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/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/thermal.h>
  23 #include "power_supply.h"
  24
  25 /* exported for the APM Power driver, APM emulation */
  26 struct class *power_supply_class;
  27 EXPORT_SYMBOL_GPL(power_supply_class);
  28
  29 ATOMIC_NOTIFIER_HEAD(power_supply_notifier);
  30 EXPORT_SYMBOL_GPL(power_supply_notifier);
  31
  32 static struct device_type power_supply_dev_type;
  33
  34 #define POWER_SUPPLY_DEFERRED_REGISTER_TIME     msecs_to_jiffies(10)
  35
  36 static bool __power_supply_is_supplied_by(struct power_supply *supplier,
  37                                          struct power_supply *supply)
  38 {
  39         int i;
  40
  41         if (!supply->supplied_from && !supplier->supplied_to)
  42                 return false;
  43
  44         /* Support both supplied_to and supplied_from modes */
  45         if (supply->supplied_from) {
  46                 if (!supplier->desc->name)
  47                         return false;
  48                 for (i = 0; i < supply->num_supplies; i++)
  49                         if (!strcmp(supplier->desc->name, supply->supplied_from[i]))
  50                                 return true;
  51         } else {
  52                 if (!supply->desc->name)
  53                         return false;
  54                 for (i = 0; i < supplier->num_supplicants; i++)
  55                         if (!strcmp(supplier->supplied_to[i], supply->desc->name))
  56                                 return true;
  57         }
  58
  59         return false;
  60 }
  61
  62 static int __power_supply_changed_work(struct device *dev, void *data)
  63 {
  64         struct power_supply *psy = data;
  65         struct power_supply *pst = dev_get_drvdata(dev);
  66
  67         if (__power_supply_is_supplied_by(psy, pst)) {
  68                 if (pst->desc->external_power_changed)
  69                         pst->desc->external_power_changed(pst);
  70         }
  71
  72         return 0;
  73 }
  74
  75 static void power_supply_changed_work(struct work_struct *work)
  76 {
  77         unsigned long flags;
  78         struct power_supply *psy = container_of(work, struct power_supply,
  79                                                 changed_work);
  80
  81         dev_dbg(&psy->dev, "%s\n", __func__);
  82
  83         spin_lock_irqsave(&psy->changed_lock, flags);
  84         /*
  85          * Check 'changed' here to avoid issues due to race between
  86          * power_supply_changed() and this routine. In worst case
  87          * power_supply_changed() can be called again just before we take above
  88          * lock. During the first call of this routine we will mark 'changed' as
  89          * false and it will stay false for the next call as well.
  90          */
  91         if (likely(psy->changed)) {
  92                 psy->changed = false;
  93                 spin_unlock_irqrestore(&psy->changed_lock, flags);
  94                 class_for_each_device(power_supply_class, NULL, psy,
  95                                       __power_supply_changed_work);
  96                 power_supply_update_leds(psy);
  97                 atomic_notifier_call_chain(&power_supply_notifier,
  98                                 PSY_EVENT_PROP_CHANGED, psy);
  99                 kobject_uevent(&psy->dev.kobj, KOBJ_CHANGE);
 100                 spin_lock_irqsave(&psy->changed_lock, flags);
 101         }
 102
 103         /*
 104          * Hold the wakeup_source until all events are processed.
 105          * power_supply_changed() might have called again and have set 'changed'
 106          * to true.
 107          */
 108         if (likely(!psy->changed))
 109                 pm_relax(&psy->dev);
 110         spin_unlock_irqrestore(&psy->changed_lock, flags);
 111 }
 112
 113 void power_supply_changed(struct power_supply *psy)
 114 {
 115         unsigned long flags;
 116
 117         dev_dbg(&psy->dev, "%s\n", __func__);
 118
 119         spin_lock_irqsave(&psy->changed_lock, flags);
 120         psy->changed = true;
 121         pm_stay_awake(&psy->dev);
 122         spin_unlock_irqrestore(&psy->changed_lock, flags);
 123         schedule_work(&psy->changed_work);
 124 }
 125 EXPORT_SYMBOL_GPL(power_supply_changed);
 126
 127 /*
 128  * Notify that power supply was registered after parent finished the probing.
 129  *
 130  * Often power supply is registered from driver's probe function. However
 131  * calling power_supply_changed() directly from power_supply_register()
 132  * would lead to execution of get_property() function provided by the driver
 133  * too early - before the probe ends.
 134  *
 135  * Avoid that by waiting on parent's mutex.
 136  */
 137 static void power_supply_deferred_register_work(struct work_struct *work)
 138 {
 139         struct power_supply *psy = container_of(work, struct power_supply,
 140                                                 deferred_register_work.work);
 141
 142         if (psy->dev.parent)
 143                 mutex_lock(&psy->dev.parent->mutex);
 144
 145         power_supply_changed(psy);
 146
 147         if (psy->dev.parent)
 148                 mutex_unlock(&psy->dev.parent->mutex);
 149 }
 150
 151 #ifdef CONFIG_OF
 152 #include <linux/of.h>
 153
 154 static int __power_supply_populate_supplied_from(struct device *dev,
 155                                                  void *data)
 156 {
 157         struct power_supply *psy = data;
 158         struct power_supply *epsy = dev_get_drvdata(dev);
 159         struct device_node *np;
 160         int i = 0;
 161
 162         do {
 163                 np = of_parse_phandle(psy->of_node, "power-supplies", i++);
 164                 if (!np)
 165                         break;
 166
 167                 if (np == epsy->of_node) {
 168                         dev_info(&psy->dev, "%s: Found supply : %s\n",
 169                                 psy->desc->name, epsy->desc->name);
 170                         psy->supplied_from[i-1] = (char *)epsy->desc->name;
 171                         psy->num_supplies++;
 172                         of_node_put(np);
 173                         break;
 174                 }
 175                 of_node_put(np);
 176         } while (np);
 177
 178         return 0;
 179 }
 180
 181 static int power_supply_populate_supplied_from(struct power_supply *psy)
 182 {
 183         int error;
 184
 185         error = class_for_each_device(power_supply_class, NULL, psy,
 186                                       __power_supply_populate_supplied_from);
 187
 188         dev_dbg(&psy->dev, "%s %d\n", __func__, error);
 189
 190         return error;
 191 }
 192
 193 static int  __power_supply_find_supply_from_node(struct device *dev,
 194                                                  void *data)
 195 {
 196         struct device_node *np = data;
 197         struct power_supply *epsy = dev_get_drvdata(dev);
 198
 199         /* returning non-zero breaks out of class_for_each_device loop */
 200         if (epsy->of_node == np)
 201                 return 1;
 202
 203         return 0;
 204 }
 205
 206 static int power_supply_find_supply_from_node(struct device_node *supply_node)
 207 {
 208         int error;
 209
 210         /*
 211          * class_for_each_device() either returns its own errors or values
 212          * returned by __power_supply_find_supply_from_node().
 213          *
 214          * __power_supply_find_supply_from_node() will return 0 (no match)
 215          * or 1 (match).
 216          *
 217          * We return 0 if class_for_each_device() returned 1, -EPROBE_DEFER if
 218          * it returned 0, or error as returned by it.
 219          */
 220         error = class_for_each_device(power_supply_class, NULL, supply_node,
 221                                        __power_supply_find_supply_from_node);
 222
 223         return error ? (error == 1 ? 0 : error) : -EPROBE_DEFER;
 224 }
 225
 226 static int power_supply_check_supplies(struct power_supply *psy)
 227 {
 228         struct device_node *np;
 229         int cnt = 0;
 230
 231         /* If there is already a list honor it */
 232         if (psy->supplied_from && psy->num_supplies > 0)
 233                 return 0;
 234
 235         /* No device node found, nothing to do */
 236         if (!psy->of_node)
 237                 return 0;
 238
 239         do {
 240                 int ret;
 241
 242                 np = of_parse_phandle(psy->of_node, "power-supplies", cnt++);
 243                 if (!np)
 244                         break;
 245
 246                 ret = power_supply_find_supply_from_node(np);
 247                 of_node_put(np);
 248
 249                 if (ret) {
 250                         dev_dbg(&psy->dev, "Failed to find supply!\n");
 251                         return ret;
 252                 }
 253         } while (np);
 254
 255         /* Missing valid "power-supplies" entries */
 256         if (cnt == 1)
 257                 return 0;
 258
 259         /* All supplies found, allocate char ** array for filling */
 260         psy->supplied_from = devm_kzalloc(&psy->dev, sizeof(psy->supplied_from),
 261                                           GFP_KERNEL);
 262         if (!psy->supplied_from)
 263                 return -ENOMEM;
 264
 265         *psy->supplied_from = devm_kzalloc(&psy->dev,
 266                                            sizeof(char *) * (cnt - 1),
 267                                            GFP_KERNEL);
 268         if (!*psy->supplied_from)
 269                 return -ENOMEM;
 270
 271         return power_supply_populate_supplied_from(psy);
 272 }
 273 #else
 274 static int power_supply_check_supplies(struct power_supply *psy)
 275 {
 276         int nval, ret;
 277
 278         if (!psy->dev.parent)
 279                 return 0;
 280
 281         nval = device_property_read_string_array(psy->dev.parent,
 282                                                  "supplied-from", NULL, 0);
 283         if (nval <= 0)
 284                 return 0;
 285
 286         psy->supplied_from = devm_kmalloc_array(&psy->dev, nval,
 287                                                 sizeof(char *), GFP_KERNEL);
 288         if (!psy->supplied_from)
 289                 return -ENOMEM;
 290
 291         ret = device_property_read_string_array(psy->dev.parent,
 292                 "supplied-from", (const char **)psy->supplied_from, nval);
 293         if (ret < 0)
 294                 return ret;
 295
 296         psy->num_supplies = nval;
 297
 298         return 0;
 299 }
 300 #endif
 301
 302 struct psy_am_i_supplied_data {
 303         struct power_supply *psy;
 304         unsigned int count;
 305 };
 306
 307 static int __power_supply_am_i_supplied(struct device *dev, void *_data)
 308 {
 309         union power_supply_propval ret = {0,};
 310         struct power_supply *epsy = dev_get_drvdata(dev);
 311         struct psy_am_i_supplied_data *data = _data;
 312
 313         if (__power_supply_is_supplied_by(epsy, data->psy)) {
 314                 data->count++;
 315                 if (!epsy->desc->get_property(epsy, POWER_SUPPLY_PROP_ONLINE,
 316                                         &ret))
 317                         return ret.intval;
 318         }
 319
 320         return 0;
 321 }
 322
 323 int power_supply_am_i_supplied(struct power_supply *psy)
 324 {
 325         struct psy_am_i_supplied_data data = { psy, 0 };
 326         int error;
 327
 328         error = class_for_each_device(power_supply_class, NULL, &data,
 329                                       __power_supply_am_i_supplied);
 330
 331         dev_dbg(&psy->dev, "%s count %u err %d\n", __func__, data.count, error);
 332
 333         if (data.count == 0)
 334                 return -ENODEV;
 335
 336         return error;
 337 }
 338 EXPORT_SYMBOL_GPL(power_supply_am_i_supplied);
 339
 340 static int __power_supply_is_system_supplied(struct device *dev, void *data)
 341 {
 342         union power_supply_propval ret = {0,};
 343         struct power_supply *psy = dev_get_drvdata(dev);
 344         unsigned int *count = data;
 345
 346         (*count)++;
 347         if (psy->desc->type != POWER_SUPPLY_TYPE_BATTERY)
 348                 if (!psy->desc->get_property(psy, POWER_SUPPLY_PROP_ONLINE,
 349                                         &ret))
 350                         return ret.intval;
 351
 352         return 0;
 353 }
 354
 355 int power_supply_is_system_supplied(void)
 356 {
 357         int error;
 358         unsigned int count = 0;
 359
 360         error = class_for_each_device(power_supply_class, NULL, &count,
 361                                       __power_supply_is_system_supplied);
 362
 363         /*
 364          * If no power class device was found at all, most probably we are
 365          * running on a desktop system, so assume we are on mains power.
 366          */
 367         if (count == 0)
 368                 return 1;
 369
 370         return error;
 371 }
 372 EXPORT_SYMBOL_GPL(power_supply_is_system_supplied);
 373
 374 static int __power_supply_get_supplier_max_current(struct device *dev,
 375                                                    void *data)
 376 {
 377         union power_supply_propval ret = {0,};
 378         struct power_supply *epsy = dev_get_drvdata(dev);
 379         struct power_supply *psy = data;
 380
 381         if (__power_supply_is_supplied_by(epsy, psy))
 382                 if (!epsy->desc->get_property(epsy,
 383                                               POWER_SUPPLY_PROP_CURRENT_MAX,
 384                                               &ret))
 385                         return ret.intval;
 386
 387         return 0;
 388 }
 389
 390 int power_supply_set_input_current_limit_from_supplier(struct power_supply *psy)
 391 {
 392         union power_supply_propval val = {0,};
 393         int curr;
 394
 395         if (!psy->desc->set_property)
 396                 return -EINVAL;
 397
 398         /*
 399          * This function is not intended for use with a supply with multiple
 400          * suppliers, we simply pick the first supply to report a non 0
 401          * max-current.
 402          */
 403         curr = class_for_each_device(power_supply_class, NULL, psy,
 404                                       __power_supply_get_supplier_max_current);
 405         if (curr <= 0)
 406                 return (curr == 0) ? -ENODEV : curr;
 407
 408         val.intval = curr;
 409
 410         return psy->desc->set_property(psy,
 411                                 POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT, &val);
 412 }
 413 EXPORT_SYMBOL_GPL(power_supply_set_input_current_limit_from_supplier);
 414
 415 int power_supply_set_battery_charged(struct power_supply *psy)
 416 {
 417         if (atomic_read(&psy->use_cnt) >= 0 &&
 418                         psy->desc->type == POWER_SUPPLY_TYPE_BATTERY &&
 419                         psy->desc->set_charged) {
 420                 psy->desc->set_charged(psy);
 421                 return 0;
 422         }
 423
 424         return -EINVAL;
 425 }
 426 EXPORT_SYMBOL_GPL(power_supply_set_battery_charged);
 427
 428 static int power_supply_match_device_by_name(struct device *dev, const void *data)
 429 {
 430         const char *name = data;
 431         struct power_supply *psy = dev_get_drvdata(dev);
 432
 433         return strcmp(psy->desc->name, name) == 0;
 434 }
 435
 436 /**
 437  * power_supply_get_by_name() - Search for a power supply and returns its ref
 438  * @name: Power supply name to fetch
 439  *
 440  * If power supply was found, it increases reference count for the
 441  * internal power supply's device. The user should power_supply_put()
 442  * after usage.
 443  *
 444  * Return: On success returns a reference to a power supply with
 445  * matching name equals to @name, a NULL otherwise.
 446  */
 447 struct power_supply *power_supply_get_by_name(const char *name)
 448 {
 449         struct power_supply *psy = NULL;
 450         struct device *dev = class_find_device(power_supply_class, NULL, name,
 451                                         power_supply_match_device_by_name);
 452
 453         if (dev) {
 454                 psy = dev_get_drvdata(dev);
 455                 atomic_inc(&psy->use_cnt);
 456         }
 457
 458         return psy;
 459 }
 460 EXPORT_SYMBOL_GPL(power_supply_get_by_name);
 461
 462 /**
 463  * power_supply_put() - Drop reference obtained with power_supply_get_by_name
 464  * @psy: Reference to put
 465  *
 466  * The reference to power supply should be put before unregistering
 467  * the power supply.
 468  */
 469 void power_supply_put(struct power_supply *psy)
 470 {
 471         might_sleep();
 472
 473         atomic_dec(&psy->use_cnt);
 474         put_device(&psy->dev);
 475 }
 476 EXPORT_SYMBOL_GPL(power_supply_put);
 477
 478 #ifdef CONFIG_OF
 479 static int power_supply_match_device_node(struct device *dev, const void *data)
 480 {
 481         return dev->parent && dev->parent->of_node == data;
 482 }
 483
 484 /**
 485  * power_supply_get_by_phandle() - Search for a power supply and returns its ref
 486  * @np: Pointer to device node holding phandle property
 487  * @property: Name of property holding a power supply name
 488  *
 489  * If power supply was found, it increases reference count for the
 490  * internal power supply's device. The user should power_supply_put()
 491  * after usage.
 492  *
 493  * Return: On success returns a reference to a power supply with
 494  * matching name equals to value under @property, NULL or ERR_PTR otherwise.
 495  */
 496 struct power_supply *power_supply_get_by_phandle(struct device_node *np,
 497                                                         const char *property)
 498 {
 499         struct device_node *power_supply_np;
 500         struct power_supply *psy = NULL;
 501         struct device *dev;
 502
 503         power_supply_np = of_parse_phandle(np, property, 0);
 504         if (!power_supply_np)
 505                 return ERR_PTR(-ENODEV);
 506
 507         dev = class_find_device(power_supply_class, NULL, power_supply_np,
 508                                                 power_supply_match_device_node);
 509
 510         of_node_put(power_supply_np);
 511
 512         if (dev) {
 513                 psy = dev_get_drvdata(dev);
 514                 atomic_inc(&psy->use_cnt);
 515         }
 516
 517         return psy;
 518 }
 519 EXPORT_SYMBOL_GPL(power_supply_get_by_phandle);
 520
 521 static void devm_power_supply_put(struct device *dev, void *res)
 522 {
 523         struct power_supply **psy = res;
 524
 525         power_supply_put(*psy);
 526 }
 527
 528 /**
 529  * devm_power_supply_get_by_phandle() - Resource managed version of
 530  *  power_supply_get_by_phandle()
 531  * @dev: Pointer to device holding phandle property
 532  * @property: Name of property holding a power supply phandle
 533  *
 534  * Return: On success returns a reference to a power supply with
 535  * matching name equals to value under @property, NULL or ERR_PTR otherwise.
 536  */
 537 struct power_supply *devm_power_supply_get_by_phandle(struct device *dev,
 538                                                       const char *property)
 539 {
 540         struct power_supply **ptr, *psy;
 541
 542         if (!dev->of_node)
 543                 return ERR_PTR(-ENODEV);
 544
 545         ptr = devres_alloc(devm_power_supply_put, sizeof(*ptr), GFP_KERNEL);
 546         if (!ptr)
 547                 return ERR_PTR(-ENOMEM);
 548
 549         psy = power_supply_get_by_phandle(dev->of_node, property);
 550         if (IS_ERR_OR_NULL(psy)) {
 551                 devres_free(ptr);
 552         } else {
 553                 *ptr = psy;
 554                 devres_add(dev, ptr);
 555         }
 556         return psy;
 557 }
 558 EXPORT_SYMBOL_GPL(devm_power_supply_get_by_phandle);
 559 #endif /* CONFIG_OF */
 560
 561 int power_supply_get_battery_info(struct power_supply *psy,
 562                                   struct power_supply_battery_info *info)
 563 {
 564         struct device_node *battery_np;
 565         const char *value;
 566         int err;
 567
 568         info->energy_full_design_uwh         = -EINVAL;
 569         info->charge_full_design_uah         = -EINVAL;
 570         info->voltage_min_design_uv          = -EINVAL;
 571         info->precharge_current_ua           = -EINVAL;
 572         info->charge_term_current_ua         = -EINVAL;
 573         info->constant_charge_current_max_ua = -EINVAL;
 574         info->constant_charge_voltage_max_uv = -EINVAL;
 575
 576         if (!psy->of_node) {
 577                 dev_warn(&psy->dev, "%s currently only supports devicetree\n",
 578                          __func__);
 579                 return -ENXIO;
 580         }
 581
 582         battery_np = of_parse_phandle(psy->of_node, "monitored-battery", 0);
 583         if (!battery_np)
 584                 return -ENODEV;
 585
 586         err = of_property_read_string(battery_np, "compatible", &value);
 587         if (err)
 588                 return err;
 589
 590         if (strcmp("simple-battery", value))
 591                 return -ENODEV;
 592
 593         /* The property and field names below must correspond to elements
 594          * in enum power_supply_property. For reasoning, see
 595          * Documentation/power/power_supply_class.txt.
 596          */
 597
 598         of_property_read_u32(battery_np, "energy-full-design-microwatt-hours",
 599                              &info->energy_full_design_uwh);
 600         of_property_read_u32(battery_np, "charge-full-design-microamp-hours",
 601                              &info->charge_full_design_uah);
 602         of_property_read_u32(battery_np, "voltage-min-design-microvolt",
 603                              &info->voltage_min_design_uv);
 604         of_property_read_u32(battery_np, "precharge-current-microamp",
 605                              &info->precharge_current_ua);
 606         of_property_read_u32(battery_np, "charge-term-current-microamp",
 607                              &info->charge_term_current_ua);
 608         of_property_read_u32(battery_np, "constant_charge_current_max_microamp",
 609                              &info->constant_charge_current_max_ua);
 610         of_property_read_u32(battery_np, "constant_charge_voltage_max_microvolt",
 611                              &info->constant_charge_voltage_max_uv);
 612
 613         return 0;
 614 }
 615 EXPORT_SYMBOL_GPL(power_supply_get_battery_info);
 616
 617 int power_supply_get_property(struct power_supply *psy,
 618                             enum power_supply_property psp,
 619                             union power_supply_propval *val)
 620 {
 621         if (atomic_read(&psy->use_cnt) <= 0) {
 622                 if (!psy->initialized)
 623                         return -EAGAIN;
 624                 return -ENODEV;
 625         }
 626
 627         return psy->desc->get_property(psy, psp, val);
 628 }
 629 EXPORT_SYMBOL_GPL(power_supply_get_property);
 630
 631 int power_supply_set_property(struct power_supply *psy,
 632                             enum power_supply_property psp,
 633                             const union power_supply_propval *val)
 634 {
 635         if (atomic_read(&psy->use_cnt) <= 0 || !psy->desc->set_property)
 636                 return -ENODEV;
 637
 638         return psy->desc->set_property(psy, psp, val);
 639 }
 640 EXPORT_SYMBOL_GPL(power_supply_set_property);
 641
 642 int power_supply_property_is_writeable(struct power_supply *psy,
 643                                         enum power_supply_property psp)
 644 {
 645         if (atomic_read(&psy->use_cnt) <= 0 ||
 646                         !psy->desc->property_is_writeable)
 647                 return -ENODEV;
 648
 649         return psy->desc->property_is_writeable(psy, psp);
 650 }
 651 EXPORT_SYMBOL_GPL(power_supply_property_is_writeable);
 652
 653 void power_supply_external_power_changed(struct power_supply *psy)
 654 {
 655         if (atomic_read(&psy->use_cnt) <= 0 ||
 656                         !psy->desc->external_power_changed)
 657                 return;
 658
 659         psy->desc->external_power_changed(psy);
 660 }
 661 EXPORT_SYMBOL_GPL(power_supply_external_power_changed);
 662
 663 int power_supply_powers(struct power_supply *psy, struct device *dev)
 664 {
 665         return sysfs_create_link(&psy->dev.kobj, &dev->kobj, "powers");
 666 }
 667 EXPORT_SYMBOL_GPL(power_supply_powers);
 668
 669 static void power_supply_dev_release(struct device *dev)
 670 {
 671         struct power_supply *psy = container_of(dev, struct power_supply, dev);
 672         pr_debug("device: '%s': %s\n", dev_name(dev), __func__);
 673         kfree(psy);
 674 }
 675
 676 int power_supply_reg_notifier(struct notifier_block *nb)
 677 {
 678         return atomic_notifier_chain_register(&power_supply_notifier, nb);
 679 }
 680 EXPORT_SYMBOL_GPL(power_supply_reg_notifier);
 681
 682 void power_supply_unreg_notifier(struct notifier_block *nb)
 683 {
 684         atomic_notifier_chain_unregister(&power_supply_notifier, nb);
 685 }
 686 EXPORT_SYMBOL_GPL(power_supply_unreg_notifier);
 687
 688 #ifdef CONFIG_THERMAL
 689 static int power_supply_read_temp(struct thermal_zone_device *tzd,
 690                 int *temp)
 691 {
 692         struct power_supply *psy;
 693         union power_supply_propval val;
 694         int ret;
 695
 696         WARN_ON(tzd == NULL);
 697         psy = tzd->devdata;
 698         ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_TEMP, &val);
 699         if (ret)
 700                 return ret;
 701
 702         /* Convert tenths of degree Celsius to milli degree Celsius. */
 703         *temp = val.intval * 100;
 704
 705         return ret;
 706 }
 707
 708 static struct thermal_zone_device_ops psy_tzd_ops = {
 709         .get_temp = power_supply_read_temp,
 710 };
 711
 712 static int psy_register_thermal(struct power_supply *psy)
 713 {
 714         int i;
 715
 716         if (psy->desc->no_thermal)
 717                 return 0;
 718
 719         /* Register battery zone device psy reports temperature */
 720         for (i = 0; i < psy->desc->num_properties; i++) {
 721                 if (psy->desc->properties[i] == POWER_SUPPLY_PROP_TEMP) {
 722                         psy->tzd = thermal_zone_device_register(psy->desc->name,
 723                                         0, 0, psy, &psy_tzd_ops, NULL, 0, 0);
 724                         return PTR_ERR_OR_ZERO(psy->tzd);
 725                 }
 726         }
 727         return 0;
 728 }
 729
 730 static void psy_unregister_thermal(struct power_supply *psy)
 731 {
 732         if (IS_ERR_OR_NULL(psy->tzd))
 733                 return;
 734         thermal_zone_device_unregister(psy->tzd);
 735 }
 736
 737 /* thermal cooling device callbacks */
 738 static int ps_get_max_charge_cntl_limit(struct thermal_cooling_device *tcd,
 739                                         unsigned long *state)
 740 {
 741         struct power_supply *psy;
 742         union power_supply_propval val;
 743         int ret;
 744
 745         psy = tcd->devdata;
 746         ret = power_supply_get_property(psy,
 747                         POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT_MAX, &val);
 748         if (ret)
 749                 return ret;
 750
 751         *state = val.intval;
 752
 753         return ret;
 754 }
 755
 756 static int ps_get_cur_chrage_cntl_limit(struct thermal_cooling_device *tcd,
 757                                         unsigned long *state)
 758 {
 759         struct power_supply *psy;
 760         union power_supply_propval val;
 761         int ret;
 762
 763         psy = tcd->devdata;
 764         ret = power_supply_get_property(psy,
 765                         POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT, &val);
 766         if (ret)
 767                 return ret;
 768
 769         *state = val.intval;
 770
 771         return ret;
 772 }
 773
 774 static int ps_set_cur_charge_cntl_limit(struct thermal_cooling_device *tcd,
 775                                         unsigned long state)
 776 {
 777         struct power_supply *psy;
 778         union power_supply_propval val;
 779         int ret;
 780
 781         psy = tcd->devdata;
 782         val.intval = state;
 783         ret = psy->desc->set_property(psy,
 784                 POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT, &val);
 785
 786         return ret;
 787 }
 788
 789 static const struct thermal_cooling_device_ops psy_tcd_ops = {
 790         .get_max_state = ps_get_max_charge_cntl_limit,
 791         .get_cur_state = ps_get_cur_chrage_cntl_limit,
 792         .set_cur_state = ps_set_cur_charge_cntl_limit,
 793 };
 794
 795 static int psy_register_cooler(struct power_supply *psy)
 796 {
 797         int i;
 798
 799         /* Register for cooling device if psy can control charging */
 800         for (i = 0; i < psy->desc->num_properties; i++) {
 801                 if (psy->desc->properties[i] ==
 802                                 POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT) {
 803                         psy->tcd = thermal_cooling_device_register(
 804                                                         (char *)psy->desc->name,
 805                                                         psy, &psy_tcd_ops);
 806                         return PTR_ERR_OR_ZERO(psy->tcd);
 807                 }
 808         }
 809         return 0;
 810 }
 811
 812 static void psy_unregister_cooler(struct power_supply *psy)
 813 {
 814         if (IS_ERR_OR_NULL(psy->tcd))
 815                 return;
 816         thermal_cooling_device_unregister(psy->tcd);
 817 }
 818 #else
 819 static int psy_register_thermal(struct power_supply *psy)
 820 {
 821         return 0;
 822 }
 823
 824 static void psy_unregister_thermal(struct power_supply *psy)
 825 {
 826 }
 827
 828 static int psy_register_cooler(struct power_supply *psy)
 829 {
 830         return 0;
 831 }
 832
 833 static void psy_unregister_cooler(struct power_supply *psy)
 834 {
 835 }
 836 #endif
 837
 838 static struct power_supply *__must_check
 839 __power_supply_register(struct device *parent,
 840                                    const struct power_supply_desc *desc,
 841                                    const struct power_supply_config *cfg,
 842                                    bool ws)
 843 {
 844         struct device *dev;
 845         struct power_supply *psy;
 846         int rc;
 847
 848         if (!parent)
 849                 pr_warn("%s: Expected proper parent device for '%s'\n",
 850                         __func__, desc->name);
 851
 852         psy = kzalloc(sizeof(*psy), GFP_KERNEL);
 853         if (!psy)
 854                 return ERR_PTR(-ENOMEM);
 855
 856         dev = &psy->dev;
 857
 858         device_initialize(dev);
 859
 860         dev->class = power_supply_class;
 861         dev->type = &power_supply_dev_type;
 862         dev->parent = parent;
 863         dev->release = power_supply_dev_release;
 864         dev_set_drvdata(dev, psy);
 865         psy->desc = desc;
 866         if (cfg) {
 867                 psy->drv_data = cfg->drv_data;
 868                 psy->of_node = cfg->of_node;
 869                 psy->supplied_to = cfg->supplied_to;
 870                 psy->num_supplicants = cfg->num_supplicants;
 871         }
 872
 873         rc = dev_set_name(dev, "%s", desc->name);
 874         if (rc)
 875                 goto dev_set_name_failed;
 876
 877         INIT_WORK(&psy->changed_work, power_supply_changed_work);
 878         INIT_DELAYED_WORK(&psy->deferred_register_work,
 879                           power_supply_deferred_register_work);
 880
 881         rc = power_supply_check_supplies(psy);
 882         if (rc) {
 883                 dev_info(dev, "Not all required supplies found, defer probe\n");
 884                 goto check_supplies_failed;
 885         }
 886
 887         spin_lock_init(&psy->changed_lock);
 888         rc = device_init_wakeup(dev, ws);
 889         if (rc)
 890                 goto wakeup_init_failed;
 891
 892         rc = device_add(dev);
 893         if (rc)
 894                 goto device_add_failed;
 895
 896         rc = psy_register_thermal(psy);
 897         if (rc)
 898                 goto register_thermal_failed;
 899
 900         rc = psy_register_cooler(psy);
 901         if (rc)
 902                 goto register_cooler_failed;
 903
 904         rc = power_supply_create_triggers(psy);
 905         if (rc)
 906                 goto create_triggers_failed;
 907
 908         /*
 909          * Update use_cnt after any uevents (most notably from device_add()).
 910          * We are here still during driver's probe but
 911          * the power_supply_uevent() calls back driver's get_property
 912          * method so:
 913          * 1. Driver did not assigned the returned struct power_supply,
 914          * 2. Driver could not finish initialization (anything in its probe
 915          *    after calling power_supply_register()).
 916          */
 917         atomic_inc(&psy->use_cnt);
 918         psy->initialized = true;
 919
 920         queue_delayed_work(system_power_efficient_wq,
 921                            &psy->deferred_register_work,
 922                            POWER_SUPPLY_DEFERRED_REGISTER_TIME);
 923
 924         return psy;
 925
 926 create_triggers_failed:
 927         psy_unregister_cooler(psy);
 928 register_cooler_failed:
 929         psy_unregister_thermal(psy);
 930 register_thermal_failed:
 931         device_del(dev);
 932 device_add_failed:
 933 wakeup_init_failed:
 934 check_supplies_failed:
 935 dev_set_name_failed:
 936         put_device(dev);
 937         return ERR_PTR(rc);
 938 }
 939
 940 /**
 941  * power_supply_register() - Register new power supply
 942  * @parent:     Device to be a parent of power supply's device, usually
 943  *              the device which probe function calls this
 944  * @desc:       Description of power supply, must be valid through whole
 945  *              lifetime of this power supply
 946  * @cfg:        Run-time specific configuration accessed during registering,
 947  *              may be NULL
 948  *
 949  * Return: A pointer to newly allocated power_supply on success
 950  * or ERR_PTR otherwise.
 951  * Use power_supply_unregister() on returned power_supply pointer to release
 952  * resources.
 953  */
 954 struct power_supply *__must_check power_supply_register(struct device *parent,
 955                 const struct power_supply_desc *desc,
 956                 const struct power_supply_config *cfg)
 957 {
 958         return __power_supply_register(parent, desc, cfg, true);
 959 }
 960 EXPORT_SYMBOL_GPL(power_supply_register);
 961
 962 /**
 963  * power_supply_register_no_ws() - Register new non-waking-source power supply
 964  * @parent:     Device to be a parent of power supply's device, usually
 965  *              the device which probe function calls this
 966  * @desc:       Description of power supply, must be valid through whole
 967  *              lifetime of this power supply
 968  * @cfg:        Run-time specific configuration accessed during registering,
 969  *              may be NULL
 970  *
 971  * Return: A pointer to newly allocated power_supply on success
 972  * or ERR_PTR otherwise.
 973  * Use power_supply_unregister() on returned power_supply pointer to release
 974  * resources.
 975  */
 976 struct power_supply *__must_check
 977 power_supply_register_no_ws(struct device *parent,
 978                 const struct power_supply_desc *desc,
 979                 const struct power_supply_config *cfg)
 980 {
 981         return __power_supply_register(parent, desc, cfg, false);
 982 }
 983 EXPORT_SYMBOL_GPL(power_supply_register_no_ws);
 984
 985 static void devm_power_supply_release(struct device *dev, void *res)
 986 {
 987         struct power_supply **psy = res;
 988
 989         power_supply_unregister(*psy);
 990 }
 991
 992 /**
 993  * devm_power_supply_register() - Register managed power supply
 994  * @parent:     Device to be a parent of power supply's device, usually
 995  *              the device which probe function calls this
 996  * @desc:       Description of power supply, must be valid through whole
 997  *              lifetime of this power supply
 998  * @cfg:        Run-time specific configuration accessed during registering,
 999  *              may be NULL
1000  *
1001  * Return: A pointer to newly allocated power_supply on success
1002  * or ERR_PTR otherwise.
1003  * The returned power_supply pointer will be automatically unregistered
1004  * on driver detach.
1005  */
1006 struct power_supply *__must_check
1007 devm_power_supply_register(struct device *parent,
1008                 const struct power_supply_desc *desc,
1009                 const struct power_supply_config *cfg)
1010 {
1011         struct power_supply **ptr, *psy;
1012
1013         ptr = devres_alloc(devm_power_supply_release, sizeof(*ptr), GFP_KERNEL);
1014
1015         if (!ptr)
1016                 return ERR_PTR(-ENOMEM);
1017         psy = __power_supply_register(parent, desc, cfg, true);
1018         if (IS_ERR(psy)) {
1019                 devres_free(ptr);
1020         } else {
1021                 *ptr = psy;
1022                 devres_add(parent, ptr);
1023         }
1024         return psy;
1025 }
1026 EXPORT_SYMBOL_GPL(devm_power_supply_register);
1027
1028 /**
1029  * devm_power_supply_register_no_ws() - Register managed non-waking-source power supply
1030  * @parent:     Device to be a parent of power supply's device, usually
1031  *              the device which probe function calls this
1032  * @desc:       Description of power supply, must be valid through whole
1033  *              lifetime of this power supply
1034  * @cfg:        Run-time specific configuration accessed during registering,
1035  *              may be NULL
1036  *
1037  * Return: A pointer to newly allocated power_supply on success
1038  * or ERR_PTR otherwise.
1039  * The returned power_supply pointer will be automatically unregistered
1040  * on driver detach.
1041  */
1042 struct power_supply *__must_check
1043 devm_power_supply_register_no_ws(struct device *parent,
1044                 const struct power_supply_desc *desc,
1045                 const struct power_supply_config *cfg)
1046 {
1047         struct power_supply **ptr, *psy;
1048
1049         ptr = devres_alloc(devm_power_supply_release, sizeof(*ptr), GFP_KERNEL);
1050
1051         if (!ptr)
1052                 return ERR_PTR(-ENOMEM);
1053         psy = __power_supply_register(parent, desc, cfg, false);
1054         if (IS_ERR(psy)) {
1055                 devres_free(ptr);
1056         } else {
1057                 *ptr = psy;
1058                 devres_add(parent, ptr);
1059         }
1060         return psy;
1061 }
1062 EXPORT_SYMBOL_GPL(devm_power_supply_register_no_ws);
1063
1064 /**
1065  * power_supply_unregister() - Remove this power supply from system
1066  * @psy:        Pointer to power supply to unregister
1067  *
1068  * Remove this power supply from the system. The resources of power supply
1069  * will be freed here or on last power_supply_put() call.
1070  */
1071 void power_supply_unregister(struct power_supply *psy)
1072 {
1073         WARN_ON(atomic_dec_return(&psy->use_cnt));
1074         cancel_work_sync(&psy->changed_work);
1075         cancel_delayed_work_sync(&psy->deferred_register_work);
1076         sysfs_remove_link(&psy->dev.kobj, "powers");
1077         power_supply_remove_triggers(psy);
1078         psy_unregister_cooler(psy);
1079         psy_unregister_thermal(psy);
1080         device_init_wakeup(&psy->dev, false);
1081         device_unregister(&psy->dev);
1082 }
1083 EXPORT_SYMBOL_GPL(power_supply_unregister);
1084
1085 void *power_supply_get_drvdata(struct power_supply *psy)
1086 {
1087         return psy->drv_data;
1088 }
1089 EXPORT_SYMBOL_GPL(power_supply_get_drvdata);
1090
1091 static int __init power_supply_class_init(void)
1092 {
1093         power_supply_class = class_create(THIS_MODULE, "power_supply");
1094
1095         if (IS_ERR(power_supply_class))
1096                 return PTR_ERR(power_supply_class);
1097
1098         power_supply_class->dev_uevent = power_supply_uevent;
1099         power_supply_init_attrs(&power_supply_dev_type);
1100
1101         return 0;
1102 }
1103
1104 static void __exit power_supply_class_exit(void)
1105 {
1106         class_destroy(power_supply_class);
1107 }
1108
1109 subsys_initcall(power_supply_class_init);
1110 module_exit(power_supply_class_exit);
1111
1112 MODULE_DESCRIPTION("Universal power supply monitor class");
1113 MODULE_AUTHOR("Ian Molton <spyro@f2s.com>, "
1114               "Szabolcs Gyurko, "
1115               "Anton Vorontsov <cbou@mail.ru>");
1116 MODULE_LICENSE("GPL");