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 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 41 static 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 82 int 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 } 123 EXPORT_SYMBOL_GPL(parse_dai_link_info); 124 125 void 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 } 134 EXPORT_SYMBOL_GPL(clean_card_reference); 135