LXR linux/drivers/power/supply/max14577

   1// SPDX-License-Identifier: GPL-2.0+
   2//
   3// max14577_charger.c - Battery charger driver for the Maxim 14577/77836
   4//
   5// Copyright (C) 2013,2014 Samsung Electronics
   6// Krzysztof Kozlowski <krzk@kernel.org>
   7
   8#include <linux/module.h>
   9#include <linux/platform_device.h>
  10#include <linux/power_supply.h>
  11#include <linux/mfd/max14577-private.h>
  12#include <linux/mfd/max14577.h>
  13
  14struct max14577_charger {
  15        struct device           *dev;
  16        struct max14577         *max14577;
  17        struct power_supply     *charger;
  18
  19        struct max14577_charger_platform_data   *pdata;
  20};
  21
  22/*
  23 * Helper function for mapping values of STATUS2/CHGTYP register on max14577
  24 * and max77836 chipsets to enum maxim_muic_charger_type.
  25 */
  26static enum max14577_muic_charger_type maxim_get_charger_type(
  27                enum maxim_device_type dev_type, u8 val) {
  28        switch (val) {
  29        case MAX14577_CHARGER_TYPE_NONE:
  30        case MAX14577_CHARGER_TYPE_USB:
  31        case MAX14577_CHARGER_TYPE_DOWNSTREAM_PORT:
  32        case MAX14577_CHARGER_TYPE_DEDICATED_CHG:
  33        case MAX14577_CHARGER_TYPE_SPECIAL_500MA:
  34        case MAX14577_CHARGER_TYPE_SPECIAL_1A:
  35                return val;
  36        case MAX14577_CHARGER_TYPE_DEAD_BATTERY:
  37        case MAX14577_CHARGER_TYPE_RESERVED:
  38                if (dev_type == MAXIM_DEVICE_TYPE_MAX77836)
  39                        val |= 0x8;
  40                return val;
  41        default:
  42                WARN_ONCE(1, "max14577: Unsupported chgtyp register value 0x%02x", val);
  43                return val;
  44        }
  45}
  46
  47static int max14577_get_charger_state(struct max14577_charger *chg, int *val)
  48{
  49        struct regmap *rmap = chg->max14577->regmap;
  50        int ret;
  51        u8 reg_data;
  52
  53        /*
  54         * Charging occurs only if:
  55         *  - CHGCTRL2/MBCHOSTEN == 1
  56         *  - STATUS2/CGMBC == 1
  57         *
  58         * TODO:
  59         *  - handle FULL after Top-off timer (EOC register may be off
  60         *    and the charger won't be charging although MBCHOSTEN is on)
  61         *  - handle properly dead-battery charging (respect timer)
  62         *  - handle timers (fast-charge and prequal) /MBCCHGERR/
  63         */
  64        ret = max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL2, &reg_data);
  65        if (ret < 0)
  66                goto out;
  67
  68        if ((reg_data & CHGCTRL2_MBCHOSTEN_MASK) == 0) {
  69                *val = POWER_SUPPLY_STATUS_DISCHARGING;
  70                goto out;
  71        }
  72
  73        ret = max14577_read_reg(rmap, MAX14577_CHG_REG_STATUS3, &reg_data);
  74        if (ret < 0)
  75                goto out;
  76
  77        if (reg_data & STATUS3_CGMBC_MASK) {
  78                /* Charger or USB-cable is connected */
  79                if (reg_data & STATUS3_EOC_MASK)
  80                        *val = POWER_SUPPLY_STATUS_FULL;
  81                else
  82                        *val = POWER_SUPPLY_STATUS_CHARGING;
  83                goto out;
  84        }
  85
  86        *val = POWER_SUPPLY_STATUS_DISCHARGING;
  87
  88out:
  89        return ret;
  90}
  91
  92/*
  93 * Supported charge types:
  94 *  - POWER_SUPPLY_CHARGE_TYPE_NONE
  95 *  - POWER_SUPPLY_CHARGE_TYPE_FAST
  96 */
  97static int max14577_get_charge_type(struct max14577_charger *chg, int *val)
  98{
  99        int ret, charging;
 100
 101        /*
 102         * TODO: CHARGE_TYPE_TRICKLE (VCHGR_RC or EOC)?
 103         * As spec says:
 104         * [after reaching EOC interrupt]
 105         * "When the battery is fully charged, the 30-minute (typ)
 106         *  top-off timer starts. The device continues to trickle
 107         *  charge the battery until the top-off timer runs out."
 108         */
 109        ret = max14577_get_charger_state(chg, &charging);
 110        if (ret < 0)
 111                return ret;
 112
 113        if (charging == POWER_SUPPLY_STATUS_CHARGING)
 114                *val = POWER_SUPPLY_CHARGE_TYPE_FAST;
 115        else
 116                *val = POWER_SUPPLY_CHARGE_TYPE_NONE;
 117
 118        return 0;
 119}
 120
 121static int max14577_get_online(struct max14577_charger *chg, int *val)
 122{
 123        struct regmap *rmap = chg->max14577->regmap;
 124        u8 reg_data;
 125        int ret;
 126        enum max14577_muic_charger_type chg_type;
 127
 128        ret = max14577_read_reg(rmap, MAX14577_MUIC_REG_STATUS2, &reg_data);
 129        if (ret < 0)
 130                return ret;
 131
 132        reg_data = ((reg_data & STATUS2_CHGTYP_MASK) >> STATUS2_CHGTYP_SHIFT);
 133        chg_type = maxim_get_charger_type(chg->max14577->dev_type, reg_data);
 134        switch (chg_type) {
 135        case MAX14577_CHARGER_TYPE_USB:
 136        case MAX14577_CHARGER_TYPE_DEDICATED_CHG:
 137        case MAX14577_CHARGER_TYPE_SPECIAL_500MA:
 138        case MAX14577_CHARGER_TYPE_SPECIAL_1A:
 139        case MAX14577_CHARGER_TYPE_DEAD_BATTERY:
 140        case MAX77836_CHARGER_TYPE_SPECIAL_BIAS:
 141                *val = 1;
 142                break;
 143        case MAX14577_CHARGER_TYPE_NONE:
 144        case MAX14577_CHARGER_TYPE_DOWNSTREAM_PORT:
 145        case MAX14577_CHARGER_TYPE_RESERVED:
 146        case MAX77836_CHARGER_TYPE_RESERVED:
 147        default:
 148                *val = 0;
 149        }
 150
 151        return 0;
 152}
 153
 154/*
 155 * Supported health statuses:
 156 *  - POWER_SUPPLY_HEALTH_DEAD
 157 *  - POWER_SUPPLY_HEALTH_OVERVOLTAGE
 158 *  - POWER_SUPPLY_HEALTH_GOOD
 159 */
 160static int max14577_get_battery_health(struct max14577_charger *chg, int *val)
 161{
 162        struct regmap *rmap = chg->max14577->regmap;
 163        int ret;
 164        u8 reg_data;
 165        enum max14577_muic_charger_type chg_type;
 166
 167        ret = max14577_read_reg(rmap, MAX14577_MUIC_REG_STATUS2, &reg_data);
 168        if (ret < 0)
 169                goto out;
 170
 171        reg_data = ((reg_data & STATUS2_CHGTYP_MASK) >> STATUS2_CHGTYP_SHIFT);
 172        chg_type = maxim_get_charger_type(chg->max14577->dev_type, reg_data);
 173        if (chg_type == MAX14577_CHARGER_TYPE_DEAD_BATTERY) {
 174                *val = POWER_SUPPLY_HEALTH_DEAD;
 175                goto out;
 176        }
 177
 178        ret = max14577_read_reg(rmap, MAX14577_CHG_REG_STATUS3, &reg_data);
 179        if (ret < 0)
 180                goto out;
 181
 182        if (reg_data & STATUS3_OVP_MASK) {
 183                *val = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
 184                goto out;
 185        }
 186
 187        /* Not dead, not overvoltage */
 188        *val = POWER_SUPPLY_HEALTH_GOOD;
 189
 190out:
 191        return ret;
 192}
 193
 194/*
 195 * Always returns 1.
 196 * The max14577 chip doesn't report any status of battery presence.
 197 * Lets assume that it will always be used with some battery.
 198 */
 199static int max14577_get_present(struct max14577_charger *chg, int *val)
 200{
 201        *val = 1;
 202
 203        return 0;
 204}
 205
 206static int max14577_set_fast_charge_timer(struct max14577_charger *chg,
 207                unsigned long hours)
 208{
 209        u8 reg_data;
 210
 211        switch (hours) {
 212        case 5 ... 7:
 213                reg_data = hours - 3;
 214                break;
 215        case 0:
 216                /* Disable */
 217                reg_data = 0x7;
 218                break;
 219        default:
 220                dev_err(chg->dev, "Wrong value for Fast-Charge Timer: %lu\n",
 221                                hours);
 222                return -EINVAL;
 223        }
 224        reg_data <<= CHGCTRL1_TCHW_SHIFT;
 225
 226        return max14577_update_reg(chg->max14577->regmap,
 227                        MAX14577_REG_CHGCTRL1, CHGCTRL1_TCHW_MASK, reg_data);
 228}
 229
 230static int max14577_init_constant_voltage(struct max14577_charger *chg,
 231                unsigned int uvolt)
 232{
 233        u8 reg_data;
 234
 235        if (uvolt < MAXIM_CHARGER_CONSTANT_VOLTAGE_MIN ||
 236                        uvolt > MAXIM_CHARGER_CONSTANT_VOLTAGE_MAX)
 237                return -EINVAL;
 238
 239        if (uvolt == 4200000)
 240                reg_data = 0x0;
 241        else if (uvolt == MAXIM_CHARGER_CONSTANT_VOLTAGE_MAX)
 242                reg_data = 0x1f;
 243        else if (uvolt <= 4280000) {
 244                unsigned int val = uvolt;
 245
 246                val -= MAXIM_CHARGER_CONSTANT_VOLTAGE_MIN;
 247                val /= MAXIM_CHARGER_CONSTANT_VOLTAGE_STEP;
 248                if (uvolt <= 4180000)
 249                        reg_data = 0x1 + val;
 250                else
 251                        reg_data = val; /* Fix for gap between 4.18V and 4.22V */
 252        } else
 253                return -EINVAL;
 254
 255        reg_data <<= CHGCTRL3_MBCCVWRC_SHIFT;
 256
 257        return max14577_write_reg(chg->max14577->regmap,
 258                        MAX14577_CHG_REG_CHG_CTRL3, reg_data);
 259}
 260
 261static int max14577_init_eoc(struct max14577_charger *chg,
 262                unsigned int uamp)
 263{
 264        unsigned int current_bits = 0xf;
 265        u8 reg_data;
 266
 267        switch (chg->max14577->dev_type) {
 268        case MAXIM_DEVICE_TYPE_MAX77836:
 269                if (uamp < 5000)
 270                        return -EINVAL; /* Requested current is too low */
 271
 272                if (uamp >= 7500 && uamp < 10000)
 273                        current_bits = 0x0;
 274                else if (uamp <= 50000) {
 275                        /* <5000, 7499> and <10000, 50000> */
 276                        current_bits = uamp / 5000;
 277                } else {
 278                        uamp = min(uamp, 100000U) - 50000U;
 279                        current_bits = 0xa + uamp / 10000;
 280                }
 281                break;
 282
 283        case MAXIM_DEVICE_TYPE_MAX14577:
 284        default:
 285                if (uamp < MAX14577_CHARGER_EOC_CURRENT_LIMIT_MIN)
 286                        return -EINVAL; /* Requested current is too low */
 287
 288                uamp = min(uamp, MAX14577_CHARGER_EOC_CURRENT_LIMIT_MAX);
 289                uamp -= MAX14577_CHARGER_EOC_CURRENT_LIMIT_MIN;
 290                current_bits = uamp / MAX14577_CHARGER_EOC_CURRENT_LIMIT_STEP;
 291                break;
 292        }
 293
 294        reg_data = current_bits << CHGCTRL5_EOCS_SHIFT;
 295
 296        return max14577_update_reg(chg->max14577->regmap,
 297                        MAX14577_CHG_REG_CHG_CTRL5, CHGCTRL5_EOCS_MASK,
 298                        reg_data);
 299}
 300
 301static int max14577_init_fast_charge(struct max14577_charger *chg,
 302                unsigned int uamp)
 303{
 304        u8 reg_data;
 305        int ret;
 306        const struct maxim_charger_current *limits =
 307                &maxim_charger_currents[chg->max14577->dev_type];
 308
 309        ret = maxim_charger_calc_reg_current(limits, uamp, uamp, &reg_data);
 310        if (ret) {
 311                dev_err(chg->dev, "Wrong value for fast charge: %u\n", uamp);
 312                return ret;
 313        }
 314
 315        return max14577_update_reg(chg->max14577->regmap,
 316                        MAX14577_CHG_REG_CHG_CTRL4,
 317                        CHGCTRL4_MBCICHWRCL_MASK | CHGCTRL4_MBCICHWRCH_MASK,
 318                        reg_data);
 319}
 320
 321/*
 322 * Sets charger registers to proper and safe default values.
 323 * Some of these values are equal to defaults in MAX14577E
 324 * data sheet but there are minor differences.
 325 */
 326static int max14577_charger_reg_init(struct max14577_charger *chg)
 327{
 328        struct regmap *rmap = chg->max14577->regmap;
 329        u8 reg_data;
 330        int ret;
 331
 332        /*
 333         * Charger-Type Manual Detection, default off (set CHGTYPMAN to 0)
 334         * Charger-Detection Enable, default on (set CHGDETEN to 1)
 335         * Combined mask of CHGDETEN and CHGTYPMAN will zero the CHGTYPMAN bit
 336         */
 337        reg_data = 0x1 << CDETCTRL1_CHGDETEN_SHIFT;
 338        max14577_update_reg(rmap, MAX14577_REG_CDETCTRL1,
 339                        CDETCTRL1_CHGDETEN_MASK | CDETCTRL1_CHGTYPMAN_MASK,
 340                        reg_data);
 341
 342        /*
 343         * Wall-Adapter Rapid Charge, default on
 344         * Battery-Charger, default on
 345         */
 346        reg_data = 0x1 << CHGCTRL2_VCHGR_RC_SHIFT;
 347        reg_data |= 0x1 << CHGCTRL2_MBCHOSTEN_SHIFT;
 348        max14577_write_reg(rmap, MAX14577_REG_CHGCTRL2, reg_data);
 349
 350        /* Auto Charging Stop, default off */
 351        reg_data = 0x0 << CHGCTRL6_AUTOSTOP_SHIFT;
 352        max14577_write_reg(rmap, MAX14577_REG_CHGCTRL6, reg_data);
 353
 354        ret = max14577_init_constant_voltage(chg, chg->pdata->constant_uvolt);
 355        if (ret)
 356                return ret;
 357
 358        ret = max14577_init_eoc(chg, chg->pdata->eoc_uamp);
 359        if (ret)
 360                return ret;
 361
 362        ret = max14577_init_fast_charge(chg, chg->pdata->fast_charge_uamp);
 363        if (ret)
 364                return ret;
 365
 366        ret = max14577_set_fast_charge_timer(chg,
 367                        MAXIM_CHARGER_FAST_CHARGE_TIMER_DEFAULT);
 368        if (ret)
 369                return ret;
 370
 371        /* Initialize Overvoltage-Protection Threshold */
 372        switch (chg->pdata->ovp_uvolt) {
 373        case 7500000:
 374                reg_data = 0x0;
 375                break;
 376        case 6000000:
 377        case 6500000:
 378        case 7000000:
 379                reg_data = 0x1 + (chg->pdata->ovp_uvolt - 6000000) / 500000;
 380                break;
 381        default:
 382                dev_err(chg->dev, "Wrong value for OVP: %u\n",
 383                                chg->pdata->ovp_uvolt);
 384                return -EINVAL;
 385        }
 386        reg_data <<= CHGCTRL7_OTPCGHCVS_SHIFT;
 387        max14577_write_reg(rmap, MAX14577_REG_CHGCTRL7, reg_data);
 388
 389        return 0;
 390}
 391
 392/* Support property from charger */
 393static enum power_supply_property max14577_charger_props[] = {
 394        POWER_SUPPLY_PROP_STATUS,
 395        POWER_SUPPLY_PROP_CHARGE_TYPE,
 396        POWER_SUPPLY_PROP_HEALTH,
 397        POWER_SUPPLY_PROP_PRESENT,
 398        POWER_SUPPLY_PROP_ONLINE,
 399        POWER_SUPPLY_PROP_MODEL_NAME,
 400        POWER_SUPPLY_PROP_MANUFACTURER,
 401};
 402
 403static const char * const model_names[] = {
 404        [MAXIM_DEVICE_TYPE_UNKNOWN]     = "MAX14577-like",
 405        [MAXIM_DEVICE_TYPE_MAX14577]    = "MAX14577",
 406        [MAXIM_DEVICE_TYPE_MAX77836]    = "MAX77836",
 407};
 408static const char *manufacturer = "Maxim Integrated";
 409
 410static int max14577_charger_get_property(struct power_supply *psy,
 411                            enum power_supply_property psp,
 412                            union power_supply_propval *val)
 413{
 414        struct max14577_charger *chg = power_supply_get_drvdata(psy);
 415        int ret = 0;
 416
 417        switch (psp) {
 418        case POWER_SUPPLY_PROP_STATUS:
 419                ret = max14577_get_charger_state(chg, &val->intval);
 420                break;
 421        case POWER_SUPPLY_PROP_CHARGE_TYPE:
 422                ret = max14577_get_charge_type(chg, &val->intval);
 423                break;
 424        case POWER_SUPPLY_PROP_HEALTH:
 425                ret = max14577_get_battery_health(chg, &val->intval);
 426                break;
 427        case POWER_SUPPLY_PROP_PRESENT:
 428                ret = max14577_get_present(chg, &val->intval);
 429                break;
 430        case POWER_SUPPLY_PROP_ONLINE:
 431                ret = max14577_get_online(chg, &val->intval);
 432                break;
 433        case POWER_SUPPLY_PROP_MODEL_NAME:
 434                BUILD_BUG_ON(ARRAY_SIZE(model_names) != MAXIM_DEVICE_TYPE_NUM);
 435                val->strval = model_names[chg->max14577->dev_type];
 436                break;
 437        case POWER_SUPPLY_PROP_MANUFACTURER:
 438                val->strval = manufacturer;
 439                break;
 440        default:
 441                return -EINVAL;
 442        }
 443
 444        return ret;
 445}
 446
 447static const struct power_supply_desc max14577_charger_desc = {
 448        .name = "max14577-charger",
 449        .type = POWER_SUPPLY_TYPE_BATTERY,
 450        .properties = max14577_charger_props,
 451        .num_properties = ARRAY_SIZE(max14577_charger_props),
 452        .get_property = max14577_charger_get_property,
 453};
 454
 455#ifdef CONFIG_OF
 456static struct max14577_charger_platform_data *max14577_charger_dt_init(
 457                struct platform_device *pdev)
 458{
 459        struct max14577_charger_platform_data *pdata;
 460        struct device_node *np = pdev->dev.of_node;
 461        int ret;
 462
 463        if (!np) {
 464                dev_err(&pdev->dev, "No charger OF node\n");
 465                return ERR_PTR(-EINVAL);
 466        }
 467
 468        pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
 469        if (!pdata)
 470                return ERR_PTR(-ENOMEM);
 471
 472        ret = of_property_read_u32(np, "maxim,constant-uvolt",
 473                        &pdata->constant_uvolt);
 474        if (ret) {
 475                dev_err(&pdev->dev, "Cannot parse maxim,constant-uvolt field from DT\n");
 476                return ERR_PTR(ret);
 477        }
 478
 479        ret = of_property_read_u32(np, "maxim,fast-charge-uamp",
 480                        &pdata->fast_charge_uamp);
 481        if (ret) {
 482                dev_err(&pdev->dev, "Cannot parse maxim,fast-charge-uamp field from DT\n");
 483                return ERR_PTR(ret);
 484        }
 485
 486        ret = of_property_read_u32(np, "maxim,eoc-uamp", &pdata->eoc_uamp);
 487        if (ret) {
 488                dev_err(&pdev->dev, "Cannot parse maxim,eoc-uamp field from DT\n");
 489                return ERR_PTR(ret);
 490        }
 491
 492        ret = of_property_read_u32(np, "maxim,ovp-uvolt", &pdata->ovp_uvolt);
 493        if (ret) {
 494                dev_err(&pdev->dev, "Cannot parse maxim,ovp-uvolt field from DT\n");
 495                return ERR_PTR(ret);
 496        }
 497
 498        return pdata;
 499}
 500#else /* CONFIG_OF */
 501static struct max14577_charger_platform_data *max14577_charger_dt_init(
 502                struct platform_device *pdev)
 503{
 504        return NULL;
 505}
 506#endif /* CONFIG_OF */
 507
 508static ssize_t show_fast_charge_timer(struct device *dev,
 509                struct device_attribute *attr, char *buf)
 510{
 511        struct max14577_charger *chg = dev_get_drvdata(dev);
 512        u8 reg_data;
 513        int ret;
 514        unsigned int val;
 515
 516        ret = max14577_read_reg(chg->max14577->regmap, MAX14577_REG_CHGCTRL1,
 517                        &reg_data);
 518        if (ret)
 519                return ret;
 520
 521        reg_data &= CHGCTRL1_TCHW_MASK;
 522        reg_data >>= CHGCTRL1_TCHW_SHIFT;
 523        switch (reg_data) {
 524        case 0x2 ... 0x4:
 525                val = reg_data + 3;
 526                break;
 527        case 0x7:
 528                val = 0;
 529                break;
 530        default:
 531                val = 5;
 532                break;
 533        }
 534
 535        return scnprintf(buf, PAGE_SIZE, "%u\n", val);
 536}
 537
 538static ssize_t store_fast_charge_timer(struct device *dev,
 539                struct device_attribute *attr, const char *buf, size_t count)
 540{
 541        struct max14577_charger *chg = dev_get_drvdata(dev);
 542        unsigned long val;
 543        int ret;
 544
 545        ret = kstrtoul(buf, 10, &val);
 546        if (ret)
 547                return ret;
 548
 549        ret = max14577_set_fast_charge_timer(chg, val);
 550        if (ret)
 551                return ret;
 552
 553        return count;
 554}
 555
 556static DEVICE_ATTR(fast_charge_timer, S_IRUGO | S_IWUSR,
 557                show_fast_charge_timer, store_fast_charge_timer);
 558
 559static int max14577_charger_probe(struct platform_device *pdev)
 560{
 561        struct max14577_charger *chg;
 562        struct power_supply_config psy_cfg = {};
 563        struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent);
 564        int ret;
 565
 566        chg = devm_kzalloc(&pdev->dev, sizeof(*chg), GFP_KERNEL);
 567        if (!chg)
 568                return -ENOMEM;
 569
 570        platform_set_drvdata(pdev, chg);
 571        chg->dev = &pdev->dev;
 572        chg->max14577 = max14577;
 573
 574        chg->pdata = max14577_charger_dt_init(pdev);
 575        if (IS_ERR_OR_NULL(chg->pdata))
 576                return PTR_ERR(chg->pdata);
 577
 578        ret = max14577_charger_reg_init(chg);
 579        if (ret)
 580                return ret;
 581
 582        ret = device_create_file(&pdev->dev, &dev_attr_fast_charge_timer);
 583        if (ret) {
 584                dev_err(&pdev->dev, "failed: create sysfs entry\n");
 585                return ret;
 586        }
 587
 588        psy_cfg.drv_data = chg;
 589        chg->charger = power_supply_register(&pdev->dev, &max14577_charger_desc,
 590                                                &psy_cfg);
 591        if (IS_ERR(chg->charger)) {
 592                dev_err(&pdev->dev, "failed: power supply register\n");
 593                ret = PTR_ERR(chg->charger);
 594                goto err;
 595        }
 596
 597        /* Check for valid values for charger */
 598        BUILD_BUG_ON(MAX14577_CHARGER_EOC_CURRENT_LIMIT_MIN +
 599                        MAX14577_CHARGER_EOC_CURRENT_LIMIT_STEP * 0xf !=
 600                        MAX14577_CHARGER_EOC_CURRENT_LIMIT_MAX);
 601        return 0;
 602
 603err:
 604        device_remove_file(&pdev->dev, &dev_attr_fast_charge_timer);
 605
 606        return ret;
 607}
 608
 609static int max14577_charger_remove(struct platform_device *pdev)
 610{
 611        struct max14577_charger *chg = platform_get_drvdata(pdev);
 612
 613        device_remove_file(&pdev->dev, &dev_attr_fast_charge_timer);
 614        power_supply_unregister(chg->charger);
 615
 616        return 0;
 617}
 618
 619static const struct platform_device_id max14577_charger_id[] = {
 620        { "max14577-charger", MAXIM_DEVICE_TYPE_MAX14577, },
 621        { "max77836-charger", MAXIM_DEVICE_TYPE_MAX77836, },
 622        { }
 623};
 624MODULE_DEVICE_TABLE(platform, max14577_charger_id);
 625
 626static struct platform_driver max14577_charger_driver = {
 627        .driver = {
 628                .name   = "max14577-charger",
 629        },
 630        .probe          = max14577_charger_probe,
 631        .remove         = max14577_charger_remove,
 632        .id_table       = max14577_charger_id,
 633};
 634module_platform_driver(max14577_charger_driver);
 635
 636MODULE_AUTHOR("Krzysztof Kozlowski <krzk@kernel.org>");
 637MODULE_DESCRIPTION("Maxim 14577/77836 charger driver");
 638MODULE_LICENSE("GPL");
 639