1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * max8903_charger.c - Maxim 8903 USB/Adapter Charger Driver
23 	 * chg, flt, dcm and usus are optional.
30 	struct gpio_desc *chg; /* Charger status output */  member
32 	struct gpio_desc *dcm; /* Current-Limit Mode input (1: DC, 2: USB) */
40 	POWER_SUPPLY_PROP_STATUS, /* Charger status output */
53 		val->intval = POWER_SUPPLY_STATUS_UNKNOWN;  in max8903_get_property()
54 		if (data->chg) {  in max8903_get_property()
55 			if (gpiod_get_value(data->chg))  in max8903_get_property()
56 				/* CHG asserted */  in max8903_get_property()
57 				val->intval = POWER_SUPPLY_STATUS_CHARGING;  in max8903_get_property()
58 			else if (data->usb_in || data->ta_in)  in max8903_get_property()
59 				val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;  in max8903_get_property()
61 				val->intval = POWER_SUPPLY_STATUS_DISCHARGING;  in max8903_get_property()
65 		val->intval = 0;  in max8903_get_property()
66 		if (data->usb_in || data->ta_in)  in max8903_get_property()
67 			val->intval = 1;  in max8903_get_property()
70 		val->intval = POWER_SUPPLY_HEALTH_GOOD;  in max8903_get_property()
71 		if (data->fault)  in max8903_get_property()
72 			val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;  in max8903_get_property()
75 		return -EINVAL;  in max8903_get_property()
94 	ta_in = gpiod_get_value(data->dok);  in max8903_dcin()
96 	if (ta_in == data->ta_in)  in max8903_dcin()
99 	data->ta_in = ta_in;  in max8903_dcin()
101 	/* Set Current-Limit-Mode 1:DC 0:USB */  in max8903_dcin()
102 	if (data->dcm)  in max8903_dcin()
103 		gpiod_set_value(data->dcm, ta_in);  in max8903_dcin()
106 	if (data->cen) {  in max8903_dcin()
112 		else if (data->usb_in)  in max8903_dcin()
116 			/* Else default-disable */  in max8903_dcin()
119 		gpiod_set_value(data->cen, val);  in max8903_dcin()
122 	dev_dbg(data->dev, "TA(DC-IN) Charger %s.\n", ta_in ?  in max8903_dcin()
125 	old_type = data->psy_desc.type;  in max8903_dcin()
127 	if (data->ta_in)  in max8903_dcin()
128 		data->psy_desc.type = POWER_SUPPLY_TYPE_MAINS;  in max8903_dcin()
129 	else if (data->usb_in)  in max8903_dcin()
130 		data->psy_desc.type = POWER_SUPPLY_TYPE_USB;  in max8903_dcin()
132 		data->psy_desc.type = POWER_SUPPLY_TYPE_BATTERY;  in max8903_dcin()
134 	if (old_type != data->psy_desc.type)  in max8903_dcin()
135 		power_supply_changed(data->psy);  in max8903_dcin()
153 	usb_in = gpiod_get_value(data->uok);  in max8903_usbin()
155 	if (usb_in == data->usb_in)  in max8903_usbin()
158 	data->usb_in = usb_in;  in max8903_usbin()
160 	/* Do not touch Current-Limit-Mode */  in max8903_usbin()
163 	if (data->cen) {  in max8903_usbin()
169 		else if (data->ta_in)  in max8903_usbin()
173 			/* Else default-disable */  in max8903_usbin()
176 		gpiod_set_value(data->cen, val);  in max8903_usbin()
179 	dev_dbg(data->dev, "USB Charger %s.\n", usb_in ?  in max8903_usbin()
182 	old_type = data->psy_desc.type;  in max8903_usbin()
184 	if (data->ta_in)  in max8903_usbin()
185 		data->psy_desc.type = POWER_SUPPLY_TYPE_MAINS;  in max8903_usbin()
186 	else if (data->usb_in)  in max8903_usbin()
187 		data->psy_desc.type = POWER_SUPPLY_TYPE_USB;  in max8903_usbin()
189 		data->psy_desc.type = POWER_SUPPLY_TYPE_BATTERY;  in max8903_usbin()
191 	if (old_type != data->psy_desc.type)  in max8903_usbin()
192 		power_supply_changed(data->psy);  in max8903_usbin()
209 	fault = gpiod_get_value(data->flt);  in max8903_fault()
211 	if (fault == data->fault)  in max8903_fault()
214 	data->fault = fault;  in max8903_fault()
217 		dev_err(data->dev, "Charger suffers a fault and stops.\n");  in max8903_fault()
219 		dev_err(data->dev, "Charger recovered from a fault.\n");  in max8903_fault()
227 	struct device *dev = &pdev->dev;  in max8903_setup_gpios()
232 	data->dok = devm_gpiod_get_optional(dev, "dok", GPIOD_IN);  in max8903_setup_gpios()
233 	if (IS_ERR(data->dok))  in max8903_setup_gpios()
234 		return dev_err_probe(dev, PTR_ERR(data->dok),  in max8903_setup_gpios()
236 	if (data->dok) {  in max8903_setup_gpios()
237 		gpiod_set_consumer_name(data->dok, data->psy_desc.name);  in max8903_setup_gpios()
244 		ta_in = gpiod_get_value(data->dok);  in max8903_setup_gpios()
247 	data->uok = devm_gpiod_get_optional(dev, "uok", GPIOD_IN);  in max8903_setup_gpios()
248 	if (IS_ERR(data->uok))  in max8903_setup_gpios()
249 		return dev_err_probe(dev, PTR_ERR(data->uok),  in max8903_setup_gpios()
251 	if (data->uok) {  in max8903_setup_gpios()
252 		gpiod_set_consumer_name(data->uok, data->psy_desc.name);  in max8903_setup_gpios()
259 		usb_in = gpiod_get_value(data->uok);  in max8903_setup_gpios()
263 	if (!data->dok && !data->uok) {  in max8903_setup_gpios()
265 		return -EINVAL;  in max8903_setup_gpios()
281 	data->cen = devm_gpiod_get(dev, "cen", flags);  in max8903_setup_gpios()
282 	if (IS_ERR(data->cen))  in max8903_setup_gpios()
283 		return dev_err_probe(dev, PTR_ERR(data->cen),  in max8903_setup_gpios()
285 	gpiod_set_consumer_name(data->cen, data->psy_desc.name);  in max8903_setup_gpios()
295 	data->dcm = devm_gpiod_get_optional(dev, "dcm", flags);  in max8903_setup_gpios()
296 	if (IS_ERR(data->dcm))  in max8903_setup_gpios()
297 		return dev_err_probe(dev, PTR_ERR(data->dcm),  in max8903_setup_gpios()
299 	gpiod_set_consumer_name(data->dcm, data->psy_desc.name);  in max8903_setup_gpios()
301 	data->chg = devm_gpiod_get_optional(dev, "chg", GPIOD_IN);  in max8903_setup_gpios()
302 	if (IS_ERR(data->chg))  in max8903_setup_gpios()
303 		return dev_err_probe(dev, PTR_ERR(data->chg),  in max8903_setup_gpios()
304 				     "failed to get CHG GPIO");  in max8903_setup_gpios()
305 	gpiod_set_consumer_name(data->chg, data->psy_desc.name);  in max8903_setup_gpios()
307 	data->flt = devm_gpiod_get_optional(dev, "flt", GPIOD_IN);  in max8903_setup_gpios()
308 	if (IS_ERR(data->flt))  in max8903_setup_gpios()
309 		return dev_err_probe(dev, PTR_ERR(data->flt),  in max8903_setup_gpios()
311 	gpiod_set_consumer_name(data->flt, data->psy_desc.name);  in max8903_setup_gpios()
313 	data->usus = devm_gpiod_get_optional(dev, "usus", GPIOD_IN);  in max8903_setup_gpios()
314 	if (IS_ERR(data->usus))  in max8903_setup_gpios()
315 		return dev_err_probe(dev, PTR_ERR(data->usus),  in max8903_setup_gpios()
317 	gpiod_set_consumer_name(data->usus, data->psy_desc.name);  in max8903_setup_gpios()
319 	data->fault = false;  in max8903_setup_gpios()
320 	data->ta_in = ta_in;  in max8903_setup_gpios()
321 	data->usb_in = usb_in;  in max8903_setup_gpios()
329 	struct device *dev = &pdev->dev;  in max8903_probe()
335 		return -ENOMEM;  in max8903_probe()
337 	data->dev = dev;  in max8903_probe()
344 	data->psy_desc.name = "max8903_charger";  in max8903_probe()
345 	data->psy_desc.type = (data->ta_in) ? POWER_SUPPLY_TYPE_MAINS :  in max8903_probe()
346 			((data->usb_in) ? POWER_SUPPLY_TYPE_USB :  in max8903_probe()
348 	data->psy_desc.get_property = max8903_get_property;  in max8903_probe()
349 	data->psy_desc.properties = max8903_charger_props;  in max8903_probe()
350 	data->psy_desc.num_properties = ARRAY_SIZE(max8903_charger_props);  in max8903_probe()
352 	psy_cfg.of_node = dev->of_node;  in max8903_probe()
355 	data->psy = devm_power_supply_register(dev, &data->psy_desc, &psy_cfg);  in max8903_probe()
356 	if (IS_ERR(data->psy)) {  in max8903_probe()
358 		return PTR_ERR(data->psy);  in max8903_probe()
361 	if (data->dok) {  in max8903_probe()
362 		ret = devm_request_threaded_irq(dev, gpiod_to_irq(data->dok),  in max8903_probe()
369 					gpiod_to_irq(data->dok), ret);  in max8903_probe()
374 	if (data->uok) {  in max8903_probe()
375 		ret = devm_request_threaded_irq(dev, gpiod_to_irq(data->uok),  in max8903_probe()
382 					gpiod_to_irq(data->uok), ret);  in max8903_probe()
387 	if (data->flt) {  in max8903_probe()
388 		ret = devm_request_threaded_irq(dev, gpiod_to_irq(data->flt),  in max8903_probe()
395 					gpiod_to_irq(data->flt), ret);  in max8903_probe()
412 		.name	= "max8903-charger",
422 MODULE_ALIAS("platform:max8903-charger");