1 // SPDX-License-Identifier: GPL-2.0-only
3  * Driver for Texas Instruments INA219, INA226 power monitor chips
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
32 #include <linux/hwmon-sysfs.h>
60 /* settings - depend on use case */
64 /* worst case is 68.10 ms (~14.6Hz, ina219) */
66 #define INA2XX_MAX_DELAY		69 /* worst case delay in ms */
169 static u16 ina226_interval_to_reg(int interval)  in ina226_interval_to_reg()  argument
173 	avg = DIV_ROUND_CLOSEST(interval * 1000,  in ina226_interval_to_reg()
189 	return regmap_write(data->regmap, INA2XX_CALIBRATION,  in ina2xx_calibrate()
190 			    data->config->calibration_value);  in ina2xx_calibrate()
198 	int ret = regmap_write(data->regmap, INA2XX_CONFIG,  in ina2xx_init()
199 			       data->config->config_default);  in ina2xx_init()
213 	for (retry = 5; retry; retry--) {  in ina2xx_read_reg()
215 		ret = regmap_read(data->regmap, reg, regval);  in ina2xx_read_reg()
232 			ret = regmap_read(data->regmap, INA2XX_CALIBRATION,  in ina2xx_read_reg()
261 	return -ENODEV;  in ina2xx_read_reg()
272 		val = DIV_ROUND_CLOSEST((s16)regval, data->config->shunt_div);  in ina2xx_get_value()
275 		val = (regval >> data->config->bus_voltage_shift)  in ina2xx_get_value()
276 		  * data->config->bus_voltage_lsb;  in ina2xx_get_value()
280 		val = regval * data->power_lsb_uW;  in ina2xx_get_value()
284 		val = (s16)regval * data->current_lsb_uA;  in ina2xx_get_value()
307 	int err = ina2xx_read_reg(dev, attr->index, &regval);  in ina2xx_value_show()
312 	return sysfs_emit(buf, "%d\n", ina2xx_get_value(data, attr->index, regval));  in ina2xx_value_show()
349 		val *= data->config->shunt_div;  in ina226_alert_to_reg()
353 		val = (val * 1000) << data->config->bus_voltage_shift;  in ina226_alert_to_reg()
354 		val = DIV_ROUND_CLOSEST(val, data->config->bus_voltage_lsb);  in ina226_alert_to_reg()
357 		val = DIV_ROUND_CLOSEST(val, data->power_lsb_uW);  in ina226_alert_to_reg()
375 	mutex_lock(&data->config_lock);  in ina226_alert_show()
376 	ret = regmap_read(data->regmap, INA226_MASK_ENABLE, &regval);  in ina226_alert_show()
380 	if (regval & BIT(attr->index)) {  in ina226_alert_show()
381 		ret = regmap_read(data->regmap, INA226_ALERT_LIMIT, &regval);  in ina226_alert_show()
384 		val = ina226_reg_to_alert(data, attr->index, regval);  in ina226_alert_show()
389 	mutex_unlock(&data->config_lock);  in ina226_alert_show()
409 	 * if the value is non-zero.  in ina226_alert_store()
411 	mutex_lock(&data->config_lock);  in ina226_alert_store()
412 	ret = regmap_update_bits(data->regmap, INA226_MASK_ENABLE,  in ina226_alert_store()
417 	ret = regmap_write(data->regmap, INA226_ALERT_LIMIT,  in ina226_alert_store()
418 			   ina226_alert_to_reg(data, attr->index, val));  in ina226_alert_store()
423 		ret = regmap_update_bits(data->regmap, INA226_MASK_ENABLE,  in ina226_alert_store()
425 					 BIT(attr->index));  in ina226_alert_store()
432 	mutex_unlock(&data->config_lock);  in ina226_alert_store()
445 	ret = regmap_read(data->regmap, INA226_MASK_ENABLE, &regval);  in ina226_alarm_show()
449 	alarm = (regval & BIT(attr->index)) &&  in ina226_alarm_show()
463 						  data->config->shunt_div);  in ina2xx_set_shunt()
465 		return -EINVAL;  in ina2xx_set_shunt()
467 	mutex_lock(&data->config_lock);  in ina2xx_set_shunt()
468 	data->rshunt = val;  in ina2xx_set_shunt()
469 	data->current_lsb_uA = DIV_ROUND_CLOSEST(dividend, val);  in ina2xx_set_shunt()
470 	data->power_lsb_uW = data->config->power_lsb_factor *  in ina2xx_set_shunt()
471 			     data->current_lsb_uA;  in ina2xx_set_shunt()
472 	mutex_unlock(&data->config_lock);  in ina2xx_set_shunt()
482 	return sysfs_emit(buf, "%li\n", data->rshunt);  in ina2xx_shunt_show()
516 		return -EINVAL;  in ina226_interval_store()
518 	status = regmap_update_bits(data->regmap, INA2XX_CONFIG,  in ina226_interval_store()
534 	status = regmap_read(data->regmap, INA2XX_CONFIG, &regval);  in ina226_interval_show()
570 /* over-limit power alert setting and alarm */
579 /* update interval (ina226 only) */
619 	struct device *dev = &client->dev;  in ina2xx_probe()
626 	if (client->dev.of_node)  in ina2xx_probe()
627 		chip = (uintptr_t)of_device_get_match_data(&client->dev);  in ina2xx_probe()
629 		chip = i2c_match_id(ina2xx_id, client)->driver_data;  in ina2xx_probe()
633 		return -ENOMEM;  in ina2xx_probe()
636 	data->config = &ina2xx_config[chip];  in ina2xx_probe()
637 	mutex_init(&data->config_lock);  in ina2xx_probe()
639 	if (of_property_read_u32(dev->of_node, "shunt-resistor", &val) < 0) {  in ina2xx_probe()
643 			val = pdata->shunt_uohms;  in ina2xx_probe()
650 	ina2xx_regmap_config.max_register = data->config->registers;  in ina2xx_probe()
652 	data->regmap = devm_regmap_init_i2c(client, &ina2xx_regmap_config);  in ina2xx_probe()
653 	if (IS_ERR(data->regmap)) {  in ina2xx_probe()
655 		return PTR_ERR(data->regmap);  in ina2xx_probe()
665 		return -ENODEV;  in ina2xx_probe()
668 	data->groups[group++] = &ina2xx_group;  in ina2xx_probe()
670 		data->groups[group++] = &ina226_group;  in ina2xx_probe()
672 	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,  in ina2xx_probe()
673 							   data, data->groups);  in ina2xx_probe()
677 	dev_info(dev, "power monitor %s (Rshunt = %li uOhm)\n",  in ina2xx_probe()
678 		 client->name, data->rshunt);  in ina2xx_probe()
729 MODULE_AUTHOR("Lothar Felten <l-felten@ti.com>");