1 // SPDX-License-Identifier: GPL-2.0-only
3  * I2C client/driver for the Maxim/Dallas DS2782 Stand-Alone Fuel Gauge IC
35 /* Current unit measurement in uA for a 1 milli-ohm sense resistor */
73 	ret = i2c_smbus_read_byte_data(info->client, reg);  in ds278x_read_reg()
75 		dev_err(&info->client->dev, "register read failed\n");  in ds278x_read_reg()
88 	ret = i2c_smbus_read_word_data(info->client, reg_msb);  in ds278x_read_reg16()
90 		dev_err(&info->client->dev, "register read failed\n");  in ds278x_read_reg16()
131 		dev_err(&info->client->dev, "sense resistor value is 0\n");  in ds2782_get_current()
132 		return -ENXIO;  in ds2782_get_current()
136 	dev_dbg(&info->client->dev, "sense resistor = %d milli-ohms\n",  in ds2782_get_current()
152 	 * a 10-bit number plus sign, in the upper bits of a 16-bit register  in ds2782_get_voltage()
181 	*current_uA = (raw / 16) * (DS2786_CURRENT_UNITS / info->rsns);  in ds2786_get_current()
192 	 * a 12-bit number plus sign, in the upper bits of a 16-bit register  in ds2786_get_voltage()
220 	err = info->ops->get_battery_current(info, &current_uA);  in ds278x_get_status()
224 	err = info->ops->get_battery_capacity(info, &capacity);  in ds278x_get_status()
228 	info->capacity = capacity;  in ds278x_get_status()
251 		ret = ds278x_get_status(info, &val->intval);  in ds278x_battery_get_property()
255 		ret = info->ops->get_battery_capacity(info, &val->intval);  in ds278x_battery_get_property()
259 		ret = info->ops->get_battery_voltage(info, &val->intval);  in ds278x_battery_get_property()
263 		ret = info->ops->get_battery_current(info, &val->intval);  in ds278x_battery_get_property()
267 		ret = ds278x_get_temp(info, &val->intval);  in ds278x_battery_get_property()
271 		ret = -EINVAL;  in ds278x_battery_get_property()
279 	int old_status = info->status;  in ds278x_bat_update()
280 	int old_capacity = info->capacity;  in ds278x_bat_update()
282 	ds278x_get_status(info, &info->status);  in ds278x_bat_update()
284 	if ((old_status != info->status) || (old_capacity != info->capacity))  in ds278x_bat_update()
285 		power_supply_changed(info->battery);  in ds278x_bat_update()
295 	schedule_delayed_work(&info->bat_work, DS278x_DELAY);  in ds278x_bat_work()
308 	battery->type			= POWER_SUPPLY_TYPE_BATTERY;  in ds278x_power_supply_init()
309 	battery->properties		= ds278x_battery_props;  in ds278x_power_supply_init()
310 	battery->num_properties		= ARRAY_SIZE(ds278x_battery_props);  in ds278x_power_supply_init()
311 	battery->get_property		= ds278x_battery_get_property;  in ds278x_power_supply_init()
312 	battery->external_power_changed	= NULL;  in ds278x_power_supply_init()
318 	int id = info->id;  in ds278x_battery_remove()
320 	power_supply_unregister(info->battery);  in ds278x_battery_remove()
321 	cancel_delayed_work_sync(&info->bat_work);  in ds278x_battery_remove()
322 	kfree(info->battery_desc.name);  in ds278x_battery_remove()
337 	cancel_delayed_work(&info->bat_work);  in ds278x_suspend()
346 	schedule_delayed_work(&info->bat_work, DS278x_DELAY);  in ds278x_resume()
374 	struct ds278x_platform_data *pdata = client->dev.platform_data;  in ds278x_battery_probe()
384 	if (id->driver_data == DS2786 && !pdata) {  in ds278x_battery_probe()
385 		dev_err(&client->dev, "missing platform data for ds2786\n");  in ds278x_battery_probe()
386 		return -EINVAL;  in ds278x_battery_probe()
399 		ret = -ENOMEM;  in ds278x_battery_probe()
403 	info->battery_desc.name = kasprintf(GFP_KERNEL, "%s-%d",  in ds278x_battery_probe()
404 					    client->name, num);  in ds278x_battery_probe()
405 	if (!info->battery_desc.name) {  in ds278x_battery_probe()
406 		ret = -ENOMEM;  in ds278x_battery_probe()
410 	if (id->driver_data == DS2786)  in ds278x_battery_probe()
411 		info->rsns = pdata->rsns;  in ds278x_battery_probe()
414 	info->client = client;  in ds278x_battery_probe()
415 	info->id = num;  in ds278x_battery_probe()
416 	info->ops  = &ds278x_ops[id->driver_data];  in ds278x_battery_probe()
417 	ds278x_power_supply_init(&info->battery_desc);  in ds278x_battery_probe()
420 	info->capacity = 100;  in ds278x_battery_probe()
421 	info->status = POWER_SUPPLY_STATUS_FULL;  in ds278x_battery_probe()
423 	INIT_DELAYED_WORK(&info->bat_work, ds278x_bat_work);  in ds278x_battery_probe()
425 	info->battery = power_supply_register(&client->dev,  in ds278x_battery_probe()
426 					      &info->battery_desc, &psy_cfg);  in ds278x_battery_probe()
427 	if (IS_ERR(info->battery)) {  in ds278x_battery_probe()
428 		dev_err(&client->dev, "failed to register battery\n");  in ds278x_battery_probe()
429 		ret = PTR_ERR(info->battery);  in ds278x_battery_probe()
432 		schedule_delayed_work(&info->bat_work, DS278x_DELAY);  in ds278x_battery_probe()
438 	kfree(info->battery_desc.name);  in ds278x_battery_probe()
458 		.name	= "ds2782-battery",
468 MODULE_DESCRIPTION("Maxim/Dallas DS2782 Stand-Alone Fuel Gauge IC driver");