1 // SPDX-License-Identifier: GPL-2.0+
3 // max14577_charger.c - Battery charger driver for the Maxim 14577/77836
11 #include <linux/mfd/max14577-private.h>
47 static int max14577_get_charger_state(struct max14577_charger *chg, int *val)  in max14577_get_charger_state()  argument
49 	struct regmap *rmap = chg->max14577->regmap;  in max14577_get_charger_state()
50 	int ret;  in max14577_get_charger_state()
55 	 *  - CHGCTRL2/MBCHOSTEN == 1  in max14577_get_charger_state()
56 	 *  - STATUS2/CGMBC == 1  in max14577_get_charger_state()
59 	 *  - handle FULL after Top-off timer (EOC register may be off  in max14577_get_charger_state()
61 	 *  - handle properly dead-battery charging (respect timer)  in max14577_get_charger_state()
62 	 *  - handle timers (fast-charge and prequal) /MBCCHGERR/  in max14577_get_charger_state()
78 		/* Charger or USB-cable is connected */  in max14577_get_charger_state()
94  *  - POWER_SUPPLY_CHARGE_TYPE_NONE
95  *  - POWER_SUPPLY_CHARGE_TYPE_FAST
97 static int max14577_get_charge_type(struct max14577_charger *chg, int *val)  in max14577_get_charge_type()  argument
99 	int ret, charging;  in max14577_get_charge_type()
105 	 * "When the battery is fully charged, the 30-minute (typ)  in max14577_get_charge_type()
106 	 *  top-off timer starts. The device continues to trickle  in max14577_get_charge_type()
107 	 *  charge the battery until the top-off timer runs out."  in max14577_get_charge_type()
109 	ret = max14577_get_charger_state(chg, &charging);  in max14577_get_charge_type()
121 static int max14577_get_online(struct max14577_charger *chg, int *val)  in max14577_get_online()  argument
123 	struct regmap *rmap = chg->max14577->regmap;  in max14577_get_online()
125 	int ret;  in max14577_get_online()
133 	chg_type = maxim_get_charger_type(chg->max14577->dev_type, reg_data);  in max14577_get_online()
156  *  - POWER_SUPPLY_HEALTH_DEAD
157  *  - POWER_SUPPLY_HEALTH_OVERVOLTAGE
158  *  - POWER_SUPPLY_HEALTH_GOOD
160 static int max14577_get_battery_health(struct max14577_charger *chg, int *val)  in max14577_get_battery_health()  argument
162 	struct regmap *rmap = chg->max14577->regmap;  in max14577_get_battery_health()
163 	int ret;  in max14577_get_battery_health()
172 	chg_type = maxim_get_charger_type(chg->max14577->dev_type, reg_data);  in max14577_get_battery_health()
199 static int max14577_get_present(struct max14577_charger *chg, int *val)  in max14577_get_present()  argument
206 static int max14577_set_fast_charge_timer(struct max14577_charger *chg,  in max14577_set_fast_charge_timer()  argument
213 		reg_data = hours - 3;  in max14577_set_fast_charge_timer()
220 		dev_err(chg->dev, "Wrong value for Fast-Charge Timer: %lu\n",  in max14577_set_fast_charge_timer()
222 		return -EINVAL;  in max14577_set_fast_charge_timer()
226 	return max14577_update_reg(chg->max14577->regmap,  in max14577_set_fast_charge_timer()
230 static int max14577_init_constant_voltage(struct max14577_charger *chg,  in max14577_init_constant_voltage()  argument
231 		unsigned int uvolt)  in max14577_init_constant_voltage()
237 		return -EINVAL;  in max14577_init_constant_voltage()
244 		unsigned int val = uvolt;  in max14577_init_constant_voltage()
246 		val -= MAXIM_CHARGER_CONSTANT_VOLTAGE_MIN;  in max14577_init_constant_voltage()
253 		return -EINVAL;  in max14577_init_constant_voltage()
257 	return max14577_write_reg(chg->max14577->regmap,  in max14577_init_constant_voltage()
261 static int max14577_init_eoc(struct max14577_charger *chg,  in max14577_init_eoc()  argument
262 		unsigned int uamp)  in max14577_init_eoc()
264 	unsigned int current_bits;  in max14577_init_eoc()
267 	switch (chg->max14577->dev_type) {  in max14577_init_eoc()
270 			return -EINVAL; /* Requested current is too low */  in max14577_init_eoc()
278 			uamp = min(uamp, 100000U) - 50000U;  in max14577_init_eoc()
286 			return -EINVAL; /* Requested current is too low */  in max14577_init_eoc()
289 		uamp -= MAX14577_CHARGER_EOC_CURRENT_LIMIT_MIN;  in max14577_init_eoc()
296 	return max14577_update_reg(chg->max14577->regmap,  in max14577_init_eoc()
301 static int max14577_init_fast_charge(struct max14577_charger *chg,  in max14577_init_fast_charge()  argument
302 		unsigned int uamp)  in max14577_init_fast_charge()
305 	int ret;  in max14577_init_fast_charge()
307 		&maxim_charger_currents[chg->max14577->dev_type];  in max14577_init_fast_charge()
311 		dev_err(chg->dev, "Wrong value for fast charge: %u\n", uamp);  in max14577_init_fast_charge()
315 	return max14577_update_reg(chg->max14577->regmap,  in max14577_init_fast_charge()
326 static int max14577_charger_reg_init(struct max14577_charger *chg)  in max14577_charger_reg_init()  argument
328 	struct regmap *rmap = chg->max14577->regmap;  in max14577_charger_reg_init()
330 	int ret;  in max14577_charger_reg_init()
333 	 * Charger-Type Manual Detection, default off (set CHGTYPMAN to 0)  in max14577_charger_reg_init()
334 	 * Charger-Detection Enable, default on (set CHGDETEN to 1)  in max14577_charger_reg_init()
343 	 * Wall-Adapter Rapid Charge, default on  in max14577_charger_reg_init()
344 	 * Battery-Charger, default on  in max14577_charger_reg_init()
354 	ret = max14577_init_constant_voltage(chg, chg->pdata->constant_uvolt);  in max14577_charger_reg_init()
358 	ret = max14577_init_eoc(chg, chg->pdata->eoc_uamp);  in max14577_charger_reg_init()
362 	ret = max14577_init_fast_charge(chg, chg->pdata->fast_charge_uamp);  in max14577_charger_reg_init()
366 	ret = max14577_set_fast_charge_timer(chg,  in max14577_charger_reg_init()
371 	/* Initialize Overvoltage-Protection Threshold */  in max14577_charger_reg_init()
372 	switch (chg->pdata->ovp_uvolt) {  in max14577_charger_reg_init()
379 		reg_data = 0x1 + (chg->pdata->ovp_uvolt - 6000000) / 500000;  in max14577_charger_reg_init()
382 		dev_err(chg->dev, "Wrong value for OVP: %u\n",  in max14577_charger_reg_init()
383 				chg->pdata->ovp_uvolt);  in max14577_charger_reg_init()
384 		return -EINVAL;  in max14577_charger_reg_init()
404 	[MAXIM_DEVICE_TYPE_UNKNOWN]	= "MAX14577-like",
410 static int max14577_charger_get_property(struct power_supply *psy,  in max14577_charger_get_property()
414 	struct max14577_charger *chg = power_supply_get_drvdata(psy);  in max14577_charger_get_property()  local
415 	int ret = 0;  in max14577_charger_get_property()
419 		ret = max14577_get_charger_state(chg, &val->intval);  in max14577_charger_get_property()
422 		ret = max14577_get_charge_type(chg, &val->intval);  in max14577_charger_get_property()
425 		ret = max14577_get_battery_health(chg, &val->intval);  in max14577_charger_get_property()
428 		ret = max14577_get_present(chg, &val->intval);  in max14577_charger_get_property()
431 		ret = max14577_get_online(chg, &val->intval);  in max14577_charger_get_property()
435 		val->strval = model_names[chg->max14577->dev_type];  in max14577_charger_get_property()
438 		val->strval = manufacturer;  in max14577_charger_get_property()
441 		return -EINVAL;  in max14577_charger_get_property()
448 	.name = "max14577-charger",
460 	struct device_node *np = pdev->dev.of_node;  in max14577_charger_dt_init()
461 	int ret;  in max14577_charger_dt_init()
464 		dev_err(&pdev->dev, "No charger OF node\n");  in max14577_charger_dt_init()
465 		return ERR_PTR(-EINVAL);  in max14577_charger_dt_init()
468 	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);  in max14577_charger_dt_init()
470 		return ERR_PTR(-ENOMEM);  in max14577_charger_dt_init()
472 	ret = of_property_read_u32(np, "maxim,constant-uvolt",  in max14577_charger_dt_init()
473 			&pdata->constant_uvolt);  in max14577_charger_dt_init()
475 		dev_err(&pdev->dev, "Cannot parse maxim,constant-uvolt field from DT\n");  in max14577_charger_dt_init()
479 	ret = of_property_read_u32(np, "maxim,fast-charge-uamp",  in max14577_charger_dt_init()
480 			&pdata->fast_charge_uamp);  in max14577_charger_dt_init()
482 		dev_err(&pdev->dev, "Cannot parse maxim,fast-charge-uamp field from DT\n");  in max14577_charger_dt_init()
486 	ret = of_property_read_u32(np, "maxim,eoc-uamp", &pdata->eoc_uamp);  in max14577_charger_dt_init()
488 		dev_err(&pdev->dev, "Cannot parse maxim,eoc-uamp field from DT\n");  in max14577_charger_dt_init()
492 	ret = of_property_read_u32(np, "maxim,ovp-uvolt", &pdata->ovp_uvolt);  in max14577_charger_dt_init()
494 		dev_err(&pdev->dev, "Cannot parse maxim,ovp-uvolt field from DT\n");  in max14577_charger_dt_init()
511 	struct max14577_charger *chg = dev_get_drvdata(dev);  in show_fast_charge_timer()  local
513 	int ret;  in show_fast_charge_timer()
514 	unsigned int val;  in show_fast_charge_timer()
516 	ret = max14577_read_reg(chg->max14577->regmap, MAX14577_REG_CHGCTRL1,  in show_fast_charge_timer()
541 	struct max14577_charger *chg = dev_get_drvdata(dev);  in store_fast_charge_timer()  local
543 	int ret;  in store_fast_charge_timer()
549 	ret = max14577_set_fast_charge_timer(chg, val);  in store_fast_charge_timer()
559 static int max14577_charger_probe(struct platform_device *pdev)  in max14577_charger_probe()
561 	struct max14577_charger *chg;  in max14577_charger_probe()  local
563 	struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent);  in max14577_charger_probe()
564 	int ret;  in max14577_charger_probe()
566 	chg = devm_kzalloc(&pdev->dev, sizeof(*chg), GFP_KERNEL);  in max14577_charger_probe()
567 	if (!chg)  in max14577_charger_probe()
568 		return -ENOMEM;  in max14577_charger_probe()
570 	platform_set_drvdata(pdev, chg);  in max14577_charger_probe()
571 	chg->dev = &pdev->dev;  in max14577_charger_probe()
572 	chg->max14577 = max14577;  in max14577_charger_probe()
574 	chg->pdata = max14577_charger_dt_init(pdev);  in max14577_charger_probe()
575 	if (IS_ERR_OR_NULL(chg->pdata))  in max14577_charger_probe()
576 		return PTR_ERR(chg->pdata);  in max14577_charger_probe()
578 	ret = max14577_charger_reg_init(chg);  in max14577_charger_probe()
582 	ret = device_create_file(&pdev->dev, &dev_attr_fast_charge_timer);  in max14577_charger_probe()
584 		dev_err(&pdev->dev, "failed: create sysfs entry\n");  in max14577_charger_probe()
588 	psy_cfg.drv_data = chg;  in max14577_charger_probe()
589 	chg->charger = devm_power_supply_register(&pdev->dev,  in max14577_charger_probe()
592 	if (IS_ERR(chg->charger)) {  in max14577_charger_probe()
593 		dev_err(&pdev->dev, "failed: power supply register\n");  in max14577_charger_probe()
594 		ret = PTR_ERR(chg->charger);  in max14577_charger_probe()
605 	device_remove_file(&pdev->dev, &dev_attr_fast_charge_timer);  in max14577_charger_probe()
612 	device_remove_file(&pdev->dev, &dev_attr_fast_charge_timer);  in max14577_charger_remove()
616 	{ "max14577-charger", MAXIM_DEVICE_TYPE_MAX14577, },
617 	{ "max77836-charger", MAXIM_DEVICE_TYPE_MAX77836, },
623 	{ .compatible = "maxim,max14577-charger",
625 	{ .compatible = "maxim,max77836-charger",
633 		.name	= "max14577-charger",