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/*++
Copyright (c) 2004 - 2014, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#ifndef __I2C_ACPI_H__
#define __I2C_ACPI_H__
#include <Protocol/DevicePath.h>
//
// I2C ACPI protocol
//
typedef struct _EFI_I2C_ACPI_PROTOCOL EFI_I2C_ACPI_PROTOCOL;
//
// I2C device description
//
// This structure provides the platform specific information which
// describes an I2C device.
//
typedef struct {
//
// Hardware revision - ACPI _HRV value
//
UINT32 HardwareRevision;
//
// Device path node for the I2C device.
//
CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath;
//
// I2C bus configuration for the I2C device.
//
UINT32 I2cBusConfiguration;
//
// Number of slave addresses for the I2C device.
//
UINT32 SlaveAddressCount;
//
// Address of the array of slave addresses for the I2C device.
//
CONST UINT32 *SlaveAddressArray;
}EFI_I2C_DEVICE;
/**
Enumerate the I2C devices
This routine must be called at or below TPL_NOTIFY.
This function walks the platform specific data to enumerates the
I2C devices on an I2C bus.
@param[in] This Address of an EFI_I2C_ENUM_PROTOCOL
structure.
@param[in, out] Device Buffer containing the address of an
EFI_I2C_DEVICE structure. Enumeration
is started by setting the initial
EFI_I2C_DEVICE structure address to NULL.
The buffer receives an EFI_I2C_DEVICE
structure address for the next I2C device.
@retval EFI_SUCCESS The platform data for the next device
on the I2C bus was returned successfully.
@retval EFI_INVALID_PARAMETER NextDevice was NULL
@retval EFI_NO_MAPPING PreviousDevice does not point to a valid
EFI_I2C_DEVICE structure.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_I2C_ACPI_ENUMERATE) (
IN CONST EFI_I2C_ACPI_PROTOCOL *This,
IN OUT CONST EFI_I2C_DEVICE **Device
);
//
// I2C device description
//
// This structure provides the platform specific information which
// describes an I2C device.
//
struct _EFI_I2C_ACPI_PROTOCOL {
//
// Walk the platform's list of I2C devices on the bus. This
// routine returns the next I2C device in the platform's list
// for this I2C bus.
//
EFI_I2C_ACPI_ENUMERATE Enumerate;
};
//
// Variable containing the GUID for the I2C device enumeration protocol
//
extern EFI_GUID gEfiI2cAcpiProtocolGuid;
#endif // __I2C_ACPI_H__
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