kernel/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 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, ldo->name,
 291                                         ldo);
 292         if (ret != 0) {
 293                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
 294                         irq, ret);
 295                 goto err;
 296         }
 297
 298         platform_set_drvdata(pdev, ldo);
 299
 300         return 0;
 301
 302 err:
 303         return ret;
 304 }
 305
 306 static struct platform_driver wm831x_gp_ldo_driver = {
 307         .probe = wm831x_gp_ldo_probe,
 308         .driver         = {
 309                 .name   = "wm831x-ldo",
 310         },
 311 };
 312
 313 /*
 314  * Analogue LDOs
 315  */
 316
 317 static const struct regulator_linear_range wm831x_aldo_ranges[] = {
 318         REGULATOR_LINEAR_RANGE(1000000, 0, 12, 50000),
 319         REGULATOR_LINEAR_RANGE(1700000, 13, 31, 100000),
 320 };
 321
 322 static int wm831x_aldo_set_suspend_voltage(struct regulator_dev *rdev,
 323                                              int uV)
 324 {
 325         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 326         struct wm831x *wm831x = ldo->wm831x;
 327         int sel, reg = ldo->base + WM831X_LDO_SLEEP_CONTROL;
 328
 329         sel = regulator_map_voltage_linear_range(rdev, uV, uV);
 330         if (sel < 0)
 331                 return sel;
 332
 333         return wm831x_set_bits(wm831x, reg, WM831X_LDO7_ON_VSEL_MASK, sel);
 334 }
 335
 336 static unsigned int wm831x_aldo_get_mode(struct regulator_dev *rdev)
 337 {
 338         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 339         struct wm831x *wm831x = ldo->wm831x;
 340         int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
 341         int ret;
 342
 343         ret = wm831x_reg_read(wm831x, on_reg);
 344         if (ret < 0)
 345                 return 0;
 346
 347         if (ret & WM831X_LDO7_ON_MODE)
 348                 return REGULATOR_MODE_IDLE;
 349         else
 350                 return REGULATOR_MODE_NORMAL;
 351 }
 352
 353 static int wm831x_aldo_set_mode(struct regulator_dev *rdev,
 354                                   unsigned int mode)
 355 {
 356         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 357         struct wm831x *wm831x = ldo->wm831x;
 358         int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
 359         int ret;
 360
 361
 362         switch (mode) {
 363         case REGULATOR_MODE_NORMAL:
 364                 ret = wm831x_set_bits(wm831x, on_reg, WM831X_LDO7_ON_MODE, 0);
 365                 if (ret < 0)
 366                         return ret;
 367                 break;
 368
 369         case REGULATOR_MODE_IDLE:
 370                 ret = wm831x_set_bits(wm831x, on_reg, WM831X_LDO7_ON_MODE,
 371                                       WM831X_LDO7_ON_MODE);
 372                 if (ret < 0)
 373                         return ret;
 374                 break;
 375
 376         default:
 377                 return -EINVAL;
 378         }
 379
 380         return 0;
 381 }
 382
 383 static int wm831x_aldo_get_status(struct regulator_dev *rdev)
 384 {
 385         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 386         struct wm831x *wm831x = ldo->wm831x;
 387         int mask = 1 << rdev_get_id(rdev);
 388         int ret;
 389
 390         /* Is the regulator on? */
 391         ret = wm831x_reg_read(wm831x, WM831X_LDO_STATUS);
 392         if (ret < 0)
 393                 return ret;
 394         if (!(ret & mask))
 395                 return REGULATOR_STATUS_OFF;
 396
 397         /* Is it reporting under voltage? */
 398         ret = wm831x_reg_read(wm831x, WM831X_LDO_UV_STATUS);
 399         if (ret < 0)
 400                 return ret;
 401         if (ret & mask)
 402                 return REGULATOR_STATUS_ERROR;
 403
 404         ret = wm831x_aldo_get_mode(rdev);
 405         if (ret < 0)
 406                 return ret;
 407         else
 408                 return regulator_mode_to_status(ret);
 409 }
 410
 411 static struct regulator_ops wm831x_aldo_ops = {
 412         .list_voltage = regulator_list_voltage_linear_range,
 413         .map_voltage = regulator_map_voltage_linear_range,
 414         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 415         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 416         .set_suspend_voltage = wm831x_aldo_set_suspend_voltage,
 417         .get_mode = wm831x_aldo_get_mode,
 418         .set_mode = wm831x_aldo_set_mode,
 419         .get_status = wm831x_aldo_get_status,
 420         .set_bypass = regulator_set_bypass_regmap,
 421         .get_bypass = regulator_get_bypass_regmap,
 422
 423         .is_enabled = regulator_is_enabled_regmap,
 424         .enable = regulator_enable_regmap,
 425         .disable = regulator_disable_regmap,
 426 };
 427
 428 static int wm831x_aldo_probe(struct platform_device *pdev)
 429 {
 430         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 431         struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
 432         struct regulator_config config = { };
 433         int id;
 434         struct wm831x_ldo *ldo;
 435         struct resource *res;
 436         int ret, irq;
 437
 438         if (pdata && pdata->wm831x_num)
 439                 id = (pdata->wm831x_num * 10) + 1;
 440         else
 441                 id = 0;
 442         id = pdev->id - id;
 443
 444         dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
 445
 446         ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ldo), GFP_KERNEL);
 447         if (!ldo)
 448                 return -ENOMEM;
 449
 450         ldo->wm831x = wm831x;
 451
 452         res = platform_get_resource(pdev, IORESOURCE_REG, 0);
 453         if (res == NULL) {
 454                 dev_err(&pdev->dev, "No REG resource\n");
 455                 ret = -EINVAL;
 456                 goto err;
 457         }
 458         ldo->base = res->start;
 459
 460         snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1);
 461         ldo->desc.name = ldo->name;
 462
 463         snprintf(ldo->supply_name, sizeof(ldo->supply_name),
 464                  "LDO%dVDD", id + 1);
 465         ldo->desc.supply_name = ldo->supply_name;
 466
 467         ldo->desc.id = id;
 468         ldo->desc.type = REGULATOR_VOLTAGE;
 469         ldo->desc.n_voltages = 32;
 470         ldo->desc.linear_ranges = wm831x_aldo_ranges;
 471         ldo->desc.n_linear_ranges = ARRAY_SIZE(wm831x_aldo_ranges);
 472         ldo->desc.ops = &wm831x_aldo_ops;
 473         ldo->desc.owner = THIS_MODULE;
 474         ldo->desc.vsel_reg = ldo->base + WM831X_LDO_ON_CONTROL;
 475         ldo->desc.vsel_mask = WM831X_LDO7_ON_VSEL_MASK;
 476         ldo->desc.enable_reg = WM831X_LDO_ENABLE;
 477         ldo->desc.enable_mask = 1 << id;
 478         ldo->desc.bypass_reg = ldo->base;
 479         ldo->desc.bypass_mask = WM831X_LDO7_SWI;
 480
 481         config.dev = pdev->dev.parent;
 482         if (pdata)
 483                 config.init_data = pdata->ldo[id];
 484         config.driver_data = ldo;
 485         config.regmap = wm831x->regmap;
 486
 487         ldo->regulator = devm_regulator_register(&pdev->dev, &ldo->desc,
 488                                                  &config);
 489         if (IS_ERR(ldo->regulator)) {
 490                 ret = PTR_ERR(ldo->regulator);
 491                 dev_err(wm831x->dev, "Failed to register LDO%d: %d\n",
 492                         id + 1, ret);
 493                 goto err;
 494         }
 495
 496         irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
 497         ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
 498                                         wm831x_ldo_uv_irq,
 499                                         IRQF_TRIGGER_RISING, ldo->name, ldo);
 500         if (ret != 0) {
 501                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
 502                         irq, ret);
 503                 goto err;
 504         }
 505
 506         platform_set_drvdata(pdev, ldo);
 507
 508         return 0;
 509
 510 err:
 511         return ret;
 512 }
 513
 514 static struct platform_driver wm831x_aldo_driver = {
 515         .probe = wm831x_aldo_probe,
 516         .driver         = {
 517                 .name   = "wm831x-aldo",
 518         },
 519 };
 520
 521 /*
 522  * Alive LDO
 523  */
 524
 525 #define WM831X_ALIVE_LDO_MAX_SELECTOR 0xf
 526
 527 static int wm831x_alive_ldo_set_suspend_voltage(struct regulator_dev *rdev,
 528                                              int uV)
 529 {
 530         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 531         struct wm831x *wm831x = ldo->wm831x;
 532         int sel, reg = ldo->base + WM831X_ALIVE_LDO_SLEEP_CONTROL;
 533
 534         sel = regulator_map_voltage_linear(rdev, uV, uV);
 535         if (sel < 0)
 536                 return sel;
 537
 538         return wm831x_set_bits(wm831x, reg, WM831X_LDO11_ON_VSEL_MASK, sel);
 539 }
 540
 541 static int wm831x_alive_ldo_get_status(struct regulator_dev *rdev)
 542 {
 543         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 544         struct wm831x *wm831x = ldo->wm831x;
 545         int mask = 1 << rdev_get_id(rdev);
 546         int ret;
 547
 548         /* Is the regulator on? */
 549         ret = wm831x_reg_read(wm831x, WM831X_LDO_STATUS);
 550         if (ret < 0)
 551                 return ret;
 552         if (ret & mask)
 553                 return REGULATOR_STATUS_ON;
 554         else
 555                 return REGULATOR_STATUS_OFF;
 556 }
 557
 558 static struct regulator_ops wm831x_alive_ldo_ops = {
 559         .list_voltage = regulator_list_voltage_linear,
 560         .map_voltage = regulator_map_voltage_linear,
 561         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 562         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 563         .set_suspend_voltage = wm831x_alive_ldo_set_suspend_voltage,
 564         .get_status = wm831x_alive_ldo_get_status,
 565
 566         .is_enabled = regulator_is_enabled_regmap,
 567         .enable = regulator_enable_regmap,
 568         .disable = regulator_disable_regmap,
 569 };
 570
 571 static int wm831x_alive_ldo_probe(struct platform_device *pdev)
 572 {
 573         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 574         struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
 575         struct regulator_config config = { };
 576         int id;
 577         struct wm831x_ldo *ldo;
 578         struct resource *res;
 579         int ret;
 580
 581         if (pdata && pdata->wm831x_num)
 582                 id = (pdata->wm831x_num * 10) + 1;
 583         else
 584                 id = 0;
 585         id = pdev->id - id;
 586
 587
 588         dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
 589
 590         ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ldo), GFP_KERNEL);
 591         if (!ldo)
 592                 return -ENOMEM;
 593
 594         ldo->wm831x = wm831x;
 595
 596         res = platform_get_resource(pdev, IORESOURCE_REG, 0);
 597         if (res == NULL) {
 598                 dev_err(&pdev->dev, "No REG resource\n");
 599                 ret = -EINVAL;
 600                 goto err;
 601         }
 602         ldo->base = res->start;
 603
 604         snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1);
 605         ldo->desc.name = ldo->name;
 606
 607         snprintf(ldo->supply_name, sizeof(ldo->supply_name),
 608                  "LDO%dVDD", id + 1);
 609         ldo->desc.supply_name = ldo->supply_name;
 610
 611         ldo->desc.id = id;
 612         ldo->desc.type = REGULATOR_VOLTAGE;
 613         ldo->desc.n_voltages = WM831X_ALIVE_LDO_MAX_SELECTOR + 1;
 614         ldo->desc.ops = &wm831x_alive_ldo_ops;
 615         ldo->desc.owner = THIS_MODULE;
 616         ldo->desc.vsel_reg = ldo->base + WM831X_ALIVE_LDO_ON_CONTROL;
 617         ldo->desc.vsel_mask = WM831X_LDO11_ON_VSEL_MASK;
 618         ldo->desc.enable_reg = WM831X_LDO_ENABLE;
 619         ldo->desc.enable_mask = 1 << id;
 620         ldo->desc.min_uV = 800000;
 621         ldo->desc.uV_step = 50000;
 622         ldo->desc.enable_time = 1000;
 623
 624         config.dev = pdev->dev.parent;
 625         if (pdata)
 626                 config.init_data = pdata->ldo[id];
 627         config.driver_data = ldo;
 628         config.regmap = wm831x->regmap;
 629
 630         ldo->regulator = devm_regulator_register(&pdev->dev, &ldo->desc,
 631                                                  &config);
 632         if (IS_ERR(ldo->regulator)) {
 633                 ret = PTR_ERR(ldo->regulator);
 634                 dev_err(wm831x->dev, "Failed to register LDO%d: %d\n",
 635                         id + 1, ret);
 636                 goto err;
 637         }
 638
 639         platform_set_drvdata(pdev, ldo);
 640
 641         return 0;
 642
 643 err:
 644         return ret;
 645 }
 646
 647 static struct platform_driver wm831x_alive_ldo_driver = {
 648         .probe = wm831x_alive_ldo_probe,
 649         .driver         = {
 650                 .name   = "wm831x-alive-ldo",
 651         },
 652 };
 653
 654 static int __init wm831x_ldo_init(void)
 655 {
 656         int ret;
 657
 658         ret = platform_driver_register(&wm831x_gp_ldo_driver);
 659         if (ret != 0)
 660                 pr_err("Failed to register WM831x GP LDO driver: %d\n", ret);
 661
 662         ret = platform_driver_register(&wm831x_aldo_driver);
 663         if (ret != 0)
 664                 pr_err("Failed to register WM831x ALDO driver: %d\n", ret);
 665
 666         ret = platform_driver_register(&wm831x_alive_ldo_driver);
 667         if (ret != 0)
 668                 pr_err("Failed to register WM831x alive LDO driver: %d\n",
 669                        ret);
 670
 671         return 0;
 672 }
 673 subsys_initcall(wm831x_ldo_init);
 674
 675 static void __exit wm831x_ldo_exit(void)
 676 {
 677         platform_driver_unregister(&wm831x_alive_ldo_driver);
 678         platform_driver_unregister(&wm831x_aldo_driver);
 679         platform_driver_unregister(&wm831x_gp_ldo_driver);
 680 }
 681 module_exit(wm831x_ldo_exit);
 682
 683 /* Module information */
 684 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 685 MODULE_DESCRIPTION("WM831x LDO driver");
 686 MODULE_LICENSE("GPL");
 687 MODULE_ALIAS("platform:wm831x-ldo");
 688 MODULE_ALIAS("platform:wm831x-aldo");
 689 MODULE_ALIAS("platform:wm831x-aliveldo");