drivers/power/twl4030_charger.c

   1 /*
   2  * TWL4030/TPS65950 BCI (Battery Charger Interface) driver
   3  *
   4  * Copyright (C) 2010 Gražvydas Ignotas <notasas@gmail.com>
   5  *
   6  * based on twl4030_bci_battery.c by TI
   7  * Copyright (C) 2008 Texas Instruments, Inc.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  */
  14
  15 #include <linux/init.h>
  16 #include <linux/module.h>
  17 #include <linux/slab.h>
  18 #include <linux/err.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/i2c/twl.h>
  22 #include <linux/power_supply.h>
  23 #include <linux/notifier.h>
  24 #include <linux/usb/otg.h>
  25 #include <linux/regulator/machine.h>
  26
  27 #define TWL4030_BCIMSTATEC      0x02
  28 #define TWL4030_BCIICHG         0x08
  29 #define TWL4030_BCIVAC          0x0a
  30 #define TWL4030_BCIVBUS         0x0c
  31 #define TWL4030_BCIMFSTS4       0x10
  32 #define TWL4030_BCICTL1         0x23
  33 #define TWL4030_BB_CFG          0x12
  34
  35 #define TWL4030_BCIAUTOWEN      BIT(5)
  36 #define TWL4030_CONFIG_DONE     BIT(4)
  37 #define TWL4030_BCIAUTOUSB      BIT(1)
  38 #define TWL4030_BCIAUTOAC       BIT(0)
  39 #define TWL4030_CGAIN           BIT(5)
  40 #define TWL4030_USBFASTMCHG     BIT(2)
  41 #define TWL4030_STS_VBUS        BIT(7)
  42 #define TWL4030_STS_USB_ID      BIT(2)
  43 #define TWL4030_BBCHEN          BIT(4)
  44 #define TWL4030_BBSEL_MASK      0x0c
  45 #define TWL4030_BBSEL_2V5       0x00
  46 #define TWL4030_BBSEL_3V0       0x04
  47 #define TWL4030_BBSEL_3V1       0x08
  48 #define TWL4030_BBSEL_3V2       0x0c
  49 #define TWL4030_BBISEL_MASK     0x03
  50 #define TWL4030_BBISEL_25uA     0x00
  51 #define TWL4030_BBISEL_150uA    0x01
  52 #define TWL4030_BBISEL_500uA    0x02
  53 #define TWL4030_BBISEL_1000uA   0x03
  54
  55 /* BCI interrupts */
  56 #define TWL4030_WOVF            BIT(0) /* Watchdog overflow */
  57 #define TWL4030_TMOVF           BIT(1) /* Timer overflow */
  58 #define TWL4030_ICHGHIGH        BIT(2) /* Battery charge current high */
  59 #define TWL4030_ICHGLOW         BIT(3) /* Battery cc. low / FSM state change */
  60 #define TWL4030_ICHGEOC         BIT(4) /* Battery current end-of-charge */
  61 #define TWL4030_TBATOR2         BIT(5) /* Battery temperature out of range 2 */
  62 #define TWL4030_TBATOR1         BIT(6) /* Battery temperature out of range 1 */
  63 #define TWL4030_BATSTS          BIT(7) /* Battery status */
  64
  65 #define TWL4030_VBATLVL         BIT(0) /* VBAT level */
  66 #define TWL4030_VBATOV          BIT(1) /* VBAT overvoltage */
  67 #define TWL4030_VBUSOV          BIT(2) /* VBUS overvoltage */
  68 #define TWL4030_ACCHGOV         BIT(3) /* Ac charger overvoltage */
  69
  70 #define TWL4030_MSTATEC_USB             BIT(4)
  71 #define TWL4030_MSTATEC_AC              BIT(5)
  72 #define TWL4030_MSTATEC_MASK            0x0f
  73 #define TWL4030_MSTATEC_QUICK1          0x02
  74 #define TWL4030_MSTATEC_QUICK7          0x07
  75 #define TWL4030_MSTATEC_COMPLETE1       0x0b
  76 #define TWL4030_MSTATEC_COMPLETE4       0x0e
  77
  78 static bool allow_usb;
  79 module_param(allow_usb, bool, 0644);
  80 MODULE_PARM_DESC(allow_usb, "Allow USB charge drawing default current");
  81
  82 struct twl4030_bci {
  83         struct device           *dev;
  84         struct power_supply     ac;
  85         struct power_supply     usb;
  86         struct usb_phy          *transceiver;
  87         struct notifier_block   usb_nb;
  88         struct work_struct      work;
  89         int                     irq_chg;
  90         int                     irq_bci;
  91         struct regulator        *usb_reg;
  92         int                     usb_enabled;
  93
  94         unsigned long           event;
  95 };
  96
  97 /*
  98  * clear and set bits on an given register on a given module
  99  */
 100 static int twl4030_clear_set(u8 mod_no, u8 clear, u8 set, u8 reg)
 101 {
 102         u8 val = 0;
 103         int ret;
 104
 105         ret = twl_i2c_read_u8(mod_no, &val, reg);
 106         if (ret)
 107                 return ret;
 108
 109         val &= ~clear;
 110         val |= set;
 111
 112         return twl_i2c_write_u8(mod_no, val, reg);
 113 }
 114
 115 static int twl4030_bci_read(u8 reg, u8 *val)
 116 {
 117         return twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, val, reg);
 118 }
 119
 120 static int twl4030_clear_set_boot_bci(u8 clear, u8 set)
 121 {
 122         return twl4030_clear_set(TWL_MODULE_PM_MASTER, clear,
 123                         TWL4030_CONFIG_DONE | TWL4030_BCIAUTOWEN | set,
 124                         TWL4030_PM_MASTER_BOOT_BCI);
 125 }
 126
 127 static int twl4030bci_read_adc_val(u8 reg)
 128 {
 129         int ret, temp;
 130         u8 val;
 131
 132         /* read MSB */
 133         ret = twl4030_bci_read(reg + 1, &val);
 134         if (ret)
 135                 return ret;
 136
 137         temp = (int)(val & 0x03) << 8;
 138
 139         /* read LSB */
 140         ret = twl4030_bci_read(reg, &val);
 141         if (ret)
 142                 return ret;
 143
 144         return temp | val;
 145 }
 146
 147 /*
 148  * Check if VBUS power is present
 149  */
 150 static int twl4030_bci_have_vbus(struct twl4030_bci *bci)
 151 {
 152         int ret;
 153         u8 hwsts;
 154
 155         ret = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &hwsts,
 156                               TWL4030_PM_MASTER_STS_HW_CONDITIONS);
 157         if (ret < 0)
 158                 return 0;
 159
 160         dev_dbg(bci->dev, "check_vbus: HW_CONDITIONS %02x\n", hwsts);
 161
 162         /* in case we also have STS_USB_ID, VBUS is driven by TWL itself */
 163         if ((hwsts & TWL4030_STS_VBUS) && !(hwsts & TWL4030_STS_USB_ID))
 164                 return 1;
 165
 166         return 0;
 167 }
 168
 169 /*
 170  * Enable/Disable USB Charge functionality.
 171  */
 172 static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
 173 {
 174         int ret;
 175
 176         if (enable) {
 177                 /* Check for USB charger connected */
 178                 if (!twl4030_bci_have_vbus(bci))
 179                         return -ENODEV;
 180
 181                 /*
 182                  * Until we can find out what current the device can provide,
 183                  * require a module param to enable USB charging.
 184                  */
 185                 if (!allow_usb) {
 186                         dev_warn(bci->dev, "USB charging is disabled.\n");
 187                         return -EACCES;
 188                 }
 189
 190                 /* Need to keep regulator on */
 191                 if (!bci->usb_enabled) {
 192                         regulator_enable(bci->usb_reg);
 193                         bci->usb_enabled = 1;
 194                 }
 195
 196                 /* forcing the field BCIAUTOUSB (BOOT_BCI[1]) to 1 */
 197                 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOUSB);
 198                 if (ret < 0)
 199                         return ret;
 200
 201                 /* forcing USBFASTMCHG(BCIMFSTS4[2]) to 1 */
 202                 ret = twl4030_clear_set(TWL_MODULE_MAIN_CHARGE, 0,
 203                         TWL4030_USBFASTMCHG, TWL4030_BCIMFSTS4);
 204         } else {
 205                 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOUSB, 0);
 206                 if (bci->usb_enabled) {
 207                         regulator_disable(bci->usb_reg);
 208                         bci->usb_enabled = 0;
 209                 }
 210         }
 211
 212         return ret;
 213 }
 214
 215 /*
 216  * Enable/Disable AC Charge funtionality.
 217  */
 218 static int twl4030_charger_enable_ac(bool enable)
 219 {
 220         int ret;
 221
 222         if (enable)
 223                 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOAC);
 224         else
 225                 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC, 0);
 226
 227         return ret;
 228 }
 229
 230 /*
 231  * Enable/Disable charging of Backup Battery.
 232  */
 233 static int twl4030_charger_enable_backup(int uvolt, int uamp)
 234 {
 235         int ret;
 236         u8 flags;
 237
 238         if (uvolt < 2500000 ||
 239             uamp < 25) {
 240                 /* disable charging of backup battery */
 241                 ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER,
 242                                         TWL4030_BBCHEN, 0, TWL4030_BB_CFG);
 243                 return ret;
 244         }
 245
 246         flags = TWL4030_BBCHEN;
 247         if (uvolt >= 3200000)
 248                 flags |= TWL4030_BBSEL_3V2;
 249         else if (uvolt >= 3100000)
 250                 flags |= TWL4030_BBSEL_3V1;
 251         else if (uvolt >= 3000000)
 252                 flags |= TWL4030_BBSEL_3V0;
 253         else
 254                 flags |= TWL4030_BBSEL_2V5;
 255
 256         if (uamp >= 1000)
 257                 flags |= TWL4030_BBISEL_1000uA;
 258         else if (uamp >= 500)
 259                 flags |= TWL4030_BBISEL_500uA;
 260         else if (uamp >= 150)
 261                 flags |= TWL4030_BBISEL_150uA;
 262         else
 263                 flags |= TWL4030_BBISEL_25uA;
 264
 265         ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER,
 266                                 TWL4030_BBSEL_MASK | TWL4030_BBISEL_MASK,
 267                                 flags,
 268                                 TWL4030_BB_CFG);
 269
 270         return ret;
 271 }
 272
 273 /*
 274  * TWL4030 CHG_PRES (AC charger presence) events
 275  */
 276 static irqreturn_t twl4030_charger_interrupt(int irq, void *arg)
 277 {
 278         struct twl4030_bci *bci = arg;
 279
 280         dev_dbg(bci->dev, "CHG_PRES irq\n");
 281         power_supply_changed(&bci->ac);
 282         power_supply_changed(&bci->usb);
 283
 284         return IRQ_HANDLED;
 285 }
 286
 287 /*
 288  * TWL4030 BCI monitoring events
 289  */
 290 static irqreturn_t twl4030_bci_interrupt(int irq, void *arg)
 291 {
 292         struct twl4030_bci *bci = arg;
 293         u8 irqs1, irqs2;
 294         int ret;
 295
 296         ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs1,
 297                               TWL4030_INTERRUPTS_BCIISR1A);
 298         if (ret < 0)
 299                 return IRQ_HANDLED;
 300
 301         ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs2,
 302                               TWL4030_INTERRUPTS_BCIISR2A);
 303         if (ret < 0)
 304                 return IRQ_HANDLED;
 305
 306         dev_dbg(bci->dev, "BCI irq %02x %02x\n", irqs2, irqs1);
 307
 308         if (irqs1 & (TWL4030_ICHGLOW | TWL4030_ICHGEOC)) {
 309                 /* charger state change, inform the core */
 310                 power_supply_changed(&bci->ac);
 311                 power_supply_changed(&bci->usb);
 312         }
 313
 314         /* various monitoring events, for now we just log them here */
 315         if (irqs1 & (TWL4030_TBATOR2 | TWL4030_TBATOR1))
 316                 dev_warn(bci->dev, "battery temperature out of range\n");
 317
 318         if (irqs1 & TWL4030_BATSTS)
 319                 dev_crit(bci->dev, "battery disconnected\n");
 320
 321         if (irqs2 & TWL4030_VBATOV)
 322                 dev_crit(bci->dev, "VBAT overvoltage\n");
 323
 324         if (irqs2 & TWL4030_VBUSOV)
 325                 dev_crit(bci->dev, "VBUS overvoltage\n");
 326
 327         if (irqs2 & TWL4030_ACCHGOV)
 328                 dev_crit(bci->dev, "Ac charger overvoltage\n");
 329
 330         return IRQ_HANDLED;
 331 }
 332
 333 static void twl4030_bci_usb_work(struct work_struct *data)
 334 {
 335         struct twl4030_bci *bci = container_of(data, struct twl4030_bci, work);
 336
 337         switch (bci->event) {
 338         case USB_EVENT_VBUS:
 339         case USB_EVENT_CHARGER:
 340                 twl4030_charger_enable_usb(bci, true);
 341                 break;
 342         case USB_EVENT_NONE:
 343                 twl4030_charger_enable_usb(bci, false);
 344                 break;
 345         }
 346 }
 347
 348 static int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val,
 349                                void *priv)
 350 {
 351         struct twl4030_bci *bci = container_of(nb, struct twl4030_bci, usb_nb);
 352
 353         dev_dbg(bci->dev, "OTG notify %lu\n", val);
 354
 355         bci->event = val;
 356         schedule_work(&bci->work);
 357
 358         return NOTIFY_OK;
 359 }
 360
 361 /*
 362  * TI provided formulas:
 363  * CGAIN == 0: ICHG = (BCIICHG * 1.7) / (2^10 - 1) - 0.85
 364  * CGAIN == 1: ICHG = (BCIICHG * 3.4) / (2^10 - 1) - 1.7
 365  * Here we use integer approximation of:
 366  * CGAIN == 0: val * 1.6618 - 0.85
 367  * CGAIN == 1: (val * 1.6618 - 0.85) * 2
 368  */
 369 static int twl4030_charger_get_current(void)
 370 {
 371         int curr;
 372         int ret;
 373         u8 bcictl1;
 374
 375         curr = twl4030bci_read_adc_val(TWL4030_BCIICHG);
 376         if (curr < 0)
 377                 return curr;
 378
 379         ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
 380         if (ret)
 381                 return ret;
 382
 383         ret = (curr * 16618 - 850 * 10000) / 10;
 384         if (bcictl1 & TWL4030_CGAIN)
 385                 ret *= 2;
 386
 387         return ret;
 388 }
 389
 390 /*
 391  * Returns the main charge FSM state
 392  * Or < 0 on failure.
 393  */
 394 static int twl4030bci_state(struct twl4030_bci *bci)
 395 {
 396         int ret;
 397         u8 state;
 398
 399         ret = twl4030_bci_read(TWL4030_BCIMSTATEC, &state);
 400         if (ret) {
 401                 pr_err("twl4030_bci: error reading BCIMSTATEC\n");
 402                 return ret;
 403         }
 404
 405         dev_dbg(bci->dev, "state: %02x\n", state);
 406
 407         return state;
 408 }
 409
 410 static int twl4030_bci_state_to_status(int state)
 411 {
 412         state &= TWL4030_MSTATEC_MASK;
 413         if (TWL4030_MSTATEC_QUICK1 <= state && state <= TWL4030_MSTATEC_QUICK7)
 414                 return POWER_SUPPLY_STATUS_CHARGING;
 415         else if (TWL4030_MSTATEC_COMPLETE1 <= state &&
 416                                         state <= TWL4030_MSTATEC_COMPLETE4)
 417                 return POWER_SUPPLY_STATUS_FULL;
 418         else
 419                 return POWER_SUPPLY_STATUS_NOT_CHARGING;
 420 }
 421
 422 static int twl4030_bci_get_property(struct power_supply *psy,
 423                                     enum power_supply_property psp,
 424                                     union power_supply_propval *val)
 425 {
 426         struct twl4030_bci *bci = dev_get_drvdata(psy->dev->parent);
 427         int is_charging;
 428         int state;
 429         int ret;
 430
 431         state = twl4030bci_state(bci);
 432         if (state < 0)
 433                 return state;
 434
 435         if (psy->type == POWER_SUPPLY_TYPE_USB)
 436                 is_charging = state & TWL4030_MSTATEC_USB;
 437         else
 438                 is_charging = state & TWL4030_MSTATEC_AC;
 439
 440         switch (psp) {
 441         case POWER_SUPPLY_PROP_STATUS:
 442                 if (is_charging)
 443                         val->intval = twl4030_bci_state_to_status(state);
 444                 else
 445                         val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
 446                 break;
 447         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 448                 /* charging must be active for meaningful result */
 449                 if (!is_charging)
 450                         return -ENODATA;
 451                 if (psy->type == POWER_SUPPLY_TYPE_USB) {
 452                         ret = twl4030bci_read_adc_val(TWL4030_BCIVBUS);
 453                         if (ret < 0)
 454                                 return ret;
 455                         /* BCIVBUS uses ADCIN8, 7/1023 V/step */
 456                         val->intval = ret * 6843;
 457                 } else {
 458                         ret = twl4030bci_read_adc_val(TWL4030_BCIVAC);
 459                         if (ret < 0)
 460                                 return ret;
 461                         /* BCIVAC uses ADCIN11, 10/1023 V/step */
 462                         val->intval = ret * 9775;
 463                 }
 464                 break;
 465         case POWER_SUPPLY_PROP_CURRENT_NOW:
 466                 if (!is_charging)
 467                         return -ENODATA;
 468                 /* current measurement is shared between AC and USB */
 469                 ret = twl4030_charger_get_current();
 470                 if (ret < 0)
 471                         return ret;
 472                 val->intval = ret;
 473                 break;
 474         case POWER_SUPPLY_PROP_ONLINE:
 475                 val->intval = is_charging &&
 476                         twl4030_bci_state_to_status(state) !=
 477                                 POWER_SUPPLY_STATUS_NOT_CHARGING;
 478                 break;
 479         default:
 480                 return -EINVAL;
 481         }
 482
 483         return 0;
 484 }
 485
 486 static enum power_supply_property twl4030_charger_props[] = {
 487         POWER_SUPPLY_PROP_STATUS,
 488         POWER_SUPPLY_PROP_ONLINE,
 489         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 490         POWER_SUPPLY_PROP_CURRENT_NOW,
 491 };
 492
 493 static int __init twl4030_bci_probe(struct platform_device *pdev)
 494 {
 495         struct twl4030_bci *bci;
 496         struct twl4030_bci_platform_data *pdata = pdev->dev.platform_data;
 497         int ret;
 498         u32 reg;
 499
 500         bci = kzalloc(sizeof(*bci), GFP_KERNEL);
 501         if (bci == NULL)
 502                 return -ENOMEM;
 503
 504         bci->dev = &pdev->dev;
 505         bci->irq_chg = platform_get_irq(pdev, 0);
 506         bci->irq_bci = platform_get_irq(pdev, 1);
 507
 508         platform_set_drvdata(pdev, bci);
 509
 510         bci->ac.name = "twl4030_ac";
 511         bci->ac.type = POWER_SUPPLY_TYPE_MAINS;
 512         bci->ac.properties = twl4030_charger_props;
 513         bci->ac.num_properties = ARRAY_SIZE(twl4030_charger_props);
 514         bci->ac.get_property = twl4030_bci_get_property;
 515
 516         ret = power_supply_register(&pdev->dev, &bci->ac);
 517         if (ret) {
 518                 dev_err(&pdev->dev, "failed to register ac: %d\n", ret);
 519                 goto fail_register_ac;
 520         }
 521
 522         bci->usb.name = "twl4030_usb";
 523         bci->usb.type = POWER_SUPPLY_TYPE_USB;
 524         bci->usb.properties = twl4030_charger_props;
 525         bci->usb.num_properties = ARRAY_SIZE(twl4030_charger_props);
 526         bci->usb.get_property = twl4030_bci_get_property;
 527
 528         bci->usb_reg = regulator_get(bci->dev, "bci3v1");
 529
 530         ret = power_supply_register(&pdev->dev, &bci->usb);
 531         if (ret) {
 532                 dev_err(&pdev->dev, "failed to register usb: %d\n", ret);
 533                 goto fail_register_usb;
 534         }
 535
 536         ret = request_threaded_irq(bci->irq_chg, NULL,
 537                         twl4030_charger_interrupt, IRQF_ONESHOT, pdev->name,
 538                         bci);
 539         if (ret < 0) {
 540                 dev_err(&pdev->dev, "could not request irq %d, status %d\n",
 541                         bci->irq_chg, ret);
 542                 goto fail_chg_irq;
 543         }
 544
 545         ret = request_threaded_irq(bci->irq_bci, NULL,
 546                         twl4030_bci_interrupt, IRQF_ONESHOT, pdev->name, bci);
 547         if (ret < 0) {
 548                 dev_err(&pdev->dev, "could not request irq %d, status %d\n",
 549                         bci->irq_bci, ret);
 550                 goto fail_bci_irq;
 551         }
 552
 553         INIT_WORK(&bci->work, twl4030_bci_usb_work);
 554
 555         bci->transceiver = usb_get_phy(USB_PHY_TYPE_USB2);
 556         if (!IS_ERR_OR_NULL(bci->transceiver)) {
 557                 bci->usb_nb.notifier_call = twl4030_bci_usb_ncb;
 558                 usb_register_notifier(bci->transceiver, &bci->usb_nb);
 559         }
 560
 561         /* Enable interrupts now. */
 562         reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_ICHGEOC | TWL4030_TBATOR2 |
 563                 TWL4030_TBATOR1 | TWL4030_BATSTS);
 564         ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
 565                                TWL4030_INTERRUPTS_BCIIMR1A);
 566         if (ret < 0) {
 567                 dev_err(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
 568                 goto fail_unmask_interrupts;
 569         }
 570
 571         reg = ~(u32)(TWL4030_VBATOV | TWL4030_VBUSOV | TWL4030_ACCHGOV);
 572         ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
 573                                TWL4030_INTERRUPTS_BCIIMR2A);
 574         if (ret < 0)
 575                 dev_warn(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
 576
 577         twl4030_charger_enable_ac(true);
 578         twl4030_charger_enable_usb(bci, true);
 579         twl4030_charger_enable_backup(pdata->bb_uvolt,
 580                                       pdata->bb_uamp);
 581
 582         return 0;
 583
 584 fail_unmask_interrupts:
 585         if (!IS_ERR_OR_NULL(bci->transceiver)) {
 586                 usb_unregister_notifier(bci->transceiver, &bci->usb_nb);
 587                 usb_put_phy(bci->transceiver);
 588         }
 589         free_irq(bci->irq_bci, bci);
 590 fail_bci_irq:
 591         free_irq(bci->irq_chg, bci);
 592 fail_chg_irq:
 593         power_supply_unregister(&bci->usb);
 594 fail_register_usb:
 595         power_supply_unregister(&bci->ac);
 596 fail_register_ac:
 597         platform_set_drvdata(pdev, NULL);
 598         kfree(bci);
 599
 600         return ret;
 601 }
 602
 603 static int __exit twl4030_bci_remove(struct platform_device *pdev)
 604 {
 605         struct twl4030_bci *bci = platform_get_drvdata(pdev);
 606
 607         twl4030_charger_enable_ac(false);
 608         twl4030_charger_enable_usb(bci, false);
 609         twl4030_charger_enable_backup(0, 0);
 610
 611         /* mask interrupts */
 612         twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
 613                          TWL4030_INTERRUPTS_BCIIMR1A);
 614         twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
 615                          TWL4030_INTERRUPTS_BCIIMR2A);
 616
 617         if (!IS_ERR_OR_NULL(bci->transceiver)) {
 618                 usb_unregister_notifier(bci->transceiver, &bci->usb_nb);
 619                 usb_put_phy(bci->transceiver);
 620         }
 621         free_irq(bci->irq_bci, bci);
 622         free_irq(bci->irq_chg, bci);
 623         power_supply_unregister(&bci->usb);
 624         power_supply_unregister(&bci->ac);
 625         platform_set_drvdata(pdev, NULL);
 626         kfree(bci);
 627
 628         return 0;
 629 }
 630
 631 static struct platform_driver twl4030_bci_driver = {
 632         .driver = {
 633                 .name   = "twl4030_bci",
 634                 .owner  = THIS_MODULE,
 635         },
 636         .remove = __exit_p(twl4030_bci_remove),
 637 };
 638
 639 static int __init twl4030_bci_init(void)
 640 {
 641         return platform_driver_probe(&twl4030_bci_driver, twl4030_bci_probe);
 642 }
 643 module_init(twl4030_bci_init);
 644
 645 static void __exit twl4030_bci_exit(void)
 646 {
 647         platform_driver_unregister(&twl4030_bci_driver);
 648 }
 649 module_exit(twl4030_bci_exit);
 650
 651 MODULE_AUTHOR("Gražvydas Ignotas");
 652 MODULE_DESCRIPTION("TWL4030 Battery Charger Interface driver");
 653 MODULE_LICENSE("GPL");
 654 MODULE_ALIAS("platform:twl4030_bci");