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