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
  27 #define TWL4030_BCIMSTATEC      0x02
  28 #define TWL4030_BCIICHG         0x08
  29 #define TWL4030_BCIVAC          0x0a
  30 #define TWL4030_BCIVBUS         0x0c
  31 #define TWL4030_BCIMFSTS3       0x0f
  32 #define TWL4030_BCIMFSTS4       0x10
  33 #define TWL4030_BCIMFKEY        0x11
  34 #define TWL4030_BCICTL1         0x23
  35 #define TWL4030_BCIIREF1        0x27
  36 #define TWL4030_BCIIREF2        0x28
  37
  38 #define TWL4030_BCIAUTOWEN      BIT(5)
  39 #define TWL4030_CONFIG_DONE     BIT(4)
  40 #define TWL4030_CVENAC          BIT(2)
  41 #define TWL4030_BCIAUTOUSB      BIT(1)
  42 #define TWL4030_BCIAUTOAC       BIT(0)
  43 #define TWL4030_CGAIN           BIT(5)
  44 #define TWL4030_USBFASTMCHG     BIT(2)
  45 #define TWL4030_STS_VBUS        BIT(7)
  46 #define TWL4030_STS_USB_ID      BIT(2)
  47 #define TWL4030_STS_CHG         BIT(1)
  48
  49 /* BCI interrupts */
  50 #define TWL4030_WOVF            BIT(0) /* Watchdog overflow */
  51 #define TWL4030_TMOVF           BIT(1) /* Timer overflow */
  52 #define TWL4030_ICHGHIGH        BIT(2) /* Battery charge current high */
  53 #define TWL4030_ICHGLOW         BIT(3) /* Battery cc. low / FSM state change */
  54 #define TWL4030_ICHGEOC         BIT(4) /* Battery current end-of-charge */
  55 #define TWL4030_TBATOR2         BIT(5) /* Battery temperature out of range 2 */
  56 #define TWL4030_TBATOR1         BIT(6) /* Battery temperature out of range 1 */
  57 #define TWL4030_BATSTS          BIT(7) /* Battery status */
  58
  59 #define TWL4030_VBATLVL         BIT(0) /* VBAT level */
  60 #define TWL4030_VBATOV          BIT(1) /* VBAT overvoltage */
  61 #define TWL4030_VBUSOV          BIT(2) /* VBUS overvoltage */
  62 #define TWL4030_ACCHGOV         BIT(3) /* Ac charger overvoltage */
  63
  64 #define TWL4030_MSTATEC_USB             BIT(4)
  65 #define TWL4030_MSTATEC_AC              BIT(5)
  66 #define TWL4030_MSTATEC_MASK            0x0f
  67 #define TWL4030_MSTATEC_QUICK1          0x02
  68 #define TWL4030_MSTATEC_QUICK7          0x07
  69 #define TWL4030_MSTATEC_COMPLETE1       0x0b
  70 #define TWL4030_MSTATEC_COMPLETE4       0x0e
  71
  72 #define TWL4030_KEY_IIREF               0xe7
  73 #define TWL4030_BATSTSMCHG              BIT(6)
  74
  75 #define IRQ_CHECK_PERIOD        (3 * HZ)
  76 #define IRQ_CHECK_THRESHOLD     4
  77
  78 static bool allow_usb = 1;
  79 module_param(allow_usb, bool, 0644);
  80 MODULE_PARM_DESC(allow_usb, "Allow USB charge drawing default current");
  81
  82 struct twl4030_bci {
  83         struct device           *dev;
  84         struct power_supply     ac;
  85         struct power_supply     usb;
  86         struct otg_transceiver  *transceiver;
  87         struct notifier_block   otg_nb;
  88         struct work_struct      work;
  89         int                     irq_chg;
  90         int                     irq_bci;
  91         bool                    ac_charge_enable;
  92         bool                    usb_charge_enable;
  93         int                     usb_current;
  94         int                     ac_current;
  95         enum power_supply_type  current_supply;
  96         struct regulator        *usb_reg;
  97         int                     usb_enabled;
  98         int                     irq_had_charger;
  99
 100         unsigned long           irq_check_count_time;
 101         int                     irq_check_count;
 102         int                     irq_check_ac_disabled;
 103
 104         unsigned long           event;
 105         struct ratelimit_state  ratelimit;
 106 };
 107
 108 /*
 109  * clear and set bits on an given register on a given module
 110  */
 111 static int twl4030_clear_set(u8 mod_no, u8 clear, u8 set, u8 reg)
 112 {
 113         u8 val = 0;
 114         int ret;
 115
 116         ret = twl_i2c_read_u8(mod_no, &val, reg);
 117         if (ret)
 118                 return ret;
 119
 120         val &= ~clear;
 121         val |= set;
 122
 123         return twl_i2c_write_u8(mod_no, val, reg);
 124 }
 125
 126 static int twl4030_bci_read(u8 reg, u8 *val)
 127 {
 128         return twl_i2c_read_u8(TWL4030_MODULE_MAIN_CHARGE, val, reg);
 129 }
 130
 131 static int twl4030_bci_write(u8 reg, u8 val)
 132 {
 133         return twl_i2c_write_u8(TWL4030_MODULE_MAIN_CHARGE, val, reg);
 134 }
 135
 136 static int twl4030_clear_set_boot_bci(u8 clear, u8 set)
 137 {
 138         return twl4030_clear_set(TWL4030_MODULE_PM_MASTER, clear,
 139                         TWL4030_CONFIG_DONE | TWL4030_BCIAUTOWEN | set,
 140                         TWL4030_PM_MASTER_BOOT_BCI);
 141 }
 142
 143 static int twl4030bci_read_adc_val(u8 reg)
 144 {
 145         int ret, temp;
 146         u8 val;
 147
 148         /* read MSB */
 149         ret = twl4030_bci_read(reg + 1, &val);
 150         if (ret)
 151                 return ret;
 152
 153         temp = (int)(val & 0x03) << 8;
 154
 155         /* read LSB */
 156         ret = twl4030_bci_read(reg, &val);
 157         if (ret)
 158                 return ret;
 159
 160         return temp | val;
 161 }
 162
 163 /*
 164  * Check if VBUS power is present
 165  */
 166 static int twl4030_bci_have_vbus(struct twl4030_bci *bci)
 167 {
 168         int ret;
 169         u8 hwsts;
 170
 171         ret = twl_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &hwsts,
 172                               TWL4030_PM_MASTER_STS_HW_CONDITIONS);
 173         if (ret < 0)
 174                 return 0;
 175
 176         dev_dbg(bci->dev, "check_vbus: HW_CONDITIONS %02x\n", hwsts);
 177
 178         /* in case we also have STS_USB_ID, VBUS is driven by TWL itself */
 179         if ((hwsts & TWL4030_STS_VBUS) && !(hwsts & TWL4030_STS_USB_ID))
 180                 return 1;
 181
 182         return 0;
 183 }
 184
 185 /*
 186  * Enable/Disable USB Charge functionality.
 187  */
 188 static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
 189 {
 190         int ret;
 191
 192         if (enable) {
 193                 if (!bci->usb_charge_enable)
 194                         return -EACCES;
 195
 196                 /* Check for USB charger conneted */
 197                 if (!twl4030_bci_have_vbus(bci))
 198                         return -ENODEV;
 199
 200                 /*
 201                  * Until we can find out what current the device can provide,
 202                  * require a module param to enable USB charging.
 203                  */
 204                 if (!allow_usb) {
 205                         dev_warn(bci->dev, "USB charging is disabled.\n");
 206                         return -EACCES;
 207                 }
 208
 209                 /* Need to keep regulator on */
 210                 if (!bci->usb_enabled &&
 211                     bci->usb_reg &&
 212                     regulator_enable(bci->usb_reg) == 0)
 213                         bci->usb_enabled = 1;
 214
 215                 /* forcing the field BCIAUTOUSB (BOOT_BCI[1]) to 1 */
 216                 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOUSB);
 217                 if (ret < 0)
 218                         return ret;
 219
 220                 /* forcing USBFASTMCHG(BCIMFSTS4[2]) to 1 */
 221                 ret = twl4030_clear_set(TWL4030_MODULE_MAIN_CHARGE, 0,
 222                         TWL4030_USBFASTMCHG, TWL4030_BCIMFSTS4);
 223         } else {
 224                 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOUSB, 0);
 225                 if (bci->usb_enabled &&
 226                     regulator_disable(bci->usb_reg) == 0)
 227                         bci->usb_enabled = 0;
 228         }
 229
 230         return ret;
 231 }
 232
 233 /*
 234  * Enable/Disable AC Charge funtionality.
 235  */
 236 static int twl4030_charger_enable_ac(bool enable)
 237 {
 238         int ret;
 239
 240         if (enable)
 241                 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOAC);
 242         else
 243                 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC, 0);
 244
 245         return ret;
 246 }
 247
 248 static int set_charge_current(struct twl4030_bci *bci, int new_current)
 249 {
 250         u8 val, boot_bci_prev, cgain_set, cgain_clear;
 251         int ret, ret2;
 252
 253         ret = twl4030_bci_read(TWL4030_BCIMFSTS3, &val);
 254         if (ret)
 255                 goto out_norestore;
 256
 257         if (!(val & TWL4030_BATSTSMCHG)) {
 258                 dev_err(bci->dev, "missing battery, can't change charge_current\n");
 259                 goto out_norestore;
 260         }
 261
 262         ret = twl_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &boot_bci_prev,
 263                 TWL4030_PM_MASTER_BOOT_BCI);
 264         if (ret)
 265                 goto out_norestore;
 266
 267         /*
 268          * Stop automatic charging here, because charge current change
 269          * requires multiple register writes and CGAIN change requires
 270          * automatic charge to be stopped (and CV mode disabled too).
 271          */
 272         ret = twl4030_clear_set_boot_bci(
 273                 TWL4030_CVENAC | TWL4030_BCIAUTOAC | TWL4030_BCIAUTOUSB, 0);
 274         if (ret)
 275                 goto out;
 276
 277         ret = twl4030_bci_write(TWL4030_BCIMFKEY, TWL4030_KEY_IIREF);
 278         if (ret)
 279                 goto out;
 280
 281         ret = twl4030_bci_write(TWL4030_BCIIREF1, new_current & 0xff);
 282         if (ret)
 283                 goto out;
 284
 285         ret = twl4030_bci_write(TWL4030_BCIMFKEY, TWL4030_KEY_IIREF);
 286         if (ret)
 287                 goto out;
 288
 289         ret = twl4030_bci_write(TWL4030_BCIIREF2, (new_current >> 8) & 0x1);
 290         if (ret)
 291                 goto out;
 292
 293         /* Set CGAIN = 0 or 1 */
 294         if (new_current > 511) {
 295                 cgain_set = TWL4030_CGAIN;
 296                 cgain_clear = 0;
 297         } else {
 298                 cgain_set = 0;
 299                 cgain_clear = TWL4030_CGAIN;
 300         }
 301
 302         ret = twl4030_clear_set(TWL4030_MODULE_MAIN_CHARGE,
 303                         cgain_clear, cgain_set, TWL4030_BCICTL1);
 304         if (ret)
 305                 goto out;
 306
 307         ret = twl4030_bci_read(TWL4030_BCICTL1, &val);
 308         if (ret != 0 || (val & TWL4030_CGAIN) != cgain_set) {
 309                 dev_err(bci->dev, "CGAIN change failed\n");
 310                 goto out;
 311         }
 312
 313 out:
 314         ret2 = twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER, boot_bci_prev,
 315                 TWL4030_PM_MASTER_BOOT_BCI);
 316         if (ret2 != 0)
 317                 dev_err(bci->dev, "failed boot_bci restore: %d\n", ret2);
 318
 319 out_norestore:
 320         if (ret != 0)
 321                 dev_err(bci->dev, "charge current change failed: %d\n", ret);
 322
 323         return ret;
 324 }
 325
 326 /*
 327  * TWL4030 CHG_PRES (AC charger presence) events
 328  */
 329 static irqreturn_t twl4030_charger_interrupt(int irq, void *arg)
 330 {
 331         struct twl4030_bci *bci = arg;
 332         int have_charger;
 333         u8 hw_cond;
 334         int ret;
 335
 336         ret = twl_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &hw_cond,
 337                               TWL4030_PM_MASTER_STS_HW_CONDITIONS);
 338         if (ret < 0) {
 339                 dev_err(bci->dev, "HW_CONDITIONS read failed: %d\n", ret);
 340                 goto out;
 341         }
 342
 343         have_charger = (hw_cond & TWL4030_STS_CHG) ? 1 : 0;
 344         if (have_charger == bci->irq_had_charger)
 345                 goto out;
 346         bci->irq_had_charger = have_charger;
 347
 348         dev_dbg(bci->dev, "CHG_PRES irq, hw_cond %02x\n", hw_cond);
 349
 350         /*
 351          * deal with rare mysterious issue of CHG_PRES changing states at ~4Hz
 352          * without any charger connected or anything
 353          */
 354         if (time_before(jiffies, bci->irq_check_count_time + IRQ_CHECK_PERIOD)) {
 355                 bci->irq_check_count++;
 356                 if (have_charger && bci->irq_check_count > IRQ_CHECK_THRESHOLD) {
 357                         dev_err(bci->dev, "spurious CHG_PRES irqs detected (%d), disabling charger\n",
 358                                 bci->irq_check_count);
 359                         twl4030_charger_enable_ac(false);
 360                         bci->irq_check_ac_disabled = true;
 361                 }
 362         } else {
 363                 bci->irq_check_count_time = jiffies;
 364                 bci->irq_check_count = 1;
 365                 if (have_charger && bci->irq_check_ac_disabled) {
 366                         twl4030_charger_enable_ac(true);
 367                         bci->irq_check_ac_disabled = false;
 368                 }
 369         }
 370
 371         power_supply_changed(&bci->ac);
 372         power_supply_changed(&bci->usb);
 373
 374 out:
 375         return IRQ_HANDLED;
 376 }
 377
 378 /*
 379  * TWL4030 BCI monitoring events
 380  */
 381 static irqreturn_t twl4030_bci_interrupt(int irq, void *arg)
 382 {
 383         struct twl4030_bci *bci = arg;
 384         u8 irqs1, irqs2;
 385         int ret;
 386
 387         ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs1,
 388                               TWL4030_INTERRUPTS_BCIISR1A);
 389         if (ret < 0)
 390                 return IRQ_HANDLED;
 391
 392         ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs2,
 393                               TWL4030_INTERRUPTS_BCIISR2A);
 394         if (ret < 0)
 395                 return IRQ_HANDLED;
 396
 397         dev_dbg(bci->dev, "BCI irq %02x %02x\n", irqs2, irqs1);
 398
 399         if (irqs1 & (TWL4030_ICHGLOW | TWL4030_ICHGEOC)) {
 400                 /* charger state change, inform the core */
 401                 power_supply_changed(&bci->ac);
 402                 power_supply_changed(&bci->usb);
 403         }
 404
 405         /* various monitoring events, for now we just log them here */
 406         if (irqs1 & (TWL4030_TBATOR2 | TWL4030_TBATOR1) &&
 407                         __ratelimit(&bci->ratelimit))
 408                 dev_warn(bci->dev, "battery temperature out of range\n");
 409
 410         if (irqs1 & TWL4030_BATSTS && __ratelimit(&bci->ratelimit))
 411                 dev_crit(bci->dev, "battery disconnected\n");
 412
 413         if (irqs2 & TWL4030_VBATOV && __ratelimit(&bci->ratelimit))
 414                 dev_crit(bci->dev, "VBAT overvoltage\n");
 415
 416         if (irqs2 & TWL4030_VBUSOV && __ratelimit(&bci->ratelimit))
 417                 dev_crit(bci->dev, "VBUS overvoltage\n");
 418
 419         if (irqs2 & TWL4030_ACCHGOV && __ratelimit(&bci->ratelimit))
 420                 dev_crit(bci->dev, "Ac charger overvoltage\n");
 421
 422 #if 0
 423         /* ack the interrupts */
 424         twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, irqs1,
 425                          TWL4030_INTERRUPTS_BCIISR1A);
 426         twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, irqs2,
 427                          TWL4030_INTERRUPTS_BCIISR2A);
 428 #endif
 429
 430         return IRQ_HANDLED;
 431 }
 432
 433 static void twl4030_bci_usb_work(struct work_struct *data)
 434 {
 435         struct twl4030_bci *bci = container_of(data, struct twl4030_bci, work);
 436
 437         switch (bci->event) {
 438         case USB_EVENT_VBUS:
 439         case USB_EVENT_CHARGER:
 440                 twl4030_charger_enable_usb(bci, true);
 441                 break;
 442         case USB_EVENT_NONE:
 443                 twl4030_charger_enable_usb(bci, false);
 444                 break;
 445         }
 446 }
 447
 448 static int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val,
 449                                void *priv)
 450 {
 451         struct twl4030_bci *bci = container_of(nb, struct twl4030_bci, otg_nb);
 452
 453         dev_dbg(bci->dev, "OTG notify %lu\n", val);
 454
 455         bci->event = val;
 456         schedule_work(&bci->work);
 457
 458         return NOTIFY_OK;
 459 }
 460
 461 /*
 462  * TI provided formulas:
 463  * CGAIN == 0: ICHG = (BCIICHG * 1.7) / (2^10 - 1) - 0.85
 464  * CGAIN == 1: ICHG = (BCIICHG * 3.4) / (2^10 - 1) - 1.7
 465  * Here we use integer approximation of:
 466  * CGAIN == 0: val * 1.6618 - 0.85
 467  * CGAIN == 1: (val * 1.6618 - 0.85) * 2
 468  */
 469 static int twl4030_charger_get_current(void)
 470 {
 471         int curr;
 472         int ret;
 473         u8 bcictl1;
 474
 475         curr = twl4030bci_read_adc_val(TWL4030_BCIICHG);
 476         if (curr < 0)
 477                 return curr;
 478
 479         ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
 480         if (ret)
 481                 return ret;
 482
 483         ret = (curr * 16618 - 850 * 10000) / 10;
 484         if (bcictl1 & TWL4030_CGAIN)
 485                 ret *= 2;
 486
 487         return ret;
 488 }
 489
 490 static ssize_t twl4030_bci_ac_show_enable(struct device *dev,
 491                                           struct device_attribute *attr,
 492                                           char *buf)
 493 {
 494         u8 boot_bci;
 495         int ret;
 496
 497         ret = twl_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &boot_bci,
 498                               TWL4030_PM_MASTER_BOOT_BCI);
 499         if (ret)
 500                 return ret;
 501
 502         return sprintf(buf, "%d\n", (boot_bci & TWL4030_BCIAUTOAC) ? 1 : 0);
 503 }
 504
 505 static ssize_t twl4030_bci_ac_store_enable(struct device *dev,
 506                                            struct device_attribute *attr,
 507                                            const char *buf, size_t count)
 508 {
 509         struct power_supply *psy = dev_get_drvdata(dev);
 510         struct twl4030_bci *bci = container_of(psy, struct twl4030_bci, ac);
 511         unsigned long enable;
 512         int ret;
 513
 514         ret = strict_strtoul(buf, 10, &enable);
 515         if (ret || enable > 1)
 516                 return -EINVAL;
 517
 518         bci->ac_charge_enable = enable;
 519         twl4030_charger_enable_ac(enable);
 520
 521         return count;
 522 }
 523 static struct device_attribute dev_attr_enable_ac =
 524         __ATTR(enable, S_IRUGO | S_IWUSR, twl4030_bci_ac_show_enable,
 525         twl4030_bci_ac_store_enable);
 526
 527 static ssize_t twl4030_bci_usb_show_enable(struct device *dev,
 528                                            struct device_attribute *attr,
 529                                            char *buf)
 530 {
 531         u8 boot_bci;
 532         int ret;
 533
 534         ret = twl_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &boot_bci,
 535                               TWL4030_PM_MASTER_BOOT_BCI);
 536         if (ret)
 537                 return ret;
 538
 539         return sprintf(buf, "%d\n", (boot_bci & TWL4030_BCIAUTOUSB) ? 1 : 0);
 540 }
 541
 542 static ssize_t twl4030_bci_usb_store_enable(struct device *dev,
 543                                             struct device_attribute *attr,
 544                                             const char *buf, size_t count)
 545 {
 546         struct power_supply *psy = dev_get_drvdata(dev);
 547         struct twl4030_bci *bci = container_of(psy, struct twl4030_bci, usb);
 548         unsigned long enable;
 549         int ret;
 550
 551         ret = strict_strtoul(buf, 10, &enable);
 552         if (ret || enable > 1)
 553                 return -EINVAL;
 554
 555         bci->usb_charge_enable = enable;
 556         twl4030_charger_enable_usb(bci, enable);
 557
 558         return count;
 559 }
 560 static struct device_attribute dev_attr_enable_usb =
 561         __ATTR(enable, S_IRUGO | S_IWUSR, twl4030_bci_usb_show_enable,
 562         twl4030_bci_usb_store_enable);
 563
 564 static ssize_t show_charge_current(struct device *dev,
 565                         struct device_attribute *attr, char *buf)
 566 {
 567         int ret, val;
 568         u8 ctl;
 569
 570         val = twl4030bci_read_adc_val(TWL4030_BCIIREF1);
 571         if (val < 0)
 572                 return val;
 573         ret = twl4030_bci_read(TWL4030_BCICTL1, &ctl);
 574         if (ret < 0)
 575                 return ret;
 576
 577         val &= 0x1ff;
 578         if (ctl & TWL4030_CGAIN)
 579                 val |= 0x200;
 580
 581         return sprintf(buf, "%d\n", val);
 582 }
 583
 584 static ssize_t store_charge_current(struct device *dev,
 585                         struct device_attribute *attr, const char *buf,
 586                         size_t count)
 587 {
 588         struct power_supply *psy = dev_get_drvdata(dev);
 589         struct twl4030_bci *bci = dev_get_drvdata(psy->dev->parent);
 590         unsigned long new_current;
 591         int ret;
 592
 593         ret = strict_strtoul(buf, 10, &new_current);
 594         if (ret)
 595                 return -EINVAL;
 596
 597         ret = set_charge_current(bci, new_current);
 598         if (ret)
 599                 return ret;
 600
 601         if (psy->type == POWER_SUPPLY_TYPE_MAINS)
 602                 bci->ac_current = new_current;
 603         else
 604                 bci->usb_current = new_current;
 605
 606         return count;
 607 }
 608 static DEVICE_ATTR(charge_current, S_IRUGO | S_IWUSR, show_charge_current,
 609         store_charge_current);
 610
 611 static struct attribute *bci_ac_attrs[] = {
 612         &dev_attr_enable_ac.attr,
 613         &dev_attr_charge_current.attr,
 614         NULL,
 615 };
 616
 617 static struct attribute *bci_usb_attrs[] = {
 618         &dev_attr_enable_usb.attr,
 619         &dev_attr_charge_current.attr,
 620         NULL,
 621 };
 622
 623 static const struct attribute_group bci_ac_attr_group = {
 624         .attrs = bci_ac_attrs,
 625 };
 626
 627 static const struct attribute_group bci_usb_attr_group = {
 628         .attrs = bci_usb_attrs,
 629 };
 630
 631 /*
 632  * Returns the main charge FSM state
 633  * Or < 0 on failure.
 634  */
 635 static int twl4030bci_state(struct twl4030_bci *bci)
 636 {
 637         int ret;
 638         u8 state;
 639
 640         ret = twl4030_bci_read(TWL4030_BCIMSTATEC, &state);
 641         if (ret) {
 642                 pr_err("twl4030_bci: error reading BCIMSTATEC\n");
 643                 return ret;
 644         }
 645
 646         dev_dbg(bci->dev, "state: %02x\n", state);
 647
 648         return state;
 649 }
 650
 651 static int twl4030_bci_state_to_status(int state)
 652 {
 653         state &= TWL4030_MSTATEC_MASK;
 654         if (TWL4030_MSTATEC_QUICK1 <= state && state <= TWL4030_MSTATEC_QUICK7)
 655                 return POWER_SUPPLY_STATUS_CHARGING;
 656         else if (TWL4030_MSTATEC_COMPLETE1 <= state &&
 657                                         state <= TWL4030_MSTATEC_COMPLETE4)
 658                 return POWER_SUPPLY_STATUS_FULL;
 659         else
 660                 return POWER_SUPPLY_STATUS_NOT_CHARGING;
 661 }
 662
 663 static int twl4030_bci_get_property(struct power_supply *psy,
 664                                     enum power_supply_property psp,
 665                                     union power_supply_propval *val)
 666 {
 667         struct twl4030_bci *bci = dev_get_drvdata(psy->dev->parent);
 668         int is_charging;
 669         int state;
 670         int ret;
 671
 672         state = twl4030bci_state(bci);
 673         if (state < 0)
 674                 return state;
 675
 676         if (psy->type == POWER_SUPPLY_TYPE_USB)
 677                 is_charging = state & TWL4030_MSTATEC_USB;
 678         else
 679                 is_charging = state & TWL4030_MSTATEC_AC;
 680         if (is_charging && psy->type != bci->current_supply) {
 681                 if (psy->type == POWER_SUPPLY_TYPE_USB)
 682                         set_charge_current(bci, bci->usb_current);
 683                 else
 684                         set_charge_current(bci, bci->ac_current);
 685                 bci->current_supply = psy->type;
 686         }
 687
 688         switch (psp) {
 689         case POWER_SUPPLY_PROP_STATUS:
 690                 if (is_charging)
 691                         val->intval = twl4030_bci_state_to_status(state);
 692                 else
 693                         val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
 694                 break;
 695         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 696                 /* charging must be active for meaningful result */
 697                 if (!is_charging)
 698                         return -ENODATA;
 699                 if (psy->type == POWER_SUPPLY_TYPE_USB) {
 700                         ret = twl4030bci_read_adc_val(TWL4030_BCIVBUS);
 701                         if (ret < 0)
 702                                 return ret;
 703                         /* BCIVBUS uses ADCIN8, 7/1023 V/step */
 704                         val->intval = ret * 6843;
 705                 } else {
 706                         ret = twl4030bci_read_adc_val(TWL4030_BCIVAC);
 707                         if (ret < 0)
 708                                 return ret;
 709                         /* BCIVAC uses ADCIN11, 10/1023 V/step */
 710                         val->intval = ret * 9775;
 711                 }
 712                 break;
 713         case POWER_SUPPLY_PROP_CURRENT_NOW:
 714                 if (!is_charging)
 715                         return -ENODATA;
 716                 /* current measurement is shared between AC and USB */
 717                 ret = twl4030_charger_get_current();
 718                 if (ret < 0)
 719                         return ret;
 720                 val->intval = ret;
 721                 break;
 722         case POWER_SUPPLY_PROP_ONLINE:
 723                 val->intval = is_charging &&
 724                         twl4030_bci_state_to_status(state) !=
 725                                 POWER_SUPPLY_STATUS_NOT_CHARGING;
 726                 break;
 727         default:
 728                 return -EINVAL;
 729         }
 730
 731         return 0;
 732 }
 733
 734 static enum power_supply_property twl4030_charger_props[] = {
 735         POWER_SUPPLY_PROP_STATUS,
 736         POWER_SUPPLY_PROP_ONLINE,
 737         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 738         POWER_SUPPLY_PROP_CURRENT_NOW,
 739 };
 740
 741 static int __init twl4030_bci_probe(struct platform_device *pdev)
 742 {
 743         const struct twl4030_bci_platform_data *pdata = pdev->dev.platform_data;
 744         struct twl4030_bci *bci;
 745         int ret;
 746         u32 reg;
 747
 748         if (pdata == NULL) {
 749                 dev_err(&pdev->dev, "No platform data\n");
 750                 return -EINVAL;
 751         }
 752
 753         bci = kzalloc(sizeof(*bci), GFP_KERNEL);
 754         if (bci == NULL)
 755                 return -ENOMEM;
 756
 757         bci->dev = &pdev->dev;
 758         bci->irq_chg = platform_get_irq(pdev, 0);
 759         bci->irq_bci = platform_get_irq(pdev, 1);
 760         bci->ac_current = 860; /* ~1.2A */
 761         bci->usb_current = 360; /* ~600mA */
 762         bci->irq_had_charger = -1;
 763         bci->irq_check_count_time = jiffies;
 764
 765         platform_set_drvdata(pdev, bci);
 766
 767         ratelimit_state_init(&bci->ratelimit, HZ, 2);
 768
 769         bci->ac.name = "twl4030_ac";
 770         bci->ac.type = POWER_SUPPLY_TYPE_MAINS;
 771         bci->ac.properties = twl4030_charger_props;
 772         bci->ac.num_properties = ARRAY_SIZE(twl4030_charger_props);
 773         bci->ac.get_property = twl4030_bci_get_property;
 774         bci->ac.supplied_to = pdata->supplied_to;
 775         bci->ac.num_supplicants = pdata->num_supplicants;
 776
 777         ret = power_supply_register(&pdev->dev, &bci->ac);
 778         if (ret) {
 779                 dev_err(&pdev->dev, "failed to register ac: %d\n", ret);
 780                 goto fail_register_ac;
 781         }
 782
 783         bci->usb.name = "twl4030_usb";
 784         bci->usb.type = POWER_SUPPLY_TYPE_USB;
 785         bci->usb.properties = twl4030_charger_props;
 786         bci->usb.num_properties = ARRAY_SIZE(twl4030_charger_props);
 787         bci->usb.get_property = twl4030_bci_get_property;
 788         bci->usb.supplied_to = pdata->supplied_to;
 789         bci->usb.num_supplicants = pdata->num_supplicants;
 790
 791         bci->usb_reg = regulator_get(bci->dev, "bci3v1");
 792         if (IS_ERR(bci->usb_reg)) {
 793                 dev_warn(&pdev->dev, "regulator get bci3v1 failed\n");
 794                 bci->usb_reg = NULL;
 795         }
 796
 797         ret = power_supply_register(&pdev->dev, &bci->usb);
 798         if (ret) {
 799                 dev_err(&pdev->dev, "failed to register usb: %d\n", ret);
 800                 goto fail_register_usb;
 801         }
 802
 803         ret = request_threaded_irq(bci->irq_chg, NULL,
 804                         twl4030_charger_interrupt, 0, pdev->name, bci);
 805         if (ret < 0) {
 806                 dev_err(&pdev->dev, "could not request irq %d, status %d\n",
 807                         bci->irq_chg, ret);
 808                 goto fail_chg_irq;
 809         }
 810
 811         ret = request_threaded_irq(bci->irq_bci, NULL,
 812                         twl4030_bci_interrupt, 0, pdev->name, bci);
 813         if (ret < 0) {
 814                 dev_err(&pdev->dev, "could not request irq %d, status %d\n",
 815                         bci->irq_bci, ret);
 816                 goto fail_bci_irq;
 817         }
 818
 819         INIT_WORK(&bci->work, twl4030_bci_usb_work);
 820
 821         bci->transceiver = otg_get_transceiver();
 822         if (bci->transceiver != NULL) {
 823                 bci->otg_nb.notifier_call = twl4030_bci_usb_ncb;
 824                 otg_register_notifier(bci->transceiver, &bci->otg_nb);
 825         }
 826
 827         ret = sysfs_create_group(&bci->ac.dev->kobj, &bci_ac_attr_group);
 828         if (ret) {
 829                 dev_err(&pdev->dev, "failed to create sysfs group: %d\n", ret);
 830                 goto fail_sysfs1;
 831         }
 832
 833         ret = sysfs_create_group(&bci->usb.dev->kobj, &bci_usb_attr_group);
 834         if (ret) {
 835                 dev_err(&pdev->dev, "failed to create sysfs group: %d\n", ret);
 836                 goto fail_sysfs2;
 837         }
 838
 839         /* Enable interrupts now. */
 840         reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_ICHGEOC | TWL4030_TBATOR2 |
 841                 TWL4030_TBATOR1 | TWL4030_BATSTS);
 842         ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
 843                                TWL4030_INTERRUPTS_BCIIMR1A);
 844         if (ret < 0) {
 845                 dev_err(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
 846                 goto fail_unmask_interrupts;
 847         }
 848
 849         reg = ~(u32)(TWL4030_VBATOV | TWL4030_VBUSOV | TWL4030_ACCHGOV);
 850         ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
 851                                TWL4030_INTERRUPTS_BCIIMR2A);
 852         if (ret < 0)
 853                 dev_warn(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
 854
 855         bci->ac_charge_enable = true;
 856         bci->usb_charge_enable = true;
 857         twl4030_charger_enable_ac(true);
 858         twl4030_charger_enable_usb(bci, true);
 859
 860         return 0;
 861
 862 fail_unmask_interrupts:
 863         sysfs_remove_group(&bci->usb.dev->kobj, &bci_usb_attr_group);
 864 fail_sysfs2:
 865         sysfs_remove_group(&bci->ac.dev->kobj, &bci_ac_attr_group);
 866 fail_sysfs1:
 867         if (bci->transceiver != NULL) {
 868                 otg_unregister_notifier(bci->transceiver, &bci->otg_nb);
 869                 otg_put_transceiver(bci->transceiver);
 870         }
 871         free_irq(bci->irq_bci, bci);
 872 fail_bci_irq:
 873         free_irq(bci->irq_chg, bci);
 874 fail_chg_irq:
 875         power_supply_unregister(&bci->usb);
 876 fail_register_usb:
 877         power_supply_unregister(&bci->ac);
 878 fail_register_ac:
 879         platform_set_drvdata(pdev, NULL);
 880         kfree(bci);
 881
 882         return ret;
 883 }
 884
 885 static int __exit twl4030_bci_remove(struct platform_device *pdev)
 886 {
 887         struct twl4030_bci *bci = platform_get_drvdata(pdev);
 888
 889         sysfs_remove_group(&bci->usb.dev->kobj, &bci_usb_attr_group);
 890         sysfs_remove_group(&bci->ac.dev->kobj, &bci_ac_attr_group);
 891
 892         twl4030_charger_enable_ac(false);
 893         twl4030_charger_enable_usb(bci, false);
 894
 895         /* mask interrupts */
 896         twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
 897                          TWL4030_INTERRUPTS_BCIIMR1A);
 898         twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
 899                          TWL4030_INTERRUPTS_BCIIMR2A);
 900
 901         if (bci->transceiver != NULL) {
 902                 otg_unregister_notifier(bci->transceiver, &bci->otg_nb);
 903                 otg_put_transceiver(bci->transceiver);
 904         }
 905         free_irq(bci->irq_bci, bci);
 906         free_irq(bci->irq_chg, bci);
 907         power_supply_unregister(&bci->usb);
 908         power_supply_unregister(&bci->ac);
 909         platform_set_drvdata(pdev, NULL);
 910         kfree(bci);
 911
 912         return 0;
 913 }
 914
 915 static struct platform_driver twl4030_bci_driver = {
 916         .driver = {
 917                 .name   = "twl4030_bci",
 918                 .owner  = THIS_MODULE,
 919         },
 920         .remove = __exit_p(twl4030_bci_remove),
 921 };
 922
 923 static int __init twl4030_bci_init(void)
 924 {
 925         return platform_driver_probe(&twl4030_bci_driver, twl4030_bci_probe);
 926 }
 927 module_init(twl4030_bci_init);
 928
 929 static void __exit twl4030_bci_exit(void)
 930 {
 931         platform_driver_unregister(&twl4030_bci_driver);
 932 }
 933 module_exit(twl4030_bci_exit);
 934
 935 MODULE_AUTHOR("Gražvydas Ignotas");
 936 MODULE_DESCRIPTION("TWL4030 Battery Charger Interface driver");
 937 MODULE_LICENSE("GPL");
 938 MODULE_ALIAS("platform:twl4030_bci");