sound/soc/fsl/soc-of-simple.c

   1 /*
   2  * OF helpers for ALSA SoC Layer
   3  *
   4  * Copyright (C) 2008, Secret Lab Technologies Ltd.
   5  */
   6
   7 #include <linux/module.h>
   8 #include <linux/moduleparam.h>
   9 #include <linux/init.h>
  10 #include <linux/delay.h>
  11 #include <linux/pm.h>
  12 #include <linux/bitops.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/of.h>
  15 #include <sound/core.h>
  16 #include <sound/pcm.h>
  17 #include <sound/pcm_params.h>
  18 #include <sound/soc.h>
  19 #include <sound/soc-of-simple.h>
  20 #include <sound/initval.h>
  21
  22 MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
  23 MODULE_LICENSE("GPL");
  24 MODULE_DESCRIPTION("ALSA SoC OpenFirmware bindings");
  25
  26 static DEFINE_MUTEX(of_snd_soc_mutex);
  27 static LIST_HEAD(of_snd_soc_device_list);
  28 static int of_snd_soc_next_index;
  29
  30 struct of_snd_soc_device {
  31         int id;
  32         struct list_head list;
  33         struct snd_soc_device device;
  34         struct snd_soc_card card;
  35         struct snd_soc_dai_link dai_link;
  36         struct platform_device *pdev;
  37         struct device_node *platform_node;
  38         struct device_node *codec_node;
  39 };
  40
  41 static struct snd_soc_ops of_snd_soc_ops = {
  42 };
  43
  44 static struct of_snd_soc_device *
  45 of_snd_soc_get_device(struct device_node *codec_node)
  46 {
  47         struct of_snd_soc_device *of_soc;
  48
  49         list_for_each_entry(of_soc, &of_snd_soc_device_list, list) {
  50                 if (of_soc->codec_node == codec_node)
  51                         return of_soc;
  52         }
  53
  54         of_soc = kzalloc(sizeof(struct of_snd_soc_device), GFP_KERNEL);
  55         if (!of_soc)
  56                 return NULL;
  57
  58         /* Initialize the structure and add it to the global list */
  59         of_soc->codec_node = codec_node;
  60         of_soc->id = of_snd_soc_next_index++;
  61         of_soc->card.dai_link = &of_soc->dai_link;
  62         of_soc->card.num_links = 1;
  63         of_soc->device.card = &of_soc->card;
  64         of_soc->dai_link.ops = &of_snd_soc_ops;
  65         list_add(&of_soc->list, &of_snd_soc_device_list);
  66
  67         return of_soc;
  68 }
  69
  70 static void of_snd_soc_register_device(struct of_snd_soc_device *of_soc)
  71 {
  72         struct platform_device *pdev;
  73         int rc;
  74
  75         /* Only register the device if both the codec and platform have
  76          * been registered */
  77         if ((!of_soc->device.codec_data) || (!of_soc->platform_node))
  78                 return;
  79
  80         pr_info("platform<-->codec match achieved; registering machine\n");
  81
  82         pdev = platform_device_alloc("soc-audio", of_soc->id);
  83         if (!pdev) {
  84                 pr_err("of_soc: platform_device_alloc() failed\n");
  85                 return;
  86         }
  87
  88         pdev->dev.platform_data = of_soc;
  89         platform_set_drvdata(pdev, &of_soc->device);
  90         of_soc->device.dev = &pdev->dev;
  91
  92         /* The ASoC device is complete; register it */
  93         rc = platform_device_add(pdev);
  94         if (rc) {
  95                 pr_err("of_soc: platform_device_add() failed\n");
  96                 return;
  97         }
  98
  99 }
 100
 101 int of_snd_soc_register_codec(struct snd_soc_codec_device *codec_dev,
 102                               void *codec_data, struct snd_soc_dai *dai,
 103                               struct device_node *node)
 104 {
 105         struct of_snd_soc_device *of_soc;
 106         int rc = 0;
 107
 108         pr_info("registering ASoC codec driver: %s\n", node->full_name);
 109
 110         mutex_lock(&of_snd_soc_mutex);
 111         of_soc = of_snd_soc_get_device(node);
 112         if (!of_soc) {
 113                 rc = -ENOMEM;
 114                 goto out;
 115         }
 116
 117         /* Store the codec data */
 118         of_soc->device.codec_data = codec_data;
 119         of_soc->device.codec_dev = codec_dev;
 120         of_soc->dai_link.name = (char *)node->name;
 121         of_soc->dai_link.stream_name = (char *)node->name;
 122         of_soc->dai_link.codec_dai = dai;
 123
 124         /* Now try to register the SoC device */
 125         of_snd_soc_register_device(of_soc);
 126
 127  out:
 128         mutex_unlock(&of_snd_soc_mutex);
 129         return rc;
 130 }
 131 EXPORT_SYMBOL_GPL(of_snd_soc_register_codec);
 132
 133 int of_snd_soc_register_platform(struct snd_soc_platform *platform,
 134                                  struct device_node *node,
 135                                  struct snd_soc_dai *cpu_dai)
 136 {
 137         struct of_snd_soc_device *of_soc;
 138         struct device_node *codec_node;
 139         const phandle *handle;
 140         int len, rc = 0;
 141
 142         pr_info("registering ASoC platform driver: %s\n", node->full_name);
 143
 144         handle = of_get_property(node, "codec-handle", &len);
 145         if (!handle || len < sizeof(handle))
 146                 return -ENODEV;
 147         codec_node = of_find_node_by_phandle(*handle);
 148         if (!codec_node)
 149                 return -ENODEV;
 150         pr_info("looking for codec: %s\n", codec_node->full_name);
 151
 152         mutex_lock(&of_snd_soc_mutex);
 153         of_soc = of_snd_soc_get_device(codec_node);
 154         if (!of_soc) {
 155                 rc = -ENOMEM;
 156                 goto out;
 157         }
 158
 159         of_soc->platform_node = node;
 160         of_soc->dai_link.cpu_dai = cpu_dai;
 161         of_soc->card.platform = platform;
 162         of_soc->card.name = of_soc->dai_link.cpu_dai->name;
 163
 164         /* Now try to register the SoC device */
 165         of_snd_soc_register_device(of_soc);
 166
 167  out:
 168         mutex_unlock(&of_snd_soc_mutex);
 169         return rc;
 170 }
 171 EXPORT_SYMBOL_GPL(of_snd_soc_register_platform);