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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_dbg(&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->technology = POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
575 info->energy_full_design_uwh = -EINVAL;
576 info->charge_full_design_uah = -EINVAL;
577 info->voltage_min_design_uv = -EINVAL;
578 info->voltage_max_design_uv = -EINVAL;
579 info->precharge_current_ua = -EINVAL;
580 info->charge_term_current_ua = -EINVAL;
581 info->constant_charge_current_max_ua = -EINVAL;
582 info->constant_charge_voltage_max_uv = -EINVAL;
583 info->temp_ambient_alert_min = INT_MIN;
584 info->temp_ambient_alert_max = INT_MAX;
585 info->temp_alert_min = INT_MIN;
586 info->temp_alert_max = INT_MAX;
587 info->temp_min = INT_MIN;
588 info->temp_max = INT_MAX;
589 info->factory_internal_resistance_uohm = -EINVAL;
590 info->resist_table = NULL;
591
592 for (index = 0; index < POWER_SUPPLY_OCV_TEMP_MAX; index++) {
593 info->ocv_table[index] = NULL;
594 info->ocv_temp[index] = -EINVAL;
595 info->ocv_table_size[index] = -EINVAL;
596 }
597
598 if (!psy->of_node) {
599 dev_warn(&psy->dev, "%s currently only supports devicetree\n",
600 __func__);
601 return -ENXIO;
602 }
603
604 battery_np = of_parse_phandle(psy->of_node, "monitored-battery", 0);
605 if (!battery_np)
606 return -ENODEV;
607
608 err = of_property_read_string(battery_np, "compatible", &value);
609 if (err)
610 goto out_put_node;
611
612 if (strcmp("simple-battery", value)) {
613 err = -ENODEV;
614 goto out_put_node;
615 }
616
617
618
619
620
621
622 if (!of_property_read_string(battery_np, "device-chemistry", &value)) {
623 if (!strcmp("nickel-cadmium", value))
624 info->technology = POWER_SUPPLY_TECHNOLOGY_NiCd;
625 else if (!strcmp("nickel-metal-hydride", value))
626 info->technology = POWER_SUPPLY_TECHNOLOGY_NiMH;
627 else if (!strcmp("lithium-ion", value))
628
629 info->technology = POWER_SUPPLY_TECHNOLOGY_LION;
630 else if (!strcmp("lithium-ion-polymer", value))
631 info->technology = POWER_SUPPLY_TECHNOLOGY_LIPO;
632 else if (!strcmp("lithium-ion-iron-phosphate", value))
633 info->technology = POWER_SUPPLY_TECHNOLOGY_LiFe;
634 else if (!strcmp("lithium-ion-manganese-oxide", value))
635 info->technology = POWER_SUPPLY_TECHNOLOGY_LiMn;
636 else
637 dev_warn(&psy->dev, "%s unknown battery type\n", value);
638 }
639
640 of_property_read_u32(battery_np, "energy-full-design-microwatt-hours",
641 &info->energy_full_design_uwh);
642 of_property_read_u32(battery_np, "charge-full-design-microamp-hours",
643 &info->charge_full_design_uah);
644 of_property_read_u32(battery_np, "voltage-min-design-microvolt",
645 &info->voltage_min_design_uv);
646 of_property_read_u32(battery_np, "voltage-max-design-microvolt",
647 &info->voltage_max_design_uv);
648 of_property_read_u32(battery_np, "trickle-charge-current-microamp",
649 &info->tricklecharge_current_ua);
650 of_property_read_u32(battery_np, "precharge-current-microamp",
651 &info->precharge_current_ua);
652 of_property_read_u32(battery_np, "precharge-upper-limit-microvolt",
653 &info->precharge_voltage_max_uv);
654 of_property_read_u32(battery_np, "charge-term-current-microamp",
655 &info->charge_term_current_ua);
656 of_property_read_u32(battery_np, "re-charge-voltage-microvolt",
657 &info->charge_restart_voltage_uv);
658 of_property_read_u32(battery_np, "over-voltage-threshold-microvolt",
659 &info->overvoltage_limit_uv);
660 of_property_read_u32(battery_np, "constant-charge-current-max-microamp",
661 &info->constant_charge_current_max_ua);
662 of_property_read_u32(battery_np, "constant-charge-voltage-max-microvolt",
663 &info->constant_charge_voltage_max_uv);
664 of_property_read_u32(battery_np, "factory-internal-resistance-micro-ohms",
665 &info->factory_internal_resistance_uohm);
666
667 of_property_read_u32_index(battery_np, "ambient-celsius",
668 0, &info->temp_ambient_alert_min);
669 of_property_read_u32_index(battery_np, "ambient-celsius",
670 1, &info->temp_ambient_alert_max);
671 of_property_read_u32_index(battery_np, "alert-celsius",
672 0, &info->temp_alert_min);
673 of_property_read_u32_index(battery_np, "alert-celsius",
674 1, &info->temp_alert_max);
675 of_property_read_u32_index(battery_np, "operating-range-celsius",
676 0, &info->temp_min);
677 of_property_read_u32_index(battery_np, "operating-range-celsius",
678 1, &info->temp_max);
679
680 len = of_property_count_u32_elems(battery_np, "ocv-capacity-celsius");
681 if (len < 0 && len != -EINVAL) {
682 err = len;
683 goto out_put_node;
684 } else if (len > POWER_SUPPLY_OCV_TEMP_MAX) {
685 dev_err(&psy->dev, "Too many temperature values\n");
686 err = -EINVAL;
687 goto out_put_node;
688 } else if (len > 0) {
689 of_property_read_u32_array(battery_np, "ocv-capacity-celsius",
690 info->ocv_temp, len);
691 }
692
693 for (index = 0; index < len; index++) {
694 struct power_supply_battery_ocv_table *table;
695 char *propname;
696 int i, tab_len, size;
697
698 propname = kasprintf(GFP_KERNEL, "ocv-capacity-table-%d", index);
699 list = of_get_property(battery_np, propname, &size);
700 if (!list || !size) {
701 dev_err(&psy->dev, "failed to get %s\n", propname);
702 kfree(propname);
703 power_supply_put_battery_info(psy, info);
704 err = -EINVAL;
705 goto out_put_node;
706 }
707
708 kfree(propname);
709 tab_len = size / (2 * sizeof(__be32));
710 info->ocv_table_size[index] = tab_len;
711
712 table = info->ocv_table[index] =
713 devm_kcalloc(&psy->dev, tab_len, sizeof(*table), GFP_KERNEL);
714 if (!info->ocv_table[index]) {
715 power_supply_put_battery_info(psy, info);
716 err = -ENOMEM;
717 goto out_put_node;
718 }
719
720 for (i = 0; i < tab_len; i++) {
721 table[i].ocv = be32_to_cpu(*list);
722 list++;
723 table[i].capacity = be32_to_cpu(*list);
724 list++;
725 }
726 }
727
728 list = of_get_property(battery_np, "resistance-temp-table", &len);
729 if (!list || !len)
730 goto out_put_node;
731
732 info->resist_table_size = len / (2 * sizeof(__be32));
733 resist_table = info->resist_table = devm_kcalloc(&psy->dev,
734 info->resist_table_size,
735 sizeof(*resist_table),
736 GFP_KERNEL);
737 if (!info->resist_table) {
738 power_supply_put_battery_info(psy, info);
739 err = -ENOMEM;
740 goto out_put_node;
741 }
742
743 for (index = 0; index < info->resist_table_size; index++) {
744 resist_table[index].temp = be32_to_cpu(*list++);
745 resist_table[index].resistance = be32_to_cpu(*list++);
746 }
747
748out_put_node:
749 of_node_put(battery_np);
750 return err;
751}
752EXPORT_SYMBOL_GPL(power_supply_get_battery_info);
753
754void power_supply_put_battery_info(struct power_supply *psy,
755 struct power_supply_battery_info *info)
756{
757 int i;
758
759 for (i = 0; i < POWER_SUPPLY_OCV_TEMP_MAX; i++) {
760 if (info->ocv_table[i])
761 devm_kfree(&psy->dev, info->ocv_table[i]);
762 }
763
764 if (info->resist_table)
765 devm_kfree(&psy->dev, info->resist_table);
766}
767EXPORT_SYMBOL_GPL(power_supply_put_battery_info);
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783int power_supply_temp2resist_simple(struct power_supply_resistance_temp_table *table,
784 int table_len, int temp)
785{
786 int i, resist;
787
788 for (i = 0; i < table_len; i++)
789 if (temp > table[i].temp)
790 break;
791
792 if (i > 0 && i < table_len) {
793 int tmp;
794
795 tmp = (table[i - 1].resistance - table[i].resistance) *
796 (temp - table[i].temp);
797 tmp /= table[i - 1].temp - table[i].temp;
798 resist = tmp + table[i].resistance;
799 } else if (i == 0) {
800 resist = table[0].resistance;
801 } else {
802 resist = table[table_len - 1].resistance;
803 }
804
805 return resist;
806}
807EXPORT_SYMBOL_GPL(power_supply_temp2resist_simple);
808
809
810
811
812
813
814
815
816
817
818
819
820
821int power_supply_ocv2cap_simple(struct power_supply_battery_ocv_table *table,
822 int table_len, int ocv)
823{
824 int i, cap, tmp;
825
826 for (i = 0; i < table_len; i++)
827 if (ocv > table[i].ocv)
828 break;
829
830 if (i > 0 && i < table_len) {
831 tmp = (table[i - 1].capacity - table[i].capacity) *
832 (ocv - table[i].ocv);
833 tmp /= table[i - 1].ocv - table[i].ocv;
834 cap = tmp + table[i].capacity;
835 } else if (i == 0) {
836 cap = table[0].capacity;
837 } else {
838 cap = table[table_len - 1].capacity;
839 }
840
841 return cap;
842}
843EXPORT_SYMBOL_GPL(power_supply_ocv2cap_simple);
844
845struct power_supply_battery_ocv_table *
846power_supply_find_ocv2cap_table(struct power_supply_battery_info *info,
847 int temp, int *table_len)
848{
849 int best_temp_diff = INT_MAX, temp_diff;
850 u8 i, best_index = 0;
851
852 if (!info->ocv_table[0])
853 return NULL;
854
855 for (i = 0; i < POWER_SUPPLY_OCV_TEMP_MAX; i++) {
856 temp_diff = abs(info->ocv_temp[i] - temp);
857
858 if (temp_diff < best_temp_diff) {
859 best_temp_diff = temp_diff;
860 best_index = i;
861 }
862 }
863
864 *table_len = info->ocv_table_size[best_index];
865 return info->ocv_table[best_index];
866}
867EXPORT_SYMBOL_GPL(power_supply_find_ocv2cap_table);
868
869int power_supply_batinfo_ocv2cap(struct power_supply_battery_info *info,
870 int ocv, int temp)
871{
872 struct power_supply_battery_ocv_table *table;
873 int table_len;
874
875 table = power_supply_find_ocv2cap_table(info, temp, &table_len);
876 if (!table)
877 return -EINVAL;
878
879 return power_supply_ocv2cap_simple(table, table_len, ocv);
880}
881EXPORT_SYMBOL_GPL(power_supply_batinfo_ocv2cap);
882
883int power_supply_get_property(struct power_supply *psy,
884 enum power_supply_property psp,
885 union power_supply_propval *val)
886{
887 if (atomic_read(&psy->use_cnt) <= 0) {
888 if (!psy->initialized)
889 return -EAGAIN;
890 return -ENODEV;
891 }
892
893 return psy->desc->get_property(psy, psp, val);
894}
895EXPORT_SYMBOL_GPL(power_supply_get_property);
896
897int power_supply_set_property(struct power_supply *psy,
898 enum power_supply_property psp,
899 const union power_supply_propval *val)
900{
901 if (atomic_read(&psy->use_cnt) <= 0 || !psy->desc->set_property)
902 return -ENODEV;
903
904 return psy->desc->set_property(psy, psp, val);
905}
906EXPORT_SYMBOL_GPL(power_supply_set_property);
907
908int power_supply_property_is_writeable(struct power_supply *psy,
909 enum power_supply_property psp)
910{
911 if (atomic_read(&psy->use_cnt) <= 0 ||
912 !psy->desc->property_is_writeable)
913 return -ENODEV;
914
915 return psy->desc->property_is_writeable(psy, psp);
916}
917EXPORT_SYMBOL_GPL(power_supply_property_is_writeable);
918
919void power_supply_external_power_changed(struct power_supply *psy)
920{
921 if (atomic_read(&psy->use_cnt) <= 0 ||
922 !psy->desc->external_power_changed)
923 return;
924
925 psy->desc->external_power_changed(psy);
926}
927EXPORT_SYMBOL_GPL(power_supply_external_power_changed);
928
929int power_supply_powers(struct power_supply *psy, struct device *dev)
930{
931 return sysfs_create_link(&psy->dev.kobj, &dev->kobj, "powers");
932}
933EXPORT_SYMBOL_GPL(power_supply_powers);
934
935static void power_supply_dev_release(struct device *dev)
936{
937 struct power_supply *psy = to_power_supply(dev);
938 dev_dbg(dev, "%s\n", __func__);
939 kfree(psy);
940}
941
942int power_supply_reg_notifier(struct notifier_block *nb)
943{
944 return atomic_notifier_chain_register(&power_supply_notifier, nb);
945}
946EXPORT_SYMBOL_GPL(power_supply_reg_notifier);
947
948void power_supply_unreg_notifier(struct notifier_block *nb)
949{
950 atomic_notifier_chain_unregister(&power_supply_notifier, nb);
951}
952EXPORT_SYMBOL_GPL(power_supply_unreg_notifier);
953
954#ifdef CONFIG_THERMAL
955static int power_supply_read_temp(struct thermal_zone_device *tzd,
956 int *temp)
957{
958 struct power_supply *psy;
959 union power_supply_propval val;
960 int ret;
961
962 WARN_ON(tzd == NULL);
963 psy = tzd->devdata;
964 ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_TEMP, &val);
965 if (ret)
966 return ret;
967
968
969 *temp = val.intval * 100;
970
971 return ret;
972}
973
974static struct thermal_zone_device_ops psy_tzd_ops = {
975 .get_temp = power_supply_read_temp,
976};
977
978static int psy_register_thermal(struct power_supply *psy)
979{
980 int i, ret;
981
982 if (psy->desc->no_thermal)
983 return 0;
984
985
986 for (i = 0; i < psy->desc->num_properties; i++) {
987 if (psy->desc->properties[i] == POWER_SUPPLY_PROP_TEMP) {
988 psy->tzd = thermal_zone_device_register(psy->desc->name,
989 0, 0, psy, &psy_tzd_ops, NULL, 0, 0);
990 if (IS_ERR(psy->tzd))
991 return PTR_ERR(psy->tzd);
992 ret = thermal_zone_device_enable(psy->tzd);
993 if (ret)
994 thermal_zone_device_unregister(psy->tzd);
995 return ret;
996 }
997 }
998 return 0;
999}
1000
1001static void psy_unregister_thermal(struct power_supply *psy)
1002{
1003 if (IS_ERR_OR_NULL(psy->tzd))
1004 return;
1005 thermal_zone_device_unregister(psy->tzd);
1006}
1007
1008
1009static int ps_get_max_charge_cntl_limit(struct thermal_cooling_device *tcd,
1010 unsigned long *state)
1011{
1012 struct power_supply *psy;
1013 union power_supply_propval val;
1014 int ret;
1015
1016 psy = tcd->devdata;
1017 ret = power_supply_get_property(psy,
1018 POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT_MAX, &val);
1019 if (ret)
1020 return ret;
1021
1022 *state = val.intval;
1023
1024 return ret;
1025}
1026
1027static int ps_get_cur_charge_cntl_limit(struct thermal_cooling_device *tcd,
1028 unsigned long *state)
1029{
1030 struct power_supply *psy;
1031 union power_supply_propval val;
1032 int ret;
1033
1034 psy = tcd->devdata;
1035 ret = power_supply_get_property(psy,
1036 POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT, &val);
1037 if (ret)
1038 return ret;
1039
1040 *state = val.intval;
1041
1042 return ret;
1043}
1044
1045static int ps_set_cur_charge_cntl_limit(struct thermal_cooling_device *tcd,
1046 unsigned long state)
1047{
1048 struct power_supply *psy;
1049 union power_supply_propval val;
1050 int ret;
1051
1052 psy = tcd->devdata;
1053 val.intval = state;
1054 ret = psy->desc->set_property(psy,
1055 POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT, &val);
1056
1057 return ret;
1058}
1059
1060static const struct thermal_cooling_device_ops psy_tcd_ops = {
1061 .get_max_state = ps_get_max_charge_cntl_limit,
1062 .get_cur_state = ps_get_cur_charge_cntl_limit,
1063 .set_cur_state = ps_set_cur_charge_cntl_limit,
1064};
1065
1066static int psy_register_cooler(struct power_supply *psy)
1067{
1068 int i;
1069
1070
1071 for (i = 0; i < psy->desc->num_properties; i++) {
1072 if (psy->desc->properties[i] ==
1073 POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT) {
1074 psy->tcd = thermal_cooling_device_register(
1075 (char *)psy->desc->name,
1076 psy, &psy_tcd_ops);
1077 return PTR_ERR_OR_ZERO(psy->tcd);
1078 }
1079 }
1080 return 0;
1081}
1082
1083static void psy_unregister_cooler(struct power_supply *psy)
1084{
1085 if (IS_ERR_OR_NULL(psy->tcd))
1086 return;
1087 thermal_cooling_device_unregister(psy->tcd);
1088}
1089#else
1090static int psy_register_thermal(struct power_supply *psy)
1091{
1092 return 0;
1093}
1094
1095static void psy_unregister_thermal(struct power_supply *psy)
1096{
1097}
1098
1099static int psy_register_cooler(struct power_supply *psy)
1100{
1101 return 0;
1102}
1103
1104static void psy_unregister_cooler(struct power_supply *psy)
1105{
1106}
1107#endif
1108
1109static struct power_supply *__must_check
1110__power_supply_register(struct device *parent,
1111 const struct power_supply_desc *desc,
1112 const struct power_supply_config *cfg,
1113 bool ws)
1114{
1115 struct device *dev;
1116 struct power_supply *psy;
1117 int i, rc;
1118
1119 if (!parent)
1120 pr_warn("%s: Expected proper parent device for '%s'\n",
1121 __func__, desc->name);
1122
1123 if (!desc || !desc->name || !desc->properties || !desc->num_properties)
1124 return ERR_PTR(-EINVAL);
1125
1126 for (i = 0; i < desc->num_properties; ++i) {
1127 if ((desc->properties[i] == POWER_SUPPLY_PROP_USB_TYPE) &&
1128 (!desc->usb_types || !desc->num_usb_types))
1129 return ERR_PTR(-EINVAL);
1130 }
1131
1132 psy = kzalloc(sizeof(*psy), GFP_KERNEL);
1133 if (!psy)
1134 return ERR_PTR(-ENOMEM);
1135
1136 dev = &psy->dev;
1137
1138 device_initialize(dev);
1139
1140 dev->class = power_supply_class;
1141 dev->type = &power_supply_dev_type;
1142 dev->parent = parent;
1143 dev->release = power_supply_dev_release;
1144 dev_set_drvdata(dev, psy);
1145 psy->desc = desc;
1146 if (cfg) {
1147 dev->groups = cfg->attr_grp;
1148 psy->drv_data = cfg->drv_data;
1149 psy->of_node =
1150 cfg->fwnode ? to_of_node(cfg->fwnode) : cfg->of_node;
1151 psy->supplied_to = cfg->supplied_to;
1152 psy->num_supplicants = cfg->num_supplicants;
1153 }
1154
1155 rc = dev_set_name(dev, "%s", desc->name);
1156 if (rc)
1157 goto dev_set_name_failed;
1158
1159 INIT_WORK(&psy->changed_work, power_supply_changed_work);
1160 INIT_DELAYED_WORK(&psy->deferred_register_work,
1161 power_supply_deferred_register_work);
1162
1163 rc = power_supply_check_supplies(psy);
1164 if (rc) {
1165 dev_dbg(dev, "Not all required supplies found, defer probe\n");
1166 goto check_supplies_failed;
1167 }
1168
1169 spin_lock_init(&psy->changed_lock);
1170 rc = device_add(dev);
1171 if (rc)
1172 goto device_add_failed;
1173
1174 rc = device_init_wakeup(dev, ws);
1175 if (rc)
1176 goto wakeup_init_failed;
1177
1178 rc = psy_register_thermal(psy);
1179 if (rc)
1180 goto register_thermal_failed;
1181
1182 rc = psy_register_cooler(psy);
1183 if (rc)
1184 goto register_cooler_failed;
1185
1186 rc = power_supply_create_triggers(psy);
1187 if (rc)
1188 goto create_triggers_failed;
1189
1190 rc = power_supply_add_hwmon_sysfs(psy);
1191 if (rc)
1192 goto add_hwmon_sysfs_failed;
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203 atomic_inc(&psy->use_cnt);
1204 psy->initialized = true;
1205
1206 queue_delayed_work(system_power_efficient_wq,
1207 &psy->deferred_register_work,
1208 POWER_SUPPLY_DEFERRED_REGISTER_TIME);
1209
1210 return psy;
1211
1212add_hwmon_sysfs_failed:
1213 power_supply_remove_triggers(psy);
1214create_triggers_failed:
1215 psy_unregister_cooler(psy);
1216register_cooler_failed:
1217 psy_unregister_thermal(psy);
1218register_thermal_failed:
1219 device_del(dev);
1220wakeup_init_failed:
1221device_add_failed:
1222check_supplies_failed:
1223dev_set_name_failed:
1224 put_device(dev);
1225 return ERR_PTR(rc);
1226}
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242struct power_supply *__must_check power_supply_register(struct device *parent,
1243 const struct power_supply_desc *desc,
1244 const struct power_supply_config *cfg)
1245{
1246 return __power_supply_register(parent, desc, cfg, true);
1247}
1248EXPORT_SYMBOL_GPL(power_supply_register);
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264struct power_supply *__must_check
1265power_supply_register_no_ws(struct device *parent,
1266 const struct power_supply_desc *desc,
1267 const struct power_supply_config *cfg)
1268{
1269 return __power_supply_register(parent, desc, cfg, false);
1270}
1271EXPORT_SYMBOL_GPL(power_supply_register_no_ws);
1272
1273static void devm_power_supply_release(struct device *dev, void *res)
1274{
1275 struct power_supply **psy = res;
1276
1277 power_supply_unregister(*psy);
1278}
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294struct power_supply *__must_check
1295devm_power_supply_register(struct device *parent,
1296 const struct power_supply_desc *desc,
1297 const struct power_supply_config *cfg)
1298{
1299 struct power_supply **ptr, *psy;
1300
1301 ptr = devres_alloc(devm_power_supply_release, sizeof(*ptr), GFP_KERNEL);
1302
1303 if (!ptr)
1304 return ERR_PTR(-ENOMEM);
1305 psy = __power_supply_register(parent, desc, cfg, true);
1306 if (IS_ERR(psy)) {
1307 devres_free(ptr);
1308 } else {
1309 *ptr = psy;
1310 devres_add(parent, ptr);
1311 }
1312 return psy;
1313}
1314EXPORT_SYMBOL_GPL(devm_power_supply_register);
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330struct power_supply *__must_check
1331devm_power_supply_register_no_ws(struct device *parent,
1332 const struct power_supply_desc *desc,
1333 const struct power_supply_config *cfg)
1334{
1335 struct power_supply **ptr, *psy;
1336
1337 ptr = devres_alloc(devm_power_supply_release, sizeof(*ptr), GFP_KERNEL);
1338
1339 if (!ptr)
1340 return ERR_PTR(-ENOMEM);
1341 psy = __power_supply_register(parent, desc, cfg, false);
1342 if (IS_ERR(psy)) {
1343 devres_free(ptr);
1344 } else {
1345 *ptr = psy;
1346 devres_add(parent, ptr);
1347 }
1348 return psy;
1349}
1350EXPORT_SYMBOL_GPL(devm_power_supply_register_no_ws);
1351
1352
1353
1354
1355
1356
1357
1358
1359void power_supply_unregister(struct power_supply *psy)
1360{
1361 WARN_ON(atomic_dec_return(&psy->use_cnt));
1362 psy->removing = true;
1363 cancel_work_sync(&psy->changed_work);
1364 cancel_delayed_work_sync(&psy->deferred_register_work);
1365 sysfs_remove_link(&psy->dev.kobj, "powers");
1366 power_supply_remove_hwmon_sysfs(psy);
1367 power_supply_remove_triggers(psy);
1368 psy_unregister_cooler(psy);
1369 psy_unregister_thermal(psy);
1370 device_init_wakeup(&psy->dev, false);
1371 device_unregister(&psy->dev);
1372}
1373EXPORT_SYMBOL_GPL(power_supply_unregister);
1374
1375void *power_supply_get_drvdata(struct power_supply *psy)
1376{
1377 return psy->drv_data;
1378}
1379EXPORT_SYMBOL_GPL(power_supply_get_drvdata);
1380
1381static int __init power_supply_class_init(void)
1382{
1383 power_supply_class = class_create(THIS_MODULE, "power_supply");
1384
1385 if (IS_ERR(power_supply_class))
1386 return PTR_ERR(power_supply_class);
1387
1388 power_supply_class->dev_uevent = power_supply_uevent;
1389 power_supply_init_attrs(&power_supply_dev_type);
1390
1391 return 0;
1392}
1393
1394static void __exit power_supply_class_exit(void)
1395{
1396 class_destroy(power_supply_class);
1397}
1398
1399subsys_initcall(power_supply_class_init);
1400module_exit(power_supply_class_exit);
1401
1402MODULE_DESCRIPTION("Universal power supply monitor class");
1403MODULE_AUTHOR("Ian Molton <spyro@f2s.com>, "
1404 "Szabolcs Gyurko, "
1405 "Anton Vorontsov <cbou@mail.ru>");
1406MODULE_LICENSE("GPL");
1407