sound/soc/generic/simple-scu-card.c

   1 /*
   2  * ASoC simple SCU sound card support
   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 simple_card_data {
  26         struct snd_soc_card snd_card;
  27         struct snd_soc_codec_conf codec_conf;
  28         struct asoc_simple_dai *dai_props;
  29         struct snd_soc_dai_link *dai_link;
  30         u32 convert_rate;
  31         u32 convert_channels;
  32 };
  33
  34 #define simple_priv_to_dev(priv) ((priv)->snd_card.dev)
  35 #define simple_priv_to_link(priv, i) ((priv)->snd_card.dai_link + (i))
  36 #define simple_priv_to_props(priv, i) ((priv)->dai_props + (i))
  37
  38 #define DAI     "sound-dai"
  39 #define CELL    "#sound-dai-cells"
  40 #define PREFIX  "simple-audio-card,"
  41
  42 static int asoc_simple_card_startup(struct snd_pcm_substream *substream)
  43 {
  44         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  45         struct simple_card_data *priv = snd_soc_card_get_drvdata(rtd->card);
  46         struct asoc_simple_dai *dai_props =
  47                 simple_priv_to_props(priv, rtd->num);
  48
  49         return clk_prepare_enable(dai_props->clk);
  50 }
  51
  52 static void asoc_simple_card_shutdown(struct snd_pcm_substream *substream)
  53 {
  54         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  55         struct simple_card_data *priv = snd_soc_card_get_drvdata(rtd->card);
  56         struct asoc_simple_dai *dai_props =
  57                 simple_priv_to_props(priv, rtd->num);
  58
  59         clk_disable_unprepare(dai_props->clk);
  60 }
  61
  62 static const struct snd_soc_ops asoc_simple_card_ops = {
  63         .startup = asoc_simple_card_startup,
  64         .shutdown = asoc_simple_card_shutdown,
  65 };
  66
  67 static int asoc_simple_card_dai_init(struct snd_soc_pcm_runtime *rtd)
  68 {
  69         struct simple_card_data *priv = snd_soc_card_get_drvdata(rtd->card);
  70         struct snd_soc_dai *dai;
  71         struct snd_soc_dai_link *dai_link;
  72         struct asoc_simple_dai *dai_props;
  73         int num = rtd->num;
  74
  75         dai_link        = simple_priv_to_link(priv, num);
  76         dai_props       = simple_priv_to_props(priv, num);
  77         dai             = dai_link->dynamic ?
  78                                 rtd->cpu_dai :
  79                                 rtd->codec_dai;
  80
  81         return asoc_simple_card_init_dai(dai, dai_props);
  82 }
  83
  84 static int asoc_simple_card_be_hw_params_fixup(struct snd_soc_pcm_runtime *rtd,
  85                                         struct snd_pcm_hw_params *params)
  86 {
  87         struct simple_card_data *priv = snd_soc_card_get_drvdata(rtd->card);
  88         struct snd_interval *rate = hw_param_interval(params,
  89                                                       SNDRV_PCM_HW_PARAM_RATE);
  90         struct snd_interval *channels = hw_param_interval(params,
  91                                                 SNDRV_PCM_HW_PARAM_CHANNELS);
  92
  93         if (priv->convert_rate)
  94                 rate->min =
  95                 rate->max = priv->convert_rate;
  96
  97         if (priv->convert_channels)
  98                 channels->min =
  99                 channels->max = priv->convert_channels;
 100
 101         return 0;
 102 }
 103
 104 static int asoc_simple_card_dai_link_of(struct device_node *np,
 105                                         struct simple_card_data *priv,
 106                                         unsigned int daifmt,
 107                                         int idx, bool is_fe)
 108 {
 109         struct device *dev = simple_priv_to_dev(priv);
 110         struct snd_soc_dai_link *dai_link = simple_priv_to_link(priv, idx);
 111         struct asoc_simple_dai *dai_props = simple_priv_to_props(priv, idx);
 112         int ret;
 113
 114         if (is_fe) {
 115                 int is_single_links = 0;
 116
 117                 /* BE is dummy */
 118                 dai_link->codec_of_node         = NULL;
 119                 dai_link->codec_dai_name        = "snd-soc-dummy-dai";
 120                 dai_link->codec_name            = "snd-soc-dummy";
 121
 122                 /* FE settings */
 123                 dai_link->dynamic               = 1;
 124                 dai_link->dpcm_merged_format    = 1;
 125
 126                 ret = asoc_simple_card_parse_cpu(np, dai_link, DAI, CELL,
 127                                                  &is_single_links);
 128                 if (ret)
 129                         return ret;
 130
 131                 ret = asoc_simple_card_parse_clk_cpu(np, dai_link, dai_props);
 132                 if (ret < 0)
 133                         return ret;
 134
 135                 ret = asoc_simple_card_set_dailink_name(dev, dai_link,
 136                                                         "fe.%s",
 137                                                         dai_link->cpu_dai_name);
 138                 if (ret < 0)
 139                         return ret;
 140
 141                 asoc_simple_card_canonicalize_cpu(dai_link, is_single_links);
 142         } else {
 143                 /* FE is dummy */
 144                 dai_link->cpu_of_node           = NULL;
 145                 dai_link->cpu_dai_name          = "snd-soc-dummy-dai";
 146                 dai_link->cpu_name              = "snd-soc-dummy";
 147
 148                 /* BE settings */
 149                 dai_link->no_pcm                = 1;
 150                 dai_link->be_hw_params_fixup    = asoc_simple_card_be_hw_params_fixup;
 151
 152                 ret = asoc_simple_card_parse_codec(np, dai_link, DAI, CELL);
 153                 if (ret < 0)
 154                         return ret;
 155
 156                 ret = asoc_simple_card_parse_clk_codec(np, dai_link, dai_props);
 157                 if (ret < 0)
 158                         return ret;
 159
 160                 ret = asoc_simple_card_set_dailink_name(dev, dai_link,
 161                                                         "be.%s",
 162                                                         dai_link->codec_dai_name);
 163                 if (ret < 0)
 164                         return ret;
 165
 166                 snd_soc_of_parse_audio_prefix(&priv->snd_card,
 167                                               &priv->codec_conf,
 168                                               dai_link->codec_of_node,
 169                                               PREFIX "prefix");
 170         }
 171
 172         ret = snd_soc_of_parse_tdm_slot(np,
 173                                         &dai_props->tx_slot_mask,
 174                                         &dai_props->rx_slot_mask,
 175                                         &dai_props->slots,
 176                                         &dai_props->slot_width);
 177         if (ret)
 178                 return ret;
 179
 180         ret = asoc_simple_card_canonicalize_dailink(dai_link);
 181         if (ret < 0)
 182                 return ret;
 183
 184         dai_link->dai_fmt               = daifmt;
 185         dai_link->dpcm_playback         = 1;
 186         dai_link->dpcm_capture          = 1;
 187         dai_link->ops                   = &asoc_simple_card_ops;
 188         dai_link->init                  = asoc_simple_card_dai_init;
 189
 190         dev_dbg(dev, "\t%s / %04x / %d\n",
 191                 dai_link->name,
 192                 dai_link->dai_fmt,
 193                 dai_props->sysclk);
 194
 195         return 0;
 196 }
 197
 198 static int asoc_simple_card_parse_of(struct device_node *node,
 199                                      struct simple_card_data *priv)
 200
 201 {
 202         struct device *dev = simple_priv_to_dev(priv);
 203         struct device_node *np;
 204         unsigned int daifmt = 0;
 205         bool is_fe;
 206         int ret, i;
 207
 208         if (!node)
 209                 return -EINVAL;
 210
 211         ret = snd_soc_of_parse_audio_routing(&priv->snd_card, PREFIX "routing");
 212         if (ret < 0)
 213                 return ret;
 214
 215         /* sampling rate convert */
 216         of_property_read_u32(node, PREFIX "convert-rate", &priv->convert_rate);
 217
 218         /* channels transfer */
 219         of_property_read_u32(node, PREFIX "convert-channels", &priv->convert_channels);
 220
 221         /* find 1st codec */
 222         np = of_get_child_by_name(node, PREFIX "codec");
 223         if (!np)
 224                 return -ENODEV;
 225
 226         ret = asoc_simple_card_parse_daifmt(dev, node, np, PREFIX, &daifmt);
 227         if (ret < 0)
 228                 return ret;
 229
 230         i = 0;
 231         for_each_child_of_node(node, np) {
 232                 is_fe = false;
 233                 if (strcmp(np->name, PREFIX "cpu") == 0)
 234                         is_fe = true;
 235
 236                 ret = asoc_simple_card_dai_link_of(np, priv, daifmt, i, is_fe);
 237                 if (ret < 0)
 238                         return ret;
 239                 i++;
 240         }
 241
 242         ret = asoc_simple_card_parse_card_name(&priv->snd_card, PREFIX);
 243         if (ret < 0)
 244                 return ret;
 245
 246         dev_dbg(dev, "New card: %s\n",
 247                 priv->snd_card.name ? priv->snd_card.name : "");
 248         dev_dbg(dev, "convert_rate     %d\n", priv->convert_rate);
 249         dev_dbg(dev, "convert_channels %d\n", priv->convert_channels);
 250
 251         return 0;
 252 }
 253
 254 static int asoc_simple_card_probe(struct platform_device *pdev)
 255 {
 256         struct simple_card_data *priv;
 257         struct snd_soc_dai_link *dai_link;
 258         struct asoc_simple_dai *dai_props;
 259         struct device *dev = &pdev->dev;
 260         struct device_node *np = pdev->dev.of_node;
 261         int num, ret;
 262
 263         /* Allocate the private data */
 264         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 265         if (!priv)
 266                 return -ENOMEM;
 267
 268         num = of_get_child_count(np);
 269
 270         dai_props = devm_kzalloc(dev, sizeof(*dai_props) * num, GFP_KERNEL);
 271         dai_link  = devm_kzalloc(dev, sizeof(*dai_link)  * num, GFP_KERNEL);
 272         if (!dai_props || !dai_link)
 273                 return -ENOMEM;
 274
 275         priv->dai_props                         = dai_props;
 276         priv->dai_link                          = dai_link;
 277
 278         /* Init snd_soc_card */
 279         priv->snd_card.owner                    = THIS_MODULE;
 280         priv->snd_card.dev                      = dev;
 281         priv->snd_card.dai_link                 = priv->dai_link;
 282         priv->snd_card.num_links                = num;
 283         priv->snd_card.codec_conf               = &priv->codec_conf;
 284         priv->snd_card.num_configs              = 1;
 285
 286         ret = asoc_simple_card_parse_of(np, priv);
 287         if (ret < 0) {
 288                 if (ret != -EPROBE_DEFER)
 289                         dev_err(dev, "parse error %d\n", ret);
 290                 goto err;
 291         }
 292
 293         snd_soc_card_set_drvdata(&priv->snd_card, priv);
 294
 295         ret = devm_snd_soc_register_card(&pdev->dev, &priv->snd_card);
 296         if (ret >= 0)
 297                 return ret;
 298 err:
 299         asoc_simple_card_clean_reference(&priv->snd_card);
 300
 301         return ret;
 302 }
 303
 304 static int asoc_simple_card_remove(struct platform_device *pdev)
 305 {
 306         struct snd_soc_card *card = platform_get_drvdata(pdev);
 307
 308         return asoc_simple_card_clean_reference(card);
 309 }
 310
 311 static const struct of_device_id asoc_simple_of_match[] = {
 312         { .compatible = "renesas,rsrc-card", },
 313         { .compatible = "simple-scu-audio-card", },
 314         {},
 315 };
 316 MODULE_DEVICE_TABLE(of, asoc_simple_of_match);
 317
 318 static struct platform_driver asoc_simple_card = {
 319         .driver = {
 320                 .name = "simple-scu-audio-card",
 321                 .of_match_table = asoc_simple_of_match,
 322         },
 323         .probe = asoc_simple_card_probe,
 324         .remove = asoc_simple_card_remove,
 325 };
 326
 327 module_platform_driver(asoc_simple_card);
 328
 329 MODULE_ALIAS("platform:asoc-simple-scu-card");
 330 MODULE_LICENSE("GPL v2");
 331 MODULE_DESCRIPTION("ASoC Simple SCU Sound Card");
 332 MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");