[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/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;

	struct resource *mem;
	void __iomem *base;

	int irq;
	int charge_irq;

	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)
{
	unsigned 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);

	cancel_delayed_work(&jz_battery->work);
	schedule_delayed_work(&jz_battery->work, 0);
}

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

	cancel_delayed_work(&jz_battery->work);
	schedule_delayed_work(&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 __devinit 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;

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

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

	jz_battery->cell = pdev->dev.platform_data;

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

	jz_battery->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!jz_battery->mem) {
		ret = -ENOENT;
		dev_err(&pdev->dev, "Failed to get platform mmio resource\n");
		goto err_free;
	}

	jz_battery->mem = request_mem_region(jz_battery->mem->start,
				resource_size(jz_battery->mem),	pdev->name);
	if (!jz_battery->mem) {
		ret = -EBUSY;
		dev_err(&pdev->dev, "Failed to request mmio memory region\n");
		goto err_free;
	}

	jz_battery->base = ioremap_nocache(jz_battery->mem->start,
				resource_size(jz_battery->mem));
	if (!jz_battery->base) {
		ret = -EBUSY;
		dev_err(&pdev->dev, "Failed to ioremap mmio memory\n");
		goto err_release_mem_region;
	}

	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_iounmap;
	}
	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_iounmap:
	platform_set_drvdata(pdev, NULL);
	iounmap(jz_battery->base);
err_release_mem_region:
	release_mem_region(jz_battery->mem->start, resource_size(jz_battery->mem));
err_free:
	kfree(jz_battery);
	return ret;
}

static int __devexit 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);

	iounmap(jz_battery->base);
	release_mem_region(jz_battery->mem->start, resource_size(jz_battery->mem));
	kfree(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		= __devexit_p(jz_battery_remove),
	.driver = {
		.name = "jz4740-battery",
		.owner = THIS_MODULE,
		.pm = JZ_BATTERY_PM_OPS,
	},
};

static int __init jz_battery_init(void)
{
	return platform_driver_register(&jz_battery_driver);
}
module_init(jz_battery_init);

static void __exit jz_battery_exit(void)
{
	platform_driver_unregister(&jz_battery_driver);
}
module_exit(jz_battery_exit);

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>
	22
	23	#include <linux/delay.h>
	24	#include <linux/gpio.h>
	25	#include <linux/mfd/core.h>
	26	#include <linux/power_supply.h>
	27
	28	#include <linux/power/jz4740-battery.h>
	29	#include <linux/jz4740-adc.h>
	30
	31	struct jz_battery {
	32	struct jz_battery_platform_data *pdata;
	33	struct platform_device *pdev;
	34
	35	struct resource *mem;
	36	void __iomem *base;
	37
	38	int irq;
	39	int charge_irq;
	40
	41	struct mfd_cell *cell;
	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	{
	69	unsigned long t;
	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
175	cancel_delayed_work(&jz_battery->work);
176	schedule_delayed_work(&jz_battery->work, 0);
177	}
178
179	static irqreturn_t jz_battery_charge_irq(int irq, void *data)
180	{
181	struct jz_battery *jz_battery = data;
182
183	cancel_delayed_work(&jz_battery->work);
184	schedule_delayed_work(&jz_battery->work, 0);
185
186	return IRQ_HANDLED;
187	}
188
189	static void jz_battery_update(struct jz_battery *jz_battery)
190	{
191	int status;
192	long voltage;
193	bool has_changed = false;
194	int is_charging;
195
196	if (gpio_is_valid(jz_battery->pdata->gpio_charge)) {
197	is_charging = gpio_get_value(jz_battery->pdata->gpio_charge);
198	is_charging ^= jz_battery->pdata->gpio_charge_active_low;
199	if (is_charging)
200	status = POWER_SUPPLY_STATUS_CHARGING;
201	else
202	status = POWER_SUPPLY_STATUS_NOT_CHARGING;
203
204	if (status != jz_battery->status) {
205	jz_battery->status = status;
206	has_changed = true;
207	}
208	}
209
210	voltage = jz_battery_read_voltage(jz_battery);
211	if (abs(voltage - jz_battery->voltage) < 50000) {
212	jz_battery->voltage = voltage;
213	has_changed = true;
214	}
215
216	if (has_changed)
217	power_supply_changed(&jz_battery->battery);
218	}
219
220	static enum power_supply_property jz_battery_properties[] = {
221	POWER_SUPPLY_PROP_STATUS,
222	POWER_SUPPLY_PROP_TECHNOLOGY,
223	POWER_SUPPLY_PROP_HEALTH,
224	POWER_SUPPLY_PROP_CAPACITY,
225	POWER_SUPPLY_PROP_VOLTAGE_NOW,
226	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
227	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
228	POWER_SUPPLY_PROP_PRESENT,
229	};
230
231	static void jz_battery_work(struct work_struct *work)
232	{
233	/* Too small interval will increase system workload */
234	const int interval = HZ * 30;
235	struct jz_battery *jz_battery = container_of(work, struct jz_battery,
236	work.work);
237
238	jz_battery_update(jz_battery);
239	schedule_delayed_work(&jz_battery->work, interval);
240	}
241
242	static int __devinit jz_battery_probe(struct platform_device *pdev)
243	{
244	int ret = 0;
245	struct jz_battery_platform_data *pdata = pdev->dev.parent->platform_data;
246	struct jz_battery *jz_battery;
247	struct power_supply *battery;
248
8477cedb LPC	249	if (!pdata) {
	250	dev_err(&pdev->dev, "No platform_data supplied\n");
	251	return -ENXIO;
	252	}
	253
f6a21388 LPC	254	jz_battery = kzalloc(sizeof(*jz_battery), GFP_KERNEL);
	255	if (!jz_battery) {
	256	dev_err(&pdev->dev, "Failed to allocate driver structure\n");
	257	return -ENOMEM;
	258	}
	259
	260	jz_battery->cell = pdev->dev.platform_data;
	261
	262	jz_battery->irq = platform_get_irq(pdev, 0);
	263	if (jz_battery->irq < 0) {
	264	ret = jz_battery->irq;
	265	dev_err(&pdev->dev, "Failed to get platform irq: %d\n", ret);
	266	goto err_free;
	267	}
	268
	269	jz_battery->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	270	if (!jz_battery->mem) {
	271	ret = -ENOENT;
	272	dev_err(&pdev->dev, "Failed to get platform mmio resource\n");
	273	goto err_free;
	274	}
	275
	276	jz_battery->mem = request_mem_region(jz_battery->mem->start,
	277	resource_size(jz_battery->mem), pdev->name);
	278	if (!jz_battery->mem) {
	279	ret = -EBUSY;
	280	dev_err(&pdev->dev, "Failed to request mmio memory region\n");
	281	goto err_free;
	282	}
	283
	284	jz_battery->base = ioremap_nocache(jz_battery->mem->start,
	285	resource_size(jz_battery->mem));
	286	if (!jz_battery->base) {
	287	ret = -EBUSY;
	288	dev_err(&pdev->dev, "Failed to ioremap mmio memory\n");
	289	goto err_release_mem_region;
	290	}
	291
	292	battery = &jz_battery->battery;
	293	battery->name = pdata->info.name;
	294	battery->type = POWER_SUPPLY_TYPE_BATTERY;
	295	battery->properties = jz_battery_properties;
	296	battery->num_properties = ARRAY_SIZE(jz_battery_properties);
	297	battery->get_property = jz_battery_get_property;
	298	battery->external_power_changed = jz_battery_external_power_changed;
	299	battery->use_for_apm = 1;
	300
	301	jz_battery->pdata = pdata;
	302	jz_battery->pdev = pdev;
	303
	304	init_completion(&jz_battery->read_completion);
8ec98fe0	305	mutex_init(&jz_battery->lock);
f6a21388 LPC	306
	307	INIT_DELAYED_WORK(&jz_battery->work, jz_battery_work);
	308
	309	ret = request_irq(jz_battery->irq, jz_battery_irq_handler, 0, pdev->name,
	310	jz_battery);
	311	if (ret) {
	312	dev_err(&pdev->dev, "Failed to request irq %d\n", ret);
	313	goto err_iounmap;
	314	}
	315	disable_irq(jz_battery->irq);
	316
	317	if (gpio_is_valid(pdata->gpio_charge)) {
	318	ret = gpio_request(pdata->gpio_charge, dev_name(&pdev->dev));
	319	if (ret) {
	320	dev_err(&pdev->dev, "charger state gpio request failed.\n");
	321	goto err_free_irq;
	322	}
	323	ret = gpio_direction_input(pdata->gpio_charge);
	324	if (ret) {
	325	dev_err(&pdev->dev, "charger state gpio set direction failed.\n");
	326	goto err_free_gpio;
	327	}
	328
	329	jz_battery->charge_irq = gpio_to_irq(pdata->gpio_charge);
	330
	331	if (jz_battery->charge_irq >= 0) {
	332	ret = request_irq(jz_battery->charge_irq,
	333	jz_battery_charge_irq,
	334	IRQF_TRIGGER_RISING \| IRQF_TRIGGER_FALLING,
	335	dev_name(&pdev->dev), jz_battery);
	336	if (ret) {
	337	dev_err(&pdev->dev, "Failed to request charge irq: %d\n", ret);
	338	goto err_free_gpio;
	339	}
	340	}
	341	} else {
	342	jz_battery->charge_irq = -1;
	343	}
	344
	345	if (jz_battery->pdata->info.voltage_max_design <= 2500000)
	346	jz4740_adc_set_config(pdev->dev.parent, JZ_ADC_CONFIG_BAT_MB,
	347	JZ_ADC_CONFIG_BAT_MB);
	348	else
	349	jz4740_adc_set_config(pdev->dev.parent, JZ_ADC_CONFIG_BAT_MB, 0);
	350
	351	ret = power_supply_register(&pdev->dev, &jz_battery->battery);
	352	if (ret) {
	353	dev_err(&pdev->dev, "power supply battery register failed.\n");
	354	goto err_free_charge_irq;
	355	}
	356
	357	platform_set_drvdata(pdev, jz_battery);
	358	schedule_delayed_work(&jz_battery->work, 0);
	359
	360	return 0;
	361
	362	err_free_charge_irq:
	363	if (jz_battery->charge_irq >= 0)
	364	free_irq(jz_battery->charge_irq, jz_battery);
	365	err_free_gpio:
	366	if (gpio_is_valid(pdata->gpio_charge))
	367	gpio_free(jz_battery->pdata->gpio_charge);
	368	err_free_irq:
	369	free_irq(jz_battery->irq, jz_battery);
370	err_iounmap:
371	platform_set_drvdata(pdev, NULL);
372	iounmap(jz_battery->base);
373	err_release_mem_region:
374	release_mem_region(jz_battery->mem->start, resource_size(jz_battery->mem));
375	err_free:
376	kfree(jz_battery);
377	return ret;
378	}
379
380	static int __devexit jz_battery_remove(struct platform_device *pdev)
381	{
382	struct jz_battery *jz_battery = platform_get_drvdata(pdev);
383
384	cancel_delayed_work_sync(&jz_battery->work);
385
386	if (gpio_is_valid(jz_battery->pdata->gpio_charge)) {
387	if (jz_battery->charge_irq >= 0)
388	free_irq(jz_battery->charge_irq, jz_battery);
389	gpio_free(jz_battery->pdata->gpio_charge);
390	}
391
392	power_supply_unregister(&jz_battery->battery);
393
394	free_irq(jz_battery->irq, jz_battery);
395
396	iounmap(jz_battery->base);
397	release_mem_region(jz_battery->mem->start, resource_size(jz_battery->mem));
5f29895f	398	kfree(jz_battery);
f6a21388 LPC	399
	400	return 0;
	401	}
	402
	403	#ifdef CONFIG_PM
	404	static int jz_battery_suspend(struct device *dev)
	405	{
	406	struct jz_battery *jz_battery = dev_get_drvdata(dev);
	407
	408	cancel_delayed_work_sync(&jz_battery->work);
	409	jz_battery->status = POWER_SUPPLY_STATUS_UNKNOWN;
	410
	411	return 0;
	412	}
	413
	414	static int jz_battery_resume(struct device *dev)
	415	{
	416	struct jz_battery *jz_battery = dev_get_drvdata(dev);
	417
	418	schedule_delayed_work(&jz_battery->work, 0);
	419
	420	return 0;
	421	}
	422
	423	static const struct dev_pm_ops jz_battery_pm_ops = {
	424	.suspend = jz_battery_suspend,
	425	.resume = jz_battery_resume,
	426	};
	427
	428	#define JZ_BATTERY_PM_OPS (&jz_battery_pm_ops)
	429	#else
	430	#define JZ_BATTERY_PM_OPS NULL
	431	#endif
	432
	433	static struct platform_driver jz_battery_driver = {
	434	.probe = jz_battery_probe,
	435	.remove = __devexit_p(jz_battery_remove),
	436	.driver = {
	437	.name = "jz4740-battery",
	438	.owner = THIS_MODULE,
	439	.pm = JZ_BATTERY_PM_OPS,
	440	},
	441	};
	442
	443	static int __init jz_battery_init(void)
	444	{
	445	return platform_driver_register(&jz_battery_driver);
	446	}
	447	module_init(jz_battery_init);
	448
	449	static void __exit jz_battery_exit(void)
	450	{
	451	platform_driver_unregister(&jz_battery_driver);
	452	}
	453	module_exit(jz_battery_exit);
	454
	455	MODULE_ALIAS("platform:jz4740-battery");
	456	MODULE_LICENSE("GPL");
	457	MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
	458	MODULE_DESCRIPTION("JZ4740 SoC battery driver");