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, unsigned *selector)
 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         *selector = i;
 335
 336         ret = max8998_get_voltage_register(rdev, &reg, &shift, &mask);
 337         if (ret)
 338                 return ret;
 339
 340         ret = max8998_update_reg(i2c, reg, i<<shift, mask<<shift);
 341
 342         return ret;
 343 }
 344
 345 static inline void buck1_gpio_set(int gpio1, int gpio2, int v)
 346 {
 347         gpio_set_value(gpio1, v & 0x1);
 348         gpio_set_value(gpio2, (v >> 1) & 0x1);
 349 }
 350
 351 static inline void buck2_gpio_set(int gpio, int v)
 352 {
 353         gpio_set_value(gpio, v & 0x1);
 354 }
 355
 356 static int max8998_set_voltage_buck(struct regulator_dev *rdev,
 357                                     int min_uV, int max_uV, unsigned *selector)
 358 {
 359         struct max8998_data *max8998 = rdev_get_drvdata(rdev);
 360         struct max8998_platform_data *pdata =
 361                 dev_get_platdata(max8998->iodev->dev);
 362         struct i2c_client *i2c = max8998->iodev->i2c;
 363         int min_vol = min_uV / 1000, max_vol = max_uV / 1000;
 364         const struct voltage_map_desc *desc;
 365         int buck = max8998_get_ldo(rdev);
 366         int reg, shift = 0, mask, ret;
 367         int difference = 0, i = 0, j = 0, previous_vol = 0;
 368         u8 val = 0;
 369         static u8 buck1_last_val;
 370
 371         if (buck >= ARRAY_SIZE(ldo_voltage_map))
 372                 return -EINVAL;
 373
 374         desc = ldo_voltage_map[buck];
 375
 376         if (desc == NULL)
 377                 return -EINVAL;
 378
 379         if (max_vol < desc->min || min_vol > desc->max)
 380                 return -EINVAL;
 381
 382         while (desc->min + desc->step*i < min_vol &&
 383                desc->min + desc->step*i < desc->max)
 384                 i++;
 385
 386         if (desc->min + desc->step*i > max_vol)
 387                 return -EINVAL;
 388
 389         *selector = i;
 390
 391         ret = max8998_get_voltage_register(rdev, &reg, &shift, &mask);
 392         if (ret)
 393                 return ret;
 394
 395         previous_vol = max8998_get_voltage(rdev);
 396
 397         /* Check if voltage needs to be changed */
 398         /* if previous_voltage equal new voltage, return */
 399         if (previous_vol == max8998_list_voltage(rdev, i)) {
 400                 dev_dbg(max8998->dev, "No voltage change, old:%d, new:%d\n",
 401                         previous_vol, max8998_list_voltage(rdev, i));
 402                 return ret;
 403         }
 404
 405         switch (buck) {
 406         case MAX8998_BUCK1:
 407                 dev_dbg(max8998->dev,
 408                         "BUCK1, i:%d, buck1_vol1:%d, buck1_vol2:%d\n"
 409                         "buck1_vol3:%d, buck1_vol4:%d\n",
 410                         i, max8998->buck1_vol[0], max8998->buck1_vol[1],
 411                         max8998->buck1_vol[2], max8998->buck1_vol[3]);
 412
 413                 if (gpio_is_valid(pdata->buck1_set1) &&
 414                     gpio_is_valid(pdata->buck1_set2)) {
 415
 416                         /* check if requested voltage */
 417                         /* value is already defined */
 418                         for (j = 0; j < ARRAY_SIZE(max8998->buck1_vol); j++) {
 419                                 if (max8998->buck1_vol[j] == i) {
 420                                         max8998->buck1_idx = j;
 421                                         buck1_gpio_set(pdata->buck1_set1,
 422                                                        pdata->buck1_set2, j);
 423                                         goto buck1_exit;
 424                                 }
 425                         }
 426
 427                         if (pdata->buck_voltage_lock)
 428                                 return -EINVAL;
 429
 430                         /* no predefine regulator found */
 431                         max8998->buck1_idx = (buck1_last_val % 2) + 2;
 432                         dev_dbg(max8998->dev, "max8998->buck1_idx:%d\n",
 433                                 max8998->buck1_idx);
 434                         max8998->buck1_vol[max8998->buck1_idx] = i;
 435                         ret = max8998_get_voltage_register(rdev, &reg,
 436                                                            &shift,
 437                                                            &mask);
 438                         ret = max8998_write_reg(i2c, reg, i);
 439                         buck1_gpio_set(pdata->buck1_set1,
 440                                        pdata->buck1_set2, max8998->buck1_idx);
 441                         buck1_last_val++;
 442 buck1_exit:
 443                         dev_dbg(max8998->dev, "%s: SET1:%d, SET2:%d\n",
 444                                 i2c->name, gpio_get_value(pdata->buck1_set1),
 445                                 gpio_get_value(pdata->buck1_set2));
 446                         break;
 447                 } else {
 448                         ret = max8998_write_reg(i2c, reg, i);
 449                 }
 450                 break;
 451
 452         case MAX8998_BUCK2:
 453                 dev_dbg(max8998->dev,
 454                         "BUCK2, i:%d buck2_vol1:%d, buck2_vol2:%d\n"
 455                         , i, max8998->buck2_vol[0], max8998->buck2_vol[1]);
 456                 if (gpio_is_valid(pdata->buck2_set3)) {
 457
 458                         /* check if requested voltage */
 459                         /* value is already defined */
 460                         for (j = 0; j < ARRAY_SIZE(max8998->buck2_vol); j++) {
 461                                 if (max8998->buck2_vol[j] == i) {
 462                                         max8998->buck2_idx = j;
 463                                         buck2_gpio_set(pdata->buck2_set3, j);
 464                                         goto buck2_exit;
 465                                 }
 466                         }
 467
 468                         if (pdata->buck_voltage_lock)
 469                                 return -EINVAL;
 470
 471                         max8998_get_voltage_register(rdev,
 472                                         &reg, &shift, &mask);
 473                         ret = max8998_write_reg(i2c, reg, i);
 474                         max8998->buck2_vol[max8998->buck2_idx] = i;
 475                         buck2_gpio_set(pdata->buck2_set3, max8998->buck2_idx);
 476 buck2_exit:
 477                         dev_dbg(max8998->dev, "%s: SET3:%d\n", i2c->name,
 478                                 gpio_get_value(pdata->buck2_set3));
 479                 } else {
 480                         ret = max8998_write_reg(i2c, reg, i);
 481                 }
 482                 break;
 483
 484         case MAX8998_BUCK3:
 485         case MAX8998_BUCK4:
 486                 ret = max8998_update_reg(i2c, reg, i<<shift, mask<<shift);
 487                 break;
 488         }
 489
 490         /* Voltage stabilization */
 491         max8998_read_reg(i2c, MAX8998_REG_ONOFF4, &val);
 492
 493         /* lp3974 hasn't got ENRAMP bit - ramp is assumed as true */
 494         /* MAX8998 has ENRAMP bit implemented, so test it*/
 495         if (max8998->iodev->type == TYPE_MAX8998 && !(val & MAX8998_ENRAMP))
 496                 return ret;
 497
 498         difference = desc->min + desc->step*i - previous_vol/1000;
 499         if (difference > 0)
 500                 udelay(difference / ((val & 0x0f) + 1));
 501
 502         return ret;
 503 }
 504
 505 static struct regulator_ops max8998_ldo_ops = {
 506         .list_voltage           = max8998_list_voltage,
 507         .is_enabled             = max8998_ldo_is_enabled,
 508         .enable                 = max8998_ldo_enable,
 509         .disable                = max8998_ldo_disable,
 510         .get_voltage            = max8998_get_voltage,
 511         .set_voltage            = max8998_set_voltage_ldo,
 512         .set_suspend_enable     = max8998_ldo_enable,
 513         .set_suspend_disable    = max8998_ldo_disable,
 514 };
 515
 516 static struct regulator_ops max8998_buck_ops = {
 517         .list_voltage           = max8998_list_voltage,
 518         .is_enabled             = max8998_ldo_is_enabled,
 519         .enable                 = max8998_ldo_enable,
 520         .disable                = max8998_ldo_disable,
 521         .get_voltage            = max8998_get_voltage,
 522         .set_voltage            = max8998_set_voltage_buck,
 523         .set_suspend_enable     = max8998_ldo_enable,
 524         .set_suspend_disable    = max8998_ldo_disable,
 525 };
 526
 527 static struct regulator_ops max8998_others_ops = {
 528         .is_enabled             = max8998_ldo_is_enabled,
 529         .enable                 = max8998_ldo_enable,
 530         .disable                = max8998_ldo_disable,
 531         .set_suspend_enable     = max8998_ldo_enable,
 532         .set_suspend_disable    = max8998_ldo_disable,
 533 };
 534
 535 static struct regulator_desc regulators[] = {
 536         {
 537                 .name           = "LDO2",
 538                 .id             = MAX8998_LDO2,
 539                 .ops            = &max8998_ldo_ops,
 540                 .type           = REGULATOR_VOLTAGE,
 541                 .owner          = THIS_MODULE,
 542         }, {
 543                 .name           = "LDO3",
 544                 .id             = MAX8998_LDO3,
 545                 .ops            = &max8998_ldo_ops,
 546                 .type           = REGULATOR_VOLTAGE,
 547                 .owner          = THIS_MODULE,
 548         }, {
 549                 .name           = "LDO4",
 550                 .id             = MAX8998_LDO4,
 551                 .ops            = &max8998_ldo_ops,
 552                 .type           = REGULATOR_VOLTAGE,
 553                 .owner          = THIS_MODULE,
 554         }, {
 555                 .name           = "LDO5",
 556                 .id             = MAX8998_LDO5,
 557                 .ops            = &max8998_ldo_ops,
 558                 .type           = REGULATOR_VOLTAGE,
 559                 .owner          = THIS_MODULE,
 560         }, {
 561                 .name           = "LDO6",
 562                 .id             = MAX8998_LDO6,
 563                 .ops            = &max8998_ldo_ops,
 564                 .type           = REGULATOR_VOLTAGE,
 565                 .owner          = THIS_MODULE,
 566         }, {
 567                 .name           = "LDO7",
 568                 .id             = MAX8998_LDO7,
 569                 .ops            = &max8998_ldo_ops,
 570                 .type           = REGULATOR_VOLTAGE,
 571                 .owner          = THIS_MODULE,
 572         }, {
 573                 .name           = "LDO8",
 574                 .id             = MAX8998_LDO8,
 575                 .ops            = &max8998_ldo_ops,
 576                 .type           = REGULATOR_VOLTAGE,
 577                 .owner          = THIS_MODULE,
 578         }, {
 579                 .name           = "LDO9",
 580                 .id             = MAX8998_LDO9,
 581                 .ops            = &max8998_ldo_ops,
 582                 .type           = REGULATOR_VOLTAGE,
 583                 .owner          = THIS_MODULE,
 584         }, {
 585                 .name           = "LDO10",
 586                 .id             = MAX8998_LDO10,
 587                 .ops            = &max8998_ldo_ops,
 588                 .type           = REGULATOR_VOLTAGE,
 589                 .owner          = THIS_MODULE,
 590         }, {
 591                 .name           = "LDO11",
 592                 .id             = MAX8998_LDO11,
 593                 .ops            = &max8998_ldo_ops,
 594                 .type           = REGULATOR_VOLTAGE,
 595                 .owner          = THIS_MODULE,
 596         }, {
 597                 .name           = "LDO12",
 598                 .id             = MAX8998_LDO12,
 599                 .ops            = &max8998_ldo_ops,
 600                 .type           = REGULATOR_VOLTAGE,
 601                 .owner          = THIS_MODULE,
 602         }, {
 603                 .name           = "LDO13",
 604                 .id             = MAX8998_LDO13,
 605                 .ops            = &max8998_ldo_ops,
 606                 .type           = REGULATOR_VOLTAGE,
 607                 .owner          = THIS_MODULE,
 608         }, {
 609                 .name           = "LDO14",
 610                 .id             = MAX8998_LDO14,
 611                 .ops            = &max8998_ldo_ops,
 612                 .type           = REGULATOR_VOLTAGE,
 613                 .owner          = THIS_MODULE,
 614         }, {
 615                 .name           = "LDO15",
 616                 .id             = MAX8998_LDO15,
 617                 .ops            = &max8998_ldo_ops,
 618                 .type           = REGULATOR_VOLTAGE,
 619                 .owner          = THIS_MODULE,
 620         }, {
 621                 .name           = "LDO16",
 622                 .id             = MAX8998_LDO16,
 623                 .ops            = &max8998_ldo_ops,
 624                 .type           = REGULATOR_VOLTAGE,
 625                 .owner          = THIS_MODULE,
 626         }, {
 627                 .name           = "LDO17",
 628                 .id             = MAX8998_LDO17,
 629                 .ops            = &max8998_ldo_ops,
 630                 .type           = REGULATOR_VOLTAGE,
 631                 .owner          = THIS_MODULE,
 632         }, {
 633                 .name           = "BUCK1",
 634                 .id             = MAX8998_BUCK1,
 635                 .ops            = &max8998_buck_ops,
 636                 .type           = REGULATOR_VOLTAGE,
 637                 .owner          = THIS_MODULE,
 638         }, {
 639                 .name           = "BUCK2",
 640                 .id             = MAX8998_BUCK2,
 641                 .ops            = &max8998_buck_ops,
 642                 .type           = REGULATOR_VOLTAGE,
 643                 .owner          = THIS_MODULE,
 644         }, {
 645                 .name           = "BUCK3",
 646                 .id             = MAX8998_BUCK3,
 647                 .ops            = &max8998_buck_ops,
 648                 .type           = REGULATOR_VOLTAGE,
 649                 .owner          = THIS_MODULE,
 650         }, {
 651                 .name           = "BUCK4",
 652                 .id             = MAX8998_BUCK4,
 653                 .ops            = &max8998_buck_ops,
 654                 .type           = REGULATOR_VOLTAGE,
 655                 .owner          = THIS_MODULE,
 656         }, {
 657                 .name           = "EN32KHz AP",
 658                 .id             = MAX8998_EN32KHZ_AP,
 659                 .ops            = &max8998_others_ops,
 660                 .type           = REGULATOR_VOLTAGE,
 661                 .owner          = THIS_MODULE,
 662         }, {
 663                 .name           = "EN32KHz CP",
 664                 .id             = MAX8998_EN32KHZ_CP,
 665                 .ops            = &max8998_others_ops,
 666                 .type           = REGULATOR_VOLTAGE,
 667                 .owner          = THIS_MODULE,
 668         }, {
 669                 .name           = "ENVICHG",
 670                 .id             = MAX8998_ENVICHG,
 671                 .ops            = &max8998_others_ops,
 672                 .type           = REGULATOR_VOLTAGE,
 673                 .owner          = THIS_MODULE,
 674         }, {
 675                 .name           = "ESAFEOUT1",
 676                 .id             = MAX8998_ESAFEOUT1,
 677                 .ops            = &max8998_others_ops,
 678                 .type           = REGULATOR_VOLTAGE,
 679                 .owner          = THIS_MODULE,
 680         }, {
 681                 .name           = "ESAFEOUT2",
 682                 .id             = MAX8998_ESAFEOUT2,
 683                 .ops            = &max8998_others_ops,
 684                 .type           = REGULATOR_VOLTAGE,
 685                 .owner          = THIS_MODULE,
 686         }
 687 };
 688
 689 static __devinit int max8998_pmic_probe(struct platform_device *pdev)
 690 {
 691         struct max8998_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 692         struct max8998_platform_data *pdata = dev_get_platdata(iodev->dev);
 693         struct regulator_dev **rdev;
 694         struct max8998_data *max8998;
 695         struct i2c_client *i2c;
 696         int i, ret, size;
 697
 698         if (!pdata) {
 699                 dev_err(pdev->dev.parent, "No platform init data supplied\n");
 700                 return -ENODEV;
 701         }
 702
 703         max8998 = kzalloc(sizeof(struct max8998_data), GFP_KERNEL);
 704         if (!max8998)
 705                 return -ENOMEM;
 706
 707         size = sizeof(struct regulator_dev *) * pdata->num_regulators;
 708         max8998->rdev = kzalloc(size, GFP_KERNEL);
 709         if (!max8998->rdev) {
 710                 kfree(max8998);
 711                 return -ENOMEM;
 712         }
 713
 714         rdev = max8998->rdev;
 715         max8998->dev = &pdev->dev;
 716         max8998->iodev = iodev;
 717         max8998->num_regulators = pdata->num_regulators;
 718         platform_set_drvdata(pdev, max8998);
 719         i2c = max8998->iodev->i2c;
 720
 721         max8998->buck1_idx = pdata->buck1_default_idx;
 722         max8998->buck2_idx = pdata->buck2_default_idx;
 723
 724         /* NOTE: */
 725         /* For unused GPIO NOT marked as -1 (thereof equal to 0)  WARN_ON */
 726         /* will be displayed */
 727
 728         /* Check if MAX8998 voltage selection GPIOs are defined */
 729         if (gpio_is_valid(pdata->buck1_set1) &&
 730             gpio_is_valid(pdata->buck1_set2)) {
 731                 /* Check if SET1 is not equal to 0 */
 732                 if (!pdata->buck1_set1) {
 733                         printk(KERN_ERR "MAX8998 SET1 GPIO defined as 0 !\n");
 734                         WARN_ON(!pdata->buck1_set1);
 735                         ret = -EIO;
 736                         goto err_free_mem;
 737                 }
 738                 /* Check if SET2 is not equal to 0 */
 739                 if (!pdata->buck1_set2) {
 740                         printk(KERN_ERR "MAX8998 SET2 GPIO defined as 0 !\n");
 741                         WARN_ON(!pdata->buck1_set2);
 742                         ret = -EIO;
 743                         goto err_free_mem;
 744                 }
 745
 746                 gpio_request(pdata->buck1_set1, "MAX8998 BUCK1_SET1");
 747                 gpio_direction_output(pdata->buck1_set1,
 748                                       max8998->buck1_idx & 0x1);
 749
 750
 751                 gpio_request(pdata->buck1_set2, "MAX8998 BUCK1_SET2");
 752                 gpio_direction_output(pdata->buck1_set2,
 753                                       (max8998->buck1_idx >> 1) & 0x1);
 754                 /* Set predefined value for BUCK1 register 1 */
 755                 i = 0;
 756                 while (buck12_voltage_map_desc.min +
 757                        buck12_voltage_map_desc.step*i
 758                        < (pdata->buck1_voltage1 / 1000))
 759                         i++;
 760                 max8998->buck1_vol[0] = i;
 761                 ret = max8998_write_reg(i2c, MAX8998_REG_BUCK1_VOLTAGE1, i);
 762                 if (ret)
 763                         goto err_free_mem;
 764
 765                 /* Set predefined value for BUCK1 register 2 */
 766                 i = 0;
 767                 while (buck12_voltage_map_desc.min +
 768                        buck12_voltage_map_desc.step*i
 769                        < (pdata->buck1_voltage2 / 1000))
 770                         i++;
 771
 772                 max8998->buck1_vol[1] = i;
 773                 ret = max8998_write_reg(i2c, MAX8998_REG_BUCK1_VOLTAGE2, i);
 774                 if (ret)
 775                         goto err_free_mem;
 776
 777                 /* Set predefined value for BUCK1 register 3 */
 778                 i = 0;
 779                 while (buck12_voltage_map_desc.min +
 780                        buck12_voltage_map_desc.step*i
 781                        < (pdata->buck1_voltage3 / 1000))
 782                         i++;
 783
 784                 max8998->buck1_vol[2] = i;
 785                 ret = max8998_write_reg(i2c, MAX8998_REG_BUCK1_VOLTAGE3, i);
 786                 if (ret)
 787                         goto err_free_mem;
 788
 789                 /* Set predefined value for BUCK1 register 4 */
 790                 i = 0;
 791                 while (buck12_voltage_map_desc.min +
 792                        buck12_voltage_map_desc.step*i
 793                        < (pdata->buck1_voltage4 / 1000))
 794                         i++;
 795
 796                 max8998->buck1_vol[3] = i;
 797                 ret = max8998_write_reg(i2c, MAX8998_REG_BUCK1_VOLTAGE4, i);
 798                 if (ret)
 799                         goto err_free_mem;
 800
 801         }
 802
 803         if (gpio_is_valid(pdata->buck2_set3)) {
 804                 /* Check if SET3 is not equal to 0 */
 805                 if (!pdata->buck2_set3) {
 806                         printk(KERN_ERR "MAX8998 SET3 GPIO defined as 0 !\n");
 807                         WARN_ON(!pdata->buck2_set3);
 808                         ret = -EIO;
 809                         goto err_free_mem;
 810                 }
 811                 gpio_request(pdata->buck2_set3, "MAX8998 BUCK2_SET3");
 812                 gpio_direction_output(pdata->buck2_set3,
 813                                       max8998->buck2_idx & 0x1);
 814
 815                 /* BUCK2 register 1 */
 816                 i = 0;
 817                 while (buck12_voltage_map_desc.min +
 818                        buck12_voltage_map_desc.step*i
 819                        < (pdata->buck2_voltage1 / 1000))
 820                         i++;
 821                 max8998->buck2_vol[0] = i;
 822                 ret = max8998_write_reg(i2c, MAX8998_REG_BUCK2_VOLTAGE1, i);
 823                 if (ret)
 824                         goto err_free_mem;
 825
 826                 /* BUCK2 register 2 */
 827                 i = 0;
 828                 while (buck12_voltage_map_desc.min +
 829                        buck12_voltage_map_desc.step*i
 830                        < (pdata->buck2_voltage2 / 1000))
 831                         i++;
 832                 printk(KERN_ERR "i2:%d, buck2_idx:%d\n", i, max8998->buck2_idx);
 833                 max8998->buck2_vol[1] = i;
 834                 ret = max8998_write_reg(i2c, MAX8998_REG_BUCK2_VOLTAGE2, i);
 835                 if (ret)
 836                         goto err_free_mem;
 837         }
 838
 839         for (i = 0; i < pdata->num_regulators; i++) {
 840                 const struct voltage_map_desc *desc;
 841                 int id = pdata->regulators[i].id;
 842                 int index = id - MAX8998_LDO2;
 843
 844                 desc = ldo_voltage_map[id];
 845                 if (desc && regulators[index].ops != &max8998_others_ops) {
 846                         int count = (desc->max - desc->min) / desc->step + 1;
 847                         regulators[index].n_voltages = count;
 848                 }
 849                 rdev[i] = regulator_register(&regulators[index], max8998->dev,
 850                                 pdata->regulators[i].initdata, max8998);
 851                 if (IS_ERR(rdev[i])) {
 852                         ret = PTR_ERR(rdev[i]);
 853                         dev_err(max8998->dev, "regulator init failed\n");
 854                         rdev[i] = NULL;
 855                         goto err;
 856                 }
 857         }
 858
 859
 860         return 0;
 861 err:
 862         for (i = 0; i < max8998->num_regulators; i++)
 863                 if (rdev[i])
 864                         regulator_unregister(rdev[i]);
 865
 866 err_free_mem:
 867         kfree(max8998->rdev);
 868         kfree(max8998);
 869
 870         return ret;
 871 }
 872
 873 static int __devexit max8998_pmic_remove(struct platform_device *pdev)
 874 {
 875         struct max8998_data *max8998 = platform_get_drvdata(pdev);
 876         struct regulator_dev **rdev = max8998->rdev;
 877         int i;
 878
 879         for (i = 0; i < max8998->num_regulators; i++)
 880                 if (rdev[i])
 881                         regulator_unregister(rdev[i]);
 882
 883         kfree(max8998->rdev);
 884         kfree(max8998);
 885
 886         return 0;
 887 }
 888
 889 static const struct platform_device_id max8998_pmic_id[] = {
 890         { "max8998-pmic", TYPE_MAX8998 },
 891         { "lp3974-pmic", TYPE_LP3974 },
 892         { }
 893 };
 894 MODULE_DEVICE_TABLE(platform, max8998_pmic_id);
 895
 896 static struct platform_driver max8998_pmic_driver = {
 897         .driver = {
 898                 .name = "max8998-pmic",
 899                 .owner = THIS_MODULE,
 900         },
 901         .probe = max8998_pmic_probe,
 902         .remove = __devexit_p(max8998_pmic_remove),
 903         .id_table = max8998_pmic_id,
 904 };
 905
 906 static int __init max8998_pmic_init(void)
 907 {
 908         return platform_driver_register(&max8998_pmic_driver);
 909 }
 910 subsys_initcall(max8998_pmic_init);
 911
 912 static void __exit max8998_pmic_cleanup(void)
 913 {
 914         platform_driver_unregister(&max8998_pmic_driver);
 915 }
 916 module_exit(max8998_pmic_cleanup);
 917
 918 MODULE_DESCRIPTION("MAXIM 8998 voltage regulator driver");
 919 MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
 920 MODULE_LICENSE("GPL");