1 files changed, 95 insertions, 0 deletions
diff --git a/MdePkg/Library/PeiSmbusLibSmbus2Ppi/PeiSmbusLib.c b/MdePkg/Library/PeiSmbusLibSmbus2Ppi/PeiSmbusLib.c
new file mode 100644
index 000000000000..035c3eb88427
--- /dev/null
+++ b/MdePkg/Library/PeiSmbusLibSmbus2Ppi/PeiSmbusLib.c
@@ -0,0 +1,95 @@
+/** @file
+Implementation of SmBusLib class library for PEI 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"
+
+/**
+  Gets Smbus PPIs.
+
+  This internal function retrieves Smbus PPI from PPI database.
+
+  @param  VOID
+
+  @return The pointer to Smbus PPI.
+
+**/
+EFI_PEI_SMBUS2_PPI *
+InternalGetSmbusPpi (
+  VOID
+  )
+{
+  EFI_STATUS            Status;
+  EFI_PEI_SMBUS2_PPI     *SmbusPpi;
+
+  Status = PeiServicesLocatePpi (&gEfiPeiSmbus2PpiGuid, 0, NULL, (VOID **) &SmbusPpi);
+  ASSERT_EFI_ERROR (Status);
+  ASSERT (SmbusPpi != NULL);
+
+  return SmbusPpi;
+}
+
+/**
+  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
+  )
+{
+  EFI_PEI_SMBUS2_PPI        *SmbusPpi;
+  RETURN_STATUS             ReturnStatus;
+  EFI_SMBUS_DEVICE_ADDRESS  SmbusDeviceAddress;
+
+  SmbusPpi    = InternalGetSmbusPpi ();
+  SmbusDeviceAddress.SmbusDeviceAddress = SMBUS_LIB_SLAVE_ADDRESS (SmBusAddress);
+
+  ReturnStatus = SmbusPpi->Execute (
+                             SmbusPpi,
+                             SmbusDeviceAddress,
+                             SMBUS_LIB_COMMAND (SmBusAddress),
+                             SmbusOperation,
+                             SMBUS_LIB_PEC (SmBusAddress),
+                             &Length,
+                             Buffer
+                             );
+  if (Status != NULL) {
+    *Status = ReturnStatus;
+  }
+
+  return Length;
+}