drivers/power/twl4030_charger.c

   1 /*
   2  * TWL4030/TPS65950 BCI (Battery Charger Interface) driver
   3  *
   4  * Copyright (C) 2010 Gražvydas Ignotas <notasas@gmail.com>
   5  *
   6  * based on twl4030_bci_battery.c by TI
   7  * Copyright (C) 2008 Texas Instruments, Inc.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  */
  14
  15 #include <linux/init.h>
  16 #include <linux/module.h>
  17 #include <linux/slab.h>
  18 #include <linux/err.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/i2c/twl.h>
  22 #include <linux/power_supply.h>
  23 #include <linux/notifier.h>
  24 #include <linux/usb/otg.h>
  25
  26 #define TWL4030_BCIMSTATEC      0x02
  27 #define TWL4030_BCIICHG         0x08
  28 #define TWL4030_BCIVAC          0x0a
  29 #define TWL4030_BCIVBUS         0x0c
  30 #define TWL4030_BCIMFSTS3       0x0F
  31 #define TWL4030_BCIMFSTS4       0x10
  32 #define TWL4030_BCICTL1         0x23
  33 #define TWL4030_BB_CFG          0x12
  34 #define TWL4030_BCIIREF1        0x27
  35 #define TWL4030_BCIIREF2        0x28
  36 #define TWL4030_BCIMFKEY        0x11
  37 #define TWL4030_BCIMFTH8        0x1d
  38 #define TWL4030_BCIMFTH9        0x1e
  39
  40 #define TWL4030_BCIMFSTS1       0x01
  41
  42 #define TWL4030_BCIAUTOWEN      BIT(5)
  43 #define TWL4030_CONFIG_DONE     BIT(4)
  44 #define TWL4030_BCIAUTOUSB      BIT(1)
  45 #define TWL4030_BCIAUTOAC       BIT(0)
  46 #define TWL4030_CGAIN           BIT(5)
  47 #define TWL4030_USBFASTMCHG     BIT(2)
  48 #define TWL4030_STS_VBUS        BIT(7)
  49 #define TWL4030_STS_USB_ID      BIT(2)
  50 #define TWL4030_BBCHEN          BIT(4)
  51 #define TWL4030_BBSEL_MASK      0x0c
  52 #define TWL4030_BBSEL_2V5       0x00
  53 #define TWL4030_BBSEL_3V0       0x04
  54 #define TWL4030_BBSEL_3V1       0x08
  55 #define TWL4030_BBSEL_3V2       0x0c
  56 #define TWL4030_BBISEL_MASK     0x03
  57 #define TWL4030_BBISEL_25uA     0x00
  58 #define TWL4030_BBISEL_150uA    0x01
  59 #define TWL4030_BBISEL_500uA    0x02
  60 #define TWL4030_BBISEL_1000uA   0x03
  61
  62 #define TWL4030_BATSTSPCHG      BIT(2)
  63 #define TWL4030_BATSTSMCHG      BIT(6)
  64
  65 /* BCI interrupts */
  66 #define TWL4030_WOVF            BIT(0) /* Watchdog overflow */
  67 #define TWL4030_TMOVF           BIT(1) /* Timer overflow */
  68 #define TWL4030_ICHGHIGH        BIT(2) /* Battery charge current high */
  69 #define TWL4030_ICHGLOW         BIT(3) /* Battery cc. low / FSM state change */
  70 #define TWL4030_ICHGEOC         BIT(4) /* Battery current end-of-charge */
  71 #define TWL4030_TBATOR2         BIT(5) /* Battery temperature out of range 2 */
  72 #define TWL4030_TBATOR1         BIT(6) /* Battery temperature out of range 1 */
  73 #define TWL4030_BATSTS          BIT(7) /* Battery status */
  74
  75 #define TWL4030_VBATLVL         BIT(0) /* VBAT level */
  76 #define TWL4030_VBATOV          BIT(1) /* VBAT overvoltage */
  77 #define TWL4030_VBUSOV          BIT(2) /* VBUS overvoltage */
  78 #define TWL4030_ACCHGOV         BIT(3) /* Ac charger overvoltage */
  79
  80 #define TWL4030_MSTATEC_USB             BIT(4)
  81 #define TWL4030_MSTATEC_AC              BIT(5)
  82 #define TWL4030_MSTATEC_MASK            0x0f
  83 #define TWL4030_MSTATEC_QUICK1          0x02
  84 #define TWL4030_MSTATEC_QUICK7          0x07
  85 #define TWL4030_MSTATEC_COMPLETE1       0x0b
  86 #define TWL4030_MSTATEC_COMPLETE4       0x0e
  87
  88 static bool allow_usb;
  89 module_param(allow_usb, bool, 0644);
  90 MODULE_PARM_DESC(allow_usb, "Allow USB charge drawing default current");
  91
  92 struct twl4030_bci {
  93         struct device           *dev;
  94         struct power_supply     *ac;
  95         struct power_supply     *usb;
  96         struct usb_phy          *transceiver;
  97         struct notifier_block   usb_nb;
  98         struct work_struct      work;
  99         int                     irq_chg;
 100         int                     irq_bci;
 101         int                     usb_enabled;
 102
 103         /*
 104          * ichg values in uA. If any are 'large', we set CGAIN to
 105          * '1' which doubles the range for half the precision.
 106          */
 107         unsigned int            ichg_eoc, ichg_lo, ichg_hi, cur;
 108
 109         unsigned long           event;
 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(TWL_MODULE_MAIN_CHARGE, val, reg);
 133 }
 134
 135 static int twl4030_clear_set_boot_bci(u8 clear, u8 set)
 136 {
 137         return twl4030_clear_set(TWL_MODULE_PM_MASTER, clear,
 138                         TWL4030_CONFIG_DONE | TWL4030_BCIAUTOWEN | set,
 139                         TWL4030_PM_MASTER_BOOT_BCI);
 140 }
 141
 142 static int twl4030bci_read_adc_val(u8 reg)
 143 {
 144         int ret, temp;
 145         u8 val;
 146
 147         /* read MSB */
 148         ret = twl4030_bci_read(reg + 1, &val);
 149         if (ret)
 150                 return ret;
 151
 152         temp = (int)(val & 0x03) << 8;
 153
 154         /* read LSB */
 155         ret = twl4030_bci_read(reg, &val);
 156         if (ret)
 157                 return ret;
 158
 159         return temp | val;
 160 }
 161
 162 /*
 163  * Check if Battery Pack was present
 164  */
 165 static int twl4030_is_battery_present(struct twl4030_bci *bci)
 166 {
 167         int ret;
 168         u8 val = 0;
 169
 170         /* Battery presence in Main charge? */
 171         ret = twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, &val, TWL4030_BCIMFSTS3);
 172         if (ret)
 173                 return ret;
 174         if (val & TWL4030_BATSTSMCHG)
 175                 return 0;
 176
 177         /*
 178          * OK, It could be that bootloader did not enable main charger,
 179          * pre-charge is h/w auto. So, Battery presence in Pre-charge?
 180          */
 181         ret = twl_i2c_read_u8(TWL4030_MODULE_PRECHARGE, &val,
 182                               TWL4030_BCIMFSTS1);
 183         if (ret)
 184                 return ret;
 185         if (val & TWL4030_BATSTSPCHG)
 186                 return 0;
 187
 188         return -ENODEV;
 189 }
 190
 191 /*
 192  * TI provided formulas:
 193  * CGAIN == 0: ICHG = (BCIICHG * 1.7) / (2^10 - 1) - 0.85
 194  * CGAIN == 1: ICHG = (BCIICHG * 3.4) / (2^10 - 1) - 1.7
 195  * Here we use integer approximation of:
 196  * CGAIN == 0: val * 1.6618 - 0.85 * 1000
 197  * CGAIN == 1: (val * 1.6618 - 0.85 * 1000) * 2
 198  */
 199 /*
 200  * convert twl register value for currents into uA
 201  */
 202 static int regval2ua(int regval, bool cgain)
 203 {
 204         if (cgain)
 205                 return (regval * 16618 - 8500 * 1000) / 5;
 206         else
 207                 return (regval * 16618 - 8500 * 1000) / 10;
 208 }
 209
 210 /*
 211  * convert uA currents into twl register value
 212  */
 213 static int ua2regval(int ua, bool cgain)
 214 {
 215         int ret;
 216         if (cgain)
 217                 ua /= 2;
 218         ret = (ua * 10 + 8500 * 1000) / 16618;
 219         /* rounding problems */
 220         if (ret < 512)
 221                 ret = 512;
 222         return ret;
 223 }
 224
 225 static int twl4030_charger_update_current(struct twl4030_bci *bci)
 226 {
 227         int status;
 228         unsigned reg, cur_reg;
 229         u8 bcictl1, oldreg, fullreg;
 230         bool cgain = false;
 231         u8 boot_bci;
 232
 233         /* First, check thresholds and see if cgain is needed */
 234         if (bci->ichg_eoc >= 200000)
 235                 cgain = true;
 236         if (bci->ichg_lo >= 400000)
 237                 cgain = true;
 238         if (bci->ichg_hi >= 820000)
 239                 cgain = true;
 240         if (bci->cur > 852000)
 241                 cgain = true;
 242
 243         status = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
 244         if (status < 0)
 245                 return status;
 246         if (twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &boot_bci,
 247                             TWL4030_PM_MASTER_BOOT_BCI) < 0)
 248                 boot_bci = 0;
 249         boot_bci &= 7;
 250
 251         if ((!!cgain) != !!(bcictl1 & TWL4030_CGAIN))
 252                 /* Need to turn for charging while we change the
 253                  * CGAIN bit.  Leave it off while everything is
 254                  * updated.
 255                  */
 256                 twl4030_clear_set_boot_bci(boot_bci, 0);
 257
 258         /*
 259          * For ichg_eoc, the hardware only supports reg values matching
 260          * 100XXXX000, and requires the XXXX be stored in the high nibble
 261          * of TWL4030_BCIMFTH8.
 262          */
 263         reg = ua2regval(bci->ichg_eoc, cgain);
 264         if (reg > 0x278)
 265                 reg = 0x278;
 266         if (reg < 0x200)
 267                 reg = 0x200;
 268         reg = (reg >> 3) & 0xf;
 269         fullreg = reg << 4;
 270
 271         /*
 272          * For ichg_lo, reg value must match 10XXXX0000.
 273          * XXXX is stored in low nibble of TWL4030_BCIMFTH8.
 274          */
 275         reg = ua2regval(bci->ichg_lo, cgain);
 276         if (reg > 0x2F0)
 277                 reg = 0x2F0;
 278         if (reg < 0x200)
 279                 reg = 0x200;
 280         reg = (reg >> 4) & 0xf;
 281         fullreg |= reg;
 282
 283         /* ichg_eoc and ichg_lo live in same register */
 284         status = twl4030_bci_read(TWL4030_BCIMFTH8, &oldreg);
 285         if (status < 0)
 286                 return status;
 287         if (oldreg != fullreg) {
 288                 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xF4,
 289                                           TWL4030_BCIMFKEY);
 290                 if (status < 0)
 291                         return status;
 292                 twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
 293                                  fullreg, TWL4030_BCIMFTH8);
 294         }
 295
 296         /* ichg_hi threshold must be 1XXXX01100 (I think) */
 297         reg = ua2regval(bci->ichg_hi, cgain);
 298         if (reg > 0x3E0)
 299                 reg = 0x3E0;
 300         if (reg < 0x200)
 301                 reg = 0x200;
 302         fullreg = (reg >> 5) & 0xF;
 303         fullreg <<= 4;
 304         status = twl4030_bci_read(TWL4030_BCIMFTH9, &oldreg);
 305         if (status < 0)
 306                 return status;
 307         if ((oldreg & 0xF0) != fullreg) {
 308                 fullreg |= (oldreg & 0x0F);
 309                 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7,
 310                                           TWL4030_BCIMFKEY);
 311                 if (status < 0)
 312                         return status;
 313                 twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
 314                                  fullreg, TWL4030_BCIMFTH9);
 315         }
 316
 317         /*
 318          * And finally, set the current.  This is stored in
 319          * two registers.
 320          */
 321         reg = ua2regval(bci->cur, cgain);
 322         /* we have only 10 bits */
 323         if (reg > 0x3ff)
 324                 reg = 0x3ff;
 325         status = twl4030_bci_read(TWL4030_BCIIREF1, &oldreg);
 326         if (status < 0)
 327                 return status;
 328         cur_reg = oldreg;
 329         status = twl4030_bci_read(TWL4030_BCIIREF2, &oldreg);
 330         if (status < 0)
 331                 return status;
 332         cur_reg |= oldreg << 8;
 333         if (reg != oldreg) {
 334                 /* disable write protection for one write access for
 335                  * BCIIREF */
 336                 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7,
 337                                           TWL4030_BCIMFKEY);
 338                 if (status < 0)
 339                         return status;
 340                 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
 341                                           (reg & 0x100) ? 3 : 2,
 342                                           TWL4030_BCIIREF2);
 343                 if (status < 0)
 344                         return status;
 345                 /* disable write protection for one write access for
 346                  * BCIIREF */
 347                 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7,
 348                                           TWL4030_BCIMFKEY);
 349                 if (status < 0)
 350                         return status;
 351                 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
 352                                           reg & 0xff,
 353                                           TWL4030_BCIIREF1);
 354         }
 355         if ((!!cgain) != !!(bcictl1 & TWL4030_CGAIN)) {
 356                 /* Flip CGAIN and re-enable charging */
 357                 bcictl1 ^= TWL4030_CGAIN;
 358                 twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
 359                                  bcictl1, TWL4030_BCICTL1);
 360                 twl4030_clear_set_boot_bci(0, boot_bci);
 361         }
 362         return 0;
 363 }
 364
 365 /*
 366  * Enable/Disable USB Charge functionality.
 367  */
 368 static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
 369 {
 370         int ret;
 371
 372         if (enable && !IS_ERR_OR_NULL(bci->transceiver)) {
 373
 374                 /* Need to keep phy powered */
 375                 if (!bci->usb_enabled) {
 376                         pm_runtime_get_sync(bci->transceiver->dev);
 377                         bci->usb_enabled = 1;
 378                 }
 379
 380                 /* forcing the field BCIAUTOUSB (BOOT_BCI[1]) to 1 */
 381                 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOUSB);
 382                 if (ret < 0)
 383                         return ret;
 384
 385                 /* forcing USBFASTMCHG(BCIMFSTS4[2]) to 1 */
 386                 ret = twl4030_clear_set(TWL_MODULE_MAIN_CHARGE, 0,
 387                         TWL4030_USBFASTMCHG, TWL4030_BCIMFSTS4);
 388         } else {
 389                 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOUSB, 0);
 390                 if (bci->usb_enabled) {
 391                         pm_runtime_mark_last_busy(bci->transceiver->dev);
 392                         pm_runtime_put_autosuspend(bci->transceiver->dev);
 393                         bci->usb_enabled = 0;
 394                 }
 395         }
 396
 397         return ret;
 398 }
 399
 400 /*
 401  * Enable/Disable AC Charge funtionality.
 402  */
 403 static int twl4030_charger_enable_ac(bool enable)
 404 {
 405         int ret;
 406
 407         if (enable)
 408                 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOAC);
 409         else
 410                 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC, 0);
 411
 412         return ret;
 413 }
 414
 415 /*
 416  * Enable/Disable charging of Backup Battery.
 417  */
 418 static int twl4030_charger_enable_backup(int uvolt, int uamp)
 419 {
 420         int ret;
 421         u8 flags;
 422
 423         if (uvolt < 2500000 ||
 424             uamp < 25) {
 425                 /* disable charging of backup battery */
 426                 ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER,
 427                                         TWL4030_BBCHEN, 0, TWL4030_BB_CFG);
 428                 return ret;
 429         }
 430
 431         flags = TWL4030_BBCHEN;
 432         if (uvolt >= 3200000)
 433                 flags |= TWL4030_BBSEL_3V2;
 434         else if (uvolt >= 3100000)
 435                 flags |= TWL4030_BBSEL_3V1;
 436         else if (uvolt >= 3000000)
 437                 flags |= TWL4030_BBSEL_3V0;
 438         else
 439                 flags |= TWL4030_BBSEL_2V5;
 440
 441         if (uamp >= 1000)
 442                 flags |= TWL4030_BBISEL_1000uA;
 443         else if (uamp >= 500)
 444                 flags |= TWL4030_BBISEL_500uA;
 445         else if (uamp >= 150)
 446                 flags |= TWL4030_BBISEL_150uA;
 447         else
 448                 flags |= TWL4030_BBISEL_25uA;
 449
 450         ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER,
 451                                 TWL4030_BBSEL_MASK | TWL4030_BBISEL_MASK,
 452                                 flags,
 453                                 TWL4030_BB_CFG);
 454
 455         return ret;
 456 }
 457
 458 /*
 459  * TWL4030 CHG_PRES (AC charger presence) events
 460  */
 461 static irqreturn_t twl4030_charger_interrupt(int irq, void *arg)
 462 {
 463         struct twl4030_bci *bci = arg;
 464
 465         dev_dbg(bci->dev, "CHG_PRES irq\n");
 466         power_supply_changed(bci->ac);
 467         power_supply_changed(bci->usb);
 468
 469         return IRQ_HANDLED;
 470 }
 471
 472 /*
 473  * TWL4030 BCI monitoring events
 474  */
 475 static irqreturn_t twl4030_bci_interrupt(int irq, void *arg)
 476 {
 477         struct twl4030_bci *bci = arg;
 478         u8 irqs1, irqs2;
 479         int ret;
 480
 481         ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs1,
 482                               TWL4030_INTERRUPTS_BCIISR1A);
 483         if (ret < 0)
 484                 return IRQ_HANDLED;
 485
 486         ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs2,
 487                               TWL4030_INTERRUPTS_BCIISR2A);
 488         if (ret < 0)
 489                 return IRQ_HANDLED;
 490
 491         dev_dbg(bci->dev, "BCI irq %02x %02x\n", irqs2, irqs1);
 492
 493         if (irqs1 & (TWL4030_ICHGLOW | TWL4030_ICHGEOC)) {
 494                 /* charger state change, inform the core */
 495                 power_supply_changed(bci->ac);
 496                 power_supply_changed(bci->usb);
 497         }
 498
 499         /* various monitoring events, for now we just log them here */
 500         if (irqs1 & (TWL4030_TBATOR2 | TWL4030_TBATOR1))
 501                 dev_warn(bci->dev, "battery temperature out of range\n");
 502
 503         if (irqs1 & TWL4030_BATSTS)
 504                 dev_crit(bci->dev, "battery disconnected\n");
 505
 506         if (irqs2 & TWL4030_VBATOV)
 507                 dev_crit(bci->dev, "VBAT overvoltage\n");
 508
 509         if (irqs2 & TWL4030_VBUSOV)
 510                 dev_crit(bci->dev, "VBUS overvoltage\n");
 511
 512         if (irqs2 & TWL4030_ACCHGOV)
 513                 dev_crit(bci->dev, "Ac charger overvoltage\n");
 514
 515         return IRQ_HANDLED;
 516 }
 517
 518 static void twl4030_bci_usb_work(struct work_struct *data)
 519 {
 520         struct twl4030_bci *bci = container_of(data, struct twl4030_bci, work);
 521
 522         switch (bci->event) {
 523         case USB_EVENT_VBUS:
 524         case USB_EVENT_CHARGER:
 525                 twl4030_charger_enable_usb(bci, true);
 526                 break;
 527         case USB_EVENT_NONE:
 528                 twl4030_charger_enable_usb(bci, false);
 529                 break;
 530         }
 531 }
 532
 533 static int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val,
 534                                void *priv)
 535 {
 536         struct twl4030_bci *bci = container_of(nb, struct twl4030_bci, usb_nb);
 537
 538         dev_dbg(bci->dev, "OTG notify %lu\n", val);
 539
 540         bci->event = val;
 541         schedule_work(&bci->work);
 542
 543         return NOTIFY_OK;
 544 }
 545
 546 static int twl4030_charger_get_current(void)
 547 {
 548         int curr;
 549         int ret;
 550         u8 bcictl1;
 551
 552         curr = twl4030bci_read_adc_val(TWL4030_BCIICHG);
 553         if (curr < 0)
 554                 return curr;
 555
 556         ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
 557         if (ret)
 558                 return ret;
 559
 560         return regval2ua(curr, bcictl1 & TWL4030_CGAIN);
 561 }
 562
 563 /*
 564  * Returns the main charge FSM state
 565  * Or < 0 on failure.
 566  */
 567 static int twl4030bci_state(struct twl4030_bci *bci)
 568 {
 569         int ret;
 570         u8 state;
 571
 572         ret = twl4030_bci_read(TWL4030_BCIMSTATEC, &state);
 573         if (ret) {
 574                 pr_err("twl4030_bci: error reading BCIMSTATEC\n");
 575                 return ret;
 576         }
 577
 578         dev_dbg(bci->dev, "state: %02x\n", state);
 579
 580         return state;
 581 }
 582
 583 static int twl4030_bci_state_to_status(int state)
 584 {
 585         state &= TWL4030_MSTATEC_MASK;
 586         if (TWL4030_MSTATEC_QUICK1 <= state && state <= TWL4030_MSTATEC_QUICK7)
 587                 return POWER_SUPPLY_STATUS_CHARGING;
 588         else if (TWL4030_MSTATEC_COMPLETE1 <= state &&
 589                                         state <= TWL4030_MSTATEC_COMPLETE4)
 590                 return POWER_SUPPLY_STATUS_FULL;
 591         else
 592                 return POWER_SUPPLY_STATUS_NOT_CHARGING;
 593 }
 594
 595 static int twl4030_bci_get_property(struct power_supply *psy,
 596                                     enum power_supply_property psp,
 597                                     union power_supply_propval *val)
 598 {
 599         struct twl4030_bci *bci = dev_get_drvdata(psy->dev.parent);
 600         int is_charging;
 601         int state;
 602         int ret;
 603
 604         state = twl4030bci_state(bci);
 605         if (state < 0)
 606                 return state;
 607
 608         if (psy->desc->type == POWER_SUPPLY_TYPE_USB)
 609                 is_charging = state & TWL4030_MSTATEC_USB;
 610         else
 611                 is_charging = state & TWL4030_MSTATEC_AC;
 612
 613         switch (psp) {
 614         case POWER_SUPPLY_PROP_STATUS:
 615                 if (is_charging)
 616                         val->intval = twl4030_bci_state_to_status(state);
 617                 else
 618                         val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
 619                 break;
 620         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 621                 /* charging must be active for meaningful result */
 622                 if (!is_charging)
 623                         return -ENODATA;
 624                 if (psy->desc->type == POWER_SUPPLY_TYPE_USB) {
 625                         ret = twl4030bci_read_adc_val(TWL4030_BCIVBUS);
 626                         if (ret < 0)
 627                                 return ret;
 628                         /* BCIVBUS uses ADCIN8, 7/1023 V/step */
 629                         val->intval = ret * 6843;
 630                 } else {
 631                         ret = twl4030bci_read_adc_val(TWL4030_BCIVAC);
 632                         if (ret < 0)
 633                                 return ret;
 634                         /* BCIVAC uses ADCIN11, 10/1023 V/step */
 635                         val->intval = ret * 9775;
 636                 }
 637                 break;
 638         case POWER_SUPPLY_PROP_CURRENT_NOW:
 639                 if (!is_charging)
 640                         return -ENODATA;
 641                 /* current measurement is shared between AC and USB */
 642                 ret = twl4030_charger_get_current();
 643                 if (ret < 0)
 644                         return ret;
 645                 val->intval = ret;
 646                 break;
 647         case POWER_SUPPLY_PROP_ONLINE:
 648                 val->intval = is_charging &&
 649                         twl4030_bci_state_to_status(state) !=
 650                                 POWER_SUPPLY_STATUS_NOT_CHARGING;
 651                 break;
 652         default:
 653                 return -EINVAL;
 654         }
 655
 656         return 0;
 657 }
 658
 659 static enum power_supply_property twl4030_charger_props[] = {
 660         POWER_SUPPLY_PROP_STATUS,
 661         POWER_SUPPLY_PROP_ONLINE,
 662         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 663         POWER_SUPPLY_PROP_CURRENT_NOW,
 664 };
 665
 666 #ifdef CONFIG_OF
 667 static const struct twl4030_bci_platform_data *
 668 twl4030_bci_parse_dt(struct device *dev)
 669 {
 670         struct device_node *np = dev->of_node;
 671         struct twl4030_bci_platform_data *pdata;
 672         u32 num;
 673
 674         if (!np)
 675                 return NULL;
 676         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 677         if (!pdata)
 678                 return pdata;
 679
 680         if (of_property_read_u32(np, "ti,bb-uvolt", &num) == 0)
 681                 pdata->bb_uvolt = num;
 682         if (of_property_read_u32(np, "ti,bb-uamp", &num) == 0)
 683                 pdata->bb_uamp = num;
 684         return pdata;
 685 }
 686 #else
 687 static inline const struct twl4030_bci_platform_data *
 688 twl4030_bci_parse_dt(struct device *dev)
 689 {
 690         return NULL;
 691 }
 692 #endif
 693
 694 static const struct power_supply_desc twl4030_bci_ac_desc = {
 695         .name           = "twl4030_ac",
 696         .type           = POWER_SUPPLY_TYPE_MAINS,
 697         .properties     = twl4030_charger_props,
 698         .num_properties = ARRAY_SIZE(twl4030_charger_props),
 699         .get_property   = twl4030_bci_get_property,
 700 };
 701
 702 static const struct power_supply_desc twl4030_bci_usb_desc = {
 703         .name           = "twl4030_usb",
 704         .type           = POWER_SUPPLY_TYPE_USB,
 705         .properties     = twl4030_charger_props,
 706         .num_properties = ARRAY_SIZE(twl4030_charger_props),
 707         .get_property   = twl4030_bci_get_property,
 708 };
 709
 710 static int twl4030_bci_probe(struct platform_device *pdev)
 711 {
 712         struct twl4030_bci *bci;
 713         const struct twl4030_bci_platform_data *pdata = pdev->dev.platform_data;
 714         int ret;
 715         u32 reg;
 716
 717         bci = devm_kzalloc(&pdev->dev, sizeof(*bci), GFP_KERNEL);
 718         if (bci == NULL)
 719                 return -ENOMEM;
 720
 721         if (!pdata)
 722                 pdata = twl4030_bci_parse_dt(&pdev->dev);
 723
 724         bci->ichg_eoc = 80100; /* Stop charging when current drops to here */
 725         bci->ichg_lo = 241000; /* Low threshold */
 726         bci->ichg_hi = 500000; /* High threshold */
 727         if (allow_usb)
 728                 bci->cur = 500000;  /* 500mA */
 729         else
 730                 bci->cur = 100000;  /* 100mA */
 731
 732         bci->dev = &pdev->dev;
 733         bci->irq_chg = platform_get_irq(pdev, 0);
 734         bci->irq_bci = platform_get_irq(pdev, 1);
 735
 736         /* Only proceed further *IF* battery is physically present */
 737         ret = twl4030_is_battery_present(bci);
 738         if  (ret) {
 739                 dev_crit(&pdev->dev, "Battery was not detected:%d\n", ret);
 740                 return ret;
 741         }
 742
 743         platform_set_drvdata(pdev, bci);
 744
 745         bci->ac = devm_power_supply_register(&pdev->dev, &twl4030_bci_ac_desc,
 746                                              NULL);
 747         if (IS_ERR(bci->ac)) {
 748                 ret = PTR_ERR(bci->ac);
 749                 dev_err(&pdev->dev, "failed to register ac: %d\n", ret);
 750                 return ret;
 751         }
 752
 753         bci->usb = devm_power_supply_register(&pdev->dev, &twl4030_bci_usb_desc,
 754                                               NULL);
 755         if (IS_ERR(bci->usb)) {
 756                 ret = PTR_ERR(bci->usb);
 757                 dev_err(&pdev->dev, "failed to register usb: %d\n", ret);
 758                 return ret;
 759         }
 760
 761         ret = devm_request_threaded_irq(&pdev->dev, bci->irq_chg, NULL,
 762                         twl4030_charger_interrupt, IRQF_ONESHOT, pdev->name,
 763                         bci);
 764         if (ret < 0) {
 765                 dev_err(&pdev->dev, "could not request irq %d, status %d\n",
 766                         bci->irq_chg, ret);
 767                 return ret;
 768         }
 769
 770         ret = devm_request_threaded_irq(&pdev->dev, bci->irq_bci, NULL,
 771                         twl4030_bci_interrupt, IRQF_ONESHOT, pdev->name, bci);
 772         if (ret < 0) {
 773                 dev_err(&pdev->dev, "could not request irq %d, status %d\n",
 774                         bci->irq_bci, ret);
 775                 return ret;
 776         }
 777
 778         INIT_WORK(&bci->work, twl4030_bci_usb_work);
 779
 780         bci->usb_nb.notifier_call = twl4030_bci_usb_ncb;
 781         if (bci->dev->of_node) {
 782                 struct device_node *phynode;
 783
 784                 phynode = of_find_compatible_node(bci->dev->of_node->parent,
 785                                                   NULL, "ti,twl4030-usb");
 786                 if (phynode) {
 787                         bci->transceiver = devm_usb_get_phy_by_node(
 788                                 bci->dev, phynode, &bci->usb_nb);
 789                         if (IS_ERR(bci->transceiver) &&
 790                             PTR_ERR(bci->transceiver) == -EPROBE_DEFER)
 791                                 return -EPROBE_DEFER;
 792                 }
 793         }
 794
 795         /* Enable interrupts now. */
 796         reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_ICHGEOC | TWL4030_TBATOR2 |
 797                 TWL4030_TBATOR1 | TWL4030_BATSTS);
 798         ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
 799                                TWL4030_INTERRUPTS_BCIIMR1A);
 800         if (ret < 0) {
 801                 dev_err(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
 802                 return ret;
 803         }
 804
 805         reg = ~(u32)(TWL4030_VBATOV | TWL4030_VBUSOV | TWL4030_ACCHGOV);
 806         ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
 807                                TWL4030_INTERRUPTS_BCIIMR2A);
 808         if (ret < 0)
 809                 dev_warn(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
 810
 811         twl4030_charger_update_current(bci);
 812         twl4030_charger_enable_ac(true);
 813         if (!IS_ERR_OR_NULL(bci->transceiver))
 814                 twl4030_bci_usb_ncb(&bci->usb_nb,
 815                                     bci->transceiver->last_event,
 816                                     NULL);
 817         else
 818                 twl4030_charger_enable_usb(bci, false);
 819         if (pdata)
 820                 twl4030_charger_enable_backup(pdata->bb_uvolt,
 821                                               pdata->bb_uamp);
 822         else
 823                 twl4030_charger_enable_backup(0, 0);
 824
 825         return 0;
 826 }
 827
 828 static int __exit twl4030_bci_remove(struct platform_device *pdev)
 829 {
 830         struct twl4030_bci *bci = platform_get_drvdata(pdev);
 831
 832         twl4030_charger_enable_ac(false);
 833         twl4030_charger_enable_usb(bci, false);
 834         twl4030_charger_enable_backup(0, 0);
 835
 836         /* mask interrupts */
 837         twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
 838                          TWL4030_INTERRUPTS_BCIIMR1A);
 839         twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
 840                          TWL4030_INTERRUPTS_BCIIMR2A);
 841
 842         return 0;
 843 }
 844
 845 static const struct of_device_id twl_bci_of_match[] = {
 846         {.compatible = "ti,twl4030-bci", },
 847         { }
 848 };
 849 MODULE_DEVICE_TABLE(of, twl_bci_of_match);
 850
 851 static struct platform_driver twl4030_bci_driver = {
 852         .probe = twl4030_bci_probe,
 853         .driver = {
 854                 .name   = "twl4030_bci",
 855                 .of_match_table = of_match_ptr(twl_bci_of_match),
 856         },
 857         .remove = __exit_p(twl4030_bci_remove),
 858 };
 859 module_platform_driver(twl4030_bci_driver);
 860
 861 MODULE_AUTHOR("Gražvydas Ignotas");
 862 MODULE_DESCRIPTION("TWL4030 Battery Charger Interface driver");
 863 MODULE_LICENSE("GPL");
 864 MODULE_ALIAS("platform:twl4030_bci");