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); 80