Pileus Git - ~andy/linux/blob - 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 #include <linux/io.h>
  16 #include <linux/module.h>
  17 #include <linux/irq.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/rtc.h>
  20 #include <linux/slab.h>
  21 #include <linux/workqueue.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/power/charger-manager.h>
  24 #include <linux/regulator/consumer.h>
  25
  26 static const char * const default_event_names[] = {
  27         [CM_EVENT_UNKNOWN] = "Unknown",
  28         [CM_EVENT_BATT_FULL] = "Battery Full",
  29         [CM_EVENT_BATT_IN] = "Battery Inserted",
  30         [CM_EVENT_BATT_OUT] = "Battery Pulled Out",
  31         [CM_EVENT_EXT_PWR_IN_OUT] = "External Power Attach/Detach",
  32         [CM_EVENT_CHG_START_STOP] = "Charging Start/Stop",
  33         [CM_EVENT_OTHERS] = "Other battery events"
  34 };
  35
  36 /*
  37  * Regard CM_JIFFIES_SMALL jiffies is small enough to ignore for
  38  * delayed works so that we can run delayed works with CM_JIFFIES_SMALL
  39  * without any delays.
  40  */
  41 #define CM_JIFFIES_SMALL        (2)
  42
  43 /* If y is valid (> 0) and smaller than x, do x = y */
  44 #define CM_MIN_VALID(x, y)      x = (((y > 0) && ((x) > (y))) ? (y) : (x))
  45
  46 /*
  47  * Regard CM_RTC_SMALL (sec) is small enough to ignore error in invoking
  48  * rtc alarm. It should be 2 or larger
  49  */
  50 #define CM_RTC_SMALL            (2)
  51
  52 #define UEVENT_BUF_SIZE         32
  53
  54 static LIST_HEAD(cm_list);
  55 static DEFINE_MUTEX(cm_list_mtx);
  56
  57 /* About in-suspend (suspend-again) monitoring */
  58 static struct rtc_device *rtc_dev;
  59 /*
  60  * Backup RTC alarm
  61  * Save the wakeup alarm before entering suspend-to-RAM
  62  */
  63 static struct rtc_wkalrm rtc_wkalarm_save;
  64 /* Backup RTC alarm time in terms of seconds since 01-01-1970 00:00:00 */
  65 static unsigned long rtc_wkalarm_save_time;
  66 static bool cm_suspended;
  67 static bool cm_rtc_set;
  68 static unsigned long cm_suspend_duration_ms;
  69
  70 /* About normal (not suspended) monitoring */
  71 static unsigned long polling_jiffy = ULONG_MAX; /* ULONG_MAX: no polling */
  72 static unsigned long next_polling; /* Next appointed polling time */
  73 static struct workqueue_struct *cm_wq; /* init at driver add */
  74 static struct delayed_work cm_monitor_work; /* init at driver add */
  75
  76 /* Global charger-manager description */
  77 static struct charger_global_desc *g_desc; /* init with setup_charger_manager */
  78
  79 /**
  80  * is_batt_present - See if the battery presents in place.
  81  * @cm: the Charger Manager representing the battery.
  82  */
  83 static bool is_batt_present(struct charger_manager *cm)
  84 {
  85         union power_supply_propval val;
  86         bool present = false;
  87         int i, ret;
  88
  89         switch (cm->desc->battery_present) {
  90         case CM_BATTERY_PRESENT:
  91                 present = true;
  92                 break;
  93         case CM_NO_BATTERY:
  94                 break;
  95         case CM_FUEL_GAUGE:
  96                 ret = cm->fuel_gauge->get_property(cm->fuel_gauge,
  97                                 POWER_SUPPLY_PROP_PRESENT, &val);
  98                 if (ret == 0 && val.intval)
  99                         present = true;
 100                 break;
 101         case CM_CHARGER_STAT:
 102                 for (i = 0; cm->charger_stat[i]; i++) {
 103                         ret = cm->charger_stat[i]->get_property(
 104                                         cm->charger_stat[i],
 105                                         POWER_SUPPLY_PROP_PRESENT, &val);
 106                         if (ret == 0 && val.intval) {
 107                                 present = true;
 108                                 break;
 109                         }
 110                 }
 111                 break;
 112         }
 113
 114         return present;
 115 }
 116
 117 /**
 118  * is_ext_pwr_online - See if an external power source is attached to charge
 119  * @cm: the Charger Manager representing the battery.
 120  *
 121  * Returns true if at least one of the chargers of the battery has an external
 122  * power source attached to charge the battery regardless of whether it is
 123  * actually charging or not.
 124  */
 125 static bool is_ext_pwr_online(struct charger_manager *cm)
 126 {
 127         union power_supply_propval val;
 128         bool online = false;
 129         int i, ret;
 130
 131         /* If at least one of them has one, it's yes. */
 132         for (i = 0; cm->charger_stat[i]; i++) {
 133                 ret = cm->charger_stat[i]->get_property(
 134                                 cm->charger_stat[i],
 135                                 POWER_SUPPLY_PROP_ONLINE, &val);
 136                 if (ret == 0 && val.intval) {
 137                         online = true;
 138                         break;
 139                 }
 140         }
 141
 142         return online;
 143 }
 144
 145 /**
 146  * get_batt_uV - Get the voltage level of the battery
 147  * @cm: the Charger Manager representing the battery.
 148  * @uV: the voltage level returned.
 149  *
 150  * Returns 0 if there is no error.
 151  * Returns a negative value on error.
 152  */
 153 static int get_batt_uV(struct charger_manager *cm, int *uV)
 154 {
 155         union power_supply_propval val;
 156         int ret;
 157
 158         if (!cm->fuel_gauge)
 159                 return -ENODEV;
 160
 161         ret = cm->fuel_gauge->get_property(cm->fuel_gauge,
 162                                 POWER_SUPPLY_PROP_VOLTAGE_NOW, &val);
 163         if (ret)
 164                 return ret;
 165
 166         *uV = val.intval;
 167         return 0;
 168 }
 169
 170 /**
 171  * is_charging - Returns true if the battery is being charged.
 172  * @cm: the Charger Manager representing the battery.
 173  */
 174 static bool is_charging(struct charger_manager *cm)
 175 {
 176         int i, ret;
 177         bool charging = false;
 178         union power_supply_propval val;
 179
 180         /* If there is no battery, it cannot be charged */
 181         if (!is_batt_present(cm))
 182                 return false;
 183
 184         /* If at least one of the charger is charging, return yes */
 185         for (i = 0; cm->charger_stat[i]; i++) {
 186                 /* 1. The charger sholuld not be DISABLED */
 187                 if (cm->emergency_stop)
 188                         continue;
 189                 if (!cm->charger_enabled)
 190                         continue;
 191
 192                 /* 2. The charger should be online (ext-power) */
 193                 ret = cm->charger_stat[i]->get_property(
 194                                 cm->charger_stat[i],
 195                                 POWER_SUPPLY_PROP_ONLINE, &val);
 196                 if (ret) {
 197                         dev_warn(cm->dev, "Cannot read ONLINE value from %s.\n",
 198                                         cm->desc->psy_charger_stat[i]);
 199                         continue;
 200                 }
 201                 if (val.intval == 0)
 202                         continue;
 203
 204                 /*
 205                  * 3. The charger should not be FULL, DISCHARGING,
 206                  * or NOT_CHARGING.
 207                  */
 208                 ret = cm->charger_stat[i]->get_property(
 209                                 cm->charger_stat[i],
 210                                 POWER_SUPPLY_PROP_STATUS, &val);
 211                 if (ret) {
 212                         dev_warn(cm->dev, "Cannot read STATUS value from %s.\n",
 213                                         cm->desc->psy_charger_stat[i]);
 214                         continue;
 215                 }
 216                 if (val.intval == POWER_SUPPLY_STATUS_FULL ||
 217                                 val.intval == POWER_SUPPLY_STATUS_DISCHARGING ||
 218                                 val.intval == POWER_SUPPLY_STATUS_NOT_CHARGING)
 219                         continue;
 220
 221                 /* Then, this is charging. */
 222                 charging = true;
 223                 break;
 224         }
 225
 226         return charging;
 227 }
 228
 229 /**
 230  * is_polling_required - Return true if need to continue polling for this CM.
 231  * @cm: the Charger Manager representing the battery.
 232  */
 233 static bool is_polling_required(struct charger_manager *cm)
 234 {
 235         switch (cm->desc->polling_mode) {
 236         case CM_POLL_DISABLE:
 237                 return false;
 238         case CM_POLL_ALWAYS:
 239                 return true;
 240         case CM_POLL_EXTERNAL_POWER_ONLY:
 241                 return is_ext_pwr_online(cm);
 242         case CM_POLL_CHARGING_ONLY:
 243                 return is_charging(cm);
 244         default:
 245                 dev_warn(cm->dev, "Incorrect polling_mode (%d)\n",
 246                         cm->desc->polling_mode);
 247         }
 248
 249         return false;
 250 }
 251
 252 /**
 253  * try_charger_enable - Enable/Disable chargers altogether
 254  * @cm: the Charger Manager representing the battery.
 255  * @enable: true: enable / false: disable
 256  *
 257  * Note that Charger Manager keeps the charger enabled regardless whether
 258  * the charger is charging or not (because battery is full or no external
 259  * power source exists) except when CM needs to disable chargers forcibly
 260  * bacause of emergency causes; when the battery is overheated or too cold.
 261  */
 262 static int try_charger_enable(struct charger_manager *cm, bool enable)
 263 {
 264         int err = 0, i;
 265         struct charger_desc *desc = cm->desc;
 266
 267         /* Ignore if it's redundent command */
 268         if (enable == cm->charger_enabled)
 269                 return 0;
 270
 271         if (enable) {
 272                 if (cm->emergency_stop)
 273                         return -EAGAIN;
 274                 for (i = 0 ; i < desc->num_charger_regulators ; i++)
 275                         regulator_enable(desc->charger_regulators[i].consumer);
 276         } else {
 277                 /*
 278                  * Abnormal battery state - Stop charging forcibly,
 279                  * even if charger was enabled at the other places
 280                  */
 281                 for (i = 0; i < desc->num_charger_regulators; i++) {
 282                         if (regulator_is_enabled(
 283                                     desc->charger_regulators[i].consumer)) {
 284                                 regulator_force_disable(
 285                                         desc->charger_regulators[i].consumer);
 286                                 dev_warn(cm->dev,
 287                                         "Disable regulator(%s) forcibly.\n",
 288                                         desc->charger_regulators[i].regulator_name);
 289                         }
 290                 }
 291         }
 292
 293         if (!err)
 294                 cm->charger_enabled = enable;
 295
 296         return err;
 297 }
 298
 299 /**
 300  * try_charger_restart - Restart charging.
 301  * @cm: the Charger Manager representing the battery.
 302  *
 303  * Restart charging by turning off and on the charger.
 304  */
 305 static int try_charger_restart(struct charger_manager *cm)
 306 {
 307         int err;
 308
 309         if (cm->emergency_stop)
 310                 return -EAGAIN;
 311
 312         err = try_charger_enable(cm, false);
 313         if (err)
 314                 return err;
 315
 316         return try_charger_enable(cm, true);
 317 }
 318
 319 /**
 320  * uevent_notify - Let users know something has changed.
 321  * @cm: the Charger Manager representing the battery.
 322  * @event: the event string.
 323  *
 324  * If @event is null, it implies that uevent_notify is called
 325  * by resume function. When called in the resume function, cm_suspended
 326  * should be already reset to false in order to let uevent_notify
 327  * notify the recent event during the suspend to users. While
 328  * suspended, uevent_notify does not notify users, but tracks
 329  * events so that uevent_notify can notify users later after resumed.
 330  */
 331 static void uevent_notify(struct charger_manager *cm, const char *event)
 332 {
 333         static char env_str[UEVENT_BUF_SIZE + 1] = "";
 334         static char env_str_save[UEVENT_BUF_SIZE + 1] = "";
 335
 336         if (cm_suspended) {
 337                 /* Nothing in suspended-event buffer */
 338                 if (env_str_save[0] == 0) {
 339                         if (!strncmp(env_str, event, UEVENT_BUF_SIZE))
 340                                 return; /* status not changed */
 341                         strncpy(env_str_save, event, UEVENT_BUF_SIZE);
 342                         return;
 343                 }
 344
 345                 if (!strncmp(env_str_save, event, UEVENT_BUF_SIZE))
 346                         return; /* Duplicated. */
 347                 strncpy(env_str_save, event, UEVENT_BUF_SIZE);
 348                 return;
 349         }
 350
 351         if (event == NULL) {
 352                 /* No messages pending */
 353                 if (!env_str_save[0])
 354                         return;
 355
 356                 strncpy(env_str, env_str_save, UEVENT_BUF_SIZE);
 357                 kobject_uevent(&cm->dev->kobj, KOBJ_CHANGE);
 358                 env_str_save[0] = 0;
 359
 360                 return;
 361         }
 362
 363         /* status not changed */
 364         if (!strncmp(env_str, event, UEVENT_BUF_SIZE))
 365                 return;
 366
 367         /* save the status and notify the update */
 368         strncpy(env_str, event, UEVENT_BUF_SIZE);
 369         kobject_uevent(&cm->dev->kobj, KOBJ_CHANGE);
 370
 371         dev_info(cm->dev, event);
 372 }
 373
 374 /**
 375  * fullbatt_vchk - Check voltage drop some times after "FULL" event.
 376  * @work: the work_struct appointing the function
 377  *
 378  * If a user has designated "fullbatt_vchkdrop_ms/uV" values with
 379  * charger_desc, Charger Manager checks voltage drop after the battery
 380  * "FULL" event. It checks whether the voltage has dropped more than
 381  * fullbatt_vchkdrop_uV by calling this function after fullbatt_vchkrop_ms.
 382  */
 383 static void fullbatt_vchk(struct work_struct *work)
 384 {
 385         struct delayed_work *dwork = to_delayed_work(work);
 386         struct charger_manager *cm = container_of(dwork,
 387                         struct charger_manager, fullbatt_vchk_work);
 388         struct charger_desc *desc = cm->desc;
 389         int batt_uV, err, diff;
 390
 391         /* remove the appointment for fullbatt_vchk */
 392         cm->fullbatt_vchk_jiffies_at = 0;
 393
 394         if (!desc->fullbatt_vchkdrop_uV || !desc->fullbatt_vchkdrop_ms)
 395                 return;
 396
 397         err = get_batt_uV(cm, &batt_uV);
 398         if (err) {
 399                 dev_err(cm->dev, "%s: get_batt_uV error(%d).\n", __func__, err);
 400                 return;
 401         }
 402
 403         diff = cm->fullbatt_vchk_uV;
 404         diff -= batt_uV;
 405
 406         dev_dbg(cm->dev, "VBATT dropped %duV after full-batt.\n", diff);
 407
 408         if (diff > desc->fullbatt_vchkdrop_uV) {
 409                 try_charger_restart(cm);
 410                 uevent_notify(cm, "Recharge");
 411         }
 412 }
 413
 414 /**
 415  * _cm_monitor - Monitor the temperature and return true for exceptions.
 416  * @cm: the Charger Manager representing the battery.
 417  *
 418  * Returns true if there is an event to notify for the battery.
 419  * (True if the status of "emergency_stop" changes)
 420  */
 421 static bool _cm_monitor(struct charger_manager *cm)
 422 {
 423         struct charger_desc *desc = cm->desc;
 424         int temp = desc->temperature_out_of_range(&cm->last_temp_mC);
 425
 426         dev_dbg(cm->dev, "monitoring (%2.2d.%3.3dC)\n",
 427                 cm->last_temp_mC / 1000, cm->last_temp_mC % 1000);
 428
 429         /* It has been stopped or charging already */
 430         if (!!temp == !!cm->emergency_stop)
 431                 return false;
 432
 433         if (temp) {
 434                 cm->emergency_stop = temp;
 435                 if (!try_charger_enable(cm, false)) {
 436                         if (temp > 0)
 437                                 uevent_notify(cm, "OVERHEAT");
 438                         else
 439                                 uevent_notify(cm, "COLD");
 440                 }
 441         } else {
 442                 cm->emergency_stop = 0;
 443                 if (!try_charger_enable(cm, true))
 444                         uevent_notify(cm, "CHARGING");
 445         }
 446
 447         return true;
 448 }
 449
 450 /**
 451  * cm_monitor - Monitor every battery.
 452  *
 453  * Returns true if there is an event to notify from any of the batteries.
 454  * (True if the status of "emergency_stop" changes)
 455  */
 456 static bool cm_monitor(void)
 457 {
 458         bool stop = false;
 459         struct charger_manager *cm;
 460
 461         mutex_lock(&cm_list_mtx);
 462
 463         list_for_each_entry(cm, &cm_list, entry) {
 464                 if (_cm_monitor(cm))
 465                         stop = true;
 466         }
 467
 468         mutex_unlock(&cm_list_mtx);
 469
 470         return stop;
 471 }
 472
 473 /**
 474  * _setup_polling - Setup the next instance of polling.
 475  * @work: work_struct of the function _setup_polling.
 476  */
 477 static void _setup_polling(struct work_struct *work)
 478 {
 479         unsigned long min = ULONG_MAX;
 480         struct charger_manager *cm;
 481         bool keep_polling = false;
 482         unsigned long _next_polling;
 483
 484         mutex_lock(&cm_list_mtx);
 485
 486         list_for_each_entry(cm, &cm_list, entry) {
 487                 if (is_polling_required(cm) && cm->desc->polling_interval_ms) {
 488                         keep_polling = true;
 489
 490                         if (min > cm->desc->polling_interval_ms)
 491                                 min = cm->desc->polling_interval_ms;
 492                 }
 493         }
 494
 495         polling_jiffy = msecs_to_jiffies(min);
 496         if (polling_jiffy <= CM_JIFFIES_SMALL)
 497                 polling_jiffy = CM_JIFFIES_SMALL + 1;
 498
 499         if (!keep_polling)
 500                 polling_jiffy = ULONG_MAX;
 501         if (polling_jiffy == ULONG_MAX)
 502                 goto out;
 503
 504         WARN(cm_wq == NULL, "charger-manager: workqueue not initialized"
 505                             ". try it later. %s\n", __func__);
 506
 507         _next_polling = jiffies + polling_jiffy;
 508
 509         if (!delayed_work_pending(&cm_monitor_work) ||
 510             (delayed_work_pending(&cm_monitor_work) &&
 511              time_after(next_polling, _next_polling))) {
 512                 cancel_delayed_work_sync(&cm_monitor_work);
 513                 next_polling = jiffies + polling_jiffy;
 514                 queue_delayed_work(cm_wq, &cm_monitor_work, polling_jiffy);
 515         }
 516
 517 out:
 518         mutex_unlock(&cm_list_mtx);
 519 }
 520 static DECLARE_WORK(setup_polling, _setup_polling);
 521
 522 /**
 523  * cm_monitor_poller - The Monitor / Poller.
 524  * @work: work_struct of the function cm_monitor_poller
 525  *
 526  * During non-suspended state, cm_monitor_poller is used to poll and monitor
 527  * the batteries.
 528  */
 529 static void cm_monitor_poller(struct work_struct *work)
 530 {
 531         cm_monitor();
 532         schedule_work(&setup_polling);
 533 }
 534
 535 /**
 536  * fullbatt_handler - Event handler for CM_EVENT_BATT_FULL
 537  * @cm: the Charger Manager representing the battery.
 538  */
 539 static void fullbatt_handler(struct charger_manager *cm)
 540 {
 541         struct charger_desc *desc = cm->desc;
 542
 543         if (!desc->fullbatt_vchkdrop_uV || !desc->fullbatt_vchkdrop_ms)
 544                 goto out;
 545
 546         if (cm_suspended)
 547                 device_set_wakeup_capable(cm->dev, true);
 548
 549         if (delayed_work_pending(&cm->fullbatt_vchk_work))
 550                 cancel_delayed_work(&cm->fullbatt_vchk_work);
 551         queue_delayed_work(cm_wq, &cm->fullbatt_vchk_work,
 552                            msecs_to_jiffies(desc->fullbatt_vchkdrop_ms));
 553         cm->fullbatt_vchk_jiffies_at = jiffies + msecs_to_jiffies(
 554                                        desc->fullbatt_vchkdrop_ms);
 555
 556         if (cm->fullbatt_vchk_jiffies_at == 0)
 557                 cm->fullbatt_vchk_jiffies_at = 1;
 558
 559 out:
 560         dev_info(cm->dev, "EVENT_HANDLE: Battery Fully Charged.\n");
 561         uevent_notify(cm, default_event_names[CM_EVENT_BATT_FULL]);
 562 }
 563
 564 /**
 565  * battout_handler - Event handler for CM_EVENT_BATT_OUT
 566  * @cm: the Charger Manager representing the battery.
 567  */
 568 static void battout_handler(struct charger_manager *cm)
 569 {
 570         if (cm_suspended)
 571                 device_set_wakeup_capable(cm->dev, true);
 572
 573         if (!is_batt_present(cm)) {
 574                 dev_emerg(cm->dev, "Battery Pulled Out!\n");
 575                 uevent_notify(cm, default_event_names[CM_EVENT_BATT_OUT]);
 576         } else {
 577                 uevent_notify(cm, "Battery Reinserted?");
 578         }
 579 }
 580
 581 /**
 582  * misc_event_handler - Handler for other evnets
 583  * @cm: the Charger Manager representing the battery.
 584  * @type: the Charger Manager representing the battery.
 585  */
 586 static void misc_event_handler(struct charger_manager *cm,
 587                         enum cm_event_types type)
 588 {
 589         if (cm_suspended)
 590                 device_set_wakeup_capable(cm->dev, true);
 591
 592         if (!delayed_work_pending(&cm_monitor_work) &&
 593             is_polling_required(cm) && cm->desc->polling_interval_ms)
 594                 schedule_work(&setup_polling);
 595         uevent_notify(cm, default_event_names[type]);
 596 }
 597
 598 static int charger_get_property(struct power_supply *psy,
 599                 enum power_supply_property psp,
 600                 union power_supply_propval *val)
 601 {
 602         struct charger_manager *cm = container_of(psy,
 603                         struct charger_manager, charger_psy);
 604         struct charger_desc *desc = cm->desc;
 605         int ret = 0;
 606         int uV;
 607
 608         switch (psp) {
 609         case POWER_SUPPLY_PROP_STATUS:
 610                 if (is_charging(cm))
 611                         val->intval = POWER_SUPPLY_STATUS_CHARGING;
 612                 else if (is_ext_pwr_online(cm))
 613                         val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
 614                 else
 615                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 616                 break;
 617         case POWER_SUPPLY_PROP_HEALTH:
 618                 if (cm->emergency_stop > 0)
 619                         val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
 620                 else if (cm->emergency_stop < 0)
 621                         val->intval = POWER_SUPPLY_HEALTH_COLD;
 622                 else
 623                         val->intval = POWER_SUPPLY_HEALTH_GOOD;
 624                 break;
 625         case POWER_SUPPLY_PROP_PRESENT:
 626                 if (is_batt_present(cm))
 627                         val->intval = 1;
 628                 else
 629                         val->intval = 0;
 630                 break;
 631         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 632                 ret = get_batt_uV(cm, &val->intval);
 633                 break;
 634         case POWER_SUPPLY_PROP_CURRENT_NOW:
 635                 ret = cm->fuel_gauge->get_property(cm->fuel_gauge,
 636                                 POWER_SUPPLY_PROP_CURRENT_NOW, val);
 637                 break;
 638         case POWER_SUPPLY_PROP_TEMP:
 639                 /* in thenth of centigrade */
 640                 if (cm->last_temp_mC == INT_MIN)
 641                         desc->temperature_out_of_range(&cm->last_temp_mC);
 642                 val->intval = cm->last_temp_mC / 100;
 643                 if (!desc->measure_battery_temp)
 644                         ret = -ENODEV;
 645                 break;
 646         case POWER_SUPPLY_PROP_TEMP_AMBIENT:
 647                 /* in thenth of centigrade */
 648                 if (cm->last_temp_mC == INT_MIN)
 649                         desc->temperature_out_of_range(&cm->last_temp_mC);
 650                 val->intval = cm->last_temp_mC / 100;
 651                 if (desc->measure_battery_temp)
 652                         ret = -ENODEV;
 653                 break;
 654         case POWER_SUPPLY_PROP_CAPACITY:
 655                 if (!cm->fuel_gauge) {
 656                         ret = -ENODEV;
 657                         break;
 658                 }
 659
 660                 if (!is_batt_present(cm)) {
 661                         /* There is no battery. Assume 100% */
 662                         val->intval = 100;
 663                         break;
 664                 }
 665
 666                 ret = cm->fuel_gauge->get_property(cm->fuel_gauge,
 667                                         POWER_SUPPLY_PROP_CAPACITY, val);
 668                 if (ret)
 669                         break;
 670
 671                 if (val->intval > 100) {
 672                         val->intval = 100;
 673                         break;
 674                 }
 675                 if (val->intval < 0)
 676                         val->intval = 0;
 677
 678                 /* Do not adjust SOC when charging: voltage is overrated */
 679                 if (is_charging(cm))
 680                         break;
 681
 682                 /*
 683                  * If the capacity value is inconsistent, calibrate it base on
 684                  * the battery voltage values and the thresholds given as desc
 685                  */
 686                 ret = get_batt_uV(cm, &uV);
 687                 if (ret) {
 688                         /* Voltage information not available. No calibration */
 689                         ret = 0;
 690                         break;
 691                 }
 692
 693                 if (desc->fullbatt_uV > 0 && uV >= desc->fullbatt_uV &&
 694                     !is_charging(cm)) {
 695                         val->intval = 100;
 696                         break;
 697                 }
 698
 699                 break;
 700         case POWER_SUPPLY_PROP_ONLINE:
 701                 if (is_ext_pwr_online(cm))
 702                         val->intval = 1;
 703                 else
 704                         val->intval = 0;
 705                 break;
 706         case POWER_SUPPLY_PROP_CHARGE_FULL:
 707                 if (cm->fuel_gauge) {
 708                         if (cm->fuel_gauge->get_property(cm->fuel_gauge,
 709                             POWER_SUPPLY_PROP_CHARGE_FULL, val) == 0)
 710                                 break;
 711                 }
 712
 713                 if (is_ext_pwr_online(cm)) {
 714                         /* Not full if it's charging. */
 715                         if (is_charging(cm)) {
 716                                 val->intval = 0;
 717                                 break;
 718                         }
 719                         /*
 720                          * Full if it's powered but not charging andi
 721                          * not forced stop by emergency
 722                          */
 723                         if (!cm->emergency_stop) {
 724                                 val->intval = 1;
 725                                 break;
 726                         }
 727                 }
 728
 729                 /* Full if it's over the fullbatt voltage */
 730                 ret = get_batt_uV(cm, &uV);
 731                 if (!ret && desc->fullbatt_uV > 0 && uV >= desc->fullbatt_uV &&
 732                     !is_charging(cm)) {
 733                         val->intval = 1;
 734                         break;
 735                 }
 736
 737                 /* Full if the cap is 100 */
 738                 if (cm->fuel_gauge) {
 739                         ret = cm->fuel_gauge->get_property(cm->fuel_gauge,
 740                                         POWER_SUPPLY_PROP_CAPACITY, val);
 741                         if (!ret && val->intval >= 100 && !is_charging(cm)) {
 742                                 val->intval = 1;
 743                                 break;
 744                         }
 745                 }
 746
 747                 val->intval = 0;
 748                 ret = 0;
 749                 break;
 750         case POWER_SUPPLY_PROP_CHARGE_NOW:
 751                 if (is_charging(cm)) {
 752                         ret = cm->fuel_gauge->get_property(cm->fuel_gauge,
 753                                                 POWER_SUPPLY_PROP_CHARGE_NOW,
 754                                                 val);
 755                         if (ret) {
 756                                 val->intval = 1;
 757                                 ret = 0;
 758                         } else {
 759                                 /* If CHARGE_NOW is supplied, use it */
 760                                 val->intval = (val->intval > 0) ?
 761                                                 val->intval : 1;
 762                         }
 763                 } else {
 764                         val->intval = 0;
 765                 }
 766                 break;
 767         default:
 768                 return -EINVAL;
 769         }
 770         return ret;
 771 }
 772
 773 #define NUM_CHARGER_PSY_OPTIONAL        (4)
 774 static enum power_supply_property default_charger_props[] = {
 775         /* Guaranteed to provide */
 776         POWER_SUPPLY_PROP_STATUS,
 777         POWER_SUPPLY_PROP_HEALTH,
 778         POWER_SUPPLY_PROP_PRESENT,
 779         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 780         POWER_SUPPLY_PROP_CAPACITY,
 781         POWER_SUPPLY_PROP_ONLINE,
 782         POWER_SUPPLY_PROP_CHARGE_FULL,
 783         /*
 784          * Optional properties are:
 785          * POWER_SUPPLY_PROP_CHARGE_NOW,
 786          * POWER_SUPPLY_PROP_CURRENT_NOW,
 787          * POWER_SUPPLY_PROP_TEMP, and
 788          * POWER_SUPPLY_PROP_TEMP_AMBIENT,
 789          */
 790 };
 791
 792 static struct power_supply psy_default = {
 793         .name = "battery",
 794         .type = POWER_SUPPLY_TYPE_BATTERY,
 795         .properties = default_charger_props,
 796         .num_properties = ARRAY_SIZE(default_charger_props),
 797         .get_property = charger_get_property,
 798 };
 799
 800 /**
 801  * cm_setup_timer - For in-suspend monitoring setup wakeup alarm
 802  *                  for suspend_again.
 803  *
 804  * Returns true if the alarm is set for Charger Manager to use.
 805  * Returns false if
 806  *      cm_setup_timer fails to set an alarm,
 807  *      cm_setup_timer does not need to set an alarm for Charger Manager,
 808  *      or an alarm previously configured is to be used.
 809  */
 810 static bool cm_setup_timer(void)
 811 {
 812         struct charger_manager *cm;
 813         unsigned int wakeup_ms = UINT_MAX;
 814         bool ret = false;
 815
 816         mutex_lock(&cm_list_mtx);
 817
 818         list_for_each_entry(cm, &cm_list, entry) {
 819                 unsigned int fbchk_ms = 0;
 820
 821                 /* fullbatt_vchk is required. setup timer for that */
 822                 if (cm->fullbatt_vchk_jiffies_at) {
 823                         fbchk_ms = jiffies_to_msecs(cm->fullbatt_vchk_jiffies_at
 824                                                     - jiffies);
 825                         if (time_is_before_eq_jiffies(
 826                                 cm->fullbatt_vchk_jiffies_at) ||
 827                                 msecs_to_jiffies(fbchk_ms) < CM_JIFFIES_SMALL) {
 828                                 fullbatt_vchk(&cm->fullbatt_vchk_work.work);
 829                                 fbchk_ms = 0;
 830                         }
 831                 }
 832                 CM_MIN_VALID(wakeup_ms, fbchk_ms);
 833
 834                 /* Skip if polling is not required for this CM */
 835                 if (!is_polling_required(cm) && !cm->emergency_stop)
 836                         continue;
 837                 if (cm->desc->polling_interval_ms == 0)
 838                         continue;
 839                 CM_MIN_VALID(wakeup_ms, cm->desc->polling_interval_ms);
 840         }
 841
 842         mutex_unlock(&cm_list_mtx);
 843
 844         if (wakeup_ms < UINT_MAX && wakeup_ms > 0) {
 845                 pr_info("Charger Manager wakeup timer: %u ms.\n", wakeup_ms);
 846                 if (rtc_dev) {
 847                         struct rtc_wkalrm tmp;
 848                         unsigned long time, now;
 849                         unsigned long add = DIV_ROUND_UP(wakeup_ms, 1000);
 850
 851                         /*
 852                          * Set alarm with the polling interval (wakeup_ms)
 853                          * except when rtc_wkalarm_save comes first.
 854                          * However, the alarm time should be NOW +
 855                          * CM_RTC_SMALL or later.
 856                          */
 857                         tmp.enabled = 1;
 858                         rtc_read_time(rtc_dev, &tmp.time);
 859                         rtc_tm_to_time(&tmp.time, &now);
 860                         if (add < CM_RTC_SMALL)
 861                                 add = CM_RTC_SMALL;
 862                         time = now + add;
 863
 864                         ret = true;
 865
 866                         if (rtc_wkalarm_save.enabled &&
 867                             rtc_wkalarm_save_time &&
 868                             rtc_wkalarm_save_time < time) {
 869                                 if (rtc_wkalarm_save_time < now + CM_RTC_SMALL)
 870                                         time = now + CM_RTC_SMALL;
 871                                 else
 872                                         time = rtc_wkalarm_save_time;
 873
 874                                 /* The timer is not appointed by CM */
 875                                 ret = false;
 876                         }
 877
 878                         pr_info("Waking up after %lu secs.\n",
 879                                         time - now);
 880
 881                         rtc_time_to_tm(time, &tmp.time);
 882                         rtc_set_alarm(rtc_dev, &tmp);
 883                         cm_suspend_duration_ms += wakeup_ms;
 884                         return ret;
 885                 }
 886         }
 887
 888         if (rtc_dev)
 889                 rtc_set_alarm(rtc_dev, &rtc_wkalarm_save);
 890         return false;
 891 }
 892
 893 static void _cm_fbchk_in_suspend(struct charger_manager *cm)
 894 {
 895         unsigned long jiffy_now = jiffies;
 896
 897         if (!cm->fullbatt_vchk_jiffies_at)
 898                 return;
 899
 900         if (g_desc && g_desc->assume_timer_stops_in_suspend)
 901                 jiffy_now += msecs_to_jiffies(cm_suspend_duration_ms);
 902
 903         /* Execute now if it's going to be executed not too long after */
 904         jiffy_now += CM_JIFFIES_SMALL;
 905
 906         if (time_after_eq(jiffy_now, cm->fullbatt_vchk_jiffies_at))
 907                 fullbatt_vchk(&cm->fullbatt_vchk_work.work);
 908 }
 909
 910 /**
 911  * cm_suspend_again - Determine whether suspend again or not
 912  *
 913  * Returns true if the system should be suspended again
 914  * Returns false if the system should be woken up
 915  */
 916 bool cm_suspend_again(void)
 917 {
 918         struct charger_manager *cm;
 919         bool ret = false;
 920
 921         if (!g_desc || !g_desc->rtc_only_wakeup || !g_desc->rtc_only_wakeup() ||
 922             !cm_rtc_set)
 923                 return false;
 924
 925         if (cm_monitor())
 926                 goto out;
 927
 928         ret = true;
 929         mutex_lock(&cm_list_mtx);
 930         list_for_each_entry(cm, &cm_list, entry) {
 931                 _cm_fbchk_in_suspend(cm);
 932
 933                 if (cm->status_save_ext_pwr_inserted != is_ext_pwr_online(cm) ||
 934                     cm->status_save_batt != is_batt_present(cm)) {
 935                         ret = false;
 936                         break;
 937                 }
 938         }
 939         mutex_unlock(&cm_list_mtx);
 940
 941         cm_rtc_set = cm_setup_timer();
 942 out:
 943         /* It's about the time when the non-CM appointed timer goes off */
 944         if (rtc_wkalarm_save.enabled) {
 945                 unsigned long now;
 946                 struct rtc_time tmp;
 947
 948                 rtc_read_time(rtc_dev, &tmp);
 949                 rtc_tm_to_time(&tmp, &now);
 950
 951                 if (rtc_wkalarm_save_time &&
 952                     now + CM_RTC_SMALL >= rtc_wkalarm_save_time)
 953                         return false;
 954         }
 955         return ret;
 956 }
 957 EXPORT_SYMBOL_GPL(cm_suspend_again);
 958
 959 /**
 960  * setup_charger_manager - initialize charger_global_desc data
 961  * @gd: pointer to instance of charger_global_desc
 962  */
 963 int setup_charger_manager(struct charger_global_desc *gd)
 964 {
 965         if (!gd)
 966                 return -EINVAL;
 967
 968         if (rtc_dev)
 969                 rtc_class_close(rtc_dev);
 970         rtc_dev = NULL;
 971         g_desc = NULL;
 972
 973         if (!gd->rtc_only_wakeup) {
 974                 pr_err("The callback rtc_only_wakeup is not given.\n");
 975                 return -EINVAL;
 976         }
 977
 978         if (gd->rtc_name) {
 979                 rtc_dev = rtc_class_open(gd->rtc_name);
 980                 if (IS_ERR_OR_NULL(rtc_dev)) {
 981                         rtc_dev = NULL;
 982                         /* Retry at probe. RTC may be not registered yet */
 983                 }
 984         } else {
 985                 pr_warn("No wakeup timer is given for charger manager."
 986                         "In-suspend monitoring won't work.\n");
 987         }
 988
 989         g_desc = gd;
 990         return 0;
 991 }
 992 EXPORT_SYMBOL_GPL(setup_charger_manager);
 993
 994 /**
 995  * charger_extcon_work - enable/diable charger according to the state
 996  *                      of charger cable
 997  *
 998  * @work: work_struct of the function charger_extcon_work.
 999  */
1000 static void charger_extcon_work(struct work_struct *work)
1001 {
1002         struct charger_cable *cable =
1003                         container_of(work, struct charger_cable, wq);
1004         int ret;
1005
1006         if (cable->attached && cable->min_uA != 0 && cable->max_uA != 0) {
1007                 ret = regulator_set_current_limit(cable->charger->consumer,
1008                                         cable->min_uA, cable->max_uA);
1009                 if (ret < 0) {
1010                         pr_err("Cannot set current limit of %s (%s)\n",
1011                                 cable->charger->regulator_name, cable->name);
1012                         return;
1013                 }
1014
1015                 pr_info("Set current limit of %s : %duA ~ %duA\n",
1016                                         cable->charger->regulator_name,
1017                                         cable->min_uA, cable->max_uA);
1018         }
1019
1020         try_charger_enable(cable->cm, cable->attached);
1021 }
1022
1023 /**
1024  * charger_extcon_notifier - receive the state of charger cable
1025  *                      when registered cable is attached or detached.
1026  *
1027  * @self: the notifier block of the charger_extcon_notifier.
1028  * @event: the cable state.
1029  * @ptr: the data pointer of notifier block.
1030  */
1031 static int charger_extcon_notifier(struct notifier_block *self,
1032                         unsigned long event, void *ptr)
1033 {
1034         struct charger_cable *cable =
1035                 container_of(self, struct charger_cable, nb);
1036
1037         cable->attached = event;
1038         schedule_work(&cable->wq);
1039
1040         return NOTIFY_DONE;
1041 }
1042
1043 /**
1044  * charger_extcon_init - register external connector to use it
1045  *                      as the charger cable
1046  *
1047  * @cm: the Charger Manager representing the battery.
1048  * @cable: the Charger cable representing the external connector.
1049  */
1050 static int charger_extcon_init(struct charger_manager *cm,
1051                 struct charger_cable *cable)
1052 {
1053         int ret = 0;
1054
1055         /*
1056          * Charger manager use Extcon framework to identify
1057          * the charger cable among various external connector
1058          * cable (e.g., TA, USB, MHL, Dock).
1059          */
1060         INIT_WORK(&cable->wq, charger_extcon_work);
1061         cable->nb.notifier_call = charger_extcon_notifier;
1062         ret = extcon_register_interest(&cable->extcon_dev,
1063                         cable->extcon_name, cable->name, &cable->nb);
1064         if (ret < 0) {
1065                 pr_info("Cannot register extcon_dev for %s(cable: %s).\n",
1066                                 cable->extcon_name,
1067                                 cable->name);
1068                 ret = -EINVAL;
1069         }
1070
1071         return ret;
1072 }
1073
1074 static int charger_manager_probe(struct platform_device *pdev)
1075 {
1076         struct charger_desc *desc = dev_get_platdata(&pdev->dev);
1077         struct charger_manager *cm;
1078         int ret = 0, i = 0;
1079         int j = 0;
1080         union power_supply_propval val;
1081
1082         if (g_desc && !rtc_dev && g_desc->rtc_name) {
1083                 rtc_dev = rtc_class_open(g_desc->rtc_name);
1084                 if (IS_ERR_OR_NULL(rtc_dev)) {
1085                         rtc_dev = NULL;
1086                         dev_err(&pdev->dev, "Cannot get RTC %s.\n",
1087                                 g_desc->rtc_name);
1088                         ret = -ENODEV;
1089                         goto err_alloc;
1090                 }
1091         }
1092
1093         if (!desc) {
1094                 dev_err(&pdev->dev, "No platform data (desc) found.\n");
1095                 ret = -ENODEV;
1096                 goto err_alloc;
1097         }
1098
1099         cm = kzalloc(sizeof(struct charger_manager), GFP_KERNEL);
1100         if (!cm) {
1101                 dev_err(&pdev->dev, "Cannot allocate memory.\n");
1102                 ret = -ENOMEM;
1103                 goto err_alloc;
1104         }
1105
1106         /* Basic Values. Unspecified are Null or 0 */
1107         cm->dev = &pdev->dev;
1108         cm->desc = kzalloc(sizeof(struct charger_desc), GFP_KERNEL);
1109         if (!cm->desc) {
1110                 dev_err(&pdev->dev, "Cannot allocate memory.\n");
1111                 ret = -ENOMEM;
1112                 goto err_alloc_desc;
1113         }
1114         memcpy(cm->desc, desc, sizeof(struct charger_desc));
1115         cm->last_temp_mC = INT_MIN; /* denotes "unmeasured, yet" */
1116
1117         /*
1118          * The following two do not need to be errors.
1119          * Users may intentionally ignore those two features.
1120          */
1121         if (desc->fullbatt_uV == 0) {
1122                 dev_info(&pdev->dev, "Ignoring full-battery voltage threshold"
1123                                         " as it is not supplied.");
1124         }
1125         if (!desc->fullbatt_vchkdrop_ms || !desc->fullbatt_vchkdrop_uV) {
1126                 dev_info(&pdev->dev, "Disabling full-battery voltage drop "
1127                                 "checking mechanism as it is not supplied.");
1128                 desc->fullbatt_vchkdrop_ms = 0;
1129                 desc->fullbatt_vchkdrop_uV = 0;
1130         }
1131
1132         if (!desc->charger_regulators || desc->num_charger_regulators < 1) {
1133                 ret = -EINVAL;
1134                 dev_err(&pdev->dev, "charger_regulators undefined.\n");
1135                 goto err_no_charger;
1136         }
1137
1138         if (!desc->psy_charger_stat || !desc->psy_charger_stat[0]) {
1139                 dev_err(&pdev->dev, "No power supply defined.\n");
1140                 ret = -EINVAL;
1141                 goto err_no_charger_stat;
1142         }
1143
1144         /* Counting index only */
1145         while (desc->psy_charger_stat[i])
1146                 i++;
1147
1148         cm->charger_stat = kzalloc(sizeof(struct power_supply *) * (i + 1),
1149                                    GFP_KERNEL);
1150         if (!cm->charger_stat) {
1151                 ret = -ENOMEM;
1152                 goto err_no_charger_stat;
1153         }
1154
1155         for (i = 0; desc->psy_charger_stat[i]; i++) {
1156                 cm->charger_stat[i] = power_supply_get_by_name(
1157                                         desc->psy_charger_stat[i]);
1158                 if (!cm->charger_stat[i]) {
1159                         dev_err(&pdev->dev, "Cannot find power supply "
1160                                         "\"%s\"\n",
1161                                         desc->psy_charger_stat[i]);
1162                         ret = -ENODEV;
1163                         goto err_chg_stat;
1164                 }
1165         }
1166
1167         cm->fuel_gauge = power_supply_get_by_name(desc->psy_fuel_gauge);
1168         if (!cm->fuel_gauge) {
1169                 dev_err(&pdev->dev, "Cannot find power supply \"%s\"\n",
1170                                 desc->psy_fuel_gauge);
1171                 ret = -ENODEV;
1172                 goto err_chg_stat;
1173         }
1174
1175         if (desc->polling_interval_ms == 0 ||
1176             msecs_to_jiffies(desc->polling_interval_ms) <= CM_JIFFIES_SMALL) {
1177                 dev_err(&pdev->dev, "polling_interval_ms is too small\n");
1178                 ret = -EINVAL;
1179                 goto err_chg_stat;
1180         }
1181
1182         if (!desc->temperature_out_of_range) {
1183                 dev_err(&pdev->dev, "there is no temperature_out_of_range\n");
1184                 ret = -EINVAL;
1185                 goto err_chg_stat;
1186         }
1187
1188         platform_set_drvdata(pdev, cm);
1189
1190         memcpy(&cm->charger_psy, &psy_default, sizeof(psy_default));
1191
1192         if (!desc->psy_name) {
1193                 strncpy(cm->psy_name_buf, psy_default.name, PSY_NAME_MAX);
1194         } else {
1195                 strncpy(cm->psy_name_buf, desc->psy_name, PSY_NAME_MAX);
1196         }
1197         cm->charger_psy.name = cm->psy_name_buf;
1198
1199         /* Allocate for psy properties because they may vary */
1200         cm->charger_psy.properties = kzalloc(sizeof(enum power_supply_property)
1201                                 * (ARRAY_SIZE(default_charger_props) +
1202                                 NUM_CHARGER_PSY_OPTIONAL),
1203                                 GFP_KERNEL);
1204         if (!cm->charger_psy.properties) {
1205                 dev_err(&pdev->dev, "Cannot allocate for psy properties.\n");
1206                 ret = -ENOMEM;
1207                 goto err_chg_stat;
1208         }
1209         memcpy(cm->charger_psy.properties, default_charger_props,
1210                 sizeof(enum power_supply_property) *
1211                 ARRAY_SIZE(default_charger_props));
1212         cm->charger_psy.num_properties = psy_default.num_properties;
1213
1214         /* Find which optional psy-properties are available */
1215         if (!cm->fuel_gauge->get_property(cm->fuel_gauge,
1216                                           POWER_SUPPLY_PROP_CHARGE_NOW, &val)) {
1217                 cm->charger_psy.properties[cm->charger_psy.num_properties] =
1218                                 POWER_SUPPLY_PROP_CHARGE_NOW;
1219                 cm->charger_psy.num_properties++;
1220         }
1221         if (!cm->fuel_gauge->get_property(cm->fuel_gauge,
1222                                           POWER_SUPPLY_PROP_CURRENT_NOW,
1223                                           &val)) {
1224                 cm->charger_psy.properties[cm->charger_psy.num_properties] =
1225                                 POWER_SUPPLY_PROP_CURRENT_NOW;
1226                 cm->charger_psy.num_properties++;
1227         }
1228
1229         if (desc->measure_battery_temp) {
1230                 cm->charger_psy.properties[cm->charger_psy.num_properties] =
1231                                 POWER_SUPPLY_PROP_TEMP;
1232                 cm->charger_psy.num_properties++;
1233         } else {
1234                 cm->charger_psy.properties[cm->charger_psy.num_properties] =
1235                                 POWER_SUPPLY_PROP_TEMP_AMBIENT;
1236                 cm->charger_psy.num_properties++;
1237         }
1238
1239         INIT_DELAYED_WORK(&cm->fullbatt_vchk_work, fullbatt_vchk);
1240
1241         ret = power_supply_register(NULL, &cm->charger_psy);
1242         if (ret) {
1243                 dev_err(&pdev->dev, "Cannot register charger-manager with"
1244                                 " name \"%s\".\n", cm->charger_psy.name);
1245                 goto err_register;
1246         }
1247
1248         for (i = 0 ; i < desc->num_charger_regulators ; i++) {
1249                 struct charger_regulator *charger
1250                                         = &desc->charger_regulators[i];
1251
1252                 charger->consumer = regulator_get(&pdev->dev,
1253                                         charger->regulator_name);
1254                 if (charger->consumer == NULL) {
1255                         dev_err(&pdev->dev, "Cannot find charger(%s)n",
1256                                                 charger->regulator_name);
1257                         ret = -EINVAL;
1258                         goto err_chg_get;
1259                 }
1260
1261                 for (j = 0 ; j < charger->num_cables ; j++) {
1262                         struct charger_cable *cable = &charger->cables[j];
1263
1264                         ret = charger_extcon_init(cm, cable);
1265                         if (ret < 0) {
1266                                 dev_err(&pdev->dev, "Cannot find charger(%s)n",
1267                                                 charger->regulator_name);
1268                                 goto err_extcon;
1269                         }
1270                         cable->charger = charger;
1271                         cable->cm = cm;
1272                 }
1273         }
1274
1275         ret = try_charger_enable(cm, true);
1276         if (ret) {
1277                 dev_err(&pdev->dev, "Cannot enable charger regulators\n");
1278                 goto err_chg_enable;
1279         }
1280
1281         /* Add to the list */
1282         mutex_lock(&cm_list_mtx);
1283         list_add(&cm->entry, &cm_list);
1284         mutex_unlock(&cm_list_mtx);
1285
1286         /*
1287          * Charger-manager is capable of waking up the systme from sleep
1288          * when event is happend through cm_notify_event()
1289          */
1290         device_init_wakeup(&pdev->dev, true);
1291         device_set_wakeup_capable(&pdev->dev, false);
1292
1293         schedule_work(&setup_polling);
1294
1295         return 0;
1296
1297 err_chg_enable:
1298 err_extcon:
1299         for (i = 0 ; i < desc->num_charger_regulators ; i++) {
1300                 struct charger_regulator *charger
1301                                 = &desc->charger_regulators[i];
1302                 for (j = 0 ; j < charger->num_cables ; j++) {
1303                         struct charger_cable *cable = &charger->cables[j];
1304                         extcon_unregister_interest(&cable->extcon_dev);
1305                 }
1306         }
1307 err_chg_get:
1308         for (i = 0 ; i < desc->num_charger_regulators ; i++)
1309                 regulator_put(desc->charger_regulators[i].consumer);
1310
1311         power_supply_unregister(&cm->charger_psy);
1312 err_register:
1313         kfree(cm->charger_psy.properties);
1314 err_chg_stat:
1315         kfree(cm->charger_stat);
1316 err_no_charger_stat:
1317 err_no_charger:
1318         kfree(cm->desc);
1319 err_alloc_desc:
1320         kfree(cm);
1321 err_alloc:
1322         return ret;
1323 }
1324
1325 static int __devexit charger_manager_remove(struct platform_device *pdev)
1326 {
1327         struct charger_manager *cm = platform_get_drvdata(pdev);
1328         struct charger_desc *desc = cm->desc;
1329         int i = 0;
1330         int j = 0;
1331
1332         /* Remove from the list */
1333         mutex_lock(&cm_list_mtx);
1334         list_del(&cm->entry);
1335         mutex_unlock(&cm_list_mtx);
1336
1337         if (work_pending(&setup_polling))
1338                 cancel_work_sync(&setup_polling);
1339         if (delayed_work_pending(&cm_monitor_work))
1340                 cancel_delayed_work_sync(&cm_monitor_work);
1341
1342         for (i = 0 ; i < desc->num_charger_regulators ; i++) {
1343                 struct charger_regulator *charger
1344                                 = &desc->charger_regulators[i];
1345                 for (j = 0 ; j < charger->num_cables ; j++) {
1346                         struct charger_cable *cable = &charger->cables[j];
1347                         extcon_unregister_interest(&cable->extcon_dev);
1348                 }
1349         }
1350
1351         for (i = 0 ; i < desc->num_charger_regulators ; i++)
1352                 regulator_put(desc->charger_regulators[i].consumer);
1353
1354         power_supply_unregister(&cm->charger_psy);
1355
1356         try_charger_enable(cm, false);
1357
1358         kfree(cm->charger_psy.properties);
1359         kfree(cm->charger_stat);
1360         kfree(cm->desc);
1361         kfree(cm);
1362
1363         return 0;
1364 }
1365
1366 static const struct platform_device_id charger_manager_id[] = {
1367         { "charger-manager", 0 },
1368         { },
1369 };
1370 MODULE_DEVICE_TABLE(platform, charger_manager_id);
1371
1372 static int cm_suspend_noirq(struct device *dev)
1373 {
1374         int ret = 0;
1375
1376         if (device_may_wakeup(dev)) {
1377                 device_set_wakeup_capable(dev, false);
1378                 ret = -EAGAIN;
1379         }
1380
1381         return ret;
1382 }
1383
1384 static int cm_suspend_prepare(struct device *dev)
1385 {
1386         struct charger_manager *cm = dev_get_drvdata(dev);
1387
1388         if (!cm_suspended) {
1389                 if (rtc_dev) {
1390                         struct rtc_time tmp;
1391                         unsigned long now;
1392
1393                         rtc_read_alarm(rtc_dev, &rtc_wkalarm_save);
1394                         rtc_read_time(rtc_dev, &tmp);
1395
1396                         if (rtc_wkalarm_save.enabled) {
1397                                 rtc_tm_to_time(&rtc_wkalarm_save.time,
1398                                                &rtc_wkalarm_save_time);
1399                                 rtc_tm_to_time(&tmp, &now);
1400                                 if (now > rtc_wkalarm_save_time)
1401                                         rtc_wkalarm_save_time = 0;
1402                         } else {
1403                                 rtc_wkalarm_save_time = 0;
1404                         }
1405                 }
1406                 cm_suspended = true;
1407         }
1408
1409         if (delayed_work_pending(&cm->fullbatt_vchk_work))
1410                 cancel_delayed_work(&cm->fullbatt_vchk_work);
1411         cm->status_save_ext_pwr_inserted = is_ext_pwr_online(cm);
1412         cm->status_save_batt = is_batt_present(cm);
1413
1414         if (!cm_rtc_set) {
1415                 cm_suspend_duration_ms = 0;
1416                 cm_rtc_set = cm_setup_timer();
1417         }
1418
1419         return 0;
1420 }
1421
1422 static void cm_suspend_complete(struct device *dev)
1423 {
1424         struct charger_manager *cm = dev_get_drvdata(dev);
1425
1426         if (cm_suspended) {
1427                 if (rtc_dev) {
1428                         struct rtc_wkalrm tmp;
1429
1430                         rtc_read_alarm(rtc_dev, &tmp);
1431                         rtc_wkalarm_save.pending = tmp.pending;
1432                         rtc_set_alarm(rtc_dev, &rtc_wkalarm_save);
1433                 }
1434                 cm_suspended = false;
1435                 cm_rtc_set = false;
1436         }
1437
1438         /* Re-enqueue delayed work (fullbatt_vchk_work) */
1439         if (cm->fullbatt_vchk_jiffies_at) {
1440                 unsigned long delay = 0;
1441                 unsigned long now = jiffies + CM_JIFFIES_SMALL;
1442
1443                 if (time_after_eq(now, cm->fullbatt_vchk_jiffies_at)) {
1444                         delay = (unsigned long)((long)now
1445                                 - (long)(cm->fullbatt_vchk_jiffies_at));
1446                         delay = jiffies_to_msecs(delay);
1447                 } else {
1448                         delay = 0;
1449                 }
1450
1451                 /*
1452                  * Account for cm_suspend_duration_ms if
1453                  * assume_timer_stops_in_suspend is active
1454                  */
1455                 if (g_desc && g_desc->assume_timer_stops_in_suspend) {
1456                         if (delay > cm_suspend_duration_ms)
1457                                 delay -= cm_suspend_duration_ms;
1458                         else
1459                                 delay = 0;
1460                 }
1461
1462                 queue_delayed_work(cm_wq, &cm->fullbatt_vchk_work,
1463                                    msecs_to_jiffies(delay));
1464         }
1465         device_set_wakeup_capable(cm->dev, false);
1466         uevent_notify(cm, NULL);
1467 }
1468
1469 static const struct dev_pm_ops charger_manager_pm = {
1470         .prepare        = cm_suspend_prepare,
1471         .suspend_noirq  = cm_suspend_noirq,
1472         .complete       = cm_suspend_complete,
1473 };
1474
1475 static struct platform_driver charger_manager_driver = {
1476         .driver = {
1477                 .name = "charger-manager",
1478                 .owner = THIS_MODULE,
1479                 .pm = &charger_manager_pm,
1480         },
1481         .probe = charger_manager_probe,
1482         .remove = __devexit_p(charger_manager_remove),
1483         .id_table = charger_manager_id,
1484 };
1485
1486 static int __init charger_manager_init(void)
1487 {
1488         cm_wq = create_freezable_workqueue("charger_manager");
1489         INIT_DELAYED_WORK(&cm_monitor_work, cm_monitor_poller);
1490
1491         return platform_driver_register(&charger_manager_driver);
1492 }
1493 late_initcall(charger_manager_init);
1494
1495 static void __exit charger_manager_cleanup(void)
1496 {
1497         destroy_workqueue(cm_wq);
1498         cm_wq = NULL;
1499
1500         platform_driver_unregister(&charger_manager_driver);
1501 }
1502 module_exit(charger_manager_cleanup);
1503
1504 /**
1505  * find_power_supply - find the associated power_supply of charger
1506  * @cm: the Charger Manager representing the battery
1507  * @psy: pointer to instance of charger's power_supply
1508  */
1509 static bool find_power_supply(struct charger_manager *cm,
1510                         struct power_supply *psy)
1511 {
1512         int i;
1513         bool found = false;
1514
1515         for (i = 0; cm->charger_stat[i]; i++) {
1516                 if (psy == cm->charger_stat[i]) {
1517                         found = true;
1518                         break;
1519                 }
1520         }
1521
1522         return found;
1523 }
1524
1525 /**
1526  * cm_notify_event - charger driver notify Charger Manager of charger event
1527  * @psy: pointer to instance of charger's power_supply
1528  * @type: type of charger event
1529  * @msg: optional message passed to uevent_notify fuction
1530  */
1531 void cm_notify_event(struct power_supply *psy, enum cm_event_types type,
1532                      char *msg)
1533 {
1534         struct charger_manager *cm;
1535         bool found_power_supply = false;
1536
1537         if (psy == NULL)
1538                 return;
1539
1540         mutex_lock(&cm_list_mtx);
1541         list_for_each_entry(cm, &cm_list, entry) {
1542                 found_power_supply = find_power_supply(cm, psy);
1543                 if (found_power_supply)
1544                         break;
1545         }
1546         mutex_unlock(&cm_list_mtx);
1547
1548         if (!found_power_supply)
1549                 return;
1550
1551         switch (type) {
1552         case CM_EVENT_BATT_FULL:
1553                 fullbatt_handler(cm);
1554                 break;
1555         case CM_EVENT_BATT_OUT:
1556                 battout_handler(cm);
1557                 break;
1558         case CM_EVENT_BATT_IN:
1559         case CM_EVENT_EXT_PWR_IN_OUT ... CM_EVENT_CHG_START_STOP:
1560                 misc_event_handler(cm, type);
1561                 break;
1562         case CM_EVENT_UNKNOWN:
1563         case CM_EVENT_OTHERS:
1564                 uevent_notify(cm, msg ? msg : default_event_names[type]);
1565                 break;
1566         default:
1567                 dev_err(cm->dev, "%s type not specified.\n", __func__);
1568                 break;
1569         }
1570 }
1571 EXPORT_SYMBOL_GPL(cm_notify_event);
1572
1573 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
1574 MODULE_DESCRIPTION("Charger Manager");
1575 MODULE_LICENSE("GPL");