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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>
16#include <linux/slab.h>
17#include <linux/device.h>
18#include <linux/notifier.h>
19#include <linux/err.h>
20#include <linux/power_supply.h>
21#include <linux/thermal.h>
22#include "power_supply.h"
23
24/* exported for the APM Power driver, APM emulation */
25struct class *power_supply_class;
26EXPORT_SYMBOL_GPL(power_supply_class);
27
28ATOMIC_NOTIFIER_HEAD(power_supply_notifier);
29EXPORT_SYMBOL_GPL(power_supply_notifier);
30
31static struct device_type power_supply_dev_type;
32
33static 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
59static int __power_supply_changed_work(struct device *dev, void *data)
60{
61 struct power_supply *psy = (struct power_supply *)data;
62 struct power_supply *pst = dev_get_drvdata(dev);
63
64 if (__power_supply_is_supplied_by(psy, pst)) {
65 if (pst->external_power_changed)
66 pst->external_power_changed(pst);
67 }
68
69 return 0;
70}
71
72static void power_supply_changed_work(struct work_struct *work)
73{
74 unsigned long flags;
75 struct power_supply *psy = container_of(work, struct power_supply,
76 changed_work);
77
78 dev_dbg(psy->dev, "%s\n", __func__);
79
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);
87 atomic_notifier_call_chain(&power_supply_notifier,
88 PSY_EVENT_PROP_CHANGED, psy);
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);
100}
101
102void power_supply_changed(struct power_supply *psy)
103{
104 unsigned long flags;
105
106 dev_dbg(psy->dev, "%s\n", __func__);
107
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);
112 schedule_work(&psy->changed_work);
113}
114EXPORT_SYMBOL_GPL(power_supply_changed);
115
116#ifdef CONFIG_OF
117#include <linux/of.h>
118
119static int __power_supply_populate_supplied_from(struct device *dev,
120 void *data)
121{
122 struct power_supply *psy = (struct power_supply *)data;
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)
130 continue;
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++;
137 of_node_put(np);
138 break;
139 }
140 of_node_put(np);
141 } while (np);
142
143 return 0;
144}
145
146static 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
158static int __power_supply_find_supply_from_node(struct device *dev,
159 void *data)
160{
161 struct device_node *np = (struct device_node *)data;
162 struct power_supply *epsy = dev_get_drvdata(dev);
163
164 /* return error breaks out of class_for_each_device loop */
165 if (epsy->of_node == np)
166 return -EINVAL;
167
168 return 0;
169}
170
171static 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 /*
189 * We have to treat the return value as inverted, because if
190 * we return error on not found, then it won't continue looking.
191 * So we trick it by returning error on success to stop looking
192 * once the matching device is found.
193 */
194 error = class_for_each_device(power_supply_class, NULL, supply_node,
195 __power_supply_find_supply_from_node);
196
197 return error ? 0 : -EPROBE_DEFER;
198}
199
200static int power_supply_check_supplies(struct power_supply *psy)
201{
202 struct device_node *np;
203 int cnt = 0;
204
205 /* If there is already a list honor it */
206 if (psy->supplied_from && psy->num_supplies > 0)
207 return 0;
208
209 /* No device node found, nothing to do */
210 if (!psy->of_node)
211 return 0;
212
213 do {
214 int ret;
215
216 np = of_parse_phandle(psy->of_node, "power-supplies", cnt++);
217 if (!np)
218 continue;
219
220 ret = power_supply_find_supply_from_node(np);
221 if (ret) {
222 dev_dbg(psy->dev, "Failed to find supply, defer!\n");
223 of_node_put(np);
224 return -EPROBE_DEFER;
225 }
226 of_node_put(np);
227 } while (np);
228
229 /* All supplies found, allocate char ** array for filling */
230 psy->supplied_from = devm_kzalloc(psy->dev, sizeof(psy->supplied_from),
231 GFP_KERNEL);
232 if (!psy->supplied_from) {
233 dev_err(psy->dev, "Couldn't allocate memory for supply list\n");
234 return -ENOMEM;
235 }
236
237 *psy->supplied_from = devm_kzalloc(psy->dev, sizeof(char *) * cnt,
238 GFP_KERNEL);
239 if (!*psy->supplied_from) {
240 dev_err(psy->dev, "Couldn't allocate memory for supply list\n");
241 return -ENOMEM;
242 }
243
244 return power_supply_populate_supplied_from(psy);
245}
246#else
247static inline int power_supply_check_supplies(struct power_supply *psy)
248{
249 return 0;
250}
251#endif
252
253static int __power_supply_am_i_supplied(struct device *dev, void *data)
254{
255 union power_supply_propval ret = {0,};
256 struct power_supply *psy = (struct power_supply *)data;
257 struct power_supply *epsy = dev_get_drvdata(dev);
258
259 if (__power_supply_is_supplied_by(epsy, psy))
260 if (!epsy->get_property(epsy, POWER_SUPPLY_PROP_ONLINE, &ret)) {
261 if (ret.intval)
262 return ret.intval;
263 }
264
265 return 0;
266}
267
268int power_supply_am_i_supplied(struct power_supply *psy)
269{
270 int error;
271
272 error = class_for_each_device(power_supply_class, NULL, psy,
273 __power_supply_am_i_supplied);
274
275 dev_dbg(psy->dev, "%s %d\n", __func__, error);
276
277 return error;
278}
279EXPORT_SYMBOL_GPL(power_supply_am_i_supplied);
280
281static int __power_supply_is_system_supplied(struct device *dev, void *data)
282{
283 union power_supply_propval ret = {0,};
284 struct power_supply *psy = dev_get_drvdata(dev);
285 unsigned int *count = data;
286
287 (*count)++;
288 if (psy->type != POWER_SUPPLY_TYPE_BATTERY) {
289 if (psy->get_property(psy, POWER_SUPPLY_PROP_ONLINE, &ret))
290 return 0;
291 if (ret.intval)
292 return ret.intval;
293 }
294 return 0;
295}
296
297int power_supply_is_system_supplied(void)
298{
299 int error;
300 unsigned int count = 0;
301
302 error = class_for_each_device(power_supply_class, NULL, &count,
303 __power_supply_is_system_supplied);
304
305 /*
306 * If no power class device was found at all, most probably we are
307 * running on a desktop system, so assume we are on mains power.
308 */
309 if (count == 0)
310 return 1;
311
312 return error;
313}
314EXPORT_SYMBOL_GPL(power_supply_is_system_supplied);
315
316int power_supply_set_battery_charged(struct power_supply *psy)
317{
318 if (psy->type == POWER_SUPPLY_TYPE_BATTERY && psy->set_charged) {
319 psy->set_charged(psy);
320 return 0;
321 }
322
323 return -EINVAL;
324}
325EXPORT_SYMBOL_GPL(power_supply_set_battery_charged);
326
327static int power_supply_match_device_by_name(struct device *dev, const void *data)
328{
329 const char *name = data;
330 struct power_supply *psy = dev_get_drvdata(dev);
331
332 return strcmp(psy->name, name) == 0;
333}
334
335struct power_supply *power_supply_get_by_name(const char *name)
336{
337 struct device *dev = class_find_device(power_supply_class, NULL, name,
338 power_supply_match_device_by_name);
339
340 return dev ? dev_get_drvdata(dev) : NULL;
341}
342EXPORT_SYMBOL_GPL(power_supply_get_by_name);
343
344#ifdef CONFIG_OF
345static int power_supply_match_device_node(struct device *dev, const void *data)
346{
347 return dev->parent && dev->parent->of_node == data;
348}
349
350struct power_supply *power_supply_get_by_phandle(struct device_node *np,
351 const char *property)
352{
353 struct device_node *power_supply_np;
354 struct device *dev;
355
356 power_supply_np = of_parse_phandle(np, property, 0);
357 if (!power_supply_np)
358 return ERR_PTR(-ENODEV);
359
360 dev = class_find_device(power_supply_class, NULL, power_supply_np,
361 power_supply_match_device_node);
362
363 of_node_put(power_supply_np);
364
365 return dev ? dev_get_drvdata(dev) : NULL;
366}
367EXPORT_SYMBOL_GPL(power_supply_get_by_phandle);
368#endif /* CONFIG_OF */
369
370int power_supply_powers(struct power_supply *psy, struct device *dev)
371{
372 return sysfs_create_link(&psy->dev->kobj, &dev->kobj, "powers");
373}
374EXPORT_SYMBOL_GPL(power_supply_powers);
375
376static void power_supply_dev_release(struct device *dev)
377{
378 pr_debug("device: '%s': %s\n", dev_name(dev), __func__);
379 kfree(dev);
380}
381
382int power_supply_reg_notifier(struct notifier_block *nb)
383{
384 return atomic_notifier_chain_register(&power_supply_notifier, nb);
385}
386EXPORT_SYMBOL_GPL(power_supply_reg_notifier);
387
388void power_supply_unreg_notifier(struct notifier_block *nb)
389{
390 atomic_notifier_chain_unregister(&power_supply_notifier, nb);
391}
392EXPORT_SYMBOL_GPL(power_supply_unreg_notifier);
393
394#ifdef CONFIG_THERMAL
395static int power_supply_read_temp(struct thermal_zone_device *tzd,
396 unsigned long *temp)
397{
398 struct power_supply *psy;
399 union power_supply_propval val;
400 int ret;
401
402 WARN_ON(tzd == NULL);
403 psy = tzd->devdata;
404 ret = psy->get_property(psy, POWER_SUPPLY_PROP_TEMP, &val);
405
406 /* Convert tenths of degree Celsius to milli degree Celsius. */
407 if (!ret)
408 *temp = val.intval * 100;
409
410 return ret;
411}
412
413static struct thermal_zone_device_ops psy_tzd_ops = {
414 .get_temp = power_supply_read_temp,
415};
416
417static int psy_register_thermal(struct power_supply *psy)
418{
419 int i;
420
421 /* Register battery zone device psy reports temperature */
422 for (i = 0; i < psy->num_properties; i++) {
423 if (psy->properties[i] == POWER_SUPPLY_PROP_TEMP) {
424 psy->tzd = thermal_zone_device_register(psy->name, 0, 0,
425 psy, &psy_tzd_ops, NULL, 0, 0);
426 if (IS_ERR(psy->tzd))
427 return PTR_ERR(psy->tzd);
428 break;
429 }
430 }
431 return 0;
432}
433
434static void psy_unregister_thermal(struct power_supply *psy)
435{
436 if (IS_ERR_OR_NULL(psy->tzd))
437 return;
438 thermal_zone_device_unregister(psy->tzd);
439}
440
441/* thermal cooling device callbacks */
442static int ps_get_max_charge_cntl_limit(struct thermal_cooling_device *tcd,
443 unsigned long *state)
444{
445 struct power_supply *psy;
446 union power_supply_propval val;
447 int ret;
448
449 psy = tcd->devdata;
450 ret = psy->get_property(psy,
451 POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT_MAX, &val);
452 if (!ret)
453 *state = val.intval;
454
455 return ret;
456}
457
458static int ps_get_cur_chrage_cntl_limit(struct thermal_cooling_device *tcd,
459 unsigned long *state)
460{
461 struct power_supply *psy;
462 union power_supply_propval val;
463 int ret;
464
465 psy = tcd->devdata;
466 ret = psy->get_property(psy,
467 POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT, &val);
468 if (!ret)
469 *state = val.intval;
470
471 return ret;
472}
473
474static int ps_set_cur_charge_cntl_limit(struct thermal_cooling_device *tcd,
475 unsigned long state)
476{
477 struct power_supply *psy;
478 union power_supply_propval val;
479 int ret;
480
481 psy = tcd->devdata;
482 val.intval = state;
483 ret = psy->set_property(psy,
484 POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT, &val);
485
486 return ret;
487}
488
489static struct thermal_cooling_device_ops psy_tcd_ops = {
490 .get_max_state = ps_get_max_charge_cntl_limit,
491 .get_cur_state = ps_get_cur_chrage_cntl_limit,
492 .set_cur_state = ps_set_cur_charge_cntl_limit,
493};
494
495static int psy_register_cooler(struct power_supply *psy)
496{
497 int i;
498
499 /* Register for cooling device if psy can control charging */
500 for (i = 0; i < psy->num_properties; i++) {
501 if (psy->properties[i] ==
502 POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT) {
503 psy->tcd = thermal_cooling_device_register(
504 (char *)psy->name,
505 psy, &psy_tcd_ops);
506 if (IS_ERR(psy->tcd))
507 return PTR_ERR(psy->tcd);
508 break;
509 }
510 }
511 return 0;
512}
513
514static void psy_unregister_cooler(struct power_supply *psy)
515{
516 if (IS_ERR_OR_NULL(psy->tcd))
517 return;
518 thermal_cooling_device_unregister(psy->tcd);
519}
520#else
521static int psy_register_thermal(struct power_supply *psy)
522{
523 return 0;
524}
525
526static void psy_unregister_thermal(struct power_supply *psy)
527{
528}
529
530static int psy_register_cooler(struct power_supply *psy)
531{
532 return 0;
533}
534
535static void psy_unregister_cooler(struct power_supply *psy)
536{
537}
538#endif
539
540int power_supply_register(struct device *parent, struct power_supply *psy)
541{
542 struct device *dev;
543 int rc;
544
545 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
546 if (!dev)
547 return -ENOMEM;
548
549 device_initialize(dev);
550
551 dev->class = power_supply_class;
552 dev->type = &power_supply_dev_type;
553 dev->parent = parent;
554 dev->release = power_supply_dev_release;
555 dev_set_drvdata(dev, psy);
556 psy->dev = dev;
557
558 rc = dev_set_name(dev, "%s", psy->name);
559 if (rc)
560 goto dev_set_name_failed;
561
562 INIT_WORK(&psy->changed_work, power_supply_changed_work);
563
564 rc = power_supply_check_supplies(psy);
565 if (rc) {
566 dev_info(dev, "Not all required supplies found, defer probe\n");
567 goto check_supplies_failed;
568 }
569
570 spin_lock_init(&psy->changed_lock);
571 rc = device_init_wakeup(dev, true);
572 if (rc)
573 goto wakeup_init_failed;
574
575 rc = device_add(dev);
576 if (rc)
577 goto device_add_failed;
578
579 rc = psy_register_thermal(psy);
580 if (rc)
581 goto register_thermal_failed;
582
583 rc = psy_register_cooler(psy);
584 if (rc)
585 goto register_cooler_failed;
586
587 rc = power_supply_create_triggers(psy);
588 if (rc)
589 goto create_triggers_failed;
590
591 power_supply_changed(psy);
592
593 goto success;
594
595create_triggers_failed:
596 psy_unregister_cooler(psy);
597register_cooler_failed:
598 psy_unregister_thermal(psy);
599register_thermal_failed:
600 device_del(dev);
601device_add_failed:
602wakeup_init_failed:
603check_supplies_failed:
604dev_set_name_failed:
605 put_device(dev);
606success:
607 return rc;
608}
609EXPORT_SYMBOL_GPL(power_supply_register);
610
611void power_supply_unregister(struct power_supply *psy)
612{
613 cancel_work_sync(&psy->changed_work);
614 sysfs_remove_link(&psy->dev->kobj, "powers");
615 power_supply_remove_triggers(psy);
616 psy_unregister_cooler(psy);
617 psy_unregister_thermal(psy);
618 device_init_wakeup(psy->dev, false);
619 device_unregister(psy->dev);
620}
621EXPORT_SYMBOL_GPL(power_supply_unregister);
622
623static int __init power_supply_class_init(void)
624{
625 power_supply_class = class_create(THIS_MODULE, "power_supply");
626
627 if (IS_ERR(power_supply_class))
628 return PTR_ERR(power_supply_class);
629
630 power_supply_class->dev_uevent = power_supply_uevent;
631 power_supply_init_attrs(&power_supply_dev_type);
632
633 return 0;
634}
635
636static void __exit power_supply_class_exit(void)
637{
638 class_destroy(power_supply_class);
639}
640
641subsys_initcall(power_supply_class_init);
642module_exit(power_supply_class_exit);
643
644MODULE_DESCRIPTION("Universal power supply monitor class");
645MODULE_AUTHOR("Ian Molton <spyro@f2s.com>, "
646 "Szabolcs Gyurko, "
647 "Anton Vorontsov <cbou@mail.ru>");
648MODULE_LICENSE("GPL");