drivers/power/supply/power_supply_core.c

   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 /* exported for the APM Power driver, APM emulation */
  29 const struct class power_supply_class = {
  30         .name = "power_supply",
  31         .dev_uevent = power_supply_uevent,
  32 };
  33 EXPORT_SYMBOL_GPL(power_supply_class);
  34
  35 static BLOCKING_NOTIFIER_HEAD(power_supply_notifier);
  36
  37 __ATTRIBUTE_GROUPS(power_supply_attr);
  38 static const struct device_type power_supply_dev_type = {
  39         .name = "power_supply",
  40         .groups = power_supply_attr_groups,
  41 };
  42
  43 #define POWER_SUPPLY_DEFERRED_REGISTER_TIME     msecs_to_jiffies(10)
  44
  45 static bool __power_supply_is_supplied_by(struct power_supply *supplier,
  46                                          struct power_supply *supply)
  47 {
  48         int i;
  49
  50         if (!supply->supplied_from && !supplier->supplied_to)
  51                 return false;
  52
  53         /* Support both supplied_to and supplied_from modes */
  54         if (supply->supplied_from) {
  55                 if (!supplier->desc->name)
  56                         return false;
  57                 for (i = 0; i < supply->num_supplies; i++)
  58                         if (!strcmp(supplier->desc->name, supply->supplied_from[i]))
  59                                 return true;
  60         } else {
  61                 if (!supply->desc->name)
  62                         return false;
  63                 for (i = 0; i < supplier->num_supplicants; i++)
  64                         if (!strcmp(supplier->supplied_to[i], supply->desc->name))
  65                                 return true;
  66         }
  67
  68         return false;
  69 }
  70
  71 static int __power_supply_changed_work(struct device *dev, void *data)
  72 {
  73         struct power_supply *psy = data;
  74         struct power_supply *pst = dev_get_drvdata(dev);
  75
  76         if (__power_supply_is_supplied_by(psy, pst)) {
  77                 if (pst->desc->external_power_changed)
  78                         pst->desc->external_power_changed(pst);
  79         }
  80
  81         return 0;
  82 }
  83
  84 static void power_supply_changed_work(struct work_struct *work)
  85 {
  86         unsigned long flags;
  87         struct power_supply *psy = container_of(work, struct power_supply,
  88                                                 changed_work);
  89
  90         dev_dbg(&psy->dev, "%s\n", __func__);
  91
  92         spin_lock_irqsave(&psy->changed_lock, flags);
  93         /*
  94          * Check 'changed' here to avoid issues due to race between
  95          * power_supply_changed() and this routine. In worst case
  96          * power_supply_changed() can be called again just before we take above
  97          * lock. During the first call of this routine we will mark 'changed' as
  98          * false and it will stay false for the next call as well.
  99          */
 100         if (likely(psy->changed)) {
 101                 psy->changed = false;
 102                 spin_unlock_irqrestore(&psy->changed_lock, flags);
 103                 class_for_each_device(&power_supply_class, NULL, psy,
 104                                       __power_supply_changed_work);
 105                 power_supply_update_leds(psy);
 106                 blocking_notifier_call_chain(&power_supply_notifier,
 107                                 PSY_EVENT_PROP_CHANGED, psy);
 108                 kobject_uevent(&psy->dev.kobj, KOBJ_CHANGE);
 109                 spin_lock_irqsave(&psy->changed_lock, flags);
 110         }
 111
 112         /*
 113          * Hold the wakeup_source until all events are processed.
 114          * power_supply_changed() might have called again and have set 'changed'
 115          * to true.
 116          */
 117         if (likely(!psy->changed))
 118                 pm_relax(&psy->dev);
 119         spin_unlock_irqrestore(&psy->changed_lock, flags);
 120 }
 121
 122 void power_supply_changed(struct power_supply *psy)
 123 {
 124         unsigned long flags;
 125
 126         dev_dbg(&psy->dev, "%s\n", __func__);
 127
 128         spin_lock_irqsave(&psy->changed_lock, flags);
 129         psy->changed = true;
 130         pm_stay_awake(&psy->dev);
 131         spin_unlock_irqrestore(&psy->changed_lock, flags);
 132         schedule_work(&psy->changed_work);
 133 }
 134 EXPORT_SYMBOL_GPL(power_supply_changed);
 135
 136 /*
 137  * Notify that power supply was registered after parent finished the probing.
 138  *
 139  * Often power supply is registered from driver's probe function. However
 140  * calling power_supply_changed() directly from power_supply_register()
 141  * would lead to execution of get_property() function provided by the driver
 142  * too early - before the probe ends.
 143  *
 144  * Avoid that by waiting on parent's mutex.
 145  */
 146 static void power_supply_deferred_register_work(struct work_struct *work)
 147 {
 148         struct power_supply *psy = container_of(work, struct power_supply,
 149                                                 deferred_register_work.work);
 150
 151         if (psy->dev.parent) {
 152                 while (!mutex_trylock(&psy->dev.parent->mutex)) {
 153                         if (psy->removing)
 154                                 return;
 155                         msleep(10);
 156                 }
 157         }
 158
 159         power_supply_changed(psy);
 160
 161         if (psy->dev.parent)
 162                 mutex_unlock(&psy->dev.parent->mutex);
 163 }
 164
 165 #ifdef CONFIG_OF
 166 static int __power_supply_populate_supplied_from(struct device *dev,
 167                                                  void *data)
 168 {
 169         struct power_supply *psy = data;
 170         struct power_supply *epsy = dev_get_drvdata(dev);
 171         struct device_node *np;
 172         int i = 0;
 173
 174         do {
 175                 np = of_parse_phandle(psy->of_node, "power-supplies", i++);
 176                 if (!np)
 177                         break;
 178
 179                 if (np == epsy->of_node) {
 180                         dev_dbg(&psy->dev, "%s: Found supply : %s\n",
 181                                 psy->desc->name, epsy->desc->name);
 182                         psy->supplied_from[i-1] = (char *)epsy->desc->name;
 183                         psy->num_supplies++;
 184                         of_node_put(np);
 185                         break;
 186                 }
 187                 of_node_put(np);
 188         } while (np);
 189
 190         return 0;
 191 }
 192
 193 static int power_supply_populate_supplied_from(struct power_supply *psy)
 194 {
 195         int error;
 196
 197         error = class_for_each_device(&power_supply_class, NULL, psy,
 198                                       __power_supply_populate_supplied_from);
 199
 200         dev_dbg(&psy->dev, "%s %d\n", __func__, error);
 201
 202         return error;
 203 }
 204
 205 static int  __power_supply_find_supply_from_node(struct device *dev,
 206                                                  void *data)
 207 {
 208         struct device_node *np = data;
 209         struct power_supply *epsy = dev_get_drvdata(dev);
 210
 211         /* returning non-zero breaks out of class_for_each_device loop */
 212         if (epsy->of_node == np)
 213                 return 1;
 214
 215         return 0;
 216 }
 217
 218 static int power_supply_find_supply_from_node(struct device_node *supply_node)
 219 {
 220         int error;
 221
 222         /*
 223          * class_for_each_device() either returns its own errors or values
 224          * returned by __power_supply_find_supply_from_node().
 225          *
 226          * __power_supply_find_supply_from_node() will return 0 (no match)
 227          * or 1 (match).
 228          *
 229          * We return 0 if class_for_each_device() returned 1, -EPROBE_DEFER if
 230          * it returned 0, or error as returned by it.
 231          */
 232         error = class_for_each_device(&power_supply_class, NULL, supply_node,
 233                                       __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(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
 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(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
 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 = class_for_each_device(&power_supply_class, NULL, &data,
 340                                       __power_supply_am_i_supplied);
 341
 342         dev_dbg(&psy->dev, "%s count %u err %d\n", __func__, data.count, error);
 343
 344         if (data.count == 0)
 345                 return -ENODEV;
 346
 347         return error;
 348 }
 349 EXPORT_SYMBOL_GPL(power_supply_am_i_supplied);
 350
 351 static int __power_supply_is_system_supplied(struct device *dev, void *data)
 352 {
 353         union power_supply_propval ret = {0,};
 354         struct power_supply *psy = dev_get_drvdata(dev);
 355         unsigned int *count = data;
 356
 357         if (!psy->desc->get_property(psy, POWER_SUPPLY_PROP_SCOPE, &ret))
 358                 if (ret.intval == POWER_SUPPLY_SCOPE_DEVICE)
 359                         return 0;
 360
 361         (*count)++;
 362         if (psy->desc->type != POWER_SUPPLY_TYPE_BATTERY)
 363                 if (!psy->desc->get_property(psy, POWER_SUPPLY_PROP_ONLINE,
 364                                         &ret))
 365                         return ret.intval;
 366
 367         return 0;
 368 }
 369
 370 int power_supply_is_system_supplied(void)
 371 {
 372         int error;
 373         unsigned int count = 0;
 374
 375         error = class_for_each_device(&power_supply_class, NULL, &count,
 376                                       __power_supply_is_system_supplied);
 377
 378         /*
 379          * If no system scope power class device was found at all, most probably we
 380          * are running on a desktop system, so assume we are on mains power.
 381          */
 382         if (count == 0)
 383                 return 1;
 384
 385         return error;
 386 }
 387 EXPORT_SYMBOL_GPL(power_supply_is_system_supplied);
 388
 389 struct psy_get_supplier_prop_data {
 390         struct power_supply *psy;
 391         enum power_supply_property psp;
 392         union power_supply_propval *val;
 393 };
 394
 395 static int __power_supply_get_supplier_property(struct device *dev, void *_data)
 396 {
 397         struct power_supply *epsy = dev_get_drvdata(dev);
 398         struct psy_get_supplier_prop_data *data = _data;
 399
 400         if (__power_supply_is_supplied_by(epsy, data->psy))
 401                 if (!power_supply_get_property(epsy, data->psp, data->val))
 402                         return 1; /* Success */
 403
 404         return 0; /* Continue iterating */
 405 }
 406
 407 int power_supply_get_property_from_supplier(struct power_supply *psy,
 408                                             enum power_supply_property psp,
 409                                             union power_supply_propval *val)
 410 {
 411         struct psy_get_supplier_prop_data data = {
 412                 .psy = psy,
 413                 .psp = psp,
 414                 .val = val,
 415         };
 416         int ret;
 417
 418         /*
 419          * This function is not intended for use with a supply with multiple
 420          * suppliers, we simply pick the first supply to report the psp.
 421          */
 422         ret = class_for_each_device(&power_supply_class, NULL, &data,
 423                                     __power_supply_get_supplier_property);
 424         if (ret < 0)
 425                 return ret;
 426         if (ret == 0)
 427                 return -ENODEV;
 428
 429         return 0;
 430 }
 431 EXPORT_SYMBOL_GPL(power_supply_get_property_from_supplier);
 432
 433 int power_supply_set_battery_charged(struct power_supply *psy)
 434 {
 435         if (atomic_read(&psy->use_cnt) >= 0 &&
 436                         psy->desc->type == POWER_SUPPLY_TYPE_BATTERY &&
 437                         psy->desc->set_charged) {
 438                 psy->desc->set_charged(psy);
 439                 return 0;
 440         }
 441
 442         return -EINVAL;
 443 }
 444 EXPORT_SYMBOL_GPL(power_supply_set_battery_charged);
 445
 446 static int power_supply_match_device_by_name(struct device *dev, const void *data)
 447 {
 448         const char *name = data;
 449         struct power_supply *psy = dev_get_drvdata(dev);
 450
 451         return strcmp(psy->desc->name, name) == 0;
 452 }
 453
 454 /**
 455  * power_supply_get_by_name() - Search for a power supply and returns its ref
 456  * @name: Power supply name to fetch
 457  *
 458  * If power supply was found, it increases reference count for the
 459  * internal power supply's device. The user should power_supply_put()
 460  * after usage.
 461  *
 462  * Return: On success returns a reference to a power supply with
 463  * matching name equals to @name, a NULL otherwise.
 464  */
 465 struct power_supply *power_supply_get_by_name(const char *name)
 466 {
 467         struct power_supply *psy = NULL;
 468         struct device *dev = class_find_device(&power_supply_class, NULL, name,
 469                                                power_supply_match_device_by_name);
 470
 471         if (dev) {
 472                 psy = dev_get_drvdata(dev);
 473                 atomic_inc(&psy->use_cnt);
 474         }
 475
 476         return psy;
 477 }
 478 EXPORT_SYMBOL_GPL(power_supply_get_by_name);
 479
 480 /**
 481  * power_supply_put() - Drop reference obtained with power_supply_get_by_name
 482  * @psy: Reference to put
 483  *
 484  * The reference to power supply should be put before unregistering
 485  * the power supply.
 486  */
 487 void power_supply_put(struct power_supply *psy)
 488 {
 489         might_sleep();
 490
 491         atomic_dec(&psy->use_cnt);
 492         put_device(&psy->dev);
 493 }
 494 EXPORT_SYMBOL_GPL(power_supply_put);
 495
 496 #ifdef CONFIG_OF
 497 static int power_supply_match_device_node(struct device *dev, const void *data)
 498 {
 499         return dev->parent && dev->parent->of_node == data;
 500 }
 501
 502 /**
 503  * power_supply_get_by_phandle() - Search for a power supply and returns its ref
 504  * @np: Pointer to device node holding phandle property
 505  * @property: Name of property holding a power supply name
 506  *
 507  * If power supply was found, it increases reference count for the
 508  * internal power supply's device. The user should power_supply_put()
 509  * after usage.
 510  *
 511  * Return: On success returns a reference to a power supply with
 512  * matching name equals to value under @property, NULL or ERR_PTR otherwise.
 513  */
 514 struct power_supply *power_supply_get_by_phandle(struct device_node *np,
 515                                                         const char *property)
 516 {
 517         struct device_node *power_supply_np;
 518         struct power_supply *psy = NULL;
 519         struct device *dev;
 520
 521         power_supply_np = of_parse_phandle(np, property, 0);
 522         if (!power_supply_np)
 523                 return ERR_PTR(-ENODEV);
 524
 525         dev = class_find_device(&power_supply_class, NULL, power_supply_np,
 526                                 power_supply_match_device_node);
 527
 528         of_node_put(power_supply_np);
 529
 530         if (dev) {
 531                 psy = dev_get_drvdata(dev);
 532                 atomic_inc(&psy->use_cnt);
 533         }
 534
 535         return psy;
 536 }
 537 EXPORT_SYMBOL_GPL(power_supply_get_by_phandle);
 538
 539 static void devm_power_supply_put(struct device *dev, void *res)
 540 {
 541         struct power_supply **psy = res;
 542
 543         power_supply_put(*psy);
 544 }
 545
 546 /**
 547  * devm_power_supply_get_by_phandle() - Resource managed version of
 548  *  power_supply_get_by_phandle()
 549  * @dev: Pointer to device holding phandle property
 550  * @property: Name of property holding a power supply phandle
 551  *
 552  * Return: On success returns a reference to a power supply with
 553  * matching name equals to value under @property, NULL or ERR_PTR otherwise.
 554  */
 555 struct power_supply *devm_power_supply_get_by_phandle(struct device *dev,
 556                                                       const char *property)
 557 {
 558         struct power_supply **ptr, *psy;
 559
 560         if (!dev->of_node)
 561                 return ERR_PTR(-ENODEV);
 562
 563         ptr = devres_alloc(devm_power_supply_put, sizeof(*ptr), GFP_KERNEL);
 564         if (!ptr)
 565                 return ERR_PTR(-ENOMEM);
 566
 567         psy = power_supply_get_by_phandle(dev->of_node, property);
 568         if (IS_ERR_OR_NULL(psy)) {
 569                 devres_free(ptr);
 570         } else {
 571                 *ptr = psy;
 572                 devres_add(dev, ptr);
 573         }
 574         return psy;
 575 }
 576 EXPORT_SYMBOL_GPL(devm_power_supply_get_by_phandle);
 577 #endif /* CONFIG_OF */
 578
 579 int power_supply_get_battery_info(struct power_supply *psy,
 580                                   struct power_supply_battery_info **info_out)
 581 {
 582         struct power_supply_resistance_temp_table *resist_table;
 583         struct power_supply_battery_info *info;
 584         struct device_node *battery_np = NULL;
 585         struct fwnode_reference_args args;
 586         struct fwnode_handle *fwnode = NULL;
 587         const char *value;
 588         int err, len, index;
 589         const __be32 *list;
 590         u32 min_max[2];
 591
 592         if (psy->of_node) {
 593                 battery_np = of_parse_phandle(psy->of_node, "monitored-battery", 0);
 594                 if (!battery_np)
 595                         return -ENODEV;
 596
 597                 fwnode = fwnode_handle_get(of_fwnode_handle(battery_np));
 598         } else if (psy->dev.parent) {
 599                 err = fwnode_property_get_reference_args(
 600                                         dev_fwnode(psy->dev.parent),
 601                                         "monitored-battery", NULL, 0, 0, &args);
 602                 if (err)
 603                         return err;
 604
 605                 fwnode = args.fwnode;
 606         }
 607
 608         if (!fwnode)
 609                 return -ENOENT;
 610
 611         err = fwnode_property_read_string(fwnode, "compatible", &value);
 612         if (err)
 613                 goto out_put_node;
 614
 615
 616         /* Try static batteries first */
 617         err = samsung_sdi_battery_get_info(&psy->dev, value, &info);
 618         if (!err)
 619                 goto out_ret_pointer;
 620         else if (err == -ENODEV)
 621                 /*
 622                  * Device does not have a static battery.
 623                  * Proceed to look for a simple battery.
 624                  */
 625                 err = 0;
 626
 627         if (strcmp("simple-battery", value)) {
 628                 err = -ENODEV;
 629                 goto out_put_node;
 630         }
 631
 632         info = devm_kzalloc(&psy->dev, sizeof(*info), GFP_KERNEL);
 633         if (!info) {
 634                 err = -ENOMEM;
 635                 goto out_put_node;
 636         }
 637
 638         info->technology                     = POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
 639         info->energy_full_design_uwh         = -EINVAL;
 640         info->charge_full_design_uah         = -EINVAL;
 641         info->voltage_min_design_uv          = -EINVAL;
 642         info->voltage_max_design_uv          = -EINVAL;
 643         info->precharge_current_ua           = -EINVAL;
 644         info->charge_term_current_ua         = -EINVAL;
 645         info->constant_charge_current_max_ua = -EINVAL;
 646         info->constant_charge_voltage_max_uv = -EINVAL;
 647         info->tricklecharge_current_ua       = -EINVAL;
 648         info->precharge_voltage_max_uv       = -EINVAL;
 649         info->charge_restart_voltage_uv      = -EINVAL;
 650         info->overvoltage_limit_uv           = -EINVAL;
 651         info->maintenance_charge             = NULL;
 652         info->alert_low_temp_charge_current_ua = -EINVAL;
 653         info->alert_low_temp_charge_voltage_uv = -EINVAL;
 654         info->alert_high_temp_charge_current_ua = -EINVAL;
 655         info->alert_high_temp_charge_voltage_uv = -EINVAL;
 656         info->temp_ambient_alert_min         = INT_MIN;
 657         info->temp_ambient_alert_max         = INT_MAX;
 658         info->temp_alert_min                 = INT_MIN;
 659         info->temp_alert_max                 = INT_MAX;
 660         info->temp_min                       = INT_MIN;
 661         info->temp_max                       = INT_MAX;
 662         info->factory_internal_resistance_uohm  = -EINVAL;
 663         info->resist_table                   = NULL;
 664         info->bti_resistance_ohm             = -EINVAL;
 665         info->bti_resistance_tolerance       = -EINVAL;
 666
 667         for (index = 0; index < POWER_SUPPLY_OCV_TEMP_MAX; index++) {
 668                 info->ocv_table[index]       = NULL;
 669                 info->ocv_temp[index]        = -EINVAL;
 670                 info->ocv_table_size[index]  = -EINVAL;
 671         }
 672
 673         /* The property and field names below must correspond to elements
 674          * in enum power_supply_property. For reasoning, see
 675          * Documentation/power/power_supply_class.rst.
 676          */
 677
 678         if (!fwnode_property_read_string(fwnode, "device-chemistry", &value)) {
 679                 if (!strcmp("nickel-cadmium", value))
 680                         info->technology = POWER_SUPPLY_TECHNOLOGY_NiCd;
 681                 else if (!strcmp("nickel-metal-hydride", value))
 682                         info->technology = POWER_SUPPLY_TECHNOLOGY_NiMH;
 683                 else if (!strcmp("lithium-ion", value))
 684                         /* Imprecise lithium-ion type */
 685                         info->technology = POWER_SUPPLY_TECHNOLOGY_LION;
 686                 else if (!strcmp("lithium-ion-polymer", value))
 687                         info->technology = POWER_SUPPLY_TECHNOLOGY_LIPO;
 688                 else if (!strcmp("lithium-ion-iron-phosphate", value))
 689                         info->technology = POWER_SUPPLY_TECHNOLOGY_LiFe;
 690                 else if (!strcmp("lithium-ion-manganese-oxide", value))
 691                         info->technology = POWER_SUPPLY_TECHNOLOGY_LiMn;
 692                 else
 693                         dev_warn(&psy->dev, "%s unknown battery type\n", value);
 694         }
 695
 696         fwnode_property_read_u32(fwnode, "energy-full-design-microwatt-hours",
 697                              &info->energy_full_design_uwh);
 698         fwnode_property_read_u32(fwnode, "charge-full-design-microamp-hours",
 699                              &info->charge_full_design_uah);
 700         fwnode_property_read_u32(fwnode, "voltage-min-design-microvolt",
 701                              &info->voltage_min_design_uv);
 702         fwnode_property_read_u32(fwnode, "voltage-max-design-microvolt",
 703                              &info->voltage_max_design_uv);
 704         fwnode_property_read_u32(fwnode, "trickle-charge-current-microamp",
 705                              &info->tricklecharge_current_ua);
 706         fwnode_property_read_u32(fwnode, "precharge-current-microamp",
 707                              &info->precharge_current_ua);
 708         fwnode_property_read_u32(fwnode, "precharge-upper-limit-microvolt",
 709                              &info->precharge_voltage_max_uv);
 710         fwnode_property_read_u32(fwnode, "charge-term-current-microamp",
 711                              &info->charge_term_current_ua);
 712         fwnode_property_read_u32(fwnode, "re-charge-voltage-microvolt",
 713                              &info->charge_restart_voltage_uv);
 714         fwnode_property_read_u32(fwnode, "over-voltage-threshold-microvolt",
 715                              &info->overvoltage_limit_uv);
 716         fwnode_property_read_u32(fwnode, "constant-charge-current-max-microamp",
 717                              &info->constant_charge_current_max_ua);
 718         fwnode_property_read_u32(fwnode, "constant-charge-voltage-max-microvolt",
 719                              &info->constant_charge_voltage_max_uv);
 720         fwnode_property_read_u32(fwnode, "factory-internal-resistance-micro-ohms",
 721                              &info->factory_internal_resistance_uohm);
 722
 723         if (!fwnode_property_read_u32_array(fwnode, "ambient-celsius",
 724                                             min_max, ARRAY_SIZE(min_max))) {
 725                 info->temp_ambient_alert_min = min_max[0];
 726                 info->temp_ambient_alert_max = min_max[1];
 727         }
 728         if (!fwnode_property_read_u32_array(fwnode, "alert-celsius",
 729                                             min_max, ARRAY_SIZE(min_max))) {
 730                 info->temp_alert_min = min_max[0];
 731                 info->temp_alert_max = min_max[1];
 732         }
 733         if (!fwnode_property_read_u32_array(fwnode, "operating-range-celsius",
 734                                             min_max, ARRAY_SIZE(min_max))) {
 735                 info->temp_min = min_max[0];
 736                 info->temp_max = min_max[1];
 737         }
 738
 739         /*
 740          * The below code uses raw of-data parsing to parse
 741          * /schemas/types.yaml#/definitions/uint32-matrix
 742          * data, so for now this is only support with of.
 743          */
 744         if (!battery_np)
 745                 goto out_ret_pointer;
 746
 747         len = of_property_count_u32_elems(battery_np, "ocv-capacity-celsius");
 748         if (len < 0 && len != -EINVAL) {
 749                 err = len;
 750                 goto out_put_node;
 751         } else if (len > POWER_SUPPLY_OCV_TEMP_MAX) {
 752                 dev_err(&psy->dev, "Too many temperature values\n");
 753                 err = -EINVAL;
 754                 goto out_put_node;
 755         } else if (len > 0) {
 756                 of_property_read_u32_array(battery_np, "ocv-capacity-celsius",
 757                                            info->ocv_temp, len);
 758         }
 759
 760         for (index = 0; index < len; index++) {
 761                 struct power_supply_battery_ocv_table *table;
 762                 char *propname;
 763                 int i, tab_len, size;
 764
 765                 propname = kasprintf(GFP_KERNEL, "ocv-capacity-table-%d", index);
 766                 if (!propname) {
 767                         power_supply_put_battery_info(psy, info);
 768                         err = -ENOMEM;
 769                         goto out_put_node;
 770                 }
 771                 list = of_get_property(battery_np, propname, &size);
 772                 if (!list || !size) {
 773                         dev_err(&psy->dev, "failed to get %s\n", propname);
 774                         kfree(propname);
 775                         power_supply_put_battery_info(psy, info);
 776                         err = -EINVAL;
 777                         goto out_put_node;
 778                 }
 779
 780                 kfree(propname);
 781                 tab_len = size / (2 * sizeof(__be32));
 782                 info->ocv_table_size[index] = tab_len;
 783
 784                 table = info->ocv_table[index] =
 785                         devm_kcalloc(&psy->dev, tab_len, sizeof(*table), GFP_KERNEL);
 786                 if (!info->ocv_table[index]) {
 787                         power_supply_put_battery_info(psy, info);
 788                         err = -ENOMEM;
 789                         goto out_put_node;
 790                 }
 791
 792                 for (i = 0; i < tab_len; i++) {
 793                         table[i].ocv = be32_to_cpu(*list);
 794                         list++;
 795                         table[i].capacity = be32_to_cpu(*list);
 796                         list++;
 797                 }
 798         }
 799
 800         list = of_get_property(battery_np, "resistance-temp-table", &len);
 801         if (!list || !len)
 802                 goto out_ret_pointer;
 803
 804         info->resist_table_size = len / (2 * sizeof(__be32));
 805         resist_table = info->resist_table = devm_kcalloc(&psy->dev,
 806                                                          info->resist_table_size,
 807                                                          sizeof(*resist_table),
 808                                                          GFP_KERNEL);
 809         if (!info->resist_table) {
 810                 power_supply_put_battery_info(psy, info);
 811                 err = -ENOMEM;
 812                 goto out_put_node;
 813         }
 814
 815         for (index = 0; index < info->resist_table_size; index++) {
 816                 resist_table[index].temp = be32_to_cpu(*list++);
 817                 resist_table[index].resistance = be32_to_cpu(*list++);
 818         }
 819
 820 out_ret_pointer:
 821         /* Finally return the whole thing */
 822         *info_out = info;
 823
 824 out_put_node:
 825         fwnode_handle_put(fwnode);
 826         of_node_put(battery_np);
 827         return err;
 828 }
 829 EXPORT_SYMBOL_GPL(power_supply_get_battery_info);
 830
 831 void power_supply_put_battery_info(struct power_supply *psy,
 832                                    struct power_supply_battery_info *info)
 833 {
 834         int i;
 835
 836         for (i = 0; i < POWER_SUPPLY_OCV_TEMP_MAX; i++) {
 837                 if (info->ocv_table[i])
 838                         devm_kfree(&psy->dev, info->ocv_table[i]);
 839         }
 840
 841         if (info->resist_table)
 842                 devm_kfree(&psy->dev, info->resist_table);
 843
 844         devm_kfree(&psy->dev, info);
 845 }
 846 EXPORT_SYMBOL_GPL(power_supply_put_battery_info);
 847
 848 const enum power_supply_property power_supply_battery_info_properties[] = {
 849         POWER_SUPPLY_PROP_TECHNOLOGY,
 850         POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
 851         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 852         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 853         POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
 854         POWER_SUPPLY_PROP_PRECHARGE_CURRENT,
 855         POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT,
 856         POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
 857         POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
 858         POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MIN,
 859         POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MAX,
 860         POWER_SUPPLY_PROP_TEMP_ALERT_MIN,
 861         POWER_SUPPLY_PROP_TEMP_ALERT_MAX,
 862         POWER_SUPPLY_PROP_TEMP_MIN,
 863         POWER_SUPPLY_PROP_TEMP_MAX,
 864 };
 865 EXPORT_SYMBOL_GPL(power_supply_battery_info_properties);
 866
 867 const size_t power_supply_battery_info_properties_size = ARRAY_SIZE(power_supply_battery_info_properties);
 868 EXPORT_SYMBOL_GPL(power_supply_battery_info_properties_size);
 869
 870 bool power_supply_battery_info_has_prop(struct power_supply_battery_info *info,
 871                                         enum power_supply_property psp)
 872 {
 873         if (!info)
 874                 return false;
 875
 876         switch (psp) {
 877         case POWER_SUPPLY_PROP_TECHNOLOGY:
 878                 return info->technology != POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
 879         case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
 880                 return info->energy_full_design_uwh >= 0;
 881         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 882                 return info->charge_full_design_uah >= 0;
 883         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 884                 return info->voltage_min_design_uv >= 0;
 885         case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
 886                 return info->voltage_max_design_uv >= 0;
 887         case POWER_SUPPLY_PROP_PRECHARGE_CURRENT:
 888                 return info->precharge_current_ua >= 0;
 889         case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
 890                 return info->charge_term_current_ua >= 0;
 891         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
 892                 return info->constant_charge_current_max_ua >= 0;
 893         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
 894                 return info->constant_charge_voltage_max_uv >= 0;
 895         case POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MIN:
 896                 return info->temp_ambient_alert_min > INT_MIN;
 897         case POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MAX:
 898                 return info->temp_ambient_alert_max < INT_MAX;
 899         case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
 900                 return info->temp_alert_min > INT_MIN;
 901         case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
 902                 return info->temp_alert_max < INT_MAX;
 903         case POWER_SUPPLY_PROP_TEMP_MIN:
 904                 return info->temp_min > INT_MIN;
 905         case POWER_SUPPLY_PROP_TEMP_MAX:
 906                 return info->temp_max < INT_MAX;
 907         default:
 908                 return false;
 909         }
 910 }
 911 EXPORT_SYMBOL_GPL(power_supply_battery_info_has_prop);
 912
 913 int power_supply_battery_info_get_prop(struct power_supply_battery_info *info,
 914                                        enum power_supply_property psp,
 915                                        union power_supply_propval *val)
 916 {
 917         if (!info)
 918                 return -EINVAL;
 919
 920         if (!power_supply_battery_info_has_prop(info, psp))
 921                 return -EINVAL;
 922
 923         switch (psp) {
 924         case POWER_SUPPLY_PROP_TECHNOLOGY:
 925                 val->intval = info->technology;
 926                 return 0;
 927         case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
 928                 val->intval = info->energy_full_design_uwh;
 929                 return 0;
 930         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 931                 val->intval = info->charge_full_design_uah;
 932                 return 0;
 933         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 934                 val->intval = info->voltage_min_design_uv;
 935                 return 0;
 936         case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
 937                 val->intval = info->voltage_max_design_uv;
 938                 return 0;
 939         case POWER_SUPPLY_PROP_PRECHARGE_CURRENT:
 940                 val->intval = info->precharge_current_ua;
 941                 return 0;
 942         case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
 943                 val->intval = info->charge_term_current_ua;
 944                 return 0;
 945         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
 946                 val->intval = info->constant_charge_current_max_ua;
 947                 return 0;
 948         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
 949                 val->intval = info->constant_charge_voltage_max_uv;
 950                 return 0;
 951         case POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MIN:
 952                 val->intval = info->temp_ambient_alert_min;
 953                 return 0;
 954         case POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MAX:
 955                 val->intval = info->temp_ambient_alert_max;
 956                 return 0;
 957         case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
 958                 val->intval = info->temp_alert_min;
 959                 return 0;
 960         case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
 961                 val->intval = info->temp_alert_max;
 962                 return 0;
 963         case POWER_SUPPLY_PROP_TEMP_MIN:
 964                 val->intval = info->temp_min;
 965                 return 0;
 966         case POWER_SUPPLY_PROP_TEMP_MAX:
 967                 val->intval = info->temp_max;
 968                 return 0;
 969         default:
 970                 return -EINVAL;
 971         }
 972 }
 973 EXPORT_SYMBOL_GPL(power_supply_battery_info_get_prop);
 974
 975 /**
 976  * power_supply_temp2resist_simple() - find the battery internal resistance
 977  * percent from temperature
 978  * @table: Pointer to battery resistance temperature table
 979  * @table_len: The table length
 980  * @temp: Current temperature
 981  *
 982  * This helper function is used to look up battery internal resistance percent
 983  * according to current temperature value from the resistance temperature table,
 984  * and the table must be ordered descending. Then the actual battery internal
 985  * resistance = the ideal battery internal resistance * percent / 100.
 986  *
 987  * Return: the battery internal resistance percent
 988  */
 989 int power_supply_temp2resist_simple(struct power_supply_resistance_temp_table *table,
 990                                     int table_len, int temp)
 991 {
 992         int i, high, low;
 993
 994         for (i = 0; i < table_len; i++)
 995                 if (temp > table[i].temp)
 996                         break;
 997
 998         /* The library function will deal with high == low */
 999         if (i == 0)
1000                 high = low = i;
1001         else if (i == table_len)
1002                 high = low = i - 1;
1003         else
1004                 high = (low = i) - 1;
1005
1006         return fixp_linear_interpolate(table[low].temp,
1007                                        table[low].resistance,
1008                                        table[high].temp,
1009                                        table[high].resistance,
1010                                        temp);
1011 }
1012 EXPORT_SYMBOL_GPL(power_supply_temp2resist_simple);
1013
1014 /**
1015  * power_supply_vbat2ri() - find the battery internal resistance
1016  * from the battery voltage
1017  * @info: The battery information container
1018  * @vbat_uv: The battery voltage in microvolt
1019  * @charging: If we are charging (true) or not (false)
1020  *
1021  * This helper function is used to look up battery internal resistance
1022  * according to current battery voltage. Depending on whether the battery
1023  * is currently charging or not, different resistance will be returned.
1024  *
1025  * Returns the internal resistance in microohm or negative error code.
1026  */
1027 int power_supply_vbat2ri(struct power_supply_battery_info *info,
1028                          int vbat_uv, bool charging)
1029 {
1030         struct power_supply_vbat_ri_table *vbat2ri;
1031         int table_len;
1032         int i, high, low;
1033
1034         /*
1035          * If we are charging, and the battery supplies a separate table
1036          * for this state, we use that in order to compensate for the
1037          * charging voltage. Otherwise we use the main table.
1038          */
1039         if (charging && info->vbat2ri_charging) {
1040                 vbat2ri = info->vbat2ri_charging;
1041                 table_len = info->vbat2ri_charging_size;
1042         } else {
1043                 vbat2ri = info->vbat2ri_discharging;
1044                 table_len = info->vbat2ri_discharging_size;
1045         }
1046
1047         /*
1048          * If no tables are specified, or if we are above the highest voltage in
1049          * the voltage table, just return the factory specified internal resistance.
1050          */
1051         if (!vbat2ri || (table_len <= 0) || (vbat_uv > vbat2ri[0].vbat_uv)) {
1052                 if (charging && (info->factory_internal_resistance_charging_uohm > 0))
1053                         return info->factory_internal_resistance_charging_uohm;
1054                 else
1055                         return info->factory_internal_resistance_uohm;
1056         }
1057
1058         /* Break loop at table_len - 1 because that is the highest index */
1059         for (i = 0; i < table_len - 1; i++)
1060                 if (vbat_uv > vbat2ri[i].vbat_uv)
1061                         break;
1062
1063         /* The library function will deal with high == low */
1064         if ((i == 0) || (i == (table_len - 1)))
1065                 high = i;
1066         else
1067                 high = i - 1;
1068         low = i;
1069
1070         return fixp_linear_interpolate(vbat2ri[low].vbat_uv,
1071                                        vbat2ri[low].ri_uohm,
1072                                        vbat2ri[high].vbat_uv,
1073                                        vbat2ri[high].ri_uohm,
1074                                        vbat_uv);
1075 }
1076 EXPORT_SYMBOL_GPL(power_supply_vbat2ri);
1077
1078 struct power_supply_maintenance_charge_table *
1079 power_supply_get_maintenance_charging_setting(struct power_supply_battery_info *info,
1080                                               int index)
1081 {
1082         if (index >= info->maintenance_charge_size)
1083                 return NULL;
1084         return &info->maintenance_charge[index];
1085 }
1086 EXPORT_SYMBOL_GPL(power_supply_get_maintenance_charging_setting);
1087
1088 /**
1089  * power_supply_ocv2cap_simple() - find the battery capacity
1090  * @table: Pointer to battery OCV lookup table
1091  * @table_len: OCV table length
1092  * @ocv: Current OCV value
1093  *
1094  * This helper function is used to look up battery capacity according to
1095  * current OCV value from one OCV table, and the OCV table must be ordered
1096  * descending.
1097  *
1098  * Return: the battery capacity.
1099  */
1100 int power_supply_ocv2cap_simple(struct power_supply_battery_ocv_table *table,
1101                                 int table_len, int ocv)
1102 {
1103         int i, high, low;
1104
1105         for (i = 0; i < table_len; i++)
1106                 if (ocv > table[i].ocv)
1107                         break;
1108
1109         /* The library function will deal with high == low */
1110         if (i == 0)
1111                 high = low = i;
1112         else if (i == table_len)
1113                 high = low = i - 1;
1114         else
1115                 high = (low = i) - 1;
1116
1117         return fixp_linear_interpolate(table[low].ocv,
1118                                        table[low].capacity,
1119                                        table[high].ocv,
1120                                        table[high].capacity,
1121                                        ocv);
1122 }
1123 EXPORT_SYMBOL_GPL(power_supply_ocv2cap_simple);
1124
1125 struct power_supply_battery_ocv_table *
1126 power_supply_find_ocv2cap_table(struct power_supply_battery_info *info,
1127                                 int temp, int *table_len)
1128 {
1129         int best_temp_diff = INT_MAX, temp_diff;
1130         u8 i, best_index = 0;
1131
1132         if (!info->ocv_table[0])
1133                 return NULL;
1134
1135         for (i = 0; i < POWER_SUPPLY_OCV_TEMP_MAX; i++) {
1136                 /* Out of capacity tables */
1137                 if (!info->ocv_table[i])
1138                         break;
1139
1140                 temp_diff = abs(info->ocv_temp[i] - temp);
1141
1142                 if (temp_diff < best_temp_diff) {
1143                         best_temp_diff = temp_diff;
1144                         best_index = i;
1145                 }
1146         }
1147
1148         *table_len = info->ocv_table_size[best_index];
1149         return info->ocv_table[best_index];
1150 }
1151 EXPORT_SYMBOL_GPL(power_supply_find_ocv2cap_table);
1152
1153 int power_supply_batinfo_ocv2cap(struct power_supply_battery_info *info,
1154                                  int ocv, int temp)
1155 {
1156         struct power_supply_battery_ocv_table *table;
1157         int table_len;
1158
1159         table = power_supply_find_ocv2cap_table(info, temp, &table_len);
1160         if (!table)
1161                 return -EINVAL;
1162
1163         return power_supply_ocv2cap_simple(table, table_len, ocv);
1164 }
1165 EXPORT_SYMBOL_GPL(power_supply_batinfo_ocv2cap);
1166
1167 bool power_supply_battery_bti_in_range(struct power_supply_battery_info *info,
1168                                        int resistance)
1169 {
1170         int low, high;
1171
1172         /* Nothing like this can be checked */
1173         if (info->bti_resistance_ohm <= 0)
1174                 return false;
1175
1176         /* This will be extremely strict and unlikely to work */
1177         if (info->bti_resistance_tolerance <= 0)
1178                 return (info->bti_resistance_ohm == resistance);
1179
1180         low = info->bti_resistance_ohm -
1181                 (info->bti_resistance_ohm * info->bti_resistance_tolerance) / 100;
1182         high = info->bti_resistance_ohm +
1183                 (info->bti_resistance_ohm * info->bti_resistance_tolerance) / 100;
1184
1185         return ((resistance >= low) && (resistance <= high));
1186 }
1187 EXPORT_SYMBOL_GPL(power_supply_battery_bti_in_range);
1188
1189 static bool psy_has_property(const struct power_supply_desc *psy_desc,
1190                              enum power_supply_property psp)
1191 {
1192         bool found = false;
1193         int i;
1194
1195         for (i = 0; i < psy_desc->num_properties; i++) {
1196                 if (psy_desc->properties[i] == psp) {
1197                         found = true;
1198                         break;
1199                 }
1200         }
1201
1202         return found;
1203 }
1204
1205 int power_supply_get_property(struct power_supply *psy,
1206                             enum power_supply_property psp,
1207                             union power_supply_propval *val)
1208 {
1209         if (atomic_read(&psy->use_cnt) <= 0) {
1210                 if (!psy->initialized)
1211                         return -EAGAIN;
1212                 return -ENODEV;
1213         }
1214
1215         if (psy_has_property(psy->desc, psp))
1216                 return psy->desc->get_property(psy, psp, val);
1217         else if (power_supply_battery_info_has_prop(psy->battery_info, psp))
1218                 return power_supply_battery_info_get_prop(psy->battery_info, psp, val);
1219         else
1220                 return -EINVAL;
1221 }
1222 EXPORT_SYMBOL_GPL(power_supply_get_property);
1223
1224 int power_supply_set_property(struct power_supply *psy,
1225                             enum power_supply_property psp,
1226                             const union power_supply_propval *val)
1227 {
1228         if (atomic_read(&psy->use_cnt) <= 0 || !psy->desc->set_property)
1229                 return -ENODEV;
1230
1231         return psy->desc->set_property(psy, psp, val);
1232 }
1233 EXPORT_SYMBOL_GPL(power_supply_set_property);
1234
1235 int power_supply_property_is_writeable(struct power_supply *psy,
1236                                         enum power_supply_property psp)
1237 {
1238         if (atomic_read(&psy->use_cnt) <= 0 ||
1239                         !psy->desc->property_is_writeable)
1240                 return -ENODEV;
1241
1242         return psy->desc->property_is_writeable(psy, psp);
1243 }
1244 EXPORT_SYMBOL_GPL(power_supply_property_is_writeable);
1245
1246 void power_supply_external_power_changed(struct power_supply *psy)
1247 {
1248         if (atomic_read(&psy->use_cnt) <= 0 ||
1249                         !psy->desc->external_power_changed)
1250                 return;
1251
1252         psy->desc->external_power_changed(psy);
1253 }
1254 EXPORT_SYMBOL_GPL(power_supply_external_power_changed);
1255
1256 int power_supply_powers(struct power_supply *psy, struct device *dev)
1257 {
1258         return sysfs_create_link(&psy->dev.kobj, &dev->kobj, "powers");
1259 }
1260 EXPORT_SYMBOL_GPL(power_supply_powers);
1261
1262 static void power_supply_dev_release(struct device *dev)
1263 {
1264         struct power_supply *psy = to_power_supply(dev);
1265
1266         dev_dbg(dev, "%s\n", __func__);
1267         kfree(psy);
1268 }
1269
1270 int power_supply_reg_notifier(struct notifier_block *nb)
1271 {
1272         return blocking_notifier_chain_register(&power_supply_notifier, nb);
1273 }
1274 EXPORT_SYMBOL_GPL(power_supply_reg_notifier);
1275
1276 void power_supply_unreg_notifier(struct notifier_block *nb)
1277 {
1278         blocking_notifier_chain_unregister(&power_supply_notifier, nb);
1279 }
1280 EXPORT_SYMBOL_GPL(power_supply_unreg_notifier);
1281
1282 #ifdef CONFIG_THERMAL
1283 static int power_supply_read_temp(struct thermal_zone_device *tzd,
1284                 int *temp)
1285 {
1286         struct power_supply *psy;
1287         union power_supply_propval val;
1288         int ret;
1289
1290         WARN_ON(tzd == NULL);
1291         psy = thermal_zone_device_priv(tzd);
1292         ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_TEMP, &val);
1293         if (ret)
1294                 return ret;
1295
1296         /* Convert tenths of degree Celsius to milli degree Celsius. */
1297         *temp = val.intval * 100;
1298
1299         return ret;
1300 }
1301
1302 static struct thermal_zone_device_ops psy_tzd_ops = {
1303         .get_temp = power_supply_read_temp,
1304 };
1305
1306 static int psy_register_thermal(struct power_supply *psy)
1307 {
1308         int ret;
1309
1310         if (psy->desc->no_thermal)
1311                 return 0;
1312
1313         /* Register battery zone device psy reports temperature */
1314         if (psy_has_property(psy->desc, POWER_SUPPLY_PROP_TEMP)) {
1315                 /* Prefer our hwmon device and avoid duplicates */
1316                 struct thermal_zone_params tzp = {
1317                         .no_hwmon = IS_ENABLED(CONFIG_POWER_SUPPLY_HWMON)
1318                 };
1319                 psy->tzd = thermal_tripless_zone_device_register(psy->desc->name,
1320                                 psy, &psy_tzd_ops, &tzp);
1321                 if (IS_ERR(psy->tzd))
1322                         return PTR_ERR(psy->tzd);
1323                 ret = thermal_zone_device_enable(psy->tzd);
1324                 if (ret)
1325                         thermal_zone_device_unregister(psy->tzd);
1326                 return ret;
1327         }
1328
1329         return 0;
1330 }
1331
1332 static void psy_unregister_thermal(struct power_supply *psy)
1333 {
1334         if (IS_ERR_OR_NULL(psy->tzd))
1335                 return;
1336         thermal_zone_device_unregister(psy->tzd);
1337 }
1338
1339 #else
1340 static int psy_register_thermal(struct power_supply *psy)
1341 {
1342         return 0;
1343 }
1344
1345 static void psy_unregister_thermal(struct power_supply *psy)
1346 {
1347 }
1348 #endif
1349
1350 static struct power_supply *__must_check
1351 __power_supply_register(struct device *parent,
1352                                    const struct power_supply_desc *desc,
1353                                    const struct power_supply_config *cfg,
1354                                    bool ws)
1355 {
1356         struct device *dev;
1357         struct power_supply *psy;
1358         int rc;
1359
1360         if (!desc || !desc->name || !desc->properties || !desc->num_properties)
1361                 return ERR_PTR(-EINVAL);
1362
1363         if (!parent)
1364                 pr_warn("%s: Expected proper parent device for '%s'\n",
1365                         __func__, desc->name);
1366
1367         if (psy_has_property(desc, POWER_SUPPLY_PROP_USB_TYPE) &&
1368             (!desc->usb_types || !desc->num_usb_types))
1369                 return ERR_PTR(-EINVAL);
1370
1371         psy = kzalloc(sizeof(*psy), GFP_KERNEL);
1372         if (!psy)
1373                 return ERR_PTR(-ENOMEM);
1374
1375         dev = &psy->dev;
1376
1377         device_initialize(dev);
1378
1379         dev->class = &power_supply_class;
1380         dev->type = &power_supply_dev_type;
1381         dev->parent = parent;
1382         dev->release = power_supply_dev_release;
1383         dev_set_drvdata(dev, psy);
1384         psy->desc = desc;
1385         if (cfg) {
1386                 dev->groups = cfg->attr_grp;
1387                 psy->drv_data = cfg->drv_data;
1388                 psy->of_node =
1389                         cfg->fwnode ? to_of_node(cfg->fwnode) : cfg->of_node;
1390                 dev->of_node = psy->of_node;
1391                 psy->supplied_to = cfg->supplied_to;
1392                 psy->num_supplicants = cfg->num_supplicants;
1393         }
1394
1395         rc = dev_set_name(dev, "%s", desc->name);
1396         if (rc)
1397                 goto dev_set_name_failed;
1398
1399         INIT_WORK(&psy->changed_work, power_supply_changed_work);
1400         INIT_DELAYED_WORK(&psy->deferred_register_work,
1401                           power_supply_deferred_register_work);
1402
1403         rc = power_supply_check_supplies(psy);
1404         if (rc) {
1405                 dev_dbg(dev, "Not all required supplies found, defer probe\n");
1406                 goto check_supplies_failed;
1407         }
1408
1409         /*
1410          * Expose constant battery info, if it is available. While there are
1411          * some chargers accessing constant battery data, we only want to
1412          * expose battery data to userspace for battery devices.
1413          */
1414         if (desc->type == POWER_SUPPLY_TYPE_BATTERY) {
1415                 rc = power_supply_get_battery_info(psy, &psy->battery_info);
1416                 if (rc && rc != -ENODEV && rc != -ENOENT)
1417                         goto check_supplies_failed;
1418         }
1419
1420         spin_lock_init(&psy->changed_lock);
1421         rc = device_add(dev);
1422         if (rc)
1423                 goto device_add_failed;
1424
1425         rc = device_init_wakeup(dev, ws);
1426         if (rc)
1427                 goto wakeup_init_failed;
1428
1429         rc = psy_register_thermal(psy);
1430         if (rc)
1431                 goto register_thermal_failed;
1432
1433         rc = power_supply_create_triggers(psy);
1434         if (rc)
1435                 goto create_triggers_failed;
1436
1437         rc = power_supply_add_hwmon_sysfs(psy);
1438         if (rc)
1439                 goto add_hwmon_sysfs_failed;
1440
1441         /*
1442          * Update use_cnt after any uevents (most notably from device_add()).
1443          * We are here still during driver's probe but
1444          * the power_supply_uevent() calls back driver's get_property
1445          * method so:
1446          * 1. Driver did not assigned the returned struct power_supply,
1447          * 2. Driver could not finish initialization (anything in its probe
1448          *    after calling power_supply_register()).
1449          */
1450         atomic_inc(&psy->use_cnt);
1451         psy->initialized = true;
1452
1453         queue_delayed_work(system_power_efficient_wq,
1454                            &psy->deferred_register_work,
1455                            POWER_SUPPLY_DEFERRED_REGISTER_TIME);
1456
1457         return psy;
1458
1459 add_hwmon_sysfs_failed:
1460         power_supply_remove_triggers(psy);
1461 create_triggers_failed:
1462         psy_unregister_thermal(psy);
1463 register_thermal_failed:
1464 wakeup_init_failed:
1465         device_del(dev);
1466 device_add_failed:
1467 check_supplies_failed:
1468 dev_set_name_failed:
1469         put_device(dev);
1470         return ERR_PTR(rc);
1471 }
1472
1473 /**
1474  * power_supply_register() - Register new power supply
1475  * @parent:     Device to be a parent of power supply's device, usually
1476  *              the device which probe function calls this
1477  * @desc:       Description of power supply, must be valid through whole
1478  *              lifetime of this power supply
1479  * @cfg:        Run-time specific configuration accessed during registering,
1480  *              may be NULL
1481  *
1482  * Return: A pointer to newly allocated power_supply on success
1483  * or ERR_PTR otherwise.
1484  * Use power_supply_unregister() on returned power_supply pointer to release
1485  * resources.
1486  */
1487 struct power_supply *__must_check power_supply_register(struct device *parent,
1488                 const struct power_supply_desc *desc,
1489                 const struct power_supply_config *cfg)
1490 {
1491         return __power_supply_register(parent, desc, cfg, true);
1492 }
1493 EXPORT_SYMBOL_GPL(power_supply_register);
1494
1495 /**
1496  * power_supply_register_no_ws() - Register new non-waking-source power supply
1497  * @parent:     Device to be a parent of power supply's device, usually
1498  *              the device which probe function calls this
1499  * @desc:       Description of power supply, must be valid through whole
1500  *              lifetime of this power supply
1501  * @cfg:        Run-time specific configuration accessed during registering,
1502  *              may be NULL
1503  *
1504  * Return: A pointer to newly allocated power_supply on success
1505  * or ERR_PTR otherwise.
1506  * Use power_supply_unregister() on returned power_supply pointer to release
1507  * resources.
1508  */
1509 struct power_supply *__must_check
1510 power_supply_register_no_ws(struct device *parent,
1511                 const struct power_supply_desc *desc,
1512                 const struct power_supply_config *cfg)
1513 {
1514         return __power_supply_register(parent, desc, cfg, false);
1515 }
1516 EXPORT_SYMBOL_GPL(power_supply_register_no_ws);
1517
1518 static void devm_power_supply_release(struct device *dev, void *res)
1519 {
1520         struct power_supply **psy = res;
1521
1522         power_supply_unregister(*psy);
1523 }
1524
1525 /**
1526  * devm_power_supply_register() - Register managed power supply
1527  * @parent:     Device to be a parent of power supply's device, usually
1528  *              the device which probe function calls this
1529  * @desc:       Description of power supply, must be valid through whole
1530  *              lifetime of this power supply
1531  * @cfg:        Run-time specific configuration accessed during registering,
1532  *              may be NULL
1533  *
1534  * Return: A pointer to newly allocated power_supply on success
1535  * or ERR_PTR otherwise.
1536  * The returned power_supply pointer will be automatically unregistered
1537  * on driver detach.
1538  */
1539 struct power_supply *__must_check
1540 devm_power_supply_register(struct device *parent,
1541                 const struct power_supply_desc *desc,
1542                 const struct power_supply_config *cfg)
1543 {
1544         struct power_supply **ptr, *psy;
1545
1546         ptr = devres_alloc(devm_power_supply_release, sizeof(*ptr), GFP_KERNEL);
1547
1548         if (!ptr)
1549                 return ERR_PTR(-ENOMEM);
1550         psy = __power_supply_register(parent, desc, cfg, true);
1551         if (IS_ERR(psy)) {
1552                 devres_free(ptr);
1553         } else {
1554                 *ptr = psy;
1555                 devres_add(parent, ptr);
1556         }
1557         return psy;
1558 }
1559 EXPORT_SYMBOL_GPL(devm_power_supply_register);
1560
1561 /**
1562  * devm_power_supply_register_no_ws() - Register managed non-waking-source power supply
1563  * @parent:     Device to be a parent of power supply's device, usually
1564  *              the device which probe function calls this
1565  * @desc:       Description of power supply, must be valid through whole
1566  *              lifetime of this power supply
1567  * @cfg:        Run-time specific configuration accessed during registering,
1568  *              may be NULL
1569  *
1570  * Return: A pointer to newly allocated power_supply on success
1571  * or ERR_PTR otherwise.
1572  * The returned power_supply pointer will be automatically unregistered
1573  * on driver detach.
1574  */
1575 struct power_supply *__must_check
1576 devm_power_supply_register_no_ws(struct device *parent,
1577                 const struct power_supply_desc *desc,
1578                 const struct power_supply_config *cfg)
1579 {
1580         struct power_supply **ptr, *psy;
1581
1582         ptr = devres_alloc(devm_power_supply_release, sizeof(*ptr), GFP_KERNEL);
1583
1584         if (!ptr)
1585                 return ERR_PTR(-ENOMEM);
1586         psy = __power_supply_register(parent, desc, cfg, false);
1587         if (IS_ERR(psy)) {
1588                 devres_free(ptr);
1589         } else {
1590                 *ptr = psy;
1591                 devres_add(parent, ptr);
1592         }
1593         return psy;
1594 }
1595 EXPORT_SYMBOL_GPL(devm_power_supply_register_no_ws);
1596
1597 /**
1598  * power_supply_unregister() - Remove this power supply from system
1599  * @psy:        Pointer to power supply to unregister
1600  *
1601  * Remove this power supply from the system. The resources of power supply
1602  * will be freed here or on last power_supply_put() call.
1603  */
1604 void power_supply_unregister(struct power_supply *psy)
1605 {
1606         WARN_ON(atomic_dec_return(&psy->use_cnt));
1607         psy->removing = true;
1608         cancel_work_sync(&psy->changed_work);
1609         cancel_delayed_work_sync(&psy->deferred_register_work);
1610         sysfs_remove_link(&psy->dev.kobj, "powers");
1611         power_supply_remove_hwmon_sysfs(psy);
1612         power_supply_remove_triggers(psy);
1613         psy_unregister_thermal(psy);
1614         device_init_wakeup(&psy->dev, false);
1615         device_unregister(&psy->dev);
1616 }
1617 EXPORT_SYMBOL_GPL(power_supply_unregister);
1618
1619 void *power_supply_get_drvdata(struct power_supply *psy)
1620 {
1621         return psy->drv_data;
1622 }
1623 EXPORT_SYMBOL_GPL(power_supply_get_drvdata);
1624
1625 static int __init power_supply_class_init(void)
1626 {
1627         int err;
1628
1629         err = class_register(&power_supply_class);
1630         if (err)
1631                 return err;
1632
1633         power_supply_init_attrs();
1634
1635         return 0;
1636 }
1637
1638 static void __exit power_supply_class_exit(void)
1639 {
1640         class_unregister(&power_supply_class);
1641 }
1642
1643 subsys_initcall(power_supply_class_init);
1644 module_exit(power_supply_class_exit);
1645
1646 MODULE_DESCRIPTION("Universal power supply monitor class");
1647 MODULE_AUTHOR("Ian Molton <spyro@f2s.com>");
1648 MODULE_AUTHOR("Szabolcs Gyurko");
1649 MODULE_AUTHOR("Anton Vorontsov <cbou@mail.ru>");