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_BCIMFSTS3       0x0F
  32 #define TWL4030_BCIMFSTS4       0x10
  33 #define TWL4030_BCICTL1         0x23
  34 #define TWL4030_BB_CFG          0x12
  35
  36 #define TWL4030_BCIMFSTS1       0x01
  37
  38 #define TWL4030_BCIAUTOWEN      BIT(5)
  39 #define TWL4030_CONFIG_DONE     BIT(4)
  40 #define TWL4030_BCIAUTOUSB      BIT(1)
  41 #define TWL4030_BCIAUTOAC       BIT(0)
  42 #define TWL4030_CGAIN           BIT(5)
  43 #define TWL4030_USBFASTMCHG     BIT(2)
  44 #define TWL4030_STS_VBUS        BIT(7)
  45 #define TWL4030_STS_USB_ID      BIT(2)
  46 #define TWL4030_BBCHEN          BIT(4)
  47 #define TWL4030_BBSEL_MASK      0x0c
  48 #define TWL4030_BBSEL_2V5       0x00
  49 #define TWL4030_BBSEL_3V0       0x04
  50 #define TWL4030_BBSEL_3V1       0x08
  51 #define TWL4030_BBSEL_3V2       0x0c
  52 #define TWL4030_BBISEL_MASK     0x03
  53 #define TWL4030_BBISEL_25uA     0x00
  54 #define TWL4030_BBISEL_150uA    0x01
  55 #define TWL4030_BBISEL_500uA    0x02
  56 #define TWL4030_BBISEL_1000uA   0x03
  57
  58 #define TWL4030_BATSTSPCHG      BIT(2)
  59 #define TWL4030_BATSTSMCHG      BIT(6)
  60
  61 /* BCI interrupts */
  62 #define TWL4030_WOVF            BIT(0) /* Watchdog overflow */
  63 #define TWL4030_TMOVF           BIT(1) /* Timer overflow */
  64 #define TWL4030_ICHGHIGH        BIT(2) /* Battery charge current high */
  65 #define TWL4030_ICHGLOW         BIT(3) /* Battery cc. low / FSM state change */
  66 #define TWL4030_ICHGEOC         BIT(4) /* Battery current end-of-charge */
  67 #define TWL4030_TBATOR2         BIT(5) /* Battery temperature out of range 2 */
  68 #define TWL4030_TBATOR1         BIT(6) /* Battery temperature out of range 1 */
  69 #define TWL4030_BATSTS          BIT(7) /* Battery status */
  70
  71 #define TWL4030_VBATLVL         BIT(0) /* VBAT level */
  72 #define TWL4030_VBATOV          BIT(1) /* VBAT overvoltage */
  73 #define TWL4030_VBUSOV          BIT(2) /* VBUS overvoltage */
  74 #define TWL4030_ACCHGOV         BIT(3) /* Ac charger overvoltage */
  75
  76 #define TWL4030_MSTATEC_USB             BIT(4)
  77 #define TWL4030_MSTATEC_AC              BIT(5)
  78 #define TWL4030_MSTATEC_MASK            0x0f
  79 #define TWL4030_MSTATEC_QUICK1          0x02
  80 #define TWL4030_MSTATEC_QUICK7          0x07
  81 #define TWL4030_MSTATEC_COMPLETE1       0x0b
  82 #define TWL4030_MSTATEC_COMPLETE4       0x0e
  83
  84 static bool allow_usb;
  85 module_param(allow_usb, bool, 0644);
  86 MODULE_PARM_DESC(allow_usb, "Allow USB charge drawing default current");
  87
  88 struct twl4030_bci {
  89         struct device           *dev;
  90         struct power_supply     ac;
  91         struct power_supply     usb;
  92         struct usb_phy          *transceiver;
  93         struct notifier_block   usb_nb;
  94         struct work_struct      work;
  95         int                     irq_chg;
  96         int                     irq_bci;
  97         struct regulator        *usb_reg;
  98         int                     usb_enabled;
  99
 100         unsigned long           event;
 101 };
 102
 103 /*
 104  * clear and set bits on an given register on a given module
 105  */
 106 static int twl4030_clear_set(u8 mod_no, u8 clear, u8 set, u8 reg)
 107 {
 108         u8 val = 0;
 109         int ret;
 110
 111         ret = twl_i2c_read_u8(mod_no, &val, reg);
 112         if (ret)
 113                 return ret;
 114
 115         val &= ~clear;
 116         val |= set;
 117
 118         return twl_i2c_write_u8(mod_no, val, reg);
 119 }
 120
 121 static int twl4030_bci_read(u8 reg, u8 *val)
 122 {
 123         return twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, val, reg);
 124 }
 125
 126 static int twl4030_clear_set_boot_bci(u8 clear, u8 set)
 127 {
 128         return twl4030_clear_set(TWL_MODULE_PM_MASTER, clear,
 129                         TWL4030_CONFIG_DONE | TWL4030_BCIAUTOWEN | set,
 130                         TWL4030_PM_MASTER_BOOT_BCI);
 131 }
 132
 133 static int twl4030bci_read_adc_val(u8 reg)
 134 {
 135         int ret, temp;
 136         u8 val;
 137
 138         /* read MSB */
 139         ret = twl4030_bci_read(reg + 1, &val);
 140         if (ret)
 141                 return ret;
 142
 143         temp = (int)(val & 0x03) << 8;
 144
 145         /* read LSB */
 146         ret = twl4030_bci_read(reg, &val);
 147         if (ret)
 148                 return ret;
 149
 150         return temp | val;
 151 }
 152
 153 /*
 154  * Check if Battery Pack was present
 155  */
 156 static int twl4030_is_battery_present(struct twl4030_bci *bci)
 157 {
 158         int ret;
 159         u8 val = 0;
 160
 161         /* Battery presence in Main charge? */
 162         ret = twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, &val, TWL4030_BCIMFSTS3);
 163         if (ret)
 164                 return ret;
 165         if (val & TWL4030_BATSTSMCHG)
 166                 return 0;
 167
 168         /*
 169          * OK, It could be that bootloader did not enable main charger,
 170          * pre-charge is h/w auto. So, Battery presence in Pre-charge?
 171          */
 172         ret = twl_i2c_read_u8(TWL4030_MODULE_PRECHARGE, &val,
 173                               TWL4030_BCIMFSTS1);
 174         if (ret)
 175                 return ret;
 176         if (val & TWL4030_BATSTSPCHG)
 177                 return 0;
 178
 179         return -ENODEV;
 180 }
 181
 182 /*
 183  * Check if VBUS power is present
 184  */
 185 static int twl4030_bci_have_vbus(struct twl4030_bci *bci)
 186 {
 187         int ret;
 188         u8 hwsts;
 189
 190         ret = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &hwsts,
 191                               TWL4030_PM_MASTER_STS_HW_CONDITIONS);
 192         if (ret < 0)
 193                 return 0;
 194
 195         dev_dbg(bci->dev, "check_vbus: HW_CONDITIONS %02x\n", hwsts);
 196
 197         /* in case we also have STS_USB_ID, VBUS is driven by TWL itself */
 198         if ((hwsts & TWL4030_STS_VBUS) && !(hwsts & TWL4030_STS_USB_ID))
 199                 return 1;
 200
 201         return 0;
 202 }
 203
 204 /*
 205  * Enable/Disable USB Charge functionality.
 206  */
 207 static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
 208 {
 209         int ret;
 210
 211         if (enable) {
 212                 /* Check for USB charger connected */
 213                 if (!twl4030_bci_have_vbus(bci))
 214                         return -ENODEV;
 215
 216                 /*
 217                  * Until we can find out what current the device can provide,
 218                  * require a module param to enable USB charging.
 219                  */
 220                 if (!allow_usb) {
 221                         dev_warn(bci->dev, "USB charging is disabled.\n");
 222                         return -EACCES;
 223                 }
 224
 225                 /* Need to keep regulator on */
 226                 if (!bci->usb_enabled) {
 227                         ret = regulator_enable(bci->usb_reg);
 228                         if (ret) {
 229                                 dev_err(bci->dev,
 230                                         "Failed to enable regulator\n");
 231                                 return ret;
 232                         }
 233                         bci->usb_enabled = 1;
 234                 }
 235
 236                 /* forcing the field BCIAUTOUSB (BOOT_BCI[1]) to 1 */
 237                 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOUSB);
 238                 if (ret < 0)
 239                         return ret;
 240
 241                 /* forcing USBFASTMCHG(BCIMFSTS4[2]) to 1 */
 242                 ret = twl4030_clear_set(TWL_MODULE_MAIN_CHARGE, 0,
 243                         TWL4030_USBFASTMCHG, TWL4030_BCIMFSTS4);
 244         } else {
 245                 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOUSB, 0);
 246                 if (bci->usb_enabled) {
 247                         regulator_disable(bci->usb_reg);
 248                         bci->usb_enabled = 0;
 249                 }
 250         }
 251
 252         return ret;
 253 }
 254
 255 /*
 256  * Enable/Disable AC Charge funtionality.
 257  */
 258 static int twl4030_charger_enable_ac(bool enable)
 259 {
 260         int ret;
 261
 262         if (enable)
 263                 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOAC);
 264         else
 265                 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC, 0);
 266
 267         return ret;
 268 }
 269
 270 /*
 271  * Enable/Disable charging of Backup Battery.
 272  */
 273 static int twl4030_charger_enable_backup(int uvolt, int uamp)
 274 {
 275         int ret;
 276         u8 flags;
 277
 278         if (uvolt < 2500000 ||
 279             uamp < 25) {
 280                 /* disable charging of backup battery */
 281                 ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER,
 282                                         TWL4030_BBCHEN, 0, TWL4030_BB_CFG);
 283                 return ret;
 284         }
 285
 286         flags = TWL4030_BBCHEN;
 287         if (uvolt >= 3200000)
 288                 flags |= TWL4030_BBSEL_3V2;
 289         else if (uvolt >= 3100000)
 290                 flags |= TWL4030_BBSEL_3V1;
 291         else if (uvolt >= 3000000)
 292                 flags |= TWL4030_BBSEL_3V0;
 293         else
 294                 flags |= TWL4030_BBSEL_2V5;
 295
 296         if (uamp >= 1000)
 297                 flags |= TWL4030_BBISEL_1000uA;
 298         else if (uamp >= 500)
 299                 flags |= TWL4030_BBISEL_500uA;
 300         else if (uamp >= 150)
 301                 flags |= TWL4030_BBISEL_150uA;
 302         else
 303                 flags |= TWL4030_BBISEL_25uA;
 304
 305         ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER,
 306                                 TWL4030_BBSEL_MASK | TWL4030_BBISEL_MASK,
 307                                 flags,
 308                                 TWL4030_BB_CFG);
 309
 310         return ret;
 311 }
 312
 313 /*
 314  * TWL4030 CHG_PRES (AC charger presence) events
 315  */
 316 static irqreturn_t twl4030_charger_interrupt(int irq, void *arg)
 317 {
 318         struct twl4030_bci *bci = arg;
 319
 320         dev_dbg(bci->dev, "CHG_PRES irq\n");
 321         power_supply_changed(&bci->ac);
 322         power_supply_changed(&bci->usb);
 323
 324         return IRQ_HANDLED;
 325 }
 326
 327 /*
 328  * TWL4030 BCI monitoring events
 329  */
 330 static irqreturn_t twl4030_bci_interrupt(int irq, void *arg)
 331 {
 332         struct twl4030_bci *bci = arg;
 333         u8 irqs1, irqs2;
 334         int ret;
 335
 336         ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs1,
 337                               TWL4030_INTERRUPTS_BCIISR1A);
 338         if (ret < 0)
 339                 return IRQ_HANDLED;
 340
 341         ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs2,
 342                               TWL4030_INTERRUPTS_BCIISR2A);
 343         if (ret < 0)
 344                 return IRQ_HANDLED;
 345
 346         dev_dbg(bci->dev, "BCI irq %02x %02x\n", irqs2, irqs1);
 347
 348         if (irqs1 & (TWL4030_ICHGLOW | TWL4030_ICHGEOC)) {
 349                 /* charger state change, inform the core */
 350                 power_supply_changed(&bci->ac);
 351                 power_supply_changed(&bci->usb);
 352         }
 353
 354         /* various monitoring events, for now we just log them here */
 355         if (irqs1 & (TWL4030_TBATOR2 | TWL4030_TBATOR1))
 356                 dev_warn(bci->dev, "battery temperature out of range\n");
 357
 358         if (irqs1 & TWL4030_BATSTS)
 359                 dev_crit(bci->dev, "battery disconnected\n");
 360
 361         if (irqs2 & TWL4030_VBATOV)
 362                 dev_crit(bci->dev, "VBAT overvoltage\n");
 363
 364         if (irqs2 & TWL4030_VBUSOV)
 365                 dev_crit(bci->dev, "VBUS overvoltage\n");
 366
 367         if (irqs2 & TWL4030_ACCHGOV)
 368                 dev_crit(bci->dev, "Ac charger overvoltage\n");
 369
 370         return IRQ_HANDLED;
 371 }
 372
 373 static void twl4030_bci_usb_work(struct work_struct *data)
 374 {
 375         struct twl4030_bci *bci = container_of(data, struct twl4030_bci, work);
 376
 377         switch (bci->event) {
 378         case USB_EVENT_VBUS:
 379         case USB_EVENT_CHARGER:
 380                 twl4030_charger_enable_usb(bci, true);
 381                 break;
 382         case USB_EVENT_NONE:
 383                 twl4030_charger_enable_usb(bci, false);
 384                 break;
 385         }
 386 }
 387
 388 static int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val,
 389                                void *priv)
 390 {
 391         struct twl4030_bci *bci = container_of(nb, struct twl4030_bci, usb_nb);
 392
 393         dev_dbg(bci->dev, "OTG notify %lu\n", val);
 394
 395         bci->event = val;
 396         schedule_work(&bci->work);
 397
 398         return NOTIFY_OK;
 399 }
 400
 401 /*
 402  * TI provided formulas:
 403  * CGAIN == 0: ICHG = (BCIICHG * 1.7) / (2^10 - 1) - 0.85
 404  * CGAIN == 1: ICHG = (BCIICHG * 3.4) / (2^10 - 1) - 1.7
 405  * Here we use integer approximation of:
 406  * CGAIN == 0: val * 1.6618 - 0.85
 407  * CGAIN == 1: (val * 1.6618 - 0.85) * 2
 408  */
 409 static int twl4030_charger_get_current(void)
 410 {
 411         int curr;
 412         int ret;
 413         u8 bcictl1;
 414
 415         curr = twl4030bci_read_adc_val(TWL4030_BCIICHG);
 416         if (curr < 0)
 417                 return curr;
 418
 419         ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
 420         if (ret)
 421                 return ret;
 422
 423         ret = (curr * 16618 - 850 * 10000) / 10;
 424         if (bcictl1 & TWL4030_CGAIN)
 425                 ret *= 2;
 426
 427         return ret;
 428 }
 429
 430 /*
 431  * Returns the main charge FSM state
 432  * Or < 0 on failure.
 433  */
 434 static int twl4030bci_state(struct twl4030_bci *bci)
 435 {
 436         int ret;
 437         u8 state;
 438
 439         ret = twl4030_bci_read(TWL4030_BCIMSTATEC, &state);
 440         if (ret) {
 441                 pr_err("twl4030_bci: error reading BCIMSTATEC\n");
 442                 return ret;
 443         }
 444
 445         dev_dbg(bci->dev, "state: %02x\n", state);
 446
 447         return state;
 448 }
 449
 450 static int twl4030_bci_state_to_status(int state)
 451 {
 452         state &= TWL4030_MSTATEC_MASK;
 453         if (TWL4030_MSTATEC_QUICK1 <= state && state <= TWL4030_MSTATEC_QUICK7)
 454                 return POWER_SUPPLY_STATUS_CHARGING;
 455         else if (TWL4030_MSTATEC_COMPLETE1 <= state &&
 456                                         state <= TWL4030_MSTATEC_COMPLETE4)
 457                 return POWER_SUPPLY_STATUS_FULL;
 458         else
 459                 return POWER_SUPPLY_STATUS_NOT_CHARGING;
 460 }
 461
 462 static int twl4030_bci_get_property(struct power_supply *psy,
 463                                     enum power_supply_property psp,
 464                                     union power_supply_propval *val)
 465 {
 466         struct twl4030_bci *bci = dev_get_drvdata(psy->dev->parent);
 467         int is_charging;
 468         int state;
 469         int ret;
 470
 471         state = twl4030bci_state(bci);
 472         if (state < 0)
 473                 return state;
 474
 475         if (psy->type == POWER_SUPPLY_TYPE_USB)
 476                 is_charging = state & TWL4030_MSTATEC_USB;
 477         else
 478                 is_charging = state & TWL4030_MSTATEC_AC;
 479
 480         switch (psp) {
 481         case POWER_SUPPLY_PROP_STATUS:
 482                 if (is_charging)
 483                         val->intval = twl4030_bci_state_to_status(state);
 484                 else
 485                         val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
 486                 break;
 487         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 488                 /* charging must be active for meaningful result */
 489                 if (!is_charging)
 490                         return -ENODATA;
 491                 if (psy->type == POWER_SUPPLY_TYPE_USB) {
 492                         ret = twl4030bci_read_adc_val(TWL4030_BCIVBUS);
 493                         if (ret < 0)
 494                                 return ret;
 495                         /* BCIVBUS uses ADCIN8, 7/1023 V/step */
 496                         val->intval = ret * 6843;
 497                 } else {
 498                         ret = twl4030bci_read_adc_val(TWL4030_BCIVAC);
 499                         if (ret < 0)
 500                                 return ret;
 501                         /* BCIVAC uses ADCIN11, 10/1023 V/step */
 502                         val->intval = ret * 9775;
 503                 }
 504                 break;
 505         case POWER_SUPPLY_PROP_CURRENT_NOW:
 506                 if (!is_charging)
 507                         return -ENODATA;
 508                 /* current measurement is shared between AC and USB */
 509                 ret = twl4030_charger_get_current();
 510                 if (ret < 0)
 511                         return ret;
 512                 val->intval = ret;
 513                 break;
 514         case POWER_SUPPLY_PROP_ONLINE:
 515                 val->intval = is_charging &&
 516                         twl4030_bci_state_to_status(state) !=
 517                                 POWER_SUPPLY_STATUS_NOT_CHARGING;
 518                 break;
 519         default:
 520                 return -EINVAL;
 521         }
 522
 523         return 0;
 524 }
 525
 526 static enum power_supply_property twl4030_charger_props[] = {
 527         POWER_SUPPLY_PROP_STATUS,
 528         POWER_SUPPLY_PROP_ONLINE,
 529         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 530         POWER_SUPPLY_PROP_CURRENT_NOW,
 531 };
 532
 533 #ifdef CONFIG_OF
 534 static const struct twl4030_bci_platform_data *
 535 twl4030_bci_parse_dt(struct device *dev)
 536 {
 537         struct device_node *np = dev->of_node;
 538         struct twl4030_bci_platform_data *pdata;
 539         u32 num;
 540
 541         if (!np)
 542                 return NULL;
 543         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 544         if (!pdata)
 545                 return pdata;
 546
 547         if (of_property_read_u32(np, "ti,bb-uvolt", &num) == 0)
 548                 pdata->bb_uvolt = num;
 549         if (of_property_read_u32(np, "ti,bb-uamp", &num) == 0)
 550                 pdata->bb_uamp = num;
 551         return pdata;
 552 }
 553 #else
 554 static inline const struct twl4030_bci_platform_data *
 555 twl4030_bci_parse_dt(struct device *dev)
 556 {
 557         return NULL;
 558 }
 559 #endif
 560
 561 static int __init twl4030_bci_probe(struct platform_device *pdev)
 562 {
 563         struct twl4030_bci *bci;
 564         const struct twl4030_bci_platform_data *pdata = pdev->dev.platform_data;
 565         int ret;
 566         u32 reg;
 567
 568         bci = kzalloc(sizeof(*bci), GFP_KERNEL);
 569         if (bci == NULL)
 570                 return -ENOMEM;
 571
 572         if (!pdata)
 573                 pdata = twl4030_bci_parse_dt(&pdev->dev);
 574
 575         bci->dev = &pdev->dev;
 576         bci->irq_chg = platform_get_irq(pdev, 0);
 577         bci->irq_bci = platform_get_irq(pdev, 1);
 578
 579         /* Only proceed further *IF* battery is physically present */
 580         ret = twl4030_is_battery_present(bci);
 581         if  (ret) {
 582                 dev_crit(&pdev->dev, "Battery was not detected:%d\n", ret);
 583                 goto fail_no_battery;
 584         }
 585
 586         platform_set_drvdata(pdev, bci);
 587         bci->ac.name = "twl4030_ac";
 588         bci->ac.type = POWER_SUPPLY_TYPE_MAINS;
 589         bci->ac.properties = twl4030_charger_props;
 590         bci->ac.num_properties = ARRAY_SIZE(twl4030_charger_props);
 591         bci->ac.get_property = twl4030_bci_get_property;
 592
 593         ret = power_supply_register(&pdev->dev, &bci->ac);
 594         if (ret) {
 595                 dev_err(&pdev->dev, "failed to register ac: %d\n", ret);
 596                 goto fail_register_ac;
 597         }
 598
 599         bci->usb.name = "twl4030_usb";
 600         bci->usb.type = POWER_SUPPLY_TYPE_USB;
 601         bci->usb.properties = twl4030_charger_props;
 602         bci->usb.num_properties = ARRAY_SIZE(twl4030_charger_props);
 603         bci->usb.get_property = twl4030_bci_get_property;
 604
 605         bci->usb_reg = regulator_get(bci->dev, "bci3v1");
 606
 607         ret = power_supply_register(&pdev->dev, &bci->usb);
 608         if (ret) {
 609                 dev_err(&pdev->dev, "failed to register usb: %d\n", ret);
 610                 goto fail_register_usb;
 611         }
 612
 613         ret = request_threaded_irq(bci->irq_chg, NULL,
 614                         twl4030_charger_interrupt, IRQF_ONESHOT, pdev->name,
 615                         bci);
 616         if (ret < 0) {
 617                 dev_err(&pdev->dev, "could not request irq %d, status %d\n",
 618                         bci->irq_chg, ret);
 619                 goto fail_chg_irq;
 620         }
 621
 622         ret = request_threaded_irq(bci->irq_bci, NULL,
 623                         twl4030_bci_interrupt, IRQF_ONESHOT, pdev->name, bci);
 624         if (ret < 0) {
 625                 dev_err(&pdev->dev, "could not request irq %d, status %d\n",
 626                         bci->irq_bci, ret);
 627                 goto fail_bci_irq;
 628         }
 629
 630         INIT_WORK(&bci->work, twl4030_bci_usb_work);
 631
 632         bci->transceiver = usb_get_phy(USB_PHY_TYPE_USB2);
 633         if (!IS_ERR_OR_NULL(bci->transceiver)) {
 634                 bci->usb_nb.notifier_call = twl4030_bci_usb_ncb;
 635                 usb_register_notifier(bci->transceiver, &bci->usb_nb);
 636         }
 637
 638         /* Enable interrupts now. */
 639         reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_ICHGEOC | TWL4030_TBATOR2 |
 640                 TWL4030_TBATOR1 | TWL4030_BATSTS);
 641         ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
 642                                TWL4030_INTERRUPTS_BCIIMR1A);
 643         if (ret < 0) {
 644                 dev_err(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
 645                 goto fail_unmask_interrupts;
 646         }
 647
 648         reg = ~(u32)(TWL4030_VBATOV | TWL4030_VBUSOV | TWL4030_ACCHGOV);
 649         ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
 650                                TWL4030_INTERRUPTS_BCIIMR2A);
 651         if (ret < 0)
 652                 dev_warn(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
 653
 654         twl4030_charger_enable_ac(true);
 655         twl4030_charger_enable_usb(bci, true);
 656         if (pdata)
 657                 twl4030_charger_enable_backup(pdata->bb_uvolt,
 658                                               pdata->bb_uamp);
 659         else
 660                 twl4030_charger_enable_backup(0, 0);
 661
 662         return 0;
 663
 664 fail_unmask_interrupts:
 665         if (!IS_ERR_OR_NULL(bci->transceiver)) {
 666                 usb_unregister_notifier(bci->transceiver, &bci->usb_nb);
 667                 usb_put_phy(bci->transceiver);
 668         }
 669         free_irq(bci->irq_bci, bci);
 670 fail_bci_irq:
 671         free_irq(bci->irq_chg, bci);
 672 fail_chg_irq:
 673         power_supply_unregister(&bci->usb);
 674 fail_register_usb:
 675         power_supply_unregister(&bci->ac);
 676 fail_register_ac:
 677 fail_no_battery:
 678         kfree(bci);
 679
 680         return ret;
 681 }
 682
 683 static int __exit twl4030_bci_remove(struct platform_device *pdev)
 684 {
 685         struct twl4030_bci *bci = platform_get_drvdata(pdev);
 686
 687         twl4030_charger_enable_ac(false);
 688         twl4030_charger_enable_usb(bci, false);
 689         twl4030_charger_enable_backup(0, 0);
 690
 691         /* mask interrupts */
 692         twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
 693                          TWL4030_INTERRUPTS_BCIIMR1A);
 694         twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
 695                          TWL4030_INTERRUPTS_BCIIMR2A);
 696
 697         if (!IS_ERR_OR_NULL(bci->transceiver)) {
 698                 usb_unregister_notifier(bci->transceiver, &bci->usb_nb);
 699                 usb_put_phy(bci->transceiver);
 700         }
 701         free_irq(bci->irq_bci, bci);
 702         free_irq(bci->irq_chg, bci);
 703         power_supply_unregister(&bci->usb);
 704         power_supply_unregister(&bci->ac);
 705         kfree(bci);
 706
 707         return 0;
 708 }
 709
 710 static const struct of_device_id twl_bci_of_match[] = {
 711         {.compatible = "ti,twl4030-bci", },
 712         { }
 713 };
 714 MODULE_DEVICE_TABLE(of, twl_bci_of_match);
 715
 716 static struct platform_driver twl4030_bci_driver = {
 717         .driver = {
 718                 .name   = "twl4030_bci",
 719                 .of_match_table = of_match_ptr(twl_bci_of_match),
 720         },
 721         .remove = __exit_p(twl4030_bci_remove),
 722 };
 723
 724 module_platform_driver_probe(twl4030_bci_driver, twl4030_bci_probe);
 725
 726 MODULE_AUTHOR("Gražvydas Ignotas");
 727 MODULE_DESCRIPTION("TWL4030 Battery Charger Interface driver");
 728 MODULE_LICENSE("GPL");
 729 MODULE_ALIAS("platform:twl4030_bci");