
+  @param  This                   The Udriver binding protocol.
+  @param  Controller             The controller handle to check.
+  @param  RemainingDevicePath    The remaining device path.
+
+  @retval EFI_SUCCESS            The driver supports this controller.
+  @retval other                  This device isn't supported.
+
+**/
+EFI_STATUS
+EFIAPI
+VirtualKeyboardDriverBindingSupported (
+  IN EFI_DRIVER_BINDING_PROTOCOL  *This,
+  IN EFI_HANDLE                   Controller,
+  IN EFI_DEVICE_PATH_PROTOCOL     *RemainingDevicePath
+  )
+{
+  EFI_STATUS                      Status;
+  PLATFORM_VIRTUAL_KBD_PROTOCOL   *PlatformVirtual;
+
+  Status = gBS->OpenProtocol (
+                  Controller,
+                  &gPlatformVirtualKeyboardProtocolGuid,
+                  (VOID **) &PlatformVirtual,
+                  This->DriverBindingHandle,
+                  Controller,
+                  EFI_OPEN_PROTOCOL_BY_DRIVER
+                  );
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+  gBS->CloseProtocol (
+         Controller,
+         &gPlatformVirtualKeyboardProtocolGuid,
+         This->DriverBindingHandle,
+         Controller
+         );
+  return Status;
+}
+
+/**
+  Starts the device with this driver.
+
+  @param  This                   The driver binding instance.
+  @param  Controller             Handle of device to bind driver to.
+  @param  RemainingDevicePath    Optional parameter use to pick a specific child
+                                 device to start.
+
+  @retval EFI_SUCCESS            The controller is controlled by the driver.
+  @retval Other                  This controller cannot be started.
+
+**/
+EFI_STATUS
+EFIAPI
+VirtualKeyboardDriverBindingStart (
+  IN EFI_DRIVER_BINDING_PROTOCOL  *This,
+  IN EFI_HANDLE                   Controller,
+  IN EFI_DEVICE_PATH_PROTOCOL     *RemainingDevicePath
+  )
+{
+  EFI_STATUS                                Status;
+  VIRTUAL_KEYBOARD_DEV                      *VirtualKeyboardPrivate;
+  PLATFORM_VIRTUAL_KBD_PROTOCOL             *PlatformVirtual;
+
+  Status = gBS->OpenProtocol (
+                  Controller,
+                  &gPlatformVirtualKeyboardProtocolGuid,
+                  (VOID **) &PlatformVirtual,
+                  This->DriverBindingHandle,
+                  Controller,
+                  EFI_OPEN_PROTOCOL_BY_DRIVER
+                  );
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  //
+  // Allocate the private device structure
+  //
+  VirtualKeyboardPrivate = (VIRTUAL_KEYBOARD_DEV *) AllocateZeroPool (sizeof (VIRTUAL_KEYBOARD_DEV));
+  if (VirtualKeyboardPrivate == NULL) {
+    Status = EFI_OUT_OF_RESOURCES;
+    goto Done;
+  }
+
+  //
+  // Initialize the private device structure
+  //
+  VirtualKeyboardPrivate->Signature                  = VIRTUAL_KEYBOARD_DEV_SIGNATURE;
+  VirtualKeyboardPrivate->Handle                     = Controller;
+  VirtualKeyboardPrivate->PlatformVirtual            = PlatformVirtual;
+  VirtualKeyboardPrivate->Queue.Front                = 0;
+  VirtualKeyboardPrivate->Queue.Rear                 = 0;
+  VirtualKeyboardPrivate->QueueForNotify.Front       = 0;
+  VirtualKeyboardPrivate->QueueForNotify.Rear        = 0;
+
+  VirtualKeyboardPrivate->SimpleTextIn.Reset         = VirtualKeyboardReset;
+  VirtualKeyboardPrivate->SimpleTextIn.ReadKeyStroke = VirtualKeyboardReadKeyStroke;
+
+  VirtualKeyboardPrivate->SimpleTextInputEx.Reset               = VirtualKeyboardResetEx;
+  VirtualKeyboardPrivate->SimpleTextInputEx.ReadKeyStrokeEx     = VirtualKeyboardReadKeyStrokeEx;
+  VirtualKeyboardPrivate->SimpleTextInputEx.SetState            = VirtualKeyboardSetState;
+
+  VirtualKeyboardPrivate->SimpleTextInputEx.RegisterKeyNotify   = VirtualKeyboardRegisterKeyNotify;
+  VirtualKeyboardPrivate->SimpleTextInputEx.UnregisterKeyNotify = VirtualKeyboardUnregisterKeyNotify;
+  InitializeListHead (&VirtualKeyboardPrivate->NotifyList);
+
+  Status = PlatformVirtual->Register ();
+  if (EFI_ERROR (Status)) {
+    goto Done;
+  }
+
+  //
+  // Report that the keyboard is being enabled
+  //
+  REPORT_STATUS_CODE (
+    EFI_PROGRESS_CODE,
+    EFI_PERIPHERAL_KEYBOARD | EFI_P_PC_ENABLE
+    );
+
+  //
+  // Setup the WaitForKey event
+  //
+  Status = gBS->CreateEvent (
+                  EVT_NOTIFY_WAIT,
+                  TPL_NOTIFY,
+                  VirtualKeyboardWaitForKey,
+                  &(VirtualKeyboardPrivate->SimpleTextIn),
+                  &((VirtualKeyboardPrivate->SimpleTextIn).WaitForKey)
+                  );
+  if (EFI_ERROR (Status)) {
+    (VirtualKeyboardPrivate->SimpleTextIn).WaitForKey = NULL;
+    goto Done;
+  }
+  Status = gBS->CreateEvent (
+                  EVT_NOTIFY_WAIT,
+                  TPL_NOTIFY,
+                  VirtualKeyboardWaitForKeyEx,
+                  &(VirtualKeyboardPrivate->SimpleTextInputEx),
+                  &(VirtualKeyboardPrivate->SimpleTextInputEx.WaitForKeyEx)
+                  );
+  if (EFI_ERROR (Status)) {
+    VirtualKeyboardPrivate->SimpleTextInputEx.WaitForKeyEx = NULL;
+    goto Done;
+  }
+
+  //
+  // Setup a periodic timer, used for reading keystrokes at a fixed interval
+  //
+  Status = gBS->CreateEvent (
+                  EVT_TIMER | EVT_NOTIFY_SIGNAL,
+                  TPL_NOTIFY,
+                  VirtualKeyboardTimerHandler,
+                  VirtualKeyboardPrivate,
+                  &VirtualKeyboardPrivate->TimerEvent
+                  );
+  if (EFI_ERROR (Status)) {
+    Status = EFI_OUT_OF_RESOURCES;
+    goto Done;
+  }
+
+  Status = gBS->SetTimer (
+                  VirtualKeyboardPrivate->TimerEvent,
+                  TimerPeriodic,
+                  KEYBOARD_TIMER_INTERVAL
+                  );
+  if (EFI_ERROR (Status)) {
+    Status = EFI_OUT_OF_RESOURCES;
+    goto Done;
+  }
+
+  Status = gBS->CreateEvent (
+                  EVT_NOTIFY_SIGNAL,
+                  TPL_CALLBACK,
+                  KeyNotifyProcessHandler,
+                  VirtualKeyboardPrivate,
+                  &VirtualKeyboardPrivate->KeyNotifyProcessEvent
+                  );
+  if (EFI_ERROR (Status)) {
+    Status = EFI_OUT_OF_RESOURCES;
+    goto Done;
+  }
+
+  //
+  // Reset the keyboard device
+  //
+  Status = VirtualKeyboardPrivate->SimpleTextInputEx.Reset (
+                                     &VirtualKeyboardPrivate->SimpleTextInputEx,
+                                     FALSE
+                                     );
+  if (EFI_ERROR (Status)) {
+    DEBUG ((DEBUG_ERROR, "[KBD]Reset Failed. Status - %r\n", Status));
+    goto Done;
+  }
+  //
+  // Install protocol interfaces for the keyboard device.
+  //
+  Status = gBS->InstallMultipleProtocolInterfaces (
+                  &Controller,
+                  &gEfiSimpleTextInProtocolGuid,
+                  &VirtualKeyboardPrivate->SimpleTextIn,
+                  &gEfiSimpleTextInputExProtocolGuid,
+                  &VirtualKeyboardPrivate->SimpleTextInputEx,
+                  NULL
+                  );
+
+Done:
+  if (EFI_ERROR (Status)) {
+    if (VirtualKeyboardPrivate != NULL) {
+      if ((VirtualKeyboardPrivate->SimpleTextIn).WaitForKey != NULL) {
+        gBS->CloseEvent ((VirtualKeyboardPrivate->SimpleTextIn).WaitForKey);
+      }
+
+      if ((VirtualKeyboardPrivate->SimpleTextInputEx).WaitForKeyEx != NULL) {
+        gBS->CloseEvent (
+               (VirtualKeyboardPrivate->SimpleTextInputEx).WaitForKeyEx
+               );
+      }
+
+      if (VirtualKeyboardPrivate->KeyNotifyProcessEvent != NULL) {
+        gBS->CloseEvent (VirtualKeyboardPrivate->KeyNotifyProcessEvent);
+      }
+
+      VirtualKeyboardFreeNotifyList (&VirtualKeyboardPrivate->NotifyList);
+
+      if (VirtualKeyboardPrivate->TimerEvent != NULL) {
+        gBS->CloseEvent (VirtualKeyboardPrivate->TimerEvent);
+      }
+      FreePool (VirtualKeyboardPrivate);
+    }
+  }
+
+  gBS->CloseProtocol (
+         Controller,
+         &gPlatformVirtualKeyboardProtocolGuid,
+         This->DriverBindingHandle,
+         Controller
+         );
+
+  return Status;
+}
+
+/**
+  Stop the device handled by this driver.
+
+  @param  This                   The driver binding protocol.
+  @param  Controller             The controller to release.
+  @param  NumberOfChildren       The number of handles in ChildHandleBuffer.
+  @param  ChildHandleBuffer      The array of child handle.
+
+  @retval EFI_SUCCESS            The device was stopped.
+  @retval EFI_DEVICE_ERROR       The device could not be stopped due to a
+                                 device error.
+  @retval Others                 Fail to uninstall protocols attached on the
+                                 device.
+
+**/
+EFI_STATUS
+EFIAPI
+VirtualKeyboardDriverBindingStop (
+  IN  EFI_DRIVER_BINDING_PROTOCOL  *This,
+  IN  EFI_HANDLE                   Controller,
+  IN  UINTN                        NumberOfChildren,
+  IN  EFI_HANDLE                   *ChildHandleBuffer
+  )
+{
+  return EFI_SUCCESS;
+}
+
+
+/**
+  Enqueue the key.
+
+  @param  Queue                 The queue to be enqueued.
+  @param  KeyData               The key data to be enqueued.
+
+  @retval EFI_NOT_READY         The queue is full.
+  @retval EFI_SUCCESS           Successfully enqueued the key data.
+
+**/
+EFI_STATUS
+Enqueue (
+  IN SIMPLE_QUEUE         *Queue,
+  IN EFI_KEY_DATA         *KeyData
+  )
+{
+  if ((Queue->Rear + 1) % QUEUE_MAX_COUNT == Queue->Front) {
+    return EFI_NOT_READY;
+  }
+
+  CopyMem (&Queue->Buffer[Queue->Rear], KeyData, sizeof (EFI_KEY_DATA));
+  Queue->Rear = (Queue->Rear + 1) % QUEUE_MAX_COUNT;
+
+  return EFI_SUCCESS;
+}
+
+/**
+  Dequeue the key.
+
+  @param  Queue                 The queue to be dequeued.
+  @param  KeyData               The key data to be dequeued.
+
+  @retval EFI_NOT_READY         The queue is empty.
+  @retval EFI_SUCCESS           Successfully dequeued the key data.
+
+**/
+EFI_STATUS
+Dequeue (
+  IN SIMPLE_QUEUE         *Queue,
+  IN EFI_KEY_DATA         *KeyData
+  )
+{
+  if (Queue->Front == Queue->Rear) {
+    return EFI_NOT_READY;
+  }
+
+  CopyMem (KeyData, &Queue->Buffer[Queue->Front], sizeof (EFI_KEY_DATA));
+  Queue->Front  = (Queue->Front + 1) % QUEUE_MAX_COUNT;
+
+  return EFI_SUCCESS;
+}
+
+/**
+  Check whether the queue is empty.
+
+  @param  Queue                 The queue to be checked.
+
+  @retval EFI_NOT_READY         The queue is empty.
+  @retval EFI_SUCCESS           The queue is not empty.
+
+**/
+EFI_STATUS
+CheckQueue (
+  IN SIMPLE_QUEUE         *Queue
+  )
+{
+  if (Queue->Front == Queue->Rear) {
+    return EFI_NOT_READY;
+  }
+
+  return EFI_SUCCESS;
+}
+
+/**
+  Check key buffer to get the key stroke status.
+
+  @param  This         Pointer of the protocol EFI_SIMPLE_TEXT_IN_PROTOCOL.
+
+  @retval EFI_SUCCESS  A key is being pressed now.
+  @retval Other        No key is now pressed.
+
+**/
+EFI_STATUS
+EFIAPI
+VirtualKeyboardCheckForKey (
+  IN  EFI_SIMPLE_TEXT_INPUT_PROTOCOL  *This
+  )
+{
+  VIRTUAL_KEYBOARD_DEV     *VirtualKeyboardPrivate;
+
+  VirtualKeyboardPrivate = VIRTUAL_KEYBOARD_DEV_FROM_THIS (This);
+
+  return CheckQueue (&VirtualKeyboardPrivate->Queue);
+}
+
+/**
+  Free keyboard notify list.
+
+  @param  ListHead   The list head
+
+  @retval EFI_SUCCESS           Free the notify list successfully
+  @retval EFI_INVALID_PARAMETER ListHead is invalid.
+
+**/
+EFI_STATUS
+VirtualKeyboardFreeNotifyList (
+  IN OUT LIST_ENTRY           *ListHead
+  )
+{
+  VIRTUAL_KEYBOARD_CONSOLE_IN_EX_NOTIFY *NotifyNode;
+
+  if (ListHead == NULL) {
+    return EFI_INVALID_PARAMETER;
+  }
+  while (!IsListEmpty (ListHead)) {
+    NotifyNode = CR (
+                   ListHead->ForwardLink,
+                   VIRTUAL_KEYBOARD_CONSOLE_IN_EX_NOTIFY,
+                   NotifyEntry,
+                   VIRTUAL_KEYBOARD_CONSOLE_IN_EX_NOTIFY_SIGNATURE
+                   );
+    RemoveEntryList (ListHead->ForwardLink);
+    gBS->FreePool (NotifyNode);
+  }
+
+  return EFI_SUCCESS;
+}
+
+/**
+  Judge whether is a registed key
+
+  @param RegsiteredData       A pointer to a buffer that is filled in with
+                              the keystroke state data for the key that was
+                              registered.
+  @param InputData            A pointer to a buffer that is filled in with
+                              the keystroke state data for the key that was
+                              pressed.
+
+  @retval TRUE                Key be pressed matches a registered key.
+  @retval FLASE               Match failed.
+
+**/
+BOOLEAN
+IsKeyRegistered (
+  IN EFI_KEY_DATA  *RegsiteredData,
+  IN EFI_KEY_DATA  *InputData
+  )
+
+{
+  ASSERT (RegsiteredData != NULL && InputData != NULL);
+
+  if ((RegsiteredData->Key.ScanCode    != InputData->Key.ScanCode) ||
+      (RegsiteredData->Key.UnicodeChar != InputData->Key.UnicodeChar)) {
+    return FALSE;
+  }
+
+  //
+  // Assume KeyShiftState/KeyToggleState = 0 in Registered key data means
+  // these state could be ignored.
+  //
+  if ((RegsiteredData->KeyState.KeyShiftState != 0) &&
+      (RegsiteredData->KeyState.KeyShiftState != InputData->KeyState.KeyShiftState)) {
+    return FALSE;
+  }
+  if ((RegsiteredData->KeyState.KeyToggleState != 0) &&
+      (RegsiteredData->KeyState.KeyToggleState != InputData->KeyState.KeyToggleState)) {
+    return FALSE;
+  }
+
+  return TRUE;
+
+}
+
+/**
+  Event notification function for SIMPLE_TEXT_IN.WaitForKey event
+  Signal the event if there is key available
+
+  @param Event    the event object
+  @param Context  waitting context
+
+**/
+VOID
+EFIAPI
+VirtualKeyboardWaitForKey (
+  IN  EFI_EVENT               Event,
+  IN  VOID                    *Context
+  )
+{
+  //
+  // Stall 1ms to give a chance to let other driver interrupt this routine
+  // for their timer event.
+  // e.g. UI setup or Shell, other drivers which are driven by timer event
+  // will have a bad performance during this period,
+  // e.g. usb keyboard driver.
+  // Add a stall period can greatly increate other driver performance during
+  // the WaitForKey is recursivly invoked. 1ms delay will make little impact
+  // to the thunk keyboard driver, and user can not feel the delay at all when
+  // input.
+  //
+  gBS->Stall (1000);
+  //
+  // Use TimerEvent callback function to check whether there's any key pressed
+  //
+  VirtualKeyboardTimerHandler (NULL, VIRTUAL_KEYBOARD_DEV_FROM_THIS (Context));
+
+  if (!EFI_ERROR (VirtualKeyboardCheckForKey (Context))) {
+    gBS->SignalEvent (Event);
+  }
+}
+
+/**
+  Event notification function for SIMPLE_TEXT_INPUT_EX_PROTOCOL.WaitForKeyEx
+  event. Signal the event if there is key available
+
+  @param Event    event object
+  @param Context  waiting context
+
+**/
+VOID
+EFIAPI
+VirtualKeyboardWaitForKeyEx (
+  IN  EFI_EVENT               Event,
+  IN  VOID                    *Context
+  )
+
+{
+  VIRTUAL_KEYBOARD_DEV                     *VirtualKeyboardPrivate;
+
+  VirtualKeyboardPrivate = TEXT_INPUT_EX_VIRTUAL_KEYBOARD_DEV_FROM_THIS (Context);
+  VirtualKeyboardWaitForKey (Event, &VirtualKeyboardPrivate->SimpleTextIn);
+
+}
+
+//
+// EFI Simple Text In Protocol Functions
+//
+/**
+  Reset the Keyboard and do BAT test for it, if (ExtendedVerification == TRUE)
+  then do some extra keyboard validations.
+
+  @param  This                  Pointer of simple text Protocol.
+  @param  ExtendedVerification  Whether perform the extra validation of
+                                keyboard. True: perform; FALSE: skip.
+
+  @retval EFI_SUCCESS           The command byte is written successfully.
+  @retval EFI_DEVICE_ERROR      Errors occurred during resetting keyboard.
+
+**/
+EFI_STATUS
+EFIAPI
+VirtualKeyboardReset (
+  IN  EFI_SIMPLE_TEXT_INPUT_PROTOCOL  *This,
+  IN  BOOLEAN                         ExtendedVerification
+  )
+{
+  VIRTUAL_KEYBOARD_DEV *VirtualKeyboardPrivate;
+  EFI_STATUS           Status;
+  EFI_TPL              OldTpl;
+
+  VirtualKeyboardPrivate = VIRTUAL_KEYBOARD_DEV_FROM_THIS (This);
+
+  //
+  // Raise TPL to avoid mouse operation impact
+  //
+  OldTpl = gBS->RaiseTPL (TPL_NOTIFY);
+
+  if (VirtualKeyboardPrivate->PlatformVirtual &&
+      VirtualKeyboardPrivate->PlatformVirtual->Reset) {
+    Status = VirtualKeyboardPrivate->PlatformVirtual->Reset ();
+  } else {
+    Status = EFI_INVALID_PARAMETER;
+  }
+
+  //
+  // resume priority of task level
+  //
+  gBS->RestoreTPL (OldTpl);
+
+  return Status;
+}
+
+/**
+  Reset the input device and optionaly run diagnostics
+
+  @param  This                  Protocol instance pointer.
+  @param  ExtendedVerification  Driver may perform diagnostics on reset.
+
+  @retval EFI_SUCCESS           The device was reset.
+  @retval EFI_DEVICE_ERROR      The device is not functioning properly and
+                                could not be reset.
+
+**/
+EFI_STATUS
+EFIAPI
+VirtualKeyboardResetEx (
+  IN EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL  *This,
+  IN BOOLEAN                            ExtendedVerification
+  )
+{
+  VIRTUAL_KEYBOARD_DEV                  *VirtualKeyboardPrivate;
+  EFI_STATUS                            Status;
+  EFI_TPL                               OldTpl;
+
+  VirtualKeyboardPrivate = TEXT_INPUT_EX_VIRTUAL_KEYBOARD_DEV_FROM_THIS (This);
+
+  Status = VirtualKeyboardPrivate->SimpleTextIn.Reset (
+                                     &VirtualKeyboardPrivate->SimpleTextIn,
+                                     ExtendedVerification
+                                     );
+  if (EFI_ERROR (Status)) {
+    return EFI_DEVICE_ERROR;
+  }
+
+  OldTpl = gBS->RaiseTPL (TPL_NOTIFY);
+
+  gBS->RestoreTPL (OldTpl);
+
+  return EFI_SUCCESS;
+
+}
+
+/**
+  Reads the next keystroke from the input device. The WaitForKey Event can
+  be used to test for existance of a keystroke via WaitForEvent () call.
+
+  @param  VirtualKeyboardPrivate   Virtualkeyboard driver private structure.
+  @param  KeyData                  A pointer to a buffer that is filled in
+                                   with the keystroke state data for the key
+                                   that was pressed.
+
+  @retval EFI_SUCCESS              The keystroke information was returned.
+  @retval EFI_NOT_READY            There was no keystroke data availiable.
+  @retval EFI_DEVICE_ERROR         The keystroke information was not returned
+                                   due to hardware errors.
+  @retval EFI_INVALID_PARAMETER    KeyData is NULL.
+
+**/
+EFI_STATUS
+KeyboardReadKeyStrokeWorker (
+  IN VIRTUAL_KEYBOARD_DEV  *VirtualKeyboardPrivate,
+  OUT EFI_KEY_DATA      *KeyData
+  )
+{
+  EFI_STATUS                            Status;
+  EFI_TPL                               OldTpl;
+  if (KeyData == NULL) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  //
+  // Use TimerEvent callback function to check whether there's any key pressed
+  //
+
+  //
+  // Stall 1ms to give a chance to let other driver interrupt this routine for
+  // their timer event.
+  // e.g. OS loader, other drivers which are driven by timer event will have a
+  // bad performance during this period,
+  // e.g. usb keyboard driver.
+  // Add a stall period can greatly increate other driver performance during
+  // the WaitForKey is recursivly invoked. 1ms delay will make little impact
+  // to the thunk keyboard driver, and user can not feel the delay at all when
+  // input.
+  //
+  gBS->Stall (1000);
+
+  OldTpl = gBS->RaiseTPL (TPL_NOTIFY);
+
+  VirtualKeyboardTimerHandler (NULL, VirtualKeyboardPrivate);
+  //
+  // If there's no key, just return
+  //
+  Status = CheckQueue (&VirtualKeyboardPrivate->Queue);
+  if (EFI_ERROR (Status)) {
+    gBS->RestoreTPL (OldTpl);
+    return EFI_NOT_READY;
+  }
+
+  Status = Dequeue (&VirtualKeyboardPrivate->Queue, KeyData);
+
+  gBS->RestoreTPL (OldTpl);
+
+  return EFI_SUCCESS;
+}
+
+/**
+  Read out the scan code of the key that has just been stroked.
+
+  @param  This        Pointer of simple text Protocol.
+  @param  Key         Pointer for store the key that read out.
+
+  @retval EFI_SUCCESS The key is read out successfully.
+  @retval other       The key reading failed.
+
+**/
+EFI_STATUS
+EFIAPI
+VirtualKeyboardReadKeyStroke (
+  IN  EFI_SIMPLE_TEXT_INPUT_PROTOCOL  *This,
+  OUT EFI_INPUT_KEY                   *Key
+  )
+{
+  VIRTUAL_KEYBOARD_DEV     *VirtualKeyboardPrivate;
+  EFI_STATUS               Status;
+  EFI_KEY_DATA             KeyData;
+
+  VirtualKeyboardPrivate = VIRTUAL_KEYBOARD_DEV_FROM_THIS (This);
+
+  Status = KeyboardReadKeyStrokeWorker (VirtualKeyboardPrivate, &KeyData);
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  //
+  // Convert the Ctrl+[a-z] to Ctrl+[1-26]
+  //
+  if ((KeyData.KeyState.KeyShiftState & (EFI_LEFT_CONTROL_PRESSED | EFI_RIGHT_CONTROL_PRESSED)) != 0) {
+    if (KeyData.Key.UnicodeChar >= L'a' &&
+        KeyData.Key.UnicodeChar <= L'z') {
+      KeyData.Key.UnicodeChar = (CHAR16) (KeyData.Key.UnicodeChar - L'a' + 1);
+    } else if (KeyData.Key.UnicodeChar >= L'A' &&
+               KeyData.Key.UnicodeChar <= L'Z') {
+      KeyData.Key.UnicodeChar = (CHAR16) (KeyData.Key.UnicodeChar - L'A' + 1);
+    }
+  }
+
+  CopyMem (Key, &KeyData.Key, sizeof (EFI_INPUT_KEY));
+
+  return EFI_SUCCESS;
+}
+
+/**
+  Reads the next keystroke from the input device. The WaitForKey Event can
+  be used to test for existance of a keystroke via WaitForEvent () call.
+
+  @param  This         Protocol instance pointer.
+  @param  KeyData      A pointer to a buffer that is filled in with the
+                       keystroke state data for the key that was pressed.
+
+  @retval  EFI_SUCCESS           The keystroke information was returned.
+  @retval  EFI_NOT_READY         There was no keystroke data availiable.
+  @retval  EFI_DEVICE_ERROR      The keystroke information was not returned
+                                 due to hardware errors.
+  @retval  EFI_INVALID_PARAMETER KeyData is NULL.
+
+**/
+EFI_STATUS
+EFIAPI
+VirtualKeyboardReadKeyStrokeEx (
+  IN  EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL *This,
+  OUT EFI_KEY_DATA                      *KeyData
+  )
+{
+  VIRTUAL_KEYBOARD_DEV                  *VirtualKeyboardPrivate;
+
+  if (KeyData == NULL) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  VirtualKeyboardPrivate = TEXT_INPUT_EX_VIRTUAL_KEYBOARD_DEV_FROM_THIS (This);
+
+  return KeyboardReadKeyStrokeWorker (VirtualKeyboardPrivate, KeyData);
+
+}
+
+/**
+  Set certain state for the input device.
+
+  @param  This              Protocol instance pointer.
+  @param  KeyToggleState    A pointer to the EFI_KEY_TOGGLE_STATE to set the
+                            state for the input device.
+
+  @retval EFI_SUCCESS           The device state was set successfully.
+  @retval EFI_DEVICE_ERROR      The device is not functioning correctly and
+                                could not have the setting adjusted.
+  @retval EFI_UNSUPPORTED       The device does not have the ability to set
+                                its state.
+  @retval EFI_INVALID_PARAMETER KeyToggleState is NULL.
+
+**/
+EFI_STATUS
+EFIAPI
+VirtualKeyboardSetState (
+  IN EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL  *This,
+  IN EFI_KEY_TOGGLE_STATE               *KeyToggleState
+  )
+{
+  if (KeyToggleState == NULL) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  return EFI_SUCCESS;
+}
+
+/**
+  Register a notification function for a particular keystroke for the
+  input device.
+
+  @param  This                    Protocol instance pointer.
+  @param  KeyData                 A pointer to a buffer that is filled in with
+                                  the keystroke information data for the key
+                                  that was pressed.
+  @param  KeyNotificationFunction Points to the function to be called when the
+                                  key sequence is typed specified by KeyData.
+  @param  NotifyHandle            Points to the unique handle assigned to the
+                                  registered notification.
+
+
+  @retval EFI_SUCCESS             The notification function was registered
+                                  successfully.
+  @retval EFI_OUT_OF_RESOURCES    Unable to allocate resources for necesssary
+                                  data structures.
+  @retval EFI_INVALID_PARAMETER   KeyData or NotifyHandle is NULL.
+
+**/
+EFI_STATUS
+EFIAPI
+VirtualKeyboardRegisterKeyNotify (
+  IN EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL  *This,
+  IN EFI_KEY_DATA                       *KeyData,
+  IN EFI_KEY_NOTIFY_FUNCTION            KeyNotificationFunction,
+  OUT VOID                              **NotifyHandle
+  )
+{
+  EFI_STATUS                            Status;
+  VIRTUAL_KEYBOARD_DEV                  *VirtualKeyboardPrivate;
+  EFI_TPL                               OldTpl;
+  VIRTUAL_KEYBOARD_CONSOLE_IN_EX_NOTIFY *NewNotify;
+  LIST_ENTRY                            *Link;
+  VIRTUAL_KEYBOARD_CONSOLE_IN_EX_NOTIFY *CurrentNotify;
+
+  if (KeyData == NULL ||
+      NotifyHandle == NULL ||
+      KeyNotificationFunction == NULL) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  VirtualKeyboardPrivate = TEXT_INPUT_EX_VIRTUAL_KEYBOARD_DEV_FROM_THIS (This);
+
+  //
+  // Enter critical section
+  //
+  OldTpl = gBS->RaiseTPL (TPL_NOTIFY);
+
+  //
+  // Return EFI_SUCCESS if the (KeyData, NotificationFunction) is already
+  // registered.
+  //
+  for (Link = VirtualKeyboardPrivate->NotifyList.ForwardLink;
+       Link != &VirtualKeyboardPrivate->NotifyList;
+       Link = Link->ForwardLink) {
+    CurrentNotify = CR (
+                      Link,
+                      VIRTUAL_KEYBOARD_CONSOLE_IN_EX_NOTIFY,
+                      NotifyEntry,
+                      VIRTUAL_KEYBOARD_CONSOLE_IN_EX_NOTIFY_SIGNATURE
+                      );
+    if (IsKeyRegistered (&CurrentNotify->KeyData, KeyData)) {
+      if (CurrentNotify->KeyNotificationFn == KeyNotificationFunction) {
+        *NotifyHandle = CurrentNotify;
+        Status = EFI_SUCCESS;
+        goto Exit;
+      }
+    }
+  }
+
+  //
+  // Allocate resource to save the notification function
+  //
+
+  NewNotify = (VIRTUAL_KEYBOARD_CONSOLE_IN_EX_NOTIFY *) AllocateZeroPool (sizeof (VIRTUAL_KEYBOARD_CONSOLE_IN_EX_NOTIFY));
+  if (NewNotify == NULL) {
+    Status = EFI_OUT_OF_RESOURCES;
+    goto Exit;
+  }
+
+  NewNotify->Signature         = VIRTUAL_KEYBOARD_CONSOLE_IN_EX_NOTIFY_SIGNATURE;
+  NewNotify->KeyNotificationFn = KeyNotificationFunction;
+  CopyMem (&NewNotify->KeyData, KeyData, sizeof (EFI_KEY_DATA));
+  InsertTailList (&VirtualKeyboardPrivate->NotifyList, &NewNotify->NotifyEntry);
+
+  *NotifyHandle                = NewNotify;
+  Status                       = EFI_SUCCESS;
+
+Exit:
+  //
+  // Leave critical section and return
+  //
+  gBS->RestoreTPL (OldTpl);
+  return Status;
+
+}
+
+/**
+  Remove a registered notification function from a particular keystroke.
+
+  @param  This                 Protocol instance pointer.
+  @param  NotificationHandle   The handle of the notification function
+                               being unregistered.
+
+  @retval EFI_SUCCESS             The notification function was unregistered
+                                  successfully.
+  @retval EFI_INVALID_PARAMETER   The NotificationHandle is invalid.
+
+**/
+EFI_STATUS
+EFIAPI
+VirtualKeyboardUnregisterKeyNotify (
+  IN EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL  *This,
+  IN VOID                               *NotificationHandle
+  )
+{
+  EFI_STATUS                            Status;
+  VIRTUAL_KEYBOARD_DEV                  *VirtualKeyboardPrivate;
+  EFI_TPL                               OldTpl;
+  LIST_ENTRY                            *Link;
+  VIRTUAL_KEYBOARD_CONSOLE_IN_EX_NOTIFY *CurrentNotify;
+
+  //
+  // Check incoming notification handle
+  //
+  if (NotificationHandle == NULL) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  if (((VIRTUAL_KEYBOARD_CONSOLE_IN_EX_NOTIFY *) NotificationHandle)->Signature !=
+      VIRTUAL_KEYBOARD_CONSOLE_IN_EX_NOTIFY_SIGNATURE) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  VirtualKeyboardPrivate = TEXT_INPUT_EX_VIRTUAL_KEYBOARD_DEV_FROM_THIS (This);
+
+  //
+  // Enter critical section
+  //
+  OldTpl = gBS->RaiseTPL (TPL_NOTIFY);
+
+  for (Link = VirtualKeyboardPrivate->NotifyList.ForwardLink;
+       Link != &VirtualKeyboardPrivate->NotifyList;
+       Link = Link->ForwardLink) {
+    CurrentNotify = CR (
+                      Link,
+                      VIRTUAL_KEYBOARD_CONSOLE_IN_EX_NOTIFY,
+                      NotifyEntry,
+                      VIRTUAL_KEYBOARD_CONSOLE_IN_EX_NOTIFY_SIGNATURE
+                      );
+    if (CurrentNotify == NotificationHandle) {
+      //
+      // Remove the notification function from NotifyList and free resources
+      //
+      RemoveEntryList (&CurrentNotify->NotifyEntry);
+
+      Status = EFI_SUCCESS;
+      goto Exit;
+    }
+  }
+
+  //
+  // Can not find the specified Notification Handle
+  //
+  Status = EFI_INVALID_PARAMETER;
+
+Exit:
+  //
+  // Leave critical section and return
+  //
+  gBS->RestoreTPL (OldTpl);
+  return Status;
+}
+
+/**
+  Timer event handler: read a series of scancodes from 8042
+  and put them into memory scancode buffer.
+  it read as much scancodes to either fill
+  the memory buffer or empty the keyboard buffer.
+  It is registered as running under TPL_NOTIFY
+
+  @param Event       The timer event
+  @param Context     A KEYBOARD_CONSOLE_IN_DEV pointer
+
+**/
+VOID
+EFIAPI
+VirtualKeyboardTimerHandler (
+  IN EFI_EVENT    Event,
+  IN VOID         *Context
+  )
+{
+  EFI_TPL                                OldTpl;
+  LIST_ENTRY                             *Link;
+  EFI_KEY_DATA                           KeyData;
+  VIRTUAL_KEYBOARD_CONSOLE_IN_EX_NOTIFY  *CurrentNotify;
+  VIRTUAL_KEYBOARD_DEV                   *VirtualKeyboardPrivate;
+  VIRTUAL_KBD_KEY                        VirtualKey;
+
+  VirtualKeyboardPrivate = Context;
+
+  //
+  // Enter critical section
+  //
+  OldTpl = gBS->RaiseTPL (TPL_NOTIFY);
+
+  if (VirtualKeyboardPrivate->PlatformVirtual &&
+      VirtualKeyboardPrivate->PlatformVirtual->Query) {
+    if (VirtualKeyboardPrivate->PlatformVirtual->Query (&VirtualKey) ==
+        FALSE) {
+      goto Exit;
+    }
+    // Found key
+    KeyData.Key.ScanCode = VirtualKey.Key.ScanCode;
+    KeyData.Key.UnicodeChar = VirtualKey.Key.UnicodeChar;
+    KeyData.KeyState.KeyShiftState  = EFI_SHIFT_STATE_VALID;
+    KeyData.KeyState.KeyToggleState = EFI_TOGGLE_STATE_VALID;
+    if (VirtualKeyboardPrivate->PlatformVirtual->Clear) {
+      VirtualKeyboardPrivate->PlatformVirtual->Clear (&VirtualKey);
+    }
+  } else {
+    goto Exit;
+  }
+
+  //
+  // Signal KeyNotify process event if this key pressed matches any key registered.
+  //
+  for (Link = VirtualKeyboardPrivate->NotifyList.ForwardLink;
+       Link != &VirtualKeyboardPrivate->NotifyList;
+       Link = Link->ForwardLink) {
+    CurrentNotify = CR (
+                      Link,
+                      VIRTUAL_KEYBOARD_CONSOLE_IN_EX_NOTIFY,
+                      NotifyEntry,
+                      VIRTUAL_KEYBOARD_CONSOLE_IN_EX_NOTIFY_SIGNATURE
+                      );
+    if (IsKeyRegistered (&CurrentNotify->KeyData, &KeyData)) {
+      //
+      // The key notification function needs to run at TPL_CALLBACK
+      // while current TPL is TPL_NOTIFY. It will be invoked in
+      // KeyNotifyProcessHandler() which runs at TPL_CALLBACK.
+      //
+      Enqueue (&VirtualKeyboardPrivate->QueueForNotify, &KeyData);
+      gBS->SignalEvent (VirtualKeyboardPrivate->KeyNotifyProcessEvent);
+    }
+  }
+
+  Enqueue (&VirtualKeyboardPrivate->Queue, &KeyData);
+
+Exit:
+  //
+  // Leave critical section and return
+  //
+  gBS->RestoreTPL (OldTpl);
+}
+
+/**
+  Process key notify.
+
+  @param  Event                 Indicates the event that invoke this function.
+  @param  Context               Indicates the calling context.
+**/
+VOID
+EFIAPI
+KeyNotifyProcessHandler (
+  IN  EFI_EVENT                 Event,
+  IN  VOID                      *Context
+  )
+{
+  EFI_STATUS                            Status;
+  VIRTUAL_KEYBOARD_DEV                  *VirtualKeyboardPrivate;
+  EFI_KEY_DATA                          KeyData;
+  LIST_ENTRY                            *Link;
+  LIST_ENTRY                            *NotifyList;
+  VIRTUAL_KEYBOARD_CONSOLE_IN_EX_NOTIFY *CurrentNotify;
+  EFI_TPL                               OldTpl;
+
+  VirtualKeyboardPrivate = (VIRTUAL_KEYBOARD_DEV *) Context;
+
+  //
+  // Invoke notification functions.
+  //
+  NotifyList = &VirtualKeyboardPrivate->NotifyList;
+  while (TRUE) {
+    //
+    // Enter critical section
+    //
+    OldTpl = gBS->RaiseTPL (TPL_NOTIFY);
+    Status = Dequeue (&VirtualKeyboardPrivate->QueueForNotify, &KeyData);
+    //
+    // Leave critical section
+    //
+    gBS->RestoreTPL (OldTpl);
+    if (EFI_ERROR (Status)) {
+      break;
+    }
+    for (Link = GetFirstNode (NotifyList);
+         !IsNull (NotifyList, Link);
+         Link = GetNextNode (NotifyList, Link)) {
+      CurrentNotify = CR (Link,
+                        VIRTUAL_KEYBOARD_CONSOLE_IN_EX_NOTIFY,
+                        NotifyEntry,
+                        VIRTUAL_KEYBOARD_CONSOLE_IN_EX_NOTIFY_SIGNATURE
+                        );
+      if (IsKeyRegistered (&CurrentNotify->KeyData, &KeyData)) {
+        CurrentNotify->KeyNotificationFn (&KeyData);
+      }
+    }
+  }
+}
+
+/**
+  The user Entry Point for module VirtualKeyboard. The user code starts with
+  this function.
+
+  @param[in] ImageHandle    The firmware allocated handle for the EFI image.
+  @param[in] SystemTable    A pointer to the EFI System Table.
+
+  @retval EFI_SUCCESS       The entry point is executed successfully.
+  @retval other             Some error occurs when executing this entry point.
+
+**/
+EFI_STATUS
+EFIAPI
+InitializeVirtualKeyboard(
+  IN EFI_HANDLE           ImageHandle,
+  IN EFI_SYSTEM_TABLE     *SystemTable
+  )
+{
+  EFI_STATUS              Status;
+
+  //
+  // Install driver model protocol(s).
+  //
+  Status = EfiLibInstallDriverBindingComponentName2 (
+             ImageHandle,
+             SystemTable,
+             &gVirtualKeyboardDriverBinding,
+             ImageHandle,
+             &gVirtualKeyboardComponentName,
+             &gVirtualKeyboardComponentName2
+             );
+  ASSERT_EFI_ERROR (Status);
+
+  return Status;
+}