drivers/regulator/max8997.c

   1 /*
   2  * max8997.c - Regulator driver for the Maxim 8997/8966
   3  *
   4  * Copyright (C) 2011 Samsung Electronics
   5  * MyungJoo Ham <myungjoo.ham@smasung.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  *
  21  * This driver is based on max8998.c
  22  */
  23
  24 #include <linux/bug.h>
  25 #include <linux/err.h>
  26 #include <linux/gpio.h>
  27 #include <linux/slab.h>
  28 #include <linux/module.h>
  29 #include <linux/platform_device.h>
  30 #include <linux/regulator/driver.h>
  31 #include <linux/regulator/machine.h>
  32 #include <linux/mfd/max8997.h>
  33 #include <linux/mfd/max8997-private.h>
  34
  35 struct max8997_data {
  36         struct device *dev;
  37         struct max8997_dev *iodev;
  38         int num_regulators;
  39         struct regulator_dev **rdev;
  40         int ramp_delay; /* in mV/us */
  41
  42         bool buck1_gpiodvs;
  43         bool buck2_gpiodvs;
  44         bool buck5_gpiodvs;
  45         u8 buck1_vol[8];
  46         u8 buck2_vol[8];
  47         u8 buck5_vol[8];
  48         int buck125_gpios[3];
  49         int buck125_gpioindex;
  50         bool ignore_gpiodvs_side_effect;
  51
  52         u8 saved_states[MAX8997_REG_MAX];
  53 };
  54
  55 static inline void max8997_set_gpio(struct max8997_data *max8997)
  56 {
  57         int set3 = (max8997->buck125_gpioindex) & 0x1;
  58         int set2 = ((max8997->buck125_gpioindex) >> 1) & 0x1;
  59         int set1 = ((max8997->buck125_gpioindex) >> 2) & 0x1;
  60
  61         gpio_set_value(max8997->buck125_gpios[0], set1);
  62         gpio_set_value(max8997->buck125_gpios[1], set2);
  63         gpio_set_value(max8997->buck125_gpios[2], set3);
  64 }
  65
  66 struct voltage_map_desc {
  67         int min;
  68         int max;
  69         int step;
  70 };
  71
  72 /* Voltage maps in mV */
  73 static const struct voltage_map_desc ldo_voltage_map_desc = {
  74         .min = 800,     .max = 3950,    .step = 50,
  75 }; /* LDO1 ~ 18, 21 all */
  76
  77 static const struct voltage_map_desc buck1245_voltage_map_desc = {
  78         .min = 650,     .max = 2225,    .step = 25,
  79 }; /* Buck1, 2, 4, 5 */
  80
  81 static const struct voltage_map_desc buck37_voltage_map_desc = {
  82         .min = 750,     .max = 3900,    .step = 50,
  83 }; /* Buck3, 7 */
  84
  85 /* current map in mA */
  86 static const struct voltage_map_desc charger_current_map_desc = {
  87         .min = 200,     .max = 950,     .step = 50,
  88 };
  89
  90 static const struct voltage_map_desc topoff_current_map_desc = {
  91         .min = 50,      .max = 200,     .step = 10,
  92 };
  93
  94 static const struct voltage_map_desc *reg_voltage_map[] = {
  95         [MAX8997_LDO1] = &ldo_voltage_map_desc,
  96         [MAX8997_LDO2] = &ldo_voltage_map_desc,
  97         [MAX8997_LDO3] = &ldo_voltage_map_desc,
  98         [MAX8997_LDO4] = &ldo_voltage_map_desc,
  99         [MAX8997_LDO5] = &ldo_voltage_map_desc,
 100         [MAX8997_LDO6] = &ldo_voltage_map_desc,
 101         [MAX8997_LDO7] = &ldo_voltage_map_desc,
 102         [MAX8997_LDO8] = &ldo_voltage_map_desc,
 103         [MAX8997_LDO9] = &ldo_voltage_map_desc,
 104         [MAX8997_LDO10] = &ldo_voltage_map_desc,
 105         [MAX8997_LDO11] = &ldo_voltage_map_desc,
 106         [MAX8997_LDO12] = &ldo_voltage_map_desc,
 107         [MAX8997_LDO13] = &ldo_voltage_map_desc,
 108         [MAX8997_LDO14] = &ldo_voltage_map_desc,
 109         [MAX8997_LDO15] = &ldo_voltage_map_desc,
 110         [MAX8997_LDO16] = &ldo_voltage_map_desc,
 111         [MAX8997_LDO17] = &ldo_voltage_map_desc,
 112         [MAX8997_LDO18] = &ldo_voltage_map_desc,
 113         [MAX8997_LDO21] = &ldo_voltage_map_desc,
 114         [MAX8997_BUCK1] = &buck1245_voltage_map_desc,
 115         [MAX8997_BUCK2] = &buck1245_voltage_map_desc,
 116         [MAX8997_BUCK3] = &buck37_voltage_map_desc,
 117         [MAX8997_BUCK4] = &buck1245_voltage_map_desc,
 118         [MAX8997_BUCK5] = &buck1245_voltage_map_desc,
 119         [MAX8997_BUCK6] = NULL,
 120         [MAX8997_BUCK7] = &buck37_voltage_map_desc,
 121         [MAX8997_EN32KHZ_AP] = NULL,
 122         [MAX8997_EN32KHZ_CP] = NULL,
 123         [MAX8997_ENVICHG] = NULL,
 124         [MAX8997_ESAFEOUT1] = NULL,
 125         [MAX8997_ESAFEOUT2] = NULL,
 126         [MAX8997_CHARGER_CV] = NULL,
 127         [MAX8997_CHARGER] = &charger_current_map_desc,
 128         [MAX8997_CHARGER_TOPOFF] = &topoff_current_map_desc,
 129 };
 130
 131 static int max8997_list_voltage_safeout(struct regulator_dev *rdev,
 132                 unsigned int selector)
 133 {
 134         int rid = rdev_get_id(rdev);
 135
 136         if (rid == MAX8997_ESAFEOUT1 || rid == MAX8997_ESAFEOUT2) {
 137                 switch (selector) {
 138                 case 0:
 139                         return 4850000;
 140                 case 1:
 141                         return 4900000;
 142                 case 2:
 143                         return 4950000;
 144                 case 3:
 145                         return 3300000;
 146                 default:
 147                         return -EINVAL;
 148                 }
 149         }
 150
 151         return -EINVAL;
 152 }
 153
 154 static int max8997_list_voltage_charger_cv(struct regulator_dev *rdev,
 155                 unsigned int selector)
 156 {
 157         int rid = rdev_get_id(rdev);
 158
 159         if (rid != MAX8997_CHARGER_CV)
 160                 goto err;
 161
 162         switch (selector) {
 163         case 0x00:
 164                 return 4200000;
 165         case 0x01 ... 0x0E:
 166                 return 4000000 + 20000 * (selector - 0x01);
 167         case 0x0F:
 168                 return 4350000;
 169         default:
 170                 return -EINVAL;
 171         }
 172 err:
 173         return -EINVAL;
 174 }
 175
 176 static int max8997_list_voltage(struct regulator_dev *rdev,
 177                 unsigned int selector)
 178 {
 179         const struct voltage_map_desc *desc;
 180         int rid = rdev_get_id(rdev);
 181         int val;
 182
 183         if (rid >= ARRAY_SIZE(reg_voltage_map) ||
 184                         rid < 0)
 185                 return -EINVAL;
 186
 187         desc = reg_voltage_map[rid];
 188         if (desc == NULL)
 189                 return -EINVAL;
 190
 191         val = desc->min + desc->step * selector;
 192         if (val > desc->max)
 193                 return -EINVAL;
 194
 195         return val * 1000;
 196 }
 197
 198 static int max8997_get_enable_register(struct regulator_dev *rdev,
 199                 int *reg, int *mask, int *pattern)
 200 {
 201         int rid = rdev_get_id(rdev);
 202
 203         switch (rid) {
 204         case MAX8997_LDO1 ... MAX8997_LDO21:
 205                 *reg = MAX8997_REG_LDO1CTRL + (rid - MAX8997_LDO1);
 206                 *mask = 0xC0;
 207                 *pattern = 0xC0;
 208                 break;
 209         case MAX8997_BUCK1:
 210                 *reg = MAX8997_REG_BUCK1CTRL;
 211                 *mask = 0x01;
 212                 *pattern = 0x01;
 213                 break;
 214         case MAX8997_BUCK2:
 215                 *reg = MAX8997_REG_BUCK2CTRL;
 216                 *mask = 0x01;
 217                 *pattern = 0x01;
 218                 break;
 219         case MAX8997_BUCK3:
 220                 *reg = MAX8997_REG_BUCK3CTRL;
 221                 *mask = 0x01;
 222                 *pattern = 0x01;
 223                 break;
 224         case MAX8997_BUCK4:
 225                 *reg = MAX8997_REG_BUCK4CTRL;
 226                 *mask = 0x01;
 227                 *pattern = 0x01;
 228                 break;
 229         case MAX8997_BUCK5:
 230                 *reg = MAX8997_REG_BUCK5CTRL;
 231                 *mask = 0x01;
 232                 *pattern = 0x01;
 233                 break;
 234         case MAX8997_BUCK6:
 235                 *reg = MAX8997_REG_BUCK6CTRL;
 236                 *mask = 0x01;
 237                 *pattern = 0x01;
 238                 break;
 239         case MAX8997_BUCK7:
 240                 *reg = MAX8997_REG_BUCK7CTRL;
 241                 *mask = 0x01;
 242                 *pattern = 0x01;
 243                 break;
 244         case MAX8997_EN32KHZ_AP ... MAX8997_EN32KHZ_CP:
 245                 *reg = MAX8997_REG_MAINCON1;
 246                 *mask = 0x01 << (rid - MAX8997_EN32KHZ_AP);
 247                 *pattern = 0x01 << (rid - MAX8997_EN32KHZ_AP);
 248                 break;
 249         case MAX8997_ENVICHG:
 250                 *reg = MAX8997_REG_MBCCTRL1;
 251                 *mask = 0x80;
 252                 *pattern = 0x80;
 253                 break;
 254         case MAX8997_ESAFEOUT1 ... MAX8997_ESAFEOUT2:
 255                 *reg = MAX8997_REG_SAFEOUTCTRL;
 256                 *mask = 0x40 << (rid - MAX8997_ESAFEOUT1);
 257                 *pattern = 0x40 << (rid - MAX8997_ESAFEOUT1);
 258                 break;
 259         case MAX8997_CHARGER:
 260                 *reg = MAX8997_REG_MBCCTRL2;
 261                 *mask = 0x40;
 262                 *pattern = 0x40;
 263                 break;
 264         default:
 265                 /* Not controllable or not exists */
 266                 return -EINVAL;
 267         }
 268
 269         return 0;
 270 }
 271
 272 static int max8997_reg_is_enabled(struct regulator_dev *rdev)
 273 {
 274         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 275         struct i2c_client *i2c = max8997->iodev->i2c;
 276         int ret, reg, mask, pattern;
 277         u8 val;
 278
 279         ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
 280         if (ret)
 281                 return ret;
 282
 283         ret = max8997_read_reg(i2c, reg, &val);
 284         if (ret)
 285                 return ret;
 286
 287         return (val & mask) == pattern;
 288 }
 289
 290 static int max8997_reg_enable(struct regulator_dev *rdev)
 291 {
 292         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 293         struct i2c_client *i2c = max8997->iodev->i2c;
 294         int ret, reg, mask, pattern;
 295
 296         ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
 297         if (ret)
 298                 return ret;
 299
 300         return max8997_update_reg(i2c, reg, pattern, mask);
 301 }
 302
 303 static int max8997_reg_disable(struct regulator_dev *rdev)
 304 {
 305         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 306         struct i2c_client *i2c = max8997->iodev->i2c;
 307         int ret, reg, mask, pattern;
 308
 309         ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
 310         if (ret)
 311                 return ret;
 312
 313         return max8997_update_reg(i2c, reg, ~pattern, mask);
 314 }
 315
 316 static int max8997_get_voltage_register(struct regulator_dev *rdev,
 317                 int *_reg, int *_shift, int *_mask)
 318 {
 319         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 320         int rid = rdev_get_id(rdev);
 321         int reg, shift = 0, mask = 0x3f;
 322
 323         switch (rid) {
 324         case MAX8997_LDO1 ... MAX8997_LDO21:
 325                 reg = MAX8997_REG_LDO1CTRL + (rid - MAX8997_LDO1);
 326                 break;
 327         case MAX8997_BUCK1:
 328                 reg = MAX8997_REG_BUCK1DVS1;
 329                 if (max8997->buck1_gpiodvs)
 330                         reg += max8997->buck125_gpioindex;
 331                 break;
 332         case MAX8997_BUCK2:
 333                 reg = MAX8997_REG_BUCK2DVS1;
 334                 if (max8997->buck2_gpiodvs)
 335                         reg += max8997->buck125_gpioindex;
 336                 break;
 337         case MAX8997_BUCK3:
 338                 reg = MAX8997_REG_BUCK3DVS;
 339                 break;
 340         case MAX8997_BUCK4:
 341                 reg = MAX8997_REG_BUCK4DVS;
 342                 break;
 343         case MAX8997_BUCK5:
 344                 reg = MAX8997_REG_BUCK5DVS1;
 345                 if (max8997->buck5_gpiodvs)
 346                         reg += max8997->buck125_gpioindex;
 347                 break;
 348         case MAX8997_BUCK7:
 349                 reg = MAX8997_REG_BUCK7DVS;
 350                 break;
 351         case MAX8997_ESAFEOUT1 ...  MAX8997_ESAFEOUT2:
 352                 reg = MAX8997_REG_SAFEOUTCTRL;
 353                 shift = (rid == MAX8997_ESAFEOUT2) ? 2 : 0;
 354                 mask = 0x3;
 355                 break;
 356         case MAX8997_CHARGER_CV:
 357                 reg = MAX8997_REG_MBCCTRL3;
 358                 shift = 0;
 359                 mask = 0xf;
 360                 break;
 361         case MAX8997_CHARGER:
 362                 reg = MAX8997_REG_MBCCTRL4;
 363                 shift = 0;
 364                 mask = 0xf;
 365                 break;
 366         case MAX8997_CHARGER_TOPOFF:
 367                 reg = MAX8997_REG_MBCCTRL5;
 368                 shift = 0;
 369                 mask = 0xf;
 370                 break;
 371         default:
 372                 return -EINVAL;
 373         }
 374
 375         *_reg = reg;
 376         *_shift = shift;
 377         *_mask = mask;
 378
 379         return 0;
 380 }
 381
 382 static int max8997_get_voltage_sel(struct regulator_dev *rdev)
 383 {
 384         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 385         struct i2c_client *i2c = max8997->iodev->i2c;
 386         int reg, shift, mask, ret;
 387         u8 val;
 388
 389         ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
 390         if (ret)
 391                 return ret;
 392
 393         ret = max8997_read_reg(i2c, reg, &val);
 394         if (ret)
 395                 return ret;
 396
 397         val >>= shift;
 398         val &= mask;
 399
 400         return val;
 401 }
 402
 403 static inline int max8997_get_voltage_proper_val(
 404                 const struct voltage_map_desc *desc,
 405                 int min_vol, int max_vol)
 406 {
 407         int i;
 408
 409         if (desc == NULL)
 410                 return -EINVAL;
 411
 412         if (max_vol < desc->min || min_vol > desc->max)
 413                 return -EINVAL;
 414
 415         if (min_vol < desc->min)
 416                 min_vol = desc->min;
 417
 418         i = DIV_ROUND_UP(min_vol - desc->min, desc->step);
 419
 420         if (desc->min + desc->step * i > max_vol)
 421                 return -EINVAL;
 422
 423         return i;
 424 }
 425
 426 static int max8997_set_voltage_charger_cv(struct regulator_dev *rdev,
 427                 int min_uV, int max_uV, unsigned *selector)
 428 {
 429         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 430         struct i2c_client *i2c = max8997->iodev->i2c;
 431         int rid = rdev_get_id(rdev);
 432         int lb, ub;
 433         int reg, shift = 0, mask, ret = 0;
 434         u8 val = 0x0;
 435
 436         if (rid != MAX8997_CHARGER_CV)
 437                 return -EINVAL;
 438
 439         ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
 440         if (ret)
 441                 return ret;
 442
 443         if (max_uV < 4000000 || min_uV > 4350000)
 444                 return -EINVAL;
 445
 446         if (min_uV <= 4000000) {
 447                 if (max_uV >= 4000000)
 448                         return -EINVAL;
 449                 else
 450                         val = 0x1;
 451         } else if (min_uV <= 4200000 && max_uV >= 4200000)
 452                 val = 0x0;
 453         else {
 454                 lb = (min_uV - 4000001) / 20000 + 2;
 455                 ub = (max_uV - 4000000) / 20000 + 1;
 456
 457                 if (lb > ub)
 458                         return -EINVAL;
 459
 460                 if (lb < 0xf)
 461                         val = lb;
 462                 else {
 463                         if (ub >= 0xf)
 464                                 val = 0xf;
 465                         else
 466                                 return -EINVAL;
 467                 }
 468         }
 469
 470         *selector = val;
 471
 472         ret = max8997_update_reg(i2c, reg, val << shift, mask);
 473
 474         return ret;
 475 }
 476
 477 /*
 478  * For LDO1 ~ LDO21, BUCK1~5, BUCK7, CHARGER, CHARGER_TOPOFF
 479  * BUCK1, 2, and 5 are available if they are not controlled by gpio
 480  */
 481 static int max8997_set_voltage_ldobuck(struct regulator_dev *rdev,
 482                 int min_uV, int max_uV, unsigned *selector)
 483 {
 484         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 485         struct i2c_client *i2c = max8997->iodev->i2c;
 486         int min_vol = min_uV / 1000, max_vol = max_uV / 1000;
 487         const struct voltage_map_desc *desc;
 488         int rid = rdev_get_id(rdev);
 489         int i, reg, shift, mask, ret;
 490
 491         switch (rid) {
 492         case MAX8997_LDO1 ... MAX8997_LDO21:
 493                 break;
 494         case MAX8997_BUCK1 ... MAX8997_BUCK5:
 495                 break;
 496         case MAX8997_BUCK6:
 497                 return -EINVAL;
 498         case MAX8997_BUCK7:
 499                 break;
 500         case MAX8997_CHARGER:
 501                 break;
 502         case MAX8997_CHARGER_TOPOFF:
 503                 break;
 504         default:
 505                 return -EINVAL;
 506         }
 507
 508         desc = reg_voltage_map[rid];
 509
 510         i = max8997_get_voltage_proper_val(desc, min_vol, max_vol);
 511         if (i < 0)
 512                 return i;
 513
 514         ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
 515         if (ret)
 516                 return ret;
 517
 518         ret = max8997_update_reg(i2c, reg, i << shift, mask << shift);
 519         *selector = i;
 520
 521         return ret;
 522 }
 523
 524 static int max8997_set_voltage_ldobuck_time_sel(struct regulator_dev *rdev,
 525                                                 unsigned int old_selector,
 526                                                 unsigned int new_selector)
 527 {
 528         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 529         int rid = rdev_get_id(rdev);
 530         const struct voltage_map_desc *desc = reg_voltage_map[rid];
 531
 532         /* Delay is required only if the voltage is increasing */
 533         if (old_selector >= new_selector)
 534                 return 0;
 535
 536         /* No need to delay if gpio_dvs_mode */
 537         switch (rid) {
 538         case MAX8997_BUCK1:
 539                 if (max8997->buck1_gpiodvs)
 540                         return 0;
 541                 break;
 542         case MAX8997_BUCK2:
 543                 if (max8997->buck2_gpiodvs)
 544                         return 0;
 545                 break;
 546         case MAX8997_BUCK5:
 547                 if (max8997->buck5_gpiodvs)
 548                         return 0;
 549                 break;
 550         }
 551
 552         switch (rid) {
 553         case MAX8997_BUCK1:
 554         case MAX8997_BUCK2:
 555         case MAX8997_BUCK4:
 556         case MAX8997_BUCK5:
 557                 return DIV_ROUND_UP(desc->step * (new_selector - old_selector),
 558                                     max8997->ramp_delay);
 559         }
 560
 561         return 0;
 562 }
 563
 564 /*
 565  * Assess the damage on the voltage setting of BUCK1,2,5 by the change.
 566  *
 567  * When GPIO-DVS mode is used for multiple bucks, changing the voltage value
 568  * of one of the bucks may affect that of another buck, which is the side
 569  * effect of the change (set_voltage). This function examines the GPIO-DVS
 570  * configurations and checks whether such side-effect exists.
 571  */
 572 static int max8997_assess_side_effect(struct regulator_dev *rdev,
 573                 u8 new_val, int *best)
 574 {
 575         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 576         int rid = rdev_get_id(rdev);
 577         u8 *buckx_val[3];
 578         bool buckx_gpiodvs[3];
 579         int side_effect[8];
 580         int min_side_effect = INT_MAX;
 581         int i;
 582
 583         *best = -1;
 584
 585         switch (rid) {
 586         case MAX8997_BUCK1:
 587                 rid = 0;
 588                 break;
 589         case MAX8997_BUCK2:
 590                 rid = 1;
 591                 break;
 592         case MAX8997_BUCK5:
 593                 rid = 2;
 594                 break;
 595         default:
 596                 return -EINVAL;
 597         }
 598
 599         buckx_val[0] = max8997->buck1_vol;
 600         buckx_val[1] = max8997->buck2_vol;
 601         buckx_val[2] = max8997->buck5_vol;
 602         buckx_gpiodvs[0] = max8997->buck1_gpiodvs;
 603         buckx_gpiodvs[1] = max8997->buck2_gpiodvs;
 604         buckx_gpiodvs[2] = max8997->buck5_gpiodvs;
 605
 606         for (i = 0; i < 8; i++) {
 607                 int others;
 608
 609                 if (new_val != (buckx_val[rid])[i]) {
 610                         side_effect[i] = -1;
 611                         continue;
 612                 }
 613
 614                 side_effect[i] = 0;
 615                 for (others = 0; others < 3; others++) {
 616                         int diff;
 617
 618                         if (others == rid)
 619                                 continue;
 620                         if (buckx_gpiodvs[others] == false)
 621                                 continue; /* Not affected */
 622                         diff = (buckx_val[others])[i] -
 623                                 (buckx_val[others])[max8997->buck125_gpioindex];
 624                         if (diff > 0)
 625                                 side_effect[i] += diff;
 626                         else if (diff < 0)
 627                                 side_effect[i] -= diff;
 628                 }
 629                 if (side_effect[i] == 0) {
 630                         *best = i;
 631                         return 0; /* NO SIDE EFFECT! Use This! */
 632                 }
 633                 if (side_effect[i] < min_side_effect) {
 634                         min_side_effect = side_effect[i];
 635                         *best = i;
 636                 }
 637         }
 638
 639         if (*best == -1)
 640                 return -EINVAL;
 641
 642         return side_effect[*best];
 643 }
 644
 645 /*
 646  * For Buck 1 ~ 5 and 7. If it is not controlled by GPIO, this calls
 647  * max8997_set_voltage_ldobuck to do the job.
 648  */
 649 static int max8997_set_voltage_buck(struct regulator_dev *rdev,
 650                 int min_uV, int max_uV, unsigned *selector)
 651 {
 652         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 653         int rid = rdev_get_id(rdev);
 654         const struct voltage_map_desc *desc;
 655         int new_val, new_idx, damage, tmp_val, tmp_idx, tmp_dmg;
 656         bool gpio_dvs_mode = false;
 657         int min_vol = min_uV / 1000, max_vol = max_uV / 1000;
 658
 659         if (rid < MAX8997_BUCK1 || rid > MAX8997_BUCK7)
 660                 return -EINVAL;
 661
 662         switch (rid) {
 663         case MAX8997_BUCK1:
 664                 if (max8997->buck1_gpiodvs)
 665                         gpio_dvs_mode = true;
 666                 break;
 667         case MAX8997_BUCK2:
 668                 if (max8997->buck2_gpiodvs)
 669                         gpio_dvs_mode = true;
 670                 break;
 671         case MAX8997_BUCK5:
 672                 if (max8997->buck5_gpiodvs)
 673                         gpio_dvs_mode = true;
 674                 break;
 675         }
 676
 677         if (!gpio_dvs_mode)
 678                 return max8997_set_voltage_ldobuck(rdev, min_uV, max_uV,
 679                                                 selector);
 680
 681         desc = reg_voltage_map[rid];
 682         new_val = max8997_get_voltage_proper_val(desc, min_vol, max_vol);
 683         if (new_val < 0)
 684                 return new_val;
 685
 686         tmp_dmg = INT_MAX;
 687         tmp_idx = -1;
 688         tmp_val = -1;
 689         do {
 690                 damage = max8997_assess_side_effect(rdev, new_val, &new_idx);
 691                 if (damage == 0)
 692                         goto out;
 693
 694                 if (tmp_dmg > damage) {
 695                         tmp_idx = new_idx;
 696                         tmp_val = new_val;
 697                         tmp_dmg = damage;
 698                 }
 699
 700                 new_val++;
 701         } while (desc->min + desc->step * new_val <= desc->max);
 702
 703         new_idx = tmp_idx;
 704         new_val = tmp_val;
 705
 706         if (max8997->ignore_gpiodvs_side_effect == false)
 707                 return -EINVAL;
 708
 709         dev_warn(&rdev->dev, "MAX8997 GPIO-DVS Side Effect Warning: GPIO SET:"
 710                         " %d -> %d\n", max8997->buck125_gpioindex, tmp_idx);
 711
 712 out:
 713         if (new_idx < 0 || new_val < 0)
 714                 return -EINVAL;
 715
 716         max8997->buck125_gpioindex = new_idx;
 717         max8997_set_gpio(max8997);
 718         *selector = new_val;
 719
 720         return 0;
 721 }
 722
 723 static const int safeoutvolt[] = {
 724         3300000,
 725         4850000,
 726         4900000,
 727         4950000,
 728 };
 729
 730 /* For SAFEOUT1 and SAFEOUT2 */
 731 static int max8997_set_voltage_safeout(struct regulator_dev *rdev,
 732                 int min_uV, int max_uV, unsigned *selector)
 733 {
 734         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 735         struct i2c_client *i2c = max8997->iodev->i2c;
 736         int rid = rdev_get_id(rdev);
 737         int reg, shift = 0, mask, ret;
 738         int i = 0;
 739         u8 val;
 740
 741         if (rid != MAX8997_ESAFEOUT1 && rid != MAX8997_ESAFEOUT2)
 742                 return -EINVAL;
 743
 744         for (i = 0; i < ARRAY_SIZE(safeoutvolt); i++) {
 745                 if (min_uV <= safeoutvolt[i] &&
 746                                 max_uV >= safeoutvolt[i])
 747                         break;
 748         }
 749
 750         if (i >= ARRAY_SIZE(safeoutvolt))
 751                 return -EINVAL;
 752
 753         if (i == 0)
 754                 val = 0x3;
 755         else
 756                 val = i - 1;
 757
 758         ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
 759         if (ret)
 760                 return ret;
 761
 762         ret = max8997_update_reg(i2c, reg, val << shift, mask << shift);
 763         *selector = val;
 764
 765         return ret;
 766 }
 767
 768 static int max8997_reg_disable_suspend(struct regulator_dev *rdev)
 769 {
 770         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 771         struct i2c_client *i2c = max8997->iodev->i2c;
 772         int ret, reg, mask, pattern;
 773         int rid = rdev_get_id(rdev);
 774
 775         ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
 776         if (ret)
 777                 return ret;
 778
 779         max8997_read_reg(i2c, reg, &max8997->saved_states[rid]);
 780
 781         if (rid == MAX8997_LDO1 ||
 782                         rid == MAX8997_LDO10 ||
 783                         rid == MAX8997_LDO21) {
 784                 dev_dbg(&rdev->dev, "Conditional Power-Off for %s\n",
 785                                 rdev->desc->name);
 786                 return max8997_update_reg(i2c, reg, 0x40, mask);
 787         }
 788
 789         dev_dbg(&rdev->dev, "Full Power-Off for %s (%xh -> %xh)\n",
 790                         rdev->desc->name, max8997->saved_states[rid] & mask,
 791                         (~pattern) & mask);
 792         return max8997_update_reg(i2c, reg, ~pattern, mask);
 793 }
 794
 795 static struct regulator_ops max8997_ldo_ops = {
 796         .list_voltage           = max8997_list_voltage,
 797         .is_enabled             = max8997_reg_is_enabled,
 798         .enable                 = max8997_reg_enable,
 799         .disable                = max8997_reg_disable,
 800         .get_voltage_sel        = max8997_get_voltage_sel,
 801         .set_voltage            = max8997_set_voltage_ldobuck,
 802         .set_voltage_time_sel   = max8997_set_voltage_ldobuck_time_sel,
 803         .set_suspend_disable    = max8997_reg_disable_suspend,
 804 };
 805
 806 static struct regulator_ops max8997_buck_ops = {
 807         .list_voltage           = max8997_list_voltage,
 808         .is_enabled             = max8997_reg_is_enabled,
 809         .enable                 = max8997_reg_enable,
 810         .disable                = max8997_reg_disable,
 811         .get_voltage_sel        = max8997_get_voltage_sel,
 812         .set_voltage            = max8997_set_voltage_buck,
 813         .set_voltage_time_sel   = max8997_set_voltage_ldobuck_time_sel,
 814         .set_suspend_disable    = max8997_reg_disable_suspend,
 815 };
 816
 817 static struct regulator_ops max8997_fixedvolt_ops = {
 818         .list_voltage           = max8997_list_voltage,
 819         .is_enabled             = max8997_reg_is_enabled,
 820         .enable                 = max8997_reg_enable,
 821         .disable                = max8997_reg_disable,
 822         .set_suspend_disable    = max8997_reg_disable_suspend,
 823 };
 824
 825 static struct regulator_ops max8997_safeout_ops = {
 826         .list_voltage           = max8997_list_voltage_safeout,
 827         .is_enabled             = max8997_reg_is_enabled,
 828         .enable                 = max8997_reg_enable,
 829         .disable                = max8997_reg_disable,
 830         .get_voltage_sel        = max8997_get_voltage_sel,
 831         .set_voltage            = max8997_set_voltage_safeout,
 832         .set_suspend_disable    = max8997_reg_disable_suspend,
 833 };
 834
 835 static struct regulator_ops max8997_fixedstate_ops = {
 836         .list_voltage           = max8997_list_voltage_charger_cv,
 837         .get_voltage_sel        = max8997_get_voltage_sel,
 838         .set_voltage            = max8997_set_voltage_charger_cv,
 839 };
 840
 841 static int max8997_set_current_limit(struct regulator_dev *rdev,
 842                                      int min_uA, int max_uA)
 843 {
 844         unsigned dummy;
 845         int rid = rdev_get_id(rdev);
 846
 847         if (rid != MAX8997_CHARGER && rid != MAX8997_CHARGER_TOPOFF)
 848                 return -EINVAL;
 849
 850         /* Reuse max8997_set_voltage_ldobuck to set current_limit. */
 851         return max8997_set_voltage_ldobuck(rdev, min_uA, max_uA, &dummy);
 852 }
 853
 854 static int max8997_get_current_limit(struct regulator_dev *rdev)
 855 {
 856         int sel, rid = rdev_get_id(rdev);
 857
 858         if (rid != MAX8997_CHARGER && rid != MAX8997_CHARGER_TOPOFF)
 859                 return -EINVAL;
 860
 861         sel = max8997_get_voltage_sel(rdev);
 862         if (sel < 0)
 863                 return sel;
 864
 865         /* Reuse max8997_list_voltage to get current_limit. */
 866         return max8997_list_voltage(rdev, sel);
 867 }
 868
 869 static struct regulator_ops max8997_charger_ops = {
 870         .is_enabled             = max8997_reg_is_enabled,
 871         .enable                 = max8997_reg_enable,
 872         .disable                = max8997_reg_disable,
 873         .get_current_limit      = max8997_get_current_limit,
 874         .set_current_limit      = max8997_set_current_limit,
 875 };
 876
 877 static struct regulator_ops max8997_charger_fixedstate_ops = {
 878         .get_current_limit      = max8997_get_current_limit,
 879         .set_current_limit      = max8997_set_current_limit,
 880 };
 881
 882 #define MAX8997_VOLTAGE_REGULATOR(_name, _ops) {\
 883         .name           = #_name,               \
 884         .id             = MAX8997_##_name,      \
 885         .ops            = &_ops,                \
 886         .type           = REGULATOR_VOLTAGE,    \
 887         .owner          = THIS_MODULE,          \
 888 }
 889
 890 #define MAX8997_CURRENT_REGULATOR(_name, _ops) {\
 891         .name           = #_name,               \
 892         .id             = MAX8997_##_name,      \
 893         .ops            = &_ops,                \
 894         .type           = REGULATOR_CURRENT,    \
 895         .owner          = THIS_MODULE,          \
 896 }
 897
 898 static struct regulator_desc regulators[] = {
 899         MAX8997_VOLTAGE_REGULATOR(LDO1, max8997_ldo_ops),
 900         MAX8997_VOLTAGE_REGULATOR(LDO2, max8997_ldo_ops),
 901         MAX8997_VOLTAGE_REGULATOR(LDO3, max8997_ldo_ops),
 902         MAX8997_VOLTAGE_REGULATOR(LDO4, max8997_ldo_ops),
 903         MAX8997_VOLTAGE_REGULATOR(LDO5, max8997_ldo_ops),
 904         MAX8997_VOLTAGE_REGULATOR(LDO6, max8997_ldo_ops),
 905         MAX8997_VOLTAGE_REGULATOR(LDO7, max8997_ldo_ops),
 906         MAX8997_VOLTAGE_REGULATOR(LDO8, max8997_ldo_ops),
 907         MAX8997_VOLTAGE_REGULATOR(LDO9, max8997_ldo_ops),
 908         MAX8997_VOLTAGE_REGULATOR(LDO10, max8997_ldo_ops),
 909         MAX8997_VOLTAGE_REGULATOR(LDO11, max8997_ldo_ops),
 910         MAX8997_VOLTAGE_REGULATOR(LDO12, max8997_ldo_ops),
 911         MAX8997_VOLTAGE_REGULATOR(LDO13, max8997_ldo_ops),
 912         MAX8997_VOLTAGE_REGULATOR(LDO14, max8997_ldo_ops),
 913         MAX8997_VOLTAGE_REGULATOR(LDO15, max8997_ldo_ops),
 914         MAX8997_VOLTAGE_REGULATOR(LDO16, max8997_ldo_ops),
 915         MAX8997_VOLTAGE_REGULATOR(LDO17, max8997_ldo_ops),
 916         MAX8997_VOLTAGE_REGULATOR(LDO18, max8997_ldo_ops),
 917         MAX8997_VOLTAGE_REGULATOR(LDO21, max8997_ldo_ops),
 918         MAX8997_VOLTAGE_REGULATOR(BUCK1, max8997_buck_ops),
 919         MAX8997_VOLTAGE_REGULATOR(BUCK2, max8997_buck_ops),
 920         MAX8997_VOLTAGE_REGULATOR(BUCK3, max8997_buck_ops),
 921         MAX8997_VOLTAGE_REGULATOR(BUCK4, max8997_buck_ops),
 922         MAX8997_VOLTAGE_REGULATOR(BUCK5, max8997_buck_ops),
 923         MAX8997_VOLTAGE_REGULATOR(BUCK6, max8997_fixedvolt_ops),
 924         MAX8997_VOLTAGE_REGULATOR(BUCK7, max8997_buck_ops),
 925         MAX8997_VOLTAGE_REGULATOR(EN32KHZ_AP, max8997_fixedvolt_ops),
 926         MAX8997_VOLTAGE_REGULATOR(EN32KHZ_CP, max8997_fixedvolt_ops),
 927         MAX8997_VOLTAGE_REGULATOR(ENVICHG, max8997_fixedvolt_ops),
 928         MAX8997_VOLTAGE_REGULATOR(ESAFEOUT1, max8997_safeout_ops),
 929         MAX8997_VOLTAGE_REGULATOR(ESAFEOUT2, max8997_safeout_ops),
 930         MAX8997_VOLTAGE_REGULATOR(CHARGER_CV, max8997_fixedstate_ops),
 931         MAX8997_CURRENT_REGULATOR(CHARGER, max8997_charger_ops),
 932         MAX8997_CURRENT_REGULATOR(CHARGER_TOPOFF,
 933                                   max8997_charger_fixedstate_ops),
 934 };
 935
 936 static __devinit int max8997_pmic_probe(struct platform_device *pdev)
 937 {
 938         struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 939         struct max8997_platform_data *pdata = dev_get_platdata(iodev->dev);
 940         struct regulator_config config = { };
 941         struct regulator_dev **rdev;
 942         struct max8997_data *max8997;
 943         struct i2c_client *i2c;
 944         int i, ret, size;
 945         u8 max_buck1 = 0, max_buck2 = 0, max_buck5 = 0;
 946
 947         if (!pdata) {
 948                 dev_err(pdev->dev.parent, "No platform init data supplied.\n");
 949                 return -ENODEV;
 950         }
 951
 952         max8997 = devm_kzalloc(&pdev->dev, sizeof(struct max8997_data),
 953                                GFP_KERNEL);
 954         if (!max8997)
 955                 return -ENOMEM;
 956
 957         size = sizeof(struct regulator_dev *) * pdata->num_regulators;
 958         max8997->rdev = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
 959         if (!max8997->rdev)
 960                 return -ENOMEM;
 961
 962         rdev = max8997->rdev;
 963         max8997->dev = &pdev->dev;
 964         max8997->iodev = iodev;
 965         max8997->num_regulators = pdata->num_regulators;
 966         platform_set_drvdata(pdev, max8997);
 967         i2c = max8997->iodev->i2c;
 968
 969         max8997->buck125_gpioindex = pdata->buck125_default_idx;
 970         max8997->buck1_gpiodvs = pdata->buck1_gpiodvs;
 971         max8997->buck2_gpiodvs = pdata->buck2_gpiodvs;
 972         max8997->buck5_gpiodvs = pdata->buck5_gpiodvs;
 973         memcpy(max8997->buck125_gpios, pdata->buck125_gpios, sizeof(int) * 3);
 974         max8997->ignore_gpiodvs_side_effect = pdata->ignore_gpiodvs_side_effect;
 975
 976         for (i = 0; i < 8; i++) {
 977                 max8997->buck1_vol[i] = ret =
 978                         max8997_get_voltage_proper_val(
 979                                         &buck1245_voltage_map_desc,
 980                                         pdata->buck1_voltage[i] / 1000,
 981                                         pdata->buck1_voltage[i] / 1000 +
 982                                         buck1245_voltage_map_desc.step);
 983                 if (ret < 0)
 984                         goto err_out;
 985
 986                 max8997->buck2_vol[i] = ret =
 987                         max8997_get_voltage_proper_val(
 988                                         &buck1245_voltage_map_desc,
 989                                         pdata->buck2_voltage[i] / 1000,
 990                                         pdata->buck2_voltage[i] / 1000 +
 991                                         buck1245_voltage_map_desc.step);
 992                 if (ret < 0)
 993                         goto err_out;
 994
 995                 max8997->buck5_vol[i] = ret =
 996                         max8997_get_voltage_proper_val(
 997                                         &buck1245_voltage_map_desc,
 998                                         pdata->buck5_voltage[i] / 1000,
 999                                         pdata->buck5_voltage[i] / 1000 +
1000                                         buck1245_voltage_map_desc.step);
1001                 if (ret < 0)
1002                         goto err_out;
1003
1004                 if (max_buck1 < max8997->buck1_vol[i])
1005                         max_buck1 = max8997->buck1_vol[i];
1006                 if (max_buck2 < max8997->buck2_vol[i])
1007                         max_buck2 = max8997->buck2_vol[i];
1008                 if (max_buck5 < max8997->buck5_vol[i])
1009                         max_buck5 = max8997->buck5_vol[i];
1010         }
1011
1012         /* For the safety, set max voltage before setting up */
1013         for (i = 0; i < 8; i++) {
1014                 max8997_update_reg(i2c, MAX8997_REG_BUCK1DVS1 + i,
1015                                 max_buck1, 0x3f);
1016                 max8997_update_reg(i2c, MAX8997_REG_BUCK2DVS1 + i,
1017                                 max_buck2, 0x3f);
1018                 max8997_update_reg(i2c, MAX8997_REG_BUCK5DVS1 + i,
1019                                 max_buck5, 0x3f);
1020         }
1021
1022         /*
1023          * If buck 1, 2, and 5 do not care DVS GPIO settings, ignore them.
1024          * If at least one of them cares, set gpios.
1025          */
1026         if (pdata->buck1_gpiodvs || pdata->buck2_gpiodvs ||
1027                         pdata->buck5_gpiodvs) {
1028                 bool gpio1set = false, gpio2set = false;
1029
1030                 if (!gpio_is_valid(pdata->buck125_gpios[0]) ||
1031                                 !gpio_is_valid(pdata->buck125_gpios[1]) ||
1032                                 !gpio_is_valid(pdata->buck125_gpios[2])) {
1033                         dev_err(&pdev->dev, "GPIO NOT VALID\n");
1034                         ret = -EINVAL;
1035                         goto err_out;
1036                 }
1037
1038                 ret = gpio_request(pdata->buck125_gpios[0],
1039                                 "MAX8997 SET1");
1040                 if (ret == -EBUSY)
1041                         dev_warn(&pdev->dev, "Duplicated gpio request"
1042                                         " on SET1\n");
1043                 else if (ret)
1044                         goto err_out;
1045                 else
1046                         gpio1set = true;
1047
1048                 ret = gpio_request(pdata->buck125_gpios[1],
1049                                 "MAX8997 SET2");
1050                 if (ret == -EBUSY)
1051                         dev_warn(&pdev->dev, "Duplicated gpio request"
1052                                         " on SET2\n");
1053                 else if (ret) {
1054                         if (gpio1set)
1055                                 gpio_free(pdata->buck125_gpios[0]);
1056                         goto err_out;
1057                 } else
1058                         gpio2set = true;
1059
1060                 ret = gpio_request(pdata->buck125_gpios[2],
1061                                 "MAX8997 SET3");
1062                 if (ret == -EBUSY)
1063                         dev_warn(&pdev->dev, "Duplicated gpio request"
1064                                         " on SET3\n");
1065                 else if (ret) {
1066                         if (gpio1set)
1067                                 gpio_free(pdata->buck125_gpios[0]);
1068                         if (gpio2set)
1069                                 gpio_free(pdata->buck125_gpios[1]);
1070                         goto err_out;
1071                 }
1072
1073                 gpio_direction_output(pdata->buck125_gpios[0],
1074                                 (max8997->buck125_gpioindex >> 2)
1075                                 & 0x1); /* SET1 */
1076                 gpio_direction_output(pdata->buck125_gpios[1],
1077                                 (max8997->buck125_gpioindex >> 1)
1078                                 & 0x1); /* SET2 */
1079                 gpio_direction_output(pdata->buck125_gpios[2],
1080                                 (max8997->buck125_gpioindex >> 0)
1081                                 & 0x1); /* SET3 */
1082                 ret = 0;
1083         }
1084
1085         /* DVS-GPIO disabled */
1086         max8997_update_reg(i2c, MAX8997_REG_BUCK1CTRL, (pdata->buck1_gpiodvs) ?
1087                         (1 << 1) : (0 << 1), 1 << 1);
1088         max8997_update_reg(i2c, MAX8997_REG_BUCK2CTRL, (pdata->buck2_gpiodvs) ?
1089                         (1 << 1) : (0 << 1), 1 << 1);
1090         max8997_update_reg(i2c, MAX8997_REG_BUCK5CTRL, (pdata->buck5_gpiodvs) ?
1091                         (1 << 1) : (0 << 1), 1 << 1);
1092
1093         /* Initialize all the DVS related BUCK registers */
1094         for (i = 0; i < 8; i++) {
1095                 max8997_update_reg(i2c, MAX8997_REG_BUCK1DVS1 + i,
1096                                 max8997->buck1_vol[i],
1097                                 0x3f);
1098                 max8997_update_reg(i2c, MAX8997_REG_BUCK2DVS1 + i,
1099                                 max8997->buck2_vol[i],
1100                                 0x3f);
1101                 max8997_update_reg(i2c, MAX8997_REG_BUCK5DVS1 + i,
1102                                 max8997->buck5_vol[i],
1103                                 0x3f);
1104         }
1105
1106         /* Misc Settings */
1107         max8997->ramp_delay = 10; /* set 10mV/us, which is the default */
1108         max8997_write_reg(i2c, MAX8997_REG_BUCKRAMP, (0xf << 4) | 0x9);
1109
1110         for (i = 0; i < pdata->num_regulators; i++) {
1111                 const struct voltage_map_desc *desc;
1112                 int id = pdata->regulators[i].id;
1113
1114                 desc = reg_voltage_map[id];
1115                 if (desc)
1116                         regulators[id].n_voltages =
1117                                 (desc->max - desc->min) / desc->step + 1;
1118                 else if (id == MAX8997_ESAFEOUT1 || id == MAX8997_ESAFEOUT2)
1119                         regulators[id].n_voltages = 4;
1120                 else if (id == MAX8997_CHARGER_CV)
1121                         regulators[id].n_voltages = 16;
1122
1123                 config.dev = max8997->dev;
1124                 config.init_data = pdata->regulators[i].initdata;
1125                 config.driver_data = max8997;
1126
1127                 rdev[i] = regulator_register(&regulators[id], &config);
1128                 if (IS_ERR(rdev[i])) {
1129                         ret = PTR_ERR(rdev[i]);
1130                         dev_err(max8997->dev, "regulator init failed for %d\n",
1131                                         id);
1132                         rdev[i] = NULL;
1133                         goto err;
1134                 }
1135         }
1136
1137         return 0;
1138 err:
1139         while (--i >= 0)
1140                 regulator_unregister(rdev[i]);
1141 err_out:
1142         return ret;
1143 }
1144
1145 static int __devexit max8997_pmic_remove(struct platform_device *pdev)
1146 {
1147         struct max8997_data *max8997 = platform_get_drvdata(pdev);
1148         struct regulator_dev **rdev = max8997->rdev;
1149         int i;
1150
1151         for (i = 0; i < max8997->num_regulators; i++)
1152                 regulator_unregister(rdev[i]);
1153         return 0;
1154 }
1155
1156 static const struct platform_device_id max8997_pmic_id[] = {
1157         { "max8997-pmic", 0},
1158         { },
1159 };
1160 MODULE_DEVICE_TABLE(platform, max8997_pmic_id);
1161
1162 static struct platform_driver max8997_pmic_driver = {
1163         .driver = {
1164                 .name = "max8997-pmic",
1165                 .owner = THIS_MODULE,
1166         },
1167         .probe = max8997_pmic_probe,
1168         .remove = __devexit_p(max8997_pmic_remove),
1169         .id_table = max8997_pmic_id,
1170 };
1171
1172 static int __init max8997_pmic_init(void)
1173 {
1174         return platform_driver_register(&max8997_pmic_driver);
1175 }
1176 subsys_initcall(max8997_pmic_init);
1177
1178 static void __exit max8997_pmic_cleanup(void)
1179 {
1180         platform_driver_unregister(&max8997_pmic_driver);
1181 }
1182 module_exit(max8997_pmic_cleanup);
1183
1184 MODULE_DESCRIPTION("MAXIM 8997/8966 Regulator Driver");
1185 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
1186 MODULE_LICENSE("GPL");