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