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 /*
  27  * Regard CM_JIFFIES_SMALL jiffies is small enough to ignore for
  28  * delayed works so that we can run delayed works with CM_JIFFIES_SMALL
  29  * without any delays.
  30  */
  31 #define CM_JIFFIES_SMALL        (2)
  32
  33 /* If y is valid (> 0) and smaller than x, do x = y */
  34 #define CM_MIN_VALID(x, y)      x = (((y > 0) && ((x) > (y))) ? (y) : (x))
  35
  36 /*
  37  * Regard CM_RTC_SMALL (sec) is small enough to ignore error in invoking
  38  * rtc alarm. It should be 2 or larger
  39  */
  40 #define CM_RTC_SMALL            (2)
  41
  42 #define UEVENT_BUF_SIZE         32
  43
  44 static LIST_HEAD(cm_list);
  45 static DEFINE_MUTEX(cm_list_mtx);
  46
  47 /* About in-suspend (suspend-again) monitoring */
  48 static struct rtc_device *rtc_dev;
  49 /*
  50  * Backup RTC alarm
  51  * Save the wakeup alarm before entering suspend-to-RAM
  52  */
  53 static struct rtc_wkalrm rtc_wkalarm_save;
  54 /* Backup RTC alarm time in terms of seconds since 01-01-1970 00:00:00 */
  55 static unsigned long rtc_wkalarm_save_time;
  56 static bool cm_suspended;
  57 static bool cm_rtc_set;
  58 static unsigned long cm_suspend_duration_ms;
  59
  60 /* Global charger-manager description */
  61 static struct charger_global_desc *g_desc; /* init with setup_charger_manager */
  62
  63 /**
  64  * is_batt_present - See if the battery presents in place.
  65  * @cm: the Charger Manager representing the battery.
  66  */
  67 static bool is_batt_present(struct charger_manager *cm)
  68 {
  69         union power_supply_propval val;
  70         bool present = false;
  71         int i, ret;
  72
  73         switch (cm->desc->battery_present) {
  74         case CM_FUEL_GAUGE:
  75                 ret = cm->fuel_gauge->get_property(cm->fuel_gauge,
  76                                 POWER_SUPPLY_PROP_PRESENT, &val);
  77                 if (ret == 0 && val.intval)
  78                         present = true;
  79                 break;
  80         case CM_CHARGER_STAT:
  81                 for (i = 0; cm->charger_stat[i]; i++) {
  82                         ret = cm->charger_stat[i]->get_property(
  83                                         cm->charger_stat[i],
  84                                         POWER_SUPPLY_PROP_PRESENT, &val);
  85                         if (ret == 0 && val.intval) {
  86                                 present = true;
  87                                 break;
  88                         }
  89                 }
  90                 break;
  91         }
  92
  93         return present;
  94 }
  95
  96 /**
  97  * is_ext_pwr_online - See if an external power source is attached to charge
  98  * @cm: the Charger Manager representing the battery.
  99  *
 100  * Returns true if at least one of the chargers of the battery has an external
 101  * power source attached to charge the battery regardless of whether it is
 102  * actually charging or not.
 103  */
 104 static bool is_ext_pwr_online(struct charger_manager *cm)
 105 {
 106         union power_supply_propval val;
 107         bool online = false;
 108         int i, ret;
 109
 110         /* If at least one of them has one, it's yes. */
 111         for (i = 0; cm->charger_stat[i]; i++) {
 112                 ret = cm->charger_stat[i]->get_property(
 113                                 cm->charger_stat[i],
 114                                 POWER_SUPPLY_PROP_ONLINE, &val);
 115                 if (ret == 0 && val.intval) {
 116                         online = true;
 117                         break;
 118                 }
 119         }
 120
 121         return online;
 122 }
 123
 124 /**
 125  * get_batt_uV - Get the voltage level of the battery
 126  * @cm: the Charger Manager representing the battery.
 127  * @uV: the voltage level returned.
 128  *
 129  * Returns 0 if there is no error.
 130  * Returns a negative value on error.
 131  */
 132 static int get_batt_uV(struct charger_manager *cm, int *uV)
 133 {
 134         union power_supply_propval val;
 135         int ret;
 136
 137         if (cm->fuel_gauge)
 138                 ret = cm->fuel_gauge->get_property(cm->fuel_gauge,
 139                                 POWER_SUPPLY_PROP_VOLTAGE_NOW, &val);
 140         else
 141                 return -ENODEV;
 142
 143         if (ret)
 144                 return ret;
 145
 146         *uV = val.intval;
 147         return 0;
 148 }
 149
 150 /**
 151  * is_charging - Returns true if the battery is being charged.
 152  * @cm: the Charger Manager representing the battery.
 153  */
 154 static bool is_charging(struct charger_manager *cm)
 155 {
 156         int i, ret;
 157         bool charging = false;
 158         union power_supply_propval val;
 159
 160         /* If there is no battery, it cannot be charged */
 161         if (!is_batt_present(cm))
 162                 return false;
 163
 164         /* If at least one of the charger is charging, return yes */
 165         for (i = 0; cm->charger_stat[i]; i++) {
 166                 /* 1. The charger sholuld not be DISABLED */
 167                 if (cm->emergency_stop)
 168                         continue;
 169                 if (!cm->charger_enabled)
 170                         continue;
 171
 172                 /* 2. The charger should be online (ext-power) */
 173                 ret = cm->charger_stat[i]->get_property(
 174                                 cm->charger_stat[i],
 175                                 POWER_SUPPLY_PROP_ONLINE, &val);
 176                 if (ret) {
 177                         dev_warn(cm->dev, "Cannot read ONLINE value from %s.\n",
 178                                         cm->desc->psy_charger_stat[i]);
 179                         continue;
 180                 }
 181                 if (val.intval == 0)
 182                         continue;
 183
 184                 /*
 185                  * 3. The charger should not be FULL, DISCHARGING,
 186                  * or NOT_CHARGING.
 187                  */
 188                 ret = cm->charger_stat[i]->get_property(
 189                                 cm->charger_stat[i],
 190                                 POWER_SUPPLY_PROP_STATUS, &val);
 191                 if (ret) {
 192                         dev_warn(cm->dev, "Cannot read STATUS value from %s.\n",
 193                                         cm->desc->psy_charger_stat[i]);
 194                         continue;
 195                 }
 196                 if (val.intval == POWER_SUPPLY_STATUS_FULL ||
 197                                 val.intval == POWER_SUPPLY_STATUS_DISCHARGING ||
 198                                 val.intval == POWER_SUPPLY_STATUS_NOT_CHARGING)
 199                         continue;
 200
 201                 /* Then, this is charging. */
 202                 charging = true;
 203                 break;
 204         }
 205
 206         return charging;
 207 }
 208
 209 /**
 210  * is_polling_required - Return true if need to continue polling for this CM.
 211  * @cm: the Charger Manager representing the battery.
 212  */
 213 static bool is_polling_required(struct charger_manager *cm)
 214 {
 215         switch (cm->desc->polling_mode) {
 216         case CM_POLL_DISABLE:
 217                 return false;
 218         case CM_POLL_ALWAYS:
 219                 return true;
 220         case CM_POLL_EXTERNAL_POWER_ONLY:
 221                 return is_ext_pwr_online(cm);
 222         case CM_POLL_CHARGING_ONLY:
 223                 return is_charging(cm);
 224         default:
 225                 dev_warn(cm->dev, "Incorrect polling_mode (%d)\n",
 226                         cm->desc->polling_mode);
 227         }
 228
 229         return false;
 230 }
 231
 232 /**
 233  * try_charger_enable - Enable/Disable chargers altogether
 234  * @cm: the Charger Manager representing the battery.
 235  * @enable: true: enable / false: disable
 236  *
 237  * Note that Charger Manager keeps the charger enabled regardless whether
 238  * the charger is charging or not (because battery is full or no external
 239  * power source exists) except when CM needs to disable chargers forcibly
 240  * bacause of emergency causes; when the battery is overheated or too cold.
 241  */
 242 static int try_charger_enable(struct charger_manager *cm, bool enable)
 243 {
 244         int err = 0, i;
 245         struct charger_desc *desc = cm->desc;
 246
 247         /* Ignore if it's redundent command */
 248         if (enable && cm->charger_enabled)
 249                 return 0;
 250         if (!enable && !cm->charger_enabled)
 251                 return 0;
 252
 253         if (enable) {
 254                 if (cm->emergency_stop)
 255                         return -EAGAIN;
 256                 err = regulator_bulk_enable(desc->num_charger_regulators,
 257                                         desc->charger_regulators);
 258         } else {
 259                 /*
 260                  * Abnormal battery state - Stop charging forcibly,
 261                  * even if charger was enabled at the other places
 262                  */
 263                 err = regulator_bulk_disable(desc->num_charger_regulators,
 264                                         desc->charger_regulators);
 265
 266                 for (i = 0; i < desc->num_charger_regulators; i++) {
 267                         if (regulator_is_enabled(
 268                                     desc->charger_regulators[i].consumer)) {
 269                                 regulator_force_disable(
 270                                         desc->charger_regulators[i].consumer);
 271                                 dev_warn(cm->dev,
 272                                         "Disable regulator(%s) forcibly.\n",
 273                                         desc->charger_regulators[i].supply);
 274                         }
 275                 }
 276         }
 277
 278         if (!err)
 279                 cm->charger_enabled = enable;
 280
 281         return err;
 282 }
 283
 284 /**
 285  * uevent_notify - Let users know something has changed.
 286  * @cm: the Charger Manager representing the battery.
 287  * @event: the event string.
 288  *
 289  * If @event is null, it implies that uevent_notify is called
 290  * by resume function. When called in the resume function, cm_suspended
 291  * should be already reset to false in order to let uevent_notify
 292  * notify the recent event during the suspend to users. While
 293  * suspended, uevent_notify does not notify users, but tracks
 294  * events so that uevent_notify can notify users later after resumed.
 295  */
 296 static void uevent_notify(struct charger_manager *cm, const char *event)
 297 {
 298         static char env_str[UEVENT_BUF_SIZE + 1] = "";
 299         static char env_str_save[UEVENT_BUF_SIZE + 1] = "";
 300
 301         if (cm_suspended) {
 302                 /* Nothing in suspended-event buffer */
 303                 if (env_str_save[0] == 0) {
 304                         if (!strncmp(env_str, event, UEVENT_BUF_SIZE))
 305                                 return; /* status not changed */
 306                         strncpy(env_str_save, event, UEVENT_BUF_SIZE);
 307                         return;
 308                 }
 309
 310                 if (!strncmp(env_str_save, event, UEVENT_BUF_SIZE))
 311                         return; /* Duplicated. */
 312                 else
 313                         strncpy(env_str_save, event, UEVENT_BUF_SIZE);
 314
 315                 return;
 316         }
 317
 318         if (event == NULL) {
 319                 /* No messages pending */
 320                 if (!env_str_save[0])
 321                         return;
 322
 323                 strncpy(env_str, env_str_save, UEVENT_BUF_SIZE);
 324                 kobject_uevent(&cm->dev->kobj, KOBJ_CHANGE);
 325                 env_str_save[0] = 0;
 326
 327                 return;
 328         }
 329
 330         /* status not changed */
 331         if (!strncmp(env_str, event, UEVENT_BUF_SIZE))
 332                 return;
 333
 334         /* save the status and notify the update */
 335         strncpy(env_str, event, UEVENT_BUF_SIZE);
 336         kobject_uevent(&cm->dev->kobj, KOBJ_CHANGE);
 337
 338         dev_info(cm->dev, event);
 339 }
 340
 341 /**
 342  * _cm_monitor - Monitor the temperature and return true for exceptions.
 343  * @cm: the Charger Manager representing the battery.
 344  *
 345  * Returns true if there is an event to notify for the battery.
 346  * (True if the status of "emergency_stop" changes)
 347  */
 348 static bool _cm_monitor(struct charger_manager *cm)
 349 {
 350         struct charger_desc *desc = cm->desc;
 351         int temp = desc->temperature_out_of_range(&cm->last_temp_mC);
 352
 353         dev_dbg(cm->dev, "monitoring (%2.2d.%3.3dC)\n",
 354                 cm->last_temp_mC / 1000, cm->last_temp_mC % 1000);
 355
 356         /* It has been stopped or charging already */
 357         if (!!temp == !!cm->emergency_stop)
 358                 return false;
 359
 360         if (temp) {
 361                 cm->emergency_stop = temp;
 362                 if (!try_charger_enable(cm, false)) {
 363                         if (temp > 0)
 364                                 uevent_notify(cm, "OVERHEAT");
 365                         else
 366                                 uevent_notify(cm, "COLD");
 367                 }
 368         } else {
 369                 cm->emergency_stop = 0;
 370                 if (!try_charger_enable(cm, true))
 371                         uevent_notify(cm, "CHARGING");
 372         }
 373
 374         return true;
 375 }
 376
 377 /**
 378  * cm_monitor - Monitor every battery.
 379  *
 380  * Returns true if there is an event to notify from any of the batteries.
 381  * (True if the status of "emergency_stop" changes)
 382  */
 383 static bool cm_monitor(void)
 384 {
 385         bool stop = false;
 386         struct charger_manager *cm;
 387
 388         mutex_lock(&cm_list_mtx);
 389
 390         list_for_each_entry(cm, &cm_list, entry)
 391                 stop = stop || _cm_monitor(cm);
 392
 393         mutex_unlock(&cm_list_mtx);
 394
 395         return stop;
 396 }
 397
 398 static int charger_get_property(struct power_supply *psy,
 399                 enum power_supply_property psp,
 400                 union power_supply_propval *val)
 401 {
 402         struct charger_manager *cm = container_of(psy,
 403                         struct charger_manager, charger_psy);
 404         struct charger_desc *desc = cm->desc;
 405         int i, ret = 0, uV;
 406
 407         switch (psp) {
 408         case POWER_SUPPLY_PROP_STATUS:
 409                 if (is_charging(cm))
 410                         val->intval = POWER_SUPPLY_STATUS_CHARGING;
 411                 else if (is_ext_pwr_online(cm))
 412                         val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
 413                 else
 414                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 415                 break;
 416         case POWER_SUPPLY_PROP_HEALTH:
 417                 if (cm->emergency_stop > 0)
 418                         val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
 419                 else if (cm->emergency_stop < 0)
 420                         val->intval = POWER_SUPPLY_HEALTH_COLD;
 421                 else
 422                         val->intval = POWER_SUPPLY_HEALTH_GOOD;
 423                 break;
 424         case POWER_SUPPLY_PROP_PRESENT:
 425                 if (is_batt_present(cm))
 426                         val->intval = 1;
 427                 else
 428                         val->intval = 0;
 429                 break;
 430         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 431                 ret = get_batt_uV(cm, &i);
 432                 val->intval = i;
 433                 break;
 434         case POWER_SUPPLY_PROP_CURRENT_NOW:
 435                 ret = cm->fuel_gauge->get_property(cm->fuel_gauge,
 436                                 POWER_SUPPLY_PROP_CURRENT_NOW, val);
 437                 break;
 438         case POWER_SUPPLY_PROP_TEMP:
 439                 /* in thenth of centigrade */
 440                 if (cm->last_temp_mC == INT_MIN)
 441                         desc->temperature_out_of_range(&cm->last_temp_mC);
 442                 val->intval = cm->last_temp_mC / 100;
 443                 if (!desc->measure_battery_temp)
 444                         ret = -ENODEV;
 445                 break;
 446         case POWER_SUPPLY_PROP_TEMP_AMBIENT:
 447                 /* in thenth of centigrade */
 448                 if (cm->last_temp_mC == INT_MIN)
 449                         desc->temperature_out_of_range(&cm->last_temp_mC);
 450                 val->intval = cm->last_temp_mC / 100;
 451                 if (desc->measure_battery_temp)
 452                         ret = -ENODEV;
 453                 break;
 454         case POWER_SUPPLY_PROP_CAPACITY:
 455                 if (!cm->fuel_gauge) {
 456                         ret = -ENODEV;
 457                         break;
 458                 }
 459
 460                 if (!is_batt_present(cm)) {
 461                         /* There is no battery. Assume 100% */
 462                         val->intval = 100;
 463                         break;
 464                 }
 465
 466                 ret = cm->fuel_gauge->get_property(cm->fuel_gauge,
 467                                         POWER_SUPPLY_PROP_CAPACITY, val);
 468                 if (ret)
 469                         break;
 470
 471                 if (val->intval > 100) {
 472                         val->intval = 100;
 473                         break;
 474                 }
 475                 if (val->intval < 0)
 476                         val->intval = 0;
 477
 478                 /* Do not adjust SOC when charging: voltage is overrated */
 479                 if (is_charging(cm))
 480                         break;
 481
 482                 /*
 483                  * If the capacity value is inconsistent, calibrate it base on
 484                  * the battery voltage values and the thresholds given as desc
 485                  */
 486                 ret = get_batt_uV(cm, &uV);
 487                 if (ret) {
 488                         /* Voltage information not available. No calibration */
 489                         ret = 0;
 490                         break;
 491                 }
 492
 493                 if (desc->fullbatt_uV > 0 && uV >= desc->fullbatt_uV &&
 494                     !is_charging(cm)) {
 495                         val->intval = 100;
 496                         break;
 497                 }
 498
 499                 break;
 500         case POWER_SUPPLY_PROP_ONLINE:
 501                 if (is_ext_pwr_online(cm))
 502                         val->intval = 1;
 503                 else
 504                         val->intval = 0;
 505                 break;
 506         case POWER_SUPPLY_PROP_CHARGE_FULL:
 507                 if (cm->fuel_gauge) {
 508                         if (cm->fuel_gauge->get_property(cm->fuel_gauge,
 509                             POWER_SUPPLY_PROP_CHARGE_FULL, val) == 0)
 510                                 break;
 511                 }
 512
 513                 if (is_ext_pwr_online(cm)) {
 514                         /* Not full if it's charging. */
 515                         if (is_charging(cm)) {
 516                                 val->intval = 0;
 517                                 break;
 518                         }
 519                         /*
 520                          * Full if it's powered but not charging andi
 521                          * not forced stop by emergency
 522                          */
 523                         if (!cm->emergency_stop) {
 524                                 val->intval = 1;
 525                                 break;
 526                         }
 527                 }
 528
 529                 /* Full if it's over the fullbatt voltage */
 530                 ret = get_batt_uV(cm, &uV);
 531                 if (!ret && desc->fullbatt_uV > 0 && uV >= desc->fullbatt_uV &&
 532                     !is_charging(cm)) {
 533                         val->intval = 1;
 534                         break;
 535                 }
 536
 537                 /* Full if the cap is 100 */
 538                 if (cm->fuel_gauge) {
 539                         ret = cm->fuel_gauge->get_property(cm->fuel_gauge,
 540                                         POWER_SUPPLY_PROP_CAPACITY, val);
 541                         if (!ret && val->intval >= 100 && !is_charging(cm)) {
 542                                 val->intval = 1;
 543                                 break;
 544                         }
 545                 }
 546
 547                 val->intval = 0;
 548                 ret = 0;
 549                 break;
 550         case POWER_SUPPLY_PROP_CHARGE_NOW:
 551                 if (is_charging(cm)) {
 552                         ret = cm->fuel_gauge->get_property(cm->fuel_gauge,
 553                                                 POWER_SUPPLY_PROP_CHARGE_NOW,
 554                                                 val);
 555                         if (ret) {
 556                                 val->intval = 1;
 557                                 ret = 0;
 558                         } else {
 559                                 /* If CHARGE_NOW is supplied, use it */
 560                                 val->intval = (val->intval > 0) ?
 561                                                 val->intval : 1;
 562                         }
 563                 } else {
 564                         val->intval = 0;
 565                 }
 566                 break;
 567         default:
 568                 return -EINVAL;
 569         }
 570         return ret;
 571 }
 572
 573 #define NUM_CHARGER_PSY_OPTIONAL        (4)
 574 static enum power_supply_property default_charger_props[] = {
 575         /* Guaranteed to provide */
 576         POWER_SUPPLY_PROP_STATUS,
 577         POWER_SUPPLY_PROP_HEALTH,
 578         POWER_SUPPLY_PROP_PRESENT,
 579         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 580         POWER_SUPPLY_PROP_CAPACITY,
 581         POWER_SUPPLY_PROP_ONLINE,
 582         POWER_SUPPLY_PROP_CHARGE_FULL,
 583         /*
 584          * Optional properties are:
 585          * POWER_SUPPLY_PROP_CHARGE_NOW,
 586          * POWER_SUPPLY_PROP_CURRENT_NOW,
 587          * POWER_SUPPLY_PROP_TEMP, and
 588          * POWER_SUPPLY_PROP_TEMP_AMBIENT,
 589          */
 590 };
 591
 592 static struct power_supply psy_default = {
 593         .name = "battery",
 594         .type = POWER_SUPPLY_TYPE_BATTERY,
 595         .properties = default_charger_props,
 596         .num_properties = ARRAY_SIZE(default_charger_props),
 597         .get_property = charger_get_property,
 598 };
 599
 600 /**
 601  * cm_setup_timer - For in-suspend monitoring setup wakeup alarm
 602  *                  for suspend_again.
 603  *
 604  * Returns true if the alarm is set for Charger Manager to use.
 605  * Returns false if
 606  *      cm_setup_timer fails to set an alarm,
 607  *      cm_setup_timer does not need to set an alarm for Charger Manager,
 608  *      or an alarm previously configured is to be used.
 609  */
 610 static bool cm_setup_timer(void)
 611 {
 612         struct charger_manager *cm;
 613         unsigned int wakeup_ms = UINT_MAX;
 614         bool ret = false;
 615
 616         mutex_lock(&cm_list_mtx);
 617
 618         list_for_each_entry(cm, &cm_list, entry) {
 619                 /* Skip if polling is not required for this CM */
 620                 if (!is_polling_required(cm) && !cm->emergency_stop)
 621                         continue;
 622                 if (cm->desc->polling_interval_ms == 0)
 623                         continue;
 624                 CM_MIN_VALID(wakeup_ms, cm->desc->polling_interval_ms);
 625         }
 626
 627         mutex_unlock(&cm_list_mtx);
 628
 629         if (wakeup_ms < UINT_MAX && wakeup_ms > 0) {
 630                 pr_info("Charger Manager wakeup timer: %u ms.\n", wakeup_ms);
 631                 if (rtc_dev) {
 632                         struct rtc_wkalrm tmp;
 633                         unsigned long time, now;
 634                         unsigned long add = DIV_ROUND_UP(wakeup_ms, 1000);
 635
 636                         /*
 637                          * Set alarm with the polling interval (wakeup_ms)
 638                          * except when rtc_wkalarm_save comes first.
 639                          * However, the alarm time should be NOW +
 640                          * CM_RTC_SMALL or later.
 641                          */
 642                         tmp.enabled = 1;
 643                         rtc_read_time(rtc_dev, &tmp.time);
 644                         rtc_tm_to_time(&tmp.time, &now);
 645                         if (add < CM_RTC_SMALL)
 646                                 add = CM_RTC_SMALL;
 647                         time = now + add;
 648
 649                         ret = true;
 650
 651                         if (rtc_wkalarm_save.enabled &&
 652                             rtc_wkalarm_save_time &&
 653                             rtc_wkalarm_save_time < time) {
 654                                 if (rtc_wkalarm_save_time < now + CM_RTC_SMALL)
 655                                         time = now + CM_RTC_SMALL;
 656                                 else
 657                                         time = rtc_wkalarm_save_time;
 658
 659                                 /* The timer is not appointed by CM */
 660                                 ret = false;
 661                         }
 662
 663                         pr_info("Waking up after %lu secs.\n",
 664                                         time - now);
 665
 666                         rtc_time_to_tm(time, &tmp.time);
 667                         rtc_set_alarm(rtc_dev, &tmp);
 668                         cm_suspend_duration_ms += wakeup_ms;
 669                         return ret;
 670                 }
 671         }
 672
 673         if (rtc_dev)
 674                 rtc_set_alarm(rtc_dev, &rtc_wkalarm_save);
 675         return false;
 676 }
 677
 678 /**
 679  * cm_suspend_again - Determine whether suspend again or not
 680  *
 681  * Returns true if the system should be suspended again
 682  * Returns false if the system should be woken up
 683  */
 684 bool cm_suspend_again(void)
 685 {
 686         struct charger_manager *cm;
 687         bool ret = false;
 688
 689         if (!g_desc || !g_desc->rtc_only_wakeup || !g_desc->rtc_only_wakeup() ||
 690             !cm_rtc_set)
 691                 return false;
 692
 693         if (cm_monitor())
 694                 goto out;
 695
 696         ret = true;
 697         mutex_lock(&cm_list_mtx);
 698         list_for_each_entry(cm, &cm_list, entry) {
 699                 if (cm->status_save_ext_pwr_inserted != is_ext_pwr_online(cm) ||
 700                     cm->status_save_batt != is_batt_present(cm))
 701                         ret = false;
 702         }
 703         mutex_unlock(&cm_list_mtx);
 704
 705         cm_rtc_set = cm_setup_timer();
 706 out:
 707         /* It's about the time when the non-CM appointed timer goes off */
 708         if (rtc_wkalarm_save.enabled) {
 709                 unsigned long now;
 710                 struct rtc_time tmp;
 711
 712                 rtc_read_time(rtc_dev, &tmp);
 713                 rtc_tm_to_time(&tmp, &now);
 714
 715                 if (rtc_wkalarm_save_time &&
 716                     now + CM_RTC_SMALL >= rtc_wkalarm_save_time)
 717                         return false;
 718         }
 719         return ret;
 720 }
 721 EXPORT_SYMBOL_GPL(cm_suspend_again);
 722
 723 /**
 724  * setup_charger_manager - initialize charger_global_desc data
 725  * @gd: pointer to instance of charger_global_desc
 726  */
 727 int setup_charger_manager(struct charger_global_desc *gd)
 728 {
 729         if (!gd)
 730                 return -EINVAL;
 731
 732         if (rtc_dev)
 733                 rtc_class_close(rtc_dev);
 734         rtc_dev = NULL;
 735         g_desc = NULL;
 736
 737         if (!gd->rtc_only_wakeup) {
 738                 pr_err("The callback rtc_only_wakeup is not given.\n");
 739                 return -EINVAL;
 740         }
 741
 742         if (gd->rtc_name) {
 743                 rtc_dev = rtc_class_open(gd->rtc_name);
 744                 if (IS_ERR_OR_NULL(rtc_dev)) {
 745                         rtc_dev = NULL;
 746                         /* Retry at probe. RTC may be not registered yet */
 747                 }
 748         } else {
 749                 pr_warn("No wakeup timer is given for charger manager."
 750                         "In-suspend monitoring won't work.\n");
 751         }
 752
 753         g_desc = gd;
 754         return 0;
 755 }
 756 EXPORT_SYMBOL_GPL(setup_charger_manager);
 757
 758 static int charger_manager_probe(struct platform_device *pdev)
 759 {
 760         struct charger_desc *desc = dev_get_platdata(&pdev->dev);
 761         struct charger_manager *cm;
 762         int ret = 0, i = 0;
 763         union power_supply_propval val;
 764
 765         if (g_desc && !rtc_dev && g_desc->rtc_name) {
 766                 rtc_dev = rtc_class_open(g_desc->rtc_name);
 767                 if (IS_ERR_OR_NULL(rtc_dev)) {
 768                         rtc_dev = NULL;
 769                         dev_err(&pdev->dev, "Cannot get RTC %s.\n",
 770                                 g_desc->rtc_name);
 771                         ret = -ENODEV;
 772                         goto err_alloc;
 773                 }
 774         }
 775
 776         if (!desc) {
 777                 dev_err(&pdev->dev, "No platform data (desc) found.\n");
 778                 ret = -ENODEV;
 779                 goto err_alloc;
 780         }
 781
 782         cm = kzalloc(sizeof(struct charger_manager), GFP_KERNEL);
 783         if (!cm) {
 784                 dev_err(&pdev->dev, "Cannot allocate memory.\n");
 785                 ret = -ENOMEM;
 786                 goto err_alloc;
 787         }
 788
 789         /* Basic Values. Unspecified are Null or 0 */
 790         cm->dev = &pdev->dev;
 791         cm->desc = kzalloc(sizeof(struct charger_desc), GFP_KERNEL);
 792         if (!cm->desc) {
 793                 dev_err(&pdev->dev, "Cannot allocate memory.\n");
 794                 ret = -ENOMEM;
 795                 goto err_alloc_desc;
 796         }
 797         memcpy(cm->desc, desc, sizeof(struct charger_desc));
 798         cm->last_temp_mC = INT_MIN; /* denotes "unmeasured, yet" */
 799
 800         if (!desc->charger_regulators || desc->num_charger_regulators < 1) {
 801                 ret = -EINVAL;
 802                 dev_err(&pdev->dev, "charger_regulators undefined.\n");
 803                 goto err_no_charger;
 804         }
 805
 806         if (!desc->psy_charger_stat || !desc->psy_charger_stat[0]) {
 807                 dev_err(&pdev->dev, "No power supply defined.\n");
 808                 ret = -EINVAL;
 809                 goto err_no_charger_stat;
 810         }
 811
 812         /* Counting index only */
 813         while (desc->psy_charger_stat[i])
 814                 i++;
 815
 816         cm->charger_stat = kzalloc(sizeof(struct power_supply *) * (i + 1),
 817                                    GFP_KERNEL);
 818         if (!cm->charger_stat) {
 819                 ret = -ENOMEM;
 820                 goto err_no_charger_stat;
 821         }
 822
 823         for (i = 0; desc->psy_charger_stat[i]; i++) {
 824                 cm->charger_stat[i] = power_supply_get_by_name(
 825                                         desc->psy_charger_stat[i]);
 826                 if (!cm->charger_stat[i]) {
 827                         dev_err(&pdev->dev, "Cannot find power supply "
 828                                         "\"%s\"\n",
 829                                         desc->psy_charger_stat[i]);
 830                         ret = -ENODEV;
 831                         goto err_chg_stat;
 832                 }
 833         }
 834
 835         cm->fuel_gauge = power_supply_get_by_name(desc->psy_fuel_gauge);
 836         if (!cm->fuel_gauge) {
 837                 dev_err(&pdev->dev, "Cannot find power supply \"%s\"\n",
 838                                 desc->psy_fuel_gauge);
 839                 ret = -ENODEV;
 840                 goto err_chg_stat;
 841         }
 842
 843         if (desc->polling_interval_ms == 0 ||
 844             msecs_to_jiffies(desc->polling_interval_ms) <= CM_JIFFIES_SMALL) {
 845                 dev_err(&pdev->dev, "polling_interval_ms is too small\n");
 846                 ret = -EINVAL;
 847                 goto err_chg_stat;
 848         }
 849
 850         if (!desc->temperature_out_of_range) {
 851                 dev_err(&pdev->dev, "there is no temperature_out_of_range\n");
 852                 ret = -EINVAL;
 853                 goto err_chg_stat;
 854         }
 855
 856         platform_set_drvdata(pdev, cm);
 857
 858         memcpy(&cm->charger_psy, &psy_default,
 859                                 sizeof(psy_default));
 860         if (!desc->psy_name) {
 861                 strncpy(cm->psy_name_buf, psy_default.name,
 862                                 PSY_NAME_MAX);
 863         } else {
 864                 strncpy(cm->psy_name_buf, desc->psy_name, PSY_NAME_MAX);
 865         }
 866         cm->charger_psy.name = cm->psy_name_buf;
 867
 868         /* Allocate for psy properties because they may vary */
 869         cm->charger_psy.properties = kzalloc(sizeof(enum power_supply_property)
 870                                 * (ARRAY_SIZE(default_charger_props) +
 871                                 NUM_CHARGER_PSY_OPTIONAL),
 872                                 GFP_KERNEL);
 873         if (!cm->charger_psy.properties) {
 874                 dev_err(&pdev->dev, "Cannot allocate for psy properties.\n");
 875                 ret = -ENOMEM;
 876                 goto err_chg_stat;
 877         }
 878         memcpy(cm->charger_psy.properties, default_charger_props,
 879                 sizeof(enum power_supply_property) *
 880                 ARRAY_SIZE(default_charger_props));
 881         cm->charger_psy.num_properties = psy_default.num_properties;
 882
 883         /* Find which optional psy-properties are available */
 884         if (!cm->fuel_gauge->get_property(cm->fuel_gauge,
 885                                           POWER_SUPPLY_PROP_CHARGE_NOW, &val)) {
 886                 cm->charger_psy.properties[cm->charger_psy.num_properties] =
 887                                 POWER_SUPPLY_PROP_CHARGE_NOW;
 888                 cm->charger_psy.num_properties++;
 889         }
 890         if (!cm->fuel_gauge->get_property(cm->fuel_gauge,
 891                                           POWER_SUPPLY_PROP_CURRENT_NOW,
 892                                           &val)) {
 893                 cm->charger_psy.properties[cm->charger_psy.num_properties] =
 894                                 POWER_SUPPLY_PROP_CURRENT_NOW;
 895                 cm->charger_psy.num_properties++;
 896         }
 897         if (!desc->measure_battery_temp) {
 898                 cm->charger_psy.properties[cm->charger_psy.num_properties] =
 899                                 POWER_SUPPLY_PROP_TEMP_AMBIENT;
 900                 cm->charger_psy.num_properties++;
 901         }
 902         if (desc->measure_battery_temp) {
 903                 cm->charger_psy.properties[cm->charger_psy.num_properties] =
 904                                 POWER_SUPPLY_PROP_TEMP;
 905                 cm->charger_psy.num_properties++;
 906         }
 907
 908         ret = power_supply_register(NULL, &cm->charger_psy);
 909         if (ret) {
 910                 dev_err(&pdev->dev, "Cannot register charger-manager with"
 911                                 " name \"%s\".\n", cm->charger_psy.name);
 912                 goto err_register;
 913         }
 914
 915         ret = regulator_bulk_get(&pdev->dev, desc->num_charger_regulators,
 916                                  desc->charger_regulators);
 917         if (ret) {
 918                 dev_err(&pdev->dev, "Cannot get charger regulators.\n");
 919                 goto err_bulk_get;
 920         }
 921
 922         ret = try_charger_enable(cm, true);
 923         if (ret) {
 924                 dev_err(&pdev->dev, "Cannot enable charger regulators\n");
 925                 goto err_chg_enable;
 926         }
 927
 928         /* Add to the list */
 929         mutex_lock(&cm_list_mtx);
 930         list_add(&cm->entry, &cm_list);
 931         mutex_unlock(&cm_list_mtx);
 932
 933         return 0;
 934
 935 err_chg_enable:
 936         if (desc->charger_regulators)
 937                 regulator_bulk_free(desc->num_charger_regulators,
 938                                         desc->charger_regulators);
 939 err_bulk_get:
 940         power_supply_unregister(&cm->charger_psy);
 941 err_register:
 942         kfree(cm->charger_psy.properties);
 943 err_chg_stat:
 944         kfree(cm->charger_stat);
 945 err_no_charger_stat:
 946 err_no_charger:
 947         kfree(cm->desc);
 948 err_alloc_desc:
 949         kfree(cm);
 950 err_alloc:
 951         return ret;
 952 }
 953
 954 static int __devexit charger_manager_remove(struct platform_device *pdev)
 955 {
 956         struct charger_manager *cm = platform_get_drvdata(pdev);
 957         struct charger_desc *desc = cm->desc;
 958
 959         /* Remove from the list */
 960         mutex_lock(&cm_list_mtx);
 961         list_del(&cm->entry);
 962         mutex_unlock(&cm_list_mtx);
 963
 964         if (desc->charger_regulators)
 965                 regulator_bulk_free(desc->num_charger_regulators,
 966                                         desc->charger_regulators);
 967
 968         power_supply_unregister(&cm->charger_psy);
 969         kfree(cm->charger_psy.properties);
 970         kfree(cm->charger_stat);
 971         kfree(cm->desc);
 972         kfree(cm);
 973
 974         return 0;
 975 }
 976
 977 const struct platform_device_id charger_manager_id[] = {
 978         { "charger-manager", 0 },
 979         { },
 980 };
 981
 982 static int cm_suspend_prepare(struct device *dev)
 983 {
 984         struct platform_device *pdev = container_of(dev, struct platform_device,
 985                                                     dev);
 986         struct charger_manager *cm = platform_get_drvdata(pdev);
 987
 988         if (!cm_suspended) {
 989                 if (rtc_dev) {
 990                         struct rtc_time tmp;
 991                         unsigned long now;
 992
 993                         rtc_read_alarm(rtc_dev, &rtc_wkalarm_save);
 994                         rtc_read_time(rtc_dev, &tmp);
 995
 996                         if (rtc_wkalarm_save.enabled) {
 997                                 rtc_tm_to_time(&rtc_wkalarm_save.time,
 998                                                &rtc_wkalarm_save_time);
 999                                 rtc_tm_to_time(&tmp, &now);
1000                                 if (now > rtc_wkalarm_save_time)
1001                                         rtc_wkalarm_save_time = 0;
1002                         } else {
1003                                 rtc_wkalarm_save_time = 0;
1004                         }
1005                 }
1006                 cm_suspended = true;
1007         }
1008
1009         cm->status_save_ext_pwr_inserted = is_ext_pwr_online(cm);
1010         cm->status_save_batt = is_batt_present(cm);
1011
1012         if (!cm_rtc_set) {
1013                 cm_suspend_duration_ms = 0;
1014                 cm_rtc_set = cm_setup_timer();
1015         }
1016
1017         return 0;
1018 }
1019
1020 static void cm_suspend_complete(struct device *dev)
1021 {
1022         struct platform_device *pdev = container_of(dev, struct platform_device,
1023                                                     dev);
1024         struct charger_manager *cm = platform_get_drvdata(pdev);
1025
1026         if (cm_suspended) {
1027                 if (rtc_dev) {
1028                         struct rtc_wkalrm tmp;
1029
1030                         rtc_read_alarm(rtc_dev, &tmp);
1031                         rtc_wkalarm_save.pending = tmp.pending;
1032                         rtc_set_alarm(rtc_dev, &rtc_wkalarm_save);
1033                 }
1034                 cm_suspended = false;
1035                 cm_rtc_set = false;
1036         }
1037
1038         uevent_notify(cm, NULL);
1039 }
1040
1041 static const struct dev_pm_ops charger_manager_pm = {
1042         .prepare        = cm_suspend_prepare,
1043         .complete       = cm_suspend_complete,
1044 };
1045
1046 static struct platform_driver charger_manager_driver = {
1047         .driver = {
1048                 .name = "charger-manager",
1049                 .owner = THIS_MODULE,
1050                 .pm = &charger_manager_pm,
1051         },
1052         .probe = charger_manager_probe,
1053         .remove = __devexit_p(charger_manager_remove),
1054         .id_table = charger_manager_id,
1055 };
1056
1057 static int __init charger_manager_init(void)
1058 {
1059         return platform_driver_register(&charger_manager_driver);
1060 }
1061 late_initcall(charger_manager_init);
1062
1063 static void __exit charger_manager_cleanup(void)
1064 {
1065         platform_driver_unregister(&charger_manager_driver);
1066 }
1067 module_exit(charger_manager_cleanup);
1068
1069 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
1070 MODULE_DESCRIPTION("Charger Manager");
1071 MODULE_LICENSE("GPL");
1072 MODULE_ALIAS("charger-manager");