drivers/power/supply/max8903_charger.c - fs/xfs/xfs-linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * max8903_charger.c - Maxim 8903 USB/Adapter Charger Driver
  *
  * Copyright (C) 2011 Samsung Electronics
  * MyungJoo Ham <myungjoo.ham@samsung.com>
  */

 #include <linux/gpio.h>
 #include <linux/interrupt.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
 #include <linux/of_gpio.h>
 #include <linux/slab.h>
 #include <linux/power_supply.h>
 #include <linux/platform_device.h>
 #include <linux/power/max8903_charger.h>

 struct max8903_data {
 	struct max8903_pdata *pdata;
 	struct device *dev;
 	struct power_supply *psy;
 	struct power_supply_desc psy_desc;
 	bool fault;
 	bool usb_in;
 	bool ta_in;
 };

 static enum power_supply_property max8903_charger_props[] = {
 	POWER_SUPPLY_PROP_STATUS, /* Charger status output */
 	POWER_SUPPLY_PROP_ONLINE, /* External power source */
 	POWER_SUPPLY_PROP_HEALTH, /* Fault or OK */
 };

 static int max8903_get_property(struct power_supply *psy,
 		enum power_supply_property psp,
 		union power_supply_propval *val)
 {
 	struct max8903_data *data = power_supply_get_drvdata(psy);

 	switch (psp) {
 	case POWER_SUPPLY_PROP_STATUS:
 		val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
 		if (gpio_is_valid(data->pdata->chg)) {
 			if (gpio_get_value(data->pdata->chg) == 0)
 				val->intval = POWER_SUPPLY_STATUS_CHARGING;
 			else if (data->usb_in || data->ta_in)
 				val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
 			else
 				val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 		}
 		break;
 	case POWER_SUPPLY_PROP_ONLINE:
 		val->intval = 0;
 		if (data->usb_in || data->ta_in)
 			val->intval = 1;
 		break;
 	case POWER_SUPPLY_PROP_HEALTH:
 		val->intval = POWER_SUPPLY_HEALTH_GOOD;
 		if (data->fault)
 			val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
 		break;
 	default:
 		return -EINVAL;
 	}

 	return 0;
 }

 static irqreturn_t max8903_dcin(int irq, void *_data)
 {
 	struct max8903_data *data = _data;
 	struct max8903_pdata *pdata = data->pdata;
 	bool ta_in;
 	enum power_supply_type old_type;

 	ta_in = gpio_get_value(pdata->dok) ? false : true;

 	if (ta_in == data->ta_in)
 		return IRQ_HANDLED;

 	data->ta_in = ta_in;

 	/* Set Current-Limit-Mode 1:DC 0:USB */
 	if (gpio_is_valid(pdata->dcm))
 		gpio_set_value(pdata->dcm, ta_in ? 1 : 0);

 	/* Charger Enable / Disable (cen is negated) */
 	if (gpio_is_valid(pdata->cen))
 		gpio_set_value(pdata->cen, ta_in ? 0 :
 				(data->usb_in ? 0 : 1));

 	dev_dbg(data->dev, "TA(DC-IN) Charger %s.\n", ta_in ?
 			"Connected" : "Disconnected");

 	old_type = data->psy_desc.type;

 	if (data->ta_in)
 		data->psy_desc.type = POWER_SUPPLY_TYPE_MAINS;
 	else if (data->usb_in)
 		data->psy_desc.type = POWER_SUPPLY_TYPE_USB;
 	else
 		data->psy_desc.type = POWER_SUPPLY_TYPE_BATTERY;

 	if (old_type != data->psy_desc.type)
 		power_supply_changed(data->psy);

 	return IRQ_HANDLED;
 }

 static irqreturn_t max8903_usbin(int irq, void *_data)
 {
 	struct max8903_data *data = _data;
 	struct max8903_pdata *pdata = data->pdata;
 	bool usb_in;
 	enum power_supply_type old_type;

 	usb_in = gpio_get_value(pdata->uok) ? false : true;

 	if (usb_in == data->usb_in)
 		return IRQ_HANDLED;

 	data->usb_in = usb_in;

 	/* Do not touch Current-Limit-Mode */

 	/* Charger Enable / Disable (cen is negated) */
 	if (gpio_is_valid(pdata->cen))
 		gpio_set_value(pdata->cen, usb_in ? 0 :
 				(data->ta_in ? 0 : 1));

 	dev_dbg(data->dev, "USB Charger %s.\n", usb_in ?
 			"Connected" : "Disconnected");

 	old_type = data->psy_desc.type;

 	if (data->ta_in)
 		data->psy_desc.type = POWER_SUPPLY_TYPE_MAINS;
 	else if (data->usb_in)
 		data->psy_desc.type = POWER_SUPPLY_TYPE_USB;
 	else
 		data->psy_desc.type = POWER_SUPPLY_TYPE_BATTERY;

 	if (old_type != data->psy_desc.type)
 		power_supply_changed(data->psy);

 	return IRQ_HANDLED;
 }

 static irqreturn_t max8903_fault(int irq, void *_data)
 {
 	struct max8903_data *data = _data;
 	struct max8903_pdata *pdata = data->pdata;
 	bool fault;

 	fault = gpio_get_value(pdata->flt) ? false : true;

 	if (fault == data->fault)
 		return IRQ_HANDLED;

 	data->fault = fault;

 	if (fault)
 		dev_err(data->dev, "Charger suffers a fault and stops.\n");
 	else
 		dev_err(data->dev, "Charger recovered from a fault.\n");

 	return IRQ_HANDLED;
 }

 static struct max8903_pdata *max8903_parse_dt_data(struct device *dev)
 {
 	struct device_node *np = dev->of_node;
 	struct max8903_pdata *pdata = NULL;

 	if (!np)
 		return NULL;

 	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 	if (!pdata)
 		return NULL;

 	pdata->dc_valid = false;
 	pdata->usb_valid = false;

 	pdata->cen = of_get_named_gpio(np, "cen-gpios", 0);
 	if (!gpio_is_valid(pdata->cen))
 		pdata->cen = -EINVAL;

 	pdata->chg = of_get_named_gpio(np, "chg-gpios", 0);
 	if (!gpio_is_valid(pdata->chg))
 		pdata->chg = -EINVAL;

 	pdata->flt = of_get_named_gpio(np, "flt-gpios", 0);
 	if (!gpio_is_valid(pdata->flt))
 		pdata->flt = -EINVAL;

 	pdata->usus = of_get_named_gpio(np, "usus-gpios", 0);
 	if (!gpio_is_valid(pdata->usus))
 		pdata->usus = -EINVAL;

 	pdata->dcm = of_get_named_gpio(np, "dcm-gpios", 0);
 	if (!gpio_is_valid(pdata->dcm))
 		pdata->dcm = -EINVAL;

 	pdata->dok = of_get_named_gpio(np, "dok-gpios", 0);
 	if (!gpio_is_valid(pdata->dok))
 		pdata->dok = -EINVAL;
 	else
 		pdata->dc_valid = true;

 	pdata->uok = of_get_named_gpio(np, "uok-gpios", 0);
 	if (!gpio_is_valid(pdata->uok))
 		pdata->uok = -EINVAL;
 	else
 		pdata->usb_valid = true;

 	return pdata;
 }

 static int max8903_setup_gpios(struct platform_device *pdev)
 {
 	struct max8903_data *data = platform_get_drvdata(pdev);
 	struct device *dev = &pdev->dev;
 	struct max8903_pdata *pdata = pdev->dev.platform_data;
 	int ret = 0;
 	int gpio;
 	int ta_in = 0;
 	int usb_in = 0;

 	if (pdata->dc_valid) {
 		if (gpio_is_valid(pdata->dok)) {
 			ret = devm_gpio_request(dev, pdata->dok,
 						data->psy_desc.name);
 			if (ret) {
 				dev_err(dev,
 					"Failed GPIO request for dok: %d err %d\n",
 					pdata->dok, ret);
 				return ret;
 			}

 			gpio = pdata->dok; /* PULL_UPed Interrupt */
 			ta_in = gpio_get_value(gpio) ? 0 : 1;
 		} else {
 			dev_err(dev, "When DC is wired, DOK should be wired as well.\n");
 			return -EINVAL;
 		}
 	}

 	if (gpio_is_valid(pdata->dcm)) {
 		ret = devm_gpio_request(dev, pdata->dcm, data->psy_desc.name);
 		if (ret) {
 			dev_err(dev,
 				"Failed GPIO request for dcm: %d err %d\n",
 				pdata->dcm, ret);
 			return ret;
 		}

 		gpio = pdata->dcm; /* Output */
 		gpio_set_value(gpio, ta_in);
 	}

 	if (pdata->usb_valid) {
 		if (gpio_is_valid(pdata->uok)) {
 			ret = devm_gpio_request(dev, pdata->uok,
 						data->psy_desc.name);
 			if (ret) {
 				dev_err(dev,
 					"Failed GPIO request for uok: %d err %d\n",
 					pdata->uok, ret);
 				return ret;
 			}

 			gpio = pdata->uok;
 			usb_in = gpio_get_value(gpio) ? 0 : 1;
 		} else {
 			dev_err(dev, "When USB is wired, UOK should be wired."
 					"as well.\n");
 			return -EINVAL;
 		}
 	}

 	if (gpio_is_valid(pdata->cen)) {
 		ret = devm_gpio_request(dev, pdata->cen, data->psy_desc.name);
 		if (ret) {
 			dev_err(dev,
 				"Failed GPIO request for cen: %d err %d\n",
 				pdata->cen, ret);
 			return ret;
 		}

 		gpio_set_value(pdata->cen, (ta_in || usb_in) ? 0 : 1);
 	}

 	if (gpio_is_valid(pdata->chg)) {
 		ret = devm_gpio_request(dev, pdata->chg, data->psy_desc.name);
 		if (ret) {
 			dev_err(dev,
 				"Failed GPIO request for chg: %d err %d\n",
 				pdata->chg, ret);
 			return ret;
 		}
 	}

 	if (gpio_is_valid(pdata->flt)) {
 		ret = devm_gpio_request(dev, pdata->flt, data->psy_desc.name);
 		if (ret) {
 			dev_err(dev,
 				"Failed GPIO request for flt: %d err %d\n",
 				pdata->flt, ret);
 			return ret;
 		}
 	}

 	if (gpio_is_valid(pdata->usus)) {
 		ret = devm_gpio_request(dev, pdata->usus, data->psy_desc.name);
 		if (ret) {
 			dev_err(dev,
 				"Failed GPIO request for usus: %d err %d\n",
 				pdata->usus, ret);
 			return ret;
 		}
 	}

 	data->fault = false;
 	data->ta_in = ta_in;
 	data->usb_in = usb_in;

 	return 0;
 }

 static int max8903_probe(struct platform_device *pdev)
 {
 	struct max8903_data *data;
 	struct device *dev = &pdev->dev;
 	struct max8903_pdata *pdata = pdev->dev.platform_data;
 	struct power_supply_config psy_cfg = {};
 	int ret = 0;

 	data = devm_kzalloc(dev, sizeof(struct max8903_data), GFP_KERNEL);
 	if (!data)
 		return -ENOMEM;

 	if (IS_ENABLED(CONFIG_OF) && !pdata && dev->of_node)
 		pdata = max8903_parse_dt_data(dev);

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

 	pdev->dev.platform_data = pdata;
 	data->pdata = pdata;
 	data->dev = dev;
 	platform_set_drvdata(pdev, data);

 	if (pdata->dc_valid == false && pdata->usb_valid == false) {
 		dev_err(dev, "No valid power sources.\n");
 		return -EINVAL;
 	}

 	ret = max8903_setup_gpios(pdev);
 	if (ret)
 		return ret;

 	data->psy_desc.name = "max8903_charger";
 	data->psy_desc.type = (data->ta_in) ? POWER_SUPPLY_TYPE_MAINS :
 			((data->usb_in) ? POWER_SUPPLY_TYPE_USB :
 			 POWER_SUPPLY_TYPE_BATTERY);
 	data->psy_desc.get_property = max8903_get_property;
 	data->psy_desc.properties = max8903_charger_props;
 	data->psy_desc.num_properties = ARRAY_SIZE(max8903_charger_props);

 	psy_cfg.of_node = dev->of_node;
 	psy_cfg.drv_data = data;

 	data->psy = devm_power_supply_register(dev, &data->psy_desc, &psy_cfg);
 	if (IS_ERR(data->psy)) {
 		dev_err(dev, "failed: power supply register.\n");
 		return PTR_ERR(data->psy);
 	}

 	if (pdata->dc_valid) {
 		ret = devm_request_threaded_irq(dev, gpio_to_irq(pdata->dok),
 					NULL, max8903_dcin,
 					IRQF_TRIGGER_FALLING |
 					IRQF_TRIGGER_RISING | IRQF_ONESHOT,
 					"MAX8903 DC IN", data);
 		if (ret) {
 			dev_err(dev, "Cannot request irq %d for DC (%d)\n",
 					gpio_to_irq(pdata->dok), ret);
 			return ret;
 		}
 	}

 	if (pdata->usb_valid) {
 		ret = devm_request_threaded_irq(dev, gpio_to_irq(pdata->uok),
 					NULL, max8903_usbin,
 					IRQF_TRIGGER_FALLING |
 					IRQF_TRIGGER_RISING | IRQF_ONESHOT,
 					"MAX8903 USB IN", data);
 		if (ret) {
 			dev_err(dev, "Cannot request irq %d for USB (%d)\n",
 					gpio_to_irq(pdata->uok), ret);
 			return ret;
 		}
 	}

 	if (gpio_is_valid(pdata->flt)) {
 		ret = devm_request_threaded_irq(dev, gpio_to_irq(pdata->flt),
 					NULL, max8903_fault,
 					IRQF_TRIGGER_FALLING |
 					IRQF_TRIGGER_RISING | IRQF_ONESHOT,
 					"MAX8903 Fault", data);
 		if (ret) {
 			dev_err(dev, "Cannot request irq %d for Fault (%d)\n",
 					gpio_to_irq(pdata->flt), ret);
 			return ret;
 		}
 	}

 	return 0;
 }

 static const struct of_device_id max8903_match_ids[] = {
 	{ .compatible = "maxim,max8903", },
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, max8903_match_ids);

 static struct platform_driver max8903_driver = {
 	.probe	= max8903_probe,
 	.driver = {
 		.name	= "max8903-charger",
 		.of_match_table = max8903_match_ids
 	},
 };

 module_platform_driver(max8903_driver);

 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("MAX8903 Charger Driver");
 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
 MODULE_ALIAS("platform:max8903-charger");
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* max8903_charger.c - Maxim 8903 USB/Adapter Charger Driver
	*
	* Copyright (C) 2011 Samsung Electronics
	* MyungJoo Ham <myungjoo.ham@samsung.com>
	*/

	#include <linux/gpio.h>
	#include <linux/interrupt.h>
	#include <linux/module.h>
	#include <linux/of.h>
	#include <linux/of_device.h>
	#include <linux/of_gpio.h>
	#include <linux/slab.h>
	#include <linux/power_supply.h>
	#include <linux/platform_device.h>
	#include <linux/power/max8903_charger.h>

	struct max8903_data {
	struct max8903_pdata *pdata;
	struct device *dev;
	struct power_supply *psy;
	struct power_supply_desc psy_desc;
	bool fault;
	bool usb_in;
	bool ta_in;
	};

	static enum power_supply_property max8903_charger_props[] = {
	POWER_SUPPLY_PROP_STATUS, /* Charger status output */
	POWER_SUPPLY_PROP_ONLINE, /* External power source */
	POWER_SUPPLY_PROP_HEALTH, /* Fault or OK */
	};

	static int max8903_get_property(struct power_supply *psy,
	enum power_supply_property psp,
	union power_supply_propval *val)
	{
	struct max8903_data *data = power_supply_get_drvdata(psy);

	switch (psp) {
	case POWER_SUPPLY_PROP_STATUS:
	val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
	if (gpio_is_valid(data->pdata->chg)) {
	if (gpio_get_value(data->pdata->chg) == 0)
	val->intval = POWER_SUPPLY_STATUS_CHARGING;
	else if (data->usb_in \|\| data->ta_in)
	val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
	else
	val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
	}
	break;
	case POWER_SUPPLY_PROP_ONLINE:
	val->intval = 0;
	if (data->usb_in \|\| data->ta_in)
	val->intval = 1;
	break;
	case POWER_SUPPLY_PROP_HEALTH:
	val->intval = POWER_SUPPLY_HEALTH_GOOD;
	if (data->fault)
	val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
	break;
	default:
	return -EINVAL;
	}

	return 0;
	}

	static irqreturn_t max8903_dcin(int irq, void *_data)
	{
	struct max8903_data *data = _data;
	struct max8903_pdata *pdata = data->pdata;
	bool ta_in;
	enum power_supply_type old_type;

	ta_in = gpio_get_value(pdata->dok) ? false : true;

	if (ta_in == data->ta_in)
	return IRQ_HANDLED;

	data->ta_in = ta_in;

	/* Set Current-Limit-Mode 1:DC 0:USB */
	if (gpio_is_valid(pdata->dcm))
	gpio_set_value(pdata->dcm, ta_in ? 1 : 0);

	/* Charger Enable / Disable (cen is negated) */
	if (gpio_is_valid(pdata->cen))
	gpio_set_value(pdata->cen, ta_in ? 0 :
	(data->usb_in ? 0 : 1));

	dev_dbg(data->dev, "TA(DC-IN) Charger %s.\n", ta_in ?
	"Connected" : "Disconnected");

	old_type = data->psy_desc.type;

	if (data->ta_in)
	data->psy_desc.type = POWER_SUPPLY_TYPE_MAINS;
	else if (data->usb_in)
	data->psy_desc.type = POWER_SUPPLY_TYPE_USB;
	else
	data->psy_desc.type = POWER_SUPPLY_TYPE_BATTERY;

	if (old_type != data->psy_desc.type)
	power_supply_changed(data->psy);

	return IRQ_HANDLED;
	}

	static irqreturn_t max8903_usbin(int irq, void *_data)
	{
	struct max8903_data *data = _data;
	struct max8903_pdata *pdata = data->pdata;
	bool usb_in;
	enum power_supply_type old_type;

	usb_in = gpio_get_value(pdata->uok) ? false : true;

	if (usb_in == data->usb_in)
	return IRQ_HANDLED;

	data->usb_in = usb_in;

	/* Do not touch Current-Limit-Mode */

	/* Charger Enable / Disable (cen is negated) */
	if (gpio_is_valid(pdata->cen))
	gpio_set_value(pdata->cen, usb_in ? 0 :
	(data->ta_in ? 0 : 1));

	dev_dbg(data->dev, "USB Charger %s.\n", usb_in ?
	"Connected" : "Disconnected");

	old_type = data->psy_desc.type;

	if (data->ta_in)
	data->psy_desc.type = POWER_SUPPLY_TYPE_MAINS;
	else if (data->usb_in)
	data->psy_desc.type = POWER_SUPPLY_TYPE_USB;
	else
	data->psy_desc.type = POWER_SUPPLY_TYPE_BATTERY;

	if (old_type != data->psy_desc.type)
	power_supply_changed(data->psy);

	return IRQ_HANDLED;
	}

	static irqreturn_t max8903_fault(int irq, void *_data)
	{
	struct max8903_data *data = _data;
	struct max8903_pdata *pdata = data->pdata;
	bool fault;

	fault = gpio_get_value(pdata->flt) ? false : true;

	if (fault == data->fault)
	return IRQ_HANDLED;

	data->fault = fault;

	if (fault)
	dev_err(data->dev, "Charger suffers a fault and stops.\n");
	else
	dev_err(data->dev, "Charger recovered from a fault.\n");

	return IRQ_HANDLED;
	}

	static struct max8903_pdata max8903_parse_dt_data(struct device dev)
	{
	struct device_node *np = dev->of_node;
	struct max8903_pdata *pdata = NULL;

	if (!np)
	return NULL;

	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
	if (!pdata)
	return NULL;

	pdata->dc_valid = false;
	pdata->usb_valid = false;

	pdata->cen = of_get_named_gpio(np, "cen-gpios", 0);
	if (!gpio_is_valid(pdata->cen))
	pdata->cen = -EINVAL;

	pdata->chg = of_get_named_gpio(np, "chg-gpios", 0);
	if (!gpio_is_valid(pdata->chg))
	pdata->chg = -EINVAL;

	pdata->flt = of_get_named_gpio(np, "flt-gpios", 0);
	if (!gpio_is_valid(pdata->flt))
	pdata->flt = -EINVAL;

	pdata->usus = of_get_named_gpio(np, "usus-gpios", 0);
	if (!gpio_is_valid(pdata->usus))
	pdata->usus = -EINVAL;

	pdata->dcm = of_get_named_gpio(np, "dcm-gpios", 0);
	if (!gpio_is_valid(pdata->dcm))
	pdata->dcm = -EINVAL;

	pdata->dok = of_get_named_gpio(np, "dok-gpios", 0);
	if (!gpio_is_valid(pdata->dok))
	pdata->dok = -EINVAL;
	else
	pdata->dc_valid = true;

	pdata->uok = of_get_named_gpio(np, "uok-gpios", 0);
	if (!gpio_is_valid(pdata->uok))
	pdata->uok = -EINVAL;
	else
	pdata->usb_valid = true;

	return pdata;
	}

	static int max8903_setup_gpios(struct platform_device *pdev)
	{
	struct max8903_data *data = platform_get_drvdata(pdev);
	struct device *dev = &pdev->dev;
	struct max8903_pdata *pdata = pdev->dev.platform_data;
	int ret = 0;
	int gpio;
	int ta_in = 0;
	int usb_in = 0;

	if (pdata->dc_valid) {
	if (gpio_is_valid(pdata->dok)) {
	ret = devm_gpio_request(dev, pdata->dok,
	data->psy_desc.name);
	if (ret) {
	dev_err(dev,
	"Failed GPIO request for dok: %d err %d\n",
	pdata->dok, ret);
	return ret;
	}

	gpio = pdata->dok; /* PULL_UPed Interrupt */
	ta_in = gpio_get_value(gpio) ? 0 : 1;
	} else {
	dev_err(dev, "When DC is wired, DOK should be wired as well.\n");
	return -EINVAL;
	}
	}

	if (gpio_is_valid(pdata->dcm)) {
	ret = devm_gpio_request(dev, pdata->dcm, data->psy_desc.name);
	if (ret) {
	dev_err(dev,
	"Failed GPIO request for dcm: %d err %d\n",
	pdata->dcm, ret);
	return ret;
	}

	gpio = pdata->dcm; /* Output */
	gpio_set_value(gpio, ta_in);
	}

	if (pdata->usb_valid) {
	if (gpio_is_valid(pdata->uok)) {
	ret = devm_gpio_request(dev, pdata->uok,
	data->psy_desc.name);
	if (ret) {
	dev_err(dev,
	"Failed GPIO request for uok: %d err %d\n",
	pdata->uok, ret);
	return ret;
	}

	gpio = pdata->uok;
	usb_in = gpio_get_value(gpio) ? 0 : 1;
	} else {
	dev_err(dev, "When USB is wired, UOK should be wired."
	"as well.\n");
	return -EINVAL;
	}
	}

	if (gpio_is_valid(pdata->cen)) {
	ret = devm_gpio_request(dev, pdata->cen, data->psy_desc.name);
	if (ret) {
	dev_err(dev,
	"Failed GPIO request for cen: %d err %d\n",
	pdata->cen, ret);
	return ret;
	}

	gpio_set_value(pdata->cen, (ta_in \|\| usb_in) ? 0 : 1);
	}

	if (gpio_is_valid(pdata->chg)) {
	ret = devm_gpio_request(dev, pdata->chg, data->psy_desc.name);
	if (ret) {
	dev_err(dev,
	"Failed GPIO request for chg: %d err %d\n",
	pdata->chg, ret);
	return ret;
	}
	}

	if (gpio_is_valid(pdata->flt)) {
	ret = devm_gpio_request(dev, pdata->flt, data->psy_desc.name);
	if (ret) {
	dev_err(dev,
	"Failed GPIO request for flt: %d err %d\n",
	pdata->flt, ret);
	return ret;
	}
	}

	if (gpio_is_valid(pdata->usus)) {
	ret = devm_gpio_request(dev, pdata->usus, data->psy_desc.name);
	if (ret) {
	dev_err(dev,
	"Failed GPIO request for usus: %d err %d\n",
	pdata->usus, ret);
	return ret;
	}
	}

	data->fault = false;
	data->ta_in = ta_in;
	data->usb_in = usb_in;

	return 0;
	}

	static int max8903_probe(struct platform_device *pdev)
	{
	struct max8903_data *data;
	struct device *dev = &pdev->dev;
	struct max8903_pdata *pdata = pdev->dev.platform_data;
	struct power_supply_config psy_cfg = {};
	int ret = 0;

	data = devm_kzalloc(dev, sizeof(struct max8903_data), GFP_KERNEL);
	if (!data)
	return -ENOMEM;

	if (IS_ENABLED(CONFIG_OF) && !pdata && dev->of_node)
	pdata = max8903_parse_dt_data(dev);

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

	pdev->dev.platform_data = pdata;
	data->pdata = pdata;
	data->dev = dev;
	platform_set_drvdata(pdev, data);

	if (pdata->dc_valid == false && pdata->usb_valid == false) {
	dev_err(dev, "No valid power sources.\n");
	return -EINVAL;
	}

	ret = max8903_setup_gpios(pdev);
	if (ret)
	return ret;

	data->psy_desc.name = "max8903_charger";
	data->psy_desc.type = (data->ta_in) ? POWER_SUPPLY_TYPE_MAINS :
	((data->usb_in) ? POWER_SUPPLY_TYPE_USB :
	POWER_SUPPLY_TYPE_BATTERY);
	data->psy_desc.get_property = max8903_get_property;
	data->psy_desc.properties = max8903_charger_props;
	data->psy_desc.num_properties = ARRAY_SIZE(max8903_charger_props);

	psy_cfg.of_node = dev->of_node;
	psy_cfg.drv_data = data;

	data->psy = devm_power_supply_register(dev, &data->psy_desc, &psy_cfg);
	if (IS_ERR(data->psy)) {
	dev_err(dev, "failed: power supply register.\n");
	return PTR_ERR(data->psy);
	}

	if (pdata->dc_valid) {
	ret = devm_request_threaded_irq(dev, gpio_to_irq(pdata->dok),
	NULL, max8903_dcin,
	IRQF_TRIGGER_FALLING \|
	IRQF_TRIGGER_RISING \| IRQF_ONESHOT,
	"MAX8903 DC IN", data);
	if (ret) {
	dev_err(dev, "Cannot request irq %d for DC (%d)\n",
	gpio_to_irq(pdata->dok), ret);
	return ret;
	}
	}

	if (pdata->usb_valid) {
	ret = devm_request_threaded_irq(dev, gpio_to_irq(pdata->uok),
	NULL, max8903_usbin,
	IRQF_TRIGGER_FALLING \|
	IRQF_TRIGGER_RISING \| IRQF_ONESHOT,
	"MAX8903 USB IN", data);
	if (ret) {
	dev_err(dev, "Cannot request irq %d for USB (%d)\n",
	gpio_to_irq(pdata->uok), ret);
	return ret;
	}
	}

	if (gpio_is_valid(pdata->flt)) {
	ret = devm_request_threaded_irq(dev, gpio_to_irq(pdata->flt),
	NULL, max8903_fault,
	IRQF_TRIGGER_FALLING \|
	IRQF_TRIGGER_RISING \| IRQF_ONESHOT,
	"MAX8903 Fault", data);
	if (ret) {
	dev_err(dev, "Cannot request irq %d for Fault (%d)\n",
	gpio_to_irq(pdata->flt), ret);
	return ret;
	}
	}

	return 0;
	}

	static const struct of_device_id max8903_match_ids[] = {
	{ .compatible = "maxim,max8903", },
	{ /* sentinel */ }
	};
	MODULE_DEVICE_TABLE(of, max8903_match_ids);

	static struct platform_driver max8903_driver = {
	.probe = max8903_probe,
	.driver = {
	.name = "max8903-charger",
	.of_match_table = max8903_match_ids
	},
	};

	module_platform_driver(max8903_driver);

	MODULE_LICENSE("GPL");
	MODULE_DESCRIPTION("MAX8903 Charger Driver");
	MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
	MODULE_ALIAS("platform:max8903-charger");