| 1 | /** @file
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| 2 | I2c Bus byte read/write functions.
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| 3 |
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| 4 | Copyright (c) 2008 - 2009, Intel Corporation. All rights reserved.<BR>
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| 5 | This program and the accompanying materials
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| 6 | are licensed and made available under the terms and conditions of the BSD License
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| 7 | which accompanies this distribution. The full text of the license may be found at
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| 8 | http://opensource.org/licenses/bsd-license.php
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| 9 |
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| 10 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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| 11 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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| 12 |
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| 13 | **/
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| 14 |
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| 15 | #ifndef _CIRRUS_LOGIC_I2C_H_
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| 16 | #define _CIRRUS_LOGIC_I2C_H_
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| 17 |
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| 18 | #include <Protocol/PciIo.h>
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| 19 |
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| 20 | /**
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| 21 | Read one byte data on I2C Bus.
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| 22 |
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| 23 | Read one byte data from the slave device connectet to I2C Bus.
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| 24 | If Data is NULL, then ASSERT().
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| 25 |
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| 26 | @param PciIo The pointer to PCI_IO_PROTOCOL.
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| 27 | @param DeviceAddress Slave device's address.
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| 28 | @param RegisterAddress The register address on slave device.
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| 29 | @param Data The pointer to returned data if EFI_SUCCESS returned.
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| 30 |
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| 31 | @retval EFI_DEVICE_ERROR
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| 32 | @retval EFI_SUCCESS
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| 33 |
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| 34 | **/
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| 35 | EFI_STATUS
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| 36 | EFIAPI
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| 37 | I2cReadByte (
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| 38 | EFI_PCI_IO_PROTOCOL *PciIo,
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| 39 | UINT8 DeviceAddress,
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| 40 | UINT8 RegisterAddress,
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| 41 | UINT8 *Data
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| 42 | );
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| 43 |
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| 44 | /**
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| 45 | Write one byte data onto I2C Bus.
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| 46 |
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| 47 | Write one byte data to the slave device connectet to I2C Bus.
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| 48 | If Data is NULL, then ASSERT().
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| 49 |
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| 50 | @param PciIo The pointer to PCI_IO_PROTOCOL.
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| 51 | @param DeviceAddress Slave device's address.
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| 52 | @param RegisterAddress The register address on slave device.
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| 53 | @param Data The pointer to write data.
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| 54 |
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| 55 | @retval EFI_DEVICE_ERROR
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| 56 | @retval EFI_SUCCESS
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| 57 |
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| 58 | **/
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| 59 | EFI_STATUS
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| 60 | EFIAPI
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| 61 | I2cWriteByte (
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| 62 | EFI_PCI_IO_PROTOCOL *PciIo,
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| 63 | UINT8 DeviceAddress,
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| 64 | UINT8 RegisterAddress,
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| 65 | UINT8 *Data
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| 66 | );
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| 67 |
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| 68 | #endif
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