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 6
  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         struct regulator_desc desc;
  40         int base;
  41         struct wm831x *wm831x;
  42         struct regulator_dev *regulator;
  43 };
  44
  45 /*
  46  * Shared
  47  */
  48
  49 static int wm831x_ldo_is_enabled(struct regulator_dev *rdev)
  50 {
  51         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
  52         struct wm831x *wm831x = ldo->wm831x;
  53         int mask = 1 << rdev_get_id(rdev);
  54         int reg;
  55
  56         reg = wm831x_reg_read(wm831x, WM831X_LDO_ENABLE);
  57         if (reg < 0)
  58                 return reg;
  59
  60         if (reg & mask)
  61                 return 1;
  62         else
  63                 return 0;
  64 }
  65
  66 static int wm831x_ldo_enable(struct regulator_dev *rdev)
  67 {
  68         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
  69         struct wm831x *wm831x = ldo->wm831x;
  70         int mask = 1 << rdev_get_id(rdev);
  71
  72         return wm831x_set_bits(wm831x, WM831X_LDO_ENABLE, mask, mask);
  73 }
  74
  75 static int wm831x_ldo_disable(struct regulator_dev *rdev)
  76 {
  77         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
  78         struct wm831x *wm831x = ldo->wm831x;
  79         int mask = 1 << rdev_get_id(rdev);
  80
  81         return wm831x_set_bits(wm831x, WM831X_LDO_ENABLE, mask, 0);
  82 }
  83
  84 static irqreturn_t wm831x_ldo_uv_irq(int irq, void *data)
  85 {
  86         struct wm831x_ldo *ldo = data;
  87
  88         regulator_notifier_call_chain(ldo->regulator,
  89                                       REGULATOR_EVENT_UNDER_VOLTAGE,
  90                                       NULL);
  91
  92         return IRQ_HANDLED;
  93 }
  94
  95 /*
  96  * General purpose LDOs
  97  */
  98
  99 #define WM831X_GP_LDO_SELECTOR_LOW 0xe
 100 #define WM831X_GP_LDO_MAX_SELECTOR 0x1f
 101
 102 static int wm831x_gp_ldo_list_voltage(struct regulator_dev *rdev,
 103                                       unsigned int selector)
 104 {
 105         /* 0.9-1.6V in 50mV steps */
 106         if (selector <= WM831X_GP_LDO_SELECTOR_LOW)
 107                 return 900000 + (selector * 50000);
 108         /* 1.7-3.3V in 50mV steps */
 109         if (selector <= WM831X_GP_LDO_MAX_SELECTOR)
 110                 return 1600000 + ((selector - WM831X_GP_LDO_SELECTOR_LOW)
 111                                   * 100000);
 112         return -EINVAL;
 113 }
 114
 115 static int wm831x_gp_ldo_set_voltage_int(struct regulator_dev *rdev, int reg,
 116                                          int min_uV, int max_uV,
 117                                          unsigned *selector)
 118 {
 119         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 120         struct wm831x *wm831x = ldo->wm831x;
 121         int vsel, ret;
 122
 123         if (min_uV < 900000)
 124                 vsel = 0;
 125         else if (min_uV < 1700000)
 126                 vsel = ((min_uV - 900000) / 50000);
 127         else
 128                 vsel = ((min_uV - 1700000) / 100000)
 129                         + WM831X_GP_LDO_SELECTOR_LOW + 1;
 130
 131         ret = wm831x_gp_ldo_list_voltage(rdev, vsel);
 132         if (ret < 0)
 133                 return ret;
 134         if (ret < min_uV || ret > max_uV)
 135                 return -EINVAL;
 136
 137         *selector = vsel;
 138
 139         return wm831x_set_bits(wm831x, reg, WM831X_LDO1_ON_VSEL_MASK, vsel);
 140 }
 141
 142 static int wm831x_gp_ldo_set_voltage(struct regulator_dev *rdev,
 143                                      int min_uV, int max_uV,
 144                                      unsigned *selector)
 145 {
 146         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 147         int reg = ldo->base + WM831X_LDO_ON_CONTROL;
 148
 149         return wm831x_gp_ldo_set_voltage_int(rdev, reg, min_uV, max_uV,
 150                                              selector);
 151 }
 152
 153 static int wm831x_gp_ldo_set_suspend_voltage(struct regulator_dev *rdev,
 154                                              int uV)
 155 {
 156         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 157         int reg = ldo->base + WM831X_LDO_SLEEP_CONTROL;
 158         unsigned int selector;
 159
 160         return wm831x_gp_ldo_set_voltage_int(rdev, reg, uV, uV, &selector);
 161 }
 162
 163 static int wm831x_gp_ldo_get_voltage_sel(struct regulator_dev *rdev)
 164 {
 165         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 166         struct wm831x *wm831x = ldo->wm831x;
 167         int reg = ldo->base + WM831X_LDO_ON_CONTROL;
 168         int ret;
 169
 170         ret = wm831x_reg_read(wm831x, reg);
 171         if (ret < 0)
 172                 return ret;
 173
 174         ret &= WM831X_LDO1_ON_VSEL_MASK;
 175
 176         return ret;
 177 }
 178
 179 static unsigned int wm831x_gp_ldo_get_mode(struct regulator_dev *rdev)
 180 {
 181         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 182         struct wm831x *wm831x = ldo->wm831x;
 183         int ctrl_reg = ldo->base + WM831X_LDO_CONTROL;
 184         int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
 185         int ret;
 186
 187         ret = wm831x_reg_read(wm831x, on_reg);
 188         if (ret < 0)
 189                 return ret;
 190
 191         if (!(ret & WM831X_LDO1_ON_MODE))
 192                 return REGULATOR_MODE_NORMAL;
 193
 194         ret = wm831x_reg_read(wm831x, ctrl_reg);
 195         if (ret < 0)
 196                 return ret;
 197
 198         if (ret & WM831X_LDO1_LP_MODE)
 199                 return REGULATOR_MODE_STANDBY;
 200         else
 201                 return REGULATOR_MODE_IDLE;
 202 }
 203
 204 static int wm831x_gp_ldo_set_mode(struct regulator_dev *rdev,
 205                                   unsigned int mode)
 206 {
 207         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 208         struct wm831x *wm831x = ldo->wm831x;
 209         int ctrl_reg = ldo->base + WM831X_LDO_CONTROL;
 210         int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
 211         int ret;
 212
 213
 214         switch (mode) {
 215         case REGULATOR_MODE_NORMAL:
 216                 ret = wm831x_set_bits(wm831x, on_reg,
 217                                       WM831X_LDO1_ON_MODE, 0);
 218                 if (ret < 0)
 219                         return ret;
 220                 break;
 221
 222         case REGULATOR_MODE_IDLE:
 223                 ret = wm831x_set_bits(wm831x, ctrl_reg,
 224                                       WM831X_LDO1_LP_MODE, 0);
 225                 if (ret < 0)
 226                         return ret;
 227
 228                 ret = wm831x_set_bits(wm831x, on_reg,
 229                                       WM831X_LDO1_ON_MODE,
 230                                       WM831X_LDO1_ON_MODE);
 231                 if (ret < 0)
 232                         return ret;
 233                 break;
 234
 235         case REGULATOR_MODE_STANDBY:
 236                 ret = wm831x_set_bits(wm831x, ctrl_reg,
 237                                       WM831X_LDO1_LP_MODE,
 238                                       WM831X_LDO1_LP_MODE);
 239                 if (ret < 0)
 240                         return ret;
 241
 242                 ret = wm831x_set_bits(wm831x, on_reg,
 243                                       WM831X_LDO1_ON_MODE,
 244                                       WM831X_LDO1_ON_MODE);
 245                 if (ret < 0)
 246                         return ret;
 247                 break;
 248
 249         default:
 250                 return -EINVAL;
 251         }
 252
 253         return 0;
 254 }
 255
 256 static int wm831x_gp_ldo_get_status(struct regulator_dev *rdev)
 257 {
 258         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 259         struct wm831x *wm831x = ldo->wm831x;
 260         int mask = 1 << rdev_get_id(rdev);
 261         int ret;
 262
 263         /* Is the regulator on? */
 264         ret = wm831x_reg_read(wm831x, WM831X_LDO_STATUS);
 265         if (ret < 0)
 266                 return ret;
 267         if (!(ret & mask))
 268                 return REGULATOR_STATUS_OFF;
 269
 270         /* Is it reporting under voltage? */
 271         ret = wm831x_reg_read(wm831x, WM831X_LDO_UV_STATUS);
 272         if (ret & mask)
 273                 return REGULATOR_STATUS_ERROR;
 274
 275         ret = wm831x_gp_ldo_get_mode(rdev);
 276         if (ret < 0)
 277                 return ret;
 278         else
 279                 return regulator_mode_to_status(ret);
 280 }
 281
 282 static unsigned int wm831x_gp_ldo_get_optimum_mode(struct regulator_dev *rdev,
 283                                                    int input_uV,
 284                                                    int output_uV, int load_uA)
 285 {
 286         if (load_uA < 20000)
 287                 return REGULATOR_MODE_STANDBY;
 288         if (load_uA < 50000)
 289                 return REGULATOR_MODE_IDLE;
 290         return REGULATOR_MODE_NORMAL;
 291 }
 292
 293
 294 static struct regulator_ops wm831x_gp_ldo_ops = {
 295         .list_voltage = wm831x_gp_ldo_list_voltage,
 296         .get_voltage_sel = wm831x_gp_ldo_get_voltage_sel,
 297         .set_voltage = wm831x_gp_ldo_set_voltage,
 298         .set_suspend_voltage = wm831x_gp_ldo_set_suspend_voltage,
 299         .get_mode = wm831x_gp_ldo_get_mode,
 300         .set_mode = wm831x_gp_ldo_set_mode,
 301         .get_status = wm831x_gp_ldo_get_status,
 302         .get_optimum_mode = wm831x_gp_ldo_get_optimum_mode,
 303
 304         .is_enabled = wm831x_ldo_is_enabled,
 305         .enable = wm831x_ldo_enable,
 306         .disable = wm831x_ldo_disable,
 307 };
 308
 309 static __devinit int wm831x_gp_ldo_probe(struct platform_device *pdev)
 310 {
 311         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 312         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
 313         int id = pdev->id % ARRAY_SIZE(pdata->ldo);
 314         struct wm831x_ldo *ldo;
 315         struct resource *res;
 316         int ret, irq;
 317
 318         dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
 319
 320         if (pdata == NULL || pdata->ldo[id] == NULL)
 321                 return -ENODEV;
 322
 323         ldo = kzalloc(sizeof(struct wm831x_ldo), GFP_KERNEL);
 324         if (ldo == NULL) {
 325                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 326                 return -ENOMEM;
 327         }
 328
 329         ldo->wm831x = wm831x;
 330
 331         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 332         if (res == NULL) {
 333                 dev_err(&pdev->dev, "No I/O resource\n");
 334                 ret = -EINVAL;
 335                 goto err;
 336         }
 337         ldo->base = res->start;
 338
 339         snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1);
 340         ldo->desc.name = ldo->name;
 341         ldo->desc.id = id;
 342         ldo->desc.type = REGULATOR_VOLTAGE;
 343         ldo->desc.n_voltages = WM831X_GP_LDO_MAX_SELECTOR + 1;
 344         ldo->desc.ops = &wm831x_gp_ldo_ops;
 345         ldo->desc.owner = THIS_MODULE;
 346
 347         ldo->regulator = regulator_register(&ldo->desc, &pdev->dev,
 348                                              pdata->ldo[id], ldo);
 349         if (IS_ERR(ldo->regulator)) {
 350                 ret = PTR_ERR(ldo->regulator);
 351                 dev_err(wm831x->dev, "Failed to register LDO%d: %d\n",
 352                         id + 1, ret);
 353                 goto err;
 354         }
 355
 356         irq = platform_get_irq_byname(pdev, "UV");
 357         ret = wm831x_request_irq(wm831x, irq, wm831x_ldo_uv_irq,
 358                                  IRQF_TRIGGER_RISING, ldo->name,
 359                                  ldo);
 360         if (ret != 0) {
 361                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
 362                         irq, ret);
 363                 goto err_regulator;
 364         }
 365
 366         platform_set_drvdata(pdev, ldo);
 367
 368         return 0;
 369
 370 err_regulator:
 371         regulator_unregister(ldo->regulator);
 372 err:
 373         kfree(ldo);
 374         return ret;
 375 }
 376
 377 static __devexit int wm831x_gp_ldo_remove(struct platform_device *pdev)
 378 {
 379         struct wm831x_ldo *ldo = platform_get_drvdata(pdev);
 380         struct wm831x *wm831x = ldo->wm831x;
 381
 382         platform_set_drvdata(pdev, NULL);
 383
 384         wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), ldo);
 385         regulator_unregister(ldo->regulator);
 386         kfree(ldo);
 387
 388         return 0;
 389 }
 390
 391 static struct platform_driver wm831x_gp_ldo_driver = {
 392         .probe = wm831x_gp_ldo_probe,
 393         .remove = __devexit_p(wm831x_gp_ldo_remove),
 394         .driver         = {
 395                 .name   = "wm831x-ldo",
 396                 .owner  = THIS_MODULE,
 397         },
 398 };
 399
 400 /*
 401  * Analogue LDOs
 402  */
 403
 404
 405 #define WM831X_ALDO_SELECTOR_LOW 0xc
 406 #define WM831X_ALDO_MAX_SELECTOR 0x1f
 407
 408 static int wm831x_aldo_list_voltage(struct regulator_dev *rdev,
 409                                       unsigned int selector)
 410 {
 411         /* 1-1.6V in 50mV steps */
 412         if (selector <= WM831X_ALDO_SELECTOR_LOW)
 413                 return 1000000 + (selector * 50000);
 414         /* 1.7-3.5V in 50mV steps */
 415         if (selector <= WM831X_ALDO_MAX_SELECTOR)
 416                 return 1600000 + ((selector - WM831X_ALDO_SELECTOR_LOW)
 417                                   * 100000);
 418         return -EINVAL;
 419 }
 420
 421 static int wm831x_aldo_set_voltage_int(struct regulator_dev *rdev, int reg,
 422                                        int min_uV, int max_uV,
 423                                        unsigned *selector)
 424 {
 425         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 426         struct wm831x *wm831x = ldo->wm831x;
 427         int vsel, ret;
 428
 429         if (min_uV < 1000000)
 430                 vsel = 0;
 431         else if (min_uV < 1700000)
 432                 vsel = ((min_uV - 1000000) / 50000);
 433         else
 434                 vsel = ((min_uV - 1700000) / 100000)
 435                         + WM831X_ALDO_SELECTOR_LOW + 1;
 436
 437         ret = wm831x_aldo_list_voltage(rdev, vsel);
 438         if (ret < 0)
 439                 return ret;
 440         if (ret < min_uV || ret > max_uV)
 441                 return -EINVAL;
 442
 443         *selector = vsel;
 444
 445         return wm831x_set_bits(wm831x, reg, WM831X_LDO7_ON_VSEL_MASK, vsel);
 446 }
 447
 448 static int wm831x_aldo_set_voltage(struct regulator_dev *rdev,
 449                                    int min_uV, int max_uV, unsigned *selector)
 450 {
 451         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 452         int reg = ldo->base + WM831X_LDO_ON_CONTROL;
 453
 454         return wm831x_aldo_set_voltage_int(rdev, reg, min_uV, max_uV,
 455                                            selector);
 456 }
 457
 458 static int wm831x_aldo_set_suspend_voltage(struct regulator_dev *rdev,
 459                                              int uV)
 460 {
 461         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 462         int reg = ldo->base + WM831X_LDO_SLEEP_CONTROL;
 463         unsigned int selector;
 464
 465         return wm831x_aldo_set_voltage_int(rdev, reg, uV, uV, &selector);
 466 }
 467
 468 static int wm831x_aldo_get_voltage_sel(struct regulator_dev *rdev)
 469 {
 470         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 471         struct wm831x *wm831x = ldo->wm831x;
 472         int reg = ldo->base + WM831X_LDO_ON_CONTROL;
 473         int ret;
 474
 475         ret = wm831x_reg_read(wm831x, reg);
 476         if (ret < 0)
 477                 return ret;
 478
 479         ret &= WM831X_LDO7_ON_VSEL_MASK;
 480
 481         return ret;
 482 }
 483
 484 static unsigned int wm831x_aldo_get_mode(struct regulator_dev *rdev)
 485 {
 486         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 487         struct wm831x *wm831x = ldo->wm831x;
 488         int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
 489         int ret;
 490
 491         ret = wm831x_reg_read(wm831x, on_reg);
 492         if (ret < 0)
 493                 return 0;
 494
 495         if (ret & WM831X_LDO7_ON_MODE)
 496                 return REGULATOR_MODE_IDLE;
 497         else
 498                 return REGULATOR_MODE_NORMAL;
 499 }
 500
 501 static int wm831x_aldo_set_mode(struct regulator_dev *rdev,
 502                                   unsigned int mode)
 503 {
 504         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 505         struct wm831x *wm831x = ldo->wm831x;
 506         int ctrl_reg = ldo->base + WM831X_LDO_CONTROL;
 507         int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
 508         int ret;
 509
 510
 511         switch (mode) {
 512         case REGULATOR_MODE_NORMAL:
 513                 ret = wm831x_set_bits(wm831x, on_reg,
 514                                       WM831X_LDO7_ON_MODE, 0);
 515                 if (ret < 0)
 516                         return ret;
 517                 break;
 518
 519         case REGULATOR_MODE_IDLE:
 520                 ret = wm831x_set_bits(wm831x, ctrl_reg,
 521                                       WM831X_LDO7_ON_MODE,
 522                                       WM831X_LDO7_ON_MODE);
 523                 if (ret < 0)
 524                         return ret;
 525                 break;
 526
 527         default:
 528                 return -EINVAL;
 529         }
 530
 531         return 0;
 532 }
 533
 534 static int wm831x_aldo_get_status(struct regulator_dev *rdev)
 535 {
 536         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 537         struct wm831x *wm831x = ldo->wm831x;
 538         int mask = 1 << rdev_get_id(rdev);
 539         int ret;
 540
 541         /* Is the regulator on? */
 542         ret = wm831x_reg_read(wm831x, WM831X_LDO_STATUS);
 543         if (ret < 0)
 544                 return ret;
 545         if (!(ret & mask))
 546                 return REGULATOR_STATUS_OFF;
 547
 548         /* Is it reporting under voltage? */
 549         ret = wm831x_reg_read(wm831x, WM831X_LDO_UV_STATUS);
 550         if (ret & mask)
 551                 return REGULATOR_STATUS_ERROR;
 552
 553         ret = wm831x_aldo_get_mode(rdev);
 554         if (ret < 0)
 555                 return ret;
 556         else
 557                 return regulator_mode_to_status(ret);
 558 }
 559
 560 static struct regulator_ops wm831x_aldo_ops = {
 561         .list_voltage = wm831x_aldo_list_voltage,
 562         .get_voltage_sel = wm831x_aldo_get_voltage_sel,
 563         .set_voltage = wm831x_aldo_set_voltage,
 564         .set_suspend_voltage = wm831x_aldo_set_suspend_voltage,
 565         .get_mode = wm831x_aldo_get_mode,
 566         .set_mode = wm831x_aldo_set_mode,
 567         .get_status = wm831x_aldo_get_status,
 568
 569         .is_enabled = wm831x_ldo_is_enabled,
 570         .enable = wm831x_ldo_enable,
 571         .disable = wm831x_ldo_disable,
 572 };
 573
 574 static __devinit int wm831x_aldo_probe(struct platform_device *pdev)
 575 {
 576         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 577         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
 578         int id = pdev->id % ARRAY_SIZE(pdata->ldo);
 579         struct wm831x_ldo *ldo;
 580         struct resource *res;
 581         int ret, irq;
 582
 583         dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
 584
 585         if (pdata == NULL || pdata->ldo[id] == NULL)
 586                 return -ENODEV;
 587
 588         ldo = kzalloc(sizeof(struct wm831x_ldo), GFP_KERNEL);
 589         if (ldo == NULL) {
 590                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 591                 return -ENOMEM;
 592         }
 593
 594         ldo->wm831x = wm831x;
 595
 596         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 597         if (res == NULL) {
 598                 dev_err(&pdev->dev, "No I/O 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         ldo->desc.id = id;
 607         ldo->desc.type = REGULATOR_VOLTAGE;
 608         ldo->desc.n_voltages = WM831X_ALDO_MAX_SELECTOR + 1;
 609         ldo->desc.ops = &wm831x_aldo_ops;
 610         ldo->desc.owner = THIS_MODULE;
 611
 612         ldo->regulator = regulator_register(&ldo->desc, &pdev->dev,
 613                                              pdata->ldo[id], ldo);
 614         if (IS_ERR(ldo->regulator)) {
 615                 ret = PTR_ERR(ldo->regulator);
 616                 dev_err(wm831x->dev, "Failed to register LDO%d: %d\n",
 617                         id + 1, ret);
 618                 goto err;
 619         }
 620
 621         irq = platform_get_irq_byname(pdev, "UV");
 622         ret = wm831x_request_irq(wm831x, irq, wm831x_ldo_uv_irq,
 623                                  IRQF_TRIGGER_RISING, ldo->name,
 624                                  ldo);
 625         if (ret != 0) {
 626                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
 627                         irq, ret);
 628                 goto err_regulator;
 629         }
 630
 631         platform_set_drvdata(pdev, ldo);
 632
 633         return 0;
 634
 635 err_regulator:
 636         regulator_unregister(ldo->regulator);
 637 err:
 638         kfree(ldo);
 639         return ret;
 640 }
 641
 642 static __devexit int wm831x_aldo_remove(struct platform_device *pdev)
 643 {
 644         struct wm831x_ldo *ldo = platform_get_drvdata(pdev);
 645         struct wm831x *wm831x = ldo->wm831x;
 646
 647         wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), ldo);
 648         regulator_unregister(ldo->regulator);
 649         kfree(ldo);
 650
 651         return 0;
 652 }
 653
 654 static struct platform_driver wm831x_aldo_driver = {
 655         .probe = wm831x_aldo_probe,
 656         .remove = __devexit_p(wm831x_aldo_remove),
 657         .driver         = {
 658                 .name   = "wm831x-aldo",
 659                 .owner  = THIS_MODULE,
 660         },
 661 };
 662
 663 /*
 664  * Alive LDO
 665  */
 666
 667 #define WM831X_ALIVE_LDO_MAX_SELECTOR 0xf
 668
 669 static int wm831x_alive_ldo_list_voltage(struct regulator_dev *rdev,
 670                                       unsigned int selector)
 671 {
 672         /* 0.8-1.55V in 50mV steps */
 673         if (selector <= WM831X_ALIVE_LDO_MAX_SELECTOR)
 674                 return 800000 + (selector * 50000);
 675         return -EINVAL;
 676 }
 677
 678 static int wm831x_alive_ldo_set_voltage_int(struct regulator_dev *rdev,
 679                                             int reg,
 680                                             int min_uV, int max_uV,
 681                                             unsigned *selector)
 682 {
 683         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 684         struct wm831x *wm831x = ldo->wm831x;
 685         int vsel, ret;
 686
 687         vsel = (min_uV - 800000) / 50000;
 688
 689         ret = wm831x_alive_ldo_list_voltage(rdev, vsel);
 690         if (ret < 0)
 691                 return ret;
 692         if (ret < min_uV || ret > max_uV)
 693                 return -EINVAL;
 694
 695         *selector = vsel;
 696
 697         return wm831x_set_bits(wm831x, reg, WM831X_LDO11_ON_VSEL_MASK, vsel);
 698 }
 699
 700 static int wm831x_alive_ldo_set_voltage(struct regulator_dev *rdev,
 701                                         int min_uV, int max_uV,
 702                                         unsigned *selector)
 703 {
 704         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 705         int reg = ldo->base + WM831X_ALIVE_LDO_ON_CONTROL;
 706
 707         return wm831x_alive_ldo_set_voltage_int(rdev, reg, min_uV, max_uV,
 708                                                 selector);
 709 }
 710
 711 static int wm831x_alive_ldo_set_suspend_voltage(struct regulator_dev *rdev,
 712                                              int uV)
 713 {
 714         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 715         int reg = ldo->base + WM831X_ALIVE_LDO_SLEEP_CONTROL;
 716         unsigned selector;
 717
 718         return wm831x_alive_ldo_set_voltage_int(rdev, reg, uV, uV, &selector);
 719 }
 720
 721 static int wm831x_alive_ldo_get_voltage_sel(struct regulator_dev *rdev)
 722 {
 723         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 724         struct wm831x *wm831x = ldo->wm831x;
 725         int reg = ldo->base + WM831X_ALIVE_LDO_ON_CONTROL;
 726         int ret;
 727
 728         ret = wm831x_reg_read(wm831x, reg);
 729         if (ret < 0)
 730                 return ret;
 731
 732         ret &= WM831X_LDO11_ON_VSEL_MASK;
 733
 734         return ret;
 735 }
 736
 737 static int wm831x_alive_ldo_get_status(struct regulator_dev *rdev)
 738 {
 739         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 740         struct wm831x *wm831x = ldo->wm831x;
 741         int mask = 1 << rdev_get_id(rdev);
 742         int ret;
 743
 744         /* Is the regulator on? */
 745         ret = wm831x_reg_read(wm831x, WM831X_LDO_STATUS);
 746         if (ret < 0)
 747                 return ret;
 748         if (ret & mask)
 749                 return REGULATOR_STATUS_ON;
 750         else
 751                 return REGULATOR_STATUS_OFF;
 752 }
 753
 754 static struct regulator_ops wm831x_alive_ldo_ops = {
 755         .list_voltage = wm831x_alive_ldo_list_voltage,
 756         .get_voltage_sel = wm831x_alive_ldo_get_voltage_sel,
 757         .set_voltage = wm831x_alive_ldo_set_voltage,
 758         .set_suspend_voltage = wm831x_alive_ldo_set_suspend_voltage,
 759         .get_status = wm831x_alive_ldo_get_status,
 760
 761         .is_enabled = wm831x_ldo_is_enabled,
 762         .enable = wm831x_ldo_enable,
 763         .disable = wm831x_ldo_disable,
 764 };
 765
 766 static __devinit int wm831x_alive_ldo_probe(struct platform_device *pdev)
 767 {
 768         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 769         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
 770         int id = pdev->id % ARRAY_SIZE(pdata->ldo);
 771         struct wm831x_ldo *ldo;
 772         struct resource *res;
 773         int ret;
 774
 775         dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
 776
 777         if (pdata == NULL || pdata->ldo[id] == NULL)
 778                 return -ENODEV;
 779
 780         ldo = kzalloc(sizeof(struct wm831x_ldo), GFP_KERNEL);
 781         if (ldo == NULL) {
 782                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 783                 return -ENOMEM;
 784         }
 785
 786         ldo->wm831x = wm831x;
 787
 788         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 789         if (res == NULL) {
 790                 dev_err(&pdev->dev, "No I/O resource\n");
 791                 ret = -EINVAL;
 792                 goto err;
 793         }
 794         ldo->base = res->start;
 795
 796         snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1);
 797         ldo->desc.name = ldo->name;
 798         ldo->desc.id = id;
 799         ldo->desc.type = REGULATOR_VOLTAGE;
 800         ldo->desc.n_voltages = WM831X_ALIVE_LDO_MAX_SELECTOR + 1;
 801         ldo->desc.ops = &wm831x_alive_ldo_ops;
 802         ldo->desc.owner = THIS_MODULE;
 803
 804         ldo->regulator = regulator_register(&ldo->desc, &pdev->dev,
 805                                              pdata->ldo[id], ldo);
 806         if (IS_ERR(ldo->regulator)) {
 807                 ret = PTR_ERR(ldo->regulator);
 808                 dev_err(wm831x->dev, "Failed to register LDO%d: %d\n",
 809                         id + 1, ret);
 810                 goto err;
 811         }
 812
 813         platform_set_drvdata(pdev, ldo);
 814
 815         return 0;
 816
 817 err:
 818         kfree(ldo);
 819         return ret;
 820 }
 821
 822 static __devexit int wm831x_alive_ldo_remove(struct platform_device *pdev)
 823 {
 824         struct wm831x_ldo *ldo = platform_get_drvdata(pdev);
 825
 826         regulator_unregister(ldo->regulator);
 827         kfree(ldo);
 828
 829         return 0;
 830 }
 831
 832 static struct platform_driver wm831x_alive_ldo_driver = {
 833         .probe = wm831x_alive_ldo_probe,
 834         .remove = __devexit_p(wm831x_alive_ldo_remove),
 835         .driver         = {
 836                 .name   = "wm831x-alive-ldo",
 837                 .owner  = THIS_MODULE,
 838         },
 839 };
 840
 841 static int __init wm831x_ldo_init(void)
 842 {
 843         int ret;
 844
 845         ret = platform_driver_register(&wm831x_gp_ldo_driver);
 846         if (ret != 0)
 847                 pr_err("Failed to register WM831x GP LDO driver: %d\n", ret);
 848
 849         ret = platform_driver_register(&wm831x_aldo_driver);
 850         if (ret != 0)
 851                 pr_err("Failed to register WM831x ALDO driver: %d\n", ret);
 852
 853         ret = platform_driver_register(&wm831x_alive_ldo_driver);
 854         if (ret != 0)
 855                 pr_err("Failed to register WM831x alive LDO driver: %d\n",
 856                        ret);
 857
 858         return 0;
 859 }
 860 subsys_initcall(wm831x_ldo_init);
 861
 862 static void __exit wm831x_ldo_exit(void)
 863 {
 864         platform_driver_unregister(&wm831x_alive_ldo_driver);
 865         platform_driver_unregister(&wm831x_aldo_driver);
 866         platform_driver_unregister(&wm831x_gp_ldo_driver);
 867 }
 868 module_exit(wm831x_ldo_exit);
 869
 870 /* Module information */
 871 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 872 MODULE_DESCRIPTION("WM831x LDO driver");
 873 MODULE_LICENSE("GPL");
 874 MODULE_ALIAS("platform:wm831x-ldo");
 875 MODULE_ALIAS("platform:wm831x-aldo");
 876 MODULE_ALIAS("platform:wm831x-aliveldo");