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soc-of-simple.c

/*
 * OF helpers for ALSA SoC Layer
 *
 * Copyright (C) 2008, Secret Lab Technologies Ltd.
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/bitops.h>
#include <linux/platform_device.h>
#include <linux/of.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/soc-of-simple.h>
#include <sound/initval.h>

MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("ALSA SoC OpenFirmware bindings");

static DEFINE_MUTEX(of_snd_soc_mutex);
static LIST_HEAD(of_snd_soc_device_list);
static int of_snd_soc_next_index;

struct of_snd_soc_device {
      int id;
      struct list_head list;
      struct snd_soc_device device;
      struct snd_soc_machine machine;
      struct snd_soc_dai_link dai_link;
      struct platform_device *pdev;
      struct device_node *platform_node;
      struct device_node *codec_node;
};

static struct snd_soc_ops of_snd_soc_ops = {
};

static struct of_snd_soc_device *
of_snd_soc_get_device(struct device_node *codec_node)
{
      struct of_snd_soc_device *of_soc;

      list_for_each_entry(of_soc, &of_snd_soc_device_list, list) {
            if (of_soc->codec_node == codec_node)
                  return of_soc;
      }

      of_soc = kzalloc(sizeof(struct of_snd_soc_device), GFP_KERNEL);
      if (!of_soc)
            return NULL;

      /* Initialize the structure and add it to the global list */
      of_soc->codec_node = codec_node;
      of_soc->id = of_snd_soc_next_index++;
      of_soc->machine.dai_link = &of_soc->dai_link;
      of_soc->machine.num_links = 1;
      of_soc->device.machine = &of_soc->machine;
      of_soc->dai_link.ops = &of_snd_soc_ops;
      list_add(&of_soc->list, &of_snd_soc_device_list);

      return of_soc;
}

static void of_snd_soc_register_device(struct of_snd_soc_device *of_soc)
{
      struct platform_device *pdev;
      int rc;

      /* Only register the device if both the codec and platform have
       * been registered */
      if ((!of_soc->device.codec_data) || (!of_soc->platform_node))
            return;

      pr_info("platform<-->codec match achieved; registering machine\n");

      pdev = platform_device_alloc("soc-audio", of_soc->id);
      if (!pdev) {
            pr_err("of_soc: platform_device_alloc() failed\n");
            return;
      }

      pdev->dev.platform_data = of_soc;
      platform_set_drvdata(pdev, &of_soc->device);
      of_soc->device.dev = &pdev->dev;

      /* The ASoC device is complete; register it */
      rc = platform_device_add(pdev);
      if (rc) {
            pr_err("of_soc: platform_device_add() failed\n");
            return;
      }

}

int of_snd_soc_register_codec(struct snd_soc_codec_device *codec_dev,
                        void *codec_data, struct snd_soc_dai *dai,
                        struct device_node *node)
{
      struct of_snd_soc_device *of_soc;
      int rc = 0;

      pr_info("registering ASoC codec driver: %s\n", node->full_name);

      mutex_lock(&of_snd_soc_mutex);
      of_soc = of_snd_soc_get_device(node);
      if (!of_soc) {
            rc = -ENOMEM;
            goto out;
      }

      /* Store the codec data */
      of_soc->device.codec_data = codec_data;
      of_soc->device.codec_dev = codec_dev;
      of_soc->dai_link.name = (char *)node->name;
      of_soc->dai_link.stream_name = (char *)node->name;
      of_soc->dai_link.codec_dai = dai;

      /* Now try to register the SoC device */
      of_snd_soc_register_device(of_soc);

 out:
      mutex_unlock(&of_snd_soc_mutex);
      return rc;
}
EXPORT_SYMBOL_GPL(of_snd_soc_register_codec);

int of_snd_soc_register_platform(struct snd_soc_platform *platform,
                         struct device_node *node,
                         struct snd_soc_dai *cpu_dai)
{
      struct of_snd_soc_device *of_soc;
      struct device_node *codec_node;
      const phandle *handle;
      int len, rc = 0;

      pr_info("registering ASoC platform driver: %s\n", node->full_name);

      handle = of_get_property(node, "codec-handle", &len);
      if (!handle || len < sizeof(handle))
            return -ENODEV;
      codec_node = of_find_node_by_phandle(*handle);
      if (!codec_node)
            return -ENODEV;
      pr_info("looking for codec: %s\n", codec_node->full_name);

      mutex_lock(&of_snd_soc_mutex);
      of_soc = of_snd_soc_get_device(codec_node);
      if (!of_soc) {
            rc = -ENOMEM;
            goto out;
      }

      of_soc->platform_node = node;
      of_soc->dai_link.cpu_dai = cpu_dai;
      of_soc->device.platform = platform;
      of_soc->machine.name = of_soc->dai_link.cpu_dai->name;

      /* Now try to register the SoC device */
      of_snd_soc_register_device(of_soc);

 out:
      mutex_unlock(&of_snd_soc_mutex);
      return rc;
}
EXPORT_SYMBOL_GPL(of_snd_soc_register_platform);

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