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
  79        if (rdev->desc->id == MAX77686_BUCK1)
  80                val = 0x1;
  81        else
  82                val = 0x1 << MAX77686_OPMODE_BUCK234_SHIFT;
  83
  84        max77686->opmode[rdev->desc->id] = val;
  85        return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
  86                                  rdev->desc->enable_mask,
  87                                  val);
  88}
  89
  90/* Some LDOs supports [LPM/Normal]ON mode during suspend state */
  91static int max77686_set_suspend_mode(struct regulator_dev *rdev,
  92                                     unsigned int mode)
  93{
  94        struct max77686_data *max77686 = rdev_get_drvdata(rdev);
  95        unsigned int val;
  96
  97        /* BUCK[5-9] doesn't support this feature */
  98        if (rdev->desc->id >= MAX77686_BUCK5)
  99                return 0;
 100
 101        switch (mode) {
 102        case REGULATOR_MODE_IDLE:                       /* ON in LP Mode */
 103                val = 0x2 << MAX77686_OPMODE_SHIFT;
 104                break;
 105        case REGULATOR_MODE_NORMAL:                     /* ON in Normal Mode */
 106                val = 0x3 << MAX77686_OPMODE_SHIFT;
 107                break;
 108        default:
 109                pr_warn("%s: regulator_suspend_mode : 0x%x not supported\n",
 110                        rdev->desc->name, mode);
 111                return -EINVAL;
 112        }
 113
 114        max77686->opmode[rdev->desc->id] = val;
 115        return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 116                                  rdev->desc->enable_mask,
 117                                  val);
 118}
 119
 120/* Some LDOs supports LPM-ON/OFF/Normal-ON mode during suspend state */
 121static int max77686_ldo_set_suspend_mode(struct regulator_dev *rdev,
 122                                     unsigned int mode)
 123{
 124        unsigned int val;
 125        struct max77686_data *max77686 = rdev_get_drvdata(rdev);
 126
 127        switch (mode) {
 128        case REGULATOR_MODE_STANDBY:                    /* switch off */
 129                val = 0x1 << MAX77686_OPMODE_SHIFT;
 130                break;
 131        case REGULATOR_MODE_IDLE:                       /* ON in LP Mode */
 132                val = 0x2 << MAX77686_OPMODE_SHIFT;
 133                break;
 134        case REGULATOR_MODE_NORMAL:                     /* ON in Normal Mode */
 135                val = 0x3 << MAX77686_OPMODE_SHIFT;
 136                break;
 137        default:
 138                pr_warn("%s: regulator_suspend_mode : 0x%x not supported\n",
 139                        rdev->desc->name, mode);
 140                return -EINVAL;
 141        }
 142
 143        max77686->opmode[rdev->desc->id] = val;
 144        return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 145                                  rdev->desc->enable_mask,
 146                                  val);
 147}
 148
 149static int max77686_enable(struct regulator_dev *rdev)
 150{
 151        struct max77686_data *max77686 = rdev_get_drvdata(rdev);
 152
 153        return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 154                                  rdev->desc->enable_mask,
 155                                  max77686->opmode[rdev->desc->id]);
 156}
 157
 158static int max77686_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
 159{
 160        unsigned int ramp_value = RAMP_RATE_NO_CTRL;
 161
 162        switch (ramp_delay) {
 163        case 1 ... 13750:
 164                ramp_value = RAMP_RATE_13P75MV;
 165                break;
 166        case 13751 ... 27500:
 167                ramp_value = RAMP_RATE_27P5MV;
 168                break;
 169        case 27501 ... 55000:
 170                ramp_value = RAMP_RATE_55MV;
 171                break;
 172        case 55001 ... 100000:
 173                break;
 174        default:
 175                pr_warn("%s: ramp_delay: %d not supported, setting 100000\n",
 176                        rdev->desc->name, ramp_delay);
 177        }
 178
 179        return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 180                                  MAX77686_RAMP_RATE_MASK, ramp_value << 6);
 181}
 182
 183static struct regulator_ops max77686_ops = {
 184        .list_voltage           = regulator_list_voltage_linear,
 185        .map_voltage            = regulator_map_voltage_linear,
 186        .is_enabled             = regulator_is_enabled_regmap,
 187        .enable                 = max77686_enable,
 188        .disable                = regulator_disable_regmap,
 189        .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 190        .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 191        .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 192        .set_suspend_mode       = max77686_set_suspend_mode,
 193};
 194
 195static struct regulator_ops max77686_ldo_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_ldo_set_suspend_mode,
 205};
 206
 207static struct regulator_ops max77686_buck1_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_disable    = max77686_buck_set_suspend_disable,
 217};
 218
 219static struct regulator_ops max77686_buck_dvs_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_ramp_delay         = max77686_set_ramp_delay,
 229        .set_suspend_disable    = max77686_buck_set_suspend_disable,
 230};
 231
 232#define regulator_desc_ldo(num)         {                               \
 233        .name           = "LDO"#num,                                    \
 234        .id             = MAX77686_LDO##num,                            \
 235        .ops            = &max77686_ops,                                \
 236        .type           = REGULATOR_VOLTAGE,                            \
 237        .owner          = THIS_MODULE,                                  \
 238        .min_uV         = MAX77686_LDO_MINUV,                           \
 239        .uV_step        = MAX77686_LDO_UVSTEP,                          \
 240        .ramp_delay     = MAX77686_RAMP_DELAY,                          \
 241        .n_voltages     = MAX77686_VSEL_MASK + 1,                       \
 242        .vsel_reg       = MAX77686_REG_LDO1CTRL1 + num - 1,             \
 243        .vsel_mask      = MAX77686_VSEL_MASK,                           \
 244        .enable_reg     = MAX77686_REG_LDO1CTRL1 + num - 1,             \
 245        .enable_mask    = MAX77686_OPMODE_MASK                          \
 246                        << MAX77686_OPMODE_SHIFT,                       \
 247}
 248#define regulator_desc_lpm_ldo(num)     {                               \
 249        .name           = "LDO"#num,                                    \
 250        .id             = MAX77686_LDO##num,                            \
 251        .ops            = &max77686_ldo_ops,                            \
 252        .type           = REGULATOR_VOLTAGE,                            \
 253        .owner          = THIS_MODULE,                                  \
 254        .min_uV         = MAX77686_LDO_MINUV,                           \
 255        .uV_step        = MAX77686_LDO_UVSTEP,                          \
 256        .ramp_delay     = MAX77686_RAMP_DELAY,                          \
 257        .n_voltages     = MAX77686_VSEL_MASK + 1,                       \
 258        .vsel_reg       = MAX77686_REG_LDO1CTRL1 + num - 1,             \
 259        .vsel_mask      = MAX77686_VSEL_MASK,                           \
 260        .enable_reg     = MAX77686_REG_LDO1CTRL1 + num - 1,             \
 261        .enable_mask    = MAX77686_OPMODE_MASK                          \
 262                        << MAX77686_OPMODE_SHIFT,                       \
 263}
 264#define regulator_desc_ldo_low(num)             {                       \
 265        .name           = "LDO"#num,                                    \
 266        .id             = MAX77686_LDO##num,                            \
 267        .ops            = &max77686_ldo_ops,                            \
 268        .type           = REGULATOR_VOLTAGE,                            \
 269        .owner          = THIS_MODULE,                                  \
 270        .min_uV         = MAX77686_LDO_LOW_MINUV,                       \
 271        .uV_step        = MAX77686_LDO_LOW_UVSTEP,                      \
 272        .ramp_delay     = MAX77686_RAMP_DELAY,                          \
 273        .n_voltages     = MAX77686_VSEL_MASK + 1,                       \
 274        .vsel_reg       = MAX77686_REG_LDO1CTRL1 + num - 1,             \
 275        .vsel_mask      = MAX77686_VSEL_MASK,                           \
 276        .enable_reg     = MAX77686_REG_LDO1CTRL1 + num - 1,             \
 277        .enable_mask    = MAX77686_OPMODE_MASK                          \
 278                        << MAX77686_OPMODE_SHIFT,                       \
 279}
 280#define regulator_desc_ldo1_low(num)            {                       \
 281        .name           = "LDO"#num,                                    \
 282        .id             = MAX77686_LDO##num,                            \
 283        .ops            = &max77686_ops,                                \
 284        .type           = REGULATOR_VOLTAGE,                            \
 285        .owner          = THIS_MODULE,                                  \
 286        .min_uV         = MAX77686_LDO_LOW_MINUV,                       \
 287        .uV_step        = MAX77686_LDO_LOW_UVSTEP,                      \
 288        .ramp_delay     = MAX77686_RAMP_DELAY,                          \
 289        .n_voltages     = MAX77686_VSEL_MASK + 1,                       \
 290        .vsel_reg       = MAX77686_REG_LDO1CTRL1 + num - 1,             \
 291        .vsel_mask      = MAX77686_VSEL_MASK,                           \
 292        .enable_reg     = MAX77686_REG_LDO1CTRL1 + num - 1,             \
 293        .enable_mask    = MAX77686_OPMODE_MASK                          \
 294                        << MAX77686_OPMODE_SHIFT,                       \
 295}
 296#define regulator_desc_buck(num)                {                       \
 297        .name           = "BUCK"#num,                                   \
 298        .id             = MAX77686_BUCK##num,                           \
 299        .ops            = &max77686_ops,                                \
 300        .type           = REGULATOR_VOLTAGE,                            \
 301        .owner          = THIS_MODULE,                                  \
 302        .min_uV         = MAX77686_BUCK_MINUV,                          \
 303        .uV_step        = MAX77686_BUCK_UVSTEP,                         \
 304        .ramp_delay     = MAX77686_RAMP_DELAY,                          \
 305        .n_voltages     = MAX77686_VSEL_MASK + 1,                       \
 306        .vsel_reg       = MAX77686_REG_BUCK5OUT + (num - 5) * 2,        \
 307        .vsel_mask      = MAX77686_VSEL_MASK,                           \
 308        .enable_reg     = MAX77686_REG_BUCK5CTRL + (num - 5) * 2,       \
 309        .enable_mask    = MAX77686_OPMODE_MASK,                         \
 310}
 311#define regulator_desc_buck1(num)               {                       \
 312        .name           = "BUCK"#num,                                   \
 313        .id             = MAX77686_BUCK##num,                           \
 314        .ops            = &max77686_buck1_ops,                          \
 315        .type           = REGULATOR_VOLTAGE,                            \
 316        .owner          = THIS_MODULE,                                  \
 317        .min_uV         = MAX77686_BUCK_MINUV,                          \
 318        .uV_step        = MAX77686_BUCK_UVSTEP,                         \
 319        .ramp_delay     = MAX77686_RAMP_DELAY,                          \
 320        .n_voltages     = MAX77686_VSEL_MASK + 1,                       \
 321        .vsel_reg       = MAX77686_REG_BUCK1OUT,                        \
 322        .vsel_mask      = MAX77686_VSEL_MASK,                           \
 323        .enable_reg     = MAX77686_REG_BUCK1CTRL,                       \
 324        .enable_mask    = MAX77686_OPMODE_MASK,                         \
 325}
 326#define regulator_desc_buck_dvs(num)            {                       \
 327        .name           = "BUCK"#num,                                   \
 328        .id             = MAX77686_BUCK##num,                           \
 329        .ops            = &max77686_buck_dvs_ops,                       \
 330        .type           = REGULATOR_VOLTAGE,                            \
 331        .owner          = THIS_MODULE,                                  \
 332        .min_uV         = MAX77686_DVS_MINUV,                           \
 333        .uV_step        = MAX77686_DVS_UVSTEP,                          \
 334        .ramp_delay     = MAX77686_DVS_RAMP_DELAY,                      \
 335        .n_voltages     = MAX77686_DVS_VSEL_MASK + 1,                   \
 336        .vsel_reg       = MAX77686_REG_BUCK2DVS1 + (num - 2) * 10,      \
 337        .vsel_mask      = MAX77686_DVS_VSEL_MASK,                       \
 338        .enable_reg     = MAX77686_REG_BUCK2CTRL1 + (num - 2) * 10,     \
 339        .enable_mask    = MAX77686_OPMODE_MASK                          \
 340                        << MAX77686_OPMODE_BUCK234_SHIFT,               \
 341}
 342
 343static struct regulator_desc regulators[] = {
 344        regulator_desc_ldo1_low(1),
 345        regulator_desc_ldo_low(2),
 346        regulator_desc_ldo(3),
 347        regulator_desc_ldo(4),
 348        regulator_desc_ldo(5),
 349        regulator_desc_ldo_low(6),
 350        regulator_desc_ldo_low(7),
 351        regulator_desc_ldo_low(8),
 352        regulator_desc_ldo(9),
 353        regulator_desc_lpm_ldo(10),
 354        regulator_desc_lpm_ldo(11),
 355        regulator_desc_lpm_ldo(12),
 356        regulator_desc_ldo(13),
 357        regulator_desc_lpm_ldo(14),
 358        regulator_desc_ldo_low(15),
 359        regulator_desc_lpm_ldo(16),
 360        regulator_desc_ldo(17),
 361        regulator_desc_ldo(18),
 362        regulator_desc_ldo(19),
 363        regulator_desc_ldo(20),
 364        regulator_desc_ldo(21),
 365        regulator_desc_ldo(22),
 366        regulator_desc_ldo(23),
 367        regulator_desc_ldo(24),
 368        regulator_desc_ldo(25),
 369        regulator_desc_ldo(26),
 370        regulator_desc_buck1(1),
 371        regulator_desc_buck_dvs(2),
 372        regulator_desc_buck_dvs(3),
 373        regulator_desc_buck_dvs(4),
 374        regulator_desc_buck(5),
 375        regulator_desc_buck(6),
 376        regulator_desc_buck(7),
 377        regulator_desc_buck(8),
 378        regulator_desc_buck(9),
 379};
 380
 381#ifdef CONFIG_OF
 382static int max77686_pmic_dt_parse_pdata(struct platform_device *pdev,
 383                                        struct max77686_platform_data *pdata)
 384{
 385        struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 386        struct device_node *pmic_np, *regulators_np;
 387        struct max77686_regulator_data *rdata;
 388        struct of_regulator_match rmatch;
 389        unsigned int i;
 390
 391        pmic_np = iodev->dev->of_node;
 392        regulators_np = of_find_node_by_name(pmic_np, "voltage-regulators");
 393        if (!regulators_np) {
 394                dev_err(&pdev->dev, "could not find regulators sub-node\n");
 395                return -EINVAL;
 396        }
 397
 398        pdata->num_regulators = ARRAY_SIZE(regulators);
 399        rdata = devm_kzalloc(&pdev->dev, sizeof(*rdata) *
 400                             pdata->num_regulators, GFP_KERNEL);
 401        if (!rdata) {
 402                dev_err(&pdev->dev,
 403                        "could not allocate memory for regulator data\n");
 404                return -ENOMEM;
 405        }
 406
 407        for (i = 0; i < pdata->num_regulators; i++) {
 408                rmatch.name = regulators[i].name;
 409                rmatch.init_data = NULL;
 410                rmatch.of_node = NULL;
 411                of_regulator_match(&pdev->dev, regulators_np, &rmatch, 1);
 412                rdata[i].initdata = rmatch.init_data;
 413                rdata[i].of_node = rmatch.of_node;
 414        }
 415
 416        pdata->regulators = rdata;
 417
 418        return 0;
 419}
 420#else
 421static int max77686_pmic_dt_parse_pdata(struct platform_device *pdev,
 422                                        struct max77686_platform_data *pdata)
 423{
 424        return 0;
 425}
 426#endif /* CONFIG_OF */
 427
 428static int max77686_pmic_probe(struct platform_device *pdev)
 429{
 430        struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 431        struct max77686_platform_data *pdata = dev_get_platdata(iodev->dev);
 432        struct max77686_data *max77686;
 433        int i, ret = 0;
 434        struct regulator_config config = { };
 435
 436        dev_dbg(&pdev->dev, "%s\n", __func__);
 437
 438        if (!pdata) {
 439                dev_err(&pdev->dev, "no platform data found for regulator\n");
 440                return -ENODEV;
 441        }
 442
 443        if (iodev->dev->of_node) {
 444                ret = max77686_pmic_dt_parse_pdata(pdev, pdata);
 445                if (ret)
 446                        return ret;
 447        }
 448
 449        if (pdata->num_regulators != MAX77686_REGULATORS) {
 450                dev_err(&pdev->dev,
 451                        "Invalid initial data for regulator's initialiation\n");
 452                return -EINVAL;
 453        }
 454
 455        max77686 = devm_kzalloc(&pdev->dev, sizeof(struct max77686_data),
 456                                GFP_KERNEL);
 457        if (!max77686)
 458                return -ENOMEM;
 459
 460        config.dev = &pdev->dev;
 461        config.regmap = iodev->regmap;
 462        config.driver_data = max77686;
 463        platform_set_drvdata(pdev, max77686);
 464
 465        for (i = 0; i < MAX77686_REGULATORS; i++) {
 466                config.init_data = pdata->regulators[i].initdata;
 467                config.of_node = pdata->regulators[i].of_node;
 468
 469                max77686->opmode[i] = regulators[i].enable_mask;
 470                max77686->rdev[i] = regulator_register(&regulators[i], &config);
 471                if (IS_ERR(max77686->rdev[i])) {
 472                        ret = PTR_ERR(max77686->rdev[i]);
 473                        dev_err(&pdev->dev,
 474                                "regulator init failed for %d\n", i);
 475                        max77686->rdev[i] = NULL;
 476                        goto err;
 477                }
 478        }
 479
 480        return 0;
 481err:
 482        while (--i >= 0)
 483                regulator_unregister(max77686->rdev[i]);
 484        return ret;
 485}
 486
 487static int max77686_pmic_remove(struct platform_device *pdev)
 488{
 489        struct max77686_data *max77686 = platform_get_drvdata(pdev);
 490        int i;
 491
 492        for (i = 0; i < MAX77686_REGULATORS; i++)
 493                regulator_unregister(max77686->rdev[i]);
 494
 495        return 0;
 496}
 497
 498static const struct platform_device_id max77686_pmic_id[] = {
 499        {"max77686-pmic", 0},
 500        { },
 501};
 502MODULE_DEVICE_TABLE(platform, max77686_pmic_id);
 503
 504static struct platform_driver max77686_pmic_driver = {
 505        .driver = {
 506                .name = "max77686-pmic",
 507                .owner = THIS_MODULE,
 508        },
 509        .probe = max77686_pmic_probe,
 510        .remove = max77686_pmic_remove,
 511        .id_table = max77686_pmic_id,
 512};
 513
 514static int __init max77686_pmic_init(void)
 515{
 516        return platform_driver_register(&max77686_pmic_driver);
 517}
 518subsys_initcall(max77686_pmic_init);
 519
 520static void __exit max77686_pmic_cleanup(void)
 521{
 522        platform_driver_unregister(&max77686_pmic_driver);
 523}
 524module_exit(max77686_pmic_cleanup);
 525
 526MODULE_DESCRIPTION("MAXIM 77686 Regulator Driver");
 527MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>");
 528MODULE_LICENSE("GPL");
 529
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