This source file includes following definitions.
- __power_supply_is_supplied_by
- __power_supply_changed_work
- power_supply_changed_work
- power_supply_changed
- power_supply_deferred_register_work
- __power_supply_populate_supplied_from
- power_supply_populate_supplied_from
- __power_supply_find_supply_from_node
- power_supply_find_supply_from_node
- power_supply_check_supplies
- power_supply_check_supplies
- __power_supply_am_i_supplied
- power_supply_am_i_supplied
- __power_supply_is_system_supplied
- power_supply_is_system_supplied
- __power_supply_get_supplier_max_current
- power_supply_set_input_current_limit_from_supplier
- power_supply_set_battery_charged
- power_supply_match_device_by_name
- power_supply_get_by_name
- power_supply_put
- power_supply_match_device_node
- power_supply_get_by_phandle
- devm_power_supply_put
- devm_power_supply_get_by_phandle
- power_supply_get_battery_info
- power_supply_put_battery_info
- power_supply_ocv2cap_simple
- power_supply_find_ocv2cap_table
- power_supply_batinfo_ocv2cap
- power_supply_get_property
- power_supply_set_property
- power_supply_property_is_writeable
- power_supply_external_power_changed
- power_supply_powers
- power_supply_dev_release
- power_supply_reg_notifier
- power_supply_unreg_notifier
- power_supply_read_temp
- psy_register_thermal
- psy_unregister_thermal
- ps_get_max_charge_cntl_limit
- ps_get_cur_charge_cntl_limit
- ps_set_cur_charge_cntl_limit
- psy_register_cooler
- psy_unregister_cooler
- psy_register_thermal
- psy_unregister_thermal
- psy_register_cooler
- psy_unregister_cooler
- __power_supply_register
- power_supply_register
- power_supply_register_no_ws
- devm_power_supply_release
- devm_power_supply_register
- devm_power_supply_register_no_ws
- power_supply_unregister
- power_supply_get_drvdata
- power_supply_class_init
- power_supply_class_exit
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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
27 struct class *power_supply_class;
28 EXPORT_SYMBOL_GPL(power_supply_class);
29
30 ATOMIC_NOTIFIER_HEAD(power_supply_notifier);
31 EXPORT_SYMBOL_GPL(power_supply_notifier);
32
33 static struct device_type power_supply_dev_type;
34
35 #define POWER_SUPPLY_DEFERRED_REGISTER_TIME msecs_to_jiffies(10)
36
37 static 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
63 static 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
76 static 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
114 void 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 }
126 EXPORT_SYMBOL_GPL(power_supply_changed);
127
128
129
130
131
132
133
134
135
136
137
138 static 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
158 static 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
185 static 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
197 static 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
210 static 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
230 static 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
278 static 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
306 struct psy_am_i_supplied_data {
307 struct power_supply *psy;
308 unsigned int count;
309 };
310
311 static 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
327 int 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 }
342 EXPORT_SYMBOL_GPL(power_supply_am_i_supplied);
343
344 static 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
359 int 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 }
376 EXPORT_SYMBOL_GPL(power_supply_is_system_supplied);
377
378 static 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
394 int 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 }
417 EXPORT_SYMBOL_GPL(power_supply_set_input_current_limit_from_supplier);
418
419 int 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 }
430 EXPORT_SYMBOL_GPL(power_supply_set_battery_charged);
431
432 static 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
451 struct 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 }
464 EXPORT_SYMBOL_GPL(power_supply_get_by_name);
465
466
467
468
469
470
471
472
473 void power_supply_put(struct power_supply *psy)
474 {
475 might_sleep();
476
477 atomic_dec(&psy->use_cnt);
478 put_device(&psy->dev);
479 }
480 EXPORT_SYMBOL_GPL(power_supply_put);
481
482 #ifdef CONFIG_OF
483 static 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
500 struct 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 }
523 EXPORT_SYMBOL_GPL(power_supply_get_by_phandle);
524
525 static 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
541 struct 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 }
562 EXPORT_SYMBOL_GPL(devm_power_supply_get_by_phandle);
563 #endif
564
565 int power_supply_get_battery_info(struct power_supply *psy,
566 struct power_supply_battery_info *info)
567 {
568 struct device_node *battery_np;
569 const char *value;
570 int err, len, index;
571
572 info->energy_full_design_uwh = -EINVAL;
573 info->charge_full_design_uah = -EINVAL;
574 info->voltage_min_design_uv = -EINVAL;
575 info->voltage_max_design_uv = -EINVAL;
576 info->precharge_current_ua = -EINVAL;
577 info->charge_term_current_ua = -EINVAL;
578 info->constant_charge_current_max_ua = -EINVAL;
579 info->constant_charge_voltage_max_uv = -EINVAL;
580 info->factory_internal_resistance_uohm = -EINVAL;
581
582 for (index = 0; index < POWER_SUPPLY_OCV_TEMP_MAX; index++) {
583 info->ocv_table[index] = NULL;
584 info->ocv_temp[index] = -EINVAL;
585 info->ocv_table_size[index] = -EINVAL;
586 }
587
588 if (!psy->of_node) {
589 dev_warn(&psy->dev, "%s currently only supports devicetree\n",
590 __func__);
591 return -ENXIO;
592 }
593
594 battery_np = of_parse_phandle(psy->of_node, "monitored-battery", 0);
595 if (!battery_np)
596 return -ENODEV;
597
598 err = of_property_read_string(battery_np, "compatible", &value);
599 if (err)
600 goto out_put_node;
601
602 if (strcmp("simple-battery", value)) {
603 err = -ENODEV;
604 goto out_put_node;
605 }
606
607
608
609
610
611
612 of_property_read_u32(battery_np, "energy-full-design-microwatt-hours",
613 &info->energy_full_design_uwh);
614 of_property_read_u32(battery_np, "charge-full-design-microamp-hours",
615 &info->charge_full_design_uah);
616 of_property_read_u32(battery_np, "voltage-min-design-microvolt",
617 &info->voltage_min_design_uv);
618 of_property_read_u32(battery_np, "voltage-max-design-microvolt",
619 &info->voltage_max_design_uv);
620 of_property_read_u32(battery_np, "precharge-current-microamp",
621 &info->precharge_current_ua);
622 of_property_read_u32(battery_np, "charge-term-current-microamp",
623 &info->charge_term_current_ua);
624 of_property_read_u32(battery_np, "constant-charge-current-max-microamp",
625 &info->constant_charge_current_max_ua);
626 of_property_read_u32(battery_np, "constant-charge-voltage-max-microvolt",
627 &info->constant_charge_voltage_max_uv);
628 of_property_read_u32(battery_np, "factory-internal-resistance-micro-ohms",
629 &info->factory_internal_resistance_uohm);
630
631 len = of_property_count_u32_elems(battery_np, "ocv-capacity-celsius");
632 if (len < 0 && len != -EINVAL) {
633 err = len;
634 goto out_put_node;
635 } else if (len > POWER_SUPPLY_OCV_TEMP_MAX) {
636 dev_err(&psy->dev, "Too many temperature values\n");
637 err = -EINVAL;
638 goto out_put_node;
639 } else if (len > 0) {
640 of_property_read_u32_array(battery_np, "ocv-capacity-celsius",
641 info->ocv_temp, len);
642 }
643
644 for (index = 0; index < len; index++) {
645 struct power_supply_battery_ocv_table *table;
646 char *propname;
647 const __be32 *list;
648 int i, tab_len, size;
649
650 propname = kasprintf(GFP_KERNEL, "ocv-capacity-table-%d", index);
651 list = of_get_property(battery_np, propname, &size);
652 if (!list || !size) {
653 dev_err(&psy->dev, "failed to get %s\n", propname);
654 kfree(propname);
655 power_supply_put_battery_info(psy, info);
656 err = -EINVAL;
657 goto out_put_node;
658 }
659
660 kfree(propname);
661 tab_len = size / (2 * sizeof(__be32));
662 info->ocv_table_size[index] = tab_len;
663
664 table = info->ocv_table[index] =
665 devm_kcalloc(&psy->dev, tab_len, sizeof(*table), GFP_KERNEL);
666 if (!info->ocv_table[index]) {
667 power_supply_put_battery_info(psy, info);
668 err = -ENOMEM;
669 goto out_put_node;
670 }
671
672 for (i = 0; i < tab_len; i++) {
673 table[i].ocv = be32_to_cpu(*list);
674 list++;
675 table[i].capacity = be32_to_cpu(*list);
676 list++;
677 }
678 }
679
680 out_put_node:
681 of_node_put(battery_np);
682 return err;
683 }
684 EXPORT_SYMBOL_GPL(power_supply_get_battery_info);
685
686 void power_supply_put_battery_info(struct power_supply *psy,
687 struct power_supply_battery_info *info)
688 {
689 int i;
690
691 for (i = 0; i < POWER_SUPPLY_OCV_TEMP_MAX; i++) {
692 if (info->ocv_table[i])
693 devm_kfree(&psy->dev, info->ocv_table[i]);
694 }
695 }
696 EXPORT_SYMBOL_GPL(power_supply_put_battery_info);
697
698
699
700
701
702
703
704
705
706
707
708
709
710 int power_supply_ocv2cap_simple(struct power_supply_battery_ocv_table *table,
711 int table_len, int ocv)
712 {
713 int i, cap, tmp;
714
715 for (i = 0; i < table_len; i++)
716 if (ocv > table[i].ocv)
717 break;
718
719 if (i > 0 && i < table_len) {
720 tmp = (table[i - 1].capacity - table[i].capacity) *
721 (ocv - table[i].ocv);
722 tmp /= table[i - 1].ocv - table[i].ocv;
723 cap = tmp + table[i].capacity;
724 } else if (i == 0) {
725 cap = table[0].capacity;
726 } else {
727 cap = table[table_len - 1].capacity;
728 }
729
730 return cap;
731 }
732 EXPORT_SYMBOL_GPL(power_supply_ocv2cap_simple);
733
734 struct power_supply_battery_ocv_table *
735 power_supply_find_ocv2cap_table(struct power_supply_battery_info *info,
736 int temp, int *table_len)
737 {
738 int best_temp_diff = INT_MAX, temp_diff;
739 u8 i, best_index = 0;
740
741 if (!info->ocv_table[0])
742 return NULL;
743
744 for (i = 0; i < POWER_SUPPLY_OCV_TEMP_MAX; i++) {
745 temp_diff = abs(info->ocv_temp[i] - temp);
746
747 if (temp_diff < best_temp_diff) {
748 best_temp_diff = temp_diff;
749 best_index = i;
750 }
751 }
752
753 *table_len = info->ocv_table_size[best_index];
754 return info->ocv_table[best_index];
755 }
756 EXPORT_SYMBOL_GPL(power_supply_find_ocv2cap_table);
757
758 int power_supply_batinfo_ocv2cap(struct power_supply_battery_info *info,
759 int ocv, int temp)
760 {
761 struct power_supply_battery_ocv_table *table;
762 int table_len;
763
764 table = power_supply_find_ocv2cap_table(info, temp, &table_len);
765 if (!table)
766 return -EINVAL;
767
768 return power_supply_ocv2cap_simple(table, table_len, ocv);
769 }
770 EXPORT_SYMBOL_GPL(power_supply_batinfo_ocv2cap);
771
772 int power_supply_get_property(struct power_supply *psy,
773 enum power_supply_property psp,
774 union power_supply_propval *val)
775 {
776 if (atomic_read(&psy->use_cnt) <= 0) {
777 if (!psy->initialized)
778 return -EAGAIN;
779 return -ENODEV;
780 }
781
782 return psy->desc->get_property(psy, psp, val);
783 }
784 EXPORT_SYMBOL_GPL(power_supply_get_property);
785
786 int power_supply_set_property(struct power_supply *psy,
787 enum power_supply_property psp,
788 const union power_supply_propval *val)
789 {
790 if (atomic_read(&psy->use_cnt) <= 0 || !psy->desc->set_property)
791 return -ENODEV;
792
793 return psy->desc->set_property(psy, psp, val);
794 }
795 EXPORT_SYMBOL_GPL(power_supply_set_property);
796
797 int power_supply_property_is_writeable(struct power_supply *psy,
798 enum power_supply_property psp)
799 {
800 if (atomic_read(&psy->use_cnt) <= 0 ||
801 !psy->desc->property_is_writeable)
802 return -ENODEV;
803
804 return psy->desc->property_is_writeable(psy, psp);
805 }
806 EXPORT_SYMBOL_GPL(power_supply_property_is_writeable);
807
808 void power_supply_external_power_changed(struct power_supply *psy)
809 {
810 if (atomic_read(&psy->use_cnt) <= 0 ||
811 !psy->desc->external_power_changed)
812 return;
813
814 psy->desc->external_power_changed(psy);
815 }
816 EXPORT_SYMBOL_GPL(power_supply_external_power_changed);
817
818 int power_supply_powers(struct power_supply *psy, struct device *dev)
819 {
820 return sysfs_create_link(&psy->dev.kobj, &dev->kobj, "powers");
821 }
822 EXPORT_SYMBOL_GPL(power_supply_powers);
823
824 static void power_supply_dev_release(struct device *dev)
825 {
826 struct power_supply *psy = to_power_supply(dev);
827 dev_dbg(dev, "%s\n", __func__);
828 kfree(psy);
829 }
830
831 int power_supply_reg_notifier(struct notifier_block *nb)
832 {
833 return atomic_notifier_chain_register(&power_supply_notifier, nb);
834 }
835 EXPORT_SYMBOL_GPL(power_supply_reg_notifier);
836
837 void power_supply_unreg_notifier(struct notifier_block *nb)
838 {
839 atomic_notifier_chain_unregister(&power_supply_notifier, nb);
840 }
841 EXPORT_SYMBOL_GPL(power_supply_unreg_notifier);
842
843 #ifdef CONFIG_THERMAL
844 static int power_supply_read_temp(struct thermal_zone_device *tzd,
845 int *temp)
846 {
847 struct power_supply *psy;
848 union power_supply_propval val;
849 int ret;
850
851 WARN_ON(tzd == NULL);
852 psy = tzd->devdata;
853 ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_TEMP, &val);
854 if (ret)
855 return ret;
856
857
858 *temp = val.intval * 100;
859
860 return ret;
861 }
862
863 static struct thermal_zone_device_ops psy_tzd_ops = {
864 .get_temp = power_supply_read_temp,
865 };
866
867 static int psy_register_thermal(struct power_supply *psy)
868 {
869 int i;
870
871 if (psy->desc->no_thermal)
872 return 0;
873
874
875 for (i = 0; i < psy->desc->num_properties; i++) {
876 if (psy->desc->properties[i] == POWER_SUPPLY_PROP_TEMP) {
877 psy->tzd = thermal_zone_device_register(psy->desc->name,
878 0, 0, psy, &psy_tzd_ops, NULL, 0, 0);
879 return PTR_ERR_OR_ZERO(psy->tzd);
880 }
881 }
882 return 0;
883 }
884
885 static void psy_unregister_thermal(struct power_supply *psy)
886 {
887 if (IS_ERR_OR_NULL(psy->tzd))
888 return;
889 thermal_zone_device_unregister(psy->tzd);
890 }
891
892
893 static int ps_get_max_charge_cntl_limit(struct thermal_cooling_device *tcd,
894 unsigned long *state)
895 {
896 struct power_supply *psy;
897 union power_supply_propval val;
898 int ret;
899
900 psy = tcd->devdata;
901 ret = power_supply_get_property(psy,
902 POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT_MAX, &val);
903 if (ret)
904 return ret;
905
906 *state = val.intval;
907
908 return ret;
909 }
910
911 static int ps_get_cur_charge_cntl_limit(struct thermal_cooling_device *tcd,
912 unsigned long *state)
913 {
914 struct power_supply *psy;
915 union power_supply_propval val;
916 int ret;
917
918 psy = tcd->devdata;
919 ret = power_supply_get_property(psy,
920 POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT, &val);
921 if (ret)
922 return ret;
923
924 *state = val.intval;
925
926 return ret;
927 }
928
929 static int ps_set_cur_charge_cntl_limit(struct thermal_cooling_device *tcd,
930 unsigned long state)
931 {
932 struct power_supply *psy;
933 union power_supply_propval val;
934 int ret;
935
936 psy = tcd->devdata;
937 val.intval = state;
938 ret = psy->desc->set_property(psy,
939 POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT, &val);
940
941 return ret;
942 }
943
944 static const struct thermal_cooling_device_ops psy_tcd_ops = {
945 .get_max_state = ps_get_max_charge_cntl_limit,
946 .get_cur_state = ps_get_cur_charge_cntl_limit,
947 .set_cur_state = ps_set_cur_charge_cntl_limit,
948 };
949
950 static int psy_register_cooler(struct power_supply *psy)
951 {
952 int i;
953
954
955 for (i = 0; i < psy->desc->num_properties; i++) {
956 if (psy->desc->properties[i] ==
957 POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT) {
958 psy->tcd = thermal_cooling_device_register(
959 (char *)psy->desc->name,
960 psy, &psy_tcd_ops);
961 return PTR_ERR_OR_ZERO(psy->tcd);
962 }
963 }
964 return 0;
965 }
966
967 static void psy_unregister_cooler(struct power_supply *psy)
968 {
969 if (IS_ERR_OR_NULL(psy->tcd))
970 return;
971 thermal_cooling_device_unregister(psy->tcd);
972 }
973 #else
974 static int psy_register_thermal(struct power_supply *psy)
975 {
976 return 0;
977 }
978
979 static void psy_unregister_thermal(struct power_supply *psy)
980 {
981 }
982
983 static int psy_register_cooler(struct power_supply *psy)
984 {
985 return 0;
986 }
987
988 static void psy_unregister_cooler(struct power_supply *psy)
989 {
990 }
991 #endif
992
993 static struct power_supply *__must_check
994 __power_supply_register(struct device *parent,
995 const struct power_supply_desc *desc,
996 const struct power_supply_config *cfg,
997 bool ws)
998 {
999 struct device *dev;
1000 struct power_supply *psy;
1001 int i, rc;
1002
1003 if (!parent)
1004 pr_warn("%s: Expected proper parent device for '%s'\n",
1005 __func__, desc->name);
1006
1007 if (!desc || !desc->name || !desc->properties || !desc->num_properties)
1008 return ERR_PTR(-EINVAL);
1009
1010 for (i = 0; i < desc->num_properties; ++i) {
1011 if ((desc->properties[i] == POWER_SUPPLY_PROP_USB_TYPE) &&
1012 (!desc->usb_types || !desc->num_usb_types))
1013 return ERR_PTR(-EINVAL);
1014 }
1015
1016 psy = kzalloc(sizeof(*psy), GFP_KERNEL);
1017 if (!psy)
1018 return ERR_PTR(-ENOMEM);
1019
1020 dev = &psy->dev;
1021
1022 device_initialize(dev);
1023
1024 dev->class = power_supply_class;
1025 dev->type = &power_supply_dev_type;
1026 dev->parent = parent;
1027 dev->release = power_supply_dev_release;
1028 dev_set_drvdata(dev, psy);
1029 psy->desc = desc;
1030 if (cfg) {
1031 dev->groups = cfg->attr_grp;
1032 psy->drv_data = cfg->drv_data;
1033 psy->of_node =
1034 cfg->fwnode ? to_of_node(cfg->fwnode) : cfg->of_node;
1035 psy->supplied_to = cfg->supplied_to;
1036 psy->num_supplicants = cfg->num_supplicants;
1037 }
1038
1039 rc = dev_set_name(dev, "%s", desc->name);
1040 if (rc)
1041 goto dev_set_name_failed;
1042
1043 INIT_WORK(&psy->changed_work, power_supply_changed_work);
1044 INIT_DELAYED_WORK(&psy->deferred_register_work,
1045 power_supply_deferred_register_work);
1046
1047 rc = power_supply_check_supplies(psy);
1048 if (rc) {
1049 dev_info(dev, "Not all required supplies found, defer probe\n");
1050 goto check_supplies_failed;
1051 }
1052
1053 spin_lock_init(&psy->changed_lock);
1054 rc = device_add(dev);
1055 if (rc)
1056 goto device_add_failed;
1057
1058 rc = device_init_wakeup(dev, ws);
1059 if (rc)
1060 goto wakeup_init_failed;
1061
1062 rc = psy_register_thermal(psy);
1063 if (rc)
1064 goto register_thermal_failed;
1065
1066 rc = psy_register_cooler(psy);
1067 if (rc)
1068 goto register_cooler_failed;
1069
1070 rc = power_supply_create_triggers(psy);
1071 if (rc)
1072 goto create_triggers_failed;
1073
1074 rc = power_supply_add_hwmon_sysfs(psy);
1075 if (rc)
1076 goto add_hwmon_sysfs_failed;
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087 atomic_inc(&psy->use_cnt);
1088 psy->initialized = true;
1089
1090 queue_delayed_work(system_power_efficient_wq,
1091 &psy->deferred_register_work,
1092 POWER_SUPPLY_DEFERRED_REGISTER_TIME);
1093
1094 return psy;
1095
1096 add_hwmon_sysfs_failed:
1097 power_supply_remove_triggers(psy);
1098 create_triggers_failed:
1099 psy_unregister_cooler(psy);
1100 register_cooler_failed:
1101 psy_unregister_thermal(psy);
1102 register_thermal_failed:
1103 device_del(dev);
1104 wakeup_init_failed:
1105 device_add_failed:
1106 check_supplies_failed:
1107 dev_set_name_failed:
1108 put_device(dev);
1109 return ERR_PTR(rc);
1110 }
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126 struct power_supply *__must_check power_supply_register(struct device *parent,
1127 const struct power_supply_desc *desc,
1128 const struct power_supply_config *cfg)
1129 {
1130 return __power_supply_register(parent, desc, cfg, true);
1131 }
1132 EXPORT_SYMBOL_GPL(power_supply_register);
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148 struct power_supply *__must_check
1149 power_supply_register_no_ws(struct device *parent,
1150 const struct power_supply_desc *desc,
1151 const struct power_supply_config *cfg)
1152 {
1153 return __power_supply_register(parent, desc, cfg, false);
1154 }
1155 EXPORT_SYMBOL_GPL(power_supply_register_no_ws);
1156
1157 static void devm_power_supply_release(struct device *dev, void *res)
1158 {
1159 struct power_supply **psy = res;
1160
1161 power_supply_unregister(*psy);
1162 }
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178 struct power_supply *__must_check
1179 devm_power_supply_register(struct device *parent,
1180 const struct power_supply_desc *desc,
1181 const struct power_supply_config *cfg)
1182 {
1183 struct power_supply **ptr, *psy;
1184
1185 ptr = devres_alloc(devm_power_supply_release, sizeof(*ptr), GFP_KERNEL);
1186
1187 if (!ptr)
1188 return ERR_PTR(-ENOMEM);
1189 psy = __power_supply_register(parent, desc, cfg, true);
1190 if (IS_ERR(psy)) {
1191 devres_free(ptr);
1192 } else {
1193 *ptr = psy;
1194 devres_add(parent, ptr);
1195 }
1196 return psy;
1197 }
1198 EXPORT_SYMBOL_GPL(devm_power_supply_register);
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214 struct power_supply *__must_check
1215 devm_power_supply_register_no_ws(struct device *parent,
1216 const struct power_supply_desc *desc,
1217 const struct power_supply_config *cfg)
1218 {
1219 struct power_supply **ptr, *psy;
1220
1221 ptr = devres_alloc(devm_power_supply_release, sizeof(*ptr), GFP_KERNEL);
1222
1223 if (!ptr)
1224 return ERR_PTR(-ENOMEM);
1225 psy = __power_supply_register(parent, desc, cfg, false);
1226 if (IS_ERR(psy)) {
1227 devres_free(ptr);
1228 } else {
1229 *ptr = psy;
1230 devres_add(parent, ptr);
1231 }
1232 return psy;
1233 }
1234 EXPORT_SYMBOL_GPL(devm_power_supply_register_no_ws);
1235
1236
1237
1238
1239
1240
1241
1242
1243 void power_supply_unregister(struct power_supply *psy)
1244 {
1245 WARN_ON(atomic_dec_return(&psy->use_cnt));
1246 psy->removing = true;
1247 cancel_work_sync(&psy->changed_work);
1248 cancel_delayed_work_sync(&psy->deferred_register_work);
1249 sysfs_remove_link(&psy->dev.kobj, "powers");
1250 power_supply_remove_hwmon_sysfs(psy);
1251 power_supply_remove_triggers(psy);
1252 psy_unregister_cooler(psy);
1253 psy_unregister_thermal(psy);
1254 device_init_wakeup(&psy->dev, false);
1255 device_unregister(&psy->dev);
1256 }
1257 EXPORT_SYMBOL_GPL(power_supply_unregister);
1258
1259 void *power_supply_get_drvdata(struct power_supply *psy)
1260 {
1261 return psy->drv_data;
1262 }
1263 EXPORT_SYMBOL_GPL(power_supply_get_drvdata);
1264
1265 static int __init power_supply_class_init(void)
1266 {
1267 power_supply_class = class_create(THIS_MODULE, "power_supply");
1268
1269 if (IS_ERR(power_supply_class))
1270 return PTR_ERR(power_supply_class);
1271
1272 power_supply_class->dev_uevent = power_supply_uevent;
1273 power_supply_init_attrs(&power_supply_dev_type);
1274
1275 return 0;
1276 }
1277
1278 static void __exit power_supply_class_exit(void)
1279 {
1280 class_destroy(power_supply_class);
1281 }
1282
1283 subsys_initcall(power_supply_class_init);
1284 module_exit(power_supply_class_exit);
1285
1286 MODULE_DESCRIPTION("Universal power supply monitor class");
1287 MODULE_AUTHOR("Ian Molton <spyro@f2s.com>, "
1288 "Szabolcs Gyurko, "
1289 "Anton Vorontsov <cbou@mail.ru>");
1290 MODULE_LICENSE("GPL");