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)
70 struct power_supply *psy = container_of(work, struct power_supply,
73 dev_dbg(psy->dev, "%s\n", __func__);
75 class_for_each_device(power_supply_class, NULL, psy,
76 __power_supply_changed_work);
78 power_supply_update_leds(psy);
80 kobject_uevent(&psy->dev->kobj, KOBJ_CHANGE);
83 void power_supply_changed(struct power_supply *psy)
85 dev_dbg(psy->dev, "%s\n", __func__);
87 schedule_work(&psy->changed_work);
89 EXPORT_SYMBOL_GPL(power_supply_changed);
94 static int __power_supply_populate_supplied_from(struct device *dev,
97 struct power_supply *psy = (struct power_supply *)data;
98 struct power_supply *epsy = dev_get_drvdata(dev);
99 struct device_node *np;
103 np = of_parse_phandle(psy->of_node, "power-supplies", i++);
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;
119 static int power_supply_populate_supplied_from(struct power_supply *psy)
123 error = class_for_each_device(power_supply_class, NULL, psy,
124 __power_supply_populate_supplied_from);
126 dev_dbg(psy->dev, "%s %d\n", __func__, error);
131 static int __power_supply_find_supply_from_node(struct device *dev,
134 struct device_node *np = (struct device_node *)data;
135 struct power_supply *epsy = dev_get_drvdata(dev);
137 /* return error breaks out of class_for_each_device loop */
138 if (epsy->of_node == np)
144 static int power_supply_find_supply_from_node(struct device_node *supply_node)
148 struct class_dev_iter iter;
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.
155 class_dev_iter_init(&iter, power_supply_class, NULL, NULL);
156 dev = class_dev_iter_next(&iter);
159 return -EPROBE_DEFER;
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.
167 error = class_for_each_device(power_supply_class, NULL, supply_node,
168 __power_supply_find_supply_from_node);
170 return error ? 0 : -EPROBE_DEFER;
173 static int power_supply_check_supplies(struct power_supply *psy)
175 struct device_node *np;
178 /* If there is already a list honor it */
179 if (psy->supplied_from && psy->num_supplies > 0)
182 /* No device node found, nothing to do */
189 np = of_parse_phandle(psy->of_node, "power-supplies", cnt++);
193 ret = power_supply_find_supply_from_node(np);
195 dev_dbg(psy->dev, "Failed to find supply, defer!\n");
196 return -EPROBE_DEFER;
200 /* All supplies found, allocate char ** array for filling */
201 psy->supplied_from = devm_kzalloc(psy->dev, sizeof(psy->supplied_from),
203 if (!psy->supplied_from) {
204 dev_err(psy->dev, "Couldn't allocate memory for supply list\n");
208 *psy->supplied_from = devm_kzalloc(psy->dev, sizeof(char *) * cnt,
210 if (!*psy->supplied_from) {
211 dev_err(psy->dev, "Couldn't allocate memory for supply list\n");
215 return power_supply_populate_supplied_from(psy);
218 static inline int power_supply_check_supplies(struct power_supply *psy)
224 static int __power_supply_am_i_supplied(struct device *dev, void *data)
226 union power_supply_propval ret = {0,};
227 struct power_supply *psy = (struct power_supply *)data;
228 struct power_supply *epsy = dev_get_drvdata(dev);
230 if (__power_supply_is_supplied_by(epsy, psy))
231 if (!epsy->get_property(epsy, POWER_SUPPLY_PROP_ONLINE, &ret)) {
239 int power_supply_am_i_supplied(struct power_supply *psy)
243 error = class_for_each_device(power_supply_class, NULL, psy,
244 __power_supply_am_i_supplied);
246 dev_dbg(psy->dev, "%s %d\n", __func__, error);
250 EXPORT_SYMBOL_GPL(power_supply_am_i_supplied);
252 static int __power_supply_is_system_supplied(struct device *dev, void *data)
254 union power_supply_propval ret = {0,};
255 struct power_supply *psy = dev_get_drvdata(dev);
256 unsigned int *count = data;
259 if (psy->type != POWER_SUPPLY_TYPE_BATTERY) {
260 if (psy->get_property(psy, POWER_SUPPLY_PROP_ONLINE, &ret))
268 int power_supply_is_system_supplied(void)
271 unsigned int count = 0;
273 error = class_for_each_device(power_supply_class, NULL, &count,
274 __power_supply_is_system_supplied);
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.
285 EXPORT_SYMBOL_GPL(power_supply_is_system_supplied);
287 int power_supply_set_battery_charged(struct power_supply *psy)
289 if (psy->type == POWER_SUPPLY_TYPE_BATTERY && psy->set_charged) {
290 psy->set_charged(psy);
296 EXPORT_SYMBOL_GPL(power_supply_set_battery_charged);
298 static int power_supply_match_device_by_name(struct device *dev, const void *data)
300 const char *name = data;
301 struct power_supply *psy = dev_get_drvdata(dev);
303 return strcmp(psy->name, name) == 0;
306 struct power_supply *power_supply_get_by_name(const char *name)
308 struct device *dev = class_find_device(power_supply_class, NULL, name,
309 power_supply_match_device_by_name);
311 return dev ? dev_get_drvdata(dev) : NULL;
313 EXPORT_SYMBOL_GPL(power_supply_get_by_name);
315 int power_supply_powers(struct power_supply *psy, struct device *dev)
317 return sysfs_create_link(&psy->dev->kobj, &dev->kobj, "powers");
319 EXPORT_SYMBOL_GPL(power_supply_powers);
321 static void power_supply_dev_release(struct device *dev)
323 pr_debug("device: '%s': %s\n", dev_name(dev), __func__);
327 #ifdef CONFIG_THERMAL
328 static int power_supply_read_temp(struct thermal_zone_device *tzd,
331 struct power_supply *psy;
332 union power_supply_propval val;
335 WARN_ON(tzd == NULL);
337 ret = psy->get_property(psy, POWER_SUPPLY_PROP_TEMP, &val);
339 /* Convert tenths of degree Celsius to milli degree Celsius. */
341 *temp = val.intval * 100;
346 static struct thermal_zone_device_ops psy_tzd_ops = {
347 .get_temp = power_supply_read_temp,
350 static int psy_register_thermal(struct power_supply *psy)
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) {
357 psy->tzd = thermal_zone_device_register(psy->name, 0, 0,
358 psy, &psy_tzd_ops, NULL, 0, 0);
359 if (IS_ERR(psy->tzd))
360 return PTR_ERR(psy->tzd);
367 static void psy_unregister_thermal(struct power_supply *psy)
369 if (IS_ERR_OR_NULL(psy->tzd))
371 thermal_zone_device_unregister(psy->tzd);
374 /* thermal cooling device callbacks */
375 static int ps_get_max_charge_cntl_limit(struct thermal_cooling_device *tcd,
376 unsigned long *state)
378 struct power_supply *psy;
379 union power_supply_propval val;
383 ret = psy->get_property(psy,
384 POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT_MAX, &val);
391 static int ps_get_cur_chrage_cntl_limit(struct thermal_cooling_device *tcd,
392 unsigned long *state)
394 struct power_supply *psy;
395 union power_supply_propval val;
399 ret = psy->get_property(psy,
400 POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT, &val);
407 static int ps_set_cur_charge_cntl_limit(struct thermal_cooling_device *tcd,
410 struct power_supply *psy;
411 union power_supply_propval val;
416 ret = psy->set_property(psy,
417 POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT, &val);
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,
428 static int psy_register_cooler(struct power_supply *psy)
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(
439 if (IS_ERR(psy->tcd))
440 return PTR_ERR(psy->tcd);
447 static void psy_unregister_cooler(struct power_supply *psy)
449 if (IS_ERR_OR_NULL(psy->tcd))
451 thermal_cooling_device_unregister(psy->tcd);
454 static int psy_register_thermal(struct power_supply *psy)
459 static void psy_unregister_thermal(struct power_supply *psy)
463 static int psy_register_cooler(struct power_supply *psy)
468 static void psy_unregister_cooler(struct power_supply *psy)
473 int power_supply_register(struct device *parent, struct power_supply *psy)
478 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
482 device_initialize(dev);
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);
491 INIT_WORK(&psy->changed_work, power_supply_changed_work);
493 rc = power_supply_check_supplies(psy);
495 dev_info(dev, "Not all required supplies found, defer probe\n");
496 goto check_supplies_failed;
499 rc = kobject_set_name(&dev->kobj, "%s", psy->name);
501 goto kobject_set_name_failed;
503 rc = device_add(dev);
505 goto device_add_failed;
507 rc = psy_register_thermal(psy);
509 goto register_thermal_failed;
511 rc = psy_register_cooler(psy);
513 goto register_cooler_failed;
515 rc = power_supply_create_triggers(psy);
517 goto create_triggers_failed;
519 power_supply_changed(psy);
523 create_triggers_failed:
524 psy_unregister_cooler(psy);
525 register_cooler_failed:
526 psy_unregister_thermal(psy);
527 register_thermal_failed:
529 kobject_set_name_failed:
531 check_supplies_failed:
536 EXPORT_SYMBOL_GPL(power_supply_register);
538 void power_supply_unregister(struct power_supply *psy)
540 cancel_work_sync(&psy->changed_work);
541 sysfs_remove_link(&psy->dev->kobj, "powers");
542 power_supply_remove_triggers(psy);
543 psy_unregister_cooler(psy);
544 psy_unregister_thermal(psy);
545 device_unregister(psy->dev);
547 EXPORT_SYMBOL_GPL(power_supply_unregister);
549 static int __init power_supply_class_init(void)
551 power_supply_class = class_create(THIS_MODULE, "power_supply");
553 if (IS_ERR(power_supply_class))
554 return PTR_ERR(power_supply_class);
556 power_supply_class->dev_uevent = power_supply_uevent;
557 power_supply_init_attrs(&power_supply_dev_type);
562 static void __exit power_supply_class_exit(void)
564 class_destroy(power_supply_class);
567 subsys_initcall(power_supply_class_init);
568 module_exit(power_supply_class_exit);
570 MODULE_DESCRIPTION("Universal power supply monitor class");
571 MODULE_AUTHOR("Ian Molton <spyro@f2s.com>, "
573 "Anton Vorontsov <cbou@mail.ru>");
574 MODULE_LICENSE("GPL");