drivers/regulator/max8997.c

   1 /*
   2  * max8997.c - Regulator driver for the Maxim 8997/8966
   3  *
   4  * Copyright (C) 2011 Samsung Electronics
   5  * MyungJoo Ham <myungjoo.ham@smasung.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
  37 struct 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
  56 static const unsigned int safeoutvolt[] = {
  57         4850000,
  58         4900000,
  59         4950000,
  60         3300000,
  61 };
  62
  63 static 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
  74 struct voltage_map_desc {
  75         int min;
  76         int max;
  77         int step;
  78 };
  79
  80 /* Voltage maps in uV */
  81 static const struct voltage_map_desc ldo_voltage_map_desc = {
  82         .min = 800000,  .max = 3950000, .step = 50000,
  83 }; /* LDO1 ~ 18, 21 all */
  84
  85 static const struct voltage_map_desc buck1245_voltage_map_desc = {
  86         .min = 650000,  .max = 2225000, .step = 25000,
  87 }; /* Buck1, 2, 4, 5 */
  88
  89 static 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 */
  94 static const struct voltage_map_desc charger_current_map_desc = {
  95         .min = 200000,  .max = 950000,  .step = 50000,
  96 };
  97
  98 static const struct voltage_map_desc topoff_current_map_desc = {
  99         .min = 50000,   .max = 200000,  .step = 10000,
 100 };
 101
 102 static 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
 139 static 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         }
 157 err:
 158         return -EINVAL;
 159 }
 160
 161 static 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
 183 static 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
 257 static 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
 275 static 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
 288 static 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
 301 static 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
 367 static 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
 388 static 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
 411 static 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                 if (max_uV >= 4000000)
 433                         return -EINVAL;
 434                 else
 435                         val = 0x1;
 436         } else if (min_uV <= 4200000 && max_uV >= 4200000)
 437                 val = 0x0;
 438         else {
 439                 lb = (min_uV - 4000001) / 20000 + 2;
 440                 ub = (max_uV - 4000000) / 20000 + 1;
 441
 442                 if (lb > ub)
 443                         return -EINVAL;
 444
 445                 if (lb < 0xf)
 446                         val = lb;
 447                 else {
 448                         if (ub >= 0xf)
 449                                 val = 0xf;
 450                         else
 451                                 return -EINVAL;
 452                 }
 453         }
 454
 455         *selector = val;
 456
 457         ret = max8997_update_reg(i2c, reg, val << shift, mask);
 458
 459         return ret;
 460 }
 461
 462 /*
 463  * For LDO1 ~ LDO21, BUCK1~5, BUCK7, CHARGER, CHARGER_TOPOFF
 464  * BUCK1, 2, and 5 are available if they are not controlled by gpio
 465  */
 466 static int max8997_set_voltage_ldobuck(struct regulator_dev *rdev,
 467                 int min_uV, int max_uV, unsigned *selector)
 468 {
 469         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 470         struct i2c_client *i2c = max8997->iodev->i2c;
 471         const struct voltage_map_desc *desc;
 472         int rid = rdev_get_id(rdev);
 473         int i, reg, shift, mask, ret;
 474
 475         switch (rid) {
 476         case MAX8997_LDO1 ... MAX8997_LDO21:
 477                 break;
 478         case MAX8997_BUCK1 ... MAX8997_BUCK5:
 479                 break;
 480         case MAX8997_BUCK6:
 481                 return -EINVAL;
 482         case MAX8997_BUCK7:
 483                 break;
 484         case MAX8997_CHARGER:
 485                 break;
 486         case MAX8997_CHARGER_TOPOFF:
 487                 break;
 488         default:
 489                 return -EINVAL;
 490         }
 491
 492         desc = reg_voltage_map[rid];
 493
 494         i = max8997_get_voltage_proper_val(desc, min_uV, max_uV);
 495         if (i < 0)
 496                 return i;
 497
 498         ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
 499         if (ret)
 500                 return ret;
 501
 502         ret = max8997_update_reg(i2c, reg, i << shift, mask << shift);
 503         *selector = i;
 504
 505         return ret;
 506 }
 507
 508 static int max8997_set_voltage_buck_time_sel(struct regulator_dev *rdev,
 509                                                 unsigned int old_selector,
 510                                                 unsigned int new_selector)
 511 {
 512         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 513         int rid = rdev_get_id(rdev);
 514         const struct voltage_map_desc *desc = reg_voltage_map[rid];
 515
 516         /* Delay is required only if the voltage is increasing */
 517         if (old_selector >= new_selector)
 518                 return 0;
 519
 520         /* No need to delay if gpio_dvs_mode */
 521         switch (rid) {
 522         case MAX8997_BUCK1:
 523                 if (max8997->buck1_gpiodvs)
 524                         return 0;
 525                 break;
 526         case MAX8997_BUCK2:
 527                 if (max8997->buck2_gpiodvs)
 528                         return 0;
 529                 break;
 530         case MAX8997_BUCK5:
 531                 if (max8997->buck5_gpiodvs)
 532                         return 0;
 533                 break;
 534         }
 535
 536         switch (rid) {
 537         case MAX8997_BUCK1:
 538         case MAX8997_BUCK2:
 539         case MAX8997_BUCK4:
 540         case MAX8997_BUCK5:
 541                 return DIV_ROUND_UP(desc->step * (new_selector - old_selector),
 542                                     max8997->ramp_delay * 1000);
 543         }
 544
 545         return 0;
 546 }
 547
 548 /*
 549  * Assess the damage on the voltage setting of BUCK1,2,5 by the change.
 550  *
 551  * When GPIO-DVS mode is used for multiple bucks, changing the voltage value
 552  * of one of the bucks may affect that of another buck, which is the side
 553  * effect of the change (set_voltage). This function examines the GPIO-DVS
 554  * configurations and checks whether such side-effect exists.
 555  */
 556 static int max8997_assess_side_effect(struct regulator_dev *rdev,
 557                 u8 new_val, int *best)
 558 {
 559         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 560         int rid = rdev_get_id(rdev);
 561         u8 *buckx_val[3];
 562         bool buckx_gpiodvs[3];
 563         int side_effect[8];
 564         int min_side_effect = INT_MAX;
 565         int i;
 566
 567         *best = -1;
 568
 569         switch (rid) {
 570         case MAX8997_BUCK1:
 571                 rid = 0;
 572                 break;
 573         case MAX8997_BUCK2:
 574                 rid = 1;
 575                 break;
 576         case MAX8997_BUCK5:
 577                 rid = 2;
 578                 break;
 579         default:
 580                 return -EINVAL;
 581         }
 582
 583         buckx_val[0] = max8997->buck1_vol;
 584         buckx_val[1] = max8997->buck2_vol;
 585         buckx_val[2] = max8997->buck5_vol;
 586         buckx_gpiodvs[0] = max8997->buck1_gpiodvs;
 587         buckx_gpiodvs[1] = max8997->buck2_gpiodvs;
 588         buckx_gpiodvs[2] = max8997->buck5_gpiodvs;
 589
 590         for (i = 0; i < 8; i++) {
 591                 int others;
 592
 593                 if (new_val != (buckx_val[rid])[i]) {
 594                         side_effect[i] = -1;
 595                         continue;
 596                 }
 597
 598                 side_effect[i] = 0;
 599                 for (others = 0; others < 3; others++) {
 600                         int diff;
 601
 602                         if (others == rid)
 603                                 continue;
 604                         if (buckx_gpiodvs[others] == false)
 605                                 continue; /* Not affected */
 606                         diff = (buckx_val[others])[i] -
 607                                 (buckx_val[others])[max8997->buck125_gpioindex];
 608                         if (diff > 0)
 609                                 side_effect[i] += diff;
 610                         else if (diff < 0)
 611                                 side_effect[i] -= diff;
 612                 }
 613                 if (side_effect[i] == 0) {
 614                         *best = i;
 615                         return 0; /* NO SIDE EFFECT! Use This! */
 616                 }
 617                 if (side_effect[i] < min_side_effect) {
 618                         min_side_effect = side_effect[i];
 619                         *best = i;
 620                 }
 621         }
 622
 623         if (*best == -1)
 624                 return -EINVAL;
 625
 626         return side_effect[*best];
 627 }
 628
 629 /*
 630  * For Buck 1 ~ 5 and 7. If it is not controlled by GPIO, this calls
 631  * max8997_set_voltage_ldobuck to do the job.
 632  */
 633 static int max8997_set_voltage_buck(struct regulator_dev *rdev,
 634                 int min_uV, int max_uV, unsigned *selector)
 635 {
 636         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 637         int rid = rdev_get_id(rdev);
 638         const struct voltage_map_desc *desc;
 639         int new_val, new_idx, damage, tmp_val, tmp_idx, tmp_dmg;
 640         bool gpio_dvs_mode = false;
 641
 642         if (rid < MAX8997_BUCK1 || rid > MAX8997_BUCK7)
 643                 return -EINVAL;
 644
 645         switch (rid) {
 646         case MAX8997_BUCK1:
 647                 if (max8997->buck1_gpiodvs)
 648                         gpio_dvs_mode = true;
 649                 break;
 650         case MAX8997_BUCK2:
 651                 if (max8997->buck2_gpiodvs)
 652                         gpio_dvs_mode = true;
 653                 break;
 654         case MAX8997_BUCK5:
 655                 if (max8997->buck5_gpiodvs)
 656                         gpio_dvs_mode = true;
 657                 break;
 658         }
 659
 660         if (!gpio_dvs_mode)
 661                 return max8997_set_voltage_ldobuck(rdev, min_uV, max_uV,
 662                                                 selector);
 663
 664         desc = reg_voltage_map[rid];
 665         new_val = max8997_get_voltage_proper_val(desc, min_uV, max_uV);
 666         if (new_val < 0)
 667                 return new_val;
 668
 669         tmp_dmg = INT_MAX;
 670         tmp_idx = -1;
 671         tmp_val = -1;
 672         do {
 673                 damage = max8997_assess_side_effect(rdev, new_val, &new_idx);
 674                 if (damage == 0)
 675                         goto out;
 676
 677                 if (tmp_dmg > damage) {
 678                         tmp_idx = new_idx;
 679                         tmp_val = new_val;
 680                         tmp_dmg = damage;
 681                 }
 682
 683                 new_val++;
 684         } while (desc->min + desc->step * new_val <= desc->max);
 685
 686         new_idx = tmp_idx;
 687         new_val = tmp_val;
 688
 689         if (max8997->ignore_gpiodvs_side_effect == false)
 690                 return -EINVAL;
 691
 692         dev_warn(&rdev->dev,
 693                 "MAX8997 GPIO-DVS Side Effect Warning: GPIO SET:  %d -> %d\n",
 694                 max8997->buck125_gpioindex, tmp_idx);
 695
 696 out:
 697         if (new_idx < 0 || new_val < 0)
 698                 return -EINVAL;
 699
 700         max8997->buck125_gpioindex = new_idx;
 701         max8997_set_gpio(max8997);
 702         *selector = new_val;
 703
 704         return 0;
 705 }
 706
 707 /* For SAFEOUT1 and SAFEOUT2 */
 708 static int max8997_set_voltage_safeout_sel(struct regulator_dev *rdev,
 709                                            unsigned selector)
 710 {
 711         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 712         struct i2c_client *i2c = max8997->iodev->i2c;
 713         int rid = rdev_get_id(rdev);
 714         int reg, shift = 0, mask, ret;
 715
 716         if (rid != MAX8997_ESAFEOUT1 && rid != MAX8997_ESAFEOUT2)
 717                 return -EINVAL;
 718
 719         ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
 720         if (ret)
 721                 return ret;
 722
 723         return max8997_update_reg(i2c, reg, selector << shift, mask << shift);
 724 }
 725
 726 static int max8997_reg_disable_suspend(struct regulator_dev *rdev)
 727 {
 728         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 729         struct i2c_client *i2c = max8997->iodev->i2c;
 730         int ret, reg, mask, pattern;
 731         int rid = rdev_get_id(rdev);
 732
 733         ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
 734         if (ret)
 735                 return ret;
 736
 737         max8997_read_reg(i2c, reg, &max8997->saved_states[rid]);
 738
 739         if (rid == MAX8997_LDO1 ||
 740                         rid == MAX8997_LDO10 ||
 741                         rid == MAX8997_LDO21) {
 742                 dev_dbg(&rdev->dev, "Conditional Power-Off for %s\n",
 743                                 rdev->desc->name);
 744                 return max8997_update_reg(i2c, reg, 0x40, mask);
 745         }
 746
 747         dev_dbg(&rdev->dev, "Full Power-Off for %s (%xh -> %xh)\n",
 748                         rdev->desc->name, max8997->saved_states[rid] & mask,
 749                         (~pattern) & mask);
 750         return max8997_update_reg(i2c, reg, ~pattern, mask);
 751 }
 752
 753 static struct regulator_ops max8997_ldo_ops = {
 754         .list_voltage           = max8997_list_voltage,
 755         .is_enabled             = max8997_reg_is_enabled,
 756         .enable                 = max8997_reg_enable,
 757         .disable                = max8997_reg_disable,
 758         .get_voltage_sel        = max8997_get_voltage_sel,
 759         .set_voltage            = max8997_set_voltage_ldobuck,
 760         .set_suspend_disable    = max8997_reg_disable_suspend,
 761 };
 762
 763 static struct regulator_ops max8997_buck_ops = {
 764         .list_voltage           = max8997_list_voltage,
 765         .is_enabled             = max8997_reg_is_enabled,
 766         .enable                 = max8997_reg_enable,
 767         .disable                = max8997_reg_disable,
 768         .get_voltage_sel        = max8997_get_voltage_sel,
 769         .set_voltage            = max8997_set_voltage_buck,
 770         .set_voltage_time_sel   = max8997_set_voltage_buck_time_sel,
 771         .set_suspend_disable    = max8997_reg_disable_suspend,
 772 };
 773
 774 static struct regulator_ops max8997_fixedvolt_ops = {
 775         .list_voltage           = max8997_list_voltage,
 776         .is_enabled             = max8997_reg_is_enabled,
 777         .enable                 = max8997_reg_enable,
 778         .disable                = max8997_reg_disable,
 779         .set_suspend_disable    = max8997_reg_disable_suspend,
 780 };
 781
 782 static struct regulator_ops max8997_safeout_ops = {
 783         .list_voltage           = regulator_list_voltage_table,
 784         .is_enabled             = max8997_reg_is_enabled,
 785         .enable                 = max8997_reg_enable,
 786         .disable                = max8997_reg_disable,
 787         .get_voltage_sel        = max8997_get_voltage_sel,
 788         .set_voltage_sel        = max8997_set_voltage_safeout_sel,
 789         .set_suspend_disable    = max8997_reg_disable_suspend,
 790 };
 791
 792 static struct regulator_ops max8997_fixedstate_ops = {
 793         .list_voltage           = max8997_list_voltage_charger_cv,
 794         .get_voltage_sel        = max8997_get_voltage_sel,
 795         .set_voltage            = max8997_set_voltage_charger_cv,
 796 };
 797
 798 static int max8997_set_current_limit(struct regulator_dev *rdev,
 799                                      int min_uA, int max_uA)
 800 {
 801         unsigned dummy;
 802         int rid = rdev_get_id(rdev);
 803
 804         if (rid != MAX8997_CHARGER && rid != MAX8997_CHARGER_TOPOFF)
 805                 return -EINVAL;
 806
 807         /* Reuse max8997_set_voltage_ldobuck to set current_limit. */
 808         return max8997_set_voltage_ldobuck(rdev, min_uA, max_uA, &dummy);
 809 }
 810
 811 static int max8997_get_current_limit(struct regulator_dev *rdev)
 812 {
 813         int sel, rid = rdev_get_id(rdev);
 814
 815         if (rid != MAX8997_CHARGER && rid != MAX8997_CHARGER_TOPOFF)
 816                 return -EINVAL;
 817
 818         sel = max8997_get_voltage_sel(rdev);
 819         if (sel < 0)
 820                 return sel;
 821
 822         /* Reuse max8997_list_voltage to get current_limit. */
 823         return max8997_list_voltage(rdev, sel);
 824 }
 825
 826 static struct regulator_ops max8997_charger_ops = {
 827         .is_enabled             = max8997_reg_is_enabled,
 828         .enable                 = max8997_reg_enable,
 829         .disable                = max8997_reg_disable,
 830         .get_current_limit      = max8997_get_current_limit,
 831         .set_current_limit      = max8997_set_current_limit,
 832 };
 833
 834 static struct regulator_ops max8997_charger_fixedstate_ops = {
 835         .get_current_limit      = max8997_get_current_limit,
 836         .set_current_limit      = max8997_set_current_limit,
 837 };
 838
 839 #define MAX8997_VOLTAGE_REGULATOR(_name, _ops) {\
 840         .name           = #_name,               \
 841         .id             = MAX8997_##_name,      \
 842         .ops            = &_ops,                \
 843         .type           = REGULATOR_VOLTAGE,    \
 844         .owner          = THIS_MODULE,          \
 845 }
 846
 847 #define MAX8997_CURRENT_REGULATOR(_name, _ops) {\
 848         .name           = #_name,               \
 849         .id             = MAX8997_##_name,      \
 850         .ops            = &_ops,                \
 851         .type           = REGULATOR_CURRENT,    \
 852         .owner          = THIS_MODULE,          \
 853 }
 854
 855 static struct regulator_desc regulators[] = {
 856         MAX8997_VOLTAGE_REGULATOR(LDO1, max8997_ldo_ops),
 857         MAX8997_VOLTAGE_REGULATOR(LDO2, max8997_ldo_ops),
 858         MAX8997_VOLTAGE_REGULATOR(LDO3, max8997_ldo_ops),
 859         MAX8997_VOLTAGE_REGULATOR(LDO4, max8997_ldo_ops),
 860         MAX8997_VOLTAGE_REGULATOR(LDO5, max8997_ldo_ops),
 861         MAX8997_VOLTAGE_REGULATOR(LDO6, max8997_ldo_ops),
 862         MAX8997_VOLTAGE_REGULATOR(LDO7, max8997_ldo_ops),
 863         MAX8997_VOLTAGE_REGULATOR(LDO8, max8997_ldo_ops),
 864         MAX8997_VOLTAGE_REGULATOR(LDO9, max8997_ldo_ops),
 865         MAX8997_VOLTAGE_REGULATOR(LDO10, max8997_ldo_ops),
 866         MAX8997_VOLTAGE_REGULATOR(LDO11, max8997_ldo_ops),
 867         MAX8997_VOLTAGE_REGULATOR(LDO12, max8997_ldo_ops),
 868         MAX8997_VOLTAGE_REGULATOR(LDO13, max8997_ldo_ops),
 869         MAX8997_VOLTAGE_REGULATOR(LDO14, max8997_ldo_ops),
 870         MAX8997_VOLTAGE_REGULATOR(LDO15, max8997_ldo_ops),
 871         MAX8997_VOLTAGE_REGULATOR(LDO16, max8997_ldo_ops),
 872         MAX8997_VOLTAGE_REGULATOR(LDO17, max8997_ldo_ops),
 873         MAX8997_VOLTAGE_REGULATOR(LDO18, max8997_ldo_ops),
 874         MAX8997_VOLTAGE_REGULATOR(LDO21, max8997_ldo_ops),
 875         MAX8997_VOLTAGE_REGULATOR(BUCK1, max8997_buck_ops),
 876         MAX8997_VOLTAGE_REGULATOR(BUCK2, max8997_buck_ops),
 877         MAX8997_VOLTAGE_REGULATOR(BUCK3, max8997_buck_ops),
 878         MAX8997_VOLTAGE_REGULATOR(BUCK4, max8997_buck_ops),
 879         MAX8997_VOLTAGE_REGULATOR(BUCK5, max8997_buck_ops),
 880         MAX8997_VOLTAGE_REGULATOR(BUCK6, max8997_fixedvolt_ops),
 881         MAX8997_VOLTAGE_REGULATOR(BUCK7, max8997_buck_ops),
 882         MAX8997_VOLTAGE_REGULATOR(EN32KHZ_AP, max8997_fixedvolt_ops),
 883         MAX8997_VOLTAGE_REGULATOR(EN32KHZ_CP, max8997_fixedvolt_ops),
 884         MAX8997_VOLTAGE_REGULATOR(ENVICHG, max8997_fixedvolt_ops),
 885         MAX8997_VOLTAGE_REGULATOR(ESAFEOUT1, max8997_safeout_ops),
 886         MAX8997_VOLTAGE_REGULATOR(ESAFEOUT2, max8997_safeout_ops),
 887         MAX8997_VOLTAGE_REGULATOR(CHARGER_CV, max8997_fixedstate_ops),
 888         MAX8997_CURRENT_REGULATOR(CHARGER, max8997_charger_ops),
 889         MAX8997_CURRENT_REGULATOR(CHARGER_TOPOFF,
 890                                   max8997_charger_fixedstate_ops),
 891 };
 892
 893 #ifdef CONFIG_OF
 894 static int max8997_pmic_dt_parse_dvs_gpio(struct platform_device *pdev,
 895                         struct max8997_platform_data *pdata,
 896                         struct device_node *pmic_np)
 897 {
 898         int i, gpio;
 899
 900         for (i = 0; i < 3; i++) {
 901                 gpio = of_get_named_gpio(pmic_np,
 902                                         "max8997,pmic-buck125-dvs-gpios", i);
 903                 if (!gpio_is_valid(gpio)) {
 904                         dev_err(&pdev->dev, "invalid gpio[%d]: %d\n", i, gpio);
 905                         return -EINVAL;
 906                 }
 907                 pdata->buck125_gpios[i] = gpio;
 908         }
 909         return 0;
 910 }
 911
 912 static int max8997_pmic_dt_parse_pdata(struct platform_device *pdev,
 913                                         struct max8997_platform_data *pdata)
 914 {
 915         struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 916         struct device_node *pmic_np, *regulators_np, *reg_np;
 917         struct max8997_regulator_data *rdata;
 918         unsigned int i, dvs_voltage_nr = 1, ret;
 919
 920         pmic_np = iodev->dev->of_node;
 921         if (!pmic_np) {
 922                 dev_err(&pdev->dev, "could not find pmic sub-node\n");
 923                 return -ENODEV;
 924         }
 925
 926         regulators_np = of_get_child_by_name(pmic_np, "regulators");
 927         if (!regulators_np) {
 928                 dev_err(&pdev->dev, "could not find regulators sub-node\n");
 929                 return -EINVAL;
 930         }
 931
 932         /* count the number of regulators to be supported in pmic */
 933         pdata->num_regulators = of_get_child_count(regulators_np);
 934
 935         rdata = devm_kzalloc(&pdev->dev, sizeof(*rdata) *
 936                                 pdata->num_regulators, GFP_KERNEL);
 937         if (!rdata) {
 938                 of_node_put(regulators_np);
 939                 return -ENOMEM;
 940         }
 941
 942         pdata->regulators = rdata;
 943         for_each_child_of_node(regulators_np, reg_np) {
 944                 for (i = 0; i < ARRAY_SIZE(regulators); i++)
 945                         if (!of_node_cmp(reg_np->name, regulators[i].name))
 946                                 break;
 947
 948                 if (i == ARRAY_SIZE(regulators)) {
 949                         dev_warn(&pdev->dev, "don't know how to configure regulator %s\n",
 950                                  reg_np->name);
 951                         continue;
 952                 }
 953
 954                 rdata->id = i;
 955                 rdata->initdata = of_get_regulator_init_data(&pdev->dev,
 956                                                              reg_np,
 957                                                              &regulators[i]);
 958                 rdata->reg_node = reg_np;
 959                 rdata++;
 960         }
 961         of_node_put(regulators_np);
 962
 963         if (of_get_property(pmic_np, "max8997,pmic-buck1-uses-gpio-dvs", NULL))
 964                 pdata->buck1_gpiodvs = true;
 965
 966         if (of_get_property(pmic_np, "max8997,pmic-buck2-uses-gpio-dvs", NULL))
 967                 pdata->buck2_gpiodvs = true;
 968
 969         if (of_get_property(pmic_np, "max8997,pmic-buck5-uses-gpio-dvs", NULL))
 970                 pdata->buck5_gpiodvs = true;
 971
 972         if (pdata->buck1_gpiodvs || pdata->buck2_gpiodvs ||
 973                                                 pdata->buck5_gpiodvs) {
 974                 ret = max8997_pmic_dt_parse_dvs_gpio(pdev, pdata, pmic_np);
 975                 if (ret)
 976                         return -EINVAL;
 977
 978                 if (of_property_read_u32(pmic_np,
 979                                 "max8997,pmic-buck125-default-dvs-idx",
 980                                 &pdata->buck125_default_idx)) {
 981                         pdata->buck125_default_idx = 0;
 982                 } else {
 983                         if (pdata->buck125_default_idx >= 8) {
 984                                 pdata->buck125_default_idx = 0;
 985                                 dev_info(&pdev->dev, "invalid value for default dvs index, using 0 instead\n");
 986                         }
 987                 }
 988
 989                 if (of_get_property(pmic_np,
 990                         "max8997,pmic-ignore-gpiodvs-side-effect", NULL))
 991                         pdata->ignore_gpiodvs_side_effect = true;
 992
 993                 dvs_voltage_nr = 8;
 994         }
 995
 996         if (of_property_read_u32_array(pmic_np,
 997                                 "max8997,pmic-buck1-dvs-voltage",
 998                                 pdata->buck1_voltage, dvs_voltage_nr)) {
 999                 dev_err(&pdev->dev, "buck1 voltages not specified\n");
1000                 return -EINVAL;
1001         }
1002
1003         if (of_property_read_u32_array(pmic_np,
1004                                 "max8997,pmic-buck2-dvs-voltage",
1005                                 pdata->buck2_voltage, dvs_voltage_nr)) {
1006                 dev_err(&pdev->dev, "buck2 voltages not specified\n");
1007                 return -EINVAL;
1008         }
1009
1010         if (of_property_read_u32_array(pmic_np,
1011                                 "max8997,pmic-buck5-dvs-voltage",
1012                                 pdata->buck5_voltage, dvs_voltage_nr)) {
1013                 dev_err(&pdev->dev, "buck5 voltages not specified\n");
1014                 return -EINVAL;
1015         }
1016
1017         return 0;
1018 }
1019 #else
1020 static int max8997_pmic_dt_parse_pdata(struct platform_device *pdev,
1021                                         struct max8997_platform_data *pdata)
1022 {
1023         return 0;
1024 }
1025 #endif /* CONFIG_OF */
1026
1027 static int max8997_pmic_probe(struct platform_device *pdev)
1028 {
1029         struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
1030         struct max8997_platform_data *pdata = iodev->pdata;
1031         struct regulator_config config = { };
1032         struct regulator_dev *rdev;
1033         struct max8997_data *max8997;
1034         struct i2c_client *i2c;
1035         int i, ret, nr_dvs;
1036         u8 max_buck1 = 0, max_buck2 = 0, max_buck5 = 0;
1037
1038         if (!pdata) {
1039                 dev_err(&pdev->dev, "No platform init data supplied.\n");
1040                 return -ENODEV;
1041         }
1042
1043         if (iodev->dev->of_node) {
1044                 ret = max8997_pmic_dt_parse_pdata(pdev, pdata);
1045                 if (ret)
1046                         return ret;
1047         }
1048
1049         max8997 = devm_kzalloc(&pdev->dev, sizeof(struct max8997_data),
1050                                GFP_KERNEL);
1051         if (!max8997)
1052                 return -ENOMEM;
1053
1054         max8997->dev = &pdev->dev;
1055         max8997->iodev = iodev;
1056         max8997->num_regulators = pdata->num_regulators;
1057         platform_set_drvdata(pdev, max8997);
1058         i2c = max8997->iodev->i2c;
1059
1060         max8997->buck125_gpioindex = pdata->buck125_default_idx;
1061         max8997->buck1_gpiodvs = pdata->buck1_gpiodvs;
1062         max8997->buck2_gpiodvs = pdata->buck2_gpiodvs;
1063         max8997->buck5_gpiodvs = pdata->buck5_gpiodvs;
1064         memcpy(max8997->buck125_gpios, pdata->buck125_gpios, sizeof(int) * 3);
1065         max8997->ignore_gpiodvs_side_effect = pdata->ignore_gpiodvs_side_effect;
1066
1067         nr_dvs = (pdata->buck1_gpiodvs || pdata->buck2_gpiodvs ||
1068                         pdata->buck5_gpiodvs) ? 8 : 1;
1069
1070         for (i = 0; i < nr_dvs; i++) {
1071                 max8997->buck1_vol[i] = ret =
1072                         max8997_get_voltage_proper_val(
1073                                         &buck1245_voltage_map_desc,
1074                                         pdata->buck1_voltage[i],
1075                                         pdata->buck1_voltage[i] +
1076                                         buck1245_voltage_map_desc.step);
1077                 if (ret < 0)
1078                         return ret;
1079
1080                 max8997->buck2_vol[i] = ret =
1081                         max8997_get_voltage_proper_val(
1082                                         &buck1245_voltage_map_desc,
1083                                         pdata->buck2_voltage[i],
1084                                         pdata->buck2_voltage[i] +
1085                                         buck1245_voltage_map_desc.step);
1086                 if (ret < 0)
1087                         return ret;
1088
1089                 max8997->buck5_vol[i] = ret =
1090                         max8997_get_voltage_proper_val(
1091                                         &buck1245_voltage_map_desc,
1092                                         pdata->buck5_voltage[i],
1093                                         pdata->buck5_voltage[i] +
1094                                         buck1245_voltage_map_desc.step);
1095                 if (ret < 0)
1096                         return ret;
1097
1098                 if (max_buck1 < max8997->buck1_vol[i])
1099                         max_buck1 = max8997->buck1_vol[i];
1100                 if (max_buck2 < max8997->buck2_vol[i])
1101                         max_buck2 = max8997->buck2_vol[i];
1102                 if (max_buck5 < max8997->buck5_vol[i])
1103                         max_buck5 = max8997->buck5_vol[i];
1104         }
1105
1106         /* For the safety, set max voltage before setting up */
1107         for (i = 0; i < 8; i++) {
1108                 max8997_update_reg(i2c, MAX8997_REG_BUCK1DVS1 + i,
1109                                 max_buck1, 0x3f);
1110                 max8997_update_reg(i2c, MAX8997_REG_BUCK2DVS1 + i,
1111                                 max_buck2, 0x3f);
1112                 max8997_update_reg(i2c, MAX8997_REG_BUCK5DVS1 + i,
1113                                 max_buck5, 0x3f);
1114         }
1115
1116         /* Initialize all the DVS related BUCK registers */
1117         for (i = 0; i < nr_dvs; i++) {
1118                 max8997_update_reg(i2c, MAX8997_REG_BUCK1DVS1 + i,
1119                                 max8997->buck1_vol[i],
1120                                 0x3f);
1121                 max8997_update_reg(i2c, MAX8997_REG_BUCK2DVS1 + i,
1122                                 max8997->buck2_vol[i],
1123                                 0x3f);
1124                 max8997_update_reg(i2c, MAX8997_REG_BUCK5DVS1 + i,
1125                                 max8997->buck5_vol[i],
1126                                 0x3f);
1127         }
1128
1129         /*
1130          * If buck 1, 2, and 5 do not care DVS GPIO settings, ignore them.
1131          * If at least one of them cares, set gpios.
1132          */
1133         if (pdata->buck1_gpiodvs || pdata->buck2_gpiodvs ||
1134                         pdata->buck5_gpiodvs) {
1135
1136                 if (!gpio_is_valid(pdata->buck125_gpios[0]) ||
1137                                 !gpio_is_valid(pdata->buck125_gpios[1]) ||
1138                                 !gpio_is_valid(pdata->buck125_gpios[2])) {
1139                         dev_err(&pdev->dev, "GPIO NOT VALID\n");
1140                         return -EINVAL;
1141                 }
1142
1143                 ret = devm_gpio_request(&pdev->dev, pdata->buck125_gpios[0],
1144                                         "MAX8997 SET1");
1145                 if (ret)
1146                         return ret;
1147
1148                 ret = devm_gpio_request(&pdev->dev, pdata->buck125_gpios[1],
1149                                         "MAX8997 SET2");
1150                 if (ret)
1151                         return ret;
1152
1153                 ret = devm_gpio_request(&pdev->dev, pdata->buck125_gpios[2],
1154                                 "MAX8997 SET3");
1155                 if (ret)
1156                         return ret;
1157
1158                 gpio_direction_output(pdata->buck125_gpios[0],
1159                                 (max8997->buck125_gpioindex >> 2)
1160                                 & 0x1); /* SET1 */
1161                 gpio_direction_output(pdata->buck125_gpios[1],
1162                                 (max8997->buck125_gpioindex >> 1)
1163                                 & 0x1); /* SET2 */
1164                 gpio_direction_output(pdata->buck125_gpios[2],
1165                                 (max8997->buck125_gpioindex >> 0)
1166                                 & 0x1); /* SET3 */
1167         }
1168
1169         /* DVS-GPIO disabled */
1170         max8997_update_reg(i2c, MAX8997_REG_BUCK1CTRL, (pdata->buck1_gpiodvs) ?
1171                         (1 << 1) : (0 << 1), 1 << 1);
1172         max8997_update_reg(i2c, MAX8997_REG_BUCK2CTRL, (pdata->buck2_gpiodvs) ?
1173                         (1 << 1) : (0 << 1), 1 << 1);
1174         max8997_update_reg(i2c, MAX8997_REG_BUCK5CTRL, (pdata->buck5_gpiodvs) ?
1175                         (1 << 1) : (0 << 1), 1 << 1);
1176
1177         /* Misc Settings */
1178         max8997->ramp_delay = 10; /* set 10mV/us, which is the default */
1179         max8997_write_reg(i2c, MAX8997_REG_BUCKRAMP, (0xf << 4) | 0x9);
1180
1181         for (i = 0; i < pdata->num_regulators; i++) {
1182                 const struct voltage_map_desc *desc;
1183                 int id = pdata->regulators[i].id;
1184
1185                 desc = reg_voltage_map[id];
1186                 if (desc) {
1187                         regulators[id].n_voltages =
1188                                 (desc->max - desc->min) / desc->step + 1;
1189                 } else if (id == MAX8997_ESAFEOUT1 || id == MAX8997_ESAFEOUT2) {
1190                         regulators[id].volt_table = safeoutvolt;
1191                         regulators[id].n_voltages = ARRAY_SIZE(safeoutvolt);
1192                 } else if (id == MAX8997_CHARGER_CV) {
1193                         regulators[id].n_voltages = 16;
1194                 }
1195
1196                 config.dev = max8997->dev;
1197                 config.init_data = pdata->regulators[i].initdata;
1198                 config.driver_data = max8997;
1199                 config.of_node = pdata->regulators[i].reg_node;
1200
1201                 rdev = devm_regulator_register(&pdev->dev, &regulators[id],
1202                                                &config);
1203                 if (IS_ERR(rdev)) {
1204                         dev_err(max8997->dev, "regulator init failed for %d\n",
1205                                         id);
1206                         return PTR_ERR(rdev);
1207                 }
1208         }
1209
1210         return 0;
1211 }
1212
1213 static const struct platform_device_id max8997_pmic_id[] = {
1214         { "max8997-pmic", 0},
1215         { },
1216 };
1217 MODULE_DEVICE_TABLE(platform, max8997_pmic_id);
1218
1219 static struct platform_driver max8997_pmic_driver = {
1220         .driver = {
1221                 .name = "max8997-pmic",
1222         },
1223         .probe = max8997_pmic_probe,
1224         .id_table = max8997_pmic_id,
1225 };
1226
1227 static int __init max8997_pmic_init(void)
1228 {
1229         return platform_driver_register(&max8997_pmic_driver);
1230 }
1231 subsys_initcall(max8997_pmic_init);
1232
1233 static void __exit max8997_pmic_cleanup(void)
1234 {
1235         platform_driver_unregister(&max8997_pmic_driver);
1236 }
1237 module_exit(max8997_pmic_cleanup);
1238
1239 MODULE_DESCRIPTION("MAXIM 8997/8966 Regulator Driver");
1240 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
1241 MODULE_LICENSE("GPL");