drivers/power/abx500_chargalg.c

   1 /*
   2  * Copyright (C) ST-Ericsson SA 2012
   3  *
   4  * Charging algorithm driver for abx500 variants
   5  *
   6  * License Terms: GNU General Public License v2
   7  * Authors:
   8  *      Johan Palsson <johan.palsson@stericsson.com>
   9  *      Karl Komierowski <karl.komierowski@stericsson.com>
  10  *      Arun R Murthy <arun.murthy@stericsson.com>
  11  */
  12
  13 #include <linux/init.h>
  14 #include <linux/module.h>
  15 #include <linux/device.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/delay.h>
  18 #include <linux/slab.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/power_supply.h>
  21 #include <linux/completion.h>
  22 #include <linux/workqueue.h>
  23 #include <linux/kobject.h>
  24 #include <linux/mfd/abx500.h>
  25 #include <linux/mfd/abx500/ux500_chargalg.h>
  26 #include <linux/mfd/abx500/ab8500-bm.h>
  27
  28 /* Watchdog kick interval */
  29 #define CHG_WD_INTERVAL                 (6 * HZ)
  30
  31 /* End-of-charge criteria counter */
  32 #define EOC_COND_CNT                    10
  33
  34 /* Recharge criteria counter */
  35 #define RCH_COND_CNT                    3
  36
  37 #define to_abx500_chargalg_device_info(x) container_of((x), \
  38         struct abx500_chargalg, chargalg_psy);
  39
  40 enum abx500_chargers {
  41         NO_CHG,
  42         AC_CHG,
  43         USB_CHG,
  44 };
  45
  46 struct abx500_chargalg_charger_info {
  47         enum abx500_chargers conn_chg;
  48         enum abx500_chargers prev_conn_chg;
  49         enum abx500_chargers online_chg;
  50         enum abx500_chargers prev_online_chg;
  51         enum abx500_chargers charger_type;
  52         bool usb_chg_ok;
  53         bool ac_chg_ok;
  54         int usb_volt;
  55         int usb_curr;
  56         int ac_volt;
  57         int ac_curr;
  58         int usb_vset;
  59         int usb_iset;
  60         int ac_vset;
  61         int ac_iset;
  62 };
  63
  64 struct abx500_chargalg_suspension_status {
  65         bool suspended_change;
  66         bool ac_suspended;
  67         bool usb_suspended;
  68 };
  69
  70 struct abx500_chargalg_battery_data {
  71         int temp;
  72         int volt;
  73         int avg_curr;
  74         int inst_curr;
  75         int percent;
  76 };
  77
  78 enum abx500_chargalg_states {
  79         STATE_HANDHELD_INIT,
  80         STATE_HANDHELD,
  81         STATE_CHG_NOT_OK_INIT,
  82         STATE_CHG_NOT_OK,
  83         STATE_HW_TEMP_PROTECT_INIT,
  84         STATE_HW_TEMP_PROTECT,
  85         STATE_NORMAL_INIT,
  86         STATE_NORMAL,
  87         STATE_WAIT_FOR_RECHARGE_INIT,
  88         STATE_WAIT_FOR_RECHARGE,
  89         STATE_MAINTENANCE_A_INIT,
  90         STATE_MAINTENANCE_A,
  91         STATE_MAINTENANCE_B_INIT,
  92         STATE_MAINTENANCE_B,
  93         STATE_TEMP_UNDEROVER_INIT,
  94         STATE_TEMP_UNDEROVER,
  95         STATE_TEMP_LOWHIGH_INIT,
  96         STATE_TEMP_LOWHIGH,
  97         STATE_SUSPENDED_INIT,
  98         STATE_SUSPENDED,
  99         STATE_OVV_PROTECT_INIT,
 100         STATE_OVV_PROTECT,
 101         STATE_SAFETY_TIMER_EXPIRED_INIT,
 102         STATE_SAFETY_TIMER_EXPIRED,
 103         STATE_BATT_REMOVED_INIT,
 104         STATE_BATT_REMOVED,
 105         STATE_WD_EXPIRED_INIT,
 106         STATE_WD_EXPIRED,
 107 };
 108
 109 static const char *states[] = {
 110         "HANDHELD_INIT",
 111         "HANDHELD",
 112         "CHG_NOT_OK_INIT",
 113         "CHG_NOT_OK",
 114         "HW_TEMP_PROTECT_INIT",
 115         "HW_TEMP_PROTECT",
 116         "NORMAL_INIT",
 117         "NORMAL",
 118         "WAIT_FOR_RECHARGE_INIT",
 119         "WAIT_FOR_RECHARGE",
 120         "MAINTENANCE_A_INIT",
 121         "MAINTENANCE_A",
 122         "MAINTENANCE_B_INIT",
 123         "MAINTENANCE_B",
 124         "TEMP_UNDEROVER_INIT",
 125         "TEMP_UNDEROVER",
 126         "TEMP_LOWHIGH_INIT",
 127         "TEMP_LOWHIGH",
 128         "SUSPENDED_INIT",
 129         "SUSPENDED",
 130         "OVV_PROTECT_INIT",
 131         "OVV_PROTECT",
 132         "SAFETY_TIMER_EXPIRED_INIT",
 133         "SAFETY_TIMER_EXPIRED",
 134         "BATT_REMOVED_INIT",
 135         "BATT_REMOVED",
 136         "WD_EXPIRED_INIT",
 137         "WD_EXPIRED",
 138 };
 139
 140 struct abx500_chargalg_events {
 141         bool batt_unknown;
 142         bool mainextchnotok;
 143         bool batt_ovv;
 144         bool batt_rem;
 145         bool btemp_underover;
 146         bool btemp_lowhigh;
 147         bool main_thermal_prot;
 148         bool usb_thermal_prot;
 149         bool main_ovv;
 150         bool vbus_ovv;
 151         bool usbchargernotok;
 152         bool safety_timer_expired;
 153         bool maintenance_timer_expired;
 154         bool ac_wd_expired;
 155         bool usb_wd_expired;
 156         bool ac_cv_active;
 157         bool usb_cv_active;
 158         bool vbus_collapsed;
 159 };
 160
 161 /**
 162  * struct abx500_charge_curr_maximization - Charger maximization parameters
 163  * @original_iset:      the non optimized/maximised charger current
 164  * @current_iset:       the charging current used at this moment
 165  * @test_delta_i:       the delta between the current we want to charge and the
 166                         current that is really going into the battery
 167  * @condition_cnt:      number of iterations needed before a new charger current
 168                         is set
 169  * @max_current:        maximum charger current
 170  * @wait_cnt:           to avoid too fast current step down in case of charger
 171  *                      voltage collapse, we insert this delay between step
 172  *                      down
 173  * @level:              tells in how many steps the charging current has been
 174                         increased
 175  */
 176 struct abx500_charge_curr_maximization {
 177         int original_iset;
 178         int current_iset;
 179         int test_delta_i;
 180         int condition_cnt;
 181         int max_current;
 182         int wait_cnt;
 183         u8 level;
 184 };
 185
 186 enum maxim_ret {
 187         MAXIM_RET_NOACTION,
 188         MAXIM_RET_CHANGE,
 189         MAXIM_RET_IBAT_TOO_HIGH,
 190 };
 191
 192 /**
 193  * struct abx500_chargalg - abx500 Charging algorithm device information
 194  * @dev:                pointer to the structure device
 195  * @charge_status:      battery operating status
 196  * @eoc_cnt:            counter used to determine end-of_charge
 197  * @rch_cnt:            counter used to determine start of recharge
 198  * @maintenance_chg:    indicate if maintenance charge is active
 199  * @t_hyst_norm         temperature hysteresis when the temperature has been
 200  *                      over or under normal limits
 201  * @t_hyst_lowhigh      temperature hysteresis when the temperature has been
 202  *                      over or under the high or low limits
 203  * @charge_state:       current state of the charging algorithm
 204  * @ccm                 charging current maximization parameters
 205  * @chg_info:           information about connected charger types
 206  * @batt_data:          data of the battery
 207  * @susp_status:        current charger suspension status
 208  * @pdata:              pointer to the abx500_chargalg platform data
 209  * @bat:                pointer to the abx500_bm platform data
 210  * @chargalg_psy:       structure that holds the battery properties exposed by
 211  *                      the charging algorithm
 212  * @events:             structure for information about events triggered
 213  * @chargalg_wq:                work queue for running the charging algorithm
 214  * @chargalg_periodic_work:     work to run the charging algorithm periodically
 215  * @chargalg_wd_work:           work to kick the charger watchdog periodically
 216  * @chargalg_work:              work to run the charging algorithm instantly
 217  * @safety_timer:               charging safety timer
 218  * @maintenance_timer:          maintenance charging timer
 219  * @chargalg_kobject:           structure of type kobject
 220  */
 221 struct abx500_chargalg {
 222         struct device *dev;
 223         int charge_status;
 224         int eoc_cnt;
 225         int rch_cnt;
 226         bool maintenance_chg;
 227         int t_hyst_norm;
 228         int t_hyst_lowhigh;
 229         enum abx500_chargalg_states charge_state;
 230         struct abx500_charge_curr_maximization ccm;
 231         struct abx500_chargalg_charger_info chg_info;
 232         struct abx500_chargalg_battery_data batt_data;
 233         struct abx500_chargalg_suspension_status susp_status;
 234         struct abx500_chargalg_platform_data *pdata;
 235         struct abx500_bm_data *bat;
 236         struct power_supply chargalg_psy;
 237         struct ux500_charger *ac_chg;
 238         struct ux500_charger *usb_chg;
 239         struct abx500_chargalg_events events;
 240         struct workqueue_struct *chargalg_wq;
 241         struct delayed_work chargalg_periodic_work;
 242         struct delayed_work chargalg_wd_work;
 243         struct work_struct chargalg_work;
 244         struct timer_list safety_timer;
 245         struct timer_list maintenance_timer;
 246         struct kobject chargalg_kobject;
 247 };
 248
 249 /* Main battery properties */
 250 static enum power_supply_property abx500_chargalg_props[] = {
 251         POWER_SUPPLY_PROP_STATUS,
 252         POWER_SUPPLY_PROP_HEALTH,
 253 };
 254
 255 /**
 256  * abx500_chargalg_safety_timer_expired() - Expiration of the safety timer
 257  * @data:       pointer to the abx500_chargalg structure
 258  *
 259  * This function gets called when the safety timer for the charger
 260  * expires
 261  */
 262 static void abx500_chargalg_safety_timer_expired(unsigned long data)
 263 {
 264         struct abx500_chargalg *di = (struct abx500_chargalg *) data;
 265         dev_err(di->dev, "Safety timer expired\n");
 266         di->events.safety_timer_expired = true;
 267
 268         /* Trigger execution of the algorithm instantly */
 269         queue_work(di->chargalg_wq, &di->chargalg_work);
 270 }
 271
 272 /**
 273  * abx500_chargalg_maintenance_timer_expired() - Expiration of
 274  * the maintenance timer
 275  * @i:          pointer to the abx500_chargalg structure
 276  *
 277  * This function gets called when the maintenence timer
 278  * expires
 279  */
 280 static void abx500_chargalg_maintenance_timer_expired(unsigned long data)
 281 {
 282
 283         struct abx500_chargalg *di = (struct abx500_chargalg *) data;
 284         dev_dbg(di->dev, "Maintenance timer expired\n");
 285         di->events.maintenance_timer_expired = true;
 286
 287         /* Trigger execution of the algorithm instantly */
 288         queue_work(di->chargalg_wq, &di->chargalg_work);
 289 }
 290
 291 /**
 292  * abx500_chargalg_state_to() - Change charge state
 293  * @di:         pointer to the abx500_chargalg structure
 294  *
 295  * This function gets called when a charge state change should occur
 296  */
 297 static void abx500_chargalg_state_to(struct abx500_chargalg *di,
 298         enum abx500_chargalg_states state)
 299 {
 300         dev_dbg(di->dev,
 301                 "State changed: %s (From state: [%d] %s =to=> [%d] %s )\n",
 302                 di->charge_state == state ? "NO" : "YES",
 303                 di->charge_state,
 304                 states[di->charge_state],
 305                 state,
 306                 states[state]);
 307
 308         di->charge_state = state;
 309 }
 310
 311 /**
 312  * abx500_chargalg_check_charger_connection() - Check charger connection change
 313  * @di:         pointer to the abx500_chargalg structure
 314  *
 315  * This function will check if there is a change in the charger connection
 316  * and change charge state accordingly. AC has precedence over USB.
 317  */
 318 static int abx500_chargalg_check_charger_connection(struct abx500_chargalg *di)
 319 {
 320         if (di->chg_info.conn_chg != di->chg_info.prev_conn_chg ||
 321                 di->susp_status.suspended_change) {
 322                 /*
 323                  * Charger state changed or suspension
 324                  * has changed since last update
 325                  */
 326                 if ((di->chg_info.conn_chg & AC_CHG) &&
 327                         !di->susp_status.ac_suspended) {
 328                         dev_dbg(di->dev, "Charging source is AC\n");
 329                         if (di->chg_info.charger_type != AC_CHG) {
 330                                 di->chg_info.charger_type = AC_CHG;
 331                                 abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
 332                         }
 333                 } else if ((di->chg_info.conn_chg & USB_CHG) &&
 334                         !di->susp_status.usb_suspended) {
 335                         dev_dbg(di->dev, "Charging source is USB\n");
 336                         di->chg_info.charger_type = USB_CHG;
 337                         abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
 338                 } else if (di->chg_info.conn_chg &&
 339                         (di->susp_status.ac_suspended ||
 340                         di->susp_status.usb_suspended)) {
 341                         dev_dbg(di->dev, "Charging is suspended\n");
 342                         di->chg_info.charger_type = NO_CHG;
 343                         abx500_chargalg_state_to(di, STATE_SUSPENDED_INIT);
 344                 } else {
 345                         dev_dbg(di->dev, "Charging source is OFF\n");
 346                         di->chg_info.charger_type = NO_CHG;
 347                         abx500_chargalg_state_to(di, STATE_HANDHELD_INIT);
 348                 }
 349                 di->chg_info.prev_conn_chg = di->chg_info.conn_chg;
 350                 di->susp_status.suspended_change = false;
 351         }
 352         return di->chg_info.conn_chg;
 353 }
 354
 355 /**
 356  * abx500_chargalg_start_safety_timer() - Start charging safety timer
 357  * @di:         pointer to the abx500_chargalg structure
 358  *
 359  * The safety timer is used to avoid overcharging of old or bad batteries.
 360  * There are different timers for AC and USB
 361  */
 362 static void abx500_chargalg_start_safety_timer(struct abx500_chargalg *di)
 363 {
 364         unsigned long timer_expiration = 0;
 365
 366         switch (di->chg_info.charger_type) {
 367         case AC_CHG:
 368                 timer_expiration =
 369                 round_jiffies(jiffies +
 370                         (di->bat->main_safety_tmr_h * 3600 * HZ));
 371                 break;
 372
 373         case USB_CHG:
 374                 timer_expiration =
 375                 round_jiffies(jiffies +
 376                         (di->bat->usb_safety_tmr_h * 3600 * HZ));
 377                 break;
 378
 379         default:
 380                 dev_err(di->dev, "Unknown charger to charge from\n");
 381                 break;
 382         }
 383
 384         di->events.safety_timer_expired = false;
 385         di->safety_timer.expires = timer_expiration;
 386         if (!timer_pending(&di->safety_timer))
 387                 add_timer(&di->safety_timer);
 388         else
 389                 mod_timer(&di->safety_timer, timer_expiration);
 390 }
 391
 392 /**
 393  * abx500_chargalg_stop_safety_timer() - Stop charging safety timer
 394  * @di:         pointer to the abx500_chargalg structure
 395  *
 396  * The safety timer is stopped whenever the NORMAL state is exited
 397  */
 398 static void abx500_chargalg_stop_safety_timer(struct abx500_chargalg *di)
 399 {
 400         di->events.safety_timer_expired = false;
 401         del_timer(&di->safety_timer);
 402 }
 403
 404 /**
 405  * abx500_chargalg_start_maintenance_timer() - Start charging maintenance timer
 406  * @di:         pointer to the abx500_chargalg structure
 407  * @duration:   duration of ther maintenance timer in hours
 408  *
 409  * The maintenance timer is used to maintain the charge in the battery once
 410  * the battery is considered full. These timers are chosen to match the
 411  * discharge curve of the battery
 412  */
 413 static void abx500_chargalg_start_maintenance_timer(struct abx500_chargalg *di,
 414         int duration)
 415 {
 416         unsigned long timer_expiration;
 417
 418         /* Convert from hours to jiffies */
 419         timer_expiration = round_jiffies(jiffies + (duration * 3600 * HZ));
 420
 421         di->events.maintenance_timer_expired = false;
 422         di->maintenance_timer.expires = timer_expiration;
 423         if (!timer_pending(&di->maintenance_timer))
 424                 add_timer(&di->maintenance_timer);
 425         else
 426                 mod_timer(&di->maintenance_timer, timer_expiration);
 427 }
 428
 429 /**
 430  * abx500_chargalg_stop_maintenance_timer() - Stop maintenance timer
 431  * @di:         pointer to the abx500_chargalg structure
 432  *
 433  * The maintenance timer is stopped whenever maintenance ends or when another
 434  * state is entered
 435  */
 436 static void abx500_chargalg_stop_maintenance_timer(struct abx500_chargalg *di)
 437 {
 438         di->events.maintenance_timer_expired = false;
 439         del_timer(&di->maintenance_timer);
 440 }
 441
 442 /**
 443  * abx500_chargalg_kick_watchdog() - Kick charger watchdog
 444  * @di:         pointer to the abx500_chargalg structure
 445  *
 446  * The charger watchdog have to be kicked periodically whenever the charger is
 447  * on, else the ABB will reset the system
 448  */
 449 static int abx500_chargalg_kick_watchdog(struct abx500_chargalg *di)
 450 {
 451         /* Check if charger exists and kick watchdog if charging */
 452         if (di->ac_chg && di->ac_chg->ops.kick_wd &&
 453                         di->chg_info.online_chg & AC_CHG)
 454                 return di->ac_chg->ops.kick_wd(di->ac_chg);
 455         else if (di->usb_chg && di->usb_chg->ops.kick_wd &&
 456                         di->chg_info.online_chg & USB_CHG)
 457                 return di->usb_chg->ops.kick_wd(di->usb_chg);
 458
 459         return -ENXIO;
 460 }
 461
 462 /**
 463  * abx500_chargalg_ac_en() - Turn on/off the AC charger
 464  * @di:         pointer to the abx500_chargalg structure
 465  * @enable:     charger on/off
 466  * @vset:       requested charger output voltage
 467  * @iset:       requested charger output current
 468  *
 469  * The AC charger will be turned on/off with the requested charge voltage and
 470  * current
 471  */
 472 static int abx500_chargalg_ac_en(struct abx500_chargalg *di, int enable,
 473         int vset, int iset)
 474 {
 475         if (!di->ac_chg || !di->ac_chg->ops.enable)
 476                 return -ENXIO;
 477
 478         /* Select maximum of what both the charger and the battery supports */
 479         if (di->ac_chg->max_out_volt)
 480                 vset = min(vset, di->ac_chg->max_out_volt);
 481         if (di->ac_chg->max_out_curr)
 482                 iset = min(iset, di->ac_chg->max_out_curr);
 483
 484         di->chg_info.ac_iset = iset;
 485         di->chg_info.ac_vset = vset;
 486
 487         return di->ac_chg->ops.enable(di->ac_chg, enable, vset, iset);
 488 }
 489
 490 /**
 491  * abx500_chargalg_usb_en() - Turn on/off the USB charger
 492  * @di:         pointer to the abx500_chargalg structure
 493  * @enable:     charger on/off
 494  * @vset:       requested charger output voltage
 495  * @iset:       requested charger output current
 496  *
 497  * The USB charger will be turned on/off with the requested charge voltage and
 498  * current
 499  */
 500 static int abx500_chargalg_usb_en(struct abx500_chargalg *di, int enable,
 501         int vset, int iset)
 502 {
 503         if (!di->usb_chg || !di->usb_chg->ops.enable)
 504                 return -ENXIO;
 505
 506         /* Select maximum of what both the charger and the battery supports */
 507         if (di->usb_chg->max_out_volt)
 508                 vset = min(vset, di->usb_chg->max_out_volt);
 509         if (di->usb_chg->max_out_curr)
 510                 iset = min(iset, di->usb_chg->max_out_curr);
 511
 512         di->chg_info.usb_iset = iset;
 513         di->chg_info.usb_vset = vset;
 514
 515         return di->usb_chg->ops.enable(di->usb_chg, enable, vset, iset);
 516 }
 517
 518 /**
 519  * abx500_chargalg_update_chg_curr() - Update charger current
 520  * @di:         pointer to the abx500_chargalg structure
 521  * @iset:       requested charger output current
 522  *
 523  * The charger output current will be updated for the charger
 524  * that is currently in use
 525  */
 526 static int abx500_chargalg_update_chg_curr(struct abx500_chargalg *di,
 527                 int iset)
 528 {
 529         /* Check if charger exists and update current if charging */
 530         if (di->ac_chg && di->ac_chg->ops.update_curr &&
 531                         di->chg_info.charger_type & AC_CHG) {
 532                 /*
 533                  * Select maximum of what both the charger
 534                  * and the battery supports
 535                  */
 536                 if (di->ac_chg->max_out_curr)
 537                         iset = min(iset, di->ac_chg->max_out_curr);
 538
 539                 di->chg_info.ac_iset = iset;
 540
 541                 return di->ac_chg->ops.update_curr(di->ac_chg, iset);
 542         } else if (di->usb_chg && di->usb_chg->ops.update_curr &&
 543                         di->chg_info.charger_type & USB_CHG) {
 544                 /*
 545                  * Select maximum of what both the charger
 546                  * and the battery supports
 547                  */
 548                 if (di->usb_chg->max_out_curr)
 549                         iset = min(iset, di->usb_chg->max_out_curr);
 550
 551                 di->chg_info.usb_iset = iset;
 552
 553                 return di->usb_chg->ops.update_curr(di->usb_chg, iset);
 554         }
 555
 556         return -ENXIO;
 557 }
 558
 559 /**
 560  * abx500_chargalg_stop_charging() - Stop charging
 561  * @di:         pointer to the abx500_chargalg structure
 562  *
 563  * This function is called from any state where charging should be stopped.
 564  * All charging is disabled and all status parameters and timers are changed
 565  * accordingly
 566  */
 567 static void abx500_chargalg_stop_charging(struct abx500_chargalg *di)
 568 {
 569         abx500_chargalg_ac_en(di, false, 0, 0);
 570         abx500_chargalg_usb_en(di, false, 0, 0);
 571         abx500_chargalg_stop_safety_timer(di);
 572         abx500_chargalg_stop_maintenance_timer(di);
 573         di->charge_status = POWER_SUPPLY_STATUS_NOT_CHARGING;
 574         di->maintenance_chg = false;
 575         cancel_delayed_work(&di->chargalg_wd_work);
 576         power_supply_changed(&di->chargalg_psy);
 577 }
 578
 579 /**
 580  * abx500_chargalg_hold_charging() - Pauses charging
 581  * @di:         pointer to the abx500_chargalg structure
 582  *
 583  * This function is called in the case where maintenance charging has been
 584  * disabled and instead a battery voltage mode is entered to check when the
 585  * battery voltage has reached a certain recharge voltage
 586  */
 587 static void abx500_chargalg_hold_charging(struct abx500_chargalg *di)
 588 {
 589         abx500_chargalg_ac_en(di, false, 0, 0);
 590         abx500_chargalg_usb_en(di, false, 0, 0);
 591         abx500_chargalg_stop_safety_timer(di);
 592         abx500_chargalg_stop_maintenance_timer(di);
 593         di->charge_status = POWER_SUPPLY_STATUS_CHARGING;
 594         di->maintenance_chg = false;
 595         cancel_delayed_work(&di->chargalg_wd_work);
 596         power_supply_changed(&di->chargalg_psy);
 597 }
 598
 599 /**
 600  * abx500_chargalg_start_charging() - Start the charger
 601  * @di:         pointer to the abx500_chargalg structure
 602  * @vset:       requested charger output voltage
 603  * @iset:       requested charger output current
 604  *
 605  * A charger will be enabled depending on the requested charger type that was
 606  * detected previously.
 607  */
 608 static void abx500_chargalg_start_charging(struct abx500_chargalg *di,
 609         int vset, int iset)
 610 {
 611         switch (di->chg_info.charger_type) {
 612         case AC_CHG:
 613                 dev_dbg(di->dev,
 614                         "AC parameters: Vset %d, Ich %d\n", vset, iset);
 615                 abx500_chargalg_usb_en(di, false, 0, 0);
 616                 abx500_chargalg_ac_en(di, true, vset, iset);
 617                 break;
 618
 619         case USB_CHG:
 620                 dev_dbg(di->dev,
 621                         "USB parameters: Vset %d, Ich %d\n", vset, iset);
 622                 abx500_chargalg_ac_en(di, false, 0, 0);
 623                 abx500_chargalg_usb_en(di, true, vset, iset);
 624                 break;
 625
 626         default:
 627                 dev_err(di->dev, "Unknown charger to charge from\n");
 628                 break;
 629         }
 630 }
 631
 632 /**
 633  * abx500_chargalg_check_temp() - Check battery temperature ranges
 634  * @di:         pointer to the abx500_chargalg structure
 635  *
 636  * The battery temperature is checked against the predefined limits and the
 637  * charge state is changed accordingly
 638  */
 639 static void abx500_chargalg_check_temp(struct abx500_chargalg *di)
 640 {
 641         if (di->batt_data.temp > (di->bat->temp_low + di->t_hyst_norm) &&
 642                 di->batt_data.temp < (di->bat->temp_high - di->t_hyst_norm)) {
 643                 /* Temp OK! */
 644                 di->events.btemp_underover = false;
 645                 di->events.btemp_lowhigh = false;
 646                 di->t_hyst_norm = 0;
 647                 di->t_hyst_lowhigh = 0;
 648         } else {
 649                 if (((di->batt_data.temp >= di->bat->temp_high) &&
 650                         (di->batt_data.temp <
 651                                 (di->bat->temp_over - di->t_hyst_lowhigh))) ||
 652                         ((di->batt_data.temp >
 653                                 (di->bat->temp_under + di->t_hyst_lowhigh)) &&
 654                         (di->batt_data.temp <= di->bat->temp_low))) {
 655                         /* TEMP minor!!!!! */
 656                         di->events.btemp_underover = false;
 657                         di->events.btemp_lowhigh = true;
 658                         di->t_hyst_norm = di->bat->temp_hysteresis;
 659                         di->t_hyst_lowhigh = 0;
 660                 } else if (di->batt_data.temp <= di->bat->temp_under ||
 661                         di->batt_data.temp >= di->bat->temp_over) {
 662                         /* TEMP major!!!!! */
 663                         di->events.btemp_underover = true;
 664                         di->events.btemp_lowhigh = false;
 665                         di->t_hyst_norm = 0;
 666                         di->t_hyst_lowhigh = di->bat->temp_hysteresis;
 667                 } else {
 668                 /* Within hysteresis */
 669                 dev_dbg(di->dev, "Within hysteresis limit temp: %d "
 670                                 "hyst_lowhigh %d, hyst normal %d\n",
 671                                 di->batt_data.temp, di->t_hyst_lowhigh,
 672                                 di->t_hyst_norm);
 673                 }
 674         }
 675 }
 676
 677 /**
 678  * abx500_chargalg_check_charger_voltage() - Check charger voltage
 679  * @di:         pointer to the abx500_chargalg structure
 680  *
 681  * Charger voltage is checked against maximum limit
 682  */
 683 static void abx500_chargalg_check_charger_voltage(struct abx500_chargalg *di)
 684 {
 685         if (di->chg_info.usb_volt > di->bat->chg_params->usb_volt_max)
 686                 di->chg_info.usb_chg_ok = false;
 687         else
 688                 di->chg_info.usb_chg_ok = true;
 689
 690         if (di->chg_info.ac_volt > di->bat->chg_params->ac_volt_max)
 691                 di->chg_info.ac_chg_ok = false;
 692         else
 693                 di->chg_info.ac_chg_ok = true;
 694
 695 }
 696
 697 /**
 698  * abx500_chargalg_end_of_charge() - Check if end-of-charge criteria is fulfilled
 699  * @di:         pointer to the abx500_chargalg structure
 700  *
 701  * End-of-charge criteria is fulfilled when the battery voltage is above a
 702  * certain limit and the battery current is below a certain limit for a
 703  * predefined number of consecutive seconds. If true, the battery is full
 704  */
 705 static void abx500_chargalg_end_of_charge(struct abx500_chargalg *di)
 706 {
 707         if (di->charge_status == POWER_SUPPLY_STATUS_CHARGING &&
 708                 di->charge_state == STATE_NORMAL &&
 709                 !di->maintenance_chg && (di->batt_data.volt >=
 710                 di->bat->bat_type[di->bat->batt_id].termination_vol ||
 711                 di->events.usb_cv_active || di->events.ac_cv_active) &&
 712                 di->batt_data.avg_curr <
 713                 di->bat->bat_type[di->bat->batt_id].termination_curr &&
 714                 di->batt_data.avg_curr > 0) {
 715                 if (++di->eoc_cnt >= EOC_COND_CNT) {
 716                         di->eoc_cnt = 0;
 717                         di->charge_status = POWER_SUPPLY_STATUS_FULL;
 718                         di->maintenance_chg = true;
 719                         dev_dbg(di->dev, "EOC reached!\n");
 720                         power_supply_changed(&di->chargalg_psy);
 721                 } else {
 722                         dev_dbg(di->dev,
 723                                 " EOC limit reached for the %d"
 724                                 " time, out of %d before EOC\n",
 725                                 di->eoc_cnt,
 726                                 EOC_COND_CNT);
 727                 }
 728         } else {
 729                 di->eoc_cnt = 0;
 730         }
 731 }
 732
 733 static void init_maxim_chg_curr(struct abx500_chargalg *di)
 734 {
 735         di->ccm.original_iset =
 736                 di->bat->bat_type[di->bat->batt_id].normal_cur_lvl;
 737         di->ccm.current_iset =
 738                 di->bat->bat_type[di->bat->batt_id].normal_cur_lvl;
 739         di->ccm.test_delta_i = di->bat->maxi->charger_curr_step;
 740         di->ccm.max_current = di->bat->maxi->chg_curr;
 741         di->ccm.condition_cnt = di->bat->maxi->wait_cycles;
 742         di->ccm.level = 0;
 743 }
 744
 745 /**
 746  * abx500_chargalg_chg_curr_maxim - increases the charger current to
 747  *                      compensate for the system load
 748  * @di          pointer to the abx500_chargalg structure
 749  *
 750  * This maximization function is used to raise the charger current to get the
 751  * battery current as close to the optimal value as possible. The battery
 752  * current during charging is affected by the system load
 753  */
 754 static enum maxim_ret abx500_chargalg_chg_curr_maxim(struct abx500_chargalg *di)
 755 {
 756         int delta_i;
 757
 758         if (!di->bat->maxi->ena_maxi)
 759                 return MAXIM_RET_NOACTION;
 760
 761         delta_i = di->ccm.original_iset - di->batt_data.inst_curr;
 762
 763         if (di->events.vbus_collapsed) {
 764                 dev_dbg(di->dev, "Charger voltage has collapsed %d\n",
 765                                 di->ccm.wait_cnt);
 766                 if (di->ccm.wait_cnt == 0) {
 767                         dev_dbg(di->dev, "lowering current\n");
 768                         di->ccm.wait_cnt++;
 769                         di->ccm.condition_cnt = di->bat->maxi->wait_cycles;
 770                         di->ccm.max_current =
 771                                 di->ccm.current_iset - di->ccm.test_delta_i;
 772                         di->ccm.current_iset = di->ccm.max_current;
 773                         di->ccm.level--;
 774                         return MAXIM_RET_CHANGE;
 775                 } else {
 776                         dev_dbg(di->dev, "waiting\n");
 777                         /* Let's go in here twice before lowering curr again */
 778                         di->ccm.wait_cnt = (di->ccm.wait_cnt + 1) % 3;
 779                         return MAXIM_RET_NOACTION;
 780                 }
 781         }
 782
 783         di->ccm.wait_cnt = 0;
 784
 785         if ((di->batt_data.inst_curr > di->ccm.original_iset)) {
 786                 dev_dbg(di->dev, " Maximization Ibat (%dmA) too high"
 787                         " (limit %dmA) (current iset: %dmA)!\n",
 788                         di->batt_data.inst_curr, di->ccm.original_iset,
 789                         di->ccm.current_iset);
 790
 791                 if (di->ccm.current_iset == di->ccm.original_iset)
 792                         return MAXIM_RET_NOACTION;
 793
 794                 di->ccm.condition_cnt = di->bat->maxi->wait_cycles;
 795                 di->ccm.current_iset = di->ccm.original_iset;
 796                 di->ccm.level = 0;
 797
 798                 return MAXIM_RET_IBAT_TOO_HIGH;
 799         }
 800
 801         if (delta_i > di->ccm.test_delta_i &&
 802                 (di->ccm.current_iset + di->ccm.test_delta_i) <
 803                 di->ccm.max_current) {
 804                 if (di->ccm.condition_cnt-- == 0) {
 805                         /* Increse the iset with cco.test_delta_i */
 806                         di->ccm.condition_cnt = di->bat->maxi->wait_cycles;
 807                         di->ccm.current_iset += di->ccm.test_delta_i;
 808                         di->ccm.level++;
 809                         dev_dbg(di->dev, " Maximization needed, increase"
 810                                 " with %d mA to %dmA (Optimal ibat: %d)"
 811                                 " Level %d\n",
 812                                 di->ccm.test_delta_i,
 813                                 di->ccm.current_iset,
 814                                 di->ccm.original_iset,
 815                                 di->ccm.level);
 816                         return MAXIM_RET_CHANGE;
 817                 } else {
 818                         return MAXIM_RET_NOACTION;
 819                 }
 820         }  else {
 821                 di->ccm.condition_cnt = di->bat->maxi->wait_cycles;
 822                 return MAXIM_RET_NOACTION;
 823         }
 824 }
 825
 826 static void handle_maxim_chg_curr(struct abx500_chargalg *di)
 827 {
 828         enum maxim_ret ret;
 829         int result;
 830
 831         ret = abx500_chargalg_chg_curr_maxim(di);
 832         switch (ret) {
 833         case MAXIM_RET_CHANGE:
 834                 result = abx500_chargalg_update_chg_curr(di,
 835                         di->ccm.current_iset);
 836                 if (result)
 837                         dev_err(di->dev, "failed to set chg curr\n");
 838                 break;
 839         case MAXIM_RET_IBAT_TOO_HIGH:
 840                 result = abx500_chargalg_update_chg_curr(di,
 841                         di->bat->bat_type[di->bat->batt_id].normal_cur_lvl);
 842                 if (result)
 843                         dev_err(di->dev, "failed to set chg curr\n");
 844                 break;
 845
 846         case MAXIM_RET_NOACTION:
 847         default:
 848                 /* Do nothing..*/
 849                 break;
 850         }
 851 }
 852
 853 static int abx500_chargalg_get_ext_psy_data(struct device *dev, void *data)
 854 {
 855         struct power_supply *psy;
 856         struct power_supply *ext;
 857         struct abx500_chargalg *di;
 858         union power_supply_propval ret;
 859         int i, j;
 860         bool psy_found = false;
 861
 862         psy = (struct power_supply *)data;
 863         ext = dev_get_drvdata(dev);
 864         di = to_abx500_chargalg_device_info(psy);
 865         /* For all psy where the driver name appears in any supplied_to */
 866         for (i = 0; i < ext->num_supplicants; i++) {
 867                 if (!strcmp(ext->supplied_to[i], psy->name))
 868                         psy_found = true;
 869         }
 870         if (!psy_found)
 871                 return 0;
 872
 873         /* Go through all properties for the psy */
 874         for (j = 0; j < ext->num_properties; j++) {
 875                 enum power_supply_property prop;
 876                 prop = ext->properties[j];
 877
 878                 /* Initialize chargers if not already done */
 879                 if (!di->ac_chg &&
 880                         ext->type == POWER_SUPPLY_TYPE_MAINS)
 881                         di->ac_chg = psy_to_ux500_charger(ext);
 882                 else if (!di->usb_chg &&
 883                         ext->type == POWER_SUPPLY_TYPE_USB)
 884                         di->usb_chg = psy_to_ux500_charger(ext);
 885
 886                 if (ext->get_property(ext, prop, &ret))
 887                         continue;
 888                 switch (prop) {
 889                 case POWER_SUPPLY_PROP_PRESENT:
 890                         switch (ext->type) {
 891                         case POWER_SUPPLY_TYPE_BATTERY:
 892                                 /* Battery present */
 893                                 if (ret.intval)
 894                                         di->events.batt_rem = false;
 895                                 /* Battery removed */
 896                                 else
 897                                         di->events.batt_rem = true;
 898                                 break;
 899                         case POWER_SUPPLY_TYPE_MAINS:
 900                                 /* AC disconnected */
 901                                 if (!ret.intval &&
 902                                         (di->chg_info.conn_chg & AC_CHG)) {
 903                                         di->chg_info.prev_conn_chg =
 904                                                 di->chg_info.conn_chg;
 905                                         di->chg_info.conn_chg &= ~AC_CHG;
 906                                 }
 907                                 /* AC connected */
 908                                 else if (ret.intval &&
 909                                         !(di->chg_info.conn_chg & AC_CHG)) {
 910                                         di->chg_info.prev_conn_chg =
 911                                                 di->chg_info.conn_chg;
 912                                         di->chg_info.conn_chg |= AC_CHG;
 913                                 }
 914                                 break;
 915                         case POWER_SUPPLY_TYPE_USB:
 916                                 /* USB disconnected */
 917                                 if (!ret.intval &&
 918                                         (di->chg_info.conn_chg & USB_CHG)) {
 919                                         di->chg_info.prev_conn_chg =
 920                                                 di->chg_info.conn_chg;
 921                                         di->chg_info.conn_chg &= ~USB_CHG;
 922                                 }
 923                                 /* USB connected */
 924                                 else if (ret.intval &&
 925                                         !(di->chg_info.conn_chg & USB_CHG)) {
 926                                         di->chg_info.prev_conn_chg =
 927                                                 di->chg_info.conn_chg;
 928                                         di->chg_info.conn_chg |= USB_CHG;
 929                                 }
 930                                 break;
 931                         default:
 932                                 break;
 933                         }
 934                         break;
 935
 936                 case POWER_SUPPLY_PROP_ONLINE:
 937                         switch (ext->type) {
 938                         case POWER_SUPPLY_TYPE_BATTERY:
 939                                 break;
 940                         case POWER_SUPPLY_TYPE_MAINS:
 941                                 /* AC offline */
 942                                 if (!ret.intval &&
 943                                         (di->chg_info.online_chg & AC_CHG)) {
 944                                         di->chg_info.prev_online_chg =
 945                                                 di->chg_info.online_chg;
 946                                         di->chg_info.online_chg &= ~AC_CHG;
 947                                 }
 948                                 /* AC online */
 949                                 else if (ret.intval &&
 950                                         !(di->chg_info.online_chg & AC_CHG)) {
 951                                         di->chg_info.prev_online_chg =
 952                                                 di->chg_info.online_chg;
 953                                         di->chg_info.online_chg |= AC_CHG;
 954                                         queue_delayed_work(di->chargalg_wq,
 955                                                 &di->chargalg_wd_work, 0);
 956                                 }
 957                                 break;
 958                         case POWER_SUPPLY_TYPE_USB:
 959                                 /* USB offline */
 960                                 if (!ret.intval &&
 961                                         (di->chg_info.online_chg & USB_CHG)) {
 962                                         di->chg_info.prev_online_chg =
 963                                                 di->chg_info.online_chg;
 964                                         di->chg_info.online_chg &= ~USB_CHG;
 965                                 }
 966                                 /* USB online */
 967                                 else if (ret.intval &&
 968                                         !(di->chg_info.online_chg & USB_CHG)) {
 969                                         di->chg_info.prev_online_chg =
 970                                                 di->chg_info.online_chg;
 971                                         di->chg_info.online_chg |= USB_CHG;
 972                                         queue_delayed_work(di->chargalg_wq,
 973                                                 &di->chargalg_wd_work, 0);
 974                                 }
 975                                 break;
 976                         default:
 977                                 break;
 978                         }
 979                         break;
 980
 981                 case POWER_SUPPLY_PROP_HEALTH:
 982                         switch (ext->type) {
 983                         case POWER_SUPPLY_TYPE_BATTERY:
 984                                 break;
 985                         case POWER_SUPPLY_TYPE_MAINS:
 986                                 switch (ret.intval) {
 987                                 case POWER_SUPPLY_HEALTH_UNSPEC_FAILURE:
 988                                         di->events.mainextchnotok = true;
 989                                         di->events.main_thermal_prot = false;
 990                                         di->events.main_ovv = false;
 991                                         di->events.ac_wd_expired = false;
 992                                         break;
 993                                 case POWER_SUPPLY_HEALTH_DEAD:
 994                                         di->events.ac_wd_expired = true;
 995                                         di->events.mainextchnotok = false;
 996                                         di->events.main_ovv = false;
 997                                         di->events.main_thermal_prot = false;
 998                                         break;
 999                                 case POWER_SUPPLY_HEALTH_COLD:
1000                                 case POWER_SUPPLY_HEALTH_OVERHEAT:
1001                                         di->events.main_thermal_prot = true;
1002                                         di->events.mainextchnotok = false;
1003                                         di->events.main_ovv = false;
1004                                         di->events.ac_wd_expired = false;
1005                                         break;
1006                                 case POWER_SUPPLY_HEALTH_OVERVOLTAGE:
1007                                         di->events.main_ovv = true;
1008                                         di->events.mainextchnotok = false;
1009                                         di->events.main_thermal_prot = false;
1010                                         di->events.ac_wd_expired = false;
1011                                         break;
1012                                 case POWER_SUPPLY_HEALTH_GOOD:
1013                                         di->events.main_thermal_prot = false;
1014                                         di->events.mainextchnotok = false;
1015                                         di->events.main_ovv = false;
1016                                         di->events.ac_wd_expired = false;
1017                                         break;
1018                                 default:
1019                                         break;
1020                                 }
1021                                 break;
1022
1023                         case POWER_SUPPLY_TYPE_USB:
1024                                 switch (ret.intval) {
1025                                 case POWER_SUPPLY_HEALTH_UNSPEC_FAILURE:
1026                                         di->events.usbchargernotok = true;
1027                                         di->events.usb_thermal_prot = false;
1028                                         di->events.vbus_ovv = false;
1029                                         di->events.usb_wd_expired = false;
1030                                         break;
1031                                 case POWER_SUPPLY_HEALTH_DEAD:
1032                                         di->events.usb_wd_expired = true;
1033                                         di->events.usbchargernotok = false;
1034                                         di->events.usb_thermal_prot = false;
1035                                         di->events.vbus_ovv = false;
1036                                         break;
1037                                 case POWER_SUPPLY_HEALTH_COLD:
1038                                 case POWER_SUPPLY_HEALTH_OVERHEAT:
1039                                         di->events.usb_thermal_prot = true;
1040                                         di->events.usbchargernotok = false;
1041                                         di->events.vbus_ovv = false;
1042                                         di->events.usb_wd_expired = false;
1043                                         break;
1044                                 case POWER_SUPPLY_HEALTH_OVERVOLTAGE:
1045                                         di->events.vbus_ovv = true;
1046                                         di->events.usbchargernotok = false;
1047                                         di->events.usb_thermal_prot = false;
1048                                         di->events.usb_wd_expired = false;
1049                                         break;
1050                                 case POWER_SUPPLY_HEALTH_GOOD:
1051                                         di->events.usbchargernotok = false;
1052                                         di->events.usb_thermal_prot = false;
1053                                         di->events.vbus_ovv = false;
1054                                         di->events.usb_wd_expired = false;
1055                                         break;
1056                                 default:
1057                                         break;
1058                                 }
1059                         default:
1060                                 break;
1061                         }
1062                         break;
1063
1064                 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
1065                         switch (ext->type) {
1066                         case POWER_SUPPLY_TYPE_BATTERY:
1067                                 di->batt_data.volt = ret.intval / 1000;
1068                                 break;
1069                         case POWER_SUPPLY_TYPE_MAINS:
1070                                 di->chg_info.ac_volt = ret.intval / 1000;
1071                                 break;
1072                         case POWER_SUPPLY_TYPE_USB:
1073                                 di->chg_info.usb_volt = ret.intval / 1000;
1074                                 break;
1075                         default:
1076                                 break;
1077                         }
1078                         break;
1079
1080                 case POWER_SUPPLY_PROP_VOLTAGE_AVG:
1081                         switch (ext->type) {
1082                         case POWER_SUPPLY_TYPE_MAINS:
1083                                 /* AVG is used to indicate when we are
1084                                  * in CV mode */
1085                                 if (ret.intval)
1086                                         di->events.ac_cv_active = true;
1087                                 else
1088                                         di->events.ac_cv_active = false;
1089
1090                                 break;
1091                         case POWER_SUPPLY_TYPE_USB:
1092                                 /* AVG is used to indicate when we are
1093                                  * in CV mode */
1094                                 if (ret.intval)
1095                                         di->events.usb_cv_active = true;
1096                                 else
1097                                         di->events.usb_cv_active = false;
1098
1099                                 break;
1100                         default:
1101                                 break;
1102                         }
1103                         break;
1104
1105                 case POWER_SUPPLY_PROP_TECHNOLOGY:
1106                         switch (ext->type) {
1107                         case POWER_SUPPLY_TYPE_BATTERY:
1108                                 if (ret.intval)
1109                                         di->events.batt_unknown = false;
1110                                 else
1111                                         di->events.batt_unknown = true;
1112
1113                                 break;
1114                         default:
1115                                 break;
1116                         }
1117                         break;
1118
1119                 case POWER_SUPPLY_PROP_TEMP:
1120                         di->batt_data.temp = ret.intval / 10;
1121                         break;
1122
1123                 case POWER_SUPPLY_PROP_CURRENT_NOW:
1124                         switch (ext->type) {
1125                         case POWER_SUPPLY_TYPE_MAINS:
1126                                         di->chg_info.ac_curr =
1127                                                 ret.intval / 1000;
1128                                         break;
1129                         case POWER_SUPPLY_TYPE_USB:
1130                                         di->chg_info.usb_curr =
1131                                                 ret.intval / 1000;
1132                                 break;
1133                         case POWER_SUPPLY_TYPE_BATTERY:
1134                                 di->batt_data.inst_curr = ret.intval / 1000;
1135                                 break;
1136                         default:
1137                                 break;
1138                         }
1139                         break;
1140
1141                 case POWER_SUPPLY_PROP_CURRENT_AVG:
1142                         switch (ext->type) {
1143                         case POWER_SUPPLY_TYPE_BATTERY:
1144                                 di->batt_data.avg_curr = ret.intval / 1000;
1145                                 break;
1146                         case POWER_SUPPLY_TYPE_USB:
1147                                 if (ret.intval)
1148                                         di->events.vbus_collapsed = true;
1149                                 else
1150                                         di->events.vbus_collapsed = false;
1151                                 break;
1152                         default:
1153                                 break;
1154                         }
1155                         break;
1156                 case POWER_SUPPLY_PROP_CAPACITY:
1157                         di->batt_data.percent = ret.intval;
1158                         break;
1159                 default:
1160                         break;
1161                 }
1162         }
1163         return 0;
1164 }
1165
1166 /**
1167  * abx500_chargalg_external_power_changed() - callback for power supply changes
1168  * @psy:       pointer to the structure power_supply
1169  *
1170  * This function is the entry point of the pointer external_power_changed
1171  * of the structure power_supply.
1172  * This function gets executed when there is a change in any external power
1173  * supply that this driver needs to be notified of.
1174  */
1175 static void abx500_chargalg_external_power_changed(struct power_supply *psy)
1176 {
1177         struct abx500_chargalg *di = to_abx500_chargalg_device_info(psy);
1178
1179         /*
1180          * Trigger execution of the algorithm instantly and read
1181          * all power_supply properties there instead
1182          */
1183         queue_work(di->chargalg_wq, &di->chargalg_work);
1184 }
1185
1186 /**
1187  * abx500_chargalg_algorithm() - Main function for the algorithm
1188  * @di:         pointer to the abx500_chargalg structure
1189  *
1190  * This is the main control function for the charging algorithm.
1191  * It is called periodically or when something happens that will
1192  * trigger a state change
1193  */
1194 static void abx500_chargalg_algorithm(struct abx500_chargalg *di)
1195 {
1196         int charger_status;
1197
1198         /* Collect data from all power_supply class devices */
1199         class_for_each_device(power_supply_class, NULL,
1200                 &di->chargalg_psy, abx500_chargalg_get_ext_psy_data);
1201
1202         abx500_chargalg_end_of_charge(di);
1203         abx500_chargalg_check_temp(di);
1204         abx500_chargalg_check_charger_voltage(di);
1205
1206         charger_status = abx500_chargalg_check_charger_connection(di);
1207         /*
1208          * First check if we have a charger connected.
1209          * Also we don't allow charging of unknown batteries if configured
1210          * this way
1211          */
1212         if (!charger_status ||
1213                 (di->events.batt_unknown && !di->bat->chg_unknown_bat)) {
1214                 if (di->charge_state != STATE_HANDHELD) {
1215                         di->events.safety_timer_expired = false;
1216                         abx500_chargalg_state_to(di, STATE_HANDHELD_INIT);
1217                 }
1218         }
1219
1220         /* If suspended, we should not continue checking the flags */
1221         else if (di->charge_state == STATE_SUSPENDED_INIT ||
1222                 di->charge_state == STATE_SUSPENDED) {
1223                 /* We don't do anything here, just don,t continue */
1224         }
1225
1226         /* Safety timer expiration */
1227         else if (di->events.safety_timer_expired) {
1228                 if (di->charge_state != STATE_SAFETY_TIMER_EXPIRED)
1229                         abx500_chargalg_state_to(di,
1230                                 STATE_SAFETY_TIMER_EXPIRED_INIT);
1231         }
1232         /*
1233          * Check if any interrupts has occured
1234          * that will prevent us from charging
1235          */
1236
1237         /* Battery removed */
1238         else if (di->events.batt_rem) {
1239                 if (di->charge_state != STATE_BATT_REMOVED)
1240                         abx500_chargalg_state_to(di, STATE_BATT_REMOVED_INIT);
1241         }
1242         /* Main or USB charger not ok. */
1243         else if (di->events.mainextchnotok || di->events.usbchargernotok) {
1244                 /*
1245                  * If vbus_collapsed is set, we have to lower the charger
1246                  * current, which is done in the normal state below
1247                  */
1248                 if (di->charge_state != STATE_CHG_NOT_OK &&
1249                                 !di->events.vbus_collapsed)
1250                         abx500_chargalg_state_to(di, STATE_CHG_NOT_OK_INIT);
1251         }
1252         /* VBUS, Main or VBAT OVV. */
1253         else if (di->events.vbus_ovv ||
1254                         di->events.main_ovv ||
1255                         di->events.batt_ovv ||
1256                         !di->chg_info.usb_chg_ok ||
1257                         !di->chg_info.ac_chg_ok) {
1258                 if (di->charge_state != STATE_OVV_PROTECT)
1259                         abx500_chargalg_state_to(di, STATE_OVV_PROTECT_INIT);
1260         }
1261         /* USB Thermal, stop charging */
1262         else if (di->events.main_thermal_prot ||
1263                 di->events.usb_thermal_prot) {
1264                 if (di->charge_state != STATE_HW_TEMP_PROTECT)
1265                         abx500_chargalg_state_to(di,
1266                                 STATE_HW_TEMP_PROTECT_INIT);
1267         }
1268         /* Battery temp over/under */
1269         else if (di->events.btemp_underover) {
1270                 if (di->charge_state != STATE_TEMP_UNDEROVER)
1271                         abx500_chargalg_state_to(di,
1272                                 STATE_TEMP_UNDEROVER_INIT);
1273         }
1274         /* Watchdog expired */
1275         else if (di->events.ac_wd_expired ||
1276                 di->events.usb_wd_expired) {
1277                 if (di->charge_state != STATE_WD_EXPIRED)
1278                         abx500_chargalg_state_to(di, STATE_WD_EXPIRED_INIT);
1279         }
1280         /* Battery temp high/low */
1281         else if (di->events.btemp_lowhigh) {
1282                 if (di->charge_state != STATE_TEMP_LOWHIGH)
1283                         abx500_chargalg_state_to(di, STATE_TEMP_LOWHIGH_INIT);
1284         }
1285
1286         dev_dbg(di->dev,
1287                 "[CHARGALG] Vb %d Ib_avg %d Ib_inst %d Tb %d Cap %d Maint %d "
1288                 "State %s Active_chg %d Chg_status %d AC %d USB %d "
1289                 "AC_online %d USB_online %d AC_CV %d USB_CV %d AC_I %d "
1290                 "USB_I %d AC_Vset %d AC_Iset %d USB_Vset %d USB_Iset %d\n",
1291                 di->batt_data.volt,
1292                 di->batt_data.avg_curr,
1293                 di->batt_data.inst_curr,
1294                 di->batt_data.temp,
1295                 di->batt_data.percent,
1296                 di->maintenance_chg,
1297                 states[di->charge_state],
1298                 di->chg_info.charger_type,
1299                 di->charge_status,
1300                 di->chg_info.conn_chg & AC_CHG,
1301                 di->chg_info.conn_chg & USB_CHG,
1302                 di->chg_info.online_chg & AC_CHG,
1303                 di->chg_info.online_chg & USB_CHG,
1304                 di->events.ac_cv_active,
1305                 di->events.usb_cv_active,
1306                 di->chg_info.ac_curr,
1307                 di->chg_info.usb_curr,
1308                 di->chg_info.ac_vset,
1309                 di->chg_info.ac_iset,
1310                 di->chg_info.usb_vset,
1311                 di->chg_info.usb_iset);
1312
1313         switch (di->charge_state) {
1314         case STATE_HANDHELD_INIT:
1315                 abx500_chargalg_stop_charging(di);
1316                 di->charge_status = POWER_SUPPLY_STATUS_DISCHARGING;
1317                 abx500_chargalg_state_to(di, STATE_HANDHELD);
1318                 /* Intentional fallthrough */
1319
1320         case STATE_HANDHELD:
1321                 break;
1322
1323         case STATE_SUSPENDED_INIT:
1324                 if (di->susp_status.ac_suspended)
1325                         abx500_chargalg_ac_en(di, false, 0, 0);
1326                 if (di->susp_status.usb_suspended)
1327                         abx500_chargalg_usb_en(di, false, 0, 0);
1328                 abx500_chargalg_stop_safety_timer(di);
1329                 abx500_chargalg_stop_maintenance_timer(di);
1330                 di->charge_status = POWER_SUPPLY_STATUS_NOT_CHARGING;
1331                 di->maintenance_chg = false;
1332                 abx500_chargalg_state_to(di, STATE_SUSPENDED);
1333                 power_supply_changed(&di->chargalg_psy);
1334                 /* Intentional fallthrough */
1335
1336         case STATE_SUSPENDED:
1337                 /* CHARGING is suspended */
1338                 break;
1339
1340         case STATE_BATT_REMOVED_INIT:
1341                 abx500_chargalg_stop_charging(di);
1342                 abx500_chargalg_state_to(di, STATE_BATT_REMOVED);
1343                 /* Intentional fallthrough */
1344
1345         case STATE_BATT_REMOVED:
1346                 if (!di->events.batt_rem)
1347                         abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
1348                 break;
1349
1350         case STATE_HW_TEMP_PROTECT_INIT:
1351                 abx500_chargalg_stop_charging(di);
1352                 abx500_chargalg_state_to(di, STATE_HW_TEMP_PROTECT);
1353                 /* Intentional fallthrough */
1354
1355         case STATE_HW_TEMP_PROTECT:
1356                 if (!di->events.main_thermal_prot &&
1357                                 !di->events.usb_thermal_prot)
1358                         abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
1359                 break;
1360
1361         case STATE_OVV_PROTECT_INIT:
1362                 abx500_chargalg_stop_charging(di);
1363                 abx500_chargalg_state_to(di, STATE_OVV_PROTECT);
1364                 /* Intentional fallthrough */
1365
1366         case STATE_OVV_PROTECT:
1367                 if (!di->events.vbus_ovv &&
1368                                 !di->events.main_ovv &&
1369                                 !di->events.batt_ovv &&
1370                                 di->chg_info.usb_chg_ok &&
1371                                 di->chg_info.ac_chg_ok)
1372                         abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
1373                 break;
1374
1375         case STATE_CHG_NOT_OK_INIT:
1376                 abx500_chargalg_stop_charging(di);
1377                 abx500_chargalg_state_to(di, STATE_CHG_NOT_OK);
1378                 /* Intentional fallthrough */
1379
1380         case STATE_CHG_NOT_OK:
1381                 if (!di->events.mainextchnotok &&
1382                                 !di->events.usbchargernotok)
1383                         abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
1384                 break;
1385
1386         case STATE_SAFETY_TIMER_EXPIRED_INIT:
1387                 abx500_chargalg_stop_charging(di);
1388                 abx500_chargalg_state_to(di, STATE_SAFETY_TIMER_EXPIRED);
1389                 /* Intentional fallthrough */
1390
1391         case STATE_SAFETY_TIMER_EXPIRED:
1392                 /* We exit this state when charger is removed */
1393                 break;
1394
1395         case STATE_NORMAL_INIT:
1396                 abx500_chargalg_start_charging(di,
1397                         di->bat->bat_type[di->bat->batt_id].normal_vol_lvl,
1398                         di->bat->bat_type[di->bat->batt_id].normal_cur_lvl);
1399                 abx500_chargalg_state_to(di, STATE_NORMAL);
1400                 abx500_chargalg_start_safety_timer(di);
1401                 abx500_chargalg_stop_maintenance_timer(di);
1402                 init_maxim_chg_curr(di);
1403                 di->charge_status = POWER_SUPPLY_STATUS_CHARGING;
1404                 di->eoc_cnt = 0;
1405                 di->maintenance_chg = false;
1406                 power_supply_changed(&di->chargalg_psy);
1407
1408                 break;
1409
1410         case STATE_NORMAL:
1411                 handle_maxim_chg_curr(di);
1412                 if (di->charge_status == POWER_SUPPLY_STATUS_FULL &&
1413                         di->maintenance_chg) {
1414                         if (di->bat->no_maintenance)
1415                                 abx500_chargalg_state_to(di,
1416                                         STATE_WAIT_FOR_RECHARGE_INIT);
1417                         else
1418                                 abx500_chargalg_state_to(di,
1419                                         STATE_MAINTENANCE_A_INIT);
1420                 }
1421                 break;
1422
1423         /* This state will be used when the maintenance state is disabled */
1424         case STATE_WAIT_FOR_RECHARGE_INIT:
1425                 abx500_chargalg_hold_charging(di);
1426                 abx500_chargalg_state_to(di, STATE_WAIT_FOR_RECHARGE);
1427                 di->rch_cnt = RCH_COND_CNT;
1428                 /* Intentional fallthrough */
1429
1430         case STATE_WAIT_FOR_RECHARGE:
1431                 if (di->batt_data.volt <=
1432                         di->bat->bat_type[di->bat->batt_id].recharge_vol) {
1433                         if (di->rch_cnt-- == 0)
1434                                 abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
1435                 } else
1436                         di->rch_cnt = RCH_COND_CNT;
1437                 break;
1438
1439         case STATE_MAINTENANCE_A_INIT:
1440                 abx500_chargalg_stop_safety_timer(di);
1441                 abx500_chargalg_start_maintenance_timer(di,
1442                         di->bat->bat_type[
1443                                 di->bat->batt_id].maint_a_chg_timer_h);
1444                 abx500_chargalg_start_charging(di,
1445                         di->bat->bat_type[
1446                                 di->bat->batt_id].maint_a_vol_lvl,
1447                         di->bat->bat_type[
1448                                 di->bat->batt_id].maint_a_cur_lvl);
1449                 abx500_chargalg_state_to(di, STATE_MAINTENANCE_A);
1450                 power_supply_changed(&di->chargalg_psy);
1451                 /* Intentional fallthrough*/
1452
1453         case STATE_MAINTENANCE_A:
1454                 if (di->events.maintenance_timer_expired) {
1455                         abx500_chargalg_stop_maintenance_timer(di);
1456                         abx500_chargalg_state_to(di, STATE_MAINTENANCE_B_INIT);
1457                 }
1458                 break;
1459
1460         case STATE_MAINTENANCE_B_INIT:
1461                 abx500_chargalg_start_maintenance_timer(di,
1462                         di->bat->bat_type[
1463                                 di->bat->batt_id].maint_b_chg_timer_h);
1464                 abx500_chargalg_start_charging(di,
1465                         di->bat->bat_type[
1466                                 di->bat->batt_id].maint_b_vol_lvl,
1467                         di->bat->bat_type[
1468                                 di->bat->batt_id].maint_b_cur_lvl);
1469                 abx500_chargalg_state_to(di, STATE_MAINTENANCE_B);
1470                 power_supply_changed(&di->chargalg_psy);
1471                 /* Intentional fallthrough*/
1472
1473         case STATE_MAINTENANCE_B:
1474                 if (di->events.maintenance_timer_expired) {
1475                         abx500_chargalg_stop_maintenance_timer(di);
1476                         abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
1477                 }
1478                 break;
1479
1480         case STATE_TEMP_LOWHIGH_INIT:
1481                 abx500_chargalg_start_charging(di,
1482                         di->bat->bat_type[
1483                                 di->bat->batt_id].low_high_vol_lvl,
1484                         di->bat->bat_type[
1485                                 di->bat->batt_id].low_high_cur_lvl);
1486                 abx500_chargalg_stop_maintenance_timer(di);
1487                 di->charge_status = POWER_SUPPLY_STATUS_CHARGING;
1488                 abx500_chargalg_state_to(di, STATE_TEMP_LOWHIGH);
1489                 power_supply_changed(&di->chargalg_psy);
1490                 /* Intentional fallthrough */
1491
1492         case STATE_TEMP_LOWHIGH:
1493                 if (!di->events.btemp_lowhigh)
1494                         abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
1495                 break;
1496
1497         case STATE_WD_EXPIRED_INIT:
1498                 abx500_chargalg_stop_charging(di);
1499                 abx500_chargalg_state_to(di, STATE_WD_EXPIRED);
1500                 /* Intentional fallthrough */
1501
1502         case STATE_WD_EXPIRED:
1503                 if (!di->events.ac_wd_expired &&
1504                                 !di->events.usb_wd_expired)
1505                         abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
1506                 break;
1507
1508         case STATE_TEMP_UNDEROVER_INIT:
1509                 abx500_chargalg_stop_charging(di);
1510                 abx500_chargalg_state_to(di, STATE_TEMP_UNDEROVER);
1511                 /* Intentional fallthrough */
1512
1513         case STATE_TEMP_UNDEROVER:
1514                 if (!di->events.btemp_underover)
1515                         abx500_chargalg_state_to(di, STATE_NORMAL_INIT);
1516                 break;
1517         }
1518
1519         /* Start charging directly if the new state is a charge state */
1520         if (di->charge_state == STATE_NORMAL_INIT ||
1521                         di->charge_state == STATE_MAINTENANCE_A_INIT ||
1522                         di->charge_state == STATE_MAINTENANCE_B_INIT)
1523                 queue_work(di->chargalg_wq, &di->chargalg_work);
1524 }
1525
1526 /**
1527  * abx500_chargalg_periodic_work() - Periodic work for the algorithm
1528  * @work:       pointer to the work_struct structure
1529  *
1530  * Work queue function for the charging algorithm
1531  */
1532 static void abx500_chargalg_periodic_work(struct work_struct *work)
1533 {
1534         struct abx500_chargalg *di = container_of(work,
1535                 struct abx500_chargalg, chargalg_periodic_work.work);
1536
1537         abx500_chargalg_algorithm(di);
1538
1539         /*
1540          * If a charger is connected then the battery has to be monitored
1541          * frequently, else the work can be delayed.
1542          */
1543         if (di->chg_info.conn_chg)
1544                 queue_delayed_work(di->chargalg_wq,
1545                         &di->chargalg_periodic_work,
1546                         di->bat->interval_charging * HZ);
1547         else
1548                 queue_delayed_work(di->chargalg_wq,
1549                         &di->chargalg_periodic_work,
1550                         di->bat->interval_not_charging * HZ);
1551 }
1552
1553 /**
1554  * abx500_chargalg_wd_work() - periodic work to kick the charger watchdog
1555  * @work:       pointer to the work_struct structure
1556  *
1557  * Work queue function for kicking the charger watchdog
1558  */
1559 static void abx500_chargalg_wd_work(struct work_struct *work)
1560 {
1561         int ret;
1562         struct abx500_chargalg *di = container_of(work,
1563                 struct abx500_chargalg, chargalg_wd_work.work);
1564
1565         dev_dbg(di->dev, "abx500_chargalg_wd_work\n");
1566
1567         ret = abx500_chargalg_kick_watchdog(di);
1568         if (ret < 0)
1569                 dev_err(di->dev, "failed to kick watchdog\n");
1570
1571         queue_delayed_work(di->chargalg_wq,
1572                 &di->chargalg_wd_work, CHG_WD_INTERVAL);
1573 }
1574
1575 /**
1576  * abx500_chargalg_work() - Work to run the charging algorithm instantly
1577  * @work:       pointer to the work_struct structure
1578  *
1579  * Work queue function for calling the charging algorithm
1580  */
1581 static void abx500_chargalg_work(struct work_struct *work)
1582 {
1583         struct abx500_chargalg *di = container_of(work,
1584                 struct abx500_chargalg, chargalg_work);
1585
1586         abx500_chargalg_algorithm(di);
1587 }
1588
1589 /**
1590  * abx500_chargalg_get_property() - get the chargalg properties
1591  * @psy:        pointer to the power_supply structure
1592  * @psp:        pointer to the power_supply_property structure
1593  * @val:        pointer to the power_supply_propval union
1594  *
1595  * This function gets called when an application tries to get the
1596  * chargalg properties by reading the sysfs files.
1597  * status:     charging/discharging/full/unknown
1598  * health:     health of the battery
1599  * Returns error code in case of failure else 0 on success
1600  */
1601 static int abx500_chargalg_get_property(struct power_supply *psy,
1602         enum power_supply_property psp,
1603         union power_supply_propval *val)
1604 {
1605         struct abx500_chargalg *di;
1606
1607         di = to_abx500_chargalg_device_info(psy);
1608
1609         switch (psp) {
1610         case POWER_SUPPLY_PROP_STATUS:
1611                 val->intval = di->charge_status;
1612                 break;
1613         case POWER_SUPPLY_PROP_HEALTH:
1614                 if (di->events.batt_ovv) {
1615                         val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
1616                 } else if (di->events.btemp_underover) {
1617                         if (di->batt_data.temp <= di->bat->temp_under)
1618                                 val->intval = POWER_SUPPLY_HEALTH_COLD;
1619                         else
1620                                 val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
1621                 } else {
1622                         val->intval = POWER_SUPPLY_HEALTH_GOOD;
1623                 }
1624                 break;
1625         default:
1626                 return -EINVAL;
1627         }
1628         return 0;
1629 }
1630
1631 /* Exposure to the sysfs interface */
1632
1633 /**
1634  * abx500_chargalg_sysfs_charger() - sysfs store operations
1635  * @kobj:      pointer to the struct kobject
1636  * @attr:      pointer to the struct attribute
1637  * @buf:       buffer that holds the parameter passed from userspace
1638  * @length:    length of the parameter passed
1639  *
1640  * Returns length of the buffer(input taken from user space) on success
1641  * else error code on failure
1642  * The operation to be performed on passing the parameters from the user space.
1643  */
1644 static ssize_t abx500_chargalg_sysfs_charger(struct kobject *kobj,
1645         struct attribute *attr, const char *buf, size_t length)
1646 {
1647         struct abx500_chargalg *di = container_of(kobj,
1648                 struct abx500_chargalg, chargalg_kobject);
1649         long int param;
1650         int ac_usb;
1651         int ret;
1652         char entry = *attr->name;
1653
1654         switch (entry) {
1655         case 'c':
1656                 ret = strict_strtol(buf, 10, &param);
1657                 if (ret < 0)
1658                         return ret;
1659
1660                 ac_usb = param;
1661                 switch (ac_usb) {
1662                 case 0:
1663                         /* Disable charging */
1664                         di->susp_status.ac_suspended = true;
1665                         di->susp_status.usb_suspended = true;
1666                         di->susp_status.suspended_change = true;
1667                         /* Trigger a state change */
1668                         queue_work(di->chargalg_wq,
1669                                 &di->chargalg_work);
1670                         break;
1671                 case 1:
1672                         /* Enable AC Charging */
1673                         di->susp_status.ac_suspended = false;
1674                         di->susp_status.suspended_change = true;
1675                         /* Trigger a state change */
1676                         queue_work(di->chargalg_wq,
1677                                 &di->chargalg_work);
1678                         break;
1679                 case 2:
1680                         /* Enable USB charging */
1681                         di->susp_status.usb_suspended = false;
1682                         di->susp_status.suspended_change = true;
1683                         /* Trigger a state change */
1684                         queue_work(di->chargalg_wq,
1685                                 &di->chargalg_work);
1686                         break;
1687                 default:
1688                         dev_info(di->dev, "Wrong input\n"
1689                                 "Enter 0. Disable AC/USB Charging\n"
1690                                 "1. Enable AC charging\n"
1691                                 "2. Enable USB Charging\n");
1692                 };
1693                 break;
1694         };
1695         return strlen(buf);
1696 }
1697
1698 static struct attribute abx500_chargalg_en_charger = \
1699 {
1700         .name = "chargalg",
1701         .mode = S_IWUGO,
1702 };
1703
1704 static struct attribute *abx500_chargalg_chg[] = {
1705         &abx500_chargalg_en_charger,
1706         NULL
1707 };
1708
1709 static const struct sysfs_ops abx500_chargalg_sysfs_ops = {
1710         .store = abx500_chargalg_sysfs_charger,
1711 };
1712
1713 static struct kobj_type abx500_chargalg_ktype = {
1714         .sysfs_ops = &abx500_chargalg_sysfs_ops,
1715         .default_attrs = abx500_chargalg_chg,
1716 };
1717
1718 /**
1719  * abx500_chargalg_sysfs_exit() - de-init of sysfs entry
1720  * @di:                pointer to the struct abx500_chargalg
1721  *
1722  * This function removes the entry in sysfs.
1723  */
1724 static void abx500_chargalg_sysfs_exit(struct abx500_chargalg *di)
1725 {
1726         kobject_del(&di->chargalg_kobject);
1727 }
1728
1729 /**
1730  * abx500_chargalg_sysfs_init() - init of sysfs entry
1731  * @di:                pointer to the struct abx500_chargalg
1732  *
1733  * This function adds an entry in sysfs.
1734  * Returns error code in case of failure else 0(on success)
1735  */
1736 static int abx500_chargalg_sysfs_init(struct abx500_chargalg *di)
1737 {
1738         int ret = 0;
1739
1740         ret = kobject_init_and_add(&di->chargalg_kobject,
1741                 &abx500_chargalg_ktype,
1742                 NULL, "abx500_chargalg");
1743         if (ret < 0)
1744                 dev_err(di->dev, "failed to create sysfs entry\n");
1745
1746         return ret;
1747 }
1748 /* Exposure to the sysfs interface <<END>> */
1749
1750 #if defined(CONFIG_PM)
1751 static int abx500_chargalg_resume(struct platform_device *pdev)
1752 {
1753         struct abx500_chargalg *di = platform_get_drvdata(pdev);
1754
1755         /* Kick charger watchdog if charging (any charger online) */
1756         if (di->chg_info.online_chg)
1757                 queue_delayed_work(di->chargalg_wq, &di->chargalg_wd_work, 0);
1758
1759         /*
1760          * Run the charging algorithm directly to be sure we don't
1761          * do it too seldom
1762          */
1763         queue_delayed_work(di->chargalg_wq, &di->chargalg_periodic_work, 0);
1764
1765         return 0;
1766 }
1767
1768 static int abx500_chargalg_suspend(struct platform_device *pdev,
1769         pm_message_t state)
1770 {
1771         struct abx500_chargalg *di = platform_get_drvdata(pdev);
1772
1773         if (di->chg_info.online_chg)
1774                 cancel_delayed_work_sync(&di->chargalg_wd_work);
1775
1776         cancel_delayed_work_sync(&di->chargalg_periodic_work);
1777
1778         return 0;
1779 }
1780 #else
1781 #define abx500_chargalg_suspend      NULL
1782 #define abx500_chargalg_resume       NULL
1783 #endif
1784
1785 static int __devexit abx500_chargalg_remove(struct platform_device *pdev)
1786 {
1787         struct abx500_chargalg *di = platform_get_drvdata(pdev);
1788
1789         /* sysfs interface to enable/disbale charging from user space */
1790         abx500_chargalg_sysfs_exit(di);
1791
1792         /* Delete the work queue */
1793         destroy_workqueue(di->chargalg_wq);
1794
1795         flush_scheduled_work();
1796         power_supply_unregister(&di->chargalg_psy);
1797         platform_set_drvdata(pdev, NULL);
1798         kfree(di);
1799
1800         return 0;
1801 }
1802
1803 static int __devinit abx500_chargalg_probe(struct platform_device *pdev)
1804 {
1805         struct abx500_bm_plat_data *plat_data;
1806         int ret = 0;
1807
1808         struct abx500_chargalg *di =
1809                 kzalloc(sizeof(struct abx500_chargalg), GFP_KERNEL);
1810         if (!di)
1811                 return -ENOMEM;
1812
1813         /* get device struct */
1814         di->dev = &pdev->dev;
1815
1816         plat_data = pdev->dev.platform_data;
1817         di->pdata = plat_data->chargalg;
1818         di->bat = plat_data->battery;
1819
1820         /* chargalg supply */
1821         di->chargalg_psy.name = "abx500_chargalg";
1822         di->chargalg_psy.type = POWER_SUPPLY_TYPE_BATTERY;
1823         di->chargalg_psy.properties = abx500_chargalg_props;
1824         di->chargalg_psy.num_properties = ARRAY_SIZE(abx500_chargalg_props);
1825         di->chargalg_psy.get_property = abx500_chargalg_get_property;
1826         di->chargalg_psy.supplied_to = di->pdata->supplied_to;
1827         di->chargalg_psy.num_supplicants = di->pdata->num_supplicants;
1828         di->chargalg_psy.external_power_changed =
1829                 abx500_chargalg_external_power_changed;
1830
1831         /* Initilialize safety timer */
1832         init_timer(&di->safety_timer);
1833         di->safety_timer.function = abx500_chargalg_safety_timer_expired;
1834         di->safety_timer.data = (unsigned long) di;
1835
1836         /* Initilialize maintenance timer */
1837         init_timer(&di->maintenance_timer);
1838         di->maintenance_timer.function =
1839                 abx500_chargalg_maintenance_timer_expired;
1840         di->maintenance_timer.data = (unsigned long) di;
1841
1842         /* Create a work queue for the chargalg */
1843         di->chargalg_wq =
1844                 create_singlethread_workqueue("abx500_chargalg_wq");
1845         if (di->chargalg_wq == NULL) {
1846                 dev_err(di->dev, "failed to create work queue\n");
1847                 goto free_device_info;
1848         }
1849
1850         /* Init work for chargalg */
1851         INIT_DELAYED_WORK_DEFERRABLE(&di->chargalg_periodic_work,
1852                 abx500_chargalg_periodic_work);
1853         INIT_DELAYED_WORK_DEFERRABLE(&di->chargalg_wd_work,
1854                 abx500_chargalg_wd_work);
1855
1856         /* Init work for chargalg */
1857         INIT_WORK(&di->chargalg_work, abx500_chargalg_work);
1858
1859         /* To detect charger at startup */
1860         di->chg_info.prev_conn_chg = -1;
1861
1862         /* Register chargalg power supply class */
1863         ret = power_supply_register(di->dev, &di->chargalg_psy);
1864         if (ret) {
1865                 dev_err(di->dev, "failed to register chargalg psy\n");
1866                 goto free_chargalg_wq;
1867         }
1868
1869         platform_set_drvdata(pdev, di);
1870
1871         /* sysfs interface to enable/disable charging from user space */
1872         ret = abx500_chargalg_sysfs_init(di);
1873         if (ret) {
1874                 dev_err(di->dev, "failed to create sysfs entry\n");
1875                 goto free_psy;
1876         }
1877
1878         /* Run the charging algorithm */
1879         queue_delayed_work(di->chargalg_wq, &di->chargalg_periodic_work, 0);
1880
1881         dev_info(di->dev, "probe success\n");
1882         return ret;
1883
1884 free_psy:
1885         power_supply_unregister(&di->chargalg_psy);
1886 free_chargalg_wq:
1887         destroy_workqueue(di->chargalg_wq);
1888 free_device_info:
1889         kfree(di);
1890
1891         return ret;
1892 }
1893
1894 static struct platform_driver abx500_chargalg_driver = {
1895         .probe = abx500_chargalg_probe,
1896         .remove = __devexit_p(abx500_chargalg_remove),
1897         .suspend = abx500_chargalg_suspend,
1898         .resume = abx500_chargalg_resume,
1899         .driver = {
1900                 .name = "abx500-chargalg",
1901                 .owner = THIS_MODULE,
1902         },
1903 };
1904
1905 static int __init abx500_chargalg_init(void)
1906 {
1907         return platform_driver_register(&abx500_chargalg_driver);
1908 }
1909
1910 static void __exit abx500_chargalg_exit(void)
1911 {
1912         platform_driver_unregister(&abx500_chargalg_driver);
1913 }
1914
1915 module_init(abx500_chargalg_init);
1916 module_exit(abx500_chargalg_exit);
1917
1918 MODULE_LICENSE("GPL v2");
1919 MODULE_AUTHOR("Johan Palsson, Karl Komierowski");
1920 MODULE_ALIAS("platform:abx500-chargalg");
1921 MODULE_DESCRIPTION("abx500 battery charging algorithm");