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