1 files changed, 104 insertions, 0 deletions
diff --git a/Core/MdePkg/Library/DxeSmbusLib/DxeSmbusLib.c b/Core/MdePkg/Library/DxeSmbusLib/DxeSmbusLib.c
new file mode 100644
index 0000000000..985085c136
--- /dev/null
+++ b/Core/MdePkg/Library/DxeSmbusLib/DxeSmbusLib.c
@@ -0,0 +1,104 @@
+/** @file
+Implementation of SmBusLib class library for DXE phase.
+
+Copyright (c) 2006 - 2010, 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
+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 "InternalSmbusLib.h"
+
+
+//
+// Globle varible to cache pointer to Smbus protocol.
+//
+EFI_SMBUS_HC_PROTOCOL      *mSmbus = NULL;
+
+/**
+  The constructor function caches the pointer to Smbus protocol.
+
+  The constructor function locates Smbus protocol from protocol database.
+  It will ASSERT() if that operation fails and it will always return EFI_SUCCESS.
+
+  @param  ImageHandle   The firmware allocated handle for the EFI image.
+  @param  SystemTable   A pointer to the EFI System Table.
+
+  @retval EFI_SUCCESS   The constructor always returns EFI_SUCCESS.
+
+**/
+EFI_STATUS
+EFIAPI
+SmbusLibConstructor (
+  IN EFI_HANDLE                ImageHandle,
+  IN EFI_SYSTEM_TABLE          *SystemTable
+  )
+{
+  EFI_STATUS  Status;
+
+  Status = gBS->LocateProtocol (&gEfiSmbusHcProtocolGuid, NULL, (VOID**) &mSmbus);
+  ASSERT_EFI_ERROR (Status);
+  ASSERT (mSmbus != NULL);
+
+  return Status;
+}
+
+/**
+  Executes an SMBus operation to an SMBus controller.
+
+  This function provides a standard way to execute Smbus script
+  as defined in the SmBus Specification. The data can either be of
+  the Length byte, word, or a block of data.
+
+  @param  SmbusOperation  Signifies which particular SMBus hardware protocol instance 
+                          that it will use to execute the SMBus transactions.
+  @param  SmBusAddress    The address that encodes the SMBUS Slave Address,
+                          SMBUS Command, SMBUS Data Length, and PEC.
+  @param  Length          Signifies the number of bytes that this operation will do. 
+                          The maximum number of bytes can be revision specific 
+                          and operation specific.
+  @param  Buffer          Contains the value of data to execute to the SMBus slave 
+                          device. Not all operations require this argument. The 
+                          length of this buffer is identified by Length.
+  @param  Status          Return status for the executed command.
+                          This is an optional parameter and may be NULL.
+
+  @return The actual number of bytes that are executed for this operation.
+
+**/
+UINTN
+InternalSmBusExec (
+  IN     EFI_SMBUS_OPERATION        SmbusOperation,
+  IN     UINTN                      SmBusAddress,
+  IN     UINTN                      Length,
+  IN OUT VOID                       *Buffer,
+     OUT RETURN_STATUS              *Status        OPTIONAL
+  )
+{
+  RETURN_STATUS             ReturnStatus;
+  EFI_SMBUS_DEVICE_ADDRESS  SmbusDeviceAddress;
+
+  SmbusDeviceAddress.SmbusDeviceAddress = SMBUS_LIB_SLAVE_ADDRESS (SmBusAddress);
+
+  ReturnStatus = mSmbus->Execute (
+                           mSmbus,
+                           SmbusDeviceAddress,
+                           SMBUS_LIB_COMMAND (SmBusAddress),
+                           SmbusOperation,
+                           SMBUS_LIB_PEC (SmBusAddress),
+                           &Length,
+                           Buffer
+                           );
+  if (Status != NULL) {
+    *Status = ReturnStatus;
+  }
+
+  return Length;
+}