2014-01-22 09:39:50 +01:00
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/** @file
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I2c Bus byte read/write functions.
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Copyright (c) 2008 - 2009, Intel Corporation. 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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2009-04-15 05:36:35 +02:00
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**/
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#ifndef _CIRRUS_LOGIC_I2C_H_
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#define _CIRRUS_LOGIC_I2C_H_
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#include <Protocol/PciIo.h>
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/**
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Read one byte data on I2C Bus.
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Read one byte data from the slave device connectet to I2C Bus.
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If Data is NULL, then ASSERT().
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@param PciIo The pointer to PCI_IO_PROTOCOL.
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@param DeviceAddress Slave device's address.
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@param RegisterAddress The register address on slave device.
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@param Data The pointer to returned data if EFI_SUCCESS returned.
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@retval EFI_DEVICE_ERROR
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@retval EFI_SUCCESS
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**/
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EFI_STATUS
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EFIAPI
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I2cReadByte (
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EFI_PCI_IO_PROTOCOL *PciIo,
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UINT8 DeviceAddress,
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UINT8 RegisterAddress,
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UINT8 *Data
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);
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/**
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Write one byte data onto I2C Bus.
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Write one byte data to the slave device connectet to I2C Bus.
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If Data is NULL, then ASSERT().
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@param PciIo The pointer to PCI_IO_PROTOCOL.
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@param DeviceAddress Slave device's address.
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@param RegisterAddress The register address on slave device.
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@param Data The pointer to write data.
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@retval EFI_DEVICE_ERROR
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@retval EFI_SUCCESS
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**/
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EFI_STATUS
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EFIAPI
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I2cWriteByte (
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EFI_PCI_IO_PROTOCOL *PciIo,
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UINT8 DeviceAddress,
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UINT8 RegisterAddress,
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UINT8 *Data
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);
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#endif
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