linux-4.4.1/snd_soc_new_compress()

参照元†

説明†

• パス: linux-4.4.1/sound/soc/soc-compress.c

• FIXME: これは何？
  • 説明

引数†

• struct snd_soc_pcm_runtime *rtd
  • linux-4.4.1/snd_soc_pcm_runtime
• int num

返り値†

• int

参考†

実装†

/**
 * snd_soc_new_compress - create a new compress.
 *
 * @rtd: The runtime for which we will create compress
 * @num: the device index number (zero based - shared with normal PCMs)
 *
 * Return: 0 for success, else error.
 */
int snd_soc_new_compress(struct snd_soc_pcm_runtime *rtd, int num)
{
        struct snd_soc_codec *codec = rtd->codec;
        struct snd_soc_platform *platform = rtd->platform;
        struct snd_soc_dai *codec_dai = rtd->codec_dai;
        struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
        struct snd_compr *compr;
        struct snd_pcm *be_pcm;
        char new_name[64];
        int ret = 0, direction = 0;
        int playback = 0, capture = 0;

• • linux-4.4.1/snd_soc_codec
  • linux-4.4.1/snd_soc_platform
  • linux-4.4.1/snd_soc_dai
  • linux-4.4.1/snd_compr
  • linux-4.4.1/snd_pcm

        if (rtd->num_codecs > 1) {
                dev_err(rtd->card->dev, "Multicodec not supported for compressed stream\n");
                return -EINVAL;
        }

• • rtd->card は struct snd_soc_card * 型
  • linux-4.4.1/snd_soc_card
  • linux-4.4.1/dev_err()

        /* check client and interface hw capabilities */
        snprintf(new_name, sizeof(new_name), "%s %s-%d",
                        rtd->dai_link->stream_name, codec_dai->name, num);

• • rtd->dai_link は struct snd_soc_dai_link * 型
  • linux-4.4.1/snd_soc_dai_link
  • linux-4.4.1/snprintf()

        if (codec_dai->driver->playback.channels_min)
                playback = 1;
        if (codec_dai->driver->capture.channels_min)
                capture = 1;

        capture = capture && cpu_dai->driver->capture.channels_min;
        playback = playback && cpu_dai->driver->playback.channels_min;

• • codec_dai->driver は 型
  • codec_dai->driver.playback, codec_dai->driver.capture は 型
  • [[linux-4.4.1/]]

        /*
         * Compress devices are unidirectional so only one of the directions
         * should be set, check for that (xor)
         */
        if (playback + capture != 1) {
                dev_err(rtd->card->dev, "Invalid direction for compress P %d, C %d\n",
                                playback, capture);
                return -EINVAL;
        }

        if(playback)
                direction = SND_COMPRESS_PLAYBACK;
        else
                direction = SND_COMPRESS_CAPTURE;

        compr = kzalloc(sizeof(*compr), GFP_KERNEL);
        if (compr == NULL) {
                snd_printk(KERN_ERR "Cannot allocate compr\n");
                return -ENOMEM;
        }

• • linux-4.4.1/kzalloc()
  • linux-4.4.1/snd_printk()

        compr->ops = devm_kzalloc(rtd->card->dev, sizeof(soc_compr_ops),
                                  GFP_KERNEL);
        if (compr->ops == NULL) {
                dev_err(rtd->card->dev, "Cannot allocate compressed ops\n");
                ret = -ENOMEM;
                goto compr_err;
        }

• • rtd->card は struct snd_soc_card * 型
  • linux-4.4.1/snd_soc_card
  • linux-4.4.1/devm_kzalloc()

        if (rtd->dai_link->dynamic) {
                snprintf(new_name, sizeof(new_name), "(%s)",
                        rtd->dai_link->stream_name);

                ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
                                rtd->dai_link->dpcm_playback,
                                rtd->dai_link->dpcm_capture, &be_pcm);
                if (ret < 0) {
                        dev_err(rtd->card->dev, "ASoC: can't create compressed for %s\n",
                                rtd->dai_link->name);
                        goto compr_err;
                }

• • rtd->card は struct snd_soc_card * 型
  • linux-4.4.1/snd_soc_card
  • rtd->dai_link は struct snd_soc_dai_link * 型
  • linux-4.4.1/snd_soc_dai_link
  • linux-4.4.1/snd_pcm_new_internal()

                rtd->pcm = be_pcm;
                rtd->fe_compr = 1;
                if (rtd->dai_link->dpcm_playback)
                        be_pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd;
                else if (rtd->dai_link->dpcm_capture)
                        be_pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd;
                memcpy(compr->ops, &soc_compr_dyn_ops, sizeof(soc_compr_dyn_ops));
        } else
                memcpy(compr->ops, &soc_compr_ops, sizeof(soc_compr_ops));

        /* Add copy callback for not memory mapped DSPs */
        if (platform->driver->compr_ops && platform->driver->compr_ops->copy)
                compr->ops->copy = soc_compr_copy;

        mutex_init(&compr->lock);
        ret = snd_compress_new(rtd->card->snd_card, num, direction, compr);
        if (ret < 0) {
                pr_err("compress asoc: can't create compress for codec %s\n",
                        codec->component.name);
                goto compr_err;
        }

• • be_pcm->streams は struct snd_pcm_str[2] 型
  • linux-4.4.1/snd_pcm_str
  • be_pcm->streams[].substream は struct snd_pcm_substream * 型
  • linux-4.4.1/snd_pcm_substream
  • linux-4.4.1/mutex_init()
  • linux-4.4.1/snd_compress_new()

        /* DAPM dai link stream work */
        INIT_DELAYED_WORK(&rtd->delayed_work, close_delayed_work);

• • linux-4.4.1/INIT_DELAYED_WORK()
  • linux-4.4.1/close_delayed_work()

        rtd->compr = compr;
        compr->private_data = rtd;

        printk(KERN_INFO "compress asoc: %s <-> %s mapping ok\n", codec_dai->name,
                cpu_dai->name);
        return ret;

• • linux-4.4.1/printk()

compr_err:
        kfree(compr);
        return ret;

• • linux-4.4.1/kfree()

}
EXPORT_SYMBOL_GPL(snd_soc_new_compress);

• • linux-4.4.1/EXPORT_SYMBOL_GPL()

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