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