1 // SPDX-License-Identifier: GPL-2.0-or-later
3  *  Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
18 #include <linux/power/gpio-charger.h>
58 	struct gpio_mapping mapping;  in set_charge_current_limit()  local
59 	int ndescs = gpio_charger->current_limit_gpios->ndescs;  in set_charge_current_limit()
60 	struct gpio_desc **gpios = gpio_charger->current_limit_gpios->desc;  in set_charge_current_limit()
63 	if (!gpio_charger->current_limit_map_size)  in set_charge_current_limit()
64 		return -EINVAL;  in set_charge_current_limit()
66 	for (i = 0; i < gpio_charger->current_limit_map_size; i++) {  in set_charge_current_limit()
67 		if (gpio_charger->current_limit_map[i].limit_ua <= val)  in set_charge_current_limit()
72 	 * If a valid charge current limit isn't found, default to smallest  in set_charge_current_limit()
73 	 * current limitation for safety reasons.  in set_charge_current_limit()
75 	if (i >= gpio_charger->current_limit_map_size)  in set_charge_current_limit()
76 		i = gpio_charger->current_limit_map_size - 1;  in set_charge_current_limit()
78 	mapping = gpio_charger->current_limit_map[i];  in set_charge_current_limit()
81 		bool val = (mapping.gpiodata >> i) & 1;  in set_charge_current_limit()
82 		gpiod_set_value_cansleep(gpios[ndescs-i-1], val);  in set_charge_current_limit()
85 	gpio_charger->charge_current_limit = mapping.limit_ua;  in set_charge_current_limit()
87 	dev_dbg(gpio_charger->dev, "set charge current limit to %d (requested: %d)\n",  in set_charge_current_limit()
88 		gpio_charger->charge_current_limit, val);  in set_charge_current_limit()
100 		val->intval = gpiod_get_value_cansleep(gpio_charger->gpiod);  in gpio_charger_get_property()
103 		if (gpiod_get_value_cansleep(gpio_charger->charge_status))  in gpio_charger_get_property()
104 			val->intval = POWER_SUPPLY_STATUS_CHARGING;  in gpio_charger_get_property()
106 			val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;  in gpio_charger_get_property()
109 		val->intval = gpio_charger->charge_current_limit;  in gpio_charger_get_property()
112 		return -EINVAL;  in gpio_charger_get_property()
125 		return set_charge_current_limit(gpio_charger, val->intval);  in gpio_charger_set_property()
127 		return -EINVAL;  in gpio_charger_set_property()
150 	if (!device_property_read_string(dev, "charger-type", &chargetype)) {  in gpio_charger_get_type()
159 		if (!strcmp("usb-sdp", chargetype))  in gpio_charger_get_type()
161 		if (!strcmp("usb-dcp", chargetype))  in gpio_charger_get_type()
163 		if (!strcmp("usb-cdp", chargetype))  in gpio_charger_get_type()
165 		if (!strcmp("usb-aca", chargetype))  in gpio_charger_get_type()
199 	gpio_charger->current_limit_gpios = devm_gpiod_get_array_optional(dev,  in init_charge_current_limit()
200 		"charge-current-limit", GPIOD_OUT_LOW);  in init_charge_current_limit()
201 	if (IS_ERR(gpio_charger->current_limit_gpios)) {  in init_charge_current_limit()
202 		dev_err(dev, "error getting current-limit GPIOs\n");  in init_charge_current_limit()
203 		return PTR_ERR(gpio_charger->current_limit_gpios);  in init_charge_current_limit()
206 	if (!gpio_charger->current_limit_gpios)  in init_charge_current_limit()
209 	len = device_property_read_u32_array(dev, "charge-current-limit-mapping",  in init_charge_current_limit()
215 		dev_err(dev, "invalid charge-current-limit-mapping length\n");  in init_charge_current_limit()
216 		return -EINVAL;  in init_charge_current_limit()
219 	gpio_charger->current_limit_map = devm_kmalloc_array(dev,  in init_charge_current_limit()
220 		len / 2, sizeof(*gpio_charger->current_limit_map), GFP_KERNEL);  in init_charge_current_limit()
221 	if (!gpio_charger->current_limit_map)  in init_charge_current_limit()
222 		return -ENOMEM;  in init_charge_current_limit()
224 	gpio_charger->current_limit_map_size = len / 2;  in init_charge_current_limit()
226 	len = device_property_read_u32_array(dev, "charge-current-limit-mapping",  in init_charge_current_limit()
227 		(u32*) gpio_charger->current_limit_map, len);  in init_charge_current_limit()
231 	for (i=0; i < gpio_charger->current_limit_map_size; i++) {  in init_charge_current_limit()
232 		if (gpio_charger->current_limit_map[i].limit_ua > cur_limit) {  in init_charge_current_limit()
233 			dev_err(dev, "charge-current-limit-mapping not sorted by current in descending order\n");  in init_charge_current_limit()
234 			return -EINVAL;  in init_charge_current_limit()
237 		cur_limit = gpio_charger->current_limit_map[i].limit_ua;  in init_charge_current_limit()
240 	/* default to smallest current limitation for safety reasons */  in init_charge_current_limit()
241 	len = gpio_charger->current_limit_map_size - 1;  in init_charge_current_limit()
243 		gpio_charger->current_limit_map[len].limit_ua);  in init_charge_current_limit()
261 	struct device *dev = &pdev->dev;  in gpio_charger_probe()
262 	const struct gpio_charger_platform_data *pdata = dev->platform_data;  in gpio_charger_probe()
271 	if (!pdata && !dev->of_node) {  in gpio_charger_probe()
273 		return -ENOENT;  in gpio_charger_probe()
278 		return -ENOMEM;  in gpio_charger_probe()
279 	gpio_charger->dev = dev;  in gpio_charger_probe()
285 	gpio_charger->gpiod = devm_gpiod_get_optional(dev, NULL, GPIOD_IN);  in gpio_charger_probe()
286 	if (IS_ERR(gpio_charger->gpiod)) {  in gpio_charger_probe()
288 		return dev_err_probe(dev, PTR_ERR(gpio_charger->gpiod),  in gpio_charger_probe()
292 	if (gpio_charger->gpiod) {  in gpio_charger_probe()
297 	charge_status = devm_gpiod_get_optional(dev, "charge-status", GPIOD_IN);  in gpio_charger_probe()
301 		gpio_charger->charge_status = charge_status;  in gpio_charger_probe()
309 	if (gpio_charger->current_limit_map) {  in gpio_charger_probe()
315 	charger_desc = &gpio_charger->charger_desc;  in gpio_charger_probe()
316 	charger_desc->properties = gpio_charger_properties;  in gpio_charger_probe()
317 	charger_desc->num_properties = num_props;  in gpio_charger_probe()
318 	charger_desc->get_property = gpio_charger_get_property;  in gpio_charger_probe()
319 	charger_desc->set_property = gpio_charger_set_property;  in gpio_charger_probe()
320 	charger_desc->property_is_writeable =  in gpio_charger_probe()
323 	psy_cfg.of_node = dev->of_node;  in gpio_charger_probe()
327 		charger_desc->name = pdata->name;  in gpio_charger_probe()
328 		charger_desc->type = pdata->type;  in gpio_charger_probe()
329 		psy_cfg.supplied_to = pdata->supplied_to;  in gpio_charger_probe()
330 		psy_cfg.num_supplicants = pdata->num_supplicants;  in gpio_charger_probe()
332 		charger_desc->name = dev->of_node->name;  in gpio_charger_probe()
333 		charger_desc->type = gpio_charger_get_type(dev);  in gpio_charger_probe()
336 	if (!charger_desc->name)  in gpio_charger_probe()
337 		charger_desc->name = pdev->name;  in gpio_charger_probe()
339 	gpio_charger->charger = devm_power_supply_register(dev, charger_desc,  in gpio_charger_probe()
341 	if (IS_ERR(gpio_charger->charger)) {  in gpio_charger_probe()
342 		ret = PTR_ERR(gpio_charger->charger);  in gpio_charger_probe()
347 	gpio_charger->irq = gpio_charger_get_irq(dev, gpio_charger->charger,  in gpio_charger_probe()
348 						 gpio_charger->gpiod);  in gpio_charger_probe()
350 	charge_status_irq = gpio_charger_get_irq(dev, gpio_charger->charger,  in gpio_charger_probe()
351 						 gpio_charger->charge_status);  in gpio_charger_probe()
352 	gpio_charger->charge_status_irq = charge_status_irq;  in gpio_charger_probe()
367 		gpio_charger->wakeup_enabled =  in gpio_charger_suspend()
368 			!enable_irq_wake(gpio_charger->irq);  in gpio_charger_suspend()
377 	if (device_may_wakeup(dev) && gpio_charger->wakeup_enabled)  in gpio_charger_resume()
378 		disable_irq_wake(gpio_charger->irq);  in gpio_charger_resume()
379 	power_supply_changed(gpio_charger->charger);  in gpio_charger_resume()
389 	{ .compatible = "gpio-charger" },
397 		.name = "gpio-charger",
405 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
408 MODULE_ALIAS("platform:gpio-charger");