Lines Matching +full:gpio +full:- +full:charger
1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
4 * Driver for chargers which report their online status through a GPIO pin
16 #include <linux/gpio/consumer.h>
18 #include <linux/power/gpio-charger.h>
31 struct power_supply *charger;
44 struct power_supply *charger = devid;
46 power_supply_changed(charger);
59 int ndescs = gpio_charger->current_limit_gpios->ndescs;
60 struct gpio_desc **gpios = gpio_charger->current_limit_gpios->desc;
63 if (!gpio_charger->current_limit_map_size)
64 return -EINVAL;
66 for (i = 0; i < gpio_charger->current_limit_map_size; i++) {
67 if (gpio_charger->current_limit_map[i].limit_ua <= val)
75 if (i >= gpio_charger->current_limit_map_size)
76 i = gpio_charger->current_limit_map_size - 1;
78 mapping = gpio_charger->current_limit_map[i];
82 gpiod_set_value_cansleep(gpios[ndescs-i-1], val);
85 gpio_charger->charge_current_limit = mapping.limit_ua;
87 dev_dbg(gpio_charger->dev, "set charge current limit to %d (requested: %d)\n",
88 gpio_charger->charge_current_limit, val);
100 val->intval = gpiod_get_value_cansleep(gpio_charger->gpiod);
103 if (gpiod_get_value_cansleep(gpio_charger->charge_status))
104 val->intval = POWER_SUPPLY_STATUS_CHARGING;
106 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
109 val->intval = gpio_charger->charge_current_limit;
112 return -EINVAL;
125 return set_charge_current_limit(gpio_charger, val->intval);
127 return -EINVAL;
150 if (!device_property_read_string(dev, "charger-type", &chargetype)) {
159 if (!strcmp("usb-sdp", chargetype))
161 if (!strcmp("usb-dcp", chargetype))
163 if (!strcmp("usb-cdp", chargetype))
165 if (!strcmp("usb-aca", chargetype))
168 dev_warn(dev, "unknown charger type %s\n", chargetype);
174 struct gpio_desc *gpio)
176 int ret, irq = gpiod_to_irq(gpio);
201 gpio_charger->current_limit_gpios = devm_gpiod_get_array_optional(dev,
202 "charge-current-limit", GPIOD_OUT_LOW);
203 if (IS_ERR(gpio_charger->current_limit_gpios)) {
204 dev_err(dev, "error getting current-limit GPIOs\n");
205 return PTR_ERR(gpio_charger->current_limit_gpios);
208 if (!gpio_charger->current_limit_gpios)
211 len = device_property_read_u32_array(dev, "charge-current-limit-mapping",
217 dev_err(dev, "invalid charge-current-limit-mapping length\n");
218 return -EINVAL;
221 gpio_charger->current_limit_map = devm_kmalloc_array(dev,
222 len / 2, sizeof(*gpio_charger->current_limit_map), GFP_KERNEL);
223 if (!gpio_charger->current_limit_map)
224 return -ENOMEM;
226 gpio_charger->current_limit_map_size = len / 2;
228 len = device_property_read_u32_array(dev, "charge-current-limit-mapping",
229 (u32*) gpio_charger->current_limit_map, len);
234 "charge-current-limit-default-microamp",
236 for (i=0; i < gpio_charger->current_limit_map_size; i++) {
237 if (gpio_charger->current_limit_map[i].limit_ua > cur_limit) {
238 dev_err(dev, "charge-current-limit-mapping not sorted by current in descending order\n");
239 return -EINVAL;
242 cur_limit = gpio_charger->current_limit_map[i].limit_ua;
250 dev_warn(dev, "charge-current-limit-default-microamp %u not listed in charge-current-limit-mapping\n",
254 len = gpio_charger->current_limit_map_size - 1;
256 gpio_charger->current_limit_map[len].limit_ua);
274 struct device *dev = &pdev->dev;
275 const struct gpio_charger_platform_data *pdata = dev->platform_data;
284 if (!pdata && !dev->of_node) {
286 return -ENOENT;
291 return -ENOMEM;
292 gpio_charger->dev = dev;
295 * This will fetch a GPIO descriptor from device tree, ACPI or
298 gpio_charger->gpiod = devm_gpiod_get_optional(dev, NULL, GPIOD_IN);
299 if (IS_ERR(gpio_charger->gpiod)) {
301 return dev_err_probe(dev, PTR_ERR(gpio_charger->gpiod),
302 "error getting GPIO descriptor\n");
305 if (gpio_charger->gpiod) {
310 charge_status = devm_gpiod_get_optional(dev, "charge-status", GPIOD_IN);
314 gpio_charger->charge_status = charge_status;
322 if (gpio_charger->current_limit_map) {
328 charger_desc = &gpio_charger->charger_desc;
329 charger_desc->properties = gpio_charger_properties;
330 charger_desc->num_properties = num_props;
331 charger_desc->get_property = gpio_charger_get_property;
332 charger_desc->set_property = gpio_charger_set_property;
333 charger_desc->property_is_writeable =
340 charger_desc->name = pdata->name;
341 charger_desc->type = pdata->type;
342 psy_cfg.supplied_to = pdata->supplied_to;
343 psy_cfg.num_supplicants = pdata->num_supplicants;
345 charger_desc->name = dev->of_node->name;
346 charger_desc->type = gpio_charger_get_type(dev);
349 if (!charger_desc->name)
350 charger_desc->name = pdev->name;
352 gpio_charger->charger = devm_power_supply_register(dev, charger_desc,
354 if (IS_ERR(gpio_charger->charger)) {
355 ret = PTR_ERR(gpio_charger->charger);
360 gpio_charger->irq = gpio_charger_get_irq(dev, gpio_charger->charger,
361 gpio_charger->gpiod);
363 charge_status_irq = gpio_charger_get_irq(dev, gpio_charger->charger,
364 gpio_charger->charge_status);
365 gpio_charger->charge_status_irq = charge_status_irq;
380 gpio_charger->wakeup_enabled =
381 !enable_irq_wake(gpio_charger->irq);
390 if (device_may_wakeup(dev) && gpio_charger->wakeup_enabled)
391 disable_irq_wake(gpio_charger->irq);
392 power_supply_changed(gpio_charger->charger);
402 { .compatible = "gpio-charger" },
410 .name = "gpio-charger",
418 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
419 MODULE_DESCRIPTION("Driver for chargers only communicating via GPIO(s)");
421 MODULE_ALIAS("platform:gpio-charger");