sound/soc/generic/simple-card.c

   1 /*
   2  * ASoC simple sound card support
   3  *
   4  * Copyright (C) 2012 Renesas Solutions Corp.
   5  * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11 #include <linux/clk.h>
  12 #include <linux/device.h>
  13 #include <linux/module.h>
  14 #include <linux/of.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/string.h>
  17 #include <sound/simple_card.h>
  18 #include <sound/soc-dai.h>
  19 #include <sound/soc.h>
  20
  21 struct simple_card_data {
  22         struct snd_soc_card snd_card;
  23         unsigned int daifmt;
  24         struct asoc_simple_dai cpu_dai;
  25         struct asoc_simple_dai codec_dai;
  26         struct snd_soc_dai_link snd_link;
  27 };
  28
  29 static int __asoc_simple_card_dai_init(struct snd_soc_dai *dai,
  30                                        struct asoc_simple_dai *set)
  31 {
  32         int ret;
  33
  34         if (set->fmt) {
  35                 ret = snd_soc_dai_set_fmt(dai, set->fmt);
  36                 if (ret && ret != -ENOTSUPP) {
  37                         dev_err(dai->dev, "simple-card: set_fmt error\n");
  38                         goto err;
  39                 }
  40         }
  41
  42         if (set->sysclk) {
  43                 ret = snd_soc_dai_set_sysclk(dai, 0, set->sysclk, 0);
  44                 if (ret && ret != -ENOTSUPP) {
  45                         dev_err(dai->dev, "simple-card: set_sysclk error\n");
  46                         goto err;
  47                 }
  48         }
  49
  50         if (set->slots) {
  51                 ret = snd_soc_dai_set_tdm_slot(dai, 0, 0,
  52                                                 set->slots,
  53                                                 set->slot_width);
  54                 if (ret && ret != -ENOTSUPP) {
  55                         dev_err(dai->dev, "simple-card: set_tdm_slot error\n");
  56                         goto err;
  57                 }
  58         }
  59
  60         ret = 0;
  61
  62 err:
  63         return ret;
  64 }
  65
  66 static int asoc_simple_card_dai_init(struct snd_soc_pcm_runtime *rtd)
  67 {
  68         struct simple_card_data *priv =
  69                                 snd_soc_card_get_drvdata(rtd->card);
  70         struct snd_soc_dai *codec = rtd->codec_dai;
  71         struct snd_soc_dai *cpu = rtd->cpu_dai;
  72         int ret;
  73
  74         ret = __asoc_simple_card_dai_init(codec, &priv->codec_dai);
  75         if (ret < 0)
  76                 return ret;
  77
  78         ret = __asoc_simple_card_dai_init(cpu, &priv->cpu_dai);
  79         if (ret < 0)
  80                 return ret;
  81
  82         return 0;
  83 }
  84
  85 static int
  86 asoc_simple_card_sub_parse_of(struct device_node *np,
  87                               unsigned int daifmt,
  88                               struct asoc_simple_dai *dai,
  89                               const struct device_node **p_node,
  90                               const char **name)
  91 {
  92         struct device_node *node;
  93         struct clk *clk;
  94         int ret;
  95
  96         /*
  97          * get node via "sound-dai = <&phandle port>"
  98          * it will be used as xxx_of_node on soc_bind_dai_link()
  99          */
 100         node = of_parse_phandle(np, "sound-dai", 0);
 101         if (!node)
 102                 return -ENODEV;
 103         *p_node = node;
 104
 105         /* get dai->name */
 106         ret = snd_soc_of_get_dai_name(np, name);
 107         if (ret < 0)
 108                 goto parse_error;
 109
 110         /* parse TDM slot */
 111         ret = snd_soc_of_parse_tdm_slot(np, &dai->slots, &dai->slot_width);
 112         if (ret)
 113                 goto parse_error;
 114
 115         /*
 116          * bitclock-inversion, frame-inversion
 117          * bitclock-master,    frame-master
 118          * and specific "format" if it has
 119          */
 120         dai->fmt = snd_soc_of_parse_daifmt(np, NULL);
 121         dai->fmt |= daifmt;
 122
 123         /*
 124          * dai->sysclk come from
 125          *  "clocks = <&xxx>" (if system has common clock)
 126          *  or "system-clock-frequency = <xxx>"
 127          *  or device's module clock.
 128          */
 129         if (of_property_read_bool(np, "clocks")) {
 130                 clk = of_clk_get(np, 0);
 131                 if (IS_ERR(clk)) {
 132                         ret = PTR_ERR(clk);
 133                         goto parse_error;
 134                 }
 135
 136                 dai->sysclk = clk_get_rate(clk);
 137         } else if (of_property_read_bool(np, "system-clock-frequency")) {
 138                 of_property_read_u32(np,
 139                                      "system-clock-frequency",
 140                                      &dai->sysclk);
 141         } else {
 142                 clk = of_clk_get(node, 0);
 143                 if (!IS_ERR(clk))
 144                         dai->sysclk = clk_get_rate(clk);
 145         }
 146
 147         ret = 0;
 148
 149 parse_error:
 150         of_node_put(node);
 151
 152         return ret;
 153 }
 154
 155 static int asoc_simple_card_parse_of(struct device_node *node,
 156                                      struct simple_card_data *priv,
 157                                      struct device *dev)
 158 {
 159         struct snd_soc_dai_link *dai_link = priv->snd_card.dai_link;
 160         struct device_node *np;
 161         char *name;
 162         int ret;
 163
 164         /* parsing the card name from DT */
 165         snd_soc_of_parse_card_name(&priv->snd_card, "simple-audio-card,name");
 166
 167         /* get CPU/CODEC common format via simple-audio-card,format */
 168         priv->daifmt = snd_soc_of_parse_daifmt(node, "simple-audio-card,") &
 169                 (SND_SOC_DAIFMT_FORMAT_MASK | SND_SOC_DAIFMT_INV_MASK);
 170
 171         /* off-codec widgets */
 172         if (of_property_read_bool(node, "simple-audio-card,widgets")) {
 173                 ret = snd_soc_of_parse_audio_simple_widgets(&priv->snd_card,
 174                                         "simple-audio-card,widgets");
 175                 if (ret)
 176                         return ret;
 177         }
 178
 179         /* DAPM routes */
 180         if (of_property_read_bool(node, "simple-audio-card,routing")) {
 181                 ret = snd_soc_of_parse_audio_routing(&priv->snd_card,
 182                                         "simple-audio-card,routing");
 183                 if (ret)
 184                         return ret;
 185         }
 186
 187         /* CPU sub-node */
 188         ret = -EINVAL;
 189         np = of_get_child_by_name(node, "simple-audio-card,cpu");
 190         if (np)
 191                 ret = asoc_simple_card_sub_parse_of(np, priv->daifmt,
 192                                                   &priv->cpu_dai,
 193                                                   &dai_link->cpu_of_node,
 194                                                   &dai_link->cpu_dai_name);
 195         if (ret < 0)
 196                 return ret;
 197
 198         /* CODEC sub-node */
 199         ret = -EINVAL;
 200         np = of_get_child_by_name(node, "simple-audio-card,codec");
 201         if (np)
 202                 ret = asoc_simple_card_sub_parse_of(np, priv->daifmt,
 203                                                   &priv->codec_dai,
 204                                                   &dai_link->codec_of_node,
 205                                                   &dai_link->codec_dai_name);
 206         if (ret < 0)
 207                 return ret;
 208
 209         if (!dai_link->cpu_dai_name || !dai_link->codec_dai_name)
 210                 return -EINVAL;
 211
 212         /* card name is created from CPU/CODEC dai name */
 213         name = devm_kzalloc(dev,
 214                             strlen(dai_link->cpu_dai_name)   +
 215                             strlen(dai_link->codec_dai_name) + 2,
 216                             GFP_KERNEL);
 217         sprintf(name, "%s-%s", dai_link->cpu_dai_name,
 218                                 dai_link->codec_dai_name);
 219         if (!priv->snd_card.name)
 220                 priv->snd_card.name = name;
 221         dai_link->name = dai_link->stream_name = name;
 222
 223         /* simple-card assumes platform == cpu */
 224         dai_link->platform_of_node = dai_link->cpu_of_node;
 225
 226         dev_dbg(dev, "card-name : %s\n", name);
 227         dev_dbg(dev, "platform : %04x\n", priv->daifmt);
 228         dev_dbg(dev, "cpu : %s / %04x / %d\n",
 229                 dai_link->cpu_dai_name,
 230                 priv->cpu_dai.fmt,
 231                 priv->cpu_dai.sysclk);
 232         dev_dbg(dev, "codec : %s / %04x / %d\n",
 233                 dai_link->codec_dai_name,
 234                 priv->codec_dai.fmt,
 235                 priv->codec_dai.sysclk);
 236
 237         /*
 238          * soc_bind_dai_link() will check cpu name
 239          * after of_node matching if dai_link has cpu_dai_name.
 240          * but, it will never match if name was created by fmt_single_name()
 241          * remove cpu_dai_name to escape name matching.
 242          * see
 243          *      fmt_single_name()
 244          *      fmt_multiple_name()
 245          */
 246         dai_link->cpu_dai_name = NULL;
 247
 248         return 0;
 249 }
 250
 251 static int asoc_simple_card_probe(struct platform_device *pdev)
 252 {
 253         struct simple_card_data *priv;
 254         struct snd_soc_dai_link *dai_link;
 255         struct device_node *np = pdev->dev.of_node;
 256         struct device *dev = &pdev->dev;
 257         int ret;
 258
 259         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 260         if (!priv)
 261                 return -ENOMEM;
 262
 263         /*
 264          * init snd_soc_card
 265          */
 266         priv->snd_card.owner = THIS_MODULE;
 267         priv->snd_card.dev = dev;
 268         dai_link = &priv->snd_link;
 269         priv->snd_card.dai_link = dai_link;
 270         priv->snd_card.num_links = 1;
 271
 272         if (np && of_device_is_available(np)) {
 273
 274                 ret = asoc_simple_card_parse_of(np, priv, dev);
 275                 if (ret < 0) {
 276                         if (ret != -EPROBE_DEFER)
 277                                 dev_err(dev, "parse error %d\n", ret);
 278                         return ret;
 279                 }
 280         } else {
 281                 struct asoc_simple_card_info *cinfo;
 282
 283                 cinfo = dev->platform_data;
 284                 if (!cinfo) {
 285                         dev_err(dev, "no info for asoc-simple-card\n");
 286                         return -EINVAL;
 287                 }
 288
 289                 if (!cinfo->name        ||
 290                     !cinfo->card        ||
 291                     !cinfo->codec_dai.name      ||
 292                     !cinfo->codec       ||
 293                     !cinfo->platform    ||
 294                     !cinfo->cpu_dai.name) {
 295                         dev_err(dev, "insufficient asoc_simple_card_info settings\n");
 296                         return -EINVAL;
 297                 }
 298
 299                 priv->snd_card.name     = cinfo->card;
 300                 dai_link->name          = cinfo->name;
 301                 dai_link->stream_name   = cinfo->name;
 302                 dai_link->platform_name = cinfo->platform;
 303                 dai_link->codec_name    = cinfo->codec;
 304                 dai_link->cpu_dai_name  = cinfo->cpu_dai.name;
 305                 dai_link->codec_dai_name = cinfo->codec_dai.name;
 306                 memcpy(&priv->cpu_dai, &cinfo->cpu_dai,
 307                                                 sizeof(priv->cpu_dai));
 308                 memcpy(&priv->codec_dai, &cinfo->codec_dai,
 309                                                 sizeof(priv->codec_dai));
 310
 311                 priv->cpu_dai.fmt       |= cinfo->daifmt;
 312                 priv->codec_dai.fmt     |= cinfo->daifmt;
 313         }
 314
 315         /*
 316          * init snd_soc_dai_link
 317          */
 318         dai_link->init = asoc_simple_card_dai_init;
 319
 320         snd_soc_card_set_drvdata(&priv->snd_card, priv);
 321
 322         return devm_snd_soc_register_card(&pdev->dev, &priv->snd_card);
 323 }
 324
 325 static const struct of_device_id asoc_simple_of_match[] = {
 326         { .compatible = "simple-audio-card", },
 327         {},
 328 };
 329 MODULE_DEVICE_TABLE(of, asoc_simple_of_match);
 330
 331 static struct platform_driver asoc_simple_card = {
 332         .driver = {
 333                 .name   = "asoc-simple-card",
 334                 .owner = THIS_MODULE,
 335                 .of_match_table = asoc_simple_of_match,
 336         },
 337         .probe          = asoc_simple_card_probe,
 338 };
 339
 340 module_platform_driver(asoc_simple_card);
 341
 342 MODULE_ALIAS("platform:asoc-simple-card");
 343 MODULE_LICENSE("GPL");
 344 MODULE_DESCRIPTION("ASoC Simple Sound Card");
 345 MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");