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/platform_device.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/i2c/twl.h>
  21 #include <linux/power_supply.h>
  22 #include <linux/notifier.h>
  23 #include <linux/usb/otg.h>
  24 #include <linux/ratelimit.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_BCIMFKEY        0x11
  33 #define TWL4030_BCICTL1         0x23
  34 #define TWL4030_BCIIREF1        0x27
  35 #define TWL4030_BCIIREF2        0x28
  36
  37 #define TWL4030_BCIAUTOWEN      BIT(5)
  38 #define TWL4030_CONFIG_DONE     BIT(4)
  39 #define TWL4030_BCIAUTOUSB      BIT(1)
  40 #define TWL4030_BCIAUTOAC       BIT(0)
  41 #define TWL4030_CGAIN           BIT(5)
  42 #define TWL4030_USBFASTMCHG     BIT(2)
  43 #define TWL4030_STS_VBUS        BIT(7)
  44 #define TWL4030_STS_USB_ID      BIT(2)
  45
  46 /* BCI interrupts */
  47 #define TWL4030_WOVF            BIT(0) /* Watchdog overflow */
  48 #define TWL4030_TMOVF           BIT(1) /* Timer overflow */
  49 #define TWL4030_ICHGHIGH        BIT(2) /* Battery charge current high */
  50 #define TWL4030_ICHGLOW         BIT(3) /* Battery cc. low / FSM state change */
  51 #define TWL4030_ICHGEOC         BIT(4) /* Battery current end-of-charge */
  52 #define TWL4030_TBATOR2         BIT(5) /* Battery temperature out of range 2 */
  53 #define TWL4030_TBATOR1         BIT(6) /* Battery temperature out of range 1 */
  54 #define TWL4030_BATSTS          BIT(7) /* Battery status */
  55
  56 #define TWL4030_VBATLVL         BIT(0) /* VBAT level */
  57 #define TWL4030_VBATOV          BIT(1) /* VBAT overvoltage */
  58 #define TWL4030_VBUSOV          BIT(2) /* VBUS overvoltage */
  59 #define TWL4030_ACCHGOV         BIT(3) /* Ac charger overvoltage */
  60
  61 #define TWL4030_MSTATEC_USB             BIT(4)
  62 #define TWL4030_MSTATEC_AC              BIT(5)
  63 #define TWL4030_MSTATEC_MASK            0x0f
  64 #define TWL4030_MSTATEC_QUICK1          0x02
  65 #define TWL4030_MSTATEC_QUICK7          0x07
  66 #define TWL4030_MSTATEC_COMPLETE1       0x0b
  67 #define TWL4030_MSTATEC_COMPLETE4       0x0e
  68
  69 #define TWL4030_KEY_IIREF               0xe7
  70
  71 static bool allow_usb = 1;
  72 module_param(allow_usb, bool, 0644);
  73 MODULE_PARM_DESC(allow_usb, "Allow USB charge drawing default current");
  74
  75 struct twl4030_bci {
  76         struct device           *dev;
  77         struct power_supply     ac;
  78         struct power_supply     usb;
  79         struct otg_transceiver  *transceiver;
  80         struct notifier_block   otg_nb;
  81         struct work_struct      work;
  82         int                     irq_chg;
  83         int                     irq_bci;
  84         bool                    ac_charge_enable;
  85         bool                    usb_charge_enable;
  86         int                     usb_current;
  87         int                     ac_current;
  88         enum power_supply_type  current_supply;
  89         struct regulator        *usb_reg;
  90         int                     usb_enabled;
  91
  92         unsigned long           event;
  93         struct ratelimit_state  ratelimit;
  94 };
  95
  96 /*
  97  * clear and set bits on an given register on a given module
  98  */
  99 static int twl4030_clear_set(u8 mod_no, u8 clear, u8 set, u8 reg)
 100 {
 101         u8 val = 0;
 102         int ret;
 103
 104         ret = twl_i2c_read_u8(mod_no, &val, reg);
 105         if (ret)
 106                 return ret;
 107
 108         val &= ~clear;
 109         val |= set;
 110
 111         return twl_i2c_write_u8(mod_no, val, reg);
 112 }
 113
 114 static int twl4030_bci_read(u8 reg, u8 *val)
 115 {
 116         return twl_i2c_read_u8(TWL4030_MODULE_MAIN_CHARGE, val, reg);
 117 }
 118
 119 static int twl4030_bci_write(u8 reg, u8 val)
 120 {
 121         return twl_i2c_write_u8(TWL4030_MODULE_MAIN_CHARGE, val, reg);
 122 }
 123
 124 static int twl4030_clear_set_boot_bci(u8 clear, u8 set)
 125 {
 126         return twl4030_clear_set(TWL4030_MODULE_PM_MASTER, clear,
 127                         TWL4030_CONFIG_DONE | TWL4030_BCIAUTOWEN | set,
 128                         TWL4030_PM_MASTER_BOOT_BCI);
 129 }
 130
 131 static int twl4030bci_read_adc_val(u8 reg)
 132 {
 133         int ret, temp;
 134         u8 val;
 135
 136         /* read MSB */
 137         ret = twl4030_bci_read(reg + 1, &val);
 138         if (ret)
 139                 return ret;
 140
 141         temp = (int)(val & 0x03) << 8;
 142
 143         /* read LSB */
 144         ret = twl4030_bci_read(reg, &val);
 145         if (ret)
 146                 return ret;
 147
 148         return temp | val;
 149 }
 150
 151 /*
 152  * Check if VBUS power is present
 153  */
 154 static int twl4030_bci_have_vbus(struct twl4030_bci *bci)
 155 {
 156         int ret;
 157         u8 hwsts;
 158
 159         ret = twl_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &hwsts,
 160                               TWL4030_PM_MASTER_STS_HW_CONDITIONS);
 161         if (ret < 0)
 162                 return 0;
 163
 164         dev_dbg(bci->dev, "check_vbus: HW_CONDITIONS %02x\n", hwsts);
 165
 166         /* in case we also have STS_USB_ID, VBUS is driven by TWL itself */
 167         if ((hwsts & TWL4030_STS_VBUS) && !(hwsts & TWL4030_STS_USB_ID))
 168                 return 1;
 169
 170         return 0;
 171 }
 172
 173 /*
 174  * Enable/Disable USB Charge functionality.
 175  */
 176 static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
 177 {
 178         int ret;
 179
 180         if (enable) {
 181                 if (!bci->usb_charge_enable)
 182                         return -EACCES;
 183
 184                 /* Check for USB charger conneted */
 185                 if (!twl4030_bci_have_vbus(bci))
 186                         return -ENODEV;
 187
 188                 /*
 189                  * Until we can find out what current the device can provide,
 190                  * require a module param to enable USB charging.
 191                  */
 192                 if (!allow_usb) {
 193                         dev_warn(bci->dev, "USB charging is disabled.\n");
 194                         return -EACCES;
 195                 }
 196
 197                 /* Need to keep regulator on */
 198                 if (!bci->usb_enabled &&
 199                     bci->usb_reg &&
 200                     regulator_enable(bci->usb_reg) == 0)
 201                         bci->usb_enabled = 1;
 202
 203                 /* forcing the field BCIAUTOUSB (BOOT_BCI[1]) to 1 */
 204                 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOUSB);
 205                 if (ret < 0)
 206                         return ret;
 207
 208                 /* forcing USBFASTMCHG(BCIMFSTS4[2]) to 1 */
 209                 ret = twl4030_clear_set(TWL4030_MODULE_MAIN_CHARGE, 0,
 210                         TWL4030_USBFASTMCHG, TWL4030_BCIMFSTS4);
 211         } else {
 212                 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOUSB, 0);
 213                 if (bci->usb_enabled &&
 214                     regulator_disable(bci->usb_reg) == 0)
 215                         bci->usb_enabled = 0;
 216         }
 217
 218         return ret;
 219 }
 220
 221 /*
 222  * Enable/Disable AC Charge funtionality.
 223  */
 224 static int twl4030_charger_enable_ac(bool enable)
 225 {
 226         int ret;
 227
 228         if (enable)
 229                 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOAC);
 230         else
 231                 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC, 0);
 232
 233         return ret;
 234 }
 235
 236 static int set_charge_current(struct twl4030_bci *bci, int new_current)
 237 {
 238         u8 tmp, boot_bci_prev, cgain_set, cgain_clear;
 239         int ret;
 240
 241         ret = twl_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &boot_bci_prev,
 242                 TWL4030_PM_MASTER_BOOT_BCI);
 243         if (ret)
 244                 goto out;
 245
 246         /*
 247          * Stop automatic charging here, because charge current change
 248          * requires multiple register writes and CGAIN change requires
 249          * automatic charge to be stopped.
 250          */
 251         ret = twl4030_clear_set_boot_bci(
 252                 TWL4030_BCIAUTOAC | TWL4030_BCIAUTOUSB | 4, 0);
 253         if (ret)
 254                 goto out;
 255
 256         ret = twl4030_bci_write(TWL4030_BCIMFKEY, TWL4030_KEY_IIREF);
 257         if (ret)
 258                 goto out;
 259
 260         ret = twl4030_bci_write(TWL4030_BCIIREF1, new_current & 0xff);
 261         if (ret)
 262                 goto out;
 263
 264         ret = twl4030_bci_write(TWL4030_BCIMFKEY, TWL4030_KEY_IIREF);
 265         if (ret)
 266                 goto out;
 267
 268         ret = twl4030_bci_write(TWL4030_BCIIREF2, (new_current >> 8) & 0x1);
 269         if (ret)
 270                 goto out;
 271
 272         /* Set CGAIN = 0 or 1 */
 273         if (new_current > 511) {
 274                 cgain_set = TWL4030_CGAIN;
 275                 cgain_clear = 0;
 276         } else {
 277                 cgain_set = 0;
 278                 cgain_clear = TWL4030_CGAIN;
 279         }
 280
 281         ret = twl4030_clear_set(TWL4030_MODULE_MAIN_CHARGE,
 282                         cgain_clear, cgain_set, TWL4030_BCICTL1);
 283         if (ret)
 284                 goto out;
 285
 286         ret = twl4030_bci_read(TWL4030_BCICTL1, &tmp);
 287         if (ret != 0 || (tmp & TWL4030_CGAIN) != cgain_set) {
 288                 dev_err(bci->dev, "CGAIN change failed\n");
 289                 goto out;
 290         }
 291
 292         ret = twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER, boot_bci_prev,
 293                 TWL4030_PM_MASTER_BOOT_BCI);
 294 out:
 295         if (ret != 0)
 296                 dev_err(bci->dev, "charge current change failed\n");
 297
 298         return ret;
 299 }
 300
 301 /*
 302  * TWL4030 CHG_PRES (AC charger presence) events
 303  */
 304 static irqreturn_t twl4030_charger_interrupt(int irq, void *arg)
 305 {
 306         struct twl4030_bci *bci = arg;
 307
 308         dev_dbg(bci->dev, "CHG_PRES irq\n");
 309         power_supply_changed(&bci->ac);
 310         power_supply_changed(&bci->usb);
 311
 312         return IRQ_HANDLED;
 313 }
 314
 315 /*
 316  * TWL4030 BCI monitoring events
 317  */
 318 static irqreturn_t twl4030_bci_interrupt(int irq, void *arg)
 319 {
 320         struct twl4030_bci *bci = arg;
 321         u8 irqs1, irqs2;
 322         int ret;
 323
 324         ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs1,
 325                               TWL4030_INTERRUPTS_BCIISR1A);
 326         if (ret < 0)
 327                 return IRQ_HANDLED;
 328
 329         ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs2,
 330                               TWL4030_INTERRUPTS_BCIISR2A);
 331         if (ret < 0)
 332                 return IRQ_HANDLED;
 333
 334         dev_dbg(bci->dev, "BCI irq %02x %02x\n", irqs2, irqs1);
 335
 336         if (irqs1 & (TWL4030_ICHGLOW | TWL4030_ICHGEOC)) {
 337                 /* charger state change, inform the core */
 338                 power_supply_changed(&bci->ac);
 339                 power_supply_changed(&bci->usb);
 340         }
 341
 342         /* various monitoring events, for now we just log them here */
 343         if (irqs1 & (TWL4030_TBATOR2 | TWL4030_TBATOR1) &&
 344                         __ratelimit(&bci->ratelimit))
 345                 dev_warn(bci->dev, "battery temperature out of range\n");
 346
 347         if (irqs1 & TWL4030_BATSTS && __ratelimit(&bci->ratelimit))
 348                 dev_crit(bci->dev, "battery disconnected\n");
 349
 350         if (irqs2 & TWL4030_VBATOV && __ratelimit(&bci->ratelimit))
 351                 dev_crit(bci->dev, "VBAT overvoltage\n");
 352
 353         if (irqs2 & TWL4030_VBUSOV && __ratelimit(&bci->ratelimit))
 354                 dev_crit(bci->dev, "VBUS overvoltage\n");
 355
 356         if (irqs2 & TWL4030_ACCHGOV && __ratelimit(&bci->ratelimit))
 357                 dev_crit(bci->dev, "Ac charger overvoltage\n");
 358
 359         /* ack the interrupts */
 360         twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, irqs1,
 361                          TWL4030_INTERRUPTS_BCIISR1A);
 362         twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, irqs2,
 363                          TWL4030_INTERRUPTS_BCIISR2A);
 364
 365         return IRQ_HANDLED;
 366 }
 367
 368 static void twl4030_bci_usb_work(struct work_struct *data)
 369 {
 370         struct twl4030_bci *bci = container_of(data, struct twl4030_bci, work);
 371
 372         switch (bci->event) {
 373         case USB_EVENT_VBUS:
 374         case USB_EVENT_CHARGER:
 375                 twl4030_charger_enable_usb(bci, true);
 376                 break;
 377         case USB_EVENT_NONE:
 378                 twl4030_charger_enable_usb(bci, false);
 379                 break;
 380         }
 381 }
 382
 383 static int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val,
 384                                void *priv)
 385 {
 386         struct twl4030_bci *bci = container_of(nb, struct twl4030_bci, otg_nb);
 387
 388         dev_dbg(bci->dev, "OTG notify %lu\n", val);
 389
 390         bci->event = val;
 391         schedule_work(&bci->work);
 392
 393         return NOTIFY_OK;
 394 }
 395
 396 /*
 397  * TI provided formulas:
 398  * CGAIN == 0: ICHG = (BCIICHG * 1.7) / (2^10 - 1) - 0.85
 399  * CGAIN == 1: ICHG = (BCIICHG * 3.4) / (2^10 - 1) - 1.7
 400  * Here we use integer approximation of:
 401  * CGAIN == 0: val * 1.6618 - 0.85
 402  * CGAIN == 1: (val * 1.6618 - 0.85) * 2
 403  */
 404 static int twl4030_charger_get_current(void)
 405 {
 406         int curr;
 407         int ret;
 408         u8 bcictl1;
 409
 410         curr = twl4030bci_read_adc_val(TWL4030_BCIICHG);
 411         if (curr < 0)
 412                 return curr;
 413
 414         ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
 415         if (ret)
 416                 return ret;
 417
 418         ret = (curr * 16618 - 850 * 10000) / 10;
 419         if (bcictl1 & TWL4030_CGAIN)
 420                 ret *= 2;
 421
 422         return ret;
 423 }
 424
 425 static ssize_t twl4030_bci_ac_show_enable(struct device *dev,
 426                                           struct device_attribute *attr,
 427                                           char *buf)
 428 {
 429         u8 boot_bci;
 430         int ret;
 431
 432         ret = twl_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &boot_bci,
 433                               TWL4030_PM_MASTER_BOOT_BCI);
 434         if (ret)
 435                 return ret;
 436
 437         return sprintf(buf, "%d\n", (boot_bci & TWL4030_BCIAUTOAC) ? 1 : 0);
 438 }
 439
 440 static ssize_t twl4030_bci_ac_store_enable(struct device *dev,
 441                                            struct device_attribute *attr,
 442                                            const char *buf, size_t count)
 443 {
 444         struct power_supply *psy = dev_get_drvdata(dev);
 445         struct twl4030_bci *bci = container_of(psy, struct twl4030_bci, ac);
 446         unsigned long enable;
 447         int ret;
 448
 449         ret = strict_strtoul(buf, 10, &enable);
 450         if (ret || enable > 1)
 451                 return -EINVAL;
 452
 453         bci->ac_charge_enable = enable;
 454         twl4030_charger_enable_ac(enable);
 455
 456         return count;
 457 }
 458 static struct device_attribute dev_attr_enable_ac =
 459         __ATTR(enable, S_IRUGO | S_IWUSR, twl4030_bci_ac_show_enable,
 460         twl4030_bci_ac_store_enable);
 461
 462 static ssize_t twl4030_bci_usb_show_enable(struct device *dev,
 463                                            struct device_attribute *attr,
 464                                            char *buf)
 465 {
 466         u8 boot_bci;
 467         int ret;
 468
 469         ret = twl_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &boot_bci,
 470                               TWL4030_PM_MASTER_BOOT_BCI);
 471         if (ret)
 472                 return ret;
 473
 474         return sprintf(buf, "%d\n", (boot_bci & TWL4030_BCIAUTOUSB) ? 1 : 0);
 475 }
 476
 477 static ssize_t twl4030_bci_usb_store_enable(struct device *dev,
 478                                             struct device_attribute *attr,
 479                                             const char *buf, size_t count)
 480 {
 481         struct power_supply *psy = dev_get_drvdata(dev);
 482         struct twl4030_bci *bci = container_of(psy, struct twl4030_bci, usb);
 483         unsigned long enable;
 484         int ret;
 485
 486         ret = strict_strtoul(buf, 10, &enable);
 487         if (ret || enable > 1)
 488                 return -EINVAL;
 489
 490         bci->usb_charge_enable = enable;
 491         twl4030_charger_enable_usb(bci, enable);
 492
 493         return count;
 494 }
 495 static struct device_attribute dev_attr_enable_usb =
 496         __ATTR(enable, S_IRUGO | S_IWUSR, twl4030_bci_usb_show_enable,
 497         twl4030_bci_usb_store_enable);
 498
 499 static ssize_t show_charge_current(struct device *dev,
 500                         struct device_attribute *attr, char *buf)
 501 {
 502         int ret, val;
 503         u8 ctl;
 504
 505         val = twl4030bci_read_adc_val(TWL4030_BCIIREF1);
 506         if (val < 0)
 507                 return val;
 508         ret = twl4030_bci_read(TWL4030_BCICTL1, &ctl);
 509         if (ret < 0)
 510                 return ret;
 511
 512         val &= 0x1ff;
 513         if (ctl & TWL4030_CGAIN)
 514                 val |= 0x200;
 515
 516         return sprintf(buf, "%d\n", val);
 517 }
 518
 519 static ssize_t store_charge_current(struct device *dev,
 520                         struct device_attribute *attr, const char *buf,
 521                         size_t count)
 522 {
 523         struct power_supply *psy = dev_get_drvdata(dev);
 524         struct twl4030_bci *bci = dev_get_drvdata(psy->dev->parent);
 525         unsigned long new_current;
 526         int ret;
 527
 528         ret = strict_strtoul(buf, 10, &new_current);
 529         if (ret)
 530                 return -EINVAL;
 531
 532         ret = set_charge_current(bci, new_current);
 533         if (ret)
 534                 return ret;
 535
 536         if (bci->current_supply == POWER_SUPPLY_TYPE_MAINS)
 537                 bci->ac_current = new_current;
 538         else
 539                 bci->usb_current = new_current;
 540
 541         return count;
 542 }
 543 static DEVICE_ATTR(charge_current, S_IRUGO | S_IWUSR, show_charge_current,
 544         store_charge_current);
 545
 546 static struct attribute *bci_ac_attrs[] = {
 547         &dev_attr_enable_ac.attr,
 548         &dev_attr_charge_current.attr,
 549         NULL,
 550 };
 551
 552 static struct attribute *bci_usb_attrs[] = {
 553         &dev_attr_enable_usb.attr,
 554         &dev_attr_charge_current.attr,
 555         NULL,
 556 };
 557
 558 static const struct attribute_group bci_ac_attr_group = {
 559         .attrs = bci_ac_attrs,
 560 };
 561
 562 static const struct attribute_group bci_usb_attr_group = {
 563         .attrs = bci_usb_attrs,
 564 };
 565
 566 /*
 567  * Returns the main charge FSM state
 568  * Or < 0 on failure.
 569  */
 570 static int twl4030bci_state(struct twl4030_bci *bci)
 571 {
 572         int ret;
 573         u8 state;
 574
 575         ret = twl4030_bci_read(TWL4030_BCIMSTATEC, &state);
 576         if (ret) {
 577                 pr_err("twl4030_bci: error reading BCIMSTATEC\n");
 578                 return ret;
 579         }
 580
 581         dev_dbg(bci->dev, "state: %02x\n", state);
 582
 583         return state;
 584 }
 585
 586 static int twl4030_bci_state_to_status(int state)
 587 {
 588         state &= TWL4030_MSTATEC_MASK;
 589         if (TWL4030_MSTATEC_QUICK1 <= state && state <= TWL4030_MSTATEC_QUICK7)
 590                 return POWER_SUPPLY_STATUS_CHARGING;
 591         else if (TWL4030_MSTATEC_COMPLETE1 <= state &&
 592                                         state <= TWL4030_MSTATEC_COMPLETE4)
 593                 return POWER_SUPPLY_STATUS_FULL;
 594         else
 595                 return POWER_SUPPLY_STATUS_NOT_CHARGING;
 596 }
 597
 598 static int twl4030_bci_get_property(struct power_supply *psy,
 599                                     enum power_supply_property psp,
 600                                     union power_supply_propval *val)
 601 {
 602         struct twl4030_bci *bci = dev_get_drvdata(psy->dev->parent);
 603         int is_charging;
 604         int state;
 605         int ret;
 606
 607         state = twl4030bci_state(bci);
 608         if (state < 0)
 609                 return state;
 610
 611         if (psy->type == POWER_SUPPLY_TYPE_USB)
 612                 is_charging = state & TWL4030_MSTATEC_USB;
 613         else
 614                 is_charging = state & TWL4030_MSTATEC_AC;
 615         if (is_charging && psy->type != bci->current_supply) {
 616                 if (psy->type == POWER_SUPPLY_TYPE_USB)
 617                         set_charge_current(bci, bci->usb_current);
 618                 else
 619                         set_charge_current(bci, bci->ac_current);
 620                 bci->current_supply = psy->type;
 621         }
 622
 623         switch (psp) {
 624         case POWER_SUPPLY_PROP_STATUS:
 625                 if (is_charging)
 626                         val->intval = twl4030_bci_state_to_status(state);
 627                 else
 628                         val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
 629                 break;
 630         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 631                 /* charging must be active for meaningful result */
 632                 if (!is_charging)
 633                         return -ENODATA;
 634                 if (psy->type == POWER_SUPPLY_TYPE_USB) {
 635                         ret = twl4030bci_read_adc_val(TWL4030_BCIVBUS);
 636                         if (ret < 0)
 637                                 return ret;
 638                         /* BCIVBUS uses ADCIN8, 7/1023 V/step */
 639                         val->intval = ret * 6843;
 640                 } else {
 641                         ret = twl4030bci_read_adc_val(TWL4030_BCIVAC);
 642                         if (ret < 0)
 643                                 return ret;
 644                         /* BCIVAC uses ADCIN11, 10/1023 V/step */
 645                         val->intval = ret * 9775;
 646                 }
 647                 break;
 648         case POWER_SUPPLY_PROP_CURRENT_NOW:
 649                 if (!is_charging)
 650                         return -ENODATA;
 651                 /* current measurement is shared between AC and USB */
 652                 ret = twl4030_charger_get_current();
 653                 if (ret < 0)
 654                         return ret;
 655                 val->intval = ret;
 656                 break;
 657         case POWER_SUPPLY_PROP_ONLINE:
 658                 val->intval = is_charging &&
 659                         twl4030_bci_state_to_status(state) !=
 660                                 POWER_SUPPLY_STATUS_NOT_CHARGING;
 661                 break;
 662         default:
 663                 return -EINVAL;
 664         }
 665
 666         return 0;
 667 }
 668
 669 static enum power_supply_property twl4030_charger_props[] = {
 670         POWER_SUPPLY_PROP_STATUS,
 671         POWER_SUPPLY_PROP_ONLINE,
 672         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 673         POWER_SUPPLY_PROP_CURRENT_NOW,
 674 };
 675
 676 static int __init twl4030_bci_probe(struct platform_device *pdev)
 677 {
 678         const struct twl4030_bci_platform_data *pdata = pdev->dev.platform_data;
 679         struct twl4030_bci *bci;
 680         int ret;
 681         u32 reg;
 682
 683         if (pdata == NULL) {
 684                 dev_err(&pdev->dev, "No platform data\n");
 685                 return -EINVAL;
 686         }
 687
 688         bci = kzalloc(sizeof(*bci), GFP_KERNEL);
 689         if (bci == NULL)
 690                 return -ENOMEM;
 691
 692         bci->dev = &pdev->dev;
 693         bci->irq_chg = platform_get_irq(pdev, 0);
 694         bci->irq_bci = platform_get_irq(pdev, 1);
 695         bci->ac_current = 860; /* ~1.2A */
 696         bci->usb_current = 360; /* ~600mA */
 697
 698         platform_set_drvdata(pdev, bci);
 699
 700         ratelimit_state_init(&bci->ratelimit, HZ, 2);
 701
 702         bci->ac.name = "twl4030_ac";
 703         bci->ac.type = POWER_SUPPLY_TYPE_MAINS;
 704         bci->ac.properties = twl4030_charger_props;
 705         bci->ac.num_properties = ARRAY_SIZE(twl4030_charger_props);
 706         bci->ac.get_property = twl4030_bci_get_property;
 707         bci->ac.supplied_to = pdata->supplied_to;
 708         bci->ac.num_supplicants = pdata->num_supplicants;
 709
 710         ret = power_supply_register(&pdev->dev, &bci->ac);
 711         if (ret) {
 712                 dev_err(&pdev->dev, "failed to register ac: %d\n", ret);
 713                 goto fail_register_ac;
 714         }
 715
 716         bci->usb.name = "twl4030_usb";
 717         bci->usb.type = POWER_SUPPLY_TYPE_USB;
 718         bci->usb.properties = twl4030_charger_props;
 719         bci->usb.num_properties = ARRAY_SIZE(twl4030_charger_props);
 720         bci->usb.get_property = twl4030_bci_get_property;
 721         bci->usb.supplied_to = pdata->supplied_to;
 722         bci->usb.num_supplicants = pdata->num_supplicants;
 723
 724         bci->usb_reg = regulator_get(bci->dev, "bci3v1");
 725         if (IS_ERR(bci->usb_reg)) {
 726                 dev_warn(&pdev->dev, "regulator get bci3v1 failed\n");
 727                 bci->usb_reg = NULL;
 728         }
 729
 730         ret = power_supply_register(&pdev->dev, &bci->usb);
 731         if (ret) {
 732                 dev_err(&pdev->dev, "failed to register usb: %d\n", ret);
 733                 goto fail_register_usb;
 734         }
 735
 736         ret = request_threaded_irq(bci->irq_chg, NULL,
 737                         twl4030_charger_interrupt, 0, pdev->name, bci);
 738         if (ret < 0) {
 739                 dev_err(&pdev->dev, "could not request irq %d, status %d\n",
 740                         bci->irq_chg, ret);
 741                 goto fail_chg_irq;
 742         }
 743
 744         ret = request_threaded_irq(bci->irq_bci, NULL,
 745                         twl4030_bci_interrupt, 0, pdev->name, bci);
 746         if (ret < 0) {
 747                 dev_err(&pdev->dev, "could not request irq %d, status %d\n",
 748                         bci->irq_bci, ret);
 749                 goto fail_bci_irq;
 750         }
 751
 752         INIT_WORK(&bci->work, twl4030_bci_usb_work);
 753
 754         bci->transceiver = otg_get_transceiver();
 755         if (bci->transceiver != NULL) {
 756                 bci->otg_nb.notifier_call = twl4030_bci_usb_ncb;
 757                 otg_register_notifier(bci->transceiver, &bci->otg_nb);
 758         }
 759
 760         ret = sysfs_create_group(&bci->ac.dev->kobj, &bci_ac_attr_group);
 761         if (ret) {
 762                 dev_err(&pdev->dev, "failed to create sysfs group: %d\n", ret);
 763                 goto fail_sysfs1;
 764         }
 765
 766         ret = sysfs_create_group(&bci->usb.dev->kobj, &bci_usb_attr_group);
 767         if (ret) {
 768                 dev_err(&pdev->dev, "failed to create sysfs group: %d\n", ret);
 769                 goto fail_sysfs2;
 770         }
 771
 772         /* Enable interrupts now. */
 773         reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_ICHGEOC | TWL4030_TBATOR2 |
 774                 TWL4030_TBATOR1 | TWL4030_BATSTS);
 775         ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
 776                                TWL4030_INTERRUPTS_BCIIMR1A);
 777         if (ret < 0) {
 778                 dev_err(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
 779                 goto fail_unmask_interrupts;
 780         }
 781
 782         reg = ~(u32)(TWL4030_VBATOV | TWL4030_VBUSOV | TWL4030_ACCHGOV);
 783         ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
 784                                TWL4030_INTERRUPTS_BCIIMR2A);
 785         if (ret < 0)
 786                 dev_warn(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
 787
 788         bci->ac_charge_enable = true;
 789         bci->usb_charge_enable = true;
 790         twl4030_charger_enable_ac(true);
 791         twl4030_charger_enable_usb(bci, true);
 792
 793         return 0;
 794
 795 fail_unmask_interrupts:
 796         sysfs_remove_group(&bci->usb.dev->kobj, &bci_usb_attr_group);
 797 fail_sysfs2:
 798         sysfs_remove_group(&bci->ac.dev->kobj, &bci_ac_attr_group);
 799 fail_sysfs1:
 800         if (bci->transceiver != NULL) {
 801                 otg_unregister_notifier(bci->transceiver, &bci->otg_nb);
 802                 otg_put_transceiver(bci->transceiver);
 803         }
 804         free_irq(bci->irq_bci, bci);
 805 fail_bci_irq:
 806         free_irq(bci->irq_chg, bci);
 807 fail_chg_irq:
 808         power_supply_unregister(&bci->usb);
 809 fail_register_usb:
 810         power_supply_unregister(&bci->ac);
 811 fail_register_ac:
 812         platform_set_drvdata(pdev, NULL);
 813         kfree(bci);
 814
 815         return ret;
 816 }
 817
 818 static int __exit twl4030_bci_remove(struct platform_device *pdev)
 819 {
 820         struct twl4030_bci *bci = platform_get_drvdata(pdev);
 821
 822         sysfs_remove_group(&bci->usb.dev->kobj, &bci_usb_attr_group);
 823         sysfs_remove_group(&bci->ac.dev->kobj, &bci_ac_attr_group);
 824
 825         twl4030_charger_enable_ac(false);
 826         twl4030_charger_enable_usb(bci, false);
 827
 828         /* mask interrupts */
 829         twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
 830                          TWL4030_INTERRUPTS_BCIIMR1A);
 831         twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
 832                          TWL4030_INTERRUPTS_BCIIMR2A);
 833
 834         if (bci->transceiver != NULL) {
 835                 otg_unregister_notifier(bci->transceiver, &bci->otg_nb);
 836                 otg_put_transceiver(bci->transceiver);
 837         }
 838         free_irq(bci->irq_bci, bci);
 839         free_irq(bci->irq_chg, bci);
 840         power_supply_unregister(&bci->usb);
 841         power_supply_unregister(&bci->ac);
 842         platform_set_drvdata(pdev, NULL);
 843         kfree(bci);
 844
 845         return 0;
 846 }
 847
 848 static struct platform_driver twl4030_bci_driver = {
 849         .driver = {
 850                 .name   = "twl4030_bci",
 851                 .owner  = THIS_MODULE,
 852         },
 853         .remove = __exit_p(twl4030_bci_remove),
 854 };
 855
 856 static int __init twl4030_bci_init(void)
 857 {
 858         return platform_driver_probe(&twl4030_bci_driver, twl4030_bci_probe);
 859 }
 860 module_init(twl4030_bci_init);
 861
 862 static void __exit twl4030_bci_exit(void)
 863 {
 864         platform_driver_unregister(&twl4030_bci_driver);
 865 }
 866 module_exit(twl4030_bci_exit);
 867
 868 MODULE_AUTHOR("Gražvydas Ignotas");
 869 MODULE_DESCRIPTION("TWL4030 Battery Charger Interface driver");
 870 MODULE_LICENSE("GPL");
 871 MODULE_ALIAS("platform:twl4030_bci");