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