blob: 44c5f0c66f5ba9886a8810fa5d6d77a26d92fb84 [file] [log] [blame]
/*
* Copyright (c) 2016 Intel Corporation
*
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT hoperf_th02
#include <zephyr/kernel.h>
#include <zephyr/device.h>
#include <zephyr/drivers/i2c.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 "th02.h"
LOG_MODULE_REGISTER(TH02, CONFIG_SENSOR_LOG_LEVEL);
static uint8_t read8(const struct i2c_dt_spec *i2c, uint8_t d)
{
uint8_t buf;
if (i2c_reg_read_byte_dt(i2c, d, &buf) < 0) {
LOG_ERR("Error reading register.");
}
return buf;
}
static int is_ready(const struct i2c_dt_spec *i2c)
{
uint8_t status;
if (i2c_reg_read_byte_dt(i2c, TH02_REG_STATUS, &status) < 0) {
LOG_ERR("error reading status register");
}
if (status & TH02_STATUS_RDY_MASK) {
return 0;
} else {
return 1;
}
}
static uint16_t get_humi(const struct i2c_dt_spec *i2c)
{
uint16_t humidity = 0U;
if (i2c_reg_write_byte_dt(i2c, TH02_REG_CONFIG, TH02_CMD_MEASURE_HUMI) < 0) {
LOG_ERR("Error writing register");
return 0;
}
while (!is_ready(i2c)) {
}
humidity = read8(i2c, TH02_REG_DATA_H) << 8;
humidity |= read8(i2c, TH02_REG_DATA_L);
humidity >>= 4;
return humidity;
}
uint16_t get_temp(const struct i2c_dt_spec *i2c)
{
uint16_t temperature = 0U;
if (i2c_reg_write_byte_dt(i2c, TH02_REG_CONFIG, TH02_CMD_MEASURE_TEMP) < 0) {
LOG_ERR("Error writing register");
return 0;
}
while (!is_ready(i2c)) {
}
temperature = read8(i2c, TH02_REG_DATA_H) << 8;
temperature |= read8(i2c, TH02_REG_DATA_L);
temperature >>= 2;
return temperature;
}
static int th02_sample_fetch(const struct device *dev,
enum sensor_channel chan)
{
struct th02_data *drv_data = dev->data;
const struct th02_config *cfg = dev->config;
__ASSERT_NO_MSG(chan == SENSOR_CHAN_ALL || chan == SENSOR_CHAN_AMBIENT_TEMP);
drv_data->t_sample = get_temp(&cfg->i2c);
LOG_INF("temp: %u", drv_data->t_sample);
drv_data->rh_sample = get_humi(&cfg->i2c);
LOG_INF("rh: %u", drv_data->rh_sample);
return 0;
}
static int th02_channel_get(const struct device *dev,
enum sensor_channel chan,
struct sensor_value *val)
{
struct th02_data *drv_data = dev->data;
__ASSERT_NO_MSG(chan == SENSOR_CHAN_AMBIENT_TEMP ||
chan == SENSOR_CHAN_HUMIDITY);
if (chan == SENSOR_CHAN_AMBIENT_TEMP) {
/* val = sample / 32 - 50 */
val->val1 = drv_data->t_sample / 32U - 50;
val->val2 = (drv_data->t_sample % 32) * (1000000 / 32);
} else if (chan == SENSOR_CHAN_HUMIDITY) {
/* val = sample / 16 -24 */
val->val1 = drv_data->rh_sample / 16U - 24;
val->val2 = (drv_data->rh_sample % 16) * (1000000 / 16);
} else {
return -ENOTSUP;
}
return 0;
}
static const struct sensor_driver_api th02_driver_api = {
.sample_fetch = th02_sample_fetch,
.channel_get = th02_channel_get,
};
static int th02_init(const struct device *dev)
{
const struct th02_config *cfg = dev->config;
if (!device_is_ready(cfg->i2c.bus)) {
LOG_ERR("Bus device is not ready");
return -ENODEV;
}
return 0;
}
#define TH02_DEFINE(inst) \
static struct th02_data th02_data_##inst; \
\
static const struct th02_config th02_config_##inst = { \
.i2c = I2C_DT_SPEC_INST_GET(inst), \
}; \
\
SENSOR_DEVICE_DT_INST_DEFINE(inst, th02_init, NULL, \
&th02_data_##inst, &th02_config_##inst, POST_KERNEL, \
CONFIG_SENSOR_INIT_PRIORITY, &th02_driver_api); \
DT_INST_FOREACH_STATUS_OKAY(TH02_DEFINE)