1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * max8903_charger.c - Maxim 8903 USB/Adapter Charger Driver
9 #include <linux/gpio.h>
31 	POWER_SUPPLY_PROP_STATUS, /* Charger status output */
44 		val->intval = POWER_SUPPLY_STATUS_UNKNOWN;  in max8903_get_property()
45 		if (gpio_is_valid(data->pdata->chg)) {  in max8903_get_property()
46 			if (gpio_get_value(data->pdata->chg) == 0)  in max8903_get_property()
47 				val->intval = POWER_SUPPLY_STATUS_CHARGING;  in max8903_get_property()
48 			else if (data->usb_in || data->ta_in)  in max8903_get_property()
49 				val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;  in max8903_get_property()
51 				val->intval = POWER_SUPPLY_STATUS_DISCHARGING;  in max8903_get_property()
55 		val->intval = 0;  in max8903_get_property()
56 		if (data->usb_in || data->ta_in)  in max8903_get_property()
57 			val->intval = 1;  in max8903_get_property()
60 		val->intval = POWER_SUPPLY_HEALTH_GOOD;  in max8903_get_property()
61 		if (data->fault)  in max8903_get_property()
62 			val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;  in max8903_get_property()
65 		return -EINVAL;  in max8903_get_property()
74 	struct max8903_pdata *pdata = data->pdata;  in max8903_dcin()
78 	ta_in = gpio_get_value(pdata->dok) ? false : true;  in max8903_dcin()
80 	if (ta_in == data->ta_in)  in max8903_dcin()
83 	data->ta_in = ta_in;  in max8903_dcin()
85 	/* Set Current-Limit-Mode 1:DC 0:USB */  in max8903_dcin()
86 	if (gpio_is_valid(pdata->dcm))  in max8903_dcin()
87 		gpio_set_value(pdata->dcm, ta_in ? 1 : 0);  in max8903_dcin()
89 	/* Charger Enable / Disable (cen is negated) */  in max8903_dcin()
90 	if (gpio_is_valid(pdata->cen))  in max8903_dcin()
91 		gpio_set_value(pdata->cen, ta_in ? 0 :  in max8903_dcin()
92 				(data->usb_in ? 0 : 1));  in max8903_dcin()
94 	dev_dbg(data->dev, "TA(DC-IN) Charger %s.\n", ta_in ?  in max8903_dcin()
97 	old_type = data->psy_desc.type;  in max8903_dcin()
99 	if (data->ta_in)  in max8903_dcin()
100 		data->psy_desc.type = POWER_SUPPLY_TYPE_MAINS;  in max8903_dcin()
101 	else if (data->usb_in)  in max8903_dcin()
102 		data->psy_desc.type = POWER_SUPPLY_TYPE_USB;  in max8903_dcin()
104 		data->psy_desc.type = POWER_SUPPLY_TYPE_BATTERY;  in max8903_dcin()
106 	if (old_type != data->psy_desc.type)  in max8903_dcin()
107 		power_supply_changed(data->psy);  in max8903_dcin()
115 	struct max8903_pdata *pdata = data->pdata;  in max8903_usbin()
119 	usb_in = gpio_get_value(pdata->uok) ? false : true;  in max8903_usbin()
121 	if (usb_in == data->usb_in)  in max8903_usbin()
124 	data->usb_in = usb_in;  in max8903_usbin()
126 	/* Do not touch Current-Limit-Mode */  in max8903_usbin()
128 	/* Charger Enable / Disable (cen is negated) */  in max8903_usbin()
129 	if (gpio_is_valid(pdata->cen))  in max8903_usbin()
130 		gpio_set_value(pdata->cen, usb_in ? 0 :  in max8903_usbin()
131 				(data->ta_in ? 0 : 1));  in max8903_usbin()
133 	dev_dbg(data->dev, "USB Charger %s.\n", usb_in ?  in max8903_usbin()
136 	old_type = data->psy_desc.type;  in max8903_usbin()
138 	if (data->ta_in)  in max8903_usbin()
139 		data->psy_desc.type = POWER_SUPPLY_TYPE_MAINS;  in max8903_usbin()
140 	else if (data->usb_in)  in max8903_usbin()
141 		data->psy_desc.type = POWER_SUPPLY_TYPE_USB;  in max8903_usbin()
143 		data->psy_desc.type = POWER_SUPPLY_TYPE_BATTERY;  in max8903_usbin()
145 	if (old_type != data->psy_desc.type)  in max8903_usbin()
146 		power_supply_changed(data->psy);  in max8903_usbin()
154 	struct max8903_pdata *pdata = data->pdata;  in max8903_fault()
157 	fault = gpio_get_value(pdata->flt) ? false : true;  in max8903_fault()
159 	if (fault == data->fault)  in max8903_fault()
162 	data->fault = fault;  in max8903_fault()
165 		dev_err(data->dev, "Charger suffers a fault and stops.\n");  in max8903_fault()
167 		dev_err(data->dev, "Charger recovered from a fault.\n");  in max8903_fault()
174 	struct device_node *np = dev->of_node;  in max8903_parse_dt_data()
184 	pdata->dc_valid = false;  in max8903_parse_dt_data()
185 	pdata->usb_valid = false;  in max8903_parse_dt_data()
187 	pdata->cen = of_get_named_gpio(np, "cen-gpios", 0);  in max8903_parse_dt_data()
188 	if (!gpio_is_valid(pdata->cen))  in max8903_parse_dt_data()
189 		pdata->cen = -EINVAL;  in max8903_parse_dt_data()
191 	pdata->chg = of_get_named_gpio(np, "chg-gpios", 0);  in max8903_parse_dt_data()
192 	if (!gpio_is_valid(pdata->chg))  in max8903_parse_dt_data()
193 		pdata->chg = -EINVAL;  in max8903_parse_dt_data()
195 	pdata->flt = of_get_named_gpio(np, "flt-gpios", 0);  in max8903_parse_dt_data()
196 	if (!gpio_is_valid(pdata->flt))  in max8903_parse_dt_data()
197 		pdata->flt = -EINVAL;  in max8903_parse_dt_data()
199 	pdata->usus = of_get_named_gpio(np, "usus-gpios", 0);  in max8903_parse_dt_data()
200 	if (!gpio_is_valid(pdata->usus))  in max8903_parse_dt_data()
201 		pdata->usus = -EINVAL;  in max8903_parse_dt_data()
203 	pdata->dcm = of_get_named_gpio(np, "dcm-gpios", 0);  in max8903_parse_dt_data()
204 	if (!gpio_is_valid(pdata->dcm))  in max8903_parse_dt_data()
205 		pdata->dcm = -EINVAL;  in max8903_parse_dt_data()
207 	pdata->dok = of_get_named_gpio(np, "dok-gpios", 0);  in max8903_parse_dt_data()
208 	if (!gpio_is_valid(pdata->dok))  in max8903_parse_dt_data()
209 		pdata->dok = -EINVAL;  in max8903_parse_dt_data()
211 		pdata->dc_valid = true;  in max8903_parse_dt_data()
213 	pdata->uok = of_get_named_gpio(np, "uok-gpios", 0);  in max8903_parse_dt_data()
214 	if (!gpio_is_valid(pdata->uok))  in max8903_parse_dt_data()
215 		pdata->uok = -EINVAL;  in max8903_parse_dt_data()
217 		pdata->usb_valid = true;  in max8903_parse_dt_data()
225 	struct device *dev = &pdev->dev;  in max8903_setup_gpios()
226 	struct max8903_pdata *pdata = pdev->dev.platform_data;  in max8903_setup_gpios()
228 	int gpio;  in max8903_setup_gpios()  local
232 	if (pdata->dc_valid) {  in max8903_setup_gpios()
233 		if (gpio_is_valid(pdata->dok)) {  in max8903_setup_gpios()
234 			ret = devm_gpio_request(dev, pdata->dok,  in max8903_setup_gpios()
235 						data->psy_desc.name);  in max8903_setup_gpios()
238 					"Failed GPIO request for dok: %d err %d\n",  in max8903_setup_gpios()
239 					pdata->dok, ret);  in max8903_setup_gpios()
243 			gpio = pdata->dok; /* PULL_UPed Interrupt */  in max8903_setup_gpios()
244 			ta_in = gpio_get_value(gpio) ? 0 : 1;  in max8903_setup_gpios()
247 			return -EINVAL;  in max8903_setup_gpios()
251 	if (gpio_is_valid(pdata->dcm)) {  in max8903_setup_gpios()
252 		ret = devm_gpio_request(dev, pdata->dcm, data->psy_desc.name);  in max8903_setup_gpios()
255 				"Failed GPIO request for dcm: %d err %d\n",  in max8903_setup_gpios()
256 				pdata->dcm, ret);  in max8903_setup_gpios()
260 		gpio = pdata->dcm; /* Output */  in max8903_setup_gpios()
261 		gpio_set_value(gpio, ta_in);  in max8903_setup_gpios()
264 	if (pdata->usb_valid) {  in max8903_setup_gpios()
265 		if (gpio_is_valid(pdata->uok)) {  in max8903_setup_gpios()
266 			ret = devm_gpio_request(dev, pdata->uok,  in max8903_setup_gpios()
267 						data->psy_desc.name);  in max8903_setup_gpios()
270 					"Failed GPIO request for uok: %d err %d\n",  in max8903_setup_gpios()
271 					pdata->uok, ret);  in max8903_setup_gpios()
275 			gpio = pdata->uok;  in max8903_setup_gpios()
276 			usb_in = gpio_get_value(gpio) ? 0 : 1;  in max8903_setup_gpios()
280 			return -EINVAL;  in max8903_setup_gpios()
284 	if (gpio_is_valid(pdata->cen)) {  in max8903_setup_gpios()
285 		ret = devm_gpio_request(dev, pdata->cen, data->psy_desc.name);  in max8903_setup_gpios()
288 				"Failed GPIO request for cen: %d err %d\n",  in max8903_setup_gpios()
289 				pdata->cen, ret);  in max8903_setup_gpios()
293 		gpio_set_value(pdata->cen, (ta_in || usb_in) ? 0 : 1);  in max8903_setup_gpios()
296 	if (gpio_is_valid(pdata->chg)) {  in max8903_setup_gpios()
297 		ret = devm_gpio_request(dev, pdata->chg, data->psy_desc.name);  in max8903_setup_gpios()
300 				"Failed GPIO request for chg: %d err %d\n",  in max8903_setup_gpios()
301 				pdata->chg, ret);  in max8903_setup_gpios()
306 	if (gpio_is_valid(pdata->flt)) {  in max8903_setup_gpios()
307 		ret = devm_gpio_request(dev, pdata->flt, data->psy_desc.name);  in max8903_setup_gpios()
310 				"Failed GPIO request for flt: %d err %d\n",  in max8903_setup_gpios()
311 				pdata->flt, ret);  in max8903_setup_gpios()
316 	if (gpio_is_valid(pdata->usus)) {  in max8903_setup_gpios()
317 		ret = devm_gpio_request(dev, pdata->usus, data->psy_desc.name);  in max8903_setup_gpios()
320 				"Failed GPIO request for usus: %d err %d\n",  in max8903_setup_gpios()
321 				pdata->usus, ret);  in max8903_setup_gpios()
326 	data->fault = false;  in max8903_setup_gpios()
327 	data->ta_in = ta_in;  in max8903_setup_gpios()
328 	data->usb_in = usb_in;  in max8903_setup_gpios()
336 	struct device *dev = &pdev->dev;  in max8903_probe()
337 	struct max8903_pdata *pdata = pdev->dev.platform_data;  in max8903_probe()
343 		return -ENOMEM;  in max8903_probe()
345 	if (IS_ENABLED(CONFIG_OF) && !pdata && dev->of_node)  in max8903_probe()
350 		return -EINVAL;  in max8903_probe()
353 	pdev->dev.platform_data = pdata;  in max8903_probe()
354 	data->pdata = pdata;  in max8903_probe()
355 	data->dev = dev;  in max8903_probe()
358 	if (pdata->dc_valid == false && pdata->usb_valid == false) {  in max8903_probe()
360 		return -EINVAL;  in max8903_probe()
367 	data->psy_desc.name = "max8903_charger";  in max8903_probe()
368 	data->psy_desc.type = (data->ta_in) ? POWER_SUPPLY_TYPE_MAINS :  in max8903_probe()
369 			((data->usb_in) ? POWER_SUPPLY_TYPE_USB :  in max8903_probe()
371 	data->psy_desc.get_property = max8903_get_property;  in max8903_probe()
372 	data->psy_desc.properties = max8903_charger_props;  in max8903_probe()
373 	data->psy_desc.num_properties = ARRAY_SIZE(max8903_charger_props);  in max8903_probe()
375 	psy_cfg.of_node = dev->of_node;  in max8903_probe()
378 	data->psy = devm_power_supply_register(dev, &data->psy_desc, &psy_cfg);  in max8903_probe()
379 	if (IS_ERR(data->psy)) {  in max8903_probe()
381 		return PTR_ERR(data->psy);  in max8903_probe()
384 	if (pdata->dc_valid) {  in max8903_probe()
385 		ret = devm_request_threaded_irq(dev, gpio_to_irq(pdata->dok),  in max8903_probe()
392 					gpio_to_irq(pdata->dok), ret);  in max8903_probe()
397 	if (pdata->usb_valid) {  in max8903_probe()
398 		ret = devm_request_threaded_irq(dev, gpio_to_irq(pdata->uok),  in max8903_probe()
405 					gpio_to_irq(pdata->uok), ret);  in max8903_probe()
410 	if (gpio_is_valid(pdata->flt)) {  in max8903_probe()
411 		ret = devm_request_threaded_irq(dev, gpio_to_irq(pdata->flt),  in max8903_probe()
418 					gpio_to_irq(pdata->flt), ret);  in max8903_probe()
435 		.name	= "max8903-charger",
443 MODULE_DESCRIPTION("MAX8903 Charger Driver");
445 MODULE_ALIAS("platform:max8903-charger");