drivers/power/smb347-charger.c

   1 /*
   2  * Summit Microelectronics SMB347 Battery Charger Driver
   3  *
   4  * Copyright (C) 2011, Intel Corporation
   5  *
   6  * Authors: Bruce E. Robertson <bruce.e.robertson@intel.com>
   7  *          Mika Westerberg <mika.westerberg@linux.intel.com>
   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 version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/err.h>
  15 #include <linux/gpio.h>
  16 #include <linux/kernel.h>
  17 #include <linux/module.h>
  18 #include <linux/init.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/i2c.h>
  21 #include <linux/mutex.h>
  22 #include <linux/power_supply.h>
  23 #include <linux/power/smb347-charger.h>
  24 #include <linux/regmap.h>
  25
  26 /*
  27  * Configuration registers. These are mirrored to volatile RAM and can be
  28  * written once %CMD_A_ALLOW_WRITE is set in %CMD_A register. They will be
  29  * reloaded from non-volatile registers after POR.
  30  */
  31 #define CFG_CHARGE_CURRENT                      0x00
  32 #define CFG_CHARGE_CURRENT_FCC_MASK             0xe0
  33 #define CFG_CHARGE_CURRENT_FCC_SHIFT            5
  34 #define CFG_CHARGE_CURRENT_PCC_MASK             0x18
  35 #define CFG_CHARGE_CURRENT_PCC_SHIFT            3
  36 #define CFG_CHARGE_CURRENT_TC_MASK              0x07
  37 #define CFG_CURRENT_LIMIT                       0x01
  38 #define CFG_CURRENT_LIMIT_DC_MASK               0xf0
  39 #define CFG_CURRENT_LIMIT_DC_SHIFT              4
  40 #define CFG_CURRENT_LIMIT_USB_MASK              0x0f
  41 #define CFG_FLOAT_VOLTAGE                       0x03
  42 #define CFG_FLOAT_VOLTAGE_FLOAT_MASK            0x3f
  43 #define CFG_FLOAT_VOLTAGE_THRESHOLD_MASK        0xc0
  44 #define CFG_FLOAT_VOLTAGE_THRESHOLD_SHIFT       6
  45 #define CFG_STAT                                0x05
  46 #define CFG_STAT_DISABLED                       BIT(5)
  47 #define CFG_STAT_ACTIVE_HIGH                    BIT(7)
  48 #define CFG_PIN                                 0x06
  49 #define CFG_PIN_EN_CTRL_MASK                    0x60
  50 #define CFG_PIN_EN_CTRL_ACTIVE_HIGH             0x40
  51 #define CFG_PIN_EN_CTRL_ACTIVE_LOW              0x60
  52 #define CFG_PIN_EN_APSD_IRQ                     BIT(1)
  53 #define CFG_PIN_EN_CHARGER_ERROR                BIT(2)
  54 #define CFG_THERM                               0x07
  55 #define CFG_THERM_SOFT_HOT_COMPENSATION_MASK    0x03
  56 #define CFG_THERM_SOFT_HOT_COMPENSATION_SHIFT   0
  57 #define CFG_THERM_SOFT_COLD_COMPENSATION_MASK   0x0c
  58 #define CFG_THERM_SOFT_COLD_COMPENSATION_SHIFT  2
  59 #define CFG_THERM_MONITOR_DISABLED              BIT(4)
  60 #define CFG_SYSOK                               0x08
  61 #define CFG_SYSOK_SUSPEND_HARD_LIMIT_DISABLED   BIT(2)
  62 #define CFG_OTHER                               0x09
  63 #define CFG_OTHER_RID_MASK                      0xc0
  64 #define CFG_OTHER_RID_ENABLED_AUTO_OTG          0xc0
  65 #define CFG_OTG                                 0x0a
  66 #define CFG_OTG_TEMP_THRESHOLD_MASK             0x30
  67 #define CFG_OTG_TEMP_THRESHOLD_SHIFT            4
  68 #define CFG_OTG_CC_COMPENSATION_MASK            0xc0
  69 #define CFG_OTG_CC_COMPENSATION_SHIFT           6
  70 #define CFG_TEMP_LIMIT                          0x0b
  71 #define CFG_TEMP_LIMIT_SOFT_HOT_MASK            0x03
  72 #define CFG_TEMP_LIMIT_SOFT_HOT_SHIFT           0
  73 #define CFG_TEMP_LIMIT_SOFT_COLD_MASK           0x0c
  74 #define CFG_TEMP_LIMIT_SOFT_COLD_SHIFT          2
  75 #define CFG_TEMP_LIMIT_HARD_HOT_MASK            0x30
  76 #define CFG_TEMP_LIMIT_HARD_HOT_SHIFT           4
  77 #define CFG_TEMP_LIMIT_HARD_COLD_MASK           0xc0
  78 #define CFG_TEMP_LIMIT_HARD_COLD_SHIFT          6
  79 #define CFG_FAULT_IRQ                           0x0c
  80 #define CFG_FAULT_IRQ_DCIN_UV                   BIT(2)
  81 #define CFG_STATUS_IRQ                          0x0d
  82 #define CFG_STATUS_IRQ_TERMINATION_OR_TAPER     BIT(4)
  83 #define CFG_STATUS_IRQ_CHARGE_TIMEOUT           BIT(7)
  84 #define CFG_ADDRESS                             0x0e
  85
  86 /* Command registers */
  87 #define CMD_A                                   0x30
  88 #define CMD_A_CHG_ENABLED                       BIT(1)
  89 #define CMD_A_SUSPEND_ENABLED                   BIT(2)
  90 #define CMD_A_ALLOW_WRITE                       BIT(7)
  91 #define CMD_B                                   0x31
  92 #define CMD_C                                   0x33
  93
  94 /* Interrupt Status registers */
  95 #define IRQSTAT_A                               0x35
  96 #define IRQSTAT_C                               0x37
  97 #define IRQSTAT_C_TERMINATION_STAT              BIT(0)
  98 #define IRQSTAT_C_TERMINATION_IRQ               BIT(1)
  99 #define IRQSTAT_C_TAPER_IRQ                     BIT(3)
 100 #define IRQSTAT_D                               0x38
 101 #define IRQSTAT_D_CHARGE_TIMEOUT_STAT           BIT(2)
 102 #define IRQSTAT_D_CHARGE_TIMEOUT_IRQ            BIT(3)
 103 #define IRQSTAT_E                               0x39
 104 #define IRQSTAT_E_USBIN_UV_STAT                 BIT(0)
 105 #define IRQSTAT_E_USBIN_UV_IRQ                  BIT(1)
 106 #define IRQSTAT_E_DCIN_UV_STAT                  BIT(4)
 107 #define IRQSTAT_E_DCIN_UV_IRQ                   BIT(5)
 108 #define IRQSTAT_F                               0x3a
 109
 110 /* Status registers */
 111 #define STAT_A                                  0x3b
 112 #define STAT_A_FLOAT_VOLTAGE_MASK               0x3f
 113 #define STAT_B                                  0x3c
 114 #define STAT_C                                  0x3d
 115 #define STAT_C_CHG_ENABLED                      BIT(0)
 116 #define STAT_C_HOLDOFF_STAT                     BIT(3)
 117 #define STAT_C_CHG_MASK                         0x06
 118 #define STAT_C_CHG_SHIFT                        1
 119 #define STAT_C_CHG_TERM                         BIT(5)
 120 #define STAT_C_CHARGER_ERROR                    BIT(6)
 121 #define STAT_E                                  0x3f
 122
 123 #define SMB347_MAX_REGISTER                     0x3f
 124
 125 /**
 126  * struct smb347_charger - smb347 charger instance
 127  * @lock: protects concurrent access to online variables
 128  * @dev: pointer to device
 129  * @regmap: pointer to driver regmap
 130  * @mains: power_supply instance for AC/DC power
 131  * @usb: power_supply instance for USB power
 132  * @battery: power_supply instance for battery
 133  * @mains_online: is AC/DC input connected
 134  * @usb_online: is USB input connected
 135  * @charging_enabled: is charging enabled
 136  * @pdata: pointer to platform data
 137  */
 138 struct smb347_charger {
 139         struct mutex            lock;
 140         struct device           *dev;
 141         struct regmap           *regmap;
 142         struct power_supply     mains;
 143         struct power_supply     usb;
 144         struct power_supply     battery;
 145         bool                    mains_online;
 146         bool                    usb_online;
 147         bool                    charging_enabled;
 148         const struct smb347_charger_platform_data *pdata;
 149 };
 150
 151 /* Fast charge current in uA */
 152 static const unsigned int fcc_tbl[] = {
 153         700000,
 154         900000,
 155         1200000,
 156         1500000,
 157         1800000,
 158         2000000,
 159         2200000,
 160         2500000,
 161 };
 162
 163 /* Pre-charge current in uA */
 164 static const unsigned int pcc_tbl[] = {
 165         100000,
 166         150000,
 167         200000,
 168         250000,
 169 };
 170
 171 /* Termination current in uA */
 172 static const unsigned int tc_tbl[] = {
 173         37500,
 174         50000,
 175         100000,
 176         150000,
 177         200000,
 178         250000,
 179         500000,
 180         600000,
 181 };
 182
 183 /* Input current limit in uA */
 184 static const unsigned int icl_tbl[] = {
 185         300000,
 186         500000,
 187         700000,
 188         900000,
 189         1200000,
 190         1500000,
 191         1800000,
 192         2000000,
 193         2200000,
 194         2500000,
 195 };
 196
 197 /* Charge current compensation in uA */
 198 static const unsigned int ccc_tbl[] = {
 199         250000,
 200         700000,
 201         900000,
 202         1200000,
 203 };
 204
 205 /* Convert register value to current using lookup table */
 206 static int hw_to_current(const unsigned int *tbl, size_t size, unsigned int val)
 207 {
 208         if (val >= size)
 209                 return -EINVAL;
 210         return tbl[val];
 211 }
 212
 213 /* Convert current to register value using lookup table */
 214 static int current_to_hw(const unsigned int *tbl, size_t size, unsigned int val)
 215 {
 216         size_t i;
 217
 218         for (i = 0; i < size; i++)
 219                 if (val < tbl[i])
 220                         break;
 221         return i > 0 ? i - 1 : -EINVAL;
 222 }
 223
 224 /**
 225  * smb347_update_ps_status - refreshes the power source status
 226  * @smb: pointer to smb347 charger instance
 227  *
 228  * Function checks whether any power source is connected to the charger and
 229  * updates internal state accordingly. If there is a change to previous state
 230  * function returns %1, otherwise %0 and negative errno in case of errror.
 231  */
 232 static int smb347_update_ps_status(struct smb347_charger *smb)
 233 {
 234         bool usb = false;
 235         bool dc = false;
 236         unsigned int val;
 237         int ret;
 238
 239         ret = regmap_read(smb->regmap, IRQSTAT_E, &val);
 240         if (ret < 0)
 241                 return ret;
 242
 243         /*
 244          * Dc and usb are set depending on whether they are enabled in
 245          * platform data _and_ whether corresponding undervoltage is set.
 246          */
 247         if (smb->pdata->use_mains)
 248                 dc = !(val & IRQSTAT_E_DCIN_UV_STAT);
 249         if (smb->pdata->use_usb)
 250                 usb = !(val & IRQSTAT_E_USBIN_UV_STAT);
 251
 252         mutex_lock(&smb->lock);
 253         ret = smb->mains_online != dc || smb->usb_online != usb;
 254         smb->mains_online = dc;
 255         smb->usb_online = usb;
 256         mutex_unlock(&smb->lock);
 257
 258         return ret;
 259 }
 260
 261 /*
 262  * smb347_is_ps_online - returns whether input power source is connected
 263  * @smb: pointer to smb347 charger instance
 264  *
 265  * Returns %true if input power source is connected. Note that this is
 266  * dependent on what platform has configured for usable power sources. For
 267  * example if USB is disabled, this will return %false even if the USB cable
 268  * is connected.
 269  */
 270 static bool smb347_is_ps_online(struct smb347_charger *smb)
 271 {
 272         bool ret;
 273
 274         mutex_lock(&smb->lock);
 275         ret = smb->usb_online || smb->mains_online;
 276         mutex_unlock(&smb->lock);
 277
 278         return ret;
 279 }
 280
 281 /**
 282  * smb347_charging_status - returns status of charging
 283  * @smb: pointer to smb347 charger instance
 284  *
 285  * Function returns charging status. %0 means no charging is in progress,
 286  * %1 means pre-charging, %2 fast-charging and %3 taper-charging.
 287  */
 288 static int smb347_charging_status(struct smb347_charger *smb)
 289 {
 290         unsigned int val;
 291         int ret;
 292
 293         if (!smb347_is_ps_online(smb))
 294                 return 0;
 295
 296         ret = regmap_read(smb->regmap, STAT_C, &val);
 297         if (ret < 0)
 298                 return 0;
 299
 300         return (val & STAT_C_CHG_MASK) >> STAT_C_CHG_SHIFT;
 301 }
 302
 303 static int smb347_charging_set(struct smb347_charger *smb, bool enable)
 304 {
 305         int ret = 0;
 306
 307         if (smb->pdata->enable_control != SMB347_CHG_ENABLE_SW) {
 308                 dev_dbg(smb->dev, "charging enable/disable in SW disabled\n");
 309                 return 0;
 310         }
 311
 312         mutex_lock(&smb->lock);
 313         if (smb->charging_enabled != enable) {
 314                 ret = regmap_update_bits(smb->regmap, CMD_A, CMD_A_CHG_ENABLED,
 315                                          enable ? CMD_A_CHG_ENABLED : 0);
 316                 if (!ret)
 317                         smb->charging_enabled = enable;
 318         }
 319         mutex_unlock(&smb->lock);
 320         return ret;
 321 }
 322
 323 static inline int smb347_charging_enable(struct smb347_charger *smb)
 324 {
 325         return smb347_charging_set(smb, true);
 326 }
 327
 328 static inline int smb347_charging_disable(struct smb347_charger *smb)
 329 {
 330         return smb347_charging_set(smb, false);
 331 }
 332
 333 static int smb347_start_stop_charging(struct smb347_charger *smb)
 334 {
 335         int ret;
 336
 337         /*
 338          * Depending on whether valid power source is connected or not, we
 339          * disable or enable the charging. We do it manually because it
 340          * depends on how the platform has configured the valid inputs.
 341          */
 342         if (smb347_is_ps_online(smb)) {
 343                 ret = smb347_charging_enable(smb);
 344                 if (ret < 0)
 345                         dev_err(smb->dev, "failed to enable charging\n");
 346         } else {
 347                 ret = smb347_charging_disable(smb);
 348                 if (ret < 0)
 349                         dev_err(smb->dev, "failed to disable charging\n");
 350         }
 351
 352         return ret;
 353 }
 354
 355 static int smb347_set_charge_current(struct smb347_charger *smb)
 356 {
 357         int ret;
 358
 359         if (smb->pdata->max_charge_current) {
 360                 ret = current_to_hw(fcc_tbl, ARRAY_SIZE(fcc_tbl),
 361                                     smb->pdata->max_charge_current);
 362                 if (ret < 0)
 363                         return ret;
 364
 365                 ret = regmap_update_bits(smb->regmap, CFG_CHARGE_CURRENT,
 366                                          CFG_CHARGE_CURRENT_FCC_MASK,
 367                                          ret << CFG_CHARGE_CURRENT_FCC_SHIFT);
 368                 if (ret < 0)
 369                         return ret;
 370         }
 371
 372         if (smb->pdata->pre_charge_current) {
 373                 ret = current_to_hw(pcc_tbl, ARRAY_SIZE(pcc_tbl),
 374                                     smb->pdata->pre_charge_current);
 375                 if (ret < 0)
 376                         return ret;
 377
 378                 ret = regmap_update_bits(smb->regmap, CFG_CHARGE_CURRENT,
 379                                          CFG_CHARGE_CURRENT_PCC_MASK,
 380                                          ret << CFG_CHARGE_CURRENT_PCC_SHIFT);
 381                 if (ret < 0)
 382                         return ret;
 383         }
 384
 385         if (smb->pdata->termination_current) {
 386                 ret = current_to_hw(tc_tbl, ARRAY_SIZE(tc_tbl),
 387                                     smb->pdata->termination_current);
 388                 if (ret < 0)
 389                         return ret;
 390
 391                 ret = regmap_update_bits(smb->regmap, CFG_CHARGE_CURRENT,
 392                                          CFG_CHARGE_CURRENT_TC_MASK, ret);
 393                 if (ret < 0)
 394                         return ret;
 395         }
 396
 397         return 0;
 398 }
 399
 400 static int smb347_set_current_limits(struct smb347_charger *smb)
 401 {
 402         int ret;
 403
 404         if (smb->pdata->mains_current_limit) {
 405                 ret = current_to_hw(icl_tbl, ARRAY_SIZE(icl_tbl),
 406                                     smb->pdata->mains_current_limit);
 407                 if (ret < 0)
 408                         return ret;
 409
 410                 ret = regmap_update_bits(smb->regmap, CFG_CURRENT_LIMIT,
 411                                          CFG_CURRENT_LIMIT_DC_MASK,
 412                                          ret << CFG_CURRENT_LIMIT_DC_SHIFT);
 413                 if (ret < 0)
 414                         return ret;
 415         }
 416
 417         if (smb->pdata->usb_hc_current_limit) {
 418                 ret = current_to_hw(icl_tbl, ARRAY_SIZE(icl_tbl),
 419                                     smb->pdata->usb_hc_current_limit);
 420                 if (ret < 0)
 421                         return ret;
 422
 423                 ret = regmap_update_bits(smb->regmap, CFG_CURRENT_LIMIT,
 424                                          CFG_CURRENT_LIMIT_USB_MASK, ret);
 425                 if (ret < 0)
 426                         return ret;
 427         }
 428
 429         return 0;
 430 }
 431
 432 static int smb347_set_voltage_limits(struct smb347_charger *smb)
 433 {
 434         int ret;
 435
 436         if (smb->pdata->pre_to_fast_voltage) {
 437                 ret = smb->pdata->pre_to_fast_voltage;
 438
 439                 /* uV */
 440                 ret = clamp_val(ret, 2400000, 3000000) - 2400000;
 441                 ret /= 200000;
 442
 443                 ret = regmap_update_bits(smb->regmap, CFG_FLOAT_VOLTAGE,
 444                                 CFG_FLOAT_VOLTAGE_THRESHOLD_MASK,
 445                                 ret << CFG_FLOAT_VOLTAGE_THRESHOLD_SHIFT);
 446                 if (ret < 0)
 447                         return ret;
 448         }
 449
 450         if (smb->pdata->max_charge_voltage) {
 451                 ret = smb->pdata->max_charge_voltage;
 452
 453                 /* uV */
 454                 ret = clamp_val(ret, 3500000, 4500000) - 3500000;
 455                 ret /= 20000;
 456
 457                 ret = regmap_update_bits(smb->regmap, CFG_FLOAT_VOLTAGE,
 458                                          CFG_FLOAT_VOLTAGE_FLOAT_MASK, ret);
 459                 if (ret < 0)
 460                         return ret;
 461         }
 462
 463         return 0;
 464 }
 465
 466 static int smb347_set_temp_limits(struct smb347_charger *smb)
 467 {
 468         bool enable_therm_monitor = false;
 469         int ret = 0;
 470         int val;
 471
 472         if (smb->pdata->chip_temp_threshold) {
 473                 val = smb->pdata->chip_temp_threshold;
 474
 475                 /* degree C */
 476                 val = clamp_val(val, 100, 130) - 100;
 477                 val /= 10;
 478
 479                 ret = regmap_update_bits(smb->regmap, CFG_OTG,
 480                                          CFG_OTG_TEMP_THRESHOLD_MASK,
 481                                          val << CFG_OTG_TEMP_THRESHOLD_SHIFT);
 482                 if (ret < 0)
 483                         return ret;
 484         }
 485
 486         if (smb->pdata->soft_cold_temp_limit != SMB347_TEMP_USE_DEFAULT) {
 487                 val = smb->pdata->soft_cold_temp_limit;
 488
 489                 val = clamp_val(val, 0, 15);
 490                 val /= 5;
 491                 /* this goes from higher to lower so invert the value */
 492                 val = ~val & 0x3;
 493
 494                 ret = regmap_update_bits(smb->regmap, CFG_TEMP_LIMIT,
 495                                          CFG_TEMP_LIMIT_SOFT_COLD_MASK,
 496                                          val << CFG_TEMP_LIMIT_SOFT_COLD_SHIFT);
 497                 if (ret < 0)
 498                         return ret;
 499
 500                 enable_therm_monitor = true;
 501         }
 502
 503         if (smb->pdata->soft_hot_temp_limit != SMB347_TEMP_USE_DEFAULT) {
 504                 val = smb->pdata->soft_hot_temp_limit;
 505
 506                 val = clamp_val(val, 40, 55) - 40;
 507                 val /= 5;
 508
 509                 ret = regmap_update_bits(smb->regmap, CFG_TEMP_LIMIT,
 510                                          CFG_TEMP_LIMIT_SOFT_HOT_MASK,
 511                                          val << CFG_TEMP_LIMIT_SOFT_HOT_SHIFT);
 512                 if (ret < 0)
 513                         return ret;
 514
 515                 enable_therm_monitor = true;
 516         }
 517
 518         if (smb->pdata->hard_cold_temp_limit != SMB347_TEMP_USE_DEFAULT) {
 519                 val = smb->pdata->hard_cold_temp_limit;
 520
 521                 val = clamp_val(val, -5, 10) + 5;
 522                 val /= 5;
 523                 /* this goes from higher to lower so invert the value */
 524                 val = ~val & 0x3;
 525
 526                 ret = regmap_update_bits(smb->regmap, CFG_TEMP_LIMIT,
 527                                          CFG_TEMP_LIMIT_HARD_COLD_MASK,
 528                                          val << CFG_TEMP_LIMIT_HARD_COLD_SHIFT);
 529                 if (ret < 0)
 530                         return ret;
 531
 532                 enable_therm_monitor = true;
 533         }
 534
 535         if (smb->pdata->hard_hot_temp_limit != SMB347_TEMP_USE_DEFAULT) {
 536                 val = smb->pdata->hard_hot_temp_limit;
 537
 538                 val = clamp_val(val, 50, 65) - 50;
 539                 val /= 5;
 540
 541                 ret = regmap_update_bits(smb->regmap, CFG_TEMP_LIMIT,
 542                                          CFG_TEMP_LIMIT_HARD_HOT_MASK,
 543                                          val << CFG_TEMP_LIMIT_HARD_HOT_SHIFT);
 544                 if (ret < 0)
 545                         return ret;
 546
 547                 enable_therm_monitor = true;
 548         }
 549
 550         /*
 551          * If any of the temperature limits are set, we also enable the
 552          * thermistor monitoring.
 553          *
 554          * When soft limits are hit, the device will start to compensate
 555          * current and/or voltage depending on the configuration.
 556          *
 557          * When hard limit is hit, the device will suspend charging
 558          * depending on the configuration.
 559          */
 560         if (enable_therm_monitor) {
 561                 ret = regmap_update_bits(smb->regmap, CFG_THERM,
 562                                          CFG_THERM_MONITOR_DISABLED, 0);
 563                 if (ret < 0)
 564                         return ret;
 565         }
 566
 567         if (smb->pdata->suspend_on_hard_temp_limit) {
 568                 ret = regmap_update_bits(smb->regmap, CFG_SYSOK,
 569                                  CFG_SYSOK_SUSPEND_HARD_LIMIT_DISABLED, 0);
 570                 if (ret < 0)
 571                         return ret;
 572         }
 573
 574         if (smb->pdata->soft_temp_limit_compensation !=
 575             SMB347_SOFT_TEMP_COMPENSATE_DEFAULT) {
 576                 val = smb->pdata->soft_temp_limit_compensation & 0x3;
 577
 578                 ret = regmap_update_bits(smb->regmap, CFG_THERM,
 579                                  CFG_THERM_SOFT_HOT_COMPENSATION_MASK,
 580                                  val << CFG_THERM_SOFT_HOT_COMPENSATION_SHIFT);
 581                 if (ret < 0)
 582                         return ret;
 583
 584                 ret = regmap_update_bits(smb->regmap, CFG_THERM,
 585                                  CFG_THERM_SOFT_COLD_COMPENSATION_MASK,
 586                                  val << CFG_THERM_SOFT_COLD_COMPENSATION_SHIFT);
 587                 if (ret < 0)
 588                         return ret;
 589         }
 590
 591         if (smb->pdata->charge_current_compensation) {
 592                 val = current_to_hw(ccc_tbl, ARRAY_SIZE(ccc_tbl),
 593                                     smb->pdata->charge_current_compensation);
 594                 if (val < 0)
 595                         return val;
 596
 597                 ret = regmap_update_bits(smb->regmap, CFG_OTG,
 598                                 CFG_OTG_CC_COMPENSATION_MASK,
 599                                 (val & 0x3) << CFG_OTG_CC_COMPENSATION_SHIFT);
 600                 if (ret < 0)
 601                         return ret;
 602         }
 603
 604         return ret;
 605 }
 606
 607 /*
 608  * smb347_set_writable - enables/disables writing to non-volatile registers
 609  * @smb: pointer to smb347 charger instance
 610  *
 611  * You can enable/disable writing to the non-volatile configuration
 612  * registers by calling this function.
 613  *
 614  * Returns %0 on success and negative errno in case of failure.
 615  */
 616 static int smb347_set_writable(struct smb347_charger *smb, bool writable)
 617 {
 618         return regmap_update_bits(smb->regmap, CMD_A, CMD_A_ALLOW_WRITE,
 619                                   writable ? CMD_A_ALLOW_WRITE : 0);
 620 }
 621
 622 static int smb347_hw_init(struct smb347_charger *smb)
 623 {
 624         unsigned int val;
 625         int ret;
 626
 627         ret = smb347_set_writable(smb, true);
 628         if (ret < 0)
 629                 return ret;
 630
 631         /*
 632          * Program the platform specific configuration values to the device
 633          * first.
 634          */
 635         ret = smb347_set_charge_current(smb);
 636         if (ret < 0)
 637                 goto fail;
 638
 639         ret = smb347_set_current_limits(smb);
 640         if (ret < 0)
 641                 goto fail;
 642
 643         ret = smb347_set_voltage_limits(smb);
 644         if (ret < 0)
 645                 goto fail;
 646
 647         ret = smb347_set_temp_limits(smb);
 648         if (ret < 0)
 649                 goto fail;
 650
 651         /* If USB charging is disabled we put the USB in suspend mode */
 652         if (!smb->pdata->use_usb) {
 653                 ret = regmap_update_bits(smb->regmap, CMD_A,
 654                                          CMD_A_SUSPEND_ENABLED,
 655                                          CMD_A_SUSPEND_ENABLED);
 656                 if (ret < 0)
 657                         goto fail;
 658         }
 659
 660         /*
 661          * If configured by platform data, we enable hardware Auto-OTG
 662          * support for driving VBUS. Otherwise we disable it.
 663          */
 664         ret = regmap_update_bits(smb->regmap, CFG_OTHER, CFG_OTHER_RID_MASK,
 665                 smb->pdata->use_usb_otg ? CFG_OTHER_RID_ENABLED_AUTO_OTG : 0);
 666         if (ret < 0)
 667                 goto fail;
 668
 669         /*
 670          * Make the charging functionality controllable by a write to the
 671          * command register unless pin control is specified in the platform
 672          * data.
 673          */
 674         switch (smb->pdata->enable_control) {
 675         case SMB347_CHG_ENABLE_PIN_ACTIVE_LOW:
 676                 val = CFG_PIN_EN_CTRL_ACTIVE_LOW;
 677                 break;
 678         case SMB347_CHG_ENABLE_PIN_ACTIVE_HIGH:
 679                 val = CFG_PIN_EN_CTRL_ACTIVE_HIGH;
 680                 break;
 681         default:
 682                 val = 0;
 683                 break;
 684         }
 685
 686         ret = regmap_update_bits(smb->regmap, CFG_PIN, CFG_PIN_EN_CTRL_MASK,
 687                                  val);
 688         if (ret < 0)
 689                 goto fail;
 690
 691         /* Disable Automatic Power Source Detection (APSD) interrupt. */
 692         ret = regmap_update_bits(smb->regmap, CFG_PIN, CFG_PIN_EN_APSD_IRQ, 0);
 693         if (ret < 0)
 694                 goto fail;
 695
 696         ret = smb347_update_ps_status(smb);
 697         if (ret < 0)
 698                 goto fail;
 699
 700         ret = smb347_start_stop_charging(smb);
 701
 702 fail:
 703         smb347_set_writable(smb, false);
 704         return ret;
 705 }
 706
 707 static irqreturn_t smb347_interrupt(int irq, void *data)
 708 {
 709         struct smb347_charger *smb = data;
 710         unsigned int stat_c, irqstat_c, irqstat_d, irqstat_e;
 711         bool handled = false;
 712         int ret;
 713
 714         ret = regmap_read(smb->regmap, STAT_C, &stat_c);
 715         if (ret < 0) {
 716                 dev_warn(smb->dev, "reading STAT_C failed\n");
 717                 return IRQ_NONE;
 718         }
 719
 720         ret = regmap_read(smb->regmap, IRQSTAT_C, &irqstat_c);
 721         if (ret < 0) {
 722                 dev_warn(smb->dev, "reading IRQSTAT_C failed\n");
 723                 return IRQ_NONE;
 724         }
 725
 726         ret = regmap_read(smb->regmap, IRQSTAT_D, &irqstat_d);
 727         if (ret < 0) {
 728                 dev_warn(smb->dev, "reading IRQSTAT_D failed\n");
 729                 return IRQ_NONE;
 730         }
 731
 732         ret = regmap_read(smb->regmap, IRQSTAT_E, &irqstat_e);
 733         if (ret < 0) {
 734                 dev_warn(smb->dev, "reading IRQSTAT_E failed\n");
 735                 return IRQ_NONE;
 736         }
 737
 738         /*
 739          * If we get charger error we report the error back to user.
 740          * If the error is recovered charging will resume again.
 741          */
 742         if (stat_c & STAT_C_CHARGER_ERROR) {
 743                 dev_err(smb->dev, "charging stopped due to charger error\n");
 744                 power_supply_changed(&smb->battery);
 745                 handled = true;
 746         }
 747
 748         /*
 749          * If we reached the termination current the battery is charged and
 750          * we can update the status now. Charging is automatically
 751          * disabled by the hardware.
 752          */
 753         if (irqstat_c & (IRQSTAT_C_TERMINATION_IRQ | IRQSTAT_C_TAPER_IRQ)) {
 754                 if (irqstat_c & IRQSTAT_C_TERMINATION_STAT)
 755                         power_supply_changed(&smb->battery);
 756                 dev_dbg(smb->dev, "going to HW maintenance mode\n");
 757                 handled = true;
 758         }
 759
 760         /*
 761          * If we got a charger timeout INT that means the charge
 762          * full is not detected with in charge timeout value.
 763          */
 764         if (irqstat_d & IRQSTAT_D_CHARGE_TIMEOUT_IRQ) {
 765                 dev_dbg(smb->dev, "total Charge Timeout INT received\n");
 766
 767                 if (irqstat_d & IRQSTAT_D_CHARGE_TIMEOUT_STAT)
 768                         dev_warn(smb->dev, "charging stopped due to timeout\n");
 769                 power_supply_changed(&smb->battery);
 770                 handled = true;
 771         }
 772
 773         /*
 774          * If we got an under voltage interrupt it means that AC/USB input
 775          * was connected or disconnected.
 776          */
 777         if (irqstat_e & (IRQSTAT_E_USBIN_UV_IRQ | IRQSTAT_E_DCIN_UV_IRQ)) {
 778                 if (smb347_update_ps_status(smb) > 0) {
 779                         smb347_start_stop_charging(smb);
 780                         if (smb->pdata->use_mains)
 781                                 power_supply_changed(&smb->mains);
 782                         if (smb->pdata->use_usb)
 783                                 power_supply_changed(&smb->usb);
 784                 }
 785                 handled = true;
 786         }
 787
 788         return handled ? IRQ_HANDLED : IRQ_NONE;
 789 }
 790
 791 static int smb347_irq_set(struct smb347_charger *smb, bool enable)
 792 {
 793         int ret;
 794
 795         ret = smb347_set_writable(smb, true);
 796         if (ret < 0)
 797                 return ret;
 798
 799         /*
 800          * Enable/disable interrupts for:
 801          *      - under voltage
 802          *      - termination current reached
 803          *      - charger timeout
 804          *      - charger error
 805          */
 806         ret = regmap_update_bits(smb->regmap, CFG_FAULT_IRQ, 0xff,
 807                                  enable ? CFG_FAULT_IRQ_DCIN_UV : 0);
 808         if (ret < 0)
 809                 goto fail;
 810
 811         ret = regmap_update_bits(smb->regmap, CFG_STATUS_IRQ, 0xff,
 812                         enable ? (CFG_STATUS_IRQ_TERMINATION_OR_TAPER |
 813                                         CFG_STATUS_IRQ_CHARGE_TIMEOUT) : 0);
 814         if (ret < 0)
 815                 goto fail;
 816
 817         ret = regmap_update_bits(smb->regmap, CFG_PIN, CFG_PIN_EN_CHARGER_ERROR,
 818                                  enable ? CFG_PIN_EN_CHARGER_ERROR : 0);
 819 fail:
 820         smb347_set_writable(smb, false);
 821         return ret;
 822 }
 823
 824 static inline int smb347_irq_enable(struct smb347_charger *smb)
 825 {
 826         return smb347_irq_set(smb, true);
 827 }
 828
 829 static inline int smb347_irq_disable(struct smb347_charger *smb)
 830 {
 831         return smb347_irq_set(smb, false);
 832 }
 833
 834 static int smb347_irq_init(struct smb347_charger *smb,
 835                            struct i2c_client *client)
 836 {
 837         const struct smb347_charger_platform_data *pdata = smb->pdata;
 838         int ret, irq = gpio_to_irq(pdata->irq_gpio);
 839
 840         ret = gpio_request_one(pdata->irq_gpio, GPIOF_IN, client->name);
 841         if (ret < 0)
 842                 goto fail;
 843
 844         ret = request_threaded_irq(irq, NULL, smb347_interrupt,
 845                                    IRQF_TRIGGER_FALLING, client->name, smb);
 846         if (ret < 0)
 847                 goto fail_gpio;
 848
 849         ret = smb347_set_writable(smb, true);
 850         if (ret < 0)
 851                 goto fail_irq;
 852
 853         /*
 854          * Configure the STAT output to be suitable for interrupts: disable
 855          * all other output (except interrupts) and make it active low.
 856          */
 857         ret = regmap_update_bits(smb->regmap, CFG_STAT,
 858                                  CFG_STAT_ACTIVE_HIGH | CFG_STAT_DISABLED,
 859                                  CFG_STAT_DISABLED);
 860         if (ret < 0)
 861                 goto fail_readonly;
 862
 863         smb347_set_writable(smb, false);
 864         client->irq = irq;
 865         return 0;
 866
 867 fail_readonly:
 868         smb347_set_writable(smb, false);
 869 fail_irq:
 870         free_irq(irq, smb);
 871 fail_gpio:
 872         gpio_free(pdata->irq_gpio);
 873 fail:
 874         client->irq = 0;
 875         return ret;
 876 }
 877
 878 /*
 879  * Returns the constant charge current programmed
 880  * into the charger in uA.
 881  */
 882 static int get_const_charge_current(struct smb347_charger *smb)
 883 {
 884         int ret, intval;
 885         unsigned int v;
 886
 887         if (!smb347_is_ps_online(smb))
 888                 return -ENODATA;
 889
 890         ret = regmap_read(smb->regmap, STAT_B, &v);
 891         if (ret < 0)
 892                 return ret;
 893
 894         /*
 895          * The current value is composition of FCC and PCC values
 896          * and we can detect which table to use from bit 5.
 897          */
 898         if (v & 0x20) {
 899                 intval = hw_to_current(fcc_tbl, ARRAY_SIZE(fcc_tbl), v & 7);
 900         } else {
 901                 v >>= 3;
 902                 intval = hw_to_current(pcc_tbl, ARRAY_SIZE(pcc_tbl), v & 7);
 903         }
 904
 905         return intval;
 906 }
 907
 908 /*
 909  * Returns the constant charge voltage programmed
 910  * into the charger in uV.
 911  */
 912 static int get_const_charge_voltage(struct smb347_charger *smb)
 913 {
 914         int ret, intval;
 915         unsigned int v;
 916
 917         if (!smb347_is_ps_online(smb))
 918                 return -ENODATA;
 919
 920         ret = regmap_read(smb->regmap, STAT_A, &v);
 921         if (ret < 0)
 922                 return ret;
 923
 924         v &= STAT_A_FLOAT_VOLTAGE_MASK;
 925         if (v > 0x3d)
 926                 v = 0x3d;
 927
 928         intval = 3500000 + v * 20000;
 929
 930         return intval;
 931 }
 932
 933 static int smb347_mains_get_property(struct power_supply *psy,
 934                                      enum power_supply_property prop,
 935                                      union power_supply_propval *val)
 936 {
 937         struct smb347_charger *smb =
 938                 container_of(psy, struct smb347_charger, mains);
 939         int ret;
 940
 941         switch (prop) {
 942         case POWER_SUPPLY_PROP_ONLINE:
 943                 val->intval = smb->mains_online;
 944                 break;
 945
 946         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
 947                 ret = get_const_charge_voltage(smb);
 948                 if (ret < 0)
 949                         return ret;
 950                 else
 951                         val->intval = ret;
 952                 break;
 953
 954         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
 955                 ret = get_const_charge_current(smb);
 956                 if (ret < 0)
 957                         return ret;
 958                 else
 959                         val->intval = ret;
 960                 break;
 961
 962         default:
 963                 return -EINVAL;
 964         }
 965
 966         return 0;
 967 }
 968
 969 static enum power_supply_property smb347_mains_properties[] = {
 970         POWER_SUPPLY_PROP_ONLINE,
 971         POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
 972         POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
 973 };
 974
 975 static int smb347_usb_get_property(struct power_supply *psy,
 976                                    enum power_supply_property prop,
 977                                    union power_supply_propval *val)
 978 {
 979         struct smb347_charger *smb =
 980                 container_of(psy, struct smb347_charger, usb);
 981         int ret;
 982
 983         switch (prop) {
 984         case POWER_SUPPLY_PROP_ONLINE:
 985                 val->intval = smb->usb_online;
 986                 break;
 987
 988         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
 989                 ret = get_const_charge_voltage(smb);
 990                 if (ret < 0)
 991                         return ret;
 992                 else
 993                         val->intval = ret;
 994                 break;
 995
 996         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
 997                 ret = get_const_charge_current(smb);
 998                 if (ret < 0)
 999                         return ret;
1000                 else
1001                         val->intval = ret;
1002                 break;
1003
1004         default:
1005                 return -EINVAL;
1006         }
1007
1008         return 0;
1009 }
1010
1011 static enum power_supply_property smb347_usb_properties[] = {
1012         POWER_SUPPLY_PROP_ONLINE,
1013         POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
1014         POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
1015 };
1016
1017 static int smb347_get_charging_status(struct smb347_charger *smb)
1018 {
1019         int ret, status;
1020         unsigned int val;
1021
1022         if (!smb347_is_ps_online(smb))
1023                 return POWER_SUPPLY_STATUS_DISCHARGING;
1024
1025         ret = regmap_read(smb->regmap, STAT_C, &val);
1026         if (ret < 0)
1027                 return ret;
1028
1029         if ((val & STAT_C_CHARGER_ERROR) ||
1030                         (val & STAT_C_HOLDOFF_STAT)) {
1031                 /*
1032                  * set to NOT CHARGING upon charger error
1033                  * or charging has stopped.
1034                  */
1035                 status = POWER_SUPPLY_STATUS_NOT_CHARGING;
1036         } else {
1037                 if ((val & STAT_C_CHG_MASK) >> STAT_C_CHG_SHIFT) {
1038                         /*
1039                          * set to charging if battery is in pre-charge,
1040                          * fast charge or taper charging mode.
1041                          */
1042                         status = POWER_SUPPLY_STATUS_CHARGING;
1043                 } else if (val & STAT_C_CHG_TERM) {
1044                         /*
1045                          * set the status to FULL if battery is not in pre
1046                          * charge, fast charge or taper charging mode AND
1047                          * charging is terminated at least once.
1048                          */
1049                         status = POWER_SUPPLY_STATUS_FULL;
1050                 } else {
1051                         /*
1052                          * in this case no charger error or termination
1053                          * occured but charging is not in progress!!!
1054                          */
1055                         status = POWER_SUPPLY_STATUS_NOT_CHARGING;
1056                 }
1057         }
1058
1059         return status;
1060 }
1061
1062 static int smb347_battery_get_property(struct power_supply *psy,
1063                                        enum power_supply_property prop,
1064                                        union power_supply_propval *val)
1065 {
1066         struct smb347_charger *smb =
1067                         container_of(psy, struct smb347_charger, battery);
1068         const struct smb347_charger_platform_data *pdata = smb->pdata;
1069         int ret;
1070
1071         ret = smb347_update_ps_status(smb);
1072         if (ret < 0)
1073                 return ret;
1074
1075         switch (prop) {
1076         case POWER_SUPPLY_PROP_STATUS:
1077                 ret = smb347_get_charging_status(smb);
1078                 if (ret < 0)
1079                         return ret;
1080                 val->intval = ret;
1081                 break;
1082
1083         case POWER_SUPPLY_PROP_CHARGE_TYPE:
1084                 if (!smb347_is_ps_online(smb))
1085                         return -ENODATA;
1086
1087                 /*
1088                  * We handle trickle and pre-charging the same, and taper
1089                  * and none the same.
1090                  */
1091                 switch (smb347_charging_status(smb)) {
1092                 case 1:
1093                         val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
1094                         break;
1095                 case 2:
1096                         val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST;
1097                         break;
1098                 default:
1099                         val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
1100                         break;
1101                 }
1102                 break;
1103
1104         case POWER_SUPPLY_PROP_TECHNOLOGY:
1105                 val->intval = pdata->battery_info.technology;
1106                 break;
1107
1108         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
1109                 val->intval = pdata->battery_info.voltage_min_design;
1110                 break;
1111
1112         case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
1113                 val->intval = pdata->battery_info.voltage_max_design;
1114                 break;
1115
1116         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
1117                 val->intval = pdata->battery_info.charge_full_design;
1118                 break;
1119
1120         case POWER_SUPPLY_PROP_MODEL_NAME:
1121                 val->strval = pdata->battery_info.name;
1122                 break;
1123
1124         default:
1125                 return -EINVAL;
1126         }
1127
1128         return 0;
1129 }
1130
1131 static enum power_supply_property smb347_battery_properties[] = {
1132         POWER_SUPPLY_PROP_STATUS,
1133         POWER_SUPPLY_PROP_CHARGE_TYPE,
1134         POWER_SUPPLY_PROP_TECHNOLOGY,
1135         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
1136         POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
1137         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
1138         POWER_SUPPLY_PROP_MODEL_NAME,
1139 };
1140
1141 static bool smb347_volatile_reg(struct device *dev, unsigned int reg)
1142 {
1143         switch (reg) {
1144         case IRQSTAT_A:
1145         case IRQSTAT_C:
1146         case IRQSTAT_E:
1147         case IRQSTAT_F:
1148         case STAT_A:
1149         case STAT_B:
1150         case STAT_C:
1151         case STAT_E:
1152                 return true;
1153         }
1154
1155         return false;
1156 }
1157
1158 static bool smb347_readable_reg(struct device *dev, unsigned int reg)
1159 {
1160         switch (reg) {
1161         case CFG_CHARGE_CURRENT:
1162         case CFG_CURRENT_LIMIT:
1163         case CFG_FLOAT_VOLTAGE:
1164         case CFG_STAT:
1165         case CFG_PIN:
1166         case CFG_THERM:
1167         case CFG_SYSOK:
1168         case CFG_OTHER:
1169         case CFG_OTG:
1170         case CFG_TEMP_LIMIT:
1171         case CFG_FAULT_IRQ:
1172         case CFG_STATUS_IRQ:
1173         case CFG_ADDRESS:
1174         case CMD_A:
1175         case CMD_B:
1176         case CMD_C:
1177                 return true;
1178         }
1179
1180         return smb347_volatile_reg(dev, reg);
1181 }
1182
1183 static const struct regmap_config smb347_regmap = {
1184         .reg_bits       = 8,
1185         .val_bits       = 8,
1186         .max_register   = SMB347_MAX_REGISTER,
1187         .volatile_reg   = smb347_volatile_reg,
1188         .readable_reg   = smb347_readable_reg,
1189 };
1190
1191 static int smb347_probe(struct i2c_client *client,
1192                         const struct i2c_device_id *id)
1193 {
1194         static char *battery[] = { "smb347-battery" };
1195         const struct smb347_charger_platform_data *pdata;
1196         struct device *dev = &client->dev;
1197         struct smb347_charger *smb;
1198         int ret;
1199
1200         pdata = dev->platform_data;
1201         if (!pdata)
1202                 return -EINVAL;
1203
1204         if (!pdata->use_mains && !pdata->use_usb)
1205                 return -EINVAL;
1206
1207         smb = devm_kzalloc(dev, sizeof(*smb), GFP_KERNEL);
1208         if (!smb)
1209                 return -ENOMEM;
1210
1211         i2c_set_clientdata(client, smb);
1212
1213         mutex_init(&smb->lock);
1214         smb->dev = &client->dev;
1215         smb->pdata = pdata;
1216
1217         smb->regmap = devm_regmap_init_i2c(client, &smb347_regmap);
1218         if (IS_ERR(smb->regmap))
1219                 return PTR_ERR(smb->regmap);
1220
1221         ret = smb347_hw_init(smb);
1222         if (ret < 0)
1223                 return ret;
1224
1225         if (smb->pdata->use_mains) {
1226                 smb->mains.name = "smb347-mains";
1227                 smb->mains.type = POWER_SUPPLY_TYPE_MAINS;
1228                 smb->mains.get_property = smb347_mains_get_property;
1229                 smb->mains.properties = smb347_mains_properties;
1230                 smb->mains.num_properties = ARRAY_SIZE(smb347_mains_properties);
1231                 smb->mains.supplied_to = battery;
1232                 smb->mains.num_supplicants = ARRAY_SIZE(battery);
1233                 ret = power_supply_register(dev, &smb->mains);
1234                 if (ret < 0)
1235                         return ret;
1236         }
1237
1238         if (smb->pdata->use_usb) {
1239                 smb->usb.name = "smb347-usb";
1240                 smb->usb.type = POWER_SUPPLY_TYPE_USB;
1241                 smb->usb.get_property = smb347_usb_get_property;
1242                 smb->usb.properties = smb347_usb_properties;
1243                 smb->usb.num_properties = ARRAY_SIZE(smb347_usb_properties);
1244                 smb->usb.supplied_to = battery;
1245                 smb->usb.num_supplicants = ARRAY_SIZE(battery);
1246                 ret = power_supply_register(dev, &smb->usb);
1247                 if (ret < 0) {
1248                         if (smb->pdata->use_mains)
1249                                 power_supply_unregister(&smb->mains);
1250                         return ret;
1251                 }
1252         }
1253
1254         smb->battery.name = "smb347-battery";
1255         smb->battery.type = POWER_SUPPLY_TYPE_BATTERY;
1256         smb->battery.get_property = smb347_battery_get_property;
1257         smb->battery.properties = smb347_battery_properties;
1258         smb->battery.num_properties = ARRAY_SIZE(smb347_battery_properties);
1259
1260
1261         ret = power_supply_register(dev, &smb->battery);
1262         if (ret < 0) {
1263                 if (smb->pdata->use_usb)
1264                         power_supply_unregister(&smb->usb);
1265                 if (smb->pdata->use_mains)
1266                         power_supply_unregister(&smb->mains);
1267                 return ret;
1268         }
1269
1270         /*
1271          * Interrupt pin is optional. If it is connected, we setup the
1272          * interrupt support here.
1273          */
1274         if (pdata->irq_gpio >= 0) {
1275                 ret = smb347_irq_init(smb, client);
1276                 if (ret < 0) {
1277                         dev_warn(dev, "failed to initialize IRQ: %d\n", ret);
1278                         dev_warn(dev, "disabling IRQ support\n");
1279                 } else {
1280                         smb347_irq_enable(smb);
1281                 }
1282         }
1283
1284         return 0;
1285 }
1286
1287 static int smb347_remove(struct i2c_client *client)
1288 {
1289         struct smb347_charger *smb = i2c_get_clientdata(client);
1290
1291         if (client->irq) {
1292                 smb347_irq_disable(smb);
1293                 free_irq(client->irq, smb);
1294                 gpio_free(smb->pdata->irq_gpio);
1295         }
1296
1297         power_supply_unregister(&smb->battery);
1298         if (smb->pdata->use_usb)
1299                 power_supply_unregister(&smb->usb);
1300         if (smb->pdata->use_mains)
1301                 power_supply_unregister(&smb->mains);
1302         return 0;
1303 }
1304
1305 static const struct i2c_device_id smb347_id[] = {
1306         { "smb347", 0 },
1307         { }
1308 };
1309 MODULE_DEVICE_TABLE(i2c, smb347_id);
1310
1311 static struct i2c_driver smb347_driver = {
1312         .driver = {
1313                 .name = "smb347",
1314         },
1315         .probe        = smb347_probe,
1316         .remove       = smb347_remove,
1317         .id_table     = smb347_id,
1318 };
1319
1320 module_i2c_driver(smb347_driver);
1321
1322 MODULE_AUTHOR("Bruce E. Robertson <bruce.e.robertson@intel.com>");
1323 MODULE_AUTHOR("Mika Westerberg <mika.westerberg@linux.intel.com>");
1324 MODULE_DESCRIPTION("SMB347 battery charger driver");
1325 MODULE_LICENSE("GPL");
1326 MODULE_ALIAS("i2c:smb347");