IntelFrameworkPkg/Library/PeiSmbusLibSmbusPpi/InternalSmbusLib.h

   1 /** @file
   2   Internal header file for Smbus library.
   3
   4 Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
   5 SPDX-License-Identifier: BSD-2-Clause-Patent
   6
   7 **/
   8
   9 #ifndef _INTERNAL_SMBUS_LIB_H_
  10 #define _INTERNAL_SMBUS_LIB_H_
  11
  12
  13 #include <FrameworkPei.h>
  14
  15 #include <Ppi/Smbus.h>
  16
  17 #include <Library/SmbusLib.h>
  18 #include <Library/DebugLib.h>
  19 #include <Library/PeiServicesLib.h>
  20 #include <Library/BaseMemoryLib.h>
  21 #include <Library/PeiServicesTablePointerLib.h>
  22
  23 //
  24 // Declaration for internal functions
  25 //
  26
  27 /**
  28   Gets Smbus PPIs.
  29
  30   This internal function retrieves Smbus PPI from PPI database.
  31
  32   @param  VOID
  33
  34   @return The pointer to Smbus PPI.
  35
  36 **/
  37 EFI_PEI_SMBUS_PPI *
  38 InternalGetSmbusPpi (
  39   VOID
  40   );
  41
  42 /**
  43   Executes an SMBus operation to an SMBus controller.
  44
  45   This function provides a standard way to execute Smbus script
  46   as defined in the SmBus Specification. The data can either be of
  47   the Length byte, word, or a block of data.
  48
  49   @param  SmbusOperation  Signifies which particular SMBus hardware protocol instance that it will use to
  50                           execute the SMBus transactions.
  51   @param  SmBusAddress    Address that encodes the SMBUS Slave Address,
  52                           SMBUS Command, SMBUS Data Length, and PEC.
  53   @param  Length          Signifies the number of bytes that this operation will do. The maximum number of
  54                           bytes can be revision specific and operation specific.
  55   @param  Buffer          Contains the value of data to execute to the SMBus slave device. Not all operations
  56                           require this argument. The length of this buffer is identified by Length.
  57   @param  Status          Return status for the executed command.
  58                           This is an optional parameter and may be NULL.
  59
  60   @return The actual number of bytes that are executed for this operation.
  61
  62 **/
  63 UINTN
  64 InternalSmBusExec (
  65   IN     EFI_SMBUS_OPERATION        SmbusOperation,
  66   IN     UINTN                      SmBusAddress,
  67   IN     UINTN                      Length,
  68   IN OUT VOID                       *Buffer,
  69      OUT RETURN_STATUS              *Status        OPTIONAL
  70   );
  71
  72 #endif