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