drivers/power/supply/ab8500_chargalg.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) ST-Ericsson SA 2012
   4  * Copyright (c) 2012 Sony Mobile Communications AB
   5  *
   6  * Charging algorithm driver for AB8500
   7  *
   8  * Authors:
   9  *      Johan Palsson <johan.palsson@stericsson.com>
  10  *      Karl Komierowski <karl.komierowski@stericsson.com>
  11  *      Arun R Murthy <arun.murthy@stericsson.com>
  12  *      Author: Imre Sunyi <imre.sunyi@sonymobile.com>
  13  */
  14
  15 #include <linux/init.h>
  16 #include <linux/module.h>
  17 #include <linux/device.h>
  18 #include <linux/component.h>
  19 #include <linux/hrtimer.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/delay.h>
  22 #include <linux/slab.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/power_supply.h>
  25 #include <linux/completion.h>
  26 #include <linux/workqueue.h>
  27 #include <linux/kobject.h>
  28 #include <linux/of.h>
  29 #include <linux/mfd/core.h>
  30 #include <linux/mfd/abx500.h>
  31 #include <linux/mfd/abx500/ab8500.h>
  32 #include <linux/notifier.h>
  33
  34 #include "ab8500-bm.h"
  35 #include "ab8500-chargalg.h"
  36
  37 /* Watchdog kick interval */
  38 #define CHG_WD_INTERVAL                 (6 * HZ)
  39
  40 /* End-of-charge criteria counter */
  41 #define EOC_COND_CNT                    10
  42
  43 /* One hour expressed in seconds */
  44 #define ONE_HOUR_IN_SECONDS            3600
  45
  46 /* Five minutes expressed in seconds */
  47 #define FIVE_MINUTES_IN_SECONDS        300
  48
  49 #define CHARGALG_CURR_STEP_LOW          0
  50 #define CHARGALG_CURR_STEP_HIGH 100
  51
  52 enum ab8500_chargers {
  53         NO_CHG,
  54         AC_CHG,
  55         USB_CHG,
  56 };
  57
  58 struct ab8500_chargalg_charger_info {
  59         enum ab8500_chargers conn_chg;
  60         enum ab8500_chargers prev_conn_chg;
  61         enum ab8500_chargers online_chg;
  62         enum ab8500_chargers prev_online_chg;
  63         enum ab8500_chargers charger_type;
  64         bool usb_chg_ok;
  65         bool ac_chg_ok;
  66         int usb_volt;
  67         int usb_curr;
  68         int ac_volt;
  69         int ac_curr;
  70         int usb_vset;
  71         int usb_iset;
  72         int ac_vset;
  73         int ac_iset;
  74 };
  75
  76 struct ab8500_chargalg_suspension_status {
  77         bool suspended_change;
  78         bool ac_suspended;
  79         bool usb_suspended;
  80 };
  81
  82 struct ab8500_chargalg_current_step_status {
  83         bool curr_step_change;
  84         int curr_step;
  85 };
  86
  87 struct ab8500_chargalg_battery_data {
  88         int temp;
  89         int volt;
  90         int avg_curr;
  91         int inst_curr;
  92         int percent;
  93 };
  94
  95 enum ab8500_chargalg_states {
  96         STATE_HANDHELD_INIT,
  97         STATE_HANDHELD,
  98         STATE_CHG_NOT_OK_INIT,
  99         STATE_CHG_NOT_OK,
 100         STATE_HW_TEMP_PROTECT_INIT,
 101         STATE_HW_TEMP_PROTECT,
 102         STATE_NORMAL_INIT,
 103         STATE_NORMAL,
 104         STATE_WAIT_FOR_RECHARGE_INIT,
 105         STATE_WAIT_FOR_RECHARGE,
 106         STATE_MAINTENANCE_A_INIT,
 107         STATE_MAINTENANCE_A,
 108         STATE_MAINTENANCE_B_INIT,
 109         STATE_MAINTENANCE_B,
 110         STATE_TEMP_UNDEROVER_INIT,
 111         STATE_TEMP_UNDEROVER,
 112         STATE_TEMP_LOWHIGH_INIT,
 113         STATE_TEMP_LOWHIGH,
 114         STATE_SUSPENDED_INIT,
 115         STATE_SUSPENDED,
 116         STATE_OVV_PROTECT_INIT,
 117         STATE_OVV_PROTECT,
 118         STATE_SAFETY_TIMER_EXPIRED_INIT,
 119         STATE_SAFETY_TIMER_EXPIRED,
 120         STATE_BATT_REMOVED_INIT,
 121         STATE_BATT_REMOVED,
 122         STATE_WD_EXPIRED_INIT,
 123         STATE_WD_EXPIRED,
 124 };
 125
 126 static const char * const states[] = {
 127         "HANDHELD_INIT",
 128         "HANDHELD",
 129         "CHG_NOT_OK_INIT",
 130         "CHG_NOT_OK",
 131         "HW_TEMP_PROTECT_INIT",
 132         "HW_TEMP_PROTECT",
 133         "NORMAL_INIT",
 134         "NORMAL",
 135         "WAIT_FOR_RECHARGE_INIT",
 136         "WAIT_FOR_RECHARGE",
 137         "MAINTENANCE_A_INIT",
 138         "MAINTENANCE_A",
 139         "MAINTENANCE_B_INIT",
 140         "MAINTENANCE_B",
 141         "TEMP_UNDEROVER_INIT",
 142         "TEMP_UNDEROVER",
 143         "TEMP_LOWHIGH_INIT",
 144         "TEMP_LOWHIGH",
 145         "SUSPENDED_INIT",
 146         "SUSPENDED",
 147         "OVV_PROTECT_INIT",
 148         "OVV_PROTECT",
 149         "SAFETY_TIMER_EXPIRED_INIT",
 150         "SAFETY_TIMER_EXPIRED",
 151         "BATT_REMOVED_INIT",
 152         "BATT_REMOVED",
 153         "WD_EXPIRED_INIT",
 154         "WD_EXPIRED",
 155 };
 156
 157 struct ab8500_chargalg_events {
 158         bool batt_unknown;
 159         bool mainextchnotok;
 160         bool batt_ovv;
 161         bool batt_rem;
 162         bool btemp_underover;
 163         bool btemp_lowhigh;
 164         bool main_thermal_prot;
 165         bool usb_thermal_prot;
 166         bool main_ovv;
 167         bool vbus_ovv;
 168         bool usbchargernotok;
 169         bool safety_timer_expired;
 170         bool maintenance_timer_expired;
 171         bool ac_wd_expired;
 172         bool usb_wd_expired;
 173         bool ac_cv_active;
 174         bool usb_cv_active;
 175         bool vbus_collapsed;
 176 };
 177
 178 /**
 179  * struct ab8500_charge_curr_maximization - Charger maximization parameters
 180  * @original_iset:      the non optimized/maximised charger current
 181  * @current_iset:       the charging current used at this moment
 182  * @test_delta_i:       the delta between the current we want to charge and the
 183                         current that is really going into the battery
 184  * @condition_cnt:      number of iterations needed before a new charger current
 185                         is set
 186  * @max_current:        maximum charger current
 187  * @wait_cnt:           to avoid too fast current step down in case of charger
 188  *                      voltage collapse, we insert this delay between step
 189  *                      down
 190  * @level:              tells in how many steps the charging current has been
 191                         increased
 192  */
 193 struct ab8500_charge_curr_maximization {
 194         int original_iset;
 195         int current_iset;
 196         int test_delta_i;
 197         int condition_cnt;
 198         int max_current;
 199         int wait_cnt;
 200         u8 level;
 201 };
 202
 203 enum maxim_ret {
 204         MAXIM_RET_NOACTION,
 205         MAXIM_RET_CHANGE,
 206         MAXIM_RET_IBAT_TOO_HIGH,
 207 };
 208
 209 /**
 210  * struct ab8500_chargalg - ab8500 Charging algorithm device information
 211  * @dev:                pointer to the structure device
 212  * @charge_status:      battery operating status
 213  * @eoc_cnt:            counter used to determine end-of_charge
 214  * @maintenance_chg:    indicate if maintenance charge is active
 215  * @t_hyst_norm         temperature hysteresis when the temperature has been
 216  *                      over or under normal limits
 217  * @t_hyst_lowhigh      temperature hysteresis when the temperature has been
 218  *                      over or under the high or low limits
 219  * @charge_state:       current state of the charging algorithm
 220  * @ccm                 charging current maximization parameters
 221  * @chg_info:           information about connected charger types
 222  * @batt_data:          data of the battery
 223  * @susp_status:        current charger suspension status
 224  * @bm:                 Platform specific battery management information
 225  * @curr_status:        Current step status for over-current protection
 226  * @parent:             pointer to the struct ab8500
 227  * @chargalg_psy:       structure that holds the battery properties exposed by
 228  *                      the charging algorithm
 229  * @events:             structure for information about events triggered
 230  * @chargalg_wq:                work queue for running the charging algorithm
 231  * @chargalg_periodic_work:     work to run the charging algorithm periodically
 232  * @chargalg_wd_work:           work to kick the charger watchdog periodically
 233  * @chargalg_work:              work to run the charging algorithm instantly
 234  * @safety_timer:               charging safety timer
 235  * @maintenance_timer:          maintenance charging timer
 236  * @chargalg_kobject:           structure of type kobject
 237  */
 238 struct ab8500_chargalg {
 239         struct device *dev;
 240         int charge_status;
 241         int eoc_cnt;
 242         bool maintenance_chg;
 243         int t_hyst_norm;
 244         int t_hyst_lowhigh;
 245         enum ab8500_chargalg_states charge_state;
 246         struct ab8500_charge_curr_maximization ccm;
 247         struct ab8500_chargalg_charger_info chg_info;
 248         struct ab8500_chargalg_battery_data batt_data;
 249         struct ab8500_chargalg_suspension_status susp_status;
 250         struct ab8500 *parent;
 251         struct ab8500_chargalg_current_step_status curr_status;
 252         struct ab8500_bm_data *bm;
 253         struct power_supply *chargalg_psy;
 254         struct ux500_charger *ac_chg;
 255         struct ux500_charger *usb_chg;
 256         struct ab8500_chargalg_events events;
 257         struct workqueue_struct *chargalg_wq;
 258         struct delayed_work chargalg_periodic_work;
 259         struct delayed_work chargalg_wd_work;
 260         struct work_struct chargalg_work;
 261         struct hrtimer safety_timer;
 262         struct hrtimer maintenance_timer;
 263         struct kobject chargalg_kobject;
 264 };
 265
 266 /*External charger prepare notifier*/
 267 BLOCKING_NOTIFIER_HEAD(charger_notifier_list);
 268
 269 /* Main battery properties */
 270 static enum power_supply_property ab8500_chargalg_props[] = {
 271         POWER_SUPPLY_PROP_STATUS,
 272         POWER_SUPPLY_PROP_HEALTH,
 273 };
 274
 275 struct ab8500_chargalg_sysfs_entry {
 276         struct attribute attr;
 277         ssize_t (*show)(struct ab8500_chargalg *di, char *buf);
 278         ssize_t (*store)(struct ab8500_chargalg *di, const char *buf, size_t length);
 279 };
 280
 281 /**
 282  * ab8500_chargalg_safety_timer_expired() - Expiration of the safety timer
 283  * @timer:     pointer to the hrtimer structure
 284  *
 285  * This function gets called when the safety timer for the charger
 286  * expires
 287  */
 288 static enum hrtimer_restart
 289 ab8500_chargalg_safety_timer_expired(struct hrtimer *timer)
 290 {
 291         struct ab8500_chargalg *di = container_of(timer, struct ab8500_chargalg,
 292                                                   safety_timer);
 293         dev_err(di->dev, "Safety timer expired\n");
 294         di->events.safety_timer_expired = true;
 295
 296         /* Trigger execution of the algorithm instantly */
 297         queue_work(di->chargalg_wq, &di->chargalg_work);
 298
 299         return HRTIMER_NORESTART;
 300 }
 301
 302 /**
 303  * ab8500_chargalg_maintenance_timer_expired() - Expiration of
 304  * the maintenance timer
 305  * @timer:     pointer to the timer structure
 306  *
 307  * This function gets called when the maintenence timer
 308  * expires
 309  */
 310 static enum hrtimer_restart
 311 ab8500_chargalg_maintenance_timer_expired(struct hrtimer *timer)
 312 {
 313
 314         struct ab8500_chargalg *di = container_of(timer, struct ab8500_chargalg,
 315                                                   maintenance_timer);
 316
 317         dev_dbg(di->dev, "Maintenance timer expired\n");
 318         di->events.maintenance_timer_expired = true;
 319
 320         /* Trigger execution of the algorithm instantly */
 321         queue_work(di->chargalg_wq, &di->chargalg_work);
 322
 323         return HRTIMER_NORESTART;
 324 }
 325
 326 /**
 327  * ab8500_chargalg_state_to() - Change charge state
 328  * @di:         pointer to the ab8500_chargalg structure
 329  *
 330  * This function gets called when a charge state change should occur
 331  */
 332 static void ab8500_chargalg_state_to(struct ab8500_chargalg *di,
 333         enum ab8500_chargalg_states state)
 334 {
 335         dev_dbg(di->dev,
 336                 "State changed: %s (From state: [%d] %s =to=> [%d] %s )\n",
 337                 di->charge_state == state ? "NO" : "YES",
 338                 di->charge_state,
 339                 states[di->charge_state],
 340                 state,
 341                 states[state]);
 342
 343         di->charge_state = state;
 344 }
 345
 346 static int ab8500_chargalg_check_charger_enable(struct ab8500_chargalg *di)
 347 {
 348         switch (di->charge_state) {
 349         case STATE_NORMAL:
 350         case STATE_MAINTENANCE_A:
 351         case STATE_MAINTENANCE_B:
 352                 break;
 353         default:
 354                 return 0;
 355         }
 356
 357         if (di->chg_info.charger_type & USB_CHG) {
 358                 return di->usb_chg->ops.check_enable(di->usb_chg,
 359                         di->bm->bat_type[di->bm->batt_id].normal_vol_lvl,
 360                         di->bm->bat_type[di->bm->batt_id].normal_cur_lvl);
 361         } else if ((di->chg_info.charger_type & AC_CHG) &&
 362                    !(di->ac_chg->external)) {
 363                 return di->ac_chg->ops.check_enable(di->ac_chg,
 364                         di->bm->bat_type[di->bm->batt_id].normal_vol_lvl,
 365                         di->bm->bat_type[di->bm->batt_id].normal_cur_lvl);
 366         }
 367         return 0;
 368 }
 369
 370 /**
 371  * ab8500_chargalg_check_charger_connection() - Check charger connection change
 372  * @di:         pointer to the ab8500_chargalg structure
 373  *
 374  * This function will check if there is a change in the charger connection
 375  * and change charge state accordingly. AC has precedence over USB.
 376  */
 377 static int ab8500_chargalg_check_charger_connection(struct ab8500_chargalg *di)
 378 {
 379         if (di->chg_info.conn_chg != di->chg_info.prev_conn_chg ||
 380                 di->susp_status.suspended_change) {
 381                 /*
 382                  * Charger state changed or suspension
 383                  * has changed since last update
 384                  */
 385                 if ((di->chg_info.conn_chg & AC_CHG) &&
 386                         !di->susp_status.ac_suspended) {
 387                         dev_dbg(di->dev, "Charging source is AC\n");
 388                         if (di->chg_info.charger_type != AC_CHG) {
 389                                 di->chg_info.charger_type = AC_CHG;
 390                                 ab8500_chargalg_state_to(di, STATE_NORMAL_INIT);
 391                         }
 392                 } else if ((di->chg_info.conn_chg & USB_CHG) &&
 393                         !di->susp_status.usb_suspended) {
 394                         dev_dbg(di->dev, "Charging source is USB\n");
 395                         di->chg_info.charger_type = USB_CHG;
 396                         ab8500_chargalg_state_to(di, STATE_NORMAL_INIT);
 397                 } else if (di->chg_info.conn_chg &&
 398                         (di->susp_status.ac_suspended ||
 399                         di->susp_status.usb_suspended)) {
 400                         dev_dbg(di->dev, "Charging is suspended\n");
 401                         di->chg_info.charger_type = NO_CHG;
 402                         ab8500_chargalg_state_to(di, STATE_SUSPENDED_INIT);
 403                 } else {
 404                         dev_dbg(di->dev, "Charging source is OFF\n");
 405                         di->chg_info.charger_type = NO_CHG;
 406                         ab8500_chargalg_state_to(di, STATE_HANDHELD_INIT);
 407                 }
 408                 di->chg_info.prev_conn_chg = di->chg_info.conn_chg;
 409                 di->susp_status.suspended_change = false;
 410         }
 411         return di->chg_info.conn_chg;
 412 }
 413
 414 /**
 415  * ab8500_chargalg_check_current_step_status() - Check charging current
 416  * step status.
 417  * @di:         pointer to the ab8500_chargalg structure
 418  *
 419  * This function will check if there is a change in the charging current step
 420  * and change charge state accordingly.
 421  */
 422 static void ab8500_chargalg_check_current_step_status
 423         (struct ab8500_chargalg *di)
 424 {
 425         if (di->curr_status.curr_step_change)
 426                 ab8500_chargalg_state_to(di, STATE_NORMAL_INIT);
 427         di->curr_status.curr_step_change = false;
 428 }
 429
 430 /**
 431  * ab8500_chargalg_start_safety_timer() - Start charging safety timer
 432  * @di:         pointer to the ab8500_chargalg structure
 433  *
 434  * The safety timer is used to avoid overcharging of old or bad batteries.
 435  * There are different timers for AC and USB
 436  */
 437 static void ab8500_chargalg_start_safety_timer(struct ab8500_chargalg *di)
 438 {
 439         /* Charger-dependent expiration time in hours*/
 440         int timer_expiration = 0;
 441
 442         switch (di->chg_info.charger_type) {
 443         case AC_CHG:
 444                 timer_expiration = di->bm->main_safety_tmr_h;
 445                 break;
 446
 447         case USB_CHG:
 448                 timer_expiration = di->bm->usb_safety_tmr_h;
 449                 break;
 450
 451         default:
 452                 dev_err(di->dev, "Unknown charger to charge from\n");
 453                 break;
 454         }
 455
 456         di->events.safety_timer_expired = false;
 457         hrtimer_set_expires_range(&di->safety_timer,
 458                 ktime_set(timer_expiration * ONE_HOUR_IN_SECONDS, 0),
 459                 ktime_set(FIVE_MINUTES_IN_SECONDS, 0));
 460         hrtimer_start_expires(&di->safety_timer, HRTIMER_MODE_REL);
 461 }
 462
 463 /**
 464  * ab8500_chargalg_stop_safety_timer() - Stop charging safety timer
 465  * @di:         pointer to the ab8500_chargalg structure
 466  *
 467  * The safety timer is stopped whenever the NORMAL state is exited
 468  */
 469 static void ab8500_chargalg_stop_safety_timer(struct ab8500_chargalg *di)
 470 {
 471         if (hrtimer_try_to_cancel(&di->safety_timer) >= 0)
 472                 di->events.safety_timer_expired = false;
 473 }
 474
 475 /**
 476  * ab8500_chargalg_start_maintenance_timer() - Start charging maintenance timer
 477  * @di:         pointer to the ab8500_chargalg structure
 478  * @duration:   duration of ther maintenance timer in hours
 479  *
 480  * The maintenance timer is used to maintain the charge in the battery once
 481  * the battery is considered full. These timers are chosen to match the
 482  * discharge curve of the battery
 483  */
 484 static void ab8500_chargalg_start_maintenance_timer(struct ab8500_chargalg *di,
 485         int duration)
 486 {
 487         hrtimer_set_expires_range(&di->maintenance_timer,
 488                 ktime_set(duration * ONE_HOUR_IN_SECONDS, 0),
 489                 ktime_set(FIVE_MINUTES_IN_SECONDS, 0));
 490         di->events.maintenance_timer_expired = false;
 491         hrtimer_start_expires(&di->maintenance_timer, HRTIMER_MODE_REL);
 492 }
 493
 494 /**
 495  * ab8500_chargalg_stop_maintenance_timer() - Stop maintenance timer
 496  * @di:         pointer to the ab8500_chargalg structure
 497  *
 498  * The maintenance timer is stopped whenever maintenance ends or when another
 499  * state is entered
 500  */
 501 static void ab8500_chargalg_stop_maintenance_timer(struct ab8500_chargalg *di)
 502 {
 503         if (hrtimer_try_to_cancel(&di->maintenance_timer) >= 0)
 504                 di->events.maintenance_timer_expired = false;
 505 }
 506
 507 /**
 508  * ab8500_chargalg_kick_watchdog() - Kick charger watchdog
 509  * @di:         pointer to the ab8500_chargalg structure
 510  *
 511  * The charger watchdog have to be kicked periodically whenever the charger is
 512  * on, else the ABB will reset the system
 513  */
 514 static int ab8500_chargalg_kick_watchdog(struct ab8500_chargalg *di)
 515 {
 516         /* Check if charger exists and kick watchdog if charging */
 517         if (di->ac_chg && di->ac_chg->ops.kick_wd &&
 518             di->chg_info.online_chg & AC_CHG) {
 519                 /*
 520                  * If AB charger watchdog expired, pm2xxx charging
 521                  * gets disabled. To be safe, kick both AB charger watchdog
 522                  * and pm2xxx watchdog.
 523                  */
 524                 if (di->ac_chg->external &&
 525                     di->usb_chg && di->usb_chg->ops.kick_wd)
 526                         di->usb_chg->ops.kick_wd(di->usb_chg);
 527
 528                 return di->ac_chg->ops.kick_wd(di->ac_chg);
 529         } else if (di->usb_chg && di->usb_chg->ops.kick_wd &&
 530                         di->chg_info.online_chg & USB_CHG)
 531                 return di->usb_chg->ops.kick_wd(di->usb_chg);
 532
 533         return -ENXIO;
 534 }
 535
 536 /**
 537  * ab8500_chargalg_ac_en() - Turn on/off the AC charger
 538  * @di:         pointer to the ab8500_chargalg structure
 539  * @enable:     charger on/off
 540  * @vset:       requested charger output voltage
 541  * @iset:       requested charger output current
 542  *
 543  * The AC charger will be turned on/off with the requested charge voltage and
 544  * current
 545  */
 546 static int ab8500_chargalg_ac_en(struct ab8500_chargalg *di, int enable,
 547         int vset, int iset)
 548 {
 549         static int ab8500_chargalg_ex_ac_enable_toggle;
 550
 551         if (!di->ac_chg || !di->ac_chg->ops.enable)
 552                 return -ENXIO;
 553
 554         /* Select maximum of what both the charger and the battery supports */
 555         if (di->ac_chg->max_out_volt)
 556                 vset = min(vset, di->ac_chg->max_out_volt);
 557         if (di->ac_chg->max_out_curr)
 558                 iset = min(iset, di->ac_chg->max_out_curr);
 559
 560         di->chg_info.ac_iset = iset;
 561         di->chg_info.ac_vset = vset;
 562
 563         /* Enable external charger */
 564         if (enable && di->ac_chg->external &&
 565             !ab8500_chargalg_ex_ac_enable_toggle) {
 566                 blocking_notifier_call_chain(&charger_notifier_list,
 567                                              0, di->dev);
 568                 ab8500_chargalg_ex_ac_enable_toggle++;
 569         }
 570
 571         return di->ac_chg->ops.enable(di->ac_chg, enable, vset, iset);
 572 }
 573
 574 /**
 575  * ab8500_chargalg_usb_en() - Turn on/off the USB charger
 576  * @di:         pointer to the ab8500_chargalg structure
 577  * @enable:     charger on/off
 578  * @vset:       requested charger output voltage
 579  * @iset:       requested charger output current
 580  *
 581  * The USB charger will be turned on/off with the requested charge voltage and
 582  * current
 583  */
 584 static int ab8500_chargalg_usb_en(struct ab8500_chargalg *di, int enable,
 585         int vset, int iset)
 586 {
 587         if (!di->usb_chg || !di->usb_chg->ops.enable)
 588                 return -ENXIO;
 589
 590         /* Select maximum of what both the charger and the battery supports */
 591         if (di->usb_chg->max_out_volt)
 592                 vset = min(vset, di->usb_chg->max_out_volt);
 593         if (di->usb_chg->max_out_curr)
 594                 iset = min(iset, di->usb_chg->max_out_curr);
 595
 596         di->chg_info.usb_iset = iset;
 597         di->chg_info.usb_vset = vset;
 598
 599         return di->usb_chg->ops.enable(di->usb_chg, enable, vset, iset);
 600 }
 601
 602 /**
 603  * ab8500_chargalg_update_chg_curr() - Update charger current
 604  * @di:         pointer to the ab8500_chargalg structure
 605  * @iset:       requested charger output current
 606  *
 607  * The charger output current will be updated for the charger
 608  * that is currently in use
 609  */
 610 static int ab8500_chargalg_update_chg_curr(struct ab8500_chargalg *di,
 611                 int iset)
 612 {
 613         /* Check if charger exists and update current if charging */
 614         if (di->ac_chg && di->ac_chg->ops.update_curr &&
 615                         di->chg_info.charger_type & AC_CHG) {
 616                 /*
 617                  * Select maximum of what both the charger
 618                  * and the battery supports
 619                  */
 620                 if (di->ac_chg->max_out_curr)
 621                         iset = min(iset, di->ac_chg->max_out_curr);
 622
 623                 di->chg_info.ac_iset = iset;
 624
 625                 return di->ac_chg->ops.update_curr(di->ac_chg, iset);
 626         } else if (di->usb_chg && di->usb_chg->ops.update_curr &&
 627                         di->chg_info.charger_type & USB_CHG) {
 628                 /*
 629                  * Select maximum of what both the charger
 630                  * and the battery supports
 631                  */
 632                 if (di->usb_chg->max_out_curr)
 633                         iset = min(iset, di->usb_chg->max_out_curr);
 634
 635                 di->chg_info.usb_iset = iset;
 636
 637                 return di->usb_chg->ops.update_curr(di->usb_chg, iset);
 638         }
 639
 640         return -ENXIO;
 641 }
 642
 643 /**
 644  * ab8500_chargalg_stop_charging() - Stop charging
 645  * @di:         pointer to the ab8500_chargalg structure
 646  *
 647  * This function is called from any state where charging should be stopped.
 648  * All charging is disabled and all status parameters and timers are changed
 649  * accordingly
 650  */
 651 static void ab8500_chargalg_stop_charging(struct ab8500_chargalg *di)
 652 {
 653         ab8500_chargalg_ac_en(di, false, 0, 0);
 654         ab8500_chargalg_usb_en(di, false, 0, 0);
 655         ab8500_chargalg_stop_safety_timer(di);
 656         ab8500_chargalg_stop_maintenance_timer(di);
 657         di->charge_status = POWER_SUPPLY_STATUS_NOT_CHARGING;
 658         di->maintenance_chg = false;
 659         cancel_delayed_work(&di->chargalg_wd_work);
 660         power_supply_changed(di->chargalg_psy);
 661 }
 662
 663 /**
 664  * ab8500_chargalg_hold_charging() - Pauses charging
 665  * @di:         pointer to the ab8500_chargalg structure
 666  *
 667  * This function is called in the case where maintenance charging has been
 668  * disabled and instead a battery voltage mode is entered to check when the
 669  * battery voltage has reached a certain recharge voltage
 670  */
 671 static void ab8500_chargalg_hold_charging(struct ab8500_chargalg *di)
 672 {
 673         ab8500_chargalg_ac_en(di, false, 0, 0);
 674         ab8500_chargalg_usb_en(di, false, 0, 0);
 675         ab8500_chargalg_stop_safety_timer(di);
 676         ab8500_chargalg_stop_maintenance_timer(di);
 677         di->charge_status = POWER_SUPPLY_STATUS_CHARGING;
 678         di->maintenance_chg = false;
 679         cancel_delayed_work(&di->chargalg_wd_work);
 680         power_supply_changed(di->chargalg_psy);
 681 }
 682
 683 /**
 684  * ab8500_chargalg_start_charging() - Start the charger
 685  * @di:         pointer to the ab8500_chargalg structure
 686  * @vset:       requested charger output voltage
 687  * @iset:       requested charger output current
 688  *
 689  * A charger will be enabled depending on the requested charger type that was
 690  * detected previously.
 691  */
 692 static void ab8500_chargalg_start_charging(struct ab8500_chargalg *di,
 693         int vset, int iset)
 694 {
 695         switch (di->chg_info.charger_type) {
 696         case AC_CHG:
 697                 dev_dbg(di->dev,
 698                         "AC parameters: Vset %d, Ich %d\n", vset, iset);
 699                 ab8500_chargalg_usb_en(di, false, 0, 0);
 700                 ab8500_chargalg_ac_en(di, true, vset, iset);
 701                 break;
 702
 703         case USB_CHG:
 704                 dev_dbg(di->dev,
 705                         "USB parameters: Vset %d, Ich %d\n", vset, iset);
 706                 ab8500_chargalg_ac_en(di, false, 0, 0);
 707                 ab8500_chargalg_usb_en(di, true, vset, iset);
 708                 break;
 709
 710         default:
 711                 dev_err(di->dev, "Unknown charger to charge from\n");
 712                 break;
 713         }
 714 }
 715
 716 /**
 717  * ab8500_chargalg_check_temp() - Check battery temperature ranges
 718  * @di:         pointer to the ab8500_chargalg structure
 719  *
 720  * The battery temperature is checked against the predefined limits and the
 721  * charge state is changed accordingly
 722  */
 723 static void ab8500_chargalg_check_temp(struct ab8500_chargalg *di)
 724 {
 725         if (di->batt_data.temp > (di->bm->temp_low + di->t_hyst_norm) &&
 726                 di->batt_data.temp < (di->bm->temp_high - di->t_hyst_norm)) {
 727                 /* Temp OK! */
 728                 di->events.btemp_underover = false;
 729                 di->events.btemp_lowhigh = false;
 730                 di->t_hyst_norm = 0;
 731                 di->t_hyst_lowhigh = 0;
 732         } else {
 733                 if (((di->batt_data.temp >= di->bm->temp_high) &&
 734                         (di->batt_data.temp <
 735                                 (di->bm->temp_over - di->t_hyst_lowhigh))) ||
 736                         ((di->batt_data.temp >
 737                                 (di->bm->temp_under + di->t_hyst_lowhigh)) &&
 738                         (di->batt_data.temp <= di->bm->temp_low))) {
 739                         /* TEMP minor!!!!! */
 740                         di->events.btemp_underover = false;
 741                         di->events.btemp_lowhigh = true;
 742                         di->t_hyst_norm = di->bm->temp_hysteresis;
 743                         di->t_hyst_lowhigh = 0;
 744                 } else if (di->batt_data.temp <= di->bm->temp_under ||
 745                         di->batt_data.temp >= di->bm->temp_over) {
 746                         /* TEMP major!!!!! */
 747                         di->events.btemp_underover = true;
 748                         di->events.btemp_lowhigh = false;
 749                         di->t_hyst_norm = 0;
 750                         di->t_hyst_lowhigh = di->bm->temp_hysteresis;
 751                 } else {
 752                         /* Within hysteresis */
 753                         dev_dbg(di->dev, "Within hysteresis limit temp: %d "
 754                                 "hyst_lowhigh %d, hyst normal %d\n",
 755                                 di->batt_data.temp, di->t_hyst_lowhigh,
 756                                 di->t_hyst_norm);
 757                 }
 758         }
 759 }
 760
 761 /**
 762  * ab8500_chargalg_check_charger_voltage() - Check charger voltage
 763  * @di:         pointer to the ab8500_chargalg structure
 764  *
 765  * Charger voltage is checked against maximum limit
 766  */
 767 static void ab8500_chargalg_check_charger_voltage(struct ab8500_chargalg *di)
 768 {
 769         if (di->chg_info.usb_volt > di->bm->chg_params->usb_volt_max)
 770                 di->chg_info.usb_chg_ok = false;
 771         else
 772                 di->chg_info.usb_chg_ok = true;
 773
 774         if (di->chg_info.ac_volt > di->bm->chg_params->ac_volt_max)
 775                 di->chg_info.ac_chg_ok = false;
 776         else
 777                 di->chg_info.ac_chg_ok = true;
 778
 779 }
 780
 781 /**
 782  * ab8500_chargalg_end_of_charge() - Check if end-of-charge criteria is fulfilled
 783  * @di:         pointer to the ab8500_chargalg structure
 784  *
 785  * End-of-charge criteria is fulfilled when the battery voltage is above a
 786  * certain limit and the battery current is below a certain limit for a
 787  * predefined number of consecutive seconds. If true, the battery is full
 788  */
 789 static void ab8500_chargalg_end_of_charge(struct ab8500_chargalg *di)
 790 {
 791         if (di->charge_status == POWER_SUPPLY_STATUS_CHARGING &&
 792                 di->charge_state == STATE_NORMAL &&
 793                 !di->maintenance_chg && (di->batt_data.volt >=
 794                 di->bm->bat_type[di->bm->batt_id].termination_vol ||
 795                 di->events.usb_cv_active || di->events.ac_cv_active) &&
 796                 di->batt_data.avg_curr <
 797                 di->bm->bat_type[di->bm->batt_id].termination_curr &&
 798                 di->batt_data.avg_curr > 0) {
 799                 if (++di->eoc_cnt >= EOC_COND_CNT) {
 800                         di->eoc_cnt = 0;
 801                         di->charge_status = POWER_SUPPLY_STATUS_FULL;
 802                         di->maintenance_chg = true;
 803                         dev_dbg(di->dev, "EOC reached!\n");
 804                         power_supply_changed(di->chargalg_psy);
 805                 } else {
 806                         dev_dbg(di->dev,
 807                                 " EOC limit reached for the %d"
 808                                 " time, out of %d before EOC\n",
 809                                 di->eoc_cnt,
 810                                 EOC_COND_CNT);
 811                 }
 812         } else {
 813                 di->eoc_cnt = 0;
 814         }
 815 }
 816
 817 static void init_maxim_chg_curr(struct ab8500_chargalg *di)
 818 {
 819         di->ccm.original_iset =
 820                 di->bm->bat_type[di->bm->batt_id].normal_cur_lvl;
 821         di->ccm.current_iset =
 822                 di->bm->bat_type[di->bm->batt_id].normal_cur_lvl;
 823         di->ccm.test_delta_i = di->bm->maxi->charger_curr_step;
 824         di->ccm.max_current = di->bm->maxi->chg_curr;
 825         di->ccm.condition_cnt = di->bm->maxi->wait_cycles;
 826         di->ccm.level = 0;
 827 }
 828
 829 /**
 830  * ab8500_chargalg_chg_curr_maxim - increases the charger current to
 831  *                      compensate for the system load
 832  * @di          pointer to the ab8500_chargalg structure
 833  *
 834  * This maximization function is used to raise the charger current to get the
 835  * battery current as close to the optimal value as possible. The battery
 836  * current during charging is affected by the system load
 837  */
 838 static enum maxim_ret ab8500_chargalg_chg_curr_maxim(struct ab8500_chargalg *di)
 839 {
 840         int delta_i;
 841
 842         if (!di->bm->maxi->ena_maxi)
 843                 return MAXIM_RET_NOACTION;
 844
 845         delta_i = di->ccm.original_iset - di->batt_data.inst_curr;
 846
 847         if (di->events.vbus_collapsed) {
 848                 dev_dbg(di->dev, "Charger voltage has collapsed %d\n",
 849                                 di->ccm.wait_cnt);
 850                 if (di->ccm.wait_cnt == 0) {
 851                         dev_dbg(di->dev, "lowering current\n");
 852                         di->ccm.wait_cnt++;
 853                         di->ccm.condition_cnt = di->bm->maxi->wait_cycles;
 854                         di->ccm.max_current =
 855                                 di->ccm.current_iset - di->ccm.test_delta_i;
 856                         di->ccm.current_iset = di->ccm.max_current;
 857                         di->ccm.level--;
 858                         return MAXIM_RET_CHANGE;
 859                 } else {
 860                         dev_dbg(di->dev, "waiting\n");
 861                         /* Let's go in here twice before lowering curr again */
 862                         di->ccm.wait_cnt = (di->ccm.wait_cnt + 1) % 3;
 863                         return MAXIM_RET_NOACTION;
 864                 }
 865         }
 866
 867         di->ccm.wait_cnt = 0;
 868
 869         if (di->batt_data.inst_curr > di->ccm.original_iset) {
 870                 dev_dbg(di->dev, " Maximization Ibat (%dmA) too high"
 871                         " (limit %dmA) (current iset: %dmA)!\n",
 872                         di->batt_data.inst_curr, di->ccm.original_iset,
 873                         di->ccm.current_iset);
 874
 875                 if (di->ccm.current_iset == di->ccm.original_iset)
 876                         return MAXIM_RET_NOACTION;
 877
 878                 di->ccm.condition_cnt = di->bm->maxi->wait_cycles;
 879                 di->ccm.current_iset = di->ccm.original_iset;
 880                 di->ccm.level = 0;
 881
 882                 return MAXIM_RET_IBAT_TOO_HIGH;
 883         }
 884
 885         if (delta_i > di->ccm.test_delta_i &&
 886                 (di->ccm.current_iset + di->ccm.test_delta_i) <
 887                 di->ccm.max_current) {
 888                 if (di->ccm.condition_cnt-- == 0) {
 889                         /* Increse the iset with cco.test_delta_i */
 890                         di->ccm.condition_cnt = di->bm->maxi->wait_cycles;
 891                         di->ccm.current_iset += di->ccm.test_delta_i;
 892                         di->ccm.level++;
 893                         dev_dbg(di->dev, " Maximization needed, increase"
 894                                 " with %d mA to %dmA (Optimal ibat: %d)"
 895                                 " Level %d\n",
 896                                 di->ccm.test_delta_i,
 897                                 di->ccm.current_iset,
 898                                 di->ccm.original_iset,
 899                                 di->ccm.level);
 900                         return MAXIM_RET_CHANGE;
 901                 } else {
 902                         return MAXIM_RET_NOACTION;
 903                 }
 904         }  else {
 905                 di->ccm.condition_cnt = di->bm->maxi->wait_cycles;
 906                 return MAXIM_RET_NOACTION;
 907         }
 908 }
 909
 910 static void handle_maxim_chg_curr(struct ab8500_chargalg *di)
 911 {
 912         enum maxim_ret ret;
 913         int result;
 914
 915         ret = ab8500_chargalg_chg_curr_maxim(di);
 916         switch (ret) {
 917         case MAXIM_RET_CHANGE:
 918                 result = ab8500_chargalg_update_chg_curr(di,
 919                         di->ccm.current_iset);
 920                 if (result)
 921                         dev_err(di->dev, "failed to set chg curr\n");
 922                 break;
 923         case MAXIM_RET_IBAT_TOO_HIGH:
 924                 result = ab8500_chargalg_update_chg_curr(di,
 925                         di->bm->bat_type[di->bm->batt_id].normal_cur_lvl);
 926                 if (result)
 927                         dev_err(di->dev, "failed to set chg curr\n");
 928                 break;
 929
 930         case MAXIM_RET_NOACTION:
 931         default:
 932                 /* Do nothing..*/
 933                 break;
 934         }
 935 }
 936
 937 static int ab8500_chargalg_get_ext_psy_data(struct device *dev, void *data)
 938 {
 939         struct power_supply *psy;
 940         struct power_supply *ext = dev_get_drvdata(dev);
 941         const char **supplicants = (const char **)ext->supplied_to;
 942         struct ab8500_chargalg *di;
 943         union power_supply_propval ret;
 944         int j;
 945         bool capacity_updated = false;
 946
 947         psy = (struct power_supply *)data;
 948         di = power_supply_get_drvdata(psy);
 949         /* For all psy where the driver name appears in any supplied_to */
 950         j = match_string(supplicants, ext->num_supplicants, psy->desc->name);
 951         if (j < 0)
 952                 return 0;
 953
 954         /*
 955          *  If external is not registering 'POWER_SUPPLY_PROP_CAPACITY' to its
 956          * property because of handling that sysfs entry on its own, this is
 957          * the place to get the battery capacity.
 958          */
 959         if (!power_supply_get_property(ext, POWER_SUPPLY_PROP_CAPACITY, &ret)) {
 960                 di->batt_data.percent = ret.intval;
 961                 capacity_updated = true;
 962         }
 963
 964         /* Go through all properties for the psy */
 965         for (j = 0; j < ext->desc->num_properties; j++) {
 966                 enum power_supply_property prop;
 967                 prop = ext->desc->properties[j];
 968
 969                 /*
 970                  * Initialize chargers if not already done.
 971                  * The ab8500_charger*/
 972                 if (!di->ac_chg &&
 973                         ext->desc->type == POWER_SUPPLY_TYPE_MAINS)
 974                         di->ac_chg = psy_to_ux500_charger(ext);
 975                 else if (!di->usb_chg &&
 976                         ext->desc->type == POWER_SUPPLY_TYPE_USB)
 977                         di->usb_chg = psy_to_ux500_charger(ext);
 978
 979                 if (power_supply_get_property(ext, prop, &ret))
 980                         continue;
 981                 switch (prop) {
 982                 case POWER_SUPPLY_PROP_PRESENT:
 983                         switch (ext->desc->type) {
 984                         case POWER_SUPPLY_TYPE_BATTERY:
 985                                 /* Battery present */
 986                                 if (ret.intval)
 987                                         di->events.batt_rem = false;
 988                                 /* Battery removed */
 989                                 else
 990                                         di->events.batt_rem = true;
 991                                 break;
 992                         case POWER_SUPPLY_TYPE_MAINS:
 993                                 /* AC disconnected */
 994                                 if (!ret.intval &&
 995                                         (di->chg_info.conn_chg & AC_CHG)) {
 996                                         di->chg_info.prev_conn_chg =
 997                                                 di->chg_info.conn_chg;
 998                                         di->chg_info.conn_chg &= ~AC_CHG;
 999                                 }
1000                                 /* AC connected */
1001                                 else if (ret.intval &&
1002                                         !(di->chg_info.conn_chg & AC_CHG)) {
1003                                         di->chg_info.prev_conn_chg =
1004                                                 di->chg_info.conn_chg;
1005                                         di->chg_info.conn_chg |= AC_CHG;
1006                                 }
1007                                 break;
1008                         case POWER_SUPPLY_TYPE_USB:
1009                                 /* USB disconnected */
1010                                 if (!ret.intval &&
1011                                         (di->chg_info.conn_chg & USB_CHG)) {
1012                                         di->chg_info.prev_conn_chg =
1013                                                 di->chg_info.conn_chg;
1014                                         di->chg_info.conn_chg &= ~USB_CHG;
1015                                 }
1016                                 /* USB connected */
1017                                 else if (ret.intval &&
1018                                         !(di->chg_info.conn_chg & USB_CHG)) {
1019                                         di->chg_info.prev_conn_chg =
1020                                                 di->chg_info.conn_chg;
1021                                         di->chg_info.conn_chg |= USB_CHG;
1022                                 }
1023                                 break;
1024                         default:
1025                                 break;
1026                         }
1027                         break;
1028
1029                 case POWER_SUPPLY_PROP_ONLINE:
1030                         switch (ext->desc->type) {
1031                         case POWER_SUPPLY_TYPE_BATTERY:
1032                                 break;
1033                         case POWER_SUPPLY_TYPE_MAINS:
1034                                 /* AC offline */
1035                                 if (!ret.intval &&
1036                                         (di->chg_info.online_chg & AC_CHG)) {
1037                                         di->chg_info.prev_online_chg =
1038                                                 di->chg_info.online_chg;
1039                                         di->chg_info.online_chg &= ~AC_CHG;
1040                                 }
1041                                 /* AC online */
1042                                 else if (ret.intval &&
1043                                         !(di->chg_info.online_chg & AC_CHG)) {
1044                                         di->chg_info.prev_online_chg =
1045                                                 di->chg_info.online_chg;
1046                                         di->chg_info.online_chg |= AC_CHG;
1047                                         queue_delayed_work(di->chargalg_wq,
1048                                                 &di->chargalg_wd_work, 0);
1049                                 }
1050                                 break;
1051                         case POWER_SUPPLY_TYPE_USB:
1052                                 /* USB offline */
1053                                 if (!ret.intval &&
1054                                         (di->chg_info.online_chg & USB_CHG)) {
1055                                         di->chg_info.prev_online_chg =
1056                                                 di->chg_info.online_chg;
1057                                         di->chg_info.online_chg &= ~USB_CHG;
1058                                 }
1059                                 /* USB online */
1060                                 else if (ret.intval &&
1061                                         !(di->chg_info.online_chg & USB_CHG)) {
1062                                         di->chg_info.prev_online_chg =
1063                                                 di->chg_info.online_chg;
1064                                         di->chg_info.online_chg |= USB_CHG;
1065                                         queue_delayed_work(di->chargalg_wq,
1066                                                 &di->chargalg_wd_work, 0);
1067                                 }
1068                                 break;
1069                         default:
1070                                 break;
1071                         }
1072                         break;
1073
1074                 case POWER_SUPPLY_PROP_HEALTH:
1075                         switch (ext->desc->type) {
1076                         case POWER_SUPPLY_TYPE_BATTERY:
1077                                 break;
1078                         case POWER_SUPPLY_TYPE_MAINS:
1079                                 switch (ret.intval) {
1080                                 case POWER_SUPPLY_HEALTH_UNSPEC_FAILURE:
1081                                         di->events.mainextchnotok = true;
1082                                         di->events.main_thermal_prot = false;
1083                                         di->events.main_ovv = false;
1084                                         di->events.ac_wd_expired = false;
1085                                         break;
1086                                 case POWER_SUPPLY_HEALTH_DEAD:
1087                                         di->events.ac_wd_expired = true;
1088                                         di->events.mainextchnotok = false;
1089                                         di->events.main_ovv = false;
1090                                         di->events.main_thermal_prot = false;
1091                                         break;
1092                                 case POWER_SUPPLY_HEALTH_COLD:
1093                                 case POWER_SUPPLY_HEALTH_OVERHEAT:
1094                                         di->events.main_thermal_prot = true;
1095                                         di->events.mainextchnotok = false;
1096                                         di->events.main_ovv = false;
1097                                         di->events.ac_wd_expired = false;
1098                                         break;
1099                                 case POWER_SUPPLY_HEALTH_OVERVOLTAGE:
1100                                         di->events.main_ovv = true;
1101                                         di->events.mainextchnotok = false;
1102                                         di->events.main_thermal_prot = false;
1103                                         di->events.ac_wd_expired = false;
1104                                         break;
1105                                 case POWER_SUPPLY_HEALTH_GOOD:
1106                                         di->events.main_thermal_prot = false;
1107                                         di->events.mainextchnotok = false;
1108                                         di->events.main_ovv = false;
1109                                         di->events.ac_wd_expired = false;
1110                                         break;
1111                                 default:
1112                                         break;
1113                                 }
1114                                 break;
1115
1116                         case POWER_SUPPLY_TYPE_USB:
1117                                 switch (ret.intval) {
1118                                 case POWER_SUPPLY_HEALTH_UNSPEC_FAILURE:
1119                                         di->events.usbchargernotok = true;
1120                                         di->events.usb_thermal_prot = false;
1121                                         di->events.vbus_ovv = false;
1122                                         di->events.usb_wd_expired = false;
1123                                         break;
1124                                 case POWER_SUPPLY_HEALTH_DEAD:
1125                                         di->events.usb_wd_expired = true;
1126                                         di->events.usbchargernotok = false;
1127                                         di->events.usb_thermal_prot = false;
1128                                         di->events.vbus_ovv = false;
1129                                         break;
1130                                 case POWER_SUPPLY_HEALTH_COLD:
1131                                 case POWER_SUPPLY_HEALTH_OVERHEAT:
1132                                         di->events.usb_thermal_prot = true;
1133                                         di->events.usbchargernotok = false;
1134                                         di->events.vbus_ovv = false;
1135                                         di->events.usb_wd_expired = false;
1136                                         break;
1137                                 case POWER_SUPPLY_HEALTH_OVERVOLTAGE:
1138                                         di->events.vbus_ovv = true;
1139                                         di->events.usbchargernotok = false;
1140                                         di->events.usb_thermal_prot = false;
1141                                         di->events.usb_wd_expired = false;
1142                                         break;
1143                                 case POWER_SUPPLY_HEALTH_GOOD:
1144                                         di->events.usbchargernotok = false;
1145                                         di->events.usb_thermal_prot = false;
1146                                         di->events.vbus_ovv = false;
1147                                         di->events.usb_wd_expired = false;
1148                                         break;
1149                                 default:
1150                                         break;
1151                                 }
1152                                 break;
1153                         default:
1154                                 break;
1155                         }
1156                         break;
1157
1158                 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
1159                         switch (ext->desc->type) {
1160                         case POWER_SUPPLY_TYPE_BATTERY:
1161                                 di->batt_data.volt = ret.intval / 1000;
1162                                 break;
1163                         case POWER_SUPPLY_TYPE_MAINS:
1164                                 di->chg_info.ac_volt = ret.intval / 1000;
1165                                 break;
1166                         case POWER_SUPPLY_TYPE_USB:
1167                                 di->chg_info.usb_volt = ret.intval / 1000;
1168                                 break;
1169                         default:
1170                                 break;
1171                         }
1172                         break;
1173
1174                 case POWER_SUPPLY_PROP_VOLTAGE_AVG:
1175                         switch (ext->desc->type) {
1176                         case POWER_SUPPLY_TYPE_MAINS:
1177                                 /* AVG is used to indicate when we are
1178                                  * in CV mode */
1179                                 if (ret.intval)
1180                                         di->events.ac_cv_active = true;
1181                                 else
1182                                         di->events.ac_cv_active = false;
1183
1184                                 break;
1185                         case POWER_SUPPLY_TYPE_USB:
1186                                 /* AVG is used to indicate when we are
1187                                  * in CV mode */
1188                                 if (ret.intval)
1189                                         di->events.usb_cv_active = true;
1190                                 else
1191                                         di->events.usb_cv_active = false;
1192
1193                                 break;
1194                         default:
1195                                 break;
1196                         }
1197                         break;
1198
1199                 case POWER_SUPPLY_PROP_TECHNOLOGY:
1200                         switch (ext->desc->type) {
1201                         case POWER_SUPPLY_TYPE_BATTERY:
1202                                 if (ret.intval)
1203                                         di->events.batt_unknown = false;
1204                                 else
1205                                         di->events.batt_unknown = true;
1206
1207                                 break;
1208                         default:
1209                                 break;
1210                         }
1211                         break;
1212
1213                 case POWER_SUPPLY_PROP_TEMP:
1214                         di->batt_data.temp = ret.intval / 10;
1215                         break;
1216
1217                 case POWER_SUPPLY_PROP_CURRENT_NOW:
1218                         switch (ext->desc->type) {
1219                         case POWER_SUPPLY_TYPE_MAINS:
1220                                         di->chg_info.ac_curr =
1221                                                 ret.intval / 1000;
1222                                         break;
1223                         case POWER_SUPPLY_TYPE_USB:
1224                                         di->chg_info.usb_curr =
1225                                                 ret.intval / 1000;
1226                                 break;
1227                         case POWER_SUPPLY_TYPE_BATTERY:
1228                                 di->batt_data.inst_curr = ret.intval / 1000;
1229                                 break;
1230                         default:
1231                                 break;
1232                         }
1233                         break;
1234
1235                 case POWER_SUPPLY_PROP_CURRENT_AVG:
1236                         switch (ext->desc->type) {
1237                         case POWER_SUPPLY_TYPE_BATTERY:
1238                                 di->batt_data.avg_curr = ret.intval / 1000;
1239                                 break;
1240                         case POWER_SUPPLY_TYPE_USB:
1241                                 if (ret.intval)
1242                                         di->events.vbus_collapsed = true;
1243                                 else
1244                                         di->events.vbus_collapsed = false;
1245                                 break;
1246                         default:
1247                                 break;
1248                         }
1249                         break;
1250                 case POWER_SUPPLY_PROP_CAPACITY:
1251                         if (!capacity_updated)
1252                                 di->batt_data.percent = ret.intval;
1253                         break;
1254                 default:
1255                         break;
1256                 }
1257         }
1258         return 0;
1259 }
1260
1261 /**
1262  * ab8500_chargalg_external_power_changed() - callback for power supply changes
1263  * @psy:       pointer to the structure power_supply
1264  *
1265  * This function is the entry point of the pointer external_power_changed
1266  * of the structure power_supply.
1267  * This function gets executed when there is a change in any external power
1268  * supply that this driver needs to be notified of.
1269  */
1270 static void ab8500_chargalg_external_power_changed(struct power_supply *psy)
1271 {
1272         struct ab8500_chargalg *di = power_supply_get_drvdata(psy);
1273
1274         /*
1275          * Trigger execution of the algorithm instantly and read
1276          * all power_supply properties there instead
1277          */
1278         if (di->chargalg_wq)
1279                 queue_work(di->chargalg_wq, &di->chargalg_work);
1280 }
1281
1282 /**
1283  * ab8500_chargalg_algorithm() - Main function for the algorithm
1284  * @di:         pointer to the ab8500_chargalg structure
1285  *
1286  * This is the main control function for the charging algorithm.
1287  * It is called periodically or when something happens that will
1288  * trigger a state change
1289  */
1290 static void ab8500_chargalg_algorithm(struct ab8500_chargalg *di)
1291 {
1292         int charger_status;
1293         int ret;
1294         int curr_step_lvl;
1295
1296         /* Collect data from all power_supply class devices */
1297         class_for_each_device(power_supply_class, NULL,
1298                 di->chargalg_psy, ab8500_chargalg_get_ext_psy_data);
1299
1300         ab8500_chargalg_end_of_charge(di);
1301         ab8500_chargalg_check_temp(di);
1302         ab8500_chargalg_check_charger_voltage(di);
1303
1304         charger_status = ab8500_chargalg_check_charger_connection(di);
1305         ab8500_chargalg_check_current_step_status(di);
1306
1307         if (is_ab8500(di->parent)) {
1308                 ret = ab8500_chargalg_check_charger_enable(di);
1309                 if (ret < 0)
1310                         dev_err(di->dev, "Checking charger is enabled error"
1311                                         ": Returned Value %d\n", ret);
1312         }
1313
1314         /*
1315          * First check if we have a charger connected.
1316          * Also we don't allow charging of unknown batteries if configured
1317          * this way
1318          */
1319         if (!charger_status ||
1320                 (di->events.batt_unknown && !di->bm->chg_unknown_bat)) {
1321                 if (di->charge_state != STATE_HANDHELD) {
1322                         di->events.safety_timer_expired = false;
1323                         ab8500_chargalg_state_to(di, STATE_HANDHELD_INIT);
1324                 }
1325         }
1326
1327         /* If suspended, we should not continue checking the flags */
1328         else if (di->charge_state == STATE_SUSPENDED_INIT ||
1329                 di->charge_state == STATE_SUSPENDED) {
1330                 /* We don't do anything here, just don,t continue */
1331         }
1332
1333         /* Safety timer expiration */
1334         else if (di->events.safety_timer_expired) {
1335                 if (di->charge_state != STATE_SAFETY_TIMER_EXPIRED)
1336                         ab8500_chargalg_state_to(di,
1337                                 STATE_SAFETY_TIMER_EXPIRED_INIT);
1338         }
1339         /*
1340          * Check if any interrupts has occured
1341          * that will prevent us from charging
1342          */
1343
1344         /* Battery removed */
1345         else if (di->events.batt_rem) {
1346                 if (di->charge_state != STATE_BATT_REMOVED)
1347                         ab8500_chargalg_state_to(di, STATE_BATT_REMOVED_INIT);
1348         }
1349         /* Main or USB charger not ok. */
1350         else if (di->events.mainextchnotok || di->events.usbchargernotok) {
1351                 /*
1352                  * If vbus_collapsed is set, we have to lower the charger
1353                  * current, which is done in the normal state below
1354                  */
1355                 if (di->charge_state != STATE_CHG_NOT_OK &&
1356                                 !di->events.vbus_collapsed)
1357                         ab8500_chargalg_state_to(di, STATE_CHG_NOT_OK_INIT);
1358         }
1359         /* VBUS, Main or VBAT OVV. */
1360         else if (di->events.vbus_ovv ||
1361                         di->events.main_ovv ||
1362                         di->events.batt_ovv ||
1363                         !di->chg_info.usb_chg_ok ||
1364                         !di->chg_info.ac_chg_ok) {
1365                 if (di->charge_state != STATE_OVV_PROTECT)
1366                         ab8500_chargalg_state_to(di, STATE_OVV_PROTECT_INIT);
1367         }
1368         /* USB Thermal, stop charging */
1369         else if (di->events.main_thermal_prot ||
1370                 di->events.usb_thermal_prot) {
1371                 if (di->charge_state != STATE_HW_TEMP_PROTECT)
1372                         ab8500_chargalg_state_to(di,
1373                                 STATE_HW_TEMP_PROTECT_INIT);
1374         }
1375         /* Battery temp over/under */
1376         else if (di->events.btemp_underover) {
1377                 if (di->charge_state != STATE_TEMP_UNDEROVER)
1378                         ab8500_chargalg_state_to(di,
1379                                 STATE_TEMP_UNDEROVER_INIT);
1380         }
1381         /* Watchdog expired */
1382         else if (di->events.ac_wd_expired ||
1383                 di->events.usb_wd_expired) {
1384                 if (di->charge_state != STATE_WD_EXPIRED)
1385                         ab8500_chargalg_state_to(di, STATE_WD_EXPIRED_INIT);
1386         }
1387         /* Battery temp high/low */
1388         else if (di->events.btemp_lowhigh) {
1389                 if (di->charge_state != STATE_TEMP_LOWHIGH)
1390                         ab8500_chargalg_state_to(di, STATE_TEMP_LOWHIGH_INIT);
1391         }
1392
1393         dev_dbg(di->dev,
1394                 "[CHARGALG] Vb %d Ib_avg %d Ib_inst %d Tb %d Cap %d Maint %d "
1395                 "State %s Active_chg %d Chg_status %d AC %d USB %d "
1396                 "AC_online %d USB_online %d AC_CV %d USB_CV %d AC_I %d "
1397                 "USB_I %d AC_Vset %d AC_Iset %d USB_Vset %d USB_Iset %d\n",
1398                 di->batt_data.volt,
1399                 di->batt_data.avg_curr,
1400                 di->batt_data.inst_curr,
1401                 di->batt_data.temp,
1402                 di->batt_data.percent,
1403                 di->maintenance_chg,
1404                 states[di->charge_state],
1405                 di->chg_info.charger_type,
1406                 di->charge_status,
1407                 di->chg_info.conn_chg & AC_CHG,
1408                 di->chg_info.conn_chg & USB_CHG,
1409                 di->chg_info.online_chg & AC_CHG,
1410                 di->chg_info.online_chg & USB_CHG,
1411                 di->events.ac_cv_active,
1412                 di->events.usb_cv_active,
1413                 di->chg_info.ac_curr,
1414                 di->chg_info.usb_curr,
1415                 di->chg_info.ac_vset,
1416                 di->chg_info.ac_iset,
1417                 di->chg_info.usb_vset,
1418                 di->chg_info.usb_iset);
1419
1420         switch (di->charge_state) {
1421         case STATE_HANDHELD_INIT:
1422                 ab8500_chargalg_stop_charging(di);
1423                 di->charge_status = POWER_SUPPLY_STATUS_DISCHARGING;
1424                 ab8500_chargalg_state_to(di, STATE_HANDHELD);
1425                 fallthrough;
1426
1427         case STATE_HANDHELD:
1428                 break;
1429
1430         case STATE_SUSPENDED_INIT:
1431                 if (di->susp_status.ac_suspended)
1432                         ab8500_chargalg_ac_en(di, false, 0, 0);
1433                 if (di->susp_status.usb_suspended)
1434                         ab8500_chargalg_usb_en(di, false, 0, 0);
1435                 ab8500_chargalg_stop_safety_timer(di);
1436                 ab8500_chargalg_stop_maintenance_timer(di);
1437                 di->charge_status = POWER_SUPPLY_STATUS_NOT_CHARGING;
1438                 di->maintenance_chg = false;
1439                 ab8500_chargalg_state_to(di, STATE_SUSPENDED);
1440                 power_supply_changed(di->chargalg_psy);
1441                 fallthrough;
1442
1443         case STATE_SUSPENDED:
1444                 /* CHARGING is suspended */
1445                 break;
1446
1447         case STATE_BATT_REMOVED_INIT:
1448                 ab8500_chargalg_stop_charging(di);
1449                 ab8500_chargalg_state_to(di, STATE_BATT_REMOVED);
1450                 fallthrough;
1451
1452         case STATE_BATT_REMOVED:
1453                 if (!di->events.batt_rem)
1454                         ab8500_chargalg_state_to(di, STATE_NORMAL_INIT);
1455                 break;
1456
1457         case STATE_HW_TEMP_PROTECT_INIT:
1458                 ab8500_chargalg_stop_charging(di);
1459                 ab8500_chargalg_state_to(di, STATE_HW_TEMP_PROTECT);
1460                 fallthrough;
1461
1462         case STATE_HW_TEMP_PROTECT:
1463                 if (!di->events.main_thermal_prot &&
1464                                 !di->events.usb_thermal_prot)
1465                         ab8500_chargalg_state_to(di, STATE_NORMAL_INIT);
1466                 break;
1467
1468         case STATE_OVV_PROTECT_INIT:
1469                 ab8500_chargalg_stop_charging(di);
1470                 ab8500_chargalg_state_to(di, STATE_OVV_PROTECT);
1471                 fallthrough;
1472
1473         case STATE_OVV_PROTECT:
1474                 if (!di->events.vbus_ovv &&
1475                                 !di->events.main_ovv &&
1476                                 !di->events.batt_ovv &&
1477                                 di->chg_info.usb_chg_ok &&
1478                                 di->chg_info.ac_chg_ok)
1479                         ab8500_chargalg_state_to(di, STATE_NORMAL_INIT);
1480                 break;
1481
1482         case STATE_CHG_NOT_OK_INIT:
1483                 ab8500_chargalg_stop_charging(di);
1484                 ab8500_chargalg_state_to(di, STATE_CHG_NOT_OK);
1485                 fallthrough;
1486
1487         case STATE_CHG_NOT_OK:
1488                 if (!di->events.mainextchnotok &&
1489                                 !di->events.usbchargernotok)
1490                         ab8500_chargalg_state_to(di, STATE_NORMAL_INIT);
1491                 break;
1492
1493         case STATE_SAFETY_TIMER_EXPIRED_INIT:
1494                 ab8500_chargalg_stop_charging(di);
1495                 ab8500_chargalg_state_to(di, STATE_SAFETY_TIMER_EXPIRED);
1496                 fallthrough;
1497
1498         case STATE_SAFETY_TIMER_EXPIRED:
1499                 /* We exit this state when charger is removed */
1500                 break;
1501
1502         case STATE_NORMAL_INIT:
1503                 if (di->curr_status.curr_step == CHARGALG_CURR_STEP_LOW)
1504                         ab8500_chargalg_stop_charging(di);
1505                 else {
1506                         curr_step_lvl = di->bm->bat_type[
1507                                 di->bm->batt_id].normal_cur_lvl
1508                                 * di->curr_status.curr_step
1509                                 / CHARGALG_CURR_STEP_HIGH;
1510                         ab8500_chargalg_start_charging(di,
1511                                 di->bm->bat_type[di->bm->batt_id]
1512                                 .normal_vol_lvl, curr_step_lvl);
1513                 }
1514
1515                 ab8500_chargalg_state_to(di, STATE_NORMAL);
1516                 ab8500_chargalg_start_safety_timer(di);
1517                 ab8500_chargalg_stop_maintenance_timer(di);
1518                 init_maxim_chg_curr(di);
1519                 di->charge_status = POWER_SUPPLY_STATUS_CHARGING;
1520                 di->eoc_cnt = 0;
1521                 di->maintenance_chg = false;
1522                 power_supply_changed(di->chargalg_psy);
1523
1524                 break;
1525
1526         case STATE_NORMAL:
1527                 handle_maxim_chg_curr(di);
1528                 if (di->charge_status == POWER_SUPPLY_STATUS_FULL &&
1529                         di->maintenance_chg) {
1530                         if (di->bm->no_maintenance)
1531                                 ab8500_chargalg_state_to(di,
1532                                         STATE_WAIT_FOR_RECHARGE_INIT);
1533                         else
1534                                 ab8500_chargalg_state_to(di,
1535                                         STATE_MAINTENANCE_A_INIT);
1536                 }
1537                 break;
1538
1539         /* This state will be used when the maintenance state is disabled */
1540         case STATE_WAIT_FOR_RECHARGE_INIT:
1541                 ab8500_chargalg_hold_charging(di);
1542                 ab8500_chargalg_state_to(di, STATE_WAIT_FOR_RECHARGE);
1543                 fallthrough;
1544
1545         case STATE_WAIT_FOR_RECHARGE:
1546                 if (di->batt_data.percent <=
1547                     di->bm->bat_type[di->bm->batt_id].recharge_cap)
1548                         ab8500_chargalg_state_to(di, STATE_NORMAL_INIT);
1549                 break;
1550
1551         case STATE_MAINTENANCE_A_INIT:
1552                 ab8500_chargalg_stop_safety_timer(di);
1553                 ab8500_chargalg_start_maintenance_timer(di,
1554                         di->bm->bat_type[
1555                                 di->bm->batt_id].maint_a_chg_timer_h);
1556                 ab8500_chargalg_start_charging(di,
1557                         di->bm->bat_type[
1558                                 di->bm->batt_id].maint_a_vol_lvl,
1559                         di->bm->bat_type[
1560                                 di->bm->batt_id].maint_a_cur_lvl);
1561                 ab8500_chargalg_state_to(di, STATE_MAINTENANCE_A);
1562                 power_supply_changed(di->chargalg_psy);
1563                 fallthrough;
1564
1565         case STATE_MAINTENANCE_A:
1566                 if (di->events.maintenance_timer_expired) {
1567                         ab8500_chargalg_stop_maintenance_timer(di);
1568                         ab8500_chargalg_state_to(di, STATE_MAINTENANCE_B_INIT);
1569                 }
1570                 break;
1571
1572         case STATE_MAINTENANCE_B_INIT:
1573                 ab8500_chargalg_start_maintenance_timer(di,
1574                         di->bm->bat_type[
1575                                 di->bm->batt_id].maint_b_chg_timer_h);
1576                 ab8500_chargalg_start_charging(di,
1577                         di->bm->bat_type[
1578                                 di->bm->batt_id].maint_b_vol_lvl,
1579                         di->bm->bat_type[
1580                                 di->bm->batt_id].maint_b_cur_lvl);
1581                 ab8500_chargalg_state_to(di, STATE_MAINTENANCE_B);
1582                 power_supply_changed(di->chargalg_psy);
1583                 fallthrough;
1584
1585         case STATE_MAINTENANCE_B:
1586                 if (di->events.maintenance_timer_expired) {
1587                         ab8500_chargalg_stop_maintenance_timer(di);
1588                         ab8500_chargalg_state_to(di, STATE_NORMAL_INIT);
1589                 }
1590                 break;
1591
1592         case STATE_TEMP_LOWHIGH_INIT:
1593                 ab8500_chargalg_start_charging(di,
1594                         di->bm->bat_type[
1595                                 di->bm->batt_id].low_high_vol_lvl,
1596                         di->bm->bat_type[
1597                                 di->bm->batt_id].low_high_cur_lvl);
1598                 ab8500_chargalg_stop_maintenance_timer(di);
1599                 di->charge_status = POWER_SUPPLY_STATUS_CHARGING;
1600                 ab8500_chargalg_state_to(di, STATE_TEMP_LOWHIGH);
1601                 power_supply_changed(di->chargalg_psy);
1602                 fallthrough;
1603
1604         case STATE_TEMP_LOWHIGH:
1605                 if (!di->events.btemp_lowhigh)
1606                         ab8500_chargalg_state_to(di, STATE_NORMAL_INIT);
1607                 break;
1608
1609         case STATE_WD_EXPIRED_INIT:
1610                 ab8500_chargalg_stop_charging(di);
1611                 ab8500_chargalg_state_to(di, STATE_WD_EXPIRED);
1612                 fallthrough;
1613
1614         case STATE_WD_EXPIRED:
1615                 if (!di->events.ac_wd_expired &&
1616                                 !di->events.usb_wd_expired)
1617                         ab8500_chargalg_state_to(di, STATE_NORMAL_INIT);
1618                 break;
1619
1620         case STATE_TEMP_UNDEROVER_INIT:
1621                 ab8500_chargalg_stop_charging(di);
1622                 ab8500_chargalg_state_to(di, STATE_TEMP_UNDEROVER);
1623                 fallthrough;
1624
1625         case STATE_TEMP_UNDEROVER:
1626                 if (!di->events.btemp_underover)
1627                         ab8500_chargalg_state_to(di, STATE_NORMAL_INIT);
1628                 break;
1629         }
1630
1631         /* Start charging directly if the new state is a charge state */
1632         if (di->charge_state == STATE_NORMAL_INIT ||
1633                         di->charge_state == STATE_MAINTENANCE_A_INIT ||
1634                         di->charge_state == STATE_MAINTENANCE_B_INIT)
1635                 queue_work(di->chargalg_wq, &di->chargalg_work);
1636 }
1637
1638 /**
1639  * ab8500_chargalg_periodic_work() - Periodic work for the algorithm
1640  * @work:       pointer to the work_struct structure
1641  *
1642  * Work queue function for the charging algorithm
1643  */
1644 static void ab8500_chargalg_periodic_work(struct work_struct *work)
1645 {
1646         struct ab8500_chargalg *di = container_of(work,
1647                 struct ab8500_chargalg, chargalg_periodic_work.work);
1648
1649         ab8500_chargalg_algorithm(di);
1650
1651         /*
1652          * If a charger is connected then the battery has to be monitored
1653          * frequently, else the work can be delayed.
1654          */
1655         if (di->chg_info.conn_chg)
1656                 queue_delayed_work(di->chargalg_wq,
1657                         &di->chargalg_periodic_work,
1658                         di->bm->interval_charging * HZ);
1659         else
1660                 queue_delayed_work(di->chargalg_wq,
1661                         &di->chargalg_periodic_work,
1662                         di->bm->interval_not_charging * HZ);
1663 }
1664
1665 /**
1666  * ab8500_chargalg_wd_work() - periodic work to kick the charger watchdog
1667  * @work:       pointer to the work_struct structure
1668  *
1669  * Work queue function for kicking the charger watchdog
1670  */
1671 static void ab8500_chargalg_wd_work(struct work_struct *work)
1672 {
1673         int ret;
1674         struct ab8500_chargalg *di = container_of(work,
1675                 struct ab8500_chargalg, chargalg_wd_work.work);
1676
1677         ret = ab8500_chargalg_kick_watchdog(di);
1678         if (ret < 0)
1679                 dev_err(di->dev, "failed to kick watchdog\n");
1680
1681         queue_delayed_work(di->chargalg_wq,
1682                 &di->chargalg_wd_work, CHG_WD_INTERVAL);
1683 }
1684
1685 /**
1686  * ab8500_chargalg_work() - Work to run the charging algorithm instantly
1687  * @work:       pointer to the work_struct structure
1688  *
1689  * Work queue function for calling the charging algorithm
1690  */
1691 static void ab8500_chargalg_work(struct work_struct *work)
1692 {
1693         struct ab8500_chargalg *di = container_of(work,
1694                 struct ab8500_chargalg, chargalg_work);
1695
1696         ab8500_chargalg_algorithm(di);
1697 }
1698
1699 /**
1700  * ab8500_chargalg_get_property() - get the chargalg properties
1701  * @psy:        pointer to the power_supply structure
1702  * @psp:        pointer to the power_supply_property structure
1703  * @val:        pointer to the power_supply_propval union
1704  *
1705  * This function gets called when an application tries to get the
1706  * chargalg properties by reading the sysfs files.
1707  * status:     charging/discharging/full/unknown
1708  * health:     health of the battery
1709  * Returns error code in case of failure else 0 on success
1710  */
1711 static int ab8500_chargalg_get_property(struct power_supply *psy,
1712         enum power_supply_property psp,
1713         union power_supply_propval *val)
1714 {
1715         struct ab8500_chargalg *di = power_supply_get_drvdata(psy);
1716
1717         switch (psp) {
1718         case POWER_SUPPLY_PROP_STATUS:
1719                 val->intval = di->charge_status;
1720                 break;
1721         case POWER_SUPPLY_PROP_HEALTH:
1722                 if (di->events.batt_ovv) {
1723                         val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
1724                 } else if (di->events.btemp_underover) {
1725                         if (di->batt_data.temp <= di->bm->temp_under)
1726                                 val->intval = POWER_SUPPLY_HEALTH_COLD;
1727                         else
1728                                 val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
1729                 } else if (di->charge_state == STATE_SAFETY_TIMER_EXPIRED ||
1730                            di->charge_state == STATE_SAFETY_TIMER_EXPIRED_INIT) {
1731                         val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
1732                 } else {
1733                         val->intval = POWER_SUPPLY_HEALTH_GOOD;
1734                 }
1735                 break;
1736         default:
1737                 return -EINVAL;
1738         }
1739         return 0;
1740 }
1741
1742 /* Exposure to the sysfs interface */
1743
1744 static ssize_t ab8500_chargalg_curr_step_show(struct ab8500_chargalg *di,
1745                                               char *buf)
1746 {
1747         return sprintf(buf, "%d\n", di->curr_status.curr_step);
1748 }
1749
1750 static ssize_t ab8500_chargalg_curr_step_store(struct ab8500_chargalg *di,
1751                                                const char *buf, size_t length)
1752 {
1753         long param;
1754         int ret;
1755
1756         ret = kstrtol(buf, 10, &param);
1757         if (ret < 0)
1758                 return ret;
1759
1760         di->curr_status.curr_step = param;
1761         if (di->curr_status.curr_step >= CHARGALG_CURR_STEP_LOW &&
1762                 di->curr_status.curr_step <= CHARGALG_CURR_STEP_HIGH) {
1763                 di->curr_status.curr_step_change = true;
1764                 queue_work(di->chargalg_wq, &di->chargalg_work);
1765         } else
1766                 dev_info(di->dev, "Wrong current step\n"
1767                         "Enter 0. Disable AC/USB Charging\n"
1768                         "1--100. Set AC/USB charging current step\n"
1769                         "100. Enable AC/USB Charging\n");
1770
1771         return strlen(buf);
1772 }
1773
1774
1775 static ssize_t ab8500_chargalg_en_show(struct ab8500_chargalg *di,
1776                                        char *buf)
1777 {
1778         return sprintf(buf, "%d\n",
1779                        di->susp_status.ac_suspended &&
1780                        di->susp_status.usb_suspended);
1781 }
1782
1783 static ssize_t ab8500_chargalg_en_store(struct ab8500_chargalg *di,
1784         const char *buf, size_t length)
1785 {
1786         long param;
1787         int ac_usb;
1788         int ret;
1789
1790         ret = kstrtol(buf, 10, &param);
1791         if (ret < 0)
1792                 return ret;
1793
1794         ac_usb = param;
1795         switch (ac_usb) {
1796         case 0:
1797                 /* Disable charging */
1798                 di->susp_status.ac_suspended = true;
1799                 di->susp_status.usb_suspended = true;
1800                 di->susp_status.suspended_change = true;
1801                 /* Trigger a state change */
1802                 queue_work(di->chargalg_wq,
1803                         &di->chargalg_work);
1804                 break;
1805         case 1:
1806                 /* Enable AC Charging */
1807                 di->susp_status.ac_suspended = false;
1808                 di->susp_status.suspended_change = true;
1809                 /* Trigger a state change */
1810                 queue_work(di->chargalg_wq,
1811                         &di->chargalg_work);
1812                 break;
1813         case 2:
1814                 /* Enable USB charging */
1815                 di->susp_status.usb_suspended = false;
1816                 di->susp_status.suspended_change = true;
1817                 /* Trigger a state change */
1818                 queue_work(di->chargalg_wq,
1819                         &di->chargalg_work);
1820                 break;
1821         default:
1822                 dev_info(di->dev, "Wrong input\n"
1823                         "Enter 0. Disable AC/USB Charging\n"
1824                         "1. Enable AC charging\n"
1825                         "2. Enable USB Charging\n");
1826         }
1827         return strlen(buf);
1828 }
1829
1830 static struct ab8500_chargalg_sysfs_entry ab8500_chargalg_en_charger =
1831         __ATTR(chargalg, 0644, ab8500_chargalg_en_show,
1832                                 ab8500_chargalg_en_store);
1833
1834 static struct ab8500_chargalg_sysfs_entry ab8500_chargalg_curr_step =
1835         __ATTR(chargalg_curr_step, 0644, ab8500_chargalg_curr_step_show,
1836                                         ab8500_chargalg_curr_step_store);
1837
1838 static ssize_t ab8500_chargalg_sysfs_show(struct kobject *kobj,
1839         struct attribute *attr, char *buf)
1840 {
1841         struct ab8500_chargalg_sysfs_entry *entry = container_of(attr,
1842                 struct ab8500_chargalg_sysfs_entry, attr);
1843
1844         struct ab8500_chargalg *di = container_of(kobj,
1845                 struct ab8500_chargalg, chargalg_kobject);
1846
1847         if (!entry->show)
1848                 return -EIO;
1849
1850         return entry->show(di, buf);
1851 }
1852
1853 static ssize_t ab8500_chargalg_sysfs_charger(struct kobject *kobj,
1854         struct attribute *attr, const char *buf, size_t length)
1855 {
1856         struct ab8500_chargalg_sysfs_entry *entry = container_of(attr,
1857                 struct ab8500_chargalg_sysfs_entry, attr);
1858
1859         struct ab8500_chargalg *di = container_of(kobj,
1860                 struct ab8500_chargalg, chargalg_kobject);
1861
1862         if (!entry->store)
1863                 return -EIO;
1864
1865         return entry->store(di, buf, length);
1866 }
1867
1868 static struct attribute *ab8500_chargalg_chg[] = {
1869         &ab8500_chargalg_en_charger.attr,
1870         &ab8500_chargalg_curr_step.attr,
1871         NULL,
1872 };
1873
1874 static const struct sysfs_ops ab8500_chargalg_sysfs_ops = {
1875         .show = ab8500_chargalg_sysfs_show,
1876         .store = ab8500_chargalg_sysfs_charger,
1877 };
1878
1879 static struct kobj_type ab8500_chargalg_ktype = {
1880         .sysfs_ops = &ab8500_chargalg_sysfs_ops,
1881         .default_attrs = ab8500_chargalg_chg,
1882 };
1883
1884 /**
1885  * ab8500_chargalg_sysfs_exit() - de-init of sysfs entry
1886  * @di:                pointer to the struct ab8500_chargalg
1887  *
1888  * This function removes the entry in sysfs.
1889  */
1890 static void ab8500_chargalg_sysfs_exit(struct ab8500_chargalg *di)
1891 {
1892         kobject_del(&di->chargalg_kobject);
1893 }
1894
1895 /**
1896  * ab8500_chargalg_sysfs_init() - init of sysfs entry
1897  * @di:                pointer to the struct ab8500_chargalg
1898  *
1899  * This function adds an entry in sysfs.
1900  * Returns error code in case of failure else 0(on success)
1901  */
1902 static int ab8500_chargalg_sysfs_init(struct ab8500_chargalg *di)
1903 {
1904         int ret = 0;
1905
1906         ret = kobject_init_and_add(&di->chargalg_kobject,
1907                 &ab8500_chargalg_ktype,
1908                 NULL, "ab8500_chargalg");
1909         if (ret < 0)
1910                 dev_err(di->dev, "failed to create sysfs entry\n");
1911
1912         return ret;
1913 }
1914 /* Exposure to the sysfs interface <<END>> */
1915
1916 static int __maybe_unused ab8500_chargalg_resume(struct device *dev)
1917 {
1918         struct ab8500_chargalg *di = dev_get_drvdata(dev);
1919
1920         /* Kick charger watchdog if charging (any charger online) */
1921         if (di->chg_info.online_chg)
1922                 queue_delayed_work(di->chargalg_wq, &di->chargalg_wd_work, 0);
1923
1924         /*
1925          * Run the charging algorithm directly to be sure we don't
1926          * do it too seldom
1927          */
1928         queue_delayed_work(di->chargalg_wq, &di->chargalg_periodic_work, 0);
1929
1930         return 0;
1931 }
1932
1933 static int __maybe_unused ab8500_chargalg_suspend(struct device *dev)
1934 {
1935         struct ab8500_chargalg *di = dev_get_drvdata(dev);
1936
1937         if (di->chg_info.online_chg)
1938                 cancel_delayed_work_sync(&di->chargalg_wd_work);
1939
1940         cancel_delayed_work_sync(&di->chargalg_periodic_work);
1941
1942         return 0;
1943 }
1944
1945 static char *supply_interface[] = {
1946         "ab8500_fg",
1947 };
1948
1949 static const struct power_supply_desc ab8500_chargalg_desc = {
1950         .name                   = "ab8500_chargalg",
1951         .type                   = POWER_SUPPLY_TYPE_BATTERY,
1952         .properties             = ab8500_chargalg_props,
1953         .num_properties         = ARRAY_SIZE(ab8500_chargalg_props),
1954         .get_property           = ab8500_chargalg_get_property,
1955         .external_power_changed = ab8500_chargalg_external_power_changed,
1956 };
1957
1958 static int ab8500_chargalg_bind(struct device *dev, struct device *master,
1959                                 void *data)
1960 {
1961         struct ab8500_chargalg *di = dev_get_drvdata(dev);
1962
1963         /* Create a work queue for the chargalg */
1964         di->chargalg_wq = alloc_ordered_workqueue("ab8500_chargalg_wq",
1965                                                   WQ_MEM_RECLAIM);
1966         if (di->chargalg_wq == NULL) {
1967                 dev_err(di->dev, "failed to create work queue\n");
1968                 return -ENOMEM;
1969         }
1970
1971         /* Run the charging algorithm */
1972         queue_delayed_work(di->chargalg_wq, &di->chargalg_periodic_work, 0);
1973
1974         return 0;
1975 }
1976
1977 static void ab8500_chargalg_unbind(struct device *dev, struct device *master,
1978                                    void *data)
1979 {
1980         struct ab8500_chargalg *di = dev_get_drvdata(dev);
1981
1982         /* Stop all timers and work */
1983         hrtimer_cancel(&di->safety_timer);
1984         hrtimer_cancel(&di->maintenance_timer);
1985
1986         cancel_delayed_work_sync(&di->chargalg_periodic_work);
1987         cancel_delayed_work_sync(&di->chargalg_wd_work);
1988         cancel_work_sync(&di->chargalg_work);
1989
1990         /* Delete the work queue */
1991         destroy_workqueue(di->chargalg_wq);
1992         flush_scheduled_work();
1993 }
1994
1995 static const struct component_ops ab8500_chargalg_component_ops = {
1996         .bind = ab8500_chargalg_bind,
1997         .unbind = ab8500_chargalg_unbind,
1998 };
1999
2000 static int ab8500_chargalg_probe(struct platform_device *pdev)
2001 {
2002         struct device *dev = &pdev->dev;
2003         struct power_supply_config psy_cfg = {};
2004         struct ab8500_chargalg *di;
2005         int ret = 0;
2006
2007         di = devm_kzalloc(dev, sizeof(*di), GFP_KERNEL);
2008         if (!di)
2009                 return -ENOMEM;
2010
2011         di->bm = &ab8500_bm_data;
2012
2013         /* get device struct and parent */
2014         di->dev = dev;
2015         di->parent = dev_get_drvdata(pdev->dev.parent);
2016
2017         psy_cfg.supplied_to = supply_interface;
2018         psy_cfg.num_supplicants = ARRAY_SIZE(supply_interface);
2019         psy_cfg.drv_data = di;
2020
2021         /* Initilialize safety timer */
2022         hrtimer_init(&di->safety_timer, CLOCK_REALTIME, HRTIMER_MODE_ABS);
2023         di->safety_timer.function = ab8500_chargalg_safety_timer_expired;
2024
2025         /* Initilialize maintenance timer */
2026         hrtimer_init(&di->maintenance_timer, CLOCK_REALTIME, HRTIMER_MODE_ABS);
2027         di->maintenance_timer.function =
2028                 ab8500_chargalg_maintenance_timer_expired;
2029
2030         /* Init work for chargalg */
2031         INIT_DEFERRABLE_WORK(&di->chargalg_periodic_work,
2032                 ab8500_chargalg_periodic_work);
2033         INIT_DEFERRABLE_WORK(&di->chargalg_wd_work,
2034                 ab8500_chargalg_wd_work);
2035
2036         /* Init work for chargalg */
2037         INIT_WORK(&di->chargalg_work, ab8500_chargalg_work);
2038
2039         /* To detect charger at startup */
2040         di->chg_info.prev_conn_chg = -1;
2041
2042         /* Register chargalg power supply class */
2043         di->chargalg_psy = devm_power_supply_register(di->dev,
2044                                                  &ab8500_chargalg_desc,
2045                                                  &psy_cfg);
2046         if (IS_ERR(di->chargalg_psy)) {
2047                 dev_err(di->dev, "failed to register chargalg psy\n");
2048                 return PTR_ERR(di->chargalg_psy);
2049         }
2050
2051         platform_set_drvdata(pdev, di);
2052
2053         /* sysfs interface to enable/disable charging from user space */
2054         ret = ab8500_chargalg_sysfs_init(di);
2055         if (ret) {
2056                 dev_err(di->dev, "failed to create sysfs entry\n");
2057                 return ret;
2058         }
2059         di->curr_status.curr_step = CHARGALG_CURR_STEP_HIGH;
2060
2061         dev_info(di->dev, "probe success\n");
2062         return component_add(dev, &ab8500_chargalg_component_ops);
2063 }
2064
2065 static int ab8500_chargalg_remove(struct platform_device *pdev)
2066 {
2067         struct ab8500_chargalg *di = platform_get_drvdata(pdev);
2068
2069         component_del(&pdev->dev, &ab8500_chargalg_component_ops);
2070
2071         /* sysfs interface to enable/disable charging from user space */
2072         ab8500_chargalg_sysfs_exit(di);
2073
2074         return 0;
2075 }
2076
2077 static SIMPLE_DEV_PM_OPS(ab8500_chargalg_pm_ops, ab8500_chargalg_suspend, ab8500_chargalg_resume);
2078
2079 static const struct of_device_id ab8500_chargalg_match[] = {
2080         { .compatible = "stericsson,ab8500-chargalg", },
2081         { },
2082 };
2083
2084 struct platform_driver ab8500_chargalg_driver = {
2085         .probe = ab8500_chargalg_probe,
2086         .remove = ab8500_chargalg_remove,
2087         .driver = {
2088                 .name = "ab8500_chargalg",
2089                 .of_match_table = ab8500_chargalg_match,
2090                 .pm = &ab8500_chargalg_pm_ops,
2091         },
2092 };
2093 MODULE_LICENSE("GPL v2");
2094 MODULE_AUTHOR("Johan Palsson, Karl Komierowski");
2095 MODULE_ALIAS("platform:ab8500-chargalg");
2096 MODULE_DESCRIPTION("ab8500 battery charging algorithm");