mirror of
https://github.com/acidanthera/audk.git
synced 2025-08-24 02:58:10 +02:00
9344f09215
https://bugzilla.tianocore.org/show_bug.cgi?id=1373 Replace BSD 2-Clause License with BSD+Patent License. This change is based on the following emails: https://lists.01.org/pipermail/edk2-devel/2019-February/036260.html https://lists.01.org/pipermail/edk2-devel/2018-October/030385.html RFCs with detailed process for the license change: V3: https://lists.01.org/pipermail/edk2-devel/2019-March/038116.html V2: https://lists.01.org/pipermail/edk2-devel/2019-March/037669.html V1: https://lists.01.org/pipermail/edk2-devel/2019-March/037500.html Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com> Reviewed-by: Liming Gao <liming.gao@intel.com>
90 lines
2.9 KiB
C
90 lines
2.9 KiB
C
/** @file
|
|
Implementation of SmBusLib class library for PEI phase.
|
|
|
|
Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
|
|
SPDX-License-Identifier: BSD-2-Clause-Patent
|
|
|
|
**/
|
|
|
|
#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;
|
|
}
|