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99 lines
3.2 KiB
C
99 lines
3.2 KiB
C
/** @file
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Implementation of SmBusLib class library for DXE phase.
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Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include "InternalSmbusLib.h"
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//
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// Globle varible to cache pointer to Smbus protocol.
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//
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EFI_SMBUS_HC_PROTOCOL *mSmbus = NULL;
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/**
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The constructor function caches the pointer to Smbus protocol.
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The constructor function locates Smbus protocol from protocol database.
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It will ASSERT() if that operation fails and it will always return EFI_SUCCESS.
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@param ImageHandle The firmware allocated handle for the EFI image.
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@param SystemTable A pointer to the EFI System Table.
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@retval EFI_SUCCESS The constructor always returns EFI_SUCCESS.
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**/
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EFI_STATUS
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EFIAPI
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SmbusLibConstructor (
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IN EFI_HANDLE ImageHandle,
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IN EFI_SYSTEM_TABLE *SystemTable
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)
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{
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EFI_STATUS Status;
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Status = gBS->LocateProtocol (&gEfiSmbusHcProtocolGuid, NULL, (VOID**) &mSmbus);
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ASSERT_EFI_ERROR (Status);
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ASSERT (mSmbus != NULL);
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return Status;
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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
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that it will use to execute the SMBus transactions.
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@param SmBusAddress The 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.
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The maximum number of bytes can be revision specific
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and operation specific.
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@param Buffer Contains the value of data to execute to the SMBus slave
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device. Not all operations require this argument. The
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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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RETURN_STATUS ReturnStatus;
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EFI_SMBUS_DEVICE_ADDRESS SmbusDeviceAddress;
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SmbusDeviceAddress.SmbusDeviceAddress = SMBUS_LIB_SLAVE_ADDRESS (SmBusAddress);
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ReturnStatus = mSmbus->Execute (
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mSmbus,
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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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