sound/soc/generic/audio-graph-card.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 //
   3 // ASoC audio graph sound card support
   4 //
   5 // Copyright (C) 2016 Renesas Solutions Corp.
   6 // Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
   7 //
   8 // based on ${LINUX}/sound/soc/generic/simple-card.c
   9
  10 #include <linux/clk.h>
  11 #include <linux/device.h>
  12 #include <linux/gpio.h>
  13 #include <linux/gpio/consumer.h>
  14 #include <linux/module.h>
  15 #include <linux/of.h>
  16 #include <linux/of_device.h>
  17 #include <linux/of_gpio.h>
  18 #include <linux/of_graph.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/string.h>
  21 #include <sound/graph_card.h>
  22
  23 #define DPCM_SELECTABLE 1
  24
  25 static int graph_outdrv_event(struct snd_soc_dapm_widget *w,
  26                               struct snd_kcontrol *kcontrol,
  27                               int event)
  28 {
  29         struct snd_soc_dapm_context *dapm = w->dapm;
  30         struct asoc_simple_priv *priv = snd_soc_card_get_drvdata(dapm->card);
  31
  32         switch (event) {
  33         case SND_SOC_DAPM_POST_PMU:
  34                 gpiod_set_value_cansleep(priv->pa_gpio, 1);
  35                 break;
  36         case SND_SOC_DAPM_PRE_PMD:
  37                 gpiod_set_value_cansleep(priv->pa_gpio, 0);
  38                 break;
  39         default:
  40                 return -EINVAL;
  41         }
  42
  43         return 0;
  44 }
  45
  46 static const struct snd_soc_dapm_widget graph_dapm_widgets[] = {
  47         SND_SOC_DAPM_OUT_DRV_E("Amplifier", SND_SOC_NOPM,
  48                                0, 0, NULL, 0, graph_outdrv_event,
  49                                SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD),
  50 };
  51
  52 static const struct snd_soc_ops graph_ops = {
  53         .startup        = asoc_simple_startup,
  54         .shutdown       = asoc_simple_shutdown,
  55         .hw_params      = asoc_simple_hw_params,
  56 };
  57
  58 static int graph_get_dai_id(struct device_node *ep)
  59 {
  60         struct device_node *node;
  61         struct device_node *endpoint;
  62         struct of_endpoint info;
  63         int i, id;
  64         const u32 *reg;
  65         int ret;
  66
  67         /* use driver specified DAI ID if exist */
  68         ret = snd_soc_get_dai_id(ep);
  69         if (ret != -ENOTSUPP)
  70                 return ret;
  71
  72         /* use endpoint/port reg if exist */
  73         ret = of_graph_parse_endpoint(ep, &info);
  74         if (ret == 0) {
  75                 /*
  76                  * Because it will count port/endpoint if it doesn't have "reg".
  77                  * But, we can't judge whether it has "no reg", or "reg = <0>"
  78                  * only of_graph_parse_endpoint().
  79                  * We need to check "reg" property
  80                  */
  81                 if (of_get_property(ep,   "reg", NULL))
  82                         return info.id;
  83
  84                 node = of_get_parent(ep);
  85                 reg = of_get_property(node, "reg", NULL);
  86                 of_node_put(node);
  87                 if (reg)
  88                         return info.port;
  89         }
  90         node = of_graph_get_port_parent(ep);
  91
  92         /*
  93          * Non HDMI sound case, counting port/endpoint on its DT
  94          * is enough. Let's count it.
  95          */
  96         i = 0;
  97         id = -1;
  98         for_each_endpoint_of_node(node, endpoint) {
  99                 if (endpoint == ep)
 100                         id = i;
 101                 i++;
 102         }
 103
 104         of_node_put(node);
 105
 106         if (id < 0)
 107                 return -ENODEV;
 108
 109         return id;
 110 }
 111
 112 static bool soc_component_is_pcm(struct snd_soc_dai_link_component *dlc)
 113 {
 114         struct snd_soc_dai *dai = snd_soc_find_dai_with_mutex(dlc);
 115
 116         if (dai && (dai->component->driver->pcm_construct ||
 117                     dai->driver->pcm_new))
 118                 return true;
 119
 120         return false;
 121 }
 122
 123 static int asoc_simple_parse_dai(struct device_node *ep,
 124                                  struct snd_soc_dai_link_component *dlc,
 125                                  int *is_single_link)
 126 {
 127         struct device_node *node;
 128         struct of_phandle_args args;
 129         int ret;
 130
 131         if (!ep)
 132                 return 0;
 133
 134         node = of_graph_get_port_parent(ep);
 135
 136         /* Get dai->name */
 137         args.np         = node;
 138         args.args[0]    = graph_get_dai_id(ep);
 139         args.args_count = (of_graph_get_endpoint_count(node) > 1);
 140
 141         /*
 142          * FIXME
 143          *
 144          * Here, dlc->dai_name is pointer to CPU/Codec DAI name.
 145          * If user unbinded CPU or Codec driver, but not for Sound Card,
 146          * dlc->dai_name is keeping unbinded CPU or Codec
 147          * driver's pointer.
 148          *
 149          * If user re-bind CPU or Codec driver again, ALSA SoC will try
 150          * to rebind Card via snd_soc_try_rebind_card(), but because of
 151          * above reason, it might can't bind Sound Card.
 152          * Because Sound Card is pointing to released dai_name pointer.
 153          *
 154          * To avoid this rebind Card issue,
 155          * 1) It needs to alloc memory to keep dai_name eventhough
 156          *    CPU or Codec driver was unbinded, or
 157          * 2) user need to rebind Sound Card everytime
 158          *    if he unbinded CPU or Codec.
 159          */
 160         ret = snd_soc_get_dai_name(&args, &dlc->dai_name);
 161         if (ret < 0)
 162                 return ret;
 163
 164         dlc->of_node = node;
 165
 166         if (is_single_link)
 167                 *is_single_link = of_graph_get_endpoint_count(node) == 1;
 168
 169         return 0;
 170 }
 171
 172 static void graph_parse_convert(struct device *dev,
 173                                 struct device_node *ep,
 174                                 struct asoc_simple_data *adata)
 175 {
 176         struct device_node *top = dev->of_node;
 177         struct device_node *port = of_get_parent(ep);
 178         struct device_node *ports = of_get_parent(port);
 179         struct device_node *node = of_graph_get_port_parent(ep);
 180
 181         asoc_simple_parse_convert(top,   NULL,   adata);
 182         if (of_node_name_eq(ports, "ports"))
 183                 asoc_simple_parse_convert(ports, NULL, adata);
 184         asoc_simple_parse_convert(port,  NULL,   adata);
 185         asoc_simple_parse_convert(ep,    NULL,   adata);
 186
 187         of_node_put(port);
 188         of_node_put(ports);
 189         of_node_put(node);
 190 }
 191
 192 static void graph_parse_mclk_fs(struct device_node *top,
 193                                 struct device_node *ep,
 194                                 struct simple_dai_props *props)
 195 {
 196         struct device_node *port        = of_get_parent(ep);
 197         struct device_node *ports       = of_get_parent(port);
 198
 199         of_property_read_u32(top,       "mclk-fs", &props->mclk_fs);
 200         if (of_node_name_eq(ports, "ports"))
 201                 of_property_read_u32(ports, "mclk-fs", &props->mclk_fs);
 202         of_property_read_u32(port,      "mclk-fs", &props->mclk_fs);
 203         of_property_read_u32(ep,        "mclk-fs", &props->mclk_fs);
 204
 205         of_node_put(port);
 206         of_node_put(ports);
 207 }
 208
 209 static int graph_parse_node(struct asoc_simple_priv *priv,
 210                             struct device_node *ep,
 211                             struct link_info *li,
 212                             int is_cpu)
 213 {
 214         struct device *dev = simple_priv_to_dev(priv);
 215         struct device_node *top = dev->of_node;
 216         struct snd_soc_dai_link *dai_link = simple_priv_to_link(priv, li->link);
 217         struct simple_dai_props *dai_props = simple_priv_to_props(priv, li->link);
 218         struct snd_soc_dai_link_component *dlc;
 219         struct asoc_simple_dai *dai;
 220         int ret, single = 0;
 221
 222         if (is_cpu) {
 223                 dlc = asoc_link_to_cpu(dai_link, 0);
 224                 dai = simple_props_to_dai_cpu(dai_props, 0);
 225         } else {
 226                 dlc = asoc_link_to_codec(dai_link, 0);
 227                 dai = simple_props_to_dai_codec(dai_props, 0);
 228         }
 229
 230         graph_parse_mclk_fs(top, ep, dai_props);
 231
 232         ret = asoc_simple_parse_dai(ep, dlc, &single);
 233         if (ret < 0)
 234                 return ret;
 235
 236         ret = asoc_simple_parse_tdm(ep, dai);
 237         if (ret < 0)
 238                 return ret;
 239
 240         ret = asoc_simple_parse_clk(dev, ep, dai, dlc);
 241         if (ret < 0)
 242                 return ret;
 243
 244         if (is_cpu)
 245                 asoc_simple_canonicalize_cpu(dlc, single);
 246
 247         return 0;
 248 }
 249
 250 static int graph_link_init(struct asoc_simple_priv *priv,
 251                            struct device_node *cpu_ep,
 252                            struct device_node *codec_ep,
 253                            struct link_info *li,
 254                            char *name)
 255 {
 256         struct device *dev = simple_priv_to_dev(priv);
 257         struct snd_soc_dai_link *dai_link = simple_priv_to_link(priv, li->link);
 258         int ret;
 259
 260         ret = asoc_simple_parse_daifmt(dev, cpu_ep, codec_ep,
 261                                        NULL, &dai_link->dai_fmt);
 262         if (ret < 0)
 263                 return ret;
 264
 265         dai_link->init          = asoc_simple_dai_init;
 266         dai_link->ops           = &graph_ops;
 267         if (priv->ops)
 268                 dai_link->ops   = priv->ops;
 269
 270         return asoc_simple_set_dailink_name(dev, dai_link, name);
 271 }
 272
 273 static int graph_dai_link_of_dpcm(struct asoc_simple_priv *priv,
 274                                   struct device_node *cpu_ep,
 275                                   struct device_node *codec_ep,
 276                                   struct link_info *li)
 277 {
 278         struct device *dev = simple_priv_to_dev(priv);
 279         struct snd_soc_dai_link *dai_link = simple_priv_to_link(priv, li->link);
 280         struct simple_dai_props *dai_props = simple_priv_to_props(priv, li->link);
 281         struct device_node *top = dev->of_node;
 282         struct device_node *ep = li->cpu ? cpu_ep : codec_ep;
 283         char dai_name[64];
 284         int ret;
 285
 286         dev_dbg(dev, "link_of DPCM (%pOF)\n", ep);
 287
 288         if (li->cpu) {
 289                 struct snd_soc_card *card = simple_priv_to_card(priv);
 290                 struct snd_soc_dai_link_component *cpus = asoc_link_to_cpu(dai_link, 0);
 291
 292                 /* Codec is dummy */
 293
 294                 /* FE settings */
 295                 dai_link->dynamic               = 1;
 296                 dai_link->dpcm_merged_format    = 1;
 297
 298                 ret = graph_parse_node(priv, cpu_ep, li, 1);
 299                 if (ret)
 300                         return ret;
 301
 302                 snprintf(dai_name, sizeof(dai_name),
 303                          "fe.%pOFP.%s", cpus->of_node, cpus->dai_name);
 304                 /*
 305                  * In BE<->BE connections it is not required to create
 306                  * PCM devices at CPU end of the dai link and thus 'no_pcm'
 307                  * flag needs to be set. It is useful when there are many
 308                  * BE components and some of these have to be connected to
 309                  * form a valid audio path.
 310                  *
 311                  * For example: FE <-> BE1 <-> BE2 <-> ... <-> BEn where
 312                  * there are 'n' BE components in the path.
 313                  */
 314                 if (card->component_chaining && !soc_component_is_pcm(cpus))
 315                         dai_link->no_pcm = 1;
 316         } else {
 317                 struct snd_soc_codec_conf *cconf = simple_props_to_codec_conf(dai_props, 0);
 318                 struct snd_soc_dai_link_component *codecs = asoc_link_to_codec(dai_link, 0);
 319                 struct device_node *port;
 320                 struct device_node *ports;
 321
 322                 /* CPU is dummy */
 323
 324                 /* BE settings */
 325                 dai_link->no_pcm                = 1;
 326                 dai_link->be_hw_params_fixup    = asoc_simple_be_hw_params_fixup;
 327
 328                 ret = graph_parse_node(priv, codec_ep, li, 0);
 329                 if (ret < 0)
 330                         return ret;
 331
 332                 snprintf(dai_name, sizeof(dai_name),
 333                          "be.%pOFP.%s", codecs->of_node, codecs->dai_name);
 334
 335                 /* check "prefix" from top node */
 336                 port = of_get_parent(ep);
 337                 ports = of_get_parent(port);
 338                 snd_soc_of_parse_node_prefix(top, cconf, codecs->of_node,
 339                                               "prefix");
 340                 if (of_node_name_eq(ports, "ports"))
 341                         snd_soc_of_parse_node_prefix(ports, cconf, codecs->of_node, "prefix");
 342                 snd_soc_of_parse_node_prefix(port, cconf, codecs->of_node,
 343                                              "prefix");
 344
 345                 of_node_put(ports);
 346                 of_node_put(port);
 347         }
 348
 349         graph_parse_convert(dev, ep, &dai_props->adata);
 350
 351         snd_soc_dai_link_set_capabilities(dai_link);
 352
 353         ret = graph_link_init(priv, cpu_ep, codec_ep, li, dai_name);
 354
 355         li->link++;
 356
 357         return ret;
 358 }
 359
 360 static int graph_dai_link_of(struct asoc_simple_priv *priv,
 361                              struct device_node *cpu_ep,
 362                              struct device_node *codec_ep,
 363                              struct link_info *li)
 364 {
 365         struct device *dev = simple_priv_to_dev(priv);
 366         struct snd_soc_dai_link *dai_link = simple_priv_to_link(priv, li->link);
 367         struct snd_soc_dai_link_component *cpus = asoc_link_to_cpu(dai_link, 0);
 368         struct snd_soc_dai_link_component *codecs = asoc_link_to_codec(dai_link, 0);
 369         char dai_name[64];
 370         int ret;
 371
 372         dev_dbg(dev, "link_of (%pOF)\n", cpu_ep);
 373
 374         ret = graph_parse_node(priv, cpu_ep, li, 1);
 375         if (ret < 0)
 376                 return ret;
 377
 378         ret = graph_parse_node(priv, codec_ep, li, 0);
 379         if (ret < 0)
 380                 return ret;
 381
 382         snprintf(dai_name, sizeof(dai_name),
 383                  "%s-%s", cpus->dai_name, codecs->dai_name);
 384         ret = graph_link_init(priv, cpu_ep, codec_ep, li, dai_name);
 385         if (ret < 0)
 386                 return ret;
 387
 388         li->link++;
 389
 390         return 0;
 391 }
 392
 393 static inline bool parse_as_dpcm_link(struct asoc_simple_priv *priv,
 394                                       struct device_node *codec_port,
 395                                       struct asoc_simple_data *adata)
 396 {
 397         if (priv->force_dpcm)
 398                 return true;
 399
 400         if (!priv->dpcm_selectable)
 401                 return false;
 402
 403         /*
 404          * It is DPCM
 405          * if Codec port has many endpoints,
 406          * or has convert-xxx property
 407          */
 408         if ((of_get_child_count(codec_port) > 1) ||
 409             (adata->convert_rate || adata->convert_channels))
 410                 return true;
 411
 412         return false;
 413 }
 414
 415 static int __graph_for_each_link(struct asoc_simple_priv *priv,
 416                         struct link_info *li,
 417                         int (*func_noml)(struct asoc_simple_priv *priv,
 418                                          struct device_node *cpu_ep,
 419                                          struct device_node *codec_ep,
 420                                          struct link_info *li),
 421                         int (*func_dpcm)(struct asoc_simple_priv *priv,
 422                                          struct device_node *cpu_ep,
 423                                          struct device_node *codec_ep,
 424                                          struct link_info *li))
 425 {
 426         struct of_phandle_iterator it;
 427         struct device *dev = simple_priv_to_dev(priv);
 428         struct device_node *node = dev->of_node;
 429         struct device_node *cpu_port;
 430         struct device_node *cpu_ep;
 431         struct device_node *codec_ep;
 432         struct device_node *codec_port;
 433         struct device_node *codec_port_old = NULL;
 434         struct asoc_simple_data adata;
 435         int rc, ret = 0;
 436
 437         /* loop for all listed CPU port */
 438         of_for_each_phandle(&it, rc, node, "dais", NULL, 0) {
 439                 cpu_port = it.node;
 440                 cpu_ep   = NULL;
 441
 442                 /* loop for all CPU endpoint */
 443                 while (1) {
 444                         cpu_ep = of_get_next_child(cpu_port, cpu_ep);
 445                         if (!cpu_ep)
 446                                 break;
 447
 448                         /* get codec */
 449                         codec_ep = of_graph_get_remote_endpoint(cpu_ep);
 450                         codec_port = of_get_parent(codec_ep);
 451
 452                         /* get convert-xxx property */
 453                         memset(&adata, 0, sizeof(adata));
 454                         graph_parse_convert(dev, codec_ep, &adata);
 455                         graph_parse_convert(dev, cpu_ep,   &adata);
 456
 457                         /* check if link requires DPCM parsing */
 458                         if (parse_as_dpcm_link(priv, codec_port, &adata)) {
 459                                 /*
 460                                  * Codec endpoint can be NULL for pluggable audio HW.
 461                                  * Platform DT can populate the Codec endpoint depending on the
 462                                  * plugged HW.
 463                                  */
 464                                 /* Do it all CPU endpoint, and 1st Codec endpoint */
 465                                 if (li->cpu ||
 466                                     ((codec_port_old != codec_port) && codec_ep))
 467                                         ret = func_dpcm(priv, cpu_ep, codec_ep, li);
 468                         /* else normal sound */
 469                         } else {
 470                                 if (li->cpu)
 471                                         ret = func_noml(priv, cpu_ep, codec_ep, li);
 472                         }
 473
 474                         of_node_put(codec_ep);
 475                         of_node_put(codec_port);
 476
 477                         if (ret < 0)
 478                                 return ret;
 479
 480                         codec_port_old = codec_port;
 481                 }
 482         }
 483
 484         return 0;
 485 }
 486
 487 static int graph_for_each_link(struct asoc_simple_priv *priv,
 488                                struct link_info *li,
 489                                int (*func_noml)(struct asoc_simple_priv *priv,
 490                                                 struct device_node *cpu_ep,
 491                                                 struct device_node *codec_ep,
 492                                                 struct link_info *li),
 493                                int (*func_dpcm)(struct asoc_simple_priv *priv,
 494                                                 struct device_node *cpu_ep,
 495                                                 struct device_node *codec_ep,
 496                                                 struct link_info *li))
 497 {
 498         int ret;
 499         /*
 500          * Detect all CPU first, and Detect all Codec 2nd.
 501          *
 502          * In Normal sound case, all DAIs are detected
 503          * as "CPU-Codec".
 504          *
 505          * In DPCM sound case,
 506          * all CPUs   are detected as "CPU-dummy", and
 507          * all Codecs are detected as "dummy-Codec".
 508          * To avoid random sub-device numbering,
 509          * detect "dummy-Codec" in last;
 510          */
 511         for (li->cpu = 1; li->cpu >= 0; li->cpu--) {
 512                 ret = __graph_for_each_link(priv, li, func_noml, func_dpcm);
 513                 if (ret < 0)
 514                         break;
 515         }
 516
 517         return ret;
 518 }
 519
 520 static int graph_get_dais_count(struct asoc_simple_priv *priv,
 521                                 struct link_info *li);
 522
 523 int audio_graph_parse_of(struct asoc_simple_priv *priv, struct device *dev)
 524 {
 525         struct snd_soc_card *card = simple_priv_to_card(priv);
 526         struct link_info *li;
 527         int ret;
 528
 529         li = devm_kzalloc(dev, sizeof(*li), GFP_KERNEL);
 530         if (!li)
 531                 return -ENOMEM;
 532
 533         card->owner = THIS_MODULE;
 534         card->dev = dev;
 535
 536         ret = graph_get_dais_count(priv, li);
 537         if (ret < 0)
 538                 return ret;
 539
 540         if (!li->link)
 541                 return -EINVAL;
 542
 543         ret = asoc_simple_init_priv(priv, li);
 544         if (ret < 0)
 545                 return ret;
 546
 547         priv->pa_gpio = devm_gpiod_get_optional(dev, "pa", GPIOD_OUT_LOW);
 548         if (IS_ERR(priv->pa_gpio)) {
 549                 ret = PTR_ERR(priv->pa_gpio);
 550                 dev_err(dev, "failed to get amplifier gpio: %d\n", ret);
 551                 return ret;
 552         }
 553
 554         ret = asoc_simple_parse_widgets(card, NULL);
 555         if (ret < 0)
 556                 return ret;
 557
 558         ret = asoc_simple_parse_routing(card, NULL);
 559         if (ret < 0)
 560                 return ret;
 561
 562         memset(li, 0, sizeof(*li));
 563         ret = graph_for_each_link(priv, li,
 564                                   graph_dai_link_of,
 565                                   graph_dai_link_of_dpcm);
 566         if (ret < 0)
 567                 goto err;
 568
 569         ret = asoc_simple_parse_card_name(card, NULL);
 570         if (ret < 0)
 571                 goto err;
 572
 573         snd_soc_card_set_drvdata(card, priv);
 574
 575         asoc_simple_debug_info(priv);
 576
 577         ret = devm_snd_soc_register_card(dev, card);
 578         if (ret < 0)
 579                 goto err;
 580
 581         devm_kfree(dev, li);
 582         return 0;
 583
 584 err:
 585         asoc_simple_clean_reference(card);
 586
 587         if (ret != -EPROBE_DEFER)
 588                 dev_err(dev, "parse error %d\n", ret);
 589
 590         return ret;
 591 }
 592 EXPORT_SYMBOL_GPL(audio_graph_parse_of);
 593
 594 static int graph_count_noml(struct asoc_simple_priv *priv,
 595                             struct device_node *cpu_ep,
 596                             struct device_node *codec_ep,
 597                             struct link_info *li)
 598 {
 599         struct device *dev = simple_priv_to_dev(priv);
 600
 601         if (li->link >= SNDRV_MAX_LINKS) {
 602                 dev_err(dev, "too many links\n");
 603                 return -EINVAL;
 604         }
 605
 606         li->num[li->link].cpus          = 1;
 607         li->num[li->link].codecs        = 1;
 608
 609         li->link += 1; /* 1xCPU-Codec */
 610
 611         dev_dbg(dev, "Count As Normal\n");
 612
 613         return 0;
 614 }
 615
 616 static int graph_count_dpcm(struct asoc_simple_priv *priv,
 617                             struct device_node *cpu_ep,
 618                             struct device_node *codec_ep,
 619                             struct link_info *li)
 620 {
 621         struct device *dev = simple_priv_to_dev(priv);
 622
 623         if (li->link >= SNDRV_MAX_LINKS) {
 624                 dev_err(dev, "too many links\n");
 625                 return -EINVAL;
 626         }
 627
 628         if (li->cpu) {
 629                 li->num[li->link].cpus          = 1;
 630
 631                 li->link++; /* 1xCPU-dummy */
 632         } else {
 633                 li->num[li->link].codecs        = 1;
 634
 635                 li->link++; /* 1xdummy-Codec */
 636         }
 637
 638         dev_dbg(dev, "Count As DPCM\n");
 639
 640         return 0;
 641 }
 642
 643 static int graph_get_dais_count(struct asoc_simple_priv *priv,
 644                                 struct link_info *li)
 645 {
 646         /*
 647          * link_num :   number of links.
 648          *              CPU-Codec / CPU-dummy / dummy-Codec
 649          * dais_num :   number of DAIs
 650          * ccnf_num :   number of codec_conf
 651          *              same number for "dummy-Codec"
 652          *
 653          * ex1)
 654          * CPU0 --- Codec0      link : 5
 655          * CPU1 --- Codec1      dais : 7
 656          * CPU2 -/              ccnf : 1
 657          * CPU3 --- Codec2
 658          *
 659          *      => 5 links = 2xCPU-Codec + 2xCPU-dummy + 1xdummy-Codec
 660          *      => 7 DAIs  = 4xCPU + 3xCodec
 661          *      => 1 ccnf  = 1xdummy-Codec
 662          *
 663          * ex2)
 664          * CPU0 --- Codec0      link : 5
 665          * CPU1 --- Codec1      dais : 6
 666          * CPU2 -/              ccnf : 1
 667          * CPU3 -/
 668          *
 669          *      => 5 links = 1xCPU-Codec + 3xCPU-dummy + 1xdummy-Codec
 670          *      => 6 DAIs  = 4xCPU + 2xCodec
 671          *      => 1 ccnf  = 1xdummy-Codec
 672          *
 673          * ex3)
 674          * CPU0 --- Codec0      link : 6
 675          * CPU1 -/              dais : 6
 676          * CPU2 --- Codec1      ccnf : 2
 677          * CPU3 -/
 678          *
 679          *      => 6 links = 0xCPU-Codec + 4xCPU-dummy + 2xdummy-Codec
 680          *      => 6 DAIs  = 4xCPU + 2xCodec
 681          *      => 2 ccnf  = 2xdummy-Codec
 682          *
 683          * ex4)
 684          * CPU0 --- Codec0 (convert-rate)       link : 3
 685          * CPU1 --- Codec1                      dais : 4
 686          *                                      ccnf : 1
 687          *
 688          *      => 3 links = 1xCPU-Codec + 1xCPU-dummy + 1xdummy-Codec
 689          *      => 4 DAIs  = 2xCPU + 2xCodec
 690          *      => 1 ccnf  = 1xdummy-Codec
 691          */
 692         return graph_for_each_link(priv, li,
 693                                    graph_count_noml,
 694                                    graph_count_dpcm);
 695 }
 696
 697 static int graph_probe(struct platform_device *pdev)
 698 {
 699         struct asoc_simple_priv *priv;
 700         struct device *dev = &pdev->dev;
 701         struct snd_soc_card *card;
 702
 703         /* Allocate the private data and the DAI link array */
 704         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 705         if (!priv)
 706                 return -ENOMEM;
 707
 708         card = simple_priv_to_card(priv);
 709         card->dapm_widgets      = graph_dapm_widgets;
 710         card->num_dapm_widgets  = ARRAY_SIZE(graph_dapm_widgets);
 711         card->probe             = asoc_graph_card_probe;
 712
 713         if (of_device_get_match_data(dev))
 714                 priv->dpcm_selectable = 1;
 715
 716         return audio_graph_parse_of(priv, dev);
 717 }
 718
 719 static const struct of_device_id graph_of_match[] = {
 720         { .compatible = "audio-graph-card", },
 721         { .compatible = "audio-graph-scu-card",
 722           .data = (void *)DPCM_SELECTABLE },
 723         {},
 724 };
 725 MODULE_DEVICE_TABLE(of, graph_of_match);
 726
 727 static struct platform_driver graph_card = {
 728         .driver = {
 729                 .name = "asoc-audio-graph-card",
 730                 .pm = &snd_soc_pm_ops,
 731                 .of_match_table = graph_of_match,
 732         },
 733         .probe = graph_probe,
 734         .remove = asoc_simple_remove,
 735 };
 736 module_platform_driver(graph_card);
 737
 738 MODULE_ALIAS("platform:asoc-audio-graph-card");
 739 MODULE_LICENSE("GPL v2");
 740 MODULE_DESCRIPTION("ASoC Audio Graph Sound Card");
 741 MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");