linux/drivers/regulator/max8997-regulator.c
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   1/*
   2 * max8997.c - Regulator driver for the Maxim 8997/8966
   3 *
   4 * Copyright (C) 2011 Samsung Electronics
   5 * MyungJoo Ham <myungjoo.ham@samsung.com>
   6 *
   7 * This program is free software; you can redistribute it and/or modify
   8 * it under the terms of the GNU General Public License as published by
   9 * the Free Software Foundation; either version 2 of the License, or
  10 * (at your option) any later version.
  11 *
  12 * This program is distributed in the hope that it will be useful,
  13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 * GNU General Public License for more details.
  16 *
  17 * You should have received a copy of the GNU General Public License
  18 * along with this program; if not, write to the Free Software
  19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20 *
  21 * This driver is based on max8998.c
  22 */
  23
  24#include <linux/bug.h>
  25#include <linux/err.h>
  26#include <linux/gpio.h>
  27#include <linux/of_gpio.h>
  28#include <linux/slab.h>
  29#include <linux/module.h>
  30#include <linux/platform_device.h>
  31#include <linux/regulator/driver.h>
  32#include <linux/regulator/machine.h>
  33#include <linux/mfd/max8997.h>
  34#include <linux/mfd/max8997-private.h>
  35#include <linux/regulator/of_regulator.h>
  36
  37struct max8997_data {
  38        struct device *dev;
  39        struct max8997_dev *iodev;
  40        int num_regulators;
  41        int ramp_delay; /* in mV/us */
  42
  43        bool buck1_gpiodvs;
  44        bool buck2_gpiodvs;
  45        bool buck5_gpiodvs;
  46        u8 buck1_vol[8];
  47        u8 buck2_vol[8];
  48        u8 buck5_vol[8];
  49        int buck125_gpios[3];
  50        int buck125_gpioindex;
  51        bool ignore_gpiodvs_side_effect;
  52
  53        u8 saved_states[MAX8997_REG_MAX];
  54};
  55
  56static const unsigned int safeoutvolt[] = {
  57        4850000,
  58        4900000,
  59        4950000,
  60        3300000,
  61};
  62
  63static inline void max8997_set_gpio(struct max8997_data *max8997)
  64{
  65        int set3 = (max8997->buck125_gpioindex) & 0x1;
  66        int set2 = ((max8997->buck125_gpioindex) >> 1) & 0x1;
  67        int set1 = ((max8997->buck125_gpioindex) >> 2) & 0x1;
  68
  69        gpio_set_value(max8997->buck125_gpios[0], set1);
  70        gpio_set_value(max8997->buck125_gpios[1], set2);
  71        gpio_set_value(max8997->buck125_gpios[2], set3);
  72}
  73
  74struct voltage_map_desc {
  75        int min;
  76        int max;
  77        int step;
  78};
  79
  80/* Voltage maps in uV */
  81static const struct voltage_map_desc ldo_voltage_map_desc = {
  82        .min = 800000,  .max = 3950000, .step = 50000,
  83}; /* LDO1 ~ 18, 21 all */
  84
  85static const struct voltage_map_desc buck1245_voltage_map_desc = {
  86        .min = 650000,  .max = 2225000, .step = 25000,
  87}; /* Buck1, 2, 4, 5 */
  88
  89static const struct voltage_map_desc buck37_voltage_map_desc = {
  90        .min = 750000,  .max = 3900000, .step = 50000,
  91}; /* Buck3, 7 */
  92
  93/* current map in uA */
  94static const struct voltage_map_desc charger_current_map_desc = {
  95        .min = 200000,  .max = 950000,  .step = 50000,
  96};
  97
  98static const struct voltage_map_desc topoff_current_map_desc = {
  99        .min = 50000,   .max = 200000,  .step = 10000,
 100};
 101
 102static const struct voltage_map_desc *reg_voltage_map[] = {
 103        [MAX8997_LDO1] = &ldo_voltage_map_desc,
 104        [MAX8997_LDO2] = &ldo_voltage_map_desc,
 105        [MAX8997_LDO3] = &ldo_voltage_map_desc,
 106        [MAX8997_LDO4] = &ldo_voltage_map_desc,
 107        [MAX8997_LDO5] = &ldo_voltage_map_desc,
 108        [MAX8997_LDO6] = &ldo_voltage_map_desc,
 109        [MAX8997_LDO7] = &ldo_voltage_map_desc,
 110        [MAX8997_LDO8] = &ldo_voltage_map_desc,
 111        [MAX8997_LDO9] = &ldo_voltage_map_desc,
 112        [MAX8997_LDO10] = &ldo_voltage_map_desc,
 113        [MAX8997_LDO11] = &ldo_voltage_map_desc,
 114        [MAX8997_LDO12] = &ldo_voltage_map_desc,
 115        [MAX8997_LDO13] = &ldo_voltage_map_desc,
 116        [MAX8997_LDO14] = &ldo_voltage_map_desc,
 117        [MAX8997_LDO15] = &ldo_voltage_map_desc,
 118        [MAX8997_LDO16] = &ldo_voltage_map_desc,
 119        [MAX8997_LDO17] = &ldo_voltage_map_desc,
 120        [MAX8997_LDO18] = &ldo_voltage_map_desc,
 121        [MAX8997_LDO21] = &ldo_voltage_map_desc,
 122        [MAX8997_BUCK1] = &buck1245_voltage_map_desc,
 123        [MAX8997_BUCK2] = &buck1245_voltage_map_desc,
 124        [MAX8997_BUCK3] = &buck37_voltage_map_desc,
 125        [MAX8997_BUCK4] = &buck1245_voltage_map_desc,
 126        [MAX8997_BUCK5] = &buck1245_voltage_map_desc,
 127        [MAX8997_BUCK6] = NULL,
 128        [MAX8997_BUCK7] = &buck37_voltage_map_desc,
 129        [MAX8997_EN32KHZ_AP] = NULL,
 130        [MAX8997_EN32KHZ_CP] = NULL,
 131        [MAX8997_ENVICHG] = NULL,
 132        [MAX8997_ESAFEOUT1] = NULL,
 133        [MAX8997_ESAFEOUT2] = NULL,
 134        [MAX8997_CHARGER_CV] = NULL,
 135        [MAX8997_CHARGER] = &charger_current_map_desc,
 136        [MAX8997_CHARGER_TOPOFF] = &topoff_current_map_desc,
 137};
 138
 139static int max8997_list_voltage_charger_cv(struct regulator_dev *rdev,
 140                unsigned int selector)
 141{
 142        int rid = rdev_get_id(rdev);
 143
 144        if (rid != MAX8997_CHARGER_CV)
 145                goto err;
 146
 147        switch (selector) {
 148        case 0x00:
 149                return 4200000;
 150        case 0x01 ... 0x0E:
 151                return 4000000 + 20000 * (selector - 0x01);
 152        case 0x0F:
 153                return 4350000;
 154        default:
 155                return -EINVAL;
 156        }
 157err:
 158        return -EINVAL;
 159}
 160
 161static int max8997_list_voltage(struct regulator_dev *rdev,
 162                unsigned int selector)
 163{
 164        const struct voltage_map_desc *desc;
 165        int rid = rdev_get_id(rdev);
 166        int val;
 167
 168        if (rid >= ARRAY_SIZE(reg_voltage_map) ||
 169                        rid < 0)
 170                return -EINVAL;
 171
 172        desc = reg_voltage_map[rid];
 173        if (desc == NULL)
 174                return -EINVAL;
 175
 176        val = desc->min + desc->step * selector;
 177        if (val > desc->max)
 178                return -EINVAL;
 179
 180        return val;
 181}
 182
 183static int max8997_get_enable_register(struct regulator_dev *rdev,
 184                int *reg, int *mask, int *pattern)
 185{
 186        int rid = rdev_get_id(rdev);
 187
 188        switch (rid) {
 189        case MAX8997_LDO1 ... MAX8997_LDO21:
 190                *reg = MAX8997_REG_LDO1CTRL + (rid - MAX8997_LDO1);
 191                *mask = 0xC0;
 192                *pattern = 0xC0;
 193                break;
 194        case MAX8997_BUCK1:
 195                *reg = MAX8997_REG_BUCK1CTRL;
 196                *mask = 0x01;
 197                *pattern = 0x01;
 198                break;
 199        case MAX8997_BUCK2:
 200                *reg = MAX8997_REG_BUCK2CTRL;
 201                *mask = 0x01;
 202                *pattern = 0x01;
 203                break;
 204        case MAX8997_BUCK3:
 205                *reg = MAX8997_REG_BUCK3CTRL;
 206                *mask = 0x01;
 207                *pattern = 0x01;
 208                break;
 209        case MAX8997_BUCK4:
 210                *reg = MAX8997_REG_BUCK4CTRL;
 211                *mask = 0x01;
 212                *pattern = 0x01;
 213                break;
 214        case MAX8997_BUCK5:
 215                *reg = MAX8997_REG_BUCK5CTRL;
 216                *mask = 0x01;
 217                *pattern = 0x01;
 218                break;
 219        case MAX8997_BUCK6:
 220                *reg = MAX8997_REG_BUCK6CTRL;
 221                *mask = 0x01;
 222                *pattern = 0x01;
 223                break;
 224        case MAX8997_BUCK7:
 225                *reg = MAX8997_REG_BUCK7CTRL;
 226                *mask = 0x01;
 227                *pattern = 0x01;
 228                break;
 229        case MAX8997_EN32KHZ_AP ... MAX8997_EN32KHZ_CP:
 230                *reg = MAX8997_REG_MAINCON1;
 231                *mask = 0x01 << (rid - MAX8997_EN32KHZ_AP);
 232                *pattern = 0x01 << (rid - MAX8997_EN32KHZ_AP);
 233                break;
 234        case MAX8997_ENVICHG:
 235                *reg = MAX8997_REG_MBCCTRL1;
 236                *mask = 0x80;
 237                *pattern = 0x80;
 238                break;
 239        case MAX8997_ESAFEOUT1 ... MAX8997_ESAFEOUT2:
 240                *reg = MAX8997_REG_SAFEOUTCTRL;
 241                *mask = 0x40 << (rid - MAX8997_ESAFEOUT1);
 242                *pattern = 0x40 << (rid - MAX8997_ESAFEOUT1);
 243                break;
 244        case MAX8997_CHARGER:
 245                *reg = MAX8997_REG_MBCCTRL2;
 246                *mask = 0x40;
 247                *pattern = 0x40;
 248                break;
 249        default:
 250                /* Not controllable or not exists */
 251                return -EINVAL;
 252        }
 253
 254        return 0;
 255}
 256
 257static int max8997_reg_is_enabled(struct regulator_dev *rdev)
 258{
 259        struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 260        struct i2c_client *i2c = max8997->iodev->i2c;
 261        int ret, reg, mask, pattern;
 262        u8 val;
 263
 264        ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
 265        if (ret)
 266                return ret;
 267
 268        ret = max8997_read_reg(i2c, reg, &val);
 269        if (ret)
 270                return ret;
 271
 272        return (val & mask) == pattern;
 273}
 274
 275static int max8997_reg_enable(struct regulator_dev *rdev)
 276{
 277        struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 278        struct i2c_client *i2c = max8997->iodev->i2c;
 279        int ret, reg, mask, pattern;
 280
 281        ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
 282        if (ret)
 283                return ret;
 284
 285        return max8997_update_reg(i2c, reg, pattern, mask);
 286}
 287
 288static int max8997_reg_disable(struct regulator_dev *rdev)
 289{
 290        struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 291        struct i2c_client *i2c = max8997->iodev->i2c;
 292        int ret, reg, mask, pattern;
 293
 294        ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
 295        if (ret)
 296                return ret;
 297
 298        return max8997_update_reg(i2c, reg, ~pattern, mask);
 299}
 300
 301static int max8997_get_voltage_register(struct regulator_dev *rdev,
 302                int *_reg, int *_shift, int *_mask)
 303{
 304        struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 305        int rid = rdev_get_id(rdev);
 306        int reg, shift = 0, mask = 0x3f;
 307
 308        switch (rid) {
 309        case MAX8997_LDO1 ... MAX8997_LDO21:
 310                reg = MAX8997_REG_LDO1CTRL + (rid - MAX8997_LDO1);
 311                break;
 312        case MAX8997_BUCK1:
 313                reg = MAX8997_REG_BUCK1DVS1;
 314                if (max8997->buck1_gpiodvs)
 315                        reg += max8997->buck125_gpioindex;
 316                break;
 317        case MAX8997_BUCK2:
 318                reg = MAX8997_REG_BUCK2DVS1;
 319                if (max8997->buck2_gpiodvs)
 320                        reg += max8997->buck125_gpioindex;
 321                break;
 322        case MAX8997_BUCK3:
 323                reg = MAX8997_REG_BUCK3DVS;
 324                break;
 325        case MAX8997_BUCK4:
 326                reg = MAX8997_REG_BUCK4DVS;
 327                break;
 328        case MAX8997_BUCK5:
 329                reg = MAX8997_REG_BUCK5DVS1;
 330                if (max8997->buck5_gpiodvs)
 331                        reg += max8997->buck125_gpioindex;
 332                break;
 333        case MAX8997_BUCK7:
 334                reg = MAX8997_REG_BUCK7DVS;
 335                break;
 336        case MAX8997_ESAFEOUT1 ...  MAX8997_ESAFEOUT2:
 337                reg = MAX8997_REG_SAFEOUTCTRL;
 338                shift = (rid == MAX8997_ESAFEOUT2) ? 2 : 0;
 339                mask = 0x3;
 340                break;
 341        case MAX8997_CHARGER_CV:
 342                reg = MAX8997_REG_MBCCTRL3;
 343                shift = 0;
 344                mask = 0xf;
 345                break;
 346        case MAX8997_CHARGER:
 347                reg = MAX8997_REG_MBCCTRL4;
 348                shift = 0;
 349                mask = 0xf;
 350                break;
 351        case MAX8997_CHARGER_TOPOFF:
 352                reg = MAX8997_REG_MBCCTRL5;
 353                shift = 0;
 354                mask = 0xf;
 355                break;
 356        default:
 357                return -EINVAL;
 358        }
 359
 360        *_reg = reg;
 361        *_shift = shift;
 362        *_mask = mask;
 363
 364        return 0;
 365}
 366
 367static int max8997_get_voltage_sel(struct regulator_dev *rdev)
 368{
 369        struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 370        struct i2c_client *i2c = max8997->iodev->i2c;
 371        int reg, shift, mask, ret;
 372        u8 val;
 373
 374        ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
 375        if (ret)
 376                return ret;
 377
 378        ret = max8997_read_reg(i2c, reg, &val);
 379        if (ret)
 380                return ret;
 381
 382        val >>= shift;
 383        val &= mask;
 384
 385        return val;
 386}
 387
 388static inline int max8997_get_voltage_proper_val(
 389                const struct voltage_map_desc *desc,
 390                int min_vol, int max_vol)
 391{
 392        int i;
 393
 394        if (desc == NULL)
 395                return -EINVAL;
 396
 397        if (max_vol < desc->min || min_vol > desc->max)
 398                return -EINVAL;
 399
 400        if (min_vol < desc->min)
 401                min_vol = desc->min;
 402
 403        i = DIV_ROUND_UP(min_vol - desc->min, desc->step);
 404
 405        if (desc->min + desc->step * i > max_vol)
 406                return -EINVAL;
 407
 408        return i;
 409}
 410
 411static int max8997_set_voltage_charger_cv(struct regulator_dev *rdev,
 412                int min_uV, int max_uV, unsigned *selector)
 413{
 414        struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 415        struct i2c_client *i2c = max8997->iodev->i2c;
 416        int rid = rdev_get_id(rdev);
 417        int lb, ub;
 418        int reg, shift = 0, mask, ret = 0;
 419        u8 val = 0x0;
 420
 421        if (rid != MAX8997_CHARGER_CV)
 422                return -EINVAL;
 423
 424        ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
 425        if (ret)
 426                return ret;
 427
 428        if (max_uV < 4000000 || min_uV > 4350000)
 429                return -EINVAL;
 430
 431        if (min_uV <= 4000000)
 432                val = 0x1;
 433        else if (min_uV <= 4200000 && max_uV >= 4200000)
 434                val = 0x0;
 435        else {
 436                lb = (min_uV - 4000001) / 20000 + 2;
 437                ub = (max_uV - 4000000) / 20000 + 1;
 438
 439                if (lb > ub)
 440                        return -EINVAL;
 441
 442                if (lb < 0xf)
 443                        val = lb;
 444                else {
 445                        if (ub >= 0xf)
 446                                val = 0xf;
 447                        else
 448                                return -EINVAL;
 449                }
 450        }
 451
 452        *selector = val;
 453
 454        ret = max8997_update_reg(i2c, reg, val << shift, mask);
 455
 456        return ret;
 457}
 458
 459/*
 460 * For LDO1 ~ LDO21, BUCK1~5, BUCK7, CHARGER, CHARGER_TOPOFF
 461 * BUCK1, 2, and 5 are available if they are not controlled by gpio
 462 */
 463static int max8997_set_voltage_ldobuck(struct regulator_dev *rdev,
 464                int min_uV, int max_uV, unsigned *selector)
 465{
 466        struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 467        struct i2c_client *i2c = max8997->iodev->i2c;
 468        const struct voltage_map_desc *desc;
 469        int rid = rdev_get_id(rdev);
 470        int i, reg, shift, mask, ret;
 471
 472        switch (rid) {
 473        case MAX8997_LDO1 ... MAX8997_LDO21:
 474                break;
 475        case MAX8997_BUCK1 ... MAX8997_BUCK5:
 476                break;
 477        case MAX8997_BUCK6:
 478                return -EINVAL;
 479        case MAX8997_BUCK7:
 480                break;
 481        case MAX8997_CHARGER:
 482                break;
 483        case MAX8997_CHARGER_TOPOFF:
 484                break;
 485        default:
 486                return -EINVAL;
 487        }
 488
 489        desc = reg_voltage_map[rid];
 490
 491        i = max8997_get_voltage_proper_val(desc, min_uV, max_uV);
 492        if (i < 0)
 493                return i;
 494
 495        ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
 496        if (ret)
 497                return ret;
 498
 499        ret = max8997_update_reg(i2c, reg, i << shift, mask << shift);
 500        *selector = i;
 501
 502        return ret;
 503}
 504
 505static int max8997_set_voltage_buck_time_sel(struct regulator_dev *rdev,
 506                                                unsigned int old_selector,
 507                                                unsigned int new_selector)
 508{
 509        struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 510        int rid = rdev_get_id(rdev);
 511        const struct voltage_map_desc *desc = reg_voltage_map[rid];
 512
 513        /* Delay is required only if the voltage is increasing */
 514        if (old_selector >= new_selector)
 515                return 0;
 516
 517        /* No need to delay if gpio_dvs_mode */
 518        switch (rid) {
 519        case MAX8997_BUCK1:
 520                if (max8997->buck1_gpiodvs)
 521                        return 0;
 522                break;
 523        case MAX8997_BUCK2:
 524                if (max8997->buck2_gpiodvs)
 525                        return 0;
 526                break;
 527        case MAX8997_BUCK5:
 528                if (max8997->buck5_gpiodvs)
 529                        return 0;
 530                break;
 531        }
 532
 533        switch (rid) {
 534        case MAX8997_BUCK1:
 535        case MAX8997_BUCK2:
 536        case MAX8997_BUCK4:
 537        case MAX8997_BUCK5:
 538                return DIV_ROUND_UP(desc->step * (new_selector - old_selector),
 539                                    max8997->ramp_delay * 1000);
 540        }
 541
 542        return 0;
 543}
 544
 545/*
 546 * Assess the damage on the voltage setting of BUCK1,2,5 by the change.
 547 *
 548 * When GPIO-DVS mode is used for multiple bucks, changing the voltage value
 549 * of one of the bucks may affect that of another buck, which is the side
 550 * effect of the change (set_voltage). This function examines the GPIO-DVS
 551 * configurations and checks whether such side-effect exists.
 552 */
 553static int max8997_assess_side_effect(struct regulator_dev *rdev,
 554                u8 new_val, int *best)
 555{
 556        struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 557        int rid = rdev_get_id(rdev);
 558        u8 *buckx_val[3];
 559        bool buckx_gpiodvs[3];
 560        int side_effect[8];
 561        int min_side_effect = INT_MAX;
 562        int i;
 563
 564        *best = -1;
 565
 566        switch (rid) {
 567        case MAX8997_BUCK1:
 568                rid = 0;
 569                break;
 570        case MAX8997_BUCK2:
 571                rid = 1;
 572                break;
 573        case MAX8997_BUCK5:
 574                rid = 2;
 575                break;
 576        default:
 577                return -EINVAL;
 578        }
 579
 580        buckx_val[0] = max8997->buck1_vol;
 581        buckx_val[1] = max8997->buck2_vol;
 582        buckx_val[2] = max8997->buck5_vol;
 583        buckx_gpiodvs[0] = max8997->buck1_gpiodvs;
 584        buckx_gpiodvs[1] = max8997->buck2_gpiodvs;
 585        buckx_gpiodvs[2] = max8997->buck5_gpiodvs;
 586
 587        for (i = 0; i < 8; i++) {
 588                int others;
 589
 590                if (new_val != (buckx_val[rid])[i]) {
 591                        side_effect[i] = -1;
 592                        continue;
 593                }
 594
 595                side_effect[i] = 0;
 596                for (others = 0; others < 3; others++) {
 597                        int diff;
 598
 599                        if (others == rid)
 600                                continue;
 601                        if (buckx_gpiodvs[others] == false)
 602                                continue; /* Not affected */
 603                        diff = (buckx_val[others])[i] -
 604                                (buckx_val[others])[max8997->buck125_gpioindex];
 605                        if (diff > 0)
 606                                side_effect[i] += diff;
 607                        else if (diff < 0)
 608                                side_effect[i] -= diff;
 609                }
 610                if (side_effect[i] == 0) {
 611                        *best = i;
 612                        return 0; /* NO SIDE EFFECT! Use This! */
 613                }
 614                if (side_effect[i] < min_side_effect) {
 615                        min_side_effect = side_effect[i];
 616                        *best = i;
 617                }
 618        }
 619
 620        if (*best == -1)
 621                return -EINVAL;
 622
 623        return side_effect[*best];
 624}
 625
 626/*
 627 * For Buck 1 ~ 5 and 7. If it is not controlled by GPIO, this calls
 628 * max8997_set_voltage_ldobuck to do the job.
 629 */
 630static int max8997_set_voltage_buck(struct regulator_dev *rdev,
 631                int min_uV, int max_uV, unsigned *selector)
 632{
 633        struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 634        int rid = rdev_get_id(rdev);
 635        const struct voltage_map_desc *desc;
 636        int new_val, new_idx, damage, tmp_val, tmp_idx, tmp_dmg;
 637        bool gpio_dvs_mode = false;
 638
 639        if (rid < MAX8997_BUCK1 || rid > MAX8997_BUCK7)
 640                return -EINVAL;
 641
 642        switch (rid) {
 643        case MAX8997_BUCK1:
 644                if (max8997->buck1_gpiodvs)
 645                        gpio_dvs_mode = true;
 646                break;
 647        case MAX8997_BUCK2:
 648                if (max8997->buck2_gpiodvs)
 649                        gpio_dvs_mode = true;
 650                break;
 651        case MAX8997_BUCK5:
 652                if (max8997->buck5_gpiodvs)
 653                        gpio_dvs_mode = true;
 654                break;
 655        }
 656
 657        if (!gpio_dvs_mode)
 658                return max8997_set_voltage_ldobuck(rdev, min_uV, max_uV,
 659                                                selector);
 660
 661        desc = reg_voltage_map[rid];
 662        new_val = max8997_get_voltage_proper_val(desc, min_uV, max_uV);
 663        if (new_val < 0)
 664                return new_val;
 665
 666        tmp_dmg = INT_MAX;
 667        tmp_idx = -1;
 668        tmp_val = -1;
 669        do {
 670                damage = max8997_assess_side_effect(rdev, new_val, &new_idx);
 671                if (damage == 0)
 672                        goto out;
 673
 674                if (tmp_dmg > damage) {
 675                        tmp_idx = new_idx;
 676                        tmp_val = new_val;
 677                        tmp_dmg = damage;
 678                }
 679
 680                new_val++;
 681        } while (desc->min + desc->step * new_val <= desc->max);
 682
 683        new_idx = tmp_idx;
 684        new_val = tmp_val;
 685
 686        if (max8997->ignore_gpiodvs_side_effect == false)
 687                return -EINVAL;
 688
 689        dev_warn(&rdev->dev,
 690                "MAX8997 GPIO-DVS Side Effect Warning: GPIO SET:  %d -> %d\n",
 691                max8997->buck125_gpioindex, tmp_idx);
 692
 693out:
 694        if (new_idx < 0 || new_val < 0)
 695                return -EINVAL;
 696
 697        max8997->buck125_gpioindex = new_idx;
 698        max8997_set_gpio(max8997);
 699        *selector = new_val;
 700
 701        return 0;
 702}
 703
 704/* For SAFEOUT1 and SAFEOUT2 */
 705static int max8997_set_voltage_safeout_sel(struct regulator_dev *rdev,
 706                                           unsigned selector)
 707{
 708        struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 709        struct i2c_client *i2c = max8997->iodev->i2c;
 710        int rid = rdev_get_id(rdev);
 711        int reg, shift = 0, mask, ret;
 712
 713        if (rid != MAX8997_ESAFEOUT1 && rid != MAX8997_ESAFEOUT2)
 714                return -EINVAL;
 715
 716        ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
 717        if (ret)
 718                return ret;
 719
 720        return max8997_update_reg(i2c, reg, selector << shift, mask << shift);
 721}
 722
 723static int max8997_reg_disable_suspend(struct regulator_dev *rdev)
 724{
 725        struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 726        struct i2c_client *i2c = max8997->iodev->i2c;
 727        int ret, reg, mask, pattern;
 728        int rid = rdev_get_id(rdev);
 729
 730        ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
 731        if (ret)
 732                return ret;
 733
 734        max8997_read_reg(i2c, reg, &max8997->saved_states[rid]);
 735
 736        if (rid == MAX8997_LDO1 ||
 737                        rid == MAX8997_LDO10 ||
 738                        rid == MAX8997_LDO21) {
 739                dev_dbg(&rdev->dev, "Conditional Power-Off for %s\n",
 740                                rdev->desc->name);
 741                return max8997_update_reg(i2c, reg, 0x40, mask);
 742        }
 743
 744        dev_dbg(&rdev->dev, "Full Power-Off for %s (%xh -> %xh)\n",
 745                        rdev->desc->name, max8997->saved_states[rid] & mask,
 746                        (~pattern) & mask);
 747        return max8997_update_reg(i2c, reg, ~pattern, mask);
 748}
 749
 750static struct regulator_ops max8997_ldo_ops = {
 751        .list_voltage           = max8997_list_voltage,
 752        .is_enabled             = max8997_reg_is_enabled,
 753        .enable                 = max8997_reg_enable,
 754        .disable                = max8997_reg_disable,
 755        .get_voltage_sel        = max8997_get_voltage_sel,
 756        .set_voltage            = max8997_set_voltage_ldobuck,
 757        .set_suspend_disable    = max8997_reg_disable_suspend,
 758};
 759
 760static struct regulator_ops max8997_buck_ops = {
 761        .list_voltage           = max8997_list_voltage,
 762        .is_enabled             = max8997_reg_is_enabled,
 763        .enable                 = max8997_reg_enable,
 764        .disable                = max8997_reg_disable,
 765        .get_voltage_sel        = max8997_get_voltage_sel,
 766        .set_voltage            = max8997_set_voltage_buck,
 767        .set_voltage_time_sel   = max8997_set_voltage_buck_time_sel,
 768        .set_suspend_disable    = max8997_reg_disable_suspend,
 769};
 770
 771static struct regulator_ops max8997_fixedvolt_ops = {
 772        .list_voltage           = max8997_list_voltage,
 773        .is_enabled             = max8997_reg_is_enabled,
 774        .enable                 = max8997_reg_enable,
 775        .disable                = max8997_reg_disable,
 776        .set_suspend_disable    = max8997_reg_disable_suspend,
 777};
 778
 779static struct regulator_ops max8997_safeout_ops = {
 780        .list_voltage           = regulator_list_voltage_table,
 781        .is_enabled             = max8997_reg_is_enabled,
 782        .enable                 = max8997_reg_enable,
 783        .disable                = max8997_reg_disable,
 784        .get_voltage_sel        = max8997_get_voltage_sel,
 785        .set_voltage_sel        = max8997_set_voltage_safeout_sel,
 786        .set_suspend_disable    = max8997_reg_disable_suspend,
 787};
 788
 789static struct regulator_ops max8997_fixedstate_ops = {
 790        .list_voltage           = max8997_list_voltage_charger_cv,
 791        .get_voltage_sel        = max8997_get_voltage_sel,
 792        .set_voltage            = max8997_set_voltage_charger_cv,
 793};
 794
 795static int max8997_set_current_limit(struct regulator_dev *rdev,
 796                                     int min_uA, int max_uA)
 797{
 798        unsigned dummy;
 799        int rid = rdev_get_id(rdev);
 800
 801        if (rid != MAX8997_CHARGER && rid != MAX8997_CHARGER_TOPOFF)
 802                return -EINVAL;
 803
 804        /* Reuse max8997_set_voltage_ldobuck to set current_limit. */
 805        return max8997_set_voltage_ldobuck(rdev, min_uA, max_uA, &dummy);
 806}
 807
 808static int max8997_get_current_limit(struct regulator_dev *rdev)
 809{
 810        int sel, rid = rdev_get_id(rdev);
 811
 812        if (rid != MAX8997_CHARGER && rid != MAX8997_CHARGER_TOPOFF)
 813                return -EINVAL;
 814
 815        sel = max8997_get_voltage_sel(rdev);
 816        if (sel < 0)
 817                return sel;
 818
 819        /* Reuse max8997_list_voltage to get current_limit. */
 820        return max8997_list_voltage(rdev, sel);
 821}
 822
 823static struct regulator_ops max8997_charger_ops = {
 824        .is_enabled             = max8997_reg_is_enabled,
 825        .enable                 = max8997_reg_enable,
 826        .disable                = max8997_reg_disable,
 827        .get_current_limit      = max8997_get_current_limit,
 828        .set_current_limit      = max8997_set_current_limit,
 829};
 830
 831static struct regulator_ops max8997_charger_fixedstate_ops = {
 832        .get_current_limit      = max8997_get_current_limit,
 833        .set_current_limit      = max8997_set_current_limit,
 834};
 835
 836#define MAX8997_VOLTAGE_REGULATOR(_name, _ops) {\
 837        .name           = #_name,               \
 838        .id             = MAX8997_##_name,      \
 839        .ops            = &_ops,                \
 840        .type           = REGULATOR_VOLTAGE,    \
 841        .owner          = THIS_MODULE,          \
 842}
 843
 844#define MAX8997_CURRENT_REGULATOR(_name, _ops) {\
 845        .name           = #_name,               \
 846        .id             = MAX8997_##_name,      \
 847        .ops            = &_ops,                \
 848        .type           = REGULATOR_CURRENT,    \
 849        .owner          = THIS_MODULE,          \
 850}
 851
 852static struct regulator_desc regulators[] = {
 853        MAX8997_VOLTAGE_REGULATOR(LDO1, max8997_ldo_ops),
 854        MAX8997_VOLTAGE_REGULATOR(LDO2, max8997_ldo_ops),
 855        MAX8997_VOLTAGE_REGULATOR(LDO3, max8997_ldo_ops),
 856        MAX8997_VOLTAGE_REGULATOR(LDO4, max8997_ldo_ops),
 857        MAX8997_VOLTAGE_REGULATOR(LDO5, max8997_ldo_ops),
 858        MAX8997_VOLTAGE_REGULATOR(LDO6, max8997_ldo_ops),
 859        MAX8997_VOLTAGE_REGULATOR(LDO7, max8997_ldo_ops),
 860        MAX8997_VOLTAGE_REGULATOR(LDO8, max8997_ldo_ops),
 861        MAX8997_VOLTAGE_REGULATOR(LDO9, max8997_ldo_ops),
 862        MAX8997_VOLTAGE_REGULATOR(LDO10, max8997_ldo_ops),
 863        MAX8997_VOLTAGE_REGULATOR(LDO11, max8997_ldo_ops),
 864        MAX8997_VOLTAGE_REGULATOR(LDO12, max8997_ldo_ops),
 865        MAX8997_VOLTAGE_REGULATOR(LDO13, max8997_ldo_ops),
 866        MAX8997_VOLTAGE_REGULATOR(LDO14, max8997_ldo_ops),
 867        MAX8997_VOLTAGE_REGULATOR(LDO15, max8997_ldo_ops),
 868        MAX8997_VOLTAGE_REGULATOR(LDO16, max8997_ldo_ops),
 869        MAX8997_VOLTAGE_REGULATOR(LDO17, max8997_ldo_ops),
 870        MAX8997_VOLTAGE_REGULATOR(LDO18, max8997_ldo_ops),
 871        MAX8997_VOLTAGE_REGULATOR(LDO21, max8997_ldo_ops),
 872        MAX8997_VOLTAGE_REGULATOR(BUCK1, max8997_buck_ops),
 873        MAX8997_VOLTAGE_REGULATOR(BUCK2, max8997_buck_ops),
 874        MAX8997_VOLTAGE_REGULATOR(BUCK3, max8997_buck_ops),
 875        MAX8997_VOLTAGE_REGULATOR(BUCK4, max8997_buck_ops),
 876        MAX8997_VOLTAGE_REGULATOR(BUCK5, max8997_buck_ops),
 877        MAX8997_VOLTAGE_REGULATOR(BUCK6, max8997_fixedvolt_ops),
 878        MAX8997_VOLTAGE_REGULATOR(BUCK7, max8997_buck_ops),
 879        MAX8997_VOLTAGE_REGULATOR(EN32KHZ_AP, max8997_fixedvolt_ops),
 880        MAX8997_VOLTAGE_REGULATOR(EN32KHZ_CP, max8997_fixedvolt_ops),
 881        MAX8997_VOLTAGE_REGULATOR(ENVICHG, max8997_fixedvolt_ops),
 882        MAX8997_VOLTAGE_REGULATOR(ESAFEOUT1, max8997_safeout_ops),
 883        MAX8997_VOLTAGE_REGULATOR(ESAFEOUT2, max8997_safeout_ops),
 884        MAX8997_VOLTAGE_REGULATOR(CHARGER_CV, max8997_fixedstate_ops),
 885        MAX8997_CURRENT_REGULATOR(CHARGER, max8997_charger_ops),
 886        MAX8997_CURRENT_REGULATOR(CHARGER_TOPOFF,
 887                                  max8997_charger_fixedstate_ops),
 888};
 889
 890#ifdef CONFIG_OF
 891static int max8997_pmic_dt_parse_dvs_gpio(struct platform_device *pdev,
 892                        struct max8997_platform_data *pdata,
 893                        struct device_node *pmic_np)
 894{
 895        int i, gpio;
 896
 897        for (i = 0; i < 3; i++) {
 898                gpio = of_get_named_gpio(pmic_np,
 899                                        "max8997,pmic-buck125-dvs-gpios", i);
 900                if (!gpio_is_valid(gpio)) {
 901                        dev_err(&pdev->dev, "invalid gpio[%d]: %d\n", i, gpio);
 902                        return -EINVAL;
 903                }
 904                pdata->buck125_gpios[i] = gpio;
 905        }
 906        return 0;
 907}
 908
 909static int max8997_pmic_dt_parse_pdata(struct platform_device *pdev,
 910                                        struct max8997_platform_data *pdata)
 911{
 912        struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 913        struct device_node *pmic_np, *regulators_np, *reg_np;
 914        struct max8997_regulator_data *rdata;
 915        unsigned int i, dvs_voltage_nr = 1, ret;
 916
 917        pmic_np = iodev->dev->of_node;
 918        if (!pmic_np) {
 919                dev_err(&pdev->dev, "could not find pmic sub-node\n");
 920                return -ENODEV;
 921        }
 922
 923        regulators_np = of_get_child_by_name(pmic_np, "regulators");
 924        if (!regulators_np) {
 925                dev_err(&pdev->dev, "could not find regulators sub-node\n");
 926                return -EINVAL;
 927        }
 928
 929        /* count the number of regulators to be supported in pmic */
 930        pdata->num_regulators = of_get_child_count(regulators_np);
 931
 932        rdata = devm_kcalloc(&pdev->dev,
 933                             pdata->num_regulators, sizeof(*rdata),
 934                             GFP_KERNEL);
 935        if (!rdata) {
 936                of_node_put(regulators_np);
 937                return -ENOMEM;
 938        }
 939
 940        pdata->regulators = rdata;
 941        for_each_child_of_node(regulators_np, reg_np) {
 942                for (i = 0; i < ARRAY_SIZE(regulators); i++)
 943                        if (!of_node_cmp(reg_np->name, regulators[i].name))
 944                                break;
 945
 946                if (i == ARRAY_SIZE(regulators)) {
 947                        dev_warn(&pdev->dev, "don't know how to configure regulator %s\n",
 948                                 reg_np->name);
 949                        continue;
 950                }
 951
 952                rdata->id = i;
 953                rdata->initdata = of_get_regulator_init_data(&pdev->dev,
 954                                                             reg_np,
 955                                                             &regulators[i]);
 956                rdata->reg_node = reg_np;
 957                rdata++;
 958        }
 959        of_node_put(regulators_np);
 960
 961        if (of_get_property(pmic_np, "max8997,pmic-buck1-uses-gpio-dvs", NULL))
 962                pdata->buck1_gpiodvs = true;
 963
 964        if (of_get_property(pmic_np, "max8997,pmic-buck2-uses-gpio-dvs", NULL))
 965                pdata->buck2_gpiodvs = true;
 966
 967        if (of_get_property(pmic_np, "max8997,pmic-buck5-uses-gpio-dvs", NULL))
 968                pdata->buck5_gpiodvs = true;
 969
 970        if (pdata->buck1_gpiodvs || pdata->buck2_gpiodvs ||
 971                                                pdata->buck5_gpiodvs) {
 972                ret = max8997_pmic_dt_parse_dvs_gpio(pdev, pdata, pmic_np);
 973                if (ret)
 974                        return -EINVAL;
 975
 976                if (of_property_read_u32(pmic_np,
 977                                "max8997,pmic-buck125-default-dvs-idx",
 978                                &pdata->buck125_default_idx)) {
 979                        pdata->buck125_default_idx = 0;
 980                } else {
 981                        if (pdata->buck125_default_idx >= 8) {
 982                                pdata->buck125_default_idx = 0;
 983                                dev_info(&pdev->dev, "invalid value for default dvs index, using 0 instead\n");
 984                        }
 985                }
 986
 987                if (of_get_property(pmic_np,
 988                        "max8997,pmic-ignore-gpiodvs-side-effect", NULL))
 989                        pdata->ignore_gpiodvs_side_effect = true;
 990
 991                dvs_voltage_nr = 8;
 992        }
 993
 994        if (of_property_read_u32_array(pmic_np,
 995                                "max8997,pmic-buck1-dvs-voltage",
 996                                pdata->buck1_voltage, dvs_voltage_nr)) {
 997                dev_err(&pdev->dev, "buck1 voltages not specified\n");
 998                return -EINVAL;
 999        }
1000
1001        if (of_property_read_u32_array(pmic_np,
1002                                "max8997,pmic-buck2-dvs-voltage",
1003                                pdata->buck2_voltage, dvs_voltage_nr)) {
1004                dev_err(&pdev->dev, "buck2 voltages not specified\n");
1005                return -EINVAL;
1006        }
1007
1008        if (of_property_read_u32_array(pmic_np,
1009                                "max8997,pmic-buck5-dvs-voltage",
1010                                pdata->buck5_voltage, dvs_voltage_nr)) {
1011                dev_err(&pdev->dev, "buck5 voltages not specified\n");
1012                return -EINVAL;
1013        }
1014
1015        return 0;
1016}
1017#else
1018static int max8997_pmic_dt_parse_pdata(struct platform_device *pdev,
1019                                        struct max8997_platform_data *pdata)
1020{
1021        return 0;
1022}
1023#endif /* CONFIG_OF */
1024
1025static int max8997_pmic_probe(struct platform_device *pdev)
1026{
1027        struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
1028        struct max8997_platform_data *pdata = iodev->pdata;
1029        struct regulator_config config = { };
1030        struct regulator_dev *rdev;
1031        struct max8997_data *max8997;
1032        struct i2c_client *i2c;
1033        int i, ret, nr_dvs;
1034        u8 max_buck1 = 0, max_buck2 = 0, max_buck5 = 0;
1035
1036        if (!pdata) {
1037                dev_err(&pdev->dev, "No platform init data supplied.\n");
1038                return -ENODEV;
1039        }
1040
1041        if (iodev->dev->of_node) {
1042                ret = max8997_pmic_dt_parse_pdata(pdev, pdata);
1043                if (ret)
1044                        return ret;
1045        }
1046
1047        max8997 = devm_kzalloc(&pdev->dev, sizeof(struct max8997_data),
1048                               GFP_KERNEL);
1049        if (!max8997)
1050                return -ENOMEM;
1051
1052        max8997->dev = &pdev->dev;
1053        max8997->iodev = iodev;
1054        max8997->num_regulators = pdata->num_regulators;
1055        platform_set_drvdata(pdev, max8997);
1056        i2c = max8997->iodev->i2c;
1057
1058        max8997->buck125_gpioindex = pdata->buck125_default_idx;
1059        max8997->buck1_gpiodvs = pdata->buck1_gpiodvs;
1060        max8997->buck2_gpiodvs = pdata->buck2_gpiodvs;
1061        max8997->buck5_gpiodvs = pdata->buck5_gpiodvs;
1062        memcpy(max8997->buck125_gpios, pdata->buck125_gpios, sizeof(int) * 3);
1063        max8997->ignore_gpiodvs_side_effect = pdata->ignore_gpiodvs_side_effect;
1064
1065        nr_dvs = (pdata->buck1_gpiodvs || pdata->buck2_gpiodvs ||
1066                        pdata->buck5_gpiodvs) ? 8 : 1;
1067
1068        for (i = 0; i < nr_dvs; i++) {
1069                max8997->buck1_vol[i] = ret =
1070                        max8997_get_voltage_proper_val(
1071                                        &buck1245_voltage_map_desc,
1072                                        pdata->buck1_voltage[i],
1073                                        pdata->buck1_voltage[i] +
1074                                        buck1245_voltage_map_desc.step);
1075                if (ret < 0)
1076                        return ret;
1077
1078                max8997->buck2_vol[i] = ret =
1079                        max8997_get_voltage_proper_val(
1080                                        &buck1245_voltage_map_desc,
1081                                        pdata->buck2_voltage[i],
1082                                        pdata->buck2_voltage[i] +
1083                                        buck1245_voltage_map_desc.step);
1084                if (ret < 0)
1085                        return ret;
1086
1087                max8997->buck5_vol[i] = ret =
1088                        max8997_get_voltage_proper_val(
1089                                        &buck1245_voltage_map_desc,
1090                                        pdata->buck5_voltage[i],
1091                                        pdata->buck5_voltage[i] +
1092                                        buck1245_voltage_map_desc.step);
1093                if (ret < 0)
1094                        return ret;
1095
1096                if (max_buck1 < max8997->buck1_vol[i])
1097                        max_buck1 = max8997->buck1_vol[i];
1098                if (max_buck2 < max8997->buck2_vol[i])
1099                        max_buck2 = max8997->buck2_vol[i];
1100                if (max_buck5 < max8997->buck5_vol[i])
1101                        max_buck5 = max8997->buck5_vol[i];
1102        }
1103
1104        /* For the safety, set max voltage before setting up */
1105        for (i = 0; i < 8; i++) {
1106                max8997_update_reg(i2c, MAX8997_REG_BUCK1DVS1 + i,
1107                                max_buck1, 0x3f);
1108                max8997_update_reg(i2c, MAX8997_REG_BUCK2DVS1 + i,
1109                                max_buck2, 0x3f);
1110                max8997_update_reg(i2c, MAX8997_REG_BUCK5DVS1 + i,
1111                                max_buck5, 0x3f);
1112        }
1113
1114        /* Initialize all the DVS related BUCK registers */
1115        for (i = 0; i < nr_dvs; i++) {
1116                max8997_update_reg(i2c, MAX8997_REG_BUCK1DVS1 + i,
1117                                max8997->buck1_vol[i],
1118                                0x3f);
1119                max8997_update_reg(i2c, MAX8997_REG_BUCK2DVS1 + i,
1120                                max8997->buck2_vol[i],
1121                                0x3f);
1122                max8997_update_reg(i2c, MAX8997_REG_BUCK5DVS1 + i,
1123                                max8997->buck5_vol[i],
1124                                0x3f);
1125        }
1126
1127        /*
1128         * If buck 1, 2, and 5 do not care DVS GPIO settings, ignore them.
1129         * If at least one of them cares, set gpios.
1130         */
1131        if (pdata->buck1_gpiodvs || pdata->buck2_gpiodvs ||
1132                        pdata->buck5_gpiodvs) {
1133
1134                if (!gpio_is_valid(pdata->buck125_gpios[0]) ||
1135                                !gpio_is_valid(pdata->buck125_gpios[1]) ||
1136                                !gpio_is_valid(pdata->buck125_gpios[2])) {
1137                        dev_err(&pdev->dev, "GPIO NOT VALID\n");
1138                        return -EINVAL;
1139                }
1140
1141                ret = devm_gpio_request(&pdev->dev, pdata->buck125_gpios[0],
1142                                        "MAX8997 SET1");
1143                if (ret)
1144                        return ret;
1145
1146                ret = devm_gpio_request(&pdev->dev, pdata->buck125_gpios[1],
1147                                        "MAX8997 SET2");
1148                if (ret)
1149                        return ret;
1150
1151                ret = devm_gpio_request(&pdev->dev, pdata->buck125_gpios[2],
1152                                "MAX8997 SET3");
1153                if (ret)
1154                        return ret;
1155
1156                gpio_direction_output(pdata->buck125_gpios[0],
1157                                (max8997->buck125_gpioindex >> 2)
1158                                & 0x1); /* SET1 */
1159                gpio_direction_output(pdata->buck125_gpios[1],
1160                                (max8997->buck125_gpioindex >> 1)
1161                                & 0x1); /* SET2 */
1162                gpio_direction_output(pdata->buck125_gpios[2],
1163                                (max8997->buck125_gpioindex >> 0)
1164                                & 0x1); /* SET3 */
1165        }
1166
1167        /* DVS-GPIO disabled */
1168        max8997_update_reg(i2c, MAX8997_REG_BUCK1CTRL, (pdata->buck1_gpiodvs) ?
1169                        (1 << 1) : (0 << 1), 1 << 1);
1170        max8997_update_reg(i2c, MAX8997_REG_BUCK2CTRL, (pdata->buck2_gpiodvs) ?
1171                        (1 << 1) : (0 << 1), 1 << 1);
1172        max8997_update_reg(i2c, MAX8997_REG_BUCK5CTRL, (pdata->buck5_gpiodvs) ?
1173                        (1 << 1) : (0 << 1), 1 << 1);
1174
1175        /* Misc Settings */
1176        max8997->ramp_delay = 10; /* set 10mV/us, which is the default */
1177        max8997_write_reg(i2c, MAX8997_REG_BUCKRAMP, (0xf << 4) | 0x9);
1178
1179        for (i = 0; i < pdata->num_regulators; i++) {
1180                const struct voltage_map_desc *desc;
1181                int id = pdata->regulators[i].id;
1182
1183                desc = reg_voltage_map[id];
1184                if (desc) {
1185                        regulators[id].n_voltages =
1186                                (desc->max - desc->min) / desc->step + 1;
1187                } else if (id == MAX8997_ESAFEOUT1 || id == MAX8997_ESAFEOUT2) {
1188                        regulators[id].volt_table = safeoutvolt;
1189                        regulators[id].n_voltages = ARRAY_SIZE(safeoutvolt);
1190                } else if (id == MAX8997_CHARGER_CV) {
1191                        regulators[id].n_voltages = 16;
1192                }
1193
1194                config.dev = max8997->dev;
1195                config.init_data = pdata->regulators[i].initdata;
1196                config.driver_data = max8997;
1197                config.of_node = pdata->regulators[i].reg_node;
1198
1199                rdev = devm_regulator_register(&pdev->dev, &regulators[id],
1200                                               &config);
1201                if (IS_ERR(rdev)) {
1202                        dev_err(max8997->dev, "regulator init failed for %d\n",
1203                                        id);
1204                        return PTR_ERR(rdev);
1205                }
1206        }
1207
1208        return 0;
1209}
1210
1211static const struct platform_device_id max8997_pmic_id[] = {
1212        { "max8997-pmic", 0},
1213        { },
1214};
1215MODULE_DEVICE_TABLE(platform, max8997_pmic_id);
1216
1217static struct platform_driver max8997_pmic_driver = {
1218        .driver = {
1219                .name = "max8997-pmic",
1220        },
1221        .probe = max8997_pmic_probe,
1222        .id_table = max8997_pmic_id,
1223};
1224
1225static int __init max8997_pmic_init(void)
1226{
1227        return platform_driver_register(&max8997_pmic_driver);
1228}
1229subsys_initcall(max8997_pmic_init);
1230
1231static void __exit max8997_pmic_cleanup(void)
1232{
1233        platform_driver_unregister(&max8997_pmic_driver);
1234}
1235module_exit(max8997_pmic_cleanup);
1236
1237MODULE_DESCRIPTION("MAXIM 8997/8966 Regulator Driver");
1238MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
1239MODULE_LICENSE("GPL");
1240