drivers/power/supply/power_supply_core.c

   1 /*
   2  *  Universal power supply monitor class
   3  *
   4  *  Copyright © 2007  Anton Vorontsov <cbou@mail.ru>
   5  *  Copyright © 2004  Szabolcs Gyurko
   6  *  Copyright © 2003  Ian Molton <spyro@f2s.com>
   7  *
   8  *  Modified: 2004, Oct     Szabolcs Gyurko
   9  *
  10  *  You may use this code as per GPL version 2
  11  */
  12
  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 "power_supply.h"
  26
  27 /* exported for the APM Power driver, APM emulation */
  28 struct class *power_supply_class;
  29 EXPORT_SYMBOL_GPL(power_supply_class);
  30
  31 ATOMIC_NOTIFIER_HEAD(power_supply_notifier);
  32 EXPORT_SYMBOL_GPL(power_supply_notifier);
  33
  34 static struct device_type power_supply_dev_type;
  35
  36 #define POWER_SUPPLY_DEFERRED_REGISTER_TIME     msecs_to_jiffies(10)
  37
  38 static bool __power_supply_is_supplied_by(struct power_supply *supplier,
  39                                          struct power_supply *supply)
  40 {
  41         int i;
  42
  43         if (!supply->supplied_from && !supplier->supplied_to)
  44                 return false;
  45
  46         /* Support both supplied_to and supplied_from modes */
  47         if (supply->supplied_from) {
  48                 if (!supplier->desc->name)
  49                         return false;
  50                 for (i = 0; i < supply->num_supplies; i++)
  51                         if (!strcmp(supplier->desc->name, supply->supplied_from[i]))
  52                                 return true;
  53         } else {
  54                 if (!supply->desc->name)
  55                         return false;
  56                 for (i = 0; i < supplier->num_supplicants; i++)
  57                         if (!strcmp(supplier->supplied_to[i], supply->desc->name))
  58                                 return true;
  59         }
  60
  61         return false;
  62 }
  63
  64 static int __power_supply_changed_work(struct device *dev, void *data)
  65 {
  66         struct power_supply *psy = data;
  67         struct power_supply *pst = dev_get_drvdata(dev);
  68
  69         if (__power_supply_is_supplied_by(psy, pst)) {
  70                 if (pst->desc->external_power_changed)
  71                         pst->desc->external_power_changed(pst);
  72         }
  73
  74         return 0;
  75 }
  76
  77 static void power_supply_changed_work(struct work_struct *work)
  78 {
  79         unsigned long flags;
  80         struct power_supply *psy = container_of(work, struct power_supply,
  81                                                 changed_work);
  82
  83         dev_dbg(&psy->dev, "%s\n", __func__);
  84
  85         spin_lock_irqsave(&psy->changed_lock, flags);
  86         /*
  87          * Check 'changed' here to avoid issues due to race between
  88          * power_supply_changed() and this routine. In worst case
  89          * power_supply_changed() can be called again just before we take above
  90          * lock. During the first call of this routine we will mark 'changed' as
  91          * false and it will stay false for the next call as well.
  92          */
  93         if (likely(psy->changed)) {
  94                 psy->changed = false;
  95                 spin_unlock_irqrestore(&psy->changed_lock, flags);
  96                 class_for_each_device(power_supply_class, NULL, psy,
  97                                       __power_supply_changed_work);
  98                 power_supply_update_leds(psy);
  99                 atomic_notifier_call_chain(&power_supply_notifier,
 100                                 PSY_EVENT_PROP_CHANGED, psy);
 101                 kobject_uevent(&psy->dev.kobj, KOBJ_CHANGE);
 102                 spin_lock_irqsave(&psy->changed_lock, flags);
 103         }
 104
 105         /*
 106          * Hold the wakeup_source until all events are processed.
 107          * power_supply_changed() might have called again and have set 'changed'
 108          * to true.
 109          */
 110         if (likely(!psy->changed))
 111                 pm_relax(&psy->dev);
 112         spin_unlock_irqrestore(&psy->changed_lock, flags);
 113 }
 114
 115 void power_supply_changed(struct power_supply *psy)
 116 {
 117         unsigned long flags;
 118
 119         dev_dbg(&psy->dev, "%s\n", __func__);
 120
 121         spin_lock_irqsave(&psy->changed_lock, flags);
 122         psy->changed = true;
 123         pm_stay_awake(&psy->dev);
 124         spin_unlock_irqrestore(&psy->changed_lock, flags);
 125         schedule_work(&psy->changed_work);
 126 }
 127 EXPORT_SYMBOL_GPL(power_supply_changed);
 128
 129 /*
 130  * Notify that power supply was registered after parent finished the probing.
 131  *
 132  * Often power supply is registered from driver's probe function. However
 133  * calling power_supply_changed() directly from power_supply_register()
 134  * would lead to execution of get_property() function provided by the driver
 135  * too early - before the probe ends.
 136  *
 137  * Avoid that by waiting on parent's mutex.
 138  */
 139 static void power_supply_deferred_register_work(struct work_struct *work)
 140 {
 141         struct power_supply *psy = container_of(work, struct power_supply,
 142                                                 deferred_register_work.work);
 143
 144         if (psy->dev.parent) {
 145                 while (!mutex_trylock(&psy->dev.parent->mutex)) {
 146                         if (psy->removing)
 147                                 return;
 148                         msleep(10);
 149                 }
 150         }
 151
 152         power_supply_changed(psy);
 153
 154         if (psy->dev.parent)
 155                 mutex_unlock(&psy->dev.parent->mutex);
 156 }
 157
 158 #ifdef CONFIG_OF
 159 #include <linux/of.h>
 160
 161 static int __power_supply_populate_supplied_from(struct device *dev,
 162                                                  void *data)
 163 {
 164         struct power_supply *psy = data;
 165         struct power_supply *epsy = dev_get_drvdata(dev);
 166         struct device_node *np;
 167         int i = 0;
 168
 169         do {
 170                 np = of_parse_phandle(psy->of_node, "power-supplies", i++);
 171                 if (!np)
 172                         break;
 173
 174                 if (np == epsy->of_node) {
 175                         dev_info(&psy->dev, "%s: Found supply : %s\n",
 176                                 psy->desc->name, epsy->desc->name);
 177                         psy->supplied_from[i-1] = (char *)epsy->desc->name;
 178                         psy->num_supplies++;
 179                         of_node_put(np);
 180                         break;
 181                 }
 182                 of_node_put(np);
 183         } while (np);
 184
 185         return 0;
 186 }
 187
 188 static int power_supply_populate_supplied_from(struct power_supply *psy)
 189 {
 190         int error;
 191
 192         error = class_for_each_device(power_supply_class, NULL, psy,
 193                                       __power_supply_populate_supplied_from);
 194
 195         dev_dbg(&psy->dev, "%s %d\n", __func__, error);
 196
 197         return error;
 198 }
 199
 200 static int  __power_supply_find_supply_from_node(struct device *dev,
 201                                                  void *data)
 202 {
 203         struct device_node *np = data;
 204         struct power_supply *epsy = dev_get_drvdata(dev);
 205
 206         /* returning non-zero breaks out of class_for_each_device loop */
 207         if (epsy->of_node == np)
 208                 return 1;
 209
 210         return 0;
 211 }
 212
 213 static int power_supply_find_supply_from_node(struct device_node *supply_node)
 214 {
 215         int error;
 216
 217         /*
 218          * class_for_each_device() either returns its own errors or values
 219          * returned by __power_supply_find_supply_from_node().
 220          *
 221          * __power_supply_find_supply_from_node() will return 0 (no match)
 222          * or 1 (match).
 223          *
 224          * We return 0 if class_for_each_device() returned 1, -EPROBE_DEFER if
 225          * it returned 0, or error as returned by it.
 226          */
 227         error = class_for_each_device(power_supply_class, NULL, supply_node,
 228                                        __power_supply_find_supply_from_node);
 229
 230         return error ? (error == 1 ? 0 : error) : -EPROBE_DEFER;
 231 }
 232
 233 static int power_supply_check_supplies(struct power_supply *psy)
 234 {
 235         struct device_node *np;
 236         int cnt = 0;
 237
 238         /* If there is already a list honor it */
 239         if (psy->supplied_from && psy->num_supplies > 0)
 240                 return 0;
 241
 242         /* No device node found, nothing to do */
 243         if (!psy->of_node)
 244                 return 0;
 245
 246         do {
 247                 int ret;
 248
 249                 np = of_parse_phandle(psy->of_node, "power-supplies", cnt++);
 250                 if (!np)
 251                         break;
 252
 253                 ret = power_supply_find_supply_from_node(np);
 254                 of_node_put(np);
 255
 256                 if (ret) {
 257                         dev_dbg(&psy->dev, "Failed to find supply!\n");
 258                         return ret;
 259                 }
 260         } while (np);
 261
 262         /* Missing valid "power-supplies" entries */
 263         if (cnt == 1)
 264                 return 0;
 265
 266         /* All supplies found, allocate char ** array for filling */
 267         psy->supplied_from = devm_kzalloc(&psy->dev, sizeof(psy->supplied_from),
 268                                           GFP_KERNEL);
 269         if (!psy->supplied_from)
 270                 return -ENOMEM;
 271
 272         *psy->supplied_from = devm_kcalloc(&psy->dev,
 273                                            cnt - 1, sizeof(char *),
 274                                            GFP_KERNEL);
 275         if (!*psy->supplied_from)
 276                 return -ENOMEM;
 277
 278         return power_supply_populate_supplied_from(psy);
 279 }
 280 #else
 281 static int power_supply_check_supplies(struct power_supply *psy)
 282 {
 283         int nval, ret;
 284
 285         if (!psy->dev.parent)
 286                 return 0;
 287
 288         nval = device_property_read_string_array(psy->dev.parent,
 289                                                  "supplied-from", NULL, 0);
 290         if (nval <= 0)
 291                 return 0;
 292
 293         psy->supplied_from = devm_kmalloc_array(&psy->dev, nval,
 294                                                 sizeof(char *), GFP_KERNEL);
 295         if (!psy->supplied_from)
 296                 return -ENOMEM;
 297
 298         ret = device_property_read_string_array(psy->dev.parent,
 299                 "supplied-from", (const char **)psy->supplied_from, nval);
 300         if (ret < 0)
 301                 return ret;
 302
 303         psy->num_supplies = nval;
 304
 305         return 0;
 306 }
 307 #endif
 308
 309 struct psy_am_i_supplied_data {
 310         struct power_supply *psy;
 311         unsigned int count;
 312 };
 313
 314 static int __power_supply_am_i_supplied(struct device *dev, void *_data)
 315 {
 316         union power_supply_propval ret = {0,};
 317         struct power_supply *epsy = dev_get_drvdata(dev);
 318         struct psy_am_i_supplied_data *data = _data;
 319
 320         if (__power_supply_is_supplied_by(epsy, data->psy)) {
 321                 data->count++;
 322                 if (!epsy->desc->get_property(epsy, POWER_SUPPLY_PROP_ONLINE,
 323                                         &ret))
 324                         return ret.intval;
 325         }
 326
 327         return 0;
 328 }
 329
 330 int power_supply_am_i_supplied(struct power_supply *psy)
 331 {
 332         struct psy_am_i_supplied_data data = { psy, 0 };
 333         int error;
 334
 335         error = class_for_each_device(power_supply_class, NULL, &data,
 336                                       __power_supply_am_i_supplied);
 337
 338         dev_dbg(&psy->dev, "%s count %u err %d\n", __func__, data.count, error);
 339
 340         if (data.count == 0)
 341                 return -ENODEV;
 342
 343         return error;
 344 }
 345 EXPORT_SYMBOL_GPL(power_supply_am_i_supplied);
 346
 347 static int __power_supply_is_system_supplied(struct device *dev, void *data)
 348 {
 349         union power_supply_propval ret = {0,};
 350         struct power_supply *psy = dev_get_drvdata(dev);
 351         unsigned int *count = data;
 352
 353         if (!psy->desc->get_property(psy, POWER_SUPPLY_PROP_SCOPE, &ret))
 354                 if (ret.intval == POWER_SUPPLY_SCOPE_DEVICE)
 355                         return 0;
 356
 357         (*count)++;
 358         if (psy->desc->type != POWER_SUPPLY_TYPE_BATTERY)
 359                 if (!psy->desc->get_property(psy, POWER_SUPPLY_PROP_ONLINE,
 360                                         &ret))
 361                         return ret.intval;
 362
 363         return 0;
 364 }
 365
 366 int power_supply_is_system_supplied(void)
 367 {
 368         int error;
 369         unsigned int count = 0;
 370
 371         error = class_for_each_device(power_supply_class, NULL, &count,
 372                                       __power_supply_is_system_supplied);
 373
 374         /*
 375          * If no system scope power class device was found at all, most probably we
 376          * are running on a desktop system, so assume we are on mains power.
 377          */
 378         if (count == 0)
 379                 return 1;
 380
 381         return error;
 382 }
 383 EXPORT_SYMBOL_GPL(power_supply_is_system_supplied);
 384
 385 struct psy_get_supplier_prop_data {
 386         struct power_supply *psy;
 387         enum power_supply_property psp;
 388         union power_supply_propval *val;
 389 };
 390
 391 static int __power_supply_get_supplier_property(struct device *dev, void *_data)
 392 {
 393         struct power_supply *epsy = dev_get_drvdata(dev);
 394         struct psy_get_supplier_prop_data *data = _data;
 395
 396         if (__power_supply_is_supplied_by(epsy, data->psy))
 397                 if (!epsy->desc->get_property(epsy, data->psp, data->val))
 398                         return 1; /* Success */
 399
 400         return 0; /* Continue iterating */
 401 }
 402
 403 int power_supply_get_property_from_supplier(struct power_supply *psy,
 404                                             enum power_supply_property psp,
 405                                             union power_supply_propval *val)
 406 {
 407         struct psy_get_supplier_prop_data data = {
 408                 .psy = psy,
 409                 .psp = psp,
 410                 .val = val,
 411         };
 412         int ret;
 413
 414         /*
 415          * This function is not intended for use with a supply with multiple
 416          * suppliers, we simply pick the first supply to report the psp.
 417          */
 418         ret = class_for_each_device(power_supply_class, NULL, &data,
 419                                     __power_supply_get_supplier_property);
 420         if (ret < 0)
 421                 return ret;
 422         if (ret == 0)
 423                 return -ENODEV;
 424
 425         return 0;
 426 }
 427 EXPORT_SYMBOL_GPL(power_supply_get_property_from_supplier);
 428
 429 int power_supply_set_battery_charged(struct power_supply *psy)
 430 {
 431         if (atomic_read(&psy->use_cnt) >= 0 &&
 432                         psy->desc->type == POWER_SUPPLY_TYPE_BATTERY &&
 433                         psy->desc->set_charged) {
 434                 psy->desc->set_charged(psy);
 435                 return 0;
 436         }
 437
 438         return -EINVAL;
 439 }
 440 EXPORT_SYMBOL_GPL(power_supply_set_battery_charged);
 441
 442 static int power_supply_match_device_by_name(struct device *dev, const void *data)
 443 {
 444         const char *name = data;
 445         struct power_supply *psy = dev_get_drvdata(dev);
 446
 447         return strcmp(psy->desc->name, name) == 0;
 448 }
 449
 450 /**
 451  * power_supply_get_by_name() - Search for a power supply and returns its ref
 452  * @name: Power supply name to fetch
 453  *
 454  * If power supply was found, it increases reference count for the
 455  * internal power supply's device. The user should power_supply_put()
 456  * after usage.
 457  *
 458  * Return: On success returns a reference to a power supply with
 459  * matching name equals to @name, a NULL otherwise.
 460  */
 461 struct power_supply *power_supply_get_by_name(const char *name)
 462 {
 463         struct power_supply *psy = NULL;
 464         struct device *dev = class_find_device(power_supply_class, NULL, name,
 465                                         power_supply_match_device_by_name);
 466
 467         if (dev) {
 468                 psy = dev_get_drvdata(dev);
 469                 atomic_inc(&psy->use_cnt);
 470         }
 471
 472         return psy;
 473 }
 474 EXPORT_SYMBOL_GPL(power_supply_get_by_name);
 475
 476 /**
 477  * power_supply_put() - Drop reference obtained with power_supply_get_by_name
 478  * @psy: Reference to put
 479  *
 480  * The reference to power supply should be put before unregistering
 481  * the power supply.
 482  */
 483 void power_supply_put(struct power_supply *psy)
 484 {
 485         might_sleep();
 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)
 577 {
 578         struct device_node *battery_np;
 579         const char *value;
 580         int err;
 581
 582         info->energy_full_design_uwh         = -EINVAL;
 583         info->charge_full_design_uah         = -EINVAL;
 584         info->voltage_min_design_uv          = -EINVAL;
 585         info->precharge_current_ua           = -EINVAL;
 586         info->charge_term_current_ua         = -EINVAL;
 587         info->constant_charge_current_max_ua = -EINVAL;
 588         info->constant_charge_voltage_max_uv = -EINVAL;
 589
 590         if (!psy->of_node) {
 591                 dev_warn(&psy->dev, "%s currently only supports devicetree\n",
 592                          __func__);
 593                 return -ENXIO;
 594         }
 595
 596         battery_np = of_parse_phandle(psy->of_node, "monitored-battery", 0);
 597         if (!battery_np)
 598                 return -ENODEV;
 599
 600         err = of_property_read_string(battery_np, "compatible", &value);
 601         if (err)
 602                 return err;
 603
 604         if (strcmp("simple-battery", value))
 605                 return -ENODEV;
 606
 607         /* The property and field names below must correspond to elements
 608          * in enum power_supply_property. For reasoning, see
 609          * Documentation/power/power_supply_class.txt.
 610          */
 611
 612         of_property_read_u32(battery_np, "energy-full-design-microwatt-hours",
 613                              &info->energy_full_design_uwh);
 614         of_property_read_u32(battery_np, "charge-full-design-microamp-hours",
 615                              &info->charge_full_design_uah);
 616         of_property_read_u32(battery_np, "voltage-min-design-microvolt",
 617                              &info->voltage_min_design_uv);
 618         of_property_read_u32(battery_np, "precharge-current-microamp",
 619                              &info->precharge_current_ua);
 620         of_property_read_u32(battery_np, "charge-term-current-microamp",
 621                              &info->charge_term_current_ua);
 622         of_property_read_u32(battery_np, "constant_charge_current_max_microamp",
 623                              &info->constant_charge_current_max_ua);
 624         of_property_read_u32(battery_np, "constant_charge_voltage_max_microvolt",
 625                              &info->constant_charge_voltage_max_uv);
 626
 627         return 0;
 628 }
 629 EXPORT_SYMBOL_GPL(power_supply_get_battery_info);
 630
 631 int power_supply_get_property(struct power_supply *psy,
 632                             enum power_supply_property psp,
 633                             union power_supply_propval *val)
 634 {
 635         if (atomic_read(&psy->use_cnt) <= 0) {
 636                 if (!psy->initialized)
 637                         return -EAGAIN;
 638                 return -ENODEV;
 639         }
 640
 641         return psy->desc->get_property(psy, psp, val);
 642 }
 643 EXPORT_SYMBOL_GPL(power_supply_get_property);
 644
 645 int power_supply_set_property(struct power_supply *psy,
 646                             enum power_supply_property psp,
 647                             const union power_supply_propval *val)
 648 {
 649         if (atomic_read(&psy->use_cnt) <= 0 || !psy->desc->set_property)
 650                 return -ENODEV;
 651
 652         return psy->desc->set_property(psy, psp, val);
 653 }
 654 EXPORT_SYMBOL_GPL(power_supply_set_property);
 655
 656 int power_supply_property_is_writeable(struct power_supply *psy,
 657                                         enum power_supply_property psp)
 658 {
 659         if (atomic_read(&psy->use_cnt) <= 0 ||
 660                         !psy->desc->property_is_writeable)
 661                 return -ENODEV;
 662
 663         return psy->desc->property_is_writeable(psy, psp);
 664 }
 665 EXPORT_SYMBOL_GPL(power_supply_property_is_writeable);
 666
 667 void power_supply_external_power_changed(struct power_supply *psy)
 668 {
 669         if (atomic_read(&psy->use_cnt) <= 0 ||
 670                         !psy->desc->external_power_changed)
 671                 return;
 672
 673         psy->desc->external_power_changed(psy);
 674 }
 675 EXPORT_SYMBOL_GPL(power_supply_external_power_changed);
 676
 677 int power_supply_powers(struct power_supply *psy, struct device *dev)
 678 {
 679         return sysfs_create_link(&psy->dev.kobj, &dev->kobj, "powers");
 680 }
 681 EXPORT_SYMBOL_GPL(power_supply_powers);
 682
 683 static void power_supply_dev_release(struct device *dev)
 684 {
 685         struct power_supply *psy = to_power_supply(dev);
 686         dev_dbg(dev, "%s\n", __func__);
 687         kfree(psy);
 688 }
 689
 690 int power_supply_reg_notifier(struct notifier_block *nb)
 691 {
 692         return atomic_notifier_chain_register(&power_supply_notifier, nb);
 693 }
 694 EXPORT_SYMBOL_GPL(power_supply_reg_notifier);
 695
 696 void power_supply_unreg_notifier(struct notifier_block *nb)
 697 {
 698         atomic_notifier_chain_unregister(&power_supply_notifier, nb);
 699 }
 700 EXPORT_SYMBOL_GPL(power_supply_unreg_notifier);
 701
 702 #ifdef CONFIG_THERMAL
 703 static int power_supply_read_temp(struct thermal_zone_device *tzd,
 704                 int *temp)
 705 {
 706         struct power_supply *psy;
 707         union power_supply_propval val;
 708         int ret;
 709
 710         WARN_ON(tzd == NULL);
 711         psy = tzd->devdata;
 712         ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_TEMP, &val);
 713         if (ret)
 714                 return ret;
 715
 716         /* Convert tenths of degree Celsius to milli degree Celsius. */
 717         *temp = val.intval * 100;
 718
 719         return ret;
 720 }
 721
 722 static struct thermal_zone_device_ops psy_tzd_ops = {
 723         .get_temp = power_supply_read_temp,
 724 };
 725
 726 static int psy_register_thermal(struct power_supply *psy)
 727 {
 728         int i;
 729
 730         if (psy->desc->no_thermal)
 731                 return 0;
 732
 733         /* Register battery zone device psy reports temperature */
 734         for (i = 0; i < psy->desc->num_properties; i++) {
 735                 if (psy->desc->properties[i] == POWER_SUPPLY_PROP_TEMP) {
 736                         psy->tzd = thermal_zone_device_register(psy->desc->name,
 737                                         0, 0, psy, &psy_tzd_ops, NULL, 0, 0);
 738                         return PTR_ERR_OR_ZERO(psy->tzd);
 739                 }
 740         }
 741         return 0;
 742 }
 743
 744 static void psy_unregister_thermal(struct power_supply *psy)
 745 {
 746         if (IS_ERR_OR_NULL(psy->tzd))
 747                 return;
 748         thermal_zone_device_unregister(psy->tzd);
 749 }
 750
 751 /* thermal cooling device callbacks */
 752 static int ps_get_max_charge_cntl_limit(struct thermal_cooling_device *tcd,
 753                                         unsigned long *state)
 754 {
 755         struct power_supply *psy;
 756         union power_supply_propval val;
 757         int ret;
 758
 759         psy = tcd->devdata;
 760         ret = power_supply_get_property(psy,
 761                         POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT_MAX, &val);
 762         if (ret)
 763                 return ret;
 764
 765         *state = val.intval;
 766
 767         return ret;
 768 }
 769
 770 static int ps_get_cur_chrage_cntl_limit(struct thermal_cooling_device *tcd,
 771                                         unsigned long *state)
 772 {
 773         struct power_supply *psy;
 774         union power_supply_propval val;
 775         int ret;
 776
 777         psy = tcd->devdata;
 778         ret = power_supply_get_property(psy,
 779                         POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT, &val);
 780         if (ret)
 781                 return ret;
 782
 783         *state = val.intval;
 784
 785         return ret;
 786 }
 787
 788 static int ps_set_cur_charge_cntl_limit(struct thermal_cooling_device *tcd,
 789                                         unsigned long state)
 790 {
 791         struct power_supply *psy;
 792         union power_supply_propval val;
 793         int ret;
 794
 795         psy = tcd->devdata;
 796         val.intval = state;
 797         ret = psy->desc->set_property(psy,
 798                 POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT, &val);
 799
 800         return ret;
 801 }
 802
 803 static const struct thermal_cooling_device_ops psy_tcd_ops = {
 804         .get_max_state = ps_get_max_charge_cntl_limit,
 805         .get_cur_state = ps_get_cur_chrage_cntl_limit,
 806         .set_cur_state = ps_set_cur_charge_cntl_limit,
 807 };
 808
 809 static int psy_register_cooler(struct power_supply *psy)
 810 {
 811         int i;
 812
 813         /* Register for cooling device if psy can control charging */
 814         for (i = 0; i < psy->desc->num_properties; i++) {
 815                 if (psy->desc->properties[i] ==
 816                                 POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT) {
 817                         psy->tcd = thermal_cooling_device_register(
 818                                                         (char *)psy->desc->name,
 819                                                         psy, &psy_tcd_ops);
 820                         return PTR_ERR_OR_ZERO(psy->tcd);
 821                 }
 822         }
 823         return 0;
 824 }
 825
 826 static void psy_unregister_cooler(struct power_supply *psy)
 827 {
 828         if (IS_ERR_OR_NULL(psy->tcd))
 829                 return;
 830         thermal_cooling_device_unregister(psy->tcd);
 831 }
 832 #else
 833 static int psy_register_thermal(struct power_supply *psy)
 834 {
 835         return 0;
 836 }
 837
 838 static void psy_unregister_thermal(struct power_supply *psy)
 839 {
 840 }
 841
 842 static int psy_register_cooler(struct power_supply *psy)
 843 {
 844         return 0;
 845 }
 846
 847 static void psy_unregister_cooler(struct power_supply *psy)
 848 {
 849 }
 850 #endif
 851
 852 static struct power_supply *__must_check
 853 __power_supply_register(struct device *parent,
 854                                    const struct power_supply_desc *desc,
 855                                    const struct power_supply_config *cfg,
 856                                    bool ws)
 857 {
 858         struct device *dev;
 859         struct power_supply *psy;
 860         int i, rc;
 861
 862         if (!parent)
 863                 pr_warn("%s: Expected proper parent device for '%s'\n",
 864                         __func__, desc->name);
 865
 866         if (!desc || !desc->name || !desc->properties || !desc->num_properties)
 867                 return ERR_PTR(-EINVAL);
 868
 869         for (i = 0; i < desc->num_properties; ++i) {
 870                 if ((desc->properties[i] == POWER_SUPPLY_PROP_USB_TYPE) &&
 871                     (!desc->usb_types || !desc->num_usb_types))
 872                         return ERR_PTR(-EINVAL);
 873         }
 874
 875         psy = kzalloc(sizeof(*psy), GFP_KERNEL);
 876         if (!psy)
 877                 return ERR_PTR(-ENOMEM);
 878
 879         dev = &psy->dev;
 880
 881         device_initialize(dev);
 882
 883         dev->class = power_supply_class;
 884         dev->type = &power_supply_dev_type;
 885         dev->parent = parent;
 886         dev->release = power_supply_dev_release;
 887         dev_set_drvdata(dev, psy);
 888         psy->desc = desc;
 889         if (cfg) {
 890                 psy->drv_data = cfg->drv_data;
 891                 psy->of_node =
 892                         cfg->fwnode ? to_of_node(cfg->fwnode) : cfg->of_node;
 893                 psy->supplied_to = cfg->supplied_to;
 894                 psy->num_supplicants = cfg->num_supplicants;
 895         }
 896
 897         rc = dev_set_name(dev, "%s", desc->name);
 898         if (rc)
 899                 goto dev_set_name_failed;
 900
 901         INIT_WORK(&psy->changed_work, power_supply_changed_work);
 902         INIT_DELAYED_WORK(&psy->deferred_register_work,
 903                           power_supply_deferred_register_work);
 904
 905         rc = power_supply_check_supplies(psy);
 906         if (rc) {
 907                 dev_info(dev, "Not all required supplies found, defer probe\n");
 908                 goto check_supplies_failed;
 909         }
 910
 911         spin_lock_init(&psy->changed_lock);
 912         rc = device_add(dev);
 913         if (rc)
 914                 goto device_add_failed;
 915
 916         rc = device_init_wakeup(dev, ws);
 917         if (rc)
 918                 goto wakeup_init_failed;
 919
 920         rc = psy_register_thermal(psy);
 921         if (rc)
 922                 goto register_thermal_failed;
 923
 924         rc = psy_register_cooler(psy);
 925         if (rc)
 926                 goto register_cooler_failed;
 927
 928         rc = power_supply_create_triggers(psy);
 929         if (rc)
 930                 goto create_triggers_failed;
 931
 932         /*
 933          * Update use_cnt after any uevents (most notably from device_add()).
 934          * We are here still during driver's probe but
 935          * the power_supply_uevent() calls back driver's get_property
 936          * method so:
 937          * 1. Driver did not assigned the returned struct power_supply,
 938          * 2. Driver could not finish initialization (anything in its probe
 939          *    after calling power_supply_register()).
 940          */
 941         atomic_inc(&psy->use_cnt);
 942         psy->initialized = true;
 943
 944         queue_delayed_work(system_power_efficient_wq,
 945                            &psy->deferred_register_work,
 946                            POWER_SUPPLY_DEFERRED_REGISTER_TIME);
 947
 948         return psy;
 949
 950 create_triggers_failed:
 951         psy_unregister_cooler(psy);
 952 register_cooler_failed:
 953         psy_unregister_thermal(psy);
 954 register_thermal_failed:
 955 wakeup_init_failed:
 956         device_del(dev);
 957 device_add_failed:
 958 check_supplies_failed:
 959 dev_set_name_failed:
 960         put_device(dev);
 961         return ERR_PTR(rc);
 962 }
 963
 964 /**
 965  * power_supply_register() - Register new power supply
 966  * @parent:     Device to be a parent of power supply's device, usually
 967  *              the device which probe function calls this
 968  * @desc:       Description of power supply, must be valid through whole
 969  *              lifetime of this power supply
 970  * @cfg:        Run-time specific configuration accessed during registering,
 971  *              may be NULL
 972  *
 973  * Return: A pointer to newly allocated power_supply on success
 974  * or ERR_PTR otherwise.
 975  * Use power_supply_unregister() on returned power_supply pointer to release
 976  * resources.
 977  */
 978 struct power_supply *__must_check power_supply_register(struct device *parent,
 979                 const struct power_supply_desc *desc,
 980                 const struct power_supply_config *cfg)
 981 {
 982         return __power_supply_register(parent, desc, cfg, true);
 983 }
 984 EXPORT_SYMBOL_GPL(power_supply_register);
 985
 986 /**
 987  * power_supply_register_no_ws() - Register new non-waking-source power supply
 988  * @parent:     Device to be a parent of power supply's device, usually
 989  *              the device which probe function calls this
 990  * @desc:       Description of power supply, must be valid through whole
 991  *              lifetime of this power supply
 992  * @cfg:        Run-time specific configuration accessed during registering,
 993  *              may be NULL
 994  *
 995  * Return: A pointer to newly allocated power_supply on success
 996  * or ERR_PTR otherwise.
 997  * Use power_supply_unregister() on returned power_supply pointer to release
 998  * resources.
 999  */
1000 struct power_supply *__must_check
1001 power_supply_register_no_ws(struct device *parent,
1002                 const struct power_supply_desc *desc,
1003                 const struct power_supply_config *cfg)
1004 {
1005         return __power_supply_register(parent, desc, cfg, false);
1006 }
1007 EXPORT_SYMBOL_GPL(power_supply_register_no_ws);
1008
1009 static void devm_power_supply_release(struct device *dev, void *res)
1010 {
1011         struct power_supply **psy = res;
1012
1013         power_supply_unregister(*psy);
1014 }
1015
1016 /**
1017  * devm_power_supply_register() - Register managed power supply
1018  * @parent:     Device to be a parent of power supply's device, usually
1019  *              the device which probe function calls this
1020  * @desc:       Description of power supply, must be valid through whole
1021  *              lifetime of this power supply
1022  * @cfg:        Run-time specific configuration accessed during registering,
1023  *              may be NULL
1024  *
1025  * Return: A pointer to newly allocated power_supply on success
1026  * or ERR_PTR otherwise.
1027  * The returned power_supply pointer will be automatically unregistered
1028  * on driver detach.
1029  */
1030 struct power_supply *__must_check
1031 devm_power_supply_register(struct device *parent,
1032                 const struct power_supply_desc *desc,
1033                 const struct power_supply_config *cfg)
1034 {
1035         struct power_supply **ptr, *psy;
1036
1037         ptr = devres_alloc(devm_power_supply_release, sizeof(*ptr), GFP_KERNEL);
1038
1039         if (!ptr)
1040                 return ERR_PTR(-ENOMEM);
1041         psy = __power_supply_register(parent, desc, cfg, true);
1042         if (IS_ERR(psy)) {
1043                 devres_free(ptr);
1044         } else {
1045                 *ptr = psy;
1046                 devres_add(parent, ptr);
1047         }
1048         return psy;
1049 }
1050 EXPORT_SYMBOL_GPL(devm_power_supply_register);
1051
1052 /**
1053  * devm_power_supply_register_no_ws() - Register managed non-waking-source power supply
1054  * @parent:     Device to be a parent of power supply's device, usually
1055  *              the device which probe function calls this
1056  * @desc:       Description of power supply, must be valid through whole
1057  *              lifetime of this power supply
1058  * @cfg:        Run-time specific configuration accessed during registering,
1059  *              may be NULL
1060  *
1061  * Return: A pointer to newly allocated power_supply on success
1062  * or ERR_PTR otherwise.
1063  * The returned power_supply pointer will be automatically unregistered
1064  * on driver detach.
1065  */
1066 struct power_supply *__must_check
1067 devm_power_supply_register_no_ws(struct device *parent,
1068                 const struct power_supply_desc *desc,
1069                 const struct power_supply_config *cfg)
1070 {
1071         struct power_supply **ptr, *psy;
1072
1073         ptr = devres_alloc(devm_power_supply_release, sizeof(*ptr), GFP_KERNEL);
1074
1075         if (!ptr)
1076                 return ERR_PTR(-ENOMEM);
1077         psy = __power_supply_register(parent, desc, cfg, false);
1078         if (IS_ERR(psy)) {
1079                 devres_free(ptr);
1080         } else {
1081                 *ptr = psy;
1082                 devres_add(parent, ptr);
1083         }
1084         return psy;
1085 }
1086 EXPORT_SYMBOL_GPL(devm_power_supply_register_no_ws);
1087
1088 /**
1089  * power_supply_unregister() - Remove this power supply from system
1090  * @psy:        Pointer to power supply to unregister
1091  *
1092  * Remove this power supply from the system. The resources of power supply
1093  * will be freed here or on last power_supply_put() call.
1094  */
1095 void power_supply_unregister(struct power_supply *psy)
1096 {
1097         WARN_ON(atomic_dec_return(&psy->use_cnt));
1098         psy->removing = true;
1099         cancel_work_sync(&psy->changed_work);
1100         cancel_delayed_work_sync(&psy->deferred_register_work);
1101         sysfs_remove_link(&psy->dev.kobj, "powers");
1102         power_supply_remove_triggers(psy);
1103         psy_unregister_cooler(psy);
1104         psy_unregister_thermal(psy);
1105         device_init_wakeup(&psy->dev, false);
1106         device_unregister(&psy->dev);
1107 }
1108 EXPORT_SYMBOL_GPL(power_supply_unregister);
1109
1110 void *power_supply_get_drvdata(struct power_supply *psy)
1111 {
1112         return psy->drv_data;
1113 }
1114 EXPORT_SYMBOL_GPL(power_supply_get_drvdata);
1115
1116 static int __init power_supply_class_init(void)
1117 {
1118         power_supply_class = class_create(THIS_MODULE, "power_supply");
1119
1120         if (IS_ERR(power_supply_class))
1121                 return PTR_ERR(power_supply_class);
1122
1123         power_supply_class->dev_uevent = power_supply_uevent;
1124         power_supply_init_attrs(&power_supply_dev_type);
1125
1126         return 0;
1127 }
1128
1129 static void __exit power_supply_class_exit(void)
1130 {
1131         class_destroy(power_supply_class);
1132 }
1133
1134 subsys_initcall(power_supply_class_init);
1135 module_exit(power_supply_class_exit);
1136
1137 MODULE_DESCRIPTION("Universal power supply monitor class");
1138 MODULE_AUTHOR("Ian Molton <spyro@f2s.com>, "
1139               "Szabolcs Gyurko, "
1140               "Anton Vorontsov <cbou@mail.ru>");
1141 MODULE_LICENSE("GPL");