[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 = 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 = 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)
			break;

		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 = data;
	struct power_supply *epsy = dev_get_drvdata(dev);

	/* returning non-zero breaks out of class_for_each_device loop */
	if (epsy->of_node == np)
		return 1;

	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;

	/*
	 * class_for_each_device() either returns its own errors or values
	 * returned by __power_supply_find_supply_from_node().
	 *
	 * __power_supply_find_supply_from_node() will return 0 (no match)
	 * or 1 (match).
	 *
	 * We return 0 if class_for_each_device() returned 1, -EPROBE_DEFER if
	 * it returned 0, or error as returned by it.
	 */
	error = class_for_each_device(power_supply_class, NULL, supply_node,
				       __power_supply_find_supply_from_node);

	return error ? (error == 1 ? 0 : error) : -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)
			break;

		ret = power_supply_find_supply_from_node(np);
		of_node_put(np);

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

	/* Missing valid "power-supplies" entries */
	if (cnt == 1)
		return 0;

	/* 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 - 1),
					   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 = 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))
			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 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

static int __power_supply_register(struct device *parent,
				   struct power_supply *psy, bool ws)
{
	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, ws);
	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;
}

int power_supply_register(struct device *parent, struct power_supply *psy)
{
	return __power_supply_register(parent, psy, true);
}
EXPORT_SYMBOL_GPL(power_supply_register);

int power_supply_register_no_ws(struct device *parent, struct power_supply *psy)
{
	return __power_supply_register(parent, psy, false);
}
EXPORT_SYMBOL_GPL(power_supply_register_no_ws);

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)
443cad92 DY	60	{
e80cf421	61	struct power_supply *psy = data;
443cad92	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	{
e80cf421	122	struct power_supply *psy = data;
f6e0b081 RK	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)
a0f93b42	130	break;
f6e0b081 RK	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	{
e80cf421	161	struct device_node *np = data;
f6e0b081 RK	162	struct power_supply *epsy = dev_get_drvdata(dev);
f6e0b081 RK	163
585b0087	164	/* returning non-zero breaks out of class_for_each_device loop */
f6e0b081	165	if (epsy->of_node == np)
585b0087	166	return 1;
f6e0b081 RK	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	/*
585b0087 VK	189	* class_for_each_device() either returns its own errors or values
	190	* returned by __power_supply_find_supply_from_node().
	191	*
	192	* __power_supply_find_supply_from_node() will return 0 (no match)
	193	* or 1 (match).
	194	*
	195	* We return 0 if class_for_each_device() returned 1, -EPROBE_DEFER if
	196	* it returned 0, or error as returned by it.
f6e0b081 RK	197	*/
	198	error = class_for_each_device(power_supply_class, NULL, supply_node,
	199	__power_supply_find_supply_from_node);
	200
585b0087	201	return error ? (error == 1 ? 0 : error) : -EPROBE_DEFER;
f6e0b081 RK	202	}
	203
	204	static int power_supply_check_supplies(struct power_supply *psy)
	205	{
	206	struct device_node *np;
	207	int cnt = 0;
	208
	209	/* If there is already a list honor it */
	210	if (psy->supplied_from && psy->num_supplies > 0)
	211	return 0;
	212
	213	/* No device node found, nothing to do */
	214	if (!psy->of_node)
	215	return 0;
	216
	217	do {
	218	int ret;
	219
	220	np = of_parse_phandle(psy->of_node, "power-supplies", cnt++);
	221	if (!np)
a0f93b42	222	break;
f6e0b081 RK	223
f6e0b081 RK	224	ret = power_supply_find_supply_from_node(np);
8468b029 VK	225	of_node_put(np);
8468b029 VK	226
f6e0b081	227	if (ret) {
f5b89aff VK	228	dev_dbg(psy->dev, "Failed to find supply!\n");
f5b89aff VK	229	return ret;
f6e0b081 RK	230	}
	231	} while (np);
	232
f9c85486 VK	233	/* Missing valid "power-supplies" entries */
	234	if (cnt == 1)
	235	return 0;
	236
f6e0b081 RK	237	/* All supplies found, allocate char ** array for filling */
	238	psy->supplied_from = devm_kzalloc(psy->dev, sizeof(psy->supplied_from),
	239	GFP_KERNEL);
	240	if (!psy->supplied_from) {
	241	dev_err(psy->dev, "Couldn't allocate memory for supply list\n");
	242	return -ENOMEM;
	243	}
	244
8f5a37cb	245	psy->supplied_from = devm_kzalloc(psy->dev, sizeof(char ) * (cnt - 1),
f6e0b081 RK	246	GFP_KERNEL);
	247	if (!*psy->supplied_from) {
	248	dev_err(psy->dev, "Couldn't allocate memory for supply list\n");
	249	return -ENOMEM;
	250	}
	251
	252	return power_supply_populate_supplied_from(psy);
	253	}
	254	#else
	255	static inline int power_supply_check_supplies(struct power_supply *psy)
	256	{
	257	return 0;
	258	}
	259	#endif
	260
443cad92	261	static int __power_supply_am_i_supplied(struct device dev, void data)
4a11b59d AV	262	{
4a11b59d AV	263	union power_supply_propval ret = {0,};
e80cf421	264	struct power_supply *psy = data;
443cad92	265	struct power_supply *epsy = dev_get_drvdata(dev);
443cad92	266
5e0848c6	267	if (__power_supply_is_supplied_by(epsy, psy))
1c42a389 VK	268	if (!epsy->get_property(epsy, POWER_SUPPLY_PROP_ONLINE, &ret))
1c42a389 VK	269	return ret.intval;
5e0848c6	270
443cad92 DY	271	return 0;
	272	}
	273
	274	int power_supply_am_i_supplied(struct power_supply *psy)
	275	{
	276	int error;
	277
93562b53	278	error = class_for_each_device(power_supply_class, NULL, psy,
443cad92	279	__power_supply_am_i_supplied);
4a11b59d	280
0cddc0a9	281	dev_dbg(psy->dev, "%s %d\n", __func__, error);
4a11b59d	282
443cad92	283	return error;
4a11b59d	284	}
ff3417e7	285	EXPORT_SYMBOL_GPL(power_supply_am_i_supplied);
4a11b59d	286
942ed161 MG	287	static int __power_supply_is_system_supplied(struct device dev, void data)
	288	{
	289	union power_supply_propval ret = {0,};
	290	struct power_supply *psy = dev_get_drvdata(dev);
2530daa1	291	unsigned int *count = data;
942ed161	292
2530daa1	293	(*count)++;
1c42a389 VK	294	if (psy->type != POWER_SUPPLY_TYPE_BATTERY)
1c42a389 VK	295	if (!psy->get_property(psy, POWER_SUPPLY_PROP_ONLINE, &ret))
942ed161	296	return ret.intval;
1c42a389	297
942ed161 MG	298	return 0;
	299	}
	300
	301	int power_supply_is_system_supplied(void)
	302	{
	303	int error;
2530daa1	304	unsigned int count = 0;
942ed161	305
2530daa1	306	error = class_for_each_device(power_supply_class, NULL, &count,
942ed161 MG	307	__power_supply_is_system_supplied);
942ed161 MG	308
2530daa1 JD	309	/*
	310	* If no power class device was found at all, most probably we are
	311	* running on a desktop system, so assume we are on mains power.
	312	*/
	313	if (count == 0)
	314	return 1;
	315
942ed161 MG	316	return error;
942ed161 MG	317	}
ff3417e7	318	EXPORT_SYMBOL_GPL(power_supply_is_system_supplied);
942ed161	319
e5f5ccb6 DM	320	int power_supply_set_battery_charged(struct power_supply *psy)
	321	{
	322	if (psy->type == POWER_SUPPLY_TYPE_BATTERY && psy->set_charged) {
	323	psy->set_charged(psy);
	324	return 0;
	325	}
	326
	327	return -EINVAL;
	328	}
	329	EXPORT_SYMBOL_GPL(power_supply_set_battery_charged);
	330
9f3b795a	331	static int power_supply_match_device_by_name(struct device dev, const void data)
e5f5ccb6 DM	332	{
	333	const char *name = data;
	334	struct power_supply *psy = dev_get_drvdata(dev);
	335
	336	return strcmp(psy->name, name) == 0;
	337	}
	338
9f3b795a	339	struct power_supply power_supply_get_by_name(const char name)
e5f5ccb6 DM	340	{
	341	struct device *dev = class_find_device(power_supply_class, NULL, name,
	342	power_supply_match_device_by_name);
	343
	344	return dev ? dev_get_drvdata(dev) : NULL;
	345	}
	346	EXPORT_SYMBOL_GPL(power_supply_get_by_name);
	347
abce9770 SR	348	#ifdef CONFIG_OF
	349	static int power_supply_match_device_node(struct device dev, const void data)
	350	{
	351	return dev->parent && dev->parent->of_node == data;
	352	}
	353
	354	struct power_supply power_supply_get_by_phandle(struct device_node np,
	355	const char *property)
	356	{
	357	struct device_node *power_supply_np;
	358	struct device *dev;
	359
	360	power_supply_np = of_parse_phandle(np, property, 0);
	361	if (!power_supply_np)
	362	return ERR_PTR(-ENODEV);
	363
	364	dev = class_find_device(power_supply_class, NULL, power_supply_np,
	365	power_supply_match_device_node);
	366
	367	of_node_put(power_supply_np);
	368
	369	return dev ? dev_get_drvdata(dev) : NULL;
	370	}
	371	EXPORT_SYMBOL_GPL(power_supply_get_by_phandle);
	372	#endif /* CONFIG_OF */
	373
83516651 JF	374	int power_supply_powers(struct power_supply psy, struct device dev)
83516651 JF	375	{
93278d15	376	return sysfs_create_link(&psy->dev->kobj, &dev->kobj, "powers");
83516651 JF	377	}
	378	EXPORT_SYMBOL_GPL(power_supply_powers);
	379
5f487cd3 AV	380	static void power_supply_dev_release(struct device *dev)
	381	{
	382	pr_debug("device: '%s': %s\n", dev_name(dev), __func__);
	383	kfree(dev);
	384	}
	385
d36240d2 PR	386	int power_supply_reg_notifier(struct notifier_block *nb)
	387	{
	388	return atomic_notifier_chain_register(&power_supply_notifier, nb);
	389	}
	390	EXPORT_SYMBOL_GPL(power_supply_reg_notifier);
	391
	392	void power_supply_unreg_notifier(struct notifier_block *nb)
	393	{
	394	atomic_notifier_chain_unregister(&power_supply_notifier, nb);
	395	}
	396	EXPORT_SYMBOL_GPL(power_supply_unreg_notifier);
	397
3be330bf JT	398	#ifdef CONFIG_THERMAL
	399	static int power_supply_read_temp(struct thermal_zone_device *tzd,
	400	unsigned long *temp)
	401	{
	402	struct power_supply *psy;
	403	union power_supply_propval val;
	404	int ret;
	405
	406	WARN_ON(tzd == NULL);
	407	psy = tzd->devdata;
	408	ret = psy->get_property(psy, POWER_SUPPLY_PROP_TEMP, &val);
	409
	410	/* Convert tenths of degree Celsius to milli degree Celsius. */
	411	if (!ret)
	412	temp = val.intval 100;
	413
	414	return ret;
	415	}
	416
	417	static struct thermal_zone_device_ops psy_tzd_ops = {
	418	.get_temp = power_supply_read_temp,
	419	};
	420
	421	static int psy_register_thermal(struct power_supply *psy)
	422	{
	423	int i;
	424
	425	/* Register battery zone device psy reports temperature */
	426	for (i = 0; i < psy->num_properties; i++) {
	427	if (psy->properties[i] == POWER_SUPPLY_PROP_TEMP) {
e6db06a5	428	psy->tzd = thermal_zone_device_register(psy->name, 0, 0,
50125a9b	429	psy, &psy_tzd_ops, NULL, 0, 0);
3be330bf JT	430	if (IS_ERR(psy->tzd))
	431	return PTR_ERR(psy->tzd);
	432	break;
	433	}
	434	}
	435	return 0;
	436	}
	437
	438	static void psy_unregister_thermal(struct power_supply *psy)
	439	{
	440	if (IS_ERR_OR_NULL(psy->tzd))
	441	return;
	442	thermal_zone_device_unregister(psy->tzd);
	443	}
952aeeb3 RP	444
	445	/* thermal cooling device callbacks */
	446	static int ps_get_max_charge_cntl_limit(struct thermal_cooling_device *tcd,
	447	unsigned long *state)
	448	{
	449	struct power_supply *psy;
	450	union power_supply_propval val;
	451	int ret;
	452
	453	psy = tcd->devdata;
	454	ret = psy->get_property(psy,
	455	POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT_MAX, &val);
	456	if (!ret)
	457	*state = val.intval;
	458
	459	return ret;
	460	}
	461
	462	static int ps_get_cur_chrage_cntl_limit(struct thermal_cooling_device *tcd,
	463	unsigned long *state)
	464	{
	465	struct power_supply *psy;
	466	union power_supply_propval val;
	467	int ret;
	468
	469	psy = tcd->devdata;
	470	ret = psy->get_property(psy,
	471	POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT, &val);
	472	if (!ret)
	473	*state = val.intval;
	474
	475	return ret;
	476	}
	477
	478	static int ps_set_cur_charge_cntl_limit(struct thermal_cooling_device *tcd,
	479	unsigned long state)
	480	{
	481	struct power_supply *psy;
	482	union power_supply_propval val;
	483	int ret;
	484
	485	psy = tcd->devdata;
	486	val.intval = state;
	487	ret = psy->set_property(psy,
	488	POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT, &val);
	489
	490	return ret;
	491	}
	492
	493	static struct thermal_cooling_device_ops psy_tcd_ops = {
	494	.get_max_state = ps_get_max_charge_cntl_limit,
	495	.get_cur_state = ps_get_cur_chrage_cntl_limit,
	496	.set_cur_state = ps_set_cur_charge_cntl_limit,
	497	};
	498
	499	static int psy_register_cooler(struct power_supply *psy)
	500	{
	501	int i;
	502
	503	/* Register for cooling device if psy can control charging */
	504	for (i = 0; i < psy->num_properties; i++) {
	505	if (psy->properties[i] ==
	506	POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT) {
	507	psy->tcd = thermal_cooling_device_register(
508	(char *)psy->name,
509	psy, &psy_tcd_ops);
510	if (IS_ERR(psy->tcd))
511	return PTR_ERR(psy->tcd);
512	break;
513	}
514	}
515	return 0;
516	}
517
518	static void psy_unregister_cooler(struct power_supply *psy)
519	{
520	if (IS_ERR_OR_NULL(psy->tcd))
521	return;
522	thermal_cooling_device_unregister(psy->tcd);
523	}
3be330bf JT	524	#else
	525	static int psy_register_thermal(struct power_supply *psy)
	526	{
	527	return 0;
	528	}
	529
	530	static void psy_unregister_thermal(struct power_supply *psy)
	531	{
	532	}
952aeeb3 RP	533
	534	static int psy_register_cooler(struct power_supply *psy)
	535	{
	536	return 0;
	537	}
	538
	539	static void psy_unregister_cooler(struct power_supply *psy)
	540	{
	541	}
3be330bf JT	542	#endif
3be330bf JT	543
c128d397 WY	544	static int __power_supply_register(struct device *parent,
c128d397 WY	545	struct power_supply *psy, bool ws)
4a11b59d	546	{
5f487cd3 AV	547	struct device *dev;
5f487cd3 AV	548	int rc;
4a11b59d	549
5f487cd3 AV	550	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
	551	if (!dev)
	552	return -ENOMEM;
4a11b59d	553
5f487cd3	554	device_initialize(dev);
4a11b59d	555
5f487cd3 AV	556	dev->class = power_supply_class;
	557	dev->type = &power_supply_dev_type;
	558	dev->parent = parent;
	559	dev->release = power_supply_dev_release;
	560	dev_set_drvdata(dev, psy);
	561	psy->dev = dev;
	562
80c6463e SK	563	rc = dev_set_name(dev, "%s", psy->name);
	564	if (rc)
	565	goto dev_set_name_failed;
	566
97774672 LPC	567	INIT_WORK(&psy->changed_work, power_supply_changed_work);
97774672 LPC	568
f6e0b081 RK	569	rc = power_supply_check_supplies(psy);
	570	if (rc) {
	571	dev_info(dev, "Not all required supplies found, defer probe\n");
	572	goto check_supplies_failed;
	573	}
	574
948dcf96	575	spin_lock_init(&psy->changed_lock);
9113e260	576	rc = device_init_wakeup(dev, ws);
948dcf96 ZM	577	if (rc)
	578	goto wakeup_init_failed;
	579
5f487cd3	580	rc = device_add(dev);
4a11b59d	581	if (rc)
5f487cd3 AV	582	goto device_add_failed;
5f487cd3 AV	583
3be330bf JT	584	rc = psy_register_thermal(psy);
	585	if (rc)
	586	goto register_thermal_failed;
	587
952aeeb3 RP	588	rc = psy_register_cooler(psy);
	589	if (rc)
	590	goto register_cooler_failed;
	591
4a11b59d AV	592	rc = power_supply_create_triggers(psy);
	593	if (rc)
	594	goto create_triggers_failed;
	595
	596	power_supply_changed(psy);
	597
	598	goto success;
	599
	600	create_triggers_failed:
952aeeb3 RP	601	psy_unregister_cooler(psy);
952aeeb3 RP	602	register_cooler_failed:
3be330bf JT	603	psy_unregister_thermal(psy);
3be330bf JT	604	register_thermal_failed:
3a2dbd61	605	device_del(dev);
5f487cd3	606	device_add_failed:
80c6463e	607	wakeup_init_failed:
f6e0b081	608	check_supplies_failed:
80c6463e	609	dev_set_name_failed:
3a2dbd61	610	put_device(dev);
4a11b59d AV	611	success:
	612	return rc;
	613	}
9113e260 ZR	614
	615	int power_supply_register(struct device parent, struct power_supply psy)
	616	{
	617	return __power_supply_register(parent, psy, true);
	618	}
ff3417e7	619	EXPORT_SYMBOL_GPL(power_supply_register);
4a11b59d	620
9113e260 ZR	621	int power_supply_register_no_ws(struct device parent, struct power_supply psy)
	622	{
	623	return __power_supply_register(parent, psy, false);
	624	}
	625	EXPORT_SYMBOL_GPL(power_supply_register_no_ws);
	626
4a11b59d AV	627	void power_supply_unregister(struct power_supply *psy)
4a11b59d AV	628	{
bc51e7ff	629	cancel_work_sync(&psy->changed_work);
83516651	630	sysfs_remove_link(&psy->dev->kobj, "powers");
4a11b59d	631	power_supply_remove_triggers(psy);
952aeeb3	632	psy_unregister_cooler(psy);
3be330bf	633	psy_unregister_thermal(psy);
948dcf96	634	device_init_wakeup(psy->dev, false);
4a11b59d	635	device_unregister(psy->dev);
4a11b59d	636	}
ff3417e7	637	EXPORT_SYMBOL_GPL(power_supply_unregister);
4a11b59d AV	638
	639	static int __init power_supply_class_init(void)
	640	{
	641	power_supply_class = class_create(THIS_MODULE, "power_supply");
	642
	643	if (IS_ERR(power_supply_class))
	644	return PTR_ERR(power_supply_class);
	645
	646	power_supply_class->dev_uevent = power_supply_uevent;
5f487cd3	647	power_supply_init_attrs(&power_supply_dev_type);
4a11b59d AV	648
	649	return 0;
	650	}
	651
	652	static void __exit power_supply_class_exit(void)
	653	{
	654	class_destroy(power_supply_class);
4a11b59d AV	655	}
4a11b59d AV	656
4a11b59d AV	657	subsys_initcall(power_supply_class_init);
	658	module_exit(power_supply_class_exit);
	659
	660	MODULE_DESCRIPTION("Universal power supply monitor class");
	661	MODULE_AUTHOR("Ian Molton <spyro@f2s.com>, "
	662	"Szabolcs Gyurko, "
	663	"Anton Vorontsov <cbou@mail.ru>");
	664	MODULE_LICENSE("GPL");