sound/soc/intel/boards/sof_sdw_rt_amp.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 // Copyright (c) 2022 Intel Corporation

 /*
  *  sof_sdw_rt_amp - Helpers to handle RT1308/RT1316/RT1318 from generic machine driver
  */

 #include <linux/device.h>
 #include <linux/errno.h>
 #include <sound/control.h>
 #include <sound/soc.h>
 #include <sound/soc-acpi.h>
 #include <sound/soc-dapm.h>
 #include <linux/soundwire/sdw.h>
 #include <linux/soundwire/sdw_type.h>
 #include <linux/dmi.h>
 #include "sof_sdw_common.h"
 #include "sof_sdw_amp_coeff_tables.h"
 #include "../../codecs/rt1308.h"

 #define CODEC_NAME_SIZE	7

 /* choose a larger value to resolve compatibility issues */
 #define RT_AMP_MAX_BQ_REG RT1316_MAX_BQ_REG

 struct rt_amp_platform_data {
 	const unsigned char *bq_params;
 	const unsigned int bq_params_cnt;
 };

 static const struct rt_amp_platform_data dell_0a5d_platform_data = {
 	.bq_params = dell_0a5d_bq_params,
 	.bq_params_cnt = ARRAY_SIZE(dell_0a5d_bq_params),
 };

 static const struct rt_amp_platform_data dell_0b00_platform_data = {
 	.bq_params = dell_0b00_bq_params,
 	.bq_params_cnt = ARRAY_SIZE(dell_0b00_bq_params),
 };

 static const struct dmi_system_id dmi_platform_data[] = {
 	/* CometLake devices */
 	{
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc"),
 			DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "0990")
 		},
 		.driver_data = (void *)&dell_0a5d_platform_data,
 	},
 	{
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc"),
 			DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "098F")
 		},
 		.driver_data = (void *)&dell_0a5d_platform_data,
 	},
 	/* TigerLake devices */
 	{
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc"),
 			DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "0A5D")
 		},
 		.driver_data = (void *)&dell_0a5d_platform_data,
 	},
 	{
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc"),
 			DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "0A5E")
 		},
 		.driver_data = (void *)&dell_0a5d_platform_data,
 	},
 	/* AlderLake devices */
 	{
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc"),
 			DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "0B00")
 		},
 		.driver_data = (void *)&dell_0b00_platform_data,
 	},
 	{
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc"),
 			DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "0B01")
 		},
 		.driver_data = (void *)&dell_0b00_platform_data,
 	},
 	{
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc"),
 			DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "0AFF")
 		},
 		.driver_data = (void *)&dell_0b00_platform_data,
 	},
 	{
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc"),
 			DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "0AFE")
 		},
 		.driver_data = (void *)&dell_0b00_platform_data,
 	},
 	{},
 };

 static int rt_amp_add_device_props(struct device *sdw_dev)
 {
 	struct property_entry props[3] = {};
 	struct fwnode_handle *fwnode;
 	const struct dmi_system_id *dmi_data;
 	const struct rt_amp_platform_data *pdata;
 	unsigned char params[RT_AMP_MAX_BQ_REG];
 	int ret;

 	dmi_data = dmi_first_match(dmi_platform_data);
 	if (!dmi_data)
 		return 0;

 	pdata = dmi_data->driver_data;
 	memcpy(&params, pdata->bq_params, sizeof(unsigned char) * pdata->bq_params_cnt);

 	props[0] = PROPERTY_ENTRY_U8_ARRAY("realtek,bq-params", params);
 	props[1] = PROPERTY_ENTRY_U32("realtek,bq-params-cnt", pdata->bq_params_cnt);

 	fwnode = fwnode_create_software_node(props, NULL);
 	if (IS_ERR(fwnode))
 		return PTR_ERR(fwnode);

 	ret = device_add_software_node(sdw_dev, to_software_node(fwnode));

 	fwnode_handle_put(fwnode);

 	return ret;
 }

 static const struct snd_kcontrol_new rt_amp_controls[] = {
 	SOC_DAPM_PIN_SWITCH("Speaker"),
 };

 static const struct snd_soc_dapm_widget rt_amp_widgets[] = {
 	SND_SOC_DAPM_SPK("Speaker", NULL),
 };

 /*
  * dapm routes for rt1308/rt1316/rt1318 will be registered dynamically
  * according to the number of rt1308/rt1316/rt1318 used. The first two
  * entries will be registered for one codec case, and the last two entries
  * are also registered if two 1308s/1316s/1318s are used.
  */
 static const struct snd_soc_dapm_route rt1308_map[] = {
 	{ "Speaker", NULL, "rt1308-1 SPOL" },
 	{ "Speaker", NULL, "rt1308-1 SPOR" },
 	{ "Speaker", NULL, "rt1308-2 SPOL" },
 	{ "Speaker", NULL, "rt1308-2 SPOR" },
 };

 static const struct snd_soc_dapm_route rt1316_map[] = {
 	{ "Speaker", NULL, "rt1316-1 SPOL" },
 	{ "Speaker", NULL, "rt1316-1 SPOR" },
 	{ "Speaker", NULL, "rt1316-2 SPOL" },
 	{ "Speaker", NULL, "rt1316-2 SPOR" },
 };

 static const struct snd_soc_dapm_route rt1318_map[] = {
 	{ "Speaker", NULL, "rt1318-1 SPOL" },
 	{ "Speaker", NULL, "rt1318-1 SPOR" },
 	{ "Speaker", NULL, "rt1318-2 SPOL" },
 	{ "Speaker", NULL, "rt1318-2 SPOR" },
 };

 static const struct snd_soc_dapm_route *get_codec_name_and_route(struct snd_soc_pcm_runtime *rtd,
 								 char *codec_name)
 {
 	const char *dai_name;

 	dai_name = rtd->dai_link->codecs->dai_name;

 	/* get the codec name */
 	snprintf(codec_name, CODEC_NAME_SIZE, "%s", dai_name);

 	/* choose the right codec's map  */
 	if (strcmp(codec_name, "rt1308") == 0)
 		return rt1308_map;
 	else if (strcmp(codec_name, "rt1316") == 0)
 		return rt1316_map;
 	else
 		return rt1318_map;
 }

 static int first_spk_init(struct snd_soc_pcm_runtime *rtd)
 {
 	struct snd_soc_card *card = rtd->card;
 	const struct snd_soc_dapm_route *rt_amp_map;
 	char codec_name[CODEC_NAME_SIZE];
 	int ret;

 	rt_amp_map = get_codec_name_and_route(rtd, codec_name);

 	card->components = devm_kasprintf(card->dev, GFP_KERNEL,
 					  "%s spk:%s",
 					  card->components, codec_name);
 	if (!card->components)
 		return -ENOMEM;

 	ret = snd_soc_add_card_controls(card, rt_amp_controls,
 					ARRAY_SIZE(rt_amp_controls));
 	if (ret) {
 		dev_err(card->dev, "%s controls addition failed: %d\n", codec_name, ret);
 		return ret;
 	}

 	ret = snd_soc_dapm_new_controls(&card->dapm, rt_amp_widgets,
 					ARRAY_SIZE(rt_amp_widgets));
 	if (ret) {
 		dev_err(card->dev, "%s widgets addition failed: %d\n", codec_name, ret);
 		return ret;
 	}

 	ret = snd_soc_dapm_add_routes(&card->dapm, rt_amp_map, 2);
 	if (ret)
 		dev_err(rtd->dev, "failed to add first SPK map: %d\n", ret);

 	return ret;
 }

 static int second_spk_init(struct snd_soc_pcm_runtime *rtd)
 {
 	struct snd_soc_card *card = rtd->card;
 	const struct snd_soc_dapm_route *rt_amp_map;
 	char codec_name[CODEC_NAME_SIZE];
 	int ret;

 	rt_amp_map = get_codec_name_and_route(rtd, codec_name);

 	ret = snd_soc_dapm_add_routes(&card->dapm, rt_amp_map + 2, 2);
 	if (ret)
 		dev_err(rtd->dev, "failed to add second SPK map: %d\n", ret);

 	return ret;
 }

 static int all_spk_init(struct snd_soc_pcm_runtime *rtd)
 {
 	int ret;

 	ret = first_spk_init(rtd);
 	if (ret)
 		return ret;

 	return second_spk_init(rtd);
 }

 static int rt1308_i2s_hw_params(struct snd_pcm_substream *substream,
 				struct snd_pcm_hw_params *params)
 {
 	struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
 	struct snd_soc_card *card = rtd->card;
 	struct snd_soc_dai *codec_dai = snd_soc_rtd_to_codec(rtd, 0);
 	int clk_id, clk_freq, pll_out;
 	int err;

 	clk_id = RT1308_PLL_S_MCLK;
 	clk_freq = 38400000;

 	pll_out = params_rate(params) * 512;

 	/* Set rt1308 pll */
 	err = snd_soc_dai_set_pll(codec_dai, 0, clk_id, clk_freq, pll_out);
 	if (err < 0) {
 		dev_err(card->dev, "Failed to set RT1308 PLL: %d\n", err);
 		return err;
 	}

 	/* Set rt1308 sysclk */
 	err = snd_soc_dai_set_sysclk(codec_dai, RT1308_FS_SYS_S_PLL, pll_out,
 				     SND_SOC_CLOCK_IN);
 	if (err < 0) {
 		dev_err(card->dev, "Failed to set RT1308 SYSCLK: %d\n", err);
 		return err;
 	}

 	return 0;
 }

 /* machine stream operations */
 struct snd_soc_ops sof_sdw_rt1308_i2s_ops = {
 	.hw_params = rt1308_i2s_hw_params,
 };

 int sof_sdw_rt_amp_exit(struct snd_soc_card *card, struct snd_soc_dai_link *dai_link)
 {
 	struct mc_private *ctx = snd_soc_card_get_drvdata(card);

 	if (ctx->amp_dev1) {
 		device_remove_software_node(ctx->amp_dev1);
 		put_device(ctx->amp_dev1);
 	}

 	if (ctx->amp_dev2) {
 		device_remove_software_node(ctx->amp_dev2);
 		put_device(ctx->amp_dev2);
 	}

 	return 0;
 }

 int sof_sdw_rt_amp_init(struct snd_soc_card *card,
 			const struct snd_soc_acpi_link_adr *link,
 			struct snd_soc_dai_link *dai_links,
 			struct sof_sdw_codec_info *info,
 			bool playback)
 {
 	struct mc_private *ctx = snd_soc_card_get_drvdata(card);
 	struct device *sdw_dev1, *sdw_dev2;
 	int ret;

 	/* Count amp number and do init on playback link only. */
 	if (!playback)
 		return 0;

 	info->amp_num++;
 	if (info->amp_num == 1)
 		dai_links->init = first_spk_init;

 	if (info->amp_num == 2) {
 		sdw_dev1 = bus_find_device_by_name(&sdw_bus_type, NULL, dai_links->codecs[0].name);
 		if (!sdw_dev1)
 			return -EPROBE_DEFER;

 		ret = rt_amp_add_device_props(sdw_dev1);
 		if (ret < 0) {
 			put_device(sdw_dev1);
 			return ret;
 		}
 		ctx->amp_dev1 = sdw_dev1;

 		sdw_dev2 = bus_find_device_by_name(&sdw_bus_type, NULL, dai_links->codecs[1].name);
 		if (!sdw_dev2)
 			return -EPROBE_DEFER;

 		ret = rt_amp_add_device_props(sdw_dev2);
 		if (ret < 0) {
 			put_device(sdw_dev2);
 			return ret;
 		}
 		ctx->amp_dev2 = sdw_dev2;

 		/*
 		 * if two amps are in one dai link, the init function
 		 * in this dai link will be first set for the first speaker,
 		 * and it should be reset to initialize all speakers when
 		 * the second speaker is found.
 		 */
 		if (dai_links->init)
 			dai_links->init = all_spk_init;
 		else
 			dai_links->init = second_spk_init;
 	}

 	return 0;
 }
	// SPDX-License-Identifier: GPL-2.0-only
	// Copyright (c) 2022 Intel Corporation

	/*
	* sof_sdw_rt_amp - Helpers to handle RT1308/RT1316/RT1318 from generic machine driver
	*/

	#include <linux/device.h>
	#include <linux/errno.h>
	#include <sound/control.h>
	#include <sound/soc.h>
	#include <sound/soc-acpi.h>
	#include <sound/soc-dapm.h>
	#include <linux/soundwire/sdw.h>
	#include <linux/soundwire/sdw_type.h>
	#include <linux/dmi.h>
	#include "sof_sdw_common.h"
	#include "sof_sdw_amp_coeff_tables.h"
	#include "../../codecs/rt1308.h"

	#define CODEC_NAME_SIZE 7

	/* choose a larger value to resolve compatibility issues */
	#define RT_AMP_MAX_BQ_REG RT1316_MAX_BQ_REG

	struct rt_amp_platform_data {
	const unsigned char *bq_params;
	const unsigned int bq_params_cnt;
	};

	static const struct rt_amp_platform_data dell_0a5d_platform_data = {
	.bq_params = dell_0a5d_bq_params,
	.bq_params_cnt = ARRAY_SIZE(dell_0a5d_bq_params),
	};

	static const struct rt_amp_platform_data dell_0b00_platform_data = {
	.bq_params = dell_0b00_bq_params,
	.bq_params_cnt = ARRAY_SIZE(dell_0b00_bq_params),
	};

	static const struct dmi_system_id dmi_platform_data[] = {
	/* CometLake devices */
	{
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc"),
	DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "0990")
	},
	.driver_data = (void *)&dell_0a5d_platform_data,
	},
	{
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc"),
	DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "098F")
	},
	.driver_data = (void *)&dell_0a5d_platform_data,
	},
	/* TigerLake devices */
	{
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc"),
	DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "0A5D")
	},
	.driver_data = (void *)&dell_0a5d_platform_data,
	},
	{
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc"),
	DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "0A5E")
	},
	.driver_data = (void *)&dell_0a5d_platform_data,
	},
	/* AlderLake devices */
	{
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc"),
	DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "0B00")
	},
	.driver_data = (void *)&dell_0b00_platform_data,
	},
	{
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc"),
	DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "0B01")
	},
	.driver_data = (void *)&dell_0b00_platform_data,
	},
	{
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc"),
	DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "0AFF")
	},
	.driver_data = (void *)&dell_0b00_platform_data,
	},
	{
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc"),
	DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "0AFE")
	},
	.driver_data = (void *)&dell_0b00_platform_data,
	},
	{},
	};

	static int rt_amp_add_device_props(struct device *sdw_dev)
	{
	struct property_entry props[3] = {};
	struct fwnode_handle *fwnode;
	const struct dmi_system_id *dmi_data;
	const struct rt_amp_platform_data *pdata;
	unsigned char params[RT_AMP_MAX_BQ_REG];
	int ret;

	dmi_data = dmi_first_match(dmi_platform_data);
	if (!dmi_data)
	return 0;

	pdata = dmi_data->driver_data;
	memcpy(&params, pdata->bq_params, sizeof(unsigned char) * pdata->bq_params_cnt);

	props[0] = PROPERTY_ENTRY_U8_ARRAY("realtek,bq-params", params);
	props[1] = PROPERTY_ENTRY_U32("realtek,bq-params-cnt", pdata->bq_params_cnt);

	fwnode = fwnode_create_software_node(props, NULL);
	if (IS_ERR(fwnode))
	return PTR_ERR(fwnode);

	ret = device_add_software_node(sdw_dev, to_software_node(fwnode));

	fwnode_handle_put(fwnode);

	return ret;
	}

	static const struct snd_kcontrol_new rt_amp_controls[] = {
	SOC_DAPM_PIN_SWITCH("Speaker"),
	};

	static const struct snd_soc_dapm_widget rt_amp_widgets[] = {
	SND_SOC_DAPM_SPK("Speaker", NULL),
	};

	/*
	* dapm routes for rt1308/rt1316/rt1318 will be registered dynamically
	* according to the number of rt1308/rt1316/rt1318 used. The first two
	* entries will be registered for one codec case, and the last two entries
	* are also registered if two 1308s/1316s/1318s are used.
	*/
	static const struct snd_soc_dapm_route rt1308_map[] = {
	{ "Speaker", NULL, "rt1308-1 SPOL" },
	{ "Speaker", NULL, "rt1308-1 SPOR" },
	{ "Speaker", NULL, "rt1308-2 SPOL" },
	{ "Speaker", NULL, "rt1308-2 SPOR" },
	};

	static const struct snd_soc_dapm_route rt1316_map[] = {
	{ "Speaker", NULL, "rt1316-1 SPOL" },
	{ "Speaker", NULL, "rt1316-1 SPOR" },
	{ "Speaker", NULL, "rt1316-2 SPOL" },
	{ "Speaker", NULL, "rt1316-2 SPOR" },
	};

	static const struct snd_soc_dapm_route rt1318_map[] = {
	{ "Speaker", NULL, "rt1318-1 SPOL" },
	{ "Speaker", NULL, "rt1318-1 SPOR" },
	{ "Speaker", NULL, "rt1318-2 SPOL" },
	{ "Speaker", NULL, "rt1318-2 SPOR" },
	};

	static const struct snd_soc_dapm_route get_codec_name_and_route(struct snd_soc_pcm_runtime rtd,
	char *codec_name)
	{
	const char *dai_name;

	dai_name = rtd->dai_link->codecs->dai_name;

	/* get the codec name */
	snprintf(codec_name, CODEC_NAME_SIZE, "%s", dai_name);

	/* choose the right codec's map */
	if (strcmp(codec_name, "rt1308") == 0)
	return rt1308_map;
	else if (strcmp(codec_name, "rt1316") == 0)
	return rt1316_map;
	else
	return rt1318_map;
	}

	static int first_spk_init(struct snd_soc_pcm_runtime *rtd)
	{
	struct snd_soc_card *card = rtd->card;
	const struct snd_soc_dapm_route *rt_amp_map;
	char codec_name[CODEC_NAME_SIZE];
	int ret;

	rt_amp_map = get_codec_name_and_route(rtd, codec_name);

	card->components = devm_kasprintf(card->dev, GFP_KERNEL,
	"%s spk:%s",
	card->components, codec_name);
	if (!card->components)
	return -ENOMEM;

	ret = snd_soc_add_card_controls(card, rt_amp_controls,
	ARRAY_SIZE(rt_amp_controls));
	if (ret) {
	dev_err(card->dev, "%s controls addition failed: %d\n", codec_name, ret);
	return ret;
	}

	ret = snd_soc_dapm_new_controls(&card->dapm, rt_amp_widgets,
	ARRAY_SIZE(rt_amp_widgets));
	if (ret) {
	dev_err(card->dev, "%s widgets addition failed: %d\n", codec_name, ret);
	return ret;
	}

	ret = snd_soc_dapm_add_routes(&card->dapm, rt_amp_map, 2);
	if (ret)
	dev_err(rtd->dev, "failed to add first SPK map: %d\n", ret);

	return ret;
	}

	static int second_spk_init(struct snd_soc_pcm_runtime *rtd)
	{
	struct snd_soc_card *card = rtd->card;
	const struct snd_soc_dapm_route *rt_amp_map;
	char codec_name[CODEC_NAME_SIZE];
	int ret;

	rt_amp_map = get_codec_name_and_route(rtd, codec_name);

	ret = snd_soc_dapm_add_routes(&card->dapm, rt_amp_map + 2, 2);
	if (ret)
	dev_err(rtd->dev, "failed to add second SPK map: %d\n", ret);

	return ret;
	}

	static int all_spk_init(struct snd_soc_pcm_runtime *rtd)
	{
	int ret;

	ret = first_spk_init(rtd);
	if (ret)
	return ret;

	return second_spk_init(rtd);
	}

	static int rt1308_i2s_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params)
	{
	struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
	struct snd_soc_card *card = rtd->card;
	struct snd_soc_dai *codec_dai = snd_soc_rtd_to_codec(rtd, 0);
	int clk_id, clk_freq, pll_out;
	int err;

	clk_id = RT1308_PLL_S_MCLK;
	clk_freq = 38400000;

	pll_out = params_rate(params) * 512;

	/* Set rt1308 pll */
	err = snd_soc_dai_set_pll(codec_dai, 0, clk_id, clk_freq, pll_out);
	if (err < 0) {
	dev_err(card->dev, "Failed to set RT1308 PLL: %d\n", err);
	return err;
	}

	/* Set rt1308 sysclk */
	err = snd_soc_dai_set_sysclk(codec_dai, RT1308_FS_SYS_S_PLL, pll_out,
	SND_SOC_CLOCK_IN);
	if (err < 0) {
	dev_err(card->dev, "Failed to set RT1308 SYSCLK: %d\n", err);
	return err;
	}

	return 0;
	}

	/* machine stream operations */
	struct snd_soc_ops sof_sdw_rt1308_i2s_ops = {
	.hw_params = rt1308_i2s_hw_params,
	};

	int sof_sdw_rt_amp_exit(struct snd_soc_card card, struct snd_soc_dai_link dai_link)
	{
	struct mc_private *ctx = snd_soc_card_get_drvdata(card);

	if (ctx->amp_dev1) {
	device_remove_software_node(ctx->amp_dev1);
	put_device(ctx->amp_dev1);
	}

	if (ctx->amp_dev2) {
	device_remove_software_node(ctx->amp_dev2);
	put_device(ctx->amp_dev2);
	}

	return 0;
	}

	int sof_sdw_rt_amp_init(struct snd_soc_card *card,
	const struct snd_soc_acpi_link_adr *link,
	struct snd_soc_dai_link *dai_links,
	struct sof_sdw_codec_info *info,
	bool playback)
	{
	struct mc_private *ctx = snd_soc_card_get_drvdata(card);
	struct device sdw_dev1, sdw_dev2;
	int ret;

	/* Count amp number and do init on playback link only. */
	if (!playback)
	return 0;

	info->amp_num++;
	if (info->amp_num == 1)
	dai_links->init = first_spk_init;

	if (info->amp_num == 2) {
	sdw_dev1 = bus_find_device_by_name(&sdw_bus_type, NULL, dai_links->codecs[0].name);
	if (!sdw_dev1)
	return -EPROBE_DEFER;

	ret = rt_amp_add_device_props(sdw_dev1);
	if (ret < 0) {
	put_device(sdw_dev1);
	return ret;
	}
	ctx->amp_dev1 = sdw_dev1;

	sdw_dev2 = bus_find_device_by_name(&sdw_bus_type, NULL, dai_links->codecs[1].name);
	if (!sdw_dev2)
	return -EPROBE_DEFER;

	ret = rt_amp_add_device_props(sdw_dev2);
	if (ret < 0) {
	put_device(sdw_dev2);
	return ret;
	}
	ctx->amp_dev2 = sdw_dev2;

	/*
	* if two amps are in one dai link, the init function
	* in this dai link will be first set for the first speaker,
	* and it should be reset to initialize all speakers when
	* the second speaker is found.
	*/
	if (dai_links->init)
	dai_links->init = all_spk_init;
	else
	dai_links->init = second_spk_init;
	}

	return 0;
	}