drivers/adc/adc_mcux_adc16.c - third_party/github/zephyrproject-rtos/zephyr - Git at Google

 /*
  * Copyright (c) 2017-2018, 2020, NXP
  *
  * SPDX-License-Identifier: Apache-2.0
  */

 #define DT_DRV_COMPAT nxp_kinetis_adc16

 #include <errno.h>
 #include <zephyr/drivers/adc.h>
 #include <zephyr/drivers/pinctrl.h>
 #ifdef CONFIG_ADC_MCUX_ADC16_ENABLE_EDMA
 #include <zephyr/drivers/dma.h>
 #endif

 #include <fsl_adc16.h>

 #define LOG_LEVEL CONFIG_ADC_LOG_LEVEL
 #include <zephyr/logging/log.h>
 #include <zephyr/irq.h>
 LOG_MODULE_REGISTER(adc_mcux_adc16);

 #define ADC_CONTEXT_USES_KERNEL_TIMER
 #include "adc_context.h"

 struct mcux_adc16_config {
 	ADC_Type *base;
 #ifndef CONFIG_ADC_MCUX_ADC16_ENABLE_EDMA
 	void (*irq_config_func)(const struct device *dev);
 #endif
 	uint32_t clk_source;	/* ADC clock source selection */
 	uint32_t long_sample;	/* ADC long sample mode selection */
 	uint32_t hw_trigger_src;  /* ADC hardware trigger source */
 				/* defined in SIM module SOPT7 */
 #ifdef CONFIG_ADC_MCUX_ADC16_ENABLE_EDMA
 	uint32_t dma_slot;	/* ADC DMA MUX slot */
 #endif
 	uint32_t trg_offset;
 	uint32_t trg_bits;
 	uint32_t alt_offset;
 	uint32_t alt_bits;
 	bool periodic_trigger; /* ADC enable periodic trigger */
 	bool channel_mux_b;
 	bool high_speed;	/* ADC enable high speed mode*/
 	bool continuous_convert; /* ADC enable continuous convert*/
 	const struct pinctrl_dev_config *pincfg;
 };

 #ifdef CONFIG_ADC_MCUX_ADC16_ENABLE_EDMA
 struct adc_edma_config {
 	int32_t state;
 	uint32_t dma_channel;
 	void (*irq_call_back)(void);
 	struct dma_config dma_cfg;
 	struct dma_block_config dma_block;
 };
 #endif

 struct mcux_adc16_data {
 	const struct device *dev;
 	struct adc_context ctx;
 #ifdef CONFIG_ADC_MCUX_ADC16_ENABLE_EDMA
 	const struct device *dev_dma;
 	struct adc_edma_config adc_dma_config;
 #endif
 	uint16_t *buffer;
 	uint16_t *repeat_buffer;
 	uint32_t channels;
 	uint8_t channel_id;
 };

 #ifdef CONFIG_ADC_MCUX_ADC16_HW_TRIGGER
 #define SIM_SOPT7_ADCSET(x, shifts, mask)                                      \
 	(((uint32_t)(((uint32_t)(x)) << shifts)) & mask)
 #endif

 #ifdef CONFIG_ADC_MCUX_ADC16_ENABLE_EDMA
 static void adc_dma_callback(const struct device *dma_dev, void *callback_arg,
 			     uint32_t channel, int status)
 {
 	const struct device *dev = (const struct device *)callback_arg;
 	struct mcux_adc16_data *data = dev->data;

 	LOG_DBG("DMA done");
 	data->buffer++;
 	adc_context_on_sampling_done(&data->ctx, dev);
 }
 #endif

 #ifdef CONFIG_ADC_MCUX_ADC16_HW_TRIGGER
 static void adc_hw_trigger_enable(const struct device *dev)
 {
 	const struct mcux_adc16_config *config = dev->config;

 	/* enable ADC trigger channel */
 	SIM->SOPT7 |= SIM_SOPT7_ADCSET(config->hw_trigger_src,
 				       config->trg_offset, config->trg_bits) |
 		      SIM_SOPT7_ADCSET(1, config->alt_offset, config->alt_bits);
 }
 #endif

 static int mcux_adc16_channel_setup(const struct device *dev,
 				    const struct adc_channel_cfg *channel_cfg)
 {
 	uint8_t channel_id = channel_cfg->channel_id;

 	if (channel_id > (ADC_SC1_ADCH_MASK >> ADC_SC1_ADCH_SHIFT)) {
 		LOG_ERR("Channel %d is not valid", channel_id);
 		return -EINVAL;
 	}

 	if (channel_cfg->acquisition_time != ADC_ACQ_TIME_DEFAULT) {
 		LOG_ERR("Invalid channel acquisition time");
 		return -EINVAL;
 	}

 	if (channel_cfg->differential) {
 		LOG_ERR("Differential channels are not supported");
 		return -EINVAL;
 	}

 	if (channel_cfg->gain != ADC_GAIN_1) {
 		LOG_ERR("Invalid channel gain");
 		return -EINVAL;
 	}

 #ifdef CONFIG_ADC_MCUX_ADC16_HW_TRIGGER
 	adc_hw_trigger_enable(dev);
 #endif

 	return 0;
 }

 static int start_read(const struct device *dev,
 		      const struct adc_sequence *sequence)
 {
 	const struct mcux_adc16_config *config = dev->config;
 	struct mcux_adc16_data *data = dev->data;
 	adc16_hardware_average_mode_t mode;
 	adc16_resolution_t resolution;
 	int error;
 	uint32_t tmp32;
 	ADC_Type *base = config->base;

 	switch (sequence->resolution) {
 	case 8:
 	case 9:
 		resolution = kADC16_Resolution8or9Bit;
 		break;
 	case 10:
 	case 11:
 		resolution = kADC16_Resolution10or11Bit;
 		break;
 	case 12:
 	case 13:
 		resolution = kADC16_Resolution12or13Bit;
 		break;
 #if defined(FSL_FEATURE_ADC16_MAX_RESOLUTION) &&                               \
 	(FSL_FEATURE_ADC16_MAX_RESOLUTION >= 16U)
 	case 16:
 		resolution = kADC16_Resolution16Bit;
 		break;
 #endif
 	default:
 		LOG_ERR("Invalid resolution");
 		return -EINVAL;
 	}

 	tmp32 = base->CFG1 & ~(ADC_CFG1_MODE_MASK);
 	tmp32 |= ADC_CFG1_MODE(resolution);
 	base->CFG1 = tmp32;

 	switch (sequence->oversampling) {
 	case 0:
 		mode = kADC16_HardwareAverageDisabled;
 		break;
 	case 2:
 		mode = kADC16_HardwareAverageCount4;
 		break;
 	case 3:
 		mode = kADC16_HardwareAverageCount8;
 		break;
 	case 4:
 		mode = kADC16_HardwareAverageCount16;
 		break;
 	case 5:
 		mode = kADC16_HardwareAverageCount32;
 		break;
 	default:
 		LOG_ERR("Invalid oversampling");
 		return -EINVAL;
 	}
 	ADC16_SetHardwareAverage(config->base, mode);

 	if (sequence->buffer_size < 2) {
 		LOG_ERR("sequence buffer size too small %d < 2", sequence->buffer_size);
 		return -EINVAL;
 	}

 	if (sequence->options) {
 		if (sequence->buffer_size <
 			2 * (sequence->options->extra_samplings + 1)) {
 			LOG_ERR("sequence buffer size too small < 2 * extra + 2");
 			return -EINVAL;
 		}
 	}

 	data->buffer = sequence->buffer;

 	adc_context_start_read(&data->ctx, sequence);

 	error = adc_context_wait_for_completion(&data->ctx);
 #ifdef CONFIG_ADC_MCUX_ADC16_ENABLE_EDMA
 	dma_stop(data->dev_dma, data->adc_dma_config.dma_channel);
 #endif
 	return error;
 }

 static int mcux_adc16_read(const struct device *dev,
 			   const struct adc_sequence *sequence)
 {
 	struct mcux_adc16_data *data = dev->data;
 	int error;

 	adc_context_lock(&data->ctx, false, NULL);
 	error = start_read(dev, sequence);
 	adc_context_release(&data->ctx, error);

 	return error;
 }

 #ifdef CONFIG_ADC_ASYNC
 static int mcux_adc16_read_async(const struct device *dev,
 				 const struct adc_sequence *sequence,
 				 struct k_poll_signal *async)
 {
 	struct mcux_adc16_data *data = dev->data;
 	int error;

 	adc_context_lock(&data->ctx, true, async);
 	error = start_read(dev, sequence);
 	adc_context_release(&data->ctx, error);

 	return error;
 }
 #endif

 static void mcux_adc16_start_channel(const struct device *dev)
 {
 	const struct mcux_adc16_config *config = dev->config;
 	struct mcux_adc16_data *data = dev->data;

 	adc16_channel_config_t channel_config;
 	uint32_t channel_group = 0U;

 	data->channel_id = find_lsb_set(data->channels) - 1;

 	LOG_DBG("Starting channel %d", data->channel_id);

 #if defined(FSL_FEATURE_ADC16_HAS_DIFF_MODE) && FSL_FEATURE_ADC16_HAS_DIFF_MODE
 	channel_config.enableDifferentialConversion = false;
 #endif
 	channel_config.enableInterruptOnConversionCompleted = true;
 	channel_config.channelNumber = data->channel_id;
 	ADC16_SetChannelConfig(config->base, channel_group, &channel_config);
 #ifdef CONFIG_ADC_MCUX_ADC16_ENABLE_EDMA
 	LOG_DBG("Starting EDMA");
 	dma_start(data->dev_dma, data->adc_dma_config.dma_channel);
 #endif
 	LOG_DBG("Starting channel done");
 }

 static void adc_context_start_sampling(struct adc_context *ctx)
 {
 	struct mcux_adc16_data *data =
 		CONTAINER_OF(ctx, struct mcux_adc16_data, ctx);

 	data->channels = ctx->sequence.channels;
 	data->repeat_buffer = data->buffer;

 #ifdef CONFIG_ADC_MCUX_ADC16_ENABLE_EDMA
 	LOG_DBG("config dma");
 	data->adc_dma_config.dma_block.block_size = 2;
 	data->adc_dma_config.dma_block.dest_address = (uint32_t)data->buffer;
 	data->adc_dma_config.dma_cfg.head_block =
 		&(data->adc_dma_config.dma_block);
 	dma_config(data->dev_dma, data->adc_dma_config.dma_channel,
 		   &data->adc_dma_config.dma_cfg);
 #endif

 	mcux_adc16_start_channel(data->dev);
 }

 static void adc_context_update_buffer_pointer(struct adc_context *ctx,
 					      bool repeat_sampling)
 {
 	struct mcux_adc16_data *data =
 		CONTAINER_OF(ctx, struct mcux_adc16_data, ctx);

 	if (repeat_sampling) {
 		data->buffer = data->repeat_buffer;
 	}
 }

 #ifndef CONFIG_ADC_MCUX_ADC16_ENABLE_EDMA
 static void mcux_adc16_isr(const struct device *dev)
 {
 	const struct mcux_adc16_config *config = dev->config;
 	struct mcux_adc16_data *data = dev->data;
 	ADC_Type *base = config->base;
 	uint32_t channel_group = 0U;
 	uint16_t result;

 	result = ADC16_GetChannelConversionValue(base, channel_group);
 	LOG_DBG("Finished channel %d. Result is 0x%04x", data->channel_id,
 		result);

 	*data->buffer++ = result;
 	data->channels &= ~BIT(data->channel_id);

 	if (data->channels) {
 		mcux_adc16_start_channel(dev);
 	} else {
 		adc_context_on_sampling_done(&data->ctx, dev);
 	}
 }
 #endif

 static int mcux_adc16_init(const struct device *dev)
 {
 	const struct mcux_adc16_config *config = dev->config;
 	struct mcux_adc16_data *data = dev->data;
 	ADC_Type *base = config->base;
 	adc16_config_t adc_config;
 	int err;

 	LOG_DBG("init adc");
 	ADC16_GetDefaultConfig(&adc_config);

 #ifdef CONFIG_ADC_MCUX_ADC16_ENABLE_EDMA
 	adc_config.clockSource = (adc16_clock_source_t)config->clk_source;
 	adc_config.longSampleMode =
 		(adc16_long_sample_mode_t)config->long_sample;
 	adc_config.enableHighSpeed = config->high_speed;
 	adc_config.enableContinuousConversion = config->continuous_convert;
 #endif

 #if CONFIG_ADC_MCUX_ADC16_VREF_DEFAULT
 	adc_config.referenceVoltageSource = kADC16_ReferenceVoltageSourceVref;
 #else /* CONFIG_ADC_MCUX_ADC16_VREF_ALTERNATE */
 	adc_config.referenceVoltageSource = kADC16_ReferenceVoltageSourceValt;
 #endif

 #if CONFIG_ADC_MCUX_ADC16_CLK_DIV_RATIO_1
 	adc_config.clockDivider = kADC16_ClockDivider1;
 #elif CONFIG_ADC_MCUX_ADC16_CLK_DIV_RATIO_2
 	adc_config.clockDivider = kADC16_ClockDivider2;
 #elif CONFIG_ADC_MCUX_ADC16_CLK_DIV_RATIO_4
 	adc_config.clockDivider = kADC16_ClockDivider4;
 #else /* CONFIG_ADC_MCUX_ADC16_CLK_DIV_RATIO_8 */
 	adc_config.clockDivider = kADC16_ClockDivider8;
 #endif

 	ADC16_Init(base, &adc_config);
 #if defined(FSL_FEATURE_ADC16_HAS_CALIBRATION) && \
 	    FSL_FEATURE_ADC16_HAS_CALIBRATION
 	ADC16_SetHardwareAverage(base, kADC16_HardwareAverageCount32);
 	ADC16_DoAutoCalibration(base);
 #endif
 	if (config->channel_mux_b) {
 		ADC16_SetChannelMuxMode(base, kADC16_ChannelMuxB);
 	}

 	if (IS_ENABLED(CONFIG_ADC_MCUX_ADC16_HW_TRIGGER)) {
 		ADC16_EnableHardwareTrigger(base, true);
 	} else {
 		ADC16_EnableHardwareTrigger(base, false);
 	}

 	err = pinctrl_apply_state(config->pincfg, PINCTRL_STATE_DEFAULT);
 	if (err != 0) {
 		return err;
 	}

 	data->dev = dev;

 	/* dma related init */
 #ifdef CONFIG_ADC_MCUX_ADC16_ENABLE_EDMA
 	/* Enable DMA. */
 	ADC16_EnableDMA(base, true);
 	data->adc_dma_config.dma_cfg.block_count = 1U;
 	data->adc_dma_config.dma_cfg.dma_slot = config->dma_slot;
 	data->adc_dma_config.dma_cfg.channel_direction = PERIPHERAL_TO_MEMORY;
 	data->adc_dma_config.dma_cfg.source_burst_length = 2U;
 	data->adc_dma_config.dma_cfg.dest_burst_length = 2U;
 	data->adc_dma_config.dma_cfg.channel_priority = 0U;
 	data->adc_dma_config.dma_cfg.dma_callback = adc_dma_callback;
 	data->adc_dma_config.dma_cfg.user_data = (void *)dev;

 	data->adc_dma_config.dma_cfg.source_data_size = 2U;
 	data->adc_dma_config.dma_cfg.dest_data_size = 2U;
 	data->adc_dma_config.dma_block.source_address = (uint32_t)&base->R[0];

 	if (data->dev_dma == NULL || !device_is_ready(data->dev_dma)) {
 		LOG_ERR("dma binding fail");
 		return -EINVAL;
 	}

 	if (config->periodic_trigger) {
 		enum dma_channel_filter adc_filter = DMA_CHANNEL_PERIODIC;

 		data->adc_dma_config.dma_channel =
 			dma_request_channel(data->dev_dma, (void *)&adc_filter);
 	} else {
 		enum dma_channel_filter adc_filter = DMA_CHANNEL_NORMAL;

 		data->adc_dma_config.dma_channel =
 			dma_request_channel(data->dev_dma, (void *)&adc_filter);
 	}
 	if (data->adc_dma_config.dma_channel == -EINVAL) {
 		LOG_ERR("can not allocate dma channel");
 		return -EINVAL;
 	}
 	LOG_DBG("dma allocated channel %d", data->adc_dma_config.dma_channel);
 #else
 	config->irq_config_func(dev);
 #endif
 	LOG_DBG("adc init done");

 	adc_context_unlock_unconditionally(&data->ctx);

 	return 0;
 }

 static const struct adc_driver_api mcux_adc16_driver_api = {
 	.channel_setup = mcux_adc16_channel_setup,
 	.read = mcux_adc16_read,
 #ifdef CONFIG_ADC_ASYNC
 	.read_async = mcux_adc16_read_async,
 #endif
 };

 #ifdef CONFIG_ADC_MCUX_ADC16_ENABLE_EDMA
 #define ADC16_MCUX_EDMA_INIT(n)					\
 	.hw_trigger_src =					\
 		DT_INST_PROP_OR(n, hw_trigger_src, 0),		\
 	.dma_slot = DT_INST_DMAS_CELL_BY_IDX(n, 0, source),	\
 	.trg_offset = DT_INST_CLOCKS_CELL_BY_IDX(n, 0, offset),	\
 	.trg_bits = DT_INST_CLOCKS_CELL_BY_IDX(n, 0, bits),	\
 	.alt_offset = DT_INST_CLOCKS_CELL_BY_IDX(n, 1, offset),	\
 	.alt_bits = DT_INST_CLOCKS_CELL_BY_IDX(n, 1, bits),
 #define ADC16_MCUX_EDMA_DATA(n)					\
 	.dev_dma = DEVICE_DT_GET(DT_INST_DMAS_CTLR_BY_NAME(n, adc##n))
 #define ADC16_MCUX_IRQ_INIT(n)
 #define ADC16_MCUX_IRQ_DECLARE(n)
 #else
 #define ADC16_MCUX_EDMA_INIT(n)
 #define ADC16_MCUX_EDMA_DATA(n)
 #define ADC16_MCUX_IRQ_INIT(n) .irq_config_func = mcux_adc16_config_func_##n,
 #define ADC16_MCUX_IRQ_DECLARE(n)					\
 	static void mcux_adc16_config_func_##n(const struct device *dev) \
 	{								\
 		IRQ_CONNECT(DT_INST_IRQN(n), DT_INST_IRQ(n, priority),	\
 			    mcux_adc16_isr,				\
 			    DEVICE_DT_INST_GET(n), 0);			\
 									\
 		irq_enable(DT_INST_IRQN(n));				\
 	}
 #endif /* CONFIG_ADC_MCUX_ADC16_ENABLE_EDMA */


 #define ACD16_MCUX_INIT(n)					\
 	ADC16_MCUX_IRQ_DECLARE(n)				\
 	PINCTRL_DT_INST_DEFINE(n);				\
 								\
 	static const struct mcux_adc16_config mcux_adc16_config_##n = {	\
 		.base = (ADC_Type *)DT_INST_REG_ADDR(n),		\
 		ADC16_MCUX_IRQ_INIT(n)					\
 		.channel_mux_b = DT_INST_PROP(n, channel_mux_b),	\
 		.clk_source = DT_INST_PROP_OR(n, clk_source, 0),	\
 		.long_sample = DT_INST_PROP_OR(n, long_sample, 0),	\
 		.high_speed = DT_INST_PROP(n, high_speed),		\
 		.periodic_trigger = DT_INST_PROP(n, periodic_trigger),	\
 		.pincfg = PINCTRL_DT_INST_DEV_CONFIG_GET(n),		\
 		.continuous_convert =				\
 			DT_INST_PROP(n, continuous_convert),	\
 		ADC16_MCUX_EDMA_INIT(n)				\
 	};								\
 									\
 	static struct mcux_adc16_data mcux_adc16_data_##n = {		\
 		ADC_CONTEXT_INIT_TIMER(mcux_adc16_data_##n, ctx),	\
 		ADC_CONTEXT_INIT_LOCK(mcux_adc16_data_##n, ctx),	\
 		ADC_CONTEXT_INIT_SYNC(mcux_adc16_data_##n, ctx),	\
 		ADC16_MCUX_EDMA_DATA(n)					\
 	};								\
 									\
 	DEVICE_DT_INST_DEFINE(n, &mcux_adc16_init,	\
 			      NULL,	\
 			      &mcux_adc16_data_##n,	\
 			      &mcux_adc16_config_##n,	\
 			      POST_KERNEL,		\
 			      CONFIG_ADC_INIT_PRIORITY,	\
 			      &mcux_adc16_driver_api);	\

 DT_INST_FOREACH_STATUS_OKAY(ACD16_MCUX_INIT)
	/*
	* Copyright (c) 2017-2018, 2020, NXP
	*
	* SPDX-License-Identifier: Apache-2.0
	*/

	#define DT_DRV_COMPAT nxp_kinetis_adc16

	#include <errno.h>
	#include <zephyr/drivers/adc.h>
	#include <zephyr/drivers/pinctrl.h>
	#ifdef CONFIG_ADC_MCUX_ADC16_ENABLE_EDMA
	#include <zephyr/drivers/dma.h>
	#endif

	#include <fsl_adc16.h>

	#define LOG_LEVEL CONFIG_ADC_LOG_LEVEL
	#include <zephyr/logging/log.h>
	#include <zephyr/irq.h>
	LOG_MODULE_REGISTER(adc_mcux_adc16);

	#define ADC_CONTEXT_USES_KERNEL_TIMER
	#include "adc_context.h"

	struct mcux_adc16_config {
	ADC_Type *base;
	#ifndef CONFIG_ADC_MCUX_ADC16_ENABLE_EDMA
	void (irq_config_func)(const struct device dev);
	#endif
	uint32_t clk_source; /* ADC clock source selection */
	uint32_t long_sample; /* ADC long sample mode selection */
	uint32_t hw_trigger_src; /* ADC hardware trigger source */
	/* defined in SIM module SOPT7 */
	#ifdef CONFIG_ADC_MCUX_ADC16_ENABLE_EDMA
	uint32_t dma_slot; /* ADC DMA MUX slot */
	#endif
	uint32_t trg_offset;
	uint32_t trg_bits;
	uint32_t alt_offset;
	uint32_t alt_bits;
	bool periodic_trigger; /* ADC enable periodic trigger */
	bool channel_mux_b;
	bool high_speed; /* ADC enable high speed mode*/
	bool continuous_convert; /* ADC enable continuous convert*/
	const struct pinctrl_dev_config *pincfg;
	};

	#ifdef CONFIG_ADC_MCUX_ADC16_ENABLE_EDMA
	struct adc_edma_config {
	int32_t state;
	uint32_t dma_channel;
	void (*irq_call_back)(void);
	struct dma_config dma_cfg;
	struct dma_block_config dma_block;
	};
	#endif

	struct mcux_adc16_data {
	const struct device *dev;
	struct adc_context ctx;
	#ifdef CONFIG_ADC_MCUX_ADC16_ENABLE_EDMA
	const struct device *dev_dma;
	struct adc_edma_config adc_dma_config;
	#endif
	uint16_t *buffer;
	uint16_t *repeat_buffer;
	uint32_t channels;
	uint8_t channel_id;
	};

	#ifdef CONFIG_ADC_MCUX_ADC16_HW_TRIGGER
	#define SIM_SOPT7_ADCSET(x, shifts, mask) \
	(((uint32_t)(((uint32_t)(x)) << shifts)) & mask)
	#endif

	#ifdef CONFIG_ADC_MCUX_ADC16_ENABLE_EDMA
	static void adc_dma_callback(const struct device dma_dev, void callback_arg,
	uint32_t channel, int status)
	{
	const struct device dev = (const struct device )callback_arg;
	struct mcux_adc16_data *data = dev->data;

	LOG_DBG("DMA done");
	data->buffer++;
	adc_context_on_sampling_done(&data->ctx, dev);
	}
	#endif

	#ifdef CONFIG_ADC_MCUX_ADC16_HW_TRIGGER
	static void adc_hw_trigger_enable(const struct device *dev)
	{
	const struct mcux_adc16_config *config = dev->config;

	/* enable ADC trigger channel */
	SIM->SOPT7 \|= SIM_SOPT7_ADCSET(config->hw_trigger_src,
	config->trg_offset, config->trg_bits) \|
	SIM_SOPT7_ADCSET(1, config->alt_offset, config->alt_bits);
	}
	#endif

	static int mcux_adc16_channel_setup(const struct device *dev,
	const struct adc_channel_cfg *channel_cfg)
	{
	uint8_t channel_id = channel_cfg->channel_id;

	if (channel_id > (ADC_SC1_ADCH_MASK >> ADC_SC1_ADCH_SHIFT)) {
	LOG_ERR("Channel %d is not valid", channel_id);
	return -EINVAL;
	}

	if (channel_cfg->acquisition_time != ADC_ACQ_TIME_DEFAULT) {
	LOG_ERR("Invalid channel acquisition time");
	return -EINVAL;
	}

	if (channel_cfg->differential) {
	LOG_ERR("Differential channels are not supported");
	return -EINVAL;
	}

	if (channel_cfg->gain != ADC_GAIN_1) {
	LOG_ERR("Invalid channel gain");
	return -EINVAL;
	}

	#ifdef CONFIG_ADC_MCUX_ADC16_HW_TRIGGER
	adc_hw_trigger_enable(dev);
	#endif

	return 0;
	}

	static int start_read(const struct device *dev,
	const struct adc_sequence *sequence)
	{
	const struct mcux_adc16_config *config = dev->config;
	struct mcux_adc16_data *data = dev->data;
	adc16_hardware_average_mode_t mode;
	adc16_resolution_t resolution;
	int error;
	uint32_t tmp32;
	ADC_Type *base = config->base;

	switch (sequence->resolution) {
	case 8:
	case 9:
	resolution = kADC16_Resolution8or9Bit;
	break;
	case 10:
	case 11:
	resolution = kADC16_Resolution10or11Bit;
	break;
	case 12:
	case 13:
	resolution = kADC16_Resolution12or13Bit;
	break;
	#if defined(FSL_FEATURE_ADC16_MAX_RESOLUTION) && \
	(FSL_FEATURE_ADC16_MAX_RESOLUTION >= 16U)
	case 16:
	resolution = kADC16_Resolution16Bit;
	break;
	#endif
	default:
	LOG_ERR("Invalid resolution");
	return -EINVAL;
	}

	tmp32 = base->CFG1 & ~(ADC_CFG1_MODE_MASK);
	tmp32 \|= ADC_CFG1_MODE(resolution);
	base->CFG1 = tmp32;

	switch (sequence->oversampling) {
	case 0:
	mode = kADC16_HardwareAverageDisabled;
	break;
	case 2:
	mode = kADC16_HardwareAverageCount4;
	break;
	case 3:
	mode = kADC16_HardwareAverageCount8;
	break;
	case 4:
	mode = kADC16_HardwareAverageCount16;
	break;
	case 5:
	mode = kADC16_HardwareAverageCount32;
	break;
	default:
	LOG_ERR("Invalid oversampling");
	return -EINVAL;
	}
	ADC16_SetHardwareAverage(config->base, mode);

	if (sequence->buffer_size < 2) {
	LOG_ERR("sequence buffer size too small %d < 2", sequence->buffer_size);
	return -EINVAL;
	}

	if (sequence->options) {
	if (sequence->buffer_size <
	2 * (sequence->options->extra_samplings + 1)) {
	LOG_ERR("sequence buffer size too small < 2 * extra + 2");
	return -EINVAL;
	}
	}

	data->buffer = sequence->buffer;

	adc_context_start_read(&data->ctx, sequence);

	error = adc_context_wait_for_completion(&data->ctx);
	#ifdef CONFIG_ADC_MCUX_ADC16_ENABLE_EDMA
	dma_stop(data->dev_dma, data->adc_dma_config.dma_channel);
	#endif
	return error;
	}

	static int mcux_adc16_read(const struct device *dev,
	const struct adc_sequence *sequence)
	{
	struct mcux_adc16_data *data = dev->data;
	int error;

	adc_context_lock(&data->ctx, false, NULL);
	error = start_read(dev, sequence);
	adc_context_release(&data->ctx, error);

	return error;
	}

	#ifdef CONFIG_ADC_ASYNC
	static int mcux_adc16_read_async(const struct device *dev,
	const struct adc_sequence *sequence,
	struct k_poll_signal *async)
	{
	struct mcux_adc16_data *data = dev->data;
	int error;

	adc_context_lock(&data->ctx, true, async);
	error = start_read(dev, sequence);
	adc_context_release(&data->ctx, error);

	return error;
	}
	#endif

	static void mcux_adc16_start_channel(const struct device *dev)
	{
	const struct mcux_adc16_config *config = dev->config;
	struct mcux_adc16_data *data = dev->data;

	adc16_channel_config_t channel_config;
	uint32_t channel_group = 0U;

	data->channel_id = find_lsb_set(data->channels) - 1;

	LOG_DBG("Starting channel %d", data->channel_id);

	#if defined(FSL_FEATURE_ADC16_HAS_DIFF_MODE) && FSL_FEATURE_ADC16_HAS_DIFF_MODE
	channel_config.enableDifferentialConversion = false;
	#endif
	channel_config.enableInterruptOnConversionCompleted = true;
	channel_config.channelNumber = data->channel_id;
	ADC16_SetChannelConfig(config->base, channel_group, &channel_config);
	#ifdef CONFIG_ADC_MCUX_ADC16_ENABLE_EDMA
	LOG_DBG("Starting EDMA");
	dma_start(data->dev_dma, data->adc_dma_config.dma_channel);
	#endif
	LOG_DBG("Starting channel done");
	}

	static void adc_context_start_sampling(struct adc_context *ctx)
	{
	struct mcux_adc16_data *data =
	CONTAINER_OF(ctx, struct mcux_adc16_data, ctx);

	data->channels = ctx->sequence.channels;
	data->repeat_buffer = data->buffer;

	#ifdef CONFIG_ADC_MCUX_ADC16_ENABLE_EDMA
	LOG_DBG("config dma");
	data->adc_dma_config.dma_block.block_size = 2;
	data->adc_dma_config.dma_block.dest_address = (uint32_t)data->buffer;
	data->adc_dma_config.dma_cfg.head_block =
	&(data->adc_dma_config.dma_block);
	dma_config(data->dev_dma, data->adc_dma_config.dma_channel,
	&data->adc_dma_config.dma_cfg);
	#endif

	mcux_adc16_start_channel(data->dev);
	}

	static void adc_context_update_buffer_pointer(struct adc_context *ctx,
	bool repeat_sampling)
	{
	struct mcux_adc16_data *data =
	CONTAINER_OF(ctx, struct mcux_adc16_data, ctx);

	if (repeat_sampling) {
	data->buffer = data->repeat_buffer;
	}
	}

	#ifndef CONFIG_ADC_MCUX_ADC16_ENABLE_EDMA
	static void mcux_adc16_isr(const struct device *dev)
	{
	const struct mcux_adc16_config *config = dev->config;
	struct mcux_adc16_data *data = dev->data;
	ADC_Type *base = config->base;
	uint32_t channel_group = 0U;
	uint16_t result;

	result = ADC16_GetChannelConversionValue(base, channel_group);
	LOG_DBG("Finished channel %d. Result is 0x%04x", data->channel_id,
	result);

	*data->buffer++ = result;
	data->channels &= ~BIT(data->channel_id);

	if (data->channels) {
	mcux_adc16_start_channel(dev);
	} else {
	adc_context_on_sampling_done(&data->ctx, dev);
	}
	}
	#endif

	static int mcux_adc16_init(const struct device *dev)
	{
	const struct mcux_adc16_config *config = dev->config;
	struct mcux_adc16_data *data = dev->data;
	ADC_Type *base = config->base;
	adc16_config_t adc_config;
	int err;

	LOG_DBG("init adc");
	ADC16_GetDefaultConfig(&adc_config);

	#ifdef CONFIG_ADC_MCUX_ADC16_ENABLE_EDMA
	adc_config.clockSource = (adc16_clock_source_t)config->clk_source;
	adc_config.longSampleMode =
	(adc16_long_sample_mode_t)config->long_sample;
	adc_config.enableHighSpeed = config->high_speed;
	adc_config.enableContinuousConversion = config->continuous_convert;
	#endif

	#if CONFIG_ADC_MCUX_ADC16_VREF_DEFAULT
	adc_config.referenceVoltageSource = kADC16_ReferenceVoltageSourceVref;
	#else /* CONFIG_ADC_MCUX_ADC16_VREF_ALTERNATE */
	adc_config.referenceVoltageSource = kADC16_ReferenceVoltageSourceValt;
	#endif

	#if CONFIG_ADC_MCUX_ADC16_CLK_DIV_RATIO_1
	adc_config.clockDivider = kADC16_ClockDivider1;
	#elif CONFIG_ADC_MCUX_ADC16_CLK_DIV_RATIO_2
	adc_config.clockDivider = kADC16_ClockDivider2;
	#elif CONFIG_ADC_MCUX_ADC16_CLK_DIV_RATIO_4
	adc_config.clockDivider = kADC16_ClockDivider4;
	#else /* CONFIG_ADC_MCUX_ADC16_CLK_DIV_RATIO_8 */
	adc_config.clockDivider = kADC16_ClockDivider8;
	#endif

	ADC16_Init(base, &adc_config);
	#if defined(FSL_FEATURE_ADC16_HAS_CALIBRATION) && \
	FSL_FEATURE_ADC16_HAS_CALIBRATION
	ADC16_SetHardwareAverage(base, kADC16_HardwareAverageCount32);
	ADC16_DoAutoCalibration(base);
	#endif
	if (config->channel_mux_b) {
	ADC16_SetChannelMuxMode(base, kADC16_ChannelMuxB);
	}

	if (IS_ENABLED(CONFIG_ADC_MCUX_ADC16_HW_TRIGGER)) {
	ADC16_EnableHardwareTrigger(base, true);
	} else {
	ADC16_EnableHardwareTrigger(base, false);
	}

	err = pinctrl_apply_state(config->pincfg, PINCTRL_STATE_DEFAULT);
	if (err != 0) {
	return err;
	}

	data->dev = dev;

	/* dma related init */
	#ifdef CONFIG_ADC_MCUX_ADC16_ENABLE_EDMA
	/* Enable DMA. */
	ADC16_EnableDMA(base, true);
	data->adc_dma_config.dma_cfg.block_count = 1U;
	data->adc_dma_config.dma_cfg.dma_slot = config->dma_slot;
	data->adc_dma_config.dma_cfg.channel_direction = PERIPHERAL_TO_MEMORY;
	data->adc_dma_config.dma_cfg.source_burst_length = 2U;
	data->adc_dma_config.dma_cfg.dest_burst_length = 2U;
	data->adc_dma_config.dma_cfg.channel_priority = 0U;
	data->adc_dma_config.dma_cfg.dma_callback = adc_dma_callback;
	data->adc_dma_config.dma_cfg.user_data = (void *)dev;

	data->adc_dma_config.dma_cfg.source_data_size = 2U;
	data->adc_dma_config.dma_cfg.dest_data_size = 2U;
	data->adc_dma_config.dma_block.source_address = (uint32_t)&base->R[0];

	if (data->dev_dma == NULL \|\| !device_is_ready(data->dev_dma)) {
	LOG_ERR("dma binding fail");
	return -EINVAL;
	}

	if (config->periodic_trigger) {
	enum dma_channel_filter adc_filter = DMA_CHANNEL_PERIODIC;

	data->adc_dma_config.dma_channel =
	dma_request_channel(data->dev_dma, (void *)&adc_filter);
	} else {
	enum dma_channel_filter adc_filter = DMA_CHANNEL_NORMAL;

	data->adc_dma_config.dma_channel =
	dma_request_channel(data->dev_dma, (void *)&adc_filter);
	}
	if (data->adc_dma_config.dma_channel == -EINVAL) {
	LOG_ERR("can not allocate dma channel");
	return -EINVAL;
	}
	LOG_DBG("dma allocated channel %d", data->adc_dma_config.dma_channel);
	#else
	config->irq_config_func(dev);
	#endif
	LOG_DBG("adc init done");

	adc_context_unlock_unconditionally(&data->ctx);

	return 0;
	}

	static const struct adc_driver_api mcux_adc16_driver_api = {
	.channel_setup = mcux_adc16_channel_setup,
	.read = mcux_adc16_read,
	#ifdef CONFIG_ADC_ASYNC
	.read_async = mcux_adc16_read_async,
	#endif
	};

	#ifdef CONFIG_ADC_MCUX_ADC16_ENABLE_EDMA
	#define ADC16_MCUX_EDMA_INIT(n) \
	.hw_trigger_src = \
	DT_INST_PROP_OR(n, hw_trigger_src, 0), \
	.dma_slot = DT_INST_DMAS_CELL_BY_IDX(n, 0, source), \
	.trg_offset = DT_INST_CLOCKS_CELL_BY_IDX(n, 0, offset), \
	.trg_bits = DT_INST_CLOCKS_CELL_BY_IDX(n, 0, bits), \
	.alt_offset = DT_INST_CLOCKS_CELL_BY_IDX(n, 1, offset), \
	.alt_bits = DT_INST_CLOCKS_CELL_BY_IDX(n, 1, bits),
	#define ADC16_MCUX_EDMA_DATA(n) \
	.dev_dma = DEVICE_DT_GET(DT_INST_DMAS_CTLR_BY_NAME(n, adc##n))
	#define ADC16_MCUX_IRQ_INIT(n)
	#define ADC16_MCUX_IRQ_DECLARE(n)
	#else
	#define ADC16_MCUX_EDMA_INIT(n)
	#define ADC16_MCUX_EDMA_DATA(n)
	#define ADC16_MCUX_IRQ_INIT(n) .irq_config_func = mcux_adc16_config_func_##n,
	#define ADC16_MCUX_IRQ_DECLARE(n) \
	static void mcux_adc16_config_func_##n(const struct device *dev) \
	{ \
	IRQ_CONNECT(DT_INST_IRQN(n), DT_INST_IRQ(n, priority), \
	mcux_adc16_isr, \
	DEVICE_DT_INST_GET(n), 0); \
	\
	irq_enable(DT_INST_IRQN(n)); \
	}
	#endif /* CONFIG_ADC_MCUX_ADC16_ENABLE_EDMA */


	#define ACD16_MCUX_INIT(n) \
	ADC16_MCUX_IRQ_DECLARE(n) \
	PINCTRL_DT_INST_DEFINE(n); \
	\
	static const struct mcux_adc16_config mcux_adc16_config_##n = { \
	.base = (ADC_Type *)DT_INST_REG_ADDR(n), \
	ADC16_MCUX_IRQ_INIT(n) \
	.channel_mux_b = DT_INST_PROP(n, channel_mux_b), \
	.clk_source = DT_INST_PROP_OR(n, clk_source, 0), \
	.long_sample = DT_INST_PROP_OR(n, long_sample, 0), \
	.high_speed = DT_INST_PROP(n, high_speed), \
	.periodic_trigger = DT_INST_PROP(n, periodic_trigger), \
	.pincfg = PINCTRL_DT_INST_DEV_CONFIG_GET(n), \
	.continuous_convert = \
	DT_INST_PROP(n, continuous_convert), \
	ADC16_MCUX_EDMA_INIT(n) \
	}; \
	\
	static struct mcux_adc16_data mcux_adc16_data_##n = { \
	ADC_CONTEXT_INIT_TIMER(mcux_adc16_data_##n, ctx), \
	ADC_CONTEXT_INIT_LOCK(mcux_adc16_data_##n, ctx), \
	ADC_CONTEXT_INIT_SYNC(mcux_adc16_data_##n, ctx), \
	ADC16_MCUX_EDMA_DATA(n) \
	}; \
	\
	DEVICE_DT_INST_DEFINE(n, &mcux_adc16_init, \
	NULL, \
	&mcux_adc16_data_##n, \
	&mcux_adc16_config_##n, \
	POST_KERNEL, \
	CONFIG_ADC_INIT_PRIORITY, \
	&mcux_adc16_driver_api); \

	DT_INST_FOREACH_STATUS_OKAY(ACD16_MCUX_INIT)