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
  12 #include <linux/platform_device.h>
  13 #include <linux/module.h>
  14 #include <sound/simple_card.h>
  15
  16 #define asoc_simple_get_card_info(p) \
  17         container_of(p->dai_link, struct asoc_simple_card_info, snd_link)
  18
  19 static int __asoc_simple_card_dai_init(struct snd_soc_dai *dai,
  20                                        struct asoc_simple_dai *set,
  21                                        unsigned int daifmt)
  22 {
  23         int ret = 0;
  24
  25         daifmt |= set->fmt;
  26
  27         if (!ret && daifmt)
  28                 ret = snd_soc_dai_set_fmt(dai, daifmt);
  29
  30         if (!ret && set->sysclk)
  31                 ret = snd_soc_dai_set_sysclk(dai, 0, set->sysclk, 0);
  32
  33         return ret;
  34 }
  35
  36 static int asoc_simple_card_dai_init(struct snd_soc_pcm_runtime *rtd)
  37 {
  38         struct asoc_simple_card_info *info = asoc_simple_get_card_info(rtd);
  39         struct snd_soc_dai *codec = rtd->codec_dai;
  40         struct snd_soc_dai *cpu = rtd->cpu_dai;
  41         unsigned int daifmt = info->daifmt;
  42         int ret;
  43
  44         ret = __asoc_simple_card_dai_init(codec, &info->codec_dai, daifmt);
  45         if (ret < 0)
  46                 return ret;
  47
  48         ret = __asoc_simple_card_dai_init(cpu, &info->cpu_dai, daifmt);
  49         if (ret < 0)
  50                 return ret;
  51
  52         return 0;
  53 }
  54
  55 static int asoc_simple_card_probe(struct platform_device *pdev)
  56 {
  57         struct asoc_simple_card_info *cinfo = pdev->dev.platform_data;
  58         struct device *dev = &pdev->dev;
  59
  60         if (!cinfo) {
  61                 dev_err(dev, "no info for asoc-simple-card\n");
  62                 return -EINVAL;
  63         }
  64
  65         if (!cinfo->name        ||
  66             !cinfo->card        ||
  67             !cinfo->codec       ||
  68             !cinfo->platform    ||
  69             !cinfo->cpu_dai.name ||
  70             !cinfo->codec_dai.name) {
  71                 dev_err(dev, "insufficient asoc_simple_card_info settings\n");
  72                 return -EINVAL;
  73         }
  74
  75         /*
  76          * init snd_soc_dai_link
  77          */
  78         cinfo->snd_link.name            = cinfo->name;
  79         cinfo->snd_link.stream_name     = cinfo->name;
  80         cinfo->snd_link.cpu_dai_name    = cinfo->cpu_dai.name;
  81         cinfo->snd_link.platform_name   = cinfo->platform;
  82         cinfo->snd_link.codec_name      = cinfo->codec;
  83         cinfo->snd_link.codec_dai_name  = cinfo->codec_dai.name;
  84         cinfo->snd_link.init            = asoc_simple_card_dai_init;
  85
  86         /*
  87          * init snd_soc_card
  88          */
  89         cinfo->snd_card.name            = cinfo->card;
  90         cinfo->snd_card.owner           = THIS_MODULE;
  91         cinfo->snd_card.dai_link        = &cinfo->snd_link;
  92         cinfo->snd_card.num_links       = 1;
  93         cinfo->snd_card.dev             = &pdev->dev;
  94
  95         return snd_soc_register_card(&cinfo->snd_card);
  96 }
  97
  98 static int asoc_simple_card_remove(struct platform_device *pdev)
  99 {
 100         struct asoc_simple_card_info *cinfo = pdev->dev.platform_data;
 101
 102         return snd_soc_unregister_card(&cinfo->snd_card);
 103 }
 104
 105 static struct platform_driver asoc_simple_card = {
 106         .driver = {
 107                 .name   = "asoc-simple-card",
 108                 .owner = THIS_MODULE,
 109         },
 110         .probe          = asoc_simple_card_probe,
 111         .remove         = asoc_simple_card_remove,
 112 };
 113
 114 module_platform_driver(asoc_simple_card);
 115
 116 MODULE_ALIAS("platform:asoc-simple-card");
 117 MODULE_LICENSE("GPL");
 118 MODULE_DESCRIPTION("ASoC Simple Sound Card");
 119 MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");