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/** @file
Copyright (c) 2008-2009, Apple Inc. All rights reserved.
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.
**/
#include <Uefi.h>
#include <TPS65950.h>
#include <Library/BaseMemoryLib.h>
#include <Library/DebugLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Protocol/EmbeddedExternalDevice.h>
#include <Protocol/SmbusHc.h>
EFI_SMBUS_HC_PROTOCOL *Smbus;
EFI_STATUS
Read (
IN EMBEDDED_EXTERNAL_DEVICE *This,
IN UINTN Register,
IN UINTN Length,
OUT VOID *Buffer
)
{
EFI_STATUS Status;
EFI_SMBUS_DEVICE_ADDRESS SlaveAddress;
UINT8 DeviceRegister;
UINTN DeviceRegisterLength = 1;
SlaveAddress.SmbusDeviceAddress = EXTERNAL_DEVICE_REGISTER_TO_SLAVE_ADDRESS(Register);
DeviceRegister = (UINT8)EXTERNAL_DEVICE_REGISTER_TO_REGISTER(Register);
//Write DeviceRegister.
Status = Smbus->Execute(Smbus, SlaveAddress, 0, EfiSmbusWriteBlock, FALSE, &DeviceRegisterLength, &DeviceRegister);
if (EFI_ERROR(Status)) {
return Status;
}
//Read Data
Status = Smbus->Execute(Smbus, SlaveAddress, 0, EfiSmbusReadBlock, FALSE, &Length, Buffer);
return Status;
}
EFI_STATUS
Write (
IN EMBEDDED_EXTERNAL_DEVICE *This,
IN UINTN Register,
IN UINTN Length,
IN VOID *Buffer
)
{
EFI_STATUS Status;
EFI_SMBUS_DEVICE_ADDRESS SlaveAddress;
UINT8 DeviceRegister;
UINTN DeviceBufferLength = Length + 1;
UINT8 *DeviceBuffer;
SlaveAddress.SmbusDeviceAddress = EXTERNAL_DEVICE_REGISTER_TO_SLAVE_ADDRESS(Register);
DeviceRegister = (UINT8)EXTERNAL_DEVICE_REGISTER_TO_REGISTER(Register);
//Prepare buffer for writing
DeviceBuffer = (UINT8 *)AllocatePool(DeviceBufferLength);
if (DeviceBuffer == NULL) {
Status = EFI_OUT_OF_RESOURCES;
goto exit;
}
//Set Device register followed by data to write.
DeviceBuffer[0] = DeviceRegister;
CopyMem(&DeviceBuffer[1], Buffer, Length);
//Write Data
Status = Smbus->Execute(Smbus, SlaveAddress, 0, EfiSmbusWriteBlock, FALSE, &DeviceBufferLength, DeviceBuffer);
if (EFI_ERROR(Status)) {
goto exit;
}
exit:
if (DeviceBuffer) {
FreePool(DeviceBuffer);
}
return Status;
}
EMBEDDED_EXTERNAL_DEVICE ExternalDevice = {
Read,
Write
};
EFI_STATUS
TPS65950Initialize (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
EFI_STATUS Status;
Status = gBS->LocateProtocol(&gEfiSmbusHcProtocolGuid, NULL, (VOID **)&Smbus);
ASSERT_EFI_ERROR(Status);
Status = gBS->InstallMultipleProtocolInterfaces(&ImageHandle, &gEmbeddedExternalDeviceProtocolGuid, &ExternalDevice, NULL);
return Status;
}
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