hda_dsp_common.c

// SPDX-License-Identifier: GPL-2.0-only
//
// Copyright(c) 2019 Intel Corporation

#include <linux/module.h>
#include <sound/pcm.h>
#include <sound/soc.h>
#include <sound/hda_codec.h>
#include <sound/hda_i915.h>
#include "../../codecs/hdac_hda.h"

#include "hda_dsp_common.h"

#if IS_ENABLED(CONFIG_SND_SOC_SOF_HDA_AUDIO_CODEC)

/*
 * Search card topology and return PCM device number
 * matching Nth playback HDMI device (zero-based index).
 */
static struct snd_pcm *hda_dsp_hdmi_pcm_handle(struct snd_soc_card *card,
					       int hdmi_idx)
{
	struct snd_soc_pcm_runtime *rtd;
	struct snd_pcm *spcm;
	int i = 0;

	for_each_card_rtds(card, rtd) {
		/* ignore BE PCMs */
		if (rtd->dai_link && rtd->dai_link->no_pcm)
			continue;

		spcm = rtd->pcm;

		/* ignore PCMs with no playback streams */
		if (!spcm || !spcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
			continue;

		/* look for FE PCMs with name "HDMI x" */
		if (spcm && strstr(spcm->id, "HDMI")) {
			if (i == hdmi_idx)
				return rtd->pcm;
			++i;
		}
	}

	return NULL;
}

/*
 * Search card topology and register HDMI PCM related controls
 * to codec driver.
 */
int hda_dsp_hdmi_build_controls(struct snd_soc_card *card,
				struct snd_soc_component *comp)
{
	struct hdac_hda_priv *hda_pvt;
	struct hda_codec *hcodec;
	struct snd_pcm *spcm;
	struct hda_pcm *hpcm;
	int err = 0, i = 0;

	if (!comp)
		return -EINVAL;

	hda_pvt = snd_soc_component_get_drvdata(comp);
	hcodec = hda_pvt->codec;

	list_for_each_entry(hpcm, &hcodec->pcm_list_head, list) {
		spcm = hda_dsp_hdmi_pcm_handle(card, i);
		if (spcm) {
			hpcm->pcm = spcm;
			hpcm->device = spcm->device;
			dev_dbg(card->dev,
				"mapping HDMI converter %d to PCM %d (%p)\n",
				i, hpcm->device, spcm);
		} else {
			hpcm->pcm = NULL;
			hpcm->device = SNDRV_PCM_INVALID_DEVICE;
			dev_warn(card->dev,
				 "%s: no PCM in topology for HDMI converter %d\n",
				 __func__, i);
		}
		i++;
	}
	snd_hdac_display_power(hcodec->core.bus,
			       HDA_CODEC_IDX_CONTROLLER, true);
	err = snd_hda_codec_build_controls(hcodec);
	if (err < 0)
		dev_err(card->dev, "unable to create controls %d\n", err);
	snd_hdac_display_power(hcodec->core.bus,
			       HDA_CODEC_IDX_CONTROLLER, false);

	return err;
}
EXPORT_SYMBOL_NS(hda_dsp_hdmi_build_controls, "SND_SOC_INTEL_HDA_DSP_COMMON");

#endif

MODULE_DESCRIPTION("ASoC Intel HDMI helpers");
MODULE_LICENSE("GPL");