drivers/regulator/wm831x-ldo.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 //
   3 // wm831x-ldo.c  --  LDO driver for the WM831x series
   4 //
   5 // Copyright 2009 Wolfson Microelectronics PLC.
   6 //
   7 // Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
   8
   9 #include <linux/module.h>
  10 #include <linux/moduleparam.h>
  11 #include <linux/init.h>
  12 #include <linux/bitops.h>
  13 #include <linux/err.h>
  14 #include <linux/i2c.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/regulator/driver.h>
  17 #include <linux/slab.h>
  18
  19 #include <linux/mfd/wm831x/core.h>
  20 #include <linux/mfd/wm831x/regulator.h>
  21 #include <linux/mfd/wm831x/pdata.h>
  22
  23 #define WM831X_LDO_MAX_NAME 9
  24
  25 #define WM831X_LDO_CONTROL       0
  26 #define WM831X_LDO_ON_CONTROL    1
  27 #define WM831X_LDO_SLEEP_CONTROL 2
  28
  29 #define WM831X_ALIVE_LDO_ON_CONTROL    0
  30 #define WM831X_ALIVE_LDO_SLEEP_CONTROL 1
  31
  32 struct wm831x_ldo {
  33         char name[WM831X_LDO_MAX_NAME];
  34         char supply_name[WM831X_LDO_MAX_NAME];
  35         struct regulator_desc desc;
  36         int base;
  37         struct wm831x *wm831x;
  38         struct regulator_dev *regulator;
  39 };
  40
  41 /*
  42  * Shared
  43  */
  44
  45 static irqreturn_t wm831x_ldo_uv_irq(int irq, void *data)
  46 {
  47         struct wm831x_ldo *ldo = data;
  48
  49         regulator_notifier_call_chain(ldo->regulator,
  50                                       REGULATOR_EVENT_UNDER_VOLTAGE,
  51                                       NULL);
  52
  53         return IRQ_HANDLED;
  54 }
  55
  56 /*
  57  * General purpose LDOs
  58  */
  59
  60 static const struct linear_range wm831x_gp_ldo_ranges[] = {
  61         REGULATOR_LINEAR_RANGE(900000, 0, 14, 50000),
  62         REGULATOR_LINEAR_RANGE(1700000, 15, 31, 100000),
  63 };
  64
  65 static int wm831x_gp_ldo_set_suspend_voltage(struct regulator_dev *rdev,
  66                                              int uV)
  67 {
  68         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
  69         struct wm831x *wm831x = ldo->wm831x;
  70         int sel, reg = ldo->base + WM831X_LDO_SLEEP_CONTROL;
  71
  72         sel = regulator_map_voltage_linear_range(rdev, uV, uV);
  73         if (sel < 0)
  74                 return sel;
  75
  76         return wm831x_set_bits(wm831x, reg, WM831X_LDO1_ON_VSEL_MASK, sel);
  77 }
  78
  79 static unsigned int wm831x_gp_ldo_get_mode(struct regulator_dev *rdev)
  80 {
  81         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
  82         struct wm831x *wm831x = ldo->wm831x;
  83         int ctrl_reg = ldo->base + WM831X_LDO_CONTROL;
  84         int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
  85         int ret;
  86
  87         ret = wm831x_reg_read(wm831x, on_reg);
  88         if (ret < 0)
  89                 return ret;
  90
  91         if (!(ret & WM831X_LDO1_ON_MODE))
  92                 return REGULATOR_MODE_NORMAL;
  93
  94         ret = wm831x_reg_read(wm831x, ctrl_reg);
  95         if (ret < 0)
  96                 return ret;
  97
  98         if (ret & WM831X_LDO1_LP_MODE)
  99                 return REGULATOR_MODE_STANDBY;
 100         else
 101                 return REGULATOR_MODE_IDLE;
 102 }
 103
 104 static int wm831x_gp_ldo_set_mode(struct regulator_dev *rdev,
 105                                   unsigned int mode)
 106 {
 107         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 108         struct wm831x *wm831x = ldo->wm831x;
 109         int ctrl_reg = ldo->base + WM831X_LDO_CONTROL;
 110         int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
 111         int ret;
 112
 113
 114         switch (mode) {
 115         case REGULATOR_MODE_NORMAL:
 116                 ret = wm831x_set_bits(wm831x, on_reg,
 117                                       WM831X_LDO1_ON_MODE, 0);
 118                 if (ret < 0)
 119                         return ret;
 120                 break;
 121
 122         case REGULATOR_MODE_IDLE:
 123                 ret = wm831x_set_bits(wm831x, ctrl_reg,
 124                                       WM831X_LDO1_LP_MODE, 0);
 125                 if (ret < 0)
 126                         return ret;
 127
 128                 ret = wm831x_set_bits(wm831x, on_reg,
 129                                       WM831X_LDO1_ON_MODE,
 130                                       WM831X_LDO1_ON_MODE);
 131                 if (ret < 0)
 132                         return ret;
 133                 break;
 134
 135         case REGULATOR_MODE_STANDBY:
 136                 ret = wm831x_set_bits(wm831x, ctrl_reg,
 137                                       WM831X_LDO1_LP_MODE,
 138                                       WM831X_LDO1_LP_MODE);
 139                 if (ret < 0)
 140                         return ret;
 141
 142                 ret = wm831x_set_bits(wm831x, on_reg,
 143                                       WM831X_LDO1_ON_MODE,
 144                                       WM831X_LDO1_ON_MODE);
 145                 if (ret < 0)
 146                         return ret;
 147                 break;
 148
 149         default:
 150                 return -EINVAL;
 151         }
 152
 153         return 0;
 154 }
 155
 156 static int wm831x_gp_ldo_get_status(struct regulator_dev *rdev)
 157 {
 158         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 159         struct wm831x *wm831x = ldo->wm831x;
 160         int mask = 1 << rdev_get_id(rdev);
 161         int ret;
 162
 163         /* Is the regulator on? */
 164         ret = wm831x_reg_read(wm831x, WM831X_LDO_STATUS);
 165         if (ret < 0)
 166                 return ret;
 167         if (!(ret & mask))
 168                 return REGULATOR_STATUS_OFF;
 169
 170         /* Is it reporting under voltage? */
 171         ret = wm831x_reg_read(wm831x, WM831X_LDO_UV_STATUS);
 172         if (ret < 0)
 173                 return ret;
 174         if (ret & mask)
 175                 return REGULATOR_STATUS_ERROR;
 176
 177         ret = wm831x_gp_ldo_get_mode(rdev);
 178         if (ret < 0)
 179                 return ret;
 180         else
 181                 return regulator_mode_to_status(ret);
 182 }
 183
 184 static unsigned int wm831x_gp_ldo_get_optimum_mode(struct regulator_dev *rdev,
 185                                                    int input_uV,
 186                                                    int output_uV, int load_uA)
 187 {
 188         if (load_uA < 20000)
 189                 return REGULATOR_MODE_STANDBY;
 190         if (load_uA < 50000)
 191                 return REGULATOR_MODE_IDLE;
 192         return REGULATOR_MODE_NORMAL;
 193 }
 194
 195
 196 static const struct regulator_ops wm831x_gp_ldo_ops = {
 197         .list_voltage = regulator_list_voltage_linear_range,
 198         .map_voltage = regulator_map_voltage_linear_range,
 199         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 200         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 201         .set_suspend_voltage = wm831x_gp_ldo_set_suspend_voltage,
 202         .get_mode = wm831x_gp_ldo_get_mode,
 203         .set_mode = wm831x_gp_ldo_set_mode,
 204         .get_status = wm831x_gp_ldo_get_status,
 205         .get_optimum_mode = wm831x_gp_ldo_get_optimum_mode,
 206         .get_bypass = regulator_get_bypass_regmap,
 207         .set_bypass = regulator_set_bypass_regmap,
 208
 209         .is_enabled = regulator_is_enabled_regmap,
 210         .enable = regulator_enable_regmap,
 211         .disable = regulator_disable_regmap,
 212 };
 213
 214 static int wm831x_gp_ldo_probe(struct platform_device *pdev)
 215 {
 216         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 217         struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
 218         struct regulator_config config = { };
 219         int id;
 220         struct wm831x_ldo *ldo;
 221         struct resource *res;
 222         int ret, irq;
 223
 224         if (pdata && pdata->wm831x_num)
 225                 id = (pdata->wm831x_num * 10) + 1;
 226         else
 227                 id = 0;
 228         id = pdev->id - id;
 229
 230         dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
 231
 232         ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ldo), GFP_KERNEL);
 233         if (!ldo)
 234                 return -ENOMEM;
 235
 236         ldo->wm831x = wm831x;
 237
 238         res = platform_get_resource(pdev, IORESOURCE_REG, 0);
 239         if (res == NULL) {
 240                 dev_err(&pdev->dev, "No REG resource\n");
 241                 ret = -EINVAL;
 242                 goto err;
 243         }
 244         ldo->base = res->start;
 245
 246         snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1);
 247         ldo->desc.name = ldo->name;
 248
 249         snprintf(ldo->supply_name, sizeof(ldo->supply_name),
 250                  "LDO%dVDD", id + 1);
 251         ldo->desc.supply_name = ldo->supply_name;
 252
 253         ldo->desc.id = id;
 254         ldo->desc.type = REGULATOR_VOLTAGE;
 255         ldo->desc.n_voltages = 32;
 256         ldo->desc.ops = &wm831x_gp_ldo_ops;
 257         ldo->desc.owner = THIS_MODULE;
 258         ldo->desc.vsel_reg = ldo->base + WM831X_LDO_ON_CONTROL;
 259         ldo->desc.vsel_mask = WM831X_LDO1_ON_VSEL_MASK;
 260         ldo->desc.enable_reg = WM831X_LDO_ENABLE;
 261         ldo->desc.enable_mask = 1 << id;
 262         ldo->desc.bypass_reg = ldo->base;
 263         ldo->desc.bypass_mask = WM831X_LDO1_SWI;
 264         ldo->desc.linear_ranges = wm831x_gp_ldo_ranges;
 265         ldo->desc.n_linear_ranges = ARRAY_SIZE(wm831x_gp_ldo_ranges);
 266
 267         config.dev = pdev->dev.parent;
 268         if (pdata)
 269                 config.init_data = pdata->ldo[id];
 270         config.driver_data = ldo;
 271         config.regmap = wm831x->regmap;
 272
 273         ldo->regulator = devm_regulator_register(&pdev->dev, &ldo->desc,
 274                                                  &config);
 275         if (IS_ERR(ldo->regulator)) {
 276                 ret = PTR_ERR(ldo->regulator);
 277                 dev_err(wm831x->dev, "Failed to register LDO%d: %d\n",
 278                         id + 1, ret);
 279                 goto err;
 280         }
 281
 282         irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
 283         ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
 284                                         wm831x_ldo_uv_irq,
 285                                         IRQF_TRIGGER_RISING | IRQF_ONESHOT,
 286                                         ldo->name,
 287                                         ldo);
 288         if (ret != 0) {
 289                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
 290                         irq, ret);
 291                 goto err;
 292         }
 293
 294         platform_set_drvdata(pdev, ldo);
 295
 296         return 0;
 297
 298 err:
 299         return ret;
 300 }
 301
 302 static struct platform_driver wm831x_gp_ldo_driver = {
 303         .probe = wm831x_gp_ldo_probe,
 304         .driver         = {
 305                 .name   = "wm831x-ldo",
 306         },
 307 };
 308
 309 /*
 310  * Analogue LDOs
 311  */
 312
 313 static const struct linear_range wm831x_aldo_ranges[] = {
 314         REGULATOR_LINEAR_RANGE(1000000, 0, 12, 50000),
 315         REGULATOR_LINEAR_RANGE(1700000, 13, 31, 100000),
 316 };
 317
 318 static int wm831x_aldo_set_suspend_voltage(struct regulator_dev *rdev,
 319                                              int uV)
 320 {
 321         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 322         struct wm831x *wm831x = ldo->wm831x;
 323         int sel, reg = ldo->base + WM831X_LDO_SLEEP_CONTROL;
 324
 325         sel = regulator_map_voltage_linear_range(rdev, uV, uV);
 326         if (sel < 0)
 327                 return sel;
 328
 329         return wm831x_set_bits(wm831x, reg, WM831X_LDO7_ON_VSEL_MASK, sel);
 330 }
 331
 332 static unsigned int wm831x_aldo_get_mode(struct regulator_dev *rdev)
 333 {
 334         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 335         struct wm831x *wm831x = ldo->wm831x;
 336         int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
 337         int ret;
 338
 339         ret = wm831x_reg_read(wm831x, on_reg);
 340         if (ret < 0)
 341                 return 0;
 342
 343         if (ret & WM831X_LDO7_ON_MODE)
 344                 return REGULATOR_MODE_IDLE;
 345         else
 346                 return REGULATOR_MODE_NORMAL;
 347 }
 348
 349 static int wm831x_aldo_set_mode(struct regulator_dev *rdev,
 350                                   unsigned int mode)
 351 {
 352         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 353         struct wm831x *wm831x = ldo->wm831x;
 354         int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
 355         int ret;
 356
 357
 358         switch (mode) {
 359         case REGULATOR_MODE_NORMAL:
 360                 ret = wm831x_set_bits(wm831x, on_reg, WM831X_LDO7_ON_MODE, 0);
 361                 if (ret < 0)
 362                         return ret;
 363                 break;
 364
 365         case REGULATOR_MODE_IDLE:
 366                 ret = wm831x_set_bits(wm831x, on_reg, WM831X_LDO7_ON_MODE,
 367                                       WM831X_LDO7_ON_MODE);
 368                 if (ret < 0)
 369                         return ret;
 370                 break;
 371
 372         default:
 373                 return -EINVAL;
 374         }
 375
 376         return 0;
 377 }
 378
 379 static int wm831x_aldo_get_status(struct regulator_dev *rdev)
 380 {
 381         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 382         struct wm831x *wm831x = ldo->wm831x;
 383         int mask = 1 << rdev_get_id(rdev);
 384         int ret;
 385
 386         /* Is the regulator on? */
 387         ret = wm831x_reg_read(wm831x, WM831X_LDO_STATUS);
 388         if (ret < 0)
 389                 return ret;
 390         if (!(ret & mask))
 391                 return REGULATOR_STATUS_OFF;
 392
 393         /* Is it reporting under voltage? */
 394         ret = wm831x_reg_read(wm831x, WM831X_LDO_UV_STATUS);
 395         if (ret < 0)
 396                 return ret;
 397         if (ret & mask)
 398                 return REGULATOR_STATUS_ERROR;
 399
 400         ret = wm831x_aldo_get_mode(rdev);
 401         if (ret < 0)
 402                 return ret;
 403         else
 404                 return regulator_mode_to_status(ret);
 405 }
 406
 407 static const struct regulator_ops wm831x_aldo_ops = {
 408         .list_voltage = regulator_list_voltage_linear_range,
 409         .map_voltage = regulator_map_voltage_linear_range,
 410         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 411         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 412         .set_suspend_voltage = wm831x_aldo_set_suspend_voltage,
 413         .get_mode = wm831x_aldo_get_mode,
 414         .set_mode = wm831x_aldo_set_mode,
 415         .get_status = wm831x_aldo_get_status,
 416         .set_bypass = regulator_set_bypass_regmap,
 417         .get_bypass = regulator_get_bypass_regmap,
 418
 419         .is_enabled = regulator_is_enabled_regmap,
 420         .enable = regulator_enable_regmap,
 421         .disable = regulator_disable_regmap,
 422 };
 423
 424 static int wm831x_aldo_probe(struct platform_device *pdev)
 425 {
 426         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 427         struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
 428         struct regulator_config config = { };
 429         int id;
 430         struct wm831x_ldo *ldo;
 431         struct resource *res;
 432         int ret, irq;
 433
 434         if (pdata && pdata->wm831x_num)
 435                 id = (pdata->wm831x_num * 10) + 1;
 436         else
 437                 id = 0;
 438         id = pdev->id - id;
 439
 440         dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
 441
 442         ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ldo), GFP_KERNEL);
 443         if (!ldo)
 444                 return -ENOMEM;
 445
 446         ldo->wm831x = wm831x;
 447
 448         res = platform_get_resource(pdev, IORESOURCE_REG, 0);
 449         if (res == NULL) {
 450                 dev_err(&pdev->dev, "No REG resource\n");
 451                 ret = -EINVAL;
 452                 goto err;
 453         }
 454         ldo->base = res->start;
 455
 456         snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1);
 457         ldo->desc.name = ldo->name;
 458
 459         snprintf(ldo->supply_name, sizeof(ldo->supply_name),
 460                  "LDO%dVDD", id + 1);
 461         ldo->desc.supply_name = ldo->supply_name;
 462
 463         ldo->desc.id = id;
 464         ldo->desc.type = REGULATOR_VOLTAGE;
 465         ldo->desc.n_voltages = 32;
 466         ldo->desc.linear_ranges = wm831x_aldo_ranges;
 467         ldo->desc.n_linear_ranges = ARRAY_SIZE(wm831x_aldo_ranges);
 468         ldo->desc.ops = &wm831x_aldo_ops;
 469         ldo->desc.owner = THIS_MODULE;
 470         ldo->desc.vsel_reg = ldo->base + WM831X_LDO_ON_CONTROL;
 471         ldo->desc.vsel_mask = WM831X_LDO7_ON_VSEL_MASK;
 472         ldo->desc.enable_reg = WM831X_LDO_ENABLE;
 473         ldo->desc.enable_mask = 1 << id;
 474         ldo->desc.bypass_reg = ldo->base;
 475         ldo->desc.bypass_mask = WM831X_LDO7_SWI;
 476
 477         config.dev = pdev->dev.parent;
 478         if (pdata)
 479                 config.init_data = pdata->ldo[id];
 480         config.driver_data = ldo;
 481         config.regmap = wm831x->regmap;
 482
 483         ldo->regulator = devm_regulator_register(&pdev->dev, &ldo->desc,
 484                                                  &config);
 485         if (IS_ERR(ldo->regulator)) {
 486                 ret = PTR_ERR(ldo->regulator);
 487                 dev_err(wm831x->dev, "Failed to register LDO%d: %d\n",
 488                         id + 1, ret);
 489                 goto err;
 490         }
 491
 492         irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
 493         ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
 494                                         wm831x_ldo_uv_irq,
 495                                         IRQF_TRIGGER_RISING | IRQF_ONESHOT,
 496                                         ldo->name, ldo);
 497         if (ret != 0) {
 498                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
 499                         irq, ret);
 500                 goto err;
 501         }
 502
 503         platform_set_drvdata(pdev, ldo);
 504
 505         return 0;
 506
 507 err:
 508         return ret;
 509 }
 510
 511 static struct platform_driver wm831x_aldo_driver = {
 512         .probe = wm831x_aldo_probe,
 513         .driver         = {
 514                 .name   = "wm831x-aldo",
 515         },
 516 };
 517
 518 /*
 519  * Alive LDO
 520  */
 521
 522 #define WM831X_ALIVE_LDO_MAX_SELECTOR 0xf
 523
 524 static int wm831x_alive_ldo_set_suspend_voltage(struct regulator_dev *rdev,
 525                                              int uV)
 526 {
 527         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 528         struct wm831x *wm831x = ldo->wm831x;
 529         int sel, reg = ldo->base + WM831X_ALIVE_LDO_SLEEP_CONTROL;
 530
 531         sel = regulator_map_voltage_linear(rdev, uV, uV);
 532         if (sel < 0)
 533                 return sel;
 534
 535         return wm831x_set_bits(wm831x, reg, WM831X_LDO11_ON_VSEL_MASK, sel);
 536 }
 537
 538 static int wm831x_alive_ldo_get_status(struct regulator_dev *rdev)
 539 {
 540         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 541         struct wm831x *wm831x = ldo->wm831x;
 542         int mask = 1 << rdev_get_id(rdev);
 543         int ret;
 544
 545         /* Is the regulator on? */
 546         ret = wm831x_reg_read(wm831x, WM831X_LDO_STATUS);
 547         if (ret < 0)
 548                 return ret;
 549         if (ret & mask)
 550                 return REGULATOR_STATUS_ON;
 551         else
 552                 return REGULATOR_STATUS_OFF;
 553 }
 554
 555 static const struct regulator_ops wm831x_alive_ldo_ops = {
 556         .list_voltage = regulator_list_voltage_linear,
 557         .map_voltage = regulator_map_voltage_linear,
 558         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 559         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 560         .set_suspend_voltage = wm831x_alive_ldo_set_suspend_voltage,
 561         .get_status = wm831x_alive_ldo_get_status,
 562
 563         .is_enabled = regulator_is_enabled_regmap,
 564         .enable = regulator_enable_regmap,
 565         .disable = regulator_disable_regmap,
 566 };
 567
 568 static int wm831x_alive_ldo_probe(struct platform_device *pdev)
 569 {
 570         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 571         struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
 572         struct regulator_config config = { };
 573         int id;
 574         struct wm831x_ldo *ldo;
 575         struct resource *res;
 576         int ret;
 577
 578         if (pdata && pdata->wm831x_num)
 579                 id = (pdata->wm831x_num * 10) + 1;
 580         else
 581                 id = 0;
 582         id = pdev->id - id;
 583
 584
 585         dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
 586
 587         ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ldo), GFP_KERNEL);
 588         if (!ldo)
 589                 return -ENOMEM;
 590
 591         ldo->wm831x = wm831x;
 592
 593         res = platform_get_resource(pdev, IORESOURCE_REG, 0);
 594         if (res == NULL) {
 595                 dev_err(&pdev->dev, "No REG resource\n");
 596                 ret = -EINVAL;
 597                 goto err;
 598         }
 599         ldo->base = res->start;
 600
 601         snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1);
 602         ldo->desc.name = ldo->name;
 603
 604         snprintf(ldo->supply_name, sizeof(ldo->supply_name),
 605                  "LDO%dVDD", id + 1);
 606         ldo->desc.supply_name = ldo->supply_name;
 607
 608         ldo->desc.id = id;
 609         ldo->desc.type = REGULATOR_VOLTAGE;
 610         ldo->desc.n_voltages = WM831X_ALIVE_LDO_MAX_SELECTOR + 1;
 611         ldo->desc.ops = &wm831x_alive_ldo_ops;
 612         ldo->desc.owner = THIS_MODULE;
 613         ldo->desc.vsel_reg = ldo->base + WM831X_ALIVE_LDO_ON_CONTROL;
 614         ldo->desc.vsel_mask = WM831X_LDO11_ON_VSEL_MASK;
 615         ldo->desc.enable_reg = WM831X_LDO_ENABLE;
 616         ldo->desc.enable_mask = 1 << id;
 617         ldo->desc.min_uV = 800000;
 618         ldo->desc.uV_step = 50000;
 619         ldo->desc.enable_time = 1000;
 620
 621         config.dev = pdev->dev.parent;
 622         if (pdata)
 623                 config.init_data = pdata->ldo[id];
 624         config.driver_data = ldo;
 625         config.regmap = wm831x->regmap;
 626
 627         ldo->regulator = devm_regulator_register(&pdev->dev, &ldo->desc,
 628                                                  &config);
 629         if (IS_ERR(ldo->regulator)) {
 630                 ret = PTR_ERR(ldo->regulator);
 631                 dev_err(wm831x->dev, "Failed to register LDO%d: %d\n",
 632                         id + 1, ret);
 633                 goto err;
 634         }
 635
 636         platform_set_drvdata(pdev, ldo);
 637
 638         return 0;
 639
 640 err:
 641         return ret;
 642 }
 643
 644 static struct platform_driver wm831x_alive_ldo_driver = {
 645         .probe = wm831x_alive_ldo_probe,
 646         .driver         = {
 647                 .name   = "wm831x-alive-ldo",
 648         },
 649 };
 650
 651 static struct platform_driver * const drivers[] = {
 652         &wm831x_gp_ldo_driver,
 653         &wm831x_aldo_driver,
 654         &wm831x_alive_ldo_driver,
 655 };
 656
 657 static int __init wm831x_ldo_init(void)
 658 {
 659         return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
 660 }
 661 subsys_initcall(wm831x_ldo_init);
 662
 663 static void __exit wm831x_ldo_exit(void)
 664 {
 665         platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
 666 }
 667 module_exit(wm831x_ldo_exit);
 668
 669 /* Module information */
 670 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 671 MODULE_DESCRIPTION("WM831x LDO driver");
 672 MODULE_LICENSE("GPL");
 673 MODULE_ALIAS("platform:wm831x-ldo");
 674 MODULE_ALIAS("platform:wm831x-aldo");
 675 MODULE_ALIAS("platform:wm831x-aliveldo");