drivers/power/max14577_charger.c

   1 /*
   2  * max14577_charger.c - Battery charger driver for the Maxim 14577/77836
   3  *
   4  * Copyright (C) 2013,2014 Samsung Electronics
   5  * Krzysztof Kozlowski <k.kozlowski@samsung.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  */
  17
  18 #include <linux/module.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/power_supply.h>
  21 #include <linux/mfd/max14577-private.h>
  22 #include <linux/mfd/max14577.h>
  23
  24 struct max14577_charger {
  25         struct device *dev;
  26         struct max14577 *max14577;
  27         struct power_supply     charger;
  28
  29         unsigned int            charging_state;
  30         unsigned int            battery_state;
  31
  32         struct max14577_charger_platform_data   *pdata;
  33 };
  34
  35 /*
  36  * Helper function for mapping values of STATUS2/CHGTYP register on max14577
  37  * and max77836 chipsets to enum maxim_muic_charger_type.
  38  */
  39 static enum max14577_muic_charger_type maxim_get_charger_type(
  40                 enum maxim_device_type dev_type, u8 val) {
  41         switch (val) {
  42         case MAX14577_CHARGER_TYPE_NONE:
  43         case MAX14577_CHARGER_TYPE_USB:
  44         case MAX14577_CHARGER_TYPE_DOWNSTREAM_PORT:
  45         case MAX14577_CHARGER_TYPE_DEDICATED_CHG:
  46         case MAX14577_CHARGER_TYPE_SPECIAL_500MA:
  47         case MAX14577_CHARGER_TYPE_SPECIAL_1A:
  48                 return val;
  49         case MAX14577_CHARGER_TYPE_DEAD_BATTERY:
  50         case MAX14577_CHARGER_TYPE_RESERVED:
  51                 if (dev_type == MAXIM_DEVICE_TYPE_MAX77836)
  52                         val |= 0x8;
  53                 return val;
  54         default:
  55                 WARN_ONCE(1, "max14577: Unsupported chgtyp register value 0x%02x", val);
  56                 return val;
  57         }
  58 }
  59
  60 static int max14577_get_charger_state(struct max14577_charger *chg)
  61 {
  62         struct regmap *rmap = chg->max14577->regmap;
  63         int state = POWER_SUPPLY_STATUS_DISCHARGING;
  64         u8 reg_data;
  65
  66         /*
  67          * Charging occurs only if:
  68          *  - CHGCTRL2/MBCHOSTEN == 1
  69          *  - STATUS2/CGMBC == 1
  70          *
  71          * TODO:
  72          *  - handle FULL after Top-off timer (EOC register may be off
  73          *    and the charger won't be charging although MBCHOSTEN is on)
  74          *  - handle properly dead-battery charging (respect timer)
  75          *  - handle timers (fast-charge and prequal) /MBCCHGERR/
  76          */
  77         max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL2, &reg_data);
  78         if ((reg_data & CHGCTRL2_MBCHOSTEN_MASK) == 0)
  79                 goto state_set;
  80
  81         max14577_read_reg(rmap, MAX14577_CHG_REG_STATUS3, &reg_data);
  82         if (reg_data & STATUS3_CGMBC_MASK) {
  83                 /* Charger or USB-cable is connected */
  84                 if (reg_data & STATUS3_EOC_MASK)
  85                         state = POWER_SUPPLY_STATUS_FULL;
  86                 else
  87                         state = POWER_SUPPLY_STATUS_CHARGING;
  88                 goto state_set;
  89         }
  90
  91 state_set:
  92         chg->charging_state = state;
  93         return state;
  94 }
  95
  96 /*
  97  * Supported charge types:
  98  *  - POWER_SUPPLY_CHARGE_TYPE_NONE
  99  *  - POWER_SUPPLY_CHARGE_TYPE_FAST
 100  */
 101 static int max14577_get_charge_type(struct max14577_charger *chg)
 102 {
 103         /*
 104          * TODO: CHARGE_TYPE_TRICKLE (VCHGR_RC or EOC)?
 105          * As spec says:
 106          * [after reaching EOC interrupt]
 107          * "When the battery is fully charged, the 30-minute (typ)
 108          *  top-off timer starts. The device continues to trickle
 109          *  charge the battery until the top-off timer runs out."
 110          */
 111         if (max14577_get_charger_state(chg) == POWER_SUPPLY_STATUS_CHARGING)
 112                 return POWER_SUPPLY_CHARGE_TYPE_FAST;
 113         return POWER_SUPPLY_CHARGE_TYPE_NONE;
 114 }
 115
 116 static int max14577_get_online(struct max14577_charger *chg)
 117 {
 118         struct regmap *rmap = chg->max14577->regmap;
 119         u8 reg_data;
 120         enum max14577_muic_charger_type chg_type;
 121
 122         max14577_read_reg(rmap, MAX14577_MUIC_REG_STATUS2, &reg_data);
 123         reg_data = ((reg_data & STATUS2_CHGTYP_MASK) >> STATUS2_CHGTYP_SHIFT);
 124         chg_type = maxim_get_charger_type(chg->max14577->dev_type, reg_data);
 125         switch (chg_type) {
 126         case MAX14577_CHARGER_TYPE_USB:
 127         case MAX14577_CHARGER_TYPE_DEDICATED_CHG:
 128         case MAX14577_CHARGER_TYPE_SPECIAL_500MA:
 129         case MAX14577_CHARGER_TYPE_SPECIAL_1A:
 130         case MAX14577_CHARGER_TYPE_DEAD_BATTERY:
 131         case MAX77836_CHARGER_TYPE_SPECIAL_BIAS:
 132                 return 1;
 133         case MAX14577_CHARGER_TYPE_NONE:
 134         case MAX14577_CHARGER_TYPE_DOWNSTREAM_PORT:
 135         case MAX14577_CHARGER_TYPE_RESERVED:
 136         case MAX77836_CHARGER_TYPE_RESERVED:
 137         default:
 138                 return 0;
 139         }
 140 }
 141
 142 /*
 143  * Supported health statuses:
 144  *  - POWER_SUPPLY_HEALTH_DEAD
 145  *  - POWER_SUPPLY_HEALTH_OVERVOLTAGE
 146  *  - POWER_SUPPLY_HEALTH_GOOD
 147  */
 148 static int max14577_get_battery_health(struct max14577_charger *chg)
 149 {
 150         struct regmap *rmap = chg->max14577->regmap;
 151         int state = POWER_SUPPLY_HEALTH_GOOD;
 152         u8 reg_data;
 153         enum max14577_muic_charger_type chg_type;
 154
 155         max14577_read_reg(rmap, MAX14577_MUIC_REG_STATUS2, &reg_data);
 156         reg_data = ((reg_data & STATUS2_CHGTYP_MASK) >> STATUS2_CHGTYP_SHIFT);
 157         chg_type = maxim_get_charger_type(chg->max14577->dev_type, reg_data);
 158         if (chg_type == MAX14577_CHARGER_TYPE_DEAD_BATTERY) {
 159                 state = POWER_SUPPLY_HEALTH_DEAD;
 160                 goto state_set;
 161         }
 162
 163         max14577_read_reg(rmap, MAX14577_CHG_REG_STATUS3, &reg_data);
 164         if (reg_data & STATUS3_OVP_MASK) {
 165                 state = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
 166                 goto state_set;
 167         }
 168
 169 state_set:
 170         chg->battery_state = state;
 171         return state;
 172 }
 173
 174 /*
 175  * Always returns 1.
 176  * The max14577 chip doesn't report any status of battery presence.
 177  * Lets assume that it will always be used with some battery.
 178  */
 179 static int max14577_get_present(struct max14577_charger *chg)
 180 {
 181         return 1;
 182 }
 183
 184 static int max14577_set_fast_charge_timer(struct max14577_charger *chg,
 185                 unsigned long hours)
 186 {
 187         u8 reg_data;
 188
 189         switch (hours) {
 190         case 5 ... 7:
 191                 reg_data = hours - 3;
 192                 break;
 193         case 0:
 194                 /* Disable */
 195                 reg_data = 0x7;
 196                 break;
 197         default:
 198                 dev_err(chg->dev, "Wrong value for Fast-Charge Timer: %lu\n",
 199                                 hours);
 200                 return -EINVAL;
 201         }
 202         reg_data <<= CHGCTRL1_TCHW_SHIFT;
 203
 204         return max14577_update_reg(chg->max14577->regmap,
 205                         MAX14577_REG_CHGCTRL1, CHGCTRL1_TCHW_MASK, reg_data);
 206 }
 207
 208 static int max14577_init_constant_voltage(struct max14577_charger *chg,
 209                 unsigned int uvolt)
 210 {
 211         u8 reg_data;
 212
 213         if (uvolt < MAXIM_CHARGER_CONSTANT_VOLTAGE_MIN ||
 214                         uvolt > MAXIM_CHARGER_CONSTANT_VOLTAGE_MAX)
 215                 return -EINVAL;
 216
 217         if (uvolt == 4200000)
 218                 reg_data = 0x0;
 219         else if (uvolt == MAXIM_CHARGER_CONSTANT_VOLTAGE_MAX)
 220                 reg_data = 0x1f;
 221         else if (uvolt <= 4280000) {
 222                 unsigned int val = uvolt;
 223
 224                 val -= MAXIM_CHARGER_CONSTANT_VOLTAGE_MIN;
 225                 val /= MAXIM_CHARGER_CONSTANT_VOLTAGE_STEP;
 226                 if (uvolt <= 4180000)
 227                         reg_data = 0x1 + val;
 228                 else
 229                         reg_data = val; /* Fix for gap between 4.18V and 4.22V */
 230         } else
 231                 return -EINVAL;
 232
 233         reg_data <<= CHGCTRL3_MBCCVWRC_SHIFT;
 234
 235         return max14577_write_reg(chg->max14577->regmap,
 236                         MAX14577_CHG_REG_CHG_CTRL3, reg_data);
 237 }
 238
 239 static int max14577_init_eoc(struct max14577_charger *chg,
 240                 unsigned int uamp)
 241 {
 242         unsigned int current_bits = 0xf;
 243         u8 reg_data;
 244
 245         switch (chg->max14577->dev_type) {
 246         case MAXIM_DEVICE_TYPE_MAX77836:
 247                 if (uamp < 5000)
 248                         return -EINVAL; /* Requested current is too low */
 249
 250                 if (uamp >= 7500 && uamp < 10000)
 251                         current_bits = 0x0;
 252                 else if (uamp <= 50000) {
 253                         /* <5000, 7499> and <10000, 50000> */
 254                         current_bits = uamp / 5000;
 255                 } else {
 256                         uamp = min(uamp, 100000U) - 50000U;
 257                         current_bits = 0xa + uamp / 10000;
 258                 }
 259                 break;
 260
 261         case MAXIM_DEVICE_TYPE_MAX14577:
 262         default:
 263                 if (uamp < MAX14577_CHARGER_EOC_CURRENT_LIMIT_MIN)
 264                         return -EINVAL; /* Requested current is too low */
 265
 266                 uamp = min(uamp, MAX14577_CHARGER_EOC_CURRENT_LIMIT_MAX);
 267                 uamp -= MAX14577_CHARGER_EOC_CURRENT_LIMIT_MIN;
 268                 current_bits = uamp / MAX14577_CHARGER_EOC_CURRENT_LIMIT_STEP;
 269                 break;
 270         }
 271
 272         reg_data = current_bits << CHGCTRL5_EOCS_SHIFT;
 273
 274         return max14577_update_reg(chg->max14577->regmap,
 275                         MAX14577_CHG_REG_CHG_CTRL5, CHGCTRL5_EOCS_MASK,
 276                         reg_data);
 277 }
 278
 279 static int max14577_init_fast_charge(struct max14577_charger *chg,
 280                 unsigned int uamp)
 281 {
 282         u8 reg_data;
 283         int ret;
 284         const struct maxim_charger_current *limits =
 285                 &maxim_charger_currents[chg->max14577->dev_type];
 286
 287         ret = maxim_charger_calc_reg_current(limits, uamp, uamp, &reg_data);
 288         if (ret) {
 289                 dev_err(chg->dev, "Wrong value for fast charge: %u\n", uamp);
 290                 return ret;
 291         }
 292
 293         return max14577_update_reg(chg->max14577->regmap,
 294                         MAX14577_CHG_REG_CHG_CTRL4,
 295                         CHGCTRL4_MBCICHWRCL_MASK | CHGCTRL4_MBCICHWRCH_MASK,
 296                         reg_data);
 297 }
 298
 299 /*
 300  * Sets charger registers to proper and safe default values.
 301  * Some of these values are equal to defaults in MAX14577E
 302  * data sheet but there are minor differences.
 303  */
 304 static int max14577_charger_reg_init(struct max14577_charger *chg)
 305 {
 306         struct regmap *rmap = chg->max14577->regmap;
 307         u8 reg_data;
 308         int ret;
 309
 310         /*
 311          * Charger-Type Manual Detection, default off (set CHGTYPMAN to 0)
 312          * Charger-Detection Enable, default on (set CHGDETEN to 1)
 313          * Combined mask of CHGDETEN and CHGTYPMAN will zero the CHGTYPMAN bit
 314          */
 315         reg_data = 0x1 << CDETCTRL1_CHGDETEN_SHIFT;
 316         max14577_update_reg(rmap, MAX14577_REG_CDETCTRL1,
 317                         CDETCTRL1_CHGDETEN_MASK | CDETCTRL1_CHGTYPMAN_MASK,
 318                         reg_data);
 319
 320         /*
 321          * Wall-Adapter Rapid Charge, default on
 322          * Battery-Charger, default on
 323          */
 324         reg_data = 0x1 << CHGCTRL2_VCHGR_RC_SHIFT;
 325         reg_data |= 0x1 << CHGCTRL2_MBCHOSTEN_SHIFT;
 326         max14577_write_reg(rmap, MAX14577_REG_CHGCTRL2, reg_data);
 327
 328         /* Auto Charging Stop, default off */
 329         reg_data = 0x0 << CHGCTRL6_AUTOSTOP_SHIFT;
 330         max14577_write_reg(rmap, MAX14577_REG_CHGCTRL6, reg_data);
 331
 332         ret = max14577_init_constant_voltage(chg, chg->pdata->constant_uvolt);
 333         if (ret)
 334                 return ret;
 335
 336         ret = max14577_init_eoc(chg, chg->pdata->eoc_uamp);
 337         if (ret)
 338                 return ret;
 339
 340         ret = max14577_init_fast_charge(chg, chg->pdata->fast_charge_uamp);
 341         if (ret)
 342                 return ret;
 343
 344         ret = max14577_set_fast_charge_timer(chg,
 345                         MAXIM_CHARGER_FAST_CHARGE_TIMER_DEFAULT);
 346         if (ret)
 347                 return ret;
 348
 349         /* Initialize Overvoltage-Protection Threshold */
 350         switch (chg->pdata->ovp_uvolt) {
 351         case 7500000:
 352                 reg_data = 0x0;
 353                 break;
 354         case 6000000:
 355         case 6500000:
 356         case 7000000:
 357                 reg_data = 0x1 + (chg->pdata->ovp_uvolt - 6000000) / 500000;
 358                 break;
 359         default:
 360                 dev_err(chg->dev, "Wrong value for OVP: %u\n",
 361                                 chg->pdata->ovp_uvolt);
 362                 return -EINVAL;
 363         }
 364         reg_data <<= CHGCTRL7_OTPCGHCVS_SHIFT;
 365         max14577_write_reg(rmap, MAX14577_REG_CHGCTRL7, reg_data);
 366
 367         return 0;
 368 }
 369
 370 /* Support property from charger */
 371 static enum power_supply_property max14577_charger_props[] = {
 372         POWER_SUPPLY_PROP_STATUS,
 373         POWER_SUPPLY_PROP_CHARGE_TYPE,
 374         POWER_SUPPLY_PROP_HEALTH,
 375         POWER_SUPPLY_PROP_PRESENT,
 376         POWER_SUPPLY_PROP_ONLINE,
 377         POWER_SUPPLY_PROP_MODEL_NAME,
 378         POWER_SUPPLY_PROP_MANUFACTURER,
 379 };
 380
 381 static const char * const model_names[] = {
 382         [MAXIM_DEVICE_TYPE_UNKNOWN]     = "MAX14577-like",
 383         [MAXIM_DEVICE_TYPE_MAX14577]    = "MAX14577",
 384         [MAXIM_DEVICE_TYPE_MAX77836]    = "MAX77836",
 385 };
 386 static const char *manufacturer = "Maxim Integrated";
 387
 388 static int max14577_charger_get_property(struct power_supply *psy,
 389                             enum power_supply_property psp,
 390                             union power_supply_propval *val)
 391 {
 392         struct max14577_charger *chg = container_of(psy,
 393                                                   struct max14577_charger,
 394                                                   charger);
 395         int ret = 0;
 396
 397         switch (psp) {
 398         case POWER_SUPPLY_PROP_STATUS:
 399                 val->intval = max14577_get_charger_state(chg);
 400                 break;
 401         case POWER_SUPPLY_PROP_CHARGE_TYPE:
 402                 val->intval = max14577_get_charge_type(chg);
 403                 break;
 404         case POWER_SUPPLY_PROP_HEALTH:
 405                 val->intval = max14577_get_battery_health(chg);
 406                 break;
 407         case POWER_SUPPLY_PROP_PRESENT:
 408                 val->intval = max14577_get_present(chg);
 409                 break;
 410         case POWER_SUPPLY_PROP_ONLINE:
 411                 val->intval = max14577_get_online(chg);
 412                 break;
 413         case POWER_SUPPLY_PROP_MODEL_NAME:
 414                 BUILD_BUG_ON(ARRAY_SIZE(model_names) != MAXIM_DEVICE_TYPE_NUM);
 415                 val->strval = model_names[chg->max14577->dev_type];
 416                 break;
 417         case POWER_SUPPLY_PROP_MANUFACTURER:
 418                 val->strval = manufacturer;
 419                 break;
 420         default:
 421                 return -EINVAL;
 422         }
 423
 424         return ret;
 425 }
 426
 427 #ifdef CONFIG_OF
 428 static struct max14577_charger_platform_data *max14577_charger_dt_init(
 429                 struct platform_device *pdev)
 430 {
 431         struct max14577_charger_platform_data *pdata;
 432         struct device_node *np = pdev->dev.of_node;
 433         int ret;
 434
 435         if (!np) {
 436                 dev_err(&pdev->dev, "No charger OF node\n");
 437                 return ERR_PTR(-EINVAL);
 438         }
 439
 440         pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
 441         if (!pdata)
 442                 return ERR_PTR(-ENOMEM);
 443
 444         ret = of_property_read_u32(np, "maxim,constant-uvolt",
 445                         &pdata->constant_uvolt);
 446         if (ret) {
 447                 dev_err(&pdev->dev, "Cannot parse maxim,constant-uvolt field from DT\n");
 448                 return ERR_PTR(ret);
 449         }
 450
 451         ret = of_property_read_u32(np, "maxim,fast-charge-uamp",
 452                         &pdata->fast_charge_uamp);
 453         if (ret) {
 454                 dev_err(&pdev->dev, "Cannot parse maxim,fast-charge-uamp field from DT\n");
 455                 return ERR_PTR(ret);
 456         }
 457
 458         ret = of_property_read_u32(np, "maxim,eoc-uamp", &pdata->eoc_uamp);
 459         if (ret) {
 460                 dev_err(&pdev->dev, "Cannot parse maxim,eoc-uamp field from DT\n");
 461                 return ERR_PTR(ret);
 462         }
 463
 464         ret = of_property_read_u32(np, "maxim,ovp-uvolt", &pdata->ovp_uvolt);
 465         if (ret) {
 466                 dev_err(&pdev->dev, "Cannot parse maxim,ovp-uvolt field from DT\n");
 467                 return ERR_PTR(ret);
 468         }
 469
 470         return pdata;
 471 }
 472 #else /* CONFIG_OF */
 473 static struct max14577_charger_platform_data *max14577_charger_dt_init(
 474                 struct platform_device *pdev)
 475 {
 476         return NULL;
 477 }
 478 #endif /* CONFIG_OF */
 479
 480 static ssize_t show_fast_charge_timer(struct device *dev,
 481                 struct device_attribute *attr, char *buf)
 482 {
 483         struct max14577_charger *chg = dev_get_drvdata(dev);
 484         u8 reg_data;
 485         int ret;
 486         unsigned int val;
 487
 488         ret = max14577_read_reg(chg->max14577->regmap, MAX14577_REG_CHGCTRL1,
 489                         &reg_data);
 490         if (ret)
 491                 return ret;
 492
 493         reg_data &= CHGCTRL1_TCHW_MASK;
 494         reg_data >>= CHGCTRL1_TCHW_SHIFT;
 495         switch (reg_data) {
 496         case 0x2 ... 0x4:
 497                 val = reg_data + 3;
 498                 break;
 499         case 0x7:
 500                 val = 0;
 501                 break;
 502         default:
 503                 val = 5;
 504                 break;
 505         }
 506
 507         return scnprintf(buf, PAGE_SIZE, "%u\n", val);
 508 }
 509
 510 static ssize_t store_fast_charge_timer(struct device *dev,
 511                 struct device_attribute *attr, const char *buf, size_t count)
 512 {
 513         struct max14577_charger *chg = dev_get_drvdata(dev);
 514         unsigned long val;
 515         int ret;
 516
 517         ret = kstrtoul(buf, 10, &val);
 518         if (ret)
 519                 return ret;
 520
 521         ret = max14577_set_fast_charge_timer(chg, val);
 522         if (ret)
 523                 return ret;
 524
 525         return count;
 526 }
 527
 528 static DEVICE_ATTR(fast_charge_timer, S_IRUGO | S_IWUSR,
 529                 show_fast_charge_timer, store_fast_charge_timer);
 530
 531 static int max14577_charger_probe(struct platform_device *pdev)
 532 {
 533         struct max14577_charger *chg;
 534         struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent);
 535         int ret;
 536
 537         chg = devm_kzalloc(&pdev->dev, sizeof(*chg), GFP_KERNEL);
 538         if (!chg)
 539                 return -ENOMEM;
 540
 541         platform_set_drvdata(pdev, chg);
 542         chg->dev = &pdev->dev;
 543         chg->max14577 = max14577;
 544
 545         chg->pdata = max14577_charger_dt_init(pdev);
 546         if (IS_ERR_OR_NULL(chg->pdata))
 547                 return PTR_ERR(chg->pdata);
 548
 549         ret = max14577_charger_reg_init(chg);
 550         if (ret)
 551                 return ret;
 552
 553         chg->charger.name = "max14577-charger",
 554         chg->charger.type = POWER_SUPPLY_TYPE_BATTERY,
 555         chg->charger.properties = max14577_charger_props,
 556         chg->charger.num_properties = ARRAY_SIZE(max14577_charger_props),
 557         chg->charger.get_property = max14577_charger_get_property,
 558
 559         ret = device_create_file(&pdev->dev, &dev_attr_fast_charge_timer);
 560         if (ret) {
 561                 dev_err(&pdev->dev, "failed: create sysfs entry\n");
 562                 return ret;
 563         }
 564
 565         ret = power_supply_register(&pdev->dev, &chg->charger);
 566         if (ret) {
 567                 dev_err(&pdev->dev, "failed: power supply register\n");
 568                 goto err;
 569         }
 570
 571         /* Check for valid values for charger */
 572         BUILD_BUG_ON(MAX14577_CHARGER_EOC_CURRENT_LIMIT_MIN +
 573                         MAX14577_CHARGER_EOC_CURRENT_LIMIT_STEP * 0xf !=
 574                         MAX14577_CHARGER_EOC_CURRENT_LIMIT_MAX);
 575         return 0;
 576
 577 err:
 578         device_remove_file(&pdev->dev, &dev_attr_fast_charge_timer);
 579
 580         return ret;
 581 }
 582
 583 static int max14577_charger_remove(struct platform_device *pdev)
 584 {
 585         struct max14577_charger *chg = platform_get_drvdata(pdev);
 586
 587         device_remove_file(&pdev->dev, &dev_attr_fast_charge_timer);
 588         power_supply_unregister(&chg->charger);
 589
 590         return 0;
 591 }
 592
 593 static const struct platform_device_id max14577_charger_id[] = {
 594         { "max14577-charger", MAXIM_DEVICE_TYPE_MAX14577, },
 595         { "max77836-charger", MAXIM_DEVICE_TYPE_MAX77836, },
 596         { }
 597 };
 598 MODULE_DEVICE_TABLE(platform, max14577_charger_id);
 599
 600 static struct platform_driver max14577_charger_driver = {
 601         .driver = {
 602                 .name   = "max14577-charger",
 603         },
 604         .probe          = max14577_charger_probe,
 605         .remove         = max14577_charger_remove,
 606         .id_table       = max14577_charger_id,
 607 };
 608 module_platform_driver(max14577_charger_driver);
 609
 610 MODULE_AUTHOR("Krzysztof Kozlowski <k.kozlowski@samsung.com>");
 611 MODULE_DESCRIPTION("Maxim 14577/77836 charger driver");
 612 MODULE_LICENSE("GPL");