drivers/power/charger-manager.c

   1 /*
   2  * Copyright (C) 2011 Samsung Electronics Co., Ltd.
   3  * MyungJoo Ham <myungjoo.ham@samsung.com>
   4  *
   5  * This driver enables to monitor battery health and control charger
   6  * during suspend-to-mem.
   7  * Charger manager depends on other devices. register this later than
   8  * the depending devices.
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13 **/
  14
  15 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  16
  17 #include <linux/io.h>
  18 #include <linux/module.h>
  19 #include <linux/irq.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/rtc.h>
  22 #include <linux/slab.h>
  23 #include <linux/workqueue.h>
  24 #include <linux/platform_device.h>
  25 #include <linux/power/charger-manager.h>
  26 #include <linux/regulator/consumer.h>
  27 #include <linux/sysfs.h>
  28 #include <linux/of.h>
  29 #include <linux/thermal.h>
  30
  31 /*
  32  * Default termperature threshold for charging.
  33  * Every temperature units are in tenth of centigrade.
  34  */
  35 #define CM_DEFAULT_RECHARGE_TEMP_DIFF   50
  36 #define CM_DEFAULT_CHARGE_TEMP_MAX      500
  37
  38 static const char * const default_event_names[] = {
  39         [CM_EVENT_UNKNOWN] = "Unknown",
  40         [CM_EVENT_BATT_FULL] = "Battery Full",
  41         [CM_EVENT_BATT_IN] = "Battery Inserted",
  42         [CM_EVENT_BATT_OUT] = "Battery Pulled Out",
  43         [CM_EVENT_BATT_OVERHEAT] = "Battery Overheat",
  44         [CM_EVENT_BATT_COLD] = "Battery Cold",
  45         [CM_EVENT_EXT_PWR_IN_OUT] = "External Power Attach/Detach",
  46         [CM_EVENT_CHG_START_STOP] = "Charging Start/Stop",
  47         [CM_EVENT_OTHERS] = "Other battery events"
  48 };
  49
  50 /*
  51  * Regard CM_JIFFIES_SMALL jiffies is small enough to ignore for
  52  * delayed works so that we can run delayed works with CM_JIFFIES_SMALL
  53  * without any delays.
  54  */
  55 #define CM_JIFFIES_SMALL        (2)
  56
  57 /* If y is valid (> 0) and smaller than x, do x = y */
  58 #define CM_MIN_VALID(x, y)      x = (((y > 0) && ((x) > (y))) ? (y) : (x))
  59
  60 /*
  61  * Regard CM_RTC_SMALL (sec) is small enough to ignore error in invoking
  62  * rtc alarm. It should be 2 or larger
  63  */
  64 #define CM_RTC_SMALL            (2)
  65
  66 #define UEVENT_BUF_SIZE         32
  67
  68 static LIST_HEAD(cm_list);
  69 static DEFINE_MUTEX(cm_list_mtx);
  70
  71 /* About in-suspend (suspend-again) monitoring */
  72 static struct rtc_device *rtc_dev;
  73 /*
  74  * Backup RTC alarm
  75  * Save the wakeup alarm before entering suspend-to-RAM
  76  */
  77 static struct rtc_wkalrm rtc_wkalarm_save;
  78 /* Backup RTC alarm time in terms of seconds since 01-01-1970 00:00:00 */
  79 static unsigned long rtc_wkalarm_save_time;
  80 static bool cm_suspended;
  81 static bool cm_rtc_set;
  82 static unsigned long cm_suspend_duration_ms;
  83
  84 /* About normal (not suspended) monitoring */
  85 static unsigned long polling_jiffy = ULONG_MAX; /* ULONG_MAX: no polling */
  86 static unsigned long next_polling; /* Next appointed polling time */
  87 static struct workqueue_struct *cm_wq; /* init at driver add */
  88 static struct delayed_work cm_monitor_work; /* init at driver add */
  89
  90 /* Global charger-manager description */
  91 static struct charger_global_desc *g_desc; /* init with setup_charger_manager */
  92
  93 /**
  94  * is_batt_present - See if the battery presents in place.
  95  * @cm: the Charger Manager representing the battery.
  96  */
  97 static bool is_batt_present(struct charger_manager *cm)
  98 {
  99         union power_supply_propval val;
 100         struct power_supply *psy;
 101         bool present = false;
 102         int i, ret;
 103
 104         switch (cm->desc->battery_present) {
 105         case CM_BATTERY_PRESENT:
 106                 present = true;
 107                 break;
 108         case CM_NO_BATTERY:
 109                 break;
 110         case CM_FUEL_GAUGE:
 111                 psy = power_supply_get_by_name(cm->desc->psy_fuel_gauge);
 112                 if (!psy)
 113                         break;
 114
 115                 ret = psy->get_property(psy,
 116                                 POWER_SUPPLY_PROP_PRESENT, &val);
 117                 if (ret == 0 && val.intval)
 118                         present = true;
 119                 break;
 120         case CM_CHARGER_STAT:
 121                 for (i = 0; cm->desc->psy_charger_stat[i]; i++) {
 122                         psy = power_supply_get_by_name(
 123                                         cm->desc->psy_charger_stat[i]);
 124                         if (!psy) {
 125                                 dev_err(cm->dev, "Cannot find power supply \"%s\"\n",
 126                                         cm->desc->psy_charger_stat[i]);
 127                                 continue;
 128                         }
 129
 130                         ret = psy->get_property(psy, POWER_SUPPLY_PROP_PRESENT,
 131                                         &val);
 132                         if (ret == 0 && val.intval) {
 133                                 present = true;
 134                                 break;
 135                         }
 136                 }
 137                 break;
 138         }
 139
 140         return present;
 141 }
 142
 143 /**
 144  * is_ext_pwr_online - See if an external power source is attached to charge
 145  * @cm: the Charger Manager representing the battery.
 146  *
 147  * Returns true if at least one of the chargers of the battery has an external
 148  * power source attached to charge the battery regardless of whether it is
 149  * actually charging or not.
 150  */
 151 static bool is_ext_pwr_online(struct charger_manager *cm)
 152 {
 153         union power_supply_propval val;
 154         struct power_supply *psy;
 155         bool online = false;
 156         int i, ret;
 157
 158         /* If at least one of them has one, it's yes. */
 159         for (i = 0; cm->desc->psy_charger_stat[i]; i++) {
 160                 psy = power_supply_get_by_name(cm->desc->psy_charger_stat[i]);
 161                 if (!psy) {
 162                         dev_err(cm->dev, "Cannot find power supply \"%s\"\n",
 163                                         cm->desc->psy_charger_stat[i]);
 164                         continue;
 165                 }
 166
 167                 ret = psy->get_property(psy, POWER_SUPPLY_PROP_ONLINE, &val);
 168                 if (ret == 0 && val.intval) {
 169                         online = true;
 170                         break;
 171                 }
 172         }
 173
 174         return online;
 175 }
 176
 177 /**
 178  * get_batt_uV - Get the voltage level of the battery
 179  * @cm: the Charger Manager representing the battery.
 180  * @uV: the voltage level returned.
 181  *
 182  * Returns 0 if there is no error.
 183  * Returns a negative value on error.
 184  */
 185 static int get_batt_uV(struct charger_manager *cm, int *uV)
 186 {
 187         union power_supply_propval val;
 188         struct power_supply *fuel_gauge;
 189         int ret;
 190
 191         fuel_gauge = power_supply_get_by_name(cm->desc->psy_fuel_gauge);
 192         if (!fuel_gauge)
 193                 return -ENODEV;
 194
 195         ret = fuel_gauge->get_property(fuel_gauge,
 196                                 POWER_SUPPLY_PROP_VOLTAGE_NOW, &val);
 197         if (ret)
 198                 return ret;
 199
 200         *uV = val.intval;
 201         return 0;
 202 }
 203
 204 /**
 205  * is_charging - Returns true if the battery is being charged.
 206  * @cm: the Charger Manager representing the battery.
 207  */
 208 static bool is_charging(struct charger_manager *cm)
 209 {
 210         int i, ret;
 211         bool charging = false;
 212         struct power_supply *psy;
 213         union power_supply_propval val;
 214
 215         /* If there is no battery, it cannot be charged */
 216         if (!is_batt_present(cm))
 217                 return false;
 218
 219         /* If at least one of the charger is charging, return yes */
 220         for (i = 0; cm->desc->psy_charger_stat[i]; i++) {
 221                 /* 1. The charger sholuld not be DISABLED */
 222                 if (cm->emergency_stop)
 223                         continue;
 224                 if (!cm->charger_enabled)
 225                         continue;
 226
 227                 psy = power_supply_get_by_name(cm->desc->psy_charger_stat[i]);
 228                 if (!psy) {
 229                         dev_err(cm->dev, "Cannot find power supply \"%s\"\n",
 230                                         cm->desc->psy_charger_stat[i]);
 231                         continue;
 232                 }
 233
 234                 /* 2. The charger should be online (ext-power) */
 235                 ret = psy->get_property(psy, POWER_SUPPLY_PROP_ONLINE, &val);
 236                 if (ret) {
 237                         dev_warn(cm->dev, "Cannot read ONLINE value from %s\n",
 238                                  cm->desc->psy_charger_stat[i]);
 239                         continue;
 240                 }
 241                 if (val.intval == 0)
 242                         continue;
 243
 244                 /*
 245                  * 3. The charger should not be FULL, DISCHARGING,
 246                  * or NOT_CHARGING.
 247                  */
 248                 ret = psy->get_property(psy, POWER_SUPPLY_PROP_STATUS, &val);
 249                 if (ret) {
 250                         dev_warn(cm->dev, "Cannot read STATUS value from %s\n",
 251                                  cm->desc->psy_charger_stat[i]);
 252                         continue;
 253                 }
 254                 if (val.intval == POWER_SUPPLY_STATUS_FULL ||
 255                                 val.intval == POWER_SUPPLY_STATUS_DISCHARGING ||
 256                                 val.intval == POWER_SUPPLY_STATUS_NOT_CHARGING)
 257                         continue;
 258
 259                 /* Then, this is charging. */
 260                 charging = true;
 261                 break;
 262         }
 263
 264         return charging;
 265 }
 266
 267 /**
 268  * is_full_charged - Returns true if the battery is fully charged.
 269  * @cm: the Charger Manager representing the battery.
 270  */
 271 static bool is_full_charged(struct charger_manager *cm)
 272 {
 273         struct charger_desc *desc = cm->desc;
 274         union power_supply_propval val;
 275         struct power_supply *fuel_gauge;
 276         int ret = 0;
 277         int uV;
 278
 279         /* If there is no battery, it cannot be charged */
 280         if (!is_batt_present(cm))
 281                 return false;
 282
 283         fuel_gauge = power_supply_get_by_name(cm->desc->psy_fuel_gauge);
 284         if (!fuel_gauge)
 285                 return false;
 286
 287         if (desc->fullbatt_full_capacity > 0) {
 288                 val.intval = 0;
 289
 290                 /* Not full if capacity of fuel gauge isn't full */
 291                 ret = fuel_gauge->get_property(fuel_gauge,
 292                                 POWER_SUPPLY_PROP_CHARGE_FULL, &val);
 293                 if (!ret && val.intval > desc->fullbatt_full_capacity)
 294                         return true;
 295         }
 296
 297         /* Full, if it's over the fullbatt voltage */
 298         if (desc->fullbatt_uV > 0) {
 299                 ret = get_batt_uV(cm, &uV);
 300                 if (!ret && uV >= desc->fullbatt_uV)
 301                         return true;
 302         }
 303
 304         /* Full, if the capacity is more than fullbatt_soc */
 305         if (desc->fullbatt_soc > 0) {
 306                 val.intval = 0;
 307
 308                 ret = fuel_gauge->get_property(fuel_gauge,
 309                                 POWER_SUPPLY_PROP_CAPACITY, &val);
 310                 if (!ret && val.intval >= desc->fullbatt_soc)
 311                         return true;
 312         }
 313
 314         return false;
 315 }
 316
 317 /**
 318  * is_polling_required - Return true if need to continue polling for this CM.
 319  * @cm: the Charger Manager representing the battery.
 320  */
 321 static bool is_polling_required(struct charger_manager *cm)
 322 {
 323         switch (cm->desc->polling_mode) {
 324         case CM_POLL_DISABLE:
 325                 return false;
 326         case CM_POLL_ALWAYS:
 327                 return true;
 328         case CM_POLL_EXTERNAL_POWER_ONLY:
 329                 return is_ext_pwr_online(cm);
 330         case CM_POLL_CHARGING_ONLY:
 331                 return is_charging(cm);
 332         default:
 333                 dev_warn(cm->dev, "Incorrect polling_mode (%d)\n",
 334                          cm->desc->polling_mode);
 335         }
 336
 337         return false;
 338 }
 339
 340 /**
 341  * try_charger_enable - Enable/Disable chargers altogether
 342  * @cm: the Charger Manager representing the battery.
 343  * @enable: true: enable / false: disable
 344  *
 345  * Note that Charger Manager keeps the charger enabled regardless whether
 346  * the charger is charging or not (because battery is full or no external
 347  * power source exists) except when CM needs to disable chargers forcibly
 348  * bacause of emergency causes; when the battery is overheated or too cold.
 349  */
 350 static int try_charger_enable(struct charger_manager *cm, bool enable)
 351 {
 352         int err = 0, i;
 353         struct charger_desc *desc = cm->desc;
 354
 355         /* Ignore if it's redundent command */
 356         if (enable == cm->charger_enabled)
 357                 return 0;
 358
 359         if (enable) {
 360                 if (cm->emergency_stop)
 361                         return -EAGAIN;
 362
 363                 /*
 364                  * Save start time of charging to limit
 365                  * maximum possible charging time.
 366                  */
 367                 cm->charging_start_time = ktime_to_ms(ktime_get());
 368                 cm->charging_end_time = 0;
 369
 370                 for (i = 0 ; i < desc->num_charger_regulators ; i++) {
 371                         if (desc->charger_regulators[i].externally_control)
 372                                 continue;
 373
 374                         err = regulator_enable(desc->charger_regulators[i].consumer);
 375                         if (err < 0) {
 376                                 dev_warn(cm->dev, "Cannot enable %s regulator\n",
 377                                          desc->charger_regulators[i].regulator_name);
 378                         }
 379                 }
 380         } else {
 381                 /*
 382                  * Save end time of charging to maintain fully charged state
 383                  * of battery after full-batt.
 384                  */
 385                 cm->charging_start_time = 0;
 386                 cm->charging_end_time = ktime_to_ms(ktime_get());
 387
 388                 for (i = 0 ; i < desc->num_charger_regulators ; i++) {
 389                         if (desc->charger_regulators[i].externally_control)
 390                                 continue;
 391
 392                         err = regulator_disable(desc->charger_regulators[i].consumer);
 393                         if (err < 0) {
 394                                 dev_warn(cm->dev, "Cannot disable %s regulator\n",
 395                                          desc->charger_regulators[i].regulator_name);
 396                         }
 397                 }
 398
 399                 /*
 400                  * Abnormal battery state - Stop charging forcibly,
 401                  * even if charger was enabled at the other places
 402                  */
 403                 for (i = 0; i < desc->num_charger_regulators; i++) {
 404                         if (regulator_is_enabled(
 405                                     desc->charger_regulators[i].consumer)) {
 406                                 regulator_force_disable(
 407                                         desc->charger_regulators[i].consumer);
 408                                 dev_warn(cm->dev, "Disable regulator(%s) forcibly\n",
 409                                          desc->charger_regulators[i].regulator_name);
 410                         }
 411                 }
 412         }
 413
 414         if (!err)
 415                 cm->charger_enabled = enable;
 416
 417         return err;
 418 }
 419
 420 /**
 421  * try_charger_restart - Restart charging.
 422  * @cm: the Charger Manager representing the battery.
 423  *
 424  * Restart charging by turning off and on the charger.
 425  */
 426 static int try_charger_restart(struct charger_manager *cm)
 427 {
 428         int err;
 429
 430         if (cm->emergency_stop)
 431                 return -EAGAIN;
 432
 433         err = try_charger_enable(cm, false);
 434         if (err)
 435                 return err;
 436
 437         return try_charger_enable(cm, true);
 438 }
 439
 440 /**
 441  * uevent_notify - Let users know something has changed.
 442  * @cm: the Charger Manager representing the battery.
 443  * @event: the event string.
 444  *
 445  * If @event is null, it implies that uevent_notify is called
 446  * by resume function. When called in the resume function, cm_suspended
 447  * should be already reset to false in order to let uevent_notify
 448  * notify the recent event during the suspend to users. While
 449  * suspended, uevent_notify does not notify users, but tracks
 450  * events so that uevent_notify can notify users later after resumed.
 451  */
 452 static void uevent_notify(struct charger_manager *cm, const char *event)
 453 {
 454         static char env_str[UEVENT_BUF_SIZE + 1] = "";
 455         static char env_str_save[UEVENT_BUF_SIZE + 1] = "";
 456
 457         if (cm_suspended) {
 458                 /* Nothing in suspended-event buffer */
 459                 if (env_str_save[0] == 0) {
 460                         if (!strncmp(env_str, event, UEVENT_BUF_SIZE))
 461                                 return; /* status not changed */
 462                         strncpy(env_str_save, event, UEVENT_BUF_SIZE);
 463                         return;
 464                 }
 465
 466                 if (!strncmp(env_str_save, event, UEVENT_BUF_SIZE))
 467                         return; /* Duplicated. */
 468                 strncpy(env_str_save, event, UEVENT_BUF_SIZE);
 469                 return;
 470         }
 471
 472         if (event == NULL) {
 473                 /* No messages pending */
 474                 if (!env_str_save[0])
 475                         return;
 476
 477                 strncpy(env_str, env_str_save, UEVENT_BUF_SIZE);
 478                 kobject_uevent(&cm->dev->kobj, KOBJ_CHANGE);
 479                 env_str_save[0] = 0;
 480
 481                 return;
 482         }
 483
 484         /* status not changed */
 485         if (!strncmp(env_str, event, UEVENT_BUF_SIZE))
 486                 return;
 487
 488         /* save the status and notify the update */
 489         strncpy(env_str, event, UEVENT_BUF_SIZE);
 490         kobject_uevent(&cm->dev->kobj, KOBJ_CHANGE);
 491
 492         dev_info(cm->dev, "%s\n", event);
 493 }
 494
 495 /**
 496  * fullbatt_vchk - Check voltage drop some times after "FULL" event.
 497  * @work: the work_struct appointing the function
 498  *
 499  * If a user has designated "fullbatt_vchkdrop_ms/uV" values with
 500  * charger_desc, Charger Manager checks voltage drop after the battery
 501  * "FULL" event. It checks whether the voltage has dropped more than
 502  * fullbatt_vchkdrop_uV by calling this function after fullbatt_vchkrop_ms.
 503  */
 504 static void fullbatt_vchk(struct work_struct *work)
 505 {
 506         struct delayed_work *dwork = to_delayed_work(work);
 507         struct charger_manager *cm = container_of(dwork,
 508                         struct charger_manager, fullbatt_vchk_work);
 509         struct charger_desc *desc = cm->desc;
 510         int batt_uV, err, diff;
 511
 512         /* remove the appointment for fullbatt_vchk */
 513         cm->fullbatt_vchk_jiffies_at = 0;
 514
 515         if (!desc->fullbatt_vchkdrop_uV || !desc->fullbatt_vchkdrop_ms)
 516                 return;
 517
 518         err = get_batt_uV(cm, &batt_uV);
 519         if (err) {
 520                 dev_err(cm->dev, "%s: get_batt_uV error(%d)\n", __func__, err);
 521                 return;
 522         }
 523
 524         diff = desc->fullbatt_uV - batt_uV;
 525         if (diff < 0)
 526                 return;
 527
 528         dev_info(cm->dev, "VBATT dropped %duV after full-batt\n", diff);
 529
 530         if (diff > desc->fullbatt_vchkdrop_uV) {
 531                 try_charger_restart(cm);
 532                 uevent_notify(cm, "Recharging");
 533         }
 534 }
 535
 536 /**
 537  * check_charging_duration - Monitor charging/discharging duration
 538  * @cm: the Charger Manager representing the battery.
 539  *
 540  * If whole charging duration exceed 'charging_max_duration_ms',
 541  * cm stop charging to prevent overcharge/overheat. If discharging
 542  * duration exceed 'discharging _max_duration_ms', charger cable is
 543  * attached, after full-batt, cm start charging to maintain fully
 544  * charged state for battery.
 545  */
 546 static int check_charging_duration(struct charger_manager *cm)
 547 {
 548         struct charger_desc *desc = cm->desc;
 549         u64 curr = ktime_to_ms(ktime_get());
 550         u64 duration;
 551         int ret = false;
 552
 553         if (!desc->charging_max_duration_ms &&
 554                         !desc->discharging_max_duration_ms)
 555                 return ret;
 556
 557         if (cm->charger_enabled) {
 558                 duration = curr - cm->charging_start_time;
 559
 560                 if (duration > desc->charging_max_duration_ms) {
 561                         dev_info(cm->dev, "Charging duration exceed %ums\n",
 562                                  desc->charging_max_duration_ms);
 563                         uevent_notify(cm, "Discharging");
 564                         try_charger_enable(cm, false);
 565                         ret = true;
 566                 }
 567         } else if (is_ext_pwr_online(cm) && !cm->charger_enabled) {
 568                 duration = curr - cm->charging_end_time;
 569
 570                 if (duration > desc->charging_max_duration_ms &&
 571                                 is_ext_pwr_online(cm)) {
 572                         dev_info(cm->dev, "Discharging duration exceed %ums\n",
 573                                  desc->discharging_max_duration_ms);
 574                         uevent_notify(cm, "Recharging");
 575                         try_charger_enable(cm, true);
 576                         ret = true;
 577                 }
 578         }
 579
 580         return ret;
 581 }
 582
 583 static int cm_get_battery_temperature_by_psy(struct charger_manager *cm,
 584                                         int *temp)
 585 {
 586         struct power_supply *fuel_gauge;
 587
 588         fuel_gauge = power_supply_get_by_name(cm->desc->psy_fuel_gauge);
 589         if (!fuel_gauge)
 590                 return -ENODEV;
 591
 592         return fuel_gauge->get_property(fuel_gauge,
 593                                 POWER_SUPPLY_PROP_TEMP,
 594                                 (union power_supply_propval *)temp);
 595 }
 596
 597 static int cm_get_battery_temperature(struct charger_manager *cm,
 598                                         int *temp)
 599 {
 600         int ret;
 601
 602         if (!cm->desc->measure_battery_temp)
 603                 return -ENODEV;
 604
 605 #ifdef CONFIG_THERMAL
 606         if (cm->tzd_batt) {
 607                 ret = thermal_zone_get_temp(cm->tzd_batt, (unsigned long *)temp);
 608                 if (!ret)
 609                         /* Calibrate temperature unit */
 610                         *temp /= 100;
 611         } else
 612 #endif
 613         {
 614                 /* if-else continued from CONFIG_THERMAL */
 615                 ret = cm_get_battery_temperature_by_psy(cm, temp);
 616         }
 617
 618         return ret;
 619 }
 620
 621 static int cm_check_thermal_status(struct charger_manager *cm)
 622 {
 623         struct charger_desc *desc = cm->desc;
 624         int temp, upper_limit, lower_limit;
 625         int ret = 0;
 626
 627         ret = cm_get_battery_temperature(cm, &temp);
 628         if (ret) {
 629                 /* FIXME:
 630                  * No information of battery temperature might
 631                  * occur hazadous result. We have to handle it
 632                  * depending on battery type.
 633                  */
 634                 dev_err(cm->dev, "Failed to get battery temperature\n");
 635                 return 0;
 636         }
 637
 638         upper_limit = desc->temp_max;
 639         lower_limit = desc->temp_min;
 640
 641         if (cm->emergency_stop) {
 642                 upper_limit -= desc->temp_diff;
 643                 lower_limit += desc->temp_diff;
 644         }
 645
 646         if (temp > upper_limit)
 647                 ret = CM_EVENT_BATT_OVERHEAT;
 648         else if (temp < lower_limit)
 649                 ret = CM_EVENT_BATT_COLD;
 650
 651         return ret;
 652 }
 653
 654 /**
 655  * _cm_monitor - Monitor the temperature and return true for exceptions.
 656  * @cm: the Charger Manager representing the battery.
 657  *
 658  * Returns true if there is an event to notify for the battery.
 659  * (True if the status of "emergency_stop" changes)
 660  */
 661 static bool _cm_monitor(struct charger_manager *cm)
 662 {
 663         int temp_alrt;
 664
 665         temp_alrt = cm_check_thermal_status(cm);
 666
 667         /* It has been stopped already */
 668         if (temp_alrt && cm->emergency_stop)
 669                 return false;
 670
 671         /*
 672          * Check temperature whether overheat or cold.
 673          * If temperature is out of range normal state, stop charging.
 674          */
 675         if (temp_alrt) {
 676                 cm->emergency_stop = temp_alrt;
 677                 if (!try_charger_enable(cm, false))
 678                         uevent_notify(cm, default_event_names[temp_alrt]);
 679
 680         /*
 681          * Check whole charging duration and discharing duration
 682          * after full-batt.
 683          */
 684         } else if (!cm->emergency_stop && check_charging_duration(cm)) {
 685                 dev_dbg(cm->dev,
 686                         "Charging/Discharging duration is out of range\n");
 687         /*
 688          * Check dropped voltage of battery. If battery voltage is more
 689          * dropped than fullbatt_vchkdrop_uV after fully charged state,
 690          * charger-manager have to recharge battery.
 691          */
 692         } else if (!cm->emergency_stop && is_ext_pwr_online(cm) &&
 693                         !cm->charger_enabled) {
 694                 fullbatt_vchk(&cm->fullbatt_vchk_work.work);
 695
 696         /*
 697          * Check whether fully charged state to protect overcharge
 698          * if charger-manager is charging for battery.
 699          */
 700         } else if (!cm->emergency_stop && is_full_charged(cm) &&
 701                         cm->charger_enabled) {
 702                 dev_info(cm->dev, "EVENT_HANDLE: Battery Fully Charged\n");
 703                 uevent_notify(cm, default_event_names[CM_EVENT_BATT_FULL]);
 704
 705                 try_charger_enable(cm, false);
 706
 707                 fullbatt_vchk(&cm->fullbatt_vchk_work.work);
 708         } else {
 709                 cm->emergency_stop = 0;
 710                 if (is_ext_pwr_online(cm)) {
 711                         if (!try_charger_enable(cm, true))
 712                                 uevent_notify(cm, "CHARGING");
 713                 }
 714         }
 715
 716         return true;
 717 }
 718
 719 /**
 720  * cm_monitor - Monitor every battery.
 721  *
 722  * Returns true if there is an event to notify from any of the batteries.
 723  * (True if the status of "emergency_stop" changes)
 724  */
 725 static bool cm_monitor(void)
 726 {
 727         bool stop = false;
 728         struct charger_manager *cm;
 729
 730         mutex_lock(&cm_list_mtx);
 731
 732         list_for_each_entry(cm, &cm_list, entry) {
 733                 if (_cm_monitor(cm))
 734                         stop = true;
 735         }
 736
 737         mutex_unlock(&cm_list_mtx);
 738
 739         return stop;
 740 }
 741
 742 /**
 743  * _setup_polling - Setup the next instance of polling.
 744  * @work: work_struct of the function _setup_polling.
 745  */
 746 static void _setup_polling(struct work_struct *work)
 747 {
 748         unsigned long min = ULONG_MAX;
 749         struct charger_manager *cm;
 750         bool keep_polling = false;
 751         unsigned long _next_polling;
 752
 753         mutex_lock(&cm_list_mtx);
 754
 755         list_for_each_entry(cm, &cm_list, entry) {
 756                 if (is_polling_required(cm) && cm->desc->polling_interval_ms) {
 757                         keep_polling = true;
 758
 759                         if (min > cm->desc->polling_interval_ms)
 760                                 min = cm->desc->polling_interval_ms;
 761                 }
 762         }
 763
 764         polling_jiffy = msecs_to_jiffies(min);
 765         if (polling_jiffy <= CM_JIFFIES_SMALL)
 766                 polling_jiffy = CM_JIFFIES_SMALL + 1;
 767
 768         if (!keep_polling)
 769                 polling_jiffy = ULONG_MAX;
 770         if (polling_jiffy == ULONG_MAX)
 771                 goto out;
 772
 773         WARN(cm_wq == NULL, "charger-manager: workqueue not initialized"
 774                             ". try it later. %s\n", __func__);
 775
 776         /*
 777          * Use mod_delayed_work() iff the next polling interval should
 778          * occur before the currently scheduled one.  If @cm_monitor_work
 779          * isn't active, the end result is the same, so no need to worry
 780          * about stale @next_polling.
 781          */
 782         _next_polling = jiffies + polling_jiffy;
 783
 784         if (time_before(_next_polling, next_polling)) {
 785                 mod_delayed_work(cm_wq, &cm_monitor_work, polling_jiffy);
 786                 next_polling = _next_polling;
 787         } else {
 788                 if (queue_delayed_work(cm_wq, &cm_monitor_work, polling_jiffy))
 789                         next_polling = _next_polling;
 790         }
 791 out:
 792         mutex_unlock(&cm_list_mtx);
 793 }
 794 static DECLARE_WORK(setup_polling, _setup_polling);
 795
 796 /**
 797  * cm_monitor_poller - The Monitor / Poller.
 798  * @work: work_struct of the function cm_monitor_poller
 799  *
 800  * During non-suspended state, cm_monitor_poller is used to poll and monitor
 801  * the batteries.
 802  */
 803 static void cm_monitor_poller(struct work_struct *work)
 804 {
 805         cm_monitor();
 806         schedule_work(&setup_polling);
 807 }
 808
 809 /**
 810  * fullbatt_handler - Event handler for CM_EVENT_BATT_FULL
 811  * @cm: the Charger Manager representing the battery.
 812  */
 813 static void fullbatt_handler(struct charger_manager *cm)
 814 {
 815         struct charger_desc *desc = cm->desc;
 816
 817         if (!desc->fullbatt_vchkdrop_uV || !desc->fullbatt_vchkdrop_ms)
 818                 goto out;
 819
 820         if (cm_suspended)
 821                 device_set_wakeup_capable(cm->dev, true);
 822
 823         mod_delayed_work(cm_wq, &cm->fullbatt_vchk_work,
 824                          msecs_to_jiffies(desc->fullbatt_vchkdrop_ms));
 825         cm->fullbatt_vchk_jiffies_at = jiffies + msecs_to_jiffies(
 826                                        desc->fullbatt_vchkdrop_ms);
 827
 828         if (cm->fullbatt_vchk_jiffies_at == 0)
 829                 cm->fullbatt_vchk_jiffies_at = 1;
 830
 831 out:
 832         dev_info(cm->dev, "EVENT_HANDLE: Battery Fully Charged\n");
 833         uevent_notify(cm, default_event_names[CM_EVENT_BATT_FULL]);
 834 }
 835
 836 /**
 837  * battout_handler - Event handler for CM_EVENT_BATT_OUT
 838  * @cm: the Charger Manager representing the battery.
 839  */
 840 static void battout_handler(struct charger_manager *cm)
 841 {
 842         if (cm_suspended)
 843                 device_set_wakeup_capable(cm->dev, true);
 844
 845         if (!is_batt_present(cm)) {
 846                 dev_emerg(cm->dev, "Battery Pulled Out!\n");
 847                 uevent_notify(cm, default_event_names[CM_EVENT_BATT_OUT]);
 848         } else {
 849                 uevent_notify(cm, "Battery Reinserted?");
 850         }
 851 }
 852
 853 /**
 854  * misc_event_handler - Handler for other evnets
 855  * @cm: the Charger Manager representing the battery.
 856  * @type: the Charger Manager representing the battery.
 857  */
 858 static void misc_event_handler(struct charger_manager *cm,
 859                         enum cm_event_types type)
 860 {
 861         if (cm_suspended)
 862                 device_set_wakeup_capable(cm->dev, true);
 863
 864         if (is_polling_required(cm) && cm->desc->polling_interval_ms)
 865                 schedule_work(&setup_polling);
 866         uevent_notify(cm, default_event_names[type]);
 867 }
 868
 869 static int charger_get_property(struct power_supply *psy,
 870                 enum power_supply_property psp,
 871                 union power_supply_propval *val)
 872 {
 873         struct charger_manager *cm = container_of(psy,
 874                         struct charger_manager, charger_psy);
 875         struct charger_desc *desc = cm->desc;
 876         struct power_supply *fuel_gauge;
 877         int ret = 0;
 878         int uV;
 879
 880         switch (psp) {
 881         case POWER_SUPPLY_PROP_STATUS:
 882                 if (is_charging(cm))
 883                         val->intval = POWER_SUPPLY_STATUS_CHARGING;
 884                 else if (is_ext_pwr_online(cm))
 885                         val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
 886                 else
 887                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 888                 break;
 889         case POWER_SUPPLY_PROP_HEALTH:
 890                 if (cm->emergency_stop > 0)
 891                         val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
 892                 else if (cm->emergency_stop < 0)
 893                         val->intval = POWER_SUPPLY_HEALTH_COLD;
 894                 else
 895                         val->intval = POWER_SUPPLY_HEALTH_GOOD;
 896                 break;
 897         case POWER_SUPPLY_PROP_PRESENT:
 898                 if (is_batt_present(cm))
 899                         val->intval = 1;
 900                 else
 901                         val->intval = 0;
 902                 break;
 903         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 904                 ret = get_batt_uV(cm, &val->intval);
 905                 break;
 906         case POWER_SUPPLY_PROP_CURRENT_NOW:
 907                 fuel_gauge = power_supply_get_by_name(cm->desc->psy_fuel_gauge);
 908                 if (!fuel_gauge) {
 909                         ret = -ENODEV;
 910                         break;
 911                 }
 912                 ret = fuel_gauge->get_property(fuel_gauge,
 913                                 POWER_SUPPLY_PROP_CURRENT_NOW, val);
 914                 break;
 915         case POWER_SUPPLY_PROP_TEMP:
 916         case POWER_SUPPLY_PROP_TEMP_AMBIENT:
 917                 return cm_get_battery_temperature(cm, &val->intval);
 918         case POWER_SUPPLY_PROP_CAPACITY:
 919                 fuel_gauge = power_supply_get_by_name(cm->desc->psy_fuel_gauge);
 920                 if (!fuel_gauge) {
 921                         ret = -ENODEV;
 922                         break;
 923                 }
 924
 925                 if (!is_batt_present(cm)) {
 926                         /* There is no battery. Assume 100% */
 927                         val->intval = 100;
 928                         break;
 929                 }
 930
 931                 ret = fuel_gauge->get_property(fuel_gauge,
 932                                         POWER_SUPPLY_PROP_CAPACITY, val);
 933                 if (ret)
 934                         break;
 935
 936                 if (val->intval > 100) {
 937                         val->intval = 100;
 938                         break;
 939                 }
 940                 if (val->intval < 0)
 941                         val->intval = 0;
 942
 943                 /* Do not adjust SOC when charging: voltage is overrated */
 944                 if (is_charging(cm))
 945                         break;
 946
 947                 /*
 948                  * If the capacity value is inconsistent, calibrate it base on
 949                  * the battery voltage values and the thresholds given as desc
 950                  */
 951                 ret = get_batt_uV(cm, &uV);
 952                 if (ret) {
 953                         /* Voltage information not available. No calibration */
 954                         ret = 0;
 955                         break;
 956                 }
 957
 958                 if (desc->fullbatt_uV > 0 && uV >= desc->fullbatt_uV &&
 959                     !is_charging(cm)) {
 960                         val->intval = 100;
 961                         break;
 962                 }
 963
 964                 break;
 965         case POWER_SUPPLY_PROP_ONLINE:
 966                 if (is_ext_pwr_online(cm))
 967                         val->intval = 1;
 968                 else
 969                         val->intval = 0;
 970                 break;
 971         case POWER_SUPPLY_PROP_CHARGE_FULL:
 972                 if (is_full_charged(cm))
 973                         val->intval = 1;
 974                 else
 975                         val->intval = 0;
 976                 ret = 0;
 977                 break;
 978         case POWER_SUPPLY_PROP_CHARGE_NOW:
 979                 if (is_charging(cm)) {
 980                         fuel_gauge = power_supply_get_by_name(
 981                                         cm->desc->psy_fuel_gauge);
 982                         if (!fuel_gauge) {
 983                                 ret = -ENODEV;
 984                                 break;
 985                         }
 986
 987                         ret = fuel_gauge->get_property(fuel_gauge,
 988                                                 POWER_SUPPLY_PROP_CHARGE_NOW,
 989                                                 val);
 990                         if (ret) {
 991                                 val->intval = 1;
 992                                 ret = 0;
 993                         } else {
 994                                 /* If CHARGE_NOW is supplied, use it */
 995                                 val->intval = (val->intval > 0) ?
 996                                                 val->intval : 1;
 997                         }
 998                 } else {
 999                         val->intval = 0;
1000                 }
1001                 break;
1002         default:
1003                 return -EINVAL;
1004         }
1005         return ret;
1006 }
1007
1008 #define NUM_CHARGER_PSY_OPTIONAL        (4)
1009 static enum power_supply_property default_charger_props[] = {
1010         /* Guaranteed to provide */
1011         POWER_SUPPLY_PROP_STATUS,
1012         POWER_SUPPLY_PROP_HEALTH,
1013         POWER_SUPPLY_PROP_PRESENT,
1014         POWER_SUPPLY_PROP_VOLTAGE_NOW,
1015         POWER_SUPPLY_PROP_CAPACITY,
1016         POWER_SUPPLY_PROP_ONLINE,
1017         POWER_SUPPLY_PROP_CHARGE_FULL,
1018         /*
1019          * Optional properties are:
1020          * POWER_SUPPLY_PROP_CHARGE_NOW,
1021          * POWER_SUPPLY_PROP_CURRENT_NOW,
1022          * POWER_SUPPLY_PROP_TEMP, and
1023          * POWER_SUPPLY_PROP_TEMP_AMBIENT,
1024          */
1025 };
1026
1027 static struct power_supply psy_default = {
1028         .name = "battery",
1029         .type = POWER_SUPPLY_TYPE_BATTERY,
1030         .properties = default_charger_props,
1031         .num_properties = ARRAY_SIZE(default_charger_props),
1032         .get_property = charger_get_property,
1033 };
1034
1035 /**
1036  * cm_setup_timer - For in-suspend monitoring setup wakeup alarm
1037  *                  for suspend_again.
1038  *
1039  * Returns true if the alarm is set for Charger Manager to use.
1040  * Returns false if
1041  *      cm_setup_timer fails to set an alarm,
1042  *      cm_setup_timer does not need to set an alarm for Charger Manager,
1043  *      or an alarm previously configured is to be used.
1044  */
1045 static bool cm_setup_timer(void)
1046 {
1047         struct charger_manager *cm;
1048         unsigned int wakeup_ms = UINT_MAX;
1049         bool ret = false;
1050
1051         mutex_lock(&cm_list_mtx);
1052
1053         list_for_each_entry(cm, &cm_list, entry) {
1054                 unsigned int fbchk_ms = 0;
1055
1056                 /* fullbatt_vchk is required. setup timer for that */
1057                 if (cm->fullbatt_vchk_jiffies_at) {
1058                         fbchk_ms = jiffies_to_msecs(cm->fullbatt_vchk_jiffies_at
1059                                                     - jiffies);
1060                         if (time_is_before_eq_jiffies(
1061                                 cm->fullbatt_vchk_jiffies_at) ||
1062                                 msecs_to_jiffies(fbchk_ms) < CM_JIFFIES_SMALL) {
1063                                 fullbatt_vchk(&cm->fullbatt_vchk_work.work);
1064                                 fbchk_ms = 0;
1065                         }
1066                 }
1067                 CM_MIN_VALID(wakeup_ms, fbchk_ms);
1068
1069                 /* Skip if polling is not required for this CM */
1070                 if (!is_polling_required(cm) && !cm->emergency_stop)
1071                         continue;
1072                 if (cm->desc->polling_interval_ms == 0)
1073                         continue;
1074                 CM_MIN_VALID(wakeup_ms, cm->desc->polling_interval_ms);
1075         }
1076
1077         mutex_unlock(&cm_list_mtx);
1078
1079         if (wakeup_ms < UINT_MAX && wakeup_ms > 0) {
1080                 pr_info("Charger Manager wakeup timer: %u ms\n", wakeup_ms);
1081                 if (rtc_dev) {
1082                         struct rtc_wkalrm tmp;
1083                         unsigned long time, now;
1084                         unsigned long add = DIV_ROUND_UP(wakeup_ms, 1000);
1085
1086                         /*
1087                          * Set alarm with the polling interval (wakeup_ms)
1088                          * except when rtc_wkalarm_save comes first.
1089                          * However, the alarm time should be NOW +
1090                          * CM_RTC_SMALL or later.
1091                          */
1092                         tmp.enabled = 1;
1093                         rtc_read_time(rtc_dev, &tmp.time);
1094                         rtc_tm_to_time(&tmp.time, &now);
1095                         if (add < CM_RTC_SMALL)
1096                                 add = CM_RTC_SMALL;
1097                         time = now + add;
1098
1099                         ret = true;
1100
1101                         if (rtc_wkalarm_save.enabled &&
1102                             rtc_wkalarm_save_time &&
1103                             rtc_wkalarm_save_time < time) {
1104                                 if (rtc_wkalarm_save_time < now + CM_RTC_SMALL)
1105                                         time = now + CM_RTC_SMALL;
1106                                 else
1107                                         time = rtc_wkalarm_save_time;
1108
1109                                 /* The timer is not appointed by CM */
1110                                 ret = false;
1111                         }
1112
1113                         pr_info("Waking up after %lu secs\n", time - now);
1114
1115                         rtc_time_to_tm(time, &tmp.time);
1116                         rtc_set_alarm(rtc_dev, &tmp);
1117                         cm_suspend_duration_ms += wakeup_ms;
1118                         return ret;
1119                 }
1120         }
1121
1122         if (rtc_dev)
1123                 rtc_set_alarm(rtc_dev, &rtc_wkalarm_save);
1124         return false;
1125 }
1126
1127 static void _cm_fbchk_in_suspend(struct charger_manager *cm)
1128 {
1129         unsigned long jiffy_now = jiffies;
1130
1131         if (!cm->fullbatt_vchk_jiffies_at)
1132                 return;
1133
1134         if (g_desc && g_desc->assume_timer_stops_in_suspend)
1135                 jiffy_now += msecs_to_jiffies(cm_suspend_duration_ms);
1136
1137         /* Execute now if it's going to be executed not too long after */
1138         jiffy_now += CM_JIFFIES_SMALL;
1139
1140         if (time_after_eq(jiffy_now, cm->fullbatt_vchk_jiffies_at))
1141                 fullbatt_vchk(&cm->fullbatt_vchk_work.work);
1142 }
1143
1144 /**
1145  * cm_suspend_again - Determine whether suspend again or not
1146  *
1147  * Returns true if the system should be suspended again
1148  * Returns false if the system should be woken up
1149  */
1150 bool cm_suspend_again(void)
1151 {
1152         struct charger_manager *cm;
1153         bool ret = false;
1154
1155         if (!g_desc || !g_desc->rtc_only_wakeup || !g_desc->rtc_only_wakeup() ||
1156             !cm_rtc_set)
1157                 return false;
1158
1159         if (cm_monitor())
1160                 goto out;
1161
1162         ret = true;
1163         mutex_lock(&cm_list_mtx);
1164         list_for_each_entry(cm, &cm_list, entry) {
1165                 _cm_fbchk_in_suspend(cm);
1166
1167                 if (cm->status_save_ext_pwr_inserted != is_ext_pwr_online(cm) ||
1168                     cm->status_save_batt != is_batt_present(cm)) {
1169                         ret = false;
1170                         break;
1171                 }
1172         }
1173         mutex_unlock(&cm_list_mtx);
1174
1175         cm_rtc_set = cm_setup_timer();
1176 out:
1177         /* It's about the time when the non-CM appointed timer goes off */
1178         if (rtc_wkalarm_save.enabled) {
1179                 unsigned long now;
1180                 struct rtc_time tmp;
1181
1182                 rtc_read_time(rtc_dev, &tmp);
1183                 rtc_tm_to_time(&tmp, &now);
1184
1185                 if (rtc_wkalarm_save_time &&
1186                     now + CM_RTC_SMALL >= rtc_wkalarm_save_time)
1187                         return false;
1188         }
1189         return ret;
1190 }
1191 EXPORT_SYMBOL_GPL(cm_suspend_again);
1192
1193 /**
1194  * setup_charger_manager - initialize charger_global_desc data
1195  * @gd: pointer to instance of charger_global_desc
1196  */
1197 int setup_charger_manager(struct charger_global_desc *gd)
1198 {
1199         if (!gd)
1200                 return -EINVAL;
1201
1202         if (rtc_dev)
1203                 rtc_class_close(rtc_dev);
1204         rtc_dev = NULL;
1205         g_desc = NULL;
1206
1207         if (!gd->rtc_only_wakeup) {
1208                 pr_err("The callback rtc_only_wakeup is not given\n");
1209                 return -EINVAL;
1210         }
1211
1212         if (gd->rtc_name) {
1213                 rtc_dev = rtc_class_open(gd->rtc_name);
1214                 if (IS_ERR_OR_NULL(rtc_dev)) {
1215                         rtc_dev = NULL;
1216                         /* Retry at probe. RTC may be not registered yet */
1217                 }
1218         } else {
1219                 pr_warn("No wakeup timer is given for charger manager.  "
1220                         "In-suspend monitoring won't work.\n");
1221         }
1222
1223         g_desc = gd;
1224         return 0;
1225 }
1226 EXPORT_SYMBOL_GPL(setup_charger_manager);
1227
1228 /**
1229  * charger_extcon_work - enable/diable charger according to the state
1230  *                      of charger cable
1231  *
1232  * @work: work_struct of the function charger_extcon_work.
1233  */
1234 static void charger_extcon_work(struct work_struct *work)
1235 {
1236         struct charger_cable *cable =
1237                         container_of(work, struct charger_cable, wq);
1238         int ret;
1239
1240         if (cable->attached && cable->min_uA != 0 && cable->max_uA != 0) {
1241                 ret = regulator_set_current_limit(cable->charger->consumer,
1242                                         cable->min_uA, cable->max_uA);
1243                 if (ret < 0) {
1244                         pr_err("Cannot set current limit of %s (%s)\n",
1245                                cable->charger->regulator_name, cable->name);
1246                         return;
1247                 }
1248
1249                 pr_info("Set current limit of %s : %duA ~ %duA\n",
1250                         cable->charger->regulator_name,
1251                         cable->min_uA, cable->max_uA);
1252         }
1253
1254         try_charger_enable(cable->cm, cable->attached);
1255 }
1256
1257 /**
1258  * charger_extcon_notifier - receive the state of charger cable
1259  *                      when registered cable is attached or detached.
1260  *
1261  * @self: the notifier block of the charger_extcon_notifier.
1262  * @event: the cable state.
1263  * @ptr: the data pointer of notifier block.
1264  */
1265 static int charger_extcon_notifier(struct notifier_block *self,
1266                         unsigned long event, void *ptr)
1267 {
1268         struct charger_cable *cable =
1269                 container_of(self, struct charger_cable, nb);
1270
1271         /*
1272          * The newly state of charger cable.
1273          * If cable is attached, cable->attached is true.
1274          */
1275         cable->attached = event;
1276
1277         /*
1278          * Setup monitoring to check battery state
1279          * when charger cable is attached.
1280          */
1281         if (cable->attached && is_polling_required(cable->cm)) {
1282                 cancel_work_sync(&setup_polling);
1283                 schedule_work(&setup_polling);
1284         }
1285
1286         /*
1287          * Setup work for controlling charger(regulator)
1288          * according to charger cable.
1289          */
1290         schedule_work(&cable->wq);
1291
1292         return NOTIFY_DONE;
1293 }
1294
1295 /**
1296  * charger_extcon_init - register external connector to use it
1297  *                      as the charger cable
1298  *
1299  * @cm: the Charger Manager representing the battery.
1300  * @cable: the Charger cable representing the external connector.
1301  */
1302 static int charger_extcon_init(struct charger_manager *cm,
1303                 struct charger_cable *cable)
1304 {
1305         int ret = 0;
1306
1307         /*
1308          * Charger manager use Extcon framework to identify
1309          * the charger cable among various external connector
1310          * cable (e.g., TA, USB, MHL, Dock).
1311          */
1312         INIT_WORK(&cable->wq, charger_extcon_work);
1313         cable->nb.notifier_call = charger_extcon_notifier;
1314         ret = extcon_register_interest(&cable->extcon_dev,
1315                         cable->extcon_name, cable->name, &cable->nb);
1316         if (ret < 0) {
1317                 pr_info("Cannot register extcon_dev for %s(cable: %s)\n",
1318                         cable->extcon_name, cable->name);
1319                 ret = -EINVAL;
1320         }
1321
1322         return ret;
1323 }
1324
1325 /**
1326  * charger_manager_register_extcon - Register extcon device to recevie state
1327  *                                   of charger cable.
1328  * @cm: the Charger Manager representing the battery.
1329  *
1330  * This function support EXTCON(External Connector) subsystem to detect the
1331  * state of charger cables for enabling or disabling charger(regulator) and
1332  * select the charger cable for charging among a number of external cable
1333  * according to policy of H/W board.
1334  */
1335 static int charger_manager_register_extcon(struct charger_manager *cm)
1336 {
1337         struct charger_desc *desc = cm->desc;
1338         struct charger_regulator *charger;
1339         int ret = 0;
1340         int i;
1341         int j;
1342
1343         for (i = 0; i < desc->num_charger_regulators; i++) {
1344                 charger = &desc->charger_regulators[i];
1345
1346                 charger->consumer = regulator_get(cm->dev,
1347                                         charger->regulator_name);
1348                 if (IS_ERR(charger->consumer)) {
1349                         dev_err(cm->dev, "Cannot find charger(%s)\n",
1350                                 charger->regulator_name);
1351                         return PTR_ERR(charger->consumer);
1352                 }
1353                 charger->cm = cm;
1354
1355                 for (j = 0; j < charger->num_cables; j++) {
1356                         struct charger_cable *cable = &charger->cables[j];
1357
1358                         ret = charger_extcon_init(cm, cable);
1359                         if (ret < 0) {
1360                                 dev_err(cm->dev, "Cannot initialize charger(%s)\n",
1361                                         charger->regulator_name);
1362                                 goto err;
1363                         }
1364                         cable->charger = charger;
1365                         cable->cm = cm;
1366                 }
1367         }
1368
1369 err:
1370         return ret;
1371 }
1372
1373 /* help function of sysfs node to control charger(regulator) */
1374 static ssize_t charger_name_show(struct device *dev,
1375                                 struct device_attribute *attr, char *buf)
1376 {
1377         struct charger_regulator *charger
1378                 = container_of(attr, struct charger_regulator, attr_name);
1379
1380         return sprintf(buf, "%s\n", charger->regulator_name);
1381 }
1382
1383 static ssize_t charger_state_show(struct device *dev,
1384                                 struct device_attribute *attr, char *buf)
1385 {
1386         struct charger_regulator *charger
1387                 = container_of(attr, struct charger_regulator, attr_state);
1388         int state = 0;
1389
1390         if (!charger->externally_control)
1391                 state = regulator_is_enabled(charger->consumer);
1392
1393         return sprintf(buf, "%s\n", state ? "enabled" : "disabled");
1394 }
1395
1396 static ssize_t charger_externally_control_show(struct device *dev,
1397                                 struct device_attribute *attr, char *buf)
1398 {
1399         struct charger_regulator *charger = container_of(attr,
1400                         struct charger_regulator, attr_externally_control);
1401
1402         return sprintf(buf, "%d\n", charger->externally_control);
1403 }
1404
1405 static ssize_t charger_externally_control_store(struct device *dev,
1406                                 struct device_attribute *attr, const char *buf,
1407                                 size_t count)
1408 {
1409         struct charger_regulator *charger
1410                 = container_of(attr, struct charger_regulator,
1411                                         attr_externally_control);
1412         struct charger_manager *cm = charger->cm;
1413         struct charger_desc *desc = cm->desc;
1414         int i;
1415         int ret;
1416         int externally_control;
1417         int chargers_externally_control = 1;
1418
1419         ret = sscanf(buf, "%d", &externally_control);
1420         if (ret == 0) {
1421                 ret = -EINVAL;
1422                 return ret;
1423         }
1424
1425         if (!externally_control) {
1426                 charger->externally_control = 0;
1427                 return count;
1428         }
1429
1430         for (i = 0; i < desc->num_charger_regulators; i++) {
1431                 if (&desc->charger_regulators[i] != charger &&
1432                         !desc->charger_regulators[i].externally_control) {
1433                         /*
1434                          * At least, one charger is controlled by
1435                          * charger-manager
1436                          */
1437                         chargers_externally_control = 0;
1438                         break;
1439                 }
1440         }
1441
1442         if (!chargers_externally_control) {
1443                 if (cm->charger_enabled) {
1444                         try_charger_enable(charger->cm, false);
1445                         charger->externally_control = externally_control;
1446                         try_charger_enable(charger->cm, true);
1447                 } else {
1448                         charger->externally_control = externally_control;
1449                 }
1450         } else {
1451                 dev_warn(cm->dev,
1452                          "'%s' regulator should be controlled in charger-manager because charger-manager must need at least one charger for charging\n",
1453                          charger->regulator_name);
1454         }
1455
1456         return count;
1457 }
1458
1459 /**
1460  * charger_manager_register_sysfs - Register sysfs entry for each charger
1461  * @cm: the Charger Manager representing the battery.
1462  *
1463  * This function add sysfs entry for charger(regulator) to control charger from
1464  * user-space. If some development board use one more chargers for charging
1465  * but only need one charger on specific case which is dependent on user
1466  * scenario or hardware restrictions, the user enter 1 or 0(zero) to '/sys/
1467  * class/power_supply/battery/charger.[index]/externally_control'. For example,
1468  * if user enter 1 to 'sys/class/power_supply/battery/charger.[index]/
1469  * externally_control, this charger isn't controlled from charger-manager and
1470  * always stay off state of regulator.
1471  */
1472 static int charger_manager_register_sysfs(struct charger_manager *cm)
1473 {
1474         struct charger_desc *desc = cm->desc;
1475         struct charger_regulator *charger;
1476         int chargers_externally_control = 1;
1477         char buf[11];
1478         char *str;
1479         int ret = 0;
1480         int i;
1481
1482         /* Create sysfs entry to control charger(regulator) */
1483         for (i = 0; i < desc->num_charger_regulators; i++) {
1484                 charger = &desc->charger_regulators[i];
1485
1486                 snprintf(buf, 10, "charger.%d", i);
1487                 str = devm_kzalloc(cm->dev,
1488                                 sizeof(char) * (strlen(buf) + 1), GFP_KERNEL);
1489                 if (!str) {
1490                         ret = -ENOMEM;
1491                         goto err;
1492                 }
1493                 strcpy(str, buf);
1494
1495                 charger->attrs[0] = &charger->attr_name.attr;
1496                 charger->attrs[1] = &charger->attr_state.attr;
1497                 charger->attrs[2] = &charger->attr_externally_control.attr;
1498                 charger->attrs[3] = NULL;
1499                 charger->attr_g.name = str;
1500                 charger->attr_g.attrs = charger->attrs;
1501
1502                 sysfs_attr_init(&charger->attr_name.attr);
1503                 charger->attr_name.attr.name = "name";
1504                 charger->attr_name.attr.mode = 0444;
1505                 charger->attr_name.show = charger_name_show;
1506
1507                 sysfs_attr_init(&charger->attr_state.attr);
1508                 charger->attr_state.attr.name = "state";
1509                 charger->attr_state.attr.mode = 0444;
1510                 charger->attr_state.show = charger_state_show;
1511
1512                 sysfs_attr_init(&charger->attr_externally_control.attr);
1513                 charger->attr_externally_control.attr.name
1514                                 = "externally_control";
1515                 charger->attr_externally_control.attr.mode = 0644;
1516                 charger->attr_externally_control.show
1517                                 = charger_externally_control_show;
1518                 charger->attr_externally_control.store
1519                                 = charger_externally_control_store;
1520
1521                 if (!desc->charger_regulators[i].externally_control ||
1522                                 !chargers_externally_control)
1523                         chargers_externally_control = 0;
1524
1525                 dev_info(cm->dev, "'%s' regulator's externally_control is %d\n",
1526                          charger->regulator_name, charger->externally_control);
1527
1528                 ret = sysfs_create_group(&cm->charger_psy.dev->kobj,
1529                                         &charger->attr_g);
1530                 if (ret < 0) {
1531                         dev_err(cm->dev, "Cannot create sysfs entry of %s regulator\n",
1532                                 charger->regulator_name);
1533                         ret = -EINVAL;
1534                         goto err;
1535                 }
1536         }
1537
1538         if (chargers_externally_control) {
1539                 dev_err(cm->dev, "Cannot register regulator because charger-manager must need at least one charger for charging battery\n");
1540                 ret = -EINVAL;
1541                 goto err;
1542         }
1543
1544 err:
1545         return ret;
1546 }
1547
1548 static int cm_init_thermal_data(struct charger_manager *cm,
1549                 struct power_supply *fuel_gauge)
1550 {
1551         struct charger_desc *desc = cm->desc;
1552         union power_supply_propval val;
1553         int ret;
1554
1555         /* Verify whether fuel gauge provides battery temperature */
1556         ret = fuel_gauge->get_property(fuel_gauge,
1557                                         POWER_SUPPLY_PROP_TEMP, &val);
1558
1559         if (!ret) {
1560                 cm->charger_psy.properties[cm->charger_psy.num_properties] =
1561                                 POWER_SUPPLY_PROP_TEMP;
1562                 cm->charger_psy.num_properties++;
1563                 cm->desc->measure_battery_temp = true;
1564         }
1565 #ifdef CONFIG_THERMAL
1566         if (ret && desc->thermal_zone) {
1567                 cm->tzd_batt =
1568                         thermal_zone_get_zone_by_name(desc->thermal_zone);
1569                 if (IS_ERR(cm->tzd_batt))
1570                         return PTR_ERR(cm->tzd_batt);
1571
1572                 /* Use external thermometer */
1573                 cm->charger_psy.properties[cm->charger_psy.num_properties] =
1574                                 POWER_SUPPLY_PROP_TEMP_AMBIENT;
1575                 cm->charger_psy.num_properties++;
1576                 cm->desc->measure_battery_temp = true;
1577                 ret = 0;
1578         }
1579 #endif
1580         if (cm->desc->measure_battery_temp) {
1581                 /* NOTICE : Default allowable minimum charge temperature is 0 */
1582                 if (!desc->temp_max)
1583                         desc->temp_max = CM_DEFAULT_CHARGE_TEMP_MAX;
1584                 if (!desc->temp_diff)
1585                         desc->temp_diff = CM_DEFAULT_RECHARGE_TEMP_DIFF;
1586         }
1587
1588         return ret;
1589 }
1590
1591 static struct of_device_id charger_manager_match[] = {
1592         {
1593                 .compatible = "charger-manager",
1594         },
1595         {},
1596 };
1597
1598 static struct charger_desc *of_cm_parse_desc(struct device *dev)
1599 {
1600         struct charger_desc *desc;
1601         struct device_node *np = dev->of_node;
1602         u32 poll_mode = CM_POLL_DISABLE;
1603         u32 battery_stat = CM_NO_BATTERY;
1604         int num_chgs = 0;
1605
1606         desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
1607         if (!desc)
1608                 return ERR_PTR(-ENOMEM);
1609
1610         of_property_read_string(np, "cm-name", &desc->psy_name);
1611
1612         of_property_read_u32(np, "cm-poll-mode", &poll_mode);
1613         desc->polling_mode = poll_mode;
1614
1615         of_property_read_u32(np, "cm-poll-interval",
1616                                 &desc->polling_interval_ms);
1617
1618         of_property_read_u32(np, "cm-fullbatt-vchkdrop-ms",
1619                                         &desc->fullbatt_vchkdrop_ms);
1620         of_property_read_u32(np, "cm-fullbatt-vchkdrop-volt",
1621                                         &desc->fullbatt_vchkdrop_uV);
1622         of_property_read_u32(np, "cm-fullbatt-voltage", &desc->fullbatt_uV);
1623         of_property_read_u32(np, "cm-fullbatt-soc", &desc->fullbatt_soc);
1624         of_property_read_u32(np, "cm-fullbatt-capacity",
1625                                         &desc->fullbatt_full_capacity);
1626
1627         of_property_read_u32(np, "cm-battery-stat", &battery_stat);
1628         desc->battery_present = battery_stat;
1629
1630         /* chargers */
1631         of_property_read_u32(np, "cm-num-chargers", &num_chgs);
1632         if (num_chgs) {
1633                 /* Allocate empty bin at the tail of array */
1634                 desc->psy_charger_stat = devm_kzalloc(dev, sizeof(char *)
1635                                                 * (num_chgs + 1), GFP_KERNEL);
1636                 if (desc->psy_charger_stat) {
1637                         int i;
1638                         for (i = 0; i < num_chgs; i++)
1639                                 of_property_read_string_index(np, "cm-chargers",
1640                                                 i, &desc->psy_charger_stat[i]);
1641                 } else {
1642                         return ERR_PTR(-ENOMEM);
1643                 }
1644         }
1645
1646         of_property_read_string(np, "cm-fuel-gauge", &desc->psy_fuel_gauge);
1647
1648         of_property_read_string(np, "cm-thermal-zone", &desc->thermal_zone);
1649
1650         of_property_read_u32(np, "cm-battery-cold", &desc->temp_min);
1651         if (of_get_property(np, "cm-battery-cold-in-minus", NULL))
1652                 desc->temp_min *= -1;
1653         of_property_read_u32(np, "cm-battery-hot", &desc->temp_max);
1654         of_property_read_u32(np, "cm-battery-temp-diff", &desc->temp_diff);
1655
1656         of_property_read_u32(np, "cm-charging-max",
1657                                 &desc->charging_max_duration_ms);
1658         of_property_read_u32(np, "cm-discharging-max",
1659                                 &desc->discharging_max_duration_ms);
1660
1661         /* battery charger regualtors */
1662         desc->num_charger_regulators = of_get_child_count(np);
1663         if (desc->num_charger_regulators) {
1664                 struct charger_regulator *chg_regs;
1665                 struct device_node *child;
1666
1667                 chg_regs = devm_kzalloc(dev, sizeof(*chg_regs)
1668                                         * desc->num_charger_regulators,
1669                                         GFP_KERNEL);
1670                 if (!chg_regs)
1671                         return ERR_PTR(-ENOMEM);
1672
1673                 desc->charger_regulators = chg_regs;
1674
1675                 for_each_child_of_node(np, child) {
1676                         struct charger_cable *cables;
1677                         struct device_node *_child;
1678
1679                         of_property_read_string(child, "cm-regulator-name",
1680                                         &chg_regs->regulator_name);
1681
1682                         /* charger cables */
1683                         chg_regs->num_cables = of_get_child_count(child);
1684                         if (chg_regs->num_cables) {
1685                                 cables = devm_kzalloc(dev, sizeof(*cables)
1686                                                 * chg_regs->num_cables,
1687                                                 GFP_KERNEL);
1688                                 if (!cables)
1689                                         return ERR_PTR(-ENOMEM);
1690
1691                                 chg_regs->cables = cables;
1692
1693                                 for_each_child_of_node(child, _child) {
1694                                         of_property_read_string(_child,
1695                                         "cm-cable-name", &cables->name);
1696                                         of_property_read_string(_child,
1697                                         "cm-cable-extcon",
1698                                         &cables->extcon_name);
1699                                         of_property_read_u32(_child,
1700                                         "cm-cable-min",
1701                                         &cables->min_uA);
1702                                         of_property_read_u32(_child,
1703                                         "cm-cable-max",
1704                                         &cables->max_uA);
1705                                         cables++;
1706                                 }
1707                         }
1708                         chg_regs++;
1709                 }
1710         }
1711         return desc;
1712 }
1713
1714 static inline struct charger_desc *cm_get_drv_data(struct platform_device *pdev)
1715 {
1716         if (pdev->dev.of_node)
1717                 return of_cm_parse_desc(&pdev->dev);
1718         return (struct charger_desc *)dev_get_platdata(&pdev->dev);
1719 }
1720
1721 static int charger_manager_probe(struct platform_device *pdev)
1722 {
1723         struct charger_desc *desc = cm_get_drv_data(pdev);
1724         struct charger_manager *cm;
1725         int ret = 0, i = 0;
1726         int j = 0;
1727         union power_supply_propval val;
1728         struct power_supply *fuel_gauge;
1729
1730         if (g_desc && !rtc_dev && g_desc->rtc_name) {
1731                 rtc_dev = rtc_class_open(g_desc->rtc_name);
1732                 if (IS_ERR_OR_NULL(rtc_dev)) {
1733                         rtc_dev = NULL;
1734                         dev_err(&pdev->dev, "Cannot get RTC %s\n",
1735                                 g_desc->rtc_name);
1736                         return -ENODEV;
1737                 }
1738         }
1739
1740         if (!desc) {
1741                 dev_err(&pdev->dev, "No platform data (desc) found\n");
1742                 return -ENODEV;
1743         }
1744
1745         cm = devm_kzalloc(&pdev->dev,
1746                         sizeof(struct charger_manager), GFP_KERNEL);
1747         if (!cm)
1748                 return -ENOMEM;
1749
1750         /* Basic Values. Unspecified are Null or 0 */
1751         cm->dev = &pdev->dev;
1752         cm->desc = desc;
1753
1754         /*
1755          * The following two do not need to be errors.
1756          * Users may intentionally ignore those two features.
1757          */
1758         if (desc->fullbatt_uV == 0) {
1759                 dev_info(&pdev->dev, "Ignoring full-battery voltage threshold as it is not supplied\n");
1760         }
1761         if (!desc->fullbatt_vchkdrop_ms || !desc->fullbatt_vchkdrop_uV) {
1762                 dev_info(&pdev->dev, "Disabling full-battery voltage drop checking mechanism as it is not supplied\n");
1763                 desc->fullbatt_vchkdrop_ms = 0;
1764                 desc->fullbatt_vchkdrop_uV = 0;
1765         }
1766         if (desc->fullbatt_soc == 0) {
1767                 dev_info(&pdev->dev, "Ignoring full-battery soc(state of charge) threshold as it is not supplied\n");
1768         }
1769         if (desc->fullbatt_full_capacity == 0) {
1770                 dev_info(&pdev->dev, "Ignoring full-battery full capacity threshold as it is not supplied\n");
1771         }
1772
1773         if (!desc->charger_regulators || desc->num_charger_regulators < 1) {
1774                 dev_err(&pdev->dev, "charger_regulators undefined\n");
1775                 return -EINVAL;
1776         }
1777
1778         if (!desc->psy_charger_stat || !desc->psy_charger_stat[0]) {
1779                 dev_err(&pdev->dev, "No power supply defined\n");
1780                 return -EINVAL;
1781         }
1782
1783         if (!desc->psy_fuel_gauge) {
1784                 dev_err(&pdev->dev, "No fuel gauge power supply defined\n");
1785                 return -EINVAL;
1786         }
1787
1788         /* Counting index only */
1789         while (desc->psy_charger_stat[i])
1790                 i++;
1791
1792         /* Check if charger's supplies are present at probe */
1793         for (i = 0; desc->psy_charger_stat[i]; i++) {
1794                 struct power_supply *psy;
1795
1796                 psy = power_supply_get_by_name(desc->psy_charger_stat[i]);
1797                 if (!psy) {
1798                         dev_err(&pdev->dev, "Cannot find power supply \"%s\"\n",
1799                                 desc->psy_charger_stat[i]);
1800                         return -ENODEV;
1801                 }
1802         }
1803
1804         fuel_gauge = power_supply_get_by_name(desc->psy_fuel_gauge);
1805         if (!fuel_gauge) {
1806                 dev_err(&pdev->dev, "Cannot find power supply \"%s\"\n",
1807                         desc->psy_fuel_gauge);
1808                 return -ENODEV;
1809         }
1810
1811         if (desc->polling_interval_ms == 0 ||
1812             msecs_to_jiffies(desc->polling_interval_ms) <= CM_JIFFIES_SMALL) {
1813                 dev_err(&pdev->dev, "polling_interval_ms is too small\n");
1814                 return -EINVAL;
1815         }
1816
1817         if (!desc->charging_max_duration_ms ||
1818                         !desc->discharging_max_duration_ms) {
1819                 dev_info(&pdev->dev, "Cannot limit charging duration checking mechanism to prevent overcharge/overheat and control discharging duration\n");
1820                 desc->charging_max_duration_ms = 0;
1821                 desc->discharging_max_duration_ms = 0;
1822         }
1823
1824         platform_set_drvdata(pdev, cm);
1825
1826         memcpy(&cm->charger_psy, &psy_default, sizeof(psy_default));
1827
1828         if (!desc->psy_name)
1829                 strncpy(cm->psy_name_buf, psy_default.name, PSY_NAME_MAX);
1830         else
1831                 strncpy(cm->psy_name_buf, desc->psy_name, PSY_NAME_MAX);
1832         cm->charger_psy.name = cm->psy_name_buf;
1833
1834         /* Allocate for psy properties because they may vary */
1835         cm->charger_psy.properties = devm_kzalloc(&pdev->dev,
1836                                 sizeof(enum power_supply_property)
1837                                 * (ARRAY_SIZE(default_charger_props) +
1838                                 NUM_CHARGER_PSY_OPTIONAL), GFP_KERNEL);
1839         if (!cm->charger_psy.properties)
1840                 return -ENOMEM;
1841
1842         memcpy(cm->charger_psy.properties, default_charger_props,
1843                 sizeof(enum power_supply_property) *
1844                 ARRAY_SIZE(default_charger_props));
1845         cm->charger_psy.num_properties = psy_default.num_properties;
1846
1847         /* Find which optional psy-properties are available */
1848         if (!fuel_gauge->get_property(fuel_gauge,
1849                                           POWER_SUPPLY_PROP_CHARGE_NOW, &val)) {
1850                 cm->charger_psy.properties[cm->charger_psy.num_properties] =
1851                                 POWER_SUPPLY_PROP_CHARGE_NOW;
1852                 cm->charger_psy.num_properties++;
1853         }
1854         if (!fuel_gauge->get_property(fuel_gauge,
1855                                           POWER_SUPPLY_PROP_CURRENT_NOW,
1856                                           &val)) {
1857                 cm->charger_psy.properties[cm->charger_psy.num_properties] =
1858                                 POWER_SUPPLY_PROP_CURRENT_NOW;
1859                 cm->charger_psy.num_properties++;
1860         }
1861
1862         ret = cm_init_thermal_data(cm, fuel_gauge);
1863         if (ret) {
1864                 dev_err(&pdev->dev, "Failed to initialize thermal data\n");
1865                 cm->desc->measure_battery_temp = false;
1866         }
1867
1868         INIT_DELAYED_WORK(&cm->fullbatt_vchk_work, fullbatt_vchk);
1869
1870         ret = power_supply_register(NULL, &cm->charger_psy);
1871         if (ret) {
1872                 dev_err(&pdev->dev, "Cannot register charger-manager with name \"%s\"\n",
1873                         cm->charger_psy.name);
1874                 return ret;
1875         }
1876
1877         /* Register extcon device for charger cable */
1878         ret = charger_manager_register_extcon(cm);
1879         if (ret < 0) {
1880                 dev_err(&pdev->dev, "Cannot initialize extcon device\n");
1881                 goto err_reg_extcon;
1882         }
1883
1884         /* Register sysfs entry for charger(regulator) */
1885         ret = charger_manager_register_sysfs(cm);
1886         if (ret < 0) {
1887                 dev_err(&pdev->dev,
1888                         "Cannot initialize sysfs entry of regulator\n");
1889                 goto err_reg_sysfs;
1890         }
1891
1892         /* Add to the list */
1893         mutex_lock(&cm_list_mtx);
1894         list_add(&cm->entry, &cm_list);
1895         mutex_unlock(&cm_list_mtx);
1896
1897         /*
1898          * Charger-manager is capable of waking up the systme from sleep
1899          * when event is happend through cm_notify_event()
1900          */
1901         device_init_wakeup(&pdev->dev, true);
1902         device_set_wakeup_capable(&pdev->dev, false);
1903
1904         schedule_work(&setup_polling);
1905
1906         return 0;
1907
1908 err_reg_sysfs:
1909         for (i = 0; i < desc->num_charger_regulators; i++) {
1910                 struct charger_regulator *charger;
1911
1912                 charger = &desc->charger_regulators[i];
1913                 sysfs_remove_group(&cm->charger_psy.dev->kobj,
1914                                 &charger->attr_g);
1915         }
1916 err_reg_extcon:
1917         for (i = 0; i < desc->num_charger_regulators; i++) {
1918                 struct charger_regulator *charger;
1919
1920                 charger = &desc->charger_regulators[i];
1921                 for (j = 0; j < charger->num_cables; j++) {
1922                         struct charger_cable *cable = &charger->cables[j];
1923                         /* Remove notifier block if only edev exists */
1924                         if (cable->extcon_dev.edev)
1925                                 extcon_unregister_interest(&cable->extcon_dev);
1926                 }
1927
1928                 regulator_put(desc->charger_regulators[i].consumer);
1929         }
1930
1931         power_supply_unregister(&cm->charger_psy);
1932
1933         return ret;
1934 }
1935
1936 static int charger_manager_remove(struct platform_device *pdev)
1937 {
1938         struct charger_manager *cm = platform_get_drvdata(pdev);
1939         struct charger_desc *desc = cm->desc;
1940         int i = 0;
1941         int j = 0;
1942
1943         /* Remove from the list */
1944         mutex_lock(&cm_list_mtx);
1945         list_del(&cm->entry);
1946         mutex_unlock(&cm_list_mtx);
1947
1948         cancel_work_sync(&setup_polling);
1949         cancel_delayed_work_sync(&cm_monitor_work);
1950
1951         for (i = 0 ; i < desc->num_charger_regulators ; i++) {
1952                 struct charger_regulator *charger
1953                                 = &desc->charger_regulators[i];
1954                 for (j = 0 ; j < charger->num_cables ; j++) {
1955                         struct charger_cable *cable = &charger->cables[j];
1956                         extcon_unregister_interest(&cable->extcon_dev);
1957                 }
1958         }
1959
1960         for (i = 0 ; i < desc->num_charger_regulators ; i++)
1961                 regulator_put(desc->charger_regulators[i].consumer);
1962
1963         power_supply_unregister(&cm->charger_psy);
1964
1965         try_charger_enable(cm, false);
1966
1967         return 0;
1968 }
1969
1970 static const struct platform_device_id charger_manager_id[] = {
1971         { "charger-manager", 0 },
1972         { },
1973 };
1974 MODULE_DEVICE_TABLE(platform, charger_manager_id);
1975
1976 static int cm_suspend_noirq(struct device *dev)
1977 {
1978         int ret = 0;
1979
1980         if (device_may_wakeup(dev)) {
1981                 device_set_wakeup_capable(dev, false);
1982                 ret = -EAGAIN;
1983         }
1984
1985         return ret;
1986 }
1987
1988 static int cm_suspend_prepare(struct device *dev)
1989 {
1990         struct charger_manager *cm = dev_get_drvdata(dev);
1991
1992         if (!cm_suspended) {
1993                 if (rtc_dev) {
1994                         struct rtc_time tmp;
1995                         unsigned long now;
1996
1997                         rtc_read_alarm(rtc_dev, &rtc_wkalarm_save);
1998                         rtc_read_time(rtc_dev, &tmp);
1999
2000                         if (rtc_wkalarm_save.enabled) {
2001                                 rtc_tm_to_time(&rtc_wkalarm_save.time,
2002                                                &rtc_wkalarm_save_time);
2003                                 rtc_tm_to_time(&tmp, &now);
2004                                 if (now > rtc_wkalarm_save_time)
2005                                         rtc_wkalarm_save_time = 0;
2006                         } else {
2007                                 rtc_wkalarm_save_time = 0;
2008                         }
2009                 }
2010                 cm_suspended = true;
2011         }
2012
2013         cancel_delayed_work(&cm->fullbatt_vchk_work);
2014         cm->status_save_ext_pwr_inserted = is_ext_pwr_online(cm);
2015         cm->status_save_batt = is_batt_present(cm);
2016
2017         if (!cm_rtc_set) {
2018                 cm_suspend_duration_ms = 0;
2019                 cm_rtc_set = cm_setup_timer();
2020         }
2021
2022         return 0;
2023 }
2024
2025 static void cm_suspend_complete(struct device *dev)
2026 {
2027         struct charger_manager *cm = dev_get_drvdata(dev);
2028
2029         if (cm_suspended) {
2030                 if (rtc_dev) {
2031                         struct rtc_wkalrm tmp;
2032
2033                         rtc_read_alarm(rtc_dev, &tmp);
2034                         rtc_wkalarm_save.pending = tmp.pending;
2035                         rtc_set_alarm(rtc_dev, &rtc_wkalarm_save);
2036                 }
2037                 cm_suspended = false;
2038                 cm_rtc_set = false;
2039         }
2040
2041         /* Re-enqueue delayed work (fullbatt_vchk_work) */
2042         if (cm->fullbatt_vchk_jiffies_at) {
2043                 unsigned long delay = 0;
2044                 unsigned long now = jiffies + CM_JIFFIES_SMALL;
2045
2046                 if (time_after_eq(now, cm->fullbatt_vchk_jiffies_at)) {
2047                         delay = (unsigned long)((long)now
2048                                 - (long)(cm->fullbatt_vchk_jiffies_at));
2049                         delay = jiffies_to_msecs(delay);
2050                 } else {
2051                         delay = 0;
2052                 }
2053
2054                 /*
2055                  * Account for cm_suspend_duration_ms if
2056                  * assume_timer_stops_in_suspend is active
2057                  */
2058                 if (g_desc && g_desc->assume_timer_stops_in_suspend) {
2059                         if (delay > cm_suspend_duration_ms)
2060                                 delay -= cm_suspend_duration_ms;
2061                         else
2062                                 delay = 0;
2063                 }
2064
2065                 queue_delayed_work(cm_wq, &cm->fullbatt_vchk_work,
2066                                    msecs_to_jiffies(delay));
2067         }
2068         device_set_wakeup_capable(cm->dev, false);
2069         uevent_notify(cm, NULL);
2070 }
2071
2072 static const struct dev_pm_ops charger_manager_pm = {
2073         .prepare        = cm_suspend_prepare,
2074         .suspend_noirq  = cm_suspend_noirq,
2075         .complete       = cm_suspend_complete,
2076 };
2077
2078 static struct platform_driver charger_manager_driver = {
2079         .driver = {
2080                 .name = "charger-manager",
2081                 .owner = THIS_MODULE,
2082                 .pm = &charger_manager_pm,
2083                 .of_match_table = charger_manager_match,
2084         },
2085         .probe = charger_manager_probe,
2086         .remove = charger_manager_remove,
2087         .id_table = charger_manager_id,
2088 };
2089
2090 static int __init charger_manager_init(void)
2091 {
2092         cm_wq = create_freezable_workqueue("charger_manager");
2093         INIT_DELAYED_WORK(&cm_monitor_work, cm_monitor_poller);
2094
2095         return platform_driver_register(&charger_manager_driver);
2096 }
2097 late_initcall(charger_manager_init);
2098
2099 static void __exit charger_manager_cleanup(void)
2100 {
2101         destroy_workqueue(cm_wq);
2102         cm_wq = NULL;
2103
2104         platform_driver_unregister(&charger_manager_driver);
2105 }
2106 module_exit(charger_manager_cleanup);
2107
2108 /**
2109  * find_power_supply - find the associated power_supply of charger
2110  * @cm: the Charger Manager representing the battery
2111  * @psy: pointer to instance of charger's power_supply
2112  */
2113 static bool find_power_supply(struct charger_manager *cm,
2114                         struct power_supply *psy)
2115 {
2116         int i;
2117         bool found = false;
2118
2119         for (i = 0; cm->desc->psy_charger_stat[i]; i++) {
2120                 if (!strcmp(psy->name, cm->desc->psy_charger_stat[i])) {
2121                         found = true;
2122                         break;
2123                 }
2124         }
2125
2126         return found;
2127 }
2128
2129 /**
2130  * cm_notify_event - charger driver notify Charger Manager of charger event
2131  * @psy: pointer to instance of charger's power_supply
2132  * @type: type of charger event
2133  * @msg: optional message passed to uevent_notify fuction
2134  */
2135 void cm_notify_event(struct power_supply *psy, enum cm_event_types type,
2136                      char *msg)
2137 {
2138         struct charger_manager *cm;
2139         bool found_power_supply = false;
2140
2141         if (psy == NULL)
2142                 return;
2143
2144         mutex_lock(&cm_list_mtx);
2145         list_for_each_entry(cm, &cm_list, entry) {
2146                 found_power_supply = find_power_supply(cm, psy);
2147                 if (found_power_supply)
2148                         break;
2149         }
2150         mutex_unlock(&cm_list_mtx);
2151
2152         if (!found_power_supply)
2153                 return;
2154
2155         switch (type) {
2156         case CM_EVENT_BATT_FULL:
2157                 fullbatt_handler(cm);
2158                 break;
2159         case CM_EVENT_BATT_OUT:
2160                 battout_handler(cm);
2161                 break;
2162         case CM_EVENT_BATT_IN:
2163         case CM_EVENT_EXT_PWR_IN_OUT ... CM_EVENT_CHG_START_STOP:
2164                 misc_event_handler(cm, type);
2165                 break;
2166         case CM_EVENT_UNKNOWN:
2167         case CM_EVENT_OTHERS:
2168                 uevent_notify(cm, msg ? msg : default_event_names[type]);
2169                 break;
2170         default:
2171                 dev_err(cm->dev, "%s: type not specified\n", __func__);
2172                 break;
2173         }
2174 }
2175 EXPORT_SYMBOL_GPL(cm_notify_event);
2176
2177 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
2178 MODULE_DESCRIPTION("Charger Manager");
2179 MODULE_LICENSE("GPL");