linux/drivers/power/da9052-battery.c
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   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
  42enum charger_type_enum {
  43        DA9052_NOCHARGER = 1,
  44        DA9052_CHARGER,
  45};
  46
  47static 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
  54static const u16 vc_tbl_ref[3] = {10, 25, 40};
  55/* Lookup table for voltage vs capacity */
  56static 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
 170struct 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
 179static inline int volt_reg_to_mV(int value)
 180{
 181        return ((value * 1000) / 512) + 2500;
 182}
 183
 184static inline int ichg_reg_to_mA(int value)
 185{
 186        return (value * 3900) / 1000;
 187}
 188
 189static 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
 206static 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
 222static 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
 289static 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
 302static 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
 318static 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
 330unsigned 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
 350static int da9052_bat_read_capacity(struct da9052_battery *bat, int *capacity)
 351{
 352        int adc_temp;
 353        int bat_voltage;
 354        int vbat_lower;
 355        int vbat_upper;
 356        int level_upper;
 357        int level_lower;
 358        int ret;
 359        int flag;
 360        int i = 0;
 361        int j;
 362
 363        ret = da9052_bat_read_volt(bat, &bat_voltage);
 364        if (ret < 0)
 365                return ret;
 366
 367        adc_temp = da9052_adc_read_temp(bat->da9052);
 368        if (adc_temp < 0)
 369                return adc_temp;
 370
 371        i = da9052_determine_vc_tbl_index(adc_temp);
 372
 373        if (bat_voltage >= vc_tbl[i][0][0]) {
 374                *capacity = 100;
 375                return 0;
 376        }
 377        if (bat_voltage <= vc_tbl[i][DA9052_VC_TBL_SZ - 1][0]) {
 378                *capacity = 0;
 379                return 0;
 380        }
 381        flag = 0;
 382
 383        for (j = 0; j < (DA9052_VC_TBL_SZ-1); j++) {
 384                if ((bat_voltage <= vc_tbl[i][j][0]) &&
 385                    (bat_voltage >= vc_tbl[i][j + 1][0])) {
 386                        vbat_upper = vc_tbl[i][j][0];
 387                        vbat_lower = vc_tbl[i][j + 1][0];
 388                        level_upper = vc_tbl[i][j][1];
 389                        level_lower = vc_tbl[i][j + 1][1];
 390                        flag = 1;
 391                        break;
 392                }
 393        }
 394        if (!flag)
 395                return -EIO;
 396
 397        *capacity = da9052_bat_interpolate(vbat_lower, vbat_upper, level_lower,
 398                                           level_upper, bat_voltage);
 399
 400        return 0;
 401}
 402
 403static int da9052_bat_check_health(struct da9052_battery *bat, int *health)
 404{
 405        int ret;
 406        int bat_illegal;
 407        int capacity;
 408
 409        ret = da9052_bat_check_presence(bat, &bat_illegal);
 410        if (ret < 0)
 411                return ret;
 412
 413        if (bat_illegal) {
 414                bat->health = POWER_SUPPLY_HEALTH_UNKNOWN;
 415                return 0;
 416        }
 417
 418        if (bat->health != POWER_SUPPLY_HEALTH_OVERHEAT) {
 419                ret = da9052_bat_read_capacity(bat, &capacity);
 420                if (ret < 0)
 421                        return ret;
 422                if (capacity < DA9052_BAT_LOW_CAP)
 423                        bat->health = POWER_SUPPLY_HEALTH_DEAD;
 424                else
 425                        bat->health = POWER_SUPPLY_HEALTH_GOOD;
 426        }
 427
 428        *health = bat->health;
 429
 430        return 0;
 431}
 432
 433static irqreturn_t da9052_bat_irq(int irq, void *data)
 434{
 435        struct da9052_battery *bat = data;
 436
 437        irq -= bat->da9052->irq_base;
 438
 439        if (irq == DA9052_IRQ_CHGEND)
 440                bat->status = POWER_SUPPLY_STATUS_FULL;
 441        else
 442                da9052_bat_check_status(bat, NULL);
 443
 444        if (irq == DA9052_IRQ_CHGEND || irq == DA9052_IRQ_DCIN ||
 445            irq == DA9052_IRQ_VBUS || irq == DA9052_IRQ_TBAT) {
 446                power_supply_changed(&bat->psy);
 447        }
 448
 449        return IRQ_HANDLED;
 450}
 451
 452static int da9052_USB_current_notifier(struct notifier_block *nb,
 453                                        unsigned long events, void *data)
 454{
 455        u8 row;
 456        u8 col;
 457        int *current_mA = data;
 458        int ret;
 459        struct da9052_battery *bat = container_of(nb, struct da9052_battery,
 460                                                  nb);
 461
 462        if (bat->status == POWER_SUPPLY_STATUS_DISCHARGING)
 463                return -EPERM;
 464
 465        ret = da9052_reg_read(bat->da9052, DA9052_CHGBUCK_REG);
 466        if (ret & DA9052_CHG_USB_ILIM_MASK)
 467                return -EPERM;
 468
 469        if (bat->da9052->chip_id == DA9052)
 470                row = 0;
 471        else
 472                row = 1;
 473
 474        if (*current_mA < da9052_chg_current_lim[row][0] ||
 475            *current_mA > da9052_chg_current_lim[row][DA9052_CHG_LIM_COLS - 1])
 476                return -EINVAL;
 477
 478        for (col = 0; col <= DA9052_CHG_LIM_COLS - 1 ; col++) {
 479                if (*current_mA <= da9052_chg_current_lim[row][col])
 480                        break;
 481        }
 482
 483        return da9052_reg_update(bat->da9052, DA9052_ISET_REG,
 484                                 DA9052_ISET_USB_MASK, col);
 485}
 486
 487static int da9052_bat_get_property(struct power_supply *psy,
 488                                    enum power_supply_property psp,
 489                                    union power_supply_propval *val)
 490{
 491        int ret;
 492        int illegal;
 493        struct da9052_battery *bat = container_of(psy, struct da9052_battery,
 494                                                  psy);
 495
 496        ret = da9052_bat_check_presence(bat, &illegal);
 497        if (ret < 0)
 498                return ret;
 499
 500        if (illegal && psp != POWER_SUPPLY_PROP_PRESENT)
 501                return -ENODEV;
 502
 503        switch (psp) {
 504        case POWER_SUPPLY_PROP_STATUS:
 505                ret = da9052_bat_check_status(bat, &val->intval);
 506                break;
 507        case POWER_SUPPLY_PROP_ONLINE:
 508                val->intval =
 509                        (bat->charger_type == DA9052_NOCHARGER) ? 0 : 1;
 510                break;
 511        case POWER_SUPPLY_PROP_PRESENT:
 512                ret = da9052_bat_check_presence(bat, &val->intval);
 513                break;
 514        case POWER_SUPPLY_PROP_HEALTH:
 515                ret = da9052_bat_check_health(bat, &val->intval);
 516                break;
 517        case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 518                val->intval = DA9052_BAT_CUTOFF_VOLT * 1000;
 519                break;
 520        case POWER_SUPPLY_PROP_VOLTAGE_AVG:
 521                ret = da9052_bat_read_volt(bat, &val->intval);
 522                break;
 523        case POWER_SUPPLY_PROP_CURRENT_AVG:
 524                ret = da9052_read_chg_current(bat, &val->intval);
 525                break;
 526        case POWER_SUPPLY_PROP_CAPACITY:
 527                ret = da9052_bat_read_capacity(bat, &val->intval);
 528                break;
 529        case POWER_SUPPLY_PROP_TEMP:
 530                val->intval = da9052_adc_read_temp(bat->da9052);
 531                ret = val->intval;
 532                break;
 533        case POWER_SUPPLY_PROP_TECHNOLOGY:
 534                val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
 535                break;
 536        default:
 537                return -EINVAL;
 538        }
 539        return ret;
 540}
 541
 542static enum power_supply_property da9052_bat_props[] = {
 543        POWER_SUPPLY_PROP_STATUS,
 544        POWER_SUPPLY_PROP_ONLINE,
 545        POWER_SUPPLY_PROP_PRESENT,
 546        POWER_SUPPLY_PROP_HEALTH,
 547        POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 548        POWER_SUPPLY_PROP_VOLTAGE_AVG,
 549        POWER_SUPPLY_PROP_CURRENT_AVG,
 550        POWER_SUPPLY_PROP_CAPACITY,
 551        POWER_SUPPLY_PROP_TEMP,
 552        POWER_SUPPLY_PROP_TECHNOLOGY,
 553};
 554
 555static struct power_supply template_battery = {
 556        .name           = "da9052-bat",
 557        .type           = POWER_SUPPLY_TYPE_BATTERY,
 558        .properties     = da9052_bat_props,
 559        .num_properties = ARRAY_SIZE(da9052_bat_props),
 560        .get_property   = da9052_bat_get_property,
 561};
 562
 563static const char *const da9052_bat_irqs[] = {
 564        "BATT TEMP",
 565        "DCIN DET",
 566        "DCIN REM",
 567        "VBUS DET",
 568        "VBUS REM",
 569        "CHG END",
 570};
 571
 572static s32 __devinit da9052_bat_probe(struct platform_device *pdev)
 573{
 574        struct da9052_pdata *pdata;
 575        struct da9052_battery *bat;
 576        int ret;
 577        int irq;
 578        int i;
 579
 580        bat = kzalloc(sizeof(struct da9052_battery), GFP_KERNEL);
 581        if (!bat)
 582                return -ENOMEM;
 583
 584        bat->da9052 = dev_get_drvdata(pdev->dev.parent);
 585        bat->psy = template_battery;
 586        bat->charger_type = DA9052_NOCHARGER;
 587        bat->status = POWER_SUPPLY_STATUS_UNKNOWN;
 588        bat->health = POWER_SUPPLY_HEALTH_UNKNOWN;
 589        bat->nb.notifier_call = da9052_USB_current_notifier;
 590
 591        pdata = bat->da9052->dev->platform_data;
 592        if (pdata != NULL && pdata->use_for_apm)
 593                bat->psy.use_for_apm = pdata->use_for_apm;
 594        else
 595                bat->psy.use_for_apm = 1;
 596
 597        for (i = 0; i < ARRAY_SIZE(da9052_bat_irqs); i++) {
 598                irq = platform_get_irq_byname(pdev, da9052_bat_irqs[i]);
 599                ret = request_threaded_irq(bat->da9052->irq_base + irq,
 600                                           NULL, da9052_bat_irq,
 601                                           IRQF_TRIGGER_LOW | IRQF_ONESHOT,
 602                                           da9052_bat_irqs[i], bat);
 603                if (ret != 0) {
 604                        dev_err(bat->da9052->dev,
 605                                "DA9052 failed to request %s IRQ %d: %d\n",
 606                                da9052_bat_irqs[i], irq, ret);
 607                        goto err;
 608                }
 609        }
 610
 611        ret = power_supply_register(&pdev->dev, &bat->psy);
 612         if (ret)
 613                goto err;
 614
 615        platform_set_drvdata(pdev, bat);
 616        return 0;
 617
 618err:
 619        for (; i >= 0; i--) {
 620                irq = platform_get_irq_byname(pdev, da9052_bat_irqs[i]);
 621                free_irq(bat->da9052->irq_base + irq, bat);
 622        }
 623        kfree(bat);
 624        return ret;
 625}
 626static int __devexit da9052_bat_remove(struct platform_device *pdev)
 627{
 628        int i;
 629        int irq;
 630        struct da9052_battery *bat = platform_get_drvdata(pdev);
 631
 632        for (i = 0; i < ARRAY_SIZE(da9052_bat_irqs); i++) {
 633                irq = platform_get_irq_byname(pdev, da9052_bat_irqs[i]);
 634                free_irq(bat->da9052->irq_base + irq, bat);
 635        }
 636        power_supply_unregister(&bat->psy);
 637        kfree(bat);
 638
 639        return 0;
 640}
 641
 642static struct platform_driver da9052_bat_driver = {
 643        .probe = da9052_bat_probe,
 644        .remove = __devexit_p(da9052_bat_remove),
 645        .driver = {
 646                .name = "da9052-bat",
 647                .owner = THIS_MODULE,
 648        },
 649};
 650module_platform_driver(da9052_bat_driver);
 651
 652MODULE_DESCRIPTION("DA9052 BAT Device Driver");
 653MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
 654MODULE_LICENSE("GPL");
 655MODULE_ALIAS("platform:da9052-bat");
 656
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