diff options
Diffstat (limited to 'EDK/Foundation/Library/EdkIIGlueLib/Library/DxeSmbusLib/DxeSmbusLib.c')
-rw-r--r-- | EDK/Foundation/Library/EdkIIGlueLib/Library/DxeSmbusLib/DxeSmbusLib.c | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/EDK/Foundation/Library/EdkIIGlueLib/Library/DxeSmbusLib/DxeSmbusLib.c b/EDK/Foundation/Library/EdkIIGlueLib/Library/DxeSmbusLib/DxeSmbusLib.c new file mode 100644 index 0000000..8d5e10f --- /dev/null +++ b/EDK/Foundation/Library/EdkIIGlueLib/Library/DxeSmbusLib/DxeSmbusLib.c @@ -0,0 +1,107 @@ +/*++ + +Copyright (c) 2004 - 2006, Intel Corporation +All rights reserved. This program and the accompanying materials +are licensed and made available under the terms and conditions of the BSD License +which accompanies this distribution. The full text of the license may be found at +http://opensource.org/licenses/bsd-license.php + +THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, +WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. + + +Module Name: + + DxeSmbusLib.c + +Abstract: + + Dxe Smbus Lib internal functions + +--*/ + +#include "DxeSmbusLibInternal.h" + +// +// Globle varible to cache pointer to Smbus protocol. +// +STATIC EFI_SMBUS_HC_PROTOCOL *mSmbus = NULL; + +/** + The constructor function caches the pointer to Smbus protocol. + + The constructor function locates Smbus protocol from protocol database. + It will ASSERT() if that operation fails and it will always return EFI_SUCCESS. + + @param ImageHandle The firmware allocated handle for the EFI image. + @param SystemTable A pointer to the EFI System Table. + + @retval EFI_SUCCESS The constructor always returns EFI_SUCCESS. + +**/ +EFI_STATUS +EFIAPI +SmbusLibConstructor ( + IN EFI_HANDLE ImageHandle, + IN EFI_SYSTEM_TABLE *SystemTable + ) +{ + EFI_STATUS Status; + + Status = gBS->LocateProtocol (&gEfiSmbusProtocolGuid, NULL, (VOID**) &mSmbus); + ASSERT_EFI_ERROR (Status); + ASSERT (mSmbus != NULL); + + return Status; +} + +/** + 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 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 + ) +{ + RETURN_STATUS ReturnStatus; + EFI_SMBUS_DEVICE_ADDRESS SmbusDeviceAddress; + + SmbusDeviceAddress.SmbusDeviceAddress = SMBUS_LIB_SLAVE_ADDRESS (SmBusAddress); + + ReturnStatus = mSmbus->Execute ( + mSmbus, + SmbusDeviceAddress, + SMBUS_LIB_COMMAND (SmBusAddress), + SmbusOperation, + SMBUS_LIB_PEC (SmBusAddress), + &Length, + Buffer + ); + if (Status != NULL) { + *Status = ReturnStatus; + } + + return Length; +} |