drivers/power/supply/max8997_charger.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0+
 //
 // max8997_charger.c - Power supply consumer driver for the Maxim 8997/8966
 //
 //  Copyright (C) 2011 Samsung Electronics
 //  MyungJoo Ham <myungjoo.ham@samsung.com>

 #include <linux/err.h>
 #include <linux/extcon.h>
 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/platform_device.h>
 #include <linux/power_supply.h>
 #include <linux/mfd/max8997.h>
 #include <linux/mfd/max8997-private.h>
 #include <linux/regulator/consumer.h>
 #include <linux/devm-helpers.h>

 /* MAX8997_REG_STATUS4 */
 #define DCINOK_SHIFT		1
 #define DCINOK_MASK		(1 << DCINOK_SHIFT)
 #define DETBAT_SHIFT		2
 #define DETBAT_MASK		(1 << DETBAT_SHIFT)

 /* MAX8997_REG_MBCCTRL1 */
 #define TFCH_SHIFT		4
 #define TFCH_MASK		(7 << TFCH_SHIFT)

 /* MAX8997_REG_MBCCTRL5 */
 #define ITOPOFF_SHIFT		0
 #define ITOPOFF_MASK		(0xF << ITOPOFF_SHIFT)

 struct charger_data {
 	struct device *dev;
 	struct max8997_dev *iodev;
 	struct power_supply *battery;
 	struct regulator *reg;
 	struct extcon_dev *edev;
 	struct notifier_block extcon_nb;
 	struct work_struct extcon_work;
 };

 static enum power_supply_property max8997_battery_props[] = {
 	POWER_SUPPLY_PROP_STATUS, /* "FULL", "CHARGING" or "DISCHARGING". */
 	POWER_SUPPLY_PROP_PRESENT, /* the presence of battery */
 	POWER_SUPPLY_PROP_ONLINE, /* charger is active or not */
 };

 /* Note that the charger control is done by a current regulator "CHARGER" */
 static int max8997_battery_get_property(struct power_supply *psy,
 		enum power_supply_property psp,
 		union power_supply_propval *val)
 {
 	struct charger_data *charger = power_supply_get_drvdata(psy);
 	struct i2c_client *i2c = charger->iodev->i2c;
 	int ret;
 	u8 reg;

 	switch (psp) {
 	case POWER_SUPPLY_PROP_STATUS:
 		val->intval = 0;
 		ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, &reg);
 		if (ret)
 			return ret;
 		if ((reg & (1 << 0)) == 0x1)
 			val->intval = POWER_SUPPLY_STATUS_FULL;
 		else if ((reg & DCINOK_MASK))
 			val->intval = POWER_SUPPLY_STATUS_CHARGING;
 		else
 			val->intval = POWER_SUPPLY_STATUS_DISCHARGING;

 		break;
 	case POWER_SUPPLY_PROP_PRESENT:
 		val->intval = 0;
 		ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, &reg);
 		if (ret)
 			return ret;
 		if ((reg & DETBAT_MASK) == 0x0)
 			val->intval = 1;

 		break;
 	case POWER_SUPPLY_PROP_ONLINE:
 		val->intval = 0;
 		ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, &reg);
 		if (ret)
 			return ret;
 		if (reg & DCINOK_MASK)
 			val->intval = 1;

 		break;
 	default:
 		return -EINVAL;
 	}

 	return 0;
 }

 static void max8997_battery_extcon_evt_worker(struct work_struct *work)
 {
 	struct charger_data *charger =
 	    container_of(work, struct charger_data, extcon_work);
 	struct extcon_dev *edev = charger->edev;
 	int current_limit;

 	if (extcon_get_state(edev, EXTCON_CHG_USB_SDP) > 0) {
 		dev_dbg(charger->dev, "USB SDP charger is connected\n");
 		current_limit = 450000;
 	} else if (extcon_get_state(edev, EXTCON_CHG_USB_DCP) > 0) {
 		dev_dbg(charger->dev, "USB DCP charger is connected\n");
 		current_limit = 650000;
 	} else if (extcon_get_state(edev, EXTCON_CHG_USB_FAST) > 0) {
 		dev_dbg(charger->dev, "USB FAST charger is connected\n");
 		current_limit = 650000;
 	} else if (extcon_get_state(edev, EXTCON_CHG_USB_SLOW) > 0) {
 		dev_dbg(charger->dev, "USB SLOW charger is connected\n");
 		current_limit = 650000;
 	} else if (extcon_get_state(edev, EXTCON_CHG_USB_CDP) > 0) {
 		dev_dbg(charger->dev, "USB CDP charger is connected\n");
 		current_limit = 650000;
 	} else {
 		dev_dbg(charger->dev, "USB charger is disconnected\n");
 		current_limit = -1;
 	}

 	if (current_limit > 0) {
 		int ret = regulator_set_current_limit(charger->reg, current_limit, current_limit);

 		if (ret) {
 			dev_err(charger->dev, "failed to set current limit: %d\n", ret);
 			return;
 		}
 		ret = regulator_enable(charger->reg);
 		if (ret)
 			dev_err(charger->dev, "failed to enable regulator: %d\n", ret);
 	} else {
 		int ret  = regulator_disable(charger->reg);

 		if (ret)
 			dev_err(charger->dev, "failed to disable regulator: %d\n", ret);
 	}
 }

 static int max8997_battery_extcon_evt(struct notifier_block *nb,
 				unsigned long event, void *param)
 {
 	struct charger_data *charger =
 		container_of(nb, struct charger_data, extcon_nb);
 	schedule_work(&charger->extcon_work);
 	return NOTIFY_OK;
 }

 static const struct power_supply_desc max8997_battery_desc = {
 	.name		= "max8997_pmic",
 	.type		= POWER_SUPPLY_TYPE_BATTERY,
 	.get_property	= max8997_battery_get_property,
 	.properties	= max8997_battery_props,
 	.num_properties	= ARRAY_SIZE(max8997_battery_props),
 };

 static int max8997_battery_probe(struct platform_device *pdev)
 {
 	int ret = 0;
 	struct charger_data *charger;
 	struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 	struct device_node *np = pdev->dev.of_node;
 	struct i2c_client *i2c = iodev->i2c;
 	struct max8997_platform_data *pdata = iodev->pdata;
 	struct power_supply_config psy_cfg = {};

 	if (!pdata) {
 		dev_err(&pdev->dev, "No platform data supplied.\n");
 		return -EINVAL;
 	}

 	if (pdata->eoc_mA) {
 		int val = (pdata->eoc_mA - 50) / 10;
 		if (val < 0)
 			val = 0;
 		if (val > 0xf)
 			val = 0xf;

 		ret = max8997_update_reg(i2c, MAX8997_REG_MBCCTRL5,
 				val << ITOPOFF_SHIFT, ITOPOFF_MASK);
 		if (ret < 0) {
 			dev_err(&pdev->dev, "Cannot use i2c bus.\n");
 			return ret;
 		}
 	}
 	switch (pdata->timeout) {
 	case 5:
 		ret = max8997_update_reg(i2c, MAX8997_REG_MBCCTRL1,
 				0x2 << TFCH_SHIFT, TFCH_MASK);
 		break;
 	case 6:
 		ret = max8997_update_reg(i2c, MAX8997_REG_MBCCTRL1,
 				0x3 << TFCH_SHIFT, TFCH_MASK);
 		break;
 	case 7:
 		ret = max8997_update_reg(i2c, MAX8997_REG_MBCCTRL1,
 				0x4 << TFCH_SHIFT, TFCH_MASK);
 		break;
 	case 0:
 		ret = max8997_update_reg(i2c, MAX8997_REG_MBCCTRL1,
 				0x7 << TFCH_SHIFT, TFCH_MASK);
 		break;
 	default:
 		dev_err(&pdev->dev, "incorrect timeout value (%d)\n",
 				pdata->timeout);
 		return -EINVAL;
 	}
 	if (ret < 0) {
 		dev_err(&pdev->dev, "Cannot use i2c bus.\n");
 		return ret;
 	}

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

 	platform_set_drvdata(pdev, charger);

 	charger->dev = &pdev->dev;
 	charger->iodev = iodev;

 	psy_cfg.drv_data = charger;

 	charger->battery = devm_power_supply_register(&pdev->dev,
 						 &max8997_battery_desc,
 						 &psy_cfg);
 	if (IS_ERR(charger->battery)) {
 		dev_err(&pdev->dev, "failed: power supply register\n");
 		return PTR_ERR(charger->battery);
 	}

 	// grab regulator from parent device's node
 	pdev->dev.of_node = iodev->dev->of_node;
 	charger->reg = devm_regulator_get_optional(&pdev->dev, "charger");
 	pdev->dev.of_node = np;
 	if (IS_ERR(charger->reg)) {
 		if (PTR_ERR(charger->reg) == -EPROBE_DEFER)
 			return -EPROBE_DEFER;
 		dev_info(&pdev->dev, "couldn't get charger regulator\n");
 	}
 	charger->edev = extcon_get_extcon_dev("max8997-muic");
 	if (IS_ERR_OR_NULL(charger->edev)) {
 		if (!charger->edev)
 			return -EPROBE_DEFER;
 		dev_info(charger->dev, "couldn't get extcon device\n");
 	}

 	if (!IS_ERR(charger->reg) && !IS_ERR_OR_NULL(charger->edev)) {
 		ret = devm_work_autocancel(&pdev->dev, &charger->extcon_work,
 					   max8997_battery_extcon_evt_worker);
 		if (ret) {
 			dev_err(&pdev->dev, "failed to add extcon evt stop action: %d\n", ret);
 			return ret;
 		}
 		charger->extcon_nb.notifier_call = max8997_battery_extcon_evt;
 		ret = devm_extcon_register_notifier_all(&pdev->dev, charger->edev,
 							&charger->extcon_nb);
 		if (ret) {
 			dev_err(&pdev->dev, "failed to register extcon notifier\n");
 			return ret;
 		}
 	}

 	return 0;
 }

 static const struct platform_device_id max8997_battery_id[] = {
 	{ "max8997-battery", 0 },
 	{ }
 };
 MODULE_DEVICE_TABLE(platform, max8997_battery_id);

 static struct platform_driver max8997_battery_driver = {
 	.driver = {
 		.name = "max8997-battery",
 	},
 	.probe = max8997_battery_probe,
 	.id_table = max8997_battery_id,
 };
 module_platform_driver(max8997_battery_driver);

 MODULE_DESCRIPTION("MAXIM 8997/8966 battery control driver");
 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
 MODULE_LICENSE("GPL");
	// SPDX-License-Identifier: GPL-2.0+
	//
	// max8997_charger.c - Power supply consumer driver for the Maxim 8997/8966
	//
	// Copyright (C) 2011 Samsung Electronics
	// MyungJoo Ham <myungjoo.ham@samsung.com>

	#include <linux/err.h>
	#include <linux/extcon.h>
	#include <linux/module.h>
	#include <linux/slab.h>
	#include <linux/platform_device.h>
	#include <linux/power_supply.h>
	#include <linux/mfd/max8997.h>
	#include <linux/mfd/max8997-private.h>
	#include <linux/regulator/consumer.h>
	#include <linux/devm-helpers.h>

	/* MAX8997_REG_STATUS4 */
	#define DCINOK_SHIFT 1
	#define DCINOK_MASK (1 << DCINOK_SHIFT)
	#define DETBAT_SHIFT 2
	#define DETBAT_MASK (1 << DETBAT_SHIFT)

	/* MAX8997_REG_MBCCTRL1 */
	#define TFCH_SHIFT 4
	#define TFCH_MASK (7 << TFCH_SHIFT)

	/* MAX8997_REG_MBCCTRL5 */
	#define ITOPOFF_SHIFT 0
	#define ITOPOFF_MASK (0xF << ITOPOFF_SHIFT)

	struct charger_data {
	struct device *dev;
	struct max8997_dev *iodev;
	struct power_supply *battery;
	struct regulator *reg;
	struct extcon_dev *edev;
	struct notifier_block extcon_nb;
	struct work_struct extcon_work;
	};

	static enum power_supply_property max8997_battery_props[] = {
	POWER_SUPPLY_PROP_STATUS, /* "FULL", "CHARGING" or "DISCHARGING". */
	POWER_SUPPLY_PROP_PRESENT, /* the presence of battery */
	POWER_SUPPLY_PROP_ONLINE, /* charger is active or not */
	};

	/* Note that the charger control is done by a current regulator "CHARGER" */
	static int max8997_battery_get_property(struct power_supply *psy,
	enum power_supply_property psp,
	union power_supply_propval *val)
	{
	struct charger_data *charger = power_supply_get_drvdata(psy);
	struct i2c_client *i2c = charger->iodev->i2c;
	int ret;
	u8 reg;

	switch (psp) {
	case POWER_SUPPLY_PROP_STATUS:
	val->intval = 0;
	ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, &reg);
	if (ret)
	return ret;
	if ((reg & (1 << 0)) == 0x1)
	val->intval = POWER_SUPPLY_STATUS_FULL;
	else if ((reg & DCINOK_MASK))
	val->intval = POWER_SUPPLY_STATUS_CHARGING;
	else
	val->intval = POWER_SUPPLY_STATUS_DISCHARGING;

	break;
	case POWER_SUPPLY_PROP_PRESENT:
	val->intval = 0;
	ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, &reg);
	if (ret)
	return ret;
	if ((reg & DETBAT_MASK) == 0x0)
	val->intval = 1;

	break;
	case POWER_SUPPLY_PROP_ONLINE:
	val->intval = 0;
	ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, &reg);
	if (ret)
	return ret;
	if (reg & DCINOK_MASK)
	val->intval = 1;

	break;
	default:
	return -EINVAL;
	}

	return 0;
	}

	static void max8997_battery_extcon_evt_worker(struct work_struct *work)
	{
	struct charger_data *charger =
	container_of(work, struct charger_data, extcon_work);
	struct extcon_dev *edev = charger->edev;
	int current_limit;

	if (extcon_get_state(edev, EXTCON_CHG_USB_SDP) > 0) {
	dev_dbg(charger->dev, "USB SDP charger is connected\n");
	current_limit = 450000;
	} else if (extcon_get_state(edev, EXTCON_CHG_USB_DCP) > 0) {
	dev_dbg(charger->dev, "USB DCP charger is connected\n");
	current_limit = 650000;
	} else if (extcon_get_state(edev, EXTCON_CHG_USB_FAST) > 0) {
	dev_dbg(charger->dev, "USB FAST charger is connected\n");
	current_limit = 650000;
	} else if (extcon_get_state(edev, EXTCON_CHG_USB_SLOW) > 0) {
	dev_dbg(charger->dev, "USB SLOW charger is connected\n");
	current_limit = 650000;
	} else if (extcon_get_state(edev, EXTCON_CHG_USB_CDP) > 0) {
	dev_dbg(charger->dev, "USB CDP charger is connected\n");
	current_limit = 650000;
	} else {
	dev_dbg(charger->dev, "USB charger is disconnected\n");
	current_limit = -1;
	}

	if (current_limit > 0) {
	int ret = regulator_set_current_limit(charger->reg, current_limit, current_limit);

	if (ret) {
	dev_err(charger->dev, "failed to set current limit: %d\n", ret);
	return;
	}
	ret = regulator_enable(charger->reg);
	if (ret)
	dev_err(charger->dev, "failed to enable regulator: %d\n", ret);
	} else {
	int ret = regulator_disable(charger->reg);

	if (ret)
	dev_err(charger->dev, "failed to disable regulator: %d\n", ret);
	}
	}

	static int max8997_battery_extcon_evt(struct notifier_block *nb,
	unsigned long event, void *param)
	{
	struct charger_data *charger =
	container_of(nb, struct charger_data, extcon_nb);
	schedule_work(&charger->extcon_work);
	return NOTIFY_OK;
	}

	static const struct power_supply_desc max8997_battery_desc = {
	.name = "max8997_pmic",
	.type = POWER_SUPPLY_TYPE_BATTERY,
	.get_property = max8997_battery_get_property,
	.properties = max8997_battery_props,
	.num_properties = ARRAY_SIZE(max8997_battery_props),
	};

	static int max8997_battery_probe(struct platform_device *pdev)
	{
	int ret = 0;
	struct charger_data *charger;
	struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
	struct device_node *np = pdev->dev.of_node;
	struct i2c_client *i2c = iodev->i2c;
	struct max8997_platform_data *pdata = iodev->pdata;
	struct power_supply_config psy_cfg = {};

	if (!pdata) {
	dev_err(&pdev->dev, "No platform data supplied.\n");
	return -EINVAL;
	}

	if (pdata->eoc_mA) {
	int val = (pdata->eoc_mA - 50) / 10;
	if (val < 0)
	val = 0;
	if (val > 0xf)
	val = 0xf;

	ret = max8997_update_reg(i2c, MAX8997_REG_MBCCTRL5,
	val << ITOPOFF_SHIFT, ITOPOFF_MASK);
	if (ret < 0) {
	dev_err(&pdev->dev, "Cannot use i2c bus.\n");
	return ret;
	}
	}
	switch (pdata->timeout) {
	case 5:
	ret = max8997_update_reg(i2c, MAX8997_REG_MBCCTRL1,
	0x2 << TFCH_SHIFT, TFCH_MASK);
	break;
	case 6:
	ret = max8997_update_reg(i2c, MAX8997_REG_MBCCTRL1,
	0x3 << TFCH_SHIFT, TFCH_MASK);
	break;
	case 7:
	ret = max8997_update_reg(i2c, MAX8997_REG_MBCCTRL1,
	0x4 << TFCH_SHIFT, TFCH_MASK);
	break;
	case 0:
	ret = max8997_update_reg(i2c, MAX8997_REG_MBCCTRL1,
	0x7 << TFCH_SHIFT, TFCH_MASK);
	break;
	default:
	dev_err(&pdev->dev, "incorrect timeout value (%d)\n",
	pdata->timeout);
	return -EINVAL;
	}
	if (ret < 0) {
	dev_err(&pdev->dev, "Cannot use i2c bus.\n");
	return ret;
	}

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

	platform_set_drvdata(pdev, charger);

	charger->dev = &pdev->dev;
	charger->iodev = iodev;

	psy_cfg.drv_data = charger;

	charger->battery = devm_power_supply_register(&pdev->dev,
	&max8997_battery_desc,
	&psy_cfg);
	if (IS_ERR(charger->battery)) {
	dev_err(&pdev->dev, "failed: power supply register\n");
	return PTR_ERR(charger->battery);
	}

	// grab regulator from parent device's node
	pdev->dev.of_node = iodev->dev->of_node;
	charger->reg = devm_regulator_get_optional(&pdev->dev, "charger");
	pdev->dev.of_node = np;
	if (IS_ERR(charger->reg)) {
	if (PTR_ERR(charger->reg) == -EPROBE_DEFER)
	return -EPROBE_DEFER;
	dev_info(&pdev->dev, "couldn't get charger regulator\n");
	}
	charger->edev = extcon_get_extcon_dev("max8997-muic");
	if (IS_ERR_OR_NULL(charger->edev)) {
	if (!charger->edev)
	return -EPROBE_DEFER;
	dev_info(charger->dev, "couldn't get extcon device\n");
	}

	if (!IS_ERR(charger->reg) && !IS_ERR_OR_NULL(charger->edev)) {
	ret = devm_work_autocancel(&pdev->dev, &charger->extcon_work,
	max8997_battery_extcon_evt_worker);
	if (ret) {
	dev_err(&pdev->dev, "failed to add extcon evt stop action: %d\n", ret);
	return ret;
	}
	charger->extcon_nb.notifier_call = max8997_battery_extcon_evt;
	ret = devm_extcon_register_notifier_all(&pdev->dev, charger->edev,
	&charger->extcon_nb);
	if (ret) {
	dev_err(&pdev->dev, "failed to register extcon notifier\n");
	return ret;
	}
	}

	return 0;
	}

	static const struct platform_device_id max8997_battery_id[] = {
	{ "max8997-battery", 0 },
	{ }
	};
	MODULE_DEVICE_TABLE(platform, max8997_battery_id);

	static struct platform_driver max8997_battery_driver = {
	.driver = {
	.name = "max8997-battery",
	},
	.probe = max8997_battery_probe,
	.id_table = max8997_battery_id,
	};
	module_platform_driver(max8997_battery_driver);

	MODULE_DESCRIPTION("MAXIM 8997/8966 battery control driver");
	MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
	MODULE_LICENSE("GPL");