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