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 #include <sound/simple_card_utils.h>
  24
  25 struct rsrc_card_of_data {
  26         const char *prefix;
  27         const struct snd_soc_dapm_route *routes;
  28         int num_routes;
  29 };
  30
  31 static const struct snd_soc_dapm_route routes_ssi0_ak4642[] = {
  32         {"ak4642 Playback", NULL, "DAI0 Playback"},
  33         {"DAI0 Capture", NULL, "ak4642 Capture"},
  34 };
  35
  36 static const struct rsrc_card_of_data routes_of_ssi0_ak4642 = {
  37         .prefix         = "ak4642",
  38         .routes         = routes_ssi0_ak4642,
  39         .num_routes     = ARRAY_SIZE(routes_ssi0_ak4642),
  40 };
  41
  42 static const struct of_device_id rsrc_card_of_match[] = {
  43         { .compatible = "renesas,rsrc-card,lager",      .data = &routes_of_ssi0_ak4642 },
  44         { .compatible = "renesas,rsrc-card,koelsch",    .data = &routes_of_ssi0_ak4642 },
  45         { .compatible = "renesas,rsrc-card", },
  46         {},
  47 };
  48 MODULE_DEVICE_TABLE(of, rsrc_card_of_match);
  49
  50 #define DAI_NAME_NUM    32
  51 struct rsrc_card_dai {
  52         unsigned int sysclk;
  53         unsigned int tx_slot_mask;
  54         unsigned int rx_slot_mask;
  55         int slots;
  56         int slot_width;
  57         struct clk *clk;
  58         char dai_name[DAI_NAME_NUM];
  59 };
  60
  61 #define IDX_CPU         0
  62 #define IDX_CODEC       1
  63 struct rsrc_card_priv {
  64         struct snd_soc_card snd_card;
  65         struct snd_soc_codec_conf codec_conf;
  66         struct rsrc_card_dai *dai_props;
  67         struct snd_soc_dai_link *dai_link;
  68         u32 convert_rate;
  69         u32 convert_channels;
  70 };
  71
  72 #define rsrc_priv_to_dev(priv) ((priv)->snd_card.dev)
  73 #define rsrc_priv_to_link(priv, i) ((priv)->snd_card.dai_link + (i))
  74 #define rsrc_priv_to_props(priv, i) ((priv)->dai_props + (i))
  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->num);
  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->num);
  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->num;
 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         struct snd_interval *channels = hw_param_interval(params,
 149                                                 SNDRV_PCM_HW_PARAM_CHANNELS);
 150
 151         if (priv->convert_rate)
 152                 rate->min =
 153                 rate->max = priv->convert_rate;
 154
 155         if (priv->convert_channels)
 156                 channels->min =
 157                 channels->max = priv->convert_channels;
 158
 159         return 0;
 160 }
 161
 162 static int rsrc_card_parse_links(struct device_node *np,
 163                                  struct rsrc_card_priv *priv,
 164                                  int idx, bool is_fe)
 165 {
 166         struct snd_soc_dai_link *dai_link = rsrc_priv_to_link(priv, idx);
 167         struct rsrc_card_dai *dai_props = rsrc_priv_to_props(priv, idx);
 168         struct of_phandle_args args;
 169         int ret;
 170
 171         /*
 172          * Get node via "sound-dai = <&phandle port>"
 173          * it will be used as xxx_of_node on soc_bind_dai_link()
 174          */
 175         ret = of_parse_phandle_with_args(np, "sound-dai",
 176                                          "#sound-dai-cells", 0, &args);
 177         if (ret)
 178                 return ret;
 179
 180         /* Parse TDM slot */
 181         ret = snd_soc_of_parse_tdm_slot(np,
 182                                         &dai_props->tx_slot_mask,
 183                                         &dai_props->rx_slot_mask,
 184                                         &dai_props->slots,
 185                                         &dai_props->slot_width);
 186         if (ret)
 187                 return ret;
 188
 189         if (is_fe) {
 190                 /* BE is dummy */
 191                 dai_link->codec_of_node         = NULL;
 192                 dai_link->codec_dai_name        = "snd-soc-dummy-dai";
 193                 dai_link->codec_name            = "snd-soc-dummy";
 194
 195                 /* FE settings */
 196                 dai_link->dynamic               = 1;
 197                 dai_link->dpcm_merged_format    = 1;
 198                 dai_link->cpu_of_node           = args.np;
 199                 ret = snd_soc_of_get_dai_name(np, &dai_link->cpu_dai_name);
 200                 if (ret < 0)
 201                         return ret;
 202
 203                 /* set dai_name */
 204                 snprintf(dai_props->dai_name, DAI_NAME_NUM, "fe.%s",
 205                          dai_link->cpu_dai_name);
 206
 207                 /*
 208                  * In soc_bind_dai_link() will check cpu name after
 209                  * of_node matching if dai_link has cpu_dai_name.
 210                  * but, it will never match if name was created by
 211                  * fmt_single_name() remove cpu_dai_name if cpu_args
 212                  * was 0. See:
 213                  *      fmt_single_name()
 214                  *      fmt_multiple_name()
 215                  */
 216                 if (!args.args_count)
 217                         dai_link->cpu_dai_name = NULL;
 218         } else {
 219                 struct device *dev = rsrc_priv_to_dev(priv);
 220                 const struct rsrc_card_of_data *of_data;
 221
 222                 of_data = of_device_get_match_data(dev);
 223
 224                 /* FE is dummy */
 225                 dai_link->cpu_of_node           = NULL;
 226                 dai_link->cpu_dai_name          = "snd-soc-dummy-dai";
 227                 dai_link->cpu_name              = "snd-soc-dummy";
 228
 229                 /* BE settings */
 230                 dai_link->no_pcm                = 1;
 231                 dai_link->be_hw_params_fixup    = rsrc_card_be_hw_params_fixup;
 232                 dai_link->codec_of_node         = args.np;
 233                 ret = snd_soc_of_get_dai_name(np, &dai_link->codec_dai_name);
 234                 if (ret < 0)
 235                         return ret;
 236
 237                 /* additional name prefix */
 238                 if (of_data) {
 239                         priv->codec_conf.of_node = dai_link->codec_of_node;
 240                         priv->codec_conf.name_prefix = of_data->prefix;
 241                 } else {
 242                         snd_soc_of_parse_audio_prefix(&priv->snd_card,
 243                                                       &priv->codec_conf,
 244                                                       dai_link->codec_of_node,
 245                                                       "audio-prefix");
 246                 }
 247
 248                 /* set dai_name */
 249                 snprintf(dai_props->dai_name, DAI_NAME_NUM, "be.%s",
 250                          dai_link->codec_dai_name);
 251         }
 252
 253         /* Simple Card assumes platform == cpu */
 254         dai_link->platform_of_node      = dai_link->cpu_of_node;
 255         dai_link->dpcm_playback         = 1;
 256         dai_link->dpcm_capture          = 1;
 257         dai_link->name                  = dai_props->dai_name;
 258         dai_link->stream_name           = dai_props->dai_name;
 259         dai_link->ops                   = &rsrc_card_ops;
 260         dai_link->init                  = rsrc_card_dai_init;
 261
 262         return 0;
 263 }
 264
 265 static int rsrc_card_parse_clk(struct device_node *np,
 266                                struct rsrc_card_priv *priv,
 267                                int idx, bool is_fe)
 268 {
 269         struct snd_soc_dai_link *dai_link = rsrc_priv_to_link(priv, idx);
 270         struct rsrc_card_dai *dai_props = rsrc_priv_to_props(priv, idx);
 271         struct clk *clk;
 272         struct device_node *of_np = is_fe ?     dai_link->cpu_of_node :
 273                                                 dai_link->codec_of_node;
 274         u32 val;
 275
 276         /*
 277          * Parse dai->sysclk come from "clocks = <&xxx>"
 278          * (if system has common clock)
 279          *  or "system-clock-frequency = <xxx>"
 280          *  or device's module clock.
 281          */
 282         if (of_property_read_bool(np, "clocks")) {
 283                 clk = of_clk_get(np, 0);
 284                 if (IS_ERR(clk))
 285                         return PTR_ERR(clk);
 286
 287                 dai_props->sysclk = clk_get_rate(clk);
 288                 dai_props->clk = clk;
 289         } else if (!of_property_read_u32(np, "system-clock-frequency", &val)) {
 290                 dai_props->sysclk = val;
 291         } else {
 292                 clk = of_clk_get(of_np, 0);
 293                 if (!IS_ERR(clk))
 294                         dai_props->sysclk = clk_get_rate(clk);
 295         }
 296
 297         return 0;
 298 }
 299
 300 static int rsrc_card_dai_sub_link_of(struct device_node *node,
 301                                      struct device_node *np,
 302                                      struct rsrc_card_priv *priv,
 303                                      int idx, bool is_fe)
 304 {
 305         struct device *dev = rsrc_priv_to_dev(priv);
 306         struct snd_soc_dai_link *dai_link = rsrc_priv_to_link(priv, idx);
 307         struct rsrc_card_dai *dai_props = rsrc_priv_to_props(priv, idx);
 308         int ret;
 309
 310         ret = rsrc_card_parse_links(np, priv, idx, is_fe);
 311         if (ret < 0)
 312                 return ret;
 313
 314         ret = rsrc_card_parse_clk(np, priv, idx, is_fe);
 315         if (ret < 0)
 316                 return ret;
 317
 318         dev_dbg(dev, "\t%s / %04x / %d\n",
 319                 dai_props->dai_name,
 320                 dai_link->dai_fmt,
 321                 dai_props->sysclk);
 322
 323         return ret;
 324 }
 325
 326 static int rsrc_card_dai_link_of(struct device_node *node,
 327                                  struct rsrc_card_priv *priv)
 328 {
 329         struct device *dev = rsrc_priv_to_dev(priv);
 330         struct snd_soc_dai_link *dai_link;
 331         struct device_node *np;
 332         unsigned int daifmt = 0;
 333         int ret, i;
 334         bool is_fe;
 335
 336         /* find 1st codec */
 337         i = 0;
 338         for_each_child_of_node(node, np) {
 339                 dai_link = rsrc_priv_to_link(priv, i);
 340
 341                 if (strcmp(np->name, "codec") == 0) {
 342                         ret = asoc_simple_card_parse_daifmt(dev, node, np,
 343                                                             NULL, &daifmt);
 344                         if (ret < 0)
 345                                 return ret;
 346                         break;
 347                 }
 348                 i++;
 349         }
 350
 351         i = 0;
 352         for_each_child_of_node(node, np) {
 353                 dai_link = rsrc_priv_to_link(priv, i);
 354                 dai_link->dai_fmt = daifmt;
 355
 356                 is_fe = false;
 357                 if (strcmp(np->name, "cpu") == 0)
 358                         is_fe = true;
 359
 360                 ret = rsrc_card_dai_sub_link_of(node, np, priv, i, is_fe);
 361                 if (ret < 0)
 362                         return ret;
 363                 i++;
 364         }
 365
 366         return 0;
 367 }
 368
 369 static int rsrc_card_parse_of(struct device_node *node,
 370                               struct rsrc_card_priv *priv,
 371                               struct device *dev)
 372 {
 373         const struct rsrc_card_of_data *of_data = of_device_get_match_data(dev);
 374         struct rsrc_card_dai *props;
 375         struct snd_soc_dai_link *links;
 376         int ret;
 377         int num;
 378
 379         if (!node)
 380                 return -EINVAL;
 381
 382         num = of_get_child_count(node);
 383         props = devm_kzalloc(dev, sizeof(*props) * num, GFP_KERNEL);
 384         links = devm_kzalloc(dev, sizeof(*links) * num, GFP_KERNEL);
 385         if (!props || !links)
 386                 return -ENOMEM;
 387
 388         priv->dai_props = props;
 389         priv->dai_link  = links;
 390
 391         /* Init snd_soc_card */
 392         priv->snd_card.owner                    = THIS_MODULE;
 393         priv->snd_card.dev                      = dev;
 394         priv->snd_card.dai_link                 = priv->dai_link;
 395         priv->snd_card.num_links                = num;
 396         priv->snd_card.codec_conf               = &priv->codec_conf;
 397         priv->snd_card.num_configs              = 1;
 398
 399         if (of_data) {
 400                 priv->snd_card.of_dapm_routes           = of_data->routes;
 401                 priv->snd_card.num_of_dapm_routes       = of_data->num_routes;
 402         } else {
 403                 snd_soc_of_parse_audio_routing(&priv->snd_card,
 404                                                "audio-routing");
 405         }
 406
 407         /* Parse the card name from DT */
 408         snd_soc_of_parse_card_name(&priv->snd_card, "card-name");
 409
 410         /* sampling rate convert */
 411         of_property_read_u32(node, "convert-rate", &priv->convert_rate);
 412
 413         /* channels transfer */
 414         of_property_read_u32(node, "convert-channels", &priv->convert_channels);
 415
 416         dev_dbg(dev, "New rsrc-audio-card: %s\n",
 417                 priv->snd_card.name ? priv->snd_card.name : "");
 418         dev_dbg(dev, "SRC : convert_rate     %d\n", priv->convert_rate);
 419         dev_dbg(dev, "CTU : convert_channels %d\n", priv->convert_channels);
 420
 421         ret = rsrc_card_dai_link_of(node, priv);
 422         if (ret < 0)
 423                 return ret;
 424
 425         if (!priv->snd_card.name)
 426                 priv->snd_card.name = priv->snd_card.dai_link->name;
 427
 428         return 0;
 429 }
 430
 431 /* Decrease the reference count of the device nodes */
 432 static int rsrc_card_unref(struct snd_soc_card *card)
 433 {
 434         struct snd_soc_dai_link *dai_link;
 435         int num_links;
 436
 437         for (num_links = 0, dai_link = card->dai_link;
 438              num_links < card->num_links;
 439              num_links++, dai_link++) {
 440                 of_node_put(dai_link->cpu_of_node);
 441                 of_node_put(dai_link->codec_of_node);
 442         }
 443         return 0;
 444 }
 445
 446 static int rsrc_card_probe(struct platform_device *pdev)
 447 {
 448         struct rsrc_card_priv *priv;
 449         struct device_node *np = pdev->dev.of_node;
 450         struct device *dev = &pdev->dev;
 451         int ret;
 452
 453         /* Allocate the private data */
 454         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 455         if (!priv)
 456                 return -ENOMEM;
 457
 458         ret = rsrc_card_parse_of(np, priv, dev);
 459         if (ret < 0) {
 460                 if (ret != -EPROBE_DEFER)
 461                         dev_err(dev, "parse error %d\n", ret);
 462                 goto err;
 463         }
 464
 465         snd_soc_card_set_drvdata(&priv->snd_card, priv);
 466
 467         ret = devm_snd_soc_register_card(&pdev->dev, &priv->snd_card);
 468         if (ret >= 0)
 469                 return ret;
 470 err:
 471         rsrc_card_unref(&priv->snd_card);
 472
 473         return ret;
 474 }
 475
 476 static int rsrc_card_remove(struct platform_device *pdev)
 477 {
 478         struct snd_soc_card *card = platform_get_drvdata(pdev);
 479
 480         return rsrc_card_unref(card);
 481 }
 482
 483 static struct platform_driver rsrc_card = {
 484         .driver = {
 485                 .name = "renesas-src-audio-card",
 486                 .of_match_table = rsrc_card_of_match,
 487         },
 488         .probe = rsrc_card_probe,
 489         .remove = rsrc_card_remove,
 490 };
 491
 492 module_platform_driver(rsrc_card);
 493
 494 MODULE_ALIAS("platform:renesas-src-audio-card");
 495 MODULE_LICENSE("GPL");
 496 MODULE_DESCRIPTION("Renesas Sampling Rate Convert Sound Card");
 497 MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");