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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"
22
23
24struct class *power_supply_class;
25EXPORT_SYMBOL_GPL(power_supply_class);
26
27static struct device_type power_supply_dev_type;
28
29static 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
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
55static 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);
59
60 if (__power_supply_is_supplied_by(psy, pst)) {
61 if (pst->external_power_changed)
62 pst->external_power_changed(pst);
63 }
64
65 return 0;
66}
67
68static void power_supply_changed_work(struct work_struct *work)
69{
70 unsigned long flags;
71 struct power_supply *psy = container_of(work, struct power_supply,
72 changed_work);
73
74 dev_dbg(psy->dev, "%s\n", __func__);
75
76 spin_lock_irqsave(&psy->changed_lock, flags);
77 if (psy->changed) {
78 psy->changed = false;
79 spin_unlock_irqrestore(&psy->changed_lock, flags);
80 class_for_each_device(power_supply_class, NULL, psy,
81 __power_supply_changed_work);
82 power_supply_update_leds(psy);
83 kobject_uevent(&psy->dev->kobj, KOBJ_CHANGE);
84 spin_lock_irqsave(&psy->changed_lock, flags);
85 }
86
87
88
89
90
91 if (!psy->changed)
92 pm_relax(psy->dev);
93 spin_unlock_irqrestore(&psy->changed_lock, flags);
94}
95
96void power_supply_changed(struct power_supply *psy)
97{
98 unsigned long flags;
99
100 dev_dbg(psy->dev, "%s\n", __func__);
101
102 spin_lock_irqsave(&psy->changed_lock, flags);
103 psy->changed = true;
104 pm_stay_awake(psy->dev);
105 spin_unlock_irqrestore(&psy->changed_lock, flags);
106 schedule_work(&psy->changed_work);
107}
108EXPORT_SYMBOL_GPL(power_supply_changed);
109
110#ifdef CONFIG_OF
111#include <linux/of.h>
112
113static int __power_supply_populate_supplied_from(struct device *dev,
114 void *data)
115{
116 struct power_supply *psy = (struct power_supply *)data;
117 struct power_supply *epsy = dev_get_drvdata(dev);
118 struct device_node *np;
119 int i = 0;
120
121 do {
122 np = of_parse_phandle(psy->of_node, "power-supplies", i++);
123 if (!np)
124 continue;
125
126 if (np == epsy->of_node) {
127 dev_info(psy->dev, "%s: Found supply : %s\n",
128 psy->name, epsy->name);
129 psy->supplied_from[i-1] = (char *)epsy->name;
130 psy->num_supplies++;
131 break;
132 }
133 } while (np);
134
135 return 0;
136}
137
138static int power_supply_populate_supplied_from(struct power_supply *psy)
139{
140 int error;
141
142 error = class_for_each_device(power_supply_class, NULL, psy,
143 __power_supply_populate_supplied_from);
144
145 dev_dbg(psy->dev, "%s %d\n", __func__, error);
146
147 return error;
148}
149
150static int __power_supply_find_supply_from_node(struct device *dev,
151 void *data)
152{
153 struct device_node *np = (struct device_node *)data;
154 struct power_supply *epsy = dev_get_drvdata(dev);
155
156
157 if (epsy->of_node == np)
158 return -EINVAL;
159
160 return 0;
161}
162
163static int power_supply_find_supply_from_node(struct device_node *supply_node)
164{
165 int error;
166 struct device *dev;
167 struct class_dev_iter iter;
168
169
170
171
172
173
174 class_dev_iter_init(&iter, power_supply_class, NULL, NULL);
175 dev = class_dev_iter_next(&iter);
176
177 if (!dev)
178 return -EPROBE_DEFER;
179
180
181
182
183
184
185
186 error = class_for_each_device(power_supply_class, NULL, supply_node,
187 __power_supply_find_supply_from_node);
188
189 return error ? 0 : -EPROBE_DEFER;
190}
191
192static int power_supply_check_supplies(struct power_supply *psy)
193{
194 struct device_node *np;
195 int cnt = 0;
196
197
198 if (psy->supplied_from && psy->num_supplies > 0)
199 return 0;
200
201
202 if (!psy->of_node)
203 return 0;
204
205 do {
206 int ret;
207
208 np = of_parse_phandle(psy->of_node, "power-supplies", cnt++);
209 if (!np)
210 continue;
211
212 ret = power_supply_find_supply_from_node(np);
213 if (ret) {
214 dev_dbg(psy->dev, "Failed to find supply, defer!\n");
215 return -EPROBE_DEFER;
216 }
217 } while (np);
218
219
220 psy->supplied_from = devm_kzalloc(psy->dev, sizeof(psy->supplied_from),
221 GFP_KERNEL);
222 if (!psy->supplied_from) {
223 dev_err(psy->dev, "Couldn't allocate memory for supply list\n");
224 return -ENOMEM;
225 }
226
227 *psy->supplied_from = devm_kzalloc(psy->dev, sizeof(char *) * cnt,
228 GFP_KERNEL);
229 if (!*psy->supplied_from) {
230 dev_err(psy->dev, "Couldn't allocate memory for supply list\n");
231 return -ENOMEM;
232 }
233
234 return power_supply_populate_supplied_from(psy);
235}
236#else
237static inline int power_supply_check_supplies(struct power_supply *psy)
238{
239 return 0;
240}
241#endif
242
243static int __power_supply_am_i_supplied(struct device *dev, void *data)
244{
245 union power_supply_propval ret = {0,};
246 struct power_supply *psy = (struct power_supply *)data;
247 struct power_supply *epsy = dev_get_drvdata(dev);
248
249 if (__power_supply_is_supplied_by(epsy, psy))
250 if (!epsy->get_property(epsy, POWER_SUPPLY_PROP_ONLINE, &ret)) {
251 if (ret.intval)
252 return ret.intval;
253 }
254
255 return 0;
256}
257
258int power_supply_am_i_supplied(struct power_supply *psy)
259{
260 int error;
261
262 error = class_for_each_device(power_supply_class, NULL, psy,
263 __power_supply_am_i_supplied);
264
265 dev_dbg(psy->dev, "%s %d\n", __func__, error);
266
267 return error;
268}
269EXPORT_SYMBOL_GPL(power_supply_am_i_supplied);
270
271static int __power_supply_is_system_supplied(struct device *dev, void *data)
272{
273 union power_supply_propval ret = {0,};
274 struct power_supply *psy = dev_get_drvdata(dev);
275 unsigned int *count = data;
276
277 (*count)++;
278 if (psy->type != POWER_SUPPLY_TYPE_BATTERY) {
279 if (psy->get_property(psy, POWER_SUPPLY_PROP_ONLINE, &ret))
280 return 0;
281 if (ret.intval)
282 return ret.intval;
283 }
284 return 0;
285}
286
287int power_supply_is_system_supplied(void)
288{
289 int error;
290 unsigned int count = 0;
291
292 error = class_for_each_device(power_supply_class, NULL, &count,
293 __power_supply_is_system_supplied);
294
295
296
297
298
299 if (count == 0)
300 return 1;
301
302 return error;
303}
304EXPORT_SYMBOL_GPL(power_supply_is_system_supplied);
305
306int power_supply_set_battery_charged(struct power_supply *psy)
307{
308 if (psy->type == POWER_SUPPLY_TYPE_BATTERY && psy->set_charged) {
309 psy->set_charged(psy);
310 return 0;
311 }
312
313 return -EINVAL;
314}
315EXPORT_SYMBOL_GPL(power_supply_set_battery_charged);
316
317static int power_supply_match_device_by_name(struct device *dev, const void *data)
318{
319 const char *name = data;
320 struct power_supply *psy = dev_get_drvdata(dev);
321
322 return strcmp(psy->name, name) == 0;
323}
324
325struct power_supply *power_supply_get_by_name(const char *name)
326{
327 struct device *dev = class_find_device(power_supply_class, NULL, name,
328 power_supply_match_device_by_name);
329
330 return dev ? dev_get_drvdata(dev) : NULL;
331}
332EXPORT_SYMBOL_GPL(power_supply_get_by_name);
333
334int power_supply_powers(struct power_supply *psy, struct device *dev)
335{
336 return sysfs_create_link(&psy->dev->kobj, &dev->kobj, "powers");
337}
338EXPORT_SYMBOL_GPL(power_supply_powers);
339
340static void power_supply_dev_release(struct device *dev)
341{
342 pr_debug("device: '%s': %s\n", dev_name(dev), __func__);
343 kfree(dev);
344}
345
346#ifdef CONFIG_THERMAL
347static int power_supply_read_temp(struct thermal_zone_device *tzd,
348 unsigned long *temp)
349{
350 struct power_supply *psy;
351 union power_supply_propval val;
352 int ret;
353
354 WARN_ON(tzd == NULL);
355 psy = tzd->devdata;
356 ret = psy->get_property(psy, POWER_SUPPLY_PROP_TEMP, &val);
357
358
359 if (!ret)
360 *temp = val.intval * 100;
361
362 return ret;
363}
364
365static struct thermal_zone_device_ops psy_tzd_ops = {
366 .get_temp = power_supply_read_temp,
367};
368
369static int psy_register_thermal(struct power_supply *psy)
370{
371 int i;
372
373
374 for (i = 0; i < psy->num_properties; i++) {
375 if (psy->properties[i] == POWER_SUPPLY_PROP_TEMP) {
376 psy->tzd = thermal_zone_device_register(psy->name, 0, 0,
377 psy, &psy_tzd_ops, NULL, 0, 0);
378 if (IS_ERR(psy->tzd))
379 return PTR_ERR(psy->tzd);
380 break;
381 }
382 }
383 return 0;
384}
385
386static void psy_unregister_thermal(struct power_supply *psy)
387{
388 if (IS_ERR_OR_NULL(psy->tzd))
389 return;
390 thermal_zone_device_unregister(psy->tzd);
391}
392
393
394static int ps_get_max_charge_cntl_limit(struct thermal_cooling_device *tcd,
395 unsigned long *state)
396{
397 struct power_supply *psy;
398 union power_supply_propval val;
399 int ret;
400
401 psy = tcd->devdata;
402 ret = psy->get_property(psy,
403 POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT_MAX, &val);
404 if (!ret)
405 *state = val.intval;
406
407 return ret;
408}
409
410static int ps_get_cur_chrage_cntl_limit(struct thermal_cooling_device *tcd,
411 unsigned long *state)
412{
413 struct power_supply *psy;
414 union power_supply_propval val;
415 int ret;
416
417 psy = tcd->devdata;
418 ret = psy->get_property(psy,
419 POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT, &val);
420 if (!ret)
421 *state = val.intval;
422
423 return ret;
424}
425
426static int ps_set_cur_charge_cntl_limit(struct thermal_cooling_device *tcd,
427 unsigned long state)
428{
429 struct power_supply *psy;
430 union power_supply_propval val;
431 int ret;
432
433 psy = tcd->devdata;
434 val.intval = state;
435 ret = psy->set_property(psy,
436 POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT, &val);
437
438 return ret;
439}
440
441static struct thermal_cooling_device_ops psy_tcd_ops = {
442 .get_max_state = ps_get_max_charge_cntl_limit,
443 .get_cur_state = ps_get_cur_chrage_cntl_limit,
444 .set_cur_state = ps_set_cur_charge_cntl_limit,
445};
446
447static int psy_register_cooler(struct power_supply *psy)
448{
449 int i;
450
451
452 for (i = 0; i < psy->num_properties; i++) {
453 if (psy->properties[i] ==
454 POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT) {
455 psy->tcd = thermal_cooling_device_register(
456 (char *)psy->name,
457 psy, &psy_tcd_ops);
458 if (IS_ERR(psy->tcd))
459 return PTR_ERR(psy->tcd);
460 break;
461 }
462 }
463 return 0;
464}
465
466static void psy_unregister_cooler(struct power_supply *psy)
467{
468 if (IS_ERR_OR_NULL(psy->tcd))
469 return;
470 thermal_cooling_device_unregister(psy->tcd);
471}
472#else
473static int psy_register_thermal(struct power_supply *psy)
474{
475 return 0;
476}
477
478static void psy_unregister_thermal(struct power_supply *psy)
479{
480}
481
482static int psy_register_cooler(struct power_supply *psy)
483{
484 return 0;
485}
486
487static void psy_unregister_cooler(struct power_supply *psy)
488{
489}
490#endif
491
492int __power_supply_register(struct device *parent, struct power_supply *psy, bool ws)
493{
494 struct device *dev;
495 int rc;
496
497 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
498 if (!dev)
499 return -ENOMEM;
500
501 device_initialize(dev);
502
503 dev->class = power_supply_class;
504 dev->type = &power_supply_dev_type;
505 dev->parent = parent;
506 dev->release = power_supply_dev_release;
507 dev_set_drvdata(dev, psy);
508 psy->dev = dev;
509
510 INIT_WORK(&psy->changed_work, power_supply_changed_work);
511
512 rc = power_supply_check_supplies(psy);
513 if (rc) {
514 dev_info(dev, "Not all required supplies found, defer probe\n");
515 goto check_supplies_failed;
516 }
517
518 spin_lock_init(&psy->changed_lock);
519 rc = device_init_wakeup(dev, ws);
520 if (rc)
521 goto wakeup_init_failed;
522
523 rc = kobject_set_name(&dev->kobj, "%s", psy->name);
524 if (rc)
525 goto kobject_set_name_failed;
526
527 rc = device_add(dev);
528 if (rc)
529 goto device_add_failed;
530
531 rc = psy_register_thermal(psy);
532 if (rc)
533 goto register_thermal_failed;
534
535 rc = psy_register_cooler(psy);
536 if (rc)
537 goto register_cooler_failed;
538
539 rc = power_supply_create_triggers(psy);
540 if (rc)
541 goto create_triggers_failed;
542
543 power_supply_changed(psy);
544
545 goto success;
546
547create_triggers_failed:
548 psy_unregister_cooler(psy);
549register_cooler_failed:
550 psy_unregister_thermal(psy);
551register_thermal_failed:
552wakeup_init_failed:
553 device_del(dev);
554kobject_set_name_failed:
555device_add_failed:
556check_supplies_failed:
557 put_device(dev);
558success:
559 return rc;
560}
561
562int power_supply_register(struct device *parent, struct power_supply *psy)
563{
564 return __power_supply_register(parent, psy, true);
565}
566EXPORT_SYMBOL_GPL(power_supply_register);
567
568int power_supply_register_no_ws(struct device *parent, struct power_supply *psy)
569{
570 return __power_supply_register(parent, psy, false);
571}
572EXPORT_SYMBOL_GPL(power_supply_register_no_ws);
573
574static void devm_power_supply_release(struct device *dev, void *res)
575{
576 struct power_supply **psy = res;
577
578 power_supply_unregister(*psy);
579}
580
581int devm_power_supply_register(struct device *parent, struct power_supply *psy)
582{
583 struct power_supply **ptr = devres_alloc(devm_power_supply_release,
584 sizeof(*ptr), GFP_KERNEL);
585 int ret;
586
587 if (!ptr)
588 return -ENOMEM;
589 ret = __power_supply_register(parent, psy, true);
590 if (ret < 0)
591 devres_free(ptr);
592 else {
593 *ptr = psy;
594 devres_add(parent, ptr);
595 }
596 return ret;
597}
598EXPORT_SYMBOL_GPL(devm_power_supply_register);
599
600int devm_power_supply_register_no_ws(struct device *parent, struct power_supply *psy)
601{
602 struct power_supply **ptr = devres_alloc(devm_power_supply_release,
603 sizeof(*ptr), GFP_KERNEL);
604 int ret;
605
606 if (!ptr)
607 return -ENOMEM;
608 ret = __power_supply_register(parent, psy, false);
609 if (ret < 0)
610 devres_free(ptr);
611 else {
612 *ptr = psy;
613 devres_add(parent, ptr);
614 }
615 return ret;
616}
617EXPORT_SYMBOL_GPL(devm_power_supply_register_no_ws);
618
619void power_supply_unregister(struct power_supply *psy)
620{
621 cancel_work_sync(&psy->changed_work);
622 sysfs_remove_link(&psy->dev->kobj, "powers");
623 power_supply_remove_triggers(psy);
624 psy_unregister_cooler(psy);
625 psy_unregister_thermal(psy);
626 device_init_wakeup(psy->dev, false);
627 device_unregister(psy->dev);
628}
629EXPORT_SYMBOL_GPL(power_supply_unregister);
630
631static int __init power_supply_class_init(void)
632{
633 power_supply_class = class_create(THIS_MODULE, "power_supply");
634
635 if (IS_ERR(power_supply_class))
636 return PTR_ERR(power_supply_class);
637
638 power_supply_class->dev_uevent = power_supply_uevent;
639 power_supply_init_attrs(&power_supply_dev_type);
640
641 return 0;
642}
643
644static void __exit power_supply_class_exit(void)
645{
646 class_destroy(power_supply_class);
647}
648
649subsys_initcall(power_supply_class_init);
650module_exit(power_supply_class_exit);
651
652MODULE_DESCRIPTION("Universal power supply monitor class");
653MODULE_AUTHOR("Ian Molton <spyro@f2s.com>, "
654 "Szabolcs Gyurko, "
655 "Anton Vorontsov <cbou@mail.ru>");
656MODULE_LICENSE("GPL");
657
