[deliverable/linux.git] / drivers / power / jz4740-battery.c

/*
 * 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/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);

	INIT_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_request_and_ioremap(&pdev->dev, mem);
	if (!jz_battery->base)
		return -EBUSY;

	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);
		goto err;
	}
	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);
err:
	platform_set_drvdata(pdev, NULL);
	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");
Commit	Line	Data
f6a21388 LPC	1	/*
	2	* Battery measurement code for Ingenic JZ SOC.
	3	*
	4	* Copyright (C) 2009 Jiejing Zhang <kzjeef@gmail.com>
	5	* Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
	6	*
	7	* based on tosa_battery.c
	8	*
	9	* Copyright (C) 2008 Marek Vasut <marek.vasut@gmail.com>
	10	*
	11	* This program is free software; you can redistribute it and/or modify
	12	* it under the terms of the GNU General Public License version 2 as
	13	* published by the Free Software Foundation.
	14	*
	15	*/
	16
	17	#include <linux/interrupt.h>
	18	#include <linux/kernel.h>
	19	#include <linux/module.h>
	20	#include <linux/platform_device.h>
	21	#include <linux/slab.h>
f3dcab70	22	#include <linux/io.h>
f6a21388 LPC	23
	24	#include <linux/delay.h>
	25	#include <linux/gpio.h>
	26	#include <linux/mfd/core.h>
	27	#include <linux/power_supply.h>
	28
	29	#include <linux/power/jz4740-battery.h>
	30	#include <linux/jz4740-adc.h>
	31
	32	struct jz_battery {
	33	struct jz_battery_platform_data *pdata;
	34	struct platform_device *pdev;
	35
f6a21388 LPC	36	void __iomem *base;
	37
	38	int irq;
	39	int charge_irq;
	40
e9300066	41	const struct mfd_cell *cell;
f6a21388 LPC	42
	43	int status;
	44	long voltage;
	45
	46	struct completion read_completion;
	47
	48	struct power_supply battery;
	49	struct delayed_work work;
8ec98fe0 LPC	50
8ec98fe0 LPC	51	struct mutex lock;
f6a21388 LPC	52	};
	53
	54	static inline struct jz_battery psy_to_jz_battery(struct power_supply psy)
	55	{
	56	return container_of(psy, struct jz_battery, battery);
	57	}
	58
	59	static irqreturn_t jz_battery_irq_handler(int irq, void *devid)
	60	{
	61	struct jz_battery *battery = devid;
	62
	63	complete(&battery->read_completion);
	64	return IRQ_HANDLED;
	65	}
	66
	67	static long jz_battery_read_voltage(struct jz_battery *battery)
	68	{
ef7906f3	69	long t;
f6a21388 LPC	70	unsigned long val;
	71	long voltage;
	72
8ec98fe0 LPC	73	mutex_lock(&battery->lock);
8ec98fe0 LPC	74
f6a21388 LPC	75	INIT_COMPLETION(battery->read_completion);
	76
	77	enable_irq(battery->irq);
	78	battery->cell->enable(battery->pdev);
	79
	80	t = wait_for_completion_interruptible_timeout(&battery->read_completion,
	81	HZ);
	82
	83	if (t > 0) {
	84	val = readw(battery->base) & 0xfff;
	85
	86	if (battery->pdata->info.voltage_max_design <= 2500000)
	87	val = (val * 78125UL) >> 7UL;
	88	else
	89	val = ((val * 924375UL) >> 9UL) + 33000;
	90	voltage = (long)val;
	91	} else {
	92	voltage = t ? t : -ETIMEDOUT;
	93	}
	94
	95	battery->cell->disable(battery->pdev);
	96	disable_irq(battery->irq);
	97
8ec98fe0 LPC	98	mutex_unlock(&battery->lock);
8ec98fe0 LPC	99
f6a21388 LPC	100	return voltage;
	101	}
	102
	103	static int jz_battery_get_capacity(struct power_supply *psy)
	104	{
	105	struct jz_battery *jz_battery = psy_to_jz_battery(psy);
	106	struct power_supply_info *info = &jz_battery->pdata->info;
	107	long voltage;
	108	int ret;
	109	int voltage_span;
	110
	111	voltage = jz_battery_read_voltage(jz_battery);
	112
	113	if (voltage < 0)
	114	return voltage;
	115
	116	voltage_span = info->voltage_max_design - info->voltage_min_design;
	117	ret = ((voltage - info->voltage_min_design) * 100) / voltage_span;
	118
	119	if (ret > 100)
	120	ret = 100;
	121	else if (ret < 0)
	122	ret = 0;
	123
	124	return ret;
	125	}
	126
	127	static int jz_battery_get_property(struct power_supply *psy,
	128	enum power_supply_property psp, union power_supply_propval *val)
	129	{
	130	struct jz_battery *jz_battery = psy_to_jz_battery(psy);
	131	struct power_supply_info *info = &jz_battery->pdata->info;
	132	long voltage;
	133
	134	switch (psp) {
	135	case POWER_SUPPLY_PROP_STATUS:
	136	val->intval = jz_battery->status;
	137	break;
	138	case POWER_SUPPLY_PROP_TECHNOLOGY:
	139	val->intval = jz_battery->pdata->info.technology;
	140	break;
	141	case POWER_SUPPLY_PROP_HEALTH:
	142	voltage = jz_battery_read_voltage(jz_battery);
	143	if (voltage < info->voltage_min_design)
	144	val->intval = POWER_SUPPLY_HEALTH_DEAD;
	145	else
	146	val->intval = POWER_SUPPLY_HEALTH_GOOD;
	147	break;
	148	case POWER_SUPPLY_PROP_CAPACITY:
	149	val->intval = jz_battery_get_capacity(psy);
	150	break;
	151	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
	152	val->intval = jz_battery_read_voltage(jz_battery);
	153	if (val->intval < 0)
	154	return val->intval;
	155	break;
	156	case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
	157	val->intval = info->voltage_max_design;
	158	break;
	159	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
	160	val->intval = info->voltage_min_design;
	161	break;
	162	case POWER_SUPPLY_PROP_PRESENT:
	163	val->intval = 1;
164	break;
165	default:
166	return -EINVAL;
167	}
168	return 0;
169	}
170
171	static void jz_battery_external_power_changed(struct power_supply *psy)
172	{
173	struct jz_battery *jz_battery = psy_to_jz_battery(psy);
174
41f63c53	175	mod_delayed_work(system_wq, &jz_battery->work, 0);
f6a21388 LPC	176	}
	177
	178	static irqreturn_t jz_battery_charge_irq(int irq, void *data)
	179	{
	180	struct jz_battery *jz_battery = data;
	181
41f63c53	182	mod_delayed_work(system_wq, &jz_battery->work, 0);
f6a21388 LPC	183
	184	return IRQ_HANDLED;
	185	}
	186
	187	static void jz_battery_update(struct jz_battery *jz_battery)
	188	{
	189	int status;
	190	long voltage;
	191	bool has_changed = false;
	192	int is_charging;
	193
	194	if (gpio_is_valid(jz_battery->pdata->gpio_charge)) {
	195	is_charging = gpio_get_value(jz_battery->pdata->gpio_charge);
	196	is_charging ^= jz_battery->pdata->gpio_charge_active_low;
	197	if (is_charging)
	198	status = POWER_SUPPLY_STATUS_CHARGING;
	199	else
	200	status = POWER_SUPPLY_STATUS_NOT_CHARGING;
	201
	202	if (status != jz_battery->status) {
	203	jz_battery->status = status;
	204	has_changed = true;
	205	}
	206	}
	207
	208	voltage = jz_battery_read_voltage(jz_battery);
	209	if (abs(voltage - jz_battery->voltage) < 50000) {
	210	jz_battery->voltage = voltage;
	211	has_changed = true;
	212	}
	213
	214	if (has_changed)
	215	power_supply_changed(&jz_battery->battery);
	216	}
	217
	218	static enum power_supply_property jz_battery_properties[] = {
	219	POWER_SUPPLY_PROP_STATUS,
	220	POWER_SUPPLY_PROP_TECHNOLOGY,
	221	POWER_SUPPLY_PROP_HEALTH,
	222	POWER_SUPPLY_PROP_CAPACITY,
	223	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	224	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
	225	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
	226	POWER_SUPPLY_PROP_PRESENT,
	227	};
	228
	229	static void jz_battery_work(struct work_struct *work)
	230	{
	231	/* Too small interval will increase system workload */
	232	const int interval = HZ * 30;
	233	struct jz_battery *jz_battery = container_of(work, struct jz_battery,
	234	work.work);
	235
	236	jz_battery_update(jz_battery);
	237	schedule_delayed_work(&jz_battery->work, interval);
	238	}
	239
c8afa640	240	static int jz_battery_probe(struct platform_device *pdev)
f6a21388 LPC	241	{
	242	int ret = 0;
	243	struct jz_battery_platform_data *pdata = pdev->dev.parent->platform_data;
	244	struct jz_battery *jz_battery;
	245	struct power_supply *battery;
9790f98f	246	struct resource *mem;
f6a21388	247
8477cedb LPC	248	if (!pdata) {
	249	dev_err(&pdev->dev, "No platform_data supplied\n");
	250	return -ENXIO;
	251	}
	252
ec073c9b	253	jz_battery = devm_kzalloc(&pdev->dev, sizeof(*jz_battery), GFP_KERNEL);
f6a21388 LPC	254	if (!jz_battery) {
	255	dev_err(&pdev->dev, "Failed to allocate driver structure\n");
	256	return -ENOMEM;
	257	}
	258
6a54ac21	259	jz_battery->cell = mfd_get_cell(pdev);
f6a21388 LPC	260
	261	jz_battery->irq = platform_get_irq(pdev, 0);
	262	if (jz_battery->irq < 0) {
f6a21388	263	dev_err(&pdev->dev, "Failed to get platform irq: %d\n", ret);
ec073c9b	264	return jz_battery->irq;
f6a21388 LPC	265	}
f6a21388 LPC	266
9790f98f	267	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
f6a21388	268
9790f98f MPS	269	jz_battery->base = devm_request_and_ioremap(&pdev->dev, mem);
9790f98f MPS	270	if (!jz_battery->base)
ec073c9b	271	return -EBUSY;
f6a21388 LPC	272
	273	battery = &jz_battery->battery;
	274	battery->name = pdata->info.name;
	275	battery->type = POWER_SUPPLY_TYPE_BATTERY;
	276	battery->properties = jz_battery_properties;
	277	battery->num_properties = ARRAY_SIZE(jz_battery_properties);
	278	battery->get_property = jz_battery_get_property;
	279	battery->external_power_changed = jz_battery_external_power_changed;
	280	battery->use_for_apm = 1;
	281
	282	jz_battery->pdata = pdata;
	283	jz_battery->pdev = pdev;
	284
	285	init_completion(&jz_battery->read_completion);
8ec98fe0	286	mutex_init(&jz_battery->lock);
f6a21388 LPC	287
	288	INIT_DELAYED_WORK(&jz_battery->work, jz_battery_work);
	289
	290	ret = request_irq(jz_battery->irq, jz_battery_irq_handler, 0, pdev->name,
	291	jz_battery);
	292	if (ret) {
	293	dev_err(&pdev->dev, "Failed to request irq %d\n", ret);
9790f98f	294	goto err;
f6a21388 LPC	295	}
	296	disable_irq(jz_battery->irq);
	297
	298	if (gpio_is_valid(pdata->gpio_charge)) {
	299	ret = gpio_request(pdata->gpio_charge, dev_name(&pdev->dev));
	300	if (ret) {
	301	dev_err(&pdev->dev, "charger state gpio request failed.\n");
	302	goto err_free_irq;
	303	}
	304	ret = gpio_direction_input(pdata->gpio_charge);
	305	if (ret) {
	306	dev_err(&pdev->dev, "charger state gpio set direction failed.\n");
	307	goto err_free_gpio;
	308	}
	309
	310	jz_battery->charge_irq = gpio_to_irq(pdata->gpio_charge);
	311
	312	if (jz_battery->charge_irq >= 0) {
	313	ret = request_irq(jz_battery->charge_irq,
	314	jz_battery_charge_irq,
	315	IRQF_TRIGGER_RISING \| IRQF_TRIGGER_FALLING,
	316	dev_name(&pdev->dev), jz_battery);
	317	if (ret) {
	318	dev_err(&pdev->dev, "Failed to request charge irq: %d\n", ret);
	319	goto err_free_gpio;
	320	}
	321	}
	322	} else {
	323	jz_battery->charge_irq = -1;
	324	}
	325
	326	if (jz_battery->pdata->info.voltage_max_design <= 2500000)
	327	jz4740_adc_set_config(pdev->dev.parent, JZ_ADC_CONFIG_BAT_MB,
	328	JZ_ADC_CONFIG_BAT_MB);
	329	else
	330	jz4740_adc_set_config(pdev->dev.parent, JZ_ADC_CONFIG_BAT_MB, 0);
	331
	332	ret = power_supply_register(&pdev->dev, &jz_battery->battery);
	333	if (ret) {
	334	dev_err(&pdev->dev, "power supply battery register failed.\n");
	335	goto err_free_charge_irq;
	336	}
	337
	338	platform_set_drvdata(pdev, jz_battery);
	339	schedule_delayed_work(&jz_battery->work, 0);
	340
	341	return 0;
	342
	343	err_free_charge_irq:
	344	if (jz_battery->charge_irq >= 0)
	345	free_irq(jz_battery->charge_irq, jz_battery);
	346	err_free_gpio:
	347	if (gpio_is_valid(pdata->gpio_charge))
	348	gpio_free(jz_battery->pdata->gpio_charge);
	349	err_free_irq:
	350	free_irq(jz_battery->irq, jz_battery);
9790f98f	351	err:
f6a21388	352	platform_set_drvdata(pdev, NULL);
f6a21388 LPC	353	return ret;
	354	}
	355
415ec69f	356	static int jz_battery_remove(struct platform_device *pdev)
f6a21388 LPC	357	{
	358	struct jz_battery *jz_battery = platform_get_drvdata(pdev);
	359
	360	cancel_delayed_work_sync(&jz_battery->work);
	361
	362	if (gpio_is_valid(jz_battery->pdata->gpio_charge)) {
	363	if (jz_battery->charge_irq >= 0)
	364	free_irq(jz_battery->charge_irq, jz_battery);
	365	gpio_free(jz_battery->pdata->gpio_charge);
	366	}
	367
	368	power_supply_unregister(&jz_battery->battery);
	369
	370	free_irq(jz_battery->irq, jz_battery);
	371
f6a21388 LPC	372	return 0;
	373	}
	374
	375	#ifdef CONFIG_PM
	376	static int jz_battery_suspend(struct device *dev)
	377	{
	378	struct jz_battery *jz_battery = dev_get_drvdata(dev);
	379
	380	cancel_delayed_work_sync(&jz_battery->work);
	381	jz_battery->status = POWER_SUPPLY_STATUS_UNKNOWN;
	382
	383	return 0;
	384	}
	385
	386	static int jz_battery_resume(struct device *dev)
	387	{
	388	struct jz_battery *jz_battery = dev_get_drvdata(dev);
	389
	390	schedule_delayed_work(&jz_battery->work, 0);
	391
	392	return 0;
	393	}
	394
	395	static const struct dev_pm_ops jz_battery_pm_ops = {
	396	.suspend = jz_battery_suspend,
	397	.resume = jz_battery_resume,
	398	};
	399
	400	#define JZ_BATTERY_PM_OPS (&jz_battery_pm_ops)
	401	#else
	402	#define JZ_BATTERY_PM_OPS NULL
	403	#endif
	404
	405	static struct platform_driver jz_battery_driver = {
	406	.probe = jz_battery_probe,
28ea73f4	407	.remove = jz_battery_remove,
f6a21388 LPC	408	.driver = {
	409	.name = "jz4740-battery",
	410	.owner = THIS_MODULE,
	411	.pm = JZ_BATTERY_PM_OPS,
	412	},
	413	};
	414
300bac7f	415	module_platform_driver(jz_battery_driver);
f6a21388 LPC	416
	417	MODULE_ALIAS("platform:jz4740-battery");
	418	MODULE_LICENSE("GPL");
	419	MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
	420	MODULE_DESCRIPTION("JZ4740 SoC battery driver");