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                         ret = regulator_enable(bci->usb_reg);
 193                         if (ret) {
 194                                 dev_err(bci->dev,
 195                                         "Failed to enable regulator\n");
 196                                 return ret;
 197                         }
 198                         bci->usb_enabled = 1;
 199                 }
 200
 201                 /* forcing the field BCIAUTOUSB (BOOT_BCI[1]) to 1 */
 202                 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOUSB);
 203                 if (ret < 0)
 204                         return ret;
 205
 206                 /* forcing USBFASTMCHG(BCIMFSTS4[2]) to 1 */
 207                 ret = twl4030_clear_set(TWL_MODULE_MAIN_CHARGE, 0,
 208                         TWL4030_USBFASTMCHG, TWL4030_BCIMFSTS4);
 209         } else {
 210                 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOUSB, 0);
 211                 if (bci->usb_enabled) {
 212                         regulator_disable(bci->usb_reg);
 213                         bci->usb_enabled = 0;
 214                 }
 215         }
 216
 217         return ret;
 218 }
 219
 220 /*
 221  * Enable/Disable AC Charge funtionality.
 222  */
 223 static int twl4030_charger_enable_ac(bool enable)
 224 {
 225         int ret;
 226
 227         if (enable)
 228                 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOAC);
 229         else
 230                 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC, 0);
 231
 232         return ret;
 233 }
 234
 235 /*
 236  * Enable/Disable charging of Backup Battery.
 237  */
 238 static int twl4030_charger_enable_backup(int uvolt, int uamp)
 239 {
 240         int ret;
 241         u8 flags;
 242
 243         if (uvolt < 2500000 ||
 244             uamp < 25) {
 245                 /* disable charging of backup battery */
 246                 ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER,
 247                                         TWL4030_BBCHEN, 0, TWL4030_BB_CFG);
 248                 return ret;
 249         }
 250
 251         flags = TWL4030_BBCHEN;
 252         if (uvolt >= 3200000)
 253                 flags |= TWL4030_BBSEL_3V2;
 254         else if (uvolt >= 3100000)
 255                 flags |= TWL4030_BBSEL_3V1;
 256         else if (uvolt >= 3000000)
 257                 flags |= TWL4030_BBSEL_3V0;
 258         else
 259                 flags |= TWL4030_BBSEL_2V5;
 260
 261         if (uamp >= 1000)
 262                 flags |= TWL4030_BBISEL_1000uA;
 263         else if (uamp >= 500)
 264                 flags |= TWL4030_BBISEL_500uA;
 265         else if (uamp >= 150)
 266                 flags |= TWL4030_BBISEL_150uA;
 267         else
 268                 flags |= TWL4030_BBISEL_25uA;
 269
 270         ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER,
 271                                 TWL4030_BBSEL_MASK | TWL4030_BBISEL_MASK,
 272                                 flags,
 273                                 TWL4030_BB_CFG);
 274
 275         return ret;
 276 }
 277
 278 /*
 279  * TWL4030 CHG_PRES (AC charger presence) events
 280  */
 281 static irqreturn_t twl4030_charger_interrupt(int irq, void *arg)
 282 {
 283         struct twl4030_bci *bci = arg;
 284
 285         dev_dbg(bci->dev, "CHG_PRES irq\n");
 286         power_supply_changed(&bci->ac);
 287         power_supply_changed(&bci->usb);
 288
 289         return IRQ_HANDLED;
 290 }
 291
 292 /*
 293  * TWL4030 BCI monitoring events
 294  */
 295 static irqreturn_t twl4030_bci_interrupt(int irq, void *arg)
 296 {
 297         struct twl4030_bci *bci = arg;
 298         u8 irqs1, irqs2;
 299         int ret;
 300
 301         ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs1,
 302                               TWL4030_INTERRUPTS_BCIISR1A);
 303         if (ret < 0)
 304                 return IRQ_HANDLED;
 305
 306         ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs2,
 307                               TWL4030_INTERRUPTS_BCIISR2A);
 308         if (ret < 0)
 309                 return IRQ_HANDLED;
 310
 311         dev_dbg(bci->dev, "BCI irq %02x %02x\n", irqs2, irqs1);
 312
 313         if (irqs1 & (TWL4030_ICHGLOW | TWL4030_ICHGEOC)) {
 314                 /* charger state change, inform the core */
 315                 power_supply_changed(&bci->ac);
 316                 power_supply_changed(&bci->usb);
 317         }
 318
 319         /* various monitoring events, for now we just log them here */
 320         if (irqs1 & (TWL4030_TBATOR2 | TWL4030_TBATOR1))
 321                 dev_warn(bci->dev, "battery temperature out of range\n");
 322
 323         if (irqs1 & TWL4030_BATSTS)
 324                 dev_crit(bci->dev, "battery disconnected\n");
 325
 326         if (irqs2 & TWL4030_VBATOV)
 327                 dev_crit(bci->dev, "VBAT overvoltage\n");
 328
 329         if (irqs2 & TWL4030_VBUSOV)
 330                 dev_crit(bci->dev, "VBUS overvoltage\n");
 331
 332         if (irqs2 & TWL4030_ACCHGOV)
 333                 dev_crit(bci->dev, "Ac charger overvoltage\n");
 334
 335         return IRQ_HANDLED;
 336 }
 337
 338 static void twl4030_bci_usb_work(struct work_struct *data)
 339 {
 340         struct twl4030_bci *bci = container_of(data, struct twl4030_bci, work);
 341
 342         switch (bci->event) {
 343         case USB_EVENT_VBUS:
 344         case USB_EVENT_CHARGER:
 345                 twl4030_charger_enable_usb(bci, true);
 346                 break;
 347         case USB_EVENT_NONE:
 348                 twl4030_charger_enable_usb(bci, false);
 349                 break;
 350         }
 351 }
 352
 353 static int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val,
 354                                void *priv)
 355 {
 356         struct twl4030_bci *bci = container_of(nb, struct twl4030_bci, usb_nb);
 357
 358         dev_dbg(bci->dev, "OTG notify %lu\n", val);
 359
 360         bci->event = val;
 361         schedule_work(&bci->work);
 362
 363         return NOTIFY_OK;
 364 }
 365
 366 /*
 367  * TI provided formulas:
 368  * CGAIN == 0: ICHG = (BCIICHG * 1.7) / (2^10 - 1) - 0.85
 369  * CGAIN == 1: ICHG = (BCIICHG * 3.4) / (2^10 - 1) - 1.7
 370  * Here we use integer approximation of:
 371  * CGAIN == 0: val * 1.6618 - 0.85
 372  * CGAIN == 1: (val * 1.6618 - 0.85) * 2
 373  */
 374 static int twl4030_charger_get_current(void)
 375 {
 376         int curr;
 377         int ret;
 378         u8 bcictl1;
 379
 380         curr = twl4030bci_read_adc_val(TWL4030_BCIICHG);
 381         if (curr < 0)
 382                 return curr;
 383
 384         ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
 385         if (ret)
 386                 return ret;
 387
 388         ret = (curr * 16618 - 850 * 10000) / 10;
 389         if (bcictl1 & TWL4030_CGAIN)
 390                 ret *= 2;
 391
 392         return ret;
 393 }
 394
 395 /*
 396  * Returns the main charge FSM state
 397  * Or < 0 on failure.
 398  */
 399 static int twl4030bci_state(struct twl4030_bci *bci)
 400 {
 401         int ret;
 402         u8 state;
 403
 404         ret = twl4030_bci_read(TWL4030_BCIMSTATEC, &state);
 405         if (ret) {
 406                 pr_err("twl4030_bci: error reading BCIMSTATEC\n");
 407                 return ret;
 408         }
 409
 410         dev_dbg(bci->dev, "state: %02x\n", state);
 411
 412         return state;
 413 }
 414
 415 static int twl4030_bci_state_to_status(int state)
 416 {
 417         state &= TWL4030_MSTATEC_MASK;
 418         if (TWL4030_MSTATEC_QUICK1 <= state && state <= TWL4030_MSTATEC_QUICK7)
 419                 return POWER_SUPPLY_STATUS_CHARGING;
 420         else if (TWL4030_MSTATEC_COMPLETE1 <= state &&
 421                                         state <= TWL4030_MSTATEC_COMPLETE4)
 422                 return POWER_SUPPLY_STATUS_FULL;
 423         else
 424                 return POWER_SUPPLY_STATUS_NOT_CHARGING;
 425 }
 426
 427 static int twl4030_bci_get_property(struct power_supply *psy,
 428                                     enum power_supply_property psp,
 429                                     union power_supply_propval *val)
 430 {
 431         struct twl4030_bci *bci = dev_get_drvdata(psy->dev->parent);
 432         int is_charging;
 433         int state;
 434         int ret;
 435
 436         state = twl4030bci_state(bci);
 437         if (state < 0)
 438                 return state;
 439
 440         if (psy->type == POWER_SUPPLY_TYPE_USB)
 441                 is_charging = state & TWL4030_MSTATEC_USB;
 442         else
 443                 is_charging = state & TWL4030_MSTATEC_AC;
 444
 445         switch (psp) {
 446         case POWER_SUPPLY_PROP_STATUS:
 447                 if (is_charging)
 448                         val->intval = twl4030_bci_state_to_status(state);
 449                 else
 450                         val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
 451                 break;
 452         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 453                 /* charging must be active for meaningful result */
 454                 if (!is_charging)
 455                         return -ENODATA;
 456                 if (psy->type == POWER_SUPPLY_TYPE_USB) {
 457                         ret = twl4030bci_read_adc_val(TWL4030_BCIVBUS);
 458                         if (ret < 0)
 459                                 return ret;
 460                         /* BCIVBUS uses ADCIN8, 7/1023 V/step */
 461                         val->intval = ret * 6843;
 462                 } else {
 463                         ret = twl4030bci_read_adc_val(TWL4030_BCIVAC);
 464                         if (ret < 0)
 465                                 return ret;
 466                         /* BCIVAC uses ADCIN11, 10/1023 V/step */
 467                         val->intval = ret * 9775;
 468                 }
 469                 break;
 470         case POWER_SUPPLY_PROP_CURRENT_NOW:
 471                 if (!is_charging)
 472                         return -ENODATA;
 473                 /* current measurement is shared between AC and USB */
 474                 ret = twl4030_charger_get_current();
 475                 if (ret < 0)
 476                         return ret;
 477                 val->intval = ret;
 478                 break;
 479         case POWER_SUPPLY_PROP_ONLINE:
 480                 val->intval = is_charging &&
 481                         twl4030_bci_state_to_status(state) !=
 482                                 POWER_SUPPLY_STATUS_NOT_CHARGING;
 483                 break;
 484         default:
 485                 return -EINVAL;
 486         }
 487
 488         return 0;
 489 }
 490
 491 static enum power_supply_property twl4030_charger_props[] = {
 492         POWER_SUPPLY_PROP_STATUS,
 493         POWER_SUPPLY_PROP_ONLINE,
 494         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 495         POWER_SUPPLY_PROP_CURRENT_NOW,
 496 };
 497
 498 #ifdef CONFIG_OF
 499 static const struct twl4030_bci_platform_data *
 500 twl4030_bci_parse_dt(struct device *dev)
 501 {
 502         struct device_node *np = dev->of_node;
 503         struct twl4030_bci_platform_data *pdata;
 504         u32 num;
 505
 506         if (!np)
 507                 return NULL;
 508         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 509         if (!pdata)
 510                 return pdata;
 511
 512         if (of_property_read_u32(np, "ti,bb-uvolt", &num) == 0)
 513                 pdata->bb_uvolt = num;
 514         if (of_property_read_u32(np, "ti,bb-uamp", &num) == 0)
 515                 pdata->bb_uamp = num;
 516         return pdata;
 517 }
 518 #else
 519 static inline const struct twl4030_bci_platform_data *
 520 twl4030_bci_parse_dt(struct device *dev)
 521 {
 522         return NULL;
 523 }
 524 #endif
 525
 526 static int __init twl4030_bci_probe(struct platform_device *pdev)
 527 {
 528         struct twl4030_bci *bci;
 529         const struct twl4030_bci_platform_data *pdata = pdev->dev.platform_data;
 530         int ret;
 531         u32 reg;
 532
 533         bci = kzalloc(sizeof(*bci), GFP_KERNEL);
 534         if (bci == NULL)
 535                 return -ENOMEM;
 536
 537         if (!pdata)
 538                 pdata = twl4030_bci_parse_dt(&pdev->dev);
 539
 540         bci->dev = &pdev->dev;
 541         bci->irq_chg = platform_get_irq(pdev, 0);
 542         bci->irq_bci = platform_get_irq(pdev, 1);
 543
 544         platform_set_drvdata(pdev, bci);
 545
 546         bci->ac.name = "twl4030_ac";
 547         bci->ac.type = POWER_SUPPLY_TYPE_MAINS;
 548         bci->ac.properties = twl4030_charger_props;
 549         bci->ac.num_properties = ARRAY_SIZE(twl4030_charger_props);
 550         bci->ac.get_property = twl4030_bci_get_property;
 551
 552         ret = power_supply_register(&pdev->dev, &bci->ac);
 553         if (ret) {
 554                 dev_err(&pdev->dev, "failed to register ac: %d\n", ret);
 555                 goto fail_register_ac;
 556         }
 557
 558         bci->usb.name = "twl4030_usb";
 559         bci->usb.type = POWER_SUPPLY_TYPE_USB;
 560         bci->usb.properties = twl4030_charger_props;
 561         bci->usb.num_properties = ARRAY_SIZE(twl4030_charger_props);
 562         bci->usb.get_property = twl4030_bci_get_property;
 563
 564         bci->usb_reg = regulator_get(bci->dev, "bci3v1");
 565
 566         ret = power_supply_register(&pdev->dev, &bci->usb);
 567         if (ret) {
 568                 dev_err(&pdev->dev, "failed to register usb: %d\n", ret);
 569                 goto fail_register_usb;
 570         }
 571
 572         ret = request_threaded_irq(bci->irq_chg, NULL,
 573                         twl4030_charger_interrupt, IRQF_ONESHOT, pdev->name,
 574                         bci);
 575         if (ret < 0) {
 576                 dev_err(&pdev->dev, "could not request irq %d, status %d\n",
 577                         bci->irq_chg, ret);
 578                 goto fail_chg_irq;
 579         }
 580
 581         ret = request_threaded_irq(bci->irq_bci, NULL,
 582                         twl4030_bci_interrupt, IRQF_ONESHOT, pdev->name, bci);
 583         if (ret < 0) {
 584                 dev_err(&pdev->dev, "could not request irq %d, status %d\n",
 585                         bci->irq_bci, ret);
 586                 goto fail_bci_irq;
 587         }
 588
 589         INIT_WORK(&bci->work, twl4030_bci_usb_work);
 590
 591         bci->transceiver = usb_get_phy(USB_PHY_TYPE_USB2);
 592         if (!IS_ERR_OR_NULL(bci->transceiver)) {
 593                 bci->usb_nb.notifier_call = twl4030_bci_usb_ncb;
 594                 usb_register_notifier(bci->transceiver, &bci->usb_nb);
 595         }
 596
 597         /* Enable interrupts now. */
 598         reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_ICHGEOC | TWL4030_TBATOR2 |
 599                 TWL4030_TBATOR1 | TWL4030_BATSTS);
 600         ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
 601                                TWL4030_INTERRUPTS_BCIIMR1A);
 602         if (ret < 0) {
 603                 dev_err(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
 604                 goto fail_unmask_interrupts;
 605         }
 606
 607         reg = ~(u32)(TWL4030_VBATOV | TWL4030_VBUSOV | TWL4030_ACCHGOV);
 608         ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
 609                                TWL4030_INTERRUPTS_BCIIMR2A);
 610         if (ret < 0)
 611                 dev_warn(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
 612
 613         twl4030_charger_enable_ac(true);
 614         twl4030_charger_enable_usb(bci, true);
 615         if (pdata)
 616                 twl4030_charger_enable_backup(pdata->bb_uvolt,
 617                                               pdata->bb_uamp);
 618         else
 619                 twl4030_charger_enable_backup(0, 0);
 620
 621         return 0;
 622
 623 fail_unmask_interrupts:
 624         if (!IS_ERR_OR_NULL(bci->transceiver)) {
 625                 usb_unregister_notifier(bci->transceiver, &bci->usb_nb);
 626                 usb_put_phy(bci->transceiver);
 627         }
 628         free_irq(bci->irq_bci, bci);
 629 fail_bci_irq:
 630         free_irq(bci->irq_chg, bci);
 631 fail_chg_irq:
 632         power_supply_unregister(&bci->usb);
 633 fail_register_usb:
 634         power_supply_unregister(&bci->ac);
 635 fail_register_ac:
 636         kfree(bci);
 637
 638         return ret;
 639 }
 640
 641 static int __exit twl4030_bci_remove(struct platform_device *pdev)
 642 {
 643         struct twl4030_bci *bci = platform_get_drvdata(pdev);
 644
 645         twl4030_charger_enable_ac(false);
 646         twl4030_charger_enable_usb(bci, false);
 647         twl4030_charger_enable_backup(0, 0);
 648
 649         /* mask interrupts */
 650         twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
 651                          TWL4030_INTERRUPTS_BCIIMR1A);
 652         twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
 653                          TWL4030_INTERRUPTS_BCIIMR2A);
 654
 655         if (!IS_ERR_OR_NULL(bci->transceiver)) {
 656                 usb_unregister_notifier(bci->transceiver, &bci->usb_nb);
 657                 usb_put_phy(bci->transceiver);
 658         }
 659         free_irq(bci->irq_bci, bci);
 660         free_irq(bci->irq_chg, bci);
 661         power_supply_unregister(&bci->usb);
 662         power_supply_unregister(&bci->ac);
 663         kfree(bci);
 664
 665         return 0;
 666 }
 667
 668 static const struct of_device_id twl_bci_of_match[] = {
 669         {.compatible = "ti,twl4030-bci", },
 670         { }
 671 };
 672 MODULE_DEVICE_TABLE(of, twl_bci_of_match);
 673
 674 static struct platform_driver twl4030_bci_driver = {
 675         .driver = {
 676                 .name   = "twl4030_bci",
 677                 .owner  = THIS_MODULE,
 678                 .of_match_table = of_match_ptr(twl_bci_of_match),
 679         },
 680         .remove = __exit_p(twl4030_bci_remove),
 681 };
 682
 683 module_platform_driver_probe(twl4030_bci_driver, twl4030_bci_probe);
 684
 685 MODULE_AUTHOR("Gražvydas Ignotas");
 686 MODULE_DESCRIPTION("TWL4030 Battery Charger Interface driver");
 687 MODULE_LICENSE("GPL");
 688 MODULE_ALIAS("platform:twl4030_bci");