drivers/power/jz4740-battery.c - kernel/msm-4.9 - Gitiles

 /*
  * Battery measurement code for Ingenic JZ SOC.
  *
  * Copyright (C) 2009 Jiejing Zhang <kzjeef@gmail.com>
  * Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
  *
  * based on tosa_battery.c
  *
  * Copyright (C) 2008 Marek Vasut <marek.vasut@gmail.com>
 *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  *
  */

 #include <linux/interrupt.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/io.h>

 #include <linux/delay.h>
 #include <linux/err.h>
 #include <linux/gpio.h>
 #include <linux/mfd/core.h>
 #include <linux/power_supply.h>

 #include <linux/power/jz4740-battery.h>
 #include <linux/jz4740-adc.h>

 struct jz_battery {
 	struct jz_battery_platform_data *pdata;
 	struct platform_device *pdev;

 	void __iomem *base;

 	int irq;
 	int charge_irq;

 	const struct mfd_cell *cell;

 	int status;
 	long voltage;

 	struct completion read_completion;

 	struct power_supply battery;
 	struct delayed_work work;

 	struct mutex lock;
 };

 static inline struct jz_battery *psy_to_jz_battery(struct power_supply *psy)
 {
 	return container_of(psy, struct jz_battery, battery);
 }

 static irqreturn_t jz_battery_irq_handler(int irq, void *devid)
 {
 	struct jz_battery *battery = devid;

 	complete(&battery->read_completion);
 	return IRQ_HANDLED;
 }

 static long jz_battery_read_voltage(struct jz_battery *battery)
 {
 	long t;
 	unsigned long val;
 	long voltage;

 	mutex_lock(&battery->lock);

 	reinit_completion(&battery->read_completion);

 	enable_irq(battery->irq);
 	battery->cell->enable(battery->pdev);

 	t = wait_for_completion_interruptible_timeout(&battery->read_completion,
 		HZ);

 	if (t > 0) {
 		val = readw(battery->base) & 0xfff;

 		if (battery->pdata->info.voltage_max_design <= 2500000)
 			val = (val * 78125UL) >> 7UL;
 		else
 			val = ((val * 924375UL) >> 9UL) + 33000;
 		voltage = (long)val;
 	} else {
 		voltage = t ? t : -ETIMEDOUT;
 	}

 	battery->cell->disable(battery->pdev);
 	disable_irq(battery->irq);

 	mutex_unlock(&battery->lock);

 	return voltage;
 }

 static int jz_battery_get_capacity(struct power_supply *psy)
 {
 	struct jz_battery *jz_battery = psy_to_jz_battery(psy);
 	struct power_supply_info *info = &jz_battery->pdata->info;
 	long voltage;
 	int ret;
 	int voltage_span;

 	voltage = jz_battery_read_voltage(jz_battery);

 	if (voltage < 0)
 		return voltage;

 	voltage_span = info->voltage_max_design - info->voltage_min_design;
 	ret = ((voltage - info->voltage_min_design) * 100) / voltage_span;

 	if (ret > 100)
 		ret = 100;
 	else if (ret < 0)
 		ret = 0;

 	return ret;
 }

 static int jz_battery_get_property(struct power_supply *psy,
 	enum power_supply_property psp, union power_supply_propval *val)
 {
 	struct jz_battery *jz_battery = psy_to_jz_battery(psy);
 	struct power_supply_info *info = &jz_battery->pdata->info;
 	long voltage;

 	switch (psp) {
 	case POWER_SUPPLY_PROP_STATUS:
 		val->intval = jz_battery->status;
 		break;
 	case POWER_SUPPLY_PROP_TECHNOLOGY:
 		val->intval = jz_battery->pdata->info.technology;
 		break;
 	case POWER_SUPPLY_PROP_HEALTH:
 		voltage = jz_battery_read_voltage(jz_battery);
 		if (voltage < info->voltage_min_design)
 			val->intval = POWER_SUPPLY_HEALTH_DEAD;
 		else
 			val->intval = POWER_SUPPLY_HEALTH_GOOD;
 		break;
 	case POWER_SUPPLY_PROP_CAPACITY:
 		val->intval = jz_battery_get_capacity(psy);
 		break;
 	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 		val->intval = jz_battery_read_voltage(jz_battery);
 		if (val->intval < 0)
 			return val->intval;
 		break;
 	case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
 		val->intval = info->voltage_max_design;
 		break;
 	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 		val->intval = info->voltage_min_design;
 		break;
 	case POWER_SUPPLY_PROP_PRESENT:
 		val->intval = 1;
 		break;
 	default:
 		return -EINVAL;
 	}
 	return 0;
 }

 static void jz_battery_external_power_changed(struct power_supply *psy)
 {
 	struct jz_battery *jz_battery = psy_to_jz_battery(psy);

 	mod_delayed_work(system_wq, &jz_battery->work, 0);
 }

 static irqreturn_t jz_battery_charge_irq(int irq, void *data)
 {
 	struct jz_battery *jz_battery = data;

 	mod_delayed_work(system_wq, &jz_battery->work, 0);

 	return IRQ_HANDLED;
 }

 static void jz_battery_update(struct jz_battery *jz_battery)
 {
 	int status;
 	long voltage;
 	bool has_changed = false;
 	int is_charging;

 	if (gpio_is_valid(jz_battery->pdata->gpio_charge)) {
 		is_charging = gpio_get_value(jz_battery->pdata->gpio_charge);
 		is_charging ^= jz_battery->pdata->gpio_charge_active_low;
 		if (is_charging)
 			status = POWER_SUPPLY_STATUS_CHARGING;
 		else
 			status = POWER_SUPPLY_STATUS_NOT_CHARGING;

 		if (status != jz_battery->status) {
 			jz_battery->status = status;
 			has_changed = true;
 		}
 	}

 	voltage = jz_battery_read_voltage(jz_battery);
 	if (abs(voltage - jz_battery->voltage) < 50000) {
 		jz_battery->voltage = voltage;
 		has_changed = true;
 	}

 	if (has_changed)
 		power_supply_changed(&jz_battery->battery);
 }

 static enum power_supply_property jz_battery_properties[] = {
 	POWER_SUPPLY_PROP_STATUS,
 	POWER_SUPPLY_PROP_TECHNOLOGY,
 	POWER_SUPPLY_PROP_HEALTH,
 	POWER_SUPPLY_PROP_CAPACITY,
 	POWER_SUPPLY_PROP_VOLTAGE_NOW,
 	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
 	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 	POWER_SUPPLY_PROP_PRESENT,
 };

 static void jz_battery_work(struct work_struct *work)
 {
 	/* Too small interval will increase system workload */
 	const int interval = HZ * 30;
 	struct jz_battery *jz_battery = container_of(work, struct jz_battery,
 					    work.work);

 	jz_battery_update(jz_battery);
 	schedule_delayed_work(&jz_battery->work, interval);
 }

 static int jz_battery_probe(struct platform_device *pdev)
 {
 	int ret = 0;
 	struct jz_battery_platform_data *pdata = pdev->dev.parent->platform_data;
 	struct jz_battery *jz_battery;
 	struct power_supply *battery;
 	struct resource *mem;

 	if (!pdata) {
 		dev_err(&pdev->dev, "No platform_data supplied\n");
 		return -ENXIO;
 	}

 	jz_battery = devm_kzalloc(&pdev->dev, sizeof(*jz_battery), GFP_KERNEL);
 	if (!jz_battery) {
 		dev_err(&pdev->dev, "Failed to allocate driver structure\n");
 		return -ENOMEM;
 	}

 	jz_battery->cell = mfd_get_cell(pdev);

 	jz_battery->irq = platform_get_irq(pdev, 0);
 	if (jz_battery->irq < 0) {
 		dev_err(&pdev->dev, "Failed to get platform irq: %d\n", ret);
 		return jz_battery->irq;
 	}

 	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);

 	jz_battery->base = devm_ioremap_resource(&pdev->dev, mem);
 	if (IS_ERR(jz_battery->base))
 		return PTR_ERR(jz_battery->base);

 	battery = &jz_battery->battery;
 	battery->name = pdata->info.name;
 	battery->type = POWER_SUPPLY_TYPE_BATTERY;
 	battery->properties	= jz_battery_properties;
 	battery->num_properties	= ARRAY_SIZE(jz_battery_properties);
 	battery->get_property = jz_battery_get_property;
 	battery->external_power_changed = jz_battery_external_power_changed;
 	battery->use_for_apm = 1;

 	jz_battery->pdata = pdata;
 	jz_battery->pdev = pdev;

 	init_completion(&jz_battery->read_completion);
 	mutex_init(&jz_battery->lock);

 	INIT_DELAYED_WORK(&jz_battery->work, jz_battery_work);

 	ret = request_irq(jz_battery->irq, jz_battery_irq_handler, 0, pdev->name,
 			jz_battery);
 	if (ret) {
 		dev_err(&pdev->dev, "Failed to request irq %d\n", ret);
 		return ret;
 	}
 	disable_irq(jz_battery->irq);

 	if (gpio_is_valid(pdata->gpio_charge)) {
 		ret = gpio_request(pdata->gpio_charge, dev_name(&pdev->dev));
 		if (ret) {
 			dev_err(&pdev->dev, "charger state gpio request failed.\n");
 			goto err_free_irq;
 		}
 		ret = gpio_direction_input(pdata->gpio_charge);
 		if (ret) {
 			dev_err(&pdev->dev, "charger state gpio set direction failed.\n");
 			goto err_free_gpio;
 		}

 		jz_battery->charge_irq = gpio_to_irq(pdata->gpio_charge);

 		if (jz_battery->charge_irq >= 0) {
 			ret = request_irq(jz_battery->charge_irq,
 				    jz_battery_charge_irq,
 				    IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
 				    dev_name(&pdev->dev), jz_battery);
 			if (ret) {
 				dev_err(&pdev->dev, "Failed to request charge irq: %d\n", ret);
 				goto err_free_gpio;
 			}
 		}
 	} else {
 		jz_battery->charge_irq = -1;
 	}

 	if (jz_battery->pdata->info.voltage_max_design <= 2500000)
 		jz4740_adc_set_config(pdev->dev.parent, JZ_ADC_CONFIG_BAT_MB,
 			JZ_ADC_CONFIG_BAT_MB);
 	else
 		jz4740_adc_set_config(pdev->dev.parent, JZ_ADC_CONFIG_BAT_MB, 0);

 	ret = power_supply_register(&pdev->dev, &jz_battery->battery);
 	if (ret) {
 		dev_err(&pdev->dev, "power supply battery register failed.\n");
 		goto err_free_charge_irq;
 	}

 	platform_set_drvdata(pdev, jz_battery);
 	schedule_delayed_work(&jz_battery->work, 0);

 	return 0;

 err_free_charge_irq:
 	if (jz_battery->charge_irq >= 0)
 		free_irq(jz_battery->charge_irq, jz_battery);
 err_free_gpio:
 	if (gpio_is_valid(pdata->gpio_charge))
 		gpio_free(jz_battery->pdata->gpio_charge);
 err_free_irq:
 	free_irq(jz_battery->irq, jz_battery);
 	return ret;
 }

 static int jz_battery_remove(struct platform_device *pdev)
 {
 	struct jz_battery *jz_battery = platform_get_drvdata(pdev);

 	cancel_delayed_work_sync(&jz_battery->work);

 	if (gpio_is_valid(jz_battery->pdata->gpio_charge)) {
 		if (jz_battery->charge_irq >= 0)
 			free_irq(jz_battery->charge_irq, jz_battery);
 		gpio_free(jz_battery->pdata->gpio_charge);
 	}

 	power_supply_unregister(&jz_battery->battery);

 	free_irq(jz_battery->irq, jz_battery);

 	return 0;
 }

 #ifdef CONFIG_PM
 static int jz_battery_suspend(struct device *dev)
 {
 	struct jz_battery *jz_battery = dev_get_drvdata(dev);

 	cancel_delayed_work_sync(&jz_battery->work);
 	jz_battery->status = POWER_SUPPLY_STATUS_UNKNOWN;

 	return 0;
 }

 static int jz_battery_resume(struct device *dev)
 {
 	struct jz_battery *jz_battery = dev_get_drvdata(dev);

 	schedule_delayed_work(&jz_battery->work, 0);

 	return 0;
 }

 static const struct dev_pm_ops jz_battery_pm_ops = {
 	.suspend	= jz_battery_suspend,
 	.resume		= jz_battery_resume,
 };

 #define JZ_BATTERY_PM_OPS (&jz_battery_pm_ops)
 #else
 #define JZ_BATTERY_PM_OPS NULL
 #endif

 static struct platform_driver jz_battery_driver = {
 	.probe		= jz_battery_probe,
 	.remove		= jz_battery_remove,
 	.driver = {
 		.name = "jz4740-battery",
 		.owner = THIS_MODULE,
 		.pm = JZ_BATTERY_PM_OPS,
 	},
 };

 module_platform_driver(jz_battery_driver);

 MODULE_ALIAS("platform:jz4740-battery");
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
 MODULE_DESCRIPTION("JZ4740 SoC battery driver");
	/*
	* Battery measurement code for Ingenic JZ SOC.
	*
	* Copyright (C) 2009 Jiejing Zhang <kzjeef@gmail.com>
	* Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
	*
	* based on tosa_battery.c
	*
	* Copyright (C) 2008 Marek Vasut <marek.vasut@gmail.com>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*
	*/

	#include <linux/interrupt.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/platform_device.h>
	#include <linux/slab.h>
	#include <linux/io.h>

	#include <linux/delay.h>
	#include <linux/err.h>
	#include <linux/gpio.h>
	#include <linux/mfd/core.h>
	#include <linux/power_supply.h>

	#include <linux/power/jz4740-battery.h>
	#include <linux/jz4740-adc.h>

	struct jz_battery {
	struct jz_battery_platform_data *pdata;
	struct platform_device *pdev;

	void __iomem *base;

	int irq;
	int charge_irq;

	const struct mfd_cell *cell;

	int status;
	long voltage;

	struct completion read_completion;

	struct power_supply battery;
	struct delayed_work work;

	struct mutex lock;
	};

	static inline struct jz_battery psy_to_jz_battery(struct power_supply psy)
	{
	return container_of(psy, struct jz_battery, battery);
	}

	static irqreturn_t jz_battery_irq_handler(int irq, void *devid)
	{
	struct jz_battery *battery = devid;

	complete(&battery->read_completion);
	return IRQ_HANDLED;
	}

	static long jz_battery_read_voltage(struct jz_battery *battery)
	{
	long t;
	unsigned long val;
	long voltage;

	mutex_lock(&battery->lock);

	reinit_completion(&battery->read_completion);

	enable_irq(battery->irq);
	battery->cell->enable(battery->pdev);

	t = wait_for_completion_interruptible_timeout(&battery->read_completion,
	HZ);

	if (t > 0) {
	val = readw(battery->base) & 0xfff;

	if (battery->pdata->info.voltage_max_design <= 2500000)
	val = (val * 78125UL) >> 7UL;
	else
	val = ((val * 924375UL) >> 9UL) + 33000;
	voltage = (long)val;
	} else {
	voltage = t ? t : -ETIMEDOUT;
	}

	battery->cell->disable(battery->pdev);
	disable_irq(battery->irq);

	mutex_unlock(&battery->lock);

	return voltage;
	}

	static int jz_battery_get_capacity(struct power_supply *psy)
	{
	struct jz_battery *jz_battery = psy_to_jz_battery(psy);
	struct power_supply_info *info = &jz_battery->pdata->info;
	long voltage;
	int ret;
	int voltage_span;

	voltage = jz_battery_read_voltage(jz_battery);

	if (voltage < 0)
	return voltage;

	voltage_span = info->voltage_max_design - info->voltage_min_design;
	ret = ((voltage - info->voltage_min_design) * 100) / voltage_span;

	if (ret > 100)
	ret = 100;
	else if (ret < 0)
	ret = 0;

	return ret;
	}

	static int jz_battery_get_property(struct power_supply *psy,
	enum power_supply_property psp, union power_supply_propval *val)
	{
	struct jz_battery *jz_battery = psy_to_jz_battery(psy);
	struct power_supply_info *info = &jz_battery->pdata->info;
	long voltage;

	switch (psp) {
	case POWER_SUPPLY_PROP_STATUS:
	val->intval = jz_battery->status;
	break;
	case POWER_SUPPLY_PROP_TECHNOLOGY:
	val->intval = jz_battery->pdata->info.technology;
	break;
	case POWER_SUPPLY_PROP_HEALTH:
	voltage = jz_battery_read_voltage(jz_battery);
	if (voltage < info->voltage_min_design)
	val->intval = POWER_SUPPLY_HEALTH_DEAD;
	else
	val->intval = POWER_SUPPLY_HEALTH_GOOD;
	break;
	case POWER_SUPPLY_PROP_CAPACITY:
	val->intval = jz_battery_get_capacity(psy);
	break;
	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
	val->intval = jz_battery_read_voltage(jz_battery);
	if (val->intval < 0)
	return val->intval;
	break;
	case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
	val->intval = info->voltage_max_design;
	break;
	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
	val->intval = info->voltage_min_design;
	break;
	case POWER_SUPPLY_PROP_PRESENT:
	val->intval = 1;
	break;
	default:
	return -EINVAL;
	}
	return 0;
	}

	static void jz_battery_external_power_changed(struct power_supply *psy)
	{
	struct jz_battery *jz_battery = psy_to_jz_battery(psy);

	mod_delayed_work(system_wq, &jz_battery->work, 0);
	}

	static irqreturn_t jz_battery_charge_irq(int irq, void *data)
	{
	struct jz_battery *jz_battery = data;

	mod_delayed_work(system_wq, &jz_battery->work, 0);

	return IRQ_HANDLED;
	}

	static void jz_battery_update(struct jz_battery *jz_battery)
	{
	int status;
	long voltage;
	bool has_changed = false;
	int is_charging;

	if (gpio_is_valid(jz_battery->pdata->gpio_charge)) {
	is_charging = gpio_get_value(jz_battery->pdata->gpio_charge);
	is_charging ^= jz_battery->pdata->gpio_charge_active_low;
	if (is_charging)
	status = POWER_SUPPLY_STATUS_CHARGING;
	else
	status = POWER_SUPPLY_STATUS_NOT_CHARGING;

	if (status != jz_battery->status) {
	jz_battery->status = status;
	has_changed = true;
	}
	}

	voltage = jz_battery_read_voltage(jz_battery);
	if (abs(voltage - jz_battery->voltage) < 50000) {
	jz_battery->voltage = voltage;
	has_changed = true;
	}

	if (has_changed)
	power_supply_changed(&jz_battery->battery);
	}

	static enum power_supply_property jz_battery_properties[] = {
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_TECHNOLOGY,
	POWER_SUPPLY_PROP_HEALTH,
	POWER_SUPPLY_PROP_CAPACITY,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
	POWER_SUPPLY_PROP_PRESENT,
	};

	static void jz_battery_work(struct work_struct *work)
	{
	/* Too small interval will increase system workload */
	const int interval = HZ * 30;
	struct jz_battery *jz_battery = container_of(work, struct jz_battery,
	work.work);

	jz_battery_update(jz_battery);
	schedule_delayed_work(&jz_battery->work, interval);
	}

	static int jz_battery_probe(struct platform_device *pdev)
	{
	int ret = 0;
	struct jz_battery_platform_data *pdata = pdev->dev.parent->platform_data;
	struct jz_battery *jz_battery;
	struct power_supply *battery;
	struct resource *mem;

	if (!pdata) {
	dev_err(&pdev->dev, "No platform_data supplied\n");
	return -ENXIO;
	}

	jz_battery = devm_kzalloc(&pdev->dev, sizeof(*jz_battery), GFP_KERNEL);
	if (!jz_battery) {
	dev_err(&pdev->dev, "Failed to allocate driver structure\n");
	return -ENOMEM;
	}

	jz_battery->cell = mfd_get_cell(pdev);

	jz_battery->irq = platform_get_irq(pdev, 0);
	if (jz_battery->irq < 0) {
	dev_err(&pdev->dev, "Failed to get platform irq: %d\n", ret);
	return jz_battery->irq;
	}

	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	jz_battery->base = devm_ioremap_resource(&pdev->dev, mem);
	if (IS_ERR(jz_battery->base))
	return PTR_ERR(jz_battery->base);

	battery = &jz_battery->battery;
	battery->name = pdata->info.name;
	battery->type = POWER_SUPPLY_TYPE_BATTERY;
	battery->properties = jz_battery_properties;
	battery->num_properties = ARRAY_SIZE(jz_battery_properties);
	battery->get_property = jz_battery_get_property;
	battery->external_power_changed = jz_battery_external_power_changed;
	battery->use_for_apm = 1;

	jz_battery->pdata = pdata;
	jz_battery->pdev = pdev;

	init_completion(&jz_battery->read_completion);
	mutex_init(&jz_battery->lock);

	INIT_DELAYED_WORK(&jz_battery->work, jz_battery_work);

	ret = request_irq(jz_battery->irq, jz_battery_irq_handler, 0, pdev->name,
	jz_battery);
	if (ret) {
	dev_err(&pdev->dev, "Failed to request irq %d\n", ret);
	return ret;
	}
	disable_irq(jz_battery->irq);

	if (gpio_is_valid(pdata->gpio_charge)) {
	ret = gpio_request(pdata->gpio_charge, dev_name(&pdev->dev));
	if (ret) {
	dev_err(&pdev->dev, "charger state gpio request failed.\n");
	goto err_free_irq;
	}
	ret = gpio_direction_input(pdata->gpio_charge);
	if (ret) {
	dev_err(&pdev->dev, "charger state gpio set direction failed.\n");
	goto err_free_gpio;
	}

	jz_battery->charge_irq = gpio_to_irq(pdata->gpio_charge);

	if (jz_battery->charge_irq >= 0) {
	ret = request_irq(jz_battery->charge_irq,
	jz_battery_charge_irq,
	IRQF_TRIGGER_RISING \| IRQF_TRIGGER_FALLING,
	dev_name(&pdev->dev), jz_battery);
	if (ret) {
	dev_err(&pdev->dev, "Failed to request charge irq: %d\n", ret);
	goto err_free_gpio;
	}
	}
	} else {
	jz_battery->charge_irq = -1;
	}

	if (jz_battery->pdata->info.voltage_max_design <= 2500000)
	jz4740_adc_set_config(pdev->dev.parent, JZ_ADC_CONFIG_BAT_MB,
	JZ_ADC_CONFIG_BAT_MB);
	else
	jz4740_adc_set_config(pdev->dev.parent, JZ_ADC_CONFIG_BAT_MB, 0);

	ret = power_supply_register(&pdev->dev, &jz_battery->battery);
	if (ret) {
	dev_err(&pdev->dev, "power supply battery register failed.\n");
	goto err_free_charge_irq;
	}

	platform_set_drvdata(pdev, jz_battery);
	schedule_delayed_work(&jz_battery->work, 0);

	return 0;

	err_free_charge_irq:
	if (jz_battery->charge_irq >= 0)
	free_irq(jz_battery->charge_irq, jz_battery);
	err_free_gpio:
	if (gpio_is_valid(pdata->gpio_charge))
	gpio_free(jz_battery->pdata->gpio_charge);
	err_free_irq:
	free_irq(jz_battery->irq, jz_battery);
	return ret;
	}

	static int jz_battery_remove(struct platform_device *pdev)
	{
	struct jz_battery *jz_battery = platform_get_drvdata(pdev);

	cancel_delayed_work_sync(&jz_battery->work);

	if (gpio_is_valid(jz_battery->pdata->gpio_charge)) {
	if (jz_battery->charge_irq >= 0)
	free_irq(jz_battery->charge_irq, jz_battery);
	gpio_free(jz_battery->pdata->gpio_charge);
	}

	power_supply_unregister(&jz_battery->battery);

	free_irq(jz_battery->irq, jz_battery);

	return 0;
	}

	#ifdef CONFIG_PM
	static int jz_battery_suspend(struct device *dev)
	{
	struct jz_battery *jz_battery = dev_get_drvdata(dev);

	cancel_delayed_work_sync(&jz_battery->work);
	jz_battery->status = POWER_SUPPLY_STATUS_UNKNOWN;

	return 0;
	}

	static int jz_battery_resume(struct device *dev)
	{
	struct jz_battery *jz_battery = dev_get_drvdata(dev);

	schedule_delayed_work(&jz_battery->work, 0);

	return 0;
	}

	static const struct dev_pm_ops jz_battery_pm_ops = {
	.suspend = jz_battery_suspend,
	.resume = jz_battery_resume,
	};

	#define JZ_BATTERY_PM_OPS (&jz_battery_pm_ops)
	#else
	#define JZ_BATTERY_PM_OPS NULL
	#endif

	static struct platform_driver jz_battery_driver = {
	.probe = jz_battery_probe,
	.remove = jz_battery_remove,
	.driver = {
	.name = "jz4740-battery",
	.owner = THIS_MODULE,
	.pm = JZ_BATTERY_PM_OPS,
	},
	};

	module_platform_driver(jz_battery_driver);

	MODULE_ALIAS("platform:jz4740-battery");
	MODULE_LICENSE("GPL");
	MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
	MODULE_DESCRIPTION("JZ4740 SoC battery driver");