1 // SPDX-License-Identifier: GPL-2.0-only
3  * Battery charger driver for RT5033
9 #include <linux/devm-helpers.h>
18 #include <linux/mfd/rt5033-private.h>
43 static int rt5033_get_charger_state(struct rt5033_charger *charger)  in rt5033_get_charger_state()  argument
45 	struct regmap *regmap = charger->regmap;  in rt5033_get_charger_state()
72 	if (charger->otg)  in rt5033_get_charger_state()
78 static int rt5033_get_charger_type(struct rt5033_charger *charger)  in rt5033_get_charger_type()  argument
80 	struct regmap *regmap = charger->regmap;  in rt5033_get_charger_type()
100 static int rt5033_get_charger_current_limit(struct rt5033_charger *charger)  in rt5033_get_charger_current_limit()  argument
102 	struct regmap *regmap = charger->regmap;  in rt5033_get_charger_current_limit()
116 static int rt5033_get_charger_const_voltage(struct rt5033_charger *charger)  in rt5033_get_charger_const_voltage()  argument
118 	struct regmap *regmap = charger->regmap;  in rt5033_get_charger_const_voltage()
132 static inline int rt5033_init_const_charge(struct rt5033_charger *charger)  in rt5033_init_const_charge()  argument
134 	struct rt5033_charger_data *chg = &charger->chg;  in rt5033_init_const_charge()
140 	if (chg->const_uvolt < RT5033_CHARGER_CONST_VOLTAGE_LIMIT_MIN ||  in rt5033_init_const_charge()
141 	    chg->const_uvolt > RT5033_CHARGER_CONST_VOLTAGE_LIMIT_MAX) {  in rt5033_init_const_charge()
142 		dev_err(charger->dev,  in rt5033_init_const_charge()
143 			"Value 'constant-charge-voltage-max-microvolt' out of range\n");  in rt5033_init_const_charge()
144 		return -EINVAL;  in rt5033_init_const_charge()
147 	if (chg->const_uvolt == RT5033_CHARGER_CONST_VOLTAGE_LIMIT_MIN)  in rt5033_init_const_charge()
149 	else if (chg->const_uvolt == RT5033_CHARGER_CONST_VOLTAGE_LIMIT_MAX)  in rt5033_init_const_charge()
152 		val = chg->const_uvolt;  in rt5033_init_const_charge()
153 		val -= RT5033_CHARGER_CONST_VOLTAGE_LIMIT_MIN;  in rt5033_init_const_charge()
158 	ret = regmap_update_bits(charger->regmap, RT5033_REG_CHG_CTRL2,  in rt5033_init_const_charge()
162 		dev_err(charger->dev, "Failed regmap update\n");  in rt5033_init_const_charge()
163 		return -EINVAL;  in rt5033_init_const_charge()
167 	charger->cv_regval = reg_data;  in rt5033_init_const_charge()
170 	if (chg->eoc_uamp < RT5033_CHARGER_EOC_MIN ||  in rt5033_init_const_charge()
171 	    chg->eoc_uamp > RT5033_CHARGER_EOC_MAX) {  in rt5033_init_const_charge()
172 		dev_err(charger->dev,  in rt5033_init_const_charge()
173 			"Value 'charge-term-current-microamp' out of range\n");  in rt5033_init_const_charge()
174 		return -EINVAL;  in rt5033_init_const_charge()
177 	if (chg->eoc_uamp == RT5033_CHARGER_EOC_MIN)  in rt5033_init_const_charge()
179 	else if (chg->eoc_uamp == RT5033_CHARGER_EOC_MAX)  in rt5033_init_const_charge()
182 		val = chg->eoc_uamp;  in rt5033_init_const_charge()
184 			val -= RT5033_CHARGER_EOC_MIN;  in rt5033_init_const_charge()
188 			val -= RT5033_CHARGER_EOC_REF;  in rt5033_init_const_charge()
196 	ret = regmap_update_bits(charger->regmap, RT5033_REG_CHG_CTRL4,  in rt5033_init_const_charge()
199 		dev_err(charger->dev, "Failed regmap update\n");  in rt5033_init_const_charge()
200 		return -EINVAL;  in rt5033_init_const_charge()
206 static inline int rt5033_init_fast_charge(struct rt5033_charger *charger)  in rt5033_init_fast_charge()  argument
208 	struct rt5033_charger_data *chg = &charger->chg;  in rt5033_init_fast_charge()
214 	ret = regmap_update_bits(charger->regmap, RT5033_REG_CHG_CTRL1,  in rt5033_init_fast_charge()
217 		dev_err(charger->dev, "Failed regmap update\n");  in rt5033_init_fast_charge()
218 		return -EINVAL;  in rt5033_init_fast_charge()
221 	/* Set fast-charge mode charging current */  in rt5033_init_fast_charge()
222 	if (chg->fast_uamp < RT5033_CHARGER_FAST_CURRENT_MIN ||  in rt5033_init_fast_charge()
223 	    chg->fast_uamp > RT5033_CHARGER_FAST_CURRENT_MAX) {  in rt5033_init_fast_charge()
224 		dev_err(charger->dev,  in rt5033_init_fast_charge()
225 			"Value 'constant-charge-current-max-microamp' out of range\n");  in rt5033_init_fast_charge()
226 		return -EINVAL;  in rt5033_init_fast_charge()
229 	if (chg->fast_uamp == RT5033_CHARGER_FAST_CURRENT_MIN)  in rt5033_init_fast_charge()
231 	else if (chg->fast_uamp == RT5033_CHARGER_FAST_CURRENT_MAX)  in rt5033_init_fast_charge()
234 		val = chg->fast_uamp;  in rt5033_init_fast_charge()
235 		val -= RT5033_CHARGER_FAST_CURRENT_MIN;  in rt5033_init_fast_charge()
240 	ret = regmap_update_bits(charger->regmap, RT5033_REG_CHG_CTRL5,  in rt5033_init_fast_charge()
244 		dev_err(charger->dev, "Failed regmap update\n");  in rt5033_init_fast_charge()
245 		return -EINVAL;  in rt5033_init_fast_charge()
251 static inline int rt5033_init_pre_charge(struct rt5033_charger *charger)  in rt5033_init_pre_charge()  argument
253 	struct rt5033_charger_data *chg = &charger->chg;  in rt5033_init_pre_charge()
258 	/* Set pre-charge threshold voltage */  in rt5033_init_pre_charge()
259 	if (chg->pre_uvolt < RT5033_CHARGER_PRE_THRESHOLD_LIMIT_MIN ||  in rt5033_init_pre_charge()
260 	    chg->pre_uvolt > RT5033_CHARGER_PRE_THRESHOLD_LIMIT_MAX) {  in rt5033_init_pre_charge()
261 		dev_err(charger->dev,  in rt5033_init_pre_charge()
262 			"Value 'precharge-upper-limit-microvolt' out of range\n");  in rt5033_init_pre_charge()
263 		return -EINVAL;  in rt5033_init_pre_charge()
266 	if (chg->pre_uvolt == RT5033_CHARGER_PRE_THRESHOLD_LIMIT_MIN)  in rt5033_init_pre_charge()
268 	else if (chg->pre_uvolt == RT5033_CHARGER_PRE_THRESHOLD_LIMIT_MAX)  in rt5033_init_pre_charge()
271 		val = chg->pre_uvolt;  in rt5033_init_pre_charge()
272 		val -= RT5033_CHARGER_PRE_THRESHOLD_LIMIT_MIN;  in rt5033_init_pre_charge()
277 	ret = regmap_update_bits(charger->regmap, RT5033_REG_CHG_CTRL5,  in rt5033_init_pre_charge()
280 		dev_err(charger->dev, "Failed regmap update\n");  in rt5033_init_pre_charge()
281 		return -EINVAL;  in rt5033_init_pre_charge()
284 	/* Set pre-charge mode charging current */  in rt5033_init_pre_charge()
285 	if (chg->pre_uamp < RT5033_CHARGER_PRE_CURRENT_LIMIT_MIN ||  in rt5033_init_pre_charge()
286 	    chg->pre_uamp > RT5033_CHARGER_PRE_CURRENT_LIMIT_MAX) {  in rt5033_init_pre_charge()
287 		dev_err(charger->dev,  in rt5033_init_pre_charge()
288 			"Value 'precharge-current-microamp' out of range\n");  in rt5033_init_pre_charge()
289 		return -EINVAL;  in rt5033_init_pre_charge()
292 	if (chg->pre_uamp == RT5033_CHARGER_PRE_CURRENT_LIMIT_MIN)  in rt5033_init_pre_charge()
294 	else if (chg->pre_uamp == RT5033_CHARGER_PRE_CURRENT_LIMIT_MAX)  in rt5033_init_pre_charge()
297 		val = chg->pre_uamp;  in rt5033_init_pre_charge()
298 		val -= RT5033_CHARGER_PRE_CURRENT_LIMIT_MIN;  in rt5033_init_pre_charge()
303 	ret = regmap_update_bits(charger->regmap, RT5033_REG_CHG_CTRL4,  in rt5033_init_pre_charge()
307 		dev_err(charger->dev, "Failed regmap update\n");  in rt5033_init_pre_charge()
308 		return -EINVAL;  in rt5033_init_pre_charge()
314 static int rt5033_charger_reg_init(struct rt5033_charger *charger)  in rt5033_charger_reg_init()  argument
319 	ret = regmap_update_bits(charger->regmap, RT5033_REG_CHG_CTRL1,  in rt5033_charger_reg_init()
322 		dev_err(charger->dev, "Failed to enable charging termination.\n");  in rt5033_charger_reg_init()
323 		return -EINVAL;  in rt5033_charger_reg_init()
330 	ret = regmap_update_bits(charger->regmap, RT5033_REG_CHG_CTRL4,  in rt5033_charger_reg_init()
333 		dev_err(charger->dev, "Failed to disable MIVR.\n");  in rt5033_charger_reg_init()
334 		return -EINVAL;  in rt5033_charger_reg_init()
337 	ret = rt5033_init_pre_charge(charger);  in rt5033_charger_reg_init()
341 	ret = rt5033_init_fast_charge(charger);  in rt5033_charger_reg_init()
345 	ret = rt5033_init_const_charge(charger);  in rt5033_charger_reg_init()
352 static int rt5033_charger_set_otg(struct rt5033_charger *charger)  in rt5033_charger_set_otg()  argument
356 	mutex_lock(&charger->lock);  in rt5033_charger_set_otg()
359 	ret = regmap_update_bits(charger->regmap, RT5033_REG_CHG_CTRL2,  in rt5033_charger_set_otg()
363 		dev_err(charger->dev, "Failed set OTG boost v_out\n");  in rt5033_charger_set_otg()
364 		ret = -EINVAL;  in rt5033_charger_set_otg()
369 	ret = regmap_update_bits(charger->regmap, RT5033_REG_CHG_CTRL1,  in rt5033_charger_set_otg()
372 		dev_err(charger->dev, "Failed to update OTG mode.\n");  in rt5033_charger_set_otg()
373 		ret = -EINVAL;  in rt5033_charger_set_otg()
378 	if (charger->online)  in rt5033_charger_set_otg()
379 		charger->online = false;  in rt5033_charger_set_otg()
381 	charger->otg = true;  in rt5033_charger_set_otg()
384 	mutex_unlock(&charger->lock);  in rt5033_charger_set_otg()
389 static int rt5033_charger_unset_otg(struct rt5033_charger *charger)  in rt5033_charger_unset_otg()  argument
395 	data = charger->cv_regval;  in rt5033_charger_unset_otg()
396 	ret = regmap_update_bits(charger->regmap, RT5033_REG_CHG_CTRL2,  in rt5033_charger_unset_otg()
400 		dev_err(charger->dev, "Failed to restore constant voltage\n");  in rt5033_charger_unset_otg()
401 		return -EINVAL;  in rt5033_charger_unset_otg()
405 	ret = regmap_update_bits(charger->regmap, RT5033_REG_CHG_CTRL1,  in rt5033_charger_unset_otg()
408 		dev_err(charger->dev, "Failed to update charger mode.\n");  in rt5033_charger_unset_otg()
409 		return -EINVAL;  in rt5033_charger_unset_otg()
412 	charger->otg = false;  in rt5033_charger_unset_otg()
417 static int rt5033_charger_set_charging(struct rt5033_charger *charger)  in rt5033_charger_set_charging()  argument
421 	mutex_lock(&charger->lock);  in rt5033_charger_set_charging()
424 	if (charger->otg) {  in rt5033_charger_set_charging()
425 		ret = rt5033_charger_unset_otg(charger);  in rt5033_charger_set_charging()
427 			mutex_unlock(&charger->lock);  in rt5033_charger_set_charging()
428 			return -EINVAL;  in rt5033_charger_set_charging()
432 	charger->online = true;  in rt5033_charger_set_charging()
434 	mutex_unlock(&charger->lock);  in rt5033_charger_set_charging()
439 static int rt5033_charger_set_mivr(struct rt5033_charger *charger)  in rt5033_charger_set_mivr()  argument
443 	mutex_lock(&charger->lock);  in rt5033_charger_set_mivr()
446 	 * When connected via USB connector type SDP (Standard Downstream Port),  in rt5033_charger_set_mivr()
449 	 * by the adapter or USB input. As a downside, it may reduces the  in rt5033_charger_set_mivr()
452 	ret = regmap_update_bits(charger->regmap, RT5033_REG_CHG_CTRL4,  in rt5033_charger_set_mivr()
455 		dev_err(charger->dev, "Failed to set MIVR level.\n");  in rt5033_charger_set_mivr()
456 		mutex_unlock(&charger->lock);  in rt5033_charger_set_mivr()
457 		return -EINVAL;  in rt5033_charger_set_mivr()
460 	charger->mivr_enabled = true;  in rt5033_charger_set_mivr()
462 	mutex_unlock(&charger->lock);  in rt5033_charger_set_mivr()
465 	rt5033_charger_set_charging(charger);  in rt5033_charger_set_mivr()
470 static int rt5033_charger_set_disconnect(struct rt5033_charger *charger)  in rt5033_charger_set_disconnect()  argument
474 	mutex_lock(&charger->lock);  in rt5033_charger_set_disconnect()
477 	if (charger->mivr_enabled) {  in rt5033_charger_set_disconnect()
478 		ret = regmap_update_bits(charger->regmap,  in rt5033_charger_set_disconnect()
483 			dev_err(charger->dev, "Failed to disable MIVR.\n");  in rt5033_charger_set_disconnect()
484 			ret = -EINVAL;  in rt5033_charger_set_disconnect()
488 		charger->mivr_enabled = false;  in rt5033_charger_set_disconnect()
491 	if (charger->otg) {  in rt5033_charger_set_disconnect()
492 		ret = rt5033_charger_unset_otg(charger);  in rt5033_charger_set_disconnect()
494 			ret = -EINVAL;  in rt5033_charger_set_disconnect()
499 	if (charger->online)  in rt5033_charger_set_disconnect()
500 		charger->online = false;  in rt5033_charger_set_disconnect()
503 	mutex_unlock(&charger->lock);  in rt5033_charger_set_disconnect()
522 	struct rt5033_charger *charger = power_supply_get_drvdata(psy);  in rt5033_charger_get_property()  local
526 		val->intval = rt5033_get_charger_state(charger);  in rt5033_charger_get_property()
529 		val->intval = rt5033_get_charger_type(charger);  in rt5033_charger_get_property()
532 		val->intval = rt5033_get_charger_current_limit(charger);  in rt5033_charger_get_property()
535 		val->intval = rt5033_get_charger_const_voltage(charger);  in rt5033_charger_get_property()
538 		val->strval = RT5033_CHARGER_MODEL;  in rt5033_charger_get_property()
541 		val->strval = RT5033_MANUFACTURER;  in rt5033_charger_get_property()
544 		val->intval = charger->online;  in rt5033_charger_get_property()
547 		return -EINVAL;  in rt5033_charger_get_property()
553 static int rt5033_charger_dt_init(struct rt5033_charger *charger)  in rt5033_charger_dt_init()  argument
555 	struct rt5033_charger_data *chg = &charger->chg;  in rt5033_charger_dt_init()
559 	ret = power_supply_get_battery_info(charger->psy, &info);  in rt5033_charger_dt_init()
561 		return dev_err_probe(charger->dev, -EINVAL,  in rt5033_charger_dt_init()
565 	chg->pre_uamp = info->precharge_current_ua;  in rt5033_charger_dt_init()
566 	chg->fast_uamp = info->constant_charge_current_max_ua;  in rt5033_charger_dt_init()
567 	chg->eoc_uamp = info->charge_term_current_ua;  in rt5033_charger_dt_init()
568 	chg->pre_uvolt = info->precharge_voltage_max_uv;  in rt5033_charger_dt_init()
569 	chg->const_uvolt = info->constant_charge_voltage_max_uv;  in rt5033_charger_dt_init()
576 	struct rt5033_charger *charger =  in rt5033_charger_extcon_work()  local
578 	struct extcon_dev *edev = charger->edev;  in rt5033_charger_extcon_work()
599 		ret = rt5033_charger_set_mivr(charger);  in rt5033_charger_extcon_work()
601 			dev_err(charger->dev, "failed to set USB mode\n");  in rt5033_charger_extcon_work()
604 		dev_info(charger->dev, "USB mode. connector type: %d\n",  in rt5033_charger_extcon_work()
614 		ret = rt5033_charger_set_charging(charger);  in rt5033_charger_extcon_work()
616 			dev_err(charger->dev, "failed to set charging\n");  in rt5033_charger_extcon_work()
619 		dev_info(charger->dev, "charging. connector type: %d\n",  in rt5033_charger_extcon_work()
623 		ret = rt5033_charger_set_otg(charger);  in rt5033_charger_extcon_work()
625 			dev_err(charger->dev, "failed to set OTG\n");  in rt5033_charger_extcon_work()
628 		dev_info(charger->dev, "OTG enabled\n");  in rt5033_charger_extcon_work()
631 		ret = rt5033_charger_set_disconnect(charger);  in rt5033_charger_extcon_work()
633 			dev_err(charger->dev, "failed to set disconnect\n");  in rt5033_charger_extcon_work()
636 		dev_info(charger->dev, "disconnected\n");  in rt5033_charger_extcon_work()
640 	power_supply_changed(charger->psy);  in rt5033_charger_extcon_work()
646 	struct rt5033_charger *charger =  in rt5033_charger_extcon_notifier()  local
649 	schedule_work(&charger->extcon_work);  in rt5033_charger_extcon_notifier()
655 	.name = "rt5033-charger",
664 	struct rt5033_charger *charger;  in rt5033_charger_probe()  local
669 	charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL);  in rt5033_charger_probe()
670 	if (!charger)  in rt5033_charger_probe()
671 		return -ENOMEM;  in rt5033_charger_probe()
673 	platform_set_drvdata(pdev, charger);  in rt5033_charger_probe()
674 	charger->dev = &pdev->dev;  in rt5033_charger_probe()
675 	charger->regmap = dev_get_regmap(pdev->dev.parent, NULL);  in rt5033_charger_probe()
676 	mutex_init(&charger->lock);  in rt5033_charger_probe()
678 	psy_cfg.of_node = pdev->dev.of_node;  in rt5033_charger_probe()
679 	psy_cfg.drv_data = charger;  in rt5033_charger_probe()
681 	charger->psy = devm_power_supply_register(charger->dev,  in rt5033_charger_probe()
684 	if (IS_ERR(charger->psy))  in rt5033_charger_probe()
685 		return dev_err_probe(charger->dev, PTR_ERR(charger->psy),  in rt5033_charger_probe()
688 	ret = rt5033_charger_dt_init(charger);  in rt5033_charger_probe()
692 	ret = rt5033_charger_reg_init(charger);  in rt5033_charger_probe()
697 	 * Extcon support is not vital for the charger to work. If no extcon  in rt5033_charger_probe()
700 	np_conn = of_parse_phandle(pdev->dev.of_node, "richtek,usb-connector", 0);  in rt5033_charger_probe()
702 	charger->edev = extcon_find_edev_by_node(np_edev);  in rt5033_charger_probe()
703 	if (IS_ERR(charger->edev)) {  in rt5033_charger_probe()
704 		dev_warn(charger->dev, "no extcon device found in device-tree\n");  in rt5033_charger_probe()
708 	ret = devm_work_autocancel(charger->dev, &charger->extcon_work,  in rt5033_charger_probe()
711 		dev_err(charger->dev, "failed to initialize extcon work\n");  in rt5033_charger_probe()
715 	charger->extcon_nb.notifier_call = rt5033_charger_extcon_notifier;  in rt5033_charger_probe()
716 	ret = devm_extcon_register_notifier_all(charger->dev, charger->edev,  in rt5033_charger_probe()
717 						&charger->extcon_nb);  in rt5033_charger_probe()
719 		dev_err(charger->dev, "failed to register extcon notifier\n");  in rt5033_charger_probe()
727 	{ "rt5033-charger", },
733 	{ .compatible = "richtek,rt5033-charger", },
740 		.name = "rt5033-charger",
748 MODULE_DESCRIPTION("Richtek RT5033 charger driver");