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/gpio/consumer.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/regulator/driver.h>
  22 #include <linux/regulator/machine.h>
  23 #include <linux/of.h>
  24 #include <linux/regulator/of_regulator.h>
  25
  26 #include <linux/mfd/da9055/core.h>
  27 #include <linux/mfd/da9055/reg.h>
  28 #include <linux/mfd/da9055/pdata.h>
  29
  30 #define DA9055_MIN_UA           0
  31 #define DA9055_MAX_UA           3
  32
  33 #define DA9055_LDO_MODE_SYNC    0
  34 #define DA9055_LDO_MODE_SLEEP   1
  35
  36 #define DA9055_BUCK_MODE_SLEEP  1
  37 #define DA9055_BUCK_MODE_SYNC   2
  38 #define DA9055_BUCK_MODE_AUTO   3
  39
  40 /* DA9055 REGULATOR IDs */
  41 #define DA9055_ID_BUCK1 0
  42 #define DA9055_ID_BUCK2 1
  43 #define DA9055_ID_LDO1          2
  44 #define DA9055_ID_LDO2          3
  45 #define DA9055_ID_LDO3          4
  46 #define DA9055_ID_LDO4          5
  47 #define DA9055_ID_LDO5          6
  48 #define DA9055_ID_LDO6          7
  49
  50 /* DA9055 BUCK current limit */
  51 static const unsigned int da9055_current_limits[] = {
  52         500000, 600000, 700000, 800000
  53 };
  54
  55 struct da9055_conf_reg {
  56         int reg;
  57         int sel_mask;
  58         int en_mask;
  59 };
  60
  61 struct da9055_volt_reg {
  62         int reg_a;
  63         int reg_b;
  64         int sl_shift;
  65         int v_mask;
  66 };
  67
  68 struct da9055_mode_reg {
  69         int reg;
  70         int mask;
  71         int shift;
  72 };
  73
  74 struct da9055_regulator_info {
  75         struct regulator_desc reg_desc;
  76         struct da9055_conf_reg conf;
  77         struct da9055_volt_reg volt;
  78         struct da9055_mode_reg mode;
  79 };
  80
  81 struct da9055_regulator {
  82         struct da9055 *da9055;
  83         struct da9055_regulator_info *info;
  84         struct regulator_dev *rdev;
  85         enum gpio_select reg_rselect;
  86 };
  87
  88 static unsigned int da9055_buck_get_mode(struct regulator_dev *rdev)
  89 {
  90         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
  91         struct da9055_regulator_info *info = regulator->info;
  92         int ret, mode = 0;
  93
  94         ret = da9055_reg_read(regulator->da9055, info->mode.reg);
  95         if (ret < 0)
  96                 return ret;
  97
  98         switch ((ret & info->mode.mask) >> info->mode.shift) {
  99         case DA9055_BUCK_MODE_SYNC:
 100                 mode = REGULATOR_MODE_FAST;
 101                 break;
 102         case DA9055_BUCK_MODE_AUTO:
 103                 mode = REGULATOR_MODE_NORMAL;
 104                 break;
 105         case DA9055_BUCK_MODE_SLEEP:
 106                 mode = REGULATOR_MODE_STANDBY;
 107                 break;
 108         }
 109
 110         return mode;
 111 }
 112
 113 static int da9055_buck_set_mode(struct regulator_dev *rdev,
 114                                         unsigned int mode)
 115 {
 116         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 117         struct da9055_regulator_info *info = regulator->info;
 118         int val = 0;
 119
 120         switch (mode) {
 121         case REGULATOR_MODE_FAST:
 122                 val = DA9055_BUCK_MODE_SYNC << info->mode.shift;
 123                 break;
 124         case REGULATOR_MODE_NORMAL:
 125                 val = DA9055_BUCK_MODE_AUTO << info->mode.shift;
 126                 break;
 127         case REGULATOR_MODE_STANDBY:
 128                 val = DA9055_BUCK_MODE_SLEEP << info->mode.shift;
 129                 break;
 130         }
 131
 132         return da9055_reg_update(regulator->da9055, info->mode.reg,
 133                                  info->mode.mask, val);
 134 }
 135
 136 static unsigned int da9055_ldo_get_mode(struct regulator_dev *rdev)
 137 {
 138         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 139         struct da9055_regulator_info *info = regulator->info;
 140         int ret;
 141
 142         ret = da9055_reg_read(regulator->da9055, info->volt.reg_b);
 143         if (ret < 0)
 144                 return ret;
 145
 146         if (ret >> info->volt.sl_shift)
 147                 return REGULATOR_MODE_STANDBY;
 148         else
 149                 return REGULATOR_MODE_NORMAL;
 150 }
 151
 152 static int da9055_ldo_set_mode(struct regulator_dev *rdev, unsigned int mode)
 153 {
 154         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 155         struct da9055_regulator_info *info = regulator->info;
 156         struct da9055_volt_reg volt = info->volt;
 157         int val = 0;
 158
 159         switch (mode) {
 160         case REGULATOR_MODE_NORMAL:
 161         case REGULATOR_MODE_FAST:
 162                 val = DA9055_LDO_MODE_SYNC;
 163                 break;
 164         case REGULATOR_MODE_STANDBY:
 165                 val = DA9055_LDO_MODE_SLEEP;
 166                 break;
 167         }
 168
 169         return da9055_reg_update(regulator->da9055, volt.reg_b,
 170                                  1 << volt.sl_shift,
 171                                  val << volt.sl_shift);
 172 }
 173
 174 static int da9055_regulator_get_voltage_sel(struct regulator_dev *rdev)
 175 {
 176         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 177         struct da9055_regulator_info *info = regulator->info;
 178         struct da9055_volt_reg volt = info->volt;
 179         int ret, sel;
 180
 181         /*
 182          * There are two voltage register set A & B for voltage ramping but
 183          * either one of then can be active therefore we first determine
 184          * the active register set.
 185          */
 186         ret = da9055_reg_read(regulator->da9055, info->conf.reg);
 187         if (ret < 0)
 188                 return ret;
 189
 190         ret &= info->conf.sel_mask;
 191
 192         /* Get the voltage for the active register set A/B */
 193         if (ret == DA9055_REGUALTOR_SET_A)
 194                 ret = da9055_reg_read(regulator->da9055, volt.reg_a);
 195         else
 196                 ret = da9055_reg_read(regulator->da9055, volt.reg_b);
 197
 198         if (ret < 0)
 199                 return ret;
 200
 201         sel = (ret & volt.v_mask);
 202         return sel;
 203 }
 204
 205 static int da9055_regulator_set_voltage_sel(struct regulator_dev *rdev,
 206                                             unsigned int selector)
 207 {
 208         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 209         struct da9055_regulator_info *info = regulator->info;
 210         int ret;
 211
 212         /*
 213          * Regulator register set A/B is not selected through GPIO therefore
 214          * we use default register set A for voltage ramping.
 215          */
 216         if (regulator->reg_rselect == NO_GPIO) {
 217                 /* Select register set A */
 218                 ret = da9055_reg_update(regulator->da9055, info->conf.reg,
 219                                         info->conf.sel_mask, DA9055_SEL_REG_A);
 220                 if (ret < 0)
 221                         return ret;
 222
 223                 /* Set the voltage */
 224                 return da9055_reg_update(regulator->da9055, info->volt.reg_a,
 225                                          info->volt.v_mask, selector);
 226         }
 227
 228         /*
 229          * Here regulator register set A/B is selected through GPIO.
 230          * Therefore we first determine the selected register set A/B and
 231          * then set the desired voltage for that register set A/B.
 232          */
 233         ret = da9055_reg_read(regulator->da9055, info->conf.reg);
 234         if (ret < 0)
 235                 return ret;
 236
 237         ret &= info->conf.sel_mask;
 238
 239         /* Set the voltage */
 240         if (ret == DA9055_REGUALTOR_SET_A)
 241                 return da9055_reg_update(regulator->da9055, info->volt.reg_a,
 242                                          info->volt.v_mask, selector);
 243         else
 244                 return da9055_reg_update(regulator->da9055, info->volt.reg_b,
 245                                          info->volt.v_mask, selector);
 246 }
 247
 248 static int da9055_regulator_set_suspend_voltage(struct regulator_dev *rdev,
 249                                                 int uV)
 250 {
 251         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 252         struct da9055_regulator_info *info = regulator->info;
 253         int ret;
 254
 255         /* Select register set B for suspend voltage ramping. */
 256         if (regulator->reg_rselect == NO_GPIO) {
 257                 ret = da9055_reg_update(regulator->da9055, info->conf.reg,
 258                                         info->conf.sel_mask, DA9055_SEL_REG_B);
 259                 if (ret < 0)
 260                         return ret;
 261         }
 262
 263         ret = regulator_map_voltage_linear(rdev, uV, uV);
 264         if (ret < 0)
 265                 return ret;
 266
 267         return da9055_reg_update(regulator->da9055, info->volt.reg_b,
 268                                  info->volt.v_mask, ret);
 269 }
 270
 271 static int da9055_suspend_enable(struct regulator_dev *rdev)
 272 {
 273         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 274         struct da9055_regulator_info *info = regulator->info;
 275
 276         /* Select register set B for voltage ramping. */
 277         if (regulator->reg_rselect == NO_GPIO)
 278                 return da9055_reg_update(regulator->da9055, info->conf.reg,
 279                                         info->conf.sel_mask, DA9055_SEL_REG_B);
 280         else
 281                 return 0;
 282 }
 283
 284 static int da9055_suspend_disable(struct regulator_dev *rdev)
 285 {
 286         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 287         struct da9055_regulator_info *info = regulator->info;
 288
 289         /* Diselect register set B. */
 290         if (regulator->reg_rselect == NO_GPIO)
 291                 return da9055_reg_update(regulator->da9055, info->conf.reg,
 292                                         info->conf.sel_mask, DA9055_SEL_REG_A);
 293         else
 294                 return 0;
 295 }
 296
 297 static const struct regulator_ops da9055_buck_ops = {
 298         .get_mode = da9055_buck_get_mode,
 299         .set_mode = da9055_buck_set_mode,
 300
 301         .get_current_limit = regulator_get_current_limit_regmap,
 302         .set_current_limit = regulator_set_current_limit_regmap,
 303
 304         .get_voltage_sel = da9055_regulator_get_voltage_sel,
 305         .set_voltage_sel = da9055_regulator_set_voltage_sel,
 306         .list_voltage = regulator_list_voltage_linear,
 307         .map_voltage = regulator_map_voltage_linear,
 308         .is_enabled = regulator_is_enabled_regmap,
 309         .enable = regulator_enable_regmap,
 310         .disable = regulator_disable_regmap,
 311
 312         .set_suspend_voltage = da9055_regulator_set_suspend_voltage,
 313         .set_suspend_enable = da9055_suspend_enable,
 314         .set_suspend_disable = da9055_suspend_disable,
 315         .set_suspend_mode = da9055_buck_set_mode,
 316 };
 317
 318 static const struct regulator_ops da9055_ldo_ops = {
 319         .get_mode = da9055_ldo_get_mode,
 320         .set_mode = da9055_ldo_set_mode,
 321
 322         .get_voltage_sel = da9055_regulator_get_voltage_sel,
 323         .set_voltage_sel = da9055_regulator_set_voltage_sel,
 324         .list_voltage = regulator_list_voltage_linear,
 325         .map_voltage = regulator_map_voltage_linear,
 326         .is_enabled = regulator_is_enabled_regmap,
 327         .enable = regulator_enable_regmap,
 328         .disable = regulator_disable_regmap,
 329
 330         .set_suspend_voltage = da9055_regulator_set_suspend_voltage,
 331         .set_suspend_enable = da9055_suspend_enable,
 332         .set_suspend_disable = da9055_suspend_disable,
 333         .set_suspend_mode = da9055_ldo_set_mode,
 334
 335 };
 336
 337 #define DA9055_LDO(_id, step, min, max, vbits, voffset) \
 338 {\
 339         .reg_desc = {\
 340                 .name = #_id,\
 341                 .ops = &da9055_ldo_ops,\
 342                 .type = REGULATOR_VOLTAGE,\
 343                 .id = DA9055_ID_##_id,\
 344                 .n_voltages = (max - min) / step + 1 + (voffset), \
 345                 .enable_reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
 346                 .enable_mask = 1, \
 347                 .min_uV = (min) * 1000,\
 348                 .uV_step = (step) * 1000,\
 349                 .linear_min_sel = (voffset),\
 350                 .owner = THIS_MODULE,\
 351         },\
 352         .conf = {\
 353                 .reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
 354                 .sel_mask = (1 << 4),\
 355                 .en_mask = 1,\
 356         },\
 357         .volt = {\
 358                 .reg_a = DA9055_REG_VBCORE_A + DA9055_ID_##_id, \
 359                 .reg_b = DA9055_REG_VBCORE_B + DA9055_ID_##_id, \
 360                 .sl_shift = 7,\
 361                 .v_mask = (1 << (vbits)) - 1,\
 362         },\
 363 }
 364
 365 #define DA9055_BUCK(_id, step, min, max, vbits, voffset, mbits, sbits) \
 366 {\
 367         .reg_desc = {\
 368                 .name = #_id,\
 369                 .ops = &da9055_buck_ops,\
 370                 .type = REGULATOR_VOLTAGE,\
 371                 .id = DA9055_ID_##_id,\
 372                 .n_voltages = (max - min) / step + 1 + (voffset), \
 373                 .enable_reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
 374                 .enable_mask = 1,\
 375                 .min_uV = (min) * 1000,\
 376                 .uV_step = (step) * 1000,\
 377                 .linear_min_sel = (voffset),\
 378                 .owner = THIS_MODULE,\
 379                 .curr_table = da9055_current_limits,\
 380                 .n_current_limits = ARRAY_SIZE(da9055_current_limits),\
 381                 .csel_reg = DA9055_REG_BUCK_LIM,\
 382                 .csel_mask = (mbits),\
 383         },\
 384         .conf = {\
 385                 .reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
 386                 .sel_mask = (1 << 4),\
 387                 .en_mask = 1,\
 388         },\
 389         .volt = {\
 390                 .reg_a = DA9055_REG_VBCORE_A + DA9055_ID_##_id, \
 391                 .reg_b = DA9055_REG_VBCORE_B + DA9055_ID_##_id, \
 392                 .sl_shift = 7,\
 393                 .v_mask = (1 << (vbits)) - 1,\
 394         },\
 395         .mode = {\
 396                 .reg = DA9055_REG_BCORE_MODE,\
 397                 .mask = (mbits),\
 398                 .shift = (sbits),\
 399         },\
 400 }
 401
 402 static struct da9055_regulator_info da9055_regulator_info[] = {
 403         DA9055_BUCK(BUCK1, 25, 725, 2075, 6, 9, 0xc, 2),
 404         DA9055_BUCK(BUCK2, 25, 925, 2500, 6, 0, 3, 0),
 405         DA9055_LDO(LDO1, 50, 900, 3300, 6, 2),
 406         DA9055_LDO(LDO2, 50, 900, 3300, 6, 3),
 407         DA9055_LDO(LDO3, 50, 900, 3300, 6, 2),
 408         DA9055_LDO(LDO4, 50, 900, 3300, 6, 2),
 409         DA9055_LDO(LDO5, 50, 900, 2750, 6, 2),
 410         DA9055_LDO(LDO6, 20, 900, 3300, 7, 0),
 411 };
 412
 413 /*
 414  * Configures regulator to be controlled either through GPIO 1 or 2.
 415  * GPIO can control regulator state and/or select the regulator register
 416  * set A/B for voltage ramping.
 417  */
 418 static int da9055_gpio_init(struct da9055_regulator *regulator,
 419                             struct regulator_config *config,
 420                             struct da9055_pdata *pdata, int id)
 421 {
 422         struct da9055_regulator_info *info = regulator->info;
 423         int ret = 0;
 424
 425         if (!pdata)
 426                 return 0;
 427
 428         if (pdata->gpio_ren && pdata->gpio_ren[id]) {
 429                 char name[18];
 430                 int gpio_mux = pdata->gpio_ren[id];
 431
 432                 config->ena_gpiod = pdata->ena_gpiods[id];
 433
 434                 /*
 435                  * GPI pin is muxed with regulator to control the
 436                  * regulator state.
 437                  */
 438                 sprintf(name, "DA9055 GPI %d", gpio_mux);
 439                 ret = devm_gpio_request_one(config->dev, gpio_mux, GPIOF_DIR_IN,
 440                                             name);
 441                 if (ret < 0)
 442                         goto err;
 443
 444                 /*
 445                  * Let the regulator know that its state is controlled
 446                  * through GPI.
 447                  */
 448                 ret = da9055_reg_update(regulator->da9055, info->conf.reg,
 449                                         DA9055_E_GPI_MASK,
 450                                         pdata->reg_ren[id]
 451                                         << DA9055_E_GPI_SHIFT);
 452                 if (ret < 0)
 453                         goto err;
 454         }
 455
 456         if (pdata->gpio_rsel && pdata->gpio_rsel[id]) {
 457                 char name[18];
 458                 int gpio_mux = pdata->gpio_rsel[id];
 459
 460                 regulator->reg_rselect = pdata->reg_rsel[id];
 461
 462                 /*
 463                  * GPI pin is muxed with regulator to select the
 464                  * regulator register set A/B for voltage ramping.
 465                  */
 466                 sprintf(name, "DA9055 GPI %d", gpio_mux);
 467                 ret = devm_gpio_request_one(config->dev, gpio_mux, GPIOF_DIR_IN,
 468                                             name);
 469                 if (ret < 0)
 470                         goto err;
 471
 472                 /*
 473                  * Let the regulator know that its register set A/B
 474                  * will be selected through GPI for voltage ramping.
 475                  */
 476                 ret = da9055_reg_update(regulator->da9055, info->conf.reg,
 477                                         DA9055_V_GPI_MASK,
 478                                         pdata->reg_rsel[id]
 479                                         << DA9055_V_GPI_SHIFT);
 480         }
 481
 482 err:
 483         return ret;
 484 }
 485
 486 static irqreturn_t da9055_ldo5_6_oc_irq(int irq, void *data)
 487 {
 488         struct da9055_regulator *regulator = data;
 489
 490         regulator_lock(regulator->rdev);
 491         regulator_notifier_call_chain(regulator->rdev,
 492                                       REGULATOR_EVENT_OVER_CURRENT, NULL);
 493         regulator_unlock(regulator->rdev);
 494
 495         return IRQ_HANDLED;
 496 }
 497
 498 static inline struct da9055_regulator_info *find_regulator_info(int id)
 499 {
 500         struct da9055_regulator_info *info;
 501         int i;
 502
 503         for (i = 0; i < ARRAY_SIZE(da9055_regulator_info); i++) {
 504                 info = &da9055_regulator_info[i];
 505                 if (info->reg_desc.id == id)
 506                         return info;
 507         }
 508
 509         return NULL;
 510 }
 511
 512 #ifdef CONFIG_OF
 513 static struct of_regulator_match da9055_reg_matches[] = {
 514         { .name = "BUCK1", },
 515         { .name = "BUCK2", },
 516         { .name = "LDO1", },
 517         { .name = "LDO2", },
 518         { .name = "LDO3", },
 519         { .name = "LDO4", },
 520         { .name = "LDO5", },
 521         { .name = "LDO6", },
 522 };
 523
 524 static int da9055_regulator_dt_init(struct platform_device *pdev,
 525                                     struct da9055_regulator *regulator,
 526                                     struct regulator_config *config,
 527                                     int regid)
 528 {
 529         struct device_node *nproot, *np;
 530         int ret;
 531
 532         nproot = of_node_get(pdev->dev.parent->of_node);
 533         if (!nproot)
 534                 return -ENODEV;
 535
 536         np = of_get_child_by_name(nproot, "regulators");
 537         if (!np)
 538                 return -ENODEV;
 539
 540         ret = of_regulator_match(&pdev->dev, np, &da9055_reg_matches[regid], 1);
 541         of_node_put(nproot);
 542         if (ret < 0) {
 543                 dev_err(&pdev->dev, "Error matching regulator: %d\n", ret);
 544                 return ret;
 545         }
 546
 547         config->init_data = da9055_reg_matches[regid].init_data;
 548         config->of_node = da9055_reg_matches[regid].of_node;
 549
 550         if (!config->of_node)
 551                 return -ENODEV;
 552
 553         return 0;
 554 }
 555 #else
 556 static inline int da9055_regulator_dt_init(struct platform_device *pdev,
 557                                        struct da9055_regulator *regulator,
 558                                        struct regulator_config *config,
 559                                        int regid)
 560 {
 561         return -ENODEV;
 562 }
 563 #endif /* CONFIG_OF */
 564
 565 static int da9055_regulator_probe(struct platform_device *pdev)
 566 {
 567         struct regulator_config config = { };
 568         struct da9055_regulator *regulator;
 569         struct da9055 *da9055 = dev_get_drvdata(pdev->dev.parent);
 570         struct da9055_pdata *pdata = dev_get_platdata(da9055->dev);
 571         int ret, irq;
 572
 573         regulator = devm_kzalloc(&pdev->dev, sizeof(struct da9055_regulator),
 574                                  GFP_KERNEL);
 575         if (!regulator)
 576                 return -ENOMEM;
 577
 578         regulator->info = find_regulator_info(pdev->id);
 579         if (regulator->info == NULL) {
 580                 dev_err(&pdev->dev, "invalid regulator ID specified\n");
 581                 return -EINVAL;
 582         }
 583
 584         regulator->da9055 = da9055;
 585         config.dev = &pdev->dev;
 586         config.driver_data = regulator;
 587         config.regmap = da9055->regmap;
 588
 589         if (pdata) {
 590                 config.init_data = pdata->regulators[pdev->id];
 591         } else {
 592                 ret = da9055_regulator_dt_init(pdev, regulator, &config,
 593                                                pdev->id);
 594                 if (ret < 0)
 595                         return ret;
 596         }
 597
 598         ret = da9055_gpio_init(regulator, &config, pdata, pdev->id);
 599         if (ret < 0)
 600                 return ret;
 601
 602         regulator->rdev = devm_regulator_register(&pdev->dev,
 603                                                   &regulator->info->reg_desc,
 604                                                   &config);
 605         if (IS_ERR(regulator->rdev)) {
 606                 dev_err(&pdev->dev, "Failed to register regulator %s\n",
 607                         regulator->info->reg_desc.name);
 608                 return PTR_ERR(regulator->rdev);
 609         }
 610
 611         /* Only LDO 5 and 6 has got the over current interrupt */
 612         if (pdev->id == DA9055_ID_LDO5 || pdev->id ==  DA9055_ID_LDO6) {
 613                 irq = platform_get_irq_byname(pdev, "REGULATOR");
 614                 if (irq < 0)
 615                         return irq;
 616
 617                 ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
 618                                                 da9055_ldo5_6_oc_irq,
 619                                                 IRQF_TRIGGER_HIGH |
 620                                                 IRQF_ONESHOT |
 621                                                 IRQF_PROBE_SHARED,
 622                                                 pdev->name, regulator);
 623                 if (ret != 0) {
 624                         if (ret != -EBUSY) {
 625                                 dev_err(&pdev->dev,
 626                                 "Failed to request Regulator IRQ %d: %d\n",
 627                                 irq, ret);
 628                                 return ret;
 629                         }
 630                 }
 631         }
 632
 633         platform_set_drvdata(pdev, regulator);
 634
 635         return 0;
 636 }
 637
 638 static struct platform_driver da9055_regulator_driver = {
 639         .probe = da9055_regulator_probe,
 640         .driver = {
 641                 .name = "da9055-regulator",
 642         },
 643 };
 644
 645 static int __init da9055_regulator_init(void)
 646 {
 647         return platform_driver_register(&da9055_regulator_driver);
 648 }
 649 subsys_initcall(da9055_regulator_init);
 650
 651 static void __exit da9055_regulator_exit(void)
 652 {
 653         platform_driver_unregister(&da9055_regulator_driver);
 654 }
 655 module_exit(da9055_regulator_exit);
 656
 657 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
 658 MODULE_DESCRIPTION("Power Regulator driver for Dialog DA9055 PMIC");
 659 MODULE_LICENSE("GPL");
 660 MODULE_ALIAS("platform:da9055-regulator");