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/platform_device.h>
  32 #include <linux/regulator/driver.h>
  33 #include <linux/mfd/max8998.h>
  34 #include <linux/mfd/max8998-private.h>
  35
  36 struct max8998_data {
  37         struct device           *dev;
  38         struct max8998_dev      *iodev;
  39         int                     num_regulators;
  40         struct regulator_dev    **rdev;
  41         u8                      buck1_vol[4]; /* voltages for selection */
  42         u8                      buck2_vol[2];
  43         unsigned int            buck1_idx; /* index to last changed voltage */
  44                                            /* value in a set */
  45         unsigned int            buck2_idx;
  46 };
  47
  48 struct voltage_map_desc {
  49         int min;
  50         int max;
  51         int step;
  52 };
  53
  54 /* Voltage maps */
  55 static const struct voltage_map_desc ldo23_voltage_map_desc = {
  56         .min = 800,     .step = 50,     .max = 1300,
  57 };
  58 static const struct voltage_map_desc ldo456711_voltage_map_desc = {
  59         .min = 1600,    .step = 100,    .max = 3600,
  60 };
  61 static const struct voltage_map_desc ldo8_voltage_map_desc = {
  62         .min = 3000,    .step = 100,    .max = 3600,
  63 };
  64 static const struct voltage_map_desc ldo9_voltage_map_desc = {
  65         .min = 2800,    .step = 100,    .max = 3100,
  66 };
  67 static const struct voltage_map_desc ldo10_voltage_map_desc = {
  68         .min = 950,     .step = 50,     .max = 1300,
  69 };
  70 static const struct voltage_map_desc ldo1213_voltage_map_desc = {
  71         .min = 800,     .step = 100,    .max = 3300,
  72 };
  73 static const struct voltage_map_desc ldo1415_voltage_map_desc = {
  74         .min = 1200,    .step = 100,    .max = 3300,
  75 };
  76 static const struct voltage_map_desc ldo1617_voltage_map_desc = {
  77         .min = 1600,    .step = 100,    .max = 3600,
  78 };
  79 static const struct voltage_map_desc buck12_voltage_map_desc = {
  80         .min = 750,     .step = 25,     .max = 1525,
  81 };
  82 static const struct voltage_map_desc buck3_voltage_map_desc = {
  83         .min = 1600,    .step = 100,    .max = 3600,
  84 };
  85 static const struct voltage_map_desc buck4_voltage_map_desc = {
  86         .min = 800,     .step = 100,    .max = 2300,
  87 };
  88
  89 static const struct voltage_map_desc *ldo_voltage_map[] = {
  90         NULL,
  91         NULL,
  92         &ldo23_voltage_map_desc,        /* LDO2 */
  93         &ldo23_voltage_map_desc,        /* LDO3 */
  94         &ldo456711_voltage_map_desc,    /* LDO4 */
  95         &ldo456711_voltage_map_desc,    /* LDO5 */
  96         &ldo456711_voltage_map_desc,    /* LDO6 */
  97         &ldo456711_voltage_map_desc,    /* LDO7 */
  98         &ldo8_voltage_map_desc,         /* LDO8 */
  99         &ldo9_voltage_map_desc,         /* LDO9 */
 100         &ldo10_voltage_map_desc,        /* LDO10 */
 101         &ldo456711_voltage_map_desc,    /* LDO11 */
 102         &ldo1213_voltage_map_desc,      /* LDO12 */
 103         &ldo1213_voltage_map_desc,      /* LDO13 */
 104         &ldo1415_voltage_map_desc,      /* LDO14 */
 105         &ldo1415_voltage_map_desc,      /* LDO15 */
 106         &ldo1617_voltage_map_desc,      /* LDO16 */
 107         &ldo1617_voltage_map_desc,      /* LDO17 */
 108         &buck12_voltage_map_desc,       /* BUCK1 */
 109         &buck12_voltage_map_desc,       /* BUCK2 */
 110         &buck3_voltage_map_desc,        /* BUCK3 */
 111         &buck4_voltage_map_desc,        /* BUCK4 */
 112 };
 113
 114 static int max8998_get_enable_register(struct regulator_dev *rdev,
 115                                         int *reg, int *shift)
 116 {
 117         int ldo = rdev_get_id(rdev);
 118
 119         switch (ldo) {
 120         case MAX8998_LDO2 ... MAX8998_LDO5:
 121                 *reg = MAX8998_REG_ONOFF1;
 122                 *shift = 3 - (ldo - MAX8998_LDO2);
 123                 break;
 124         case MAX8998_LDO6 ... MAX8998_LDO13:
 125                 *reg = MAX8998_REG_ONOFF2;
 126                 *shift = 7 - (ldo - MAX8998_LDO6);
 127                 break;
 128         case MAX8998_LDO14 ... MAX8998_LDO17:
 129                 *reg = MAX8998_REG_ONOFF3;
 130                 *shift = 7 - (ldo - MAX8998_LDO14);
 131                 break;
 132         case MAX8998_BUCK1 ... MAX8998_BUCK4:
 133                 *reg = MAX8998_REG_ONOFF1;
 134                 *shift = 7 - (ldo - MAX8998_BUCK1);
 135                 break;
 136         case MAX8998_EN32KHZ_AP ... MAX8998_ENVICHG:
 137                 *reg = MAX8998_REG_ONOFF4;
 138                 *shift = 7 - (ldo - MAX8998_EN32KHZ_AP);
 139                 break;
 140         case MAX8998_ESAFEOUT1 ... MAX8998_ESAFEOUT2:
 141                 *reg = MAX8998_REG_CHGR2;
 142                 *shift = 7 - (ldo - MAX8998_ESAFEOUT1);
 143                 break;
 144         default:
 145                 return -EINVAL;
 146         }
 147
 148         return 0;
 149 }
 150
 151 static int max8998_ldo_is_enabled(struct regulator_dev *rdev)
 152 {
 153         struct max8998_data *max8998 = rdev_get_drvdata(rdev);
 154         struct i2c_client *i2c = max8998->iodev->i2c;
 155         int ret, reg, shift = 8;
 156         u8 val;
 157
 158         ret = max8998_get_enable_register(rdev, &reg, &shift);
 159         if (ret)
 160                 return ret;
 161
 162         ret = max8998_read_reg(i2c, reg, &val);
 163         if (ret)
 164                 return ret;
 165
 166         return val & (1 << shift);
 167 }
 168
 169 static int max8998_ldo_enable(struct regulator_dev *rdev)
 170 {
 171         struct max8998_data *max8998 = rdev_get_drvdata(rdev);
 172         struct i2c_client *i2c = max8998->iodev->i2c;
 173         int reg, shift = 8, ret;
 174
 175         ret = max8998_get_enable_register(rdev, &reg, &shift);
 176         if (ret)
 177                 return ret;
 178
 179         return max8998_update_reg(i2c, reg, 1<<shift, 1<<shift);
 180 }
 181
 182 static int max8998_ldo_disable(struct regulator_dev *rdev)
 183 {
 184         struct max8998_data *max8998 = rdev_get_drvdata(rdev);
 185         struct i2c_client *i2c = max8998->iodev->i2c;
 186         int reg, shift = 8, ret;
 187
 188         ret = max8998_get_enable_register(rdev, &reg, &shift);
 189         if (ret)
 190                 return ret;
 191
 192         return max8998_update_reg(i2c, reg, 0, 1<<shift);
 193 }
 194
 195 static int max8998_get_voltage_register(struct regulator_dev *rdev,
 196                                 int *_reg, int *_shift, int *_mask)
 197 {
 198         int ldo = rdev_get_id(rdev);
 199         struct max8998_data *max8998 = rdev_get_drvdata(rdev);
 200         int reg, shift = 0, mask = 0xff;
 201
 202         switch (ldo) {
 203         case MAX8998_LDO2 ... MAX8998_LDO3:
 204                 reg = MAX8998_REG_LDO2_LDO3;
 205                 mask = 0xf;
 206                 if (ldo == MAX8998_LDO2)
 207                         shift = 4;
 208                 else
 209                         shift = 0;
 210                 break;
 211         case MAX8998_LDO4 ... MAX8998_LDO7:
 212                 reg = MAX8998_REG_LDO4 + (ldo - MAX8998_LDO4);
 213                 break;
 214         case MAX8998_LDO8 ... MAX8998_LDO9:
 215                 reg = MAX8998_REG_LDO8_LDO9;
 216                 mask = 0xf;
 217                 if (ldo == MAX8998_LDO8)
 218                         shift = 4;
 219                 else
 220                         shift = 0;
 221                 break;
 222         case MAX8998_LDO10 ... MAX8998_LDO11:
 223                 reg = MAX8998_REG_LDO10_LDO11;
 224                 if (ldo == MAX8998_LDO10) {
 225                         shift = 5;
 226                         mask = 0x7;
 227                 } else {
 228                         shift = 0;
 229                         mask = 0x1f;
 230                 }
 231                 break;
 232         case MAX8998_LDO12 ... MAX8998_LDO17:
 233                 reg = MAX8998_REG_LDO12 + (ldo - MAX8998_LDO12);
 234                 break;
 235         case MAX8998_BUCK1:
 236                 reg = MAX8998_REG_BUCK1_VOLTAGE1 + max8998->buck1_idx;
 237                 break;
 238         case MAX8998_BUCK2:
 239                 reg = MAX8998_REG_BUCK2_VOLTAGE1 + max8998->buck2_idx;
 240                 break;
 241         case MAX8998_BUCK3:
 242                 reg = MAX8998_REG_BUCK3;
 243                 break;
 244         case MAX8998_BUCK4:
 245                 reg = MAX8998_REG_BUCK4;
 246                 break;
 247         default:
 248                 return -EINVAL;
 249         }
 250
 251         *_reg = reg;
 252         *_shift = shift;
 253         *_mask = mask;
 254
 255         return 0;
 256 }
 257
 258 static int max8998_get_voltage_sel(struct regulator_dev *rdev)
 259 {
 260         struct max8998_data *max8998 = rdev_get_drvdata(rdev);
 261         struct i2c_client *i2c = max8998->iodev->i2c;
 262         int reg, shift = 0, mask, ret;
 263         u8 val;
 264
 265         ret = max8998_get_voltage_register(rdev, &reg, &shift, &mask);
 266         if (ret)
 267                 return ret;
 268
 269         ret = max8998_read_reg(i2c, reg, &val);
 270         if (ret)
 271                 return ret;
 272
 273         val >>= shift;
 274         val &= mask;
 275
 276         return val;
 277 }
 278
 279 static int max8998_set_voltage_ldo(struct regulator_dev *rdev,
 280                                    int min_uV, int max_uV, unsigned *selector)
 281 {
 282         struct max8998_data *max8998 = rdev_get_drvdata(rdev);
 283         struct i2c_client *i2c = max8998->iodev->i2c;
 284         int min_vol = min_uV / 1000, max_vol = max_uV / 1000;
 285         const struct voltage_map_desc *desc;
 286         int ldo = rdev_get_id(rdev);
 287         int reg, shift = 0, mask, ret, i;
 288
 289         if (ldo >= ARRAY_SIZE(ldo_voltage_map))
 290                 return -EINVAL;
 291
 292         desc = ldo_voltage_map[ldo];
 293         if (desc == NULL)
 294                 return -EINVAL;
 295
 296         if (max_vol < desc->min || min_vol > desc->max)
 297                 return -EINVAL;
 298
 299         if (min_vol < desc->min)
 300                 min_vol = desc->min;
 301
 302         i = DIV_ROUND_UP(min_vol - desc->min, desc->step);
 303
 304         if (desc->min + desc->step*i > max_vol)
 305                 return -EINVAL;
 306
 307         *selector = i;
 308
 309         ret = max8998_get_voltage_register(rdev, &reg, &shift, &mask);
 310         if (ret)
 311                 return ret;
 312
 313         ret = max8998_update_reg(i2c, reg, i<<shift, mask<<shift);
 314
 315         return ret;
 316 }
 317
 318 static inline void buck1_gpio_set(int gpio1, int gpio2, int v)
 319 {
 320         gpio_set_value(gpio1, v & 0x1);
 321         gpio_set_value(gpio2, (v >> 1) & 0x1);
 322 }
 323
 324 static inline void buck2_gpio_set(int gpio, int v)
 325 {
 326         gpio_set_value(gpio, v & 0x1);
 327 }
 328
 329 static int max8998_set_voltage_buck(struct regulator_dev *rdev,
 330                                     int min_uV, int max_uV, unsigned *selector)
 331 {
 332         struct max8998_data *max8998 = rdev_get_drvdata(rdev);
 333         struct max8998_platform_data *pdata =
 334                 dev_get_platdata(max8998->iodev->dev);
 335         struct i2c_client *i2c = max8998->iodev->i2c;
 336         int min_vol = min_uV / 1000, max_vol = max_uV / 1000;
 337         const struct voltage_map_desc *desc;
 338         int buck = rdev_get_id(rdev);
 339         int reg, shift = 0, mask, ret;
 340         int i, j, previous_sel;
 341         static u8 buck1_last_val;
 342
 343         if (buck >= ARRAY_SIZE(ldo_voltage_map))
 344                 return -EINVAL;
 345
 346         desc = ldo_voltage_map[buck];
 347
 348         if (desc == NULL)
 349                 return -EINVAL;
 350
 351         if (max_vol < desc->min || min_vol > desc->max)
 352                 return -EINVAL;
 353
 354         if (min_vol < desc->min)
 355                 min_vol = desc->min;
 356
 357         i = DIV_ROUND_UP(min_vol - desc->min, desc->step);
 358
 359         if (desc->min + desc->step*i > max_vol)
 360                 return -EINVAL;
 361
 362         *selector = i;
 363
 364         ret = max8998_get_voltage_register(rdev, &reg, &shift, &mask);
 365         if (ret)
 366                 return ret;
 367
 368         previous_sel = max8998_get_voltage_sel(rdev);
 369
 370         /* Check if voltage needs to be changed */
 371         /* if previous_voltage equal new voltage, return */
 372         if (previous_sel == i) {
 373                 dev_dbg(max8998->dev, "No voltage change, old:%d, new:%d\n",
 374                         regulator_list_voltage_linear(rdev, previous_sel),
 375                         regulator_list_voltage_linear(rdev, i));
 376                 return ret;
 377         }
 378
 379         switch (buck) {
 380         case MAX8998_BUCK1:
 381                 dev_dbg(max8998->dev,
 382                         "BUCK1, i:%d, buck1_vol1:%d, buck1_vol2:%d\n"
 383                         "buck1_vol3:%d, buck1_vol4:%d\n",
 384                         i, max8998->buck1_vol[0], max8998->buck1_vol[1],
 385                         max8998->buck1_vol[2], max8998->buck1_vol[3]);
 386
 387                 if (gpio_is_valid(pdata->buck1_set1) &&
 388                     gpio_is_valid(pdata->buck1_set2)) {
 389
 390                         /* check if requested voltage */
 391                         /* value is already defined */
 392                         for (j = 0; j < ARRAY_SIZE(max8998->buck1_vol); j++) {
 393                                 if (max8998->buck1_vol[j] == i) {
 394                                         max8998->buck1_idx = j;
 395                                         buck1_gpio_set(pdata->buck1_set1,
 396                                                        pdata->buck1_set2, j);
 397                                         goto buck1_exit;
 398                                 }
 399                         }
 400
 401                         if (pdata->buck_voltage_lock)
 402                                 return -EINVAL;
 403
 404                         /* no predefine regulator found */
 405                         max8998->buck1_idx = (buck1_last_val % 2) + 2;
 406                         dev_dbg(max8998->dev, "max8998->buck1_idx:%d\n",
 407                                 max8998->buck1_idx);
 408                         max8998->buck1_vol[max8998->buck1_idx] = i;
 409                         ret = max8998_get_voltage_register(rdev, &reg,
 410                                                            &shift,
 411                                                            &mask);
 412                         ret = max8998_write_reg(i2c, reg, i);
 413                         buck1_gpio_set(pdata->buck1_set1,
 414                                        pdata->buck1_set2, max8998->buck1_idx);
 415                         buck1_last_val++;
 416 buck1_exit:
 417                         dev_dbg(max8998->dev, "%s: SET1:%d, SET2:%d\n",
 418                                 i2c->name, gpio_get_value(pdata->buck1_set1),
 419                                 gpio_get_value(pdata->buck1_set2));
 420                         break;
 421                 } else {
 422                         ret = max8998_write_reg(i2c, reg, i);
 423                 }
 424                 break;
 425
 426         case MAX8998_BUCK2:
 427                 dev_dbg(max8998->dev,
 428                         "BUCK2, i:%d buck2_vol1:%d, buck2_vol2:%d\n"
 429                         , i, max8998->buck2_vol[0], max8998->buck2_vol[1]);
 430                 if (gpio_is_valid(pdata->buck2_set3)) {
 431
 432                         /* check if requested voltage */
 433                         /* value is already defined */
 434                         for (j = 0; j < ARRAY_SIZE(max8998->buck2_vol); j++) {
 435                                 if (max8998->buck2_vol[j] == i) {
 436                                         max8998->buck2_idx = j;
 437                                         buck2_gpio_set(pdata->buck2_set3, j);
 438                                         goto buck2_exit;
 439                                 }
 440                         }
 441
 442                         if (pdata->buck_voltage_lock)
 443                                 return -EINVAL;
 444
 445                         max8998_get_voltage_register(rdev,
 446                                         &reg, &shift, &mask);
 447                         ret = max8998_write_reg(i2c, reg, i);
 448                         max8998->buck2_vol[max8998->buck2_idx] = i;
 449                         buck2_gpio_set(pdata->buck2_set3, max8998->buck2_idx);
 450 buck2_exit:
 451                         dev_dbg(max8998->dev, "%s: SET3:%d\n", i2c->name,
 452                                 gpio_get_value(pdata->buck2_set3));
 453                 } else {
 454                         ret = max8998_write_reg(i2c, reg, i);
 455                 }
 456                 break;
 457
 458         case MAX8998_BUCK3:
 459         case MAX8998_BUCK4:
 460                 ret = max8998_update_reg(i2c, reg, i<<shift, mask<<shift);
 461                 break;
 462         }
 463
 464         return ret;
 465 }
 466
 467 static int max8998_set_voltage_buck_time_sel(struct regulator_dev *rdev,
 468                                              unsigned int old_selector,
 469                                              unsigned int new_selector)
 470 {
 471         struct max8998_data *max8998 = rdev_get_drvdata(rdev);
 472         struct i2c_client *i2c = max8998->iodev->i2c;
 473         const struct voltage_map_desc *desc;
 474         int buck = rdev_get_id(rdev);
 475         u8 val = 0;
 476         int difference, ret;
 477
 478         if (buck < MAX8998_BUCK1 || buck > MAX8998_BUCK4)
 479                 return -EINVAL;
 480
 481         desc = ldo_voltage_map[buck];
 482
 483         /* Voltage stabilization */
 484         ret = max8998_read_reg(i2c, MAX8998_REG_ONOFF4, &val);
 485         if (ret)
 486                 return ret;
 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 0;
 492
 493         difference = (new_selector - old_selector) * desc->step;
 494         if (difference > 0)
 495                 return difference / ((val & 0x0f) + 1);
 496
 497         return 0;
 498 }
 499
 500 static struct regulator_ops max8998_ldo_ops = {
 501         .list_voltage           = regulator_list_voltage_linear,
 502         .is_enabled             = max8998_ldo_is_enabled,
 503         .enable                 = max8998_ldo_enable,
 504         .disable                = max8998_ldo_disable,
 505         .get_voltage_sel        = max8998_get_voltage_sel,
 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           = regulator_list_voltage_linear,
 513         .is_enabled             = max8998_ldo_is_enabled,
 514         .enable                 = max8998_ldo_enable,
 515         .disable                = max8998_ldo_disable,
 516         .get_voltage_sel        = max8998_get_voltage_sel,
 517         .set_voltage            = max8998_set_voltage_buck,
 518         .set_voltage_time_sel   = max8998_set_voltage_buck_time_sel,
 519         .set_suspend_enable     = max8998_ldo_enable,
 520         .set_suspend_disable    = max8998_ldo_disable,
 521 };
 522
 523 static struct regulator_ops max8998_others_ops = {
 524         .is_enabled             = max8998_ldo_is_enabled,
 525         .enable                 = max8998_ldo_enable,
 526         .disable                = max8998_ldo_disable,
 527         .set_suspend_enable     = max8998_ldo_enable,
 528         .set_suspend_disable    = max8998_ldo_disable,
 529 };
 530
 531 static struct regulator_desc regulators[] = {
 532         {
 533                 .name           = "LDO2",
 534                 .id             = MAX8998_LDO2,
 535                 .ops            = &max8998_ldo_ops,
 536                 .type           = REGULATOR_VOLTAGE,
 537                 .owner          = THIS_MODULE,
 538         }, {
 539                 .name           = "LDO3",
 540                 .id             = MAX8998_LDO3,
 541                 .ops            = &max8998_ldo_ops,
 542                 .type           = REGULATOR_VOLTAGE,
 543                 .owner          = THIS_MODULE,
 544         }, {
 545                 .name           = "LDO4",
 546                 .id             = MAX8998_LDO4,
 547                 .ops            = &max8998_ldo_ops,
 548                 .type           = REGULATOR_VOLTAGE,
 549                 .owner          = THIS_MODULE,
 550         }, {
 551                 .name           = "LDO5",
 552                 .id             = MAX8998_LDO5,
 553                 .ops            = &max8998_ldo_ops,
 554                 .type           = REGULATOR_VOLTAGE,
 555                 .owner          = THIS_MODULE,
 556         }, {
 557                 .name           = "LDO6",
 558                 .id             = MAX8998_LDO6,
 559                 .ops            = &max8998_ldo_ops,
 560                 .type           = REGULATOR_VOLTAGE,
 561                 .owner          = THIS_MODULE,
 562         }, {
 563                 .name           = "LDO7",
 564                 .id             = MAX8998_LDO7,
 565                 .ops            = &max8998_ldo_ops,
 566                 .type           = REGULATOR_VOLTAGE,
 567                 .owner          = THIS_MODULE,
 568         }, {
 569                 .name           = "LDO8",
 570                 .id             = MAX8998_LDO8,
 571                 .ops            = &max8998_ldo_ops,
 572                 .type           = REGULATOR_VOLTAGE,
 573                 .owner          = THIS_MODULE,
 574         }, {
 575                 .name           = "LDO9",
 576                 .id             = MAX8998_LDO9,
 577                 .ops            = &max8998_ldo_ops,
 578                 .type           = REGULATOR_VOLTAGE,
 579                 .owner          = THIS_MODULE,
 580         }, {
 581                 .name           = "LDO10",
 582                 .id             = MAX8998_LDO10,
 583                 .ops            = &max8998_ldo_ops,
 584                 .type           = REGULATOR_VOLTAGE,
 585                 .owner          = THIS_MODULE,
 586         }, {
 587                 .name           = "LDO11",
 588                 .id             = MAX8998_LDO11,
 589                 .ops            = &max8998_ldo_ops,
 590                 .type           = REGULATOR_VOLTAGE,
 591                 .owner          = THIS_MODULE,
 592         }, {
 593                 .name           = "LDO12",
 594                 .id             = MAX8998_LDO12,
 595                 .ops            = &max8998_ldo_ops,
 596                 .type           = REGULATOR_VOLTAGE,
 597                 .owner          = THIS_MODULE,
 598         }, {
 599                 .name           = "LDO13",
 600                 .id             = MAX8998_LDO13,
 601                 .ops            = &max8998_ldo_ops,
 602                 .type           = REGULATOR_VOLTAGE,
 603                 .owner          = THIS_MODULE,
 604         }, {
 605                 .name           = "LDO14",
 606                 .id             = MAX8998_LDO14,
 607                 .ops            = &max8998_ldo_ops,
 608                 .type           = REGULATOR_VOLTAGE,
 609                 .owner          = THIS_MODULE,
 610         }, {
 611                 .name           = "LDO15",
 612                 .id             = MAX8998_LDO15,
 613                 .ops            = &max8998_ldo_ops,
 614                 .type           = REGULATOR_VOLTAGE,
 615                 .owner          = THIS_MODULE,
 616         }, {
 617                 .name           = "LDO16",
 618                 .id             = MAX8998_LDO16,
 619                 .ops            = &max8998_ldo_ops,
 620                 .type           = REGULATOR_VOLTAGE,
 621                 .owner          = THIS_MODULE,
 622         }, {
 623                 .name           = "LDO17",
 624                 .id             = MAX8998_LDO17,
 625                 .ops            = &max8998_ldo_ops,
 626                 .type           = REGULATOR_VOLTAGE,
 627                 .owner          = THIS_MODULE,
 628         }, {
 629                 .name           = "BUCK1",
 630                 .id             = MAX8998_BUCK1,
 631                 .ops            = &max8998_buck_ops,
 632                 .type           = REGULATOR_VOLTAGE,
 633                 .owner          = THIS_MODULE,
 634         }, {
 635                 .name           = "BUCK2",
 636                 .id             = MAX8998_BUCK2,
 637                 .ops            = &max8998_buck_ops,
 638                 .type           = REGULATOR_VOLTAGE,
 639                 .owner          = THIS_MODULE,
 640         }, {
 641                 .name           = "BUCK3",
 642                 .id             = MAX8998_BUCK3,
 643                 .ops            = &max8998_buck_ops,
 644                 .type           = REGULATOR_VOLTAGE,
 645                 .owner          = THIS_MODULE,
 646         }, {
 647                 .name           = "BUCK4",
 648                 .id             = MAX8998_BUCK4,
 649                 .ops            = &max8998_buck_ops,
 650                 .type           = REGULATOR_VOLTAGE,
 651                 .owner          = THIS_MODULE,
 652         }, {
 653                 .name           = "EN32KHz AP",
 654                 .id             = MAX8998_EN32KHZ_AP,
 655                 .ops            = &max8998_others_ops,
 656                 .type           = REGULATOR_VOLTAGE,
 657                 .owner          = THIS_MODULE,
 658         }, {
 659                 .name           = "EN32KHz CP",
 660                 .id             = MAX8998_EN32KHZ_CP,
 661                 .ops            = &max8998_others_ops,
 662                 .type           = REGULATOR_VOLTAGE,
 663                 .owner          = THIS_MODULE,
 664         }, {
 665                 .name           = "ENVICHG",
 666                 .id             = MAX8998_ENVICHG,
 667                 .ops            = &max8998_others_ops,
 668                 .type           = REGULATOR_VOLTAGE,
 669                 .owner          = THIS_MODULE,
 670         }, {
 671                 .name           = "ESAFEOUT1",
 672                 .id             = MAX8998_ESAFEOUT1,
 673                 .ops            = &max8998_others_ops,
 674                 .type           = REGULATOR_VOLTAGE,
 675                 .owner          = THIS_MODULE,
 676         }, {
 677                 .name           = "ESAFEOUT2",
 678                 .id             = MAX8998_ESAFEOUT2,
 679                 .ops            = &max8998_others_ops,
 680                 .type           = REGULATOR_VOLTAGE,
 681                 .owner          = THIS_MODULE,
 682         }
 683 };
 684
 685 static __devinit int max8998_pmic_probe(struct platform_device *pdev)
 686 {
 687         struct max8998_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 688         struct max8998_platform_data *pdata = dev_get_platdata(iodev->dev);
 689         struct regulator_config config = { };
 690         struct regulator_dev **rdev;
 691         struct max8998_data *max8998;
 692         struct i2c_client *i2c;
 693         int i, ret, size;
 694
 695         if (!pdata) {
 696                 dev_err(pdev->dev.parent, "No platform init data supplied\n");
 697                 return -ENODEV;
 698         }
 699
 700         max8998 = devm_kzalloc(&pdev->dev, sizeof(struct max8998_data),
 701                                GFP_KERNEL);
 702         if (!max8998)
 703                 return -ENOMEM;
 704
 705         size = sizeof(struct regulator_dev *) * pdata->num_regulators;
 706         max8998->rdev = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
 707         if (!max8998->rdev)
 708                 return -ENOMEM;
 709
 710         rdev = max8998->rdev;
 711         max8998->dev = &pdev->dev;
 712         max8998->iodev = iodev;
 713         max8998->num_regulators = pdata->num_regulators;
 714         platform_set_drvdata(pdev, max8998);
 715         i2c = max8998->iodev->i2c;
 716
 717         max8998->buck1_idx = pdata->buck1_default_idx;
 718         max8998->buck2_idx = pdata->buck2_default_idx;
 719
 720         /* NOTE: */
 721         /* For unused GPIO NOT marked as -1 (thereof equal to 0)  WARN_ON */
 722         /* will be displayed */
 723
 724         /* Check if MAX8998 voltage selection GPIOs are defined */
 725         if (gpio_is_valid(pdata->buck1_set1) &&
 726             gpio_is_valid(pdata->buck1_set2)) {
 727                 /* Check if SET1 is not equal to 0 */
 728                 if (!pdata->buck1_set1) {
 729                         printk(KERN_ERR "MAX8998 SET1 GPIO defined as 0 !\n");
 730                         WARN_ON(!pdata->buck1_set1);
 731                         ret = -EIO;
 732                         goto err_out;
 733                 }
 734                 /* Check if SET2 is not equal to 0 */
 735                 if (!pdata->buck1_set2) {
 736                         printk(KERN_ERR "MAX8998 SET2 GPIO defined as 0 !\n");
 737                         WARN_ON(!pdata->buck1_set2);
 738                         ret = -EIO;
 739                         goto err_out;
 740                 }
 741
 742                 gpio_request(pdata->buck1_set1, "MAX8998 BUCK1_SET1");
 743                 gpio_direction_output(pdata->buck1_set1,
 744                                       max8998->buck1_idx & 0x1);
 745
 746
 747                 gpio_request(pdata->buck1_set2, "MAX8998 BUCK1_SET2");
 748                 gpio_direction_output(pdata->buck1_set2,
 749                                       (max8998->buck1_idx >> 1) & 0x1);
 750                 /* Set predefined value for BUCK1 register 1 */
 751                 i = 0;
 752                 while (buck12_voltage_map_desc.min +
 753                        buck12_voltage_map_desc.step*i
 754                        < (pdata->buck1_voltage1 / 1000))
 755                         i++;
 756                 max8998->buck1_vol[0] = i;
 757                 ret = max8998_write_reg(i2c, MAX8998_REG_BUCK1_VOLTAGE1, i);
 758                 if (ret)
 759                         goto err_out;
 760
 761                 /* Set predefined value for BUCK1 register 2 */
 762                 i = 0;
 763                 while (buck12_voltage_map_desc.min +
 764                        buck12_voltage_map_desc.step*i
 765                        < (pdata->buck1_voltage2 / 1000))
 766                         i++;
 767
 768                 max8998->buck1_vol[1] = i;
 769                 ret = max8998_write_reg(i2c, MAX8998_REG_BUCK1_VOLTAGE2, i);
 770                 if (ret)
 771                         goto err_out;
 772
 773                 /* Set predefined value for BUCK1 register 3 */
 774                 i = 0;
 775                 while (buck12_voltage_map_desc.min +
 776                        buck12_voltage_map_desc.step*i
 777                        < (pdata->buck1_voltage3 / 1000))
 778                         i++;
 779
 780                 max8998->buck1_vol[2] = i;
 781                 ret = max8998_write_reg(i2c, MAX8998_REG_BUCK1_VOLTAGE3, i);
 782                 if (ret)
 783                         goto err_out;
 784
 785                 /* Set predefined value for BUCK1 register 4 */
 786                 i = 0;
 787                 while (buck12_voltage_map_desc.min +
 788                        buck12_voltage_map_desc.step*i
 789                        < (pdata->buck1_voltage4 / 1000))
 790                         i++;
 791
 792                 max8998->buck1_vol[3] = i;
 793                 ret = max8998_write_reg(i2c, MAX8998_REG_BUCK1_VOLTAGE4, i);
 794                 if (ret)
 795                         goto err_out;
 796
 797         }
 798
 799         if (gpio_is_valid(pdata->buck2_set3)) {
 800                 /* Check if SET3 is not equal to 0 */
 801                 if (!pdata->buck2_set3) {
 802                         printk(KERN_ERR "MAX8998 SET3 GPIO defined as 0 !\n");
 803                         WARN_ON(!pdata->buck2_set3);
 804                         ret = -EIO;
 805                         goto err_out;
 806                 }
 807                 gpio_request(pdata->buck2_set3, "MAX8998 BUCK2_SET3");
 808                 gpio_direction_output(pdata->buck2_set3,
 809                                       max8998->buck2_idx & 0x1);
 810
 811                 /* BUCK2 register 1 */
 812                 i = 0;
 813                 while (buck12_voltage_map_desc.min +
 814                        buck12_voltage_map_desc.step*i
 815                        < (pdata->buck2_voltage1 / 1000))
 816                         i++;
 817                 max8998->buck2_vol[0] = i;
 818                 ret = max8998_write_reg(i2c, MAX8998_REG_BUCK2_VOLTAGE1, i);
 819                 if (ret)
 820                         goto err_out;
 821
 822                 /* BUCK2 register 2 */
 823                 i = 0;
 824                 while (buck12_voltage_map_desc.min +
 825                        buck12_voltage_map_desc.step*i
 826                        < (pdata->buck2_voltage2 / 1000))
 827                         i++;
 828                 max8998->buck2_vol[1] = i;
 829                 ret = max8998_write_reg(i2c, MAX8998_REG_BUCK2_VOLTAGE2, i);
 830                 if (ret)
 831                         goto err_out;
 832         }
 833
 834         for (i = 0; i < pdata->num_regulators; i++) {
 835                 const struct voltage_map_desc *desc;
 836                 int id = pdata->regulators[i].id;
 837                 int index = id - MAX8998_LDO2;
 838
 839                 desc = ldo_voltage_map[id];
 840                 if (desc && regulators[index].ops != &max8998_others_ops) {
 841                         int count = (desc->max - desc->min) / desc->step + 1;
 842
 843                         regulators[index].n_voltages = count;
 844                         regulators[index].min_uV = desc->min * 1000;
 845                         regulators[index].uV_step = desc->step * 1000;
 846                 }
 847
 848                 config.dev = max8998->dev;
 849                 config.init_data = pdata->regulators[i].initdata;
 850                 config.driver_data = max8998;
 851
 852                 rdev[i] = regulator_register(&regulators[index], &config);
 853                 if (IS_ERR(rdev[i])) {
 854                         ret = PTR_ERR(rdev[i]);
 855                         dev_err(max8998->dev, "regulator init failed\n");
 856                         rdev[i] = NULL;
 857                         goto err;
 858                 }
 859         }
 860
 861
 862         return 0;
 863 err:
 864         while (--i >= 0)
 865                 regulator_unregister(rdev[i]);
 866 err_out:
 867         return ret;
 868 }
 869
 870 static int __devexit max8998_pmic_remove(struct platform_device *pdev)
 871 {
 872         struct max8998_data *max8998 = platform_get_drvdata(pdev);
 873         struct regulator_dev **rdev = max8998->rdev;
 874         int i;
 875
 876         for (i = 0; i < max8998->num_regulators; i++)
 877                 regulator_unregister(rdev[i]);
 878         return 0;
 879 }
 880
 881 static const struct platform_device_id max8998_pmic_id[] = {
 882         { "max8998-pmic", TYPE_MAX8998 },
 883         { "lp3974-pmic", TYPE_LP3974 },
 884         { }
 885 };
 886 MODULE_DEVICE_TABLE(platform, max8998_pmic_id);
 887
 888 static struct platform_driver max8998_pmic_driver = {
 889         .driver = {
 890                 .name = "max8998-pmic",
 891                 .owner = THIS_MODULE,
 892         },
 893         .probe = max8998_pmic_probe,
 894         .remove = __devexit_p(max8998_pmic_remove),
 895         .id_table = max8998_pmic_id,
 896 };
 897
 898 static int __init max8998_pmic_init(void)
 899 {
 900         return platform_driver_register(&max8998_pmic_driver);
 901 }
 902 subsys_initcall(max8998_pmic_init);
 903
 904 static void __exit max8998_pmic_cleanup(void)
 905 {
 906         platform_driver_unregister(&max8998_pmic_driver);
 907 }
 908 module_exit(max8998_pmic_cleanup);
 909
 910 MODULE_DESCRIPTION("MAXIM 8998 voltage regulator driver");
 911 MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
 912 MODULE_LICENSE("GPL");