drivers/power/charger-manager.c

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