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_BCIMFSTS3       0x0f
  32 #define TWL4030_BCIMFSTS4       0x10
  33 #define TWL4030_BCIMFKEY        0x11
  34 #define TWL4030_BCICTL1         0x23
  35 #define TWL4030_BCIIREF1        0x27
  36 #define TWL4030_BCIIREF2        0x28
  37
  38 #define TWL4030_BCIAUTOWEN      BIT(5)
  39 #define TWL4030_CONFIG_DONE     BIT(4)
  40 #define TWL4030_CVENAC          BIT(2)
  41 #define TWL4030_BCIAUTOUSB      BIT(1)
  42 #define TWL4030_BCIAUTOAC       BIT(0)
  43 #define TWL4030_CGAIN           BIT(5)
  44 #define TWL4030_USBFASTMCHG     BIT(2)
  45 #define TWL4030_STS_VBUS        BIT(7)
  46 #define TWL4030_STS_USB_ID      BIT(2)
  47
  48 /* BCI interrupts */
  49 #define TWL4030_WOVF            BIT(0) /* Watchdog overflow */
  50 #define TWL4030_TMOVF           BIT(1) /* Timer overflow */
  51 #define TWL4030_ICHGHIGH        BIT(2) /* Battery charge current high */
  52 #define TWL4030_ICHGLOW         BIT(3) /* Battery cc. low / FSM state change */
  53 #define TWL4030_ICHGEOC         BIT(4) /* Battery current end-of-charge */
  54 #define TWL4030_TBATOR2         BIT(5) /* Battery temperature out of range 2 */
  55 #define TWL4030_TBATOR1         BIT(6) /* Battery temperature out of range 1 */
  56 #define TWL4030_BATSTS          BIT(7) /* Battery status */
  57
  58 #define TWL4030_VBATLVL         BIT(0) /* VBAT level */
  59 #define TWL4030_VBATOV          BIT(1) /* VBAT overvoltage */
  60 #define TWL4030_VBUSOV          BIT(2) /* VBUS overvoltage */
  61 #define TWL4030_ACCHGOV         BIT(3) /* Ac charger overvoltage */
  62
  63 #define TWL4030_MSTATEC_USB             BIT(4)
  64 #define TWL4030_MSTATEC_AC              BIT(5)
  65 #define TWL4030_MSTATEC_MASK            0x0f
  66 #define TWL4030_MSTATEC_QUICK1          0x02
  67 #define TWL4030_MSTATEC_QUICK7          0x07
  68 #define TWL4030_MSTATEC_COMPLETE1       0x0b
  69 #define TWL4030_MSTATEC_COMPLETE4       0x0e
  70
  71 #define TWL4030_KEY_IIREF               0xe7
  72 #define TWL4030_BATSTSMCHG              BIT(6)
  73
  74 static bool allow_usb = 1;
  75 module_param(allow_usb, bool, 0644);
  76 MODULE_PARM_DESC(allow_usb, "Allow USB charge drawing default current");
  77
  78 struct twl4030_bci {
  79         struct device           *dev;
  80         struct power_supply     ac;
  81         struct power_supply     usb;
  82         struct otg_transceiver  *transceiver;
  83         struct notifier_block   otg_nb;
  84         struct work_struct      work;
  85         int                     irq_chg;
  86         int                     irq_bci;
  87         bool                    ac_charge_enable;
  88         bool                    usb_charge_enable;
  89         int                     usb_current;
  90         int                     ac_current;
  91         enum power_supply_type  current_supply;
  92         struct regulator        *usb_reg;
  93         int                     usb_enabled;
  94
  95         unsigned long           event;
  96         struct ratelimit_state  ratelimit;
  97 };
  98
  99 /*
 100  * clear and set bits on an given register on a given module
 101  */
 102 static int twl4030_clear_set(u8 mod_no, u8 clear, u8 set, u8 reg)
 103 {
 104         u8 val = 0;
 105         int ret;
 106
 107         ret = twl_i2c_read_u8(mod_no, &val, reg);
 108         if (ret)
 109                 return ret;
 110
 111         val &= ~clear;
 112         val |= set;
 113
 114         return twl_i2c_write_u8(mod_no, val, reg);
 115 }
 116
 117 static int twl4030_bci_read(u8 reg, u8 *val)
 118 {
 119         return twl_i2c_read_u8(TWL4030_MODULE_MAIN_CHARGE, val, reg);
 120 }
 121
 122 static int twl4030_bci_write(u8 reg, u8 val)
 123 {
 124         return twl_i2c_write_u8(TWL4030_MODULE_MAIN_CHARGE, val, reg);
 125 }
 126
 127 static int twl4030_clear_set_boot_bci(u8 clear, u8 set)
 128 {
 129         return twl4030_clear_set(TWL4030_MODULE_PM_MASTER, clear,
 130                         TWL4030_CONFIG_DONE | TWL4030_BCIAUTOWEN | set,
 131                         TWL4030_PM_MASTER_BOOT_BCI);
 132 }
 133
 134 static int twl4030bci_read_adc_val(u8 reg)
 135 {
 136         int ret, temp;
 137         u8 val;
 138
 139         /* read MSB */
 140         ret = twl4030_bci_read(reg + 1, &val);
 141         if (ret)
 142                 return ret;
 143
 144         temp = (int)(val & 0x03) << 8;
 145
 146         /* read LSB */
 147         ret = twl4030_bci_read(reg, &val);
 148         if (ret)
 149                 return ret;
 150
 151         return temp | val;
 152 }
 153
 154 /*
 155  * Check if VBUS power is present
 156  */
 157 static int twl4030_bci_have_vbus(struct twl4030_bci *bci)
 158 {
 159         int ret;
 160         u8 hwsts;
 161
 162         ret = twl_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &hwsts,
 163                               TWL4030_PM_MASTER_STS_HW_CONDITIONS);
 164         if (ret < 0)
 165                 return 0;
 166
 167         dev_dbg(bci->dev, "check_vbus: HW_CONDITIONS %02x\n", hwsts);
 168
 169         /* in case we also have STS_USB_ID, VBUS is driven by TWL itself */
 170         if ((hwsts & TWL4030_STS_VBUS) && !(hwsts & TWL4030_STS_USB_ID))
 171                 return 1;
 172
 173         return 0;
 174 }
 175
 176 /*
 177  * Enable/Disable USB Charge functionality.
 178  */
 179 static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
 180 {
 181         int ret;
 182
 183         if (enable) {
 184                 if (!bci->usb_charge_enable)
 185                         return -EACCES;
 186
 187                 /* Check for USB charger conneted */
 188                 if (!twl4030_bci_have_vbus(bci))
 189                         return -ENODEV;
 190
 191                 /*
 192                  * Until we can find out what current the device can provide,
 193                  * require a module param to enable USB charging.
 194                  */
 195                 if (!allow_usb) {
 196                         dev_warn(bci->dev, "USB charging is disabled.\n");
 197                         return -EACCES;
 198                 }
 199
 200                 /* Need to keep regulator on */
 201                 if (!bci->usb_enabled &&
 202                     bci->usb_reg &&
 203                     regulator_enable(bci->usb_reg) == 0)
 204                         bci->usb_enabled = 1;
 205
 206                 /* forcing the field BCIAUTOUSB (BOOT_BCI[1]) to 1 */
 207                 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOUSB);
 208                 if (ret < 0)
 209                         return ret;
 210
 211                 /* forcing USBFASTMCHG(BCIMFSTS4[2]) to 1 */
 212                 ret = twl4030_clear_set(TWL4030_MODULE_MAIN_CHARGE, 0,
 213                         TWL4030_USBFASTMCHG, TWL4030_BCIMFSTS4);
 214         } else {
 215                 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOUSB, 0);
 216                 if (bci->usb_enabled &&
 217                     regulator_disable(bci->usb_reg) == 0)
 218                         bci->usb_enabled = 0;
 219         }
 220
 221         return ret;
 222 }
 223
 224 /*
 225  * Enable/Disable AC Charge funtionality.
 226  */
 227 static int twl4030_charger_enable_ac(bool enable)
 228 {
 229         int ret;
 230
 231         if (enable)
 232                 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOAC);
 233         else
 234                 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC, 0);
 235
 236         return ret;
 237 }
 238
 239 static int set_charge_current(struct twl4030_bci *bci, int new_current)
 240 {
 241         u8 val, boot_bci_prev, cgain_set, cgain_clear;
 242         int ret, ret2;
 243
 244         ret = twl4030_bci_read(TWL4030_BCIMFSTS3, &val);
 245         if (ret)
 246                 goto out_norestore;
 247
 248         if (!(val & TWL4030_BATSTSMCHG)) {
 249                 dev_err(bci->dev, "missing battery, can't change charge_current\n");
 250                 goto out_norestore;
 251         }
 252
 253         ret = twl_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &boot_bci_prev,
 254                 TWL4030_PM_MASTER_BOOT_BCI);
 255         if (ret)
 256                 goto out_norestore;
 257
 258         /*
 259          * Stop automatic charging here, because charge current change
 260          * requires multiple register writes and CGAIN change requires
 261          * automatic charge to be stopped (and CV mode disabled too).
 262          */
 263         ret = twl4030_clear_set_boot_bci(
 264                 TWL4030_CVENAC | TWL4030_BCIAUTOAC | TWL4030_BCIAUTOUSB, 0);
 265         if (ret)
 266                 goto out;
 267
 268         ret = twl4030_bci_write(TWL4030_BCIMFKEY, TWL4030_KEY_IIREF);
 269         if (ret)
 270                 goto out;
 271
 272         ret = twl4030_bci_write(TWL4030_BCIIREF1, new_current & 0xff);
 273         if (ret)
 274                 goto out;
 275
 276         ret = twl4030_bci_write(TWL4030_BCIMFKEY, TWL4030_KEY_IIREF);
 277         if (ret)
 278                 goto out;
 279
 280         ret = twl4030_bci_write(TWL4030_BCIIREF2, (new_current >> 8) & 0x1);
 281         if (ret)
 282                 goto out;
 283
 284         /* Set CGAIN = 0 or 1 */
 285         if (new_current > 511) {
 286                 cgain_set = TWL4030_CGAIN;
 287                 cgain_clear = 0;
 288         } else {
 289                 cgain_set = 0;
 290                 cgain_clear = TWL4030_CGAIN;
 291         }
 292
 293         ret = twl4030_clear_set(TWL4030_MODULE_MAIN_CHARGE,
 294                         cgain_clear, cgain_set, TWL4030_BCICTL1);
 295         if (ret)
 296                 goto out;
 297
 298         ret = twl4030_bci_read(TWL4030_BCICTL1, &val);
 299         if (ret != 0 || (val & TWL4030_CGAIN) != cgain_set) {
 300                 dev_err(bci->dev, "CGAIN change failed\n");
 301                 goto out;
 302         }
 303
 304 out:
 305         ret2 = twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER, boot_bci_prev,
 306                 TWL4030_PM_MASTER_BOOT_BCI);
 307         if (ret2 != 0)
 308                 dev_err(bci->dev, "failed boot_bci restore: %d\n", ret2);
 309
 310 out_norestore:
 311         if (ret != 0)
 312                 dev_err(bci->dev, "charge current change failed: %d\n", ret);
 313
 314         return ret;
 315 }
 316
 317 /*
 318  * TWL4030 CHG_PRES (AC charger presence) events
 319  */
 320 static irqreturn_t twl4030_charger_interrupt(int irq, void *arg)
 321 {
 322         struct twl4030_bci *bci = arg;
 323
 324         dev_dbg(bci->dev, "CHG_PRES irq\n");
 325         power_supply_changed(&bci->ac);
 326         power_supply_changed(&bci->usb);
 327
 328         return IRQ_HANDLED;
 329 }
 330
 331 /*
 332  * TWL4030 BCI monitoring events
 333  */
 334 static irqreturn_t twl4030_bci_interrupt(int irq, void *arg)
 335 {
 336         struct twl4030_bci *bci = arg;
 337         u8 irqs1, irqs2;
 338         int ret;
 339
 340         ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs1,
 341                               TWL4030_INTERRUPTS_BCIISR1A);
 342         if (ret < 0)
 343                 return IRQ_HANDLED;
 344
 345         ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs2,
 346                               TWL4030_INTERRUPTS_BCIISR2A);
 347         if (ret < 0)
 348                 return IRQ_HANDLED;
 349
 350         dev_dbg(bci->dev, "BCI irq %02x %02x\n", irqs2, irqs1);
 351
 352         if (irqs1 & (TWL4030_ICHGLOW | TWL4030_ICHGEOC)) {
 353                 /* charger state change, inform the core */
 354                 power_supply_changed(&bci->ac);
 355                 power_supply_changed(&bci->usb);
 356         }
 357
 358         /* various monitoring events, for now we just log them here */
 359         if (irqs1 & (TWL4030_TBATOR2 | TWL4030_TBATOR1) &&
 360                         __ratelimit(&bci->ratelimit))
 361                 dev_warn(bci->dev, "battery temperature out of range\n");
 362
 363         if (irqs1 & TWL4030_BATSTS && __ratelimit(&bci->ratelimit))
 364                 dev_crit(bci->dev, "battery disconnected\n");
 365
 366         if (irqs2 & TWL4030_VBATOV && __ratelimit(&bci->ratelimit))
 367                 dev_crit(bci->dev, "VBAT overvoltage\n");
 368
 369         if (irqs2 & TWL4030_VBUSOV && __ratelimit(&bci->ratelimit))
 370                 dev_crit(bci->dev, "VBUS overvoltage\n");
 371
 372         if (irqs2 & TWL4030_ACCHGOV && __ratelimit(&bci->ratelimit))
 373                 dev_crit(bci->dev, "Ac charger overvoltage\n");
 374
 375         /* ack the interrupts */
 376         twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, irqs1,
 377                          TWL4030_INTERRUPTS_BCIISR1A);
 378         twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, irqs2,
 379                          TWL4030_INTERRUPTS_BCIISR2A);
 380
 381         return IRQ_HANDLED;
 382 }
 383
 384 static void twl4030_bci_usb_work(struct work_struct *data)
 385 {
 386         struct twl4030_bci *bci = container_of(data, struct twl4030_bci, work);
 387
 388         switch (bci->event) {
 389         case USB_EVENT_VBUS:
 390         case USB_EVENT_CHARGER:
 391                 twl4030_charger_enable_usb(bci, true);
 392                 break;
 393         case USB_EVENT_NONE:
 394                 twl4030_charger_enable_usb(bci, false);
 395                 break;
 396         }
 397 }
 398
 399 static int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val,
 400                                void *priv)
 401 {
 402         struct twl4030_bci *bci = container_of(nb, struct twl4030_bci, otg_nb);
 403
 404         dev_dbg(bci->dev, "OTG notify %lu\n", val);
 405
 406         bci->event = val;
 407         schedule_work(&bci->work);
 408
 409         return NOTIFY_OK;
 410 }
 411
 412 /*
 413  * TI provided formulas:
 414  * CGAIN == 0: ICHG = (BCIICHG * 1.7) / (2^10 - 1) - 0.85
 415  * CGAIN == 1: ICHG = (BCIICHG * 3.4) / (2^10 - 1) - 1.7
 416  * Here we use integer approximation of:
 417  * CGAIN == 0: val * 1.6618 - 0.85
 418  * CGAIN == 1: (val * 1.6618 - 0.85) * 2
 419  */
 420 static int twl4030_charger_get_current(void)
 421 {
 422         int curr;
 423         int ret;
 424         u8 bcictl1;
 425
 426         curr = twl4030bci_read_adc_val(TWL4030_BCIICHG);
 427         if (curr < 0)
 428                 return curr;
 429
 430         ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
 431         if (ret)
 432                 return ret;
 433
 434         ret = (curr * 16618 - 850 * 10000) / 10;
 435         if (bcictl1 & TWL4030_CGAIN)
 436                 ret *= 2;
 437
 438         return ret;
 439 }
 440
 441 static ssize_t twl4030_bci_ac_show_enable(struct device *dev,
 442                                           struct device_attribute *attr,
 443                                           char *buf)
 444 {
 445         u8 boot_bci;
 446         int ret;
 447
 448         ret = twl_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &boot_bci,
 449                               TWL4030_PM_MASTER_BOOT_BCI);
 450         if (ret)
 451                 return ret;
 452
 453         return sprintf(buf, "%d\n", (boot_bci & TWL4030_BCIAUTOAC) ? 1 : 0);
 454 }
 455
 456 static ssize_t twl4030_bci_ac_store_enable(struct device *dev,
 457                                            struct device_attribute *attr,
 458                                            const char *buf, size_t count)
 459 {
 460         struct power_supply *psy = dev_get_drvdata(dev);
 461         struct twl4030_bci *bci = container_of(psy, struct twl4030_bci, ac);
 462         unsigned long enable;
 463         int ret;
 464
 465         ret = strict_strtoul(buf, 10, &enable);
 466         if (ret || enable > 1)
 467                 return -EINVAL;
 468
 469         bci->ac_charge_enable = enable;
 470         twl4030_charger_enable_ac(enable);
 471
 472         return count;
 473 }
 474 static struct device_attribute dev_attr_enable_ac =
 475         __ATTR(enable, S_IRUGO | S_IWUSR, twl4030_bci_ac_show_enable,
 476         twl4030_bci_ac_store_enable);
 477
 478 static ssize_t twl4030_bci_usb_show_enable(struct device *dev,
 479                                            struct device_attribute *attr,
 480                                            char *buf)
 481 {
 482         u8 boot_bci;
 483         int ret;
 484
 485         ret = twl_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &boot_bci,
 486                               TWL4030_PM_MASTER_BOOT_BCI);
 487         if (ret)
 488                 return ret;
 489
 490         return sprintf(buf, "%d\n", (boot_bci & TWL4030_BCIAUTOUSB) ? 1 : 0);
 491 }
 492
 493 static ssize_t twl4030_bci_usb_store_enable(struct device *dev,
 494                                             struct device_attribute *attr,
 495                                             const char *buf, size_t count)
 496 {
 497         struct power_supply *psy = dev_get_drvdata(dev);
 498         struct twl4030_bci *bci = container_of(psy, struct twl4030_bci, usb);
 499         unsigned long enable;
 500         int ret;
 501
 502         ret = strict_strtoul(buf, 10, &enable);
 503         if (ret || enable > 1)
 504                 return -EINVAL;
 505
 506         bci->usb_charge_enable = enable;
 507         twl4030_charger_enable_usb(bci, enable);
 508
 509         return count;
 510 }
 511 static struct device_attribute dev_attr_enable_usb =
 512         __ATTR(enable, S_IRUGO | S_IWUSR, twl4030_bci_usb_show_enable,
 513         twl4030_bci_usb_store_enable);
 514
 515 static ssize_t show_charge_current(struct device *dev,
 516                         struct device_attribute *attr, char *buf)
 517 {
 518         int ret, val;
 519         u8 ctl;
 520
 521         val = twl4030bci_read_adc_val(TWL4030_BCIIREF1);
 522         if (val < 0)
 523                 return val;
 524         ret = twl4030_bci_read(TWL4030_BCICTL1, &ctl);
 525         if (ret < 0)
 526                 return ret;
 527
 528         val &= 0x1ff;
 529         if (ctl & TWL4030_CGAIN)
 530                 val |= 0x200;
 531
 532         return sprintf(buf, "%d\n", val);
 533 }
 534
 535 static ssize_t store_charge_current(struct device *dev,
 536                         struct device_attribute *attr, const char *buf,
 537                         size_t count)
 538 {
 539         struct power_supply *psy = dev_get_drvdata(dev);
 540         struct twl4030_bci *bci = dev_get_drvdata(psy->dev->parent);
 541         unsigned long new_current;
 542         int ret;
 543
 544         ret = strict_strtoul(buf, 10, &new_current);
 545         if (ret)
 546                 return -EINVAL;
 547
 548         ret = set_charge_current(bci, new_current);
 549         if (ret)
 550                 return ret;
 551
 552         if (psy->type == POWER_SUPPLY_TYPE_MAINS)
 553                 bci->ac_current = new_current;
 554         else
 555                 bci->usb_current = new_current;
 556
 557         return count;
 558 }
 559 static DEVICE_ATTR(charge_current, S_IRUGO | S_IWUSR, show_charge_current,
 560         store_charge_current);
 561
 562 static struct attribute *bci_ac_attrs[] = {
 563         &dev_attr_enable_ac.attr,
 564         &dev_attr_charge_current.attr,
 565         NULL,
 566 };
 567
 568 static struct attribute *bci_usb_attrs[] = {
 569         &dev_attr_enable_usb.attr,
 570         &dev_attr_charge_current.attr,
 571         NULL,
 572 };
 573
 574 static const struct attribute_group bci_ac_attr_group = {
 575         .attrs = bci_ac_attrs,
 576 };
 577
 578 static const struct attribute_group bci_usb_attr_group = {
 579         .attrs = bci_usb_attrs,
 580 };
 581
 582 /*
 583  * Returns the main charge FSM state
 584  * Or < 0 on failure.
 585  */
 586 static int twl4030bci_state(struct twl4030_bci *bci)
 587 {
 588         int ret;
 589         u8 state;
 590
 591         ret = twl4030_bci_read(TWL4030_BCIMSTATEC, &state);
 592         if (ret) {
 593                 pr_err("twl4030_bci: error reading BCIMSTATEC\n");
 594                 return ret;
 595         }
 596
 597         dev_dbg(bci->dev, "state: %02x\n", state);
 598
 599         return state;
 600 }
 601
 602 static int twl4030_bci_state_to_status(int state)
 603 {
 604         state &= TWL4030_MSTATEC_MASK;
 605         if (TWL4030_MSTATEC_QUICK1 <= state && state <= TWL4030_MSTATEC_QUICK7)
 606                 return POWER_SUPPLY_STATUS_CHARGING;
 607         else if (TWL4030_MSTATEC_COMPLETE1 <= state &&
 608                                         state <= TWL4030_MSTATEC_COMPLETE4)
 609                 return POWER_SUPPLY_STATUS_FULL;
 610         else
 611                 return POWER_SUPPLY_STATUS_NOT_CHARGING;
 612 }
 613
 614 static int twl4030_bci_get_property(struct power_supply *psy,
 615                                     enum power_supply_property psp,
 616                                     union power_supply_propval *val)
 617 {
 618         struct twl4030_bci *bci = dev_get_drvdata(psy->dev->parent);
 619         int is_charging;
 620         int state;
 621         int ret;
 622
 623         state = twl4030bci_state(bci);
 624         if (state < 0)
 625                 return state;
 626
 627         if (psy->type == POWER_SUPPLY_TYPE_USB)
 628                 is_charging = state & TWL4030_MSTATEC_USB;
 629         else
 630                 is_charging = state & TWL4030_MSTATEC_AC;
 631         if (is_charging && psy->type != bci->current_supply) {
 632                 if (psy->type == POWER_SUPPLY_TYPE_USB)
 633                         set_charge_current(bci, bci->usb_current);
 634                 else
 635                         set_charge_current(bci, bci->ac_current);
 636                 bci->current_supply = psy->type;
 637         }
 638
 639         switch (psp) {
 640         case POWER_SUPPLY_PROP_STATUS:
 641                 if (is_charging)
 642                         val->intval = twl4030_bci_state_to_status(state);
 643                 else
 644                         val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
 645                 break;
 646         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 647                 /* charging must be active for meaningful result */
 648                 if (!is_charging)
 649                         return -ENODATA;
 650                 if (psy->type == POWER_SUPPLY_TYPE_USB) {
 651                         ret = twl4030bci_read_adc_val(TWL4030_BCIVBUS);
 652                         if (ret < 0)
 653                                 return ret;
 654                         /* BCIVBUS uses ADCIN8, 7/1023 V/step */
 655                         val->intval = ret * 6843;
 656                 } else {
 657                         ret = twl4030bci_read_adc_val(TWL4030_BCIVAC);
 658                         if (ret < 0)
 659                                 return ret;
 660                         /* BCIVAC uses ADCIN11, 10/1023 V/step */
 661                         val->intval = ret * 9775;
 662                 }
 663                 break;
 664         case POWER_SUPPLY_PROP_CURRENT_NOW:
 665                 if (!is_charging)
 666                         return -ENODATA;
 667                 /* current measurement is shared between AC and USB */
 668                 ret = twl4030_charger_get_current();
 669                 if (ret < 0)
 670                         return ret;
 671                 val->intval = ret;
 672                 break;
 673         case POWER_SUPPLY_PROP_ONLINE:
 674                 val->intval = is_charging &&
 675                         twl4030_bci_state_to_status(state) !=
 676                                 POWER_SUPPLY_STATUS_NOT_CHARGING;
 677                 break;
 678         default:
 679                 return -EINVAL;
 680         }
 681
 682         return 0;
 683 }
 684
 685 static enum power_supply_property twl4030_charger_props[] = {
 686         POWER_SUPPLY_PROP_STATUS,
 687         POWER_SUPPLY_PROP_ONLINE,
 688         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 689         POWER_SUPPLY_PROP_CURRENT_NOW,
 690 };
 691
 692 static int __init twl4030_bci_probe(struct platform_device *pdev)
 693 {
 694         const struct twl4030_bci_platform_data *pdata = pdev->dev.platform_data;
 695         struct twl4030_bci *bci;
 696         int ret;
 697         u32 reg;
 698
 699         if (pdata == NULL) {
 700                 dev_err(&pdev->dev, "No platform data\n");
 701                 return -EINVAL;
 702         }
 703
 704         bci = kzalloc(sizeof(*bci), GFP_KERNEL);
 705         if (bci == NULL)
 706                 return -ENOMEM;
 707
 708         bci->dev = &pdev->dev;
 709         bci->irq_chg = platform_get_irq(pdev, 0);
 710         bci->irq_bci = platform_get_irq(pdev, 1);
 711         bci->ac_current = 860; /* ~1.2A */
 712         bci->usb_current = 360; /* ~600mA */
 713
 714         platform_set_drvdata(pdev, bci);
 715
 716         ratelimit_state_init(&bci->ratelimit, HZ, 2);
 717
 718         bci->ac.name = "twl4030_ac";
 719         bci->ac.type = POWER_SUPPLY_TYPE_MAINS;
 720         bci->ac.properties = twl4030_charger_props;
 721         bci->ac.num_properties = ARRAY_SIZE(twl4030_charger_props);
 722         bci->ac.get_property = twl4030_bci_get_property;
 723         bci->ac.supplied_to = pdata->supplied_to;
 724         bci->ac.num_supplicants = pdata->num_supplicants;
 725
 726         ret = power_supply_register(&pdev->dev, &bci->ac);
 727         if (ret) {
 728                 dev_err(&pdev->dev, "failed to register ac: %d\n", ret);
 729                 goto fail_register_ac;
 730         }
 731
 732         bci->usb.name = "twl4030_usb";
 733         bci->usb.type = POWER_SUPPLY_TYPE_USB;
 734         bci->usb.properties = twl4030_charger_props;
 735         bci->usb.num_properties = ARRAY_SIZE(twl4030_charger_props);
 736         bci->usb.get_property = twl4030_bci_get_property;
 737         bci->usb.supplied_to = pdata->supplied_to;
 738         bci->usb.num_supplicants = pdata->num_supplicants;
 739
 740         bci->usb_reg = regulator_get(bci->dev, "bci3v1");
 741         if (IS_ERR(bci->usb_reg)) {
 742                 dev_warn(&pdev->dev, "regulator get bci3v1 failed\n");
 743                 bci->usb_reg = NULL;
 744         }
 745
 746         ret = power_supply_register(&pdev->dev, &bci->usb);
 747         if (ret) {
 748                 dev_err(&pdev->dev, "failed to register usb: %d\n", ret);
 749                 goto fail_register_usb;
 750         }
 751
 752         ret = request_threaded_irq(bci->irq_chg, NULL,
 753                         twl4030_charger_interrupt, 0, pdev->name, bci);
 754         if (ret < 0) {
 755                 dev_err(&pdev->dev, "could not request irq %d, status %d\n",
 756                         bci->irq_chg, ret);
 757                 goto fail_chg_irq;
 758         }
 759
 760         ret = request_threaded_irq(bci->irq_bci, NULL,
 761                         twl4030_bci_interrupt, 0, pdev->name, bci);
 762         if (ret < 0) {
 763                 dev_err(&pdev->dev, "could not request irq %d, status %d\n",
 764                         bci->irq_bci, ret);
 765                 goto fail_bci_irq;
 766         }
 767
 768         INIT_WORK(&bci->work, twl4030_bci_usb_work);
 769
 770         bci->transceiver = otg_get_transceiver();
 771         if (bci->transceiver != NULL) {
 772                 bci->otg_nb.notifier_call = twl4030_bci_usb_ncb;
 773                 otg_register_notifier(bci->transceiver, &bci->otg_nb);
 774         }
 775
 776         ret = sysfs_create_group(&bci->ac.dev->kobj, &bci_ac_attr_group);
 777         if (ret) {
 778                 dev_err(&pdev->dev, "failed to create sysfs group: %d\n", ret);
 779                 goto fail_sysfs1;
 780         }
 781
 782         ret = sysfs_create_group(&bci->usb.dev->kobj, &bci_usb_attr_group);
 783         if (ret) {
 784                 dev_err(&pdev->dev, "failed to create sysfs group: %d\n", ret);
 785                 goto fail_sysfs2;
 786         }
 787
 788         /* Enable interrupts now. */
 789         reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_ICHGEOC | TWL4030_TBATOR2 |
 790                 TWL4030_TBATOR1 | TWL4030_BATSTS);
 791         ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
 792                                TWL4030_INTERRUPTS_BCIIMR1A);
 793         if (ret < 0) {
 794                 dev_err(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
 795                 goto fail_unmask_interrupts;
 796         }
 797
 798         reg = ~(u32)(TWL4030_VBATOV | TWL4030_VBUSOV | TWL4030_ACCHGOV);
 799         ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
 800                                TWL4030_INTERRUPTS_BCIIMR2A);
 801         if (ret < 0)
 802                 dev_warn(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
 803
 804         bci->ac_charge_enable = true;
 805         bci->usb_charge_enable = true;
 806         twl4030_charger_enable_ac(true);
 807         twl4030_charger_enable_usb(bci, true);
 808
 809         return 0;
 810
 811 fail_unmask_interrupts:
 812         sysfs_remove_group(&bci->usb.dev->kobj, &bci_usb_attr_group);
 813 fail_sysfs2:
 814         sysfs_remove_group(&bci->ac.dev->kobj, &bci_ac_attr_group);
 815 fail_sysfs1:
 816         if (bci->transceiver != NULL) {
 817                 otg_unregister_notifier(bci->transceiver, &bci->otg_nb);
 818                 otg_put_transceiver(bci->transceiver);
 819         }
 820         free_irq(bci->irq_bci, bci);
 821 fail_bci_irq:
 822         free_irq(bci->irq_chg, bci);
 823 fail_chg_irq:
 824         power_supply_unregister(&bci->usb);
 825 fail_register_usb:
 826         power_supply_unregister(&bci->ac);
 827 fail_register_ac:
 828         platform_set_drvdata(pdev, NULL);
 829         kfree(bci);
 830
 831         return ret;
 832 }
 833
 834 static int __exit twl4030_bci_remove(struct platform_device *pdev)
 835 {
 836         struct twl4030_bci *bci = platform_get_drvdata(pdev);
 837
 838         sysfs_remove_group(&bci->usb.dev->kobj, &bci_usb_attr_group);
 839         sysfs_remove_group(&bci->ac.dev->kobj, &bci_ac_attr_group);
 840
 841         twl4030_charger_enable_ac(false);
 842         twl4030_charger_enable_usb(bci, false);
 843
 844         /* mask interrupts */
 845         twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
 846                          TWL4030_INTERRUPTS_BCIIMR1A);
 847         twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
 848                          TWL4030_INTERRUPTS_BCIIMR2A);
 849
 850         if (bci->transceiver != NULL) {
 851                 otg_unregister_notifier(bci->transceiver, &bci->otg_nb);
 852                 otg_put_transceiver(bci->transceiver);
 853         }
 854         free_irq(bci->irq_bci, bci);
 855         free_irq(bci->irq_chg, bci);
 856         power_supply_unregister(&bci->usb);
 857         power_supply_unregister(&bci->ac);
 858         platform_set_drvdata(pdev, NULL);
 859         kfree(bci);
 860
 861         return 0;
 862 }
 863
 864 static struct platform_driver twl4030_bci_driver = {
 865         .driver = {
 866                 .name   = "twl4030_bci",
 867                 .owner  = THIS_MODULE,
 868         },
 869         .remove = __exit_p(twl4030_bci_remove),
 870 };
 871
 872 static int __init twl4030_bci_init(void)
 873 {
 874         return platform_driver_probe(&twl4030_bci_driver, twl4030_bci_probe);
 875 }
 876 module_init(twl4030_bci_init);
 877
 878 static void __exit twl4030_bci_exit(void)
 879 {
 880         platform_driver_unregister(&twl4030_bci_driver);
 881 }
 882 module_exit(twl4030_bci_exit);
 883
 884 MODULE_AUTHOR("Gražvydas Ignotas");
 885 MODULE_DESCRIPTION("TWL4030 Battery Charger Interface driver");
 886 MODULE_LICENSE("GPL");
 887 MODULE_ALIAS("platform:twl4030_bci");