drivers/regulator/max8997-regulator.c

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