sound/soc/mediatek/common/mtk-soundcard-driver.c

   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
  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
  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
  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);