2 * Universal power supply monitor class
4 * Copyright © 2007 Anton Vorontsov <cbou@mail.ru>
5 * Copyright © 2004 Szabolcs Gyurko
6 * Copyright © 2003 Ian Molton <spyro@f2s.com>
8 * Modified: 2004, Oct Szabolcs Gyurko
10 * You may use this code as per GPL version 2
13 #include <linux/module.h>
14 #include <linux/types.h>
15 #include <linux/init.h>
16 #include <linux/slab.h>
17 #include <linux/device.h>
18 #include <linux/err.h>
19 #include <linux/power_supply.h>
20 #include <linux/thermal.h>
21 #include "power_supply.h"
23 /* exported for the APM Power driver, APM emulation */
24 struct class *power_supply_class;
25 EXPORT_SYMBOL_GPL(power_supply_class);
27 static struct device_type power_supply_dev_type;
29 static bool __power_supply_is_supplied_by(struct power_supply *supplier,
30 struct power_supply *supply)
34 if (!supply->supplied_from && !supplier->supplied_to)
37 /* Support both supplied_to and supplied_from modes */
38 if (supply->supplied_from) {
41 for (i = 0; i < supply->num_supplies; i++)
42 if (!strcmp(supplier->name, supply->supplied_from[i]))
47 for (i = 0; i < supplier->num_supplicants; i++)
48 if (!strcmp(supplier->supplied_to[i], supply->name))
55 static int __power_supply_changed_work(struct device *dev, void *data)
57 struct power_supply *psy = (struct power_supply *)data;
58 struct power_supply *pst = dev_get_drvdata(dev);
60 if (__power_supply_is_supplied_by(psy, pst)) {
61 if (pst->external_power_changed)
62 pst->external_power_changed(pst);
68 static void power_supply_changed_work(struct work_struct *work)
71 struct power_supply *psy = container_of(work, struct power_supply,
74 dev_dbg(psy->dev, "%s\n", __func__);
76 spin_lock_irqsave(&psy->changed_lock, flags);
79 spin_unlock_irqrestore(&psy->changed_lock, flags);
81 class_for_each_device(power_supply_class, NULL, psy,
82 __power_supply_changed_work);
84 power_supply_update_leds(psy);
86 kobject_uevent(&psy->dev->kobj, KOBJ_CHANGE);
87 spin_lock_irqsave(&psy->changed_lock, flags);
91 spin_unlock_irqrestore(&psy->changed_lock, flags);
94 void power_supply_changed(struct power_supply *psy)
98 dev_dbg(psy->dev, "%s\n", __func__);
100 spin_lock_irqsave(&psy->changed_lock, flags);
102 pm_stay_awake(psy->dev);
103 spin_unlock_irqrestore(&psy->changed_lock, flags);
104 schedule_work(&psy->changed_work);
106 EXPORT_SYMBOL_GPL(power_supply_changed);
109 #include <linux/of.h>
111 static int __power_supply_populate_supplied_from(struct device *dev,
114 struct power_supply *psy = (struct power_supply *)data;
115 struct power_supply *epsy = dev_get_drvdata(dev);
116 struct device_node *np;
120 np = of_parse_phandle(psy->of_node, "power-supplies", i++);
124 if (np == epsy->of_node) {
125 dev_info(psy->dev, "%s: Found supply : %s\n",
126 psy->name, epsy->name);
127 psy->supplied_from[i-1] = (char *)epsy->name;
136 static int power_supply_populate_supplied_from(struct power_supply *psy)
140 error = class_for_each_device(power_supply_class, NULL, psy,
141 __power_supply_populate_supplied_from);
143 dev_dbg(psy->dev, "%s %d\n", __func__, error);
148 static int __power_supply_find_supply_from_node(struct device *dev,
151 struct device_node *np = (struct device_node *)data;
152 struct power_supply *epsy = dev_get_drvdata(dev);
154 /* return error breaks out of class_for_each_device loop */
155 if (epsy->of_node == np)
161 static int power_supply_find_supply_from_node(struct device_node *supply_node)
165 struct class_dev_iter iter;
168 * Use iterator to see if any other device is registered.
169 * This is required since class_for_each_device returns 0
170 * if there are no devices registered.
172 class_dev_iter_init(&iter, power_supply_class, NULL, NULL);
173 dev = class_dev_iter_next(&iter);
176 return -EPROBE_DEFER;
179 * We have to treat the return value as inverted, because if
180 * we return error on not found, then it won't continue looking.
181 * So we trick it by returning error on success to stop looking
182 * once the matching device is found.
184 error = class_for_each_device(power_supply_class, NULL, supply_node,
185 __power_supply_find_supply_from_node);
187 return error ? 0 : -EPROBE_DEFER;
190 static int power_supply_check_supplies(struct power_supply *psy)
192 struct device_node *np;
195 /* If there is already a list honor it */
196 if (psy->supplied_from && psy->num_supplies > 0)
199 /* No device node found, nothing to do */
206 np = of_parse_phandle(psy->of_node, "power-supplies", cnt++);
210 ret = power_supply_find_supply_from_node(np);
212 dev_dbg(psy->dev, "Failed to find supply, defer!\n");
213 return -EPROBE_DEFER;
217 /* All supplies found, allocate char ** array for filling */
218 psy->supplied_from = devm_kzalloc(psy->dev, sizeof(psy->supplied_from),
220 if (!psy->supplied_from) {
221 dev_err(psy->dev, "Couldn't allocate memory for supply list\n");
225 *psy->supplied_from = devm_kzalloc(psy->dev, sizeof(char *) * cnt,
227 if (!*psy->supplied_from) {
228 dev_err(psy->dev, "Couldn't allocate memory for supply list\n");
232 return power_supply_populate_supplied_from(psy);
235 static inline int power_supply_check_supplies(struct power_supply *psy)
241 static int __power_supply_am_i_supplied(struct device *dev, void *data)
243 union power_supply_propval ret = {0,};
244 struct power_supply *psy = (struct power_supply *)data;
245 struct power_supply *epsy = dev_get_drvdata(dev);
247 if (__power_supply_is_supplied_by(epsy, psy))
248 if (!epsy->get_property(epsy, POWER_SUPPLY_PROP_ONLINE, &ret)) {
256 int power_supply_am_i_supplied(struct power_supply *psy)
260 error = class_for_each_device(power_supply_class, NULL, psy,
261 __power_supply_am_i_supplied);
263 dev_dbg(psy->dev, "%s %d\n", __func__, error);
267 EXPORT_SYMBOL_GPL(power_supply_am_i_supplied);
269 static int __power_supply_is_system_supplied(struct device *dev, void *data)
271 union power_supply_propval ret = {0,};
272 struct power_supply *psy = dev_get_drvdata(dev);
273 unsigned int *count = data;
276 if (psy->type != POWER_SUPPLY_TYPE_BATTERY) {
277 if (psy->get_property(psy, POWER_SUPPLY_PROP_ONLINE, &ret))
285 int power_supply_is_system_supplied(void)
288 unsigned int count = 0;
290 error = class_for_each_device(power_supply_class, NULL, &count,
291 __power_supply_is_system_supplied);
294 * If no power class device was found at all, most probably we are
295 * running on a desktop system, so assume we are on mains power.
302 EXPORT_SYMBOL_GPL(power_supply_is_system_supplied);
304 int power_supply_set_battery_charged(struct power_supply *psy)
306 if (psy->type == POWER_SUPPLY_TYPE_BATTERY && psy->set_charged) {
307 psy->set_charged(psy);
313 EXPORT_SYMBOL_GPL(power_supply_set_battery_charged);
315 static int power_supply_match_device_by_name(struct device *dev, const void *data)
317 const char *name = data;
318 struct power_supply *psy = dev_get_drvdata(dev);
320 return strcmp(psy->name, name) == 0;
323 struct power_supply *power_supply_get_by_name(const char *name)
325 struct device *dev = class_find_device(power_supply_class, NULL, name,
326 power_supply_match_device_by_name);
328 return dev ? dev_get_drvdata(dev) : NULL;
330 EXPORT_SYMBOL_GPL(power_supply_get_by_name);
332 int power_supply_powers(struct power_supply *psy, struct device *dev)
334 return sysfs_create_link(&psy->dev->kobj, &dev->kobj, "powers");
336 EXPORT_SYMBOL_GPL(power_supply_powers);
338 static void power_supply_dev_release(struct device *dev)
340 pr_debug("device: '%s': %s\n", dev_name(dev), __func__);
344 #ifdef CONFIG_THERMAL
345 static int power_supply_read_temp(struct thermal_zone_device *tzd,
348 struct power_supply *psy;
349 union power_supply_propval val;
352 WARN_ON(tzd == NULL);
354 ret = psy->get_property(psy, POWER_SUPPLY_PROP_TEMP, &val);
356 /* Convert tenths of degree Celsius to milli degree Celsius. */
358 *temp = val.intval * 100;
363 static struct thermal_zone_device_ops psy_tzd_ops = {
364 .get_temp = power_supply_read_temp,
367 static int psy_register_thermal(struct power_supply *psy)
371 /* Register battery zone device psy reports temperature */
372 for (i = 0; i < psy->num_properties; i++) {
373 if (psy->properties[i] == POWER_SUPPLY_PROP_TEMP) {
374 psy->tzd = thermal_zone_device_register(psy->name, 0, 0,
375 psy, &psy_tzd_ops, NULL, 0, 0);
376 if (IS_ERR(psy->tzd))
377 return PTR_ERR(psy->tzd);
384 static void psy_unregister_thermal(struct power_supply *psy)
386 if (IS_ERR_OR_NULL(psy->tzd))
388 thermal_zone_device_unregister(psy->tzd);
391 /* thermal cooling device callbacks */
392 static int ps_get_max_charge_cntl_limit(struct thermal_cooling_device *tcd,
393 unsigned long *state)
395 struct power_supply *psy;
396 union power_supply_propval val;
400 ret = psy->get_property(psy,
401 POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT_MAX, &val);
408 static int ps_get_cur_chrage_cntl_limit(struct thermal_cooling_device *tcd,
409 unsigned long *state)
411 struct power_supply *psy;
412 union power_supply_propval val;
416 ret = psy->get_property(psy,
417 POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT, &val);
424 static int ps_set_cur_charge_cntl_limit(struct thermal_cooling_device *tcd,
427 struct power_supply *psy;
428 union power_supply_propval val;
433 ret = psy->set_property(psy,
434 POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT, &val);
439 static struct thermal_cooling_device_ops psy_tcd_ops = {
440 .get_max_state = ps_get_max_charge_cntl_limit,
441 .get_cur_state = ps_get_cur_chrage_cntl_limit,
442 .set_cur_state = ps_set_cur_charge_cntl_limit,
445 static int psy_register_cooler(struct power_supply *psy)
449 /* Register for cooling device if psy can control charging */
450 for (i = 0; i < psy->num_properties; i++) {
451 if (psy->properties[i] ==
452 POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT) {
453 psy->tcd = thermal_cooling_device_register(
456 if (IS_ERR(psy->tcd))
457 return PTR_ERR(psy->tcd);
464 static void psy_unregister_cooler(struct power_supply *psy)
466 if (IS_ERR_OR_NULL(psy->tcd))
468 thermal_cooling_device_unregister(psy->tcd);
471 static int psy_register_thermal(struct power_supply *psy)
476 static void psy_unregister_thermal(struct power_supply *psy)
480 static int psy_register_cooler(struct power_supply *psy)
485 static void psy_unregister_cooler(struct power_supply *psy)
490 int power_supply_register(struct device *parent, struct power_supply *psy)
495 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
499 device_initialize(dev);
501 dev->class = power_supply_class;
502 dev->type = &power_supply_dev_type;
503 dev->parent = parent;
504 dev->release = power_supply_dev_release;
505 dev_set_drvdata(dev, psy);
508 INIT_WORK(&psy->changed_work, power_supply_changed_work);
510 rc = power_supply_check_supplies(psy);
512 dev_info(dev, "Not all required supplies found, defer probe\n");
513 goto check_supplies_failed;
516 rc = kobject_set_name(&dev->kobj, "%s", psy->name);
518 goto kobject_set_name_failed;
520 rc = device_add(dev);
522 goto device_add_failed;
524 spin_lock_init(&psy->changed_lock);
525 rc = device_init_wakeup(dev, true);
527 goto wakeup_init_failed;
529 rc = psy_register_thermal(psy);
531 goto register_thermal_failed;
533 rc = psy_register_cooler(psy);
535 goto register_cooler_failed;
537 rc = power_supply_create_triggers(psy);
539 goto create_triggers_failed;
541 power_supply_changed(psy);
545 create_triggers_failed:
546 psy_unregister_cooler(psy);
547 register_cooler_failed:
548 psy_unregister_thermal(psy);
549 register_thermal_failed:
552 kobject_set_name_failed:
554 check_supplies_failed:
559 EXPORT_SYMBOL_GPL(power_supply_register);
561 void power_supply_unregister(struct power_supply *psy)
563 cancel_work_sync(&psy->changed_work);
564 sysfs_remove_link(&psy->dev->kobj, "powers");
565 power_supply_remove_triggers(psy);
566 psy_unregister_cooler(psy);
567 psy_unregister_thermal(psy);
568 device_unregister(psy->dev);
570 EXPORT_SYMBOL_GPL(power_supply_unregister);
572 static int __init power_supply_class_init(void)
574 power_supply_class = class_create(THIS_MODULE, "power_supply");
576 if (IS_ERR(power_supply_class))
577 return PTR_ERR(power_supply_class);
579 power_supply_class->dev_uevent = power_supply_uevent;
580 power_supply_init_attrs(&power_supply_dev_type);
585 static void __exit power_supply_class_exit(void)
587 class_destroy(power_supply_class);
590 subsys_initcall(power_supply_class_init);
591 module_exit(power_supply_class_exit);
593 MODULE_DESCRIPTION("Universal power supply monitor class");
594 MODULE_AUTHOR("Ian Molton <spyro@f2s.com>, "
596 "Anton Vorontsov <cbou@mail.ru>");
597 MODULE_LICENSE("GPL");