1 // SPDX-License-Identifier: GPL-2.0-only
6  * Zero Drift Bi-Directional Current/Power Monitor with I2C Interface
10  * Bi-Directional Current/Power Monitor with I2C Interface
14  * Bi-Directional Current/Power Monitor with I2C Interface
18  * Bi-directional Current/Power Monitor with I2C Interface
30 #include <linux/i2c.h>
32 #include <linux/hwmon-sysfs.h>
55 /* register count */
61 /* settings - depend on use case */
190 	return regmap_write(data->regmap, INA2XX_CALIBRATION,  in ina2xx_calibrate()
191 			    data->config->calibration_value);  in ina2xx_calibrate()
199 	int ret = regmap_write(data->regmap, INA2XX_CONFIG,  in ina2xx_init()
200 			       data->config->config_default);  in ina2xx_init()
210 	int ret, retry;  in ina2xx_read_reg()  local
214 	for (retry = 5; retry; retry--) {  in ina2xx_read_reg()
216 		ret = regmap_read(data->regmap, reg, regval);  in ina2xx_read_reg()
233 			ret = regmap_read(data->regmap, INA2XX_CALIBRATION,  in ina2xx_read_reg()
262 	return -ENODEV;  in ina2xx_read_reg()
273 		val = DIV_ROUND_CLOSEST((s16)regval, data->config->shunt_div);  in ina2xx_get_value()
276 		val = (regval >> data->config->bus_voltage_shift)  in ina2xx_get_value()
277 		  * data->config->bus_voltage_lsb;  in ina2xx_get_value()
281 		val = regval * data->power_lsb_uW;  in ina2xx_get_value()
285 		val = (s16)regval * data->current_lsb_uA;  in ina2xx_get_value()
308 	int err = ina2xx_read_reg(dev, attr->index, &regval);  in ina2xx_value_show()
314 			ina2xx_get_value(data, attr->index, regval));  in ina2xx_value_show()
351 		val *= data->config->shunt_div;  in ina226_alert_to_reg()
355 		val = (val * 1000) << data->config->bus_voltage_shift;  in ina226_alert_to_reg()
356 		val = DIV_ROUND_CLOSEST(val, data->config->bus_voltage_lsb);  in ina226_alert_to_reg()
359 		val = DIV_ROUND_CLOSEST(val, data->power_lsb_uW);  in ina226_alert_to_reg()
377 	mutex_lock(&data->config_lock);  in ina226_alert_show()
378 	ret = regmap_read(data->regmap, INA226_MASK_ENABLE, &regval);  in ina226_alert_show()
382 	if (regval & BIT(attr->index)) {  in ina226_alert_show()
383 		ret = regmap_read(data->regmap, INA226_ALERT_LIMIT, &regval);  in ina226_alert_show()
386 		val = ina226_reg_to_alert(data, attr->index, regval);  in ina226_alert_show()
391 	mutex_unlock(&data->config_lock);  in ina226_alert_show()
397 				  const char *buf, size_t count)  in ina226_alert_store()  argument
411 	 * if the value is non-zero.  in ina226_alert_store()
413 	mutex_lock(&data->config_lock);  in ina226_alert_store()
414 	ret = regmap_update_bits(data->regmap, INA226_MASK_ENABLE,  in ina226_alert_store()
419 	ret = regmap_write(data->regmap, INA226_ALERT_LIMIT,  in ina226_alert_store()
420 			   ina226_alert_to_reg(data, attr->index, val));  in ina226_alert_store()
425 		ret = regmap_update_bits(data->regmap, INA226_MASK_ENABLE,  in ina226_alert_store()
427 					 BIT(attr->index));  in ina226_alert_store()
432 	ret = count;  in ina226_alert_store()
434 	mutex_unlock(&data->config_lock);  in ina226_alert_store()
447 	ret = regmap_read(data->regmap, INA226_MASK_ENABLE, &regval);  in ina226_alarm_show()
451 	alarm = (regval & BIT(attr->index)) &&  in ina226_alarm_show()
465 						  data->config->shunt_div);  in ina2xx_set_shunt()
467 		return -EINVAL;  in ina2xx_set_shunt()
469 	mutex_lock(&data->config_lock);  in ina2xx_set_shunt()
470 	data->rshunt = val;  in ina2xx_set_shunt()
471 	data->current_lsb_uA = DIV_ROUND_CLOSEST(dividend, val);  in ina2xx_set_shunt()
472 	data->power_lsb_uW = data->config->power_lsb_factor *  in ina2xx_set_shunt()
473 			     data->current_lsb_uA;  in ina2xx_set_shunt()
474 	mutex_unlock(&data->config_lock);  in ina2xx_set_shunt()
484 	return snprintf(buf, PAGE_SIZE, "%li\n", data->rshunt);  in ina2xx_shunt_show()
489 				  const char *buf, size_t count)  in ina2xx_shunt_store()  argument
502 	return count;  in ina2xx_shunt_store()
507 				     const char *buf, size_t count)  in ina226_interval_store()  argument
518 		return -EINVAL;  in ina226_interval_store()
520 	status = regmap_update_bits(data->regmap, INA2XX_CONFIG,  in ina226_interval_store()
526 	return count;  in ina226_interval_store()
536 	status = regmap_read(data->regmap, INA2XX_CONFIG, &regval);  in ina226_interval_show()
572 /* over-limit power alert setting and alarm */
621 	struct device *dev = &client->dev;  in ina2xx_probe()
628 	if (client->dev.of_node)  in ina2xx_probe()
629 		chip = (enum ina2xx_ids)of_device_get_match_data(&client->dev);  in ina2xx_probe()
631 		chip = i2c_match_id(ina2xx_id, client)->driver_data;  in ina2xx_probe()
635 		return -ENOMEM;  in ina2xx_probe()
638 	data->config = &ina2xx_config[chip];  in ina2xx_probe()
639 	mutex_init(&data->config_lock);  in ina2xx_probe()
641 	if (of_property_read_u32(dev->of_node, "shunt-resistor", &val) < 0) {  in ina2xx_probe()
645 			val = pdata->shunt_uohms;  in ina2xx_probe()
652 	ina2xx_regmap_config.max_register = data->config->registers;  in ina2xx_probe()
654 	data->regmap = devm_regmap_init_i2c(client, &ina2xx_regmap_config);  in ina2xx_probe()
655 	if (IS_ERR(data->regmap)) {  in ina2xx_probe()
657 		return PTR_ERR(data->regmap);  in ina2xx_probe()
663 		return -ENODEV;  in ina2xx_probe()
666 	data->groups[group++] = &ina2xx_group;  in ina2xx_probe()
668 		data->groups[group++] = &ina226_group;  in ina2xx_probe()
670 	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,  in ina2xx_probe()
671 							   data, data->groups);  in ina2xx_probe()
676 		 client->name, data->rshunt);  in ina2xx_probe()
689 MODULE_DEVICE_TABLE(i2c, ina2xx_id);
727 MODULE_AUTHOR("Lothar Felten <l-felten@ti.com>");