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/thermal.h>
  24 #include "power_supply.h"
  25
  26 /* exported for the APM Power driver, APM emulation */
  27 struct class *power_supply_class;
  28 EXPORT_SYMBOL_GPL(power_supply_class);
  29
  30 ATOMIC_NOTIFIER_HEAD(power_supply_notifier);
  31 EXPORT_SYMBOL_GPL(power_supply_notifier);
  32
  33 static struct device_type power_supply_dev_type;
  34
  35 #define POWER_SUPPLY_DEFERRED_REGISTER_TIME     msecs_to_jiffies(10)
  36
  37 static bool __power_supply_is_supplied_by(struct power_supply *supplier,
  38                                          struct power_supply *supply)
  39 {
  40         int i;
  41
  42         if (!supply->supplied_from && !supplier->supplied_to)
  43                 return false;
  44
  45         /* Support both supplied_to and supplied_from modes */
  46         if (supply->supplied_from) {
  47                 if (!supplier->desc->name)
  48                         return false;
  49                 for (i = 0; i < supply->num_supplies; i++)
  50                         if (!strcmp(supplier->desc->name, supply->supplied_from[i]))
  51                                 return true;
  52         } else {
  53                 if (!supply->desc->name)
  54                         return false;
  55                 for (i = 0; i < supplier->num_supplicants; i++)
  56                         if (!strcmp(supplier->supplied_to[i], supply->desc->name))
  57                                 return true;
  58         }
  59
  60         return false;
  61 }
  62
  63 static int __power_supply_changed_work(struct device *dev, void *data)
  64 {
  65         struct power_supply *psy = data;
  66         struct power_supply *pst = dev_get_drvdata(dev);
  67
  68         if (__power_supply_is_supplied_by(psy, pst)) {
  69                 if (pst->desc->external_power_changed)
  70                         pst->desc->external_power_changed(pst);
  71         }
  72
  73         return 0;
  74 }
  75
  76 static void power_supply_changed_work(struct work_struct *work)
  77 {
  78         unsigned long flags;
  79         struct power_supply *psy = container_of(work, struct power_supply,
  80                                                 changed_work);
  81
  82         dev_dbg(&psy->dev, "%s\n", __func__);
  83
  84         spin_lock_irqsave(&psy->changed_lock, flags);
  85         /*
  86          * Check 'changed' here to avoid issues due to race between
  87          * power_supply_changed() and this routine. In worst case
  88          * power_supply_changed() can be called again just before we take above
  89          * lock. During the first call of this routine we will mark 'changed' as
  90          * false and it will stay false for the next call as well.
  91          */
  92         if (likely(psy->changed)) {
  93                 psy->changed = false;
  94                 spin_unlock_irqrestore(&psy->changed_lock, flags);
  95                 class_for_each_device(power_supply_class, NULL, psy,
  96                                       __power_supply_changed_work);
  97                 power_supply_update_leds(psy);
  98                 atomic_notifier_call_chain(&power_supply_notifier,
  99                                 PSY_EVENT_PROP_CHANGED, psy);
 100                 kobject_uevent(&psy->dev.kobj, KOBJ_CHANGE);
 101                 spin_lock_irqsave(&psy->changed_lock, flags);
 102         }
 103
 104         /*
 105          * Hold the wakeup_source until all events are processed.
 106          * power_supply_changed() might have called again and have set 'changed'
 107          * to true.
 108          */
 109         if (likely(!psy->changed))
 110                 pm_relax(&psy->dev);
 111         spin_unlock_irqrestore(&psy->changed_lock, flags);
 112 }
 113
 114 void power_supply_changed(struct power_supply *psy)
 115 {
 116         unsigned long flags;
 117
 118         dev_dbg(&psy->dev, "%s\n", __func__);
 119
 120         spin_lock_irqsave(&psy->changed_lock, flags);
 121         psy->changed = true;
 122         pm_stay_awake(&psy->dev);
 123         spin_unlock_irqrestore(&psy->changed_lock, flags);
 124         schedule_work(&psy->changed_work);
 125 }
 126 EXPORT_SYMBOL_GPL(power_supply_changed);
 127
 128 /*
 129  * Notify that power supply was registered after parent finished the probing.
 130  *
 131  * Often power supply is registered from driver's probe function. However
 132  * calling power_supply_changed() directly from power_supply_register()
 133  * would lead to execution of get_property() function provided by the driver
 134  * too early - before the probe ends.
 135  *
 136  * Avoid that by waiting on parent's mutex.
 137  */
 138 static void power_supply_deferred_register_work(struct work_struct *work)
 139 {
 140         struct power_supply *psy = container_of(work, struct power_supply,
 141                                                 deferred_register_work.work);
 142
 143         if (psy->dev.parent) {
 144                 while (!mutex_trylock(&psy->dev.parent->mutex)) {
 145                         if (psy->removing)
 146                                 return;
 147                         msleep(10);
 148                 }
 149         }
 150
 151         power_supply_changed(psy);
 152
 153         if (psy->dev.parent)
 154                 mutex_unlock(&psy->dev.parent->mutex);
 155 }
 156
 157 #ifdef CONFIG_OF
 158 #include <linux/of.h>
 159
 160 static int __power_supply_populate_supplied_from(struct device *dev,
 161                                                  void *data)
 162 {
 163         struct power_supply *psy = data;
 164         struct power_supply *epsy = dev_get_drvdata(dev);
 165         struct device_node *np;
 166         int i = 0;
 167
 168         do {
 169                 np = of_parse_phandle(psy->of_node, "power-supplies", i++);
 170                 if (!np)
 171                         break;
 172
 173                 if (np == epsy->of_node) {
 174                         dev_info(&psy->dev, "%s: Found supply : %s\n",
 175                                 psy->desc->name, epsy->desc->name);
 176                         psy->supplied_from[i-1] = (char *)epsy->desc->name;
 177                         psy->num_supplies++;
 178                         of_node_put(np);
 179                         break;
 180                 }
 181                 of_node_put(np);
 182         } while (np);
 183
 184         return 0;
 185 }
 186
 187 static int power_supply_populate_supplied_from(struct power_supply *psy)
 188 {
 189         int error;
 190
 191         error = class_for_each_device(power_supply_class, NULL, psy,
 192                                       __power_supply_populate_supplied_from);
 193
 194         dev_dbg(&psy->dev, "%s %d\n", __func__, error);
 195
 196         return error;
 197 }
 198
 199 static int  __power_supply_find_supply_from_node(struct device *dev,
 200                                                  void *data)
 201 {
 202         struct device_node *np = data;
 203         struct power_supply *epsy = dev_get_drvdata(dev);
 204
 205         /* returning non-zero breaks out of class_for_each_device loop */
 206         if (epsy->of_node == np)
 207                 return 1;
 208
 209         return 0;
 210 }
 211
 212 static int power_supply_find_supply_from_node(struct device_node *supply_node)
 213 {
 214         int error;
 215
 216         /*
 217          * class_for_each_device() either returns its own errors or values
 218          * returned by __power_supply_find_supply_from_node().
 219          *
 220          * __power_supply_find_supply_from_node() will return 0 (no match)
 221          * or 1 (match).
 222          *
 223          * We return 0 if class_for_each_device() returned 1, -EPROBE_DEFER if
 224          * it returned 0, or error as returned by it.
 225          */
 226         error = class_for_each_device(power_supply_class, NULL, supply_node,
 227                                        __power_supply_find_supply_from_node);
 228
 229         return error ? (error == 1 ? 0 : error) : -EPROBE_DEFER;
 230 }
 231
 232 static int power_supply_check_supplies(struct power_supply *psy)
 233 {
 234         struct device_node *np;
 235         int cnt = 0;
 236
 237         /* If there is already a list honor it */
 238         if (psy->supplied_from && psy->num_supplies > 0)
 239                 return 0;
 240
 241         /* No device node found, nothing to do */
 242         if (!psy->of_node)
 243                 return 0;
 244
 245         do {
 246                 int ret;
 247
 248                 np = of_parse_phandle(psy->of_node, "power-supplies", cnt++);
 249                 if (!np)
 250                         break;
 251
 252                 ret = power_supply_find_supply_from_node(np);
 253                 of_node_put(np);
 254
 255                 if (ret) {
 256                         dev_dbg(&psy->dev, "Failed to find supply!\n");
 257                         return ret;
 258                 }
 259         } while (np);
 260
 261         /* Missing valid "power-supplies" entries */
 262         if (cnt == 1)
 263                 return 0;
 264
 265         /* All supplies found, allocate char ** array for filling */
 266         psy->supplied_from = devm_kzalloc(&psy->dev, sizeof(psy->supplied_from),
 267                                           GFP_KERNEL);
 268         if (!psy->supplied_from)
 269                 return -ENOMEM;
 270
 271         *psy->supplied_from = devm_kzalloc(&psy->dev,
 272                                            sizeof(char *) * (cnt - 1),
 273                                            GFP_KERNEL);
 274         if (!*psy->supplied_from)
 275                 return -ENOMEM;
 276
 277         return power_supply_populate_supplied_from(psy);
 278 }
 279 #else
 280 static int power_supply_check_supplies(struct power_supply *psy)
 281 {
 282         int nval, ret;
 283
 284         if (!psy->dev.parent)
 285                 return 0;
 286
 287         nval = device_property_read_string_array(psy->dev.parent,
 288                                                  "supplied-from", NULL, 0);
 289         if (nval <= 0)
 290                 return 0;
 291
 292         psy->supplied_from = devm_kmalloc_array(&psy->dev, nval,
 293                                                 sizeof(char *), GFP_KERNEL);
 294         if (!psy->supplied_from)
 295                 return -ENOMEM;
 296
 297         ret = device_property_read_string_array(psy->dev.parent,
 298                 "supplied-from", (const char **)psy->supplied_from, nval);
 299         if (ret < 0)
 300                 return ret;
 301
 302         psy->num_supplies = nval;
 303
 304         return 0;
 305 }
 306 #endif
 307
 308 struct psy_am_i_supplied_data {
 309         struct power_supply *psy;
 310         unsigned int count;
 311 };
 312
 313 static int __power_supply_am_i_supplied(struct device *dev, void *_data)
 314 {
 315         union power_supply_propval ret = {0,};
 316         struct power_supply *epsy = dev_get_drvdata(dev);
 317         struct psy_am_i_supplied_data *data = _data;
 318
 319         if (__power_supply_is_supplied_by(epsy, data->psy)) {
 320                 data->count++;
 321                 if (!epsy->desc->get_property(epsy, POWER_SUPPLY_PROP_ONLINE,
 322                                         &ret))
 323                         return ret.intval;
 324         }
 325
 326         return 0;
 327 }
 328
 329 int power_supply_am_i_supplied(struct power_supply *psy)
 330 {
 331         struct psy_am_i_supplied_data data = { psy, 0 };
 332         int error;
 333
 334         error = class_for_each_device(power_supply_class, NULL, &data,
 335                                       __power_supply_am_i_supplied);
 336
 337         dev_dbg(&psy->dev, "%s count %u err %d\n", __func__, data.count, error);
 338
 339         if (data.count == 0)
 340                 return -ENODEV;
 341
 342         return error;
 343 }
 344 EXPORT_SYMBOL_GPL(power_supply_am_i_supplied);
 345
 346 static int __power_supply_is_system_supplied(struct device *dev, void *data)
 347 {
 348         union power_supply_propval ret = {0,};
 349         struct power_supply *psy = dev_get_drvdata(dev);
 350         unsigned int *count = data;
 351
 352         (*count)++;
 353         if (psy->desc->type != POWER_SUPPLY_TYPE_BATTERY)
 354                 if (!psy->desc->get_property(psy, POWER_SUPPLY_PROP_ONLINE,
 355                                         &ret))
 356                         return ret.intval;
 357
 358         return 0;
 359 }
 360
 361 int power_supply_is_system_supplied(void)
 362 {
 363         int error;
 364         unsigned int count = 0;
 365
 366         error = class_for_each_device(power_supply_class, NULL, &count,
 367                                       __power_supply_is_system_supplied);
 368
 369         /*
 370          * If no power class device was found at all, most probably we are
 371          * running on a desktop system, so assume we are on mains power.
 372          */
 373         if (count == 0)
 374                 return 1;
 375
 376         return error;
 377 }
 378 EXPORT_SYMBOL_GPL(power_supply_is_system_supplied);
 379
 380 static int __power_supply_get_supplier_max_current(struct device *dev,
 381                                                    void *data)
 382 {
 383         union power_supply_propval ret = {0,};
 384         struct power_supply *epsy = dev_get_drvdata(dev);
 385         struct power_supply *psy = data;
 386
 387         if (__power_supply_is_supplied_by(epsy, psy))
 388                 if (!epsy->desc->get_property(epsy,
 389                                               POWER_SUPPLY_PROP_CURRENT_MAX,
 390                                               &ret))
 391                         return ret.intval;
 392
 393         return 0;
 394 }
 395
 396 int power_supply_set_input_current_limit_from_supplier(struct power_supply *psy)
 397 {
 398         union power_supply_propval val = {0,};
 399         int curr;
 400
 401         if (!psy->desc->set_property)
 402                 return -EINVAL;
 403
 404         /*
 405          * This function is not intended for use with a supply with multiple
 406          * suppliers, we simply pick the first supply to report a non 0
 407          * max-current.
 408          */
 409         curr = class_for_each_device(power_supply_class, NULL, psy,
 410                                       __power_supply_get_supplier_max_current);
 411         if (curr <= 0)
 412                 return (curr == 0) ? -ENODEV : curr;
 413
 414         val.intval = curr;
 415
 416         return psy->desc->set_property(psy,
 417                                 POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT, &val);
 418 }
 419 EXPORT_SYMBOL_GPL(power_supply_set_input_current_limit_from_supplier);
 420
 421 int power_supply_set_battery_charged(struct power_supply *psy)
 422 {
 423         if (atomic_read(&psy->use_cnt) >= 0 &&
 424                         psy->desc->type == POWER_SUPPLY_TYPE_BATTERY &&
 425                         psy->desc->set_charged) {
 426                 psy->desc->set_charged(psy);
 427                 return 0;
 428         }
 429
 430         return -EINVAL;
 431 }
 432 EXPORT_SYMBOL_GPL(power_supply_set_battery_charged);
 433
 434 static int power_supply_match_device_by_name(struct device *dev, const void *data)
 435 {
 436         const char *name = data;
 437         struct power_supply *psy = dev_get_drvdata(dev);
 438
 439         return strcmp(psy->desc->name, name) == 0;
 440 }
 441
 442 /**
 443  * power_supply_get_by_name() - Search for a power supply and returns its ref
 444  * @name: Power supply name to fetch
 445  *
 446  * If power supply was found, it increases reference count for the
 447  * internal power supply's device. The user should power_supply_put()
 448  * after usage.
 449  *
 450  * Return: On success returns a reference to a power supply with
 451  * matching name equals to @name, a NULL otherwise.
 452  */
 453 struct power_supply *power_supply_get_by_name(const char *name)
 454 {
 455         struct power_supply *psy = NULL;
 456         struct device *dev = class_find_device(power_supply_class, NULL, name,
 457                                         power_supply_match_device_by_name);
 458
 459         if (dev) {
 460                 psy = dev_get_drvdata(dev);
 461                 atomic_inc(&psy->use_cnt);
 462         }
 463
 464         return psy;
 465 }
 466 EXPORT_SYMBOL_GPL(power_supply_get_by_name);
 467
 468 /**
 469  * power_supply_put() - Drop reference obtained with power_supply_get_by_name
 470  * @psy: Reference to put
 471  *
 472  * The reference to power supply should be put before unregistering
 473  * the power supply.
 474  */
 475 void power_supply_put(struct power_supply *psy)
 476 {
 477         might_sleep();
 478
 479         atomic_dec(&psy->use_cnt);
 480         put_device(&psy->dev);
 481 }
 482 EXPORT_SYMBOL_GPL(power_supply_put);
 483
 484 #ifdef CONFIG_OF
 485 static int power_supply_match_device_node(struct device *dev, const void *data)
 486 {
 487         return dev->parent && dev->parent->of_node == data;
 488 }
 489
 490 /**
 491  * power_supply_get_by_phandle() - Search for a power supply and returns its ref
 492  * @np: Pointer to device node holding phandle property
 493  * @property: Name of property holding a power supply name
 494  *
 495  * If power supply was found, it increases reference count for the
 496  * internal power supply's device. The user should power_supply_put()
 497  * after usage.
 498  *
 499  * Return: On success returns a reference to a power supply with
 500  * matching name equals to value under @property, NULL or ERR_PTR otherwise.
 501  */
 502 struct power_supply *power_supply_get_by_phandle(struct device_node *np,
 503                                                         const char *property)
 504 {
 505         struct device_node *power_supply_np;
 506         struct power_supply *psy = NULL;
 507         struct device *dev;
 508
 509         power_supply_np = of_parse_phandle(np, property, 0);
 510         if (!power_supply_np)
 511                 return ERR_PTR(-ENODEV);
 512
 513         dev = class_find_device(power_supply_class, NULL, power_supply_np,
 514                                                 power_supply_match_device_node);
 515
 516         of_node_put(power_supply_np);
 517
 518         if (dev) {
 519                 psy = dev_get_drvdata(dev);
 520                 atomic_inc(&psy->use_cnt);
 521         }
 522
 523         return psy;
 524 }
 525 EXPORT_SYMBOL_GPL(power_supply_get_by_phandle);
 526
 527 static void devm_power_supply_put(struct device *dev, void *res)
 528 {
 529         struct power_supply **psy = res;
 530
 531         power_supply_put(*psy);
 532 }
 533
 534 /**
 535  * devm_power_supply_get_by_phandle() - Resource managed version of
 536  *  power_supply_get_by_phandle()
 537  * @dev: Pointer to device holding phandle property
 538  * @property: Name of property holding a power supply phandle
 539  *
 540  * Return: On success returns a reference to a power supply with
 541  * matching name equals to value under @property, NULL or ERR_PTR otherwise.
 542  */
 543 struct power_supply *devm_power_supply_get_by_phandle(struct device *dev,
 544                                                       const char *property)
 545 {
 546         struct power_supply **ptr, *psy;
 547
 548         if (!dev->of_node)
 549                 return ERR_PTR(-ENODEV);
 550
 551         ptr = devres_alloc(devm_power_supply_put, sizeof(*ptr), GFP_KERNEL);
 552         if (!ptr)
 553                 return ERR_PTR(-ENOMEM);
 554
 555         psy = power_supply_get_by_phandle(dev->of_node, property);
 556         if (IS_ERR_OR_NULL(psy)) {
 557                 devres_free(ptr);
 558         } else {
 559                 *ptr = psy;
 560                 devres_add(dev, ptr);
 561         }
 562         return psy;
 563 }
 564 EXPORT_SYMBOL_GPL(devm_power_supply_get_by_phandle);
 565 #endif /* CONFIG_OF */
 566
 567 int power_supply_get_battery_info(struct power_supply *psy,
 568                                   struct power_supply_battery_info *info)
 569 {
 570         struct device_node *battery_np;
 571         const char *value;
 572         int err;
 573
 574         info->energy_full_design_uwh         = -EINVAL;
 575         info->charge_full_design_uah         = -EINVAL;
 576         info->voltage_min_design_uv          = -EINVAL;
 577         info->precharge_current_ua           = -EINVAL;
 578         info->charge_term_current_ua         = -EINVAL;
 579         info->constant_charge_current_max_ua = -EINVAL;
 580         info->constant_charge_voltage_max_uv = -EINVAL;
 581
 582         if (!psy->of_node) {
 583                 dev_warn(&psy->dev, "%s currently only supports devicetree\n",
 584                          __func__);
 585                 return -ENXIO;
 586         }
 587
 588         battery_np = of_parse_phandle(psy->of_node, "monitored-battery", 0);
 589         if (!battery_np)
 590                 return -ENODEV;
 591
 592         err = of_property_read_string(battery_np, "compatible", &value);
 593         if (err)
 594                 return err;
 595
 596         if (strcmp("simple-battery", value))
 597                 return -ENODEV;
 598
 599         /* The property and field names below must correspond to elements
 600          * in enum power_supply_property. For reasoning, see
 601          * Documentation/power/power_supply_class.txt.
 602          */
 603
 604         of_property_read_u32(battery_np, "energy-full-design-microwatt-hours",
 605                              &info->energy_full_design_uwh);
 606         of_property_read_u32(battery_np, "charge-full-design-microamp-hours",
 607                              &info->charge_full_design_uah);
 608         of_property_read_u32(battery_np, "voltage-min-design-microvolt",
 609                              &info->voltage_min_design_uv);
 610         of_property_read_u32(battery_np, "precharge-current-microamp",
 611                              &info->precharge_current_ua);
 612         of_property_read_u32(battery_np, "charge-term-current-microamp",
 613                              &info->charge_term_current_ua);
 614         of_property_read_u32(battery_np, "constant_charge_current_max_microamp",
 615                              &info->constant_charge_current_max_ua);
 616         of_property_read_u32(battery_np, "constant_charge_voltage_max_microvolt",
 617                              &info->constant_charge_voltage_max_uv);
 618
 619         return 0;
 620 }
 621 EXPORT_SYMBOL_GPL(power_supply_get_battery_info);
 622
 623 int power_supply_get_property(struct power_supply *psy,
 624                             enum power_supply_property psp,
 625                             union power_supply_propval *val)
 626 {
 627         if (atomic_read(&psy->use_cnt) <= 0) {
 628                 if (!psy->initialized)
 629                         return -EAGAIN;
 630                 return -ENODEV;
 631         }
 632
 633         return psy->desc->get_property(psy, psp, val);
 634 }
 635 EXPORT_SYMBOL_GPL(power_supply_get_property);
 636
 637 int power_supply_set_property(struct power_supply *psy,
 638                             enum power_supply_property psp,
 639                             const union power_supply_propval *val)
 640 {
 641         if (atomic_read(&psy->use_cnt) <= 0 || !psy->desc->set_property)
 642                 return -ENODEV;
 643
 644         return psy->desc->set_property(psy, psp, val);
 645 }
 646 EXPORT_SYMBOL_GPL(power_supply_set_property);
 647
 648 int power_supply_property_is_writeable(struct power_supply *psy,
 649                                         enum power_supply_property psp)
 650 {
 651         if (atomic_read(&psy->use_cnt) <= 0 ||
 652                         !psy->desc->property_is_writeable)
 653                 return -ENODEV;
 654
 655         return psy->desc->property_is_writeable(psy, psp);
 656 }
 657 EXPORT_SYMBOL_GPL(power_supply_property_is_writeable);
 658
 659 void power_supply_external_power_changed(struct power_supply *psy)
 660 {
 661         if (atomic_read(&psy->use_cnt) <= 0 ||
 662                         !psy->desc->external_power_changed)
 663                 return;
 664
 665         psy->desc->external_power_changed(psy);
 666 }
 667 EXPORT_SYMBOL_GPL(power_supply_external_power_changed);
 668
 669 int power_supply_powers(struct power_supply *psy, struct device *dev)
 670 {
 671         return sysfs_create_link(&psy->dev.kobj, &dev->kobj, "powers");
 672 }
 673 EXPORT_SYMBOL_GPL(power_supply_powers);
 674
 675 static void power_supply_dev_release(struct device *dev)
 676 {
 677         struct power_supply *psy = container_of(dev, struct power_supply, dev);
 678         pr_debug("device: '%s': %s\n", dev_name(dev), __func__);
 679         kfree(psy);
 680 }
 681
 682 int power_supply_reg_notifier(struct notifier_block *nb)
 683 {
 684         return atomic_notifier_chain_register(&power_supply_notifier, nb);
 685 }
 686 EXPORT_SYMBOL_GPL(power_supply_reg_notifier);
 687
 688 void power_supply_unreg_notifier(struct notifier_block *nb)
 689 {
 690         atomic_notifier_chain_unregister(&power_supply_notifier, nb);
 691 }
 692 EXPORT_SYMBOL_GPL(power_supply_unreg_notifier);
 693
 694 #ifdef CONFIG_THERMAL
 695 static int power_supply_read_temp(struct thermal_zone_device *tzd,
 696                 int *temp)
 697 {
 698         struct power_supply *psy;
 699         union power_supply_propval val;
 700         int ret;
 701
 702         WARN_ON(tzd == NULL);
 703         psy = tzd->devdata;
 704         ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_TEMP, &val);
 705         if (ret)
 706                 return ret;
 707
 708         /* Convert tenths of degree Celsius to milli degree Celsius. */
 709         *temp = val.intval * 100;
 710
 711         return ret;
 712 }
 713
 714 static struct thermal_zone_device_ops psy_tzd_ops = {
 715         .get_temp = power_supply_read_temp,
 716 };
 717
 718 static int psy_register_thermal(struct power_supply *psy)
 719 {
 720         int i;
 721
 722         if (psy->desc->no_thermal)
 723                 return 0;
 724
 725         /* Register battery zone device psy reports temperature */
 726         for (i = 0; i < psy->desc->num_properties; i++) {
 727                 if (psy->desc->properties[i] == POWER_SUPPLY_PROP_TEMP) {
 728                         psy->tzd = thermal_zone_device_register(psy->desc->name,
 729                                         0, 0, psy, &psy_tzd_ops, NULL, 0, 0);
 730                         return PTR_ERR_OR_ZERO(psy->tzd);
 731                 }
 732         }
 733         return 0;
 734 }
 735
 736 static void psy_unregister_thermal(struct power_supply *psy)
 737 {
 738         if (IS_ERR_OR_NULL(psy->tzd))
 739                 return;
 740         thermal_zone_device_unregister(psy->tzd);
 741 }
 742
 743 /* thermal cooling device callbacks */
 744 static int ps_get_max_charge_cntl_limit(struct thermal_cooling_device *tcd,
 745                                         unsigned long *state)
 746 {
 747         struct power_supply *psy;
 748         union power_supply_propval val;
 749         int ret;
 750
 751         psy = tcd->devdata;
 752         ret = power_supply_get_property(psy,
 753                         POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT_MAX, &val);
 754         if (ret)
 755                 return ret;
 756
 757         *state = val.intval;
 758
 759         return ret;
 760 }
 761
 762 static int ps_get_cur_chrage_cntl_limit(struct thermal_cooling_device *tcd,
 763                                         unsigned long *state)
 764 {
 765         struct power_supply *psy;
 766         union power_supply_propval val;
 767         int ret;
 768
 769         psy = tcd->devdata;
 770         ret = power_supply_get_property(psy,
 771                         POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT, &val);
 772         if (ret)
 773                 return ret;
 774
 775         *state = val.intval;
 776
 777         return ret;
 778 }
 779
 780 static int ps_set_cur_charge_cntl_limit(struct thermal_cooling_device *tcd,
 781                                         unsigned long state)
 782 {
 783         struct power_supply *psy;
 784         union power_supply_propval val;
 785         int ret;
 786
 787         psy = tcd->devdata;
 788         val.intval = state;
 789         ret = psy->desc->set_property(psy,
 790                 POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT, &val);
 791
 792         return ret;
 793 }
 794
 795 static const struct thermal_cooling_device_ops psy_tcd_ops = {
 796         .get_max_state = ps_get_max_charge_cntl_limit,
 797         .get_cur_state = ps_get_cur_chrage_cntl_limit,
 798         .set_cur_state = ps_set_cur_charge_cntl_limit,
 799 };
 800
 801 static int psy_register_cooler(struct power_supply *psy)
 802 {
 803         int i;
 804
 805         /* Register for cooling device if psy can control charging */
 806         for (i = 0; i < psy->desc->num_properties; i++) {
 807                 if (psy->desc->properties[i] ==
 808                                 POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT) {
 809                         psy->tcd = thermal_cooling_device_register(
 810                                                         (char *)psy->desc->name,
 811                                                         psy, &psy_tcd_ops);
 812                         return PTR_ERR_OR_ZERO(psy->tcd);
 813                 }
 814         }
 815         return 0;
 816 }
 817
 818 static void psy_unregister_cooler(struct power_supply *psy)
 819 {
 820         if (IS_ERR_OR_NULL(psy->tcd))
 821                 return;
 822         thermal_cooling_device_unregister(psy->tcd);
 823 }
 824 #else
 825 static int psy_register_thermal(struct power_supply *psy)
 826 {
 827         return 0;
 828 }
 829
 830 static void psy_unregister_thermal(struct power_supply *psy)
 831 {
 832 }
 833
 834 static int psy_register_cooler(struct power_supply *psy)
 835 {
 836         return 0;
 837 }
 838
 839 static void psy_unregister_cooler(struct power_supply *psy)
 840 {
 841 }
 842 #endif
 843
 844 static struct power_supply *__must_check
 845 __power_supply_register(struct device *parent,
 846                                    const struct power_supply_desc *desc,
 847                                    const struct power_supply_config *cfg,
 848                                    bool ws)
 849 {
 850         struct device *dev;
 851         struct power_supply *psy;
 852         int rc;
 853
 854         if (!parent)
 855                 pr_warn("%s: Expected proper parent device for '%s'\n",
 856                         __func__, desc->name);
 857
 858         psy = kzalloc(sizeof(*psy), GFP_KERNEL);
 859         if (!psy)
 860                 return ERR_PTR(-ENOMEM);
 861
 862         dev = &psy->dev;
 863
 864         device_initialize(dev);
 865
 866         dev->class = power_supply_class;
 867         dev->type = &power_supply_dev_type;
 868         dev->parent = parent;
 869         dev->release = power_supply_dev_release;
 870         dev_set_drvdata(dev, psy);
 871         psy->desc = desc;
 872         if (cfg) {
 873                 psy->drv_data = cfg->drv_data;
 874                 psy->of_node = cfg->of_node;
 875                 psy->supplied_to = cfg->supplied_to;
 876                 psy->num_supplicants = cfg->num_supplicants;
 877         }
 878
 879         rc = dev_set_name(dev, "%s", desc->name);
 880         if (rc)
 881                 goto dev_set_name_failed;
 882
 883         INIT_WORK(&psy->changed_work, power_supply_changed_work);
 884         INIT_DELAYED_WORK(&psy->deferred_register_work,
 885                           power_supply_deferred_register_work);
 886
 887         rc = power_supply_check_supplies(psy);
 888         if (rc) {
 889                 dev_info(dev, "Not all required supplies found, defer probe\n");
 890                 goto check_supplies_failed;
 891         }
 892
 893         spin_lock_init(&psy->changed_lock);
 894         rc = device_add(dev);
 895         if (rc)
 896                 goto device_add_failed;
 897
 898         rc = device_init_wakeup(dev, ws);
 899         if (rc)
 900                 goto wakeup_init_failed;
 901
 902         rc = psy_register_thermal(psy);
 903         if (rc)
 904                 goto register_thermal_failed;
 905
 906         rc = psy_register_cooler(psy);
 907         if (rc)
 908                 goto register_cooler_failed;
 909
 910         rc = power_supply_create_triggers(psy);
 911         if (rc)
 912                 goto create_triggers_failed;
 913
 914         /*
 915          * Update use_cnt after any uevents (most notably from device_add()).
 916          * We are here still during driver's probe but
 917          * the power_supply_uevent() calls back driver's get_property
 918          * method so:
 919          * 1. Driver did not assigned the returned struct power_supply,
 920          * 2. Driver could not finish initialization (anything in its probe
 921          *    after calling power_supply_register()).
 922          */
 923         atomic_inc(&psy->use_cnt);
 924         psy->initialized = true;
 925
 926         queue_delayed_work(system_power_efficient_wq,
 927                            &psy->deferred_register_work,
 928                            POWER_SUPPLY_DEFERRED_REGISTER_TIME);
 929
 930         return psy;
 931
 932 create_triggers_failed:
 933         psy_unregister_cooler(psy);
 934 register_cooler_failed:
 935         psy_unregister_thermal(psy);
 936 register_thermal_failed:
 937         device_del(dev);
 938 wakeup_init_failed:
 939 device_add_failed:
 940 check_supplies_failed:
 941 dev_set_name_failed:
 942         put_device(dev);
 943         return ERR_PTR(rc);
 944 }
 945
 946 /**
 947  * power_supply_register() - Register new power supply
 948  * @parent:     Device to be a parent of power supply's device, usually
 949  *              the device which probe function calls this
 950  * @desc:       Description of power supply, must be valid through whole
 951  *              lifetime of this power supply
 952  * @cfg:        Run-time specific configuration accessed during registering,
 953  *              may be NULL
 954  *
 955  * Return: A pointer to newly allocated power_supply on success
 956  * or ERR_PTR otherwise.
 957  * Use power_supply_unregister() on returned power_supply pointer to release
 958  * resources.
 959  */
 960 struct power_supply *__must_check power_supply_register(struct device *parent,
 961                 const struct power_supply_desc *desc,
 962                 const struct power_supply_config *cfg)
 963 {
 964         return __power_supply_register(parent, desc, cfg, true);
 965 }
 966 EXPORT_SYMBOL_GPL(power_supply_register);
 967
 968 /**
 969  * power_supply_register_no_ws() - Register new non-waking-source power supply
 970  * @parent:     Device to be a parent of power supply's device, usually
 971  *              the device which probe function calls this
 972  * @desc:       Description of power supply, must be valid through whole
 973  *              lifetime of this power supply
 974  * @cfg:        Run-time specific configuration accessed during registering,
 975  *              may be NULL
 976  *
 977  * Return: A pointer to newly allocated power_supply on success
 978  * or ERR_PTR otherwise.
 979  * Use power_supply_unregister() on returned power_supply pointer to release
 980  * resources.
 981  */
 982 struct power_supply *__must_check
 983 power_supply_register_no_ws(struct device *parent,
 984                 const struct power_supply_desc *desc,
 985                 const struct power_supply_config *cfg)
 986 {
 987         return __power_supply_register(parent, desc, cfg, false);
 988 }
 989 EXPORT_SYMBOL_GPL(power_supply_register_no_ws);
 990
 991 static void devm_power_supply_release(struct device *dev, void *res)
 992 {
 993         struct power_supply **psy = res;
 994
 995         power_supply_unregister(*psy);
 996 }
 997
 998 /**
 999  * devm_power_supply_register() - Register managed power supply
1000  * @parent:     Device to be a parent of power supply's device, usually
1001  *              the device which probe function calls this
1002  * @desc:       Description of power supply, must be valid through whole
1003  *              lifetime of this power supply
1004  * @cfg:        Run-time specific configuration accessed during registering,
1005  *              may be NULL
1006  *
1007  * Return: A pointer to newly allocated power_supply on success
1008  * or ERR_PTR otherwise.
1009  * The returned power_supply pointer will be automatically unregistered
1010  * on driver detach.
1011  */
1012 struct power_supply *__must_check
1013 devm_power_supply_register(struct device *parent,
1014                 const struct power_supply_desc *desc,
1015                 const struct power_supply_config *cfg)
1016 {
1017         struct power_supply **ptr, *psy;
1018
1019         ptr = devres_alloc(devm_power_supply_release, sizeof(*ptr), GFP_KERNEL);
1020
1021         if (!ptr)
1022                 return ERR_PTR(-ENOMEM);
1023         psy = __power_supply_register(parent, desc, cfg, true);
1024         if (IS_ERR(psy)) {
1025                 devres_free(ptr);
1026         } else {
1027                 *ptr = psy;
1028                 devres_add(parent, ptr);
1029         }
1030         return psy;
1031 }
1032 EXPORT_SYMBOL_GPL(devm_power_supply_register);
1033
1034 /**
1035  * devm_power_supply_register_no_ws() - Register managed non-waking-source power supply
1036  * @parent:     Device to be a parent of power supply's device, usually
1037  *              the device which probe function calls this
1038  * @desc:       Description of power supply, must be valid through whole
1039  *              lifetime of this power supply
1040  * @cfg:        Run-time specific configuration accessed during registering,
1041  *              may be NULL
1042  *
1043  * Return: A pointer to newly allocated power_supply on success
1044  * or ERR_PTR otherwise.
1045  * The returned power_supply pointer will be automatically unregistered
1046  * on driver detach.
1047  */
1048 struct power_supply *__must_check
1049 devm_power_supply_register_no_ws(struct device *parent,
1050                 const struct power_supply_desc *desc,
1051                 const struct power_supply_config *cfg)
1052 {
1053         struct power_supply **ptr, *psy;
1054
1055         ptr = devres_alloc(devm_power_supply_release, sizeof(*ptr), GFP_KERNEL);
1056
1057         if (!ptr)
1058                 return ERR_PTR(-ENOMEM);
1059         psy = __power_supply_register(parent, desc, cfg, false);
1060         if (IS_ERR(psy)) {
1061                 devres_free(ptr);
1062         } else {
1063                 *ptr = psy;
1064                 devres_add(parent, ptr);
1065         }
1066         return psy;
1067 }
1068 EXPORT_SYMBOL_GPL(devm_power_supply_register_no_ws);
1069
1070 /**
1071  * power_supply_unregister() - Remove this power supply from system
1072  * @psy:        Pointer to power supply to unregister
1073  *
1074  * Remove this power supply from the system. The resources of power supply
1075  * will be freed here or on last power_supply_put() call.
1076  */
1077 void power_supply_unregister(struct power_supply *psy)
1078 {
1079         WARN_ON(atomic_dec_return(&psy->use_cnt));
1080         psy->removing = true;
1081         cancel_work_sync(&psy->changed_work);
1082         cancel_delayed_work_sync(&psy->deferred_register_work);
1083         sysfs_remove_link(&psy->dev.kobj, "powers");
1084         power_supply_remove_triggers(psy);
1085         psy_unregister_cooler(psy);
1086         psy_unregister_thermal(psy);
1087         device_init_wakeup(&psy->dev, false);
1088         device_unregister(&psy->dev);
1089 }
1090 EXPORT_SYMBOL_GPL(power_supply_unregister);
1091
1092 void *power_supply_get_drvdata(struct power_supply *psy)
1093 {
1094         return psy->drv_data;
1095 }
1096 EXPORT_SYMBOL_GPL(power_supply_get_drvdata);
1097
1098 static int __init power_supply_class_init(void)
1099 {
1100         power_supply_class = class_create(THIS_MODULE, "power_supply");
1101
1102         if (IS_ERR(power_supply_class))
1103                 return PTR_ERR(power_supply_class);
1104
1105         power_supply_class->dev_uevent = power_supply_uevent;
1106         power_supply_init_attrs(&power_supply_dev_type);
1107
1108         return 0;
1109 }
1110
1111 static void __exit power_supply_class_exit(void)
1112 {
1113         class_destroy(power_supply_class);
1114 }
1115
1116 subsys_initcall(power_supply_class_init);
1117 module_exit(power_supply_class_exit);
1118
1119 MODULE_DESCRIPTION("Universal power supply monitor class");
1120 MODULE_AUTHOR("Ian Molton <spyro@f2s.com>, "
1121               "Szabolcs Gyurko, "
1122               "Anton Vorontsov <cbou@mail.ru>");
1123 MODULE_LICENSE("GPL");