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 <[email protected]>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  *
  21  * This driver is based on max8998.c
  22  */
  23
  24 #include <linux/bug.h>
  25 #include <linux/err.h>
  26 #include <linux/gpio.h>
  27 #include <linux/of_gpio.h>
  28 #include <linux/slab.h>
  29 #include <linux/module.h>
  30 #include <linux/platform_device.h>
  31 #include <linux/regulator/driver.h>
  32 #include <linux/regulator/machine.h>
  33 #include <linux/mfd/max8997.h>
  34 #include <linux/mfd/max8997-private.h>
  35 #include <linux/regulator/of_regulator.h>
  36
  37 struct max8997_data {
  38         struct device *dev;
  39         struct max8997_dev *iodev;
  40         int num_regulators;
  41         int ramp_delay; /* in mV/us */
  42
  43         bool buck1_gpiodvs;
  44         bool buck2_gpiodvs;
  45         bool buck5_gpiodvs;
  46         u8 buck1_vol[8];
  47         u8 buck2_vol[8];
  48         u8 buck5_vol[8];
  49         int buck125_gpios[3];
  50         int buck125_gpioindex;
  51         bool ignore_gpiodvs_side_effect;
  52
  53         u8 saved_states[MAX8997_REG_MAX];
  54 };
  55
  56 static const unsigned int safeoutvolt[] = {
  57         4850000,
  58         4900000,
  59         4950000,
  60         3300000,
  61 };
  62
  63 static inline void max8997_set_gpio(struct max8997_data *max8997)
  64 {
  65         int set3 = (max8997->buck125_gpioindex) & 0x1;
  66         int set2 = ((max8997->buck125_gpioindex) >> 1) & 0x1;
  67         int set1 = ((max8997->buck125_gpioindex) >> 2) & 0x1;
  68
  69         gpio_set_value(max8997->buck125_gpios[0], set1);
  70         gpio_set_value(max8997->buck125_gpios[1], set2);
  71         gpio_set_value(max8997->buck125_gpios[2], set3);
  72 }
  73
  74 struct voltage_map_desc {
  75         int min;
  76         int max;
  77         int step;
  78 };
  79
  80 /* Voltage maps in uV */
  81 static const struct voltage_map_desc ldo_voltage_map_desc = {
  82         .min = 800000,  .max = 3950000, .step = 50000,
  83 }; /* LDO1 ~ 18, 21 all */
  84
  85 static const struct voltage_map_desc buck1245_voltage_map_desc = {
  86         .min = 650000,  .max = 2225000, .step = 25000,
  87 }; /* Buck1, 2, 4, 5 */
  88
  89 static const struct voltage_map_desc buck37_voltage_map_desc = {
  90         .min = 750000,  .max = 3900000, .step = 50000,
  91 }; /* Buck3, 7 */
  92
  93 /* current map in uA */
  94 static const struct voltage_map_desc charger_current_map_desc = {
  95         .min = 200000,  .max = 950000,  .step = 50000,
  96 };
  97
  98 static const struct voltage_map_desc topoff_current_map_desc = {
  99         .min = 50000,   .max = 200000,  .step = 10000,
 100 };
 101
 102 static const struct voltage_map_desc *reg_voltage_map[] = {
 103         [MAX8997_LDO1] = &ldo_voltage_map_desc,
 104         [MAX8997_LDO2] = &ldo_voltage_map_desc,
 105         [MAX8997_LDO3] = &ldo_voltage_map_desc,
 106         [MAX8997_LDO4] = &ldo_voltage_map_desc,
 107         [MAX8997_LDO5] = &ldo_voltage_map_desc,
 108         [MAX8997_LDO6] = &ldo_voltage_map_desc,
 109         [MAX8997_LDO7] = &ldo_voltage_map_desc,
 110         [MAX8997_LDO8] = &ldo_voltage_map_desc,
 111         [MAX8997_LDO9] = &ldo_voltage_map_desc,
 112         [MAX8997_LDO10] = &ldo_voltage_map_desc,
 113         [MAX8997_LDO11] = &ldo_voltage_map_desc,
 114         [MAX8997_LDO12] = &ldo_voltage_map_desc,
 115         [MAX8997_LDO13] = &ldo_voltage_map_desc,
 116         [MAX8997_LDO14] = &ldo_voltage_map_desc,
 117         [MAX8997_LDO15] = &ldo_voltage_map_desc,
 118         [MAX8997_LDO16] = &ldo_voltage_map_desc,
 119         [MAX8997_LDO17] = &ldo_voltage_map_desc,
 120         [MAX8997_LDO18] = &ldo_voltage_map_desc,
 121         [MAX8997_LDO21] = &ldo_voltage_map_desc,
 122         [MAX8997_BUCK1] = &buck1245_voltage_map_desc,
 123         [MAX8997_BUCK2] = &buck1245_voltage_map_desc,
 124         [MAX8997_BUCK3] = &buck37_voltage_map_desc,
 125         [MAX8997_BUCK4] = &buck1245_voltage_map_desc,
 126         [MAX8997_BUCK5] = &buck1245_voltage_map_desc,
 127         [MAX8997_BUCK6] = NULL,
 128         [MAX8997_BUCK7] = &buck37_voltage_map_desc,
 129         [MAX8997_EN32KHZ_AP] = NULL,
 130         [MAX8997_EN32KHZ_CP] = NULL,
 131         [MAX8997_ENVICHG] = NULL,
 132         [MAX8997_ESAFEOUT1] = NULL,
 133         [MAX8997_ESAFEOUT2] = NULL,
 134         [MAX8997_CHARGER_CV] = NULL,
 135         [MAX8997_CHARGER] = &charger_current_map_desc,
 136         [MAX8997_CHARGER_TOPOFF] = &topoff_current_map_desc,
 137 };
 138
 139 static int max8997_list_voltage_charger_cv(struct regulator_dev *rdev,
 140                 unsigned int selector)
 141 {
 142         int rid = rdev_get_id(rdev);
 143
 144         if (rid != MAX8997_CHARGER_CV)
 145                 goto err;
 146
 147         switch (selector) {
 148         case 0x00:
 149                 return 4200000;
 150         case 0x01 ... 0x0E:
 151                 return 4000000 + 20000 * (selector - 0x01);
 152         case 0x0F:
 153                 return 4350000;
 154         default:
 155                 return -EINVAL;
 156         }
 157 err:
 158         return -EINVAL;
 159 }
 160
 161 static int max8997_list_voltage(struct regulator_dev *rdev,
 162                 unsigned int selector)
 163 {
 164         const struct voltage_map_desc *desc;
 165         int rid = rdev_get_id(rdev);
 166         int val;
 167
 168         if (rid >= ARRAY_SIZE(reg_voltage_map) ||
 169                         rid < 0)
 170                 return -EINVAL;
 171
 172         desc = reg_voltage_map[rid];
 173         if (desc == NULL)
 174                 return -EINVAL;
 175
 176         val = desc->min + desc->step * selector;
 177         if (val > desc->max)
 178                 return -EINVAL;
 179
 180         return val;
 181 }
 182
 183 static int max8997_get_enable_register(struct regulator_dev *rdev,
 184                 int *reg, int *mask, int *pattern)
 185 {
 186         int rid = rdev_get_id(rdev);
 187
 188         switch (rid) {
 189         case MAX8997_LDO1 ... MAX8997_LDO21:
 190                 *reg = MAX8997_REG_LDO1CTRL + (rid - MAX8997_LDO1);
 191                 *mask = 0xC0;
 192                 *pattern = 0xC0;
 193                 break;
 194         case MAX8997_BUCK1:
 195                 *reg = MAX8997_REG_BUCK1CTRL;
 196                 *mask = 0x01;
 197                 *pattern = 0x01;
 198                 break;
 199         case MAX8997_BUCK2:
 200                 *reg = MAX8997_REG_BUCK2CTRL;
 201                 *mask = 0x01;
 202                 *pattern = 0x01;
 203                 break;
 204         case MAX8997_BUCK3:
 205                 *reg = MAX8997_REG_BUCK3CTRL;
 206                 *mask = 0x01;
 207                 *pattern = 0x01;
 208                 break;
 209         case MAX8997_BUCK4:
 210                 *reg = MAX8997_REG_BUCK4CTRL;
 211                 *mask = 0x01;
 212                 *pattern = 0x01;
 213                 break;
 214         case MAX8997_BUCK5:
 215                 *reg = MAX8997_REG_BUCK5CTRL;
 216                 *mask = 0x01;
 217                 *pattern = 0x01;
 218                 break;
 219         case MAX8997_BUCK6:
 220                 *reg = MAX8997_REG_BUCK6CTRL;
 221                 *mask = 0x01;
 222                 *pattern = 0x01;
 223                 break;
 224         case MAX8997_BUCK7:
 225                 *reg = MAX8997_REG_BUCK7CTRL;
 226                 *mask = 0x01;
 227                 *pattern = 0x01;
 228                 break;
 229         case MAX8997_EN32KHZ_AP ... MAX8997_EN32KHZ_CP:
 230                 *reg = MAX8997_REG_MAINCON1;
 231                 *mask = 0x01 << (rid - MAX8997_EN32KHZ_AP);
 232                 *pattern = 0x01 << (rid - MAX8997_EN32KHZ_AP);
 233                 break;
 234         case MAX8997_ENVICHG:
 235                 *reg = MAX8997_REG_MBCCTRL1;
 236                 *mask = 0x80;
 237                 *pattern = 0x80;
 238                 break;
 239         case MAX8997_ESAFEOUT1 ... MAX8997_ESAFEOUT2:
 240                 *reg = MAX8997_REG_SAFEOUTCTRL;
 241                 *mask = 0x40 << (rid - MAX8997_ESAFEOUT1);
 242                 *pattern = 0x40 << (rid - MAX8997_ESAFEOUT1);
 243                 break;
 244         case MAX8997_CHARGER:
 245                 *reg = MAX8997_REG_MBCCTRL2;
 246                 *mask = 0x40;
 247                 *pattern = 0x40;
 248                 break;
 249         default:
 250                 /* Not controllable or not exists */
 251                 return -EINVAL;
 252         }
 253
 254         return 0;
 255 }
 256
 257 static int max8997_reg_is_enabled(struct regulator_dev *rdev)
 258 {
 259         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 260         struct i2c_client *i2c = max8997->iodev->i2c;
 261         int ret, reg, mask, pattern;
 262         u8 val;
 263
 264         ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
 265         if (ret)
 266                 return ret;
 267
 268         ret = max8997_read_reg(i2c, reg, &val);
 269         if (ret)
 270                 return ret;
 271
 272         return (val & mask) == pattern;
 273 }
 274
 275 static int max8997_reg_enable(struct regulator_dev *rdev)
 276 {
 277         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 278         struct i2c_client *i2c = max8997->iodev->i2c;
 279         int ret, reg, mask, pattern;
 280
 281         ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
 282         if (ret)
 283                 return ret;
 284
 285         return max8997_update_reg(i2c, reg, pattern, mask);
 286 }
 287
 288 static int max8997_reg_disable(struct regulator_dev *rdev)
 289 {
 290         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 291         struct i2c_client *i2c = max8997->iodev->i2c;
 292         int ret, reg, mask, pattern;
 293
 294         ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
 295         if (ret)
 296                 return ret;
 297
 298         return max8997_update_reg(i2c, reg, ~pattern, mask);
 299 }
 300
 301 static int max8997_get_voltage_register(struct regulator_dev *rdev,
 302                 int *_reg, int *_shift, int *_mask)
 303 {
 304         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 305         int rid = rdev_get_id(rdev);
 306         int reg, shift = 0, mask = 0x3f;
 307
 308         switch (rid) {
 309         case MAX8997_LDO1 ... MAX8997_LDO21:
 310                 reg = MAX8997_REG_LDO1CTRL + (rid - MAX8997_LDO1);
 311                 break;
 312         case MAX8997_BUCK1:
 313                 reg = MAX8997_REG_BUCK1DVS1;
 314                 if (max8997->buck1_gpiodvs)
 315                         reg += max8997->buck125_gpioindex;
 316                 break;
 317         case MAX8997_BUCK2:
 318                 reg = MAX8997_REG_BUCK2DVS1;
 319                 if (max8997->buck2_gpiodvs)
 320                         reg += max8997->buck125_gpioindex;
 321                 break;
 322         case MAX8997_BUCK3:
 323                 reg = MAX8997_REG_BUCK3DVS;
 324                 break;
 325         case MAX8997_BUCK4:
 326                 reg = MAX8997_REG_BUCK4DVS;
 327                 break;
 328         case MAX8997_BUCK5:
 329                 reg = MAX8997_REG_BUCK5DVS1;
 330                 if (max8997->buck5_gpiodvs)
 331                         reg += max8997->buck125_gpioindex;
 332                 break;
 333         case MAX8997_BUCK7:
 334                 reg = MAX8997_REG_BUCK7DVS;
 335                 break;
 336         case MAX8997_ESAFEOUT1 ...  MAX8997_ESAFEOUT2:
 337                 reg = MAX8997_REG_SAFEOUTCTRL;
 338                 shift = (rid == MAX8997_ESAFEOUT2) ? 2 : 0;
 339                 mask = 0x3;
 340                 break;
 341         case MAX8997_CHARGER_CV:
 342                 reg = MAX8997_REG_MBCCTRL3;
 343                 shift = 0;
 344                 mask = 0xf;
 345                 break;
 346         case MAX8997_CHARGER:
 347                 reg = MAX8997_REG_MBCCTRL4;
 348                 shift = 0;
 349                 mask = 0xf;
 350                 break;
 351         case MAX8997_CHARGER_TOPOFF:
 352                 reg = MAX8997_REG_MBCCTRL5;
 353                 shift = 0;
 354                 mask = 0xf;
 355                 break;
 356         default:
 357                 return -EINVAL;
 358         }
 359
 360         *_reg = reg;
 361         *_shift = shift;
 362         *_mask = mask;
 363
 364         return 0;
 365 }
 366
 367 static int max8997_get_voltage_sel(struct regulator_dev *rdev)
 368 {
 369         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 370         struct i2c_client *i2c = max8997->iodev->i2c;
 371         int reg, shift, mask, ret;
 372         u8 val;
 373
 374         ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
 375         if (ret)
 376                 return ret;
 377
 378         ret = max8997_read_reg(i2c, reg, &val);
 379         if (ret)
 380                 return ret;
 381
 382         val >>= shift;
 383         val &= mask;
 384
 385         return val;
 386 }
 387
 388 static inline int max8997_get_voltage_proper_val(
 389                 const struct voltage_map_desc *desc,
 390                 int min_vol, int max_vol)
 391 {
 392         int i;
 393
 394         if (desc == NULL)
 395                 return -EINVAL;
 396
 397         if (max_vol < desc->min || min_vol > desc->max)
 398                 return -EINVAL;
 399
 400         if (min_vol < desc->min)
 401                 min_vol = desc->min;
 402
 403         i = DIV_ROUND_UP(min_vol - desc->min, desc->step);
 404
 405         if (desc->min + desc->step * i > max_vol)
 406                 return -EINVAL;
 407
 408         return i;
 409 }
 410
 411 static int max8997_set_voltage_charger_cv(struct regulator_dev *rdev,
 412                 int min_uV, int max_uV, unsigned *selector)
 413 {
 414         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 415         struct i2c_client *i2c = max8997->iodev->i2c;
 416         int rid = rdev_get_id(rdev);
 417         int lb, ub;
 418         int reg, shift = 0, mask, ret = 0;
 419         u8 val = 0x0;
 420
 421         if (rid != MAX8997_CHARGER_CV)
 422                 return -EINVAL;
 423
 424         ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
 425         if (ret)
 426                 return ret;
 427
 428         if (max_uV < 4000000 || min_uV > 4350000)
 429                 return -EINVAL;
 430
 431         if (min_uV <= 4000000)
 432                 val = 0x1;
 433         else if (min_uV <= 4200000 && max_uV >= 4200000)
 434                 val = 0x0;
 435         else {
 436                 lb = (min_uV - 4000001) / 20000 + 2;
 437                 ub = (max_uV - 4000000) / 20000 + 1;
 438
 439                 if (lb > ub)
 440                         return -EINVAL;
 441
 442                 if (lb < 0xf)
 443                         val = lb;
 444                 else {
 445                         if (ub >= 0xf)
 446                                 val = 0xf;
 447                         else
 448                                 return -EINVAL;
 449                 }
 450         }
 451
 452         *selector = val;
 453
 454         ret = max8997_update_reg(i2c, reg, val << shift, mask);
 455
 456         return ret;
 457 }
 458
 459 /*
 460  * For LDO1 ~ LDO21, BUCK1~5, BUCK7, CHARGER, CHARGER_TOPOFF
 461  * BUCK1, 2, and 5 are available if they are not controlled by gpio
 462  */
 463 static int max8997_set_voltage_ldobuck(struct regulator_dev *rdev,
 464                 int min_uV, int max_uV, unsigned *selector)
 465 {
 466         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 467         struct i2c_client *i2c = max8997->iodev->i2c;
 468         const struct voltage_map_desc *desc;
 469         int rid = rdev_get_id(rdev);
 470         int i, reg, shift, mask, ret;
 471
 472         switch (rid) {
 473         case MAX8997_LDO1 ... MAX8997_LDO21:
 474                 break;
 475         case MAX8997_BUCK1 ... MAX8997_BUCK5:
 476                 break;
 477         case MAX8997_BUCK6:
 478                 return -EINVAL;
 479         case MAX8997_BUCK7:
 480                 break;
 481         case MAX8997_CHARGER:
 482                 break;
 483         case MAX8997_CHARGER_TOPOFF:
 484                 break;
 485         default:
 486                 return -EINVAL;
 487         }
 488
 489         desc = reg_voltage_map[rid];
 490
 491         i = max8997_get_voltage_proper_val(desc, min_uV, max_uV);
 492         if (i < 0)
 493                 return i;
 494
 495         ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
 496         if (ret)
 497                 return ret;
 498
 499         ret = max8997_update_reg(i2c, reg, i << shift, mask << shift);
 500         *selector = i;
 501
 502         return ret;
 503 }
 504
 505 static int max8997_set_voltage_buck_time_sel(struct regulator_dev *rdev,
 506                                                 unsigned int old_selector,
 507                                                 unsigned int new_selector)
 508 {
 509         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 510         int rid = rdev_get_id(rdev);
 511         const struct voltage_map_desc *desc = reg_voltage_map[rid];
 512
 513         /* Delay is required only if the voltage is increasing */
 514         if (old_selector >= new_selector)
 515                 return 0;
 516
 517         /* No need to delay if gpio_dvs_mode */
 518         switch (rid) {
 519         case MAX8997_BUCK1:
 520                 if (max8997->buck1_gpiodvs)
 521                         return 0;
 522                 break;
 523         case MAX8997_BUCK2:
 524                 if (max8997->buck2_gpiodvs)
 525                         return 0;
 526                 break;
 527         case MAX8997_BUCK5:
 528                 if (max8997->buck5_gpiodvs)
 529                         return 0;
 530                 break;
 531         }
 532
 533         switch (rid) {
 534         case MAX8997_BUCK1:
 535         case MAX8997_BUCK2:
 536         case MAX8997_BUCK4:
 537         case MAX8997_BUCK5:
 538                 return DIV_ROUND_UP(desc->step * (new_selector - old_selector),
 539                                     max8997->ramp_delay * 1000);
 540         }
 541
 542         return 0;
 543 }
 544
 545 /*
 546  * Assess the damage on the voltage setting of BUCK1,2,5 by the change.
 547  *
 548  * When GPIO-DVS mode is used for multiple bucks, changing the voltage value
 549  * of one of the bucks may affect that of another buck, which is the side
 550  * effect of the change (set_voltage). This function examines the GPIO-DVS
 551  * configurations and checks whether such side-effect exists.
 552  */
 553 static int max8997_assess_side_effect(struct regulator_dev *rdev,
 554                 u8 new_val, int *best)
 555 {
 556         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 557         int rid = rdev_get_id(rdev);
 558         u8 *buckx_val[3];
 559         bool buckx_gpiodvs[3];
 560         int side_effect[8];
 561         int min_side_effect = INT_MAX;
 562         int i;
 563
 564         *best = -1;
 565
 566         switch (rid) {
 567         case MAX8997_BUCK1:
 568                 rid = 0;
 569                 break;
 570         case MAX8997_BUCK2:
 571                 rid = 1;
 572                 break;
 573         case MAX8997_BUCK5:
 574                 rid = 2;
 575                 break;
 576         default:
 577                 return -EINVAL;
 578         }
 579
 580         buckx_val[0] = max8997->buck1_vol;
 581         buckx_val[1] = max8997->buck2_vol;
 582         buckx_val[2] = max8997->buck5_vol;
 583         buckx_gpiodvs[0] = max8997->buck1_gpiodvs;
 584         buckx_gpiodvs[1] = max8997->buck2_gpiodvs;
 585         buckx_gpiodvs[2] = max8997->buck5_gpiodvs;
 586
 587         for (i = 0; i < 8; i++) {
 588                 int others;
 589
 590                 if (new_val != (buckx_val[rid])[i]) {
 591                         side_effect[i] = -1;
 592                         continue;
 593                 }
 594
 595                 side_effect[i] = 0;
 596                 for (others = 0; others < 3; others++) {
 597                         int diff;
 598
 599                         if (others == rid)
 600                                 continue;
 601                         if (buckx_gpiodvs[others] == false)
 602                                 continue; /* Not affected */
 603                         diff = (buckx_val[others])[i] -
 604                                 (buckx_val[others])[max8997->buck125_gpioindex];
 605                         if (diff > 0)
 606                                 side_effect[i] += diff;
 607                         else if (diff < 0)
 608                                 side_effect[i] -= diff;
 609                 }
 610                 if (side_effect[i] == 0) {
 611                         *best = i;
 612                         return 0; /* NO SIDE EFFECT! Use This! */
 613                 }
 614                 if (side_effect[i] < min_side_effect) {
 615                         min_side_effect = side_effect[i];
 616                         *best = i;
 617                 }
 618         }
 619
 620         if (*best == -1)
 621                 return -EINVAL;
 622
 623         return side_effect[*best];
 624 }
 625
 626 /*
 627  * For Buck 1 ~ 5 and 7. If it is not controlled by GPIO, this calls
 628  * max8997_set_voltage_ldobuck to do the job.
 629  */
 630 static int max8997_set_voltage_buck(struct regulator_dev *rdev,
 631                 int min_uV, int max_uV, unsigned *selector)
 632 {
 633         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 634         int rid = rdev_get_id(rdev);
 635         const struct voltage_map_desc *desc;
 636         int new_val, new_idx, damage, tmp_val, tmp_idx, tmp_dmg;
 637         bool gpio_dvs_mode = false;
 638
 639         if (rid < MAX8997_BUCK1 || rid > MAX8997_BUCK7)
 640                 return -EINVAL;
 641
 642         switch (rid) {
 643         case MAX8997_BUCK1:
 644                 if (max8997->buck1_gpiodvs)
 645                         gpio_dvs_mode = true;
 646                 break;
 647         case MAX8997_BUCK2:
 648                 if (max8997->buck2_gpiodvs)
 649                         gpio_dvs_mode = true;
 650                 break;
 651         case MAX8997_BUCK5:
 652                 if (max8997->buck5_gpiodvs)
 653                         gpio_dvs_mode = true;
 654                 break;
 655         }
 656
 657         if (!gpio_dvs_mode)
 658                 return max8997_set_voltage_ldobuck(rdev, min_uV, max_uV,
 659                                                 selector);
 660
 661         desc = reg_voltage_map[rid];
 662         new_val = max8997_get_voltage_proper_val(desc, min_uV, max_uV);
 663         if (new_val < 0)
 664                 return new_val;
 665
 666         tmp_dmg = INT_MAX;
 667         tmp_idx = -1;
 668         tmp_val = -1;
 669         do {
 670                 damage = max8997_assess_side_effect(rdev, new_val, &new_idx);
 671                 if (damage == 0)
 672                         goto out;
 673
 674                 if (tmp_dmg > damage) {
 675                         tmp_idx = new_idx;
 676                         tmp_val = new_val;
 677                         tmp_dmg = damage;
 678                 }
 679
 680                 new_val++;
 681         } while (desc->min + desc->step * new_val <= desc->max);
 682
 683         new_idx = tmp_idx;
 684         new_val = tmp_val;
 685
 686         if (max8997->ignore_gpiodvs_side_effect == false)
 687                 return -EINVAL;
 688
 689         dev_warn(&rdev->dev,
 690                 "MAX8997 GPIO-DVS Side Effect Warning: GPIO SET:  %d -> %d\n",
 691                 max8997->buck125_gpioindex, tmp_idx);
 692
 693 out:
 694         if (new_idx < 0 || new_val < 0)
 695                 return -EINVAL;
 696
 697         max8997->buck125_gpioindex = new_idx;
 698         max8997_set_gpio(max8997);
 699         *selector = new_val;
 700
 701         return 0;
 702 }
 703
 704 /* For SAFEOUT1 and SAFEOUT2 */
 705 static int max8997_set_voltage_safeout_sel(struct regulator_dev *rdev,
 706                                            unsigned selector)
 707 {
 708         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 709         struct i2c_client *i2c = max8997->iodev->i2c;
 710         int rid = rdev_get_id(rdev);
 711         int reg, shift = 0, mask, ret;
 712
 713         if (rid != MAX8997_ESAFEOUT1 && rid != MAX8997_ESAFEOUT2)
 714                 return -EINVAL;
 715
 716         ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
 717         if (ret)
 718                 return ret;
 719
 720         return max8997_update_reg(i2c, reg, selector << shift, mask << shift);
 721 }
 722
 723 static int max8997_reg_disable_suspend(struct regulator_dev *rdev)
 724 {
 725         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 726         struct i2c_client *i2c = max8997->iodev->i2c;
 727         int ret, reg, mask, pattern;
 728         int rid = rdev_get_id(rdev);
 729
 730         ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
 731         if (ret)
 732                 return ret;
 733
 734         max8997_read_reg(i2c, reg, &max8997->saved_states[rid]);
 735
 736         if (rid == MAX8997_LDO1 ||
 737                         rid == MAX8997_LDO10 ||
 738                         rid == MAX8997_LDO21) {
 739                 dev_dbg(&rdev->dev, "Conditional Power-Off for %s\n",
 740                                 rdev->desc->name);
 741                 return max8997_update_reg(i2c, reg, 0x40, mask);
 742         }
 743
 744         dev_dbg(&rdev->dev, "Full Power-Off for %s (%xh -> %xh)\n",
 745                         rdev->desc->name, max8997->saved_states[rid] & mask,
 746                         (~pattern) & mask);
 747         return max8997_update_reg(i2c, reg, ~pattern, mask);
 748 }
 749
 750 static struct regulator_ops max8997_ldo_ops = {
 751         .list_voltage           = max8997_list_voltage,
 752         .is_enabled             = max8997_reg_is_enabled,
 753         .enable                 = max8997_reg_enable,
 754         .disable                = max8997_reg_disable,
 755         .get_voltage_sel        = max8997_get_voltage_sel,
 756         .set_voltage            = max8997_set_voltage_ldobuck,
 757         .set_suspend_disable    = max8997_reg_disable_suspend,
 758 };
 759
 760 static struct regulator_ops max8997_buck_ops = {
 761         .list_voltage           = max8997_list_voltage,
 762         .is_enabled             = max8997_reg_is_enabled,
 763         .enable                 = max8997_reg_enable,
 764         .disable                = max8997_reg_disable,
 765         .get_voltage_sel        = max8997_get_voltage_sel,
 766         .set_voltage            = max8997_set_voltage_buck,
 767         .set_voltage_time_sel   = max8997_set_voltage_buck_time_sel,
 768         .set_suspend_disable    = max8997_reg_disable_suspend,
 769 };
 770
 771 static struct regulator_ops max8997_fixedvolt_ops = {
 772         .list_voltage           = max8997_list_voltage,
 773         .is_enabled             = max8997_reg_is_enabled,
 774         .enable                 = max8997_reg_enable,
 775         .disable                = max8997_reg_disable,
 776         .set_suspend_disable    = max8997_reg_disable_suspend,
 777 };
 778
 779 static struct regulator_ops max8997_safeout_ops = {
 780         .list_voltage           = regulator_list_voltage_table,
 781         .is_enabled             = max8997_reg_is_enabled,
 782         .enable                 = max8997_reg_enable,
 783         .disable                = max8997_reg_disable,
 784         .get_voltage_sel        = max8997_get_voltage_sel,
 785         .set_voltage_sel        = max8997_set_voltage_safeout_sel,
 786         .set_suspend_disable    = max8997_reg_disable_suspend,
 787 };
 788
 789 static struct regulator_ops max8997_fixedstate_ops = {
 790         .list_voltage           = max8997_list_voltage_charger_cv,
 791         .get_voltage_sel        = max8997_get_voltage_sel,
 792         .set_voltage            = max8997_set_voltage_charger_cv,
 793 };
 794
 795 static int max8997_set_current_limit(struct regulator_dev *rdev,
 796                                      int min_uA, int max_uA)
 797 {
 798         unsigned dummy;
 799         int rid = rdev_get_id(rdev);
 800
 801         if (rid != MAX8997_CHARGER && rid != MAX8997_CHARGER_TOPOFF)
 802                 return -EINVAL;
 803
 804         /* Reuse max8997_set_voltage_ldobuck to set current_limit. */
 805         return max8997_set_voltage_ldobuck(rdev, min_uA, max_uA, &dummy);
 806 }
 807
 808 static int max8997_get_current_limit(struct regulator_dev *rdev)
 809 {
 810         int sel, rid = rdev_get_id(rdev);
 811
 812         if (rid != MAX8997_CHARGER && rid != MAX8997_CHARGER_TOPOFF)
 813                 return -EINVAL;
 814
 815         sel = max8997_get_voltage_sel(rdev);
 816         if (sel < 0)
 817                 return sel;
 818
 819         /* Reuse max8997_list_voltage to get current_limit. */
 820         return max8997_list_voltage(rdev, sel);
 821 }
 822
 823 static struct regulator_ops max8997_charger_ops = {
 824         .is_enabled             = max8997_reg_is_enabled,
 825         .enable                 = max8997_reg_enable,
 826         .disable                = max8997_reg_disable,
 827         .get_current_limit      = max8997_get_current_limit,
 828         .set_current_limit      = max8997_set_current_limit,
 829 };
 830
 831 static struct regulator_ops max8997_charger_fixedstate_ops = {
 832         .get_current_limit      = max8997_get_current_limit,
 833         .set_current_limit      = max8997_set_current_limit,
 834 };
 835
 836 #define MAX8997_VOLTAGE_REGULATOR(_name, _ops) {\
 837         .name           = #_name,               \
 838         .id             = MAX8997_##_name,      \
 839         .ops            = &_ops,                \
 840         .type           = REGULATOR_VOLTAGE,    \
 841         .owner          = THIS_MODULE,          \
 842 }
 843
 844 #define MAX8997_CURRENT_REGULATOR(_name, _ops) {\
 845         .name           = #_name,               \
 846         .id             = MAX8997_##_name,      \
 847         .ops            = &_ops,                \
 848         .type           = REGULATOR_CURRENT,    \
 849         .owner          = THIS_MODULE,          \
 850 }
 851
 852 static struct regulator_desc regulators[] = {
 853         MAX8997_VOLTAGE_REGULATOR(LDO1, max8997_ldo_ops),
 854         MAX8997_VOLTAGE_REGULATOR(LDO2, max8997_ldo_ops),
 855         MAX8997_VOLTAGE_REGULATOR(LDO3, max8997_ldo_ops),
 856         MAX8997_VOLTAGE_REGULATOR(LDO4, max8997_ldo_ops),
 857         MAX8997_VOLTAGE_REGULATOR(LDO5, max8997_ldo_ops),
 858         MAX8997_VOLTAGE_REGULATOR(LDO6, max8997_ldo_ops),
 859         MAX8997_VOLTAGE_REGULATOR(LDO7, max8997_ldo_ops),
 860         MAX8997_VOLTAGE_REGULATOR(LDO8, max8997_ldo_ops),
 861         MAX8997_VOLTAGE_REGULATOR(LDO9, max8997_ldo_ops),
 862         MAX8997_VOLTAGE_REGULATOR(LDO10, max8997_ldo_ops),
 863         MAX8997_VOLTAGE_REGULATOR(LDO11, max8997_ldo_ops),
 864         MAX8997_VOLTAGE_REGULATOR(LDO12, max8997_ldo_ops),
 865         MAX8997_VOLTAGE_REGULATOR(LDO13, max8997_ldo_ops),
 866         MAX8997_VOLTAGE_REGULATOR(LDO14, max8997_ldo_ops),
 867         MAX8997_VOLTAGE_REGULATOR(LDO15, max8997_ldo_ops),
 868         MAX8997_VOLTAGE_REGULATOR(LDO16, max8997_ldo_ops),
 869         MAX8997_VOLTAGE_REGULATOR(LDO17, max8997_ldo_ops),
 870         MAX8997_VOLTAGE_REGULATOR(LDO18, max8997_ldo_ops),
 871         MAX8997_VOLTAGE_REGULATOR(LDO21, max8997_ldo_ops),
 872         MAX8997_VOLTAGE_REGULATOR(BUCK1, max8997_buck_ops),
 873         MAX8997_VOLTAGE_REGULATOR(BUCK2, max8997_buck_ops),
 874         MAX8997_VOLTAGE_REGULATOR(BUCK3, max8997_buck_ops),
 875         MAX8997_VOLTAGE_REGULATOR(BUCK4, max8997_buck_ops),
 876         MAX8997_VOLTAGE_REGULATOR(BUCK5, max8997_buck_ops),
 877         MAX8997_VOLTAGE_REGULATOR(BUCK6, max8997_fixedvolt_ops),
 878         MAX8997_VOLTAGE_REGULATOR(BUCK7, max8997_buck_ops),
 879         MAX8997_VOLTAGE_REGULATOR(EN32KHZ_AP, max8997_fixedvolt_ops),
 880         MAX8997_VOLTAGE_REGULATOR(EN32KHZ_CP, max8997_fixedvolt_ops),
 881         MAX8997_VOLTAGE_REGULATOR(ENVICHG, max8997_fixedvolt_ops),
 882         MAX8997_VOLTAGE_REGULATOR(ESAFEOUT1, max8997_safeout_ops),
 883         MAX8997_VOLTAGE_REGULATOR(ESAFEOUT2, max8997_safeout_ops),
 884         MAX8997_VOLTAGE_REGULATOR(CHARGER_CV, max8997_fixedstate_ops),
 885         MAX8997_CURRENT_REGULATOR(CHARGER, max8997_charger_ops),
 886         MAX8997_CURRENT_REGULATOR(CHARGER_TOPOFF,
 887                                   max8997_charger_fixedstate_ops),
 888 };
 889
 890 #ifdef CONFIG_OF
 891 static int max8997_pmic_dt_parse_dvs_gpio(struct platform_device *pdev,
 892                         struct max8997_platform_data *pdata,
 893                         struct device_node *pmic_np)
 894 {
 895         int i, gpio;
 896
 897         for (i = 0; i < 3; i++) {
 898                 gpio = of_get_named_gpio(pmic_np,
 899                                         "max8997,pmic-buck125-dvs-gpios", i);
 900                 if (!gpio_is_valid(gpio)) {
 901                         dev_err(&pdev->dev, "invalid gpio[%d]: %d\n", i, gpio);
 902                         return -EINVAL;
 903                 }
 904                 pdata->buck125_gpios[i] = gpio;
 905         }
 906         return 0;
 907 }
 908
 909 static int max8997_pmic_dt_parse_pdata(struct platform_device *pdev,
 910                                         struct max8997_platform_data *pdata)
 911 {
 912         struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 913         struct device_node *pmic_np, *regulators_np, *reg_np;
 914         struct max8997_regulator_data *rdata;
 915         unsigned int i, dvs_voltage_nr = 1, ret;
 916
 917         pmic_np = iodev->dev->of_node;
 918         if (!pmic_np) {
 919                 dev_err(&pdev->dev, "could not find pmic sub-node\n");
 920                 return -ENODEV;
 921         }
 922
 923         regulators_np = of_get_child_by_name(pmic_np, "regulators");
 924         if (!regulators_np) {
 925                 dev_err(&pdev->dev, "could not find regulators sub-node\n");
 926                 return -EINVAL;
 927         }
 928
 929         /* count the number of regulators to be supported in pmic */
 930         pdata->num_regulators = of_get_child_count(regulators_np);
 931
 932         rdata = devm_kzalloc(&pdev->dev, sizeof(*rdata) *
 933                                 pdata->num_regulators, 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 <[email protected]>");
1238 MODULE_LICENSE("GPL");