drivers/fuel_gauge/sbs_gauge/sbs_gauge.c - third_party/github/zephyrproject-rtos/zephyr - Git at Google

 /*
  * Copyright (c) 2022 Leica Geosystems AG
  *
  * Copyright 2022 Google LLC
  * Copyright 2023 Microsoft Corporation
  *
  * SPDX-License-Identifier: Apache-2.0
  */

 #define DT_DRV_COMPAT sbs_sbs_gauge_new_api

 #include "sbs_gauge.h"

 #include <zephyr/drivers/fuel_gauge.h>
 #include <zephyr/drivers/i2c.h>
 #include <zephyr/logging/log.h>
 #include <zephyr/sys/byteorder.h>

 LOG_MODULE_REGISTER(sbs_gauge);

 static int sbs_cmd_reg_read(const struct device *dev, uint8_t reg_addr, uint16_t *val)
 {
 	const struct sbs_gauge_config *cfg;
 	uint8_t i2c_data[2];
 	int status;

 	cfg = dev->config;
 	status = i2c_burst_read_dt(&cfg->i2c, reg_addr, i2c_data, ARRAY_SIZE(i2c_data));
 	if (status < 0) {
 		LOG_ERR("Unable to read register");
 		return status;
 	}

 	*val = sys_get_le16(i2c_data);

 	return 0;
 }

 static int sbs_cmd_reg_write(const struct device *dev, uint8_t reg_addr, uint16_t val)
 {
 	const struct sbs_gauge_config *config = dev->config;
 	uint8_t buf[2];

 	sys_put_le16(val, buf);

 	return i2c_burst_write_dt(&config->i2c, reg_addr, buf, sizeof(buf));
 }

 static int sbs_cmd_buffer_read(const struct device *dev, uint8_t reg_addr, char *buffer,
 			      const uint8_t buffer_size)
 {
 	const struct sbs_gauge_config *cfg;
 	int status;

 	cfg = dev->config;
 	status = i2c_burst_read_dt(&cfg->i2c, reg_addr, buffer, buffer_size);
 	if (status < 0) {
 		LOG_ERR("Unable to read register");
 		return status;
 	}

 	return 0;
 }

 static int sbs_gauge_get_prop(const struct device *dev, struct fuel_gauge_get_property *prop)
 {
 	int rc = 0;
 	uint16_t val = 0;

 	switch (prop->property_type) {
 	case FUEL_GAUGE_AVG_CURRENT:
 		rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_AVG_CURRENT, &val);
 		prop->value.avg_current = val * 1000;
 		break;
 	case FUEL_GAUGE_CYCLE_COUNT:
 		rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_CYCLE_COUNT, &val);
 		prop->value.cycle_count = val;
 		break;
 	case FUEL_GAUGE_CURRENT:
 		rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_CURRENT, &val);
 		prop->value.current = val * 1000;
 		break;
 	case FUEL_GAUGE_FULL_CHARGE_CAPACITY:
 		rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_FULL_CAPACITY, &val);
 		prop->value.full_charge_capacity = val * 1000;
 		break;
 	case FUEL_GAUGE_REMAINING_CAPACITY:
 		rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_REM_CAPACITY, &val);
 		prop->value.remaining_capacity = val * 1000;
 		break;
 	case FUEL_GAUGE_RUNTIME_TO_EMPTY:
 		rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_RUNTIME2EMPTY, &val);
 		prop->value.runtime_to_empty = val;
 		break;
 	case FUEL_GAUGE_RUNTIME_TO_FULL:
 		rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_AVG_TIME2FULL, &val);
 		prop->value.runtime_to_full = val;
 		break;
 	case FUEL_GAUGE_SBS_MFR_ACCESS:
 		rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_MANUFACTURER_ACCESS, &val);
 		prop->value.sbs_mfr_access_word = val;
 		break;
 	case FUEL_GAUGE_ABSOLUTE_STATE_OF_CHARGE:
 		rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_ASOC, &val);
 		prop->value.absolute_state_of_charge = val;
 		break;
 	case FUEL_GAUGE_RELATIVE_STATE_OF_CHARGE:
 		rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_RSOC, &val);
 		prop->value.relative_state_of_charge = val;
 		break;
 	case FUEL_GAUGE_TEMPERATURE:
 		rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_TEMP, &val);
 		prop->value.temperature = val;
 		break;
 	case FUEL_GAUGE_VOLTAGE:
 		rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_VOLTAGE, &val);
 		prop->value.voltage = val * 1000;
 		break;
 	case FUEL_GAUGE_SBS_MODE:
 		rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_BATTERY_MODE, &val);
 		prop->value.sbs_mode = val;
 		break;
 	case FUEL_GAUGE_CHARGE_CURRENT:
 		rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_CHG_CURRENT, &val);
 		prop->value.chg_current = val;
 		break;
 	case FUEL_GAUGE_CHARGE_VOLTAGE:
 		rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_CHG_VOLTAGE, &val);
 		prop->value.chg_voltage = val;
 		break;
 	case FUEL_GAUGE_STATUS:
 		rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_FLAGS, &val);
 		prop->value.fg_status = val;
 		break;
 	case FUEL_GAUGE_DESIGN_CAPACITY:
 		rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_NOM_CAPACITY, &val);
 		prop->value.design_cap = val;
 		break;
 	case FUEL_GAUGE_DESIGN_VOLTAGE:
 		rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_DESIGN_VOLTAGE, &val);
 		prop->value.design_volt = val;
 		break;
 	case FUEL_GAUGE_SBS_ATRATE:
 		rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_AR, &val);
 		prop->value.sbs_at_rate = val;
 		break;
 	case FUEL_GAUGE_SBS_ATRATE_TIME_TO_FULL:
 		rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_ARTTF, &val);
 		prop->value.sbs_at_rate_time_to_full = val;
 		break;
 	case FUEL_GAUGE_SBS_ATRATE_TIME_TO_EMPTY:
 		rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_ARTTE, &val);
 		prop->value.sbs_at_rate_time_to_empty = val;
 		break;
 	case FUEL_GAUGE_SBS_ATRATE_OK:
 		rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_AROK, &val);
 		prop->value.sbs_at_rate_ok = val;
 		break;
 	case FUEL_GAUGE_SBS_REMAINING_CAPACITY_ALARM:
 		rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_REM_CAPACITY_ALARM, &val);
 		prop->value.sbs_remaining_capacity_alarm = val;
 		break;
 	case FUEL_GAUGE_SBS_REMAINING_TIME_ALARM:
 		rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_REM_TIME_ALARM, &val);
 		prop->value.sbs_remaining_time_alarm = val;
 		break;
 	default:
 		rc = -ENOTSUP;
 	}

 	prop->status = rc;

 	return rc;
 }

 static int sbs_gauge_set_prop(const struct device *dev, struct fuel_gauge_set_property *prop)
 {
 	int rc = 0;
 	uint16_t val = 0;

 	switch (prop->property_type) {

 	case FUEL_GAUGE_SBS_MFR_ACCESS:
 		rc = sbs_cmd_reg_write(dev, SBS_GAUGE_CMD_MANUFACTURER_ACCESS,
 				       prop->value.sbs_mfr_access_word);
 		prop->value.sbs_mfr_access_word = val;
 		break;
 	case FUEL_GAUGE_SBS_REMAINING_CAPACITY_ALARM:
 		rc = sbs_cmd_reg_write(dev, SBS_GAUGE_CMD_REM_CAPACITY_ALARM,
 				       prop->value.sbs_remaining_capacity_alarm);
 		prop->value.sbs_remaining_capacity_alarm = val;
 		break;
 	case FUEL_GAUGE_SBS_REMAINING_TIME_ALARM:
 		rc = sbs_cmd_reg_write(dev, SBS_GAUGE_CMD_REM_TIME_ALARM,
 				       prop->value.sbs_remaining_time_alarm);
 		prop->value.sbs_remaining_time_alarm = val;
 		break;
 	case FUEL_GAUGE_SBS_MODE:
 		rc = sbs_cmd_reg_write(dev, SBS_GAUGE_CMD_BATTERY_MODE, prop->value.sbs_mode);
 		prop->value.sbs_mode = val;
 		break;
 	case FUEL_GAUGE_SBS_ATRATE:
 		rc = sbs_cmd_reg_write(dev, SBS_GAUGE_CMD_AR, prop->value.sbs_at_rate);
 		prop->value.sbs_at_rate = val;
 		break;

 	default:
 		rc = -ENOTSUP;
 	}

 	prop->status = rc;

 	return rc;
 }

 static int sbs_gauge_get_buffer_prop(const struct device *dev,
 				    struct fuel_gauge_get_buffer_property *prop, void *dst,
 				    size_t dst_len)
 {
 	int rc = 0;

 	switch (prop->property_type) {
 	case FUEL_GAUGE_MANUFACTURER_NAME:
 		if (dst_len == sizeof(struct sbs_gauge_manufacturer_name)) {
 			rc = sbs_cmd_buffer_read(dev, SBS_GAUGE_CMD_MANUFACTURER_NAME, (char *)dst,
 						dst_len);
 		} else {
 			rc = -EINVAL;
 		}
 		break;
 	case FUEL_GAUGE_DEVICE_NAME:
 		if (dst_len == sizeof(struct sbs_gauge_device_name)) {
 			rc = sbs_cmd_buffer_read(dev, SBS_GAUGE_CMD_DEVICE_NAME, (char *)dst,
 						dst_len);
 		} else {
 			rc = -EINVAL;
 		}
 		break;
 	case FUEL_GAUGE_DEVICE_CHEMISTRY:
 		if (dst_len == sizeof(struct sbs_gauge_device_chemistry)) {
 			rc = sbs_cmd_buffer_read(dev, SBS_GAUGE_CMD_DEVICE_CHEMISTRY, (char *)dst,
 						dst_len);
 		} else {
 			rc = -EINVAL;
 		}
 		break;
 	default:
 		rc = -ENOTSUP;
 	}

 	prop->status = rc;
 	return rc;
 }

 static int sbs_gauge_get_props(const struct device *dev, struct fuel_gauge_get_property *props,
 			       size_t len)
 {
 	int err_count = 0;

 	for (int i = 0; i < len; i++) {
 		int ret = sbs_gauge_get_prop(dev, props + i);

 		err_count += ret ? 1 : 0;
 	}

 	err_count = (err_count == len) ? -1 : err_count;

 	return err_count;
 }

 static int sbs_gauge_set_props(const struct device *dev, struct fuel_gauge_set_property *props,
 			       size_t len)
 {
 	int err_count = 0;

 	for (int i = 0; i < len; i++) {
 		int ret = sbs_gauge_set_prop(dev, props + i);

 		err_count += ret ? 1 : 0;
 	}

 	err_count = (err_count == len) ? -1 : err_count;

 	return err_count;
 }

 /**
  * @brief initialize the fuel gauge
  *
  * @return 0 for success
  */
 static int sbs_gauge_init(const struct device *dev)
 {
 	const struct sbs_gauge_config *cfg;

 	cfg = dev->config;

 	if (!device_is_ready(cfg->i2c.bus)) {
 		LOG_ERR("Bus device is not ready");
 		return -ENODEV;
 	}

 	return 0;
 }

 static const struct fuel_gauge_driver_api sbs_gauge_driver_api = {
 	.get_property = &sbs_gauge_get_props,
 	.set_property = &sbs_gauge_set_props,
 	.get_buffer_property = &sbs_gauge_get_buffer_prop,
 };

 /* FIXME: fix init priority */
 #define SBS_GAUGE_INIT(index)                                                                      \
                                                                                                    \
 	static const struct sbs_gauge_config sbs_gauge_config_##index = {                          \
 		.i2c = I2C_DT_SPEC_INST_GET(index),                                                \
 	};                                                                                         \
                                                                                                    \
 	DEVICE_DT_INST_DEFINE(index, &sbs_gauge_init, NULL, NULL, &sbs_gauge_config_##index,       \
 			      POST_KERNEL, CONFIG_FUEL_GAUGE_INIT_PRIORITY,                        \
 			      &sbs_gauge_driver_api);

 DT_INST_FOREACH_STATUS_OKAY(SBS_GAUGE_INIT)
	/*
	* Copyright (c) 2022 Leica Geosystems AG
	*
	* Copyright 2022 Google LLC
	* Copyright 2023 Microsoft Corporation
	*
	* SPDX-License-Identifier: Apache-2.0
	*/

	#define DT_DRV_COMPAT sbs_sbs_gauge_new_api

	#include "sbs_gauge.h"

	#include <zephyr/drivers/fuel_gauge.h>
	#include <zephyr/drivers/i2c.h>
	#include <zephyr/logging/log.h>
	#include <zephyr/sys/byteorder.h>

	LOG_MODULE_REGISTER(sbs_gauge);

	static int sbs_cmd_reg_read(const struct device dev, uint8_t reg_addr, uint16_t val)
	{
	const struct sbs_gauge_config *cfg;
	uint8_t i2c_data[2];
	int status;

	cfg = dev->config;
	status = i2c_burst_read_dt(&cfg->i2c, reg_addr, i2c_data, ARRAY_SIZE(i2c_data));
	if (status < 0) {
	LOG_ERR("Unable to read register");
	return status;
	}

	*val = sys_get_le16(i2c_data);

	return 0;
	}

	static int sbs_cmd_reg_write(const struct device *dev, uint8_t reg_addr, uint16_t val)
	{
	const struct sbs_gauge_config *config = dev->config;
	uint8_t buf[2];

	sys_put_le16(val, buf);

	return i2c_burst_write_dt(&config->i2c, reg_addr, buf, sizeof(buf));
	}

	static int sbs_cmd_buffer_read(const struct device dev, uint8_t reg_addr, char buffer,
	const uint8_t buffer_size)
	{
	const struct sbs_gauge_config *cfg;
	int status;

	cfg = dev->config;
	status = i2c_burst_read_dt(&cfg->i2c, reg_addr, buffer, buffer_size);
	if (status < 0) {
	LOG_ERR("Unable to read register");
	return status;
	}

	return 0;
	}

	static int sbs_gauge_get_prop(const struct device dev, struct fuel_gauge_get_property prop)
	{
	int rc = 0;
	uint16_t val = 0;

	switch (prop->property_type) {
	case FUEL_GAUGE_AVG_CURRENT:
	rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_AVG_CURRENT, &val);
	prop->value.avg_current = val * 1000;
	break;
	case FUEL_GAUGE_CYCLE_COUNT:
	rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_CYCLE_COUNT, &val);
	prop->value.cycle_count = val;
	break;
	case FUEL_GAUGE_CURRENT:
	rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_CURRENT, &val);
	prop->value.current = val * 1000;
	break;
	case FUEL_GAUGE_FULL_CHARGE_CAPACITY:
	rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_FULL_CAPACITY, &val);
	prop->value.full_charge_capacity = val * 1000;
	break;
	case FUEL_GAUGE_REMAINING_CAPACITY:
	rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_REM_CAPACITY, &val);
	prop->value.remaining_capacity = val * 1000;
	break;
	case FUEL_GAUGE_RUNTIME_TO_EMPTY:
	rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_RUNTIME2EMPTY, &val);
	prop->value.runtime_to_empty = val;
	break;
	case FUEL_GAUGE_RUNTIME_TO_FULL:
	rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_AVG_TIME2FULL, &val);
	prop->value.runtime_to_full = val;
	break;
	case FUEL_GAUGE_SBS_MFR_ACCESS:
	rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_MANUFACTURER_ACCESS, &val);
	prop->value.sbs_mfr_access_word = val;
	break;
	case FUEL_GAUGE_ABSOLUTE_STATE_OF_CHARGE:
	rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_ASOC, &val);
	prop->value.absolute_state_of_charge = val;
	break;
	case FUEL_GAUGE_RELATIVE_STATE_OF_CHARGE:
	rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_RSOC, &val);
	prop->value.relative_state_of_charge = val;
	break;
	case FUEL_GAUGE_TEMPERATURE:
	rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_TEMP, &val);
	prop->value.temperature = val;
	break;
	case FUEL_GAUGE_VOLTAGE:
	rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_VOLTAGE, &val);
	prop->value.voltage = val * 1000;
	break;
	case FUEL_GAUGE_SBS_MODE:
	rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_BATTERY_MODE, &val);
	prop->value.sbs_mode = val;
	break;
	case FUEL_GAUGE_CHARGE_CURRENT:
	rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_CHG_CURRENT, &val);
	prop->value.chg_current = val;
	break;
	case FUEL_GAUGE_CHARGE_VOLTAGE:
	rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_CHG_VOLTAGE, &val);
	prop->value.chg_voltage = val;
	break;
	case FUEL_GAUGE_STATUS:
	rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_FLAGS, &val);
	prop->value.fg_status = val;
	break;
	case FUEL_GAUGE_DESIGN_CAPACITY:
	rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_NOM_CAPACITY, &val);
	prop->value.design_cap = val;
	break;
	case FUEL_GAUGE_DESIGN_VOLTAGE:
	rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_DESIGN_VOLTAGE, &val);
	prop->value.design_volt = val;
	break;
	case FUEL_GAUGE_SBS_ATRATE:
	rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_AR, &val);
	prop->value.sbs_at_rate = val;
	break;
	case FUEL_GAUGE_SBS_ATRATE_TIME_TO_FULL:
	rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_ARTTF, &val);
	prop->value.sbs_at_rate_time_to_full = val;
	break;
	case FUEL_GAUGE_SBS_ATRATE_TIME_TO_EMPTY:
	rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_ARTTE, &val);
	prop->value.sbs_at_rate_time_to_empty = val;
	break;
	case FUEL_GAUGE_SBS_ATRATE_OK:
	rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_AROK, &val);
	prop->value.sbs_at_rate_ok = val;
	break;
	case FUEL_GAUGE_SBS_REMAINING_CAPACITY_ALARM:
	rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_REM_CAPACITY_ALARM, &val);
	prop->value.sbs_remaining_capacity_alarm = val;
	break;
	case FUEL_GAUGE_SBS_REMAINING_TIME_ALARM:
	rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_REM_TIME_ALARM, &val);
	prop->value.sbs_remaining_time_alarm = val;
	break;
	default:
	rc = -ENOTSUP;
	}

	prop->status = rc;

	return rc;
	}

	static int sbs_gauge_set_prop(const struct device dev, struct fuel_gauge_set_property prop)
	{
	int rc = 0;
	uint16_t val = 0;

	switch (prop->property_type) {

	case FUEL_GAUGE_SBS_MFR_ACCESS:
	rc = sbs_cmd_reg_write(dev, SBS_GAUGE_CMD_MANUFACTURER_ACCESS,
	prop->value.sbs_mfr_access_word);
	prop->value.sbs_mfr_access_word = val;
	break;
	case FUEL_GAUGE_SBS_REMAINING_CAPACITY_ALARM:
	rc = sbs_cmd_reg_write(dev, SBS_GAUGE_CMD_REM_CAPACITY_ALARM,
	prop->value.sbs_remaining_capacity_alarm);
	prop->value.sbs_remaining_capacity_alarm = val;
	break;
	case FUEL_GAUGE_SBS_REMAINING_TIME_ALARM:
	rc = sbs_cmd_reg_write(dev, SBS_GAUGE_CMD_REM_TIME_ALARM,
	prop->value.sbs_remaining_time_alarm);
	prop->value.sbs_remaining_time_alarm = val;
	break;
	case FUEL_GAUGE_SBS_MODE:
	rc = sbs_cmd_reg_write(dev, SBS_GAUGE_CMD_BATTERY_MODE, prop->value.sbs_mode);
	prop->value.sbs_mode = val;
	break;
	case FUEL_GAUGE_SBS_ATRATE:
	rc = sbs_cmd_reg_write(dev, SBS_GAUGE_CMD_AR, prop->value.sbs_at_rate);
	prop->value.sbs_at_rate = val;
	break;

	default:
	rc = -ENOTSUP;
	}

	prop->status = rc;

	return rc;
	}

	static int sbs_gauge_get_buffer_prop(const struct device *dev,
	struct fuel_gauge_get_buffer_property prop, void dst,
	size_t dst_len)
	{
	int rc = 0;

	switch (prop->property_type) {
	case FUEL_GAUGE_MANUFACTURER_NAME:
	if (dst_len == sizeof(struct sbs_gauge_manufacturer_name)) {
	rc = sbs_cmd_buffer_read(dev, SBS_GAUGE_CMD_MANUFACTURER_NAME, (char *)dst,
	dst_len);
	} else {
	rc = -EINVAL;
	}
	break;
	case FUEL_GAUGE_DEVICE_NAME:
	if (dst_len == sizeof(struct sbs_gauge_device_name)) {
	rc = sbs_cmd_buffer_read(dev, SBS_GAUGE_CMD_DEVICE_NAME, (char *)dst,
	dst_len);
	} else {
	rc = -EINVAL;
	}
	break;
	case FUEL_GAUGE_DEVICE_CHEMISTRY:
	if (dst_len == sizeof(struct sbs_gauge_device_chemistry)) {
	rc = sbs_cmd_buffer_read(dev, SBS_GAUGE_CMD_DEVICE_CHEMISTRY, (char *)dst,
	dst_len);
	} else {
	rc = -EINVAL;
	}
	break;
	default:
	rc = -ENOTSUP;
	}

	prop->status = rc;
	return rc;
	}

	static int sbs_gauge_get_props(const struct device dev, struct fuel_gauge_get_property props,
	size_t len)
	{
	int err_count = 0;

	for (int i = 0; i < len; i++) {
	int ret = sbs_gauge_get_prop(dev, props + i);

	err_count += ret ? 1 : 0;
	}

	err_count = (err_count == len) ? -1 : err_count;

	return err_count;
	}

	static int sbs_gauge_set_props(const struct device dev, struct fuel_gauge_set_property props,
	size_t len)
	{
	int err_count = 0;

	for (int i = 0; i < len; i++) {
	int ret = sbs_gauge_set_prop(dev, props + i);

	err_count += ret ? 1 : 0;
	}

	err_count = (err_count == len) ? -1 : err_count;

	return err_count;
	}

	/**
	* @brief initialize the fuel gauge
	*
	* @return 0 for success
	*/
	static int sbs_gauge_init(const struct device *dev)
	{
	const struct sbs_gauge_config *cfg;

	cfg = dev->config;

	if (!device_is_ready(cfg->i2c.bus)) {
	LOG_ERR("Bus device is not ready");
	return -ENODEV;
	}

	return 0;
	}

	static const struct fuel_gauge_driver_api sbs_gauge_driver_api = {
	.get_property = &sbs_gauge_get_props,
	.set_property = &sbs_gauge_set_props,
	.get_buffer_property = &sbs_gauge_get_buffer_prop,
	};

	/* FIXME: fix init priority */
	#define SBS_GAUGE_INIT(index) \
	\
	static const struct sbs_gauge_config sbs_gauge_config_##index = { \
	.i2c = I2C_DT_SPEC_INST_GET(index), \
	}; \
	\
	DEVICE_DT_INST_DEFINE(index, &sbs_gauge_init, NULL, NULL, &sbs_gauge_config_##index, \
	POST_KERNEL, CONFIG_FUEL_GAUGE_INIT_PRIORITY, \
	&sbs_gauge_driver_api);

	DT_INST_FOREACH_STATUS_OKAY(SBS_GAUGE_INIT)