linux/drivers/regulator/max8997-regulator.c
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   1// SPDX-License-Identifier: GPL-2.0+
   2//
   3// max8997.c - Regulator driver for the Maxim 8997/8966
   4//
   5// Copyright (C) 2011 Samsung Electronics
   6// MyungJoo Ham <myungjoo.ham@samsung.com>
   7//
   8// This driver is based on max8998.c
   9
  10#include <linux/bug.h>
  11#include <linux/err.h>
  12#include <linux/gpio.h>
  13#include <linux/of_gpio.h>
  14#include <linux/slab.h>
  15#include <linux/module.h>
  16#include <linux/platform_device.h>
  17#include <linux/regulator/driver.h>
  18#include <linux/regulator/machine.h>
  19#include <linux/mfd/max8997.h>
  20#include <linux/mfd/max8997-private.h>
  21#include <linux/regulator/of_regulator.h>
  22
  23struct max8997_data {
  24        struct device *dev;
  25        struct max8997_dev *iodev;
  26        int num_regulators;
  27        int ramp_delay; /* in mV/us */
  28
  29        bool buck1_gpiodvs;
  30        bool buck2_gpiodvs;
  31        bool buck5_gpiodvs;
  32        u8 buck1_vol[8];
  33        u8 buck2_vol[8];
  34        u8 buck5_vol[8];
  35        int buck125_gpios[3];
  36        int buck125_gpioindex;
  37        bool ignore_gpiodvs_side_effect;
  38
  39        u8 saved_states[MAX8997_REG_MAX];
  40};
  41
  42static const unsigned int safeoutvolt[] = {
  43        4850000,
  44        4900000,
  45        4950000,
  46        3300000,
  47};
  48
  49static inline void max8997_set_gpio(struct max8997_data *max8997)
  50{
  51        int set3 = (max8997->buck125_gpioindex) & 0x1;
  52        int set2 = ((max8997->buck125_gpioindex) >> 1) & 0x1;
  53        int set1 = ((max8997->buck125_gpioindex) >> 2) & 0x1;
  54
  55        gpio_set_value(max8997->buck125_gpios[0], set1);
  56        gpio_set_value(max8997->buck125_gpios[1], set2);
  57        gpio_set_value(max8997->buck125_gpios[2], set3);
  58}
  59
  60struct voltage_map_desc {
  61        int min;
  62        int max;
  63        int step;
  64};
  65
  66/* Voltage maps in uV */
  67static const struct voltage_map_desc ldo_voltage_map_desc = {
  68        .min = 800000,  .max = 3950000, .step = 50000,
  69}; /* LDO1 ~ 18, 21 all */
  70
  71static const struct voltage_map_desc buck1245_voltage_map_desc = {
  72        .min = 650000,  .max = 2225000, .step = 25000,
  73}; /* Buck1, 2, 4, 5 */
  74
  75static const struct voltage_map_desc buck37_voltage_map_desc = {
  76        .min = 750000,  .max = 3900000, .step = 50000,
  77}; /* Buck3, 7 */
  78
  79/* current map in uA */
  80static const struct voltage_map_desc charger_current_map_desc = {
  81        .min = 200000,  .max = 950000,  .step = 50000,
  82};
  83
  84static const struct voltage_map_desc topoff_current_map_desc = {
  85        .min = 50000,   .max = 200000,  .step = 10000,
  86};
  87
  88static const struct voltage_map_desc *reg_voltage_map[] = {
  89        [MAX8997_LDO1] = &ldo_voltage_map_desc,
  90        [MAX8997_LDO2] = &ldo_voltage_map_desc,
  91        [MAX8997_LDO3] = &ldo_voltage_map_desc,
  92        [MAX8997_LDO4] = &ldo_voltage_map_desc,
  93        [MAX8997_LDO5] = &ldo_voltage_map_desc,
  94        [MAX8997_LDO6] = &ldo_voltage_map_desc,
  95        [MAX8997_LDO7] = &ldo_voltage_map_desc,
  96        [MAX8997_LDO8] = &ldo_voltage_map_desc,
  97        [MAX8997_LDO9] = &ldo_voltage_map_desc,
  98        [MAX8997_LDO10] = &ldo_voltage_map_desc,
  99        [MAX8997_LDO11] = &ldo_voltage_map_desc,
 100        [MAX8997_LDO12] = &ldo_voltage_map_desc,
 101        [MAX8997_LDO13] = &ldo_voltage_map_desc,
 102        [MAX8997_LDO14] = &ldo_voltage_map_desc,
 103        [MAX8997_LDO15] = &ldo_voltage_map_desc,
 104        [MAX8997_LDO16] = &ldo_voltage_map_desc,
 105        [MAX8997_LDO17] = &ldo_voltage_map_desc,
 106        [MAX8997_LDO18] = &ldo_voltage_map_desc,
 107        [MAX8997_LDO21] = &ldo_voltage_map_desc,
 108        [MAX8997_BUCK1] = &buck1245_voltage_map_desc,
 109        [MAX8997_BUCK2] = &buck1245_voltage_map_desc,
 110        [MAX8997_BUCK3] = &buck37_voltage_map_desc,
 111        [MAX8997_BUCK4] = &buck1245_voltage_map_desc,
 112        [MAX8997_BUCK5] = &buck1245_voltage_map_desc,
 113        [MAX8997_BUCK6] = NULL,
 114        [MAX8997_BUCK7] = &buck37_voltage_map_desc,
 115        [MAX8997_EN32KHZ_AP] = NULL,
 116        [MAX8997_EN32KHZ_CP] = NULL,
 117        [MAX8997_ENVICHG] = NULL,
 118        [MAX8997_ESAFEOUT1] = NULL,
 119        [MAX8997_ESAFEOUT2] = NULL,
 120        [MAX8997_CHARGER_CV] = NULL,
 121        [MAX8997_CHARGER] = &charger_current_map_desc,
 122        [MAX8997_CHARGER_TOPOFF] = &topoff_current_map_desc,
 123};
 124
 125static int max8997_list_voltage_charger_cv(struct regulator_dev *rdev,
 126                unsigned int selector)
 127{
 128        int rid = rdev_get_id(rdev);
 129
 130        if (rid != MAX8997_CHARGER_CV)
 131                goto err;
 132
 133        switch (selector) {
 134        case 0x00:
 135                return 4200000;
 136        case 0x01 ... 0x0E:
 137                return 4000000 + 20000 * (selector - 0x01);
 138        case 0x0F:
 139                return 4350000;
 140        default:
 141                return -EINVAL;
 142        }
 143err:
 144        return -EINVAL;
 145}
 146
 147static int max8997_list_voltage(struct regulator_dev *rdev,
 148                unsigned int selector)
 149{
 150        const struct voltage_map_desc *desc;
 151        int rid = rdev_get_id(rdev);
 152        int val;
 153
 154        if (rid < 0 || rid >= ARRAY_SIZE(reg_voltage_map))
 155                return -EINVAL;
 156
 157        desc = reg_voltage_map[rid];
 158        if (desc == NULL)
 159                return -EINVAL;
 160
 161        val = desc->min + desc->step * selector;
 162        if (val > desc->max)
 163                return -EINVAL;
 164
 165        return val;
 166}
 167
 168static int max8997_get_enable_register(struct regulator_dev *rdev,
 169                int *reg, int *mask, int *pattern)
 170{
 171        int rid = rdev_get_id(rdev);
 172
 173        switch (rid) {
 174        case MAX8997_LDO1 ... MAX8997_LDO21:
 175                *reg = MAX8997_REG_LDO1CTRL + (rid - MAX8997_LDO1);
 176                *mask = 0xC0;
 177                *pattern = 0xC0;
 178                break;
 179        case MAX8997_BUCK1:
 180                *reg = MAX8997_REG_BUCK1CTRL;
 181                *mask = 0x01;
 182                *pattern = 0x01;
 183                break;
 184        case MAX8997_BUCK2:
 185                *reg = MAX8997_REG_BUCK2CTRL;
 186                *mask = 0x01;
 187                *pattern = 0x01;
 188                break;
 189        case MAX8997_BUCK3:
 190                *reg = MAX8997_REG_BUCK3CTRL;
 191                *mask = 0x01;
 192                *pattern = 0x01;
 193                break;
 194        case MAX8997_BUCK4:
 195                *reg = MAX8997_REG_BUCK4CTRL;
 196                *mask = 0x01;
 197                *pattern = 0x01;
 198                break;
 199        case MAX8997_BUCK5:
 200                *reg = MAX8997_REG_BUCK5CTRL;
 201                *mask = 0x01;
 202                *pattern = 0x01;
 203                break;
 204        case MAX8997_BUCK6:
 205                *reg = MAX8997_REG_BUCK6CTRL;
 206                *mask = 0x01;
 207                *pattern = 0x01;
 208                break;
 209        case MAX8997_BUCK7:
 210                *reg = MAX8997_REG_BUCK7CTRL;
 211                *mask = 0x01;
 212                *pattern = 0x01;
 213                break;
 214        case MAX8997_EN32KHZ_AP ... MAX8997_EN32KHZ_CP:
 215                *reg = MAX8997_REG_MAINCON1;
 216                *mask = 0x01 << (rid - MAX8997_EN32KHZ_AP);
 217                *pattern = 0x01 << (rid - MAX8997_EN32KHZ_AP);
 218                break;
 219        case MAX8997_ENVICHG:
 220                *reg = MAX8997_REG_MBCCTRL1;
 221                *mask = 0x80;
 222                *pattern = 0x80;
 223                break;
 224        case MAX8997_ESAFEOUT1 ... MAX8997_ESAFEOUT2:
 225                *reg = MAX8997_REG_SAFEOUTCTRL;
 226                *mask = 0x40 << (rid - MAX8997_ESAFEOUT1);
 227                *pattern = 0x40 << (rid - MAX8997_ESAFEOUT1);
 228                break;
 229        case MAX8997_CHARGER:
 230                *reg = MAX8997_REG_MBCCTRL2;
 231                *mask = 0x40;
 232                *pattern = 0x40;
 233                break;
 234        default:
 235                /* Not controllable or not exists */
 236                return -EINVAL;
 237        }
 238
 239        return 0;
 240}
 241
 242static int max8997_reg_is_enabled(struct regulator_dev *rdev)
 243{
 244        struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 245        struct i2c_client *i2c = max8997->iodev->i2c;
 246        int ret, reg, mask, pattern;
 247        u8 val;
 248
 249        ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
 250        if (ret)
 251                return ret;
 252
 253        ret = max8997_read_reg(i2c, reg, &val);
 254        if (ret)
 255                return ret;
 256
 257        return (val & mask) == pattern;
 258}
 259
 260static int max8997_reg_enable(struct regulator_dev *rdev)
 261{
 262        struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 263        struct i2c_client *i2c = max8997->iodev->i2c;
 264        int ret, reg, mask, pattern;
 265
 266        ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
 267        if (ret)
 268                return ret;
 269
 270        return max8997_update_reg(i2c, reg, pattern, mask);
 271}
 272
 273static int max8997_reg_disable(struct regulator_dev *rdev)
 274{
 275        struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 276        struct i2c_client *i2c = max8997->iodev->i2c;
 277        int ret, reg, mask, pattern;
 278
 279        ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
 280        if (ret)
 281                return ret;
 282
 283        return max8997_update_reg(i2c, reg, ~pattern, mask);
 284}
 285
 286static int max8997_get_voltage_register(struct regulator_dev *rdev,
 287                int *_reg, int *_shift, int *_mask)
 288{
 289        struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 290        int rid = rdev_get_id(rdev);
 291        int reg, shift = 0, mask = 0x3f;
 292
 293        switch (rid) {
 294        case MAX8997_LDO1 ... MAX8997_LDO21:
 295                reg = MAX8997_REG_LDO1CTRL + (rid - MAX8997_LDO1);
 296                break;
 297        case MAX8997_BUCK1:
 298                reg = MAX8997_REG_BUCK1DVS1;
 299                if (max8997->buck1_gpiodvs)
 300                        reg += max8997->buck125_gpioindex;
 301                break;
 302        case MAX8997_BUCK2:
 303                reg = MAX8997_REG_BUCK2DVS1;
 304                if (max8997->buck2_gpiodvs)
 305                        reg += max8997->buck125_gpioindex;
 306                break;
 307        case MAX8997_BUCK3:
 308                reg = MAX8997_REG_BUCK3DVS;
 309                break;
 310        case MAX8997_BUCK4:
 311                reg = MAX8997_REG_BUCK4DVS;
 312                break;
 313        case MAX8997_BUCK5:
 314                reg = MAX8997_REG_BUCK5DVS1;
 315                if (max8997->buck5_gpiodvs)
 316                        reg += max8997->buck125_gpioindex;
 317                break;
 318        case MAX8997_BUCK7:
 319                reg = MAX8997_REG_BUCK7DVS;
 320                break;
 321        case MAX8997_ESAFEOUT1 ...  MAX8997_ESAFEOUT2:
 322                reg = MAX8997_REG_SAFEOUTCTRL;
 323                shift = (rid == MAX8997_ESAFEOUT2) ? 2 : 0;
 324                mask = 0x3;
 325                break;
 326        case MAX8997_CHARGER_CV:
 327                reg = MAX8997_REG_MBCCTRL3;
 328                shift = 0;
 329                mask = 0xf;
 330                break;
 331        case MAX8997_CHARGER:
 332                reg = MAX8997_REG_MBCCTRL4;
 333                shift = 0;
 334                mask = 0xf;
 335                break;
 336        case MAX8997_CHARGER_TOPOFF:
 337                reg = MAX8997_REG_MBCCTRL5;
 338                shift = 0;
 339                mask = 0xf;
 340                break;
 341        default:
 342                return -EINVAL;
 343        }
 344
 345        *_reg = reg;
 346        *_shift = shift;
 347        *_mask = mask;
 348
 349        return 0;
 350}
 351
 352static int max8997_get_voltage_sel(struct regulator_dev *rdev)
 353{
 354        struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 355        struct i2c_client *i2c = max8997->iodev->i2c;
 356        int reg, shift, mask, ret;
 357        u8 val;
 358
 359        ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
 360        if (ret)
 361                return ret;
 362
 363        ret = max8997_read_reg(i2c, reg, &val);
 364        if (ret)
 365                return ret;
 366
 367        val >>= shift;
 368        val &= mask;
 369
 370        return val;
 371}
 372
 373static inline int max8997_get_voltage_proper_val(
 374                const struct voltage_map_desc *desc,
 375                int min_vol, int max_vol)
 376{
 377        int i;
 378
 379        if (desc == NULL)
 380                return -EINVAL;
 381
 382        if (max_vol < desc->min || min_vol > desc->max)
 383                return -EINVAL;
 384
 385        if (min_vol < desc->min)
 386                min_vol = desc->min;
 387
 388        i = DIV_ROUND_UP(min_vol - desc->min, desc->step);
 389
 390        if (desc->min + desc->step * i > max_vol)
 391                return -EINVAL;
 392
 393        return i;
 394}
 395
 396static int max8997_set_voltage_charger_cv(struct regulator_dev *rdev,
 397                int min_uV, int max_uV, unsigned *selector)
 398{
 399        struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 400        struct i2c_client *i2c = max8997->iodev->i2c;
 401        int rid = rdev_get_id(rdev);
 402        int lb, ub;
 403        int reg, shift = 0, mask, ret = 0;
 404        u8 val = 0x0;
 405
 406        if (rid != MAX8997_CHARGER_CV)
 407                return -EINVAL;
 408
 409        ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
 410        if (ret)
 411                return ret;
 412
 413        if (max_uV < 4000000 || min_uV > 4350000)
 414                return -EINVAL;
 415
 416        if (min_uV <= 4000000)
 417                val = 0x1;
 418        else if (min_uV <= 4200000 && max_uV >= 4200000)
 419                val = 0x0;
 420        else {
 421                lb = (min_uV - 4000001) / 20000 + 2;
 422                ub = (max_uV - 4000000) / 20000 + 1;
 423
 424                if (lb > ub)
 425                        return -EINVAL;
 426
 427                if (lb < 0xf)
 428                        val = lb;
 429                else {
 430                        if (ub >= 0xf)
 431                                val = 0xf;
 432                        else
 433                                return -EINVAL;
 434                }
 435        }
 436
 437        *selector = val;
 438
 439        ret = max8997_update_reg(i2c, reg, val << shift, mask);
 440
 441        return ret;
 442}
 443
 444/*
 445 * For LDO1 ~ LDO21, BUCK1~5, BUCK7, CHARGER, CHARGER_TOPOFF
 446 * BUCK1, 2, and 5 are available if they are not controlled by gpio
 447 */
 448static int max8997_set_voltage_ldobuck(struct regulator_dev *rdev,
 449                int min_uV, int max_uV, unsigned *selector)
 450{
 451        struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 452        struct i2c_client *i2c = max8997->iodev->i2c;
 453        const struct voltage_map_desc *desc;
 454        int rid = rdev_get_id(rdev);
 455        int i, reg, shift, mask, ret;
 456
 457        switch (rid) {
 458        case MAX8997_LDO1 ... MAX8997_LDO21:
 459                break;
 460        case MAX8997_BUCK1 ... MAX8997_BUCK5:
 461                break;
 462        case MAX8997_BUCK6:
 463                return -EINVAL;
 464        case MAX8997_BUCK7:
 465                break;
 466        case MAX8997_CHARGER:
 467                break;
 468        case MAX8997_CHARGER_TOPOFF:
 469                break;
 470        default:
 471                return -EINVAL;
 472        }
 473
 474        desc = reg_voltage_map[rid];
 475
 476        i = max8997_get_voltage_proper_val(desc, min_uV, max_uV);
 477        if (i < 0)
 478                return i;
 479
 480        ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
 481        if (ret)
 482                return ret;
 483
 484        ret = max8997_update_reg(i2c, reg, i << shift, mask << shift);
 485        *selector = i;
 486
 487        return ret;
 488}
 489
 490static int max8997_set_voltage_buck_time_sel(struct regulator_dev *rdev,
 491                                                unsigned int old_selector,
 492                                                unsigned int new_selector)
 493{
 494        struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 495        int rid = rdev_get_id(rdev);
 496        const struct voltage_map_desc *desc = reg_voltage_map[rid];
 497
 498        /* Delay is required only if the voltage is increasing */
 499        if (old_selector >= new_selector)
 500                return 0;
 501
 502        /* No need to delay if gpio_dvs_mode */
 503        switch (rid) {
 504        case MAX8997_BUCK1:
 505                if (max8997->buck1_gpiodvs)
 506                        return 0;
 507                break;
 508        case MAX8997_BUCK2:
 509                if (max8997->buck2_gpiodvs)
 510                        return 0;
 511                break;
 512        case MAX8997_BUCK5:
 513                if (max8997->buck5_gpiodvs)
 514                        return 0;
 515                break;
 516        }
 517
 518        switch (rid) {
 519        case MAX8997_BUCK1:
 520        case MAX8997_BUCK2:
 521        case MAX8997_BUCK4:
 522        case MAX8997_BUCK5:
 523                return DIV_ROUND_UP(desc->step * (new_selector - old_selector),
 524                                    max8997->ramp_delay * 1000);
 525        }
 526
 527        return 0;
 528}
 529
 530/*
 531 * Assess the damage on the voltage setting of BUCK1,2,5 by the change.
 532 *
 533 * When GPIO-DVS mode is used for multiple bucks, changing the voltage value
 534 * of one of the bucks may affect that of another buck, which is the side
 535 * effect of the change (set_voltage). This function examines the GPIO-DVS
 536 * configurations and checks whether such side-effect exists.
 537 */
 538static int max8997_assess_side_effect(struct regulator_dev *rdev,
 539                u8 new_val, int *best)
 540{
 541        struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 542        int rid = rdev_get_id(rdev);
 543        u8 *buckx_val[3];
 544        bool buckx_gpiodvs[3];
 545        int side_effect[8];
 546        int min_side_effect = INT_MAX;
 547        int i;
 548
 549        *best = -1;
 550
 551        switch (rid) {
 552        case MAX8997_BUCK1:
 553                rid = 0;
 554                break;
 555        case MAX8997_BUCK2:
 556                rid = 1;
 557                break;
 558        case MAX8997_BUCK5:
 559                rid = 2;
 560                break;
 561        default:
 562                return -EINVAL;
 563        }
 564
 565        buckx_val[0] = max8997->buck1_vol;
 566        buckx_val[1] = max8997->buck2_vol;
 567        buckx_val[2] = max8997->buck5_vol;
 568        buckx_gpiodvs[0] = max8997->buck1_gpiodvs;
 569        buckx_gpiodvs[1] = max8997->buck2_gpiodvs;
 570        buckx_gpiodvs[2] = max8997->buck5_gpiodvs;
 571
 572        for (i = 0; i < 8; i++) {
 573                int others;
 574
 575                if (new_val != (buckx_val[rid])[i]) {
 576                        side_effect[i] = -1;
 577                        continue;
 578                }
 579
 580                side_effect[i] = 0;
 581                for (others = 0; others < 3; others++) {
 582                        int diff;
 583
 584                        if (others == rid)
 585                                continue;
 586                        if (buckx_gpiodvs[others] == false)
 587                                continue; /* Not affected */
 588                        diff = (buckx_val[others])[i] -
 589                                (buckx_val[others])[max8997->buck125_gpioindex];
 590                        if (diff > 0)
 591                                side_effect[i] += diff;
 592                        else if (diff < 0)
 593                                side_effect[i] -= diff;
 594                }
 595                if (side_effect[i] == 0) {
 596                        *best = i;
 597                        return 0; /* NO SIDE EFFECT! Use This! */
 598                }
 599                if (side_effect[i] < min_side_effect) {
 600                        min_side_effect = side_effect[i];
 601                        *best = i;
 602                }
 603        }
 604
 605        if (*best == -1)
 606                return -EINVAL;
 607
 608        return side_effect[*best];
 609}
 610
 611/*
 612 * For Buck 1 ~ 5 and 7. If it is not controlled by GPIO, this calls
 613 * max8997_set_voltage_ldobuck to do the job.
 614 */
 615static int max8997_set_voltage_buck(struct regulator_dev *rdev,
 616                int min_uV, int max_uV, unsigned *selector)
 617{
 618        struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 619        int rid = rdev_get_id(rdev);
 620        const struct voltage_map_desc *desc;
 621        int new_val, new_idx, damage, tmp_val, tmp_idx, tmp_dmg;
 622        bool gpio_dvs_mode = false;
 623
 624        if (rid < MAX8997_BUCK1 || rid > MAX8997_BUCK7)
 625                return -EINVAL;
 626
 627        switch (rid) {
 628        case MAX8997_BUCK1:
 629                if (max8997->buck1_gpiodvs)
 630                        gpio_dvs_mode = true;
 631                break;
 632        case MAX8997_BUCK2:
 633                if (max8997->buck2_gpiodvs)
 634                        gpio_dvs_mode = true;
 635                break;
 636        case MAX8997_BUCK5:
 637                if (max8997->buck5_gpiodvs)
 638                        gpio_dvs_mode = true;
 639                break;
 640        }
 641
 642        if (!gpio_dvs_mode)
 643                return max8997_set_voltage_ldobuck(rdev, min_uV, max_uV,
 644                                                selector);
 645
 646        desc = reg_voltage_map[rid];
 647        new_val = max8997_get_voltage_proper_val(desc, min_uV, max_uV);
 648        if (new_val < 0)
 649                return new_val;
 650
 651        tmp_dmg = INT_MAX;
 652        tmp_idx = -1;
 653        tmp_val = -1;
 654        do {
 655                damage = max8997_assess_side_effect(rdev, new_val, &new_idx);
 656                if (damage == 0)
 657                        goto out;
 658
 659                if (tmp_dmg > damage) {
 660                        tmp_idx = new_idx;
 661                        tmp_val = new_val;
 662                        tmp_dmg = damage;
 663                }
 664
 665                new_val++;
 666        } while (desc->min + desc->step * new_val <= desc->max);
 667
 668        new_idx = tmp_idx;
 669        new_val = tmp_val;
 670
 671        if (max8997->ignore_gpiodvs_side_effect == false)
 672                return -EINVAL;
 673
 674        dev_warn(&rdev->dev,
 675                "MAX8997 GPIO-DVS Side Effect Warning: GPIO SET:  %d -> %d\n",
 676                max8997->buck125_gpioindex, tmp_idx);
 677
 678out:
 679        if (new_idx < 0 || new_val < 0)
 680                return -EINVAL;
 681
 682        max8997->buck125_gpioindex = new_idx;
 683        max8997_set_gpio(max8997);
 684        *selector = new_val;
 685
 686        return 0;
 687}
 688
 689/* For SAFEOUT1 and SAFEOUT2 */
 690static int max8997_set_voltage_safeout_sel(struct regulator_dev *rdev,
 691                                           unsigned selector)
 692{
 693        struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 694        struct i2c_client *i2c = max8997->iodev->i2c;
 695        int rid = rdev_get_id(rdev);
 696        int reg, shift = 0, mask, ret;
 697
 698        if (rid != MAX8997_ESAFEOUT1 && rid != MAX8997_ESAFEOUT2)
 699                return -EINVAL;
 700
 701        ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
 702        if (ret)
 703                return ret;
 704
 705        return max8997_update_reg(i2c, reg, selector << shift, mask << shift);
 706}
 707
 708static int max8997_reg_disable_suspend(struct regulator_dev *rdev)
 709{
 710        struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 711        struct i2c_client *i2c = max8997->iodev->i2c;
 712        int ret, reg, mask, pattern;
 713        int rid = rdev_get_id(rdev);
 714
 715        ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
 716        if (ret)
 717                return ret;
 718
 719        max8997_read_reg(i2c, reg, &max8997->saved_states[rid]);
 720
 721        if (rid == MAX8997_LDO1 ||
 722                        rid == MAX8997_LDO10 ||
 723                        rid == MAX8997_LDO21) {
 724                dev_dbg(&rdev->dev, "Conditional Power-Off for %s\n",
 725                                rdev->desc->name);
 726                return max8997_update_reg(i2c, reg, 0x40, mask);
 727        }
 728
 729        dev_dbg(&rdev->dev, "Full Power-Off for %s (%xh -> %xh)\n",
 730                        rdev->desc->name, max8997->saved_states[rid] & mask,
 731                        (~pattern) & mask);
 732        return max8997_update_reg(i2c, reg, ~pattern, mask);
 733}
 734
 735static struct regulator_ops max8997_ldo_ops = {
 736        .list_voltage           = max8997_list_voltage,
 737        .is_enabled             = max8997_reg_is_enabled,
 738        .enable                 = max8997_reg_enable,
 739        .disable                = max8997_reg_disable,
 740        .get_voltage_sel        = max8997_get_voltage_sel,
 741        .set_voltage            = max8997_set_voltage_ldobuck,
 742        .set_suspend_disable    = max8997_reg_disable_suspend,
 743};
 744
 745static struct regulator_ops max8997_buck_ops = {
 746        .list_voltage           = max8997_list_voltage,
 747        .is_enabled             = max8997_reg_is_enabled,
 748        .enable                 = max8997_reg_enable,
 749        .disable                = max8997_reg_disable,
 750        .get_voltage_sel        = max8997_get_voltage_sel,
 751        .set_voltage            = max8997_set_voltage_buck,
 752        .set_voltage_time_sel   = max8997_set_voltage_buck_time_sel,
 753        .set_suspend_disable    = max8997_reg_disable_suspend,
 754};
 755
 756static struct regulator_ops max8997_fixedvolt_ops = {
 757        .list_voltage           = max8997_list_voltage,
 758        .is_enabled             = max8997_reg_is_enabled,
 759        .enable                 = max8997_reg_enable,
 760        .disable                = max8997_reg_disable,
 761        .set_suspend_disable    = max8997_reg_disable_suspend,
 762};
 763
 764static struct regulator_ops max8997_safeout_ops = {
 765        .list_voltage           = regulator_list_voltage_table,
 766        .is_enabled             = max8997_reg_is_enabled,
 767        .enable                 = max8997_reg_enable,
 768        .disable                = max8997_reg_disable,
 769        .get_voltage_sel        = max8997_get_voltage_sel,
 770        .set_voltage_sel        = max8997_set_voltage_safeout_sel,
 771        .set_suspend_disable    = max8997_reg_disable_suspend,
 772};
 773
 774static struct regulator_ops max8997_fixedstate_ops = {
 775        .list_voltage           = max8997_list_voltage_charger_cv,
 776        .get_voltage_sel        = max8997_get_voltage_sel,
 777        .set_voltage            = max8997_set_voltage_charger_cv,
 778};
 779
 780static int max8997_set_current_limit(struct regulator_dev *rdev,
 781                                     int min_uA, int max_uA)
 782{
 783        unsigned dummy;
 784        int rid = rdev_get_id(rdev);
 785
 786        if (rid != MAX8997_CHARGER && rid != MAX8997_CHARGER_TOPOFF)
 787                return -EINVAL;
 788
 789        /* Reuse max8997_set_voltage_ldobuck to set current_limit. */
 790        return max8997_set_voltage_ldobuck(rdev, min_uA, max_uA, &dummy);
 791}
 792
 793static int max8997_get_current_limit(struct regulator_dev *rdev)
 794{
 795        int sel, rid = rdev_get_id(rdev);
 796
 797        if (rid != MAX8997_CHARGER && rid != MAX8997_CHARGER_TOPOFF)
 798                return -EINVAL;
 799
 800        sel = max8997_get_voltage_sel(rdev);
 801        if (sel < 0)
 802                return sel;
 803
 804        /* Reuse max8997_list_voltage to get current_limit. */
 805        return max8997_list_voltage(rdev, sel);
 806}
 807
 808static struct regulator_ops max8997_charger_ops = {
 809        .is_enabled             = max8997_reg_is_enabled,
 810        .enable                 = max8997_reg_enable,
 811        .disable                = max8997_reg_disable,
 812        .get_current_limit      = max8997_get_current_limit,
 813        .set_current_limit      = max8997_set_current_limit,
 814};
 815
 816static struct regulator_ops max8997_charger_fixedstate_ops = {
 817        .get_current_limit      = max8997_get_current_limit,
 818        .set_current_limit      = max8997_set_current_limit,
 819};
 820
 821#define MAX8997_VOLTAGE_REGULATOR(_name, _ops) {\
 822        .name           = #_name,               \
 823        .id             = MAX8997_##_name,      \
 824        .ops            = &_ops,                \
 825        .type           = REGULATOR_VOLTAGE,    \
 826        .owner          = THIS_MODULE,          \
 827}
 828
 829#define MAX8997_CURRENT_REGULATOR(_name, _ops) {\
 830        .name           = #_name,               \
 831        .id             = MAX8997_##_name,      \
 832        .ops            = &_ops,                \
 833        .type           = REGULATOR_CURRENT,    \
 834        .owner          = THIS_MODULE,          \
 835}
 836
 837static struct regulator_desc regulators[] = {
 838        MAX8997_VOLTAGE_REGULATOR(LDO1, max8997_ldo_ops),
 839        MAX8997_VOLTAGE_REGULATOR(LDO2, max8997_ldo_ops),
 840        MAX8997_VOLTAGE_REGULATOR(LDO3, max8997_ldo_ops),
 841        MAX8997_VOLTAGE_REGULATOR(LDO4, max8997_ldo_ops),
 842        MAX8997_VOLTAGE_REGULATOR(LDO5, max8997_ldo_ops),
 843        MAX8997_VOLTAGE_REGULATOR(LDO6, max8997_ldo_ops),
 844        MAX8997_VOLTAGE_REGULATOR(LDO7, max8997_ldo_ops),
 845        MAX8997_VOLTAGE_REGULATOR(LDO8, max8997_ldo_ops),
 846        MAX8997_VOLTAGE_REGULATOR(LDO9, max8997_ldo_ops),
 847        MAX8997_VOLTAGE_REGULATOR(LDO10, max8997_ldo_ops),
 848        MAX8997_VOLTAGE_REGULATOR(LDO11, max8997_ldo_ops),
 849        MAX8997_VOLTAGE_REGULATOR(LDO12, max8997_ldo_ops),
 850        MAX8997_VOLTAGE_REGULATOR(LDO13, max8997_ldo_ops),
 851        MAX8997_VOLTAGE_REGULATOR(LDO14, max8997_ldo_ops),
 852        MAX8997_VOLTAGE_REGULATOR(LDO15, max8997_ldo_ops),
 853        MAX8997_VOLTAGE_REGULATOR(LDO16, max8997_ldo_ops),
 854        MAX8997_VOLTAGE_REGULATOR(LDO17, max8997_ldo_ops),
 855        MAX8997_VOLTAGE_REGULATOR(LDO18, max8997_ldo_ops),
 856        MAX8997_VOLTAGE_REGULATOR(LDO21, max8997_ldo_ops),
 857        MAX8997_VOLTAGE_REGULATOR(BUCK1, max8997_buck_ops),
 858        MAX8997_VOLTAGE_REGULATOR(BUCK2, max8997_buck_ops),
 859        MAX8997_VOLTAGE_REGULATOR(BUCK3, max8997_buck_ops),
 860        MAX8997_VOLTAGE_REGULATOR(BUCK4, max8997_buck_ops),
 861        MAX8997_VOLTAGE_REGULATOR(BUCK5, max8997_buck_ops),
 862        MAX8997_VOLTAGE_REGULATOR(BUCK6, max8997_fixedvolt_ops),
 863        MAX8997_VOLTAGE_REGULATOR(BUCK7, max8997_buck_ops),
 864        MAX8997_VOLTAGE_REGULATOR(EN32KHZ_AP, max8997_fixedvolt_ops),
 865        MAX8997_VOLTAGE_REGULATOR(EN32KHZ_CP, max8997_fixedvolt_ops),
 866        MAX8997_VOLTAGE_REGULATOR(ENVICHG, max8997_fixedvolt_ops),
 867        MAX8997_VOLTAGE_REGULATOR(ESAFEOUT1, max8997_safeout_ops),
 868        MAX8997_VOLTAGE_REGULATOR(ESAFEOUT2, max8997_safeout_ops),
 869        MAX8997_VOLTAGE_REGULATOR(CHARGER_CV, max8997_fixedstate_ops),
 870        MAX8997_CURRENT_REGULATOR(CHARGER, max8997_charger_ops),
 871        MAX8997_CURRENT_REGULATOR(CHARGER_TOPOFF,
 872                                  max8997_charger_fixedstate_ops),
 873};
 874
 875#ifdef CONFIG_OF
 876static int max8997_pmic_dt_parse_dvs_gpio(struct platform_device *pdev,
 877                        struct max8997_platform_data *pdata,
 878                        struct device_node *pmic_np)
 879{
 880        int i, gpio;
 881
 882        for (i = 0; i < 3; i++) {
 883                gpio = of_get_named_gpio(pmic_np,
 884                                        "max8997,pmic-buck125-dvs-gpios", i);
 885                if (!gpio_is_valid(gpio)) {
 886                        dev_err(&pdev->dev, "invalid gpio[%d]: %d\n", i, gpio);
 887                        return -EINVAL;
 888                }
 889                pdata->buck125_gpios[i] = gpio;
 890        }
 891        return 0;
 892}
 893
 894static int max8997_pmic_dt_parse_pdata(struct platform_device *pdev,
 895                                        struct max8997_platform_data *pdata)
 896{
 897        struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 898        struct device_node *pmic_np, *regulators_np, *reg_np;
 899        struct max8997_regulator_data *rdata;
 900        unsigned int i, dvs_voltage_nr = 1, ret;
 901
 902        pmic_np = iodev->dev->of_node;
 903        if (!pmic_np) {
 904                dev_err(&pdev->dev, "could not find pmic sub-node\n");
 905                return -ENODEV;
 906        }
 907
 908        regulators_np = of_get_child_by_name(pmic_np, "regulators");
 909        if (!regulators_np) {
 910                dev_err(&pdev->dev, "could not find regulators sub-node\n");
 911                return -EINVAL;
 912        }
 913
 914        /* count the number of regulators to be supported in pmic */
 915        pdata->num_regulators = of_get_child_count(regulators_np);
 916
 917        rdata = devm_kcalloc(&pdev->dev,
 918                             pdata->num_regulators, sizeof(*rdata),
 919                             GFP_KERNEL);
 920        if (!rdata) {
 921                of_node_put(regulators_np);
 922                return -ENOMEM;
 923        }
 924
 925        pdata->regulators = rdata;
 926        for_each_child_of_node(regulators_np, reg_np) {
 927                for (i = 0; i < ARRAY_SIZE(regulators); i++)
 928                        if (of_node_name_eq(reg_np, regulators[i].name))
 929                                break;
 930
 931                if (i == ARRAY_SIZE(regulators)) {
 932                        dev_warn(&pdev->dev, "don't know how to configure regulator %pOFn\n",
 933                                 reg_np);
 934                        continue;
 935                }
 936
 937                rdata->id = i;
 938                rdata->initdata = of_get_regulator_init_data(&pdev->dev,
 939                                                             reg_np,
 940                                                             &regulators[i]);
 941                rdata->reg_node = reg_np;
 942                rdata++;
 943        }
 944        of_node_put(regulators_np);
 945
 946        if (of_get_property(pmic_np, "max8997,pmic-buck1-uses-gpio-dvs", NULL))
 947                pdata->buck1_gpiodvs = true;
 948
 949        if (of_get_property(pmic_np, "max8997,pmic-buck2-uses-gpio-dvs", NULL))
 950                pdata->buck2_gpiodvs = true;
 951
 952        if (of_get_property(pmic_np, "max8997,pmic-buck5-uses-gpio-dvs", NULL))
 953                pdata->buck5_gpiodvs = true;
 954
 955        if (pdata->buck1_gpiodvs || pdata->buck2_gpiodvs ||
 956                                                pdata->buck5_gpiodvs) {
 957                ret = max8997_pmic_dt_parse_dvs_gpio(pdev, pdata, pmic_np);
 958                if (ret)
 959                        return -EINVAL;
 960
 961                if (of_property_read_u32(pmic_np,
 962                                "max8997,pmic-buck125-default-dvs-idx",
 963                                &pdata->buck125_default_idx)) {
 964                        pdata->buck125_default_idx = 0;
 965                } else {
 966                        if (pdata->buck125_default_idx >= 8) {
 967                                pdata->buck125_default_idx = 0;
 968                                dev_info(&pdev->dev, "invalid value for default dvs index, using 0 instead\n");
 969                        }
 970                }
 971
 972                if (of_get_property(pmic_np,
 973                        "max8997,pmic-ignore-gpiodvs-side-effect", NULL))
 974                        pdata->ignore_gpiodvs_side_effect = true;
 975
 976                dvs_voltage_nr = 8;
 977        }
 978
 979        if (of_property_read_u32_array(pmic_np,
 980                                "max8997,pmic-buck1-dvs-voltage",
 981                                pdata->buck1_voltage, dvs_voltage_nr)) {
 982                dev_err(&pdev->dev, "buck1 voltages not specified\n");
 983                return -EINVAL;
 984        }
 985
 986        if (of_property_read_u32_array(pmic_np,
 987                                "max8997,pmic-buck2-dvs-voltage",
 988                                pdata->buck2_voltage, dvs_voltage_nr)) {
 989                dev_err(&pdev->dev, "buck2 voltages not specified\n");
 990                return -EINVAL;
 991        }
 992
 993        if (of_property_read_u32_array(pmic_np,
 994                                "max8997,pmic-buck5-dvs-voltage",
 995                                pdata->buck5_voltage, dvs_voltage_nr)) {
 996                dev_err(&pdev->dev, "buck5 voltages not specified\n");
 997                return -EINVAL;
 998        }
 999
1000        return 0;
1001}
1002#else
1003static int max8997_pmic_dt_parse_pdata(struct platform_device *pdev,
1004                                        struct max8997_platform_data *pdata)
1005{
1006        return 0;
1007}
1008#endif /* CONFIG_OF */
1009
1010static int max8997_pmic_probe(struct platform_device *pdev)
1011{
1012        struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
1013        struct max8997_platform_data *pdata = iodev->pdata;
1014        struct regulator_config config = { };
1015        struct regulator_dev *rdev;
1016        struct max8997_data *max8997;
1017        struct i2c_client *i2c;
1018        int i, ret, nr_dvs;
1019        u8 max_buck1 = 0, max_buck2 = 0, max_buck5 = 0;
1020
1021        if (!pdata) {
1022                dev_err(&pdev->dev, "No platform init data supplied.\n");
1023                return -ENODEV;
1024        }
1025
1026        if (iodev->dev->of_node) {
1027                ret = max8997_pmic_dt_parse_pdata(pdev, pdata);
1028                if (ret)
1029                        return ret;
1030        }
1031
1032        max8997 = devm_kzalloc(&pdev->dev, sizeof(struct max8997_data),
1033                               GFP_KERNEL);
1034        if (!max8997)
1035                return -ENOMEM;
1036
1037        max8997->dev = &pdev->dev;
1038        max8997->iodev = iodev;
1039        max8997->num_regulators = pdata->num_regulators;
1040        platform_set_drvdata(pdev, max8997);
1041        i2c = max8997->iodev->i2c;
1042
1043        max8997->buck125_gpioindex = pdata->buck125_default_idx;
1044        max8997->buck1_gpiodvs = pdata->buck1_gpiodvs;
1045        max8997->buck2_gpiodvs = pdata->buck2_gpiodvs;
1046        max8997->buck5_gpiodvs = pdata->buck5_gpiodvs;
1047        memcpy(max8997->buck125_gpios, pdata->buck125_gpios, sizeof(int) * 3);
1048        max8997->ignore_gpiodvs_side_effect = pdata->ignore_gpiodvs_side_effect;
1049
1050        nr_dvs = (pdata->buck1_gpiodvs || pdata->buck2_gpiodvs ||
1051                        pdata->buck5_gpiodvs) ? 8 : 1;
1052
1053        for (i = 0; i < nr_dvs; i++) {
1054                max8997->buck1_vol[i] = ret =
1055                        max8997_get_voltage_proper_val(
1056                                        &buck1245_voltage_map_desc,
1057                                        pdata->buck1_voltage[i],
1058                                        pdata->buck1_voltage[i] +
1059                                        buck1245_voltage_map_desc.step);
1060                if (ret < 0)
1061                        return ret;
1062
1063                max8997->buck2_vol[i] = ret =
1064                        max8997_get_voltage_proper_val(
1065                                        &buck1245_voltage_map_desc,
1066                                        pdata->buck2_voltage[i],
1067                                        pdata->buck2_voltage[i] +
1068                                        buck1245_voltage_map_desc.step);
1069                if (ret < 0)
1070                        return ret;
1071
1072                max8997->buck5_vol[i] = ret =
1073                        max8997_get_voltage_proper_val(
1074                                        &buck1245_voltage_map_desc,
1075                                        pdata->buck5_voltage[i],
1076                                        pdata->buck5_voltage[i] +
1077                                        buck1245_voltage_map_desc.step);
1078                if (ret < 0)
1079                        return ret;
1080
1081                if (max_buck1 < max8997->buck1_vol[i])
1082                        max_buck1 = max8997->buck1_vol[i];
1083                if (max_buck2 < max8997->buck2_vol[i])
1084                        max_buck2 = max8997->buck2_vol[i];
1085                if (max_buck5 < max8997->buck5_vol[i])
1086                        max_buck5 = max8997->buck5_vol[i];
1087        }
1088
1089        /* For the safety, set max voltage before setting up */
1090        for (i = 0; i < 8; i++) {
1091                max8997_update_reg(i2c, MAX8997_REG_BUCK1DVS1 + i,
1092                                max_buck1, 0x3f);
1093                max8997_update_reg(i2c, MAX8997_REG_BUCK2DVS1 + i,
1094                                max_buck2, 0x3f);
1095                max8997_update_reg(i2c, MAX8997_REG_BUCK5DVS1 + i,
1096                                max_buck5, 0x3f);
1097        }
1098
1099        /* Initialize all the DVS related BUCK registers */
1100        for (i = 0; i < nr_dvs; i++) {
1101                max8997_update_reg(i2c, MAX8997_REG_BUCK1DVS1 + i,
1102                                max8997->buck1_vol[i],
1103                                0x3f);
1104                max8997_update_reg(i2c, MAX8997_REG_BUCK2DVS1 + i,
1105                                max8997->buck2_vol[i],
1106                                0x3f);
1107                max8997_update_reg(i2c, MAX8997_REG_BUCK5DVS1 + i,
1108                                max8997->buck5_vol[i],
1109                                0x3f);
1110        }
1111
1112        /*
1113         * If buck 1, 2, and 5 do not care DVS GPIO settings, ignore them.
1114         * If at least one of them cares, set gpios.
1115         */
1116        if (pdata->buck1_gpiodvs || pdata->buck2_gpiodvs ||
1117                        pdata->buck5_gpiodvs) {
1118
1119                if (!gpio_is_valid(pdata->buck125_gpios[0]) ||
1120                                !gpio_is_valid(pdata->buck125_gpios[1]) ||
1121                                !gpio_is_valid(pdata->buck125_gpios[2])) {
1122                        dev_err(&pdev->dev, "GPIO NOT VALID\n");
1123                        return -EINVAL;
1124                }
1125
1126                ret = devm_gpio_request(&pdev->dev, pdata->buck125_gpios[0],
1127                                        "MAX8997 SET1");
1128                if (ret)
1129                        return ret;
1130
1131                ret = devm_gpio_request(&pdev->dev, pdata->buck125_gpios[1],
1132                                        "MAX8997 SET2");
1133                if (ret)
1134                        return ret;
1135
1136                ret = devm_gpio_request(&pdev->dev, pdata->buck125_gpios[2],
1137                                "MAX8997 SET3");
1138                if (ret)
1139                        return ret;
1140
1141                gpio_direction_output(pdata->buck125_gpios[0],
1142                                (max8997->buck125_gpioindex >> 2)
1143                                & 0x1); /* SET1 */
1144                gpio_direction_output(pdata->buck125_gpios[1],
1145                                (max8997->buck125_gpioindex >> 1)
1146                                & 0x1); /* SET2 */
1147                gpio_direction_output(pdata->buck125_gpios[2],
1148                                (max8997->buck125_gpioindex >> 0)
1149                                & 0x1); /* SET3 */
1150        }
1151
1152        /* DVS-GPIO disabled */
1153        max8997_update_reg(i2c, MAX8997_REG_BUCK1CTRL, (pdata->buck1_gpiodvs) ?
1154                        (1 << 1) : (0 << 1), 1 << 1);
1155        max8997_update_reg(i2c, MAX8997_REG_BUCK2CTRL, (pdata->buck2_gpiodvs) ?
1156                        (1 << 1) : (0 << 1), 1 << 1);
1157        max8997_update_reg(i2c, MAX8997_REG_BUCK5CTRL, (pdata->buck5_gpiodvs) ?
1158                        (1 << 1) : (0 << 1), 1 << 1);
1159
1160        /* Misc Settings */
1161        max8997->ramp_delay = 10; /* set 10mV/us, which is the default */
1162        max8997_write_reg(i2c, MAX8997_REG_BUCKRAMP, (0xf << 4) | 0x9);
1163
1164        for (i = 0; i < pdata->num_regulators; i++) {
1165                const struct voltage_map_desc *desc;
1166                int id = pdata->regulators[i].id;
1167
1168                desc = reg_voltage_map[id];
1169                if (desc) {
1170                        regulators[id].n_voltages =
1171                                (desc->max - desc->min) / desc->step + 1;
1172                } else if (id == MAX8997_ESAFEOUT1 || id == MAX8997_ESAFEOUT2) {
1173                        regulators[id].volt_table = safeoutvolt;
1174                        regulators[id].n_voltages = ARRAY_SIZE(safeoutvolt);
1175                } else if (id == MAX8997_CHARGER_CV) {
1176                        regulators[id].n_voltages = 16;
1177                }
1178
1179                config.dev = max8997->dev;
1180                config.init_data = pdata->regulators[i].initdata;
1181                config.driver_data = max8997;
1182                config.of_node = pdata->regulators[i].reg_node;
1183
1184                rdev = devm_regulator_register(&pdev->dev, &regulators[id],
1185                                               &config);
1186                if (IS_ERR(rdev)) {
1187                        dev_err(max8997->dev, "regulator init failed for %d\n",
1188                                        id);
1189                        return PTR_ERR(rdev);
1190                }
1191        }
1192
1193        return 0;
1194}
1195
1196static const struct platform_device_id max8997_pmic_id[] = {
1197        { "max8997-pmic", 0},
1198        { },
1199};
1200MODULE_DEVICE_TABLE(platform, max8997_pmic_id);
1201
1202static struct platform_driver max8997_pmic_driver = {
1203        .driver = {
1204                .name = "max8997-pmic",
1205        },
1206        .probe = max8997_pmic_probe,
1207        .id_table = max8997_pmic_id,
1208};
1209
1210static int __init max8997_pmic_init(void)
1211{
1212        return platform_driver_register(&max8997_pmic_driver);
1213}
1214subsys_initcall(max8997_pmic_init);
1215
1216static void __exit max8997_pmic_cleanup(void)
1217{
1218        platform_driver_unregister(&max8997_pmic_driver);
1219}
1220module_exit(max8997_pmic_cleanup);
1221
1222MODULE_DESCRIPTION("MAXIM 8997/8966 Regulator Driver");
1223MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
1224MODULE_LICENSE("GPL");
1225