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