[deliverable/linux.git] / drivers / power / power_supply_core.c

/*
 *  Universal power supply monitor class
 *
 *  Copyright © 2007  Anton Vorontsov <cbou@mail.ru>
 *  Copyright © 2004  Szabolcs Gyurko
 *  Copyright © 2003  Ian Molton <spyro@f2s.com>
 *
 *  Modified: 2004, Oct     Szabolcs Gyurko
 *
 *  You may use this code as per GPL version 2
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/device.h>
#include <linux/notifier.h>
#include <linux/err.h>
#include <linux/power_supply.h>
#include <linux/thermal.h>
#include "power_supply.h"

/* exported for the APM Power driver, APM emulation */
struct class *power_supply_class;
EXPORT_SYMBOL_GPL(power_supply_class);

ATOMIC_NOTIFIER_HEAD(power_supply_notifier);
EXPORT_SYMBOL_GPL(power_supply_notifier);

static struct device_type power_supply_dev_type;

static bool __power_supply_is_supplied_by(struct power_supply *supplier,
					 struct power_supply *supply)
{
	int i;

	if (!supply->supplied_from && !supplier->supplied_to)
		return false;

	/* Support both supplied_to and supplied_from modes */
	if (supply->supplied_from) {
		if (!supplier->name)
			return false;
		for (i = 0; i < supply->num_supplies; i++)
			if (!strcmp(supplier->name, supply->supplied_from[i]))
				return true;
	} else {
		if (!supply->name)
			return false;
		for (i = 0; i < supplier->num_supplicants; i++)
			if (!strcmp(supplier->supplied_to[i], supply->name))
				return true;
	}

	return false;
}

static int __power_supply_changed_work(struct device *dev, void *data)
{
	struct power_supply *psy = (struct power_supply *)data;
	struct power_supply *pst = dev_get_drvdata(dev);

	if (__power_supply_is_supplied_by(psy, pst)) {
		if (pst->external_power_changed)
			pst->external_power_changed(pst);
	}

	return 0;
}

static void power_supply_changed_work(struct work_struct *work)
{
	unsigned long flags;
	struct power_supply *psy = container_of(work, struct power_supply,
						changed_work);

	dev_dbg(psy->dev, "%s\n", __func__);

	spin_lock_irqsave(&psy->changed_lock, flags);
	if (psy->changed) {
		psy->changed = false;
		spin_unlock_irqrestore(&psy->changed_lock, flags);
		class_for_each_device(power_supply_class, NULL, psy,
				      __power_supply_changed_work);
		power_supply_update_leds(psy);
		atomic_notifier_call_chain(&power_supply_notifier,
				PSY_EVENT_PROP_CHANGED, psy);
		kobject_uevent(&psy->dev->kobj, KOBJ_CHANGE);
		spin_lock_irqsave(&psy->changed_lock, flags);
	}
	/*
	 * Dependent power supplies (e.g. battery) may have changed state
	 * as a result of this event, so poll again and hold the
	 * wakeup_source until all events are processed.
	 */
	if (!psy->changed)
		pm_relax(psy->dev);
	spin_unlock_irqrestore(&psy->changed_lock, flags);
}

void power_supply_changed(struct power_supply *psy)
{
	unsigned long flags;

	dev_dbg(psy->dev, "%s\n", __func__);

	spin_lock_irqsave(&psy->changed_lock, flags);
	psy->changed = true;
	pm_stay_awake(psy->dev);
	spin_unlock_irqrestore(&psy->changed_lock, flags);
	schedule_work(&psy->changed_work);
}
EXPORT_SYMBOL_GPL(power_supply_changed);

#ifdef CONFIG_OF
#include <linux/of.h>

static int __power_supply_populate_supplied_from(struct device *dev,
						 void *data)
{
	struct power_supply *psy = (struct power_supply *)data;
	struct power_supply *epsy = dev_get_drvdata(dev);
	struct device_node *np;
	int i = 0;

	do {
		np = of_parse_phandle(psy->of_node, "power-supplies", i++);
		if (!np)
			continue;

		if (np == epsy->of_node) {
			dev_info(psy->dev, "%s: Found supply : %s\n",
				psy->name, epsy->name);
			psy->supplied_from[i-1] = (char *)epsy->name;
			psy->num_supplies++;
			of_node_put(np);
			break;
		}
		of_node_put(np);
	} while (np);

	return 0;
}

static int power_supply_populate_supplied_from(struct power_supply *psy)
{
	int error;

	error = class_for_each_device(power_supply_class, NULL, psy,
				      __power_supply_populate_supplied_from);

	dev_dbg(psy->dev, "%s %d\n", __func__, error);

	return error;
}

static int  __power_supply_find_supply_from_node(struct device *dev,
						 void *data)
{
	struct device_node *np = (struct device_node *)data;
	struct power_supply *epsy = dev_get_drvdata(dev);

	/* return error breaks out of class_for_each_device loop */
	if (epsy->of_node == np)
		return -EINVAL;

	return 0;
}

static int power_supply_find_supply_from_node(struct device_node *supply_node)
{
	int error;
	struct device *dev;
	struct class_dev_iter iter;

	/*
	 * Use iterator to see if any other device is registered.
	 * This is required since class_for_each_device returns 0
	 * if there are no devices registered.
	 */
	class_dev_iter_init(&iter, power_supply_class, NULL, NULL);
	dev = class_dev_iter_next(&iter);

	if (!dev)
		return -EPROBE_DEFER;

	/*
	 * We have to treat the return value as inverted, because if
	 * we return error on not found, then it won't continue looking.
	 * So we trick it by returning error on success to stop looking
	 * once the matching device is found.
	 */
	error = class_for_each_device(power_supply_class, NULL, supply_node,
				       __power_supply_find_supply_from_node);

	return error ? 0 : -EPROBE_DEFER;
}

static int power_supply_check_supplies(struct power_supply *psy)
{
	struct device_node *np;
	int cnt = 0;

	/* If there is already a list honor it */
	if (psy->supplied_from && psy->num_supplies > 0)
		return 0;

	/* No device node found, nothing to do */
	if (!psy->of_node)
		return 0;

	do {
		int ret;

		np = of_parse_phandle(psy->of_node, "power-supplies", cnt++);
		if (!np)
			continue;

		ret = power_supply_find_supply_from_node(np);
		if (ret) {
			dev_dbg(psy->dev, "Failed to find supply, defer!\n");
			of_node_put(np);
			return -EPROBE_DEFER;
		}
		of_node_put(np);
	} while (np);

	/* All supplies found, allocate char ** array for filling */
	psy->supplied_from = devm_kzalloc(psy->dev, sizeof(psy->supplied_from),
					  GFP_KERNEL);
	if (!psy->supplied_from) {
		dev_err(psy->dev, "Couldn't allocate memory for supply list\n");
		return -ENOMEM;
	}

	*psy->supplied_from = devm_kzalloc(psy->dev, sizeof(char *) * cnt,
					   GFP_KERNEL);
	if (!*psy->supplied_from) {
		dev_err(psy->dev, "Couldn't allocate memory for supply list\n");
		return -ENOMEM;
	}

	return power_supply_populate_supplied_from(psy);
}
#else
static inline int power_supply_check_supplies(struct power_supply *psy)
{
	return 0;
}
#endif

static int __power_supply_am_i_supplied(struct device *dev, void *data)
{
	union power_supply_propval ret = {0,};
	struct power_supply *psy = (struct power_supply *)data;
	struct power_supply *epsy = dev_get_drvdata(dev);

	if (__power_supply_is_supplied_by(epsy, psy))
		if (!epsy->get_property(epsy, POWER_SUPPLY_PROP_ONLINE, &ret)) {
			if (ret.intval)
				return ret.intval;
		}

	return 0;
}

int power_supply_am_i_supplied(struct power_supply *psy)
{
	int error;

	error = class_for_each_device(power_supply_class, NULL, psy,
				      __power_supply_am_i_supplied);

	dev_dbg(psy->dev, "%s %d\n", __func__, error);

	return error;
}
EXPORT_SYMBOL_GPL(power_supply_am_i_supplied);

static int __power_supply_is_system_supplied(struct device *dev, void *data)
{
	union power_supply_propval ret = {0,};
	struct power_supply *psy = dev_get_drvdata(dev);
	unsigned int *count = data;

	(*count)++;
	if (psy->type != POWER_SUPPLY_TYPE_BATTERY) {
		if (psy->get_property(psy, POWER_SUPPLY_PROP_ONLINE, &ret))
			return 0;
		if (ret.intval)
			return ret.intval;
	}
	return 0;
}

int power_supply_is_system_supplied(void)
{
	int error;
	unsigned int count = 0;

	error = class_for_each_device(power_supply_class, NULL, &count,
				      __power_supply_is_system_supplied);

	/*
	 * If no power class device was found at all, most probably we are
	 * running on a desktop system, so assume we are on mains power.
	 */
	if (count == 0)
		return 1;

	return error;
}
EXPORT_SYMBOL_GPL(power_supply_is_system_supplied);

int power_supply_set_battery_charged(struct power_supply *psy)
{
	if (psy->type == POWER_SUPPLY_TYPE_BATTERY && psy->set_charged) {
		psy->set_charged(psy);
		return 0;
	}

	return -EINVAL;
}
EXPORT_SYMBOL_GPL(power_supply_set_battery_charged);

static int power_supply_match_device_by_name(struct device *dev, const void *data)
{
	const char *name = data;
	struct power_supply *psy = dev_get_drvdata(dev);

	return strcmp(psy->name, name) == 0;
}

struct power_supply *power_supply_get_by_name(const char *name)
{
	struct device *dev = class_find_device(power_supply_class, NULL, name,
					power_supply_match_device_by_name);

	return dev ? dev_get_drvdata(dev) : NULL;
}
EXPORT_SYMBOL_GPL(power_supply_get_by_name);

#ifdef CONFIG_OF
static int power_supply_match_device_node(struct device *dev, const void *data)
{
	return dev->parent && dev->parent->of_node == data;
}

struct power_supply *power_supply_get_by_phandle(struct device_node *np,
							const char *property)
{
	struct device_node *power_supply_np;
	struct device *dev;

	power_supply_np = of_parse_phandle(np, property, 0);
	if (!power_supply_np)
		return ERR_PTR(-ENODEV);

	dev = class_find_device(power_supply_class, NULL, power_supply_np,
						power_supply_match_device_node);

	of_node_put(power_supply_np);

	return dev ? dev_get_drvdata(dev) : NULL;
}
EXPORT_SYMBOL_GPL(power_supply_get_by_phandle);
#endif /* CONFIG_OF */

int power_supply_powers(struct power_supply *psy, struct device *dev)
{
	return sysfs_create_link(&psy->dev->kobj, &dev->kobj, "powers");
}
EXPORT_SYMBOL_GPL(power_supply_powers);

static void power_supply_dev_release(struct device *dev)
{
	pr_debug("device: '%s': %s\n", dev_name(dev), __func__);
	kfree(dev);
}

int power_supply_reg_notifier(struct notifier_block *nb)
{
	return atomic_notifier_chain_register(&power_supply_notifier, nb);
}
EXPORT_SYMBOL_GPL(power_supply_reg_notifier);

void power_supply_unreg_notifier(struct notifier_block *nb)
{
	atomic_notifier_chain_unregister(&power_supply_notifier, nb);
}
EXPORT_SYMBOL_GPL(power_supply_unreg_notifier);

#ifdef CONFIG_THERMAL
static int power_supply_read_temp(struct thermal_zone_device *tzd,
		unsigned long *temp)
{
	struct power_supply *psy;
	union power_supply_propval val;
	int ret;

	WARN_ON(tzd == NULL);
	psy = tzd->devdata;
	ret = psy->get_property(psy, POWER_SUPPLY_PROP_TEMP, &val);

	/* Convert tenths of degree Celsius to milli degree Celsius. */
	if (!ret)
		*temp = val.intval * 100;

	return ret;
}

static struct thermal_zone_device_ops psy_tzd_ops = {
	.get_temp = power_supply_read_temp,
};

static int psy_register_thermal(struct power_supply *psy)
{
	int i;

	/* Register battery zone device psy reports temperature */
	for (i = 0; i < psy->num_properties; i++) {
		if (psy->properties[i] == POWER_SUPPLY_PROP_TEMP) {
			psy->tzd = thermal_zone_device_register(psy->name, 0, 0,
					psy, &psy_tzd_ops, NULL, 0, 0);
			if (IS_ERR(psy->tzd))
				return PTR_ERR(psy->tzd);
			break;
		}
	}
	return 0;
}

static void psy_unregister_thermal(struct power_supply *psy)
{
	if (IS_ERR_OR_NULL(psy->tzd))
		return;
	thermal_zone_device_unregister(psy->tzd);
}

/* thermal cooling device callbacks */
static int ps_get_max_charge_cntl_limit(struct thermal_cooling_device *tcd,
					unsigned long *state)
{
	struct power_supply *psy;
	union power_supply_propval val;
	int ret;

	psy = tcd->devdata;
	ret = psy->get_property(psy,
		POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT_MAX, &val);
	if (!ret)
		*state = val.intval;

	return ret;
}

static int ps_get_cur_chrage_cntl_limit(struct thermal_cooling_device *tcd,
					unsigned long *state)
{
	struct power_supply *psy;
	union power_supply_propval val;
	int ret;

	psy = tcd->devdata;
	ret = psy->get_property(psy,
		POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT, &val);
	if (!ret)
		*state = val.intval;

	return ret;
}

static int ps_set_cur_charge_cntl_limit(struct thermal_cooling_device *tcd,
					unsigned long state)
{
	struct power_supply *psy;
	union power_supply_propval val;
	int ret;

	psy = tcd->devdata;
	val.intval = state;
	ret = psy->set_property(psy,
		POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT, &val);

	return ret;
}

static struct thermal_cooling_device_ops psy_tcd_ops = {
	.get_max_state = ps_get_max_charge_cntl_limit,
	.get_cur_state = ps_get_cur_chrage_cntl_limit,
	.set_cur_state = ps_set_cur_charge_cntl_limit,
};

static int psy_register_cooler(struct power_supply *psy)
{
	int i;

	/* Register for cooling device if psy can control charging */
	for (i = 0; i < psy->num_properties; i++) {
		if (psy->properties[i] ==
				POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT) {
			psy->tcd = thermal_cooling_device_register(
							(char *)psy->name,
							psy, &psy_tcd_ops);
			if (IS_ERR(psy->tcd))
				return PTR_ERR(psy->tcd);
			break;
		}
	}
	return 0;
}

static void psy_unregister_cooler(struct power_supply *psy)
{
	if (IS_ERR_OR_NULL(psy->tcd))
		return;
	thermal_cooling_device_unregister(psy->tcd);
}
#else
static int psy_register_thermal(struct power_supply *psy)
{
	return 0;
}

static void psy_unregister_thermal(struct power_supply *psy)
{
}

static int psy_register_cooler(struct power_supply *psy)
{
	return 0;
}

static void psy_unregister_cooler(struct power_supply *psy)
{
}
#endif

int power_supply_register(struct device *parent, struct power_supply *psy)
{
	struct device *dev;
	int rc;

	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
	if (!dev)
		return -ENOMEM;

	device_initialize(dev);

	dev->class = power_supply_class;
	dev->type = &power_supply_dev_type;
	dev->parent = parent;
	dev->release = power_supply_dev_release;
	dev_set_drvdata(dev, psy);
	psy->dev = dev;

	rc = dev_set_name(dev, "%s", psy->name);
	if (rc)
		goto dev_set_name_failed;

	INIT_WORK(&psy->changed_work, power_supply_changed_work);

	rc = power_supply_check_supplies(psy);
	if (rc) {
		dev_info(dev, "Not all required supplies found, defer probe\n");
		goto check_supplies_failed;
	}

	spin_lock_init(&psy->changed_lock);
	rc = device_init_wakeup(dev, true);
	if (rc)
		goto wakeup_init_failed;

	rc = device_add(dev);
	if (rc)
		goto device_add_failed;

	rc = psy_register_thermal(psy);
	if (rc)
		goto register_thermal_failed;

	rc = psy_register_cooler(psy);
	if (rc)
		goto register_cooler_failed;

	rc = power_supply_create_triggers(psy);
	if (rc)
		goto create_triggers_failed;

	power_supply_changed(psy);

	goto success;

create_triggers_failed:
	psy_unregister_cooler(psy);
register_cooler_failed:
	psy_unregister_thermal(psy);
register_thermal_failed:
	device_del(dev);
device_add_failed:
wakeup_init_failed:
check_supplies_failed:
dev_set_name_failed:
	put_device(dev);
success:
	return rc;
}
EXPORT_SYMBOL_GPL(power_supply_register);

void power_supply_unregister(struct power_supply *psy)
{
	cancel_work_sync(&psy->changed_work);
	sysfs_remove_link(&psy->dev->kobj, "powers");
	power_supply_remove_triggers(psy);
	psy_unregister_cooler(psy);
	psy_unregister_thermal(psy);
	device_init_wakeup(psy->dev, false);
	device_unregister(psy->dev);
}
EXPORT_SYMBOL_GPL(power_supply_unregister);

static int __init power_supply_class_init(void)
{
	power_supply_class = class_create(THIS_MODULE, "power_supply");

	if (IS_ERR(power_supply_class))
		return PTR_ERR(power_supply_class);

	power_supply_class->dev_uevent = power_supply_uevent;
	power_supply_init_attrs(&power_supply_dev_type);

	return 0;
}

static void __exit power_supply_class_exit(void)
{
	class_destroy(power_supply_class);
}

subsys_initcall(power_supply_class_init);
module_exit(power_supply_class_exit);

MODULE_DESCRIPTION("Universal power supply monitor class");
MODULE_AUTHOR("Ian Molton <spyro@f2s.com>, "
	      "Szabolcs Gyurko, "
	      "Anton Vorontsov <cbou@mail.ru>");
MODULE_LICENSE("GPL");
Commit	Line	Data
4a11b59d AV	1	/*
	2	* Universal power supply monitor class
	3	*
	4	* Copyright © 2007 Anton Vorontsov <cbou@mail.ru>
	5	* Copyright © 2004 Szabolcs Gyurko
	6	* Copyright © 2003 Ian Molton <spyro@f2s.com>
	7	*
	8	* Modified: 2004, Oct Szabolcs Gyurko
	9	*
	10	* You may use this code as per GPL version 2
	11	*/
	12
	13	#include <linux/module.h>
	14	#include <linux/types.h>
	15	#include <linux/init.h>
5f487cd3	16	#include <linux/slab.h>
4a11b59d	17	#include <linux/device.h>
d36240d2	18	#include <linux/notifier.h>
4a11b59d AV	19	#include <linux/err.h>
4a11b59d AV	20	#include <linux/power_supply.h>
3be330bf	21	#include <linux/thermal.h>
4a11b59d AV	22	#include "power_supply.h"
4a11b59d AV	23
ff3417e7	24	/* exported for the APM Power driver, APM emulation */
4a11b59d	25	struct class *power_supply_class;
ff3417e7	26	EXPORT_SYMBOL_GPL(power_supply_class);
4a11b59d	27
d36240d2 PR	28	ATOMIC_NOTIFIER_HEAD(power_supply_notifier);
	29	EXPORT_SYMBOL_GPL(power_supply_notifier);
	30
5f487cd3 AV	31	static struct device_type power_supply_dev_type;
5f487cd3 AV	32
5e0848c6 RK	33	static bool __power_supply_is_supplied_by(struct power_supply *supplier,
	34	struct power_supply *supply)
	35	{
	36	int i;
	37
	38	if (!supply->supplied_from && !supplier->supplied_to)
	39	return false;
	40
	41	/* Support both supplied_to and supplied_from modes */
	42	if (supply->supplied_from) {
	43	if (!supplier->name)
	44	return false;
	45	for (i = 0; i < supply->num_supplies; i++)
	46	if (!strcmp(supplier->name, supply->supplied_from[i]))
	47	return true;
	48	} else {
	49	if (!supply->name)
	50	return false;
	51	for (i = 0; i < supplier->num_supplicants; i++)
	52	if (!strcmp(supplier->supplied_to[i], supply->name))
	53	return true;
	54	}
	55
	56	return false;
	57	}
	58
443cad92 DY	59	static int __power_supply_changed_work(struct device dev, void data)
	60	{
	61	struct power_supply psy = (struct power_supply )data;
	62	struct power_supply *pst = dev_get_drvdata(dev);
443cad92	63
5e0848c6 RK	64	if (__power_supply_is_supplied_by(psy, pst)) {
	65	if (pst->external_power_changed)
	66	pst->external_power_changed(pst);
	67	}
	68
443cad92 DY	69	return 0;
	70	}
	71
4a11b59d AV	72	static void power_supply_changed_work(struct work_struct *work)
4a11b59d AV	73	{
948dcf96	74	unsigned long flags;
4a11b59d AV	75	struct power_supply *psy = container_of(work, struct power_supply,
4a11b59d AV	76	changed_work);
4a11b59d	77
0cddc0a9	78	dev_dbg(psy->dev, "%s\n", __func__);
4a11b59d	79
948dcf96 ZM	80	spin_lock_irqsave(&psy->changed_lock, flags);
	81	if (psy->changed) {
	82	psy->changed = false;
	83	spin_unlock_irqrestore(&psy->changed_lock, flags);
	84	class_for_each_device(power_supply_class, NULL, psy,
	85	__power_supply_changed_work);
	86	power_supply_update_leds(psy);
d36240d2 PR	87	atomic_notifier_call_chain(&power_supply_notifier,
d36240d2 PR	88	PSY_EVENT_PROP_CHANGED, psy);
948dcf96 ZM	89	kobject_uevent(&psy->dev->kobj, KOBJ_CHANGE);
	90	spin_lock_irqsave(&psy->changed_lock, flags);
	91	}
	92	/*
	93	* Dependent power supplies (e.g. battery) may have changed state
	94	* as a result of this event, so poll again and hold the
	95	* wakeup_source until all events are processed.
	96	*/
	97	if (!psy->changed)
	98	pm_relax(psy->dev);
	99	spin_unlock_irqrestore(&psy->changed_lock, flags);
4a11b59d AV	100	}
	101
	102	void power_supply_changed(struct power_supply *psy)
	103	{
948dcf96 ZM	104	unsigned long flags;
948dcf96 ZM	105
0cddc0a9	106	dev_dbg(psy->dev, "%s\n", __func__);
4a11b59d	107
948dcf96 ZM	108	spin_lock_irqsave(&psy->changed_lock, flags);
	109	psy->changed = true;
	110	pm_stay_awake(psy->dev);
	111	spin_unlock_irqrestore(&psy->changed_lock, flags);
4a11b59d	112	schedule_work(&psy->changed_work);
4a11b59d	113	}
ff3417e7	114	EXPORT_SYMBOL_GPL(power_supply_changed);
4a11b59d	115
f6e0b081 RK	116	#ifdef CONFIG_OF
	117	#include <linux/of.h>
	118
	119	static int __power_supply_populate_supplied_from(struct device *dev,
	120	void *data)
	121	{
	122	struct power_supply psy = (struct power_supply )data;
	123	struct power_supply *epsy = dev_get_drvdata(dev);
	124	struct device_node *np;
	125	int i = 0;
	126
	127	do {
	128	np = of_parse_phandle(psy->of_node, "power-supplies", i++);
	129	if (!np)
	130	continue;
	131
	132	if (np == epsy->of_node) {
	133	dev_info(psy->dev, "%s: Found supply : %s\n",
	134	psy->name, epsy->name);
	135	psy->supplied_from[i-1] = (char *)epsy->name;
	136	psy->num_supplies++;
2054d6e9	137	of_node_put(np);
f6e0b081 RK	138	break;
f6e0b081 RK	139	}
2054d6e9	140	of_node_put(np);
f6e0b081 RK	141	} while (np);
	142
	143	return 0;
	144	}
	145
	146	static int power_supply_populate_supplied_from(struct power_supply *psy)
	147	{
	148	int error;
	149
	150	error = class_for_each_device(power_supply_class, NULL, psy,
	151	__power_supply_populate_supplied_from);
	152
	153	dev_dbg(psy->dev, "%s %d\n", __func__, error);
	154
	155	return error;
	156	}
	157
	158	static int __power_supply_find_supply_from_node(struct device *dev,
	159	void *data)
	160	{
	161	struct device_node np = (struct device_node )data;
	162	struct power_supply *epsy = dev_get_drvdata(dev);
	163
	164	/* return error breaks out of class_for_each_device loop */
	165	if (epsy->of_node == np)
	166	return -EINVAL;
	167
	168	return 0;
	169	}
	170
	171	static int power_supply_find_supply_from_node(struct device_node *supply_node)
	172	{
	173	int error;
	174	struct device *dev;
	175	struct class_dev_iter iter;
	176
	177	/*
	178	* Use iterator to see if any other device is registered.
	179	* This is required since class_for_each_device returns 0
	180	* if there are no devices registered.
	181	*/
	182	class_dev_iter_init(&iter, power_supply_class, NULL, NULL);
	183	dev = class_dev_iter_next(&iter);
	184
	185	if (!dev)
	186	return -EPROBE_DEFER;
	187
	188	/*
	189	* We have to treat the return value as inverted, because if
	190	* we return error on not found, then it won't continue looking.
	191	* So we trick it by returning error on success to stop looking
	192	* once the matching device is found.
	193	*/
	194	error = class_for_each_device(power_supply_class, NULL, supply_node,
	195	__power_supply_find_supply_from_node);
	196
	197	return error ? 0 : -EPROBE_DEFER;
	198	}
	199
	200	static int power_supply_check_supplies(struct power_supply *psy)
	201	{
	202	struct device_node *np;
	203	int cnt = 0;
	204
205	/* If there is already a list honor it */
206	if (psy->supplied_from && psy->num_supplies > 0)
207	return 0;
208
209	/* No device node found, nothing to do */
210	if (!psy->of_node)
211	return 0;
212
213	do {
214	int ret;
215
216	np = of_parse_phandle(psy->of_node, "power-supplies", cnt++);
217	if (!np)
218	continue;
219
220	ret = power_supply_find_supply_from_node(np);
221	if (ret) {
222	dev_dbg(psy->dev, "Failed to find supply, defer!\n");
2054d6e9	223	of_node_put(np);
f6e0b081 RK	224	return -EPROBE_DEFER;
f6e0b081 RK	225	}
2054d6e9	226	of_node_put(np);
f6e0b081 RK	227	} while (np);
	228
	229	/* All supplies found, allocate char ** array for filling */
	230	psy->supplied_from = devm_kzalloc(psy->dev, sizeof(psy->supplied_from),
	231	GFP_KERNEL);
	232	if (!psy->supplied_from) {
	233	dev_err(psy->dev, "Couldn't allocate memory for supply list\n");
	234	return -ENOMEM;
	235	}
	236
	237	psy->supplied_from = devm_kzalloc(psy->dev, sizeof(char ) * cnt,
	238	GFP_KERNEL);
	239	if (!*psy->supplied_from) {
	240	dev_err(psy->dev, "Couldn't allocate memory for supply list\n");
	241	return -ENOMEM;
	242	}
	243
	244	return power_supply_populate_supplied_from(psy);
	245	}
	246	#else
	247	static inline int power_supply_check_supplies(struct power_supply *psy)
	248	{
	249	return 0;
	250	}
	251	#endif
	252
443cad92	253	static int __power_supply_am_i_supplied(struct device dev, void data)
4a11b59d AV	254	{
4a11b59d AV	255	union power_supply_propval ret = {0,};
443cad92 DY	256	struct power_supply psy = (struct power_supply )data;
443cad92 DY	257	struct power_supply *epsy = dev_get_drvdata(dev);
443cad92	258
5e0848c6 RK	259	if (__power_supply_is_supplied_by(epsy, psy))
5e0848c6 RK	260	if (!epsy->get_property(epsy, POWER_SUPPLY_PROP_ONLINE, &ret)) {
443cad92 DY	261	if (ret.intval)
443cad92 DY	262	return ret.intval;
4a11b59d	263	}
5e0848c6	264
443cad92 DY	265	return 0;
	266	}
	267
	268	int power_supply_am_i_supplied(struct power_supply *psy)
	269	{
	270	int error;
	271
93562b53	272	error = class_for_each_device(power_supply_class, NULL, psy,
443cad92	273	__power_supply_am_i_supplied);
4a11b59d	274
0cddc0a9	275	dev_dbg(psy->dev, "%s %d\n", __func__, error);
4a11b59d	276
443cad92	277	return error;
4a11b59d	278	}
ff3417e7	279	EXPORT_SYMBOL_GPL(power_supply_am_i_supplied);
4a11b59d	280
942ed161 MG	281	static int __power_supply_is_system_supplied(struct device dev, void data)
	282	{
	283	union power_supply_propval ret = {0,};
	284	struct power_supply *psy = dev_get_drvdata(dev);
2530daa1	285	unsigned int *count = data;
942ed161	286
2530daa1	287	(*count)++;
942ed161 MG	288	if (psy->type != POWER_SUPPLY_TYPE_BATTERY) {
	289	if (psy->get_property(psy, POWER_SUPPLY_PROP_ONLINE, &ret))
	290	return 0;
	291	if (ret.intval)
	292	return ret.intval;
	293	}
	294	return 0;
	295	}
	296
	297	int power_supply_is_system_supplied(void)
	298	{
	299	int error;
2530daa1	300	unsigned int count = 0;
942ed161	301
2530daa1	302	error = class_for_each_device(power_supply_class, NULL, &count,
942ed161 MG	303	__power_supply_is_system_supplied);
942ed161 MG	304
2530daa1 JD	305	/*
	306	* If no power class device was found at all, most probably we are
	307	* running on a desktop system, so assume we are on mains power.
	308	*/
	309	if (count == 0)
	310	return 1;
	311
942ed161 MG	312	return error;
942ed161 MG	313	}
ff3417e7	314	EXPORT_SYMBOL_GPL(power_supply_is_system_supplied);
942ed161	315
e5f5ccb6 DM	316	int power_supply_set_battery_charged(struct power_supply *psy)
	317	{
	318	if (psy->type == POWER_SUPPLY_TYPE_BATTERY && psy->set_charged) {
	319	psy->set_charged(psy);
	320	return 0;
	321	}
	322
	323	return -EINVAL;
	324	}
	325	EXPORT_SYMBOL_GPL(power_supply_set_battery_charged);
	326
9f3b795a	327	static int power_supply_match_device_by_name(struct device dev, const void data)
e5f5ccb6 DM	328	{
	329	const char *name = data;
	330	struct power_supply *psy = dev_get_drvdata(dev);
	331
	332	return strcmp(psy->name, name) == 0;
	333	}
	334
9f3b795a	335	struct power_supply power_supply_get_by_name(const char name)
e5f5ccb6 DM	336	{
	337	struct device *dev = class_find_device(power_supply_class, NULL, name,
	338	power_supply_match_device_by_name);
	339
	340	return dev ? dev_get_drvdata(dev) : NULL;
	341	}
	342	EXPORT_SYMBOL_GPL(power_supply_get_by_name);
	343
abce9770 SR	344	#ifdef CONFIG_OF
	345	static int power_supply_match_device_node(struct device dev, const void data)
	346	{
	347	return dev->parent && dev->parent->of_node == data;
	348	}
	349
	350	struct power_supply power_supply_get_by_phandle(struct device_node np,
	351	const char *property)
	352	{
	353	struct device_node *power_supply_np;
	354	struct device *dev;
	355
	356	power_supply_np = of_parse_phandle(np, property, 0);
	357	if (!power_supply_np)
	358	return ERR_PTR(-ENODEV);
	359
	360	dev = class_find_device(power_supply_class, NULL, power_supply_np,
	361	power_supply_match_device_node);
	362
	363	of_node_put(power_supply_np);
	364
	365	return dev ? dev_get_drvdata(dev) : NULL;
	366	}
	367	EXPORT_SYMBOL_GPL(power_supply_get_by_phandle);
	368	#endif /* CONFIG_OF */
	369
83516651 JF	370	int power_supply_powers(struct power_supply psy, struct device dev)
83516651 JF	371	{
93278d15	372	return sysfs_create_link(&psy->dev->kobj, &dev->kobj, "powers");
83516651 JF	373	}
	374	EXPORT_SYMBOL_GPL(power_supply_powers);
	375
5f487cd3 AV	376	static void power_supply_dev_release(struct device *dev)
	377	{
	378	pr_debug("device: '%s': %s\n", dev_name(dev), __func__);
	379	kfree(dev);
	380	}
	381
d36240d2 PR	382	int power_supply_reg_notifier(struct notifier_block *nb)
	383	{
	384	return atomic_notifier_chain_register(&power_supply_notifier, nb);
	385	}
	386	EXPORT_SYMBOL_GPL(power_supply_reg_notifier);
	387
	388	void power_supply_unreg_notifier(struct notifier_block *nb)
	389	{
	390	atomic_notifier_chain_unregister(&power_supply_notifier, nb);
	391	}
	392	EXPORT_SYMBOL_GPL(power_supply_unreg_notifier);
	393
3be330bf JT	394	#ifdef CONFIG_THERMAL
	395	static int power_supply_read_temp(struct thermal_zone_device *tzd,
	396	unsigned long *temp)
	397	{
	398	struct power_supply *psy;
	399	union power_supply_propval val;
	400	int ret;
	401
	402	WARN_ON(tzd == NULL);
	403	psy = tzd->devdata;
	404	ret = psy->get_property(psy, POWER_SUPPLY_PROP_TEMP, &val);
	405
	406	/* Convert tenths of degree Celsius to milli degree Celsius. */
	407	if (!ret)
	408	temp = val.intval 100;
	409
	410	return ret;
	411	}
	412
	413	static struct thermal_zone_device_ops psy_tzd_ops = {
	414	.get_temp = power_supply_read_temp,
	415	};
	416
	417	static int psy_register_thermal(struct power_supply *psy)
	418	{
	419	int i;
	420
	421	/* Register battery zone device psy reports temperature */
	422	for (i = 0; i < psy->num_properties; i++) {
	423	if (psy->properties[i] == POWER_SUPPLY_PROP_TEMP) {
e6db06a5	424	psy->tzd = thermal_zone_device_register(psy->name, 0, 0,
50125a9b	425	psy, &psy_tzd_ops, NULL, 0, 0);
3be330bf JT	426	if (IS_ERR(psy->tzd))
	427	return PTR_ERR(psy->tzd);
	428	break;
	429	}
	430	}
	431	return 0;
	432	}
	433
	434	static void psy_unregister_thermal(struct power_supply *psy)
	435	{
	436	if (IS_ERR_OR_NULL(psy->tzd))
	437	return;
	438	thermal_zone_device_unregister(psy->tzd);
	439	}
952aeeb3 RP	440
	441	/* thermal cooling device callbacks */
	442	static int ps_get_max_charge_cntl_limit(struct thermal_cooling_device *tcd,
	443	unsigned long *state)
	444	{
	445	struct power_supply *psy;
	446	union power_supply_propval val;
	447	int ret;
	448
	449	psy = tcd->devdata;
	450	ret = psy->get_property(psy,
	451	POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT_MAX, &val);
	452	if (!ret)
	453	*state = val.intval;
	454
	455	return ret;
	456	}
	457
	458	static int ps_get_cur_chrage_cntl_limit(struct thermal_cooling_device *tcd,
	459	unsigned long *state)
	460	{
	461	struct power_supply *psy;
	462	union power_supply_propval val;
	463	int ret;
	464
	465	psy = tcd->devdata;
	466	ret = psy->get_property(psy,
	467	POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT, &val);
	468	if (!ret)
	469	*state = val.intval;
	470
	471	return ret;
	472	}
	473
	474	static int ps_set_cur_charge_cntl_limit(struct thermal_cooling_device *tcd,
	475	unsigned long state)
	476	{
	477	struct power_supply *psy;
	478	union power_supply_propval val;
	479	int ret;
	480
	481	psy = tcd->devdata;
	482	val.intval = state;
	483	ret = psy->set_property(psy,
	484	POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT, &val);
	485
	486	return ret;
	487	}
	488
	489	static struct thermal_cooling_device_ops psy_tcd_ops = {
	490	.get_max_state = ps_get_max_charge_cntl_limit,
	491	.get_cur_state = ps_get_cur_chrage_cntl_limit,
	492	.set_cur_state = ps_set_cur_charge_cntl_limit,
	493	};
	494
	495	static int psy_register_cooler(struct power_supply *psy)
	496	{
	497	int i;
	498
	499	/* Register for cooling device if psy can control charging */
	500	for (i = 0; i < psy->num_properties; i++) {
	501	if (psy->properties[i] ==
	502	POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT) {
	503	psy->tcd = thermal_cooling_device_register(
504	(char *)psy->name,
505	psy, &psy_tcd_ops);
506	if (IS_ERR(psy->tcd))
507	return PTR_ERR(psy->tcd);
508	break;
509	}
510	}
511	return 0;
512	}
513
514	static void psy_unregister_cooler(struct power_supply *psy)
515	{
516	if (IS_ERR_OR_NULL(psy->tcd))
517	return;
518	thermal_cooling_device_unregister(psy->tcd);
519	}
3be330bf JT	520	#else
	521	static int psy_register_thermal(struct power_supply *psy)
	522	{
	523	return 0;
	524	}
	525
	526	static void psy_unregister_thermal(struct power_supply *psy)
	527	{
	528	}
952aeeb3 RP	529
	530	static int psy_register_cooler(struct power_supply *psy)
	531	{
	532	return 0;
	533	}
	534
	535	static void psy_unregister_cooler(struct power_supply *psy)
	536	{
	537	}
3be330bf JT	538	#endif
3be330bf JT	539
4a11b59d AV	540	int power_supply_register(struct device parent, struct power_supply psy)
4a11b59d AV	541	{
5f487cd3 AV	542	struct device *dev;
5f487cd3 AV	543	int rc;
4a11b59d	544
5f487cd3 AV	545	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
	546	if (!dev)
	547	return -ENOMEM;
4a11b59d	548
5f487cd3	549	device_initialize(dev);
4a11b59d	550
5f487cd3 AV	551	dev->class = power_supply_class;
	552	dev->type = &power_supply_dev_type;
	553	dev->parent = parent;
	554	dev->release = power_supply_dev_release;
	555	dev_set_drvdata(dev, psy);
	556	psy->dev = dev;
	557
80c6463e SK	558	rc = dev_set_name(dev, "%s", psy->name);
	559	if (rc)
	560	goto dev_set_name_failed;
	561
97774672 LPC	562	INIT_WORK(&psy->changed_work, power_supply_changed_work);
97774672 LPC	563
f6e0b081 RK	564	rc = power_supply_check_supplies(psy);
	565	if (rc) {
	566	dev_info(dev, "Not all required supplies found, defer probe\n");
	567	goto check_supplies_failed;
	568	}
	569
948dcf96 ZM	570	spin_lock_init(&psy->changed_lock);
	571	rc = device_init_wakeup(dev, true);
	572	if (rc)
	573	goto wakeup_init_failed;
	574
5f487cd3	575	rc = device_add(dev);
4a11b59d	576	if (rc)
5f487cd3 AV	577	goto device_add_failed;
5f487cd3 AV	578
3be330bf JT	579	rc = psy_register_thermal(psy);
	580	if (rc)
	581	goto register_thermal_failed;
	582
952aeeb3 RP	583	rc = psy_register_cooler(psy);
	584	if (rc)
	585	goto register_cooler_failed;
	586
4a11b59d AV	587	rc = power_supply_create_triggers(psy);
	588	if (rc)
	589	goto create_triggers_failed;
	590
	591	power_supply_changed(psy);
	592
	593	goto success;
	594
	595	create_triggers_failed:
952aeeb3 RP	596	psy_unregister_cooler(psy);
952aeeb3 RP	597	register_cooler_failed:
3be330bf JT	598	psy_unregister_thermal(psy);
3be330bf JT	599	register_thermal_failed:
3a2dbd61	600	device_del(dev);
5f487cd3	601	device_add_failed:
80c6463e	602	wakeup_init_failed:
f6e0b081	603	check_supplies_failed:
80c6463e	604	dev_set_name_failed:
3a2dbd61	605	put_device(dev);
4a11b59d AV	606	success:
	607	return rc;
	608	}
ff3417e7	609	EXPORT_SYMBOL_GPL(power_supply_register);
4a11b59d AV	610
	611	void power_supply_unregister(struct power_supply *psy)
	612	{
bc51e7ff	613	cancel_work_sync(&psy->changed_work);
83516651	614	sysfs_remove_link(&psy->dev->kobj, "powers");
4a11b59d	615	power_supply_remove_triggers(psy);
952aeeb3	616	psy_unregister_cooler(psy);
3be330bf	617	psy_unregister_thermal(psy);
948dcf96	618	device_init_wakeup(psy->dev, false);
4a11b59d	619	device_unregister(psy->dev);
4a11b59d	620	}
ff3417e7	621	EXPORT_SYMBOL_GPL(power_supply_unregister);
4a11b59d AV	622
	623	static int __init power_supply_class_init(void)
	624	{
	625	power_supply_class = class_create(THIS_MODULE, "power_supply");
	626
	627	if (IS_ERR(power_supply_class))
	628	return PTR_ERR(power_supply_class);
	629
	630	power_supply_class->dev_uevent = power_supply_uevent;
5f487cd3	631	power_supply_init_attrs(&power_supply_dev_type);
4a11b59d AV	632
	633	return 0;
	634	}
	635
	636	static void __exit power_supply_class_exit(void)
	637	{
	638	class_destroy(power_supply_class);
4a11b59d AV	639	}
4a11b59d AV	640
4a11b59d AV	641	subsys_initcall(power_supply_class_init);
	642	module_exit(power_supply_class_exit);
	643
	644	MODULE_DESCRIPTION("Universal power supply monitor class");
	645	MODULE_AUTHOR("Ian Molton <spyro@f2s.com>, "
	646	"Szabolcs Gyurko, "
	647	"Anton Vorontsov <cbou@mail.ru>");
	648	MODULE_LICENSE("GPL");