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_offset;
  61         int v_mask;
  62         int v_shift;
  63 };
  64
  65 struct da9055_mode_reg {
  66         int reg;
  67         int mask;
  68         int shift;
  69 };
  70
  71 struct da9055_regulator_info {
  72         struct regulator_desc reg_desc;
  73         struct da9055_conf_reg conf;
  74         struct da9055_volt_reg volt;
  75         struct da9055_mode_reg mode;
  76 };
  77
  78 struct da9055_regulator {
  79         struct da9055 *da9055;
  80         struct da9055_regulator_info *info;
  81         struct regulator_dev *rdev;
  82         enum gpio_select reg_rselect;
  83 };
  84
  85 static unsigned int da9055_buck_get_mode(struct regulator_dev *rdev)
  86 {
  87         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
  88         struct da9055_regulator_info *info = regulator->info;
  89         int ret, mode = 0;
  90
  91         ret = da9055_reg_read(regulator->da9055, info->mode.reg);
  92         if (ret < 0)
  93                 return ret;
  94
  95         switch ((ret & info->mode.mask) >> info->mode.shift) {
  96         case DA9055_BUCK_MODE_SYNC:
  97                 mode = REGULATOR_MODE_FAST;
  98                 break;
  99         case DA9055_BUCK_MODE_AUTO:
 100                 mode = REGULATOR_MODE_NORMAL;
 101                 break;
 102         case DA9055_BUCK_MODE_SLEEP:
 103                 mode = REGULATOR_MODE_STANDBY;
 104                 break;
 105         }
 106
 107         return mode;
 108 }
 109
 110 static int da9055_buck_set_mode(struct regulator_dev *rdev,
 111                                         unsigned int mode)
 112 {
 113         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 114         struct da9055_regulator_info *info = regulator->info;
 115         int val = 0;
 116
 117         switch (mode) {
 118         case REGULATOR_MODE_FAST:
 119                 val = DA9055_BUCK_MODE_SYNC << info->mode.shift;
 120                 break;
 121         case REGULATOR_MODE_NORMAL:
 122                 val = DA9055_BUCK_MODE_AUTO << info->mode.shift;
 123                 break;
 124         case REGULATOR_MODE_STANDBY:
 125                 val = DA9055_BUCK_MODE_SLEEP << info->mode.shift;
 126                 break;
 127         }
 128
 129         return da9055_reg_update(regulator->da9055, info->mode.reg,
 130                                  info->mode.mask, val);
 131 }
 132
 133 static unsigned int da9055_ldo_get_mode(struct regulator_dev *rdev)
 134 {
 135         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 136         struct da9055_regulator_info *info = regulator->info;
 137         int ret;
 138
 139         ret = da9055_reg_read(regulator->da9055, info->volt.reg_b);
 140         if (ret < 0)
 141                 return ret;
 142
 143         if (ret >> info->volt.sl_shift)
 144                 return REGULATOR_MODE_STANDBY;
 145         else
 146                 return REGULATOR_MODE_NORMAL;
 147 }
 148
 149 static int da9055_ldo_set_mode(struct regulator_dev *rdev, unsigned int mode)
 150 {
 151         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 152         struct da9055_regulator_info *info = regulator->info;
 153         struct da9055_volt_reg volt = info->volt;
 154         int val = 0;
 155
 156         switch (mode) {
 157         case REGULATOR_MODE_NORMAL:
 158         case REGULATOR_MODE_FAST:
 159                 val = DA9055_LDO_MODE_SYNC;
 160                 break;
 161         case REGULATOR_MODE_STANDBY:
 162                 val = DA9055_LDO_MODE_SLEEP;
 163                 break;
 164         }
 165
 166         return da9055_reg_update(regulator->da9055, volt.reg_b,
 167                                  1 << volt.sl_shift,
 168                                  val << volt.sl_shift);
 169 }
 170
 171 static int da9055_buck_get_current_limit(struct regulator_dev *rdev)
 172 {
 173         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 174         struct da9055_regulator_info *info = regulator->info;
 175         int ret;
 176
 177         ret = da9055_reg_read(regulator->da9055, DA9055_REG_BUCK_LIM);
 178         if (ret < 0)
 179                 return ret;
 180
 181         ret &= info->mode.mask;
 182         return da9055_current_limits[ret >> info->mode.shift];
 183 }
 184
 185 static int da9055_buck_set_current_limit(struct regulator_dev *rdev, int min_uA,
 186                                          int max_uA)
 187 {
 188         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 189         struct da9055_regulator_info *info = regulator->info;
 190         int i;
 191
 192         for (i = ARRAY_SIZE(da9055_current_limits) - 1; i >= 0; i--) {
 193                 if ((min_uA <= da9055_current_limits[i]) &&
 194                     (da9055_current_limits[i] <= max_uA))
 195                         return da9055_reg_update(regulator->da9055,
 196                                                  DA9055_REG_BUCK_LIM,
 197                                                  info->mode.mask,
 198                                                  i << info->mode.shift);
 199         }
 200
 201         return -EINVAL;
 202 }
 203
 204 static int da9055_list_voltage(struct regulator_dev *rdev, unsigned selector)
 205 {
 206         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 207         struct da9055_regulator_info *info = regulator->info;
 208
 209         if (selector >= rdev->desc->n_voltages)
 210                 return -EINVAL;
 211
 212         if (selector < info->volt.v_offset)
 213                 return 0;
 214
 215         selector -= info->volt.v_offset;
 216         return rdev->desc->min_uV + (rdev->desc->uV_step * selector);
 217 }
 218
 219 static int da9055_map_voltage(struct regulator_dev *rdev, int min_uV,
 220                               int max_uV)
 221 {
 222         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 223         struct da9055_regulator_info *info = regulator->info;
 224         int sel, voltage;
 225
 226         if (min_uV < rdev->desc->min_uV)
 227                 min_uV = rdev->desc->min_uV;
 228
 229         sel = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step);
 230         sel += info->volt.v_offset;
 231
 232         voltage = da9055_list_voltage(rdev, sel);
 233         if (voltage < min_uV || voltage > max_uV)
 234                 return -EINVAL;
 235
 236         return sel;
 237 }
 238
 239 static int da9055_regulator_get_voltage_sel(struct regulator_dev *rdev)
 240 {
 241         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 242         struct da9055_regulator_info *info = regulator->info;
 243         struct da9055_volt_reg volt = info->volt;
 244         int ret, sel;
 245
 246         /*
 247          * There are two voltage register set A & B for voltage ramping but
 248          * either one of then can be active therefore we first determine
 249          * the active register set.
 250          */
 251         ret = da9055_reg_read(regulator->da9055, info->conf.reg);
 252         if (ret < 0)
 253                 return ret;
 254
 255         ret &= info->conf.sel_mask;
 256
 257         /* Get the voltage for the active register set A/B */
 258         if (ret == DA9055_REGUALTOR_SET_A)
 259                 ret = da9055_reg_read(regulator->da9055, volt.reg_a);
 260         else
 261                 ret = da9055_reg_read(regulator->da9055, volt.reg_b);
 262
 263         if (ret < 0)
 264                 return ret;
 265
 266         sel = (ret & volt.v_mask);
 267         if (sel <= volt.v_offset)
 268                 return 0;
 269         else
 270                 return sel;
 271 }
 272
 273 static int da9055_regulator_set_voltage_sel(struct regulator_dev *rdev,
 274                                             unsigned int selector)
 275 {
 276         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 277         struct da9055_regulator_info *info = regulator->info;
 278         int ret;
 279
 280         /*
 281          * Regulator register set A/B is not selected through GPIO therefore
 282          * we use default register set A for voltage ramping.
 283          */
 284         if (regulator->reg_rselect == NO_GPIO) {
 285                 /* Select register set A */
 286                 ret = da9055_reg_update(regulator->da9055, info->conf.reg,
 287                                         info->conf.sel_mask, DA9055_SEL_REG_A);
 288                 if (ret < 0)
 289                         return ret;
 290
 291                 /* Set the voltage */
 292                 return da9055_reg_update(regulator->da9055, info->volt.reg_a,
 293                                          info->volt.v_mask, selector);
 294         }
 295
 296         /*
 297          * Here regulator register set A/B is selected through GPIO.
 298          * Therefore we first determine the selected register set A/B and
 299          * then set the desired voltage for that register set A/B.
 300          */
 301         ret = da9055_reg_read(regulator->da9055, info->conf.reg);
 302         if (ret < 0)
 303                 return ret;
 304
 305         ret &= info->conf.sel_mask;
 306
 307         /* Set the voltage */
 308         if (ret == DA9055_REGUALTOR_SET_A)
 309                 return da9055_reg_update(regulator->da9055, info->volt.reg_a,
 310                                          info->volt.v_mask, selector);
 311         else
 312                 return da9055_reg_update(regulator->da9055, info->volt.reg_b,
 313                                          info->volt.v_mask, selector);
 314 }
 315
 316 static int da9055_regulator_set_suspend_voltage(struct regulator_dev *rdev,
 317                                                 int uV)
 318 {
 319         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 320         struct da9055_regulator_info *info = regulator->info;
 321         int ret;
 322
 323         /* Select register set B for suspend voltage ramping. */
 324         if (regulator->reg_rselect == NO_GPIO) {
 325                 ret = da9055_reg_update(regulator->da9055, info->conf.reg,
 326                                         info->conf.sel_mask, DA9055_SEL_REG_B);
 327                 if (ret < 0)
 328                         return ret;
 329         }
 330
 331         ret = da9055_map_voltage(rdev, uV, uV);
 332         if (ret < 0)
 333                 return ret;
 334
 335         return da9055_reg_update(regulator->da9055, info->volt.reg_b,
 336                                  info->volt.v_mask, ret);
 337 }
 338
 339 static int da9055_suspend_enable(struct regulator_dev *rdev)
 340 {
 341         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 342         struct da9055_regulator_info *info = regulator->info;
 343
 344         /* Select register set B for voltage ramping. */
 345         if (regulator->reg_rselect == NO_GPIO)
 346                 return da9055_reg_update(regulator->da9055, info->conf.reg,
 347                                         info->conf.sel_mask, DA9055_SEL_REG_B);
 348         else
 349                 return 0;
 350 }
 351
 352 static int da9055_suspend_disable(struct regulator_dev *rdev)
 353 {
 354         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 355         struct da9055_regulator_info *info = regulator->info;
 356
 357         /* Diselect register set B. */
 358         if (regulator->reg_rselect == NO_GPIO)
 359                 return da9055_reg_update(regulator->da9055, info->conf.reg,
 360                                         info->conf.sel_mask, DA9055_SEL_REG_A);
 361         else
 362                 return 0;
 363 }
 364
 365 static struct regulator_ops da9055_buck_ops = {
 366         .get_mode = da9055_buck_get_mode,
 367         .set_mode = da9055_buck_set_mode,
 368
 369         .get_current_limit = da9055_buck_get_current_limit,
 370         .set_current_limit = da9055_buck_set_current_limit,
 371
 372         .get_voltage_sel = da9055_regulator_get_voltage_sel,
 373         .set_voltage_sel = da9055_regulator_set_voltage_sel,
 374         .list_voltage = da9055_list_voltage,
 375         .map_voltage = da9055_map_voltage,
 376         .is_enabled = regulator_is_enabled_regmap,
 377         .enable = regulator_enable_regmap,
 378         .disable = regulator_disable_regmap,
 379
 380         .set_suspend_voltage = da9055_regulator_set_suspend_voltage,
 381         .set_suspend_enable = da9055_suspend_enable,
 382         .set_suspend_disable = da9055_suspend_disable,
 383         .set_suspend_mode = da9055_buck_set_mode,
 384 };
 385
 386 static struct regulator_ops da9055_ldo_ops = {
 387         .get_mode = da9055_ldo_get_mode,
 388         .set_mode = da9055_ldo_set_mode,
 389
 390         .get_voltage_sel = da9055_regulator_get_voltage_sel,
 391         .set_voltage_sel = da9055_regulator_set_voltage_sel,
 392         .list_voltage = da9055_list_voltage,
 393         .map_voltage = da9055_map_voltage,
 394         .is_enabled = regulator_is_enabled_regmap,
 395         .enable = regulator_enable_regmap,
 396         .disable = regulator_disable_regmap,
 397
 398         .set_suspend_voltage = da9055_regulator_set_suspend_voltage,
 399         .set_suspend_enable = da9055_suspend_enable,
 400         .set_suspend_disable = da9055_suspend_disable,
 401         .set_suspend_mode = da9055_ldo_set_mode,
 402
 403 };
 404
 405 #define DA9055_LDO(_id, step, min, max, vbits, voffset) \
 406 {\
 407         .reg_desc = {\
 408                 .name = #_id,\
 409                 .ops = &da9055_ldo_ops,\
 410                 .type = REGULATOR_VOLTAGE,\
 411                 .id = DA9055_ID_##_id,\
 412                 .n_voltages = (max - min) / step + 1 + (voffset), \
 413                 .enable_reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
 414                 .enable_mask = 1, \
 415                 .min_uV = (min) * 1000,\
 416                 .uV_step = (step) * 1000,\
 417                 .owner = THIS_MODULE,\
 418         },\
 419         .conf = {\
 420                 .reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
 421                 .sel_mask = (1 << 4),\
 422                 .en_mask = 1,\
 423         },\
 424         .volt = {\
 425                 .reg_a = DA9055_REG_VBCORE_A + DA9055_ID_##_id, \
 426                 .reg_b = DA9055_REG_VBCORE_B + DA9055_ID_##_id, \
 427                 .sl_shift = 7,\
 428                 .v_offset = (voffset),\
 429                 .v_mask = (1 << (vbits)) - 1,\
 430                 .v_shift = (vbits),\
 431         },\
 432 }
 433
 434 #define DA9055_BUCK(_id, step, min, max, vbits, voffset, mbits, sbits) \
 435 {\
 436         .reg_desc = {\
 437                 .name = #_id,\
 438                 .ops = &da9055_buck_ops,\
 439                 .type = REGULATOR_VOLTAGE,\
 440                 .id = DA9055_ID_##_id,\
 441                 .n_voltages = (max - min) / step + 1 + (voffset), \
 442                 .enable_reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
 443                 .enable_mask = 1,\
 444                 .min_uV = (min) * 1000,\
 445                 .uV_step = (step) * 1000,\
 446                 .owner = THIS_MODULE,\
 447         },\
 448         .conf = {\
 449                 .reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
 450                 .sel_mask = (1 << 4),\
 451                 .en_mask = 1,\
 452         },\
 453         .volt = {\
 454                 .reg_a = DA9055_REG_VBCORE_A + DA9055_ID_##_id, \
 455                 .reg_b = DA9055_REG_VBCORE_B + DA9055_ID_##_id, \
 456                 .sl_shift = 7,\
 457                 .v_offset = (voffset),\
 458                 .v_mask = (1 << (vbits)) - 1,\
 459                 .v_shift = (vbits),\
 460         },\
 461         .mode = {\
 462                 .reg = DA9055_REG_BCORE_MODE,\
 463                 .mask = (mbits),\
 464                 .shift = (sbits),\
 465         },\
 466 }
 467
 468 static struct da9055_regulator_info da9055_regulator_info[] = {
 469         DA9055_BUCK(BUCK1, 25, 725, 2075, 6, 9, 0xc, 2),
 470         DA9055_BUCK(BUCK2, 25, 925, 2500, 6, 0, 3, 0),
 471         DA9055_LDO(LDO1, 50, 900, 3300, 6, 2),
 472         DA9055_LDO(LDO2, 50, 900, 3300, 6, 3),
 473         DA9055_LDO(LDO3, 50, 900, 3300, 6, 2),
 474         DA9055_LDO(LDO4, 50, 900, 3300, 6, 2),
 475         DA9055_LDO(LDO5, 50, 900, 2750, 6, 2),
 476         DA9055_LDO(LDO6, 20, 900, 3300, 7, 0),
 477 };
 478
 479 /*
 480  * Configures regulator to be controlled either through GPIO 1 or 2.
 481  * GPIO can control regulator state and/or select the regulator register
 482  * set A/B for voltage ramping.
 483  */
 484 static __devinit int da9055_gpio_init(struct da9055_regulator *regulator,
 485                                       struct regulator_config *config,
 486                                       struct da9055_pdata *pdata, int id)
 487 {
 488         struct da9055_regulator_info *info = regulator->info;
 489         int ret = 0;
 490
 491         if (pdata->gpio_ren && pdata->gpio_ren[id]) {
 492                 char name[18];
 493                 int gpio_mux = pdata->gpio_ren[id];
 494
 495                 config->ena_gpio = pdata->ena_gpio[id];
 496                 config->ena_gpio_flags = GPIOF_OUT_INIT_HIGH;
 497                 config->ena_gpio_invert = 1;
 498
 499                 /*
 500                  * GPI pin is muxed with regulator to control the
 501                  * regulator state.
 502                  */
 503                 sprintf(name, "DA9055 GPI %d", gpio_mux);
 504                 ret = devm_gpio_request_one(config->dev, gpio_mux, GPIOF_DIR_IN,
 505                                             name);
 506                 if (ret < 0)
 507                         goto err;
 508
 509                 /*
 510                  * Let the regulator know that its state is controlled
 511                  * through GPI.
 512                  */
 513                 ret = da9055_reg_update(regulator->da9055, info->conf.reg,
 514                                         DA9055_E_GPI_MASK,
 515                                         pdata->reg_ren[id]
 516                                         << DA9055_E_GPI_SHIFT);
 517                 if (ret < 0)
 518                         goto err;
 519         }
 520
 521         if (pdata->gpio_rsel && pdata->gpio_rsel[id]) {
 522                 char name[18];
 523                 int gpio_mux = pdata->gpio_rsel[id];
 524
 525                 regulator->reg_rselect = pdata->reg_rsel[id];
 526
 527                 /*
 528                  * GPI pin is muxed with regulator to select the
 529                  * regulator register set A/B for voltage ramping.
 530                  */
 531                 sprintf(name, "DA9055 GPI %d", gpio_mux);
 532                 ret = devm_gpio_request_one(config->dev, gpio_mux, GPIOF_DIR_IN,
 533                                             name);
 534                 if (ret < 0)
 535                         goto err;
 536
 537                 /*
 538                  * Let the regulator know that its register set A/B
 539                  * will be selected through GPI for voltage ramping.
 540                  */
 541                 ret = da9055_reg_update(regulator->da9055, info->conf.reg,
 542                                         DA9055_V_GPI_MASK,
 543                                         pdata->reg_rsel[id]
 544                                         << DA9055_V_GPI_SHIFT);
 545         }
 546
 547 err:
 548         return ret;
 549 }
 550
 551 static irqreturn_t da9055_ldo5_6_oc_irq(int irq, void *data)
 552 {
 553         struct da9055_regulator *regulator = data;
 554
 555         regulator_notifier_call_chain(regulator->rdev,
 556                                       REGULATOR_EVENT_OVER_CURRENT, NULL);
 557
 558         return IRQ_HANDLED;
 559 }
 560
 561 static inline struct da9055_regulator_info *find_regulator_info(int id)
 562 {
 563         struct da9055_regulator_info *info;
 564         int i;
 565
 566         for (i = 0; i < ARRAY_SIZE(da9055_regulator_info); i++) {
 567                 info = &da9055_regulator_info[i];
 568                 if (info->reg_desc.id == id)
 569                         return info;
 570         }
 571
 572         return NULL;
 573 }
 574
 575 static int __devinit da9055_regulator_probe(struct platform_device *pdev)
 576 {
 577         struct regulator_config config = { };
 578         struct da9055_regulator *regulator;
 579         struct da9055 *da9055 = dev_get_drvdata(pdev->dev.parent);
 580         struct da9055_pdata *pdata = da9055->dev->platform_data;
 581         int ret, irq;
 582
 583         if (pdata == NULL || pdata->regulators[pdev->id] == NULL)
 584                 return -ENODEV;
 585
 586         regulator = devm_kzalloc(&pdev->dev, sizeof(struct da9055_regulator),
 587                                  GFP_KERNEL);
 588         if (!regulator)
 589                 return -ENOMEM;
 590
 591         regulator->info = find_regulator_info(pdev->id);
 592         if (regulator->info == NULL) {
 593                 dev_err(&pdev->dev, "invalid regulator ID specified\n");
 594                 return -EINVAL;
 595         }
 596
 597         regulator->da9055 = da9055;
 598         config.dev = &pdev->dev;
 599         config.driver_data = regulator;
 600         config.regmap = da9055->regmap;
 601
 602         if (pdata && pdata->regulators)
 603                 config.init_data = pdata->regulators[pdev->id];
 604
 605         ret = da9055_gpio_init(regulator, &config, pdata, pdev->id);
 606         if (ret < 0)
 607                 return ret;
 608
 609         regulator->rdev = regulator_register(&regulator->info->reg_desc,
 610                                              &config);
 611         if (IS_ERR(regulator->rdev)) {
 612                 dev_err(&pdev->dev, "Failed to register regulator %s\n",
 613                         regulator->info->reg_desc.name);
 614                 ret = PTR_ERR(regulator->rdev);
 615                 return ret;
 616         }
 617
 618         /* Only LDO 5 and 6 has got the over current interrupt */
 619         if (pdev->id == DA9055_ID_LDO5 || pdev->id ==  DA9055_ID_LDO6) {
 620                 irq = platform_get_irq_byname(pdev, "REGULATOR");
 621                 irq = regmap_irq_get_virq(da9055->irq_data, irq);
 622                 ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
 623                                                 da9055_ldo5_6_oc_irq,
 624                                                 IRQF_TRIGGER_HIGH |
 625                                                 IRQF_ONESHOT |
 626                                                 IRQF_PROBE_SHARED,
 627                                                 pdev->name, regulator);
 628                 if (ret != 0) {
 629                         if (ret != -EBUSY) {
 630                                 dev_err(&pdev->dev,
 631                                 "Failed to request Regulator IRQ %d: %d\n",
 632                                 irq, ret);
 633                                 goto err_regulator;
 634                         }
 635                 }
 636         }
 637
 638         platform_set_drvdata(pdev, regulator);
 639
 640         return 0;
 641
 642 err_regulator:
 643         regulator_unregister(regulator->rdev);
 644         return ret;
 645 }
 646
 647 static int __devexit da9055_regulator_remove(struct platform_device *pdev)
 648 {
 649         struct da9055_regulator *regulator = platform_get_drvdata(pdev);
 650
 651         regulator_unregister(regulator->rdev);
 652
 653         return 0;
 654 }
 655
 656 static struct platform_driver da9055_regulator_driver = {
 657         .probe = da9055_regulator_probe,
 658         .remove = __devexit_p(da9055_regulator_remove),
 659         .driver = {
 660                 .name = "da9055-regulator",
 661                 .owner = THIS_MODULE,
 662         },
 663 };
 664
 665 static int __init da9055_regulator_init(void)
 666 {
 667         return platform_driver_register(&da9055_regulator_driver);
 668 }
 669 subsys_initcall(da9055_regulator_init);
 670
 671 static void __exit da9055_regulator_exit(void)
 672 {
 673         platform_driver_unregister(&da9055_regulator_driver);
 674 }
 675 module_exit(da9055_regulator_exit);
 676
 677 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
 678 MODULE_DESCRIPTION("Power Regulator driver for Dialog DA9055 PMIC");
 679 MODULE_LICENSE("GPL");
 680 MODULE_ALIAS("platform:da9055-regulator");