> +static int avs_dai_hda_be_hw_free(struct snd_pcm_substream *substream, struct snd_soc_dai *dai)
> +{
> + struct avs_dma_data *data;
> + struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream);
> + struct hdac_ext_stream *estream;
host_stream, estream, there seems to be multiple naming conventions for the same thing?
> + struct hdac_ext_link *link;
> + struct hda_codec *codec;
> +
> + dev_dbg(dai->dev, "%s: %s\n", __func__, dai->name);
> +
> + data = snd_soc_dai_get_dma_data(dai, substream);
> + if (!data->path)
> + return 0;
> +
> + estream = substream->runtime->private_data;
> + estream->link_prepared = false;
> + avs_path_free(data->path);
> + data->path = NULL;
> +
> + /* clear link <-> stream mapping */
> + codec = dev_to_hda_codec(asoc_rtd_to_codec(rtd, 0)->dev);
> + link = snd_hdac_ext_bus_link_at(&codec->bus->core, codec->core.addr);
> + if (!link)
> + return -EINVAL;
> +
> + if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
> + snd_hdac_ext_link_clear_stream_id(link, estream->hstream.stream_tag);
> +
> + return 0;
> +}
> +static int avs_dai_hda_be_trigger(struct snd_pcm_substream *substream, int cmd,
> + struct snd_soc_dai *dai)
> +{
> + struct hdac_ext_stream *estream;
> + struct avs_dma_data *data;
> + int ret = 0;
> +
> + dev_dbg(dai->dev, "entry %s cmd=%d\n", __func__, cmd);
> +
> + data = snd_soc_dai_get_dma_data(dai, substream);
> + estream = substream->runtime->private_data;
> +
> + switch (cmd) {
> + case SNDRV_PCM_TRIGGER_START:
> + case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
> + snd_hdac_ext_link_stream_start(estream);
> +
> + ret = avs_path_run(data->path, AVS_TPLG_TRIGGER_AUTO);
> + if (ret < 0)
> + dev_err(dai->dev, "run BE path failed: %d\n", ret);
> + break;
> +
> + case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
> + case SNDRV_PCM_TRIGGER_STOP:
> + ret = avs_path_pause(data->path);
> + if (ret < 0)
> + dev_err(dai->dev, "pause BE path failed: %d\n", ret);
> +
> + snd_hdac_ext_link_stream_clear(estream);
> +
> + if (cmd == SNDRV_PCM_TRIGGER_STOP) {
> + ret = avs_path_reset(data->path);
> + if (ret < 0)
> + dev_err(dai->dev, "reset BE path failed: %d\n", ret);
> + }
> + break;
> +
> + default:
> + ret = -EINVAL;
TRIGGER_SUSPEND?
> + break;
> + }
> +
> + return ret;
> +}
> +static const struct snd_soc_component_driver avs_hda_component_driver = {
> + .name = "avs-hda-pcm",
> + .probe = avs_component_hda_probe,
> + .remove = avs_component_hda_remove,
> + .open = avs_component_hda_open,
> + .close = avs_component_hda_close,
> + .pointer = avs_component_pointer,
> + .mmap = avs_component_mmap,
> + .pcm_construct = avs_component_construct,
> + /*
> + * hda platform component's probe() is dependent on
> + * codec->pcm_list_head, it needs to be initialized after codec
> + * component. remove_order is here for completeness sake
> + */
> + .probe_order = SND_SOC_COMP_ORDER_LATE,
> + .remove_order = SND_SOC_COMP_ORDER_EARLY,
> + .module_get_upon_open = 1,
> + .topology_name_prefix = "intel/avs",
> + .non_legacy_dai_naming = true,
needed?
> +};
> +
> +int avs_hda_platform_register(struct avs_dev *adev, const char *name)
> +{
> + return avs_soc_component_register(adev->dev, name,
> + &avs_hda_component_driver, NULL, 0);
> +}
