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