1// SPDX-License-Identifier: GPL-2.0
2/*
3 * mtk-soundcard-driver.c  --  MediaTek soundcard driver common
4 *
5 * Copyright (c) 2022 MediaTek Inc.
6 * Author: Trevor Wu <trevor.wu@mediatek.com>
7 */
8
9#include <linux/module.h>
10#include <linux/of.h>
11#include <sound/soc.h>
12
13#include "mtk-soundcard-driver.h"
14
15static int set_card_codec_info(struct snd_soc_card *card,
16			       struct device_node *sub_node,
17			       struct snd_soc_dai_link *dai_link)
18{
19	struct device *dev = card->dev;
20	struct device_node *codec_node;
21	int ret;
22
23	codec_node = of_get_child_by_name(sub_node, "codec");
24	if (!codec_node) {
25		dev_dbg(dev, "%s no specified codec\n", dai_link->name);
26		return 0;
27	}
28
29	/* set card codec info */
30	ret = snd_soc_of_get_dai_link_codecs(dev, codec_node, dai_link);
31
32	of_node_put(codec_node);
33
34	if (ret < 0)
35		return dev_err_probe(dev, ret, "%s: codec dai not found\n",
36				     dai_link->name);
37
38	return 0;
39}
40
41static int set_dailink_daifmt(struct snd_soc_card *card,
42			      struct device_node *sub_node,
43			      struct snd_soc_dai_link *dai_link)
44{
45	unsigned int daifmt;
46	const char *str;
47	int ret;
48	struct {
49		char *name;
50		unsigned int val;
51	} of_clk_table[] = {
52		{ "cpu",	SND_SOC_DAIFMT_CBC_CFC },
53		{ "codec",	SND_SOC_DAIFMT_CBP_CFP },
54	};
55
56	daifmt = snd_soc_daifmt_parse_format(sub_node, NULL);
57	if (daifmt) {
58		dai_link->dai_fmt &= SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK;
59		dai_link->dai_fmt |= daifmt;
60	}
61
62	/*
63	 * check "mediatek,clk-provider = xxx"
64	 * SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK area
65	 */
66	ret = of_property_read_string(sub_node, "mediatek,clk-provider", &str);
67	if (ret == 0) {
68		int i;
69
70		for (i = 0; i < ARRAY_SIZE(of_clk_table); i++) {
71			if (strcmp(str, of_clk_table[i].name) == 0) {
72				dai_link->dai_fmt &= ~SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK;
73				dai_link->dai_fmt |= of_clk_table[i].val;
74				break;
75			}
76		}
77	}
78
79	return 0;
80}
81
82int parse_dai_link_info(struct snd_soc_card *card)
83{
84	struct device *dev = card->dev;
85	struct device_node *sub_node;
86	struct snd_soc_dai_link *dai_link;
87	const char *dai_link_name;
88	int ret, i;
89
90	/* Loop over all the dai link sub nodes */
91	for_each_available_child_of_node(dev->of_node, sub_node) {
92		if (of_property_read_string(sub_node, "link-name",
93					    &dai_link_name)) {
94			of_node_put(sub_node);
95			return -EINVAL;
96		}
97
98		for_each_card_prelinks(card, i, dai_link) {
99			if (!strcmp(dai_link_name, dai_link->name))
100				break;
101		}
102
103		if (i >= card->num_links) {
104			of_node_put(sub_node);
105			return -EINVAL;
106		}
107
108		ret = set_card_codec_info(card, sub_node, dai_link);
109		if (ret < 0) {
110			of_node_put(sub_node);
111			return ret;
112		}
113
114		ret = set_dailink_daifmt(card, sub_node, dai_link);
115		if (ret < 0) {
116			of_node_put(sub_node);
117			return ret;
118		}
119	}
120
121	return 0;
122}
123EXPORT_SYMBOL_GPL(parse_dai_link_info);
124
125void clean_card_reference(struct snd_soc_card *card)
126{
127	struct snd_soc_dai_link *dai_link;
128	int i;
129
130	/* release codec reference gotten by set_card_codec_info */
131	for_each_card_prelinks(card, i, dai_link)
132		snd_soc_of_put_dai_link_codecs(dai_link);
133}
134EXPORT_SYMBOL_GPL(clean_card_reference);
135