drivers/power/da9052-battery.c

   1 /*
   2  * Batttery Driver for Dialog DA9052 PMICs
   3  *
   4  * Copyright(c) 2011 Dialog Semiconductor Ltd.
   5  *
   6  * Author: David Dajun Chen <dchen@diasemi.com>
   7  *
   8  * This program is free software; you can redistribute  it and/or modify it
   9  * under  the terms of  the GNU General  Public License as published by the
  10  * Free Software Foundation;  either version 2 of the  License, or (at your
  11  * option) any later version.
  12  */
  13
  14 #include <linux/delay.h>
  15 #include <linux/freezer.h>
  16 #include <linux/fs.h>
  17 #include <linux/jiffies.h>
  18 #include <linux/module.h>
  19 #include <linux/timer.h>
  20 #include <linux/uaccess.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/power_supply.h>
  23
  24 #include <linux/mfd/da9052/da9052.h>
  25 #include <linux/mfd/da9052/pdata.h>
  26 #include <linux/mfd/da9052/reg.h>
  27
  28 /* STATIC CONFIGURATION */
  29 #define DA9052_BAT_CUTOFF_VOLT          2800
  30 #define DA9052_BAT_TSH                  62000
  31 #define DA9052_BAT_LOW_CAP              4
  32 #define DA9052_AVG_SZ                   4
  33 #define DA9052_VC_TBL_SZ                68
  34 #define DA9052_VC_TBL_REF_SZ            3
  35
  36 #define DA9052_ISET_USB_MASK            0x0F
  37 #define DA9052_CHG_USB_ILIM_MASK        0x40
  38 #define DA9052_CHG_LIM_COLS             16
  39
  40 #define DA9052_MEAN(x, y)               ((x + y) / 2)
  41
  42 enum charger_type_enum {
  43         DA9052_NOCHARGER = 1,
  44         DA9052_CHARGER,
  45 };
  46
  47 static const u16 da9052_chg_current_lim[2][DA9052_CHG_LIM_COLS] = {
  48         {70,  80,  90,  100, 110, 120, 400,  450,
  49          500, 550, 600, 650, 700, 900, 1100, 1300},
  50         {80,  90,  100, 110,  120,  400,  450,  500,
  51          550, 600, 800, 1000, 1200, 1400, 1600, 1800},
  52 };
  53
  54 static const u16 vc_tbl_ref[3] = {10, 25, 40};
  55 /* Lookup table for voltage vs capacity */
  56 static u32 const vc_tbl[3][68][2] = {
  57         /* For temperature 10 degree Celsius */
  58         {
  59         {4082, 100}, {4036, 98},
  60         {4020, 96}, {4008, 95},
  61         {3997, 93}, {3983, 91},
  62         {3964, 90}, {3943, 88},
  63         {3926, 87}, {3912, 85},
  64         {3900, 84}, {3890, 82},
  65         {3881, 80}, {3873, 79},
  66         {3865, 77}, {3857, 76},
  67         {3848, 74}, {3839, 73},
  68         {3829, 71}, {3820, 70},
  69         {3811, 68}, {3802, 67},
  70         {3794, 65}, {3785, 64},
  71         {3778, 62}, {3770, 61},
  72         {3763, 59}, {3756, 58},
  73         {3750, 56}, {3744, 55},
  74         {3738, 53}, {3732, 52},
  75         {3727, 50}, {3722, 49},
  76         {3717, 47}, {3712, 46},
  77         {3708, 44}, {3703, 43},
  78         {3700, 41}, {3696, 40},
  79         {3693, 38}, {3691, 37},
  80         {3688, 35}, {3686, 34},
  81         {3683, 32}, {3681, 31},
  82         {3678, 29}, {3675, 28},
  83         {3672, 26}, {3669, 25},
  84         {3665, 23}, {3661, 22},
  85         {3656, 21}, {3651, 19},
  86         {3645, 18}, {3639, 16},
  87         {3631, 15}, {3622, 13},
  88         {3611, 12}, {3600, 10},
  89         {3587, 9}, {3572, 7},
  90         {3548, 6}, {3503, 5},
  91         {3420, 3}, {3268, 2},
  92         {2992, 1}, {2746, 0}
  93         },
  94         /* For temperature 25 degree Celsius */
  95         {
  96         {4102, 100}, {4065, 98},
  97         {4048, 96}, {4034, 95},
  98         {4021, 93}, {4011, 92},
  99         {4001, 90}, {3986, 88},
 100         {3968, 87}, {3952, 85},
 101         {3938, 84}, {3926, 82},
 102         {3916, 81}, {3908, 79},
 103         {3900, 77}, {3892, 76},
 104         {3883, 74}, {3874, 73},
 105         {3864, 71}, {3855, 70},
 106         {3846, 68}, {3836, 67},
 107         {3827, 65}, {3819, 64},
 108         {3810, 62}, {3801, 61},
 109         {3793, 59}, {3786, 58},
 110         {3778, 56}, {3772, 55},
 111         {3765, 53}, {3759, 52},
 112         {3754, 50}, {3748, 49},
 113         {3743, 47}, {3738, 46},
 114         {3733, 44}, {3728, 43},
 115         {3724, 41}, {3720, 40},
 116         {3716, 38}, {3712, 37},
 117         {3709, 35}, {3706, 34},
 118         {3703, 33}, {3701, 31},
 119         {3698, 30}, {3696, 28},
 120         {3693, 27}, {3690, 25},
 121         {3687, 24}, {3683, 22},
 122         {3680, 21}, {3675, 19},
 123         {3671, 18}, {3666, 17},
 124         {3660, 15}, {3654, 14},
 125         {3647, 12}, {3639, 11},
 126         {3630, 9}, {3621, 8},
 127         {3613, 6}, {3606, 5},
 128         {3597, 4}, {3582, 2},
 129         {3546, 1}, {2747, 0}
 130         },
 131         /* For temperature 40 degree Celsius */
 132         {
 133         {4114, 100}, {4081, 98},
 134         {4065, 96}, {4050, 95},
 135         {4036, 93}, {4024, 92},
 136         {4013, 90}, {4002, 88},
 137         {3990, 87}, {3976, 85},
 138         {3962, 84}, {3950, 82},
 139         {3939, 81}, {3930, 79},
 140         {3921, 77}, {3912, 76},
 141         {3902, 74}, {3893, 73},
 142         {3883, 71}, {3874, 70},
 143         {3865, 68}, {3856, 67},
 144         {3847, 65}, {3838, 64},
 145         {3829, 62}, {3820, 61},
 146         {3812, 59}, {3803, 58},
 147         {3795, 56}, {3787, 55},
 148         {3780, 53}, {3773, 52},
 149         {3767, 50}, {3761, 49},
 150         {3756, 47}, {3751, 46},
 151         {3746, 44}, {3741, 43},
 152         {3736, 41}, {3732, 40},
 153         {3728, 38}, {3724, 37},
 154         {3720, 35}, {3716, 34},
 155         {3713, 33}, {3710, 31},
 156         {3707, 30}, {3704, 28},
 157         {3701, 27}, {3698, 25},
 158         {3695, 24}, {3691, 22},
 159         {3686, 21}, {3681, 19},
 160         {3676, 18}, {3671, 17},
 161         {3666, 15}, {3661, 14},
 162         {3655, 12}, {3648, 11},
 163         {3640, 9}, {3632, 8},
 164         {3622, 6}, {3616, 5},
 165         {3611, 4}, {3604, 2},
 166         {3594, 1}, {2747, 0}
 167         }
 168 };
 169
 170 struct da9052_battery {
 171         struct da9052 *da9052;
 172         struct power_supply psy;
 173         struct notifier_block nb;
 174         int charger_type;
 175         int status;
 176         int health;
 177 };
 178
 179 static inline int volt_reg_to_mV(int value)
 180 {
 181         return ((value * 1000) / 512) + 2500;
 182 }
 183
 184 static inline int ichg_reg_to_mA(int value)
 185 {
 186         return (value * 3900) / 1000;
 187 }
 188
 189 static int da9052_read_chgend_current(struct da9052_battery *bat,
 190                                        int *current_mA)
 191 {
 192         int ret;
 193
 194         if (bat->status == POWER_SUPPLY_STATUS_DISCHARGING)
 195                 return -EINVAL;
 196
 197         ret = da9052_reg_read(bat->da9052, DA9052_ICHG_END_REG);
 198         if (ret < 0)
 199                 return ret;
 200
 201         *current_mA = ichg_reg_to_mA(ret & DA9052_ICHGEND_ICHGEND);
 202
 203         return 0;
 204 }
 205
 206 static int da9052_read_chg_current(struct da9052_battery *bat, int *current_mA)
 207 {
 208         int ret;
 209
 210         if (bat->status == POWER_SUPPLY_STATUS_DISCHARGING)
 211                 return -EINVAL;
 212
 213         ret = da9052_reg_read(bat->da9052, DA9052_ICHG_AV_REG);
 214         if (ret < 0)
 215                 return ret;
 216
 217         *current_mA = ichg_reg_to_mA(ret & DA9052_ICHGAV_ICHGAV);
 218
 219         return 0;
 220 }
 221
 222 static int da9052_bat_check_status(struct da9052_battery *bat, int *status)
 223 {
 224         u8 v[2] = {0, 0};
 225         u8 bat_status;
 226         u8 chg_end;
 227         int ret;
 228         int chg_current;
 229         int chg_end_current;
 230         bool dcinsel;
 231         bool dcindet;
 232         bool vbussel;
 233         bool vbusdet;
 234         bool dc;
 235         bool vbus;
 236
 237         ret = da9052_group_read(bat->da9052, DA9052_STATUS_A_REG, 2, v);
 238         if (ret < 0)
 239                 return ret;
 240
 241         bat_status = v[0];
 242         chg_end = v[1];
 243
 244         dcinsel = bat_status & DA9052_STATUSA_DCINSEL;
 245         dcindet = bat_status & DA9052_STATUSA_DCINDET;
 246         vbussel = bat_status & DA9052_STATUSA_VBUSSEL;
 247         vbusdet = bat_status & DA9052_STATUSA_VBUSDET;
 248         dc = dcinsel && dcindet;
 249         vbus = vbussel && vbusdet;
 250
 251         /* Preference to WALL(DCIN) charger unit */
 252         if (dc || vbus) {
 253                 bat->charger_type = DA9052_CHARGER;
 254
 255                 /* If charging end flag is set and Charging current is greater
 256                  * than charging end limit then battery is charging
 257                 */
 258                 if ((chg_end & DA9052_STATUSB_CHGEND) != 0) {
 259                         ret = da9052_read_chg_current(bat, &chg_current);
 260                         if (ret < 0)
 261                                 return ret;
 262                         ret = da9052_read_chgend_current(bat, &chg_end_current);
 263                         if (ret < 0)
 264                                 return ret;
 265
 266                         if (chg_current >= chg_end_current)
 267                                 bat->status = POWER_SUPPLY_STATUS_CHARGING;
 268                         else
 269                                 bat->status = POWER_SUPPLY_STATUS_NOT_CHARGING;
 270                 } else {
 271                         /* If Charging end flag is cleared then battery is
 272                          * charging
 273                         */
 274                         bat->status = POWER_SUPPLY_STATUS_CHARGING;
 275                 }
 276         } else if (dcindet || vbusdet) {
 277                         bat->charger_type = DA9052_CHARGER;
 278                         bat->status = POWER_SUPPLY_STATUS_NOT_CHARGING;
 279         } else {
 280                 bat->charger_type = DA9052_NOCHARGER;
 281                 bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
 282         }
 283
 284         if (status != NULL)
 285                 *status = bat->status;
 286         return 0;
 287 }
 288
 289 static int da9052_bat_read_volt(struct da9052_battery *bat, int *volt_mV)
 290 {
 291         int volt;
 292
 293         volt = da9052_adc_manual_read(bat->da9052, DA9052_ADC_MAN_MUXSEL_VBAT);
 294         if (volt < 0)
 295                 return volt;
 296
 297         *volt_mV = volt_reg_to_mV(volt);
 298
 299         return 0;
 300 }
 301
 302 static int da9052_bat_check_presence(struct da9052_battery *bat, int *illegal)
 303 {
 304         int bat_temp;
 305
 306         bat_temp = da9052_adc_read_temp(bat->da9052);
 307         if (bat_temp < 0)
 308                 return bat_temp;
 309
 310         if (bat_temp > DA9052_BAT_TSH)
 311                 *illegal = 1;
 312         else
 313                 *illegal = 0;
 314
 315         return 0;
 316 }
 317
 318 static int da9052_bat_interpolate(int vbat_lower, int  vbat_upper,
 319                                    int level_lower, int level_upper,
 320                                    int bat_voltage)
 321 {
 322         int tmp;
 323
 324         tmp = ((level_upper - level_lower) * 1000) / (vbat_upper - vbat_lower);
 325         tmp = level_lower + (((bat_voltage - vbat_lower) * tmp) / 1000);
 326
 327         return tmp;
 328 }
 329
 330 static unsigned char da9052_determine_vc_tbl_index(unsigned char adc_temp)
 331 {
 332         int i;
 333
 334         if (adc_temp <= vc_tbl_ref[0])
 335                 return 0;
 336
 337         if (adc_temp > vc_tbl_ref[DA9052_VC_TBL_REF_SZ - 1])
 338                 return DA9052_VC_TBL_REF_SZ - 1;
 339
 340         for (i = 0; i < DA9052_VC_TBL_REF_SZ - 1; i++) {
 341                 if ((adc_temp > vc_tbl_ref[i]) &&
 342                     (adc_temp <= DA9052_MEAN(vc_tbl_ref[i], vc_tbl_ref[i + 1])))
 343                                 return i;
 344                 if ((adc_temp > DA9052_MEAN(vc_tbl_ref[i], vc_tbl_ref[i + 1]))
 345                      && (adc_temp <= vc_tbl_ref[i]))
 346                                 return i + 1;
 347         }
 348         /*
 349          * For some reason authors of the driver didn't presume that we can
 350          * end up here. It might be OK, but might be not, no one knows for
 351          * sure. Go check your battery, is it on fire?
 352          */
 353         WARN_ON(1);
 354         return 0;
 355 }
 356
 357 static int da9052_bat_read_capacity(struct da9052_battery *bat, int *capacity)
 358 {
 359         int adc_temp;
 360         int bat_voltage;
 361         int vbat_lower;
 362         int vbat_upper;
 363         int level_upper;
 364         int level_lower;
 365         int ret;
 366         int flag;
 367         int i = 0;
 368         int j;
 369
 370         ret = da9052_bat_read_volt(bat, &bat_voltage);
 371         if (ret < 0)
 372                 return ret;
 373
 374         adc_temp = da9052_adc_read_temp(bat->da9052);
 375         if (adc_temp < 0)
 376                 return adc_temp;
 377
 378         i = da9052_determine_vc_tbl_index(adc_temp);
 379
 380         if (bat_voltage >= vc_tbl[i][0][0]) {
 381                 *capacity = 100;
 382                 return 0;
 383         }
 384         if (bat_voltage <= vc_tbl[i][DA9052_VC_TBL_SZ - 1][0]) {
 385                 *capacity = 0;
 386                 return 0;
 387         }
 388         flag = 0;
 389
 390         for (j = 0; j < (DA9052_VC_TBL_SZ-1); j++) {
 391                 if ((bat_voltage <= vc_tbl[i][j][0]) &&
 392                     (bat_voltage >= vc_tbl[i][j + 1][0])) {
 393                         vbat_upper = vc_tbl[i][j][0];
 394                         vbat_lower = vc_tbl[i][j + 1][0];
 395                         level_upper = vc_tbl[i][j][1];
 396                         level_lower = vc_tbl[i][j + 1][1];
 397                         flag = 1;
 398                         break;
 399                 }
 400         }
 401         if (!flag)
 402                 return -EIO;
 403
 404         *capacity = da9052_bat_interpolate(vbat_lower, vbat_upper, level_lower,
 405                                            level_upper, bat_voltage);
 406
 407         return 0;
 408 }
 409
 410 static int da9052_bat_check_health(struct da9052_battery *bat, int *health)
 411 {
 412         int ret;
 413         int bat_illegal;
 414         int capacity;
 415
 416         ret = da9052_bat_check_presence(bat, &bat_illegal);
 417         if (ret < 0)
 418                 return ret;
 419
 420         if (bat_illegal) {
 421                 bat->health = POWER_SUPPLY_HEALTH_UNKNOWN;
 422                 return 0;
 423         }
 424
 425         if (bat->health != POWER_SUPPLY_HEALTH_OVERHEAT) {
 426                 ret = da9052_bat_read_capacity(bat, &capacity);
 427                 if (ret < 0)
 428                         return ret;
 429                 if (capacity < DA9052_BAT_LOW_CAP)
 430                         bat->health = POWER_SUPPLY_HEALTH_DEAD;
 431                 else
 432                         bat->health = POWER_SUPPLY_HEALTH_GOOD;
 433         }
 434
 435         *health = bat->health;
 436
 437         return 0;
 438 }
 439
 440 static irqreturn_t da9052_bat_irq(int irq, void *data)
 441 {
 442         struct da9052_battery *bat = data;
 443         int virq;
 444
 445         virq = regmap_irq_get_virq(bat->da9052->irq_data, irq);
 446         irq -= virq;
 447
 448         if (irq == DA9052_IRQ_CHGEND)
 449                 bat->status = POWER_SUPPLY_STATUS_FULL;
 450         else
 451                 da9052_bat_check_status(bat, NULL);
 452
 453         if (irq == DA9052_IRQ_CHGEND || irq == DA9052_IRQ_DCIN ||
 454             irq == DA9052_IRQ_VBUS || irq == DA9052_IRQ_TBAT) {
 455                 power_supply_changed(&bat->psy);
 456         }
 457
 458         return IRQ_HANDLED;
 459 }
 460
 461 static int da9052_USB_current_notifier(struct notifier_block *nb,
 462                                         unsigned long events, void *data)
 463 {
 464         u8 row;
 465         u8 col;
 466         int *current_mA = data;
 467         int ret;
 468         struct da9052_battery *bat = container_of(nb, struct da9052_battery,
 469                                                   nb);
 470
 471         if (bat->status == POWER_SUPPLY_STATUS_DISCHARGING)
 472                 return -EPERM;
 473
 474         ret = da9052_reg_read(bat->da9052, DA9052_CHGBUCK_REG);
 475         if (ret & DA9052_CHG_USB_ILIM_MASK)
 476                 return -EPERM;
 477
 478         if (bat->da9052->chip_id == DA9052)
 479                 row = 0;
 480         else
 481                 row = 1;
 482
 483         if (*current_mA < da9052_chg_current_lim[row][0] ||
 484             *current_mA > da9052_chg_current_lim[row][DA9052_CHG_LIM_COLS - 1])
 485                 return -EINVAL;
 486
 487         for (col = 0; col <= DA9052_CHG_LIM_COLS - 1 ; col++) {
 488                 if (*current_mA <= da9052_chg_current_lim[row][col])
 489                         break;
 490         }
 491
 492         return da9052_reg_update(bat->da9052, DA9052_ISET_REG,
 493                                  DA9052_ISET_USB_MASK, col);
 494 }
 495
 496 static int da9052_bat_get_property(struct power_supply *psy,
 497                                     enum power_supply_property psp,
 498                                     union power_supply_propval *val)
 499 {
 500         int ret;
 501         int illegal;
 502         struct da9052_battery *bat = container_of(psy, struct da9052_battery,
 503                                                   psy);
 504
 505         ret = da9052_bat_check_presence(bat, &illegal);
 506         if (ret < 0)
 507                 return ret;
 508
 509         if (illegal && psp != POWER_SUPPLY_PROP_PRESENT)
 510                 return -ENODEV;
 511
 512         switch (psp) {
 513         case POWER_SUPPLY_PROP_STATUS:
 514                 ret = da9052_bat_check_status(bat, &val->intval);
 515                 break;
 516         case POWER_SUPPLY_PROP_ONLINE:
 517                 val->intval =
 518                         (bat->charger_type == DA9052_NOCHARGER) ? 0 : 1;
 519                 break;
 520         case POWER_SUPPLY_PROP_PRESENT:
 521                 ret = da9052_bat_check_presence(bat, &val->intval);
 522                 break;
 523         case POWER_SUPPLY_PROP_HEALTH:
 524                 ret = da9052_bat_check_health(bat, &val->intval);
 525                 break;
 526         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 527                 val->intval = DA9052_BAT_CUTOFF_VOLT * 1000;
 528                 break;
 529         case POWER_SUPPLY_PROP_VOLTAGE_AVG:
 530                 ret = da9052_bat_read_volt(bat, &val->intval);
 531                 break;
 532         case POWER_SUPPLY_PROP_CURRENT_AVG:
 533                 ret = da9052_read_chg_current(bat, &val->intval);
 534                 break;
 535         case POWER_SUPPLY_PROP_CAPACITY:
 536                 ret = da9052_bat_read_capacity(bat, &val->intval);
 537                 break;
 538         case POWER_SUPPLY_PROP_TEMP:
 539                 val->intval = da9052_adc_read_temp(bat->da9052);
 540                 ret = val->intval;
 541                 break;
 542         case POWER_SUPPLY_PROP_TECHNOLOGY:
 543                 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
 544                 break;
 545         default:
 546                 return -EINVAL;
 547         }
 548         return ret;
 549 }
 550
 551 static enum power_supply_property da9052_bat_props[] = {
 552         POWER_SUPPLY_PROP_STATUS,
 553         POWER_SUPPLY_PROP_ONLINE,
 554         POWER_SUPPLY_PROP_PRESENT,
 555         POWER_SUPPLY_PROP_HEALTH,
 556         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 557         POWER_SUPPLY_PROP_VOLTAGE_AVG,
 558         POWER_SUPPLY_PROP_CURRENT_AVG,
 559         POWER_SUPPLY_PROP_CAPACITY,
 560         POWER_SUPPLY_PROP_TEMP,
 561         POWER_SUPPLY_PROP_TECHNOLOGY,
 562 };
 563
 564 static struct power_supply template_battery = {
 565         .name           = "da9052-bat",
 566         .type           = POWER_SUPPLY_TYPE_BATTERY,
 567         .properties     = da9052_bat_props,
 568         .num_properties = ARRAY_SIZE(da9052_bat_props),
 569         .get_property   = da9052_bat_get_property,
 570 };
 571
 572 static char *da9052_bat_irqs[] = {
 573         "BATT TEMP",
 574         "DCIN DET",
 575         "DCIN REM",
 576         "VBUS DET",
 577         "VBUS REM",
 578         "CHG END",
 579 };
 580
 581 static int da9052_bat_irq_bits[] = {
 582         DA9052_IRQ_TBAT,
 583         DA9052_IRQ_DCIN,
 584         DA9052_IRQ_DCINREM,
 585         DA9052_IRQ_VBUS,
 586         DA9052_IRQ_VBUSREM,
 587         DA9052_IRQ_CHGEND,
 588 };
 589
 590 static s32 da9052_bat_probe(struct platform_device *pdev)
 591 {
 592         struct da9052_pdata *pdata;
 593         struct da9052_battery *bat;
 594         int ret;
 595         int i;
 596
 597         bat = devm_kzalloc(&pdev->dev, sizeof(struct da9052_battery),
 598                                 GFP_KERNEL);
 599         if (!bat)
 600                 return -ENOMEM;
 601
 602         bat->da9052 = dev_get_drvdata(pdev->dev.parent);
 603         bat->psy = template_battery;
 604         bat->charger_type = DA9052_NOCHARGER;
 605         bat->status = POWER_SUPPLY_STATUS_UNKNOWN;
 606         bat->health = POWER_SUPPLY_HEALTH_UNKNOWN;
 607         bat->nb.notifier_call = da9052_USB_current_notifier;
 608
 609         pdata = bat->da9052->dev->platform_data;
 610         if (pdata != NULL && pdata->use_for_apm)
 611                 bat->psy.use_for_apm = pdata->use_for_apm;
 612         else
 613                 bat->psy.use_for_apm = 1;
 614
 615         for (i = 0; i < ARRAY_SIZE(da9052_bat_irqs); i++) {
 616                 ret = da9052_request_irq(bat->da9052,
 617                                 da9052_bat_irq_bits[i], da9052_bat_irqs[i],
 618                                 da9052_bat_irq, bat);
 619
 620                 if (ret != 0) {
 621                         dev_err(bat->da9052->dev,
 622                                 "DA9052 failed to request %s IRQ: %d\n",
 623                                 da9052_bat_irqs[i], ret);
 624                         goto err;
 625                 }
 626         }
 627
 628         ret = power_supply_register(&pdev->dev, &bat->psy);
 629          if (ret)
 630                 goto err;
 631
 632         platform_set_drvdata(pdev, bat);
 633         return 0;
 634
 635 err:
 636         while (--i >= 0)
 637                 da9052_free_irq(bat->da9052, da9052_bat_irq_bits[i], bat);
 638
 639         return ret;
 640 }
 641 static int da9052_bat_remove(struct platform_device *pdev)
 642 {
 643         int i;
 644         struct da9052_battery *bat = platform_get_drvdata(pdev);
 645
 646         for (i = 0; i < ARRAY_SIZE(da9052_bat_irqs); i++)
 647                 da9052_free_irq(bat->da9052, da9052_bat_irq_bits[i], bat);
 648
 649         power_supply_unregister(&bat->psy);
 650
 651         return 0;
 652 }
 653
 654 static struct platform_driver da9052_bat_driver = {
 655         .probe = da9052_bat_probe,
 656         .remove = da9052_bat_remove,
 657         .driver = {
 658                 .name = "da9052-bat",
 659                 .owner = THIS_MODULE,
 660         },
 661 };
 662 module_platform_driver(da9052_bat_driver);
 663
 664 MODULE_DESCRIPTION("DA9052 BAT Device Driver");
 665 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
 666 MODULE_LICENSE("GPL");
 667 MODULE_ALIAS("platform:da9052-bat");