Lines Matching +full:gpio +full:- +full:charger
1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * max8903_charger.c - Maxim 8903 USB/Adapter Charger Driver
9 #include <linux/gpio/consumer.h>
27 struct gpio_desc *cen; /* Charger Enable input */
30 struct gpio_desc *chg; /* Charger status output */
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;
54 if (data->chg) {
55 if (gpiod_get_value(data->chg))
57 val->intval = POWER_SUPPLY_STATUS_CHARGING;
58 else if (data->usb_in || data->ta_in)
59 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
61 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
65 val->intval = 0;
66 if (data->usb_in || data->ta_in)
67 val->intval = 1;
70 val->intval = POWER_SUPPLY_HEALTH_GOOD;
71 if (data->fault)
72 val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
75 return -EINVAL;
90 * The signal is active low, but the inversion is handled in the GPIO
94 ta_in = gpiod_get_value(data->dok);
96 if (ta_in == data->ta_in)
99 data->ta_in = ta_in;
101 /* Set Current-Limit-Mode 1:DC 0:USB */
102 if (data->dcm)
103 gpiod_set_value(data->dcm, ta_in);
105 /* Charger Enable / Disable */
106 if (data->cen) {
112 else if (data->usb_in)
113 /* Enable if the USB charger is enabled */
116 /* Else default-disable */
119 gpiod_set_value(data->cen, val);
122 dev_dbg(data->dev, "TA(DC-IN) Charger %s.\n", ta_in ?
125 old_type = data->psy_desc.type;
127 if (data->ta_in)
128 data->psy_desc.type = POWER_SUPPLY_TYPE_MAINS;
129 else if (data->usb_in)
130 data->psy_desc.type = POWER_SUPPLY_TYPE_USB;
132 data->psy_desc.type = POWER_SUPPLY_TYPE_BATTERY;
134 if (old_type != data->psy_desc.type)
135 power_supply_changed(data->psy);
149 * The signal is active low, but the inversion is handled in the GPIO
153 usb_in = gpiod_get_value(data->uok);
155 if (usb_in == data->usb_in)
158 data->usb_in = usb_in;
160 /* Do not touch Current-Limit-Mode */
162 /* Charger Enable / Disable */
163 if (data->cen) {
169 else if (data->ta_in)
170 /* Enable if the DC charger is enabled */
173 /* Else default-disable */
176 gpiod_set_value(data->cen, val);
179 dev_dbg(data->dev, "USB Charger %s.\n", usb_in ?
182 old_type = data->psy_desc.type;
184 if (data->ta_in)
185 data->psy_desc.type = POWER_SUPPLY_TYPE_MAINS;
186 else if (data->usb_in)
187 data->psy_desc.type = POWER_SUPPLY_TYPE_USB;
189 data->psy_desc.type = POWER_SUPPLY_TYPE_BATTERY;
191 if (old_type != data->psy_desc.type)
192 power_supply_changed(data->psy);
205 * The signal is active low, but the inversion is handled in the GPIO
209 fault = gpiod_get_value(data->flt);
211 if (fault == data->fault)
214 data->fault = fault;
217 dev_err(data->dev, "Charger suffers a fault and stops.\n");
219 dev_err(data->dev, "Charger recovered from a fault.\n");
227 struct device *dev = &pdev->dev;
232 data->dok = devm_gpiod_get_optional(dev, "dok", GPIOD_IN);
233 if (IS_ERR(data->dok))
234 return dev_err_probe(dev, PTR_ERR(data->dok),
235 "failed to get DOK GPIO");
236 if (data->dok) {
237 gpiod_set_consumer_name(data->dok, data->psy_desc.name);
239 * The DC OK is pulled up to 1 and goes low when a charger
242 * here if the DC charger is plugged in.
244 ta_in = gpiod_get_value(data->dok);
247 data->uok = devm_gpiod_get_optional(dev, "uok", GPIOD_IN);
248 if (IS_ERR(data->uok))
249 return dev_err_probe(dev, PTR_ERR(data->uok),
250 "failed to get UOK GPIO");
251 if (data->uok) {
252 gpiod_set_consumer_name(data->uok, data->psy_desc.name);
254 * The USB OK is pulled up to 1 and goes low when a USB charger
257 * here if the USB charger is plugged in.
259 usb_in = gpiod_get_value(data->uok);
263 if (!data->dok && !data->uok) {
265 return -EINVAL;
269 * If either charger is already connected at this point,
278 * If DC OK is provided, Charger Enable CEN is compulsory
281 data->cen = devm_gpiod_get(dev, "cen", flags);
282 if (IS_ERR(data->cen))
283 return dev_err_probe(dev, PTR_ERR(data->cen),
284 "failed to get CEN GPIO");
285 gpiod_set_consumer_name(data->cen, data->psy_desc.name);
288 * If the DC charger is connected, then select it.
291 * device tree. Driving it high will enable the DC charger
292 * input over the USB charger input.
295 data->dcm = devm_gpiod_get_optional(dev, "dcm", flags);
296 if (IS_ERR(data->dcm))
297 return dev_err_probe(dev, PTR_ERR(data->dcm),
298 "failed to get DCM GPIO");
299 gpiod_set_consumer_name(data->dcm, data->psy_desc.name);
301 data->chg = devm_gpiod_get_optional(dev, "chg", GPIOD_IN);
302 if (IS_ERR(data->chg))
303 return dev_err_probe(dev, PTR_ERR(data->chg),
304 "failed to get CHG GPIO");
305 gpiod_set_consumer_name(data->chg, data->psy_desc.name);
307 data->flt = devm_gpiod_get_optional(dev, "flt", GPIOD_IN);
308 if (IS_ERR(data->flt))
309 return dev_err_probe(dev, PTR_ERR(data->flt),
310 "failed to get FLT GPIO");
311 gpiod_set_consumer_name(data->flt, data->psy_desc.name);
313 data->usus = devm_gpiod_get_optional(dev, "usus", GPIOD_IN);
314 if (IS_ERR(data->usus))
315 return dev_err_probe(dev, PTR_ERR(data->usus),
316 "failed to get USUS GPIO");
317 gpiod_set_consumer_name(data->usus, data->psy_desc.name);
319 data->fault = false;
320 data->ta_in = ta_in;
321 data->usb_in = usb_in;
329 struct device *dev = &pdev->dev;
335 return -ENOMEM;
337 data->dev = dev;
344 data->psy_desc.name = "max8903_charger";
345 data->psy_desc.type = (data->ta_in) ? POWER_SUPPLY_TYPE_MAINS :
346 ((data->usb_in) ? POWER_SUPPLY_TYPE_USB :
348 data->psy_desc.get_property = max8903_get_property;
349 data->psy_desc.properties = max8903_charger_props;
350 data->psy_desc.num_properties = ARRAY_SIZE(max8903_charger_props);
355 data->psy = devm_power_supply_register(dev, &data->psy_desc, &psy_cfg);
356 if (IS_ERR(data->psy)) {
358 return PTR_ERR(data->psy);
361 if (data->dok) {
362 ret = devm_request_threaded_irq(dev, gpiod_to_irq(data->dok),
369 gpiod_to_irq(data->dok), ret);
374 if (data->uok) {
375 ret = devm_request_threaded_irq(dev, gpiod_to_irq(data->uok),
382 gpiod_to_irq(data->uok), ret);
387 if (data->flt) {
388 ret = devm_request_threaded_irq(dev, gpiod_to_irq(data->flt),
395 gpiod_to_irq(data->flt), ret);
412 .name = "max8903-charger",
420 MODULE_DESCRIPTION("MAX8903 Charger Driver");
422 MODULE_ALIAS("platform:max8903-charger");