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

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// Copyright (c) 2025 Texas Instruments Inc.

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/*

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 *  soc_sdw_ti_amp - Helpers to handle TI's soundwire based codecs

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 */

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#include <linux/device.h>

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#include <linux/errno.h>

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#include <sound/soc.h>

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#include <sound/soc-acpi.h>

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#include <sound/soc-dai.h>

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#include <sound/soc_sdw_utils.h>

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#define TIAMP_SPK_VOLUME_0DB		200

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int asoc_sdw_ti_amp_initial_settings(struct snd_soc_card *card,

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				     const char *name_prefix)

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{

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	char *volume_ctl_name;

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	int ret;

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	volume_ctl_name = kasprintf(GFP_KERNEL, "%s Speaker Volume",

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				    name_prefix);

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	if (!volume_ctl_name)

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		return -ENOMEM;

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	ret = snd_soc_limit_volume(card, volume_ctl_name,

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				   TIAMP_SPK_VOLUME_0DB);

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	if (ret)

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		dev_err(card->dev,

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			"%s update failed %d\n",

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			volume_ctl_name, ret);

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	kfree(volume_ctl_name);

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	return 0;

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}

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EXPORT_SYMBOL_NS(asoc_sdw_ti_amp_initial_settings, "SND_SOC_SDW_UTILS");

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int asoc_sdw_ti_spk_rtd_init(struct snd_soc_pcm_runtime *rtd,

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			     struct snd_soc_dai *dai)

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{

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	struct snd_soc_card *card = rtd->card;

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	struct snd_soc_dapm_context *dapm = snd_soc_card_to_dapm(card);

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	char widget_name[16];

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	char speaker[16];

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	struct snd_soc_dapm_route route = {speaker, NULL, widget_name};

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	struct snd_soc_dai *codec_dai;

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	const char *prefix;

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	int i, ret = 0;

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	for_each_rtd_codec_dais(rtd, i, codec_dai) {

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		if (!strstr(codec_dai->name, "tas2783"))

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			continue;

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		prefix = codec_dai->component->name_prefix;

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		if (!strncmp(prefix, "tas2783-1", strlen("tas2783-1"))) {

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			strscpy(speaker, "Left Spk", sizeof(speaker));

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		} else if (!strncmp(prefix, "tas2783-2", strlen("tas2783-2"))) {

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			strscpy(speaker, "Right Spk", sizeof(speaker));

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		} else if (!strncmp(prefix, "tas2783-3", strlen("tas2783-3"))) {

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			strscpy(speaker, "Left Spk2", sizeof(speaker));

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		} else if (!strncmp(prefix, "tas2783-4", strlen("tas2783-4"))) {

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			strscpy(speaker, "Right Spk2", sizeof(speaker));

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		} else {

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			ret = -EINVAL;

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			dev_err(card->dev, "unhandled prefix %s", prefix);

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			break;

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		}

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		snprintf(widget_name, sizeof(widget_name), "%s SPK", prefix);

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		ret = asoc_sdw_ti_amp_initial_settings(card, prefix);

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		if (ret)

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			return ret;

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		ret = snd_soc_dapm_add_routes(dapm, &route, 1);

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		if (ret)

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			return ret;

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	}

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	return ret;

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}

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EXPORT_SYMBOL_NS(asoc_sdw_ti_spk_rtd_init, "SND_SOC_SDW_UTILS");

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int asoc_sdw_ti_amp_init(struct snd_soc_card *card,

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			 struct snd_soc_dai_link *dai_links,

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			 struct asoc_sdw_codec_info *info,

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			 bool playback)

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{

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	if (!playback)

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		return 0;

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	info->amp_num++;

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	return 0;

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}

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EXPORT_SYMBOL_NS(asoc_sdw_ti_amp_init, "SND_SOC_SDW_UTILS");

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