drivers/regulator/wm831x-ldo.c

   1 /*
   2  * wm831x-ldo.c  --  LDO driver for the WM831x series
   3  *
   4  * Copyright 2009 Wolfson Microelectronics PLC.
   5  *
   6  * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
   7  *
   8  *  This program is free software; you can redistribute  it and/or modify it
   9  *  under  the terms of  the GNU General  Public License as published by the
  10  *  Free Software Foundation;  either version 2 of the  License, or (at your
  11  *  option) any later version.
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/moduleparam.h>
  16 #include <linux/init.h>
  17 #include <linux/bitops.h>
  18 #include <linux/err.h>
  19 #include <linux/i2c.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/regulator/driver.h>
  22 #include <linux/slab.h>
  23
  24 #include <linux/mfd/wm831x/core.h>
  25 #include <linux/mfd/wm831x/regulator.h>
  26 #include <linux/mfd/wm831x/pdata.h>
  27
  28 #define WM831X_LDO_MAX_NAME 9
  29
  30 #define WM831X_LDO_CONTROL       0
  31 #define WM831X_LDO_ON_CONTROL    1
  32 #define WM831X_LDO_SLEEP_CONTROL 2
  33
  34 #define WM831X_ALIVE_LDO_ON_CONTROL    0
  35 #define WM831X_ALIVE_LDO_SLEEP_CONTROL 1
  36
  37 struct wm831x_ldo {
  38         char name[WM831X_LDO_MAX_NAME];
  39         char supply_name[WM831X_LDO_MAX_NAME];
  40         struct regulator_desc desc;
  41         int base;
  42         struct wm831x *wm831x;
  43         struct regulator_dev *regulator;
  44 };
  45
  46 /*
  47  * Shared
  48  */
  49
  50 static irqreturn_t wm831x_ldo_uv_irq(int irq, void *data)
  51 {
  52         struct wm831x_ldo *ldo = data;
  53
  54         regulator_notifier_call_chain(ldo->regulator,
  55                                       REGULATOR_EVENT_UNDER_VOLTAGE,
  56                                       NULL);
  57
  58         return IRQ_HANDLED;
  59 }
  60
  61 /*
  62  * General purpose LDOs
  63  */
  64
  65 static const struct regulator_linear_range wm831x_gp_ldo_ranges[] = {
  66         REGULATOR_LINEAR_RANGE(900000, 0, 14, 50000),
  67         REGULATOR_LINEAR_RANGE(1700000, 15, 31, 100000),
  68 };
  69
  70 static int wm831x_gp_ldo_set_suspend_voltage(struct regulator_dev *rdev,
  71                                              int uV)
  72 {
  73         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
  74         struct wm831x *wm831x = ldo->wm831x;
  75         int sel, reg = ldo->base + WM831X_LDO_SLEEP_CONTROL;
  76
  77         sel = regulator_map_voltage_linear_range(rdev, uV, uV);
  78         if (sel < 0)
  79                 return sel;
  80
  81         return wm831x_set_bits(wm831x, reg, WM831X_LDO1_ON_VSEL_MASK, sel);
  82 }
  83
  84 static unsigned int wm831x_gp_ldo_get_mode(struct regulator_dev *rdev)
  85 {
  86         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
  87         struct wm831x *wm831x = ldo->wm831x;
  88         int ctrl_reg = ldo->base + WM831X_LDO_CONTROL;
  89         int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
  90         int ret;
  91
  92         ret = wm831x_reg_read(wm831x, on_reg);
  93         if (ret < 0)
  94                 return ret;
  95
  96         if (!(ret & WM831X_LDO1_ON_MODE))
  97                 return REGULATOR_MODE_NORMAL;
  98
  99         ret = wm831x_reg_read(wm831x, ctrl_reg);
 100         if (ret < 0)
 101                 return ret;
 102
 103         if (ret & WM831X_LDO1_LP_MODE)
 104                 return REGULATOR_MODE_STANDBY;
 105         else
 106                 return REGULATOR_MODE_IDLE;
 107 }
 108
 109 static int wm831x_gp_ldo_set_mode(struct regulator_dev *rdev,
 110                                   unsigned int mode)
 111 {
 112         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 113         struct wm831x *wm831x = ldo->wm831x;
 114         int ctrl_reg = ldo->base + WM831X_LDO_CONTROL;
 115         int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
 116         int ret;
 117
 118
 119         switch (mode) {
 120         case REGULATOR_MODE_NORMAL:
 121                 ret = wm831x_set_bits(wm831x, on_reg,
 122                                       WM831X_LDO1_ON_MODE, 0);
 123                 if (ret < 0)
 124                         return ret;
 125                 break;
 126
 127         case REGULATOR_MODE_IDLE:
 128                 ret = wm831x_set_bits(wm831x, ctrl_reg,
 129                                       WM831X_LDO1_LP_MODE, 0);
 130                 if (ret < 0)
 131                         return ret;
 132
 133                 ret = wm831x_set_bits(wm831x, on_reg,
 134                                       WM831X_LDO1_ON_MODE,
 135                                       WM831X_LDO1_ON_MODE);
 136                 if (ret < 0)
 137                         return ret;
 138                 break;
 139
 140         case REGULATOR_MODE_STANDBY:
 141                 ret = wm831x_set_bits(wm831x, ctrl_reg,
 142                                       WM831X_LDO1_LP_MODE,
 143                                       WM831X_LDO1_LP_MODE);
 144                 if (ret < 0)
 145                         return ret;
 146
 147                 ret = wm831x_set_bits(wm831x, on_reg,
 148                                       WM831X_LDO1_ON_MODE,
 149                                       WM831X_LDO1_ON_MODE);
 150                 if (ret < 0)
 151                         return ret;
 152                 break;
 153
 154         default:
 155                 return -EINVAL;
 156         }
 157
 158         return 0;
 159 }
 160
 161 static int wm831x_gp_ldo_get_status(struct regulator_dev *rdev)
 162 {
 163         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 164         struct wm831x *wm831x = ldo->wm831x;
 165         int mask = 1 << rdev_get_id(rdev);
 166         int ret;
 167
 168         /* Is the regulator on? */
 169         ret = wm831x_reg_read(wm831x, WM831X_LDO_STATUS);
 170         if (ret < 0)
 171                 return ret;
 172         if (!(ret & mask))
 173                 return REGULATOR_STATUS_OFF;
 174
 175         /* Is it reporting under voltage? */
 176         ret = wm831x_reg_read(wm831x, WM831X_LDO_UV_STATUS);
 177         if (ret < 0)
 178                 return ret;
 179         if (ret & mask)
 180                 return REGULATOR_STATUS_ERROR;
 181
 182         ret = wm831x_gp_ldo_get_mode(rdev);
 183         if (ret < 0)
 184                 return ret;
 185         else
 186                 return regulator_mode_to_status(ret);
 187 }
 188
 189 static unsigned int wm831x_gp_ldo_get_optimum_mode(struct regulator_dev *rdev,
 190                                                    int input_uV,
 191                                                    int output_uV, int load_uA)
 192 {
 193         if (load_uA < 20000)
 194                 return REGULATOR_MODE_STANDBY;
 195         if (load_uA < 50000)
 196                 return REGULATOR_MODE_IDLE;
 197         return REGULATOR_MODE_NORMAL;
 198 }
 199
 200
 201 static const struct regulator_ops wm831x_gp_ldo_ops = {
 202         .list_voltage = regulator_list_voltage_linear_range,
 203         .map_voltage = regulator_map_voltage_linear_range,
 204         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 205         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 206         .set_suspend_voltage = wm831x_gp_ldo_set_suspend_voltage,
 207         .get_mode = wm831x_gp_ldo_get_mode,
 208         .set_mode = wm831x_gp_ldo_set_mode,
 209         .get_status = wm831x_gp_ldo_get_status,
 210         .get_optimum_mode = wm831x_gp_ldo_get_optimum_mode,
 211         .get_bypass = regulator_get_bypass_regmap,
 212         .set_bypass = regulator_set_bypass_regmap,
 213
 214         .is_enabled = regulator_is_enabled_regmap,
 215         .enable = regulator_enable_regmap,
 216         .disable = regulator_disable_regmap,
 217 };
 218
 219 static int wm831x_gp_ldo_probe(struct platform_device *pdev)
 220 {
 221         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 222         struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
 223         struct regulator_config config = { };
 224         int id;
 225         struct wm831x_ldo *ldo;
 226         struct resource *res;
 227         int ret, irq;
 228
 229         if (pdata && pdata->wm831x_num)
 230                 id = (pdata->wm831x_num * 10) + 1;
 231         else
 232                 id = 0;
 233         id = pdev->id - id;
 234
 235         dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
 236
 237         ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ldo), GFP_KERNEL);
 238         if (!ldo)
 239                 return -ENOMEM;
 240
 241         ldo->wm831x = wm831x;
 242
 243         res = platform_get_resource(pdev, IORESOURCE_REG, 0);
 244         if (res == NULL) {
 245                 dev_err(&pdev->dev, "No REG resource\n");
 246                 ret = -EINVAL;
 247                 goto err;
 248         }
 249         ldo->base = res->start;
 250
 251         snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1);
 252         ldo->desc.name = ldo->name;
 253
 254         snprintf(ldo->supply_name, sizeof(ldo->supply_name),
 255                  "LDO%dVDD", id + 1);
 256         ldo->desc.supply_name = ldo->supply_name;
 257
 258         ldo->desc.id = id;
 259         ldo->desc.type = REGULATOR_VOLTAGE;
 260         ldo->desc.n_voltages = 32;
 261         ldo->desc.ops = &wm831x_gp_ldo_ops;
 262         ldo->desc.owner = THIS_MODULE;
 263         ldo->desc.vsel_reg = ldo->base + WM831X_LDO_ON_CONTROL;
 264         ldo->desc.vsel_mask = WM831X_LDO1_ON_VSEL_MASK;
 265         ldo->desc.enable_reg = WM831X_LDO_ENABLE;
 266         ldo->desc.enable_mask = 1 << id;
 267         ldo->desc.bypass_reg = ldo->base;
 268         ldo->desc.bypass_mask = WM831X_LDO1_SWI;
 269         ldo->desc.linear_ranges = wm831x_gp_ldo_ranges;
 270         ldo->desc.n_linear_ranges = ARRAY_SIZE(wm831x_gp_ldo_ranges);
 271
 272         config.dev = pdev->dev.parent;
 273         if (pdata)
 274                 config.init_data = pdata->ldo[id];
 275         config.driver_data = ldo;
 276         config.regmap = wm831x->regmap;
 277
 278         ldo->regulator = devm_regulator_register(&pdev->dev, &ldo->desc,
 279                                                  &config);
 280         if (IS_ERR(ldo->regulator)) {
 281                 ret = PTR_ERR(ldo->regulator);
 282                 dev_err(wm831x->dev, "Failed to register LDO%d: %d\n",
 283                         id + 1, ret);
 284                 goto err;
 285         }
 286
 287         irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
 288         ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
 289                                         wm831x_ldo_uv_irq,
 290                                         IRQF_TRIGGER_RISING | IRQF_ONESHOT,
 291                                         ldo->name,
 292                                         ldo);
 293         if (ret != 0) {
 294                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
 295                         irq, ret);
 296                 goto err;
 297         }
 298
 299         platform_set_drvdata(pdev, ldo);
 300
 301         return 0;
 302
 303 err:
 304         return ret;
 305 }
 306
 307 static struct platform_driver wm831x_gp_ldo_driver = {
 308         .probe = wm831x_gp_ldo_probe,
 309         .driver         = {
 310                 .name   = "wm831x-ldo",
 311         },
 312 };
 313
 314 /*
 315  * Analogue LDOs
 316  */
 317
 318 static const struct regulator_linear_range wm831x_aldo_ranges[] = {
 319         REGULATOR_LINEAR_RANGE(1000000, 0, 12, 50000),
 320         REGULATOR_LINEAR_RANGE(1700000, 13, 31, 100000),
 321 };
 322
 323 static int wm831x_aldo_set_suspend_voltage(struct regulator_dev *rdev,
 324                                              int uV)
 325 {
 326         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 327         struct wm831x *wm831x = ldo->wm831x;
 328         int sel, reg = ldo->base + WM831X_LDO_SLEEP_CONTROL;
 329
 330         sel = regulator_map_voltage_linear_range(rdev, uV, uV);
 331         if (sel < 0)
 332                 return sel;
 333
 334         return wm831x_set_bits(wm831x, reg, WM831X_LDO7_ON_VSEL_MASK, sel);
 335 }
 336
 337 static unsigned int wm831x_aldo_get_mode(struct regulator_dev *rdev)
 338 {
 339         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 340         struct wm831x *wm831x = ldo->wm831x;
 341         int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
 342         int ret;
 343
 344         ret = wm831x_reg_read(wm831x, on_reg);
 345         if (ret < 0)
 346                 return 0;
 347
 348         if (ret & WM831X_LDO7_ON_MODE)
 349                 return REGULATOR_MODE_IDLE;
 350         else
 351                 return REGULATOR_MODE_NORMAL;
 352 }
 353
 354 static int wm831x_aldo_set_mode(struct regulator_dev *rdev,
 355                                   unsigned int mode)
 356 {
 357         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 358         struct wm831x *wm831x = ldo->wm831x;
 359         int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
 360         int ret;
 361
 362
 363         switch (mode) {
 364         case REGULATOR_MODE_NORMAL:
 365                 ret = wm831x_set_bits(wm831x, on_reg, WM831X_LDO7_ON_MODE, 0);
 366                 if (ret < 0)
 367                         return ret;
 368                 break;
 369
 370         case REGULATOR_MODE_IDLE:
 371                 ret = wm831x_set_bits(wm831x, on_reg, WM831X_LDO7_ON_MODE,
 372                                       WM831X_LDO7_ON_MODE);
 373                 if (ret < 0)
 374                         return ret;
 375                 break;
 376
 377         default:
 378                 return -EINVAL;
 379         }
 380
 381         return 0;
 382 }
 383
 384 static int wm831x_aldo_get_status(struct regulator_dev *rdev)
 385 {
 386         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 387         struct wm831x *wm831x = ldo->wm831x;
 388         int mask = 1 << rdev_get_id(rdev);
 389         int ret;
 390
 391         /* Is the regulator on? */
 392         ret = wm831x_reg_read(wm831x, WM831X_LDO_STATUS);
 393         if (ret < 0)
 394                 return ret;
 395         if (!(ret & mask))
 396                 return REGULATOR_STATUS_OFF;
 397
 398         /* Is it reporting under voltage? */
 399         ret = wm831x_reg_read(wm831x, WM831X_LDO_UV_STATUS);
 400         if (ret < 0)
 401                 return ret;
 402         if (ret & mask)
 403                 return REGULATOR_STATUS_ERROR;
 404
 405         ret = wm831x_aldo_get_mode(rdev);
 406         if (ret < 0)
 407                 return ret;
 408         else
 409                 return regulator_mode_to_status(ret);
 410 }
 411
 412 static const struct regulator_ops wm831x_aldo_ops = {
 413         .list_voltage = regulator_list_voltage_linear_range,
 414         .map_voltage = regulator_map_voltage_linear_range,
 415         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 416         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 417         .set_suspend_voltage = wm831x_aldo_set_suspend_voltage,
 418         .get_mode = wm831x_aldo_get_mode,
 419         .set_mode = wm831x_aldo_set_mode,
 420         .get_status = wm831x_aldo_get_status,
 421         .set_bypass = regulator_set_bypass_regmap,
 422         .get_bypass = regulator_get_bypass_regmap,
 423
 424         .is_enabled = regulator_is_enabled_regmap,
 425         .enable = regulator_enable_regmap,
 426         .disable = regulator_disable_regmap,
 427 };
 428
 429 static int wm831x_aldo_probe(struct platform_device *pdev)
 430 {
 431         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 432         struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
 433         struct regulator_config config = { };
 434         int id;
 435         struct wm831x_ldo *ldo;
 436         struct resource *res;
 437         int ret, irq;
 438
 439         if (pdata && pdata->wm831x_num)
 440                 id = (pdata->wm831x_num * 10) + 1;
 441         else
 442                 id = 0;
 443         id = pdev->id - id;
 444
 445         dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
 446
 447         ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ldo), GFP_KERNEL);
 448         if (!ldo)
 449                 return -ENOMEM;
 450
 451         ldo->wm831x = wm831x;
 452
 453         res = platform_get_resource(pdev, IORESOURCE_REG, 0);
 454         if (res == NULL) {
 455                 dev_err(&pdev->dev, "No REG resource\n");
 456                 ret = -EINVAL;
 457                 goto err;
 458         }
 459         ldo->base = res->start;
 460
 461         snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1);
 462         ldo->desc.name = ldo->name;
 463
 464         snprintf(ldo->supply_name, sizeof(ldo->supply_name),
 465                  "LDO%dVDD", id + 1);
 466         ldo->desc.supply_name = ldo->supply_name;
 467
 468         ldo->desc.id = id;
 469         ldo->desc.type = REGULATOR_VOLTAGE;
 470         ldo->desc.n_voltages = 32;
 471         ldo->desc.linear_ranges = wm831x_aldo_ranges;
 472         ldo->desc.n_linear_ranges = ARRAY_SIZE(wm831x_aldo_ranges);
 473         ldo->desc.ops = &wm831x_aldo_ops;
 474         ldo->desc.owner = THIS_MODULE;
 475         ldo->desc.vsel_reg = ldo->base + WM831X_LDO_ON_CONTROL;
 476         ldo->desc.vsel_mask = WM831X_LDO7_ON_VSEL_MASK;
 477         ldo->desc.enable_reg = WM831X_LDO_ENABLE;
 478         ldo->desc.enable_mask = 1 << id;
 479         ldo->desc.bypass_reg = ldo->base;
 480         ldo->desc.bypass_mask = WM831X_LDO7_SWI;
 481
 482         config.dev = pdev->dev.parent;
 483         if (pdata)
 484                 config.init_data = pdata->ldo[id];
 485         config.driver_data = ldo;
 486         config.regmap = wm831x->regmap;
 487
 488         ldo->regulator = devm_regulator_register(&pdev->dev, &ldo->desc,
 489                                                  &config);
 490         if (IS_ERR(ldo->regulator)) {
 491                 ret = PTR_ERR(ldo->regulator);
 492                 dev_err(wm831x->dev, "Failed to register LDO%d: %d\n",
 493                         id + 1, ret);
 494                 goto err;
 495         }
 496
 497         irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
 498         ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
 499                                         wm831x_ldo_uv_irq,
 500                                         IRQF_TRIGGER_RISING | IRQF_ONESHOT,
 501                                         ldo->name, ldo);
 502         if (ret != 0) {
 503                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
 504                         irq, ret);
 505                 goto err;
 506         }
 507
 508         platform_set_drvdata(pdev, ldo);
 509
 510         return 0;
 511
 512 err:
 513         return ret;
 514 }
 515
 516 static struct platform_driver wm831x_aldo_driver = {
 517         .probe = wm831x_aldo_probe,
 518         .driver         = {
 519                 .name   = "wm831x-aldo",
 520         },
 521 };
 522
 523 /*
 524  * Alive LDO
 525  */
 526
 527 #define WM831X_ALIVE_LDO_MAX_SELECTOR 0xf
 528
 529 static int wm831x_alive_ldo_set_suspend_voltage(struct regulator_dev *rdev,
 530                                              int uV)
 531 {
 532         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 533         struct wm831x *wm831x = ldo->wm831x;
 534         int sel, reg = ldo->base + WM831X_ALIVE_LDO_SLEEP_CONTROL;
 535
 536         sel = regulator_map_voltage_linear(rdev, uV, uV);
 537         if (sel < 0)
 538                 return sel;
 539
 540         return wm831x_set_bits(wm831x, reg, WM831X_LDO11_ON_VSEL_MASK, sel);
 541 }
 542
 543 static int wm831x_alive_ldo_get_status(struct regulator_dev *rdev)
 544 {
 545         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 546         struct wm831x *wm831x = ldo->wm831x;
 547         int mask = 1 << rdev_get_id(rdev);
 548         int ret;
 549
 550         /* Is the regulator on? */
 551         ret = wm831x_reg_read(wm831x, WM831X_LDO_STATUS);
 552         if (ret < 0)
 553                 return ret;
 554         if (ret & mask)
 555                 return REGULATOR_STATUS_ON;
 556         else
 557                 return REGULATOR_STATUS_OFF;
 558 }
 559
 560 static const struct regulator_ops wm831x_alive_ldo_ops = {
 561         .list_voltage = regulator_list_voltage_linear,
 562         .map_voltage = regulator_map_voltage_linear,
 563         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 564         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 565         .set_suspend_voltage = wm831x_alive_ldo_set_suspend_voltage,
 566         .get_status = wm831x_alive_ldo_get_status,
 567
 568         .is_enabled = regulator_is_enabled_regmap,
 569         .enable = regulator_enable_regmap,
 570         .disable = regulator_disable_regmap,
 571 };
 572
 573 static int wm831x_alive_ldo_probe(struct platform_device *pdev)
 574 {
 575         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 576         struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
 577         struct regulator_config config = { };
 578         int id;
 579         struct wm831x_ldo *ldo;
 580         struct resource *res;
 581         int ret;
 582
 583         if (pdata && pdata->wm831x_num)
 584                 id = (pdata->wm831x_num * 10) + 1;
 585         else
 586                 id = 0;
 587         id = pdev->id - id;
 588
 589
 590         dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
 591
 592         ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ldo), GFP_KERNEL);
 593         if (!ldo)
 594                 return -ENOMEM;
 595
 596         ldo->wm831x = wm831x;
 597
 598         res = platform_get_resource(pdev, IORESOURCE_REG, 0);
 599         if (res == NULL) {
 600                 dev_err(&pdev->dev, "No REG resource\n");
 601                 ret = -EINVAL;
 602                 goto err;
 603         }
 604         ldo->base = res->start;
 605
 606         snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1);
 607         ldo->desc.name = ldo->name;
 608
 609         snprintf(ldo->supply_name, sizeof(ldo->supply_name),
 610                  "LDO%dVDD", id + 1);
 611         ldo->desc.supply_name = ldo->supply_name;
 612
 613         ldo->desc.id = id;
 614         ldo->desc.type = REGULATOR_VOLTAGE;
 615         ldo->desc.n_voltages = WM831X_ALIVE_LDO_MAX_SELECTOR + 1;
 616         ldo->desc.ops = &wm831x_alive_ldo_ops;
 617         ldo->desc.owner = THIS_MODULE;
 618         ldo->desc.vsel_reg = ldo->base + WM831X_ALIVE_LDO_ON_CONTROL;
 619         ldo->desc.vsel_mask = WM831X_LDO11_ON_VSEL_MASK;
 620         ldo->desc.enable_reg = WM831X_LDO_ENABLE;
 621         ldo->desc.enable_mask = 1 << id;
 622         ldo->desc.min_uV = 800000;
 623         ldo->desc.uV_step = 50000;
 624         ldo->desc.enable_time = 1000;
 625
 626         config.dev = pdev->dev.parent;
 627         if (pdata)
 628                 config.init_data = pdata->ldo[id];
 629         config.driver_data = ldo;
 630         config.regmap = wm831x->regmap;
 631
 632         ldo->regulator = devm_regulator_register(&pdev->dev, &ldo->desc,
 633                                                  &config);
 634         if (IS_ERR(ldo->regulator)) {
 635                 ret = PTR_ERR(ldo->regulator);
 636                 dev_err(wm831x->dev, "Failed to register LDO%d: %d\n",
 637                         id + 1, ret);
 638                 goto err;
 639         }
 640
 641         platform_set_drvdata(pdev, ldo);
 642
 643         return 0;
 644
 645 err:
 646         return ret;
 647 }
 648
 649 static struct platform_driver wm831x_alive_ldo_driver = {
 650         .probe = wm831x_alive_ldo_probe,
 651         .driver         = {
 652                 .name   = "wm831x-alive-ldo",
 653         },
 654 };
 655
 656 static struct platform_driver * const drivers[] = {
 657         &wm831x_gp_ldo_driver,
 658         &wm831x_aldo_driver,
 659         &wm831x_alive_ldo_driver,
 660 };
 661
 662 static int __init wm831x_ldo_init(void)
 663 {
 664         return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
 665 }
 666 subsys_initcall(wm831x_ldo_init);
 667
 668 static void __exit wm831x_ldo_exit(void)
 669 {
 670         platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
 671 }
 672 module_exit(wm831x_ldo_exit);
 673
 674 /* Module information */
 675 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 676 MODULE_DESCRIPTION("WM831x LDO driver");
 677 MODULE_LICENSE("GPL");
 678 MODULE_ALIAS("platform:wm831x-ldo");
 679 MODULE_ALIAS("platform:wm831x-aldo");
 680 MODULE_ALIAS("platform:wm831x-aliveldo");