linux/drivers/regulator/max8997.c
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   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/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
  37struct 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
  57static inline void max8997_set_gpio(struct max8997_data *max8997)
  58{
  59        int set3 = (max8997->buck125_gpioindex) & 0x1;
  60        int set2 = ((max8997->buck125_gpioindex) >> 1) & 0x1;
  61        int set1 = ((max8997->buck125_gpioindex) >> 2) & 0x1;
  62
  63        gpio_set_value(max8997->buck125_gpios[0], set1);
  64        gpio_set_value(max8997->buck125_gpios[1], set2);
  65        gpio_set_value(max8997->buck125_gpios[2], set3);
  66}
  67
  68struct voltage_map_desc {
  69        int min;
  70        int max;
  71        int step;
  72};
  73
  74/* Voltage maps in uV */
  75static const struct voltage_map_desc ldo_voltage_map_desc = {
  76        .min = 800000,  .max = 3950000, .step = 50000,
  77}; /* LDO1 ~ 18, 21 all */
  78
  79static const struct voltage_map_desc buck1245_voltage_map_desc = {
  80        .min = 650000,  .max = 2225000, .step = 25000,
  81}; /* Buck1, 2, 4, 5 */
  82
  83static const struct voltage_map_desc buck37_voltage_map_desc = {
  84        .min = 750000,  .max = 3900000, .step = 50000,
  85}; /* Buck3, 7 */
  86
  87/* current map in uA */
  88static const struct voltage_map_desc charger_current_map_desc = {
  89        .min = 200000,  .max = 950000,  .step = 50000,
  90};
  91
  92static const struct voltage_map_desc topoff_current_map_desc = {
  93        .min = 50000,   .max = 200000,  .step = 10000,
  94};
  95
  96static const struct voltage_map_desc *reg_voltage_map[] = {
  97        [MAX8997_LDO1] = &ldo_voltage_map_desc,
  98        [MAX8997_LDO2] = &ldo_voltage_map_desc,
  99        [MAX8997_LDO3] = &ldo_voltage_map_desc,
 100        [MAX8997_LDO4] = &ldo_voltage_map_desc,
 101        [MAX8997_LDO5] = &ldo_voltage_map_desc,
 102        [MAX8997_LDO6] = &ldo_voltage_map_desc,
 103        [MAX8997_LDO7] = &ldo_voltage_map_desc,
 104        [MAX8997_LDO8] = &ldo_voltage_map_desc,
 105        [MAX8997_LDO9] = &ldo_voltage_map_desc,
 106        [MAX8997_LDO10] = &ldo_voltage_map_desc,
 107        [MAX8997_LDO11] = &ldo_voltage_map_desc,
 108        [MAX8997_LDO12] = &ldo_voltage_map_desc,
 109        [MAX8997_LDO13] = &ldo_voltage_map_desc,
 110        [MAX8997_LDO14] = &ldo_voltage_map_desc,
 111        [MAX8997_LDO15] = &ldo_voltage_map_desc,
 112        [MAX8997_LDO16] = &ldo_voltage_map_desc,
 113        [MAX8997_LDO17] = &ldo_voltage_map_desc,
 114        [MAX8997_LDO18] = &ldo_voltage_map_desc,
 115        [MAX8997_LDO21] = &ldo_voltage_map_desc,
 116        [MAX8997_BUCK1] = &buck1245_voltage_map_desc,
 117        [MAX8997_BUCK2] = &buck1245_voltage_map_desc,
 118        [MAX8997_BUCK3] = &buck37_voltage_map_desc,
 119        [MAX8997_BUCK4] = &buck1245_voltage_map_desc,
 120        [MAX8997_BUCK5] = &buck1245_voltage_map_desc,
 121        [MAX8997_BUCK6] = NULL,
 122        [MAX8997_BUCK7] = &buck37_voltage_map_desc,
 123        [MAX8997_EN32KHZ_AP] = NULL,
 124        [MAX8997_EN32KHZ_CP] = NULL,
 125        [MAX8997_ENVICHG] = NULL,
 126        [MAX8997_ESAFEOUT1] = NULL,
 127        [MAX8997_ESAFEOUT2] = NULL,
 128        [MAX8997_CHARGER_CV] = NULL,
 129        [MAX8997_CHARGER] = &charger_current_map_desc,
 130        [MAX8997_CHARGER_TOPOFF] = &topoff_current_map_desc,
 131};
 132
 133static int max8997_list_voltage_safeout(struct regulator_dev *rdev,
 134                unsigned int selector)
 135{
 136        int rid = rdev_get_id(rdev);
 137
 138        if (rid == MAX8997_ESAFEOUT1 || rid == MAX8997_ESAFEOUT2) {
 139                switch (selector) {
 140                case 0:
 141                        return 4850000;
 142                case 1:
 143                        return 4900000;
 144                case 2:
 145                        return 4950000;
 146                case 3:
 147                        return 3300000;
 148                default:
 149                        return -EINVAL;
 150                }
 151        }
 152
 153        return -EINVAL;
 154}
 155
 156static int max8997_list_voltage_charger_cv(struct regulator_dev *rdev,
 157                unsigned int selector)
 158{
 159        int rid = rdev_get_id(rdev);
 160
 161        if (rid != MAX8997_CHARGER_CV)
 162                goto err;
 163
 164        switch (selector) {
 165        case 0x00:
 166                return 4200000;
 167        case 0x01 ... 0x0E:
 168                return 4000000 + 20000 * (selector - 0x01);
 169        case 0x0F:
 170                return 4350000;
 171        default:
 172                return -EINVAL;
 173        }
 174err:
 175        return -EINVAL;
 176}
 177
 178static int max8997_list_voltage(struct regulator_dev *rdev,
 179                unsigned int selector)
 180{
 181        const struct voltage_map_desc *desc;
 182        int rid = rdev_get_id(rdev);
 183        int val;
 184
 185        if (rid >= ARRAY_SIZE(reg_voltage_map) ||
 186                        rid < 0)
 187                return -EINVAL;
 188
 189        desc = reg_voltage_map[rid];
 190        if (desc == NULL)
 191                return -EINVAL;
 192
 193        val = desc->min + desc->step * selector;
 194        if (val > desc->max)
 195                return -EINVAL;
 196
 197        return val;
 198}
 199
 200static int max8997_get_enable_register(struct regulator_dev *rdev,
 201                int *reg, int *mask, int *pattern)
 202{
 203        int rid = rdev_get_id(rdev);
 204
 205        switch (rid) {
 206        case MAX8997_LDO1 ... MAX8997_LDO21:
 207                *reg = MAX8997_REG_LDO1CTRL + (rid - MAX8997_LDO1);
 208                *mask = 0xC0;
 209                *pattern = 0xC0;
 210                break;
 211        case MAX8997_BUCK1:
 212                *reg = MAX8997_REG_BUCK1CTRL;
 213                *mask = 0x01;
 214                *pattern = 0x01;
 215                break;
 216        case MAX8997_BUCK2:
 217                *reg = MAX8997_REG_BUCK2CTRL;
 218                *mask = 0x01;
 219                *pattern = 0x01;
 220                break;
 221        case MAX8997_BUCK3:
 222                *reg = MAX8997_REG_BUCK3CTRL;
 223                *mask = 0x01;
 224                *pattern = 0x01;
 225                break;
 226        case MAX8997_BUCK4:
 227                *reg = MAX8997_REG_BUCK4CTRL;
 228                *mask = 0x01;
 229                *pattern = 0x01;
 230                break;
 231        case MAX8997_BUCK5:
 232                *reg = MAX8997_REG_BUCK5CTRL;
 233                *mask = 0x01;
 234                *pattern = 0x01;
 235                break;
 236        case MAX8997_BUCK6:
 237                *reg = MAX8997_REG_BUCK6CTRL;
 238                *mask = 0x01;
 239                *pattern = 0x01;
 240                break;
 241        case MAX8997_BUCK7:
 242                *reg = MAX8997_REG_BUCK7CTRL;
 243                *mask = 0x01;
 244                *pattern = 0x01;
 245                break;
 246        case MAX8997_EN32KHZ_AP ... MAX8997_EN32KHZ_CP:
 247                *reg = MAX8997_REG_MAINCON1;
 248                *mask = 0x01 << (rid - MAX8997_EN32KHZ_AP);
 249                *pattern = 0x01 << (rid - MAX8997_EN32KHZ_AP);
 250                break;
 251        case MAX8997_ENVICHG:
 252                *reg = MAX8997_REG_MBCCTRL1;
 253                *mask = 0x80;
 254                *pattern = 0x80;
 255                break;
 256        case MAX8997_ESAFEOUT1 ... MAX8997_ESAFEOUT2:
 257                *reg = MAX8997_REG_SAFEOUTCTRL;
 258                *mask = 0x40 << (rid - MAX8997_ESAFEOUT1);
 259                *pattern = 0x40 << (rid - MAX8997_ESAFEOUT1);
 260                break;
 261        case MAX8997_CHARGER:
 262                *reg = MAX8997_REG_MBCCTRL2;
 263                *mask = 0x40;
 264                *pattern = 0x40;
 265                break;
 266        default:
 267                /* Not controllable or not exists */
 268                return -EINVAL;
 269        }
 270
 271        return 0;
 272}
 273
 274static int max8997_reg_is_enabled(struct regulator_dev *rdev)
 275{
 276        struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 277        struct i2c_client *i2c = max8997->iodev->i2c;
 278        int ret, reg, mask, pattern;
 279        u8 val;
 280
 281        ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
 282        if (ret)
 283                return ret;
 284
 285        ret = max8997_read_reg(i2c, reg, &val);
 286        if (ret)
 287                return ret;
 288
 289        return (val & mask) == pattern;
 290}
 291
 292static int max8997_reg_enable(struct regulator_dev *rdev)
 293{
 294        struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 295        struct i2c_client *i2c = max8997->iodev->i2c;
 296        int ret, reg, mask, pattern;
 297
 298        ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
 299        if (ret)
 300                return ret;
 301
 302        return max8997_update_reg(i2c, reg, pattern, mask);
 303}
 304
 305static int max8997_reg_disable(struct regulator_dev *rdev)
 306{
 307        struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 308        struct i2c_client *i2c = max8997->iodev->i2c;
 309        int ret, reg, mask, pattern;
 310
 311        ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
 312        if (ret)
 313                return ret;
 314
 315        return max8997_update_reg(i2c, reg, ~pattern, mask);
 316}
 317
 318static int max8997_get_voltage_register(struct regulator_dev *rdev,
 319                int *_reg, int *_shift, int *_mask)
 320{
 321        struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 322        int rid = rdev_get_id(rdev);
 323        int reg, shift = 0, mask = 0x3f;
 324
 325        switch (rid) {
 326        case MAX8997_LDO1 ... MAX8997_LDO21:
 327                reg = MAX8997_REG_LDO1CTRL + (rid - MAX8997_LDO1);
 328                break;
 329        case MAX8997_BUCK1:
 330                reg = MAX8997_REG_BUCK1DVS1;
 331                if (max8997->buck1_gpiodvs)
 332                        reg += max8997->buck125_gpioindex;
 333                break;
 334        case MAX8997_BUCK2:
 335                reg = MAX8997_REG_BUCK2DVS1;
 336                if (max8997->buck2_gpiodvs)
 337                        reg += max8997->buck125_gpioindex;
 338                break;
 339        case MAX8997_BUCK3:
 340                reg = MAX8997_REG_BUCK3DVS;
 341                break;
 342        case MAX8997_BUCK4:
 343                reg = MAX8997_REG_BUCK4DVS;
 344                break;
 345        case MAX8997_BUCK5:
 346                reg = MAX8997_REG_BUCK5DVS1;
 347                if (max8997->buck5_gpiodvs)
 348                        reg += max8997->buck125_gpioindex;
 349                break;
 350        case MAX8997_BUCK7:
 351                reg = MAX8997_REG_BUCK7DVS;
 352                break;
 353        case MAX8997_ESAFEOUT1 ...  MAX8997_ESAFEOUT2:
 354                reg = MAX8997_REG_SAFEOUTCTRL;
 355                shift = (rid == MAX8997_ESAFEOUT2) ? 2 : 0;
 356                mask = 0x3;
 357                break;
 358        case MAX8997_CHARGER_CV:
 359                reg = MAX8997_REG_MBCCTRL3;
 360                shift = 0;
 361                mask = 0xf;
 362                break;
 363        case MAX8997_CHARGER:
 364                reg = MAX8997_REG_MBCCTRL4;
 365                shift = 0;
 366                mask = 0xf;
 367                break;
 368        case MAX8997_CHARGER_TOPOFF:
 369                reg = MAX8997_REG_MBCCTRL5;
 370                shift = 0;
 371                mask = 0xf;
 372                break;
 373        default:
 374                return -EINVAL;
 375        }
 376
 377        *_reg = reg;
 378        *_shift = shift;
 379        *_mask = mask;
 380
 381        return 0;
 382}
 383
 384static int max8997_get_voltage_sel(struct regulator_dev *rdev)
 385{
 386        struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 387        struct i2c_client *i2c = max8997->iodev->i2c;
 388        int reg, shift, mask, ret;
 389        u8 val;
 390
 391        ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
 392        if (ret)
 393                return ret;
 394
 395        ret = max8997_read_reg(i2c, reg, &val);
 396        if (ret)
 397                return ret;
 398
 399        val >>= shift;
 400        val &= mask;
 401
 402        return val;
 403}
 404
 405static inline int max8997_get_voltage_proper_val(
 406                const struct voltage_map_desc *desc,
 407                int min_vol, int max_vol)
 408{
 409        int i;
 410
 411        if (desc == NULL)
 412                return -EINVAL;
 413
 414        if (max_vol < desc->min || min_vol > desc->max)
 415                return -EINVAL;
 416
 417        if (min_vol < desc->min)
 418                min_vol = desc->min;
 419
 420        i = DIV_ROUND_UP(min_vol - desc->min, desc->step);
 421
 422        if (desc->min + desc->step * i > max_vol)
 423                return -EINVAL;
 424
 425        return i;
 426}
 427
 428static int max8997_set_voltage_charger_cv(struct regulator_dev *rdev,
 429                int min_uV, int max_uV, unsigned *selector)
 430{
 431        struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 432        struct i2c_client *i2c = max8997->iodev->i2c;
 433        int rid = rdev_get_id(rdev);
 434        int lb, ub;
 435        int reg, shift = 0, mask, ret = 0;
 436        u8 val = 0x0;
 437
 438        if (rid != MAX8997_CHARGER_CV)
 439                return -EINVAL;
 440
 441        ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
 442        if (ret)
 443                return ret;
 444
 445        if (max_uV < 4000000 || min_uV > 4350000)
 446                return -EINVAL;
 447
 448        if (min_uV <= 4000000) {
 449                if (max_uV >= 4000000)
 450                        return -EINVAL;
 451                else
 452                        val = 0x1;
 453        } else if (min_uV <= 4200000 && max_uV >= 4200000)
 454                val = 0x0;
 455        else {
 456                lb = (min_uV - 4000001) / 20000 + 2;
 457                ub = (max_uV - 4000000) / 20000 + 1;
 458
 459                if (lb > ub)
 460                        return -EINVAL;
 461
 462                if (lb < 0xf)
 463                        val = lb;
 464                else {
 465                        if (ub >= 0xf)
 466                                val = 0xf;
 467                        else
 468                                return -EINVAL;
 469                }
 470        }
 471
 472        *selector = val;
 473
 474        ret = max8997_update_reg(i2c, reg, val << shift, mask);
 475
 476        return ret;
 477}
 478
 479/*
 480 * For LDO1 ~ LDO21, BUCK1~5, BUCK7, CHARGER, CHARGER_TOPOFF
 481 * BUCK1, 2, and 5 are available if they are not controlled by gpio
 482 */
 483static int max8997_set_voltage_ldobuck(struct regulator_dev *rdev,
 484                int min_uV, int max_uV, unsigned *selector)
 485{
 486        struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 487        struct i2c_client *i2c = max8997->iodev->i2c;
 488        const struct voltage_map_desc *desc;
 489        int rid = rdev_get_id(rdev);
 490        int i, reg, shift, mask, ret;
 491
 492        switch (rid) {
 493        case MAX8997_LDO1 ... MAX8997_LDO21:
 494                break;
 495        case MAX8997_BUCK1 ... MAX8997_BUCK5:
 496                break;
 497        case MAX8997_BUCK6:
 498                return -EINVAL;
 499        case MAX8997_BUCK7:
 500                break;
 501        case MAX8997_CHARGER:
 502                break;
 503        case MAX8997_CHARGER_TOPOFF:
 504                break;
 505        default:
 506                return -EINVAL;
 507        }
 508
 509        desc = reg_voltage_map[rid];
 510
 511        i = max8997_get_voltage_proper_val(desc, min_uV, max_uV);
 512        if (i < 0)
 513                return i;
 514
 515        ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
 516        if (ret)
 517                return ret;
 518
 519        ret = max8997_update_reg(i2c, reg, i << shift, mask << shift);
 520        *selector = i;
 521
 522        return ret;
 523}
 524
 525static int max8997_set_voltage_ldobuck_time_sel(struct regulator_dev *rdev,
 526                                                unsigned int old_selector,
 527                                                unsigned int new_selector)
 528{
 529        struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 530        int rid = rdev_get_id(rdev);
 531        const struct voltage_map_desc *desc = reg_voltage_map[rid];
 532
 533        /* Delay is required only if the voltage is increasing */
 534        if (old_selector >= new_selector)
 535                return 0;
 536
 537        /* No need to delay if gpio_dvs_mode */
 538        switch (rid) {
 539        case MAX8997_BUCK1:
 540                if (max8997->buck1_gpiodvs)
 541                        return 0;
 542                break;
 543        case MAX8997_BUCK2:
 544                if (max8997->buck2_gpiodvs)
 545                        return 0;
 546                break;
 547        case MAX8997_BUCK5:
 548                if (max8997->buck5_gpiodvs)
 549                        return 0;
 550                break;
 551        }
 552
 553        switch (rid) {
 554        case MAX8997_BUCK1:
 555        case MAX8997_BUCK2:
 556        case MAX8997_BUCK4:
 557        case MAX8997_BUCK5:
 558                return DIV_ROUND_UP(desc->step * (new_selector - old_selector),
 559                                    max8997->ramp_delay * 1000);
 560        }
 561
 562        return 0;
 563}
 564
 565/*
 566 * Assess the damage on the voltage setting of BUCK1,2,5 by the change.
 567 *
 568 * When GPIO-DVS mode is used for multiple bucks, changing the voltage value
 569 * of one of the bucks may affect that of another buck, which is the side
 570 * effect of the change (set_voltage). This function examines the GPIO-DVS
 571 * configurations and checks whether such side-effect exists.
 572 */
 573static int max8997_assess_side_effect(struct regulator_dev *rdev,
 574                u8 new_val, int *best)
 575{
 576        struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 577        int rid = rdev_get_id(rdev);
 578        u8 *buckx_val[3];
 579        bool buckx_gpiodvs[3];
 580        int side_effect[8];
 581        int min_side_effect = INT_MAX;
 582        int i;
 583
 584        *best = -1;
 585
 586        switch (rid) {
 587        case MAX8997_BUCK1:
 588                rid = 0;
 589                break;
 590        case MAX8997_BUCK2:
 591                rid = 1;
 592                break;
 593        case MAX8997_BUCK5:
 594                rid = 2;
 595                break;
 596        default:
 597                return -EINVAL;
 598        }
 599
 600        buckx_val[0] = max8997->buck1_vol;
 601        buckx_val[1] = max8997->buck2_vol;
 602        buckx_val[2] = max8997->buck5_vol;
 603        buckx_gpiodvs[0] = max8997->buck1_gpiodvs;
 604        buckx_gpiodvs[1] = max8997->buck2_gpiodvs;
 605        buckx_gpiodvs[2] = max8997->buck5_gpiodvs;
 606
 607        for (i = 0; i < 8; i++) {
 608                int others;
 609
 610                if (new_val != (buckx_val[rid])[i]) {
 611                        side_effect[i] = -1;
 612                        continue;
 613                }
 614
 615                side_effect[i] = 0;
 616                for (others = 0; others < 3; others++) {
 617                        int diff;
 618
 619                        if (others == rid)
 620                                continue;
 621                        if (buckx_gpiodvs[others] == false)
 622                                continue; /* Not affected */
 623                        diff = (buckx_val[others])[i] -
 624                                (buckx_val[others])[max8997->buck125_gpioindex];
 625                        if (diff > 0)
 626                                side_effect[i] += diff;
 627                        else if (diff < 0)
 628                                side_effect[i] -= diff;
 629                }
 630                if (side_effect[i] == 0) {
 631                        *best = i;
 632                        return 0; /* NO SIDE EFFECT! Use This! */
 633                }
 634                if (side_effect[i] < min_side_effect) {
 635                        min_side_effect = side_effect[i];
 636                        *best = i;
 637                }
 638        }
 639
 640        if (*best == -1)
 641                return -EINVAL;
 642
 643        return side_effect[*best];
 644}
 645
 646/*
 647 * For Buck 1 ~ 5 and 7. If it is not controlled by GPIO, this calls
 648 * max8997_set_voltage_ldobuck to do the job.
 649 */
 650static int max8997_set_voltage_buck(struct regulator_dev *rdev,
 651                int min_uV, int max_uV, unsigned *selector)
 652{
 653        struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 654        int rid = rdev_get_id(rdev);
 655        const struct voltage_map_desc *desc;
 656        int new_val, new_idx, damage, tmp_val, tmp_idx, tmp_dmg;
 657        bool gpio_dvs_mode = false;
 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_uV, max_uV);
 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
 712out:
 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
 723static const int safeoutvolt[] = {
 724        3300000,
 725        4850000,
 726        4900000,
 727        4950000,
 728};
 729
 730/* For SAFEOUT1 and SAFEOUT2 */
 731static 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
 768static 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
 795static 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
 806static 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
 817static 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
 825static 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
 835static 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
 841static 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
 854static 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
 869static 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
 877static 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
 898static 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#ifdef CONFIG_OF
 937static int max8997_pmic_dt_parse_dvs_gpio(struct platform_device *pdev,
 938                        struct max8997_platform_data *pdata,
 939                        struct device_node *pmic_np)
 940{
 941        int i, gpio;
 942
 943        for (i = 0; i < 3; i++) {
 944                gpio = of_get_named_gpio(pmic_np,
 945                                        "max8997,pmic-buck125-dvs-gpios", i);
 946                if (!gpio_is_valid(gpio)) {
 947                        dev_err(&pdev->dev, "invalid gpio[%d]: %d\n", i, gpio);
 948                        return -EINVAL;
 949                }
 950                pdata->buck125_gpios[i] = gpio;
 951        }
 952        return 0;
 953}
 954
 955static int max8997_pmic_dt_parse_pdata(struct platform_device *pdev,
 956                                        struct max8997_platform_data *pdata)
 957{
 958        struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 959        struct device_node *pmic_np, *regulators_np, *reg_np;
 960        struct max8997_regulator_data *rdata;
 961        unsigned int i, dvs_voltage_nr = 1, ret;
 962
 963        pmic_np = iodev->dev->of_node;
 964        if (!pmic_np) {
 965                dev_err(&pdev->dev, "could not find pmic sub-node\n");
 966                return -ENODEV;
 967        }
 968
 969        regulators_np = of_find_node_by_name(pmic_np, "regulators");
 970        if (!regulators_np) {
 971                dev_err(&pdev->dev, "could not find regulators sub-node\n");
 972                return -EINVAL;
 973        }
 974
 975        /* count the number of regulators to be supported in pmic */
 976        pdata->num_regulators = 0;
 977        for_each_child_of_node(regulators_np, reg_np)
 978                pdata->num_regulators++;
 979
 980        rdata = devm_kzalloc(&pdev->dev, sizeof(*rdata) *
 981                                pdata->num_regulators, GFP_KERNEL);
 982        if (!rdata) {
 983                dev_err(&pdev->dev, "could not allocate memory for regulator data\n");
 984                return -ENOMEM;
 985        }
 986
 987        pdata->regulators = rdata;
 988        for_each_child_of_node(regulators_np, reg_np) {
 989                for (i = 0; i < ARRAY_SIZE(regulators); i++)
 990                        if (!of_node_cmp(reg_np->name, regulators[i].name))
 991                                break;
 992
 993                if (i == ARRAY_SIZE(regulators)) {
 994                        dev_warn(&pdev->dev, "don't know how to configure regulator %s\n",
 995                                 reg_np->name);
 996                        continue;
 997                }
 998
 999                rdata->id = i;
1000                rdata->initdata = of_get_regulator_init_data(&pdev->dev,
1001                                                             reg_np);
1002                rdata->reg_node = reg_np;
1003                rdata++;
1004        }
1005
1006        if (of_get_property(pmic_np, "max8997,pmic-buck1-uses-gpio-dvs", NULL))
1007                pdata->buck1_gpiodvs = true;
1008
1009        if (of_get_property(pmic_np, "max8997,pmic-buck2-uses-gpio-dvs", NULL))
1010                pdata->buck2_gpiodvs = true;
1011
1012        if (of_get_property(pmic_np, "max8997,pmic-buck5-uses-gpio-dvs", NULL))
1013                pdata->buck5_gpiodvs = true;
1014
1015        if (pdata->buck1_gpiodvs || pdata->buck2_gpiodvs ||
1016                                                pdata->buck5_gpiodvs) {
1017                ret = max8997_pmic_dt_parse_dvs_gpio(pdev, pdata, pmic_np);
1018                if (ret)
1019                        return -EINVAL;
1020
1021                if (of_property_read_u32(pmic_np,
1022                                "max8997,pmic-buck125-default-dvs-idx",
1023                                &pdata->buck125_default_idx)) {
1024                        pdata->buck125_default_idx = 0;
1025                } else {
1026                        if (pdata->buck125_default_idx >= 8) {
1027                                pdata->buck125_default_idx = 0;
1028                                dev_info(&pdev->dev, "invalid value for default dvs index, using 0 instead\n");
1029                        }
1030                }
1031
1032                if (of_get_property(pmic_np,
1033                        "max8997,pmic-ignore-gpiodvs-side-effect", NULL))
1034                        pdata->ignore_gpiodvs_side_effect = true;
1035
1036                dvs_voltage_nr = 8;
1037        }
1038
1039        if (of_property_read_u32_array(pmic_np,
1040                                "max8997,pmic-buck1-dvs-voltage",
1041                                pdata->buck1_voltage, dvs_voltage_nr)) {
1042                dev_err(&pdev->dev, "buck1 voltages not specified\n");
1043                return -EINVAL;
1044        }
1045
1046        if (of_property_read_u32_array(pmic_np,
1047                                "max8997,pmic-buck2-dvs-voltage",
1048                                pdata->buck2_voltage, dvs_voltage_nr)) {
1049                dev_err(&pdev->dev, "buck2 voltages not specified\n");
1050                return -EINVAL;
1051        }
1052
1053        if (of_property_read_u32_array(pmic_np,
1054                                "max8997,pmic-buck5-dvs-voltage",
1055                                pdata->buck5_voltage, dvs_voltage_nr)) {
1056                dev_err(&pdev->dev, "buck5 voltages not specified\n");
1057                return -EINVAL;
1058        }
1059
1060        return 0;
1061}
1062#else
1063static int max8997_pmic_dt_parse_pdata(struct platform_device *pdev,
1064                                        struct max8997_platform_data *pdata)
1065{
1066        return 0;
1067}
1068#endif /* CONFIG_OF */
1069
1070static int max8997_pmic_probe(struct platform_device *pdev)
1071{
1072        struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
1073        struct max8997_platform_data *pdata = iodev->pdata;
1074        struct regulator_config config = { };
1075        struct regulator_dev **rdev;
1076        struct max8997_data *max8997;
1077        struct i2c_client *i2c;
1078        int i, ret, size, nr_dvs;
1079        u8 max_buck1 = 0, max_buck2 = 0, max_buck5 = 0;
1080
1081        if (IS_ERR_OR_NULL(pdata)) {
1082                dev_err(pdev->dev.parent, "No platform init data supplied.\n");
1083                return -ENODEV;
1084        }
1085
1086        if (iodev->dev->of_node) {
1087                ret = max8997_pmic_dt_parse_pdata(pdev, pdata);
1088                if (ret)
1089                        return ret;
1090        }
1091
1092        max8997 = devm_kzalloc(&pdev->dev, sizeof(struct max8997_data),
1093                               GFP_KERNEL);
1094        if (!max8997)
1095                return -ENOMEM;
1096
1097        size = sizeof(struct regulator_dev *) * pdata->num_regulators;
1098        max8997->rdev = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
1099        if (!max8997->rdev)
1100                return -ENOMEM;
1101
1102        rdev = max8997->rdev;
1103        max8997->dev = &pdev->dev;
1104        max8997->iodev = iodev;
1105        max8997->num_regulators = pdata->num_regulators;
1106        platform_set_drvdata(pdev, max8997);
1107        i2c = max8997->iodev->i2c;
1108
1109        max8997->buck125_gpioindex = pdata->buck125_default_idx;
1110        max8997->buck1_gpiodvs = pdata->buck1_gpiodvs;
1111        max8997->buck2_gpiodvs = pdata->buck2_gpiodvs;
1112        max8997->buck5_gpiodvs = pdata->buck5_gpiodvs;
1113        memcpy(max8997->buck125_gpios, pdata->buck125_gpios, sizeof(int) * 3);
1114        max8997->ignore_gpiodvs_side_effect = pdata->ignore_gpiodvs_side_effect;
1115
1116        nr_dvs = (pdata->buck1_gpiodvs || pdata->buck2_gpiodvs ||
1117                        pdata->buck5_gpiodvs) ? 8 : 1;
1118
1119        for (i = 0; i < nr_dvs; i++) {
1120                max8997->buck1_vol[i] = ret =
1121                        max8997_get_voltage_proper_val(
1122                                        &buck1245_voltage_map_desc,
1123                                        pdata->buck1_voltage[i],
1124                                        pdata->buck1_voltage[i] +
1125                                        buck1245_voltage_map_desc.step);
1126                if (ret < 0)
1127                        goto err_out;
1128
1129                max8997->buck2_vol[i] = ret =
1130                        max8997_get_voltage_proper_val(
1131                                        &buck1245_voltage_map_desc,
1132                                        pdata->buck2_voltage[i],
1133                                        pdata->buck2_voltage[i] +
1134                                        buck1245_voltage_map_desc.step);
1135                if (ret < 0)
1136                        goto err_out;
1137
1138                max8997->buck5_vol[i] = ret =
1139                        max8997_get_voltage_proper_val(
1140                                        &buck1245_voltage_map_desc,
1141                                        pdata->buck5_voltage[i],
1142                                        pdata->buck5_voltage[i] +
1143                                        buck1245_voltage_map_desc.step);
1144                if (ret < 0)
1145                        goto err_out;
1146
1147                if (max_buck1 < max8997->buck1_vol[i])
1148                        max_buck1 = max8997->buck1_vol[i];
1149                if (max_buck2 < max8997->buck2_vol[i])
1150                        max_buck2 = max8997->buck2_vol[i];
1151                if (max_buck5 < max8997->buck5_vol[i])
1152                        max_buck5 = max8997->buck5_vol[i];
1153        }
1154
1155        /* For the safety, set max voltage before setting up */
1156        for (i = 0; i < 8; i++) {
1157                max8997_update_reg(i2c, MAX8997_REG_BUCK1DVS1 + i,
1158                                max_buck1, 0x3f);
1159                max8997_update_reg(i2c, MAX8997_REG_BUCK2DVS1 + i,
1160                                max_buck2, 0x3f);
1161                max8997_update_reg(i2c, MAX8997_REG_BUCK5DVS1 + i,
1162                                max_buck5, 0x3f);
1163        }
1164
1165        /* Initialize all the DVS related BUCK registers */
1166        for (i = 0; i < nr_dvs; i++) {
1167                max8997_update_reg(i2c, MAX8997_REG_BUCK1DVS1 + i,
1168                                max8997->buck1_vol[i],
1169                                0x3f);
1170                max8997_update_reg(i2c, MAX8997_REG_BUCK2DVS1 + i,
1171                                max8997->buck2_vol[i],
1172                                0x3f);
1173                max8997_update_reg(i2c, MAX8997_REG_BUCK5DVS1 + i,
1174                                max8997->buck5_vol[i],
1175                                0x3f);
1176        }
1177
1178        /*
1179         * If buck 1, 2, and 5 do not care DVS GPIO settings, ignore them.
1180         * If at least one of them cares, set gpios.
1181         */
1182        if (pdata->buck1_gpiodvs || pdata->buck2_gpiodvs ||
1183                        pdata->buck5_gpiodvs) {
1184
1185                if (!gpio_is_valid(pdata->buck125_gpios[0]) ||
1186                                !gpio_is_valid(pdata->buck125_gpios[1]) ||
1187                                !gpio_is_valid(pdata->buck125_gpios[2])) {
1188                        dev_err(&pdev->dev, "GPIO NOT VALID\n");
1189                        ret = -EINVAL;
1190                        goto err_out;
1191                }
1192
1193                ret = devm_gpio_request(&pdev->dev, pdata->buck125_gpios[0],
1194                                        "MAX8997 SET1");
1195                if (ret)
1196                        goto err_out;
1197
1198                ret = devm_gpio_request(&pdev->dev, pdata->buck125_gpios[1],
1199                                        "MAX8997 SET2");
1200                if (ret)
1201                        goto err_out;
1202
1203                ret = devm_gpio_request(&pdev->dev, pdata->buck125_gpios[2],
1204                                "MAX8997 SET3");
1205                if (ret)
1206                        goto err_out;
1207
1208                gpio_direction_output(pdata->buck125_gpios[0],
1209                                (max8997->buck125_gpioindex >> 2)
1210                                & 0x1); /* SET1 */
1211                gpio_direction_output(pdata->buck125_gpios[1],
1212                                (max8997->buck125_gpioindex >> 1)
1213                                & 0x1); /* SET2 */
1214                gpio_direction_output(pdata->buck125_gpios[2],
1215                                (max8997->buck125_gpioindex >> 0)
1216                                & 0x1); /* SET3 */
1217        }
1218
1219        /* DVS-GPIO disabled */
1220        max8997_update_reg(i2c, MAX8997_REG_BUCK1CTRL, (pdata->buck1_gpiodvs) ?
1221                        (1 << 1) : (0 << 1), 1 << 1);
1222        max8997_update_reg(i2c, MAX8997_REG_BUCK2CTRL, (pdata->buck2_gpiodvs) ?
1223                        (1 << 1) : (0 << 1), 1 << 1);
1224        max8997_update_reg(i2c, MAX8997_REG_BUCK5CTRL, (pdata->buck5_gpiodvs) ?
1225                        (1 << 1) : (0 << 1), 1 << 1);
1226
1227        /* Misc Settings */
1228        max8997->ramp_delay = 10; /* set 10mV/us, which is the default */
1229        max8997_write_reg(i2c, MAX8997_REG_BUCKRAMP, (0xf << 4) | 0x9);
1230
1231        for (i = 0; i < pdata->num_regulators; i++) {
1232                const struct voltage_map_desc *desc;
1233                int id = pdata->regulators[i].id;
1234
1235                desc = reg_voltage_map[id];
1236                if (desc)
1237                        regulators[id].n_voltages =
1238                                (desc->max - desc->min) / desc->step + 1;
1239                else if (id == MAX8997_ESAFEOUT1 || id == MAX8997_ESAFEOUT2)
1240                        regulators[id].n_voltages = 4;
1241                else if (id == MAX8997_CHARGER_CV)
1242                        regulators[id].n_voltages = 16;
1243
1244                config.dev = max8997->dev;
1245                config.init_data = pdata->regulators[i].initdata;
1246                config.driver_data = max8997;
1247                config.of_node = pdata->regulators[i].reg_node;
1248
1249                rdev[i] = regulator_register(&regulators[id], &config);
1250                if (IS_ERR(rdev[i])) {
1251                        ret = PTR_ERR(rdev[i]);
1252                        dev_err(max8997->dev, "regulator init failed for %d\n",
1253                                        id);
1254                        rdev[i] = NULL;
1255                        goto err;
1256                }
1257        }
1258
1259        return 0;
1260err:
1261        while (--i >= 0)
1262                regulator_unregister(rdev[i]);
1263err_out:
1264        return ret;
1265}
1266
1267static int max8997_pmic_remove(struct platform_device *pdev)
1268{
1269        struct max8997_data *max8997 = platform_get_drvdata(pdev);
1270        struct regulator_dev **rdev = max8997->rdev;
1271        int i;
1272
1273        for (i = 0; i < max8997->num_regulators; i++)
1274                regulator_unregister(rdev[i]);
1275        return 0;
1276}
1277
1278static const struct platform_device_id max8997_pmic_id[] = {
1279        { "max8997-pmic", 0},
1280        { },
1281};
1282MODULE_DEVICE_TABLE(platform, max8997_pmic_id);
1283
1284static struct platform_driver max8997_pmic_driver = {
1285        .driver = {
1286                .name = "max8997-pmic",
1287                .owner = THIS_MODULE,
1288        },
1289        .probe = max8997_pmic_probe,
1290        .remove = max8997_pmic_remove,
1291        .id_table = max8997_pmic_id,
1292};
1293
1294static int __init max8997_pmic_init(void)
1295{
1296        return platform_driver_register(&max8997_pmic_driver);
1297}
1298subsys_initcall(max8997_pmic_init);
1299
1300static void __exit max8997_pmic_cleanup(void)
1301{
1302        platform_driver_unregister(&max8997_pmic_driver);
1303}
1304module_exit(max8997_pmic_cleanup);
1305
1306MODULE_DESCRIPTION("MAXIM 8997/8966 Regulator Driver");
1307MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
1308MODULE_LICENSE("GPL");
1309
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