linux/drivers/regulator/max77686.c
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   1/*
   2 * max77686.c - Regulator driver for the Maxim 77686
   3 *
   4 * Copyright (C) 2012 Samsung Electronics
   5 * Chiwoong Byun <woong.byun@smasung.com>
   6 * Jonghwa Lee <jonghwa3.lee@samsung.com>
   7 *
   8 * This program is free software; you can redistribute it and/or modify
   9 * it under the terms of the GNU General Public License as published by
  10 * the Free Software Foundation; either version 2 of the License, or
  11 * (at your option) any later version.
  12 *
  13 * This program is distributed in the hope that it will be useful,
  14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 * GNU General Public License for more details.
  17 *
  18 * You should have received a copy of the GNU General Public License
  19 * along with this program; if not, write to the Free Software
  20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21 *
  22 * This driver is based on max8997.c
  23 */
  24
  25#include <linux/kernel.h>
  26#include <linux/bug.h>
  27#include <linux/delay.h>
  28#include <linux/err.h>
  29#include <linux/gpio.h>
  30#include <linux/slab.h>
  31#include <linux/platform_device.h>
  32#include <linux/regulator/driver.h>
  33#include <linux/regulator/machine.h>
  34#include <linux/regulator/of_regulator.h>
  35#include <linux/mfd/max77686.h>
  36#include <linux/mfd/max77686-private.h>
  37
  38#define MAX77686_LDO_MINUV      800000
  39#define MAX77686_LDO_UVSTEP     50000
  40#define MAX77686_LDO_LOW_MINUV  800000
  41#define MAX77686_LDO_LOW_UVSTEP 25000
  42#define MAX77686_BUCK_MINUV     750000
  43#define MAX77686_BUCK_UVSTEP    50000
  44#define MAX77686_RAMP_DELAY     100000                  /* uV/us */
  45#define MAX77686_DVS_RAMP_DELAY 27500                   /* uV/us */
  46#define MAX77686_DVS_MINUV      600000
  47#define MAX77686_DVS_UVSTEP     12500
  48
  49#define MAX77686_OPMODE_SHIFT   6
  50#define MAX77686_OPMODE_BUCK234_SHIFT   4
  51#define MAX77686_OPMODE_MASK    0x3
  52
  53#define MAX77686_VSEL_MASK      0x3F
  54#define MAX77686_DVS_VSEL_MASK  0xFF
  55
  56#define MAX77686_RAMP_RATE_MASK 0xC0
  57
  58#define MAX77686_REGULATORS     MAX77686_REG_MAX
  59#define MAX77686_LDOS           26
  60
  61enum max77686_ramp_rate {
  62        RAMP_RATE_13P75MV,
  63        RAMP_RATE_27P5MV,
  64        RAMP_RATE_55MV,
  65        RAMP_RATE_NO_CTRL,      /* 100mV/us */
  66};
  67
  68struct max77686_data {
  69        struct regulator_dev *rdev[MAX77686_REGULATORS];
  70        unsigned int opmode[MAX77686_REGULATORS];
  71};
  72
  73/* Some BUCKS supports Normal[ON/OFF] mode during suspend */
  74static int max77686_buck_set_suspend_disable(struct regulator_dev *rdev)
  75{
  76        unsigned int val;
  77        struct max77686_data *max77686 = rdev_get_drvdata(rdev);
  78        int ret, id = rdev_get_id(rdev);
  79
  80        if (id == MAX77686_BUCK1)
  81                val = 0x1;
  82        else
  83                val = 0x1 << MAX77686_OPMODE_BUCK234_SHIFT;
  84
  85        ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
  86                                 rdev->desc->enable_mask, val);
  87        if (ret)
  88                return ret;
  89
  90        max77686->opmode[id] = val;
  91        return 0;
  92}
  93
  94/* Some LDOs supports [LPM/Normal]ON mode during suspend state */
  95static int max77686_set_suspend_mode(struct regulator_dev *rdev,
  96                                     unsigned int mode)
  97{
  98        struct max77686_data *max77686 = rdev_get_drvdata(rdev);
  99        unsigned int val;
 100        int ret, id = rdev_get_id(rdev);
 101
 102        /* BUCK[5-9] doesn't support this feature */
 103        if (id >= MAX77686_BUCK5)
 104                return 0;
 105
 106        switch (mode) {
 107        case REGULATOR_MODE_IDLE:                       /* ON in LP Mode */
 108                val = 0x2 << MAX77686_OPMODE_SHIFT;
 109                break;
 110        case REGULATOR_MODE_NORMAL:                     /* ON in Normal Mode */
 111                val = 0x3 << MAX77686_OPMODE_SHIFT;
 112                break;
 113        default:
 114                pr_warn("%s: regulator_suspend_mode : 0x%x not supported\n",
 115                        rdev->desc->name, mode);
 116                return -EINVAL;
 117        }
 118
 119        ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 120                                  rdev->desc->enable_mask, val);
 121        if (ret)
 122                return ret;
 123
 124        max77686->opmode[id] = val;
 125        return 0;
 126}
 127
 128/* Some LDOs supports LPM-ON/OFF/Normal-ON mode during suspend state */
 129static int max77686_ldo_set_suspend_mode(struct regulator_dev *rdev,
 130                                     unsigned int mode)
 131{
 132        unsigned int val;
 133        struct max77686_data *max77686 = rdev_get_drvdata(rdev);
 134        int ret;
 135
 136        switch (mode) {
 137        case REGULATOR_MODE_STANDBY:                    /* switch off */
 138                val = 0x1 << MAX77686_OPMODE_SHIFT;
 139                break;
 140        case REGULATOR_MODE_IDLE:                       /* ON in LP Mode */
 141                val = 0x2 << MAX77686_OPMODE_SHIFT;
 142                break;
 143        case REGULATOR_MODE_NORMAL:                     /* ON in Normal Mode */
 144                val = 0x3 << MAX77686_OPMODE_SHIFT;
 145                break;
 146        default:
 147                pr_warn("%s: regulator_suspend_mode : 0x%x not supported\n",
 148                        rdev->desc->name, mode);
 149                return -EINVAL;
 150        }
 151
 152        ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 153                                 rdev->desc->enable_mask, val);
 154        if (ret)
 155                return ret;
 156
 157        max77686->opmode[rdev_get_id(rdev)] = val;
 158        return 0;
 159}
 160
 161static int max77686_enable(struct regulator_dev *rdev)
 162{
 163        struct max77686_data *max77686 = rdev_get_drvdata(rdev);
 164
 165        return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 166                                  rdev->desc->enable_mask,
 167                                  max77686->opmode[rdev_get_id(rdev)]);
 168}
 169
 170static int max77686_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
 171{
 172        unsigned int ramp_value = RAMP_RATE_NO_CTRL;
 173
 174        switch (ramp_delay) {
 175        case 1 ... 13750:
 176                ramp_value = RAMP_RATE_13P75MV;
 177                break;
 178        case 13751 ... 27500:
 179                ramp_value = RAMP_RATE_27P5MV;
 180                break;
 181        case 27501 ... 55000:
 182                ramp_value = RAMP_RATE_55MV;
 183                break;
 184        case 55001 ... 100000:
 185                break;
 186        default:
 187                pr_warn("%s: ramp_delay: %d not supported, setting 100000\n",
 188                        rdev->desc->name, ramp_delay);
 189        }
 190
 191        return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 192                                  MAX77686_RAMP_RATE_MASK, ramp_value << 6);
 193}
 194
 195static struct regulator_ops max77686_ops = {
 196        .list_voltage           = regulator_list_voltage_linear,
 197        .map_voltage            = regulator_map_voltage_linear,
 198        .is_enabled             = regulator_is_enabled_regmap,
 199        .enable                 = max77686_enable,
 200        .disable                = regulator_disable_regmap,
 201        .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 202        .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 203        .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 204        .set_suspend_mode       = max77686_set_suspend_mode,
 205};
 206
 207static struct regulator_ops max77686_ldo_ops = {
 208        .list_voltage           = regulator_list_voltage_linear,
 209        .map_voltage            = regulator_map_voltage_linear,
 210        .is_enabled             = regulator_is_enabled_regmap,
 211        .enable                 = max77686_enable,
 212        .disable                = regulator_disable_regmap,
 213        .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 214        .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 215        .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 216        .set_suspend_mode       = max77686_ldo_set_suspend_mode,
 217};
 218
 219static struct regulator_ops max77686_buck1_ops = {
 220        .list_voltage           = regulator_list_voltage_linear,
 221        .map_voltage            = regulator_map_voltage_linear,
 222        .is_enabled             = regulator_is_enabled_regmap,
 223        .enable                 = max77686_enable,
 224        .disable                = regulator_disable_regmap,
 225        .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 226        .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 227        .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 228        .set_suspend_disable    = max77686_buck_set_suspend_disable,
 229};
 230
 231static struct regulator_ops max77686_buck_dvs_ops = {
 232        .list_voltage           = regulator_list_voltage_linear,
 233        .map_voltage            = regulator_map_voltage_linear,
 234        .is_enabled             = regulator_is_enabled_regmap,
 235        .enable                 = max77686_enable,
 236        .disable                = regulator_disable_regmap,
 237        .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 238        .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 239        .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 240        .set_ramp_delay         = max77686_set_ramp_delay,
 241        .set_suspend_disable    = max77686_buck_set_suspend_disable,
 242};
 243
 244#define regulator_desc_ldo(num)         {                               \
 245        .name           = "LDO"#num,                                    \
 246        .id             = MAX77686_LDO##num,                            \
 247        .ops            = &max77686_ops,                                \
 248        .type           = REGULATOR_VOLTAGE,                            \
 249        .owner          = THIS_MODULE,                                  \
 250        .min_uV         = MAX77686_LDO_MINUV,                           \
 251        .uV_step        = MAX77686_LDO_UVSTEP,                          \
 252        .ramp_delay     = MAX77686_RAMP_DELAY,                          \
 253        .n_voltages     = MAX77686_VSEL_MASK + 1,                       \
 254        .vsel_reg       = MAX77686_REG_LDO1CTRL1 + num - 1,             \
 255        .vsel_mask      = MAX77686_VSEL_MASK,                           \
 256        .enable_reg     = MAX77686_REG_LDO1CTRL1 + num - 1,             \
 257        .enable_mask    = MAX77686_OPMODE_MASK                          \
 258                        << MAX77686_OPMODE_SHIFT,                       \
 259}
 260#define regulator_desc_lpm_ldo(num)     {                               \
 261        .name           = "LDO"#num,                                    \
 262        .id             = MAX77686_LDO##num,                            \
 263        .ops            = &max77686_ldo_ops,                            \
 264        .type           = REGULATOR_VOLTAGE,                            \
 265        .owner          = THIS_MODULE,                                  \
 266        .min_uV         = MAX77686_LDO_MINUV,                           \
 267        .uV_step        = MAX77686_LDO_UVSTEP,                          \
 268        .ramp_delay     = MAX77686_RAMP_DELAY,                          \
 269        .n_voltages     = MAX77686_VSEL_MASK + 1,                       \
 270        .vsel_reg       = MAX77686_REG_LDO1CTRL1 + num - 1,             \
 271        .vsel_mask      = MAX77686_VSEL_MASK,                           \
 272        .enable_reg     = MAX77686_REG_LDO1CTRL1 + num - 1,             \
 273        .enable_mask    = MAX77686_OPMODE_MASK                          \
 274                        << MAX77686_OPMODE_SHIFT,                       \
 275}
 276#define regulator_desc_ldo_low(num)             {                       \
 277        .name           = "LDO"#num,                                    \
 278        .id             = MAX77686_LDO##num,                            \
 279        .ops            = &max77686_ldo_ops,                            \
 280        .type           = REGULATOR_VOLTAGE,                            \
 281        .owner          = THIS_MODULE,                                  \
 282        .min_uV         = MAX77686_LDO_LOW_MINUV,                       \
 283        .uV_step        = MAX77686_LDO_LOW_UVSTEP,                      \
 284        .ramp_delay     = MAX77686_RAMP_DELAY,                          \
 285        .n_voltages     = MAX77686_VSEL_MASK + 1,                       \
 286        .vsel_reg       = MAX77686_REG_LDO1CTRL1 + num - 1,             \
 287        .vsel_mask      = MAX77686_VSEL_MASK,                           \
 288        .enable_reg     = MAX77686_REG_LDO1CTRL1 + num - 1,             \
 289        .enable_mask    = MAX77686_OPMODE_MASK                          \
 290                        << MAX77686_OPMODE_SHIFT,                       \
 291}
 292#define regulator_desc_ldo1_low(num)            {                       \
 293        .name           = "LDO"#num,                                    \
 294        .id             = MAX77686_LDO##num,                            \
 295        .ops            = &max77686_ops,                                \
 296        .type           = REGULATOR_VOLTAGE,                            \
 297        .owner          = THIS_MODULE,                                  \
 298        .min_uV         = MAX77686_LDO_LOW_MINUV,                       \
 299        .uV_step        = MAX77686_LDO_LOW_UVSTEP,                      \
 300        .ramp_delay     = MAX77686_RAMP_DELAY,                          \
 301        .n_voltages     = MAX77686_VSEL_MASK + 1,                       \
 302        .vsel_reg       = MAX77686_REG_LDO1CTRL1 + num - 1,             \
 303        .vsel_mask      = MAX77686_VSEL_MASK,                           \
 304        .enable_reg     = MAX77686_REG_LDO1CTRL1 + num - 1,             \
 305        .enable_mask    = MAX77686_OPMODE_MASK                          \
 306                        << MAX77686_OPMODE_SHIFT,                       \
 307}
 308#define regulator_desc_buck(num)                {                       \
 309        .name           = "BUCK"#num,                                   \
 310        .id             = MAX77686_BUCK##num,                           \
 311        .ops            = &max77686_ops,                                \
 312        .type           = REGULATOR_VOLTAGE,                            \
 313        .owner          = THIS_MODULE,                                  \
 314        .min_uV         = MAX77686_BUCK_MINUV,                          \
 315        .uV_step        = MAX77686_BUCK_UVSTEP,                         \
 316        .ramp_delay     = MAX77686_RAMP_DELAY,                          \
 317        .n_voltages     = MAX77686_VSEL_MASK + 1,                       \
 318        .vsel_reg       = MAX77686_REG_BUCK5OUT + (num - 5) * 2,        \
 319        .vsel_mask      = MAX77686_VSEL_MASK,                           \
 320        .enable_reg     = MAX77686_REG_BUCK5CTRL + (num - 5) * 2,       \
 321        .enable_mask    = MAX77686_OPMODE_MASK,                         \
 322}
 323#define regulator_desc_buck1(num)               {                       \
 324        .name           = "BUCK"#num,                                   \
 325        .id             = MAX77686_BUCK##num,                           \
 326        .ops            = &max77686_buck1_ops,                          \
 327        .type           = REGULATOR_VOLTAGE,                            \
 328        .owner          = THIS_MODULE,                                  \
 329        .min_uV         = MAX77686_BUCK_MINUV,                          \
 330        .uV_step        = MAX77686_BUCK_UVSTEP,                         \
 331        .ramp_delay     = MAX77686_RAMP_DELAY,                          \
 332        .n_voltages     = MAX77686_VSEL_MASK + 1,                       \
 333        .vsel_reg       = MAX77686_REG_BUCK1OUT,                        \
 334        .vsel_mask      = MAX77686_VSEL_MASK,                           \
 335        .enable_reg     = MAX77686_REG_BUCK1CTRL,                       \
 336        .enable_mask    = MAX77686_OPMODE_MASK,                         \
 337}
 338#define regulator_desc_buck_dvs(num)            {                       \
 339        .name           = "BUCK"#num,                                   \
 340        .id             = MAX77686_BUCK##num,                           \
 341        .ops            = &max77686_buck_dvs_ops,                       \
 342        .type           = REGULATOR_VOLTAGE,                            \
 343        .owner          = THIS_MODULE,                                  \
 344        .min_uV         = MAX77686_DVS_MINUV,                           \
 345        .uV_step        = MAX77686_DVS_UVSTEP,                          \
 346        .ramp_delay     = MAX77686_DVS_RAMP_DELAY,                      \
 347        .n_voltages     = MAX77686_DVS_VSEL_MASK + 1,                   \
 348        .vsel_reg       = MAX77686_REG_BUCK2DVS1 + (num - 2) * 10,      \
 349        .vsel_mask      = MAX77686_DVS_VSEL_MASK,                       \
 350        .enable_reg     = MAX77686_REG_BUCK2CTRL1 + (num - 2) * 10,     \
 351        .enable_mask    = MAX77686_OPMODE_MASK                          \
 352                        << MAX77686_OPMODE_BUCK234_SHIFT,               \
 353}
 354
 355static struct regulator_desc regulators[] = {
 356        regulator_desc_ldo1_low(1),
 357        regulator_desc_ldo_low(2),
 358        regulator_desc_ldo(3),
 359        regulator_desc_ldo(4),
 360        regulator_desc_ldo(5),
 361        regulator_desc_ldo_low(6),
 362        regulator_desc_ldo_low(7),
 363        regulator_desc_ldo_low(8),
 364        regulator_desc_ldo(9),
 365        regulator_desc_lpm_ldo(10),
 366        regulator_desc_lpm_ldo(11),
 367        regulator_desc_lpm_ldo(12),
 368        regulator_desc_ldo(13),
 369        regulator_desc_lpm_ldo(14),
 370        regulator_desc_ldo_low(15),
 371        regulator_desc_lpm_ldo(16),
 372        regulator_desc_ldo(17),
 373        regulator_desc_ldo(18),
 374        regulator_desc_ldo(19),
 375        regulator_desc_ldo(20),
 376        regulator_desc_ldo(21),
 377        regulator_desc_ldo(22),
 378        regulator_desc_ldo(23),
 379        regulator_desc_ldo(24),
 380        regulator_desc_ldo(25),
 381        regulator_desc_ldo(26),
 382        regulator_desc_buck1(1),
 383        regulator_desc_buck_dvs(2),
 384        regulator_desc_buck_dvs(3),
 385        regulator_desc_buck_dvs(4),
 386        regulator_desc_buck(5),
 387        regulator_desc_buck(6),
 388        regulator_desc_buck(7),
 389        regulator_desc_buck(8),
 390        regulator_desc_buck(9),
 391};
 392
 393#ifdef CONFIG_OF
 394static int max77686_pmic_dt_parse_pdata(struct platform_device *pdev,
 395                                        struct max77686_platform_data *pdata)
 396{
 397        struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 398        struct device_node *pmic_np, *regulators_np;
 399        struct max77686_regulator_data *rdata;
 400        struct of_regulator_match rmatch;
 401        unsigned int i;
 402
 403        pmic_np = iodev->dev->of_node;
 404        regulators_np = of_find_node_by_name(pmic_np, "voltage-regulators");
 405        if (!regulators_np) {
 406                dev_err(&pdev->dev, "could not find regulators sub-node\n");
 407                return -EINVAL;
 408        }
 409
 410        pdata->num_regulators = ARRAY_SIZE(regulators);
 411        rdata = devm_kzalloc(&pdev->dev, sizeof(*rdata) *
 412                             pdata->num_regulators, GFP_KERNEL);
 413        if (!rdata) {
 414                dev_err(&pdev->dev,
 415                        "could not allocate memory for regulator data\n");
 416                return -ENOMEM;
 417        }
 418
 419        for (i = 0; i < pdata->num_regulators; i++) {
 420                rmatch.name = regulators[i].name;
 421                rmatch.init_data = NULL;
 422                rmatch.of_node = NULL;
 423                of_regulator_match(&pdev->dev, regulators_np, &rmatch, 1);
 424                rdata[i].initdata = rmatch.init_data;
 425                rdata[i].of_node = rmatch.of_node;
 426        }
 427
 428        pdata->regulators = rdata;
 429
 430        return 0;
 431}
 432#else
 433static int max77686_pmic_dt_parse_pdata(struct platform_device *pdev,
 434                                        struct max77686_platform_data *pdata)
 435{
 436        return 0;
 437}
 438#endif /* CONFIG_OF */
 439
 440static int max77686_pmic_probe(struct platform_device *pdev)
 441{
 442        struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 443        struct max77686_platform_data *pdata = dev_get_platdata(iodev->dev);
 444        struct max77686_data *max77686;
 445        int i, ret = 0;
 446        struct regulator_config config = { };
 447
 448        dev_dbg(&pdev->dev, "%s\n", __func__);
 449
 450        if (!pdata) {
 451                dev_err(&pdev->dev, "no platform data found for regulator\n");
 452                return -ENODEV;
 453        }
 454
 455        if (iodev->dev->of_node) {
 456                ret = max77686_pmic_dt_parse_pdata(pdev, pdata);
 457                if (ret)
 458                        return ret;
 459        }
 460
 461        if (pdata->num_regulators != MAX77686_REGULATORS) {
 462                dev_err(&pdev->dev,
 463                        "Invalid initial data for regulator's initialiation\n");
 464                return -EINVAL;
 465        }
 466
 467        max77686 = devm_kzalloc(&pdev->dev, sizeof(struct max77686_data),
 468                                GFP_KERNEL);
 469        if (!max77686)
 470                return -ENOMEM;
 471
 472        config.dev = &pdev->dev;
 473        config.regmap = iodev->regmap;
 474        config.driver_data = max77686;
 475        platform_set_drvdata(pdev, max77686);
 476
 477        for (i = 0; i < MAX77686_REGULATORS; i++) {
 478                config.init_data = pdata->regulators[i].initdata;
 479                config.of_node = pdata->regulators[i].of_node;
 480
 481                max77686->opmode[i] = regulators[i].enable_mask;
 482                max77686->rdev[i] = regulator_register(&regulators[i], &config);
 483                if (IS_ERR(max77686->rdev[i])) {
 484                        ret = PTR_ERR(max77686->rdev[i]);
 485                        dev_err(&pdev->dev,
 486                                "regulator init failed for %d\n", i);
 487                        max77686->rdev[i] = NULL;
 488                        goto err;
 489                }
 490        }
 491
 492        return 0;
 493err:
 494        while (--i >= 0)
 495                regulator_unregister(max77686->rdev[i]);
 496        return ret;
 497}
 498
 499static int max77686_pmic_remove(struct platform_device *pdev)
 500{
 501        struct max77686_data *max77686 = platform_get_drvdata(pdev);
 502        int i;
 503
 504        for (i = 0; i < MAX77686_REGULATORS; i++)
 505                regulator_unregister(max77686->rdev[i]);
 506
 507        return 0;
 508}
 509
 510static const struct platform_device_id max77686_pmic_id[] = {
 511        {"max77686-pmic", 0},
 512        { },
 513};
 514MODULE_DEVICE_TABLE(platform, max77686_pmic_id);
 515
 516static struct platform_driver max77686_pmic_driver = {
 517        .driver = {
 518                .name = "max77686-pmic",
 519                .owner = THIS_MODULE,
 520        },
 521        .probe = max77686_pmic_probe,
 522        .remove = max77686_pmic_remove,
 523        .id_table = max77686_pmic_id,
 524};
 525
 526static int __init max77686_pmic_init(void)
 527{
 528        return platform_driver_register(&max77686_pmic_driver);
 529}
 530subsys_initcall(max77686_pmic_init);
 531
 532static void __exit max77686_pmic_cleanup(void)
 533{
 534        platform_driver_unregister(&max77686_pmic_driver);
 535}
 536module_exit(max77686_pmic_cleanup);
 537
 538MODULE_DESCRIPTION("MAXIM 77686 Regulator Driver");
 539MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>");
 540MODULE_LICENSE("GPL");
 541
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