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 static BLOCKING_NOTIFIER_HEAD(power_supply_notifier);
  33
  34 static struct device_type power_supply_dev_type;
  35
  36 #define POWER_SUPPLY_DEFERRED_REGISTER_TIME     msecs_to_jiffies(10)
  37
  38 static bool __power_supply_is_supplied_by(struct power_supply *supplier,
  39                                          struct power_supply *supply)
  40 {
  41         int i;
  42
  43         if (!supply->supplied_from && !supplier->supplied_to)
  44                 return false;
  45
  46         /* Support both supplied_to and supplied_from modes */
  47         if (supply->supplied_from) {
  48                 if (!supplier->desc->name)
  49                         return false;
  50                 for (i = 0; i < supply->num_supplies; i++)
  51                         if (!strcmp(supplier->desc->name, supply->supplied_from[i]))
  52                                 return true;
  53         } else {
  54                 if (!supply->desc->name)
  55                         return false;
  56                 for (i = 0; i < supplier->num_supplicants; i++)
  57                         if (!strcmp(supplier->supplied_to[i], supply->desc->name))
  58                                 return true;
  59         }
  60
  61         return false;
  62 }
  63
  64 static int __power_supply_changed_work(struct device *dev, void *data)
  65 {
  66         struct power_supply *psy = data;
  67         struct power_supply *pst = dev_get_drvdata(dev);
  68
  69         if (__power_supply_is_supplied_by(psy, pst)) {
  70                 if (pst->desc->external_power_changed)
  71                         pst->desc->external_power_changed(pst);
  72         }
  73
  74         return 0;
  75 }
  76
  77 static void power_supply_changed_work(struct work_struct *work)
  78 {
  79         unsigned long flags;
  80         struct power_supply *psy = container_of(work, struct power_supply,
  81                                                 changed_work);
  82
  83         dev_dbg(&psy->dev, "%s\n", __func__);
  84
  85         spin_lock_irqsave(&psy->changed_lock, flags);
  86         /*
  87          * Check 'changed' here to avoid issues due to race between
  88          * power_supply_changed() and this routine. In worst case
  89          * power_supply_changed() can be called again just before we take above
  90          * lock. During the first call of this routine we will mark 'changed' as
  91          * false and it will stay false for the next call as well.
  92          */
  93         if (likely(psy->changed)) {
  94                 psy->changed = false;
  95                 spin_unlock_irqrestore(&psy->changed_lock, flags);
  96                 class_for_each_device(power_supply_class, NULL, psy,
  97                                       __power_supply_changed_work);
  98                 power_supply_update_leds(psy);
  99                 blocking_notifier_call_chain(&power_supply_notifier,
 100                                 PSY_EVENT_PROP_CHANGED, psy);
 101                 kobject_uevent(&psy->dev.kobj, KOBJ_CHANGE);
 102                 spin_lock_irqsave(&psy->changed_lock, flags);
 103         }
 104
 105         /*
 106          * Hold the wakeup_source until all events are processed.
 107          * power_supply_changed() might have called again and have set 'changed'
 108          * to true.
 109          */
 110         if (likely(!psy->changed))
 111                 pm_relax(&psy->dev);
 112         spin_unlock_irqrestore(&psy->changed_lock, flags);
 113 }
 114
 115 void power_supply_changed(struct power_supply *psy)
 116 {
 117         unsigned long flags;
 118
 119         dev_dbg(&psy->dev, "%s\n", __func__);
 120
 121         spin_lock_irqsave(&psy->changed_lock, flags);
 122         psy->changed = true;
 123         pm_stay_awake(&psy->dev);
 124         spin_unlock_irqrestore(&psy->changed_lock, flags);
 125         schedule_work(&psy->changed_work);
 126 }
 127 EXPORT_SYMBOL_GPL(power_supply_changed);
 128
 129 /*
 130  * Notify that power supply was registered after parent finished the probing.
 131  *
 132  * Often power supply is registered from driver's probe function. However
 133  * calling power_supply_changed() directly from power_supply_register()
 134  * would lead to execution of get_property() function provided by the driver
 135  * too early - before the probe ends.
 136  *
 137  * Avoid that by waiting on parent's mutex.
 138  */
 139 static void power_supply_deferred_register_work(struct work_struct *work)
 140 {
 141         struct power_supply *psy = container_of(work, struct power_supply,
 142                                                 deferred_register_work.work);
 143
 144         if (psy->dev.parent) {
 145                 while (!mutex_trylock(&psy->dev.parent->mutex)) {
 146                         if (psy->removing)
 147                                 return;
 148                         msleep(10);
 149                 }
 150         }
 151
 152         power_supply_changed(psy);
 153
 154         if (psy->dev.parent)
 155                 mutex_unlock(&psy->dev.parent->mutex);
 156 }
 157
 158 #ifdef CONFIG_OF
 159 static int __power_supply_populate_supplied_from(struct device *dev,
 160                                                  void *data)
 161 {
 162         struct power_supply *psy = data;
 163         struct power_supply *epsy = dev_get_drvdata(dev);
 164         struct device_node *np;
 165         int i = 0;
 166
 167         do {
 168                 np = of_parse_phandle(psy->of_node, "power-supplies", i++);
 169                 if (!np)
 170                         break;
 171
 172                 if (np == epsy->of_node) {
 173                         dev_dbg(&psy->dev, "%s: Found supply : %s\n",
 174                                 psy->desc->name, epsy->desc->name);
 175                         psy->supplied_from[i-1] = (char *)epsy->desc->name;
 176                         psy->num_supplies++;
 177                         of_node_put(np);
 178                         break;
 179                 }
 180                 of_node_put(np);
 181         } while (np);
 182
 183         return 0;
 184 }
 185
 186 static int power_supply_populate_supplied_from(struct power_supply *psy)
 187 {
 188         int error;
 189
 190         error = class_for_each_device(power_supply_class, NULL, psy,
 191                                       __power_supply_populate_supplied_from);
 192
 193         dev_dbg(&psy->dev, "%s %d\n", __func__, error);
 194
 195         return error;
 196 }
 197
 198 static int  __power_supply_find_supply_from_node(struct device *dev,
 199                                                  void *data)
 200 {
 201         struct device_node *np = data;
 202         struct power_supply *epsy = dev_get_drvdata(dev);
 203
 204         /* returning non-zero breaks out of class_for_each_device loop */
 205         if (epsy->of_node == np)
 206                 return 1;
 207
 208         return 0;
 209 }
 210
 211 static int power_supply_find_supply_from_node(struct device_node *supply_node)
 212 {
 213         int error;
 214
 215         /*
 216          * class_for_each_device() either returns its own errors or values
 217          * returned by __power_supply_find_supply_from_node().
 218          *
 219          * __power_supply_find_supply_from_node() will return 0 (no match)
 220          * or 1 (match).
 221          *
 222          * We return 0 if class_for_each_device() returned 1, -EPROBE_DEFER if
 223          * it returned 0, or error as returned by it.
 224          */
 225         error = class_for_each_device(power_supply_class, NULL, supply_node,
 226                                        __power_supply_find_supply_from_node);
 227
 228         return error ? (error == 1 ? 0 : error) : -EPROBE_DEFER;
 229 }
 230
 231 static int power_supply_check_supplies(struct power_supply *psy)
 232 {
 233         struct device_node *np;
 234         int cnt = 0;
 235
 236         /* If there is already a list honor it */
 237         if (psy->supplied_from && psy->num_supplies > 0)
 238                 return 0;
 239
 240         /* No device node found, nothing to do */
 241         if (!psy->of_node)
 242                 return 0;
 243
 244         do {
 245                 int ret;
 246
 247                 np = of_parse_phandle(psy->of_node, "power-supplies", cnt++);
 248                 if (!np)
 249                         break;
 250
 251                 ret = power_supply_find_supply_from_node(np);
 252                 of_node_put(np);
 253
 254                 if (ret) {
 255                         dev_dbg(&psy->dev, "Failed to find supply!\n");
 256                         return ret;
 257                 }
 258         } while (np);
 259
 260         /* Missing valid "power-supplies" entries */
 261         if (cnt == 1)
 262                 return 0;
 263
 264         /* All supplies found, allocate char ** array for filling */
 265         psy->supplied_from = devm_kzalloc(&psy->dev, sizeof(*psy->supplied_from),
 266                                           GFP_KERNEL);
 267         if (!psy->supplied_from)
 268                 return -ENOMEM;
 269
 270         *psy->supplied_from = devm_kcalloc(&psy->dev,
 271                                            cnt - 1, sizeof(**psy->supplied_from),
 272                                            GFP_KERNEL);
 273         if (!*psy->supplied_from)
 274                 return -ENOMEM;
 275
 276         return power_supply_populate_supplied_from(psy);
 277 }
 278 #else
 279 static int power_supply_check_supplies(struct power_supply *psy)
 280 {
 281         int nval, ret;
 282
 283         if (!psy->dev.parent)
 284                 return 0;
 285
 286         nval = device_property_string_array_count(psy->dev.parent, "supplied-from");
 287         if (nval <= 0)
 288                 return 0;
 289
 290         psy->supplied_from = devm_kmalloc_array(&psy->dev, nval,
 291                                                 sizeof(char *), GFP_KERNEL);
 292         if (!psy->supplied_from)
 293                 return -ENOMEM;
 294
 295         ret = device_property_read_string_array(psy->dev.parent,
 296                 "supplied-from", (const char **)psy->supplied_from, nval);
 297         if (ret < 0)
 298                 return ret;
 299
 300         psy->num_supplies = nval;
 301
 302         return 0;
 303 }
 304 #endif
 305
 306 struct psy_am_i_supplied_data {
 307         struct power_supply *psy;
 308         unsigned int count;
 309 };
 310
 311 static int __power_supply_am_i_supplied(struct device *dev, void *_data)
 312 {
 313         union power_supply_propval ret = {0,};
 314         struct power_supply *epsy = dev_get_drvdata(dev);
 315         struct psy_am_i_supplied_data *data = _data;
 316
 317         if (__power_supply_is_supplied_by(epsy, data->psy)) {
 318                 data->count++;
 319                 if (!epsy->desc->get_property(epsy, POWER_SUPPLY_PROP_ONLINE,
 320                                         &ret))
 321                         return ret.intval;
 322         }
 323
 324         return 0;
 325 }
 326
 327 int power_supply_am_i_supplied(struct power_supply *psy)
 328 {
 329         struct psy_am_i_supplied_data data = { psy, 0 };
 330         int error;
 331
 332         error = class_for_each_device(power_supply_class, NULL, &data,
 333                                       __power_supply_am_i_supplied);
 334
 335         dev_dbg(&psy->dev, "%s count %u err %d\n", __func__, data.count, error);
 336
 337         if (data.count == 0)
 338                 return -ENODEV;
 339
 340         return error;
 341 }
 342 EXPORT_SYMBOL_GPL(power_supply_am_i_supplied);
 343
 344 static int __power_supply_is_system_supplied(struct device *dev, void *data)
 345 {
 346         union power_supply_propval ret = {0,};
 347         struct power_supply *psy = dev_get_drvdata(dev);
 348         unsigned int *count = data;
 349
 350         if (!psy->desc->get_property(psy, POWER_SUPPLY_PROP_SCOPE, &ret))
 351                 if (ret.intval == POWER_SUPPLY_SCOPE_DEVICE)
 352                         return 0;
 353
 354         (*count)++;
 355         if (psy->desc->type != POWER_SUPPLY_TYPE_BATTERY)
 356                 if (!psy->desc->get_property(psy, POWER_SUPPLY_PROP_ONLINE,
 357                                         &ret))
 358                         return ret.intval;
 359
 360         return 0;
 361 }
 362
 363 int power_supply_is_system_supplied(void)
 364 {
 365         int error;
 366         unsigned int count = 0;
 367
 368         error = class_for_each_device(power_supply_class, NULL, &count,
 369                                       __power_supply_is_system_supplied);
 370
 371         /*
 372          * If no system scope power class device was found at all, most probably we
 373          * are running on a desktop system, so assume we are on mains power.
 374          */
 375         if (count == 0)
 376                 return 1;
 377
 378         return error;
 379 }
 380 EXPORT_SYMBOL_GPL(power_supply_is_system_supplied);
 381
 382 struct psy_get_supplier_prop_data {
 383         struct power_supply *psy;
 384         enum power_supply_property psp;
 385         union power_supply_propval *val;
 386 };
 387
 388 static int __power_supply_get_supplier_property(struct device *dev, void *_data)
 389 {
 390         struct power_supply *epsy = dev_get_drvdata(dev);
 391         struct psy_get_supplier_prop_data *data = _data;
 392
 393         if (__power_supply_is_supplied_by(epsy, data->psy))
 394                 if (!power_supply_get_property(epsy, data->psp, data->val))
 395                         return 1; /* Success */
 396
 397         return 0; /* Continue iterating */
 398 }
 399
 400 int power_supply_get_property_from_supplier(struct power_supply *psy,
 401                                             enum power_supply_property psp,
 402                                             union power_supply_propval *val)
 403 {
 404         struct psy_get_supplier_prop_data data = {
 405                 .psy = psy,
 406                 .psp = psp,
 407                 .val = val,
 408         };
 409         int ret;
 410
 411         /*
 412          * This function is not intended for use with a supply with multiple
 413          * suppliers, we simply pick the first supply to report the psp.
 414          */
 415         ret = class_for_each_device(power_supply_class, NULL, &data,
 416                                     __power_supply_get_supplier_property);
 417         if (ret < 0)
 418                 return ret;
 419         if (ret == 0)
 420                 return -ENODEV;
 421
 422         return 0;
 423 }
 424 EXPORT_SYMBOL_GPL(power_supply_get_property_from_supplier);
 425
 426 int power_supply_set_battery_charged(struct power_supply *psy)
 427 {
 428         if (atomic_read(&psy->use_cnt) >= 0 &&
 429                         psy->desc->type == POWER_SUPPLY_TYPE_BATTERY &&
 430                         psy->desc->set_charged) {
 431                 psy->desc->set_charged(psy);
 432                 return 0;
 433         }
 434
 435         return -EINVAL;
 436 }
 437 EXPORT_SYMBOL_GPL(power_supply_set_battery_charged);
 438
 439 static int power_supply_match_device_by_name(struct device *dev, const void *data)
 440 {
 441         const char *name = data;
 442         struct power_supply *psy = dev_get_drvdata(dev);
 443
 444         return strcmp(psy->desc->name, name) == 0;
 445 }
 446
 447 /**
 448  * power_supply_get_by_name() - Search for a power supply and returns its ref
 449  * @name: Power supply name to fetch
 450  *
 451  * If power supply was found, it increases reference count for the
 452  * internal power supply's device. The user should power_supply_put()
 453  * after usage.
 454  *
 455  * Return: On success returns a reference to a power supply with
 456  * matching name equals to @name, a NULL otherwise.
 457  */
 458 struct power_supply *power_supply_get_by_name(const char *name)
 459 {
 460         struct power_supply *psy = NULL;
 461         struct device *dev = class_find_device(power_supply_class, NULL, name,
 462                                         power_supply_match_device_by_name);
 463
 464         if (dev) {
 465                 psy = dev_get_drvdata(dev);
 466                 atomic_inc(&psy->use_cnt);
 467         }
 468
 469         return psy;
 470 }
 471 EXPORT_SYMBOL_GPL(power_supply_get_by_name);
 472
 473 /**
 474  * power_supply_put() - Drop reference obtained with power_supply_get_by_name
 475  * @psy: Reference to put
 476  *
 477  * The reference to power supply should be put before unregistering
 478  * the power supply.
 479  */
 480 void power_supply_put(struct power_supply *psy)
 481 {
 482         might_sleep();
 483
 484         atomic_dec(&psy->use_cnt);
 485         put_device(&psy->dev);
 486 }
 487 EXPORT_SYMBOL_GPL(power_supply_put);
 488
 489 #ifdef CONFIG_OF
 490 static int power_supply_match_device_node(struct device *dev, const void *data)
 491 {
 492         return dev->parent && dev->parent->of_node == data;
 493 }
 494
 495 /**
 496  * power_supply_get_by_phandle() - Search for a power supply and returns its ref
 497  * @np: Pointer to device node holding phandle property
 498  * @property: Name of property holding a power supply name
 499  *
 500  * If power supply was found, it increases reference count for the
 501  * internal power supply's device. The user should power_supply_put()
 502  * after usage.
 503  *
 504  * Return: On success returns a reference to a power supply with
 505  * matching name equals to value under @property, NULL or ERR_PTR otherwise.
 506  */
 507 struct power_supply *power_supply_get_by_phandle(struct device_node *np,
 508                                                         const char *property)
 509 {
 510         struct device_node *power_supply_np;
 511         struct power_supply *psy = NULL;
 512         struct device *dev;
 513
 514         power_supply_np = of_parse_phandle(np, property, 0);
 515         if (!power_supply_np)
 516                 return ERR_PTR(-ENODEV);
 517
 518         dev = class_find_device(power_supply_class, NULL, power_supply_np,
 519                                                 power_supply_match_device_node);
 520
 521         of_node_put(power_supply_np);
 522
 523         if (dev) {
 524                 psy = dev_get_drvdata(dev);
 525                 atomic_inc(&psy->use_cnt);
 526         }
 527
 528         return psy;
 529 }
 530 EXPORT_SYMBOL_GPL(power_supply_get_by_phandle);
 531
 532 static void devm_power_supply_put(struct device *dev, void *res)
 533 {
 534         struct power_supply **psy = res;
 535
 536         power_supply_put(*psy);
 537 }
 538
 539 /**
 540  * devm_power_supply_get_by_phandle() - Resource managed version of
 541  *  power_supply_get_by_phandle()
 542  * @dev: Pointer to device holding phandle property
 543  * @property: Name of property holding a power supply phandle
 544  *
 545  * Return: On success returns a reference to a power supply with
 546  * matching name equals to value under @property, NULL or ERR_PTR otherwise.
 547  */
 548 struct power_supply *devm_power_supply_get_by_phandle(struct device *dev,
 549                                                       const char *property)
 550 {
 551         struct power_supply **ptr, *psy;
 552
 553         if (!dev->of_node)
 554                 return ERR_PTR(-ENODEV);
 555
 556         ptr = devres_alloc(devm_power_supply_put, sizeof(*ptr), GFP_KERNEL);
 557         if (!ptr)
 558                 return ERR_PTR(-ENOMEM);
 559
 560         psy = power_supply_get_by_phandle(dev->of_node, property);
 561         if (IS_ERR_OR_NULL(psy)) {
 562                 devres_free(ptr);
 563         } else {
 564                 *ptr = psy;
 565                 devres_add(dev, ptr);
 566         }
 567         return psy;
 568 }
 569 EXPORT_SYMBOL_GPL(devm_power_supply_get_by_phandle);
 570 #endif /* CONFIG_OF */
 571
 572 int power_supply_get_battery_info(struct power_supply *psy,
 573                                   struct power_supply_battery_info **info_out)
 574 {
 575         struct power_supply_resistance_temp_table *resist_table;
 576         struct power_supply_battery_info *info;
 577         struct device_node *battery_np = NULL;
 578         struct fwnode_reference_args args;
 579         struct fwnode_handle *fwnode = NULL;
 580         const char *value;
 581         int err, len, index;
 582         const __be32 *list;
 583         u32 min_max[2];
 584
 585         if (psy->of_node) {
 586                 battery_np = of_parse_phandle(psy->of_node, "monitored-battery", 0);
 587                 if (!battery_np)
 588                         return -ENODEV;
 589
 590                 fwnode = fwnode_handle_get(of_fwnode_handle(battery_np));
 591         } else if (psy->dev.parent) {
 592                 err = fwnode_property_get_reference_args(
 593                                         dev_fwnode(psy->dev.parent),
 594                                         "monitored-battery", NULL, 0, 0, &args);
 595                 if (err)
 596                         return err;
 597
 598                 fwnode = args.fwnode;
 599         }
 600
 601         if (!fwnode)
 602                 return -ENOENT;
 603
 604         err = fwnode_property_read_string(fwnode, "compatible", &value);
 605         if (err)
 606                 goto out_put_node;
 607
 608
 609         /* Try static batteries first */
 610         err = samsung_sdi_battery_get_info(&psy->dev, value, &info);
 611         if (!err)
 612                 goto out_ret_pointer;
 613         else if (err == -ENODEV)
 614                 /*
 615                  * Device does not have a static battery.
 616                  * Proceed to look for a simple battery.
 617                  */
 618                 err = 0;
 619
 620         if (strcmp("simple-battery", value)) {
 621                 err = -ENODEV;
 622                 goto out_put_node;
 623         }
 624
 625         info = devm_kzalloc(&psy->dev, sizeof(*info), GFP_KERNEL);
 626         if (!info) {
 627                 err = -ENOMEM;
 628                 goto out_put_node;
 629         }
 630
 631         info->technology                     = POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
 632         info->energy_full_design_uwh         = -EINVAL;
 633         info->charge_full_design_uah         = -EINVAL;
 634         info->voltage_min_design_uv          = -EINVAL;
 635         info->voltage_max_design_uv          = -EINVAL;
 636         info->precharge_current_ua           = -EINVAL;
 637         info->charge_term_current_ua         = -EINVAL;
 638         info->constant_charge_current_max_ua = -EINVAL;
 639         info->constant_charge_voltage_max_uv = -EINVAL;
 640         info->tricklecharge_current_ua       = -EINVAL;
 641         info->precharge_voltage_max_uv       = -EINVAL;
 642         info->charge_restart_voltage_uv      = -EINVAL;
 643         info->overvoltage_limit_uv           = -EINVAL;
 644         info->maintenance_charge             = NULL;
 645         info->alert_low_temp_charge_current_ua = -EINVAL;
 646         info->alert_low_temp_charge_voltage_uv = -EINVAL;
 647         info->alert_high_temp_charge_current_ua = -EINVAL;
 648         info->alert_high_temp_charge_voltage_uv = -EINVAL;
 649         info->temp_ambient_alert_min         = INT_MIN;
 650         info->temp_ambient_alert_max         = INT_MAX;
 651         info->temp_alert_min                 = INT_MIN;
 652         info->temp_alert_max                 = INT_MAX;
 653         info->temp_min                       = INT_MIN;
 654         info->temp_max                       = INT_MAX;
 655         info->factory_internal_resistance_uohm  = -EINVAL;
 656         info->resist_table                   = NULL;
 657         info->bti_resistance_ohm             = -EINVAL;
 658         info->bti_resistance_tolerance       = -EINVAL;
 659
 660         for (index = 0; index < POWER_SUPPLY_OCV_TEMP_MAX; index++) {
 661                 info->ocv_table[index]       = NULL;
 662                 info->ocv_temp[index]        = -EINVAL;
 663                 info->ocv_table_size[index]  = -EINVAL;
 664         }
 665
 666         /* The property and field names below must correspond to elements
 667          * in enum power_supply_property. For reasoning, see
 668          * Documentation/power/power_supply_class.rst.
 669          */
 670
 671         if (!fwnode_property_read_string(fwnode, "device-chemistry", &value)) {
 672                 if (!strcmp("nickel-cadmium", value))
 673                         info->technology = POWER_SUPPLY_TECHNOLOGY_NiCd;
 674                 else if (!strcmp("nickel-metal-hydride", value))
 675                         info->technology = POWER_SUPPLY_TECHNOLOGY_NiMH;
 676                 else if (!strcmp("lithium-ion", value))
 677                         /* Imprecise lithium-ion type */
 678                         info->technology = POWER_SUPPLY_TECHNOLOGY_LION;
 679                 else if (!strcmp("lithium-ion-polymer", value))
 680                         info->technology = POWER_SUPPLY_TECHNOLOGY_LIPO;
 681                 else if (!strcmp("lithium-ion-iron-phosphate", value))
 682                         info->technology = POWER_SUPPLY_TECHNOLOGY_LiFe;
 683                 else if (!strcmp("lithium-ion-manganese-oxide", value))
 684                         info->technology = POWER_SUPPLY_TECHNOLOGY_LiMn;
 685                 else
 686                         dev_warn(&psy->dev, "%s unknown battery type\n", value);
 687         }
 688
 689         fwnode_property_read_u32(fwnode, "energy-full-design-microwatt-hours",
 690                              &info->energy_full_design_uwh);
 691         fwnode_property_read_u32(fwnode, "charge-full-design-microamp-hours",
 692                              &info->charge_full_design_uah);
 693         fwnode_property_read_u32(fwnode, "voltage-min-design-microvolt",
 694                              &info->voltage_min_design_uv);
 695         fwnode_property_read_u32(fwnode, "voltage-max-design-microvolt",
 696                              &info->voltage_max_design_uv);
 697         fwnode_property_read_u32(fwnode, "trickle-charge-current-microamp",
 698                              &info->tricklecharge_current_ua);
 699         fwnode_property_read_u32(fwnode, "precharge-current-microamp",
 700                              &info->precharge_current_ua);
 701         fwnode_property_read_u32(fwnode, "precharge-upper-limit-microvolt",
 702                              &info->precharge_voltage_max_uv);
 703         fwnode_property_read_u32(fwnode, "charge-term-current-microamp",
 704                              &info->charge_term_current_ua);
 705         fwnode_property_read_u32(fwnode, "re-charge-voltage-microvolt",
 706                              &info->charge_restart_voltage_uv);
 707         fwnode_property_read_u32(fwnode, "over-voltage-threshold-microvolt",
 708                              &info->overvoltage_limit_uv);
 709         fwnode_property_read_u32(fwnode, "constant-charge-current-max-microamp",
 710                              &info->constant_charge_current_max_ua);
 711         fwnode_property_read_u32(fwnode, "constant-charge-voltage-max-microvolt",
 712                              &info->constant_charge_voltage_max_uv);
 713         fwnode_property_read_u32(fwnode, "factory-internal-resistance-micro-ohms",
 714                              &info->factory_internal_resistance_uohm);
 715
 716         if (!fwnode_property_read_u32_array(fwnode, "ambient-celsius",
 717                                             min_max, ARRAY_SIZE(min_max))) {
 718                 info->temp_ambient_alert_min = min_max[0];
 719                 info->temp_ambient_alert_max = min_max[1];
 720         }
 721         if (!fwnode_property_read_u32_array(fwnode, "alert-celsius",
 722                                             min_max, ARRAY_SIZE(min_max))) {
 723                 info->temp_alert_min = min_max[0];
 724                 info->temp_alert_max = min_max[1];
 725         }
 726         if (!fwnode_property_read_u32_array(fwnode, "operating-range-celsius",
 727                                             min_max, ARRAY_SIZE(min_max))) {
 728                 info->temp_min = min_max[0];
 729                 info->temp_max = min_max[1];
 730         }
 731
 732         /*
 733          * The below code uses raw of-data parsing to parse
 734          * /schemas/types.yaml#/definitions/uint32-matrix
 735          * data, so for now this is only support with of.
 736          */
 737         if (!battery_np)
 738                 goto out_ret_pointer;
 739
 740         len = of_property_count_u32_elems(battery_np, "ocv-capacity-celsius");
 741         if (len < 0 && len != -EINVAL) {
 742                 err = len;
 743                 goto out_put_node;
 744         } else if (len > POWER_SUPPLY_OCV_TEMP_MAX) {
 745                 dev_err(&psy->dev, "Too many temperature values\n");
 746                 err = -EINVAL;
 747                 goto out_put_node;
 748         } else if (len > 0) {
 749                 of_property_read_u32_array(battery_np, "ocv-capacity-celsius",
 750                                            info->ocv_temp, len);
 751         }
 752
 753         for (index = 0; index < len; index++) {
 754                 struct power_supply_battery_ocv_table *table;
 755                 char *propname;
 756                 int i, tab_len, size;
 757
 758                 propname = kasprintf(GFP_KERNEL, "ocv-capacity-table-%d", index);
 759                 if (!propname) {
 760                         power_supply_put_battery_info(psy, info);
 761                         err = -ENOMEM;
 762                         goto out_put_node;
 763                 }
 764                 list = of_get_property(battery_np, propname, &size);
 765                 if (!list || !size) {
 766                         dev_err(&psy->dev, "failed to get %s\n", propname);
 767                         kfree(propname);
 768                         power_supply_put_battery_info(psy, info);
 769                         err = -EINVAL;
 770                         goto out_put_node;
 771                 }
 772
 773                 kfree(propname);
 774                 tab_len = size / (2 * sizeof(__be32));
 775                 info->ocv_table_size[index] = tab_len;
 776
 777                 table = info->ocv_table[index] =
 778                         devm_kcalloc(&psy->dev, tab_len, sizeof(*table), GFP_KERNEL);
 779                 if (!info->ocv_table[index]) {
 780                         power_supply_put_battery_info(psy, info);
 781                         err = -ENOMEM;
 782                         goto out_put_node;
 783                 }
 784
 785                 for (i = 0; i < tab_len; i++) {
 786                         table[i].ocv = be32_to_cpu(*list);
 787                         list++;
 788                         table[i].capacity = be32_to_cpu(*list);
 789                         list++;
 790                 }
 791         }
 792
 793         list = of_get_property(battery_np, "resistance-temp-table", &len);
 794         if (!list || !len)
 795                 goto out_ret_pointer;
 796
 797         info->resist_table_size = len / (2 * sizeof(__be32));
 798         resist_table = info->resist_table = devm_kcalloc(&psy->dev,
 799                                                          info->resist_table_size,
 800                                                          sizeof(*resist_table),
 801                                                          GFP_KERNEL);
 802         if (!info->resist_table) {
 803                 power_supply_put_battery_info(psy, info);
 804                 err = -ENOMEM;
 805                 goto out_put_node;
 806         }
 807
 808         for (index = 0; index < info->resist_table_size; index++) {
 809                 resist_table[index].temp = be32_to_cpu(*list++);
 810                 resist_table[index].resistance = be32_to_cpu(*list++);
 811         }
 812
 813 out_ret_pointer:
 814         /* Finally return the whole thing */
 815         *info_out = info;
 816
 817 out_put_node:
 818         fwnode_handle_put(fwnode);
 819         of_node_put(battery_np);
 820         return err;
 821 }
 822 EXPORT_SYMBOL_GPL(power_supply_get_battery_info);
 823
 824 void power_supply_put_battery_info(struct power_supply *psy,
 825                                    struct power_supply_battery_info *info)
 826 {
 827         int i;
 828
 829         for (i = 0; i < POWER_SUPPLY_OCV_TEMP_MAX; i++) {
 830                 if (info->ocv_table[i])
 831                         devm_kfree(&psy->dev, info->ocv_table[i]);
 832         }
 833
 834         if (info->resist_table)
 835                 devm_kfree(&psy->dev, info->resist_table);
 836
 837         devm_kfree(&psy->dev, info);
 838 }
 839 EXPORT_SYMBOL_GPL(power_supply_put_battery_info);
 840
 841 const enum power_supply_property power_supply_battery_info_properties[] = {
 842         POWER_SUPPLY_PROP_TECHNOLOGY,
 843         POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
 844         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 845         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 846         POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
 847         POWER_SUPPLY_PROP_PRECHARGE_CURRENT,
 848         POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT,
 849         POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
 850         POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
 851         POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MIN,
 852         POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MAX,
 853         POWER_SUPPLY_PROP_TEMP_ALERT_MIN,
 854         POWER_SUPPLY_PROP_TEMP_ALERT_MAX,
 855         POWER_SUPPLY_PROP_TEMP_MIN,
 856         POWER_SUPPLY_PROP_TEMP_MAX,
 857 };
 858 EXPORT_SYMBOL_GPL(power_supply_battery_info_properties);
 859
 860 const size_t power_supply_battery_info_properties_size = ARRAY_SIZE(power_supply_battery_info_properties);
 861 EXPORT_SYMBOL_GPL(power_supply_battery_info_properties_size);
 862
 863 bool power_supply_battery_info_has_prop(struct power_supply_battery_info *info,
 864                                         enum power_supply_property psp)
 865 {
 866         if (!info)
 867                 return false;
 868
 869         switch (psp) {
 870                 case POWER_SUPPLY_PROP_TECHNOLOGY:
 871                         return info->technology != POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
 872                 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
 873                         return info->energy_full_design_uwh >= 0;
 874                 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 875                         return info->charge_full_design_uah >= 0;
 876                 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 877                         return info->voltage_min_design_uv >= 0;
 878                 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
 879                         return info->voltage_max_design_uv >= 0;
 880                 case POWER_SUPPLY_PROP_PRECHARGE_CURRENT:
 881                         return info->precharge_current_ua >= 0;
 882                 case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
 883                         return info->charge_term_current_ua >= 0;
 884                 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
 885                         return info->constant_charge_current_max_ua >= 0;
 886                 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
 887                         return info->constant_charge_voltage_max_uv >= 0;
 888                 case POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MIN:
 889                         return info->temp_ambient_alert_min > INT_MIN;
 890                 case POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MAX:
 891                         return info->temp_ambient_alert_max < INT_MAX;
 892                 case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
 893                         return info->temp_alert_min > INT_MIN;
 894                 case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
 895                         return info->temp_alert_max < INT_MAX;
 896                 case POWER_SUPPLY_PROP_TEMP_MIN:
 897                         return info->temp_min > INT_MIN;
 898                 case POWER_SUPPLY_PROP_TEMP_MAX:
 899                         return info->temp_max < INT_MAX;
 900                 default:
 901                         return false;
 902         }
 903 }
 904 EXPORT_SYMBOL_GPL(power_supply_battery_info_has_prop);
 905
 906 int power_supply_battery_info_get_prop(struct power_supply_battery_info *info,
 907                                        enum power_supply_property psp,
 908                                        union power_supply_propval *val)
 909 {
 910         if (!info)
 911                 return -EINVAL;
 912
 913         if (!power_supply_battery_info_has_prop(info, psp))
 914                 return -EINVAL;
 915
 916         switch (psp) {
 917                 case POWER_SUPPLY_PROP_TECHNOLOGY:
 918                         val->intval = info->technology;
 919                         return 0;
 920                 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
 921                         val->intval = info->energy_full_design_uwh;
 922                         return 0;
 923                 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 924                         val->intval = info->charge_full_design_uah;
 925                         return 0;
 926                 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 927                         val->intval = info->voltage_min_design_uv;
 928                         return 0;
 929                 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
 930                         val->intval = info->voltage_max_design_uv;
 931                         return 0;
 932                 case POWER_SUPPLY_PROP_PRECHARGE_CURRENT:
 933                         val->intval = info->precharge_current_ua;
 934                         return 0;
 935                 case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
 936                         val->intval = info->charge_term_current_ua;
 937                         return 0;
 938                 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
 939                         val->intval = info->constant_charge_current_max_ua;
 940                         return 0;
 941                 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
 942                         val->intval = info->constant_charge_voltage_max_uv;
 943                         return 0;
 944                 case POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MIN:
 945                         val->intval = info->temp_ambient_alert_min;
 946                         return 0;
 947                 case POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MAX:
 948                         val->intval = info->temp_ambient_alert_max;
 949                         return 0;
 950                 case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
 951                         val->intval = info->temp_alert_min;
 952                         return 0;
 953                 case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
 954                         val->intval = info->temp_alert_max;
 955                         return 0;
 956                 case POWER_SUPPLY_PROP_TEMP_MIN:
 957                         val->intval = info->temp_min;
 958                         return 0;
 959                 case POWER_SUPPLY_PROP_TEMP_MAX:
 960                         val->intval = info->temp_max;
 961                         return 0;
 962                 default:
 963                         return -EINVAL;
 964         }
 965 }
 966 EXPORT_SYMBOL_GPL(power_supply_battery_info_get_prop);
 967
 968 /**
 969  * power_supply_temp2resist_simple() - find the battery internal resistance
 970  * percent from temperature
 971  * @table: Pointer to battery resistance temperature table
 972  * @table_len: The table length
 973  * @temp: Current temperature
 974  *
 975  * This helper function is used to look up battery internal resistance percent
 976  * according to current temperature value from the resistance temperature table,
 977  * and the table must be ordered descending. Then the actual battery internal
 978  * resistance = the ideal battery internal resistance * percent / 100.
 979  *
 980  * Return: the battery internal resistance percent
 981  */
 982 int power_supply_temp2resist_simple(struct power_supply_resistance_temp_table *table,
 983                                     int table_len, int temp)
 984 {
 985         int i, high, low;
 986
 987         for (i = 0; i < table_len; i++)
 988                 if (temp > table[i].temp)
 989                         break;
 990
 991         /* The library function will deal with high == low */
 992         if (i == 0)
 993                 high = low = i;
 994         else if (i == table_len)
 995                 high = low = i - 1;
 996         else
 997                 high = (low = i) - 1;
 998
 999         return fixp_linear_interpolate(table[low].temp,
1000                                        table[low].resistance,
1001                                        table[high].temp,
1002                                        table[high].resistance,
1003                                        temp);
1004 }
1005 EXPORT_SYMBOL_GPL(power_supply_temp2resist_simple);
1006
1007 /**
1008  * power_supply_vbat2ri() - find the battery internal resistance
1009  * from the battery voltage
1010  * @info: The battery information container
1011  * @vbat_uv: The battery voltage in microvolt
1012  * @charging: If we are charging (true) or not (false)
1013  *
1014  * This helper function is used to look up battery internal resistance
1015  * according to current battery voltage. Depending on whether the battery
1016  * is currently charging or not, different resistance will be returned.
1017  *
1018  * Returns the internal resistance in microohm or negative error code.
1019  */
1020 int power_supply_vbat2ri(struct power_supply_battery_info *info,
1021                          int vbat_uv, bool charging)
1022 {
1023         struct power_supply_vbat_ri_table *vbat2ri;
1024         int table_len;
1025         int i, high, low;
1026
1027         /*
1028          * If we are charging, and the battery supplies a separate table
1029          * for this state, we use that in order to compensate for the
1030          * charging voltage. Otherwise we use the main table.
1031          */
1032         if (charging && info->vbat2ri_charging) {
1033                 vbat2ri = info->vbat2ri_charging;
1034                 table_len = info->vbat2ri_charging_size;
1035         } else {
1036                 vbat2ri = info->vbat2ri_discharging;
1037                 table_len = info->vbat2ri_discharging_size;
1038         }
1039
1040         /*
1041          * If no tables are specified, or if we are above the highest voltage in
1042          * the voltage table, just return the factory specified internal resistance.
1043          */
1044         if (!vbat2ri || (table_len <= 0) || (vbat_uv > vbat2ri[0].vbat_uv)) {
1045                 if (charging && (info->factory_internal_resistance_charging_uohm > 0))
1046                         return info->factory_internal_resistance_charging_uohm;
1047                 else
1048                         return info->factory_internal_resistance_uohm;
1049         }
1050
1051         /* Break loop at table_len - 1 because that is the highest index */
1052         for (i = 0; i < table_len - 1; i++)
1053                 if (vbat_uv > vbat2ri[i].vbat_uv)
1054                         break;
1055
1056         /* The library function will deal with high == low */
1057         if ((i == 0) || (i == (table_len - 1)))
1058                 high = i;
1059         else
1060                 high = i - 1;
1061         low = i;
1062
1063         return fixp_linear_interpolate(vbat2ri[low].vbat_uv,
1064                                        vbat2ri[low].ri_uohm,
1065                                        vbat2ri[high].vbat_uv,
1066                                        vbat2ri[high].ri_uohm,
1067                                        vbat_uv);
1068 }
1069 EXPORT_SYMBOL_GPL(power_supply_vbat2ri);
1070
1071 struct power_supply_maintenance_charge_table *
1072 power_supply_get_maintenance_charging_setting(struct power_supply_battery_info *info,
1073                                               int index)
1074 {
1075         if (index >= info->maintenance_charge_size)
1076                 return NULL;
1077         return &info->maintenance_charge[index];
1078 }
1079 EXPORT_SYMBOL_GPL(power_supply_get_maintenance_charging_setting);
1080
1081 /**
1082  * power_supply_ocv2cap_simple() - find the battery capacity
1083  * @table: Pointer to battery OCV lookup table
1084  * @table_len: OCV table length
1085  * @ocv: Current OCV value
1086  *
1087  * This helper function is used to look up battery capacity according to
1088  * current OCV value from one OCV table, and the OCV table must be ordered
1089  * descending.
1090  *
1091  * Return: the battery capacity.
1092  */
1093 int power_supply_ocv2cap_simple(struct power_supply_battery_ocv_table *table,
1094                                 int table_len, int ocv)
1095 {
1096         int i, high, low;
1097
1098         for (i = 0; i < table_len; i++)
1099                 if (ocv > table[i].ocv)
1100                         break;
1101
1102         /* The library function will deal with high == low */
1103         if (i == 0)
1104                 high = low = i;
1105         else if (i == table_len)
1106                 high = low = i - 1;
1107         else
1108                 high = (low = i) - 1;
1109
1110         return fixp_linear_interpolate(table[low].ocv,
1111                                        table[low].capacity,
1112                                        table[high].ocv,
1113                                        table[high].capacity,
1114                                        ocv);
1115 }
1116 EXPORT_SYMBOL_GPL(power_supply_ocv2cap_simple);
1117
1118 struct power_supply_battery_ocv_table *
1119 power_supply_find_ocv2cap_table(struct power_supply_battery_info *info,
1120                                 int temp, int *table_len)
1121 {
1122         int best_temp_diff = INT_MAX, temp_diff;
1123         u8 i, best_index = 0;
1124
1125         if (!info->ocv_table[0])
1126                 return NULL;
1127
1128         for (i = 0; i < POWER_SUPPLY_OCV_TEMP_MAX; i++) {
1129                 /* Out of capacity tables */
1130                 if (!info->ocv_table[i])
1131                         break;
1132
1133                 temp_diff = abs(info->ocv_temp[i] - temp);
1134
1135                 if (temp_diff < best_temp_diff) {
1136                         best_temp_diff = temp_diff;
1137                         best_index = i;
1138                 }
1139         }
1140
1141         *table_len = info->ocv_table_size[best_index];
1142         return info->ocv_table[best_index];
1143 }
1144 EXPORT_SYMBOL_GPL(power_supply_find_ocv2cap_table);
1145
1146 int power_supply_batinfo_ocv2cap(struct power_supply_battery_info *info,
1147                                  int ocv, int temp)
1148 {
1149         struct power_supply_battery_ocv_table *table;
1150         int table_len;
1151
1152         table = power_supply_find_ocv2cap_table(info, temp, &table_len);
1153         if (!table)
1154                 return -EINVAL;
1155
1156         return power_supply_ocv2cap_simple(table, table_len, ocv);
1157 }
1158 EXPORT_SYMBOL_GPL(power_supply_batinfo_ocv2cap);
1159
1160 bool power_supply_battery_bti_in_range(struct power_supply_battery_info *info,
1161                                        int resistance)
1162 {
1163         int low, high;
1164
1165         /* Nothing like this can be checked */
1166         if (info->bti_resistance_ohm <= 0)
1167                 return false;
1168
1169         /* This will be extremely strict and unlikely to work */
1170         if (info->bti_resistance_tolerance <= 0)
1171                 return (info->bti_resistance_ohm == resistance);
1172
1173         low = info->bti_resistance_ohm -
1174                 (info->bti_resistance_ohm * info->bti_resistance_tolerance) / 100;
1175         high = info->bti_resistance_ohm +
1176                 (info->bti_resistance_ohm * info->bti_resistance_tolerance) / 100;
1177
1178         return ((resistance >= low) && (resistance <= high));
1179 }
1180 EXPORT_SYMBOL_GPL(power_supply_battery_bti_in_range);
1181
1182 static bool psy_has_property(const struct power_supply_desc *psy_desc,
1183                              enum power_supply_property psp)
1184 {
1185         bool found = false;
1186         int i;
1187
1188         for (i = 0; i < psy_desc->num_properties; i++) {
1189                 if (psy_desc->properties[i] == psp) {
1190                         found = true;
1191                         break;
1192                 }
1193         }
1194
1195         return found;
1196 }
1197
1198 int power_supply_get_property(struct power_supply *psy,
1199                             enum power_supply_property psp,
1200                             union power_supply_propval *val)
1201 {
1202         if (atomic_read(&psy->use_cnt) <= 0) {
1203                 if (!psy->initialized)
1204                         return -EAGAIN;
1205                 return -ENODEV;
1206         }
1207
1208         if (psy_has_property(psy->desc, psp))
1209                 return psy->desc->get_property(psy, psp, val);
1210         else if (power_supply_battery_info_has_prop(psy->battery_info, psp))
1211                 return power_supply_battery_info_get_prop(psy->battery_info, psp, val);
1212         else
1213                 return -EINVAL;
1214 }
1215 EXPORT_SYMBOL_GPL(power_supply_get_property);
1216
1217 int power_supply_set_property(struct power_supply *psy,
1218                             enum power_supply_property psp,
1219                             const union power_supply_propval *val)
1220 {
1221         if (atomic_read(&psy->use_cnt) <= 0 || !psy->desc->set_property)
1222                 return -ENODEV;
1223
1224         return psy->desc->set_property(psy, psp, val);
1225 }
1226 EXPORT_SYMBOL_GPL(power_supply_set_property);
1227
1228 int power_supply_property_is_writeable(struct power_supply *psy,
1229                                         enum power_supply_property psp)
1230 {
1231         if (atomic_read(&psy->use_cnt) <= 0 ||
1232                         !psy->desc->property_is_writeable)
1233                 return -ENODEV;
1234
1235         return psy->desc->property_is_writeable(psy, psp);
1236 }
1237 EXPORT_SYMBOL_GPL(power_supply_property_is_writeable);
1238
1239 void power_supply_external_power_changed(struct power_supply *psy)
1240 {
1241         if (atomic_read(&psy->use_cnt) <= 0 ||
1242                         !psy->desc->external_power_changed)
1243                 return;
1244
1245         psy->desc->external_power_changed(psy);
1246 }
1247 EXPORT_SYMBOL_GPL(power_supply_external_power_changed);
1248
1249 int power_supply_powers(struct power_supply *psy, struct device *dev)
1250 {
1251         return sysfs_create_link(&psy->dev.kobj, &dev->kobj, "powers");
1252 }
1253 EXPORT_SYMBOL_GPL(power_supply_powers);
1254
1255 static void power_supply_dev_release(struct device *dev)
1256 {
1257         struct power_supply *psy = to_power_supply(dev);
1258         dev_dbg(dev, "%s\n", __func__);
1259         kfree(psy);
1260 }
1261
1262 int power_supply_reg_notifier(struct notifier_block *nb)
1263 {
1264         return blocking_notifier_chain_register(&power_supply_notifier, nb);
1265 }
1266 EXPORT_SYMBOL_GPL(power_supply_reg_notifier);
1267
1268 void power_supply_unreg_notifier(struct notifier_block *nb)
1269 {
1270         blocking_notifier_chain_unregister(&power_supply_notifier, nb);
1271 }
1272 EXPORT_SYMBOL_GPL(power_supply_unreg_notifier);
1273
1274 #ifdef CONFIG_THERMAL
1275 static int power_supply_read_temp(struct thermal_zone_device *tzd,
1276                 int *temp)
1277 {
1278         struct power_supply *psy;
1279         union power_supply_propval val;
1280         int ret;
1281
1282         WARN_ON(tzd == NULL);
1283         psy = thermal_zone_device_priv(tzd);
1284         ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_TEMP, &val);
1285         if (ret)
1286                 return ret;
1287
1288         /* Convert tenths of degree Celsius to milli degree Celsius. */
1289         *temp = val.intval * 100;
1290
1291         return ret;
1292 }
1293
1294 static struct thermal_zone_device_ops psy_tzd_ops = {
1295         .get_temp = power_supply_read_temp,
1296 };
1297
1298 static int psy_register_thermal(struct power_supply *psy)
1299 {
1300         int ret;
1301
1302         if (psy->desc->no_thermal)
1303                 return 0;
1304
1305         /* Register battery zone device psy reports temperature */
1306         if (psy_has_property(psy->desc, POWER_SUPPLY_PROP_TEMP)) {
1307                 /* Prefer our hwmon device and avoid duplicates */
1308                 struct thermal_zone_params tzp = {
1309                         .no_hwmon = IS_ENABLED(CONFIG_POWER_SUPPLY_HWMON)
1310                 };
1311                 psy->tzd = thermal_tripless_zone_device_register(psy->desc->name,
1312                                 psy, &psy_tzd_ops, &tzp);
1313                 if (IS_ERR(psy->tzd))
1314                         return PTR_ERR(psy->tzd);
1315                 ret = thermal_zone_device_enable(psy->tzd);
1316                 if (ret)
1317                         thermal_zone_device_unregister(psy->tzd);
1318                 return ret;
1319         }
1320
1321         return 0;
1322 }
1323
1324 static void psy_unregister_thermal(struct power_supply *psy)
1325 {
1326         if (IS_ERR_OR_NULL(psy->tzd))
1327                 return;
1328         thermal_zone_device_unregister(psy->tzd);
1329 }
1330
1331 #else
1332 static int psy_register_thermal(struct power_supply *psy)
1333 {
1334         return 0;
1335 }
1336
1337 static void psy_unregister_thermal(struct power_supply *psy)
1338 {
1339 }
1340 #endif
1341
1342 static struct power_supply *__must_check
1343 __power_supply_register(struct device *parent,
1344                                    const struct power_supply_desc *desc,
1345                                    const struct power_supply_config *cfg,
1346                                    bool ws)
1347 {
1348         struct device *dev;
1349         struct power_supply *psy;
1350         int rc;
1351
1352         if (!desc || !desc->name || !desc->properties || !desc->num_properties)
1353                 return ERR_PTR(-EINVAL);
1354
1355         if (!parent)
1356                 pr_warn("%s: Expected proper parent device for '%s'\n",
1357                         __func__, desc->name);
1358
1359         if (psy_has_property(desc, POWER_SUPPLY_PROP_USB_TYPE) &&
1360             (!desc->usb_types || !desc->num_usb_types))
1361                 return ERR_PTR(-EINVAL);
1362
1363         psy = kzalloc(sizeof(*psy), GFP_KERNEL);
1364         if (!psy)
1365                 return ERR_PTR(-ENOMEM);
1366
1367         dev = &psy->dev;
1368
1369         device_initialize(dev);
1370
1371         dev->class = power_supply_class;
1372         dev->type = &power_supply_dev_type;
1373         dev->parent = parent;
1374         dev->release = power_supply_dev_release;
1375         dev_set_drvdata(dev, psy);
1376         psy->desc = desc;
1377         if (cfg) {
1378                 dev->groups = cfg->attr_grp;
1379                 psy->drv_data = cfg->drv_data;
1380                 psy->of_node =
1381                         cfg->fwnode ? to_of_node(cfg->fwnode) : cfg->of_node;
1382                 dev->of_node = psy->of_node;
1383                 psy->supplied_to = cfg->supplied_to;
1384                 psy->num_supplicants = cfg->num_supplicants;
1385         }
1386
1387         rc = dev_set_name(dev, "%s", desc->name);
1388         if (rc)
1389                 goto dev_set_name_failed;
1390
1391         INIT_WORK(&psy->changed_work, power_supply_changed_work);
1392         INIT_DELAYED_WORK(&psy->deferred_register_work,
1393                           power_supply_deferred_register_work);
1394
1395         rc = power_supply_check_supplies(psy);
1396         if (rc) {
1397                 dev_dbg(dev, "Not all required supplies found, defer probe\n");
1398                 goto check_supplies_failed;
1399         }
1400
1401         /*
1402          * Expose constant battery info, if it is available. While there are
1403          * some chargers accessing constant battery data, we only want to
1404          * expose battery data to userspace for battery devices.
1405          */
1406         if (desc->type == POWER_SUPPLY_TYPE_BATTERY) {
1407                 rc = power_supply_get_battery_info(psy, &psy->battery_info);
1408                 if (rc && rc != -ENODEV && rc != -ENOENT)
1409                         goto check_supplies_failed;
1410         }
1411
1412         spin_lock_init(&psy->changed_lock);
1413         rc = device_add(dev);
1414         if (rc)
1415                 goto device_add_failed;
1416
1417         rc = device_init_wakeup(dev, ws);
1418         if (rc)
1419                 goto wakeup_init_failed;
1420
1421         rc = psy_register_thermal(psy);
1422         if (rc)
1423                 goto register_thermal_failed;
1424
1425         rc = power_supply_create_triggers(psy);
1426         if (rc)
1427                 goto create_triggers_failed;
1428
1429         rc = power_supply_add_hwmon_sysfs(psy);
1430         if (rc)
1431                 goto add_hwmon_sysfs_failed;
1432
1433         /*
1434          * Update use_cnt after any uevents (most notably from device_add()).
1435          * We are here still during driver's probe but
1436          * the power_supply_uevent() calls back driver's get_property
1437          * method so:
1438          * 1. Driver did not assigned the returned struct power_supply,
1439          * 2. Driver could not finish initialization (anything in its probe
1440          *    after calling power_supply_register()).
1441          */
1442         atomic_inc(&psy->use_cnt);
1443         psy->initialized = true;
1444
1445         queue_delayed_work(system_power_efficient_wq,
1446                            &psy->deferred_register_work,
1447                            POWER_SUPPLY_DEFERRED_REGISTER_TIME);
1448
1449         return psy;
1450
1451 add_hwmon_sysfs_failed:
1452         power_supply_remove_triggers(psy);
1453 create_triggers_failed:
1454         psy_unregister_thermal(psy);
1455 register_thermal_failed:
1456 wakeup_init_failed:
1457         device_del(dev);
1458 device_add_failed:
1459 check_supplies_failed:
1460 dev_set_name_failed:
1461         put_device(dev);
1462         return ERR_PTR(rc);
1463 }
1464
1465 /**
1466  * power_supply_register() - Register new power supply
1467  * @parent:     Device to be a parent of power supply's device, usually
1468  *              the device which probe function calls this
1469  * @desc:       Description of power supply, must be valid through whole
1470  *              lifetime of this power supply
1471  * @cfg:        Run-time specific configuration accessed during registering,
1472  *              may be NULL
1473  *
1474  * Return: A pointer to newly allocated power_supply on success
1475  * or ERR_PTR otherwise.
1476  * Use power_supply_unregister() on returned power_supply pointer to release
1477  * resources.
1478  */
1479 struct power_supply *__must_check power_supply_register(struct device *parent,
1480                 const struct power_supply_desc *desc,
1481                 const struct power_supply_config *cfg)
1482 {
1483         return __power_supply_register(parent, desc, cfg, true);
1484 }
1485 EXPORT_SYMBOL_GPL(power_supply_register);
1486
1487 /**
1488  * power_supply_register_no_ws() - Register new non-waking-source power supply
1489  * @parent:     Device to be a parent of power supply's device, usually
1490  *              the device which probe function calls this
1491  * @desc:       Description of power supply, must be valid through whole
1492  *              lifetime of this power supply
1493  * @cfg:        Run-time specific configuration accessed during registering,
1494  *              may be NULL
1495  *
1496  * Return: A pointer to newly allocated power_supply on success
1497  * or ERR_PTR otherwise.
1498  * Use power_supply_unregister() on returned power_supply pointer to release
1499  * resources.
1500  */
1501 struct power_supply *__must_check
1502 power_supply_register_no_ws(struct device *parent,
1503                 const struct power_supply_desc *desc,
1504                 const struct power_supply_config *cfg)
1505 {
1506         return __power_supply_register(parent, desc, cfg, false);
1507 }
1508 EXPORT_SYMBOL_GPL(power_supply_register_no_ws);
1509
1510 static void devm_power_supply_release(struct device *dev, void *res)
1511 {
1512         struct power_supply **psy = res;
1513
1514         power_supply_unregister(*psy);
1515 }
1516
1517 /**
1518  * devm_power_supply_register() - Register managed power supply
1519  * @parent:     Device to be a parent of power supply's device, usually
1520  *              the device which probe function calls this
1521  * @desc:       Description of power supply, must be valid through whole
1522  *              lifetime of this power supply
1523  * @cfg:        Run-time specific configuration accessed during registering,
1524  *              may be NULL
1525  *
1526  * Return: A pointer to newly allocated power_supply on success
1527  * or ERR_PTR otherwise.
1528  * The returned power_supply pointer will be automatically unregistered
1529  * on driver detach.
1530  */
1531 struct power_supply *__must_check
1532 devm_power_supply_register(struct device *parent,
1533                 const struct power_supply_desc *desc,
1534                 const struct power_supply_config *cfg)
1535 {
1536         struct power_supply **ptr, *psy;
1537
1538         ptr = devres_alloc(devm_power_supply_release, sizeof(*ptr), GFP_KERNEL);
1539
1540         if (!ptr)
1541                 return ERR_PTR(-ENOMEM);
1542         psy = __power_supply_register(parent, desc, cfg, true);
1543         if (IS_ERR(psy)) {
1544                 devres_free(ptr);
1545         } else {
1546                 *ptr = psy;
1547                 devres_add(parent, ptr);
1548         }
1549         return psy;
1550 }
1551 EXPORT_SYMBOL_GPL(devm_power_supply_register);
1552
1553 /**
1554  * devm_power_supply_register_no_ws() - Register managed non-waking-source power supply
1555  * @parent:     Device to be a parent of power supply's device, usually
1556  *              the device which probe function calls this
1557  * @desc:       Description of power supply, must be valid through whole
1558  *              lifetime of this power supply
1559  * @cfg:        Run-time specific configuration accessed during registering,
1560  *              may be NULL
1561  *
1562  * Return: A pointer to newly allocated power_supply on success
1563  * or ERR_PTR otherwise.
1564  * The returned power_supply pointer will be automatically unregistered
1565  * on driver detach.
1566  */
1567 struct power_supply *__must_check
1568 devm_power_supply_register_no_ws(struct device *parent,
1569                 const struct power_supply_desc *desc,
1570                 const struct power_supply_config *cfg)
1571 {
1572         struct power_supply **ptr, *psy;
1573
1574         ptr = devres_alloc(devm_power_supply_release, sizeof(*ptr), GFP_KERNEL);
1575
1576         if (!ptr)
1577                 return ERR_PTR(-ENOMEM);
1578         psy = __power_supply_register(parent, desc, cfg, false);
1579         if (IS_ERR(psy)) {
1580                 devres_free(ptr);
1581         } else {
1582                 *ptr = psy;
1583                 devres_add(parent, ptr);
1584         }
1585         return psy;
1586 }
1587 EXPORT_SYMBOL_GPL(devm_power_supply_register_no_ws);
1588
1589 /**
1590  * power_supply_unregister() - Remove this power supply from system
1591  * @psy:        Pointer to power supply to unregister
1592  *
1593  * Remove this power supply from the system. The resources of power supply
1594  * will be freed here or on last power_supply_put() call.
1595  */
1596 void power_supply_unregister(struct power_supply *psy)
1597 {
1598         WARN_ON(atomic_dec_return(&psy->use_cnt));
1599         psy->removing = true;
1600         cancel_work_sync(&psy->changed_work);
1601         cancel_delayed_work_sync(&psy->deferred_register_work);
1602         sysfs_remove_link(&psy->dev.kobj, "powers");
1603         power_supply_remove_hwmon_sysfs(psy);
1604         power_supply_remove_triggers(psy);
1605         psy_unregister_thermal(psy);
1606         device_init_wakeup(&psy->dev, false);
1607         device_unregister(&psy->dev);
1608 }
1609 EXPORT_SYMBOL_GPL(power_supply_unregister);
1610
1611 void *power_supply_get_drvdata(struct power_supply *psy)
1612 {
1613         return psy->drv_data;
1614 }
1615 EXPORT_SYMBOL_GPL(power_supply_get_drvdata);
1616
1617 static int __init power_supply_class_init(void)
1618 {
1619         power_supply_class = class_create("power_supply");
1620
1621         if (IS_ERR(power_supply_class))
1622                 return PTR_ERR(power_supply_class);
1623
1624         power_supply_class->dev_uevent = power_supply_uevent;
1625         power_supply_init_attrs(&power_supply_dev_type);
1626
1627         return 0;
1628 }
1629
1630 static void __exit power_supply_class_exit(void)
1631 {
1632         class_destroy(power_supply_class);
1633 }
1634
1635 subsys_initcall(power_supply_class_init);
1636 module_exit(power_supply_class_exit);
1637
1638 MODULE_DESCRIPTION("Universal power supply monitor class");
1639 MODULE_AUTHOR("Ian Molton <spyro@f2s.com>, "
1640               "Szabolcs Gyurko, "
1641               "Anton Vorontsov <cbou@mail.ru>");