drivers/power/s3c_adc_battery.c - maze/linux - Git at Google

 /*
  *	iPAQ h1930/h1940/rx1950 battery controller driver
  *	Copyright (c) Vasily Khoruzhick
  *	Based on h1940_battery.c by Arnaud Patard
  *
  * This file is subject to the terms and conditions of the GNU General Public
  * License.  See the file COPYING in the main directory of this archive for
  * more details.
  *
  */

 #include <linux/interrupt.h>
 #include <linux/platform_device.h>
 #include <linux/power_supply.h>
 #include <linux/leds.h>
 #include <linux/gpio.h>
 #include <linux/err.h>
 #include <linux/timer.h>
 #include <linux/jiffies.h>
 #include <linux/s3c_adc_battery.h>
 #include <linux/errno.h>
 #include <linux/init.h>

 #include <plat/adc.h>

 #define BAT_POLL_INTERVAL		10000 /* ms */
 #define JITTER_DELAY			500 /* ms */

 struct s3c_adc_bat {
 	struct power_supply		psy;
 	struct s3c_adc_client		*client;
 	struct s3c_adc_bat_pdata	*pdata;
 	int				volt_value;
 	int				cur_value;
 	unsigned int			timestamp;
 	int				level;
 	int				status;
 	int				cable_plugged:1;
 };

 static struct delayed_work bat_work;

 static void s3c_adc_bat_ext_power_changed(struct power_supply *psy)
 {
 	schedule_delayed_work(&bat_work,
 		msecs_to_jiffies(JITTER_DELAY));
 }

 static enum power_supply_property s3c_adc_backup_bat_props[] = {
 	POWER_SUPPLY_PROP_VOLTAGE_NOW,
 	POWER_SUPPLY_PROP_VOLTAGE_MIN,
 	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
 };

 static int s3c_adc_backup_bat_get_property(struct power_supply *psy,
 				enum power_supply_property psp,
 				union power_supply_propval *val)
 {
 	struct s3c_adc_bat *bat = container_of(psy, struct s3c_adc_bat, psy);

 	if (!bat) {
 		dev_err(psy->dev, "%s: no battery infos ?!\n", __func__);
 		return -EINVAL;
 	}

 	if (bat->volt_value < 0 ||
 		jiffies_to_msecs(jiffies - bat->timestamp) >
 			BAT_POLL_INTERVAL) {
 		bat->volt_value = s3c_adc_read(bat->client,
 			bat->pdata->backup_volt_channel);
 		bat->volt_value *= bat->pdata->backup_volt_mult;
 		bat->timestamp = jiffies;
 	}

 	switch (psp) {
 	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 		val->intval = bat->volt_value;
 		return 0;
 	case POWER_SUPPLY_PROP_VOLTAGE_MIN:
 		val->intval = bat->pdata->backup_volt_min;
 		return 0;
 	case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
 		val->intval = bat->pdata->backup_volt_max;
 		return 0;
 	default:
 		return -EINVAL;
 	}
 }

 static struct s3c_adc_bat backup_bat = {
 	.psy = {
 		.name		= "backup-battery",
 		.type		= POWER_SUPPLY_TYPE_BATTERY,
 		.properties	= s3c_adc_backup_bat_props,
 		.num_properties = ARRAY_SIZE(s3c_adc_backup_bat_props),
 		.get_property	= s3c_adc_backup_bat_get_property,
 		.use_for_apm	= 1,
 	},
 };

 static enum power_supply_property s3c_adc_main_bat_props[] = {
 	POWER_SUPPLY_PROP_STATUS,
 	POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 	POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN,
 	POWER_SUPPLY_PROP_CHARGE_NOW,
 	POWER_SUPPLY_PROP_VOLTAGE_NOW,
 	POWER_SUPPLY_PROP_CURRENT_NOW,
 };

 static int calc_full_volt(int volt_val, int cur_val, int impedance)
 {
 	return volt_val + cur_val * impedance / 1000;
 }

 static int s3c_adc_bat_get_property(struct power_supply *psy,
 				    enum power_supply_property psp,
 				    union power_supply_propval *val)
 {
 	struct s3c_adc_bat *bat = container_of(psy, struct s3c_adc_bat, psy);

 	int new_level;
 	int full_volt;
 	const struct s3c_adc_bat_thresh *lut = bat->pdata->lut_noac;
 	unsigned int lut_size = bat->pdata->lut_noac_cnt;

 	if (!bat) {
 		dev_err(psy->dev, "no battery infos ?!\n");
 		return -EINVAL;
 	}

 	if (bat->volt_value < 0 || bat->cur_value < 0 ||
 		jiffies_to_msecs(jiffies - bat->timestamp) >
 			BAT_POLL_INTERVAL) {
 		bat->volt_value = s3c_adc_read(bat->client,
 			bat->pdata->volt_channel) * bat->pdata->volt_mult;
 		bat->cur_value = s3c_adc_read(bat->client,
 			bat->pdata->current_channel) * bat->pdata->current_mult;
 		bat->timestamp = jiffies;
 	}

 	if (bat->cable_plugged &&
 		((bat->pdata->gpio_charge_finished < 0) ||
 		!gpio_get_value(bat->pdata->gpio_charge_finished))) {
 		lut = bat->pdata->lut_acin;
 		lut_size = bat->pdata->lut_acin_cnt;
 	}

 	new_level = 100000;
 	full_volt = calc_full_volt((bat->volt_value / 1000),
 		(bat->cur_value / 1000), bat->pdata->internal_impedance);

 	if (full_volt < calc_full_volt(lut->volt, lut->cur,
 		bat->pdata->internal_impedance)) {
 		lut_size--;
 		while (lut_size--) {
 			int lut_volt1;
 			int lut_volt2;

 			lut_volt1 = calc_full_volt(lut[0].volt, lut[0].cur,
 				bat->pdata->internal_impedance);
 			lut_volt2 = calc_full_volt(lut[1].volt, lut[1].cur,
 				bat->pdata->internal_impedance);
 			if (full_volt < lut_volt1 && full_volt >= lut_volt2) {
 				new_level = (lut[1].level +
 					(lut[0].level - lut[1].level) *
 					(full_volt - lut_volt2) /
 					(lut_volt1 - lut_volt2)) * 1000;
 				break;
 			}
 			new_level = lut[1].level * 1000;
 			lut++;
 		}
 	}

 	bat->level = new_level;

 	switch (psp) {
 	case POWER_SUPPLY_PROP_STATUS:
 		if (bat->pdata->gpio_charge_finished < 0)
 			val->intval = bat->level == 100000 ?
 				POWER_SUPPLY_STATUS_FULL : bat->status;
 		else
 			val->intval = bat->status;
 		return 0;
 	case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 		val->intval = 100000;
 		return 0;
 	case POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN:
 		val->intval = 0;
 		return 0;
 	case POWER_SUPPLY_PROP_CHARGE_NOW:
 		val->intval = bat->level;
 		return 0;
 	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 		val->intval = bat->volt_value;
 		return 0;
 	case POWER_SUPPLY_PROP_CURRENT_NOW:
 		val->intval = bat->cur_value;
 		return 0;
 	default:
 		return -EINVAL;
 	}
 }

 static struct s3c_adc_bat main_bat = {
 	.psy = {
 		.name			= "main-battery",
 		.type			= POWER_SUPPLY_TYPE_BATTERY,
 		.properties		= s3c_adc_main_bat_props,
 		.num_properties		= ARRAY_SIZE(s3c_adc_main_bat_props),
 		.get_property		= s3c_adc_bat_get_property,
 		.external_power_changed = s3c_adc_bat_ext_power_changed,
 		.use_for_apm		= 1,
 	},
 };

 static void s3c_adc_bat_work(struct work_struct *work)
 {
 	struct s3c_adc_bat *bat = &main_bat;
 	int is_charged;
 	int is_plugged;
 	static int was_plugged;

 	is_plugged = power_supply_am_i_supplied(&bat->psy);
 	bat->cable_plugged = is_plugged;
 	if (is_plugged != was_plugged) {
 		was_plugged = is_plugged;
 		if (is_plugged) {
 			if (bat->pdata->enable_charger)
 				bat->pdata->enable_charger();
 			bat->status = POWER_SUPPLY_STATUS_CHARGING;
 		} else {
 			if (bat->pdata->disable_charger)
 				bat->pdata->disable_charger();
 			bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
 		}
 	} else {
 		if ((bat->pdata->gpio_charge_finished >= 0) && is_plugged) {
 			is_charged = gpio_get_value(
 				main_bat.pdata->gpio_charge_finished);
 			if (is_charged) {
 				if (bat->pdata->disable_charger)
 					bat->pdata->disable_charger();
 				bat->status = POWER_SUPPLY_STATUS_FULL;
 			} else {
 				if (bat->pdata->enable_charger)
 					bat->pdata->enable_charger();
 				bat->status = POWER_SUPPLY_STATUS_CHARGING;
 			}
 		}
 	}

 	power_supply_changed(&bat->psy);
 }

 static irqreturn_t s3c_adc_bat_charged(int irq, void *dev_id)
 {
 	schedule_delayed_work(&bat_work,
 		msecs_to_jiffies(JITTER_DELAY));
 	return IRQ_HANDLED;
 }

 static int __init s3c_adc_bat_probe(struct platform_device *pdev)
 {
 	struct s3c_adc_client	*client;
 	struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;
 	int ret;

 	client = s3c_adc_register(pdev, NULL, NULL, 0);
 	if (IS_ERR(client)) {
 		dev_err(&pdev->dev, "cannot register adc\n");
 		return PTR_ERR(client);
 	}

 	platform_set_drvdata(pdev, client);

 	main_bat.client = client;
 	main_bat.pdata = pdata;
 	main_bat.volt_value = -1;
 	main_bat.cur_value = -1;
 	main_bat.cable_plugged = 0;
 	main_bat.status = POWER_SUPPLY_STATUS_DISCHARGING;

 	ret = power_supply_register(&pdev->dev, &main_bat.psy);
 	if (ret)
 		goto err_reg_main;
 	if (pdata->backup_volt_mult) {
 		backup_bat.client = client;
 		backup_bat.pdata = pdev->dev.platform_data;
 		backup_bat.volt_value = -1;
 		ret = power_supply_register(&pdev->dev, &backup_bat.psy);
 		if (ret)
 			goto err_reg_backup;
 	}

 	INIT_DELAYED_WORK(&bat_work, s3c_adc_bat_work);

 	if (pdata->gpio_charge_finished >= 0) {
 		ret = gpio_request(pdata->gpio_charge_finished, "charged");
 		if (ret)
 			goto err_gpio;

 		ret = request_irq(gpio_to_irq(pdata->gpio_charge_finished),
 				s3c_adc_bat_charged,
 				IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
 				"battery charged", NULL);
 		if (ret)
 			goto err_irq;
 	}

 	if (pdata->init) {
 		ret = pdata->init();
 		if (ret)
 			goto err_platform;
 	}

 	dev_info(&pdev->dev, "successfully loaded\n");
 	device_init_wakeup(&pdev->dev, 1);

 	/* Schedule timer to check current status */
 	schedule_delayed_work(&bat_work,
 		msecs_to_jiffies(JITTER_DELAY));

 	return 0;

 err_platform:
 	if (pdata->gpio_charge_finished >= 0)
 		free_irq(gpio_to_irq(pdata->gpio_charge_finished), NULL);
 err_irq:
 	if (pdata->gpio_charge_finished >= 0)
 		gpio_free(pdata->gpio_charge_finished);
 err_gpio:
 	if (pdata->backup_volt_mult)
 		power_supply_unregister(&backup_bat.psy);
 err_reg_backup:
 	power_supply_unregister(&main_bat.psy);
 err_reg_main:
 	return ret;
 }

 static int s3c_adc_bat_remove(struct platform_device *pdev)
 {
 	struct s3c_adc_client *client = platform_get_drvdata(pdev);
 	struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;

 	power_supply_unregister(&main_bat.psy);
 	if (pdata->backup_volt_mult)
 		power_supply_unregister(&backup_bat.psy);

 	s3c_adc_release(client);

 	if (pdata->gpio_charge_finished >= 0) {
 		free_irq(gpio_to_irq(pdata->gpio_charge_finished), NULL);
 		gpio_free(pdata->gpio_charge_finished);
 	}

 	cancel_delayed_work(&bat_work);

 	if (pdata->exit)
 		pdata->exit();

 	return 0;
 }

 #ifdef CONFIG_PM
 static int s3c_adc_bat_suspend(struct platform_device *pdev,
 	pm_message_t state)
 {
 	struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;

 	if (pdata->gpio_charge_finished >= 0) {
 		if (device_may_wakeup(&pdev->dev))
 			enable_irq_wake(
 				gpio_to_irq(pdata->gpio_charge_finished));
 		else {
 			disable_irq(gpio_to_irq(pdata->gpio_charge_finished));
 			main_bat.pdata->disable_charger();
 		}
 	}

 	return 0;
 }

 static int s3c_adc_bat_resume(struct platform_device *pdev)
 {
 	struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;

 	if (pdata->gpio_charge_finished >= 0) {
 		if (device_may_wakeup(&pdev->dev))
 			disable_irq_wake(
 				gpio_to_irq(pdata->gpio_charge_finished));
 		else
 			enable_irq(gpio_to_irq(pdata->gpio_charge_finished));
 	}

 	/* Schedule timer to check current status */
 	schedule_delayed_work(&bat_work,
 		msecs_to_jiffies(JITTER_DELAY));

 	return 0;
 }
 #else
 #define s3c_adc_battery_suspend NULL
 #define s3c_adc_battery_resume NULL
 #endif

 static struct platform_driver s3c_adc_bat_driver = {
 	.driver		= {
 		.name	= "s3c-adc-battery",
 	},
 	.probe		= s3c_adc_bat_probe,
 	.remove		= s3c_adc_bat_remove,
 	.suspend	= s3c_adc_bat_suspend,
 	.resume		= s3c_adc_bat_resume,
 };

 static int __init s3c_adc_bat_init(void)
 {
 	return platform_driver_register(&s3c_adc_bat_driver);
 }
 module_init(s3c_adc_bat_init);

 static void __exit s3c_adc_bat_exit(void)
 {
 	platform_driver_unregister(&s3c_adc_bat_driver);
 }
 module_exit(s3c_adc_bat_exit);

 MODULE_AUTHOR("Vasily Khoruzhick <anarsoul@gmail.com>");
 MODULE_DESCRIPTION("iPAQ H1930/H1940/RX1950 battery controller driver");
 MODULE_LICENSE("GPL");
	/*
	* iPAQ h1930/h1940/rx1950 battery controller driver
	* Copyright (c) Vasily Khoruzhick
	* Based on h1940_battery.c by Arnaud Patard
	*
	* This file is subject to the terms and conditions of the GNU General Public
	* License. See the file COPYING in the main directory of this archive for
	* more details.
	*
	*/

	#include <linux/interrupt.h>
	#include <linux/platform_device.h>
	#include <linux/power_supply.h>
	#include <linux/leds.h>
	#include <linux/gpio.h>
	#include <linux/err.h>
	#include <linux/timer.h>
	#include <linux/jiffies.h>
	#include <linux/s3c_adc_battery.h>
	#include <linux/errno.h>
	#include <linux/init.h>

	#include <plat/adc.h>

	#define BAT_POLL_INTERVAL 10000 /* ms */
	#define JITTER_DELAY 500 /* ms */

	struct s3c_adc_bat {
	struct power_supply psy;
	struct s3c_adc_client *client;
	struct s3c_adc_bat_pdata *pdata;
	int volt_value;
	int cur_value;
	unsigned int timestamp;
	int level;
	int status;
	int cable_plugged:1;
	};

	static struct delayed_work bat_work;

	static void s3c_adc_bat_ext_power_changed(struct power_supply *psy)
	{
	schedule_delayed_work(&bat_work,
	msecs_to_jiffies(JITTER_DELAY));
	}

	static enum power_supply_property s3c_adc_backup_bat_props[] = {
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_VOLTAGE_MIN,
	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
	};

	static int s3c_adc_backup_bat_get_property(struct power_supply *psy,
	enum power_supply_property psp,
	union power_supply_propval *val)
	{
	struct s3c_adc_bat *bat = container_of(psy, struct s3c_adc_bat, psy);

	if (!bat) {
	dev_err(psy->dev, "%s: no battery infos ?!\n", __func__);
	return -EINVAL;
	}

	if (bat->volt_value < 0 \|\|
	jiffies_to_msecs(jiffies - bat->timestamp) >
	BAT_POLL_INTERVAL) {
	bat->volt_value = s3c_adc_read(bat->client,
	bat->pdata->backup_volt_channel);
	bat->volt_value *= bat->pdata->backup_volt_mult;
	bat->timestamp = jiffies;
	}

	switch (psp) {
	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
	val->intval = bat->volt_value;
	return 0;
	case POWER_SUPPLY_PROP_VOLTAGE_MIN:
	val->intval = bat->pdata->backup_volt_min;
	return 0;
	case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
	val->intval = bat->pdata->backup_volt_max;
	return 0;
	default:
	return -EINVAL;
	}
	}

	static struct s3c_adc_bat backup_bat = {
	.psy = {
	.name = "backup-battery",
	.type = POWER_SUPPLY_TYPE_BATTERY,
	.properties = s3c_adc_backup_bat_props,
	.num_properties = ARRAY_SIZE(s3c_adc_backup_bat_props),
	.get_property = s3c_adc_backup_bat_get_property,
	.use_for_apm = 1,
	},
	};

	static enum power_supply_property s3c_adc_main_bat_props[] = {
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
	POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN,
	POWER_SUPPLY_PROP_CHARGE_NOW,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_CURRENT_NOW,
	};

	static int calc_full_volt(int volt_val, int cur_val, int impedance)
	{
	return volt_val + cur_val * impedance / 1000;
	}

	static int s3c_adc_bat_get_property(struct power_supply *psy,
	enum power_supply_property psp,
	union power_supply_propval *val)
	{
	struct s3c_adc_bat *bat = container_of(psy, struct s3c_adc_bat, psy);

	int new_level;
	int full_volt;
	const struct s3c_adc_bat_thresh *lut = bat->pdata->lut_noac;
	unsigned int lut_size = bat->pdata->lut_noac_cnt;

	if (!bat) {
	dev_err(psy->dev, "no battery infos ?!\n");
	return -EINVAL;
	}

	if (bat->volt_value < 0 \|\| bat->cur_value < 0 \|\|
	jiffies_to_msecs(jiffies - bat->timestamp) >
	BAT_POLL_INTERVAL) {
	bat->volt_value = s3c_adc_read(bat->client,
	bat->pdata->volt_channel) * bat->pdata->volt_mult;
	bat->cur_value = s3c_adc_read(bat->client,
	bat->pdata->current_channel) * bat->pdata->current_mult;
	bat->timestamp = jiffies;
	}

	if (bat->cable_plugged &&
	((bat->pdata->gpio_charge_finished < 0) \|\|
	!gpio_get_value(bat->pdata->gpio_charge_finished))) {
	lut = bat->pdata->lut_acin;
	lut_size = bat->pdata->lut_acin_cnt;
	}

	new_level = 100000;
	full_volt = calc_full_volt((bat->volt_value / 1000),
	(bat->cur_value / 1000), bat->pdata->internal_impedance);

	if (full_volt < calc_full_volt(lut->volt, lut->cur,
	bat->pdata->internal_impedance)) {
	lut_size--;
	while (lut_size--) {
	int lut_volt1;
	int lut_volt2;

	lut_volt1 = calc_full_volt(lut[0].volt, lut[0].cur,
	bat->pdata->internal_impedance);
	lut_volt2 = calc_full_volt(lut[1].volt, lut[1].cur,
	bat->pdata->internal_impedance);
	if (full_volt < lut_volt1 && full_volt >= lut_volt2) {
	new_level = (lut[1].level +
	(lut[0].level - lut[1].level) *
	(full_volt - lut_volt2) /
	(lut_volt1 - lut_volt2)) * 1000;
	break;
	}
	new_level = lut[1].level * 1000;
	lut++;
	}
	}

	bat->level = new_level;

	switch (psp) {
	case POWER_SUPPLY_PROP_STATUS:
	if (bat->pdata->gpio_charge_finished < 0)
	val->intval = bat->level == 100000 ?
	POWER_SUPPLY_STATUS_FULL : bat->status;
	else
	val->intval = bat->status;
	return 0;
	case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
	val->intval = 100000;
	return 0;
	case POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN:
	val->intval = 0;
	return 0;
	case POWER_SUPPLY_PROP_CHARGE_NOW:
	val->intval = bat->level;
	return 0;
	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
	val->intval = bat->volt_value;
	return 0;
	case POWER_SUPPLY_PROP_CURRENT_NOW:
	val->intval = bat->cur_value;
	return 0;
	default:
	return -EINVAL;
	}
	}

	static struct s3c_adc_bat main_bat = {
	.psy = {
	.name = "main-battery",
	.type = POWER_SUPPLY_TYPE_BATTERY,
	.properties = s3c_adc_main_bat_props,
	.num_properties = ARRAY_SIZE(s3c_adc_main_bat_props),
	.get_property = s3c_adc_bat_get_property,
	.external_power_changed = s3c_adc_bat_ext_power_changed,
	.use_for_apm = 1,
	},
	};

	static void s3c_adc_bat_work(struct work_struct *work)
	{
	struct s3c_adc_bat *bat = &main_bat;
	int is_charged;
	int is_plugged;
	static int was_plugged;

	is_plugged = power_supply_am_i_supplied(&bat->psy);
	bat->cable_plugged = is_plugged;
	if (is_plugged != was_plugged) {
	was_plugged = is_plugged;
	if (is_plugged) {
	if (bat->pdata->enable_charger)
	bat->pdata->enable_charger();
	bat->status = POWER_SUPPLY_STATUS_CHARGING;
	} else {
	if (bat->pdata->disable_charger)
	bat->pdata->disable_charger();
	bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
	}
	} else {
	if ((bat->pdata->gpio_charge_finished >= 0) && is_plugged) {
	is_charged = gpio_get_value(
	main_bat.pdata->gpio_charge_finished);
	if (is_charged) {
	if (bat->pdata->disable_charger)
	bat->pdata->disable_charger();
	bat->status = POWER_SUPPLY_STATUS_FULL;
	} else {
	if (bat->pdata->enable_charger)
	bat->pdata->enable_charger();
	bat->status = POWER_SUPPLY_STATUS_CHARGING;
	}
	}
	}

	power_supply_changed(&bat->psy);
	}

	static irqreturn_t s3c_adc_bat_charged(int irq, void *dev_id)
	{
	schedule_delayed_work(&bat_work,
	msecs_to_jiffies(JITTER_DELAY));
	return IRQ_HANDLED;
	}

	static int __init s3c_adc_bat_probe(struct platform_device *pdev)
	{
	struct s3c_adc_client *client;
	struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;
	int ret;

	client = s3c_adc_register(pdev, NULL, NULL, 0);
	if (IS_ERR(client)) {
	dev_err(&pdev->dev, "cannot register adc\n");
	return PTR_ERR(client);
	}

	platform_set_drvdata(pdev, client);

	main_bat.client = client;
	main_bat.pdata = pdata;
	main_bat.volt_value = -1;
	main_bat.cur_value = -1;
	main_bat.cable_plugged = 0;
	main_bat.status = POWER_SUPPLY_STATUS_DISCHARGING;

	ret = power_supply_register(&pdev->dev, &main_bat.psy);
	if (ret)
	goto err_reg_main;
	if (pdata->backup_volt_mult) {
	backup_bat.client = client;
	backup_bat.pdata = pdev->dev.platform_data;
	backup_bat.volt_value = -1;
	ret = power_supply_register(&pdev->dev, &backup_bat.psy);
	if (ret)
	goto err_reg_backup;
	}

	INIT_DELAYED_WORK(&bat_work, s3c_adc_bat_work);

	if (pdata->gpio_charge_finished >= 0) {
	ret = gpio_request(pdata->gpio_charge_finished, "charged");
	if (ret)
	goto err_gpio;

	ret = request_irq(gpio_to_irq(pdata->gpio_charge_finished),
	s3c_adc_bat_charged,
	IRQF_TRIGGER_RISING \| IRQF_TRIGGER_FALLING,
	"battery charged", NULL);
	if (ret)
	goto err_irq;
	}

	if (pdata->init) {
	ret = pdata->init();
	if (ret)
	goto err_platform;
	}

	dev_info(&pdev->dev, "successfully loaded\n");
	device_init_wakeup(&pdev->dev, 1);

	/* Schedule timer to check current status */
	schedule_delayed_work(&bat_work,
	msecs_to_jiffies(JITTER_DELAY));

	return 0;

	err_platform:
	if (pdata->gpio_charge_finished >= 0)
	free_irq(gpio_to_irq(pdata->gpio_charge_finished), NULL);
	err_irq:
	if (pdata->gpio_charge_finished >= 0)
	gpio_free(pdata->gpio_charge_finished);
	err_gpio:
	if (pdata->backup_volt_mult)
	power_supply_unregister(&backup_bat.psy);
	err_reg_backup:
	power_supply_unregister(&main_bat.psy);
	err_reg_main:
	return ret;
	}

	static int s3c_adc_bat_remove(struct platform_device *pdev)
	{
	struct s3c_adc_client *client = platform_get_drvdata(pdev);
	struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;

	power_supply_unregister(&main_bat.psy);
	if (pdata->backup_volt_mult)
	power_supply_unregister(&backup_bat.psy);

	s3c_adc_release(client);

	if (pdata->gpio_charge_finished >= 0) {
	free_irq(gpio_to_irq(pdata->gpio_charge_finished), NULL);
	gpio_free(pdata->gpio_charge_finished);
	}

	cancel_delayed_work(&bat_work);

	if (pdata->exit)
	pdata->exit();

	return 0;
	}

	#ifdef CONFIG_PM
	static int s3c_adc_bat_suspend(struct platform_device *pdev,
	pm_message_t state)
	{
	struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;

	if (pdata->gpio_charge_finished >= 0) {
	if (device_may_wakeup(&pdev->dev))
	enable_irq_wake(
	gpio_to_irq(pdata->gpio_charge_finished));
	else {
	disable_irq(gpio_to_irq(pdata->gpio_charge_finished));
	main_bat.pdata->disable_charger();
	}
	}

	return 0;
	}

	static int s3c_adc_bat_resume(struct platform_device *pdev)
	{
	struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;

	if (pdata->gpio_charge_finished >= 0) {
	if (device_may_wakeup(&pdev->dev))
	disable_irq_wake(
	gpio_to_irq(pdata->gpio_charge_finished));
	else
	enable_irq(gpio_to_irq(pdata->gpio_charge_finished));
	}

	/* Schedule timer to check current status */
	schedule_delayed_work(&bat_work,
	msecs_to_jiffies(JITTER_DELAY));

	return 0;
	}
	#else
	#define s3c_adc_battery_suspend NULL
	#define s3c_adc_battery_resume NULL
	#endif

	static struct platform_driver s3c_adc_bat_driver = {
	.driver = {
	.name = "s3c-adc-battery",
	},
	.probe = s3c_adc_bat_probe,
	.remove = s3c_adc_bat_remove,
	.suspend = s3c_adc_bat_suspend,
	.resume = s3c_adc_bat_resume,
	};

	static int __init s3c_adc_bat_init(void)
	{
	return platform_driver_register(&s3c_adc_bat_driver);
	}
	module_init(s3c_adc_bat_init);

	static void __exit s3c_adc_bat_exit(void)
	{
	platform_driver_unregister(&s3c_adc_bat_driver);
	}
	module_exit(s3c_adc_bat_exit);

	MODULE_AUTHOR("Vasily Khoruzhick <anarsoul@gmail.com>");
	MODULE_DESCRIPTION("iPAQ H1930/H1940/RX1950 battery controller driver");
	MODULE_LICENSE("GPL");