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 int da9055_current_limits[] = { 500000, 600000, 700000, 800000 };
  52
  53 struct da9055_conf_reg {
  54         int reg;
  55         int sel_mask;
  56         int en_mask;
  57 };
  58
  59 struct da9055_volt_reg {
  60         int reg_a;
  61         int reg_b;
  62         int sl_shift;
  63         int v_mask;
  64 };
  65
  66 struct da9055_mode_reg {
  67         int reg;
  68         int mask;
  69         int shift;
  70 };
  71
  72 struct da9055_regulator_info {
  73         struct regulator_desc reg_desc;
  74         struct da9055_conf_reg conf;
  75         struct da9055_volt_reg volt;
  76         struct da9055_mode_reg mode;
  77 };
  78
  79 struct da9055_regulator {
  80         struct da9055 *da9055;
  81         struct da9055_regulator_info *info;
  82         struct regulator_dev *rdev;
  83         enum gpio_select reg_rselect;
  84 };
  85
  86 static unsigned int da9055_buck_get_mode(struct regulator_dev *rdev)
  87 {
  88         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
  89         struct da9055_regulator_info *info = regulator->info;
  90         int ret, mode = 0;
  91
  92         ret = da9055_reg_read(regulator->da9055, info->mode.reg);
  93         if (ret < 0)
  94                 return ret;
  95
  96         switch ((ret & info->mode.mask) >> info->mode.shift) {
  97         case DA9055_BUCK_MODE_SYNC:
  98                 mode = REGULATOR_MODE_FAST;
  99                 break;
 100         case DA9055_BUCK_MODE_AUTO:
 101                 mode = REGULATOR_MODE_NORMAL;
 102                 break;
 103         case DA9055_BUCK_MODE_SLEEP:
 104                 mode = REGULATOR_MODE_STANDBY;
 105                 break;
 106         }
 107
 108         return mode;
 109 }
 110
 111 static int da9055_buck_set_mode(struct regulator_dev *rdev,
 112                                         unsigned int mode)
 113 {
 114         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 115         struct da9055_regulator_info *info = regulator->info;
 116         int val = 0;
 117
 118         switch (mode) {
 119         case REGULATOR_MODE_FAST:
 120                 val = DA9055_BUCK_MODE_SYNC << info->mode.shift;
 121                 break;
 122         case REGULATOR_MODE_NORMAL:
 123                 val = DA9055_BUCK_MODE_AUTO << info->mode.shift;
 124                 break;
 125         case REGULATOR_MODE_STANDBY:
 126                 val = DA9055_BUCK_MODE_SLEEP << info->mode.shift;
 127                 break;
 128         }
 129
 130         return da9055_reg_update(regulator->da9055, info->mode.reg,
 131                                  info->mode.mask, val);
 132 }
 133
 134 static unsigned int da9055_ldo_get_mode(struct regulator_dev *rdev)
 135 {
 136         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 137         struct da9055_regulator_info *info = regulator->info;
 138         int ret;
 139
 140         ret = da9055_reg_read(regulator->da9055, info->volt.reg_b);
 141         if (ret < 0)
 142                 return ret;
 143
 144         if (ret >> info->volt.sl_shift)
 145                 return REGULATOR_MODE_STANDBY;
 146         else
 147                 return REGULATOR_MODE_NORMAL;
 148 }
 149
 150 static int da9055_ldo_set_mode(struct regulator_dev *rdev, unsigned int mode)
 151 {
 152         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 153         struct da9055_regulator_info *info = regulator->info;
 154         struct da9055_volt_reg volt = info->volt;
 155         int val = 0;
 156
 157         switch (mode) {
 158         case REGULATOR_MODE_NORMAL:
 159         case REGULATOR_MODE_FAST:
 160                 val = DA9055_LDO_MODE_SYNC;
 161                 break;
 162         case REGULATOR_MODE_STANDBY:
 163                 val = DA9055_LDO_MODE_SLEEP;
 164                 break;
 165         }
 166
 167         return da9055_reg_update(regulator->da9055, volt.reg_b,
 168                                  1 << volt.sl_shift,
 169                                  val << volt.sl_shift);
 170 }
 171
 172 static int da9055_buck_get_current_limit(struct regulator_dev *rdev)
 173 {
 174         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 175         struct da9055_regulator_info *info = regulator->info;
 176         int ret;
 177
 178         ret = da9055_reg_read(regulator->da9055, DA9055_REG_BUCK_LIM);
 179         if (ret < 0)
 180                 return ret;
 181
 182         ret &= info->mode.mask;
 183         return da9055_current_limits[ret >> info->mode.shift];
 184 }
 185
 186 static int da9055_buck_set_current_limit(struct regulator_dev *rdev, int min_uA,
 187                                          int max_uA)
 188 {
 189         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 190         struct da9055_regulator_info *info = regulator->info;
 191         int i;
 192
 193         for (i = ARRAY_SIZE(da9055_current_limits) - 1; i >= 0; i--) {
 194                 if ((min_uA <= da9055_current_limits[i]) &&
 195                     (da9055_current_limits[i] <= max_uA))
 196                         return da9055_reg_update(regulator->da9055,
 197                                                  DA9055_REG_BUCK_LIM,
 198                                                  info->mode.mask,
 199                                                  i << info->mode.shift);
 200         }
 201
 202         return -EINVAL;
 203 }
 204
 205 static int da9055_regulator_get_voltage_sel(struct regulator_dev *rdev)
 206 {
 207         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 208         struct da9055_regulator_info *info = regulator->info;
 209         struct da9055_volt_reg volt = info->volt;
 210         int ret, sel;
 211
 212         /*
 213          * There are two voltage register set A & B for voltage ramping but
 214          * either one of then can be active therefore we first determine
 215          * the active register set.
 216          */
 217         ret = da9055_reg_read(regulator->da9055, info->conf.reg);
 218         if (ret < 0)
 219                 return ret;
 220
 221         ret &= info->conf.sel_mask;
 222
 223         /* Get the voltage for the active register set A/B */
 224         if (ret == DA9055_REGUALTOR_SET_A)
 225                 ret = da9055_reg_read(regulator->da9055, volt.reg_a);
 226         else
 227                 ret = da9055_reg_read(regulator->da9055, volt.reg_b);
 228
 229         if (ret < 0)
 230                 return ret;
 231
 232         sel = (ret & volt.v_mask);
 233         return sel;
 234 }
 235
 236 static int da9055_regulator_set_voltage_sel(struct regulator_dev *rdev,
 237                                             unsigned int selector)
 238 {
 239         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 240         struct da9055_regulator_info *info = regulator->info;
 241         int ret;
 242
 243         /*
 244          * Regulator register set A/B is not selected through GPIO therefore
 245          * we use default register set A for voltage ramping.
 246          */
 247         if (regulator->reg_rselect == NO_GPIO) {
 248                 /* Select register set A */
 249                 ret = da9055_reg_update(regulator->da9055, info->conf.reg,
 250                                         info->conf.sel_mask, DA9055_SEL_REG_A);
 251                 if (ret < 0)
 252                         return ret;
 253
 254                 /* Set the voltage */
 255                 return da9055_reg_update(regulator->da9055, info->volt.reg_a,
 256                                          info->volt.v_mask, selector);
 257         }
 258
 259         /*
 260          * Here regulator register set A/B is selected through GPIO.
 261          * Therefore we first determine the selected register set A/B and
 262          * then set the desired voltage for that register set A/B.
 263          */
 264         ret = da9055_reg_read(regulator->da9055, info->conf.reg);
 265         if (ret < 0)
 266                 return ret;
 267
 268         ret &= info->conf.sel_mask;
 269
 270         /* Set the voltage */
 271         if (ret == DA9055_REGUALTOR_SET_A)
 272                 return da9055_reg_update(regulator->da9055, info->volt.reg_a,
 273                                          info->volt.v_mask, selector);
 274         else
 275                 return da9055_reg_update(regulator->da9055, info->volt.reg_b,
 276                                          info->volt.v_mask, selector);
 277 }
 278
 279 static int da9055_regulator_set_suspend_voltage(struct regulator_dev *rdev,
 280                                                 int uV)
 281 {
 282         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 283         struct da9055_regulator_info *info = regulator->info;
 284         int ret;
 285
 286         /* Select register set B for suspend voltage ramping. */
 287         if (regulator->reg_rselect == NO_GPIO) {
 288                 ret = da9055_reg_update(regulator->da9055, info->conf.reg,
 289                                         info->conf.sel_mask, DA9055_SEL_REG_B);
 290                 if (ret < 0)
 291                         return ret;
 292         }
 293
 294         ret = regulator_map_voltage_linear(rdev, uV, uV);
 295         if (ret < 0)
 296                 return ret;
 297
 298         return da9055_reg_update(regulator->da9055, info->volt.reg_b,
 299                                  info->volt.v_mask, ret);
 300 }
 301
 302 static int da9055_suspend_enable(struct regulator_dev *rdev)
 303 {
 304         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 305         struct da9055_regulator_info *info = regulator->info;
 306
 307         /* Select register set B for voltage ramping. */
 308         if (regulator->reg_rselect == NO_GPIO)
 309                 return da9055_reg_update(regulator->da9055, info->conf.reg,
 310                                         info->conf.sel_mask, DA9055_SEL_REG_B);
 311         else
 312                 return 0;
 313 }
 314
 315 static int da9055_suspend_disable(struct regulator_dev *rdev)
 316 {
 317         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 318         struct da9055_regulator_info *info = regulator->info;
 319
 320         /* Diselect register set B. */
 321         if (regulator->reg_rselect == NO_GPIO)
 322                 return da9055_reg_update(regulator->da9055, info->conf.reg,
 323                                         info->conf.sel_mask, DA9055_SEL_REG_A);
 324         else
 325                 return 0;
 326 }
 327
 328 static const struct regulator_ops da9055_buck_ops = {
 329         .get_mode = da9055_buck_get_mode,
 330         .set_mode = da9055_buck_set_mode,
 331
 332         .get_current_limit = da9055_buck_get_current_limit,
 333         .set_current_limit = da9055_buck_set_current_limit,
 334
 335         .get_voltage_sel = da9055_regulator_get_voltage_sel,
 336         .set_voltage_sel = da9055_regulator_set_voltage_sel,
 337         .list_voltage = regulator_list_voltage_linear,
 338         .map_voltage = regulator_map_voltage_linear,
 339         .is_enabled = regulator_is_enabled_regmap,
 340         .enable = regulator_enable_regmap,
 341         .disable = regulator_disable_regmap,
 342
 343         .set_suspend_voltage = da9055_regulator_set_suspend_voltage,
 344         .set_suspend_enable = da9055_suspend_enable,
 345         .set_suspend_disable = da9055_suspend_disable,
 346         .set_suspend_mode = da9055_buck_set_mode,
 347 };
 348
 349 static const struct regulator_ops da9055_ldo_ops = {
 350         .get_mode = da9055_ldo_get_mode,
 351         .set_mode = da9055_ldo_set_mode,
 352
 353         .get_voltage_sel = da9055_regulator_get_voltage_sel,
 354         .set_voltage_sel = da9055_regulator_set_voltage_sel,
 355         .list_voltage = regulator_list_voltage_linear,
 356         .map_voltage = regulator_map_voltage_linear,
 357         .is_enabled = regulator_is_enabled_regmap,
 358         .enable = regulator_enable_regmap,
 359         .disable = regulator_disable_regmap,
 360
 361         .set_suspend_voltage = da9055_regulator_set_suspend_voltage,
 362         .set_suspend_enable = da9055_suspend_enable,
 363         .set_suspend_disable = da9055_suspend_disable,
 364         .set_suspend_mode = da9055_ldo_set_mode,
 365
 366 };
 367
 368 #define DA9055_LDO(_id, step, min, max, vbits, voffset) \
 369 {\
 370         .reg_desc = {\
 371                 .name = #_id,\
 372                 .ops = &da9055_ldo_ops,\
 373                 .type = REGULATOR_VOLTAGE,\
 374                 .id = DA9055_ID_##_id,\
 375                 .n_voltages = (max - min) / step + 1 + (voffset), \
 376                 .enable_reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
 377                 .enable_mask = 1, \
 378                 .min_uV = (min) * 1000,\
 379                 .uV_step = (step) * 1000,\
 380                 .linear_min_sel = (voffset),\
 381                 .owner = THIS_MODULE,\
 382         },\
 383         .conf = {\
 384                 .reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
 385                 .sel_mask = (1 << 4),\
 386                 .en_mask = 1,\
 387         },\
 388         .volt = {\
 389                 .reg_a = DA9055_REG_VBCORE_A + DA9055_ID_##_id, \
 390                 .reg_b = DA9055_REG_VBCORE_B + DA9055_ID_##_id, \
 391                 .sl_shift = 7,\
 392                 .v_mask = (1 << (vbits)) - 1,\
 393         },\
 394 }
 395
 396 #define DA9055_BUCK(_id, step, min, max, vbits, voffset, mbits, sbits) \
 397 {\
 398         .reg_desc = {\
 399                 .name = #_id,\
 400                 .ops = &da9055_buck_ops,\
 401                 .type = REGULATOR_VOLTAGE,\
 402                 .id = DA9055_ID_##_id,\
 403                 .n_voltages = (max - min) / step + 1 + (voffset), \
 404                 .enable_reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
 405                 .enable_mask = 1,\
 406                 .min_uV = (min) * 1000,\
 407                 .uV_step = (step) * 1000,\
 408                 .linear_min_sel = (voffset),\
 409                 .owner = THIS_MODULE,\
 410         },\
 411         .conf = {\
 412                 .reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
 413                 .sel_mask = (1 << 4),\
 414                 .en_mask = 1,\
 415         },\
 416         .volt = {\
 417                 .reg_a = DA9055_REG_VBCORE_A + DA9055_ID_##_id, \
 418                 .reg_b = DA9055_REG_VBCORE_B + DA9055_ID_##_id, \
 419                 .sl_shift = 7,\
 420                 .v_mask = (1 << (vbits)) - 1,\
 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)
 453                 return 0;
 454
 455         if (pdata->gpio_ren && pdata->gpio_ren[id]) {
 456                 char name[18];
 457                 int gpio_mux = pdata->gpio_ren[id];
 458
 459                 config->ena_gpiod = pdata->ena_gpiods[id];
 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) {
 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");