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 #include <linux/leds.h>
  27
  28 #define TWL4030_BCIMSTATEC      0x02
  29 #define TWL4030_BCIICHG         0x08
  30 #define TWL4030_BCIVAC          0x0a
  31 #define TWL4030_BCIVBUS         0x0c
  32 #define TWL4030_BCIMFSTS3       0x0f
  33 #define TWL4030_BCIMFSTS4       0x10
  34 #define TWL4030_BCIMFKEY        0x11
  35 #define TWL4030_BCICTL1         0x23
  36 #define TWL4030_BCIIREF1        0x27
  37 #define TWL4030_BCIIREF2        0x28
  38
  39 #define TWL4030_BCIAUTOWEN      BIT(5)
  40 #define TWL4030_CONFIG_DONE     BIT(4)
  41 #define TWL4030_CVENAC          BIT(2)
  42 #define TWL4030_BCIAUTOUSB      BIT(1)
  43 #define TWL4030_BCIAUTOAC       BIT(0)
  44 #define TWL4030_CGAIN           BIT(5)
  45 #define TWL4030_USBFASTMCHG     BIT(2)
  46 #define TWL4030_STS_VBUS        BIT(7)
  47 #define TWL4030_STS_USB_ID      BIT(2)
  48 #define TWL4030_STS_CHG         BIT(1)
  49
  50 /* BCI interrupts */
  51 #define TWL4030_WOVF            BIT(0) /* Watchdog overflow */
  52 #define TWL4030_TMOVF           BIT(1) /* Timer overflow */
  53 #define TWL4030_ICHGHIGH        BIT(2) /* Battery charge current high */
  54 #define TWL4030_ICHGLOW         BIT(3) /* Battery cc. low / FSM state change */
  55 #define TWL4030_ICHGEOC         BIT(4) /* Battery current end-of-charge */
  56 #define TWL4030_TBATOR2         BIT(5) /* Battery temperature out of range 2 */
  57 #define TWL4030_TBATOR1         BIT(6) /* Battery temperature out of range 1 */
  58 #define TWL4030_BATSTS          BIT(7) /* Battery status */
  59
  60 #define TWL4030_VBATLVL         BIT(0) /* VBAT level */
  61 #define TWL4030_VBATOV          BIT(1) /* VBAT overvoltage */
  62 #define TWL4030_VBUSOV          BIT(2) /* VBUS overvoltage */
  63 #define TWL4030_ACCHGOV         BIT(3) /* Ac charger overvoltage */
  64
  65 #define TWL4030_MSTATEC_USB             BIT(4)
  66 #define TWL4030_MSTATEC_AC              BIT(5)
  67 #define TWL4030_MSTATEC_MASK            0x0f
  68 #define TWL4030_MSTATEC_QUICK1          0x02
  69 #define TWL4030_MSTATEC_QUICK7          0x07
  70 #define TWL4030_MSTATEC_COMPLETE1       0x0b
  71 #define TWL4030_MSTATEC_COMPLETE4       0x0e
  72
  73 #define TWL4030_KEY_IIREF               0xe7
  74 #define TWL4030_BATSTSMCHG              BIT(6)
  75
  76 #define IRQ_CHECK_PERIOD        (3 * HZ)
  77 #define IRQ_CHECK_THRESHOLD     4
  78
  79 static bool allow_usb = 1;
  80 module_param(allow_usb, bool, 0644);
  81 MODULE_PARM_DESC(allow_usb, "Allow USB charge drawing default current");
  82
  83 struct twl4030_bci {
  84         struct device           *dev;
  85         struct power_supply     ac;
  86         struct power_supply     usb;
  87         struct otg_transceiver  *transceiver;
  88         struct notifier_block   otg_nb;
  89         struct work_struct      work;
  90         int                     irq_chg;
  91         int                     irq_bci;
  92         bool                    ac_charge_enable;
  93         bool                    usb_charge_enable;
  94         int                     usb_current;
  95         int                     ac_current;
  96         enum power_supply_type  current_supply;
  97         struct regulator        *usb_reg;
  98         int                     usb_enabled;
  99         int                     irq_had_charger;
 100
 101         unsigned long           irq_check_count_time;
 102         int                     irq_check_count;
 103         int                     irq_check_ac_disabled;
 104
 105         struct led_trigger      *charging_any_trig;
 106         int                     was_charging_any;
 107
 108         unsigned long           event;
 109         struct ratelimit_state  ratelimit;
 110 };
 111
 112 /*
 113  * clear and set bits on an given register on a given module
 114  */
 115 static int twl4030_clear_set(u8 mod_no, u8 clear, u8 set, u8 reg)
 116 {
 117         u8 val = 0;
 118         int ret;
 119
 120         ret = twl_i2c_read_u8(mod_no, &val, reg);
 121         if (ret)
 122                 return ret;
 123
 124         val &= ~clear;
 125         val |= set;
 126
 127         return twl_i2c_write_u8(mod_no, val, reg);
 128 }
 129
 130 static int twl4030_bci_read(u8 reg, u8 *val)
 131 {
 132         return twl_i2c_read_u8(TWL4030_MODULE_MAIN_CHARGE, val, reg);
 133 }
 134
 135 static int twl4030_bci_write(u8 reg, u8 val)
 136 {
 137         return twl_i2c_write_u8(TWL4030_MODULE_MAIN_CHARGE, val, reg);
 138 }
 139
 140 static int twl4030_clear_set_boot_bci(u8 clear, u8 set)
 141 {
 142         return twl4030_clear_set(TWL4030_MODULE_PM_MASTER, clear,
 143                         TWL4030_CONFIG_DONE | TWL4030_BCIAUTOWEN | set,
 144                         TWL4030_PM_MASTER_BOOT_BCI);
 145 }
 146
 147 static int twl4030bci_read_adc_val(u8 reg)
 148 {
 149         int ret, temp;
 150         u8 val;
 151
 152         /* read MSB */
 153         ret = twl4030_bci_read(reg + 1, &val);
 154         if (ret)
 155                 return ret;
 156
 157         temp = (int)(val & 0x03) << 8;
 158
 159         /* read LSB */
 160         ret = twl4030_bci_read(reg, &val);
 161         if (ret)
 162                 return ret;
 163
 164         return temp | val;
 165 }
 166
 167 /*
 168  * Check if VBUS power is present
 169  */
 170 static int twl4030_bci_have_vbus(struct twl4030_bci *bci)
 171 {
 172         int ret;
 173         u8 hwsts;
 174
 175         ret = twl_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &hwsts,
 176                               TWL4030_PM_MASTER_STS_HW_CONDITIONS);
 177         if (ret < 0)
 178                 return 0;
 179
 180         dev_dbg(bci->dev, "check_vbus: HW_CONDITIONS %02x\n", hwsts);
 181
 182         /* in case we also have STS_USB_ID, VBUS is driven by TWL itself */
 183         if ((hwsts & TWL4030_STS_VBUS) && !(hwsts & TWL4030_STS_USB_ID))
 184                 return 1;
 185
 186         return 0;
 187 }
 188
 189 /*
 190  * Enable/Disable USB Charge functionality.
 191  */
 192 static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
 193 {
 194         int ret;
 195
 196         if (enable) {
 197                 if (!bci->usb_charge_enable)
 198                         return -EACCES;
 199
 200                 /* Check for USB charger conneted */
 201                 if (!twl4030_bci_have_vbus(bci))
 202                         return -ENODEV;
 203
 204                 /*
 205                  * Until we can find out what current the device can provide,
 206                  * require a module param to enable USB charging.
 207                  */
 208                 if (!allow_usb) {
 209                         dev_warn(bci->dev, "USB charging is disabled.\n");
 210                         return -EACCES;
 211                 }
 212
 213                 /* Need to keep regulator on */
 214                 if (!bci->usb_enabled &&
 215                     bci->usb_reg &&
 216                     regulator_enable(bci->usb_reg) == 0)
 217                         bci->usb_enabled = 1;
 218
 219                 /* forcing the field BCIAUTOUSB (BOOT_BCI[1]) to 1 */
 220                 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOUSB);
 221                 if (ret < 0)
 222                         return ret;
 223
 224                 /* forcing USBFASTMCHG(BCIMFSTS4[2]) to 1 */
 225                 ret = twl4030_clear_set(TWL4030_MODULE_MAIN_CHARGE, 0,
 226                         TWL4030_USBFASTMCHG, TWL4030_BCIMFSTS4);
 227         } else {
 228                 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOUSB, 0);
 229                 if (bci->usb_enabled &&
 230                     regulator_disable(bci->usb_reg) == 0)
 231                         bci->usb_enabled = 0;
 232         }
 233
 234         return ret;
 235 }
 236
 237 /*
 238  * Enable/Disable AC Charge funtionality.
 239  */
 240 static int twl4030_charger_enable_ac(bool enable)
 241 {
 242         int ret;
 243
 244         if (enable)
 245                 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOAC);
 246         else
 247                 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC, 0);
 248
 249         return ret;
 250 }
 251
 252 static int set_charge_current(struct twl4030_bci *bci, int new_current)
 253 {
 254         u8 val, boot_bci_prev, cgain_set, cgain_clear;
 255         int ret, ret2;
 256
 257         ret = twl4030_bci_read(TWL4030_BCIMFSTS3, &val);
 258         if (ret)
 259                 goto out_norestore;
 260
 261         if (!(val & TWL4030_BATSTSMCHG)) {
 262                 dev_err(bci->dev, "missing battery, can't change charge_current\n");
 263                 goto out_norestore;
 264         }
 265
 266         ret = twl_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &boot_bci_prev,
 267                 TWL4030_PM_MASTER_BOOT_BCI);
 268         if (ret)
 269                 goto out_norestore;
 270
 271         /*
 272          * Stop automatic charging here, because charge current change
 273          * requires multiple register writes and CGAIN change requires
 274          * automatic charge to be stopped (and CV mode disabled too).
 275          */
 276         ret = twl4030_clear_set_boot_bci(
 277                 TWL4030_CVENAC | TWL4030_BCIAUTOAC | TWL4030_BCIAUTOUSB, 0);
 278         if (ret)
 279                 goto out;
 280
 281         ret = twl4030_bci_write(TWL4030_BCIMFKEY, TWL4030_KEY_IIREF);
 282         if (ret)
 283                 goto out;
 284
 285         ret = twl4030_bci_write(TWL4030_BCIIREF1, new_current & 0xff);
 286         if (ret)
 287                 goto out;
 288
 289         ret = twl4030_bci_write(TWL4030_BCIMFKEY, TWL4030_KEY_IIREF);
 290         if (ret)
 291                 goto out;
 292
 293         ret = twl4030_bci_write(TWL4030_BCIIREF2, (new_current >> 8) & 0x1);
 294         if (ret)
 295                 goto out;
 296
 297         /* Set CGAIN = 0 or 1 */
 298         if (new_current > 511) {
 299                 cgain_set = TWL4030_CGAIN;
 300                 cgain_clear = 0;
 301         } else {
 302                 cgain_set = 0;
 303                 cgain_clear = TWL4030_CGAIN;
 304         }
 305
 306         ret = twl4030_clear_set(TWL4030_MODULE_MAIN_CHARGE,
 307                         cgain_clear, cgain_set, TWL4030_BCICTL1);
 308         if (ret)
 309                 goto out;
 310
 311         ret = twl4030_bci_read(TWL4030_BCICTL1, &val);
 312         if (ret != 0 || (val & TWL4030_CGAIN) != cgain_set) {
 313                 dev_err(bci->dev, "CGAIN change failed\n");
 314                 goto out;
 315         }
 316
 317 out:
 318         ret2 = twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER, boot_bci_prev,
 319                 TWL4030_PM_MASTER_BOOT_BCI);
 320         if (ret2 != 0)
 321                 dev_err(bci->dev, "failed boot_bci restore: %d\n", ret2);
 322
 323 out_norestore:
 324         if (ret != 0)
 325                 dev_err(bci->dev, "charge current change failed: %d\n", ret);
 326
 327         return ret;
 328 }
 329
 330 /*
 331  * TWL4030 CHG_PRES (AC charger presence) events
 332  */
 333 static irqreturn_t twl4030_charger_interrupt(int irq, void *arg)
 334 {
 335         struct twl4030_bci *bci = arg;
 336         int have_charger;
 337         u8 hw_cond;
 338         int ret;
 339
 340         ret = twl_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &hw_cond,
 341                               TWL4030_PM_MASTER_STS_HW_CONDITIONS);
 342         if (ret < 0) {
 343                 dev_err(bci->dev, "HW_CONDITIONS read failed: %d\n", ret);
 344                 goto out;
 345         }
 346
 347         have_charger = (hw_cond & TWL4030_STS_CHG) ? 1 : 0;
 348         if (have_charger == bci->irq_had_charger)
 349                 goto out;
 350         bci->irq_had_charger = have_charger;
 351
 352         dev_dbg(bci->dev, "CHG_PRES irq, hw_cond %02x\n", hw_cond);
 353
 354         /*
 355          * deal with rare mysterious issue of CHG_PRES changing states at ~4Hz
 356          * without any charger connected or anything
 357          */
 358         if (time_before(jiffies, bci->irq_check_count_time + IRQ_CHECK_PERIOD)) {
 359                 bci->irq_check_count++;
 360                 if (have_charger && bci->irq_check_count > IRQ_CHECK_THRESHOLD) {
 361                         dev_err(bci->dev, "spurious CHG_PRES irqs detected (%d), disabling charger\n",
 362                                 bci->irq_check_count);
 363                         twl4030_charger_enable_ac(false);
 364                         bci->irq_check_ac_disabled = true;
 365                 }
 366         } else {
 367                 bci->irq_check_count_time = jiffies;
 368                 bci->irq_check_count = 1;
 369                 if (have_charger && bci->irq_check_ac_disabled) {
 370                         twl4030_charger_enable_ac(true);
 371                         bci->irq_check_ac_disabled = false;
 372                 }
 373         }
 374
 375         power_supply_changed(&bci->ac);
 376         power_supply_changed(&bci->usb);
 377
 378 out:
 379         return IRQ_HANDLED;
 380 }
 381
 382 /*
 383  * TWL4030 BCI monitoring events
 384  */
 385 static irqreturn_t twl4030_bci_interrupt(int irq, void *arg)
 386 {
 387         struct twl4030_bci *bci = arg;
 388         u8 irqs1, irqs2;
 389         int ret;
 390
 391         ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs1,
 392                               TWL4030_INTERRUPTS_BCIISR1A);
 393         if (ret < 0)
 394                 return IRQ_HANDLED;
 395
 396         ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs2,
 397                               TWL4030_INTERRUPTS_BCIISR2A);
 398         if (ret < 0)
 399                 return IRQ_HANDLED;
 400
 401         dev_dbg(bci->dev, "BCI irq %02x %02x\n", irqs2, irqs1);
 402
 403         if (irqs1 & (TWL4030_ICHGLOW | TWL4030_ICHGEOC)) {
 404                 /* charger state change, inform the core */
 405                 power_supply_changed(&bci->ac);
 406                 power_supply_changed(&bci->usb);
 407         }
 408
 409         /* various monitoring events, for now we just log them here */
 410         if (irqs1 & (TWL4030_TBATOR2 | TWL4030_TBATOR1) &&
 411                         __ratelimit(&bci->ratelimit))
 412                 dev_warn(bci->dev, "battery temperature out of range\n");
 413
 414         if (irqs1 & TWL4030_BATSTS && __ratelimit(&bci->ratelimit))
 415                 dev_crit(bci->dev, "battery disconnected\n");
 416
 417         if (irqs2 & TWL4030_VBATOV && __ratelimit(&bci->ratelimit))
 418                 dev_crit(bci->dev, "VBAT overvoltage\n");
 419
 420         if (irqs2 & TWL4030_VBUSOV && __ratelimit(&bci->ratelimit))
 421                 dev_crit(bci->dev, "VBUS overvoltage\n");
 422
 423         if (irqs2 & TWL4030_ACCHGOV && __ratelimit(&bci->ratelimit))
 424                 dev_crit(bci->dev, "Ac charger overvoltage\n");
 425
 426 #if 0
 427         /* ack the interrupts */
 428         twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, irqs1,
 429                          TWL4030_INTERRUPTS_BCIISR1A);
 430         twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, irqs2,
 431                          TWL4030_INTERRUPTS_BCIISR2A);
 432 #endif
 433
 434         return IRQ_HANDLED;
 435 }
 436
 437 static void twl4030_bci_usb_work(struct work_struct *data)
 438 {
 439         struct twl4030_bci *bci = container_of(data, struct twl4030_bci, work);
 440
 441         switch (bci->event) {
 442         case USB_EVENT_VBUS:
 443         case USB_EVENT_CHARGER:
 444                 twl4030_charger_enable_usb(bci, true);
 445                 break;
 446         case USB_EVENT_NONE:
 447                 twl4030_charger_enable_usb(bci, false);
 448                 break;
 449         }
 450 }
 451
 452 static int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val,
 453                                void *priv)
 454 {
 455         struct twl4030_bci *bci = container_of(nb, struct twl4030_bci, otg_nb);
 456
 457         dev_dbg(bci->dev, "OTG notify %lu\n", val);
 458
 459         bci->event = val;
 460         schedule_work(&bci->work);
 461
 462         return NOTIFY_OK;
 463 }
 464
 465 /*
 466  * TI provided formulas:
 467  * CGAIN == 0: ICHG = (BCIICHG * 1.7) / (2^10 - 1) - 0.85
 468  * CGAIN == 1: ICHG = (BCIICHG * 3.4) / (2^10 - 1) - 1.7
 469  * Here we use integer approximation of:
 470  * CGAIN == 0: val * 1.6618 - 0.85
 471  * CGAIN == 1: (val * 1.6618 - 0.85) * 2
 472  */
 473 static int twl4030_charger_get_current(void)
 474 {
 475         int curr;
 476         int ret;
 477         u8 bcictl1;
 478
 479         curr = twl4030bci_read_adc_val(TWL4030_BCIICHG);
 480         if (curr < 0)
 481                 return curr;
 482
 483         ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
 484         if (ret)
 485                 return ret;
 486
 487         ret = (curr * 16618 - 850 * 10000) / 10;
 488         if (bcictl1 & TWL4030_CGAIN)
 489                 ret *= 2;
 490
 491         return ret;
 492 }
 493
 494 static ssize_t twl4030_bci_ac_show_enable(struct device *dev,
 495                                           struct device_attribute *attr,
 496                                           char *buf)
 497 {
 498         u8 boot_bci;
 499         int ret;
 500
 501         ret = twl_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &boot_bci,
 502                               TWL4030_PM_MASTER_BOOT_BCI);
 503         if (ret)
 504                 return ret;
 505
 506         return sprintf(buf, "%d\n", (boot_bci & TWL4030_BCIAUTOAC) ? 1 : 0);
 507 }
 508
 509 static ssize_t twl4030_bci_ac_store_enable(struct device *dev,
 510                                            struct device_attribute *attr,
 511                                            const char *buf, size_t count)
 512 {
 513         struct power_supply *psy = dev_get_drvdata(dev);
 514         struct twl4030_bci *bci = container_of(psy, struct twl4030_bci, ac);
 515         unsigned long enable;
 516         int ret;
 517
 518         ret = strict_strtoul(buf, 10, &enable);
 519         if (ret || enable > 1)
 520                 return -EINVAL;
 521
 522         bci->ac_charge_enable = enable;
 523         twl4030_charger_enable_ac(enable);
 524
 525         return count;
 526 }
 527 static struct device_attribute dev_attr_enable_ac =
 528         __ATTR(enable, S_IRUGO | S_IWUSR, twl4030_bci_ac_show_enable,
 529         twl4030_bci_ac_store_enable);
 530
 531 static ssize_t twl4030_bci_usb_show_enable(struct device *dev,
 532                                            struct device_attribute *attr,
 533                                            char *buf)
 534 {
 535         u8 boot_bci;
 536         int ret;
 537
 538         ret = twl_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &boot_bci,
 539                               TWL4030_PM_MASTER_BOOT_BCI);
 540         if (ret)
 541                 return ret;
 542
 543         return sprintf(buf, "%d\n", (boot_bci & TWL4030_BCIAUTOUSB) ? 1 : 0);
 544 }
 545
 546 static ssize_t twl4030_bci_usb_store_enable(struct device *dev,
 547                                             struct device_attribute *attr,
 548                                             const char *buf, size_t count)
 549 {
 550         struct power_supply *psy = dev_get_drvdata(dev);
 551         struct twl4030_bci *bci = container_of(psy, struct twl4030_bci, usb);
 552         unsigned long enable;
 553         int ret;
 554
 555         ret = strict_strtoul(buf, 10, &enable);
 556         if (ret || enable > 1)
 557                 return -EINVAL;
 558
 559         bci->usb_charge_enable = enable;
 560         twl4030_charger_enable_usb(bci, enable);
 561
 562         return count;
 563 }
 564 static struct device_attribute dev_attr_enable_usb =
 565         __ATTR(enable, S_IRUGO | S_IWUSR, twl4030_bci_usb_show_enable,
 566         twl4030_bci_usb_store_enable);
 567
 568 static ssize_t show_charge_current(struct device *dev,
 569                         struct device_attribute *attr, char *buf)
 570 {
 571         int ret, val;
 572         u8 ctl;
 573
 574         val = twl4030bci_read_adc_val(TWL4030_BCIIREF1);
 575         if (val < 0)
 576                 return val;
 577         ret = twl4030_bci_read(TWL4030_BCICTL1, &ctl);
 578         if (ret < 0)
 579                 return ret;
 580
 581         val &= 0x1ff;
 582         if (ctl & TWL4030_CGAIN)
 583                 val |= 0x200;
 584
 585         return sprintf(buf, "%d\n", val);
 586 }
 587
 588 static ssize_t store_charge_current(struct device *dev,
 589                         struct device_attribute *attr, const char *buf,
 590                         size_t count)
 591 {
 592         struct power_supply *psy = dev_get_drvdata(dev);
 593         struct twl4030_bci *bci = dev_get_drvdata(psy->dev->parent);
 594         unsigned long new_current;
 595         int ret;
 596
 597         ret = strict_strtoul(buf, 10, &new_current);
 598         if (ret)
 599                 return -EINVAL;
 600
 601         ret = set_charge_current(bci, new_current);
 602         if (ret)
 603                 return ret;
 604
 605         if (psy->type == POWER_SUPPLY_TYPE_MAINS)
 606                 bci->ac_current = new_current;
 607         else
 608                 bci->usb_current = new_current;
 609
 610         return count;
 611 }
 612 static DEVICE_ATTR(charge_current, S_IRUGO | S_IWUSR, show_charge_current,
 613         store_charge_current);
 614
 615 static struct attribute *bci_ac_attrs[] = {
 616         &dev_attr_enable_ac.attr,
 617         &dev_attr_charge_current.attr,
 618         NULL,
 619 };
 620
 621 static struct attribute *bci_usb_attrs[] = {
 622         &dev_attr_enable_usb.attr,
 623         &dev_attr_charge_current.attr,
 624         NULL,
 625 };
 626
 627 static const struct attribute_group bci_ac_attr_group = {
 628         .attrs = bci_ac_attrs,
 629 };
 630
 631 static const struct attribute_group bci_usb_attr_group = {
 632         .attrs = bci_usb_attrs,
 633 };
 634
 635 /*
 636  * Returns the main charge FSM state
 637  * Or < 0 on failure.
 638  */
 639 static int twl4030bci_state(struct twl4030_bci *bci)
 640 {
 641         int ret;
 642         u8 state;
 643
 644         ret = twl4030_bci_read(TWL4030_BCIMSTATEC, &state);
 645         if (ret) {
 646                 pr_err("twl4030_bci: error reading BCIMSTATEC\n");
 647                 return ret;
 648         }
 649
 650         dev_dbg(bci->dev, "state: %02x\n", state);
 651
 652         return state;
 653 }
 654
 655 static int twl4030_bci_state_to_status(int state)
 656 {
 657         state &= TWL4030_MSTATEC_MASK;
 658         if (TWL4030_MSTATEC_QUICK1 <= state && state <= TWL4030_MSTATEC_QUICK7)
 659                 return POWER_SUPPLY_STATUS_CHARGING;
 660         else if (TWL4030_MSTATEC_COMPLETE1 <= state &&
 661                                         state <= TWL4030_MSTATEC_COMPLETE4)
 662                 return POWER_SUPPLY_STATUS_FULL;
 663         else
 664                 return POWER_SUPPLY_STATUS_NOT_CHARGING;
 665 }
 666
 667 static int twl4030_bci_get_property(struct power_supply *psy,
 668                                     enum power_supply_property psp,
 669                                     union power_supply_propval *val)
 670 {
 671         struct twl4030_bci *bci = dev_get_drvdata(psy->dev->parent);
 672         int is_charging_any = 0;
 673         int is_charging = 0;
 674         int state;
 675         int ret;
 676
 677         state = twl4030bci_state(bci);
 678         if (state < 0)
 679                 return state;
 680
 681         if (twl4030_bci_state_to_status(state) ==
 682             POWER_SUPPLY_STATUS_CHARGING) {
 683                 is_charging_any =
 684                         state & (TWL4030_MSTATEC_USB | TWL4030_MSTATEC_AC);
 685                 if (psy->type == POWER_SUPPLY_TYPE_USB)
 686                         is_charging = state & TWL4030_MSTATEC_USB;
 687                 else
 688                         is_charging = state & TWL4030_MSTATEC_AC;
 689         }
 690
 691         if (is_charging_any != bci->was_charging_any) {
 692                 led_trigger_event(bci->charging_any_trig,
 693                         is_charging_any ? LED_FULL : LED_OFF);
 694                 bci->was_charging_any = is_charging_any;
 695         }
 696
 697         if (is_charging && psy->type != bci->current_supply) {
 698                 if (psy->type == POWER_SUPPLY_TYPE_USB)
 699                         set_charge_current(bci, bci->usb_current);
 700                 else
 701                         set_charge_current(bci, bci->ac_current);
 702                 bci->current_supply = psy->type;
 703         }
 704
 705         switch (psp) {
 706         case POWER_SUPPLY_PROP_STATUS:
 707                 if (is_charging)
 708                         val->intval = twl4030_bci_state_to_status(state);
 709                 else
 710                         val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
 711                 break;
 712         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 713                 /* charging must be active for meaningful result */
 714                 if (!is_charging)
 715                         return -ENODATA;
 716                 if (psy->type == POWER_SUPPLY_TYPE_USB) {
 717                         ret = twl4030bci_read_adc_val(TWL4030_BCIVBUS);
 718                         if (ret < 0)
 719                                 return ret;
 720                         /* BCIVBUS uses ADCIN8, 7/1023 V/step */
 721                         val->intval = ret * 6843;
 722                 } else {
 723                         ret = twl4030bci_read_adc_val(TWL4030_BCIVAC);
 724                         if (ret < 0)
 725                                 return ret;
 726                         /* BCIVAC uses ADCIN11, 10/1023 V/step */
 727                         val->intval = ret * 9775;
 728                 }
 729                 break;
 730         case POWER_SUPPLY_PROP_CURRENT_NOW:
 731                 if (!is_charging)
 732                         return -ENODATA;
 733                 /* current measurement is shared between AC and USB */
 734                 ret = twl4030_charger_get_current();
 735                 if (ret < 0)
 736                         return ret;
 737                 val->intval = ret;
 738                 break;
 739         case POWER_SUPPLY_PROP_ONLINE:
 740                 val->intval = is_charging &&
 741                         twl4030_bci_state_to_status(state) !=
 742                                 POWER_SUPPLY_STATUS_NOT_CHARGING;
 743                 break;
 744         default:
 745                 return -EINVAL;
 746         }
 747
 748         return 0;
 749 }
 750
 751 static enum power_supply_property twl4030_charger_props[] = {
 752         POWER_SUPPLY_PROP_STATUS,
 753         POWER_SUPPLY_PROP_ONLINE,
 754         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 755         POWER_SUPPLY_PROP_CURRENT_NOW,
 756 };
 757
 758 static int __init twl4030_bci_probe(struct platform_device *pdev)
 759 {
 760         const struct twl4030_bci_platform_data *pdata = pdev->dev.platform_data;
 761         struct twl4030_bci *bci;
 762         int ret;
 763         u32 reg;
 764
 765         if (pdata == NULL) {
 766                 dev_err(&pdev->dev, "No platform data\n");
 767                 return -EINVAL;
 768         }
 769
 770         bci = kzalloc(sizeof(*bci), GFP_KERNEL);
 771         if (bci == NULL)
 772                 return -ENOMEM;
 773
 774         bci->dev = &pdev->dev;
 775         bci->irq_chg = platform_get_irq(pdev, 0);
 776         bci->irq_bci = platform_get_irq(pdev, 1);
 777         bci->ac_current = 860; /* ~1.2A */
 778         bci->usb_current = 360; /* ~600mA */
 779         bci->irq_had_charger = -1;
 780         bci->irq_check_count_time = jiffies;
 781
 782         platform_set_drvdata(pdev, bci);
 783
 784         ratelimit_state_init(&bci->ratelimit, HZ, 2);
 785
 786         led_trigger_register_simple("twl4030_bci-charging",
 787                 &bci->charging_any_trig);
 788
 789         bci->ac.name = "twl4030_ac";
 790         bci->ac.type = POWER_SUPPLY_TYPE_MAINS;
 791         bci->ac.properties = twl4030_charger_props;
 792         bci->ac.num_properties = ARRAY_SIZE(twl4030_charger_props);
 793         bci->ac.get_property = twl4030_bci_get_property;
 794         bci->ac.supplied_to = pdata->supplied_to;
 795         bci->ac.num_supplicants = pdata->num_supplicants;
 796
 797         ret = power_supply_register(&pdev->dev, &bci->ac);
 798         if (ret) {
 799                 dev_err(&pdev->dev, "failed to register ac: %d\n", ret);
 800                 goto fail_register_ac;
 801         }
 802
 803         bci->usb.name = "twl4030_usb";
 804         bci->usb.type = POWER_SUPPLY_TYPE_USB;
 805         bci->usb.properties = twl4030_charger_props;
 806         bci->usb.num_properties = ARRAY_SIZE(twl4030_charger_props);
 807         bci->usb.get_property = twl4030_bci_get_property;
 808         bci->usb.supplied_to = pdata->supplied_to;
 809         bci->usb.num_supplicants = pdata->num_supplicants;
 810
 811         bci->usb_reg = regulator_get(bci->dev, "bci3v1");
 812         if (IS_ERR(bci->usb_reg)) {
 813                 dev_warn(&pdev->dev, "regulator get bci3v1 failed\n");
 814                 bci->usb_reg = NULL;
 815         }
 816
 817         ret = power_supply_register(&pdev->dev, &bci->usb);
 818         if (ret) {
 819                 dev_err(&pdev->dev, "failed to register usb: %d\n", ret);
 820                 goto fail_register_usb;
 821         }
 822
 823         ret = request_threaded_irq(bci->irq_chg, NULL,
 824                         twl4030_charger_interrupt, 0, pdev->name, bci);
 825         if (ret < 0) {
 826                 dev_err(&pdev->dev, "could not request irq %d, status %d\n",
 827                         bci->irq_chg, ret);
 828                 goto fail_chg_irq;
 829         }
 830
 831         ret = request_threaded_irq(bci->irq_bci, NULL,
 832                         twl4030_bci_interrupt, 0, pdev->name, bci);
 833         if (ret < 0) {
 834                 dev_err(&pdev->dev, "could not request irq %d, status %d\n",
 835                         bci->irq_bci, ret);
 836                 goto fail_bci_irq;
 837         }
 838
 839         INIT_WORK(&bci->work, twl4030_bci_usb_work);
 840
 841         bci->transceiver = otg_get_transceiver();
 842         if (bci->transceiver != NULL) {
 843                 bci->otg_nb.notifier_call = twl4030_bci_usb_ncb;
 844                 otg_register_notifier(bci->transceiver, &bci->otg_nb);
 845         }
 846
 847         ret = sysfs_create_group(&bci->ac.dev->kobj, &bci_ac_attr_group);
 848         if (ret) {
 849                 dev_err(&pdev->dev, "failed to create sysfs group: %d\n", ret);
 850                 goto fail_sysfs1;
 851         }
 852
 853         ret = sysfs_create_group(&bci->usb.dev->kobj, &bci_usb_attr_group);
 854         if (ret) {
 855                 dev_err(&pdev->dev, "failed to create sysfs group: %d\n", ret);
 856                 goto fail_sysfs2;
 857         }
 858
 859         /* Enable interrupts now. */
 860         reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_ICHGEOC | TWL4030_TBATOR2 |
 861                 TWL4030_TBATOR1 | TWL4030_BATSTS);
 862         ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
 863                                TWL4030_INTERRUPTS_BCIIMR1A);
 864         if (ret < 0) {
 865                 dev_err(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
 866                 goto fail_unmask_interrupts;
 867         }
 868
 869         reg = ~(u32)(TWL4030_VBATOV | TWL4030_VBUSOV | TWL4030_ACCHGOV);
 870         ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
 871                                TWL4030_INTERRUPTS_BCIIMR2A);
 872         if (ret < 0)
 873                 dev_warn(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
 874
 875         bci->ac_charge_enable = true;
 876         bci->usb_charge_enable = true;
 877         twl4030_charger_enable_ac(true);
 878         twl4030_charger_enable_usb(bci, true);
 879
 880         return 0;
 881
 882 fail_unmask_interrupts:
 883         sysfs_remove_group(&bci->usb.dev->kobj, &bci_usb_attr_group);
 884 fail_sysfs2:
 885         sysfs_remove_group(&bci->ac.dev->kobj, &bci_ac_attr_group);
 886 fail_sysfs1:
 887         if (bci->transceiver != NULL) {
 888                 otg_unregister_notifier(bci->transceiver, &bci->otg_nb);
 889                 otg_put_transceiver(bci->transceiver);
 890         }
 891         free_irq(bci->irq_bci, bci);
 892 fail_bci_irq:
 893         free_irq(bci->irq_chg, bci);
 894 fail_chg_irq:
 895         power_supply_unregister(&bci->usb);
 896 fail_register_usb:
 897         power_supply_unregister(&bci->ac);
 898 fail_register_ac:
 899         led_trigger_unregister_simple(bci->charging_any_trig);
 900         platform_set_drvdata(pdev, NULL);
 901         kfree(bci);
 902
 903         return ret;
 904 }
 905
 906 static int __exit twl4030_bci_remove(struct platform_device *pdev)
 907 {
 908         struct twl4030_bci *bci = platform_get_drvdata(pdev);
 909
 910         sysfs_remove_group(&bci->usb.dev->kobj, &bci_usb_attr_group);
 911         sysfs_remove_group(&bci->ac.dev->kobj, &bci_ac_attr_group);
 912
 913         twl4030_charger_enable_ac(false);
 914         twl4030_charger_enable_usb(bci, false);
 915
 916         /* mask interrupts */
 917         twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
 918                          TWL4030_INTERRUPTS_BCIIMR1A);
 919         twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
 920                          TWL4030_INTERRUPTS_BCIIMR2A);
 921
 922         if (bci->transceiver != NULL) {
 923                 otg_unregister_notifier(bci->transceiver, &bci->otg_nb);
 924                 otg_put_transceiver(bci->transceiver);
 925         }
 926         free_irq(bci->irq_bci, bci);
 927         free_irq(bci->irq_chg, bci);
 928         power_supply_unregister(&bci->usb);
 929         power_supply_unregister(&bci->ac);
 930         led_trigger_unregister_simple(bci->charging_any_trig);
 931         platform_set_drvdata(pdev, NULL);
 932         kfree(bci);
 933
 934         return 0;
 935 }
 936
 937 static struct platform_driver twl4030_bci_driver = {
 938         .driver = {
 939                 .name   = "twl4030_bci",
 940                 .owner  = THIS_MODULE,
 941         },
 942         .remove = __exit_p(twl4030_bci_remove),
 943 };
 944
 945 static int __init twl4030_bci_init(void)
 946 {
 947         return platform_driver_probe(&twl4030_bci_driver, twl4030_bci_probe);
 948 }
 949 module_init(twl4030_bci_init);
 950
 951 static void __exit twl4030_bci_exit(void)
 952 {
 953         platform_driver_unregister(&twl4030_bci_driver);
 954 }
 955 module_exit(twl4030_bci_exit);
 956
 957 MODULE_AUTHOR("Gražvydas Ignotas");
 958 MODULE_DESCRIPTION("TWL4030 Battery Charger Interface driver");
 959 MODULE_LICENSE("GPL");
 960 MODULE_ALIAS("platform:twl4030_bci");