drivers/power/supply/gpio-charger.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *  Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
  *  Driver for chargers which report their online status through a GPIO pin
  */

 #include <linux/device.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/power_supply.h>
 #include <linux/slab.h>
 #include <linux/of.h>
 #include <linux/gpio/consumer.h>

 #include <linux/power/gpio-charger.h>

 struct gpio_mapping {
 	u32 limit_ua;
 	u32 gpiodata;
 } __packed;

 struct gpio_charger {
 	struct device *dev;
 	unsigned int irq;
 	unsigned int charge_status_irq;
 	bool wakeup_enabled;

 	struct power_supply *charger;
 	struct power_supply_desc charger_desc;
 	struct gpio_desc *gpiod;
 	struct gpio_desc *charge_status;

 	struct gpio_descs *current_limit_gpios;
 	struct gpio_mapping *current_limit_map;
 	u32 current_limit_map_size;
 	u32 charge_current_limit;
 };

 static irqreturn_t gpio_charger_irq(int irq, void *devid)
 {
 	struct power_supply *charger = devid;

 	power_supply_changed(charger);

 	return IRQ_HANDLED;
 }

 static inline struct gpio_charger *psy_to_gpio_charger(struct power_supply *psy)
 {
 	return power_supply_get_drvdata(psy);
 }

 static int set_charge_current_limit(struct gpio_charger *gpio_charger, int val)
 {
 	struct gpio_mapping mapping;
 	int ndescs = gpio_charger->current_limit_gpios->ndescs;
 	struct gpio_desc **gpios = gpio_charger->current_limit_gpios->desc;
 	int i;

 	if (!gpio_charger->current_limit_map_size)
 		return -EINVAL;

 	for (i = 0; i < gpio_charger->current_limit_map_size; i++) {
 		if (gpio_charger->current_limit_map[i].limit_ua <= val)
 			break;
 	}
 	mapping = gpio_charger->current_limit_map[i];

 	for (i = 0; i < ndescs; i++) {
 		bool val = (mapping.gpiodata >> i) & 1;
 		gpiod_set_value_cansleep(gpios[ndescs-i-1], val);
 	}

 	gpio_charger->charge_current_limit = mapping.limit_ua;

 	dev_dbg(gpio_charger->dev, "set charge current limit to %d (requested: %d)\n",
 		gpio_charger->charge_current_limit, val);

 	return 0;
 }

 static int gpio_charger_get_property(struct power_supply *psy,
 		enum power_supply_property psp, union power_supply_propval *val)
 {
 	struct gpio_charger *gpio_charger = psy_to_gpio_charger(psy);

 	switch (psp) {
 	case POWER_SUPPLY_PROP_ONLINE:
 		val->intval = gpiod_get_value_cansleep(gpio_charger->gpiod);
 		break;
 	case POWER_SUPPLY_PROP_STATUS:
 		if (gpiod_get_value_cansleep(gpio_charger->charge_status))
 			val->intval = POWER_SUPPLY_STATUS_CHARGING;
 		else
 			val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
 		break;
 	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
 		val->intval = gpio_charger->charge_current_limit;
 		break;
 	default:
 		return -EINVAL;
 	}

 	return 0;
 }

 static int gpio_charger_set_property(struct power_supply *psy,
 	enum power_supply_property psp, const union power_supply_propval *val)
 {
 	struct gpio_charger *gpio_charger = psy_to_gpio_charger(psy);

 	switch (psp) {
 	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
 		return set_charge_current_limit(gpio_charger, val->intval);
 	default:
 		return -EINVAL;
 	}

 	return 0;
 }

 static int gpio_charger_property_is_writeable(struct power_supply *psy,
 					      enum power_supply_property psp)
 {
 	switch (psp) {
 	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
 		return 1;
 	default:
 		break;
 	}

 	return 0;
 }

 static enum power_supply_type gpio_charger_get_type(struct device *dev)
 {
 	const char *chargetype;

 	if (!device_property_read_string(dev, "charger-type", &chargetype)) {
 		if (!strcmp("unknown", chargetype))
 			return POWER_SUPPLY_TYPE_UNKNOWN;
 		if (!strcmp("battery", chargetype))
 			return POWER_SUPPLY_TYPE_BATTERY;
 		if (!strcmp("ups", chargetype))
 			return POWER_SUPPLY_TYPE_UPS;
 		if (!strcmp("mains", chargetype))
 			return POWER_SUPPLY_TYPE_MAINS;
 		if (!strcmp("usb-sdp", chargetype))
 			return POWER_SUPPLY_TYPE_USB;
 		if (!strcmp("usb-dcp", chargetype))
 			return POWER_SUPPLY_TYPE_USB;
 		if (!strcmp("usb-cdp", chargetype))
 			return POWER_SUPPLY_TYPE_USB;
 		if (!strcmp("usb-aca", chargetype))
 			return POWER_SUPPLY_TYPE_USB;
 	}
 	dev_warn(dev, "unknown charger type %s\n", chargetype);

 	return POWER_SUPPLY_TYPE_UNKNOWN;
 }

 static int gpio_charger_get_irq(struct device *dev, void *dev_id,
 				struct gpio_desc *gpio)
 {
 	int ret, irq = gpiod_to_irq(gpio);

 	if (irq > 0) {
 		ret = devm_request_any_context_irq(dev, irq, gpio_charger_irq,
 						   IRQF_TRIGGER_RISING |
 						   IRQF_TRIGGER_FALLING,
 						   dev_name(dev),
 						   dev_id);
 		if (ret < 0) {
 			dev_warn(dev, "Failed to request irq: %d\n", ret);
 			irq = 0;
 		}
 	}

 	return irq;
 }

 static int init_charge_current_limit(struct device *dev,
 				    struct gpio_charger *gpio_charger)
 {
 	int i, len;
 	u32 cur_limit = U32_MAX;

 	gpio_charger->current_limit_gpios = devm_gpiod_get_array_optional(dev,
 		"charge-current-limit", GPIOD_OUT_LOW);
 	if (IS_ERR(gpio_charger->current_limit_gpios)) {
 		dev_err(dev, "error getting current-limit GPIOs\n");
 		return PTR_ERR(gpio_charger->current_limit_gpios);
 	}

 	if (!gpio_charger->current_limit_gpios)
 		return 0;

 	len = device_property_read_u32_array(dev, "charge-current-limit-mapping",
 		NULL, 0);
 	if (len < 0)
 		return len;

 	if (len == 0 || len % 2) {
 		dev_err(dev, "invalid charge-current-limit-mapping length\n");
 		return -EINVAL;
 	}

 	gpio_charger->current_limit_map = devm_kmalloc_array(dev,
 		len / 2, sizeof(*gpio_charger->current_limit_map), GFP_KERNEL);
 	if (!gpio_charger->current_limit_map)
 		return -ENOMEM;

 	gpio_charger->current_limit_map_size = len / 2;

 	len = device_property_read_u32_array(dev, "charge-current-limit-mapping",
 		(u32*) gpio_charger->current_limit_map, len);
 	if (len < 0)
 		return len;

 	for (i=0; i < gpio_charger->current_limit_map_size; i++) {
 		if (gpio_charger->current_limit_map[i].limit_ua > cur_limit) {
 			dev_err(dev, "charge-current-limit-mapping not sorted by current in descending order\n");
 			return -EINVAL;
 		}

 		cur_limit = gpio_charger->current_limit_map[i].limit_ua;
 	}

 	/* default to smallest current limitation for safety reasons */
 	len = gpio_charger->current_limit_map_size - 1;
 	set_charge_current_limit(gpio_charger,
 		gpio_charger->current_limit_map[len].limit_ua);

 	return 0;
 }

 /*
  * The entries will be overwritten by driver's probe routine depending
  * on the available features. This list ensures, that the array is big
  * enough for all optional features.
  */
 static enum power_supply_property gpio_charger_properties[] = {
 	POWER_SUPPLY_PROP_ONLINE,
 	POWER_SUPPLY_PROP_STATUS,
 	POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
 };

 static int gpio_charger_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	const struct gpio_charger_platform_data *pdata = dev->platform_data;
 	struct power_supply_config psy_cfg = {};
 	struct gpio_charger *gpio_charger;
 	struct power_supply_desc *charger_desc;
 	struct gpio_desc *charge_status;
 	int charge_status_irq;
 	int ret;
 	int num_props = 0;

 	if (!pdata && !dev->of_node) {
 		dev_err(dev, "No platform data\n");
 		return -ENOENT;
 	}

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

 	/*
 	 * This will fetch a GPIO descriptor from device tree, ACPI or
 	 * boardfile descriptor tables. It's good to try this first.
 	 */
 	gpio_charger->gpiod = devm_gpiod_get_optional(dev, NULL, GPIOD_IN);
 	if (IS_ERR(gpio_charger->gpiod)) {
 		/* Just try again if this happens */
 		return dev_err_probe(dev, PTR_ERR(gpio_charger->gpiod),
 				     "error getting GPIO descriptor\n");
 	}

 	if (gpio_charger->gpiod) {
 		gpio_charger_properties[num_props] = POWER_SUPPLY_PROP_ONLINE;
 		num_props++;
 	}

 	charge_status = devm_gpiod_get_optional(dev, "charge-status", GPIOD_IN);
 	if (IS_ERR(charge_status))
 		return PTR_ERR(charge_status);
 	if (charge_status) {
 		gpio_charger->charge_status = charge_status;
 		gpio_charger_properties[num_props] = POWER_SUPPLY_PROP_STATUS;
 		num_props++;
 	}

 	ret = init_charge_current_limit(dev, gpio_charger);
 	if (ret < 0)
 		return ret;
 	if (gpio_charger->current_limit_map) {
 		gpio_charger_properties[num_props] =
 			POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX;
 		num_props++;
 	}

 	charger_desc = &gpio_charger->charger_desc;
 	charger_desc->properties = gpio_charger_properties;
 	charger_desc->num_properties = num_props;
 	charger_desc->get_property = gpio_charger_get_property;
 	charger_desc->set_property = gpio_charger_set_property;
 	charger_desc->property_is_writeable =
 					gpio_charger_property_is_writeable;

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

 	if (pdata) {
 		charger_desc->name = pdata->name;
 		charger_desc->type = pdata->type;
 		psy_cfg.supplied_to = pdata->supplied_to;
 		psy_cfg.num_supplicants = pdata->num_supplicants;
 	} else {
 		charger_desc->name = dev->of_node->name;
 		charger_desc->type = gpio_charger_get_type(dev);
 	}

 	if (!charger_desc->name)
 		charger_desc->name = pdev->name;

 	gpio_charger->charger = devm_power_supply_register(dev, charger_desc,
 							   &psy_cfg);
 	if (IS_ERR(gpio_charger->charger)) {
 		ret = PTR_ERR(gpio_charger->charger);
 		dev_err(dev, "Failed to register power supply: %d\n", ret);
 		return ret;
 	}

 	gpio_charger->irq = gpio_charger_get_irq(dev, gpio_charger->charger,
 						 gpio_charger->gpiod);

 	charge_status_irq = gpio_charger_get_irq(dev, gpio_charger->charger,
 						 gpio_charger->charge_status);
 	gpio_charger->charge_status_irq = charge_status_irq;

 	platform_set_drvdata(pdev, gpio_charger);

 	device_init_wakeup(dev, 1);

 	return 0;
 }

 #ifdef CONFIG_PM_SLEEP
 static int gpio_charger_suspend(struct device *dev)
 {
 	struct gpio_charger *gpio_charger = dev_get_drvdata(dev);

 	if (device_may_wakeup(dev))
 		gpio_charger->wakeup_enabled =
 			!enable_irq_wake(gpio_charger->irq);

 	return 0;
 }

 static int gpio_charger_resume(struct device *dev)
 {
 	struct gpio_charger *gpio_charger = dev_get_drvdata(dev);

 	if (device_may_wakeup(dev) && gpio_charger->wakeup_enabled)
 		disable_irq_wake(gpio_charger->irq);
 	power_supply_changed(gpio_charger->charger);

 	return 0;
 }
 #endif

 static SIMPLE_DEV_PM_OPS(gpio_charger_pm_ops,
 		gpio_charger_suspend, gpio_charger_resume);

 static const struct of_device_id gpio_charger_match[] = {
 	{ .compatible = "gpio-charger" },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, gpio_charger_match);

 static struct platform_driver gpio_charger_driver = {
 	.probe = gpio_charger_probe,
 	.driver = {
 		.name = "gpio-charger",
 		.pm = &gpio_charger_pm_ops,
 		.of_match_table = gpio_charger_match,
 	},
 };

 module_platform_driver(gpio_charger_driver);

 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
 MODULE_DESCRIPTION("Driver for chargers only communicating via GPIO(s)");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:gpio-charger");
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
	* Driver for chargers which report their online status through a GPIO pin
	*/

	#include <linux/device.h>
	#include <linux/init.h>
	#include <linux/interrupt.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/platform_device.h>
	#include <linux/power_supply.h>
	#include <linux/slab.h>
	#include <linux/of.h>
	#include <linux/gpio/consumer.h>

	#include <linux/power/gpio-charger.h>

	struct gpio_mapping {
	u32 limit_ua;
	u32 gpiodata;
	} __packed;

	struct gpio_charger {
	struct device *dev;
	unsigned int irq;
	unsigned int charge_status_irq;
	bool wakeup_enabled;

	struct power_supply *charger;
	struct power_supply_desc charger_desc;
	struct gpio_desc *gpiod;
	struct gpio_desc *charge_status;

	struct gpio_descs *current_limit_gpios;
	struct gpio_mapping *current_limit_map;
	u32 current_limit_map_size;
	u32 charge_current_limit;
	};

	static irqreturn_t gpio_charger_irq(int irq, void *devid)
	{
	struct power_supply *charger = devid;

	power_supply_changed(charger);

	return IRQ_HANDLED;
	}

	static inline struct gpio_charger psy_to_gpio_charger(struct power_supply psy)
	{
	return power_supply_get_drvdata(psy);
	}

	static int set_charge_current_limit(struct gpio_charger *gpio_charger, int val)
	{
	struct gpio_mapping mapping;
	int ndescs = gpio_charger->current_limit_gpios->ndescs;
	struct gpio_desc **gpios = gpio_charger->current_limit_gpios->desc;
	int i;

	if (!gpio_charger->current_limit_map_size)
	return -EINVAL;

	for (i = 0; i < gpio_charger->current_limit_map_size; i++) {
	if (gpio_charger->current_limit_map[i].limit_ua <= val)
	break;
	}
	mapping = gpio_charger->current_limit_map[i];

	for (i = 0; i < ndescs; i++) {
	bool val = (mapping.gpiodata >> i) & 1;
	gpiod_set_value_cansleep(gpios[ndescs-i-1], val);
	}

	gpio_charger->charge_current_limit = mapping.limit_ua;

	dev_dbg(gpio_charger->dev, "set charge current limit to %d (requested: %d)\n",
	gpio_charger->charge_current_limit, val);

	return 0;
	}

	static int gpio_charger_get_property(struct power_supply *psy,
	enum power_supply_property psp, union power_supply_propval *val)
	{
	struct gpio_charger *gpio_charger = psy_to_gpio_charger(psy);

	switch (psp) {
	case POWER_SUPPLY_PROP_ONLINE:
	val->intval = gpiod_get_value_cansleep(gpio_charger->gpiod);
	break;
	case POWER_SUPPLY_PROP_STATUS:
	if (gpiod_get_value_cansleep(gpio_charger->charge_status))
	val->intval = POWER_SUPPLY_STATUS_CHARGING;
	else
	val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
	break;
	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
	val->intval = gpio_charger->charge_current_limit;
	break;
	default:
	return -EINVAL;
	}

	return 0;
	}

	static int gpio_charger_set_property(struct power_supply *psy,
	enum power_supply_property psp, const union power_supply_propval *val)
	{
	struct gpio_charger *gpio_charger = psy_to_gpio_charger(psy);

	switch (psp) {
	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
	return set_charge_current_limit(gpio_charger, val->intval);
	default:
	return -EINVAL;
	}

	return 0;
	}

	static int gpio_charger_property_is_writeable(struct power_supply *psy,
	enum power_supply_property psp)
	{
	switch (psp) {
	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
	return 1;
	default:
	break;
	}

	return 0;
	}

	static enum power_supply_type gpio_charger_get_type(struct device *dev)
	{
	const char *chargetype;

	if (!device_property_read_string(dev, "charger-type", &chargetype)) {
	if (!strcmp("unknown", chargetype))
	return POWER_SUPPLY_TYPE_UNKNOWN;
	if (!strcmp("battery", chargetype))
	return POWER_SUPPLY_TYPE_BATTERY;
	if (!strcmp("ups", chargetype))
	return POWER_SUPPLY_TYPE_UPS;
	if (!strcmp("mains", chargetype))
	return POWER_SUPPLY_TYPE_MAINS;
	if (!strcmp("usb-sdp", chargetype))
	return POWER_SUPPLY_TYPE_USB;
	if (!strcmp("usb-dcp", chargetype))
	return POWER_SUPPLY_TYPE_USB;
	if (!strcmp("usb-cdp", chargetype))
	return POWER_SUPPLY_TYPE_USB;
	if (!strcmp("usb-aca", chargetype))
	return POWER_SUPPLY_TYPE_USB;
	}
	dev_warn(dev, "unknown charger type %s\n", chargetype);

	return POWER_SUPPLY_TYPE_UNKNOWN;
	}

	static int gpio_charger_get_irq(struct device dev, void dev_id,
	struct gpio_desc *gpio)
	{
	int ret, irq = gpiod_to_irq(gpio);

	if (irq > 0) {
	ret = devm_request_any_context_irq(dev, irq, gpio_charger_irq,
	IRQF_TRIGGER_RISING \|
	IRQF_TRIGGER_FALLING,
	dev_name(dev),
	dev_id);
	if (ret < 0) {
	dev_warn(dev, "Failed to request irq: %d\n", ret);
	irq = 0;
	}
	}

	return irq;
	}

	static int init_charge_current_limit(struct device *dev,
	struct gpio_charger *gpio_charger)
	{
	int i, len;
	u32 cur_limit = U32_MAX;

	gpio_charger->current_limit_gpios = devm_gpiod_get_array_optional(dev,
	"charge-current-limit", GPIOD_OUT_LOW);
	if (IS_ERR(gpio_charger->current_limit_gpios)) {
	dev_err(dev, "error getting current-limit GPIOs\n");
	return PTR_ERR(gpio_charger->current_limit_gpios);
	}

	if (!gpio_charger->current_limit_gpios)
	return 0;

	len = device_property_read_u32_array(dev, "charge-current-limit-mapping",
	NULL, 0);
	if (len < 0)
	return len;

	if (len == 0 \|\| len % 2) {
	dev_err(dev, "invalid charge-current-limit-mapping length\n");
	return -EINVAL;
	}

	gpio_charger->current_limit_map = devm_kmalloc_array(dev,
	len / 2, sizeof(*gpio_charger->current_limit_map), GFP_KERNEL);
	if (!gpio_charger->current_limit_map)
	return -ENOMEM;

	gpio_charger->current_limit_map_size = len / 2;

	len = device_property_read_u32_array(dev, "charge-current-limit-mapping",
	(u32*) gpio_charger->current_limit_map, len);
	if (len < 0)
	return len;

	for (i=0; i < gpio_charger->current_limit_map_size; i++) {
	if (gpio_charger->current_limit_map[i].limit_ua > cur_limit) {
	dev_err(dev, "charge-current-limit-mapping not sorted by current in descending order\n");
	return -EINVAL;
	}

	cur_limit = gpio_charger->current_limit_map[i].limit_ua;
	}

	/* default to smallest current limitation for safety reasons */
	len = gpio_charger->current_limit_map_size - 1;
	set_charge_current_limit(gpio_charger,
	gpio_charger->current_limit_map[len].limit_ua);

	return 0;
	}

	/*
	* The entries will be overwritten by driver's probe routine depending
	* on the available features. This list ensures, that the array is big
	* enough for all optional features.
	*/
	static enum power_supply_property gpio_charger_properties[] = {
	POWER_SUPPLY_PROP_ONLINE,
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
	};

	static int gpio_charger_probe(struct platform_device *pdev)
	{
	struct device *dev = &pdev->dev;
	const struct gpio_charger_platform_data *pdata = dev->platform_data;
	struct power_supply_config psy_cfg = {};
	struct gpio_charger *gpio_charger;
	struct power_supply_desc *charger_desc;
	struct gpio_desc *charge_status;
	int charge_status_irq;
	int ret;
	int num_props = 0;

	if (!pdata && !dev->of_node) {
	dev_err(dev, "No platform data\n");
	return -ENOENT;
	}

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

	/*
	* This will fetch a GPIO descriptor from device tree, ACPI or
	* boardfile descriptor tables. It's good to try this first.
	*/
	gpio_charger->gpiod = devm_gpiod_get_optional(dev, NULL, GPIOD_IN);
	if (IS_ERR(gpio_charger->gpiod)) {
	/* Just try again if this happens */
	return dev_err_probe(dev, PTR_ERR(gpio_charger->gpiod),
	"error getting GPIO descriptor\n");
	}

	if (gpio_charger->gpiod) {
	gpio_charger_properties[num_props] = POWER_SUPPLY_PROP_ONLINE;
	num_props++;
	}

	charge_status = devm_gpiod_get_optional(dev, "charge-status", GPIOD_IN);
	if (IS_ERR(charge_status))
	return PTR_ERR(charge_status);
	if (charge_status) {
	gpio_charger->charge_status = charge_status;
	gpio_charger_properties[num_props] = POWER_SUPPLY_PROP_STATUS;
	num_props++;
	}

	ret = init_charge_current_limit(dev, gpio_charger);
	if (ret < 0)
	return ret;
	if (gpio_charger->current_limit_map) {
	gpio_charger_properties[num_props] =
	POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX;
	num_props++;
	}

	charger_desc = &gpio_charger->charger_desc;
	charger_desc->properties = gpio_charger_properties;
	charger_desc->num_properties = num_props;
	charger_desc->get_property = gpio_charger_get_property;
	charger_desc->set_property = gpio_charger_set_property;
	charger_desc->property_is_writeable =
	gpio_charger_property_is_writeable;

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

	if (pdata) {
	charger_desc->name = pdata->name;
	charger_desc->type = pdata->type;
	psy_cfg.supplied_to = pdata->supplied_to;
	psy_cfg.num_supplicants = pdata->num_supplicants;
	} else {
	charger_desc->name = dev->of_node->name;
	charger_desc->type = gpio_charger_get_type(dev);
	}

	if (!charger_desc->name)
	charger_desc->name = pdev->name;

	gpio_charger->charger = devm_power_supply_register(dev, charger_desc,
	&psy_cfg);
	if (IS_ERR(gpio_charger->charger)) {
	ret = PTR_ERR(gpio_charger->charger);
	dev_err(dev, "Failed to register power supply: %d\n", ret);
	return ret;
	}

	gpio_charger->irq = gpio_charger_get_irq(dev, gpio_charger->charger,
	gpio_charger->gpiod);

	charge_status_irq = gpio_charger_get_irq(dev, gpio_charger->charger,
	gpio_charger->charge_status);
	gpio_charger->charge_status_irq = charge_status_irq;

	platform_set_drvdata(pdev, gpio_charger);

	device_init_wakeup(dev, 1);

	return 0;
	}

	#ifdef CONFIG_PM_SLEEP
	static int gpio_charger_suspend(struct device *dev)
	{
	struct gpio_charger *gpio_charger = dev_get_drvdata(dev);

	if (device_may_wakeup(dev))
	gpio_charger->wakeup_enabled =
	!enable_irq_wake(gpio_charger->irq);

	return 0;
	}

	static int gpio_charger_resume(struct device *dev)
	{
	struct gpio_charger *gpio_charger = dev_get_drvdata(dev);

	if (device_may_wakeup(dev) && gpio_charger->wakeup_enabled)
	disable_irq_wake(gpio_charger->irq);
	power_supply_changed(gpio_charger->charger);

	return 0;
	}
	#endif

	static SIMPLE_DEV_PM_OPS(gpio_charger_pm_ops,
	gpio_charger_suspend, gpio_charger_resume);

	static const struct of_device_id gpio_charger_match[] = {
	{ .compatible = "gpio-charger" },
	{ }
	};
	MODULE_DEVICE_TABLE(of, gpio_charger_match);

	static struct platform_driver gpio_charger_driver = {
	.probe = gpio_charger_probe,
	.driver = {
	.name = "gpio-charger",
	.pm = &gpio_charger_pm_ops,
	.of_match_table = gpio_charger_match,
	},
	};

	module_platform_driver(gpio_charger_driver);

	MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
	MODULE_DESCRIPTION("Driver for chargers only communicating via GPIO(s)");
	MODULE_LICENSE("GPL");
	MODULE_ALIAS("platform:gpio-charger");