drivers/power/supply/ab8500_fg.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) ST-Ericsson AB 2012
   4  *
   5  * Main and Back-up battery management driver.
   6  *
   7  * Note: Backup battery management is required in case of Li-Ion battery and not
   8  * for capacitive battery. HREF boards have capacitive battery and hence backup
   9  * battery management is not used and the supported code is available in this
  10  * driver.
  11  *
  12  * Author:
  13  *      Johan Palsson <johan.palsson@stericsson.com>
  14  *      Karl Komierowski <karl.komierowski@stericsson.com>
  15  *      Arun R Murthy <arun.murthy@stericsson.com>
  16  */
  17
  18 #include <linux/init.h>
  19 #include <linux/module.h>
  20 #include <linux/component.h>
  21 #include <linux/device.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/power_supply.h>
  25 #include <linux/kobject.h>
  26 #include <linux/slab.h>
  27 #include <linux/delay.h>
  28 #include <linux/time.h>
  29 #include <linux/time64.h>
  30 #include <linux/of.h>
  31 #include <linux/completion.h>
  32 #include <linux/mfd/core.h>
  33 #include <linux/mfd/abx500.h>
  34 #include <linux/mfd/abx500/ab8500.h>
  35 #include <linux/iio/consumer.h>
  36 #include <linux/kernel.h>
  37
  38 #include "ab8500-bm.h"
  39
  40 #define MILLI_TO_MICRO                  1000
  41 #define FG_LSB_IN_MA                    1627
  42 #define QLSB_NANO_AMP_HOURS_X10         1071
  43 #define INS_CURR_TIMEOUT                (3 * HZ)
  44
  45 #define SEC_TO_SAMPLE(S)                (S * 4)
  46
  47 #define NBR_AVG_SAMPLES                 20
  48
  49 #define LOW_BAT_CHECK_INTERVAL          (HZ / 16) /* 62.5 ms */
  50
  51 #define VALID_CAPACITY_SEC              (45 * 60) /* 45 minutes */
  52 #define BATT_OK_MIN                     2360 /* mV */
  53 #define BATT_OK_INCREMENT               50 /* mV */
  54 #define BATT_OK_MAX_NR_INCREMENTS       0xE
  55
  56 /* FG constants */
  57 #define BATT_OVV                        0x01
  58
  59 #define interpolate(x, x1, y1, x2, y2) \
  60         ((y1) + ((((y2) - (y1)) * ((x) - (x1))) / ((x2) - (x1))));
  61
  62 /**
  63  * struct ab8500_fg_interrupts - ab8500 fg interrupts
  64  * @name:       name of the interrupt
  65  * @isr         function pointer to the isr
  66  */
  67 struct ab8500_fg_interrupts {
  68         char *name;
  69         irqreturn_t (*isr)(int irq, void *data);
  70 };
  71
  72 enum ab8500_fg_discharge_state {
  73         AB8500_FG_DISCHARGE_INIT,
  74         AB8500_FG_DISCHARGE_INITMEASURING,
  75         AB8500_FG_DISCHARGE_INIT_RECOVERY,
  76         AB8500_FG_DISCHARGE_RECOVERY,
  77         AB8500_FG_DISCHARGE_READOUT_INIT,
  78         AB8500_FG_DISCHARGE_READOUT,
  79         AB8500_FG_DISCHARGE_WAKEUP,
  80 };
  81
  82 static char *discharge_state[] = {
  83         "DISCHARGE_INIT",
  84         "DISCHARGE_INITMEASURING",
  85         "DISCHARGE_INIT_RECOVERY",
  86         "DISCHARGE_RECOVERY",
  87         "DISCHARGE_READOUT_INIT",
  88         "DISCHARGE_READOUT",
  89         "DISCHARGE_WAKEUP",
  90 };
  91
  92 enum ab8500_fg_charge_state {
  93         AB8500_FG_CHARGE_INIT,
  94         AB8500_FG_CHARGE_READOUT,
  95 };
  96
  97 static char *charge_state[] = {
  98         "CHARGE_INIT",
  99         "CHARGE_READOUT",
 100 };
 101
 102 enum ab8500_fg_calibration_state {
 103         AB8500_FG_CALIB_INIT,
 104         AB8500_FG_CALIB_WAIT,
 105         AB8500_FG_CALIB_END,
 106 };
 107
 108 struct ab8500_fg_avg_cap {
 109         int avg;
 110         int samples[NBR_AVG_SAMPLES];
 111         time64_t time_stamps[NBR_AVG_SAMPLES];
 112         int pos;
 113         int nbr_samples;
 114         int sum;
 115 };
 116
 117 struct ab8500_fg_cap_scaling {
 118         bool enable;
 119         int cap_to_scale[2];
 120         int disable_cap_level;
 121         int scaled_cap;
 122 };
 123
 124 struct ab8500_fg_battery_capacity {
 125         int max_mah_design;
 126         int max_mah;
 127         int mah;
 128         int permille;
 129         int level;
 130         int prev_mah;
 131         int prev_percent;
 132         int prev_level;
 133         int user_mah;
 134         struct ab8500_fg_cap_scaling cap_scale;
 135 };
 136
 137 struct ab8500_fg_flags {
 138         bool fg_enabled;
 139         bool conv_done;
 140         bool charging;
 141         bool fully_charged;
 142         bool force_full;
 143         bool low_bat_delay;
 144         bool low_bat;
 145         bool bat_ovv;
 146         bool batt_unknown;
 147         bool calibrate;
 148         bool user_cap;
 149         bool batt_id_received;
 150 };
 151
 152 struct inst_curr_result_list {
 153         struct list_head list;
 154         int *result;
 155 };
 156
 157 /**
 158  * struct ab8500_fg - ab8500 FG device information
 159  * @dev:                Pointer to the structure device
 160  * @node:               a list of AB8500 FGs, hence prepared for reentrance
 161  * @irq                 holds the CCEOC interrupt number
 162  * @vbat:               Battery voltage in mV
 163  * @vbat_nom:           Nominal battery voltage in mV
 164  * @inst_curr:          Instantenous battery current in mA
 165  * @avg_curr:           Average battery current in mA
 166  * @bat_temp            battery temperature
 167  * @fg_samples:         Number of samples used in the FG accumulation
 168  * @accu_charge:        Accumulated charge from the last conversion
 169  * @recovery_cnt:       Counter for recovery mode
 170  * @high_curr_cnt:      Counter for high current mode
 171  * @init_cnt:           Counter for init mode
 172  * @low_bat_cnt         Counter for number of consecutive low battery measures
 173  * @nbr_cceoc_irq_cnt   Counter for number of CCEOC irqs received since enabled
 174  * @recovery_needed:    Indicate if recovery is needed
 175  * @high_curr_mode:     Indicate if we're in high current mode
 176  * @init_capacity:      Indicate if initial capacity measuring should be done
 177  * @turn_off_fg:        True if fg was off before current measurement
 178  * @calib_state         State during offset calibration
 179  * @discharge_state:    Current discharge state
 180  * @charge_state:       Current charge state
 181  * @ab8500_fg_started   Completion struct used for the instant current start
 182  * @ab8500_fg_complete  Completion struct used for the instant current reading
 183  * @flags:              Structure for information about events triggered
 184  * @bat_cap:            Structure for battery capacity specific parameters
 185  * @avg_cap:            Average capacity filter
 186  * @parent:             Pointer to the struct ab8500
 187  * @main_bat_v:         ADC channel for the main battery voltage
 188  * @bm:                 Platform specific battery management information
 189  * @fg_psy:             Structure that holds the FG specific battery properties
 190  * @fg_wq:              Work queue for running the FG algorithm
 191  * @fg_periodic_work:   Work to run the FG algorithm periodically
 192  * @fg_low_bat_work:    Work to check low bat condition
 193  * @fg_reinit_work      Work used to reset and reinitialise the FG algorithm
 194  * @fg_work:            Work to run the FG algorithm instantly
 195  * @fg_acc_cur_work:    Work to read the FG accumulator
 196  * @fg_check_hw_failure_work:   Work for checking HW state
 197  * @cc_lock:            Mutex for locking the CC
 198  * @fg_kobject:         Structure of type kobject
 199  */
 200 struct ab8500_fg {
 201         struct device *dev;
 202         struct list_head node;
 203         int irq;
 204         int vbat;
 205         int vbat_nom;
 206         int inst_curr;
 207         int avg_curr;
 208         int bat_temp;
 209         int fg_samples;
 210         int accu_charge;
 211         int recovery_cnt;
 212         int high_curr_cnt;
 213         int init_cnt;
 214         int low_bat_cnt;
 215         int nbr_cceoc_irq_cnt;
 216         bool recovery_needed;
 217         bool high_curr_mode;
 218         bool init_capacity;
 219         bool turn_off_fg;
 220         enum ab8500_fg_calibration_state calib_state;
 221         enum ab8500_fg_discharge_state discharge_state;
 222         enum ab8500_fg_charge_state charge_state;
 223         struct completion ab8500_fg_started;
 224         struct completion ab8500_fg_complete;
 225         struct ab8500_fg_flags flags;
 226         struct ab8500_fg_battery_capacity bat_cap;
 227         struct ab8500_fg_avg_cap avg_cap;
 228         struct ab8500 *parent;
 229         struct iio_channel *main_bat_v;
 230         struct abx500_bm_data *bm;
 231         struct power_supply *fg_psy;
 232         struct workqueue_struct *fg_wq;
 233         struct delayed_work fg_periodic_work;
 234         struct delayed_work fg_low_bat_work;
 235         struct delayed_work fg_reinit_work;
 236         struct work_struct fg_work;
 237         struct work_struct fg_acc_cur_work;
 238         struct delayed_work fg_check_hw_failure_work;
 239         struct mutex cc_lock;
 240         struct kobject fg_kobject;
 241 };
 242 static LIST_HEAD(ab8500_fg_list);
 243
 244 /**
 245  * ab8500_fg_get() - returns a reference to the primary AB8500 fuel gauge
 246  * (i.e. the first fuel gauge in the instance list)
 247  */
 248 struct ab8500_fg *ab8500_fg_get(void)
 249 {
 250         return list_first_entry_or_null(&ab8500_fg_list, struct ab8500_fg,
 251                                         node);
 252 }
 253
 254 /* Main battery properties */
 255 static enum power_supply_property ab8500_fg_props[] = {
 256         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 257         POWER_SUPPLY_PROP_CURRENT_NOW,
 258         POWER_SUPPLY_PROP_CURRENT_AVG,
 259         POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
 260         POWER_SUPPLY_PROP_ENERGY_FULL,
 261         POWER_SUPPLY_PROP_ENERGY_NOW,
 262         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 263         POWER_SUPPLY_PROP_CHARGE_FULL,
 264         POWER_SUPPLY_PROP_CHARGE_NOW,
 265         POWER_SUPPLY_PROP_CAPACITY,
 266         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 267 };
 268
 269 /*
 270  * This array maps the raw hex value to lowbat voltage used by the AB8500
 271  * Values taken from the UM0836
 272  */
 273 static int ab8500_fg_lowbat_voltage_map[] = {
 274         2300 ,
 275         2325 ,
 276         2350 ,
 277         2375 ,
 278         2400 ,
 279         2425 ,
 280         2450 ,
 281         2475 ,
 282         2500 ,
 283         2525 ,
 284         2550 ,
 285         2575 ,
 286         2600 ,
 287         2625 ,
 288         2650 ,
 289         2675 ,
 290         2700 ,
 291         2725 ,
 292         2750 ,
 293         2775 ,
 294         2800 ,
 295         2825 ,
 296         2850 ,
 297         2875 ,
 298         2900 ,
 299         2925 ,
 300         2950 ,
 301         2975 ,
 302         3000 ,
 303         3025 ,
 304         3050 ,
 305         3075 ,
 306         3100 ,
 307         3125 ,
 308         3150 ,
 309         3175 ,
 310         3200 ,
 311         3225 ,
 312         3250 ,
 313         3275 ,
 314         3300 ,
 315         3325 ,
 316         3350 ,
 317         3375 ,
 318         3400 ,
 319         3425 ,
 320         3450 ,
 321         3475 ,
 322         3500 ,
 323         3525 ,
 324         3550 ,
 325         3575 ,
 326         3600 ,
 327         3625 ,
 328         3650 ,
 329         3675 ,
 330         3700 ,
 331         3725 ,
 332         3750 ,
 333         3775 ,
 334         3800 ,
 335         3825 ,
 336         3850 ,
 337         3850 ,
 338 };
 339
 340 static u8 ab8500_volt_to_regval(int voltage)
 341 {
 342         int i;
 343
 344         if (voltage < ab8500_fg_lowbat_voltage_map[0])
 345                 return 0;
 346
 347         for (i = 0; i < ARRAY_SIZE(ab8500_fg_lowbat_voltage_map); i++) {
 348                 if (voltage < ab8500_fg_lowbat_voltage_map[i])
 349                         return (u8) i - 1;
 350         }
 351
 352         /* If not captured above, return index of last element */
 353         return (u8) ARRAY_SIZE(ab8500_fg_lowbat_voltage_map) - 1;
 354 }
 355
 356 /**
 357  * ab8500_fg_is_low_curr() - Low or high current mode
 358  * @di:         pointer to the ab8500_fg structure
 359  * @curr:       the current to base or our decision on
 360  *
 361  * Low current mode if the current consumption is below a certain threshold
 362  */
 363 static int ab8500_fg_is_low_curr(struct ab8500_fg *di, int curr)
 364 {
 365         /*
 366          * We want to know if we're in low current mode
 367          */
 368         if (curr > -di->bm->fg_params->high_curr_threshold)
 369                 return true;
 370         else
 371                 return false;
 372 }
 373
 374 /**
 375  * ab8500_fg_add_cap_sample() - Add capacity to average filter
 376  * @di:         pointer to the ab8500_fg structure
 377  * @sample:     the capacity in mAh to add to the filter
 378  *
 379  * A capacity is added to the filter and a new mean capacity is calculated and
 380  * returned
 381  */
 382 static int ab8500_fg_add_cap_sample(struct ab8500_fg *di, int sample)
 383 {
 384         time64_t now = ktime_get_boottime_seconds();
 385         struct ab8500_fg_avg_cap *avg = &di->avg_cap;
 386
 387         do {
 388                 avg->sum += sample - avg->samples[avg->pos];
 389                 avg->samples[avg->pos] = sample;
 390                 avg->time_stamps[avg->pos] = now;
 391                 avg->pos++;
 392
 393                 if (avg->pos == NBR_AVG_SAMPLES)
 394                         avg->pos = 0;
 395
 396                 if (avg->nbr_samples < NBR_AVG_SAMPLES)
 397                         avg->nbr_samples++;
 398
 399                 /*
 400                  * Check the time stamp for each sample. If too old,
 401                  * replace with latest sample
 402                  */
 403         } while (now - VALID_CAPACITY_SEC > avg->time_stamps[avg->pos]);
 404
 405         avg->avg = avg->sum / avg->nbr_samples;
 406
 407         return avg->avg;
 408 }
 409
 410 /**
 411  * ab8500_fg_clear_cap_samples() - Clear average filter
 412  * @di:         pointer to the ab8500_fg structure
 413  *
 414  * The capacity filter is is reset to zero.
 415  */
 416 static void ab8500_fg_clear_cap_samples(struct ab8500_fg *di)
 417 {
 418         int i;
 419         struct ab8500_fg_avg_cap *avg = &di->avg_cap;
 420
 421         avg->pos = 0;
 422         avg->nbr_samples = 0;
 423         avg->sum = 0;
 424         avg->avg = 0;
 425
 426         for (i = 0; i < NBR_AVG_SAMPLES; i++) {
 427                 avg->samples[i] = 0;
 428                 avg->time_stamps[i] = 0;
 429         }
 430 }
 431
 432 /**
 433  * ab8500_fg_fill_cap_sample() - Fill average filter
 434  * @di:         pointer to the ab8500_fg structure
 435  * @sample:     the capacity in mAh to fill the filter with
 436  *
 437  * The capacity filter is filled with a capacity in mAh
 438  */
 439 static void ab8500_fg_fill_cap_sample(struct ab8500_fg *di, int sample)
 440 {
 441         int i;
 442         time64_t now;
 443         struct ab8500_fg_avg_cap *avg = &di->avg_cap;
 444
 445         now = ktime_get_boottime_seconds();
 446
 447         for (i = 0; i < NBR_AVG_SAMPLES; i++) {
 448                 avg->samples[i] = sample;
 449                 avg->time_stamps[i] = now;
 450         }
 451
 452         avg->pos = 0;
 453         avg->nbr_samples = NBR_AVG_SAMPLES;
 454         avg->sum = sample * NBR_AVG_SAMPLES;
 455         avg->avg = sample;
 456 }
 457
 458 /**
 459  * ab8500_fg_coulomb_counter() - enable coulomb counter
 460  * @di:         pointer to the ab8500_fg structure
 461  * @enable:     enable/disable
 462  *
 463  * Enable/Disable coulomb counter.
 464  * On failure returns negative value.
 465  */
 466 static int ab8500_fg_coulomb_counter(struct ab8500_fg *di, bool enable)
 467 {
 468         int ret = 0;
 469         mutex_lock(&di->cc_lock);
 470         if (enable) {
 471                 /* To be able to reprogram the number of samples, we have to
 472                  * first stop the CC and then enable it again */
 473                 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
 474                         AB8500_RTC_CC_CONF_REG, 0x00);
 475                 if (ret)
 476                         goto cc_err;
 477
 478                 /* Program the samples */
 479                 ret = abx500_set_register_interruptible(di->dev,
 480                         AB8500_GAS_GAUGE, AB8500_GASG_CC_NCOV_ACCU,
 481                         di->fg_samples);
 482                 if (ret)
 483                         goto cc_err;
 484
 485                 /* Start the CC */
 486                 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
 487                         AB8500_RTC_CC_CONF_REG,
 488                         (CC_DEEP_SLEEP_ENA | CC_PWR_UP_ENA));
 489                 if (ret)
 490                         goto cc_err;
 491
 492                 di->flags.fg_enabled = true;
 493         } else {
 494                 /* Clear any pending read requests */
 495                 ret = abx500_mask_and_set_register_interruptible(di->dev,
 496                         AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG,
 497                         (RESET_ACCU | READ_REQ), 0);
 498                 if (ret)
 499                         goto cc_err;
 500
 501                 ret = abx500_set_register_interruptible(di->dev,
 502                         AB8500_GAS_GAUGE, AB8500_GASG_CC_NCOV_ACCU_CTRL, 0);
 503                 if (ret)
 504                         goto cc_err;
 505
 506                 /* Stop the CC */
 507                 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
 508                         AB8500_RTC_CC_CONF_REG, 0);
 509                 if (ret)
 510                         goto cc_err;
 511
 512                 di->flags.fg_enabled = false;
 513
 514         }
 515         dev_dbg(di->dev, " CC enabled: %d Samples: %d\n",
 516                 enable, di->fg_samples);
 517
 518         mutex_unlock(&di->cc_lock);
 519
 520         return ret;
 521 cc_err:
 522         dev_err(di->dev, "%s Enabling coulomb counter failed\n", __func__);
 523         mutex_unlock(&di->cc_lock);
 524         return ret;
 525 }
 526
 527 /**
 528  * ab8500_fg_inst_curr_start() - start battery instantaneous current
 529  * @di:         pointer to the ab8500_fg structure
 530  *
 531  * Returns 0 or error code
 532  * Note: This is part "one" and has to be called before
 533  * ab8500_fg_inst_curr_finalize()
 534  */
 535 int ab8500_fg_inst_curr_start(struct ab8500_fg *di)
 536 {
 537         u8 reg_val;
 538         int ret;
 539
 540         mutex_lock(&di->cc_lock);
 541
 542         di->nbr_cceoc_irq_cnt = 0;
 543         ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
 544                 AB8500_RTC_CC_CONF_REG, &reg_val);
 545         if (ret < 0)
 546                 goto fail;
 547
 548         if (!(reg_val & CC_PWR_UP_ENA)) {
 549                 dev_dbg(di->dev, "%s Enable FG\n", __func__);
 550                 di->turn_off_fg = true;
 551
 552                 /* Program the samples */
 553                 ret = abx500_set_register_interruptible(di->dev,
 554                         AB8500_GAS_GAUGE, AB8500_GASG_CC_NCOV_ACCU,
 555                         SEC_TO_SAMPLE(10));
 556                 if (ret)
 557                         goto fail;
 558
 559                 /* Start the CC */
 560                 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
 561                         AB8500_RTC_CC_CONF_REG,
 562                         (CC_DEEP_SLEEP_ENA | CC_PWR_UP_ENA));
 563                 if (ret)
 564                         goto fail;
 565         } else {
 566                 di->turn_off_fg = false;
 567         }
 568
 569         /* Return and WFI */
 570         reinit_completion(&di->ab8500_fg_started);
 571         reinit_completion(&di->ab8500_fg_complete);
 572         enable_irq(di->irq);
 573
 574         /* Note: cc_lock is still locked */
 575         return 0;
 576 fail:
 577         mutex_unlock(&di->cc_lock);
 578         return ret;
 579 }
 580
 581 /**
 582  * ab8500_fg_inst_curr_started() - check if fg conversion has started
 583  * @di:         pointer to the ab8500_fg structure
 584  *
 585  * Returns 1 if conversion started, 0 if still waiting
 586  */
 587 int ab8500_fg_inst_curr_started(struct ab8500_fg *di)
 588 {
 589         return completion_done(&di->ab8500_fg_started);
 590 }
 591
 592 /**
 593  * ab8500_fg_inst_curr_done() - check if fg conversion is done
 594  * @di:         pointer to the ab8500_fg structure
 595  *
 596  * Returns 1 if conversion done, 0 if still waiting
 597  */
 598 int ab8500_fg_inst_curr_done(struct ab8500_fg *di)
 599 {
 600         return completion_done(&di->ab8500_fg_complete);
 601 }
 602
 603 /**
 604  * ab8500_fg_inst_curr_finalize() - battery instantaneous current
 605  * @di:         pointer to the ab8500_fg structure
 606  * @res:        battery instantenous current(on success)
 607  *
 608  * Returns 0 or an error code
 609  * Note: This is part "two" and has to be called at earliest 250 ms
 610  * after ab8500_fg_inst_curr_start()
 611  */
 612 int ab8500_fg_inst_curr_finalize(struct ab8500_fg *di, int *res)
 613 {
 614         u8 low, high;
 615         int val;
 616         int ret;
 617         unsigned long timeout;
 618
 619         if (!completion_done(&di->ab8500_fg_complete)) {
 620                 timeout = wait_for_completion_timeout(
 621                         &di->ab8500_fg_complete,
 622                         INS_CURR_TIMEOUT);
 623                 dev_dbg(di->dev, "Finalize time: %d ms\n",
 624                         jiffies_to_msecs(INS_CURR_TIMEOUT - timeout));
 625                 if (!timeout) {
 626                         ret = -ETIME;
 627                         disable_irq(di->irq);
 628                         di->nbr_cceoc_irq_cnt = 0;
 629                         dev_err(di->dev, "completion timed out [%d]\n",
 630                                 __LINE__);
 631                         goto fail;
 632                 }
 633         }
 634
 635         disable_irq(di->irq);
 636         di->nbr_cceoc_irq_cnt = 0;
 637
 638         ret = abx500_mask_and_set_register_interruptible(di->dev,
 639                         AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG,
 640                         READ_REQ, READ_REQ);
 641
 642         /* 100uS between read request and read is needed */
 643         usleep_range(100, 100);
 644
 645         /* Read CC Sample conversion value Low and high */
 646         ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE,
 647                 AB8500_GASG_CC_SMPL_CNVL_REG,  &low);
 648         if (ret < 0)
 649                 goto fail;
 650
 651         ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE,
 652                 AB8500_GASG_CC_SMPL_CNVH_REG,  &high);
 653         if (ret < 0)
 654                 goto fail;
 655
 656         /*
 657          * negative value for Discharging
 658          * convert 2's complement into decimal
 659          */
 660         if (high & 0x10)
 661                 val = (low | (high << 8) | 0xFFFFE000);
 662         else
 663                 val = (low | (high << 8));
 664
 665         /*
 666          * Convert to unit value in mA
 667          * Full scale input voltage is
 668          * 63.160mV => LSB = 63.160mV/(4096*res) = 1.542mA
 669          * Given a 250ms conversion cycle time the LSB corresponds
 670          * to 107.1 nAh. Convert to current by dividing by the conversion
 671          * time in hours (250ms = 1 / (3600 * 4)h)
 672          * 107.1nAh assumes 10mOhm, but fg_res is in 0.1mOhm
 673          */
 674         val = (val * QLSB_NANO_AMP_HOURS_X10 * 36 * 4) /
 675                 (1000 * di->bm->fg_res);
 676
 677         if (di->turn_off_fg) {
 678                 dev_dbg(di->dev, "%s Disable FG\n", __func__);
 679
 680                 /* Clear any pending read requests */
 681                 ret = abx500_set_register_interruptible(di->dev,
 682                         AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG, 0);
 683                 if (ret)
 684                         goto fail;
 685
 686                 /* Stop the CC */
 687                 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
 688                         AB8500_RTC_CC_CONF_REG, 0);
 689                 if (ret)
 690                         goto fail;
 691         }
 692         mutex_unlock(&di->cc_lock);
 693         (*res) = val;
 694
 695         return 0;
 696 fail:
 697         mutex_unlock(&di->cc_lock);
 698         return ret;
 699 }
 700
 701 /**
 702  * ab8500_fg_inst_curr_blocking() - battery instantaneous current
 703  * @di:         pointer to the ab8500_fg structure
 704  * @res:        battery instantenous current(on success)
 705  *
 706  * Returns 0 else error code
 707  */
 708 int ab8500_fg_inst_curr_blocking(struct ab8500_fg *di)
 709 {
 710         int ret;
 711         unsigned long timeout;
 712         int res = 0;
 713
 714         ret = ab8500_fg_inst_curr_start(di);
 715         if (ret) {
 716                 dev_err(di->dev, "Failed to initialize fg_inst\n");
 717                 return 0;
 718         }
 719
 720         /* Wait for CC to actually start */
 721         if (!completion_done(&di->ab8500_fg_started)) {
 722                 timeout = wait_for_completion_timeout(
 723                         &di->ab8500_fg_started,
 724                         INS_CURR_TIMEOUT);
 725                 dev_dbg(di->dev, "Start time: %d ms\n",
 726                         jiffies_to_msecs(INS_CURR_TIMEOUT - timeout));
 727                 if (!timeout) {
 728                         ret = -ETIME;
 729                         dev_err(di->dev, "completion timed out [%d]\n",
 730                                 __LINE__);
 731                         goto fail;
 732                 }
 733         }
 734
 735         ret = ab8500_fg_inst_curr_finalize(di, &res);
 736         if (ret) {
 737                 dev_err(di->dev, "Failed to finalize fg_inst\n");
 738                 return 0;
 739         }
 740
 741         dev_dbg(di->dev, "%s instant current: %d", __func__, res);
 742         return res;
 743 fail:
 744         disable_irq(di->irq);
 745         mutex_unlock(&di->cc_lock);
 746         return ret;
 747 }
 748
 749 /**
 750  * ab8500_fg_acc_cur_work() - average battery current
 751  * @work:       pointer to the work_struct structure
 752  *
 753  * Updated the average battery current obtained from the
 754  * coulomb counter.
 755  */
 756 static void ab8500_fg_acc_cur_work(struct work_struct *work)
 757 {
 758         int val;
 759         int ret;
 760         u8 low, med, high;
 761
 762         struct ab8500_fg *di = container_of(work,
 763                 struct ab8500_fg, fg_acc_cur_work);
 764
 765         mutex_lock(&di->cc_lock);
 766         ret = abx500_set_register_interruptible(di->dev, AB8500_GAS_GAUGE,
 767                 AB8500_GASG_CC_NCOV_ACCU_CTRL, RD_NCONV_ACCU_REQ);
 768         if (ret)
 769                 goto exit;
 770
 771         ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE,
 772                 AB8500_GASG_CC_NCOV_ACCU_LOW,  &low);
 773         if (ret < 0)
 774                 goto exit;
 775
 776         ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE,
 777                 AB8500_GASG_CC_NCOV_ACCU_MED,  &med);
 778         if (ret < 0)
 779                 goto exit;
 780
 781         ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE,
 782                 AB8500_GASG_CC_NCOV_ACCU_HIGH, &high);
 783         if (ret < 0)
 784                 goto exit;
 785
 786         /* Check for sign bit in case of negative value, 2's complement */
 787         if (high & 0x10)
 788                 val = (low | (med << 8) | (high << 16) | 0xFFE00000);
 789         else
 790                 val = (low | (med << 8) | (high << 16));
 791
 792         /*
 793          * Convert to uAh
 794          * Given a 250ms conversion cycle time the LSB corresponds
 795          * to 112.9 nAh.
 796          * 112.9nAh assumes 10mOhm, but fg_res is in 0.1mOhm
 797          */
 798         di->accu_charge = (val * QLSB_NANO_AMP_HOURS_X10) /
 799                 (100 * di->bm->fg_res);
 800
 801         /*
 802          * Convert to unit value in mA
 803          * by dividing by the conversion
 804          * time in hours (= samples / (3600 * 4)h)
 805          * and multiply with 1000
 806          */
 807         di->avg_curr = (val * QLSB_NANO_AMP_HOURS_X10 * 36) /
 808                 (1000 * di->bm->fg_res * (di->fg_samples / 4));
 809
 810         di->flags.conv_done = true;
 811
 812         mutex_unlock(&di->cc_lock);
 813
 814         queue_work(di->fg_wq, &di->fg_work);
 815
 816         dev_dbg(di->dev, "fg_res: %d, fg_samples: %d, gasg: %d, accu_charge: %d \n",
 817                                 di->bm->fg_res, di->fg_samples, val, di->accu_charge);
 818         return;
 819 exit:
 820         dev_err(di->dev,
 821                 "Failed to read or write gas gauge registers\n");
 822         mutex_unlock(&di->cc_lock);
 823         queue_work(di->fg_wq, &di->fg_work);
 824 }
 825
 826 /**
 827  * ab8500_fg_bat_voltage() - get battery voltage
 828  * @di:         pointer to the ab8500_fg structure
 829  *
 830  * Returns battery voltage(on success) else error code
 831  */
 832 static int ab8500_fg_bat_voltage(struct ab8500_fg *di)
 833 {
 834         int vbat, ret;
 835         static int prev;
 836
 837         ret = iio_read_channel_processed(di->main_bat_v, &vbat);
 838         if (ret < 0) {
 839                 dev_err(di->dev,
 840                         "%s ADC conversion failed, using previous value\n",
 841                         __func__);
 842                 return prev;
 843         }
 844
 845         prev = vbat;
 846         return vbat;
 847 }
 848
 849 /**
 850  * ab8500_fg_volt_to_capacity() - Voltage based capacity
 851  * @di:         pointer to the ab8500_fg structure
 852  * @voltage:    The voltage to convert to a capacity
 853  *
 854  * Returns battery capacity in per mille based on voltage
 855  */
 856 static int ab8500_fg_volt_to_capacity(struct ab8500_fg *di, int voltage)
 857 {
 858         int i, tbl_size;
 859         const struct abx500_v_to_cap *tbl;
 860         int cap = 0;
 861
 862         tbl = di->bm->bat_type[di->bm->batt_id].v_to_cap_tbl;
 863         tbl_size = di->bm->bat_type[di->bm->batt_id].n_v_cap_tbl_elements;
 864
 865         for (i = 0; i < tbl_size; ++i) {
 866                 if (voltage > tbl[i].voltage)
 867                         break;
 868         }
 869
 870         if ((i > 0) && (i < tbl_size)) {
 871                 cap = interpolate(voltage,
 872                         tbl[i].voltage,
 873                         tbl[i].capacity * 10,
 874                         tbl[i-1].voltage,
 875                         tbl[i-1].capacity * 10);
 876         } else if (i == 0) {
 877                 cap = 1000;
 878         } else {
 879                 cap = 0;
 880         }
 881
 882         dev_dbg(di->dev, "%s Vbat: %d, Cap: %d per mille",
 883                 __func__, voltage, cap);
 884
 885         return cap;
 886 }
 887
 888 /**
 889  * ab8500_fg_uncomp_volt_to_capacity() - Uncompensated voltage based capacity
 890  * @di:         pointer to the ab8500_fg structure
 891  *
 892  * Returns battery capacity based on battery voltage that is not compensated
 893  * for the voltage drop due to the load
 894  */
 895 static int ab8500_fg_uncomp_volt_to_capacity(struct ab8500_fg *di)
 896 {
 897         di->vbat = ab8500_fg_bat_voltage(di);
 898         return ab8500_fg_volt_to_capacity(di, di->vbat);
 899 }
 900
 901 /**
 902  * ab8500_fg_battery_resistance() - Returns the battery inner resistance
 903  * @di:         pointer to the ab8500_fg structure
 904  *
 905  * Returns battery inner resistance added with the fuel gauge resistor value
 906  * to get the total resistance in the whole link from gnd to bat+ node.
 907  */
 908 static int ab8500_fg_battery_resistance(struct ab8500_fg *di)
 909 {
 910         int i, tbl_size;
 911         const struct batres_vs_temp *tbl;
 912         int resist = 0;
 913
 914         tbl = di->bm->bat_type[di->bm->batt_id].batres_tbl;
 915         tbl_size = di->bm->bat_type[di->bm->batt_id].n_batres_tbl_elements;
 916
 917         for (i = 0; i < tbl_size; ++i) {
 918                 if (di->bat_temp / 10 > tbl[i].temp)
 919                         break;
 920         }
 921
 922         if ((i > 0) && (i < tbl_size)) {
 923                 resist = interpolate(di->bat_temp / 10,
 924                         tbl[i].temp,
 925                         tbl[i].resist,
 926                         tbl[i-1].temp,
 927                         tbl[i-1].resist);
 928         } else if (i == 0) {
 929                 resist = tbl[0].resist;
 930         } else {
 931                 resist = tbl[tbl_size - 1].resist;
 932         }
 933
 934         dev_dbg(di->dev, "%s Temp: %d battery internal resistance: %d"
 935             " fg resistance %d, total: %d (mOhm)\n",
 936                 __func__, di->bat_temp, resist, di->bm->fg_res / 10,
 937                 (di->bm->fg_res / 10) + resist);
 938
 939         /* fg_res variable is in 0.1mOhm */
 940         resist += di->bm->fg_res / 10;
 941
 942         return resist;
 943 }
 944
 945 /**
 946  * ab8500_fg_load_comp_volt_to_capacity() - Load compensated voltage based capacity
 947  * @di:         pointer to the ab8500_fg structure
 948  *
 949  * Returns battery capacity based on battery voltage that is load compensated
 950  * for the voltage drop
 951  */
 952 static int ab8500_fg_load_comp_volt_to_capacity(struct ab8500_fg *di)
 953 {
 954         int vbat_comp, res;
 955         int i = 0;
 956         int vbat = 0;
 957
 958         ab8500_fg_inst_curr_start(di);
 959
 960         do {
 961                 vbat += ab8500_fg_bat_voltage(di);
 962                 i++;
 963                 usleep_range(5000, 6000);
 964         } while (!ab8500_fg_inst_curr_done(di));
 965
 966         ab8500_fg_inst_curr_finalize(di, &di->inst_curr);
 967
 968         di->vbat = vbat / i;
 969         res = ab8500_fg_battery_resistance(di);
 970
 971         /* Use Ohms law to get the load compensated voltage */
 972         vbat_comp = di->vbat - (di->inst_curr * res) / 1000;
 973
 974         dev_dbg(di->dev, "%s Measured Vbat: %dmV,Compensated Vbat %dmV, "
 975                 "R: %dmOhm, Current: %dmA Vbat Samples: %d\n",
 976                 __func__, di->vbat, vbat_comp, res, di->inst_curr, i);
 977
 978         return ab8500_fg_volt_to_capacity(di, vbat_comp);
 979 }
 980
 981 /**
 982  * ab8500_fg_convert_mah_to_permille() - Capacity in mAh to permille
 983  * @di:         pointer to the ab8500_fg structure
 984  * @cap_mah:    capacity in mAh
 985  *
 986  * Converts capacity in mAh to capacity in permille
 987  */
 988 static int ab8500_fg_convert_mah_to_permille(struct ab8500_fg *di, int cap_mah)
 989 {
 990         return (cap_mah * 1000) / di->bat_cap.max_mah_design;
 991 }
 992
 993 /**
 994  * ab8500_fg_convert_permille_to_mah() - Capacity in permille to mAh
 995  * @di:         pointer to the ab8500_fg structure
 996  * @cap_pm:     capacity in permille
 997  *
 998  * Converts capacity in permille to capacity in mAh
 999  */
1000 static int ab8500_fg_convert_permille_to_mah(struct ab8500_fg *di, int cap_pm)
1001 {
1002         return cap_pm * di->bat_cap.max_mah_design / 1000;
1003 }
1004
1005 /**
1006  * ab8500_fg_convert_mah_to_uwh() - Capacity in mAh to uWh
1007  * @di:         pointer to the ab8500_fg structure
1008  * @cap_mah:    capacity in mAh
1009  *
1010  * Converts capacity in mAh to capacity in uWh
1011  */
1012 static int ab8500_fg_convert_mah_to_uwh(struct ab8500_fg *di, int cap_mah)
1013 {
1014         u64 div_res;
1015         u32 div_rem;
1016
1017         div_res = ((u64) cap_mah) * ((u64) di->vbat_nom);
1018         div_rem = do_div(div_res, 1000);
1019
1020         /* Make sure to round upwards if necessary */
1021         if (div_rem >= 1000 / 2)
1022                 div_res++;
1023
1024         return (int) div_res;
1025 }
1026
1027 /**
1028  * ab8500_fg_calc_cap_charging() - Calculate remaining capacity while charging
1029  * @di:         pointer to the ab8500_fg structure
1030  *
1031  * Return the capacity in mAh based on previous calculated capcity and the FG
1032  * accumulator register value. The filter is filled with this capacity
1033  */
1034 static int ab8500_fg_calc_cap_charging(struct ab8500_fg *di)
1035 {
1036         dev_dbg(di->dev, "%s cap_mah %d accu_charge %d\n",
1037                 __func__,
1038                 di->bat_cap.mah,
1039                 di->accu_charge);
1040
1041         /* Capacity should not be less than 0 */
1042         if (di->bat_cap.mah + di->accu_charge > 0)
1043                 di->bat_cap.mah += di->accu_charge;
1044         else
1045                 di->bat_cap.mah = 0;
1046         /*
1047          * We force capacity to 100% once when the algorithm
1048          * reports that it's full.
1049          */
1050         if (di->bat_cap.mah >= di->bat_cap.max_mah_design ||
1051                 di->flags.force_full) {
1052                 di->bat_cap.mah = di->bat_cap.max_mah_design;
1053         }
1054
1055         ab8500_fg_fill_cap_sample(di, di->bat_cap.mah);
1056         di->bat_cap.permille =
1057                 ab8500_fg_convert_mah_to_permille(di, di->bat_cap.mah);
1058
1059         /* We need to update battery voltage and inst current when charging */
1060         di->vbat = ab8500_fg_bat_voltage(di);
1061         di->inst_curr = ab8500_fg_inst_curr_blocking(di);
1062
1063         return di->bat_cap.mah;
1064 }
1065
1066 /**
1067  * ab8500_fg_calc_cap_discharge_voltage() - Capacity in discharge with voltage
1068  * @di:         pointer to the ab8500_fg structure
1069  * @comp:       if voltage should be load compensated before capacity calc
1070  *
1071  * Return the capacity in mAh based on the battery voltage. The voltage can
1072  * either be load compensated or not. This value is added to the filter and a
1073  * new mean value is calculated and returned.
1074  */
1075 static int ab8500_fg_calc_cap_discharge_voltage(struct ab8500_fg *di, bool comp)
1076 {
1077         int permille, mah;
1078
1079         if (comp)
1080                 permille = ab8500_fg_load_comp_volt_to_capacity(di);
1081         else
1082                 permille = ab8500_fg_uncomp_volt_to_capacity(di);
1083
1084         mah = ab8500_fg_convert_permille_to_mah(di, permille);
1085
1086         di->bat_cap.mah = ab8500_fg_add_cap_sample(di, mah);
1087         di->bat_cap.permille =
1088                 ab8500_fg_convert_mah_to_permille(di, di->bat_cap.mah);
1089
1090         return di->bat_cap.mah;
1091 }
1092
1093 /**
1094  * ab8500_fg_calc_cap_discharge_fg() - Capacity in discharge with FG
1095  * @di:         pointer to the ab8500_fg structure
1096  *
1097  * Return the capacity in mAh based on previous calculated capcity and the FG
1098  * accumulator register value. This value is added to the filter and a
1099  * new mean value is calculated and returned.
1100  */
1101 static int ab8500_fg_calc_cap_discharge_fg(struct ab8500_fg *di)
1102 {
1103         int permille_volt, permille;
1104
1105         dev_dbg(di->dev, "%s cap_mah %d accu_charge %d\n",
1106                 __func__,
1107                 di->bat_cap.mah,
1108                 di->accu_charge);
1109
1110         /* Capacity should not be less than 0 */
1111         if (di->bat_cap.mah + di->accu_charge > 0)
1112                 di->bat_cap.mah += di->accu_charge;
1113         else
1114                 di->bat_cap.mah = 0;
1115
1116         if (di->bat_cap.mah >= di->bat_cap.max_mah_design)
1117                 di->bat_cap.mah = di->bat_cap.max_mah_design;
1118
1119         /*
1120          * Check against voltage based capacity. It can not be lower
1121          * than what the uncompensated voltage says
1122          */
1123         permille = ab8500_fg_convert_mah_to_permille(di, di->bat_cap.mah);
1124         permille_volt = ab8500_fg_uncomp_volt_to_capacity(di);
1125
1126         if (permille < permille_volt) {
1127                 di->bat_cap.permille = permille_volt;
1128                 di->bat_cap.mah = ab8500_fg_convert_permille_to_mah(di,
1129                         di->bat_cap.permille);
1130
1131                 dev_dbg(di->dev, "%s voltage based: perm %d perm_volt %d\n",
1132                         __func__,
1133                         permille,
1134                         permille_volt);
1135
1136                 ab8500_fg_fill_cap_sample(di, di->bat_cap.mah);
1137         } else {
1138                 ab8500_fg_fill_cap_sample(di, di->bat_cap.mah);
1139                 di->bat_cap.permille =
1140                         ab8500_fg_convert_mah_to_permille(di, di->bat_cap.mah);
1141         }
1142
1143         return di->bat_cap.mah;
1144 }
1145
1146 /**
1147  * ab8500_fg_capacity_level() - Get the battery capacity level
1148  * @di:         pointer to the ab8500_fg structure
1149  *
1150  * Get the battery capacity level based on the capacity in percent
1151  */
1152 static int ab8500_fg_capacity_level(struct ab8500_fg *di)
1153 {
1154         int ret, percent;
1155
1156         percent = DIV_ROUND_CLOSEST(di->bat_cap.permille, 10);
1157
1158         if (percent <= di->bm->cap_levels->critical ||
1159                 di->flags.low_bat)
1160                 ret = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
1161         else if (percent <= di->bm->cap_levels->low)
1162                 ret = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
1163         else if (percent <= di->bm->cap_levels->normal)
1164                 ret = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
1165         else if (percent <= di->bm->cap_levels->high)
1166                 ret = POWER_SUPPLY_CAPACITY_LEVEL_HIGH;
1167         else
1168                 ret = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
1169
1170         return ret;
1171 }
1172
1173 /**
1174  * ab8500_fg_calculate_scaled_capacity() - Capacity scaling
1175  * @di:         pointer to the ab8500_fg structure
1176  *
1177  * Calculates the capacity to be shown to upper layers. Scales the capacity
1178  * to have 100% as a reference from the actual capacity upon removal of charger
1179  * when charging is in maintenance mode.
1180  */
1181 static int ab8500_fg_calculate_scaled_capacity(struct ab8500_fg *di)
1182 {
1183         struct ab8500_fg_cap_scaling *cs = &di->bat_cap.cap_scale;
1184         int capacity = di->bat_cap.prev_percent;
1185
1186         if (!cs->enable)
1187                 return capacity;
1188
1189         /*
1190          * As long as we are in fully charge mode scale the capacity
1191          * to show 100%.
1192          */
1193         if (di->flags.fully_charged) {
1194                 cs->cap_to_scale[0] = 100;
1195                 cs->cap_to_scale[1] =
1196                         max(capacity, di->bm->fg_params->maint_thres);
1197                 dev_dbg(di->dev, "Scale cap with %d/%d\n",
1198                          cs->cap_to_scale[0], cs->cap_to_scale[1]);
1199         }
1200
1201         /* Calculates the scaled capacity. */
1202         if ((cs->cap_to_scale[0] != cs->cap_to_scale[1])
1203                                         && (cs->cap_to_scale[1] > 0))
1204                 capacity = min(100,
1205                                  DIV_ROUND_CLOSEST(di->bat_cap.prev_percent *
1206                                                  cs->cap_to_scale[0],
1207                                                  cs->cap_to_scale[1]));
1208
1209         if (di->flags.charging) {
1210                 if (capacity < cs->disable_cap_level) {
1211                         cs->disable_cap_level = capacity;
1212                         dev_dbg(di->dev, "Cap to stop scale lowered %d%%\n",
1213                                 cs->disable_cap_level);
1214                 } else if (!di->flags.fully_charged) {
1215                         if (di->bat_cap.prev_percent >=
1216                             cs->disable_cap_level) {
1217                                 dev_dbg(di->dev, "Disabling scaled capacity\n");
1218                                 cs->enable = false;
1219                                 capacity = di->bat_cap.prev_percent;
1220                         } else {
1221                                 dev_dbg(di->dev,
1222                                         "Waiting in cap to level %d%%\n",
1223                                         cs->disable_cap_level);
1224                                 capacity = cs->disable_cap_level;
1225                         }
1226                 }
1227         }
1228
1229         return capacity;
1230 }
1231
1232 /**
1233  * ab8500_fg_update_cap_scalers() - Capacity scaling
1234  * @di:         pointer to the ab8500_fg structure
1235  *
1236  * To be called when state change from charge<->discharge to update
1237  * the capacity scalers.
1238  */
1239 static void ab8500_fg_update_cap_scalers(struct ab8500_fg *di)
1240 {
1241         struct ab8500_fg_cap_scaling *cs = &di->bat_cap.cap_scale;
1242
1243         if (!cs->enable)
1244                 return;
1245         if (di->flags.charging) {
1246                 di->bat_cap.cap_scale.disable_cap_level =
1247                         di->bat_cap.cap_scale.scaled_cap;
1248                 dev_dbg(di->dev, "Cap to stop scale at charge %d%%\n",
1249                                 di->bat_cap.cap_scale.disable_cap_level);
1250         } else {
1251                 if (cs->scaled_cap != 100) {
1252                         cs->cap_to_scale[0] = cs->scaled_cap;
1253                         cs->cap_to_scale[1] = di->bat_cap.prev_percent;
1254                 } else {
1255                         cs->cap_to_scale[0] = 100;
1256                         cs->cap_to_scale[1] =
1257                                 max(di->bat_cap.prev_percent,
1258                                     di->bm->fg_params->maint_thres);
1259                 }
1260
1261                 dev_dbg(di->dev, "Cap to scale at discharge %d/%d\n",
1262                                 cs->cap_to_scale[0], cs->cap_to_scale[1]);
1263         }
1264 }
1265
1266 /**
1267  * ab8500_fg_check_capacity_limits() - Check if capacity has changed
1268  * @di:         pointer to the ab8500_fg structure
1269  * @init:       capacity is allowed to go up in init mode
1270  *
1271  * Check if capacity or capacity limit has changed and notify the system
1272  * about it using the power_supply framework
1273  */
1274 static void ab8500_fg_check_capacity_limits(struct ab8500_fg *di, bool init)
1275 {
1276         bool changed = false;
1277         int percent = DIV_ROUND_CLOSEST(di->bat_cap.permille, 10);
1278
1279         di->bat_cap.level = ab8500_fg_capacity_level(di);
1280
1281         if (di->bat_cap.level != di->bat_cap.prev_level) {
1282                 /*
1283                  * We do not allow reported capacity level to go up
1284                  * unless we're charging or if we're in init
1285                  */
1286                 if (!(!di->flags.charging && di->bat_cap.level >
1287                         di->bat_cap.prev_level) || init) {
1288                         dev_dbg(di->dev, "level changed from %d to %d\n",
1289                                 di->bat_cap.prev_level,
1290                                 di->bat_cap.level);
1291                         di->bat_cap.prev_level = di->bat_cap.level;
1292                         changed = true;
1293                 } else {
1294                         dev_dbg(di->dev, "level not allowed to go up "
1295                                 "since no charger is connected: %d to %d\n",
1296                                 di->bat_cap.prev_level,
1297                                 di->bat_cap.level);
1298                 }
1299         }
1300
1301         /*
1302          * If we have received the LOW_BAT IRQ, set capacity to 0 to initiate
1303          * shutdown
1304          */
1305         if (di->flags.low_bat) {
1306                 dev_dbg(di->dev, "Battery low, set capacity to 0\n");
1307                 di->bat_cap.prev_percent = 0;
1308                 di->bat_cap.permille = 0;
1309                 percent = 0;
1310                 di->bat_cap.prev_mah = 0;
1311                 di->bat_cap.mah = 0;
1312                 changed = true;
1313         } else if (di->flags.fully_charged) {
1314                 /*
1315                  * We report 100% if algorithm reported fully charged
1316                  * and show 100% during maintenance charging (scaling).
1317                  */
1318                 if (di->flags.force_full) {
1319                         di->bat_cap.prev_percent = percent;
1320                         di->bat_cap.prev_mah = di->bat_cap.mah;
1321
1322                         changed = true;
1323
1324                         if (!di->bat_cap.cap_scale.enable &&
1325                                                 di->bm->capacity_scaling) {
1326                                 di->bat_cap.cap_scale.enable = true;
1327                                 di->bat_cap.cap_scale.cap_to_scale[0] = 100;
1328                                 di->bat_cap.cap_scale.cap_to_scale[1] =
1329                                                 di->bat_cap.prev_percent;
1330                                 di->bat_cap.cap_scale.disable_cap_level = 100;
1331                         }
1332                 } else if (di->bat_cap.prev_percent != percent) {
1333                         dev_dbg(di->dev,
1334                                 "battery reported full "
1335                                 "but capacity dropping: %d\n",
1336                                 percent);
1337                         di->bat_cap.prev_percent = percent;
1338                         di->bat_cap.prev_mah = di->bat_cap.mah;
1339
1340                         changed = true;
1341                 }
1342         } else if (di->bat_cap.prev_percent != percent) {
1343                 if (percent == 0) {
1344                         /*
1345                          * We will not report 0% unless we've got
1346                          * the LOW_BAT IRQ, no matter what the FG
1347                          * algorithm says.
1348                          */
1349                         di->bat_cap.prev_percent = 1;
1350                         percent = 1;
1351
1352                         changed = true;
1353                 } else if (!(!di->flags.charging &&
1354                         percent > di->bat_cap.prev_percent) || init) {
1355                         /*
1356                          * We do not allow reported capacity to go up
1357                          * unless we're charging or if we're in init
1358                          */
1359                         dev_dbg(di->dev,
1360                                 "capacity changed from %d to %d (%d)\n",
1361                                 di->bat_cap.prev_percent,
1362                                 percent,
1363                                 di->bat_cap.permille);
1364                         di->bat_cap.prev_percent = percent;
1365                         di->bat_cap.prev_mah = di->bat_cap.mah;
1366
1367                         changed = true;
1368                 } else {
1369                         dev_dbg(di->dev, "capacity not allowed to go up since "
1370                                 "no charger is connected: %d to %d (%d)\n",
1371                                 di->bat_cap.prev_percent,
1372                                 percent,
1373                                 di->bat_cap.permille);
1374                 }
1375         }
1376
1377         if (changed) {
1378                 if (di->bm->capacity_scaling) {
1379                         di->bat_cap.cap_scale.scaled_cap =
1380                                 ab8500_fg_calculate_scaled_capacity(di);
1381
1382                         dev_info(di->dev, "capacity=%d (%d)\n",
1383                                 di->bat_cap.prev_percent,
1384                                 di->bat_cap.cap_scale.scaled_cap);
1385                 }
1386                 power_supply_changed(di->fg_psy);
1387                 if (di->flags.fully_charged && di->flags.force_full) {
1388                         dev_dbg(di->dev, "Battery full, notifying.\n");
1389                         di->flags.force_full = false;
1390                         sysfs_notify(&di->fg_kobject, NULL, "charge_full");
1391                 }
1392                 sysfs_notify(&di->fg_kobject, NULL, "charge_now");
1393         }
1394 }
1395
1396 static void ab8500_fg_charge_state_to(struct ab8500_fg *di,
1397         enum ab8500_fg_charge_state new_state)
1398 {
1399         dev_dbg(di->dev, "Charge state from %d [%s] to %d [%s]\n",
1400                 di->charge_state,
1401                 charge_state[di->charge_state],
1402                 new_state,
1403                 charge_state[new_state]);
1404
1405         di->charge_state = new_state;
1406 }
1407
1408 static void ab8500_fg_discharge_state_to(struct ab8500_fg *di,
1409         enum ab8500_fg_discharge_state new_state)
1410 {
1411         dev_dbg(di->dev, "Discharge state from %d [%s] to %d [%s]\n",
1412                 di->discharge_state,
1413                 discharge_state[di->discharge_state],
1414                 new_state,
1415                 discharge_state[new_state]);
1416
1417         di->discharge_state = new_state;
1418 }
1419
1420 /**
1421  * ab8500_fg_algorithm_charging() - FG algorithm for when charging
1422  * @di:         pointer to the ab8500_fg structure
1423  *
1424  * Battery capacity calculation state machine for when we're charging
1425  */
1426 static void ab8500_fg_algorithm_charging(struct ab8500_fg *di)
1427 {
1428         /*
1429          * If we change to discharge mode
1430          * we should start with recovery
1431          */
1432         if (di->discharge_state != AB8500_FG_DISCHARGE_INIT_RECOVERY)
1433                 ab8500_fg_discharge_state_to(di,
1434                         AB8500_FG_DISCHARGE_INIT_RECOVERY);
1435
1436         switch (di->charge_state) {
1437         case AB8500_FG_CHARGE_INIT:
1438                 di->fg_samples = SEC_TO_SAMPLE(
1439                         di->bm->fg_params->accu_charging);
1440
1441                 ab8500_fg_coulomb_counter(di, true);
1442                 ab8500_fg_charge_state_to(di, AB8500_FG_CHARGE_READOUT);
1443
1444                 break;
1445
1446         case AB8500_FG_CHARGE_READOUT:
1447                 /*
1448                  * Read the FG and calculate the new capacity
1449                  */
1450                 mutex_lock(&di->cc_lock);
1451                 if (!di->flags.conv_done && !di->flags.force_full) {
1452                         /* Wasn't the CC IRQ that got us here */
1453                         mutex_unlock(&di->cc_lock);
1454                         dev_dbg(di->dev, "%s CC conv not done\n",
1455                                 __func__);
1456
1457                         break;
1458                 }
1459                 di->flags.conv_done = false;
1460                 mutex_unlock(&di->cc_lock);
1461
1462                 ab8500_fg_calc_cap_charging(di);
1463
1464                 break;
1465
1466         default:
1467                 break;
1468         }
1469
1470         /* Check capacity limits */
1471         ab8500_fg_check_capacity_limits(di, false);
1472 }
1473
1474 static void force_capacity(struct ab8500_fg *di)
1475 {
1476         int cap;
1477
1478         ab8500_fg_clear_cap_samples(di);
1479         cap = di->bat_cap.user_mah;
1480         if (cap > di->bat_cap.max_mah_design) {
1481                 dev_dbg(di->dev, "Remaining cap %d can't be bigger than total"
1482                         " %d\n", cap, di->bat_cap.max_mah_design);
1483                 cap = di->bat_cap.max_mah_design;
1484         }
1485         ab8500_fg_fill_cap_sample(di, di->bat_cap.user_mah);
1486         di->bat_cap.permille = ab8500_fg_convert_mah_to_permille(di, cap);
1487         di->bat_cap.mah = cap;
1488         ab8500_fg_check_capacity_limits(di, true);
1489 }
1490
1491 static bool check_sysfs_capacity(struct ab8500_fg *di)
1492 {
1493         int cap, lower, upper;
1494         int cap_permille;
1495
1496         cap = di->bat_cap.user_mah;
1497
1498         cap_permille = ab8500_fg_convert_mah_to_permille(di,
1499                 di->bat_cap.user_mah);
1500
1501         lower = di->bat_cap.permille - di->bm->fg_params->user_cap_limit * 10;
1502         upper = di->bat_cap.permille + di->bm->fg_params->user_cap_limit * 10;
1503
1504         if (lower < 0)
1505                 lower = 0;
1506         /* 1000 is permille, -> 100 percent */
1507         if (upper > 1000)
1508                 upper = 1000;
1509
1510         dev_dbg(di->dev, "Capacity limits:"
1511                 " (Lower: %d User: %d Upper: %d) [user: %d, was: %d]\n",
1512                 lower, cap_permille, upper, cap, di->bat_cap.mah);
1513
1514         /* If within limits, use the saved capacity and exit estimation...*/
1515         if (cap_permille > lower && cap_permille < upper) {
1516                 dev_dbg(di->dev, "OK! Using users cap %d uAh now\n", cap);
1517                 force_capacity(di);
1518                 return true;
1519         }
1520         dev_dbg(di->dev, "Capacity from user out of limits, ignoring");
1521         return false;
1522 }
1523
1524 /**
1525  * ab8500_fg_algorithm_discharging() - FG algorithm for when discharging
1526  * @di:         pointer to the ab8500_fg structure
1527  *
1528  * Battery capacity calculation state machine for when we're discharging
1529  */
1530 static void ab8500_fg_algorithm_discharging(struct ab8500_fg *di)
1531 {
1532         int sleep_time;
1533
1534         /* If we change to charge mode we should start with init */
1535         if (di->charge_state != AB8500_FG_CHARGE_INIT)
1536                 ab8500_fg_charge_state_to(di, AB8500_FG_CHARGE_INIT);
1537
1538         switch (di->discharge_state) {
1539         case AB8500_FG_DISCHARGE_INIT:
1540                 /* We use the FG IRQ to work on */
1541                 di->init_cnt = 0;
1542                 di->fg_samples = SEC_TO_SAMPLE(di->bm->fg_params->init_timer);
1543                 ab8500_fg_coulomb_counter(di, true);
1544                 ab8500_fg_discharge_state_to(di,
1545                         AB8500_FG_DISCHARGE_INITMEASURING);
1546
1547                 fallthrough;
1548         case AB8500_FG_DISCHARGE_INITMEASURING:
1549                 /*
1550                  * Discard a number of samples during startup.
1551                  * After that, use compensated voltage for a few
1552                  * samples to get an initial capacity.
1553                  * Then go to READOUT
1554                  */
1555                 sleep_time = di->bm->fg_params->init_timer;
1556
1557                 /* Discard the first [x] seconds */
1558                 if (di->init_cnt > di->bm->fg_params->init_discard_time) {
1559                         ab8500_fg_calc_cap_discharge_voltage(di, true);
1560
1561                         ab8500_fg_check_capacity_limits(di, true);
1562                 }
1563
1564                 di->init_cnt += sleep_time;
1565                 if (di->init_cnt > di->bm->fg_params->init_total_time)
1566                         ab8500_fg_discharge_state_to(di,
1567                                 AB8500_FG_DISCHARGE_READOUT_INIT);
1568
1569                 break;
1570
1571         case AB8500_FG_DISCHARGE_INIT_RECOVERY:
1572                 di->recovery_cnt = 0;
1573                 di->recovery_needed = true;
1574                 ab8500_fg_discharge_state_to(di,
1575                         AB8500_FG_DISCHARGE_RECOVERY);
1576
1577                 fallthrough;
1578
1579         case AB8500_FG_DISCHARGE_RECOVERY:
1580                 sleep_time = di->bm->fg_params->recovery_sleep_timer;
1581
1582                 /*
1583                  * We should check the power consumption
1584                  * If low, go to READOUT (after x min) or
1585                  * RECOVERY_SLEEP if time left.
1586                  * If high, go to READOUT
1587                  */
1588                 di->inst_curr = ab8500_fg_inst_curr_blocking(di);
1589
1590                 if (ab8500_fg_is_low_curr(di, di->inst_curr)) {
1591                         if (di->recovery_cnt >
1592                                 di->bm->fg_params->recovery_total_time) {
1593                                 di->fg_samples = SEC_TO_SAMPLE(
1594                                         di->bm->fg_params->accu_high_curr);
1595                                 ab8500_fg_coulomb_counter(di, true);
1596                                 ab8500_fg_discharge_state_to(di,
1597                                         AB8500_FG_DISCHARGE_READOUT);
1598                                 di->recovery_needed = false;
1599                         } else {
1600                                 queue_delayed_work(di->fg_wq,
1601                                         &di->fg_periodic_work,
1602                                         sleep_time * HZ);
1603                         }
1604                         di->recovery_cnt += sleep_time;
1605                 } else {
1606                         di->fg_samples = SEC_TO_SAMPLE(
1607                                 di->bm->fg_params->accu_high_curr);
1608                         ab8500_fg_coulomb_counter(di, true);
1609                         ab8500_fg_discharge_state_to(di,
1610                                 AB8500_FG_DISCHARGE_READOUT);
1611                 }
1612                 break;
1613
1614         case AB8500_FG_DISCHARGE_READOUT_INIT:
1615                 di->fg_samples = SEC_TO_SAMPLE(
1616                         di->bm->fg_params->accu_high_curr);
1617                 ab8500_fg_coulomb_counter(di, true);
1618                 ab8500_fg_discharge_state_to(di,
1619                                 AB8500_FG_DISCHARGE_READOUT);
1620                 break;
1621
1622         case AB8500_FG_DISCHARGE_READOUT:
1623                 di->inst_curr = ab8500_fg_inst_curr_blocking(di);
1624
1625                 if (ab8500_fg_is_low_curr(di, di->inst_curr)) {
1626                         /* Detect mode change */
1627                         if (di->high_curr_mode) {
1628                                 di->high_curr_mode = false;
1629                                 di->high_curr_cnt = 0;
1630                         }
1631
1632                         if (di->recovery_needed) {
1633                                 ab8500_fg_discharge_state_to(di,
1634                                         AB8500_FG_DISCHARGE_INIT_RECOVERY);
1635
1636                                 queue_delayed_work(di->fg_wq,
1637                                         &di->fg_periodic_work, 0);
1638
1639                                 break;
1640                         }
1641
1642                         ab8500_fg_calc_cap_discharge_voltage(di, true);
1643                 } else {
1644                         mutex_lock(&di->cc_lock);
1645                         if (!di->flags.conv_done) {
1646                                 /* Wasn't the CC IRQ that got us here */
1647                                 mutex_unlock(&di->cc_lock);
1648                                 dev_dbg(di->dev, "%s CC conv not done\n",
1649                                         __func__);
1650
1651                                 break;
1652                         }
1653                         di->flags.conv_done = false;
1654                         mutex_unlock(&di->cc_lock);
1655
1656                         /* Detect mode change */
1657                         if (!di->high_curr_mode) {
1658                                 di->high_curr_mode = true;
1659                                 di->high_curr_cnt = 0;
1660                         }
1661
1662                         di->high_curr_cnt +=
1663                                 di->bm->fg_params->accu_high_curr;
1664                         if (di->high_curr_cnt >
1665                                 di->bm->fg_params->high_curr_time)
1666                                 di->recovery_needed = true;
1667
1668                         ab8500_fg_calc_cap_discharge_fg(di);
1669                 }
1670
1671                 ab8500_fg_check_capacity_limits(di, false);
1672
1673                 break;
1674
1675         case AB8500_FG_DISCHARGE_WAKEUP:
1676                 ab8500_fg_calc_cap_discharge_voltage(di, true);
1677
1678                 di->fg_samples = SEC_TO_SAMPLE(
1679                         di->bm->fg_params->accu_high_curr);
1680                 ab8500_fg_coulomb_counter(di, true);
1681                 ab8500_fg_discharge_state_to(di,
1682                                 AB8500_FG_DISCHARGE_READOUT);
1683
1684                 ab8500_fg_check_capacity_limits(di, false);
1685
1686                 break;
1687
1688         default:
1689                 break;
1690         }
1691 }
1692
1693 /**
1694  * ab8500_fg_algorithm_calibrate() - Internal columb counter offset calibration
1695  * @di:         pointer to the ab8500_fg structure
1696  *
1697  */
1698 static void ab8500_fg_algorithm_calibrate(struct ab8500_fg *di)
1699 {
1700         int ret;
1701
1702         switch (di->calib_state) {
1703         case AB8500_FG_CALIB_INIT:
1704                 dev_dbg(di->dev, "Calibration ongoing...\n");
1705
1706                 ret = abx500_mask_and_set_register_interruptible(di->dev,
1707                         AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG,
1708                         CC_INT_CAL_N_AVG_MASK, CC_INT_CAL_SAMPLES_8);
1709                 if (ret < 0)
1710                         goto err;
1711
1712                 ret = abx500_mask_and_set_register_interruptible(di->dev,
1713                         AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG,
1714                         CC_INTAVGOFFSET_ENA, CC_INTAVGOFFSET_ENA);
1715                 if (ret < 0)
1716                         goto err;
1717                 di->calib_state = AB8500_FG_CALIB_WAIT;
1718                 break;
1719         case AB8500_FG_CALIB_END:
1720                 ret = abx500_mask_and_set_register_interruptible(di->dev,
1721                         AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG,
1722                         CC_MUXOFFSET, CC_MUXOFFSET);
1723                 if (ret < 0)
1724                         goto err;
1725                 di->flags.calibrate = false;
1726                 dev_dbg(di->dev, "Calibration done...\n");
1727                 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
1728                 break;
1729         case AB8500_FG_CALIB_WAIT:
1730                 dev_dbg(di->dev, "Calibration WFI\n");
1731                 break;
1732         default:
1733                 break;
1734         }
1735         return;
1736 err:
1737         /* Something went wrong, don't calibrate then */
1738         dev_err(di->dev, "failed to calibrate the CC\n");
1739         di->flags.calibrate = false;
1740         di->calib_state = AB8500_FG_CALIB_INIT;
1741         queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
1742 }
1743
1744 /**
1745  * ab8500_fg_algorithm() - Entry point for the FG algorithm
1746  * @di:         pointer to the ab8500_fg structure
1747  *
1748  * Entry point for the battery capacity calculation state machine
1749  */
1750 static void ab8500_fg_algorithm(struct ab8500_fg *di)
1751 {
1752         if (di->flags.calibrate)
1753                 ab8500_fg_algorithm_calibrate(di);
1754         else {
1755                 if (di->flags.charging)
1756                         ab8500_fg_algorithm_charging(di);
1757                 else
1758                         ab8500_fg_algorithm_discharging(di);
1759         }
1760
1761         dev_dbg(di->dev, "[FG_DATA] %d %d %d %d %d %d %d %d %d %d "
1762                 "%d %d %d %d %d %d %d\n",
1763                 di->bat_cap.max_mah_design,
1764                 di->bat_cap.max_mah,
1765                 di->bat_cap.mah,
1766                 di->bat_cap.permille,
1767                 di->bat_cap.level,
1768                 di->bat_cap.prev_mah,
1769                 di->bat_cap.prev_percent,
1770                 di->bat_cap.prev_level,
1771                 di->vbat,
1772                 di->inst_curr,
1773                 di->avg_curr,
1774                 di->accu_charge,
1775                 di->flags.charging,
1776                 di->charge_state,
1777                 di->discharge_state,
1778                 di->high_curr_mode,
1779                 di->recovery_needed);
1780 }
1781
1782 /**
1783  * ab8500_fg_periodic_work() - Run the FG state machine periodically
1784  * @work:       pointer to the work_struct structure
1785  *
1786  * Work queue function for periodic work
1787  */
1788 static void ab8500_fg_periodic_work(struct work_struct *work)
1789 {
1790         struct ab8500_fg *di = container_of(work, struct ab8500_fg,
1791                 fg_periodic_work.work);
1792
1793         if (di->init_capacity) {
1794                 /* Get an initial capacity calculation */
1795                 ab8500_fg_calc_cap_discharge_voltage(di, true);
1796                 ab8500_fg_check_capacity_limits(di, true);
1797                 di->init_capacity = false;
1798
1799                 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
1800         } else if (di->flags.user_cap) {
1801                 if (check_sysfs_capacity(di)) {
1802                         ab8500_fg_check_capacity_limits(di, true);
1803                         if (di->flags.charging)
1804                                 ab8500_fg_charge_state_to(di,
1805                                         AB8500_FG_CHARGE_INIT);
1806                         else
1807                                 ab8500_fg_discharge_state_to(di,
1808                                         AB8500_FG_DISCHARGE_READOUT_INIT);
1809                 }
1810                 di->flags.user_cap = false;
1811                 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
1812         } else
1813                 ab8500_fg_algorithm(di);
1814
1815 }
1816
1817 /**
1818  * ab8500_fg_check_hw_failure_work() - Check OVV_BAT condition
1819  * @work:       pointer to the work_struct structure
1820  *
1821  * Work queue function for checking the OVV_BAT condition
1822  */
1823 static void ab8500_fg_check_hw_failure_work(struct work_struct *work)
1824 {
1825         int ret;
1826         u8 reg_value;
1827
1828         struct ab8500_fg *di = container_of(work, struct ab8500_fg,
1829                 fg_check_hw_failure_work.work);
1830
1831         /*
1832          * If we have had a battery over-voltage situation,
1833          * check ovv-bit to see if it should be reset.
1834          */
1835         ret = abx500_get_register_interruptible(di->dev,
1836                 AB8500_CHARGER, AB8500_CH_STAT_REG,
1837                 &reg_value);
1838         if (ret < 0) {
1839                 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
1840                 return;
1841         }
1842         if ((reg_value & BATT_OVV) == BATT_OVV) {
1843                 if (!di->flags.bat_ovv) {
1844                         dev_dbg(di->dev, "Battery OVV\n");
1845                         di->flags.bat_ovv = true;
1846                         power_supply_changed(di->fg_psy);
1847                 }
1848                 /* Not yet recovered from ovv, reschedule this test */
1849                 queue_delayed_work(di->fg_wq, &di->fg_check_hw_failure_work,
1850                                    HZ);
1851                 } else {
1852                         dev_dbg(di->dev, "Battery recovered from OVV\n");
1853                         di->flags.bat_ovv = false;
1854                         power_supply_changed(di->fg_psy);
1855         }
1856 }
1857
1858 /**
1859  * ab8500_fg_low_bat_work() - Check LOW_BAT condition
1860  * @work:       pointer to the work_struct structure
1861  *
1862  * Work queue function for checking the LOW_BAT condition
1863  */
1864 static void ab8500_fg_low_bat_work(struct work_struct *work)
1865 {
1866         int vbat;
1867
1868         struct ab8500_fg *di = container_of(work, struct ab8500_fg,
1869                 fg_low_bat_work.work);
1870
1871         vbat = ab8500_fg_bat_voltage(di);
1872
1873         /* Check if LOW_BAT still fulfilled */
1874         if (vbat < di->bm->fg_params->lowbat_threshold) {
1875                 /* Is it time to shut down? */
1876                 if (di->low_bat_cnt < 1) {
1877                         di->flags.low_bat = true;
1878                         dev_warn(di->dev, "Shut down pending...\n");
1879                 } else {
1880                         /*
1881                         * Else we need to re-schedule this check to be able to detect
1882                         * if the voltage increases again during charging or
1883                         * due to decreasing load.
1884                         */
1885                         di->low_bat_cnt--;
1886                         dev_warn(di->dev, "Battery voltage still LOW\n");
1887                         queue_delayed_work(di->fg_wq, &di->fg_low_bat_work,
1888                                 round_jiffies(LOW_BAT_CHECK_INTERVAL));
1889                 }
1890         } else {
1891                 di->flags.low_bat_delay = false;
1892                 di->low_bat_cnt = 10;
1893                 dev_warn(di->dev, "Battery voltage OK again\n");
1894         }
1895
1896         /* This is needed to dispatch LOW_BAT */
1897         ab8500_fg_check_capacity_limits(di, false);
1898 }
1899
1900 /**
1901  * ab8500_fg_battok_calc - calculate the bit pattern corresponding
1902  * to the target voltage.
1903  * @di:       pointer to the ab8500_fg structure
1904  * @target:   target voltage
1905  *
1906  * Returns bit pattern closest to the target voltage
1907  * valid return values are 0-14. (0-BATT_OK_MAX_NR_INCREMENTS)
1908  */
1909
1910 static int ab8500_fg_battok_calc(struct ab8500_fg *di, int target)
1911 {
1912         if (target > BATT_OK_MIN +
1913                 (BATT_OK_INCREMENT * BATT_OK_MAX_NR_INCREMENTS))
1914                 return BATT_OK_MAX_NR_INCREMENTS;
1915         if (target < BATT_OK_MIN)
1916                 return 0;
1917         return (target - BATT_OK_MIN) / BATT_OK_INCREMENT;
1918 }
1919
1920 /**
1921  * ab8500_fg_battok_init_hw_register - init battok levels
1922  * @di:       pointer to the ab8500_fg structure
1923  *
1924  */
1925
1926 static int ab8500_fg_battok_init_hw_register(struct ab8500_fg *di)
1927 {
1928         int selected;
1929         int sel0;
1930         int sel1;
1931         int cbp_sel0;
1932         int cbp_sel1;
1933         int ret;
1934         int new_val;
1935
1936         sel0 = di->bm->fg_params->battok_falling_th_sel0;
1937         sel1 = di->bm->fg_params->battok_raising_th_sel1;
1938
1939         cbp_sel0 = ab8500_fg_battok_calc(di, sel0);
1940         cbp_sel1 = ab8500_fg_battok_calc(di, sel1);
1941
1942         selected = BATT_OK_MIN + cbp_sel0 * BATT_OK_INCREMENT;
1943
1944         if (selected != sel0)
1945                 dev_warn(di->dev, "Invalid voltage step:%d, using %d %d\n",
1946                         sel0, selected, cbp_sel0);
1947
1948         selected = BATT_OK_MIN + cbp_sel1 * BATT_OK_INCREMENT;
1949
1950         if (selected != sel1)
1951                 dev_warn(di->dev, "Invalid voltage step:%d, using %d %d\n",
1952                         sel1, selected, cbp_sel1);
1953
1954         new_val = cbp_sel0 | (cbp_sel1 << 4);
1955
1956         dev_dbg(di->dev, "using: %x %d %d\n", new_val, cbp_sel0, cbp_sel1);
1957         ret = abx500_set_register_interruptible(di->dev, AB8500_SYS_CTRL2_BLOCK,
1958                 AB8500_BATT_OK_REG, new_val);
1959         return ret;
1960 }
1961
1962 /**
1963  * ab8500_fg_instant_work() - Run the FG state machine instantly
1964  * @work:       pointer to the work_struct structure
1965  *
1966  * Work queue function for instant work
1967  */
1968 static void ab8500_fg_instant_work(struct work_struct *work)
1969 {
1970         struct ab8500_fg *di = container_of(work, struct ab8500_fg, fg_work);
1971
1972         ab8500_fg_algorithm(di);
1973 }
1974
1975 /**
1976  * ab8500_fg_cc_data_end_handler() - end of data conversion isr.
1977  * @irq:       interrupt number
1978  * @_di:       pointer to the ab8500_fg structure
1979  *
1980  * Returns IRQ status(IRQ_HANDLED)
1981  */
1982 static irqreturn_t ab8500_fg_cc_data_end_handler(int irq, void *_di)
1983 {
1984         struct ab8500_fg *di = _di;
1985         if (!di->nbr_cceoc_irq_cnt) {
1986                 di->nbr_cceoc_irq_cnt++;
1987                 complete(&di->ab8500_fg_started);
1988         } else {
1989                 di->nbr_cceoc_irq_cnt = 0;
1990                 complete(&di->ab8500_fg_complete);
1991         }
1992         return IRQ_HANDLED;
1993 }
1994
1995 /**
1996  * ab8500_fg_cc_int_calib_handler () - end of calibration isr.
1997  * @irq:       interrupt number
1998  * @_di:       pointer to the ab8500_fg structure
1999  *
2000  * Returns IRQ status(IRQ_HANDLED)
2001  */
2002 static irqreturn_t ab8500_fg_cc_int_calib_handler(int irq, void *_di)
2003 {
2004         struct ab8500_fg *di = _di;
2005         di->calib_state = AB8500_FG_CALIB_END;
2006         queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
2007         return IRQ_HANDLED;
2008 }
2009
2010 /**
2011  * ab8500_fg_cc_convend_handler() - isr to get battery avg current.
2012  * @irq:       interrupt number
2013  * @_di:       pointer to the ab8500_fg structure
2014  *
2015  * Returns IRQ status(IRQ_HANDLED)
2016  */
2017 static irqreturn_t ab8500_fg_cc_convend_handler(int irq, void *_di)
2018 {
2019         struct ab8500_fg *di = _di;
2020
2021         queue_work(di->fg_wq, &di->fg_acc_cur_work);
2022
2023         return IRQ_HANDLED;
2024 }
2025
2026 /**
2027  * ab8500_fg_batt_ovv_handler() - Battery OVV occured
2028  * @irq:       interrupt number
2029  * @_di:       pointer to the ab8500_fg structure
2030  *
2031  * Returns IRQ status(IRQ_HANDLED)
2032  */
2033 static irqreturn_t ab8500_fg_batt_ovv_handler(int irq, void *_di)
2034 {
2035         struct ab8500_fg *di = _di;
2036
2037         dev_dbg(di->dev, "Battery OVV\n");
2038
2039         /* Schedule a new HW failure check */
2040         queue_delayed_work(di->fg_wq, &di->fg_check_hw_failure_work, 0);
2041
2042         return IRQ_HANDLED;
2043 }
2044
2045 /**
2046  * ab8500_fg_lowbatf_handler() - Battery voltage is below LOW threshold
2047  * @irq:       interrupt number
2048  * @_di:       pointer to the ab8500_fg structure
2049  *
2050  * Returns IRQ status(IRQ_HANDLED)
2051  */
2052 static irqreturn_t ab8500_fg_lowbatf_handler(int irq, void *_di)
2053 {
2054         struct ab8500_fg *di = _di;
2055
2056         /* Initiate handling in ab8500_fg_low_bat_work() if not already initiated. */
2057         if (!di->flags.low_bat_delay) {
2058                 dev_warn(di->dev, "Battery voltage is below LOW threshold\n");
2059                 di->flags.low_bat_delay = true;
2060                 /*
2061                  * Start a timer to check LOW_BAT again after some time
2062                  * This is done to avoid shutdown on single voltage dips
2063                  */
2064                 queue_delayed_work(di->fg_wq, &di->fg_low_bat_work,
2065                         round_jiffies(LOW_BAT_CHECK_INTERVAL));
2066         }
2067         return IRQ_HANDLED;
2068 }
2069
2070 /**
2071  * ab8500_fg_get_property() - get the fg properties
2072  * @psy:        pointer to the power_supply structure
2073  * @psp:        pointer to the power_supply_property structure
2074  * @val:        pointer to the power_supply_propval union
2075  *
2076  * This function gets called when an application tries to get the
2077  * fg properties by reading the sysfs files.
2078  * voltage_now:         battery voltage
2079  * current_now:         battery instant current
2080  * current_avg:         battery average current
2081  * charge_full_design:  capacity where battery is considered full
2082  * charge_now:          battery capacity in nAh
2083  * capacity:            capacity in percent
2084  * capacity_level:      capacity level
2085  *
2086  * Returns error code in case of failure else 0 on success
2087  */
2088 static int ab8500_fg_get_property(struct power_supply *psy,
2089         enum power_supply_property psp,
2090         union power_supply_propval *val)
2091 {
2092         struct ab8500_fg *di = power_supply_get_drvdata(psy);
2093
2094         /*
2095          * If battery is identified as unknown and charging of unknown
2096          * batteries is disabled, we always report 100% capacity and
2097          * capacity level UNKNOWN, since we can't calculate
2098          * remaining capacity
2099          */
2100
2101         switch (psp) {
2102         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
2103                 if (di->flags.bat_ovv)
2104                         val->intval = BATT_OVV_VALUE * 1000;
2105                 else
2106                         val->intval = di->vbat * 1000;
2107                 break;
2108         case POWER_SUPPLY_PROP_CURRENT_NOW:
2109                 val->intval = di->inst_curr * 1000;
2110                 break;
2111         case POWER_SUPPLY_PROP_CURRENT_AVG:
2112                 val->intval = di->avg_curr * 1000;
2113                 break;
2114         case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
2115                 val->intval = ab8500_fg_convert_mah_to_uwh(di,
2116                                 di->bat_cap.max_mah_design);
2117                 break;
2118         case POWER_SUPPLY_PROP_ENERGY_FULL:
2119                 val->intval = ab8500_fg_convert_mah_to_uwh(di,
2120                                 di->bat_cap.max_mah);
2121                 break;
2122         case POWER_SUPPLY_PROP_ENERGY_NOW:
2123                 if (di->flags.batt_unknown && !di->bm->chg_unknown_bat &&
2124                                 di->flags.batt_id_received)
2125                         val->intval = ab8500_fg_convert_mah_to_uwh(di,
2126                                         di->bat_cap.max_mah);
2127                 else
2128                         val->intval = ab8500_fg_convert_mah_to_uwh(di,
2129                                         di->bat_cap.prev_mah);
2130                 break;
2131         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
2132                 val->intval = di->bat_cap.max_mah_design;
2133                 break;
2134         case POWER_SUPPLY_PROP_CHARGE_FULL:
2135                 val->intval = di->bat_cap.max_mah;
2136                 break;
2137         case POWER_SUPPLY_PROP_CHARGE_NOW:
2138                 if (di->flags.batt_unknown && !di->bm->chg_unknown_bat &&
2139                                 di->flags.batt_id_received)
2140                         val->intval = di->bat_cap.max_mah;
2141                 else
2142                         val->intval = di->bat_cap.prev_mah;
2143                 break;
2144         case POWER_SUPPLY_PROP_CAPACITY:
2145                 if (di->flags.batt_unknown && !di->bm->chg_unknown_bat &&
2146                                 di->flags.batt_id_received)
2147                         val->intval = 100;
2148                 else
2149                         val->intval = di->bat_cap.prev_percent;
2150                 break;
2151         case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
2152                 if (di->flags.batt_unknown && !di->bm->chg_unknown_bat &&
2153                                 di->flags.batt_id_received)
2154                         val->intval = POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN;
2155                 else
2156                         val->intval = di->bat_cap.prev_level;
2157                 break;
2158         default:
2159                 return -EINVAL;
2160         }
2161         return 0;
2162 }
2163
2164 static int ab8500_fg_get_ext_psy_data(struct device *dev, void *data)
2165 {
2166         struct power_supply *psy;
2167         struct power_supply *ext = dev_get_drvdata(dev);
2168         const char **supplicants = (const char **)ext->supplied_to;
2169         struct ab8500_fg *di;
2170         union power_supply_propval ret;
2171         int j;
2172
2173         psy = (struct power_supply *)data;
2174         di = power_supply_get_drvdata(psy);
2175
2176         /*
2177          * For all psy where the name of your driver
2178          * appears in any supplied_to
2179          */
2180         j = match_string(supplicants, ext->num_supplicants, psy->desc->name);
2181         if (j < 0)
2182                 return 0;
2183
2184         /* Go through all properties for the psy */
2185         for (j = 0; j < ext->desc->num_properties; j++) {
2186                 enum power_supply_property prop;
2187                 prop = ext->desc->properties[j];
2188
2189                 if (power_supply_get_property(ext, prop, &ret))
2190                         continue;
2191
2192                 switch (prop) {
2193                 case POWER_SUPPLY_PROP_STATUS:
2194                         switch (ext->desc->type) {
2195                         case POWER_SUPPLY_TYPE_BATTERY:
2196                                 switch (ret.intval) {
2197                                 case POWER_SUPPLY_STATUS_UNKNOWN:
2198                                 case POWER_SUPPLY_STATUS_DISCHARGING:
2199                                 case POWER_SUPPLY_STATUS_NOT_CHARGING:
2200                                         if (!di->flags.charging)
2201                                                 break;
2202                                         di->flags.charging = false;
2203                                         di->flags.fully_charged = false;
2204                                         if (di->bm->capacity_scaling)
2205                                                 ab8500_fg_update_cap_scalers(di);
2206                                         queue_work(di->fg_wq, &di->fg_work);
2207                                         break;
2208                                 case POWER_SUPPLY_STATUS_FULL:
2209                                         if (di->flags.fully_charged)
2210                                                 break;
2211                                         di->flags.fully_charged = true;
2212                                         di->flags.force_full = true;
2213                                         /* Save current capacity as maximum */
2214                                         di->bat_cap.max_mah = di->bat_cap.mah;
2215                                         queue_work(di->fg_wq, &di->fg_work);
2216                                         break;
2217                                 case POWER_SUPPLY_STATUS_CHARGING:
2218                                         if (di->flags.charging &&
2219                                                 !di->flags.fully_charged)
2220                                                 break;
2221                                         di->flags.charging = true;
2222                                         di->flags.fully_charged = false;
2223                                         if (di->bm->capacity_scaling)
2224                                                 ab8500_fg_update_cap_scalers(di);
2225                                         queue_work(di->fg_wq, &di->fg_work);
2226                                         break;
2227                                 }
2228                                 break;
2229                         default:
2230                                 break;
2231                         }
2232                         break;
2233                 case POWER_SUPPLY_PROP_TECHNOLOGY:
2234                         switch (ext->desc->type) {
2235                         case POWER_SUPPLY_TYPE_BATTERY:
2236                                 if (!di->flags.batt_id_received &&
2237                                     di->bm->batt_id != BATTERY_UNKNOWN) {
2238                                         const struct abx500_battery_type *b;
2239
2240                                         b = &(di->bm->bat_type[di->bm->batt_id]);
2241
2242                                         di->flags.batt_id_received = true;
2243
2244                                         di->bat_cap.max_mah_design =
2245                                                 MILLI_TO_MICRO *
2246                                                 b->charge_full_design;
2247
2248                                         di->bat_cap.max_mah =
2249                                                 di->bat_cap.max_mah_design;
2250
2251                                         di->vbat_nom = b->nominal_voltage;
2252                                 }
2253
2254                                 if (ret.intval)
2255                                         di->flags.batt_unknown = false;
2256                                 else
2257                                         di->flags.batt_unknown = true;
2258                                 break;
2259                         default:
2260                                 break;
2261                         }
2262                         break;
2263                 case POWER_SUPPLY_PROP_TEMP:
2264                         switch (ext->desc->type) {
2265                         case POWER_SUPPLY_TYPE_BATTERY:
2266                                 if (di->flags.batt_id_received)
2267                                         di->bat_temp = ret.intval;
2268                                 break;
2269                         default:
2270                                 break;
2271                         }
2272                         break;
2273                 default:
2274                         break;
2275                 }
2276         }
2277         return 0;
2278 }
2279
2280 /**
2281  * ab8500_fg_init_hw_registers() - Set up FG related registers
2282  * @di:         pointer to the ab8500_fg structure
2283  *
2284  * Set up battery OVV, low battery voltage registers
2285  */
2286 static int ab8500_fg_init_hw_registers(struct ab8500_fg *di)
2287 {
2288         int ret;
2289
2290         /* Set VBAT OVV threshold */
2291         ret = abx500_mask_and_set_register_interruptible(di->dev,
2292                 AB8500_CHARGER,
2293                 AB8500_BATT_OVV,
2294                 BATT_OVV_TH_4P75,
2295                 BATT_OVV_TH_4P75);
2296         if (ret) {
2297                 dev_err(di->dev, "failed to set BATT_OVV\n");
2298                 goto out;
2299         }
2300
2301         /* Enable VBAT OVV detection */
2302         ret = abx500_mask_and_set_register_interruptible(di->dev,
2303                 AB8500_CHARGER,
2304                 AB8500_BATT_OVV,
2305                 BATT_OVV_ENA,
2306                 BATT_OVV_ENA);
2307         if (ret) {
2308                 dev_err(di->dev, "failed to enable BATT_OVV\n");
2309                 goto out;
2310         }
2311
2312         /* Low Battery Voltage */
2313         ret = abx500_set_register_interruptible(di->dev,
2314                 AB8500_SYS_CTRL2_BLOCK,
2315                 AB8500_LOW_BAT_REG,
2316                 ab8500_volt_to_regval(
2317                         di->bm->fg_params->lowbat_threshold) << 1 |
2318                 LOW_BAT_ENABLE);
2319         if (ret) {
2320                 dev_err(di->dev, "%s write failed\n", __func__);
2321                 goto out;
2322         }
2323
2324         /* Battery OK threshold */
2325         ret = ab8500_fg_battok_init_hw_register(di);
2326         if (ret) {
2327                 dev_err(di->dev, "BattOk init write failed.\n");
2328                 goto out;
2329         }
2330
2331         if (is_ab8505(di->parent)) {
2332                 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
2333                         AB8505_RTC_PCUT_MAX_TIME_REG, di->bm->fg_params->pcut_max_time);
2334
2335                 if (ret) {
2336                         dev_err(di->dev, "%s write failed AB8505_RTC_PCUT_MAX_TIME_REG\n", __func__);
2337                         goto out;
2338                 }
2339
2340                 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
2341                         AB8505_RTC_PCUT_FLAG_TIME_REG, di->bm->fg_params->pcut_flag_time);
2342
2343                 if (ret) {
2344                         dev_err(di->dev, "%s write failed AB8505_RTC_PCUT_FLAG_TIME_REG\n", __func__);
2345                         goto out;
2346                 }
2347
2348                 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
2349                         AB8505_RTC_PCUT_RESTART_REG, di->bm->fg_params->pcut_max_restart);
2350
2351                 if (ret) {
2352                         dev_err(di->dev, "%s write failed AB8505_RTC_PCUT_RESTART_REG\n", __func__);
2353                         goto out;
2354                 }
2355
2356                 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
2357                         AB8505_RTC_PCUT_DEBOUNCE_REG, di->bm->fg_params->pcut_debounce_time);
2358
2359                 if (ret) {
2360                         dev_err(di->dev, "%s write failed AB8505_RTC_PCUT_DEBOUNCE_REG\n", __func__);
2361                         goto out;
2362                 }
2363
2364                 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
2365                         AB8505_RTC_PCUT_CTL_STATUS_REG, di->bm->fg_params->pcut_enable);
2366
2367                 if (ret) {
2368                         dev_err(di->dev, "%s write failed AB8505_RTC_PCUT_CTL_STATUS_REG\n", __func__);
2369                         goto out;
2370                 }
2371         }
2372 out:
2373         return ret;
2374 }
2375
2376 /**
2377  * ab8500_fg_external_power_changed() - callback for power supply changes
2378  * @psy:       pointer to the structure power_supply
2379  *
2380  * This function is the entry point of the pointer external_power_changed
2381  * of the structure power_supply.
2382  * This function gets executed when there is a change in any external power
2383  * supply that this driver needs to be notified of.
2384  */
2385 static void ab8500_fg_external_power_changed(struct power_supply *psy)
2386 {
2387         struct ab8500_fg *di = power_supply_get_drvdata(psy);
2388
2389         class_for_each_device(power_supply_class, NULL,
2390                 di->fg_psy, ab8500_fg_get_ext_psy_data);
2391 }
2392
2393 /**
2394  * ab8500_fg_reinit_work() - work to reset the FG algorithm
2395  * @work:       pointer to the work_struct structure
2396  *
2397  * Used to reset the current battery capacity to be able to
2398  * retrigger a new voltage base capacity calculation. For
2399  * test and verification purpose.
2400  */
2401 static void ab8500_fg_reinit_work(struct work_struct *work)
2402 {
2403         struct ab8500_fg *di = container_of(work, struct ab8500_fg,
2404                 fg_reinit_work.work);
2405
2406         if (!di->flags.calibrate) {
2407                 dev_dbg(di->dev, "Resetting FG state machine to init.\n");
2408                 ab8500_fg_clear_cap_samples(di);
2409                 ab8500_fg_calc_cap_discharge_voltage(di, true);
2410                 ab8500_fg_charge_state_to(di, AB8500_FG_CHARGE_INIT);
2411                 ab8500_fg_discharge_state_to(di, AB8500_FG_DISCHARGE_INIT);
2412                 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
2413
2414         } else {
2415                 dev_err(di->dev, "Residual offset calibration ongoing "
2416                         "retrying..\n");
2417                 /* Wait one second until next try*/
2418                 queue_delayed_work(di->fg_wq, &di->fg_reinit_work,
2419                         round_jiffies(1));
2420         }
2421 }
2422
2423 /* Exposure to the sysfs interface */
2424
2425 struct ab8500_fg_sysfs_entry {
2426         struct attribute attr;
2427         ssize_t (*show)(struct ab8500_fg *, char *);
2428         ssize_t (*store)(struct ab8500_fg *, const char *, size_t);
2429 };
2430
2431 static ssize_t charge_full_show(struct ab8500_fg *di, char *buf)
2432 {
2433         return sprintf(buf, "%d\n", di->bat_cap.max_mah);
2434 }
2435
2436 static ssize_t charge_full_store(struct ab8500_fg *di, const char *buf,
2437                                  size_t count)
2438 {
2439         unsigned long charge_full;
2440         int ret;
2441
2442         ret = kstrtoul(buf, 10, &charge_full);
2443         if (ret)
2444                 return ret;
2445
2446         di->bat_cap.max_mah = (int) charge_full;
2447         return count;
2448 }
2449
2450 static ssize_t charge_now_show(struct ab8500_fg *di, char *buf)
2451 {
2452         return sprintf(buf, "%d\n", di->bat_cap.prev_mah);
2453 }
2454
2455 static ssize_t charge_now_store(struct ab8500_fg *di, const char *buf,
2456                                  size_t count)
2457 {
2458         unsigned long charge_now;
2459         int ret;
2460
2461         ret = kstrtoul(buf, 10, &charge_now);
2462         if (ret)
2463                 return ret;
2464
2465         di->bat_cap.user_mah = (int) charge_now;
2466         di->flags.user_cap = true;
2467         queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
2468         return count;
2469 }
2470
2471 static struct ab8500_fg_sysfs_entry charge_full_attr =
2472         __ATTR(charge_full, 0644, charge_full_show, charge_full_store);
2473
2474 static struct ab8500_fg_sysfs_entry charge_now_attr =
2475         __ATTR(charge_now, 0644, charge_now_show, charge_now_store);
2476
2477 static ssize_t
2478 ab8500_fg_show(struct kobject *kobj, struct attribute *attr, char *buf)
2479 {
2480         struct ab8500_fg_sysfs_entry *entry;
2481         struct ab8500_fg *di;
2482
2483         entry = container_of(attr, struct ab8500_fg_sysfs_entry, attr);
2484         di = container_of(kobj, struct ab8500_fg, fg_kobject);
2485
2486         if (!entry->show)
2487                 return -EIO;
2488
2489         return entry->show(di, buf);
2490 }
2491 static ssize_t
2492 ab8500_fg_store(struct kobject *kobj, struct attribute *attr, const char *buf,
2493                 size_t count)
2494 {
2495         struct ab8500_fg_sysfs_entry *entry;
2496         struct ab8500_fg *di;
2497
2498         entry = container_of(attr, struct ab8500_fg_sysfs_entry, attr);
2499         di = container_of(kobj, struct ab8500_fg, fg_kobject);
2500
2501         if (!entry->store)
2502                 return -EIO;
2503
2504         return entry->store(di, buf, count);
2505 }
2506
2507 static const struct sysfs_ops ab8500_fg_sysfs_ops = {
2508         .show = ab8500_fg_show,
2509         .store = ab8500_fg_store,
2510 };
2511
2512 static struct attribute *ab8500_fg_attrs[] = {
2513         &charge_full_attr.attr,
2514         &charge_now_attr.attr,
2515         NULL,
2516 };
2517
2518 static struct kobj_type ab8500_fg_ktype = {
2519         .sysfs_ops = &ab8500_fg_sysfs_ops,
2520         .default_attrs = ab8500_fg_attrs,
2521 };
2522
2523 /**
2524  * ab8500_fg_sysfs_exit() - de-init of sysfs entry
2525  * @di:                pointer to the struct ab8500_chargalg
2526  *
2527  * This function removes the entry in sysfs.
2528  */
2529 static void ab8500_fg_sysfs_exit(struct ab8500_fg *di)
2530 {
2531         kobject_del(&di->fg_kobject);
2532 }
2533
2534 /**
2535  * ab8500_fg_sysfs_init() - init of sysfs entry
2536  * @di:                pointer to the struct ab8500_chargalg
2537  *
2538  * This function adds an entry in sysfs.
2539  * Returns error code in case of failure else 0(on success)
2540  */
2541 static int ab8500_fg_sysfs_init(struct ab8500_fg *di)
2542 {
2543         int ret = 0;
2544
2545         ret = kobject_init_and_add(&di->fg_kobject,
2546                 &ab8500_fg_ktype,
2547                 NULL, "battery");
2548         if (ret < 0)
2549                 dev_err(di->dev, "failed to create sysfs entry\n");
2550
2551         return ret;
2552 }
2553
2554 static ssize_t ab8505_powercut_flagtime_read(struct device *dev,
2555                              struct device_attribute *attr,
2556                              char *buf)
2557 {
2558         int ret;
2559         u8 reg_value;
2560         struct power_supply *psy = dev_get_drvdata(dev);
2561         struct ab8500_fg *di = power_supply_get_drvdata(psy);
2562
2563         ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
2564                 AB8505_RTC_PCUT_FLAG_TIME_REG, &reg_value);
2565
2566         if (ret < 0) {
2567                 dev_err(dev, "Failed to read AB8505_RTC_PCUT_FLAG_TIME_REG\n");
2568                 goto fail;
2569         }
2570
2571         return scnprintf(buf, PAGE_SIZE, "%d\n", (reg_value & 0x7F));
2572
2573 fail:
2574         return ret;
2575 }
2576
2577 static ssize_t ab8505_powercut_flagtime_write(struct device *dev,
2578                                   struct device_attribute *attr,
2579                                   const char *buf, size_t count)
2580 {
2581         int ret;
2582         int reg_value;
2583         struct power_supply *psy = dev_get_drvdata(dev);
2584         struct ab8500_fg *di = power_supply_get_drvdata(psy);
2585
2586         if (kstrtoint(buf, 10, &reg_value))
2587                 goto fail;
2588
2589         if (reg_value > 0x7F) {
2590                 dev_err(dev, "Incorrect parameter, echo 0 (1.98s) - 127 (15.625ms) for flagtime\n");
2591                 goto fail;
2592         }
2593
2594         ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
2595                 AB8505_RTC_PCUT_FLAG_TIME_REG, (u8)reg_value);
2596
2597         if (ret < 0)
2598                 dev_err(dev, "Failed to set AB8505_RTC_PCUT_FLAG_TIME_REG\n");
2599
2600 fail:
2601         return count;
2602 }
2603
2604 static ssize_t ab8505_powercut_maxtime_read(struct device *dev,
2605                              struct device_attribute *attr,
2606                              char *buf)
2607 {
2608         int ret;
2609         u8 reg_value;
2610         struct power_supply *psy = dev_get_drvdata(dev);
2611         struct ab8500_fg *di = power_supply_get_drvdata(psy);
2612
2613         ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
2614                 AB8505_RTC_PCUT_MAX_TIME_REG, &reg_value);
2615
2616         if (ret < 0) {
2617                 dev_err(dev, "Failed to read AB8505_RTC_PCUT_MAX_TIME_REG\n");
2618                 goto fail;
2619         }
2620
2621         return scnprintf(buf, PAGE_SIZE, "%d\n", (reg_value & 0x7F));
2622
2623 fail:
2624         return ret;
2625
2626 }
2627
2628 static ssize_t ab8505_powercut_maxtime_write(struct device *dev,
2629                                   struct device_attribute *attr,
2630                                   const char *buf, size_t count)
2631 {
2632         int ret;
2633         int reg_value;
2634         struct power_supply *psy = dev_get_drvdata(dev);
2635         struct ab8500_fg *di = power_supply_get_drvdata(psy);
2636
2637         if (kstrtoint(buf, 10, &reg_value))
2638                 goto fail;
2639
2640         if (reg_value > 0x7F) {
2641                 dev_err(dev, "Incorrect parameter, echo 0 (0.0s) - 127 (1.98s) for maxtime\n");
2642                 goto fail;
2643         }
2644
2645         ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
2646                 AB8505_RTC_PCUT_MAX_TIME_REG, (u8)reg_value);
2647
2648         if (ret < 0)
2649                 dev_err(dev, "Failed to set AB8505_RTC_PCUT_MAX_TIME_REG\n");
2650
2651 fail:
2652         return count;
2653 }
2654
2655 static ssize_t ab8505_powercut_restart_read(struct device *dev,
2656                              struct device_attribute *attr,
2657                              char *buf)
2658 {
2659         int ret;
2660         u8 reg_value;
2661         struct power_supply *psy = dev_get_drvdata(dev);
2662         struct ab8500_fg *di = power_supply_get_drvdata(psy);
2663
2664         ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
2665                 AB8505_RTC_PCUT_RESTART_REG, &reg_value);
2666
2667         if (ret < 0) {
2668                 dev_err(dev, "Failed to read AB8505_RTC_PCUT_RESTART_REG\n");
2669                 goto fail;
2670         }
2671
2672         return scnprintf(buf, PAGE_SIZE, "%d\n", (reg_value & 0xF));
2673
2674 fail:
2675         return ret;
2676 }
2677
2678 static ssize_t ab8505_powercut_restart_write(struct device *dev,
2679                                              struct device_attribute *attr,
2680                                              const char *buf, size_t count)
2681 {
2682         int ret;
2683         int reg_value;
2684         struct power_supply *psy = dev_get_drvdata(dev);
2685         struct ab8500_fg *di = power_supply_get_drvdata(psy);
2686
2687         if (kstrtoint(buf, 10, &reg_value))
2688                 goto fail;
2689
2690         if (reg_value > 0xF) {
2691                 dev_err(dev, "Incorrect parameter, echo 0 - 15 for number of restart\n");
2692                 goto fail;
2693         }
2694
2695         ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
2696                                                 AB8505_RTC_PCUT_RESTART_REG, (u8)reg_value);
2697
2698         if (ret < 0)
2699                 dev_err(dev, "Failed to set AB8505_RTC_PCUT_RESTART_REG\n");
2700
2701 fail:
2702         return count;
2703
2704 }
2705
2706 static ssize_t ab8505_powercut_timer_read(struct device *dev,
2707                                           struct device_attribute *attr,
2708                                           char *buf)
2709 {
2710         int ret;
2711         u8 reg_value;
2712         struct power_supply *psy = dev_get_drvdata(dev);
2713         struct ab8500_fg *di = power_supply_get_drvdata(psy);
2714
2715         ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
2716                                                 AB8505_RTC_PCUT_TIME_REG, &reg_value);
2717
2718         if (ret < 0) {
2719                 dev_err(dev, "Failed to read AB8505_RTC_PCUT_TIME_REG\n");
2720                 goto fail;
2721         }
2722
2723         return scnprintf(buf, PAGE_SIZE, "%d\n", (reg_value & 0x7F));
2724
2725 fail:
2726         return ret;
2727 }
2728
2729 static ssize_t ab8505_powercut_restart_counter_read(struct device *dev,
2730                                                     struct device_attribute *attr,
2731                                                     char *buf)
2732 {
2733         int ret;
2734         u8 reg_value;
2735         struct power_supply *psy = dev_get_drvdata(dev);
2736         struct ab8500_fg *di = power_supply_get_drvdata(psy);
2737
2738         ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
2739                                                 AB8505_RTC_PCUT_RESTART_REG, &reg_value);
2740
2741         if (ret < 0) {
2742                 dev_err(dev, "Failed to read AB8505_RTC_PCUT_RESTART_REG\n");
2743                 goto fail;
2744         }
2745
2746         return scnprintf(buf, PAGE_SIZE, "%d\n", (reg_value & 0xF0) >> 4);
2747
2748 fail:
2749         return ret;
2750 }
2751
2752 static ssize_t ab8505_powercut_read(struct device *dev,
2753                                     struct device_attribute *attr,
2754                                     char *buf)
2755 {
2756         int ret;
2757         u8 reg_value;
2758         struct power_supply *psy = dev_get_drvdata(dev);
2759         struct ab8500_fg *di = power_supply_get_drvdata(psy);
2760
2761         ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
2762                                                 AB8505_RTC_PCUT_CTL_STATUS_REG, &reg_value);
2763
2764         if (ret < 0)
2765                 goto fail;
2766
2767         return scnprintf(buf, PAGE_SIZE, "%d\n", (reg_value & 0x1));
2768
2769 fail:
2770         return ret;
2771 }
2772
2773 static ssize_t ab8505_powercut_write(struct device *dev,
2774                                      struct device_attribute *attr,
2775                                      const char *buf, size_t count)
2776 {
2777         int ret;
2778         int reg_value;
2779         struct power_supply *psy = dev_get_drvdata(dev);
2780         struct ab8500_fg *di = power_supply_get_drvdata(psy);
2781
2782         if (kstrtoint(buf, 10, &reg_value))
2783                 goto fail;
2784
2785         if (reg_value > 0x1) {
2786                 dev_err(dev, "Incorrect parameter, echo 0/1 to disable/enable Pcut feature\n");
2787                 goto fail;
2788         }
2789
2790         ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
2791                                                 AB8505_RTC_PCUT_CTL_STATUS_REG, (u8)reg_value);
2792
2793         if (ret < 0)
2794                 dev_err(dev, "Failed to set AB8505_RTC_PCUT_CTL_STATUS_REG\n");
2795
2796 fail:
2797         return count;
2798 }
2799
2800 static ssize_t ab8505_powercut_flag_read(struct device *dev,
2801                                          struct device_attribute *attr,
2802                                          char *buf)
2803 {
2804
2805         int ret;
2806         u8 reg_value;
2807         struct power_supply *psy = dev_get_drvdata(dev);
2808         struct ab8500_fg *di = power_supply_get_drvdata(psy);
2809
2810         ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
2811                                                 AB8505_RTC_PCUT_CTL_STATUS_REG,  &reg_value);
2812
2813         if (ret < 0) {
2814                 dev_err(dev, "Failed to read AB8505_RTC_PCUT_CTL_STATUS_REG\n");
2815                 goto fail;
2816         }
2817
2818         return scnprintf(buf, PAGE_SIZE, "%d\n", ((reg_value & 0x10) >> 4));
2819
2820 fail:
2821         return ret;
2822 }
2823
2824 static ssize_t ab8505_powercut_debounce_read(struct device *dev,
2825                                              struct device_attribute *attr,
2826                                              char *buf)
2827 {
2828         int ret;
2829         u8 reg_value;
2830         struct power_supply *psy = dev_get_drvdata(dev);
2831         struct ab8500_fg *di = power_supply_get_drvdata(psy);
2832
2833         ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
2834                                                 AB8505_RTC_PCUT_DEBOUNCE_REG,  &reg_value);
2835
2836         if (ret < 0) {
2837                 dev_err(dev, "Failed to read AB8505_RTC_PCUT_DEBOUNCE_REG\n");
2838                 goto fail;
2839         }
2840
2841         return scnprintf(buf, PAGE_SIZE, "%d\n", (reg_value & 0x7));
2842
2843 fail:
2844         return ret;
2845 }
2846
2847 static ssize_t ab8505_powercut_debounce_write(struct device *dev,
2848                                               struct device_attribute *attr,
2849                                               const char *buf, size_t count)
2850 {
2851         int ret;
2852         int reg_value;
2853         struct power_supply *psy = dev_get_drvdata(dev);
2854         struct ab8500_fg *di = power_supply_get_drvdata(psy);
2855
2856         if (kstrtoint(buf, 10, &reg_value))
2857                 goto fail;
2858
2859         if (reg_value > 0x7) {
2860                 dev_err(dev, "Incorrect parameter, echo 0 to 7 for debounce setting\n");
2861                 goto fail;
2862         }
2863
2864         ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
2865                                                 AB8505_RTC_PCUT_DEBOUNCE_REG, (u8)reg_value);
2866
2867         if (ret < 0)
2868                 dev_err(dev, "Failed to set AB8505_RTC_PCUT_DEBOUNCE_REG\n");
2869
2870 fail:
2871         return count;
2872 }
2873
2874 static ssize_t ab8505_powercut_enable_status_read(struct device *dev,
2875                                                   struct device_attribute *attr,
2876                                                   char *buf)
2877 {
2878         int ret;
2879         u8 reg_value;
2880         struct power_supply *psy = dev_get_drvdata(dev);
2881         struct ab8500_fg *di = power_supply_get_drvdata(psy);
2882
2883         ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
2884                                                 AB8505_RTC_PCUT_CTL_STATUS_REG, &reg_value);
2885
2886         if (ret < 0) {
2887                 dev_err(dev, "Failed to read AB8505_RTC_PCUT_CTL_STATUS_REG\n");
2888                 goto fail;
2889         }
2890
2891         return scnprintf(buf, PAGE_SIZE, "%d\n", ((reg_value & 0x20) >> 5));
2892
2893 fail:
2894         return ret;
2895 }
2896
2897 static struct device_attribute ab8505_fg_sysfs_psy_attrs[] = {
2898         __ATTR(powercut_flagtime, (S_IRUGO | S_IWUSR | S_IWGRP),
2899                 ab8505_powercut_flagtime_read, ab8505_powercut_flagtime_write),
2900         __ATTR(powercut_maxtime, (S_IRUGO | S_IWUSR | S_IWGRP),
2901                 ab8505_powercut_maxtime_read, ab8505_powercut_maxtime_write),
2902         __ATTR(powercut_restart_max, (S_IRUGO | S_IWUSR | S_IWGRP),
2903                 ab8505_powercut_restart_read, ab8505_powercut_restart_write),
2904         __ATTR(powercut_timer, S_IRUGO, ab8505_powercut_timer_read, NULL),
2905         __ATTR(powercut_restart_counter, S_IRUGO,
2906                 ab8505_powercut_restart_counter_read, NULL),
2907         __ATTR(powercut_enable, (S_IRUGO | S_IWUSR | S_IWGRP),
2908                 ab8505_powercut_read, ab8505_powercut_write),
2909         __ATTR(powercut_flag, S_IRUGO, ab8505_powercut_flag_read, NULL),
2910         __ATTR(powercut_debounce_time, (S_IRUGO | S_IWUSR | S_IWGRP),
2911                 ab8505_powercut_debounce_read, ab8505_powercut_debounce_write),
2912         __ATTR(powercut_enable_status, S_IRUGO,
2913                 ab8505_powercut_enable_status_read, NULL),
2914 };
2915
2916 static int ab8500_fg_sysfs_psy_create_attrs(struct ab8500_fg *di)
2917 {
2918         unsigned int i;
2919
2920         if (is_ab8505(di->parent)) {
2921                 for (i = 0; i < ARRAY_SIZE(ab8505_fg_sysfs_psy_attrs); i++)
2922                         if (device_create_file(&di->fg_psy->dev,
2923                                                &ab8505_fg_sysfs_psy_attrs[i]))
2924                                 goto sysfs_psy_create_attrs_failed_ab8505;
2925         }
2926         return 0;
2927 sysfs_psy_create_attrs_failed_ab8505:
2928         dev_err(&di->fg_psy->dev, "Failed creating sysfs psy attrs for ab8505.\n");
2929         while (i--)
2930                 device_remove_file(&di->fg_psy->dev,
2931                                    &ab8505_fg_sysfs_psy_attrs[i]);
2932
2933         return -EIO;
2934 }
2935
2936 static void ab8500_fg_sysfs_psy_remove_attrs(struct ab8500_fg *di)
2937 {
2938         unsigned int i;
2939
2940         if (is_ab8505(di->parent)) {
2941                 for (i = 0; i < ARRAY_SIZE(ab8505_fg_sysfs_psy_attrs); i++)
2942                         (void)device_remove_file(&di->fg_psy->dev,
2943                                                  &ab8505_fg_sysfs_psy_attrs[i]);
2944         }
2945 }
2946
2947 /* Exposure to the sysfs interface <<END>> */
2948
2949 static int __maybe_unused ab8500_fg_resume(struct device *dev)
2950 {
2951         struct ab8500_fg *di = dev_get_drvdata(dev);
2952
2953         /*
2954          * Change state if we're not charging. If we're charging we will wake
2955          * up on the FG IRQ
2956          */
2957         if (!di->flags.charging) {
2958                 ab8500_fg_discharge_state_to(di, AB8500_FG_DISCHARGE_WAKEUP);
2959                 queue_work(di->fg_wq, &di->fg_work);
2960         }
2961
2962         return 0;
2963 }
2964
2965 static int __maybe_unused ab8500_fg_suspend(struct device *dev)
2966 {
2967         struct ab8500_fg *di = dev_get_drvdata(dev);
2968
2969         flush_delayed_work(&di->fg_periodic_work);
2970         flush_work(&di->fg_work);
2971         flush_work(&di->fg_acc_cur_work);
2972         flush_delayed_work(&di->fg_reinit_work);
2973         flush_delayed_work(&di->fg_low_bat_work);
2974         flush_delayed_work(&di->fg_check_hw_failure_work);
2975
2976         /*
2977          * If the FG is enabled we will disable it before going to suspend
2978          * only if we're not charging
2979          */
2980         if (di->flags.fg_enabled && !di->flags.charging)
2981                 ab8500_fg_coulomb_counter(di, false);
2982
2983         return 0;
2984 }
2985
2986 /* ab8500 fg driver interrupts and their respective isr */
2987 static struct ab8500_fg_interrupts ab8500_fg_irq[] = {
2988         {"NCONV_ACCU", ab8500_fg_cc_convend_handler},
2989         {"BATT_OVV", ab8500_fg_batt_ovv_handler},
2990         {"LOW_BAT_F", ab8500_fg_lowbatf_handler},
2991         {"CC_INT_CALIB", ab8500_fg_cc_int_calib_handler},
2992         {"CCEOC", ab8500_fg_cc_data_end_handler},
2993 };
2994
2995 static char *supply_interface[] = {
2996         "ab8500_chargalg",
2997         "ab8500_usb",
2998 };
2999
3000 static const struct power_supply_desc ab8500_fg_desc = {
3001         .name                   = "ab8500_fg",
3002         .type                   = POWER_SUPPLY_TYPE_BATTERY,
3003         .properties             = ab8500_fg_props,
3004         .num_properties         = ARRAY_SIZE(ab8500_fg_props),
3005         .get_property           = ab8500_fg_get_property,
3006         .external_power_changed = ab8500_fg_external_power_changed,
3007 };
3008
3009 static int ab8500_fg_bind(struct device *dev, struct device *master,
3010                           void *data)
3011 {
3012         struct ab8500_fg *di = dev_get_drvdata(dev);
3013
3014         /* Create a work queue for running the FG algorithm */
3015         di->fg_wq = alloc_ordered_workqueue("ab8500_fg_wq", WQ_MEM_RECLAIM);
3016         if (di->fg_wq == NULL) {
3017                 dev_err(dev, "failed to create work queue\n");
3018                 return -ENOMEM;
3019         }
3020
3021         /* Start the coulomb counter */
3022         ab8500_fg_coulomb_counter(di, true);
3023         /* Run the FG algorithm */
3024         queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
3025
3026         return 0;
3027 }
3028
3029 static void ab8500_fg_unbind(struct device *dev, struct device *master,
3030                              void *data)
3031 {
3032         struct ab8500_fg *di = dev_get_drvdata(dev);
3033         int ret;
3034
3035         /* Disable coulomb counter */
3036         ret = ab8500_fg_coulomb_counter(di, false);
3037         if (ret)
3038                 dev_err(dev, "failed to disable coulomb counter\n");
3039
3040         destroy_workqueue(di->fg_wq);
3041         flush_scheduled_work();
3042 }
3043
3044 static const struct component_ops ab8500_fg_component_ops = {
3045         .bind = ab8500_fg_bind,
3046         .unbind = ab8500_fg_unbind,
3047 };
3048
3049 static int ab8500_fg_probe(struct platform_device *pdev)
3050 {
3051         struct device *dev = &pdev->dev;
3052         struct power_supply_config psy_cfg = {};
3053         struct ab8500_fg *di;
3054         int i, irq;
3055         int ret = 0;
3056
3057         di = devm_kzalloc(dev, sizeof(*di), GFP_KERNEL);
3058         if (!di)
3059                 return -ENOMEM;
3060
3061         di->bm = &ab8500_bm_data;
3062
3063         mutex_init(&di->cc_lock);
3064
3065         /* get parent data */
3066         di->dev = dev;
3067         di->parent = dev_get_drvdata(pdev->dev.parent);
3068
3069         di->main_bat_v = devm_iio_channel_get(dev, "main_bat_v");
3070         if (IS_ERR(di->main_bat_v)) {
3071                 ret = dev_err_probe(dev, PTR_ERR(di->main_bat_v),
3072                                     "failed to get main battery ADC channel\n");
3073                 return ret;
3074         }
3075
3076         psy_cfg.supplied_to = supply_interface;
3077         psy_cfg.num_supplicants = ARRAY_SIZE(supply_interface);
3078         psy_cfg.drv_data = di;
3079
3080         di->bat_cap.max_mah_design = MILLI_TO_MICRO *
3081                 di->bm->bat_type[di->bm->batt_id].charge_full_design;
3082
3083         di->bat_cap.max_mah = di->bat_cap.max_mah_design;
3084
3085         di->vbat_nom = di->bm->bat_type[di->bm->batt_id].nominal_voltage;
3086
3087         di->init_capacity = true;
3088
3089         ab8500_fg_charge_state_to(di, AB8500_FG_CHARGE_INIT);
3090         ab8500_fg_discharge_state_to(di, AB8500_FG_DISCHARGE_INIT);
3091
3092         /* Init work for running the fg algorithm instantly */
3093         INIT_WORK(&di->fg_work, ab8500_fg_instant_work);
3094
3095         /* Init work for getting the battery accumulated current */
3096         INIT_WORK(&di->fg_acc_cur_work, ab8500_fg_acc_cur_work);
3097
3098         /* Init work for reinitialising the fg algorithm */
3099         INIT_DEFERRABLE_WORK(&di->fg_reinit_work,
3100                 ab8500_fg_reinit_work);
3101
3102         /* Work delayed Queue to run the state machine */
3103         INIT_DEFERRABLE_WORK(&di->fg_periodic_work,
3104                 ab8500_fg_periodic_work);
3105
3106         /* Work to check low battery condition */
3107         INIT_DEFERRABLE_WORK(&di->fg_low_bat_work,
3108                 ab8500_fg_low_bat_work);
3109
3110         /* Init work for HW failure check */
3111         INIT_DEFERRABLE_WORK(&di->fg_check_hw_failure_work,
3112                 ab8500_fg_check_hw_failure_work);
3113
3114         /* Reset battery low voltage flag */
3115         di->flags.low_bat = false;
3116
3117         /* Initialize low battery counter */
3118         di->low_bat_cnt = 10;
3119
3120         /* Initialize OVV, and other registers */
3121         ret = ab8500_fg_init_hw_registers(di);
3122         if (ret) {
3123                 dev_err(dev, "failed to initialize registers\n");
3124                 return ret;
3125         }
3126
3127         /* Consider battery unknown until we're informed otherwise */
3128         di->flags.batt_unknown = true;
3129         di->flags.batt_id_received = false;
3130
3131         /* Register FG power supply class */
3132         di->fg_psy = devm_power_supply_register(dev, &ab8500_fg_desc, &psy_cfg);
3133         if (IS_ERR(di->fg_psy)) {
3134                 dev_err(dev, "failed to register FG psy\n");
3135                 return PTR_ERR(di->fg_psy);
3136         }
3137
3138         di->fg_samples = SEC_TO_SAMPLE(di->bm->fg_params->init_timer);
3139
3140         /*
3141          * Initialize completion used to notify completion and start
3142          * of inst current
3143          */
3144         init_completion(&di->ab8500_fg_started);
3145         init_completion(&di->ab8500_fg_complete);
3146
3147         /* Register primary interrupt handlers */
3148         for (i = 0; i < ARRAY_SIZE(ab8500_fg_irq); i++) {
3149                 irq = platform_get_irq_byname(pdev, ab8500_fg_irq[i].name);
3150                 if (irq < 0)
3151                         return irq;
3152
3153                 ret = devm_request_threaded_irq(dev, irq, NULL,
3154                                   ab8500_fg_irq[i].isr,
3155                                   IRQF_SHARED | IRQF_NO_SUSPEND | IRQF_ONESHOT,
3156                                   ab8500_fg_irq[i].name, di);
3157
3158                 if (ret != 0) {
3159                         dev_err(dev, "failed to request %s IRQ %d: %d\n",
3160                                 ab8500_fg_irq[i].name, irq, ret);
3161                         return ret;
3162                 }
3163                 dev_dbg(dev, "Requested %s IRQ %d: %d\n",
3164                         ab8500_fg_irq[i].name, irq, ret);
3165         }
3166
3167         di->irq = platform_get_irq_byname(pdev, "CCEOC");
3168         disable_irq(di->irq);
3169         di->nbr_cceoc_irq_cnt = 0;
3170
3171         platform_set_drvdata(pdev, di);
3172
3173         ret = ab8500_fg_sysfs_init(di);
3174         if (ret) {
3175                 dev_err(dev, "failed to create sysfs entry\n");
3176                 return ret;
3177         }
3178
3179         ret = ab8500_fg_sysfs_psy_create_attrs(di);
3180         if (ret) {
3181                 dev_err(dev, "failed to create FG psy\n");
3182                 ab8500_fg_sysfs_exit(di);
3183                 return ret;
3184         }
3185
3186         /* Calibrate the fg first time */
3187         di->flags.calibrate = true;
3188         di->calib_state = AB8500_FG_CALIB_INIT;
3189
3190         /* Use room temp as default value until we get an update from driver. */
3191         di->bat_temp = 210;
3192
3193         list_add_tail(&di->node, &ab8500_fg_list);
3194
3195         return component_add(dev, &ab8500_fg_component_ops);
3196 }
3197
3198 static int ab8500_fg_remove(struct platform_device *pdev)
3199 {
3200         int ret = 0;
3201         struct ab8500_fg *di = platform_get_drvdata(pdev);
3202
3203         component_del(&pdev->dev, &ab8500_fg_component_ops);
3204         list_del(&di->node);
3205         ab8500_fg_sysfs_exit(di);
3206         ab8500_fg_sysfs_psy_remove_attrs(di);
3207
3208         return ret;
3209 }
3210
3211 static SIMPLE_DEV_PM_OPS(ab8500_fg_pm_ops, ab8500_fg_suspend, ab8500_fg_resume);
3212
3213 static const struct of_device_id ab8500_fg_match[] = {
3214         { .compatible = "stericsson,ab8500-fg", },
3215         { },
3216 };
3217 MODULE_DEVICE_TABLE(of, ab8500_fg_match);
3218
3219 struct platform_driver ab8500_fg_driver = {
3220         .probe = ab8500_fg_probe,
3221         .remove = ab8500_fg_remove,
3222         .driver = {
3223                 .name = "ab8500-fg",
3224                 .of_match_table = ab8500_fg_match,
3225                 .pm = &ab8500_fg_pm_ops,
3226         },
3227 };
3228 MODULE_LICENSE("GPL v2");
3229 MODULE_AUTHOR("Johan Palsson, Karl Komierowski");
3230 MODULE_ALIAS("platform:ab8500-fg");
3231 MODULE_DESCRIPTION("AB8500 Fuel Gauge driver");