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