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 #include <linux/i2c/twl4030-madc.h>
  26
  27 #define TWL4030_BCIMDEN         0x00
  28 #define TWL4030_BCIMDKEY        0x01
  29 #define TWL4030_BCIMSTATEC      0x02
  30 #define TWL4030_BCIICHG         0x08
  31 #define TWL4030_BCIVAC          0x0a
  32 #define TWL4030_BCIVBUS         0x0c
  33 #define TWL4030_BCIMFSTS3       0x0F
  34 #define TWL4030_BCIMFSTS4       0x10
  35 #define TWL4030_BCICTL1         0x23
  36 #define TWL4030_BB_CFG          0x12
  37 #define TWL4030_BCIIREF1        0x27
  38 #define TWL4030_BCIIREF2        0x28
  39 #define TWL4030_BCIMFKEY        0x11
  40 #define TWL4030_BCIMFEN3        0x14
  41 #define TWL4030_BCIMFTH8        0x1d
  42 #define TWL4030_BCIMFTH9        0x1e
  43 #define TWL4030_BCIWDKEY        0x21
  44
  45 #define TWL4030_BCIMFSTS1       0x01
  46
  47 #define TWL4030_BCIAUTOWEN      BIT(5)
  48 #define TWL4030_CONFIG_DONE     BIT(4)
  49 #define TWL4030_CVENAC          BIT(2)
  50 #define TWL4030_BCIAUTOUSB      BIT(1)
  51 #define TWL4030_BCIAUTOAC       BIT(0)
  52 #define TWL4030_CGAIN           BIT(5)
  53 #define TWL4030_USBFASTMCHG     BIT(2)
  54 #define TWL4030_STS_VBUS        BIT(7)
  55 #define TWL4030_STS_USB_ID      BIT(2)
  56 #define TWL4030_BBCHEN          BIT(4)
  57 #define TWL4030_BBSEL_MASK      0x0c
  58 #define TWL4030_BBSEL_2V5       0x00
  59 #define TWL4030_BBSEL_3V0       0x04
  60 #define TWL4030_BBSEL_3V1       0x08
  61 #define TWL4030_BBSEL_3V2       0x0c
  62 #define TWL4030_BBISEL_MASK     0x03
  63 #define TWL4030_BBISEL_25uA     0x00
  64 #define TWL4030_BBISEL_150uA    0x01
  65 #define TWL4030_BBISEL_500uA    0x02
  66 #define TWL4030_BBISEL_1000uA   0x03
  67
  68 #define TWL4030_BATSTSPCHG      BIT(2)
  69 #define TWL4030_BATSTSMCHG      BIT(6)
  70
  71 /* BCI interrupts */
  72 #define TWL4030_WOVF            BIT(0) /* Watchdog overflow */
  73 #define TWL4030_TMOVF           BIT(1) /* Timer overflow */
  74 #define TWL4030_ICHGHIGH        BIT(2) /* Battery charge current high */
  75 #define TWL4030_ICHGLOW         BIT(3) /* Battery cc. low / FSM state change */
  76 #define TWL4030_ICHGEOC         BIT(4) /* Battery current end-of-charge */
  77 #define TWL4030_TBATOR2         BIT(5) /* Battery temperature out of range 2 */
  78 #define TWL4030_TBATOR1         BIT(6) /* Battery temperature out of range 1 */
  79 #define TWL4030_BATSTS          BIT(7) /* Battery status */
  80
  81 #define TWL4030_VBATLVL         BIT(0) /* VBAT level */
  82 #define TWL4030_VBATOV          BIT(1) /* VBAT overvoltage */
  83 #define TWL4030_VBUSOV          BIT(2) /* VBUS overvoltage */
  84 #define TWL4030_ACCHGOV         BIT(3) /* Ac charger overvoltage */
  85
  86 #define TWL4030_MSTATEC_USB             BIT(4)
  87 #define TWL4030_MSTATEC_AC              BIT(5)
  88 #define TWL4030_MSTATEC_MASK            0x0f
  89 #define TWL4030_MSTATEC_QUICK1          0x02
  90 #define TWL4030_MSTATEC_QUICK7          0x07
  91 #define TWL4030_MSTATEC_COMPLETE1       0x0b
  92 #define TWL4030_MSTATEC_COMPLETE4       0x0e
  93
  94 static bool allow_usb;
  95 module_param(allow_usb, bool, 0644);
  96 MODULE_PARM_DESC(allow_usb, "Allow USB charge drawing default current");
  97
  98 struct twl4030_bci {
  99         struct device           *dev;
 100         struct power_supply     *ac;
 101         struct power_supply     *usb;
 102         struct usb_phy          *transceiver;
 103         struct notifier_block   usb_nb;
 104         struct work_struct      work;
 105         int                     irq_chg;
 106         int                     irq_bci;
 107         int                     usb_enabled;
 108
 109         /*
 110          * ichg_* and *_cur values in uA. If any are 'large', we set
 111          * CGAIN to '1' which doubles the range for half the
 112          * precision.
 113          */
 114         unsigned int            ichg_eoc, ichg_lo, ichg_hi;
 115         unsigned int            usb_cur, ac_cur;
 116         bool                    ac_is_active;
 117         int                     usb_mode; /* charging mode requested */
 118 #define CHARGE_OFF      0
 119 #define CHARGE_AUTO     1
 120 #define CHARGE_LINEAR   2
 121
 122         unsigned long           event;
 123 };
 124
 125 /* strings for 'usb_mode' values */
 126 static char *modes[] = { "off", "auto", "continuous" };
 127
 128 /*
 129  * clear and set bits on an given register on a given module
 130  */
 131 static int twl4030_clear_set(u8 mod_no, u8 clear, u8 set, u8 reg)
 132 {
 133         u8 val = 0;
 134         int ret;
 135
 136         ret = twl_i2c_read_u8(mod_no, &val, reg);
 137         if (ret)
 138                 return ret;
 139
 140         val &= ~clear;
 141         val |= set;
 142
 143         return twl_i2c_write_u8(mod_no, val, reg);
 144 }
 145
 146 static int twl4030_bci_read(u8 reg, u8 *val)
 147 {
 148         return twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, val, reg);
 149 }
 150
 151 static int twl4030_clear_set_boot_bci(u8 clear, u8 set)
 152 {
 153         return twl4030_clear_set(TWL_MODULE_PM_MASTER, clear,
 154                         TWL4030_CONFIG_DONE | TWL4030_BCIAUTOWEN | set,
 155                         TWL4030_PM_MASTER_BOOT_BCI);
 156 }
 157
 158 static int twl4030bci_read_adc_val(u8 reg)
 159 {
 160         int ret, temp;
 161         u8 val;
 162
 163         /* read MSB */
 164         ret = twl4030_bci_read(reg + 1, &val);
 165         if (ret)
 166                 return ret;
 167
 168         temp = (int)(val & 0x03) << 8;
 169
 170         /* read LSB */
 171         ret = twl4030_bci_read(reg, &val);
 172         if (ret)
 173                 return ret;
 174
 175         return temp | val;
 176 }
 177
 178 /*
 179  * Check if Battery Pack was present
 180  */
 181 static int twl4030_is_battery_present(struct twl4030_bci *bci)
 182 {
 183         int ret;
 184         u8 val = 0;
 185
 186         /* Battery presence in Main charge? */
 187         ret = twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, &val, TWL4030_BCIMFSTS3);
 188         if (ret)
 189                 return ret;
 190         if (val & TWL4030_BATSTSMCHG)
 191                 return 0;
 192
 193         /*
 194          * OK, It could be that bootloader did not enable main charger,
 195          * pre-charge is h/w auto. So, Battery presence in Pre-charge?
 196          */
 197         ret = twl_i2c_read_u8(TWL4030_MODULE_PRECHARGE, &val,
 198                               TWL4030_BCIMFSTS1);
 199         if (ret)
 200                 return ret;
 201         if (val & TWL4030_BATSTSPCHG)
 202                 return 0;
 203
 204         return -ENODEV;
 205 }
 206
 207 /*
 208  * TI provided formulas:
 209  * CGAIN == 0: ICHG = (BCIICHG * 1.7) / (2^10 - 1) - 0.85
 210  * CGAIN == 1: ICHG = (BCIICHG * 3.4) / (2^10 - 1) - 1.7
 211  * Here we use integer approximation of:
 212  * CGAIN == 0: val * 1.6618 - 0.85 * 1000
 213  * CGAIN == 1: (val * 1.6618 - 0.85 * 1000) * 2
 214  */
 215 /*
 216  * convert twl register value for currents into uA
 217  */
 218 static int regval2ua(int regval, bool cgain)
 219 {
 220         if (cgain)
 221                 return (regval * 16618 - 8500 * 1000) / 5;
 222         else
 223                 return (regval * 16618 - 8500 * 1000) / 10;
 224 }
 225
 226 /*
 227  * convert uA currents into twl register value
 228  */
 229 static int ua2regval(int ua, bool cgain)
 230 {
 231         int ret;
 232         if (cgain)
 233                 ua /= 2;
 234         ret = (ua * 10 + 8500 * 1000) / 16618;
 235         /* rounding problems */
 236         if (ret < 512)
 237                 ret = 512;
 238         return ret;
 239 }
 240
 241 static int twl4030_charger_update_current(struct twl4030_bci *bci)
 242 {
 243         int status;
 244         int cur;
 245         unsigned reg, cur_reg;
 246         u8 bcictl1, oldreg, fullreg;
 247         bool cgain = false;
 248         u8 boot_bci;
 249
 250         /*
 251          * If AC (Accessory Charger) voltage exceeds 4.5V (MADC 11)
 252          * and AC is enabled, set current for 'ac'
 253          */
 254         if (twl4030_get_madc_conversion(11) > 4500) {
 255                 cur = bci->ac_cur;
 256                 bci->ac_is_active = true;
 257         } else {
 258                 cur = bci->usb_cur;
 259                 bci->ac_is_active = false;
 260         }
 261
 262         /* First, check thresholds and see if cgain is needed */
 263         if (bci->ichg_eoc >= 200000)
 264                 cgain = true;
 265         if (bci->ichg_lo >= 400000)
 266                 cgain = true;
 267         if (bci->ichg_hi >= 820000)
 268                 cgain = true;
 269         if (cur > 852000)
 270                 cgain = true;
 271
 272         status = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
 273         if (status < 0)
 274                 return status;
 275         if (twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &boot_bci,
 276                             TWL4030_PM_MASTER_BOOT_BCI) < 0)
 277                 boot_bci = 0;
 278         boot_bci &= 7;
 279
 280         if ((!!cgain) != !!(bcictl1 & TWL4030_CGAIN))
 281                 /* Need to turn for charging while we change the
 282                  * CGAIN bit.  Leave it off while everything is
 283                  * updated.
 284                  */
 285                 twl4030_clear_set_boot_bci(boot_bci, 0);
 286
 287         /*
 288          * For ichg_eoc, the hardware only supports reg values matching
 289          * 100XXXX000, and requires the XXXX be stored in the high nibble
 290          * of TWL4030_BCIMFTH8.
 291          */
 292         reg = ua2regval(bci->ichg_eoc, cgain);
 293         if (reg > 0x278)
 294                 reg = 0x278;
 295         if (reg < 0x200)
 296                 reg = 0x200;
 297         reg = (reg >> 3) & 0xf;
 298         fullreg = reg << 4;
 299
 300         /*
 301          * For ichg_lo, reg value must match 10XXXX0000.
 302          * XXXX is stored in low nibble of TWL4030_BCIMFTH8.
 303          */
 304         reg = ua2regval(bci->ichg_lo, cgain);
 305         if (reg > 0x2F0)
 306                 reg = 0x2F0;
 307         if (reg < 0x200)
 308                 reg = 0x200;
 309         reg = (reg >> 4) & 0xf;
 310         fullreg |= reg;
 311
 312         /* ichg_eoc and ichg_lo live in same register */
 313         status = twl4030_bci_read(TWL4030_BCIMFTH8, &oldreg);
 314         if (status < 0)
 315                 return status;
 316         if (oldreg != fullreg) {
 317                 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xF4,
 318                                           TWL4030_BCIMFKEY);
 319                 if (status < 0)
 320                         return status;
 321                 twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
 322                                  fullreg, TWL4030_BCIMFTH8);
 323         }
 324
 325         /* ichg_hi threshold must be 1XXXX01100 (I think) */
 326         reg = ua2regval(bci->ichg_hi, cgain);
 327         if (reg > 0x3E0)
 328                 reg = 0x3E0;
 329         if (reg < 0x200)
 330                 reg = 0x200;
 331         fullreg = (reg >> 5) & 0xF;
 332         fullreg <<= 4;
 333         status = twl4030_bci_read(TWL4030_BCIMFTH9, &oldreg);
 334         if (status < 0)
 335                 return status;
 336         if ((oldreg & 0xF0) != fullreg) {
 337                 fullreg |= (oldreg & 0x0F);
 338                 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7,
 339                                           TWL4030_BCIMFKEY);
 340                 if (status < 0)
 341                         return status;
 342                 twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
 343                                  fullreg, TWL4030_BCIMFTH9);
 344         }
 345
 346         /*
 347          * And finally, set the current.  This is stored in
 348          * two registers.
 349          */
 350         reg = ua2regval(cur, cgain);
 351         /* we have only 10 bits */
 352         if (reg > 0x3ff)
 353                 reg = 0x3ff;
 354         status = twl4030_bci_read(TWL4030_BCIIREF1, &oldreg);
 355         if (status < 0)
 356                 return status;
 357         cur_reg = oldreg;
 358         status = twl4030_bci_read(TWL4030_BCIIREF2, &oldreg);
 359         if (status < 0)
 360                 return status;
 361         cur_reg |= oldreg << 8;
 362         if (reg != oldreg) {
 363                 /* disable write protection for one write access for
 364                  * BCIIREF */
 365                 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7,
 366                                           TWL4030_BCIMFKEY);
 367                 if (status < 0)
 368                         return status;
 369                 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
 370                                           (reg & 0x100) ? 3 : 2,
 371                                           TWL4030_BCIIREF2);
 372                 if (status < 0)
 373                         return status;
 374                 /* disable write protection for one write access for
 375                  * BCIIREF */
 376                 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7,
 377                                           TWL4030_BCIMFKEY);
 378                 if (status < 0)
 379                         return status;
 380                 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
 381                                           reg & 0xff,
 382                                           TWL4030_BCIIREF1);
 383         }
 384         if ((!!cgain) != !!(bcictl1 & TWL4030_CGAIN)) {
 385                 /* Flip CGAIN and re-enable charging */
 386                 bcictl1 ^= TWL4030_CGAIN;
 387                 twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
 388                                  bcictl1, TWL4030_BCICTL1);
 389                 twl4030_clear_set_boot_bci(0, boot_bci);
 390         }
 391         return 0;
 392 }
 393
 394 /*
 395  * Enable/Disable USB Charge functionality.
 396  */
 397 static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
 398 {
 399         int ret;
 400
 401         if (bci->usb_mode == CHARGE_OFF)
 402                 enable = false;
 403         if (enable && !IS_ERR_OR_NULL(bci->transceiver)) {
 404
 405                 twl4030_charger_update_current(bci);
 406
 407                 /* Need to keep phy powered */
 408                 if (!bci->usb_enabled) {
 409                         pm_runtime_get_sync(bci->transceiver->dev);
 410                         bci->usb_enabled = 1;
 411                 }
 412
 413                 if (bci->usb_mode == CHARGE_AUTO)
 414                         /* forcing the field BCIAUTOUSB (BOOT_BCI[1]) to 1 */
 415                         ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOUSB);
 416
 417                 /* forcing USBFASTMCHG(BCIMFSTS4[2]) to 1 */
 418                 ret = twl4030_clear_set(TWL_MODULE_MAIN_CHARGE, 0,
 419                         TWL4030_USBFASTMCHG, TWL4030_BCIMFSTS4);
 420                 if (bci->usb_mode == CHARGE_LINEAR) {
 421                         twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC|TWL4030_CVENAC, 0);
 422                         /* Watch dog key: WOVF acknowledge */
 423                         ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x33,
 424                                                TWL4030_BCIWDKEY);
 425                         /* 0x24 + EKEY6: off mode */
 426                         ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x2a,
 427                                                TWL4030_BCIMDKEY);
 428                         /* EKEY2: Linear charge: USB path */
 429                         ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x26,
 430                                                TWL4030_BCIMDKEY);
 431                         /* WDKEY5: stop watchdog count */
 432                         ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xf3,
 433                                                TWL4030_BCIWDKEY);
 434                         /* enable MFEN3 access */
 435                         ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x9c,
 436                                                TWL4030_BCIMFKEY);
 437                          /* ICHGEOCEN - end-of-charge monitor (current < 80mA)
 438                           *                      (charging continues)
 439                           * ICHGLOWEN - current level monitor (charge continues)
 440                           * don't monitor over-current or heat save
 441                           */
 442                         ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xf0,
 443                                                TWL4030_BCIMFEN3);
 444                 }
 445         } else {
 446                 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOUSB, 0);
 447                 ret |= twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x2a,
 448                                         TWL4030_BCIMDKEY);
 449                 if (bci->usb_enabled) {
 450                         pm_runtime_mark_last_busy(bci->transceiver->dev);
 451                         pm_runtime_put_autosuspend(bci->transceiver->dev);
 452                         bci->usb_enabled = 0;
 453                 }
 454         }
 455
 456         return ret;
 457 }
 458
 459 /*
 460  * Enable/Disable AC Charge funtionality.
 461  */
 462 static int twl4030_charger_enable_ac(bool enable)
 463 {
 464         int ret;
 465
 466         if (enable)
 467                 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOAC);
 468         else
 469                 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC, 0);
 470
 471         return ret;
 472 }
 473
 474 /*
 475  * Enable/Disable charging of Backup Battery.
 476  */
 477 static int twl4030_charger_enable_backup(int uvolt, int uamp)
 478 {
 479         int ret;
 480         u8 flags;
 481
 482         if (uvolt < 2500000 ||
 483             uamp < 25) {
 484                 /* disable charging of backup battery */
 485                 ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER,
 486                                         TWL4030_BBCHEN, 0, TWL4030_BB_CFG);
 487                 return ret;
 488         }
 489
 490         flags = TWL4030_BBCHEN;
 491         if (uvolt >= 3200000)
 492                 flags |= TWL4030_BBSEL_3V2;
 493         else if (uvolt >= 3100000)
 494                 flags |= TWL4030_BBSEL_3V1;
 495         else if (uvolt >= 3000000)
 496                 flags |= TWL4030_BBSEL_3V0;
 497         else
 498                 flags |= TWL4030_BBSEL_2V5;
 499
 500         if (uamp >= 1000)
 501                 flags |= TWL4030_BBISEL_1000uA;
 502         else if (uamp >= 500)
 503                 flags |= TWL4030_BBISEL_500uA;
 504         else if (uamp >= 150)
 505                 flags |= TWL4030_BBISEL_150uA;
 506         else
 507                 flags |= TWL4030_BBISEL_25uA;
 508
 509         ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER,
 510                                 TWL4030_BBSEL_MASK | TWL4030_BBISEL_MASK,
 511                                 flags,
 512                                 TWL4030_BB_CFG);
 513
 514         return ret;
 515 }
 516
 517 /*
 518  * TWL4030 CHG_PRES (AC charger presence) events
 519  */
 520 static irqreturn_t twl4030_charger_interrupt(int irq, void *arg)
 521 {
 522         struct twl4030_bci *bci = arg;
 523
 524         dev_dbg(bci->dev, "CHG_PRES irq\n");
 525         /* reset current on each 'plug' event */
 526         bci->ac_cur = 500000;
 527         twl4030_charger_update_current(bci);
 528         power_supply_changed(bci->ac);
 529         power_supply_changed(bci->usb);
 530
 531         return IRQ_HANDLED;
 532 }
 533
 534 /*
 535  * TWL4030 BCI monitoring events
 536  */
 537 static irqreturn_t twl4030_bci_interrupt(int irq, void *arg)
 538 {
 539         struct twl4030_bci *bci = arg;
 540         u8 irqs1, irqs2;
 541         int ret;
 542
 543         ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs1,
 544                               TWL4030_INTERRUPTS_BCIISR1A);
 545         if (ret < 0)
 546                 return IRQ_HANDLED;
 547
 548         ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs2,
 549                               TWL4030_INTERRUPTS_BCIISR2A);
 550         if (ret < 0)
 551                 return IRQ_HANDLED;
 552
 553         dev_dbg(bci->dev, "BCI irq %02x %02x\n", irqs2, irqs1);
 554
 555         if (irqs1 & (TWL4030_ICHGLOW | TWL4030_ICHGEOC)) {
 556                 /* charger state change, inform the core */
 557                 power_supply_changed(bci->ac);
 558                 power_supply_changed(bci->usb);
 559         }
 560         twl4030_charger_update_current(bci);
 561
 562         /* various monitoring events, for now we just log them here */
 563         if (irqs1 & (TWL4030_TBATOR2 | TWL4030_TBATOR1))
 564                 dev_warn(bci->dev, "battery temperature out of range\n");
 565
 566         if (irqs1 & TWL4030_BATSTS)
 567                 dev_crit(bci->dev, "battery disconnected\n");
 568
 569         if (irqs2 & TWL4030_VBATOV)
 570                 dev_crit(bci->dev, "VBAT overvoltage\n");
 571
 572         if (irqs2 & TWL4030_VBUSOV)
 573                 dev_crit(bci->dev, "VBUS overvoltage\n");
 574
 575         if (irqs2 & TWL4030_ACCHGOV)
 576                 dev_crit(bci->dev, "Ac charger overvoltage\n");
 577
 578         return IRQ_HANDLED;
 579 }
 580
 581 /*
 582  * Provide "max_current" attribute in sysfs.
 583  */
 584 static ssize_t
 585 twl4030_bci_max_current_store(struct device *dev, struct device_attribute *attr,
 586         const char *buf, size_t n)
 587 {
 588         struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
 589         int cur = 0;
 590         int status = 0;
 591         status = kstrtoint(buf, 10, &cur);
 592         if (status)
 593                 return status;
 594         if (cur < 0)
 595                 return -EINVAL;
 596         if (dev == &bci->ac->dev)
 597                 bci->ac_cur = cur;
 598         else
 599                 bci->usb_cur = cur;
 600
 601         twl4030_charger_update_current(bci);
 602         return n;
 603 }
 604
 605 /*
 606  * sysfs max_current show
 607  */
 608 static ssize_t twl4030_bci_max_current_show(struct device *dev,
 609         struct device_attribute *attr, char *buf)
 610 {
 611         int status = 0;
 612         int cur = -1;
 613         u8 bcictl1;
 614         struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
 615
 616         if (dev == &bci->ac->dev) {
 617                 if (!bci->ac_is_active)
 618                         cur = bci->ac_cur;
 619         } else {
 620                 if (bci->ac_is_active)
 621                         cur = bci->usb_cur;
 622         }
 623         if (cur < 0) {
 624                 cur = twl4030bci_read_adc_val(TWL4030_BCIIREF1);
 625                 if (cur < 0)
 626                         return cur;
 627                 status = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
 628                 if (status < 0)
 629                         return status;
 630                 cur = regval2ua(cur, bcictl1 & TWL4030_CGAIN);
 631         }
 632         return scnprintf(buf, PAGE_SIZE, "%u\n", cur);
 633 }
 634
 635 static DEVICE_ATTR(max_current, 0644, twl4030_bci_max_current_show,
 636                         twl4030_bci_max_current_store);
 637
 638 static void twl4030_bci_usb_work(struct work_struct *data)
 639 {
 640         struct twl4030_bci *bci = container_of(data, struct twl4030_bci, work);
 641
 642         switch (bci->event) {
 643         case USB_EVENT_VBUS:
 644         case USB_EVENT_CHARGER:
 645                 twl4030_charger_enable_usb(bci, true);
 646                 break;
 647         case USB_EVENT_NONE:
 648                 twl4030_charger_enable_usb(bci, false);
 649                 break;
 650         }
 651 }
 652
 653 static int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val,
 654                                void *priv)
 655 {
 656         struct twl4030_bci *bci = container_of(nb, struct twl4030_bci, usb_nb);
 657
 658         dev_dbg(bci->dev, "OTG notify %lu\n", val);
 659
 660         /* reset current on each 'plug' event */
 661         if (allow_usb)
 662                 bci->usb_cur = 500000;
 663         else
 664                 bci->usb_cur = 100000;
 665
 666         bci->event = val;
 667         schedule_work(&bci->work);
 668
 669         return NOTIFY_OK;
 670 }
 671
 672 /*
 673  * sysfs charger enabled store
 674  */
 675 static ssize_t
 676 twl4030_bci_mode_store(struct device *dev, struct device_attribute *attr,
 677                           const char *buf, size_t n)
 678 {
 679         struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
 680         int mode;
 681         int status;
 682
 683         if (sysfs_streq(buf, modes[0]))
 684                 mode = 0;
 685         else if (sysfs_streq(buf, modes[1]))
 686                 mode = 1;
 687         else if (sysfs_streq(buf, modes[2]))
 688                 mode = 2;
 689         else
 690                 return -EINVAL;
 691         twl4030_charger_enable_usb(bci, false);
 692         bci->usb_mode = mode;
 693         status = twl4030_charger_enable_usb(bci, true);
 694         return (status == 0) ? n : status;
 695 }
 696
 697 /*
 698  * sysfs charger enabled show
 699  */
 700 static ssize_t
 701 twl4030_bci_mode_show(struct device *dev,
 702                              struct device_attribute *attr, char *buf)
 703 {
 704         struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
 705         int len = 0;
 706         int i;
 707
 708         for (i = 0; i < ARRAY_SIZE(modes); i++)
 709                 if (bci->usb_mode == i)
 710                         len += snprintf(buf+len, PAGE_SIZE-len,
 711                                         "[%s] ", modes[i]);
 712                 else
 713                         len += snprintf(buf+len, PAGE_SIZE-len,
 714                                         "%s ", modes[i]);
 715         buf[len-1] = '\n';
 716         return len;
 717 }
 718 static DEVICE_ATTR(mode, 0644, twl4030_bci_mode_show,
 719                    twl4030_bci_mode_store);
 720
 721 static int twl4030_charger_get_current(void)
 722 {
 723         int curr;
 724         int ret;
 725         u8 bcictl1;
 726
 727         curr = twl4030bci_read_adc_val(TWL4030_BCIICHG);
 728         if (curr < 0)
 729                 return curr;
 730
 731         ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
 732         if (ret)
 733                 return ret;
 734
 735         return regval2ua(curr, bcictl1 & TWL4030_CGAIN);
 736 }
 737
 738 /*
 739  * Returns the main charge FSM state
 740  * Or < 0 on failure.
 741  */
 742 static int twl4030bci_state(struct twl4030_bci *bci)
 743 {
 744         int ret;
 745         u8 state;
 746
 747         ret = twl4030_bci_read(TWL4030_BCIMSTATEC, &state);
 748         if (ret) {
 749                 pr_err("twl4030_bci: error reading BCIMSTATEC\n");
 750                 return ret;
 751         }
 752
 753         dev_dbg(bci->dev, "state: %02x\n", state);
 754
 755         return state;
 756 }
 757
 758 static int twl4030_bci_state_to_status(int state)
 759 {
 760         state &= TWL4030_MSTATEC_MASK;
 761         if (TWL4030_MSTATEC_QUICK1 <= state && state <= TWL4030_MSTATEC_QUICK7)
 762                 return POWER_SUPPLY_STATUS_CHARGING;
 763         else if (TWL4030_MSTATEC_COMPLETE1 <= state &&
 764                                         state <= TWL4030_MSTATEC_COMPLETE4)
 765                 return POWER_SUPPLY_STATUS_FULL;
 766         else
 767                 return POWER_SUPPLY_STATUS_NOT_CHARGING;
 768 }
 769
 770 static int twl4030_bci_get_property(struct power_supply *psy,
 771                                     enum power_supply_property psp,
 772                                     union power_supply_propval *val)
 773 {
 774         struct twl4030_bci *bci = dev_get_drvdata(psy->dev.parent);
 775         int is_charging;
 776         int state;
 777         int ret;
 778
 779         state = twl4030bci_state(bci);
 780         if (state < 0)
 781                 return state;
 782
 783         if (psy->desc->type == POWER_SUPPLY_TYPE_USB)
 784                 is_charging = state & TWL4030_MSTATEC_USB;
 785         else
 786                 is_charging = state & TWL4030_MSTATEC_AC;
 787         if (!is_charging) {
 788                 u8 s;
 789                 twl4030_bci_read(TWL4030_BCIMDEN, &s);
 790                 if (psy->desc->type == POWER_SUPPLY_TYPE_USB)
 791                         is_charging = s & 1;
 792                 else
 793                         is_charging = s & 2;
 794                 if (is_charging)
 795                         /* A little white lie */
 796                         state = TWL4030_MSTATEC_QUICK1;
 797         }
 798
 799         switch (psp) {
 800         case POWER_SUPPLY_PROP_STATUS:
 801                 if (is_charging)
 802                         val->intval = twl4030_bci_state_to_status(state);
 803                 else
 804                         val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
 805                 break;
 806         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 807                 /* charging must be active for meaningful result */
 808                 if (!is_charging)
 809                         return -ENODATA;
 810                 if (psy->desc->type == POWER_SUPPLY_TYPE_USB) {
 811                         ret = twl4030bci_read_adc_val(TWL4030_BCIVBUS);
 812                         if (ret < 0)
 813                                 return ret;
 814                         /* BCIVBUS uses ADCIN8, 7/1023 V/step */
 815                         val->intval = ret * 6843;
 816                 } else {
 817                         ret = twl4030bci_read_adc_val(TWL4030_BCIVAC);
 818                         if (ret < 0)
 819                                 return ret;
 820                         /* BCIVAC uses ADCIN11, 10/1023 V/step */
 821                         val->intval = ret * 9775;
 822                 }
 823                 break;
 824         case POWER_SUPPLY_PROP_CURRENT_NOW:
 825                 if (!is_charging)
 826                         return -ENODATA;
 827                 /* current measurement is shared between AC and USB */
 828                 ret = twl4030_charger_get_current();
 829                 if (ret < 0)
 830                         return ret;
 831                 val->intval = ret;
 832                 break;
 833         case POWER_SUPPLY_PROP_ONLINE:
 834                 val->intval = is_charging &&
 835                         twl4030_bci_state_to_status(state) !=
 836                                 POWER_SUPPLY_STATUS_NOT_CHARGING;
 837                 break;
 838         default:
 839                 return -EINVAL;
 840         }
 841
 842         return 0;
 843 }
 844
 845 static enum power_supply_property twl4030_charger_props[] = {
 846         POWER_SUPPLY_PROP_STATUS,
 847         POWER_SUPPLY_PROP_ONLINE,
 848         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 849         POWER_SUPPLY_PROP_CURRENT_NOW,
 850 };
 851
 852 #ifdef CONFIG_OF
 853 static const struct twl4030_bci_platform_data *
 854 twl4030_bci_parse_dt(struct device *dev)
 855 {
 856         struct device_node *np = dev->of_node;
 857         struct twl4030_bci_platform_data *pdata;
 858         u32 num;
 859
 860         if (!np)
 861                 return NULL;
 862         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 863         if (!pdata)
 864                 return pdata;
 865
 866         if (of_property_read_u32(np, "ti,bb-uvolt", &num) == 0)
 867                 pdata->bb_uvolt = num;
 868         if (of_property_read_u32(np, "ti,bb-uamp", &num) == 0)
 869                 pdata->bb_uamp = num;
 870         return pdata;
 871 }
 872 #else
 873 static inline const struct twl4030_bci_platform_data *
 874 twl4030_bci_parse_dt(struct device *dev)
 875 {
 876         return NULL;
 877 }
 878 #endif
 879
 880 static const struct power_supply_desc twl4030_bci_ac_desc = {
 881         .name           = "twl4030_ac",
 882         .type           = POWER_SUPPLY_TYPE_MAINS,
 883         .properties     = twl4030_charger_props,
 884         .num_properties = ARRAY_SIZE(twl4030_charger_props),
 885         .get_property   = twl4030_bci_get_property,
 886 };
 887
 888 static const struct power_supply_desc twl4030_bci_usb_desc = {
 889         .name           = "twl4030_usb",
 890         .type           = POWER_SUPPLY_TYPE_USB,
 891         .properties     = twl4030_charger_props,
 892         .num_properties = ARRAY_SIZE(twl4030_charger_props),
 893         .get_property   = twl4030_bci_get_property,
 894 };
 895
 896 static int twl4030_bci_probe(struct platform_device *pdev)
 897 {
 898         struct twl4030_bci *bci;
 899         const struct twl4030_bci_platform_data *pdata = pdev->dev.platform_data;
 900         int ret;
 901         u32 reg;
 902
 903         bci = devm_kzalloc(&pdev->dev, sizeof(*bci), GFP_KERNEL);
 904         if (bci == NULL)
 905                 return -ENOMEM;
 906
 907         if (!pdata)
 908                 pdata = twl4030_bci_parse_dt(&pdev->dev);
 909
 910         bci->ichg_eoc = 80100; /* Stop charging when current drops to here */
 911         bci->ichg_lo = 241000; /* Low threshold */
 912         bci->ichg_hi = 500000; /* High threshold */
 913         bci->ac_cur = 500000; /* 500mA */
 914         if (allow_usb)
 915                 bci->usb_cur = 500000;  /* 500mA */
 916         else
 917                 bci->usb_cur = 100000;  /* 100mA */
 918         bci->usb_mode = CHARGE_AUTO;
 919
 920         bci->dev = &pdev->dev;
 921         bci->irq_chg = platform_get_irq(pdev, 0);
 922         bci->irq_bci = platform_get_irq(pdev, 1);
 923
 924         /* Only proceed further *IF* battery is physically present */
 925         ret = twl4030_is_battery_present(bci);
 926         if  (ret) {
 927                 dev_crit(&pdev->dev, "Battery was not detected:%d\n", ret);
 928                 return ret;
 929         }
 930
 931         platform_set_drvdata(pdev, bci);
 932
 933         bci->ac = devm_power_supply_register(&pdev->dev, &twl4030_bci_ac_desc,
 934                                              NULL);
 935         if (IS_ERR(bci->ac)) {
 936                 ret = PTR_ERR(bci->ac);
 937                 dev_err(&pdev->dev, "failed to register ac: %d\n", ret);
 938                 return ret;
 939         }
 940
 941         bci->usb = devm_power_supply_register(&pdev->dev, &twl4030_bci_usb_desc,
 942                                               NULL);
 943         if (IS_ERR(bci->usb)) {
 944                 ret = PTR_ERR(bci->usb);
 945                 dev_err(&pdev->dev, "failed to register usb: %d\n", ret);
 946                 return ret;
 947         }
 948
 949         ret = devm_request_threaded_irq(&pdev->dev, bci->irq_chg, NULL,
 950                         twl4030_charger_interrupt, IRQF_ONESHOT, pdev->name,
 951                         bci);
 952         if (ret < 0) {
 953                 dev_err(&pdev->dev, "could not request irq %d, status %d\n",
 954                         bci->irq_chg, ret);
 955                 return ret;
 956         }
 957
 958         ret = devm_request_threaded_irq(&pdev->dev, bci->irq_bci, NULL,
 959                         twl4030_bci_interrupt, IRQF_ONESHOT, pdev->name, bci);
 960         if (ret < 0) {
 961                 dev_err(&pdev->dev, "could not request irq %d, status %d\n",
 962                         bci->irq_bci, ret);
 963                 return ret;
 964         }
 965
 966         INIT_WORK(&bci->work, twl4030_bci_usb_work);
 967
 968         bci->usb_nb.notifier_call = twl4030_bci_usb_ncb;
 969         if (bci->dev->of_node) {
 970                 struct device_node *phynode;
 971
 972                 phynode = of_find_compatible_node(bci->dev->of_node->parent,
 973                                                   NULL, "ti,twl4030-usb");
 974                 if (phynode) {
 975                         bci->transceiver = devm_usb_get_phy_by_node(
 976                                 bci->dev, phynode, &bci->usb_nb);
 977                         if (IS_ERR(bci->transceiver) &&
 978                             PTR_ERR(bci->transceiver) == -EPROBE_DEFER)
 979                                 return -EPROBE_DEFER;
 980                 }
 981         }
 982
 983         /* Enable interrupts now. */
 984         reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_ICHGEOC | TWL4030_TBATOR2 |
 985                 TWL4030_TBATOR1 | TWL4030_BATSTS);
 986         ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
 987                                TWL4030_INTERRUPTS_BCIIMR1A);
 988         if (ret < 0) {
 989                 dev_err(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
 990                 return ret;
 991         }
 992
 993         reg = ~(u32)(TWL4030_VBATOV | TWL4030_VBUSOV | TWL4030_ACCHGOV);
 994         ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
 995                                TWL4030_INTERRUPTS_BCIIMR2A);
 996         if (ret < 0)
 997                 dev_warn(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
 998
 999         twl4030_charger_update_current(bci);
1000         if (device_create_file(&bci->usb->dev, &dev_attr_max_current))
1001                 dev_warn(&pdev->dev, "could not create sysfs file\n");
1002         if (device_create_file(&bci->usb->dev, &dev_attr_mode))
1003                 dev_warn(&pdev->dev, "could not create sysfs file\n");
1004         if (device_create_file(&bci->ac->dev, &dev_attr_max_current))
1005                 dev_warn(&pdev->dev, "could not create sysfs file\n");
1006
1007         twl4030_charger_enable_ac(true);
1008         if (!IS_ERR_OR_NULL(bci->transceiver))
1009                 twl4030_bci_usb_ncb(&bci->usb_nb,
1010                                     bci->transceiver->last_event,
1011                                     NULL);
1012         else
1013                 twl4030_charger_enable_usb(bci, false);
1014         if (pdata)
1015                 twl4030_charger_enable_backup(pdata->bb_uvolt,
1016                                               pdata->bb_uamp);
1017         else
1018                 twl4030_charger_enable_backup(0, 0);
1019
1020         return 0;
1021 }
1022
1023 static int __exit twl4030_bci_remove(struct platform_device *pdev)
1024 {
1025         struct twl4030_bci *bci = platform_get_drvdata(pdev);
1026
1027         twl4030_charger_enable_ac(false);
1028         twl4030_charger_enable_usb(bci, false);
1029         twl4030_charger_enable_backup(0, 0);
1030
1031         device_remove_file(&bci->usb->dev, &dev_attr_max_current);
1032         device_remove_file(&bci->usb->dev, &dev_attr_mode);
1033         device_remove_file(&bci->ac->dev, &dev_attr_max_current);
1034         /* mask interrupts */
1035         twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
1036                          TWL4030_INTERRUPTS_BCIIMR1A);
1037         twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
1038                          TWL4030_INTERRUPTS_BCIIMR2A);
1039
1040         return 0;
1041 }
1042
1043 static const struct of_device_id twl_bci_of_match[] = {
1044         {.compatible = "ti,twl4030-bci", },
1045         { }
1046 };
1047 MODULE_DEVICE_TABLE(of, twl_bci_of_match);
1048
1049 static struct platform_driver twl4030_bci_driver = {
1050         .probe = twl4030_bci_probe,
1051         .driver = {
1052                 .name   = "twl4030_bci",
1053                 .of_match_table = of_match_ptr(twl_bci_of_match),
1054         },
1055         .remove = __exit_p(twl4030_bci_remove),
1056 };
1057 module_platform_driver(twl4030_bci_driver);
1058
1059 MODULE_AUTHOR("Gražvydas Ignotas");
1060 MODULE_DESCRIPTION("TWL4030 Battery Charger Interface driver");
1061 MODULE_LICENSE("GPL");
1062 MODULE_ALIAS("platform:twl4030_bci");