drivers/sensor/ams_iAQcore/iAQcore.c

/*
 * Copyright (c) 2018 Alexander Wachter.
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#define DT_DRV_COMPAT ams_iaqcore

#include <zephyr/device.h>
#include <zephyr/drivers/i2c.h>
#include <zephyr/kernel.h>
#include <zephyr/sys/byteorder.h>
#include <zephyr/sys/util.h>
#include <zephyr/drivers/sensor.h>
#include <zephyr/sys/__assert.h>
#include <zephyr/logging/log.h>

#include "iAQcore.h"

LOG_MODULE_REGISTER(IAQ_CORE, CONFIG_SENSOR_LOG_LEVEL);

static int iaqcore_sample_fetch(const struct device *dev,
				enum sensor_channel chan)
{
	struct iaq_core_data *drv_data = dev->data;
	const struct iaq_core_config *config = dev->config;
	struct iaq_registers buf;
	struct i2c_msg msg;
	int ret, tries;

	__ASSERT_NO_MSG(chan == SENSOR_CHAN_ALL);

	msg.buf = (uint8_t *)&buf;
	msg.len = sizeof(struct iaq_registers);
	msg.flags = I2C_MSG_READ | I2C_MSG_STOP;

	for (tries = 0; tries < CONFIG_IAQ_CORE_MAX_READ_RETRIES; tries++) {

		ret = i2c_transfer_dt(&config->i2c, &msg, 1);
		if (ret < 0) {
			LOG_ERR("Failed to read registers data [%d].", ret);
			return -EIO;
		}

		drv_data->status = buf.status;

		if (buf.status == 0x00) {
			drv_data->co2 = sys_be16_to_cpu(buf.co2_pred);
			drv_data->voc = sys_be16_to_cpu(buf.voc);
			drv_data->status = buf.status;
			drv_data->resistance = sys_be32_to_cpu(buf.resistance);

			return 0;
		}

		k_sleep(K_MSEC(100));
	}

	if (drv_data->status == 0x01) {
		LOG_INF("Sensor data not available");
	}

	if (drv_data->status == 0x80) {
		LOG_ERR("Sensor Error");
	}

	return -EIO;
}

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

	switch (chan) {
	case SENSOR_CHAN_CO2:
		val->val1 = drv_data->co2;
		val->val2 = 0;
		break;
	case SENSOR_CHAN_VOC:
		val->val1 = drv_data->voc;
		val->val2 = 0;
		break;
	case SENSOR_CHAN_RESISTANCE:
		val->val1 = drv_data->resistance;
		val->val2 = 0;
		break;
	default:
		return -ENOTSUP;
	}

	return 0;
}

static const struct sensor_driver_api iaq_core_driver_api = {
	.sample_fetch = iaqcore_sample_fetch,
	.channel_get = iaqcore_channel_get,
};

static int iaq_core_init(const struct device *dev)
{
	const struct iaq_core_config *config = dev->config;

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

	return 0;
}

#define IAQ_CORE_DEFINE(inst)								\
	static struct iaq_core_data iaq_core_data_##inst;				\
											\
	static const struct iaq_core_config iaq_core_config_##inst = {			\
		.i2c = I2C_DT_SPEC_INST_GET(inst),					\
	};										\
											\
	DEVICE_DT_INST_DEFINE(inst, iaq_core_init, NULL, &iaq_core_data_##inst,		\
			      &iaq_core_config_##inst, POST_KERNEL,			\
			      CONFIG_SENSOR_INIT_PRIORITY, &iaq_core_driver_api);	\

DT_INST_FOREACH_STATUS_OKAY(IAQ_CORE_DEFINE)