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 int max8998_list_voltage(struct regulator_dev *rdev,
 116                                 unsigned int selector)
 117 {
 118         const struct voltage_map_desc *desc;
 119         int ldo = rdev_get_id(rdev);
 120         int val;
 121
 122         if (ldo >= ARRAY_SIZE(ldo_voltage_map))
 123                 return -EINVAL;
 124
 125         desc = ldo_voltage_map[ldo];
 126         if (desc == NULL)
 127                 return -EINVAL;
 128
 129         val = desc->min + desc->step * selector;
 130         if (val > desc->max)
 131                 return -EINVAL;
 132
 133         return val * 1000;
 134 }
 135
 136 static int max8998_get_enable_register(struct regulator_dev *rdev,
 137                                         int *reg, int *shift)
 138 {
 139         int ldo = rdev_get_id(rdev);
 140
 141         switch (ldo) {
 142         case MAX8998_LDO2 ... MAX8998_LDO5:
 143                 *reg = MAX8998_REG_ONOFF1;
 144                 *shift = 3 - (ldo - MAX8998_LDO2);
 145                 break;
 146         case MAX8998_LDO6 ... MAX8998_LDO13:
 147                 *reg = MAX8998_REG_ONOFF2;
 148                 *shift = 7 - (ldo - MAX8998_LDO6);
 149                 break;
 150         case MAX8998_LDO14 ... MAX8998_LDO17:
 151                 *reg = MAX8998_REG_ONOFF3;
 152                 *shift = 7 - (ldo - MAX8998_LDO14);
 153                 break;
 154         case MAX8998_BUCK1 ... MAX8998_BUCK4:
 155                 *reg = MAX8998_REG_ONOFF1;
 156                 *shift = 7 - (ldo - MAX8998_BUCK1);
 157                 break;
 158         case MAX8998_EN32KHZ_AP ... MAX8998_ENVICHG:
 159                 *reg = MAX8998_REG_ONOFF4;
 160                 *shift = 7 - (ldo - MAX8998_EN32KHZ_AP);
 161                 break;
 162         case MAX8998_ESAFEOUT1 ... MAX8998_ESAFEOUT2:
 163                 *reg = MAX8998_REG_CHGR2;
 164                 *shift = 7 - (ldo - MAX8998_ESAFEOUT1);
 165                 break;
 166         default:
 167                 return -EINVAL;
 168         }
 169
 170         return 0;
 171 }
 172
 173 static int max8998_ldo_is_enabled(struct regulator_dev *rdev)
 174 {
 175         struct max8998_data *max8998 = rdev_get_drvdata(rdev);
 176         struct i2c_client *i2c = max8998->iodev->i2c;
 177         int ret, reg, shift = 8;
 178         u8 val;
 179
 180         ret = max8998_get_enable_register(rdev, &reg, &shift);
 181         if (ret)
 182                 return ret;
 183
 184         ret = max8998_read_reg(i2c, reg, &val);
 185         if (ret)
 186                 return ret;
 187
 188         return val & (1 << shift);
 189 }
 190
 191 static int max8998_ldo_enable(struct regulator_dev *rdev)
 192 {
 193         struct max8998_data *max8998 = rdev_get_drvdata(rdev);
 194         struct i2c_client *i2c = max8998->iodev->i2c;
 195         int reg, shift = 8, ret;
 196
 197         ret = max8998_get_enable_register(rdev, &reg, &shift);
 198         if (ret)
 199                 return ret;
 200
 201         return max8998_update_reg(i2c, reg, 1<<shift, 1<<shift);
 202 }
 203
 204 static int max8998_ldo_disable(struct regulator_dev *rdev)
 205 {
 206         struct max8998_data *max8998 = rdev_get_drvdata(rdev);
 207         struct i2c_client *i2c = max8998->iodev->i2c;
 208         int reg, shift = 8, ret;
 209
 210         ret = max8998_get_enable_register(rdev, &reg, &shift);
 211         if (ret)
 212                 return ret;
 213
 214         return max8998_update_reg(i2c, reg, 0, 1<<shift);
 215 }
 216
 217 static int max8998_get_voltage_register(struct regulator_dev *rdev,
 218                                 int *_reg, int *_shift, int *_mask)
 219 {
 220         int ldo = rdev_get_id(rdev);
 221         struct max8998_data *max8998 = rdev_get_drvdata(rdev);
 222         int reg, shift = 0, mask = 0xff;
 223
 224         switch (ldo) {
 225         case MAX8998_LDO2 ... MAX8998_LDO3:
 226                 reg = MAX8998_REG_LDO2_LDO3;
 227                 mask = 0xf;
 228                 if (ldo == MAX8998_LDO2)
 229                         shift = 4;
 230                 else
 231                         shift = 0;
 232                 break;
 233         case MAX8998_LDO4 ... MAX8998_LDO7:
 234                 reg = MAX8998_REG_LDO4 + (ldo - MAX8998_LDO4);
 235                 break;
 236         case MAX8998_LDO8 ... MAX8998_LDO9:
 237                 reg = MAX8998_REG_LDO8_LDO9;
 238                 mask = 0xf;
 239                 if (ldo == MAX8998_LDO8)
 240                         shift = 4;
 241                 else
 242                         shift = 0;
 243                 break;
 244         case MAX8998_LDO10 ... MAX8998_LDO11:
 245                 reg = MAX8998_REG_LDO10_LDO11;
 246                 if (ldo == MAX8998_LDO10) {
 247                         shift = 5;
 248                         mask = 0x7;
 249                 } else {
 250                         shift = 0;
 251                         mask = 0x1f;
 252                 }
 253                 break;
 254         case MAX8998_LDO12 ... MAX8998_LDO17:
 255                 reg = MAX8998_REG_LDO12 + (ldo - MAX8998_LDO12);
 256                 break;
 257         case MAX8998_BUCK1:
 258                 reg = MAX8998_REG_BUCK1_VOLTAGE1 + max8998->buck1_idx;
 259                 break;
 260         case MAX8998_BUCK2:
 261                 reg = MAX8998_REG_BUCK2_VOLTAGE1 + max8998->buck2_idx;
 262                 break;
 263         case MAX8998_BUCK3:
 264                 reg = MAX8998_REG_BUCK3;
 265                 break;
 266         case MAX8998_BUCK4:
 267                 reg = MAX8998_REG_BUCK4;
 268                 break;
 269         default:
 270                 return -EINVAL;
 271         }
 272
 273         *_reg = reg;
 274         *_shift = shift;
 275         *_mask = mask;
 276
 277         return 0;
 278 }
 279
 280 static int max8998_get_voltage(struct regulator_dev *rdev)
 281 {
 282         struct max8998_data *max8998 = rdev_get_drvdata(rdev);
 283         struct i2c_client *i2c = max8998->iodev->i2c;
 284         int reg, shift = 0, mask, ret;
 285         u8 val;
 286
 287         ret = max8998_get_voltage_register(rdev, &reg, &shift, &mask);
 288         if (ret)
 289                 return ret;
 290
 291         ret = max8998_read_reg(i2c, reg, &val);
 292         if (ret)
 293                 return ret;
 294
 295         val >>= shift;
 296         val &= mask;
 297
 298         return max8998_list_voltage(rdev, val);
 299 }
 300
 301 static int max8998_set_voltage_ldo(struct regulator_dev *rdev,
 302                                    int min_uV, int max_uV, unsigned *selector)
 303 {
 304         struct max8998_data *max8998 = rdev_get_drvdata(rdev);
 305         struct i2c_client *i2c = max8998->iodev->i2c;
 306         int min_vol = min_uV / 1000, max_vol = max_uV / 1000;
 307         const struct voltage_map_desc *desc;
 308         int ldo = rdev_get_id(rdev);
 309         int reg, shift = 0, mask, ret;
 310         int i = 0;
 311
 312         if (ldo >= ARRAY_SIZE(ldo_voltage_map))
 313                 return -EINVAL;
 314
 315         desc = ldo_voltage_map[ldo];
 316         if (desc == NULL)
 317                 return -EINVAL;
 318
 319         if (max_vol < desc->min || min_vol > desc->max)
 320                 return -EINVAL;
 321
 322         while (desc->min + desc->step*i < min_vol &&
 323                desc->min + desc->step*i < desc->max)
 324                 i++;
 325
 326         if (desc->min + desc->step*i > max_vol)
 327                 return -EINVAL;
 328
 329         *selector = i;
 330
 331         ret = max8998_get_voltage_register(rdev, &reg, &shift, &mask);
 332         if (ret)
 333                 return ret;
 334
 335         ret = max8998_update_reg(i2c, reg, i<<shift, mask<<shift);
 336
 337         return ret;
 338 }
 339
 340 static inline void buck1_gpio_set(int gpio1, int gpio2, int v)
 341 {
 342         gpio_set_value(gpio1, v & 0x1);
 343         gpio_set_value(gpio2, (v >> 1) & 0x1);
 344 }
 345
 346 static inline void buck2_gpio_set(int gpio, int v)
 347 {
 348         gpio_set_value(gpio, v & 0x1);
 349 }
 350
 351 static int max8998_set_voltage_buck(struct regulator_dev *rdev,
 352                                     int min_uV, int max_uV, unsigned *selector)
 353 {
 354         struct max8998_data *max8998 = rdev_get_drvdata(rdev);
 355         struct max8998_platform_data *pdata =
 356                 dev_get_platdata(max8998->iodev->dev);
 357         struct i2c_client *i2c = max8998->iodev->i2c;
 358         int min_vol = min_uV / 1000, max_vol = max_uV / 1000;
 359         const struct voltage_map_desc *desc;
 360         int buck = rdev_get_id(rdev);
 361         int reg, shift = 0, mask, ret;
 362         int difference = 0, i = 0, j = 0, previous_vol = 0;
 363         u8 val = 0;
 364         static u8 buck1_last_val;
 365
 366         if (buck >= ARRAY_SIZE(ldo_voltage_map))
 367                 return -EINVAL;
 368
 369         desc = ldo_voltage_map[buck];
 370
 371         if (desc == NULL)
 372                 return -EINVAL;
 373
 374         if (max_vol < desc->min || min_vol > desc->max)
 375                 return -EINVAL;
 376
 377         while (desc->min + desc->step*i < min_vol &&
 378                desc->min + desc->step*i < desc->max)
 379                 i++;
 380
 381         if (desc->min + desc->step*i > max_vol)
 382                 return -EINVAL;
 383
 384         *selector = i;
 385
 386         ret = max8998_get_voltage_register(rdev, &reg, &shift, &mask);
 387         if (ret)
 388                 return ret;
 389
 390         previous_vol = max8998_get_voltage(rdev);
 391
 392         /* Check if voltage needs to be changed */
 393         /* if previous_voltage equal new voltage, return */
 394         if (previous_vol == max8998_list_voltage(rdev, i)) {
 395                 dev_dbg(max8998->dev, "No voltage change, old:%d, new:%d\n",
 396                         previous_vol, max8998_list_voltage(rdev, i));
 397                 return ret;
 398         }
 399
 400         switch (buck) {
 401         case MAX8998_BUCK1:
 402                 dev_dbg(max8998->dev,
 403                         "BUCK1, i:%d, buck1_vol1:%d, buck1_vol2:%d\n"
 404                         "buck1_vol3:%d, buck1_vol4:%d\n",
 405                         i, max8998->buck1_vol[0], max8998->buck1_vol[1],
 406                         max8998->buck1_vol[2], max8998->buck1_vol[3]);
 407
 408                 if (gpio_is_valid(pdata->buck1_set1) &&
 409                     gpio_is_valid(pdata->buck1_set2)) {
 410
 411                         /* check if requested voltage */
 412                         /* value is already defined */
 413                         for (j = 0; j < ARRAY_SIZE(max8998->buck1_vol); j++) {
 414                                 if (max8998->buck1_vol[j] == i) {
 415                                         max8998->buck1_idx = j;
 416                                         buck1_gpio_set(pdata->buck1_set1,
 417                                                        pdata->buck1_set2, j);
 418                                         goto buck1_exit;
 419                                 }
 420                         }
 421
 422                         if (pdata->buck_voltage_lock)
 423                                 return -EINVAL;
 424
 425                         /* no predefine regulator found */
 426                         max8998->buck1_idx = (buck1_last_val % 2) + 2;
 427                         dev_dbg(max8998->dev, "max8998->buck1_idx:%d\n",
 428                                 max8998->buck1_idx);
 429                         max8998->buck1_vol[max8998->buck1_idx] = i;
 430                         ret = max8998_get_voltage_register(rdev, &reg,
 431                                                            &shift,
 432                                                            &mask);
 433                         ret = max8998_write_reg(i2c, reg, i);
 434                         buck1_gpio_set(pdata->buck1_set1,
 435                                        pdata->buck1_set2, max8998->buck1_idx);
 436                         buck1_last_val++;
 437 buck1_exit:
 438                         dev_dbg(max8998->dev, "%s: SET1:%d, SET2:%d\n",
 439                                 i2c->name, gpio_get_value(pdata->buck1_set1),
 440                                 gpio_get_value(pdata->buck1_set2));
 441                         break;
 442                 } else {
 443                         ret = max8998_write_reg(i2c, reg, i);
 444                 }
 445                 break;
 446
 447         case MAX8998_BUCK2:
 448                 dev_dbg(max8998->dev,
 449                         "BUCK2, i:%d buck2_vol1:%d, buck2_vol2:%d\n"
 450                         , i, max8998->buck2_vol[0], max8998->buck2_vol[1]);
 451                 if (gpio_is_valid(pdata->buck2_set3)) {
 452
 453                         /* check if requested voltage */
 454                         /* value is already defined */
 455                         for (j = 0; j < ARRAY_SIZE(max8998->buck2_vol); j++) {
 456                                 if (max8998->buck2_vol[j] == i) {
 457                                         max8998->buck2_idx = j;
 458                                         buck2_gpio_set(pdata->buck2_set3, j);
 459                                         goto buck2_exit;
 460                                 }
 461                         }
 462
 463                         if (pdata->buck_voltage_lock)
 464                                 return -EINVAL;
 465
 466                         max8998_get_voltage_register(rdev,
 467                                         &reg, &shift, &mask);
 468                         ret = max8998_write_reg(i2c, reg, i);
 469                         max8998->buck2_vol[max8998->buck2_idx] = i;
 470                         buck2_gpio_set(pdata->buck2_set3, max8998->buck2_idx);
 471 buck2_exit:
 472                         dev_dbg(max8998->dev, "%s: SET3:%d\n", i2c->name,
 473                                 gpio_get_value(pdata->buck2_set3));
 474                 } else {
 475                         ret = max8998_write_reg(i2c, reg, i);
 476                 }
 477                 break;
 478
 479         case MAX8998_BUCK3:
 480         case MAX8998_BUCK4:
 481                 ret = max8998_update_reg(i2c, reg, i<<shift, mask<<shift);
 482                 break;
 483         }
 484
 485         /* Voltage stabilization */
 486         max8998_read_reg(i2c, MAX8998_REG_ONOFF4, &val);
 487
 488         /* lp3974 hasn't got ENRAMP bit - ramp is assumed as true */
 489         /* MAX8998 has ENRAMP bit implemented, so test it*/
 490         if (max8998->iodev->type == TYPE_MAX8998 && !(val & MAX8998_ENRAMP))
 491                 return ret;
 492
 493         difference = desc->min + desc->step*i - previous_vol/1000;
 494         if (difference > 0)
 495                 udelay(difference / ((val & 0x0f) + 1));
 496
 497         return ret;
 498 }
 499
 500 static struct regulator_ops max8998_ldo_ops = {
 501         .list_voltage           = max8998_list_voltage,
 502         .is_enabled             = max8998_ldo_is_enabled,
 503         .enable                 = max8998_ldo_enable,
 504         .disable                = max8998_ldo_disable,
 505         .get_voltage            = max8998_get_voltage,
 506         .set_voltage            = max8998_set_voltage_ldo,
 507         .set_suspend_enable     = max8998_ldo_enable,
 508         .set_suspend_disable    = max8998_ldo_disable,
 509 };
 510
 511 static struct regulator_ops max8998_buck_ops = {
 512         .list_voltage           = max8998_list_voltage,
 513         .is_enabled             = max8998_ldo_is_enabled,
 514         .enable                 = max8998_ldo_enable,
 515         .disable                = max8998_ldo_disable,
 516         .get_voltage            = max8998_get_voltage,
 517         .set_voltage            = max8998_set_voltage_buck,
 518         .set_suspend_enable     = max8998_ldo_enable,
 519         .set_suspend_disable    = max8998_ldo_disable,
 520 };
 521
 522 static struct regulator_ops max8998_others_ops = {
 523         .is_enabled             = max8998_ldo_is_enabled,
 524         .enable                 = max8998_ldo_enable,
 525         .disable                = max8998_ldo_disable,
 526         .set_suspend_enable     = max8998_ldo_enable,
 527         .set_suspend_disable    = max8998_ldo_disable,
 528 };
 529
 530 static struct regulator_desc regulators[] = {
 531         {
 532                 .name           = "LDO2",
 533                 .id             = MAX8998_LDO2,
 534                 .ops            = &max8998_ldo_ops,
 535                 .type           = REGULATOR_VOLTAGE,
 536                 .owner          = THIS_MODULE,
 537         }, {
 538                 .name           = "LDO3",
 539                 .id             = MAX8998_LDO3,
 540                 .ops            = &max8998_ldo_ops,
 541                 .type           = REGULATOR_VOLTAGE,
 542                 .owner          = THIS_MODULE,
 543         }, {
 544                 .name           = "LDO4",
 545                 .id             = MAX8998_LDO4,
 546                 .ops            = &max8998_ldo_ops,
 547                 .type           = REGULATOR_VOLTAGE,
 548                 .owner          = THIS_MODULE,
 549         }, {
 550                 .name           = "LDO5",
 551                 .id             = MAX8998_LDO5,
 552                 .ops            = &max8998_ldo_ops,
 553                 .type           = REGULATOR_VOLTAGE,
 554                 .owner          = THIS_MODULE,
 555         }, {
 556                 .name           = "LDO6",
 557                 .id             = MAX8998_LDO6,
 558                 .ops            = &max8998_ldo_ops,
 559                 .type           = REGULATOR_VOLTAGE,
 560                 .owner          = THIS_MODULE,
 561         }, {
 562                 .name           = "LDO7",
 563                 .id             = MAX8998_LDO7,
 564                 .ops            = &max8998_ldo_ops,
 565                 .type           = REGULATOR_VOLTAGE,
 566                 .owner          = THIS_MODULE,
 567         }, {
 568                 .name           = "LDO8",
 569                 .id             = MAX8998_LDO8,
 570                 .ops            = &max8998_ldo_ops,
 571                 .type           = REGULATOR_VOLTAGE,
 572                 .owner          = THIS_MODULE,
 573         }, {
 574                 .name           = "LDO9",
 575                 .id             = MAX8998_LDO9,
 576                 .ops            = &max8998_ldo_ops,
 577                 .type           = REGULATOR_VOLTAGE,
 578                 .owner          = THIS_MODULE,
 579         }, {
 580                 .name           = "LDO10",
 581                 .id             = MAX8998_LDO10,
 582                 .ops            = &max8998_ldo_ops,
 583                 .type           = REGULATOR_VOLTAGE,
 584                 .owner          = THIS_MODULE,
 585         }, {
 586                 .name           = "LDO11",
 587                 .id             = MAX8998_LDO11,
 588                 .ops            = &max8998_ldo_ops,
 589                 .type           = REGULATOR_VOLTAGE,
 590                 .owner          = THIS_MODULE,
 591         }, {
 592                 .name           = "LDO12",
 593                 .id             = MAX8998_LDO12,
 594                 .ops            = &max8998_ldo_ops,
 595                 .type           = REGULATOR_VOLTAGE,
 596                 .owner          = THIS_MODULE,
 597         }, {
 598                 .name           = "LDO13",
 599                 .id             = MAX8998_LDO13,
 600                 .ops            = &max8998_ldo_ops,
 601                 .type           = REGULATOR_VOLTAGE,
 602                 .owner          = THIS_MODULE,
 603         }, {
 604                 .name           = "LDO14",
 605                 .id             = MAX8998_LDO14,
 606                 .ops            = &max8998_ldo_ops,
 607                 .type           = REGULATOR_VOLTAGE,
 608                 .owner          = THIS_MODULE,
 609         }, {
 610                 .name           = "LDO15",
 611                 .id             = MAX8998_LDO15,
 612                 .ops            = &max8998_ldo_ops,
 613                 .type           = REGULATOR_VOLTAGE,
 614                 .owner          = THIS_MODULE,
 615         }, {
 616                 .name           = "LDO16",
 617                 .id             = MAX8998_LDO16,
 618                 .ops            = &max8998_ldo_ops,
 619                 .type           = REGULATOR_VOLTAGE,
 620                 .owner          = THIS_MODULE,
 621         }, {
 622                 .name           = "LDO17",
 623                 .id             = MAX8998_LDO17,
 624                 .ops            = &max8998_ldo_ops,
 625                 .type           = REGULATOR_VOLTAGE,
 626                 .owner          = THIS_MODULE,
 627         }, {
 628                 .name           = "BUCK1",
 629                 .id             = MAX8998_BUCK1,
 630                 .ops            = &max8998_buck_ops,
 631                 .type           = REGULATOR_VOLTAGE,
 632                 .owner          = THIS_MODULE,
 633         }, {
 634                 .name           = "BUCK2",
 635                 .id             = MAX8998_BUCK2,
 636                 .ops            = &max8998_buck_ops,
 637                 .type           = REGULATOR_VOLTAGE,
 638                 .owner          = THIS_MODULE,
 639         }, {
 640                 .name           = "BUCK3",
 641                 .id             = MAX8998_BUCK3,
 642                 .ops            = &max8998_buck_ops,
 643                 .type           = REGULATOR_VOLTAGE,
 644                 .owner          = THIS_MODULE,
 645         }, {
 646                 .name           = "BUCK4",
 647                 .id             = MAX8998_BUCK4,
 648                 .ops            = &max8998_buck_ops,
 649                 .type           = REGULATOR_VOLTAGE,
 650                 .owner          = THIS_MODULE,
 651         }, {
 652                 .name           = "EN32KHz AP",
 653                 .id             = MAX8998_EN32KHZ_AP,
 654                 .ops            = &max8998_others_ops,
 655                 .type           = REGULATOR_VOLTAGE,
 656                 .owner          = THIS_MODULE,
 657         }, {
 658                 .name           = "EN32KHz CP",
 659                 .id             = MAX8998_EN32KHZ_CP,
 660                 .ops            = &max8998_others_ops,
 661                 .type           = REGULATOR_VOLTAGE,
 662                 .owner          = THIS_MODULE,
 663         }, {
 664                 .name           = "ENVICHG",
 665                 .id             = MAX8998_ENVICHG,
 666                 .ops            = &max8998_others_ops,
 667                 .type           = REGULATOR_VOLTAGE,
 668                 .owner          = THIS_MODULE,
 669         }, {
 670                 .name           = "ESAFEOUT1",
 671                 .id             = MAX8998_ESAFEOUT1,
 672                 .ops            = &max8998_others_ops,
 673                 .type           = REGULATOR_VOLTAGE,
 674                 .owner          = THIS_MODULE,
 675         }, {
 676                 .name           = "ESAFEOUT2",
 677                 .id             = MAX8998_ESAFEOUT2,
 678                 .ops            = &max8998_others_ops,
 679                 .type           = REGULATOR_VOLTAGE,
 680                 .owner          = THIS_MODULE,
 681         }
 682 };
 683
 684 static __devinit int max8998_pmic_probe(struct platform_device *pdev)
 685 {
 686         struct max8998_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 687         struct max8998_platform_data *pdata = dev_get_platdata(iodev->dev);
 688         struct regulator_dev **rdev;
 689         struct max8998_data *max8998;
 690         struct i2c_client *i2c;
 691         int i, ret, size;
 692
 693         if (!pdata) {
 694                 dev_err(pdev->dev.parent, "No platform init data supplied\n");
 695                 return -ENODEV;
 696         }
 697
 698         max8998 = kzalloc(sizeof(struct max8998_data), GFP_KERNEL);
 699         if (!max8998)
 700                 return -ENOMEM;
 701
 702         size = sizeof(struct regulator_dev *) * pdata->num_regulators;
 703         max8998->rdev = kzalloc(size, GFP_KERNEL);
 704         if (!max8998->rdev) {
 705                 kfree(max8998);
 706                 return -ENOMEM;
 707         }
 708
 709         rdev = max8998->rdev;
 710         max8998->dev = &pdev->dev;
 711         max8998->iodev = iodev;
 712         max8998->num_regulators = pdata->num_regulators;
 713         platform_set_drvdata(pdev, max8998);
 714         i2c = max8998->iodev->i2c;
 715
 716         max8998->buck1_idx = pdata->buck1_default_idx;
 717         max8998->buck2_idx = pdata->buck2_default_idx;
 718
 719         /* NOTE: */
 720         /* For unused GPIO NOT marked as -1 (thereof equal to 0)  WARN_ON */
 721         /* will be displayed */
 722
 723         /* Check if MAX8998 voltage selection GPIOs are defined */
 724         if (gpio_is_valid(pdata->buck1_set1) &&
 725             gpio_is_valid(pdata->buck1_set2)) {
 726                 /* Check if SET1 is not equal to 0 */
 727                 if (!pdata->buck1_set1) {
 728                         printk(KERN_ERR "MAX8998 SET1 GPIO defined as 0 !\n");
 729                         WARN_ON(!pdata->buck1_set1);
 730                         ret = -EIO;
 731                         goto err_free_mem;
 732                 }
 733                 /* Check if SET2 is not equal to 0 */
 734                 if (!pdata->buck1_set2) {
 735                         printk(KERN_ERR "MAX8998 SET2 GPIO defined as 0 !\n");
 736                         WARN_ON(!pdata->buck1_set2);
 737                         ret = -EIO;
 738                         goto err_free_mem;
 739                 }
 740
 741                 gpio_request(pdata->buck1_set1, "MAX8998 BUCK1_SET1");
 742                 gpio_direction_output(pdata->buck1_set1,
 743                                       max8998->buck1_idx & 0x1);
 744
 745
 746                 gpio_request(pdata->buck1_set2, "MAX8998 BUCK1_SET2");
 747                 gpio_direction_output(pdata->buck1_set2,
 748                                       (max8998->buck1_idx >> 1) & 0x1);
 749                 /* Set predefined value for BUCK1 register 1 */
 750                 i = 0;
 751                 while (buck12_voltage_map_desc.min +
 752                        buck12_voltage_map_desc.step*i
 753                        < (pdata->buck1_voltage1 / 1000))
 754                         i++;
 755                 max8998->buck1_vol[0] = i;
 756                 ret = max8998_write_reg(i2c, MAX8998_REG_BUCK1_VOLTAGE1, i);
 757                 if (ret)
 758                         goto err_free_mem;
 759
 760                 /* Set predefined value for BUCK1 register 2 */
 761                 i = 0;
 762                 while (buck12_voltage_map_desc.min +
 763                        buck12_voltage_map_desc.step*i
 764                        < (pdata->buck1_voltage2 / 1000))
 765                         i++;
 766
 767                 max8998->buck1_vol[1] = i;
 768                 ret = max8998_write_reg(i2c, MAX8998_REG_BUCK1_VOLTAGE2, i);
 769                 if (ret)
 770                         goto err_free_mem;
 771
 772                 /* Set predefined value for BUCK1 register 3 */
 773                 i = 0;
 774                 while (buck12_voltage_map_desc.min +
 775                        buck12_voltage_map_desc.step*i
 776                        < (pdata->buck1_voltage3 / 1000))
 777                         i++;
 778
 779                 max8998->buck1_vol[2] = i;
 780                 ret = max8998_write_reg(i2c, MAX8998_REG_BUCK1_VOLTAGE3, i);
 781                 if (ret)
 782                         goto err_free_mem;
 783
 784                 /* Set predefined value for BUCK1 register 4 */
 785                 i = 0;
 786                 while (buck12_voltage_map_desc.min +
 787                        buck12_voltage_map_desc.step*i
 788                        < (pdata->buck1_voltage4 / 1000))
 789                         i++;
 790
 791                 max8998->buck1_vol[3] = i;
 792                 ret = max8998_write_reg(i2c, MAX8998_REG_BUCK1_VOLTAGE4, i);
 793                 if (ret)
 794                         goto err_free_mem;
 795
 796         }
 797
 798         if (gpio_is_valid(pdata->buck2_set3)) {
 799                 /* Check if SET3 is not equal to 0 */
 800                 if (!pdata->buck2_set3) {
 801                         printk(KERN_ERR "MAX8998 SET3 GPIO defined as 0 !\n");
 802                         WARN_ON(!pdata->buck2_set3);
 803                         ret = -EIO;
 804                         goto err_free_mem;
 805                 }
 806                 gpio_request(pdata->buck2_set3, "MAX8998 BUCK2_SET3");
 807                 gpio_direction_output(pdata->buck2_set3,
 808                                       max8998->buck2_idx & 0x1);
 809
 810                 /* BUCK2 register 1 */
 811                 i = 0;
 812                 while (buck12_voltage_map_desc.min +
 813                        buck12_voltage_map_desc.step*i
 814                        < (pdata->buck2_voltage1 / 1000))
 815                         i++;
 816                 max8998->buck2_vol[0] = i;
 817                 ret = max8998_write_reg(i2c, MAX8998_REG_BUCK2_VOLTAGE1, i);
 818                 if (ret)
 819                         goto err_free_mem;
 820
 821                 /* BUCK2 register 2 */
 822                 i = 0;
 823                 while (buck12_voltage_map_desc.min +
 824                        buck12_voltage_map_desc.step*i
 825                        < (pdata->buck2_voltage2 / 1000))
 826                         i++;
 827                 max8998->buck2_vol[1] = i;
 828                 ret = max8998_write_reg(i2c, MAX8998_REG_BUCK2_VOLTAGE2, i);
 829                 if (ret)
 830                         goto err_free_mem;
 831         }
 832
 833         for (i = 0; i < pdata->num_regulators; i++) {
 834                 const struct voltage_map_desc *desc;
 835                 int id = pdata->regulators[i].id;
 836                 int index = id - MAX8998_LDO2;
 837
 838                 desc = ldo_voltage_map[id];
 839                 if (desc && regulators[index].ops != &max8998_others_ops) {
 840                         int count = (desc->max - desc->min) / desc->step + 1;
 841                         regulators[index].n_voltages = count;
 842                 }
 843                 rdev[i] = regulator_register(&regulators[index], max8998->dev,
 844                                 pdata->regulators[i].initdata, max8998, NULL);
 845                 if (IS_ERR(rdev[i])) {
 846                         ret = PTR_ERR(rdev[i]);
 847                         dev_err(max8998->dev, "regulator init failed\n");
 848                         rdev[i] = NULL;
 849                         goto err;
 850                 }
 851         }
 852
 853
 854         return 0;
 855 err:
 856         for (i = 0; i < max8998->num_regulators; i++)
 857                 if (rdev[i])
 858                         regulator_unregister(rdev[i]);
 859
 860 err_free_mem:
 861         kfree(max8998->rdev);
 862         kfree(max8998);
 863
 864         return ret;
 865 }
 866
 867 static int __devexit max8998_pmic_remove(struct platform_device *pdev)
 868 {
 869         struct max8998_data *max8998 = platform_get_drvdata(pdev);
 870         struct regulator_dev **rdev = max8998->rdev;
 871         int i;
 872
 873         for (i = 0; i < max8998->num_regulators; i++)
 874                 if (rdev[i])
 875                         regulator_unregister(rdev[i]);
 876
 877         kfree(max8998->rdev);
 878         kfree(max8998);
 879
 880         return 0;
 881 }
 882
 883 static const struct platform_device_id max8998_pmic_id[] = {
 884         { "max8998-pmic", TYPE_MAX8998 },
 885         { "lp3974-pmic", TYPE_LP3974 },
 886         { }
 887 };
 888 MODULE_DEVICE_TABLE(platform, max8998_pmic_id);
 889
 890 static struct platform_driver max8998_pmic_driver = {
 891         .driver = {
 892                 .name = "max8998-pmic",
 893                 .owner = THIS_MODULE,
 894         },
 895         .probe = max8998_pmic_probe,
 896         .remove = __devexit_p(max8998_pmic_remove),
 897         .id_table = max8998_pmic_id,
 898 };
 899
 900 static int __init max8998_pmic_init(void)
 901 {
 902         return platform_driver_register(&max8998_pmic_driver);
 903 }
 904 subsys_initcall(max8998_pmic_init);
 905
 906 static void __exit max8998_pmic_cleanup(void)
 907 {
 908         platform_driver_unregister(&max8998_pmic_driver);
 909 }
 910 module_exit(max8998_pmic_cleanup);
 911
 912 MODULE_DESCRIPTION("MAXIM 8998 voltage regulator driver");
 913 MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
 914 MODULE_LICENSE("GPL");