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