[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/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);

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)
{
	struct power_supply *psy = container_of(work, struct power_supply,
						changed_work);

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

	class_for_each_device(power_supply_class, NULL, psy,
			      __power_supply_changed_work);

	power_supply_update_leds(psy);

	kobject_uevent(&psy->dev->kobj, KOBJ_CHANGE);
}

void power_supply_changed(struct power_supply *psy)
{
	dev_dbg(psy->dev, "%s\n", __func__);

	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);

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);
}

#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;

	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;
	}

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