drivers/regulator/max8998.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 //
   3 // max8998.c - Voltage regulator driver for the Maxim 8998
   4 //
   5 //  Copyright (C) 2009-2010 Samsung Electronics
   6 //  Kyungmin Park <kyungmin.park@samsung.com>
   7 //  Marek Szyprowski <m.szyprowski@samsung.com>
   8
   9 #include <linux/module.h>
  10 #include <linux/init.h>
  11 #include <linux/i2c.h>
  12 #include <linux/err.h>
  13 #include <linux/gpio.h>
  14 #include <linux/slab.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/mutex.h>
  17 #include <linux/of.h>
  18 #include <linux/of_gpio.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/regulator/driver.h>
  21 #include <linux/regulator/of_regulator.h>
  22 #include <linux/mfd/max8998.h>
  23 #include <linux/mfd/max8998-private.h>
  24
  25 struct max8998_data {
  26         struct device           *dev;
  27         struct max8998_dev      *iodev;
  28         int                     num_regulators;
  29         u8                      buck1_vol[4]; /* voltages for selection */
  30         u8                      buck2_vol[2];
  31         unsigned int            buck1_idx; /* index to last changed voltage */
  32                                            /* value in a set */
  33         unsigned int            buck2_idx;
  34 };
  35
  36 static const unsigned int charger_current_table[] = {
  37         90000, 380000, 475000, 550000, 570000, 600000, 700000, 800000,
  38 };
  39
  40 static int max8998_get_enable_register(struct regulator_dev *rdev,
  41                                         int *reg, int *shift)
  42 {
  43         int ldo = rdev_get_id(rdev);
  44
  45         switch (ldo) {
  46         case MAX8998_LDO2 ... MAX8998_LDO5:
  47                 *reg = MAX8998_REG_ONOFF1;
  48                 *shift = 3 - (ldo - MAX8998_LDO2);
  49                 break;
  50         case MAX8998_LDO6 ... MAX8998_LDO13:
  51                 *reg = MAX8998_REG_ONOFF2;
  52                 *shift = 7 - (ldo - MAX8998_LDO6);
  53                 break;
  54         case MAX8998_LDO14 ... MAX8998_LDO17:
  55                 *reg = MAX8998_REG_ONOFF3;
  56                 *shift = 7 - (ldo - MAX8998_LDO14);
  57                 break;
  58         case MAX8998_BUCK1 ... MAX8998_BUCK4:
  59                 *reg = MAX8998_REG_ONOFF1;
  60                 *shift = 7 - (ldo - MAX8998_BUCK1);
  61                 break;
  62         case MAX8998_EN32KHZ_AP ... MAX8998_ENVICHG:
  63                 *reg = MAX8998_REG_ONOFF4;
  64                 *shift = 7 - (ldo - MAX8998_EN32KHZ_AP);
  65                 break;
  66         case MAX8998_ESAFEOUT1 ... MAX8998_ESAFEOUT2:
  67                 *reg = MAX8998_REG_CHGR2;
  68                 *shift = 7 - (ldo - MAX8998_ESAFEOUT1);
  69                 break;
  70         case MAX8998_CHARGER:
  71                 *reg = MAX8998_REG_CHGR2;
  72                 *shift = 0;
  73                 break;
  74         default:
  75                 return -EINVAL;
  76         }
  77
  78         return 0;
  79 }
  80
  81 static int max8998_ldo_is_enabled(struct regulator_dev *rdev)
  82 {
  83         struct max8998_data *max8998 = rdev_get_drvdata(rdev);
  84         struct i2c_client *i2c = max8998->iodev->i2c;
  85         int ret, reg, shift = 8;
  86         u8 val;
  87
  88         ret = max8998_get_enable_register(rdev, &reg, &shift);
  89         if (ret)
  90                 return ret;
  91
  92         ret = max8998_read_reg(i2c, reg, &val);
  93         if (ret)
  94                 return ret;
  95
  96         return val & (1 << shift);
  97 }
  98
  99 static int max8998_ldo_is_enabled_inverted(struct regulator_dev *rdev)
 100 {
 101         return (!max8998_ldo_is_enabled(rdev));
 102 }
 103
 104 static int max8998_ldo_enable(struct regulator_dev *rdev)
 105 {
 106         struct max8998_data *max8998 = rdev_get_drvdata(rdev);
 107         struct i2c_client *i2c = max8998->iodev->i2c;
 108         int reg, shift = 8, ret;
 109
 110         ret = max8998_get_enable_register(rdev, &reg, &shift);
 111         if (ret)
 112                 return ret;
 113
 114         return max8998_update_reg(i2c, reg, 1<<shift, 1<<shift);
 115 }
 116
 117 static int max8998_ldo_disable(struct regulator_dev *rdev)
 118 {
 119         struct max8998_data *max8998 = rdev_get_drvdata(rdev);
 120         struct i2c_client *i2c = max8998->iodev->i2c;
 121         int reg, shift = 8, ret;
 122
 123         ret = max8998_get_enable_register(rdev, &reg, &shift);
 124         if (ret)
 125                 return ret;
 126
 127         return max8998_update_reg(i2c, reg, 0, 1<<shift);
 128 }
 129
 130 static int max8998_get_voltage_register(struct regulator_dev *rdev,
 131                                 int *_reg, int *_shift, int *_mask)
 132 {
 133         int ldo = rdev_get_id(rdev);
 134         struct max8998_data *max8998 = rdev_get_drvdata(rdev);
 135         int reg, shift = 0, mask = 0xff;
 136
 137         switch (ldo) {
 138         case MAX8998_LDO2 ... MAX8998_LDO3:
 139                 reg = MAX8998_REG_LDO2_LDO3;
 140                 mask = 0xf;
 141                 if (ldo == MAX8998_LDO2)
 142                         shift = 4;
 143                 else
 144                         shift = 0;
 145                 break;
 146         case MAX8998_LDO4 ... MAX8998_LDO7:
 147                 reg = MAX8998_REG_LDO4 + (ldo - MAX8998_LDO4);
 148                 break;
 149         case MAX8998_LDO8 ... MAX8998_LDO9:
 150                 reg = MAX8998_REG_LDO8_LDO9;
 151                 mask = 0xf;
 152                 if (ldo == MAX8998_LDO8)
 153                         shift = 4;
 154                 else
 155                         shift = 0;
 156                 break;
 157         case MAX8998_LDO10 ... MAX8998_LDO11:
 158                 reg = MAX8998_REG_LDO10_LDO11;
 159                 if (ldo == MAX8998_LDO10) {
 160                         shift = 5;
 161                         mask = 0x7;
 162                 } else {
 163                         shift = 0;
 164                         mask = 0x1f;
 165                 }
 166                 break;
 167         case MAX8998_LDO12 ... MAX8998_LDO17:
 168                 reg = MAX8998_REG_LDO12 + (ldo - MAX8998_LDO12);
 169                 break;
 170         case MAX8998_BUCK1:
 171                 reg = MAX8998_REG_BUCK1_VOLTAGE1 + max8998->buck1_idx;
 172                 break;
 173         case MAX8998_BUCK2:
 174                 reg = MAX8998_REG_BUCK2_VOLTAGE1 + max8998->buck2_idx;
 175                 break;
 176         case MAX8998_BUCK3:
 177                 reg = MAX8998_REG_BUCK3;
 178                 break;
 179         case MAX8998_BUCK4:
 180                 reg = MAX8998_REG_BUCK4;
 181                 break;
 182         default:
 183                 return -EINVAL;
 184         }
 185
 186         *_reg = reg;
 187         *_shift = shift;
 188         *_mask = mask;
 189
 190         return 0;
 191 }
 192
 193 static int max8998_get_voltage_sel(struct regulator_dev *rdev)
 194 {
 195         struct max8998_data *max8998 = rdev_get_drvdata(rdev);
 196         struct i2c_client *i2c = max8998->iodev->i2c;
 197         int reg, shift = 0, mask, ret;
 198         u8 val;
 199
 200         ret = max8998_get_voltage_register(rdev, &reg, &shift, &mask);
 201         if (ret)
 202                 return ret;
 203
 204         ret = max8998_read_reg(i2c, reg, &val);
 205         if (ret)
 206                 return ret;
 207
 208         val >>= shift;
 209         val &= mask;
 210
 211         return val;
 212 }
 213
 214 static int max8998_set_voltage_ldo_sel(struct regulator_dev *rdev,
 215                                        unsigned selector)
 216 {
 217         struct max8998_data *max8998 = rdev_get_drvdata(rdev);
 218         struct i2c_client *i2c = max8998->iodev->i2c;
 219         int reg, shift = 0, mask, ret;
 220
 221         ret = max8998_get_voltage_register(rdev, &reg, &shift, &mask);
 222         if (ret)
 223                 return ret;
 224
 225         ret = max8998_update_reg(i2c, reg, selector<<shift, mask<<shift);
 226
 227         return ret;
 228 }
 229
 230 static inline void buck1_gpio_set(int gpio1, int gpio2, int v)
 231 {
 232         gpio_set_value(gpio1, v & 0x1);
 233         gpio_set_value(gpio2, (v >> 1) & 0x1);
 234 }
 235
 236 static inline void buck2_gpio_set(int gpio, int v)
 237 {
 238         gpio_set_value(gpio, v & 0x1);
 239 }
 240
 241 static int max8998_set_voltage_buck_sel(struct regulator_dev *rdev,
 242                                         unsigned selector)
 243 {
 244         struct max8998_data *max8998 = rdev_get_drvdata(rdev);
 245         struct max8998_platform_data *pdata = max8998->iodev->pdata;
 246         struct i2c_client *i2c = max8998->iodev->i2c;
 247         int buck = rdev_get_id(rdev);
 248         int reg, shift = 0, mask, ret, j;
 249         static u8 buck1_last_val;
 250
 251         ret = max8998_get_voltage_register(rdev, &reg, &shift, &mask);
 252         if (ret)
 253                 return ret;
 254
 255         switch (buck) {
 256         case MAX8998_BUCK1:
 257                 dev_dbg(max8998->dev,
 258                         "BUCK1, selector:%d, buck1_vol1:%d, buck1_vol2:%d\n"
 259                         "buck1_vol3:%d, buck1_vol4:%d\n",
 260                         selector, max8998->buck1_vol[0], max8998->buck1_vol[1],
 261                         max8998->buck1_vol[2], max8998->buck1_vol[3]);
 262
 263                 if (gpio_is_valid(pdata->buck1_set1) &&
 264                     gpio_is_valid(pdata->buck1_set2)) {
 265
 266                         /* check if requested voltage */
 267                         /* value is already defined */
 268                         for (j = 0; j < ARRAY_SIZE(max8998->buck1_vol); j++) {
 269                                 if (max8998->buck1_vol[j] == selector) {
 270                                         max8998->buck1_idx = j;
 271                                         buck1_gpio_set(pdata->buck1_set1,
 272                                                        pdata->buck1_set2, j);
 273                                         goto buck1_exit;
 274                                 }
 275                         }
 276
 277                         if (pdata->buck_voltage_lock)
 278                                 return -EINVAL;
 279
 280                         /* no predefine regulator found */
 281                         max8998->buck1_idx = (buck1_last_val % 2) + 2;
 282                         dev_dbg(max8998->dev, "max8998->buck1_idx:%d\n",
 283                                 max8998->buck1_idx);
 284                         max8998->buck1_vol[max8998->buck1_idx] = selector;
 285                         ret = max8998_get_voltage_register(rdev, &reg,
 286                                                            &shift,
 287                                                            &mask);
 288                         ret = max8998_write_reg(i2c, reg, selector);
 289                         buck1_gpio_set(pdata->buck1_set1,
 290                                        pdata->buck1_set2, max8998->buck1_idx);
 291                         buck1_last_val++;
 292 buck1_exit:
 293                         dev_dbg(max8998->dev, "%s: SET1:%d, SET2:%d\n",
 294                                 i2c->name, gpio_get_value(pdata->buck1_set1),
 295                                 gpio_get_value(pdata->buck1_set2));
 296                         break;
 297                 } else {
 298                         ret = max8998_write_reg(i2c, reg, selector);
 299                 }
 300                 break;
 301
 302         case MAX8998_BUCK2:
 303                 dev_dbg(max8998->dev,
 304                         "BUCK2, selector:%d buck2_vol1:%d, buck2_vol2:%d\n",
 305                         selector, max8998->buck2_vol[0], max8998->buck2_vol[1]);
 306                 if (gpio_is_valid(pdata->buck2_set3)) {
 307
 308                         /* check if requested voltage */
 309                         /* value is already defined */
 310                         for (j = 0; j < ARRAY_SIZE(max8998->buck2_vol); j++) {
 311                                 if (max8998->buck2_vol[j] == selector) {
 312                                         max8998->buck2_idx = j;
 313                                         buck2_gpio_set(pdata->buck2_set3, j);
 314                                         goto buck2_exit;
 315                                 }
 316                         }
 317
 318                         if (pdata->buck_voltage_lock)
 319                                 return -EINVAL;
 320
 321                         max8998_get_voltage_register(rdev,
 322                                         &reg, &shift, &mask);
 323                         ret = max8998_write_reg(i2c, reg, selector);
 324                         max8998->buck2_vol[max8998->buck2_idx] = selector;
 325                         buck2_gpio_set(pdata->buck2_set3, max8998->buck2_idx);
 326 buck2_exit:
 327                         dev_dbg(max8998->dev, "%s: SET3:%d\n", i2c->name,
 328                                 gpio_get_value(pdata->buck2_set3));
 329                 } else {
 330                         ret = max8998_write_reg(i2c, reg, selector);
 331                 }
 332                 break;
 333
 334         case MAX8998_BUCK3:
 335         case MAX8998_BUCK4:
 336                 ret = max8998_update_reg(i2c, reg, selector<<shift,
 337                                          mask<<shift);
 338                 break;
 339         }
 340
 341         return ret;
 342 }
 343
 344 static int max8998_set_voltage_buck_time_sel(struct regulator_dev *rdev,
 345                                              unsigned int old_selector,
 346                                              unsigned int new_selector)
 347 {
 348         struct max8998_data *max8998 = rdev_get_drvdata(rdev);
 349         struct i2c_client *i2c = max8998->iodev->i2c;
 350         int buck = rdev_get_id(rdev);
 351         u8 val = 0;
 352         int difference, ret;
 353
 354         if (buck < MAX8998_BUCK1 || buck > MAX8998_BUCK4)
 355                 return -EINVAL;
 356
 357         /* Voltage stabilization */
 358         ret = max8998_read_reg(i2c, MAX8998_REG_ONOFF4, &val);
 359         if (ret)
 360                 return ret;
 361
 362         /* lp3974 hasn't got ENRAMP bit - ramp is assumed as true */
 363         /* MAX8998 has ENRAMP bit implemented, so test it*/
 364         if (max8998->iodev->type == TYPE_MAX8998 && !(val & MAX8998_ENRAMP))
 365                 return 0;
 366
 367         difference = (new_selector - old_selector) * rdev->desc->uV_step / 1000;
 368         if (difference > 0)
 369                 return DIV_ROUND_UP(difference, (val & 0x0f) + 1);
 370
 371         return 0;
 372 }
 373
 374 static int max8998_set_current_limit(struct regulator_dev *rdev,
 375                                      int min_uA, int max_uA)
 376 {
 377         struct max8998_data *max8998 = rdev_get_drvdata(rdev);
 378         struct i2c_client *i2c = max8998->iodev->i2c;
 379         unsigned int n_currents = rdev->desc->n_current_limits;
 380         int i, sel = -1;
 381
 382         if (n_currents == 0)
 383                 return -EINVAL;
 384
 385         if (rdev->desc->curr_table) {
 386                 const unsigned int *curr_table = rdev->desc->curr_table;
 387                 bool ascend = curr_table[n_currents - 1] > curr_table[0];
 388
 389                 /* search for closest to maximum */
 390                 if (ascend) {
 391                         for (i = n_currents - 1; i >= 0; i--) {
 392                                 if (min_uA <= curr_table[i] &&
 393                                     curr_table[i] <= max_uA) {
 394                                         sel = i;
 395                                         break;
 396                                 }
 397                         }
 398                 } else {
 399                         for (i = 0; i < n_currents; i++) {
 400                                 if (min_uA <= curr_table[i] &&
 401                                     curr_table[i] <= max_uA) {
 402                                         sel = i;
 403                                         break;
 404                                 }
 405                         }
 406                 }
 407         }
 408
 409         if (sel < 0)
 410                 return -EINVAL;
 411
 412         sel <<= ffs(rdev->desc->csel_mask) - 1;
 413
 414         return max8998_update_reg(i2c, rdev->desc->csel_reg,
 415                                   sel, rdev->desc->csel_mask);
 416 }
 417
 418 static int max8998_get_current_limit(struct regulator_dev *rdev)
 419 {
 420         struct max8998_data *max8998 = rdev_get_drvdata(rdev);
 421         struct i2c_client *i2c = max8998->iodev->i2c;
 422         u8 val;
 423         int ret;
 424
 425         ret = max8998_read_reg(i2c, rdev->desc->csel_reg, &val);
 426         if (ret != 0)
 427                 return ret;
 428
 429         val &= rdev->desc->csel_mask;
 430         val >>= ffs(rdev->desc->csel_mask) - 1;
 431
 432         if (rdev->desc->curr_table) {
 433                 if (val >= rdev->desc->n_current_limits)
 434                         return -EINVAL;
 435
 436                 return rdev->desc->curr_table[val];
 437         }
 438
 439         return -EINVAL;
 440 }
 441
 442 static const struct regulator_ops max8998_ldo_ops = {
 443         .list_voltage           = regulator_list_voltage_linear,
 444         .map_voltage            = regulator_map_voltage_linear,
 445         .is_enabled             = max8998_ldo_is_enabled,
 446         .enable                 = max8998_ldo_enable,
 447         .disable                = max8998_ldo_disable,
 448         .get_voltage_sel        = max8998_get_voltage_sel,
 449         .set_voltage_sel        = max8998_set_voltage_ldo_sel,
 450 };
 451
 452 static const struct regulator_ops max8998_buck_ops = {
 453         .list_voltage           = regulator_list_voltage_linear,
 454         .map_voltage            = regulator_map_voltage_linear,
 455         .is_enabled             = max8998_ldo_is_enabled,
 456         .enable                 = max8998_ldo_enable,
 457         .disable                = max8998_ldo_disable,
 458         .get_voltage_sel        = max8998_get_voltage_sel,
 459         .set_voltage_sel        = max8998_set_voltage_buck_sel,
 460         .set_voltage_time_sel   = max8998_set_voltage_buck_time_sel,
 461 };
 462
 463 static const struct regulator_ops max8998_charger_ops = {
 464         .set_current_limit      = max8998_set_current_limit,
 465         .get_current_limit      = max8998_get_current_limit,
 466         .is_enabled             = max8998_ldo_is_enabled_inverted,
 467         /* Swapped as register is inverted */
 468         .enable                 = max8998_ldo_disable,
 469         .disable                = max8998_ldo_enable,
 470 };
 471
 472 static const struct regulator_ops max8998_others_ops = {
 473         .is_enabled             = max8998_ldo_is_enabled,
 474         .enable                 = max8998_ldo_enable,
 475         .disable                = max8998_ldo_disable,
 476 };
 477
 478 #define MAX8998_LINEAR_REG(_name, _ops, _min, _step, _max) \
 479         { \
 480                 .name = #_name, \
 481                 .id = MAX8998_##_name, \
 482                 .ops = _ops, \
 483                 .min_uV = (_min), \
 484                 .uV_step = (_step), \
 485                 .n_voltages = ((_max) - (_min)) / (_step) + 1, \
 486                 .type = REGULATOR_VOLTAGE, \
 487                 .owner = THIS_MODULE, \
 488         }
 489
 490 #define MAX8998_CURRENT_REG(_name, _ops, _table, _reg, _mask) \
 491         { \
 492                 .name = #_name, \
 493                 .id = MAX8998_##_name, \
 494                 .ops = _ops, \
 495                 .curr_table = _table, \
 496                 .n_current_limits = ARRAY_SIZE(_table), \
 497                 .csel_reg = _reg, \
 498                 .csel_mask = _mask, \
 499                 .type = REGULATOR_CURRENT, \
 500                 .owner = THIS_MODULE, \
 501         }
 502
 503 #define MAX8998_OTHERS_REG(_name, _id) \
 504         { \
 505                 .name = #_name, \
 506                 .id = _id, \
 507                 .ops = &max8998_others_ops, \
 508                 .type = REGULATOR_VOLTAGE, \
 509                 .owner = THIS_MODULE, \
 510         }
 511
 512 static const struct regulator_desc regulators[] = {
 513         MAX8998_LINEAR_REG(LDO2, &max8998_ldo_ops, 800000, 50000, 1300000),
 514         MAX8998_LINEAR_REG(LDO3, &max8998_ldo_ops, 800000, 50000, 1300000),
 515         MAX8998_LINEAR_REG(LDO4, &max8998_ldo_ops, 1600000, 100000, 3600000),
 516         MAX8998_LINEAR_REG(LDO5, &max8998_ldo_ops, 1600000, 100000, 3600000),
 517         MAX8998_LINEAR_REG(LDO6, &max8998_ldo_ops, 1600000, 100000, 3600000),
 518         MAX8998_LINEAR_REG(LDO7, &max8998_ldo_ops, 1600000, 100000, 3600000),
 519         MAX8998_LINEAR_REG(LDO8, &max8998_ldo_ops, 3000000, 100000, 3600000),
 520         MAX8998_LINEAR_REG(LDO9, &max8998_ldo_ops, 2800000, 100000, 3100000),
 521         MAX8998_LINEAR_REG(LDO10, &max8998_ldo_ops, 950000, 50000, 1300000),
 522         MAX8998_LINEAR_REG(LDO11, &max8998_ldo_ops, 1600000, 100000, 3600000),
 523         MAX8998_LINEAR_REG(LDO12, &max8998_ldo_ops, 800000, 100000, 3300000),
 524         MAX8998_LINEAR_REG(LDO13, &max8998_ldo_ops, 800000, 100000, 3300000),
 525         MAX8998_LINEAR_REG(LDO14, &max8998_ldo_ops, 1200000, 100000, 3300000),
 526         MAX8998_LINEAR_REG(LDO15, &max8998_ldo_ops, 1200000, 100000, 3300000),
 527         MAX8998_LINEAR_REG(LDO16, &max8998_ldo_ops, 1600000, 100000, 3600000),
 528         MAX8998_LINEAR_REG(LDO17, &max8998_ldo_ops, 1600000, 100000, 3600000),
 529         MAX8998_LINEAR_REG(BUCK1, &max8998_buck_ops, 750000, 25000, 1525000),
 530         MAX8998_LINEAR_REG(BUCK2, &max8998_buck_ops, 750000, 25000, 1525000),
 531         MAX8998_LINEAR_REG(BUCK3, &max8998_buck_ops, 1600000, 100000, 3600000),
 532         MAX8998_LINEAR_REG(BUCK4, &max8998_buck_ops, 800000, 100000, 2300000),
 533         MAX8998_OTHERS_REG(EN32KHz-AP, MAX8998_EN32KHZ_AP),
 534         MAX8998_OTHERS_REG(EN32KHz-CP, MAX8998_EN32KHZ_CP),
 535         MAX8998_OTHERS_REG(ENVICHG, MAX8998_ENVICHG),
 536         MAX8998_OTHERS_REG(ESAFEOUT1, MAX8998_ESAFEOUT1),
 537         MAX8998_OTHERS_REG(ESAFEOUT2, MAX8998_ESAFEOUT2),
 538         MAX8998_CURRENT_REG(CHARGER, &max8998_charger_ops,
 539                             charger_current_table, MAX8998_REG_CHGR1, 0x7),
 540 };
 541
 542 static int max8998_pmic_dt_parse_dvs_gpio(struct max8998_dev *iodev,
 543                         struct max8998_platform_data *pdata,
 544                         struct device_node *pmic_np)
 545 {
 546         int gpio;
 547
 548         gpio = of_get_named_gpio(pmic_np, "max8998,pmic-buck1-dvs-gpios", 0);
 549         if (!gpio_is_valid(gpio)) {
 550                 dev_err(iodev->dev, "invalid buck1 gpio[0]: %d\n", gpio);
 551                 return -EINVAL;
 552         }
 553         pdata->buck1_set1 = gpio;
 554
 555         gpio = of_get_named_gpio(pmic_np, "max8998,pmic-buck1-dvs-gpios", 1);
 556         if (!gpio_is_valid(gpio)) {
 557                 dev_err(iodev->dev, "invalid buck1 gpio[1]: %d\n", gpio);
 558                 return -EINVAL;
 559         }
 560         pdata->buck1_set2 = gpio;
 561
 562         gpio = of_get_named_gpio(pmic_np, "max8998,pmic-buck2-dvs-gpio", 0);
 563         if (!gpio_is_valid(gpio)) {
 564                 dev_err(iodev->dev, "invalid buck 2 gpio: %d\n", gpio);
 565                 return -EINVAL;
 566         }
 567         pdata->buck2_set3 = gpio;
 568
 569         return 0;
 570 }
 571
 572 static int max8998_pmic_dt_parse_pdata(struct max8998_dev *iodev,
 573                                         struct max8998_platform_data *pdata)
 574 {
 575         struct device_node *pmic_np = iodev->dev->of_node;
 576         struct device_node *regulators_np, *reg_np;
 577         struct max8998_regulator_data *rdata;
 578         unsigned int i;
 579         int ret;
 580
 581         regulators_np = of_get_child_by_name(pmic_np, "regulators");
 582         if (!regulators_np) {
 583                 dev_err(iodev->dev, "could not find regulators sub-node\n");
 584                 return -EINVAL;
 585         }
 586
 587         /* count the number of regulators to be supported in pmic */
 588         pdata->num_regulators = of_get_child_count(regulators_np);
 589
 590         rdata = devm_kcalloc(iodev->dev,
 591                              pdata->num_regulators, sizeof(*rdata),
 592                              GFP_KERNEL);
 593         if (!rdata) {
 594                 of_node_put(regulators_np);
 595                 return -ENOMEM;
 596         }
 597
 598         pdata->regulators = rdata;
 599         for (i = 0; i < ARRAY_SIZE(regulators); ++i) {
 600                 reg_np = of_get_child_by_name(regulators_np,
 601                                                         regulators[i].name);
 602                 if (!reg_np)
 603                         continue;
 604
 605                 rdata->id = regulators[i].id;
 606                 rdata->initdata = of_get_regulator_init_data(iodev->dev,
 607                                                              reg_np,
 608                                                              &regulators[i]);
 609                 rdata->reg_node = reg_np;
 610                 ++rdata;
 611         }
 612         pdata->num_regulators = rdata - pdata->regulators;
 613
 614         of_node_put(reg_np);
 615         of_node_put(regulators_np);
 616
 617         ret = max8998_pmic_dt_parse_dvs_gpio(iodev, pdata, pmic_np);
 618         if (ret)
 619                 return -EINVAL;
 620
 621         if (of_find_property(pmic_np, "max8998,pmic-buck-voltage-lock", NULL))
 622                 pdata->buck_voltage_lock = true;
 623
 624         ret = of_property_read_u32(pmic_np,
 625                                         "max8998,pmic-buck1-default-dvs-idx",
 626                                         &pdata->buck1_default_idx);
 627         if (!ret && pdata->buck1_default_idx >= 4) {
 628                 pdata->buck1_default_idx = 0;
 629                 dev_warn(iodev->dev, "invalid value for default dvs index, using 0 instead\n");
 630         }
 631
 632         ret = of_property_read_u32(pmic_np,
 633                                         "max8998,pmic-buck2-default-dvs-idx",
 634                                         &pdata->buck2_default_idx);
 635         if (!ret && pdata->buck2_default_idx >= 2) {
 636                 pdata->buck2_default_idx = 0;
 637                 dev_warn(iodev->dev, "invalid value for default dvs index, using 0 instead\n");
 638         }
 639
 640         ret = of_property_read_u32_array(pmic_np,
 641                                         "max8998,pmic-buck1-dvs-voltage",
 642                                         pdata->buck1_voltage,
 643                                         ARRAY_SIZE(pdata->buck1_voltage));
 644         if (ret) {
 645                 dev_err(iodev->dev, "buck1 voltages not specified\n");
 646                 return -EINVAL;
 647         }
 648
 649         ret = of_property_read_u32_array(pmic_np,
 650                                         "max8998,pmic-buck2-dvs-voltage",
 651                                         pdata->buck2_voltage,
 652                                         ARRAY_SIZE(pdata->buck2_voltage));
 653         if (ret) {
 654                 dev_err(iodev->dev, "buck2 voltages not specified\n");
 655                 return -EINVAL;
 656         }
 657
 658         return 0;
 659 }
 660
 661 static int max8998_pmic_probe(struct platform_device *pdev)
 662 {
 663         struct max8998_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 664         struct max8998_platform_data *pdata = iodev->pdata;
 665         struct regulator_config config = { };
 666         struct regulator_dev *rdev;
 667         struct max8998_data *max8998;
 668         struct i2c_client *i2c;
 669         int i, ret;
 670         unsigned int v;
 671
 672         if (!pdata) {
 673                 dev_err(pdev->dev.parent, "No platform init data supplied\n");
 674                 return -ENODEV;
 675         }
 676
 677         if (IS_ENABLED(CONFIG_OF) && iodev->dev->of_node) {
 678                 ret = max8998_pmic_dt_parse_pdata(iodev, pdata);
 679                 if (ret)
 680                         return ret;
 681         }
 682
 683         max8998 = devm_kzalloc(&pdev->dev, sizeof(struct max8998_data),
 684                                GFP_KERNEL);
 685         if (!max8998)
 686                 return -ENOMEM;
 687
 688         max8998->dev = &pdev->dev;
 689         max8998->iodev = iodev;
 690         max8998->num_regulators = pdata->num_regulators;
 691         platform_set_drvdata(pdev, max8998);
 692         i2c = max8998->iodev->i2c;
 693
 694         max8998->buck1_idx = pdata->buck1_default_idx;
 695         max8998->buck2_idx = pdata->buck2_default_idx;
 696
 697         /* NOTE: */
 698         /* For unused GPIO NOT marked as -1 (thereof equal to 0)  WARN_ON */
 699         /* will be displayed */
 700
 701         /* Check if MAX8998 voltage selection GPIOs are defined */
 702         if (gpio_is_valid(pdata->buck1_set1) &&
 703             gpio_is_valid(pdata->buck1_set2)) {
 704                 /* Check if SET1 is not equal to 0 */
 705                 if (!pdata->buck1_set1) {
 706                         dev_err(&pdev->dev,
 707                                 "MAX8998 SET1 GPIO defined as 0 !\n");
 708                         WARN_ON(!pdata->buck1_set1);
 709                         return -EIO;
 710                 }
 711                 /* Check if SET2 is not equal to 0 */
 712                 if (!pdata->buck1_set2) {
 713                         dev_err(&pdev->dev,
 714                                 "MAX8998 SET2 GPIO defined as 0 !\n");
 715                         WARN_ON(!pdata->buck1_set2);
 716                         return -EIO;
 717                 }
 718
 719                 gpio_request(pdata->buck1_set1, "MAX8998 BUCK1_SET1");
 720                 gpio_direction_output(pdata->buck1_set1,
 721                                       max8998->buck1_idx & 0x1);
 722
 723
 724                 gpio_request(pdata->buck1_set2, "MAX8998 BUCK1_SET2");
 725                 gpio_direction_output(pdata->buck1_set2,
 726                                       (max8998->buck1_idx >> 1) & 0x1);
 727
 728                 /* Set predefined values for BUCK1 registers */
 729                 for (v = 0; v < ARRAY_SIZE(pdata->buck1_voltage); ++v) {
 730                         int index = MAX8998_BUCK1 - MAX8998_LDO2;
 731
 732                         i = 0;
 733                         while (regulators[index].min_uV +
 734                                regulators[index].uV_step * i
 735                                < pdata->buck1_voltage[v])
 736                                 i++;
 737
 738                         max8998->buck1_vol[v] = i;
 739                         ret = max8998_write_reg(i2c,
 740                                         MAX8998_REG_BUCK1_VOLTAGE1 + v, i);
 741                         if (ret)
 742                                 return ret;
 743                 }
 744         }
 745
 746         if (gpio_is_valid(pdata->buck2_set3)) {
 747                 /* Check if SET3 is not equal to 0 */
 748                 if (!pdata->buck2_set3) {
 749                         dev_err(&pdev->dev,
 750                                 "MAX8998 SET3 GPIO defined as 0 !\n");
 751                         WARN_ON(!pdata->buck2_set3);
 752                         return -EIO;
 753                 }
 754                 gpio_request(pdata->buck2_set3, "MAX8998 BUCK2_SET3");
 755                 gpio_direction_output(pdata->buck2_set3,
 756                                       max8998->buck2_idx & 0x1);
 757
 758                 /* Set predefined values for BUCK2 registers */
 759                 for (v = 0; v < ARRAY_SIZE(pdata->buck2_voltage); ++v) {
 760                         int index = MAX8998_BUCK2 - MAX8998_LDO2;
 761
 762                         i = 0;
 763                         while (regulators[index].min_uV +
 764                                regulators[index].uV_step * i
 765                                < pdata->buck2_voltage[v])
 766                                 i++;
 767
 768                         max8998->buck2_vol[v] = i;
 769                         ret = max8998_write_reg(i2c,
 770                                         MAX8998_REG_BUCK2_VOLTAGE1 + v, i);
 771                         if (ret)
 772                                 return ret;
 773                 }
 774         }
 775
 776         for (i = 0; i < pdata->num_regulators; i++) {
 777                 int index = pdata->regulators[i].id - MAX8998_LDO2;
 778
 779                 config.dev = max8998->dev;
 780                 config.of_node = pdata->regulators[i].reg_node;
 781                 config.init_data = pdata->regulators[i].initdata;
 782                 config.driver_data = max8998;
 783
 784                 rdev = devm_regulator_register(&pdev->dev, &regulators[index],
 785                                                &config);
 786                 if (IS_ERR(rdev)) {
 787                         ret = PTR_ERR(rdev);
 788                         dev_err(max8998->dev, "regulator %s init failed (%d)\n",
 789                                                 regulators[index].name, ret);
 790                         return ret;
 791                 }
 792         }
 793
 794         return 0;
 795 }
 796
 797 static const struct platform_device_id max8998_pmic_id[] = {
 798         { "max8998-pmic", TYPE_MAX8998 },
 799         { "lp3974-pmic", TYPE_LP3974 },
 800         { }
 801 };
 802 MODULE_DEVICE_TABLE(platform, max8998_pmic_id);
 803
 804 static struct platform_driver max8998_pmic_driver = {
 805         .driver = {
 806                 .name = "max8998-pmic",
 807         },
 808         .probe = max8998_pmic_probe,
 809         .id_table = max8998_pmic_id,
 810 };
 811
 812 static int __init max8998_pmic_init(void)
 813 {
 814         return platform_driver_register(&max8998_pmic_driver);
 815 }
 816 subsys_initcall(max8998_pmic_init);
 817
 818 static void __exit max8998_pmic_cleanup(void)
 819 {
 820         platform_driver_unregister(&max8998_pmic_driver);
 821 }
 822 module_exit(max8998_pmic_cleanup);
 823
 824 MODULE_DESCRIPTION("MAXIM 8998 voltage regulator driver");
 825 MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
 826 MODULE_LICENSE("GPL");