drivers/power/twl4030_charger.c

   1 /*
   2  * TWL4030/TPS65950 BCI (Battery Charger Interface) driver
   3  *
   4  * Copyright (C) 2010 Gražvydas Ignotas <notasas@gmail.com>
   5  *
   6  * based on twl4030_bci_battery.c by TI
   7  * Copyright (C) 2008 Texas Instruments, Inc.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  */
  14
  15 #include <linux/init.h>
  16 #include <linux/module.h>
  17 #include <linux/slab.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/i2c/twl.h>
  21 #include <linux/power_supply.h>
  22 #include <linux/notifier.h>
  23 #include <linux/usb/otg.h>
  24 #include <linux/ratelimit.h>
  25 #include <linux/regulator/machine.h>
  26 #include <linux/leds.h>
  27
  28 #define TWL4030_BCIMSTATEC      0x02
  29 #define TWL4030_BCIICHG         0x08
  30 #define TWL4030_BCIVAC          0x0a
  31 #define TWL4030_BCIVBUS         0x0c
  32 #define TWL4030_BCIMFSTS3       0x0f
  33 #define TWL4030_BCIMFSTS4       0x10
  34 #define TWL4030_BCIMFKEY        0x11
  35 #define TWL4030_BCIMFTH8        0x1d
  36 #define TWL4030_BCICTL1         0x23
  37 #define TWL4030_BCIIREF1        0x27
  38 #define TWL4030_BCIIREF2        0x28
  39
  40 #define TWL4030_BCIAUTOWEN      BIT(5)
  41 #define TWL4030_CONFIG_DONE     BIT(4)
  42 #define TWL4030_CVENAC          BIT(2)
  43 #define TWL4030_BCIAUTOUSB      BIT(1)
  44 #define TWL4030_BCIAUTOAC       BIT(0)
  45 #define TWL4030_CGAIN           BIT(5)
  46 #define TWL4030_USBFASTMCHG     BIT(2)
  47 #define TWL4030_STS_VBUS        BIT(7)
  48 #define TWL4030_STS_USB_ID      BIT(2)
  49 #define TWL4030_STS_CHG         BIT(1)
  50
  51 /* BCI interrupts */
  52 #define TWL4030_WOVF            BIT(0) /* Watchdog overflow */
  53 #define TWL4030_TMOVF           BIT(1) /* Timer overflow */
  54 #define TWL4030_ICHGHIGH        BIT(2) /* Battery charge current high */
  55 #define TWL4030_ICHGLOW         BIT(3) /* Battery cc. low / FSM state change */
  56 #define TWL4030_ICHGEOC         BIT(4) /* Battery current end-of-charge */
  57 #define TWL4030_TBATOR2         BIT(5) /* Battery temperature out of range 2 */
  58 #define TWL4030_TBATOR1         BIT(6) /* Battery temperature out of range 1 */
  59 #define TWL4030_BATSTS          BIT(7) /* Battery status */
  60
  61 #define TWL4030_VBATLVL         BIT(0) /* VBAT level */
  62 #define TWL4030_VBATOV          BIT(1) /* VBAT overvoltage */
  63 #define TWL4030_VBUSOV          BIT(2) /* VBUS overvoltage */
  64 #define TWL4030_ACCHGOV         BIT(3) /* Ac charger overvoltage */
  65
  66 #define TWL4030_MSTATEC_USB             BIT(4)
  67 #define TWL4030_MSTATEC_AC              BIT(5)
  68 #define TWL4030_MSTATEC_MASK            0x0f
  69 #define TWL4030_MSTATEC_QUICK1          0x02
  70 #define TWL4030_MSTATEC_QUICK7          0x07
  71 #define TWL4030_MSTATEC_COMPLETE1       0x0b
  72 #define TWL4030_MSTATEC_COMPLETE4       0x0e
  73
  74 #define TWL4030_KEY_IIREF               0xe7
  75 #define TWL4030_KEY_MFTH8               0xf4
  76 #define TWL4030_BATSTSMCHG              BIT(6)
  77
  78 #define IRQ_CHECK_PERIOD        (3 * HZ)
  79 #define IRQ_CHECK_THRESHOLD     4
  80
  81 /* By default, 80mA */
  82 static unsigned end_of_charge_current = 200000;
  83 module_param(end_of_charge_current, uint, 0);
  84 MODULE_PARM_DESC(end_of_charge_current,
  85         "Stop charging when the charger current goes below this threshold");
  86
  87 static bool allow_usb = 1;
  88 module_param(allow_usb, bool, 0644);
  89 MODULE_PARM_DESC(allow_usb, "Allow USB charge drawing default current");
  90
  91 struct twl4030_bci {
  92         struct device           *dev;
  93         struct power_supply     ac;
  94         struct power_supply     usb;
  95         struct otg_transceiver  *transceiver;
  96         struct notifier_block   otg_nb;
  97         struct work_struct      work;
  98         int                     irq_chg;
  99         int                     irq_bci;
 100         bool                    ac_charge_enable;
 101         bool                    usb_charge_enable;
 102         int                     usb_current;
 103         int                     ac_current;
 104         enum power_supply_type  current_supply;
 105         struct regulator        *usb_reg;
 106         int                     usb_enabled;
 107         int                     irq_had_charger;
 108
 109         unsigned                charge_current;
 110         unsigned                eoc_current;
 111
 112         unsigned long           irq_check_count_time;
 113         int                     irq_check_count;
 114         int                     irq_check_ac_disabled;
 115
 116         struct led_trigger      *charging_any_trig;
 117         int                     was_charging_any;
 118
 119         unsigned long           event;
 120         struct ratelimit_state  ratelimit;
 121 };
 122
 123 /*
 124  * clear and set bits on an given register on a given module
 125  */
 126 static int twl4030_clear_set(u8 mod_no, u8 clear, u8 set, u8 reg)
 127 {
 128         u8 val = 0;
 129         int ret;
 130
 131         ret = twl_i2c_read_u8(mod_no, &val, reg);
 132         if (ret)
 133                 return ret;
 134
 135         val &= ~clear;
 136         val |= set;
 137
 138         return twl_i2c_write_u8(mod_no, val, reg);
 139 }
 140
 141 static int twl4030_bci_read(u8 reg, u8 *val)
 142 {
 143         return twl_i2c_read_u8(TWL4030_MODULE_MAIN_CHARGE, val, reg);
 144 }
 145
 146 static int twl4030_bci_write(u8 reg, u8 val)
 147 {
 148         return twl_i2c_write_u8(TWL4030_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(TWL4030_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 static int twl4030bci_get_cgain(struct twl4030_bci *bci, int *cgain) {
 179         int ret;
 180         u8 reg;
 181
 182         ret = twl4030_bci_read(TWL4030_BCICTL1, &reg);
 183         if (ret < 0) {
 184                 dev_warn(bci->dev, "error fetching CGAIN value from BCICTL1 register");
 185                 return ret;
 186         }
 187         *cgain = (reg & TWL4030_CGAIN) ? 1 : 0;
 188
 189         return 0;
 190 }
 191
 192 /*
 193  * Check if VBUS power is present
 194  */
 195 static int twl4030_bci_have_vbus(struct twl4030_bci *bci)
 196 {
 197         int ret;
 198         u8 hwsts;
 199
 200         ret = twl_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &hwsts,
 201                               TWL4030_PM_MASTER_STS_HW_CONDITIONS);
 202         if (ret < 0)
 203                 return 0;
 204
 205         dev_dbg(bci->dev, "check_vbus: HW_CONDITIONS %02x\n", hwsts);
 206
 207         /* in case we also have STS_USB_ID, VBUS is driven by TWL itself */
 208         if ((hwsts & TWL4030_STS_VBUS) && !(hwsts & TWL4030_STS_USB_ID))
 209                 return 1;
 210
 211         return 0;
 212 }
 213
 214 /*
 215  * Enable/Disable USB Charge functionality.
 216  */
 217 static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
 218 {
 219         int ret;
 220
 221         if (enable) {
 222                 if (!bci->usb_charge_enable)
 223                         return -EACCES;
 224
 225                 /* Check for USB charger conneted */
 226                 if (!twl4030_bci_have_vbus(bci))
 227                         return -ENODEV;
 228
 229                 /*
 230                  * Until we can find out what current the device can provide,
 231                  * require a module param to enable USB charging.
 232                  */
 233                 if (!allow_usb) {
 234                         dev_warn(bci->dev, "USB charging is disabled.\n");
 235                         return -EACCES;
 236                 }
 237
 238                 /* Need to keep regulator on */
 239                 if (!bci->usb_enabled &&
 240                     bci->usb_reg &&
 241                     regulator_enable(bci->usb_reg) == 0)
 242                         bci->usb_enabled = 1;
 243
 244                 /* forcing the field BCIAUTOUSB (BOOT_BCI[1]) to 1 */
 245                 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOUSB);
 246                 if (ret < 0)
 247                         return ret;
 248
 249                 /* forcing USBFASTMCHG(BCIMFSTS4[2]) to 1 */
 250                 ret = twl4030_clear_set(TWL4030_MODULE_MAIN_CHARGE, 0,
 251                         TWL4030_USBFASTMCHG, TWL4030_BCIMFSTS4);
 252         } else {
 253                 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOUSB, 0);
 254                 if (bci->usb_enabled &&
 255                     regulator_disable(bci->usb_reg) == 0)
 256                         bci->usb_enabled = 0;
 257         }
 258
 259         return ret;
 260 }
 261
 262 /*
 263  * Enable/Disable AC Charge funtionality.
 264  */
 265 static int twl4030_charger_enable_ac(bool enable)
 266 {
 267         int ret;
 268
 269         if (enable)
 270                 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOAC);
 271         else
 272                 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC, 0);
 273
 274         return ret;
 275 }
 276
 277 static int update_charge_parameters(struct twl4030_bci *bci,
 278                                         int charge_current, int eoc_current)
 279 {
 280         int old_charge_current = bci->charge_current;
 281         int old_eoc_current = bci->eoc_current;
 282         int ret = 0;
 283         int ret2;
 284         u16 hw_charge_current;
 285         u8 hw_eoc_current, boot_bci_prev, reg, cgain_set, cgain_clear;
 286         bool need_cgain = false;
 287         bool restore_boot_reg = false;
 288
 289         if (charge_current < 0 && eoc_current < 0)
 290                 return -EINVAL;
 291
 292         ret = twl4030_bci_read(TWL4030_BCIMFSTS3, &reg);
 293         if (ret)
 294                 goto fail_norestore;
 295         if (!(reg & TWL4030_BATSTSMCHG)) {
 296                 dev_err(bci->dev, "missing battery, can't change charging parameters\n");
 297                 goto fail_norestore;
 298         }
 299
 300         if (charge_current >= 0)
 301                 bci->charge_current = charge_current;
 302         if (eoc_current >= 0)
 303                 bci->eoc_current = eoc_current;
 304
 305         hw_eoc_current = bci->eoc_current / 13310;
 306         if (hw_eoc_current > 15)
 307                 need_cgain = true;
 308
 309         hw_charge_current = (bci->charge_current * 1000) / 1666666;
 310         if (hw_charge_current > 511)
 311                 need_cgain = true;
 312
 313         if (need_cgain) {
 314                 hw_eoc_current /= 2;
 315                 hw_charge_current /= 2;
 316         }
 317
 318         if (hw_eoc_current > 15) {
 319                 ret = -EINVAL;
 320                 goto fail;
 321         }
 322         if (hw_charge_current > 511) {
 323                 ret = -EINVAL;
 324                 goto fail;
 325         }
 326
 327         ret = twl_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &boot_bci_prev,
 328                 TWL4030_PM_MASTER_BOOT_BCI);
 329         if (ret)
 330                 goto fail;
 331
 332         /*
 333          * Stop automatic charging here, because charge current change
 334          * requires multiple register writes and CGAIN change requires
 335          * automatic charge to be stopped (and CV mode disabled too).
 336          */
 337         ret = twl4030_clear_set_boot_bci(
 338                 TWL4030_CVENAC | TWL4030_BCIAUTOAC | TWL4030_BCIAUTOUSB, 0);
 339         if (ret)
 340                 goto fail;
 341         else
 342                 restore_boot_reg = true;
 343
 344         ret = twl4030_bci_write(TWL4030_BCIMFKEY, TWL4030_KEY_MFTH8);
 345         if (ret)
 346                 goto fail;
 347         ret = twl4030_clear_set(TWL4030_MODULE_MAIN_CHARGE, 0xf0,
 348                         hw_eoc_current << 4, TWL4030_BCIMFTH8);
 349         if (ret)
 350                 goto fail;
 351
 352         ret = twl4030_bci_write(TWL4030_BCIMFKEY, TWL4030_KEY_IIREF);
 353         if (ret)
 354                 goto fail;
 355         ret = twl4030_bci_write(TWL4030_BCIIREF1, hw_charge_current & 0xff);
 356         if (ret)
 357                 goto fail;
 358         ret = twl4030_bci_write(TWL4030_BCIMFKEY, TWL4030_KEY_IIREF);
 359         if (ret)
 360                 goto fail;
 361         ret = twl4030_bci_write(TWL4030_BCIIREF2, (hw_charge_current >> 8) & 0x1);
 362         if (ret)
 363                 goto fail;
 364
 365         if (need_cgain) {
 366                 cgain_set = TWL4030_CGAIN;
 367                 cgain_clear = 0;
 368         } else {
 369                 cgain_set = 0;
 370                 cgain_clear = TWL4030_CGAIN;
 371         }
 372
 373         ret = twl4030_clear_set(TWL4030_MODULE_MAIN_CHARGE,
 374                         cgain_clear, cgain_set, TWL4030_BCICTL1);
 375         if (ret)
 376                 goto fail;
 377
 378         ret = twl4030_bci_read(TWL4030_BCICTL1, &reg);
 379         if (ret != 0 || (reg & TWL4030_CGAIN) != cgain_set) {
 380                 dev_err(bci->dev, "CGAIN change failed\n");
 381                 goto fail;
 382         }
 383
 384 fail:
 385         if (restore_boot_reg && (ret2 = twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER,
 386                         boot_bci_prev, TWL4030_PM_MASTER_BOOT_BCI))) {
 387                 dev_err(bci->dev, "failed boot_bci restore: %d\n", ret2);
 388                 if (!ret)
 389                         ret = ret2;
 390         }
 391
 392         if (ret) {
 393                 if (charge_current >= 0)
 394                         bci->charge_current = old_charge_current;
 395                 if (eoc_current >= 0)
 396                         bci->eoc_current = old_eoc_current;
 397         }
 398
 399 fail_norestore:
 400         if (ret)
 401                 dev_err(bci->dev, "failed to change charging parameters\n");
 402
 403         return ret;
 404 }
 405
 406 /*
 407  * TWL4030 CHG_PRES (AC charger presence) events
 408  */
 409 static irqreturn_t twl4030_charger_interrupt(int irq, void *arg)
 410 {
 411         struct twl4030_bci *bci = arg;
 412         int have_charger;
 413         u8 hw_cond;
 414         int ret;
 415
 416         ret = twl_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &hw_cond,
 417                               TWL4030_PM_MASTER_STS_HW_CONDITIONS);
 418         if (ret < 0) {
 419                 dev_err(bci->dev, "HW_CONDITIONS read failed: %d\n", ret);
 420                 goto out;
 421         }
 422
 423         have_charger = (hw_cond & TWL4030_STS_CHG) ? 1 : 0;
 424         if (have_charger == bci->irq_had_charger)
 425                 goto out;
 426         bci->irq_had_charger = have_charger;
 427
 428         dev_dbg(bci->dev, "CHG_PRES irq, hw_cond %02x\n", hw_cond);
 429
 430         /*
 431          * deal with rare mysterious issue of CHG_PRES changing states at ~4Hz
 432          * without any charger connected or anything
 433          */
 434         if (time_before(jiffies, bci->irq_check_count_time + IRQ_CHECK_PERIOD)) {
 435                 bci->irq_check_count++;
 436                 if (have_charger && bci->irq_check_count > IRQ_CHECK_THRESHOLD) {
 437                         dev_err(bci->dev, "spurious CHG_PRES irqs detected (%d), disabling charger\n",
 438                                 bci->irq_check_count);
 439                         twl4030_charger_enable_ac(false);
 440                         bci->irq_check_ac_disabled = true;
 441                 }
 442         } else {
 443                 bci->irq_check_count_time = jiffies;
 444                 bci->irq_check_count = 1;
 445                 if (have_charger && bci->irq_check_ac_disabled) {
 446                         twl4030_charger_enable_ac(true);
 447                         bci->irq_check_ac_disabled = false;
 448                 }
 449         }
 450
 451         power_supply_changed(&bci->ac);
 452         power_supply_changed(&bci->usb);
 453
 454 out:
 455         return IRQ_HANDLED;
 456 }
 457
 458 /*
 459  * TWL4030 BCI monitoring events
 460  */
 461 static irqreturn_t twl4030_bci_interrupt(int irq, void *arg)
 462 {
 463         struct twl4030_bci *bci = arg;
 464         u8 irqs1, irqs2;
 465         int ret;
 466
 467         ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs1,
 468                               TWL4030_INTERRUPTS_BCIISR1A);
 469         if (ret < 0)
 470                 return IRQ_HANDLED;
 471
 472         ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs2,
 473                               TWL4030_INTERRUPTS_BCIISR2A);
 474         if (ret < 0)
 475                 return IRQ_HANDLED;
 476
 477         dev_dbg(bci->dev, "BCI irq %02x %02x\n", irqs2, irqs1);
 478
 479         if (irqs1 & (TWL4030_ICHGLOW | TWL4030_ICHGEOC)) {
 480                 /* charger state change, inform the core */
 481                 power_supply_changed(&bci->ac);
 482                 power_supply_changed(&bci->usb);
 483         }
 484
 485         /* various monitoring events, for now we just log them here */
 486         if (irqs1 & (TWL4030_TBATOR2 | TWL4030_TBATOR1) &&
 487                         __ratelimit(&bci->ratelimit))
 488                 dev_warn(bci->dev, "battery temperature out of range\n");
 489
 490         if (irqs1 & TWL4030_BATSTS && __ratelimit(&bci->ratelimit))
 491                 dev_crit(bci->dev, "battery disconnected\n");
 492
 493         if (irqs2 & TWL4030_VBATOV && __ratelimit(&bci->ratelimit))
 494                 dev_crit(bci->dev, "VBAT overvoltage\n");
 495
 496         if (irqs2 & TWL4030_VBUSOV && __ratelimit(&bci->ratelimit))
 497                 dev_crit(bci->dev, "VBUS overvoltage\n");
 498
 499         if (irqs2 & TWL4030_ACCHGOV && __ratelimit(&bci->ratelimit))
 500                 dev_crit(bci->dev, "Ac charger overvoltage\n");
 501
 502 #if 0
 503         /* ack the interrupts */
 504         twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, irqs1,
 505                          TWL4030_INTERRUPTS_BCIISR1A);
 506         twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, irqs2,
 507                          TWL4030_INTERRUPTS_BCIISR2A);
 508 #endif
 509
 510         return IRQ_HANDLED;
 511 }
 512
 513 static void twl4030_bci_usb_work(struct work_struct *data)
 514 {
 515         struct twl4030_bci *bci = container_of(data, struct twl4030_bci, work);
 516
 517         switch (bci->event) {
 518         case USB_EVENT_VBUS:
 519         case USB_EVENT_CHARGER:
 520                 twl4030_charger_enable_usb(bci, true);
 521                 break;
 522         case USB_EVENT_NONE:
 523                 twl4030_charger_enable_usb(bci, false);
 524                 break;
 525         }
 526 }
 527
 528 static int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val,
 529                                void *priv)
 530 {
 531         struct twl4030_bci *bci = container_of(nb, struct twl4030_bci, otg_nb);
 532
 533         dev_dbg(bci->dev, "OTG notify %lu\n", val);
 534
 535         bci->event = val;
 536         schedule_work(&bci->work);
 537
 538         return NOTIFY_OK;
 539 }
 540
 541 /*
 542  * TI provided formulas:
 543  * CGAIN == 0: ICHG = (BCIICHG * 1.7) / (2^10 - 1) - 0.85
 544  * CGAIN == 1: ICHG = (BCIICHG * 3.4) / (2^10 - 1) - 1.7
 545  * Here we use integer approximation of:
 546  * CGAIN == 0: val * 1.6618 - 0.85
 547  * CGAIN == 1: (val * 1.6618 - 0.85) * 2
 548  */
 549 static int twl4030_charger_get_current(struct twl4030_bci *bci)
 550 {
 551         int curr;
 552         int ret;
 553         int cgain;
 554
 555         curr = twl4030bci_read_adc_val(TWL4030_BCIICHG);
 556         if (curr < 0)
 557                 return curr;
 558
 559         if ((ret = twl4030bci_get_cgain(bci, &cgain)))
 560                 return ret;
 561
 562         ret = (curr * 16618 - 850 * 10000) / 10;
 563         if (cgain)
 564                 ret *= 2;
 565
 566         return ret;
 567 }
 568
 569 static int twl4030bci_get_charging_current(struct twl4030_bci *bci, int *curr)
 570 {
 571         int ret, val, cgain;
 572
 573         val = twl4030bci_read_adc_val(TWL4030_BCIIREF1);
 574         if (val < 0)
 575                 return val;
 576         if ((ret = twl4030bci_get_cgain(bci, &cgain)))
 577                 return ret;
 578
 579         val &= 0x1ff;
 580         val *= 1666;
 581         if (cgain)
 582                 val *= 2;
 583
 584         *curr = val;
 585
 586         return 0;
 587 }
 588
 589 static int twl4030bci_get_eoc_current(struct twl4030_bci *bci, int *curr)
 590 {
 591         int ret, cgain, ichgeocth;
 592         u8 reg;
 593
 594         if ((ret = twl4030bci_get_cgain(bci, &cgain)))
 595                 return ret;
 596
 597         ret = twl4030_bci_read(TWL4030_BCIMFTH8, &reg);
 598         if (ret < 0) {
 599                 dev_warn(bci->dev, "error fetching BCIMFTH8 register");
 600                 return ret;
 601         }
 602         ichgeocth = reg >> 4;
 603
 604         *curr = (ichgeocth * 13310) * ((cgain) ? 2 : 1);
 605
 606         return 0;
 607 }
 608
 609 static ssize_t twl4030_bci_ac_show_enable(struct device *dev,
 610                                           struct device_attribute *attr,
 611                                           char *buf)
 612 {
 613         u8 boot_bci;
 614         int ret;
 615
 616         ret = twl_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &boot_bci,
 617                               TWL4030_PM_MASTER_BOOT_BCI);
 618         if (ret)
 619                 return ret;
 620
 621         return sprintf(buf, "%d\n", (boot_bci & TWL4030_BCIAUTOAC) ? 1 : 0);
 622 }
 623
 624 static ssize_t twl4030_bci_ac_store_enable(struct device *dev,
 625                                            struct device_attribute *attr,
 626                                            const char *buf, size_t count)
 627 {
 628         struct power_supply *psy = dev_get_drvdata(dev);
 629         struct twl4030_bci *bci = container_of(psy, struct twl4030_bci, ac);
 630         unsigned long enable;
 631         int ret;
 632
 633         ret = strict_strtoul(buf, 10, &enable);
 634         if (ret || enable > 1)
 635                 return -EINVAL;
 636
 637         bci->ac_charge_enable = enable;
 638         twl4030_charger_enable_ac(enable);
 639
 640         return count;
 641 }
 642 static struct device_attribute dev_attr_enable_ac =
 643         __ATTR(enable, S_IRUGO | S_IWUSR, twl4030_bci_ac_show_enable,
 644         twl4030_bci_ac_store_enable);
 645
 646 static ssize_t twl4030_bci_usb_show_enable(struct device *dev,
 647                                            struct device_attribute *attr,
 648                                            char *buf)
 649 {
 650         u8 boot_bci;
 651         int ret;
 652
 653         ret = twl_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &boot_bci,
 654                               TWL4030_PM_MASTER_BOOT_BCI);
 655         if (ret)
 656                 return ret;
 657
 658         return sprintf(buf, "%d\n", (boot_bci & TWL4030_BCIAUTOUSB) ? 1 : 0);
 659 }
 660
 661 static ssize_t twl4030_bci_usb_store_enable(struct device *dev,
 662                                             struct device_attribute *attr,
 663                                             const char *buf, size_t count)
 664 {
 665         struct power_supply *psy = dev_get_drvdata(dev);
 666         struct twl4030_bci *bci = container_of(psy, struct twl4030_bci, usb);
 667         unsigned long enable;
 668         int ret;
 669
 670         ret = strict_strtoul(buf, 10, &enable);
 671         if (ret || enable > 1)
 672                 return -EINVAL;
 673
 674         bci->usb_charge_enable = enable;
 675         twl4030_charger_enable_usb(bci, enable);
 676
 677         return count;
 678 }
 679 static struct device_attribute dev_attr_enable_usb =
 680         __ATTR(enable, S_IRUGO | S_IWUSR, twl4030_bci_usb_show_enable,
 681         twl4030_bci_usb_store_enable);
 682
 683 static ssize_t show_charge_current(struct device *dev,
 684                         struct device_attribute *attr, char *buf)
 685 {
 686         struct power_supply *psy = dev_get_drvdata(dev);
 687         struct twl4030_bci *bci = dev_get_drvdata(psy->dev->parent);
 688         int ret, val;
 689
 690         if ((ret = twl4030bci_get_charging_current(bci, &val)))
 691                 return ret;
 692
 693         return sprintf(buf, "%d\n", val);
 694 }
 695
 696 static ssize_t store_charge_current(struct device *dev,
 697                         struct device_attribute *attr, const char *buf,
 698                         size_t count)
 699 {
 700         struct power_supply *psy = dev_get_drvdata(dev);
 701         struct twl4030_bci *bci = dev_get_drvdata(psy->dev->parent);
 702         unsigned long new_current;
 703         int ret;
 704
 705         ret = strict_strtoul(buf, 10, &new_current);
 706         if (ret)
 707                 return -EINVAL;
 708
 709         /*
 710          * Previously, this sysfs parameter used a different raw-register
 711          * format. All legal values in this format fall numerically into the
 712          * range [0, 1023]. Since in the new format, these encode values so
 713          * low as to be meaningless, reject them here so that anybody trying
 714          * to use the old format will have at least a chance of figuring out
 715          * why it isn't working any more. Note that in both formats, the value
 716          * 0 has the same meaning, so it is allowed where values in the range
 717          * [1, 1023] are not.
 718          */
 719         if (new_current < 1024 && new_current != 0)
 720                 return -EINVAL;
 721
 722         ret = update_charge_parameters(bci, new_current, -1);
 723         if (ret)
 724                 return ret;
 725
 726         if (psy->type == POWER_SUPPLY_TYPE_MAINS)
 727                 bci->ac_current = new_current;
 728         else
 729                 bci->usb_current = new_current;
 730
 731         return count;
 732 }
 733 static DEVICE_ATTR(charge_current, S_IRUGO | S_IWUSR, show_charge_current,
 734         store_charge_current);
 735
 736 static ssize_t show_end_of_charge_current(struct device *dev,
 737                         struct device_attribute *attr, char *buf)
 738 {
 739         struct power_supply *psy = dev_get_drvdata(dev);
 740         struct twl4030_bci *bci = dev_get_drvdata(psy->dev->parent);
 741         int ret, eoc_current;
 742
 743         if ((ret = twl4030bci_get_eoc_current(bci, &eoc_current)))
 744                 return ret;
 745
 746         return sprintf(buf, "%d\n", eoc_current);
 747 }
 748
 749 static ssize_t store_end_of_charge_current(struct device *dev,
 750                         struct device_attribute *attr, const char *buf,
 751                         size_t count)
 752 {
 753         struct power_supply *psy = dev_get_drvdata(dev);
 754         struct twl4030_bci *bci = dev_get_drvdata(psy->dev->parent);
 755         unsigned long new_eoc_current;
 756         int eoc_current, ret;
 757
 758         ret = strict_strtoul(buf, 10, &new_eoc_current);
 759         if (ret)
 760                 return -EINVAL;
 761
 762         eoc_current = new_eoc_current;
 763         /* check for overflow */
 764         if (eoc_current != new_eoc_current)
 765                 return -EINVAL;
 766
 767         if ((ret = update_charge_parameters(bci, -1, eoc_current)))
 768                 return ret;
 769
 770         return count;
 771 }
 772
 773 static DEVICE_ATTR(end_of_charge_current, S_IRUGO | S_IWUSR,
 774         show_end_of_charge_current, store_end_of_charge_current);
 775
 776 static struct attribute *bci_ac_attrs[] = {
 777         &dev_attr_enable_ac.attr,
 778         &dev_attr_charge_current.attr,
 779         &dev_attr_end_of_charge_current.attr,
 780         NULL,
 781 };
 782
 783 static struct attribute *bci_usb_attrs[] = {
 784         &dev_attr_enable_usb.attr,
 785         &dev_attr_charge_current.attr,
 786         &dev_attr_end_of_charge_current.attr,
 787         NULL,
 788 };
 789
 790 static const struct attribute_group bci_ac_attr_group = {
 791         .attrs = bci_ac_attrs,
 792 };
 793
 794 static const struct attribute_group bci_usb_attr_group = {
 795         .attrs = bci_usb_attrs,
 796 };
 797
 798 /*
 799  * Returns the main charge FSM state
 800  * Or < 0 on failure.
 801  */
 802 static int twl4030bci_state(struct twl4030_bci *bci)
 803 {
 804         int ret;
 805         u8 state;
 806
 807         ret = twl4030_bci_read(TWL4030_BCIMSTATEC, &state);
 808         if (ret) {
 809                 pr_err("twl4030_bci: error reading BCIMSTATEC\n");
 810                 return ret;
 811         }
 812
 813         dev_dbg(bci->dev, "state: %02x\n", state);
 814
 815         return state;
 816 }
 817
 818 static int twl4030_bci_state_to_status(int state)
 819 {
 820         state &= TWL4030_MSTATEC_MASK;
 821         if (TWL4030_MSTATEC_QUICK1 <= state && state <= TWL4030_MSTATEC_QUICK7)
 822                 return POWER_SUPPLY_STATUS_CHARGING;
 823         else if (TWL4030_MSTATEC_COMPLETE1 <= state &&
 824                                         state <= TWL4030_MSTATEC_COMPLETE4)
 825                 return POWER_SUPPLY_STATUS_FULL;
 826         else
 827                 return POWER_SUPPLY_STATUS_NOT_CHARGING;
 828 }
 829
 830 static int twl4030_bci_get_property(struct power_supply *psy,
 831                                     enum power_supply_property psp,
 832                                     union power_supply_propval *val)
 833 {
 834         struct twl4030_bci *bci = dev_get_drvdata(psy->dev->parent);
 835         int is_charging_any = 0;
 836         int is_charging = 0;
 837         int state;
 838         int ret;
 839
 840         state = twl4030bci_state(bci);
 841         if (state < 0)
 842                 return state;
 843
 844         if (twl4030_bci_state_to_status(state) ==
 845             POWER_SUPPLY_STATUS_CHARGING) {
 846                 is_charging_any =
 847                         state & (TWL4030_MSTATEC_USB | TWL4030_MSTATEC_AC);
 848                 if (psy->type == POWER_SUPPLY_TYPE_USB)
 849                         is_charging = state & TWL4030_MSTATEC_USB;
 850                 else
 851                         is_charging = state & TWL4030_MSTATEC_AC;
 852         }
 853
 854         if (is_charging_any != bci->was_charging_any) {
 855                 led_trigger_event(bci->charging_any_trig,
 856                         is_charging_any ? LED_FULL : LED_OFF);
 857                 bci->was_charging_any = is_charging_any;
 858         }
 859
 860         if (is_charging && psy->type != bci->current_supply) {
 861                 if (psy->type == POWER_SUPPLY_TYPE_USB)
 862                         update_charge_parameters(bci, bci->usb_current, -1);
 863                 else
 864                         update_charge_parameters(bci, bci->ac_current, -1);
 865                 bci->current_supply = psy->type;
 866         }
 867
 868         switch (psp) {
 869         case POWER_SUPPLY_PROP_STATUS:
 870                 if (is_charging)
 871                         val->intval = twl4030_bci_state_to_status(state);
 872                 else
 873                         val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
 874                 break;
 875         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 876                 /* charging must be active for meaningful result */
 877                 if (!is_charging)
 878                         return -ENODATA;
 879                 if (psy->type == POWER_SUPPLY_TYPE_USB) {
 880                         ret = twl4030bci_read_adc_val(TWL4030_BCIVBUS);
 881                         if (ret < 0)
 882                                 return ret;
 883                         /* BCIVBUS uses ADCIN8, 7/1023 V/step */
 884                         val->intval = ret * 6843;
 885                 } else {
 886                         ret = twl4030bci_read_adc_val(TWL4030_BCIVAC);
 887                         if (ret < 0)
 888                                 return ret;
 889                         /* BCIVAC uses ADCIN11, 10/1023 V/step */
 890                         val->intval = ret * 9775;
 891                 }
 892                 break;
 893         case POWER_SUPPLY_PROP_CURRENT_NOW:
 894                 if (!is_charging)
 895                         return -ENODATA;
 896                 /* current measurement is shared between AC and USB */
 897                 ret = twl4030_charger_get_current(bci);
 898                 if (ret < 0)
 899                         return ret;
 900                 val->intval = ret;
 901                 break;
 902         case POWER_SUPPLY_PROP_ONLINE:
 903                 val->intval = is_charging &&
 904                         twl4030_bci_state_to_status(state) !=
 905                                 POWER_SUPPLY_STATUS_NOT_CHARGING;
 906                 break;
 907         default:
 908                 return -EINVAL;
 909         }
 910
 911         return 0;
 912 }
 913
 914 static enum power_supply_property twl4030_charger_props[] = {
 915         POWER_SUPPLY_PROP_STATUS,
 916         POWER_SUPPLY_PROP_ONLINE,
 917         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 918         POWER_SUPPLY_PROP_CURRENT_NOW,
 919 };
 920
 921 static int __init twl4030_bci_probe(struct platform_device *pdev)
 922 {
 923         const struct twl4030_bci_platform_data *pdata = pdev->dev.platform_data;
 924         struct twl4030_bci *bci;
 925         int ret;
 926         u32 reg;
 927
 928         if (pdata == NULL) {
 929                 dev_err(&pdev->dev, "No platform data\n");
 930                 return -EINVAL;
 931         }
 932
 933         bci = kzalloc(sizeof(*bci), GFP_KERNEL);
 934         if (bci == NULL)
 935                 return -ENOMEM;
 936
 937         bci->dev = &pdev->dev;
 938         bci->irq_chg = platform_get_irq(pdev, 0);
 939         bci->irq_bci = platform_get_irq(pdev, 1);
 940         bci->ac_current = 1200000; /* ~1.2A */
 941         bci->usb_current = 530000; /* ~530mA */
 942
 943         /*
 944          * Make sure to set sane charging settings
 945          *
 946          * charge_current:
 947          * ~500mA (doesn't really get used, overridden by ac_current or
 948          * usb_current as soon as a charger is plugged in).
 949          *
 950          * end_of_charge_current:
 951          * taken from the module parameter.
 952          */
 953         if ((ret = update_charge_parameters(bci,
 954                         500000, end_of_charge_current)))
 955                 goto fail_set_charge_params;
 956
 957         bci->irq_had_charger = -1;
 958         bci->irq_check_count_time = jiffies;
 959
 960         platform_set_drvdata(pdev, bci);
 961
 962         ratelimit_state_init(&bci->ratelimit, HZ, 2);
 963
 964         led_trigger_register_simple("twl4030_bci-charging",
 965                 &bci->charging_any_trig);
 966
 967         bci->ac.name = "twl4030_ac";
 968         bci->ac.type = POWER_SUPPLY_TYPE_MAINS;
 969         bci->ac.properties = twl4030_charger_props;
 970         bci->ac.num_properties = ARRAY_SIZE(twl4030_charger_props);
 971         bci->ac.get_property = twl4030_bci_get_property;
 972         bci->ac.supplied_to = pdata->supplied_to;
 973         bci->ac.num_supplicants = pdata->num_supplicants;
 974
 975         ret = power_supply_register(&pdev->dev, &bci->ac);
 976         if (ret) {
 977                 dev_err(&pdev->dev, "failed to register ac: %d\n", ret);
 978                 goto fail_register_ac;
 979         }
 980
 981         bci->usb.name = "twl4030_usb";
 982         bci->usb.type = POWER_SUPPLY_TYPE_USB;
 983         bci->usb.properties = twl4030_charger_props;
 984         bci->usb.num_properties = ARRAY_SIZE(twl4030_charger_props);
 985         bci->usb.get_property = twl4030_bci_get_property;
 986         bci->usb.supplied_to = pdata->supplied_to;
 987         bci->usb.num_supplicants = pdata->num_supplicants;
 988
 989         bci->usb_reg = regulator_get(bci->dev, "bci3v1");
 990         if (IS_ERR(bci->usb_reg)) {
 991                 dev_warn(&pdev->dev, "regulator get bci3v1 failed\n");
 992                 bci->usb_reg = NULL;
 993         }
 994
 995         ret = power_supply_register(&pdev->dev, &bci->usb);
 996         if (ret) {
 997                 dev_err(&pdev->dev, "failed to register usb: %d\n", ret);
 998                 goto fail_register_usb;
 999         }
1000
1001         ret = request_threaded_irq(bci->irq_chg, NULL,
1002                         twl4030_charger_interrupt, 0, pdev->name, bci);
1003         if (ret < 0) {
1004                 dev_err(&pdev->dev, "could not request irq %d, status %d\n",
1005                         bci->irq_chg, ret);
1006                 goto fail_chg_irq;
1007         }
1008
1009         ret = request_threaded_irq(bci->irq_bci, NULL,
1010                         twl4030_bci_interrupt, 0, pdev->name, bci);
1011         if (ret < 0) {
1012                 dev_err(&pdev->dev, "could not request irq %d, status %d\n",
1013                         bci->irq_bci, ret);
1014                 goto fail_bci_irq;
1015         }
1016
1017         INIT_WORK(&bci->work, twl4030_bci_usb_work);
1018
1019         bci->transceiver = otg_get_transceiver();
1020         if (bci->transceiver != NULL) {
1021                 bci->otg_nb.notifier_call = twl4030_bci_usb_ncb;
1022                 otg_register_notifier(bci->transceiver, &bci->otg_nb);
1023         }
1024
1025         ret = sysfs_create_group(&bci->ac.dev->kobj, &bci_ac_attr_group);
1026         if (ret) {
1027                 dev_err(&pdev->dev, "failed to create sysfs group: %d\n", ret);
1028                 goto fail_sysfs1;
1029         }
1030
1031         ret = sysfs_create_group(&bci->usb.dev->kobj, &bci_usb_attr_group);
1032         if (ret) {
1033                 dev_err(&pdev->dev, "failed to create sysfs group: %d\n", ret);
1034                 goto fail_sysfs2;
1035         }
1036
1037         /* Enable interrupts now. */
1038         reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_ICHGEOC | TWL4030_TBATOR2 |
1039                 TWL4030_TBATOR1 | TWL4030_BATSTS);
1040         ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
1041                                TWL4030_INTERRUPTS_BCIIMR1A);
1042         if (ret < 0) {
1043                 dev_err(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
1044                 goto fail_unmask_interrupts;
1045         }
1046
1047         reg = ~(u32)(TWL4030_VBATOV | TWL4030_VBUSOV | TWL4030_ACCHGOV);
1048         ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
1049                                TWL4030_INTERRUPTS_BCIIMR2A);
1050         if (ret < 0)
1051                 dev_warn(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
1052
1053         bci->ac_charge_enable = true;
1054         bci->usb_charge_enable = true;
1055         twl4030_charger_enable_ac(true);
1056         twl4030_charger_enable_usb(bci, true);
1057
1058         return 0;
1059
1060 fail_unmask_interrupts:
1061         sysfs_remove_group(&bci->usb.dev->kobj, &bci_usb_attr_group);
1062 fail_sysfs2:
1063         sysfs_remove_group(&bci->ac.dev->kobj, &bci_ac_attr_group);
1064 fail_sysfs1:
1065         if (bci->transceiver != NULL) {
1066                 otg_unregister_notifier(bci->transceiver, &bci->otg_nb);
1067                 otg_put_transceiver(bci->transceiver);
1068         }
1069         free_irq(bci->irq_bci, bci);
1070 fail_bci_irq:
1071         free_irq(bci->irq_chg, bci);
1072 fail_chg_irq:
1073         power_supply_unregister(&bci->usb);
1074 fail_register_usb:
1075         power_supply_unregister(&bci->ac);
1076
1077         if (bci->usb_reg) {
1078                 if (bci->usb_enabled)
1079                         regulator_disable(bci->usb_reg);
1080                 regulator_put(bci->usb_reg);
1081         }
1082
1083 fail_register_ac:
1084         led_trigger_unregister_simple(bci->charging_any_trig);
1085         platform_set_drvdata(pdev, NULL);
1086
1087 fail_set_charge_params:
1088         kfree(bci);
1089
1090         return ret;
1091 }
1092
1093 static int __exit twl4030_bci_remove(struct platform_device *pdev)
1094 {
1095         struct twl4030_bci *bci = platform_get_drvdata(pdev);
1096
1097         sysfs_remove_group(&bci->usb.dev->kobj, &bci_usb_attr_group);
1098         sysfs_remove_group(&bci->ac.dev->kobj, &bci_ac_attr_group);
1099
1100         twl4030_charger_enable_ac(false);
1101         twl4030_charger_enable_usb(bci, false);
1102
1103         /* mask interrupts */
1104         twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
1105                          TWL4030_INTERRUPTS_BCIIMR1A);
1106         twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
1107                          TWL4030_INTERRUPTS_BCIIMR2A);
1108
1109         if (bci->transceiver != NULL) {
1110                 otg_unregister_notifier(bci->transceiver, &bci->otg_nb);
1111                 otg_put_transceiver(bci->transceiver);
1112         }
1113         free_irq(bci->irq_bci, bci);
1114         free_irq(bci->irq_chg, bci);
1115         power_supply_unregister(&bci->usb);
1116         power_supply_unregister(&bci->ac);
1117
1118         if (bci->usb_reg) {
1119                 if (bci->usb_enabled)
1120                         regulator_disable(bci->usb_reg);
1121                 regulator_put(bci->usb_reg);
1122         }
1123
1124         led_trigger_unregister_simple(bci->charging_any_trig);
1125         platform_set_drvdata(pdev, NULL);
1126         kfree(bci);
1127
1128         return 0;
1129 }
1130
1131 static struct platform_driver twl4030_bci_driver = {
1132         .driver = {
1133                 .name   = "twl4030_bci",
1134                 .owner  = THIS_MODULE,
1135         },
1136         .remove = __exit_p(twl4030_bci_remove),
1137 };
1138
1139 static int __init twl4030_bci_init(void)
1140 {
1141         return platform_driver_probe(&twl4030_bci_driver, twl4030_bci_probe);
1142 }
1143 module_init(twl4030_bci_init);
1144
1145 static void __exit twl4030_bci_exit(void)
1146 {
1147         platform_driver_unregister(&twl4030_bci_driver);
1148 }
1149 module_exit(twl4030_bci_exit);
1150
1151 MODULE_AUTHOR("Gražvydas Ignotas");
1152 MODULE_DESCRIPTION("TWL4030 Battery Charger Interface driver");
1153 MODULE_LICENSE("GPL");
1154 MODULE_ALIAS("platform:twl4030_bci");