drivers/regulator/max8997.c

   1 /*
   2  * max8997.c - Regulator driver for the Maxim 8997/8966
   3  *
   4  * Copyright (C) 2011 Samsung Electronics
   5  * MyungJoo Ham <[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         struct regulator_dev **rdev;
  42         int ramp_delay; /* in mV/us */
  43
  44         bool buck1_gpiodvs;
  45         bool buck2_gpiodvs;
  46         bool buck5_gpiodvs;
  47         u8 buck1_vol[8];
  48         u8 buck2_vol[8];
  49         u8 buck5_vol[8];
  50         int buck125_gpios[3];
  51         int buck125_gpioindex;
  52         bool ignore_gpiodvs_side_effect;
  53
  54         u8 saved_states[MAX8997_REG_MAX];
  55 };
  56
  57 static const unsigned int safeoutvolt[] = {
  58         4850000,
  59         4900000,
  60         4950000,
  61         3300000,
  62 };
  63
  64 static inline void max8997_set_gpio(struct max8997_data *max8997)
  65 {
  66         int set3 = (max8997->buck125_gpioindex) & 0x1;
  67         int set2 = ((max8997->buck125_gpioindex) >> 1) & 0x1;
  68         int set1 = ((max8997->buck125_gpioindex) >> 2) & 0x1;
  69
  70         gpio_set_value(max8997->buck125_gpios[0], set1);
  71         gpio_set_value(max8997->buck125_gpios[1], set2);
  72         gpio_set_value(max8997->buck125_gpios[2], set3);
  73 }
  74
  75 struct voltage_map_desc {
  76         int min;
  77         int max;
  78         int step;
  79 };
  80
  81 /* Voltage maps in uV */
  82 static const struct voltage_map_desc ldo_voltage_map_desc = {
  83         .min = 800000,  .max = 3950000, .step = 50000,
  84 }; /* LDO1 ~ 18, 21 all */
  85
  86 static const struct voltage_map_desc buck1245_voltage_map_desc = {
  87         .min = 650000,  .max = 2225000, .step = 25000,
  88 }; /* Buck1, 2, 4, 5 */
  89
  90 static const struct voltage_map_desc buck37_voltage_map_desc = {
  91         .min = 750000,  .max = 3900000, .step = 50000,
  92 }; /* Buck3, 7 */
  93
  94 /* current map in uA */
  95 static const struct voltage_map_desc charger_current_map_desc = {
  96         .min = 200000,  .max = 950000,  .step = 50000,
  97 };
  98
  99 static const struct voltage_map_desc topoff_current_map_desc = {
 100         .min = 50000,   .max = 200000,  .step = 10000,
 101 };
 102
 103 static const struct voltage_map_desc *reg_voltage_map[] = {
 104         [MAX8997_LDO1] = &ldo_voltage_map_desc,
 105         [MAX8997_LDO2] = &ldo_voltage_map_desc,
 106         [MAX8997_LDO3] = &ldo_voltage_map_desc,
 107         [MAX8997_LDO4] = &ldo_voltage_map_desc,
 108         [MAX8997_LDO5] = &ldo_voltage_map_desc,
 109         [MAX8997_LDO6] = &ldo_voltage_map_desc,
 110         [MAX8997_LDO7] = &ldo_voltage_map_desc,
 111         [MAX8997_LDO8] = &ldo_voltage_map_desc,
 112         [MAX8997_LDO9] = &ldo_voltage_map_desc,
 113         [MAX8997_LDO10] = &ldo_voltage_map_desc,
 114         [MAX8997_LDO11] = &ldo_voltage_map_desc,
 115         [MAX8997_LDO12] = &ldo_voltage_map_desc,
 116         [MAX8997_LDO13] = &ldo_voltage_map_desc,
 117         [MAX8997_LDO14] = &ldo_voltage_map_desc,
 118         [MAX8997_LDO15] = &ldo_voltage_map_desc,
 119         [MAX8997_LDO16] = &ldo_voltage_map_desc,
 120         [MAX8997_LDO17] = &ldo_voltage_map_desc,
 121         [MAX8997_LDO18] = &ldo_voltage_map_desc,
 122         [MAX8997_LDO21] = &ldo_voltage_map_desc,
 123         [MAX8997_BUCK1] = &buck1245_voltage_map_desc,
 124         [MAX8997_BUCK2] = &buck1245_voltage_map_desc,
 125         [MAX8997_BUCK3] = &buck37_voltage_map_desc,
 126         [MAX8997_BUCK4] = &buck1245_voltage_map_desc,
 127         [MAX8997_BUCK5] = &buck1245_voltage_map_desc,
 128         [MAX8997_BUCK6] = NULL,
 129         [MAX8997_BUCK7] = &buck37_voltage_map_desc,
 130         [MAX8997_EN32KHZ_AP] = NULL,
 131         [MAX8997_EN32KHZ_CP] = NULL,
 132         [MAX8997_ENVICHG] = NULL,
 133         [MAX8997_ESAFEOUT1] = NULL,
 134         [MAX8997_ESAFEOUT2] = NULL,
 135         [MAX8997_CHARGER_CV] = NULL,
 136         [MAX8997_CHARGER] = &charger_current_map_desc,
 137         [MAX8997_CHARGER_TOPOFF] = &topoff_current_map_desc,
 138 };
 139
 140 static int max8997_list_voltage_charger_cv(struct regulator_dev *rdev,
 141                 unsigned int selector)
 142 {
 143         int rid = rdev_get_id(rdev);
 144
 145         if (rid != MAX8997_CHARGER_CV)
 146                 goto err;
 147
 148         switch (selector) {
 149         case 0x00:
 150                 return 4200000;
 151         case 0x01 ... 0x0E:
 152                 return 4000000 + 20000 * (selector - 0x01);
 153         case 0x0F:
 154                 return 4350000;
 155         default:
 156                 return -EINVAL;
 157         }
 158 err:
 159         return -EINVAL;
 160 }
 161
 162 static int max8997_list_voltage(struct regulator_dev *rdev,
 163                 unsigned int selector)
 164 {
 165         const struct voltage_map_desc *desc;
 166         int rid = rdev_get_id(rdev);
 167         int val;
 168
 169         if (rid >= ARRAY_SIZE(reg_voltage_map) ||
 170                         rid < 0)
 171                 return -EINVAL;
 172
 173         desc = reg_voltage_map[rid];
 174         if (desc == NULL)
 175                 return -EINVAL;
 176
 177         val = desc->min + desc->step * selector;
 178         if (val > desc->max)
 179                 return -EINVAL;
 180
 181         return val;
 182 }
 183
 184 static int max8997_get_enable_register(struct regulator_dev *rdev,
 185                 int *reg, int *mask, int *pattern)
 186 {
 187         int rid = rdev_get_id(rdev);
 188
 189         switch (rid) {
 190         case MAX8997_LDO1 ... MAX8997_LDO21:
 191                 *reg = MAX8997_REG_LDO1CTRL + (rid - MAX8997_LDO1);
 192                 *mask = 0xC0;
 193                 *pattern = 0xC0;
 194                 break;
 195         case MAX8997_BUCK1:
 196                 *reg = MAX8997_REG_BUCK1CTRL;
 197                 *mask = 0x01;
 198                 *pattern = 0x01;
 199                 break;
 200         case MAX8997_BUCK2:
 201                 *reg = MAX8997_REG_BUCK2CTRL;
 202                 *mask = 0x01;
 203                 *pattern = 0x01;
 204                 break;
 205         case MAX8997_BUCK3:
 206                 *reg = MAX8997_REG_BUCK3CTRL;
 207                 *mask = 0x01;
 208                 *pattern = 0x01;
 209                 break;
 210         case MAX8997_BUCK4:
 211                 *reg = MAX8997_REG_BUCK4CTRL;
 212                 *mask = 0x01;
 213                 *pattern = 0x01;
 214                 break;
 215         case MAX8997_BUCK5:
 216                 *reg = MAX8997_REG_BUCK5CTRL;
 217                 *mask = 0x01;
 218                 *pattern = 0x01;
 219                 break;
 220         case MAX8997_BUCK6:
 221                 *reg = MAX8997_REG_BUCK6CTRL;
 222                 *mask = 0x01;
 223                 *pattern = 0x01;
 224                 break;
 225         case MAX8997_BUCK7:
 226                 *reg = MAX8997_REG_BUCK7CTRL;
 227                 *mask = 0x01;
 228                 *pattern = 0x01;
 229                 break;
 230         case MAX8997_EN32KHZ_AP ... MAX8997_EN32KHZ_CP:
 231                 *reg = MAX8997_REG_MAINCON1;
 232                 *mask = 0x01 << (rid - MAX8997_EN32KHZ_AP);
 233                 *pattern = 0x01 << (rid - MAX8997_EN32KHZ_AP);
 234                 break;
 235         case MAX8997_ENVICHG:
 236                 *reg = MAX8997_REG_MBCCTRL1;
 237                 *mask = 0x80;
 238                 *pattern = 0x80;
 239                 break;
 240         case MAX8997_ESAFEOUT1 ... MAX8997_ESAFEOUT2:
 241                 *reg = MAX8997_REG_SAFEOUTCTRL;
 242                 *mask = 0x40 << (rid - MAX8997_ESAFEOUT1);
 243                 *pattern = 0x40 << (rid - MAX8997_ESAFEOUT1);
 244                 break;
 245         case MAX8997_CHARGER:
 246                 *reg = MAX8997_REG_MBCCTRL2;
 247                 *mask = 0x40;
 248                 *pattern = 0x40;
 249                 break;
 250         default:
 251                 /* Not controllable or not exists */
 252                 return -EINVAL;
 253         }
 254
 255         return 0;
 256 }
 257
 258 static int max8997_reg_is_enabled(struct regulator_dev *rdev)
 259 {
 260         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 261         struct i2c_client *i2c = max8997->iodev->i2c;
 262         int ret, reg, mask, pattern;
 263         u8 val;
 264
 265         ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
 266         if (ret)
 267                 return ret;
 268
 269         ret = max8997_read_reg(i2c, reg, &val);
 270         if (ret)
 271                 return ret;
 272
 273         return (val & mask) == pattern;
 274 }
 275
 276 static int max8997_reg_enable(struct regulator_dev *rdev)
 277 {
 278         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 279         struct i2c_client *i2c = max8997->iodev->i2c;
 280         int ret, reg, mask, pattern;
 281
 282         ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
 283         if (ret)
 284                 return ret;
 285
 286         return max8997_update_reg(i2c, reg, pattern, mask);
 287 }
 288
 289 static int max8997_reg_disable(struct regulator_dev *rdev)
 290 {
 291         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 292         struct i2c_client *i2c = max8997->iodev->i2c;
 293         int ret, reg, mask, pattern;
 294
 295         ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
 296         if (ret)
 297                 return ret;
 298
 299         return max8997_update_reg(i2c, reg, ~pattern, mask);
 300 }
 301
 302 static int max8997_get_voltage_register(struct regulator_dev *rdev,
 303                 int *_reg, int *_shift, int *_mask)
 304 {
 305         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 306         int rid = rdev_get_id(rdev);
 307         int reg, shift = 0, mask = 0x3f;
 308
 309         switch (rid) {
 310         case MAX8997_LDO1 ... MAX8997_LDO21:
 311                 reg = MAX8997_REG_LDO1CTRL + (rid - MAX8997_LDO1);
 312                 break;
 313         case MAX8997_BUCK1:
 314                 reg = MAX8997_REG_BUCK1DVS1;
 315                 if (max8997->buck1_gpiodvs)
 316                         reg += max8997->buck125_gpioindex;
 317                 break;
 318         case MAX8997_BUCK2:
 319                 reg = MAX8997_REG_BUCK2DVS1;
 320                 if (max8997->buck2_gpiodvs)
 321                         reg += max8997->buck125_gpioindex;
 322                 break;
 323         case MAX8997_BUCK3:
 324                 reg = MAX8997_REG_BUCK3DVS;
 325                 break;
 326         case MAX8997_BUCK4:
 327                 reg = MAX8997_REG_BUCK4DVS;
 328                 break;
 329         case MAX8997_BUCK5:
 330                 reg = MAX8997_REG_BUCK5DVS1;
 331                 if (max8997->buck5_gpiodvs)
 332                         reg += max8997->buck125_gpioindex;
 333                 break;
 334         case MAX8997_BUCK7:
 335                 reg = MAX8997_REG_BUCK7DVS;
 336                 break;
 337         case MAX8997_ESAFEOUT1 ...  MAX8997_ESAFEOUT2:
 338                 reg = MAX8997_REG_SAFEOUTCTRL;
 339                 shift = (rid == MAX8997_ESAFEOUT2) ? 2 : 0;
 340                 mask = 0x3;
 341                 break;
 342         case MAX8997_CHARGER_CV:
 343                 reg = MAX8997_REG_MBCCTRL3;
 344                 shift = 0;
 345                 mask = 0xf;
 346                 break;
 347         case MAX8997_CHARGER:
 348                 reg = MAX8997_REG_MBCCTRL4;
 349                 shift = 0;
 350                 mask = 0xf;
 351                 break;
 352         case MAX8997_CHARGER_TOPOFF:
 353                 reg = MAX8997_REG_MBCCTRL5;
 354                 shift = 0;
 355                 mask = 0xf;
 356                 break;
 357         default:
 358                 return -EINVAL;
 359         }
 360
 361         *_reg = reg;
 362         *_shift = shift;
 363         *_mask = mask;
 364
 365         return 0;
 366 }
 367
 368 static int max8997_get_voltage_sel(struct regulator_dev *rdev)
 369 {
 370         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 371         struct i2c_client *i2c = max8997->iodev->i2c;
 372         int reg, shift, mask, ret;
 373         u8 val;
 374
 375         ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
 376         if (ret)
 377                 return ret;
 378
 379         ret = max8997_read_reg(i2c, reg, &val);
 380         if (ret)
 381                 return ret;
 382
 383         val >>= shift;
 384         val &= mask;
 385
 386         return val;
 387 }
 388
 389 static inline int max8997_get_voltage_proper_val(
 390                 const struct voltage_map_desc *desc,
 391                 int min_vol, int max_vol)
 392 {
 393         int i;
 394
 395         if (desc == NULL)
 396                 return -EINVAL;
 397
 398         if (max_vol < desc->min || min_vol > desc->max)
 399                 return -EINVAL;
 400
 401         if (min_vol < desc->min)
 402                 min_vol = desc->min;
 403
 404         i = DIV_ROUND_UP(min_vol - desc->min, desc->step);
 405
 406         if (desc->min + desc->step * i > max_vol)
 407                 return -EINVAL;
 408
 409         return i;
 410 }
 411
 412 static int max8997_set_voltage_charger_cv(struct regulator_dev *rdev,
 413                 int min_uV, int max_uV, unsigned *selector)
 414 {
 415         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 416         struct i2c_client *i2c = max8997->iodev->i2c;
 417         int rid = rdev_get_id(rdev);
 418         int lb, ub;
 419         int reg, shift = 0, mask, ret = 0;
 420         u8 val = 0x0;
 421
 422         if (rid != MAX8997_CHARGER_CV)
 423                 return -EINVAL;
 424
 425         ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
 426         if (ret)
 427                 return ret;
 428
 429         if (max_uV < 4000000 || min_uV > 4350000)
 430                 return -EINVAL;
 431
 432         if (min_uV <= 4000000) {
 433                 if (max_uV >= 4000000)
 434                         return -EINVAL;
 435                 else
 436                         val = 0x1;
 437         } else if (min_uV <= 4200000 && max_uV >= 4200000)
 438                 val = 0x0;
 439         else {
 440                 lb = (min_uV - 4000001) / 20000 + 2;
 441                 ub = (max_uV - 4000000) / 20000 + 1;
 442
 443                 if (lb > ub)
 444                         return -EINVAL;
 445
 446                 if (lb < 0xf)
 447                         val = lb;
 448                 else {
 449                         if (ub >= 0xf)
 450                                 val = 0xf;
 451                         else
 452                                 return -EINVAL;
 453                 }
 454         }
 455
 456         *selector = val;
 457
 458         ret = max8997_update_reg(i2c, reg, val << shift, mask);
 459
 460         return ret;
 461 }
 462
 463 /*
 464  * For LDO1 ~ LDO21, BUCK1~5, BUCK7, CHARGER, CHARGER_TOPOFF
 465  * BUCK1, 2, and 5 are available if they are not controlled by gpio
 466  */
 467 static int max8997_set_voltage_ldobuck(struct regulator_dev *rdev,
 468                 int min_uV, int max_uV, unsigned *selector)
 469 {
 470         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 471         struct i2c_client *i2c = max8997->iodev->i2c;
 472         const struct voltage_map_desc *desc;
 473         int rid = rdev_get_id(rdev);
 474         int i, reg, shift, mask, ret;
 475
 476         switch (rid) {
 477         case MAX8997_LDO1 ... MAX8997_LDO21:
 478                 break;
 479         case MAX8997_BUCK1 ... MAX8997_BUCK5:
 480                 break;
 481         case MAX8997_BUCK6:
 482                 return -EINVAL;
 483         case MAX8997_BUCK7:
 484                 break;
 485         case MAX8997_CHARGER:
 486                 break;
 487         case MAX8997_CHARGER_TOPOFF:
 488                 break;
 489         default:
 490                 return -EINVAL;
 491         }
 492
 493         desc = reg_voltage_map[rid];
 494
 495         i = max8997_get_voltage_proper_val(desc, min_uV, max_uV);
 496         if (i < 0)
 497                 return i;
 498
 499         ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
 500         if (ret)
 501                 return ret;
 502
 503         ret = max8997_update_reg(i2c, reg, i << shift, mask << shift);
 504         *selector = i;
 505
 506         return ret;
 507 }
 508
 509 static int max8997_set_voltage_buck_time_sel(struct regulator_dev *rdev,
 510                                                 unsigned int old_selector,
 511                                                 unsigned int new_selector)
 512 {
 513         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 514         int rid = rdev_get_id(rdev);
 515         const struct voltage_map_desc *desc = reg_voltage_map[rid];
 516
 517         /* Delay is required only if the voltage is increasing */
 518         if (old_selector >= new_selector)
 519                 return 0;
 520
 521         /* No need to delay if gpio_dvs_mode */
 522         switch (rid) {
 523         case MAX8997_BUCK1:
 524                 if (max8997->buck1_gpiodvs)
 525                         return 0;
 526                 break;
 527         case MAX8997_BUCK2:
 528                 if (max8997->buck2_gpiodvs)
 529                         return 0;
 530                 break;
 531         case MAX8997_BUCK5:
 532                 if (max8997->buck5_gpiodvs)
 533                         return 0;
 534                 break;
 535         }
 536
 537         switch (rid) {
 538         case MAX8997_BUCK1:
 539         case MAX8997_BUCK2:
 540         case MAX8997_BUCK4:
 541         case MAX8997_BUCK5:
 542                 return DIV_ROUND_UP(desc->step * (new_selector - old_selector),
 543                                     max8997->ramp_delay * 1000);
 544         }
 545
 546         return 0;
 547 }
 548
 549 /*
 550  * Assess the damage on the voltage setting of BUCK1,2,5 by the change.
 551  *
 552  * When GPIO-DVS mode is used for multiple bucks, changing the voltage value
 553  * of one of the bucks may affect that of another buck, which is the side
 554  * effect of the change (set_voltage). This function examines the GPIO-DVS
 555  * configurations and checks whether such side-effect exists.
 556  */
 557 static int max8997_assess_side_effect(struct regulator_dev *rdev,
 558                 u8 new_val, int *best)
 559 {
 560         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 561         int rid = rdev_get_id(rdev);
 562         u8 *buckx_val[3];
 563         bool buckx_gpiodvs[3];
 564         int side_effect[8];
 565         int min_side_effect = INT_MAX;
 566         int i;
 567
 568         *best = -1;
 569
 570         switch (rid) {
 571         case MAX8997_BUCK1:
 572                 rid = 0;
 573                 break;
 574         case MAX8997_BUCK2:
 575                 rid = 1;
 576                 break;
 577         case MAX8997_BUCK5:
 578                 rid = 2;
 579                 break;
 580         default:
 581                 return -EINVAL;
 582         }
 583
 584         buckx_val[0] = max8997->buck1_vol;
 585         buckx_val[1] = max8997->buck2_vol;
 586         buckx_val[2] = max8997->buck5_vol;
 587         buckx_gpiodvs[0] = max8997->buck1_gpiodvs;
 588         buckx_gpiodvs[1] = max8997->buck2_gpiodvs;
 589         buckx_gpiodvs[2] = max8997->buck5_gpiodvs;
 590
 591         for (i = 0; i < 8; i++) {
 592                 int others;
 593
 594                 if (new_val != (buckx_val[rid])[i]) {
 595                         side_effect[i] = -1;
 596                         continue;
 597                 }
 598
 599                 side_effect[i] = 0;
 600                 for (others = 0; others < 3; others++) {
 601                         int diff;
 602
 603                         if (others == rid)
 604                                 continue;
 605                         if (buckx_gpiodvs[others] == false)
 606                                 continue; /* Not affected */
 607                         diff = (buckx_val[others])[i] -
 608                                 (buckx_val[others])[max8997->buck125_gpioindex];
 609                         if (diff > 0)
 610                                 side_effect[i] += diff;
 611                         else if (diff < 0)
 612                                 side_effect[i] -= diff;
 613                 }
 614                 if (side_effect[i] == 0) {
 615                         *best = i;
 616                         return 0; /* NO SIDE EFFECT! Use This! */
 617                 }
 618                 if (side_effect[i] < min_side_effect) {
 619                         min_side_effect = side_effect[i];
 620                         *best = i;
 621                 }
 622         }
 623
 624         if (*best == -1)
 625                 return -EINVAL;
 626
 627         return side_effect[*best];
 628 }
 629
 630 /*
 631  * For Buck 1 ~ 5 and 7. If it is not controlled by GPIO, this calls
 632  * max8997_set_voltage_ldobuck to do the job.
 633  */
 634 static int max8997_set_voltage_buck(struct regulator_dev *rdev,
 635                 int min_uV, int max_uV, unsigned *selector)
 636 {
 637         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 638         int rid = rdev_get_id(rdev);
 639         const struct voltage_map_desc *desc;
 640         int new_val, new_idx, damage, tmp_val, tmp_idx, tmp_dmg;
 641         bool gpio_dvs_mode = false;
 642
 643         if (rid < MAX8997_BUCK1 || rid > MAX8997_BUCK7)
 644                 return -EINVAL;
 645
 646         switch (rid) {
 647         case MAX8997_BUCK1:
 648                 if (max8997->buck1_gpiodvs)
 649                         gpio_dvs_mode = true;
 650                 break;
 651         case MAX8997_BUCK2:
 652                 if (max8997->buck2_gpiodvs)
 653                         gpio_dvs_mode = true;
 654                 break;
 655         case MAX8997_BUCK5:
 656                 if (max8997->buck5_gpiodvs)
 657                         gpio_dvs_mode = true;
 658                 break;
 659         }
 660
 661         if (!gpio_dvs_mode)
 662                 return max8997_set_voltage_ldobuck(rdev, min_uV, max_uV,
 663                                                 selector);
 664
 665         desc = reg_voltage_map[rid];
 666         new_val = max8997_get_voltage_proper_val(desc, min_uV, max_uV);
 667         if (new_val < 0)
 668                 return new_val;
 669
 670         tmp_dmg = INT_MAX;
 671         tmp_idx = -1;
 672         tmp_val = -1;
 673         do {
 674                 damage = max8997_assess_side_effect(rdev, new_val, &new_idx);
 675                 if (damage == 0)
 676                         goto out;
 677
 678                 if (tmp_dmg > damage) {
 679                         tmp_idx = new_idx;
 680                         tmp_val = new_val;
 681                         tmp_dmg = damage;
 682                 }
 683
 684                 new_val++;
 685         } while (desc->min + desc->step * new_val <= desc->max);
 686
 687         new_idx = tmp_idx;
 688         new_val = tmp_val;
 689
 690         if (max8997->ignore_gpiodvs_side_effect == false)
 691                 return -EINVAL;
 692
 693         dev_warn(&rdev->dev, "MAX8997 GPIO-DVS Side Effect Warning: GPIO SET:"
 694                         " %d -> %d\n", max8997->buck125_gpioindex, tmp_idx);
 695
 696 out:
 697         if (new_idx < 0 || new_val < 0)
 698                 return -EINVAL;
 699
 700         max8997->buck125_gpioindex = new_idx;
 701         max8997_set_gpio(max8997);
 702         *selector = new_val;
 703
 704         return 0;
 705 }
 706
 707 /* For SAFEOUT1 and SAFEOUT2 */
 708 static int max8997_set_voltage_safeout_sel(struct regulator_dev *rdev,
 709                                            unsigned selector)
 710 {
 711         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 712         struct i2c_client *i2c = max8997->iodev->i2c;
 713         int rid = rdev_get_id(rdev);
 714         int reg, shift = 0, mask, ret;
 715
 716         if (rid != MAX8997_ESAFEOUT1 && rid != MAX8997_ESAFEOUT2)
 717                 return -EINVAL;
 718
 719         ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
 720         if (ret)
 721                 return ret;
 722
 723         return max8997_update_reg(i2c, reg, selector << shift, mask << shift);
 724 }
 725
 726 static int max8997_reg_disable_suspend(struct regulator_dev *rdev)
 727 {
 728         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 729         struct i2c_client *i2c = max8997->iodev->i2c;
 730         int ret, reg, mask, pattern;
 731         int rid = rdev_get_id(rdev);
 732
 733         ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
 734         if (ret)
 735                 return ret;
 736
 737         max8997_read_reg(i2c, reg, &max8997->saved_states[rid]);
 738
 739         if (rid == MAX8997_LDO1 ||
 740                         rid == MAX8997_LDO10 ||
 741                         rid == MAX8997_LDO21) {
 742                 dev_dbg(&rdev->dev, "Conditional Power-Off for %s\n",
 743                                 rdev->desc->name);
 744                 return max8997_update_reg(i2c, reg, 0x40, mask);
 745         }
 746
 747         dev_dbg(&rdev->dev, "Full Power-Off for %s (%xh -> %xh)\n",
 748                         rdev->desc->name, max8997->saved_states[rid] & mask,
 749                         (~pattern) & mask);
 750         return max8997_update_reg(i2c, reg, ~pattern, mask);
 751 }
 752
 753 static struct regulator_ops max8997_ldo_ops = {
 754         .list_voltage           = max8997_list_voltage,
 755         .is_enabled             = max8997_reg_is_enabled,
 756         .enable                 = max8997_reg_enable,
 757         .disable                = max8997_reg_disable,
 758         .get_voltage_sel        = max8997_get_voltage_sel,
 759         .set_voltage            = max8997_set_voltage_ldobuck,
 760         .set_suspend_disable    = max8997_reg_disable_suspend,
 761 };
 762
 763 static struct regulator_ops max8997_buck_ops = {
 764         .list_voltage           = max8997_list_voltage,
 765         .is_enabled             = max8997_reg_is_enabled,
 766         .enable                 = max8997_reg_enable,
 767         .disable                = max8997_reg_disable,
 768         .get_voltage_sel        = max8997_get_voltage_sel,
 769         .set_voltage            = max8997_set_voltage_buck,
 770         .set_voltage_time_sel   = max8997_set_voltage_buck_time_sel,
 771         .set_suspend_disable    = max8997_reg_disable_suspend,
 772 };
 773
 774 static struct regulator_ops max8997_fixedvolt_ops = {
 775         .list_voltage           = max8997_list_voltage,
 776         .is_enabled             = max8997_reg_is_enabled,
 777         .enable                 = max8997_reg_enable,
 778         .disable                = max8997_reg_disable,
 779         .set_suspend_disable    = max8997_reg_disable_suspend,
 780 };
 781
 782 static struct regulator_ops max8997_safeout_ops = {
 783         .list_voltage           = regulator_list_voltage_table,
 784         .is_enabled             = max8997_reg_is_enabled,
 785         .enable                 = max8997_reg_enable,
 786         .disable                = max8997_reg_disable,
 787         .get_voltage_sel        = max8997_get_voltage_sel,
 788         .set_voltage_sel        = max8997_set_voltage_safeout_sel,
 789         .set_suspend_disable    = max8997_reg_disable_suspend,
 790 };
 791
 792 static struct regulator_ops max8997_fixedstate_ops = {
 793         .list_voltage           = max8997_list_voltage_charger_cv,
 794         .get_voltage_sel        = max8997_get_voltage_sel,
 795         .set_voltage            = max8997_set_voltage_charger_cv,
 796 };
 797
 798 static int max8997_set_current_limit(struct regulator_dev *rdev,
 799                                      int min_uA, int max_uA)
 800 {
 801         unsigned dummy;
 802         int rid = rdev_get_id(rdev);
 803
 804         if (rid != MAX8997_CHARGER && rid != MAX8997_CHARGER_TOPOFF)
 805                 return -EINVAL;
 806
 807         /* Reuse max8997_set_voltage_ldobuck to set current_limit. */
 808         return max8997_set_voltage_ldobuck(rdev, min_uA, max_uA, &dummy);
 809 }
 810
 811 static int max8997_get_current_limit(struct regulator_dev *rdev)
 812 {
 813         int sel, rid = rdev_get_id(rdev);
 814
 815         if (rid != MAX8997_CHARGER && rid != MAX8997_CHARGER_TOPOFF)
 816                 return -EINVAL;
 817
 818         sel = max8997_get_voltage_sel(rdev);
 819         if (sel < 0)
 820                 return sel;
 821
 822         /* Reuse max8997_list_voltage to get current_limit. */
 823         return max8997_list_voltage(rdev, sel);
 824 }
 825
 826 static struct regulator_ops max8997_charger_ops = {
 827         .is_enabled             = max8997_reg_is_enabled,
 828         .enable                 = max8997_reg_enable,
 829         .disable                = max8997_reg_disable,
 830         .get_current_limit      = max8997_get_current_limit,
 831         .set_current_limit      = max8997_set_current_limit,
 832 };
 833
 834 static struct regulator_ops max8997_charger_fixedstate_ops = {
 835         .get_current_limit      = max8997_get_current_limit,
 836         .set_current_limit      = max8997_set_current_limit,
 837 };
 838
 839 #define MAX8997_VOLTAGE_REGULATOR(_name, _ops) {\
 840         .name           = #_name,               \
 841         .id             = MAX8997_##_name,      \
 842         .ops            = &_ops,                \
 843         .type           = REGULATOR_VOLTAGE,    \
 844         .owner          = THIS_MODULE,          \
 845 }
 846
 847 #define MAX8997_CURRENT_REGULATOR(_name, _ops) {\
 848         .name           = #_name,               \
 849         .id             = MAX8997_##_name,      \
 850         .ops            = &_ops,                \
 851         .type           = REGULATOR_CURRENT,    \
 852         .owner          = THIS_MODULE,          \
 853 }
 854
 855 static struct regulator_desc regulators[] = {
 856         MAX8997_VOLTAGE_REGULATOR(LDO1, max8997_ldo_ops),
 857         MAX8997_VOLTAGE_REGULATOR(LDO2, max8997_ldo_ops),
 858         MAX8997_VOLTAGE_REGULATOR(LDO3, max8997_ldo_ops),
 859         MAX8997_VOLTAGE_REGULATOR(LDO4, max8997_ldo_ops),
 860         MAX8997_VOLTAGE_REGULATOR(LDO5, max8997_ldo_ops),
 861         MAX8997_VOLTAGE_REGULATOR(LDO6, max8997_ldo_ops),
 862         MAX8997_VOLTAGE_REGULATOR(LDO7, max8997_ldo_ops),
 863         MAX8997_VOLTAGE_REGULATOR(LDO8, max8997_ldo_ops),
 864         MAX8997_VOLTAGE_REGULATOR(LDO9, max8997_ldo_ops),
 865         MAX8997_VOLTAGE_REGULATOR(LDO10, max8997_ldo_ops),
 866         MAX8997_VOLTAGE_REGULATOR(LDO11, max8997_ldo_ops),
 867         MAX8997_VOLTAGE_REGULATOR(LDO12, max8997_ldo_ops),
 868         MAX8997_VOLTAGE_REGULATOR(LDO13, max8997_ldo_ops),
 869         MAX8997_VOLTAGE_REGULATOR(LDO14, max8997_ldo_ops),
 870         MAX8997_VOLTAGE_REGULATOR(LDO15, max8997_ldo_ops),
 871         MAX8997_VOLTAGE_REGULATOR(LDO16, max8997_ldo_ops),
 872         MAX8997_VOLTAGE_REGULATOR(LDO17, max8997_ldo_ops),
 873         MAX8997_VOLTAGE_REGULATOR(LDO18, max8997_ldo_ops),
 874         MAX8997_VOLTAGE_REGULATOR(LDO21, max8997_ldo_ops),
 875         MAX8997_VOLTAGE_REGULATOR(BUCK1, max8997_buck_ops),
 876         MAX8997_VOLTAGE_REGULATOR(BUCK2, max8997_buck_ops),
 877         MAX8997_VOLTAGE_REGULATOR(BUCK3, max8997_buck_ops),
 878         MAX8997_VOLTAGE_REGULATOR(BUCK4, max8997_buck_ops),
 879         MAX8997_VOLTAGE_REGULATOR(BUCK5, max8997_buck_ops),
 880         MAX8997_VOLTAGE_REGULATOR(BUCK6, max8997_fixedvolt_ops),
 881         MAX8997_VOLTAGE_REGULATOR(BUCK7, max8997_buck_ops),
 882         MAX8997_VOLTAGE_REGULATOR(EN32KHZ_AP, max8997_fixedvolt_ops),
 883         MAX8997_VOLTAGE_REGULATOR(EN32KHZ_CP, max8997_fixedvolt_ops),
 884         MAX8997_VOLTAGE_REGULATOR(ENVICHG, max8997_fixedvolt_ops),
 885         MAX8997_VOLTAGE_REGULATOR(ESAFEOUT1, max8997_safeout_ops),
 886         MAX8997_VOLTAGE_REGULATOR(ESAFEOUT2, max8997_safeout_ops),
 887         MAX8997_VOLTAGE_REGULATOR(CHARGER_CV, max8997_fixedstate_ops),
 888         MAX8997_CURRENT_REGULATOR(CHARGER, max8997_charger_ops),
 889         MAX8997_CURRENT_REGULATOR(CHARGER_TOPOFF,
 890                                   max8997_charger_fixedstate_ops),
 891 };
 892
 893 #ifdef CONFIG_OF
 894 static int max8997_pmic_dt_parse_dvs_gpio(struct platform_device *pdev,
 895                         struct max8997_platform_data *pdata,
 896                         struct device_node *pmic_np)
 897 {
 898         int i, gpio;
 899
 900         for (i = 0; i < 3; i++) {
 901                 gpio = of_get_named_gpio(pmic_np,
 902                                         "max8997,pmic-buck125-dvs-gpios", i);
 903                 if (!gpio_is_valid(gpio)) {
 904                         dev_err(&pdev->dev, "invalid gpio[%d]: %d\n", i, gpio);
 905                         return -EINVAL;
 906                 }
 907                 pdata->buck125_gpios[i] = gpio;
 908         }
 909         return 0;
 910 }
 911
 912 static int max8997_pmic_dt_parse_pdata(struct platform_device *pdev,
 913                                         struct max8997_platform_data *pdata)
 914 {
 915         struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 916         struct device_node *pmic_np, *regulators_np, *reg_np;
 917         struct max8997_regulator_data *rdata;
 918         unsigned int i, dvs_voltage_nr = 1, ret;
 919
 920         pmic_np = of_node_get(iodev->dev->of_node);
 921         if (!pmic_np) {
 922                 dev_err(&pdev->dev, "could not find pmic sub-node\n");
 923                 return -ENODEV;
 924         }
 925
 926         regulators_np = of_find_node_by_name(pmic_np, "regulators");
 927         if (!regulators_np) {
 928                 dev_err(&pdev->dev, "could not find regulators sub-node\n");
 929                 return -EINVAL;
 930         }
 931
 932         /* count the number of regulators to be supported in pmic */
 933         pdata->num_regulators = of_get_child_count(regulators_np);
 934
 935         rdata = devm_kzalloc(&pdev->dev, sizeof(*rdata) *
 936                                 pdata->num_regulators, GFP_KERNEL);
 937         if (!rdata) {
 938                 of_node_put(regulators_np);
 939                 dev_err(&pdev->dev, "could not allocate memory for regulator data\n");
 940                 return -ENOMEM;
 941         }
 942
 943         pdata->regulators = rdata;
 944         for_each_child_of_node(regulators_np, reg_np) {
 945                 for (i = 0; i < ARRAY_SIZE(regulators); i++)
 946                         if (!of_node_cmp(reg_np->name, regulators[i].name))
 947                                 break;
 948
 949                 if (i == ARRAY_SIZE(regulators)) {
 950                         dev_warn(&pdev->dev, "don't know how to configure regulator %s\n",
 951                                  reg_np->name);
 952                         continue;
 953                 }
 954
 955                 rdata->id = i;
 956                 rdata->initdata = of_get_regulator_init_data(&pdev->dev,
 957                                                              reg_np);
 958                 rdata->reg_node = reg_np;
 959                 rdata++;
 960         }
 961         of_node_put(regulators_np);
 962
 963         if (of_get_property(pmic_np, "max8997,pmic-buck1-uses-gpio-dvs", NULL))
 964                 pdata->buck1_gpiodvs = true;
 965
 966         if (of_get_property(pmic_np, "max8997,pmic-buck2-uses-gpio-dvs", NULL))
 967                 pdata->buck2_gpiodvs = true;
 968
 969         if (of_get_property(pmic_np, "max8997,pmic-buck5-uses-gpio-dvs", NULL))
 970                 pdata->buck5_gpiodvs = true;
 971
 972         if (pdata->buck1_gpiodvs || pdata->buck2_gpiodvs ||
 973                                                 pdata->buck5_gpiodvs) {
 974                 ret = max8997_pmic_dt_parse_dvs_gpio(pdev, pdata, pmic_np);
 975                 if (ret)
 976                         return -EINVAL;
 977
 978                 if (of_property_read_u32(pmic_np,
 979                                 "max8997,pmic-buck125-default-dvs-idx",
 980                                 &pdata->buck125_default_idx)) {
 981                         pdata->buck125_default_idx = 0;
 982                 } else {
 983                         if (pdata->buck125_default_idx >= 8) {
 984                                 pdata->buck125_default_idx = 0;
 985                                 dev_info(&pdev->dev, "invalid value for default dvs index, using 0 instead\n");
 986                         }
 987                 }
 988
 989                 if (of_get_property(pmic_np,
 990                         "max8997,pmic-ignore-gpiodvs-side-effect", NULL))
 991                         pdata->ignore_gpiodvs_side_effect = true;
 992
 993                 dvs_voltage_nr = 8;
 994         }
 995
 996         if (of_property_read_u32_array(pmic_np,
 997                                 "max8997,pmic-buck1-dvs-voltage",
 998                                 pdata->buck1_voltage, dvs_voltage_nr)) {
 999                 dev_err(&pdev->dev, "buck1 voltages not specified\n");
1000                 return -EINVAL;
1001         }
1002
1003         if (of_property_read_u32_array(pmic_np,
1004                                 "max8997,pmic-buck2-dvs-voltage",
1005                                 pdata->buck2_voltage, dvs_voltage_nr)) {
1006                 dev_err(&pdev->dev, "buck2 voltages not specified\n");
1007                 return -EINVAL;
1008         }
1009
1010         if (of_property_read_u32_array(pmic_np,
1011                                 "max8997,pmic-buck5-dvs-voltage",
1012                                 pdata->buck5_voltage, dvs_voltage_nr)) {
1013                 dev_err(&pdev->dev, "buck5 voltages not specified\n");
1014                 return -EINVAL;
1015         }
1016
1017         return 0;
1018 }
1019 #else
1020 static int max8997_pmic_dt_parse_pdata(struct platform_device *pdev,
1021                                         struct max8997_platform_data *pdata)
1022 {
1023         return 0;
1024 }
1025 #endif /* CONFIG_OF */
1026
1027 static int max8997_pmic_probe(struct platform_device *pdev)
1028 {
1029         struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
1030         struct max8997_platform_data *pdata = iodev->pdata;
1031         struct regulator_config config = { };
1032         struct regulator_dev **rdev;
1033         struct max8997_data *max8997;
1034         struct i2c_client *i2c;
1035         int i, ret, size, nr_dvs;
1036         u8 max_buck1 = 0, max_buck2 = 0, max_buck5 = 0;
1037
1038         if (IS_ERR_OR_NULL(pdata)) {
1039                 dev_err(pdev->dev.parent, "No platform init data supplied.\n");
1040                 return -ENODEV;
1041         }
1042
1043         if (iodev->dev->of_node) {
1044                 ret = max8997_pmic_dt_parse_pdata(pdev, pdata);
1045                 if (ret)
1046                         return ret;
1047         }
1048
1049         max8997 = devm_kzalloc(&pdev->dev, sizeof(struct max8997_data),
1050                                GFP_KERNEL);
1051         if (!max8997)
1052                 return -ENOMEM;
1053
1054         size = sizeof(struct regulator_dev *) * pdata->num_regulators;
1055         max8997->rdev = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
1056         if (!max8997->rdev)
1057                 return -ENOMEM;
1058
1059         rdev = max8997->rdev;
1060         max8997->dev = &pdev->dev;
1061         max8997->iodev = iodev;
1062         max8997->num_regulators = pdata->num_regulators;
1063         platform_set_drvdata(pdev, max8997);
1064         i2c = max8997->iodev->i2c;
1065
1066         max8997->buck125_gpioindex = pdata->buck125_default_idx;
1067         max8997->buck1_gpiodvs = pdata->buck1_gpiodvs;
1068         max8997->buck2_gpiodvs = pdata->buck2_gpiodvs;
1069         max8997->buck5_gpiodvs = pdata->buck5_gpiodvs;
1070         memcpy(max8997->buck125_gpios, pdata->buck125_gpios, sizeof(int) * 3);
1071         max8997->ignore_gpiodvs_side_effect = pdata->ignore_gpiodvs_side_effect;
1072
1073         nr_dvs = (pdata->buck1_gpiodvs || pdata->buck2_gpiodvs ||
1074                         pdata->buck5_gpiodvs) ? 8 : 1;
1075
1076         for (i = 0; i < nr_dvs; i++) {
1077                 max8997->buck1_vol[i] = ret =
1078                         max8997_get_voltage_proper_val(
1079                                         &buck1245_voltage_map_desc,
1080                                         pdata->buck1_voltage[i],
1081                                         pdata->buck1_voltage[i] +
1082                                         buck1245_voltage_map_desc.step);
1083                 if (ret < 0)
1084                         goto err_out;
1085
1086                 max8997->buck2_vol[i] = ret =
1087                         max8997_get_voltage_proper_val(
1088                                         &buck1245_voltage_map_desc,
1089                                         pdata->buck2_voltage[i],
1090                                         pdata->buck2_voltage[i] +
1091                                         buck1245_voltage_map_desc.step);
1092                 if (ret < 0)
1093                         goto err_out;
1094
1095                 max8997->buck5_vol[i] = ret =
1096                         max8997_get_voltage_proper_val(
1097                                         &buck1245_voltage_map_desc,
1098                                         pdata->buck5_voltage[i],
1099                                         pdata->buck5_voltage[i] +
1100                                         buck1245_voltage_map_desc.step);
1101                 if (ret < 0)
1102                         goto err_out;
1103
1104                 if (max_buck1 < max8997->buck1_vol[i])
1105                         max_buck1 = max8997->buck1_vol[i];
1106                 if (max_buck2 < max8997->buck2_vol[i])
1107                         max_buck2 = max8997->buck2_vol[i];
1108                 if (max_buck5 < max8997->buck5_vol[i])
1109                         max_buck5 = max8997->buck5_vol[i];
1110         }
1111
1112         /* For the safety, set max voltage before setting up */
1113         for (i = 0; i < 8; i++) {
1114                 max8997_update_reg(i2c, MAX8997_REG_BUCK1DVS1 + i,
1115                                 max_buck1, 0x3f);
1116                 max8997_update_reg(i2c, MAX8997_REG_BUCK2DVS1 + i,
1117                                 max_buck2, 0x3f);
1118                 max8997_update_reg(i2c, MAX8997_REG_BUCK5DVS1 + i,
1119                                 max_buck5, 0x3f);
1120         }
1121
1122         /* Initialize all the DVS related BUCK registers */
1123         for (i = 0; i < nr_dvs; i++) {
1124                 max8997_update_reg(i2c, MAX8997_REG_BUCK1DVS1 + i,
1125                                 max8997->buck1_vol[i],
1126                                 0x3f);
1127                 max8997_update_reg(i2c, MAX8997_REG_BUCK2DVS1 + i,
1128                                 max8997->buck2_vol[i],
1129                                 0x3f);
1130                 max8997_update_reg(i2c, MAX8997_REG_BUCK5DVS1 + i,
1131                                 max8997->buck5_vol[i],
1132                                 0x3f);
1133         }
1134
1135         /*
1136          * If buck 1, 2, and 5 do not care DVS GPIO settings, ignore them.
1137          * If at least one of them cares, set gpios.
1138          */
1139         if (pdata->buck1_gpiodvs || pdata->buck2_gpiodvs ||
1140                         pdata->buck5_gpiodvs) {
1141
1142                 if (!gpio_is_valid(pdata->buck125_gpios[0]) ||
1143                                 !gpio_is_valid(pdata->buck125_gpios[1]) ||
1144                                 !gpio_is_valid(pdata->buck125_gpios[2])) {
1145                         dev_err(&pdev->dev, "GPIO NOT VALID\n");
1146                         ret = -EINVAL;
1147                         goto err_out;
1148                 }
1149
1150                 ret = devm_gpio_request(&pdev->dev, pdata->buck125_gpios[0],
1151                                         "MAX8997 SET1");
1152                 if (ret)
1153                         goto err_out;
1154
1155                 ret = devm_gpio_request(&pdev->dev, pdata->buck125_gpios[1],
1156                                         "MAX8997 SET2");
1157                 if (ret)
1158                         goto err_out;
1159
1160                 ret = devm_gpio_request(&pdev->dev, pdata->buck125_gpios[2],
1161                                 "MAX8997 SET3");
1162                 if (ret)
1163                         goto err_out;
1164
1165                 gpio_direction_output(pdata->buck125_gpios[0],
1166                                 (max8997->buck125_gpioindex >> 2)
1167                                 & 0x1); /* SET1 */
1168                 gpio_direction_output(pdata->buck125_gpios[1],
1169                                 (max8997->buck125_gpioindex >> 1)
1170                                 & 0x1); /* SET2 */
1171                 gpio_direction_output(pdata->buck125_gpios[2],
1172                                 (max8997->buck125_gpioindex >> 0)
1173                                 & 0x1); /* SET3 */
1174         }
1175
1176         /* DVS-GPIO disabled */
1177         max8997_update_reg(i2c, MAX8997_REG_BUCK1CTRL, (pdata->buck1_gpiodvs) ?
1178                         (1 << 1) : (0 << 1), 1 << 1);
1179         max8997_update_reg(i2c, MAX8997_REG_BUCK2CTRL, (pdata->buck2_gpiodvs) ?
1180                         (1 << 1) : (0 << 1), 1 << 1);
1181         max8997_update_reg(i2c, MAX8997_REG_BUCK5CTRL, (pdata->buck5_gpiodvs) ?
1182                         (1 << 1) : (0 << 1), 1 << 1);
1183
1184         /* Misc Settings */
1185         max8997->ramp_delay = 10; /* set 10mV/us, which is the default */
1186         max8997_write_reg(i2c, MAX8997_REG_BUCKRAMP, (0xf << 4) | 0x9);
1187
1188         for (i = 0; i < pdata->num_regulators; i++) {
1189                 const struct voltage_map_desc *desc;
1190                 int id = pdata->regulators[i].id;
1191
1192                 desc = reg_voltage_map[id];
1193                 if (desc) {
1194                         regulators[id].n_voltages =
1195                                 (desc->max - desc->min) / desc->step + 1;
1196                 } else if (id == MAX8997_ESAFEOUT1 || id == MAX8997_ESAFEOUT2) {
1197                         regulators[id].volt_table = safeoutvolt;
1198                         regulators[id].n_voltages = ARRAY_SIZE(safeoutvolt);
1199                 } else if (id == MAX8997_CHARGER_CV) {
1200                         regulators[id].n_voltages = 16;
1201                 }
1202
1203                 config.dev = max8997->dev;
1204                 config.init_data = pdata->regulators[i].initdata;
1205                 config.driver_data = max8997;
1206                 config.of_node = pdata->regulators[i].reg_node;
1207
1208                 rdev[i] = regulator_register(&regulators[id], &config);
1209                 if (IS_ERR(rdev[i])) {
1210                         ret = PTR_ERR(rdev[i]);
1211                         dev_err(max8997->dev, "regulator init failed for %d\n",
1212                                         id);
1213                         rdev[i] = NULL;
1214                         goto err;
1215                 }
1216         }
1217
1218         return 0;
1219 err:
1220         while (--i >= 0)
1221                 regulator_unregister(rdev[i]);
1222 err_out:
1223         return ret;
1224 }
1225
1226 static int max8997_pmic_remove(struct platform_device *pdev)
1227 {
1228         struct max8997_data *max8997 = platform_get_drvdata(pdev);
1229         struct regulator_dev **rdev = max8997->rdev;
1230         int i;
1231
1232         for (i = 0; i < max8997->num_regulators; i++)
1233                 regulator_unregister(rdev[i]);
1234         return 0;
1235 }
1236
1237 static const struct platform_device_id max8997_pmic_id[] = {
1238         { "max8997-pmic", 0},
1239         { },
1240 };
1241 MODULE_DEVICE_TABLE(platform, max8997_pmic_id);
1242
1243 static struct platform_driver max8997_pmic_driver = {
1244         .driver = {
1245                 .name = "max8997-pmic",
1246                 .owner = THIS_MODULE,
1247         },
1248         .probe = max8997_pmic_probe,
1249         .remove = max8997_pmic_remove,
1250         .id_table = max8997_pmic_id,
1251 };
1252
1253 static int __init max8997_pmic_init(void)
1254 {
1255         return platform_driver_register(&max8997_pmic_driver);
1256 }
1257 subsys_initcall(max8997_pmic_init);
1258
1259 static void __exit max8997_pmic_cleanup(void)
1260 {
1261         platform_driver_unregister(&max8997_pmic_driver);
1262 }
1263 module_exit(max8997_pmic_cleanup);
1264
1265 MODULE_DESCRIPTION("MAXIM 8997/8966 Regulator Driver");
1266 MODULE_AUTHOR("MyungJoo Ham <[email protected]>");
1267 MODULE_LICENSE("GPL");