1
2
3
4
5
6
7
8
9
10
11
12#include <linux/module.h>
13#include <linux/types.h>
14#include <linux/init.h>
15#include <linux/slab.h>
16#include <linux/delay.h>
17#include <linux/device.h>
18#include <linux/notifier.h>
19#include <linux/err.h>
20#include <linux/of.h>
21#include <linux/power_supply.h>
22#include <linux/property.h>
23#include <linux/thermal.h>
24#include "power_supply.h"
25
26
27struct class *power_supply_class;
28EXPORT_SYMBOL_GPL(power_supply_class);
29
30ATOMIC_NOTIFIER_HEAD(power_supply_notifier);
31EXPORT_SYMBOL_GPL(power_supply_notifier);
32
33static struct device_type power_supply_dev_type;
34
35#define POWER_SUPPLY_DEFERRED_REGISTER_TIME msecs_to_jiffies(10)
36
37static bool __power_supply_is_supplied_by(struct power_supply *supplier,
38 struct power_supply *supply)
39{
40 int i;
41
42 if (!supply->supplied_from && !supplier->supplied_to)
43 return false;
44
45
46 if (supply->supplied_from) {
47 if (!supplier->desc->name)
48 return false;
49 for (i = 0; i < supply->num_supplies; i++)
50 if (!strcmp(supplier->desc->name, supply->supplied_from[i]))
51 return true;
52 } else {
53 if (!supply->desc->name)
54 return false;
55 for (i = 0; i < supplier->num_supplicants; i++)
56 if (!strcmp(supplier->supplied_to[i], supply->desc->name))
57 return true;
58 }
59
60 return false;
61}
62
63static int __power_supply_changed_work(struct device *dev, void *data)
64{
65 struct power_supply *psy = data;
66 struct power_supply *pst = dev_get_drvdata(dev);
67
68 if (__power_supply_is_supplied_by(psy, pst)) {
69 if (pst->desc->external_power_changed)
70 pst->desc->external_power_changed(pst);
71 }
72
73 return 0;
74}
75
76static void power_supply_changed_work(struct work_struct *work)
77{
78 unsigned long flags;
79 struct power_supply *psy = container_of(work, struct power_supply,
80 changed_work);
81
82 dev_dbg(&psy->dev, "%s\n", __func__);
83
84 spin_lock_irqsave(&psy->changed_lock, flags);
85
86
87
88
89
90
91
92 if (likely(psy->changed)) {
93 psy->changed = false;
94 spin_unlock_irqrestore(&psy->changed_lock, flags);
95 class_for_each_device(power_supply_class, NULL, psy,
96 __power_supply_changed_work);
97 power_supply_update_leds(psy);
98 atomic_notifier_call_chain(&power_supply_notifier,
99 PSY_EVENT_PROP_CHANGED, psy);
100 kobject_uevent(&psy->dev.kobj, KOBJ_CHANGE);
101 spin_lock_irqsave(&psy->changed_lock, flags);
102 }
103
104
105
106
107
108
109 if (likely(!psy->changed))
110 pm_relax(&psy->dev);
111 spin_unlock_irqrestore(&psy->changed_lock, flags);
112}
113
114void power_supply_changed(struct power_supply *psy)
115{
116 unsigned long flags;
117
118 dev_dbg(&psy->dev, "%s\n", __func__);
119
120 spin_lock_irqsave(&psy->changed_lock, flags);
121 psy->changed = true;
122 pm_stay_awake(&psy->dev);
123 spin_unlock_irqrestore(&psy->changed_lock, flags);
124 schedule_work(&psy->changed_work);
125}
126EXPORT_SYMBOL_GPL(power_supply_changed);
127
128
129
130
131
132
133
134
135
136
137
138static void power_supply_deferred_register_work(struct work_struct *work)
139{
140 struct power_supply *psy = container_of(work, struct power_supply,
141 deferred_register_work.work);
142
143 if (psy->dev.parent) {
144 while (!mutex_trylock(&psy->dev.parent->mutex)) {
145 if (psy->removing)
146 return;
147 msleep(10);
148 }
149 }
150
151 power_supply_changed(psy);
152
153 if (psy->dev.parent)
154 mutex_unlock(&psy->dev.parent->mutex);
155}
156
157#ifdef CONFIG_OF
158static int __power_supply_populate_supplied_from(struct device *dev,
159 void *data)
160{
161 struct power_supply *psy = data;
162 struct power_supply *epsy = dev_get_drvdata(dev);
163 struct device_node *np;
164 int i = 0;
165
166 do {
167 np = of_parse_phandle(psy->of_node, "power-supplies", i++);
168 if (!np)
169 break;
170
171 if (np == epsy->of_node) {
172 dev_info(&psy->dev, "%s: Found supply : %s\n",
173 psy->desc->name, epsy->desc->name);
174 psy->supplied_from[i-1] = (char *)epsy->desc->name;
175 psy->num_supplies++;
176 of_node_put(np);
177 break;
178 }
179 of_node_put(np);
180 } while (np);
181
182 return 0;
183}
184
185static int power_supply_populate_supplied_from(struct power_supply *psy)
186{
187 int error;
188
189 error = class_for_each_device(power_supply_class, NULL, psy,
190 __power_supply_populate_supplied_from);
191
192 dev_dbg(&psy->dev, "%s %d\n", __func__, error);
193
194 return error;
195}
196
197static int __power_supply_find_supply_from_node(struct device *dev,
198 void *data)
199{
200 struct device_node *np = data;
201 struct power_supply *epsy = dev_get_drvdata(dev);
202
203
204 if (epsy->of_node == np)
205 return 1;
206
207 return 0;
208}
209
210static int power_supply_find_supply_from_node(struct device_node *supply_node)
211{
212 int error;
213
214
215
216
217
218
219
220
221
222
223
224 error = class_for_each_device(power_supply_class, NULL, supply_node,
225 __power_supply_find_supply_from_node);
226
227 return error ? (error == 1 ? 0 : error) : -EPROBE_DEFER;
228}
229
230static int power_supply_check_supplies(struct power_supply *psy)
231{
232 struct device_node *np;
233 int cnt = 0;
234
235
236 if (psy->supplied_from && psy->num_supplies > 0)
237 return 0;
238
239
240 if (!psy->of_node)
241 return 0;
242
243 do {
244 int ret;
245
246 np = of_parse_phandle(psy->of_node, "power-supplies", cnt++);
247 if (!np)
248 break;
249
250 ret = power_supply_find_supply_from_node(np);
251 of_node_put(np);
252
253 if (ret) {
254 dev_dbg(&psy->dev, "Failed to find supply!\n");
255 return ret;
256 }
257 } while (np);
258
259
260 if (cnt == 1)
261 return 0;
262
263
264 psy->supplied_from = devm_kzalloc(&psy->dev, sizeof(psy->supplied_from),
265 GFP_KERNEL);
266 if (!psy->supplied_from)
267 return -ENOMEM;
268
269 *psy->supplied_from = devm_kcalloc(&psy->dev,
270 cnt - 1, sizeof(char *),
271 GFP_KERNEL);
272 if (!*psy->supplied_from)
273 return -ENOMEM;
274
275 return power_supply_populate_supplied_from(psy);
276}
277#else
278static int power_supply_check_supplies(struct power_supply *psy)
279{
280 int nval, ret;
281
282 if (!psy->dev.parent)
283 return 0;
284
285 nval = device_property_read_string_array(psy->dev.parent,
286 "supplied-from", NULL, 0);
287 if (nval <= 0)
288 return 0;
289
290 psy->supplied_from = devm_kmalloc_array(&psy->dev, nval,
291 sizeof(char *), GFP_KERNEL);
292 if (!psy->supplied_from)
293 return -ENOMEM;
294
295 ret = device_property_read_string_array(psy->dev.parent,
296 "supplied-from", (const char **)psy->supplied_from, nval);
297 if (ret < 0)
298 return ret;
299
300 psy->num_supplies = nval;
301
302 return 0;
303}
304#endif
305
306struct psy_am_i_supplied_data {
307 struct power_supply *psy;
308 unsigned int count;
309};
310
311static int __power_supply_am_i_supplied(struct device *dev, void *_data)
312{
313 union power_supply_propval ret = {0,};
314 struct power_supply *epsy = dev_get_drvdata(dev);
315 struct psy_am_i_supplied_data *data = _data;
316
317 if (__power_supply_is_supplied_by(epsy, data->psy)) {
318 data->count++;
319 if (!epsy->desc->get_property(epsy, POWER_SUPPLY_PROP_ONLINE,
320 &ret))
321 return ret.intval;
322 }
323
324 return 0;
325}
326
327int power_supply_am_i_supplied(struct power_supply *psy)
328{
329 struct psy_am_i_supplied_data data = { psy, 0 };
330 int error;
331
332 error = class_for_each_device(power_supply_class, NULL, &data,
333 __power_supply_am_i_supplied);
334
335 dev_dbg(&psy->dev, "%s count %u err %d\n", __func__, data.count, error);
336
337 if (data.count == 0)
338 return -ENODEV;
339
340 return error;
341}
342EXPORT_SYMBOL_GPL(power_supply_am_i_supplied);
343
344static int __power_supply_is_system_supplied(struct device *dev, void *data)
345{
346 union power_supply_propval ret = {0,};
347 struct power_supply *psy = dev_get_drvdata(dev);
348 unsigned int *count = data;
349
350 (*count)++;
351 if (psy->desc->type != POWER_SUPPLY_TYPE_BATTERY)
352 if (!psy->desc->get_property(psy, POWER_SUPPLY_PROP_ONLINE,
353 &ret))
354 return ret.intval;
355
356 return 0;
357}
358
359int power_supply_is_system_supplied(void)
360{
361 int error;
362 unsigned int count = 0;
363
364 error = class_for_each_device(power_supply_class, NULL, &count,
365 __power_supply_is_system_supplied);
366
367
368
369
370
371 if (count == 0)
372 return 1;
373
374 return error;
375}
376EXPORT_SYMBOL_GPL(power_supply_is_system_supplied);
377
378static int __power_supply_get_supplier_max_current(struct device *dev,
379 void *data)
380{
381 union power_supply_propval ret = {0,};
382 struct power_supply *epsy = dev_get_drvdata(dev);
383 struct power_supply *psy = data;
384
385 if (__power_supply_is_supplied_by(epsy, psy))
386 if (!epsy->desc->get_property(epsy,
387 POWER_SUPPLY_PROP_CURRENT_MAX,
388 &ret))
389 return ret.intval;
390
391 return 0;
392}
393
394int power_supply_set_input_current_limit_from_supplier(struct power_supply *psy)
395{
396 union power_supply_propval val = {0,};
397 int curr;
398
399 if (!psy->desc->set_property)
400 return -EINVAL;
401
402
403
404
405
406
407 curr = class_for_each_device(power_supply_class, NULL, psy,
408 __power_supply_get_supplier_max_current);
409 if (curr <= 0)
410 return (curr == 0) ? -ENODEV : curr;
411
412 val.intval = curr;
413
414 return psy->desc->set_property(psy,
415 POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT, &val);
416}
417EXPORT_SYMBOL_GPL(power_supply_set_input_current_limit_from_supplier);
418
419int power_supply_set_battery_charged(struct power_supply *psy)
420{
421 if (atomic_read(&psy->use_cnt) >= 0 &&
422 psy->desc->type == POWER_SUPPLY_TYPE_BATTERY &&
423 psy->desc->set_charged) {
424 psy->desc->set_charged(psy);
425 return 0;
426 }
427
428 return -EINVAL;
429}
430EXPORT_SYMBOL_GPL(power_supply_set_battery_charged);
431
432static int power_supply_match_device_by_name(struct device *dev, const void *data)
433{
434 const char *name = data;
435 struct power_supply *psy = dev_get_drvdata(dev);
436
437 return strcmp(psy->desc->name, name) == 0;
438}
439
440
441
442
443
444
445
446
447
448
449
450
451struct power_supply *power_supply_get_by_name(const char *name)
452{
453 struct power_supply *psy = NULL;
454 struct device *dev = class_find_device(power_supply_class, NULL, name,
455 power_supply_match_device_by_name);
456
457 if (dev) {
458 psy = dev_get_drvdata(dev);
459 atomic_inc(&psy->use_cnt);
460 }
461
462 return psy;
463}
464EXPORT_SYMBOL_GPL(power_supply_get_by_name);
465
466
467
468
469
470
471
472
473void power_supply_put(struct power_supply *psy)
474{
475 might_sleep();
476
477 atomic_dec(&psy->use_cnt);
478 put_device(&psy->dev);
479}
480EXPORT_SYMBOL_GPL(power_supply_put);
481
482#ifdef CONFIG_OF
483static int power_supply_match_device_node(struct device *dev, const void *data)
484{
485 return dev->parent && dev->parent->of_node == data;
486}
487
488
489
490
491
492
493
494
495
496
497
498
499
500struct power_supply *power_supply_get_by_phandle(struct device_node *np,
501 const char *property)
502{
503 struct device_node *power_supply_np;
504 struct power_supply *psy = NULL;
505 struct device *dev;
506
507 power_supply_np = of_parse_phandle(np, property, 0);
508 if (!power_supply_np)
509 return ERR_PTR(-ENODEV);
510
511 dev = class_find_device(power_supply_class, NULL, power_supply_np,
512 power_supply_match_device_node);
513
514 of_node_put(power_supply_np);
515
516 if (dev) {
517 psy = dev_get_drvdata(dev);
518 atomic_inc(&psy->use_cnt);
519 }
520
521 return psy;
522}
523EXPORT_SYMBOL_GPL(power_supply_get_by_phandle);
524
525static void devm_power_supply_put(struct device *dev, void *res)
526{
527 struct power_supply **psy = res;
528
529 power_supply_put(*psy);
530}
531
532
533
534
535
536
537
538
539
540
541struct power_supply *devm_power_supply_get_by_phandle(struct device *dev,
542 const char *property)
543{
544 struct power_supply **ptr, *psy;
545
546 if (!dev->of_node)
547 return ERR_PTR(-ENODEV);
548
549 ptr = devres_alloc(devm_power_supply_put, sizeof(*ptr), GFP_KERNEL);
550 if (!ptr)
551 return ERR_PTR(-ENOMEM);
552
553 psy = power_supply_get_by_phandle(dev->of_node, property);
554 if (IS_ERR_OR_NULL(psy)) {
555 devres_free(ptr);
556 } else {
557 *ptr = psy;
558 devres_add(dev, ptr);
559 }
560 return psy;
561}
562EXPORT_SYMBOL_GPL(devm_power_supply_get_by_phandle);
563#endif
564
565int power_supply_get_battery_info(struct power_supply *psy,
566 struct power_supply_battery_info *info)
567{
568 struct power_supply_resistance_temp_table *resist_table;
569 struct device_node *battery_np;
570 const char *value;
571 int err, len, index;
572 const __be32 *list;
573
574 info->energy_full_design_uwh = -EINVAL;
575 info->charge_full_design_uah = -EINVAL;
576 info->voltage_min_design_uv = -EINVAL;
577 info->voltage_max_design_uv = -EINVAL;
578 info->precharge_current_ua = -EINVAL;
579 info->charge_term_current_ua = -EINVAL;
580 info->constant_charge_current_max_ua = -EINVAL;
581 info->constant_charge_voltage_max_uv = -EINVAL;
582 info->factory_internal_resistance_uohm = -EINVAL;
583 info->resist_table = NULL;
584
585 for (index = 0; index < POWER_SUPPLY_OCV_TEMP_MAX; index++) {
586 info->ocv_table[index] = NULL;
587 info->ocv_temp[index] = -EINVAL;
588 info->ocv_table_size[index] = -EINVAL;
589 }
590
591 if (!psy->of_node) {
592 dev_warn(&psy->dev, "%s currently only supports devicetree\n",
593 __func__);
594 return -ENXIO;
595 }
596
597 battery_np = of_parse_phandle(psy->of_node, "monitored-battery", 0);
598 if (!battery_np)
599 return -ENODEV;
600
601 err = of_property_read_string(battery_np, "compatible", &value);
602 if (err)
603 goto out_put_node;
604
605 if (strcmp("simple-battery", value)) {
606 err = -ENODEV;
607 goto out_put_node;
608 }
609
610
611
612
613
614
615 of_property_read_u32(battery_np, "energy-full-design-microwatt-hours",
616 &info->energy_full_design_uwh);
617 of_property_read_u32(battery_np, "charge-full-design-microamp-hours",
618 &info->charge_full_design_uah);
619 of_property_read_u32(battery_np, "voltage-min-design-microvolt",
620 &info->voltage_min_design_uv);
621 of_property_read_u32(battery_np, "voltage-max-design-microvolt",
622 &info->voltage_max_design_uv);
623 of_property_read_u32(battery_np, "precharge-current-microamp",
624 &info->precharge_current_ua);
625 of_property_read_u32(battery_np, "charge-term-current-microamp",
626 &info->charge_term_current_ua);
627 of_property_read_u32(battery_np, "constant-charge-current-max-microamp",
628 &info->constant_charge_current_max_ua);
629 of_property_read_u32(battery_np, "constant-charge-voltage-max-microvolt",
630 &info->constant_charge_voltage_max_uv);
631 of_property_read_u32(battery_np, "factory-internal-resistance-micro-ohms",
632 &info->factory_internal_resistance_uohm);
633
634 len = of_property_count_u32_elems(battery_np, "ocv-capacity-celsius");
635 if (len < 0 && len != -EINVAL) {
636 err = len;
637 goto out_put_node;
638 } else if (len > POWER_SUPPLY_OCV_TEMP_MAX) {
639 dev_err(&psy->dev, "Too many temperature values\n");
640 err = -EINVAL;
641 goto out_put_node;
642 } else if (len > 0) {
643 of_property_read_u32_array(battery_np, "ocv-capacity-celsius",
644 info->ocv_temp, len);
645 }
646
647 for (index = 0; index < len; index++) {
648 struct power_supply_battery_ocv_table *table;
649 char *propname;
650 int i, tab_len, size;
651
652 propname = kasprintf(GFP_KERNEL, "ocv-capacity-table-%d", index);
653 list = of_get_property(battery_np, propname, &size);
654 if (!list || !size) {
655 dev_err(&psy->dev, "failed to get %s\n", propname);
656 kfree(propname);
657 power_supply_put_battery_info(psy, info);
658 err = -EINVAL;
659 goto out_put_node;
660 }
661
662 kfree(propname);
663 tab_len = size / (2 * sizeof(__be32));
664 info->ocv_table_size[index] = tab_len;
665
666 table = info->ocv_table[index] =
667 devm_kcalloc(&psy->dev, tab_len, sizeof(*table), GFP_KERNEL);
668 if (!info->ocv_table[index]) {
669 power_supply_put_battery_info(psy, info);
670 err = -ENOMEM;
671 goto out_put_node;
672 }
673
674 for (i = 0; i < tab_len; i++) {
675 table[i].ocv = be32_to_cpu(*list);
676 list++;
677 table[i].capacity = be32_to_cpu(*list);
678 list++;
679 }
680 }
681
682 list = of_get_property(battery_np, "resistance-temp-table", &len);
683 if (!list || !len)
684 goto out_put_node;
685
686 info->resist_table_size = len / (2 * sizeof(__be32));
687 resist_table = info->resist_table = devm_kcalloc(&psy->dev,
688 info->resist_table_size,
689 sizeof(*resist_table),
690 GFP_KERNEL);
691 if (!info->resist_table) {
692 power_supply_put_battery_info(psy, info);
693 err = -ENOMEM;
694 goto out_put_node;
695 }
696
697 for (index = 0; index < info->resist_table_size; index++) {
698 resist_table[index].temp = be32_to_cpu(*list++);
699 resist_table[index].resistance = be32_to_cpu(*list++);
700 }
701
702out_put_node:
703 of_node_put(battery_np);
704 return err;
705}
706EXPORT_SYMBOL_GPL(power_supply_get_battery_info);
707
708void power_supply_put_battery_info(struct power_supply *psy,
709 struct power_supply_battery_info *info)
710{
711 int i;
712
713 for (i = 0; i < POWER_SUPPLY_OCV_TEMP_MAX; i++) {
714 if (info->ocv_table[i])
715 devm_kfree(&psy->dev, info->ocv_table[i]);
716 }
717
718 if (info->resist_table)
719 devm_kfree(&psy->dev, info->resist_table);
720}
721EXPORT_SYMBOL_GPL(power_supply_put_battery_info);
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737int power_supply_temp2resist_simple(struct power_supply_resistance_temp_table *table,
738 int table_len, int temp)
739{
740 int i, resist;
741
742 for (i = 0; i < table_len; i++)
743 if (temp > table[i].temp)
744 break;
745
746 if (i > 0 && i < table_len) {
747 int tmp;
748
749 tmp = (table[i - 1].resistance - table[i].resistance) *
750 (temp - table[i].temp);
751 tmp /= table[i - 1].temp - table[i].temp;
752 resist = tmp + table[i].resistance;
753 } else if (i == 0) {
754 resist = table[0].resistance;
755 } else {
756 resist = table[table_len - 1].resistance;
757 }
758
759 return resist;
760}
761EXPORT_SYMBOL_GPL(power_supply_temp2resist_simple);
762
763
764
765
766
767
768
769
770
771
772
773
774
775int power_supply_ocv2cap_simple(struct power_supply_battery_ocv_table *table,
776 int table_len, int ocv)
777{
778 int i, cap, tmp;
779
780 for (i = 0; i < table_len; i++)
781 if (ocv > table[i].ocv)
782 break;
783
784 if (i > 0 && i < table_len) {
785 tmp = (table[i - 1].capacity - table[i].capacity) *
786 (ocv - table[i].ocv);
787 tmp /= table[i - 1].ocv - table[i].ocv;
788 cap = tmp + table[i].capacity;
789 } else if (i == 0) {
790 cap = table[0].capacity;
791 } else {
792 cap = table[table_len - 1].capacity;
793 }
794
795 return cap;
796}
797EXPORT_SYMBOL_GPL(power_supply_ocv2cap_simple);
798
799struct power_supply_battery_ocv_table *
800power_supply_find_ocv2cap_table(struct power_supply_battery_info *info,
801 int temp, int *table_len)
802{
803 int best_temp_diff = INT_MAX, temp_diff;
804 u8 i, best_index = 0;
805
806 if (!info->ocv_table[0])
807 return NULL;
808
809 for (i = 0; i < POWER_SUPPLY_OCV_TEMP_MAX; i++) {
810 temp_diff = abs(info->ocv_temp[i] - temp);
811
812 if (temp_diff < best_temp_diff) {
813 best_temp_diff = temp_diff;
814 best_index = i;
815 }
816 }
817
818 *table_len = info->ocv_table_size[best_index];
819 return info->ocv_table[best_index];
820}
821EXPORT_SYMBOL_GPL(power_supply_find_ocv2cap_table);
822
823int power_supply_batinfo_ocv2cap(struct power_supply_battery_info *info,
824 int ocv, int temp)
825{
826 struct power_supply_battery_ocv_table *table;
827 int table_len;
828
829 table = power_supply_find_ocv2cap_table(info, temp, &table_len);
830 if (!table)
831 return -EINVAL;
832
833 return power_supply_ocv2cap_simple(table, table_len, ocv);
834}
835EXPORT_SYMBOL_GPL(power_supply_batinfo_ocv2cap);
836
837int power_supply_get_property(struct power_supply *psy,
838 enum power_supply_property psp,
839 union power_supply_propval *val)
840{
841 if (atomic_read(&psy->use_cnt) <= 0) {
842 if (!psy->initialized)
843 return -EAGAIN;
844 return -ENODEV;
845 }
846
847 return psy->desc->get_property(psy, psp, val);
848}
849EXPORT_SYMBOL_GPL(power_supply_get_property);
850
851int power_supply_set_property(struct power_supply *psy,
852 enum power_supply_property psp,
853 const union power_supply_propval *val)
854{
855 if (atomic_read(&psy->use_cnt) <= 0 || !psy->desc->set_property)
856 return -ENODEV;
857
858 return psy->desc->set_property(psy, psp, val);
859}
860EXPORT_SYMBOL_GPL(power_supply_set_property);
861
862int power_supply_property_is_writeable(struct power_supply *psy,
863 enum power_supply_property psp)
864{
865 if (atomic_read(&psy->use_cnt) <= 0 ||
866 !psy->desc->property_is_writeable)
867 return -ENODEV;
868
869 return psy->desc->property_is_writeable(psy, psp);
870}
871EXPORT_SYMBOL_GPL(power_supply_property_is_writeable);
872
873void power_supply_external_power_changed(struct power_supply *psy)
874{
875 if (atomic_read(&psy->use_cnt) <= 0 ||
876 !psy->desc->external_power_changed)
877 return;
878
879 psy->desc->external_power_changed(psy);
880}
881EXPORT_SYMBOL_GPL(power_supply_external_power_changed);
882
883int power_supply_powers(struct power_supply *psy, struct device *dev)
884{
885 return sysfs_create_link(&psy->dev.kobj, &dev->kobj, "powers");
886}
887EXPORT_SYMBOL_GPL(power_supply_powers);
888
889static void power_supply_dev_release(struct device *dev)
890{
891 struct power_supply *psy = to_power_supply(dev);
892 dev_dbg(dev, "%s\n", __func__);
893 kfree(psy);
894}
895
896int power_supply_reg_notifier(struct notifier_block *nb)
897{
898 return atomic_notifier_chain_register(&power_supply_notifier, nb);
899}
900EXPORT_SYMBOL_GPL(power_supply_reg_notifier);
901
902void power_supply_unreg_notifier(struct notifier_block *nb)
903{
904 atomic_notifier_chain_unregister(&power_supply_notifier, nb);
905}
906EXPORT_SYMBOL_GPL(power_supply_unreg_notifier);
907
908#ifdef CONFIG_THERMAL
909static int power_supply_read_temp(struct thermal_zone_device *tzd,
910 int *temp)
911{
912 struct power_supply *psy;
913 union power_supply_propval val;
914 int ret;
915
916 WARN_ON(tzd == NULL);
917 psy = tzd->devdata;
918 ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_TEMP, &val);
919 if (ret)
920 return ret;
921
922
923 *temp = val.intval * 100;
924
925 return ret;
926}
927
928static struct thermal_zone_device_ops psy_tzd_ops = {
929 .get_temp = power_supply_read_temp,
930};
931
932static int psy_register_thermal(struct power_supply *psy)
933{
934 int i;
935
936 if (psy->desc->no_thermal)
937 return 0;
938
939
940 for (i = 0; i < psy->desc->num_properties; i++) {
941 if (psy->desc->properties[i] == POWER_SUPPLY_PROP_TEMP) {
942 psy->tzd = thermal_zone_device_register(psy->desc->name,
943 0, 0, psy, &psy_tzd_ops, NULL, 0, 0);
944 return PTR_ERR_OR_ZERO(psy->tzd);
945 }
946 }
947 return 0;
948}
949
950static void psy_unregister_thermal(struct power_supply *psy)
951{
952 if (IS_ERR_OR_NULL(psy->tzd))
953 return;
954 thermal_zone_device_unregister(psy->tzd);
955}
956
957
958static int ps_get_max_charge_cntl_limit(struct thermal_cooling_device *tcd,
959 unsigned long *state)
960{
961 struct power_supply *psy;
962 union power_supply_propval val;
963 int ret;
964
965 psy = tcd->devdata;
966 ret = power_supply_get_property(psy,
967 POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT_MAX, &val);
968 if (ret)
969 return ret;
970
971 *state = val.intval;
972
973 return ret;
974}
975
976static int ps_get_cur_charge_cntl_limit(struct thermal_cooling_device *tcd,
977 unsigned long *state)
978{
979 struct power_supply *psy;
980 union power_supply_propval val;
981 int ret;
982
983 psy = tcd->devdata;
984 ret = power_supply_get_property(psy,
985 POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT, &val);
986 if (ret)
987 return ret;
988
989 *state = val.intval;
990
991 return ret;
992}
993
994static int ps_set_cur_charge_cntl_limit(struct thermal_cooling_device *tcd,
995 unsigned long state)
996{
997 struct power_supply *psy;
998 union power_supply_propval val;
999 int ret;
1000
1001 psy = tcd->devdata;
1002 val.intval = state;
1003 ret = psy->desc->set_property(psy,
1004 POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT, &val);
1005
1006 return ret;
1007}
1008
1009static const struct thermal_cooling_device_ops psy_tcd_ops = {
1010 .get_max_state = ps_get_max_charge_cntl_limit,
1011 .get_cur_state = ps_get_cur_charge_cntl_limit,
1012 .set_cur_state = ps_set_cur_charge_cntl_limit,
1013};
1014
1015static int psy_register_cooler(struct power_supply *psy)
1016{
1017 int i;
1018
1019
1020 for (i = 0; i < psy->desc->num_properties; i++) {
1021 if (psy->desc->properties[i] ==
1022 POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT) {
1023 psy->tcd = thermal_cooling_device_register(
1024 (char *)psy->desc->name,
1025 psy, &psy_tcd_ops);
1026 return PTR_ERR_OR_ZERO(psy->tcd);
1027 }
1028 }
1029 return 0;
1030}
1031
1032static void psy_unregister_cooler(struct power_supply *psy)
1033{
1034 if (IS_ERR_OR_NULL(psy->tcd))
1035 return;
1036 thermal_cooling_device_unregister(psy->tcd);
1037}
1038#else
1039static int psy_register_thermal(struct power_supply *psy)
1040{
1041 return 0;
1042}
1043
1044static void psy_unregister_thermal(struct power_supply *psy)
1045{
1046}
1047
1048static int psy_register_cooler(struct power_supply *psy)
1049{
1050 return 0;
1051}
1052
1053static void psy_unregister_cooler(struct power_supply *psy)
1054{
1055}
1056#endif
1057
1058static struct power_supply *__must_check
1059__power_supply_register(struct device *parent,
1060 const struct power_supply_desc *desc,
1061 const struct power_supply_config *cfg,
1062 bool ws)
1063{
1064 struct device *dev;
1065 struct power_supply *psy;
1066 int i, rc;
1067
1068 if (!parent)
1069 pr_warn("%s: Expected proper parent device for '%s'\n",
1070 __func__, desc->name);
1071
1072 if (!desc || !desc->name || !desc->properties || !desc->num_properties)
1073 return ERR_PTR(-EINVAL);
1074
1075 for (i = 0; i < desc->num_properties; ++i) {
1076 if ((desc->properties[i] == POWER_SUPPLY_PROP_USB_TYPE) &&
1077 (!desc->usb_types || !desc->num_usb_types))
1078 return ERR_PTR(-EINVAL);
1079 }
1080
1081 psy = kzalloc(sizeof(*psy), GFP_KERNEL);
1082 if (!psy)
1083 return ERR_PTR(-ENOMEM);
1084
1085 dev = &psy->dev;
1086
1087 device_initialize(dev);
1088
1089 dev->class = power_supply_class;
1090 dev->type = &power_supply_dev_type;
1091 dev->parent = parent;
1092 dev->release = power_supply_dev_release;
1093 dev_set_drvdata(dev, psy);
1094 psy->desc = desc;
1095 if (cfg) {
1096 dev->groups = cfg->attr_grp;
1097 psy->drv_data = cfg->drv_data;
1098 psy->of_node =
1099 cfg->fwnode ? to_of_node(cfg->fwnode) : cfg->of_node;
1100 psy->supplied_to = cfg->supplied_to;
1101 psy->num_supplicants = cfg->num_supplicants;
1102 }
1103
1104 rc = dev_set_name(dev, "%s", desc->name);
1105 if (rc)
1106 goto dev_set_name_failed;
1107
1108 INIT_WORK(&psy->changed_work, power_supply_changed_work);
1109 INIT_DELAYED_WORK(&psy->deferred_register_work,
1110 power_supply_deferred_register_work);
1111
1112 rc = power_supply_check_supplies(psy);
1113 if (rc) {
1114 dev_info(dev, "Not all required supplies found, defer probe\n");
1115 goto check_supplies_failed;
1116 }
1117
1118 spin_lock_init(&psy->changed_lock);
1119 rc = device_add(dev);
1120 if (rc)
1121 goto device_add_failed;
1122
1123 rc = device_init_wakeup(dev, ws);
1124 if (rc)
1125 goto wakeup_init_failed;
1126
1127 rc = psy_register_thermal(psy);
1128 if (rc)
1129 goto register_thermal_failed;
1130
1131 rc = psy_register_cooler(psy);
1132 if (rc)
1133 goto register_cooler_failed;
1134
1135 rc = power_supply_create_triggers(psy);
1136 if (rc)
1137 goto create_triggers_failed;
1138
1139 rc = power_supply_add_hwmon_sysfs(psy);
1140 if (rc)
1141 goto add_hwmon_sysfs_failed;
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152 atomic_inc(&psy->use_cnt);
1153 psy->initialized = true;
1154
1155 queue_delayed_work(system_power_efficient_wq,
1156 &psy->deferred_register_work,
1157 POWER_SUPPLY_DEFERRED_REGISTER_TIME);
1158
1159 return psy;
1160
1161add_hwmon_sysfs_failed:
1162 power_supply_remove_triggers(psy);
1163create_triggers_failed:
1164 psy_unregister_cooler(psy);
1165register_cooler_failed:
1166 psy_unregister_thermal(psy);
1167register_thermal_failed:
1168 device_del(dev);
1169wakeup_init_failed:
1170device_add_failed:
1171check_supplies_failed:
1172dev_set_name_failed:
1173 put_device(dev);
1174 return ERR_PTR(rc);
1175}
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191struct power_supply *__must_check power_supply_register(struct device *parent,
1192 const struct power_supply_desc *desc,
1193 const struct power_supply_config *cfg)
1194{
1195 return __power_supply_register(parent, desc, cfg, true);
1196}
1197EXPORT_SYMBOL_GPL(power_supply_register);
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213struct power_supply *__must_check
1214power_supply_register_no_ws(struct device *parent,
1215 const struct power_supply_desc *desc,
1216 const struct power_supply_config *cfg)
1217{
1218 return __power_supply_register(parent, desc, cfg, false);
1219}
1220EXPORT_SYMBOL_GPL(power_supply_register_no_ws);
1221
1222static void devm_power_supply_release(struct device *dev, void *res)
1223{
1224 struct power_supply **psy = res;
1225
1226 power_supply_unregister(*psy);
1227}
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243struct power_supply *__must_check
1244devm_power_supply_register(struct device *parent,
1245 const struct power_supply_desc *desc,
1246 const struct power_supply_config *cfg)
1247{
1248 struct power_supply **ptr, *psy;
1249
1250 ptr = devres_alloc(devm_power_supply_release, sizeof(*ptr), GFP_KERNEL);
1251
1252 if (!ptr)
1253 return ERR_PTR(-ENOMEM);
1254 psy = __power_supply_register(parent, desc, cfg, true);
1255 if (IS_ERR(psy)) {
1256 devres_free(ptr);
1257 } else {
1258 *ptr = psy;
1259 devres_add(parent, ptr);
1260 }
1261 return psy;
1262}
1263EXPORT_SYMBOL_GPL(devm_power_supply_register);
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279struct power_supply *__must_check
1280devm_power_supply_register_no_ws(struct device *parent,
1281 const struct power_supply_desc *desc,
1282 const struct power_supply_config *cfg)
1283{
1284 struct power_supply **ptr, *psy;
1285
1286 ptr = devres_alloc(devm_power_supply_release, sizeof(*ptr), GFP_KERNEL);
1287
1288 if (!ptr)
1289 return ERR_PTR(-ENOMEM);
1290 psy = __power_supply_register(parent, desc, cfg, false);
1291 if (IS_ERR(psy)) {
1292 devres_free(ptr);
1293 } else {
1294 *ptr = psy;
1295 devres_add(parent, ptr);
1296 }
1297 return psy;
1298}
1299EXPORT_SYMBOL_GPL(devm_power_supply_register_no_ws);
1300
1301
1302
1303
1304
1305
1306
1307
1308void power_supply_unregister(struct power_supply *psy)
1309{
1310 WARN_ON(atomic_dec_return(&psy->use_cnt));
1311 psy->removing = true;
1312 cancel_work_sync(&psy->changed_work);
1313 cancel_delayed_work_sync(&psy->deferred_register_work);
1314 sysfs_remove_link(&psy->dev.kobj, "powers");
1315 power_supply_remove_hwmon_sysfs(psy);
1316 power_supply_remove_triggers(psy);
1317 psy_unregister_cooler(psy);
1318 psy_unregister_thermal(psy);
1319 device_init_wakeup(&psy->dev, false);
1320 device_unregister(&psy->dev);
1321}
1322EXPORT_SYMBOL_GPL(power_supply_unregister);
1323
1324void *power_supply_get_drvdata(struct power_supply *psy)
1325{
1326 return psy->drv_data;
1327}
1328EXPORT_SYMBOL_GPL(power_supply_get_drvdata);
1329
1330static int __init power_supply_class_init(void)
1331{
1332 power_supply_class = class_create(THIS_MODULE, "power_supply");
1333
1334 if (IS_ERR(power_supply_class))
1335 return PTR_ERR(power_supply_class);
1336
1337 power_supply_class->dev_uevent = power_supply_uevent;
1338 power_supply_init_attrs(&power_supply_dev_type);
1339
1340 return 0;
1341}
1342
1343static void __exit power_supply_class_exit(void)
1344{
1345 class_destroy(power_supply_class);
1346}
1347
1348subsys_initcall(power_supply_class_init);
1349module_exit(power_supply_class_exit);
1350
1351MODULE_DESCRIPTION("Universal power supply monitor class");
1352MODULE_AUTHOR("Ian Molton <spyro@f2s.com>, "
1353 "Szabolcs Gyurko, "
1354 "Anton Vorontsov <cbou@mail.ru>");
1355MODULE_LICENSE("GPL");
1356