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;
 314         struct wm831x_ldo *ldo;
 315         struct resource *res;
 316         int ret, irq;
 317
 318         if (pdata && pdata->wm831x_num)
 319                 id = (pdata->wm831x_num * 10) + 1;
 320         else
 321                 id = 0;
 322         id = pdev->id - id;
 323
 324         dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
 325
 326         if (pdata == NULL || pdata->ldo[id] == NULL)
 327                 return -ENODEV;
 328
 329         ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ldo), GFP_KERNEL);
 330         if (ldo == NULL) {
 331                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 332                 return -ENOMEM;
 333         }
 334
 335         ldo->wm831x = wm831x;
 336
 337         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 338         if (res == NULL) {
 339                 dev_err(&pdev->dev, "No I/O resource\n");
 340                 ret = -EINVAL;
 341                 goto err;
 342         }
 343         ldo->base = res->start;
 344
 345         snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1);
 346         ldo->desc.name = ldo->name;
 347         ldo->desc.id = id;
 348         ldo->desc.type = REGULATOR_VOLTAGE;
 349         ldo->desc.n_voltages = WM831X_GP_LDO_MAX_SELECTOR + 1;
 350         ldo->desc.ops = &wm831x_gp_ldo_ops;
 351         ldo->desc.owner = THIS_MODULE;
 352
 353         ldo->regulator = regulator_register(&ldo->desc, &pdev->dev,
 354                                              pdata->ldo[id], ldo, NULL);
 355         if (IS_ERR(ldo->regulator)) {
 356                 ret = PTR_ERR(ldo->regulator);
 357                 dev_err(wm831x->dev, "Failed to register LDO%d: %d\n",
 358                         id + 1, ret);
 359                 goto err;
 360         }
 361
 362         irq = platform_get_irq_byname(pdev, "UV");
 363         ret = request_threaded_irq(irq, NULL, wm831x_ldo_uv_irq,
 364                                    IRQF_TRIGGER_RISING, ldo->name,
 365                                    ldo);
 366         if (ret != 0) {
 367                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
 368                         irq, ret);
 369                 goto err_regulator;
 370         }
 371
 372         platform_set_drvdata(pdev, ldo);
 373
 374         return 0;
 375
 376 err_regulator:
 377         regulator_unregister(ldo->regulator);
 378 err:
 379         return ret;
 380 }
 381
 382 static __devexit int wm831x_gp_ldo_remove(struct platform_device *pdev)
 383 {
 384         struct wm831x_ldo *ldo = platform_get_drvdata(pdev);
 385
 386         platform_set_drvdata(pdev, NULL);
 387
 388         free_irq(platform_get_irq_byname(pdev, "UV"), ldo);
 389         regulator_unregister(ldo->regulator);
 390
 391         return 0;
 392 }
 393
 394 static struct platform_driver wm831x_gp_ldo_driver = {
 395         .probe = wm831x_gp_ldo_probe,
 396         .remove = __devexit_p(wm831x_gp_ldo_remove),
 397         .driver         = {
 398                 .name   = "wm831x-ldo",
 399                 .owner  = THIS_MODULE,
 400         },
 401 };
 402
 403 /*
 404  * Analogue LDOs
 405  */
 406
 407
 408 #define WM831X_ALDO_SELECTOR_LOW 0xc
 409 #define WM831X_ALDO_MAX_SELECTOR 0x1f
 410
 411 static int wm831x_aldo_list_voltage(struct regulator_dev *rdev,
 412                                       unsigned int selector)
 413 {
 414         /* 1-1.6V in 50mV steps */
 415         if (selector <= WM831X_ALDO_SELECTOR_LOW)
 416                 return 1000000 + (selector * 50000);
 417         /* 1.7-3.5V in 50mV steps */
 418         if (selector <= WM831X_ALDO_MAX_SELECTOR)
 419                 return 1600000 + ((selector - WM831X_ALDO_SELECTOR_LOW)
 420                                   * 100000);
 421         return -EINVAL;
 422 }
 423
 424 static int wm831x_aldo_set_voltage_int(struct regulator_dev *rdev, int reg,
 425                                        int min_uV, int max_uV,
 426                                        unsigned *selector)
 427 {
 428         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 429         struct wm831x *wm831x = ldo->wm831x;
 430         int vsel, ret;
 431
 432         if (min_uV < 1000000)
 433                 vsel = 0;
 434         else if (min_uV < 1700000)
 435                 vsel = ((min_uV - 1000000) / 50000);
 436         else
 437                 vsel = ((min_uV - 1700000) / 100000)
 438                         + WM831X_ALDO_SELECTOR_LOW + 1;
 439
 440         ret = wm831x_aldo_list_voltage(rdev, vsel);
 441         if (ret < 0)
 442                 return ret;
 443         if (ret < min_uV || ret > max_uV)
 444                 return -EINVAL;
 445
 446         *selector = vsel;
 447
 448         return wm831x_set_bits(wm831x, reg, WM831X_LDO7_ON_VSEL_MASK, vsel);
 449 }
 450
 451 static int wm831x_aldo_set_voltage(struct regulator_dev *rdev,
 452                                    int min_uV, int max_uV, unsigned *selector)
 453 {
 454         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 455         int reg = ldo->base + WM831X_LDO_ON_CONTROL;
 456
 457         return wm831x_aldo_set_voltage_int(rdev, reg, min_uV, max_uV,
 458                                            selector);
 459 }
 460
 461 static int wm831x_aldo_set_suspend_voltage(struct regulator_dev *rdev,
 462                                              int uV)
 463 {
 464         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 465         int reg = ldo->base + WM831X_LDO_SLEEP_CONTROL;
 466         unsigned int selector;
 467
 468         return wm831x_aldo_set_voltage_int(rdev, reg, uV, uV, &selector);
 469 }
 470
 471 static int wm831x_aldo_get_voltage_sel(struct regulator_dev *rdev)
 472 {
 473         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 474         struct wm831x *wm831x = ldo->wm831x;
 475         int reg = ldo->base + WM831X_LDO_ON_CONTROL;
 476         int ret;
 477
 478         ret = wm831x_reg_read(wm831x, reg);
 479         if (ret < 0)
 480                 return ret;
 481
 482         ret &= WM831X_LDO7_ON_VSEL_MASK;
 483
 484         return ret;
 485 }
 486
 487 static unsigned int wm831x_aldo_get_mode(struct regulator_dev *rdev)
 488 {
 489         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 490         struct wm831x *wm831x = ldo->wm831x;
 491         int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
 492         int ret;
 493
 494         ret = wm831x_reg_read(wm831x, on_reg);
 495         if (ret < 0)
 496                 return 0;
 497
 498         if (ret & WM831X_LDO7_ON_MODE)
 499                 return REGULATOR_MODE_IDLE;
 500         else
 501                 return REGULATOR_MODE_NORMAL;
 502 }
 503
 504 static int wm831x_aldo_set_mode(struct regulator_dev *rdev,
 505                                   unsigned int mode)
 506 {
 507         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 508         struct wm831x *wm831x = ldo->wm831x;
 509         int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
 510         int ret;
 511
 512
 513         switch (mode) {
 514         case REGULATOR_MODE_NORMAL:
 515                 ret = wm831x_set_bits(wm831x, on_reg, WM831X_LDO7_ON_MODE, 0);
 516                 if (ret < 0)
 517                         return ret;
 518                 break;
 519
 520         case REGULATOR_MODE_IDLE:
 521                 ret = wm831x_set_bits(wm831x, on_reg, 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;
 579         struct wm831x_ldo *ldo;
 580         struct resource *res;
 581         int ret, irq;
 582
 583         if (pdata && pdata->wm831x_num)
 584                 id = (pdata->wm831x_num * 10) + 1;
 585         else
 586                 id = 0;
 587         id = pdev->id - id;
 588
 589         dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
 590
 591         if (pdata == NULL || pdata->ldo[id] == NULL)
 592                 return -ENODEV;
 593
 594         ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ldo), GFP_KERNEL);
 595         if (ldo == NULL) {
 596                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 597                 return -ENOMEM;
 598         }
 599
 600         ldo->wm831x = wm831x;
 601
 602         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 603         if (res == NULL) {
 604                 dev_err(&pdev->dev, "No I/O resource\n");
 605                 ret = -EINVAL;
 606                 goto err;
 607         }
 608         ldo->base = res->start;
 609
 610         snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1);
 611         ldo->desc.name = ldo->name;
 612         ldo->desc.id = id;
 613         ldo->desc.type = REGULATOR_VOLTAGE;
 614         ldo->desc.n_voltages = WM831X_ALDO_MAX_SELECTOR + 1;
 615         ldo->desc.ops = &wm831x_aldo_ops;
 616         ldo->desc.owner = THIS_MODULE;
 617
 618         ldo->regulator = regulator_register(&ldo->desc, &pdev->dev,
 619                                              pdata->ldo[id], ldo, NULL);
 620         if (IS_ERR(ldo->regulator)) {
 621                 ret = PTR_ERR(ldo->regulator);
 622                 dev_err(wm831x->dev, "Failed to register LDO%d: %d\n",
 623                         id + 1, ret);
 624                 goto err;
 625         }
 626
 627         irq = platform_get_irq_byname(pdev, "UV");
 628         ret = request_threaded_irq(irq, NULL, wm831x_ldo_uv_irq,
 629                                    IRQF_TRIGGER_RISING, ldo->name, ldo);
 630         if (ret != 0) {
 631                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
 632                         irq, ret);
 633                 goto err_regulator;
 634         }
 635
 636         platform_set_drvdata(pdev, ldo);
 637
 638         return 0;
 639
 640 err_regulator:
 641         regulator_unregister(ldo->regulator);
 642 err:
 643         return ret;
 644 }
 645
 646 static __devexit int wm831x_aldo_remove(struct platform_device *pdev)
 647 {
 648         struct wm831x_ldo *ldo = platform_get_drvdata(pdev);
 649
 650         free_irq(platform_get_irq_byname(pdev, "UV"), ldo);
 651         regulator_unregister(ldo->regulator);
 652
 653         return 0;
 654 }
 655
 656 static struct platform_driver wm831x_aldo_driver = {
 657         .probe = wm831x_aldo_probe,
 658         .remove = __devexit_p(wm831x_aldo_remove),
 659         .driver         = {
 660                 .name   = "wm831x-aldo",
 661                 .owner  = THIS_MODULE,
 662         },
 663 };
 664
 665 /*
 666  * Alive LDO
 667  */
 668
 669 #define WM831X_ALIVE_LDO_MAX_SELECTOR 0xf
 670
 671 static int wm831x_alive_ldo_list_voltage(struct regulator_dev *rdev,
 672                                       unsigned int selector)
 673 {
 674         /* 0.8-1.55V in 50mV steps */
 675         if (selector <= WM831X_ALIVE_LDO_MAX_SELECTOR)
 676                 return 800000 + (selector * 50000);
 677         return -EINVAL;
 678 }
 679
 680 static int wm831x_alive_ldo_set_voltage_int(struct regulator_dev *rdev,
 681                                             int reg,
 682                                             int min_uV, int max_uV,
 683                                             unsigned *selector)
 684 {
 685         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 686         struct wm831x *wm831x = ldo->wm831x;
 687         int vsel, ret;
 688
 689         vsel = (min_uV - 800000) / 50000;
 690
 691         ret = wm831x_alive_ldo_list_voltage(rdev, vsel);
 692         if (ret < 0)
 693                 return ret;
 694         if (ret < min_uV || ret > max_uV)
 695                 return -EINVAL;
 696
 697         *selector = vsel;
 698
 699         return wm831x_set_bits(wm831x, reg, WM831X_LDO11_ON_VSEL_MASK, vsel);
 700 }
 701
 702 static int wm831x_alive_ldo_set_voltage(struct regulator_dev *rdev,
 703                                         int min_uV, int max_uV,
 704                                         unsigned *selector)
 705 {
 706         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 707         int reg = ldo->base + WM831X_ALIVE_LDO_ON_CONTROL;
 708
 709         return wm831x_alive_ldo_set_voltage_int(rdev, reg, min_uV, max_uV,
 710                                                 selector);
 711 }
 712
 713 static int wm831x_alive_ldo_set_suspend_voltage(struct regulator_dev *rdev,
 714                                              int uV)
 715 {
 716         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 717         int reg = ldo->base + WM831X_ALIVE_LDO_SLEEP_CONTROL;
 718         unsigned selector;
 719
 720         return wm831x_alive_ldo_set_voltage_int(rdev, reg, uV, uV, &selector);
 721 }
 722
 723 static int wm831x_alive_ldo_get_voltage_sel(struct regulator_dev *rdev)
 724 {
 725         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 726         struct wm831x *wm831x = ldo->wm831x;
 727         int reg = ldo->base + WM831X_ALIVE_LDO_ON_CONTROL;
 728         int ret;
 729
 730         ret = wm831x_reg_read(wm831x, reg);
 731         if (ret < 0)
 732                 return ret;
 733
 734         ret &= WM831X_LDO11_ON_VSEL_MASK;
 735
 736         return ret;
 737 }
 738
 739 static int wm831x_alive_ldo_get_status(struct regulator_dev *rdev)
 740 {
 741         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 742         struct wm831x *wm831x = ldo->wm831x;
 743         int mask = 1 << rdev_get_id(rdev);
 744         int ret;
 745
 746         /* Is the regulator on? */
 747         ret = wm831x_reg_read(wm831x, WM831X_LDO_STATUS);
 748         if (ret < 0)
 749                 return ret;
 750         if (ret & mask)
 751                 return REGULATOR_STATUS_ON;
 752         else
 753                 return REGULATOR_STATUS_OFF;
 754 }
 755
 756 static struct regulator_ops wm831x_alive_ldo_ops = {
 757         .list_voltage = wm831x_alive_ldo_list_voltage,
 758         .get_voltage_sel = wm831x_alive_ldo_get_voltage_sel,
 759         .set_voltage = wm831x_alive_ldo_set_voltage,
 760         .set_suspend_voltage = wm831x_alive_ldo_set_suspend_voltage,
 761         .get_status = wm831x_alive_ldo_get_status,
 762
 763         .is_enabled = wm831x_ldo_is_enabled,
 764         .enable = wm831x_ldo_enable,
 765         .disable = wm831x_ldo_disable,
 766 };
 767
 768 static __devinit int wm831x_alive_ldo_probe(struct platform_device *pdev)
 769 {
 770         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 771         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
 772         int id;
 773         struct wm831x_ldo *ldo;
 774         struct resource *res;
 775         int ret;
 776
 777         if (pdata && pdata->wm831x_num)
 778                 id = (pdata->wm831x_num * 10) + 1;
 779         else
 780                 id = 0;
 781         id = pdev->id - id;
 782
 783
 784         dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
 785
 786         if (pdata == NULL || pdata->ldo[id] == NULL)
 787                 return -ENODEV;
 788
 789         ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ldo), GFP_KERNEL);
 790         if (ldo == NULL) {
 791                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 792                 return -ENOMEM;
 793         }
 794
 795         ldo->wm831x = wm831x;
 796
 797         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 798         if (res == NULL) {
 799                 dev_err(&pdev->dev, "No I/O resource\n");
 800                 ret = -EINVAL;
 801                 goto err;
 802         }
 803         ldo->base = res->start;
 804
 805         snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1);
 806         ldo->desc.name = ldo->name;
 807         ldo->desc.id = id;
 808         ldo->desc.type = REGULATOR_VOLTAGE;
 809         ldo->desc.n_voltages = WM831X_ALIVE_LDO_MAX_SELECTOR + 1;
 810         ldo->desc.ops = &wm831x_alive_ldo_ops;
 811         ldo->desc.owner = THIS_MODULE;
 812
 813         ldo->regulator = regulator_register(&ldo->desc, &pdev->dev,
 814                                              pdata->ldo[id], ldo, NULL);
 815         if (IS_ERR(ldo->regulator)) {
 816                 ret = PTR_ERR(ldo->regulator);
 817                 dev_err(wm831x->dev, "Failed to register LDO%d: %d\n",
 818                         id + 1, ret);
 819                 goto err;
 820         }
 821
 822         platform_set_drvdata(pdev, ldo);
 823
 824         return 0;
 825
 826 err:
 827         return ret;
 828 }
 829
 830 static __devexit int wm831x_alive_ldo_remove(struct platform_device *pdev)
 831 {
 832         struct wm831x_ldo *ldo = platform_get_drvdata(pdev);
 833
 834         regulator_unregister(ldo->regulator);
 835
 836         return 0;
 837 }
 838
 839 static struct platform_driver wm831x_alive_ldo_driver = {
 840         .probe = wm831x_alive_ldo_probe,
 841         .remove = __devexit_p(wm831x_alive_ldo_remove),
 842         .driver         = {
 843                 .name   = "wm831x-alive-ldo",
 844                 .owner  = THIS_MODULE,
 845         },
 846 };
 847
 848 static int __init wm831x_ldo_init(void)
 849 {
 850         int ret;
 851
 852         ret = platform_driver_register(&wm831x_gp_ldo_driver);
 853         if (ret != 0)
 854                 pr_err("Failed to register WM831x GP LDO driver: %d\n", ret);
 855
 856         ret = platform_driver_register(&wm831x_aldo_driver);
 857         if (ret != 0)
 858                 pr_err("Failed to register WM831x ALDO driver: %d\n", ret);
 859
 860         ret = platform_driver_register(&wm831x_alive_ldo_driver);
 861         if (ret != 0)
 862                 pr_err("Failed to register WM831x alive LDO driver: %d\n",
 863                        ret);
 864
 865         return 0;
 866 }
 867 subsys_initcall(wm831x_ldo_init);
 868
 869 static void __exit wm831x_ldo_exit(void)
 870 {
 871         platform_driver_unregister(&wm831x_alive_ldo_driver);
 872         platform_driver_unregister(&wm831x_aldo_driver);
 873         platform_driver_unregister(&wm831x_gp_ldo_driver);
 874 }
 875 module_exit(wm831x_ldo_exit);
 876
 877 /* Module information */
 878 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 879 MODULE_DESCRIPTION("WM831x LDO driver");
 880 MODULE_LICENSE("GPL");
 881 MODULE_ALIAS("platform:wm831x-ldo");
 882 MODULE_ALIAS("platform:wm831x-aldo");
 883 MODULE_ALIAS("platform:wm831x-aliveldo");