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 #include <linux/of.h>
  23 #include <linux/regulator/of_regulator.h>
  24
  25 #include <linux/mfd/da9055/core.h>
  26 #include <linux/mfd/da9055/reg.h>
  27 #include <linux/mfd/da9055/pdata.h>
  28
  29 #define DA9055_MIN_UA           0
  30 #define DA9055_MAX_UA           3
  31
  32 #define DA9055_LDO_MODE_SYNC    0
  33 #define DA9055_LDO_MODE_SLEEP   1
  34
  35 #define DA9055_BUCK_MODE_SLEEP  1
  36 #define DA9055_BUCK_MODE_SYNC   2
  37 #define DA9055_BUCK_MODE_AUTO   3
  38
  39 /* DA9055 REGULATOR IDs */
  40 #define DA9055_ID_BUCK1 0
  41 #define DA9055_ID_BUCK2 1
  42 #define DA9055_ID_LDO1          2
  43 #define DA9055_ID_LDO2          3
  44 #define DA9055_ID_LDO3          4
  45 #define DA9055_ID_LDO4          5
  46 #define DA9055_ID_LDO5          6
  47 #define DA9055_ID_LDO6          7
  48
  49 /* DA9055 BUCK current limit */
  50 static const int da9055_current_limits[] = { 500000, 600000, 700000, 800000 };
  51
  52 struct da9055_conf_reg {
  53         int reg;
  54         int sel_mask;
  55         int en_mask;
  56 };
  57
  58 struct da9055_volt_reg {
  59         int reg_a;
  60         int reg_b;
  61         int sl_shift;
  62         int v_mask;
  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_regulator_get_voltage_sel(struct regulator_dev *rdev)
 205 {
 206         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 207         struct da9055_regulator_info *info = regulator->info;
 208         struct da9055_volt_reg volt = info->volt;
 209         int ret, sel;
 210
 211         /*
 212          * There are two voltage register set A & B for voltage ramping but
 213          * either one of then can be active therefore we first determine
 214          * the active register set.
 215          */
 216         ret = da9055_reg_read(regulator->da9055, info->conf.reg);
 217         if (ret < 0)
 218                 return ret;
 219
 220         ret &= info->conf.sel_mask;
 221
 222         /* Get the voltage for the active register set A/B */
 223         if (ret == DA9055_REGUALTOR_SET_A)
 224                 ret = da9055_reg_read(regulator->da9055, volt.reg_a);
 225         else
 226                 ret = da9055_reg_read(regulator->da9055, volt.reg_b);
 227
 228         if (ret < 0)
 229                 return ret;
 230
 231         sel = (ret & volt.v_mask);
 232         return sel;
 233 }
 234
 235 static int da9055_regulator_set_voltage_sel(struct regulator_dev *rdev,
 236                                             unsigned int selector)
 237 {
 238         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 239         struct da9055_regulator_info *info = regulator->info;
 240         int ret;
 241
 242         /*
 243          * Regulator register set A/B is not selected through GPIO therefore
 244          * we use default register set A for voltage ramping.
 245          */
 246         if (regulator->reg_rselect == NO_GPIO) {
 247                 /* Select register set A */
 248                 ret = da9055_reg_update(regulator->da9055, info->conf.reg,
 249                                         info->conf.sel_mask, DA9055_SEL_REG_A);
 250                 if (ret < 0)
 251                         return ret;
 252
 253                 /* Set the voltage */
 254                 return da9055_reg_update(regulator->da9055, info->volt.reg_a,
 255                                          info->volt.v_mask, selector);
 256         }
 257
 258         /*
 259          * Here regulator register set A/B is selected through GPIO.
 260          * Therefore we first determine the selected register set A/B and
 261          * then set the desired voltage for that register set A/B.
 262          */
 263         ret = da9055_reg_read(regulator->da9055, info->conf.reg);
 264         if (ret < 0)
 265                 return ret;
 266
 267         ret &= info->conf.sel_mask;
 268
 269         /* Set the voltage */
 270         if (ret == DA9055_REGUALTOR_SET_A)
 271                 return da9055_reg_update(regulator->da9055, info->volt.reg_a,
 272                                          info->volt.v_mask, selector);
 273         else
 274                 return da9055_reg_update(regulator->da9055, info->volt.reg_b,
 275                                          info->volt.v_mask, selector);
 276 }
 277
 278 static int da9055_regulator_set_suspend_voltage(struct regulator_dev *rdev,
 279                                                 int uV)
 280 {
 281         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 282         struct da9055_regulator_info *info = regulator->info;
 283         int ret;
 284
 285         /* Select register set B for suspend voltage ramping. */
 286         if (regulator->reg_rselect == NO_GPIO) {
 287                 ret = da9055_reg_update(regulator->da9055, info->conf.reg,
 288                                         info->conf.sel_mask, DA9055_SEL_REG_B);
 289                 if (ret < 0)
 290                         return ret;
 291         }
 292
 293         ret = regulator_map_voltage_linear(rdev, uV, uV);
 294         if (ret < 0)
 295                 return ret;
 296
 297         return da9055_reg_update(regulator->da9055, info->volt.reg_b,
 298                                  info->volt.v_mask, ret);
 299 }
 300
 301 static int da9055_suspend_enable(struct regulator_dev *rdev)
 302 {
 303         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 304         struct da9055_regulator_info *info = regulator->info;
 305
 306         /* Select register set B for voltage ramping. */
 307         if (regulator->reg_rselect == NO_GPIO)
 308                 return da9055_reg_update(regulator->da9055, info->conf.reg,
 309                                         info->conf.sel_mask, DA9055_SEL_REG_B);
 310         else
 311                 return 0;
 312 }
 313
 314 static int da9055_suspend_disable(struct regulator_dev *rdev)
 315 {
 316         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 317         struct da9055_regulator_info *info = regulator->info;
 318
 319         /* Diselect register set B. */
 320         if (regulator->reg_rselect == NO_GPIO)
 321                 return da9055_reg_update(regulator->da9055, info->conf.reg,
 322                                         info->conf.sel_mask, DA9055_SEL_REG_A);
 323         else
 324                 return 0;
 325 }
 326
 327 static const struct regulator_ops da9055_buck_ops = {
 328         .get_mode = da9055_buck_get_mode,
 329         .set_mode = da9055_buck_set_mode,
 330
 331         .get_current_limit = da9055_buck_get_current_limit,
 332         .set_current_limit = da9055_buck_set_current_limit,
 333
 334         .get_voltage_sel = da9055_regulator_get_voltage_sel,
 335         .set_voltage_sel = da9055_regulator_set_voltage_sel,
 336         .list_voltage = regulator_list_voltage_linear,
 337         .map_voltage = regulator_map_voltage_linear,
 338         .is_enabled = regulator_is_enabled_regmap,
 339         .enable = regulator_enable_regmap,
 340         .disable = regulator_disable_regmap,
 341
 342         .set_suspend_voltage = da9055_regulator_set_suspend_voltage,
 343         .set_suspend_enable = da9055_suspend_enable,
 344         .set_suspend_disable = da9055_suspend_disable,
 345         .set_suspend_mode = da9055_buck_set_mode,
 346 };
 347
 348 static const struct regulator_ops da9055_ldo_ops = {
 349         .get_mode = da9055_ldo_get_mode,
 350         .set_mode = da9055_ldo_set_mode,
 351
 352         .get_voltage_sel = da9055_regulator_get_voltage_sel,
 353         .set_voltage_sel = da9055_regulator_set_voltage_sel,
 354         .list_voltage = regulator_list_voltage_linear,
 355         .map_voltage = regulator_map_voltage_linear,
 356         .is_enabled = regulator_is_enabled_regmap,
 357         .enable = regulator_enable_regmap,
 358         .disable = regulator_disable_regmap,
 359
 360         .set_suspend_voltage = da9055_regulator_set_suspend_voltage,
 361         .set_suspend_enable = da9055_suspend_enable,
 362         .set_suspend_disable = da9055_suspend_disable,
 363         .set_suspend_mode = da9055_ldo_set_mode,
 364
 365 };
 366
 367 #define DA9055_LDO(_id, step, min, max, vbits, voffset) \
 368 {\
 369         .reg_desc = {\
 370                 .name = #_id,\
 371                 .ops = &da9055_ldo_ops,\
 372                 .type = REGULATOR_VOLTAGE,\
 373                 .id = DA9055_ID_##_id,\
 374                 .n_voltages = (max - min) / step + 1 + (voffset), \
 375                 .enable_reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
 376                 .enable_mask = 1, \
 377                 .min_uV = (min) * 1000,\
 378                 .uV_step = (step) * 1000,\
 379                 .linear_min_sel = (voffset),\
 380                 .owner = THIS_MODULE,\
 381         },\
 382         .conf = {\
 383                 .reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
 384                 .sel_mask = (1 << 4),\
 385                 .en_mask = 1,\
 386         },\
 387         .volt = {\
 388                 .reg_a = DA9055_REG_VBCORE_A + DA9055_ID_##_id, \
 389                 .reg_b = DA9055_REG_VBCORE_B + DA9055_ID_##_id, \
 390                 .sl_shift = 7,\
 391                 .v_mask = (1 << (vbits)) - 1,\
 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         },\
 421         .mode = {\
 422                 .reg = DA9055_REG_BCORE_MODE,\
 423                 .mask = (mbits),\
 424                 .shift = (sbits),\
 425         },\
 426 }
 427
 428 static struct da9055_regulator_info da9055_regulator_info[] = {
 429         DA9055_BUCK(BUCK1, 25, 725, 2075, 6, 9, 0xc, 2),
 430         DA9055_BUCK(BUCK2, 25, 925, 2500, 6, 0, 3, 0),
 431         DA9055_LDO(LDO1, 50, 900, 3300, 6, 2),
 432         DA9055_LDO(LDO2, 50, 900, 3300, 6, 3),
 433         DA9055_LDO(LDO3, 50, 900, 3300, 6, 2),
 434         DA9055_LDO(LDO4, 50, 900, 3300, 6, 2),
 435         DA9055_LDO(LDO5, 50, 900, 2750, 6, 2),
 436         DA9055_LDO(LDO6, 20, 900, 3300, 7, 0),
 437 };
 438
 439 /*
 440  * Configures regulator to be controlled either through GPIO 1 or 2.
 441  * GPIO can control regulator state and/or select the regulator register
 442  * set A/B for voltage ramping.
 443  */
 444 static int da9055_gpio_init(struct da9055_regulator *regulator,
 445                             struct regulator_config *config,
 446                             struct da9055_pdata *pdata, int id)
 447 {
 448         struct da9055_regulator_info *info = regulator->info;
 449         int ret = 0;
 450
 451         if (!pdata)
 452                 return 0;
 453
 454         if (pdata->gpio_ren && pdata->gpio_ren[id]) {
 455                 char name[18];
 456                 int gpio_mux = pdata->gpio_ren[id];
 457
 458                 config->ena_gpio = pdata->ena_gpio[id];
 459                 config->ena_gpio_flags = GPIOF_OUT_INIT_HIGH;
 460                 config->ena_gpio_invert = 1;
 461
 462                 /*
 463                  * GPI pin is muxed with regulator to control the
 464                  * regulator state.
 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 state is controlled
 474                  * through GPI.
 475                  */
 476                 ret = da9055_reg_update(regulator->da9055, info->conf.reg,
 477                                         DA9055_E_GPI_MASK,
 478                                         pdata->reg_ren[id]
 479                                         << DA9055_E_GPI_SHIFT);
 480                 if (ret < 0)
 481                         goto err;
 482         }
 483
 484         if (pdata->gpio_rsel && pdata->gpio_rsel[id]) {
 485                 char name[18];
 486                 int gpio_mux = pdata->gpio_rsel[id];
 487
 488                 regulator->reg_rselect = pdata->reg_rsel[id];
 489
 490                 /*
 491                  * GPI pin is muxed with regulator to select the
 492                  * regulator register set A/B for voltage ramping.
 493                  */
 494                 sprintf(name, "DA9055 GPI %d", gpio_mux);
 495                 ret = devm_gpio_request_one(config->dev, gpio_mux, GPIOF_DIR_IN,
 496                                             name);
 497                 if (ret < 0)
 498                         goto err;
 499
 500                 /*
 501                  * Let the regulator know that its register set A/B
 502                  * will be selected through GPI for voltage ramping.
 503                  */
 504                 ret = da9055_reg_update(regulator->da9055, info->conf.reg,
 505                                         DA9055_V_GPI_MASK,
 506                                         pdata->reg_rsel[id]
 507                                         << DA9055_V_GPI_SHIFT);
 508         }
 509
 510 err:
 511         return ret;
 512 }
 513
 514 static irqreturn_t da9055_ldo5_6_oc_irq(int irq, void *data)
 515 {
 516         struct da9055_regulator *regulator = data;
 517
 518         regulator_notifier_call_chain(regulator->rdev,
 519                                       REGULATOR_EVENT_OVER_CURRENT, NULL);
 520
 521         return IRQ_HANDLED;
 522 }
 523
 524 static inline struct da9055_regulator_info *find_regulator_info(int id)
 525 {
 526         struct da9055_regulator_info *info;
 527         int i;
 528
 529         for (i = 0; i < ARRAY_SIZE(da9055_regulator_info); i++) {
 530                 info = &da9055_regulator_info[i];
 531                 if (info->reg_desc.id == id)
 532                         return info;
 533         }
 534
 535         return NULL;
 536 }
 537
 538 #ifdef CONFIG_OF
 539 static struct of_regulator_match da9055_reg_matches[] = {
 540         { .name = "BUCK1", },
 541         { .name = "BUCK2", },
 542         { .name = "LDO1", },
 543         { .name = "LDO2", },
 544         { .name = "LDO3", },
 545         { .name = "LDO4", },
 546         { .name = "LDO5", },
 547         { .name = "LDO6", },
 548 };
 549
 550 static int da9055_regulator_dt_init(struct platform_device *pdev,
 551                                     struct da9055_regulator *regulator,
 552                                     struct regulator_config *config,
 553                                     int regid)
 554 {
 555         struct device_node *nproot, *np;
 556         int ret;
 557
 558         nproot = of_node_get(pdev->dev.parent->of_node);
 559         if (!nproot)
 560                 return -ENODEV;
 561
 562         np = of_get_child_by_name(nproot, "regulators");
 563         if (!np)
 564                 return -ENODEV;
 565
 566         ret = of_regulator_match(&pdev->dev, np, &da9055_reg_matches[regid], 1);
 567         of_node_put(nproot);
 568         if (ret < 0) {
 569                 dev_err(&pdev->dev, "Error matching regulator: %d\n", ret);
 570                 return ret;
 571         }
 572
 573         config->init_data = da9055_reg_matches[regid].init_data;
 574         config->of_node = da9055_reg_matches[regid].of_node;
 575
 576         if (!config->of_node)
 577                 return -ENODEV;
 578
 579         return 0;
 580 }
 581 #else
 582 static inline int da9055_regulator_dt_init(struct platform_device *pdev,
 583                                        struct da9055_regulator *regulator,
 584                                        struct regulator_config *config,
 585                                        int regid)
 586 {
 587         return -ENODEV;
 588 }
 589 #endif /* CONFIG_OF */
 590
 591 static int da9055_regulator_probe(struct platform_device *pdev)
 592 {
 593         struct regulator_config config = { };
 594         struct da9055_regulator *regulator;
 595         struct da9055 *da9055 = dev_get_drvdata(pdev->dev.parent);
 596         struct da9055_pdata *pdata = dev_get_platdata(da9055->dev);
 597         int ret, irq;
 598
 599         regulator = devm_kzalloc(&pdev->dev, sizeof(struct da9055_regulator),
 600                                  GFP_KERNEL);
 601         if (!regulator)
 602                 return -ENOMEM;
 603
 604         regulator->info = find_regulator_info(pdev->id);
 605         if (regulator->info == NULL) {
 606                 dev_err(&pdev->dev, "invalid regulator ID specified\n");
 607                 return -EINVAL;
 608         }
 609
 610         regulator->da9055 = da9055;
 611         config.dev = &pdev->dev;
 612         config.driver_data = regulator;
 613         config.regmap = da9055->regmap;
 614
 615         if (pdata && pdata->regulators) {
 616                 config.init_data = pdata->regulators[pdev->id];
 617         } else {
 618                 ret = da9055_regulator_dt_init(pdev, regulator, &config,
 619                                                pdev->id);
 620                 if (ret < 0)
 621                         return ret;
 622         }
 623
 624         ret = da9055_gpio_init(regulator, &config, pdata, pdev->id);
 625         if (ret < 0)
 626                 return ret;
 627
 628         regulator->rdev = devm_regulator_register(&pdev->dev,
 629                                                   &regulator->info->reg_desc,
 630                                                   &config);
 631         if (IS_ERR(regulator->rdev)) {
 632                 dev_err(&pdev->dev, "Failed to register regulator %s\n",
 633                         regulator->info->reg_desc.name);
 634                 return PTR_ERR(regulator->rdev);
 635         }
 636
 637         /* Only LDO 5 and 6 has got the over current interrupt */
 638         if (pdev->id == DA9055_ID_LDO5 || pdev->id ==  DA9055_ID_LDO6) {
 639                 irq = platform_get_irq_byname(pdev, "REGULATOR");
 640                 if (irq < 0)
 641                         return irq;
 642
 643                 ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
 644                                                 da9055_ldo5_6_oc_irq,
 645                                                 IRQF_TRIGGER_HIGH |
 646                                                 IRQF_ONESHOT |
 647                                                 IRQF_PROBE_SHARED,
 648                                                 pdev->name, regulator);
 649                 if (ret != 0) {
 650                         if (ret != -EBUSY) {
 651                                 dev_err(&pdev->dev,
 652                                 "Failed to request Regulator IRQ %d: %d\n",
 653                                 irq, ret);
 654                                 return ret;
 655                         }
 656                 }
 657         }
 658
 659         platform_set_drvdata(pdev, regulator);
 660
 661         return 0;
 662 }
 663
 664 static struct platform_driver da9055_regulator_driver = {
 665         .probe = da9055_regulator_probe,
 666         .driver = {
 667                 .name = "da9055-regulator",
 668         },
 669 };
 670
 671 static int __init da9055_regulator_init(void)
 672 {
 673         return platform_driver_register(&da9055_regulator_driver);
 674 }
 675 subsys_initcall(da9055_regulator_init);
 676
 677 static void __exit da9055_regulator_exit(void)
 678 {
 679         platform_driver_unregister(&da9055_regulator_driver);
 680 }
 681 module_exit(da9055_regulator_exit);
 682
 683 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
 684 MODULE_DESCRIPTION("Power Regulator driver for Dialog DA9055 PMIC");
 685 MODULE_LICENSE("GPL");
 686 MODULE_ALIAS("platform:da9055-regulator");