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/iio/consumer.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 /*
  95  * If AC (Accessory Charger) voltage exceeds 4.5V (MADC 11)
  96  * then AC is available.
  97  */
  98 static inline int ac_available(struct iio_channel *channel_vac)
  99 {
 100         int val, err;
 101
 102         if (!channel_vac)
 103                 return 0;
 104
 105         err = iio_read_channel_processed(channel_vac, &val);
 106         if (err < 0)
 107                 return 0;
 108         return val > 4500;
 109 }
 110
 111 static bool allow_usb;
 112 module_param(allow_usb, bool, 0644);
 113 MODULE_PARM_DESC(allow_usb, "Allow USB charge drawing default current");
 114
 115 struct twl4030_bci {
 116         struct device           *dev;
 117         struct power_supply     *ac;
 118         struct power_supply     *usb;
 119         struct usb_phy          *transceiver;
 120         struct notifier_block   usb_nb;
 121         struct work_struct      work;
 122         int                     irq_chg;
 123         int                     irq_bci;
 124         int                     usb_enabled;
 125
 126         /*
 127          * ichg_* and *_cur values in uA. If any are 'large', we set
 128          * CGAIN to '1' which doubles the range for half the
 129          * precision.
 130          */
 131         unsigned int            ichg_eoc, ichg_lo, ichg_hi;
 132         unsigned int            usb_cur, ac_cur;
 133         struct iio_channel      *channel_vac;
 134         bool                    ac_is_active;
 135         int                     usb_mode, ac_mode; /* charging mode requested */
 136 #define CHARGE_OFF      0
 137 #define CHARGE_AUTO     1
 138 #define CHARGE_LINEAR   2
 139
 140         /* When setting the USB current we slowly increase the
 141          * requested current until target is reached or the voltage
 142          * drops below 4.75V.  In the latter case we step back one
 143          * step.
 144          */
 145         unsigned int            usb_cur_target;
 146         struct delayed_work     current_worker;
 147 #define USB_CUR_STEP    20000   /* 20mA at a time */
 148 #define USB_MIN_VOLT    4750000 /* 4.75V */
 149 #define USB_CUR_DELAY   msecs_to_jiffies(100)
 150 #define USB_MAX_CURRENT 1700000 /* TWL4030 caps at 1.7A */
 151
 152         unsigned long           event;
 153 };
 154
 155 /* strings for 'usb_mode' values */
 156 static char *modes[] = { "off", "auto", "continuous" };
 157
 158 /*
 159  * clear and set bits on an given register on a given module
 160  */
 161 static int twl4030_clear_set(u8 mod_no, u8 clear, u8 set, u8 reg)
 162 {
 163         u8 val = 0;
 164         int ret;
 165
 166         ret = twl_i2c_read_u8(mod_no, &val, reg);
 167         if (ret)
 168                 return ret;
 169
 170         val &= ~clear;
 171         val |= set;
 172
 173         return twl_i2c_write_u8(mod_no, val, reg);
 174 }
 175
 176 static int twl4030_bci_read(u8 reg, u8 *val)
 177 {
 178         return twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, val, reg);
 179 }
 180
 181 static int twl4030_clear_set_boot_bci(u8 clear, u8 set)
 182 {
 183         return twl4030_clear_set(TWL_MODULE_PM_MASTER, clear,
 184                         TWL4030_CONFIG_DONE | TWL4030_BCIAUTOWEN | set,
 185                         TWL4030_PM_MASTER_BOOT_BCI);
 186 }
 187
 188 static int twl4030bci_read_adc_val(u8 reg)
 189 {
 190         int ret, temp;
 191         u8 val;
 192
 193         /* read MSB */
 194         ret = twl4030_bci_read(reg + 1, &val);
 195         if (ret)
 196                 return ret;
 197
 198         temp = (int)(val & 0x03) << 8;
 199
 200         /* read LSB */
 201         ret = twl4030_bci_read(reg, &val);
 202         if (ret)
 203                 return ret;
 204
 205         return temp | val;
 206 }
 207
 208 /*
 209  * Check if Battery Pack was present
 210  */
 211 static int twl4030_is_battery_present(struct twl4030_bci *bci)
 212 {
 213         int ret;
 214         u8 val = 0;
 215
 216         /* Battery presence in Main charge? */
 217         ret = twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, &val, TWL4030_BCIMFSTS3);
 218         if (ret)
 219                 return ret;
 220         if (val & TWL4030_BATSTSMCHG)
 221                 return 0;
 222
 223         /*
 224          * OK, It could be that bootloader did not enable main charger,
 225          * pre-charge is h/w auto. So, Battery presence in Pre-charge?
 226          */
 227         ret = twl_i2c_read_u8(TWL4030_MODULE_PRECHARGE, &val,
 228                               TWL4030_BCIMFSTS1);
 229         if (ret)
 230                 return ret;
 231         if (val & TWL4030_BATSTSPCHG)
 232                 return 0;
 233
 234         return -ENODEV;
 235 }
 236
 237 /*
 238  * TI provided formulas:
 239  * CGAIN == 0: ICHG = (BCIICHG * 1.7) / (2^10 - 1) - 0.85
 240  * CGAIN == 1: ICHG = (BCIICHG * 3.4) / (2^10 - 1) - 1.7
 241  * Here we use integer approximation of:
 242  * CGAIN == 0: val * 1.6618 - 0.85 * 1000
 243  * CGAIN == 1: (val * 1.6618 - 0.85 * 1000) * 2
 244  */
 245 /*
 246  * convert twl register value for currents into uA
 247  */
 248 static int regval2ua(int regval, bool cgain)
 249 {
 250         if (cgain)
 251                 return (regval * 16618 - 8500 * 1000) / 5;
 252         else
 253                 return (regval * 16618 - 8500 * 1000) / 10;
 254 }
 255
 256 /*
 257  * convert uA currents into twl register value
 258  */
 259 static int ua2regval(int ua, bool cgain)
 260 {
 261         int ret;
 262         if (cgain)
 263                 ua /= 2;
 264         ret = (ua * 10 + 8500 * 1000) / 16618;
 265         /* rounding problems */
 266         if (ret < 512)
 267                 ret = 512;
 268         return ret;
 269 }
 270
 271 static int twl4030_charger_update_current(struct twl4030_bci *bci)
 272 {
 273         int status;
 274         int cur;
 275         unsigned reg, cur_reg;
 276         u8 bcictl1, oldreg, fullreg;
 277         bool cgain = false;
 278         u8 boot_bci;
 279
 280         /*
 281          * If AC (Accessory Charger) voltage exceeds 4.5V (MADC 11)
 282          * and AC is enabled, set current for 'ac'
 283          */
 284         if (ac_available(bci->channel_vac)) {
 285                 cur = bci->ac_cur;
 286                 bci->ac_is_active = true;
 287         } else {
 288                 cur = bci->usb_cur;
 289                 bci->ac_is_active = false;
 290                 if (cur > bci->usb_cur_target) {
 291                         cur = bci->usb_cur_target;
 292                         bci->usb_cur = cur;
 293                 }
 294                 if (cur < bci->usb_cur_target)
 295                         schedule_delayed_work(&bci->current_worker, USB_CUR_DELAY);
 296         }
 297
 298         /* First, check thresholds and see if cgain is needed */
 299         if (bci->ichg_eoc >= 200000)
 300                 cgain = true;
 301         if (bci->ichg_lo >= 400000)
 302                 cgain = true;
 303         if (bci->ichg_hi >= 820000)
 304                 cgain = true;
 305         if (cur > 852000)
 306                 cgain = true;
 307
 308         status = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
 309         if (status < 0)
 310                 return status;
 311         if (twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &boot_bci,
 312                             TWL4030_PM_MASTER_BOOT_BCI) < 0)
 313                 boot_bci = 0;
 314         boot_bci &= 7;
 315
 316         if ((!!cgain) != !!(bcictl1 & TWL4030_CGAIN))
 317                 /* Need to turn for charging while we change the
 318                  * CGAIN bit.  Leave it off while everything is
 319                  * updated.
 320                  */
 321                 twl4030_clear_set_boot_bci(boot_bci, 0);
 322
 323         /*
 324          * For ichg_eoc, the hardware only supports reg values matching
 325          * 100XXXX000, and requires the XXXX be stored in the high nibble
 326          * of TWL4030_BCIMFTH8.
 327          */
 328         reg = ua2regval(bci->ichg_eoc, cgain);
 329         if (reg > 0x278)
 330                 reg = 0x278;
 331         if (reg < 0x200)
 332                 reg = 0x200;
 333         reg = (reg >> 3) & 0xf;
 334         fullreg = reg << 4;
 335
 336         /*
 337          * For ichg_lo, reg value must match 10XXXX0000.
 338          * XXXX is stored in low nibble of TWL4030_BCIMFTH8.
 339          */
 340         reg = ua2regval(bci->ichg_lo, cgain);
 341         if (reg > 0x2F0)
 342                 reg = 0x2F0;
 343         if (reg < 0x200)
 344                 reg = 0x200;
 345         reg = (reg >> 4) & 0xf;
 346         fullreg |= reg;
 347
 348         /* ichg_eoc and ichg_lo live in same register */
 349         status = twl4030_bci_read(TWL4030_BCIMFTH8, &oldreg);
 350         if (status < 0)
 351                 return status;
 352         if (oldreg != fullreg) {
 353                 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xF4,
 354                                           TWL4030_BCIMFKEY);
 355                 if (status < 0)
 356                         return status;
 357                 twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
 358                                  fullreg, TWL4030_BCIMFTH8);
 359         }
 360
 361         /* ichg_hi threshold must be 1XXXX01100 (I think) */
 362         reg = ua2regval(bci->ichg_hi, cgain);
 363         if (reg > 0x3E0)
 364                 reg = 0x3E0;
 365         if (reg < 0x200)
 366                 reg = 0x200;
 367         fullreg = (reg >> 5) & 0xF;
 368         fullreg <<= 4;
 369         status = twl4030_bci_read(TWL4030_BCIMFTH9, &oldreg);
 370         if (status < 0)
 371                 return status;
 372         if ((oldreg & 0xF0) != fullreg) {
 373                 fullreg |= (oldreg & 0x0F);
 374                 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7,
 375                                           TWL4030_BCIMFKEY);
 376                 if (status < 0)
 377                         return status;
 378                 twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
 379                                  fullreg, TWL4030_BCIMFTH9);
 380         }
 381
 382         /*
 383          * And finally, set the current.  This is stored in
 384          * two registers.
 385          */
 386         reg = ua2regval(cur, cgain);
 387         /* we have only 10 bits */
 388         if (reg > 0x3ff)
 389                 reg = 0x3ff;
 390         status = twl4030_bci_read(TWL4030_BCIIREF1, &oldreg);
 391         if (status < 0)
 392                 return status;
 393         cur_reg = oldreg;
 394         status = twl4030_bci_read(TWL4030_BCIIREF2, &oldreg);
 395         if (status < 0)
 396                 return status;
 397         cur_reg |= oldreg << 8;
 398         if (reg != oldreg) {
 399                 /* disable write protection for one write access for
 400                  * BCIIREF */
 401                 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7,
 402                                           TWL4030_BCIMFKEY);
 403                 if (status < 0)
 404                         return status;
 405                 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
 406                                           (reg & 0x100) ? 3 : 2,
 407                                           TWL4030_BCIIREF2);
 408                 if (status < 0)
 409                         return status;
 410                 /* disable write protection for one write access for
 411                  * BCIIREF */
 412                 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7,
 413                                           TWL4030_BCIMFKEY);
 414                 if (status < 0)
 415                         return status;
 416                 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
 417                                           reg & 0xff,
 418                                           TWL4030_BCIIREF1);
 419         }
 420         if ((!!cgain) != !!(bcictl1 & TWL4030_CGAIN)) {
 421                 /* Flip CGAIN and re-enable charging */
 422                 bcictl1 ^= TWL4030_CGAIN;
 423                 twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
 424                                  bcictl1, TWL4030_BCICTL1);
 425                 twl4030_clear_set_boot_bci(0, boot_bci);
 426         }
 427         return 0;
 428 }
 429
 430 static int twl4030_charger_get_current(void);
 431
 432 static void twl4030_current_worker(struct work_struct *data)
 433 {
 434         int v, curr;
 435         int res;
 436         struct twl4030_bci *bci = container_of(data, struct twl4030_bci,
 437                                                current_worker.work);
 438
 439         res = twl4030bci_read_adc_val(TWL4030_BCIVBUS);
 440         if (res < 0)
 441                 v = 0;
 442         else
 443                 /* BCIVBUS uses ADCIN8, 7/1023 V/step */
 444                 v = res * 6843;
 445         curr = twl4030_charger_get_current();
 446
 447         dev_dbg(bci->dev, "v=%d cur=%d limit=%d target=%d\n", v, curr,
 448                 bci->usb_cur, bci->usb_cur_target);
 449
 450         if (v < USB_MIN_VOLT) {
 451                 /* Back up and stop adjusting. */
 452                 bci->usb_cur -= USB_CUR_STEP;
 453                 bci->usb_cur_target = bci->usb_cur;
 454         } else if (bci->usb_cur >= bci->usb_cur_target ||
 455                    bci->usb_cur + USB_CUR_STEP > USB_MAX_CURRENT) {
 456                 /* Reached target and voltage is OK - stop */
 457                 return;
 458         } else {
 459                 bci->usb_cur += USB_CUR_STEP;
 460                 schedule_delayed_work(&bci->current_worker, USB_CUR_DELAY);
 461         }
 462         twl4030_charger_update_current(bci);
 463 }
 464
 465 /*
 466  * Enable/Disable USB Charge functionality.
 467  */
 468 static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
 469 {
 470         int ret;
 471
 472         if (bci->usb_mode == CHARGE_OFF)
 473                 enable = false;
 474         if (enable && !IS_ERR_OR_NULL(bci->transceiver)) {
 475
 476                 twl4030_charger_update_current(bci);
 477
 478                 /* Need to keep phy powered */
 479                 if (!bci->usb_enabled) {
 480                         pm_runtime_get_sync(bci->transceiver->dev);
 481                         bci->usb_enabled = 1;
 482                 }
 483
 484                 if (bci->usb_mode == CHARGE_AUTO)
 485                         /* forcing the field BCIAUTOUSB (BOOT_BCI[1]) to 1 */
 486                         ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOUSB);
 487
 488                 /* forcing USBFASTMCHG(BCIMFSTS4[2]) to 1 */
 489                 ret = twl4030_clear_set(TWL_MODULE_MAIN_CHARGE, 0,
 490                         TWL4030_USBFASTMCHG, TWL4030_BCIMFSTS4);
 491                 if (bci->usb_mode == CHARGE_LINEAR) {
 492                         twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC|TWL4030_CVENAC, 0);
 493                         /* Watch dog key: WOVF acknowledge */
 494                         ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x33,
 495                                                TWL4030_BCIWDKEY);
 496                         /* 0x24 + EKEY6: off mode */
 497                         ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x2a,
 498                                                TWL4030_BCIMDKEY);
 499                         /* EKEY2: Linear charge: USB path */
 500                         ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x26,
 501                                                TWL4030_BCIMDKEY);
 502                         /* WDKEY5: stop watchdog count */
 503                         ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xf3,
 504                                                TWL4030_BCIWDKEY);
 505                         /* enable MFEN3 access */
 506                         ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x9c,
 507                                                TWL4030_BCIMFKEY);
 508                          /* ICHGEOCEN - end-of-charge monitor (current < 80mA)
 509                           *                      (charging continues)
 510                           * ICHGLOWEN - current level monitor (charge continues)
 511                           * don't monitor over-current or heat save
 512                           */
 513                         ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xf0,
 514                                                TWL4030_BCIMFEN3);
 515                 }
 516         } else {
 517                 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOUSB, 0);
 518                 ret |= twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x2a,
 519                                         TWL4030_BCIMDKEY);
 520                 if (bci->usb_enabled) {
 521                         pm_runtime_mark_last_busy(bci->transceiver->dev);
 522                         pm_runtime_put_autosuspend(bci->transceiver->dev);
 523                         bci->usb_enabled = 0;
 524                 }
 525                 bci->usb_cur = 0;
 526         }
 527
 528         return ret;
 529 }
 530
 531 /*
 532  * Enable/Disable AC Charge funtionality.
 533  */
 534 static int twl4030_charger_enable_ac(struct twl4030_bci *bci, bool enable)
 535 {
 536         int ret;
 537
 538         if (bci->ac_mode == CHARGE_OFF)
 539                 enable = false;
 540
 541         if (enable)
 542                 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOAC);
 543         else
 544                 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC, 0);
 545
 546         return ret;
 547 }
 548
 549 /*
 550  * Enable/Disable charging of Backup Battery.
 551  */
 552 static int twl4030_charger_enable_backup(int uvolt, int uamp)
 553 {
 554         int ret;
 555         u8 flags;
 556
 557         if (uvolt < 2500000 ||
 558             uamp < 25) {
 559                 /* disable charging of backup battery */
 560                 ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER,
 561                                         TWL4030_BBCHEN, 0, TWL4030_BB_CFG);
 562                 return ret;
 563         }
 564
 565         flags = TWL4030_BBCHEN;
 566         if (uvolt >= 3200000)
 567                 flags |= TWL4030_BBSEL_3V2;
 568         else if (uvolt >= 3100000)
 569                 flags |= TWL4030_BBSEL_3V1;
 570         else if (uvolt >= 3000000)
 571                 flags |= TWL4030_BBSEL_3V0;
 572         else
 573                 flags |= TWL4030_BBSEL_2V5;
 574
 575         if (uamp >= 1000)
 576                 flags |= TWL4030_BBISEL_1000uA;
 577         else if (uamp >= 500)
 578                 flags |= TWL4030_BBISEL_500uA;
 579         else if (uamp >= 150)
 580                 flags |= TWL4030_BBISEL_150uA;
 581         else
 582                 flags |= TWL4030_BBISEL_25uA;
 583
 584         ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER,
 585                                 TWL4030_BBSEL_MASK | TWL4030_BBISEL_MASK,
 586                                 flags,
 587                                 TWL4030_BB_CFG);
 588
 589         return ret;
 590 }
 591
 592 /*
 593  * TWL4030 CHG_PRES (AC charger presence) events
 594  */
 595 static irqreturn_t twl4030_charger_interrupt(int irq, void *arg)
 596 {
 597         struct twl4030_bci *bci = arg;
 598
 599         dev_dbg(bci->dev, "CHG_PRES irq\n");
 600         /* reset current on each 'plug' event */
 601         bci->ac_cur = 500000;
 602         twl4030_charger_update_current(bci);
 603         power_supply_changed(bci->ac);
 604         power_supply_changed(bci->usb);
 605
 606         return IRQ_HANDLED;
 607 }
 608
 609 /*
 610  * TWL4030 BCI monitoring events
 611  */
 612 static irqreturn_t twl4030_bci_interrupt(int irq, void *arg)
 613 {
 614         struct twl4030_bci *bci = arg;
 615         u8 irqs1, irqs2;
 616         int ret;
 617
 618         ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs1,
 619                               TWL4030_INTERRUPTS_BCIISR1A);
 620         if (ret < 0)
 621                 return IRQ_HANDLED;
 622
 623         ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs2,
 624                               TWL4030_INTERRUPTS_BCIISR2A);
 625         if (ret < 0)
 626                 return IRQ_HANDLED;
 627
 628         dev_dbg(bci->dev, "BCI irq %02x %02x\n", irqs2, irqs1);
 629
 630         if (irqs1 & (TWL4030_ICHGLOW | TWL4030_ICHGEOC)) {
 631                 /* charger state change, inform the core */
 632                 power_supply_changed(bci->ac);
 633                 power_supply_changed(bci->usb);
 634         }
 635         twl4030_charger_update_current(bci);
 636
 637         /* various monitoring events, for now we just log them here */
 638         if (irqs1 & (TWL4030_TBATOR2 | TWL4030_TBATOR1))
 639                 dev_warn(bci->dev, "battery temperature out of range\n");
 640
 641         if (irqs1 & TWL4030_BATSTS)
 642                 dev_crit(bci->dev, "battery disconnected\n");
 643
 644         if (irqs2 & TWL4030_VBATOV)
 645                 dev_crit(bci->dev, "VBAT overvoltage\n");
 646
 647         if (irqs2 & TWL4030_VBUSOV)
 648                 dev_crit(bci->dev, "VBUS overvoltage\n");
 649
 650         if (irqs2 & TWL4030_ACCHGOV)
 651                 dev_crit(bci->dev, "Ac charger overvoltage\n");
 652
 653         return IRQ_HANDLED;
 654 }
 655
 656 /*
 657  * Provide "max_current" attribute in sysfs.
 658  */
 659 static ssize_t
 660 twl4030_bci_max_current_store(struct device *dev, struct device_attribute *attr,
 661         const char *buf, size_t n)
 662 {
 663         struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
 664         int cur = 0;
 665         int status = 0;
 666         status = kstrtoint(buf, 10, &cur);
 667         if (status)
 668                 return status;
 669         if (cur < 0)
 670                 return -EINVAL;
 671         if (dev == &bci->ac->dev)
 672                 bci->ac_cur = cur;
 673         else
 674                 bci->usb_cur_target = cur;
 675
 676         twl4030_charger_update_current(bci);
 677         return n;
 678 }
 679
 680 /*
 681  * sysfs max_current show
 682  */
 683 static ssize_t twl4030_bci_max_current_show(struct device *dev,
 684         struct device_attribute *attr, char *buf)
 685 {
 686         int status = 0;
 687         int cur = -1;
 688         u8 bcictl1;
 689         struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
 690
 691         if (dev == &bci->ac->dev) {
 692                 if (!bci->ac_is_active)
 693                         cur = bci->ac_cur;
 694         } else {
 695                 if (bci->ac_is_active)
 696                         cur = bci->usb_cur_target;
 697         }
 698         if (cur < 0) {
 699                 cur = twl4030bci_read_adc_val(TWL4030_BCIIREF1);
 700                 if (cur < 0)
 701                         return cur;
 702                 status = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
 703                 if (status < 0)
 704                         return status;
 705                 cur = regval2ua(cur, bcictl1 & TWL4030_CGAIN);
 706         }
 707         return scnprintf(buf, PAGE_SIZE, "%u\n", cur);
 708 }
 709
 710 static DEVICE_ATTR(max_current, 0644, twl4030_bci_max_current_show,
 711                         twl4030_bci_max_current_store);
 712
 713 static void twl4030_bci_usb_work(struct work_struct *data)
 714 {
 715         struct twl4030_bci *bci = container_of(data, struct twl4030_bci, work);
 716
 717         switch (bci->event) {
 718         case USB_EVENT_VBUS:
 719         case USB_EVENT_CHARGER:
 720                 twl4030_charger_enable_usb(bci, true);
 721                 break;
 722         case USB_EVENT_NONE:
 723                 twl4030_charger_enable_usb(bci, false);
 724                 break;
 725         }
 726 }
 727
 728 static int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val,
 729                                void *priv)
 730 {
 731         struct twl4030_bci *bci = container_of(nb, struct twl4030_bci, usb_nb);
 732
 733         dev_dbg(bci->dev, "OTG notify %lu\n", val);
 734
 735         /* reset current on each 'plug' event */
 736         if (allow_usb)
 737                 bci->usb_cur_target = 500000;
 738         else
 739                 bci->usb_cur_target = 100000;
 740
 741         bci->event = val;
 742         schedule_work(&bci->work);
 743
 744         return NOTIFY_OK;
 745 }
 746
 747 /*
 748  * sysfs charger enabled store
 749  */
 750 static ssize_t
 751 twl4030_bci_mode_store(struct device *dev, struct device_attribute *attr,
 752                           const char *buf, size_t n)
 753 {
 754         struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
 755         int mode;
 756         int status;
 757
 758         if (sysfs_streq(buf, modes[0]))
 759                 mode = 0;
 760         else if (sysfs_streq(buf, modes[1]))
 761                 mode = 1;
 762         else if (sysfs_streq(buf, modes[2]))
 763                 mode = 2;
 764         else
 765                 return -EINVAL;
 766         if (dev == &bci->ac->dev) {
 767                 if (mode == 2)
 768                         return -EINVAL;
 769                 twl4030_charger_enable_ac(bci, false);
 770                 bci->ac_mode = mode;
 771                 status = twl4030_charger_enable_ac(bci, true);
 772         } else {
 773                 twl4030_charger_enable_usb(bci, false);
 774                 bci->usb_mode = mode;
 775                 status = twl4030_charger_enable_usb(bci, true);
 776         }
 777         return (status == 0) ? n : status;
 778 }
 779
 780 /*
 781  * sysfs charger enabled show
 782  */
 783 static ssize_t
 784 twl4030_bci_mode_show(struct device *dev,
 785                              struct device_attribute *attr, char *buf)
 786 {
 787         struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
 788         int len = 0;
 789         int i;
 790         int mode = bci->usb_mode;
 791
 792         if (dev == &bci->ac->dev)
 793                 mode = bci->ac_mode;
 794
 795         for (i = 0; i < ARRAY_SIZE(modes); i++)
 796                 if (mode == i)
 797                         len += snprintf(buf+len, PAGE_SIZE-len,
 798                                         "[%s] ", modes[i]);
 799                 else
 800                         len += snprintf(buf+len, PAGE_SIZE-len,
 801                                         "%s ", modes[i]);
 802         buf[len-1] = '\n';
 803         return len;
 804 }
 805 static DEVICE_ATTR(mode, 0644, twl4030_bci_mode_show,
 806                    twl4030_bci_mode_store);
 807
 808 static int twl4030_charger_get_current(void)
 809 {
 810         int curr;
 811         int ret;
 812         u8 bcictl1;
 813
 814         curr = twl4030bci_read_adc_val(TWL4030_BCIICHG);
 815         if (curr < 0)
 816                 return curr;
 817
 818         ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
 819         if (ret)
 820                 return ret;
 821
 822         return regval2ua(curr, bcictl1 & TWL4030_CGAIN);
 823 }
 824
 825 /*
 826  * Returns the main charge FSM state
 827  * Or < 0 on failure.
 828  */
 829 static int twl4030bci_state(struct twl4030_bci *bci)
 830 {
 831         int ret;
 832         u8 state;
 833
 834         ret = twl4030_bci_read(TWL4030_BCIMSTATEC, &state);
 835         if (ret) {
 836                 pr_err("twl4030_bci: error reading BCIMSTATEC\n");
 837                 return ret;
 838         }
 839
 840         dev_dbg(bci->dev, "state: %02x\n", state);
 841
 842         return state;
 843 }
 844
 845 static int twl4030_bci_state_to_status(int state)
 846 {
 847         state &= TWL4030_MSTATEC_MASK;
 848         if (TWL4030_MSTATEC_QUICK1 <= state && state <= TWL4030_MSTATEC_QUICK7)
 849                 return POWER_SUPPLY_STATUS_CHARGING;
 850         else if (TWL4030_MSTATEC_COMPLETE1 <= state &&
 851                                         state <= TWL4030_MSTATEC_COMPLETE4)
 852                 return POWER_SUPPLY_STATUS_FULL;
 853         else
 854                 return POWER_SUPPLY_STATUS_NOT_CHARGING;
 855 }
 856
 857 static int twl4030_bci_get_property(struct power_supply *psy,
 858                                     enum power_supply_property psp,
 859                                     union power_supply_propval *val)
 860 {
 861         struct twl4030_bci *bci = dev_get_drvdata(psy->dev.parent);
 862         int is_charging;
 863         int state;
 864         int ret;
 865
 866         state = twl4030bci_state(bci);
 867         if (state < 0)
 868                 return state;
 869
 870         if (psy->desc->type == POWER_SUPPLY_TYPE_USB)
 871                 is_charging = state & TWL4030_MSTATEC_USB;
 872         else
 873                 is_charging = state & TWL4030_MSTATEC_AC;
 874         if (!is_charging) {
 875                 u8 s;
 876                 twl4030_bci_read(TWL4030_BCIMDEN, &s);
 877                 if (psy->desc->type == POWER_SUPPLY_TYPE_USB)
 878                         is_charging = s & 1;
 879                 else
 880                         is_charging = s & 2;
 881                 if (is_charging)
 882                         /* A little white lie */
 883                         state = TWL4030_MSTATEC_QUICK1;
 884         }
 885
 886         switch (psp) {
 887         case POWER_SUPPLY_PROP_STATUS:
 888                 if (is_charging)
 889                         val->intval = twl4030_bci_state_to_status(state);
 890                 else
 891                         val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
 892                 break;
 893         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 894                 /* charging must be active for meaningful result */
 895                 if (!is_charging)
 896                         return -ENODATA;
 897                 if (psy->desc->type == POWER_SUPPLY_TYPE_USB) {
 898                         ret = twl4030bci_read_adc_val(TWL4030_BCIVBUS);
 899                         if (ret < 0)
 900                                 return ret;
 901                         /* BCIVBUS uses ADCIN8, 7/1023 V/step */
 902                         val->intval = ret * 6843;
 903                 } else {
 904                         ret = twl4030bci_read_adc_val(TWL4030_BCIVAC);
 905                         if (ret < 0)
 906                                 return ret;
 907                         /* BCIVAC uses ADCIN11, 10/1023 V/step */
 908                         val->intval = ret * 9775;
 909                 }
 910                 break;
 911         case POWER_SUPPLY_PROP_CURRENT_NOW:
 912                 if (!is_charging)
 913                         return -ENODATA;
 914                 /* current measurement is shared between AC and USB */
 915                 ret = twl4030_charger_get_current();
 916                 if (ret < 0)
 917                         return ret;
 918                 val->intval = ret;
 919                 break;
 920         case POWER_SUPPLY_PROP_ONLINE:
 921                 val->intval = is_charging &&
 922                         twl4030_bci_state_to_status(state) !=
 923                                 POWER_SUPPLY_STATUS_NOT_CHARGING;
 924                 break;
 925         default:
 926                 return -EINVAL;
 927         }
 928
 929         return 0;
 930 }
 931
 932 static enum power_supply_property twl4030_charger_props[] = {
 933         POWER_SUPPLY_PROP_STATUS,
 934         POWER_SUPPLY_PROP_ONLINE,
 935         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 936         POWER_SUPPLY_PROP_CURRENT_NOW,
 937 };
 938
 939 #ifdef CONFIG_OF
 940 static const struct twl4030_bci_platform_data *
 941 twl4030_bci_parse_dt(struct device *dev)
 942 {
 943         struct device_node *np = dev->of_node;
 944         struct twl4030_bci_platform_data *pdata;
 945         u32 num;
 946
 947         if (!np)
 948                 return NULL;
 949         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 950         if (!pdata)
 951                 return pdata;
 952
 953         if (of_property_read_u32(np, "ti,bb-uvolt", &num) == 0)
 954                 pdata->bb_uvolt = num;
 955         if (of_property_read_u32(np, "ti,bb-uamp", &num) == 0)
 956                 pdata->bb_uamp = num;
 957         return pdata;
 958 }
 959 #else
 960 static inline const struct twl4030_bci_platform_data *
 961 twl4030_bci_parse_dt(struct device *dev)
 962 {
 963         return NULL;
 964 }
 965 #endif
 966
 967 static const struct power_supply_desc twl4030_bci_ac_desc = {
 968         .name           = "twl4030_ac",
 969         .type           = POWER_SUPPLY_TYPE_MAINS,
 970         .properties     = twl4030_charger_props,
 971         .num_properties = ARRAY_SIZE(twl4030_charger_props),
 972         .get_property   = twl4030_bci_get_property,
 973 };
 974
 975 static const struct power_supply_desc twl4030_bci_usb_desc = {
 976         .name           = "twl4030_usb",
 977         .type           = POWER_SUPPLY_TYPE_USB,
 978         .properties     = twl4030_charger_props,
 979         .num_properties = ARRAY_SIZE(twl4030_charger_props),
 980         .get_property   = twl4030_bci_get_property,
 981 };
 982
 983 static int twl4030_bci_probe(struct platform_device *pdev)
 984 {
 985         struct twl4030_bci *bci;
 986         const struct twl4030_bci_platform_data *pdata = pdev->dev.platform_data;
 987         int ret;
 988         u32 reg;
 989
 990         bci = devm_kzalloc(&pdev->dev, sizeof(*bci), GFP_KERNEL);
 991         if (bci == NULL)
 992                 return -ENOMEM;
 993
 994         if (!pdata)
 995                 pdata = twl4030_bci_parse_dt(&pdev->dev);
 996
 997         bci->ichg_eoc = 80100; /* Stop charging when current drops to here */
 998         bci->ichg_lo = 241000; /* Low threshold */
 999         bci->ichg_hi = 500000; /* High threshold */
1000         bci->ac_cur = 500000; /* 500mA */
1001         if (allow_usb)
1002                 bci->usb_cur_target = 500000;  /* 500mA */
1003         else
1004                 bci->usb_cur_target = 100000;  /* 100mA */
1005         bci->usb_mode = CHARGE_AUTO;
1006         bci->ac_mode = CHARGE_AUTO;
1007
1008         bci->dev = &pdev->dev;
1009         bci->irq_chg = platform_get_irq(pdev, 0);
1010         bci->irq_bci = platform_get_irq(pdev, 1);
1011
1012         /* Only proceed further *IF* battery is physically present */
1013         ret = twl4030_is_battery_present(bci);
1014         if  (ret) {
1015                 dev_crit(&pdev->dev, "Battery was not detected:%d\n", ret);
1016                 return ret;
1017         }
1018
1019         platform_set_drvdata(pdev, bci);
1020
1021         bci->ac = devm_power_supply_register(&pdev->dev, &twl4030_bci_ac_desc,
1022                                              NULL);
1023         if (IS_ERR(bci->ac)) {
1024                 ret = PTR_ERR(bci->ac);
1025                 dev_err(&pdev->dev, "failed to register ac: %d\n", ret);
1026                 return ret;
1027         }
1028
1029         bci->usb = devm_power_supply_register(&pdev->dev, &twl4030_bci_usb_desc,
1030                                               NULL);
1031         if (IS_ERR(bci->usb)) {
1032                 ret = PTR_ERR(bci->usb);
1033                 dev_err(&pdev->dev, "failed to register usb: %d\n", ret);
1034                 return ret;
1035         }
1036
1037         ret = devm_request_threaded_irq(&pdev->dev, bci->irq_chg, NULL,
1038                         twl4030_charger_interrupt, IRQF_ONESHOT, pdev->name,
1039                         bci);
1040         if (ret < 0) {
1041                 dev_err(&pdev->dev, "could not request irq %d, status %d\n",
1042                         bci->irq_chg, ret);
1043                 return ret;
1044         }
1045
1046         ret = devm_request_threaded_irq(&pdev->dev, bci->irq_bci, NULL,
1047                         twl4030_bci_interrupt, IRQF_ONESHOT, pdev->name, bci);
1048         if (ret < 0) {
1049                 dev_err(&pdev->dev, "could not request irq %d, status %d\n",
1050                         bci->irq_bci, ret);
1051                 return ret;
1052         }
1053
1054         bci->channel_vac = iio_channel_get(&pdev->dev, "vac");
1055         if (IS_ERR(bci->channel_vac)) {
1056                 bci->channel_vac = NULL;
1057                 dev_warn(&pdev->dev, "could not request vac iio channel");
1058         }
1059
1060         INIT_WORK(&bci->work, twl4030_bci_usb_work);
1061         INIT_DELAYED_WORK(&bci->current_worker, twl4030_current_worker);
1062
1063         bci->usb_nb.notifier_call = twl4030_bci_usb_ncb;
1064         if (bci->dev->of_node) {
1065                 struct device_node *phynode;
1066
1067                 phynode = of_find_compatible_node(bci->dev->of_node->parent,
1068                                                   NULL, "ti,twl4030-usb");
1069                 if (phynode)
1070                         bci->transceiver = devm_usb_get_phy_by_node(
1071                                 bci->dev, phynode, &bci->usb_nb);
1072         }
1073
1074         /* Enable interrupts now. */
1075         reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_ICHGEOC | TWL4030_TBATOR2 |
1076                 TWL4030_TBATOR1 | TWL4030_BATSTS);
1077         ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
1078                                TWL4030_INTERRUPTS_BCIIMR1A);
1079         if (ret < 0) {
1080                 dev_err(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
1081                 goto fail;
1082         }
1083
1084         reg = ~(u32)(TWL4030_VBATOV | TWL4030_VBUSOV | TWL4030_ACCHGOV);
1085         ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
1086                                TWL4030_INTERRUPTS_BCIIMR2A);
1087         if (ret < 0)
1088                 dev_warn(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
1089
1090         twl4030_charger_update_current(bci);
1091         if (device_create_file(&bci->usb->dev, &dev_attr_max_current))
1092                 dev_warn(&pdev->dev, "could not create sysfs file\n");
1093         if (device_create_file(&bci->usb->dev, &dev_attr_mode))
1094                 dev_warn(&pdev->dev, "could not create sysfs file\n");
1095         if (device_create_file(&bci->ac->dev, &dev_attr_mode))
1096                 dev_warn(&pdev->dev, "could not create sysfs file\n");
1097         if (device_create_file(&bci->ac->dev, &dev_attr_max_current))
1098                 dev_warn(&pdev->dev, "could not create sysfs file\n");
1099
1100         twl4030_charger_enable_ac(bci, true);
1101         if (!IS_ERR_OR_NULL(bci->transceiver))
1102                 twl4030_bci_usb_ncb(&bci->usb_nb,
1103                                     bci->transceiver->last_event,
1104                                     NULL);
1105         else
1106                 twl4030_charger_enable_usb(bci, false);
1107         if (pdata)
1108                 twl4030_charger_enable_backup(pdata->bb_uvolt,
1109                                               pdata->bb_uamp);
1110         else
1111                 twl4030_charger_enable_backup(0, 0);
1112
1113         return 0;
1114 fail:
1115         iio_channel_release(bci->channel_vac);
1116
1117         return ret;
1118 }
1119
1120 static int __exit twl4030_bci_remove(struct platform_device *pdev)
1121 {
1122         struct twl4030_bci *bci = platform_get_drvdata(pdev);
1123
1124         twl4030_charger_enable_ac(bci, false);
1125         twl4030_charger_enable_usb(bci, false);
1126         twl4030_charger_enable_backup(0, 0);
1127
1128         iio_channel_release(bci->channel_vac);
1129
1130         device_remove_file(&bci->usb->dev, &dev_attr_max_current);
1131         device_remove_file(&bci->usb->dev, &dev_attr_mode);
1132         device_remove_file(&bci->ac->dev, &dev_attr_max_current);
1133         device_remove_file(&bci->ac->dev, &dev_attr_mode);
1134         /* mask interrupts */
1135         twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
1136                          TWL4030_INTERRUPTS_BCIIMR1A);
1137         twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
1138                          TWL4030_INTERRUPTS_BCIIMR2A);
1139
1140         return 0;
1141 }
1142
1143 static const struct of_device_id twl_bci_of_match[] = {
1144         {.compatible = "ti,twl4030-bci", },
1145         { }
1146 };
1147 MODULE_DEVICE_TABLE(of, twl_bci_of_match);
1148
1149 static struct platform_driver twl4030_bci_driver = {
1150         .probe = twl4030_bci_probe,
1151         .driver = {
1152                 .name   = "twl4030_bci",
1153                 .of_match_table = of_match_ptr(twl_bci_of_match),
1154         },
1155         .remove = __exit_p(twl4030_bci_remove),
1156 };
1157 module_platform_driver(twl4030_bci_driver);
1158
1159 MODULE_AUTHOR("Gražvydas Ignotas");
1160 MODULE_DESCRIPTION("TWL4030 Battery Charger Interface driver");
1161 MODULE_LICENSE("GPL");
1162 MODULE_ALIAS("platform:twl4030_bci");