LXR linux/drivers/power/supply/max14577

   1/*
   2 * max14577_charger.c - Battery charger driver for the Maxim 14577/77836
   3 *
   4 * Copyright (C) 2013,2014 Samsung Electronics
   5 * Krzysztof Kozlowski <krzk@kernel.org>
   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
  24struct max14577_charger {
  25        struct device           *dev;
  26        struct max14577         *max14577;
  27        struct power_supply     *charger;
  28
  29        struct max14577_charger_platform_data   *pdata;
  30};
  31
  32/*
  33 * Helper function for mapping values of STATUS2/CHGTYP register on max14577
  34 * and max77836 chipsets to enum maxim_muic_charger_type.
  35 */
  36static enum max14577_muic_charger_type maxim_get_charger_type(
  37                enum maxim_device_type dev_type, u8 val) {
  38        switch (val) {
  39        case MAX14577_CHARGER_TYPE_NONE:
  40        case MAX14577_CHARGER_TYPE_USB:
  41        case MAX14577_CHARGER_TYPE_DOWNSTREAM_PORT:
  42        case MAX14577_CHARGER_TYPE_DEDICATED_CHG:
  43        case MAX14577_CHARGER_TYPE_SPECIAL_500MA:
  44        case MAX14577_CHARGER_TYPE_SPECIAL_1A:
  45                return val;
  46        case MAX14577_CHARGER_TYPE_DEAD_BATTERY:
  47        case MAX14577_CHARGER_TYPE_RESERVED:
  48                if (dev_type == MAXIM_DEVICE_TYPE_MAX77836)
  49                        val |= 0x8;
  50                return val;
  51        default:
  52                WARN_ONCE(1, "max14577: Unsupported chgtyp register value 0x%02x", val);
  53                return val;
  54        }
  55}
  56
  57static int max14577_get_charger_state(struct max14577_charger *chg, int *val)
  58{
  59        struct regmap *rmap = chg->max14577->regmap;
  60        int ret;
  61        u8 reg_data;
  62
  63        /*
  64         * Charging occurs only if:
  65         *  - CHGCTRL2/MBCHOSTEN == 1
  66         *  - STATUS2/CGMBC == 1
  67         *
  68         * TODO:
  69         *  - handle FULL after Top-off timer (EOC register may be off
  70         *    and the charger won't be charging although MBCHOSTEN is on)
  71         *  - handle properly dead-battery charging (respect timer)
  72         *  - handle timers (fast-charge and prequal) /MBCCHGERR/
  73         */
  74        ret = max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL2, &reg_data);
  75        if (ret < 0)
  76                goto out;
  77
  78        if ((reg_data & CHGCTRL2_MBCHOSTEN_MASK) == 0) {
  79                *val = POWER_SUPPLY_STATUS_DISCHARGING;
  80                goto out;
  81        }
  82
  83        ret = max14577_read_reg(rmap, MAX14577_CHG_REG_STATUS3, &reg_data);
  84        if (ret < 0)
  85                goto out;
  86
  87        if (reg_data & STATUS3_CGMBC_MASK) {
  88                /* Charger or USB-cable is connected */
  89                if (reg_data & STATUS3_EOC_MASK)
  90                        *val = POWER_SUPPLY_STATUS_FULL;
  91                else
  92                        *val = POWER_SUPPLY_STATUS_CHARGING;
  93                goto out;
  94        }
  95
  96        *val = POWER_SUPPLY_STATUS_DISCHARGING;
  97
  98out:
  99        return ret;
 100}
 101
 102/*
 103 * Supported charge types:
 104 *  - POWER_SUPPLY_CHARGE_TYPE_NONE
 105 *  - POWER_SUPPLY_CHARGE_TYPE_FAST
 106 */
 107static int max14577_get_charge_type(struct max14577_charger *chg, int *val)
 108{
 109        int ret, charging;
 110
 111        /*
 112         * TODO: CHARGE_TYPE_TRICKLE (VCHGR_RC or EOC)?
 113         * As spec says:
 114         * [after reaching EOC interrupt]
 115         * "When the battery is fully charged, the 30-minute (typ)
 116         *  top-off timer starts. The device continues to trickle
 117         *  charge the battery until the top-off timer runs out."
 118         */
 119        ret = max14577_get_charger_state(chg, &charging);
 120        if (ret < 0)
 121                return ret;
 122
 123        if (charging == POWER_SUPPLY_STATUS_CHARGING)
 124                *val = POWER_SUPPLY_CHARGE_TYPE_FAST;
 125        else
 126                *val = POWER_SUPPLY_CHARGE_TYPE_NONE;
 127
 128        return 0;
 129}
 130
 131static int max14577_get_online(struct max14577_charger *chg, int *val)
 132{
 133        struct regmap *rmap = chg->max14577->regmap;
 134        u8 reg_data;
 135        int ret;
 136        enum max14577_muic_charger_type chg_type;
 137
 138        ret = max14577_read_reg(rmap, MAX14577_MUIC_REG_STATUS2, &reg_data);
 139        if (ret < 0)
 140                return ret;
 141
 142        reg_data = ((reg_data & STATUS2_CHGTYP_MASK) >> STATUS2_CHGTYP_SHIFT);
 143        chg_type = maxim_get_charger_type(chg->max14577->dev_type, reg_data);
 144        switch (chg_type) {
 145        case MAX14577_CHARGER_TYPE_USB:
 146        case MAX14577_CHARGER_TYPE_DEDICATED_CHG:
 147        case MAX14577_CHARGER_TYPE_SPECIAL_500MA:
 148        case MAX14577_CHARGER_TYPE_SPECIAL_1A:
 149        case MAX14577_CHARGER_TYPE_DEAD_BATTERY:
 150        case MAX77836_CHARGER_TYPE_SPECIAL_BIAS:
 151                *val = 1;
 152                break;
 153        case MAX14577_CHARGER_TYPE_NONE:
 154        case MAX14577_CHARGER_TYPE_DOWNSTREAM_PORT:
 155        case MAX14577_CHARGER_TYPE_RESERVED:
 156        case MAX77836_CHARGER_TYPE_RESERVED:
 157        default:
 158                *val = 0;
 159        }
 160
 161        return 0;
 162}
 163
 164/*
 165 * Supported health statuses:
 166 *  - POWER_SUPPLY_HEALTH_DEAD
 167 *  - POWER_SUPPLY_HEALTH_OVERVOLTAGE
 168 *  - POWER_SUPPLY_HEALTH_GOOD
 169 */
 170static int max14577_get_battery_health(struct max14577_charger *chg, int *val)
 171{
 172        struct regmap *rmap = chg->max14577->regmap;
 173        int ret;
 174        u8 reg_data;
 175        enum max14577_muic_charger_type chg_type;
 176
 177        ret = max14577_read_reg(rmap, MAX14577_MUIC_REG_STATUS2, &reg_data);
 178        if (ret < 0)
 179                goto out;
 180
 181        reg_data = ((reg_data & STATUS2_CHGTYP_MASK) >> STATUS2_CHGTYP_SHIFT);
 182        chg_type = maxim_get_charger_type(chg->max14577->dev_type, reg_data);
 183        if (chg_type == MAX14577_CHARGER_TYPE_DEAD_BATTERY) {
 184                *val = POWER_SUPPLY_HEALTH_DEAD;
 185                goto out;
 186        }
 187
 188        ret = max14577_read_reg(rmap, MAX14577_CHG_REG_STATUS3, &reg_data);
 189        if (ret < 0)
 190                goto out;
 191
 192        if (reg_data & STATUS3_OVP_MASK) {
 193                *val = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
 194                goto out;
 195        }
 196
 197        /* Not dead, not overvoltage */
 198        *val = POWER_SUPPLY_HEALTH_GOOD;
 199
 200out:
 201        return ret;
 202}
 203
 204/*
 205 * Always returns 1.
 206 * The max14577 chip doesn't report any status of battery presence.
 207 * Lets assume that it will always be used with some battery.
 208 */
 209static int max14577_get_present(struct max14577_charger *chg, int *val)
 210{
 211        *val = 1;
 212
 213        return 0;
 214}
 215
 216static int max14577_set_fast_charge_timer(struct max14577_charger *chg,
 217                unsigned long hours)
 218{
 219        u8 reg_data;
 220
 221        switch (hours) {
 222        case 5 ... 7:
 223                reg_data = hours - 3;
 224                break;
 225        case 0:
 226                /* Disable */
 227                reg_data = 0x7;
 228                break;
 229        default:
 230                dev_err(chg->dev, "Wrong value for Fast-Charge Timer: %lu\n",
 231                                hours);
 232                return -EINVAL;
 233        }
 234        reg_data <<= CHGCTRL1_TCHW_SHIFT;
 235
 236        return max14577_update_reg(chg->max14577->regmap,
 237                        MAX14577_REG_CHGCTRL1, CHGCTRL1_TCHW_MASK, reg_data);
 238}
 239
 240static int max14577_init_constant_voltage(struct max14577_charger *chg,
 241                unsigned int uvolt)
 242{
 243        u8 reg_data;
 244
 245        if (uvolt < MAXIM_CHARGER_CONSTANT_VOLTAGE_MIN ||
 246                        uvolt > MAXIM_CHARGER_CONSTANT_VOLTAGE_MAX)
 247                return -EINVAL;
 248
 249        if (uvolt == 4200000)
 250                reg_data = 0x0;
 251        else if (uvolt == MAXIM_CHARGER_CONSTANT_VOLTAGE_MAX)
 252                reg_data = 0x1f;
 253        else if (uvolt <= 4280000) {
 254                unsigned int val = uvolt;
 255
 256                val -= MAXIM_CHARGER_CONSTANT_VOLTAGE_MIN;
 257                val /= MAXIM_CHARGER_CONSTANT_VOLTAGE_STEP;
 258                if (uvolt <= 4180000)
 259                        reg_data = 0x1 + val;
 260                else
 261                        reg_data = val; /* Fix for gap between 4.18V and 4.22V */
 262        } else
 263                return -EINVAL;
 264
 265        reg_data <<= CHGCTRL3_MBCCVWRC_SHIFT;
 266
 267        return max14577_write_reg(chg->max14577->regmap,
 268                        MAX14577_CHG_REG_CHG_CTRL3, reg_data);
 269}
 270
 271static int max14577_init_eoc(struct max14577_charger *chg,
 272                unsigned int uamp)
 273{
 274        unsigned int current_bits = 0xf;
 275        u8 reg_data;
 276
 277        switch (chg->max14577->dev_type) {
 278        case MAXIM_DEVICE_TYPE_MAX77836:
 279                if (uamp < 5000)
 280                        return -EINVAL; /* Requested current is too low */
 281
 282                if (uamp >= 7500 && uamp < 10000)
 283                        current_bits = 0x0;
 284                else if (uamp <= 50000) {
 285                        /* <5000, 7499> and <10000, 50000> */
 286                        current_bits = uamp / 5000;
 287                } else {
 288                        uamp = min(uamp, 100000U) - 50000U;
 289                        current_bits = 0xa + uamp / 10000;
 290                }
 291                break;
 292
 293        case MAXIM_DEVICE_TYPE_MAX14577:
 294        default:
 295                if (uamp < MAX14577_CHARGER_EOC_CURRENT_LIMIT_MIN)
 296                        return -EINVAL; /* Requested current is too low */
 297
 298                uamp = min(uamp, MAX14577_CHARGER_EOC_CURRENT_LIMIT_MAX);
 299                uamp -= MAX14577_CHARGER_EOC_CURRENT_LIMIT_MIN;
 300                current_bits = uamp / MAX14577_CHARGER_EOC_CURRENT_LIMIT_STEP;
 301                break;
 302        }
 303
 304        reg_data = current_bits << CHGCTRL5_EOCS_SHIFT;
 305
 306        return max14577_update_reg(chg->max14577->regmap,
 307                        MAX14577_CHG_REG_CHG_CTRL5, CHGCTRL5_EOCS_MASK,
 308                        reg_data);
 309}
 310
 311static int max14577_init_fast_charge(struct max14577_charger *chg,
 312                unsigned int uamp)
 313{
 314        u8 reg_data;
 315        int ret;
 316        const struct maxim_charger_current *limits =
 317                &maxim_charger_currents[chg->max14577->dev_type];
 318
 319        ret = maxim_charger_calc_reg_current(limits, uamp, uamp, &reg_data);
 320        if (ret) {
 321                dev_err(chg->dev, "Wrong value for fast charge: %u\n", uamp);
 322                return ret;
 323        }
 324
 325        return max14577_update_reg(chg->max14577->regmap,
 326                        MAX14577_CHG_REG_CHG_CTRL4,
 327                        CHGCTRL4_MBCICHWRCL_MASK | CHGCTRL4_MBCICHWRCH_MASK,
 328                        reg_data);
 329}
 330
 331/*
 332 * Sets charger registers to proper and safe default values.
 333 * Some of these values are equal to defaults in MAX14577E
 334 * data sheet but there are minor differences.
 335 */
 336static int max14577_charger_reg_init(struct max14577_charger *chg)
 337{
 338        struct regmap *rmap = chg->max14577->regmap;
 339        u8 reg_data;
 340        int ret;
 341
 342        /*
 343         * Charger-Type Manual Detection, default off (set CHGTYPMAN to 0)
 344         * Charger-Detection Enable, default on (set CHGDETEN to 1)
 345         * Combined mask of CHGDETEN and CHGTYPMAN will zero the CHGTYPMAN bit
 346         */
 347        reg_data = 0x1 << CDETCTRL1_CHGDETEN_SHIFT;
 348        max14577_update_reg(rmap, MAX14577_REG_CDETCTRL1,
 349                        CDETCTRL1_CHGDETEN_MASK | CDETCTRL1_CHGTYPMAN_MASK,
 350                        reg_data);
 351
 352        /*
 353         * Wall-Adapter Rapid Charge, default on
 354         * Battery-Charger, default on
 355         */
 356        reg_data = 0x1 << CHGCTRL2_VCHGR_RC_SHIFT;
 357        reg_data |= 0x1 << CHGCTRL2_MBCHOSTEN_SHIFT;
 358        max14577_write_reg(rmap, MAX14577_REG_CHGCTRL2, reg_data);
 359
 360        /* Auto Charging Stop, default off */
 361        reg_data = 0x0 << CHGCTRL6_AUTOSTOP_SHIFT;
 362        max14577_write_reg(rmap, MAX14577_REG_CHGCTRL6, reg_data);
 363
 364        ret = max14577_init_constant_voltage(chg, chg->pdata->constant_uvolt);
 365        if (ret)
 366                return ret;
 367
 368        ret = max14577_init_eoc(chg, chg->pdata->eoc_uamp);
 369        if (ret)
 370                return ret;
 371
 372        ret = max14577_init_fast_charge(chg, chg->pdata->fast_charge_uamp);
 373        if (ret)
 374                return ret;
 375
 376        ret = max14577_set_fast_charge_timer(chg,
 377                        MAXIM_CHARGER_FAST_CHARGE_TIMER_DEFAULT);
 378        if (ret)
 379                return ret;
 380
 381        /* Initialize Overvoltage-Protection Threshold */
 382        switch (chg->pdata->ovp_uvolt) {
 383        case 7500000:
 384                reg_data = 0x0;
 385                break;
 386        case 6000000:
 387        case 6500000:
 388        case 7000000:
 389                reg_data = 0x1 + (chg->pdata->ovp_uvolt - 6000000) / 500000;
 390                break;
 391        default:
 392                dev_err(chg->dev, "Wrong value for OVP: %u\n",
 393                                chg->pdata->ovp_uvolt);
 394                return -EINVAL;
 395        }
 396        reg_data <<= CHGCTRL7_OTPCGHCVS_SHIFT;
 397        max14577_write_reg(rmap, MAX14577_REG_CHGCTRL7, reg_data);
 398
 399        return 0;
 400}
 401
 402/* Support property from charger */
 403static enum power_supply_property max14577_charger_props[] = {
 404        POWER_SUPPLY_PROP_STATUS,
 405        POWER_SUPPLY_PROP_CHARGE_TYPE,
 406        POWER_SUPPLY_PROP_HEALTH,
 407        POWER_SUPPLY_PROP_PRESENT,
 408        POWER_SUPPLY_PROP_ONLINE,
 409        POWER_SUPPLY_PROP_MODEL_NAME,
 410        POWER_SUPPLY_PROP_MANUFACTURER,
 411};
 412
 413static const char * const model_names[] = {
 414        [MAXIM_DEVICE_TYPE_UNKNOWN]     = "MAX14577-like",
 415        [MAXIM_DEVICE_TYPE_MAX14577]    = "MAX14577",
 416        [MAXIM_DEVICE_TYPE_MAX77836]    = "MAX77836",
 417};
 418static const char *manufacturer = "Maxim Integrated";
 419
 420static int max14577_charger_get_property(struct power_supply *psy,
 421                            enum power_supply_property psp,
 422                            union power_supply_propval *val)
 423{
 424        struct max14577_charger *chg = power_supply_get_drvdata(psy);
 425        int ret = 0;
 426
 427        switch (psp) {
 428        case POWER_SUPPLY_PROP_STATUS:
 429                ret = max14577_get_charger_state(chg, &val->intval);
 430                break;
 431        case POWER_SUPPLY_PROP_CHARGE_TYPE:
 432                ret = max14577_get_charge_type(chg, &val->intval);
 433                break;
 434        case POWER_SUPPLY_PROP_HEALTH:
 435                ret = max14577_get_battery_health(chg, &val->intval);
 436                break;
 437        case POWER_SUPPLY_PROP_PRESENT:
 438                ret = max14577_get_present(chg, &val->intval);
 439                break;
 440        case POWER_SUPPLY_PROP_ONLINE:
 441                ret = max14577_get_online(chg, &val->intval);
 442                break;
 443        case POWER_SUPPLY_PROP_MODEL_NAME:
 444                BUILD_BUG_ON(ARRAY_SIZE(model_names) != MAXIM_DEVICE_TYPE_NUM);
 445                val->strval = model_names[chg->max14577->dev_type];
 446                break;
 447        case POWER_SUPPLY_PROP_MANUFACTURER:
 448                val->strval = manufacturer;
 449                break;
 450        default:
 451                return -EINVAL;
 452        }
 453
 454        return ret;
 455}
 456
 457static const struct power_supply_desc max14577_charger_desc = {
 458        .name = "max14577-charger",
 459        .type = POWER_SUPPLY_TYPE_BATTERY,
 460        .properties = max14577_charger_props,
 461        .num_properties = ARRAY_SIZE(max14577_charger_props),
 462        .get_property = max14577_charger_get_property,
 463};
 464
 465#ifdef CONFIG_OF
 466static struct max14577_charger_platform_data *max14577_charger_dt_init(
 467                struct platform_device *pdev)
 468{
 469        struct max14577_charger_platform_data *pdata;
 470        struct device_node *np = pdev->dev.of_node;
 471        int ret;
 472
 473        if (!np) {
 474                dev_err(&pdev->dev, "No charger OF node\n");
 475                return ERR_PTR(-EINVAL);
 476        }
 477
 478        pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
 479        if (!pdata)
 480                return ERR_PTR(-ENOMEM);
 481
 482        ret = of_property_read_u32(np, "maxim,constant-uvolt",
 483                        &pdata->constant_uvolt);
 484        if (ret) {
 485                dev_err(&pdev->dev, "Cannot parse maxim,constant-uvolt field from DT\n");
 486                return ERR_PTR(ret);
 487        }
 488
 489        ret = of_property_read_u32(np, "maxim,fast-charge-uamp",
 490                        &pdata->fast_charge_uamp);
 491        if (ret) {
 492                dev_err(&pdev->dev, "Cannot parse maxim,fast-charge-uamp field from DT\n");
 493                return ERR_PTR(ret);
 494        }
 495
 496        ret = of_property_read_u32(np, "maxim,eoc-uamp", &pdata->eoc_uamp);
 497        if (ret) {
 498                dev_err(&pdev->dev, "Cannot parse maxim,eoc-uamp field from DT\n");
 499                return ERR_PTR(ret);
 500        }
 501
 502        ret = of_property_read_u32(np, "maxim,ovp-uvolt", &pdata->ovp_uvolt);
 503        if (ret) {
 504                dev_err(&pdev->dev, "Cannot parse maxim,ovp-uvolt field from DT\n");
 505                return ERR_PTR(ret);
 506        }
 507
 508        return pdata;
 509}
 510#else /* CONFIG_OF */
 511static struct max14577_charger_platform_data *max14577_charger_dt_init(
 512                struct platform_device *pdev)
 513{
 514        return NULL;
 515}
 516#endif /* CONFIG_OF */
 517
 518static ssize_t show_fast_charge_timer(struct device *dev,
 519                struct device_attribute *attr, char *buf)
 520{
 521        struct max14577_charger *chg = dev_get_drvdata(dev);
 522        u8 reg_data;
 523        int ret;
 524        unsigned int val;
 525
 526        ret = max14577_read_reg(chg->max14577->regmap, MAX14577_REG_CHGCTRL1,
 527                        &reg_data);
 528        if (ret)
 529                return ret;
 530
 531        reg_data &= CHGCTRL1_TCHW_MASK;
 532        reg_data >>= CHGCTRL1_TCHW_SHIFT;
 533        switch (reg_data) {
 534        case 0x2 ... 0x4:
 535                val = reg_data + 3;
 536                break;
 537        case 0x7:
 538                val = 0;
 539                break;
 540        default:
 541                val = 5;
 542                break;
 543        }
 544
 545        return scnprintf(buf, PAGE_SIZE, "%u\n", val);
 546}
 547
 548static ssize_t store_fast_charge_timer(struct device *dev,
 549                struct device_attribute *attr, const char *buf, size_t count)
 550{
 551        struct max14577_charger *chg = dev_get_drvdata(dev);
 552        unsigned long val;
 553        int ret;
 554
 555        ret = kstrtoul(buf, 10, &val);
 556        if (ret)
 557                return ret;
 558
 559        ret = max14577_set_fast_charge_timer(chg, val);
 560        if (ret)
 561                return ret;
 562
 563        return count;
 564}
 565
 566static DEVICE_ATTR(fast_charge_timer, S_IRUGO | S_IWUSR,
 567                show_fast_charge_timer, store_fast_charge_timer);
 568
 569static int max14577_charger_probe(struct platform_device *pdev)
 570{
 571        struct max14577_charger *chg;
 572        struct power_supply_config psy_cfg = {};
 573        struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent);
 574        int ret;
 575
 576        chg = devm_kzalloc(&pdev->dev, sizeof(*chg), GFP_KERNEL);
 577        if (!chg)
 578                return -ENOMEM;
 579
 580        platform_set_drvdata(pdev, chg);
 581        chg->dev = &pdev->dev;
 582        chg->max14577 = max14577;
 583
 584        chg->pdata = max14577_charger_dt_init(pdev);
 585        if (IS_ERR_OR_NULL(chg->pdata))
 586                return PTR_ERR(chg->pdata);
 587
 588        ret = max14577_charger_reg_init(chg);
 589        if (ret)
 590                return ret;
 591
 592        ret = device_create_file(&pdev->dev, &dev_attr_fast_charge_timer);
 593        if (ret) {
 594                dev_err(&pdev->dev, "failed: create sysfs entry\n");
 595                return ret;
 596        }
 597
 598        psy_cfg.drv_data = chg;
 599        chg->charger = power_supply_register(&pdev->dev, &max14577_charger_desc,
 600                                                &psy_cfg);
 601        if (IS_ERR(chg->charger)) {
 602                dev_err(&pdev->dev, "failed: power supply register\n");
 603                ret = PTR_ERR(chg->charger);
 604                goto err;
 605        }
 606
 607        /* Check for valid values for charger */
 608        BUILD_BUG_ON(MAX14577_CHARGER_EOC_CURRENT_LIMIT_MIN +
 609                        MAX14577_CHARGER_EOC_CURRENT_LIMIT_STEP * 0xf !=
 610                        MAX14577_CHARGER_EOC_CURRENT_LIMIT_MAX);
 611        return 0;
 612
 613err:
 614        device_remove_file(&pdev->dev, &dev_attr_fast_charge_timer);
 615
 616        return ret;
 617}
 618
 619static int max14577_charger_remove(struct platform_device *pdev)
 620{
 621        struct max14577_charger *chg = platform_get_drvdata(pdev);
 622
 623        device_remove_file(&pdev->dev, &dev_attr_fast_charge_timer);
 624        power_supply_unregister(chg->charger);
 625
 626        return 0;
 627}
 628
 629static const struct platform_device_id max14577_charger_id[] = {
 630        { "max14577-charger", MAXIM_DEVICE_TYPE_MAX14577, },
 631        { "max77836-charger", MAXIM_DEVICE_TYPE_MAX77836, },
 632        { }
 633};
 634MODULE_DEVICE_TABLE(platform, max14577_charger_id);
 635
 636static struct platform_driver max14577_charger_driver = {
 637        .driver = {
 638                .name   = "max14577-charger",
 639        },
 640        .probe          = max14577_charger_probe,
 641        .remove         = max14577_charger_remove,
 642        .id_table       = max14577_charger_id,
 643};
 644module_platform_driver(max14577_charger_driver);
 645
 646MODULE_AUTHOR("Krzysztof Kozlowski <krzk@kernel.org>");
 647MODULE_DESCRIPTION("Maxim 14577/77836 charger driver");
 648MODULE_LICENSE("GPL");
 649