sound/soc/generic/simple-card.c

   1 /*
   2  * ASoC simple sound card support
   3  *
   4  * Copyright (C) 2012 Renesas Solutions Corp.
   5  * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11 #include <linux/clk.h>
  12 #include <linux/of.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/module.h>
  15 #include <sound/simple_card.h>
  16
  17 #define asoc_simple_get_card_info(p) \
  18         container_of(p->dai_link, struct asoc_simple_card_info, snd_link)
  19
  20 static int __asoc_simple_card_dai_init(struct snd_soc_dai *dai,
  21                                        struct asoc_simple_dai *set,
  22                                        unsigned int daifmt)
  23 {
  24         int ret = 0;
  25
  26         daifmt |= set->fmt;
  27
  28         if (daifmt)
  29                 ret = snd_soc_dai_set_fmt(dai, daifmt);
  30
  31         if (ret == -ENOTSUPP) {
  32                 dev_dbg(dai->dev, "ASoC: set_fmt is not supported\n");
  33                 ret = 0;
  34         }
  35
  36         if (!ret && set->sysclk)
  37                 ret = snd_soc_dai_set_sysclk(dai, 0, set->sysclk, 0);
  38
  39         return ret;
  40 }
  41
  42 static int asoc_simple_card_dai_init(struct snd_soc_pcm_runtime *rtd)
  43 {
  44         struct asoc_simple_card_info *info = asoc_simple_get_card_info(rtd);
  45         struct snd_soc_dai *codec = rtd->codec_dai;
  46         struct snd_soc_dai *cpu = rtd->cpu_dai;
  47         unsigned int daifmt = info->daifmt;
  48         int ret;
  49
  50         ret = __asoc_simple_card_dai_init(codec, &info->codec_dai, daifmt);
  51         if (ret < 0)
  52                 return ret;
  53
  54         ret = __asoc_simple_card_dai_init(cpu, &info->cpu_dai, daifmt);
  55         if (ret < 0)
  56                 return ret;
  57
  58         return 0;
  59 }
  60
  61 static int
  62 asoc_simple_card_sub_parse_of(struct device_node *np,
  63                               struct asoc_simple_dai *dai,
  64                               struct device_node **node)
  65 {
  66         struct clk *clk;
  67         int ret;
  68
  69         /*
  70          * get node via "sound-dai = <&phandle port>"
  71          * it will be used as xxx_of_node on soc_bind_dai_link()
  72          */
  73         *node = of_parse_phandle(np, "sound-dai", 0);
  74         if (!*node)
  75                 return -ENODEV;
  76
  77         /* get dai->name */
  78         ret = snd_soc_of_get_dai_name(np, &dai->name);
  79         if (ret < 0)
  80                 goto parse_error;
  81
  82         /*
  83          * bitclock-inversion, frame-inversion
  84          * bitclock-master,    frame-master
  85          * and specific "format" if it has
  86          */
  87         dai->fmt = snd_soc_of_parse_daifmt(np, NULL);
  88
  89         /*
  90          * dai->sysclk come from
  91          *  "clocks = <&xxx>" (if system has common clock)
  92          *  or "system-clock-frequency = <xxx>"
  93          *  or device's module clock.
  94          */
  95         if (of_property_read_bool(np, "clocks")) {
  96                 clk = of_clk_get(np, 0);
  97                 if (IS_ERR(clk)) {
  98                         ret = PTR_ERR(clk);
  99                         goto parse_error;
 100                 }
 101
 102                 dai->sysclk = clk_get_rate(clk);
 103         } else if (of_property_read_bool(np, "system-clock-frequency")) {
 104                 of_property_read_u32(np,
 105                                      "system-clock-frequency",
 106                                      &dai->sysclk);
 107         } else {
 108                 clk = of_clk_get(*node, 0);
 109                 if (IS_ERR(clk)) {
 110                         ret = PTR_ERR(clk);
 111                         goto parse_error;
 112                 }
 113
 114                 dai->sysclk = clk_get_rate(clk);
 115         }
 116
 117         ret = 0;
 118
 119 parse_error:
 120         of_node_put(*node);
 121
 122         return ret;
 123 }
 124
 125 static int asoc_simple_card_parse_of(struct device_node *node,
 126                                      struct asoc_simple_card_info *info,
 127                                      struct device *dev,
 128                                      struct device_node **of_cpu,
 129                                      struct device_node **of_codec,
 130                                      struct device_node **of_platform)
 131 {
 132         struct device_node *np;
 133         char *name;
 134         int ret;
 135
 136         /* get CPU/CODEC common format via simple-audio-card,format */
 137         info->daifmt = snd_soc_of_parse_daifmt(node, "simple-audio-card,") &
 138                 (SND_SOC_DAIFMT_FORMAT_MASK | SND_SOC_DAIFMT_INV_MASK);
 139
 140         /* DAPM routes */
 141         ret = snd_soc_of_parse_audio_routing(&info->snd_card,
 142                                         "simple-audio-routing");
 143         if (ret)
 144                 return ret;
 145
 146         /* CPU sub-node */
 147         ret = -EINVAL;
 148         np = of_get_child_by_name(node, "simple-audio-card,cpu");
 149         if (np)
 150                 ret = asoc_simple_card_sub_parse_of(np,
 151                                                   &info->cpu_dai,
 152                                                   of_cpu);
 153         if (ret < 0)
 154                 return ret;
 155
 156         /* CODEC sub-node */
 157         ret = -EINVAL;
 158         np = of_get_child_by_name(node, "simple-audio-card,codec");
 159         if (np)
 160                 ret = asoc_simple_card_sub_parse_of(np,
 161                                                   &info->codec_dai,
 162                                                   of_codec);
 163         if (ret < 0)
 164                 return ret;
 165
 166         if (!info->cpu_dai.name || !info->codec_dai.name)
 167                 return -EINVAL;
 168
 169         /* card name is created from CPU/CODEC dai name */
 170         name = devm_kzalloc(dev,
 171                             strlen(info->cpu_dai.name)   +
 172                             strlen(info->codec_dai.name) + 2,
 173                             GFP_KERNEL);
 174         sprintf(name, "%s-%s", info->cpu_dai.name, info->codec_dai.name);
 175         info->name = info->card = name;
 176
 177         /* simple-card assumes platform == cpu */
 178         *of_platform = *of_cpu;
 179
 180         dev_dbg(dev, "card-name : %s\n", info->card);
 181         dev_dbg(dev, "platform : %04x\n", info->daifmt);
 182         dev_dbg(dev, "cpu : %s / %04x / %d\n",
 183                 info->cpu_dai.name,
 184                 info->cpu_dai.fmt,
 185                 info->cpu_dai.sysclk);
 186         dev_dbg(dev, "codec : %s / %04x / %d\n",
 187                 info->codec_dai.name,
 188                 info->codec_dai.fmt,
 189                 info->codec_dai.sysclk);
 190
 191         return 0;
 192 }
 193
 194 static int asoc_simple_card_probe(struct platform_device *pdev)
 195 {
 196         struct asoc_simple_card_info *cinfo;
 197         struct device_node *np = pdev->dev.of_node;
 198         struct device_node *of_cpu, *of_codec, *of_platform;
 199         struct device *dev = &pdev->dev;
 200
 201         cinfo           = NULL;
 202         of_cpu          = NULL;
 203         of_codec        = NULL;
 204         of_platform     = NULL;
 205         if (np && of_device_is_available(np)) {
 206                 cinfo = devm_kzalloc(dev, sizeof(*cinfo), GFP_KERNEL);
 207                 if (cinfo) {
 208                         int ret;
 209                         cinfo->snd_card.dev = &pdev->dev;
 210                         ret = asoc_simple_card_parse_of(np, cinfo, dev,
 211                                                         &of_cpu,
 212                                                         &of_codec,
 213                                                         &of_platform);
 214                         if (ret < 0) {
 215                                 if (ret != -EPROBE_DEFER)
 216                                         dev_err(dev, "parse error %d\n", ret);
 217                                 return ret;
 218                         }
 219                 }
 220         } else {
 221                 cinfo->snd_card.dev = &pdev->dev;
 222                 cinfo = pdev->dev.platform_data;
 223         }
 224
 225         if (!cinfo) {
 226                 dev_err(dev, "no info for asoc-simple-card\n");
 227                 return -EINVAL;
 228         }
 229
 230         if (!cinfo->name        ||
 231             !cinfo->card        ||
 232             !cinfo->codec_dai.name      ||
 233             !(cinfo->codec              || of_codec)    ||
 234             !(cinfo->platform           || of_platform) ||
 235             !(cinfo->cpu_dai.name       || of_cpu)) {
 236                 dev_err(dev, "insufficient asoc_simple_card_info settings\n");
 237                 return -EINVAL;
 238         }
 239
 240         /*
 241          * init snd_soc_dai_link
 242          */
 243         cinfo->snd_link.name            = cinfo->name;
 244         cinfo->snd_link.stream_name     = cinfo->name;
 245         cinfo->snd_link.cpu_dai_name    = cinfo->cpu_dai.name;
 246         cinfo->snd_link.platform_name   = cinfo->platform;
 247         cinfo->snd_link.codec_name      = cinfo->codec;
 248         cinfo->snd_link.codec_dai_name  = cinfo->codec_dai.name;
 249         cinfo->snd_link.cpu_of_node     = of_cpu;
 250         cinfo->snd_link.codec_of_node   = of_codec;
 251         cinfo->snd_link.platform_of_node = of_platform;
 252         cinfo->snd_link.init            = asoc_simple_card_dai_init;
 253
 254         /*
 255          * init snd_soc_card
 256          */
 257         cinfo->snd_card.name            = cinfo->card;
 258         cinfo->snd_card.owner           = THIS_MODULE;
 259         cinfo->snd_card.dai_link        = &cinfo->snd_link;
 260         cinfo->snd_card.num_links       = 1;
 261
 262         return devm_snd_soc_register_card(&pdev->dev, &cinfo->snd_card);
 263 }
 264
 265 static const struct of_device_id asoc_simple_of_match[] = {
 266         { .compatible = "simple-audio-card", },
 267         {},
 268 };
 269 MODULE_DEVICE_TABLE(of, asoc_simple_of_match);
 270
 271 static struct platform_driver asoc_simple_card = {
 272         .driver = {
 273                 .name   = "asoc-simple-card",
 274                 .owner = THIS_MODULE,
 275                 .of_match_table = asoc_simple_of_match,
 276         },
 277         .probe          = asoc_simple_card_probe,
 278 };
 279
 280 module_platform_driver(asoc_simple_card);
 281
 282 MODULE_ALIAS("platform:asoc-simple-card");
 283 MODULE_LICENSE("GPL");
 284 MODULE_DESCRIPTION("ASoC Simple Sound Card");
 285 MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");