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/iio/consumer.h>
  26
  27 #define TWL4030_BCIMDEN         0x00
  28 #define TWL4030_BCIMDKEY        0x01
  29 #define TWL4030_BCIMSTATEC      0x02
  30 #define TWL4030_BCIICHG         0x08
  31 #define TWL4030_BCIVAC          0x0a
  32 #define TWL4030_BCIVBUS         0x0c
  33 #define TWL4030_BCIMFSTS3       0x0F
  34 #define TWL4030_BCIMFSTS4       0x10
  35 #define TWL4030_BCICTL1         0x23
  36 #define TWL4030_BB_CFG          0x12
  37 #define TWL4030_BCIIREF1        0x27
  38 #define TWL4030_BCIIREF2        0x28
  39 #define TWL4030_BCIMFKEY        0x11
  40 #define TWL4030_BCIMFEN3        0x14
  41 #define TWL4030_BCIMFTH8        0x1d
  42 #define TWL4030_BCIMFTH9        0x1e
  43 #define TWL4030_BCIWDKEY        0x21
  44
  45 #define TWL4030_BCIMFSTS1       0x01
  46
  47 #define TWL4030_BCIAUTOWEN      BIT(5)
  48 #define TWL4030_CONFIG_DONE     BIT(4)
  49 #define TWL4030_CVENAC          BIT(2)
  50 #define TWL4030_BCIAUTOUSB      BIT(1)
  51 #define TWL4030_BCIAUTOAC       BIT(0)
  52 #define TWL4030_CGAIN           BIT(5)
  53 #define TWL4030_USBFASTMCHG     BIT(2)
  54 #define TWL4030_STS_VBUS        BIT(7)
  55 #define TWL4030_STS_USB_ID      BIT(2)
  56 #define TWL4030_BBCHEN          BIT(4)
  57 #define TWL4030_BBSEL_MASK      0x0c
  58 #define TWL4030_BBSEL_2V5       0x00
  59 #define TWL4030_BBSEL_3V0       0x04
  60 #define TWL4030_BBSEL_3V1       0x08
  61 #define TWL4030_BBSEL_3V2       0x0c
  62 #define TWL4030_BBISEL_MASK     0x03
  63 #define TWL4030_BBISEL_25uA     0x00
  64 #define TWL4030_BBISEL_150uA    0x01
  65 #define TWL4030_BBISEL_500uA    0x02
  66 #define TWL4030_BBISEL_1000uA   0x03
  67
  68 #define TWL4030_BATSTSPCHG      BIT(2)
  69 #define TWL4030_BATSTSMCHG      BIT(6)
  70
  71 /* BCI interrupts */
  72 #define TWL4030_WOVF            BIT(0) /* Watchdog overflow */
  73 #define TWL4030_TMOVF           BIT(1) /* Timer overflow */
  74 #define TWL4030_ICHGHIGH        BIT(2) /* Battery charge current high */
  75 #define TWL4030_ICHGLOW         BIT(3) /* Battery cc. low / FSM state change */
  76 #define TWL4030_ICHGEOC         BIT(4) /* Battery current end-of-charge */
  77 #define TWL4030_TBATOR2         BIT(5) /* Battery temperature out of range 2 */
  78 #define TWL4030_TBATOR1         BIT(6) /* Battery temperature out of range 1 */
  79 #define TWL4030_BATSTS          BIT(7) /* Battery status */
  80
  81 #define TWL4030_VBATLVL         BIT(0) /* VBAT level */
  82 #define TWL4030_VBATOV          BIT(1) /* VBAT overvoltage */
  83 #define TWL4030_VBUSOV          BIT(2) /* VBUS overvoltage */
  84 #define TWL4030_ACCHGOV         BIT(3) /* Ac charger overvoltage */
  85
  86 #define TWL4030_MSTATEC_USB             BIT(4)
  87 #define TWL4030_MSTATEC_AC              BIT(5)
  88 #define TWL4030_MSTATEC_MASK            0x0f
  89 #define TWL4030_MSTATEC_QUICK1          0x02
  90 #define TWL4030_MSTATEC_QUICK7          0x07
  91 #define TWL4030_MSTATEC_COMPLETE1       0x0b
  92 #define TWL4030_MSTATEC_COMPLETE4       0x0e
  93
  94 /*
  95  * If AC (Accessory Charger) voltage exceeds 4.5V (MADC 11)
  96  * then AC is available.
  97  */
  98 static inline int ac_available(struct iio_channel *channel_vac)
  99 {
 100         int val, err;
 101
 102         if (!channel_vac)
 103                 return 0;
 104
 105         err = iio_read_channel_processed(channel_vac, &val);
 106         if (err < 0)
 107                 return 0;
 108         return val > 4500;
 109 }
 110
 111 static bool allow_usb;
 112 module_param(allow_usb, bool, 0644);
 113 MODULE_PARM_DESC(allow_usb, "Allow USB charge drawing default current");
 114
 115 struct twl4030_bci {
 116         struct device           *dev;
 117         struct power_supply     *ac;
 118         struct power_supply     *usb;
 119         struct usb_phy          *transceiver;
 120         struct notifier_block   usb_nb;
 121         struct work_struct      work;
 122         int                     irq_chg;
 123         int                     irq_bci;
 124         int                     usb_enabled;
 125
 126         /*
 127          * ichg_* and *_cur values in uA. If any are 'large', we set
 128          * CGAIN to '1' which doubles the range for half the
 129          * precision.
 130          */
 131         unsigned int            ichg_eoc, ichg_lo, ichg_hi;
 132         unsigned int            usb_cur, ac_cur;
 133         struct iio_channel      *channel_vac;
 134         bool                    ac_is_active;
 135         int                     usb_mode, ac_mode; /* charging mode requested */
 136 #define CHARGE_OFF      0
 137 #define CHARGE_AUTO     1
 138 #define CHARGE_LINEAR   2
 139
 140         /* When setting the USB current we slowly increase the
 141          * requested current until target is reached or the voltage
 142          * drops below 4.75V.  In the latter case we step back one
 143          * step.
 144          */
 145         unsigned int            usb_cur_target;
 146         struct delayed_work     current_worker;
 147 #define USB_CUR_STEP    20000   /* 20mA at a time */
 148 #define USB_MIN_VOLT    4750000 /* 4.75V */
 149 #define USB_CUR_DELAY   msecs_to_jiffies(100)
 150 #define USB_MAX_CURRENT 1700000 /* TWL4030 caps at 1.7A */
 151
 152         unsigned long           event;
 153 };
 154
 155 /* strings for 'usb_mode' values */
 156 static char *modes[] = { "off", "auto", "continuous" };
 157
 158 /*
 159  * clear and set bits on an given register on a given module
 160  */
 161 static int twl4030_clear_set(u8 mod_no, u8 clear, u8 set, u8 reg)
 162 {
 163         u8 val = 0;
 164         int ret;
 165
 166         ret = twl_i2c_read_u8(mod_no, &val, reg);
 167         if (ret)
 168                 return ret;
 169
 170         val &= ~clear;
 171         val |= set;
 172
 173         return twl_i2c_write_u8(mod_no, val, reg);
 174 }
 175
 176 static int twl4030_bci_read(u8 reg, u8 *val)
 177 {
 178         return twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, val, reg);
 179 }
 180
 181 static int twl4030_clear_set_boot_bci(u8 clear, u8 set)
 182 {
 183         return twl4030_clear_set(TWL_MODULE_PM_MASTER, clear,
 184                         TWL4030_CONFIG_DONE | TWL4030_BCIAUTOWEN | set,
 185                         TWL4030_PM_MASTER_BOOT_BCI);
 186 }
 187
 188 static int twl4030bci_read_adc_val(u8 reg)
 189 {
 190         int ret, temp;
 191         u8 val;
 192
 193         /* read MSB */
 194         ret = twl4030_bci_read(reg + 1, &val);
 195         if (ret)
 196                 return ret;
 197
 198         temp = (int)(val & 0x03) << 8;
 199
 200         /* read LSB */
 201         ret = twl4030_bci_read(reg, &val);
 202         if (ret)
 203                 return ret;
 204
 205         return temp | val;
 206 }
 207
 208 /*
 209  * Check if Battery Pack was present
 210  */
 211 static int twl4030_is_battery_present(struct twl4030_bci *bci)
 212 {
 213         int ret;
 214         u8 val = 0;
 215
 216         /* Battery presence in Main charge? */
 217         ret = twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, &val, TWL4030_BCIMFSTS3);
 218         if (ret)
 219                 return ret;
 220         if (val & TWL4030_BATSTSMCHG)
 221                 return 0;
 222
 223         /*
 224          * OK, It could be that bootloader did not enable main charger,
 225          * pre-charge is h/w auto. So, Battery presence in Pre-charge?
 226          */
 227         ret = twl_i2c_read_u8(TWL4030_MODULE_PRECHARGE, &val,
 228                               TWL4030_BCIMFSTS1);
 229         if (ret)
 230                 return ret;
 231         if (val & TWL4030_BATSTSPCHG)
 232                 return 0;
 233
 234         return -ENODEV;
 235 }
 236
 237 /*
 238  * TI provided formulas:
 239  * CGAIN == 0: ICHG = (BCIICHG * 1.7) / (2^10 - 1) - 0.85
 240  * CGAIN == 1: ICHG = (BCIICHG * 3.4) / (2^10 - 1) - 1.7
 241  * Here we use integer approximation of:
 242  * CGAIN == 0: val * 1.6618 - 0.85 * 1000
 243  * CGAIN == 1: (val * 1.6618 - 0.85 * 1000) * 2
 244  */
 245 /*
 246  * convert twl register value for currents into uA
 247  */
 248 static int regval2ua(int regval, bool cgain)
 249 {
 250         if (cgain)
 251                 return (regval * 16618 - 8500 * 1000) / 5;
 252         else
 253                 return (regval * 16618 - 8500 * 1000) / 10;
 254 }
 255
 256 /*
 257  * convert uA currents into twl register value
 258  */
 259 static int ua2regval(int ua, bool cgain)
 260 {
 261         int ret;
 262         if (cgain)
 263                 ua /= 2;
 264         ret = (ua * 10 + 8500 * 1000) / 16618;
 265         /* rounding problems */
 266         if (ret < 512)
 267                 ret = 512;
 268         return ret;
 269 }
 270
 271 static int twl4030_charger_update_current(struct twl4030_bci *bci)
 272 {
 273         int status;
 274         int cur;
 275         unsigned reg, cur_reg;
 276         u8 bcictl1, oldreg, fullreg;
 277         bool cgain = false;
 278         u8 boot_bci;
 279
 280         /*
 281          * If AC (Accessory Charger) voltage exceeds 4.5V (MADC 11)
 282          * and AC is enabled, set current for 'ac'
 283          */
 284         if (ac_available(bci->channel_vac)) {
 285                 cur = bci->ac_cur;
 286                 bci->ac_is_active = true;
 287         } else {
 288                 cur = bci->usb_cur;
 289                 bci->ac_is_active = false;
 290                 if (cur > bci->usb_cur_target) {
 291                         cur = bci->usb_cur_target;
 292                         bci->usb_cur = cur;
 293                 }
 294                 if (cur < bci->usb_cur_target)
 295                         schedule_delayed_work(&bci->current_worker, USB_CUR_DELAY);
 296         }
 297
 298         /* First, check thresholds and see if cgain is needed */
 299         if (bci->ichg_eoc >= 200000)
 300                 cgain = true;
 301         if (bci->ichg_lo >= 400000)
 302                 cgain = true;
 303         if (bci->ichg_hi >= 820000)
 304                 cgain = true;
 305         if (cur > 852000)
 306                 cgain = true;
 307
 308         status = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
 309         if (status < 0)
 310                 return status;
 311         if (twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &boot_bci,
 312                             TWL4030_PM_MASTER_BOOT_BCI) < 0)
 313                 boot_bci = 0;
 314         boot_bci &= 7;
 315
 316         if ((!!cgain) != !!(bcictl1 & TWL4030_CGAIN))
 317                 /* Need to turn for charging while we change the
 318                  * CGAIN bit.  Leave it off while everything is
 319                  * updated.
 320                  */
 321                 twl4030_clear_set_boot_bci(boot_bci, 0);
 322
 323         /*
 324          * For ichg_eoc, the hardware only supports reg values matching
 325          * 100XXXX000, and requires the XXXX be stored in the high nibble
 326          * of TWL4030_BCIMFTH8.
 327          */
 328         reg = ua2regval(bci->ichg_eoc, cgain);
 329         if (reg > 0x278)
 330                 reg = 0x278;
 331         if (reg < 0x200)
 332                 reg = 0x200;
 333         reg = (reg >> 3) & 0xf;
 334         fullreg = reg << 4;
 335
 336         /*
 337          * For ichg_lo, reg value must match 10XXXX0000.
 338          * XXXX is stored in low nibble of TWL4030_BCIMFTH8.
 339          */
 340         reg = ua2regval(bci->ichg_lo, cgain);
 341         if (reg > 0x2F0)
 342                 reg = 0x2F0;
 343         if (reg < 0x200)
 344                 reg = 0x200;
 345         reg = (reg >> 4) & 0xf;
 346         fullreg |= reg;
 347
 348         /* ichg_eoc and ichg_lo live in same register */
 349         status = twl4030_bci_read(TWL4030_BCIMFTH8, &oldreg);
 350         if (status < 0)
 351                 return status;
 352         if (oldreg != fullreg) {
 353                 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xF4,
 354                                           TWL4030_BCIMFKEY);
 355                 if (status < 0)
 356                         return status;
 357                 twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
 358                                  fullreg, TWL4030_BCIMFTH8);
 359         }
 360
 361         /* ichg_hi threshold must be 1XXXX01100 (I think) */
 362         reg = ua2regval(bci->ichg_hi, cgain);
 363         if (reg > 0x3E0)
 364                 reg = 0x3E0;
 365         if (reg < 0x200)
 366                 reg = 0x200;
 367         fullreg = (reg >> 5) & 0xF;
 368         fullreg <<= 4;
 369         status = twl4030_bci_read(TWL4030_BCIMFTH9, &oldreg);
 370         if (status < 0)
 371                 return status;
 372         if ((oldreg & 0xF0) != fullreg) {
 373                 fullreg |= (oldreg & 0x0F);
 374                 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7,
 375                                           TWL4030_BCIMFKEY);
 376                 if (status < 0)
 377                         return status;
 378                 twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
 379                                  fullreg, TWL4030_BCIMFTH9);
 380         }
 381
 382         /*
 383          * And finally, set the current.  This is stored in
 384          * two registers.
 385          */
 386         reg = ua2regval(cur, cgain);
 387         /* we have only 10 bits */
 388         if (reg > 0x3ff)
 389                 reg = 0x3ff;
 390         status = twl4030_bci_read(TWL4030_BCIIREF1, &oldreg);
 391         if (status < 0)
 392                 return status;
 393         cur_reg = oldreg;
 394         status = twl4030_bci_read(TWL4030_BCIIREF2, &oldreg);
 395         if (status < 0)
 396                 return status;
 397         cur_reg |= oldreg << 8;
 398         if (reg != oldreg) {
 399                 /* disable write protection for one write access for
 400                  * BCIIREF */
 401                 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7,
 402                                           TWL4030_BCIMFKEY);
 403                 if (status < 0)
 404                         return status;
 405                 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
 406                                           (reg & 0x100) ? 3 : 2,
 407                                           TWL4030_BCIIREF2);
 408                 if (status < 0)
 409                         return status;
 410                 /* disable write protection for one write access for
 411                  * BCIIREF */
 412                 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7,
 413                                           TWL4030_BCIMFKEY);
 414                 if (status < 0)
 415                         return status;
 416                 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
 417                                           reg & 0xff,
 418                                           TWL4030_BCIIREF1);
 419         }
 420         if ((!!cgain) != !!(bcictl1 & TWL4030_CGAIN)) {
 421                 /* Flip CGAIN and re-enable charging */
 422                 bcictl1 ^= TWL4030_CGAIN;
 423                 twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
 424                                  bcictl1, TWL4030_BCICTL1);
 425                 twl4030_clear_set_boot_bci(0, boot_bci);
 426         }
 427         return 0;
 428 }
 429
 430 static int twl4030_charger_get_current(void);
 431
 432 static void twl4030_current_worker(struct work_struct *data)
 433 {
 434         int v, curr;
 435         int res;
 436         struct twl4030_bci *bci = container_of(data, struct twl4030_bci,
 437                                                current_worker.work);
 438
 439         res = twl4030bci_read_adc_val(TWL4030_BCIVBUS);
 440         if (res < 0)
 441                 v = 0;
 442         else
 443                 /* BCIVBUS uses ADCIN8, 7/1023 V/step */
 444                 v = res * 6843;
 445         curr = twl4030_charger_get_current();
 446
 447         dev_dbg(bci->dev, "v=%d cur=%d limit=%d target=%d\n", v, curr,
 448                 bci->usb_cur, bci->usb_cur_target);
 449
 450         if (v < USB_MIN_VOLT) {
 451                 /* Back up and stop adjusting. */
 452                 if (bci->usb_cur >= USB_CUR_STEP)
 453                         bci->usb_cur -= USB_CUR_STEP;
 454                 bci->usb_cur_target = bci->usb_cur;
 455         } else if (bci->usb_cur >= bci->usb_cur_target ||
 456                    bci->usb_cur + USB_CUR_STEP > USB_MAX_CURRENT) {
 457                 /* Reached target and voltage is OK - stop */
 458                 return;
 459         } else {
 460                 bci->usb_cur += USB_CUR_STEP;
 461                 schedule_delayed_work(&bci->current_worker, USB_CUR_DELAY);
 462         }
 463         twl4030_charger_update_current(bci);
 464 }
 465
 466 /*
 467  * Enable/Disable USB Charge functionality.
 468  */
 469 static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
 470 {
 471         int ret;
 472         u32 reg;
 473
 474         if (bci->usb_mode == CHARGE_OFF)
 475                 enable = false;
 476         if (enable && !IS_ERR_OR_NULL(bci->transceiver)) {
 477
 478                 twl4030_charger_update_current(bci);
 479
 480                 /* Need to keep phy powered */
 481                 if (!bci->usb_enabled) {
 482                         pm_runtime_get_sync(bci->transceiver->dev);
 483                         bci->usb_enabled = 1;
 484                 }
 485
 486                 if (bci->usb_mode == CHARGE_AUTO) {
 487                         /* Enable interrupts now. */
 488                         reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_ICHGEOC |
 489                                         TWL4030_TBATOR2 | TWL4030_TBATOR1 |
 490                                         TWL4030_BATSTS);
 491                         ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
 492                                        TWL4030_INTERRUPTS_BCIIMR1A);
 493                         if (ret < 0) {
 494                                 dev_err(bci->dev,
 495                                         "failed to unmask interrupts: %d\n",
 496                                         ret);
 497                                 return ret;
 498                         }
 499                         /* forcing the field BCIAUTOUSB (BOOT_BCI[1]) to 1 */
 500                         ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOUSB);
 501                 }
 502
 503                 /* forcing USBFASTMCHG(BCIMFSTS4[2]) to 1 */
 504                 ret = twl4030_clear_set(TWL_MODULE_MAIN_CHARGE, 0,
 505                         TWL4030_USBFASTMCHG, TWL4030_BCIMFSTS4);
 506                 if (bci->usb_mode == CHARGE_LINEAR) {
 507                         /* Enable interrupts now. */
 508                         reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_TBATOR2 |
 509                                         TWL4030_TBATOR1 | TWL4030_BATSTS);
 510                         ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
 511                                        TWL4030_INTERRUPTS_BCIIMR1A);
 512                         if (ret < 0) {
 513                                 dev_err(bci->dev,
 514                                         "failed to unmask interrupts: %d\n",
 515                                         ret);
 516                                 return ret;
 517                         }
 518                         twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC|TWL4030_CVENAC, 0);
 519                         /* Watch dog key: WOVF acknowledge */
 520                         ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x33,
 521                                                TWL4030_BCIWDKEY);
 522                         /* 0x24 + EKEY6: off mode */
 523                         ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x2a,
 524                                                TWL4030_BCIMDKEY);
 525                         /* EKEY2: Linear charge: USB path */
 526                         ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x26,
 527                                                TWL4030_BCIMDKEY);
 528                         /* WDKEY5: stop watchdog count */
 529                         ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xf3,
 530                                                TWL4030_BCIWDKEY);
 531                         /* enable MFEN3 access */
 532                         ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x9c,
 533                                                TWL4030_BCIMFKEY);
 534                          /* ICHGEOCEN - end-of-charge monitor (current < 80mA)
 535                           *                      (charging continues)
 536                           * ICHGLOWEN - current level monitor (charge continues)
 537                           * don't monitor over-current or heat save
 538                           */
 539                         ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xf0,
 540                                                TWL4030_BCIMFEN3);
 541                 }
 542         } else {
 543                 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOUSB, 0);
 544                 ret |= twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x2a,
 545                                         TWL4030_BCIMDKEY);
 546                 if (bci->usb_enabled) {
 547                         pm_runtime_mark_last_busy(bci->transceiver->dev);
 548                         pm_runtime_put_autosuspend(bci->transceiver->dev);
 549                         bci->usb_enabled = 0;
 550                 }
 551                 bci->usb_cur = 0;
 552         }
 553
 554         return ret;
 555 }
 556
 557 /*
 558  * Enable/Disable AC Charge funtionality.
 559  */
 560 static int twl4030_charger_enable_ac(struct twl4030_bci *bci, bool enable)
 561 {
 562         int ret;
 563
 564         if (bci->ac_mode == CHARGE_OFF)
 565                 enable = false;
 566
 567         if (enable)
 568                 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOAC);
 569         else
 570                 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC, 0);
 571
 572         return ret;
 573 }
 574
 575 /*
 576  * Enable/Disable charging of Backup Battery.
 577  */
 578 static int twl4030_charger_enable_backup(int uvolt, int uamp)
 579 {
 580         int ret;
 581         u8 flags;
 582
 583         if (uvolt < 2500000 ||
 584             uamp < 25) {
 585                 /* disable charging of backup battery */
 586                 ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER,
 587                                         TWL4030_BBCHEN, 0, TWL4030_BB_CFG);
 588                 return ret;
 589         }
 590
 591         flags = TWL4030_BBCHEN;
 592         if (uvolt >= 3200000)
 593                 flags |= TWL4030_BBSEL_3V2;
 594         else if (uvolt >= 3100000)
 595                 flags |= TWL4030_BBSEL_3V1;
 596         else if (uvolt >= 3000000)
 597                 flags |= TWL4030_BBSEL_3V0;
 598         else
 599                 flags |= TWL4030_BBSEL_2V5;
 600
 601         if (uamp >= 1000)
 602                 flags |= TWL4030_BBISEL_1000uA;
 603         else if (uamp >= 500)
 604                 flags |= TWL4030_BBISEL_500uA;
 605         else if (uamp >= 150)
 606                 flags |= TWL4030_BBISEL_150uA;
 607         else
 608                 flags |= TWL4030_BBISEL_25uA;
 609
 610         ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER,
 611                                 TWL4030_BBSEL_MASK | TWL4030_BBISEL_MASK,
 612                                 flags,
 613                                 TWL4030_BB_CFG);
 614
 615         return ret;
 616 }
 617
 618 /*
 619  * TWL4030 CHG_PRES (AC charger presence) events
 620  */
 621 static irqreturn_t twl4030_charger_interrupt(int irq, void *arg)
 622 {
 623         struct twl4030_bci *bci = arg;
 624
 625         dev_dbg(bci->dev, "CHG_PRES irq\n");
 626         /* reset current on each 'plug' event */
 627         bci->ac_cur = 500000;
 628         twl4030_charger_update_current(bci);
 629         power_supply_changed(bci->ac);
 630         power_supply_changed(bci->usb);
 631
 632         return IRQ_HANDLED;
 633 }
 634
 635 /*
 636  * TWL4030 BCI monitoring events
 637  */
 638 static irqreturn_t twl4030_bci_interrupt(int irq, void *arg)
 639 {
 640         struct twl4030_bci *bci = arg;
 641         u8 irqs1, irqs2;
 642         int ret;
 643
 644         ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs1,
 645                               TWL4030_INTERRUPTS_BCIISR1A);
 646         if (ret < 0)
 647                 return IRQ_HANDLED;
 648
 649         ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs2,
 650                               TWL4030_INTERRUPTS_BCIISR2A);
 651         if (ret < 0)
 652                 return IRQ_HANDLED;
 653
 654         dev_dbg(bci->dev, "BCI irq %02x %02x\n", irqs2, irqs1);
 655
 656         if (irqs1 & (TWL4030_ICHGLOW | TWL4030_ICHGEOC)) {
 657                 /* charger state change, inform the core */
 658                 power_supply_changed(bci->ac);
 659                 power_supply_changed(bci->usb);
 660         }
 661         twl4030_charger_update_current(bci);
 662
 663         /* various monitoring events, for now we just log them here */
 664         if (irqs1 & (TWL4030_TBATOR2 | TWL4030_TBATOR1))
 665                 dev_warn(bci->dev, "battery temperature out of range\n");
 666
 667         if (irqs1 & TWL4030_BATSTS)
 668                 dev_crit(bci->dev, "battery disconnected\n");
 669
 670         if (irqs2 & TWL4030_VBATOV)
 671                 dev_crit(bci->dev, "VBAT overvoltage\n");
 672
 673         if (irqs2 & TWL4030_VBUSOV)
 674                 dev_crit(bci->dev, "VBUS overvoltage\n");
 675
 676         if (irqs2 & TWL4030_ACCHGOV)
 677                 dev_crit(bci->dev, "Ac charger overvoltage\n");
 678
 679         return IRQ_HANDLED;
 680 }
 681
 682 /*
 683  * Provide "max_current" attribute in sysfs.
 684  */
 685 static ssize_t
 686 twl4030_bci_max_current_store(struct device *dev, struct device_attribute *attr,
 687         const char *buf, size_t n)
 688 {
 689         struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
 690         int cur = 0;
 691         int status = 0;
 692         status = kstrtoint(buf, 10, &cur);
 693         if (status)
 694                 return status;
 695         if (cur < 0)
 696                 return -EINVAL;
 697         if (dev == &bci->ac->dev)
 698                 bci->ac_cur = cur;
 699         else
 700                 bci->usb_cur_target = cur;
 701
 702         twl4030_charger_update_current(bci);
 703         return n;
 704 }
 705
 706 /*
 707  * sysfs max_current show
 708  */
 709 static ssize_t twl4030_bci_max_current_show(struct device *dev,
 710         struct device_attribute *attr, char *buf)
 711 {
 712         int status = 0;
 713         int cur = -1;
 714         u8 bcictl1;
 715         struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
 716
 717         if (dev == &bci->ac->dev) {
 718                 if (!bci->ac_is_active)
 719                         cur = bci->ac_cur;
 720         } else {
 721                 if (bci->ac_is_active)
 722                         cur = bci->usb_cur_target;
 723         }
 724         if (cur < 0) {
 725                 cur = twl4030bci_read_adc_val(TWL4030_BCIIREF1);
 726                 if (cur < 0)
 727                         return cur;
 728                 status = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
 729                 if (status < 0)
 730                         return status;
 731                 cur = regval2ua(cur, bcictl1 & TWL4030_CGAIN);
 732         }
 733         return scnprintf(buf, PAGE_SIZE, "%u\n", cur);
 734 }
 735
 736 static DEVICE_ATTR(max_current, 0644, twl4030_bci_max_current_show,
 737                         twl4030_bci_max_current_store);
 738
 739 static void twl4030_bci_usb_work(struct work_struct *data)
 740 {
 741         struct twl4030_bci *bci = container_of(data, struct twl4030_bci, work);
 742
 743         switch (bci->event) {
 744         case USB_EVENT_VBUS:
 745         case USB_EVENT_CHARGER:
 746                 twl4030_charger_enable_usb(bci, true);
 747                 break;
 748         case USB_EVENT_NONE:
 749                 twl4030_charger_enable_usb(bci, false);
 750                 break;
 751         }
 752 }
 753
 754 static int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val,
 755                                void *priv)
 756 {
 757         struct twl4030_bci *bci = container_of(nb, struct twl4030_bci, usb_nb);
 758
 759         dev_dbg(bci->dev, "OTG notify %lu\n", val);
 760
 761         /* reset current on each 'plug' event */
 762         if (allow_usb)
 763                 bci->usb_cur_target = 500000;
 764         else
 765                 bci->usb_cur_target = 100000;
 766
 767         bci->event = val;
 768         schedule_work(&bci->work);
 769
 770         return NOTIFY_OK;
 771 }
 772
 773 /*
 774  * sysfs charger enabled store
 775  */
 776 static ssize_t
 777 twl4030_bci_mode_store(struct device *dev, struct device_attribute *attr,
 778                           const char *buf, size_t n)
 779 {
 780         struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
 781         int mode;
 782         int status;
 783
 784         if (sysfs_streq(buf, modes[0]))
 785                 mode = 0;
 786         else if (sysfs_streq(buf, modes[1]))
 787                 mode = 1;
 788         else if (sysfs_streq(buf, modes[2]))
 789                 mode = 2;
 790         else
 791                 return -EINVAL;
 792         if (dev == &bci->ac->dev) {
 793                 if (mode == 2)
 794                         return -EINVAL;
 795                 twl4030_charger_enable_ac(bci, false);
 796                 bci->ac_mode = mode;
 797                 status = twl4030_charger_enable_ac(bci, true);
 798         } else {
 799                 twl4030_charger_enable_usb(bci, false);
 800                 bci->usb_mode = mode;
 801                 status = twl4030_charger_enable_usb(bci, true);
 802         }
 803         return (status == 0) ? n : status;
 804 }
 805
 806 /*
 807  * sysfs charger enabled show
 808  */
 809 static ssize_t
 810 twl4030_bci_mode_show(struct device *dev,
 811                              struct device_attribute *attr, char *buf)
 812 {
 813         struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
 814         int len = 0;
 815         int i;
 816         int mode = bci->usb_mode;
 817
 818         if (dev == &bci->ac->dev)
 819                 mode = bci->ac_mode;
 820
 821         for (i = 0; i < ARRAY_SIZE(modes); i++)
 822                 if (mode == i)
 823                         len += snprintf(buf+len, PAGE_SIZE-len,
 824                                         "[%s] ", modes[i]);
 825                 else
 826                         len += snprintf(buf+len, PAGE_SIZE-len,
 827                                         "%s ", modes[i]);
 828         buf[len-1] = '\n';
 829         return len;
 830 }
 831 static DEVICE_ATTR(mode, 0644, twl4030_bci_mode_show,
 832                    twl4030_bci_mode_store);
 833
 834 static int twl4030_charger_get_current(void)
 835 {
 836         int curr;
 837         int ret;
 838         u8 bcictl1;
 839
 840         curr = twl4030bci_read_adc_val(TWL4030_BCIICHG);
 841         if (curr < 0)
 842                 return curr;
 843
 844         ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
 845         if (ret)
 846                 return ret;
 847
 848         return regval2ua(curr, bcictl1 & TWL4030_CGAIN);
 849 }
 850
 851 /*
 852  * Returns the main charge FSM state
 853  * Or < 0 on failure.
 854  */
 855 static int twl4030bci_state(struct twl4030_bci *bci)
 856 {
 857         int ret;
 858         u8 state;
 859
 860         ret = twl4030_bci_read(TWL4030_BCIMSTATEC, &state);
 861         if (ret) {
 862                 pr_err("twl4030_bci: error reading BCIMSTATEC\n");
 863                 return ret;
 864         }
 865
 866         dev_dbg(bci->dev, "state: %02x\n", state);
 867
 868         return state;
 869 }
 870
 871 static int twl4030_bci_state_to_status(int state)
 872 {
 873         state &= TWL4030_MSTATEC_MASK;
 874         if (TWL4030_MSTATEC_QUICK1 <= state && state <= TWL4030_MSTATEC_QUICK7)
 875                 return POWER_SUPPLY_STATUS_CHARGING;
 876         else if (TWL4030_MSTATEC_COMPLETE1 <= state &&
 877                                         state <= TWL4030_MSTATEC_COMPLETE4)
 878                 return POWER_SUPPLY_STATUS_FULL;
 879         else
 880                 return POWER_SUPPLY_STATUS_NOT_CHARGING;
 881 }
 882
 883 static int twl4030_bci_get_property(struct power_supply *psy,
 884                                     enum power_supply_property psp,
 885                                     union power_supply_propval *val)
 886 {
 887         struct twl4030_bci *bci = dev_get_drvdata(psy->dev.parent);
 888         int is_charging;
 889         int state;
 890         int ret;
 891
 892         state = twl4030bci_state(bci);
 893         if (state < 0)
 894                 return state;
 895
 896         if (psy->desc->type == POWER_SUPPLY_TYPE_USB)
 897                 is_charging = state & TWL4030_MSTATEC_USB;
 898         else
 899                 is_charging = state & TWL4030_MSTATEC_AC;
 900         if (!is_charging) {
 901                 u8 s;
 902                 twl4030_bci_read(TWL4030_BCIMDEN, &s);
 903                 if (psy->desc->type == POWER_SUPPLY_TYPE_USB)
 904                         is_charging = s & 1;
 905                 else
 906                         is_charging = s & 2;
 907                 if (is_charging)
 908                         /* A little white lie */
 909                         state = TWL4030_MSTATEC_QUICK1;
 910         }
 911
 912         switch (psp) {
 913         case POWER_SUPPLY_PROP_STATUS:
 914                 if (is_charging)
 915                         val->intval = twl4030_bci_state_to_status(state);
 916                 else
 917                         val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
 918                 break;
 919         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 920                 /* charging must be active for meaningful result */
 921                 if (!is_charging)
 922                         return -ENODATA;
 923                 if (psy->desc->type == POWER_SUPPLY_TYPE_USB) {
 924                         ret = twl4030bci_read_adc_val(TWL4030_BCIVBUS);
 925                         if (ret < 0)
 926                                 return ret;
 927                         /* BCIVBUS uses ADCIN8, 7/1023 V/step */
 928                         val->intval = ret * 6843;
 929                 } else {
 930                         ret = twl4030bci_read_adc_val(TWL4030_BCIVAC);
 931                         if (ret < 0)
 932                                 return ret;
 933                         /* BCIVAC uses ADCIN11, 10/1023 V/step */
 934                         val->intval = ret * 9775;
 935                 }
 936                 break;
 937         case POWER_SUPPLY_PROP_CURRENT_NOW:
 938                 if (!is_charging)
 939                         return -ENODATA;
 940                 /* current measurement is shared between AC and USB */
 941                 ret = twl4030_charger_get_current();
 942                 if (ret < 0)
 943                         return ret;
 944                 val->intval = ret;
 945                 break;
 946         case POWER_SUPPLY_PROP_ONLINE:
 947                 val->intval = is_charging &&
 948                         twl4030_bci_state_to_status(state) !=
 949                                 POWER_SUPPLY_STATUS_NOT_CHARGING;
 950                 break;
 951         default:
 952                 return -EINVAL;
 953         }
 954
 955         return 0;
 956 }
 957
 958 static enum power_supply_property twl4030_charger_props[] = {
 959         POWER_SUPPLY_PROP_STATUS,
 960         POWER_SUPPLY_PROP_ONLINE,
 961         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 962         POWER_SUPPLY_PROP_CURRENT_NOW,
 963 };
 964
 965 #ifdef CONFIG_OF
 966 static const struct twl4030_bci_platform_data *
 967 twl4030_bci_parse_dt(struct device *dev)
 968 {
 969         struct device_node *np = dev->of_node;
 970         struct twl4030_bci_platform_data *pdata;
 971         u32 num;
 972
 973         if (!np)
 974                 return NULL;
 975         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 976         if (!pdata)
 977                 return pdata;
 978
 979         if (of_property_read_u32(np, "ti,bb-uvolt", &num) == 0)
 980                 pdata->bb_uvolt = num;
 981         if (of_property_read_u32(np, "ti,bb-uamp", &num) == 0)
 982                 pdata->bb_uamp = num;
 983         return pdata;
 984 }
 985 #else
 986 static inline const struct twl4030_bci_platform_data *
 987 twl4030_bci_parse_dt(struct device *dev)
 988 {
 989         return NULL;
 990 }
 991 #endif
 992
 993 static const struct power_supply_desc twl4030_bci_ac_desc = {
 994         .name           = "twl4030_ac",
 995         .type           = POWER_SUPPLY_TYPE_MAINS,
 996         .properties     = twl4030_charger_props,
 997         .num_properties = ARRAY_SIZE(twl4030_charger_props),
 998         .get_property   = twl4030_bci_get_property,
 999 };
1000
1001 static const struct power_supply_desc twl4030_bci_usb_desc = {
1002         .name           = "twl4030_usb",
1003         .type           = POWER_SUPPLY_TYPE_USB,
1004         .properties     = twl4030_charger_props,
1005         .num_properties = ARRAY_SIZE(twl4030_charger_props),
1006         .get_property   = twl4030_bci_get_property,
1007 };
1008
1009 static int twl4030_bci_probe(struct platform_device *pdev)
1010 {
1011         struct twl4030_bci *bci;
1012         const struct twl4030_bci_platform_data *pdata = pdev->dev.platform_data;
1013         int ret;
1014         u32 reg;
1015
1016         bci = devm_kzalloc(&pdev->dev, sizeof(*bci), GFP_KERNEL);
1017         if (bci == NULL)
1018                 return -ENOMEM;
1019
1020         if (!pdata)
1021                 pdata = twl4030_bci_parse_dt(&pdev->dev);
1022
1023         bci->ichg_eoc = 80100; /* Stop charging when current drops to here */
1024         bci->ichg_lo = 241000; /* Low threshold */
1025         bci->ichg_hi = 500000; /* High threshold */
1026         bci->ac_cur = 500000; /* 500mA */
1027         if (allow_usb)
1028                 bci->usb_cur_target = 500000;  /* 500mA */
1029         else
1030                 bci->usb_cur_target = 100000;  /* 100mA */
1031         bci->usb_mode = CHARGE_AUTO;
1032         bci->ac_mode = CHARGE_AUTO;
1033
1034         bci->dev = &pdev->dev;
1035         bci->irq_chg = platform_get_irq(pdev, 0);
1036         bci->irq_bci = platform_get_irq(pdev, 1);
1037
1038         /* Only proceed further *IF* battery is physically present */
1039         ret = twl4030_is_battery_present(bci);
1040         if  (ret) {
1041                 dev_crit(&pdev->dev, "Battery was not detected:%d\n", ret);
1042                 return ret;
1043         }
1044
1045         platform_set_drvdata(pdev, bci);
1046
1047         bci->ac = devm_power_supply_register(&pdev->dev, &twl4030_bci_ac_desc,
1048                                              NULL);
1049         if (IS_ERR(bci->ac)) {
1050                 ret = PTR_ERR(bci->ac);
1051                 dev_err(&pdev->dev, "failed to register ac: %d\n", ret);
1052                 return ret;
1053         }
1054
1055         bci->usb = devm_power_supply_register(&pdev->dev, &twl4030_bci_usb_desc,
1056                                               NULL);
1057         if (IS_ERR(bci->usb)) {
1058                 ret = PTR_ERR(bci->usb);
1059                 dev_err(&pdev->dev, "failed to register usb: %d\n", ret);
1060                 return ret;
1061         }
1062
1063         ret = devm_request_threaded_irq(&pdev->dev, bci->irq_chg, NULL,
1064                         twl4030_charger_interrupt, IRQF_ONESHOT, pdev->name,
1065                         bci);
1066         if (ret < 0) {
1067                 dev_err(&pdev->dev, "could not request irq %d, status %d\n",
1068                         bci->irq_chg, ret);
1069                 return ret;
1070         }
1071
1072         ret = devm_request_threaded_irq(&pdev->dev, bci->irq_bci, NULL,
1073                         twl4030_bci_interrupt, IRQF_ONESHOT, pdev->name, bci);
1074         if (ret < 0) {
1075                 dev_err(&pdev->dev, "could not request irq %d, status %d\n",
1076                         bci->irq_bci, ret);
1077                 return ret;
1078         }
1079
1080         bci->channel_vac = iio_channel_get(&pdev->dev, "vac");
1081         if (IS_ERR(bci->channel_vac)) {
1082                 bci->channel_vac = NULL;
1083                 dev_warn(&pdev->dev, "could not request vac iio channel");
1084         }
1085
1086         INIT_WORK(&bci->work, twl4030_bci_usb_work);
1087         INIT_DELAYED_WORK(&bci->current_worker, twl4030_current_worker);
1088
1089         bci->usb_nb.notifier_call = twl4030_bci_usb_ncb;
1090         if (bci->dev->of_node) {
1091                 struct device_node *phynode;
1092
1093                 phynode = of_find_compatible_node(bci->dev->of_node->parent,
1094                                                   NULL, "ti,twl4030-usb");
1095                 if (phynode)
1096                         bci->transceiver = devm_usb_get_phy_by_node(
1097                                 bci->dev, phynode, &bci->usb_nb);
1098         }
1099
1100         /* Enable interrupts now. */
1101         reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_ICHGEOC | TWL4030_TBATOR2 |
1102                 TWL4030_TBATOR1 | TWL4030_BATSTS);
1103         ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
1104                                TWL4030_INTERRUPTS_BCIIMR1A);
1105         if (ret < 0) {
1106                 dev_err(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
1107                 goto fail;
1108         }
1109
1110         reg = ~(u32)(TWL4030_VBATOV | TWL4030_VBUSOV | TWL4030_ACCHGOV);
1111         ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
1112                                TWL4030_INTERRUPTS_BCIIMR2A);
1113         if (ret < 0)
1114                 dev_warn(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
1115
1116         twl4030_charger_update_current(bci);
1117         if (device_create_file(&bci->usb->dev, &dev_attr_max_current))
1118                 dev_warn(&pdev->dev, "could not create sysfs file\n");
1119         if (device_create_file(&bci->usb->dev, &dev_attr_mode))
1120                 dev_warn(&pdev->dev, "could not create sysfs file\n");
1121         if (device_create_file(&bci->ac->dev, &dev_attr_mode))
1122                 dev_warn(&pdev->dev, "could not create sysfs file\n");
1123         if (device_create_file(&bci->ac->dev, &dev_attr_max_current))
1124                 dev_warn(&pdev->dev, "could not create sysfs file\n");
1125
1126         twl4030_charger_enable_ac(bci, true);
1127         if (!IS_ERR_OR_NULL(bci->transceiver))
1128                 twl4030_bci_usb_ncb(&bci->usb_nb,
1129                                     bci->transceiver->last_event,
1130                                     NULL);
1131         else
1132                 twl4030_charger_enable_usb(bci, false);
1133         if (pdata)
1134                 twl4030_charger_enable_backup(pdata->bb_uvolt,
1135                                               pdata->bb_uamp);
1136         else
1137                 twl4030_charger_enable_backup(0, 0);
1138
1139         return 0;
1140 fail:
1141         iio_channel_release(bci->channel_vac);
1142
1143         return ret;
1144 }
1145
1146 static int __exit twl4030_bci_remove(struct platform_device *pdev)
1147 {
1148         struct twl4030_bci *bci = platform_get_drvdata(pdev);
1149
1150         twl4030_charger_enable_ac(bci, false);
1151         twl4030_charger_enable_usb(bci, false);
1152         twl4030_charger_enable_backup(0, 0);
1153
1154         iio_channel_release(bci->channel_vac);
1155
1156         device_remove_file(&bci->usb->dev, &dev_attr_max_current);
1157         device_remove_file(&bci->usb->dev, &dev_attr_mode);
1158         device_remove_file(&bci->ac->dev, &dev_attr_max_current);
1159         device_remove_file(&bci->ac->dev, &dev_attr_mode);
1160         /* mask interrupts */
1161         twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
1162                          TWL4030_INTERRUPTS_BCIIMR1A);
1163         twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
1164                          TWL4030_INTERRUPTS_BCIIMR2A);
1165
1166         return 0;
1167 }
1168
1169 static const struct of_device_id twl_bci_of_match[] = {
1170         {.compatible = "ti,twl4030-bci", },
1171         { }
1172 };
1173 MODULE_DEVICE_TABLE(of, twl_bci_of_match);
1174
1175 static struct platform_driver twl4030_bci_driver = {
1176         .probe = twl4030_bci_probe,
1177         .driver = {
1178                 .name   = "twl4030_bci",
1179                 .of_match_table = of_match_ptr(twl_bci_of_match),
1180         },
1181         .remove = __exit_p(twl4030_bci_remove),
1182 };
1183 module_platform_driver(twl4030_bci_driver);
1184
1185 MODULE_AUTHOR("Gražvydas Ignotas");
1186 MODULE_DESCRIPTION("TWL4030 Battery Charger Interface driver");
1187 MODULE_LICENSE("GPL");
1188 MODULE_ALIAS("platform:twl4030_bci");