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105 lines
3.6 KiB
C
105 lines
3.6 KiB
C
/** @file
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I2C Device Enumerate Protocol as defined in the PI 1.3 specification.
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This protocol supports the enumerations of device on the I2C bus.
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Copyright (c) 2013 - 2018, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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@par Revision Reference:
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This protocol is from PI Version 1.3.
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**/
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#ifndef __I2C_ENUMERATE_H__
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#define __I2C_ENUMERATE_H__
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#include <Pi/PiI2c.h>
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#define EFI_I2C_ENUMERATE_PROTOCOL_GUID { 0xda8cd7c4, 0x1c00, 0x49e2, { 0x80, 0x3e, 0x52, 0x14, 0xe7, 0x01, 0x89, 0x4c }}
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typedef struct _EFI_I2C_ENUMERATE_PROTOCOL EFI_I2C_ENUMERATE_PROTOCOL;
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/**
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Enumerate the I2C devices
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This function enables the caller to traverse the set of I2C devices
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on an I2C bus.
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@param[in] This The platform data for the next device on
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the I2C bus was returned successfully.
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@param[in, out] Device Pointer to a buffer containing an
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EFI_I2C_DEVICE structure. Enumeration is
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started by setting the initial EFI_I2C_DEVICE
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structure pointer to NULL. The buffer
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receives an EFI_I2C_DEVICE structure pointer
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to the next I2C device.
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@retval EFI_SUCCESS The platform data for the next device on
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the I2C bus was returned successfully.
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@retval EFI_INVALID_PARAMETER Device is NULL
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@retval EFI_NO_MAPPING *Device does not point to a valid
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EFI_I2C_DEVICE structure returned in a
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previous call Enumerate().
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_I2C_ENUMERATE_PROTOCOL_ENUMERATE) (
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IN CONST EFI_I2C_ENUMERATE_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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Get the requested I2C bus frequency for a specified bus configuration.
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This function returns the requested I2C bus clock frequency for the
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I2cBusConfiguration. This routine is provided for diagnostic purposes
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and is meant to be called after calling Enumerate to get the
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I2cBusConfiguration value.
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@param[in] This Pointer to an EFI_I2C_ENUMERATE_PROTOCOL
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structure.
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@param[in] I2cBusConfiguration I2C bus configuration to access the I2C
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device
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@param[out] *BusClockHertz Pointer to a buffer to receive the I2C
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bus clock frequency in Hertz
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@retval EFI_SUCCESS The I2C bus frequency was returned
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successfully.
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@retval EFI_INVALID_PARAMETER BusClockHertz was NULL
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@retval EFI_NO_MAPPING Invalid I2cBusConfiguration value
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_I2C_ENUMERATE_PROTOCOL_GET_BUS_FREQUENCY) (
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IN CONST EFI_I2C_ENUMERATE_PROTOCOL *This,
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IN UINTN I2cBusConfiguration,
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OUT UINTN *BusClockHertz
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);
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///
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/// I2C Enumerate protocol
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///
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struct _EFI_I2C_ENUMERATE_PROTOCOL {
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///
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/// Traverse the set of I2C devices on an I2C bus. This routine
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/// returns the next I2C device on an I2C bus.
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///
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EFI_I2C_ENUMERATE_PROTOCOL_ENUMERATE Enumerate;
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///
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/// Get the requested I2C bus frequency for a specified bus
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/// configuration.
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///
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EFI_I2C_ENUMERATE_PROTOCOL_GET_BUS_FREQUENCY GetBusFrequency;
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};
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///
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/// Reference to variable defined in the .DEC file
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///
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extern EFI_GUID gEfiI2cEnumerateProtocolGuid;
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#endif // __I2C_ENUMERATE_H__
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