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
56 /* settings - depend on use case */
74 /* bit number of alert functions in Mask/Enable Register */
81 /* bit mask for alert config bits of Mask/Enable Register */
218 		val = DIV_ROUND_CLOSEST((s16)regval, data->config->shunt_div);  in ina2xx_get_value()
221 		val = (regval >> data->config->bus_voltage_shift) *  in ina2xx_get_value()
222 		  data->config->bus_voltage_lsb;  in ina2xx_get_value()
226 		val = regval * data->power_lsb_uW;  in ina2xx_get_value()
230 		val = (s16)regval * data->current_lsb_uA;  in ina2xx_get_value()
248  * check if the chip has been power cycled or reset. If so, re-initialize it.
253 	struct regmap *regmap = data->regmap;  in ina2xx_read_init()
257 	for (retry = 5; retry; retry--) {  in ina2xx_read_init()
302 	return -ENODEV;  in ina2xx_read_init()
306  * Turns alert limit values into register values.
313 		val = clamp_val(val, 0, SHRT_MAX * data->config->shunt_div);  in ina226_alert_to_reg()
314 		val *= data->config->shunt_div;  in ina226_alert_to_reg()
318 		val = (val * 1000) << data->config->bus_voltage_shift;  in ina226_alert_to_reg()
319 		val = DIV_ROUND_CLOSEST(val, data->config->bus_voltage_lsb);  in ina226_alert_to_reg()
322 		val = clamp_val(val, 0, UINT_MAX - data->power_lsb_uW);  in ina226_alert_to_reg()
323 		val = DIV_ROUND_CLOSEST(val, data->power_lsb_uW);  in ina226_alert_to_reg()
328 		val = DIV_ROUND_CLOSEST(val * 1000, data->current_lsb_uA);  in ina226_alert_to_reg()
339 	struct regmap *regmap = data->regmap;  in ina226_alert_limit_read()
343 	mutex_lock(&data->config_lock);  in ina226_alert_limit_read()
357 	mutex_unlock(&data->config_lock);  in ina226_alert_limit_read()
363 	struct regmap *regmap = data->regmap;  in ina226_alert_limit_write()
367 		return -EINVAL;  in ina226_alert_limit_write()
370 	 * Clear all alerts first to avoid accidentally triggering ALERT pin  in ina226_alert_limit_write()
371 	 * due to register write sequence. Then, only enable the alert  in ina226_alert_limit_write()
372 	 * if the value is non-zero.  in ina226_alert_limit_write()
374 	mutex_lock(&data->config_lock);  in ina226_alert_limit_write()
389 	mutex_unlock(&data->config_lock);  in ina226_alert_limit_write()
401 		ret = regmap_read(data->regmap, INA2XX_CONFIG, &regval);  in ina2xx_chip_read()
408 		return -EOPNOTSUPP;  in ina2xx_chip_read()
435 	struct regmap *regmap = data->regmap;  in ina2xx_in_read()
457 		return -EOPNOTSUPP;  in ina2xx_in_read()
473 		return ina226_alert_read(data->regmap, INA226_POWER_OVER_LIMIT_MASK, val);  in ina2xx_power_read()
475 		return -EOPNOTSUPP;  in ina2xx_power_read()
482 	struct regmap *regmap = data->regmap;  in ina2xx_curr_read()
519 		return -EOPNOTSUPP;  in ina2xx_curr_read()
536 		return -EOPNOTSUPP;  in ina2xx_read()
546 		return regmap_update_bits(data->regmap, INA2XX_CONFIG,  in ina2xx_chip_write()
550 		return -EOPNOTSUPP;  in ina2xx_chip_write()
570 		return -EOPNOTSUPP;  in ina2xx_in_write()
584 		return -EOPNOTSUPP;  in ina2xx_power_write()
601 		return -EOPNOTSUPP;  in ina2xx_curr_write()
619 		return -EOPNOTSUPP;  in ina2xx_write()
627 	enum ina2xx_ids chip = data->chip;  in ina2xx_is_visible()
736 						  data->config->shunt_div);  in ina2xx_set_shunt()
738 		return -EINVAL;  in ina2xx_set_shunt()
740 	data->rshunt = val;  in ina2xx_set_shunt()
741 	data->current_lsb_uA = DIV_ROUND_CLOSEST(dividend, val);  in ina2xx_set_shunt()
742 	data->power_lsb_uW = data->config->power_lsb_factor *  in ina2xx_set_shunt()
743 			     data->current_lsb_uA;  in ina2xx_set_shunt()
753 	return sysfs_emit(buf, "%li\n", data->rshunt);  in shunt_resistor_show()
768 	mutex_lock(&data->config_lock);  in shunt_resistor_store()
770 	mutex_unlock(&data->config_lock);  in shunt_resistor_store()
790 	struct regmap *regmap = data->regmap;  in ina2xx_init()
794 	if (device_property_read_u32(dev, "shunt-resistor", &shunt) < 0)  in ina2xx_init()
801 	ret = regmap_write(regmap, INA2XX_CONFIG, data->config->config_default);  in ina2xx_init()
805 	if (data->chip == ina226) {  in ina2xx_init()
806 		bool active_high = device_property_read_bool(dev, "ti,alert-polarity-active-high");  in ina2xx_init()
821 			    data->config->calibration_value);  in ina2xx_init()
826 	struct device *dev = &client->dev;  in ina2xx_probe()
836 		return -ENOMEM;  in ina2xx_probe()
839 	data->config = &ina2xx_config[chip];  in ina2xx_probe()
840 	data->chip = chip;  in ina2xx_probe()
841 	mutex_init(&data->config_lock);  in ina2xx_probe()
843 	data->regmap = devm_regmap_init_i2c(client, &ina2xx_regmap_config);  in ina2xx_probe()
844 	if (IS_ERR(data->regmap)) {  in ina2xx_probe()
846 		return PTR_ERR(data->regmap);  in ina2xx_probe()
857 	hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,  in ina2xx_probe()
864 		 client->name, data->rshunt);  in ina2xx_probe()
915 MODULE_AUTHOR("Lothar Felten <l-felten@ti.com>");