4  * SPDX-License-Identifier: Apache-2.0
113 	const struct si7210_config *config = dev->config;  in si7210_sleep()
114 	struct si7210_data *data = dev->data;  in si7210_sleep()
119 	 * the register, but they get reloaded from OTP during wake-up.  in si7210_sleep()
121 	rc = i2c_reg_write_byte_dt(&config->bus, SI7210_REG_CTRL3, 0);  in si7210_sleep()
128 	rc = i2c_reg_write_byte_dt(&config->bus, SI7210_REG_POWER_CTRL,  in si7210_sleep()
136 	data->reg_dspsigsel = 0x00;  in si7210_sleep()
137 	data->reg_arautoinc = 0x00;  in si7210_sleep()
145 	const struct si7210_config *config = dev->config;  in si7210_wakeup()
154 	rc = i2c_read_dt(&config->bus, &val, 1);  in si7210_wakeup()
156 		LOG_ERR("Failed to go wake-up chip");  in si7210_wakeup()
164  * The Si7210 device do not have a reset function, but most of the registers
184 	const struct si7210_config *config = dev->config;  in si7210_otp_reg_read_byte()
187 	rc = i2c_reg_write_byte_dt(&config->bus, SI7210_REG_OTP_ADDR, otp_reg_addr);  in si7210_otp_reg_read_byte()
193 	rc = i2c_reg_write_byte_dt(&config->bus, SI7210_REG_OTP_CTRL, SI7210_BIT_OTP_CTRL_READEN);  in si7210_otp_reg_read_byte()
200 	 * No need to check for the data availability (SI7210_REG_OTP_CTRL, bit  in si7210_otp_reg_read_byte()
204 	rc = i2c_reg_read_byte_dt(&config->bus, SI7210_REG_OTP_DATA, value);  in si7210_otp_reg_read_byte()
237 	const struct si7210_config *config = dev->config;  in si7210_set_dspsigsel()
238 	struct si7210_data *data = dev->data;  in si7210_set_dspsigsel()
241 	if (data->reg_dspsigsel == value) {  in si7210_set_dspsigsel()
245 	rc = i2c_reg_write_byte_dt(&config->bus, SI7210_REG_DSPSIGSEL, value);  in si7210_set_dspsigsel()
251 	data->reg_dspsigsel = value;  in si7210_set_dspsigsel()
259 	const struct si7210_config *config = dev->config;  in si7210_set_arautoinc()
260 	struct si7210_data *data = dev->data;  in si7210_set_arautoinc()
263 	if (data->reg_arautoinc == value) {  in si7210_set_arautoinc()
267 	rc = i2c_reg_write_byte_dt(&config->bus, SI7210_REG_ARAUTOINC, value);  in si7210_set_arautoinc()
269 		LOG_ERR("Failed to set the auto increment register");  in si7210_set_arautoinc()
273 	data->reg_arautoinc = value;  in si7210_set_arautoinc()
280 	const struct si7210_config *config = dev->config;  in si7210_sample_fetch_one()
290 	/* Enable auto increment to be able to read DSPSIGM and DSPSIGL sequentially */  in si7210_sample_fetch_one()
297 	rc = i2c_reg_write_byte_dt(&config->bus, SI7210_REG_POWER_CTRL,  in si7210_sample_fetch_one()
305 	 * No need to wait for the conversion to end, the I2C bus guarantees  in si7210_sample_fetch_one()
309 	/* Read DSPSIG in one burst as auto increment is enabled */  in si7210_sample_fetch_one()
310 	rc = i2c_burst_read_dt(&config->bus, SI7210_REG_DSPSIGM, (uint8_t *)&val, sizeof(val));  in si7210_sample_fetch_one()
323 	struct si7210_data *data = dev->data;  in si7210_sample_fetch()
336 		return -EIO;  in si7210_sample_fetch()
349 		data->temp_sample = dspsig >> 3;  in si7210_sample_fetch()
359 		data->mag_sample = dspsig;  in si7210_sample_fetch()
372 	struct si7210_data *data = dev->data;  in si7210_channel_get()
378 		tmp = data->temp_sample;  in si7210_channel_get()
380 		/* temperature_raw = -3.83e-6 * value^2 + 0.16094 * value - 279.80 */  in si7210_channel_get()
381 		tmp = (-383 * tmp * tmp) / 100 + (160940 * tmp) - 279800000;  in si7210_channel_get()
384 		tmp = (tmp * (2048 + data->otp_temp_gain)) / 2048;  in si7210_channel_get()
385 		tmp = tmp + (data->otp_temp_offset * 62500);  in si7210_channel_get()
388 		 * Additional offset of -0.222 x VDD. The datasheet recommends  in si7210_channel_get()
391 		tmp -= 732600;  in si7210_channel_get()
393 		val->val1 = tmp / 1000000;  in si7210_channel_get()
394 		val->val2 = tmp % 1000000;  in si7210_channel_get()
398 		tmp = data->mag_sample;  in si7210_channel_get()
400 		if (data->scale == si7210_scale_200G) {  in si7210_channel_get()
402 			 * Formula in mT (datasheet) for the 20mT scale: (value - 16384) * 0.00125  in si7210_channel_get()
403 			 * => Formula in G for the 200G scale: (value - 16384) * 0.0125  in si7210_channel_get()
405 			tmp = (tmp - 16384) * 12500;  in si7210_channel_get()
408 			 * Formula in mT (datasheet) for the 200mT scale: (value - 16384) * 0.0125  in si7210_channel_get()
409 			 * => Formula in G for the 2000G scale: (value - 16384) * 0.125  in si7210_channel_get()
411 			tmp = (tmp - 16384) * 1250;  in si7210_channel_get()
414 		val->val1 = tmp / 1000000;  in si7210_channel_get()
415 		val->val2 = tmp % 1000000;  in si7210_channel_get()
418 		return -ENOTSUP;  in si7210_channel_get()
437 		/* Wake-up the chip */  in si7210_pm_action()
445 		return -ENOTSUP;  in si7210_pm_action()
454 	const struct si7210_config *config = dev->config;  in si7210_init()
455 	struct si7210_data *data = dev->data;  in si7210_init()
461 	if (!device_is_ready(config->bus.bus)) {  in si7210_init()
462 		LOG_ERR("I2C bus %s not ready!", config->bus.bus->name);  in si7210_init()
463 		return -ENODEV;  in si7210_init()
469 		LOG_ERR("Failed to wake-up device");  in si7210_init()
474 	rc = i2c_reg_read_byte_dt(&config->bus, SI7210_REG_CHIPID, &chipid);  in si7210_init()
482 		return -EINVAL;  in si7210_init()
509 	LOG_INF("Found Si72%02d-%c-%02d S/N %08x, at I2C address 0x%x",  in si7210_init()
510 		part_base, rev, part_variant, sn, config->bus.addr);  in si7210_init()
513 	data->scale = (part_variant == 5 || part_variant == 15) ?  in si7210_init()
517 	rc = si7210_otp_reg_read_byte(dev, SI7210_OTPREG_TEMP_OFFSET, &data->otp_temp_offset);  in si7210_init()
521 	rc = si7210_otp_reg_read_byte(dev, SI7210_OTPREG_TEMP_GAIN, &data->otp_temp_gain);  in si7210_init()
526 	/* Reset the device */  in si7210_init()
529 		LOG_ERR("Failed to reset the device");  in si7210_init()