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
  26 #define TWL4030_BCIMSTATEC      0x02
  27 #define TWL4030_BCIICHG         0x08
  28 #define TWL4030_BCIVAC          0x0a
  29 #define TWL4030_BCIVBUS         0x0c
  30 #define TWL4030_BCIMFSTS4       0x10
  31 #define TWL4030_BCIMFKEY        0x11
  32 #define TWL4030_BCICTL1         0x23
  33 #define TWL4030_BCIIREF1        0x27
  34 #define TWL4030_BCIIREF2        0x28
  35
  36 #define TWL4030_BCIAUTOWEN      BIT(5)
  37 #define TWL4030_CONFIG_DONE     BIT(4)
  38 #define TWL4030_BCIAUTOUSB      BIT(1)
  39 #define TWL4030_BCIAUTOAC       BIT(0)
  40 #define TWL4030_CGAIN           BIT(5)
  41 #define TWL4030_USBFASTMCHG     BIT(2)
  42 #define TWL4030_STS_VBUS        BIT(7)
  43 #define TWL4030_STS_USB_ID      BIT(2)
  44
  45 /* BCI interrupts */
  46 #define TWL4030_WOVF            BIT(0) /* Watchdog overflow */
  47 #define TWL4030_TMOVF           BIT(1) /* Timer overflow */
  48 #define TWL4030_ICHGHIGH        BIT(2) /* Battery charge current high */
  49 #define TWL4030_ICHGLOW         BIT(3) /* Battery cc. low / FSM state change */
  50 #define TWL4030_ICHGEOC         BIT(4) /* Battery current end-of-charge */
  51 #define TWL4030_TBATOR2         BIT(5) /* Battery temperature out of range 2 */
  52 #define TWL4030_TBATOR1         BIT(6) /* Battery temperature out of range 1 */
  53 #define TWL4030_BATSTS          BIT(7) /* Battery status */
  54
  55 #define TWL4030_VBATLVL         BIT(0) /* VBAT level */
  56 #define TWL4030_VBATOV          BIT(1) /* VBAT overvoltage */
  57 #define TWL4030_VBUSOV          BIT(2) /* VBUS overvoltage */
  58 #define TWL4030_ACCHGOV         BIT(3) /* Ac charger overvoltage */
  59
  60 #define TWL4030_MSTATEC_USB             BIT(4)
  61 #define TWL4030_MSTATEC_AC              BIT(5)
  62 #define TWL4030_MSTATEC_MASK            0x0f
  63 #define TWL4030_MSTATEC_QUICK1          0x02
  64 #define TWL4030_MSTATEC_QUICK7          0x07
  65 #define TWL4030_MSTATEC_COMPLETE1       0x0b
  66 #define TWL4030_MSTATEC_COMPLETE4       0x0e
  67
  68 #define TWL4030_KEY_IIREF               0xe7
  69
  70 static bool allow_usb = 1;
  71 module_param(allow_usb, bool, 0644);
  72 MODULE_PARM_DESC(allow_usb, "Allow USB charge drawing default current");
  73
  74 struct twl4030_bci {
  75         struct device           *dev;
  76         struct power_supply     ac;
  77         struct power_supply     usb;
  78         struct otg_transceiver  *transceiver;
  79         struct notifier_block   otg_nb;
  80         struct work_struct      work;
  81         int                     irq_chg;
  82         int                     irq_bci;
  83         bool                    ac_charge_enable;
  84         bool                    usb_charge_enable;
  85         int                     usb_current;
  86         int                     ac_current;
  87         enum power_supply_type  current_supply;
  88
  89         unsigned long           event;
  90         struct ratelimit_state  ratelimit;
  91 };
  92
  93 /*
  94  * clear and set bits on an given register on a given module
  95  */
  96 static int twl4030_clear_set(u8 mod_no, u8 clear, u8 set, u8 reg)
  97 {
  98         u8 val = 0;
  99         int ret;
 100
 101         ret = twl_i2c_read_u8(mod_no, &val, reg);
 102         if (ret)
 103                 return ret;
 104
 105         val &= ~clear;
 106         val |= set;
 107
 108         return twl_i2c_write_u8(mod_no, val, reg);
 109 }
 110
 111 static int twl4030_bci_read(u8 reg, u8 *val)
 112 {
 113         return twl_i2c_read_u8(TWL4030_MODULE_MAIN_CHARGE, val, reg);
 114 }
 115
 116 static int twl4030_bci_write(u8 reg, u8 val)
 117 {
 118         return twl_i2c_write_u8(TWL4030_MODULE_MAIN_CHARGE, val, reg);
 119 }
 120
 121 static int twl4030_clear_set_boot_bci(u8 clear, u8 set)
 122 {
 123         return twl4030_clear_set(TWL4030_MODULE_PM_MASTER, clear,
 124                         TWL4030_CONFIG_DONE | TWL4030_BCIAUTOWEN | set,
 125                         TWL4030_PM_MASTER_BOOT_BCI);
 126 }
 127
 128 static int twl4030bci_read_adc_val(u8 reg)
 129 {
 130         int ret, temp;
 131         u8 val;
 132
 133         /* read MSB */
 134         ret = twl4030_bci_read(reg + 1, &val);
 135         if (ret)
 136                 return ret;
 137
 138         temp = (int)(val & 0x03) << 8;
 139
 140         /* read LSB */
 141         ret = twl4030_bci_read(reg, &val);
 142         if (ret)
 143                 return ret;
 144
 145         return temp | val;
 146 }
 147
 148 /*
 149  * Check if VBUS power is present
 150  */
 151 static int twl4030_bci_have_vbus(struct twl4030_bci *bci)
 152 {
 153         int ret;
 154         u8 hwsts;
 155
 156         ret = twl_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &hwsts,
 157                               TWL4030_PM_MASTER_STS_HW_CONDITIONS);
 158         if (ret < 0)
 159                 return 0;
 160
 161         dev_dbg(bci->dev, "check_vbus: HW_CONDITIONS %02x\n", hwsts);
 162
 163         /* in case we also have STS_USB_ID, VBUS is driven by TWL itself */
 164         if ((hwsts & TWL4030_STS_VBUS) && !(hwsts & TWL4030_STS_USB_ID))
 165                 return 1;
 166
 167         return 0;
 168 }
 169
 170 /*
 171  * Enable/Disable USB Charge functionality.
 172  */
 173 static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
 174 {
 175         int ret;
 176
 177         if (enable) {
 178                 if (!bci->usb_charge_enable)
 179                         return -EACCES;
 180
 181                 /* Check for USB charger conneted */
 182                 if (!twl4030_bci_have_vbus(bci))
 183                         return -ENODEV;
 184
 185                 /*
 186                  * Until we can find out what current the device can provide,
 187                  * require a module param to enable USB charging.
 188                  */
 189                 if (!allow_usb) {
 190                         dev_warn(bci->dev, "USB charging is disabled.\n");
 191                         return -EACCES;
 192                 }
 193
 194                 /* forcing the field BCIAUTOUSB (BOOT_BCI[1]) to 1 */
 195                 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOUSB);
 196                 if (ret < 0)
 197                         return ret;
 198
 199                 /* forcing USBFASTMCHG(BCIMFSTS4[2]) to 1 */
 200                 ret = twl4030_clear_set(TWL4030_MODULE_MAIN_CHARGE, 0,
 201                         TWL4030_USBFASTMCHG, TWL4030_BCIMFSTS4);
 202         } else {
 203                 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOUSB, 0);
 204         }
 205
 206         return ret;
 207 }
 208
 209 /*
 210  * Enable/Disable AC Charge funtionality.
 211  */
 212 static int twl4030_charger_enable_ac(bool enable)
 213 {
 214         int ret;
 215
 216         if (enable)
 217                 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOAC);
 218         else
 219                 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC, 0);
 220
 221         return ret;
 222 }
 223
 224 static int set_charge_current(struct twl4030_bci *bci, int new_current)
 225 {
 226         u8 tmp, boot_bci_prev, cgain_set, cgain_clear;
 227         int ret;
 228
 229         ret = twl_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &boot_bci_prev,
 230                 TWL4030_PM_MASTER_BOOT_BCI);
 231         if (ret)
 232                 goto out;
 233
 234         /*
 235          * Stop automatic charging here, because charge current change
 236          * requires multiple register writes and CGAIN change requires
 237          * automatic charge to be stopped.
 238          */
 239         ret = twl4030_clear_set_boot_bci(
 240                 TWL4030_BCIAUTOAC | TWL4030_BCIAUTOUSB | 4, 0);
 241         if (ret)
 242                 goto out;
 243
 244         ret = twl4030_bci_write(TWL4030_BCIMFKEY, TWL4030_KEY_IIREF);
 245         if (ret)
 246                 goto out;
 247
 248         ret = twl4030_bci_write(TWL4030_BCIIREF1, new_current & 0xff);
 249         if (ret)
 250                 goto out;
 251
 252         ret = twl4030_bci_write(TWL4030_BCIMFKEY, TWL4030_KEY_IIREF);
 253         if (ret)
 254                 goto out;
 255
 256         ret = twl4030_bci_write(TWL4030_BCIIREF2, (new_current >> 8) & 0x1);
 257         if (ret)
 258                 goto out;
 259
 260         /* Set CGAIN = 0 or 1 */
 261         if (new_current > 511) {
 262                 cgain_set = TWL4030_CGAIN;
 263                 cgain_clear = 0;
 264         } else {
 265                 cgain_set = 0;
 266                 cgain_clear = TWL4030_CGAIN;
 267         }
 268
 269         ret = twl4030_clear_set(TWL4030_MODULE_MAIN_CHARGE,
 270                         cgain_clear, cgain_set, TWL4030_BCICTL1);
 271         if (ret)
 272                 goto out;
 273
 274         ret = twl4030_bci_read(TWL4030_BCICTL1, &tmp);
 275         if (ret != 0 || (tmp & TWL4030_CGAIN) != cgain_set) {
 276                 dev_err(bci->dev, "CGAIN change failed\n");
 277                 goto out;
 278         }
 279
 280         ret = twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER, boot_bci_prev,
 281                 TWL4030_PM_MASTER_BOOT_BCI);
 282 out:
 283         if (ret != 0)
 284                 dev_err(bci->dev, "charge current change failed\n");
 285
 286         return ret;
 287 }
 288
 289 /*
 290  * TWL4030 CHG_PRES (AC charger presence) events
 291  */
 292 static irqreturn_t twl4030_charger_interrupt(int irq, void *arg)
 293 {
 294         struct twl4030_bci *bci = arg;
 295
 296         dev_dbg(bci->dev, "CHG_PRES irq\n");
 297         power_supply_changed(&bci->ac);
 298         power_supply_changed(&bci->usb);
 299
 300         return IRQ_HANDLED;
 301 }
 302
 303 /*
 304  * TWL4030 BCI monitoring events
 305  */
 306 static irqreturn_t twl4030_bci_interrupt(int irq, void *arg)
 307 {
 308         struct twl4030_bci *bci = arg;
 309         u8 irqs1, irqs2;
 310         int ret;
 311
 312         ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs1,
 313                               TWL4030_INTERRUPTS_BCIISR1A);
 314         if (ret < 0)
 315                 return IRQ_HANDLED;
 316
 317         ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs2,
 318                               TWL4030_INTERRUPTS_BCIISR2A);
 319         if (ret < 0)
 320                 return IRQ_HANDLED;
 321
 322         dev_dbg(bci->dev, "BCI irq %02x %02x\n", irqs2, irqs1);
 323
 324         if (irqs1 & (TWL4030_ICHGLOW | TWL4030_ICHGEOC)) {
 325                 /* charger state change, inform the core */
 326                 power_supply_changed(&bci->ac);
 327                 power_supply_changed(&bci->usb);
 328         }
 329
 330         /* various monitoring events, for now we just log them here */
 331         if (irqs1 & (TWL4030_TBATOR2 | TWL4030_TBATOR1) &&
 332                         __ratelimit(&bci->ratelimit))
 333                 dev_warn(bci->dev, "battery temperature out of range\n");
 334
 335         if (irqs1 & TWL4030_BATSTS && __ratelimit(&bci->ratelimit))
 336                 dev_crit(bci->dev, "battery disconnected\n");
 337
 338         if (irqs2 & TWL4030_VBATOV && __ratelimit(&bci->ratelimit))
 339                 dev_crit(bci->dev, "VBAT overvoltage\n");
 340
 341         if (irqs2 & TWL4030_VBUSOV && __ratelimit(&bci->ratelimit))
 342                 dev_crit(bci->dev, "VBUS overvoltage\n");
 343
 344         if (irqs2 & TWL4030_ACCHGOV && __ratelimit(&bci->ratelimit))
 345                 dev_crit(bci->dev, "Ac charger overvoltage\n");
 346
 347         /* ack the interrupts */
 348         twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, irqs1,
 349                          TWL4030_INTERRUPTS_BCIISR1A);
 350         twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, irqs2,
 351                          TWL4030_INTERRUPTS_BCIISR2A);
 352
 353         return IRQ_HANDLED;
 354 }
 355
 356 static void twl4030_bci_usb_work(struct work_struct *data)
 357 {
 358         struct twl4030_bci *bci = container_of(data, struct twl4030_bci, work);
 359
 360         switch (bci->event) {
 361         case USB_EVENT_VBUS:
 362         case USB_EVENT_CHARGER:
 363                 twl4030_charger_enable_usb(bci, true);
 364                 break;
 365         case USB_EVENT_NONE:
 366                 twl4030_charger_enable_usb(bci, false);
 367                 break;
 368         }
 369 }
 370
 371 static int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val,
 372                                void *priv)
 373 {
 374         struct twl4030_bci *bci = container_of(nb, struct twl4030_bci, otg_nb);
 375
 376         dev_dbg(bci->dev, "OTG notify %lu\n", val);
 377
 378         bci->event = val;
 379         schedule_work(&bci->work);
 380
 381         return NOTIFY_OK;
 382 }
 383
 384 /*
 385  * TI provided formulas:
 386  * CGAIN == 0: ICHG = (BCIICHG * 1.7) / (2^10 - 1) - 0.85
 387  * CGAIN == 1: ICHG = (BCIICHG * 3.4) / (2^10 - 1) - 1.7
 388  * Here we use integer approximation of:
 389  * CGAIN == 0: val * 1.6618 - 0.85
 390  * CGAIN == 1: (val * 1.6618 - 0.85) * 2
 391  */
 392 static int twl4030_charger_get_current(void)
 393 {
 394         int curr;
 395         int ret;
 396         u8 bcictl1;
 397
 398         curr = twl4030bci_read_adc_val(TWL4030_BCIICHG);
 399         if (curr < 0)
 400                 return curr;
 401
 402         ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
 403         if (ret)
 404                 return ret;
 405
 406         ret = (curr * 16618 - 850 * 10000) / 10;
 407         if (bcictl1 & TWL4030_CGAIN)
 408                 ret *= 2;
 409
 410         return ret;
 411 }
 412
 413 static ssize_t twl4030_bci_ac_show_enable(struct device *dev,
 414                                           struct device_attribute *attr,
 415                                           char *buf)
 416 {
 417         u8 boot_bci;
 418         int ret;
 419
 420         ret = twl_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &boot_bci,
 421                               TWL4030_PM_MASTER_BOOT_BCI);
 422         if (ret)
 423                 return ret;
 424
 425         return sprintf(buf, "%d\n", (boot_bci & TWL4030_BCIAUTOAC) ? 1 : 0);
 426 }
 427
 428 static ssize_t twl4030_bci_ac_store_enable(struct device *dev,
 429                                            struct device_attribute *attr,
 430                                            const char *buf, size_t count)
 431 {
 432         struct power_supply *psy = dev_get_drvdata(dev);
 433         struct twl4030_bci *bci = container_of(psy, struct twl4030_bci, ac);
 434         unsigned long enable;
 435         int ret;
 436
 437         ret = strict_strtoul(buf, 10, &enable);
 438         if (ret || enable > 1)
 439                 return -EINVAL;
 440
 441         bci->ac_charge_enable = enable;
 442         twl4030_charger_enable_ac(enable);
 443
 444         return count;
 445 }
 446 static struct device_attribute dev_attr_enable_ac =
 447         __ATTR(enable, S_IRUGO | S_IWUSR, twl4030_bci_ac_show_enable,
 448         twl4030_bci_ac_store_enable);
 449
 450 static ssize_t twl4030_bci_usb_show_enable(struct device *dev,
 451                                            struct device_attribute *attr,
 452                                            char *buf)
 453 {
 454         u8 boot_bci;
 455         int ret;
 456
 457         ret = twl_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &boot_bci,
 458                               TWL4030_PM_MASTER_BOOT_BCI);
 459         if (ret)
 460                 return ret;
 461
 462         return sprintf(buf, "%d\n", (boot_bci & TWL4030_BCIAUTOUSB) ? 1 : 0);
 463 }
 464
 465 static ssize_t twl4030_bci_usb_store_enable(struct device *dev,
 466                                             struct device_attribute *attr,
 467                                             const char *buf, size_t count)
 468 {
 469         struct power_supply *psy = dev_get_drvdata(dev);
 470         struct twl4030_bci *bci = container_of(psy, struct twl4030_bci, usb);
 471         unsigned long enable;
 472         int ret;
 473
 474         ret = strict_strtoul(buf, 10, &enable);
 475         if (ret || enable > 1)
 476                 return -EINVAL;
 477
 478         bci->usb_charge_enable = enable;
 479         twl4030_charger_enable_usb(bci, enable);
 480
 481         return count;
 482 }
 483 static struct device_attribute dev_attr_enable_usb =
 484         __ATTR(enable, S_IRUGO | S_IWUSR, twl4030_bci_usb_show_enable,
 485         twl4030_bci_usb_store_enable);
 486
 487 static ssize_t show_charge_current(struct device *dev,
 488                         struct device_attribute *attr, char *buf)
 489 {
 490         int ret, val;
 491         u8 ctl;
 492
 493         val = twl4030bci_read_adc_val(TWL4030_BCIIREF1);
 494         if (val < 0)
 495                 return val;
 496         ret = twl4030_bci_read(TWL4030_BCICTL1, &ctl);
 497         if (ret < 0)
 498                 return ret;
 499
 500         val &= 0x1ff;
 501         if (ctl & TWL4030_CGAIN)
 502                 val |= 0x200;
 503
 504         return sprintf(buf, "%d\n", val);
 505 }
 506
 507 static ssize_t store_charge_current(struct device *dev,
 508                         struct device_attribute *attr, const char *buf,
 509                         size_t count)
 510 {
 511         struct power_supply *psy = dev_get_drvdata(dev);
 512         struct twl4030_bci *bci = dev_get_drvdata(psy->dev->parent);
 513         unsigned long new_current;
 514         int ret;
 515
 516         ret = strict_strtoul(buf, 10, &new_current);
 517         if (ret)
 518                 return -EINVAL;
 519
 520         ret = set_charge_current(bci, new_current);
 521         if (ret)
 522                 return ret;
 523
 524         if (bci->current_supply == POWER_SUPPLY_TYPE_MAINS)
 525                 bci->ac_current = new_current;
 526         else
 527                 bci->usb_current = new_current;
 528
 529         return count;
 530 }
 531 static DEVICE_ATTR(charge_current, S_IRUGO | S_IWUSR, show_charge_current,
 532         store_charge_current);
 533
 534 static struct attribute *bci_ac_attrs[] = {
 535         &dev_attr_enable_ac.attr,
 536         &dev_attr_charge_current.attr,
 537         NULL,
 538 };
 539
 540 static struct attribute *bci_usb_attrs[] = {
 541         &dev_attr_enable_usb.attr,
 542         &dev_attr_charge_current.attr,
 543         NULL,
 544 };
 545
 546 static const struct attribute_group bci_ac_attr_group = {
 547         .attrs = bci_ac_attrs,
 548 };
 549
 550 static const struct attribute_group bci_usb_attr_group = {
 551         .attrs = bci_usb_attrs,
 552 };
 553
 554 /*
 555  * Returns the main charge FSM state
 556  * Or < 0 on failure.
 557  */
 558 static int twl4030bci_state(struct twl4030_bci *bci)
 559 {
 560         int ret;
 561         u8 state;
 562
 563         ret = twl4030_bci_read(TWL4030_BCIMSTATEC, &state);
 564         if (ret) {
 565                 pr_err("twl4030_bci: error reading BCIMSTATEC\n");
 566                 return ret;
 567         }
 568
 569         dev_dbg(bci->dev, "state: %02x\n", state);
 570
 571         return state;
 572 }
 573
 574 static int twl4030_bci_state_to_status(int state)
 575 {
 576         state &= TWL4030_MSTATEC_MASK;
 577         if (TWL4030_MSTATEC_QUICK1 <= state && state <= TWL4030_MSTATEC_QUICK7)
 578                 return POWER_SUPPLY_STATUS_CHARGING;
 579         else if (TWL4030_MSTATEC_COMPLETE1 <= state &&
 580                                         state <= TWL4030_MSTATEC_COMPLETE4)
 581                 return POWER_SUPPLY_STATUS_FULL;
 582         else
 583                 return POWER_SUPPLY_STATUS_NOT_CHARGING;
 584 }
 585
 586 static int twl4030_bci_get_property(struct power_supply *psy,
 587                                     enum power_supply_property psp,
 588                                     union power_supply_propval *val)
 589 {
 590         struct twl4030_bci *bci = dev_get_drvdata(psy->dev->parent);
 591         int is_charging;
 592         int state;
 593         int ret;
 594
 595         state = twl4030bci_state(bci);
 596         if (state < 0)
 597                 return state;
 598
 599         if (psy->type == POWER_SUPPLY_TYPE_USB)
 600                 is_charging = state & TWL4030_MSTATEC_USB;
 601         else
 602                 is_charging = state & TWL4030_MSTATEC_AC;
 603         if (is_charging && psy->type != bci->current_supply) {
 604                 if (psy->type == POWER_SUPPLY_TYPE_USB)
 605                         set_charge_current(bci, bci->usb_current);
 606                 else
 607                         set_charge_current(bci, bci->ac_current);
 608                 bci->current_supply = psy->type;
 609         }
 610
 611         switch (psp) {
 612         case POWER_SUPPLY_PROP_STATUS:
 613                 if (is_charging)
 614                         val->intval = twl4030_bci_state_to_status(state);
 615                 else
 616                         val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
 617                 break;
 618         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 619                 /* charging must be active for meaningful result */
 620                 if (!is_charging)
 621                         return -ENODATA;
 622                 if (psy->type == POWER_SUPPLY_TYPE_USB) {
 623                         ret = twl4030bci_read_adc_val(TWL4030_BCIVBUS);
 624                         if (ret < 0)
 625                                 return ret;
 626                         /* BCIVBUS uses ADCIN8, 7/1023 V/step */
 627                         val->intval = ret * 6843;
 628                 } else {
 629                         ret = twl4030bci_read_adc_val(TWL4030_BCIVAC);
 630                         if (ret < 0)
 631                                 return ret;
 632                         /* BCIVAC uses ADCIN11, 10/1023 V/step */
 633                         val->intval = ret * 9775;
 634                 }
 635                 break;
 636         case POWER_SUPPLY_PROP_CURRENT_NOW:
 637                 if (!is_charging)
 638                         return -ENODATA;
 639                 /* current measurement is shared between AC and USB */
 640                 ret = twl4030_charger_get_current();
 641                 if (ret < 0)
 642                         return ret;
 643                 val->intval = ret;
 644                 break;
 645         case POWER_SUPPLY_PROP_ONLINE:
 646                 val->intval = is_charging &&
 647                         twl4030_bci_state_to_status(state) !=
 648                                 POWER_SUPPLY_STATUS_NOT_CHARGING;
 649                 break;
 650         default:
 651                 return -EINVAL;
 652         }
 653
 654         return 0;
 655 }
 656
 657 static enum power_supply_property twl4030_charger_props[] = {
 658         POWER_SUPPLY_PROP_STATUS,
 659         POWER_SUPPLY_PROP_ONLINE,
 660         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 661         POWER_SUPPLY_PROP_CURRENT_NOW,
 662 };
 663
 664 static int __init twl4030_bci_probe(struct platform_device *pdev)
 665 {
 666         const struct twl4030_bci_platform_data *pdata = pdev->dev.platform_data;
 667         struct twl4030_bci *bci;
 668         int ret;
 669         u32 reg;
 670
 671         if (pdata == NULL) {
 672                 dev_err(&pdev->dev, "No platform data\n");
 673                 return -EINVAL;
 674         }
 675
 676         bci = kzalloc(sizeof(*bci), GFP_KERNEL);
 677         if (bci == NULL)
 678                 return -ENOMEM;
 679
 680         bci->dev = &pdev->dev;
 681         bci->irq_chg = platform_get_irq(pdev, 0);
 682         bci->irq_bci = platform_get_irq(pdev, 1);
 683         bci->ac_current = 860; /* ~1.2A */
 684         bci->usb_current = 360; /* ~600mA */
 685
 686         platform_set_drvdata(pdev, bci);
 687
 688         ratelimit_state_init(&bci->ratelimit, HZ, 2);
 689
 690         bci->ac.name = "twl4030_ac";
 691         bci->ac.type = POWER_SUPPLY_TYPE_MAINS;
 692         bci->ac.properties = twl4030_charger_props;
 693         bci->ac.num_properties = ARRAY_SIZE(twl4030_charger_props);
 694         bci->ac.get_property = twl4030_bci_get_property;
 695         bci->ac.supplied_to = pdata->supplied_to;
 696         bci->ac.num_supplicants = pdata->num_supplicants;
 697
 698         ret = power_supply_register(&pdev->dev, &bci->ac);
 699         if (ret) {
 700                 dev_err(&pdev->dev, "failed to register ac: %d\n", ret);
 701                 goto fail_register_ac;
 702         }
 703
 704         bci->usb.name = "twl4030_usb";
 705         bci->usb.type = POWER_SUPPLY_TYPE_USB;
 706         bci->usb.properties = twl4030_charger_props;
 707         bci->usb.num_properties = ARRAY_SIZE(twl4030_charger_props);
 708         bci->usb.get_property = twl4030_bci_get_property;
 709         bci->usb.supplied_to = pdata->supplied_to;
 710         bci->usb.num_supplicants = pdata->num_supplicants;
 711
 712         ret = power_supply_register(&pdev->dev, &bci->usb);
 713         if (ret) {
 714                 dev_err(&pdev->dev, "failed to register usb: %d\n", ret);
 715                 goto fail_register_usb;
 716         }
 717
 718         ret = request_threaded_irq(bci->irq_chg, NULL,
 719                         twl4030_charger_interrupt, 0, pdev->name, bci);
 720         if (ret < 0) {
 721                 dev_err(&pdev->dev, "could not request irq %d, status %d\n",
 722                         bci->irq_chg, ret);
 723                 goto fail_chg_irq;
 724         }
 725
 726         ret = request_threaded_irq(bci->irq_bci, NULL,
 727                         twl4030_bci_interrupt, 0, pdev->name, bci);
 728         if (ret < 0) {
 729                 dev_err(&pdev->dev, "could not request irq %d, status %d\n",
 730                         bci->irq_bci, ret);
 731                 goto fail_bci_irq;
 732         }
 733
 734         INIT_WORK(&bci->work, twl4030_bci_usb_work);
 735
 736         bci->transceiver = otg_get_transceiver();
 737         if (bci->transceiver != NULL) {
 738                 bci->otg_nb.notifier_call = twl4030_bci_usb_ncb;
 739                 otg_register_notifier(bci->transceiver, &bci->otg_nb);
 740         }
 741
 742         ret = sysfs_create_group(&bci->ac.dev->kobj, &bci_ac_attr_group);
 743         if (ret) {
 744                 dev_err(&pdev->dev, "failed to create sysfs group: %d\n", ret);
 745                 goto fail_sysfs1;
 746         }
 747
 748         ret = sysfs_create_group(&bci->usb.dev->kobj, &bci_usb_attr_group);
 749         if (ret) {
 750                 dev_err(&pdev->dev, "failed to create sysfs group: %d\n", ret);
 751                 goto fail_sysfs2;
 752         }
 753
 754         /* Enable interrupts now. */
 755         reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_ICHGEOC | TWL4030_TBATOR2 |
 756                 TWL4030_TBATOR1 | TWL4030_BATSTS);
 757         ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
 758                                TWL4030_INTERRUPTS_BCIIMR1A);
 759         if (ret < 0) {
 760                 dev_err(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
 761                 goto fail_unmask_interrupts;
 762         }
 763
 764         reg = ~(u32)(TWL4030_VBATOV | TWL4030_VBUSOV | TWL4030_ACCHGOV);
 765         ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
 766                                TWL4030_INTERRUPTS_BCIIMR2A);
 767         if (ret < 0)
 768                 dev_warn(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
 769
 770         bci->ac_charge_enable = true;
 771         bci->usb_charge_enable = true;
 772         twl4030_charger_enable_ac(true);
 773         twl4030_charger_enable_usb(bci, true);
 774
 775         return 0;
 776
 777 fail_unmask_interrupts:
 778         sysfs_remove_group(&bci->usb.dev->kobj, &bci_usb_attr_group);
 779 fail_sysfs2:
 780         sysfs_remove_group(&bci->ac.dev->kobj, &bci_ac_attr_group);
 781 fail_sysfs1:
 782         if (bci->transceiver != NULL) {
 783                 otg_unregister_notifier(bci->transceiver, &bci->otg_nb);
 784                 otg_put_transceiver(bci->transceiver);
 785         }
 786         free_irq(bci->irq_bci, bci);
 787 fail_bci_irq:
 788         free_irq(bci->irq_chg, bci);
 789 fail_chg_irq:
 790         power_supply_unregister(&bci->usb);
 791 fail_register_usb:
 792         power_supply_unregister(&bci->ac);
 793 fail_register_ac:
 794         platform_set_drvdata(pdev, NULL);
 795         kfree(bci);
 796
 797         return ret;
 798 }
 799
 800 static int __exit twl4030_bci_remove(struct platform_device *pdev)
 801 {
 802         struct twl4030_bci *bci = platform_get_drvdata(pdev);
 803
 804         sysfs_remove_group(&bci->usb.dev->kobj, &bci_usb_attr_group);
 805         sysfs_remove_group(&bci->ac.dev->kobj, &bci_ac_attr_group);
 806
 807         twl4030_charger_enable_ac(false);
 808         twl4030_charger_enable_usb(bci, false);
 809
 810         /* mask interrupts */
 811         twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
 812                          TWL4030_INTERRUPTS_BCIIMR1A);
 813         twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
 814                          TWL4030_INTERRUPTS_BCIIMR2A);
 815
 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         free_irq(bci->irq_chg, bci);
 822         power_supply_unregister(&bci->usb);
 823         power_supply_unregister(&bci->ac);
 824         platform_set_drvdata(pdev, NULL);
 825         kfree(bci);
 826
 827         return 0;
 828 }
 829
 830 static struct platform_driver twl4030_bci_driver = {
 831         .driver = {
 832                 .name   = "twl4030_bci",
 833                 .owner  = THIS_MODULE,
 834         },
 835         .remove = __exit_p(twl4030_bci_remove),
 836 };
 837
 838 static int __init twl4030_bci_init(void)
 839 {
 840         return platform_driver_probe(&twl4030_bci_driver, twl4030_bci_probe);
 841 }
 842 module_init(twl4030_bci_init);
 843
 844 static void __exit twl4030_bci_exit(void)
 845 {
 846         platform_driver_unregister(&twl4030_bci_driver);
 847 }
 848 module_exit(twl4030_bci_exit);
 849
 850 MODULE_AUTHOR("Gražvydas Ignotas");
 851 MODULE_DESCRIPTION("TWL4030 Battery Charger Interface driver");
 852 MODULE_LICENSE("GPL");
 853 MODULE_ALIAS("platform:twl4030_bci");