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 <[email protected]>
   6  *  Copyright © 2004  Szabolcs Gyurko
   7  *  Copyright © 2003  Ian Molton <[email protected]>
   8  *
   9  *  Modified: 2004, Oct     Szabolcs Gyurko
  10  */
  11
  12 #include <linux/cleanup.h>
  13 #include <linux/module.h>
  14 #include <linux/types.h>
  15 #include <linux/init.h>
  16 #include <linux/slab.h>
  17 #include <linux/delay.h>
  18 #include <linux/device.h>
  19 #include <linux/notifier.h>
  20 #include <linux/err.h>
  21 #include <linux/of.h>
  22 #include <linux/power_supply.h>
  23 #include <linux/property.h>
  24 #include <linux/thermal.h>
  25 #include <linux/fixp-arith.h>
  26 #include "power_supply.h"
  27 #include "samsung-sdi-battery.h"
  28
  29 static const struct class power_supply_class = {
  30         .name = "power_supply",
  31         .dev_uevent = power_supply_uevent,
  32 };
  33
  34 static BLOCKING_NOTIFIER_HEAD(power_supply_notifier);
  35
  36 static const struct device_type power_supply_dev_type = {
  37         .name = "power_supply",
  38         .groups = power_supply_attr_groups,
  39 };
  40
  41 #define POWER_SUPPLY_DEFERRED_REGISTER_TIME     msecs_to_jiffies(10)
  42
  43 static bool __power_supply_is_supplied_by(struct power_supply *supplier,
  44                                          struct power_supply *supply)
  45 {
  46         int i;
  47
  48         if (!supply->supplied_from && !supplier->supplied_to)
  49                 return false;
  50
  51         /* Support both supplied_to and supplied_from modes */
  52         if (supply->supplied_from) {
  53                 if (!supplier->desc->name)
  54                         return false;
  55                 for (i = 0; i < supply->num_supplies; i++)
  56                         if (!strcmp(supplier->desc->name, supply->supplied_from[i]))
  57                                 return true;
  58         } else {
  59                 if (!supply->desc->name)
  60                         return false;
  61                 for (i = 0; i < supplier->num_supplicants; i++)
  62                         if (!strcmp(supplier->supplied_to[i], supply->desc->name))
  63                                 return true;
  64         }
  65
  66         return false;
  67 }
  68
  69 static int __power_supply_changed_work(struct device *dev, void *data)
  70 {
  71         struct power_supply *psy = data;
  72         struct power_supply *pst = dev_get_drvdata(dev);
  73
  74         if (__power_supply_is_supplied_by(psy, pst)) {
  75                 if (pst->desc->external_power_changed)
  76                         pst->desc->external_power_changed(pst);
  77         }
  78
  79         return 0;
  80 }
  81
  82 static void power_supply_changed_work(struct work_struct *work)
  83 {
  84         unsigned long flags;
  85         struct power_supply *psy = container_of(work, struct power_supply,
  86                                                 changed_work);
  87
  88         dev_dbg(&psy->dev, "%s\n", __func__);
  89
  90         spin_lock_irqsave(&psy->changed_lock, flags);
  91         /*
  92          * Check 'changed' here to avoid issues due to race between
  93          * power_supply_changed() and this routine. In worst case
  94          * power_supply_changed() can be called again just before we take above
  95          * lock. During the first call of this routine we will mark 'changed' as
  96          * false and it will stay false for the next call as well.
  97          */
  98         if (likely(psy->changed)) {
  99                 psy->changed = false;
 100                 spin_unlock_irqrestore(&psy->changed_lock, flags);
 101                 power_supply_for_each_device(psy, __power_supply_changed_work);
 102                 power_supply_update_leds(psy);
 103                 blocking_notifier_call_chain(&power_supply_notifier,
 104                                 PSY_EVENT_PROP_CHANGED, psy);
 105                 kobject_uevent(&psy->dev.kobj, KOBJ_CHANGE);
 106                 spin_lock_irqsave(&psy->changed_lock, flags);
 107         }
 108
 109         /*
 110          * Hold the wakeup_source until all events are processed.
 111          * power_supply_changed() might have called again and have set 'changed'
 112          * to true.
 113          */
 114         if (likely(!psy->changed))
 115                 pm_relax(&psy->dev);
 116         spin_unlock_irqrestore(&psy->changed_lock, flags);
 117 }
 118
 119 int power_supply_for_each_device(void *data, int (*fn)(struct device *dev, void *data))
 120 {
 121         return class_for_each_device(&power_supply_class, NULL, data, fn);
 122 }
 123 EXPORT_SYMBOL_GPL(power_supply_for_each_device);
 124
 125 void power_supply_changed(struct power_supply *psy)
 126 {
 127         unsigned long flags;
 128
 129         dev_dbg(&psy->dev, "%s\n", __func__);
 130
 131         spin_lock_irqsave(&psy->changed_lock, flags);
 132         psy->changed = true;
 133         pm_stay_awake(&psy->dev);
 134         spin_unlock_irqrestore(&psy->changed_lock, flags);
 135         schedule_work(&psy->changed_work);
 136 }
 137 EXPORT_SYMBOL_GPL(power_supply_changed);
 138
 139 /*
 140  * Notify that power supply was registered after parent finished the probing.
 141  *
 142  * Often power supply is registered from driver's probe function. However
 143  * calling power_supply_changed() directly from power_supply_register()
 144  * would lead to execution of get_property() function provided by the driver
 145  * too early - before the probe ends.
 146  *
 147  * Avoid that by waiting on parent's mutex.
 148  */
 149 static void power_supply_deferred_register_work(struct work_struct *work)
 150 {
 151         struct power_supply *psy = container_of(work, struct power_supply,
 152                                                 deferred_register_work.work);
 153
 154         if (psy->dev.parent) {
 155                 while (!device_trylock(psy->dev.parent)) {
 156                         if (psy->removing)
 157                                 return;
 158                         msleep(10);
 159                 }
 160         }
 161
 162         power_supply_changed(psy);
 163
 164         if (psy->dev.parent)
 165                 device_unlock(psy->dev.parent);
 166 }
 167
 168 #ifdef CONFIG_OF
 169 static int __power_supply_populate_supplied_from(struct device *dev,
 170                                                  void *data)
 171 {
 172         struct power_supply *psy = data;
 173         struct power_supply *epsy = dev_get_drvdata(dev);
 174         struct device_node *np;
 175         int i = 0;
 176
 177         do {
 178                 np = of_parse_phandle(psy->of_node, "power-supplies", i++);
 179                 if (!np)
 180                         break;
 181
 182                 if (np == epsy->of_node) {
 183                         dev_dbg(&psy->dev, "%s: Found supply : %s\n",
 184                                 psy->desc->name, epsy->desc->name);
 185                         psy->supplied_from[i-1] = (char *)epsy->desc->name;
 186                         psy->num_supplies++;
 187                         of_node_put(np);
 188                         break;
 189                 }
 190                 of_node_put(np);
 191         } while (np);
 192
 193         return 0;
 194 }
 195
 196 static int power_supply_populate_supplied_from(struct power_supply *psy)
 197 {
 198         int error;
 199
 200         error = power_supply_for_each_device(psy, __power_supply_populate_supplied_from);
 201
 202         dev_dbg(&psy->dev, "%s %d\n", __func__, error);
 203
 204         return error;
 205 }
 206
 207 static int  __power_supply_find_supply_from_node(struct device *dev,
 208                                                  void *data)
 209 {
 210         struct device_node *np = data;
 211         struct power_supply *epsy = dev_get_drvdata(dev);
 212
 213         /* returning non-zero breaks out of power_supply_for_each_device loop */
 214         if (epsy->of_node == np)
 215                 return 1;
 216
 217         return 0;
 218 }
 219
 220 static int power_supply_find_supply_from_node(struct device_node *supply_node)
 221 {
 222         int error;
 223
 224         /*
 225          * power_supply_for_each_device() either returns its own errors or values
 226          * returned by __power_supply_find_supply_from_node().
 227          *
 228          * __power_supply_find_supply_from_node() will return 0 (no match)
 229          * or 1 (match).
 230          *
 231          * We return 0 if power_supply_for_each_device() returned 1, -EPROBE_DEFER if
 232          * it returned 0, or error as returned by it.
 233          */
 234         error = power_supply_for_each_device(supply_node, __power_supply_find_supply_from_node);
 235
 236         return error ? (error == 1 ? 0 : error) : -EPROBE_DEFER;
 237 }
 238
 239 static int power_supply_check_supplies(struct power_supply *psy)
 240 {
 241         struct device_node *np;
 242         int cnt = 0;
 243
 244         /* If there is already a list honor it */
 245         if (psy->supplied_from && psy->num_supplies > 0)
 246                 return 0;
 247
 248         /* No device node found, nothing to do */
 249         if (!psy->of_node)
 250                 return 0;
 251
 252         do {
 253                 int ret;
 254
 255                 np = of_parse_phandle(psy->of_node, "power-supplies", cnt++);
 256                 if (!np)
 257                         break;
 258
 259                 ret = power_supply_find_supply_from_node(np);
 260                 of_node_put(np);
 261
 262                 if (ret) {
 263                         dev_dbg(&psy->dev, "Failed to find supply!\n");
 264                         return ret;
 265                 }
 266         } while (np);
 267
 268         /* Missing valid "power-supplies" entries */
 269         if (cnt == 1)
 270                 return 0;
 271
 272         /* All supplies found, allocate char ** array for filling */
 273         psy->supplied_from = devm_kzalloc(&psy->dev, sizeof(*psy->supplied_from),
 274                                           GFP_KERNEL);
 275         if (!psy->supplied_from)
 276                 return -ENOMEM;
 277
 278         *psy->supplied_from = devm_kcalloc(&psy->dev,
 279                                            cnt - 1, sizeof(**psy->supplied_from),
 280                                            GFP_KERNEL);
 281         if (!*psy->supplied_from)
 282                 return -ENOMEM;
 283
 284         return power_supply_populate_supplied_from(psy);
 285 }
 286 #else
 287 static int power_supply_check_supplies(struct power_supply *psy)
 288 {
 289         int nval, ret;
 290
 291         if (!psy->dev.parent)
 292                 return 0;
 293
 294         nval = device_property_string_array_count(psy->dev.parent, "supplied-from");
 295         if (nval <= 0)
 296                 return 0;
 297
 298         psy->supplied_from = devm_kmalloc_array(&psy->dev, nval,
 299                                                 sizeof(char *), GFP_KERNEL);
 300         if (!psy->supplied_from)
 301                 return -ENOMEM;
 302
 303         ret = device_property_read_string_array(psy->dev.parent,
 304                 "supplied-from", (const char **)psy->supplied_from, nval);
 305         if (ret < 0)
 306                 return ret;
 307
 308         psy->num_supplies = nval;
 309
 310         return 0;
 311 }
 312 #endif
 313
 314 struct psy_am_i_supplied_data {
 315         struct power_supply *psy;
 316         unsigned int count;
 317 };
 318
 319 static int __power_supply_am_i_supplied(struct device *dev, void *_data)
 320 {
 321         union power_supply_propval ret = {0,};
 322         struct power_supply *epsy = dev_get_drvdata(dev);
 323         struct psy_am_i_supplied_data *data = _data;
 324
 325         if (__power_supply_is_supplied_by(epsy, data->psy)) {
 326                 data->count++;
 327                 if (!epsy->desc->get_property(epsy, POWER_SUPPLY_PROP_ONLINE,
 328                                         &ret))
 329                         return ret.intval;
 330         }
 331
 332         return 0;
 333 }
 334
 335 int power_supply_am_i_supplied(struct power_supply *psy)
 336 {
 337         struct psy_am_i_supplied_data data = { psy, 0 };
 338         int error;
 339
 340         error = power_supply_for_each_device(&data, __power_supply_am_i_supplied);
 341
 342         dev_dbg(&psy->dev, "%s count %u err %d\n", __func__, data.count, error);
 343
 344         if (data.count == 0)
 345                 return -ENODEV;
 346
 347         return error;
 348 }
 349 EXPORT_SYMBOL_GPL(power_supply_am_i_supplied);
 350
 351 static int __power_supply_is_system_supplied(struct device *dev, void *data)
 352 {
 353         union power_supply_propval ret = {0,};
 354         struct power_supply *psy = dev_get_drvdata(dev);
 355         unsigned int *count = data;
 356
 357         if (!psy->desc->get_property(psy, POWER_SUPPLY_PROP_SCOPE, &ret))
 358                 if (ret.intval == POWER_SUPPLY_SCOPE_DEVICE)
 359                         return 0;
 360
 361         (*count)++;
 362         if (psy->desc->type != POWER_SUPPLY_TYPE_BATTERY)
 363                 if (!psy->desc->get_property(psy, POWER_SUPPLY_PROP_ONLINE,
 364                                         &ret))
 365                         return ret.intval;
 366
 367         return 0;
 368 }
 369
 370 int power_supply_is_system_supplied(void)
 371 {
 372         int error;
 373         unsigned int count = 0;
 374
 375         error = power_supply_for_each_device(&count, __power_supply_is_system_supplied);
 376
 377         /*
 378          * If no system scope power class device was found at all, most probably we
 379          * are running on a desktop system, so assume we are on mains power.
 380          */
 381         if (count == 0)
 382                 return 1;
 383
 384         return error;
 385 }
 386 EXPORT_SYMBOL_GPL(power_supply_is_system_supplied);
 387
 388 struct psy_get_supplier_prop_data {
 389         struct power_supply *psy;
 390         enum power_supply_property psp;
 391         union power_supply_propval *val;
 392 };
 393
 394 static int __power_supply_get_supplier_property(struct device *dev, void *_data)
 395 {
 396         struct power_supply *epsy = dev_get_drvdata(dev);
 397         struct psy_get_supplier_prop_data *data = _data;
 398
 399         if (__power_supply_is_supplied_by(epsy, data->psy))
 400                 if (!power_supply_get_property(epsy, data->psp, data->val))
 401                         return 1; /* Success */
 402
 403         return 0; /* Continue iterating */
 404 }
 405
 406 int power_supply_get_property_from_supplier(struct power_supply *psy,
 407                                             enum power_supply_property psp,
 408                                             union power_supply_propval *val)
 409 {
 410         struct psy_get_supplier_prop_data data = {
 411                 .psy = psy,
 412                 .psp = psp,
 413                 .val = val,
 414         };
 415         int ret;
 416
 417         /*
 418          * This function is not intended for use with a supply with multiple
 419          * suppliers, we simply pick the first supply to report the psp.
 420          */
 421         ret = power_supply_for_each_device(&data, __power_supply_get_supplier_property);
 422         if (ret < 0)
 423                 return ret;
 424         if (ret == 0)
 425                 return -ENODEV;
 426
 427         return 0;
 428 }
 429 EXPORT_SYMBOL_GPL(power_supply_get_property_from_supplier);
 430
 431 int power_supply_set_battery_charged(struct power_supply *psy)
 432 {
 433         if (atomic_read(&psy->use_cnt) >= 0 &&
 434                         psy->desc->type == POWER_SUPPLY_TYPE_BATTERY &&
 435                         psy->desc->set_charged) {
 436                 psy->desc->set_charged(psy);
 437                 return 0;
 438         }
 439
 440         return -EINVAL;
 441 }
 442 EXPORT_SYMBOL_GPL(power_supply_set_battery_charged);
 443
 444 static int power_supply_match_device_by_name(struct device *dev, const void *data)
 445 {
 446         const char *name = data;
 447         struct power_supply *psy = dev_get_drvdata(dev);
 448
 449         return strcmp(psy->desc->name, name) == 0;
 450 }
 451
 452 /**
 453  * power_supply_get_by_name() - Search for a power supply and returns its ref
 454  * @name: Power supply name to fetch
 455  *
 456  * If power supply was found, it increases reference count for the
 457  * internal power supply's device. The user should power_supply_put()
 458  * after usage.
 459  *
 460  * Return: On success returns a reference to a power supply with
 461  * matching name equals to @name, a NULL otherwise.
 462  */
 463 struct power_supply *power_supply_get_by_name(const char *name)
 464 {
 465         struct power_supply *psy = NULL;
 466         struct device *dev = class_find_device(&power_supply_class, NULL, name,
 467                                                power_supply_match_device_by_name);
 468
 469         if (dev) {
 470                 psy = dev_get_drvdata(dev);
 471                 atomic_inc(&psy->use_cnt);
 472         }
 473
 474         return psy;
 475 }
 476 EXPORT_SYMBOL_GPL(power_supply_get_by_name);
 477
 478 /**
 479  * power_supply_put() - Drop reference obtained with power_supply_get_by_name
 480  * @psy: Reference to put
 481  *
 482  * The reference to power supply should be put before unregistering
 483  * the power supply.
 484  */
 485 void power_supply_put(struct power_supply *psy)
 486 {
 487         atomic_dec(&psy->use_cnt);
 488         put_device(&psy->dev);
 489 }
 490 EXPORT_SYMBOL_GPL(power_supply_put);
 491
 492 #ifdef CONFIG_OF
 493 static int power_supply_match_device_node(struct device *dev, const void *data)
 494 {
 495         return dev->parent && dev->parent->of_node == data;
 496 }
 497
 498 /**
 499  * power_supply_get_by_phandle() - Search for a power supply and returns its ref
 500  * @np: Pointer to device node holding phandle property
 501  * @property: Name of property holding a power supply name
 502  *
 503  * If power supply was found, it increases reference count for the
 504  * internal power supply's device. The user should power_supply_put()
 505  * after usage.
 506  *
 507  * Return: On success returns a reference to a power supply with
 508  * matching name equals to value under @property, NULL or ERR_PTR otherwise.
 509  */
 510 struct power_supply *power_supply_get_by_phandle(struct device_node *np,
 511                                                         const char *property)
 512 {
 513         struct device_node *power_supply_np;
 514         struct power_supply *psy = NULL;
 515         struct device *dev;
 516
 517         power_supply_np = of_parse_phandle(np, property, 0);
 518         if (!power_supply_np)
 519                 return ERR_PTR(-ENODEV);
 520
 521         dev = class_find_device(&power_supply_class, NULL, power_supply_np,
 522                                 power_supply_match_device_node);
 523
 524         of_node_put(power_supply_np);
 525
 526         if (dev) {
 527                 psy = dev_get_drvdata(dev);
 528                 atomic_inc(&psy->use_cnt);
 529         }
 530
 531         return psy;
 532 }
 533 EXPORT_SYMBOL_GPL(power_supply_get_by_phandle);
 534
 535 static void devm_power_supply_put(struct device *dev, void *res)
 536 {
 537         struct power_supply **psy = res;
 538
 539         power_supply_put(*psy);
 540 }
 541
 542 /**
 543  * devm_power_supply_get_by_phandle() - Resource managed version of
 544  *  power_supply_get_by_phandle()
 545  * @dev: Pointer to device holding phandle property
 546  * @property: Name of property holding a power supply phandle
 547  *
 548  * Return: On success returns a reference to a power supply with
 549  * matching name equals to value under @property, NULL or ERR_PTR otherwise.
 550  */
 551 struct power_supply *devm_power_supply_get_by_phandle(struct device *dev,
 552                                                       const char *property)
 553 {
 554         struct power_supply **ptr, *psy;
 555
 556         if (!dev->of_node)
 557                 return ERR_PTR(-ENODEV);
 558
 559         ptr = devres_alloc(devm_power_supply_put, sizeof(*ptr), GFP_KERNEL);
 560         if (!ptr)
 561                 return ERR_PTR(-ENOMEM);
 562
 563         psy = power_supply_get_by_phandle(dev->of_node, property);
 564         if (IS_ERR_OR_NULL(psy)) {
 565                 devres_free(ptr);
 566         } else {
 567                 *ptr = psy;
 568                 devres_add(dev, ptr);
 569         }
 570         return psy;
 571 }
 572 EXPORT_SYMBOL_GPL(devm_power_supply_get_by_phandle);
 573 #endif /* CONFIG_OF */
 574
 575 int power_supply_get_battery_info(struct power_supply *psy,
 576                                   struct power_supply_battery_info **info_out)
 577 {
 578         struct power_supply_resistance_temp_table *resist_table;
 579         struct power_supply_battery_info *info;
 580         struct device_node *battery_np = NULL;
 581         struct fwnode_reference_args args;
 582         struct fwnode_handle *fwnode = NULL;
 583         const char *value;
 584         int err, len, index;
 585         const __be32 *list;
 586         u32 min_max[2];
 587
 588         if (psy->of_node) {
 589                 battery_np = of_parse_phandle(psy->of_node, "monitored-battery", 0);
 590                 if (!battery_np)
 591                         return -ENODEV;
 592
 593                 fwnode = fwnode_handle_get(of_fwnode_handle(battery_np));
 594         } else if (psy->dev.parent) {
 595                 err = fwnode_property_get_reference_args(
 596                                         dev_fwnode(psy->dev.parent),
 597                                         "monitored-battery", NULL, 0, 0, &args);
 598                 if (err)
 599                         return err;
 600
 601                 fwnode = args.fwnode;
 602         }
 603
 604         if (!fwnode)
 605                 return -ENOENT;
 606
 607         err = fwnode_property_read_string(fwnode, "compatible", &value);
 608         if (err)
 609                 goto out_put_node;
 610
 611
 612         /* Try static batteries first */
 613         err = samsung_sdi_battery_get_info(&psy->dev, value, &info);
 614         if (!err)
 615                 goto out_ret_pointer;
 616         else if (err == -ENODEV)
 617                 /*
 618                  * Device does not have a static battery.
 619                  * Proceed to look for a simple battery.
 620                  */
 621                 err = 0;
 622
 623         if (strcmp("simple-battery", value)) {
 624                 err = -ENODEV;
 625                 goto out_put_node;
 626         }
 627
 628         info = devm_kzalloc(&psy->dev, sizeof(*info), GFP_KERNEL);
 629         if (!info) {
 630                 err = -ENOMEM;
 631                 goto out_put_node;
 632         }
 633
 634         info->technology                     = POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
 635         info->energy_full_design_uwh         = -EINVAL;
 636         info->charge_full_design_uah         = -EINVAL;
 637         info->voltage_min_design_uv          = -EINVAL;
 638         info->voltage_max_design_uv          = -EINVAL;
 639         info->precharge_current_ua           = -EINVAL;
 640         info->charge_term_current_ua         = -EINVAL;
 641         info->constant_charge_current_max_ua = -EINVAL;
 642         info->constant_charge_voltage_max_uv = -EINVAL;
 643         info->tricklecharge_current_ua       = -EINVAL;
 644         info->precharge_voltage_max_uv       = -EINVAL;
 645         info->charge_restart_voltage_uv      = -EINVAL;
 646         info->overvoltage_limit_uv           = -EINVAL;
 647         info->maintenance_charge             = NULL;
 648         info->alert_low_temp_charge_current_ua = -EINVAL;
 649         info->alert_low_temp_charge_voltage_uv = -EINVAL;
 650         info->alert_high_temp_charge_current_ua = -EINVAL;
 651         info->alert_high_temp_charge_voltage_uv = -EINVAL;
 652         info->temp_ambient_alert_min         = INT_MIN;
 653         info->temp_ambient_alert_max         = INT_MAX;
 654         info->temp_alert_min                 = INT_MIN;
 655         info->temp_alert_max                 = INT_MAX;
 656         info->temp_min                       = INT_MIN;
 657         info->temp_max                       = INT_MAX;
 658         info->factory_internal_resistance_uohm  = -EINVAL;
 659         info->resist_table                   = NULL;
 660         info->bti_resistance_ohm             = -EINVAL;
 661         info->bti_resistance_tolerance       = -EINVAL;
 662
 663         for (index = 0; index < POWER_SUPPLY_OCV_TEMP_MAX; index++) {
 664                 info->ocv_table[index]       = NULL;
 665                 info->ocv_temp[index]        = -EINVAL;
 666                 info->ocv_table_size[index]  = -EINVAL;
 667         }
 668
 669         /* The property and field names below must correspond to elements
 670          * in enum power_supply_property. For reasoning, see
 671          * Documentation/power/power_supply_class.rst.
 672          */
 673
 674         if (!fwnode_property_read_string(fwnode, "device-chemistry", &value)) {
 675                 if (!strcmp("nickel-cadmium", value))
 676                         info->technology = POWER_SUPPLY_TECHNOLOGY_NiCd;
 677                 else if (!strcmp("nickel-metal-hydride", value))
 678                         info->technology = POWER_SUPPLY_TECHNOLOGY_NiMH;
 679                 else if (!strcmp("lithium-ion", value))
 680                         /* Imprecise lithium-ion type */
 681                         info->technology = POWER_SUPPLY_TECHNOLOGY_LION;
 682                 else if (!strcmp("lithium-ion-polymer", value))
 683                         info->technology = POWER_SUPPLY_TECHNOLOGY_LIPO;
 684                 else if (!strcmp("lithium-ion-iron-phosphate", value))
 685                         info->technology = POWER_SUPPLY_TECHNOLOGY_LiFe;
 686                 else if (!strcmp("lithium-ion-manganese-oxide", value))
 687                         info->technology = POWER_SUPPLY_TECHNOLOGY_LiMn;
 688                 else
 689                         dev_warn(&psy->dev, "%s unknown battery type\n", value);
 690         }
 691
 692         fwnode_property_read_u32(fwnode, "energy-full-design-microwatt-hours",
 693                              &info->energy_full_design_uwh);
 694         fwnode_property_read_u32(fwnode, "charge-full-design-microamp-hours",
 695                              &info->charge_full_design_uah);
 696         fwnode_property_read_u32(fwnode, "voltage-min-design-microvolt",
 697                              &info->voltage_min_design_uv);
 698         fwnode_property_read_u32(fwnode, "voltage-max-design-microvolt",
 699                              &info->voltage_max_design_uv);
 700         fwnode_property_read_u32(fwnode, "trickle-charge-current-microamp",
 701                              &info->tricklecharge_current_ua);
 702         fwnode_property_read_u32(fwnode, "precharge-current-microamp",
 703                              &info->precharge_current_ua);
 704         fwnode_property_read_u32(fwnode, "precharge-upper-limit-microvolt",
 705                              &info->precharge_voltage_max_uv);
 706         fwnode_property_read_u32(fwnode, "charge-term-current-microamp",
 707                              &info->charge_term_current_ua);
 708         fwnode_property_read_u32(fwnode, "re-charge-voltage-microvolt",
 709                              &info->charge_restart_voltage_uv);
 710         fwnode_property_read_u32(fwnode, "over-voltage-threshold-microvolt",
 711                              &info->overvoltage_limit_uv);
 712         fwnode_property_read_u32(fwnode, "constant-charge-current-max-microamp",
 713                              &info->constant_charge_current_max_ua);
 714         fwnode_property_read_u32(fwnode, "constant-charge-voltage-max-microvolt",
 715                              &info->constant_charge_voltage_max_uv);
 716         fwnode_property_read_u32(fwnode, "factory-internal-resistance-micro-ohms",
 717                              &info->factory_internal_resistance_uohm);
 718
 719         if (!fwnode_property_read_u32_array(fwnode, "ambient-celsius",
 720                                             min_max, ARRAY_SIZE(min_max))) {
 721                 info->temp_ambient_alert_min = min_max[0];
 722                 info->temp_ambient_alert_max = min_max[1];
 723         }
 724         if (!fwnode_property_read_u32_array(fwnode, "alert-celsius",
 725                                             min_max, ARRAY_SIZE(min_max))) {
 726                 info->temp_alert_min = min_max[0];
 727                 info->temp_alert_max = min_max[1];
 728         }
 729         if (!fwnode_property_read_u32_array(fwnode, "operating-range-celsius",
 730                                             min_max, ARRAY_SIZE(min_max))) {
 731                 info->temp_min = min_max[0];
 732                 info->temp_max = min_max[1];
 733         }
 734
 735         /*
 736          * The below code uses raw of-data parsing to parse
 737          * /schemas/types.yaml#/definitions/uint32-matrix
 738          * data, so for now this is only support with of.
 739          */
 740         if (!battery_np)
 741                 goto out_ret_pointer;
 742
 743         len = of_property_count_u32_elems(battery_np, "ocv-capacity-celsius");
 744         if (len < 0 && len != -EINVAL) {
 745                 err = len;
 746                 goto out_put_node;
 747         } else if (len > POWER_SUPPLY_OCV_TEMP_MAX) {
 748                 dev_err(&psy->dev, "Too many temperature values\n");
 749                 err = -EINVAL;
 750                 goto out_put_node;
 751         } else if (len > 0) {
 752                 of_property_read_u32_array(battery_np, "ocv-capacity-celsius",
 753                                            info->ocv_temp, len);
 754         }
 755
 756         for (index = 0; index < len; index++) {
 757                 struct power_supply_battery_ocv_table *table;
 758                 int i, tab_len, size;
 759
 760                 char *propname __free(kfree) = kasprintf(GFP_KERNEL, "ocv-capacity-table-%d",
 761                                                          index);
 762                 if (!propname) {
 763                         power_supply_put_battery_info(psy, info);
 764                         err = -ENOMEM;
 765                         goto out_put_node;
 766                 }
 767                 list = of_get_property(battery_np, propname, &size);
 768                 if (!list || !size) {
 769                         dev_err(&psy->dev, "failed to get %s\n", propname);
 770                         power_supply_put_battery_info(psy, info);
 771                         err = -EINVAL;
 772                         goto out_put_node;
 773                 }
 774
 775                 tab_len = size / (2 * sizeof(__be32));
 776                 info->ocv_table_size[index] = tab_len;
 777
 778                 info->ocv_table[index] = table =
 779                         devm_kcalloc(&psy->dev, tab_len, sizeof(*table), GFP_KERNEL);
 780                 if (!info->ocv_table[index]) {
 781                         power_supply_put_battery_info(psy, info);
 782                         err = -ENOMEM;
 783                         goto out_put_node;
 784                 }
 785
 786                 for (i = 0; i < tab_len; i++) {
 787                         table[i].ocv = be32_to_cpu(*list);
 788                         list++;
 789                         table[i].capacity = be32_to_cpu(*list);
 790                         list++;
 791                 }
 792         }
 793
 794         list = of_get_property(battery_np, "resistance-temp-table", &len);
 795         if (!list || !len)
 796                 goto out_ret_pointer;
 797
 798         info->resist_table_size = len / (2 * sizeof(__be32));
 799         info->resist_table = resist_table = devm_kcalloc(&psy->dev,
 800                                                          info->resist_table_size,
 801                                                          sizeof(*resist_table),
 802                                                          GFP_KERNEL);
 803         if (!info->resist_table) {
 804                 power_supply_put_battery_info(psy, info);
 805                 err = -ENOMEM;
 806                 goto out_put_node;
 807         }
 808
 809         for (index = 0; index < info->resist_table_size; index++) {
 810                 resist_table[index].temp = be32_to_cpu(*list++);
 811                 resist_table[index].resistance = be32_to_cpu(*list++);
 812         }
 813
 814 out_ret_pointer:
 815         /* Finally return the whole thing */
 816         *info_out = info;
 817
 818 out_put_node:
 819         fwnode_handle_put(fwnode);
 820         of_node_put(battery_np);
 821         return err;
 822 }
 823 EXPORT_SYMBOL_GPL(power_supply_get_battery_info);
 824
 825 void power_supply_put_battery_info(struct power_supply *psy,
 826                                    struct power_supply_battery_info *info)
 827 {
 828         int i;
 829
 830         for (i = 0; i < POWER_SUPPLY_OCV_TEMP_MAX; i++) {
 831                 if (info->ocv_table[i])
 832                         devm_kfree(&psy->dev, info->ocv_table[i]);
 833         }
 834
 835         if (info->resist_table)
 836                 devm_kfree(&psy->dev, info->resist_table);
 837
 838         devm_kfree(&psy->dev, info);
 839 }
 840 EXPORT_SYMBOL_GPL(power_supply_put_battery_info);
 841
 842 const enum power_supply_property power_supply_battery_info_properties[] = {
 843         POWER_SUPPLY_PROP_TECHNOLOGY,
 844         POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
 845         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 846         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 847         POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
 848         POWER_SUPPLY_PROP_PRECHARGE_CURRENT,
 849         POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT,
 850         POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
 851         POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
 852         POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MIN,
 853         POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MAX,
 854         POWER_SUPPLY_PROP_TEMP_ALERT_MIN,
 855         POWER_SUPPLY_PROP_TEMP_ALERT_MAX,
 856         POWER_SUPPLY_PROP_TEMP_MIN,
 857         POWER_SUPPLY_PROP_TEMP_MAX,
 858 };
 859 EXPORT_SYMBOL_GPL(power_supply_battery_info_properties);
 860
 861 const size_t power_supply_battery_info_properties_size = ARRAY_SIZE(power_supply_battery_info_properties);
 862 EXPORT_SYMBOL_GPL(power_supply_battery_info_properties_size);
 863
 864 bool power_supply_battery_info_has_prop(struct power_supply_battery_info *info,
 865                                         enum power_supply_property psp)
 866 {
 867         if (!info)
 868                 return false;
 869
 870         switch (psp) {
 871         case POWER_SUPPLY_PROP_TECHNOLOGY:
 872                 return info->technology != POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
 873         case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
 874                 return info->energy_full_design_uwh >= 0;
 875         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 876                 return info->charge_full_design_uah >= 0;
 877         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 878                 return info->voltage_min_design_uv >= 0;
 879         case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
 880                 return info->voltage_max_design_uv >= 0;
 881         case POWER_SUPPLY_PROP_PRECHARGE_CURRENT:
 882                 return info->precharge_current_ua >= 0;
 883         case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
 884                 return info->charge_term_current_ua >= 0;
 885         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
 886                 return info->constant_charge_current_max_ua >= 0;
 887         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
 888                 return info->constant_charge_voltage_max_uv >= 0;
 889         case POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MIN:
 890                 return info->temp_ambient_alert_min > INT_MIN;
 891         case POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MAX:
 892                 return info->temp_ambient_alert_max < INT_MAX;
 893         case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
 894                 return info->temp_alert_min > INT_MIN;
 895         case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
 896                 return info->temp_alert_max < INT_MAX;
 897         case POWER_SUPPLY_PROP_TEMP_MIN:
 898                 return info->temp_min > INT_MIN;
 899         case POWER_SUPPLY_PROP_TEMP_MAX:
 900                 return info->temp_max < INT_MAX;
 901         default:
 902                 return false;
 903         }
 904 }
 905 EXPORT_SYMBOL_GPL(power_supply_battery_info_has_prop);
 906
 907 int power_supply_battery_info_get_prop(struct power_supply_battery_info *info,
 908                                        enum power_supply_property psp,
 909                                        union power_supply_propval *val)
 910 {
 911         if (!info)
 912                 return -EINVAL;
 913
 914         if (!power_supply_battery_info_has_prop(info, psp))
 915                 return -EINVAL;
 916
 917         switch (psp) {
 918         case POWER_SUPPLY_PROP_TECHNOLOGY:
 919                 val->intval = info->technology;
 920                 return 0;
 921         case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
 922                 val->intval = info->energy_full_design_uwh;
 923                 return 0;
 924         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 925                 val->intval = info->charge_full_design_uah;
 926                 return 0;
 927         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 928                 val->intval = info->voltage_min_design_uv;
 929                 return 0;
 930         case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
 931                 val->intval = info->voltage_max_design_uv;
 932                 return 0;
 933         case POWER_SUPPLY_PROP_PRECHARGE_CURRENT:
 934                 val->intval = info->precharge_current_ua;
 935                 return 0;
 936         case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
 937                 val->intval = info->charge_term_current_ua;
 938                 return 0;
 939         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
 940                 val->intval = info->constant_charge_current_max_ua;
 941                 return 0;
 942         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
 943                 val->intval = info->constant_charge_voltage_max_uv;
 944                 return 0;
 945         case POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MIN:
 946                 val->intval = info->temp_ambient_alert_min;
 947                 return 0;
 948         case POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MAX:
 949                 val->intval = info->temp_ambient_alert_max;
 950                 return 0;
 951         case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
 952                 val->intval = info->temp_alert_min;
 953                 return 0;
 954         case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
 955                 val->intval = info->temp_alert_max;
 956                 return 0;
 957         case POWER_SUPPLY_PROP_TEMP_MIN:
 958                 val->intval = info->temp_min;
 959                 return 0;
 960         case POWER_SUPPLY_PROP_TEMP_MAX:
 961                 val->intval = info->temp_max;
 962                 return 0;
 963         default:
 964                 return -EINVAL;
 965         }
 966 }
 967 EXPORT_SYMBOL_GPL(power_supply_battery_info_get_prop);
 968
 969 /**
 970  * power_supply_temp2resist_simple() - find the battery internal resistance
 971  * percent from temperature
 972  * @table: Pointer to battery resistance temperature table
 973  * @table_len: The table length
 974  * @temp: Current temperature
 975  *
 976  * This helper function is used to look up battery internal resistance percent
 977  * according to current temperature value from the resistance temperature table,
 978  * and the table must be ordered descending. Then the actual battery internal
 979  * resistance = the ideal battery internal resistance * percent / 100.
 980  *
 981  * Return: the battery internal resistance percent
 982  */
 983 int power_supply_temp2resist_simple(const struct power_supply_resistance_temp_table *table,
 984                                     int table_len, int temp)
 985 {
 986         int i, high, low;
 987
 988         for (i = 0; i < table_len; i++)
 989                 if (temp > table[i].temp)
 990                         break;
 991
 992         /* The library function will deal with high == low */
 993         if (i == 0)
 994                 high = low = i;
 995         else if (i == table_len)
 996                 high = low = i - 1;
 997         else
 998                 high = (low = i) - 1;
 999
1000         return fixp_linear_interpolate(table[low].temp,
1001                                        table[low].resistance,
1002                                        table[high].temp,
1003                                        table[high].resistance,
1004                                        temp);
1005 }
1006 EXPORT_SYMBOL_GPL(power_supply_temp2resist_simple);
1007
1008 /**
1009  * power_supply_vbat2ri() - find the battery internal resistance
1010  * from the battery voltage
1011  * @info: The battery information container
1012  * @vbat_uv: The battery voltage in microvolt
1013  * @charging: If we are charging (true) or not (false)
1014  *
1015  * This helper function is used to look up battery internal resistance
1016  * according to current battery voltage. Depending on whether the battery
1017  * is currently charging or not, different resistance will be returned.
1018  *
1019  * Returns the internal resistance in microohm or negative error code.
1020  */
1021 int power_supply_vbat2ri(struct power_supply_battery_info *info,
1022                          int vbat_uv, bool charging)
1023 {
1024         const struct power_supply_vbat_ri_table *vbat2ri;
1025         int table_len;
1026         int i, high, low;
1027
1028         /*
1029          * If we are charging, and the battery supplies a separate table
1030          * for this state, we use that in order to compensate for the
1031          * charging voltage. Otherwise we use the main table.
1032          */
1033         if (charging && info->vbat2ri_charging) {
1034                 vbat2ri = info->vbat2ri_charging;
1035                 table_len = info->vbat2ri_charging_size;
1036         } else {
1037                 vbat2ri = info->vbat2ri_discharging;
1038                 table_len = info->vbat2ri_discharging_size;
1039         }
1040
1041         /*
1042          * If no tables are specified, or if we are above the highest voltage in
1043          * the voltage table, just return the factory specified internal resistance.
1044          */
1045         if (!vbat2ri || (table_len <= 0) || (vbat_uv > vbat2ri[0].vbat_uv)) {
1046                 if (charging && (info->factory_internal_resistance_charging_uohm > 0))
1047                         return info->factory_internal_resistance_charging_uohm;
1048                 else
1049                         return info->factory_internal_resistance_uohm;
1050         }
1051
1052         /* Break loop at table_len - 1 because that is the highest index */
1053         for (i = 0; i < table_len - 1; i++)
1054                 if (vbat_uv > vbat2ri[i].vbat_uv)
1055                         break;
1056
1057         /* The library function will deal with high == low */
1058         if ((i == 0) || (i == (table_len - 1)))
1059                 high = i;
1060         else
1061                 high = i - 1;
1062         low = i;
1063
1064         return fixp_linear_interpolate(vbat2ri[low].vbat_uv,
1065                                        vbat2ri[low].ri_uohm,
1066                                        vbat2ri[high].vbat_uv,
1067                                        vbat2ri[high].ri_uohm,
1068                                        vbat_uv);
1069 }
1070 EXPORT_SYMBOL_GPL(power_supply_vbat2ri);
1071
1072 const struct power_supply_maintenance_charge_table *
1073 power_supply_get_maintenance_charging_setting(struct power_supply_battery_info *info,
1074                                               int index)
1075 {
1076         if (index >= info->maintenance_charge_size)
1077                 return NULL;
1078         return &info->maintenance_charge[index];
1079 }
1080 EXPORT_SYMBOL_GPL(power_supply_get_maintenance_charging_setting);
1081
1082 /**
1083  * power_supply_ocv2cap_simple() - find the battery capacity
1084  * @table: Pointer to battery OCV lookup table
1085  * @table_len: OCV table length
1086  * @ocv: Current OCV value
1087  *
1088  * This helper function is used to look up battery capacity according to
1089  * current OCV value from one OCV table, and the OCV table must be ordered
1090  * descending.
1091  *
1092  * Return: the battery capacity.
1093  */
1094 int power_supply_ocv2cap_simple(const struct power_supply_battery_ocv_table *table,
1095                                 int table_len, int ocv)
1096 {
1097         int i, high, low;
1098
1099         for (i = 0; i < table_len; i++)
1100                 if (ocv > table[i].ocv)
1101                         break;
1102
1103         /* The library function will deal with high == low */
1104         if (i == 0)
1105                 high = low = i;
1106         else if (i == table_len)
1107                 high = low = i - 1;
1108         else
1109                 high = (low = i) - 1;
1110
1111         return fixp_linear_interpolate(table[low].ocv,
1112                                        table[low].capacity,
1113                                        table[high].ocv,
1114                                        table[high].capacity,
1115                                        ocv);
1116 }
1117 EXPORT_SYMBOL_GPL(power_supply_ocv2cap_simple);
1118
1119 const struct power_supply_battery_ocv_table *
1120 power_supply_find_ocv2cap_table(struct power_supply_battery_info *info,
1121                                 int temp, int *table_len)
1122 {
1123         int best_temp_diff = INT_MAX, temp_diff;
1124         u8 i, best_index = 0;
1125
1126         if (!info->ocv_table[0])
1127                 return NULL;
1128
1129         for (i = 0; i < POWER_SUPPLY_OCV_TEMP_MAX; i++) {
1130                 /* Out of capacity tables */
1131                 if (!info->ocv_table[i])
1132                         break;
1133
1134                 temp_diff = abs(info->ocv_temp[i] - temp);
1135
1136                 if (temp_diff < best_temp_diff) {
1137                         best_temp_diff = temp_diff;
1138                         best_index = i;
1139                 }
1140         }
1141
1142         *table_len = info->ocv_table_size[best_index];
1143         return info->ocv_table[best_index];
1144 }
1145 EXPORT_SYMBOL_GPL(power_supply_find_ocv2cap_table);
1146
1147 int power_supply_batinfo_ocv2cap(struct power_supply_battery_info *info,
1148                                  int ocv, int temp)
1149 {
1150         const struct power_supply_battery_ocv_table *table;
1151         int table_len;
1152
1153         table = power_supply_find_ocv2cap_table(info, temp, &table_len);
1154         if (!table)
1155                 return -EINVAL;
1156
1157         return power_supply_ocv2cap_simple(table, table_len, ocv);
1158 }
1159 EXPORT_SYMBOL_GPL(power_supply_batinfo_ocv2cap);
1160
1161 bool power_supply_battery_bti_in_range(struct power_supply_battery_info *info,
1162                                        int resistance)
1163 {
1164         int low, high;
1165
1166         /* Nothing like this can be checked */
1167         if (info->bti_resistance_ohm <= 0)
1168                 return false;
1169
1170         /* This will be extremely strict and unlikely to work */
1171         if (info->bti_resistance_tolerance <= 0)
1172                 return (info->bti_resistance_ohm == resistance);
1173
1174         low = info->bti_resistance_ohm -
1175                 (info->bti_resistance_ohm * info->bti_resistance_tolerance) / 100;
1176         high = info->bti_resistance_ohm +
1177                 (info->bti_resistance_ohm * info->bti_resistance_tolerance) / 100;
1178
1179         return ((resistance >= low) && (resistance <= high));
1180 }
1181 EXPORT_SYMBOL_GPL(power_supply_battery_bti_in_range);
1182
1183 static bool psy_has_property(const struct power_supply_desc *psy_desc,
1184                              enum power_supply_property psp)
1185 {
1186         bool found = false;
1187         int i;
1188
1189         for (i = 0; i < psy_desc->num_properties; i++) {
1190                 if (psy_desc->properties[i] == psp) {
1191                         found = true;
1192                         break;
1193                 }
1194         }
1195
1196         return found;
1197 }
1198
1199 int power_supply_get_property(struct power_supply *psy,
1200                             enum power_supply_property psp,
1201                             union power_supply_propval *val)
1202 {
1203         if (atomic_read(&psy->use_cnt) <= 0) {
1204                 if (!psy->initialized)
1205                         return -EAGAIN;
1206                 return -ENODEV;
1207         }
1208
1209         if (psy_has_property(psy->desc, psp))
1210                 return psy->desc->get_property(psy, psp, val);
1211         else if (power_supply_battery_info_has_prop(psy->battery_info, psp))
1212                 return power_supply_battery_info_get_prop(psy->battery_info, psp, val);
1213         else
1214                 return -EINVAL;
1215 }
1216 EXPORT_SYMBOL_GPL(power_supply_get_property);
1217
1218 int power_supply_set_property(struct power_supply *psy,
1219                             enum power_supply_property psp,
1220                             const union power_supply_propval *val)
1221 {
1222         if (atomic_read(&psy->use_cnt) <= 0 || !psy->desc->set_property)
1223                 return -ENODEV;
1224
1225         return psy->desc->set_property(psy, psp, val);
1226 }
1227 EXPORT_SYMBOL_GPL(power_supply_set_property);
1228
1229 int power_supply_property_is_writeable(struct power_supply *psy,
1230                                         enum power_supply_property psp)
1231 {
1232         return psy->desc->property_is_writeable && psy->desc->property_is_writeable(psy, psp);
1233 }
1234
1235 void power_supply_external_power_changed(struct power_supply *psy)
1236 {
1237         if (atomic_read(&psy->use_cnt) <= 0 ||
1238                         !psy->desc->external_power_changed)
1239                 return;
1240
1241         psy->desc->external_power_changed(psy);
1242 }
1243 EXPORT_SYMBOL_GPL(power_supply_external_power_changed);
1244
1245 int power_supply_powers(struct power_supply *psy, struct device *dev)
1246 {
1247         return sysfs_create_link(&psy->dev.kobj, &dev->kobj, "powers");
1248 }
1249 EXPORT_SYMBOL_GPL(power_supply_powers);
1250
1251 static void power_supply_dev_release(struct device *dev)
1252 {
1253         struct power_supply *psy = to_power_supply(dev);
1254
1255         dev_dbg(dev, "%s\n", __func__);
1256         kfree(psy);
1257 }
1258
1259 int power_supply_reg_notifier(struct notifier_block *nb)
1260 {
1261         return blocking_notifier_chain_register(&power_supply_notifier, nb);
1262 }
1263 EXPORT_SYMBOL_GPL(power_supply_reg_notifier);
1264
1265 void power_supply_unreg_notifier(struct notifier_block *nb)
1266 {
1267         blocking_notifier_chain_unregister(&power_supply_notifier, nb);
1268 }
1269 EXPORT_SYMBOL_GPL(power_supply_unreg_notifier);
1270
1271 #ifdef CONFIG_THERMAL
1272 static int power_supply_read_temp(struct thermal_zone_device *tzd,
1273                 int *temp)
1274 {
1275         struct power_supply *psy;
1276         union power_supply_propval val;
1277         int ret;
1278
1279         WARN_ON(tzd == NULL);
1280         psy = thermal_zone_device_priv(tzd);
1281         ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_TEMP, &val);
1282         if (ret)
1283                 return ret;
1284
1285         /* Convert tenths of degree Celsius to milli degree Celsius. */
1286         *temp = val.intval * 100;
1287
1288         return ret;
1289 }
1290
1291 static const struct thermal_zone_device_ops psy_tzd_ops = {
1292         .get_temp = power_supply_read_temp,
1293 };
1294
1295 static int psy_register_thermal(struct power_supply *psy)
1296 {
1297         int ret;
1298
1299         if (psy->desc->no_thermal)
1300                 return 0;
1301
1302         /* Register battery zone device psy reports temperature */
1303         if (psy_has_property(psy->desc, POWER_SUPPLY_PROP_TEMP)) {
1304                 /* Prefer our hwmon device and avoid duplicates */
1305                 struct thermal_zone_params tzp = {
1306                         .no_hwmon = IS_ENABLED(CONFIG_POWER_SUPPLY_HWMON)
1307                 };
1308                 psy->tzd = thermal_tripless_zone_device_register(psy->desc->name,
1309                                 psy, &psy_tzd_ops, &tzp);
1310                 if (IS_ERR(psy->tzd))
1311                         return PTR_ERR(psy->tzd);
1312                 ret = thermal_zone_device_enable(psy->tzd);
1313                 if (ret)
1314                         thermal_zone_device_unregister(psy->tzd);
1315                 return ret;
1316         }
1317
1318         return 0;
1319 }
1320
1321 static void psy_unregister_thermal(struct power_supply *psy)
1322 {
1323         if (IS_ERR_OR_NULL(psy->tzd))
1324                 return;
1325         thermal_zone_device_unregister(psy->tzd);
1326 }
1327
1328 #else
1329 static int psy_register_thermal(struct power_supply *psy)
1330 {
1331         return 0;
1332 }
1333
1334 static void psy_unregister_thermal(struct power_supply *psy)
1335 {
1336 }
1337 #endif
1338
1339 static struct power_supply *__must_check
1340 __power_supply_register(struct device *parent,
1341                                    const struct power_supply_desc *desc,
1342                                    const struct power_supply_config *cfg)
1343 {
1344         struct device *dev;
1345         struct power_supply *psy;
1346         int rc;
1347
1348         if (!desc || !desc->name || !desc->properties || !desc->num_properties)
1349                 return ERR_PTR(-EINVAL);
1350
1351         if (!parent)
1352                 pr_warn("%s: Expected proper parent device for '%s'\n",
1353                         __func__, desc->name);
1354
1355         psy = kzalloc(sizeof(*psy), GFP_KERNEL);
1356         if (!psy)
1357                 return ERR_PTR(-ENOMEM);
1358
1359         dev = &psy->dev;
1360
1361         device_initialize(dev);
1362
1363         dev->class = &power_supply_class;
1364         dev->type = &power_supply_dev_type;
1365         dev->parent = parent;
1366         dev->release = power_supply_dev_release;
1367         dev_set_drvdata(dev, psy);
1368         psy->desc = desc;
1369         if (cfg) {
1370                 dev->groups = cfg->attr_grp;
1371                 psy->drv_data = cfg->drv_data;
1372                 psy->of_node =
1373                         cfg->fwnode ? to_of_node(cfg->fwnode) : cfg->of_node;
1374                 dev->of_node = psy->of_node;
1375                 psy->supplied_to = cfg->supplied_to;
1376                 psy->num_supplicants = cfg->num_supplicants;
1377         }
1378
1379         rc = dev_set_name(dev, "%s", desc->name);
1380         if (rc)
1381                 goto dev_set_name_failed;
1382
1383         INIT_WORK(&psy->changed_work, power_supply_changed_work);
1384         INIT_DELAYED_WORK(&psy->deferred_register_work,
1385                           power_supply_deferred_register_work);
1386
1387         rc = power_supply_check_supplies(psy);
1388         if (rc) {
1389                 dev_dbg(dev, "Not all required supplies found, defer probe\n");
1390                 goto check_supplies_failed;
1391         }
1392
1393         /*
1394          * Expose constant battery info, if it is available. While there are
1395          * some chargers accessing constant battery data, we only want to
1396          * expose battery data to userspace for battery devices.
1397          */
1398         if (desc->type == POWER_SUPPLY_TYPE_BATTERY) {
1399                 rc = power_supply_get_battery_info(psy, &psy->battery_info);
1400                 if (rc && rc != -ENODEV && rc != -ENOENT)
1401                         goto check_supplies_failed;
1402         }
1403
1404         spin_lock_init(&psy->changed_lock);
1405         rc = device_add(dev);
1406         if (rc)
1407                 goto device_add_failed;
1408
1409         rc = device_init_wakeup(dev, cfg ? !cfg->no_wakeup_source : true);
1410         if (rc)
1411                 goto wakeup_init_failed;
1412
1413         rc = psy_register_thermal(psy);
1414         if (rc)
1415                 goto register_thermal_failed;
1416
1417         rc = power_supply_create_triggers(psy);
1418         if (rc)
1419                 goto create_triggers_failed;
1420
1421         rc = power_supply_add_hwmon_sysfs(psy);
1422         if (rc)
1423                 goto add_hwmon_sysfs_failed;
1424
1425         /*
1426          * Update use_cnt after any uevents (most notably from device_add()).
1427          * We are here still during driver's probe but
1428          * the power_supply_uevent() calls back driver's get_property
1429          * method so:
1430          * 1. Driver did not assigned the returned struct power_supply,
1431          * 2. Driver could not finish initialization (anything in its probe
1432          *    after calling power_supply_register()).
1433          */
1434         atomic_inc(&psy->use_cnt);
1435         psy->initialized = true;
1436
1437         queue_delayed_work(system_power_efficient_wq,
1438                            &psy->deferred_register_work,
1439                            POWER_SUPPLY_DEFERRED_REGISTER_TIME);
1440
1441         return psy;
1442
1443 add_hwmon_sysfs_failed:
1444         power_supply_remove_triggers(psy);
1445 create_triggers_failed:
1446         psy_unregister_thermal(psy);
1447 register_thermal_failed:
1448 wakeup_init_failed:
1449         device_del(dev);
1450 device_add_failed:
1451 check_supplies_failed:
1452 dev_set_name_failed:
1453         put_device(dev);
1454         return ERR_PTR(rc);
1455 }
1456
1457 /**
1458  * power_supply_register() - Register new power supply
1459  * @parent:     Device to be a parent of power supply's device, usually
1460  *              the device which probe function calls this
1461  * @desc:       Description of power supply, must be valid through whole
1462  *              lifetime of this power supply
1463  * @cfg:        Run-time specific configuration accessed during registering,
1464  *              may be NULL
1465  *
1466  * Return: A pointer to newly allocated power_supply on success
1467  * or ERR_PTR otherwise.
1468  * Use power_supply_unregister() on returned power_supply pointer to release
1469  * resources.
1470  */
1471 struct power_supply *__must_check power_supply_register(struct device *parent,
1472                 const struct power_supply_desc *desc,
1473                 const struct power_supply_config *cfg)
1474 {
1475         return __power_supply_register(parent, desc, cfg);
1476 }
1477 EXPORT_SYMBOL_GPL(power_supply_register);
1478
1479 static void devm_power_supply_release(struct device *dev, void *res)
1480 {
1481         struct power_supply **psy = res;
1482
1483         power_supply_unregister(*psy);
1484 }
1485
1486 /**
1487  * devm_power_supply_register() - Register managed power supply
1488  * @parent:     Device to be a parent of power supply's device, usually
1489  *              the device which probe function calls this
1490  * @desc:       Description of power supply, must be valid through whole
1491  *              lifetime of this power supply
1492  * @cfg:        Run-time specific configuration accessed during registering,
1493  *              may be NULL
1494  *
1495  * Return: A pointer to newly allocated power_supply on success
1496  * or ERR_PTR otherwise.
1497  * The returned power_supply pointer will be automatically unregistered
1498  * on driver detach.
1499  */
1500 struct power_supply *__must_check
1501 devm_power_supply_register(struct device *parent,
1502                 const struct power_supply_desc *desc,
1503                 const struct power_supply_config *cfg)
1504 {
1505         struct power_supply **ptr, *psy;
1506
1507         ptr = devres_alloc(devm_power_supply_release, sizeof(*ptr), GFP_KERNEL);
1508
1509         if (!ptr)
1510                 return ERR_PTR(-ENOMEM);
1511         psy = __power_supply_register(parent, desc, cfg);
1512         if (IS_ERR(psy)) {
1513                 devres_free(ptr);
1514         } else {
1515                 *ptr = psy;
1516                 devres_add(parent, ptr);
1517         }
1518         return psy;
1519 }
1520 EXPORT_SYMBOL_GPL(devm_power_supply_register);
1521
1522 /**
1523  * power_supply_unregister() - Remove this power supply from system
1524  * @psy:        Pointer to power supply to unregister
1525  *
1526  * Remove this power supply from the system. The resources of power supply
1527  * will be freed here or on last power_supply_put() call.
1528  */
1529 void power_supply_unregister(struct power_supply *psy)
1530 {
1531         WARN_ON(atomic_dec_return(&psy->use_cnt));
1532         psy->removing = true;
1533         cancel_work_sync(&psy->changed_work);
1534         cancel_delayed_work_sync(&psy->deferred_register_work);
1535         sysfs_remove_link(&psy->dev.kobj, "powers");
1536         power_supply_remove_hwmon_sysfs(psy);
1537         power_supply_remove_triggers(psy);
1538         psy_unregister_thermal(psy);
1539         device_init_wakeup(&psy->dev, false);
1540         device_unregister(&psy->dev);
1541 }
1542 EXPORT_SYMBOL_GPL(power_supply_unregister);
1543
1544 void *power_supply_get_drvdata(struct power_supply *psy)
1545 {
1546         return psy->drv_data;
1547 }
1548 EXPORT_SYMBOL_GPL(power_supply_get_drvdata);
1549
1550 static int __init power_supply_class_init(void)
1551 {
1552         power_supply_init_attrs();
1553         return class_register(&power_supply_class);
1554 }
1555
1556 static void __exit power_supply_class_exit(void)
1557 {
1558         class_unregister(&power_supply_class);
1559 }
1560
1561 subsys_initcall(power_supply_class_init);
1562 module_exit(power_supply_class_exit);
1563
1564 MODULE_DESCRIPTION("Universal power supply monitor class");
1565 MODULE_AUTHOR("Ian Molton <[email protected]>");
1566 MODULE_AUTHOR("Szabolcs Gyurko");
1567 MODULE_AUTHOR("Anton Vorontsov <[email protected]>");