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 return -EINVAL;
26
27 /* set card codec info */
28 ret = snd_soc_of_get_dai_link_codecs(dev, codec_node, dai_link);
29
30 of_node_put(codec_node);
31
32 if (ret < 0)
33 return dev_err_probe(dev, ret, "%s: codec dai not found\n",
34 dai_link->name);
35
36 return 0;
37 }
38
parse_dai_link_info(struct snd_soc_card * card)39 int parse_dai_link_info(struct snd_soc_card *card)
40 {
41 struct device *dev = card->dev;
42 struct device_node *sub_node;
43 struct snd_soc_dai_link *dai_link;
44 const char *dai_link_name;
45 int ret, i;
46
47 /* Loop over all the dai link sub nodes */
48 for_each_available_child_of_node(dev->of_node, sub_node) {
49 if (of_property_read_string(sub_node, "link-name",
50 &dai_link_name))
51 return -EINVAL;
52
53 for_each_card_prelinks(card, i, dai_link) {
54 if (!strcmp(dai_link_name, dai_link->name))
55 break;
56 }
57
58 if (i >= card->num_links)
59 return -EINVAL;
60
61 ret = set_card_codec_info(card, sub_node, dai_link);
62 if (ret < 0)
63 return ret;
64 }
65
66 return 0;
67 }
68 EXPORT_SYMBOL_GPL(parse_dai_link_info);
69
clean_card_reference(struct snd_soc_card * card)70 void clean_card_reference(struct snd_soc_card *card)
71 {
72 struct snd_soc_dai_link *dai_link;
73 int i;
74
75 /* release codec reference gotten by set_card_codec_info */
76 for_each_card_prelinks(card, i, dai_link)
77 snd_soc_of_put_dai_link_codecs(dai_link);
78 }
79 EXPORT_SYMBOL_GPL(clean_card_reference);
80