drivers/power/pda_power.c - arm/linux - Git at Google

 /*
  * Common power driver for PDAs and phones with one or two external
  * power supplies (AC/USB) connected to main and backup batteries,
  * and optional builtin charger.
  *
  * Copyright © 2007 Anton Vorontsov <cbou@mail.ru>
  *
  * 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/module.h>
 #include <linux/platform_device.h>
 #include <linux/err.h>
 #include <linux/interrupt.h>
 #include <linux/notifier.h>
 #include <linux/power_supply.h>
 #include <linux/pda_power.h>
 #include <linux/regulator/consumer.h>
 #include <linux/timer.h>
 #include <linux/jiffies.h>
 #include <linux/usb/otg.h>

 static inline unsigned int get_irq_flags(struct resource *res)
 {
 	unsigned int flags = IRQF_SAMPLE_RANDOM | IRQF_SHARED;

 	flags |= res->flags & IRQF_TRIGGER_MASK;

 	return flags;
 }

 static struct device *dev;
 static struct pda_power_pdata *pdata;
 static struct resource *ac_irq, *usb_irq;
 static struct timer_list charger_timer;
 static struct timer_list supply_timer;
 static struct timer_list polling_timer;
 static int polling;

 #ifdef CONFIG_USB_OTG_UTILS
 static struct usb_phy *transceiver;
 static struct notifier_block otg_nb;
 #endif

 static struct regulator *ac_draw;

 enum {
 	PDA_PSY_OFFLINE = 0,
 	PDA_PSY_ONLINE = 1,
 	PDA_PSY_TO_CHANGE,
 };
 static int new_ac_status = -1;
 static int new_usb_status = -1;
 static int ac_status = -1;
 static int usb_status = -1;

 static int pda_power_get_property(struct power_supply *psy,
 				  enum power_supply_property psp,
 				  union power_supply_propval *val)
 {
 	switch (psp) {
 	case POWER_SUPPLY_PROP_ONLINE:
 		if (psy->type == POWER_SUPPLY_TYPE_MAINS)
 			val->intval = pdata->is_ac_online ?
 				      pdata->is_ac_online() : 0;
 		else
 			val->intval = pdata->is_usb_online ?
 				      pdata->is_usb_online() : 0;
 		break;
 	default:
 		return -EINVAL;
 	}
 	return 0;
 }

 static enum power_supply_property pda_power_props[] = {
 	POWER_SUPPLY_PROP_ONLINE,
 };

 static char *pda_power_supplied_to[] = {
 	"main-battery",
 	"backup-battery",
 };

 static struct power_supply pda_psy_ac = {
 	.name = "ac",
 	.type = POWER_SUPPLY_TYPE_MAINS,
 	.supplied_to = pda_power_supplied_to,
 	.num_supplicants = ARRAY_SIZE(pda_power_supplied_to),
 	.properties = pda_power_props,
 	.num_properties = ARRAY_SIZE(pda_power_props),
 	.get_property = pda_power_get_property,
 };

 static struct power_supply pda_psy_usb = {
 	.name = "usb",
 	.type = POWER_SUPPLY_TYPE_USB,
 	.supplied_to = pda_power_supplied_to,
 	.num_supplicants = ARRAY_SIZE(pda_power_supplied_to),
 	.properties = pda_power_props,
 	.num_properties = ARRAY_SIZE(pda_power_props),
 	.get_property = pda_power_get_property,
 };

 static void update_status(void)
 {
 	if (pdata->is_ac_online)
 		new_ac_status = !!pdata->is_ac_online();

 	if (pdata->is_usb_online)
 		new_usb_status = !!pdata->is_usb_online();
 }

 static void update_charger(void)
 {
 	static int regulator_enabled;
 	int max_uA = pdata->ac_max_uA;

 	if (pdata->set_charge) {
 		if (new_ac_status > 0) {
 			dev_dbg(dev, "charger on (AC)\n");
 			pdata->set_charge(PDA_POWER_CHARGE_AC);
 		} else if (new_usb_status > 0) {
 			dev_dbg(dev, "charger on (USB)\n");
 			pdata->set_charge(PDA_POWER_CHARGE_USB);
 		} else {
 			dev_dbg(dev, "charger off\n");
 			pdata->set_charge(0);
 		}
 	} else if (ac_draw) {
 		if (new_ac_status > 0) {
 			regulator_set_current_limit(ac_draw, max_uA, max_uA);
 			if (!regulator_enabled) {
 				dev_dbg(dev, "charger on (AC)\n");
 				regulator_enable(ac_draw);
 				regulator_enabled = 1;
 			}
 		} else {
 			if (regulator_enabled) {
 				dev_dbg(dev, "charger off\n");
 				regulator_disable(ac_draw);
 				regulator_enabled = 0;
 			}
 		}
 	}
 }

 static void supply_timer_func(unsigned long unused)
 {
 	if (ac_status == PDA_PSY_TO_CHANGE) {
 		ac_status = new_ac_status;
 		power_supply_changed(&pda_psy_ac);
 	}

 	if (usb_status == PDA_PSY_TO_CHANGE) {
 		usb_status = new_usb_status;
 		power_supply_changed(&pda_psy_usb);
 	}
 }

 static void psy_changed(void)
 {
 	update_charger();

 	/*
 	 * Okay, charger set. Now wait a bit before notifying supplicants,
 	 * charge power should stabilize.
 	 */
 	mod_timer(&supply_timer,
 		  jiffies + msecs_to_jiffies(pdata->wait_for_charger));
 }

 static void charger_timer_func(unsigned long unused)
 {
 	update_status();
 	psy_changed();
 }

 static irqreturn_t power_changed_isr(int irq, void *power_supply)
 {
 	if (power_supply == &pda_psy_ac)
 		ac_status = PDA_PSY_TO_CHANGE;
 	else if (power_supply == &pda_psy_usb)
 		usb_status = PDA_PSY_TO_CHANGE;
 	else
 		return IRQ_NONE;

 	/*
 	 * Wait a bit before reading ac/usb line status and setting charger,
 	 * because ac/usb status readings may lag from irq.
 	 */
 	mod_timer(&charger_timer,
 		  jiffies + msecs_to_jiffies(pdata->wait_for_status));

 	return IRQ_HANDLED;
 }

 static void polling_timer_func(unsigned long unused)
 {
 	int changed = 0;

 	dev_dbg(dev, "polling...\n");

 	update_status();

 	if (!ac_irq && new_ac_status != ac_status) {
 		ac_status = PDA_PSY_TO_CHANGE;
 		changed = 1;
 	}

 	if (!usb_irq && new_usb_status != usb_status) {
 		usb_status = PDA_PSY_TO_CHANGE;
 		changed = 1;
 	}

 	if (changed)
 		psy_changed();

 	mod_timer(&polling_timer,
 		  jiffies + msecs_to_jiffies(pdata->polling_interval));
 }

 #ifdef CONFIG_USB_OTG_UTILS
 static int otg_is_usb_online(void)
 {
 	return (transceiver->last_event == USB_EVENT_VBUS ||
 		transceiver->last_event == USB_EVENT_ENUMERATED);
 }

 static int otg_is_ac_online(void)
 {
 	return (transceiver->last_event == USB_EVENT_CHARGER);
 }

 static int otg_handle_notification(struct notifier_block *nb,
 		unsigned long event, void *unused)
 {
 	switch (event) {
 	case USB_EVENT_CHARGER:
 		ac_status = PDA_PSY_TO_CHANGE;
 		break;
 	case USB_EVENT_VBUS:
 	case USB_EVENT_ENUMERATED:
 		usb_status = PDA_PSY_TO_CHANGE;
 		break;
 	case USB_EVENT_NONE:
 		ac_status = PDA_PSY_TO_CHANGE;
 		usb_status = PDA_PSY_TO_CHANGE;
 		break;
 	default:
 		return NOTIFY_OK;
 	}

 	/*
 	 * Wait a bit before reading ac/usb line status and setting charger,
 	 * because ac/usb status readings may lag from irq.
 	 */
 	mod_timer(&charger_timer,
 		  jiffies + msecs_to_jiffies(pdata->wait_for_status));

 	return NOTIFY_OK;
 }
 #endif

 static int pda_power_probe(struct platform_device *pdev)
 {
 	int ret = 0;

 	dev = &pdev->dev;

 	if (pdev->id != -1) {
 		dev_err(dev, "it's meaningless to register several "
 			"pda_powers; use id = -1\n");
 		ret = -EINVAL;
 		goto wrongid;
 	}

 	pdata = pdev->dev.platform_data;

 	if (pdata->init) {
 		ret = pdata->init(dev);
 		if (ret < 0)
 			goto init_failed;
 	}

 	update_status();
 	update_charger();

 	if (!pdata->wait_for_status)
 		pdata->wait_for_status = 500;

 	if (!pdata->wait_for_charger)
 		pdata->wait_for_charger = 500;

 	if (!pdata->polling_interval)
 		pdata->polling_interval = 2000;

 	if (!pdata->ac_max_uA)
 		pdata->ac_max_uA = 500000;

 	setup_timer(&charger_timer, charger_timer_func, 0);
 	setup_timer(&supply_timer, supply_timer_func, 0);

 	ac_irq = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "ac");
 	usb_irq = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "usb");

 	if (pdata->supplied_to) {
 		pda_psy_ac.supplied_to = pdata->supplied_to;
 		pda_psy_ac.num_supplicants = pdata->num_supplicants;
 		pda_psy_usb.supplied_to = pdata->supplied_to;
 		pda_psy_usb.num_supplicants = pdata->num_supplicants;
 	}

 	ac_draw = regulator_get(dev, "ac_draw");
 	if (IS_ERR(ac_draw)) {
 		dev_dbg(dev, "couldn't get ac_draw regulator\n");
 		ac_draw = NULL;
 		ret = PTR_ERR(ac_draw);
 	}

 #ifdef CONFIG_USB_OTG_UTILS
 	transceiver = usb_get_phy(USB_PHY_TYPE_USB2);
 	if (!IS_ERR_OR_NULL(transceiver)) {
 		if (!pdata->is_usb_online)
 			pdata->is_usb_online = otg_is_usb_online;
 		if (!pdata->is_ac_online)
 			pdata->is_ac_online = otg_is_ac_online;
 	}
 #endif

 	if (pdata->is_ac_online) {
 		ret = power_supply_register(&pdev->dev, &pda_psy_ac);
 		if (ret) {
 			dev_err(dev, "failed to register %s power supply\n",
 				pda_psy_ac.name);
 			goto ac_supply_failed;
 		}

 		if (ac_irq) {
 			ret = request_irq(ac_irq->start, power_changed_isr,
 					  get_irq_flags(ac_irq), ac_irq->name,
 					  &pda_psy_ac);
 			if (ret) {
 				dev_err(dev, "request ac irq failed\n");
 				goto ac_irq_failed;
 			}
 		} else {
 			polling = 1;
 		}
 	}

 	if (pdata->is_usb_online) {
 		ret = power_supply_register(&pdev->dev, &pda_psy_usb);
 		if (ret) {
 			dev_err(dev, "failed to register %s power supply\n",
 				pda_psy_usb.name);
 			goto usb_supply_failed;
 		}

 		if (usb_irq) {
 			ret = request_irq(usb_irq->start, power_changed_isr,
 					  get_irq_flags(usb_irq),
 					  usb_irq->name, &pda_psy_usb);
 			if (ret) {
 				dev_err(dev, "request usb irq failed\n");
 				goto usb_irq_failed;
 			}
 		} else {
 			polling = 1;
 		}
 	}

 #ifdef CONFIG_USB_OTG_UTILS
 	if (!IS_ERR_OR_NULL(transceiver) && pdata->use_otg_notifier) {
 		otg_nb.notifier_call = otg_handle_notification;
 		ret = usb_register_notifier(transceiver, &otg_nb);
 		if (ret) {
 			dev_err(dev, "failure to register otg notifier\n");
 			goto otg_reg_notifier_failed;
 		}
 		polling = 0;
 	}
 #endif

 	if (polling) {
 		dev_dbg(dev, "will poll for status\n");
 		setup_timer(&polling_timer, polling_timer_func, 0);
 		mod_timer(&polling_timer,
 			  jiffies + msecs_to_jiffies(pdata->polling_interval));
 	}

 	if (ac_irq || usb_irq)
 		device_init_wakeup(&pdev->dev, 1);

 	return 0;

 #ifdef CONFIG_USB_OTG_UTILS
 otg_reg_notifier_failed:
 	if (pdata->is_usb_online && usb_irq)
 		free_irq(usb_irq->start, &pda_psy_usb);
 #endif
 usb_irq_failed:
 	if (pdata->is_usb_online)
 		power_supply_unregister(&pda_psy_usb);
 usb_supply_failed:
 	if (pdata->is_ac_online && ac_irq)
 		free_irq(ac_irq->start, &pda_psy_ac);
 #ifdef CONFIG_USB_OTG_UTILS
 	if (!IS_ERR_OR_NULL(transceiver))
 		usb_put_phy(transceiver);
 #endif
 ac_irq_failed:
 	if (pdata->is_ac_online)
 		power_supply_unregister(&pda_psy_ac);
 ac_supply_failed:
 	if (ac_draw) {
 		regulator_put(ac_draw);
 		ac_draw = NULL;
 	}
 	if (pdata->exit)
 		pdata->exit(dev);
 init_failed:
 wrongid:
 	return ret;
 }

 static int pda_power_remove(struct platform_device *pdev)
 {
 	if (pdata->is_usb_online && usb_irq)
 		free_irq(usb_irq->start, &pda_psy_usb);
 	if (pdata->is_ac_online && ac_irq)
 		free_irq(ac_irq->start, &pda_psy_ac);

 	if (polling)
 		del_timer_sync(&polling_timer);
 	del_timer_sync(&charger_timer);
 	del_timer_sync(&supply_timer);

 	if (pdata->is_usb_online)
 		power_supply_unregister(&pda_psy_usb);
 	if (pdata->is_ac_online)
 		power_supply_unregister(&pda_psy_ac);
 #ifdef CONFIG_USB_OTG_UTILS
 	if (!IS_ERR_OR_NULL(transceiver))
 		usb_put_phy(transceiver);
 #endif
 	if (ac_draw) {
 		regulator_put(ac_draw);
 		ac_draw = NULL;
 	}
 	if (pdata->exit)
 		pdata->exit(dev);

 	return 0;
 }

 #ifdef CONFIG_PM
 static int ac_wakeup_enabled;
 static int usb_wakeup_enabled;

 static int pda_power_suspend(struct platform_device *pdev, pm_message_t state)
 {
 	if (pdata->suspend) {
 		int ret = pdata->suspend(state);

 		if (ret)
 			return ret;
 	}

 	if (device_may_wakeup(&pdev->dev)) {
 		if (ac_irq)
 			ac_wakeup_enabled = !enable_irq_wake(ac_irq->start);
 		if (usb_irq)
 			usb_wakeup_enabled = !enable_irq_wake(usb_irq->start);
 	}

 	return 0;
 }

 static int pda_power_resume(struct platform_device *pdev)
 {
 	if (device_may_wakeup(&pdev->dev)) {
 		if (usb_irq && usb_wakeup_enabled)
 			disable_irq_wake(usb_irq->start);
 		if (ac_irq && ac_wakeup_enabled)
 			disable_irq_wake(ac_irq->start);
 	}

 	if (pdata->resume)
 		return pdata->resume();

 	return 0;
 }
 #else
 #define pda_power_suspend NULL
 #define pda_power_resume NULL
 #endif /* CONFIG_PM */

 static struct platform_driver pda_power_pdrv = {
 	.driver = {
 		.name = "pda-power",
 	},
 	.probe = pda_power_probe,
 	.remove = pda_power_remove,
 	.suspend = pda_power_suspend,
 	.resume = pda_power_resume,
 };

 module_platform_driver(pda_power_pdrv);

 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Anton Vorontsov <cbou@mail.ru>");
 MODULE_ALIAS("platform:pda-power");
	/*
	* Common power driver for PDAs and phones with one or two external
	* power supplies (AC/USB) connected to main and backup batteries,
	* and optional builtin charger.
	*
	* Copyright © 2007 Anton Vorontsov <cbou@mail.ru>
	*
	* 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/module.h>
	#include <linux/platform_device.h>
	#include <linux/err.h>
	#include <linux/interrupt.h>
	#include <linux/notifier.h>
	#include <linux/power_supply.h>
	#include <linux/pda_power.h>
	#include <linux/regulator/consumer.h>
	#include <linux/timer.h>
	#include <linux/jiffies.h>
	#include <linux/usb/otg.h>

	static inline unsigned int get_irq_flags(struct resource *res)
	{
	unsigned int flags = IRQF_SAMPLE_RANDOM \| IRQF_SHARED;

	flags \|= res->flags & IRQF_TRIGGER_MASK;

	return flags;
	}

	static struct device *dev;
	static struct pda_power_pdata *pdata;
	static struct resource ac_irq, usb_irq;
	static struct timer_list charger_timer;
	static struct timer_list supply_timer;
	static struct timer_list polling_timer;
	static int polling;

	#ifdef CONFIG_USB_OTG_UTILS
	static struct usb_phy *transceiver;
	static struct notifier_block otg_nb;
	#endif

	static struct regulator *ac_draw;

	enum {
	PDA_PSY_OFFLINE = 0,
	PDA_PSY_ONLINE = 1,
	PDA_PSY_TO_CHANGE,
	};
	static int new_ac_status = -1;
	static int new_usb_status = -1;
	static int ac_status = -1;
	static int usb_status = -1;

	static int pda_power_get_property(struct power_supply *psy,
	enum power_supply_property psp,
	union power_supply_propval *val)
	{
	switch (psp) {
	case POWER_SUPPLY_PROP_ONLINE:
	if (psy->type == POWER_SUPPLY_TYPE_MAINS)
	val->intval = pdata->is_ac_online ?
	pdata->is_ac_online() : 0;
	else
	val->intval = pdata->is_usb_online ?
	pdata->is_usb_online() : 0;
	break;
	default:
	return -EINVAL;
	}
	return 0;
	}

	static enum power_supply_property pda_power_props[] = {
	POWER_SUPPLY_PROP_ONLINE,
	};

	static char *pda_power_supplied_to[] = {
	"main-battery",
	"backup-battery",
	};

	static struct power_supply pda_psy_ac = {
	.name = "ac",
	.type = POWER_SUPPLY_TYPE_MAINS,
	.supplied_to = pda_power_supplied_to,
	.num_supplicants = ARRAY_SIZE(pda_power_supplied_to),
	.properties = pda_power_props,
	.num_properties = ARRAY_SIZE(pda_power_props),
	.get_property = pda_power_get_property,
	};

	static struct power_supply pda_psy_usb = {
	.name = "usb",
	.type = POWER_SUPPLY_TYPE_USB,
	.supplied_to = pda_power_supplied_to,
	.num_supplicants = ARRAY_SIZE(pda_power_supplied_to),
	.properties = pda_power_props,
	.num_properties = ARRAY_SIZE(pda_power_props),
	.get_property = pda_power_get_property,
	};

	static void update_status(void)
	{
	if (pdata->is_ac_online)
	new_ac_status = !!pdata->is_ac_online();

	if (pdata->is_usb_online)
	new_usb_status = !!pdata->is_usb_online();
	}

	static void update_charger(void)
	{
	static int regulator_enabled;
	int max_uA = pdata->ac_max_uA;

	if (pdata->set_charge) {
	if (new_ac_status > 0) {
	dev_dbg(dev, "charger on (AC)\n");
	pdata->set_charge(PDA_POWER_CHARGE_AC);
	} else if (new_usb_status > 0) {
	dev_dbg(dev, "charger on (USB)\n");
	pdata->set_charge(PDA_POWER_CHARGE_USB);
	} else {
	dev_dbg(dev, "charger off\n");
	pdata->set_charge(0);
	}
	} else if (ac_draw) {
	if (new_ac_status > 0) {
	regulator_set_current_limit(ac_draw, max_uA, max_uA);
	if (!regulator_enabled) {
	dev_dbg(dev, "charger on (AC)\n");
	regulator_enable(ac_draw);
	regulator_enabled = 1;
	}
	} else {
	if (regulator_enabled) {
	dev_dbg(dev, "charger off\n");
	regulator_disable(ac_draw);
	regulator_enabled = 0;
	}
	}
	}
	}

	static void supply_timer_func(unsigned long unused)
	{
	if (ac_status == PDA_PSY_TO_CHANGE) {
	ac_status = new_ac_status;
	power_supply_changed(&pda_psy_ac);
	}

	if (usb_status == PDA_PSY_TO_CHANGE) {
	usb_status = new_usb_status;
	power_supply_changed(&pda_psy_usb);
	}
	}

	static void psy_changed(void)
	{
	update_charger();

	/*
	* Okay, charger set. Now wait a bit before notifying supplicants,
	* charge power should stabilize.
	*/
	mod_timer(&supply_timer,
	jiffies + msecs_to_jiffies(pdata->wait_for_charger));
	}

	static void charger_timer_func(unsigned long unused)
	{
	update_status();
	psy_changed();
	}

	static irqreturn_t power_changed_isr(int irq, void *power_supply)
	{
	if (power_supply == &pda_psy_ac)
	ac_status = PDA_PSY_TO_CHANGE;
	else if (power_supply == &pda_psy_usb)
	usb_status = PDA_PSY_TO_CHANGE;
	else
	return IRQ_NONE;

	/*
	* Wait a bit before reading ac/usb line status and setting charger,
	* because ac/usb status readings may lag from irq.
	*/
	mod_timer(&charger_timer,
	jiffies + msecs_to_jiffies(pdata->wait_for_status));

	return IRQ_HANDLED;
	}

	static void polling_timer_func(unsigned long unused)
	{
	int changed = 0;

	dev_dbg(dev, "polling...\n");

	update_status();

	if (!ac_irq && new_ac_status != ac_status) {
	ac_status = PDA_PSY_TO_CHANGE;
	changed = 1;
	}

	if (!usb_irq && new_usb_status != usb_status) {
	usb_status = PDA_PSY_TO_CHANGE;
	changed = 1;
	}

	if (changed)
	psy_changed();

	mod_timer(&polling_timer,
	jiffies + msecs_to_jiffies(pdata->polling_interval));
	}

	#ifdef CONFIG_USB_OTG_UTILS
	static int otg_is_usb_online(void)
	{
	return (transceiver->last_event == USB_EVENT_VBUS \|\|
	transceiver->last_event == USB_EVENT_ENUMERATED);
	}

	static int otg_is_ac_online(void)
	{
	return (transceiver->last_event == USB_EVENT_CHARGER);
	}

	static int otg_handle_notification(struct notifier_block *nb,
	unsigned long event, void *unused)
	{
	switch (event) {
	case USB_EVENT_CHARGER:
	ac_status = PDA_PSY_TO_CHANGE;
	break;
	case USB_EVENT_VBUS:
	case USB_EVENT_ENUMERATED:
	usb_status = PDA_PSY_TO_CHANGE;
	break;
	case USB_EVENT_NONE:
	ac_status = PDA_PSY_TO_CHANGE;
	usb_status = PDA_PSY_TO_CHANGE;
	break;
	default:
	return NOTIFY_OK;
	}

	/*
	* Wait a bit before reading ac/usb line status and setting charger,
	* because ac/usb status readings may lag from irq.
	*/
	mod_timer(&charger_timer,
	jiffies + msecs_to_jiffies(pdata->wait_for_status));

	return NOTIFY_OK;
	}
	#endif

	static int pda_power_probe(struct platform_device *pdev)
	{
	int ret = 0;

	dev = &pdev->dev;

	if (pdev->id != -1) {
	dev_err(dev, "it's meaningless to register several "
	"pda_powers; use id = -1\n");
	ret = -EINVAL;
	goto wrongid;
	}

	pdata = pdev->dev.platform_data;

	if (pdata->init) {
	ret = pdata->init(dev);
	if (ret < 0)
	goto init_failed;
	}

	update_status();
	update_charger();

	if (!pdata->wait_for_status)
	pdata->wait_for_status = 500;

	if (!pdata->wait_for_charger)
	pdata->wait_for_charger = 500;

	if (!pdata->polling_interval)
	pdata->polling_interval = 2000;

	if (!pdata->ac_max_uA)
	pdata->ac_max_uA = 500000;

	setup_timer(&charger_timer, charger_timer_func, 0);
	setup_timer(&supply_timer, supply_timer_func, 0);

	ac_irq = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "ac");
	usb_irq = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "usb");

	if (pdata->supplied_to) {
	pda_psy_ac.supplied_to = pdata->supplied_to;
	pda_psy_ac.num_supplicants = pdata->num_supplicants;
	pda_psy_usb.supplied_to = pdata->supplied_to;
	pda_psy_usb.num_supplicants = pdata->num_supplicants;
	}

	ac_draw = regulator_get(dev, "ac_draw");
	if (IS_ERR(ac_draw)) {
	dev_dbg(dev, "couldn't get ac_draw regulator\n");
	ac_draw = NULL;
	ret = PTR_ERR(ac_draw);
	}

	#ifdef CONFIG_USB_OTG_UTILS
	transceiver = usb_get_phy(USB_PHY_TYPE_USB2);
	if (!IS_ERR_OR_NULL(transceiver)) {
	if (!pdata->is_usb_online)
	pdata->is_usb_online = otg_is_usb_online;
	if (!pdata->is_ac_online)
	pdata->is_ac_online = otg_is_ac_online;
	}
	#endif

	if (pdata->is_ac_online) {
	ret = power_supply_register(&pdev->dev, &pda_psy_ac);
	if (ret) {
	dev_err(dev, "failed to register %s power supply\n",
	pda_psy_ac.name);
	goto ac_supply_failed;
	}

	if (ac_irq) {
	ret = request_irq(ac_irq->start, power_changed_isr,
	get_irq_flags(ac_irq), ac_irq->name,
	&pda_psy_ac);
	if (ret) {
	dev_err(dev, "request ac irq failed\n");
	goto ac_irq_failed;
	}
	} else {
	polling = 1;
	}
	}

	if (pdata->is_usb_online) {
	ret = power_supply_register(&pdev->dev, &pda_psy_usb);
	if (ret) {
	dev_err(dev, "failed to register %s power supply\n",
	pda_psy_usb.name);
	goto usb_supply_failed;
	}

	if (usb_irq) {
	ret = request_irq(usb_irq->start, power_changed_isr,
	get_irq_flags(usb_irq),
	usb_irq->name, &pda_psy_usb);
	if (ret) {
	dev_err(dev, "request usb irq failed\n");
	goto usb_irq_failed;
	}
	} else {
	polling = 1;
	}
	}

	#ifdef CONFIG_USB_OTG_UTILS
	if (!IS_ERR_OR_NULL(transceiver) && pdata->use_otg_notifier) {
	otg_nb.notifier_call = otg_handle_notification;
	ret = usb_register_notifier(transceiver, &otg_nb);
	if (ret) {
	dev_err(dev, "failure to register otg notifier\n");
	goto otg_reg_notifier_failed;
	}
	polling = 0;
	}
	#endif

	if (polling) {
	dev_dbg(dev, "will poll for status\n");
	setup_timer(&polling_timer, polling_timer_func, 0);
	mod_timer(&polling_timer,
	jiffies + msecs_to_jiffies(pdata->polling_interval));
	}

	if (ac_irq \|\| usb_irq)
	device_init_wakeup(&pdev->dev, 1);

	return 0;

	#ifdef CONFIG_USB_OTG_UTILS
	otg_reg_notifier_failed:
	if (pdata->is_usb_online && usb_irq)
	free_irq(usb_irq->start, &pda_psy_usb);
	#endif
	usb_irq_failed:
	if (pdata->is_usb_online)
	power_supply_unregister(&pda_psy_usb);
	usb_supply_failed:
	if (pdata->is_ac_online && ac_irq)
	free_irq(ac_irq->start, &pda_psy_ac);
	#ifdef CONFIG_USB_OTG_UTILS
	if (!IS_ERR_OR_NULL(transceiver))
	usb_put_phy(transceiver);
	#endif
	ac_irq_failed:
	if (pdata->is_ac_online)
	power_supply_unregister(&pda_psy_ac);
	ac_supply_failed:
	if (ac_draw) {
	regulator_put(ac_draw);
	ac_draw = NULL;
	}
	if (pdata->exit)
	pdata->exit(dev);
	init_failed:
	wrongid:
	return ret;
	}

	static int pda_power_remove(struct platform_device *pdev)
	{
	if (pdata->is_usb_online && usb_irq)
	free_irq(usb_irq->start, &pda_psy_usb);
	if (pdata->is_ac_online && ac_irq)
	free_irq(ac_irq->start, &pda_psy_ac);

	if (polling)
	del_timer_sync(&polling_timer);
	del_timer_sync(&charger_timer);
	del_timer_sync(&supply_timer);

	if (pdata->is_usb_online)
	power_supply_unregister(&pda_psy_usb);
	if (pdata->is_ac_online)
	power_supply_unregister(&pda_psy_ac);
	#ifdef CONFIG_USB_OTG_UTILS
	if (!IS_ERR_OR_NULL(transceiver))
	usb_put_phy(transceiver);
	#endif
	if (ac_draw) {
	regulator_put(ac_draw);
	ac_draw = NULL;
	}
	if (pdata->exit)
	pdata->exit(dev);

	return 0;
	}

	#ifdef CONFIG_PM
	static int ac_wakeup_enabled;
	static int usb_wakeup_enabled;

	static int pda_power_suspend(struct platform_device *pdev, pm_message_t state)
	{
	if (pdata->suspend) {
	int ret = pdata->suspend(state);

	if (ret)
	return ret;
	}

	if (device_may_wakeup(&pdev->dev)) {
	if (ac_irq)
	ac_wakeup_enabled = !enable_irq_wake(ac_irq->start);
	if (usb_irq)
	usb_wakeup_enabled = !enable_irq_wake(usb_irq->start);
	}

	return 0;
	}

	static int pda_power_resume(struct platform_device *pdev)
	{
	if (device_may_wakeup(&pdev->dev)) {
	if (usb_irq && usb_wakeup_enabled)
	disable_irq_wake(usb_irq->start);
	if (ac_irq && ac_wakeup_enabled)
	disable_irq_wake(ac_irq->start);
	}

	if (pdata->resume)
	return pdata->resume();

	return 0;
	}
	#else
	#define pda_power_suspend NULL
	#define pda_power_resume NULL
	#endif /* CONFIG_PM */

	static struct platform_driver pda_power_pdrv = {
	.driver = {
	.name = "pda-power",
	},
	.probe = pda_power_probe,
	.remove = pda_power_remove,
	.suspend = pda_power_suspend,
	.resume = pda_power_resume,
	};

	module_platform_driver(pda_power_pdrv);

	MODULE_LICENSE("GPL");
	MODULE_AUTHOR("Anton Vorontsov <cbou@mail.ru>");
	MODULE_ALIAS("platform:pda-power");