drivers/power/ab8500_fg.c

   1 /*
   2  * Copyright (C) ST-Ericsson AB 2012
   3  *
   4  * Main and Back-up battery management driver.
   5  *
   6  * Note: Backup battery management is required in case of Li-Ion battery and not
   7  * for capacitive battery. HREF boards have capacitive battery and hence backup
   8  * battery management is not used and the supported code is available in this
   9  * driver.
  10  *
  11  * License Terms: GNU General Public License v2
  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/device.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/power_supply.h>
  24 #include <linux/kobject.h>
  25 #include <linux/mfd/abx500/ab8500.h>
  26 #include <linux/mfd/abx500.h>
  27 #include <linux/slab.h>
  28 #include <linux/mfd/abx500/ab8500-bm.h>
  29 #include <linux/delay.h>
  30 #include <linux/mfd/abx500/ab8500-gpadc.h>
  31 #include <linux/mfd/abx500.h>
  32 #include <linux/time.h>
  33 #include <linux/completion.h>
  34
  35 #define MILLI_TO_MICRO                  1000
  36 #define FG_LSB_IN_MA                    1627
  37 #define QLSB_NANO_AMP_HOURS_X10         1129
  38 #define INS_CURR_TIMEOUT                (3 * HZ)
  39
  40 #define SEC_TO_SAMPLE(S)                (S * 4)
  41
  42 #define NBR_AVG_SAMPLES                 20
  43
  44 #define LOW_BAT_CHECK_INTERVAL          (2 * HZ)
  45
  46 #define VALID_CAPACITY_SEC              (45 * 60) /* 45 minutes */
  47 #define BATT_OK_MIN                     2360 /* mV */
  48 #define BATT_OK_INCREMENT               50 /* mV */
  49 #define BATT_OK_MAX_NR_INCREMENTS       0xE
  50
  51 /* FG constants */
  52 #define BATT_OVV                        0x01
  53
  54 #define interpolate(x, x1, y1, x2, y2) \
  55         ((y1) + ((((y2) - (y1)) * ((x) - (x1))) / ((x2) - (x1))));
  56
  57 #define to_ab8500_fg_device_info(x) container_of((x), \
  58         struct ab8500_fg, fg_psy);
  59
  60 /**
  61  * struct ab8500_fg_interrupts - ab8500 fg interupts
  62  * @name:       name of the interrupt
  63  * @isr         function pointer to the isr
  64  */
  65 struct ab8500_fg_interrupts {
  66         char *name;
  67         irqreturn_t (*isr)(int irq, void *data);
  68 };
  69
  70 enum ab8500_fg_discharge_state {
  71         AB8500_FG_DISCHARGE_INIT,
  72         AB8500_FG_DISCHARGE_INITMEASURING,
  73         AB8500_FG_DISCHARGE_INIT_RECOVERY,
  74         AB8500_FG_DISCHARGE_RECOVERY,
  75         AB8500_FG_DISCHARGE_READOUT_INIT,
  76         AB8500_FG_DISCHARGE_READOUT,
  77         AB8500_FG_DISCHARGE_WAKEUP,
  78 };
  79
  80 static char *discharge_state[] = {
  81         "DISCHARGE_INIT",
  82         "DISCHARGE_INITMEASURING",
  83         "DISCHARGE_INIT_RECOVERY",
  84         "DISCHARGE_RECOVERY",
  85         "DISCHARGE_READOUT_INIT",
  86         "DISCHARGE_READOUT",
  87         "DISCHARGE_WAKEUP",
  88 };
  89
  90 enum ab8500_fg_charge_state {
  91         AB8500_FG_CHARGE_INIT,
  92         AB8500_FG_CHARGE_READOUT,
  93 };
  94
  95 static char *charge_state[] = {
  96         "CHARGE_INIT",
  97         "CHARGE_READOUT",
  98 };
  99
 100 enum ab8500_fg_calibration_state {
 101         AB8500_FG_CALIB_INIT,
 102         AB8500_FG_CALIB_WAIT,
 103         AB8500_FG_CALIB_END,
 104 };
 105
 106 struct ab8500_fg_avg_cap {
 107         int avg;
 108         int samples[NBR_AVG_SAMPLES];
 109         __kernel_time_t time_stamps[NBR_AVG_SAMPLES];
 110         int pos;
 111         int nbr_samples;
 112         int sum;
 113 };
 114
 115 struct ab8500_fg_battery_capacity {
 116         int max_mah_design;
 117         int max_mah;
 118         int mah;
 119         int permille;
 120         int level;
 121         int prev_mah;
 122         int prev_percent;
 123         int prev_level;
 124         int user_mah;
 125 };
 126
 127 struct ab8500_fg_flags {
 128         bool fg_enabled;
 129         bool conv_done;
 130         bool charging;
 131         bool fully_charged;
 132         bool force_full;
 133         bool low_bat_delay;
 134         bool low_bat;
 135         bool bat_ovv;
 136         bool batt_unknown;
 137         bool calibrate;
 138         bool user_cap;
 139         bool batt_id_received;
 140 };
 141
 142 struct inst_curr_result_list {
 143         struct list_head list;
 144         int *result;
 145 };
 146
 147 /**
 148  * struct ab8500_fg - ab8500 FG device information
 149  * @dev:                Pointer to the structure device
 150  * @node:               a list of AB8500 FGs, hence prepared for reentrance
 151  * @irq                 holds the CCEOC interrupt number
 152  * @vbat:               Battery voltage in mV
 153  * @vbat_nom:           Nominal battery voltage in mV
 154  * @inst_curr:          Instantenous battery current in mA
 155  * @avg_curr:           Average battery current in mA
 156  * @bat_temp            battery temperature
 157  * @fg_samples:         Number of samples used in the FG accumulation
 158  * @accu_charge:        Accumulated charge from the last conversion
 159  * @recovery_cnt:       Counter for recovery mode
 160  * @high_curr_cnt:      Counter for high current mode
 161  * @init_cnt:           Counter for init mode
 162  * @recovery_needed:    Indicate if recovery is needed
 163  * @high_curr_mode:     Indicate if we're in high current mode
 164  * @init_capacity:      Indicate if initial capacity measuring should be done
 165  * @turn_off_fg:        True if fg was off before current measurement
 166  * @calib_state         State during offset calibration
 167  * @discharge_state:    Current discharge state
 168  * @charge_state:       Current charge state
 169  * @ab8500_fg_complete  Completion struct used for the instant current reading
 170  * @flags:              Structure for information about events triggered
 171  * @bat_cap:            Structure for battery capacity specific parameters
 172  * @avg_cap:            Average capacity filter
 173  * @parent:             Pointer to the struct ab8500
 174  * @gpadc:              Pointer to the struct gpadc
 175  * @pdata:              Pointer to the abx500_fg platform data
 176  * @bat:                Pointer to the abx500_bm platform data
 177  * @fg_psy:             Structure that holds the FG specific battery properties
 178  * @fg_wq:              Work queue for running the FG algorithm
 179  * @fg_periodic_work:   Work to run the FG algorithm periodically
 180  * @fg_low_bat_work:    Work to check low bat condition
 181  * @fg_reinit_work      Work used to reset and reinitialise the FG algorithm
 182  * @fg_work:            Work to run the FG algorithm instantly
 183  * @fg_acc_cur_work:    Work to read the FG accumulator
 184  * @fg_check_hw_failure_work:   Work for checking HW state
 185  * @cc_lock:            Mutex for locking the CC
 186  * @fg_kobject:         Structure of type kobject
 187  */
 188 struct ab8500_fg {
 189         struct device *dev;
 190         struct list_head node;
 191         int irq;
 192         int vbat;
 193         int vbat_nom;
 194         int inst_curr;
 195         int avg_curr;
 196         int bat_temp;
 197         int fg_samples;
 198         int accu_charge;
 199         int recovery_cnt;
 200         int high_curr_cnt;
 201         int init_cnt;
 202         bool recovery_needed;
 203         bool high_curr_mode;
 204         bool init_capacity;
 205         bool turn_off_fg;
 206         enum ab8500_fg_calibration_state calib_state;
 207         enum ab8500_fg_discharge_state discharge_state;
 208         enum ab8500_fg_charge_state charge_state;
 209         struct completion ab8500_fg_complete;
 210         struct ab8500_fg_flags flags;
 211         struct ab8500_fg_battery_capacity bat_cap;
 212         struct ab8500_fg_avg_cap avg_cap;
 213         struct ab8500 *parent;
 214         struct ab8500_gpadc *gpadc;
 215         struct abx500_fg_platform_data *pdata;
 216         struct abx500_bm_data *bat;
 217         struct power_supply fg_psy;
 218         struct workqueue_struct *fg_wq;
 219         struct delayed_work fg_periodic_work;
 220         struct delayed_work fg_low_bat_work;
 221         struct delayed_work fg_reinit_work;
 222         struct work_struct fg_work;
 223         struct work_struct fg_acc_cur_work;
 224         struct delayed_work fg_check_hw_failure_work;
 225         struct mutex cc_lock;
 226         struct kobject fg_kobject;
 227 };
 228 static LIST_HEAD(ab8500_fg_list);
 229
 230 /**
 231  * ab8500_fg_get() - returns a reference to the primary AB8500 fuel gauge
 232  * (i.e. the first fuel gauge in the instance list)
 233  */
 234 struct ab8500_fg *ab8500_fg_get(void)
 235 {
 236         struct ab8500_fg *fg;
 237
 238         if (list_empty(&ab8500_fg_list))
 239                 return NULL;
 240
 241         fg = list_first_entry(&ab8500_fg_list, struct ab8500_fg, node);
 242         return fg;
 243 }
 244
 245 /* Main battery properties */
 246 static enum power_supply_property ab8500_fg_props[] = {
 247         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 248         POWER_SUPPLY_PROP_CURRENT_NOW,
 249         POWER_SUPPLY_PROP_CURRENT_AVG,
 250         POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
 251         POWER_SUPPLY_PROP_ENERGY_FULL,
 252         POWER_SUPPLY_PROP_ENERGY_NOW,
 253         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 254         POWER_SUPPLY_PROP_CHARGE_FULL,
 255         POWER_SUPPLY_PROP_CHARGE_NOW,
 256         POWER_SUPPLY_PROP_CAPACITY,
 257         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 258 };
 259
 260 /*
 261  * This array maps the raw hex value to lowbat voltage used by the AB8500
 262  * Values taken from the UM0836
 263  */
 264 static int ab8500_fg_lowbat_voltage_map[] = {
 265         2300 ,
 266         2325 ,
 267         2350 ,
 268         2375 ,
 269         2400 ,
 270         2425 ,
 271         2450 ,
 272         2475 ,
 273         2500 ,
 274         2525 ,
 275         2550 ,
 276         2575 ,
 277         2600 ,
 278         2625 ,
 279         2650 ,
 280         2675 ,
 281         2700 ,
 282         2725 ,
 283         2750 ,
 284         2775 ,
 285         2800 ,
 286         2825 ,
 287         2850 ,
 288         2875 ,
 289         2900 ,
 290         2925 ,
 291         2950 ,
 292         2975 ,
 293         3000 ,
 294         3025 ,
 295         3050 ,
 296         3075 ,
 297         3100 ,
 298         3125 ,
 299         3150 ,
 300         3175 ,
 301         3200 ,
 302         3225 ,
 303         3250 ,
 304         3275 ,
 305         3300 ,
 306         3325 ,
 307         3350 ,
 308         3375 ,
 309         3400 ,
 310         3425 ,
 311         3450 ,
 312         3475 ,
 313         3500 ,
 314         3525 ,
 315         3550 ,
 316         3575 ,
 317         3600 ,
 318         3625 ,
 319         3650 ,
 320         3675 ,
 321         3700 ,
 322         3725 ,
 323         3750 ,
 324         3775 ,
 325         3800 ,
 326         3825 ,
 327         3850 ,
 328         3850 ,
 329 };
 330
 331 static u8 ab8500_volt_to_regval(int voltage)
 332 {
 333         int i;
 334
 335         if (voltage < ab8500_fg_lowbat_voltage_map[0])
 336                 return 0;
 337
 338         for (i = 0; i < ARRAY_SIZE(ab8500_fg_lowbat_voltage_map); i++) {
 339                 if (voltage < ab8500_fg_lowbat_voltage_map[i])
 340                         return (u8) i - 1;
 341         }
 342
 343         /* If not captured above, return index of last element */
 344         return (u8) ARRAY_SIZE(ab8500_fg_lowbat_voltage_map) - 1;
 345 }
 346
 347 /**
 348  * ab8500_fg_is_low_curr() - Low or high current mode
 349  * @di:         pointer to the ab8500_fg structure
 350  * @curr:       the current to base or our decision on
 351  *
 352  * Low current mode if the current consumption is below a certain threshold
 353  */
 354 static int ab8500_fg_is_low_curr(struct ab8500_fg *di, int curr)
 355 {
 356         /*
 357          * We want to know if we're in low current mode
 358          */
 359         if (curr > -di->bat->fg_params->high_curr_threshold)
 360                 return true;
 361         else
 362                 return false;
 363 }
 364
 365 /**
 366  * ab8500_fg_add_cap_sample() - Add capacity to average filter
 367  * @di:         pointer to the ab8500_fg structure
 368  * @sample:     the capacity in mAh to add to the filter
 369  *
 370  * A capacity is added to the filter and a new mean capacity is calculated and
 371  * returned
 372  */
 373 static int ab8500_fg_add_cap_sample(struct ab8500_fg *di, int sample)
 374 {
 375         struct timespec ts;
 376         struct ab8500_fg_avg_cap *avg = &di->avg_cap;
 377
 378         getnstimeofday(&ts);
 379
 380         do {
 381                 avg->sum += sample - avg->samples[avg->pos];
 382                 avg->samples[avg->pos] = sample;
 383                 avg->time_stamps[avg->pos] = ts.tv_sec;
 384                 avg->pos++;
 385
 386                 if (avg->pos == NBR_AVG_SAMPLES)
 387                         avg->pos = 0;
 388
 389                 if (avg->nbr_samples < NBR_AVG_SAMPLES)
 390                         avg->nbr_samples++;
 391
 392                 /*
 393                  * Check the time stamp for each sample. If too old,
 394                  * replace with latest sample
 395                  */
 396         } while (ts.tv_sec - VALID_CAPACITY_SEC > avg->time_stamps[avg->pos]);
 397
 398         avg->avg = avg->sum / avg->nbr_samples;
 399
 400         return avg->avg;
 401 }
 402
 403 /**
 404  * ab8500_fg_clear_cap_samples() - Clear average filter
 405  * @di:         pointer to the ab8500_fg structure
 406  *
 407  * The capacity filter is is reset to zero.
 408  */
 409 static void ab8500_fg_clear_cap_samples(struct ab8500_fg *di)
 410 {
 411         int i;
 412         struct ab8500_fg_avg_cap *avg = &di->avg_cap;
 413
 414         avg->pos = 0;
 415         avg->nbr_samples = 0;
 416         avg->sum = 0;
 417         avg->avg = 0;
 418
 419         for (i = 0; i < NBR_AVG_SAMPLES; i++) {
 420                 avg->samples[i] = 0;
 421                 avg->time_stamps[i] = 0;
 422         }
 423 }
 424
 425 /**
 426  * ab8500_fg_fill_cap_sample() - Fill average filter
 427  * @di:         pointer to the ab8500_fg structure
 428  * @sample:     the capacity in mAh to fill the filter with
 429  *
 430  * The capacity filter is filled with a capacity in mAh
 431  */
 432 static void ab8500_fg_fill_cap_sample(struct ab8500_fg *di, int sample)
 433 {
 434         int i;
 435         struct timespec ts;
 436         struct ab8500_fg_avg_cap *avg = &di->avg_cap;
 437
 438         getnstimeofday(&ts);
 439
 440         for (i = 0; i < NBR_AVG_SAMPLES; i++) {
 441                 avg->samples[i] = sample;
 442                 avg->time_stamps[i] = ts.tv_sec;
 443         }
 444
 445         avg->pos = 0;
 446         avg->nbr_samples = NBR_AVG_SAMPLES;
 447         avg->sum = sample * NBR_AVG_SAMPLES;
 448         avg->avg = sample;
 449 }
 450
 451 /**
 452  * ab8500_fg_coulomb_counter() - enable coulomb counter
 453  * @di:         pointer to the ab8500_fg structure
 454  * @enable:     enable/disable
 455  *
 456  * Enable/Disable coulomb counter.
 457  * On failure returns negative value.
 458  */
 459 static int ab8500_fg_coulomb_counter(struct ab8500_fg *di, bool enable)
 460 {
 461         int ret = 0;
 462         mutex_lock(&di->cc_lock);
 463         if (enable) {
 464                 /* To be able to reprogram the number of samples, we have to
 465                  * first stop the CC and then enable it again */
 466                 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
 467                         AB8500_RTC_CC_CONF_REG, 0x00);
 468                 if (ret)
 469                         goto cc_err;
 470
 471                 /* Program the samples */
 472                 ret = abx500_set_register_interruptible(di->dev,
 473                         AB8500_GAS_GAUGE, AB8500_GASG_CC_NCOV_ACCU,
 474                         di->fg_samples);
 475                 if (ret)
 476                         goto cc_err;
 477
 478                 /* Start the CC */
 479                 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
 480                         AB8500_RTC_CC_CONF_REG,
 481                         (CC_DEEP_SLEEP_ENA | CC_PWR_UP_ENA));
 482                 if (ret)
 483                         goto cc_err;
 484
 485                 di->flags.fg_enabled = true;
 486         } else {
 487                 /* Clear any pending read requests */
 488                 ret = abx500_set_register_interruptible(di->dev,
 489                         AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG, 0);
 490                 if (ret)
 491                         goto cc_err;
 492
 493                 ret = abx500_set_register_interruptible(di->dev,
 494                         AB8500_GAS_GAUGE, AB8500_GASG_CC_NCOV_ACCU_CTRL, 0);
 495                 if (ret)
 496                         goto cc_err;
 497
 498                 /* Stop the CC */
 499                 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
 500                         AB8500_RTC_CC_CONF_REG, 0);
 501                 if (ret)
 502                         goto cc_err;
 503
 504                 di->flags.fg_enabled = false;
 505
 506         }
 507         dev_dbg(di->dev, " CC enabled: %d Samples: %d\n",
 508                 enable, di->fg_samples);
 509
 510         mutex_unlock(&di->cc_lock);
 511
 512         return ret;
 513 cc_err:
 514         dev_err(di->dev, "%s Enabling coulomb counter failed\n", __func__);
 515         mutex_unlock(&di->cc_lock);
 516         return ret;
 517 }
 518
 519 /**
 520  * ab8500_fg_inst_curr_start() - start battery instantaneous current
 521  * @di:         pointer to the ab8500_fg structure
 522  *
 523  * Returns 0 or error code
 524  * Note: This is part "one" and has to be called before
 525  * ab8500_fg_inst_curr_finalize()
 526  */
 527  int ab8500_fg_inst_curr_start(struct ab8500_fg *di)
 528 {
 529         u8 reg_val;
 530         int ret;
 531
 532         mutex_lock(&di->cc_lock);
 533
 534         ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
 535                 AB8500_RTC_CC_CONF_REG, &reg_val);
 536         if (ret < 0)
 537                 goto fail;
 538
 539         if (!(reg_val & CC_PWR_UP_ENA)) {
 540                 dev_dbg(di->dev, "%s Enable FG\n", __func__);
 541                 di->turn_off_fg = true;
 542
 543                 /* Program the samples */
 544                 ret = abx500_set_register_interruptible(di->dev,
 545                         AB8500_GAS_GAUGE, AB8500_GASG_CC_NCOV_ACCU,
 546                         SEC_TO_SAMPLE(10));
 547                 if (ret)
 548                         goto fail;
 549
 550                 /* Start the CC */
 551                 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
 552                         AB8500_RTC_CC_CONF_REG,
 553                         (CC_DEEP_SLEEP_ENA | CC_PWR_UP_ENA));
 554                 if (ret)
 555                         goto fail;
 556         } else {
 557                 di->turn_off_fg = false;
 558         }
 559
 560         /* Return and WFI */
 561         INIT_COMPLETION(di->ab8500_fg_complete);
 562         enable_irq(di->irq);
 563
 564         /* Note: cc_lock is still locked */
 565         return 0;
 566 fail:
 567         mutex_unlock(&di->cc_lock);
 568         return ret;
 569 }
 570
 571 /**
 572  * ab8500_fg_inst_curr_done() - check if fg conversion is done
 573  * @di:         pointer to the ab8500_fg structure
 574  *
 575  * Returns 1 if conversion done, 0 if still waiting
 576  */
 577 int ab8500_fg_inst_curr_done(struct ab8500_fg *di)
 578 {
 579         return completion_done(&di->ab8500_fg_complete);
 580 }
 581
 582 /**
 583  * ab8500_fg_inst_curr_finalize() - battery instantaneous current
 584  * @di:         pointer to the ab8500_fg structure
 585  * @res:        battery instantenous current(on success)
 586  *
 587  * Returns 0 or an error code
 588  * Note: This is part "two" and has to be called at earliest 250 ms
 589  * after ab8500_fg_inst_curr_start()
 590  */
 591 int ab8500_fg_inst_curr_finalize(struct ab8500_fg *di, int *res)
 592 {
 593         u8 low, high;
 594         int val;
 595         int ret;
 596         int timeout;
 597
 598         if (!completion_done(&di->ab8500_fg_complete)) {
 599                 timeout = wait_for_completion_timeout(&di->ab8500_fg_complete,
 600                         INS_CURR_TIMEOUT);
 601                 dev_dbg(di->dev, "Finalize time: %d ms\n",
 602                         ((INS_CURR_TIMEOUT - timeout) * 1000) / HZ);
 603                 if (!timeout) {
 604                         ret = -ETIME;
 605                         disable_irq(di->irq);
 606                         dev_err(di->dev, "completion timed out [%d]\n",
 607                                 __LINE__);
 608                         goto fail;
 609                 }
 610         }
 611
 612         disable_irq(di->irq);
 613
 614         ret = abx500_mask_and_set_register_interruptible(di->dev,
 615                         AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG,
 616                         READ_REQ, READ_REQ);
 617
 618         /* 100uS between read request and read is needed */
 619         usleep_range(100, 100);
 620
 621         /* Read CC Sample conversion value Low and high */
 622         ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE,
 623                 AB8500_GASG_CC_SMPL_CNVL_REG,  &low);
 624         if (ret < 0)
 625                 goto fail;
 626
 627         ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE,
 628                 AB8500_GASG_CC_SMPL_CNVH_REG,  &high);
 629         if (ret < 0)
 630                 goto fail;
 631
 632         /*
 633          * negative value for Discharging
 634          * convert 2's compliment into decimal
 635          */
 636         if (high & 0x10)
 637                 val = (low | (high << 8) | 0xFFFFE000);
 638         else
 639                 val = (low | (high << 8));
 640
 641         /*
 642          * Convert to unit value in mA
 643          * Full scale input voltage is
 644          * 66.660mV => LSB = 66.660mV/(4096*res) = 1.627mA
 645          * Given a 250ms conversion cycle time the LSB corresponds
 646          * to 112.9 nAh. Convert to current by dividing by the conversion
 647          * time in hours (250ms = 1 / (3600 * 4)h)
 648          * 112.9nAh assumes 10mOhm, but fg_res is in 0.1mOhm
 649          */
 650         val = (val * QLSB_NANO_AMP_HOURS_X10 * 36 * 4) /
 651                 (1000 * di->bat->fg_res);
 652
 653         if (di->turn_off_fg) {
 654                 dev_dbg(di->dev, "%s Disable FG\n", __func__);
 655
 656                 /* Clear any pending read requests */
 657                 ret = abx500_set_register_interruptible(di->dev,
 658                         AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG, 0);
 659                 if (ret)
 660                         goto fail;
 661
 662                 /* Stop the CC */
 663                 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
 664                         AB8500_RTC_CC_CONF_REG, 0);
 665                 if (ret)
 666                         goto fail;
 667         }
 668         mutex_unlock(&di->cc_lock);
 669         (*res) = val;
 670
 671         return 0;
 672 fail:
 673         mutex_unlock(&di->cc_lock);
 674         return ret;
 675 }
 676
 677 /**
 678  * ab8500_fg_inst_curr_blocking() - battery instantaneous current
 679  * @di:         pointer to the ab8500_fg structure
 680  * @res:        battery instantenous current(on success)
 681  *
 682  * Returns 0 else error code
 683  */
 684 int ab8500_fg_inst_curr_blocking(struct ab8500_fg *di)
 685 {
 686         int ret;
 687         int res = 0;
 688
 689         ret = ab8500_fg_inst_curr_start(di);
 690         if (ret) {
 691                 dev_err(di->dev, "Failed to initialize fg_inst\n");
 692                 return 0;
 693         }
 694
 695         ret = ab8500_fg_inst_curr_finalize(di, &res);
 696         if (ret) {
 697                 dev_err(di->dev, "Failed to finalize fg_inst\n");
 698                 return 0;
 699         }
 700
 701         return res;
 702 }
 703
 704 /**
 705  * ab8500_fg_acc_cur_work() - average battery current
 706  * @work:       pointer to the work_struct structure
 707  *
 708  * Updated the average battery current obtained from the
 709  * coulomb counter.
 710  */
 711 static void ab8500_fg_acc_cur_work(struct work_struct *work)
 712 {
 713         int val;
 714         int ret;
 715         u8 low, med, high;
 716
 717         struct ab8500_fg *di = container_of(work,
 718                 struct ab8500_fg, fg_acc_cur_work);
 719
 720         mutex_lock(&di->cc_lock);
 721         ret = abx500_set_register_interruptible(di->dev, AB8500_GAS_GAUGE,
 722                 AB8500_GASG_CC_NCOV_ACCU_CTRL, RD_NCONV_ACCU_REQ);
 723         if (ret)
 724                 goto exit;
 725
 726         ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE,
 727                 AB8500_GASG_CC_NCOV_ACCU_LOW,  &low);
 728         if (ret < 0)
 729                 goto exit;
 730
 731         ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE,
 732                 AB8500_GASG_CC_NCOV_ACCU_MED,  &med);
 733         if (ret < 0)
 734                 goto exit;
 735
 736         ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE,
 737                 AB8500_GASG_CC_NCOV_ACCU_HIGH, &high);
 738         if (ret < 0)
 739                 goto exit;
 740
 741         /* Check for sign bit in case of negative value, 2's compliment */
 742         if (high & 0x10)
 743                 val = (low | (med << 8) | (high << 16) | 0xFFE00000);
 744         else
 745                 val = (low | (med << 8) | (high << 16));
 746
 747         /*
 748          * Convert to uAh
 749          * Given a 250ms conversion cycle time the LSB corresponds
 750          * to 112.9 nAh.
 751          * 112.9nAh assumes 10mOhm, but fg_res is in 0.1mOhm
 752          */
 753         di->accu_charge = (val * QLSB_NANO_AMP_HOURS_X10) /
 754                 (100 * di->bat->fg_res);
 755
 756         /*
 757          * Convert to unit value in mA
 758          * Full scale input voltage is
 759          * 66.660mV => LSB = 66.660mV/(4096*res) = 1.627mA
 760          * Given a 250ms conversion cycle time the LSB corresponds
 761          * to 112.9 nAh. Convert to current by dividing by the conversion
 762          * time in hours (= samples / (3600 * 4)h)
 763          * 112.9nAh assumes 10mOhm, but fg_res is in 0.1mOhm
 764          */
 765         di->avg_curr = (val * QLSB_NANO_AMP_HOURS_X10 * 36) /
 766                 (1000 * di->bat->fg_res * (di->fg_samples / 4));
 767
 768         di->flags.conv_done = true;
 769
 770         mutex_unlock(&di->cc_lock);
 771
 772         queue_work(di->fg_wq, &di->fg_work);
 773
 774         return;
 775 exit:
 776         dev_err(di->dev,
 777                 "Failed to read or write gas gauge registers\n");
 778         mutex_unlock(&di->cc_lock);
 779         queue_work(di->fg_wq, &di->fg_work);
 780 }
 781
 782 /**
 783  * ab8500_fg_bat_voltage() - get battery voltage
 784  * @di:         pointer to the ab8500_fg structure
 785  *
 786  * Returns battery voltage(on success) else error code
 787  */
 788 static int ab8500_fg_bat_voltage(struct ab8500_fg *di)
 789 {
 790         int vbat;
 791         static int prev;
 792
 793         vbat = ab8500_gpadc_convert(di->gpadc, MAIN_BAT_V);
 794         if (vbat < 0) {
 795                 dev_err(di->dev,
 796                         "%s gpadc conversion failed, using previous value\n",
 797                         __func__);
 798                 return prev;
 799         }
 800
 801         prev = vbat;
 802         return vbat;
 803 }
 804
 805 /**
 806  * ab8500_fg_volt_to_capacity() - Voltage based capacity
 807  * @di:         pointer to the ab8500_fg structure
 808  * @voltage:    The voltage to convert to a capacity
 809  *
 810  * Returns battery capacity in per mille based on voltage
 811  */
 812 static int ab8500_fg_volt_to_capacity(struct ab8500_fg *di, int voltage)
 813 {
 814         int i, tbl_size;
 815         struct abx500_v_to_cap *tbl;
 816         int cap = 0;
 817
 818         tbl = di->bat->bat_type[di->bat->batt_id].v_to_cap_tbl,
 819         tbl_size = di->bat->bat_type[di->bat->batt_id].n_v_cap_tbl_elements;
 820
 821         for (i = 0; i < tbl_size; ++i) {
 822                 if (voltage > tbl[i].voltage)
 823                         break;
 824         }
 825
 826         if ((i > 0) && (i < tbl_size)) {
 827                 cap = interpolate(voltage,
 828                         tbl[i].voltage,
 829                         tbl[i].capacity * 10,
 830                         tbl[i-1].voltage,
 831                         tbl[i-1].capacity * 10);
 832         } else if (i == 0) {
 833                 cap = 1000;
 834         } else {
 835                 cap = 0;
 836         }
 837
 838         dev_dbg(di->dev, "%s Vbat: %d, Cap: %d per mille",
 839                 __func__, voltage, cap);
 840
 841         return cap;
 842 }
 843
 844 /**
 845  * ab8500_fg_uncomp_volt_to_capacity() - Uncompensated voltage based capacity
 846  * @di:         pointer to the ab8500_fg structure
 847  *
 848  * Returns battery capacity based on battery voltage that is not compensated
 849  * for the voltage drop due to the load
 850  */
 851 static int ab8500_fg_uncomp_volt_to_capacity(struct ab8500_fg *di)
 852 {
 853         di->vbat = ab8500_fg_bat_voltage(di);
 854         return ab8500_fg_volt_to_capacity(di, di->vbat);
 855 }
 856
 857 /**
 858  * ab8500_fg_battery_resistance() - Returns the battery inner resistance
 859  * @di:         pointer to the ab8500_fg structure
 860  *
 861  * Returns battery inner resistance added with the fuel gauge resistor value
 862  * to get the total resistance in the whole link from gnd to bat+ node.
 863  */
 864 static int ab8500_fg_battery_resistance(struct ab8500_fg *di)
 865 {
 866         int i, tbl_size;
 867         struct batres_vs_temp *tbl;
 868         int resist = 0;
 869
 870         tbl = di->bat->bat_type[di->bat->batt_id].batres_tbl;
 871         tbl_size = di->bat->bat_type[di->bat->batt_id].n_batres_tbl_elements;
 872
 873         for (i = 0; i < tbl_size; ++i) {
 874                 if (di->bat_temp / 10 > tbl[i].temp)
 875                         break;
 876         }
 877
 878         if ((i > 0) && (i < tbl_size)) {
 879                 resist = interpolate(di->bat_temp / 10,
 880                         tbl[i].temp,
 881                         tbl[i].resist,
 882                         tbl[i-1].temp,
 883                         tbl[i-1].resist);
 884         } else if (i == 0) {
 885                 resist = tbl[0].resist;
 886         } else {
 887                 resist = tbl[tbl_size - 1].resist;
 888         }
 889
 890         dev_dbg(di->dev, "%s Temp: %d battery internal resistance: %d"
 891             " fg resistance %d, total: %d (mOhm)\n",
 892                 __func__, di->bat_temp, resist, di->bat->fg_res / 10,
 893                 (di->bat->fg_res / 10) + resist);
 894
 895         /* fg_res variable is in 0.1mOhm */
 896         resist += di->bat->fg_res / 10;
 897
 898         return resist;
 899 }
 900
 901 /**
 902  * ab8500_fg_load_comp_volt_to_capacity() - Load compensated voltage based capacity
 903  * @di:         pointer to the ab8500_fg structure
 904  *
 905  * Returns battery capacity based on battery voltage that is load compensated
 906  * for the voltage drop
 907  */
 908 static int ab8500_fg_load_comp_volt_to_capacity(struct ab8500_fg *di)
 909 {
 910         int vbat_comp, res;
 911         int i = 0;
 912         int vbat = 0;
 913
 914         ab8500_fg_inst_curr_start(di);
 915
 916         do {
 917                 vbat += ab8500_fg_bat_voltage(di);
 918                 i++;
 919                 msleep(5);
 920         } while (!ab8500_fg_inst_curr_done(di));
 921
 922         ab8500_fg_inst_curr_finalize(di, &di->inst_curr);
 923
 924         di->vbat = vbat / i;
 925         res = ab8500_fg_battery_resistance(di);
 926
 927         /* Use Ohms law to get the load compensated voltage */
 928         vbat_comp = di->vbat - (di->inst_curr * res) / 1000;
 929
 930         dev_dbg(di->dev, "%s Measured Vbat: %dmV,Compensated Vbat %dmV, "
 931                 "R: %dmOhm, Current: %dmA Vbat Samples: %d\n",
 932                 __func__, di->vbat, vbat_comp, res, di->inst_curr, i);
 933
 934         return ab8500_fg_volt_to_capacity(di, vbat_comp);
 935 }
 936
 937 /**
 938  * ab8500_fg_convert_mah_to_permille() - Capacity in mAh to permille
 939  * @di:         pointer to the ab8500_fg structure
 940  * @cap_mah:    capacity in mAh
 941  *
 942  * Converts capacity in mAh to capacity in permille
 943  */
 944 static int ab8500_fg_convert_mah_to_permille(struct ab8500_fg *di, int cap_mah)
 945 {
 946         return (cap_mah * 1000) / di->bat_cap.max_mah_design;
 947 }
 948
 949 /**
 950  * ab8500_fg_convert_permille_to_mah() - Capacity in permille to mAh
 951  * @di:         pointer to the ab8500_fg structure
 952  * @cap_pm:     capacity in permille
 953  *
 954  * Converts capacity in permille to capacity in mAh
 955  */
 956 static int ab8500_fg_convert_permille_to_mah(struct ab8500_fg *di, int cap_pm)
 957 {
 958         return cap_pm * di->bat_cap.max_mah_design / 1000;
 959 }
 960
 961 /**
 962  * ab8500_fg_convert_mah_to_uwh() - Capacity in mAh to uWh
 963  * @di:         pointer to the ab8500_fg structure
 964  * @cap_mah:    capacity in mAh
 965  *
 966  * Converts capacity in mAh to capacity in uWh
 967  */
 968 static int ab8500_fg_convert_mah_to_uwh(struct ab8500_fg *di, int cap_mah)
 969 {
 970         u64 div_res;
 971         u32 div_rem;
 972
 973         div_res = ((u64) cap_mah) * ((u64) di->vbat_nom);
 974         div_rem = do_div(div_res, 1000);
 975
 976         /* Make sure to round upwards if necessary */
 977         if (div_rem >= 1000 / 2)
 978                 div_res++;
 979
 980         return (int) div_res;
 981 }
 982
 983 /**
 984  * ab8500_fg_calc_cap_charging() - Calculate remaining capacity while charging
 985  * @di:         pointer to the ab8500_fg structure
 986  *
 987  * Return the capacity in mAh based on previous calculated capcity and the FG
 988  * accumulator register value. The filter is filled with this capacity
 989  */
 990 static int ab8500_fg_calc_cap_charging(struct ab8500_fg *di)
 991 {
 992         dev_dbg(di->dev, "%s cap_mah %d accu_charge %d\n",
 993                 __func__,
 994                 di->bat_cap.mah,
 995                 di->accu_charge);
 996
 997         /* Capacity should not be less than 0 */
 998         if (di->bat_cap.mah + di->accu_charge > 0)
 999                 di->bat_cap.mah += di->accu_charge;
1000         else
1001                 di->bat_cap.mah = 0;
1002         /*
1003          * We force capacity to 100% once when the algorithm
1004          * reports that it's full.
1005          */
1006         if (di->bat_cap.mah >= di->bat_cap.max_mah_design ||
1007                 di->flags.force_full) {
1008                 di->bat_cap.mah = di->bat_cap.max_mah_design;
1009         }
1010
1011         ab8500_fg_fill_cap_sample(di, di->bat_cap.mah);
1012         di->bat_cap.permille =
1013                 ab8500_fg_convert_mah_to_permille(di, di->bat_cap.mah);
1014
1015         /* We need to update battery voltage and inst current when charging */
1016         di->vbat = ab8500_fg_bat_voltage(di);
1017         di->inst_curr = ab8500_fg_inst_curr_blocking(di);
1018
1019         return di->bat_cap.mah;
1020 }
1021
1022 /**
1023  * ab8500_fg_calc_cap_discharge_voltage() - Capacity in discharge with voltage
1024  * @di:         pointer to the ab8500_fg structure
1025  * @comp:       if voltage should be load compensated before capacity calc
1026  *
1027  * Return the capacity in mAh based on the battery voltage. The voltage can
1028  * either be load compensated or not. This value is added to the filter and a
1029  * new mean value is calculated and returned.
1030  */
1031 static int ab8500_fg_calc_cap_discharge_voltage(struct ab8500_fg *di, bool comp)
1032 {
1033         int permille, mah;
1034
1035         if (comp)
1036                 permille = ab8500_fg_load_comp_volt_to_capacity(di);
1037         else
1038                 permille = ab8500_fg_uncomp_volt_to_capacity(di);
1039
1040         mah = ab8500_fg_convert_permille_to_mah(di, permille);
1041
1042         di->bat_cap.mah = ab8500_fg_add_cap_sample(di, mah);
1043         di->bat_cap.permille =
1044                 ab8500_fg_convert_mah_to_permille(di, di->bat_cap.mah);
1045
1046         return di->bat_cap.mah;
1047 }
1048
1049 /**
1050  * ab8500_fg_calc_cap_discharge_fg() - Capacity in discharge with FG
1051  * @di:         pointer to the ab8500_fg structure
1052  *
1053  * Return the capacity in mAh based on previous calculated capcity and the FG
1054  * accumulator register value. This value is added to the filter and a
1055  * new mean value is calculated and returned.
1056  */
1057 static int ab8500_fg_calc_cap_discharge_fg(struct ab8500_fg *di)
1058 {
1059         int permille_volt, permille;
1060
1061         dev_dbg(di->dev, "%s cap_mah %d accu_charge %d\n",
1062                 __func__,
1063                 di->bat_cap.mah,
1064                 di->accu_charge);
1065
1066         /* Capacity should not be less than 0 */
1067         if (di->bat_cap.mah + di->accu_charge > 0)
1068                 di->bat_cap.mah += di->accu_charge;
1069         else
1070                 di->bat_cap.mah = 0;
1071
1072         if (di->bat_cap.mah >= di->bat_cap.max_mah_design)
1073                 di->bat_cap.mah = di->bat_cap.max_mah_design;
1074
1075         /*
1076          * Check against voltage based capacity. It can not be lower
1077          * than what the uncompensated voltage says
1078          */
1079         permille = ab8500_fg_convert_mah_to_permille(di, di->bat_cap.mah);
1080         permille_volt = ab8500_fg_uncomp_volt_to_capacity(di);
1081
1082         if (permille < permille_volt) {
1083                 di->bat_cap.permille = permille_volt;
1084                 di->bat_cap.mah = ab8500_fg_convert_permille_to_mah(di,
1085                         di->bat_cap.permille);
1086
1087                 dev_dbg(di->dev, "%s voltage based: perm %d perm_volt %d\n",
1088                         __func__,
1089                         permille,
1090                         permille_volt);
1091
1092                 ab8500_fg_fill_cap_sample(di, di->bat_cap.mah);
1093         } else {
1094                 ab8500_fg_fill_cap_sample(di, di->bat_cap.mah);
1095                 di->bat_cap.permille =
1096                         ab8500_fg_convert_mah_to_permille(di, di->bat_cap.mah);
1097         }
1098
1099         return di->bat_cap.mah;
1100 }
1101
1102 /**
1103  * ab8500_fg_capacity_level() - Get the battery capacity level
1104  * @di:         pointer to the ab8500_fg structure
1105  *
1106  * Get the battery capacity level based on the capacity in percent
1107  */
1108 static int ab8500_fg_capacity_level(struct ab8500_fg *di)
1109 {
1110         int ret, percent;
1111
1112         percent = di->bat_cap.permille / 10;
1113
1114         if (percent <= di->bat->cap_levels->critical ||
1115                 di->flags.low_bat)
1116                 ret = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
1117         else if (percent <= di->bat->cap_levels->low)
1118                 ret = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
1119         else if (percent <= di->bat->cap_levels->normal)
1120                 ret = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
1121         else if (percent <= di->bat->cap_levels->high)
1122                 ret = POWER_SUPPLY_CAPACITY_LEVEL_HIGH;
1123         else
1124                 ret = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
1125
1126         return ret;
1127 }
1128
1129 /**
1130  * ab8500_fg_check_capacity_limits() - Check if capacity has changed
1131  * @di:         pointer to the ab8500_fg structure
1132  * @init:       capacity is allowed to go up in init mode
1133  *
1134  * Check if capacity or capacity limit has changed and notify the system
1135  * about it using the power_supply framework
1136  */
1137 static void ab8500_fg_check_capacity_limits(struct ab8500_fg *di, bool init)
1138 {
1139         bool changed = false;
1140
1141         di->bat_cap.level = ab8500_fg_capacity_level(di);
1142
1143         if (di->bat_cap.level != di->bat_cap.prev_level) {
1144                 /*
1145                  * We do not allow reported capacity level to go up
1146                  * unless we're charging or if we're in init
1147                  */
1148                 if (!(!di->flags.charging && di->bat_cap.level >
1149                         di->bat_cap.prev_level) || init) {
1150                         dev_dbg(di->dev, "level changed from %d to %d\n",
1151                                 di->bat_cap.prev_level,
1152                                 di->bat_cap.level);
1153                         di->bat_cap.prev_level = di->bat_cap.level;
1154                         changed = true;
1155                 } else {
1156                         dev_dbg(di->dev, "level not allowed to go up "
1157                                 "since no charger is connected: %d to %d\n",
1158                                 di->bat_cap.prev_level,
1159                                 di->bat_cap.level);
1160                 }
1161         }
1162
1163         /*
1164          * If we have received the LOW_BAT IRQ, set capacity to 0 to initiate
1165          * shutdown
1166          */
1167         if (di->flags.low_bat) {
1168                 dev_dbg(di->dev, "Battery low, set capacity to 0\n");
1169                 di->bat_cap.prev_percent = 0;
1170                 di->bat_cap.permille = 0;
1171                 di->bat_cap.prev_mah = 0;
1172                 di->bat_cap.mah = 0;
1173                 changed = true;
1174         } else if (di->flags.fully_charged) {
1175                 /*
1176                  * We report 100% if algorithm reported fully charged
1177                  * unless capacity drops too much
1178                  */
1179                 if (di->flags.force_full) {
1180                         di->bat_cap.prev_percent = di->bat_cap.permille / 10;
1181                         di->bat_cap.prev_mah = di->bat_cap.mah;
1182                 } else if (!di->flags.force_full &&
1183                         di->bat_cap.prev_percent !=
1184                         (di->bat_cap.permille) / 10 &&
1185                         (di->bat_cap.permille / 10) <
1186                         di->bat->fg_params->maint_thres) {
1187                         dev_dbg(di->dev,
1188                                 "battery reported full "
1189                                 "but capacity dropping: %d\n",
1190                                 di->bat_cap.permille / 10);
1191                         di->bat_cap.prev_percent = di->bat_cap.permille / 10;
1192                         di->bat_cap.prev_mah = di->bat_cap.mah;
1193
1194                         changed = true;
1195                 }
1196         } else if (di->bat_cap.prev_percent != di->bat_cap.permille / 10) {
1197                 if (di->bat_cap.permille / 10 == 0) {
1198                         /*
1199                          * We will not report 0% unless we've got
1200                          * the LOW_BAT IRQ, no matter what the FG
1201                          * algorithm says.
1202                          */
1203                         di->bat_cap.prev_percent = 1;
1204                         di->bat_cap.permille = 1;
1205                         di->bat_cap.prev_mah = 1;
1206                         di->bat_cap.mah = 1;
1207
1208                         changed = true;
1209                 } else if (!(!di->flags.charging &&
1210                         (di->bat_cap.permille / 10) >
1211                         di->bat_cap.prev_percent) || init) {
1212                         /*
1213                          * We do not allow reported capacity to go up
1214                          * unless we're charging or if we're in init
1215                          */
1216                         dev_dbg(di->dev,
1217                                 "capacity changed from %d to %d (%d)\n",
1218                                 di->bat_cap.prev_percent,
1219                                 di->bat_cap.permille / 10,
1220                                 di->bat_cap.permille);
1221                         di->bat_cap.prev_percent = di->bat_cap.permille / 10;
1222                         di->bat_cap.prev_mah = di->bat_cap.mah;
1223
1224                         changed = true;
1225                 } else {
1226                         dev_dbg(di->dev, "capacity not allowed to go up since "
1227                                 "no charger is connected: %d to %d (%d)\n",
1228                                 di->bat_cap.prev_percent,
1229                                 di->bat_cap.permille / 10,
1230                                 di->bat_cap.permille);
1231                 }
1232         }
1233
1234         if (changed) {
1235                 power_supply_changed(&di->fg_psy);
1236                 if (di->flags.fully_charged && di->flags.force_full) {
1237                         dev_dbg(di->dev, "Battery full, notifying.\n");
1238                         di->flags.force_full = false;
1239                         sysfs_notify(&di->fg_kobject, NULL, "charge_full");
1240                 }
1241                 sysfs_notify(&di->fg_kobject, NULL, "charge_now");
1242         }
1243 }
1244
1245 static void ab8500_fg_charge_state_to(struct ab8500_fg *di,
1246         enum ab8500_fg_charge_state new_state)
1247 {
1248         dev_dbg(di->dev, "Charge state from %d [%s] to %d [%s]\n",
1249                 di->charge_state,
1250                 charge_state[di->charge_state],
1251                 new_state,
1252                 charge_state[new_state]);
1253
1254         di->charge_state = new_state;
1255 }
1256
1257 static void ab8500_fg_discharge_state_to(struct ab8500_fg *di,
1258         enum ab8500_fg_discharge_state new_state)
1259 {
1260         dev_dbg(di->dev, "Disharge state from %d [%s] to %d [%s]\n",
1261                 di->discharge_state,
1262                 discharge_state[di->discharge_state],
1263                 new_state,
1264                 discharge_state[new_state]);
1265
1266         di->discharge_state = new_state;
1267 }
1268
1269 /**
1270  * ab8500_fg_algorithm_charging() - FG algorithm for when charging
1271  * @di:         pointer to the ab8500_fg structure
1272  *
1273  * Battery capacity calculation state machine for when we're charging
1274  */
1275 static void ab8500_fg_algorithm_charging(struct ab8500_fg *di)
1276 {
1277         /*
1278          * If we change to discharge mode
1279          * we should start with recovery
1280          */
1281         if (di->discharge_state != AB8500_FG_DISCHARGE_INIT_RECOVERY)
1282                 ab8500_fg_discharge_state_to(di,
1283                         AB8500_FG_DISCHARGE_INIT_RECOVERY);
1284
1285         switch (di->charge_state) {
1286         case AB8500_FG_CHARGE_INIT:
1287                 di->fg_samples = SEC_TO_SAMPLE(
1288                         di->bat->fg_params->accu_charging);
1289
1290                 ab8500_fg_coulomb_counter(di, true);
1291                 ab8500_fg_charge_state_to(di, AB8500_FG_CHARGE_READOUT);
1292
1293                 break;
1294
1295         case AB8500_FG_CHARGE_READOUT:
1296                 /*
1297                  * Read the FG and calculate the new capacity
1298                  */
1299                 mutex_lock(&di->cc_lock);
1300                 if (!di->flags.conv_done) {
1301                         /* Wasn't the CC IRQ that got us here */
1302                         mutex_unlock(&di->cc_lock);
1303                         dev_dbg(di->dev, "%s CC conv not done\n",
1304                                 __func__);
1305
1306                         break;
1307                 }
1308                 di->flags.conv_done = false;
1309                 mutex_unlock(&di->cc_lock);
1310
1311                 ab8500_fg_calc_cap_charging(di);
1312
1313                 break;
1314
1315         default:
1316                 break;
1317         }
1318
1319         /* Check capacity limits */
1320         ab8500_fg_check_capacity_limits(di, false);
1321 }
1322
1323 static void force_capacity(struct ab8500_fg *di)
1324 {
1325         int cap;
1326
1327         ab8500_fg_clear_cap_samples(di);
1328         cap = di->bat_cap.user_mah;
1329         if (cap > di->bat_cap.max_mah_design) {
1330                 dev_dbg(di->dev, "Remaining cap %d can't be bigger than total"
1331                         " %d\n", cap, di->bat_cap.max_mah_design);
1332                 cap = di->bat_cap.max_mah_design;
1333         }
1334         ab8500_fg_fill_cap_sample(di, di->bat_cap.user_mah);
1335         di->bat_cap.permille = ab8500_fg_convert_mah_to_permille(di, cap);
1336         di->bat_cap.mah = cap;
1337         ab8500_fg_check_capacity_limits(di, true);
1338 }
1339
1340 static bool check_sysfs_capacity(struct ab8500_fg *di)
1341 {
1342         int cap, lower, upper;
1343         int cap_permille;
1344
1345         cap = di->bat_cap.user_mah;
1346
1347         cap_permille = ab8500_fg_convert_mah_to_permille(di,
1348                 di->bat_cap.user_mah);
1349
1350         lower = di->bat_cap.permille - di->bat->fg_params->user_cap_limit * 10;
1351         upper = di->bat_cap.permille + di->bat->fg_params->user_cap_limit * 10;
1352
1353         if (lower < 0)
1354                 lower = 0;
1355         /* 1000 is permille, -> 100 percent */
1356         if (upper > 1000)
1357                 upper = 1000;
1358
1359         dev_dbg(di->dev, "Capacity limits:"
1360                 " (Lower: %d User: %d Upper: %d) [user: %d, was: %d]\n",
1361                 lower, cap_permille, upper, cap, di->bat_cap.mah);
1362
1363         /* If within limits, use the saved capacity and exit estimation...*/
1364         if (cap_permille > lower && cap_permille < upper) {
1365                 dev_dbg(di->dev, "OK! Using users cap %d uAh now\n", cap);
1366                 force_capacity(di);
1367                 return true;
1368         }
1369         dev_dbg(di->dev, "Capacity from user out of limits, ignoring");
1370         return false;
1371 }
1372
1373 /**
1374  * ab8500_fg_algorithm_discharging() - FG algorithm for when discharging
1375  * @di:         pointer to the ab8500_fg structure
1376  *
1377  * Battery capacity calculation state machine for when we're discharging
1378  */
1379 static void ab8500_fg_algorithm_discharging(struct ab8500_fg *di)
1380 {
1381         int sleep_time;
1382
1383         /* If we change to charge mode we should start with init */
1384         if (di->charge_state != AB8500_FG_CHARGE_INIT)
1385                 ab8500_fg_charge_state_to(di, AB8500_FG_CHARGE_INIT);
1386
1387         switch (di->discharge_state) {
1388         case AB8500_FG_DISCHARGE_INIT:
1389                 /* We use the FG IRQ to work on */
1390                 di->init_cnt = 0;
1391                 di->fg_samples = SEC_TO_SAMPLE(di->bat->fg_params->init_timer);
1392                 ab8500_fg_coulomb_counter(di, true);
1393                 ab8500_fg_discharge_state_to(di,
1394                         AB8500_FG_DISCHARGE_INITMEASURING);
1395
1396                 /* Intentional fallthrough */
1397         case AB8500_FG_DISCHARGE_INITMEASURING:
1398                 /*
1399                  * Discard a number of samples during startup.
1400                  * After that, use compensated voltage for a few
1401                  * samples to get an initial capacity.
1402                  * Then go to READOUT
1403                  */
1404                 sleep_time = di->bat->fg_params->init_timer;
1405
1406                 /* Discard the first [x] seconds */
1407                 if (di->init_cnt >
1408                         di->bat->fg_params->init_discard_time) {
1409                         ab8500_fg_calc_cap_discharge_voltage(di, true);
1410
1411                         ab8500_fg_check_capacity_limits(di, true);
1412                 }
1413
1414                 di->init_cnt += sleep_time;
1415                 if (di->init_cnt > di->bat->fg_params->init_total_time)
1416                         ab8500_fg_discharge_state_to(di,
1417                                 AB8500_FG_DISCHARGE_READOUT_INIT);
1418
1419                 break;
1420
1421         case AB8500_FG_DISCHARGE_INIT_RECOVERY:
1422                 di->recovery_cnt = 0;
1423                 di->recovery_needed = true;
1424                 ab8500_fg_discharge_state_to(di,
1425                         AB8500_FG_DISCHARGE_RECOVERY);
1426
1427                 /* Intentional fallthrough */
1428
1429         case AB8500_FG_DISCHARGE_RECOVERY:
1430                 sleep_time = di->bat->fg_params->recovery_sleep_timer;
1431
1432                 /*
1433                  * We should check the power consumption
1434                  * If low, go to READOUT (after x min) or
1435                  * RECOVERY_SLEEP if time left.
1436                  * If high, go to READOUT
1437                  */
1438                 di->inst_curr = ab8500_fg_inst_curr_blocking(di);
1439
1440                 if (ab8500_fg_is_low_curr(di, di->inst_curr)) {
1441                         if (di->recovery_cnt >
1442                                 di->bat->fg_params->recovery_total_time) {
1443                                 di->fg_samples = SEC_TO_SAMPLE(
1444                                         di->bat->fg_params->accu_high_curr);
1445                                 ab8500_fg_coulomb_counter(di, true);
1446                                 ab8500_fg_discharge_state_to(di,
1447                                         AB8500_FG_DISCHARGE_READOUT);
1448                                 di->recovery_needed = false;
1449                         } else {
1450                                 queue_delayed_work(di->fg_wq,
1451                                         &di->fg_periodic_work,
1452                                         sleep_time * HZ);
1453                         }
1454                         di->recovery_cnt += sleep_time;
1455                 } else {
1456                         di->fg_samples = SEC_TO_SAMPLE(
1457                                 di->bat->fg_params->accu_high_curr);
1458                         ab8500_fg_coulomb_counter(di, true);
1459                         ab8500_fg_discharge_state_to(di,
1460                                 AB8500_FG_DISCHARGE_READOUT);
1461                 }
1462                 break;
1463
1464         case AB8500_FG_DISCHARGE_READOUT_INIT:
1465                 di->fg_samples = SEC_TO_SAMPLE(
1466                         di->bat->fg_params->accu_high_curr);
1467                 ab8500_fg_coulomb_counter(di, true);
1468                 ab8500_fg_discharge_state_to(di,
1469                                 AB8500_FG_DISCHARGE_READOUT);
1470                 break;
1471
1472         case AB8500_FG_DISCHARGE_READOUT:
1473                 di->inst_curr = ab8500_fg_inst_curr_blocking(di);
1474
1475                 if (ab8500_fg_is_low_curr(di, di->inst_curr)) {
1476                         /* Detect mode change */
1477                         if (di->high_curr_mode) {
1478                                 di->high_curr_mode = false;
1479                                 di->high_curr_cnt = 0;
1480                         }
1481
1482                         if (di->recovery_needed) {
1483                                 ab8500_fg_discharge_state_to(di,
1484                                         AB8500_FG_DISCHARGE_RECOVERY);
1485
1486                                 queue_delayed_work(di->fg_wq,
1487                                         &di->fg_periodic_work, 0);
1488
1489                                 break;
1490                         }
1491
1492                         ab8500_fg_calc_cap_discharge_voltage(di, true);
1493                 } else {
1494                         mutex_lock(&di->cc_lock);
1495                         if (!di->flags.conv_done) {
1496                                 /* Wasn't the CC IRQ that got us here */
1497                                 mutex_unlock(&di->cc_lock);
1498                                 dev_dbg(di->dev, "%s CC conv not done\n",
1499                                         __func__);
1500
1501                                 break;
1502                         }
1503                         di->flags.conv_done = false;
1504                         mutex_unlock(&di->cc_lock);
1505
1506                         /* Detect mode change */
1507                         if (!di->high_curr_mode) {
1508                                 di->high_curr_mode = true;
1509                                 di->high_curr_cnt = 0;
1510                         }
1511
1512                         di->high_curr_cnt +=
1513                                 di->bat->fg_params->accu_high_curr;
1514                         if (di->high_curr_cnt >
1515                                 di->bat->fg_params->high_curr_time)
1516                                 di->recovery_needed = true;
1517
1518                         ab8500_fg_calc_cap_discharge_fg(di);
1519                 }
1520
1521                 ab8500_fg_check_capacity_limits(di, false);
1522
1523                 break;
1524
1525         case AB8500_FG_DISCHARGE_WAKEUP:
1526                 ab8500_fg_coulomb_counter(di, true);
1527                 di->inst_curr = ab8500_fg_inst_curr_blocking(di);
1528
1529                 ab8500_fg_calc_cap_discharge_voltage(di, true);
1530
1531                 di->fg_samples = SEC_TO_SAMPLE(
1532                         di->bat->fg_params->accu_high_curr);
1533                 ab8500_fg_coulomb_counter(di, true);
1534                 ab8500_fg_discharge_state_to(di,
1535                                 AB8500_FG_DISCHARGE_READOUT);
1536
1537                 ab8500_fg_check_capacity_limits(di, false);
1538
1539                 break;
1540
1541         default:
1542                 break;
1543         }
1544 }
1545
1546 /**
1547  * ab8500_fg_algorithm_calibrate() - Internal columb counter offset calibration
1548  * @di:         pointer to the ab8500_fg structure
1549  *
1550  */
1551 static void ab8500_fg_algorithm_calibrate(struct ab8500_fg *di)
1552 {
1553         int ret;
1554
1555         switch (di->calib_state) {
1556         case AB8500_FG_CALIB_INIT:
1557                 dev_dbg(di->dev, "Calibration ongoing...\n");
1558
1559                 ret = abx500_mask_and_set_register_interruptible(di->dev,
1560                         AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG,
1561                         CC_INT_CAL_N_AVG_MASK, CC_INT_CAL_SAMPLES_8);
1562                 if (ret < 0)
1563                         goto err;
1564
1565                 ret = abx500_mask_and_set_register_interruptible(di->dev,
1566                         AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG,
1567                         CC_INTAVGOFFSET_ENA, CC_INTAVGOFFSET_ENA);
1568                 if (ret < 0)
1569                         goto err;
1570                 di->calib_state = AB8500_FG_CALIB_WAIT;
1571                 break;
1572         case AB8500_FG_CALIB_END:
1573                 ret = abx500_mask_and_set_register_interruptible(di->dev,
1574                         AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG,
1575                         CC_MUXOFFSET, CC_MUXOFFSET);
1576                 if (ret < 0)
1577                         goto err;
1578                 di->flags.calibrate = false;
1579                 dev_dbg(di->dev, "Calibration done...\n");
1580                 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
1581                 break;
1582         case AB8500_FG_CALIB_WAIT:
1583                 dev_dbg(di->dev, "Calibration WFI\n");
1584         default:
1585                 break;
1586         }
1587         return;
1588 err:
1589         /* Something went wrong, don't calibrate then */
1590         dev_err(di->dev, "failed to calibrate the CC\n");
1591         di->flags.calibrate = false;
1592         di->calib_state = AB8500_FG_CALIB_INIT;
1593         queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
1594 }
1595
1596 /**
1597  * ab8500_fg_algorithm() - Entry point for the FG algorithm
1598  * @di:         pointer to the ab8500_fg structure
1599  *
1600  * Entry point for the battery capacity calculation state machine
1601  */
1602 static void ab8500_fg_algorithm(struct ab8500_fg *di)
1603 {
1604         if (di->flags.calibrate)
1605                 ab8500_fg_algorithm_calibrate(di);
1606         else {
1607                 if (di->flags.charging)
1608                         ab8500_fg_algorithm_charging(di);
1609                 else
1610                         ab8500_fg_algorithm_discharging(di);
1611         }
1612
1613         dev_dbg(di->dev, "[FG_DATA] %d %d %d %d %d %d %d %d %d "
1614                 "%d %d %d %d %d %d %d\n",
1615                 di->bat_cap.max_mah_design,
1616                 di->bat_cap.mah,
1617                 di->bat_cap.permille,
1618                 di->bat_cap.level,
1619                 di->bat_cap.prev_mah,
1620                 di->bat_cap.prev_percent,
1621                 di->bat_cap.prev_level,
1622                 di->vbat,
1623                 di->inst_curr,
1624                 di->avg_curr,
1625                 di->accu_charge,
1626                 di->flags.charging,
1627                 di->charge_state,
1628                 di->discharge_state,
1629                 di->high_curr_mode,
1630                 di->recovery_needed);
1631 }
1632
1633 /**
1634  * ab8500_fg_periodic_work() - Run the FG state machine periodically
1635  * @work:       pointer to the work_struct structure
1636  *
1637  * Work queue function for periodic work
1638  */
1639 static void ab8500_fg_periodic_work(struct work_struct *work)
1640 {
1641         struct ab8500_fg *di = container_of(work, struct ab8500_fg,
1642                 fg_periodic_work.work);
1643
1644         if (di->init_capacity) {
1645                 /* A dummy read that will return 0 */
1646                 di->inst_curr = ab8500_fg_inst_curr_blocking(di);
1647                 /* Get an initial capacity calculation */
1648                 ab8500_fg_calc_cap_discharge_voltage(di, true);
1649                 ab8500_fg_check_capacity_limits(di, true);
1650                 di->init_capacity = false;
1651
1652                 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
1653         } else if (di->flags.user_cap) {
1654                 if (check_sysfs_capacity(di)) {
1655                         ab8500_fg_check_capacity_limits(di, true);
1656                         if (di->flags.charging)
1657                                 ab8500_fg_charge_state_to(di,
1658                                         AB8500_FG_CHARGE_INIT);
1659                         else
1660                                 ab8500_fg_discharge_state_to(di,
1661                                         AB8500_FG_DISCHARGE_READOUT_INIT);
1662                 }
1663                 di->flags.user_cap = false;
1664                 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
1665         } else
1666                 ab8500_fg_algorithm(di);
1667
1668 }
1669
1670 /**
1671  * ab8500_fg_check_hw_failure_work() - Check OVV_BAT condition
1672  * @work:       pointer to the work_struct structure
1673  *
1674  * Work queue function for checking the OVV_BAT condition
1675  */
1676 static void ab8500_fg_check_hw_failure_work(struct work_struct *work)
1677 {
1678         int ret;
1679         u8 reg_value;
1680
1681         struct ab8500_fg *di = container_of(work, struct ab8500_fg,
1682                 fg_check_hw_failure_work.work);
1683
1684         /*
1685          * If we have had a battery over-voltage situation,
1686          * check ovv-bit to see if it should be reset.
1687          */
1688         if (di->flags.bat_ovv) {
1689                 ret = abx500_get_register_interruptible(di->dev,
1690                         AB8500_CHARGER, AB8500_CH_STAT_REG,
1691                         &reg_value);
1692                 if (ret < 0) {
1693                         dev_err(di->dev, "%s ab8500 read failed\n", __func__);
1694                         return;
1695                 }
1696                 if ((reg_value & BATT_OVV) != BATT_OVV) {
1697                         dev_dbg(di->dev, "Battery recovered from OVV\n");
1698                         di->flags.bat_ovv = false;
1699                         power_supply_changed(&di->fg_psy);
1700                         return;
1701                 }
1702
1703                 /* Not yet recovered from ovv, reschedule this test */
1704                 queue_delayed_work(di->fg_wq, &di->fg_check_hw_failure_work,
1705                                    round_jiffies(HZ));
1706         }
1707 }
1708
1709 /**
1710  * ab8500_fg_low_bat_work() - Check LOW_BAT condition
1711  * @work:       pointer to the work_struct structure
1712  *
1713  * Work queue function for checking the LOW_BAT condition
1714  */
1715 static void ab8500_fg_low_bat_work(struct work_struct *work)
1716 {
1717         int vbat;
1718
1719         struct ab8500_fg *di = container_of(work, struct ab8500_fg,
1720                 fg_low_bat_work.work);
1721
1722         vbat = ab8500_fg_bat_voltage(di);
1723
1724         /* Check if LOW_BAT still fulfilled */
1725         if (vbat < di->bat->fg_params->lowbat_threshold) {
1726                 di->flags.low_bat = true;
1727                 dev_warn(di->dev, "Battery voltage still LOW\n");
1728
1729                 /*
1730                  * We need to re-schedule this check to be able to detect
1731                  * if the voltage increases again during charging
1732                  */
1733                 queue_delayed_work(di->fg_wq, &di->fg_low_bat_work,
1734                         round_jiffies(LOW_BAT_CHECK_INTERVAL));
1735         } else {
1736                 di->flags.low_bat = false;
1737                 dev_warn(di->dev, "Battery voltage OK again\n");
1738         }
1739
1740         /* This is needed to dispatch LOW_BAT */
1741         ab8500_fg_check_capacity_limits(di, false);
1742
1743         /* Set this flag to check if LOW_BAT IRQ still occurs */
1744         di->flags.low_bat_delay = false;
1745 }
1746
1747 /**
1748  * ab8500_fg_battok_calc - calculate the bit pattern corresponding
1749  * to the target voltage.
1750  * @di:       pointer to the ab8500_fg structure
1751  * @target    target voltage
1752  *
1753  * Returns bit pattern closest to the target voltage
1754  * valid return values are 0-14. (0-BATT_OK_MAX_NR_INCREMENTS)
1755  */
1756
1757 static int ab8500_fg_battok_calc(struct ab8500_fg *di, int target)
1758 {
1759         if (target > BATT_OK_MIN +
1760                 (BATT_OK_INCREMENT * BATT_OK_MAX_NR_INCREMENTS))
1761                 return BATT_OK_MAX_NR_INCREMENTS;
1762         if (target < BATT_OK_MIN)
1763                 return 0;
1764         return (target - BATT_OK_MIN) / BATT_OK_INCREMENT;
1765 }
1766
1767 /**
1768  * ab8500_fg_battok_init_hw_register - init battok levels
1769  * @di:       pointer to the ab8500_fg structure
1770  *
1771  */
1772
1773 static int ab8500_fg_battok_init_hw_register(struct ab8500_fg *di)
1774 {
1775         int selected;
1776         int sel0;
1777         int sel1;
1778         int cbp_sel0;
1779         int cbp_sel1;
1780         int ret;
1781         int new_val;
1782
1783         sel0 = di->bat->fg_params->battok_falling_th_sel0;
1784         sel1 = di->bat->fg_params->battok_raising_th_sel1;
1785
1786         cbp_sel0 = ab8500_fg_battok_calc(di, sel0);
1787         cbp_sel1 = ab8500_fg_battok_calc(di, sel1);
1788
1789         selected = BATT_OK_MIN + cbp_sel0 * BATT_OK_INCREMENT;
1790
1791         if (selected != sel0)
1792                 dev_warn(di->dev, "Invalid voltage step:%d, using %d %d\n",
1793                         sel0, selected, cbp_sel0);
1794
1795         selected = BATT_OK_MIN + cbp_sel1 * BATT_OK_INCREMENT;
1796
1797         if (selected != sel1)
1798                 dev_warn(di->dev, "Invalid voltage step:%d, using %d %d\n",
1799                         sel1, selected, cbp_sel1);
1800
1801         new_val = cbp_sel0 | (cbp_sel1 << 4);
1802
1803         dev_dbg(di->dev, "using: %x %d %d\n", new_val, cbp_sel0, cbp_sel1);
1804         ret = abx500_set_register_interruptible(di->dev, AB8500_SYS_CTRL2_BLOCK,
1805                 AB8500_BATT_OK_REG, new_val);
1806         return ret;
1807 }
1808
1809 /**
1810  * ab8500_fg_instant_work() - Run the FG state machine instantly
1811  * @work:       pointer to the work_struct structure
1812  *
1813  * Work queue function for instant work
1814  */
1815 static void ab8500_fg_instant_work(struct work_struct *work)
1816 {
1817         struct ab8500_fg *di = container_of(work, struct ab8500_fg, fg_work);
1818
1819         ab8500_fg_algorithm(di);
1820 }
1821
1822 /**
1823  * ab8500_fg_cc_data_end_handler() - isr to get battery avg current.
1824  * @irq:       interrupt number
1825  * @_di:       pointer to the ab8500_fg structure
1826  *
1827  * Returns IRQ status(IRQ_HANDLED)
1828  */
1829 static irqreturn_t ab8500_fg_cc_data_end_handler(int irq, void *_di)
1830 {
1831         struct ab8500_fg *di = _di;
1832         complete(&di->ab8500_fg_complete);
1833         return IRQ_HANDLED;
1834 }
1835
1836 /**
1837  * ab8500_fg_cc_convend_handler() - isr to get battery avg current.
1838  * @irq:       interrupt number
1839  * @_di:       pointer to the ab8500_fg structure
1840  *
1841  * Returns IRQ status(IRQ_HANDLED)
1842  */
1843 static irqreturn_t ab8500_fg_cc_int_calib_handler(int irq, void *_di)
1844 {
1845         struct ab8500_fg *di = _di;
1846         di->calib_state = AB8500_FG_CALIB_END;
1847         queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
1848         return IRQ_HANDLED;
1849 }
1850
1851 /**
1852  * ab8500_fg_cc_convend_handler() - isr to get battery avg current.
1853  * @irq:       interrupt number
1854  * @_di:       pointer to the ab8500_fg structure
1855  *
1856  * Returns IRQ status(IRQ_HANDLED)
1857  */
1858 static irqreturn_t ab8500_fg_cc_convend_handler(int irq, void *_di)
1859 {
1860         struct ab8500_fg *di = _di;
1861
1862         queue_work(di->fg_wq, &di->fg_acc_cur_work);
1863
1864         return IRQ_HANDLED;
1865 }
1866
1867 /**
1868  * ab8500_fg_batt_ovv_handler() - Battery OVV occured
1869  * @irq:       interrupt number
1870  * @_di:       pointer to the ab8500_fg structure
1871  *
1872  * Returns IRQ status(IRQ_HANDLED)
1873  */
1874 static irqreturn_t ab8500_fg_batt_ovv_handler(int irq, void *_di)
1875 {
1876         struct ab8500_fg *di = _di;
1877
1878         dev_dbg(di->dev, "Battery OVV\n");
1879         di->flags.bat_ovv = true;
1880         power_supply_changed(&di->fg_psy);
1881
1882         /* Schedule a new HW failure check */
1883         queue_delayed_work(di->fg_wq, &di->fg_check_hw_failure_work, 0);
1884
1885         return IRQ_HANDLED;
1886 }
1887
1888 /**
1889  * ab8500_fg_lowbatf_handler() - Battery voltage is below LOW threshold
1890  * @irq:       interrupt number
1891  * @_di:       pointer to the ab8500_fg structure
1892  *
1893  * Returns IRQ status(IRQ_HANDLED)
1894  */
1895 static irqreturn_t ab8500_fg_lowbatf_handler(int irq, void *_di)
1896 {
1897         struct ab8500_fg *di = _di;
1898
1899         if (!di->flags.low_bat_delay) {
1900                 dev_warn(di->dev, "Battery voltage is below LOW threshold\n");
1901                 di->flags.low_bat_delay = true;
1902                 /*
1903                  * Start a timer to check LOW_BAT again after some time
1904                  * This is done to avoid shutdown on single voltage dips
1905                  */
1906                 queue_delayed_work(di->fg_wq, &di->fg_low_bat_work,
1907                         round_jiffies(LOW_BAT_CHECK_INTERVAL));
1908         }
1909         return IRQ_HANDLED;
1910 }
1911
1912 /**
1913  * ab8500_fg_get_property() - get the fg properties
1914  * @psy:        pointer to the power_supply structure
1915  * @psp:        pointer to the power_supply_property structure
1916  * @val:        pointer to the power_supply_propval union
1917  *
1918  * This function gets called when an application tries to get the
1919  * fg properties by reading the sysfs files.
1920  * voltage_now:         battery voltage
1921  * current_now:         battery instant current
1922  * current_avg:         battery average current
1923  * charge_full_design:  capacity where battery is considered full
1924  * charge_now:          battery capacity in nAh
1925  * capacity:            capacity in percent
1926  * capacity_level:      capacity level
1927  *
1928  * Returns error code in case of failure else 0 on success
1929  */
1930 static int ab8500_fg_get_property(struct power_supply *psy,
1931         enum power_supply_property psp,
1932         union power_supply_propval *val)
1933 {
1934         struct ab8500_fg *di;
1935
1936         di = to_ab8500_fg_device_info(psy);
1937
1938         /*
1939          * If battery is identified as unknown and charging of unknown
1940          * batteries is disabled, we always report 100% capacity and
1941          * capacity level UNKNOWN, since we can't calculate
1942          * remaining capacity
1943          */
1944
1945         switch (psp) {
1946         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
1947                 if (di->flags.bat_ovv)
1948                         val->intval = BATT_OVV_VALUE * 1000;
1949                 else
1950                         val->intval = di->vbat * 1000;
1951                 break;
1952         case POWER_SUPPLY_PROP_CURRENT_NOW:
1953                 val->intval = di->inst_curr * 1000;
1954                 break;
1955         case POWER_SUPPLY_PROP_CURRENT_AVG:
1956                 val->intval = di->avg_curr * 1000;
1957                 break;
1958         case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
1959                 val->intval = ab8500_fg_convert_mah_to_uwh(di,
1960                                 di->bat_cap.max_mah_design);
1961                 break;
1962         case POWER_SUPPLY_PROP_ENERGY_FULL:
1963                 val->intval = ab8500_fg_convert_mah_to_uwh(di,
1964                                 di->bat_cap.max_mah);
1965                 break;
1966         case POWER_SUPPLY_PROP_ENERGY_NOW:
1967                 if (di->flags.batt_unknown && !di->bat->chg_unknown_bat &&
1968                                 di->flags.batt_id_received)
1969                         val->intval = ab8500_fg_convert_mah_to_uwh(di,
1970                                         di->bat_cap.max_mah);
1971                 else
1972                         val->intval = ab8500_fg_convert_mah_to_uwh(di,
1973                                         di->bat_cap.prev_mah);
1974                 break;
1975         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
1976                 val->intval = di->bat_cap.max_mah_design;
1977                 break;
1978         case POWER_SUPPLY_PROP_CHARGE_FULL:
1979                 val->intval = di->bat_cap.max_mah;
1980                 break;
1981         case POWER_SUPPLY_PROP_CHARGE_NOW:
1982                 if (di->flags.batt_unknown && !di->bat->chg_unknown_bat &&
1983                                 di->flags.batt_id_received)
1984                         val->intval = di->bat_cap.max_mah;
1985                 else
1986                         val->intval = di->bat_cap.prev_mah;
1987                 break;
1988         case POWER_SUPPLY_PROP_CAPACITY:
1989                 if (di->flags.batt_unknown && !di->bat->chg_unknown_bat &&
1990                                 di->flags.batt_id_received)
1991                         val->intval = 100;
1992                 else
1993                         val->intval = di->bat_cap.prev_percent;
1994                 break;
1995         case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
1996                 if (di->flags.batt_unknown && !di->bat->chg_unknown_bat &&
1997                                 di->flags.batt_id_received)
1998                         val->intval = POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN;
1999                 else
2000                         val->intval = di->bat_cap.prev_level;
2001                 break;
2002         default:
2003                 return -EINVAL;
2004         }
2005         return 0;
2006 }
2007
2008 static int ab8500_fg_get_ext_psy_data(struct device *dev, void *data)
2009 {
2010         struct power_supply *psy;
2011         struct power_supply *ext;
2012         struct ab8500_fg *di;
2013         union power_supply_propval ret;
2014         int i, j;
2015         bool psy_found = false;
2016
2017         psy = (struct power_supply *)data;
2018         ext = dev_get_drvdata(dev);
2019         di = to_ab8500_fg_device_info(psy);
2020
2021         /*
2022          * For all psy where the name of your driver
2023          * appears in any supplied_to
2024          */
2025         for (i = 0; i < ext->num_supplicants; i++) {
2026                 if (!strcmp(ext->supplied_to[i], psy->name))
2027                         psy_found = true;
2028         }
2029
2030         if (!psy_found)
2031                 return 0;
2032
2033         /* Go through all properties for the psy */
2034         for (j = 0; j < ext->num_properties; j++) {
2035                 enum power_supply_property prop;
2036                 prop = ext->properties[j];
2037
2038                 if (ext->get_property(ext, prop, &ret))
2039                         continue;
2040
2041                 switch (prop) {
2042                 case POWER_SUPPLY_PROP_STATUS:
2043                         switch (ext->type) {
2044                         case POWER_SUPPLY_TYPE_BATTERY:
2045                                 switch (ret.intval) {
2046                                 case POWER_SUPPLY_STATUS_UNKNOWN:
2047                                 case POWER_SUPPLY_STATUS_DISCHARGING:
2048                                 case POWER_SUPPLY_STATUS_NOT_CHARGING:
2049                                         if (!di->flags.charging)
2050                                                 break;
2051                                         di->flags.charging = false;
2052                                         di->flags.fully_charged = false;
2053                                         queue_work(di->fg_wq, &di->fg_work);
2054                                         break;
2055                                 case POWER_SUPPLY_STATUS_FULL:
2056                                         if (di->flags.fully_charged)
2057                                                 break;
2058                                         di->flags.fully_charged = true;
2059                                         di->flags.force_full = true;
2060                                         /* Save current capacity as maximum */
2061                                         di->bat_cap.max_mah = di->bat_cap.mah;
2062                                         queue_work(di->fg_wq, &di->fg_work);
2063                                         break;
2064                                 case POWER_SUPPLY_STATUS_CHARGING:
2065                                         if (di->flags.charging)
2066                                                 break;
2067                                         di->flags.charging = true;
2068                                         di->flags.fully_charged = false;
2069                                         queue_work(di->fg_wq, &di->fg_work);
2070                                         break;
2071                                 };
2072                         default:
2073                                 break;
2074                         };
2075                         break;
2076                 case POWER_SUPPLY_PROP_TECHNOLOGY:
2077                         switch (ext->type) {
2078                         case POWER_SUPPLY_TYPE_BATTERY:
2079                                 if (!di->flags.batt_id_received) {
2080                                         const struct abx500_battery_type *b;
2081
2082                                         b = &(di->bat->bat_type[di->bat->batt_id]);
2083
2084                                         di->flags.batt_id_received = true;
2085
2086                                         di->bat_cap.max_mah_design =
2087                                                 MILLI_TO_MICRO *
2088                                                 b->charge_full_design;
2089
2090                                         di->bat_cap.max_mah =
2091                                                 di->bat_cap.max_mah_design;
2092
2093                                         di->vbat_nom = b->nominal_voltage;
2094                                 }
2095
2096                                 if (ret.intval)
2097                                         di->flags.batt_unknown = false;
2098                                 else
2099                                         di->flags.batt_unknown = true;
2100                                 break;
2101                         default:
2102                                 break;
2103                         }
2104                         break;
2105                 case POWER_SUPPLY_PROP_TEMP:
2106                         switch (ext->type) {
2107                         case POWER_SUPPLY_TYPE_BATTERY:
2108                             if (di->flags.batt_id_received)
2109                                 di->bat_temp = ret.intval;
2110                                 break;
2111                         default:
2112                                 break;
2113                         }
2114                         break;
2115                 default:
2116                         break;
2117                 }
2118         }
2119         return 0;
2120 }
2121
2122 /**
2123  * ab8500_fg_init_hw_registers() - Set up FG related registers
2124  * @di:         pointer to the ab8500_fg structure
2125  *
2126  * Set up battery OVV, low battery voltage registers
2127  */
2128 static int ab8500_fg_init_hw_registers(struct ab8500_fg *di)
2129 {
2130         int ret;
2131
2132         /* Set VBAT OVV threshold */
2133         ret = abx500_mask_and_set_register_interruptible(di->dev,
2134                 AB8500_CHARGER,
2135                 AB8500_BATT_OVV,
2136                 BATT_OVV_TH_4P75,
2137                 BATT_OVV_TH_4P75);
2138         if (ret) {
2139                 dev_err(di->dev, "failed to set BATT_OVV\n");
2140                 goto out;
2141         }
2142
2143         /* Enable VBAT OVV detection */
2144         ret = abx500_mask_and_set_register_interruptible(di->dev,
2145                 AB8500_CHARGER,
2146                 AB8500_BATT_OVV,
2147                 BATT_OVV_ENA,
2148                 BATT_OVV_ENA);
2149         if (ret) {
2150                 dev_err(di->dev, "failed to enable BATT_OVV\n");
2151                 goto out;
2152         }
2153
2154         /* Low Battery Voltage */
2155         ret = abx500_set_register_interruptible(di->dev,
2156                 AB8500_SYS_CTRL2_BLOCK,
2157                 AB8500_LOW_BAT_REG,
2158                 ab8500_volt_to_regval(
2159                         di->bat->fg_params->lowbat_threshold) << 1 |
2160                 LOW_BAT_ENABLE);
2161         if (ret) {
2162                 dev_err(di->dev, "%s write failed\n", __func__);
2163                 goto out;
2164         }
2165
2166         /* Battery OK threshold */
2167         ret = ab8500_fg_battok_init_hw_register(di);
2168         if (ret) {
2169                 dev_err(di->dev, "BattOk init write failed.\n");
2170                 goto out;
2171         }
2172 out:
2173         return ret;
2174 }
2175
2176 /**
2177  * ab8500_fg_external_power_changed() - callback for power supply changes
2178  * @psy:       pointer to the structure power_supply
2179  *
2180  * This function is the entry point of the pointer external_power_changed
2181  * of the structure power_supply.
2182  * This function gets executed when there is a change in any external power
2183  * supply that this driver needs to be notified of.
2184  */
2185 static void ab8500_fg_external_power_changed(struct power_supply *psy)
2186 {
2187         struct ab8500_fg *di = to_ab8500_fg_device_info(psy);
2188
2189         class_for_each_device(power_supply_class, NULL,
2190                 &di->fg_psy, ab8500_fg_get_ext_psy_data);
2191 }
2192
2193 /**
2194  * abab8500_fg_reinit_work() - work to reset the FG algorithm
2195  * @work:       pointer to the work_struct structure
2196  *
2197  * Used to reset the current battery capacity to be able to
2198  * retrigger a new voltage base capacity calculation. For
2199  * test and verification purpose.
2200  */
2201 static void ab8500_fg_reinit_work(struct work_struct *work)
2202 {
2203         struct ab8500_fg *di = container_of(work, struct ab8500_fg,
2204                 fg_reinit_work.work);
2205
2206         if (di->flags.calibrate == false) {
2207                 dev_dbg(di->dev, "Resetting FG state machine to init.\n");
2208                 ab8500_fg_clear_cap_samples(di);
2209                 ab8500_fg_calc_cap_discharge_voltage(di, true);
2210                 ab8500_fg_charge_state_to(di, AB8500_FG_CHARGE_INIT);
2211                 ab8500_fg_discharge_state_to(di, AB8500_FG_DISCHARGE_INIT);
2212                 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
2213
2214         } else {
2215                 dev_err(di->dev, "Residual offset calibration ongoing "
2216                         "retrying..\n");
2217                 /* Wait one second until next try*/
2218                 queue_delayed_work(di->fg_wq, &di->fg_reinit_work,
2219                         round_jiffies(1));
2220         }
2221 }
2222
2223 /**
2224  * ab8500_fg_reinit() - forces FG algorithm to reinitialize with current values
2225  *
2226  * This function can be used to force the FG algorithm to recalculate a new
2227  * voltage based battery capacity.
2228  */
2229 void ab8500_fg_reinit(void)
2230 {
2231         struct ab8500_fg *di = ab8500_fg_get();
2232         /* User won't be notified if a null pointer returned. */
2233         if (di != NULL)
2234                 queue_delayed_work(di->fg_wq, &di->fg_reinit_work, 0);
2235 }
2236
2237 /* Exposure to the sysfs interface */
2238
2239 struct ab8500_fg_sysfs_entry {
2240         struct attribute attr;
2241         ssize_t (*show)(struct ab8500_fg *, char *);
2242         ssize_t (*store)(struct ab8500_fg *, const char *, size_t);
2243 };
2244
2245 static ssize_t charge_full_show(struct ab8500_fg *di, char *buf)
2246 {
2247         return sprintf(buf, "%d\n", di->bat_cap.max_mah);
2248 }
2249
2250 static ssize_t charge_full_store(struct ab8500_fg *di, const char *buf,
2251                                  size_t count)
2252 {
2253         unsigned long charge_full;
2254         ssize_t ret = -EINVAL;
2255
2256         ret = strict_strtoul(buf, 10, &charge_full);
2257
2258         dev_dbg(di->dev, "Ret %zd charge_full %lu", ret, charge_full);
2259
2260         if (!ret) {
2261                 di->bat_cap.max_mah = (int) charge_full;
2262                 ret = count;
2263         }
2264         return ret;
2265 }
2266
2267 static ssize_t charge_now_show(struct ab8500_fg *di, char *buf)
2268 {
2269         return sprintf(buf, "%d\n", di->bat_cap.prev_mah);
2270 }
2271
2272 static ssize_t charge_now_store(struct ab8500_fg *di, const char *buf,
2273                                  size_t count)
2274 {
2275         unsigned long charge_now;
2276         ssize_t ret;
2277
2278         ret = strict_strtoul(buf, 10, &charge_now);
2279
2280         dev_dbg(di->dev, "Ret %zd charge_now %lu was %d",
2281                 ret, charge_now, di->bat_cap.prev_mah);
2282
2283         if (!ret) {
2284                 di->bat_cap.user_mah = (int) charge_now;
2285                 di->flags.user_cap = true;
2286                 ret = count;
2287                 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
2288         }
2289         return ret;
2290 }
2291
2292 static struct ab8500_fg_sysfs_entry charge_full_attr =
2293         __ATTR(charge_full, 0644, charge_full_show, charge_full_store);
2294
2295 static struct ab8500_fg_sysfs_entry charge_now_attr =
2296         __ATTR(charge_now, 0644, charge_now_show, charge_now_store);
2297
2298 static ssize_t
2299 ab8500_fg_show(struct kobject *kobj, struct attribute *attr, char *buf)
2300 {
2301         struct ab8500_fg_sysfs_entry *entry;
2302         struct ab8500_fg *di;
2303
2304         entry = container_of(attr, struct ab8500_fg_sysfs_entry, attr);
2305         di = container_of(kobj, struct ab8500_fg, fg_kobject);
2306
2307         if (!entry->show)
2308                 return -EIO;
2309
2310         return entry->show(di, buf);
2311 }
2312 static ssize_t
2313 ab8500_fg_store(struct kobject *kobj, struct attribute *attr, const char *buf,
2314                 size_t count)
2315 {
2316         struct ab8500_fg_sysfs_entry *entry;
2317         struct ab8500_fg *di;
2318
2319         entry = container_of(attr, struct ab8500_fg_sysfs_entry, attr);
2320         di = container_of(kobj, struct ab8500_fg, fg_kobject);
2321
2322         if (!entry->store)
2323                 return -EIO;
2324
2325         return entry->store(di, buf, count);
2326 }
2327
2328 static const struct sysfs_ops ab8500_fg_sysfs_ops = {
2329         .show = ab8500_fg_show,
2330         .store = ab8500_fg_store,
2331 };
2332
2333 static struct attribute *ab8500_fg_attrs[] = {
2334         &charge_full_attr.attr,
2335         &charge_now_attr.attr,
2336         NULL,
2337 };
2338
2339 static struct kobj_type ab8500_fg_ktype = {
2340         .sysfs_ops = &ab8500_fg_sysfs_ops,
2341         .default_attrs = ab8500_fg_attrs,
2342 };
2343
2344 /**
2345  * ab8500_chargalg_sysfs_exit() - de-init of sysfs entry
2346  * @di:                pointer to the struct ab8500_chargalg
2347  *
2348  * This function removes the entry in sysfs.
2349  */
2350 static void ab8500_fg_sysfs_exit(struct ab8500_fg *di)
2351 {
2352         kobject_del(&di->fg_kobject);
2353 }
2354
2355 /**
2356  * ab8500_chargalg_sysfs_init() - init of sysfs entry
2357  * @di:                pointer to the struct ab8500_chargalg
2358  *
2359  * This function adds an entry in sysfs.
2360  * Returns error code in case of failure else 0(on success)
2361  */
2362 static int ab8500_fg_sysfs_init(struct ab8500_fg *di)
2363 {
2364         int ret = 0;
2365
2366         ret = kobject_init_and_add(&di->fg_kobject,
2367                 &ab8500_fg_ktype,
2368                 NULL, "battery");
2369         if (ret < 0)
2370                 dev_err(di->dev, "failed to create sysfs entry\n");
2371
2372         return ret;
2373 }
2374 /* Exposure to the sysfs interface <<END>> */
2375
2376 #if defined(CONFIG_PM)
2377 static int ab8500_fg_resume(struct platform_device *pdev)
2378 {
2379         struct ab8500_fg *di = platform_get_drvdata(pdev);
2380
2381         /*
2382          * Change state if we're not charging. If we're charging we will wake
2383          * up on the FG IRQ
2384          */
2385         if (!di->flags.charging) {
2386                 ab8500_fg_discharge_state_to(di, AB8500_FG_DISCHARGE_WAKEUP);
2387                 queue_work(di->fg_wq, &di->fg_work);
2388         }
2389
2390         return 0;
2391 }
2392
2393 static int ab8500_fg_suspend(struct platform_device *pdev,
2394         pm_message_t state)
2395 {
2396         struct ab8500_fg *di = platform_get_drvdata(pdev);
2397
2398         flush_delayed_work(&di->fg_periodic_work);
2399
2400         /*
2401          * If the FG is enabled we will disable it before going to suspend
2402          * only if we're not charging
2403          */
2404         if (di->flags.fg_enabled && !di->flags.charging)
2405                 ab8500_fg_coulomb_counter(di, false);
2406
2407         return 0;
2408 }
2409 #else
2410 #define ab8500_fg_suspend      NULL
2411 #define ab8500_fg_resume       NULL
2412 #endif
2413
2414 static int __devexit ab8500_fg_remove(struct platform_device *pdev)
2415 {
2416         int ret = 0;
2417         struct ab8500_fg *di = platform_get_drvdata(pdev);
2418
2419         list_del(&di->node);
2420
2421         /* Disable coulomb counter */
2422         ret = ab8500_fg_coulomb_counter(di, false);
2423         if (ret)
2424                 dev_err(di->dev, "failed to disable coulomb counter\n");
2425
2426         destroy_workqueue(di->fg_wq);
2427         ab8500_fg_sysfs_exit(di);
2428
2429         flush_scheduled_work();
2430         power_supply_unregister(&di->fg_psy);
2431         platform_set_drvdata(pdev, NULL);
2432         kfree(di);
2433         return ret;
2434 }
2435
2436 /* ab8500 fg driver interrupts and their respective isr */
2437 static struct ab8500_fg_interrupts ab8500_fg_irq[] = {
2438         {"NCONV_ACCU", ab8500_fg_cc_convend_handler},
2439         {"BATT_OVV", ab8500_fg_batt_ovv_handler},
2440         {"LOW_BAT_F", ab8500_fg_lowbatf_handler},
2441         {"CC_INT_CALIB", ab8500_fg_cc_int_calib_handler},
2442         {"CCEOC", ab8500_fg_cc_data_end_handler},
2443 };
2444
2445 static int __devinit ab8500_fg_probe(struct platform_device *pdev)
2446 {
2447         int i, irq;
2448         int ret = 0;
2449         struct abx500_bm_plat_data *plat_data = pdev->dev.platform_data;
2450         struct ab8500_fg *di;
2451
2452         if (!plat_data) {
2453                 dev_err(&pdev->dev, "No platform data\n");
2454                 return -EINVAL;
2455         }
2456
2457         di = kzalloc(sizeof(*di), GFP_KERNEL);
2458         if (!di)
2459                 return -ENOMEM;
2460
2461         mutex_init(&di->cc_lock);
2462
2463         /* get parent data */
2464         di->dev = &pdev->dev;
2465         di->parent = dev_get_drvdata(pdev->dev.parent);
2466         di->gpadc = ab8500_gpadc_get("ab8500-gpadc.0");
2467
2468         /* get fg specific platform data */
2469         di->pdata = plat_data->fg;
2470         if (!di->pdata) {
2471                 dev_err(di->dev, "no fg platform data supplied\n");
2472                 ret = -EINVAL;
2473                 goto free_device_info;
2474         }
2475
2476         /* get battery specific platform data */
2477         di->bat = plat_data->battery;
2478         if (!di->bat) {
2479                 dev_err(di->dev, "no battery platform data supplied\n");
2480                 ret = -EINVAL;
2481                 goto free_device_info;
2482         }
2483
2484         di->fg_psy.name = "ab8500_fg";
2485         di->fg_psy.type = POWER_SUPPLY_TYPE_BATTERY;
2486         di->fg_psy.properties = ab8500_fg_props;
2487         di->fg_psy.num_properties = ARRAY_SIZE(ab8500_fg_props);
2488         di->fg_psy.get_property = ab8500_fg_get_property;
2489         di->fg_psy.supplied_to = di->pdata->supplied_to;
2490         di->fg_psy.num_supplicants = di->pdata->num_supplicants;
2491         di->fg_psy.external_power_changed = ab8500_fg_external_power_changed;
2492
2493         di->bat_cap.max_mah_design = MILLI_TO_MICRO *
2494                 di->bat->bat_type[di->bat->batt_id].charge_full_design;
2495
2496         di->bat_cap.max_mah = di->bat_cap.max_mah_design;
2497
2498         di->vbat_nom = di->bat->bat_type[di->bat->batt_id].nominal_voltage;
2499
2500         di->init_capacity = true;
2501
2502         ab8500_fg_charge_state_to(di, AB8500_FG_CHARGE_INIT);
2503         ab8500_fg_discharge_state_to(di, AB8500_FG_DISCHARGE_INIT);
2504
2505         /* Create a work queue for running the FG algorithm */
2506         di->fg_wq = create_singlethread_workqueue("ab8500_fg_wq");
2507         if (di->fg_wq == NULL) {
2508                 dev_err(di->dev, "failed to create work queue\n");
2509                 goto free_device_info;
2510         }
2511
2512         /* Init work for running the fg algorithm instantly */
2513         INIT_WORK(&di->fg_work, ab8500_fg_instant_work);
2514
2515         /* Init work for getting the battery accumulated current */
2516         INIT_WORK(&di->fg_acc_cur_work, ab8500_fg_acc_cur_work);
2517
2518         /* Init work for reinitialising the fg algorithm */
2519         INIT_DELAYED_WORK_DEFERRABLE(&di->fg_reinit_work,
2520                 ab8500_fg_reinit_work);
2521
2522         /* Work delayed Queue to run the state machine */
2523         INIT_DELAYED_WORK_DEFERRABLE(&di->fg_periodic_work,
2524                 ab8500_fg_periodic_work);
2525
2526         /* Work to check low battery condition */
2527         INIT_DELAYED_WORK_DEFERRABLE(&di->fg_low_bat_work,
2528                 ab8500_fg_low_bat_work);
2529
2530         /* Init work for HW failure check */
2531         INIT_DELAYED_WORK_DEFERRABLE(&di->fg_check_hw_failure_work,
2532                 ab8500_fg_check_hw_failure_work);
2533
2534         /* Initialize OVV, and other registers */
2535         ret = ab8500_fg_init_hw_registers(di);
2536         if (ret) {
2537                 dev_err(di->dev, "failed to initialize registers\n");
2538                 goto free_inst_curr_wq;
2539         }
2540
2541         /* Consider battery unknown until we're informed otherwise */
2542         di->flags.batt_unknown = true;
2543         di->flags.batt_id_received = false;
2544
2545         /* Register FG power supply class */
2546         ret = power_supply_register(di->dev, &di->fg_psy);
2547         if (ret) {
2548                 dev_err(di->dev, "failed to register FG psy\n");
2549                 goto free_inst_curr_wq;
2550         }
2551
2552         di->fg_samples = SEC_TO_SAMPLE(di->bat->fg_params->init_timer);
2553         ab8500_fg_coulomb_counter(di, true);
2554
2555         /* Initialize completion used to notify completion of inst current */
2556         init_completion(&di->ab8500_fg_complete);
2557
2558         /* Register interrupts */
2559         for (i = 0; i < ARRAY_SIZE(ab8500_fg_irq); i++) {
2560                 irq = platform_get_irq_byname(pdev, ab8500_fg_irq[i].name);
2561                 ret = request_threaded_irq(irq, NULL, ab8500_fg_irq[i].isr,
2562                         IRQF_SHARED | IRQF_NO_SUSPEND,
2563                         ab8500_fg_irq[i].name, di);
2564
2565                 if (ret != 0) {
2566                         dev_err(di->dev, "failed to request %s IRQ %d: %d\n"
2567                                 , ab8500_fg_irq[i].name, irq, ret);
2568                         goto free_irq;
2569                 }
2570                 dev_dbg(di->dev, "Requested %s IRQ %d: %d\n",
2571                         ab8500_fg_irq[i].name, irq, ret);
2572         }
2573         di->irq = platform_get_irq_byname(pdev, "CCEOC");
2574         disable_irq(di->irq);
2575
2576         platform_set_drvdata(pdev, di);
2577
2578         ret = ab8500_fg_sysfs_init(di);
2579         if (ret) {
2580                 dev_err(di->dev, "failed to create sysfs entry\n");
2581                 goto free_irq;
2582         }
2583
2584         /* Calibrate the fg first time */
2585         di->flags.calibrate = true;
2586         di->calib_state = AB8500_FG_CALIB_INIT;
2587
2588         /* Use room temp as default value until we get an update from driver. */
2589         di->bat_temp = 210;
2590
2591         /* Run the FG algorithm */
2592         queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
2593
2594         list_add_tail(&di->node, &ab8500_fg_list);
2595
2596         return ret;
2597
2598 free_irq:
2599         power_supply_unregister(&di->fg_psy);
2600
2601         /* We also have to free all successfully registered irqs */
2602         for (i = i - 1; i >= 0; i--) {
2603                 irq = platform_get_irq_byname(pdev, ab8500_fg_irq[i].name);
2604                 free_irq(irq, di);
2605         }
2606 free_inst_curr_wq:
2607         destroy_workqueue(di->fg_wq);
2608 free_device_info:
2609         kfree(di);
2610
2611         return ret;
2612 }
2613
2614 static struct platform_driver ab8500_fg_driver = {
2615         .probe = ab8500_fg_probe,
2616         .remove = __devexit_p(ab8500_fg_remove),
2617         .suspend = ab8500_fg_suspend,
2618         .resume = ab8500_fg_resume,
2619         .driver = {
2620                 .name = "ab8500-fg",
2621                 .owner = THIS_MODULE,
2622         },
2623 };
2624
2625 static int __init ab8500_fg_init(void)
2626 {
2627         return platform_driver_register(&ab8500_fg_driver);
2628 }
2629
2630 static void __exit ab8500_fg_exit(void)
2631 {
2632         platform_driver_unregister(&ab8500_fg_driver);
2633 }
2634
2635 subsys_initcall_sync(ab8500_fg_init);
2636 module_exit(ab8500_fg_exit);
2637
2638 MODULE_LICENSE("GPL v2");
2639 MODULE_AUTHOR("Johan Palsson, Karl Komierowski");
2640 MODULE_ALIAS("platform:ab8500-fg");
2641 MODULE_DESCRIPTION("AB8500 Fuel Gauge driver");