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