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/** @file
I2c Bus byte read/write functions.
Copyright (c) 2008, 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.
**/
#include <Protocol/PciIo.h>
/**
Read one byte data on I2C Bus.
Read one byte data from the slave device connectet to I2C Bus.
If Data is NULL, then ASSERT().
@param PciIo The pointer to PCI_IO_PROTOCOL.
@param DeviceAddress Slave device's address.
@param RegisterAddress The register address on slave device.
@param Data The pointer to returned data if EFI_SUCCESS returned.
@retval EFI_DEVICE_ERROR
@retval EFI_SUCCESS
**/
EFI_STATUS
EFIAPI
I2cReadByte (
EFI_PCI_IO_PROTOCOL *PciIo,
UINT8 DeviceAddress,
UINT8 RegisterAddress,
UINT8 *Data
);
/**
Write one byte data onto I2C Bus.
Write one byte data to the slave device connectet to I2C Bus.
If Data is NULL, then ASSERT().
@param PciIo The pointer to PCI_IO_PROTOCOL.
@param DeviceAddress Slave device's address.
@param RegisterAddress The register address on slave device.
@param Data The pointer to write data.
@retval EFI_DEVICE_ERROR
@retval EFI_SUCCESS
**/
EFI_STATUS
EFIAPI
I2cWriteByte (
EFI_PCI_IO_PROTOCOL *PciIo,
UINT8 DeviceAddress,
UINT8 RegisterAddress,
UINT8 *Data
);
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