1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Universal power supply monitor class
4 *
5 * Copyright © 2007 Anton Vorontsov <cbou@mail.ru>
6 * Copyright © 2004 Szabolcs Gyurko
7 * Copyright © 2003 Ian Molton <spyro@f2s.com>
8 *
9 * Modified: 2004, Oct Szabolcs Gyurko
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 <linux/fixp-arith.h>
25 #include "power_supply.h"
26 #include "samsung-sdi-battery.h"
27
28 static const struct class power_supply_class = {
29 .name = "power_supply",
30 .dev_uevent = power_supply_uevent,
31 };
32
33 static BLOCKING_NOTIFIER_HEAD(power_supply_notifier);
34
35 static const struct device_type power_supply_dev_type = {
36 .name = "power_supply",
37 .groups = power_supply_attr_groups,
38 };
39
40 #define POWER_SUPPLY_DEFERRED_REGISTER_TIME msecs_to_jiffies(10)
41
__power_supply_is_supplied_by(struct power_supply * supplier,struct power_supply * supply)42 static bool __power_supply_is_supplied_by(struct power_supply *supplier,
43 struct power_supply *supply)
44 {
45 int i;
46
47 if (!supply->supplied_from && !supplier->supplied_to)
48 return false;
49
50 /* Support both supplied_to and supplied_from modes */
51 if (supply->supplied_from) {
52 if (!supplier->desc->name)
53 return false;
54 for (i = 0; i < supply->num_supplies; i++)
55 if (!strcmp(supplier->desc->name, supply->supplied_from[i]))
56 return true;
57 } else {
58 if (!supply->desc->name)
59 return false;
60 for (i = 0; i < supplier->num_supplicants; i++)
61 if (!strcmp(supplier->supplied_to[i], supply->desc->name))
62 return true;
63 }
64
65 return false;
66 }
67
__power_supply_changed_work(struct device * dev,void * data)68 static int __power_supply_changed_work(struct device *dev, void *data)
69 {
70 struct power_supply *psy = data;
71 struct power_supply *pst = dev_get_drvdata(dev);
72
73 if (__power_supply_is_supplied_by(psy, pst)) {
74 if (pst->desc->external_power_changed)
75 pst->desc->external_power_changed(pst);
76 }
77
78 return 0;
79 }
80
power_supply_changed_work(struct work_struct * work)81 static void power_supply_changed_work(struct work_struct *work)
82 {
83 unsigned long flags;
84 struct power_supply *psy = container_of(work, struct power_supply,
85 changed_work);
86
87 dev_dbg(&psy->dev, "%s\n", __func__);
88
89 spin_lock_irqsave(&psy->changed_lock, flags);
90 /*
91 * Check 'changed' here to avoid issues due to race between
92 * power_supply_changed() and this routine. In worst case
93 * power_supply_changed() can be called again just before we take above
94 * lock. During the first call of this routine we will mark 'changed' as
95 * false and it will stay false for the next call as well.
96 */
97 if (likely(psy->changed)) {
98 psy->changed = false;
99 spin_unlock_irqrestore(&psy->changed_lock, flags);
100 power_supply_for_each_device(psy, __power_supply_changed_work);
101 power_supply_update_leds(psy);
102 blocking_notifier_call_chain(&power_supply_notifier,
103 PSY_EVENT_PROP_CHANGED, psy);
104 kobject_uevent(&psy->dev.kobj, KOBJ_CHANGE);
105 spin_lock_irqsave(&psy->changed_lock, flags);
106 }
107
108 /*
109 * Hold the wakeup_source until all events are processed.
110 * power_supply_changed() might have called again and have set 'changed'
111 * to true.
112 */
113 if (likely(!psy->changed))
114 pm_relax(&psy->dev);
115 spin_unlock_irqrestore(&psy->changed_lock, flags);
116 }
117
power_supply_for_each_device(void * data,int (* fn)(struct device * dev,void * data))118 int power_supply_for_each_device(void *data, int (*fn)(struct device *dev, void *data))
119 {
120 return class_for_each_device(&power_supply_class, NULL, data, fn);
121 }
122 EXPORT_SYMBOL_GPL(power_supply_for_each_device);
123
power_supply_changed(struct power_supply * psy)124 void power_supply_changed(struct power_supply *psy)
125 {
126 unsigned long flags;
127
128 dev_dbg(&psy->dev, "%s\n", __func__);
129
130 spin_lock_irqsave(&psy->changed_lock, flags);
131 psy->changed = true;
132 pm_stay_awake(&psy->dev);
133 spin_unlock_irqrestore(&psy->changed_lock, flags);
134 schedule_work(&psy->changed_work);
135 }
136 EXPORT_SYMBOL_GPL(power_supply_changed);
137
138 /*
139 * Notify that power supply was registered after parent finished the probing.
140 *
141 * Often power supply is registered from driver's probe function. However
142 * calling power_supply_changed() directly from power_supply_register()
143 * would lead to execution of get_property() function provided by the driver
144 * too early - before the probe ends.
145 *
146 * Avoid that by waiting on parent's mutex.
147 */
power_supply_deferred_register_work(struct work_struct * work)148 static void power_supply_deferred_register_work(struct work_struct *work)
149 {
150 struct power_supply *psy = container_of(work, struct power_supply,
151 deferred_register_work.work);
152
153 if (psy->dev.parent) {
154 while (!mutex_trylock(&psy->dev.parent->mutex)) {
155 if (psy->removing)
156 return;
157 msleep(10);
158 }
159 }
160
161 power_supply_changed(psy);
162
163 if (psy->dev.parent)
164 mutex_unlock(&psy->dev.parent->mutex);
165 }
166
167 #ifdef CONFIG_OF
__power_supply_populate_supplied_from(struct device * dev,void * data)168 static int __power_supply_populate_supplied_from(struct device *dev,
169 void *data)
170 {
171 struct power_supply *psy = data;
172 struct power_supply *epsy = dev_get_drvdata(dev);
173 struct device_node *np;
174 int i = 0;
175
176 do {
177 np = of_parse_phandle(psy->of_node, "power-supplies", i++);
178 if (!np)
179 break;
180
181 if (np == epsy->of_node) {
182 dev_dbg(&psy->dev, "%s: Found supply : %s\n",
183 psy->desc->name, epsy->desc->name);
184 psy->supplied_from[i-1] = (char *)epsy->desc->name;
185 psy->num_supplies++;
186 of_node_put(np);
187 break;
188 }
189 of_node_put(np);
190 } while (np);
191
192 return 0;
193 }
194
power_supply_populate_supplied_from(struct power_supply * psy)195 static int power_supply_populate_supplied_from(struct power_supply *psy)
196 {
197 int error;
198
199 error = power_supply_for_each_device(psy, __power_supply_populate_supplied_from);
200
201 dev_dbg(&psy->dev, "%s %d\n", __func__, error);
202
203 return error;
204 }
205
__power_supply_find_supply_from_node(struct device * dev,void * data)206 static int __power_supply_find_supply_from_node(struct device *dev,
207 void *data)
208 {
209 struct device_node *np = data;
210 struct power_supply *epsy = dev_get_drvdata(dev);
211
212 /* returning non-zero breaks out of power_supply_for_each_device loop */
213 if (epsy->of_node == np)
214 return 1;
215
216 return 0;
217 }
218
power_supply_find_supply_from_node(struct device_node * supply_node)219 static int power_supply_find_supply_from_node(struct device_node *supply_node)
220 {
221 int error;
222
223 /*
224 * power_supply_for_each_device() either returns its own errors or values
225 * returned by __power_supply_find_supply_from_node().
226 *
227 * __power_supply_find_supply_from_node() will return 0 (no match)
228 * or 1 (match).
229 *
230 * We return 0 if power_supply_for_each_device() returned 1, -EPROBE_DEFER if
231 * it returned 0, or error as returned by it.
232 */
233 error = power_supply_for_each_device(supply_node, __power_supply_find_supply_from_node);
234
235 return error ? (error == 1 ? 0 : error) : -EPROBE_DEFER;
236 }
237
power_supply_check_supplies(struct power_supply * psy)238 static int power_supply_check_supplies(struct power_supply *psy)
239 {
240 struct device_node *np;
241 int cnt = 0;
242
243 /* If there is already a list honor it */
244 if (psy->supplied_from && psy->num_supplies > 0)
245 return 0;
246
247 /* No device node found, nothing to do */
248 if (!psy->of_node)
249 return 0;
250
251 do {
252 int ret;
253
254 np = of_parse_phandle(psy->of_node, "power-supplies", cnt++);
255 if (!np)
256 break;
257
258 ret = power_supply_find_supply_from_node(np);
259 of_node_put(np);
260
261 if (ret) {
262 dev_dbg(&psy->dev, "Failed to find supply!\n");
263 return ret;
264 }
265 } while (np);
266
267 /* Missing valid "power-supplies" entries */
268 if (cnt == 1)
269 return 0;
270
271 /* All supplies found, allocate char ** array for filling */
272 psy->supplied_from = devm_kzalloc(&psy->dev, sizeof(*psy->supplied_from),
273 GFP_KERNEL);
274 if (!psy->supplied_from)
275 return -ENOMEM;
276
277 *psy->supplied_from = devm_kcalloc(&psy->dev,
278 cnt - 1, sizeof(**psy->supplied_from),
279 GFP_KERNEL);
280 if (!*psy->supplied_from)
281 return -ENOMEM;
282
283 return power_supply_populate_supplied_from(psy);
284 }
285 #else
power_supply_check_supplies(struct power_supply * psy)286 static int power_supply_check_supplies(struct power_supply *psy)
287 {
288 int nval, ret;
289
290 if (!psy->dev.parent)
291 return 0;
292
293 nval = device_property_string_array_count(psy->dev.parent, "supplied-from");
294 if (nval <= 0)
295 return 0;
296
297 psy->supplied_from = devm_kmalloc_array(&psy->dev, nval,
298 sizeof(char *), GFP_KERNEL);
299 if (!psy->supplied_from)
300 return -ENOMEM;
301
302 ret = device_property_read_string_array(psy->dev.parent,
303 "supplied-from", (const char **)psy->supplied_from, nval);
304 if (ret < 0)
305 return ret;
306
307 psy->num_supplies = nval;
308
309 return 0;
310 }
311 #endif
312
313 struct psy_am_i_supplied_data {
314 struct power_supply *psy;
315 unsigned int count;
316 };
317
__power_supply_am_i_supplied(struct device * dev,void * _data)318 static int __power_supply_am_i_supplied(struct device *dev, void *_data)
319 {
320 union power_supply_propval ret = {0,};
321 struct power_supply *epsy = dev_get_drvdata(dev);
322 struct psy_am_i_supplied_data *data = _data;
323
324 if (__power_supply_is_supplied_by(epsy, data->psy)) {
325 data->count++;
326 if (!epsy->desc->get_property(epsy, POWER_SUPPLY_PROP_ONLINE,
327 &ret))
328 return ret.intval;
329 }
330
331 return 0;
332 }
333
power_supply_am_i_supplied(struct power_supply * psy)334 int power_supply_am_i_supplied(struct power_supply *psy)
335 {
336 struct psy_am_i_supplied_data data = { psy, 0 };
337 int error;
338
339 error = power_supply_for_each_device(&data, __power_supply_am_i_supplied);
340
341 dev_dbg(&psy->dev, "%s count %u err %d\n", __func__, data.count, error);
342
343 if (data.count == 0)
344 return -ENODEV;
345
346 return error;
347 }
348 EXPORT_SYMBOL_GPL(power_supply_am_i_supplied);
349
__power_supply_is_system_supplied(struct device * dev,void * data)350 static int __power_supply_is_system_supplied(struct device *dev, void *data)
351 {
352 union power_supply_propval ret = {0,};
353 struct power_supply *psy = dev_get_drvdata(dev);
354 unsigned int *count = data;
355
356 if (!psy->desc->get_property(psy, POWER_SUPPLY_PROP_SCOPE, &ret))
357 if (ret.intval == POWER_SUPPLY_SCOPE_DEVICE)
358 return 0;
359
360 (*count)++;
361 if (psy->desc->type != POWER_SUPPLY_TYPE_BATTERY)
362 if (!psy->desc->get_property(psy, POWER_SUPPLY_PROP_ONLINE,
363 &ret))
364 return ret.intval;
365
366 return 0;
367 }
368
power_supply_is_system_supplied(void)369 int power_supply_is_system_supplied(void)
370 {
371 int error;
372 unsigned int count = 0;
373
374 error = power_supply_for_each_device(&count, __power_supply_is_system_supplied);
375
376 /*
377 * If no system scope power class device was found at all, most probably we
378 * are running on a desktop system, so assume we are on mains power.
379 */
380 if (count == 0)
381 return 1;
382
383 return error;
384 }
385 EXPORT_SYMBOL_GPL(power_supply_is_system_supplied);
386
387 struct psy_get_supplier_prop_data {
388 struct power_supply *psy;
389 enum power_supply_property psp;
390 union power_supply_propval *val;
391 };
392
__power_supply_get_supplier_property(struct device * dev,void * _data)393 static int __power_supply_get_supplier_property(struct device *dev, void *_data)
394 {
395 struct power_supply *epsy = dev_get_drvdata(dev);
396 struct psy_get_supplier_prop_data *data = _data;
397
398 if (__power_supply_is_supplied_by(epsy, data->psy))
399 if (!power_supply_get_property(epsy, data->psp, data->val))
400 return 1; /* Success */
401
402 return 0; /* Continue iterating */
403 }
404
power_supply_get_property_from_supplier(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)405 int power_supply_get_property_from_supplier(struct power_supply *psy,
406 enum power_supply_property psp,
407 union power_supply_propval *val)
408 {
409 struct psy_get_supplier_prop_data data = {
410 .psy = psy,
411 .psp = psp,
412 .val = val,
413 };
414 int ret;
415
416 /*
417 * This function is not intended for use with a supply with multiple
418 * suppliers, we simply pick the first supply to report the psp.
419 */
420 ret = power_supply_for_each_device(&data, __power_supply_get_supplier_property);
421 if (ret < 0)
422 return ret;
423 if (ret == 0)
424 return -ENODEV;
425
426 return 0;
427 }
428 EXPORT_SYMBOL_GPL(power_supply_get_property_from_supplier);
429
power_supply_set_battery_charged(struct power_supply * psy)430 int power_supply_set_battery_charged(struct power_supply *psy)
431 {
432 if (atomic_read(&psy->use_cnt) >= 0 &&
433 psy->desc->type == POWER_SUPPLY_TYPE_BATTERY &&
434 psy->desc->set_charged) {
435 psy->desc->set_charged(psy);
436 return 0;
437 }
438
439 return -EINVAL;
440 }
441 EXPORT_SYMBOL_GPL(power_supply_set_battery_charged);
442
power_supply_match_device_by_name(struct device * dev,const void * data)443 static int power_supply_match_device_by_name(struct device *dev, const void *data)
444 {
445 const char *name = data;
446 struct power_supply *psy = dev_get_drvdata(dev);
447
448 return strcmp(psy->desc->name, name) == 0;
449 }
450
451 /**
452 * power_supply_get_by_name() - Search for a power supply and returns its ref
453 * @name: Power supply name to fetch
454 *
455 * If power supply was found, it increases reference count for the
456 * internal power supply's device. The user should power_supply_put()
457 * after usage.
458 *
459 * Return: On success returns a reference to a power supply with
460 * matching name equals to @name, a NULL otherwise.
461 */
power_supply_get_by_name(const char * name)462 struct power_supply *power_supply_get_by_name(const char *name)
463 {
464 struct power_supply *psy = NULL;
465 struct device *dev = class_find_device(&power_supply_class, NULL, name,
466 power_supply_match_device_by_name);
467
468 if (dev) {
469 psy = dev_get_drvdata(dev);
470 atomic_inc(&psy->use_cnt);
471 }
472
473 return psy;
474 }
475 EXPORT_SYMBOL_GPL(power_supply_get_by_name);
476
477 /**
478 * power_supply_put() - Drop reference obtained with power_supply_get_by_name
479 * @psy: Reference to put
480 *
481 * The reference to power supply should be put before unregistering
482 * the power supply.
483 */
power_supply_put(struct power_supply * psy)484 void power_supply_put(struct power_supply *psy)
485 {
486 might_sleep();
487
488 atomic_dec(&psy->use_cnt);
489 put_device(&psy->dev);
490 }
491 EXPORT_SYMBOL_GPL(power_supply_put);
492
493 #ifdef CONFIG_OF
power_supply_match_device_node(struct device * dev,const void * data)494 static int power_supply_match_device_node(struct device *dev, const void *data)
495 {
496 return dev->parent && dev->parent->of_node == data;
497 }
498
499 /**
500 * power_supply_get_by_phandle() - Search for a power supply and returns its ref
501 * @np: Pointer to device node holding phandle property
502 * @property: Name of property holding a power supply name
503 *
504 * If power supply was found, it increases reference count for the
505 * internal power supply's device. The user should power_supply_put()
506 * after usage.
507 *
508 * Return: On success returns a reference to a power supply with
509 * matching name equals to value under @property, NULL or ERR_PTR otherwise.
510 */
power_supply_get_by_phandle(struct device_node * np,const char * property)511 struct power_supply *power_supply_get_by_phandle(struct device_node *np,
512 const char *property)
513 {
514 struct device_node *power_supply_np;
515 struct power_supply *psy = NULL;
516 struct device *dev;
517
518 power_supply_np = of_parse_phandle(np, property, 0);
519 if (!power_supply_np)
520 return ERR_PTR(-ENODEV);
521
522 dev = class_find_device(&power_supply_class, NULL, power_supply_np,
523 power_supply_match_device_node);
524
525 of_node_put(power_supply_np);
526
527 if (dev) {
528 psy = dev_get_drvdata(dev);
529 atomic_inc(&psy->use_cnt);
530 }
531
532 return psy;
533 }
534 EXPORT_SYMBOL_GPL(power_supply_get_by_phandle);
535
devm_power_supply_put(struct device * dev,void * res)536 static void devm_power_supply_put(struct device *dev, void *res)
537 {
538 struct power_supply **psy = res;
539
540 power_supply_put(*psy);
541 }
542
543 /**
544 * devm_power_supply_get_by_phandle() - Resource managed version of
545 * power_supply_get_by_phandle()
546 * @dev: Pointer to device holding phandle property
547 * @property: Name of property holding a power supply phandle
548 *
549 * Return: On success returns a reference to a power supply with
550 * matching name equals to value under @property, NULL or ERR_PTR otherwise.
551 */
devm_power_supply_get_by_phandle(struct device * dev,const char * property)552 struct power_supply *devm_power_supply_get_by_phandle(struct device *dev,
553 const char *property)
554 {
555 struct power_supply **ptr, *psy;
556
557 if (!dev->of_node)
558 return ERR_PTR(-ENODEV);
559
560 ptr = devres_alloc(devm_power_supply_put, sizeof(*ptr), GFP_KERNEL);
561 if (!ptr)
562 return ERR_PTR(-ENOMEM);
563
564 psy = power_supply_get_by_phandle(dev->of_node, property);
565 if (IS_ERR_OR_NULL(psy)) {
566 devres_free(ptr);
567 } else {
568 *ptr = psy;
569 devres_add(dev, ptr);
570 }
571 return psy;
572 }
573 EXPORT_SYMBOL_GPL(devm_power_supply_get_by_phandle);
574 #endif /* CONFIG_OF */
575
power_supply_get_battery_info(struct power_supply * psy,struct power_supply_battery_info ** info_out)576 int power_supply_get_battery_info(struct power_supply *psy,
577 struct power_supply_battery_info **info_out)
578 {
579 struct power_supply_resistance_temp_table *resist_table;
580 struct power_supply_battery_info *info;
581 struct device_node *battery_np = NULL;
582 struct fwnode_reference_args args;
583 struct fwnode_handle *fwnode = NULL;
584 const char *value;
585 int err, len, index;
586 const __be32 *list;
587 u32 min_max[2];
588
589 if (psy->of_node) {
590 battery_np = of_parse_phandle(psy->of_node, "monitored-battery", 0);
591 if (!battery_np)
592 return -ENODEV;
593
594 fwnode = fwnode_handle_get(of_fwnode_handle(battery_np));
595 } else if (psy->dev.parent) {
596 err = fwnode_property_get_reference_args(
597 dev_fwnode(psy->dev.parent),
598 "monitored-battery", NULL, 0, 0, &args);
599 if (err)
600 return err;
601
602 fwnode = args.fwnode;
603 }
604
605 if (!fwnode)
606 return -ENOENT;
607
608 err = fwnode_property_read_string(fwnode, "compatible", &value);
609 if (err)
610 goto out_put_node;
611
612
613 /* Try static batteries first */
614 err = samsung_sdi_battery_get_info(&psy->dev, value, &info);
615 if (!err)
616 goto out_ret_pointer;
617 else if (err == -ENODEV)
618 /*
619 * Device does not have a static battery.
620 * Proceed to look for a simple battery.
621 */
622 err = 0;
623
624 if (strcmp("simple-battery", value)) {
625 err = -ENODEV;
626 goto out_put_node;
627 }
628
629 info = devm_kzalloc(&psy->dev, sizeof(*info), GFP_KERNEL);
630 if (!info) {
631 err = -ENOMEM;
632 goto out_put_node;
633 }
634
635 info->technology = POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
636 info->energy_full_design_uwh = -EINVAL;
637 info->charge_full_design_uah = -EINVAL;
638 info->voltage_min_design_uv = -EINVAL;
639 info->voltage_max_design_uv = -EINVAL;
640 info->precharge_current_ua = -EINVAL;
641 info->charge_term_current_ua = -EINVAL;
642 info->constant_charge_current_max_ua = -EINVAL;
643 info->constant_charge_voltage_max_uv = -EINVAL;
644 info->tricklecharge_current_ua = -EINVAL;
645 info->precharge_voltage_max_uv = -EINVAL;
646 info->charge_restart_voltage_uv = -EINVAL;
647 info->overvoltage_limit_uv = -EINVAL;
648 info->maintenance_charge = NULL;
649 info->alert_low_temp_charge_current_ua = -EINVAL;
650 info->alert_low_temp_charge_voltage_uv = -EINVAL;
651 info->alert_high_temp_charge_current_ua = -EINVAL;
652 info->alert_high_temp_charge_voltage_uv = -EINVAL;
653 info->temp_ambient_alert_min = INT_MIN;
654 info->temp_ambient_alert_max = INT_MAX;
655 info->temp_alert_min = INT_MIN;
656 info->temp_alert_max = INT_MAX;
657 info->temp_min = INT_MIN;
658 info->temp_max = INT_MAX;
659 info->factory_internal_resistance_uohm = -EINVAL;
660 info->resist_table = NULL;
661 info->bti_resistance_ohm = -EINVAL;
662 info->bti_resistance_tolerance = -EINVAL;
663
664 for (index = 0; index < POWER_SUPPLY_OCV_TEMP_MAX; index++) {
665 info->ocv_table[index] = NULL;
666 info->ocv_temp[index] = -EINVAL;
667 info->ocv_table_size[index] = -EINVAL;
668 }
669
670 /* The property and field names below must correspond to elements
671 * in enum power_supply_property. For reasoning, see
672 * Documentation/power/power_supply_class.rst.
673 */
674
675 if (!fwnode_property_read_string(fwnode, "device-chemistry", &value)) {
676 if (!strcmp("nickel-cadmium", value))
677 info->technology = POWER_SUPPLY_TECHNOLOGY_NiCd;
678 else if (!strcmp("nickel-metal-hydride", value))
679 info->technology = POWER_SUPPLY_TECHNOLOGY_NiMH;
680 else if (!strcmp("lithium-ion", value))
681 /* Imprecise lithium-ion type */
682 info->technology = POWER_SUPPLY_TECHNOLOGY_LION;
683 else if (!strcmp("lithium-ion-polymer", value))
684 info->technology = POWER_SUPPLY_TECHNOLOGY_LIPO;
685 else if (!strcmp("lithium-ion-iron-phosphate", value))
686 info->technology = POWER_SUPPLY_TECHNOLOGY_LiFe;
687 else if (!strcmp("lithium-ion-manganese-oxide", value))
688 info->technology = POWER_SUPPLY_TECHNOLOGY_LiMn;
689 else
690 dev_warn(&psy->dev, "%s unknown battery type\n", value);
691 }
692
693 fwnode_property_read_u32(fwnode, "energy-full-design-microwatt-hours",
694 &info->energy_full_design_uwh);
695 fwnode_property_read_u32(fwnode, "charge-full-design-microamp-hours",
696 &info->charge_full_design_uah);
697 fwnode_property_read_u32(fwnode, "voltage-min-design-microvolt",
698 &info->voltage_min_design_uv);
699 fwnode_property_read_u32(fwnode, "voltage-max-design-microvolt",
700 &info->voltage_max_design_uv);
701 fwnode_property_read_u32(fwnode, "trickle-charge-current-microamp",
702 &info->tricklecharge_current_ua);
703 fwnode_property_read_u32(fwnode, "precharge-current-microamp",
704 &info->precharge_current_ua);
705 fwnode_property_read_u32(fwnode, "precharge-upper-limit-microvolt",
706 &info->precharge_voltage_max_uv);
707 fwnode_property_read_u32(fwnode, "charge-term-current-microamp",
708 &info->charge_term_current_ua);
709 fwnode_property_read_u32(fwnode, "re-charge-voltage-microvolt",
710 &info->charge_restart_voltage_uv);
711 fwnode_property_read_u32(fwnode, "over-voltage-threshold-microvolt",
712 &info->overvoltage_limit_uv);
713 fwnode_property_read_u32(fwnode, "constant-charge-current-max-microamp",
714 &info->constant_charge_current_max_ua);
715 fwnode_property_read_u32(fwnode, "constant-charge-voltage-max-microvolt",
716 &info->constant_charge_voltage_max_uv);
717 fwnode_property_read_u32(fwnode, "factory-internal-resistance-micro-ohms",
718 &info->factory_internal_resistance_uohm);
719
720 if (!fwnode_property_read_u32_array(fwnode, "ambient-celsius",
721 min_max, ARRAY_SIZE(min_max))) {
722 info->temp_ambient_alert_min = min_max[0];
723 info->temp_ambient_alert_max = min_max[1];
724 }
725 if (!fwnode_property_read_u32_array(fwnode, "alert-celsius",
726 min_max, ARRAY_SIZE(min_max))) {
727 info->temp_alert_min = min_max[0];
728 info->temp_alert_max = min_max[1];
729 }
730 if (!fwnode_property_read_u32_array(fwnode, "operating-range-celsius",
731 min_max, ARRAY_SIZE(min_max))) {
732 info->temp_min = min_max[0];
733 info->temp_max = min_max[1];
734 }
735
736 /*
737 * The below code uses raw of-data parsing to parse
738 * /schemas/types.yaml#/definitions/uint32-matrix
739 * data, so for now this is only support with of.
740 */
741 if (!battery_np)
742 goto out_ret_pointer;
743
744 len = of_property_count_u32_elems(battery_np, "ocv-capacity-celsius");
745 if (len < 0 && len != -EINVAL) {
746 err = len;
747 goto out_put_node;
748 } else if (len > POWER_SUPPLY_OCV_TEMP_MAX) {
749 dev_err(&psy->dev, "Too many temperature values\n");
750 err = -EINVAL;
751 goto out_put_node;
752 } else if (len > 0) {
753 of_property_read_u32_array(battery_np, "ocv-capacity-celsius",
754 info->ocv_temp, len);
755 }
756
757 for (index = 0; index < len; index++) {
758 struct power_supply_battery_ocv_table *table;
759 char *propname;
760 int i, tab_len, size;
761
762 propname = kasprintf(GFP_KERNEL, "ocv-capacity-table-%d", index);
763 if (!propname) {
764 power_supply_put_battery_info(psy, info);
765 err = -ENOMEM;
766 goto out_put_node;
767 }
768 list = of_get_property(battery_np, propname, &size);
769 if (!list || !size) {
770 dev_err(&psy->dev, "failed to get %s\n", propname);
771 kfree(propname);
772 power_supply_put_battery_info(psy, info);
773 err = -EINVAL;
774 goto out_put_node;
775 }
776
777 kfree(propname);
778 tab_len = size / (2 * sizeof(__be32));
779 info->ocv_table_size[index] = tab_len;
780
781 table = info->ocv_table[index] =
782 devm_kcalloc(&psy->dev, tab_len, sizeof(*table), GFP_KERNEL);
783 if (!info->ocv_table[index]) {
784 power_supply_put_battery_info(psy, info);
785 err = -ENOMEM;
786 goto out_put_node;
787 }
788
789 for (i = 0; i < tab_len; i++) {
790 table[i].ocv = be32_to_cpu(*list);
791 list++;
792 table[i].capacity = be32_to_cpu(*list);
793 list++;
794 }
795 }
796
797 list = of_get_property(battery_np, "resistance-temp-table", &len);
798 if (!list || !len)
799 goto out_ret_pointer;
800
801 info->resist_table_size = len / (2 * sizeof(__be32));
802 resist_table = info->resist_table = devm_kcalloc(&psy->dev,
803 info->resist_table_size,
804 sizeof(*resist_table),
805 GFP_KERNEL);
806 if (!info->resist_table) {
807 power_supply_put_battery_info(psy, info);
808 err = -ENOMEM;
809 goto out_put_node;
810 }
811
812 for (index = 0; index < info->resist_table_size; index++) {
813 resist_table[index].temp = be32_to_cpu(*list++);
814 resist_table[index].resistance = be32_to_cpu(*list++);
815 }
816
817 out_ret_pointer:
818 /* Finally return the whole thing */
819 *info_out = info;
820
821 out_put_node:
822 fwnode_handle_put(fwnode);
823 of_node_put(battery_np);
824 return err;
825 }
826 EXPORT_SYMBOL_GPL(power_supply_get_battery_info);
827
power_supply_put_battery_info(struct power_supply * psy,struct power_supply_battery_info * info)828 void power_supply_put_battery_info(struct power_supply *psy,
829 struct power_supply_battery_info *info)
830 {
831 int i;
832
833 for (i = 0; i < POWER_SUPPLY_OCV_TEMP_MAX; i++) {
834 if (info->ocv_table[i])
835 devm_kfree(&psy->dev, info->ocv_table[i]);
836 }
837
838 if (info->resist_table)
839 devm_kfree(&psy->dev, info->resist_table);
840
841 devm_kfree(&psy->dev, info);
842 }
843 EXPORT_SYMBOL_GPL(power_supply_put_battery_info);
844
845 const enum power_supply_property power_supply_battery_info_properties[] = {
846 POWER_SUPPLY_PROP_TECHNOLOGY,
847 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
848 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
849 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
850 POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
851 POWER_SUPPLY_PROP_PRECHARGE_CURRENT,
852 POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT,
853 POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
854 POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
855 POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MIN,
856 POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MAX,
857 POWER_SUPPLY_PROP_TEMP_ALERT_MIN,
858 POWER_SUPPLY_PROP_TEMP_ALERT_MAX,
859 POWER_SUPPLY_PROP_TEMP_MIN,
860 POWER_SUPPLY_PROP_TEMP_MAX,
861 };
862 EXPORT_SYMBOL_GPL(power_supply_battery_info_properties);
863
864 const size_t power_supply_battery_info_properties_size = ARRAY_SIZE(power_supply_battery_info_properties);
865 EXPORT_SYMBOL_GPL(power_supply_battery_info_properties_size);
866
power_supply_battery_info_has_prop(struct power_supply_battery_info * info,enum power_supply_property psp)867 bool power_supply_battery_info_has_prop(struct power_supply_battery_info *info,
868 enum power_supply_property psp)
869 {
870 if (!info)
871 return false;
872
873 switch (psp) {
874 case POWER_SUPPLY_PROP_TECHNOLOGY:
875 return info->technology != POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
876 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
877 return info->energy_full_design_uwh >= 0;
878 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
879 return info->charge_full_design_uah >= 0;
880 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
881 return info->voltage_min_design_uv >= 0;
882 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
883 return info->voltage_max_design_uv >= 0;
884 case POWER_SUPPLY_PROP_PRECHARGE_CURRENT:
885 return info->precharge_current_ua >= 0;
886 case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
887 return info->charge_term_current_ua >= 0;
888 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
889 return info->constant_charge_current_max_ua >= 0;
890 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
891 return info->constant_charge_voltage_max_uv >= 0;
892 case POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MIN:
893 return info->temp_ambient_alert_min > INT_MIN;
894 case POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MAX:
895 return info->temp_ambient_alert_max < INT_MAX;
896 case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
897 return info->temp_alert_min > INT_MIN;
898 case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
899 return info->temp_alert_max < INT_MAX;
900 case POWER_SUPPLY_PROP_TEMP_MIN:
901 return info->temp_min > INT_MIN;
902 case POWER_SUPPLY_PROP_TEMP_MAX:
903 return info->temp_max < INT_MAX;
904 default:
905 return false;
906 }
907 }
908 EXPORT_SYMBOL_GPL(power_supply_battery_info_has_prop);
909
power_supply_battery_info_get_prop(struct power_supply_battery_info * info,enum power_supply_property psp,union power_supply_propval * val)910 int power_supply_battery_info_get_prop(struct power_supply_battery_info *info,
911 enum power_supply_property psp,
912 union power_supply_propval *val)
913 {
914 if (!info)
915 return -EINVAL;
916
917 if (!power_supply_battery_info_has_prop(info, psp))
918 return -EINVAL;
919
920 switch (psp) {
921 case POWER_SUPPLY_PROP_TECHNOLOGY:
922 val->intval = info->technology;
923 return 0;
924 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
925 val->intval = info->energy_full_design_uwh;
926 return 0;
927 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
928 val->intval = info->charge_full_design_uah;
929 return 0;
930 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
931 val->intval = info->voltage_min_design_uv;
932 return 0;
933 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
934 val->intval = info->voltage_max_design_uv;
935 return 0;
936 case POWER_SUPPLY_PROP_PRECHARGE_CURRENT:
937 val->intval = info->precharge_current_ua;
938 return 0;
939 case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
940 val->intval = info->charge_term_current_ua;
941 return 0;
942 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
943 val->intval = info->constant_charge_current_max_ua;
944 return 0;
945 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
946 val->intval = info->constant_charge_voltage_max_uv;
947 return 0;
948 case POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MIN:
949 val->intval = info->temp_ambient_alert_min;
950 return 0;
951 case POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MAX:
952 val->intval = info->temp_ambient_alert_max;
953 return 0;
954 case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
955 val->intval = info->temp_alert_min;
956 return 0;
957 case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
958 val->intval = info->temp_alert_max;
959 return 0;
960 case POWER_SUPPLY_PROP_TEMP_MIN:
961 val->intval = info->temp_min;
962 return 0;
963 case POWER_SUPPLY_PROP_TEMP_MAX:
964 val->intval = info->temp_max;
965 return 0;
966 default:
967 return -EINVAL;
968 }
969 }
970 EXPORT_SYMBOL_GPL(power_supply_battery_info_get_prop);
971
972 /**
973 * power_supply_temp2resist_simple() - find the battery internal resistance
974 * percent from temperature
975 * @table: Pointer to battery resistance temperature table
976 * @table_len: The table length
977 * @temp: Current temperature
978 *
979 * This helper function is used to look up battery internal resistance percent
980 * according to current temperature value from the resistance temperature table,
981 * and the table must be ordered descending. Then the actual battery internal
982 * resistance = the ideal battery internal resistance * percent / 100.
983 *
984 * Return: the battery internal resistance percent
985 */
power_supply_temp2resist_simple(struct power_supply_resistance_temp_table * table,int table_len,int temp)986 int power_supply_temp2resist_simple(struct power_supply_resistance_temp_table *table,
987 int table_len, int temp)
988 {
989 int i, high, low;
990
991 for (i = 0; i < table_len; i++)
992 if (temp > table[i].temp)
993 break;
994
995 /* The library function will deal with high == low */
996 if (i == 0)
997 high = low = i;
998 else if (i == table_len)
999 high = low = i - 1;
1000 else
1001 high = (low = i) - 1;
1002
1003 return fixp_linear_interpolate(table[low].temp,
1004 table[low].resistance,
1005 table[high].temp,
1006 table[high].resistance,
1007 temp);
1008 }
1009 EXPORT_SYMBOL_GPL(power_supply_temp2resist_simple);
1010
1011 /**
1012 * power_supply_vbat2ri() - find the battery internal resistance
1013 * from the battery voltage
1014 * @info: The battery information container
1015 * @vbat_uv: The battery voltage in microvolt
1016 * @charging: If we are charging (true) or not (false)
1017 *
1018 * This helper function is used to look up battery internal resistance
1019 * according to current battery voltage. Depending on whether the battery
1020 * is currently charging or not, different resistance will be returned.
1021 *
1022 * Returns the internal resistance in microohm or negative error code.
1023 */
power_supply_vbat2ri(struct power_supply_battery_info * info,int vbat_uv,bool charging)1024 int power_supply_vbat2ri(struct power_supply_battery_info *info,
1025 int vbat_uv, bool charging)
1026 {
1027 struct power_supply_vbat_ri_table *vbat2ri;
1028 int table_len;
1029 int i, high, low;
1030
1031 /*
1032 * If we are charging, and the battery supplies a separate table
1033 * for this state, we use that in order to compensate for the
1034 * charging voltage. Otherwise we use the main table.
1035 */
1036 if (charging && info->vbat2ri_charging) {
1037 vbat2ri = info->vbat2ri_charging;
1038 table_len = info->vbat2ri_charging_size;
1039 } else {
1040 vbat2ri = info->vbat2ri_discharging;
1041 table_len = info->vbat2ri_discharging_size;
1042 }
1043
1044 /*
1045 * If no tables are specified, or if we are above the highest voltage in
1046 * the voltage table, just return the factory specified internal resistance.
1047 */
1048 if (!vbat2ri || (table_len <= 0) || (vbat_uv > vbat2ri[0].vbat_uv)) {
1049 if (charging && (info->factory_internal_resistance_charging_uohm > 0))
1050 return info->factory_internal_resistance_charging_uohm;
1051 else
1052 return info->factory_internal_resistance_uohm;
1053 }
1054
1055 /* Break loop at table_len - 1 because that is the highest index */
1056 for (i = 0; i < table_len - 1; i++)
1057 if (vbat_uv > vbat2ri[i].vbat_uv)
1058 break;
1059
1060 /* The library function will deal with high == low */
1061 if ((i == 0) || (i == (table_len - 1)))
1062 high = i;
1063 else
1064 high = i - 1;
1065 low = i;
1066
1067 return fixp_linear_interpolate(vbat2ri[low].vbat_uv,
1068 vbat2ri[low].ri_uohm,
1069 vbat2ri[high].vbat_uv,
1070 vbat2ri[high].ri_uohm,
1071 vbat_uv);
1072 }
1073 EXPORT_SYMBOL_GPL(power_supply_vbat2ri);
1074
1075 struct power_supply_maintenance_charge_table *
power_supply_get_maintenance_charging_setting(struct power_supply_battery_info * info,int index)1076 power_supply_get_maintenance_charging_setting(struct power_supply_battery_info *info,
1077 int index)
1078 {
1079 if (index >= info->maintenance_charge_size)
1080 return NULL;
1081 return &info->maintenance_charge[index];
1082 }
1083 EXPORT_SYMBOL_GPL(power_supply_get_maintenance_charging_setting);
1084
1085 /**
1086 * power_supply_ocv2cap_simple() - find the battery capacity
1087 * @table: Pointer to battery OCV lookup table
1088 * @table_len: OCV table length
1089 * @ocv: Current OCV value
1090 *
1091 * This helper function is used to look up battery capacity according to
1092 * current OCV value from one OCV table, and the OCV table must be ordered
1093 * descending.
1094 *
1095 * Return: the battery capacity.
1096 */
power_supply_ocv2cap_simple(struct power_supply_battery_ocv_table * table,int table_len,int ocv)1097 int power_supply_ocv2cap_simple(struct power_supply_battery_ocv_table *table,
1098 int table_len, int ocv)
1099 {
1100 int i, high, low;
1101
1102 for (i = 0; i < table_len; i++)
1103 if (ocv > table[i].ocv)
1104 break;
1105
1106 /* The library function will deal with high == low */
1107 if (i == 0)
1108 high = low = i;
1109 else if (i == table_len)
1110 high = low = i - 1;
1111 else
1112 high = (low = i) - 1;
1113
1114 return fixp_linear_interpolate(table[low].ocv,
1115 table[low].capacity,
1116 table[high].ocv,
1117 table[high].capacity,
1118 ocv);
1119 }
1120 EXPORT_SYMBOL_GPL(power_supply_ocv2cap_simple);
1121
1122 struct power_supply_battery_ocv_table *
power_supply_find_ocv2cap_table(struct power_supply_battery_info * info,int temp,int * table_len)1123 power_supply_find_ocv2cap_table(struct power_supply_battery_info *info,
1124 int temp, int *table_len)
1125 {
1126 int best_temp_diff = INT_MAX, temp_diff;
1127 u8 i, best_index = 0;
1128
1129 if (!info->ocv_table[0])
1130 return NULL;
1131
1132 for (i = 0; i < POWER_SUPPLY_OCV_TEMP_MAX; i++) {
1133 /* Out of capacity tables */
1134 if (!info->ocv_table[i])
1135 break;
1136
1137 temp_diff = abs(info->ocv_temp[i] - temp);
1138
1139 if (temp_diff < best_temp_diff) {
1140 best_temp_diff = temp_diff;
1141 best_index = i;
1142 }
1143 }
1144
1145 *table_len = info->ocv_table_size[best_index];
1146 return info->ocv_table[best_index];
1147 }
1148 EXPORT_SYMBOL_GPL(power_supply_find_ocv2cap_table);
1149
power_supply_batinfo_ocv2cap(struct power_supply_battery_info * info,int ocv,int temp)1150 int power_supply_batinfo_ocv2cap(struct power_supply_battery_info *info,
1151 int ocv, int temp)
1152 {
1153 struct power_supply_battery_ocv_table *table;
1154 int table_len;
1155
1156 table = power_supply_find_ocv2cap_table(info, temp, &table_len);
1157 if (!table)
1158 return -EINVAL;
1159
1160 return power_supply_ocv2cap_simple(table, table_len, ocv);
1161 }
1162 EXPORT_SYMBOL_GPL(power_supply_batinfo_ocv2cap);
1163
power_supply_battery_bti_in_range(struct power_supply_battery_info * info,int resistance)1164 bool power_supply_battery_bti_in_range(struct power_supply_battery_info *info,
1165 int resistance)
1166 {
1167 int low, high;
1168
1169 /* Nothing like this can be checked */
1170 if (info->bti_resistance_ohm <= 0)
1171 return false;
1172
1173 /* This will be extremely strict and unlikely to work */
1174 if (info->bti_resistance_tolerance <= 0)
1175 return (info->bti_resistance_ohm == resistance);
1176
1177 low = info->bti_resistance_ohm -
1178 (info->bti_resistance_ohm * info->bti_resistance_tolerance) / 100;
1179 high = info->bti_resistance_ohm +
1180 (info->bti_resistance_ohm * info->bti_resistance_tolerance) / 100;
1181
1182 return ((resistance >= low) && (resistance <= high));
1183 }
1184 EXPORT_SYMBOL_GPL(power_supply_battery_bti_in_range);
1185
psy_has_property(const struct power_supply_desc * psy_desc,enum power_supply_property psp)1186 static bool psy_has_property(const struct power_supply_desc *psy_desc,
1187 enum power_supply_property psp)
1188 {
1189 bool found = false;
1190 int i;
1191
1192 for (i = 0; i < psy_desc->num_properties; i++) {
1193 if (psy_desc->properties[i] == psp) {
1194 found = true;
1195 break;
1196 }
1197 }
1198
1199 return found;
1200 }
1201
power_supply_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)1202 int power_supply_get_property(struct power_supply *psy,
1203 enum power_supply_property psp,
1204 union power_supply_propval *val)
1205 {
1206 if (atomic_read(&psy->use_cnt) <= 0) {
1207 if (!psy->initialized)
1208 return -EAGAIN;
1209 return -ENODEV;
1210 }
1211
1212 if (psy_has_property(psy->desc, psp))
1213 return psy->desc->get_property(psy, psp, val);
1214 else if (power_supply_battery_info_has_prop(psy->battery_info, psp))
1215 return power_supply_battery_info_get_prop(psy->battery_info, psp, val);
1216 else
1217 return -EINVAL;
1218 }
1219 EXPORT_SYMBOL_GPL(power_supply_get_property);
1220
power_supply_set_property(struct power_supply * psy,enum power_supply_property psp,const union power_supply_propval * val)1221 int power_supply_set_property(struct power_supply *psy,
1222 enum power_supply_property psp,
1223 const union power_supply_propval *val)
1224 {
1225 if (atomic_read(&psy->use_cnt) <= 0 || !psy->desc->set_property)
1226 return -ENODEV;
1227
1228 return psy->desc->set_property(psy, psp, val);
1229 }
1230 EXPORT_SYMBOL_GPL(power_supply_set_property);
1231
power_supply_property_is_writeable(struct power_supply * psy,enum power_supply_property psp)1232 int power_supply_property_is_writeable(struct power_supply *psy,
1233 enum power_supply_property psp)
1234 {
1235 if (atomic_read(&psy->use_cnt) <= 0 ||
1236 !psy->desc->property_is_writeable)
1237 return -ENODEV;
1238
1239 return psy->desc->property_is_writeable(psy, psp);
1240 }
1241 EXPORT_SYMBOL_GPL(power_supply_property_is_writeable);
1242
power_supply_external_power_changed(struct power_supply * psy)1243 void power_supply_external_power_changed(struct power_supply *psy)
1244 {
1245 if (atomic_read(&psy->use_cnt) <= 0 ||
1246 !psy->desc->external_power_changed)
1247 return;
1248
1249 psy->desc->external_power_changed(psy);
1250 }
1251 EXPORT_SYMBOL_GPL(power_supply_external_power_changed);
1252
power_supply_powers(struct power_supply * psy,struct device * dev)1253 int power_supply_powers(struct power_supply *psy, struct device *dev)
1254 {
1255 return sysfs_create_link(&psy->dev.kobj, &dev->kobj, "powers");
1256 }
1257 EXPORT_SYMBOL_GPL(power_supply_powers);
1258
power_supply_dev_release(struct device * dev)1259 static void power_supply_dev_release(struct device *dev)
1260 {
1261 struct power_supply *psy = to_power_supply(dev);
1262
1263 dev_dbg(dev, "%s\n", __func__);
1264 kfree(psy);
1265 }
1266
power_supply_reg_notifier(struct notifier_block * nb)1267 int power_supply_reg_notifier(struct notifier_block *nb)
1268 {
1269 return blocking_notifier_chain_register(&power_supply_notifier, nb);
1270 }
1271 EXPORT_SYMBOL_GPL(power_supply_reg_notifier);
1272
power_supply_unreg_notifier(struct notifier_block * nb)1273 void power_supply_unreg_notifier(struct notifier_block *nb)
1274 {
1275 blocking_notifier_chain_unregister(&power_supply_notifier, nb);
1276 }
1277 EXPORT_SYMBOL_GPL(power_supply_unreg_notifier);
1278
1279 #ifdef CONFIG_THERMAL
power_supply_read_temp(struct thermal_zone_device * tzd,int * temp)1280 static int power_supply_read_temp(struct thermal_zone_device *tzd,
1281 int *temp)
1282 {
1283 struct power_supply *psy;
1284 union power_supply_propval val;
1285 int ret;
1286
1287 WARN_ON(tzd == NULL);
1288 psy = thermal_zone_device_priv(tzd);
1289 ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_TEMP, &val);
1290 if (ret)
1291 return ret;
1292
1293 /* Convert tenths of degree Celsius to milli degree Celsius. */
1294 *temp = val.intval * 100;
1295
1296 return ret;
1297 }
1298
1299 static struct thermal_zone_device_ops psy_tzd_ops = {
1300 .get_temp = power_supply_read_temp,
1301 };
1302
psy_register_thermal(struct power_supply * psy)1303 static int psy_register_thermal(struct power_supply *psy)
1304 {
1305 int ret;
1306
1307 if (psy->desc->no_thermal)
1308 return 0;
1309
1310 /* Register battery zone device psy reports temperature */
1311 if (psy_has_property(psy->desc, POWER_SUPPLY_PROP_TEMP)) {
1312 /* Prefer our hwmon device and avoid duplicates */
1313 struct thermal_zone_params tzp = {
1314 .no_hwmon = IS_ENABLED(CONFIG_POWER_SUPPLY_HWMON)
1315 };
1316 psy->tzd = thermal_tripless_zone_device_register(psy->desc->name,
1317 psy, &psy_tzd_ops, &tzp);
1318 if (IS_ERR(psy->tzd))
1319 return PTR_ERR(psy->tzd);
1320 ret = thermal_zone_device_enable(psy->tzd);
1321 if (ret)
1322 thermal_zone_device_unregister(psy->tzd);
1323 return ret;
1324 }
1325
1326 return 0;
1327 }
1328
psy_unregister_thermal(struct power_supply * psy)1329 static void psy_unregister_thermal(struct power_supply *psy)
1330 {
1331 if (IS_ERR_OR_NULL(psy->tzd))
1332 return;
1333 thermal_zone_device_unregister(psy->tzd);
1334 }
1335
1336 #else
psy_register_thermal(struct power_supply * psy)1337 static int psy_register_thermal(struct power_supply *psy)
1338 {
1339 return 0;
1340 }
1341
psy_unregister_thermal(struct power_supply * psy)1342 static void psy_unregister_thermal(struct power_supply *psy)
1343 {
1344 }
1345 #endif
1346
1347 static struct power_supply *__must_check
__power_supply_register(struct device * parent,const struct power_supply_desc * desc,const struct power_supply_config * cfg,bool ws)1348 __power_supply_register(struct device *parent,
1349 const struct power_supply_desc *desc,
1350 const struct power_supply_config *cfg,
1351 bool ws)
1352 {
1353 struct device *dev;
1354 struct power_supply *psy;
1355 int rc;
1356
1357 if (!desc || !desc->name || !desc->properties || !desc->num_properties)
1358 return ERR_PTR(-EINVAL);
1359
1360 if (!parent)
1361 pr_warn("%s: Expected proper parent device for '%s'\n",
1362 __func__, desc->name);
1363
1364 if (psy_has_property(desc, POWER_SUPPLY_PROP_USB_TYPE) &&
1365 (!desc->usb_types || !desc->num_usb_types))
1366 return ERR_PTR(-EINVAL);
1367
1368 psy = kzalloc(sizeof(*psy), GFP_KERNEL);
1369 if (!psy)
1370 return ERR_PTR(-ENOMEM);
1371
1372 dev = &psy->dev;
1373
1374 device_initialize(dev);
1375
1376 dev->class = &power_supply_class;
1377 dev->type = &power_supply_dev_type;
1378 dev->parent = parent;
1379 dev->release = power_supply_dev_release;
1380 dev_set_drvdata(dev, psy);
1381 psy->desc = desc;
1382 if (cfg) {
1383 dev->groups = cfg->attr_grp;
1384 psy->drv_data = cfg->drv_data;
1385 psy->of_node =
1386 cfg->fwnode ? to_of_node(cfg->fwnode) : cfg->of_node;
1387 dev->of_node = psy->of_node;
1388 psy->supplied_to = cfg->supplied_to;
1389 psy->num_supplicants = cfg->num_supplicants;
1390 }
1391
1392 rc = dev_set_name(dev, "%s", desc->name);
1393 if (rc)
1394 goto dev_set_name_failed;
1395
1396 INIT_WORK(&psy->changed_work, power_supply_changed_work);
1397 INIT_DELAYED_WORK(&psy->deferred_register_work,
1398 power_supply_deferred_register_work);
1399
1400 rc = power_supply_check_supplies(psy);
1401 if (rc) {
1402 dev_dbg(dev, "Not all required supplies found, defer probe\n");
1403 goto check_supplies_failed;
1404 }
1405
1406 /*
1407 * Expose constant battery info, if it is available. While there are
1408 * some chargers accessing constant battery data, we only want to
1409 * expose battery data to userspace for battery devices.
1410 */
1411 if (desc->type == POWER_SUPPLY_TYPE_BATTERY) {
1412 rc = power_supply_get_battery_info(psy, &psy->battery_info);
1413 if (rc && rc != -ENODEV && rc != -ENOENT)
1414 goto check_supplies_failed;
1415 }
1416
1417 spin_lock_init(&psy->changed_lock);
1418 rc = device_add(dev);
1419 if (rc)
1420 goto device_add_failed;
1421
1422 rc = device_init_wakeup(dev, ws);
1423 if (rc)
1424 goto wakeup_init_failed;
1425
1426 rc = psy_register_thermal(psy);
1427 if (rc)
1428 goto register_thermal_failed;
1429
1430 rc = power_supply_create_triggers(psy);
1431 if (rc)
1432 goto create_triggers_failed;
1433
1434 rc = power_supply_add_hwmon_sysfs(psy);
1435 if (rc)
1436 goto add_hwmon_sysfs_failed;
1437
1438 /*
1439 * Update use_cnt after any uevents (most notably from device_add()).
1440 * We are here still during driver's probe but
1441 * the power_supply_uevent() calls back driver's get_property
1442 * method so:
1443 * 1. Driver did not assigned the returned struct power_supply,
1444 * 2. Driver could not finish initialization (anything in its probe
1445 * after calling power_supply_register()).
1446 */
1447 atomic_inc(&psy->use_cnt);
1448 psy->initialized = true;
1449
1450 queue_delayed_work(system_power_efficient_wq,
1451 &psy->deferred_register_work,
1452 POWER_SUPPLY_DEFERRED_REGISTER_TIME);
1453
1454 return psy;
1455
1456 add_hwmon_sysfs_failed:
1457 power_supply_remove_triggers(psy);
1458 create_triggers_failed:
1459 psy_unregister_thermal(psy);
1460 register_thermal_failed:
1461 wakeup_init_failed:
1462 device_del(dev);
1463 device_add_failed:
1464 check_supplies_failed:
1465 dev_set_name_failed:
1466 put_device(dev);
1467 return ERR_PTR(rc);
1468 }
1469
1470 /**
1471 * power_supply_register() - Register new power supply
1472 * @parent: Device to be a parent of power supply's device, usually
1473 * the device which probe function calls this
1474 * @desc: Description of power supply, must be valid through whole
1475 * lifetime of this power supply
1476 * @cfg: Run-time specific configuration accessed during registering,
1477 * may be NULL
1478 *
1479 * Return: A pointer to newly allocated power_supply on success
1480 * or ERR_PTR otherwise.
1481 * Use power_supply_unregister() on returned power_supply pointer to release
1482 * resources.
1483 */
power_supply_register(struct device * parent,const struct power_supply_desc * desc,const struct power_supply_config * cfg)1484 struct power_supply *__must_check power_supply_register(struct device *parent,
1485 const struct power_supply_desc *desc,
1486 const struct power_supply_config *cfg)
1487 {
1488 return __power_supply_register(parent, desc, cfg, true);
1489 }
1490 EXPORT_SYMBOL_GPL(power_supply_register);
1491
1492 /**
1493 * power_supply_register_no_ws() - Register new non-waking-source power supply
1494 * @parent: Device to be a parent of power supply's device, usually
1495 * the device which probe function calls this
1496 * @desc: Description of power supply, must be valid through whole
1497 * lifetime of this power supply
1498 * @cfg: Run-time specific configuration accessed during registering,
1499 * may be NULL
1500 *
1501 * Return: A pointer to newly allocated power_supply on success
1502 * or ERR_PTR otherwise.
1503 * Use power_supply_unregister() on returned power_supply pointer to release
1504 * resources.
1505 */
1506 struct power_supply *__must_check
power_supply_register_no_ws(struct device * parent,const struct power_supply_desc * desc,const struct power_supply_config * cfg)1507 power_supply_register_no_ws(struct device *parent,
1508 const struct power_supply_desc *desc,
1509 const struct power_supply_config *cfg)
1510 {
1511 return __power_supply_register(parent, desc, cfg, false);
1512 }
1513 EXPORT_SYMBOL_GPL(power_supply_register_no_ws);
1514
devm_power_supply_release(struct device * dev,void * res)1515 static void devm_power_supply_release(struct device *dev, void *res)
1516 {
1517 struct power_supply **psy = res;
1518
1519 power_supply_unregister(*psy);
1520 }
1521
1522 /**
1523 * devm_power_supply_register() - Register managed power supply
1524 * @parent: Device to be a parent of power supply's device, usually
1525 * the device which probe function calls this
1526 * @desc: Description of power supply, must be valid through whole
1527 * lifetime of this power supply
1528 * @cfg: Run-time specific configuration accessed during registering,
1529 * may be NULL
1530 *
1531 * Return: A pointer to newly allocated power_supply on success
1532 * or ERR_PTR otherwise.
1533 * The returned power_supply pointer will be automatically unregistered
1534 * on driver detach.
1535 */
1536 struct power_supply *__must_check
devm_power_supply_register(struct device * parent,const struct power_supply_desc * desc,const struct power_supply_config * cfg)1537 devm_power_supply_register(struct device *parent,
1538 const struct power_supply_desc *desc,
1539 const struct power_supply_config *cfg)
1540 {
1541 struct power_supply **ptr, *psy;
1542
1543 ptr = devres_alloc(devm_power_supply_release, sizeof(*ptr), GFP_KERNEL);
1544
1545 if (!ptr)
1546 return ERR_PTR(-ENOMEM);
1547 psy = __power_supply_register(parent, desc, cfg, true);
1548 if (IS_ERR(psy)) {
1549 devres_free(ptr);
1550 } else {
1551 *ptr = psy;
1552 devres_add(parent, ptr);
1553 }
1554 return psy;
1555 }
1556 EXPORT_SYMBOL_GPL(devm_power_supply_register);
1557
1558 /**
1559 * devm_power_supply_register_no_ws() - Register managed non-waking-source power supply
1560 * @parent: Device to be a parent of power supply's device, usually
1561 * the device which probe function calls this
1562 * @desc: Description of power supply, must be valid through whole
1563 * lifetime of this power supply
1564 * @cfg: Run-time specific configuration accessed during registering,
1565 * may be NULL
1566 *
1567 * Return: A pointer to newly allocated power_supply on success
1568 * or ERR_PTR otherwise.
1569 * The returned power_supply pointer will be automatically unregistered
1570 * on driver detach.
1571 */
1572 struct power_supply *__must_check
devm_power_supply_register_no_ws(struct device * parent,const struct power_supply_desc * desc,const struct power_supply_config * cfg)1573 devm_power_supply_register_no_ws(struct device *parent,
1574 const struct power_supply_desc *desc,
1575 const struct power_supply_config *cfg)
1576 {
1577 struct power_supply **ptr, *psy;
1578
1579 ptr = devres_alloc(devm_power_supply_release, sizeof(*ptr), GFP_KERNEL);
1580
1581 if (!ptr)
1582 return ERR_PTR(-ENOMEM);
1583 psy = __power_supply_register(parent, desc, cfg, false);
1584 if (IS_ERR(psy)) {
1585 devres_free(ptr);
1586 } else {
1587 *ptr = psy;
1588 devres_add(parent, ptr);
1589 }
1590 return psy;
1591 }
1592 EXPORT_SYMBOL_GPL(devm_power_supply_register_no_ws);
1593
1594 /**
1595 * power_supply_unregister() - Remove this power supply from system
1596 * @psy: Pointer to power supply to unregister
1597 *
1598 * Remove this power supply from the system. The resources of power supply
1599 * will be freed here or on last power_supply_put() call.
1600 */
power_supply_unregister(struct power_supply * psy)1601 void power_supply_unregister(struct power_supply *psy)
1602 {
1603 WARN_ON(atomic_dec_return(&psy->use_cnt));
1604 psy->removing = true;
1605 cancel_work_sync(&psy->changed_work);
1606 cancel_delayed_work_sync(&psy->deferred_register_work);
1607 sysfs_remove_link(&psy->dev.kobj, "powers");
1608 power_supply_remove_hwmon_sysfs(psy);
1609 power_supply_remove_triggers(psy);
1610 psy_unregister_thermal(psy);
1611 device_init_wakeup(&psy->dev, false);
1612 device_unregister(&psy->dev);
1613 }
1614 EXPORT_SYMBOL_GPL(power_supply_unregister);
1615
power_supply_get_drvdata(struct power_supply * psy)1616 void *power_supply_get_drvdata(struct power_supply *psy)
1617 {
1618 return psy->drv_data;
1619 }
1620 EXPORT_SYMBOL_GPL(power_supply_get_drvdata);
1621
power_supply_class_init(void)1622 static int __init power_supply_class_init(void)
1623 {
1624 power_supply_init_attrs();
1625 return class_register(&power_supply_class);
1626 }
1627
power_supply_class_exit(void)1628 static void __exit power_supply_class_exit(void)
1629 {
1630 class_unregister(&power_supply_class);
1631 }
1632
1633 subsys_initcall(power_supply_class_init);
1634 module_exit(power_supply_class_exit);
1635
1636 MODULE_DESCRIPTION("Universal power supply monitor class");
1637 MODULE_AUTHOR("Ian Molton <spyro@f2s.com>");
1638 MODULE_AUTHOR("Szabolcs Gyurko");
1639 MODULE_AUTHOR("Anton Vorontsov <cbou@mail.ru>");
1640