sound/soc/loongson/loongson_card.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 //
   3 // Loongson ASoC Audio Machine driver
   4 //
   5 // Copyright (C) 2023 Loongson Technology Corporation Limited
   6 // Author: Yingkun Meng <mengyingkun@loongson.cn>
   7 //
   8
   9 #include <linux/module.h>
  10 #include <sound/soc.h>
  11 #include <sound/soc-acpi.h>
  12 #include <linux/acpi.h>
  13 #include <linux/pci.h>
  14 #include <sound/pcm_params.h>
  15
  16 static char codec_name[SND_ACPI_I2C_ID_LEN];
  17
  18 struct loongson_card_data {
  19         struct snd_soc_card snd_card;
  20         unsigned int mclk_fs;
  21 };
  22
  23 static int loongson_card_hw_params(struct snd_pcm_substream *substream,
  24                                    struct snd_pcm_hw_params *params)
  25 {
  26         struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
  27         struct loongson_card_data *ls_card = snd_soc_card_get_drvdata(rtd->card);
  28         struct snd_soc_dai *codec_dai = snd_soc_rtd_to_codec(rtd, 0);
  29         struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(rtd, 0);
  30         int ret, mclk;
  31
  32         if (!ls_card->mclk_fs)
  33                 return 0;
  34
  35         mclk = ls_card->mclk_fs * params_rate(params);
  36         ret = snd_soc_dai_set_sysclk(cpu_dai, 0, mclk, SND_SOC_CLOCK_OUT);
  37         if (ret < 0) {
  38                 dev_err(codec_dai->dev, "cpu_dai clock not set\n");
  39                 return ret;
  40         }
  41
  42         ret = snd_soc_dai_set_sysclk(codec_dai, 0, mclk, SND_SOC_CLOCK_IN);
  43         if (ret < 0) {
  44                 dev_err(codec_dai->dev, "codec_dai clock not set\n");
  45                 return ret;
  46         }
  47
  48         return 0;
  49 }
  50
  51 static const struct snd_soc_ops loongson_ops = {
  52         .hw_params = loongson_card_hw_params,
  53 };
  54
  55 SND_SOC_DAILINK_DEFS(analog,
  56         DAILINK_COMP_ARRAY(COMP_CPU("loongson-i2s")),
  57         DAILINK_COMP_ARRAY(COMP_EMPTY()),
  58         DAILINK_COMP_ARRAY(COMP_EMPTY()));
  59
  60 static struct snd_soc_dai_link loongson_dai_links[] = {
  61         {
  62                 .name = "Loongson Audio Port",
  63                 .stream_name = "Loongson Audio",
  64                 .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_IB_NF
  65                         | SND_SOC_DAIFMT_CBC_CFC,
  66                 SND_SOC_DAILINK_REG(analog),
  67                 .ops = &loongson_ops,
  68         },
  69 };
  70
  71 static struct acpi_device *loongson_card_acpi_find_device(struct snd_soc_card *card,
  72                                                           const char *name)
  73 {
  74         struct fwnode_handle *fwnode = card->dev->fwnode;
  75         struct fwnode_reference_args args;
  76         int status;
  77
  78         memset(&args, 0, sizeof(args));
  79         status = acpi_node_get_property_reference(fwnode, name, 0, &args);
  80         if (status || !is_acpi_device_node(args.fwnode)) {
  81                 dev_err(card->dev, "No matching phy in ACPI table\n");
  82                 return NULL;
  83         }
  84
  85         return to_acpi_device_node(args.fwnode);
  86 }
  87
  88 static int loongson_card_parse_acpi(struct loongson_card_data *data)
  89 {
  90         struct snd_soc_card *card = &data->snd_card;
  91         const char *codec_dai_name;
  92         struct acpi_device *adev;
  93         struct device *phy_dev;
  94         int i;
  95
  96         /* fixup platform name based on reference node */
  97         adev = loongson_card_acpi_find_device(card, "cpu");
  98         if (!adev)
  99                 return -ENOENT;
 100
 101         phy_dev = acpi_get_first_physical_node(adev);
 102         if (!phy_dev)
 103                 return -EPROBE_DEFER;
 104
 105         /* fixup codec name based on reference node */
 106         adev = loongson_card_acpi_find_device(card, "codec");
 107         if (!adev)
 108                 return -ENOENT;
 109         snprintf(codec_name, sizeof(codec_name), "i2c-%s", acpi_dev_name(adev));
 110
 111         device_property_read_string(card->dev, "codec-dai-name", &codec_dai_name);
 112
 113         for (i = 0; i < card->num_links; i++) {
 114                 loongson_dai_links[i].platforms->name = dev_name(phy_dev);
 115                 loongson_dai_links[i].codecs->name = codec_name;
 116                 loongson_dai_links[i].codecs->dai_name = codec_dai_name;
 117         }
 118
 119         return 0;
 120 }
 121
 122 static int loongson_card_parse_of(struct loongson_card_data *data)
 123 {
 124         struct device_node *cpu, *codec;
 125         struct snd_soc_card *card = &data->snd_card;
 126         struct device *dev = card->dev;
 127         int ret, i;
 128
 129         cpu = of_get_child_by_name(dev->of_node, "cpu");
 130         if (!cpu) {
 131                 dev_err(dev, "platform property missing or invalid\n");
 132                 return -EINVAL;
 133         }
 134         codec = of_get_child_by_name(dev->of_node, "codec");
 135         if (!codec) {
 136                 dev_err(dev, "audio-codec property missing or invalid\n");
 137                 of_node_put(cpu);
 138                 return -EINVAL;
 139         }
 140
 141         for (i = 0; i < card->num_links; i++) {
 142                 ret = snd_soc_of_get_dlc(cpu, NULL, loongson_dai_links[i].cpus, 0);
 143                 if (ret < 0) {
 144                         dev_err(dev, "getting cpu dlc error (%d)\n", ret);
 145                         goto err;
 146                 }
 147                 loongson_dai_links[i].platforms->of_node = loongson_dai_links[i].cpus->of_node;
 148
 149                 ret = snd_soc_of_get_dlc(codec, NULL, loongson_dai_links[i].codecs, 0);
 150                 if (ret < 0) {
 151                         dev_err(dev, "getting codec dlc error (%d)\n", ret);
 152                         goto err;
 153                 }
 154         }
 155
 156         of_node_put(cpu);
 157         of_node_put(codec);
 158
 159         return 0;
 160
 161 err:
 162         of_node_put(cpu);
 163         of_node_put(codec);
 164         return ret;
 165 }
 166
 167 static int loongson_asoc_card_probe(struct platform_device *pdev)
 168 {
 169         struct loongson_card_data *ls_priv;
 170         struct device *dev = &pdev->dev;
 171         struct snd_soc_card *card;
 172         int ret;
 173
 174         ls_priv = devm_kzalloc(dev, sizeof(*ls_priv), GFP_KERNEL);
 175         if (!ls_priv)
 176                 return -ENOMEM;
 177
 178         card = &ls_priv->snd_card;
 179
 180         card->dev = dev;
 181         card->owner = THIS_MODULE;
 182         card->dai_link = loongson_dai_links;
 183         card->num_links = ARRAY_SIZE(loongson_dai_links);
 184         snd_soc_card_set_drvdata(card, ls_priv);
 185
 186         ret = device_property_read_string(dev, "model", &card->name);
 187         if (ret)
 188                 return dev_err_probe(dev, ret, "Error parsing card name\n");
 189
 190         ret = device_property_read_u32(dev, "mclk-fs", &ls_priv->mclk_fs);
 191         if (ret)
 192                 return dev_err_probe(dev, ret, "Error parsing mclk-fs\n");
 193
 194         ret = has_acpi_companion(dev) ? loongson_card_parse_acpi(ls_priv)
 195                                       : loongson_card_parse_of(ls_priv);
 196         if (ret)
 197                 return dev_err_probe(dev, ret, "Error parsing acpi/of properties\n");
 198
 199         return devm_snd_soc_register_card(dev, card);
 200 }
 201
 202 static const struct of_device_id loongson_asoc_dt_ids[] = {
 203         { .compatible = "loongson,ls-audio-card" },
 204         { /* sentinel */ },
 205 };
 206 MODULE_DEVICE_TABLE(of, loongson_asoc_dt_ids);
 207
 208 static struct platform_driver loongson_audio_driver = {
 209         .probe = loongson_asoc_card_probe,
 210         .driver = {
 211                 .name = "loongson-asoc-card",
 212                 .pm = &snd_soc_pm_ops,
 213                 .of_match_table = loongson_asoc_dt_ids,
 214         },
 215 };
 216 module_platform_driver(loongson_audio_driver);
 217
 218 MODULE_DESCRIPTION("Loongson ASoc Sound Card driver");
 219 MODULE_AUTHOR("Loongson Technology Corporation Limited");
 220 MODULE_LICENSE("GPL");