sound/soc/sh/rcar/rsrc-card.c

   1 /*
   2  * Renesas Sampling Rate Convert Sound Card for DPCM
   3  *
   4  * Copyright (C) 2015 Renesas Solutions Corp.
   5  * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
   6  *
   7  * based on ${LINUX}/sound/soc/generic/simple-card.c
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13 #include <linux/clk.h>
  14 #include <linux/device.h>
  15 #include <linux/module.h>
  16 #include <linux/of.h>
  17 #include <linux/of_device.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/string.h>
  20 #include <sound/jack.h>
  21 #include <sound/soc.h>
  22 #include <sound/soc-dai.h>
  23
  24 struct rsrc_card_of_data {
  25         const char *prefix;
  26         const struct snd_soc_dapm_route *routes;
  27         int num_routes;
  28 };
  29
  30 static const struct snd_soc_dapm_route routes_ssi0_ak4642[] = {
  31         {"ak4642 Playback", NULL, "DAI0 Playback"},
  32         {"DAI0 Capture", NULL, "ak4642 Capture"},
  33 };
  34
  35 static const struct rsrc_card_of_data routes_of_ssi0_ak4642 = {
  36         .prefix         = "ak4642",
  37         .routes         = routes_ssi0_ak4642,
  38         .num_routes     = ARRAY_SIZE(routes_ssi0_ak4642),
  39 };
  40
  41 static const struct of_device_id rsrc_card_of_match[] = {
  42         { .compatible = "renesas,rsrc-card,lager",      .data = &routes_of_ssi0_ak4642 },
  43         { .compatible = "renesas,rsrc-card,koelsch",    .data = &routes_of_ssi0_ak4642 },
  44         { .compatible = "renesas,rsrc-card", },
  45         {},
  46 };
  47 MODULE_DEVICE_TABLE(of, rsrc_card_of_match);
  48
  49 #define DAI_NAME_NUM    32
  50 struct rsrc_card_dai {
  51         unsigned int sysclk;
  52         unsigned int tx_slot_mask;
  53         unsigned int rx_slot_mask;
  54         int slots;
  55         int slot_width;
  56         struct clk *clk;
  57         char dai_name[DAI_NAME_NUM];
  58 };
  59
  60 #define IDX_CPU         0
  61 #define IDX_CODEC       1
  62 struct rsrc_card_priv {
  63         struct snd_soc_card snd_card;
  64         struct snd_soc_codec_conf codec_conf;
  65         struct rsrc_card_dai *dai_props;
  66         struct snd_soc_dai_link *dai_link;
  67         int dai_num;
  68         u32 convert_rate;
  69 };
  70
  71 #define rsrc_priv_to_dev(priv) ((priv)->snd_card.dev)
  72 #define rsrc_priv_to_link(priv, i) ((priv)->snd_card.dai_link + (i))
  73 #define rsrc_priv_to_props(priv, i) ((priv)->dai_props + (i))
  74 #define rsrc_dev_to_of_data(dev) (of_match_device(rsrc_card_of_match, (dev))->data)
  75
  76 static int rsrc_card_startup(struct snd_pcm_substream *substream)
  77 {
  78         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  79         struct rsrc_card_priv *priv =   snd_soc_card_get_drvdata(rtd->card);
  80         struct rsrc_card_dai *dai_props =
  81                 rsrc_priv_to_props(priv, rtd - rtd->card->rtd);
  82
  83         return clk_prepare_enable(dai_props->clk);
  84 }
  85
  86 static void rsrc_card_shutdown(struct snd_pcm_substream *substream)
  87 {
  88         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  89         struct rsrc_card_priv *priv =   snd_soc_card_get_drvdata(rtd->card);
  90         struct rsrc_card_dai *dai_props =
  91                 rsrc_priv_to_props(priv, rtd - rtd->card->rtd);
  92
  93         clk_disable_unprepare(dai_props->clk);
  94 }
  95
  96 static struct snd_soc_ops rsrc_card_ops = {
  97         .startup = rsrc_card_startup,
  98         .shutdown = rsrc_card_shutdown,
  99 };
 100
 101 static int rsrc_card_dai_init(struct snd_soc_pcm_runtime *rtd)
 102 {
 103         struct rsrc_card_priv *priv = snd_soc_card_get_drvdata(rtd->card);
 104         struct snd_soc_dai *dai;
 105         struct snd_soc_dai_link *dai_link;
 106         struct rsrc_card_dai *dai_props;
 107         int num = rtd - rtd->card->rtd;
 108         int ret;
 109
 110         dai_link        = rsrc_priv_to_link(priv, num);
 111         dai_props       = rsrc_priv_to_props(priv, num);
 112         dai             = dai_link->dynamic ?
 113                                 rtd->cpu_dai :
 114                                 rtd->codec_dai;
 115
 116         if (dai_props->sysclk) {
 117                 ret = snd_soc_dai_set_sysclk(dai, 0, dai_props->sysclk, 0);
 118                 if (ret && ret != -ENOTSUPP) {
 119                         dev_err(dai->dev, "set_sysclk error\n");
 120                         goto err;
 121                 }
 122         }
 123
 124         if (dai_props->slots) {
 125                 ret = snd_soc_dai_set_tdm_slot(dai,
 126                                                dai_props->tx_slot_mask,
 127                                                dai_props->rx_slot_mask,
 128                                                dai_props->slots,
 129                                                dai_props->slot_width);
 130                 if (ret && ret != -ENOTSUPP) {
 131                         dev_err(dai->dev, "set_tdm_slot error\n");
 132                         goto err;
 133                 }
 134         }
 135
 136         ret = 0;
 137
 138 err:
 139         return ret;
 140 }
 141
 142 static int rsrc_card_be_hw_params_fixup(struct snd_soc_pcm_runtime *rtd,
 143                                         struct snd_pcm_hw_params *params)
 144 {
 145         struct rsrc_card_priv *priv = snd_soc_card_get_drvdata(rtd->card);
 146         struct snd_interval *rate = hw_param_interval(params,
 147                                                       SNDRV_PCM_HW_PARAM_RATE);
 148
 149         if (!priv->convert_rate)
 150                 return 0;
 151
 152         rate->min = rate->max = priv->convert_rate;
 153
 154         return 0;
 155 }
 156
 157 static int rsrc_card_parse_daifmt(struct device_node *node,
 158                                   struct device_node *np,
 159                                   struct rsrc_card_priv *priv,
 160                                   int idx, bool is_fe)
 161 {
 162         struct snd_soc_dai_link *dai_link = rsrc_priv_to_link(priv, idx);
 163         struct device_node *bitclkmaster = NULL;
 164         struct device_node *framemaster = NULL;
 165         struct device_node *codec = is_fe ? NULL : np;
 166         unsigned int daifmt;
 167
 168         daifmt = snd_soc_of_parse_daifmt(node, NULL,
 169                                          &bitclkmaster, &framemaster);
 170         daifmt &= ~SND_SOC_DAIFMT_MASTER_MASK;
 171
 172         if (!bitclkmaster && !framemaster)
 173                 return -EINVAL;
 174
 175         if (codec == bitclkmaster)
 176                 daifmt |= (codec == framemaster) ?
 177                         SND_SOC_DAIFMT_CBM_CFM : SND_SOC_DAIFMT_CBM_CFS;
 178         else
 179                 daifmt |= (codec == framemaster) ?
 180                         SND_SOC_DAIFMT_CBS_CFM : SND_SOC_DAIFMT_CBS_CFS;
 181
 182         dai_link->dai_fmt = daifmt;
 183
 184         of_node_put(bitclkmaster);
 185         of_node_put(framemaster);
 186
 187         return 0;
 188 }
 189
 190 static int rsrc_card_parse_links(struct device_node *np,
 191                                  struct rsrc_card_priv *priv,
 192                                  int idx, bool is_fe)
 193 {
 194         struct snd_soc_dai_link *dai_link = rsrc_priv_to_link(priv, idx);
 195         struct rsrc_card_dai *dai_props = rsrc_priv_to_props(priv, idx);
 196         struct of_phandle_args args;
 197         int ret;
 198
 199         /*
 200          * Get node via "sound-dai = <&phandle port>"
 201          * it will be used as xxx_of_node on soc_bind_dai_link()
 202          */
 203         ret = of_parse_phandle_with_args(np, "sound-dai",
 204                                          "#sound-dai-cells", 0, &args);
 205         if (ret)
 206                 return ret;
 207
 208         /* Parse TDM slot */
 209         ret = snd_soc_of_parse_tdm_slot(np,
 210                                         &dai_props->tx_slot_mask,
 211                                         &dai_props->rx_slot_mask,
 212                                         &dai_props->slots,
 213                                         &dai_props->slot_width);
 214         if (ret)
 215                 return ret;
 216
 217         if (is_fe) {
 218                 /* BE is dummy */
 219                 dai_link->codec_of_node         = NULL;
 220                 dai_link->codec_dai_name        = "snd-soc-dummy-dai";
 221                 dai_link->codec_name            = "snd-soc-dummy";
 222
 223                 /* FE settings */
 224                 dai_link->dynamic               = 1;
 225                 dai_link->dpcm_merged_format    = 1;
 226                 dai_link->cpu_of_node           = args.np;
 227                 ret = snd_soc_of_get_dai_name(np, &dai_link->cpu_dai_name);
 228                 if (ret < 0)
 229                         return ret;
 230
 231                 /* set dai_name */
 232                 snprintf(dai_props->dai_name, DAI_NAME_NUM, "fe.%s",
 233                          dai_link->cpu_dai_name);
 234
 235                 /*
 236                  * In soc_bind_dai_link() will check cpu name after
 237                  * of_node matching if dai_link has cpu_dai_name.
 238                  * but, it will never match if name was created by
 239                  * fmt_single_name() remove cpu_dai_name if cpu_args
 240                  * was 0. See:
 241                  *      fmt_single_name()
 242                  *      fmt_multiple_name()
 243                  */
 244                 if (!args.args_count)
 245                         dai_link->cpu_dai_name = NULL;
 246         } else {
 247                 struct device *dev = rsrc_priv_to_dev(priv);
 248                 const struct rsrc_card_of_data *of_data;
 249
 250                 of_data = rsrc_dev_to_of_data(dev);
 251
 252                 /* FE is dummy */
 253                 dai_link->cpu_of_node           = NULL;
 254                 dai_link->cpu_dai_name          = "snd-soc-dummy-dai";
 255                 dai_link->cpu_name              = "snd-soc-dummy";
 256
 257                 /* BE settings */
 258                 dai_link->no_pcm                = 1;
 259                 dai_link->be_hw_params_fixup    = rsrc_card_be_hw_params_fixup;
 260                 dai_link->codec_of_node         = args.np;
 261                 ret = snd_soc_of_get_dai_name(np, &dai_link->codec_dai_name);
 262                 if (ret < 0)
 263                         return ret;
 264
 265                 /* additional name prefix */
 266                 if (of_data) {
 267                         priv->codec_conf.of_node = dai_link->codec_of_node;
 268                         priv->codec_conf.name_prefix = of_data->prefix;
 269                 } else {
 270                         snd_soc_of_parse_audio_prefix(&priv->snd_card,
 271                                                       &priv->codec_conf,
 272                                                       dai_link->codec_of_node,
 273                                                       "audio-prefix");
 274                 }
 275
 276                 /* set dai_name */
 277                 snprintf(dai_props->dai_name, DAI_NAME_NUM, "be.%s",
 278                          dai_link->codec_dai_name);
 279         }
 280
 281         /* Simple Card assumes platform == cpu */
 282         dai_link->platform_of_node      = dai_link->cpu_of_node;
 283         dai_link->dpcm_playback         = 1;
 284         dai_link->dpcm_capture          = 1;
 285         dai_link->name                  = dai_props->dai_name;
 286         dai_link->stream_name           = dai_props->dai_name;
 287         dai_link->ops                   = &rsrc_card_ops;
 288         dai_link->init                  = rsrc_card_dai_init;
 289
 290         return 0;
 291 }
 292
 293 static int rsrc_card_parse_clk(struct device_node *np,
 294                                struct rsrc_card_priv *priv,
 295                                int idx, bool is_fe)
 296 {
 297         struct snd_soc_dai_link *dai_link = rsrc_priv_to_link(priv, idx);
 298         struct rsrc_card_dai *dai_props = rsrc_priv_to_props(priv, idx);
 299         struct clk *clk;
 300         struct device_node *of_np = is_fe ?     dai_link->cpu_of_node :
 301                                                 dai_link->codec_of_node;
 302         u32 val;
 303
 304         /*
 305          * Parse dai->sysclk come from "clocks = <&xxx>"
 306          * (if system has common clock)
 307          *  or "system-clock-frequency = <xxx>"
 308          *  or device's module clock.
 309          */
 310         if (of_property_read_bool(np, "clocks")) {
 311                 clk = of_clk_get(np, 0);
 312                 if (IS_ERR(clk))
 313                         return PTR_ERR(clk);
 314
 315                 dai_props->sysclk = clk_get_rate(clk);
 316                 dai_props->clk = clk;
 317         } else if (!of_property_read_u32(np, "system-clock-frequency", &val)) {
 318                 dai_props->sysclk = val;
 319         } else {
 320                 clk = of_clk_get(of_np, 0);
 321                 if (!IS_ERR(clk))
 322                         dai_props->sysclk = clk_get_rate(clk);
 323         }
 324
 325         return 0;
 326 }
 327
 328 static int rsrc_card_dai_link_of(struct device_node *node,
 329                                  struct device_node *np,
 330                                  struct rsrc_card_priv *priv,
 331                                  int idx)
 332 {
 333         struct device *dev = rsrc_priv_to_dev(priv);
 334         struct snd_soc_dai_link *dai_link = rsrc_priv_to_link(priv, idx);
 335         struct rsrc_card_dai *dai_props = rsrc_priv_to_props(priv, idx);
 336         bool is_fe = false;
 337         int ret;
 338
 339         if (0 == strcmp(np->name, "cpu"))
 340                 is_fe = true;
 341
 342         ret = rsrc_card_parse_daifmt(node, np, priv, idx, is_fe);
 343         if (ret < 0)
 344                 return ret;
 345
 346         ret = rsrc_card_parse_links(np, priv, idx, is_fe);
 347         if (ret < 0)
 348                 return ret;
 349
 350         ret = rsrc_card_parse_clk(np, priv, idx, is_fe);
 351         if (ret < 0)
 352                 return ret;
 353
 354         dev_dbg(dev, "\t%s / %04x / %d\n",
 355                 dai_props->dai_name,
 356                 dai_link->dai_fmt,
 357                 dai_props->sysclk);
 358
 359         return ret;
 360 }
 361
 362 static int rsrc_card_parse_of(struct device_node *node,
 363                               struct rsrc_card_priv *priv,
 364                               struct device *dev)
 365 {
 366         const struct rsrc_card_of_data *of_data = rsrc_dev_to_of_data(dev);
 367         struct rsrc_card_dai *props;
 368         struct snd_soc_dai_link *links;
 369         struct device_node *np;
 370         int ret;
 371         int i, num;
 372
 373         if (!node)
 374                 return -EINVAL;
 375
 376         num = of_get_child_count(node);
 377         props = devm_kzalloc(dev, sizeof(*props) * num, GFP_KERNEL);
 378         links = devm_kzalloc(dev, sizeof(*links) * num, GFP_KERNEL);
 379         if (!props || !links)
 380                 return -ENOMEM;
 381
 382         priv->dai_props = props;
 383         priv->dai_link  = links;
 384         priv->dai_num   = num;
 385
 386         /* Init snd_soc_card */
 387         priv->snd_card.owner                    = THIS_MODULE;
 388         priv->snd_card.dev                      = dev;
 389         priv->snd_card.dai_link                 = priv->dai_link;
 390         priv->snd_card.num_links                = num;
 391         priv->snd_card.codec_conf               = &priv->codec_conf;
 392         priv->snd_card.num_configs              = 1;
 393
 394         if (of_data) {
 395                 priv->snd_card.of_dapm_routes           = of_data->routes;
 396                 priv->snd_card.num_of_dapm_routes       = of_data->num_routes;
 397         } else {
 398                 snd_soc_of_parse_audio_routing(&priv->snd_card,
 399                                                "audio-routing");
 400         }
 401
 402         /* Parse the card name from DT */
 403         snd_soc_of_parse_card_name(&priv->snd_card, "card-name");
 404
 405         /* sampling rate convert */
 406         of_property_read_u32(node, "convert-rate", &priv->convert_rate);
 407
 408         dev_dbg(dev, "New rsrc-audio-card: %s (%d)\n",
 409                 priv->snd_card.name ? priv->snd_card.name : "",
 410                 priv->convert_rate);
 411
 412         i = 0;
 413         for_each_child_of_node(node, np) {
 414                 ret = rsrc_card_dai_link_of(node, np, priv, i);
 415                 if (ret < 0)
 416                         return ret;
 417                 i++;
 418         }
 419
 420         if (!priv->snd_card.name)
 421                 priv->snd_card.name = priv->snd_card.dai_link->name;
 422
 423         return 0;
 424 }
 425
 426 /* Decrease the reference count of the device nodes */
 427 static int rsrc_card_unref(struct snd_soc_card *card)
 428 {
 429         struct snd_soc_dai_link *dai_link;
 430         int num_links;
 431
 432         for (num_links = 0, dai_link = card->dai_link;
 433              num_links < card->num_links;
 434              num_links++, dai_link++) {
 435                 of_node_put(dai_link->cpu_of_node);
 436                 of_node_put(dai_link->codec_of_node);
 437         }
 438         return 0;
 439 }
 440
 441 static int rsrc_card_probe(struct platform_device *pdev)
 442 {
 443         struct rsrc_card_priv *priv;
 444         struct device_node *np = pdev->dev.of_node;
 445         struct device *dev = &pdev->dev;
 446         int ret;
 447
 448         /* Allocate the private data */
 449         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 450         if (!priv)
 451                 return -ENOMEM;
 452
 453         ret = rsrc_card_parse_of(np, priv, dev);
 454         if (ret < 0) {
 455                 if (ret != -EPROBE_DEFER)
 456                         dev_err(dev, "parse error %d\n", ret);
 457                 goto err;
 458         }
 459
 460         snd_soc_card_set_drvdata(&priv->snd_card, priv);
 461
 462         ret = devm_snd_soc_register_card(&pdev->dev, &priv->snd_card);
 463         if (ret >= 0)
 464                 return ret;
 465 err:
 466         rsrc_card_unref(&priv->snd_card);
 467
 468         return ret;
 469 }
 470
 471 static int rsrc_card_remove(struct platform_device *pdev)
 472 {
 473         struct snd_soc_card *card = platform_get_drvdata(pdev);
 474
 475         return rsrc_card_unref(card);
 476 }
 477
 478 static struct platform_driver rsrc_card = {
 479         .driver = {
 480                 .name = "renesas-src-audio-card",
 481                 .of_match_table = rsrc_card_of_match,
 482         },
 483         .probe = rsrc_card_probe,
 484         .remove = rsrc_card_remove,
 485 };
 486
 487 module_platform_driver(rsrc_card);
 488
 489 MODULE_ALIAS("platform:renesas-src-audio-card");
 490 MODULE_LICENSE("GPL");
 491 MODULE_DESCRIPTION("Renesas Sampling Rate Convert Sound Card");
 492 MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");