drivers/regulator/da9055-regulator.c

   1 /*
   2 * Regulator driver for DA9055 PMIC
   3 *
   4 * Copyright(c) 2012 Dialog Semiconductor Ltd.
   5 *
   6 * Author: David Dajun Chen <dchen@diasemi.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 */
  14
  15 #include <linux/module.h>
  16 #include <linux/init.h>
  17 #include <linux/err.h>
  18 #include <linux/gpio.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/regulator/driver.h>
  21 #include <linux/regulator/machine.h>
  22
  23 #include <linux/mfd/da9055/core.h>
  24 #include <linux/mfd/da9055/reg.h>
  25 #include <linux/mfd/da9055/pdata.h>
  26
  27 #define DA9055_MIN_UA           0
  28 #define DA9055_MAX_UA           3
  29
  30 #define DA9055_LDO_MODE_SYNC    0
  31 #define DA9055_LDO_MODE_SLEEP   1
  32
  33 #define DA9055_BUCK_MODE_SLEEP  1
  34 #define DA9055_BUCK_MODE_SYNC   2
  35 #define DA9055_BUCK_MODE_AUTO   3
  36
  37 /* DA9055 REGULATOR IDs */
  38 #define DA9055_ID_BUCK1 0
  39 #define DA9055_ID_BUCK2 1
  40 #define DA9055_ID_LDO1          2
  41 #define DA9055_ID_LDO2          3
  42 #define DA9055_ID_LDO3          4
  43 #define DA9055_ID_LDO4          5
  44 #define DA9055_ID_LDO5          6
  45 #define DA9055_ID_LDO6          7
  46
  47 /* DA9055 BUCK current limit */
  48 static const int da9055_current_limits[] = { 500000, 600000, 700000, 800000 };
  49
  50 struct da9055_conf_reg {
  51         int reg;
  52         int sel_mask;
  53         int en_mask;
  54 };
  55
  56 struct da9055_volt_reg {
  57         int reg_a;
  58         int reg_b;
  59         int sl_shift;
  60         int v_mask;
  61         int v_shift;
  62 };
  63
  64 struct da9055_mode_reg {
  65         int reg;
  66         int mask;
  67         int shift;
  68 };
  69
  70 struct da9055_regulator_info {
  71         struct regulator_desc reg_desc;
  72         struct da9055_conf_reg conf;
  73         struct da9055_volt_reg volt;
  74         struct da9055_mode_reg mode;
  75 };
  76
  77 struct da9055_regulator {
  78         struct da9055 *da9055;
  79         struct da9055_regulator_info *info;
  80         struct regulator_dev *rdev;
  81         enum gpio_select reg_rselect;
  82 };
  83
  84 static unsigned int da9055_buck_get_mode(struct regulator_dev *rdev)
  85 {
  86         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
  87         struct da9055_regulator_info *info = regulator->info;
  88         int ret, mode = 0;
  89
  90         ret = da9055_reg_read(regulator->da9055, info->mode.reg);
  91         if (ret < 0)
  92                 return ret;
  93
  94         switch ((ret & info->mode.mask) >> info->mode.shift) {
  95         case DA9055_BUCK_MODE_SYNC:
  96                 mode = REGULATOR_MODE_FAST;
  97                 break;
  98         case DA9055_BUCK_MODE_AUTO:
  99                 mode = REGULATOR_MODE_NORMAL;
 100                 break;
 101         case DA9055_BUCK_MODE_SLEEP:
 102                 mode = REGULATOR_MODE_STANDBY;
 103                 break;
 104         }
 105
 106         return mode;
 107 }
 108
 109 static int da9055_buck_set_mode(struct regulator_dev *rdev,
 110                                         unsigned int mode)
 111 {
 112         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 113         struct da9055_regulator_info *info = regulator->info;
 114         int val = 0;
 115
 116         switch (mode) {
 117         case REGULATOR_MODE_FAST:
 118                 val = DA9055_BUCK_MODE_SYNC << info->mode.shift;
 119                 break;
 120         case REGULATOR_MODE_NORMAL:
 121                 val = DA9055_BUCK_MODE_AUTO << info->mode.shift;
 122                 break;
 123         case REGULATOR_MODE_STANDBY:
 124                 val = DA9055_BUCK_MODE_SLEEP << info->mode.shift;
 125                 break;
 126         }
 127
 128         return da9055_reg_update(regulator->da9055, info->mode.reg,
 129                                  info->mode.mask, val);
 130 }
 131
 132 static unsigned int da9055_ldo_get_mode(struct regulator_dev *rdev)
 133 {
 134         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 135         struct da9055_regulator_info *info = regulator->info;
 136         int ret;
 137
 138         ret = da9055_reg_read(regulator->da9055, info->volt.reg_b);
 139         if (ret < 0)
 140                 return ret;
 141
 142         if (ret >> info->volt.sl_shift)
 143                 return REGULATOR_MODE_STANDBY;
 144         else
 145                 return REGULATOR_MODE_NORMAL;
 146 }
 147
 148 static int da9055_ldo_set_mode(struct regulator_dev *rdev, unsigned int mode)
 149 {
 150         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 151         struct da9055_regulator_info *info = regulator->info;
 152         struct da9055_volt_reg volt = info->volt;
 153         int val = 0;
 154
 155         switch (mode) {
 156         case REGULATOR_MODE_NORMAL:
 157         case REGULATOR_MODE_FAST:
 158                 val = DA9055_LDO_MODE_SYNC;
 159                 break;
 160         case REGULATOR_MODE_STANDBY:
 161                 val = DA9055_LDO_MODE_SLEEP;
 162                 break;
 163         }
 164
 165         return da9055_reg_update(regulator->da9055, volt.reg_b,
 166                                  1 << volt.sl_shift,
 167                                  val << volt.sl_shift);
 168 }
 169
 170 static int da9055_buck_get_current_limit(struct regulator_dev *rdev)
 171 {
 172         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 173         struct da9055_regulator_info *info = regulator->info;
 174         int ret;
 175
 176         ret = da9055_reg_read(regulator->da9055, DA9055_REG_BUCK_LIM);
 177         if (ret < 0)
 178                 return ret;
 179
 180         ret &= info->mode.mask;
 181         return da9055_current_limits[ret >> info->mode.shift];
 182 }
 183
 184 static int da9055_buck_set_current_limit(struct regulator_dev *rdev, int min_uA,
 185                                          int max_uA)
 186 {
 187         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 188         struct da9055_regulator_info *info = regulator->info;
 189         int i;
 190
 191         for (i = ARRAY_SIZE(da9055_current_limits) - 1; i >= 0; i--) {
 192                 if ((min_uA <= da9055_current_limits[i]) &&
 193                     (da9055_current_limits[i] <= max_uA))
 194                         return da9055_reg_update(regulator->da9055,
 195                                                  DA9055_REG_BUCK_LIM,
 196                                                  info->mode.mask,
 197                                                  i << info->mode.shift);
 198         }
 199
 200         return -EINVAL;
 201 }
 202
 203 static int da9055_regulator_get_voltage_sel(struct regulator_dev *rdev)
 204 {
 205         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 206         struct da9055_regulator_info *info = regulator->info;
 207         struct da9055_volt_reg volt = info->volt;
 208         int ret, sel;
 209
 210         /*
 211          * There are two voltage register set A & B for voltage ramping but
 212          * either one of then can be active therefore we first determine
 213          * the active register set.
 214          */
 215         ret = da9055_reg_read(regulator->da9055, info->conf.reg);
 216         if (ret < 0)
 217                 return ret;
 218
 219         ret &= info->conf.sel_mask;
 220
 221         /* Get the voltage for the active register set A/B */
 222         if (ret == DA9055_REGUALTOR_SET_A)
 223                 ret = da9055_reg_read(regulator->da9055, volt.reg_a);
 224         else
 225                 ret = da9055_reg_read(regulator->da9055, volt.reg_b);
 226
 227         if (ret < 0)
 228                 return ret;
 229
 230         sel = (ret & volt.v_mask);
 231         return sel;
 232 }
 233
 234 static int da9055_regulator_set_voltage_sel(struct regulator_dev *rdev,
 235                                             unsigned int selector)
 236 {
 237         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 238         struct da9055_regulator_info *info = regulator->info;
 239         int ret;
 240
 241         /*
 242          * Regulator register set A/B is not selected through GPIO therefore
 243          * we use default register set A for voltage ramping.
 244          */
 245         if (regulator->reg_rselect == NO_GPIO) {
 246                 /* Select register set A */
 247                 ret = da9055_reg_update(regulator->da9055, info->conf.reg,
 248                                         info->conf.sel_mask, DA9055_SEL_REG_A);
 249                 if (ret < 0)
 250                         return ret;
 251
 252                 /* Set the voltage */
 253                 return da9055_reg_update(regulator->da9055, info->volt.reg_a,
 254                                          info->volt.v_mask, selector);
 255         }
 256
 257         /*
 258          * Here regulator register set A/B is selected through GPIO.
 259          * Therefore we first determine the selected register set A/B and
 260          * then set the desired voltage for that register set A/B.
 261          */
 262         ret = da9055_reg_read(regulator->da9055, info->conf.reg);
 263         if (ret < 0)
 264                 return ret;
 265
 266         ret &= info->conf.sel_mask;
 267
 268         /* Set the voltage */
 269         if (ret == DA9055_REGUALTOR_SET_A)
 270                 return da9055_reg_update(regulator->da9055, info->volt.reg_a,
 271                                          info->volt.v_mask, selector);
 272         else
 273                 return da9055_reg_update(regulator->da9055, info->volt.reg_b,
 274                                          info->volt.v_mask, selector);
 275 }
 276
 277 static int da9055_regulator_set_suspend_voltage(struct regulator_dev *rdev,
 278                                                 int uV)
 279 {
 280         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 281         struct da9055_regulator_info *info = regulator->info;
 282         int ret;
 283
 284         /* Select register set B for suspend voltage ramping. */
 285         if (regulator->reg_rselect == NO_GPIO) {
 286                 ret = da9055_reg_update(regulator->da9055, info->conf.reg,
 287                                         info->conf.sel_mask, DA9055_SEL_REG_B);
 288                 if (ret < 0)
 289                         return ret;
 290         }
 291
 292         ret = regulator_map_voltage_linear(rdev, uV, uV);
 293         if (ret < 0)
 294                 return ret;
 295
 296         return da9055_reg_update(regulator->da9055, info->volt.reg_b,
 297                                  info->volt.v_mask, ret);
 298 }
 299
 300 static int da9055_suspend_enable(struct regulator_dev *rdev)
 301 {
 302         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 303         struct da9055_regulator_info *info = regulator->info;
 304
 305         /* Select register set B for voltage ramping. */
 306         if (regulator->reg_rselect == NO_GPIO)
 307                 return da9055_reg_update(regulator->da9055, info->conf.reg,
 308                                         info->conf.sel_mask, DA9055_SEL_REG_B);
 309         else
 310                 return 0;
 311 }
 312
 313 static int da9055_suspend_disable(struct regulator_dev *rdev)
 314 {
 315         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 316         struct da9055_regulator_info *info = regulator->info;
 317
 318         /* Diselect register set B. */
 319         if (regulator->reg_rselect == NO_GPIO)
 320                 return da9055_reg_update(regulator->da9055, info->conf.reg,
 321                                         info->conf.sel_mask, DA9055_SEL_REG_A);
 322         else
 323                 return 0;
 324 }
 325
 326 static struct regulator_ops da9055_buck_ops = {
 327         .get_mode = da9055_buck_get_mode,
 328         .set_mode = da9055_buck_set_mode,
 329
 330         .get_current_limit = da9055_buck_get_current_limit,
 331         .set_current_limit = da9055_buck_set_current_limit,
 332
 333         .get_voltage_sel = da9055_regulator_get_voltage_sel,
 334         .set_voltage_sel = da9055_regulator_set_voltage_sel,
 335         .list_voltage = regulator_list_voltage_linear,
 336         .map_voltage = regulator_map_voltage_linear,
 337         .is_enabled = regulator_is_enabled_regmap,
 338         .enable = regulator_enable_regmap,
 339         .disable = regulator_disable_regmap,
 340
 341         .set_suspend_voltage = da9055_regulator_set_suspend_voltage,
 342         .set_suspend_enable = da9055_suspend_enable,
 343         .set_suspend_disable = da9055_suspend_disable,
 344         .set_suspend_mode = da9055_buck_set_mode,
 345 };
 346
 347 static struct regulator_ops da9055_ldo_ops = {
 348         .get_mode = da9055_ldo_get_mode,
 349         .set_mode = da9055_ldo_set_mode,
 350
 351         .get_voltage_sel = da9055_regulator_get_voltage_sel,
 352         .set_voltage_sel = da9055_regulator_set_voltage_sel,
 353         .list_voltage = regulator_list_voltage_linear,
 354         .map_voltage = regulator_map_voltage_linear,
 355         .is_enabled = regulator_is_enabled_regmap,
 356         .enable = regulator_enable_regmap,
 357         .disable = regulator_disable_regmap,
 358
 359         .set_suspend_voltage = da9055_regulator_set_suspend_voltage,
 360         .set_suspend_enable = da9055_suspend_enable,
 361         .set_suspend_disable = da9055_suspend_disable,
 362         .set_suspend_mode = da9055_ldo_set_mode,
 363
 364 };
 365
 366 #define DA9055_LDO(_id, step, min, max, vbits, voffset) \
 367 {\
 368         .reg_desc = {\
 369                 .name = #_id,\
 370                 .ops = &da9055_ldo_ops,\
 371                 .type = REGULATOR_VOLTAGE,\
 372                 .id = DA9055_ID_##_id,\
 373                 .n_voltages = (max - min) / step + 1 + (voffset), \
 374                 .enable_reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
 375                 .enable_mask = 1, \
 376                 .min_uV = (min) * 1000,\
 377                 .uV_step = (step) * 1000,\
 378                 .linear_min_sel = (voffset),\
 379                 .owner = THIS_MODULE,\
 380         },\
 381         .conf = {\
 382                 .reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
 383                 .sel_mask = (1 << 4),\
 384                 .en_mask = 1,\
 385         },\
 386         .volt = {\
 387                 .reg_a = DA9055_REG_VBCORE_A + DA9055_ID_##_id, \
 388                 .reg_b = DA9055_REG_VBCORE_B + DA9055_ID_##_id, \
 389                 .sl_shift = 7,\
 390                 .v_mask = (1 << (vbits)) - 1,\
 391                 .v_shift = (vbits),\
 392         },\
 393 }
 394
 395 #define DA9055_BUCK(_id, step, min, max, vbits, voffset, mbits, sbits) \
 396 {\
 397         .reg_desc = {\
 398                 .name = #_id,\
 399                 .ops = &da9055_buck_ops,\
 400                 .type = REGULATOR_VOLTAGE,\
 401                 .id = DA9055_ID_##_id,\
 402                 .n_voltages = (max - min) / step + 1 + (voffset), \
 403                 .enable_reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
 404                 .enable_mask = 1,\
 405                 .min_uV = (min) * 1000,\
 406                 .uV_step = (step) * 1000,\
 407                 .linear_min_sel = (voffset),\
 408                 .owner = THIS_MODULE,\
 409         },\
 410         .conf = {\
 411                 .reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
 412                 .sel_mask = (1 << 4),\
 413                 .en_mask = 1,\
 414         },\
 415         .volt = {\
 416                 .reg_a = DA9055_REG_VBCORE_A + DA9055_ID_##_id, \
 417                 .reg_b = DA9055_REG_VBCORE_B + DA9055_ID_##_id, \
 418                 .sl_shift = 7,\
 419                 .v_mask = (1 << (vbits)) - 1,\
 420                 .v_shift = (vbits),\
 421         },\
 422         .mode = {\
 423                 .reg = DA9055_REG_BCORE_MODE,\
 424                 .mask = (mbits),\
 425                 .shift = (sbits),\
 426         },\
 427 }
 428
 429 static struct da9055_regulator_info da9055_regulator_info[] = {
 430         DA9055_BUCK(BUCK1, 25, 725, 2075, 6, 9, 0xc, 2),
 431         DA9055_BUCK(BUCK2, 25, 925, 2500, 6, 0, 3, 0),
 432         DA9055_LDO(LDO1, 50, 900, 3300, 6, 2),
 433         DA9055_LDO(LDO2, 50, 900, 3300, 6, 3),
 434         DA9055_LDO(LDO3, 50, 900, 3300, 6, 2),
 435         DA9055_LDO(LDO4, 50, 900, 3300, 6, 2),
 436         DA9055_LDO(LDO5, 50, 900, 2750, 6, 2),
 437         DA9055_LDO(LDO6, 20, 900, 3300, 7, 0),
 438 };
 439
 440 /*
 441  * Configures regulator to be controlled either through GPIO 1 or 2.
 442  * GPIO can control regulator state and/or select the regulator register
 443  * set A/B for voltage ramping.
 444  */
 445 static int da9055_gpio_init(struct da9055_regulator *regulator,
 446                             struct regulator_config *config,
 447                             struct da9055_pdata *pdata, int id)
 448 {
 449         struct da9055_regulator_info *info = regulator->info;
 450         int ret = 0;
 451
 452         if (pdata->gpio_ren && pdata->gpio_ren[id]) {
 453                 char name[18];
 454                 int gpio_mux = pdata->gpio_ren[id];
 455
 456                 config->ena_gpio = pdata->ena_gpio[id];
 457                 config->ena_gpio_flags = GPIOF_OUT_INIT_HIGH;
 458                 config->ena_gpio_invert = 1;
 459
 460                 /*
 461                  * GPI pin is muxed with regulator to control the
 462                  * regulator state.
 463                  */
 464                 sprintf(name, "DA9055 GPI %d", gpio_mux);
 465                 ret = devm_gpio_request_one(config->dev, gpio_mux, GPIOF_DIR_IN,
 466                                             name);
 467                 if (ret < 0)
 468                         goto err;
 469
 470                 /*
 471                  * Let the regulator know that its state is controlled
 472                  * through GPI.
 473                  */
 474                 ret = da9055_reg_update(regulator->da9055, info->conf.reg,
 475                                         DA9055_E_GPI_MASK,
 476                                         pdata->reg_ren[id]
 477                                         << DA9055_E_GPI_SHIFT);
 478                 if (ret < 0)
 479                         goto err;
 480         }
 481
 482         if (pdata->gpio_rsel && pdata->gpio_rsel[id]) {
 483                 char name[18];
 484                 int gpio_mux = pdata->gpio_rsel[id];
 485
 486                 regulator->reg_rselect = pdata->reg_rsel[id];
 487
 488                 /*
 489                  * GPI pin is muxed with regulator to select the
 490                  * regulator register set A/B for voltage ramping.
 491                  */
 492                 sprintf(name, "DA9055 GPI %d", gpio_mux);
 493                 ret = devm_gpio_request_one(config->dev, gpio_mux, GPIOF_DIR_IN,
 494                                             name);
 495                 if (ret < 0)
 496                         goto err;
 497
 498                 /*
 499                  * Let the regulator know that its register set A/B
 500                  * will be selected through GPI for voltage ramping.
 501                  */
 502                 ret = da9055_reg_update(regulator->da9055, info->conf.reg,
 503                                         DA9055_V_GPI_MASK,
 504                                         pdata->reg_rsel[id]
 505                                         << DA9055_V_GPI_SHIFT);
 506         }
 507
 508 err:
 509         return ret;
 510 }
 511
 512 static irqreturn_t da9055_ldo5_6_oc_irq(int irq, void *data)
 513 {
 514         struct da9055_regulator *regulator = data;
 515
 516         regulator_notifier_call_chain(regulator->rdev,
 517                                       REGULATOR_EVENT_OVER_CURRENT, NULL);
 518
 519         return IRQ_HANDLED;
 520 }
 521
 522 static inline struct da9055_regulator_info *find_regulator_info(int id)
 523 {
 524         struct da9055_regulator_info *info;
 525         int i;
 526
 527         for (i = 0; i < ARRAY_SIZE(da9055_regulator_info); i++) {
 528                 info = &da9055_regulator_info[i];
 529                 if (info->reg_desc.id == id)
 530                         return info;
 531         }
 532
 533         return NULL;
 534 }
 535
 536 static int da9055_regulator_probe(struct platform_device *pdev)
 537 {
 538         struct regulator_config config = { };
 539         struct da9055_regulator *regulator;
 540         struct da9055 *da9055 = dev_get_drvdata(pdev->dev.parent);
 541         struct da9055_pdata *pdata = da9055->dev->platform_data;
 542         int ret, irq;
 543
 544         if (pdata == NULL || pdata->regulators[pdev->id] == NULL)
 545                 return -ENODEV;
 546
 547         regulator = devm_kzalloc(&pdev->dev, sizeof(struct da9055_regulator),
 548                                  GFP_KERNEL);
 549         if (!regulator)
 550                 return -ENOMEM;
 551
 552         regulator->info = find_regulator_info(pdev->id);
 553         if (regulator->info == NULL) {
 554                 dev_err(&pdev->dev, "invalid regulator ID specified\n");
 555                 return -EINVAL;
 556         }
 557
 558         regulator->da9055 = da9055;
 559         config.dev = &pdev->dev;
 560         config.driver_data = regulator;
 561         config.regmap = da9055->regmap;
 562
 563         if (pdata && pdata->regulators)
 564                 config.init_data = pdata->regulators[pdev->id];
 565
 566         ret = da9055_gpio_init(regulator, &config, pdata, pdev->id);
 567         if (ret < 0)
 568                 return ret;
 569
 570         regulator->rdev = regulator_register(&regulator->info->reg_desc,
 571                                              &config);
 572         if (IS_ERR(regulator->rdev)) {
 573                 dev_err(&pdev->dev, "Failed to register regulator %s\n",
 574                         regulator->info->reg_desc.name);
 575                 ret = PTR_ERR(regulator->rdev);
 576                 return ret;
 577         }
 578
 579         /* Only LDO 5 and 6 has got the over current interrupt */
 580         if (pdev->id == DA9055_ID_LDO5 || pdev->id ==  DA9055_ID_LDO6) {
 581                 irq = platform_get_irq_byname(pdev, "REGULATOR");
 582                 irq = regmap_irq_get_virq(da9055->irq_data, irq);
 583                 ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
 584                                                 da9055_ldo5_6_oc_irq,
 585                                                 IRQF_TRIGGER_HIGH |
 586                                                 IRQF_ONESHOT |
 587                                                 IRQF_PROBE_SHARED,
 588                                                 pdev->name, regulator);
 589                 if (ret != 0) {
 590                         if (ret != -EBUSY) {
 591                                 dev_err(&pdev->dev,
 592                                 "Failed to request Regulator IRQ %d: %d\n",
 593                                 irq, ret);
 594                                 goto err_regulator;
 595                         }
 596                 }
 597         }
 598
 599         platform_set_drvdata(pdev, regulator);
 600
 601         return 0;
 602
 603 err_regulator:
 604         regulator_unregister(regulator->rdev);
 605         return ret;
 606 }
 607
 608 static int da9055_regulator_remove(struct platform_device *pdev)
 609 {
 610         struct da9055_regulator *regulator = platform_get_drvdata(pdev);
 611
 612         regulator_unregister(regulator->rdev);
 613
 614         return 0;
 615 }
 616
 617 static struct platform_driver da9055_regulator_driver = {
 618         .probe = da9055_regulator_probe,
 619         .remove = da9055_regulator_remove,
 620         .driver = {
 621                 .name = "da9055-regulator",
 622                 .owner = THIS_MODULE,
 623         },
 624 };
 625
 626 static int __init da9055_regulator_init(void)
 627 {
 628         return platform_driver_register(&da9055_regulator_driver);
 629 }
 630 subsys_initcall(da9055_regulator_init);
 631
 632 static void __exit da9055_regulator_exit(void)
 633 {
 634         platform_driver_unregister(&da9055_regulator_driver);
 635 }
 636 module_exit(da9055_regulator_exit);
 637
 638 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
 639 MODULE_DESCRIPTION("Power Regulator driver for Dialog DA9055 PMIC");
 640 MODULE_LICENSE("GPL");
 641 MODULE_ALIAS("platform:da9055-regulator");