drivers/audio/pcm1681.c - third_party/github/zephyrproject-rtos/zephyr - Git at Google

 /*
  * Copyright (c) 2025 Basalte bv
  *
  * SPDX-License-Identifier: Apache-2.0
  */

 #define DT_DRV_COMPAT ti_pcm1681

 #include <errno.h>

 #include <zephyr/device.h>
 #include <zephyr/audio/codec.h>
 #include <zephyr/drivers/i2c.h>
 #include <zephyr/drivers/spi.h>
 #include <zephyr/logging/log.h>
 #include <zephyr/sys/util.h>

 #include "pcm1681.h"

 LOG_MODULE_REGISTER(pcm1681);

 union pcm1681_bus_spec {
 	struct i2c_dt_spec i2c;
 	struct spi_dt_spec spi;
 };

 typedef bool (*pcm1681_bus_is_ready)(union pcm1681_bus_spec const *bus_spec);
 typedef int (*pcm1681_bus_reg_write)(union pcm1681_bus_spec const *bus_spec, uint8_t reg_addr,
 				     uint8_t value);

 struct pcm1681_bus_io {
 	pcm1681_bus_is_ready is_ready;
 	pcm1681_bus_reg_write reg_write;
 };

 struct pcm1681_config {
 	union pcm1681_bus_spec bus_spec;
 	struct pcm1681_bus_io bus_io;
 };

 struct pcm1681_data {
 	uint8_t reg_map[PCM1681_N_REGISTERS];
 };

 static inline bool pcm1681_reg_is_accessible(uint8_t reg)
 {
 	return !((reg == PCM1681_REG_0) || (reg == PCM1681_REG_15));
 }

 static inline bool pcm1681_reg_is_writeable(uint8_t reg)
 {
 	return pcm1681_reg_is_accessible(reg) && reg != PCM1681_REG_14;
 }

 static inline void pcm1681_reg_update_masked(uint8_t *reg, uint8_t value, uint8_t pos, uint8_t mask)
 {
 	*reg = (*reg & ~mask) | (value << pos);
 }

 static inline void pcm1681_reg_read_masked(uint8_t reg, uint8_t *value, uint8_t pos, uint8_t mask)
 {
 	*value = (reg & mask) >> pos;
 }

 #ifdef CONFIG_AUDIO_CODEC_PCM1681_I2C
 static bool pcm1681_i2c_is_ready(union pcm1681_bus_spec const *bus_spec)
 {
 	return i2c_is_ready_dt(&bus_spec->i2c);
 }

 static int pcm1681_i2c_reg_write(union pcm1681_bus_spec const *bus_spec, uint8_t reg_addr,
 				 uint8_t value)
 {
 	return i2c_reg_write_byte_dt(&bus_spec->i2c, reg_addr, value);
 }
 #endif /* CONFIG_AUDIO_CODEC_PCM1681_I2C */

 #ifdef CONFIG_AUDIO_CODEC_PCM1681_SPI
 static bool pcm1681_spi_is_ready(union pcm1681_bus_spec const *bus_spec)
 {
 	return spi_is_ready_dt(&bus_spec->spi);
 }

 static int pcm1681_spi_reg_write(union pcm1681_bus_spec const *bus_spec, uint8_t reg_addr,
 				 uint8_t value)
 {
 	const struct spi_buf buf[2] = {
 		{
 			.buf = &reg_addr,
 			.len = 1,
 		},
 		{
 			.buf = &value,
 			.len = 1,
 		},
 	};
 	const struct spi_buf_set set = {
 		.buffers = buf,
 		.count = 2,
 	};

 	return spi_write_dt(&bus_spec->spi, &set);
 }
 #endif /* CONFIG_AUDIO_CODEC_PCM1681_SPI */

 static int pcm1681_set_volume(const struct device *dev, uint8_t channel, uint8_t volume)
 {
 	struct pcm1681_data *data = dev->data;
 	uint8_t attenuation;
 	uint8_t dams;
 	uint8_t reg;

 	if (channel == 0 || channel > 8) {
 		LOG_ERR("Invalid channel (%d)", channel);
 		return -EINVAL;
 	}

 	if (volume > 100) {
 		LOG_ERR("Volume > 100 (%d)", volume);
 		return -EINVAL;
 	}

 	/* Get DAMS */
 	pcm1681_reg_read_masked(data->reg_map[PCM1681_DAMS_REG], &dams, PCM1681_DAMS_POS,
 				PCM1681_DAMS_MASK);
 	attenuation = (dams) ? VOL2ATT_WIDE(volume) : VOL2ATT_FINE(volume);

 	switch (channel) {
 	case 7:
 		reg = PCM1681_AT7x_REG;
 		break;
 	case 8:
 		reg = PCM1681_AT8x_REG;
 		break;
 	default:
 		reg = channel;
 		break;
 	}

 	pcm1681_reg_update_masked(&data->reg_map[reg], attenuation, PCM1681_ATxx_POS,
 				  PCM1681_ATxx_MASK);

 	return 0;
 }

 static int pcm1681_set_mute(const struct device *dev, uint8_t channel, bool mute)
 {
 	struct pcm1681_data *data = dev->data;
 	uint8_t pos;
 	uint8_t reg;

 	if (channel == 0 || channel > 8) {
 		LOG_ERR("Invalid channel (%d)", channel);
 		return -EINVAL;
 	}

 	if (channel < 7) {
 		reg = PCM1681_MUTx_REG;
 		pos = channel - 1;
 	} else {
 		/* For channels 7 and 8, we can't write to the traditional register (??) */
 		reg = PCM1681_MUT_OR_REG;
 		pos = channel - 7;
 	}
 	pcm1681_reg_update_masked(&data->reg_map[reg], mute, pos, BIT(pos));

 	return 0;
 }

 static int pcm1681_set_dac(const struct device *dev, uint8_t channel, bool enable)
 {
 	struct pcm1681_data *data = dev->data;
 	uint8_t pos;
 	uint8_t reg;

 	if (channel == 0 || channel > 8) {
 		LOG_ERR("Invalid channel (%d)", channel);
 		return -EINVAL;
 	}

 	if (channel < 7) {
 		reg = PCM1681_DACx_REG;
 		pos = channel - 1;
 	} else {
 		/* For channels 7 and 8, we can't write to the traditional register (??) */
 		reg = PCM1681_DAC_OR_REG;
 		pos = channel - 7;
 	}
 	pcm1681_reg_update_masked(&data->reg_map[reg], !enable, pos, BIT(pos));

 	return 0;
 }

 static int pcm1681_configure(const struct device *dev, struct audio_codec_cfg *cfg)
 {
 	struct pcm1681_data *data = dev->data;

 	if (cfg->dai_type != AUDIO_DAI_TYPE_I2S) {
 		LOG_ERR("Only AUDIO_DAI_TYPE_I2S supported");
 		return -EINVAL;
 	}

 	switch (cfg->dai_cfg.i2s.format) {
 	case I2S_FMT_DATA_FORMAT_I2S:
 		if ((cfg->dai_cfg.i2s.word_size != AUDIO_PCM_WIDTH_16_BITS) &
 		    (cfg->dai_cfg.i2s.word_size != AUDIO_PCM_WIDTH_24_BITS)) {
 			LOG_ERR("Word size %d not supported for i2s", cfg->dai_cfg.i2s.word_size);
 		}
 		pcm1681_reg_update_masked(&data->reg_map[PCM1681_FMTx_REG], PCM1681_FMT_I2S_16_24,
 					  PCM1681_FMTx_POS, PCM1681_FMTx_MASK);
 		break;
 	case I2S_FMT_DATA_FORMAT_LEFT_JUSTIFIED:
 		if ((cfg->dai_cfg.i2s.word_size != AUDIO_PCM_WIDTH_16_BITS) &
 		    (cfg->dai_cfg.i2s.word_size != AUDIO_PCM_WIDTH_24_BITS)) {
 			LOG_ERR("Word size %d not supported for left justified",
 				cfg->dai_cfg.i2s.word_size);
 		}
 		pcm1681_reg_update_masked(&data->reg_map[PCM1681_FMTx_REG],
 					  PCM1681_FMT_LEFT_JUSTIFIED_16_24, PCM1681_FMTx_POS,
 					  PCM1681_FMTx_MASK);
 		break;
 	case I2S_FMT_DATA_FORMAT_RIGHT_JUSTIFIED:
 		if (cfg->dai_cfg.i2s.word_size == AUDIO_PCM_WIDTH_16_BITS) {
 			pcm1681_reg_update_masked(&data->reg_map[PCM1681_FMTx_REG],
 						  PCM1681_FMT_RIGHT_JUSTIFIED_16, PCM1681_FMTx_POS,
 						  PCM1681_FMTx_MASK);
 		} else if (cfg->dai_cfg.i2s.word_size == AUDIO_PCM_WIDTH_24_BITS) {
 			pcm1681_reg_update_masked(&data->reg_map[PCM1681_FMTx_REG],
 						  PCM1681_FMT_RIGHT_JUSTIFIED_24, PCM1681_FMTx_POS,
 						  PCM1681_FMTx_MASK);
 		} else {
 			LOG_ERR("Word size %d not supported for right justified",
 				cfg->dai_cfg.i2s.word_size);
 			return -EINVAL;
 		}
 		break;
 	default:
 		LOG_ERR("I2S format not supported");
 		return -EINVAL;
 	}

 	return audio_codec_apply_properties(dev);
 }

 static void pcm1681_start_output(const struct device *dev)
 {
 	int ret;

 	for (size_t i = 1; i <= PCM1681_N_CHANNELS; i++) {
 		ret = pcm1681_set_dac(dev, i, true);
 		if (ret < 0) {
 			LOG_ERR("Failed to enable channel %d (%d)", i, ret);
 			return;
 		}
 	}

 	(void)audio_codec_apply_properties(dev);
 }

 static void pcm1681_stop_output(const struct device *dev)
 {
 	int ret;

 	for (size_t i = 1; i <= PCM1681_N_CHANNELS; i++) {
 		ret = pcm1681_set_dac(dev, i, false);
 		if (ret < 0) {
 			LOG_ERR("Failed to disable channel %d (%d)", i, ret);
 			return;
 		}
 	}

 	(void)audio_codec_apply_properties(dev);
 }

 static int pcm1681_set_property(const struct device *dev, audio_property_t property,
 				audio_channel_t channel, audio_property_value_t val)
 {
 	int ret;

 	switch (property) {
 	case AUDIO_PROPERTY_OUTPUT_VOLUME:
 		if (channel != AUDIO_CHANNEL_ALL) {
 			LOG_ERR("Volume only supported for all channels");
 			return -EINVAL;
 		}
 		for (size_t i = 1; i <= PCM1681_N_CHANNELS; i++) {
 			ret = pcm1681_set_volume(dev, i, val.vol);
 			if (ret < 0) {
 				LOG_ERR("Failed to set volume for channel %d (%d)", i, ret);
 				return ret;
 			}
 		}
 		break;
 	case AUDIO_PROPERTY_OUTPUT_MUTE:
 		if (channel != AUDIO_CHANNEL_ALL) {
 			LOG_ERR("Mute only supported for all channels");
 			return -EINVAL;
 		}
 		for (size_t i = 1; i <= PCM1681_N_CHANNELS; i++) {
 			ret = pcm1681_set_mute(dev, i, val.mute);
 			if (ret < 0) {
 				LOG_ERR("Failed to set mute for channel %d (%d)", i, ret);
 				return ret;
 			}
 		}
 		break;
 	default:
 		LOG_ERR("Property %d not supported", property);
 		return -EINVAL;
 	}

 	return 0;
 }

 static int pcm1681_apply_properties(const struct device *dev)
 {
 	const struct pcm1681_config *config = dev->config;
 	struct pcm1681_data *data = dev->data;
 	int ret;

 	if (!config->bus_io.is_ready(&config->bus_spec)) {
 		LOG_ERR("Bus not ready");
 		return -ENODEV;
 	}

 	ARRAY_FOR_EACH(data->reg_map, reg) {
 		if (!pcm1681_reg_is_writeable(reg)) {
 			continue;
 		}

 		ret = config->bus_io.reg_write(&config->bus_spec, reg, data->reg_map[reg]);
 		if (ret < 0) {
 			LOG_ERR("Failed to write register %d", ret);
 			return ret;
 		}
 	}

 	return 0;
 }

 static const struct audio_codec_api pcm1681_api = {
 	.configure = pcm1681_configure,
 	.start_output = pcm1681_start_output,
 	.stop_output = pcm1681_stop_output,
 	.set_property = pcm1681_set_property,
 	.apply_properties = pcm1681_apply_properties,
 };

 static int pcm1681_init(const struct device *dev)
 {
 	int ret;

 	/* Reset all registers to their default value */
 	ret = pcm1681_apply_properties(dev);
 	if (ret < 0) {
 		LOG_ERR("Failed to apply default properties (%d)", ret);
 		return ret;
 	}

 	return 0;
 }

 #ifdef CONFIG_AUDIO_CODEC_PCM1681_I2C
 #define PCM1681_CONFIG_I2C(inst)                                                                   \
 	.bus_spec =                                                                                \
 		{                                                                                  \
 			.i2c = I2C_DT_SPEC_INST_GET(inst),                                         \
 	},                                                                                         \
 	.bus_io = {                                                                                \
 		.is_ready = pcm1681_i2c_is_ready,                                                  \
 		.reg_write = pcm1681_i2c_reg_write,                                                \
 	},
 #else
 #define PCM1681_CONFIG_I2C(inst)
 #endif /* CONFIG_AUDIO_CODEC_PCM1681_I2C */

 #ifdef CONFIG_AUDIO_CODEC_PCM1681_SPI
 #define PCM1681_CONFIG_SPI(inst)                                                                   \
 	.bus_spec =                                                                                \
 		{                                                                                  \
 			.spi = SPI_DT_SPEC_INST_GET(inst, SPI_OP_MODE_SLAVE | SPI_WORD_SET(8)),    \
 	},                                                                                         \
 	.bus_io = {                                                                                \
 		.is_ready = pcm1681_spi_is_ready,                                                  \
 		.reg_write = pcm1681_spi_reg_write,                                                \
 	},
 #else
 #define PCM1681_CONFIG_SPI(inst)
 #endif /* CONFIG_AUDIO_CODEC_PCM1681_SPI */

 #define PCM1681_CONFIG(inst)                                                                       \
 	COND_CODE_1(DT_INST_ON_BUS(inst, i2c), (PCM1681_CONFIG_I2C(inst)),                         \
 	(PCM1681_CONFIG_SPI(inst)))

 #define PCM1681_DEFINE(inst)                                                                       \
 	static const struct pcm1681_config pcm1681_##inst##_config = {PCM1681_CONFIG(inst)};       \
                                                                                                    \
 	static struct pcm1681_data pcm1681_##inst##_data = {                                       \
 		.reg_map = PCM1681_DEFAULT_REG_MAP,                                                \
 	};                                                                                         \
                                                                                                    \
 	DEVICE_DT_INST_DEFINE(inst, pcm1681_init, NULL, &pcm1681_##inst##_data,                    \
 			      &pcm1681_##inst##_config, POST_KERNEL,                               \
 			      CONFIG_AUDIO_CODEC_INIT_PRIORITY, &pcm1681_api);

 DT_INST_FOREACH_STATUS_OKAY(PCM1681_DEFINE)
	/*
	* Copyright (c) 2025 Basalte bv
	*
	* SPDX-License-Identifier: Apache-2.0
	*/

	#define DT_DRV_COMPAT ti_pcm1681

	#include <errno.h>

	#include <zephyr/device.h>
	#include <zephyr/audio/codec.h>
	#include <zephyr/drivers/i2c.h>
	#include <zephyr/drivers/spi.h>
	#include <zephyr/logging/log.h>
	#include <zephyr/sys/util.h>

	#include "pcm1681.h"

	LOG_MODULE_REGISTER(pcm1681);

	union pcm1681_bus_spec {
	struct i2c_dt_spec i2c;
	struct spi_dt_spec spi;
	};

	typedef bool (pcm1681_bus_is_ready)(union pcm1681_bus_spec const bus_spec);
	typedef int (pcm1681_bus_reg_write)(union pcm1681_bus_spec const bus_spec, uint8_t reg_addr,
	uint8_t value);

	struct pcm1681_bus_io {
	pcm1681_bus_is_ready is_ready;
	pcm1681_bus_reg_write reg_write;
	};

	struct pcm1681_config {
	union pcm1681_bus_spec bus_spec;
	struct pcm1681_bus_io bus_io;
	};

	struct pcm1681_data {
	uint8_t reg_map[PCM1681_N_REGISTERS];
	};

	static inline bool pcm1681_reg_is_accessible(uint8_t reg)
	{
	return !((reg == PCM1681_REG_0) \|\| (reg == PCM1681_REG_15));
	}

	static inline bool pcm1681_reg_is_writeable(uint8_t reg)
	{
	return pcm1681_reg_is_accessible(reg) && reg != PCM1681_REG_14;
	}

	static inline void pcm1681_reg_update_masked(uint8_t *reg, uint8_t value, uint8_t pos, uint8_t mask)
	{
	reg = (reg & ~mask) \| (value << pos);
	}

	static inline void pcm1681_reg_read_masked(uint8_t reg, uint8_t *value, uint8_t pos, uint8_t mask)
	{
	*value = (reg & mask) >> pos;
	}

	#ifdef CONFIG_AUDIO_CODEC_PCM1681_I2C
	static bool pcm1681_i2c_is_ready(union pcm1681_bus_spec const *bus_spec)
	{
	return i2c_is_ready_dt(&bus_spec->i2c);
	}

	static int pcm1681_i2c_reg_write(union pcm1681_bus_spec const *bus_spec, uint8_t reg_addr,
	uint8_t value)
	{
	return i2c_reg_write_byte_dt(&bus_spec->i2c, reg_addr, value);
	}
	#endif /* CONFIG_AUDIO_CODEC_PCM1681_I2C */

	#ifdef CONFIG_AUDIO_CODEC_PCM1681_SPI
	static bool pcm1681_spi_is_ready(union pcm1681_bus_spec const *bus_spec)
	{
	return spi_is_ready_dt(&bus_spec->spi);
	}

	static int pcm1681_spi_reg_write(union pcm1681_bus_spec const *bus_spec, uint8_t reg_addr,
	uint8_t value)
	{
	const struct spi_buf buf[2] = {
	{
	.buf = &reg_addr,
	.len = 1,
	},
	{
	.buf = &value,
	.len = 1,
	},
	};
	const struct spi_buf_set set = {
	.buffers = buf,
	.count = 2,
	};

	return spi_write_dt(&bus_spec->spi, &set);
	}
	#endif /* CONFIG_AUDIO_CODEC_PCM1681_SPI */

	static int pcm1681_set_volume(const struct device *dev, uint8_t channel, uint8_t volume)
	{
	struct pcm1681_data *data = dev->data;
	uint8_t attenuation;
	uint8_t dams;
	uint8_t reg;

	if (channel == 0 \|\| channel > 8) {
	LOG_ERR("Invalid channel (%d)", channel);
	return -EINVAL;
	}

	if (volume > 100) {
	LOG_ERR("Volume > 100 (%d)", volume);
	return -EINVAL;
	}

	/* Get DAMS */
	pcm1681_reg_read_masked(data->reg_map[PCM1681_DAMS_REG], &dams, PCM1681_DAMS_POS,
	PCM1681_DAMS_MASK);
	attenuation = (dams) ? VOL2ATT_WIDE(volume) : VOL2ATT_FINE(volume);

	switch (channel) {
	case 7:
	reg = PCM1681_AT7x_REG;
	break;
	case 8:
	reg = PCM1681_AT8x_REG;
	break;
	default:
	reg = channel;
	break;
	}

	pcm1681_reg_update_masked(&data->reg_map[reg], attenuation, PCM1681_ATxx_POS,
	PCM1681_ATxx_MASK);

	return 0;
	}

	static int pcm1681_set_mute(const struct device *dev, uint8_t channel, bool mute)
	{
	struct pcm1681_data *data = dev->data;
	uint8_t pos;
	uint8_t reg;

	if (channel == 0 \|\| channel > 8) {
	LOG_ERR("Invalid channel (%d)", channel);
	return -EINVAL;
	}

	if (channel < 7) {
	reg = PCM1681_MUTx_REG;
	pos = channel - 1;
	} else {
	/* For channels 7 and 8, we can't write to the traditional register (??) */
	reg = PCM1681_MUT_OR_REG;
	pos = channel - 7;
	}
	pcm1681_reg_update_masked(&data->reg_map[reg], mute, pos, BIT(pos));

	return 0;
	}

	static int pcm1681_set_dac(const struct device *dev, uint8_t channel, bool enable)
	{
	struct pcm1681_data *data = dev->data;
	uint8_t pos;
	uint8_t reg;

	if (channel == 0 \|\| channel > 8) {
	LOG_ERR("Invalid channel (%d)", channel);
	return -EINVAL;
	}

	if (channel < 7) {
	reg = PCM1681_DACx_REG;
	pos = channel - 1;
	} else {
	/* For channels 7 and 8, we can't write to the traditional register (??) */
	reg = PCM1681_DAC_OR_REG;
	pos = channel - 7;
	}
	pcm1681_reg_update_masked(&data->reg_map[reg], !enable, pos, BIT(pos));

	return 0;
	}

	static int pcm1681_configure(const struct device dev, struct audio_codec_cfg cfg)
	{
	struct pcm1681_data *data = dev->data;

	if (cfg->dai_type != AUDIO_DAI_TYPE_I2S) {
	LOG_ERR("Only AUDIO_DAI_TYPE_I2S supported");
	return -EINVAL;
	}

	switch (cfg->dai_cfg.i2s.format) {
	case I2S_FMT_DATA_FORMAT_I2S:
	if ((cfg->dai_cfg.i2s.word_size != AUDIO_PCM_WIDTH_16_BITS) &
	(cfg->dai_cfg.i2s.word_size != AUDIO_PCM_WIDTH_24_BITS)) {
	LOG_ERR("Word size %d not supported for i2s", cfg->dai_cfg.i2s.word_size);
	}
	pcm1681_reg_update_masked(&data->reg_map[PCM1681_FMTx_REG], PCM1681_FMT_I2S_16_24,
	PCM1681_FMTx_POS, PCM1681_FMTx_MASK);
	break;
	case I2S_FMT_DATA_FORMAT_LEFT_JUSTIFIED:
	if ((cfg->dai_cfg.i2s.word_size != AUDIO_PCM_WIDTH_16_BITS) &
	(cfg->dai_cfg.i2s.word_size != AUDIO_PCM_WIDTH_24_BITS)) {
	LOG_ERR("Word size %d not supported for left justified",
	cfg->dai_cfg.i2s.word_size);
	}
	pcm1681_reg_update_masked(&data->reg_map[PCM1681_FMTx_REG],
	PCM1681_FMT_LEFT_JUSTIFIED_16_24, PCM1681_FMTx_POS,
	PCM1681_FMTx_MASK);
	break;
	case I2S_FMT_DATA_FORMAT_RIGHT_JUSTIFIED:
	if (cfg->dai_cfg.i2s.word_size == AUDIO_PCM_WIDTH_16_BITS) {
	pcm1681_reg_update_masked(&data->reg_map[PCM1681_FMTx_REG],
	PCM1681_FMT_RIGHT_JUSTIFIED_16, PCM1681_FMTx_POS,
	PCM1681_FMTx_MASK);
	} else if (cfg->dai_cfg.i2s.word_size == AUDIO_PCM_WIDTH_24_BITS) {
	pcm1681_reg_update_masked(&data->reg_map[PCM1681_FMTx_REG],
	PCM1681_FMT_RIGHT_JUSTIFIED_24, PCM1681_FMTx_POS,
	PCM1681_FMTx_MASK);
	} else {
	LOG_ERR("Word size %d not supported for right justified",
	cfg->dai_cfg.i2s.word_size);
	return -EINVAL;
	}
	break;
	default:
	LOG_ERR("I2S format not supported");
	return -EINVAL;
	}

	return audio_codec_apply_properties(dev);
	}

	static void pcm1681_start_output(const struct device *dev)
	{
	int ret;

	for (size_t i = 1; i <= PCM1681_N_CHANNELS; i++) {
	ret = pcm1681_set_dac(dev, i, true);
	if (ret < 0) {
	LOG_ERR("Failed to enable channel %d (%d)", i, ret);
	return;
	}
	}

	(void)audio_codec_apply_properties(dev);
	}

	static void pcm1681_stop_output(const struct device *dev)
	{
	int ret;

	for (size_t i = 1; i <= PCM1681_N_CHANNELS; i++) {
	ret = pcm1681_set_dac(dev, i, false);
	if (ret < 0) {
	LOG_ERR("Failed to disable channel %d (%d)", i, ret);
	return;
	}
	}

	(void)audio_codec_apply_properties(dev);
	}

	static int pcm1681_set_property(const struct device *dev, audio_property_t property,
	audio_channel_t channel, audio_property_value_t val)
	{
	int ret;

	switch (property) {
	case AUDIO_PROPERTY_OUTPUT_VOLUME:
	if (channel != AUDIO_CHANNEL_ALL) {
	LOG_ERR("Volume only supported for all channels");
	return -EINVAL;
	}
	for (size_t i = 1; i <= PCM1681_N_CHANNELS; i++) {
	ret = pcm1681_set_volume(dev, i, val.vol);
	if (ret < 0) {
	LOG_ERR("Failed to set volume for channel %d (%d)", i, ret);
	return ret;
	}
	}
	break;
	case AUDIO_PROPERTY_OUTPUT_MUTE:
	if (channel != AUDIO_CHANNEL_ALL) {
	LOG_ERR("Mute only supported for all channels");
	return -EINVAL;
	}
	for (size_t i = 1; i <= PCM1681_N_CHANNELS; i++) {
	ret = pcm1681_set_mute(dev, i, val.mute);
	if (ret < 0) {
	LOG_ERR("Failed to set mute for channel %d (%d)", i, ret);
	return ret;
	}
	}
	break;
	default:
	LOG_ERR("Property %d not supported", property);
	return -EINVAL;
	}

	return 0;
	}

	static int pcm1681_apply_properties(const struct device *dev)
	{
	const struct pcm1681_config *config = dev->config;
	struct pcm1681_data *data = dev->data;
	int ret;

	if (!config->bus_io.is_ready(&config->bus_spec)) {
	LOG_ERR("Bus not ready");
	return -ENODEV;
	}

	ARRAY_FOR_EACH(data->reg_map, reg) {
	if (!pcm1681_reg_is_writeable(reg)) {
	continue;
	}

	ret = config->bus_io.reg_write(&config->bus_spec, reg, data->reg_map[reg]);
	if (ret < 0) {
	LOG_ERR("Failed to write register %d", ret);
	return ret;
	}
	}

	return 0;
	}

	static const struct audio_codec_api pcm1681_api = {
	.configure = pcm1681_configure,
	.start_output = pcm1681_start_output,
	.stop_output = pcm1681_stop_output,
	.set_property = pcm1681_set_property,
	.apply_properties = pcm1681_apply_properties,
	};

	static int pcm1681_init(const struct device *dev)
	{
	int ret;

	/* Reset all registers to their default value */
	ret = pcm1681_apply_properties(dev);
	if (ret < 0) {
	LOG_ERR("Failed to apply default properties (%d)", ret);
	return ret;
	}

	return 0;
	}

	#ifdef CONFIG_AUDIO_CODEC_PCM1681_I2C
	#define PCM1681_CONFIG_I2C(inst) \
	.bus_spec = \
	{ \
	.i2c = I2C_DT_SPEC_INST_GET(inst), \
	}, \
	.bus_io = { \
	.is_ready = pcm1681_i2c_is_ready, \
	.reg_write = pcm1681_i2c_reg_write, \
	},
	#else
	#define PCM1681_CONFIG_I2C(inst)
	#endif /* CONFIG_AUDIO_CODEC_PCM1681_I2C */

	#ifdef CONFIG_AUDIO_CODEC_PCM1681_SPI
	#define PCM1681_CONFIG_SPI(inst) \
	.bus_spec = \
	{ \
	.spi = SPI_DT_SPEC_INST_GET(inst, SPI_OP_MODE_SLAVE \| SPI_WORD_SET(8)), \
	}, \
	.bus_io = { \
	.is_ready = pcm1681_spi_is_ready, \
	.reg_write = pcm1681_spi_reg_write, \
	},
	#else
	#define PCM1681_CONFIG_SPI(inst)
	#endif /* CONFIG_AUDIO_CODEC_PCM1681_SPI */

	#define PCM1681_CONFIG(inst) \
	COND_CODE_1(DT_INST_ON_BUS(inst, i2c), (PCM1681_CONFIG_I2C(inst)), \
	(PCM1681_CONFIG_SPI(inst)))

	#define PCM1681_DEFINE(inst) \
	static const struct pcm1681_config pcm1681_##inst##_config = {PCM1681_CONFIG(inst)}; \
	\
	static struct pcm1681_data pcm1681_##inst##_data = { \
	.reg_map = PCM1681_DEFAULT_REG_MAP, \
	}; \
	\
	DEVICE_DT_INST_DEFINE(inst, pcm1681_init, NULL, &pcm1681_##inst##_data, \
	&pcm1681_##inst##_config, POST_KERNEL, \
	CONFIG_AUDIO_CODEC_INIT_PRIORITY, &pcm1681_api);

	DT_INST_FOREACH_STATUS_OKAY(PCM1681_DEFINE)