drivers/power/supply/pf1550-charger.c

// SPDX-License-Identifier: GPL-2.0
/*
 * charger driver for the PF1550
 *
 * Copyright (C) 2016 Freescale Semiconductor, Inc.
 * Robin Gong <yibin.gong@freescale.com>
 *
 * Portions Copyright (c) 2025 Savoir-faire Linux Inc.
 * Samuel Kayode <samuel.kayode@savoirfairelinux.com>
 */

#include <linux/devm-helpers.h>
#include <linux/interrupt.h>
#include <linux/mfd/pf1550.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>

#define PF1550_DEFAULT_CONSTANT_VOLT	4200000
#define PF1550_DEFAULT_MIN_SYSTEM_VOLT	3500000
#define PF1550_DEFAULT_THERMAL_TEMP	95
#define PF1550_CHARGER_IRQ_NR		5

struct pf1550_charger {
	struct device *dev;
	const struct pf1550_ddata *pf1550;
	struct power_supply *charger;
	struct power_supply *battery;
	struct delayed_work vbus_sense_work;
	struct delayed_work chg_sense_work;
	struct delayed_work bat_sense_work;
	int virqs[PF1550_CHARGER_IRQ_NR];

	u32 constant_volt;
	u32 min_system_volt;
	u32 thermal_regulation_temp;
};

static int pf1550_get_charger_state(struct regmap *regmap, int *val)
{
	unsigned int data;
	int ret;

	ret = regmap_read(regmap, PF1550_CHARG_REG_CHG_SNS, &data);
	if (ret < 0)
		return ret;

	data &= PF1550_CHG_SNS_MASK;

	switch (data) {
	case PF1550_CHG_PRECHARGE:
	case PF1550_CHG_CONSTANT_CURRENT:
	case PF1550_CHG_CONSTANT_VOL:
	case PF1550_CHG_EOC:
		*val = POWER_SUPPLY_STATUS_CHARGING;
		break;
	case PF1550_CHG_DONE:
		*val = POWER_SUPPLY_STATUS_FULL;
		break;
	case PF1550_CHG_TIMER_FAULT:
	case PF1550_CHG_SUSPEND:
		*val = POWER_SUPPLY_STATUS_NOT_CHARGING;
		break;
	case PF1550_CHG_OFF_INV:
	case PF1550_CHG_OFF_TEMP:
	case PF1550_CHG_LINEAR_ONLY:
		*val = POWER_SUPPLY_STATUS_DISCHARGING;
		break;
	default:
		*val = POWER_SUPPLY_STATUS_UNKNOWN;
	}

	return 0;
}

static int pf1550_get_charge_type(struct regmap *regmap, int *val)
{
	unsigned int data;
	int ret;

	ret = regmap_read(regmap, PF1550_CHARG_REG_CHG_SNS, &data);
	if (ret < 0)
		return ret;

	data &= PF1550_CHG_SNS_MASK;

	switch (data) {
	case PF1550_CHG_SNS_MASK:
		*val = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
		break;
	case PF1550_CHG_CONSTANT_CURRENT:
	case PF1550_CHG_CONSTANT_VOL:
	case PF1550_CHG_EOC:
		*val = POWER_SUPPLY_CHARGE_TYPE_FAST;
		break;
	case PF1550_CHG_DONE:
	case PF1550_CHG_TIMER_FAULT:
	case PF1550_CHG_SUSPEND:
	case PF1550_CHG_OFF_INV:
	case PF1550_CHG_BAT_OVER:
	case PF1550_CHG_OFF_TEMP:
	case PF1550_CHG_LINEAR_ONLY:
		*val = POWER_SUPPLY_CHARGE_TYPE_NONE;
		break;
	default:
		*val = POWER_SUPPLY_CHARGE_TYPE_UNKNOWN;
	}

	return 0;
}

/*
 * Supported health statuses:
 *  - POWER_SUPPLY_HEALTH_DEAD
 *  - POWER_SUPPLY_HEALTH_GOOD
 *  - POWER_SUPPLY_HEALTH_OVERVOLTAGE
 *  - POWER_SUPPLY_HEALTH_UNKNOWN
 */
static int pf1550_get_battery_health(struct regmap *regmap, int *val)
{
	unsigned int data;
	int ret;

	ret = regmap_read(regmap, PF1550_CHARG_REG_BATT_SNS, &data);
	if (ret < 0)
		return ret;

	data &= PF1550_BAT_SNS_MASK;

	switch (data) {
	case PF1550_BAT_NO_DETECT:
		*val = POWER_SUPPLY_HEALTH_NO_BATTERY;
		break;
	case PF1550_BAT_NO_VBUS:
	case PF1550_BAT_LOW_THAN_PRECHARG:
	case PF1550_BAT_CHARG_FAIL:
	case PF1550_BAT_HIGH_THAN_PRECHARG:
		*val = POWER_SUPPLY_HEALTH_GOOD;
		break;
	case PF1550_BAT_OVER_VOL:
		*val = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
		break;
	default:
		*val = POWER_SUPPLY_HEALTH_UNKNOWN;
		break;
	}

	return 0;
}

static int pf1550_get_present(struct regmap *regmap, int *val)
{
	unsigned int data;
	int ret;

	ret = regmap_read(regmap, PF1550_CHARG_REG_BATT_SNS, &data);
	if (ret < 0)
		return ret;

	data &= PF1550_BAT_SNS_MASK;
	*val = (data == PF1550_BAT_NO_DETECT) ? 0 : 1;

	return 0;
}

static int pf1550_get_online(struct regmap *regmap, int *val)
{
	unsigned int data;
	int ret;

	ret = regmap_read(regmap, PF1550_CHARG_REG_VBUS_SNS, &data);
	if (ret < 0)
		return ret;

	*val = (data & PF1550_VBUS_VALID) ? 1 : 0;

	return 0;
}

static void pf1550_chg_bat_work(struct work_struct *work)
{
	struct pf1550_charger *chg = container_of(to_delayed_work(work),
						  struct pf1550_charger,
						  bat_sense_work);
	unsigned int data;

	if (regmap_read(chg->pf1550->regmap, PF1550_CHARG_REG_BATT_SNS, &data)) {
		dev_err(chg->dev, "Read BATT_SNS error.\n");
		return;
	}

	switch (data & PF1550_BAT_SNS_MASK) {
	case PF1550_BAT_NO_VBUS:
		dev_dbg(chg->dev, "No valid VBUS input.\n");
		break;
	case PF1550_BAT_LOW_THAN_PRECHARG:
		dev_dbg(chg->dev, "VBAT < VPRECHG.LB.\n");
		break;
	case PF1550_BAT_CHARG_FAIL:
		dev_dbg(chg->dev, "Battery charging failed.\n");
		break;
	case PF1550_BAT_HIGH_THAN_PRECHARG:
		dev_dbg(chg->dev, "VBAT > VPRECHG.LB.\n");
		break;
	case PF1550_BAT_OVER_VOL:
		dev_dbg(chg->dev, "VBAT > VBATOV.\n");
		break;
	case PF1550_BAT_NO_DETECT:
		dev_dbg(chg->dev, "Battery not detected.\n");
		break;
	default:
		dev_err(chg->dev, "Unknown value read:%x\n",
			data & PF1550_CHG_SNS_MASK);
	}
}

static void pf1550_chg_chg_work(struct work_struct *work)
{
	struct pf1550_charger *chg = container_of(to_delayed_work(work),
						  struct pf1550_charger,
						  chg_sense_work);
	unsigned int data;

	if (regmap_read(chg->pf1550->regmap, PF1550_CHARG_REG_CHG_SNS, &data)) {
		dev_err(chg->dev, "Read CHG_SNS error.\n");
		return;
	}

	switch (data & PF1550_CHG_SNS_MASK) {
	case PF1550_CHG_PRECHARGE:
		dev_dbg(chg->dev, "In pre-charger mode.\n");
		break;
	case PF1550_CHG_CONSTANT_CURRENT:
		dev_dbg(chg->dev, "In fast-charge constant current mode.\n");
		break;
	case PF1550_CHG_CONSTANT_VOL:
		dev_dbg(chg->dev, "In fast-charge constant voltage mode.\n");
		break;
	case PF1550_CHG_EOC:
		dev_dbg(chg->dev, "In EOC mode.\n");
		break;
	case PF1550_CHG_DONE:
		dev_dbg(chg->dev, "In DONE mode.\n");
		break;
	case PF1550_CHG_TIMER_FAULT:
		dev_info(chg->dev, "In timer fault mode.\n");
		break;
	case PF1550_CHG_SUSPEND:
		dev_info(chg->dev, "In thermistor suspend mode.\n");
		break;
	case PF1550_CHG_OFF_INV:
		dev_info(chg->dev, "Input invalid, charger off.\n");
		break;
	case PF1550_CHG_BAT_OVER:
		dev_warn(chg->dev, "Battery over-voltage.\n");
		break;
	case PF1550_CHG_OFF_TEMP:
		dev_info(chg->dev, "Temp high, charger off.\n");
		break;
	case PF1550_CHG_LINEAR_ONLY:
		dev_dbg(chg->dev, "In Linear mode, not charging.\n");
		break;
	default:
		dev_err(chg->dev, "Unknown value read:%x\n",
			data & PF1550_CHG_SNS_MASK);
	}
}

static void pf1550_chg_vbus_work(struct work_struct *work)
{
	struct pf1550_charger *chg = container_of(to_delayed_work(work),
						  struct pf1550_charger,
						  vbus_sense_work);
	unsigned int data;

	if (regmap_read(chg->pf1550->regmap, PF1550_CHARG_REG_VBUS_SNS, &data)) {
		dev_err(chg->dev, "Read VBUS_SNS error.\n");
		return;
	}

	if (data & PF1550_VBUS_UVLO) {
		dev_dbg(chg->dev, "VBUS detached.\n");
		power_supply_changed(chg->battery);
	}
	if (data & PF1550_VBUS_IN2SYS)
		dev_dbg(chg->dev, "VBUS_IN2SYS_SNS.\n");
	if (data & PF1550_VBUS_OVLO)
		dev_dbg(chg->dev, "VBUS_OVLO_SNS.\n");
	if (data & PF1550_VBUS_VALID) {
		dev_dbg(chg->dev, "VBUS attached.\n");
		power_supply_changed(chg->charger);
	}
}

static irqreturn_t pf1550_charger_irq_handler(int irq, void *data)
{
	struct pf1550_charger *chg = data;
	struct device *dev = chg->dev;
	int i, irq_type = -1;

	for (i = 0; i < PF1550_CHARGER_IRQ_NR; i++)
		if (irq == chg->virqs[i])
			irq_type = i;

	switch (irq_type) {
	case PF1550_CHARG_IRQ_BAT2SOCI:
		dev_info(dev, "BAT to SYS Overcurrent interrupt.\n");
		break;
	case PF1550_CHARG_IRQ_BATI:
		schedule_delayed_work(&chg->bat_sense_work,
				      msecs_to_jiffies(10));
		break;
	case PF1550_CHARG_IRQ_CHGI:
		schedule_delayed_work(&chg->chg_sense_work,
				      msecs_to_jiffies(10));
		break;
	case PF1550_CHARG_IRQ_VBUSI:
		schedule_delayed_work(&chg->vbus_sense_work,
				      msecs_to_jiffies(10));
		break;
	case PF1550_CHARG_IRQ_THMI:
		dev_info(dev, "Thermal interrupt.\n");
		break;
	default:
		dev_err(dev, "unknown interrupt occurred.\n");
	}

	return IRQ_HANDLED;
}

static enum power_supply_property pf1550_charger_props[] = {
	POWER_SUPPLY_PROP_ONLINE,
	POWER_SUPPLY_PROP_MODEL_NAME,
	POWER_SUPPLY_PROP_MANUFACTURER,
};

static enum power_supply_property pf1550_battery_props[] = {
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_CHARGE_TYPE,
	POWER_SUPPLY_PROP_HEALTH,
	POWER_SUPPLY_PROP_PRESENT,
	POWER_SUPPLY_PROP_MODEL_NAME,
	POWER_SUPPLY_PROP_MANUFACTURER,
};

static int pf1550_charger_get_property(struct power_supply *psy,
				       enum power_supply_property psp,
				       union power_supply_propval *val)
{
	struct pf1550_charger *chg = power_supply_get_drvdata(psy);
	struct regmap *regmap = chg->pf1550->regmap;
	int ret = 0;

	switch (psp) {
	case POWER_SUPPLY_PROP_STATUS:
		ret = pf1550_get_charger_state(regmap, &val->intval);
		break;
	case POWER_SUPPLY_PROP_CHARGE_TYPE:
		ret = pf1550_get_charge_type(regmap, &val->intval);
		break;
	case POWER_SUPPLY_PROP_HEALTH:
		ret = pf1550_get_battery_health(regmap, &val->intval);
		break;
	case POWER_SUPPLY_PROP_PRESENT:
		ret = pf1550_get_present(regmap, &val->intval);
		break;
	case POWER_SUPPLY_PROP_ONLINE:
		ret = pf1550_get_online(regmap, &val->intval);
		break;
	case POWER_SUPPLY_PROP_MODEL_NAME:
		val->strval = "PF1550";
		break;
	case POWER_SUPPLY_PROP_MANUFACTURER:
		val->strval = "NXP";
		break;
	default:
		return -EINVAL;
	}

	return ret;
}

static const struct power_supply_desc pf1550_charger_desc = {
	.name = "pf1550-charger",
	.type = POWER_SUPPLY_TYPE_MAINS,
	.properties = pf1550_charger_props,
	.num_properties = ARRAY_SIZE(pf1550_charger_props),
	.get_property = pf1550_charger_get_property,
};

static const struct power_supply_desc pf1550_battery_desc = {
	.name = "pf1550-battery",
	.type = POWER_SUPPLY_TYPE_BATTERY,
	.properties = pf1550_battery_props,
	.num_properties = ARRAY_SIZE(pf1550_battery_props),
	.get_property = pf1550_charger_get_property,
};

static int pf1550_set_constant_volt(struct pf1550_charger *chg,
				    unsigned int uvolt)
{
	unsigned int data;

	if (uvolt >= 3500000 && uvolt <= 4440000)
		data = 8 + (uvolt - 3500000) / 20000;
	else
		return dev_err_probe(chg->dev, -EINVAL,
				     "Wrong value for constant voltage\n");

	dev_dbg(chg->dev, "Charging constant voltage: %u (0x%x)\n", uvolt,
		data);

	return regmap_update_bits(chg->pf1550->regmap,
				  PF1550_CHARG_REG_BATT_REG,
				  PF1550_CHARG_REG_BATT_REG_CHGCV_MASK, data);
}

static int pf1550_set_min_system_volt(struct pf1550_charger *chg,
				      unsigned int uvolt)
{
	unsigned int data;

	switch (uvolt) {
	case 3500000:
		data = 0x0;
		break;
	case 3700000:
		data = 0x1;
		break;
	case 4300000:
		data = 0x2;
		break;
	default:
		return dev_err_probe(chg->dev, -EINVAL,
				     "Wrong value for minimum system voltage\n");
	}

	data <<= PF1550_CHARG_REG_BATT_REG_VMINSYS_SHIFT;

	dev_dbg(chg->dev, "Minimum system regulation voltage: %u (0x%x)\n",
		uvolt, data);

	return regmap_update_bits(chg->pf1550->regmap,
				  PF1550_CHARG_REG_BATT_REG,
				  PF1550_CHARG_REG_BATT_REG_VMINSYS_MASK, data);
}

static int pf1550_set_thermal_regulation_temp(struct pf1550_charger *chg,
					      unsigned int cells)
{
	unsigned int data;

	switch (cells) {
	case 80:
		data = 0x0;
		break;
	case 95:
		data = 0x1;
		break;
	case 110:
		data = 0x2;
		break;
	case 125:
		data = 0x3;
		break;
	default:
		return dev_err_probe(chg->dev, -EINVAL,
				     "Wrong value for thermal temperature\n");
	}

	data <<= PF1550_CHARG_REG_THM_REG_CNFG_REGTEMP_SHIFT;

	dev_dbg(chg->dev, "Thermal regulation loop temperature: %u (0x%x)\n",
		cells, data);

	return regmap_update_bits(chg->pf1550->regmap,
				  PF1550_CHARG_REG_THM_REG_CNFG,
				  PF1550_CHARG_REG_THM_REG_CNFG_REGTEMP_MASK,
				  data);
}

/*
 * Sets charger registers to proper and safe default values.
 */
static int pf1550_reg_init(struct pf1550_charger *chg)
{
	struct power_supply_battery_info *info;
	struct device *dev = chg->dev;
	int ret;

	/* Unmask charger interrupt, mask DPMI and reserved bit */
	ret =  regmap_write(chg->pf1550->regmap, PF1550_CHARG_REG_CHG_INT_MASK,
			    PF1550_CHG_INT_MASK);
	if (ret)
		return dev_err_probe(dev, ret,
				     "Error unmask charger interrupt\n");

	ret = pf1550_set_constant_volt(chg, chg->constant_volt);
	if (ret)
		return ret;

	ret = pf1550_set_min_system_volt(chg, chg->min_system_volt);
	if (ret)
		return ret;

	ret = pf1550_set_thermal_regulation_temp(chg,
						 chg->thermal_regulation_temp);
	if (ret)
		return ret;

	/*
	 * The PF1550 charger has 3 modes of operation. By default, the charger
	 * is in mode 1; it remains off. Appropriate for applications not using
	 * a battery. The other supported mode is mode 2, the charger is turned
	 * on to charge a battery when present.
	 */
	if (power_supply_get_battery_info(chg->charger, &info)) {
		ret = regmap_write(chg->pf1550->regmap,
				   PF1550_CHARG_REG_CHG_OPER,
				   PF1550_CHG_BAT_ON);
		if (ret)
			return dev_err_probe(dev, ret,
					     "Error turn on charger\n");
	}

	return 0;
}

static void pf1550_dt_parse_dev_info(struct pf1550_charger *chg)
{
	struct power_supply_battery_info *info;
	struct device *dev = chg->dev;

	if (device_property_read_u32(dev->parent, "nxp,min-system-microvolt",
				     &chg->min_system_volt))
		chg->min_system_volt = PF1550_DEFAULT_MIN_SYSTEM_VOLT;

	if (device_property_read_u32(dev->parent,
				     "nxp,thermal-regulation-celsius",
				     &chg->thermal_regulation_temp))
		chg->thermal_regulation_temp = PF1550_DEFAULT_THERMAL_TEMP;

	if (power_supply_get_battery_info(chg->charger, &info))
		chg->constant_volt = PF1550_DEFAULT_CONSTANT_VOLT;
	else
		chg->constant_volt = info->constant_charge_voltage_max_uv;
}

static int pf1550_charger_probe(struct platform_device *pdev)
{
	const struct pf1550_ddata *pf1550 = dev_get_drvdata(pdev->dev.parent);
	struct power_supply_config psy_cfg = {};
	struct pf1550_charger *chg;
	int i, irq, ret;

	chg = devm_kzalloc(&pdev->dev, sizeof(*chg), GFP_KERNEL);
	if (!chg)
		return -ENOMEM;

	chg->dev = &pdev->dev;
	chg->pf1550 = pf1550;

	if (!chg->pf1550->regmap)
		return dev_err_probe(&pdev->dev, -ENODEV,
				     "failed to get regmap\n");

	platform_set_drvdata(pdev, chg);

	ret = devm_delayed_work_autocancel(chg->dev, &chg->vbus_sense_work,
					   pf1550_chg_vbus_work);
	if (ret)
		return dev_err_probe(chg->dev, ret,
				     "failed to add vbus sense work\n");

	ret = devm_delayed_work_autocancel(chg->dev, &chg->chg_sense_work,
					   pf1550_chg_chg_work);
	if (ret)
		return dev_err_probe(chg->dev, ret,
				     "failed to add charger sense work\n");

	ret = devm_delayed_work_autocancel(chg->dev, &chg->bat_sense_work,
					   pf1550_chg_bat_work);
	if (ret)
		return dev_err_probe(chg->dev, ret,
				     "failed to add battery sense work\n");

	psy_cfg.drv_data = chg;

	chg->charger = devm_power_supply_register(&pdev->dev,
						  &pf1550_charger_desc,
						  &psy_cfg);
	if (IS_ERR(chg->charger))
		return dev_err_probe(&pdev->dev, PTR_ERR(chg->charger),
				     "failed: power supply register\n");

	chg->battery = devm_power_supply_register(&pdev->dev,
						  &pf1550_battery_desc,
						  &psy_cfg);
	if (IS_ERR(chg->battery))
		return dev_err_probe(&pdev->dev, PTR_ERR(chg->battery),
				     "failed: power supply register\n");

	for (i = 0; i < PF1550_CHARGER_IRQ_NR; i++) {
		irq = platform_get_irq(pdev, i);
		if (irq < 0)
			return irq;

		chg->virqs[i] = irq;

		ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
						pf1550_charger_irq_handler,
						IRQF_NO_SUSPEND,
						"pf1550-charger", chg);
		if (ret)
			return dev_err_probe(&pdev->dev, ret,
					     "failed irq request\n");
	}

	pf1550_dt_parse_dev_info(chg);

	return pf1550_reg_init(chg);
}

static const struct platform_device_id pf1550_charger_id[] = {
	{ "pf1550-charger", },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(platform, pf1550_charger_id);

static struct platform_driver pf1550_charger_driver = {
	.driver = {
		.name	= "pf1550-charger",
	},
	.probe		= pf1550_charger_probe,
	.id_table	= pf1550_charger_id,
};
module_platform_driver(pf1550_charger_driver);

MODULE_AUTHOR("Robin Gong <yibin.gong@freescale.com>");
MODULE_DESCRIPTION("PF1550 charger driver");
MODULE_LICENSE("GPL");