+++ /dev/null
-/** @file\r
-Implementation of SmBusLib class library for PEI phase.\r
-\r
-Copyright (c) 2006, Intel Corporation<BR>\r
-All rights reserved. This program and the accompanying materials \r
-are licensed and made available under the terms and conditions of the BSD License \r
-which accompanies this distribution. The full text of the license may be found at \r
-http://opensource.org/licenses/bsd-license.php \r
- \r
-THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, \r
-WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. \r
-\r
-\r
-Module Name: DxeSmbusLib.c\r
-\r
-**/\r
-\r
-#include "InternalSmbusLib.h"\r
-\r
-//\r
-// Globle varible to cache pointer to Smbus protocol.\r
-//\r
-STATIC EFI_SMBUS_HC_PROTOCOL *mSmbus = NULL; \r
-\r
-/**\r
- The constructor function caches the pointer to Smbus protocol.\r
- \r
- The constructor function locates Smbus protocol from protocol database.\r
- It will ASSERT() if that operation fails and it will always return EFI_SUCCESS. \r
-\r
- @param ImageHandle The firmware allocated handle for the EFI image.\r
- @param SystemTable A pointer to the EFI System Table.\r
- \r
- @retval EFI_SUCCESS The constructor always returns EFI_SUCCESS.\r
-\r
-**/\r
-EFI_STATUS\r
-EFIAPI\r
-SmbusLibConstructor (\r
- IN EFI_HANDLE ImageHandle,\r
- IN EFI_SYSTEM_TABLE *SystemTable\r
- )\r
-{\r
- EFI_STATUS Status;\r
- \r
- Status = gBS->LocateProtocol (&gEfiSmbusProtocolGuid, NULL, (VOID**) &mSmbus);\r
- ASSERT_EFI_ERROR (Status);\r
- ASSERT (mSmbus != NULL);\r
-\r
- return Status;\r
-}\r
-\r
-/**\r
- Executes an SMBus operation to an SMBus controller. \r
-\r
- This function provides a standard way to execute Smbus script\r
- as defined in the SmBus Specification. The data can either be of\r
- the Length byte, word, or a block of data.\r
-\r
- @param SmbusOperation Signifies which particular SMBus hardware protocol instance that it will use to\r
- execute the SMBus transactions.\r
- @param SmBusAddress Address that encodes the SMBUS Slave Address,\r
- SMBUS Command, SMBUS Data Length, and PEC.\r
- @param Length Signifies the number of bytes that this operation will do. The maximum number of\r
- bytes can be revision specific and operation specific.\r
- @param Buffer Contains the value of data to execute to the SMBus slave device. Not all operations\r
- require this argument. The length of this buffer is identified by Length.\r
- @param Status Return status for the executed command.\r
- This is an optional parameter and may be NULL.\r
-\r
- @return The actual number of bytes that are executed for this operation..\r
-\r
-**/\r
-UINTN\r
-InternalSmBusExec (\r
- IN EFI_SMBUS_OPERATION SmbusOperation,\r
- IN UINTN SmBusAddress,\r
- IN UINTN Length,\r
- IN OUT VOID *Buffer,\r
- OUT RETURN_STATUS *Status OPTIONAL\r
- )\r
-{\r
- RETURN_STATUS ReturnStatus;\r
- EFI_SMBUS_DEVICE_ADDRESS SmbusDeviceAddress;\r
-\r
- SmbusDeviceAddress.SmbusDeviceAddress = SMBUS_LIB_SLAVE_ADDRESS (SmBusAddress);\r
-\r
- ReturnStatus = mSmbus->Execute (\r
- mSmbus,\r
- SmbusDeviceAddress,\r
- SMBUS_LIB_COMMAND (SmBusAddress),\r
- SmbusOperation,\r
- SMBUS_LIB_PEC (SmBusAddress), \r
- &Length,\r
- Buffer\r
- );\r
- if (Status != NULL) {\r
- *Status = ReturnStatus;\r
- }\r
-\r
- return Length;\r
-}\r