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
set_card_codec_info(struct snd_soc_card * card,struct device_node * sub_node,struct snd_soc_dai_link * dai_link)15 static 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: setting dummy.\n", dai_link->name);
26
27 dai_link->codecs = &snd_soc_dummy_dlc;
28 dai_link->num_codecs = 1;
29 dai_link->dynamic = 1;
30 return 0;
31 }
32
33 /* set card codec info */
34 ret = snd_soc_of_get_dai_link_codecs(dev, codec_node, dai_link);
35
36 of_node_put(codec_node);
37
38 if (ret < 0)
39 return dev_err_probe(dev, ret, "%s: codec dai not found\n",
40 dai_link->name);
41
42 return 0;
43 }
44
set_dailink_daifmt(struct snd_soc_card * card,struct device_node * sub_node,struct snd_soc_dai_link * dai_link)45 static int set_dailink_daifmt(struct snd_soc_card *card,
46 struct device_node *sub_node,
47 struct snd_soc_dai_link *dai_link)
48 {
49 unsigned int daifmt;
50 const char *str;
51 int ret;
52 struct {
53 char *name;
54 unsigned int val;
55 } of_clk_table[] = {
56 { "cpu", SND_SOC_DAIFMT_CBC_CFC },
57 { "codec", SND_SOC_DAIFMT_CBP_CFP },
58 };
59
60 daifmt = snd_soc_daifmt_parse_format(sub_node, NULL);
61 if (daifmt) {
62 dai_link->dai_fmt &= SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK;
63 dai_link->dai_fmt |= daifmt;
64 }
65
66 /*
67 * check "mediatek,clk-provider = xxx"
68 * SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK area
69 */
70 ret = of_property_read_string(sub_node, "mediatek,clk-provider", &str);
71 if (ret == 0) {
72 int i;
73
74 for (i = 0; i < ARRAY_SIZE(of_clk_table); i++) {
75 if (strcmp(str, of_clk_table[i].name) == 0) {
76 dai_link->dai_fmt &= ~SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK;
77 dai_link->dai_fmt |= of_clk_table[i].val;
78 break;
79 }
80 }
81 }
82
83 return 0;
84 }
85
parse_dai_link_info(struct snd_soc_card * card)86 int parse_dai_link_info(struct snd_soc_card *card)
87 {
88 struct device *dev = card->dev;
89 struct device_node *sub_node;
90 struct snd_soc_dai_link *dai_link;
91 const char *dai_link_name;
92 int ret, i;
93
94 /* Loop over all the dai link sub nodes */
95 for_each_available_child_of_node(dev->of_node, sub_node) {
96 if (of_property_read_string(sub_node, "link-name",
97 &dai_link_name)) {
98 of_node_put(sub_node);
99 return -EINVAL;
100 }
101
102 for_each_card_prelinks(card, i, dai_link) {
103 if (!strcmp(dai_link_name, dai_link->name))
104 break;
105 }
106
107 if (i >= card->num_links) {
108 of_node_put(sub_node);
109 return -EINVAL;
110 }
111
112 ret = set_card_codec_info(card, sub_node, dai_link);
113 if (ret < 0) {
114 of_node_put(sub_node);
115 return ret;
116 }
117
118 ret = set_dailink_daifmt(card, sub_node, dai_link);
119 if (ret < 0) {
120 of_node_put(sub_node);
121 return ret;
122 }
123 }
124
125 return 0;
126 }
127 EXPORT_SYMBOL_GPL(parse_dai_link_info);
128
clean_card_reference(struct snd_soc_card * card)129 void clean_card_reference(struct snd_soc_card *card)
130 {
131 struct snd_soc_dai_link *dai_link;
132 int i;
133
134 /* release codec reference gotten by set_card_codec_info */
135 for_each_card_prelinks(card, i, dai_link)
136 snd_soc_of_put_dai_link_codecs(dai_link);
137 }
138 EXPORT_SYMBOL_GPL(clean_card_reference);
139