drivers/regulator/max8997-regulator.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 //
   3 // max8997.c - Regulator driver for the Maxim 8997/8966
   4 //
   5 // Copyright (C) 2011 Samsung Electronics
   6 // MyungJoo Ham <myungjoo.ham@samsung.com>
   7 //
   8 // This driver is based on max8998.c
   9
  10 #include <linux/bug.h>
  11 #include <linux/err.h>
  12 #include <linux/gpio.h>
  13 #include <linux/of_gpio.h>
  14 #include <linux/slab.h>
  15 #include <linux/module.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/regulator/driver.h>
  18 #include <linux/regulator/machine.h>
  19 #include <linux/mfd/max8997.h>
  20 #include <linux/mfd/max8997-private.h>
  21 #include <linux/regulator/of_regulator.h>
  22
  23 struct max8997_data {
  24         struct device *dev;
  25         struct max8997_dev *iodev;
  26         int num_regulators;
  27         int ramp_delay; /* in mV/us */
  28
  29         bool buck1_gpiodvs;
  30         bool buck2_gpiodvs;
  31         bool buck5_gpiodvs;
  32         u8 buck1_vol[8];
  33         u8 buck2_vol[8];
  34         u8 buck5_vol[8];
  35         int buck125_gpios[3];
  36         int buck125_gpioindex;
  37         bool ignore_gpiodvs_side_effect;
  38
  39         u8 saved_states[MAX8997_REG_MAX];
  40 };
  41
  42 static const unsigned int safeoutvolt[] = {
  43         4850000,
  44         4900000,
  45         4950000,
  46         3300000,
  47 };
  48
  49 static inline void max8997_set_gpio(struct max8997_data *max8997)
  50 {
  51         int set3 = (max8997->buck125_gpioindex) & 0x1;
  52         int set2 = ((max8997->buck125_gpioindex) >> 1) & 0x1;
  53         int set1 = ((max8997->buck125_gpioindex) >> 2) & 0x1;
  54
  55         gpio_set_value(max8997->buck125_gpios[0], set1);
  56         gpio_set_value(max8997->buck125_gpios[1], set2);
  57         gpio_set_value(max8997->buck125_gpios[2], set3);
  58 }
  59
  60 struct voltage_map_desc {
  61         int min;
  62         int max;
  63         int step;
  64 };
  65
  66 /* Voltage maps in uV */
  67 static const struct voltage_map_desc ldo_voltage_map_desc = {
  68         .min = 800000,  .max = 3950000, .step = 50000,
  69 }; /* LDO1 ~ 18, 21 all */
  70
  71 static const struct voltage_map_desc buck1245_voltage_map_desc = {
  72         .min = 650000,  .max = 2225000, .step = 25000,
  73 }; /* Buck1, 2, 4, 5 */
  74
  75 static const struct voltage_map_desc buck37_voltage_map_desc = {
  76         .min = 750000,  .max = 3900000, .step = 50000,
  77 }; /* Buck3, 7 */
  78
  79 /* current map in uA */
  80 static const struct voltage_map_desc charger_current_map_desc = {
  81         .min = 200000,  .max = 950000,  .step = 50000,
  82 };
  83
  84 static const struct voltage_map_desc topoff_current_map_desc = {
  85         .min = 50000,   .max = 200000,  .step = 10000,
  86 };
  87
  88 static const struct voltage_map_desc *reg_voltage_map[] = {
  89         [MAX8997_LDO1] = &ldo_voltage_map_desc,
  90         [MAX8997_LDO2] = &ldo_voltage_map_desc,
  91         [MAX8997_LDO3] = &ldo_voltage_map_desc,
  92         [MAX8997_LDO4] = &ldo_voltage_map_desc,
  93         [MAX8997_LDO5] = &ldo_voltage_map_desc,
  94         [MAX8997_LDO6] = &ldo_voltage_map_desc,
  95         [MAX8997_LDO7] = &ldo_voltage_map_desc,
  96         [MAX8997_LDO8] = &ldo_voltage_map_desc,
  97         [MAX8997_LDO9] = &ldo_voltage_map_desc,
  98         [MAX8997_LDO10] = &ldo_voltage_map_desc,
  99         [MAX8997_LDO11] = &ldo_voltage_map_desc,
 100         [MAX8997_LDO12] = &ldo_voltage_map_desc,
 101         [MAX8997_LDO13] = &ldo_voltage_map_desc,
 102         [MAX8997_LDO14] = &ldo_voltage_map_desc,
 103         [MAX8997_LDO15] = &ldo_voltage_map_desc,
 104         [MAX8997_LDO16] = &ldo_voltage_map_desc,
 105         [MAX8997_LDO17] = &ldo_voltage_map_desc,
 106         [MAX8997_LDO18] = &ldo_voltage_map_desc,
 107         [MAX8997_LDO21] = &ldo_voltage_map_desc,
 108         [MAX8997_BUCK1] = &buck1245_voltage_map_desc,
 109         [MAX8997_BUCK2] = &buck1245_voltage_map_desc,
 110         [MAX8997_BUCK3] = &buck37_voltage_map_desc,
 111         [MAX8997_BUCK4] = &buck1245_voltage_map_desc,
 112         [MAX8997_BUCK5] = &buck1245_voltage_map_desc,
 113         [MAX8997_BUCK6] = NULL,
 114         [MAX8997_BUCK7] = &buck37_voltage_map_desc,
 115         [MAX8997_EN32KHZ_AP] = NULL,
 116         [MAX8997_EN32KHZ_CP] = NULL,
 117         [MAX8997_ENVICHG] = NULL,
 118         [MAX8997_ESAFEOUT1] = NULL,
 119         [MAX8997_ESAFEOUT2] = NULL,
 120         [MAX8997_CHARGER_CV] = NULL,
 121         [MAX8997_CHARGER] = &charger_current_map_desc,
 122         [MAX8997_CHARGER_TOPOFF] = &topoff_current_map_desc,
 123 };
 124
 125 static int max8997_list_voltage_charger_cv(struct regulator_dev *rdev,
 126                 unsigned int selector)
 127 {
 128         int rid = rdev_get_id(rdev);
 129
 130         if (rid != MAX8997_CHARGER_CV)
 131                 goto err;
 132
 133         switch (selector) {
 134         case 0x00:
 135                 return 4200000;
 136         case 0x01 ... 0x0E:
 137                 return 4000000 + 20000 * (selector - 0x01);
 138         case 0x0F:
 139                 return 4350000;
 140         default:
 141                 return -EINVAL;
 142         }
 143 err:
 144         return -EINVAL;
 145 }
 146
 147 static int max8997_list_voltage(struct regulator_dev *rdev,
 148                 unsigned int selector)
 149 {
 150         const struct voltage_map_desc *desc;
 151         int rid = rdev_get_id(rdev);
 152         int val;
 153
 154         if (rid < 0 || rid >= ARRAY_SIZE(reg_voltage_map))
 155                 return -EINVAL;
 156
 157         desc = reg_voltage_map[rid];
 158         if (desc == NULL)
 159                 return -EINVAL;
 160
 161         val = desc->min + desc->step * selector;
 162         if (val > desc->max)
 163                 return -EINVAL;
 164
 165         return val;
 166 }
 167
 168 static int max8997_get_enable_register(struct regulator_dev *rdev,
 169                 int *reg, int *mask, int *pattern)
 170 {
 171         int rid = rdev_get_id(rdev);
 172
 173         switch (rid) {
 174         case MAX8997_LDO1 ... MAX8997_LDO21:
 175                 *reg = MAX8997_REG_LDO1CTRL + (rid - MAX8997_LDO1);
 176                 *mask = 0xC0;
 177                 *pattern = 0xC0;
 178                 break;
 179         case MAX8997_BUCK1:
 180                 *reg = MAX8997_REG_BUCK1CTRL;
 181                 *mask = 0x01;
 182                 *pattern = 0x01;
 183                 break;
 184         case MAX8997_BUCK2:
 185                 *reg = MAX8997_REG_BUCK2CTRL;
 186                 *mask = 0x01;
 187                 *pattern = 0x01;
 188                 break;
 189         case MAX8997_BUCK3:
 190                 *reg = MAX8997_REG_BUCK3CTRL;
 191                 *mask = 0x01;
 192                 *pattern = 0x01;
 193                 break;
 194         case MAX8997_BUCK4:
 195                 *reg = MAX8997_REG_BUCK4CTRL;
 196                 *mask = 0x01;
 197                 *pattern = 0x01;
 198                 break;
 199         case MAX8997_BUCK5:
 200                 *reg = MAX8997_REG_BUCK5CTRL;
 201                 *mask = 0x01;
 202                 *pattern = 0x01;
 203                 break;
 204         case MAX8997_BUCK6:
 205                 *reg = MAX8997_REG_BUCK6CTRL;
 206                 *mask = 0x01;
 207                 *pattern = 0x01;
 208                 break;
 209         case MAX8997_BUCK7:
 210                 *reg = MAX8997_REG_BUCK7CTRL;
 211                 *mask = 0x01;
 212                 *pattern = 0x01;
 213                 break;
 214         case MAX8997_EN32KHZ_AP ... MAX8997_EN32KHZ_CP:
 215                 *reg = MAX8997_REG_MAINCON1;
 216                 *mask = 0x01 << (rid - MAX8997_EN32KHZ_AP);
 217                 *pattern = 0x01 << (rid - MAX8997_EN32KHZ_AP);
 218                 break;
 219         case MAX8997_ENVICHG:
 220                 *reg = MAX8997_REG_MBCCTRL1;
 221                 *mask = 0x80;
 222                 *pattern = 0x80;
 223                 break;
 224         case MAX8997_ESAFEOUT1 ... MAX8997_ESAFEOUT2:
 225                 *reg = MAX8997_REG_SAFEOUTCTRL;
 226                 *mask = 0x40 << (rid - MAX8997_ESAFEOUT1);
 227                 *pattern = 0x40 << (rid - MAX8997_ESAFEOUT1);
 228                 break;
 229         case MAX8997_CHARGER:
 230                 *reg = MAX8997_REG_MBCCTRL2;
 231                 *mask = 0x40;
 232                 *pattern = 0x40;
 233                 break;
 234         default:
 235                 /* Not controllable or not exists */
 236                 return -EINVAL;
 237         }
 238
 239         return 0;
 240 }
 241
 242 static int max8997_reg_is_enabled(struct regulator_dev *rdev)
 243 {
 244         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 245         struct i2c_client *i2c = max8997->iodev->i2c;
 246         int ret, reg, mask, pattern;
 247         u8 val;
 248
 249         ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
 250         if (ret)
 251                 return ret;
 252
 253         ret = max8997_read_reg(i2c, reg, &val);
 254         if (ret)
 255                 return ret;
 256
 257         return (val & mask) == pattern;
 258 }
 259
 260 static int max8997_reg_enable(struct regulator_dev *rdev)
 261 {
 262         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 263         struct i2c_client *i2c = max8997->iodev->i2c;
 264         int ret, reg, mask, pattern;
 265
 266         ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
 267         if (ret)
 268                 return ret;
 269
 270         return max8997_update_reg(i2c, reg, pattern, mask);
 271 }
 272
 273 static int max8997_reg_disable(struct regulator_dev *rdev)
 274 {
 275         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 276         struct i2c_client *i2c = max8997->iodev->i2c;
 277         int ret, reg, mask, pattern;
 278
 279         ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
 280         if (ret)
 281                 return ret;
 282
 283         return max8997_update_reg(i2c, reg, ~pattern, mask);
 284 }
 285
 286 static int max8997_get_voltage_register(struct regulator_dev *rdev,
 287                 int *_reg, int *_shift, int *_mask)
 288 {
 289         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 290         int rid = rdev_get_id(rdev);
 291         int reg, shift = 0, mask = 0x3f;
 292
 293         switch (rid) {
 294         case MAX8997_LDO1 ... MAX8997_LDO21:
 295                 reg = MAX8997_REG_LDO1CTRL + (rid - MAX8997_LDO1);
 296                 break;
 297         case MAX8997_BUCK1:
 298                 reg = MAX8997_REG_BUCK1DVS1;
 299                 if (max8997->buck1_gpiodvs)
 300                         reg += max8997->buck125_gpioindex;
 301                 break;
 302         case MAX8997_BUCK2:
 303                 reg = MAX8997_REG_BUCK2DVS1;
 304                 if (max8997->buck2_gpiodvs)
 305                         reg += max8997->buck125_gpioindex;
 306                 break;
 307         case MAX8997_BUCK3:
 308                 reg = MAX8997_REG_BUCK3DVS;
 309                 break;
 310         case MAX8997_BUCK4:
 311                 reg = MAX8997_REG_BUCK4DVS;
 312                 break;
 313         case MAX8997_BUCK5:
 314                 reg = MAX8997_REG_BUCK5DVS1;
 315                 if (max8997->buck5_gpiodvs)
 316                         reg += max8997->buck125_gpioindex;
 317                 break;
 318         case MAX8997_BUCK7:
 319                 reg = MAX8997_REG_BUCK7DVS;
 320                 break;
 321         case MAX8997_ESAFEOUT1 ...  MAX8997_ESAFEOUT2:
 322                 reg = MAX8997_REG_SAFEOUTCTRL;
 323                 shift = (rid == MAX8997_ESAFEOUT2) ? 2 : 0;
 324                 mask = 0x3;
 325                 break;
 326         case MAX8997_CHARGER_CV:
 327                 reg = MAX8997_REG_MBCCTRL3;
 328                 shift = 0;
 329                 mask = 0xf;
 330                 break;
 331         case MAX8997_CHARGER:
 332                 reg = MAX8997_REG_MBCCTRL4;
 333                 shift = 0;
 334                 mask = 0xf;
 335                 break;
 336         case MAX8997_CHARGER_TOPOFF:
 337                 reg = MAX8997_REG_MBCCTRL5;
 338                 shift = 0;
 339                 mask = 0xf;
 340                 break;
 341         default:
 342                 return -EINVAL;
 343         }
 344
 345         *_reg = reg;
 346         *_shift = shift;
 347         *_mask = mask;
 348
 349         return 0;
 350 }
 351
 352 static int max8997_get_voltage_sel(struct regulator_dev *rdev)
 353 {
 354         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 355         struct i2c_client *i2c = max8997->iodev->i2c;
 356         int reg, shift, mask, ret;
 357         u8 val;
 358
 359         ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
 360         if (ret)
 361                 return ret;
 362
 363         ret = max8997_read_reg(i2c, reg, &val);
 364         if (ret)
 365                 return ret;
 366
 367         val >>= shift;
 368         val &= mask;
 369
 370         return val;
 371 }
 372
 373 static inline int max8997_get_voltage_proper_val(
 374                 const struct voltage_map_desc *desc,
 375                 int min_vol, int max_vol)
 376 {
 377         int i;
 378
 379         if (desc == NULL)
 380                 return -EINVAL;
 381
 382         if (max_vol < desc->min || min_vol > desc->max)
 383                 return -EINVAL;
 384
 385         if (min_vol < desc->min)
 386                 min_vol = desc->min;
 387
 388         i = DIV_ROUND_UP(min_vol - desc->min, desc->step);
 389
 390         if (desc->min + desc->step * i > max_vol)
 391                 return -EINVAL;
 392
 393         return i;
 394 }
 395
 396 static int max8997_set_voltage_charger_cv(struct regulator_dev *rdev,
 397                 int min_uV, int max_uV, unsigned *selector)
 398 {
 399         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 400         struct i2c_client *i2c = max8997->iodev->i2c;
 401         int rid = rdev_get_id(rdev);
 402         int lb, ub;
 403         int reg, shift = 0, mask, ret = 0;
 404         u8 val = 0x0;
 405
 406         if (rid != MAX8997_CHARGER_CV)
 407                 return -EINVAL;
 408
 409         ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
 410         if (ret)
 411                 return ret;
 412
 413         if (max_uV < 4000000 || min_uV > 4350000)
 414                 return -EINVAL;
 415
 416         if (min_uV <= 4000000)
 417                 val = 0x1;
 418         else if (min_uV <= 4200000 && max_uV >= 4200000)
 419                 val = 0x0;
 420         else {
 421                 lb = (min_uV - 4000001) / 20000 + 2;
 422                 ub = (max_uV - 4000000) / 20000 + 1;
 423
 424                 if (lb > ub)
 425                         return -EINVAL;
 426
 427                 if (lb < 0xf)
 428                         val = lb;
 429                 else {
 430                         if (ub >= 0xf)
 431                                 val = 0xf;
 432                         else
 433                                 return -EINVAL;
 434                 }
 435         }
 436
 437         *selector = val;
 438
 439         ret = max8997_update_reg(i2c, reg, val << shift, mask);
 440
 441         return ret;
 442 }
 443
 444 /*
 445  * For LDO1 ~ LDO21, BUCK1~5, BUCK7, CHARGER, CHARGER_TOPOFF
 446  * BUCK1, 2, and 5 are available if they are not controlled by gpio
 447  */
 448 static int max8997_set_voltage_ldobuck(struct regulator_dev *rdev,
 449                 int min_uV, int max_uV, unsigned *selector)
 450 {
 451         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 452         struct i2c_client *i2c = max8997->iodev->i2c;
 453         const struct voltage_map_desc *desc;
 454         int rid = rdev_get_id(rdev);
 455         int i, reg, shift, mask, ret;
 456
 457         switch (rid) {
 458         case MAX8997_LDO1 ... MAX8997_LDO21:
 459                 break;
 460         case MAX8997_BUCK1 ... MAX8997_BUCK5:
 461                 break;
 462         case MAX8997_BUCK6:
 463                 return -EINVAL;
 464         case MAX8997_BUCK7:
 465                 break;
 466         case MAX8997_CHARGER:
 467                 break;
 468         case MAX8997_CHARGER_TOPOFF:
 469                 break;
 470         default:
 471                 return -EINVAL;
 472         }
 473
 474         desc = reg_voltage_map[rid];
 475
 476         i = max8997_get_voltage_proper_val(desc, min_uV, max_uV);
 477         if (i < 0)
 478                 return i;
 479
 480         ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
 481         if (ret)
 482                 return ret;
 483
 484         ret = max8997_update_reg(i2c, reg, i << shift, mask << shift);
 485         *selector = i;
 486
 487         return ret;
 488 }
 489
 490 static int max8997_set_voltage_buck_time_sel(struct regulator_dev *rdev,
 491                                                 unsigned int old_selector,
 492                                                 unsigned int new_selector)
 493 {
 494         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 495         int rid = rdev_get_id(rdev);
 496         const struct voltage_map_desc *desc = reg_voltage_map[rid];
 497
 498         /* Delay is required only if the voltage is increasing */
 499         if (old_selector >= new_selector)
 500                 return 0;
 501
 502         /* No need to delay if gpio_dvs_mode */
 503         switch (rid) {
 504         case MAX8997_BUCK1:
 505                 if (max8997->buck1_gpiodvs)
 506                         return 0;
 507                 break;
 508         case MAX8997_BUCK2:
 509                 if (max8997->buck2_gpiodvs)
 510                         return 0;
 511                 break;
 512         case MAX8997_BUCK5:
 513                 if (max8997->buck5_gpiodvs)
 514                         return 0;
 515                 break;
 516         }
 517
 518         switch (rid) {
 519         case MAX8997_BUCK1:
 520         case MAX8997_BUCK2:
 521         case MAX8997_BUCK4:
 522         case MAX8997_BUCK5:
 523                 return DIV_ROUND_UP(desc->step * (new_selector - old_selector),
 524                                     max8997->ramp_delay * 1000);
 525         }
 526
 527         return 0;
 528 }
 529
 530 /*
 531  * Assess the damage on the voltage setting of BUCK1,2,5 by the change.
 532  *
 533  * When GPIO-DVS mode is used for multiple bucks, changing the voltage value
 534  * of one of the bucks may affect that of another buck, which is the side
 535  * effect of the change (set_voltage). This function examines the GPIO-DVS
 536  * configurations and checks whether such side-effect exists.
 537  */
 538 static int max8997_assess_side_effect(struct regulator_dev *rdev,
 539                 u8 new_val, int *best)
 540 {
 541         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 542         int rid = rdev_get_id(rdev);
 543         u8 *buckx_val[3];
 544         bool buckx_gpiodvs[3];
 545         int side_effect[8];
 546         int min_side_effect = INT_MAX;
 547         int i;
 548
 549         *best = -1;
 550
 551         switch (rid) {
 552         case MAX8997_BUCK1:
 553                 rid = 0;
 554                 break;
 555         case MAX8997_BUCK2:
 556                 rid = 1;
 557                 break;
 558         case MAX8997_BUCK5:
 559                 rid = 2;
 560                 break;
 561         default:
 562                 return -EINVAL;
 563         }
 564
 565         buckx_val[0] = max8997->buck1_vol;
 566         buckx_val[1] = max8997->buck2_vol;
 567         buckx_val[2] = max8997->buck5_vol;
 568         buckx_gpiodvs[0] = max8997->buck1_gpiodvs;
 569         buckx_gpiodvs[1] = max8997->buck2_gpiodvs;
 570         buckx_gpiodvs[2] = max8997->buck5_gpiodvs;
 571
 572         for (i = 0; i < 8; i++) {
 573                 int others;
 574
 575                 if (new_val != (buckx_val[rid])[i]) {
 576                         side_effect[i] = -1;
 577                         continue;
 578                 }
 579
 580                 side_effect[i] = 0;
 581                 for (others = 0; others < 3; others++) {
 582                         int diff;
 583
 584                         if (others == rid)
 585                                 continue;
 586                         if (buckx_gpiodvs[others] == false)
 587                                 continue; /* Not affected */
 588                         diff = (buckx_val[others])[i] -
 589                                 (buckx_val[others])[max8997->buck125_gpioindex];
 590                         if (diff > 0)
 591                                 side_effect[i] += diff;
 592                         else if (diff < 0)
 593                                 side_effect[i] -= diff;
 594                 }
 595                 if (side_effect[i] == 0) {
 596                         *best = i;
 597                         return 0; /* NO SIDE EFFECT! Use This! */
 598                 }
 599                 if (side_effect[i] < min_side_effect) {
 600                         min_side_effect = side_effect[i];
 601                         *best = i;
 602                 }
 603         }
 604
 605         if (*best == -1)
 606                 return -EINVAL;
 607
 608         return side_effect[*best];
 609 }
 610
 611 /*
 612  * For Buck 1 ~ 5 and 7. If it is not controlled by GPIO, this calls
 613  * max8997_set_voltage_ldobuck to do the job.
 614  */
 615 static int max8997_set_voltage_buck(struct regulator_dev *rdev,
 616                 int min_uV, int max_uV, unsigned *selector)
 617 {
 618         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 619         int rid = rdev_get_id(rdev);
 620         const struct voltage_map_desc *desc;
 621         int new_val, new_idx, damage, tmp_val, tmp_idx, tmp_dmg;
 622         bool gpio_dvs_mode = false;
 623
 624         if (rid < MAX8997_BUCK1 || rid > MAX8997_BUCK7)
 625                 return -EINVAL;
 626
 627         switch (rid) {
 628         case MAX8997_BUCK1:
 629                 if (max8997->buck1_gpiodvs)
 630                         gpio_dvs_mode = true;
 631                 break;
 632         case MAX8997_BUCK2:
 633                 if (max8997->buck2_gpiodvs)
 634                         gpio_dvs_mode = true;
 635                 break;
 636         case MAX8997_BUCK5:
 637                 if (max8997->buck5_gpiodvs)
 638                         gpio_dvs_mode = true;
 639                 break;
 640         }
 641
 642         if (!gpio_dvs_mode)
 643                 return max8997_set_voltage_ldobuck(rdev, min_uV, max_uV,
 644                                                 selector);
 645
 646         desc = reg_voltage_map[rid];
 647         new_val = max8997_get_voltage_proper_val(desc, min_uV, max_uV);
 648         if (new_val < 0)
 649                 return new_val;
 650
 651         tmp_dmg = INT_MAX;
 652         tmp_idx = -1;
 653         tmp_val = -1;
 654         do {
 655                 damage = max8997_assess_side_effect(rdev, new_val, &new_idx);
 656                 if (damage == 0)
 657                         goto out;
 658
 659                 if (tmp_dmg > damage) {
 660                         tmp_idx = new_idx;
 661                         tmp_val = new_val;
 662                         tmp_dmg = damage;
 663                 }
 664
 665                 new_val++;
 666         } while (desc->min + desc->step * new_val <= desc->max);
 667
 668         new_idx = tmp_idx;
 669         new_val = tmp_val;
 670
 671         if (max8997->ignore_gpiodvs_side_effect == false)
 672                 return -EINVAL;
 673
 674         dev_warn(&rdev->dev,
 675                 "MAX8997 GPIO-DVS Side Effect Warning: GPIO SET:  %d -> %d\n",
 676                 max8997->buck125_gpioindex, tmp_idx);
 677
 678 out:
 679         if (new_idx < 0 || new_val < 0)
 680                 return -EINVAL;
 681
 682         max8997->buck125_gpioindex = new_idx;
 683         max8997_set_gpio(max8997);
 684         *selector = new_val;
 685
 686         return 0;
 687 }
 688
 689 /* For SAFEOUT1 and SAFEOUT2 */
 690 static int max8997_set_voltage_safeout_sel(struct regulator_dev *rdev,
 691                                            unsigned selector)
 692 {
 693         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 694         struct i2c_client *i2c = max8997->iodev->i2c;
 695         int rid = rdev_get_id(rdev);
 696         int reg, shift = 0, mask, ret;
 697
 698         if (rid != MAX8997_ESAFEOUT1 && rid != MAX8997_ESAFEOUT2)
 699                 return -EINVAL;
 700
 701         ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
 702         if (ret)
 703                 return ret;
 704
 705         return max8997_update_reg(i2c, reg, selector << shift, mask << shift);
 706 }
 707
 708 static int max8997_reg_disable_suspend(struct regulator_dev *rdev)
 709 {
 710         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 711         struct i2c_client *i2c = max8997->iodev->i2c;
 712         int ret, reg, mask, pattern;
 713         int rid = rdev_get_id(rdev);
 714
 715         ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
 716         if (ret)
 717                 return ret;
 718
 719         max8997_read_reg(i2c, reg, &max8997->saved_states[rid]);
 720
 721         if (rid == MAX8997_LDO1 ||
 722                         rid == MAX8997_LDO10 ||
 723                         rid == MAX8997_LDO21) {
 724                 dev_dbg(&rdev->dev, "Conditional Power-Off for %s\n",
 725                                 rdev->desc->name);
 726                 return max8997_update_reg(i2c, reg, 0x40, mask);
 727         }
 728
 729         dev_dbg(&rdev->dev, "Full Power-Off for %s (%xh -> %xh)\n",
 730                         rdev->desc->name, max8997->saved_states[rid] & mask,
 731                         (~pattern) & mask);
 732         return max8997_update_reg(i2c, reg, ~pattern, mask);
 733 }
 734
 735 static struct regulator_ops max8997_ldo_ops = {
 736         .list_voltage           = max8997_list_voltage,
 737         .is_enabled             = max8997_reg_is_enabled,
 738         .enable                 = max8997_reg_enable,
 739         .disable                = max8997_reg_disable,
 740         .get_voltage_sel        = max8997_get_voltage_sel,
 741         .set_voltage            = max8997_set_voltage_ldobuck,
 742         .set_suspend_disable    = max8997_reg_disable_suspend,
 743 };
 744
 745 static struct regulator_ops max8997_buck_ops = {
 746         .list_voltage           = max8997_list_voltage,
 747         .is_enabled             = max8997_reg_is_enabled,
 748         .enable                 = max8997_reg_enable,
 749         .disable                = max8997_reg_disable,
 750         .get_voltage_sel        = max8997_get_voltage_sel,
 751         .set_voltage            = max8997_set_voltage_buck,
 752         .set_voltage_time_sel   = max8997_set_voltage_buck_time_sel,
 753         .set_suspend_disable    = max8997_reg_disable_suspend,
 754 };
 755
 756 static struct regulator_ops max8997_fixedvolt_ops = {
 757         .list_voltage           = max8997_list_voltage,
 758         .is_enabled             = max8997_reg_is_enabled,
 759         .enable                 = max8997_reg_enable,
 760         .disable                = max8997_reg_disable,
 761         .set_suspend_disable    = max8997_reg_disable_suspend,
 762 };
 763
 764 static struct regulator_ops max8997_safeout_ops = {
 765         .list_voltage           = regulator_list_voltage_table,
 766         .is_enabled             = max8997_reg_is_enabled,
 767         .enable                 = max8997_reg_enable,
 768         .disable                = max8997_reg_disable,
 769         .get_voltage_sel        = max8997_get_voltage_sel,
 770         .set_voltage_sel        = max8997_set_voltage_safeout_sel,
 771         .set_suspend_disable    = max8997_reg_disable_suspend,
 772 };
 773
 774 static struct regulator_ops max8997_fixedstate_ops = {
 775         .list_voltage           = max8997_list_voltage_charger_cv,
 776         .get_voltage_sel        = max8997_get_voltage_sel,
 777         .set_voltage            = max8997_set_voltage_charger_cv,
 778 };
 779
 780 static int max8997_set_current_limit(struct regulator_dev *rdev,
 781                                      int min_uA, int max_uA)
 782 {
 783         unsigned dummy;
 784         int rid = rdev_get_id(rdev);
 785
 786         if (rid != MAX8997_CHARGER && rid != MAX8997_CHARGER_TOPOFF)
 787                 return -EINVAL;
 788
 789         /* Reuse max8997_set_voltage_ldobuck to set current_limit. */
 790         return max8997_set_voltage_ldobuck(rdev, min_uA, max_uA, &dummy);
 791 }
 792
 793 static int max8997_get_current_limit(struct regulator_dev *rdev)
 794 {
 795         int sel, rid = rdev_get_id(rdev);
 796
 797         if (rid != MAX8997_CHARGER && rid != MAX8997_CHARGER_TOPOFF)
 798                 return -EINVAL;
 799
 800         sel = max8997_get_voltage_sel(rdev);
 801         if (sel < 0)
 802                 return sel;
 803
 804         /* Reuse max8997_list_voltage to get current_limit. */
 805         return max8997_list_voltage(rdev, sel);
 806 }
 807
 808 static struct regulator_ops max8997_charger_ops = {
 809         .is_enabled             = max8997_reg_is_enabled,
 810         .enable                 = max8997_reg_enable,
 811         .disable                = max8997_reg_disable,
 812         .get_current_limit      = max8997_get_current_limit,
 813         .set_current_limit      = max8997_set_current_limit,
 814 };
 815
 816 static struct regulator_ops max8997_charger_fixedstate_ops = {
 817         .get_current_limit      = max8997_get_current_limit,
 818         .set_current_limit      = max8997_set_current_limit,
 819 };
 820
 821 #define MAX8997_VOLTAGE_REGULATOR(_name, _ops) {\
 822         .name           = #_name,               \
 823         .id             = MAX8997_##_name,      \
 824         .ops            = &_ops,                \
 825         .type           = REGULATOR_VOLTAGE,    \
 826         .owner          = THIS_MODULE,          \
 827 }
 828
 829 #define MAX8997_CURRENT_REGULATOR(_name, _ops) {\
 830         .name           = #_name,               \
 831         .id             = MAX8997_##_name,      \
 832         .ops            = &_ops,                \
 833         .type           = REGULATOR_CURRENT,    \
 834         .owner          = THIS_MODULE,          \
 835 }
 836
 837 static struct regulator_desc regulators[] = {
 838         MAX8997_VOLTAGE_REGULATOR(LDO1, max8997_ldo_ops),
 839         MAX8997_VOLTAGE_REGULATOR(LDO2, max8997_ldo_ops),
 840         MAX8997_VOLTAGE_REGULATOR(LDO3, max8997_ldo_ops),
 841         MAX8997_VOLTAGE_REGULATOR(LDO4, max8997_ldo_ops),
 842         MAX8997_VOLTAGE_REGULATOR(LDO5, max8997_ldo_ops),
 843         MAX8997_VOLTAGE_REGULATOR(LDO6, max8997_ldo_ops),
 844         MAX8997_VOLTAGE_REGULATOR(LDO7, max8997_ldo_ops),
 845         MAX8997_VOLTAGE_REGULATOR(LDO8, max8997_ldo_ops),
 846         MAX8997_VOLTAGE_REGULATOR(LDO9, max8997_ldo_ops),
 847         MAX8997_VOLTAGE_REGULATOR(LDO10, max8997_ldo_ops),
 848         MAX8997_VOLTAGE_REGULATOR(LDO11, max8997_ldo_ops),
 849         MAX8997_VOLTAGE_REGULATOR(LDO12, max8997_ldo_ops),
 850         MAX8997_VOLTAGE_REGULATOR(LDO13, max8997_ldo_ops),
 851         MAX8997_VOLTAGE_REGULATOR(LDO14, max8997_ldo_ops),
 852         MAX8997_VOLTAGE_REGULATOR(LDO15, max8997_ldo_ops),
 853         MAX8997_VOLTAGE_REGULATOR(LDO16, max8997_ldo_ops),
 854         MAX8997_VOLTAGE_REGULATOR(LDO17, max8997_ldo_ops),
 855         MAX8997_VOLTAGE_REGULATOR(LDO18, max8997_ldo_ops),
 856         MAX8997_VOLTAGE_REGULATOR(LDO21, max8997_ldo_ops),
 857         MAX8997_VOLTAGE_REGULATOR(BUCK1, max8997_buck_ops),
 858         MAX8997_VOLTAGE_REGULATOR(BUCK2, max8997_buck_ops),
 859         MAX8997_VOLTAGE_REGULATOR(BUCK3, max8997_buck_ops),
 860         MAX8997_VOLTAGE_REGULATOR(BUCK4, max8997_buck_ops),
 861         MAX8997_VOLTAGE_REGULATOR(BUCK5, max8997_buck_ops),
 862         MAX8997_VOLTAGE_REGULATOR(BUCK6, max8997_fixedvolt_ops),
 863         MAX8997_VOLTAGE_REGULATOR(BUCK7, max8997_buck_ops),
 864         MAX8997_VOLTAGE_REGULATOR(EN32KHZ_AP, max8997_fixedvolt_ops),
 865         MAX8997_VOLTAGE_REGULATOR(EN32KHZ_CP, max8997_fixedvolt_ops),
 866         MAX8997_VOLTAGE_REGULATOR(ENVICHG, max8997_fixedvolt_ops),
 867         MAX8997_VOLTAGE_REGULATOR(ESAFEOUT1, max8997_safeout_ops),
 868         MAX8997_VOLTAGE_REGULATOR(ESAFEOUT2, max8997_safeout_ops),
 869         MAX8997_VOLTAGE_REGULATOR(CHARGER_CV, max8997_fixedstate_ops),
 870         MAX8997_CURRENT_REGULATOR(CHARGER, max8997_charger_ops),
 871         MAX8997_CURRENT_REGULATOR(CHARGER_TOPOFF,
 872                                   max8997_charger_fixedstate_ops),
 873 };
 874
 875 #ifdef CONFIG_OF
 876 static int max8997_pmic_dt_parse_dvs_gpio(struct platform_device *pdev,
 877                         struct max8997_platform_data *pdata,
 878                         struct device_node *pmic_np)
 879 {
 880         int i, gpio;
 881
 882         for (i = 0; i < 3; i++) {
 883                 gpio = of_get_named_gpio(pmic_np,
 884                                         "max8997,pmic-buck125-dvs-gpios", i);
 885                 if (!gpio_is_valid(gpio)) {
 886                         dev_err(&pdev->dev, "invalid gpio[%d]: %d\n", i, gpio);
 887                         return -EINVAL;
 888                 }
 889                 pdata->buck125_gpios[i] = gpio;
 890         }
 891         return 0;
 892 }
 893
 894 static int max8997_pmic_dt_parse_pdata(struct platform_device *pdev,
 895                                         struct max8997_platform_data *pdata)
 896 {
 897         struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 898         struct device_node *pmic_np, *regulators_np, *reg_np;
 899         struct max8997_regulator_data *rdata;
 900         unsigned int i, dvs_voltage_nr = 1, ret;
 901
 902         pmic_np = iodev->dev->of_node;
 903         if (!pmic_np) {
 904                 dev_err(&pdev->dev, "could not find pmic sub-node\n");
 905                 return -ENODEV;
 906         }
 907
 908         regulators_np = of_get_child_by_name(pmic_np, "regulators");
 909         if (!regulators_np) {
 910                 dev_err(&pdev->dev, "could not find regulators sub-node\n");
 911                 return -EINVAL;
 912         }
 913
 914         /* count the number of regulators to be supported in pmic */
 915         pdata->num_regulators = of_get_child_count(regulators_np);
 916
 917         rdata = devm_kcalloc(&pdev->dev,
 918                              pdata->num_regulators, sizeof(*rdata),
 919                              GFP_KERNEL);
 920         if (!rdata) {
 921                 of_node_put(regulators_np);
 922                 return -ENOMEM;
 923         }
 924
 925         pdata->regulators = rdata;
 926         for_each_child_of_node(regulators_np, reg_np) {
 927                 for (i = 0; i < ARRAY_SIZE(regulators); i++)
 928                         if (!of_node_cmp(reg_np->name, regulators[i].name))
 929                                 break;
 930
 931                 if (i == ARRAY_SIZE(regulators)) {
 932                         dev_warn(&pdev->dev, "don't know how to configure regulator %pOFn\n",
 933                                  reg_np);
 934                         continue;
 935                 }
 936
 937                 rdata->id = i;
 938                 rdata->initdata = of_get_regulator_init_data(&pdev->dev,
 939                                                              reg_np,
 940                                                              &regulators[i]);
 941                 rdata->reg_node = reg_np;
 942                 rdata++;
 943         }
 944         of_node_put(regulators_np);
 945
 946         if (of_get_property(pmic_np, "max8997,pmic-buck1-uses-gpio-dvs", NULL))
 947                 pdata->buck1_gpiodvs = true;
 948
 949         if (of_get_property(pmic_np, "max8997,pmic-buck2-uses-gpio-dvs", NULL))
 950                 pdata->buck2_gpiodvs = true;
 951
 952         if (of_get_property(pmic_np, "max8997,pmic-buck5-uses-gpio-dvs", NULL))
 953                 pdata->buck5_gpiodvs = true;
 954
 955         if (pdata->buck1_gpiodvs || pdata->buck2_gpiodvs ||
 956                                                 pdata->buck5_gpiodvs) {
 957                 ret = max8997_pmic_dt_parse_dvs_gpio(pdev, pdata, pmic_np);
 958                 if (ret)
 959                         return -EINVAL;
 960
 961                 if (of_property_read_u32(pmic_np,
 962                                 "max8997,pmic-buck125-default-dvs-idx",
 963                                 &pdata->buck125_default_idx)) {
 964                         pdata->buck125_default_idx = 0;
 965                 } else {
 966                         if (pdata->buck125_default_idx >= 8) {
 967                                 pdata->buck125_default_idx = 0;
 968                                 dev_info(&pdev->dev, "invalid value for default dvs index, using 0 instead\n");
 969                         }
 970                 }
 971
 972                 if (of_get_property(pmic_np,
 973                         "max8997,pmic-ignore-gpiodvs-side-effect", NULL))
 974                         pdata->ignore_gpiodvs_side_effect = true;
 975
 976                 dvs_voltage_nr = 8;
 977         }
 978
 979         if (of_property_read_u32_array(pmic_np,
 980                                 "max8997,pmic-buck1-dvs-voltage",
 981                                 pdata->buck1_voltage, dvs_voltage_nr)) {
 982                 dev_err(&pdev->dev, "buck1 voltages not specified\n");
 983                 return -EINVAL;
 984         }
 985
 986         if (of_property_read_u32_array(pmic_np,
 987                                 "max8997,pmic-buck2-dvs-voltage",
 988                                 pdata->buck2_voltage, dvs_voltage_nr)) {
 989                 dev_err(&pdev->dev, "buck2 voltages not specified\n");
 990                 return -EINVAL;
 991         }
 992
 993         if (of_property_read_u32_array(pmic_np,
 994                                 "max8997,pmic-buck5-dvs-voltage",
 995                                 pdata->buck5_voltage, dvs_voltage_nr)) {
 996                 dev_err(&pdev->dev, "buck5 voltages not specified\n");
 997                 return -EINVAL;
 998         }
 999
1000         return 0;
1001 }
1002 #else
1003 static int max8997_pmic_dt_parse_pdata(struct platform_device *pdev,
1004                                         struct max8997_platform_data *pdata)
1005 {
1006         return 0;
1007 }
1008 #endif /* CONFIG_OF */
1009
1010 static int max8997_pmic_probe(struct platform_device *pdev)
1011 {
1012         struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
1013         struct max8997_platform_data *pdata = iodev->pdata;
1014         struct regulator_config config = { };
1015         struct regulator_dev *rdev;
1016         struct max8997_data *max8997;
1017         struct i2c_client *i2c;
1018         int i, ret, nr_dvs;
1019         u8 max_buck1 = 0, max_buck2 = 0, max_buck5 = 0;
1020
1021         if (!pdata) {
1022                 dev_err(&pdev->dev, "No platform init data supplied.\n");
1023                 return -ENODEV;
1024         }
1025
1026         if (iodev->dev->of_node) {
1027                 ret = max8997_pmic_dt_parse_pdata(pdev, pdata);
1028                 if (ret)
1029                         return ret;
1030         }
1031
1032         max8997 = devm_kzalloc(&pdev->dev, sizeof(struct max8997_data),
1033                                GFP_KERNEL);
1034         if (!max8997)
1035                 return -ENOMEM;
1036
1037         max8997->dev = &pdev->dev;
1038         max8997->iodev = iodev;
1039         max8997->num_regulators = pdata->num_regulators;
1040         platform_set_drvdata(pdev, max8997);
1041         i2c = max8997->iodev->i2c;
1042
1043         max8997->buck125_gpioindex = pdata->buck125_default_idx;
1044         max8997->buck1_gpiodvs = pdata->buck1_gpiodvs;
1045         max8997->buck2_gpiodvs = pdata->buck2_gpiodvs;
1046         max8997->buck5_gpiodvs = pdata->buck5_gpiodvs;
1047         memcpy(max8997->buck125_gpios, pdata->buck125_gpios, sizeof(int) * 3);
1048         max8997->ignore_gpiodvs_side_effect = pdata->ignore_gpiodvs_side_effect;
1049
1050         nr_dvs = (pdata->buck1_gpiodvs || pdata->buck2_gpiodvs ||
1051                         pdata->buck5_gpiodvs) ? 8 : 1;
1052
1053         for (i = 0; i < nr_dvs; i++) {
1054                 max8997->buck1_vol[i] = ret =
1055                         max8997_get_voltage_proper_val(
1056                                         &buck1245_voltage_map_desc,
1057                                         pdata->buck1_voltage[i],
1058                                         pdata->buck1_voltage[i] +
1059                                         buck1245_voltage_map_desc.step);
1060                 if (ret < 0)
1061                         return ret;
1062
1063                 max8997->buck2_vol[i] = ret =
1064                         max8997_get_voltage_proper_val(
1065                                         &buck1245_voltage_map_desc,
1066                                         pdata->buck2_voltage[i],
1067                                         pdata->buck2_voltage[i] +
1068                                         buck1245_voltage_map_desc.step);
1069                 if (ret < 0)
1070                         return ret;
1071
1072                 max8997->buck5_vol[i] = ret =
1073                         max8997_get_voltage_proper_val(
1074                                         &buck1245_voltage_map_desc,
1075                                         pdata->buck5_voltage[i],
1076                                         pdata->buck5_voltage[i] +
1077                                         buck1245_voltage_map_desc.step);
1078                 if (ret < 0)
1079                         return ret;
1080
1081                 if (max_buck1 < max8997->buck1_vol[i])
1082                         max_buck1 = max8997->buck1_vol[i];
1083                 if (max_buck2 < max8997->buck2_vol[i])
1084                         max_buck2 = max8997->buck2_vol[i];
1085                 if (max_buck5 < max8997->buck5_vol[i])
1086                         max_buck5 = max8997->buck5_vol[i];
1087         }
1088
1089         /* For the safety, set max voltage before setting up */
1090         for (i = 0; i < 8; i++) {
1091                 max8997_update_reg(i2c, MAX8997_REG_BUCK1DVS1 + i,
1092                                 max_buck1, 0x3f);
1093                 max8997_update_reg(i2c, MAX8997_REG_BUCK2DVS1 + i,
1094                                 max_buck2, 0x3f);
1095                 max8997_update_reg(i2c, MAX8997_REG_BUCK5DVS1 + i,
1096                                 max_buck5, 0x3f);
1097         }
1098
1099         /* Initialize all the DVS related BUCK registers */
1100         for (i = 0; i < nr_dvs; i++) {
1101                 max8997_update_reg(i2c, MAX8997_REG_BUCK1DVS1 + i,
1102                                 max8997->buck1_vol[i],
1103                                 0x3f);
1104                 max8997_update_reg(i2c, MAX8997_REG_BUCK2DVS1 + i,
1105                                 max8997->buck2_vol[i],
1106                                 0x3f);
1107                 max8997_update_reg(i2c, MAX8997_REG_BUCK5DVS1 + i,
1108                                 max8997->buck5_vol[i],
1109                                 0x3f);
1110         }
1111
1112         /*
1113          * If buck 1, 2, and 5 do not care DVS GPIO settings, ignore them.
1114          * If at least one of them cares, set gpios.
1115          */
1116         if (pdata->buck1_gpiodvs || pdata->buck2_gpiodvs ||
1117                         pdata->buck5_gpiodvs) {
1118
1119                 if (!gpio_is_valid(pdata->buck125_gpios[0]) ||
1120                                 !gpio_is_valid(pdata->buck125_gpios[1]) ||
1121                                 !gpio_is_valid(pdata->buck125_gpios[2])) {
1122                         dev_err(&pdev->dev, "GPIO NOT VALID\n");
1123                         return -EINVAL;
1124                 }
1125
1126                 ret = devm_gpio_request(&pdev->dev, pdata->buck125_gpios[0],
1127                                         "MAX8997 SET1");
1128                 if (ret)
1129                         return ret;
1130
1131                 ret = devm_gpio_request(&pdev->dev, pdata->buck125_gpios[1],
1132                                         "MAX8997 SET2");
1133                 if (ret)
1134                         return ret;
1135
1136                 ret = devm_gpio_request(&pdev->dev, pdata->buck125_gpios[2],
1137                                 "MAX8997 SET3");
1138                 if (ret)
1139                         return ret;
1140
1141                 gpio_direction_output(pdata->buck125_gpios[0],
1142                                 (max8997->buck125_gpioindex >> 2)
1143                                 & 0x1); /* SET1 */
1144                 gpio_direction_output(pdata->buck125_gpios[1],
1145                                 (max8997->buck125_gpioindex >> 1)
1146                                 & 0x1); /* SET2 */
1147                 gpio_direction_output(pdata->buck125_gpios[2],
1148                                 (max8997->buck125_gpioindex >> 0)
1149                                 & 0x1); /* SET3 */
1150         }
1151
1152         /* DVS-GPIO disabled */
1153         max8997_update_reg(i2c, MAX8997_REG_BUCK1CTRL, (pdata->buck1_gpiodvs) ?
1154                         (1 << 1) : (0 << 1), 1 << 1);
1155         max8997_update_reg(i2c, MAX8997_REG_BUCK2CTRL, (pdata->buck2_gpiodvs) ?
1156                         (1 << 1) : (0 << 1), 1 << 1);
1157         max8997_update_reg(i2c, MAX8997_REG_BUCK5CTRL, (pdata->buck5_gpiodvs) ?
1158                         (1 << 1) : (0 << 1), 1 << 1);
1159
1160         /* Misc Settings */
1161         max8997->ramp_delay = 10; /* set 10mV/us, which is the default */
1162         max8997_write_reg(i2c, MAX8997_REG_BUCKRAMP, (0xf << 4) | 0x9);
1163
1164         for (i = 0; i < pdata->num_regulators; i++) {
1165                 const struct voltage_map_desc *desc;
1166                 int id = pdata->regulators[i].id;
1167
1168                 desc = reg_voltage_map[id];
1169                 if (desc) {
1170                         regulators[id].n_voltages =
1171                                 (desc->max - desc->min) / desc->step + 1;
1172                 } else if (id == MAX8997_ESAFEOUT1 || id == MAX8997_ESAFEOUT2) {
1173                         regulators[id].volt_table = safeoutvolt;
1174                         regulators[id].n_voltages = ARRAY_SIZE(safeoutvolt);
1175                 } else if (id == MAX8997_CHARGER_CV) {
1176                         regulators[id].n_voltages = 16;
1177                 }
1178
1179                 config.dev = max8997->dev;
1180                 config.init_data = pdata->regulators[i].initdata;
1181                 config.driver_data = max8997;
1182                 config.of_node = pdata->regulators[i].reg_node;
1183
1184                 rdev = devm_regulator_register(&pdev->dev, &regulators[id],
1185                                                &config);
1186                 if (IS_ERR(rdev)) {
1187                         dev_err(max8997->dev, "regulator init failed for %d\n",
1188                                         id);
1189                         return PTR_ERR(rdev);
1190                 }
1191         }
1192
1193         return 0;
1194 }
1195
1196 static const struct platform_device_id max8997_pmic_id[] = {
1197         { "max8997-pmic", 0},
1198         { },
1199 };
1200 MODULE_DEVICE_TABLE(platform, max8997_pmic_id);
1201
1202 static struct platform_driver max8997_pmic_driver = {
1203         .driver = {
1204                 .name = "max8997-pmic",
1205         },
1206         .probe = max8997_pmic_probe,
1207         .id_table = max8997_pmic_id,
1208 };
1209
1210 static int __init max8997_pmic_init(void)
1211 {
1212         return platform_driver_register(&max8997_pmic_driver);
1213 }
1214 subsys_initcall(max8997_pmic_init);
1215
1216 static void __exit max8997_pmic_cleanup(void)
1217 {
1218         platform_driver_unregister(&max8997_pmic_driver);
1219 }
1220 module_exit(max8997_pmic_cleanup);
1221
1222 MODULE_DESCRIPTION("MAXIM 8997/8966 Regulator Driver");
1223 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
1224 MODULE_LICENSE("GPL");