Pileus Git - ~andy/linux/blob - 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 #include <linux/regulator/machine.h>
  23 #include <linux/gpio.h>
  24 #include <linux/slab.h>
  25
  26 #include <linux/mfd/wm831x/core.h>
  27 #include <linux/mfd/wm831x/regulator.h>
  28 #include <linux/mfd/wm831x/pdata.h>
  29
  30 #define WM831X_BUCKV_MAX_SELECTOR 0x68
  31 #define WM831X_BUCKP_MAX_SELECTOR 0x66
  32
  33 #define WM831X_DCDC_MODE_FAST    0
  34 #define WM831X_DCDC_MODE_NORMAL  1
  35 #define WM831X_DCDC_MODE_IDLE    2
  36 #define WM831X_DCDC_MODE_STANDBY 3
  37
  38 #define WM831X_DCDC_MAX_NAME 6
  39
  40 /* Register offsets in control block */
  41 #define WM831X_DCDC_CONTROL_1     0
  42 #define WM831X_DCDC_CONTROL_2     1
  43 #define WM831X_DCDC_ON_CONFIG     2
  44 #define WM831X_DCDC_SLEEP_CONTROL 3
  45 #define WM831X_DCDC_DVS_CONTROL   4
  46
  47 /*
  48  * Shared
  49  */
  50
  51 struct wm831x_dcdc {
  52         char name[WM831X_DCDC_MAX_NAME];
  53         struct regulator_desc desc;
  54         int base;
  55         struct wm831x *wm831x;
  56         struct regulator_dev *regulator;
  57         int dvs_gpio;
  58         int dvs_gpio_state;
  59         int on_vsel;
  60         int dvs_vsel;
  61 };
  62
  63 static int wm831x_dcdc_is_enabled(struct regulator_dev *rdev)
  64 {
  65         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
  66         struct wm831x *wm831x = dcdc->wm831x;
  67         int mask = 1 << rdev_get_id(rdev);
  68         int reg;
  69
  70         reg = wm831x_reg_read(wm831x, WM831X_DCDC_ENABLE);
  71         if (reg < 0)
  72                 return reg;
  73
  74         if (reg & mask)
  75                 return 1;
  76         else
  77                 return 0;
  78 }
  79
  80 static int wm831x_dcdc_enable(struct regulator_dev *rdev)
  81 {
  82         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
  83         struct wm831x *wm831x = dcdc->wm831x;
  84         int mask = 1 << rdev_get_id(rdev);
  85
  86         return wm831x_set_bits(wm831x, WM831X_DCDC_ENABLE, mask, mask);
  87 }
  88
  89 static int wm831x_dcdc_disable(struct regulator_dev *rdev)
  90 {
  91         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
  92         struct wm831x *wm831x = dcdc->wm831x;
  93         int mask = 1 << rdev_get_id(rdev);
  94
  95         return wm831x_set_bits(wm831x, WM831X_DCDC_ENABLE, mask, 0);
  96 }
  97
  98 static unsigned int wm831x_dcdc_get_mode(struct regulator_dev *rdev)
  99
 100 {
 101         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 102         struct wm831x *wm831x = dcdc->wm831x;
 103         u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
 104         int val;
 105
 106         val = wm831x_reg_read(wm831x, reg);
 107         if (val < 0)
 108                 return val;
 109
 110         val = (val & WM831X_DC1_ON_MODE_MASK) >> WM831X_DC1_ON_MODE_SHIFT;
 111
 112         switch (val) {
 113         case WM831X_DCDC_MODE_FAST:
 114                 return REGULATOR_MODE_FAST;
 115         case WM831X_DCDC_MODE_NORMAL:
 116                 return REGULATOR_MODE_NORMAL;
 117         case WM831X_DCDC_MODE_STANDBY:
 118                 return REGULATOR_MODE_STANDBY;
 119         case WM831X_DCDC_MODE_IDLE:
 120                 return REGULATOR_MODE_IDLE;
 121         default:
 122                 BUG();
 123                 return -EINVAL;
 124         }
 125 }
 126
 127 static int wm831x_dcdc_set_mode_int(struct wm831x *wm831x, int reg,
 128                                     unsigned int mode)
 129 {
 130         int val;
 131
 132         switch (mode) {
 133         case REGULATOR_MODE_FAST:
 134                 val = WM831X_DCDC_MODE_FAST;
 135                 break;
 136         case REGULATOR_MODE_NORMAL:
 137                 val = WM831X_DCDC_MODE_NORMAL;
 138                 break;
 139         case REGULATOR_MODE_STANDBY:
 140                 val = WM831X_DCDC_MODE_STANDBY;
 141                 break;
 142         case REGULATOR_MODE_IDLE:
 143                 val = WM831X_DCDC_MODE_IDLE;
 144                 break;
 145         default:
 146                 return -EINVAL;
 147         }
 148
 149         return wm831x_set_bits(wm831x, reg, WM831X_DC1_ON_MODE_MASK,
 150                                val << WM831X_DC1_ON_MODE_SHIFT);
 151 }
 152
 153 static int wm831x_dcdc_set_mode(struct regulator_dev *rdev, unsigned int mode)
 154 {
 155         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 156         struct wm831x *wm831x = dcdc->wm831x;
 157         u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
 158
 159         return wm831x_dcdc_set_mode_int(wm831x, reg, mode);
 160 }
 161
 162 static int wm831x_dcdc_set_suspend_mode(struct regulator_dev *rdev,
 163                                         unsigned int mode)
 164 {
 165         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 166         struct wm831x *wm831x = dcdc->wm831x;
 167         u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
 168
 169         return wm831x_dcdc_set_mode_int(wm831x, reg, mode);
 170 }
 171
 172 static int wm831x_dcdc_get_status(struct regulator_dev *rdev)
 173 {
 174         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 175         struct wm831x *wm831x = dcdc->wm831x;
 176         int ret;
 177
 178         /* First, check for errors */
 179         ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
 180         if (ret < 0)
 181                 return ret;
 182
 183         if (ret & (1 << rdev_get_id(rdev))) {
 184                 dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
 185                         rdev_get_id(rdev) + 1);
 186                 return REGULATOR_STATUS_ERROR;
 187         }
 188
 189         /* DCDC1 and DCDC2 can additionally detect high voltage/current */
 190         if (rdev_get_id(rdev) < 2) {
 191                 if (ret & (WM831X_DC1_OV_STS << rdev_get_id(rdev))) {
 192                         dev_dbg(wm831x->dev, "DCDC%d over voltage\n",
 193                                 rdev_get_id(rdev) + 1);
 194                         return REGULATOR_STATUS_ERROR;
 195                 }
 196
 197                 if (ret & (WM831X_DC1_HC_STS << rdev_get_id(rdev))) {
 198                         dev_dbg(wm831x->dev, "DCDC%d over current\n",
 199                                 rdev_get_id(rdev) + 1);
 200                         return REGULATOR_STATUS_ERROR;
 201                 }
 202         }
 203
 204         /* Is the regulator on? */
 205         ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
 206         if (ret < 0)
 207                 return ret;
 208         if (!(ret & (1 << rdev_get_id(rdev))))
 209                 return REGULATOR_STATUS_OFF;
 210
 211         /* TODO: When we handle hardware control modes so we can report the
 212          * current mode. */
 213         return REGULATOR_STATUS_ON;
 214 }
 215
 216 static irqreturn_t wm831x_dcdc_uv_irq(int irq, void *data)
 217 {
 218         struct wm831x_dcdc *dcdc = data;
 219
 220         regulator_notifier_call_chain(dcdc->regulator,
 221                                       REGULATOR_EVENT_UNDER_VOLTAGE,
 222                                       NULL);
 223
 224         return IRQ_HANDLED;
 225 }
 226
 227 static irqreturn_t wm831x_dcdc_oc_irq(int irq, void *data)
 228 {
 229         struct wm831x_dcdc *dcdc = data;
 230
 231         regulator_notifier_call_chain(dcdc->regulator,
 232                                       REGULATOR_EVENT_OVER_CURRENT,
 233                                       NULL);
 234
 235         return IRQ_HANDLED;
 236 }
 237
 238 /*
 239  * BUCKV specifics
 240  */
 241
 242 static int wm831x_buckv_list_voltage(struct regulator_dev *rdev,
 243                                       unsigned selector)
 244 {
 245         if (selector <= 0x8)
 246                 return 600000;
 247         if (selector <= WM831X_BUCKV_MAX_SELECTOR)
 248                 return 600000 + ((selector - 0x8) * 12500);
 249         return -EINVAL;
 250 }
 251
 252 static int wm831x_buckv_select_min_voltage(struct regulator_dev *rdev,
 253                                            int min_uV, int max_uV)
 254 {
 255         u16 vsel;
 256
 257         if (min_uV < 600000)
 258                 vsel = 0;
 259         else if (min_uV <= 1800000)
 260                 vsel = ((min_uV - 600000) / 12500) + 8;
 261         else
 262                 return -EINVAL;
 263
 264         if (wm831x_buckv_list_voltage(rdev, vsel) > max_uV)
 265                 return -EINVAL;
 266
 267         return vsel;
 268 }
 269
 270 static int wm831x_buckv_set_dvs(struct regulator_dev *rdev, int state)
 271 {
 272         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 273
 274         if (state == dcdc->dvs_gpio_state)
 275                 return 0;
 276
 277         dcdc->dvs_gpio_state = state;
 278         gpio_set_value(dcdc->dvs_gpio, state);
 279
 280         /* Should wait for DVS state change to be asserted if we have
 281          * a GPIO for it, for now assume the device is configured
 282          * for the fastest possible transition.
 283          */
 284
 285         return 0;
 286 }
 287
 288 static int wm831x_buckv_set_voltage(struct regulator_dev *rdev,
 289                                     int min_uV, int max_uV, unsigned *selector)
 290 {
 291         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 292         struct wm831x *wm831x = dcdc->wm831x;
 293         int on_reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
 294         int dvs_reg = dcdc->base + WM831X_DCDC_DVS_CONTROL;
 295         int vsel, ret;
 296
 297         vsel = wm831x_buckv_select_min_voltage(rdev, min_uV, max_uV);
 298         if (vsel < 0)
 299                 return vsel;
 300
 301         *selector = vsel;
 302
 303         /* If this value is already set then do a GPIO update if we can */
 304         if (dcdc->dvs_gpio && dcdc->on_vsel == vsel)
 305                 return wm831x_buckv_set_dvs(rdev, 0);
 306
 307         if (dcdc->dvs_gpio && dcdc->dvs_vsel == vsel)
 308                 return wm831x_buckv_set_dvs(rdev, 1);
 309
 310         /* Always set the ON status to the minimum voltage */
 311         ret = wm831x_set_bits(wm831x, on_reg, WM831X_DC1_ON_VSEL_MASK, vsel);
 312         if (ret < 0)
 313                 return ret;
 314         dcdc->on_vsel = vsel;
 315
 316         if (!dcdc->dvs_gpio)
 317                 return ret;
 318
 319         /* Kick the voltage transition now */
 320         ret = wm831x_buckv_set_dvs(rdev, 0);
 321         if (ret < 0)
 322                 return ret;
 323
 324         /*
 325          * If this VSEL is higher than the last one we've seen then
 326          * remember it as the DVS VSEL.  This is optimised for CPUfreq
 327          * usage where we want to get to the highest voltage very
 328          * quickly.
 329          */
 330         if (vsel > dcdc->dvs_vsel) {
 331                 ret = wm831x_set_bits(wm831x, dvs_reg,
 332                                       WM831X_DC1_DVS_VSEL_MASK,
 333                                       dcdc->dvs_vsel);
 334                 if (ret == 0)
 335                         dcdc->dvs_vsel = vsel;
 336                 else
 337                         dev_warn(wm831x->dev,
 338                                  "Failed to set DCDC DVS VSEL: %d\n", ret);
 339         }
 340
 341         return 0;
 342 }
 343
 344 static int wm831x_buckv_set_suspend_voltage(struct regulator_dev *rdev,
 345                                             int uV)
 346 {
 347         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 348         struct wm831x *wm831x = dcdc->wm831x;
 349         u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
 350         int vsel;
 351
 352         vsel = wm831x_buckv_select_min_voltage(rdev, uV, uV);
 353         if (vsel < 0)
 354                 return vsel;
 355
 356         return wm831x_set_bits(wm831x, reg, WM831X_DC1_SLP_VSEL_MASK, vsel);
 357 }
 358
 359 static int wm831x_buckv_get_voltage_sel(struct regulator_dev *rdev)
 360 {
 361         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 362
 363         if (dcdc->dvs_gpio && dcdc->dvs_gpio_state)
 364                 return dcdc->dvs_vsel;
 365         else
 366                 return dcdc->on_vsel;
 367 }
 368
 369 /* Current limit options */
 370 static u16 wm831x_dcdc_ilim[] = {
 371         125, 250, 375, 500, 625, 750, 875, 1000
 372 };
 373
 374 static int wm831x_buckv_set_current_limit(struct regulator_dev *rdev,
 375                                            int min_uA, int max_uA)
 376 {
 377         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 378         struct wm831x *wm831x = dcdc->wm831x;
 379         u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2;
 380         int i;
 381
 382         for (i = 0; i < ARRAY_SIZE(wm831x_dcdc_ilim); i++) {
 383                 if ((min_uA <= wm831x_dcdc_ilim[i]) &&
 384                     (wm831x_dcdc_ilim[i] <= max_uA))
 385                         break;
 386         }
 387         if (i == ARRAY_SIZE(wm831x_dcdc_ilim))
 388                 return -EINVAL;
 389
 390         return wm831x_set_bits(wm831x, reg, WM831X_DC1_HC_THR_MASK,
 391                                i << WM831X_DC1_HC_THR_SHIFT);
 392 }
 393
 394 static int wm831x_buckv_get_current_limit(struct regulator_dev *rdev)
 395 {
 396         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 397         struct wm831x *wm831x = dcdc->wm831x;
 398         u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2;
 399         int val;
 400
 401         val = wm831x_reg_read(wm831x, reg);
 402         if (val < 0)
 403                 return val;
 404
 405         val = (val & WM831X_DC1_HC_THR_MASK) >> WM831X_DC1_HC_THR_SHIFT;
 406         return wm831x_dcdc_ilim[val];
 407 }
 408
 409 static struct regulator_ops wm831x_buckv_ops = {
 410         .set_voltage = wm831x_buckv_set_voltage,
 411         .get_voltage_sel = wm831x_buckv_get_voltage_sel,
 412         .list_voltage = wm831x_buckv_list_voltage,
 413         .set_suspend_voltage = wm831x_buckv_set_suspend_voltage,
 414         .set_current_limit = wm831x_buckv_set_current_limit,
 415         .get_current_limit = wm831x_buckv_get_current_limit,
 416
 417         .is_enabled = wm831x_dcdc_is_enabled,
 418         .enable = wm831x_dcdc_enable,
 419         .disable = wm831x_dcdc_disable,
 420         .get_status = wm831x_dcdc_get_status,
 421         .get_mode = wm831x_dcdc_get_mode,
 422         .set_mode = wm831x_dcdc_set_mode,
 423         .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
 424 };
 425
 426 /*
 427  * Set up DVS control.  We just log errors since we can still run
 428  * (with reduced performance) if we fail.
 429  */
 430 static __devinit void wm831x_buckv_dvs_init(struct wm831x_dcdc *dcdc,
 431                                             struct wm831x_buckv_pdata *pdata)
 432 {
 433         struct wm831x *wm831x = dcdc->wm831x;
 434         int ret;
 435         u16 ctrl;
 436
 437         if (!pdata || !pdata->dvs_gpio)
 438                 return;
 439
 440         ret = gpio_request(pdata->dvs_gpio, "DCDC DVS");
 441         if (ret < 0) {
 442                 dev_err(wm831x->dev, "Failed to get %s DVS GPIO: %d\n",
 443                         dcdc->name, ret);
 444                 return;
 445         }
 446
 447         /* gpiolib won't let us read the GPIO status so pick the higher
 448          * of the two existing voltages so we take it as platform data.
 449          */
 450         dcdc->dvs_gpio_state = pdata->dvs_init_state;
 451
 452         ret = gpio_direction_output(pdata->dvs_gpio, dcdc->dvs_gpio_state);
 453         if (ret < 0) {
 454                 dev_err(wm831x->dev, "Failed to enable %s DVS GPIO: %d\n",
 455                         dcdc->name, ret);
 456                 gpio_free(pdata->dvs_gpio);
 457                 return;
 458         }
 459
 460         dcdc->dvs_gpio = pdata->dvs_gpio;
 461
 462         switch (pdata->dvs_control_src) {
 463         case 1:
 464                 ctrl = 2 << WM831X_DC1_DVS_SRC_SHIFT;
 465                 break;
 466         case 2:
 467                 ctrl = 3 << WM831X_DC1_DVS_SRC_SHIFT;
 468                 break;
 469         default:
 470                 dev_err(wm831x->dev, "Invalid DVS control source %d for %s\n",
 471                         pdata->dvs_control_src, dcdc->name);
 472                 return;
 473         }
 474
 475         /* If DVS_VSEL is set to the minimum value then raise it to ON_VSEL
 476          * to make bootstrapping a bit smoother.
 477          */
 478         if (!dcdc->dvs_vsel) {
 479                 ret = wm831x_set_bits(wm831x,
 480                                       dcdc->base + WM831X_DCDC_DVS_CONTROL,
 481                                       WM831X_DC1_DVS_VSEL_MASK, dcdc->on_vsel);
 482                 if (ret == 0)
 483                         dcdc->dvs_vsel = dcdc->on_vsel;
 484                 else
 485                         dev_warn(wm831x->dev, "Failed to set DVS_VSEL: %d\n",
 486                                  ret);
 487         }
 488
 489         ret = wm831x_set_bits(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL,
 490                               WM831X_DC1_DVS_SRC_MASK, ctrl);
 491         if (ret < 0) {
 492                 dev_err(wm831x->dev, "Failed to set %s DVS source: %d\n",
 493                         dcdc->name, ret);
 494         }
 495 }
 496
 497 static __devinit int wm831x_buckv_probe(struct platform_device *pdev)
 498 {
 499         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 500         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
 501         int id;
 502         struct wm831x_dcdc *dcdc;
 503         struct resource *res;
 504         int ret, irq;
 505
 506         if (pdata && pdata->wm831x_num)
 507                 id = (pdata->wm831x_num * 10) + 1;
 508         else
 509                 id = 0;
 510         id = pdev->id - id;
 511
 512         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
 513
 514         if (pdata == NULL || pdata->dcdc[id] == NULL)
 515                 return -ENODEV;
 516
 517         dcdc = devm_kzalloc(&pdev->dev,  sizeof(struct wm831x_dcdc),
 518                             GFP_KERNEL);
 519         if (dcdc == NULL) {
 520                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 521                 return -ENOMEM;
 522         }
 523
 524         dcdc->wm831x = wm831x;
 525
 526         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 527         if (res == NULL) {
 528                 dev_err(&pdev->dev, "No I/O resource\n");
 529                 ret = -EINVAL;
 530                 goto err;
 531         }
 532         dcdc->base = res->start;
 533
 534         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
 535         dcdc->desc.name = dcdc->name;
 536         dcdc->desc.id = id;
 537         dcdc->desc.type = REGULATOR_VOLTAGE;
 538         dcdc->desc.n_voltages = WM831X_BUCKV_MAX_SELECTOR + 1;
 539         dcdc->desc.ops = &wm831x_buckv_ops;
 540         dcdc->desc.owner = THIS_MODULE;
 541
 542         ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG);
 543         if (ret < 0) {
 544                 dev_err(wm831x->dev, "Failed to read ON VSEL: %d\n", ret);
 545                 goto err;
 546         }
 547         dcdc->on_vsel = ret & WM831X_DC1_ON_VSEL_MASK;
 548
 549         ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL);
 550         if (ret < 0) {
 551                 dev_err(wm831x->dev, "Failed to read DVS VSEL: %d\n", ret);
 552                 goto err;
 553         }
 554         dcdc->dvs_vsel = ret & WM831X_DC1_DVS_VSEL_MASK;
 555
 556         if (pdata->dcdc[id])
 557                 wm831x_buckv_dvs_init(dcdc, pdata->dcdc[id]->driver_data);
 558
 559         dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
 560                                              pdata->dcdc[id], dcdc, NULL);
 561         if (IS_ERR(dcdc->regulator)) {
 562                 ret = PTR_ERR(dcdc->regulator);
 563                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
 564                         id + 1, ret);
 565                 goto err;
 566         }
 567
 568         irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
 569         ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
 570                                    IRQF_TRIGGER_RISING, dcdc->name, dcdc);
 571         if (ret != 0) {
 572                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
 573                         irq, ret);
 574                 goto err_regulator;
 575         }
 576
 577         irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "HC"));
 578         ret = request_threaded_irq(irq, NULL, wm831x_dcdc_oc_irq,
 579                                    IRQF_TRIGGER_RISING, dcdc->name, dcdc);
 580         if (ret != 0) {
 581                 dev_err(&pdev->dev, "Failed to request HC IRQ %d: %d\n",
 582                         irq, ret);
 583                 goto err_uv;
 584         }
 585
 586         platform_set_drvdata(pdev, dcdc);
 587
 588         return 0;
 589
 590 err_uv:
 591         free_irq(wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV")),
 592                  dcdc);
 593 err_regulator:
 594         regulator_unregister(dcdc->regulator);
 595 err:
 596         if (dcdc->dvs_gpio)
 597                 gpio_free(dcdc->dvs_gpio);
 598         return ret;
 599 }
 600
 601 static __devexit int wm831x_buckv_remove(struct platform_device *pdev)
 602 {
 603         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
 604         struct wm831x *wm831x = dcdc->wm831x;
 605
 606         platform_set_drvdata(pdev, NULL);
 607
 608         free_irq(wm831x_irq(wm831x, platform_get_irq_byname(pdev, "HC")),
 609                             dcdc);
 610         free_irq(wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV")),
 611                             dcdc);
 612         regulator_unregister(dcdc->regulator);
 613         if (dcdc->dvs_gpio)
 614                 gpio_free(dcdc->dvs_gpio);
 615
 616         return 0;
 617 }
 618
 619 static struct platform_driver wm831x_buckv_driver = {
 620         .probe = wm831x_buckv_probe,
 621         .remove = __devexit_p(wm831x_buckv_remove),
 622         .driver         = {
 623                 .name   = "wm831x-buckv",
 624                 .owner  = THIS_MODULE,
 625         },
 626 };
 627
 628 /*
 629  * BUCKP specifics
 630  */
 631
 632 static int wm831x_buckp_list_voltage(struct regulator_dev *rdev,
 633                                       unsigned selector)
 634 {
 635         if (selector <= WM831X_BUCKP_MAX_SELECTOR)
 636                 return 850000 + (selector * 25000);
 637         else
 638                 return -EINVAL;
 639 }
 640
 641 static int wm831x_buckp_set_voltage_int(struct regulator_dev *rdev, int reg,
 642                                         int min_uV, int max_uV, int *selector)
 643 {
 644         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 645         struct wm831x *wm831x = dcdc->wm831x;
 646         u16 vsel;
 647
 648         if (min_uV <= 34000000)
 649                 vsel = (min_uV - 850000) / 25000;
 650         else
 651                 return -EINVAL;
 652
 653         if (wm831x_buckp_list_voltage(rdev, vsel) > max_uV)
 654                 return -EINVAL;
 655
 656         *selector = vsel;
 657
 658         return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, vsel);
 659 }
 660
 661 static int wm831x_buckp_set_voltage(struct regulator_dev *rdev,
 662                                     int min_uV, int max_uV,
 663                                     unsigned *selector)
 664 {
 665         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 666         u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
 667
 668         return wm831x_buckp_set_voltage_int(rdev, reg, min_uV, max_uV,
 669                                             selector);
 670 }
 671
 672 static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev,
 673                                             int uV)
 674 {
 675         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 676         u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
 677         unsigned selector;
 678
 679         return wm831x_buckp_set_voltage_int(rdev, reg, uV, uV, &selector);
 680 }
 681
 682 static int wm831x_buckp_get_voltage_sel(struct regulator_dev *rdev)
 683 {
 684         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 685         struct wm831x *wm831x = dcdc->wm831x;
 686         u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
 687         int val;
 688
 689         val = wm831x_reg_read(wm831x, reg);
 690         if (val < 0)
 691                 return val;
 692
 693         return val & WM831X_DC3_ON_VSEL_MASK;
 694 }
 695
 696 static struct regulator_ops wm831x_buckp_ops = {
 697         .set_voltage = wm831x_buckp_set_voltage,
 698         .get_voltage_sel = wm831x_buckp_get_voltage_sel,
 699         .list_voltage = wm831x_buckp_list_voltage,
 700         .set_suspend_voltage = wm831x_buckp_set_suspend_voltage,
 701
 702         .is_enabled = wm831x_dcdc_is_enabled,
 703         .enable = wm831x_dcdc_enable,
 704         .disable = wm831x_dcdc_disable,
 705         .get_status = wm831x_dcdc_get_status,
 706         .get_mode = wm831x_dcdc_get_mode,
 707         .set_mode = wm831x_dcdc_set_mode,
 708         .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
 709 };
 710
 711 static __devinit int wm831x_buckp_probe(struct platform_device *pdev)
 712 {
 713         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 714         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
 715         int id;
 716         struct wm831x_dcdc *dcdc;
 717         struct resource *res;
 718         int ret, irq;
 719
 720         if (pdata && pdata->wm831x_num)
 721                 id = (pdata->wm831x_num * 10) + 1;
 722         else
 723                 id = 0;
 724         id = pdev->id - id;
 725
 726         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
 727
 728         if (pdata == NULL || pdata->dcdc[id] == NULL)
 729                 return -ENODEV;
 730
 731         dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc),
 732                             GFP_KERNEL);
 733         if (dcdc == NULL) {
 734                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 735                 return -ENOMEM;
 736         }
 737
 738         dcdc->wm831x = wm831x;
 739
 740         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 741         if (res == NULL) {
 742                 dev_err(&pdev->dev, "No I/O resource\n");
 743                 ret = -EINVAL;
 744                 goto err;
 745         }
 746         dcdc->base = res->start;
 747
 748         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
 749         dcdc->desc.name = dcdc->name;
 750         dcdc->desc.id = id;
 751         dcdc->desc.type = REGULATOR_VOLTAGE;
 752         dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1;
 753         dcdc->desc.ops = &wm831x_buckp_ops;
 754         dcdc->desc.owner = THIS_MODULE;
 755
 756         dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
 757                                              pdata->dcdc[id], dcdc, NULL);
 758         if (IS_ERR(dcdc->regulator)) {
 759                 ret = PTR_ERR(dcdc->regulator);
 760                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
 761                         id + 1, ret);
 762                 goto err;
 763         }
 764
 765         irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
 766         ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
 767                                    IRQF_TRIGGER_RISING, dcdc->name, dcdc);
 768         if (ret != 0) {
 769                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
 770                         irq, ret);
 771                 goto err_regulator;
 772         }
 773
 774         platform_set_drvdata(pdev, dcdc);
 775
 776         return 0;
 777
 778 err_regulator:
 779         regulator_unregister(dcdc->regulator);
 780 err:
 781         return ret;
 782 }
 783
 784 static __devexit int wm831x_buckp_remove(struct platform_device *pdev)
 785 {
 786         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
 787
 788         platform_set_drvdata(pdev, NULL);
 789
 790         free_irq(wm831x_irq(dcdc->wm831x, platform_get_irq_byname(pdev, "UV")),
 791                             dcdc);
 792         regulator_unregister(dcdc->regulator);
 793
 794         return 0;
 795 }
 796
 797 static struct platform_driver wm831x_buckp_driver = {
 798         .probe = wm831x_buckp_probe,
 799         .remove = __devexit_p(wm831x_buckp_remove),
 800         .driver         = {
 801                 .name   = "wm831x-buckp",
 802                 .owner  = THIS_MODULE,
 803         },
 804 };
 805
 806 /*
 807  * DCDC boost convertors
 808  */
 809
 810 static int wm831x_boostp_get_status(struct regulator_dev *rdev)
 811 {
 812         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 813         struct wm831x *wm831x = dcdc->wm831x;
 814         int ret;
 815
 816         /* First, check for errors */
 817         ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
 818         if (ret < 0)
 819                 return ret;
 820
 821         if (ret & (1 << rdev_get_id(rdev))) {
 822                 dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
 823                         rdev_get_id(rdev) + 1);
 824                 return REGULATOR_STATUS_ERROR;
 825         }
 826
 827         /* Is the regulator on? */
 828         ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
 829         if (ret < 0)
 830                 return ret;
 831         if (ret & (1 << rdev_get_id(rdev)))
 832                 return REGULATOR_STATUS_ON;
 833         else
 834                 return REGULATOR_STATUS_OFF;
 835 }
 836
 837 static struct regulator_ops wm831x_boostp_ops = {
 838         .get_status = wm831x_boostp_get_status,
 839
 840         .is_enabled = wm831x_dcdc_is_enabled,
 841         .enable = wm831x_dcdc_enable,
 842         .disable = wm831x_dcdc_disable,
 843 };
 844
 845 static __devinit int wm831x_boostp_probe(struct platform_device *pdev)
 846 {
 847         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 848         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
 849         int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
 850         struct wm831x_dcdc *dcdc;
 851         struct resource *res;
 852         int ret, irq;
 853
 854         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
 855
 856         if (pdata == NULL || pdata->dcdc[id] == NULL)
 857                 return -ENODEV;
 858
 859         dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
 860         if (dcdc == NULL) {
 861                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 862                 return -ENOMEM;
 863         }
 864
 865         dcdc->wm831x = wm831x;
 866
 867         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 868         if (res == NULL) {
 869                 dev_err(&pdev->dev, "No I/O resource\n");
 870                 ret = -EINVAL;
 871                 goto err;
 872         }
 873         dcdc->base = res->start;
 874
 875         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
 876         dcdc->desc.name = dcdc->name;
 877         dcdc->desc.id = id;
 878         dcdc->desc.type = REGULATOR_VOLTAGE;
 879         dcdc->desc.ops = &wm831x_boostp_ops;
 880         dcdc->desc.owner = THIS_MODULE;
 881
 882         dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
 883                                              pdata->dcdc[id], dcdc, NULL);
 884         if (IS_ERR(dcdc->regulator)) {
 885                 ret = PTR_ERR(dcdc->regulator);
 886                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
 887                         id + 1, ret);
 888                 goto err;
 889         }
 890
 891         irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
 892         ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
 893                                    IRQF_TRIGGER_RISING, dcdc->name,
 894                                    dcdc);
 895         if (ret != 0) {
 896                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
 897                         irq, ret);
 898                 goto err_regulator;
 899         }
 900
 901         platform_set_drvdata(pdev, dcdc);
 902
 903         return 0;
 904
 905 err_regulator:
 906         regulator_unregister(dcdc->regulator);
 907 err:
 908         kfree(dcdc);
 909         return ret;
 910 }
 911
 912 static __devexit int wm831x_boostp_remove(struct platform_device *pdev)
 913 {
 914         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
 915
 916         platform_set_drvdata(pdev, NULL);
 917
 918         free_irq(wm831x_irq(dcdc->wm831x, platform_get_irq_byname(pdev, "UV")),
 919                  dcdc);
 920         regulator_unregister(dcdc->regulator);
 921         kfree(dcdc);
 922
 923         return 0;
 924 }
 925
 926 static struct platform_driver wm831x_boostp_driver = {
 927         .probe = wm831x_boostp_probe,
 928         .remove = __devexit_p(wm831x_boostp_remove),
 929         .driver         = {
 930                 .name   = "wm831x-boostp",
 931                 .owner  = THIS_MODULE,
 932         },
 933 };
 934
 935 /*
 936  * External Power Enable
 937  *
 938  * These aren't actually DCDCs but look like them in hardware so share
 939  * code.
 940  */
 941
 942 #define WM831X_EPE_BASE 6
 943
 944 static struct regulator_ops wm831x_epe_ops = {
 945         .is_enabled = wm831x_dcdc_is_enabled,
 946         .enable = wm831x_dcdc_enable,
 947         .disable = wm831x_dcdc_disable,
 948         .get_status = wm831x_dcdc_get_status,
 949 };
 950
 951 static __devinit int wm831x_epe_probe(struct platform_device *pdev)
 952 {
 953         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 954         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
 955         int id = pdev->id % ARRAY_SIZE(pdata->epe);
 956         struct wm831x_dcdc *dcdc;
 957         int ret;
 958
 959         dev_dbg(&pdev->dev, "Probing EPE%d\n", id + 1);
 960
 961         if (pdata == NULL || pdata->epe[id] == NULL)
 962                 return -ENODEV;
 963
 964         dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
 965         if (dcdc == NULL) {
 966                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 967                 return -ENOMEM;
 968         }
 969
 970         dcdc->wm831x = wm831x;
 971
 972         /* For current parts this is correct; probably need to revisit
 973          * in future.
 974          */
 975         snprintf(dcdc->name, sizeof(dcdc->name), "EPE%d", id + 1);
 976         dcdc->desc.name = dcdc->name;
 977         dcdc->desc.id = id + WM831X_EPE_BASE; /* Offset in DCDC registers */
 978         dcdc->desc.ops = &wm831x_epe_ops;
 979         dcdc->desc.type = REGULATOR_VOLTAGE;
 980         dcdc->desc.owner = THIS_MODULE;
 981
 982         dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
 983                                              pdata->epe[id], dcdc, NULL);
 984         if (IS_ERR(dcdc->regulator)) {
 985                 ret = PTR_ERR(dcdc->regulator);
 986                 dev_err(wm831x->dev, "Failed to register EPE%d: %d\n",
 987                         id + 1, ret);
 988                 goto err;
 989         }
 990
 991         platform_set_drvdata(pdev, dcdc);
 992
 993         return 0;
 994
 995 err:
 996         kfree(dcdc);
 997         return ret;
 998 }
 999
1000 static __devexit int wm831x_epe_remove(struct platform_device *pdev)
1001 {
1002         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
1003
1004         platform_set_drvdata(pdev, NULL);
1005
1006         regulator_unregister(dcdc->regulator);
1007         kfree(dcdc);
1008
1009         return 0;
1010 }
1011
1012 static struct platform_driver wm831x_epe_driver = {
1013         .probe = wm831x_epe_probe,
1014         .remove = __devexit_p(wm831x_epe_remove),
1015         .driver         = {
1016                 .name   = "wm831x-epe",
1017                 .owner  = THIS_MODULE,
1018         },
1019 };
1020
1021 static int __init wm831x_dcdc_init(void)
1022 {
1023         int ret;
1024         ret = platform_driver_register(&wm831x_buckv_driver);
1025         if (ret != 0)
1026                 pr_err("Failed to register WM831x BUCKV driver: %d\n", ret);
1027
1028         ret = platform_driver_register(&wm831x_buckp_driver);
1029         if (ret != 0)
1030                 pr_err("Failed to register WM831x BUCKP driver: %d\n", ret);
1031
1032         ret = platform_driver_register(&wm831x_boostp_driver);
1033         if (ret != 0)
1034                 pr_err("Failed to register WM831x BOOST driver: %d\n", ret);
1035
1036         ret = platform_driver_register(&wm831x_epe_driver);
1037         if (ret != 0)
1038                 pr_err("Failed to register WM831x EPE driver: %d\n", ret);
1039
1040         return 0;
1041 }
1042 subsys_initcall(wm831x_dcdc_init);
1043
1044 static void __exit wm831x_dcdc_exit(void)
1045 {
1046         platform_driver_unregister(&wm831x_epe_driver);
1047         platform_driver_unregister(&wm831x_boostp_driver);
1048         platform_driver_unregister(&wm831x_buckp_driver);
1049         platform_driver_unregister(&wm831x_buckv_driver);
1050 }
1051 module_exit(wm831x_dcdc_exit);
1052
1053 /* Module information */
1054 MODULE_AUTHOR("Mark Brown");
1055 MODULE_DESCRIPTION("WM831x DC-DC convertor driver");
1056 MODULE_LICENSE("GPL");
1057 MODULE_ALIAS("platform:wm831x-buckv");
1058 MODULE_ALIAS("platform:wm831x-buckp");
1059 MODULE_ALIAS("platform:wm831x-epe");