1// SPDX-License-Identifier: MIT
 2/*
 3 * Copyright © 2023 Intel Corporation
 4 */
 5
 6#include <drm/drm_edid.h>
 7#include <drm/drm_eld.h>
 8
 9#include "drm_internal.h"
10
11/**
12 * drm_eld_sad_get - get SAD from ELD to struct cea_sad
13 * @eld: ELD buffer
14 * @sad_index: SAD index
15 * @cta_sad: destination struct cea_sad
16 *
17 * @return: 0 on success, or negative on errors
18 */
19int drm_eld_sad_get(const u8 *eld, int sad_index, struct cea_sad *cta_sad)
20{
21	const u8 *sad;
22
23	if (sad_index >= drm_eld_sad_count(eld))
24		return -EINVAL;
25
26	sad = eld + DRM_ELD_CEA_SAD(drm_eld_mnl(eld), sad_index);
27
28	drm_edid_cta_sad_set(cta_sad, sad);
29
30	return 0;
31}
32EXPORT_SYMBOL(drm_eld_sad_get);
33
34/**
35 * drm_eld_sad_set - set SAD to ELD from struct cea_sad
36 * @eld: ELD buffer
37 * @sad_index: SAD index
38 * @cta_sad: source struct cea_sad
39 *
40 * @return: 0 on success, or negative on errors
41 */
42int drm_eld_sad_set(u8 *eld, int sad_index, const struct cea_sad *cta_sad)
43{
44	u8 *sad;
45
46	if (sad_index >= drm_eld_sad_count(eld))
47		return -EINVAL;
48
49	sad = eld + DRM_ELD_CEA_SAD(drm_eld_mnl(eld), sad_index);
50
51	drm_edid_cta_sad_get(cta_sad, sad);
52
53	return 0;
54}
55EXPORT_SYMBOL(drm_eld_sad_set);