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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/sound/soc/intel/boards/hda_dsp_common.c
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// SPDX-License-Identifier: GPL-2.0-only

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//

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// Copyright(c) 2019 Intel Corporation

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#include <linux/module.h>

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#include <sound/pcm.h>

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#include <sound/soc.h>

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#include <sound/hda_codec.h>

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#include <sound/hda_i915.h>

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#include "../../codecs/hdac_hda.h"

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#include "hda_dsp_common.h"

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#if IS_ENABLED(CONFIG_SND_SOC_SOF_HDA_AUDIO_CODEC)

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/*

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 * Search card topology and return PCM device number

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 * matching Nth HDMI device (zero-based index).

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 */

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static struct snd_pcm *hda_dsp_hdmi_pcm_handle(struct snd_soc_card *card,

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					       int hdmi_idx)

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{

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	struct snd_soc_pcm_runtime *rtd;

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	struct snd_pcm *spcm;

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	int i = 0;

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	for_each_card_rtds(card, rtd) {

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		spcm = rtd->pcm ?

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			rtd->pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].pcm : NULL;

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		if (spcm && strstr(spcm->id, "HDMI")) {

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			if (i == hdmi_idx)

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				return rtd->pcm;

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			++i;

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		}

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	}

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	return NULL;

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}

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/*

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 * Search card topology and register HDMI PCM related controls

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 * to codec driver.

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 */

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int hda_dsp_hdmi_build_controls(struct snd_soc_card *card,

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				struct snd_soc_component *comp)

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{

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	struct hdac_hda_priv *hda_pvt;

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	struct hda_codec *hcodec;

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	struct snd_pcm *spcm;

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	struct hda_pcm *hpcm;

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	int err = 0, i = 0;

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	if (!comp)

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		return -EINVAL;

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	hda_pvt = snd_soc_component_get_drvdata(comp);

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	hcodec = hda_pvt->codec;

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	list_for_each_entry(hpcm, &hcodec->pcm_list_head, list) {

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		spcm = hda_dsp_hdmi_pcm_handle(card, i);

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		if (spcm) {

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			hpcm->pcm = spcm;

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			hpcm->device = spcm->device;

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			dev_dbg(card->dev,

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				"mapping HDMI converter %d to PCM %d (%p)\n",

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				i, hpcm->device, spcm);

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		} else {

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			hpcm->pcm = NULL;

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			hpcm->device = SNDRV_PCM_INVALID_DEVICE;

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			dev_warn(card->dev,

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				 "%s: no PCM in topology for HDMI converter %d\n",

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				 __func__, i);

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		}

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		i++;

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	}

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	snd_hdac_display_power(hcodec->core.bus,

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			       HDA_CODEC_IDX_CONTROLLER, true);

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	err = snd_hda_codec_build_controls(hcodec);

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	if (err < 0)

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		dev_err(card->dev, "unable to create controls %d\n", err);

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	snd_hdac_display_power(hcodec->core.bus,

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			       HDA_CODEC_IDX_CONTROLLER, false);

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	return err;

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}

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EXPORT_SYMBOL_NS(hda_dsp_hdmi_build_controls, "SND_SOC_INTEL_HDA_DSP_COMMON");

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#endif

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MODULE_DESCRIPTION("ASoC Intel HDMI helpers");

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MODULE_LICENSE("GPL");

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