[net-next-2.6.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;
};

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;

	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);

	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;

	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);

	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;
	50	};
	51
	52	static inline struct jz_battery psy_to_jz_battery(struct power_supply psy)
	53	{
	54	return container_of(psy, struct jz_battery, battery);
	55	}
	56
	57	static irqreturn_t jz_battery_irq_handler(int irq, void *devid)
	58	{
	59	struct jz_battery *battery = devid;
	60
	61	complete(&battery->read_completion);
	62	return IRQ_HANDLED;
	63	}
	64
65	static long jz_battery_read_voltage(struct jz_battery *battery)
66	{
67	unsigned long t;
68	unsigned long val;
69	long voltage;
70
71	INIT_COMPLETION(battery->read_completion);
72
73	enable_irq(battery->irq);
74	battery->cell->enable(battery->pdev);
75
76	t = wait_for_completion_interruptible_timeout(&battery->read_completion,
77	HZ);
78
79	if (t > 0) {
80	val = readw(battery->base) & 0xfff;
81
82	if (battery->pdata->info.voltage_max_design <= 2500000)
83	val = (val * 78125UL) >> 7UL;
84	else
85	val = ((val * 924375UL) >> 9UL) + 33000;
86	voltage = (long)val;
87	} else {
88	voltage = t ? t : -ETIMEDOUT;
89	}
90
91	battery->cell->disable(battery->pdev);
92	disable_irq(battery->irq);
93
94	return voltage;
95	}
96
97	static int jz_battery_get_capacity(struct power_supply *psy)
98	{
99	struct jz_battery *jz_battery = psy_to_jz_battery(psy);
100	struct power_supply_info *info = &jz_battery->pdata->info;
101	long voltage;
102	int ret;
103	int voltage_span;
104
105	voltage = jz_battery_read_voltage(jz_battery);
106
107	if (voltage < 0)
108	return voltage;
109
110	voltage_span = info->voltage_max_design - info->voltage_min_design;
111	ret = ((voltage - info->voltage_min_design) * 100) / voltage_span;
112
113	if (ret > 100)
114	ret = 100;
115	else if (ret < 0)
116	ret = 0;
117
118	return ret;
119	}
120
121	static int jz_battery_get_property(struct power_supply *psy,
122	enum power_supply_property psp, union power_supply_propval *val)
123	{
124	struct jz_battery *jz_battery = psy_to_jz_battery(psy);
125	struct power_supply_info *info = &jz_battery->pdata->info;
126	long voltage;
127
128	switch (psp) {
129	case POWER_SUPPLY_PROP_STATUS:
130	val->intval = jz_battery->status;
131	break;
132	case POWER_SUPPLY_PROP_TECHNOLOGY:
133	val->intval = jz_battery->pdata->info.technology;
134	break;
135	case POWER_SUPPLY_PROP_HEALTH:
136	voltage = jz_battery_read_voltage(jz_battery);
137	if (voltage < info->voltage_min_design)
138	val->intval = POWER_SUPPLY_HEALTH_DEAD;
139	else
140	val->intval = POWER_SUPPLY_HEALTH_GOOD;
141	break;
142	case POWER_SUPPLY_PROP_CAPACITY:
143	val->intval = jz_battery_get_capacity(psy);
144	break;
145	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
146	val->intval = jz_battery_read_voltage(jz_battery);
147	if (val->intval < 0)
148	return val->intval;
149	break;
150	case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
151	val->intval = info->voltage_max_design;
152	break;
153	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
154	val->intval = info->voltage_min_design;
155	break;
156	case POWER_SUPPLY_PROP_PRESENT:
157	val->intval = 1;
158	break;
159	default:
160	return -EINVAL;
161	}
162	return 0;
163	}
164
165	static void jz_battery_external_power_changed(struct power_supply *psy)
166	{
167	struct jz_battery *jz_battery = psy_to_jz_battery(psy);
168
169	cancel_delayed_work(&jz_battery->work);
170	schedule_delayed_work(&jz_battery->work, 0);
171	}
172
173	static irqreturn_t jz_battery_charge_irq(int irq, void *data)
174	{
175	struct jz_battery *jz_battery = data;
176
177	cancel_delayed_work(&jz_battery->work);
178	schedule_delayed_work(&jz_battery->work, 0);
179
180	return IRQ_HANDLED;
181	}
182
183	static void jz_battery_update(struct jz_battery *jz_battery)
184	{
185	int status;
186	long voltage;
187	bool has_changed = false;
188	int is_charging;
189
190	if (gpio_is_valid(jz_battery->pdata->gpio_charge)) {
191	is_charging = gpio_get_value(jz_battery->pdata->gpio_charge);
192	is_charging ^= jz_battery->pdata->gpio_charge_active_low;
193	if (is_charging)
194	status = POWER_SUPPLY_STATUS_CHARGING;
195	else
196	status = POWER_SUPPLY_STATUS_NOT_CHARGING;
197
198	if (status != jz_battery->status) {
199	jz_battery->status = status;
200	has_changed = true;
201	}
202	}
203
204	voltage = jz_battery_read_voltage(jz_battery);
205	if (abs(voltage - jz_battery->voltage) < 50000) {
206	jz_battery->voltage = voltage;
207	has_changed = true;
208	}
209
210	if (has_changed)
211	power_supply_changed(&jz_battery->battery);
212	}
213
214	static enum power_supply_property jz_battery_properties[] = {
215	POWER_SUPPLY_PROP_STATUS,
216	POWER_SUPPLY_PROP_TECHNOLOGY,
217	POWER_SUPPLY_PROP_HEALTH,
218	POWER_SUPPLY_PROP_CAPACITY,
219	POWER_SUPPLY_PROP_VOLTAGE_NOW,
220	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
221	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
222	POWER_SUPPLY_PROP_PRESENT,
223	};
224
225	static void jz_battery_work(struct work_struct *work)
226	{
227	/* Too small interval will increase system workload */
228	const int interval = HZ * 30;
229	struct jz_battery *jz_battery = container_of(work, struct jz_battery,
230	work.work);
231
232	jz_battery_update(jz_battery);
233	schedule_delayed_work(&jz_battery->work, interval);
234	}
235
236	static int __devinit jz_battery_probe(struct platform_device *pdev)
237	{
238	int ret = 0;
239	struct jz_battery_platform_data *pdata = pdev->dev.parent->platform_data;
240	struct jz_battery *jz_battery;
241	struct power_supply *battery;
242
243	jz_battery = kzalloc(sizeof(*jz_battery), GFP_KERNEL);
244	if (!jz_battery) {
245	dev_err(&pdev->dev, "Failed to allocate driver structure\n");
246	return -ENOMEM;
247	}
248
249	jz_battery->cell = pdev->dev.platform_data;
250
251	jz_battery->irq = platform_get_irq(pdev, 0);
252	if (jz_battery->irq < 0) {
253	ret = jz_battery->irq;
254	dev_err(&pdev->dev, "Failed to get platform irq: %d\n", ret);
255	goto err_free;
256	}
257
258	jz_battery->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
259	if (!jz_battery->mem) {
260	ret = -ENOENT;
261	dev_err(&pdev->dev, "Failed to get platform mmio resource\n");
262	goto err_free;
263	}
264
265	jz_battery->mem = request_mem_region(jz_battery->mem->start,
266	resource_size(jz_battery->mem), pdev->name);
267	if (!jz_battery->mem) {
268	ret = -EBUSY;
269	dev_err(&pdev->dev, "Failed to request mmio memory region\n");
270	goto err_free;
271	}
272
273	jz_battery->base = ioremap_nocache(jz_battery->mem->start,
274	resource_size(jz_battery->mem));
275	if (!jz_battery->base) {
276	ret = -EBUSY;
277	dev_err(&pdev->dev, "Failed to ioremap mmio memory\n");
278	goto err_release_mem_region;
279	}
280
281	battery = &jz_battery->battery;
282	battery->name = pdata->info.name;
283	battery->type = POWER_SUPPLY_TYPE_BATTERY;
284	battery->properties = jz_battery_properties;
285	battery->num_properties = ARRAY_SIZE(jz_battery_properties);
286	battery->get_property = jz_battery_get_property;
287	battery->external_power_changed = jz_battery_external_power_changed;
288	battery->use_for_apm = 1;
289
290	jz_battery->pdata = pdata;
291	jz_battery->pdev = pdev;
292
293	init_completion(&jz_battery->read_completion);
294
295	INIT_DELAYED_WORK(&jz_battery->work, jz_battery_work);
296
297	ret = request_irq(jz_battery->irq, jz_battery_irq_handler, 0, pdev->name,
298	jz_battery);
299	if (ret) {
300	dev_err(&pdev->dev, "Failed to request irq %d\n", ret);
301	goto err_iounmap;
302	}
303	disable_irq(jz_battery->irq);
304
305	if (gpio_is_valid(pdata->gpio_charge)) {
306	ret = gpio_request(pdata->gpio_charge, dev_name(&pdev->dev));
307	if (ret) {
308	dev_err(&pdev->dev, "charger state gpio request failed.\n");
309	goto err_free_irq;
310	}
311	ret = gpio_direction_input(pdata->gpio_charge);
312	if (ret) {
313	dev_err(&pdev->dev, "charger state gpio set direction failed.\n");
314	goto err_free_gpio;
315	}
316
317	jz_battery->charge_irq = gpio_to_irq(pdata->gpio_charge);
318
319	if (jz_battery->charge_irq >= 0) {
320	ret = request_irq(jz_battery->charge_irq,
321	jz_battery_charge_irq,
322	IRQF_TRIGGER_RISING \| IRQF_TRIGGER_FALLING,
323	dev_name(&pdev->dev), jz_battery);
324	if (ret) {
325	dev_err(&pdev->dev, "Failed to request charge irq: %d\n", ret);
326	goto err_free_gpio;
327	}
328	}
329	} else {
330	jz_battery->charge_irq = -1;
331	}
332
333	if (jz_battery->pdata->info.voltage_max_design <= 2500000)
334	jz4740_adc_set_config(pdev->dev.parent, JZ_ADC_CONFIG_BAT_MB,
335	JZ_ADC_CONFIG_BAT_MB);
336	else
337	jz4740_adc_set_config(pdev->dev.parent, JZ_ADC_CONFIG_BAT_MB, 0);
338
339	ret = power_supply_register(&pdev->dev, &jz_battery->battery);
340	if (ret) {
341	dev_err(&pdev->dev, "power supply battery register failed.\n");
342	goto err_free_charge_irq;
343	}
344
345	platform_set_drvdata(pdev, jz_battery);
346	schedule_delayed_work(&jz_battery->work, 0);
347
348	return 0;
349
350	err_free_charge_irq:
351	if (jz_battery->charge_irq >= 0)
352	free_irq(jz_battery->charge_irq, jz_battery);
353	err_free_gpio:
354	if (gpio_is_valid(pdata->gpio_charge))
355	gpio_free(jz_battery->pdata->gpio_charge);
356	err_free_irq:
357	free_irq(jz_battery->irq, jz_battery);
358	err_iounmap:
359	platform_set_drvdata(pdev, NULL);
360	iounmap(jz_battery->base);
361	err_release_mem_region:
362	release_mem_region(jz_battery->mem->start, resource_size(jz_battery->mem));
363	err_free:
364	kfree(jz_battery);
365	return ret;
366	}
367
368	static int __devexit jz_battery_remove(struct platform_device *pdev)
369	{
370	struct jz_battery *jz_battery = platform_get_drvdata(pdev);
371
372	cancel_delayed_work_sync(&jz_battery->work);
373
374	if (gpio_is_valid(jz_battery->pdata->gpio_charge)) {
375	if (jz_battery->charge_irq >= 0)
376	free_irq(jz_battery->charge_irq, jz_battery);
377	gpio_free(jz_battery->pdata->gpio_charge);
378	}
379
380	power_supply_unregister(&jz_battery->battery);
381
382	free_irq(jz_battery->irq, jz_battery);
383
384	iounmap(jz_battery->base);
385	release_mem_region(jz_battery->mem->start, resource_size(jz_battery->mem));
5f29895f	386	kfree(jz_battery);
f6a21388 LPC	387
	388	return 0;
	389	}
	390
	391	#ifdef CONFIG_PM
	392	static int jz_battery_suspend(struct device *dev)
	393	{
	394	struct jz_battery *jz_battery = dev_get_drvdata(dev);
	395
	396	cancel_delayed_work_sync(&jz_battery->work);
	397	jz_battery->status = POWER_SUPPLY_STATUS_UNKNOWN;
	398
	399	return 0;
	400	}
	401
	402	static int jz_battery_resume(struct device *dev)
	403	{
	404	struct jz_battery *jz_battery = dev_get_drvdata(dev);
	405
	406	schedule_delayed_work(&jz_battery->work, 0);
	407
	408	return 0;
	409	}
	410
	411	static const struct dev_pm_ops jz_battery_pm_ops = {
	412	.suspend = jz_battery_suspend,
	413	.resume = jz_battery_resume,
	414	};
	415
	416	#define JZ_BATTERY_PM_OPS (&jz_battery_pm_ops)
	417	#else
	418	#define JZ_BATTERY_PM_OPS NULL
	419	#endif
	420
	421	static struct platform_driver jz_battery_driver = {
	422	.probe = jz_battery_probe,
	423	.remove = __devexit_p(jz_battery_remove),
	424	.driver = {
	425	.name = "jz4740-battery",
	426	.owner = THIS_MODULE,
	427	.pm = JZ_BATTERY_PM_OPS,
	428	},
	429	};
	430
	431	static int __init jz_battery_init(void)
	432	{
	433	return platform_driver_register(&jz_battery_driver);
	434	}
	435	module_init(jz_battery_init);
	436
	437	static void __exit jz_battery_exit(void)
	438	{
	439	platform_driver_unregister(&jz_battery_driver);
	440	}
	441	module_exit(jz_battery_exit);
	442
	443	MODULE_ALIAS("platform:jz4740-battery");
	444	MODULE_LICENSE("GPL");
	445	MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
	446	MODULE_DESCRIPTION("JZ4740 SoC battery driver");