drivers/regulator/ab3100.c

   1 /*
   2  * drivers/regulator/ab3100.c
   3  *
   4  * Copyright (C) 2008-2009 ST-Ericsson AB
   5  * License terms: GNU General Public License (GPL) version 2
   6  * Low-level control of the AB3100 IC Low Dropout (LDO)
   7  * regulators, external regulator and buck converter
   8  * Author: Mattias Wallin <mattias.wallin@stericsson.com>
   9  * Author: Linus Walleij <linus.walleij@stericsson.com>
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/kernel.h>
  14 #include <linux/init.h>
  15 #include <linux/err.h>
  16 #include <linux/delay.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/regulator/driver.h>
  19 #include <linux/mfd/abx500.h>
  20
  21 /* LDO registers and some handy masking definitions for AB3100 */
  22 #define AB3100_LDO_A            0x40
  23 #define AB3100_LDO_C            0x41
  24 #define AB3100_LDO_D            0x42
  25 #define AB3100_LDO_E            0x43
  26 #define AB3100_LDO_E_SLEEP      0x44
  27 #define AB3100_LDO_F            0x45
  28 #define AB3100_LDO_G            0x46
  29 #define AB3100_LDO_H            0x47
  30 #define AB3100_LDO_H_SLEEP_MODE 0
  31 #define AB3100_LDO_H_SLEEP_EN   2
  32 #define AB3100_LDO_ON           4
  33 #define AB3100_LDO_H_VSEL_AC    5
  34 #define AB3100_LDO_K            0x48
  35 #define AB3100_LDO_EXT          0x49
  36 #define AB3100_BUCK             0x4A
  37 #define AB3100_BUCK_SLEEP       0x4B
  38 #define AB3100_REG_ON_MASK      0x10
  39
  40 /**
  41  * struct ab3100_regulator
  42  * A struct passed around the individual regulator functions
  43  * @platform_device: platform device holding this regulator
  44  * @dev: handle to the device
  45  * @plfdata: AB3100 platform data passed in at probe time
  46  * @regreg: regulator register number in the AB3100
  47  * @fixed_voltage: a fixed voltage for this regulator, if this
  48  *          0 the voltages array is used instead.
  49  * @typ_voltages: an array of available typical voltages for
  50  *          this regulator
  51  * @voltages_len: length of the array of available voltages
  52  */
  53 struct ab3100_regulator {
  54         struct regulator_dev *rdev;
  55         struct device *dev;
  56         struct ab3100_platform_data *plfdata;
  57         u8 regreg;
  58         int fixed_voltage;
  59         int const *typ_voltages;
  60         u8 voltages_len;
  61 };
  62
  63 /* The order in which registers are initialized */
  64 static const u8 ab3100_reg_init_order[AB3100_NUM_REGULATORS+2] = {
  65         AB3100_LDO_A,
  66         AB3100_LDO_C,
  67         AB3100_LDO_E,
  68         AB3100_LDO_E_SLEEP,
  69         AB3100_LDO_F,
  70         AB3100_LDO_G,
  71         AB3100_LDO_H,
  72         AB3100_LDO_K,
  73         AB3100_LDO_EXT,
  74         AB3100_BUCK,
  75         AB3100_BUCK_SLEEP,
  76         AB3100_LDO_D,
  77 };
  78
  79 /* Preset (hardware defined) voltages for these regulators */
  80 #define LDO_A_VOLTAGE 2750000
  81 #define LDO_C_VOLTAGE 2650000
  82 #define LDO_D_VOLTAGE 2650000
  83
  84 static const int ldo_e_buck_typ_voltages[] = {
  85         1800000,
  86         1400000,
  87         1300000,
  88         1200000,
  89         1100000,
  90         1050000,
  91         900000,
  92 };
  93
  94 static const int ldo_f_typ_voltages[] = {
  95         1800000,
  96         1400000,
  97         1300000,
  98         1200000,
  99         1100000,
 100         1050000,
 101         2500000,
 102         2650000,
 103 };
 104
 105 static const int ldo_g_typ_voltages[] = {
 106         2850000,
 107         2750000,
 108         1800000,
 109         1500000,
 110 };
 111
 112 static const int ldo_h_typ_voltages[] = {
 113         2750000,
 114         1800000,
 115         1500000,
 116         1200000,
 117 };
 118
 119 static const int ldo_k_typ_voltages[] = {
 120         2750000,
 121         1800000,
 122 };
 123
 124
 125 /* The regulator devices */
 126 static struct ab3100_regulator
 127 ab3100_regulators[AB3100_NUM_REGULATORS] = {
 128         {
 129                 .regreg = AB3100_LDO_A,
 130                 .fixed_voltage = LDO_A_VOLTAGE,
 131         },
 132         {
 133                 .regreg = AB3100_LDO_C,
 134                 .fixed_voltage = LDO_C_VOLTAGE,
 135         },
 136         {
 137                 .regreg = AB3100_LDO_D,
 138                 .fixed_voltage = LDO_D_VOLTAGE,
 139         },
 140         {
 141                 .regreg = AB3100_LDO_E,
 142                 .typ_voltages = ldo_e_buck_typ_voltages,
 143                 .voltages_len = ARRAY_SIZE(ldo_e_buck_typ_voltages),
 144         },
 145         {
 146                 .regreg = AB3100_LDO_F,
 147                 .typ_voltages = ldo_f_typ_voltages,
 148                 .voltages_len = ARRAY_SIZE(ldo_f_typ_voltages),
 149         },
 150         {
 151                 .regreg = AB3100_LDO_G,
 152                 .typ_voltages = ldo_g_typ_voltages,
 153                 .voltages_len = ARRAY_SIZE(ldo_g_typ_voltages),
 154         },
 155         {
 156                 .regreg = AB3100_LDO_H,
 157                 .typ_voltages = ldo_h_typ_voltages,
 158                 .voltages_len = ARRAY_SIZE(ldo_h_typ_voltages),
 159         },
 160         {
 161                 .regreg = AB3100_LDO_K,
 162                 .typ_voltages = ldo_k_typ_voltages,
 163                 .voltages_len = ARRAY_SIZE(ldo_k_typ_voltages),
 164         },
 165         {
 166                 .regreg = AB3100_LDO_EXT,
 167                 /* No voltages for the external regulator */
 168         },
 169         {
 170                 .regreg = AB3100_BUCK,
 171                 .typ_voltages = ldo_e_buck_typ_voltages,
 172                 .voltages_len = ARRAY_SIZE(ldo_e_buck_typ_voltages),
 173         },
 174 };
 175
 176 /*
 177  * General functions for enable, disable and is_enabled used for
 178  * LDO: A,C,E,F,G,H,K,EXT and BUCK
 179  */
 180 static int ab3100_enable_regulator(struct regulator_dev *reg)
 181 {
 182         struct ab3100_regulator *abreg = reg->reg_data;
 183         int err;
 184         u8 regval;
 185
 186         err = abx500_get_register_interruptible(abreg->dev, 0, abreg->regreg,
 187                                                 &regval);
 188         if (err) {
 189                 dev_warn(&reg->dev, "failed to get regid %d value\n",
 190                          abreg->regreg);
 191                 return err;
 192         }
 193
 194         /* The regulator is already on, no reason to go further */
 195         if (regval & AB3100_REG_ON_MASK)
 196                 return 0;
 197
 198         regval |= AB3100_REG_ON_MASK;
 199
 200         err = abx500_set_register_interruptible(abreg->dev, 0, abreg->regreg,
 201                                                 regval);
 202         if (err) {
 203                 dev_warn(&reg->dev, "failed to set regid %d value\n",
 204                          abreg->regreg);
 205                 return err;
 206         }
 207
 208         return 0;
 209 }
 210
 211 static int ab3100_disable_regulator(struct regulator_dev *reg)
 212 {
 213         struct ab3100_regulator *abreg = reg->reg_data;
 214         int err;
 215         u8 regval;
 216
 217         /*
 218          * LDO D is a special regulator. When it is disabled, the entire
 219          * system is shut down. So this is handled specially.
 220          */
 221         pr_info("Called ab3100_disable_regulator\n");
 222         if (abreg->regreg == AB3100_LDO_D) {
 223                 dev_info(&reg->dev, "disabling LDO D - shut down system\n");
 224                 /* Setting LDO D to 0x00 cuts the power to the SoC */
 225                 return abx500_set_register_interruptible(abreg->dev, 0,
 226                                                          AB3100_LDO_D, 0x00U);
 227         }
 228
 229         /*
 230          * All other regulators are handled here
 231          */
 232         err = abx500_get_register_interruptible(abreg->dev, 0, abreg->regreg,
 233                                                 &regval);
 234         if (err) {
 235                 dev_err(&reg->dev, "unable to get register 0x%x\n",
 236                         abreg->regreg);
 237                 return err;
 238         }
 239         regval &= ~AB3100_REG_ON_MASK;
 240         return abx500_set_register_interruptible(abreg->dev, 0, abreg->regreg,
 241                                                  regval);
 242 }
 243
 244 static int ab3100_is_enabled_regulator(struct regulator_dev *reg)
 245 {
 246         struct ab3100_regulator *abreg = reg->reg_data;
 247         u8 regval;
 248         int err;
 249
 250         err = abx500_get_register_interruptible(abreg->dev, 0, abreg->regreg,
 251                                                 &regval);
 252         if (err) {
 253                 dev_err(&reg->dev, "unable to get register 0x%x\n",
 254                         abreg->regreg);
 255                 return err;
 256         }
 257
 258         return regval & AB3100_REG_ON_MASK;
 259 }
 260
 261 static int ab3100_list_voltage_regulator(struct regulator_dev *reg,
 262                                          unsigned selector)
 263 {
 264         struct ab3100_regulator *abreg = reg->reg_data;
 265
 266         if (selector >= abreg->voltages_len)
 267                 return -EINVAL;
 268         return abreg->typ_voltages[selector];
 269 }
 270
 271 static int ab3100_get_voltage_regulator(struct regulator_dev *reg)
 272 {
 273         struct ab3100_regulator *abreg = reg->reg_data;
 274         u8 regval;
 275         int err;
 276
 277         /* Return the voltage for fixed regulators immediately */
 278         if (abreg->fixed_voltage)
 279                 return abreg->fixed_voltage;
 280
 281         /*
 282          * For variable types, read out setting and index into
 283          * supplied voltage list.
 284          */
 285         err = abx500_get_register_interruptible(abreg->dev, 0,
 286                                                 abreg->regreg, &regval);
 287         if (err) {
 288                 dev_warn(&reg->dev,
 289                          "failed to get regulator value in register %02x\n",
 290                          abreg->regreg);
 291                 return err;
 292         }
 293
 294         /* The 3 highest bits index voltages */
 295         regval &= 0xE0;
 296         regval >>= 5;
 297
 298         if (regval >= abreg->voltages_len) {
 299                 dev_err(&reg->dev,
 300                         "regulator register %02x contains an illegal voltage setting\n",
 301                         abreg->regreg);
 302                 return -EINVAL;
 303         }
 304
 305         return abreg->typ_voltages[regval];
 306 }
 307
 308 static int ab3100_get_best_voltage_index(struct regulator_dev *reg,
 309                                    int min_uV, int max_uV)
 310 {
 311         struct ab3100_regulator *abreg = reg->reg_data;
 312         int i;
 313         int bestmatch;
 314         int bestindex;
 315
 316         /*
 317          * Locate the minimum voltage fitting the criteria on
 318          * this regulator. The switchable voltages are not
 319          * in strict falling order so we need to check them
 320          * all for the best match.
 321          */
 322         bestmatch = INT_MAX;
 323         bestindex = -1;
 324         for (i = 0; i < abreg->voltages_len; i++) {
 325                 if (abreg->typ_voltages[i] <= max_uV &&
 326                     abreg->typ_voltages[i] >= min_uV &&
 327                     abreg->typ_voltages[i] < bestmatch) {
 328                         bestmatch = abreg->typ_voltages[i];
 329                         bestindex = i;
 330                 }
 331         }
 332
 333         if (bestindex < 0) {
 334                 dev_warn(&reg->dev, "requested %d<=x<=%d uV, out of range!\n",
 335                          min_uV, max_uV);
 336                 return -EINVAL;
 337         }
 338         return bestindex;
 339 }
 340
 341 static int ab3100_set_voltage_regulator(struct regulator_dev *reg,
 342                                         int min_uV, int max_uV,
 343                                         unsigned *selector)
 344 {
 345         struct ab3100_regulator *abreg = reg->reg_data;
 346         u8 regval;
 347         int err;
 348         int bestindex;
 349
 350         bestindex = ab3100_get_best_voltage_index(reg, min_uV, max_uV);
 351         if (bestindex < 0)
 352                 return bestindex;
 353
 354         *selector = bestindex;
 355
 356         err = abx500_get_register_interruptible(abreg->dev, 0,
 357                                                 abreg->regreg, &regval);
 358         if (err) {
 359                 dev_warn(&reg->dev,
 360                          "failed to get regulator register %02x\n",
 361                          abreg->regreg);
 362                 return err;
 363         }
 364
 365         /* The highest three bits control the variable regulators */
 366         regval &= ~0xE0;
 367         regval |= (bestindex << 5);
 368
 369         err = abx500_set_register_interruptible(abreg->dev, 0,
 370                                                 abreg->regreg, regval);
 371         if (err)
 372                 dev_warn(&reg->dev, "failed to set regulator register %02x\n",
 373                         abreg->regreg);
 374
 375         return err;
 376 }
 377
 378 static int ab3100_set_suspend_voltage_regulator(struct regulator_dev *reg,
 379                                                 int uV)
 380 {
 381         struct ab3100_regulator *abreg = reg->reg_data;
 382         u8 regval;
 383         int err;
 384         int bestindex;
 385         u8 targetreg;
 386
 387         if (abreg->regreg == AB3100_LDO_E)
 388                 targetreg = AB3100_LDO_E_SLEEP;
 389         else if (abreg->regreg == AB3100_BUCK)
 390                 targetreg = AB3100_BUCK_SLEEP;
 391         else
 392                 return -EINVAL;
 393
 394         /* LDO E and BUCK have special suspend voltages you can set */
 395         bestindex = ab3100_get_best_voltage_index(reg, uV, uV);
 396
 397         err = abx500_get_register_interruptible(abreg->dev, 0,
 398                                                 targetreg, &regval);
 399         if (err) {
 400                 dev_warn(&reg->dev,
 401                          "failed to get regulator register %02x\n",
 402                          targetreg);
 403                 return err;
 404         }
 405
 406         /* The highest three bits control the variable regulators */
 407         regval &= ~0xE0;
 408         regval |= (bestindex << 5);
 409
 410         err = abx500_set_register_interruptible(abreg->dev, 0,
 411                                                 targetreg, regval);
 412         if (err)
 413                 dev_warn(&reg->dev, "failed to set regulator register %02x\n",
 414                         abreg->regreg);
 415
 416         return err;
 417 }
 418
 419 /*
 420  * The external regulator can just define a fixed voltage.
 421  */
 422 static int ab3100_get_voltage_regulator_external(struct regulator_dev *reg)
 423 {
 424         struct ab3100_regulator *abreg = reg->reg_data;
 425
 426         return abreg->plfdata->external_voltage;
 427 }
 428
 429 static int ab3100_enable_time_regulator(struct regulator_dev *reg)
 430 {
 431         struct ab3100_regulator *abreg = reg->reg_data;
 432
 433         /* Per-regulator power on delay from spec */
 434         switch (abreg->regreg) {
 435         case AB3100_LDO_A: /* Fallthrough */
 436         case AB3100_LDO_C: /* Fallthrough */
 437         case AB3100_LDO_D: /* Fallthrough */
 438         case AB3100_LDO_E: /* Fallthrough */
 439         case AB3100_LDO_H: /* Fallthrough */
 440         case AB3100_LDO_K:
 441                 return 200;
 442         case AB3100_LDO_F:
 443                 return 600;
 444         case AB3100_LDO_G:
 445                 return 400;
 446         case AB3100_BUCK:
 447                 return 1000;
 448         default:
 449                 break;
 450         }
 451         return 0;
 452 }
 453
 454 static struct regulator_ops regulator_ops_fixed = {
 455         .enable      = ab3100_enable_regulator,
 456         .disable     = ab3100_disable_regulator,
 457         .is_enabled  = ab3100_is_enabled_regulator,
 458         .get_voltage = ab3100_get_voltage_regulator,
 459         .enable_time = ab3100_enable_time_regulator,
 460 };
 461
 462 static struct regulator_ops regulator_ops_variable = {
 463         .enable      = ab3100_enable_regulator,
 464         .disable     = ab3100_disable_regulator,
 465         .is_enabled  = ab3100_is_enabled_regulator,
 466         .get_voltage = ab3100_get_voltage_regulator,
 467         .set_voltage = ab3100_set_voltage_regulator,
 468         .list_voltage = ab3100_list_voltage_regulator,
 469         .enable_time = ab3100_enable_time_regulator,
 470 };
 471
 472 static struct regulator_ops regulator_ops_variable_sleepable = {
 473         .enable      = ab3100_enable_regulator,
 474         .disable     = ab3100_disable_regulator,
 475         .is_enabled  = ab3100_is_enabled_regulator,
 476         .get_voltage = ab3100_get_voltage_regulator,
 477         .set_voltage = ab3100_set_voltage_regulator,
 478         .set_suspend_voltage = ab3100_set_suspend_voltage_regulator,
 479         .list_voltage = ab3100_list_voltage_regulator,
 480         .enable_time = ab3100_enable_time_regulator,
 481 };
 482
 483 /*
 484  * LDO EXT is an external regulator so it is really
 485  * not possible to set any voltage locally here, AB3100
 486  * is an on/off switch plain an simple. The external
 487  * voltage is defined in the board set-up if any.
 488  */
 489 static struct regulator_ops regulator_ops_external = {
 490         .enable      = ab3100_enable_regulator,
 491         .disable     = ab3100_disable_regulator,
 492         .is_enabled  = ab3100_is_enabled_regulator,
 493         .get_voltage = ab3100_get_voltage_regulator_external,
 494 };
 495
 496 static struct regulator_desc
 497 ab3100_regulator_desc[AB3100_NUM_REGULATORS] = {
 498         {
 499                 .name = "LDO_A",
 500                 .id   = AB3100_LDO_A,
 501                 .ops  = &regulator_ops_fixed,
 502                 .type = REGULATOR_VOLTAGE,
 503                 .owner = THIS_MODULE,
 504         },
 505         {
 506                 .name = "LDO_C",
 507                 .id   = AB3100_LDO_C,
 508                 .ops  = &regulator_ops_fixed,
 509                 .type = REGULATOR_VOLTAGE,
 510                 .owner = THIS_MODULE,
 511         },
 512         {
 513                 .name = "LDO_D",
 514                 .id   = AB3100_LDO_D,
 515                 .ops  = &regulator_ops_fixed,
 516                 .type = REGULATOR_VOLTAGE,
 517                 .owner = THIS_MODULE,
 518         },
 519         {
 520                 .name = "LDO_E",
 521                 .id   = AB3100_LDO_E,
 522                 .ops  = &regulator_ops_variable_sleepable,
 523                 .n_voltages = ARRAY_SIZE(ldo_e_buck_typ_voltages),
 524                 .type = REGULATOR_VOLTAGE,
 525                 .owner = THIS_MODULE,
 526         },
 527         {
 528                 .name = "LDO_F",
 529                 .id   = AB3100_LDO_F,
 530                 .ops  = &regulator_ops_variable,
 531                 .n_voltages = ARRAY_SIZE(ldo_f_typ_voltages),
 532                 .type = REGULATOR_VOLTAGE,
 533                 .owner = THIS_MODULE,
 534         },
 535         {
 536                 .name = "LDO_G",
 537                 .id   = AB3100_LDO_G,
 538                 .ops  = &regulator_ops_variable,
 539                 .n_voltages = ARRAY_SIZE(ldo_g_typ_voltages),
 540                 .type = REGULATOR_VOLTAGE,
 541                 .owner = THIS_MODULE,
 542         },
 543         {
 544                 .name = "LDO_H",
 545                 .id   = AB3100_LDO_H,
 546                 .ops  = &regulator_ops_variable,
 547                 .n_voltages = ARRAY_SIZE(ldo_h_typ_voltages),
 548                 .type = REGULATOR_VOLTAGE,
 549                 .owner = THIS_MODULE,
 550         },
 551         {
 552                 .name = "LDO_K",
 553                 .id   = AB3100_LDO_K,
 554                 .ops  = &regulator_ops_variable,
 555                 .n_voltages = ARRAY_SIZE(ldo_k_typ_voltages),
 556                 .type = REGULATOR_VOLTAGE,
 557                 .owner = THIS_MODULE,
 558         },
 559         {
 560                 .name = "LDO_EXT",
 561                 .id   = AB3100_LDO_EXT,
 562                 .ops  = &regulator_ops_external,
 563                 .type = REGULATOR_VOLTAGE,
 564                 .owner = THIS_MODULE,
 565         },
 566         {
 567                 .name = "BUCK",
 568                 .id   = AB3100_BUCK,
 569                 .ops  = &regulator_ops_variable_sleepable,
 570                 .n_voltages = ARRAY_SIZE(ldo_e_buck_typ_voltages),
 571                 .type = REGULATOR_VOLTAGE,
 572                 .owner = THIS_MODULE,
 573         },
 574 };
 575
 576 /*
 577  * NOTE: the following functions are regulators pluralis - it is the
 578  * binding to the AB3100 core driver and the parent platform device
 579  * for all the different regulators.
 580  */
 581
 582 static int __devinit ab3100_regulators_probe(struct platform_device *pdev)
 583 {
 584         struct ab3100_platform_data *plfdata = pdev->dev.platform_data;
 585         int err = 0;
 586         u8 data;
 587         int i;
 588
 589         /* Check chip state */
 590         err = abx500_get_register_interruptible(&pdev->dev, 0,
 591                                                 AB3100_LDO_D, &data);
 592         if (err) {
 593                 dev_err(&pdev->dev, "could not read initial status of LDO_D\n");
 594                 return err;
 595         }
 596         if (data & 0x10)
 597                 dev_notice(&pdev->dev,
 598                            "chip is already in active mode (Warm start)\n");
 599         else
 600                 dev_notice(&pdev->dev,
 601                            "chip is in inactive mode (Cold start)\n");
 602
 603         /* Set up regulators */
 604         for (i = 0; i < ARRAY_SIZE(ab3100_reg_init_order); i++) {
 605                 err = abx500_set_register_interruptible(&pdev->dev, 0,
 606                                         ab3100_reg_init_order[i],
 607                                         plfdata->reg_initvals[i]);
 608                 if (err) {
 609                         dev_err(&pdev->dev, "regulator initialization failed with error %d\n",
 610                                 err);
 611                         return err;
 612                 }
 613         }
 614
 615         /* Register the regulators */
 616         for (i = 0; i < AB3100_NUM_REGULATORS; i++) {
 617                 struct ab3100_regulator *reg = &ab3100_regulators[i];
 618                 struct regulator_dev *rdev;
 619
 620                 /*
 621                  * Initialize per-regulator struct.
 622                  * Inherit platform data, this comes down from the
 623                  * i2c boarddata, from the machine. So if you want to
 624                  * see what it looks like for a certain machine, go
 625                  * into the machine I2C setup.
 626                  */
 627                 reg->dev = &pdev->dev;
 628                 reg->plfdata = plfdata;
 629
 630                 /*
 631                  * Register the regulator, pass around
 632                  * the ab3100_regulator struct
 633                  */
 634                 rdev = regulator_register(&ab3100_regulator_desc[i],
 635                                           &pdev->dev,
 636                                           &plfdata->reg_constraints[i],
 637                                           reg);
 638
 639                 if (IS_ERR(rdev)) {
 640                         err = PTR_ERR(rdev);
 641                         dev_err(&pdev->dev,
 642                                 "%s: failed to register regulator %s err %d\n",
 643                                 __func__, ab3100_regulator_desc[i].name,
 644                                 err);
 645                         /* remove the already registered regulators */
 646                         while (--i >= 0)
 647                                 regulator_unregister(ab3100_regulators[i].rdev);
 648                         return err;
 649                 }
 650
 651                 /* Then set a pointer back to the registered regulator */
 652                 reg->rdev = rdev;
 653         }
 654
 655         return 0;
 656 }
 657
 658 static int __devexit ab3100_regulators_remove(struct platform_device *pdev)
 659 {
 660         int i;
 661
 662         for (i = 0; i < AB3100_NUM_REGULATORS; i++) {
 663                 struct ab3100_regulator *reg = &ab3100_regulators[i];
 664
 665                 regulator_unregister(reg->rdev);
 666         }
 667         return 0;
 668 }
 669
 670 static struct platform_driver ab3100_regulators_driver = {
 671         .driver = {
 672                 .name  = "ab3100-regulators",
 673                 .owner = THIS_MODULE,
 674         },
 675         .probe = ab3100_regulators_probe,
 676         .remove = __devexit_p(ab3100_regulators_remove),
 677 };
 678
 679 static __init int ab3100_regulators_init(void)
 680 {
 681         return platform_driver_register(&ab3100_regulators_driver);
 682 }
 683
 684 static __exit void ab3100_regulators_exit(void)
 685 {
 686         platform_driver_unregister(&ab3100_regulators_driver);
 687 }
 688
 689 subsys_initcall(ab3100_regulators_init);
 690 module_exit(ab3100_regulators_exit);
 691
 692 MODULE_AUTHOR("Mattias Wallin <mattias.wallin@stericsson.com>");
 693 MODULE_DESCRIPTION("AB3100 Regulator driver");
 694 MODULE_LICENSE("GPL");
 695 MODULE_ALIAS("platform:ab3100-regulators");