1 // SPDX-License-Identifier: GPL-2.0-only
3  * 1-wire client/driver for the Maxim/Dallas DS2781 Stand-Alone Fuel Gauge IC
21 /* Current unit measurement in uA for a 1 milli-ohm sense resistor */
23 /* Charge unit measurement in uAh for a 1 milli-ohm sense resistor */
26 #define DS2781_USER_EEPROM_SIZE		(DS2781_EEPROM_BLOCK0_END - \
29 #define DS2781_PARAM_EEPROM_SIZE	(DS2781_EEPROM_BLOCK1_END - \
56 	return w1_ds2781_io(dev_info->w1_dev, buf, addr, count, io);  in ds2781_battery_io()
112 	ret = ds2781_store_eeprom(dev_info->w1_dev, reg);  in ds2781_save_eeprom()
116 	ret = ds2781_recall_eeprom(dev_info->w1_dev, reg);  in ds2781_save_eeprom()
173 	 * Bits 9 - 3 of the voltage value are in bits 6 - 0 of the  in ds2781_get_voltage()
175 	 * Bits 2 - 0 of the voltage value are in bits 7 - 5 of the  in ds2781_get_voltage()
203 	 * Bits 9 - 3 of the temperature value are in bits 6 - 0 of the  in ds2781_get_temperature()
205 	 * Bits 2 - 0 of the temperature value are in bits 7 - 5 of the  in ds2781_get_temperature()
231 		dev_err(dev_info->dev, "sense resistor value is 0\n");  in ds2781_get_current()
232 		return -EINVAL;  in ds2781_get_current()
241 		return -EINVAL;  in ds2781_get_current()
247 	 * Bits 14 - 8 of the current value are in bits 6 - 0 of the current  in ds2781_get_current()
249 	 * Bits 7 - 0 of the current value are in bits 7 - 0 of the current  in ds2781_get_current()
276 		dev_err(dev_info->dev, "sense resistor value is 0\n");  in ds2781_get_accumulated_current()
277 		return -EINVAL;  in ds2781_get_accumulated_current()
284 	 * Bits 15 - 8 of the ACR value are in bits 7 - 0 of the ACR  in ds2781_get_accumulated_current()
286 	 * Bits 7 - 0 of the ACR value are in bits 7 - 0 of the ACR  in ds2781_get_accumulated_current()
323 	if (power_supply_am_i_supplied(dev_info->bat)) {  in ds2781_get_status()
345 	 * Bits 15 - 8 of the RAAC value are in bits 7 - 0 of the RAAC  in ds2781_get_charge_now()
347 	 * Bits 7 - 0 of the RAAC value are in bits 7 - 0 of the RAAC  in ds2781_get_charge_now()
386 		ret = ds2781_get_voltage(dev_info, &val->intval);  in ds2781_battery_get_property()
390 		ret = ds2781_get_temperature(dev_info, &val->intval);  in ds2781_battery_get_property()
394 		val->strval = model;  in ds2781_battery_get_property()
398 		val->strval = manufacturer;  in ds2781_battery_get_property()
402 		ret = ds2781_get_current(dev_info, CURRENT_NOW, &val->intval);  in ds2781_battery_get_property()
406 		ret = ds2781_get_current(dev_info, CURRENT_AVG, &val->intval);  in ds2781_battery_get_property()
410 		ret = ds2781_get_status(dev_info, &val->intval);  in ds2781_battery_get_property()
414 		ret = ds2781_get_capacity(dev_info, &val->intval);  in ds2781_battery_get_property()
418 		ret = ds2781_get_accumulated_current(dev_info, &val->intval);  in ds2781_battery_get_property()
422 		ret = ds2781_get_charge_now(dev_info, &val->intval);  in ds2781_battery_get_property()
426 		ret = -EINVAL;  in ds2781_battery_get_property()
483 		dev_err(dev_info->dev, "Invalid pmod setting (0 or 1)\n");  in ds2781_set_pmod_enabled()
484 		return -EINVAL;  in ds2781_set_pmod_enabled()
569 		dev_err(dev_info->dev, "Invalid rsgain setting (0 - 1999)\n");  in ds2781_set_rsgain_setting()
570 		return -EINVAL;  in ds2781_set_rsgain_setting()
612 		dev_err(dev_info->dev, "Invalid pio_pin setting (0 or 1)\n");  in ds2781_set_pio_pin()
613 		return -EINVAL;  in ds2781_set_pio_pin()
754 	dev_info = devm_kzalloc(&pdev->dev, sizeof(*dev_info), GFP_KERNEL);  in ds2781_battery_probe()
756 		return -ENOMEM;  in ds2781_battery_probe()
760 	dev_info->dev			= &pdev->dev;  in ds2781_battery_probe()
761 	dev_info->w1_dev		= pdev->dev.parent;  in ds2781_battery_probe()
762 	dev_info->bat_desc.name		= dev_name(&pdev->dev);  in ds2781_battery_probe()
763 	dev_info->bat_desc.type		= POWER_SUPPLY_TYPE_BATTERY;  in ds2781_battery_probe()
764 	dev_info->bat_desc.properties	= ds2781_battery_props;  in ds2781_battery_probe()
765 	dev_info->bat_desc.num_properties = ARRAY_SIZE(ds2781_battery_props);  in ds2781_battery_probe()
766 	dev_info->bat_desc.get_property	= ds2781_battery_get_property;  in ds2781_battery_probe()
771 	dev_info->bat = devm_power_supply_register(&pdev->dev,  in ds2781_battery_probe()
772 						   &dev_info->bat_desc,  in ds2781_battery_probe()
774 	if (IS_ERR(dev_info->bat)) {  in ds2781_battery_probe()
775 		dev_err(dev_info->dev, "failed to register battery\n");  in ds2781_battery_probe()
776 		return PTR_ERR(dev_info->bat);  in ds2781_battery_probe()
784 		.name = "ds2781-battery",
792 MODULE_DESCRIPTION("Maxim/Dallas DS2781 Stand-Alone Fuel Gauge IC driver");
793 MODULE_ALIAS("platform:ds2781-battery");