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         {},
  45 };
  46 MODULE_DEVICE_TABLE(of, rsrc_card_of_match);
  47
  48 #define DAI_NAME_NUM    32
  49 struct rsrc_card_dai {
  50         unsigned int fmt;
  51         unsigned int sysclk;
  52         struct clk *clk;
  53         char dai_name[DAI_NAME_NUM];
  54 };
  55
  56 #define IDX_CPU         0
  57 #define IDX_CODEC       1
  58 struct rsrc_card_priv {
  59         struct snd_soc_card snd_card;
  60         struct snd_soc_codec_conf codec_conf;
  61         struct rsrc_card_dai *dai_props;
  62         struct snd_soc_dai_link *dai_link;
  63         int dai_num;
  64         u32 convert_rate;
  65 };
  66
  67 #define rsrc_priv_to_dev(priv) ((priv)->snd_card.dev)
  68 #define rsrc_priv_to_link(priv, i) ((priv)->snd_card.dai_link + (i))
  69 #define rsrc_priv_to_props(priv, i) ((priv)->dai_props + (i))
  70 #define rsrc_dev_to_of_data(dev) (of_match_device(rsrc_card_of_match, (dev))->data)
  71
  72 static int rsrc_card_startup(struct snd_pcm_substream *substream)
  73 {
  74         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  75         struct rsrc_card_priv *priv =   snd_soc_card_get_drvdata(rtd->card);
  76         struct rsrc_card_dai *dai_props =
  77                 rsrc_priv_to_props(priv, rtd - rtd->card->rtd);
  78
  79         return clk_prepare_enable(dai_props->clk);
  80 }
  81
  82 static void rsrc_card_shutdown(struct snd_pcm_substream *substream)
  83 {
  84         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  85         struct rsrc_card_priv *priv =   snd_soc_card_get_drvdata(rtd->card);
  86         struct rsrc_card_dai *dai_props =
  87                 rsrc_priv_to_props(priv, rtd - rtd->card->rtd);
  88
  89         clk_disable_unprepare(dai_props->clk);
  90 }
  91
  92 static struct snd_soc_ops rsrc_card_ops = {
  93         .startup = rsrc_card_startup,
  94         .shutdown = rsrc_card_shutdown,
  95 };
  96
  97 static int rsrc_card_dai_init(struct snd_soc_pcm_runtime *rtd)
  98 {
  99         struct rsrc_card_priv *priv = snd_soc_card_get_drvdata(rtd->card);
 100         struct snd_soc_dai *dai;
 101         struct snd_soc_dai_link *dai_link;
 102         struct rsrc_card_dai *dai_props;
 103         int num = rtd - rtd->card->rtd;
 104         int ret;
 105
 106         dai_link        = rsrc_priv_to_link(priv, num);
 107         dai_props       = rsrc_priv_to_props(priv, num);
 108         dai             = dai_link->dynamic ?
 109                                 rtd->cpu_dai :
 110                                 rtd->codec_dai;
 111
 112         if (dai_props->fmt) {
 113                 ret = snd_soc_dai_set_fmt(dai, dai_props->fmt);
 114                 if (ret && ret != -ENOTSUPP) {
 115                         dev_err(dai->dev, "set_fmt error\n");
 116                         goto err;
 117                 }
 118         }
 119
 120         if (dai_props->sysclk) {
 121                 ret = snd_soc_dai_set_sysclk(dai, 0, dai_props->sysclk, 0);
 122                 if (ret && ret != -ENOTSUPP) {
 123                         dev_err(dai->dev, "set_sysclk error\n");
 124                         goto err;
 125                 }
 126         }
 127
 128         ret = 0;
 129
 130 err:
 131         return ret;
 132 }
 133
 134 static int rsrc_card_be_hw_params_fixup(struct snd_soc_pcm_runtime *rtd,
 135                                         struct snd_pcm_hw_params *params)
 136 {
 137         struct rsrc_card_priv *priv = snd_soc_card_get_drvdata(rtd->card);
 138         struct snd_interval *rate = hw_param_interval(params,
 139                                                       SNDRV_PCM_HW_PARAM_RATE);
 140
 141         if (!priv->convert_rate)
 142                 return 0;
 143
 144         rate->min = rate->max = priv->convert_rate;
 145
 146         return 0;
 147 }
 148
 149 static int rsrc_card_parse_daifmt(struct device_node *node,
 150                                   struct device_node *np,
 151                                   struct rsrc_card_priv *priv,
 152                                   int idx, bool is_fe)
 153 {
 154         struct rsrc_card_dai *dai_props = rsrc_priv_to_props(priv, idx);
 155         struct device_node *bitclkmaster = NULL;
 156         struct device_node *framemaster = NULL;
 157         struct device_node *codec = is_fe ? NULL : np;
 158         unsigned int daifmt;
 159
 160         daifmt = snd_soc_of_parse_daifmt(node, NULL,
 161                                          &bitclkmaster, &framemaster);
 162         daifmt &= ~SND_SOC_DAIFMT_MASTER_MASK;
 163
 164         if (!bitclkmaster && !framemaster)
 165                 return -EINVAL;
 166
 167         if (codec == bitclkmaster)
 168                 daifmt |= (codec == framemaster) ?
 169                         SND_SOC_DAIFMT_CBM_CFM : SND_SOC_DAIFMT_CBM_CFS;
 170         else
 171                 daifmt |= (codec == framemaster) ?
 172                         SND_SOC_DAIFMT_CBS_CFM : SND_SOC_DAIFMT_CBS_CFS;
 173
 174         dai_props->fmt  = daifmt;
 175
 176         of_node_put(bitclkmaster);
 177         of_node_put(framemaster);
 178
 179         return 0;
 180 }
 181
 182 static int rsrc_card_parse_links(struct device_node *np,
 183                                  struct rsrc_card_priv *priv,
 184                                  int idx, bool is_fe)
 185 {
 186         struct snd_soc_dai_link *dai_link = rsrc_priv_to_link(priv, idx);
 187         struct rsrc_card_dai *dai_props = rsrc_priv_to_props(priv, idx);
 188         struct of_phandle_args args;
 189         int ret;
 190
 191         /*
 192          * Get node via "sound-dai = <&phandle port>"
 193          * it will be used as xxx_of_node on soc_bind_dai_link()
 194          */
 195         ret = of_parse_phandle_with_args(np, "sound-dai",
 196                                          "#sound-dai-cells", 0, &args);
 197         if (ret)
 198                 return ret;
 199
 200         if (is_fe) {
 201                 /* BE is dummy */
 202                 dai_link->codec_of_node         = NULL;
 203                 dai_link->codec_dai_name        = "snd-soc-dummy-dai";
 204                 dai_link->codec_name            = "snd-soc-dummy";
 205
 206                 /* FE settings */
 207                 dai_link->dynamic               = 1;
 208                 dai_link->dpcm_merged_format    = 1;
 209                 dai_link->cpu_of_node           = args.np;
 210                 snd_soc_of_get_dai_name(np, &dai_link->cpu_dai_name);
 211
 212                 /* set dai_name */
 213                 snprintf(dai_props->dai_name, DAI_NAME_NUM, "fe.%s",
 214                          dai_link->cpu_dai_name);
 215
 216                 /*
 217                  * In soc_bind_dai_link() will check cpu name after
 218                  * of_node matching if dai_link has cpu_dai_name.
 219                  * but, it will never match if name was created by
 220                  * fmt_single_name() remove cpu_dai_name if cpu_args
 221                  * was 0. See:
 222                  *      fmt_single_name()
 223                  *      fmt_multiple_name()
 224                  */
 225                 if (!args.args_count)
 226                         dai_link->cpu_dai_name = NULL;
 227         } else {
 228                 struct device *dev = rsrc_priv_to_dev(priv);
 229                 const struct rsrc_card_of_data *of_data;
 230
 231                 of_data = rsrc_dev_to_of_data(dev);
 232
 233                 /* FE is dummy */
 234                 dai_link->cpu_of_node           = NULL;
 235                 dai_link->cpu_dai_name          = "snd-soc-dummy-dai";
 236                 dai_link->cpu_name              = "snd-soc-dummy";
 237
 238                 /* BE settings */
 239                 dai_link->no_pcm                = 1;
 240                 dai_link->be_hw_params_fixup    = rsrc_card_be_hw_params_fixup;
 241                 dai_link->codec_of_node         = args.np;
 242                 snd_soc_of_get_dai_name(np, &dai_link->codec_dai_name);
 243
 244                 /* additional name prefix */
 245                 priv->codec_conf.of_node        = dai_link->codec_of_node;
 246                 priv->codec_conf.name_prefix    = of_data->prefix;
 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_link_of(struct device_node *node,
 301                                  struct device_node *np,
 302                                  struct rsrc_card_priv *priv,
 303                                  int idx)
 304 {
 305         struct device *dev = rsrc_priv_to_dev(priv);
 306         struct rsrc_card_dai *dai_props = rsrc_priv_to_props(priv, idx);
 307         bool is_fe = false;
 308         int ret;
 309
 310         if (0 == strcmp(np->name, "cpu"))
 311                 is_fe = true;
 312
 313         ret = rsrc_card_parse_daifmt(node, np, priv, idx, is_fe);
 314         if (ret < 0)
 315                 return ret;
 316
 317         ret = rsrc_card_parse_links(np, priv, idx, is_fe);
 318         if (ret < 0)
 319                 return ret;
 320
 321         ret = rsrc_card_parse_clk(np, priv, idx, is_fe);
 322         if (ret < 0)
 323                 return ret;
 324
 325         dev_dbg(dev, "\t%s / %04x / %d\n",
 326                 dai_props->dai_name,
 327                 dai_props->fmt,
 328                 dai_props->sysclk);
 329
 330         return ret;
 331 }
 332
 333 static int rsrc_card_parse_of(struct device_node *node,
 334                               struct rsrc_card_priv *priv,
 335                               struct device *dev)
 336 {
 337         const struct rsrc_card_of_data *of_data = rsrc_dev_to_of_data(dev);
 338         struct rsrc_card_dai *props;
 339         struct snd_soc_dai_link *links;
 340         struct device_node *np;
 341         int ret;
 342         int i, num;
 343
 344         if (!node)
 345                 return -EINVAL;
 346
 347         num = of_get_child_count(node);
 348         props = devm_kzalloc(dev, sizeof(*props) * num, GFP_KERNEL);
 349         links = devm_kzalloc(dev, sizeof(*links) * num, GFP_KERNEL);
 350         if (!props || !links)
 351                 return -ENOMEM;
 352
 353         priv->dai_props = props;
 354         priv->dai_link  = links;
 355         priv->dai_num   = num;
 356
 357         /* Init snd_soc_card */
 358         priv->snd_card.owner                    = THIS_MODULE;
 359         priv->snd_card.dev                      = dev;
 360         priv->snd_card.dai_link                 = priv->dai_link;
 361         priv->snd_card.num_links                = num;
 362         priv->snd_card.codec_conf               = &priv->codec_conf;
 363         priv->snd_card.num_configs              = 1;
 364         priv->snd_card.of_dapm_routes           = of_data->routes;
 365         priv->snd_card.num_of_dapm_routes       = of_data->num_routes;
 366
 367         /* Parse the card name from DT */
 368         snd_soc_of_parse_card_name(&priv->snd_card, "card-name");
 369
 370         /* sampling rate convert */
 371         of_property_read_u32(node, "convert-rate", &priv->convert_rate);
 372
 373         dev_dbg(dev, "New rsrc-audio-card: %s (%d)\n",
 374                 priv->snd_card.name ? priv->snd_card.name : "",
 375                 priv->convert_rate);
 376
 377         i = 0;
 378         for_each_child_of_node(node, np) {
 379                 ret = rsrc_card_dai_link_of(node, np, priv, i);
 380                 if (ret < 0)
 381                         return ret;
 382                 i++;
 383         }
 384
 385         if (!priv->snd_card.name)
 386                 priv->snd_card.name = priv->snd_card.dai_link->name;
 387
 388         return 0;
 389 }
 390
 391 /* Decrease the reference count of the device nodes */
 392 static int rsrc_card_unref(struct snd_soc_card *card)
 393 {
 394         struct snd_soc_dai_link *dai_link;
 395         int num_links;
 396
 397         for (num_links = 0, dai_link = card->dai_link;
 398              num_links < card->num_links;
 399              num_links++, dai_link++) {
 400                 of_node_put(dai_link->cpu_of_node);
 401                 of_node_put(dai_link->codec_of_node);
 402         }
 403         return 0;
 404 }
 405
 406 static int rsrc_card_probe(struct platform_device *pdev)
 407 {
 408         struct rsrc_card_priv *priv;
 409         struct device_node *np = pdev->dev.of_node;
 410         struct device *dev = &pdev->dev;
 411         int ret;
 412
 413         /* Allocate the private data */
 414         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 415         if (!priv)
 416                 return -ENOMEM;
 417
 418         ret = rsrc_card_parse_of(np, priv, dev);
 419         if (ret < 0) {
 420                 if (ret != -EPROBE_DEFER)
 421                         dev_err(dev, "parse error %d\n", ret);
 422                 goto err;
 423         }
 424
 425         snd_soc_card_set_drvdata(&priv->snd_card, priv);
 426
 427         ret = devm_snd_soc_register_card(&pdev->dev, &priv->snd_card);
 428         if (ret >= 0)
 429                 return ret;
 430 err:
 431         rsrc_card_unref(&priv->snd_card);
 432
 433         return ret;
 434 }
 435
 436 static int rsrc_card_remove(struct platform_device *pdev)
 437 {
 438         struct snd_soc_card *card = platform_get_drvdata(pdev);
 439
 440         return rsrc_card_unref(card);
 441 }
 442
 443 static struct platform_driver rsrc_card = {
 444         .driver = {
 445                 .name = "renesas-src-audio-card",
 446                 .of_match_table = rsrc_card_of_match,
 447         },
 448         .probe = rsrc_card_probe,
 449         .remove = rsrc_card_remove,
 450 };
 451
 452 module_platform_driver(rsrc_card);
 453
 454 MODULE_ALIAS("platform:renesas-src-audio-card");
 455 MODULE_LICENSE("GPL");
 456 MODULE_DESCRIPTION("Renesas Sampling Rate Convert Sound Card");
 457 MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");