[PATCH v2] MdeModulePkg/ConPlatform: Support short-form USB device path

* [PATCH v2] MdeModulePkg/ConPlatform: Support short-form USB device path
@ 2018-05-02  7:51 Ruiyu Ni
  2018-05-02  8:00 ` Zeng, Star
  0 siblings, 1 reply; 2+ messages in thread
From: Ruiyu Ni @ 2018-05-02  7:51 UTC (permalink / raw)
  To: edk2-devel; +Cc: Hao A Wu, Michael D Kinney, Star Zeng

Today's implementation does an exact device path match to check
whether the device path of a console is in ConIn/ConOut/ErrOut.
But that doesn't work for the USB keyboard.
Because when a platform have multiple USB port, ConIn needs to
carry all device paths corresponding to each port.
Even worse, today's BDS core logic removes the device path from
ConIn/ConOut/ErrOut when the connection to that device path fails.
So if user switches the USB keyboard from one port to another across
boot, the USB keyboard doesn't work in the second boot.

ConPlatform driver solved this problem by adding the
IsHotPlugDevice() function. So that for USB keyboard, ConPlatform
doesn't care whether its device path is in ConIn or not.
But the rule is too loose, and now causes platform BDS cannot control
whether to enable USB keyboard as an active console.

The patch changes ConPlatform to support USB short-form device path
when checking whether the device path of a console is in
ConIn/ConOut/ErrOut.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
Cc: Hao A Wu <hao.a.wu@intel.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Star Zeng <star.zeng@intel.com>
---
 .../Universal/Console/ConPlatformDxe/ConPlatform.c | 534 ++++++++++++++-------
 .../Universal/Console/ConPlatformDxe/ConPlatform.h |  30 +-
 .../Console/ConPlatformDxe/ConPlatformDxe.inf      |   3 +-
 3 files changed, 361 insertions(+), 206 deletions(-)

diff --git a/MdeModulePkg/Universal/Console/ConPlatformDxe/ConPlatform.c b/MdeModulePkg/Universal/Console/ConPlatformDxe/ConPlatform.c
index 6b53e8ac74..e12876a34b 100644
--- a/MdeModulePkg/Universal/Console/ConPlatformDxe/ConPlatform.c
+++ b/MdeModulePkg/Universal/Console/ConPlatformDxe/ConPlatform.c
@@ -2,7 +2,7 @@
   Console Platform DXE Driver, install Console Device Guids and update Console
   Environment Variables.
 
-Copyright (c) 2006 - 2017, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2006 - 2018, Intel Corporation. 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
@@ -202,9 +202,8 @@ ConPlatformDriverBindingSupported (
   Start this driver on ControllerHandle by opening Simple Text Input Protocol,
   reading Device Path, and installing Console In Devcice GUID on ControllerHandle.
 
-  If this devcie is not one hot-plug devce, append its device path into the 
-  console environment variables ConInDev.
-  
+  Append its device path into the console environment variables ConInDev.
+
   @param  This                 Protocol instance pointer.
   @param  ControllerHandle     Handle of device to bind driver to
   @param  RemainingDevicePath  Optional parameter use to pick a specific child
@@ -270,58 +269,32 @@ ConPlatformTextInDriverBindingStart (
   }
 
   //
-  // Check the device path, if it is a hot plug device,
-  // do not put the device path into ConInDev, and install
-  // gEfiConsoleInDeviceGuid to the device handle directly.
-  // The policy is, make hot plug device plug in and play immediately.
+  // Append the device path to the ConInDev environment variable
+  //
+  ConPlatformUpdateDeviceVariable (
+    L"ConInDev",
+    DevicePath,
+    Append
+    );
+
+  //
+  // If the device path is an instance in the ConIn environment variable,
+  // then install EfiConsoleInDeviceGuid onto ControllerHandle
   //
-  if (IsHotPlugDevice (DevicePath)) {
+  if (IsInConInVariable) {
     gBS->InstallMultipleProtocolInterfaces (
            &ControllerHandle,
            &gEfiConsoleInDeviceGuid,
            NULL,
            NULL
            );
-    //
-    // Append the device path to ConInDev only if it is in ConIn variable.
-    //
-    if (IsInConInVariable) {
-      ConPlatformUpdateDeviceVariable (
-        L"ConInDev",
-        DevicePath,
-        Append
-        );
-    }
   } else {
-    //
-    // If it is not a hot-plug device, append the device path to the
-    // ConInDev environment variable
-    //
-    ConPlatformUpdateDeviceVariable (
-      L"ConInDev",
-      DevicePath,
-      Append
-      );
-
-    //
-    // If the device path is an instance in the ConIn environment variable,
-    // then install EfiConsoleInDeviceGuid onto ControllerHandle
-    //
-    if (IsInConInVariable) {
-      gBS->InstallMultipleProtocolInterfaces (
-             &ControllerHandle,
-             &gEfiConsoleInDeviceGuid,
-             NULL,
-             NULL
-             );
-    } else {
-      gBS->CloseProtocol (
-             ControllerHandle,
-             &gEfiSimpleTextInProtocolGuid,
-             This->DriverBindingHandle,
-             ControllerHandle
-             );
-    }
+    gBS->CloseProtocol (
+           ControllerHandle,
+           &gEfiSimpleTextInProtocolGuid,
+           This->DriverBindingHandle,
+           ControllerHandle
+           );
   }
 
   return EFI_SUCCESS;
@@ -334,9 +307,8 @@ ConPlatformTextInDriverBindingStart (
   reading Device Path, and installing Console Out Devcic GUID, Standard Error
   Device GUID on ControllerHandle.
 
-  If this devcie is not one hot-plug devce, append its device path into the 
-  console environment variables ConOutDev, ErrOutDev.
-  
+  Append its device path into the console environment variables ConOutDev, ErrOutDev.
+
   @param  This                 Protocol instance pointer.
   @param  ControllerHandle     Handle of device to bind driver to
   @param  RemainingDevicePath  Optional parameter use to pick a specific child
@@ -416,95 +388,59 @@ ConPlatformTextOutDriverBindingStart (
   }
 
   //
-  // Check the device path, if it is a hot plug device,
-  // do not put the device path into ConOutDev and ErrOutDev,
-  // and install gEfiConsoleOutDeviceGuid to the device handle directly.
-  // The policy is, make hot plug device plug in and play immediately.
+  // Append the device path to the ConOutDev and ErrOutDev environment variable.
+  // For GOP device path, append the sibling device path as well.
   //
-  if (IsHotPlugDevice (DevicePath)) {
+  if (!ConPlatformUpdateGopCandidate (DevicePath)) {
+    ConPlatformUpdateDeviceVariable (
+      L"ConOutDev",
+      DevicePath,
+      Append
+      );
+    //
+    // Then append the device path to the ErrOutDev environment variable
+    //
+    ConPlatformUpdateDeviceVariable (
+      L"ErrOutDev",
+      DevicePath,
+      Append
+      );
+  }
+
+  //
+  // If the device path is an instance in the ConOut environment variable,
+  // then install EfiConsoleOutDeviceGuid onto ControllerHandle
+  //
+  if (IsInConOutVariable) {
+    NeedClose = FALSE;
+    Status = gBS->InstallMultipleProtocolInterfaces (
+                    &ControllerHandle,
+                    &gEfiConsoleOutDeviceGuid,
+                    NULL,
+                    NULL
+                    );
+  }
+  //
+  // If the device path is an instance in the ErrOut environment variable,
+  // then install EfiStandardErrorDeviceGuid onto ControllerHandle
+  //
+  if (IsInErrOutVariable) {
+    NeedClose = FALSE;
     gBS->InstallMultipleProtocolInterfaces (
            &ControllerHandle,
-           &gEfiConsoleOutDeviceGuid,
+           &gEfiStandardErrorDeviceGuid,
            NULL,
            NULL
            );
-    //
-    // Append the device path to ConOutDev only if it is in ConOut variable.
-    //
-    if (IsInConOutVariable) {
-      ConPlatformUpdateDeviceVariable (
-        L"ConOutDev",
-        DevicePath,
-        Append
-        );
-    }
-    //
-    // Append the device path to ErrOutDev only if it is in ErrOut variable.
-    //
-    if (IsInErrOutVariable) {
-      ConPlatformUpdateDeviceVariable (
-        L"ErrOutDev",
-        DevicePath,
-        Append
-        );
-    }
-  } else {
-    //
-    // If it is not a hot-plug device, append the device path to 
-    // the ConOutDev and ErrOutDev environment variable.
-    // For GOP device path, append the sibling device path as well.
-    //
-    if (!ConPlatformUpdateGopCandidate (DevicePath)) {
-      ConPlatformUpdateDeviceVariable (
-        L"ConOutDev",
-        DevicePath,
-        Append
-        );
-      //
-      // Then append the device path to the ErrOutDev environment variable
-      //
-      ConPlatformUpdateDeviceVariable (
-        L"ErrOutDev",
-        DevicePath,
-        Append
-        );
-    }
-
-    //
-    // If the device path is an instance in the ConOut environment variable,
-    // then install EfiConsoleOutDeviceGuid onto ControllerHandle
-    //
-    if (IsInConOutVariable) {
-      NeedClose = FALSE;
-      Status = gBS->InstallMultipleProtocolInterfaces (
-                      &ControllerHandle,
-                      &gEfiConsoleOutDeviceGuid,
-                      NULL,
-                      NULL
-                      );
-    }
-    //
-    // If the device path is an instance in the ErrOut environment variable,
-    // then install EfiStandardErrorDeviceGuid onto ControllerHandle
-    //
-    if (IsInErrOutVariable) {
-      NeedClose = FALSE;
-      gBS->InstallMultipleProtocolInterfaces (
-             &ControllerHandle,
-             &gEfiStandardErrorDeviceGuid,
-             NULL,
-             NULL
-             );
-    }
+  }
 
-    if (NeedClose) {
-      gBS->CloseProtocol (
-             ControllerHandle,
-             &gEfiSimpleTextOutProtocolGuid,
-             This->DriverBindingHandle,
-             ControllerHandle
-             );
-    }
+  if (NeedClose) {
+    gBS->CloseProtocol (
+           ControllerHandle,
+           &gEfiSimpleTextOutProtocolGuid,
+           This->DriverBindingHandle,
+           ControllerHandle
+           );
   }
 
   return EFI_SUCCESS;
@@ -822,6 +758,288 @@ IsGopSibling (
   return (BOOLEAN) (CompareMem (Left, Right, (UINTN) NodeLeft - (UINTN) Left) == 0);
 }
 
+/**
+  Check whether a USB device match the specified USB Class device path. This
+  function follows "Load Option Processing" behavior in UEFI specification.
+
+  @param UsbIo       USB I/O protocol associated with the USB device.
+  @param UsbClass    The USB Class device path to match.
+
+  @retval TRUE       The USB device match the USB Class device path.
+  @retval FALSE      The USB device does not match the USB Class device path.
+
+**/
+BOOLEAN
+MatchUsbClass (
+  IN EFI_USB_IO_PROTOCOL        *UsbIo,
+  IN USB_CLASS_DEVICE_PATH      *UsbClass
+  )
+{
+  EFI_STATUS                    Status;
+  EFI_USB_DEVICE_DESCRIPTOR     DevDesc;
+  EFI_USB_INTERFACE_DESCRIPTOR  IfDesc;
+  UINT8                         DeviceClass;
+  UINT8                         DeviceSubClass;
+  UINT8                         DeviceProtocol;
+
+  if ((DevicePathType (UsbClass) != MESSAGING_DEVICE_PATH) ||
+      (DevicePathSubType (UsbClass) != MSG_USB_CLASS_DP)){
+    return FALSE;
+  }
+
+  //
+  // Check Vendor Id and Product Id.
+  //
+  Status = UsbIo->UsbGetDeviceDescriptor (UsbIo, &DevDesc);
+  if (EFI_ERROR (Status)) {
+    return FALSE;
+  }
+
+  if ((UsbClass->VendorId != 0xffff) &&
+      (UsbClass->VendorId != DevDesc.IdVendor)) {
+    return FALSE;
+  }
+
+  if ((UsbClass->ProductId != 0xffff) &&
+      (UsbClass->ProductId != DevDesc.IdProduct)) {
+    return FALSE;
+  }
+
+  DeviceClass    = DevDesc.DeviceClass;
+  DeviceSubClass = DevDesc.DeviceSubClass;
+  DeviceProtocol = DevDesc.DeviceProtocol;
+  if (DeviceClass == 0) {
+    //
+    // If Class in Device Descriptor is set to 0, use the Class, SubClass and
+    // Protocol in Interface Descriptor instead.
+    //
+    Status = UsbIo->UsbGetInterfaceDescriptor (UsbIo, &IfDesc);
+    if (EFI_ERROR (Status)) {
+      return FALSE;
+    }
+
+    DeviceClass    = IfDesc.InterfaceClass;
+    DeviceSubClass = IfDesc.InterfaceSubClass;
+    DeviceProtocol = IfDesc.InterfaceProtocol;
+  }
+
+  //
+  // Check Class, SubClass and Protocol.
+  //
+  if ((UsbClass->DeviceClass != 0xff) &&
+      (UsbClass->DeviceClass != DeviceClass)) {
+    return FALSE;
+  }
+
+  if ((UsbClass->DeviceSubClass != 0xff) &&
+      (UsbClass->DeviceSubClass != DeviceSubClass)) {
+    return FALSE;
+  }
+
+  if ((UsbClass->DeviceProtocol != 0xff) &&
+      (UsbClass->DeviceProtocol != DeviceProtocol)) {
+    return FALSE;
+  }
+
+  return TRUE;
+}
+
+/**
+  Check whether a USB device match the specified USB WWID device path. This
+  function follows "Load Option Processing" behavior in UEFI specification.
+
+  @param UsbIo       USB I/O protocol associated with the USB device.
+  @param UsbWwid     The USB WWID device path to match.
+
+  @retval TRUE       The USB device match the USB WWID device path.
+  @retval FALSE      The USB device does not match the USB WWID device path.
+
+**/
+BOOLEAN
+MatchUsbWwid (
+  IN EFI_USB_IO_PROTOCOL        *UsbIo,
+  IN USB_WWID_DEVICE_PATH       *UsbWwid
+  )
+{
+  EFI_STATUS                   Status;
+  EFI_USB_DEVICE_DESCRIPTOR    DevDesc;
+  EFI_USB_INTERFACE_DESCRIPTOR IfDesc;
+  UINT16                       *LangIdTable;
+  UINT16                       TableSize;
+  UINT16                       Index;
+  CHAR16                       *CompareStr;
+  UINTN                        CompareLen;
+  CHAR16                       *SerialNumberStr;
+  UINTN                        Length;
+
+  if ((DevicePathType (UsbWwid) != MESSAGING_DEVICE_PATH) ||
+      (DevicePathSubType (UsbWwid) != MSG_USB_WWID_DP)) {
+    return FALSE;
+  }
+
+  //
+  // Check Vendor Id and Product Id.
+  //
+  Status = UsbIo->UsbGetDeviceDescriptor (UsbIo, &DevDesc);
+  if (EFI_ERROR (Status)) {
+    return FALSE;
+  }
+  if ((DevDesc.IdVendor != UsbWwid->VendorId) ||
+      (DevDesc.IdProduct != UsbWwid->ProductId)) {
+    return FALSE;
+  }
+
+  //
+  // Check Interface Number.
+  //
+  Status = UsbIo->UsbGetInterfaceDescriptor (UsbIo, &IfDesc);
+  if (EFI_ERROR (Status)) {
+    return FALSE;
+  }
+  if (IfDesc.InterfaceNumber != UsbWwid->InterfaceNumber) {
+    return FALSE;
+  }
+
+  //
+  // Check Serial Number.
+  //
+  if (DevDesc.StrSerialNumber == 0) {
+    return FALSE;
+  }
+
+  //
+  // Get all supported languages.
+  //
+  TableSize = 0;
+  LangIdTable = NULL;
+  Status = UsbIo->UsbGetSupportedLanguages (UsbIo, &LangIdTable, &TableSize);
+  if (EFI_ERROR (Status) || (TableSize == 0) || (LangIdTable == NULL)) {
+    return FALSE;
+  }
+
+  //
+  // Serial number in USB WWID device path is the last 64-or-less UTF-16 characters.
+  //
+  CompareStr = (CHAR16 *) (UINTN) (UsbWwid + 1);
+  CompareLen = (DevicePathNodeLength (UsbWwid) - sizeof (USB_WWID_DEVICE_PATH)) / sizeof (CHAR16);
+  if (CompareStr[CompareLen - 1] == L'\0') {
+    CompareLen--;
+  }
+
+  //
+  // Compare serial number in each supported language.
+  //
+  for (Index = 0; Index < TableSize / sizeof (UINT16); Index++) {
+    SerialNumberStr = NULL;
+    Status = UsbIo->UsbGetStringDescriptor (
+                      UsbIo,
+                      LangIdTable[Index],
+                      DevDesc.StrSerialNumber,
+                      &SerialNumberStr
+                      );
+    if (EFI_ERROR (Status) || (SerialNumberStr == NULL)) {
+      continue;
+    }
+
+    Length = StrLen (SerialNumberStr);
+    if ((Length >= CompareLen) &&
+        (CompareMem (SerialNumberStr + Length - CompareLen, CompareStr, CompareLen * sizeof (CHAR16)) == 0)) {
+      FreePool (SerialNumberStr);
+      return TRUE;
+    }
+
+    FreePool (SerialNumberStr);
+  }
+
+  return FALSE;
+}
+
+/**
+  Compare whether a full console device path matches a USB shortform device path.
+
+  @param[in] FullPath      Full console device path.
+  @param[in] ShortformPath Short-form device path. Short-form device node may in the beginning or in the middle.
+
+  @retval TRUE  The full console device path matches the short-form device path.
+  @retval FALSE The full console device path doesn't match the short-form device path.
+**/
+BOOLEAN
+MatchUsbShortformDevicePath (
+  IN EFI_DEVICE_PATH_PROTOCOL  *FullPath,
+  IN EFI_DEVICE_PATH_PROTOCOL  *ShortformPath
+  )
+{
+  EFI_STATUS                Status;
+  EFI_DEVICE_PATH_PROTOCOL  *ShortformNode;
+  EFI_DEVICE_PATH_PROTOCOL  *ShortformRemainingDevicePath;
+  UINTN                     ParentDevicePathSize;
+  EFI_DEVICE_PATH_PROTOCOL  *RemainingDevicePath;
+  EFI_USB_IO_PROTOCOL       *UsbIo;
+  EFI_HANDLE                Handle;
+
+  for ( ShortformNode = ShortformPath
+      ; !IsDevicePathEnd (ShortformNode)
+      ; ShortformNode = NextDevicePathNode (ShortformNode)
+      ) {
+    if ((DevicePathType (ShortformNode) == MESSAGING_DEVICE_PATH) &&
+        ((DevicePathSubType (ShortformNode) == MSG_USB_CLASS_DP) ||
+         (DevicePathSubType (ShortformNode) == MSG_USB_WWID_DP))
+        ) {
+      break;
+    }
+  }
+
+  //
+  // Skip further compare when it's not a shortform device path.
+  //
+  if (IsDevicePathEnd (ShortformNode)) {
+    return FALSE;
+  }
+
+  //
+  // Match the parent device path below USB layer when the ShortformPath doesn't start with short-form node.
+  //
+  ParentDevicePathSize          = (UINTN) ShortformNode - (UINTN) ShortformPath;
+  ShortformRemainingDevicePath  = NextDevicePathNode (ShortformNode);
+  
+  RemainingDevicePath = FullPath;
+  Status              = gBS->LocateDevicePath (&gEfiUsbIoProtocolGuid, &RemainingDevicePath, &Handle);
+  if (EFI_ERROR (Status)) {
+    return FALSE;
+  }
+
+  if (ParentDevicePathSize != 0) {
+    //
+    // Skip comparing the parent device path when ShortformPath begins with short-form node.
+    //
+    if ((ParentDevicePathSize != (UINTN) RemainingDevicePath - (UINTN) FullPath) ||
+        (CompareMem (FullPath, ShortformPath, ParentDevicePathSize) != 0)) {
+      return FALSE;
+    }
+  }
+
+  //
+  // Match the remaining device path above USB layer.
+  // For USB keyboard, the remaining device path above USB layer is END node.
+  //
+  if (CompareMem (RemainingDevicePath, ShortformRemainingDevicePath, GetDevicePathSize (RemainingDevicePath)) != 0) {
+    return FALSE;
+  }
+
+  //
+  // Match the USB layer.
+  //
+  Status = gBS->HandleProtocol(
+                  Handle,
+                  &gEfiUsbIoProtocolGuid,
+                  (VOID **) &UsbIo
+                  );
+  ASSERT_EFI_ERROR (Status);
+  
+  return MatchUsbClass (UsbIo, (USB_CLASS_DEVICE_PATH *)ShortformNode) ||
+         MatchUsbWwid (UsbIo, (USB_WWID_DEVICE_PATH *)ShortformNode);
+}
+
 /**
   Function compares a device path data structure to that of all the nodes of a
   second device path instance.
@@ -881,7 +1099,8 @@ ConPlatformMatchDevicePaths (
   // Search for the match of 'Single' in 'Multi'
   //
   while (DevicePathInst != NULL) {
-    if ((CompareMem (Single, DevicePathInst, Size) == 0) || IsGopSibling (Single, DevicePathInst)) {
+    if ((CompareMem (Single, DevicePathInst, Size) == 0) ||
+      IsGopSibling (Single, DevicePathInst) || MatchUsbShortformDevicePath (Single, DevicePathInst)) {
       if (!Delete) {
         //
         // If Delete is FALSE, return EFI_SUCCESS if Single is found in Multi.
@@ -1029,53 +1248,6 @@ ConPlatformUpdateDeviceVariable (
   return Status;
 }
 
-/**
-  Check if the device supports hot-plug through its device path.
-
-  This function could be updated to check more types of Hot Plug devices.
-  Currently, it checks USB and PCCard device.
-
-  @param  DevicePath            Pointer to device's device path.
-
-  @retval TRUE                  The devcie is a hot-plug device
-  @retval FALSE                 The devcie is not a hot-plug device.
-
-**/
-BOOLEAN
-IsHotPlugDevice (
-  IN  EFI_DEVICE_PATH_PROTOCOL    *DevicePath
-  )
-{
-  EFI_DEVICE_PATH_PROTOCOL     *CheckDevicePath;
-
-  CheckDevicePath = DevicePath;
-  while (!IsDevicePathEnd (CheckDevicePath)) {
-    //
-    // Check device whether is hot plug device or not throught Device Path
-    // 
-    if ((DevicePathType (CheckDevicePath) == MESSAGING_DEVICE_PATH) &&
-        (DevicePathSubType (CheckDevicePath) == MSG_USB_DP ||
-         DevicePathSubType (CheckDevicePath) == MSG_USB_CLASS_DP ||
-         DevicePathSubType (CheckDevicePath) == MSG_USB_WWID_DP)) {
-      //
-      // If Device is USB device
-      //
-      return TRUE;
-    }
-    if ((DevicePathType (CheckDevicePath) == HARDWARE_DEVICE_PATH) &&
-        (DevicePathSubType (CheckDevicePath) == HW_PCCARD_DP)) {
-      //
-      // If Device is PCCard
-      //
-      return TRUE;
-    }
-  
-    CheckDevicePath = NextDevicePathNode (CheckDevicePath);
-  }
-
-  return FALSE;
-}
-
 /**
   Update ConOutDev and ErrOutDev variables to add the device path of
   GOP controller itself and the sibling controllers.
diff --git a/MdeModulePkg/Universal/Console/ConPlatformDxe/ConPlatform.h b/MdeModulePkg/Universal/Console/ConPlatformDxe/ConPlatform.h
index 6d853c1360..63e023facb 100644
--- a/MdeModulePkg/Universal/Console/ConPlatformDxe/ConPlatform.h
+++ b/MdeModulePkg/Universal/Console/ConPlatformDxe/ConPlatform.h
@@ -1,7 +1,7 @@
 /** @file
   Header file for Console Platfrom DXE Driver.
 
-Copyright (c) 2006 - 2017, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2006 - 2018, Intel Corporation. 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
@@ -21,6 +21,7 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
 #include <Protocol/DevicePath.h>
 #include <Protocol/SimpleTextIn.h>
 #include <Protocol/PciIo.h>
+#include <Protocol/UsbIo.h>
 #include <Protocol/GraphicsOutput.h>
 
 #include <Guid/GlobalVariable.h>
@@ -119,9 +120,8 @@ ConPlatformTextOutDriverBindingSupported (
   Start this driver on ControllerHandle by opening Simple Text Input Protocol,
   reading Device Path, and installing Console In Devcice GUID on ControllerHandle.
 
-  If this devcie is not one hot-plug devce, append its device path into the 
-  console environment variables ConInDev.
-  
+  Append its device path into the console environment variables ConInDev.
+
   @param  This                 Protocol instance pointer.
   @param  ControllerHandle     Handle of device to bind driver to
   @param  RemainingDevicePath  Optional parameter use to pick a specific child
@@ -147,9 +147,8 @@ ConPlatformTextInDriverBindingStart (
   reading Device Path, and installing Console Out Devcic GUID, Standard Error
   Device GUID on ControllerHandle.
 
-  If this devcie is not one hot-plug devce, append its device path into the 
-  console environment variables ConOutDev, StdErrDev.
-  
+  Append its device path into the console environment variables ConOutDev, ErrOutDev.
+
   @param  This                 Protocol instance pointer.
   @param  ControllerHandle     Handle of device to bind driver to
   @param  RemainingDevicePath  Optional parameter use to pick a specific child
@@ -294,23 +293,6 @@ ConPlatformUpdateDeviceVariable (
   IN  CONPLATFORM_VAR_OPERATION Operation
   );
 
-/**
-  Check if the device supports hot-plug through its device path.
-
-  This function could be updated to check more types of Hot Plug devices.
-  Currently, it checks USB and PCCard device.
-
-  @param  DevicePath            Pointer to device's device path.
-
-  @retval TRUE                  The devcie is a hot-plug device
-  @retval FALSE                 The devcie is not a hot-plug device.
-
-**/
-BOOLEAN
-IsHotPlugDevice (
-  IN  EFI_DEVICE_PATH_PROTOCOL    *DevicePath
-  );
-
 //
 // EFI Component Name Functions
 //
diff --git a/MdeModulePkg/Universal/Console/ConPlatformDxe/ConPlatformDxe.inf b/MdeModulePkg/Universal/Console/ConPlatformDxe/ConPlatformDxe.inf
index 1d404dfc6f..72522da53f 100644
--- a/MdeModulePkg/Universal/Console/ConPlatformDxe/ConPlatformDxe.inf
+++ b/MdeModulePkg/Universal/Console/ConPlatformDxe/ConPlatformDxe.inf
@@ -4,7 +4,7 @@
 # Console Platfrom DXE Driver that specifies whether device can be used as console
 # input/output device or error output device and update global variables accordingly.
 #
-# Copyright (c) 2006 - 2017, Intel Corporation. All rights reserved.<BR>
+# Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
 #
 #  This program and the accompanying materials
 #  are licensed and made available under the terms and conditions of the BSD License
@@ -94,6 +94,7 @@ [Protocols]
   gEfiSimpleTextOutProtocolGuid                 ## TO_START
   gEfiPciIoProtocolGuid                         ## SOMETIMES_CONSUMES
   gEfiGraphicsOutputProtocolGuid                ## SOMETIMES_CONSUMES
+  gEfiUsbIoProtocolGuid                         ## SOMETIMES_CONSUMES
 
 [UserExtensions.TianoCore."ExtraFiles"]
   ConPlatformDxeExtra.uni
\ No newline at end of file
-- 
2.16.1.windows.1



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