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 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        max77686->opmode[id] = val;
  86        return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
  87                                  rdev->desc->enable_mask,
  88                                  val);
  89}
  90
  91/* Some LDOs supports [LPM/Normal]ON mode during suspend state */
  92static int max77686_set_suspend_mode(struct regulator_dev *rdev,
  93                                     unsigned int mode)
  94{
  95        struct max77686_data *max77686 = rdev_get_drvdata(rdev);
  96        unsigned int val;
  97        int id = rdev_get_id(rdev);
  98
  99        /* BUCK[5-9] doesn't support this feature */
 100        if (id >= MAX77686_BUCK5)
 101                return 0;
 102
 103        switch (mode) {
 104        case REGULATOR_MODE_IDLE:                       /* ON in LP Mode */
 105                val = 0x2 << MAX77686_OPMODE_SHIFT;
 106                break;
 107        case REGULATOR_MODE_NORMAL:                     /* ON in Normal Mode */
 108                val = 0x3 << MAX77686_OPMODE_SHIFT;
 109                break;
 110        default:
 111                pr_warn("%s: regulator_suspend_mode : 0x%x not supported\n",
 112                        rdev->desc->name, mode);
 113                return -EINVAL;
 114        }
 115
 116        max77686->opmode[id] = val;
 117        return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 118                                  rdev->desc->enable_mask,
 119                                  val);
 120}
 121
 122/* Some LDOs supports LPM-ON/OFF/Normal-ON mode during suspend state */
 123static int max77686_ldo_set_suspend_mode(struct regulator_dev *rdev,
 124                                     unsigned int mode)
 125{
 126        unsigned int val;
 127        struct max77686_data *max77686 = rdev_get_drvdata(rdev);
 128
 129        switch (mode) {
 130        case REGULATOR_MODE_STANDBY:                    /* switch off */
 131                val = 0x1 << MAX77686_OPMODE_SHIFT;
 132                break;
 133        case REGULATOR_MODE_IDLE:                       /* ON in LP Mode */
 134                val = 0x2 << MAX77686_OPMODE_SHIFT;
 135                break;
 136        case REGULATOR_MODE_NORMAL:                     /* ON in Normal Mode */
 137                val = 0x3 << MAX77686_OPMODE_SHIFT;
 138                break;
 139        default:
 140                pr_warn("%s: regulator_suspend_mode : 0x%x not supported\n",
 141                        rdev->desc->name, mode);
 142                return -EINVAL;
 143        }
 144
 145        max77686->opmode[rdev_get_id(rdev)] = val;
 146        return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 147                                  rdev->desc->enable_mask,
 148                                  val);
 149}
 150
 151static int max77686_enable(struct regulator_dev *rdev)
 152{
 153        struct max77686_data *max77686 = rdev_get_drvdata(rdev);
 154
 155        return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 156                                  rdev->desc->enable_mask,
 157                                  max77686->opmode[rdev_get_id(rdev)]);
 158}
 159
 160static int max77686_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
 161{
 162        unsigned int ramp_value = RAMP_RATE_NO_CTRL;
 163
 164        switch (ramp_delay) {
 165        case 1 ... 13750:
 166                ramp_value = RAMP_RATE_13P75MV;
 167                break;
 168        case 13751 ... 27500:
 169                ramp_value = RAMP_RATE_27P5MV;
 170                break;
 171        case 27501 ... 55000:
 172                ramp_value = RAMP_RATE_55MV;
 173                break;
 174        case 55001 ... 100000:
 175                break;
 176        default:
 177                pr_warn("%s: ramp_delay: %d not supported, setting 100000\n",
 178                        rdev->desc->name, ramp_delay);
 179        }
 180
 181        return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 182                                  MAX77686_RAMP_RATE_MASK, ramp_value << 6);
 183}
 184
 185static struct regulator_ops max77686_ops = {
 186        .list_voltage           = regulator_list_voltage_linear,
 187        .map_voltage            = regulator_map_voltage_linear,
 188        .is_enabled             = regulator_is_enabled_regmap,
 189        .enable                 = max77686_enable,
 190        .disable                = regulator_disable_regmap,
 191        .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 192        .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 193        .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 194        .set_suspend_mode       = max77686_set_suspend_mode,
 195};
 196
 197static struct regulator_ops max77686_ldo_ops = {
 198        .list_voltage           = regulator_list_voltage_linear,
 199        .map_voltage            = regulator_map_voltage_linear,
 200        .is_enabled             = regulator_is_enabled_regmap,
 201        .enable                 = max77686_enable,
 202        .disable                = regulator_disable_regmap,
 203        .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 204        .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 205        .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 206        .set_suspend_mode       = max77686_ldo_set_suspend_mode,
 207};
 208
 209static struct regulator_ops max77686_buck1_ops = {
 210        .list_voltage           = regulator_list_voltage_linear,
 211        .map_voltage            = regulator_map_voltage_linear,
 212        .is_enabled             = regulator_is_enabled_regmap,
 213        .enable                 = max77686_enable,
 214        .disable                = regulator_disable_regmap,
 215        .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 216        .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 217        .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 218        .set_suspend_disable    = max77686_buck_set_suspend_disable,
 219};
 220
 221static struct regulator_ops max77686_buck_dvs_ops = {
 222        .list_voltage           = regulator_list_voltage_linear,
 223        .map_voltage            = regulator_map_voltage_linear,
 224        .is_enabled             = regulator_is_enabled_regmap,
 225        .enable                 = max77686_enable,
 226        .disable                = regulator_disable_regmap,
 227        .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 228        .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 229        .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 230        .set_ramp_delay         = max77686_set_ramp_delay,
 231        .set_suspend_disable    = max77686_buck_set_suspend_disable,
 232};
 233
 234#define regulator_desc_ldo(num)         {                               \
 235        .name           = "LDO"#num,                                    \
 236        .id             = MAX77686_LDO##num,                            \
 237        .ops            = &max77686_ops,                                \
 238        .type           = REGULATOR_VOLTAGE,                            \
 239        .owner          = THIS_MODULE,                                  \
 240        .min_uV         = MAX77686_LDO_MINUV,                           \
 241        .uV_step        = MAX77686_LDO_UVSTEP,                          \
 242        .ramp_delay     = MAX77686_RAMP_DELAY,                          \
 243        .n_voltages     = MAX77686_VSEL_MASK + 1,                       \
 244        .vsel_reg       = MAX77686_REG_LDO1CTRL1 + num - 1,             \
 245        .vsel_mask      = MAX77686_VSEL_MASK,                           \
 246        .enable_reg     = MAX77686_REG_LDO1CTRL1 + num - 1,             \
 247        .enable_mask    = MAX77686_OPMODE_MASK                          \
 248                        << MAX77686_OPMODE_SHIFT,                       \
 249}
 250#define regulator_desc_lpm_ldo(num)     {                               \
 251        .name           = "LDO"#num,                                    \
 252        .id             = MAX77686_LDO##num,                            \
 253        .ops            = &max77686_ldo_ops,                            \
 254        .type           = REGULATOR_VOLTAGE,                            \
 255        .owner          = THIS_MODULE,                                  \
 256        .min_uV         = MAX77686_LDO_MINUV,                           \
 257        .uV_step        = MAX77686_LDO_UVSTEP,                          \
 258        .ramp_delay     = MAX77686_RAMP_DELAY,                          \
 259        .n_voltages     = MAX77686_VSEL_MASK + 1,                       \
 260        .vsel_reg       = MAX77686_REG_LDO1CTRL1 + num - 1,             \
 261        .vsel_mask      = MAX77686_VSEL_MASK,                           \
 262        .enable_reg     = MAX77686_REG_LDO1CTRL1 + num - 1,             \
 263        .enable_mask    = MAX77686_OPMODE_MASK                          \
 264                        << MAX77686_OPMODE_SHIFT,                       \
 265}
 266#define regulator_desc_ldo_low(num)             {                       \
 267        .name           = "LDO"#num,                                    \
 268        .id             = MAX77686_LDO##num,                            \
 269        .ops            = &max77686_ldo_ops,                            \
 270        .type           = REGULATOR_VOLTAGE,                            \
 271        .owner          = THIS_MODULE,                                  \
 272        .min_uV         = MAX77686_LDO_LOW_MINUV,                       \
 273        .uV_step        = MAX77686_LDO_LOW_UVSTEP,                      \
 274        .ramp_delay     = MAX77686_RAMP_DELAY,                          \
 275        .n_voltages     = MAX77686_VSEL_MASK + 1,                       \
 276        .vsel_reg       = MAX77686_REG_LDO1CTRL1 + num - 1,             \
 277        .vsel_mask      = MAX77686_VSEL_MASK,                           \
 278        .enable_reg     = MAX77686_REG_LDO1CTRL1 + num - 1,             \
 279        .enable_mask    = MAX77686_OPMODE_MASK                          \
 280                        << MAX77686_OPMODE_SHIFT,                       \
 281}
 282#define regulator_desc_ldo1_low(num)            {                       \
 283        .name           = "LDO"#num,                                    \
 284        .id             = MAX77686_LDO##num,                            \
 285        .ops            = &max77686_ops,                                \
 286        .type           = REGULATOR_VOLTAGE,                            \
 287        .owner          = THIS_MODULE,                                  \
 288        .min_uV         = MAX77686_LDO_LOW_MINUV,                       \
 289        .uV_step        = MAX77686_LDO_LOW_UVSTEP,                      \
 290        .ramp_delay     = MAX77686_RAMP_DELAY,                          \
 291        .n_voltages     = MAX77686_VSEL_MASK + 1,                       \
 292        .vsel_reg       = MAX77686_REG_LDO1CTRL1 + num - 1,             \
 293        .vsel_mask      = MAX77686_VSEL_MASK,                           \
 294        .enable_reg     = MAX77686_REG_LDO1CTRL1 + num - 1,             \
 295        .enable_mask    = MAX77686_OPMODE_MASK                          \
 296                        << MAX77686_OPMODE_SHIFT,                       \
 297}
 298#define regulator_desc_buck(num)                {                       \
 299        .name           = "BUCK"#num,                                   \
 300        .id             = MAX77686_BUCK##num,                           \
 301        .ops            = &max77686_ops,                                \
 302        .type           = REGULATOR_VOLTAGE,                            \
 303        .owner          = THIS_MODULE,                                  \
 304        .min_uV         = MAX77686_BUCK_MINUV,                          \
 305        .uV_step        = MAX77686_BUCK_UVSTEP,                         \
 306        .ramp_delay     = MAX77686_RAMP_DELAY,                          \
 307        .n_voltages     = MAX77686_VSEL_MASK + 1,                       \
 308        .vsel_reg       = MAX77686_REG_BUCK5OUT + (num - 5) * 2,        \
 309        .vsel_mask      = MAX77686_VSEL_MASK,                           \
 310        .enable_reg     = MAX77686_REG_BUCK5CTRL + (num - 5) * 2,       \
 311        .enable_mask    = MAX77686_OPMODE_MASK,                         \
 312}
 313#define regulator_desc_buck1(num)               {                       \
 314        .name           = "BUCK"#num,                                   \
 315        .id             = MAX77686_BUCK##num,                           \
 316        .ops            = &max77686_buck1_ops,                          \
 317        .type           = REGULATOR_VOLTAGE,                            \
 318        .owner          = THIS_MODULE,                                  \
 319        .min_uV         = MAX77686_BUCK_MINUV,                          \
 320        .uV_step        = MAX77686_BUCK_UVSTEP,                         \
 321        .ramp_delay     = MAX77686_RAMP_DELAY,                          \
 322        .n_voltages     = MAX77686_VSEL_MASK + 1,                       \
 323        .vsel_reg       = MAX77686_REG_BUCK1OUT,                        \
 324        .vsel_mask      = MAX77686_VSEL_MASK,                           \
 325        .enable_reg     = MAX77686_REG_BUCK1CTRL,                       \
 326        .enable_mask    = MAX77686_OPMODE_MASK,                         \
 327}
 328#define regulator_desc_buck_dvs(num)            {                       \
 329        .name           = "BUCK"#num,                                   \
 330        .id             = MAX77686_BUCK##num,                           \
 331        .ops            = &max77686_buck_dvs_ops,                       \
 332        .type           = REGULATOR_VOLTAGE,                            \
 333        .owner          = THIS_MODULE,                                  \
 334        .min_uV         = MAX77686_DVS_MINUV,                           \
 335        .uV_step        = MAX77686_DVS_UVSTEP,                          \
 336        .ramp_delay     = MAX77686_DVS_RAMP_DELAY,                      \
 337        .n_voltages     = MAX77686_DVS_VSEL_MASK + 1,                   \
 338        .vsel_reg       = MAX77686_REG_BUCK2DVS1 + (num - 2) * 10,      \
 339        .vsel_mask      = MAX77686_DVS_VSEL_MASK,                       \
 340        .enable_reg     = MAX77686_REG_BUCK2CTRL1 + (num - 2) * 10,     \
 341        .enable_mask    = MAX77686_OPMODE_MASK                          \
 342                        << MAX77686_OPMODE_BUCK234_SHIFT,               \
 343}
 344
 345static struct regulator_desc regulators[] = {
 346        regulator_desc_ldo1_low(1),
 347        regulator_desc_ldo_low(2),
 348        regulator_desc_ldo(3),
 349        regulator_desc_ldo(4),
 350        regulator_desc_ldo(5),
 351        regulator_desc_ldo_low(6),
 352        regulator_desc_ldo_low(7),
 353        regulator_desc_ldo_low(8),
 354        regulator_desc_ldo(9),
 355        regulator_desc_lpm_ldo(10),
 356        regulator_desc_lpm_ldo(11),
 357        regulator_desc_lpm_ldo(12),
 358        regulator_desc_ldo(13),
 359        regulator_desc_lpm_ldo(14),
 360        regulator_desc_ldo_low(15),
 361        regulator_desc_lpm_ldo(16),
 362        regulator_desc_ldo(17),
 363        regulator_desc_ldo(18),
 364        regulator_desc_ldo(19),
 365        regulator_desc_ldo(20),
 366        regulator_desc_ldo(21),
 367        regulator_desc_ldo(22),
 368        regulator_desc_ldo(23),
 369        regulator_desc_ldo(24),
 370        regulator_desc_ldo(25),
 371        regulator_desc_ldo(26),
 372        regulator_desc_buck1(1),
 373        regulator_desc_buck_dvs(2),
 374        regulator_desc_buck_dvs(3),
 375        regulator_desc_buck_dvs(4),
 376        regulator_desc_buck(5),
 377        regulator_desc_buck(6),
 378        regulator_desc_buck(7),
 379        regulator_desc_buck(8),
 380        regulator_desc_buck(9),
 381};
 382
 383#ifdef CONFIG_OF
 384static int max77686_pmic_dt_parse_pdata(struct platform_device *pdev,
 385                                        struct max77686_platform_data *pdata)
 386{
 387        struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 388        struct device_node *pmic_np, *regulators_np;
 389        struct max77686_regulator_data *rdata;
 390        struct of_regulator_match rmatch;
 391        unsigned int i;
 392
 393        pmic_np = iodev->dev->of_node;
 394        regulators_np = of_find_node_by_name(pmic_np, "voltage-regulators");
 395        if (!regulators_np) {
 396                dev_err(&pdev->dev, "could not find regulators sub-node\n");
 397                return -EINVAL;
 398        }
 399
 400        pdata->num_regulators = ARRAY_SIZE(regulators);
 401        rdata = devm_kzalloc(&pdev->dev, sizeof(*rdata) *
 402                             pdata->num_regulators, GFP_KERNEL);
 403        if (!rdata) {
 404                dev_err(&pdev->dev,
 405                        "could not allocate memory for regulator data\n");
 406                return -ENOMEM;
 407        }
 408
 409        for (i = 0; i < pdata->num_regulators; i++) {
 410                rmatch.name = regulators[i].name;
 411                rmatch.init_data = NULL;
 412                rmatch.of_node = NULL;
 413                of_regulator_match(&pdev->dev, regulators_np, &rmatch, 1);
 414                rdata[i].initdata = rmatch.init_data;
 415                rdata[i].of_node = rmatch.of_node;
 416        }
 417
 418        pdata->regulators = rdata;
 419
 420        return 0;
 421}
 422#else
 423static int max77686_pmic_dt_parse_pdata(struct platform_device *pdev,
 424                                        struct max77686_platform_data *pdata)
 425{
 426        return 0;
 427}
 428#endif /* CONFIG_OF */
 429
 430static int max77686_pmic_probe(struct platform_device *pdev)
 431{
 432        struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 433        struct max77686_platform_data *pdata = dev_get_platdata(iodev->dev);
 434        struct max77686_data *max77686;
 435        int i, ret = 0;
 436        struct regulator_config config = { };
 437
 438        dev_dbg(&pdev->dev, "%s\n", __func__);
 439
 440        if (!pdata) {
 441                dev_err(&pdev->dev, "no platform data found for regulator\n");
 442                return -ENODEV;
 443        }
 444
 445        if (iodev->dev->of_node) {
 446                ret = max77686_pmic_dt_parse_pdata(pdev, pdata);
 447                if (ret)
 448                        return ret;
 449        }
 450
 451        if (pdata->num_regulators != MAX77686_REGULATORS) {
 452                dev_err(&pdev->dev,
 453                        "Invalid initial data for regulator's initialiation\n");
 454                return -EINVAL;
 455        }
 456
 457        max77686 = devm_kzalloc(&pdev->dev, sizeof(struct max77686_data),
 458                                GFP_KERNEL);
 459        if (!max77686)
 460                return -ENOMEM;
 461
 462        config.dev = &pdev->dev;
 463        config.regmap = iodev->regmap;
 464        config.driver_data = max77686;
 465        platform_set_drvdata(pdev, max77686);
 466
 467        for (i = 0; i < MAX77686_REGULATORS; i++) {
 468                config.init_data = pdata->regulators[i].initdata;
 469                config.of_node = pdata->regulators[i].of_node;
 470
 471                max77686->opmode[i] = regulators[i].enable_mask;
 472                max77686->rdev[i] = regulator_register(&regulators[i], &config);
 473                if (IS_ERR(max77686->rdev[i])) {
 474                        ret = PTR_ERR(max77686->rdev[i]);
 475                        dev_err(&pdev->dev,
 476                                "regulator init failed for %d\n", i);
 477                        max77686->rdev[i] = NULL;
 478                        goto err;
 479                }
 480        }
 481
 482        return 0;
 483err:
 484        while (--i >= 0)
 485                regulator_unregister(max77686->rdev[i]);
 486        return ret;
 487}
 488
 489static int max77686_pmic_remove(struct platform_device *pdev)
 490{
 491        struct max77686_data *max77686 = platform_get_drvdata(pdev);
 492        int i;
 493
 494        for (i = 0; i < MAX77686_REGULATORS; i++)
 495                regulator_unregister(max77686->rdev[i]);
 496
 497        return 0;
 498}
 499
 500static const struct platform_device_id max77686_pmic_id[] = {
 501        {"max77686-pmic", 0},
 502        { },
 503};
 504MODULE_DEVICE_TABLE(platform, max77686_pmic_id);
 505
 506static struct platform_driver max77686_pmic_driver = {
 507        .driver = {
 508                .name = "max77686-pmic",
 509                .owner = THIS_MODULE,
 510        },
 511        .probe = max77686_pmic_probe,
 512        .remove = max77686_pmic_remove,
 513        .id_table = max77686_pmic_id,
 514};
 515
 516static int __init max77686_pmic_init(void)
 517{
 518        return platform_driver_register(&max77686_pmic_driver);
 519}
 520subsys_initcall(max77686_pmic_init);
 521
 522static void __exit max77686_pmic_cleanup(void)
 523{
 524        platform_driver_unregister(&max77686_pmic_driver);
 525}
 526module_exit(max77686_pmic_cleanup);
 527
 528MODULE_DESCRIPTION("MAXIM 77686 Regulator Driver");
 529MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>");
 530MODULE_LICENSE("GPL");
 531
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