4  * SPDX-License-Identifier: Apache-2.0
35  * Reset register 0x1B, 0x1C and 0x1E
44 /** Wait some time after reset sequence (in ms) */
72 	const struct dht20_config *cfg = dev->config;  in read_status()
78 	rc = i2c_write_dt(&cfg->bus, tx_buf, sizeof(tx_buf));  in read_status()
84 	rc = i2c_read_dt(&cfg->bus, rx_buf, sizeof(rx_buf));  in read_status()
97 	const struct dht20_config *cfg = dev->config;  in reset_register()
103 	rc = i2c_write_read_dt(&cfg->bus, tx_buf, sizeof(tx_buf), rx_buf, sizeof(rx_buf));  in reset_register()
105 		LOG_ERR("Failed to reset register.");  in reset_register()
113 	rc = i2c_write_dt(&cfg->bus, tx_buf, sizeof(tx_buf));  in reset_register()
115 		LOG_ERR("Failed to reset register.");  in reset_register()
136 		 * Reset register 0x1B, 0x1C and 0x1E if status does not match expected value  in reset_sensor()
150 		/* Wait 10ms after reset sequence */  in reset_sensor()
159 	const struct dht20_config *cfg = dev->config;  in dht20_read_sample()
163 	 * +------+----------------------------------------+  in dht20_read_sample()
165 	 * +------+----------------------------------------+  in dht20_read_sample()
173 	 * +------+----------------------------------------+  in dht20_read_sample()
179 	rc = i2c_read_dt(&cfg->bus, rx_buf, sizeof(rx_buf));  in dht20_read_sample()
196 		rc = -EIO;  in dht20_read_sample()
205 	struct dht20_data *data = dev->data;  in dht20_sample_fetch()
206 	const struct dht20_config *cfg = dev->config;  in dht20_sample_fetch()
214 		return -ENOTSUP;  in dht20_sample_fetch()
217 	/* Reset sensor if needed */  in dht20_sample_fetch()
221 	rc = i2c_write_dt(&cfg->bus, tx_buf, sizeof(tx_buf));  in dht20_sample_fetch()
243 	rc = dht20_read_sample(dev, &data->t_sample, &data->rh_sample);  in dht20_sample_fetch()
252 static void dht20_temp_convert(struct sensor_value *val, uint32_t raw)  in dht20_temp_convert()  argument
258 	 * DegCT = (S / 2^20) * 200 - 50  in dht20_temp_convert()
259 	 * uDegCT = (S * 1e6 * 200 - 50 * 1e6) / (1 << 20)  in dht20_temp_convert()
261 	micro_c = ((int64_t)raw * 1000000 * 200) / BIT(20) - 50 * 1000000;  in dht20_temp_convert()
263 	val->val1 = micro_c / 1000000;  in dht20_temp_convert()
264 	val->val2 = micro_c % 1000000;  in dht20_temp_convert()
267 static void dht20_rh_convert(struct sensor_value *val, uint32_t raw)  in dht20_rh_convert()  argument
278 	val->val1 = micro_rh / 1000000;  in dht20_rh_convert()
279 	val->val2 = micro_rh % 1000000;  in dht20_rh_convert()
283 			     struct sensor_value *val)  in dht20_channel_get()  argument
285 	const struct dht20_data *data = dev->data;  in dht20_channel_get()
288 		dht20_temp_convert(val, data->t_sample);  in dht20_channel_get()
290 		dht20_rh_convert(val, data->rh_sample);  in dht20_channel_get()
292 		return -ENOTSUP;  in dht20_channel_get()
300 	const struct dht20_config *cfg = dev->config;  in dht20_init()
302 	if (!i2c_is_ready_dt(&cfg->bus)) {  in dht20_init()
303 		LOG_ERR("I2C dev %s not ready", cfg->bus.bus->name);  in dht20_init()
304 		return -ENODEV;  in dht20_init()