drivers/regulator/wm831x-dcdc.c

   1 /*
   2  * wm831x-dcdc.c  --  DC-DC buck convertor 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
  23 #include <linux/mfd/wm831x/core.h>
  24 #include <linux/mfd/wm831x/regulator.h>
  25 #include <linux/mfd/wm831x/pdata.h>
  26
  27 #define WM831X_BUCKV_MAX_SELECTOR 0x68
  28 #define WM831X_BUCKP_MAX_SELECTOR 0x66
  29
  30 #define WM831X_DCDC_MODE_FAST    0
  31 #define WM831X_DCDC_MODE_NORMAL  1
  32 #define WM831X_DCDC_MODE_IDLE    2
  33 #define WM831X_DCDC_MODE_STANDBY 3
  34
  35 #define WM831X_DCDC_MAX_NAME 6
  36
  37 /* Register offsets in control block */
  38 #define WM831X_DCDC_CONTROL_1     0
  39 #define WM831X_DCDC_CONTROL_2     1
  40 #define WM831X_DCDC_ON_CONFIG     2
  41 #define WM831X_DCDC_SLEEP_CONTROL 3
  42
  43 /*
  44  * Shared
  45  */
  46
  47 struct wm831x_dcdc {
  48         char name[WM831X_DCDC_MAX_NAME];
  49         struct regulator_desc desc;
  50         int base;
  51         struct wm831x *wm831x;
  52         struct regulator_dev *regulator;
  53 };
  54
  55 static int wm831x_dcdc_is_enabled(struct regulator_dev *rdev)
  56 {
  57         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
  58         struct wm831x *wm831x = dcdc->wm831x;
  59         int mask = 1 << rdev_get_id(rdev);
  60         int reg;
  61
  62         reg = wm831x_reg_read(wm831x, WM831X_DCDC_ENABLE);
  63         if (reg < 0)
  64                 return reg;
  65
  66         if (reg & mask)
  67                 return 1;
  68         else
  69                 return 0;
  70 }
  71
  72 static int wm831x_dcdc_enable(struct regulator_dev *rdev)
  73 {
  74         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
  75         struct wm831x *wm831x = dcdc->wm831x;
  76         int mask = 1 << rdev_get_id(rdev);
  77
  78         return wm831x_set_bits(wm831x, WM831X_DCDC_ENABLE, mask, mask);
  79 }
  80
  81 static int wm831x_dcdc_disable(struct regulator_dev *rdev)
  82 {
  83         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
  84         struct wm831x *wm831x = dcdc->wm831x;
  85         int mask = 1 << rdev_get_id(rdev);
  86
  87         return wm831x_set_bits(wm831x, WM831X_DCDC_ENABLE, mask, 0);
  88 }
  89
  90 static unsigned int wm831x_dcdc_get_mode(struct regulator_dev *rdev)
  91
  92 {
  93         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
  94         struct wm831x *wm831x = dcdc->wm831x;
  95         u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
  96         int val;
  97
  98         val = wm831x_reg_read(wm831x, reg);
  99         if (val < 0)
 100                 return val;
 101
 102         val = (val & WM831X_DC1_ON_MODE_MASK) >> WM831X_DC1_ON_MODE_SHIFT;
 103
 104         switch (val) {
 105         case WM831X_DCDC_MODE_FAST:
 106                 return REGULATOR_MODE_FAST;
 107         case WM831X_DCDC_MODE_NORMAL:
 108                 return REGULATOR_MODE_NORMAL;
 109         case WM831X_DCDC_MODE_STANDBY:
 110                 return REGULATOR_MODE_STANDBY;
 111         case WM831X_DCDC_MODE_IDLE:
 112                 return REGULATOR_MODE_IDLE;
 113         default:
 114                 BUG();
 115         }
 116 }
 117
 118 static int wm831x_dcdc_set_mode_int(struct wm831x *wm831x, int reg,
 119                                     unsigned int mode)
 120 {
 121         int val;
 122
 123         switch (mode) {
 124         case REGULATOR_MODE_FAST:
 125                 val = WM831X_DCDC_MODE_FAST;
 126                 break;
 127         case REGULATOR_MODE_NORMAL:
 128                 val = WM831X_DCDC_MODE_NORMAL;
 129                 break;
 130         case REGULATOR_MODE_STANDBY:
 131                 val = WM831X_DCDC_MODE_STANDBY;
 132                 break;
 133         case REGULATOR_MODE_IDLE:
 134                 val = WM831X_DCDC_MODE_IDLE;
 135                 break;
 136         default:
 137                 return -EINVAL;
 138         }
 139
 140         return wm831x_set_bits(wm831x, reg, WM831X_DC1_ON_MODE_MASK,
 141                                val << WM831X_DC1_ON_MODE_SHIFT);
 142 }
 143
 144 static int wm831x_dcdc_set_mode(struct regulator_dev *rdev, unsigned int mode)
 145 {
 146         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 147         struct wm831x *wm831x = dcdc->wm831x;
 148         u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
 149
 150         return wm831x_dcdc_set_mode_int(wm831x, reg, mode);
 151 }
 152
 153 static int wm831x_dcdc_set_suspend_mode(struct regulator_dev *rdev,
 154                                         unsigned int mode)
 155 {
 156         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 157         struct wm831x *wm831x = dcdc->wm831x;
 158         u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
 159
 160         return wm831x_dcdc_set_mode_int(wm831x, reg, mode);
 161 }
 162
 163 static int wm831x_dcdc_get_status(struct regulator_dev *rdev)
 164 {
 165         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 166         struct wm831x *wm831x = dcdc->wm831x;
 167         int ret;
 168
 169         /* First, check for errors */
 170         ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
 171         if (ret < 0)
 172                 return ret;
 173
 174         if (ret & (1 << rdev_get_id(rdev))) {
 175                 dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
 176                         rdev_get_id(rdev) + 1);
 177                 return REGULATOR_STATUS_ERROR;
 178         }
 179
 180         /* DCDC1 and DCDC2 can additionally detect high voltage/current */
 181         if (rdev_get_id(rdev) < 2) {
 182                 if (ret & (WM831X_DC1_OV_STS << rdev_get_id(rdev))) {
 183                         dev_dbg(wm831x->dev, "DCDC%d over voltage\n",
 184                                 rdev_get_id(rdev) + 1);
 185                         return REGULATOR_STATUS_ERROR;
 186                 }
 187
 188                 if (ret & (WM831X_DC1_HC_STS << rdev_get_id(rdev))) {
 189                         dev_dbg(wm831x->dev, "DCDC%d over current\n",
 190                                 rdev_get_id(rdev) + 1);
 191                         return REGULATOR_STATUS_ERROR;
 192                 }
 193         }
 194
 195         /* Is the regulator on? */
 196         ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
 197         if (ret < 0)
 198                 return ret;
 199         if (!(ret & (1 << rdev_get_id(rdev))))
 200                 return REGULATOR_STATUS_OFF;
 201
 202         /* TODO: When we handle hardware control modes so we can report the
 203          * current mode. */
 204         return REGULATOR_STATUS_ON;
 205 }
 206
 207 static irqreturn_t wm831x_dcdc_uv_irq(int irq, void *data)
 208 {
 209         struct wm831x_dcdc *dcdc = data;
 210
 211         regulator_notifier_call_chain(dcdc->regulator,
 212                                       REGULATOR_EVENT_UNDER_VOLTAGE,
 213                                       NULL);
 214
 215         return IRQ_HANDLED;
 216 }
 217
 218 static irqreturn_t wm831x_dcdc_oc_irq(int irq, void *data)
 219 {
 220         struct wm831x_dcdc *dcdc = data;
 221
 222         regulator_notifier_call_chain(dcdc->regulator,
 223                                       REGULATOR_EVENT_OVER_CURRENT,
 224                                       NULL);
 225
 226         return IRQ_HANDLED;
 227 }
 228
 229 /*
 230  * BUCKV specifics
 231  */
 232
 233 static int wm831x_buckv_list_voltage(struct regulator_dev *rdev,
 234                                       unsigned selector)
 235 {
 236         if (selector <= 0x8)
 237                 return 600000;
 238         if (selector <= WM831X_BUCKV_MAX_SELECTOR)
 239                 return 600000 + ((selector - 0x8) * 12500);
 240         return -EINVAL;
 241 }
 242
 243 static int wm831x_buckv_set_voltage_int(struct regulator_dev *rdev, int reg,
 244                                          int min_uV, int max_uV)
 245 {
 246         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 247         struct wm831x *wm831x = dcdc->wm831x;
 248         u16 vsel;
 249
 250         if (min_uV < 600000)
 251                 vsel = 0;
 252         else if (min_uV <= 1800000)
 253                 vsel = ((min_uV - 600000) / 12500) + 8;
 254         else
 255                 return -EINVAL;
 256
 257         if (wm831x_buckv_list_voltage(rdev, vsel) > max_uV)
 258                 return -EINVAL;
 259
 260         return wm831x_set_bits(wm831x, reg, WM831X_DC1_ON_VSEL_MASK, vsel);
 261 }
 262
 263 static int wm831x_buckv_set_voltage(struct regulator_dev *rdev,
 264                                      int min_uV, int max_uV)
 265 {
 266         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 267         u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
 268
 269         return wm831x_buckv_set_voltage_int(rdev, reg, min_uV, max_uV);
 270 }
 271
 272 static int wm831x_buckv_set_suspend_voltage(struct regulator_dev *rdev,
 273                                              int uV)
 274 {
 275         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 276         u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
 277
 278         return wm831x_buckv_set_voltage_int(rdev, reg, uV, uV);
 279 }
 280
 281 static int wm831x_buckv_get_voltage(struct regulator_dev *rdev)
 282 {
 283         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 284         struct wm831x *wm831x = dcdc->wm831x;
 285         u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
 286         int val;
 287
 288         val = wm831x_reg_read(wm831x, reg);
 289         if (val < 0)
 290                 return val;
 291
 292         return wm831x_buckv_list_voltage(rdev, val & WM831X_DC1_ON_VSEL_MASK);
 293 }
 294
 295 /* Current limit options */
 296 static u16 wm831x_dcdc_ilim[] = {
 297         125, 250, 375, 500, 625, 750, 875, 1000
 298 };
 299
 300 static int wm831x_buckv_set_current_limit(struct regulator_dev *rdev,
 301                                            int min_uA, int max_uA)
 302 {
 303         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 304         struct wm831x *wm831x = dcdc->wm831x;
 305         u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2;
 306         int i;
 307
 308         for (i = 0; i < ARRAY_SIZE(wm831x_dcdc_ilim); i++) {
 309                 if (max_uA <= wm831x_dcdc_ilim[i])
 310                         break;
 311         }
 312         if (i == ARRAY_SIZE(wm831x_dcdc_ilim))
 313                 return -EINVAL;
 314
 315         return wm831x_set_bits(wm831x, reg, WM831X_DC1_HC_THR_MASK, i);
 316 }
 317
 318 static int wm831x_buckv_get_current_limit(struct regulator_dev *rdev)
 319 {
 320         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 321         struct wm831x *wm831x = dcdc->wm831x;
 322         u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2;
 323         int val;
 324
 325         val = wm831x_reg_read(wm831x, reg);
 326         if (val < 0)
 327                 return val;
 328
 329         return wm831x_dcdc_ilim[val & WM831X_DC1_HC_THR_MASK];
 330 }
 331
 332 static struct regulator_ops wm831x_buckv_ops = {
 333         .set_voltage = wm831x_buckv_set_voltage,
 334         .get_voltage = wm831x_buckv_get_voltage,
 335         .list_voltage = wm831x_buckv_list_voltage,
 336         .set_suspend_voltage = wm831x_buckv_set_suspend_voltage,
 337         .set_current_limit = wm831x_buckv_set_current_limit,
 338         .get_current_limit = wm831x_buckv_get_current_limit,
 339
 340         .is_enabled = wm831x_dcdc_is_enabled,
 341         .enable = wm831x_dcdc_enable,
 342         .disable = wm831x_dcdc_disable,
 343         .get_status = wm831x_dcdc_get_status,
 344         .get_mode = wm831x_dcdc_get_mode,
 345         .set_mode = wm831x_dcdc_set_mode,
 346         .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
 347 };
 348
 349 static __devinit int wm831x_buckv_probe(struct platform_device *pdev)
 350 {
 351         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 352         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
 353         int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
 354         struct wm831x_dcdc *dcdc;
 355         struct resource *res;
 356         int ret, irq;
 357
 358         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
 359
 360         if (pdata == NULL || pdata->dcdc[id] == NULL)
 361                 return -ENODEV;
 362
 363         dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
 364         if (dcdc == NULL) {
 365                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 366                 return -ENOMEM;
 367         }
 368
 369         dcdc->wm831x = wm831x;
 370
 371         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 372         if (res == NULL) {
 373                 dev_err(&pdev->dev, "No I/O resource\n");
 374                 ret = -EINVAL;
 375                 goto err;
 376         }
 377         dcdc->base = res->start;
 378
 379         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
 380         dcdc->desc.name = dcdc->name;
 381         dcdc->desc.id = id;
 382         dcdc->desc.type = REGULATOR_VOLTAGE;
 383         dcdc->desc.n_voltages = WM831X_BUCKV_MAX_SELECTOR + 1;
 384         dcdc->desc.ops = &wm831x_buckv_ops;
 385         dcdc->desc.owner = THIS_MODULE;
 386
 387         dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
 388                                              pdata->dcdc[id], dcdc);
 389         if (IS_ERR(dcdc->regulator)) {
 390                 ret = PTR_ERR(dcdc->regulator);
 391                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
 392                         id + 1, ret);
 393                 goto err;
 394         }
 395
 396         irq = platform_get_irq_byname(pdev, "UV");
 397         ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_uv_irq,
 398                                  IRQF_TRIGGER_RISING, dcdc->name,
 399                                  dcdc);
 400         if (ret != 0) {
 401                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
 402                         irq, ret);
 403                 goto err_regulator;
 404         }
 405
 406         irq = platform_get_irq_byname(pdev, "HC");
 407         ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_oc_irq,
 408                                  IRQF_TRIGGER_RISING, dcdc->name,
 409                                  dcdc);
 410         if (ret != 0) {
 411                 dev_err(&pdev->dev, "Failed to request HC IRQ %d: %d\n",
 412                         irq, ret);
 413                 goto err_uv;
 414         }
 415
 416         platform_set_drvdata(pdev, dcdc);
 417
 418         return 0;
 419
 420 err_uv:
 421         wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc);
 422 err_regulator:
 423         regulator_unregister(dcdc->regulator);
 424 err:
 425         kfree(dcdc);
 426         return ret;
 427 }
 428
 429 static __devexit int wm831x_buckv_remove(struct platform_device *pdev)
 430 {
 431         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
 432         struct wm831x *wm831x = dcdc->wm831x;
 433
 434         wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "HC"), dcdc);
 435         wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc);
 436         regulator_unregister(dcdc->regulator);
 437         kfree(dcdc);
 438
 439         return 0;
 440 }
 441
 442 static struct platform_driver wm831x_buckv_driver = {
 443         .probe = wm831x_buckv_probe,
 444         .remove = __devexit_p(wm831x_buckv_remove),
 445         .driver         = {
 446                 .name   = "wm831x-buckv",
 447         },
 448 };
 449
 450 /*
 451  * BUCKP specifics
 452  */
 453
 454 static int wm831x_buckp_list_voltage(struct regulator_dev *rdev,
 455                                       unsigned selector)
 456 {
 457         if (selector <= WM831X_BUCKP_MAX_SELECTOR)
 458                 return 850000 + (selector * 25000);
 459         else
 460                 return -EINVAL;
 461 }
 462
 463 static int wm831x_buckp_set_voltage_int(struct regulator_dev *rdev, int reg,
 464                                         int min_uV, int max_uV)
 465 {
 466         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 467         struct wm831x *wm831x = dcdc->wm831x;
 468         u16 vsel;
 469
 470         if (min_uV <= 34000000)
 471                 vsel = (min_uV - 850000) / 25000;
 472         else
 473                 return -EINVAL;
 474
 475         if (wm831x_buckp_list_voltage(rdev, vsel) > max_uV)
 476                 return -EINVAL;
 477
 478         return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, vsel);
 479 }
 480
 481 static int wm831x_buckp_set_voltage(struct regulator_dev *rdev,
 482                                     int min_uV, int max_uV)
 483 {
 484         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 485         u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
 486
 487         return wm831x_buckp_set_voltage_int(rdev, reg, min_uV, max_uV);
 488 }
 489
 490 static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev,
 491                                             int uV)
 492 {
 493         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 494         u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
 495
 496         return wm831x_buckp_set_voltage_int(rdev, reg, uV, uV);
 497 }
 498
 499 static int wm831x_buckp_get_voltage(struct regulator_dev *rdev)
 500 {
 501         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 502         struct wm831x *wm831x = dcdc->wm831x;
 503         u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
 504         int val;
 505
 506         val = wm831x_reg_read(wm831x, reg);
 507         if (val < 0)
 508                 return val;
 509
 510         return wm831x_buckp_list_voltage(rdev, val & WM831X_DC3_ON_VSEL_MASK);
 511 }
 512
 513 static struct regulator_ops wm831x_buckp_ops = {
 514         .set_voltage = wm831x_buckp_set_voltage,
 515         .get_voltage = wm831x_buckp_get_voltage,
 516         .list_voltage = wm831x_buckp_list_voltage,
 517         .set_suspend_voltage = wm831x_buckp_set_suspend_voltage,
 518
 519         .is_enabled = wm831x_dcdc_is_enabled,
 520         .enable = wm831x_dcdc_enable,
 521         .disable = wm831x_dcdc_disable,
 522         .get_status = wm831x_dcdc_get_status,
 523         .get_mode = wm831x_dcdc_get_mode,
 524         .set_mode = wm831x_dcdc_set_mode,
 525         .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
 526 };
 527
 528 static __devinit int wm831x_buckp_probe(struct platform_device *pdev)
 529 {
 530         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 531         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
 532         int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
 533         struct wm831x_dcdc *dcdc;
 534         struct resource *res;
 535         int ret, irq;
 536
 537         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
 538
 539         if (pdata == NULL || pdata->dcdc[id] == NULL)
 540                 return -ENODEV;
 541
 542         dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
 543         if (dcdc == NULL) {
 544                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 545                 return -ENOMEM;
 546         }
 547
 548         dcdc->wm831x = wm831x;
 549
 550         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 551         if (res == NULL) {
 552                 dev_err(&pdev->dev, "No I/O resource\n");
 553                 ret = -EINVAL;
 554                 goto err;
 555         }
 556         dcdc->base = res->start;
 557
 558         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
 559         dcdc->desc.name = dcdc->name;
 560         dcdc->desc.id = id;
 561         dcdc->desc.type = REGULATOR_VOLTAGE;
 562         dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1;
 563         dcdc->desc.ops = &wm831x_buckp_ops;
 564         dcdc->desc.owner = THIS_MODULE;
 565
 566         dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
 567                                              pdata->dcdc[id], dcdc);
 568         if (IS_ERR(dcdc->regulator)) {
 569                 ret = PTR_ERR(dcdc->regulator);
 570                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
 571                         id + 1, ret);
 572                 goto err;
 573         }
 574
 575         irq = platform_get_irq_byname(pdev, "UV");
 576         ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_uv_irq,
 577                                  IRQF_TRIGGER_RISING, dcdc->name,
 578                                  dcdc);
 579         if (ret != 0) {
 580                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
 581                         irq, ret);
 582                 goto err_regulator;
 583         }
 584
 585         platform_set_drvdata(pdev, dcdc);
 586
 587         return 0;
 588
 589 err_regulator:
 590         regulator_unregister(dcdc->regulator);
 591 err:
 592         kfree(dcdc);
 593         return ret;
 594 }
 595
 596 static __devexit int wm831x_buckp_remove(struct platform_device *pdev)
 597 {
 598         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
 599         struct wm831x *wm831x = dcdc->wm831x;
 600
 601         wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc);
 602         regulator_unregister(dcdc->regulator);
 603         kfree(dcdc);
 604
 605         return 0;
 606 }
 607
 608 static struct platform_driver wm831x_buckp_driver = {
 609         .probe = wm831x_buckp_probe,
 610         .remove = __devexit_p(wm831x_buckp_remove),
 611         .driver         = {
 612                 .name   = "wm831x-buckp",
 613         },
 614 };
 615
 616 /*
 617  * DCDC boost convertors
 618  */
 619
 620 static int wm831x_boostp_get_status(struct regulator_dev *rdev)
 621 {
 622         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 623         struct wm831x *wm831x = dcdc->wm831x;
 624         int ret;
 625
 626         /* First, check for errors */
 627         ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
 628         if (ret < 0)
 629                 return ret;
 630
 631         if (ret & (1 << rdev_get_id(rdev))) {
 632                 dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
 633                         rdev_get_id(rdev) + 1);
 634                 return REGULATOR_STATUS_ERROR;
 635         }
 636
 637         /* Is the regulator on? */
 638         ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
 639         if (ret < 0)
 640                 return ret;
 641         if (ret & (1 << rdev_get_id(rdev)))
 642                 return REGULATOR_STATUS_ON;
 643         else
 644                 return REGULATOR_STATUS_OFF;
 645 }
 646
 647 static struct regulator_ops wm831x_boostp_ops = {
 648         .get_status = wm831x_boostp_get_status,
 649
 650         .is_enabled = wm831x_dcdc_is_enabled,
 651         .enable = wm831x_dcdc_enable,
 652         .disable = wm831x_dcdc_disable,
 653 };
 654
 655 static __devinit int wm831x_boostp_probe(struct platform_device *pdev)
 656 {
 657         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 658         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
 659         int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
 660         struct wm831x_dcdc *dcdc;
 661         struct resource *res;
 662         int ret, irq;
 663
 664         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
 665
 666         if (pdata == NULL || pdata->dcdc[id] == NULL)
 667                 return -ENODEV;
 668
 669         dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
 670         if (dcdc == NULL) {
 671                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 672                 return -ENOMEM;
 673         }
 674
 675         dcdc->wm831x = wm831x;
 676
 677         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 678         if (res == NULL) {
 679                 dev_err(&pdev->dev, "No I/O resource\n");
 680                 ret = -EINVAL;
 681                 goto err;
 682         }
 683         dcdc->base = res->start;
 684
 685         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
 686         dcdc->desc.name = dcdc->name;
 687         dcdc->desc.id = id;
 688         dcdc->desc.type = REGULATOR_VOLTAGE;
 689         dcdc->desc.ops = &wm831x_boostp_ops;
 690         dcdc->desc.owner = THIS_MODULE;
 691
 692         dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
 693                                              pdata->dcdc[id], dcdc);
 694         if (IS_ERR(dcdc->regulator)) {
 695                 ret = PTR_ERR(dcdc->regulator);
 696                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
 697                         id + 1, ret);
 698                 goto err;
 699         }
 700
 701         irq = platform_get_irq_byname(pdev, "UV");
 702         ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_uv_irq,
 703                                  IRQF_TRIGGER_RISING, dcdc->name,
 704                                  dcdc);
 705         if (ret != 0) {
 706                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
 707                         irq, ret);
 708                 goto err_regulator;
 709         }
 710
 711         platform_set_drvdata(pdev, dcdc);
 712
 713         return 0;
 714
 715 err_regulator:
 716         regulator_unregister(dcdc->regulator);
 717 err:
 718         kfree(dcdc);
 719         return ret;
 720 }
 721
 722 static __devexit int wm831x_boostp_remove(struct platform_device *pdev)
 723 {
 724         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
 725         struct wm831x *wm831x = dcdc->wm831x;
 726
 727         wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc);
 728         regulator_unregister(dcdc->regulator);
 729         kfree(dcdc);
 730
 731         return 0;
 732 }
 733
 734 static struct platform_driver wm831x_boostp_driver = {
 735         .probe = wm831x_boostp_probe,
 736         .remove = __devexit_p(wm831x_boostp_remove),
 737         .driver         = {
 738                 .name   = "wm831x-boostp",
 739         },
 740 };
 741
 742 /*
 743  * External Power Enable
 744  *
 745  * These aren't actually DCDCs but look like them in hardware so share
 746  * code.
 747  */
 748
 749 #define WM831X_EPE_BASE 6
 750
 751 static struct regulator_ops wm831x_epe_ops = {
 752         .is_enabled = wm831x_dcdc_is_enabled,
 753         .enable = wm831x_dcdc_enable,
 754         .disable = wm831x_dcdc_disable,
 755         .get_status = wm831x_dcdc_get_status,
 756 };
 757
 758 static __devinit int wm831x_epe_probe(struct platform_device *pdev)
 759 {
 760         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 761         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
 762         int id = pdev->id % ARRAY_SIZE(pdata->epe);
 763         struct wm831x_dcdc *dcdc;
 764         int ret;
 765
 766         dev_dbg(&pdev->dev, "Probing EPE%d\n", id + 1);
 767
 768         if (pdata == NULL || pdata->epe[id] == NULL)
 769                 return -ENODEV;
 770
 771         dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
 772         if (dcdc == NULL) {
 773                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 774                 return -ENOMEM;
 775         }
 776
 777         dcdc->wm831x = wm831x;
 778
 779         /* For current parts this is correct; probably need to revisit
 780          * in future.
 781          */
 782         snprintf(dcdc->name, sizeof(dcdc->name), "EPE%d", id + 1);
 783         dcdc->desc.name = dcdc->name;
 784         dcdc->desc.id = id + WM831X_EPE_BASE; /* Offset in DCDC registers */
 785         dcdc->desc.ops = &wm831x_epe_ops;
 786         dcdc->desc.type = REGULATOR_VOLTAGE;
 787         dcdc->desc.owner = THIS_MODULE;
 788
 789         dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
 790                                              pdata->epe[id], dcdc);
 791         if (IS_ERR(dcdc->regulator)) {
 792                 ret = PTR_ERR(dcdc->regulator);
 793                 dev_err(wm831x->dev, "Failed to register EPE%d: %d\n",
 794                         id + 1, ret);
 795                 goto err;
 796         }
 797
 798         platform_set_drvdata(pdev, dcdc);
 799
 800         return 0;
 801
 802 err:
 803         kfree(dcdc);
 804         return ret;
 805 }
 806
 807 static __devexit int wm831x_epe_remove(struct platform_device *pdev)
 808 {
 809         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
 810
 811         regulator_unregister(dcdc->regulator);
 812         kfree(dcdc);
 813
 814         return 0;
 815 }
 816
 817 static struct platform_driver wm831x_epe_driver = {
 818         .probe = wm831x_epe_probe,
 819         .remove = __devexit_p(wm831x_epe_remove),
 820         .driver         = {
 821                 .name   = "wm831x-epe",
 822         },
 823 };
 824
 825 static int __init wm831x_dcdc_init(void)
 826 {
 827         int ret;
 828         ret = platform_driver_register(&wm831x_buckv_driver);
 829         if (ret != 0)
 830                 pr_err("Failed to register WM831x BUCKV driver: %d\n", ret);
 831
 832         ret = platform_driver_register(&wm831x_buckp_driver);
 833         if (ret != 0)
 834                 pr_err("Failed to register WM831x BUCKP driver: %d\n", ret);
 835
 836         ret = platform_driver_register(&wm831x_boostp_driver);
 837         if (ret != 0)
 838                 pr_err("Failed to register WM831x BOOST driver: %d\n", ret);
 839
 840         ret = platform_driver_register(&wm831x_epe_driver);
 841         if (ret != 0)
 842                 pr_err("Failed to register WM831x EPE driver: %d\n", ret);
 843
 844         return 0;
 845 }
 846 subsys_initcall(wm831x_dcdc_init);
 847
 848 static void __exit wm831x_dcdc_exit(void)
 849 {
 850         platform_driver_unregister(&wm831x_epe_driver);
 851         platform_driver_unregister(&wm831x_boostp_driver);
 852         platform_driver_unregister(&wm831x_buckp_driver);
 853         platform_driver_unregister(&wm831x_buckv_driver);
 854 }
 855 module_exit(wm831x_dcdc_exit);
 856
 857 /* Module information */
 858 MODULE_AUTHOR("Mark Brown");
 859 MODULE_DESCRIPTION("WM831x DC-DC convertor driver");
 860 MODULE_LICENSE("GPL");
 861 MODULE_ALIAS("platform:wm831x-buckv");
 862 MODULE_ALIAS("platform:wm831x-buckp");