drivers/power/supply/charger-manager.c

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This source file includes following definitions.
is_batt_present
is_ext_pwr_online
get_batt_uV
is_charging
is_full_charged
is_polling_required
try_charger_enable
try_charger_restart
uevent_notify
fullbatt_vchk
check_charging_duration
cm_get_battery_temperature_by_psy
cm_get_battery_temperature
cm_check_thermal_status
_cm_monitor
cm_monitor
_setup_polling
cm_monitor_poller
fullbatt_handler
battout_handler
misc_event_handler
charger_get_property
cm_setup_timer
charger_extcon_work
charger_extcon_notifier
charger_extcon_init
charger_manager_register_extcon
charger_name_show
charger_state_show
charger_externally_control_show
charger_externally_control_store
charger_manager_prepare_sysfs
cm_init_thermal_data
of_cm_parse_desc
cm_get_drv_data
cm_timer_func
charger_manager_probe
charger_manager_remove
cm_suspend_noirq
cm_need_to_awake
cm_suspend_prepare
cm_suspend_complete
charger_manager_init
charger_manager_cleanup
cm_notify_event
   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2011 Samsung Electronics Co., Ltd.
   4  * MyungJoo Ham <myungjoo.ham@samsung.com>
   5  *
   6  * This driver enables to monitor battery health and control charger
   7  * during suspend-to-mem.
   8  * Charger manager depends on other devices. Register this later than
   9  * the depending devices.
  10  *
  11 **/
  12 
  13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  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 #include <linux/sysfs.h>
  26 #include <linux/of.h>
  27 #include <linux/thermal.h>
  28 
  29 /*
  30  * Default temperature threshold for charging.
  31  * Every temperature units are in tenth of centigrade.
  32  */
  33 #define CM_DEFAULT_RECHARGE_TEMP_DIFF   50
  34 #define CM_DEFAULT_CHARGE_TEMP_MAX      500
  35 
  36 static const char * const default_event_names[] = {
  37         [CM_EVENT_UNKNOWN] = "Unknown",
  38         [CM_EVENT_BATT_FULL] = "Battery Full",
  39         [CM_EVENT_BATT_IN] = "Battery Inserted",
  40         [CM_EVENT_BATT_OUT] = "Battery Pulled Out",
  41         [CM_EVENT_BATT_OVERHEAT] = "Battery Overheat",
  42         [CM_EVENT_BATT_COLD] = "Battery Cold",
  43         [CM_EVENT_EXT_PWR_IN_OUT] = "External Power Attach/Detach",
  44         [CM_EVENT_CHG_START_STOP] = "Charging Start/Stop",
  45         [CM_EVENT_OTHERS] = "Other battery events"
  46 };
  47 
  48 /*
  49  * Regard CM_JIFFIES_SMALL jiffies is small enough to ignore for
  50  * delayed works so that we can run delayed works with CM_JIFFIES_SMALL
  51  * without any delays.
  52  */
  53 #define CM_JIFFIES_SMALL        (2)
  54 
  55 /* If y is valid (> 0) and smaller than x, do x = y */
  56 #define CM_MIN_VALID(x, y)      x = (((y > 0) && ((x) > (y))) ? (y) : (x))
  57 
  58 /*
  59  * Regard CM_RTC_SMALL (sec) is small enough to ignore error in invoking
  60  * rtc alarm. It should be 2 or larger
  61  */
  62 #define CM_RTC_SMALL            (2)
  63 
  64 #define UEVENT_BUF_SIZE         32
  65 
  66 static LIST_HEAD(cm_list);
  67 static DEFINE_MUTEX(cm_list_mtx);
  68 
  69 /* About in-suspend (suspend-again) monitoring */
  70 static struct alarm *cm_timer;
  71 
  72 static bool cm_suspended;
  73 static bool cm_timer_set;
  74 static unsigned long cm_suspend_duration_ms;
  75 
  76 /* About normal (not suspended) monitoring */
  77 static unsigned long polling_jiffy = ULONG_MAX; /* ULONG_MAX: no polling */
  78 static unsigned long next_polling; /* Next appointed polling time */
  79 static struct workqueue_struct *cm_wq; /* init at driver add */
  80 static struct delayed_work cm_monitor_work; /* init at driver add */
  81 
  82 /**
  83  * is_batt_present - See if the battery presents in place.
  84  * @cm: the Charger Manager representing the battery.
  85  */
  86 static bool is_batt_present(struct charger_manager *cm)
  87 {
  88         union power_supply_propval val;
  89         struct power_supply *psy;
  90         bool present = false;
  91         int i, ret;
  92 
  93         switch (cm->desc->battery_present) {
  94         case CM_BATTERY_PRESENT:
  95                 present = true;
  96                 break;
  97         case CM_NO_BATTERY:
  98                 break;
  99         case CM_FUEL_GAUGE:
 100                 psy = power_supply_get_by_name(cm->desc->psy_fuel_gauge);
 101                 if (!psy)
 102                         break;
 103 
 104                 ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_PRESENT,
 105                                 &val);
 106                 if (ret == 0 && val.intval)
 107                         present = true;
 108                 power_supply_put(psy);
 109                 break;
 110         case CM_CHARGER_STAT:
 111                 for (i = 0; cm->desc->psy_charger_stat[i]; i++) {
 112                         psy = power_supply_get_by_name(
 113                                         cm->desc->psy_charger_stat[i]);
 114                         if (!psy) {
 115                                 dev_err(cm->dev, "Cannot find power supply \"%s\"\n",
 116                                         cm->desc->psy_charger_stat[i]);
 117                                 continue;
 118                         }
 119 
 120                         ret = power_supply_get_property(psy,
 121                                 POWER_SUPPLY_PROP_PRESENT, &val);
 122                         power_supply_put(psy);
 123                         if (ret == 0 && val.intval) {
 124                                 present = true;
 125                                 break;
 126                         }
 127                 }
 128                 break;
 129         }
 130 
 131         return present;
 132 }
 133 
 134 /**
 135  * is_ext_pwr_online - See if an external power source is attached to charge
 136  * @cm: the Charger Manager representing the battery.
 137  *
 138  * Returns true if at least one of the chargers of the battery has an external
 139  * power source attached to charge the battery regardless of whether it is
 140  * actually charging or not.
 141  */
 142 static bool is_ext_pwr_online(struct charger_manager *cm)
 143 {
 144         union power_supply_propval val;
 145         struct power_supply *psy;
 146         bool online = false;
 147         int i, ret;
 148 
 149         /* If at least one of them has one, it's yes. */
 150         for (i = 0; cm->desc->psy_charger_stat[i]; i++) {
 151                 psy = power_supply_get_by_name(cm->desc->psy_charger_stat[i]);
 152                 if (!psy) {
 153                         dev_err(cm->dev, "Cannot find power supply \"%s\"\n",
 154                                         cm->desc->psy_charger_stat[i]);
 155                         continue;
 156                 }
 157 
 158                 ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_ONLINE,
 159                                 &val);
 160                 power_supply_put(psy);
 161                 if (ret == 0 && val.intval) {
 162                         online = true;
 163                         break;
 164                 }
 165         }
 166 
 167         return online;
 168 }
 169 
 170 /**
 171  * get_batt_uV - Get the voltage level of the battery
 172  * @cm: the Charger Manager representing the battery.
 173  * @uV: the voltage level returned.
 174  *
 175  * Returns 0 if there is no error.
 176  * Returns a negative value on error.
 177  */
 178 static int get_batt_uV(struct charger_manager *cm, int *uV)
 179 {
 180         union power_supply_propval val;
 181         struct power_supply *fuel_gauge;
 182         int ret;
 183 
 184         fuel_gauge = power_supply_get_by_name(cm->desc->psy_fuel_gauge);
 185         if (!fuel_gauge)
 186                 return -ENODEV;
 187 
 188         ret = power_supply_get_property(fuel_gauge,
 189                                 POWER_SUPPLY_PROP_VOLTAGE_NOW, &val);
 190         power_supply_put(fuel_gauge);
 191         if (ret)
 192                 return ret;
 193 
 194         *uV = val.intval;
 195         return 0;
 196 }
 197 
 198 /**
 199  * is_charging - Returns true if the battery is being charged.
 200  * @cm: the Charger Manager representing the battery.
 201  */
 202 static bool is_charging(struct charger_manager *cm)
 203 {
 204         int i, ret;
 205         bool charging = false;
 206         struct power_supply *psy;
 207         union power_supply_propval val;
 208 
 209         /* If there is no battery, it cannot be charged */
 210         if (!is_batt_present(cm))
 211                 return false;
 212 
 213         /* If at least one of the charger is charging, return yes */
 214         for (i = 0; cm->desc->psy_charger_stat[i]; i++) {
 215                 /* 1. The charger sholuld not be DISABLED */
 216                 if (cm->emergency_stop)
 217                         continue;
 218                 if (!cm->charger_enabled)
 219                         continue;
 220 
 221                 psy = power_supply_get_by_name(cm->desc->psy_charger_stat[i]);
 222                 if (!psy) {
 223                         dev_err(cm->dev, "Cannot find power supply \"%s\"\n",
 224                                         cm->desc->psy_charger_stat[i]);
 225                         continue;
 226                 }
 227 
 228                 /* 2. The charger should be online (ext-power) */
 229                 ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_ONLINE,
 230                                 &val);
 231                 if (ret) {
 232                         dev_warn(cm->dev, "Cannot read ONLINE value from %s\n",
 233                                  cm->desc->psy_charger_stat[i]);
 234                         power_supply_put(psy);
 235                         continue;
 236                 }
 237                 if (val.intval == 0) {
 238                         power_supply_put(psy);
 239                         continue;
 240                 }
 241 
 242                 /*
 243                  * 3. The charger should not be FULL, DISCHARGING,
 244                  * or NOT_CHARGING.
 245                  */
 246                 ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_STATUS,
 247                                 &val);
 248                 power_supply_put(psy);
 249                 if (ret) {
 250                         dev_warn(cm->dev, "Cannot read STATUS value from %s\n",
 251                                  cm->desc->psy_charger_stat[i]);
 252                         continue;
 253                 }
 254                 if (val.intval == POWER_SUPPLY_STATUS_FULL ||
 255                                 val.intval == POWER_SUPPLY_STATUS_DISCHARGING ||
 256                                 val.intval == POWER_SUPPLY_STATUS_NOT_CHARGING)
 257                         continue;
 258 
 259                 /* Then, this is charging. */
 260                 charging = true;
 261                 break;
 262         }
 263 
 264         return charging;
 265 }
 266 
 267 /**
 268  * is_full_charged - Returns true if the battery is fully charged.
 269  * @cm: the Charger Manager representing the battery.
 270  */
 271 static bool is_full_charged(struct charger_manager *cm)
 272 {
 273         struct charger_desc *desc = cm->desc;
 274         union power_supply_propval val;
 275         struct power_supply *fuel_gauge;
 276         bool is_full = false;
 277         int ret = 0;
 278         int uV;
 279 
 280         /* If there is no battery, it cannot be charged */
 281         if (!is_batt_present(cm))
 282                 return false;
 283 
 284         fuel_gauge = power_supply_get_by_name(cm->desc->psy_fuel_gauge);
 285         if (!fuel_gauge)
 286                 return false;
 287 
 288         if (desc->fullbatt_full_capacity > 0) {
 289                 val.intval = 0;
 290 
 291                 /* Not full if capacity of fuel gauge isn't full */
 292                 ret = power_supply_get_property(fuel_gauge,
 293                                 POWER_SUPPLY_PROP_CHARGE_FULL, &val);
 294                 if (!ret && val.intval > desc->fullbatt_full_capacity) {
 295                         is_full = true;
 296                         goto out;
 297                 }
 298         }
 299 
 300         /* Full, if it's over the fullbatt voltage */
 301         if (desc->fullbatt_uV > 0) {
 302                 ret = get_batt_uV(cm, &uV);
 303                 if (!ret && uV >= desc->fullbatt_uV) {
 304                         is_full = true;
 305                         goto out;
 306                 }
 307         }
 308 
 309         /* Full, if the capacity is more than fullbatt_soc */
 310         if (desc->fullbatt_soc > 0) {
 311                 val.intval = 0;
 312 
 313                 ret = power_supply_get_property(fuel_gauge,
 314                                 POWER_SUPPLY_PROP_CAPACITY, &val);
 315                 if (!ret && val.intval >= desc->fullbatt_soc) {
 316                         is_full = true;
 317                         goto out;
 318                 }
 319         }
 320 
 321 out:
 322         power_supply_put(fuel_gauge);
 323         return is_full;
 324 }
 325 
 326 /**
 327  * is_polling_required - Return true if need to continue polling for this CM.
 328  * @cm: the Charger Manager representing the battery.
 329  */
 330 static bool is_polling_required(struct charger_manager *cm)
 331 {
 332         switch (cm->desc->polling_mode) {
 333         case CM_POLL_DISABLE:
 334                 return false;
 335         case CM_POLL_ALWAYS:
 336                 return true;
 337         case CM_POLL_EXTERNAL_POWER_ONLY:
 338                 return is_ext_pwr_online(cm);
 339         case CM_POLL_CHARGING_ONLY:
 340                 return is_charging(cm);
 341         default:
 342                 dev_warn(cm->dev, "Incorrect polling_mode (%d)\n",
 343                          cm->desc->polling_mode);
 344         }
 345 
 346         return false;
 347 }
 348 
 349 /**
 350  * try_charger_enable - Enable/Disable chargers altogether
 351  * @cm: the Charger Manager representing the battery.
 352  * @enable: true: enable / false: disable
 353  *
 354  * Note that Charger Manager keeps the charger enabled regardless whether
 355  * the charger is charging or not (because battery is full or no external
 356  * power source exists) except when CM needs to disable chargers forcibly
 357  * because of emergency causes; when the battery is overheated or too cold.
 358  */
 359 static int try_charger_enable(struct charger_manager *cm, bool enable)
 360 {
 361         int err = 0, i;
 362         struct charger_desc *desc = cm->desc;
 363 
 364         /* Ignore if it's redundant command */
 365         if (enable == cm->charger_enabled)
 366                 return 0;
 367 
 368         if (enable) {
 369                 if (cm->emergency_stop)
 370                         return -EAGAIN;
 371 
 372                 /*
 373                  * Save start time of charging to limit
 374                  * maximum possible charging time.
 375                  */
 376                 cm->charging_start_time = ktime_to_ms(ktime_get());
 377                 cm->charging_end_time = 0;
 378 
 379                 for (i = 0 ; i < desc->num_charger_regulators ; i++) {
 380                         if (desc->charger_regulators[i].externally_control)
 381                                 continue;
 382 
 383                         err = regulator_enable(desc->charger_regulators[i].consumer);
 384                         if (err < 0) {
 385                                 dev_warn(cm->dev, "Cannot enable %s regulator\n",
 386                                          desc->charger_regulators[i].regulator_name);
 387                         }
 388                 }
 389         } else {
 390                 /*
 391                  * Save end time of charging to maintain fully charged state
 392                  * of battery after full-batt.
 393                  */
 394                 cm->charging_start_time = 0;
 395                 cm->charging_end_time = ktime_to_ms(ktime_get());
 396 
 397                 for (i = 0 ; i < desc->num_charger_regulators ; i++) {
 398                         if (desc->charger_regulators[i].externally_control)
 399                                 continue;
 400 
 401                         err = regulator_disable(desc->charger_regulators[i].consumer);
 402                         if (err < 0) {
 403                                 dev_warn(cm->dev, "Cannot disable %s regulator\n",
 404                                          desc->charger_regulators[i].regulator_name);
 405                         }
 406                 }
 407 
 408                 /*
 409                  * Abnormal battery state - Stop charging forcibly,
 410                  * even if charger was enabled at the other places
 411                  */
 412                 for (i = 0; i < desc->num_charger_regulators; i++) {
 413                         if (regulator_is_enabled(
 414                                     desc->charger_regulators[i].consumer)) {
 415                                 regulator_force_disable(
 416                                         desc->charger_regulators[i].consumer);
 417                                 dev_warn(cm->dev, "Disable regulator(%s) forcibly\n",
 418                                          desc->charger_regulators[i].regulator_name);
 419                         }
 420                 }
 421         }
 422 
 423         if (!err)
 424                 cm->charger_enabled = enable;
 425 
 426         return err;
 427 }
 428 
 429 /**
 430  * try_charger_restart - Restart charging.
 431  * @cm: the Charger Manager representing the battery.
 432  *
 433  * Restart charging by turning off and on the charger.
 434  */
 435 static int try_charger_restart(struct charger_manager *cm)
 436 {
 437         int err;
 438 
 439         if (cm->emergency_stop)
 440                 return -EAGAIN;
 441 
 442         err = try_charger_enable(cm, false);
 443         if (err)
 444                 return err;
 445 
 446         return try_charger_enable(cm, true);
 447 }
 448 
 449 /**
 450  * uevent_notify - Let users know something has changed.
 451  * @cm: the Charger Manager representing the battery.
 452  * @event: the event string.
 453  *
 454  * If @event is null, it implies that uevent_notify is called
 455  * by resume function. When called in the resume function, cm_suspended
 456  * should be already reset to false in order to let uevent_notify
 457  * notify the recent event during the suspend to users. While
 458  * suspended, uevent_notify does not notify users, but tracks
 459  * events so that uevent_notify can notify users later after resumed.
 460  */
 461 static void uevent_notify(struct charger_manager *cm, const char *event)
 462 {
 463         static char env_str[UEVENT_BUF_SIZE + 1] = "";
 464         static char env_str_save[UEVENT_BUF_SIZE + 1] = "";
 465 
 466         if (cm_suspended) {
 467                 /* Nothing in suspended-event buffer */
 468                 if (env_str_save[0] == 0) {
 469                         if (!strncmp(env_str, event, UEVENT_BUF_SIZE))
 470                                 return; /* status not changed */
 471                         strncpy(env_str_save, event, UEVENT_BUF_SIZE);
 472                         return;
 473                 }
 474 
 475                 if (!strncmp(env_str_save, event, UEVENT_BUF_SIZE))
 476                         return; /* Duplicated. */
 477                 strncpy(env_str_save, event, UEVENT_BUF_SIZE);
 478                 return;
 479         }
 480 
 481         if (event == NULL) {
 482                 /* No messages pending */
 483                 if (!env_str_save[0])
 484                         return;
 485 
 486                 strncpy(env_str, env_str_save, UEVENT_BUF_SIZE);
 487                 kobject_uevent(&cm->dev->kobj, KOBJ_CHANGE);
 488                 env_str_save[0] = 0;
 489 
 490                 return;
 491         }
 492 
 493         /* status not changed */
 494         if (!strncmp(env_str, event, UEVENT_BUF_SIZE))
 495                 return;
 496 
 497         /* save the status and notify the update */
 498         strncpy(env_str, event, UEVENT_BUF_SIZE);
 499         kobject_uevent(&cm->dev->kobj, KOBJ_CHANGE);
 500 
 501         dev_info(cm->dev, "%s\n", event);
 502 }
 503 
 504 /**
 505  * fullbatt_vchk - Check voltage drop some times after "FULL" event.
 506  * @work: the work_struct appointing the function
 507  *
 508  * If a user has designated "fullbatt_vchkdrop_ms/uV" values with
 509  * charger_desc, Charger Manager checks voltage drop after the battery
 510  * "FULL" event. It checks whether the voltage has dropped more than
 511  * fullbatt_vchkdrop_uV by calling this function after fullbatt_vchkrop_ms.
 512  */
 513 static void fullbatt_vchk(struct work_struct *work)
 514 {
 515         struct delayed_work *dwork = to_delayed_work(work);
 516         struct charger_manager *cm = container_of(dwork,
 517                         struct charger_manager, fullbatt_vchk_work);
 518         struct charger_desc *desc = cm->desc;
 519         int batt_uV, err, diff;
 520 
 521         /* remove the appointment for fullbatt_vchk */
 522         cm->fullbatt_vchk_jiffies_at = 0;
 523 
 524         if (!desc->fullbatt_vchkdrop_uV || !desc->fullbatt_vchkdrop_ms)
 525                 return;
 526 
 527         err = get_batt_uV(cm, &batt_uV);
 528         if (err) {
 529                 dev_err(cm->dev, "%s: get_batt_uV error(%d)\n", __func__, err);
 530                 return;
 531         }
 532 
 533         diff = desc->fullbatt_uV - batt_uV;
 534         if (diff < 0)
 535                 return;
 536 
 537         dev_info(cm->dev, "VBATT dropped %duV after full-batt\n", diff);
 538 
 539         if (diff > desc->fullbatt_vchkdrop_uV) {
 540                 try_charger_restart(cm);
 541                 uevent_notify(cm, "Recharging");
 542         }
 543 }
 544 
 545 /**
 546  * check_charging_duration - Monitor charging/discharging duration
 547  * @cm: the Charger Manager representing the battery.
 548  *
 549  * If whole charging duration exceed 'charging_max_duration_ms',
 550  * cm stop charging to prevent overcharge/overheat. If discharging
 551  * duration exceed 'discharging _max_duration_ms', charger cable is
 552  * attached, after full-batt, cm start charging to maintain fully
 553  * charged state for battery.
 554  */
 555 static int check_charging_duration(struct charger_manager *cm)
 556 {
 557         struct charger_desc *desc = cm->desc;
 558         u64 curr = ktime_to_ms(ktime_get());
 559         u64 duration;
 560         int ret = false;
 561 
 562         if (!desc->charging_max_duration_ms &&
 563                         !desc->discharging_max_duration_ms)
 564                 return ret;
 565 
 566         if (cm->charger_enabled) {
 567                 duration = curr - cm->charging_start_time;
 568 
 569                 if (duration > desc->charging_max_duration_ms) {
 570                         dev_info(cm->dev, "Charging duration exceed %ums\n",
 571                                  desc->charging_max_duration_ms);
 572                         uevent_notify(cm, "Discharging");
 573                         try_charger_enable(cm, false);
 574                         ret = true;
 575                 }
 576         } else if (is_ext_pwr_online(cm) && !cm->charger_enabled) {
 577                 duration = curr - cm->charging_end_time;
 578 
 579                 if (duration > desc->discharging_max_duration_ms &&
 580                                 is_ext_pwr_online(cm)) {
 581                         dev_info(cm->dev, "Discharging duration exceed %ums\n",
 582                                  desc->discharging_max_duration_ms);
 583                         uevent_notify(cm, "Recharging");
 584                         try_charger_enable(cm, true);
 585                         ret = true;
 586                 }
 587         }
 588 
 589         return ret;
 590 }
 591 
 592 static int cm_get_battery_temperature_by_psy(struct charger_manager *cm,
 593                                         int *temp)
 594 {
 595         struct power_supply *fuel_gauge;
 596         int ret;
 597 
 598         fuel_gauge = power_supply_get_by_name(cm->desc->psy_fuel_gauge);
 599         if (!fuel_gauge)
 600                 return -ENODEV;
 601 
 602         ret = power_supply_get_property(fuel_gauge,
 603                                 POWER_SUPPLY_PROP_TEMP,
 604                                 (union power_supply_propval *)temp);
 605         power_supply_put(fuel_gauge);
 606 
 607         return ret;
 608 }
 609 
 610 static int cm_get_battery_temperature(struct charger_manager *cm,
 611                                         int *temp)
 612 {
 613         int ret;
 614 
 615         if (!cm->desc->measure_battery_temp)
 616                 return -ENODEV;
 617 
 618 #ifdef CONFIG_THERMAL
 619         if (cm->tzd_batt) {
 620                 ret = thermal_zone_get_temp(cm->tzd_batt, temp);
 621                 if (!ret)
 622                         /* Calibrate temperature unit */
 623                         *temp /= 100;
 624         } else
 625 #endif
 626         {
 627                 /* if-else continued from CONFIG_THERMAL */
 628                 ret = cm_get_battery_temperature_by_psy(cm, temp);
 629         }
 630 
 631         return ret;
 632 }
 633 
 634 static int cm_check_thermal_status(struct charger_manager *cm)
 635 {
 636         struct charger_desc *desc = cm->desc;
 637         int temp, upper_limit, lower_limit;
 638         int ret = 0;
 639 
 640         ret = cm_get_battery_temperature(cm, &temp);
 641         if (ret) {
 642                 /* FIXME:
 643                  * No information of battery temperature might
 644                  * occur hazardous result. We have to handle it
 645                  * depending on battery type.
 646                  */
 647                 dev_err(cm->dev, "Failed to get battery temperature\n");
 648                 return 0;
 649         }
 650 
 651         upper_limit = desc->temp_max;
 652         lower_limit = desc->temp_min;
 653 
 654         if (cm->emergency_stop) {
 655                 upper_limit -= desc->temp_diff;
 656                 lower_limit += desc->temp_diff;
 657         }
 658 
 659         if (temp > upper_limit)
 660                 ret = CM_EVENT_BATT_OVERHEAT;
 661         else if (temp < lower_limit)
 662                 ret = CM_EVENT_BATT_COLD;
 663 
 664         return ret;
 665 }
 666 
 667 /**
 668  * _cm_monitor - Monitor the temperature and return true for exceptions.
 669  * @cm: the Charger Manager representing the battery.
 670  *
 671  * Returns true if there is an event to notify for the battery.
 672  * (True if the status of "emergency_stop" changes)
 673  */
 674 static bool _cm_monitor(struct charger_manager *cm)
 675 {
 676         int temp_alrt;
 677 
 678         temp_alrt = cm_check_thermal_status(cm);
 679 
 680         /* It has been stopped already */
 681         if (temp_alrt && cm->emergency_stop)
 682                 return false;
 683 
 684         /*
 685          * Check temperature whether overheat or cold.
 686          * If temperature is out of range normal state, stop charging.
 687          */
 688         if (temp_alrt) {
 689                 cm->emergency_stop = temp_alrt;
 690                 if (!try_charger_enable(cm, false))
 691                         uevent_notify(cm, default_event_names[temp_alrt]);
 692 
 693         /*
 694          * Check whole charging duration and discharging duration
 695          * after full-batt.
 696          */
 697         } else if (!cm->emergency_stop && check_charging_duration(cm)) {
 698                 dev_dbg(cm->dev,
 699                         "Charging/Discharging duration is out of range\n");
 700         /*
 701          * Check dropped voltage of battery. If battery voltage is more
 702          * dropped than fullbatt_vchkdrop_uV after fully charged state,
 703          * charger-manager have to recharge battery.
 704          */
 705         } else if (!cm->emergency_stop && is_ext_pwr_online(cm) &&
 706                         !cm->charger_enabled) {
 707                 fullbatt_vchk(&cm->fullbatt_vchk_work.work);
 708 
 709         /*
 710          * Check whether fully charged state to protect overcharge
 711          * if charger-manager is charging for battery.
 712          */
 713         } else if (!cm->emergency_stop && is_full_charged(cm) &&
 714                         cm->charger_enabled) {
 715                 dev_info(cm->dev, "EVENT_HANDLE: Battery Fully Charged\n");
 716                 uevent_notify(cm, default_event_names[CM_EVENT_BATT_FULL]);
 717 
 718                 try_charger_enable(cm, false);
 719 
 720                 fullbatt_vchk(&cm->fullbatt_vchk_work.work);
 721         } else {
 722                 cm->emergency_stop = 0;
 723                 if (is_ext_pwr_online(cm)) {
 724                         if (!try_charger_enable(cm, true))
 725                                 uevent_notify(cm, "CHARGING");
 726                 }
 727         }
 728 
 729         return true;
 730 }
 731 
 732 /**
 733  * cm_monitor - Monitor every battery.
 734  *
 735  * Returns true if there is an event to notify from any of the batteries.
 736  * (True if the status of "emergency_stop" changes)
 737  */
 738 static bool cm_monitor(void)
 739 {
 740         bool stop = false;
 741         struct charger_manager *cm;
 742 
 743         mutex_lock(&cm_list_mtx);
 744 
 745         list_for_each_entry(cm, &cm_list, entry) {
 746                 if (_cm_monitor(cm))
 747                         stop = true;
 748         }
 749 
 750         mutex_unlock(&cm_list_mtx);
 751 
 752         return stop;
 753 }
 754 
 755 /**
 756  * _setup_polling - Setup the next instance of polling.
 757  * @work: work_struct of the function _setup_polling.
 758  */
 759 static void _setup_polling(struct work_struct *work)
 760 {
 761         unsigned long min = ULONG_MAX;
 762         struct charger_manager *cm;
 763         bool keep_polling = false;
 764         unsigned long _next_polling;
 765 
 766         mutex_lock(&cm_list_mtx);
 767 
 768         list_for_each_entry(cm, &cm_list, entry) {
 769                 if (is_polling_required(cm) && cm->desc->polling_interval_ms) {
 770                         keep_polling = true;
 771 
 772                         if (min > cm->desc->polling_interval_ms)
 773                                 min = cm->desc->polling_interval_ms;
 774                 }
 775         }
 776 
 777         polling_jiffy = msecs_to_jiffies(min);
 778         if (polling_jiffy <= CM_JIFFIES_SMALL)
 779                 polling_jiffy = CM_JIFFIES_SMALL + 1;
 780 
 781         if (!keep_polling)
 782                 polling_jiffy = ULONG_MAX;
 783         if (polling_jiffy == ULONG_MAX)
 784                 goto out;
 785 
 786         WARN(cm_wq == NULL, "charger-manager: workqueue not initialized"
 787                             ". try it later. %s\n", __func__);
 788 
 789         /*
 790          * Use mod_delayed_work() iff the next polling interval should
 791          * occur before the currently scheduled one.  If @cm_monitor_work
 792          * isn't active, the end result is the same, so no need to worry
 793          * about stale @next_polling.
 794          */
 795         _next_polling = jiffies + polling_jiffy;
 796 
 797         if (time_before(_next_polling, next_polling)) {
 798                 mod_delayed_work(cm_wq, &cm_monitor_work, polling_jiffy);
 799                 next_polling = _next_polling;
 800         } else {
 801                 if (queue_delayed_work(cm_wq, &cm_monitor_work, polling_jiffy))
 802                         next_polling = _next_polling;
 803         }
 804 out:
 805         mutex_unlock(&cm_list_mtx);
 806 }
 807 static DECLARE_WORK(setup_polling, _setup_polling);
 808 
 809 /**
 810  * cm_monitor_poller - The Monitor / Poller.
 811  * @work: work_struct of the function cm_monitor_poller
 812  *
 813  * During non-suspended state, cm_monitor_poller is used to poll and monitor
 814  * the batteries.
 815  */
 816 static void cm_monitor_poller(struct work_struct *work)
 817 {
 818         cm_monitor();
 819         schedule_work(&setup_polling);
 820 }
 821 
 822 /**
 823  * fullbatt_handler - Event handler for CM_EVENT_BATT_FULL
 824  * @cm: the Charger Manager representing the battery.
 825  */
 826 static void fullbatt_handler(struct charger_manager *cm)
 827 {
 828         struct charger_desc *desc = cm->desc;
 829 
 830         if (!desc->fullbatt_vchkdrop_uV || !desc->fullbatt_vchkdrop_ms)
 831                 goto out;
 832 
 833         if (cm_suspended)
 834                 device_set_wakeup_capable(cm->dev, true);
 835 
 836         mod_delayed_work(cm_wq, &cm->fullbatt_vchk_work,
 837                          msecs_to_jiffies(desc->fullbatt_vchkdrop_ms));
 838         cm->fullbatt_vchk_jiffies_at = jiffies + msecs_to_jiffies(
 839                                        desc->fullbatt_vchkdrop_ms);
 840 
 841         if (cm->fullbatt_vchk_jiffies_at == 0)
 842                 cm->fullbatt_vchk_jiffies_at = 1;
 843 
 844 out:
 845         dev_info(cm->dev, "EVENT_HANDLE: Battery Fully Charged\n");
 846         uevent_notify(cm, default_event_names[CM_EVENT_BATT_FULL]);
 847 }
 848 
 849 /**
 850  * battout_handler - Event handler for CM_EVENT_BATT_OUT
 851  * @cm: the Charger Manager representing the battery.
 852  */
 853 static void battout_handler(struct charger_manager *cm)
 854 {
 855         if (cm_suspended)
 856                 device_set_wakeup_capable(cm->dev, true);
 857 
 858         if (!is_batt_present(cm)) {
 859                 dev_emerg(cm->dev, "Battery Pulled Out!\n");
 860                 uevent_notify(cm, default_event_names[CM_EVENT_BATT_OUT]);
 861         } else {
 862                 uevent_notify(cm, "Battery Reinserted?");
 863         }
 864 }
 865 
 866 /**
 867  * misc_event_handler - Handler for other events
 868  * @cm: the Charger Manager representing the battery.
 869  * @type: the Charger Manager representing the battery.
 870  */
 871 static void misc_event_handler(struct charger_manager *cm,
 872                         enum cm_event_types type)
 873 {
 874         if (cm_suspended)
 875                 device_set_wakeup_capable(cm->dev, true);
 876 
 877         if (is_polling_required(cm) && cm->desc->polling_interval_ms)
 878                 schedule_work(&setup_polling);
 879         uevent_notify(cm, default_event_names[type]);
 880 }
 881 
 882 static int charger_get_property(struct power_supply *psy,
 883                 enum power_supply_property psp,
 884                 union power_supply_propval *val)
 885 {
 886         struct charger_manager *cm = power_supply_get_drvdata(psy);
 887         struct charger_desc *desc = cm->desc;
 888         struct power_supply *fuel_gauge = NULL;
 889         int ret = 0;
 890         int uV;
 891 
 892         switch (psp) {
 893         case POWER_SUPPLY_PROP_STATUS:
 894                 if (is_charging(cm))
 895                         val->intval = POWER_SUPPLY_STATUS_CHARGING;
 896                 else if (is_ext_pwr_online(cm))
 897                         val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
 898                 else
 899                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 900                 break;
 901         case POWER_SUPPLY_PROP_HEALTH:
 902                 if (cm->emergency_stop > 0)
 903                         val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
 904                 else if (cm->emergency_stop < 0)
 905                         val->intval = POWER_SUPPLY_HEALTH_COLD;
 906                 else
 907                         val->intval = POWER_SUPPLY_HEALTH_GOOD;
 908                 break;
 909         case POWER_SUPPLY_PROP_PRESENT:
 910                 if (is_batt_present(cm))
 911                         val->intval = 1;
 912                 else
 913                         val->intval = 0;
 914                 break;
 915         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 916                 ret = get_batt_uV(cm, &val->intval);
 917                 break;
 918         case POWER_SUPPLY_PROP_CURRENT_NOW:
 919                 fuel_gauge = power_supply_get_by_name(cm->desc->psy_fuel_gauge);
 920                 if (!fuel_gauge) {
 921                         ret = -ENODEV;
 922                         break;
 923                 }
 924                 ret = power_supply_get_property(fuel_gauge,
 925                                 POWER_SUPPLY_PROP_CURRENT_NOW, val);
 926                 break;
 927         case POWER_SUPPLY_PROP_TEMP:
 928         case POWER_SUPPLY_PROP_TEMP_AMBIENT:
 929                 return cm_get_battery_temperature(cm, &val->intval);
 930         case POWER_SUPPLY_PROP_CAPACITY:
 931                 if (!is_batt_present(cm)) {
 932                         /* There is no battery. Assume 100% */
 933                         val->intval = 100;
 934                         break;
 935                 }
 936 
 937                 fuel_gauge = power_supply_get_by_name(cm->desc->psy_fuel_gauge);
 938                 if (!fuel_gauge) {
 939                         ret = -ENODEV;
 940                         break;
 941                 }
 942 
 943                 ret = power_supply_get_property(fuel_gauge,
 944                                         POWER_SUPPLY_PROP_CAPACITY, val);
 945                 if (ret)
 946                         break;
 947 
 948                 if (val->intval > 100) {
 949                         val->intval = 100;
 950                         break;
 951                 }
 952                 if (val->intval < 0)
 953                         val->intval = 0;
 954 
 955                 /* Do not adjust SOC when charging: voltage is overrated */
 956                 if (is_charging(cm))
 957                         break;
 958 
 959                 /*
 960                  * If the capacity value is inconsistent, calibrate it base on
 961                  * the battery voltage values and the thresholds given as desc
 962                  */
 963                 ret = get_batt_uV(cm, &uV);
 964                 if (ret) {
 965                         /* Voltage information not available. No calibration */
 966                         ret = 0;
 967                         break;
 968                 }
 969 
 970                 if (desc->fullbatt_uV > 0 && uV >= desc->fullbatt_uV &&
 971                     !is_charging(cm)) {
 972                         val->intval = 100;
 973                         break;
 974                 }
 975 
 976                 break;
 977         case POWER_SUPPLY_PROP_ONLINE:
 978                 if (is_ext_pwr_online(cm))
 979                         val->intval = 1;
 980                 else
 981                         val->intval = 0;
 982                 break;
 983         case POWER_SUPPLY_PROP_CHARGE_FULL:
 984                 if (is_full_charged(cm))
 985                         val->intval = 1;
 986                 else
 987                         val->intval = 0;
 988                 ret = 0;
 989                 break;
 990         case POWER_SUPPLY_PROP_CHARGE_NOW:
 991                 if (is_charging(cm)) {
 992                         fuel_gauge = power_supply_get_by_name(
 993                                         cm->desc->psy_fuel_gauge);
 994                         if (!fuel_gauge) {
 995                                 ret = -ENODEV;
 996                                 break;
 997                         }
 998 
 999                         ret = power_supply_get_property(fuel_gauge,
1000                                                 POWER_SUPPLY_PROP_CHARGE_NOW,
1001                                                 val);
1002                         if (ret) {
1003                                 val->intval = 1;
1004                                 ret = 0;
1005                         } else {
1006                                 /* If CHARGE_NOW is supplied, use it */
1007                                 val->intval = (val->intval > 0) ?
1008                                                 val->intval : 1;
1009                         }
1010                 } else {
1011                         val->intval = 0;
1012                 }
1013                 break;
1014         default:
1015                 return -EINVAL;
1016         }
1017         if (fuel_gauge)
1018                 power_supply_put(fuel_gauge);
1019         return ret;
1020 }
1021 
1022 #define NUM_CHARGER_PSY_OPTIONAL        (4)
1023 static enum power_supply_property default_charger_props[] = {
1024         /* Guaranteed to provide */
1025         POWER_SUPPLY_PROP_STATUS,
1026         POWER_SUPPLY_PROP_HEALTH,
1027         POWER_SUPPLY_PROP_PRESENT,
1028         POWER_SUPPLY_PROP_VOLTAGE_NOW,
1029         POWER_SUPPLY_PROP_CAPACITY,
1030         POWER_SUPPLY_PROP_ONLINE,
1031         POWER_SUPPLY_PROP_CHARGE_FULL,
1032         /*
1033          * Optional properties are:
1034          * POWER_SUPPLY_PROP_CHARGE_NOW,
1035          * POWER_SUPPLY_PROP_CURRENT_NOW,
1036          * POWER_SUPPLY_PROP_TEMP, and
1037          * POWER_SUPPLY_PROP_TEMP_AMBIENT,
1038          */
1039 };
1040 
1041 static const struct power_supply_desc psy_default = {
1042         .name = "battery",
1043         .type = POWER_SUPPLY_TYPE_BATTERY,
1044         .properties = default_charger_props,
1045         .num_properties = ARRAY_SIZE(default_charger_props),
1046         .get_property = charger_get_property,
1047         .no_thermal = true,
1048 };
1049 
1050 /**
1051  * cm_setup_timer - For in-suspend monitoring setup wakeup alarm
1052  *                  for suspend_again.
1053  *
1054  * Returns true if the alarm is set for Charger Manager to use.
1055  * Returns false if
1056  *      cm_setup_timer fails to set an alarm,
1057  *      cm_setup_timer does not need to set an alarm for Charger Manager,
1058  *      or an alarm previously configured is to be used.
1059  */
1060 static bool cm_setup_timer(void)
1061 {
1062         struct charger_manager *cm;
1063         unsigned int wakeup_ms = UINT_MAX;
1064         int timer_req = 0;
1065 
1066         if (time_after(next_polling, jiffies))
1067                 CM_MIN_VALID(wakeup_ms,
1068                         jiffies_to_msecs(next_polling - jiffies));
1069 
1070         mutex_lock(&cm_list_mtx);
1071         list_for_each_entry(cm, &cm_list, entry) {
1072                 unsigned int fbchk_ms = 0;
1073 
1074                 /* fullbatt_vchk is required. setup timer for that */
1075                 if (cm->fullbatt_vchk_jiffies_at) {
1076                         fbchk_ms = jiffies_to_msecs(cm->fullbatt_vchk_jiffies_at
1077                                                     - jiffies);
1078                         if (time_is_before_eq_jiffies(
1079                                 cm->fullbatt_vchk_jiffies_at) ||
1080                                 msecs_to_jiffies(fbchk_ms) < CM_JIFFIES_SMALL) {
1081                                 fullbatt_vchk(&cm->fullbatt_vchk_work.work);
1082                                 fbchk_ms = 0;
1083                         }
1084                 }
1085                 CM_MIN_VALID(wakeup_ms, fbchk_ms);
1086 
1087                 /* Skip if polling is not required for this CM */
1088                 if (!is_polling_required(cm) && !cm->emergency_stop)
1089                         continue;
1090                 timer_req++;
1091                 if (cm->desc->polling_interval_ms == 0)
1092                         continue;
1093                 CM_MIN_VALID(wakeup_ms, cm->desc->polling_interval_ms);
1094         }
1095         mutex_unlock(&cm_list_mtx);
1096 
1097         if (timer_req && cm_timer) {
1098                 ktime_t now, add;
1099 
1100                 /*
1101                  * Set alarm with the polling interval (wakeup_ms)
1102                  * The alarm time should be NOW + CM_RTC_SMALL or later.
1103                  */
1104                 if (wakeup_ms == UINT_MAX ||
1105                         wakeup_ms < CM_RTC_SMALL * MSEC_PER_SEC)
1106                         wakeup_ms = 2 * CM_RTC_SMALL * MSEC_PER_SEC;
1107 
1108                 pr_info("Charger Manager wakeup timer: %u ms\n", wakeup_ms);
1109 
1110                 now = ktime_get_boottime();
1111                 add = ktime_set(wakeup_ms / MSEC_PER_SEC,
1112                                 (wakeup_ms % MSEC_PER_SEC) * NSEC_PER_MSEC);
1113                 alarm_start(cm_timer, ktime_add(now, add));
1114 
1115                 cm_suspend_duration_ms = wakeup_ms;
1116 
1117                 return true;
1118         }
1119         return false;
1120 }
1121 
1122 /**
1123  * charger_extcon_work - enable/diable charger according to the state
1124  *                      of charger cable
1125  *
1126  * @work: work_struct of the function charger_extcon_work.
1127  */
1128 static void charger_extcon_work(struct work_struct *work)
1129 {
1130         struct charger_cable *cable =
1131                         container_of(work, struct charger_cable, wq);
1132         int ret;
1133 
1134         if (cable->attached && cable->min_uA != 0 && cable->max_uA != 0) {
1135                 ret = regulator_set_current_limit(cable->charger->consumer,
1136                                         cable->min_uA, cable->max_uA);
1137                 if (ret < 0) {
1138                         pr_err("Cannot set current limit of %s (%s)\n",
1139                                cable->charger->regulator_name, cable->name);
1140                         return;
1141                 }
1142 
1143                 pr_info("Set current limit of %s : %duA ~ %duA\n",
1144                         cable->charger->regulator_name,
1145                         cable->min_uA, cable->max_uA);
1146         }
1147 
1148         try_charger_enable(cable->cm, cable->attached);
1149 }
1150 
1151 /**
1152  * charger_extcon_notifier - receive the state of charger cable
1153  *                      when registered cable is attached or detached.
1154  *
1155  * @self: the notifier block of the charger_extcon_notifier.
1156  * @event: the cable state.
1157  * @ptr: the data pointer of notifier block.
1158  */
1159 static int charger_extcon_notifier(struct notifier_block *self,
1160                         unsigned long event, void *ptr)
1161 {
1162         struct charger_cable *cable =
1163                 container_of(self, struct charger_cable, nb);
1164 
1165         /*
1166          * The newly state of charger cable.
1167          * If cable is attached, cable->attached is true.
1168          */
1169         cable->attached = event;
1170 
1171         /*
1172          * Setup monitoring to check battery state
1173          * when charger cable is attached.
1174          */
1175         if (cable->attached && is_polling_required(cable->cm)) {
1176                 cancel_work_sync(&setup_polling);
1177                 schedule_work(&setup_polling);
1178         }
1179 
1180         /*
1181          * Setup work for controlling charger(regulator)
1182          * according to charger cable.
1183          */
1184         schedule_work(&cable->wq);
1185 
1186         return NOTIFY_DONE;
1187 }
1188 
1189 /**
1190  * charger_extcon_init - register external connector to use it
1191  *                      as the charger cable
1192  *
1193  * @cm: the Charger Manager representing the battery.
1194  * @cable: the Charger cable representing the external connector.
1195  */
1196 static int charger_extcon_init(struct charger_manager *cm,
1197                 struct charger_cable *cable)
1198 {
1199         int ret;
1200 
1201         /*
1202          * Charger manager use Extcon framework to identify
1203          * the charger cable among various external connector
1204          * cable (e.g., TA, USB, MHL, Dock).
1205          */
1206         INIT_WORK(&cable->wq, charger_extcon_work);
1207         cable->nb.notifier_call = charger_extcon_notifier;
1208         ret = extcon_register_interest(&cable->extcon_dev,
1209                         cable->extcon_name, cable->name, &cable->nb);
1210         if (ret < 0) {
1211                 pr_info("Cannot register extcon_dev for %s(cable: %s)\n",
1212                         cable->extcon_name, cable->name);
1213         }
1214 
1215         return ret;
1216 }
1217 
1218 /**
1219  * charger_manager_register_extcon - Register extcon device to receive state
1220  *                                   of charger cable.
1221  * @cm: the Charger Manager representing the battery.
1222  *
1223  * This function support EXTCON(External Connector) subsystem to detect the
1224  * state of charger cables for enabling or disabling charger(regulator) and
1225  * select the charger cable for charging among a number of external cable
1226  * according to policy of H/W board.
1227  */
1228 static int charger_manager_register_extcon(struct charger_manager *cm)
1229 {
1230         struct charger_desc *desc = cm->desc;
1231         struct charger_regulator *charger;
1232         int ret;
1233         int i;
1234         int j;
1235 
1236         for (i = 0; i < desc->num_charger_regulators; i++) {
1237                 charger = &desc->charger_regulators[i];
1238 
1239                 charger->consumer = regulator_get(cm->dev,
1240                                         charger->regulator_name);
1241                 if (IS_ERR(charger->consumer)) {
1242                         dev_err(cm->dev, "Cannot find charger(%s)\n",
1243                                 charger->regulator_name);
1244                         return PTR_ERR(charger->consumer);
1245                 }
1246                 charger->cm = cm;
1247 
1248                 for (j = 0; j < charger->num_cables; j++) {
1249                         struct charger_cable *cable = &charger->cables[j];
1250 
1251                         ret = charger_extcon_init(cm, cable);
1252                         if (ret < 0) {
1253                                 dev_err(cm->dev, "Cannot initialize charger(%s)\n",
1254                                         charger->regulator_name);
1255                                 return ret;
1256                         }
1257                         cable->charger = charger;
1258                         cable->cm = cm;
1259                 }
1260         }
1261 
1262         return 0;
1263 }
1264 
1265 /* help function of sysfs node to control charger(regulator) */
1266 static ssize_t charger_name_show(struct device *dev,
1267                                 struct device_attribute *attr, char *buf)
1268 {
1269         struct charger_regulator *charger
1270                 = container_of(attr, struct charger_regulator, attr_name);
1271 
1272         return sprintf(buf, "%s\n", charger->regulator_name);
1273 }
1274 
1275 static ssize_t charger_state_show(struct device *dev,
1276                                 struct device_attribute *attr, char *buf)
1277 {
1278         struct charger_regulator *charger
1279                 = container_of(attr, struct charger_regulator, attr_state);
1280         int state = 0;
1281 
1282         if (!charger->externally_control)
1283                 state = regulator_is_enabled(charger->consumer);
1284 
1285         return sprintf(buf, "%s\n", state ? "enabled" : "disabled");
1286 }
1287 
1288 static ssize_t charger_externally_control_show(struct device *dev,
1289                                 struct device_attribute *attr, char *buf)
1290 {
1291         struct charger_regulator *charger = container_of(attr,
1292                         struct charger_regulator, attr_externally_control);
1293 
1294         return sprintf(buf, "%d\n", charger->externally_control);
1295 }
1296 
1297 static ssize_t charger_externally_control_store(struct device *dev,
1298                                 struct device_attribute *attr, const char *buf,
1299                                 size_t count)
1300 {
1301         struct charger_regulator *charger
1302                 = container_of(attr, struct charger_regulator,
1303                                         attr_externally_control);
1304         struct charger_manager *cm = charger->cm;
1305         struct charger_desc *desc = cm->desc;
1306         int i;
1307         int ret;
1308         int externally_control;
1309         int chargers_externally_control = 1;
1310 
1311         ret = sscanf(buf, "%d", &externally_control);
1312         if (ret == 0) {
1313                 ret = -EINVAL;
1314                 return ret;
1315         }
1316 
1317         if (!externally_control) {
1318                 charger->externally_control = 0;
1319                 return count;
1320         }
1321 
1322         for (i = 0; i < desc->num_charger_regulators; i++) {
1323                 if (&desc->charger_regulators[i] != charger &&
1324                         !desc->charger_regulators[i].externally_control) {
1325                         /*
1326                          * At least, one charger is controlled by
1327                          * charger-manager
1328                          */
1329                         chargers_externally_control = 0;
1330                         break;
1331                 }
1332         }
1333 
1334         if (!chargers_externally_control) {
1335                 if (cm->charger_enabled) {
1336                         try_charger_enable(charger->cm, false);
1337                         charger->externally_control = externally_control;
1338                         try_charger_enable(charger->cm, true);
1339                 } else {
1340                         charger->externally_control = externally_control;
1341                 }
1342         } else {
1343                 dev_warn(cm->dev,
1344                          "'%s' regulator should be controlled in charger-manager because charger-manager must need at least one charger for charging\n",
1345                          charger->regulator_name);
1346         }
1347 
1348         return count;
1349 }
1350 
1351 /**
1352  * charger_manager_prepare_sysfs - Prepare sysfs entry for each charger
1353  * @cm: the Charger Manager representing the battery.
1354  *
1355  * This function add sysfs entry for charger(regulator) to control charger from
1356  * user-space. If some development board use one more chargers for charging
1357  * but only need one charger on specific case which is dependent on user
1358  * scenario or hardware restrictions, the user enter 1 or 0(zero) to '/sys/
1359  * class/power_supply/battery/charger.[index]/externally_control'. For example,
1360  * if user enter 1 to 'sys/class/power_supply/battery/charger.[index]/
1361  * externally_control, this charger isn't controlled from charger-manager and
1362  * always stay off state of regulator.
1363  */
1364 static int charger_manager_prepare_sysfs(struct charger_manager *cm)
1365 {
1366         struct charger_desc *desc = cm->desc;
1367         struct charger_regulator *charger;
1368         int chargers_externally_control = 1;
1369         char *name;
1370         int i;
1371 
1372         /* Create sysfs entry to control charger(regulator) */
1373         for (i = 0; i < desc->num_charger_regulators; i++) {
1374                 charger = &desc->charger_regulators[i];
1375 
1376                 name = devm_kasprintf(cm->dev, GFP_KERNEL, "charger.%d", i);
1377                 if (!name)
1378                         return -ENOMEM;
1379 
1380                 charger->attrs[0] = &charger->attr_name.attr;
1381                 charger->attrs[1] = &charger->attr_state.attr;
1382                 charger->attrs[2] = &charger->attr_externally_control.attr;
1383                 charger->attrs[3] = NULL;
1384 
1385                 charger->attr_grp.name = name;
1386                 charger->attr_grp.attrs = charger->attrs;
1387                 desc->sysfs_groups[i] = &charger->attr_grp;
1388 
1389                 sysfs_attr_init(&charger->attr_name.attr);
1390                 charger->attr_name.attr.name = "name";
1391                 charger->attr_name.attr.mode = 0444;
1392                 charger->attr_name.show = charger_name_show;
1393 
1394                 sysfs_attr_init(&charger->attr_state.attr);
1395                 charger->attr_state.attr.name = "state";
1396                 charger->attr_state.attr.mode = 0444;
1397                 charger->attr_state.show = charger_state_show;
1398 
1399                 sysfs_attr_init(&charger->attr_externally_control.attr);
1400                 charger->attr_externally_control.attr.name
1401                                 = "externally_control";
1402                 charger->attr_externally_control.attr.mode = 0644;
1403                 charger->attr_externally_control.show
1404                                 = charger_externally_control_show;
1405                 charger->attr_externally_control.store
1406                                 = charger_externally_control_store;
1407 
1408                 if (!desc->charger_regulators[i].externally_control ||
1409                                 !chargers_externally_control)
1410                         chargers_externally_control = 0;
1411 
1412                 dev_info(cm->dev, "'%s' regulator's externally_control is %d\n",
1413                          charger->regulator_name, charger->externally_control);
1414         }
1415 
1416         if (chargers_externally_control) {
1417                 dev_err(cm->dev, "Cannot register regulator because charger-manager must need at least one charger for charging battery\n");
1418                 return -EINVAL;
1419         }
1420 
1421         return 0;
1422 }
1423 
1424 static int cm_init_thermal_data(struct charger_manager *cm,
1425                 struct power_supply *fuel_gauge)
1426 {
1427         struct charger_desc *desc = cm->desc;
1428         union power_supply_propval val;
1429         int ret;
1430 
1431         /* Verify whether fuel gauge provides battery temperature */
1432         ret = power_supply_get_property(fuel_gauge,
1433                                         POWER_SUPPLY_PROP_TEMP, &val);
1434 
1435         if (!ret) {
1436                 cm->charger_psy_desc.properties[cm->charger_psy_desc.num_properties] =
1437                                 POWER_SUPPLY_PROP_TEMP;
1438                 cm->charger_psy_desc.num_properties++;
1439                 cm->desc->measure_battery_temp = true;
1440         }
1441 #ifdef CONFIG_THERMAL
1442         if (ret && desc->thermal_zone) {
1443                 cm->tzd_batt =
1444                         thermal_zone_get_zone_by_name(desc->thermal_zone);
1445                 if (IS_ERR(cm->tzd_batt))
1446                         return PTR_ERR(cm->tzd_batt);
1447 
1448                 /* Use external thermometer */
1449                 cm->charger_psy_desc.properties[cm->charger_psy_desc.num_properties] =
1450                                 POWER_SUPPLY_PROP_TEMP_AMBIENT;
1451                 cm->charger_psy_desc.num_properties++;
1452                 cm->desc->measure_battery_temp = true;
1453                 ret = 0;
1454         }
1455 #endif
1456         if (cm->desc->measure_battery_temp) {
1457                 /* NOTICE : Default allowable minimum charge temperature is 0 */
1458                 if (!desc->temp_max)
1459                         desc->temp_max = CM_DEFAULT_CHARGE_TEMP_MAX;
1460                 if (!desc->temp_diff)
1461                         desc->temp_diff = CM_DEFAULT_RECHARGE_TEMP_DIFF;
1462         }
1463 
1464         return ret;
1465 }
1466 
1467 static const struct of_device_id charger_manager_match[] = {
1468         {
1469                 .compatible = "charger-manager",
1470         },
1471         {},
1472 };
1473 
1474 static struct charger_desc *of_cm_parse_desc(struct device *dev)
1475 {
1476         struct charger_desc *desc;
1477         struct device_node *np = dev->of_node;
1478         u32 poll_mode = CM_POLL_DISABLE;
1479         u32 battery_stat = CM_NO_BATTERY;
1480         int num_chgs = 0;
1481 
1482         desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
1483         if (!desc)
1484                 return ERR_PTR(-ENOMEM);
1485 
1486         of_property_read_string(np, "cm-name", &desc->psy_name);
1487 
1488         of_property_read_u32(np, "cm-poll-mode", &poll_mode);
1489         desc->polling_mode = poll_mode;
1490 
1491         of_property_read_u32(np, "cm-poll-interval",
1492                                 &desc->polling_interval_ms);
1493 
1494         of_property_read_u32(np, "cm-fullbatt-vchkdrop-ms",
1495                                         &desc->fullbatt_vchkdrop_ms);
1496         of_property_read_u32(np, "cm-fullbatt-vchkdrop-volt",
1497                                         &desc->fullbatt_vchkdrop_uV);
1498         of_property_read_u32(np, "cm-fullbatt-voltage", &desc->fullbatt_uV);
1499         of_property_read_u32(np, "cm-fullbatt-soc", &desc->fullbatt_soc);
1500         of_property_read_u32(np, "cm-fullbatt-capacity",
1501                                         &desc->fullbatt_full_capacity);
1502 
1503         of_property_read_u32(np, "cm-battery-stat", &battery_stat);
1504         desc->battery_present = battery_stat;
1505 
1506         /* chargers */
1507         of_property_read_u32(np, "cm-num-chargers", &num_chgs);
1508         if (num_chgs) {
1509                 int i;
1510 
1511                 /* Allocate empty bin at the tail of array */
1512                 desc->psy_charger_stat = devm_kcalloc(dev,
1513                                                       num_chgs + 1,
1514                                                       sizeof(char *),
1515                                                       GFP_KERNEL);
1516                 if (!desc->psy_charger_stat)
1517                         return ERR_PTR(-ENOMEM);
1518 
1519                 for (i = 0; i < num_chgs; i++)
1520                         of_property_read_string_index(np, "cm-chargers",
1521                                                       i, &desc->psy_charger_stat[i]);
1522         }
1523 
1524         of_property_read_string(np, "cm-fuel-gauge", &desc->psy_fuel_gauge);
1525 
1526         of_property_read_string(np, "cm-thermal-zone", &desc->thermal_zone);
1527 
1528         of_property_read_u32(np, "cm-battery-cold", &desc->temp_min);
1529         if (of_get_property(np, "cm-battery-cold-in-minus", NULL))
1530                 desc->temp_min *= -1;
1531         of_property_read_u32(np, "cm-battery-hot", &desc->temp_max);
1532         of_property_read_u32(np, "cm-battery-temp-diff", &desc->temp_diff);
1533 
1534         of_property_read_u32(np, "cm-charging-max",
1535                                 &desc->charging_max_duration_ms);
1536         of_property_read_u32(np, "cm-discharging-max",
1537                                 &desc->discharging_max_duration_ms);
1538 
1539         /* battery charger regulators */
1540         desc->num_charger_regulators = of_get_child_count(np);
1541         if (desc->num_charger_regulators) {
1542                 struct charger_regulator *chg_regs;
1543                 struct device_node *child;
1544 
1545                 chg_regs = devm_kcalloc(dev,
1546                                         desc->num_charger_regulators,
1547                                         sizeof(*chg_regs),
1548                                         GFP_KERNEL);
1549                 if (!chg_regs)
1550                         return ERR_PTR(-ENOMEM);
1551 
1552                 desc->charger_regulators = chg_regs;
1553 
1554                 desc->sysfs_groups = devm_kcalloc(dev,
1555                                         desc->num_charger_regulators + 1,
1556                                         sizeof(*desc->sysfs_groups),
1557                                         GFP_KERNEL);
1558                 if (!desc->sysfs_groups)
1559                         return ERR_PTR(-ENOMEM);
1560 
1561                 for_each_child_of_node(np, child) {
1562                         struct charger_cable *cables;
1563                         struct device_node *_child;
1564 
1565                         of_property_read_string(child, "cm-regulator-name",
1566                                         &chg_regs->regulator_name);
1567 
1568                         /* charger cables */
1569                         chg_regs->num_cables = of_get_child_count(child);
1570                         if (chg_regs->num_cables) {
1571                                 cables = devm_kcalloc(dev,
1572                                                       chg_regs->num_cables,
1573                                                       sizeof(*cables),
1574                                                       GFP_KERNEL);
1575                                 if (!cables) {
1576                                         of_node_put(child);
1577                                         return ERR_PTR(-ENOMEM);
1578                                 }
1579 
1580                                 chg_regs->cables = cables;
1581 
1582                                 for_each_child_of_node(child, _child) {
1583                                         of_property_read_string(_child,
1584                                         "cm-cable-name", &cables->name);
1585                                         of_property_read_string(_child,
1586                                         "cm-cable-extcon",
1587                                         &cables->extcon_name);
1588                                         of_property_read_u32(_child,
1589                                         "cm-cable-min",
1590                                         &cables->min_uA);
1591                                         of_property_read_u32(_child,
1592                                         "cm-cable-max",
1593                                         &cables->max_uA);
1594                                         cables++;
1595                                 }
1596                         }
1597                         chg_regs++;
1598                 }
1599         }
1600         return desc;
1601 }
1602 
1603 static inline struct charger_desc *cm_get_drv_data(struct platform_device *pdev)
1604 {
1605         if (pdev->dev.of_node)
1606                 return of_cm_parse_desc(&pdev->dev);
1607         return dev_get_platdata(&pdev->dev);
1608 }
1609 
1610 static enum alarmtimer_restart cm_timer_func(struct alarm *alarm, ktime_t now)
1611 {
1612         cm_timer_set = false;
1613         return ALARMTIMER_NORESTART;
1614 }
1615 
1616 static int charger_manager_probe(struct platform_device *pdev)
1617 {
1618         struct charger_desc *desc = cm_get_drv_data(pdev);
1619         struct charger_manager *cm;
1620         int ret, i = 0;
1621         int j = 0;
1622         union power_supply_propval val;
1623         struct power_supply *fuel_gauge;
1624         struct power_supply_config psy_cfg = {};
1625 
1626         if (IS_ERR(desc)) {
1627                 dev_err(&pdev->dev, "No platform data (desc) found\n");
1628                 return PTR_ERR(desc);
1629         }
1630 
1631         cm = devm_kzalloc(&pdev->dev, sizeof(*cm), GFP_KERNEL);
1632         if (!cm)
1633                 return -ENOMEM;
1634 
1635         /* Basic Values. Unspecified are Null or 0 */
1636         cm->dev = &pdev->dev;
1637         cm->desc = desc;
1638         psy_cfg.drv_data = cm;
1639 
1640         /* Initialize alarm timer */
1641         if (alarmtimer_get_rtcdev()) {
1642                 cm_timer = devm_kzalloc(cm->dev, sizeof(*cm_timer), GFP_KERNEL);
1643                 if (!cm_timer)
1644                         return -ENOMEM;
1645                 alarm_init(cm_timer, ALARM_BOOTTIME, cm_timer_func);
1646         }
1647 
1648         /*
1649          * Some of the following do not need to be errors.
1650          * Users may intentionally ignore those features.
1651          */
1652         if (desc->fullbatt_uV == 0) {
1653                 dev_info(&pdev->dev, "Ignoring full-battery voltage threshold as it is not supplied\n");
1654         }
1655         if (!desc->fullbatt_vchkdrop_ms || !desc->fullbatt_vchkdrop_uV) {
1656                 dev_info(&pdev->dev, "Disabling full-battery voltage drop checking mechanism as it is not supplied\n");
1657                 desc->fullbatt_vchkdrop_ms = 0;
1658                 desc->fullbatt_vchkdrop_uV = 0;
1659         }
1660         if (desc->fullbatt_soc == 0) {
1661                 dev_info(&pdev->dev, "Ignoring full-battery soc(state of charge) threshold as it is not supplied\n");
1662         }
1663         if (desc->fullbatt_full_capacity == 0) {
1664                 dev_info(&pdev->dev, "Ignoring full-battery full capacity threshold as it is not supplied\n");
1665         }
1666 
1667         if (!desc->charger_regulators || desc->num_charger_regulators < 1) {
1668                 dev_err(&pdev->dev, "charger_regulators undefined\n");
1669                 return -EINVAL;
1670         }
1671 
1672         if (!desc->psy_charger_stat || !desc->psy_charger_stat[0]) {
1673                 dev_err(&pdev->dev, "No power supply defined\n");
1674                 return -EINVAL;
1675         }
1676 
1677         if (!desc->psy_fuel_gauge) {
1678                 dev_err(&pdev->dev, "No fuel gauge power supply defined\n");
1679                 return -EINVAL;
1680         }
1681 
1682         /* Check if charger's supplies are present at probe */
1683         for (i = 0; desc->psy_charger_stat[i]; i++) {
1684                 struct power_supply *psy;
1685 
1686                 psy = power_supply_get_by_name(desc->psy_charger_stat[i]);
1687                 if (!psy) {
1688                         dev_err(&pdev->dev, "Cannot find power supply \"%s\"\n",
1689                                 desc->psy_charger_stat[i]);
1690                         return -ENODEV;
1691                 }
1692                 power_supply_put(psy);
1693         }
1694 
1695         if (cm->desc->polling_mode != CM_POLL_DISABLE &&
1696             (desc->polling_interval_ms == 0 ||
1697              msecs_to_jiffies(desc->polling_interval_ms) <= CM_JIFFIES_SMALL)) {
1698                 dev_err(&pdev->dev, "polling_interval_ms is too small\n");
1699                 return -EINVAL;
1700         }
1701 
1702         if (!desc->charging_max_duration_ms ||
1703                         !desc->discharging_max_duration_ms) {
1704                 dev_info(&pdev->dev, "Cannot limit charging duration checking mechanism to prevent overcharge/overheat and control discharging duration\n");
1705                 desc->charging_max_duration_ms = 0;
1706                 desc->discharging_max_duration_ms = 0;
1707         }
1708 
1709         platform_set_drvdata(pdev, cm);
1710 
1711         memcpy(&cm->charger_psy_desc, &psy_default, sizeof(psy_default));
1712 
1713         if (!desc->psy_name)
1714                 strncpy(cm->psy_name_buf, psy_default.name, PSY_NAME_MAX);
1715         else
1716                 strncpy(cm->psy_name_buf, desc->psy_name, PSY_NAME_MAX);
1717         cm->charger_psy_desc.name = cm->psy_name_buf;
1718 
1719         /* Allocate for psy properties because they may vary */
1720         cm->charger_psy_desc.properties =
1721                 devm_kcalloc(&pdev->dev,
1722                              ARRAY_SIZE(default_charger_props) +
1723                                 NUM_CHARGER_PSY_OPTIONAL,
1724                              sizeof(enum power_supply_property), GFP_KERNEL);
1725         if (!cm->charger_psy_desc.properties)
1726                 return -ENOMEM;
1727 
1728         memcpy(cm->charger_psy_desc.properties, default_charger_props,
1729                 sizeof(enum power_supply_property) *
1730                 ARRAY_SIZE(default_charger_props));
1731         cm->charger_psy_desc.num_properties = psy_default.num_properties;
1732 
1733         /* Find which optional psy-properties are available */
1734         fuel_gauge = power_supply_get_by_name(desc->psy_fuel_gauge);
1735         if (!fuel_gauge) {
1736                 dev_err(&pdev->dev, "Cannot find power supply \"%s\"\n",
1737                         desc->psy_fuel_gauge);
1738                 return -ENODEV;
1739         }
1740         if (!power_supply_get_property(fuel_gauge,
1741                                           POWER_SUPPLY_PROP_CHARGE_NOW, &val)) {
1742                 cm->charger_psy_desc.properties[cm->charger_psy_desc.num_properties] =
1743                                 POWER_SUPPLY_PROP_CHARGE_NOW;
1744                 cm->charger_psy_desc.num_properties++;
1745         }
1746         if (!power_supply_get_property(fuel_gauge,
1747                                           POWER_SUPPLY_PROP_CURRENT_NOW,
1748                                           &val)) {
1749                 cm->charger_psy_desc.properties[cm->charger_psy_desc.num_properties] =
1750                                 POWER_SUPPLY_PROP_CURRENT_NOW;
1751                 cm->charger_psy_desc.num_properties++;
1752         }
1753 
1754         ret = cm_init_thermal_data(cm, fuel_gauge);
1755         if (ret) {
1756                 dev_err(&pdev->dev, "Failed to initialize thermal data\n");
1757                 cm->desc->measure_battery_temp = false;
1758         }
1759         power_supply_put(fuel_gauge);
1760 
1761         INIT_DELAYED_WORK(&cm->fullbatt_vchk_work, fullbatt_vchk);
1762 
1763         /* Register sysfs entry for charger(regulator) */
1764         ret = charger_manager_prepare_sysfs(cm);
1765         if (ret < 0) {
1766                 dev_err(&pdev->dev,
1767                         "Cannot prepare sysfs entry of regulators\n");
1768                 return ret;
1769         }
1770         psy_cfg.attr_grp = desc->sysfs_groups;
1771 
1772         cm->charger_psy = power_supply_register(&pdev->dev,
1773                                                 &cm->charger_psy_desc,
1774                                                 &psy_cfg);
1775         if (IS_ERR(cm->charger_psy)) {
1776                 dev_err(&pdev->dev, "Cannot register charger-manager with name \"%s\"\n",
1777                         cm->charger_psy_desc.name);
1778                 return PTR_ERR(cm->charger_psy);
1779         }
1780 
1781         /* Register extcon device for charger cable */
1782         ret = charger_manager_register_extcon(cm);
1783         if (ret < 0) {
1784                 dev_err(&pdev->dev, "Cannot initialize extcon device\n");
1785                 goto err_reg_extcon;
1786         }
1787 
1788         /* Add to the list */
1789         mutex_lock(&cm_list_mtx);
1790         list_add(&cm->entry, &cm_list);
1791         mutex_unlock(&cm_list_mtx);
1792 
1793         /*
1794          * Charger-manager is capable of waking up the systme from sleep
1795          * when event is happened through cm_notify_event()
1796          */
1797         device_init_wakeup(&pdev->dev, true);
1798         device_set_wakeup_capable(&pdev->dev, false);
1799 
1800         /*
1801          * Charger-manager have to check the charging state right after
1802          * initialization of charger-manager and then update current charging
1803          * state.
1804          */
1805         cm_monitor();
1806 
1807         schedule_work(&setup_polling);
1808 
1809         return 0;
1810 
1811 err_reg_extcon:
1812         for (i = 0; i < desc->num_charger_regulators; i++) {
1813                 struct charger_regulator *charger;
1814 
1815                 charger = &desc->charger_regulators[i];
1816                 for (j = 0; j < charger->num_cables; j++) {
1817                         struct charger_cable *cable = &charger->cables[j];
1818                         /* Remove notifier block if only edev exists */
1819                         if (cable->extcon_dev.edev)
1820                                 extcon_unregister_interest(&cable->extcon_dev);
1821                 }
1822 
1823                 regulator_put(desc->charger_regulators[i].consumer);
1824         }
1825 
1826         power_supply_unregister(cm->charger_psy);
1827 
1828         return ret;
1829 }
1830 
1831 static int charger_manager_remove(struct platform_device *pdev)
1832 {
1833         struct charger_manager *cm = platform_get_drvdata(pdev);
1834         struct charger_desc *desc = cm->desc;
1835         int i = 0;
1836         int j = 0;
1837 
1838         /* Remove from the list */
1839         mutex_lock(&cm_list_mtx);
1840         list_del(&cm->entry);
1841         mutex_unlock(&cm_list_mtx);
1842 
1843         cancel_work_sync(&setup_polling);
1844         cancel_delayed_work_sync(&cm_monitor_work);
1845 
1846         for (i = 0 ; i < desc->num_charger_regulators ; i++) {
1847                 struct charger_regulator *charger
1848                                 = &desc->charger_regulators[i];
1849                 for (j = 0 ; j < charger->num_cables ; j++) {
1850                         struct charger_cable *cable = &charger->cables[j];
1851                         extcon_unregister_interest(&cable->extcon_dev);
1852                 }
1853         }
1854 
1855         for (i = 0 ; i < desc->num_charger_regulators ; i++)
1856                 regulator_put(desc->charger_regulators[i].consumer);
1857 
1858         power_supply_unregister(cm->charger_psy);
1859 
1860         try_charger_enable(cm, false);
1861 
1862         return 0;
1863 }
1864 
1865 static const struct platform_device_id charger_manager_id[] = {
1866         { "charger-manager", 0 },
1867         { },
1868 };
1869 MODULE_DEVICE_TABLE(platform, charger_manager_id);
1870 
1871 static int cm_suspend_noirq(struct device *dev)
1872 {
1873         if (device_may_wakeup(dev)) {
1874                 device_set_wakeup_capable(dev, false);
1875                 return -EAGAIN;
1876         }
1877 
1878         return 0;
1879 }
1880 
1881 static bool cm_need_to_awake(void)
1882 {
1883         struct charger_manager *cm;
1884 
1885         if (cm_timer)
1886                 return false;
1887 
1888         mutex_lock(&cm_list_mtx);
1889         list_for_each_entry(cm, &cm_list, entry) {
1890                 if (is_charging(cm)) {
1891                         mutex_unlock(&cm_list_mtx);
1892                         return true;
1893                 }
1894         }
1895         mutex_unlock(&cm_list_mtx);
1896 
1897         return false;
1898 }
1899 
1900 static int cm_suspend_prepare(struct device *dev)
1901 {
1902         struct charger_manager *cm = dev_get_drvdata(dev);
1903 
1904         if (cm_need_to_awake())
1905                 return -EBUSY;
1906 
1907         if (!cm_suspended)
1908                 cm_suspended = true;
1909 
1910         cm_timer_set = cm_setup_timer();
1911 
1912         if (cm_timer_set) {
1913                 cancel_work_sync(&setup_polling);
1914                 cancel_delayed_work_sync(&cm_monitor_work);
1915                 cancel_delayed_work(&cm->fullbatt_vchk_work);
1916         }
1917 
1918         return 0;
1919 }
1920 
1921 static void cm_suspend_complete(struct device *dev)
1922 {
1923         struct charger_manager *cm = dev_get_drvdata(dev);
1924 
1925         if (cm_suspended)
1926                 cm_suspended = false;
1927 
1928         if (cm_timer_set) {
1929                 ktime_t remain;
1930 
1931                 alarm_cancel(cm_timer);
1932                 cm_timer_set = false;
1933                 remain = alarm_expires_remaining(cm_timer);
1934                 cm_suspend_duration_ms -= ktime_to_ms(remain);
1935                 schedule_work(&setup_polling);
1936         }
1937 
1938         _cm_monitor(cm);
1939 
1940         /* Re-enqueue delayed work (fullbatt_vchk_work) */
1941         if (cm->fullbatt_vchk_jiffies_at) {
1942                 unsigned long delay = 0;
1943                 unsigned long now = jiffies + CM_JIFFIES_SMALL;
1944 
1945                 if (time_after_eq(now, cm->fullbatt_vchk_jiffies_at)) {
1946                         delay = (unsigned long)((long)now
1947                                 - (long)(cm->fullbatt_vchk_jiffies_at));
1948                         delay = jiffies_to_msecs(delay);
1949                 } else {
1950                         delay = 0;
1951                 }
1952 
1953                 /*
1954                  * Account for cm_suspend_duration_ms with assuming that
1955                  * timer stops in suspend.
1956                  */
1957                 if (delay > cm_suspend_duration_ms)
1958                         delay -= cm_suspend_duration_ms;
1959                 else
1960                         delay = 0;
1961 
1962                 queue_delayed_work(cm_wq, &cm->fullbatt_vchk_work,
1963                                    msecs_to_jiffies(delay));
1964         }
1965         device_set_wakeup_capable(cm->dev, false);
1966 }
1967 
1968 static const struct dev_pm_ops charger_manager_pm = {
1969         .prepare        = cm_suspend_prepare,
1970         .suspend_noirq  = cm_suspend_noirq,
1971         .complete       = cm_suspend_complete,
1972 };
1973 
1974 static struct platform_driver charger_manager_driver = {
1975         .driver = {
1976                 .name = "charger-manager",
1977                 .pm = &charger_manager_pm,
1978                 .of_match_table = charger_manager_match,
1979         },
1980         .probe = charger_manager_probe,
1981         .remove = charger_manager_remove,
1982         .id_table = charger_manager_id,
1983 };
1984 
1985 static int __init charger_manager_init(void)
1986 {
1987         cm_wq = create_freezable_workqueue("charger_manager");
1988         if (unlikely(!cm_wq))
1989                 return -ENOMEM;
1990 
1991         INIT_DELAYED_WORK(&cm_monitor_work, cm_monitor_poller);
1992 
1993         return platform_driver_register(&charger_manager_driver);
1994 }
1995 late_initcall(charger_manager_init);
1996 
1997 static void __exit charger_manager_cleanup(void)
1998 {
1999         destroy_workqueue(cm_wq);
2000         cm_wq = NULL;
2001 
2002         platform_driver_unregister(&charger_manager_driver);
2003 }
2004 module_exit(charger_manager_cleanup);
2005 
2006 /**
2007  * cm_notify_event - charger driver notify Charger Manager of charger event
2008  * @psy: pointer to instance of charger's power_supply
2009  * @type: type of charger event
2010  * @msg: optional message passed to uevent_notify function
2011  */
2012 void cm_notify_event(struct power_supply *psy, enum cm_event_types type,
2013                      char *msg)
2014 {
2015         struct charger_manager *cm;
2016         bool found_power_supply = false;
2017 
2018         if (psy == NULL)
2019                 return;
2020 
2021         mutex_lock(&cm_list_mtx);
2022         list_for_each_entry(cm, &cm_list, entry) {
2023                 if (match_string(cm->desc->psy_charger_stat, -1,
2024                                  psy->desc->name) >= 0) {
2025                         found_power_supply = true;
2026                         break;
2027                 }
2028         }
2029         mutex_unlock(&cm_list_mtx);
2030 
2031         if (!found_power_supply)
2032                 return;
2033 
2034         switch (type) {
2035         case CM_EVENT_BATT_FULL:
2036                 fullbatt_handler(cm);
2037                 break;
2038         case CM_EVENT_BATT_OUT:
2039                 battout_handler(cm);
2040                 break;
2041         case CM_EVENT_BATT_IN:
2042         case CM_EVENT_EXT_PWR_IN_OUT ... CM_EVENT_CHG_START_STOP:
2043                 misc_event_handler(cm, type);
2044                 break;
2045         case CM_EVENT_UNKNOWN:
2046         case CM_EVENT_OTHERS:
2047                 uevent_notify(cm, msg ? msg : default_event_names[type]);
2048                 break;
2049         default:
2050                 dev_err(cm->dev, "%s: type not specified\n", __func__);
2051                 break;
2052         }
2053 }
2054 EXPORT_SYMBOL_GPL(cm_notify_event);
2055 
2056 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
2057 MODULE_DESCRIPTION("Charger Manager");
2058 MODULE_LICENSE("GPL");
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/power/supply/charger-manager.c

DEFINITIONS
