drivers/regulator/max8998.c

   1 /*
   2  * max8998.c - Voltage regulator driver for the Maxim 8998
   3  *
   4  *  Copyright (C) 2009-2010 Samsung Electronics
   5  *  Kyungmin Park <kyungmin.park@samsung.com>
   6  *  Marek Szyprowski <m.szyprowski@samsung.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  */
  22
  23 #include <linux/module.h>
  24 #include <linux/init.h>
  25 #include <linux/i2c.h>
  26 #include <linux/err.h>
  27 #include <linux/gpio.h>
  28 #include <linux/slab.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/mutex.h>
  31 #include <linux/delay.h>
  32 #include <linux/platform_device.h>
  33 #include <linux/regulator/driver.h>
  34 #include <linux/mfd/max8998.h>
  35 #include <linux/mfd/max8998-private.h>
  36
  37 struct max8998_data {
  38         struct device           *dev;
  39         struct max8998_dev      *iodev;
  40         int                     num_regulators;
  41         struct regulator_dev    **rdev;
  42         u8                      buck1_vol[4]; /* voltages for selection */
  43         u8                      buck2_vol[2];
  44         unsigned int            buck1_idx; /* index to last changed voltage */
  45                                            /* value in a set */
  46         unsigned int            buck2_idx;
  47 };
  48
  49 struct voltage_map_desc {
  50         int min;
  51         int max;
  52         int step;
  53 };
  54
  55 /* Voltage maps */
  56 static const struct voltage_map_desc ldo23_voltage_map_desc = {
  57         .min = 800,     .step = 50,     .max = 1300,
  58 };
  59 static const struct voltage_map_desc ldo456711_voltage_map_desc = {
  60         .min = 1600,    .step = 100,    .max = 3600,
  61 };
  62 static const struct voltage_map_desc ldo8_voltage_map_desc = {
  63         .min = 3000,    .step = 100,    .max = 3600,
  64 };
  65 static const struct voltage_map_desc ldo9_voltage_map_desc = {
  66         .min = 2800,    .step = 100,    .max = 3100,
  67 };
  68 static const struct voltage_map_desc ldo10_voltage_map_desc = {
  69         .min = 950,     .step = 50,     .max = 1300,
  70 };
  71 static const struct voltage_map_desc ldo1213_voltage_map_desc = {
  72         .min = 800,     .step = 100,    .max = 3300,
  73 };
  74 static const struct voltage_map_desc ldo1415_voltage_map_desc = {
  75         .min = 1200,    .step = 100,    .max = 3300,
  76 };
  77 static const struct voltage_map_desc ldo1617_voltage_map_desc = {
  78         .min = 1600,    .step = 100,    .max = 3600,
  79 };
  80 static const struct voltage_map_desc buck12_voltage_map_desc = {
  81         .min = 750,     .step = 25,     .max = 1525,
  82 };
  83 static const struct voltage_map_desc buck3_voltage_map_desc = {
  84         .min = 1600,    .step = 100,    .max = 3600,
  85 };
  86 static const struct voltage_map_desc buck4_voltage_map_desc = {
  87         .min = 800,     .step = 100,    .max = 2300,
  88 };
  89
  90 static const struct voltage_map_desc *ldo_voltage_map[] = {
  91         NULL,
  92         NULL,
  93         &ldo23_voltage_map_desc,        /* LDO2 */
  94         &ldo23_voltage_map_desc,        /* LDO3 */
  95         &ldo456711_voltage_map_desc,    /* LDO4 */
  96         &ldo456711_voltage_map_desc,    /* LDO5 */
  97         &ldo456711_voltage_map_desc,    /* LDO6 */
  98         &ldo456711_voltage_map_desc,    /* LDO7 */
  99         &ldo8_voltage_map_desc,         /* LDO8 */
 100         &ldo9_voltage_map_desc,         /* LDO9 */
 101         &ldo10_voltage_map_desc,        /* LDO10 */
 102         &ldo456711_voltage_map_desc,    /* LDO11 */
 103         &ldo1213_voltage_map_desc,      /* LDO12 */
 104         &ldo1213_voltage_map_desc,      /* LDO13 */
 105         &ldo1415_voltage_map_desc,      /* LDO14 */
 106         &ldo1415_voltage_map_desc,      /* LDO15 */
 107         &ldo1617_voltage_map_desc,      /* LDO16 */
 108         &ldo1617_voltage_map_desc,      /* LDO17 */
 109         &buck12_voltage_map_desc,       /* BUCK1 */
 110         &buck12_voltage_map_desc,       /* BUCK2 */
 111         &buck3_voltage_map_desc,        /* BUCK3 */
 112         &buck4_voltage_map_desc,        /* BUCK4 */
 113 };
 114
 115 static inline int max8998_get_ldo(struct regulator_dev *rdev)
 116 {
 117         return rdev_get_id(rdev);
 118 }
 119
 120 static int max8998_list_voltage(struct regulator_dev *rdev,
 121                                 unsigned int selector)
 122 {
 123         const struct voltage_map_desc *desc;
 124         int ldo = max8998_get_ldo(rdev);
 125         int val;
 126
 127         if (ldo >= ARRAY_SIZE(ldo_voltage_map))
 128                 return -EINVAL;
 129
 130         desc = ldo_voltage_map[ldo];
 131         if (desc == NULL)
 132                 return -EINVAL;
 133
 134         val = desc->min + desc->step * selector;
 135         if (val > desc->max)
 136                 return -EINVAL;
 137
 138         return val * 1000;
 139 }
 140
 141 static int max8998_get_enable_register(struct regulator_dev *rdev,
 142                                         int *reg, int *shift)
 143 {
 144         int ldo = max8998_get_ldo(rdev);
 145
 146         switch (ldo) {
 147         case MAX8998_LDO2 ... MAX8998_LDO5:
 148                 *reg = MAX8998_REG_ONOFF1;
 149                 *shift = 3 - (ldo - MAX8998_LDO2);
 150                 break;
 151         case MAX8998_LDO6 ... MAX8998_LDO13:
 152                 *reg = MAX8998_REG_ONOFF2;
 153                 *shift = 7 - (ldo - MAX8998_LDO6);
 154                 break;
 155         case MAX8998_LDO14 ... MAX8998_LDO17:
 156                 *reg = MAX8998_REG_ONOFF3;
 157                 *shift = 7 - (ldo - MAX8998_LDO14);
 158                 break;
 159         case MAX8998_BUCK1 ... MAX8998_BUCK4:
 160                 *reg = MAX8998_REG_ONOFF1;
 161                 *shift = 7 - (ldo - MAX8998_BUCK1);
 162                 break;
 163         case MAX8998_EN32KHZ_AP ... MAX8998_ENVICHG:
 164                 *reg = MAX8998_REG_ONOFF4;
 165                 *shift = 7 - (ldo - MAX8998_EN32KHZ_AP);
 166                 break;
 167         case MAX8998_ESAFEOUT1 ... MAX8998_ESAFEOUT2:
 168                 *reg = MAX8998_REG_CHGR2;
 169                 *shift = 7 - (ldo - MAX8998_ESAFEOUT1);
 170                 break;
 171         default:
 172                 return -EINVAL;
 173         }
 174
 175         return 0;
 176 }
 177
 178 static int max8998_ldo_is_enabled(struct regulator_dev *rdev)
 179 {
 180         struct max8998_data *max8998 = rdev_get_drvdata(rdev);
 181         struct i2c_client *i2c = max8998->iodev->i2c;
 182         int ret, reg, shift = 8;
 183         u8 val;
 184
 185         ret = max8998_get_enable_register(rdev, &reg, &shift);
 186         if (ret)
 187                 return ret;
 188
 189         ret = max8998_read_reg(i2c, reg, &val);
 190         if (ret)
 191                 return ret;
 192
 193         return val & (1 << shift);
 194 }
 195
 196 static int max8998_ldo_enable(struct regulator_dev *rdev)
 197 {
 198         struct max8998_data *max8998 = rdev_get_drvdata(rdev);
 199         struct i2c_client *i2c = max8998->iodev->i2c;
 200         int reg, shift = 8, ret;
 201
 202         ret = max8998_get_enable_register(rdev, &reg, &shift);
 203         if (ret)
 204                 return ret;
 205
 206         return max8998_update_reg(i2c, reg, 1<<shift, 1<<shift);
 207 }
 208
 209 static int max8998_ldo_disable(struct regulator_dev *rdev)
 210 {
 211         struct max8998_data *max8998 = rdev_get_drvdata(rdev);
 212         struct i2c_client *i2c = max8998->iodev->i2c;
 213         int reg, shift = 8, ret;
 214
 215         ret = max8998_get_enable_register(rdev, &reg, &shift);
 216         if (ret)
 217                 return ret;
 218
 219         return max8998_update_reg(i2c, reg, 0, 1<<shift);
 220 }
 221
 222 static int max8998_get_voltage_register(struct regulator_dev *rdev,
 223                                 int *_reg, int *_shift, int *_mask)
 224 {
 225         int ldo = max8998_get_ldo(rdev);
 226         struct max8998_data *max8998 = rdev_get_drvdata(rdev);
 227         int reg, shift = 0, mask = 0xff;
 228
 229         switch (ldo) {
 230         case MAX8998_LDO2 ... MAX8998_LDO3:
 231                 reg = MAX8998_REG_LDO2_LDO3;
 232                 mask = 0xf;
 233                 if (ldo == MAX8998_LDO2)
 234                         shift = 4;
 235                 else
 236                         shift = 0;
 237                 break;
 238         case MAX8998_LDO4 ... MAX8998_LDO7:
 239                 reg = MAX8998_REG_LDO4 + (ldo - MAX8998_LDO4);
 240                 break;
 241         case MAX8998_LDO8 ... MAX8998_LDO9:
 242                 reg = MAX8998_REG_LDO8_LDO9;
 243                 mask = 0xf;
 244                 if (ldo == MAX8998_LDO8)
 245                         shift = 4;
 246                 else
 247                         shift = 0;
 248                 break;
 249         case MAX8998_LDO10 ... MAX8998_LDO11:
 250                 reg = MAX8998_REG_LDO10_LDO11;
 251                 if (ldo == MAX8998_LDO10) {
 252                         shift = 5;
 253                         mask = 0x7;
 254                 } else {
 255                         shift = 0;
 256                         mask = 0x1f;
 257                 }
 258                 break;
 259         case MAX8998_LDO12 ... MAX8998_LDO17:
 260                 reg = MAX8998_REG_LDO12 + (ldo - MAX8998_LDO12);
 261                 break;
 262         case MAX8998_BUCK1:
 263                 reg = MAX8998_REG_BUCK1_VOLTAGE1 + max8998->buck1_idx;
 264                 break;
 265         case MAX8998_BUCK2:
 266                 reg = MAX8998_REG_BUCK2_VOLTAGE1 + max8998->buck2_idx;
 267                 break;
 268         case MAX8998_BUCK3:
 269                 reg = MAX8998_REG_BUCK3;
 270                 break;
 271         case MAX8998_BUCK4:
 272                 reg = MAX8998_REG_BUCK4;
 273                 break;
 274         default:
 275                 return -EINVAL;
 276         }
 277
 278         *_reg = reg;
 279         *_shift = shift;
 280         *_mask = mask;
 281
 282         return 0;
 283 }
 284
 285 static int max8998_get_voltage(struct regulator_dev *rdev)
 286 {
 287         struct max8998_data *max8998 = rdev_get_drvdata(rdev);
 288         struct i2c_client *i2c = max8998->iodev->i2c;
 289         int reg, shift = 0, mask, ret;
 290         u8 val;
 291
 292         ret = max8998_get_voltage_register(rdev, &reg, &shift, &mask);
 293         if (ret)
 294                 return ret;
 295
 296         ret = max8998_read_reg(i2c, reg, &val);
 297         if (ret)
 298                 return ret;
 299
 300         val >>= shift;
 301         val &= mask;
 302
 303         return max8998_list_voltage(rdev, val);
 304 }
 305
 306 static int max8998_set_voltage_ldo(struct regulator_dev *rdev,
 307                                 int min_uV, int max_uV)
 308 {
 309         struct max8998_data *max8998 = rdev_get_drvdata(rdev);
 310         struct i2c_client *i2c = max8998->iodev->i2c;
 311         int min_vol = min_uV / 1000, max_vol = max_uV / 1000;
 312         const struct voltage_map_desc *desc;
 313         int ldo = max8998_get_ldo(rdev);
 314         int reg, shift = 0, mask, ret;
 315         int i = 0;
 316
 317         if (ldo >= ARRAY_SIZE(ldo_voltage_map))
 318                 return -EINVAL;
 319
 320         desc = ldo_voltage_map[ldo];
 321         if (desc == NULL)
 322                 return -EINVAL;
 323
 324         if (max_vol < desc->min || min_vol > desc->max)
 325                 return -EINVAL;
 326
 327         while (desc->min + desc->step*i < min_vol &&
 328                desc->min + desc->step*i < desc->max)
 329                 i++;
 330
 331         if (desc->min + desc->step*i > max_vol)
 332                 return -EINVAL;
 333
 334         ret = max8998_get_voltage_register(rdev, &reg, &shift, &mask);
 335         if (ret)
 336                 return ret;
 337
 338         ret = max8998_update_reg(i2c, reg, i<<shift, mask<<shift);
 339
 340         return ret;
 341 }
 342
 343 static inline void buck1_gpio_set(int gpio1, int gpio2, int v)
 344 {
 345         gpio_set_value(gpio1, v & 0x1);
 346         gpio_set_value(gpio2, (v >> 1) & 0x1);
 347 }
 348
 349 static inline void buck2_gpio_set(int gpio, int v)
 350 {
 351         gpio_set_value(gpio, v & 0x1);
 352 }
 353
 354 static int max8998_set_voltage_buck(struct regulator_dev *rdev,
 355                                     int min_uV, int max_uV)
 356 {
 357         struct max8998_data *max8998 = rdev_get_drvdata(rdev);
 358         struct max8998_platform_data *pdata =
 359                 dev_get_platdata(max8998->iodev->dev);
 360         struct i2c_client *i2c = max8998->iodev->i2c;
 361         int min_vol = min_uV / 1000, max_vol = max_uV / 1000;
 362         const struct voltage_map_desc *desc;
 363         int buck = max8998_get_ldo(rdev);
 364         int reg, shift = 0, mask, ret;
 365         int difference = 0, i = 0, j = 0, previous_vol = 0;
 366         u8 val = 0;
 367         static u8 buck1_last_val;
 368
 369         if (buck >= ARRAY_SIZE(ldo_voltage_map))
 370                 return -EINVAL;
 371
 372         desc = ldo_voltage_map[buck];
 373
 374         if (desc == NULL)
 375                 return -EINVAL;
 376
 377         if (max_vol < desc->min || min_vol > desc->max)
 378                 return -EINVAL;
 379
 380         while (desc->min + desc->step*i < min_vol &&
 381                desc->min + desc->step*i < desc->max)
 382                 i++;
 383
 384         if (desc->min + desc->step*i > max_vol)
 385                 return -EINVAL;
 386
 387         ret = max8998_get_voltage_register(rdev, &reg, &shift, &mask);
 388         if (ret)
 389                 return ret;
 390
 391         previous_vol = max8998_get_voltage(rdev);
 392
 393         /* Check if voltage needs to be changed */
 394         /* if previous_voltage equal new voltage, return */
 395         if (previous_vol == max8998_list_voltage(rdev, i)) {
 396                 dev_dbg(max8998->dev, "No voltage change, old:%d, new:%d\n",
 397                         previous_vol, max8998_list_voltage(rdev, i));
 398                 return ret;
 399         }
 400
 401         switch (buck) {
 402         case MAX8998_BUCK1:
 403                 dev_dbg(max8998->dev,
 404                         "BUCK1, i:%d, buck1_vol1:%d, buck1_vol2:%d\n\
 405                          buck1_vol3:%d, buck1_vol4:%d\n",
 406                         i, max8998->buck1_vol[0], max8998->buck1_vol[1],
 407                         max8998->buck1_vol[2], max8998->buck1_vol[3]);
 408
 409                 if (gpio_is_valid(pdata->buck1_set1) &&
 410                     gpio_is_valid(pdata->buck1_set2)) {
 411
 412                         /* check if requested voltage */
 413                         /* value is already defined */
 414                         for (j = 0; j < ARRAY_SIZE(max8998->buck1_vol); j++) {
 415                                 if (max8998->buck1_vol[j] == i) {
 416                                         max8998->buck1_idx = j;
 417                                         buck1_gpio_set(pdata->buck1_set1,
 418                                                        pdata->buck1_set2, j);
 419                                         goto buck1_exit;
 420                                 }
 421                         }
 422
 423                         /* no predefine regulator found */
 424                         max8998->buck1_idx = (buck1_last_val % 2) + 2;
 425                         dev_dbg(max8998->dev, "max8998->buck1_idx:%d\n",
 426                                 max8998->buck1_idx);
 427                         max8998->buck1_vol[max8998->buck1_idx] = i;
 428                         ret = max8998_get_voltage_register(rdev, &reg,
 429                                                            &shift,
 430                                                            &mask);
 431                         ret = max8998_write_reg(i2c, reg, i);
 432                         buck1_gpio_set(pdata->buck1_set1,
 433                                        pdata->buck1_set2, max8998->buck1_idx);
 434                         buck1_last_val++;
 435 buck1_exit:
 436                         dev_dbg(max8998->dev, "%s: SET1:%d, SET2:%d\n",
 437                                 i2c->name, gpio_get_value(pdata->buck1_set1),
 438                                 gpio_get_value(pdata->buck1_set2));
 439                         break;
 440                 } else {
 441                         ret = max8998_write_reg(i2c, reg, i);
 442                 }
 443                 break;
 444
 445         case MAX8998_BUCK2:
 446                 dev_dbg(max8998->dev,
 447                         "BUCK2, i:%d buck2_vol1:%d, buck2_vol2:%d\n"
 448                         , i, max8998->buck2_vol[0], max8998->buck2_vol[1]);
 449                 if (gpio_is_valid(pdata->buck2_set3)) {
 450                         if (max8998->buck2_vol[0] == i) {
 451                                 max8998->buck1_idx = 0;
 452                                 buck2_gpio_set(pdata->buck2_set3, 0);
 453                         } else {
 454                                 max8998->buck1_idx = 1;
 455                                 ret = max8998_get_voltage_register(rdev, &reg,
 456                                                                    &shift,
 457                                                                    &mask);
 458                                 ret = max8998_write_reg(i2c, reg, i);
 459                                 max8998->buck2_vol[1] = i;
 460                                 buck2_gpio_set(pdata->buck2_set3, 1);
 461                         }
 462                         dev_dbg(max8998->dev, "%s: SET3:%d\n", i2c->name,
 463                                 gpio_get_value(pdata->buck2_set3));
 464                 } else {
 465                         ret = max8998_write_reg(i2c, reg, i);
 466                 }
 467                 break;
 468
 469         case MAX8998_BUCK3:
 470         case MAX8998_BUCK4:
 471                 ret = max8998_update_reg(i2c, reg, i<<shift, mask<<shift);
 472                 break;
 473         }
 474
 475         /* Voltage stabilization */
 476         max8998_read_reg(i2c, MAX8998_REG_ONOFF4, &val);
 477
 478         /* lp3974 hasn't got ENRAMP bit - ramp is assumed as true */
 479         /* MAX8998 has ENRAMP bit implemented, so test it*/
 480         if (max8998->iodev->type == TYPE_MAX8998 && !(val & MAX8998_ENRAMP))
 481                 return ret;
 482
 483         difference = desc->min + desc->step*i - previous_vol/1000;
 484         if (difference > 0)
 485                 udelay(difference / ((val & 0x0f) + 1));
 486
 487         return ret;
 488 }
 489
 490 static struct regulator_ops max8998_ldo_ops = {
 491         .list_voltage           = max8998_list_voltage,
 492         .is_enabled             = max8998_ldo_is_enabled,
 493         .enable                 = max8998_ldo_enable,
 494         .disable                = max8998_ldo_disable,
 495         .get_voltage            = max8998_get_voltage,
 496         .set_voltage            = max8998_set_voltage_ldo,
 497         .set_suspend_enable     = max8998_ldo_enable,
 498         .set_suspend_disable    = max8998_ldo_disable,
 499 };
 500
 501 static struct regulator_ops max8998_buck_ops = {
 502         .list_voltage           = max8998_list_voltage,
 503         .is_enabled             = max8998_ldo_is_enabled,
 504         .enable                 = max8998_ldo_enable,
 505         .disable                = max8998_ldo_disable,
 506         .get_voltage            = max8998_get_voltage,
 507         .set_voltage            = max8998_set_voltage_buck,
 508         .set_suspend_enable     = max8998_ldo_enable,
 509         .set_suspend_disable    = max8998_ldo_disable,
 510 };
 511
 512 static struct regulator_ops max8998_others_ops = {
 513         .is_enabled             = max8998_ldo_is_enabled,
 514         .enable                 = max8998_ldo_enable,
 515         .disable                = max8998_ldo_disable,
 516         .set_suspend_enable     = max8998_ldo_enable,
 517         .set_suspend_disable    = max8998_ldo_disable,
 518 };
 519
 520 static struct regulator_desc regulators[] = {
 521         {
 522                 .name           = "LDO2",
 523                 .id             = MAX8998_LDO2,
 524                 .ops            = &max8998_ldo_ops,
 525                 .type           = REGULATOR_VOLTAGE,
 526                 .owner          = THIS_MODULE,
 527         }, {
 528                 .name           = "LDO3",
 529                 .id             = MAX8998_LDO3,
 530                 .ops            = &max8998_ldo_ops,
 531                 .type           = REGULATOR_VOLTAGE,
 532                 .owner          = THIS_MODULE,
 533         }, {
 534                 .name           = "LDO4",
 535                 .id             = MAX8998_LDO4,
 536                 .ops            = &max8998_ldo_ops,
 537                 .type           = REGULATOR_VOLTAGE,
 538                 .owner          = THIS_MODULE,
 539         }, {
 540                 .name           = "LDO5",
 541                 .id             = MAX8998_LDO5,
 542                 .ops            = &max8998_ldo_ops,
 543                 .type           = REGULATOR_VOLTAGE,
 544                 .owner          = THIS_MODULE,
 545         }, {
 546                 .name           = "LDO6",
 547                 .id             = MAX8998_LDO6,
 548                 .ops            = &max8998_ldo_ops,
 549                 .type           = REGULATOR_VOLTAGE,
 550                 .owner          = THIS_MODULE,
 551         }, {
 552                 .name           = "LDO7",
 553                 .id             = MAX8998_LDO7,
 554                 .ops            = &max8998_ldo_ops,
 555                 .type           = REGULATOR_VOLTAGE,
 556                 .owner          = THIS_MODULE,
 557         }, {
 558                 .name           = "LDO8",
 559                 .id             = MAX8998_LDO8,
 560                 .ops            = &max8998_ldo_ops,
 561                 .type           = REGULATOR_VOLTAGE,
 562                 .owner          = THIS_MODULE,
 563         }, {
 564                 .name           = "LDO9",
 565                 .id             = MAX8998_LDO9,
 566                 .ops            = &max8998_ldo_ops,
 567                 .type           = REGULATOR_VOLTAGE,
 568                 .owner          = THIS_MODULE,
 569         }, {
 570                 .name           = "LDO10",
 571                 .id             = MAX8998_LDO10,
 572                 .ops            = &max8998_ldo_ops,
 573                 .type           = REGULATOR_VOLTAGE,
 574                 .owner          = THIS_MODULE,
 575         }, {
 576                 .name           = "LDO11",
 577                 .id             = MAX8998_LDO11,
 578                 .ops            = &max8998_ldo_ops,
 579                 .type           = REGULATOR_VOLTAGE,
 580                 .owner          = THIS_MODULE,
 581         }, {
 582                 .name           = "LDO12",
 583                 .id             = MAX8998_LDO12,
 584                 .ops            = &max8998_ldo_ops,
 585                 .type           = REGULATOR_VOLTAGE,
 586                 .owner          = THIS_MODULE,
 587         }, {
 588                 .name           = "LDO13",
 589                 .id             = MAX8998_LDO13,
 590                 .ops            = &max8998_ldo_ops,
 591                 .type           = REGULATOR_VOLTAGE,
 592                 .owner          = THIS_MODULE,
 593         }, {
 594                 .name           = "LDO14",
 595                 .id             = MAX8998_LDO14,
 596                 .ops            = &max8998_ldo_ops,
 597                 .type           = REGULATOR_VOLTAGE,
 598                 .owner          = THIS_MODULE,
 599         }, {
 600                 .name           = "LDO15",
 601                 .id             = MAX8998_LDO15,
 602                 .ops            = &max8998_ldo_ops,
 603                 .type           = REGULATOR_VOLTAGE,
 604                 .owner          = THIS_MODULE,
 605         }, {
 606                 .name           = "LDO16",
 607                 .id             = MAX8998_LDO16,
 608                 .ops            = &max8998_ldo_ops,
 609                 .type           = REGULATOR_VOLTAGE,
 610                 .owner          = THIS_MODULE,
 611         }, {
 612                 .name           = "LDO17",
 613                 .id             = MAX8998_LDO17,
 614                 .ops            = &max8998_ldo_ops,
 615                 .type           = REGULATOR_VOLTAGE,
 616                 .owner          = THIS_MODULE,
 617         }, {
 618                 .name           = "BUCK1",
 619                 .id             = MAX8998_BUCK1,
 620                 .ops            = &max8998_buck_ops,
 621                 .type           = REGULATOR_VOLTAGE,
 622                 .owner          = THIS_MODULE,
 623         }, {
 624                 .name           = "BUCK2",
 625                 .id             = MAX8998_BUCK2,
 626                 .ops            = &max8998_buck_ops,
 627                 .type           = REGULATOR_VOLTAGE,
 628                 .owner          = THIS_MODULE,
 629         }, {
 630                 .name           = "BUCK3",
 631                 .id             = MAX8998_BUCK3,
 632                 .ops            = &max8998_buck_ops,
 633                 .type           = REGULATOR_VOLTAGE,
 634                 .owner          = THIS_MODULE,
 635         }, {
 636                 .name           = "BUCK4",
 637                 .id             = MAX8998_BUCK4,
 638                 .ops            = &max8998_buck_ops,
 639                 .type           = REGULATOR_VOLTAGE,
 640                 .owner          = THIS_MODULE,
 641         }, {
 642                 .name           = "EN32KHz AP",
 643                 .id             = MAX8998_EN32KHZ_AP,
 644                 .ops            = &max8998_others_ops,
 645                 .type           = REGULATOR_VOLTAGE,
 646                 .owner          = THIS_MODULE,
 647         }, {
 648                 .name           = "EN32KHz CP",
 649                 .id             = MAX8998_EN32KHZ_CP,
 650                 .ops            = &max8998_others_ops,
 651                 .type           = REGULATOR_VOLTAGE,
 652                 .owner          = THIS_MODULE,
 653         }, {
 654                 .name           = "ENVICHG",
 655                 .id             = MAX8998_ENVICHG,
 656                 .ops            = &max8998_others_ops,
 657                 .type           = REGULATOR_VOLTAGE,
 658                 .owner          = THIS_MODULE,
 659         }, {
 660                 .name           = "ESAFEOUT1",
 661                 .id             = MAX8998_ESAFEOUT1,
 662                 .ops            = &max8998_others_ops,
 663                 .type           = REGULATOR_VOLTAGE,
 664                 .owner          = THIS_MODULE,
 665         }, {
 666                 .name           = "ESAFEOUT2",
 667                 .id             = MAX8998_ESAFEOUT2,
 668                 .ops            = &max8998_others_ops,
 669                 .type           = REGULATOR_VOLTAGE,
 670                 .owner          = THIS_MODULE,
 671         }
 672 };
 673
 674 static __devinit int max8998_pmic_probe(struct platform_device *pdev)
 675 {
 676         struct max8998_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 677         struct max8998_platform_data *pdata = dev_get_platdata(iodev->dev);
 678         struct regulator_dev **rdev;
 679         struct max8998_data *max8998;
 680         struct i2c_client *i2c;
 681         int i, ret, size;
 682
 683         if (!pdata) {
 684                 dev_err(pdev->dev.parent, "No platform init data supplied\n");
 685                 return -ENODEV;
 686         }
 687
 688         max8998 = kzalloc(sizeof(struct max8998_data), GFP_KERNEL);
 689         if (!max8998)
 690                 return -ENOMEM;
 691
 692         size = sizeof(struct regulator_dev *) * pdata->num_regulators;
 693         max8998->rdev = kzalloc(size, GFP_KERNEL);
 694         if (!max8998->rdev) {
 695                 kfree(max8998);
 696                 return -ENOMEM;
 697         }
 698
 699         rdev = max8998->rdev;
 700         max8998->dev = &pdev->dev;
 701         max8998->iodev = iodev;
 702         max8998->num_regulators = pdata->num_regulators;
 703         platform_set_drvdata(pdev, max8998);
 704         i2c = max8998->iodev->i2c;
 705
 706         /* NOTE: */
 707         /* For unused GPIO NOT marked as -1 (thereof equal to 0)  WARN_ON */
 708         /* will be displayed */
 709
 710         /* Check if MAX8998 voltage selection GPIOs are defined */
 711         if (gpio_is_valid(pdata->buck1_set1) &&
 712             gpio_is_valid(pdata->buck1_set2)) {
 713                 /* Check if SET1 is not equal to 0 */
 714                 if (!pdata->buck1_set1) {
 715                         printk(KERN_ERR "MAX8998 SET1 GPIO defined as 0 !\n");
 716                         WARN_ON(!pdata->buck1_set1);
 717                         return -EIO;
 718                 }
 719                 /* Check if SET2 is not equal to 0 */
 720                 if (!pdata->buck1_set2) {
 721                         printk(KERN_ERR "MAX8998 SET2 GPIO defined as 0 !\n");
 722                         WARN_ON(!pdata->buck1_set2);
 723                         return -EIO;
 724                 }
 725
 726                 gpio_request(pdata->buck1_set1, "MAX8998 BUCK1_SET1");
 727                 gpio_direction_output(pdata->buck1_set1,
 728                                       max8998->buck1_idx & 0x1);
 729
 730
 731                 gpio_request(pdata->buck1_set2, "MAX8998 BUCK1_SET2");
 732                 gpio_direction_output(pdata->buck1_set2,
 733                                       (max8998->buck1_idx >> 1) & 0x1);
 734                 /* Set predefined value for BUCK1 register 1 */
 735                 i = 0;
 736                 while (buck12_voltage_map_desc.min +
 737                        buck12_voltage_map_desc.step*i
 738                        != (pdata->buck1_max_voltage1 / 1000))
 739                         i++;
 740                 printk(KERN_ERR "i:%d, buck1_idx:%d\n", i, max8998->buck1_idx);
 741                 max8998->buck1_vol[0] = i;
 742                 ret = max8998_write_reg(i2c, MAX8998_REG_BUCK1_VOLTAGE1, i);
 743
 744                 /* Set predefined value for BUCK1 register 2 */
 745                 i = 0;
 746                 while (buck12_voltage_map_desc.min +
 747                        buck12_voltage_map_desc.step*i
 748                        != (pdata->buck1_max_voltage2 / 1000))
 749                         i++;
 750
 751                 max8998->buck1_vol[1] = i;
 752                 printk(KERN_ERR "i:%d, buck1_idx:%d\n", i, max8998->buck1_idx);
 753                 ret = max8998_write_reg(i2c, MAX8998_REG_BUCK1_VOLTAGE2, i)
 754                         + ret;
 755                 if (ret)
 756                         return ret;
 757
 758         }
 759
 760         if (gpio_is_valid(pdata->buck2_set3)) {
 761                 /* Check if SET3 is not equal to 0 */
 762                 if (!pdata->buck2_set3) {
 763                         printk(KERN_ERR "MAX8998 SET3 GPIO defined as 0 !\n");
 764                         WARN_ON(!pdata->buck2_set3);
 765                         return -EIO;
 766                 }
 767                 gpio_request(pdata->buck2_set3, "MAX8998 BUCK2_SET3");
 768                 gpio_direction_output(pdata->buck2_set3,
 769                                       max8998->buck2_idx & 0x1);
 770
 771                 /* BUCK2 - set preset default voltage value to buck2_vol[0] */
 772                 i = 0;
 773                 while (buck12_voltage_map_desc.min +
 774                        buck12_voltage_map_desc.step*i
 775                        != (pdata->buck2_max_voltage / 1000))
 776                         i++;
 777                 printk(KERN_ERR "i:%d, buck2_idx:%d\n", i, max8998->buck2_idx);
 778                 max8998->buck2_vol[0] = i;
 779                 ret = max8998_write_reg(i2c, MAX8998_REG_BUCK2_VOLTAGE1, i);
 780                 if (ret)
 781                         return ret;
 782
 783         }
 784
 785         for (i = 0; i < pdata->num_regulators; i++) {
 786                 const struct voltage_map_desc *desc;
 787                 int id = pdata->regulators[i].id;
 788                 int index = id - MAX8998_LDO2;
 789
 790                 desc = ldo_voltage_map[id];
 791                 if (desc && regulators[index].ops != &max8998_others_ops) {
 792                         int count = (desc->max - desc->min) / desc->step + 1;
 793                         regulators[index].n_voltages = count;
 794                 }
 795                 rdev[i] = regulator_register(&regulators[index], max8998->dev,
 796                                 pdata->regulators[i].initdata, max8998);
 797                 if (IS_ERR(rdev[i])) {
 798                         ret = PTR_ERR(rdev[i]);
 799                         dev_err(max8998->dev, "regulator init failed\n");
 800                         rdev[i] = NULL;
 801                         goto err;
 802                 }
 803         }
 804
 805
 806         return 0;
 807 err:
 808         for (i = 0; i < max8998->num_regulators; i++)
 809                 if (rdev[i])
 810                         regulator_unregister(rdev[i]);
 811
 812         kfree(max8998->rdev);
 813         kfree(max8998);
 814
 815         return ret;
 816 }
 817
 818 static int __devexit max8998_pmic_remove(struct platform_device *pdev)
 819 {
 820         struct max8998_data *max8998 = platform_get_drvdata(pdev);
 821         struct regulator_dev **rdev = max8998->rdev;
 822         int i;
 823
 824         for (i = 0; i < max8998->num_regulators; i++)
 825                 if (rdev[i])
 826                         regulator_unregister(rdev[i]);
 827
 828         kfree(max8998->rdev);
 829         kfree(max8998);
 830
 831         return 0;
 832 }
 833
 834 static struct platform_driver max8998_pmic_driver = {
 835         .driver = {
 836                 .name = "max8998-pmic",
 837                 .owner = THIS_MODULE,
 838         },
 839         .probe = max8998_pmic_probe,
 840         .remove = __devexit_p(max8998_pmic_remove),
 841 };
 842
 843 static int __init max8998_pmic_init(void)
 844 {
 845         return platform_driver_register(&max8998_pmic_driver);
 846 }
 847 subsys_initcall(max8998_pmic_init);
 848
 849 static void __exit max8998_pmic_cleanup(void)
 850 {
 851         platform_driver_unregister(&max8998_pmic_driver);
 852 }
 853 module_exit(max8998_pmic_cleanup);
 854
 855 MODULE_DESCRIPTION("MAXIM 8998 voltage regulator driver");
 856 MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
 857 MODULE_LICENSE("GPL");