drivers/power/supply/power_supply_core.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  Universal power supply monitor class
   4  *
   5  *  Copyright © 2007  Anton Vorontsov <cbou@mail.ru>
   6  *  Copyright © 2004  Szabolcs Gyurko
   7  *  Copyright © 2003  Ian Molton <spyro@f2s.com>
   8  *
   9  *  Modified: 2004, Oct     Szabolcs Gyurko
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/types.h>
  14 #include <linux/init.h>
  15 #include <linux/slab.h>
  16 #include <linux/delay.h>
  17 #include <linux/device.h>
  18 #include <linux/notifier.h>
  19 #include <linux/err.h>
  20 #include <linux/of.h>
  21 #include <linux/power_supply.h>
  22 #include <linux/property.h>
  23 #include <linux/thermal.h>
  24 #include <linux/fixp-arith.h>
  25 #include "power_supply.h"
  26 #include "samsung-sdi-battery.h"
  27
  28 static const struct class power_supply_class = {
  29         .name = "power_supply",
  30         .dev_uevent = power_supply_uevent,
  31 };
  32
  33 static BLOCKING_NOTIFIER_HEAD(power_supply_notifier);
  34
  35 __ATTRIBUTE_GROUPS(power_supply_attr);
  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 (!mutex_trylock(&psy->dev.parent->mutex)) {
 156                         if (psy->removing)
 157                                 return;
 158                         msleep(10);
 159                 }
 160         }
 161
 162         power_supply_changed(psy);
 163
 164         if (psy->dev.parent)
 165                 mutex_unlock(&psy->dev.parent->mutex);
 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         might_sleep();
 488
 489         atomic_dec(&psy->use_cnt);
 490         put_device(&psy->dev);
 491 }
 492 EXPORT_SYMBOL_GPL(power_supply_put);
 493
 494 #ifdef CONFIG_OF
 495 static int power_supply_match_device_node(struct device *dev, const void *data)
 496 {
 497         return dev->parent && dev->parent->of_node == data;
 498 }
 499
 500 /**
 501  * power_supply_get_by_phandle() - Search for a power supply and returns its ref
 502  * @np: Pointer to device node holding phandle property
 503  * @property: Name of property holding a power supply name
 504  *
 505  * If power supply was found, it increases reference count for the
 506  * internal power supply's device. The user should power_supply_put()
 507  * after usage.
 508  *
 509  * Return: On success returns a reference to a power supply with
 510  * matching name equals to value under @property, NULL or ERR_PTR otherwise.
 511  */
 512 struct power_supply *power_supply_get_by_phandle(struct device_node *np,
 513                                                         const char *property)
 514 {
 515         struct device_node *power_supply_np;
 516         struct power_supply *psy = NULL;
 517         struct device *dev;
 518
 519         power_supply_np = of_parse_phandle(np, property, 0);
 520         if (!power_supply_np)
 521                 return ERR_PTR(-ENODEV);
 522
 523         dev = class_find_device(&power_supply_class, NULL, power_supply_np,
 524                                 power_supply_match_device_node);
 525
 526         of_node_put(power_supply_np);
 527
 528         if (dev) {
 529                 psy = dev_get_drvdata(dev);
 530                 atomic_inc(&psy->use_cnt);
 531         }
 532
 533         return psy;
 534 }
 535 EXPORT_SYMBOL_GPL(power_supply_get_by_phandle);
 536
 537 static void devm_power_supply_put(struct device *dev, void *res)
 538 {
 539         struct power_supply **psy = res;
 540
 541         power_supply_put(*psy);
 542 }
 543
 544 /**
 545  * devm_power_supply_get_by_phandle() - Resource managed version of
 546  *  power_supply_get_by_phandle()
 547  * @dev: Pointer to device holding phandle property
 548  * @property: Name of property holding a power supply phandle
 549  *
 550  * Return: On success returns a reference to a power supply with
 551  * matching name equals to value under @property, NULL or ERR_PTR otherwise.
 552  */
 553 struct power_supply *devm_power_supply_get_by_phandle(struct device *dev,
 554                                                       const char *property)
 555 {
 556         struct power_supply **ptr, *psy;
 557
 558         if (!dev->of_node)
 559                 return ERR_PTR(-ENODEV);
 560
 561         ptr = devres_alloc(devm_power_supply_put, sizeof(*ptr), GFP_KERNEL);
 562         if (!ptr)
 563                 return ERR_PTR(-ENOMEM);
 564
 565         psy = power_supply_get_by_phandle(dev->of_node, property);
 566         if (IS_ERR_OR_NULL(psy)) {
 567                 devres_free(ptr);
 568         } else {
 569                 *ptr = psy;
 570                 devres_add(dev, ptr);
 571         }
 572         return psy;
 573 }
 574 EXPORT_SYMBOL_GPL(devm_power_supply_get_by_phandle);
 575 #endif /* CONFIG_OF */
 576
 577 int power_supply_get_battery_info(struct power_supply *psy,
 578                                   struct power_supply_battery_info **info_out)
 579 {
 580         struct power_supply_resistance_temp_table *resist_table;
 581         struct power_supply_battery_info *info;
 582         struct device_node *battery_np = NULL;
 583         struct fwnode_reference_args args;
 584         struct fwnode_handle *fwnode = NULL;
 585         const char *value;
 586         int err, len, index;
 587         const __be32 *list;
 588         u32 min_max[2];
 589
 590         if (psy->of_node) {
 591                 battery_np = of_parse_phandle(psy->of_node, "monitored-battery", 0);
 592                 if (!battery_np)
 593                         return -ENODEV;
 594
 595                 fwnode = fwnode_handle_get(of_fwnode_handle(battery_np));
 596         } else if (psy->dev.parent) {
 597                 err = fwnode_property_get_reference_args(
 598                                         dev_fwnode(psy->dev.parent),
 599                                         "monitored-battery", NULL, 0, 0, &args);
 600                 if (err)
 601                         return err;
 602
 603                 fwnode = args.fwnode;
 604         }
 605
 606         if (!fwnode)
 607                 return -ENOENT;
 608
 609         err = fwnode_property_read_string(fwnode, "compatible", &value);
 610         if (err)
 611                 goto out_put_node;
 612
 613
 614         /* Try static batteries first */
 615         err = samsung_sdi_battery_get_info(&psy->dev, value, &info);
 616         if (!err)
 617                 goto out_ret_pointer;
 618         else if (err == -ENODEV)
 619                 /*
 620                  * Device does not have a static battery.
 621                  * Proceed to look for a simple battery.
 622                  */
 623                 err = 0;
 624
 625         if (strcmp("simple-battery", value)) {
 626                 err = -ENODEV;
 627                 goto out_put_node;
 628         }
 629
 630         info = devm_kzalloc(&psy->dev, sizeof(*info), GFP_KERNEL);
 631         if (!info) {
 632                 err = -ENOMEM;
 633                 goto out_put_node;
 634         }
 635
 636         info->technology                     = POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
 637         info->energy_full_design_uwh         = -EINVAL;
 638         info->charge_full_design_uah         = -EINVAL;
 639         info->voltage_min_design_uv          = -EINVAL;
 640         info->voltage_max_design_uv          = -EINVAL;
 641         info->precharge_current_ua           = -EINVAL;
 642         info->charge_term_current_ua         = -EINVAL;
 643         info->constant_charge_current_max_ua = -EINVAL;
 644         info->constant_charge_voltage_max_uv = -EINVAL;
 645         info->tricklecharge_current_ua       = -EINVAL;
 646         info->precharge_voltage_max_uv       = -EINVAL;
 647         info->charge_restart_voltage_uv      = -EINVAL;
 648         info->overvoltage_limit_uv           = -EINVAL;
 649         info->maintenance_charge             = NULL;
 650         info->alert_low_temp_charge_current_ua = -EINVAL;
 651         info->alert_low_temp_charge_voltage_uv = -EINVAL;
 652         info->alert_high_temp_charge_current_ua = -EINVAL;
 653         info->alert_high_temp_charge_voltage_uv = -EINVAL;
 654         info->temp_ambient_alert_min         = INT_MIN;
 655         info->temp_ambient_alert_max         = INT_MAX;
 656         info->temp_alert_min                 = INT_MIN;
 657         info->temp_alert_max                 = INT_MAX;
 658         info->temp_min                       = INT_MIN;
 659         info->temp_max                       = INT_MAX;
 660         info->factory_internal_resistance_uohm  = -EINVAL;
 661         info->resist_table                   = NULL;
 662         info->bti_resistance_ohm             = -EINVAL;
 663         info->bti_resistance_tolerance       = -EINVAL;
 664
 665         for (index = 0; index < POWER_SUPPLY_OCV_TEMP_MAX; index++) {
 666                 info->ocv_table[index]       = NULL;
 667                 info->ocv_temp[index]        = -EINVAL;
 668                 info->ocv_table_size[index]  = -EINVAL;
 669         }
 670
 671         /* The property and field names below must correspond to elements
 672          * in enum power_supply_property. For reasoning, see
 673          * Documentation/power/power_supply_class.rst.
 674          */
 675
 676         if (!fwnode_property_read_string(fwnode, "device-chemistry", &value)) {
 677                 if (!strcmp("nickel-cadmium", value))
 678                         info->technology = POWER_SUPPLY_TECHNOLOGY_NiCd;
 679                 else if (!strcmp("nickel-metal-hydride", value))
 680                         info->technology = POWER_SUPPLY_TECHNOLOGY_NiMH;
 681                 else if (!strcmp("lithium-ion", value))
 682                         /* Imprecise lithium-ion type */
 683                         info->technology = POWER_SUPPLY_TECHNOLOGY_LION;
 684                 else if (!strcmp("lithium-ion-polymer", value))
 685                         info->technology = POWER_SUPPLY_TECHNOLOGY_LIPO;
 686                 else if (!strcmp("lithium-ion-iron-phosphate", value))
 687                         info->technology = POWER_SUPPLY_TECHNOLOGY_LiFe;
 688                 else if (!strcmp("lithium-ion-manganese-oxide", value))
 689                         info->technology = POWER_SUPPLY_TECHNOLOGY_LiMn;
 690                 else
 691                         dev_warn(&psy->dev, "%s unknown battery type\n", value);
 692         }
 693
 694         fwnode_property_read_u32(fwnode, "energy-full-design-microwatt-hours",
 695                              &info->energy_full_design_uwh);
 696         fwnode_property_read_u32(fwnode, "charge-full-design-microamp-hours",
 697                              &info->charge_full_design_uah);
 698         fwnode_property_read_u32(fwnode, "voltage-min-design-microvolt",
 699                              &info->voltage_min_design_uv);
 700         fwnode_property_read_u32(fwnode, "voltage-max-design-microvolt",
 701                              &info->voltage_max_design_uv);
 702         fwnode_property_read_u32(fwnode, "trickle-charge-current-microamp",
 703                              &info->tricklecharge_current_ua);
 704         fwnode_property_read_u32(fwnode, "precharge-current-microamp",
 705                              &info->precharge_current_ua);
 706         fwnode_property_read_u32(fwnode, "precharge-upper-limit-microvolt",
 707                              &info->precharge_voltage_max_uv);
 708         fwnode_property_read_u32(fwnode, "charge-term-current-microamp",
 709                              &info->charge_term_current_ua);
 710         fwnode_property_read_u32(fwnode, "re-charge-voltage-microvolt",
 711                              &info->charge_restart_voltage_uv);
 712         fwnode_property_read_u32(fwnode, "over-voltage-threshold-microvolt",
 713                              &info->overvoltage_limit_uv);
 714         fwnode_property_read_u32(fwnode, "constant-charge-current-max-microamp",
 715                              &info->constant_charge_current_max_ua);
 716         fwnode_property_read_u32(fwnode, "constant-charge-voltage-max-microvolt",
 717                              &info->constant_charge_voltage_max_uv);
 718         fwnode_property_read_u32(fwnode, "factory-internal-resistance-micro-ohms",
 719                              &info->factory_internal_resistance_uohm);
 720
 721         if (!fwnode_property_read_u32_array(fwnode, "ambient-celsius",
 722                                             min_max, ARRAY_SIZE(min_max))) {
 723                 info->temp_ambient_alert_min = min_max[0];
 724                 info->temp_ambient_alert_max = min_max[1];
 725         }
 726         if (!fwnode_property_read_u32_array(fwnode, "alert-celsius",
 727                                             min_max, ARRAY_SIZE(min_max))) {
 728                 info->temp_alert_min = min_max[0];
 729                 info->temp_alert_max = min_max[1];
 730         }
 731         if (!fwnode_property_read_u32_array(fwnode, "operating-range-celsius",
 732                                             min_max, ARRAY_SIZE(min_max))) {
 733                 info->temp_min = min_max[0];
 734                 info->temp_max = min_max[1];
 735         }
 736
 737         /*
 738          * The below code uses raw of-data parsing to parse
 739          * /schemas/types.yaml#/definitions/uint32-matrix
 740          * data, so for now this is only support with of.
 741          */
 742         if (!battery_np)
 743                 goto out_ret_pointer;
 744
 745         len = of_property_count_u32_elems(battery_np, "ocv-capacity-celsius");
 746         if (len < 0 && len != -EINVAL) {
 747                 err = len;
 748                 goto out_put_node;
 749         } else if (len > POWER_SUPPLY_OCV_TEMP_MAX) {
 750                 dev_err(&psy->dev, "Too many temperature values\n");
 751                 err = -EINVAL;
 752                 goto out_put_node;
 753         } else if (len > 0) {
 754                 of_property_read_u32_array(battery_np, "ocv-capacity-celsius",
 755                                            info->ocv_temp, len);
 756         }
 757
 758         for (index = 0; index < len; index++) {
 759                 struct power_supply_battery_ocv_table *table;
 760                 char *propname;
 761                 int i, tab_len, size;
 762
 763                 propname = kasprintf(GFP_KERNEL, "ocv-capacity-table-%d", index);
 764                 if (!propname) {
 765                         power_supply_put_battery_info(psy, info);
 766                         err = -ENOMEM;
 767                         goto out_put_node;
 768                 }
 769                 list = of_get_property(battery_np, propname, &size);
 770                 if (!list || !size) {
 771                         dev_err(&psy->dev, "failed to get %s\n", propname);
 772                         kfree(propname);
 773                         power_supply_put_battery_info(psy, info);
 774                         err = -EINVAL;
 775                         goto out_put_node;
 776                 }
 777
 778                 kfree(propname);
 779                 tab_len = size / (2 * sizeof(__be32));
 780                 info->ocv_table_size[index] = tab_len;
 781
 782                 table = info->ocv_table[index] =
 783                         devm_kcalloc(&psy->dev, tab_len, sizeof(*table), GFP_KERNEL);
 784                 if (!info->ocv_table[index]) {
 785                         power_supply_put_battery_info(psy, info);
 786                         err = -ENOMEM;
 787                         goto out_put_node;
 788                 }
 789
 790                 for (i = 0; i < tab_len; i++) {
 791                         table[i].ocv = be32_to_cpu(*list);
 792                         list++;
 793                         table[i].capacity = be32_to_cpu(*list);
 794                         list++;
 795                 }
 796         }
 797
 798         list = of_get_property(battery_np, "resistance-temp-table", &len);
 799         if (!list || !len)
 800                 goto out_ret_pointer;
 801
 802         info->resist_table_size = len / (2 * sizeof(__be32));
 803         resist_table = info->resist_table = devm_kcalloc(&psy->dev,
 804                                                          info->resist_table_size,
 805                                                          sizeof(*resist_table),
 806                                                          GFP_KERNEL);
 807         if (!info->resist_table) {
 808                 power_supply_put_battery_info(psy, info);
 809                 err = -ENOMEM;
 810                 goto out_put_node;
 811         }
 812
 813         for (index = 0; index < info->resist_table_size; index++) {
 814                 resist_table[index].temp = be32_to_cpu(*list++);
 815                 resist_table[index].resistance = be32_to_cpu(*list++);
 816         }
 817
 818 out_ret_pointer:
 819         /* Finally return the whole thing */
 820         *info_out = info;
 821
 822 out_put_node:
 823         fwnode_handle_put(fwnode);
 824         of_node_put(battery_np);
 825         return err;
 826 }
 827 EXPORT_SYMBOL_GPL(power_supply_get_battery_info);
 828
 829 void power_supply_put_battery_info(struct power_supply *psy,
 830                                    struct power_supply_battery_info *info)
 831 {
 832         int i;
 833
 834         for (i = 0; i < POWER_SUPPLY_OCV_TEMP_MAX; i++) {
 835                 if (info->ocv_table[i])
 836                         devm_kfree(&psy->dev, info->ocv_table[i]);
 837         }
 838
 839         if (info->resist_table)
 840                 devm_kfree(&psy->dev, info->resist_table);
 841
 842         devm_kfree(&psy->dev, info);
 843 }
 844 EXPORT_SYMBOL_GPL(power_supply_put_battery_info);
 845
 846 const enum power_supply_property power_supply_battery_info_properties[] = {
 847         POWER_SUPPLY_PROP_TECHNOLOGY,
 848         POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
 849         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 850         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 851         POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
 852         POWER_SUPPLY_PROP_PRECHARGE_CURRENT,
 853         POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT,
 854         POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
 855         POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
 856         POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MIN,
 857         POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MAX,
 858         POWER_SUPPLY_PROP_TEMP_ALERT_MIN,
 859         POWER_SUPPLY_PROP_TEMP_ALERT_MAX,
 860         POWER_SUPPLY_PROP_TEMP_MIN,
 861         POWER_SUPPLY_PROP_TEMP_MAX,
 862 };
 863 EXPORT_SYMBOL_GPL(power_supply_battery_info_properties);
 864
 865 const size_t power_supply_battery_info_properties_size = ARRAY_SIZE(power_supply_battery_info_properties);
 866 EXPORT_SYMBOL_GPL(power_supply_battery_info_properties_size);
 867
 868 bool power_supply_battery_info_has_prop(struct power_supply_battery_info *info,
 869                                         enum power_supply_property psp)
 870 {
 871         if (!info)
 872                 return false;
 873
 874         switch (psp) {
 875         case POWER_SUPPLY_PROP_TECHNOLOGY:
 876                 return info->technology != POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
 877         case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
 878                 return info->energy_full_design_uwh >= 0;
 879         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 880                 return info->charge_full_design_uah >= 0;
 881         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 882                 return info->voltage_min_design_uv >= 0;
 883         case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
 884                 return info->voltage_max_design_uv >= 0;
 885         case POWER_SUPPLY_PROP_PRECHARGE_CURRENT:
 886                 return info->precharge_current_ua >= 0;
 887         case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
 888                 return info->charge_term_current_ua >= 0;
 889         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
 890                 return info->constant_charge_current_max_ua >= 0;
 891         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
 892                 return info->constant_charge_voltage_max_uv >= 0;
 893         case POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MIN:
 894                 return info->temp_ambient_alert_min > INT_MIN;
 895         case POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MAX:
 896                 return info->temp_ambient_alert_max < INT_MAX;
 897         case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
 898                 return info->temp_alert_min > INT_MIN;
 899         case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
 900                 return info->temp_alert_max < INT_MAX;
 901         case POWER_SUPPLY_PROP_TEMP_MIN:
 902                 return info->temp_min > INT_MIN;
 903         case POWER_SUPPLY_PROP_TEMP_MAX:
 904                 return info->temp_max < INT_MAX;
 905         default:
 906                 return false;
 907         }
 908 }
 909 EXPORT_SYMBOL_GPL(power_supply_battery_info_has_prop);
 910
 911 int power_supply_battery_info_get_prop(struct power_supply_battery_info *info,
 912                                        enum power_supply_property psp,
 913                                        union power_supply_propval *val)
 914 {
 915         if (!info)
 916                 return -EINVAL;
 917
 918         if (!power_supply_battery_info_has_prop(info, psp))
 919                 return -EINVAL;
 920
 921         switch (psp) {
 922         case POWER_SUPPLY_PROP_TECHNOLOGY:
 923                 val->intval = info->technology;
 924                 return 0;
 925         case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
 926                 val->intval = info->energy_full_design_uwh;
 927                 return 0;
 928         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 929                 val->intval = info->charge_full_design_uah;
 930                 return 0;
 931         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 932                 val->intval = info->voltage_min_design_uv;
 933                 return 0;
 934         case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
 935                 val->intval = info->voltage_max_design_uv;
 936                 return 0;
 937         case POWER_SUPPLY_PROP_PRECHARGE_CURRENT:
 938                 val->intval = info->precharge_current_ua;
 939                 return 0;
 940         case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
 941                 val->intval = info->charge_term_current_ua;
 942                 return 0;
 943         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
 944                 val->intval = info->constant_charge_current_max_ua;
 945                 return 0;
 946         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
 947                 val->intval = info->constant_charge_voltage_max_uv;
 948                 return 0;
 949         case POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MIN:
 950                 val->intval = info->temp_ambient_alert_min;
 951                 return 0;
 952         case POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MAX:
 953                 val->intval = info->temp_ambient_alert_max;
 954                 return 0;
 955         case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
 956                 val->intval = info->temp_alert_min;
 957                 return 0;
 958         case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
 959                 val->intval = info->temp_alert_max;
 960                 return 0;
 961         case POWER_SUPPLY_PROP_TEMP_MIN:
 962                 val->intval = info->temp_min;
 963                 return 0;
 964         case POWER_SUPPLY_PROP_TEMP_MAX:
 965                 val->intval = info->temp_max;
 966                 return 0;
 967         default:
 968                 return -EINVAL;
 969         }
 970 }
 971 EXPORT_SYMBOL_GPL(power_supply_battery_info_get_prop);
 972
 973 /**
 974  * power_supply_temp2resist_simple() - find the battery internal resistance
 975  * percent from temperature
 976  * @table: Pointer to battery resistance temperature table
 977  * @table_len: The table length
 978  * @temp: Current temperature
 979  *
 980  * This helper function is used to look up battery internal resistance percent
 981  * according to current temperature value from the resistance temperature table,
 982  * and the table must be ordered descending. Then the actual battery internal
 983  * resistance = the ideal battery internal resistance * percent / 100.
 984  *
 985  * Return: the battery internal resistance percent
 986  */
 987 int power_supply_temp2resist_simple(struct power_supply_resistance_temp_table *table,
 988                                     int table_len, int temp)
 989 {
 990         int i, high, low;
 991
 992         for (i = 0; i < table_len; i++)
 993                 if (temp > table[i].temp)
 994                         break;
 995
 996         /* The library function will deal with high == low */
 997         if (i == 0)
 998                 high = low = i;
 999         else if (i == table_len)
1000                 high = low = i - 1;
1001         else
1002                 high = (low = i) - 1;
1003
1004         return fixp_linear_interpolate(table[low].temp,
1005                                        table[low].resistance,
1006                                        table[high].temp,
1007                                        table[high].resistance,
1008                                        temp);
1009 }
1010 EXPORT_SYMBOL_GPL(power_supply_temp2resist_simple);
1011
1012 /**
1013  * power_supply_vbat2ri() - find the battery internal resistance
1014  * from the battery voltage
1015  * @info: The battery information container
1016  * @vbat_uv: The battery voltage in microvolt
1017  * @charging: If we are charging (true) or not (false)
1018  *
1019  * This helper function is used to look up battery internal resistance
1020  * according to current battery voltage. Depending on whether the battery
1021  * is currently charging or not, different resistance will be returned.
1022  *
1023  * Returns the internal resistance in microohm or negative error code.
1024  */
1025 int power_supply_vbat2ri(struct power_supply_battery_info *info,
1026                          int vbat_uv, bool charging)
1027 {
1028         struct power_supply_vbat_ri_table *vbat2ri;
1029         int table_len;
1030         int i, high, low;
1031
1032         /*
1033          * If we are charging, and the battery supplies a separate table
1034          * for this state, we use that in order to compensate for the
1035          * charging voltage. Otherwise we use the main table.
1036          */
1037         if (charging && info->vbat2ri_charging) {
1038                 vbat2ri = info->vbat2ri_charging;
1039                 table_len = info->vbat2ri_charging_size;
1040         } else {
1041                 vbat2ri = info->vbat2ri_discharging;
1042                 table_len = info->vbat2ri_discharging_size;
1043         }
1044
1045         /*
1046          * If no tables are specified, or if we are above the highest voltage in
1047          * the voltage table, just return the factory specified internal resistance.
1048          */
1049         if (!vbat2ri || (table_len <= 0) || (vbat_uv > vbat2ri[0].vbat_uv)) {
1050                 if (charging && (info->factory_internal_resistance_charging_uohm > 0))
1051                         return info->factory_internal_resistance_charging_uohm;
1052                 else
1053                         return info->factory_internal_resistance_uohm;
1054         }
1055
1056         /* Break loop at table_len - 1 because that is the highest index */
1057         for (i = 0; i < table_len - 1; i++)
1058                 if (vbat_uv > vbat2ri[i].vbat_uv)
1059                         break;
1060
1061         /* The library function will deal with high == low */
1062         if ((i == 0) || (i == (table_len - 1)))
1063                 high = i;
1064         else
1065                 high = i - 1;
1066         low = i;
1067
1068         return fixp_linear_interpolate(vbat2ri[low].vbat_uv,
1069                                        vbat2ri[low].ri_uohm,
1070                                        vbat2ri[high].vbat_uv,
1071                                        vbat2ri[high].ri_uohm,
1072                                        vbat_uv);
1073 }
1074 EXPORT_SYMBOL_GPL(power_supply_vbat2ri);
1075
1076 struct power_supply_maintenance_charge_table *
1077 power_supply_get_maintenance_charging_setting(struct power_supply_battery_info *info,
1078                                               int index)
1079 {
1080         if (index >= info->maintenance_charge_size)
1081                 return NULL;
1082         return &info->maintenance_charge[index];
1083 }
1084 EXPORT_SYMBOL_GPL(power_supply_get_maintenance_charging_setting);
1085
1086 /**
1087  * power_supply_ocv2cap_simple() - find the battery capacity
1088  * @table: Pointer to battery OCV lookup table
1089  * @table_len: OCV table length
1090  * @ocv: Current OCV value
1091  *
1092  * This helper function is used to look up battery capacity according to
1093  * current OCV value from one OCV table, and the OCV table must be ordered
1094  * descending.
1095  *
1096  * Return: the battery capacity.
1097  */
1098 int power_supply_ocv2cap_simple(struct power_supply_battery_ocv_table *table,
1099                                 int table_len, int ocv)
1100 {
1101         int i, high, low;
1102
1103         for (i = 0; i < table_len; i++)
1104                 if (ocv > table[i].ocv)
1105                         break;
1106
1107         /* The library function will deal with high == low */
1108         if (i == 0)
1109                 high = low = i;
1110         else if (i == table_len)
1111                 high = low = i - 1;
1112         else
1113                 high = (low = i) - 1;
1114
1115         return fixp_linear_interpolate(table[low].ocv,
1116                                        table[low].capacity,
1117                                        table[high].ocv,
1118                                        table[high].capacity,
1119                                        ocv);
1120 }
1121 EXPORT_SYMBOL_GPL(power_supply_ocv2cap_simple);
1122
1123 struct power_supply_battery_ocv_table *
1124 power_supply_find_ocv2cap_table(struct power_supply_battery_info *info,
1125                                 int temp, int *table_len)
1126 {
1127         int best_temp_diff = INT_MAX, temp_diff;
1128         u8 i, best_index = 0;
1129
1130         if (!info->ocv_table[0])
1131                 return NULL;
1132
1133         for (i = 0; i < POWER_SUPPLY_OCV_TEMP_MAX; i++) {
1134                 /* Out of capacity tables */
1135                 if (!info->ocv_table[i])
1136                         break;
1137
1138                 temp_diff = abs(info->ocv_temp[i] - temp);
1139
1140                 if (temp_diff < best_temp_diff) {
1141                         best_temp_diff = temp_diff;
1142                         best_index = i;
1143                 }
1144         }
1145
1146         *table_len = info->ocv_table_size[best_index];
1147         return info->ocv_table[best_index];
1148 }
1149 EXPORT_SYMBOL_GPL(power_supply_find_ocv2cap_table);
1150
1151 int power_supply_batinfo_ocv2cap(struct power_supply_battery_info *info,
1152                                  int ocv, int temp)
1153 {
1154         struct power_supply_battery_ocv_table *table;
1155         int table_len;
1156
1157         table = power_supply_find_ocv2cap_table(info, temp, &table_len);
1158         if (!table)
1159                 return -EINVAL;
1160
1161         return power_supply_ocv2cap_simple(table, table_len, ocv);
1162 }
1163 EXPORT_SYMBOL_GPL(power_supply_batinfo_ocv2cap);
1164
1165 bool power_supply_battery_bti_in_range(struct power_supply_battery_info *info,
1166                                        int resistance)
1167 {
1168         int low, high;
1169
1170         /* Nothing like this can be checked */
1171         if (info->bti_resistance_ohm <= 0)
1172                 return false;
1173
1174         /* This will be extremely strict and unlikely to work */
1175         if (info->bti_resistance_tolerance <= 0)
1176                 return (info->bti_resistance_ohm == resistance);
1177
1178         low = info->bti_resistance_ohm -
1179                 (info->bti_resistance_ohm * info->bti_resistance_tolerance) / 100;
1180         high = info->bti_resistance_ohm +
1181                 (info->bti_resistance_ohm * info->bti_resistance_tolerance) / 100;
1182
1183         return ((resistance >= low) && (resistance <= high));
1184 }
1185 EXPORT_SYMBOL_GPL(power_supply_battery_bti_in_range);
1186
1187 static bool psy_has_property(const struct power_supply_desc *psy_desc,
1188                              enum power_supply_property psp)
1189 {
1190         bool found = false;
1191         int i;
1192
1193         for (i = 0; i < psy_desc->num_properties; i++) {
1194                 if (psy_desc->properties[i] == psp) {
1195                         found = true;
1196                         break;
1197                 }
1198         }
1199
1200         return found;
1201 }
1202
1203 int power_supply_get_property(struct power_supply *psy,
1204                             enum power_supply_property psp,
1205                             union power_supply_propval *val)
1206 {
1207         if (atomic_read(&psy->use_cnt) <= 0) {
1208                 if (!psy->initialized)
1209                         return -EAGAIN;
1210                 return -ENODEV;
1211         }
1212
1213         if (psy_has_property(psy->desc, psp))
1214                 return psy->desc->get_property(psy, psp, val);
1215         else if (power_supply_battery_info_has_prop(psy->battery_info, psp))
1216                 return power_supply_battery_info_get_prop(psy->battery_info, psp, val);
1217         else
1218                 return -EINVAL;
1219 }
1220 EXPORT_SYMBOL_GPL(power_supply_get_property);
1221
1222 int power_supply_set_property(struct power_supply *psy,
1223                             enum power_supply_property psp,
1224                             const union power_supply_propval *val)
1225 {
1226         if (atomic_read(&psy->use_cnt) <= 0 || !psy->desc->set_property)
1227                 return -ENODEV;
1228
1229         return psy->desc->set_property(psy, psp, val);
1230 }
1231 EXPORT_SYMBOL_GPL(power_supply_set_property);
1232
1233 int power_supply_property_is_writeable(struct power_supply *psy,
1234                                         enum power_supply_property psp)
1235 {
1236         if (atomic_read(&psy->use_cnt) <= 0 ||
1237                         !psy->desc->property_is_writeable)
1238                 return -ENODEV;
1239
1240         return psy->desc->property_is_writeable(psy, psp);
1241 }
1242 EXPORT_SYMBOL_GPL(power_supply_property_is_writeable);
1243
1244 void power_supply_external_power_changed(struct power_supply *psy)
1245 {
1246         if (atomic_read(&psy->use_cnt) <= 0 ||
1247                         !psy->desc->external_power_changed)
1248                 return;
1249
1250         psy->desc->external_power_changed(psy);
1251 }
1252 EXPORT_SYMBOL_GPL(power_supply_external_power_changed);
1253
1254 int power_supply_powers(struct power_supply *psy, struct device *dev)
1255 {
1256         return sysfs_create_link(&psy->dev.kobj, &dev->kobj, "powers");
1257 }
1258 EXPORT_SYMBOL_GPL(power_supply_powers);
1259
1260 static void power_supply_dev_release(struct device *dev)
1261 {
1262         struct power_supply *psy = to_power_supply(dev);
1263
1264         dev_dbg(dev, "%s\n", __func__);
1265         kfree(psy);
1266 }
1267
1268 int power_supply_reg_notifier(struct notifier_block *nb)
1269 {
1270         return blocking_notifier_chain_register(&power_supply_notifier, nb);
1271 }
1272 EXPORT_SYMBOL_GPL(power_supply_reg_notifier);
1273
1274 void power_supply_unreg_notifier(struct notifier_block *nb)
1275 {
1276         blocking_notifier_chain_unregister(&power_supply_notifier, nb);
1277 }
1278 EXPORT_SYMBOL_GPL(power_supply_unreg_notifier);
1279
1280 #ifdef CONFIG_THERMAL
1281 static int power_supply_read_temp(struct thermal_zone_device *tzd,
1282                 int *temp)
1283 {
1284         struct power_supply *psy;
1285         union power_supply_propval val;
1286         int ret;
1287
1288         WARN_ON(tzd == NULL);
1289         psy = thermal_zone_device_priv(tzd);
1290         ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_TEMP, &val);
1291         if (ret)
1292                 return ret;
1293
1294         /* Convert tenths of degree Celsius to milli degree Celsius. */
1295         *temp = val.intval * 100;
1296
1297         return ret;
1298 }
1299
1300 static struct thermal_zone_device_ops psy_tzd_ops = {
1301         .get_temp = power_supply_read_temp,
1302 };
1303
1304 static int psy_register_thermal(struct power_supply *psy)
1305 {
1306         int ret;
1307
1308         if (psy->desc->no_thermal)
1309                 return 0;
1310
1311         /* Register battery zone device psy reports temperature */
1312         if (psy_has_property(psy->desc, POWER_SUPPLY_PROP_TEMP)) {
1313                 /* Prefer our hwmon device and avoid duplicates */
1314                 struct thermal_zone_params tzp = {
1315                         .no_hwmon = IS_ENABLED(CONFIG_POWER_SUPPLY_HWMON)
1316                 };
1317                 psy->tzd = thermal_tripless_zone_device_register(psy->desc->name,
1318                                 psy, &psy_tzd_ops, &tzp);
1319                 if (IS_ERR(psy->tzd))
1320                         return PTR_ERR(psy->tzd);
1321                 ret = thermal_zone_device_enable(psy->tzd);
1322                 if (ret)
1323                         thermal_zone_device_unregister(psy->tzd);
1324                 return ret;
1325         }
1326
1327         return 0;
1328 }
1329
1330 static void psy_unregister_thermal(struct power_supply *psy)
1331 {
1332         if (IS_ERR_OR_NULL(psy->tzd))
1333                 return;
1334         thermal_zone_device_unregister(psy->tzd);
1335 }
1336
1337 #else
1338 static int psy_register_thermal(struct power_supply *psy)
1339 {
1340         return 0;
1341 }
1342
1343 static void psy_unregister_thermal(struct power_supply *psy)
1344 {
1345 }
1346 #endif
1347
1348 static struct power_supply *__must_check
1349 __power_supply_register(struct device *parent,
1350                                    const struct power_supply_desc *desc,
1351                                    const struct power_supply_config *cfg,
1352                                    bool ws)
1353 {
1354         struct device *dev;
1355         struct power_supply *psy;
1356         int rc;
1357
1358         if (!desc || !desc->name || !desc->properties || !desc->num_properties)
1359                 return ERR_PTR(-EINVAL);
1360
1361         if (!parent)
1362                 pr_warn("%s: Expected proper parent device for '%s'\n",
1363                         __func__, desc->name);
1364
1365         if (psy_has_property(desc, POWER_SUPPLY_PROP_USB_TYPE) &&
1366             (!desc->usb_types || !desc->num_usb_types))
1367                 return ERR_PTR(-EINVAL);
1368
1369         psy = kzalloc(sizeof(*psy), GFP_KERNEL);
1370         if (!psy)
1371                 return ERR_PTR(-ENOMEM);
1372
1373         dev = &psy->dev;
1374
1375         device_initialize(dev);
1376
1377         dev->class = &power_supply_class;
1378         dev->type = &power_supply_dev_type;
1379         dev->parent = parent;
1380         dev->release = power_supply_dev_release;
1381         dev_set_drvdata(dev, psy);
1382         psy->desc = desc;
1383         if (cfg) {
1384                 dev->groups = cfg->attr_grp;
1385                 psy->drv_data = cfg->drv_data;
1386                 psy->of_node =
1387                         cfg->fwnode ? to_of_node(cfg->fwnode) : cfg->of_node;
1388                 dev->of_node = psy->of_node;
1389                 psy->supplied_to = cfg->supplied_to;
1390                 psy->num_supplicants = cfg->num_supplicants;
1391         }
1392
1393         rc = dev_set_name(dev, "%s", desc->name);
1394         if (rc)
1395                 goto dev_set_name_failed;
1396
1397         INIT_WORK(&psy->changed_work, power_supply_changed_work);
1398         INIT_DELAYED_WORK(&psy->deferred_register_work,
1399                           power_supply_deferred_register_work);
1400
1401         rc = power_supply_check_supplies(psy);
1402         if (rc) {
1403                 dev_dbg(dev, "Not all required supplies found, defer probe\n");
1404                 goto check_supplies_failed;
1405         }
1406
1407         /*
1408          * Expose constant battery info, if it is available. While there are
1409          * some chargers accessing constant battery data, we only want to
1410          * expose battery data to userspace for battery devices.
1411          */
1412         if (desc->type == POWER_SUPPLY_TYPE_BATTERY) {
1413                 rc = power_supply_get_battery_info(psy, &psy->battery_info);
1414                 if (rc && rc != -ENODEV && rc != -ENOENT)
1415                         goto check_supplies_failed;
1416         }
1417
1418         spin_lock_init(&psy->changed_lock);
1419         rc = device_add(dev);
1420         if (rc)
1421                 goto device_add_failed;
1422
1423         rc = device_init_wakeup(dev, ws);
1424         if (rc)
1425                 goto wakeup_init_failed;
1426
1427         rc = psy_register_thermal(psy);
1428         if (rc)
1429                 goto register_thermal_failed;
1430
1431         rc = power_supply_create_triggers(psy);
1432         if (rc)
1433                 goto create_triggers_failed;
1434
1435         rc = power_supply_add_hwmon_sysfs(psy);
1436         if (rc)
1437                 goto add_hwmon_sysfs_failed;
1438
1439         /*
1440          * Update use_cnt after any uevents (most notably from device_add()).
1441          * We are here still during driver's probe but
1442          * the power_supply_uevent() calls back driver's get_property
1443          * method so:
1444          * 1. Driver did not assigned the returned struct power_supply,
1445          * 2. Driver could not finish initialization (anything in its probe
1446          *    after calling power_supply_register()).
1447          */
1448         atomic_inc(&psy->use_cnt);
1449         psy->initialized = true;
1450
1451         queue_delayed_work(system_power_efficient_wq,
1452                            &psy->deferred_register_work,
1453                            POWER_SUPPLY_DEFERRED_REGISTER_TIME);
1454
1455         return psy;
1456
1457 add_hwmon_sysfs_failed:
1458         power_supply_remove_triggers(psy);
1459 create_triggers_failed:
1460         psy_unregister_thermal(psy);
1461 register_thermal_failed:
1462 wakeup_init_failed:
1463         device_del(dev);
1464 device_add_failed:
1465 check_supplies_failed:
1466 dev_set_name_failed:
1467         put_device(dev);
1468         return ERR_PTR(rc);
1469 }
1470
1471 /**
1472  * power_supply_register() - Register new power supply
1473  * @parent:     Device to be a parent of power supply's device, usually
1474  *              the device which probe function calls this
1475  * @desc:       Description of power supply, must be valid through whole
1476  *              lifetime of this power supply
1477  * @cfg:        Run-time specific configuration accessed during registering,
1478  *              may be NULL
1479  *
1480  * Return: A pointer to newly allocated power_supply on success
1481  * or ERR_PTR otherwise.
1482  * Use power_supply_unregister() on returned power_supply pointer to release
1483  * resources.
1484  */
1485 struct power_supply *__must_check power_supply_register(struct device *parent,
1486                 const struct power_supply_desc *desc,
1487                 const struct power_supply_config *cfg)
1488 {
1489         return __power_supply_register(parent, desc, cfg, true);
1490 }
1491 EXPORT_SYMBOL_GPL(power_supply_register);
1492
1493 /**
1494  * power_supply_register_no_ws() - Register new non-waking-source power supply
1495  * @parent:     Device to be a parent of power supply's device, usually
1496  *              the device which probe function calls this
1497  * @desc:       Description of power supply, must be valid through whole
1498  *              lifetime of this power supply
1499  * @cfg:        Run-time specific configuration accessed during registering,
1500  *              may be NULL
1501  *
1502  * Return: A pointer to newly allocated power_supply on success
1503  * or ERR_PTR otherwise.
1504  * Use power_supply_unregister() on returned power_supply pointer to release
1505  * resources.
1506  */
1507 struct power_supply *__must_check
1508 power_supply_register_no_ws(struct device *parent,
1509                 const struct power_supply_desc *desc,
1510                 const struct power_supply_config *cfg)
1511 {
1512         return __power_supply_register(parent, desc, cfg, false);
1513 }
1514 EXPORT_SYMBOL_GPL(power_supply_register_no_ws);
1515
1516 static void devm_power_supply_release(struct device *dev, void *res)
1517 {
1518         struct power_supply **psy = res;
1519
1520         power_supply_unregister(*psy);
1521 }
1522
1523 /**
1524  * devm_power_supply_register() - Register managed power supply
1525  * @parent:     Device to be a parent of power supply's device, usually
1526  *              the device which probe function calls this
1527  * @desc:       Description of power supply, must be valid through whole
1528  *              lifetime of this power supply
1529  * @cfg:        Run-time specific configuration accessed during registering,
1530  *              may be NULL
1531  *
1532  * Return: A pointer to newly allocated power_supply on success
1533  * or ERR_PTR otherwise.
1534  * The returned power_supply pointer will be automatically unregistered
1535  * on driver detach.
1536  */
1537 struct power_supply *__must_check
1538 devm_power_supply_register(struct device *parent,
1539                 const struct power_supply_desc *desc,
1540                 const struct power_supply_config *cfg)
1541 {
1542         struct power_supply **ptr, *psy;
1543
1544         ptr = devres_alloc(devm_power_supply_release, sizeof(*ptr), GFP_KERNEL);
1545
1546         if (!ptr)
1547                 return ERR_PTR(-ENOMEM);
1548         psy = __power_supply_register(parent, desc, cfg, true);
1549         if (IS_ERR(psy)) {
1550                 devres_free(ptr);
1551         } else {
1552                 *ptr = psy;
1553                 devres_add(parent, ptr);
1554         }
1555         return psy;
1556 }
1557 EXPORT_SYMBOL_GPL(devm_power_supply_register);
1558
1559 /**
1560  * devm_power_supply_register_no_ws() - Register managed non-waking-source power supply
1561  * @parent:     Device to be a parent of power supply's device, usually
1562  *              the device which probe function calls this
1563  * @desc:       Description of power supply, must be valid through whole
1564  *              lifetime of this power supply
1565  * @cfg:        Run-time specific configuration accessed during registering,
1566  *              may be NULL
1567  *
1568  * Return: A pointer to newly allocated power_supply on success
1569  * or ERR_PTR otherwise.
1570  * The returned power_supply pointer will be automatically unregistered
1571  * on driver detach.
1572  */
1573 struct power_supply *__must_check
1574 devm_power_supply_register_no_ws(struct device *parent,
1575                 const struct power_supply_desc *desc,
1576                 const struct power_supply_config *cfg)
1577 {
1578         struct power_supply **ptr, *psy;
1579
1580         ptr = devres_alloc(devm_power_supply_release, sizeof(*ptr), GFP_KERNEL);
1581
1582         if (!ptr)
1583                 return ERR_PTR(-ENOMEM);
1584         psy = __power_supply_register(parent, desc, cfg, false);
1585         if (IS_ERR(psy)) {
1586                 devres_free(ptr);
1587         } else {
1588                 *ptr = psy;
1589                 devres_add(parent, ptr);
1590         }
1591         return psy;
1592 }
1593 EXPORT_SYMBOL_GPL(devm_power_supply_register_no_ws);
1594
1595 /**
1596  * power_supply_unregister() - Remove this power supply from system
1597  * @psy:        Pointer to power supply to unregister
1598  *
1599  * Remove this power supply from the system. The resources of power supply
1600  * will be freed here or on last power_supply_put() call.
1601  */
1602 void power_supply_unregister(struct power_supply *psy)
1603 {
1604         WARN_ON(atomic_dec_return(&psy->use_cnt));
1605         psy->removing = true;
1606         cancel_work_sync(&psy->changed_work);
1607         cancel_delayed_work_sync(&psy->deferred_register_work);
1608         sysfs_remove_link(&psy->dev.kobj, "powers");
1609         power_supply_remove_hwmon_sysfs(psy);
1610         power_supply_remove_triggers(psy);
1611         psy_unregister_thermal(psy);
1612         device_init_wakeup(&psy->dev, false);
1613         device_unregister(&psy->dev);
1614 }
1615 EXPORT_SYMBOL_GPL(power_supply_unregister);
1616
1617 void *power_supply_get_drvdata(struct power_supply *psy)
1618 {
1619         return psy->drv_data;
1620 }
1621 EXPORT_SYMBOL_GPL(power_supply_get_drvdata);
1622
1623 static int __init power_supply_class_init(void)
1624 {
1625         int err;
1626
1627         err = class_register(&power_supply_class);
1628         if (err)
1629                 return err;
1630
1631         power_supply_init_attrs();
1632
1633         return 0;
1634 }
1635
1636 static void __exit power_supply_class_exit(void)
1637 {
1638         class_unregister(&power_supply_class);
1639 }
1640
1641 subsys_initcall(power_supply_class_init);
1642 module_exit(power_supply_class_exit);
1643
1644 MODULE_DESCRIPTION("Universal power supply monitor class");
1645 MODULE_AUTHOR("Ian Molton <spyro@f2s.com>");
1646 MODULE_AUTHOR("Szabolcs Gyurko");
1647 MODULE_AUTHOR("Anton Vorontsov <cbou@mail.ru>");