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; 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
 444         irq -= bat->da9052->irq_base;
 445
 446         if (irq == DA9052_IRQ_CHGEND)
 447                 bat->status = POWER_SUPPLY_STATUS_FULL;
 448         else
 449                 da9052_bat_check_status(bat, NULL);
 450
 451         if (irq == DA9052_IRQ_CHGEND || irq == DA9052_IRQ_DCIN ||
 452             irq == DA9052_IRQ_VBUS || irq == DA9052_IRQ_TBAT) {
 453                 power_supply_changed(&bat->psy);
 454         }
 455
 456         return IRQ_HANDLED;
 457 }
 458
 459 static int da9052_USB_current_notifier(struct notifier_block *nb,
 460                                         unsigned long events, void *data)
 461 {
 462         u8 row;
 463         u8 col;
 464         int *current_mA = data;
 465         int ret;
 466         struct da9052_battery *bat = container_of(nb, struct da9052_battery,
 467                                                   nb);
 468
 469         if (bat->status == POWER_SUPPLY_STATUS_DISCHARGING)
 470                 return -EPERM;
 471
 472         ret = da9052_reg_read(bat->da9052, DA9052_CHGBUCK_REG);
 473         if (ret & DA9052_CHG_USB_ILIM_MASK)
 474                 return -EPERM;
 475
 476         if (bat->da9052->chip_id == DA9052)
 477                 row = 0;
 478         else
 479                 row = 1;
 480
 481         if (*current_mA < da9052_chg_current_lim[row][0] ||
 482             *current_mA > da9052_chg_current_lim[row][DA9052_CHG_LIM_COLS - 1])
 483                 return -EINVAL;
 484
 485         for (col = 0; col <= DA9052_CHG_LIM_COLS - 1 ; col++) {
 486                 if (*current_mA <= da9052_chg_current_lim[row][col])
 487                         break;
 488         }
 489
 490         return da9052_reg_update(bat->da9052, DA9052_ISET_REG,
 491                                  DA9052_ISET_USB_MASK, col);
 492 }
 493
 494 static int da9052_bat_get_property(struct power_supply *psy,
 495                                     enum power_supply_property psp,
 496                                     union power_supply_propval *val)
 497 {
 498         int ret;
 499         int illegal;
 500         struct da9052_battery *bat = container_of(psy, struct da9052_battery,
 501                                                   psy);
 502
 503         ret = da9052_bat_check_presence(bat, &illegal);
 504         if (ret < 0)
 505                 return ret;
 506
 507         if (illegal && psp != POWER_SUPPLY_PROP_PRESENT)
 508                 return -ENODEV;
 509
 510         switch (psp) {
 511         case POWER_SUPPLY_PROP_STATUS:
 512                 ret = da9052_bat_check_status(bat, &val->intval);
 513                 break;
 514         case POWER_SUPPLY_PROP_ONLINE:
 515                 val->intval =
 516                         (bat->charger_type == DA9052_NOCHARGER) ? 0 : 1;
 517                 break;
 518         case POWER_SUPPLY_PROP_PRESENT:
 519                 ret = da9052_bat_check_presence(bat, &val->intval);
 520                 break;
 521         case POWER_SUPPLY_PROP_HEALTH:
 522                 ret = da9052_bat_check_health(bat, &val->intval);
 523                 break;
 524         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 525                 val->intval = DA9052_BAT_CUTOFF_VOLT * 1000;
 526                 break;
 527         case POWER_SUPPLY_PROP_VOLTAGE_AVG:
 528                 ret = da9052_bat_read_volt(bat, &val->intval);
 529                 break;
 530         case POWER_SUPPLY_PROP_CURRENT_AVG:
 531                 ret = da9052_read_chg_current(bat, &val->intval);
 532                 break;
 533         case POWER_SUPPLY_PROP_CAPACITY:
 534                 ret = da9052_bat_read_capacity(bat, &val->intval);
 535                 break;
 536         case POWER_SUPPLY_PROP_TEMP:
 537                 val->intval = da9052_adc_read_temp(bat->da9052);
 538                 ret = val->intval;
 539                 break;
 540         case POWER_SUPPLY_PROP_TECHNOLOGY:
 541                 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
 542                 break;
 543         default:
 544                 return -EINVAL;
 545         }
 546         return ret;
 547 }
 548
 549 static enum power_supply_property da9052_bat_props[] = {
 550         POWER_SUPPLY_PROP_STATUS,
 551         POWER_SUPPLY_PROP_ONLINE,
 552         POWER_SUPPLY_PROP_PRESENT,
 553         POWER_SUPPLY_PROP_HEALTH,
 554         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 555         POWER_SUPPLY_PROP_VOLTAGE_AVG,
 556         POWER_SUPPLY_PROP_CURRENT_AVG,
 557         POWER_SUPPLY_PROP_CAPACITY,
 558         POWER_SUPPLY_PROP_TEMP,
 559         POWER_SUPPLY_PROP_TECHNOLOGY,
 560 };
 561
 562 static struct power_supply template_battery = {
 563         .name           = "da9052-bat",
 564         .type           = POWER_SUPPLY_TYPE_BATTERY,
 565         .properties     = da9052_bat_props,
 566         .num_properties = ARRAY_SIZE(da9052_bat_props),
 567         .get_property   = da9052_bat_get_property,
 568 };
 569
 570 static const char *const da9052_bat_irqs[] = {
 571         "BATT TEMP",
 572         "DCIN DET",
 573         "DCIN REM",
 574         "VBUS DET",
 575         "VBUS REM",
 576         "CHG END",
 577 };
 578
 579 static s32 __devinit da9052_bat_probe(struct platform_device *pdev)
 580 {
 581         struct da9052_pdata *pdata;
 582         struct da9052_battery *bat;
 583         int ret;
 584         int irq;
 585         int i;
 586
 587         bat = kzalloc(sizeof(struct da9052_battery), GFP_KERNEL);
 588         if (!bat)
 589                 return -ENOMEM;
 590
 591         bat->da9052 = dev_get_drvdata(pdev->dev.parent);
 592         bat->psy = template_battery;
 593         bat->charger_type = DA9052_NOCHARGER;
 594         bat->status = POWER_SUPPLY_STATUS_UNKNOWN;
 595         bat->health = POWER_SUPPLY_HEALTH_UNKNOWN;
 596         bat->nb.notifier_call = da9052_USB_current_notifier;
 597
 598         pdata = bat->da9052->dev->platform_data;
 599         if (pdata != NULL && pdata->use_for_apm)
 600                 bat->psy.use_for_apm = pdata->use_for_apm;
 601         else
 602                 bat->psy.use_for_apm = 1;
 603
 604         for (i = 0; i < ARRAY_SIZE(da9052_bat_irqs); i++) {
 605                 irq = platform_get_irq_byname(pdev, da9052_bat_irqs[i]);
 606                 ret = request_threaded_irq(bat->da9052->irq_base + irq,
 607                                            NULL, da9052_bat_irq,
 608                                            IRQF_TRIGGER_LOW | IRQF_ONESHOT,
 609                                            da9052_bat_irqs[i], bat);
 610                 if (ret != 0) {
 611                         dev_err(bat->da9052->dev,
 612                                 "DA9052 failed to request %s IRQ %d: %d\n",
 613                                 da9052_bat_irqs[i], irq, ret);
 614                         goto err;
 615                 }
 616         }
 617
 618         ret = power_supply_register(&pdev->dev, &bat->psy);
 619          if (ret)
 620                 goto err;
 621
 622         platform_set_drvdata(pdev, bat);
 623         return 0;
 624
 625 err:
 626         while (--i >= 0) {
 627                 irq = platform_get_irq_byname(pdev, da9052_bat_irqs[i]);
 628                 free_irq(bat->da9052->irq_base + irq, bat);
 629         }
 630         kfree(bat);
 631         return ret;
 632 }
 633 static int __devexit da9052_bat_remove(struct platform_device *pdev)
 634 {
 635         int i;
 636         int irq;
 637         struct da9052_battery *bat = platform_get_drvdata(pdev);
 638
 639         for (i = 0; i < ARRAY_SIZE(da9052_bat_irqs); i++) {
 640                 irq = platform_get_irq_byname(pdev, da9052_bat_irqs[i]);
 641                 free_irq(bat->da9052->irq_base + irq, bat);
 642         }
 643         power_supply_unregister(&bat->psy);
 644         kfree(bat);
 645
 646         return 0;
 647 }
 648
 649 static struct platform_driver da9052_bat_driver = {
 650         .probe = da9052_bat_probe,
 651         .remove = __devexit_p(da9052_bat_remove),
 652         .driver = {
 653                 .name = "da9052-bat",
 654                 .owner = THIS_MODULE,
 655         },
 656 };
 657 module_platform_driver(da9052_bat_driver);
 658
 659 MODULE_DESCRIPTION("DA9052 BAT Device Driver");
 660 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
 661 MODULE_LICENSE("GPL");
 662 MODULE_ALIAS("platform:da9052-bat");