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 = request_threaded_irq(irq, NULL, 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
 381         platform_set_drvdata(pdev, NULL);
 382
 383         free_irq(platform_get_irq_byname(pdev, "UV"), ldo);
 384         regulator_unregister(ldo->regulator);
 385         kfree(ldo);
 386
 387         return 0;
 388 }
 389
 390 static struct platform_driver wm831x_gp_ldo_driver = {
 391         .probe = wm831x_gp_ldo_probe,
 392         .remove = __devexit_p(wm831x_gp_ldo_remove),
 393         .driver         = {
 394                 .name   = "wm831x-ldo",
 395                 .owner  = THIS_MODULE,
 396         },
 397 };
 398
 399 /*
 400  * Analogue LDOs
 401  */
 402
 403
 404 #define WM831X_ALDO_SELECTOR_LOW 0xc
 405 #define WM831X_ALDO_MAX_SELECTOR 0x1f
 406
 407 static int wm831x_aldo_list_voltage(struct regulator_dev *rdev,
 408                                       unsigned int selector)
 409 {
 410         /* 1-1.6V in 50mV steps */
 411         if (selector <= WM831X_ALDO_SELECTOR_LOW)
 412                 return 1000000 + (selector * 50000);
 413         /* 1.7-3.5V in 50mV steps */
 414         if (selector <= WM831X_ALDO_MAX_SELECTOR)
 415                 return 1600000 + ((selector - WM831X_ALDO_SELECTOR_LOW)
 416                                   * 100000);
 417         return -EINVAL;
 418 }
 419
 420 static int wm831x_aldo_set_voltage_int(struct regulator_dev *rdev, int reg,
 421                                        int min_uV, int max_uV,
 422                                        unsigned *selector)
 423 {
 424         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 425         struct wm831x *wm831x = ldo->wm831x;
 426         int vsel, ret;
 427
 428         if (min_uV < 1000000)
 429                 vsel = 0;
 430         else if (min_uV < 1700000)
 431                 vsel = ((min_uV - 1000000) / 50000);
 432         else
 433                 vsel = ((min_uV - 1700000) / 100000)
 434                         + WM831X_ALDO_SELECTOR_LOW + 1;
 435
 436         ret = wm831x_aldo_list_voltage(rdev, vsel);
 437         if (ret < 0)
 438                 return ret;
 439         if (ret < min_uV || ret > max_uV)
 440                 return -EINVAL;
 441
 442         *selector = vsel;
 443
 444         return wm831x_set_bits(wm831x, reg, WM831X_LDO7_ON_VSEL_MASK, vsel);
 445 }
 446
 447 static int wm831x_aldo_set_voltage(struct regulator_dev *rdev,
 448                                    int min_uV, int max_uV, unsigned *selector)
 449 {
 450         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 451         int reg = ldo->base + WM831X_LDO_ON_CONTROL;
 452
 453         return wm831x_aldo_set_voltage_int(rdev, reg, min_uV, max_uV,
 454                                            selector);
 455 }
 456
 457 static int wm831x_aldo_set_suspend_voltage(struct regulator_dev *rdev,
 458                                              int uV)
 459 {
 460         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 461         int reg = ldo->base + WM831X_LDO_SLEEP_CONTROL;
 462         unsigned int selector;
 463
 464         return wm831x_aldo_set_voltage_int(rdev, reg, uV, uV, &selector);
 465 }
 466
 467 static int wm831x_aldo_get_voltage_sel(struct regulator_dev *rdev)
 468 {
 469         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 470         struct wm831x *wm831x = ldo->wm831x;
 471         int reg = ldo->base + WM831X_LDO_ON_CONTROL;
 472         int ret;
 473
 474         ret = wm831x_reg_read(wm831x, reg);
 475         if (ret < 0)
 476                 return ret;
 477
 478         ret &= WM831X_LDO7_ON_VSEL_MASK;
 479
 480         return ret;
 481 }
 482
 483 static unsigned int wm831x_aldo_get_mode(struct regulator_dev *rdev)
 484 {
 485         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 486         struct wm831x *wm831x = ldo->wm831x;
 487         int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
 488         int ret;
 489
 490         ret = wm831x_reg_read(wm831x, on_reg);
 491         if (ret < 0)
 492                 return 0;
 493
 494         if (ret & WM831X_LDO7_ON_MODE)
 495                 return REGULATOR_MODE_IDLE;
 496         else
 497                 return REGULATOR_MODE_NORMAL;
 498 }
 499
 500 static int wm831x_aldo_set_mode(struct regulator_dev *rdev,
 501                                   unsigned int mode)
 502 {
 503         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 504         struct wm831x *wm831x = ldo->wm831x;
 505         int ctrl_reg = ldo->base + WM831X_LDO_CONTROL;
 506         int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
 507         int ret;
 508
 509
 510         switch (mode) {
 511         case REGULATOR_MODE_NORMAL:
 512                 ret = wm831x_set_bits(wm831x, on_reg,
 513                                       WM831X_LDO7_ON_MODE, 0);
 514                 if (ret < 0)
 515                         return ret;
 516                 break;
 517
 518         case REGULATOR_MODE_IDLE:
 519                 ret = wm831x_set_bits(wm831x, ctrl_reg,
 520                                       WM831X_LDO7_ON_MODE,
 521                                       WM831X_LDO7_ON_MODE);
 522                 if (ret < 0)
 523                         return ret;
 524                 break;
 525
 526         default:
 527                 return -EINVAL;
 528         }
 529
 530         return 0;
 531 }
 532
 533 static int wm831x_aldo_get_status(struct regulator_dev *rdev)
 534 {
 535         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 536         struct wm831x *wm831x = ldo->wm831x;
 537         int mask = 1 << rdev_get_id(rdev);
 538         int ret;
 539
 540         /* Is the regulator on? */
 541         ret = wm831x_reg_read(wm831x, WM831X_LDO_STATUS);
 542         if (ret < 0)
 543                 return ret;
 544         if (!(ret & mask))
 545                 return REGULATOR_STATUS_OFF;
 546
 547         /* Is it reporting under voltage? */
 548         ret = wm831x_reg_read(wm831x, WM831X_LDO_UV_STATUS);
 549         if (ret & mask)
 550                 return REGULATOR_STATUS_ERROR;
 551
 552         ret = wm831x_aldo_get_mode(rdev);
 553         if (ret < 0)
 554                 return ret;
 555         else
 556                 return regulator_mode_to_status(ret);
 557 }
 558
 559 static struct regulator_ops wm831x_aldo_ops = {
 560         .list_voltage = wm831x_aldo_list_voltage,
 561         .get_voltage_sel = wm831x_aldo_get_voltage_sel,
 562         .set_voltage = wm831x_aldo_set_voltage,
 563         .set_suspend_voltage = wm831x_aldo_set_suspend_voltage,
 564         .get_mode = wm831x_aldo_get_mode,
 565         .set_mode = wm831x_aldo_set_mode,
 566         .get_status = wm831x_aldo_get_status,
 567
 568         .is_enabled = wm831x_ldo_is_enabled,
 569         .enable = wm831x_ldo_enable,
 570         .disable = wm831x_ldo_disable,
 571 };
 572
 573 static __devinit int wm831x_aldo_probe(struct platform_device *pdev)
 574 {
 575         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 576         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
 577         int id = pdev->id % ARRAY_SIZE(pdata->ldo);
 578         struct wm831x_ldo *ldo;
 579         struct resource *res;
 580         int ret, irq;
 581
 582         dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
 583
 584         if (pdata == NULL || pdata->ldo[id] == NULL)
 585                 return -ENODEV;
 586
 587         ldo = kzalloc(sizeof(struct wm831x_ldo), GFP_KERNEL);
 588         if (ldo == NULL) {
 589                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 590                 return -ENOMEM;
 591         }
 592
 593         ldo->wm831x = wm831x;
 594
 595         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 596         if (res == NULL) {
 597                 dev_err(&pdev->dev, "No I/O 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         ldo->desc.id = id;
 606         ldo->desc.type = REGULATOR_VOLTAGE;
 607         ldo->desc.n_voltages = WM831X_ALDO_MAX_SELECTOR + 1;
 608         ldo->desc.ops = &wm831x_aldo_ops;
 609         ldo->desc.owner = THIS_MODULE;
 610
 611         ldo->regulator = regulator_register(&ldo->desc, &pdev->dev,
 612                                              pdata->ldo[id], ldo);
 613         if (IS_ERR(ldo->regulator)) {
 614                 ret = PTR_ERR(ldo->regulator);
 615                 dev_err(wm831x->dev, "Failed to register LDO%d: %d\n",
 616                         id + 1, ret);
 617                 goto err;
 618         }
 619
 620         irq = platform_get_irq_byname(pdev, "UV");
 621         ret = request_threaded_irq(irq, NULL, wm831x_ldo_uv_irq,
 622                                    IRQF_TRIGGER_RISING, ldo->name, ldo);
 623         if (ret != 0) {
 624                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
 625                         irq, ret);
 626                 goto err_regulator;
 627         }
 628
 629         platform_set_drvdata(pdev, ldo);
 630
 631         return 0;
 632
 633 err_regulator:
 634         regulator_unregister(ldo->regulator);
 635 err:
 636         kfree(ldo);
 637         return ret;
 638 }
 639
 640 static __devexit int wm831x_aldo_remove(struct platform_device *pdev)
 641 {
 642         struct wm831x_ldo *ldo = platform_get_drvdata(pdev);
 643
 644         free_irq(platform_get_irq_byname(pdev, "UV"), ldo);
 645         regulator_unregister(ldo->regulator);
 646         kfree(ldo);
 647
 648         return 0;
 649 }
 650
 651 static struct platform_driver wm831x_aldo_driver = {
 652         .probe = wm831x_aldo_probe,
 653         .remove = __devexit_p(wm831x_aldo_remove),
 654         .driver         = {
 655                 .name   = "wm831x-aldo",
 656                 .owner  = THIS_MODULE,
 657         },
 658 };
 659
 660 /*
 661  * Alive LDO
 662  */
 663
 664 #define WM831X_ALIVE_LDO_MAX_SELECTOR 0xf
 665
 666 static int wm831x_alive_ldo_list_voltage(struct regulator_dev *rdev,
 667                                       unsigned int selector)
 668 {
 669         /* 0.8-1.55V in 50mV steps */
 670         if (selector <= WM831X_ALIVE_LDO_MAX_SELECTOR)
 671                 return 800000 + (selector * 50000);
 672         return -EINVAL;
 673 }
 674
 675 static int wm831x_alive_ldo_set_voltage_int(struct regulator_dev *rdev,
 676                                             int reg,
 677                                             int min_uV, int max_uV,
 678                                             unsigned *selector)
 679 {
 680         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 681         struct wm831x *wm831x = ldo->wm831x;
 682         int vsel, ret;
 683
 684         vsel = (min_uV - 800000) / 50000;
 685
 686         ret = wm831x_alive_ldo_list_voltage(rdev, vsel);
 687         if (ret < 0)
 688                 return ret;
 689         if (ret < min_uV || ret > max_uV)
 690                 return -EINVAL;
 691
 692         *selector = vsel;
 693
 694         return wm831x_set_bits(wm831x, reg, WM831X_LDO11_ON_VSEL_MASK, vsel);
 695 }
 696
 697 static int wm831x_alive_ldo_set_voltage(struct regulator_dev *rdev,
 698                                         int min_uV, int max_uV,
 699                                         unsigned *selector)
 700 {
 701         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 702         int reg = ldo->base + WM831X_ALIVE_LDO_ON_CONTROL;
 703
 704         return wm831x_alive_ldo_set_voltage_int(rdev, reg, min_uV, max_uV,
 705                                                 selector);
 706 }
 707
 708 static int wm831x_alive_ldo_set_suspend_voltage(struct regulator_dev *rdev,
 709                                              int uV)
 710 {
 711         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 712         int reg = ldo->base + WM831X_ALIVE_LDO_SLEEP_CONTROL;
 713         unsigned selector;
 714
 715         return wm831x_alive_ldo_set_voltage_int(rdev, reg, uV, uV, &selector);
 716 }
 717
 718 static int wm831x_alive_ldo_get_voltage_sel(struct regulator_dev *rdev)
 719 {
 720         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 721         struct wm831x *wm831x = ldo->wm831x;
 722         int reg = ldo->base + WM831X_ALIVE_LDO_ON_CONTROL;
 723         int ret;
 724
 725         ret = wm831x_reg_read(wm831x, reg);
 726         if (ret < 0)
 727                 return ret;
 728
 729         ret &= WM831X_LDO11_ON_VSEL_MASK;
 730
 731         return ret;
 732 }
 733
 734 static int wm831x_alive_ldo_get_status(struct regulator_dev *rdev)
 735 {
 736         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 737         struct wm831x *wm831x = ldo->wm831x;
 738         int mask = 1 << rdev_get_id(rdev);
 739         int ret;
 740
 741         /* Is the regulator on? */
 742         ret = wm831x_reg_read(wm831x, WM831X_LDO_STATUS);
 743         if (ret < 0)
 744                 return ret;
 745         if (ret & mask)
 746                 return REGULATOR_STATUS_ON;
 747         else
 748                 return REGULATOR_STATUS_OFF;
 749 }
 750
 751 static struct regulator_ops wm831x_alive_ldo_ops = {
 752         .list_voltage = wm831x_alive_ldo_list_voltage,
 753         .get_voltage_sel = wm831x_alive_ldo_get_voltage_sel,
 754         .set_voltage = wm831x_alive_ldo_set_voltage,
 755         .set_suspend_voltage = wm831x_alive_ldo_set_suspend_voltage,
 756         .get_status = wm831x_alive_ldo_get_status,
 757
 758         .is_enabled = wm831x_ldo_is_enabled,
 759         .enable = wm831x_ldo_enable,
 760         .disable = wm831x_ldo_disable,
 761 };
 762
 763 static __devinit int wm831x_alive_ldo_probe(struct platform_device *pdev)
 764 {
 765         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 766         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
 767         int id = pdev->id % ARRAY_SIZE(pdata->ldo);
 768         struct wm831x_ldo *ldo;
 769         struct resource *res;
 770         int ret;
 771
 772         dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
 773
 774         if (pdata == NULL || pdata->ldo[id] == NULL)
 775                 return -ENODEV;
 776
 777         ldo = kzalloc(sizeof(struct wm831x_ldo), GFP_KERNEL);
 778         if (ldo == NULL) {
 779                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 780                 return -ENOMEM;
 781         }
 782
 783         ldo->wm831x = wm831x;
 784
 785         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 786         if (res == NULL) {
 787                 dev_err(&pdev->dev, "No I/O resource\n");
 788                 ret = -EINVAL;
 789                 goto err;
 790         }
 791         ldo->base = res->start;
 792
 793         snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1);
 794         ldo->desc.name = ldo->name;
 795         ldo->desc.id = id;
 796         ldo->desc.type = REGULATOR_VOLTAGE;
 797         ldo->desc.n_voltages = WM831X_ALIVE_LDO_MAX_SELECTOR + 1;
 798         ldo->desc.ops = &wm831x_alive_ldo_ops;
 799         ldo->desc.owner = THIS_MODULE;
 800
 801         ldo->regulator = regulator_register(&ldo->desc, &pdev->dev,
 802                                              pdata->ldo[id], ldo);
 803         if (IS_ERR(ldo->regulator)) {
 804                 ret = PTR_ERR(ldo->regulator);
 805                 dev_err(wm831x->dev, "Failed to register LDO%d: %d\n",
 806                         id + 1, ret);
 807                 goto err;
 808         }
 809
 810         platform_set_drvdata(pdev, ldo);
 811
 812         return 0;
 813
 814 err:
 815         kfree(ldo);
 816         return ret;
 817 }
 818
 819 static __devexit int wm831x_alive_ldo_remove(struct platform_device *pdev)
 820 {
 821         struct wm831x_ldo *ldo = platform_get_drvdata(pdev);
 822
 823         regulator_unregister(ldo->regulator);
 824         kfree(ldo);
 825
 826         return 0;
 827 }
 828
 829 static struct platform_driver wm831x_alive_ldo_driver = {
 830         .probe = wm831x_alive_ldo_probe,
 831         .remove = __devexit_p(wm831x_alive_ldo_remove),
 832         .driver         = {
 833                 .name   = "wm831x-alive-ldo",
 834                 .owner  = THIS_MODULE,
 835         },
 836 };
 837
 838 static int __init wm831x_ldo_init(void)
 839 {
 840         int ret;
 841
 842         ret = platform_driver_register(&wm831x_gp_ldo_driver);
 843         if (ret != 0)
 844                 pr_err("Failed to register WM831x GP LDO driver: %d\n", ret);
 845
 846         ret = platform_driver_register(&wm831x_aldo_driver);
 847         if (ret != 0)
 848                 pr_err("Failed to register WM831x ALDO driver: %d\n", ret);
 849
 850         ret = platform_driver_register(&wm831x_alive_ldo_driver);
 851         if (ret != 0)
 852                 pr_err("Failed to register WM831x alive LDO driver: %d\n",
 853                        ret);
 854
 855         return 0;
 856 }
 857 subsys_initcall(wm831x_ldo_init);
 858
 859 static void __exit wm831x_ldo_exit(void)
 860 {
 861         platform_driver_unregister(&wm831x_alive_ldo_driver);
 862         platform_driver_unregister(&wm831x_aldo_driver);
 863         platform_driver_unregister(&wm831x_gp_ldo_driver);
 864 }
 865 module_exit(wm831x_ldo_exit);
 866
 867 /* Module information */
 868 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 869 MODULE_DESCRIPTION("WM831x LDO driver");
 870 MODULE_LICENSE("GPL");
 871 MODULE_ALIAS("platform:wm831x-ldo");
 872 MODULE_ALIAS("platform:wm831x-aldo");
 873 MODULE_ALIAS("platform:wm831x-aliveldo");