drivers/sensor/lm77/lm77.c - third_party/github/zephyrproject-rtos/zephyr - Git at Google

 /*
  * Copyright (c) 2021 Vestas Wind Systems A/S
  *
  * SPDX-License-Identifier: Apache-2.0
  */

 #define DT_DRV_COMPAT lm77

 #include <device.h>
 #include <drivers/gpio.h>
 #include <drivers/i2c.h>
 #include <drivers/sensor.h>
 #include <logging/log.h>
 #include <sys/byteorder.h>

 LOG_MODULE_REGISTER(lm77, CONFIG_SENSOR_LOG_LEVEL);

 /*
  * Only compile in trigger support if enabled in Kconfig and at least one
  * enabled lm77 devicetree node has the int-gpios property.
  */
 #define LM77_TRIGGER_SUPPORT_INST(inst) DT_INST_NODE_HAS_PROP(inst, int_gpios) ||
 #define LM77_TRIGGER_SUPPORT \
 	(CONFIG_LM77_TRIGGER && (DT_INST_FOREACH_STATUS_OKAY(LM77_TRIGGER_SUPPORT_INST) 0))

 /* LM77 registers */
 #define LM77_REG_TEMP   0x00U
 #define LM77_REG_CONFIG 0x01U
 #define LM77_REG_THYST  0x02U
 #define LM77_REG_TCRIT  0x03U
 #define LM77_REG_TLOW   0x04U
 #define LM77_REG_THIGH  0x05U

 /* LM77 configuration register bits */
 union lm77_reg_config {
 	uint8_t reg;
 	struct {
 		uint8_t shutdown : 1;
 		uint8_t int_mode : 1;
 		uint8_t tcrita_pol : 1;
 		uint8_t int_pol : 1;
 		uint8_t fault_queue : 1;
 		uint8_t reserved : 3;
 	} __packed;
 };

 struct lm77_config {
 	struct i2c_dt_spec i2c;
 	union lm77_reg_config config_dt;
 #if LM77_TRIGGER_SUPPORT
 	struct gpio_dt_spec int_gpio;
 #endif /* LM77_TRIGGER_SUPPORT */
 };

 struct lm77_data {
 	int16_t temp;
 #if LM77_TRIGGER_SUPPORT
 	const struct device *dev;
 	struct k_work_q workq;
 	struct k_work work;
 	struct gpio_callback int_gpio_cb;
 	const struct sensor_trigger *trigger;
 	sensor_trigger_handler_t trigger_handler;

 	K_KERNEL_STACK_MEMBER(stack, CONFIG_LM77_TRIGGER_THREAD_STACK_SIZE);
 #endif /* LM77_TRIGGER_SUPPORT */
 };

 static int lm77_write_config(const struct device *dev, uint8_t value)
 {
 	const struct lm77_config *config = dev->config;
 	uint8_t buf[2] = { LM77_REG_CONFIG, value };

 	return i2c_write_dt(&config->i2c, buf, sizeof(buf));
 }

 static int lm77_read_temp(const struct device *dev, uint8_t reg, int16_t *value)
 {
 	const struct lm77_config *config = dev->config;
 	uint8_t buf[2];
 	int err;

 	err = i2c_write_read_dt(&config->i2c, &reg, sizeof(reg), &buf, sizeof(buf));
 	if (err < 0) {
 		LOG_ERR("failed to read temperature register 0x%02x (err %d)", reg, err);
 		return err;
 	}

 	*value = sys_get_be16(buf);

 	return 0;
 }

 static int lm77_write_temp(const struct device *dev, uint8_t reg, int16_t value)
 {
 	const struct lm77_config *config = dev->config;
 	uint8_t buf[3] = { reg, value >> 8, value };

 	return i2c_write_dt(&config->i2c, buf, sizeof(buf));
 }

 static void lm77_sensor_value_to_temp(const struct sensor_value *val, int16_t *temp)
 {
 	/* Integer part in degrees Celsius (LSB = 0.5 degrees Celsius) */
 	*temp = val->val1 << 1;

 	/* Fractional part in micro degrees Celsius */
 	*temp += (val->val2 * 2) / 1000000;

 	/* Shift up to include "status" bits */
 	*temp <<= 3;
 }

 static void lm77_temp_to_sensor_value(int16_t temp, struct sensor_value *val)
 {
 	/* Shift down to remove "status" bits (LSB = 0.5 degrees Celsius) */
 	temp = (temp >> 3) * 5;

 	/* Integer part in degrees Celsius */
 	val->val1 = temp / 10;

 	/* Fractional part in micro degrees Celsius */
 	val->val2 = temp % 10;
 	val->val2 *= 100000;
 }

 static int lm77_attr_set(const struct device *dev, enum sensor_channel chan,
 			 enum sensor_attribute attr, const struct sensor_value *val)
 {
 	int16_t temp = 0;
 	uint8_t reg;
 	int err;

 	__ASSERT_NO_MSG(val != NULL);

 	if (chan != SENSOR_CHAN_AMBIENT_TEMP) {
 		return -ENOTSUP;
 	}

 	switch (attr) {
 	case SENSOR_ATTR_LOWER_THRESH:
 		reg = LM77_REG_TLOW;
 		break;
 	case SENSOR_ATTR_UPPER_THRESH:
 		reg = LM77_REG_THIGH;
 		break;
 	case SENSOR_ATTR_ALERT:
 		reg = LM77_REG_TCRIT;
 		break;
 	case SENSOR_ATTR_HYSTERESIS:
 		reg = LM77_REG_THYST;
 		break;
 	default:
 		return -ENOTSUP;
 	}

 	lm77_sensor_value_to_temp(val, &temp);

 	err = lm77_write_temp(dev, reg, temp);
 	if (err < 0) {
 		LOG_ERR("failed to write register 0x%02x (err %d)", reg, err);
 		return err;
 	}

 	return 0;
 }

 static int lm77_attr_get(const struct device *dev, enum sensor_channel chan,
 			 enum sensor_attribute attr, struct sensor_value *val)
 {
 	int16_t temp;
 	uint8_t reg;
 	int err;

 	__ASSERT_NO_MSG(val != NULL);

 	if (chan != SENSOR_CHAN_AMBIENT_TEMP) {
 		return -ENOTSUP;
 	}

 	switch (attr) {
 	case SENSOR_ATTR_LOWER_THRESH:
 		reg = LM77_REG_TLOW;
 		break;
 	case SENSOR_ATTR_UPPER_THRESH:
 		reg = LM77_REG_THIGH;
 		break;
 	case SENSOR_ATTR_ALERT:
 		reg = LM77_REG_TCRIT;
 		break;
 	case SENSOR_ATTR_HYSTERESIS:
 		reg = LM77_REG_THYST;
 		break;
 	default:
 		return -ENOTSUP;
 	}

 	err = lm77_read_temp(dev, reg, &temp);
 	if (err < 0) {
 		LOG_ERR("failed to read register 0x%02x (err %d)", reg, err);
 		return err;
 	}

 	lm77_temp_to_sensor_value(temp, val);

 	return 0;
 }

 #if LM77_TRIGGER_SUPPORT
 static int lm77_trigger_set(const struct device *dev, const struct sensor_trigger *trig,
 			    sensor_trigger_handler_t handler)
 {
 	const struct lm77_config *config = dev->config;
 	struct lm77_data *data = dev->data;
 	gpio_flags_t flags;
 	int err;

 	__ASSERT_NO_MSG(trig != NULL);

 	if (trig->type != SENSOR_TRIG_THRESHOLD || trig->chan != SENSOR_CHAN_AMBIENT_TEMP ||
 	    config->int_gpio.port == NULL) {
 		return -ENOTSUP;
 	}

 	if (handler != NULL) {
 		flags = GPIO_INT_EDGE_TO_ACTIVE;
 	} else {
 		flags = GPIO_INT_DISABLE;
 	}

 	err = gpio_pin_interrupt_configure_dt(&config->int_gpio, flags);
 	if (err < 0) {
 		LOG_ERR("failed to configure INT GPIO IRQ (err %d)", err);
 		return err;
 	}

 	data->trigger = trig;
 	data->trigger_handler = handler;

 	return 0;
 }

 static void lm77_trigger_work_handler(struct k_work *item)
 {
 	struct lm77_data *data = CONTAINER_OF(item, struct lm77_data, work);
 	sensor_trigger_handler_t handler = data->trigger_handler;

 	if (handler != NULL) {
 		handler(data->dev, (struct sensor_trigger *)data->trigger);
 	}
 }

 static void lm77_int_gpio_callback_handler(const struct device *port,
 					   struct gpio_callback *cb,
 					   gpio_port_pins_t pins)
 {
 	struct lm77_data *data = CONTAINER_OF(cb, struct lm77_data, int_gpio_cb);

 	ARG_UNUSED(port);
 	ARG_UNUSED(pins);

 	k_work_submit_to_queue(&data->workq, &data->work);
 }
 #endif /* LM77_TRIGGER_SUPPORT */

 static int lm77_sample_fetch(const struct device *dev, enum sensor_channel chan)
 {
 	struct lm77_data *data = dev->data;
 	int16_t temp;
 	int err;

 	if (chan != SENSOR_CHAN_ALL && chan != SENSOR_CHAN_AMBIENT_TEMP) {
 		return -ENOTSUP;
 	}

 	err = lm77_read_temp(dev, LM77_REG_TEMP, &temp);
 	if (err < 0) {
 		LOG_ERR("failed to read temperature (err %d)", err);
 		return err;
 	}

 	data->temp = temp;

 	return 0;
 }

 static int lm77_channel_get(const struct device *dev, enum sensor_channel chan,
 			    struct sensor_value *val)
 {
 	struct lm77_data *data = dev->data;

 	if (chan != SENSOR_CHAN_AMBIENT_TEMP) {
 		return -ENOTSUP;
 	}

 	lm77_temp_to_sensor_value(data->temp, val);

 	return 0;
 }

 static const struct sensor_driver_api lm77_driver_api = {
 	.attr_set = lm77_attr_set,
 	.attr_get = lm77_attr_get,
 #if LM77_TRIGGER_SUPPORT
 	.trigger_set = lm77_trigger_set,
 #endif /* LM77_TRIGGER_SUPPORT */
 	.sample_fetch = lm77_sample_fetch,
 	.channel_get = lm77_channel_get,
 };

 static int lm77_init(const struct device *dev)
 {
 	const struct lm77_config *config = dev->config;
 	int err;
 #if LM77_TRIGGER_SUPPORT
 	struct lm77_data *data = dev->data;
 #endif /* LM77_TRIGGER_SUPPORT */

 	if (!device_is_ready(config->i2c.bus)) {
 		LOG_ERR("I2c bus not ready");
 		return -EINVAL;
 	}

 	err = lm77_write_config(dev, config->config_dt.reg);
 	if (err < 0) {
 		LOG_ERR("failed to write configuration (err %d)", err);
 		return err;
 	}

 #if LM77_TRIGGER_SUPPORT
 	data->dev = dev;
 	k_work_queue_start(&data->workq, data->stack, K_THREAD_STACK_SIZEOF(data->stack),
 			   CONFIG_LM77_TRIGGER_THREAD_PRIO, NULL);
 	k_thread_name_set(&data->workq.thread, "lm77_trigger");
 	k_work_init(&data->work, lm77_trigger_work_handler);

 	if (config->int_gpio.port != NULL) {
 		if (!device_is_ready(config->int_gpio.port)) {
 			LOG_ERR("INT GPIO not ready");
 			return -EINVAL;
 		}

 		err = gpio_pin_configure_dt(&config->int_gpio, GPIO_INPUT);
 		if (err < 0) {
 			LOG_ERR("failed to configure INT GPIO (err %d)", err);
 			return err;
 		}

 		gpio_init_callback(&data->int_gpio_cb, lm77_int_gpio_callback_handler,
 				   BIT(config->int_gpio.pin));

 		err = gpio_add_callback(config->int_gpio.port, &data->int_gpio_cb);
 		if (err < 0) {
 			LOG_ERR("failed to add INT GPIO callback (err %d)", err);
 			return err;
 		}
 	}
 #endif /* LM77_TRIGGER_SUPPORT */

 	return 0;
 }

 #ifdef CONFIG_PM_DEVICE
 static int lm77_pm_control(const struct device *dev, enum pm_device_action action)
 {
 	const struct lm77_config *config = dev->config;
 	union lm77_reg_config creg = config->config_dt;
 	int err;

 	switch (action) {
 	case PM_DEVICE_ACTION_SUSPEND:
 		creg.shutdown = 1;
 		break;
 	case PM_DEVICE_ACTION_RESUME:
 		creg.shutdown = 0;
 		break;
 	default:
 		return -ENOTSUP;
 	}

 	err = lm77_write_config(dev, creg.reg);
 	if (err < 0) {
 		LOG_ERR("failed to write configuration (err %d)", err);
 		return err;
 	}

 	return 0;
 }
 #endif /* CONFIG_PM_DEVICE */

 #if LM77_TRIGGER_SUPPORT
 #define LM77_INT_GPIO_INIT(n) .int_gpio = GPIO_DT_SPEC_INST_GET_OR(n, int_gpios, { 0 })
 #else /* LM77_TRIGGER_SUPPORT */
 #define LM77_INT_GPIO_INIT(n)
 #endif /* ! LM77_TRIGGER_SUPPORT */

 #ifdef CONFIG_PM_DEVICE
 #define LM77_PM_CONTROL_FUNC lm77_pm_control
 #else /* CONFIG_PM_DEVICE */
 #define LM77_PM_CONTROL_FUNC NULL
 #endif /* ! CONFIG_PM_DEVICE */

 #define LM77_INIT(n)							\
 	static struct lm77_data lm77_data_##n;				\
 									\
 	static const struct lm77_config lm77_config_##n = {		\
 		.i2c = I2C_DT_SPEC_INST_GET(n),				\
 		.config_dt = {						\
 			.shutdown = 0,					\
 			.int_mode = DT_INST_NODE_HAS_PROP(n, int_gpios), \
 			.tcrita_pol = DT_INST_PROP(n, tcrita_inverted), \
 			.int_pol = DT_INST_PROP(n, int_inverted),	\
 			.fault_queue = DT_INST_PROP(n, enable_fault_queue), \
 			.reserved = 0,					\
 		},							\
 		LM77_INT_GPIO_INIT(n)					\
 	};								\
 									\
 	DEVICE_DT_INST_DEFINE(n, lm77_init,				\
 			      LM77_PM_CONTROL_FUNC,			\
 			      &lm77_data_##n,				\
 			      &lm77_config_##n, POST_KERNEL,		\
 			      CONFIG_SENSOR_INIT_PRIORITY,		\
 			      &lm77_driver_api);

 DT_INST_FOREACH_STATUS_OKAY(LM77_INIT)
	/*
	* Copyright (c) 2021 Vestas Wind Systems A/S
	*
	* SPDX-License-Identifier: Apache-2.0
	*/

	#define DT_DRV_COMPAT lm77

	#include <device.h>
	#include <drivers/gpio.h>
	#include <drivers/i2c.h>
	#include <drivers/sensor.h>
	#include <logging/log.h>
	#include <sys/byteorder.h>

	LOG_MODULE_REGISTER(lm77, CONFIG_SENSOR_LOG_LEVEL);

	/*
	* Only compile in trigger support if enabled in Kconfig and at least one
	* enabled lm77 devicetree node has the int-gpios property.
	*/
	#define LM77_TRIGGER_SUPPORT_INST(inst) DT_INST_NODE_HAS_PROP(inst, int_gpios) \|\|
	#define LM77_TRIGGER_SUPPORT \
	(CONFIG_LM77_TRIGGER && (DT_INST_FOREACH_STATUS_OKAY(LM77_TRIGGER_SUPPORT_INST) 0))

	/* LM77 registers */
	#define LM77_REG_TEMP 0x00U
	#define LM77_REG_CONFIG 0x01U
	#define LM77_REG_THYST 0x02U
	#define LM77_REG_TCRIT 0x03U
	#define LM77_REG_TLOW 0x04U
	#define LM77_REG_THIGH 0x05U

	/* LM77 configuration register bits */
	union lm77_reg_config {
	uint8_t reg;
	struct {
	uint8_t shutdown : 1;
	uint8_t int_mode : 1;
	uint8_t tcrita_pol : 1;
	uint8_t int_pol : 1;
	uint8_t fault_queue : 1;
	uint8_t reserved : 3;
	} __packed;
	};

	struct lm77_config {
	struct i2c_dt_spec i2c;
	union lm77_reg_config config_dt;
	#if LM77_TRIGGER_SUPPORT
	struct gpio_dt_spec int_gpio;
	#endif /* LM77_TRIGGER_SUPPORT */
	};

	struct lm77_data {
	int16_t temp;
	#if LM77_TRIGGER_SUPPORT
	const struct device *dev;
	struct k_work_q workq;
	struct k_work work;
	struct gpio_callback int_gpio_cb;
	const struct sensor_trigger *trigger;
	sensor_trigger_handler_t trigger_handler;

	K_KERNEL_STACK_MEMBER(stack, CONFIG_LM77_TRIGGER_THREAD_STACK_SIZE);
	#endif /* LM77_TRIGGER_SUPPORT */
	};

	static int lm77_write_config(const struct device *dev, uint8_t value)
	{
	const struct lm77_config *config = dev->config;
	uint8_t buf[2] = { LM77_REG_CONFIG, value };

	return i2c_write_dt(&config->i2c, buf, sizeof(buf));
	}

	static int lm77_read_temp(const struct device dev, uint8_t reg, int16_t value)
	{
	const struct lm77_config *config = dev->config;
	uint8_t buf[2];
	int err;

	err = i2c_write_read_dt(&config->i2c, &reg, sizeof(reg), &buf, sizeof(buf));
	if (err < 0) {
	LOG_ERR("failed to read temperature register 0x%02x (err %d)", reg, err);
	return err;
	}

	*value = sys_get_be16(buf);

	return 0;
	}

	static int lm77_write_temp(const struct device *dev, uint8_t reg, int16_t value)
	{
	const struct lm77_config *config = dev->config;
	uint8_t buf[3] = { reg, value >> 8, value };

	return i2c_write_dt(&config->i2c, buf, sizeof(buf));
	}

	static void lm77_sensor_value_to_temp(const struct sensor_value val, int16_t temp)
	{
	/* Integer part in degrees Celsius (LSB = 0.5 degrees Celsius) */
	*temp = val->val1 << 1;

	/* Fractional part in micro degrees Celsius */
	temp += (val->val2 2) / 1000000;

	/* Shift up to include "status" bits */
	*temp <<= 3;
	}

	static void lm77_temp_to_sensor_value(int16_t temp, struct sensor_value *val)
	{
	/* Shift down to remove "status" bits (LSB = 0.5 degrees Celsius) */
	temp = (temp >> 3) * 5;

	/* Integer part in degrees Celsius */
	val->val1 = temp / 10;

	/* Fractional part in micro degrees Celsius */
	val->val2 = temp % 10;
	val->val2 *= 100000;
	}

	static int lm77_attr_set(const struct device *dev, enum sensor_channel chan,
	enum sensor_attribute attr, const struct sensor_value *val)
	{
	int16_t temp = 0;
	uint8_t reg;
	int err;

	__ASSERT_NO_MSG(val != NULL);

	if (chan != SENSOR_CHAN_AMBIENT_TEMP) {
	return -ENOTSUP;
	}

	switch (attr) {
	case SENSOR_ATTR_LOWER_THRESH:
	reg = LM77_REG_TLOW;
	break;
	case SENSOR_ATTR_UPPER_THRESH:
	reg = LM77_REG_THIGH;
	break;
	case SENSOR_ATTR_ALERT:
	reg = LM77_REG_TCRIT;
	break;
	case SENSOR_ATTR_HYSTERESIS:
	reg = LM77_REG_THYST;
	break;
	default:
	return -ENOTSUP;
	}

	lm77_sensor_value_to_temp(val, &temp);

	err = lm77_write_temp(dev, reg, temp);
	if (err < 0) {
	LOG_ERR("failed to write register 0x%02x (err %d)", reg, err);
	return err;
	}

	return 0;
	}

	static int lm77_attr_get(const struct device *dev, enum sensor_channel chan,
	enum sensor_attribute attr, struct sensor_value *val)
	{
	int16_t temp;
	uint8_t reg;
	int err;

	__ASSERT_NO_MSG(val != NULL);

	if (chan != SENSOR_CHAN_AMBIENT_TEMP) {
	return -ENOTSUP;
	}

	switch (attr) {
	case SENSOR_ATTR_LOWER_THRESH:
	reg = LM77_REG_TLOW;
	break;
	case SENSOR_ATTR_UPPER_THRESH:
	reg = LM77_REG_THIGH;
	break;
	case SENSOR_ATTR_ALERT:
	reg = LM77_REG_TCRIT;
	break;
	case SENSOR_ATTR_HYSTERESIS:
	reg = LM77_REG_THYST;
	break;
	default:
	return -ENOTSUP;
	}

	err = lm77_read_temp(dev, reg, &temp);
	if (err < 0) {
	LOG_ERR("failed to read register 0x%02x (err %d)", reg, err);
	return err;
	}

	lm77_temp_to_sensor_value(temp, val);

	return 0;
	}

	#if LM77_TRIGGER_SUPPORT
	static int lm77_trigger_set(const struct device dev, const struct sensor_trigger trig,
	sensor_trigger_handler_t handler)
	{
	const struct lm77_config *config = dev->config;
	struct lm77_data *data = dev->data;
	gpio_flags_t flags;
	int err;

	__ASSERT_NO_MSG(trig != NULL);

	if (trig->type != SENSOR_TRIG_THRESHOLD \|\| trig->chan != SENSOR_CHAN_AMBIENT_TEMP \|\|
	config->int_gpio.port == NULL) {
	return -ENOTSUP;
	}

	if (handler != NULL) {
	flags = GPIO_INT_EDGE_TO_ACTIVE;
	} else {
	flags = GPIO_INT_DISABLE;
	}

	err = gpio_pin_interrupt_configure_dt(&config->int_gpio, flags);
	if (err < 0) {
	LOG_ERR("failed to configure INT GPIO IRQ (err %d)", err);
	return err;
	}

	data->trigger = trig;
	data->trigger_handler = handler;

	return 0;
	}

	static void lm77_trigger_work_handler(struct k_work *item)
	{
	struct lm77_data *data = CONTAINER_OF(item, struct lm77_data, work);
	sensor_trigger_handler_t handler = data->trigger_handler;

	if (handler != NULL) {
	handler(data->dev, (struct sensor_trigger *)data->trigger);
	}
	}

	static void lm77_int_gpio_callback_handler(const struct device *port,
	struct gpio_callback *cb,
	gpio_port_pins_t pins)
	{
	struct lm77_data *data = CONTAINER_OF(cb, struct lm77_data, int_gpio_cb);

	ARG_UNUSED(port);
	ARG_UNUSED(pins);

	k_work_submit_to_queue(&data->workq, &data->work);
	}
	#endif /* LM77_TRIGGER_SUPPORT */

	static int lm77_sample_fetch(const struct device *dev, enum sensor_channel chan)
	{
	struct lm77_data *data = dev->data;
	int16_t temp;
	int err;

	if (chan != SENSOR_CHAN_ALL && chan != SENSOR_CHAN_AMBIENT_TEMP) {
	return -ENOTSUP;
	}

	err = lm77_read_temp(dev, LM77_REG_TEMP, &temp);
	if (err < 0) {
	LOG_ERR("failed to read temperature (err %d)", err);
	return err;
	}

	data->temp = temp;

	return 0;
	}

	static int lm77_channel_get(const struct device *dev, enum sensor_channel chan,
	struct sensor_value *val)
	{
	struct lm77_data *data = dev->data;

	if (chan != SENSOR_CHAN_AMBIENT_TEMP) {
	return -ENOTSUP;
	}

	lm77_temp_to_sensor_value(data->temp, val);

	return 0;
	}

	static const struct sensor_driver_api lm77_driver_api = {
	.attr_set = lm77_attr_set,
	.attr_get = lm77_attr_get,
	#if LM77_TRIGGER_SUPPORT
	.trigger_set = lm77_trigger_set,
	#endif /* LM77_TRIGGER_SUPPORT */
	.sample_fetch = lm77_sample_fetch,
	.channel_get = lm77_channel_get,
	};

	static int lm77_init(const struct device *dev)
	{
	const struct lm77_config *config = dev->config;
	int err;
	#if LM77_TRIGGER_SUPPORT
	struct lm77_data *data = dev->data;
	#endif /* LM77_TRIGGER_SUPPORT */

	if (!device_is_ready(config->i2c.bus)) {
	LOG_ERR("I2c bus not ready");
	return -EINVAL;
	}

	err = lm77_write_config(dev, config->config_dt.reg);
	if (err < 0) {
	LOG_ERR("failed to write configuration (err %d)", err);
	return err;
	}

	#if LM77_TRIGGER_SUPPORT
	data->dev = dev;
	k_work_queue_start(&data->workq, data->stack, K_THREAD_STACK_SIZEOF(data->stack),
	CONFIG_LM77_TRIGGER_THREAD_PRIO, NULL);
	k_thread_name_set(&data->workq.thread, "lm77_trigger");
	k_work_init(&data->work, lm77_trigger_work_handler);

	if (config->int_gpio.port != NULL) {
	if (!device_is_ready(config->int_gpio.port)) {
	LOG_ERR("INT GPIO not ready");
	return -EINVAL;
	}

	err = gpio_pin_configure_dt(&config->int_gpio, GPIO_INPUT);
	if (err < 0) {
	LOG_ERR("failed to configure INT GPIO (err %d)", err);
	return err;
	}

	gpio_init_callback(&data->int_gpio_cb, lm77_int_gpio_callback_handler,
	BIT(config->int_gpio.pin));

	err = gpio_add_callback(config->int_gpio.port, &data->int_gpio_cb);
	if (err < 0) {
	LOG_ERR("failed to add INT GPIO callback (err %d)", err);
	return err;
	}
	}
	#endif /* LM77_TRIGGER_SUPPORT */

	return 0;
	}

	#ifdef CONFIG_PM_DEVICE
	static int lm77_pm_control(const struct device *dev, enum pm_device_action action)
	{
	const struct lm77_config *config = dev->config;
	union lm77_reg_config creg = config->config_dt;
	int err;

	switch (action) {
	case PM_DEVICE_ACTION_SUSPEND:
	creg.shutdown = 1;
	break;
	case PM_DEVICE_ACTION_RESUME:
	creg.shutdown = 0;
	break;
	default:
	return -ENOTSUP;
	}

	err = lm77_write_config(dev, creg.reg);
	if (err < 0) {
	LOG_ERR("failed to write configuration (err %d)", err);
	return err;
	}

	return 0;
	}
	#endif /* CONFIG_PM_DEVICE */

	#if LM77_TRIGGER_SUPPORT
	#define LM77_INT_GPIO_INIT(n) .int_gpio = GPIO_DT_SPEC_INST_GET_OR(n, int_gpios, { 0 })
	#else /* LM77_TRIGGER_SUPPORT */
	#define LM77_INT_GPIO_INIT(n)
	#endif /* ! LM77_TRIGGER_SUPPORT */

	#ifdef CONFIG_PM_DEVICE
	#define LM77_PM_CONTROL_FUNC lm77_pm_control
	#else /* CONFIG_PM_DEVICE */
	#define LM77_PM_CONTROL_FUNC NULL
	#endif /* ! CONFIG_PM_DEVICE */

	#define LM77_INIT(n) \
	static struct lm77_data lm77_data_##n; \
	\
	static const struct lm77_config lm77_config_##n = { \
	.i2c = I2C_DT_SPEC_INST_GET(n), \
	.config_dt = { \
	.shutdown = 0, \
	.int_mode = DT_INST_NODE_HAS_PROP(n, int_gpios), \
	.tcrita_pol = DT_INST_PROP(n, tcrita_inverted), \
	.int_pol = DT_INST_PROP(n, int_inverted), \
	.fault_queue = DT_INST_PROP(n, enable_fault_queue), \
	.reserved = 0, \
	}, \
	LM77_INT_GPIO_INIT(n) \
	}; \
	\
	DEVICE_DT_INST_DEFINE(n, lm77_init, \
	LM77_PM_CONTROL_FUNC, \
	&lm77_data_##n, \
	&lm77_config_##n, POST_KERNEL, \
	CONFIG_SENSOR_INIT_PRIORITY, \
	&lm77_driver_api);

	DT_INST_FOREACH_STATUS_OKAY(LM77_INIT)