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                 next_polling = jiffies + polling_jiffy;
 513                 mod_delayed_work(cm_wq, &cm_monitor_work, polling_jiffy);
 514         }
 515
 516 out:
 517         mutex_unlock(&cm_list_mtx);
 518 }
 519 static DECLARE_WORK(setup_polling, _setup_polling);
 520
 521 /**
 522  * cm_monitor_poller - The Monitor / Poller.
 523  * @work: work_struct of the function cm_monitor_poller
 524  *
 525  * During non-suspended state, cm_monitor_poller is used to poll and monitor
 526  * the batteries.
 527  */
 528 static void cm_monitor_poller(struct work_struct *work)
 529 {
 530         cm_monitor();
 531         schedule_work(&setup_polling);
 532 }
 533
 534 /**
 535  * fullbatt_handler - Event handler for CM_EVENT_BATT_FULL
 536  * @cm: the Charger Manager representing the battery.
 537  */
 538 static void fullbatt_handler(struct charger_manager *cm)
 539 {
 540         struct charger_desc *desc = cm->desc;
 541
 542         if (!desc->fullbatt_vchkdrop_uV || !desc->fullbatt_vchkdrop_ms)
 543                 goto out;
 544
 545         if (cm_suspended)
 546                 device_set_wakeup_capable(cm->dev, true);
 547
 548         mod_delayed_work(cm_wq, &cm->fullbatt_vchk_work,
 549                          msecs_to_jiffies(desc->fullbatt_vchkdrop_ms));
 550         cm->fullbatt_vchk_jiffies_at = jiffies + msecs_to_jiffies(
 551                                        desc->fullbatt_vchkdrop_ms);
 552
 553         if (cm->fullbatt_vchk_jiffies_at == 0)
 554                 cm->fullbatt_vchk_jiffies_at = 1;
 555
 556 out:
 557         dev_info(cm->dev, "EVENT_HANDLE: Battery Fully Charged.\n");
 558         uevent_notify(cm, default_event_names[CM_EVENT_BATT_FULL]);
 559 }
 560
 561 /**
 562  * battout_handler - Event handler for CM_EVENT_BATT_OUT
 563  * @cm: the Charger Manager representing the battery.
 564  */
 565 static void battout_handler(struct charger_manager *cm)
 566 {
 567         if (cm_suspended)
 568                 device_set_wakeup_capable(cm->dev, true);
 569
 570         if (!is_batt_present(cm)) {
 571                 dev_emerg(cm->dev, "Battery Pulled Out!\n");
 572                 uevent_notify(cm, default_event_names[CM_EVENT_BATT_OUT]);
 573         } else {
 574                 uevent_notify(cm, "Battery Reinserted?");
 575         }
 576 }
 577
 578 /**
 579  * misc_event_handler - Handler for other evnets
 580  * @cm: the Charger Manager representing the battery.
 581  * @type: the Charger Manager representing the battery.
 582  */
 583 static void misc_event_handler(struct charger_manager *cm,
 584                         enum cm_event_types type)
 585 {
 586         if (cm_suspended)
 587                 device_set_wakeup_capable(cm->dev, true);
 588
 589         if (!delayed_work_pending(&cm_monitor_work) &&
 590             is_polling_required(cm) && cm->desc->polling_interval_ms)
 591                 schedule_work(&setup_polling);
 592         uevent_notify(cm, default_event_names[type]);
 593 }
 594
 595 static int charger_get_property(struct power_supply *psy,
 596                 enum power_supply_property psp,
 597                 union power_supply_propval *val)
 598 {
 599         struct charger_manager *cm = container_of(psy,
 600                         struct charger_manager, charger_psy);
 601         struct charger_desc *desc = cm->desc;
 602         int ret = 0;
 603         int uV;
 604
 605         switch (psp) {
 606         case POWER_SUPPLY_PROP_STATUS:
 607                 if (is_charging(cm))
 608                         val->intval = POWER_SUPPLY_STATUS_CHARGING;
 609                 else if (is_ext_pwr_online(cm))
 610                         val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
 611                 else
 612                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 613                 break;
 614         case POWER_SUPPLY_PROP_HEALTH:
 615                 if (cm->emergency_stop > 0)
 616                         val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
 617                 else if (cm->emergency_stop < 0)
 618                         val->intval = POWER_SUPPLY_HEALTH_COLD;
 619                 else
 620                         val->intval = POWER_SUPPLY_HEALTH_GOOD;
 621                 break;
 622         case POWER_SUPPLY_PROP_PRESENT:
 623                 if (is_batt_present(cm))
 624                         val->intval = 1;
 625                 else
 626                         val->intval = 0;
 627                 break;
 628         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 629                 ret = get_batt_uV(cm, &val->intval);
 630                 break;
 631         case POWER_SUPPLY_PROP_CURRENT_NOW:
 632                 ret = cm->fuel_gauge->get_property(cm->fuel_gauge,
 633                                 POWER_SUPPLY_PROP_CURRENT_NOW, val);
 634                 break;
 635         case POWER_SUPPLY_PROP_TEMP:
 636                 /* in thenth of centigrade */
 637                 if (cm->last_temp_mC == INT_MIN)
 638                         desc->temperature_out_of_range(&cm->last_temp_mC);
 639                 val->intval = cm->last_temp_mC / 100;
 640                 if (!desc->measure_battery_temp)
 641                         ret = -ENODEV;
 642                 break;
 643         case POWER_SUPPLY_PROP_TEMP_AMBIENT:
 644                 /* in thenth of centigrade */
 645                 if (cm->last_temp_mC == INT_MIN)
 646                         desc->temperature_out_of_range(&cm->last_temp_mC);
 647                 val->intval = cm->last_temp_mC / 100;
 648                 if (desc->measure_battery_temp)
 649                         ret = -ENODEV;
 650                 break;
 651         case POWER_SUPPLY_PROP_CAPACITY:
 652                 if (!cm->fuel_gauge) {
 653                         ret = -ENODEV;
 654                         break;
 655                 }
 656
 657                 if (!is_batt_present(cm)) {
 658                         /* There is no battery. Assume 100% */
 659                         val->intval = 100;
 660                         break;
 661                 }
 662
 663                 ret = cm->fuel_gauge->get_property(cm->fuel_gauge,
 664                                         POWER_SUPPLY_PROP_CAPACITY, val);
 665                 if (ret)
 666                         break;
 667
 668                 if (val->intval > 100) {
 669                         val->intval = 100;
 670                         break;
 671                 }
 672                 if (val->intval < 0)
 673                         val->intval = 0;
 674
 675                 /* Do not adjust SOC when charging: voltage is overrated */
 676                 if (is_charging(cm))
 677                         break;
 678
 679                 /*
 680                  * If the capacity value is inconsistent, calibrate it base on
 681                  * the battery voltage values and the thresholds given as desc
 682                  */
 683                 ret = get_batt_uV(cm, &uV);
 684                 if (ret) {
 685                         /* Voltage information not available. No calibration */
 686                         ret = 0;
 687                         break;
 688                 }
 689
 690                 if (desc->fullbatt_uV > 0 && uV >= desc->fullbatt_uV &&
 691                     !is_charging(cm)) {
 692                         val->intval = 100;
 693                         break;
 694                 }
 695
 696                 break;
 697         case POWER_SUPPLY_PROP_ONLINE:
 698                 if (is_ext_pwr_online(cm))
 699                         val->intval = 1;
 700                 else
 701                         val->intval = 0;
 702                 break;
 703         case POWER_SUPPLY_PROP_CHARGE_FULL:
 704                 if (cm->fuel_gauge) {
 705                         if (cm->fuel_gauge->get_property(cm->fuel_gauge,
 706                             POWER_SUPPLY_PROP_CHARGE_FULL, val) == 0)
 707                                 break;
 708                 }
 709
 710                 if (is_ext_pwr_online(cm)) {
 711                         /* Not full if it's charging. */
 712                         if (is_charging(cm)) {
 713                                 val->intval = 0;
 714                                 break;
 715                         }
 716                         /*
 717                          * Full if it's powered but not charging andi
 718                          * not forced stop by emergency
 719                          */
 720                         if (!cm->emergency_stop) {
 721                                 val->intval = 1;
 722                                 break;
 723                         }
 724                 }
 725
 726                 /* Full if it's over the fullbatt voltage */
 727                 ret = get_batt_uV(cm, &uV);
 728                 if (!ret && desc->fullbatt_uV > 0 && uV >= desc->fullbatt_uV &&
 729                     !is_charging(cm)) {
 730                         val->intval = 1;
 731                         break;
 732                 }
 733
 734                 /* Full if the cap is 100 */
 735                 if (cm->fuel_gauge) {
 736                         ret = cm->fuel_gauge->get_property(cm->fuel_gauge,
 737                                         POWER_SUPPLY_PROP_CAPACITY, val);
 738                         if (!ret && val->intval >= 100 && !is_charging(cm)) {
 739                                 val->intval = 1;
 740                                 break;
 741                         }
 742                 }
 743
 744                 val->intval = 0;
 745                 ret = 0;
 746                 break;
 747         case POWER_SUPPLY_PROP_CHARGE_NOW:
 748                 if (is_charging(cm)) {
 749                         ret = cm->fuel_gauge->get_property(cm->fuel_gauge,
 750                                                 POWER_SUPPLY_PROP_CHARGE_NOW,
 751                                                 val);
 752                         if (ret) {
 753                                 val->intval = 1;
 754                                 ret = 0;
 755                         } else {
 756                                 /* If CHARGE_NOW is supplied, use it */
 757                                 val->intval = (val->intval > 0) ?
 758                                                 val->intval : 1;
 759                         }
 760                 } else {
 761                         val->intval = 0;
 762                 }
 763                 break;
 764         default:
 765                 return -EINVAL;
 766         }
 767         return ret;
 768 }
 769
 770 #define NUM_CHARGER_PSY_OPTIONAL        (4)
 771 static enum power_supply_property default_charger_props[] = {
 772         /* Guaranteed to provide */
 773         POWER_SUPPLY_PROP_STATUS,
 774         POWER_SUPPLY_PROP_HEALTH,
 775         POWER_SUPPLY_PROP_PRESENT,
 776         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 777         POWER_SUPPLY_PROP_CAPACITY,
 778         POWER_SUPPLY_PROP_ONLINE,
 779         POWER_SUPPLY_PROP_CHARGE_FULL,
 780         /*
 781          * Optional properties are:
 782          * POWER_SUPPLY_PROP_CHARGE_NOW,
 783          * POWER_SUPPLY_PROP_CURRENT_NOW,
 784          * POWER_SUPPLY_PROP_TEMP, and
 785          * POWER_SUPPLY_PROP_TEMP_AMBIENT,
 786          */
 787 };
 788
 789 static struct power_supply psy_default = {
 790         .name = "battery",
 791         .type = POWER_SUPPLY_TYPE_BATTERY,
 792         .properties = default_charger_props,
 793         .num_properties = ARRAY_SIZE(default_charger_props),
 794         .get_property = charger_get_property,
 795 };
 796
 797 /**
 798  * cm_setup_timer - For in-suspend monitoring setup wakeup alarm
 799  *                  for suspend_again.
 800  *
 801  * Returns true if the alarm is set for Charger Manager to use.
 802  * Returns false if
 803  *      cm_setup_timer fails to set an alarm,
 804  *      cm_setup_timer does not need to set an alarm for Charger Manager,
 805  *      or an alarm previously configured is to be used.
 806  */
 807 static bool cm_setup_timer(void)
 808 {
 809         struct charger_manager *cm;
 810         unsigned int wakeup_ms = UINT_MAX;
 811         bool ret = false;
 812
 813         mutex_lock(&cm_list_mtx);
 814
 815         list_for_each_entry(cm, &cm_list, entry) {
 816                 unsigned int fbchk_ms = 0;
 817
 818                 /* fullbatt_vchk is required. setup timer for that */
 819                 if (cm->fullbatt_vchk_jiffies_at) {
 820                         fbchk_ms = jiffies_to_msecs(cm->fullbatt_vchk_jiffies_at
 821                                                     - jiffies);
 822                         if (time_is_before_eq_jiffies(
 823                                 cm->fullbatt_vchk_jiffies_at) ||
 824                                 msecs_to_jiffies(fbchk_ms) < CM_JIFFIES_SMALL) {
 825                                 fullbatt_vchk(&cm->fullbatt_vchk_work.work);
 826                                 fbchk_ms = 0;
 827                         }
 828                 }
 829                 CM_MIN_VALID(wakeup_ms, fbchk_ms);
 830
 831                 /* Skip if polling is not required for this CM */
 832                 if (!is_polling_required(cm) && !cm->emergency_stop)
 833                         continue;
 834                 if (cm->desc->polling_interval_ms == 0)
 835                         continue;
 836                 CM_MIN_VALID(wakeup_ms, cm->desc->polling_interval_ms);
 837         }
 838
 839         mutex_unlock(&cm_list_mtx);
 840
 841         if (wakeup_ms < UINT_MAX && wakeup_ms > 0) {
 842                 pr_info("Charger Manager wakeup timer: %u ms.\n", wakeup_ms);
 843                 if (rtc_dev) {
 844                         struct rtc_wkalrm tmp;
 845                         unsigned long time, now;
 846                         unsigned long add = DIV_ROUND_UP(wakeup_ms, 1000);
 847
 848                         /*
 849                          * Set alarm with the polling interval (wakeup_ms)
 850                          * except when rtc_wkalarm_save comes first.
 851                          * However, the alarm time should be NOW +
 852                          * CM_RTC_SMALL or later.
 853                          */
 854                         tmp.enabled = 1;
 855                         rtc_read_time(rtc_dev, &tmp.time);
 856                         rtc_tm_to_time(&tmp.time, &now);
 857                         if (add < CM_RTC_SMALL)
 858                                 add = CM_RTC_SMALL;
 859                         time = now + add;
 860
 861                         ret = true;
 862
 863                         if (rtc_wkalarm_save.enabled &&
 864                             rtc_wkalarm_save_time &&
 865                             rtc_wkalarm_save_time < time) {
 866                                 if (rtc_wkalarm_save_time < now + CM_RTC_SMALL)
 867                                         time = now + CM_RTC_SMALL;
 868                                 else
 869                                         time = rtc_wkalarm_save_time;
 870
 871                                 /* The timer is not appointed by CM */
 872                                 ret = false;
 873                         }
 874
 875                         pr_info("Waking up after %lu secs.\n",
 876                                         time - now);
 877
 878                         rtc_time_to_tm(time, &tmp.time);
 879                         rtc_set_alarm(rtc_dev, &tmp);
 880                         cm_suspend_duration_ms += wakeup_ms;
 881                         return ret;
 882                 }
 883         }
 884
 885         if (rtc_dev)
 886                 rtc_set_alarm(rtc_dev, &rtc_wkalarm_save);
 887         return false;
 888 }
 889
 890 static void _cm_fbchk_in_suspend(struct charger_manager *cm)
 891 {
 892         unsigned long jiffy_now = jiffies;
 893
 894         if (!cm->fullbatt_vchk_jiffies_at)
 895                 return;
 896
 897         if (g_desc && g_desc->assume_timer_stops_in_suspend)
 898                 jiffy_now += msecs_to_jiffies(cm_suspend_duration_ms);
 899
 900         /* Execute now if it's going to be executed not too long after */
 901         jiffy_now += CM_JIFFIES_SMALL;
 902
 903         if (time_after_eq(jiffy_now, cm->fullbatt_vchk_jiffies_at))
 904                 fullbatt_vchk(&cm->fullbatt_vchk_work.work);
 905 }
 906
 907 /**
 908  * cm_suspend_again - Determine whether suspend again or not
 909  *
 910  * Returns true if the system should be suspended again
 911  * Returns false if the system should be woken up
 912  */
 913 bool cm_suspend_again(void)
 914 {
 915         struct charger_manager *cm;
 916         bool ret = false;
 917
 918         if (!g_desc || !g_desc->rtc_only_wakeup || !g_desc->rtc_only_wakeup() ||
 919             !cm_rtc_set)
 920                 return false;
 921
 922         if (cm_monitor())
 923                 goto out;
 924
 925         ret = true;
 926         mutex_lock(&cm_list_mtx);
 927         list_for_each_entry(cm, &cm_list, entry) {
 928                 _cm_fbchk_in_suspend(cm);
 929
 930                 if (cm->status_save_ext_pwr_inserted != is_ext_pwr_online(cm) ||
 931                     cm->status_save_batt != is_batt_present(cm)) {
 932                         ret = false;
 933                         break;
 934                 }
 935         }
 936         mutex_unlock(&cm_list_mtx);
 937
 938         cm_rtc_set = cm_setup_timer();
 939 out:
 940         /* It's about the time when the non-CM appointed timer goes off */
 941         if (rtc_wkalarm_save.enabled) {
 942                 unsigned long now;
 943                 struct rtc_time tmp;
 944
 945                 rtc_read_time(rtc_dev, &tmp);
 946                 rtc_tm_to_time(&tmp, &now);
 947
 948                 if (rtc_wkalarm_save_time &&
 949                     now + CM_RTC_SMALL >= rtc_wkalarm_save_time)
 950                         return false;
 951         }
 952         return ret;
 953 }
 954 EXPORT_SYMBOL_GPL(cm_suspend_again);
 955
 956 /**
 957  * setup_charger_manager - initialize charger_global_desc data
 958  * @gd: pointer to instance of charger_global_desc
 959  */
 960 int setup_charger_manager(struct charger_global_desc *gd)
 961 {
 962         if (!gd)
 963                 return -EINVAL;
 964
 965         if (rtc_dev)
 966                 rtc_class_close(rtc_dev);
 967         rtc_dev = NULL;
 968         g_desc = NULL;
 969
 970         if (!gd->rtc_only_wakeup) {
 971                 pr_err("The callback rtc_only_wakeup is not given.\n");
 972                 return -EINVAL;
 973         }
 974
 975         if (gd->rtc_name) {
 976                 rtc_dev = rtc_class_open(gd->rtc_name);
 977                 if (IS_ERR_OR_NULL(rtc_dev)) {
 978                         rtc_dev = NULL;
 979                         /* Retry at probe. RTC may be not registered yet */
 980                 }
 981         } else {
 982                 pr_warn("No wakeup timer is given for charger manager."
 983                         "In-suspend monitoring won't work.\n");
 984         }
 985
 986         g_desc = gd;
 987         return 0;
 988 }
 989 EXPORT_SYMBOL_GPL(setup_charger_manager);
 990
 991 /**
 992  * charger_extcon_work - enable/diable charger according to the state
 993  *                      of charger cable
 994  *
 995  * @work: work_struct of the function charger_extcon_work.
 996  */
 997 static void charger_extcon_work(struct work_struct *work)
 998 {
 999         struct charger_cable *cable =
1000                         container_of(work, struct charger_cable, wq);
1001         int ret;
1002
1003         if (cable->attached && cable->min_uA != 0 && cable->max_uA != 0) {
1004                 ret = regulator_set_current_limit(cable->charger->consumer,
1005                                         cable->min_uA, cable->max_uA);
1006                 if (ret < 0) {
1007                         pr_err("Cannot set current limit of %s (%s)\n",
1008                                 cable->charger->regulator_name, cable->name);
1009                         return;
1010                 }
1011
1012                 pr_info("Set current limit of %s : %duA ~ %duA\n",
1013                                         cable->charger->regulator_name,
1014                                         cable->min_uA, cable->max_uA);
1015         }
1016
1017         try_charger_enable(cable->cm, cable->attached);
1018 }
1019
1020 /**
1021  * charger_extcon_notifier - receive the state of charger cable
1022  *                      when registered cable is attached or detached.
1023  *
1024  * @self: the notifier block of the charger_extcon_notifier.
1025  * @event: the cable state.
1026  * @ptr: the data pointer of notifier block.
1027  */
1028 static int charger_extcon_notifier(struct notifier_block *self,
1029                         unsigned long event, void *ptr)
1030 {
1031         struct charger_cable *cable =
1032                 container_of(self, struct charger_cable, nb);
1033
1034         cable->attached = event;
1035         schedule_work(&cable->wq);
1036
1037         return NOTIFY_DONE;
1038 }
1039
1040 /**
1041  * charger_extcon_init - register external connector to use it
1042  *                      as the charger cable
1043  *
1044  * @cm: the Charger Manager representing the battery.
1045  * @cable: the Charger cable representing the external connector.
1046  */
1047 static int charger_extcon_init(struct charger_manager *cm,
1048                 struct charger_cable *cable)
1049 {
1050         int ret = 0;
1051
1052         /*
1053          * Charger manager use Extcon framework to identify
1054          * the charger cable among various external connector
1055          * cable (e.g., TA, USB, MHL, Dock).
1056          */
1057         INIT_WORK(&cable->wq, charger_extcon_work);
1058         cable->nb.notifier_call = charger_extcon_notifier;
1059         ret = extcon_register_interest(&cable->extcon_dev,
1060                         cable->extcon_name, cable->name, &cable->nb);
1061         if (ret < 0) {
1062                 pr_info("Cannot register extcon_dev for %s(cable: %s).\n",
1063                                 cable->extcon_name,
1064                                 cable->name);
1065                 ret = -EINVAL;
1066         }
1067
1068         return ret;
1069 }
1070
1071 static int charger_manager_probe(struct platform_device *pdev)
1072 {
1073         struct charger_desc *desc = dev_get_platdata(&pdev->dev);
1074         struct charger_manager *cm;
1075         int ret = 0, i = 0;
1076         int j = 0;
1077         union power_supply_propval val;
1078
1079         if (g_desc && !rtc_dev && g_desc->rtc_name) {
1080                 rtc_dev = rtc_class_open(g_desc->rtc_name);
1081                 if (IS_ERR_OR_NULL(rtc_dev)) {
1082                         rtc_dev = NULL;
1083                         dev_err(&pdev->dev, "Cannot get RTC %s.\n",
1084                                 g_desc->rtc_name);
1085                         ret = -ENODEV;
1086                         goto err_alloc;
1087                 }
1088         }
1089
1090         if (!desc) {
1091                 dev_err(&pdev->dev, "No platform data (desc) found.\n");
1092                 ret = -ENODEV;
1093                 goto err_alloc;
1094         }
1095
1096         cm = kzalloc(sizeof(struct charger_manager), GFP_KERNEL);
1097         if (!cm) {
1098                 dev_err(&pdev->dev, "Cannot allocate memory.\n");
1099                 ret = -ENOMEM;
1100                 goto err_alloc;
1101         }
1102
1103         /* Basic Values. Unspecified are Null or 0 */
1104         cm->dev = &pdev->dev;
1105         cm->desc = kzalloc(sizeof(struct charger_desc), GFP_KERNEL);
1106         if (!cm->desc) {
1107                 dev_err(&pdev->dev, "Cannot allocate memory.\n");
1108                 ret = -ENOMEM;
1109                 goto err_alloc_desc;
1110         }
1111         memcpy(cm->desc, desc, sizeof(struct charger_desc));
1112         cm->last_temp_mC = INT_MIN; /* denotes "unmeasured, yet" */
1113
1114         /*
1115          * The following two do not need to be errors.
1116          * Users may intentionally ignore those two features.
1117          */
1118         if (desc->fullbatt_uV == 0) {
1119                 dev_info(&pdev->dev, "Ignoring full-battery voltage threshold"
1120                                         " as it is not supplied.");
1121         }
1122         if (!desc->fullbatt_vchkdrop_ms || !desc->fullbatt_vchkdrop_uV) {
1123                 dev_info(&pdev->dev, "Disabling full-battery voltage drop "
1124                                 "checking mechanism as it is not supplied.");
1125                 desc->fullbatt_vchkdrop_ms = 0;
1126                 desc->fullbatt_vchkdrop_uV = 0;
1127         }
1128
1129         if (!desc->charger_regulators || desc->num_charger_regulators < 1) {
1130                 ret = -EINVAL;
1131                 dev_err(&pdev->dev, "charger_regulators undefined.\n");
1132                 goto err_no_charger;
1133         }
1134
1135         if (!desc->psy_charger_stat || !desc->psy_charger_stat[0]) {
1136                 dev_err(&pdev->dev, "No power supply defined.\n");
1137                 ret = -EINVAL;
1138                 goto err_no_charger_stat;
1139         }
1140
1141         /* Counting index only */
1142         while (desc->psy_charger_stat[i])
1143                 i++;
1144
1145         cm->charger_stat = kzalloc(sizeof(struct power_supply *) * (i + 1),
1146                                    GFP_KERNEL);
1147         if (!cm->charger_stat) {
1148                 ret = -ENOMEM;
1149                 goto err_no_charger_stat;
1150         }
1151
1152         for (i = 0; desc->psy_charger_stat[i]; i++) {
1153                 cm->charger_stat[i] = power_supply_get_by_name(
1154                                         desc->psy_charger_stat[i]);
1155                 if (!cm->charger_stat[i]) {
1156                         dev_err(&pdev->dev, "Cannot find power supply "
1157                                         "\"%s\"\n",
1158                                         desc->psy_charger_stat[i]);
1159                         ret = -ENODEV;
1160                         goto err_chg_stat;
1161                 }
1162         }
1163
1164         cm->fuel_gauge = power_supply_get_by_name(desc->psy_fuel_gauge);
1165         if (!cm->fuel_gauge) {
1166                 dev_err(&pdev->dev, "Cannot find power supply \"%s\"\n",
1167                                 desc->psy_fuel_gauge);
1168                 ret = -ENODEV;
1169                 goto err_chg_stat;
1170         }
1171
1172         if (desc->polling_interval_ms == 0 ||
1173             msecs_to_jiffies(desc->polling_interval_ms) <= CM_JIFFIES_SMALL) {
1174                 dev_err(&pdev->dev, "polling_interval_ms is too small\n");
1175                 ret = -EINVAL;
1176                 goto err_chg_stat;
1177         }
1178
1179         if (!desc->temperature_out_of_range) {
1180                 dev_err(&pdev->dev, "there is no temperature_out_of_range\n");
1181                 ret = -EINVAL;
1182                 goto err_chg_stat;
1183         }
1184
1185         platform_set_drvdata(pdev, cm);
1186
1187         memcpy(&cm->charger_psy, &psy_default, sizeof(psy_default));
1188
1189         if (!desc->psy_name) {
1190                 strncpy(cm->psy_name_buf, psy_default.name, PSY_NAME_MAX);
1191         } else {
1192                 strncpy(cm->psy_name_buf, desc->psy_name, PSY_NAME_MAX);
1193         }
1194         cm->charger_psy.name = cm->psy_name_buf;
1195
1196         /* Allocate for psy properties because they may vary */
1197         cm->charger_psy.properties = kzalloc(sizeof(enum power_supply_property)
1198                                 * (ARRAY_SIZE(default_charger_props) +
1199                                 NUM_CHARGER_PSY_OPTIONAL),
1200                                 GFP_KERNEL);
1201         if (!cm->charger_psy.properties) {
1202                 dev_err(&pdev->dev, "Cannot allocate for psy properties.\n");
1203                 ret = -ENOMEM;
1204                 goto err_chg_stat;
1205         }
1206         memcpy(cm->charger_psy.properties, default_charger_props,
1207                 sizeof(enum power_supply_property) *
1208                 ARRAY_SIZE(default_charger_props));
1209         cm->charger_psy.num_properties = psy_default.num_properties;
1210
1211         /* Find which optional psy-properties are available */
1212         if (!cm->fuel_gauge->get_property(cm->fuel_gauge,
1213                                           POWER_SUPPLY_PROP_CHARGE_NOW, &val)) {
1214                 cm->charger_psy.properties[cm->charger_psy.num_properties] =
1215                                 POWER_SUPPLY_PROP_CHARGE_NOW;
1216                 cm->charger_psy.num_properties++;
1217         }
1218         if (!cm->fuel_gauge->get_property(cm->fuel_gauge,
1219                                           POWER_SUPPLY_PROP_CURRENT_NOW,
1220                                           &val)) {
1221                 cm->charger_psy.properties[cm->charger_psy.num_properties] =
1222                                 POWER_SUPPLY_PROP_CURRENT_NOW;
1223                 cm->charger_psy.num_properties++;
1224         }
1225
1226         if (desc->measure_battery_temp) {
1227                 cm->charger_psy.properties[cm->charger_psy.num_properties] =
1228                                 POWER_SUPPLY_PROP_TEMP;
1229                 cm->charger_psy.num_properties++;
1230         } else {
1231                 cm->charger_psy.properties[cm->charger_psy.num_properties] =
1232                                 POWER_SUPPLY_PROP_TEMP_AMBIENT;
1233                 cm->charger_psy.num_properties++;
1234         }
1235
1236         INIT_DELAYED_WORK(&cm->fullbatt_vchk_work, fullbatt_vchk);
1237
1238         ret = power_supply_register(NULL, &cm->charger_psy);
1239         if (ret) {
1240                 dev_err(&pdev->dev, "Cannot register charger-manager with"
1241                                 " name \"%s\".\n", cm->charger_psy.name);
1242                 goto err_register;
1243         }
1244
1245         for (i = 0 ; i < desc->num_charger_regulators ; i++) {
1246                 struct charger_regulator *charger
1247                                         = &desc->charger_regulators[i];
1248
1249                 charger->consumer = regulator_get(&pdev->dev,
1250                                         charger->regulator_name);
1251                 if (charger->consumer == NULL) {
1252                         dev_err(&pdev->dev, "Cannot find charger(%s)n",
1253                                                 charger->regulator_name);
1254                         ret = -EINVAL;
1255                         goto err_chg_get;
1256                 }
1257
1258                 for (j = 0 ; j < charger->num_cables ; j++) {
1259                         struct charger_cable *cable = &charger->cables[j];
1260
1261                         ret = charger_extcon_init(cm, cable);
1262                         if (ret < 0) {
1263                                 dev_err(&pdev->dev, "Cannot find charger(%s)n",
1264                                                 charger->regulator_name);
1265                                 goto err_extcon;
1266                         }
1267                         cable->charger = charger;
1268                         cable->cm = cm;
1269                 }
1270         }
1271
1272         ret = try_charger_enable(cm, true);
1273         if (ret) {
1274                 dev_err(&pdev->dev, "Cannot enable charger regulators\n");
1275                 goto err_chg_enable;
1276         }
1277
1278         /* Add to the list */
1279         mutex_lock(&cm_list_mtx);
1280         list_add(&cm->entry, &cm_list);
1281         mutex_unlock(&cm_list_mtx);
1282
1283         /*
1284          * Charger-manager is capable of waking up the systme from sleep
1285          * when event is happend through cm_notify_event()
1286          */
1287         device_init_wakeup(&pdev->dev, true);
1288         device_set_wakeup_capable(&pdev->dev, false);
1289
1290         schedule_work(&setup_polling);
1291
1292         return 0;
1293
1294 err_chg_enable:
1295 err_extcon:
1296         for (i = 0 ; i < desc->num_charger_regulators ; i++) {
1297                 struct charger_regulator *charger
1298                                 = &desc->charger_regulators[i];
1299                 for (j = 0 ; j < charger->num_cables ; j++) {
1300                         struct charger_cable *cable = &charger->cables[j];
1301                         extcon_unregister_interest(&cable->extcon_dev);
1302                 }
1303         }
1304 err_chg_get:
1305         for (i = 0 ; i < desc->num_charger_regulators ; i++)
1306                 regulator_put(desc->charger_regulators[i].consumer);
1307
1308         power_supply_unregister(&cm->charger_psy);
1309 err_register:
1310         kfree(cm->charger_psy.properties);
1311 err_chg_stat:
1312         kfree(cm->charger_stat);
1313 err_no_charger_stat:
1314 err_no_charger:
1315         kfree(cm->desc);
1316 err_alloc_desc:
1317         kfree(cm);
1318 err_alloc:
1319         return ret;
1320 }
1321
1322 static int __devexit charger_manager_remove(struct platform_device *pdev)
1323 {
1324         struct charger_manager *cm = platform_get_drvdata(pdev);
1325         struct charger_desc *desc = cm->desc;
1326         int i = 0;
1327         int j = 0;
1328
1329         /* Remove from the list */
1330         mutex_lock(&cm_list_mtx);
1331         list_del(&cm->entry);
1332         mutex_unlock(&cm_list_mtx);
1333
1334         if (work_pending(&setup_polling))
1335                 cancel_work_sync(&setup_polling);
1336         if (delayed_work_pending(&cm_monitor_work))
1337                 cancel_delayed_work_sync(&cm_monitor_work);
1338
1339         for (i = 0 ; i < desc->num_charger_regulators ; i++) {
1340                 struct charger_regulator *charger
1341                                 = &desc->charger_regulators[i];
1342                 for (j = 0 ; j < charger->num_cables ; j++) {
1343                         struct charger_cable *cable = &charger->cables[j];
1344                         extcon_unregister_interest(&cable->extcon_dev);
1345                 }
1346         }
1347
1348         for (i = 0 ; i < desc->num_charger_regulators ; i++)
1349                 regulator_put(desc->charger_regulators[i].consumer);
1350
1351         power_supply_unregister(&cm->charger_psy);
1352
1353         try_charger_enable(cm, false);
1354
1355         kfree(cm->charger_psy.properties);
1356         kfree(cm->charger_stat);
1357         kfree(cm->desc);
1358         kfree(cm);
1359
1360         return 0;
1361 }
1362
1363 static const struct platform_device_id charger_manager_id[] = {
1364         { "charger-manager", 0 },
1365         { },
1366 };
1367 MODULE_DEVICE_TABLE(platform, charger_manager_id);
1368
1369 static int cm_suspend_noirq(struct device *dev)
1370 {
1371         int ret = 0;
1372
1373         if (device_may_wakeup(dev)) {
1374                 device_set_wakeup_capable(dev, false);
1375                 ret = -EAGAIN;
1376         }
1377
1378         return ret;
1379 }
1380
1381 static int cm_suspend_prepare(struct device *dev)
1382 {
1383         struct charger_manager *cm = dev_get_drvdata(dev);
1384
1385         if (!cm_suspended) {
1386                 if (rtc_dev) {
1387                         struct rtc_time tmp;
1388                         unsigned long now;
1389
1390                         rtc_read_alarm(rtc_dev, &rtc_wkalarm_save);
1391                         rtc_read_time(rtc_dev, &tmp);
1392
1393                         if (rtc_wkalarm_save.enabled) {
1394                                 rtc_tm_to_time(&rtc_wkalarm_save.time,
1395                                                &rtc_wkalarm_save_time);
1396                                 rtc_tm_to_time(&tmp, &now);
1397                                 if (now > rtc_wkalarm_save_time)
1398                                         rtc_wkalarm_save_time = 0;
1399                         } else {
1400                                 rtc_wkalarm_save_time = 0;
1401                         }
1402                 }
1403                 cm_suspended = true;
1404         }
1405
1406         if (delayed_work_pending(&cm->fullbatt_vchk_work))
1407                 cancel_delayed_work(&cm->fullbatt_vchk_work);
1408         cm->status_save_ext_pwr_inserted = is_ext_pwr_online(cm);
1409         cm->status_save_batt = is_batt_present(cm);
1410
1411         if (!cm_rtc_set) {
1412                 cm_suspend_duration_ms = 0;
1413                 cm_rtc_set = cm_setup_timer();
1414         }
1415
1416         return 0;
1417 }
1418
1419 static void cm_suspend_complete(struct device *dev)
1420 {
1421         struct charger_manager *cm = dev_get_drvdata(dev);
1422
1423         if (cm_suspended) {
1424                 if (rtc_dev) {
1425                         struct rtc_wkalrm tmp;
1426
1427                         rtc_read_alarm(rtc_dev, &tmp);
1428                         rtc_wkalarm_save.pending = tmp.pending;
1429                         rtc_set_alarm(rtc_dev, &rtc_wkalarm_save);
1430                 }
1431                 cm_suspended = false;
1432                 cm_rtc_set = false;
1433         }
1434
1435         /* Re-enqueue delayed work (fullbatt_vchk_work) */
1436         if (cm->fullbatt_vchk_jiffies_at) {
1437                 unsigned long delay = 0;
1438                 unsigned long now = jiffies + CM_JIFFIES_SMALL;
1439
1440                 if (time_after_eq(now, cm->fullbatt_vchk_jiffies_at)) {
1441                         delay = (unsigned long)((long)now
1442                                 - (long)(cm->fullbatt_vchk_jiffies_at));
1443                         delay = jiffies_to_msecs(delay);
1444                 } else {
1445                         delay = 0;
1446                 }
1447
1448                 /*
1449                  * Account for cm_suspend_duration_ms if
1450                  * assume_timer_stops_in_suspend is active
1451                  */
1452                 if (g_desc && g_desc->assume_timer_stops_in_suspend) {
1453                         if (delay > cm_suspend_duration_ms)
1454                                 delay -= cm_suspend_duration_ms;
1455                         else
1456                                 delay = 0;
1457                 }
1458
1459                 queue_delayed_work(cm_wq, &cm->fullbatt_vchk_work,
1460                                    msecs_to_jiffies(delay));
1461         }
1462         device_set_wakeup_capable(cm->dev, false);
1463         uevent_notify(cm, NULL);
1464 }
1465
1466 static const struct dev_pm_ops charger_manager_pm = {
1467         .prepare        = cm_suspend_prepare,
1468         .suspend_noirq  = cm_suspend_noirq,
1469         .complete       = cm_suspend_complete,
1470 };
1471
1472 static struct platform_driver charger_manager_driver = {
1473         .driver = {
1474                 .name = "charger-manager",
1475                 .owner = THIS_MODULE,
1476                 .pm = &charger_manager_pm,
1477         },
1478         .probe = charger_manager_probe,
1479         .remove = __devexit_p(charger_manager_remove),
1480         .id_table = charger_manager_id,
1481 };
1482
1483 static int __init charger_manager_init(void)
1484 {
1485         cm_wq = create_freezable_workqueue("charger_manager");
1486         INIT_DELAYED_WORK(&cm_monitor_work, cm_monitor_poller);
1487
1488         return platform_driver_register(&charger_manager_driver);
1489 }
1490 late_initcall(charger_manager_init);
1491
1492 static void __exit charger_manager_cleanup(void)
1493 {
1494         destroy_workqueue(cm_wq);
1495         cm_wq = NULL;
1496
1497         platform_driver_unregister(&charger_manager_driver);
1498 }
1499 module_exit(charger_manager_cleanup);
1500
1501 /**
1502  * find_power_supply - find the associated power_supply of charger
1503  * @cm: the Charger Manager representing the battery
1504  * @psy: pointer to instance of charger's power_supply
1505  */
1506 static bool find_power_supply(struct charger_manager *cm,
1507                         struct power_supply *psy)
1508 {
1509         int i;
1510         bool found = false;
1511
1512         for (i = 0; cm->charger_stat[i]; i++) {
1513                 if (psy == cm->charger_stat[i]) {
1514                         found = true;
1515                         break;
1516                 }
1517         }
1518
1519         return found;
1520 }
1521
1522 /**
1523  * cm_notify_event - charger driver notify Charger Manager of charger event
1524  * @psy: pointer to instance of charger's power_supply
1525  * @type: type of charger event
1526  * @msg: optional message passed to uevent_notify fuction
1527  */
1528 void cm_notify_event(struct power_supply *psy, enum cm_event_types type,
1529                      char *msg)
1530 {
1531         struct charger_manager *cm;
1532         bool found_power_supply = false;
1533
1534         if (psy == NULL)
1535                 return;
1536
1537         mutex_lock(&cm_list_mtx);
1538         list_for_each_entry(cm, &cm_list, entry) {
1539                 found_power_supply = find_power_supply(cm, psy);
1540                 if (found_power_supply)
1541                         break;
1542         }
1543         mutex_unlock(&cm_list_mtx);
1544
1545         if (!found_power_supply)
1546                 return;
1547
1548         switch (type) {
1549         case CM_EVENT_BATT_FULL:
1550                 fullbatt_handler(cm);
1551                 break;
1552         case CM_EVENT_BATT_OUT:
1553                 battout_handler(cm);
1554                 break;
1555         case CM_EVENT_BATT_IN:
1556         case CM_EVENT_EXT_PWR_IN_OUT ... CM_EVENT_CHG_START_STOP:
1557                 misc_event_handler(cm, type);
1558                 break;
1559         case CM_EVENT_UNKNOWN:
1560         case CM_EVENT_OTHERS:
1561                 uevent_notify(cm, msg ? msg : default_event_names[type]);
1562                 break;
1563         default:
1564                 dev_err(cm->dev, "%s type not specified.\n", __func__);
1565                 break;
1566         }
1567 }
1568 EXPORT_SYMBOL_GPL(cm_notify_event);
1569
1570 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
1571 MODULE_DESCRIPTION("Charger Manager");
1572 MODULE_LICENSE("GPL");