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 | |
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 | |
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(supplier: psy, supply: pst)) { |
74 | if (pst->desc->external_power_changed) |
75 | pst->desc->external_power_changed(pst); |
76 | } |
77 | |
78 | return 0; |
79 | } |
80 | |
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(lock: &psy->changed_lock, flags); |
100 | power_supply_for_each_device(data: psy, fn: __power_supply_changed_work); |
101 | power_supply_update_leds(psy); |
102 | blocking_notifier_call_chain(nh: &power_supply_notifier, |
103 | val: PSY_EVENT_PROP_CHANGED, v: psy); |
104 | kobject_uevent(kobj: &psy->dev.kobj, action: 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(dev: &psy->dev); |
115 | spin_unlock_irqrestore(lock: &psy->changed_lock, flags); |
116 | } |
117 | |
118 | int power_supply_for_each_device(void *data, int (*fn)(struct device *dev, void *data)) |
119 | { |
120 | return class_for_each_device(class: &power_supply_class, NULL, data, fn); |
121 | } |
122 | EXPORT_SYMBOL_GPL(power_supply_for_each_device); |
123 | |
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(dev: &psy->dev); |
133 | spin_unlock_irqrestore(lock: &psy->changed_lock, flags); |
134 | schedule_work(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 | */ |
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(lock: &psy->dev.parent->mutex)) { |
155 | if (psy->removing) |
156 | return; |
157 | msleep(msecs: 10); |
158 | } |
159 | } |
160 | |
161 | power_supply_changed(psy); |
162 | |
163 | if (psy->dev.parent) |
164 | mutex_unlock(lock: &psy->dev.parent->mutex); |
165 | } |
166 | |
167 | #ifdef CONFIG_OF |
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(np: psy->of_node, phandle_name: "power-supplies" , index: 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(node: np); |
187 | break; |
188 | } |
189 | of_node_put(node: np); |
190 | } while (np); |
191 | |
192 | return 0; |
193 | } |
194 | |
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 | |
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 | |
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 | |
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(np: psy->of_node, phandle_name: "power-supplies" , index: cnt++); |
255 | if (!np) |
256 | break; |
257 | |
258 | ret = power_supply_find_supply_from_node(supply_node: np); |
259 | of_node_put(node: 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(dev: &psy->dev, size: sizeof(*psy->supplied_from), |
273 | GFP_KERNEL); |
274 | if (!psy->supplied_from) |
275 | return -ENOMEM; |
276 | |
277 | *psy->supplied_from = devm_kcalloc(dev: &psy->dev, |
278 | n: cnt - 1, size: 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 |
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 | |
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(supplier: epsy, supply: 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 | |
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 | |
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 | |
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 | |
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(supplier: epsy, supply: data->psy)) |
399 | if (!power_supply_get_property(psy: epsy, psp: data->psp, val: data->val)) |
400 | return 1; /* Success */ |
401 | |
402 | return 0; /* Continue iterating */ |
403 | } |
404 | |
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 | |
430 | int power_supply_set_battery_charged(struct power_supply *psy) |
431 | { |
432 | if (atomic_read(v: &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 | |
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 | */ |
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(class: &power_supply_class, NULL, data: name, |
466 | match: power_supply_match_device_by_name); |
467 | |
468 | if (dev) { |
469 | psy = dev_get_drvdata(dev); |
470 | atomic_inc(v: &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 | */ |
484 | void power_supply_put(struct power_supply *psy) |
485 | { |
486 | might_sleep(); |
487 | |
488 | atomic_dec(v: &psy->use_cnt); |
489 | put_device(dev: &psy->dev); |
490 | } |
491 | EXPORT_SYMBOL_GPL(power_supply_put); |
492 | |
493 | #ifdef CONFIG_OF |
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 | */ |
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, phandle_name: property, index: 0); |
519 | if (!power_supply_np) |
520 | return ERR_PTR(error: -ENODEV); |
521 | |
522 | dev = class_find_device(class: &power_supply_class, NULL, data: power_supply_np, |
523 | match: power_supply_match_device_node); |
524 | |
525 | of_node_put(node: power_supply_np); |
526 | |
527 | if (dev) { |
528 | psy = dev_get_drvdata(dev); |
529 | atomic_inc(v: &psy->use_cnt); |
530 | } |
531 | |
532 | return psy; |
533 | } |
534 | EXPORT_SYMBOL_GPL(power_supply_get_by_phandle); |
535 | |
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 | */ |
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(error: -ENODEV); |
559 | |
560 | ptr = devres_alloc(devm_power_supply_put, sizeof(*ptr), GFP_KERNEL); |
561 | if (!ptr) |
562 | return ERR_PTR(error: -ENOMEM); |
563 | |
564 | psy = power_supply_get_by_phandle(dev->of_node, property); |
565 | if (IS_ERR_OR_NULL(ptr: psy)) { |
566 | devres_free(res: ptr); |
567 | } else { |
568 | *ptr = psy; |
569 | devres_add(dev, res: ptr); |
570 | } |
571 | return psy; |
572 | } |
573 | EXPORT_SYMBOL_GPL(devm_power_supply_get_by_phandle); |
574 | #endif /* CONFIG_OF */ |
575 | |
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(np: psy->of_node, phandle_name: "monitored-battery" , index: 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 | prop: "monitored-battery" , NULL, nargs: 0, index: 0, args: &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, propname: "compatible" , val: &value); |
609 | if (err) |
610 | goto out_put_node; |
611 | |
612 | |
613 | /* Try static batteries first */ |
614 | err = samsung_sdi_battery_get_info(dev: &psy->dev, compatible: value, info: &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(dev: &psy->dev, size: 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, propname: "device-chemistry" , val: &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, propname: "energy-full-design-microwatt-hours" , |
694 | val: &info->energy_full_design_uwh); |
695 | fwnode_property_read_u32(fwnode, propname: "charge-full-design-microamp-hours" , |
696 | val: &info->charge_full_design_uah); |
697 | fwnode_property_read_u32(fwnode, propname: "voltage-min-design-microvolt" , |
698 | val: &info->voltage_min_design_uv); |
699 | fwnode_property_read_u32(fwnode, propname: "voltage-max-design-microvolt" , |
700 | val: &info->voltage_max_design_uv); |
701 | fwnode_property_read_u32(fwnode, propname: "trickle-charge-current-microamp" , |
702 | val: &info->tricklecharge_current_ua); |
703 | fwnode_property_read_u32(fwnode, propname: "precharge-current-microamp" , |
704 | val: &info->precharge_current_ua); |
705 | fwnode_property_read_u32(fwnode, propname: "precharge-upper-limit-microvolt" , |
706 | val: &info->precharge_voltage_max_uv); |
707 | fwnode_property_read_u32(fwnode, propname: "charge-term-current-microamp" , |
708 | val: &info->charge_term_current_ua); |
709 | fwnode_property_read_u32(fwnode, propname: "re-charge-voltage-microvolt" , |
710 | val: &info->charge_restart_voltage_uv); |
711 | fwnode_property_read_u32(fwnode, propname: "over-voltage-threshold-microvolt" , |
712 | val: &info->overvoltage_limit_uv); |
713 | fwnode_property_read_u32(fwnode, propname: "constant-charge-current-max-microamp" , |
714 | val: &info->constant_charge_current_max_ua); |
715 | fwnode_property_read_u32(fwnode, propname: "constant-charge-voltage-max-microvolt" , |
716 | val: &info->constant_charge_voltage_max_uv); |
717 | fwnode_property_read_u32(fwnode, propname: "factory-internal-resistance-micro-ohms" , |
718 | val: &info->factory_internal_resistance_uohm); |
719 | |
720 | if (!fwnode_property_read_u32_array(fwnode, propname: "ambient-celsius" , |
721 | val: 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, propname: "alert-celsius" , |
726 | val: 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, propname: "operating-range-celsius" , |
731 | val: 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(np: battery_np, propname: "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(np: battery_np, propname: "ocv-capacity-celsius" , |
754 | out_values: info->ocv_temp, sz: 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, fmt: "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(node: battery_np, name: propname, lenp: &size); |
769 | if (!list || !size) { |
770 | dev_err(&psy->dev, "failed to get %s\n" , propname); |
771 | kfree(objp: propname); |
772 | power_supply_put_battery_info(psy, info); |
773 | err = -EINVAL; |
774 | goto out_put_node; |
775 | } |
776 | |
777 | kfree(objp: 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(dev: &psy->dev, n: tab_len, size: 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(node: battery_np, name: "resistance-temp-table" , lenp: &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(dev: &psy->dev, |
803 | n: info->resist_table_size, |
804 | size: 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(node: battery_np); |
824 | return err; |
825 | } |
826 | EXPORT_SYMBOL_GPL(power_supply_get_battery_info); |
827 | |
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(dev: &psy->dev, p: info->ocv_table[i]); |
836 | } |
837 | |
838 | if (info->resist_table) |
839 | devm_kfree(dev: &psy->dev, p: info->resist_table); |
840 | |
841 | devm_kfree(dev: &psy->dev, p: 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 | |
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 | |
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 | */ |
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(x0: table[low].temp, |
1004 | y0: table[low].resistance, |
1005 | x1: table[high].temp, |
1006 | y1: table[high].resistance, |
1007 | x: 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 | */ |
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(x0: vbat2ri[low].vbat_uv, |
1068 | y0: vbat2ri[low].ri_uohm, |
1069 | x1: vbat2ri[high].vbat_uv, |
1070 | y1: vbat2ri[high].ri_uohm, |
1071 | x: vbat_uv); |
1072 | } |
1073 | EXPORT_SYMBOL_GPL(power_supply_vbat2ri); |
1074 | |
1075 | struct power_supply_maintenance_charge_table * |
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 | */ |
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(x0: table[low].ocv, |
1115 | y0: table[low].capacity, |
1116 | x1: table[high].ocv, |
1117 | y1: table[high].capacity, |
1118 | x: ocv); |
1119 | } |
1120 | EXPORT_SYMBOL_GPL(power_supply_ocv2cap_simple); |
1121 | |
1122 | struct power_supply_battery_ocv_table * |
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 | |
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 | |
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 | |
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 | |
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(v: &psy->use_cnt) <= 0) { |
1207 | if (!psy->initialized) |
1208 | return -EAGAIN; |
1209 | return -ENODEV; |
1210 | } |
1211 | |
1212 | if (psy_has_property(psy_desc: 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 | |
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(v: &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 | |
1232 | int power_supply_property_is_writeable(struct power_supply *psy, |
1233 | enum power_supply_property psp) |
1234 | { |
1235 | if (atomic_read(v: &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 | |
1243 | void power_supply_external_power_changed(struct power_supply *psy) |
1244 | { |
1245 | if (atomic_read(v: &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 | |
1253 | int power_supply_powers(struct power_supply *psy, struct device *dev) |
1254 | { |
1255 | return sysfs_create_link(kobj: &psy->dev.kobj, target: &dev->kobj, name: "powers" ); |
1256 | } |
1257 | EXPORT_SYMBOL_GPL(power_supply_powers); |
1258 | |
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(objp: psy); |
1265 | } |
1266 | |
1267 | int power_supply_reg_notifier(struct notifier_block *nb) |
1268 | { |
1269 | return blocking_notifier_chain_register(nh: &power_supply_notifier, nb); |
1270 | } |
1271 | EXPORT_SYMBOL_GPL(power_supply_reg_notifier); |
1272 | |
1273 | void power_supply_unreg_notifier(struct notifier_block *nb) |
1274 | { |
1275 | blocking_notifier_chain_unregister(nh: &power_supply_notifier, nb); |
1276 | } |
1277 | EXPORT_SYMBOL_GPL(power_supply_unreg_notifier); |
1278 | |
1279 | #ifdef CONFIG_THERMAL |
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 | |
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: psy->desc, psp: 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(type: psy->desc->name, |
1317 | devdata: psy, ops: &psy_tzd_ops, tzp: &tzp); |
1318 | if (IS_ERR(ptr: psy->tzd)) |
1319 | return PTR_ERR(ptr: psy->tzd); |
1320 | ret = thermal_zone_device_enable(tz: psy->tzd); |
1321 | if (ret) |
1322 | thermal_zone_device_unregister(tz: psy->tzd); |
1323 | return ret; |
1324 | } |
1325 | |
1326 | return 0; |
1327 | } |
1328 | |
1329 | static void psy_unregister_thermal(struct power_supply *psy) |
1330 | { |
1331 | if (IS_ERR_OR_NULL(ptr: psy->tzd)) |
1332 | return; |
1333 | thermal_zone_device_unregister(tz: psy->tzd); |
1334 | } |
1335 | |
1336 | #else |
1337 | static int psy_register_thermal(struct power_supply *psy) |
1338 | { |
1339 | return 0; |
1340 | } |
1341 | |
1342 | static void psy_unregister_thermal(struct power_supply *psy) |
1343 | { |
1344 | } |
1345 | #endif |
1346 | |
1347 | static struct power_supply *__must_check |
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(error: -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(psy_desc: desc, psp: POWER_SUPPLY_PROP_USB_TYPE) && |
1365 | (!desc->usb_types || !desc->num_usb_types)) |
1366 | return ERR_PTR(error: -EINVAL); |
1367 | |
1368 | psy = kzalloc(size: sizeof(*psy), GFP_KERNEL); |
1369 | if (!psy) |
1370 | return ERR_PTR(error: -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, data: 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, name: "%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, enable: 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(v: &psy->use_cnt); |
1448 | psy->initialized = true; |
1449 | |
1450 | queue_delayed_work(wq: system_power_efficient_wq, |
1451 | dwork: &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(error: 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 | */ |
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, ws: 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 |
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, ws: false); |
1512 | } |
1513 | EXPORT_SYMBOL_GPL(power_supply_register_no_ws); |
1514 | |
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: *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 |
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(error: -ENOMEM); |
1547 | psy = __power_supply_register(parent, desc, cfg, ws: true); |
1548 | if (IS_ERR(ptr: psy)) { |
1549 | devres_free(res: ptr); |
1550 | } else { |
1551 | *ptr = psy; |
1552 | devres_add(dev: parent, res: 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 |
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(error: -ENOMEM); |
1583 | psy = __power_supply_register(parent, desc, cfg, ws: false); |
1584 | if (IS_ERR(ptr: psy)) { |
1585 | devres_free(res: ptr); |
1586 | } else { |
1587 | *ptr = psy; |
1588 | devres_add(dev: parent, res: 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 | */ |
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(work: &psy->changed_work); |
1606 | cancel_delayed_work_sync(dwork: &psy->deferred_register_work); |
1607 | sysfs_remove_link(kobj: &psy->dev.kobj, name: "powers" ); |
1608 | power_supply_remove_hwmon_sysfs(psy); |
1609 | power_supply_remove_triggers(psy); |
1610 | psy_unregister_thermal(psy); |
1611 | device_init_wakeup(dev: &psy->dev, enable: false); |
1612 | device_unregister(dev: &psy->dev); |
1613 | } |
1614 | EXPORT_SYMBOL_GPL(power_supply_unregister); |
1615 | |
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 | |
1622 | static int __init power_supply_class_init(void) |
1623 | { |
1624 | power_supply_init_attrs(); |
1625 | return class_register(class: &power_supply_class); |
1626 | } |
1627 | |
1628 | static void __exit power_supply_class_exit(void) |
1629 | { |
1630 | class_unregister(class: &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 | |