linux/drivers/power/supply/power_supply_core.c
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   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 *  Universal power supply monitor class
   4 *
   5 *  Copyright © 2007  Anton Vorontsov <cbou@mail.ru>
   6 *  Copyright © 2004  Szabolcs Gyurko
   7 *  Copyright © 2003  Ian Molton <spyro@f2s.com>
   8 *
   9 *  Modified: 2004, Oct     Szabolcs Gyurko
  10 */
  11
  12#include <linux/module.h>
  13#include <linux/types.h>
  14#include <linux/init.h>
  15#include <linux/slab.h>
  16#include <linux/delay.h>
  17#include <linux/device.h>
  18#include <linux/notifier.h>
  19#include <linux/err.h>
  20#include <linux/of.h>
  21#include <linux/power_supply.h>
  22#include <linux/property.h>
  23#include <linux/thermal.h>
  24#include "power_supply.h"
  25
  26/* exported for the APM Power driver, APM emulation */
  27struct class *power_supply_class;
  28EXPORT_SYMBOL_GPL(power_supply_class);
  29
  30ATOMIC_NOTIFIER_HEAD(power_supply_notifier);
  31EXPORT_SYMBOL_GPL(power_supply_notifier);
  32
  33static struct device_type power_supply_dev_type;
  34
  35#define POWER_SUPPLY_DEFERRED_REGISTER_TIME     msecs_to_jiffies(10)
  36
  37static 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
  63static 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
  76static 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
 114void 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}
 126EXPORT_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 */
 138static 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
 158static int __power_supply_populate_supplied_from(struct device *dev,
 159                                                 void *data)
 160{
 161        struct power_supply *psy = data;
 162        struct power_supply *epsy = dev_get_drvdata(dev);
 163        struct device_node *np;
 164        int i = 0;
 165
 166        do {
 167                np = of_parse_phandle(psy->of_node, "power-supplies", i++);
 168                if (!np)
 169                        break;
 170
 171                if (np == epsy->of_node) {
 172                        dev_info(&psy->dev, "%s: Found supply : %s\n",
 173                                psy->desc->name, epsy->desc->name);
 174                        psy->supplied_from[i-1] = (char *)epsy->desc->name;
 175                        psy->num_supplies++;
 176                        of_node_put(np);
 177                        break;
 178                }
 179                of_node_put(np);
 180        } while (np);
 181
 182        return 0;
 183}
 184
 185static int power_supply_populate_supplied_from(struct power_supply *psy)
 186{
 187        int error;
 188
 189        error = class_for_each_device(power_supply_class, NULL, psy,
 190                                      __power_supply_populate_supplied_from);
 191
 192        dev_dbg(&psy->dev, "%s %d\n", __func__, error);
 193
 194        return error;
 195}
 196
 197static int  __power_supply_find_supply_from_node(struct device *dev,
 198                                                 void *data)
 199{
 200        struct device_node *np = data;
 201        struct power_supply *epsy = dev_get_drvdata(dev);
 202
 203        /* returning non-zero breaks out of class_for_each_device loop */
 204        if (epsy->of_node == np)
 205                return 1;
 206
 207        return 0;
 208}
 209
 210static int power_supply_find_supply_from_node(struct device_node *supply_node)
 211{
 212        int error;
 213
 214        /*
 215         * class_for_each_device() either returns its own errors or values
 216         * returned by __power_supply_find_supply_from_node().
 217         *
 218         * __power_supply_find_supply_from_node() will return 0 (no match)
 219         * or 1 (match).
 220         *
 221         * We return 0 if class_for_each_device() returned 1, -EPROBE_DEFER if
 222         * it returned 0, or error as returned by it.
 223         */
 224        error = class_for_each_device(power_supply_class, NULL, supply_node,
 225                                       __power_supply_find_supply_from_node);
 226
 227        return error ? (error == 1 ? 0 : error) : -EPROBE_DEFER;
 228}
 229
 230static int power_supply_check_supplies(struct power_supply *psy)
 231{
 232        struct device_node *np;
 233        int cnt = 0;
 234
 235        /* If there is already a list honor it */
 236        if (psy->supplied_from && psy->num_supplies > 0)
 237                return 0;
 238
 239        /* No device node found, nothing to do */
 240        if (!psy->of_node)
 241                return 0;
 242
 243        do {
 244                int ret;
 245
 246                np = of_parse_phandle(psy->of_node, "power-supplies", cnt++);
 247                if (!np)
 248                        break;
 249
 250                ret = power_supply_find_supply_from_node(np);
 251                of_node_put(np);
 252
 253                if (ret) {
 254                        dev_dbg(&psy->dev, "Failed to find supply!\n");
 255                        return ret;
 256                }
 257        } while (np);
 258
 259        /* Missing valid "power-supplies" entries */
 260        if (cnt == 1)
 261                return 0;
 262
 263        /* All supplies found, allocate char ** array for filling */
 264        psy->supplied_from = devm_kzalloc(&psy->dev, sizeof(psy->supplied_from),
 265                                          GFP_KERNEL);
 266        if (!psy->supplied_from)
 267                return -ENOMEM;
 268
 269        *psy->supplied_from = devm_kcalloc(&psy->dev,
 270                                           cnt - 1, sizeof(char *),
 271                                           GFP_KERNEL);
 272        if (!*psy->supplied_from)
 273                return -ENOMEM;
 274
 275        return power_supply_populate_supplied_from(psy);
 276}
 277#else
 278static int power_supply_check_supplies(struct power_supply *psy)
 279{
 280        int nval, ret;
 281
 282        if (!psy->dev.parent)
 283                return 0;
 284
 285        nval = device_property_read_string_array(psy->dev.parent,
 286                                                 "supplied-from", NULL, 0);
 287        if (nval <= 0)
 288                return 0;
 289
 290        psy->supplied_from = devm_kmalloc_array(&psy->dev, nval,
 291                                                sizeof(char *), GFP_KERNEL);
 292        if (!psy->supplied_from)
 293                return -ENOMEM;
 294
 295        ret = device_property_read_string_array(psy->dev.parent,
 296                "supplied-from", (const char **)psy->supplied_from, nval);
 297        if (ret < 0)
 298                return ret;
 299
 300        psy->num_supplies = nval;
 301
 302        return 0;
 303}
 304#endif
 305
 306struct psy_am_i_supplied_data {
 307        struct power_supply *psy;
 308        unsigned int count;
 309};
 310
 311static int __power_supply_am_i_supplied(struct device *dev, void *_data)
 312{
 313        union power_supply_propval ret = {0,};
 314        struct power_supply *epsy = dev_get_drvdata(dev);
 315        struct psy_am_i_supplied_data *data = _data;
 316
 317        if (__power_supply_is_supplied_by(epsy, data->psy)) {
 318                data->count++;
 319                if (!epsy->desc->get_property(epsy, POWER_SUPPLY_PROP_ONLINE,
 320                                        &ret))
 321                        return ret.intval;
 322        }
 323
 324        return 0;
 325}
 326
 327int power_supply_am_i_supplied(struct power_supply *psy)
 328{
 329        struct psy_am_i_supplied_data data = { psy, 0 };
 330        int error;
 331
 332        error = class_for_each_device(power_supply_class, NULL, &data,
 333                                      __power_supply_am_i_supplied);
 334
 335        dev_dbg(&psy->dev, "%s count %u err %d\n", __func__, data.count, error);
 336
 337        if (data.count == 0)
 338                return -ENODEV;
 339
 340        return error;
 341}
 342EXPORT_SYMBOL_GPL(power_supply_am_i_supplied);
 343
 344static int __power_supply_is_system_supplied(struct device *dev, void *data)
 345{
 346        union power_supply_propval ret = {0,};
 347        struct power_supply *psy = dev_get_drvdata(dev);
 348        unsigned int *count = data;
 349
 350        (*count)++;
 351        if (psy->desc->type != POWER_SUPPLY_TYPE_BATTERY)
 352                if (!psy->desc->get_property(psy, POWER_SUPPLY_PROP_ONLINE,
 353                                        &ret))
 354                        return ret.intval;
 355
 356        return 0;
 357}
 358
 359int power_supply_is_system_supplied(void)
 360{
 361        int error;
 362        unsigned int count = 0;
 363
 364        error = class_for_each_device(power_supply_class, NULL, &count,
 365                                      __power_supply_is_system_supplied);
 366
 367        /*
 368         * If no power class device was found at all, most probably we are
 369         * running on a desktop system, so assume we are on mains power.
 370         */
 371        if (count == 0)
 372                return 1;
 373
 374        return error;
 375}
 376EXPORT_SYMBOL_GPL(power_supply_is_system_supplied);
 377
 378static int __power_supply_get_supplier_max_current(struct device *dev,
 379                                                   void *data)
 380{
 381        union power_supply_propval ret = {0,};
 382        struct power_supply *epsy = dev_get_drvdata(dev);
 383        struct power_supply *psy = data;
 384
 385        if (__power_supply_is_supplied_by(epsy, psy))
 386                if (!epsy->desc->get_property(epsy,
 387                                              POWER_SUPPLY_PROP_CURRENT_MAX,
 388                                              &ret))
 389                        return ret.intval;
 390
 391        return 0;
 392}
 393
 394int power_supply_set_input_current_limit_from_supplier(struct power_supply *psy)
 395{
 396        union power_supply_propval val = {0,};
 397        int curr;
 398
 399        if (!psy->desc->set_property)
 400                return -EINVAL;
 401
 402        /*
 403         * This function is not intended for use with a supply with multiple
 404         * suppliers, we simply pick the first supply to report a non 0
 405         * max-current.
 406         */
 407        curr = class_for_each_device(power_supply_class, NULL, psy,
 408                                      __power_supply_get_supplier_max_current);
 409        if (curr <= 0)
 410                return (curr == 0) ? -ENODEV : curr;
 411
 412        val.intval = curr;
 413
 414        return psy->desc->set_property(psy,
 415                                POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT, &val);
 416}
 417EXPORT_SYMBOL_GPL(power_supply_set_input_current_limit_from_supplier);
 418
 419int power_supply_set_battery_charged(struct power_supply *psy)
 420{
 421        if (atomic_read(&psy->use_cnt) >= 0 &&
 422                        psy->desc->type == POWER_SUPPLY_TYPE_BATTERY &&
 423                        psy->desc->set_charged) {
 424                psy->desc->set_charged(psy);
 425                return 0;
 426        }
 427
 428        return -EINVAL;
 429}
 430EXPORT_SYMBOL_GPL(power_supply_set_battery_charged);
 431
 432static int power_supply_match_device_by_name(struct device *dev, const void *data)
 433{
 434        const char *name = data;
 435        struct power_supply *psy = dev_get_drvdata(dev);
 436
 437        return strcmp(psy->desc->name, name) == 0;
 438}
 439
 440/**
 441 * power_supply_get_by_name() - Search for a power supply and returns its ref
 442 * @name: Power supply name to fetch
 443 *
 444 * If power supply was found, it increases reference count for the
 445 * internal power supply's device. The user should power_supply_put()
 446 * after usage.
 447 *
 448 * Return: On success returns a reference to a power supply with
 449 * matching name equals to @name, a NULL otherwise.
 450 */
 451struct power_supply *power_supply_get_by_name(const char *name)
 452{
 453        struct power_supply *psy = NULL;
 454        struct device *dev = class_find_device(power_supply_class, NULL, name,
 455                                        power_supply_match_device_by_name);
 456
 457        if (dev) {
 458                psy = dev_get_drvdata(dev);
 459                atomic_inc(&psy->use_cnt);
 460        }
 461
 462        return psy;
 463}
 464EXPORT_SYMBOL_GPL(power_supply_get_by_name);
 465
 466/**
 467 * power_supply_put() - Drop reference obtained with power_supply_get_by_name
 468 * @psy: Reference to put
 469 *
 470 * The reference to power supply should be put before unregistering
 471 * the power supply.
 472 */
 473void power_supply_put(struct power_supply *psy)
 474{
 475        might_sleep();
 476
 477        atomic_dec(&psy->use_cnt);
 478        put_device(&psy->dev);
 479}
 480EXPORT_SYMBOL_GPL(power_supply_put);
 481
 482#ifdef CONFIG_OF
 483static int power_supply_match_device_node(struct device *dev, const void *data)
 484{
 485        return dev->parent && dev->parent->of_node == data;
 486}
 487
 488/**
 489 * power_supply_get_by_phandle() - Search for a power supply and returns its ref
 490 * @np: Pointer to device node holding phandle property
 491 * @property: Name of property holding a power supply name
 492 *
 493 * If power supply was found, it increases reference count for the
 494 * internal power supply's device. The user should power_supply_put()
 495 * after usage.
 496 *
 497 * Return: On success returns a reference to a power supply with
 498 * matching name equals to value under @property, NULL or ERR_PTR otherwise.
 499 */
 500struct power_supply *power_supply_get_by_phandle(struct device_node *np,
 501                                                        const char *property)
 502{
 503        struct device_node *power_supply_np;
 504        struct power_supply *psy = NULL;
 505        struct device *dev;
 506
 507        power_supply_np = of_parse_phandle(np, property, 0);
 508        if (!power_supply_np)
 509                return ERR_PTR(-ENODEV);
 510
 511        dev = class_find_device(power_supply_class, NULL, power_supply_np,
 512                                                power_supply_match_device_node);
 513
 514        of_node_put(power_supply_np);
 515
 516        if (dev) {
 517                psy = dev_get_drvdata(dev);
 518                atomic_inc(&psy->use_cnt);
 519        }
 520
 521        return psy;
 522}
 523EXPORT_SYMBOL_GPL(power_supply_get_by_phandle);
 524
 525static void devm_power_supply_put(struct device *dev, void *res)
 526{
 527        struct power_supply **psy = res;
 528
 529        power_supply_put(*psy);
 530}
 531
 532/**
 533 * devm_power_supply_get_by_phandle() - Resource managed version of
 534 *  power_supply_get_by_phandle()
 535 * @dev: Pointer to device holding phandle property
 536 * @property: Name of property holding a power supply phandle
 537 *
 538 * Return: On success returns a reference to a power supply with
 539 * matching name equals to value under @property, NULL or ERR_PTR otherwise.
 540 */
 541struct power_supply *devm_power_supply_get_by_phandle(struct device *dev,
 542                                                      const char *property)
 543{
 544        struct power_supply **ptr, *psy;
 545
 546        if (!dev->of_node)
 547                return ERR_PTR(-ENODEV);
 548
 549        ptr = devres_alloc(devm_power_supply_put, sizeof(*ptr), GFP_KERNEL);
 550        if (!ptr)
 551                return ERR_PTR(-ENOMEM);
 552
 553        psy = power_supply_get_by_phandle(dev->of_node, property);
 554        if (IS_ERR_OR_NULL(psy)) {
 555                devres_free(ptr);
 556        } else {
 557                *ptr = psy;
 558                devres_add(dev, ptr);
 559        }
 560        return psy;
 561}
 562EXPORT_SYMBOL_GPL(devm_power_supply_get_by_phandle);
 563#endif /* CONFIG_OF */
 564
 565int power_supply_get_battery_info(struct power_supply *psy,
 566                                  struct power_supply_battery_info *info)
 567{
 568        struct power_supply_resistance_temp_table *resist_table;
 569        struct device_node *battery_np;
 570        const char *value;
 571        int err, len, index;
 572        const __be32 *list;
 573
 574        info->energy_full_design_uwh         = -EINVAL;
 575        info->charge_full_design_uah         = -EINVAL;
 576        info->voltage_min_design_uv          = -EINVAL;
 577        info->voltage_max_design_uv          = -EINVAL;
 578        info->precharge_current_ua           = -EINVAL;
 579        info->charge_term_current_ua         = -EINVAL;
 580        info->constant_charge_current_max_ua = -EINVAL;
 581        info->constant_charge_voltage_max_uv = -EINVAL;
 582        info->factory_internal_resistance_uohm  = -EINVAL;
 583        info->resist_table = NULL;
 584
 585        for (index = 0; index < POWER_SUPPLY_OCV_TEMP_MAX; index++) {
 586                info->ocv_table[index]       = NULL;
 587                info->ocv_temp[index]        = -EINVAL;
 588                info->ocv_table_size[index]  = -EINVAL;
 589        }
 590
 591        if (!psy->of_node) {
 592                dev_warn(&psy->dev, "%s currently only supports devicetree\n",
 593                         __func__);
 594                return -ENXIO;
 595        }
 596
 597        battery_np = of_parse_phandle(psy->of_node, "monitored-battery", 0);
 598        if (!battery_np)
 599                return -ENODEV;
 600
 601        err = of_property_read_string(battery_np, "compatible", &value);
 602        if (err)
 603                goto out_put_node;
 604
 605        if (strcmp("simple-battery", value)) {
 606                err = -ENODEV;
 607                goto out_put_node;
 608        }
 609
 610        /* The property and field names below must correspond to elements
 611         * in enum power_supply_property. For reasoning, see
 612         * Documentation/power/power_supply_class.rst.
 613         */
 614
 615        of_property_read_u32(battery_np, "energy-full-design-microwatt-hours",
 616                             &info->energy_full_design_uwh);
 617        of_property_read_u32(battery_np, "charge-full-design-microamp-hours",
 618                             &info->charge_full_design_uah);
 619        of_property_read_u32(battery_np, "voltage-min-design-microvolt",
 620                             &info->voltage_min_design_uv);
 621        of_property_read_u32(battery_np, "voltage-max-design-microvolt",
 622                             &info->voltage_max_design_uv);
 623        of_property_read_u32(battery_np, "trickle-charge-current-microamp",
 624                             &info->tricklecharge_current_ua);
 625        of_property_read_u32(battery_np, "precharge-current-microamp",
 626                             &info->precharge_current_ua);
 627        of_property_read_u32(battery_np, "precharge-upper-limit-microvolt",
 628                             &info->precharge_voltage_max_uv);
 629        of_property_read_u32(battery_np, "charge-term-current-microamp",
 630                             &info->charge_term_current_ua);
 631        of_property_read_u32(battery_np, "re-charge-voltage-microvolt",
 632                             &info->charge_restart_voltage_uv);
 633        of_property_read_u32(battery_np, "over-voltage-threshold-microvolt",
 634                             &info->overvoltage_limit_uv);
 635        of_property_read_u32(battery_np, "constant-charge-current-max-microamp",
 636                             &info->constant_charge_current_max_ua);
 637        of_property_read_u32(battery_np, "constant-charge-voltage-max-microvolt",
 638                             &info->constant_charge_voltage_max_uv);
 639        of_property_read_u32(battery_np, "factory-internal-resistance-micro-ohms",
 640                             &info->factory_internal_resistance_uohm);
 641
 642        len = of_property_count_u32_elems(battery_np, "ocv-capacity-celsius");
 643        if (len < 0 && len != -EINVAL) {
 644                err = len;
 645                goto out_put_node;
 646        } else if (len > POWER_SUPPLY_OCV_TEMP_MAX) {
 647                dev_err(&psy->dev, "Too many temperature values\n");
 648                err = -EINVAL;
 649                goto out_put_node;
 650        } else if (len > 0) {
 651                of_property_read_u32_array(battery_np, "ocv-capacity-celsius",
 652                                           info->ocv_temp, len);
 653        }
 654
 655        for (index = 0; index < len; index++) {
 656                struct power_supply_battery_ocv_table *table;
 657                char *propname;
 658                int i, tab_len, size;
 659
 660                propname = kasprintf(GFP_KERNEL, "ocv-capacity-table-%d", index);
 661                list = of_get_property(battery_np, propname, &size);
 662                if (!list || !size) {
 663                        dev_err(&psy->dev, "failed to get %s\n", propname);
 664                        kfree(propname);
 665                        power_supply_put_battery_info(psy, info);
 666                        err = -EINVAL;
 667                        goto out_put_node;
 668                }
 669
 670                kfree(propname);
 671                tab_len = size / (2 * sizeof(__be32));
 672                info->ocv_table_size[index] = tab_len;
 673
 674                table = info->ocv_table[index] =
 675                        devm_kcalloc(&psy->dev, tab_len, sizeof(*table), GFP_KERNEL);
 676                if (!info->ocv_table[index]) {
 677                        power_supply_put_battery_info(psy, info);
 678                        err = -ENOMEM;
 679                        goto out_put_node;
 680                }
 681
 682                for (i = 0; i < tab_len; i++) {
 683                        table[i].ocv = be32_to_cpu(*list);
 684                        list++;
 685                        table[i].capacity = be32_to_cpu(*list);
 686                        list++;
 687                }
 688        }
 689
 690        list = of_get_property(battery_np, "resistance-temp-table", &len);
 691        if (!list || !len)
 692                goto out_put_node;
 693
 694        info->resist_table_size = len / (2 * sizeof(__be32));
 695        resist_table = info->resist_table = devm_kcalloc(&psy->dev,
 696                                                         info->resist_table_size,
 697                                                         sizeof(*resist_table),
 698                                                         GFP_KERNEL);
 699        if (!info->resist_table) {
 700                power_supply_put_battery_info(psy, info);
 701                err = -ENOMEM;
 702                goto out_put_node;
 703        }
 704
 705        for (index = 0; index < info->resist_table_size; index++) {
 706                resist_table[index].temp = be32_to_cpu(*list++);
 707                resist_table[index].resistance = be32_to_cpu(*list++);
 708        }
 709
 710out_put_node:
 711        of_node_put(battery_np);
 712        return err;
 713}
 714EXPORT_SYMBOL_GPL(power_supply_get_battery_info);
 715
 716void power_supply_put_battery_info(struct power_supply *psy,
 717                                   struct power_supply_battery_info *info)
 718{
 719        int i;
 720
 721        for (i = 0; i < POWER_SUPPLY_OCV_TEMP_MAX; i++) {
 722                if (info->ocv_table[i])
 723                        devm_kfree(&psy->dev, info->ocv_table[i]);
 724        }
 725
 726        if (info->resist_table)
 727                devm_kfree(&psy->dev, info->resist_table);
 728}
 729EXPORT_SYMBOL_GPL(power_supply_put_battery_info);
 730
 731/**
 732 * power_supply_temp2resist_simple() - find the battery internal resistance
 733 * percent
 734 * @table: Pointer to battery resistance temperature table
 735 * @table_len: The table length
 736 * @temp: Current temperature
 737 *
 738 * This helper function is used to look up battery internal resistance percent
 739 * according to current temperature value from the resistance temperature table,
 740 * and the table must be ordered descending. Then the actual battery internal
 741 * resistance = the ideal battery internal resistance * percent / 100.
 742 *
 743 * Return: the battery internal resistance percent
 744 */
 745int power_supply_temp2resist_simple(struct power_supply_resistance_temp_table *table,
 746                                    int table_len, int temp)
 747{
 748        int i, resist;
 749
 750        for (i = 0; i < table_len; i++)
 751                if (temp > table[i].temp)
 752                        break;
 753
 754        if (i > 0 && i < table_len) {
 755                int tmp;
 756
 757                tmp = (table[i - 1].resistance - table[i].resistance) *
 758                        (temp - table[i].temp);
 759                tmp /= table[i - 1].temp - table[i].temp;
 760                resist = tmp + table[i].resistance;
 761        } else if (i == 0) {
 762                resist = table[0].resistance;
 763        } else {
 764                resist = table[table_len - 1].resistance;
 765        }
 766
 767        return resist;
 768}
 769EXPORT_SYMBOL_GPL(power_supply_temp2resist_simple);
 770
 771/**
 772 * power_supply_ocv2cap_simple() - find the battery capacity
 773 * @table: Pointer to battery OCV lookup table
 774 * @table_len: OCV table length
 775 * @ocv: Current OCV value
 776 *
 777 * This helper function is used to look up battery capacity according to
 778 * current OCV value from one OCV table, and the OCV table must be ordered
 779 * descending.
 780 *
 781 * Return: the battery capacity.
 782 */
 783int power_supply_ocv2cap_simple(struct power_supply_battery_ocv_table *table,
 784                                int table_len, int ocv)
 785{
 786        int i, cap, tmp;
 787
 788        for (i = 0; i < table_len; i++)
 789                if (ocv > table[i].ocv)
 790                        break;
 791
 792        if (i > 0 && i < table_len) {
 793                tmp = (table[i - 1].capacity - table[i].capacity) *
 794                        (ocv - table[i].ocv);
 795                tmp /= table[i - 1].ocv - table[i].ocv;
 796                cap = tmp + table[i].capacity;
 797        } else if (i == 0) {
 798                cap = table[0].capacity;
 799        } else {
 800                cap = table[table_len - 1].capacity;
 801        }
 802
 803        return cap;
 804}
 805EXPORT_SYMBOL_GPL(power_supply_ocv2cap_simple);
 806
 807struct power_supply_battery_ocv_table *
 808power_supply_find_ocv2cap_table(struct power_supply_battery_info *info,
 809                                int temp, int *table_len)
 810{
 811        int best_temp_diff = INT_MAX, temp_diff;
 812        u8 i, best_index = 0;
 813
 814        if (!info->ocv_table[0])
 815                return NULL;
 816
 817        for (i = 0; i < POWER_SUPPLY_OCV_TEMP_MAX; i++) {
 818                temp_diff = abs(info->ocv_temp[i] - temp);
 819
 820                if (temp_diff < best_temp_diff) {
 821                        best_temp_diff = temp_diff;
 822                        best_index = i;
 823                }
 824        }
 825
 826        *table_len = info->ocv_table_size[best_index];
 827        return info->ocv_table[best_index];
 828}
 829EXPORT_SYMBOL_GPL(power_supply_find_ocv2cap_table);
 830
 831int power_supply_batinfo_ocv2cap(struct power_supply_battery_info *info,
 832                                 int ocv, int temp)
 833{
 834        struct power_supply_battery_ocv_table *table;
 835        int table_len;
 836
 837        table = power_supply_find_ocv2cap_table(info, temp, &table_len);
 838        if (!table)
 839                return -EINVAL;
 840
 841        return power_supply_ocv2cap_simple(table, table_len, ocv);
 842}
 843EXPORT_SYMBOL_GPL(power_supply_batinfo_ocv2cap);
 844
 845int power_supply_get_property(struct power_supply *psy,
 846                            enum power_supply_property psp,
 847                            union power_supply_propval *val)
 848{
 849        if (atomic_read(&psy->use_cnt) <= 0) {
 850                if (!psy->initialized)
 851                        return -EAGAIN;
 852                return -ENODEV;
 853        }
 854
 855        return psy->desc->get_property(psy, psp, val);
 856}
 857EXPORT_SYMBOL_GPL(power_supply_get_property);
 858
 859int power_supply_set_property(struct power_supply *psy,
 860                            enum power_supply_property psp,
 861                            const union power_supply_propval *val)
 862{
 863        if (atomic_read(&psy->use_cnt) <= 0 || !psy->desc->set_property)
 864                return -ENODEV;
 865
 866        return psy->desc->set_property(psy, psp, val);
 867}
 868EXPORT_SYMBOL_GPL(power_supply_set_property);
 869
 870int power_supply_property_is_writeable(struct power_supply *psy,
 871                                        enum power_supply_property psp)
 872{
 873        if (atomic_read(&psy->use_cnt) <= 0 ||
 874                        !psy->desc->property_is_writeable)
 875                return -ENODEV;
 876
 877        return psy->desc->property_is_writeable(psy, psp);
 878}
 879EXPORT_SYMBOL_GPL(power_supply_property_is_writeable);
 880
 881void power_supply_external_power_changed(struct power_supply *psy)
 882{
 883        if (atomic_read(&psy->use_cnt) <= 0 ||
 884                        !psy->desc->external_power_changed)
 885                return;
 886
 887        psy->desc->external_power_changed(psy);
 888}
 889EXPORT_SYMBOL_GPL(power_supply_external_power_changed);
 890
 891int power_supply_powers(struct power_supply *psy, struct device *dev)
 892{
 893        return sysfs_create_link(&psy->dev.kobj, &dev->kobj, "powers");
 894}
 895EXPORT_SYMBOL_GPL(power_supply_powers);
 896
 897static void power_supply_dev_release(struct device *dev)
 898{
 899        struct power_supply *psy = to_power_supply(dev);
 900        dev_dbg(dev, "%s\n", __func__);
 901        kfree(psy);
 902}
 903
 904int power_supply_reg_notifier(struct notifier_block *nb)
 905{
 906        return atomic_notifier_chain_register(&power_supply_notifier, nb);
 907}
 908EXPORT_SYMBOL_GPL(power_supply_reg_notifier);
 909
 910void power_supply_unreg_notifier(struct notifier_block *nb)
 911{
 912        atomic_notifier_chain_unregister(&power_supply_notifier, nb);
 913}
 914EXPORT_SYMBOL_GPL(power_supply_unreg_notifier);
 915
 916#ifdef CONFIG_THERMAL
 917static int power_supply_read_temp(struct thermal_zone_device *tzd,
 918                int *temp)
 919{
 920        struct power_supply *psy;
 921        union power_supply_propval val;
 922        int ret;
 923
 924        WARN_ON(tzd == NULL);
 925        psy = tzd->devdata;
 926        ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_TEMP, &val);
 927        if (ret)
 928                return ret;
 929
 930        /* Convert tenths of degree Celsius to milli degree Celsius. */
 931        *temp = val.intval * 100;
 932
 933        return ret;
 934}
 935
 936static struct thermal_zone_device_ops psy_tzd_ops = {
 937        .get_temp = power_supply_read_temp,
 938};
 939
 940static int psy_register_thermal(struct power_supply *psy)
 941{
 942        int i, ret;
 943
 944        if (psy->desc->no_thermal)
 945                return 0;
 946
 947        /* Register battery zone device psy reports temperature */
 948        for (i = 0; i < psy->desc->num_properties; i++) {
 949                if (psy->desc->properties[i] == POWER_SUPPLY_PROP_TEMP) {
 950                        psy->tzd = thermal_zone_device_register(psy->desc->name,
 951                                        0, 0, psy, &psy_tzd_ops, NULL, 0, 0);
 952                        if (IS_ERR(psy->tzd))
 953                                return PTR_ERR(psy->tzd);
 954                        ret = thermal_zone_device_enable(psy->tzd);
 955                        if (ret)
 956                                thermal_zone_device_unregister(psy->tzd);
 957                        return ret;
 958                }
 959        }
 960        return 0;
 961}
 962
 963static void psy_unregister_thermal(struct power_supply *psy)
 964{
 965        if (IS_ERR_OR_NULL(psy->tzd))
 966                return;
 967        thermal_zone_device_unregister(psy->tzd);
 968}
 969
 970/* thermal cooling device callbacks */
 971static int ps_get_max_charge_cntl_limit(struct thermal_cooling_device *tcd,
 972                                        unsigned long *state)
 973{
 974        struct power_supply *psy;
 975        union power_supply_propval val;
 976        int ret;
 977
 978        psy = tcd->devdata;
 979        ret = power_supply_get_property(psy,
 980                        POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT_MAX, &val);
 981        if (ret)
 982                return ret;
 983
 984        *state = val.intval;
 985
 986        return ret;
 987}
 988
 989static int ps_get_cur_charge_cntl_limit(struct thermal_cooling_device *tcd,
 990                                        unsigned long *state)
 991{
 992        struct power_supply *psy;
 993        union power_supply_propval val;
 994        int ret;
 995
 996        psy = tcd->devdata;
 997        ret = power_supply_get_property(psy,
 998                        POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT, &val);
 999        if (ret)
1000                return ret;
1001
1002        *state = val.intval;
1003
1004        return ret;
1005}
1006
1007static int ps_set_cur_charge_cntl_limit(struct thermal_cooling_device *tcd,
1008                                        unsigned long state)
1009{
1010        struct power_supply *psy;
1011        union power_supply_propval val;
1012        int ret;
1013
1014        psy = tcd->devdata;
1015        val.intval = state;
1016        ret = psy->desc->set_property(psy,
1017                POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT, &val);
1018
1019        return ret;
1020}
1021
1022static const struct thermal_cooling_device_ops psy_tcd_ops = {
1023        .get_max_state = ps_get_max_charge_cntl_limit,
1024        .get_cur_state = ps_get_cur_charge_cntl_limit,
1025        .set_cur_state = ps_set_cur_charge_cntl_limit,
1026};
1027
1028static int psy_register_cooler(struct power_supply *psy)
1029{
1030        int i;
1031
1032        /* Register for cooling device if psy can control charging */
1033        for (i = 0; i < psy->desc->num_properties; i++) {
1034                if (psy->desc->properties[i] ==
1035                                POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT) {
1036                        psy->tcd = thermal_cooling_device_register(
1037                                                        (char *)psy->desc->name,
1038                                                        psy, &psy_tcd_ops);
1039                        return PTR_ERR_OR_ZERO(psy->tcd);
1040                }
1041        }
1042        return 0;
1043}
1044
1045static void psy_unregister_cooler(struct power_supply *psy)
1046{
1047        if (IS_ERR_OR_NULL(psy->tcd))
1048                return;
1049        thermal_cooling_device_unregister(psy->tcd);
1050}
1051#else
1052static int psy_register_thermal(struct power_supply *psy)
1053{
1054        return 0;
1055}
1056
1057static void psy_unregister_thermal(struct power_supply *psy)
1058{
1059}
1060
1061static int psy_register_cooler(struct power_supply *psy)
1062{
1063        return 0;
1064}
1065
1066static void psy_unregister_cooler(struct power_supply *psy)
1067{
1068}
1069#endif
1070
1071static struct power_supply *__must_check
1072__power_supply_register(struct device *parent,
1073                                   const struct power_supply_desc *desc,
1074                                   const struct power_supply_config *cfg,
1075                                   bool ws)
1076{
1077        struct device *dev;
1078        struct power_supply *psy;
1079        int i, rc;
1080
1081        if (!parent)
1082                pr_warn("%s: Expected proper parent device for '%s'\n",
1083                        __func__, desc->name);
1084
1085        if (!desc || !desc->name || !desc->properties || !desc->num_properties)
1086                return ERR_PTR(-EINVAL);
1087
1088        for (i = 0; i < desc->num_properties; ++i) {
1089                if ((desc->properties[i] == POWER_SUPPLY_PROP_USB_TYPE) &&
1090                    (!desc->usb_types || !desc->num_usb_types))
1091                        return ERR_PTR(-EINVAL);
1092        }
1093
1094        psy = kzalloc(sizeof(*psy), GFP_KERNEL);
1095        if (!psy)
1096                return ERR_PTR(-ENOMEM);
1097
1098        dev = &psy->dev;
1099
1100        device_initialize(dev);
1101
1102        dev->class = power_supply_class;
1103        dev->type = &power_supply_dev_type;
1104        dev->parent = parent;
1105        dev->release = power_supply_dev_release;
1106        dev_set_drvdata(dev, psy);
1107        psy->desc = desc;
1108        if (cfg) {
1109                dev->groups = cfg->attr_grp;
1110                psy->drv_data = cfg->drv_data;
1111                psy->of_node =
1112                        cfg->fwnode ? to_of_node(cfg->fwnode) : cfg->of_node;
1113                psy->supplied_to = cfg->supplied_to;
1114                psy->num_supplicants = cfg->num_supplicants;
1115        }
1116
1117        rc = dev_set_name(dev, "%s", desc->name);
1118        if (rc)
1119                goto dev_set_name_failed;
1120
1121        INIT_WORK(&psy->changed_work, power_supply_changed_work);
1122        INIT_DELAYED_WORK(&psy->deferred_register_work,
1123                          power_supply_deferred_register_work);
1124
1125        rc = power_supply_check_supplies(psy);
1126        if (rc) {
1127                dev_info(dev, "Not all required supplies found, defer probe\n");
1128                goto check_supplies_failed;
1129        }
1130
1131        spin_lock_init(&psy->changed_lock);
1132        rc = device_add(dev);
1133        if (rc)
1134                goto device_add_failed;
1135
1136        rc = device_init_wakeup(dev, ws);
1137        if (rc)
1138                goto wakeup_init_failed;
1139
1140        rc = psy_register_thermal(psy);
1141        if (rc)
1142                goto register_thermal_failed;
1143
1144        rc = psy_register_cooler(psy);
1145        if (rc)
1146                goto register_cooler_failed;
1147
1148        rc = power_supply_create_triggers(psy);
1149        if (rc)
1150                goto create_triggers_failed;
1151
1152        rc = power_supply_add_hwmon_sysfs(psy);
1153        if (rc)
1154                goto add_hwmon_sysfs_failed;
1155
1156        /*
1157         * Update use_cnt after any uevents (most notably from device_add()).
1158         * We are here still during driver's probe but
1159         * the power_supply_uevent() calls back driver's get_property
1160         * method so:
1161         * 1. Driver did not assigned the returned struct power_supply,
1162         * 2. Driver could not finish initialization (anything in its probe
1163         *    after calling power_supply_register()).
1164         */
1165        atomic_inc(&psy->use_cnt);
1166        psy->initialized = true;
1167
1168        queue_delayed_work(system_power_efficient_wq,
1169                           &psy->deferred_register_work,
1170                           POWER_SUPPLY_DEFERRED_REGISTER_TIME);
1171
1172        return psy;
1173
1174add_hwmon_sysfs_failed:
1175        power_supply_remove_triggers(psy);
1176create_triggers_failed:
1177        psy_unregister_cooler(psy);
1178register_cooler_failed:
1179        psy_unregister_thermal(psy);
1180register_thermal_failed:
1181        device_del(dev);
1182wakeup_init_failed:
1183device_add_failed:
1184check_supplies_failed:
1185dev_set_name_failed:
1186        put_device(dev);
1187        return ERR_PTR(rc);
1188}
1189
1190/**
1191 * power_supply_register() - Register new power supply
1192 * @parent:     Device to be a parent of power supply's device, usually
1193 *              the device which probe function calls this
1194 * @desc:       Description of power supply, must be valid through whole
1195 *              lifetime of this power supply
1196 * @cfg:        Run-time specific configuration accessed during registering,
1197 *              may be NULL
1198 *
1199 * Return: A pointer to newly allocated power_supply on success
1200 * or ERR_PTR otherwise.
1201 * Use power_supply_unregister() on returned power_supply pointer to release
1202 * resources.
1203 */
1204struct power_supply *__must_check power_supply_register(struct device *parent,
1205                const struct power_supply_desc *desc,
1206                const struct power_supply_config *cfg)
1207{
1208        return __power_supply_register(parent, desc, cfg, true);
1209}
1210EXPORT_SYMBOL_GPL(power_supply_register);
1211
1212/**
1213 * power_supply_register_no_ws() - Register new non-waking-source power supply
1214 * @parent:     Device to be a parent of power supply's device, usually
1215 *              the device which probe function calls this
1216 * @desc:       Description of power supply, must be valid through whole
1217 *              lifetime of this power supply
1218 * @cfg:        Run-time specific configuration accessed during registering,
1219 *              may be NULL
1220 *
1221 * Return: A pointer to newly allocated power_supply on success
1222 * or ERR_PTR otherwise.
1223 * Use power_supply_unregister() on returned power_supply pointer to release
1224 * resources.
1225 */
1226struct power_supply *__must_check
1227power_supply_register_no_ws(struct device *parent,
1228                const struct power_supply_desc *desc,
1229                const struct power_supply_config *cfg)
1230{
1231        return __power_supply_register(parent, desc, cfg, false);
1232}
1233EXPORT_SYMBOL_GPL(power_supply_register_no_ws);
1234
1235static void devm_power_supply_release(struct device *dev, void *res)
1236{
1237        struct power_supply **psy = res;
1238
1239        power_supply_unregister(*psy);
1240}
1241
1242/**
1243 * devm_power_supply_register() - Register managed power supply
1244 * @parent:     Device to be a parent of power supply's device, usually
1245 *              the device which probe function calls this
1246 * @desc:       Description of power supply, must be valid through whole
1247 *              lifetime of this power supply
1248 * @cfg:        Run-time specific configuration accessed during registering,
1249 *              may be NULL
1250 *
1251 * Return: A pointer to newly allocated power_supply on success
1252 * or ERR_PTR otherwise.
1253 * The returned power_supply pointer will be automatically unregistered
1254 * on driver detach.
1255 */
1256struct power_supply *__must_check
1257devm_power_supply_register(struct device *parent,
1258                const struct power_supply_desc *desc,
1259                const struct power_supply_config *cfg)
1260{
1261        struct power_supply **ptr, *psy;
1262
1263        ptr = devres_alloc(devm_power_supply_release, sizeof(*ptr), GFP_KERNEL);
1264
1265        if (!ptr)
1266                return ERR_PTR(-ENOMEM);
1267        psy = __power_supply_register(parent, desc, cfg, true);
1268        if (IS_ERR(psy)) {
1269                devres_free(ptr);
1270        } else {
1271                *ptr = psy;
1272                devres_add(parent, ptr);
1273        }
1274        return psy;
1275}
1276EXPORT_SYMBOL_GPL(devm_power_supply_register);
1277
1278/**
1279 * devm_power_supply_register_no_ws() - Register managed non-waking-source power supply
1280 * @parent:     Device to be a parent of power supply's device, usually
1281 *              the device which probe function calls this
1282 * @desc:       Description of power supply, must be valid through whole
1283 *              lifetime of this power supply
1284 * @cfg:        Run-time specific configuration accessed during registering,
1285 *              may be NULL
1286 *
1287 * Return: A pointer to newly allocated power_supply on success
1288 * or ERR_PTR otherwise.
1289 * The returned power_supply pointer will be automatically unregistered
1290 * on driver detach.
1291 */
1292struct power_supply *__must_check
1293devm_power_supply_register_no_ws(struct device *parent,
1294                const struct power_supply_desc *desc,
1295                const struct power_supply_config *cfg)
1296{
1297        struct power_supply **ptr, *psy;
1298
1299        ptr = devres_alloc(devm_power_supply_release, sizeof(*ptr), GFP_KERNEL);
1300
1301        if (!ptr)
1302                return ERR_PTR(-ENOMEM);
1303        psy = __power_supply_register(parent, desc, cfg, false);
1304        if (IS_ERR(psy)) {
1305                devres_free(ptr);
1306        } else {
1307                *ptr = psy;
1308                devres_add(parent, ptr);
1309        }
1310        return psy;
1311}
1312EXPORT_SYMBOL_GPL(devm_power_supply_register_no_ws);
1313
1314/**
1315 * power_supply_unregister() - Remove this power supply from system
1316 * @psy:        Pointer to power supply to unregister
1317 *
1318 * Remove this power supply from the system. The resources of power supply
1319 * will be freed here or on last power_supply_put() call.
1320 */
1321void power_supply_unregister(struct power_supply *psy)
1322{
1323        WARN_ON(atomic_dec_return(&psy->use_cnt));
1324        psy->removing = true;
1325        cancel_work_sync(&psy->changed_work);
1326        cancel_delayed_work_sync(&psy->deferred_register_work);
1327        sysfs_remove_link(&psy->dev.kobj, "powers");
1328        power_supply_remove_hwmon_sysfs(psy);
1329        power_supply_remove_triggers(psy);
1330        psy_unregister_cooler(psy);
1331        psy_unregister_thermal(psy);
1332        device_init_wakeup(&psy->dev, false);
1333        device_unregister(&psy->dev);
1334}
1335EXPORT_SYMBOL_GPL(power_supply_unregister);
1336
1337void *power_supply_get_drvdata(struct power_supply *psy)
1338{
1339        return psy->drv_data;
1340}
1341EXPORT_SYMBOL_GPL(power_supply_get_drvdata);
1342
1343static int __init power_supply_class_init(void)
1344{
1345        power_supply_class = class_create(THIS_MODULE, "power_supply");
1346
1347        if (IS_ERR(power_supply_class))
1348                return PTR_ERR(power_supply_class);
1349
1350        power_supply_class->dev_uevent = power_supply_uevent;
1351        power_supply_init_attrs(&power_supply_dev_type);
1352
1353        return 0;
1354}
1355
1356static void __exit power_supply_class_exit(void)
1357{
1358        class_destroy(power_supply_class);
1359}
1360
1361subsys_initcall(power_supply_class_init);
1362module_exit(power_supply_class_exit);
1363
1364MODULE_DESCRIPTION("Universal power supply monitor class");
1365MODULE_AUTHOR("Ian Molton <spyro@f2s.com>, "
1366              "Szabolcs Gyurko, "
1367              "Anton Vorontsov <cbou@mail.ru>");
1368MODULE_LICENSE("GPL");
1369