mirror of https://github.com/acidanthera/audk.git
100 lines
3.7 KiB
C
100 lines
3.7 KiB
C
/** @file
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Implementation of SmBusLib class library for PEI phase.
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Copyright (c) 2006, Intel Corporation<BR>
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All rights reserved. This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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Module Name: PeiSmbusLib.c
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**/
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#include "InternalSmbusLib.h"
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/**
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Gets Smbus PPIs.
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This internal function retrieves Smbus PPI from PPI database.
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@param PeiServices An indirect pointer to the EFI_PEI_SERVICES published by the PEI Foundation.
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@return The pointer to Smbus PPI.
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**/
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EFI_PEI_SMBUS_PPI *
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InternalGetSmbusPpi (
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EFI_PEI_SERVICES **PeiServices
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)
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{
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EFI_STATUS Status;
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EFI_PEI_SMBUS_PPI *SmbusPpi;
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Status = (*PeiServices)->LocatePpi (PeiServices, &gEfiPeiSmbusPpiGuid, 0, NULL, (VOID **) &SmbusPpi);
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ASSERT_EFI_ERROR (Status);
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ASSERT (SmbusPpi != NULL);
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return SmbusPpi;
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}
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/**
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Executes an SMBus operation to an SMBus controller.
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This function provides a standard way to execute Smbus script
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as defined in the SmBus Specification. The data can either be of
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the Length byte, word, or a block of data.
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@param SmbusOperation Signifies which particular SMBus hardware protocol instance that it will use to
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execute the SMBus transactions.
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@param SmBusAddress Address that encodes the SMBUS Slave Address,
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SMBUS Command, SMBUS Data Length, and PEC.
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@param Length Signifies the number of bytes that this operation will do. The maximum number of
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bytes can be revision specific and operation specific.
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@param Buffer Contains the value of data to execute to the SMBus slave device. Not all operations
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require this argument. The length of this buffer is identified by Length.
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@param Status Return status for the executed command.
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This is an optional parameter and may be NULL.
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@return The actual number of bytes that are executed for this operation..
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**/
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UINTN
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InternalSmBusExec (
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IN EFI_SMBUS_OPERATION SmbusOperation,
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IN UINTN SmBusAddress,
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IN UINTN Length,
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IN OUT VOID *Buffer,
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OUT RETURN_STATUS *Status OPTIONAL
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)
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{
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EFI_PEI_SMBUS_PPI *SmbusPpi;
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EFI_PEI_SERVICES **PeiServices;
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RETURN_STATUS ReturnStatus;
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EFI_SMBUS_DEVICE_ADDRESS SmbusDeviceAddress;
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PeiServices = GetPeiServicesTablePointer ();
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SmbusPpi = InternalGetSmbusPpi (PeiServices);
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SmbusDeviceAddress.SmbusDeviceAddress = SMBUS_LIB_SLAVE_ADDRESS (SmBusAddress);
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ReturnStatus = SmbusPpi->Execute (
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PeiServices,
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SmbusPpi,
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SmbusDeviceAddress,
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SMBUS_LIB_COMMAND (SmBusAddress),
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SmbusOperation,
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SMBUS_LIB_PEC (SmBusAddress),
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&Length,
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Buffer
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);
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if (Status != NULL) {
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*Status = ReturnStatus;
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}
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return Length;
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}
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