[linux-2.6-block.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;

	struct resource *mem;
	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;

	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 = mfd_get_cell(pdev);

	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 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		= 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
	36	struct resource *mem;
	37	void __iomem *base;
	38
	39	int irq;
	40	int charge_irq;
	41
e9300066	42	const struct mfd_cell *cell;
f6a21388 LPC	43
	44	int status;
	45	long voltage;
	46
	47	struct completion read_completion;
	48
	49	struct power_supply battery;
	50	struct delayed_work work;
8ec98fe0 LPC	51
8ec98fe0 LPC	52	struct mutex lock;
f6a21388 LPC	53	};
	54
	55	static inline struct jz_battery psy_to_jz_battery(struct power_supply psy)
	56	{
	57	return container_of(psy, struct jz_battery, battery);
	58	}
	59
	60	static irqreturn_t jz_battery_irq_handler(int irq, void *devid)
	61	{
	62	struct jz_battery *battery = devid;
	63
	64	complete(&battery->read_completion);
	65	return IRQ_HANDLED;
	66	}
	67
	68	static long jz_battery_read_voltage(struct jz_battery *battery)
	69	{
ef7906f3	70	long t;
f6a21388 LPC	71	unsigned long val;
	72	long voltage;
	73
8ec98fe0 LPC	74	mutex_lock(&battery->lock);
8ec98fe0 LPC	75
f6a21388 LPC	76	INIT_COMPLETION(battery->read_completion);
	77
	78	enable_irq(battery->irq);
	79	battery->cell->enable(battery->pdev);
	80
	81	t = wait_for_completion_interruptible_timeout(&battery->read_completion,
	82	HZ);
	83
	84	if (t > 0) {
	85	val = readw(battery->base) & 0xfff;
	86
	87	if (battery->pdata->info.voltage_max_design <= 2500000)
	88	val = (val * 78125UL) >> 7UL;
	89	else
	90	val = ((val * 924375UL) >> 9UL) + 33000;
	91	voltage = (long)val;
	92	} else {
	93	voltage = t ? t : -ETIMEDOUT;
	94	}
	95
	96	battery->cell->disable(battery->pdev);
	97	disable_irq(battery->irq);
	98
8ec98fe0 LPC	99	mutex_unlock(&battery->lock);
8ec98fe0 LPC	100
f6a21388 LPC	101	return voltage;
	102	}
	103
	104	static int jz_battery_get_capacity(struct power_supply *psy)
	105	{
	106	struct jz_battery *jz_battery = psy_to_jz_battery(psy);
	107	struct power_supply_info *info = &jz_battery->pdata->info;
	108	long voltage;
	109	int ret;
	110	int voltage_span;
	111
	112	voltage = jz_battery_read_voltage(jz_battery);
	113
	114	if (voltage < 0)
	115	return voltage;
	116
	117	voltage_span = info->voltage_max_design - info->voltage_min_design;
	118	ret = ((voltage - info->voltage_min_design) * 100) / voltage_span;
	119
	120	if (ret > 100)
	121	ret = 100;
	122	else if (ret < 0)
	123	ret = 0;
	124
	125	return ret;
	126	}
	127
	128	static int jz_battery_get_property(struct power_supply *psy,
	129	enum power_supply_property psp, union power_supply_propval *val)
	130	{
	131	struct jz_battery *jz_battery = psy_to_jz_battery(psy);
	132	struct power_supply_info *info = &jz_battery->pdata->info;
	133	long voltage;
	134
	135	switch (psp) {
	136	case POWER_SUPPLY_PROP_STATUS:
	137	val->intval = jz_battery->status;
	138	break;
	139	case POWER_SUPPLY_PROP_TECHNOLOGY:
	140	val->intval = jz_battery->pdata->info.technology;
	141	break;
	142	case POWER_SUPPLY_PROP_HEALTH:
	143	voltage = jz_battery_read_voltage(jz_battery);
	144	if (voltage < info->voltage_min_design)
	145	val->intval = POWER_SUPPLY_HEALTH_DEAD;
	146	else
	147	val->intval = POWER_SUPPLY_HEALTH_GOOD;
	148	break;
	149	case POWER_SUPPLY_PROP_CAPACITY:
	150	val->intval = jz_battery_get_capacity(psy);
	151	break;
	152	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
	153	val->intval = jz_battery_read_voltage(jz_battery);
	154	if (val->intval < 0)
	155	return val->intval;
	156	break;
	157	case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
	158	val->intval = info->voltage_max_design;
	159	break;
	160	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
	161	val->intval = info->voltage_min_design;
	162	break;
	163	case POWER_SUPPLY_PROP_PRESENT:
	164	val->intval = 1;
165	break;
166	default:
167	return -EINVAL;
168	}
169	return 0;
170	}
171
172	static void jz_battery_external_power_changed(struct power_supply *psy)
173	{
174	struct jz_battery *jz_battery = psy_to_jz_battery(psy);
175
41f63c53	176	mod_delayed_work(system_wq, &jz_battery->work, 0);
f6a21388 LPC	177	}
	178
	179	static irqreturn_t jz_battery_charge_irq(int irq, void *data)
	180	{
	181	struct jz_battery *jz_battery = data;
	182
41f63c53	183	mod_delayed_work(system_wq, &jz_battery->work, 0);
f6a21388 LPC	184
	185	return IRQ_HANDLED;
	186	}
	187
	188	static void jz_battery_update(struct jz_battery *jz_battery)
	189	{
	190	int status;
	191	long voltage;
	192	bool has_changed = false;
	193	int is_charging;
	194
	195	if (gpio_is_valid(jz_battery->pdata->gpio_charge)) {
	196	is_charging = gpio_get_value(jz_battery->pdata->gpio_charge);
	197	is_charging ^= jz_battery->pdata->gpio_charge_active_low;
	198	if (is_charging)
	199	status = POWER_SUPPLY_STATUS_CHARGING;
	200	else
	201	status = POWER_SUPPLY_STATUS_NOT_CHARGING;
	202
	203	if (status != jz_battery->status) {
	204	jz_battery->status = status;
	205	has_changed = true;
	206	}
	207	}
	208
	209	voltage = jz_battery_read_voltage(jz_battery);
	210	if (abs(voltage - jz_battery->voltage) < 50000) {
	211	jz_battery->voltage = voltage;
	212	has_changed = true;
	213	}
	214
	215	if (has_changed)
	216	power_supply_changed(&jz_battery->battery);
	217	}
	218
	219	static enum power_supply_property jz_battery_properties[] = {
	220	POWER_SUPPLY_PROP_STATUS,
	221	POWER_SUPPLY_PROP_TECHNOLOGY,
	222	POWER_SUPPLY_PROP_HEALTH,
	223	POWER_SUPPLY_PROP_CAPACITY,
	224	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	225	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
	226	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
	227	POWER_SUPPLY_PROP_PRESENT,
	228	};
	229
	230	static void jz_battery_work(struct work_struct *work)
	231	{
	232	/* Too small interval will increase system workload */
	233	const int interval = HZ * 30;
	234	struct jz_battery *jz_battery = container_of(work, struct jz_battery,
	235	work.work);
	236
	237	jz_battery_update(jz_battery);
	238	schedule_delayed_work(&jz_battery->work, interval);
	239	}
	240
c8afa640	241	static int jz_battery_probe(struct platform_device *pdev)
f6a21388 LPC	242	{
	243	int ret = 0;
	244	struct jz_battery_platform_data *pdata = pdev->dev.parent->platform_data;
	245	struct jz_battery *jz_battery;
	246	struct power_supply *battery;
	247
8477cedb LPC	248	if (!pdata) {
	249	dev_err(&pdev->dev, "No platform_data supplied\n");
	250	return -ENXIO;
	251	}
	252
f6a21388 LPC	253	jz_battery = kzalloc(sizeof(*jz_battery), GFP_KERNEL);
	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) {
	263	ret = jz_battery->irq;
	264	dev_err(&pdev->dev, "Failed to get platform irq: %d\n", ret);
	265	goto err_free;
	266	}
	267
	268	jz_battery->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	269	if (!jz_battery->mem) {
	270	ret = -ENOENT;
	271	dev_err(&pdev->dev, "Failed to get platform mmio resource\n");
	272	goto err_free;
	273	}
	274
	275	jz_battery->mem = request_mem_region(jz_battery->mem->start,
	276	resource_size(jz_battery->mem), pdev->name);
	277	if (!jz_battery->mem) {
	278	ret = -EBUSY;
	279	dev_err(&pdev->dev, "Failed to request mmio memory region\n");
	280	goto err_free;
	281	}
	282
	283	jz_battery->base = ioremap_nocache(jz_battery->mem->start,
	284	resource_size(jz_battery->mem));
	285	if (!jz_battery->base) {
	286	ret = -EBUSY;
	287	dev_err(&pdev->dev, "Failed to ioremap mmio memory\n");
	288	goto err_release_mem_region;
	289	}
	290
	291	battery = &jz_battery->battery;
	292	battery->name = pdata->info.name;
	293	battery->type = POWER_SUPPLY_TYPE_BATTERY;
	294	battery->properties = jz_battery_properties;
	295	battery->num_properties = ARRAY_SIZE(jz_battery_properties);
	296	battery->get_property = jz_battery_get_property;
	297	battery->external_power_changed = jz_battery_external_power_changed;
	298	battery->use_for_apm = 1;
	299
	300	jz_battery->pdata = pdata;
	301	jz_battery->pdev = pdev;
	302
	303	init_completion(&jz_battery->read_completion);
8ec98fe0	304	mutex_init(&jz_battery->lock);
f6a21388 LPC	305
	306	INIT_DELAYED_WORK(&jz_battery->work, jz_battery_work);
	307
	308	ret = request_irq(jz_battery->irq, jz_battery_irq_handler, 0, pdev->name,
	309	jz_battery);
	310	if (ret) {
	311	dev_err(&pdev->dev, "Failed to request irq %d\n", ret);
	312	goto err_iounmap;
	313	}
	314	disable_irq(jz_battery->irq);
	315
	316	if (gpio_is_valid(pdata->gpio_charge)) {
	317	ret = gpio_request(pdata->gpio_charge, dev_name(&pdev->dev));
	318	if (ret) {
	319	dev_err(&pdev->dev, "charger state gpio request failed.\n");
	320	goto err_free_irq;
	321	}
	322	ret = gpio_direction_input(pdata->gpio_charge);
	323	if (ret) {
	324	dev_err(&pdev->dev, "charger state gpio set direction failed.\n");
	325	goto err_free_gpio;
	326	}
	327
	328	jz_battery->charge_irq = gpio_to_irq(pdata->gpio_charge);
	329
	330	if (jz_battery->charge_irq >= 0) {
	331	ret = request_irq(jz_battery->charge_irq,
	332	jz_battery_charge_irq,
	333	IRQF_TRIGGER_RISING \| IRQF_TRIGGER_FALLING,
	334	dev_name(&pdev->dev), jz_battery);
	335	if (ret) {
	336	dev_err(&pdev->dev, "Failed to request charge irq: %d\n", ret);
	337	goto err_free_gpio;
	338	}
	339	}
	340	} else {
	341	jz_battery->charge_irq = -1;
	342	}
	343
	344	if (jz_battery->pdata->info.voltage_max_design <= 2500000)
	345	jz4740_adc_set_config(pdev->dev.parent, JZ_ADC_CONFIG_BAT_MB,
	346	JZ_ADC_CONFIG_BAT_MB);
	347	else
	348	jz4740_adc_set_config(pdev->dev.parent, JZ_ADC_CONFIG_BAT_MB, 0);
	349
	350	ret = power_supply_register(&pdev->dev, &jz_battery->battery);
	351	if (ret) {
	352	dev_err(&pdev->dev, "power supply battery register failed.\n");
	353	goto err_free_charge_irq;
	354	}
	355
	356	platform_set_drvdata(pdev, jz_battery);
	357	schedule_delayed_work(&jz_battery->work, 0);
	358
	359	return 0;
	360
	361	err_free_charge_irq:
	362	if (jz_battery->charge_irq >= 0)
	363	free_irq(jz_battery->charge_irq, jz_battery);
	364	err_free_gpio:
	365	if (gpio_is_valid(pdata->gpio_charge))
	366	gpio_free(jz_battery->pdata->gpio_charge);
	367	err_free_irq:
	368	free_irq(jz_battery->irq, jz_battery);
369	err_iounmap:
370	platform_set_drvdata(pdev, NULL);
371	iounmap(jz_battery->base);
372	err_release_mem_region:
373	release_mem_region(jz_battery->mem->start, resource_size(jz_battery->mem));
374	err_free:
375	kfree(jz_battery);
376	return ret;
377	}
378
415ec69f	379	static int jz_battery_remove(struct platform_device *pdev)
f6a21388 LPC	380	{
	381	struct jz_battery *jz_battery = platform_get_drvdata(pdev);
	382
	383	cancel_delayed_work_sync(&jz_battery->work);
	384
	385	if (gpio_is_valid(jz_battery->pdata->gpio_charge)) {
	386	if (jz_battery->charge_irq >= 0)
	387	free_irq(jz_battery->charge_irq, jz_battery);
	388	gpio_free(jz_battery->pdata->gpio_charge);
	389	}
	390
	391	power_supply_unregister(&jz_battery->battery);
	392
	393	free_irq(jz_battery->irq, jz_battery);
	394
	395	iounmap(jz_battery->base);
	396	release_mem_region(jz_battery->mem->start, resource_size(jz_battery->mem));
5f29895f	397	kfree(jz_battery);
f6a21388 LPC	398
	399	return 0;
	400	}
	401
	402	#ifdef CONFIG_PM
	403	static int jz_battery_suspend(struct device *dev)
	404	{
	405	struct jz_battery *jz_battery = dev_get_drvdata(dev);
	406
	407	cancel_delayed_work_sync(&jz_battery->work);
	408	jz_battery->status = POWER_SUPPLY_STATUS_UNKNOWN;
	409
	410	return 0;
	411	}
	412
	413	static int jz_battery_resume(struct device *dev)
	414	{
	415	struct jz_battery *jz_battery = dev_get_drvdata(dev);
	416
	417	schedule_delayed_work(&jz_battery->work, 0);
	418
	419	return 0;
	420	}
	421
	422	static const struct dev_pm_ops jz_battery_pm_ops = {
	423	.suspend = jz_battery_suspend,
	424	.resume = jz_battery_resume,
	425	};
	426
	427	#define JZ_BATTERY_PM_OPS (&jz_battery_pm_ops)
	428	#else
	429	#define JZ_BATTERY_PM_OPS NULL
	430	#endif
	431
	432	static struct platform_driver jz_battery_driver = {
	433	.probe = jz_battery_probe,
28ea73f4	434	.remove = jz_battery_remove,
f6a21388 LPC	435	.driver = {
	436	.name = "jz4740-battery",
	437	.owner = THIS_MODULE,
	438	.pm = JZ_BATTERY_PM_OPS,
	439	},
	440	};
	441
300bac7f	442	module_platform_driver(jz_battery_driver);
f6a21388 LPC	443
	444	MODULE_ALIAS("platform:jz4740-battery");
	445	MODULE_LICENSE("GPL");
	446	MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
	447	MODULE_DESCRIPTION("JZ4740 SoC battery driver");