1 // SPDX-License-Identifier: GPL-2.0-only
3  * 1-wire client/driver for the Maxim/Dallas DS2780 Stand-Alone Fuel Gauge IC
7  * Author: Clifton Barnes <cabarnes@indesign-llc.com>
23 /* Current unit measurement in uA for a 1 milli-ohm sense resistor */
25 /* Charge unit measurement in uAh for a 1 milli-ohm sense resistor */
28 #define DS2780_USER_EEPROM_SIZE		(DS2780_EEPROM_BLOCK0_END - \
31 #define DS2780_PARAM_EEPROM_SIZE	(DS2780_EEPROM_BLOCK1_END - \
58 	return w1_ds2780_io(dev_info->w1_dev, buf, addr, count, io);  in ds2780_battery_io()
108 	ret = ds2780_store_eeprom(dev_info->w1_dev, reg);  in ds2780_save_eeprom()
112 	ret = ds2780_recall_eeprom(dev_info->w1_dev, reg);  in ds2780_save_eeprom()
165 	 * Bits 9 - 3 of the voltage value are in bits 6 - 0 of the  in ds2780_get_voltage()
167 	 * Bits 2 - 0 of the voltage value are in bits 7 - 5 of the  in ds2780_get_voltage()
194 	 * Bits 9 - 3 of the temperature value are in bits 6 - 0 of the  in ds2780_get_temperature()
196 	 * Bits 2 - 0 of the temperature value are in bits 7 - 5 of the  in ds2780_get_temperature()
230 		dev_err(dev_info->dev, "sense resistor value is 0\n");  in ds2780_get_current()
231 		return -EINVAL;  in ds2780_get_current()
240 		return -EINVAL;  in ds2780_get_current()
246 	 * Bits 14 - 8 of the current value are in bits 6 - 0 of the current  in ds2780_get_current()
248 	 * Bits 7 - 0 of the current value are in bits 7 - 0 of the current  in ds2780_get_current()
275 		dev_err(dev_info->dev, "sense resistor value is 0\n");  in ds2780_get_accumulated_current()
276 		return -ENXIO;  in ds2780_get_accumulated_current()
283 	 * Bits 15 - 8 of the ACR value are in bits 7 - 0 of the ACR  in ds2780_get_accumulated_current()
285 	 * Bits 7 - 0 of the ACR value are in bits 7 - 0 of the ACR  in ds2780_get_accumulated_current()
343 	 * Bits 15 - 8 of the RAAC value are in bits 7 - 0 of the RAAC  in ds2780_get_charge_now()
345 	 * Bits 7 - 0 of the RAAC value are in bits 7 - 0 of the RAAC  in ds2780_get_charge_now()
384 		ret = ds2780_get_voltage(dev_info, &val->intval);  in ds2780_battery_get_property()
388 		ret = ds2780_get_temperature(dev_info, &val->intval);  in ds2780_battery_get_property()
392 		val->strval = model;  in ds2780_battery_get_property()
396 		val->strval = manufacturer;  in ds2780_battery_get_property()
400 		ret = ds2780_get_current(dev_info, CURRENT_NOW, &val->intval);  in ds2780_battery_get_property()
404 		ret = ds2780_get_current(dev_info, CURRENT_AVG, &val->intval);  in ds2780_battery_get_property()
408 		ret = ds2780_get_status(dev_info, &val->intval);  in ds2780_battery_get_property()
412 		ret = ds2780_get_capacity(dev_info, &val->intval);  in ds2780_battery_get_property()
416 		ret = ds2780_get_accumulated_current(dev_info, &val->intval);  in ds2780_battery_get_property()
420 		ret = ds2780_get_charge_now(dev_info, &val->intval);  in ds2780_battery_get_property()
424 		ret = -EINVAL;  in ds2780_battery_get_property()
481 		dev_err(dev_info->dev, "Invalid pmod setting (0 or 1)\n");  in ds2780_set_pmod_enabled()
482 		return -EINVAL;  in ds2780_set_pmod_enabled()
565 	/* Gain can only be from 0 to 1.999 in steps of .001 */  in ds2780_set_rsgain_setting()
567 		dev_err(dev_info->dev, "Invalid rsgain setting (0 - 1999)\n");  in ds2780_set_rsgain_setting()
568 		return -EINVAL;  in ds2780_set_rsgain_setting()
610 		dev_err(dev_info->dev, "Invalid pio_pin setting (0 or 1)\n");  in ds2780_set_pio_pin()
611 		return -EINVAL;  in ds2780_set_pio_pin()
750 	dev_info = devm_kzalloc(&pdev->dev, sizeof(*dev_info), GFP_KERNEL);  in ds2780_battery_probe()
752 		return -ENOMEM;  in ds2780_battery_probe()
756 	dev_info->dev			= &pdev->dev;  in ds2780_battery_probe()
757 	dev_info->w1_dev		= pdev->dev.parent;  in ds2780_battery_probe()
758 	dev_info->bat_desc.name		= dev_name(&pdev->dev);  in ds2780_battery_probe()
759 	dev_info->bat_desc.type		= POWER_SUPPLY_TYPE_BATTERY;  in ds2780_battery_probe()
760 	dev_info->bat_desc.properties	= ds2780_battery_props;  in ds2780_battery_probe()
761 	dev_info->bat_desc.num_properties = ARRAY_SIZE(ds2780_battery_props);  in ds2780_battery_probe()
762 	dev_info->bat_desc.get_property	= ds2780_battery_get_property;  in ds2780_battery_probe()
767 	dev_info->bat = devm_power_supply_register(&pdev->dev,  in ds2780_battery_probe()
768 						   &dev_info->bat_desc,  in ds2780_battery_probe()
770 	if (IS_ERR(dev_info->bat)) {  in ds2780_battery_probe()
771 		dev_err(dev_info->dev, "failed to register battery\n");  in ds2780_battery_probe()
772 		return PTR_ERR(dev_info->bat);  in ds2780_battery_probe()
780 		.name = "ds2780-battery",
788 MODULE_AUTHOR("Clifton Barnes <cabarnes@indesign-llc.com>");
789 MODULE_DESCRIPTION("Maxim/Dallas DS2780 Stand-Alone Fuel Gauge IC driver");
790 MODULE_ALIAS("platform:ds2780-battery");