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1/* SPDX-License-Identifier: MIT */
2/*
3 * Copyright (c) 2025 Intel Corporation
4 */
5
6#ifndef _INTEL_LB_MEI_INTERFACE_H_
7#define _INTEL_LB_MEI_INTERFACE_H_
8
9#include <linux/types.h>
10
11struct device;
12
13/**
14 * define INTEL_LB_FLAG_IS_PERSISTENT - Mark the payload as persistent
15 *
16 * This flag indicates that the late binding payload should be stored
17 * persistently in flash across warm resets.
18 */
19#define INTEL_LB_FLAG_IS_PERSISTENT BIT(0)
20
21/**
22 * enum intel_lb_type - enum to determine late binding payload type
23 * @INTEL_LB_TYPE_FAN_CONTROL: Fan controller configuration
24 */
25enum intel_lb_type {
26 INTEL_LB_TYPE_FAN_CONTROL = 1,
27};
28
29/**
30 * enum intel_lb_status - Status codes returned on late binding transmissions
31 * @INTEL_LB_STATUS_SUCCESS: Operation completed successfully
32 * @INTEL_LB_STATUS_4ID_MISMATCH: Mismatch in the expected 4ID (firmware identity/token)
33 * @INTEL_LB_STATUS_ARB_FAILURE: Arbitration failure (e.g. conflicting access or state)
34 * @INTEL_LB_STATUS_GENERAL_ERROR: General firmware error not covered by other codes
35 * @INTEL_LB_STATUS_INVALID_PARAMS: One or more input parameters are invalid
36 * @INTEL_LB_STATUS_INVALID_SIGNATURE: Payload has an invalid or untrusted signature
37 * @INTEL_LB_STATUS_INVALID_PAYLOAD: Payload contents are not accepted by firmware
38 * @INTEL_LB_STATUS_TIMEOUT: Operation timed out before completion
39 */
40enum intel_lb_status {
41 INTEL_LB_STATUS_SUCCESS = 0,
42 INTEL_LB_STATUS_4ID_MISMATCH = 1,
43 INTEL_LB_STATUS_ARB_FAILURE = 2,
44 INTEL_LB_STATUS_GENERAL_ERROR = 3,
45 INTEL_LB_STATUS_INVALID_PARAMS = 4,
46 INTEL_LB_STATUS_INVALID_SIGNATURE = 5,
47 INTEL_LB_STATUS_INVALID_PAYLOAD = 6,
48 INTEL_LB_STATUS_TIMEOUT = 7,
49};
50
51/**
52 * struct intel_lb_component_ops - Ops for late binding services
53 */
54struct intel_lb_component_ops {
55 /**
56 * push_payload - Sends a payload to the authentication firmware
57 * @dev: Device struct corresponding to the mei device
58 * @type: Payload type (see &enum intel_lb_type)
59 * @flags: Payload flags bitmap (e.g. %INTEL_LB_FLAGS_IS_PERSISTENT)
60 * @payload: Pointer to payload buffer
61 * @payload_size: Payload buffer size in bytes
62 *
63 * Return: 0 success, negative errno value on transport failure,
64 * positive status returned by firmware
65 */
66 int (*push_payload)(struct device *dev, u32 type, u32 flags,
67 const void *payload, size_t payload_size);
68};
69
70#endif /* _INTEL_LB_MEI_INTERFACE_H_ */