drivers/power/supply/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  * TI provided formulas:
 210  * CGAIN == 0: ICHG = (BCIICHG * 1.7) / (2^10 - 1) - 0.85
 211  * CGAIN == 1: ICHG = (BCIICHG * 3.4) / (2^10 - 1) - 1.7
 212  * Here we use integer approximation of:
 213  * CGAIN == 0: val * 1.6618 - 0.85 * 1000
 214  * CGAIN == 1: (val * 1.6618 - 0.85 * 1000) * 2
 215  */
 216 /*
 217  * convert twl register value for currents into uA
 218  */
 219 static int regval2ua(int regval, bool cgain)
 220 {
 221         if (cgain)
 222                 return (regval * 16618 - 8500 * 1000) / 5;
 223         else
 224                 return (regval * 16618 - 8500 * 1000) / 10;
 225 }
 226
 227 /*
 228  * convert uA currents into twl register value
 229  */
 230 static int ua2regval(int ua, bool cgain)
 231 {
 232         int ret;
 233         if (cgain)
 234                 ua /= 2;
 235         ret = (ua * 10 + 8500 * 1000) / 16618;
 236         /* rounding problems */
 237         if (ret < 512)
 238                 ret = 512;
 239         return ret;
 240 }
 241
 242 static int twl4030_charger_update_current(struct twl4030_bci *bci)
 243 {
 244         int status;
 245         int cur;
 246         unsigned reg, cur_reg;
 247         u8 bcictl1, oldreg, fullreg;
 248         bool cgain = false;
 249         u8 boot_bci;
 250
 251         /*
 252          * If AC (Accessory Charger) voltage exceeds 4.5V (MADC 11)
 253          * and AC is enabled, set current for 'ac'
 254          */
 255         if (ac_available(bci->channel_vac)) {
 256                 cur = bci->ac_cur;
 257                 bci->ac_is_active = true;
 258         } else {
 259                 cur = bci->usb_cur;
 260                 bci->ac_is_active = false;
 261                 if (cur > bci->usb_cur_target) {
 262                         cur = bci->usb_cur_target;
 263                         bci->usb_cur = cur;
 264                 }
 265                 if (cur < bci->usb_cur_target)
 266                         schedule_delayed_work(&bci->current_worker, USB_CUR_DELAY);
 267         }
 268
 269         /* First, check thresholds and see if cgain is needed */
 270         if (bci->ichg_eoc >= 200000)
 271                 cgain = true;
 272         if (bci->ichg_lo >= 400000)
 273                 cgain = true;
 274         if (bci->ichg_hi >= 820000)
 275                 cgain = true;
 276         if (cur > 852000)
 277                 cgain = true;
 278
 279         status = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
 280         if (status < 0)
 281                 return status;
 282         if (twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &boot_bci,
 283                             TWL4030_PM_MASTER_BOOT_BCI) < 0)
 284                 boot_bci = 0;
 285         boot_bci &= 7;
 286
 287         if ((!!cgain) != !!(bcictl1 & TWL4030_CGAIN))
 288                 /* Need to turn for charging while we change the
 289                  * CGAIN bit.  Leave it off while everything is
 290                  * updated.
 291                  */
 292                 twl4030_clear_set_boot_bci(boot_bci, 0);
 293
 294         /*
 295          * For ichg_eoc, the hardware only supports reg values matching
 296          * 100XXXX000, and requires the XXXX be stored in the high nibble
 297          * of TWL4030_BCIMFTH8.
 298          */
 299         reg = ua2regval(bci->ichg_eoc, cgain);
 300         if (reg > 0x278)
 301                 reg = 0x278;
 302         if (reg < 0x200)
 303                 reg = 0x200;
 304         reg = (reg >> 3) & 0xf;
 305         fullreg = reg << 4;
 306
 307         /*
 308          * For ichg_lo, reg value must match 10XXXX0000.
 309          * XXXX is stored in low nibble of TWL4030_BCIMFTH8.
 310          */
 311         reg = ua2regval(bci->ichg_lo, cgain);
 312         if (reg > 0x2F0)
 313                 reg = 0x2F0;
 314         if (reg < 0x200)
 315                 reg = 0x200;
 316         reg = (reg >> 4) & 0xf;
 317         fullreg |= reg;
 318
 319         /* ichg_eoc and ichg_lo live in same register */
 320         status = twl4030_bci_read(TWL4030_BCIMFTH8, &oldreg);
 321         if (status < 0)
 322                 return status;
 323         if (oldreg != fullreg) {
 324                 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xF4,
 325                                           TWL4030_BCIMFKEY);
 326                 if (status < 0)
 327                         return status;
 328                 twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
 329                                  fullreg, TWL4030_BCIMFTH8);
 330         }
 331
 332         /* ichg_hi threshold must be 1XXXX01100 (I think) */
 333         reg = ua2regval(bci->ichg_hi, cgain);
 334         if (reg > 0x3E0)
 335                 reg = 0x3E0;
 336         if (reg < 0x200)
 337                 reg = 0x200;
 338         fullreg = (reg >> 5) & 0xF;
 339         fullreg <<= 4;
 340         status = twl4030_bci_read(TWL4030_BCIMFTH9, &oldreg);
 341         if (status < 0)
 342                 return status;
 343         if ((oldreg & 0xF0) != fullreg) {
 344                 fullreg |= (oldreg & 0x0F);
 345                 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7,
 346                                           TWL4030_BCIMFKEY);
 347                 if (status < 0)
 348                         return status;
 349                 twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
 350                                  fullreg, TWL4030_BCIMFTH9);
 351         }
 352
 353         /*
 354          * And finally, set the current.  This is stored in
 355          * two registers.
 356          */
 357         reg = ua2regval(cur, cgain);
 358         /* we have only 10 bits */
 359         if (reg > 0x3ff)
 360                 reg = 0x3ff;
 361         status = twl4030_bci_read(TWL4030_BCIIREF1, &oldreg);
 362         if (status < 0)
 363                 return status;
 364         cur_reg = oldreg;
 365         status = twl4030_bci_read(TWL4030_BCIIREF2, &oldreg);
 366         if (status < 0)
 367                 return status;
 368         cur_reg |= oldreg << 8;
 369         if (reg != oldreg) {
 370                 /* disable write protection for one write access for
 371                  * BCIIREF */
 372                 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7,
 373                                           TWL4030_BCIMFKEY);
 374                 if (status < 0)
 375                         return status;
 376                 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
 377                                           (reg & 0x100) ? 3 : 2,
 378                                           TWL4030_BCIIREF2);
 379                 if (status < 0)
 380                         return status;
 381                 /* disable write protection for one write access for
 382                  * BCIIREF */
 383                 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7,
 384                                           TWL4030_BCIMFKEY);
 385                 if (status < 0)
 386                         return status;
 387                 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
 388                                           reg & 0xff,
 389                                           TWL4030_BCIIREF1);
 390         }
 391         if ((!!cgain) != !!(bcictl1 & TWL4030_CGAIN)) {
 392                 /* Flip CGAIN and re-enable charging */
 393                 bcictl1 ^= TWL4030_CGAIN;
 394                 twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
 395                                  bcictl1, TWL4030_BCICTL1);
 396                 twl4030_clear_set_boot_bci(0, boot_bci);
 397         }
 398         return 0;
 399 }
 400
 401 static int twl4030_charger_get_current(void);
 402
 403 static void twl4030_current_worker(struct work_struct *data)
 404 {
 405         int v, curr;
 406         int res;
 407         struct twl4030_bci *bci = container_of(data, struct twl4030_bci,
 408                                                current_worker.work);
 409
 410         res = twl4030bci_read_adc_val(TWL4030_BCIVBUS);
 411         if (res < 0)
 412                 v = 0;
 413         else
 414                 /* BCIVBUS uses ADCIN8, 7/1023 V/step */
 415                 v = res * 6843;
 416         curr = twl4030_charger_get_current();
 417
 418         dev_dbg(bci->dev, "v=%d cur=%d limit=%d target=%d\n", v, curr,
 419                 bci->usb_cur, bci->usb_cur_target);
 420
 421         if (v < USB_MIN_VOLT) {
 422                 /* Back up and stop adjusting. */
 423                 bci->usb_cur -= USB_CUR_STEP;
 424                 bci->usb_cur_target = bci->usb_cur;
 425         } else if (bci->usb_cur >= bci->usb_cur_target ||
 426                    bci->usb_cur + USB_CUR_STEP > USB_MAX_CURRENT) {
 427                 /* Reached target and voltage is OK - stop */
 428                 return;
 429         } else {
 430                 bci->usb_cur += USB_CUR_STEP;
 431                 schedule_delayed_work(&bci->current_worker, USB_CUR_DELAY);
 432         }
 433         twl4030_charger_update_current(bci);
 434 }
 435
 436 /*
 437  * Enable/Disable USB Charge functionality.
 438  */
 439 static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
 440 {
 441         int ret;
 442
 443         if (bci->usb_mode == CHARGE_OFF)
 444                 enable = false;
 445         if (enable && !IS_ERR_OR_NULL(bci->transceiver)) {
 446
 447                 twl4030_charger_update_current(bci);
 448
 449                 /* Need to keep phy powered */
 450                 if (!bci->usb_enabled) {
 451                         pm_runtime_get_sync(bci->transceiver->dev);
 452                         bci->usb_enabled = 1;
 453                 }
 454
 455                 if (bci->usb_mode == CHARGE_AUTO)
 456                         /* forcing the field BCIAUTOUSB (BOOT_BCI[1]) to 1 */
 457                         ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOUSB);
 458
 459                 /* forcing USBFASTMCHG(BCIMFSTS4[2]) to 1 */
 460                 ret = twl4030_clear_set(TWL_MODULE_MAIN_CHARGE, 0,
 461                         TWL4030_USBFASTMCHG, TWL4030_BCIMFSTS4);
 462                 if (bci->usb_mode == CHARGE_LINEAR) {
 463                         twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC|TWL4030_CVENAC, 0);
 464                         /* Watch dog key: WOVF acknowledge */
 465                         ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x33,
 466                                                TWL4030_BCIWDKEY);
 467                         /* 0x24 + EKEY6: off mode */
 468                         ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x2a,
 469                                                TWL4030_BCIMDKEY);
 470                         /* EKEY2: Linear charge: USB path */
 471                         ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x26,
 472                                                TWL4030_BCIMDKEY);
 473                         /* WDKEY5: stop watchdog count */
 474                         ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xf3,
 475                                                TWL4030_BCIWDKEY);
 476                         /* enable MFEN3 access */
 477                         ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x9c,
 478                                                TWL4030_BCIMFKEY);
 479                          /* ICHGEOCEN - end-of-charge monitor (current < 80mA)
 480                           *                      (charging continues)
 481                           * ICHGLOWEN - current level monitor (charge continues)
 482                           * don't monitor over-current or heat save
 483                           */
 484                         ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xf0,
 485                                                TWL4030_BCIMFEN3);
 486                 }
 487         } else {
 488                 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOUSB, 0);
 489                 ret |= twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x2a,
 490                                         TWL4030_BCIMDKEY);
 491                 if (bci->usb_enabled) {
 492                         pm_runtime_mark_last_busy(bci->transceiver->dev);
 493                         pm_runtime_put_autosuspend(bci->transceiver->dev);
 494                         bci->usb_enabled = 0;
 495                 }
 496                 bci->usb_cur = 0;
 497         }
 498
 499         return ret;
 500 }
 501
 502 /*
 503  * Enable/Disable AC Charge funtionality.
 504  */
 505 static int twl4030_charger_enable_ac(struct twl4030_bci *bci, bool enable)
 506 {
 507         int ret;
 508
 509         if (bci->ac_mode == CHARGE_OFF)
 510                 enable = false;
 511
 512         if (enable)
 513                 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOAC);
 514         else
 515                 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC, 0);
 516
 517         return ret;
 518 }
 519
 520 /*
 521  * Enable/Disable charging of Backup Battery.
 522  */
 523 static int twl4030_charger_enable_backup(int uvolt, int uamp)
 524 {
 525         int ret;
 526         u8 flags;
 527
 528         if (uvolt < 2500000 ||
 529             uamp < 25) {
 530                 /* disable charging of backup battery */
 531                 ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER,
 532                                         TWL4030_BBCHEN, 0, TWL4030_BB_CFG);
 533                 return ret;
 534         }
 535
 536         flags = TWL4030_BBCHEN;
 537         if (uvolt >= 3200000)
 538                 flags |= TWL4030_BBSEL_3V2;
 539         else if (uvolt >= 3100000)
 540                 flags |= TWL4030_BBSEL_3V1;
 541         else if (uvolt >= 3000000)
 542                 flags |= TWL4030_BBSEL_3V0;
 543         else
 544                 flags |= TWL4030_BBSEL_2V5;
 545
 546         if (uamp >= 1000)
 547                 flags |= TWL4030_BBISEL_1000uA;
 548         else if (uamp >= 500)
 549                 flags |= TWL4030_BBISEL_500uA;
 550         else if (uamp >= 150)
 551                 flags |= TWL4030_BBISEL_150uA;
 552         else
 553                 flags |= TWL4030_BBISEL_25uA;
 554
 555         ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER,
 556                                 TWL4030_BBSEL_MASK | TWL4030_BBISEL_MASK,
 557                                 flags,
 558                                 TWL4030_BB_CFG);
 559
 560         return ret;
 561 }
 562
 563 /*
 564  * TWL4030 CHG_PRES (AC charger presence) events
 565  */
 566 static irqreturn_t twl4030_charger_interrupt(int irq, void *arg)
 567 {
 568         struct twl4030_bci *bci = arg;
 569
 570         dev_dbg(bci->dev, "CHG_PRES irq\n");
 571         /* reset current on each 'plug' event */
 572         bci->ac_cur = 500000;
 573         twl4030_charger_update_current(bci);
 574         power_supply_changed(bci->ac);
 575         power_supply_changed(bci->usb);
 576
 577         return IRQ_HANDLED;
 578 }
 579
 580 /*
 581  * TWL4030 BCI monitoring events
 582  */
 583 static irqreturn_t twl4030_bci_interrupt(int irq, void *arg)
 584 {
 585         struct twl4030_bci *bci = arg;
 586         u8 irqs1, irqs2;
 587         int ret;
 588
 589         ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs1,
 590                               TWL4030_INTERRUPTS_BCIISR1A);
 591         if (ret < 0)
 592                 return IRQ_HANDLED;
 593
 594         ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs2,
 595                               TWL4030_INTERRUPTS_BCIISR2A);
 596         if (ret < 0)
 597                 return IRQ_HANDLED;
 598
 599         dev_dbg(bci->dev, "BCI irq %02x %02x\n", irqs2, irqs1);
 600
 601         if (irqs1 & (TWL4030_ICHGLOW | TWL4030_ICHGEOC)) {
 602                 /* charger state change, inform the core */
 603                 power_supply_changed(bci->ac);
 604                 power_supply_changed(bci->usb);
 605         }
 606         twl4030_charger_update_current(bci);
 607
 608         /* various monitoring events, for now we just log them here */
 609         if (irqs1 & (TWL4030_TBATOR2 | TWL4030_TBATOR1))
 610                 dev_warn(bci->dev, "battery temperature out of range\n");
 611
 612         if (irqs1 & TWL4030_BATSTS)
 613                 dev_crit(bci->dev, "battery disconnected\n");
 614
 615         if (irqs2 & TWL4030_VBATOV)
 616                 dev_crit(bci->dev, "VBAT overvoltage\n");
 617
 618         if (irqs2 & TWL4030_VBUSOV)
 619                 dev_crit(bci->dev, "VBUS overvoltage\n");
 620
 621         if (irqs2 & TWL4030_ACCHGOV)
 622                 dev_crit(bci->dev, "Ac charger overvoltage\n");
 623
 624         return IRQ_HANDLED;
 625 }
 626
 627 /*
 628  * Provide "max_current" attribute in sysfs.
 629  */
 630 static ssize_t
 631 twl4030_bci_max_current_store(struct device *dev, struct device_attribute *attr,
 632         const char *buf, size_t n)
 633 {
 634         struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
 635         int cur = 0;
 636         int status = 0;
 637         status = kstrtoint(buf, 10, &cur);
 638         if (status)
 639                 return status;
 640         if (cur < 0)
 641                 return -EINVAL;
 642         if (dev == &bci->ac->dev)
 643                 bci->ac_cur = cur;
 644         else
 645                 bci->usb_cur_target = cur;
 646
 647         twl4030_charger_update_current(bci);
 648         return n;
 649 }
 650
 651 /*
 652  * sysfs max_current show
 653  */
 654 static ssize_t twl4030_bci_max_current_show(struct device *dev,
 655         struct device_attribute *attr, char *buf)
 656 {
 657         int status = 0;
 658         int cur = -1;
 659         u8 bcictl1;
 660         struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
 661
 662         if (dev == &bci->ac->dev) {
 663                 if (!bci->ac_is_active)
 664                         cur = bci->ac_cur;
 665         } else {
 666                 if (bci->ac_is_active)
 667                         cur = bci->usb_cur_target;
 668         }
 669         if (cur < 0) {
 670                 cur = twl4030bci_read_adc_val(TWL4030_BCIIREF1);
 671                 if (cur < 0)
 672                         return cur;
 673                 status = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
 674                 if (status < 0)
 675                         return status;
 676                 cur = regval2ua(cur, bcictl1 & TWL4030_CGAIN);
 677         }
 678         return scnprintf(buf, PAGE_SIZE, "%u\n", cur);
 679 }
 680
 681 static DEVICE_ATTR(max_current, 0644, twl4030_bci_max_current_show,
 682                         twl4030_bci_max_current_store);
 683
 684 static void twl4030_bci_usb_work(struct work_struct *data)
 685 {
 686         struct twl4030_bci *bci = container_of(data, struct twl4030_bci, work);
 687
 688         switch (bci->event) {
 689         case USB_EVENT_VBUS:
 690         case USB_EVENT_CHARGER:
 691                 twl4030_charger_enable_usb(bci, true);
 692                 break;
 693         case USB_EVENT_NONE:
 694                 twl4030_charger_enable_usb(bci, false);
 695                 break;
 696         }
 697 }
 698
 699 static int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val,
 700                                void *priv)
 701 {
 702         struct twl4030_bci *bci = container_of(nb, struct twl4030_bci, usb_nb);
 703
 704         dev_dbg(bci->dev, "OTG notify %lu\n", val);
 705
 706         /* reset current on each 'plug' event */
 707         if (allow_usb)
 708                 bci->usb_cur_target = 500000;
 709         else
 710                 bci->usb_cur_target = 100000;
 711
 712         bci->event = val;
 713         schedule_work(&bci->work);
 714
 715         return NOTIFY_OK;
 716 }
 717
 718 /*
 719  * sysfs charger enabled store
 720  */
 721 static ssize_t
 722 twl4030_bci_mode_store(struct device *dev, struct device_attribute *attr,
 723                           const char *buf, size_t n)
 724 {
 725         struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
 726         int mode;
 727         int status;
 728
 729         if (sysfs_streq(buf, modes[0]))
 730                 mode = 0;
 731         else if (sysfs_streq(buf, modes[1]))
 732                 mode = 1;
 733         else if (sysfs_streq(buf, modes[2]))
 734                 mode = 2;
 735         else
 736                 return -EINVAL;
 737         if (dev == &bci->ac->dev) {
 738                 if (mode == 2)
 739                         return -EINVAL;
 740                 twl4030_charger_enable_ac(bci, false);
 741                 bci->ac_mode = mode;
 742                 status = twl4030_charger_enable_ac(bci, true);
 743         } else {
 744                 twl4030_charger_enable_usb(bci, false);
 745                 bci->usb_mode = mode;
 746                 status = twl4030_charger_enable_usb(bci, true);
 747         }
 748         return (status == 0) ? n : status;
 749 }
 750
 751 /*
 752  * sysfs charger enabled show
 753  */
 754 static ssize_t
 755 twl4030_bci_mode_show(struct device *dev,
 756                              struct device_attribute *attr, char *buf)
 757 {
 758         struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
 759         int len = 0;
 760         int i;
 761         int mode = bci->usb_mode;
 762
 763         if (dev == &bci->ac->dev)
 764                 mode = bci->ac_mode;
 765
 766         for (i = 0; i < ARRAY_SIZE(modes); i++)
 767                 if (mode == i)
 768                         len += snprintf(buf+len, PAGE_SIZE-len,
 769                                         "[%s] ", modes[i]);
 770                 else
 771                         len += snprintf(buf+len, PAGE_SIZE-len,
 772                                         "%s ", modes[i]);
 773         buf[len-1] = '\n';
 774         return len;
 775 }
 776 static DEVICE_ATTR(mode, 0644, twl4030_bci_mode_show,
 777                    twl4030_bci_mode_store);
 778
 779 static int twl4030_charger_get_current(void)
 780 {
 781         int curr;
 782         int ret;
 783         u8 bcictl1;
 784
 785         curr = twl4030bci_read_adc_val(TWL4030_BCIICHG);
 786         if (curr < 0)
 787                 return curr;
 788
 789         ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
 790         if (ret)
 791                 return ret;
 792
 793         return regval2ua(curr, bcictl1 & TWL4030_CGAIN);
 794 }
 795
 796 /*
 797  * Returns the main charge FSM state
 798  * Or < 0 on failure.
 799  */
 800 static int twl4030bci_state(struct twl4030_bci *bci)
 801 {
 802         int ret;
 803         u8 state;
 804
 805         ret = twl4030_bci_read(TWL4030_BCIMSTATEC, &state);
 806         if (ret) {
 807                 pr_err("twl4030_bci: error reading BCIMSTATEC\n");
 808                 return ret;
 809         }
 810
 811         dev_dbg(bci->dev, "state: %02x\n", state);
 812
 813         return state;
 814 }
 815
 816 static int twl4030_bci_state_to_status(int state)
 817 {
 818         state &= TWL4030_MSTATEC_MASK;
 819         if (TWL4030_MSTATEC_QUICK1 <= state && state <= TWL4030_MSTATEC_QUICK7)
 820                 return POWER_SUPPLY_STATUS_CHARGING;
 821         else if (TWL4030_MSTATEC_COMPLETE1 <= state &&
 822                                         state <= TWL4030_MSTATEC_COMPLETE4)
 823                 return POWER_SUPPLY_STATUS_FULL;
 824         else
 825                 return POWER_SUPPLY_STATUS_NOT_CHARGING;
 826 }
 827
 828 static int twl4030_bci_get_property(struct power_supply *psy,
 829                                     enum power_supply_property psp,
 830                                     union power_supply_propval *val)
 831 {
 832         struct twl4030_bci *bci = dev_get_drvdata(psy->dev.parent);
 833         int is_charging;
 834         int state;
 835         int ret;
 836
 837         state = twl4030bci_state(bci);
 838         if (state < 0)
 839                 return state;
 840
 841         if (psy->desc->type == POWER_SUPPLY_TYPE_USB)
 842                 is_charging = state & TWL4030_MSTATEC_USB;
 843         else
 844                 is_charging = state & TWL4030_MSTATEC_AC;
 845         if (!is_charging) {
 846                 u8 s;
 847                 twl4030_bci_read(TWL4030_BCIMDEN, &s);
 848                 if (psy->desc->type == POWER_SUPPLY_TYPE_USB)
 849                         is_charging = s & 1;
 850                 else
 851                         is_charging = s & 2;
 852                 if (is_charging)
 853                         /* A little white lie */
 854                         state = TWL4030_MSTATEC_QUICK1;
 855         }
 856
 857         switch (psp) {
 858         case POWER_SUPPLY_PROP_STATUS:
 859                 if (is_charging)
 860                         val->intval = twl4030_bci_state_to_status(state);
 861                 else
 862                         val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
 863                 break;
 864         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 865                 /* charging must be active for meaningful result */
 866                 if (!is_charging)
 867                         return -ENODATA;
 868                 if (psy->desc->type == POWER_SUPPLY_TYPE_USB) {
 869                         ret = twl4030bci_read_adc_val(TWL4030_BCIVBUS);
 870                         if (ret < 0)
 871                                 return ret;
 872                         /* BCIVBUS uses ADCIN8, 7/1023 V/step */
 873                         val->intval = ret * 6843;
 874                 } else {
 875                         ret = twl4030bci_read_adc_val(TWL4030_BCIVAC);
 876                         if (ret < 0)
 877                                 return ret;
 878                         /* BCIVAC uses ADCIN11, 10/1023 V/step */
 879                         val->intval = ret * 9775;
 880                 }
 881                 break;
 882         case POWER_SUPPLY_PROP_CURRENT_NOW:
 883                 if (!is_charging)
 884                         return -ENODATA;
 885                 /* current measurement is shared between AC and USB */
 886                 ret = twl4030_charger_get_current();
 887                 if (ret < 0)
 888                         return ret;
 889                 val->intval = ret;
 890                 break;
 891         case POWER_SUPPLY_PROP_ONLINE:
 892                 val->intval = is_charging &&
 893                         twl4030_bci_state_to_status(state) !=
 894                                 POWER_SUPPLY_STATUS_NOT_CHARGING;
 895                 break;
 896         case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
 897                 val->intval = -1;
 898                 if (psy->desc->type != POWER_SUPPLY_TYPE_USB) {
 899                         if (!bci->ac_is_active)
 900                                 val->intval = bci->ac_cur;
 901                 } else {
 902                         if (bci->ac_is_active)
 903                                 val->intval = bci->usb_cur_target;
 904                 }
 905                 if (val->intval < 0) {
 906                         u8 bcictl1;
 907
 908                         val->intval = twl4030bci_read_adc_val(TWL4030_BCIIREF1);
 909                         if (val->intval < 0)
 910                                 return val->intval;
 911                         ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
 912                         if (ret < 0)
 913                                 return ret;
 914                         val->intval = regval2ua(val->intval, bcictl1 &
 915                                                         TWL4030_CGAIN);
 916                 }
 917                 break;
 918         default:
 919                 return -EINVAL;
 920         }
 921
 922         return 0;
 923 }
 924
 925 static int twl4030_bci_set_property(struct power_supply *psy,
 926                                     enum power_supply_property psp,
 927                                     const union power_supply_propval *val)
 928 {
 929         struct twl4030_bci *bci = dev_get_drvdata(psy->dev.parent);
 930
 931         switch (psp) {
 932         case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
 933                 if (psy->desc->type == POWER_SUPPLY_TYPE_USB)
 934                         bci->usb_cur_target = val->intval;
 935                 else
 936                         bci->ac_cur = val->intval;
 937                 twl4030_charger_update_current(bci);
 938                 break;
 939         default:
 940                 return -EINVAL;
 941         }
 942
 943         return 0;
 944 }
 945
 946 static int twl4030_bci_property_is_writeable(struct power_supply *psy,
 947                                       enum power_supply_property psp)
 948 {
 949         switch (psp) {
 950         case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
 951                 return true;
 952         default:
 953                 return false;
 954         }
 955 }
 956
 957 static enum power_supply_property twl4030_charger_props[] = {
 958         POWER_SUPPLY_PROP_STATUS,
 959         POWER_SUPPLY_PROP_ONLINE,
 960         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 961         POWER_SUPPLY_PROP_CURRENT_NOW,
 962         POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
 963 };
 964
 965 #ifdef CONFIG_OF
 966 static const struct twl4030_bci_platform_data *
 967 twl4030_bci_parse_dt(struct device *dev)
 968 {
 969         struct device_node *np = dev->of_node;
 970         struct twl4030_bci_platform_data *pdata;
 971         u32 num;
 972
 973         if (!np)
 974                 return NULL;
 975         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 976         if (!pdata)
 977                 return pdata;
 978
 979         if (of_property_read_u32(np, "ti,bb-uvolt", &num) == 0)
 980                 pdata->bb_uvolt = num;
 981         if (of_property_read_u32(np, "ti,bb-uamp", &num) == 0)
 982                 pdata->bb_uamp = num;
 983         return pdata;
 984 }
 985 #else
 986 static inline const struct twl4030_bci_platform_data *
 987 twl4030_bci_parse_dt(struct device *dev)
 988 {
 989         return NULL;
 990 }
 991 #endif
 992
 993 static const struct power_supply_desc twl4030_bci_ac_desc = {
 994         .name           = "twl4030_ac",
 995         .type           = POWER_SUPPLY_TYPE_MAINS,
 996         .properties     = twl4030_charger_props,
 997         .num_properties = ARRAY_SIZE(twl4030_charger_props),
 998         .get_property   = twl4030_bci_get_property,
 999         .set_property   = twl4030_bci_set_property,
1000         .property_is_writeable  = twl4030_bci_property_is_writeable,
1001 };
1002
1003 static const struct power_supply_desc twl4030_bci_usb_desc = {
1004         .name           = "twl4030_usb",
1005         .type           = POWER_SUPPLY_TYPE_USB,
1006         .properties     = twl4030_charger_props,
1007         .num_properties = ARRAY_SIZE(twl4030_charger_props),
1008         .get_property   = twl4030_bci_get_property,
1009         .set_property   = twl4030_bci_set_property,
1010         .property_is_writeable  = twl4030_bci_property_is_writeable,
1011 };
1012
1013 static int twl4030_bci_probe(struct platform_device *pdev)
1014 {
1015         struct twl4030_bci *bci;
1016         const struct twl4030_bci_platform_data *pdata = pdev->dev.platform_data;
1017         int ret;
1018         u32 reg;
1019
1020         bci = devm_kzalloc(&pdev->dev, sizeof(*bci), GFP_KERNEL);
1021         if (bci == NULL)
1022                 return -ENOMEM;
1023
1024         if (!pdata)
1025                 pdata = twl4030_bci_parse_dt(&pdev->dev);
1026
1027         bci->ichg_eoc = 80100; /* Stop charging when current drops to here */
1028         bci->ichg_lo = 241000; /* Low threshold */
1029         bci->ichg_hi = 500000; /* High threshold */
1030         bci->ac_cur = 500000; /* 500mA */
1031         if (allow_usb)
1032                 bci->usb_cur_target = 500000;  /* 500mA */
1033         else
1034                 bci->usb_cur_target = 100000;  /* 100mA */
1035         bci->usb_mode = CHARGE_AUTO;
1036         bci->ac_mode = CHARGE_AUTO;
1037
1038         bci->dev = &pdev->dev;
1039         bci->irq_chg = platform_get_irq(pdev, 0);
1040         bci->irq_bci = platform_get_irq(pdev, 1);
1041
1042         platform_set_drvdata(pdev, bci);
1043
1044         bci->ac = devm_power_supply_register(&pdev->dev, &twl4030_bci_ac_desc,
1045                                              NULL);
1046         if (IS_ERR(bci->ac)) {
1047                 ret = PTR_ERR(bci->ac);
1048                 dev_err(&pdev->dev, "failed to register ac: %d\n", ret);
1049                 return ret;
1050         }
1051
1052         bci->usb = devm_power_supply_register(&pdev->dev, &twl4030_bci_usb_desc,
1053                                               NULL);
1054         if (IS_ERR(bci->usb)) {
1055                 ret = PTR_ERR(bci->usb);
1056                 dev_err(&pdev->dev, "failed to register usb: %d\n", ret);
1057                 return ret;
1058         }
1059
1060         ret = devm_request_threaded_irq(&pdev->dev, bci->irq_chg, NULL,
1061                         twl4030_charger_interrupt, IRQF_ONESHOT, pdev->name,
1062                         bci);
1063         if (ret < 0) {
1064                 dev_err(&pdev->dev, "could not request irq %d, status %d\n",
1065                         bci->irq_chg, ret);
1066                 return ret;
1067         }
1068
1069         ret = devm_request_threaded_irq(&pdev->dev, bci->irq_bci, NULL,
1070                         twl4030_bci_interrupt, IRQF_ONESHOT, pdev->name, bci);
1071         if (ret < 0) {
1072                 dev_err(&pdev->dev, "could not request irq %d, status %d\n",
1073                         bci->irq_bci, ret);
1074                 return ret;
1075         }
1076
1077         bci->channel_vac = iio_channel_get(&pdev->dev, "vac");
1078         if (IS_ERR(bci->channel_vac)) {
1079                 bci->channel_vac = NULL;
1080                 dev_warn(&pdev->dev, "could not request vac iio channel");
1081         }
1082
1083         INIT_WORK(&bci->work, twl4030_bci_usb_work);
1084         INIT_DELAYED_WORK(&bci->current_worker, twl4030_current_worker);
1085
1086         bci->usb_nb.notifier_call = twl4030_bci_usb_ncb;
1087         if (bci->dev->of_node) {
1088                 struct device_node *phynode;
1089
1090                 phynode = of_find_compatible_node(bci->dev->of_node->parent,
1091                                                   NULL, "ti,twl4030-usb");
1092                 if (phynode)
1093                         bci->transceiver = devm_usb_get_phy_by_node(
1094                                 bci->dev, phynode, &bci->usb_nb);
1095         }
1096
1097         /* Enable interrupts now. */
1098         reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_ICHGEOC | TWL4030_TBATOR2 |
1099                 TWL4030_TBATOR1 | TWL4030_BATSTS);
1100         ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
1101                                TWL4030_INTERRUPTS_BCIIMR1A);
1102         if (ret < 0) {
1103                 dev_err(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
1104                 goto fail;
1105         }
1106
1107         reg = ~(u32)(TWL4030_VBATOV | TWL4030_VBUSOV | TWL4030_ACCHGOV);
1108         ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
1109                                TWL4030_INTERRUPTS_BCIIMR2A);
1110         if (ret < 0)
1111                 dev_warn(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
1112
1113         twl4030_charger_update_current(bci);
1114         if (device_create_file(&bci->usb->dev, &dev_attr_max_current))
1115                 dev_warn(&pdev->dev, "could not create sysfs file\n");
1116         if (device_create_file(&bci->usb->dev, &dev_attr_mode))
1117                 dev_warn(&pdev->dev, "could not create sysfs file\n");
1118         if (device_create_file(&bci->ac->dev, &dev_attr_mode))
1119                 dev_warn(&pdev->dev, "could not create sysfs file\n");
1120         if (device_create_file(&bci->ac->dev, &dev_attr_max_current))
1121                 dev_warn(&pdev->dev, "could not create sysfs file\n");
1122
1123         twl4030_charger_enable_ac(bci, true);
1124         if (!IS_ERR_OR_NULL(bci->transceiver))
1125                 twl4030_bci_usb_ncb(&bci->usb_nb,
1126                                     bci->transceiver->last_event,
1127                                     NULL);
1128         else
1129                 twl4030_charger_enable_usb(bci, false);
1130         if (pdata)
1131                 twl4030_charger_enable_backup(pdata->bb_uvolt,
1132                                               pdata->bb_uamp);
1133         else
1134                 twl4030_charger_enable_backup(0, 0);
1135
1136         return 0;
1137 fail:
1138         iio_channel_release(bci->channel_vac);
1139
1140         return ret;
1141 }
1142
1143 static int twl4030_bci_remove(struct platform_device *pdev)
1144 {
1145         struct twl4030_bci *bci = platform_get_drvdata(pdev);
1146
1147         twl4030_charger_enable_ac(bci, false);
1148         twl4030_charger_enable_usb(bci, false);
1149         twl4030_charger_enable_backup(0, 0);
1150
1151         iio_channel_release(bci->channel_vac);
1152
1153         device_remove_file(&bci->usb->dev, &dev_attr_max_current);
1154         device_remove_file(&bci->usb->dev, &dev_attr_mode);
1155         device_remove_file(&bci->ac->dev, &dev_attr_max_current);
1156         device_remove_file(&bci->ac->dev, &dev_attr_mode);
1157         /* mask interrupts */
1158         twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
1159                          TWL4030_INTERRUPTS_BCIIMR1A);
1160         twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
1161                          TWL4030_INTERRUPTS_BCIIMR2A);
1162
1163         return 0;
1164 }
1165
1166 static const struct of_device_id twl_bci_of_match[] = {
1167         {.compatible = "ti,twl4030-bci", },
1168         { }
1169 };
1170 MODULE_DEVICE_TABLE(of, twl_bci_of_match);
1171
1172 static struct platform_driver twl4030_bci_driver = {
1173         .probe = twl4030_bci_probe,
1174         .remove = twl4030_bci_remove,
1175         .driver = {
1176                 .name   = "twl4030_bci",
1177                 .of_match_table = of_match_ptr(twl_bci_of_match),
1178         },
1179 };
1180 module_platform_driver(twl4030_bci_driver);
1181
1182 MODULE_AUTHOR("Gražvydas Ignotas");
1183 MODULE_DESCRIPTION("TWL4030 Battery Charger Interface driver");
1184 MODULE_LICENSE("GPL");
1185 MODULE_ALIAS("platform:twl4030_bci");