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 = 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 = 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(platform_get_irq_byname(pdev, "UV"), dcdc);
 592 err_regulator:
 593         regulator_unregister(dcdc->regulator);
 594 err:
 595         if (dcdc->dvs_gpio)
 596                 gpio_free(dcdc->dvs_gpio);
 597         return ret;
 598 }
 599
 600 static __devexit int wm831x_buckv_remove(struct platform_device *pdev)
 601 {
 602         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
 603
 604         platform_set_drvdata(pdev, NULL);
 605
 606         free_irq(platform_get_irq_byname(pdev, "HC"), dcdc);
 607         free_irq(platform_get_irq_byname(pdev, "UV"), dcdc);
 608         regulator_unregister(dcdc->regulator);
 609         if (dcdc->dvs_gpio)
 610                 gpio_free(dcdc->dvs_gpio);
 611
 612         return 0;
 613 }
 614
 615 static struct platform_driver wm831x_buckv_driver = {
 616         .probe = wm831x_buckv_probe,
 617         .remove = __devexit_p(wm831x_buckv_remove),
 618         .driver         = {
 619                 .name   = "wm831x-buckv",
 620                 .owner  = THIS_MODULE,
 621         },
 622 };
 623
 624 /*
 625  * BUCKP specifics
 626  */
 627
 628 static int wm831x_buckp_list_voltage(struct regulator_dev *rdev,
 629                                       unsigned selector)
 630 {
 631         if (selector <= WM831X_BUCKP_MAX_SELECTOR)
 632                 return 850000 + (selector * 25000);
 633         else
 634                 return -EINVAL;
 635 }
 636
 637 static int wm831x_buckp_set_voltage_int(struct regulator_dev *rdev, int reg,
 638                                         int min_uV, int max_uV, int *selector)
 639 {
 640         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 641         struct wm831x *wm831x = dcdc->wm831x;
 642         u16 vsel;
 643
 644         if (min_uV <= 34000000)
 645                 vsel = (min_uV - 850000) / 25000;
 646         else
 647                 return -EINVAL;
 648
 649         if (wm831x_buckp_list_voltage(rdev, vsel) > max_uV)
 650                 return -EINVAL;
 651
 652         *selector = vsel;
 653
 654         return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, vsel);
 655 }
 656
 657 static int wm831x_buckp_set_voltage(struct regulator_dev *rdev,
 658                                     int min_uV, int max_uV,
 659                                     unsigned *selector)
 660 {
 661         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 662         u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
 663
 664         return wm831x_buckp_set_voltage_int(rdev, reg, min_uV, max_uV,
 665                                             selector);
 666 }
 667
 668 static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev,
 669                                             int uV)
 670 {
 671         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 672         u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
 673         unsigned selector;
 674
 675         return wm831x_buckp_set_voltage_int(rdev, reg, uV, uV, &selector);
 676 }
 677
 678 static int wm831x_buckp_get_voltage_sel(struct regulator_dev *rdev)
 679 {
 680         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 681         struct wm831x *wm831x = dcdc->wm831x;
 682         u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
 683         int val;
 684
 685         val = wm831x_reg_read(wm831x, reg);
 686         if (val < 0)
 687                 return val;
 688
 689         return val & WM831X_DC3_ON_VSEL_MASK;
 690 }
 691
 692 static struct regulator_ops wm831x_buckp_ops = {
 693         .set_voltage = wm831x_buckp_set_voltage,
 694         .get_voltage_sel = wm831x_buckp_get_voltage_sel,
 695         .list_voltage = wm831x_buckp_list_voltage,
 696         .set_suspend_voltage = wm831x_buckp_set_suspend_voltage,
 697
 698         .is_enabled = wm831x_dcdc_is_enabled,
 699         .enable = wm831x_dcdc_enable,
 700         .disable = wm831x_dcdc_disable,
 701         .get_status = wm831x_dcdc_get_status,
 702         .get_mode = wm831x_dcdc_get_mode,
 703         .set_mode = wm831x_dcdc_set_mode,
 704         .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
 705 };
 706
 707 static __devinit int wm831x_buckp_probe(struct platform_device *pdev)
 708 {
 709         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 710         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
 711         int id;
 712         struct wm831x_dcdc *dcdc;
 713         struct resource *res;
 714         int ret, irq;
 715
 716         if (pdata && pdata->wm831x_num)
 717                 id = (pdata->wm831x_num * 10) + 1;
 718         else
 719                 id = 0;
 720         id = pdev->id - id;
 721
 722         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
 723
 724         if (pdata == NULL || pdata->dcdc[id] == NULL)
 725                 return -ENODEV;
 726
 727         dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc),
 728                             GFP_KERNEL);
 729         if (dcdc == NULL) {
 730                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 731                 return -ENOMEM;
 732         }
 733
 734         dcdc->wm831x = wm831x;
 735
 736         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 737         if (res == NULL) {
 738                 dev_err(&pdev->dev, "No I/O resource\n");
 739                 ret = -EINVAL;
 740                 goto err;
 741         }
 742         dcdc->base = res->start;
 743
 744         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
 745         dcdc->desc.name = dcdc->name;
 746         dcdc->desc.id = id;
 747         dcdc->desc.type = REGULATOR_VOLTAGE;
 748         dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1;
 749         dcdc->desc.ops = &wm831x_buckp_ops;
 750         dcdc->desc.owner = THIS_MODULE;
 751
 752         dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
 753                                              pdata->dcdc[id], dcdc, NULL);
 754         if (IS_ERR(dcdc->regulator)) {
 755                 ret = PTR_ERR(dcdc->regulator);
 756                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
 757                         id + 1, ret);
 758                 goto err;
 759         }
 760
 761         irq = platform_get_irq_byname(pdev, "UV");
 762         ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
 763                                    IRQF_TRIGGER_RISING, dcdc->name, dcdc);
 764         if (ret != 0) {
 765                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
 766                         irq, ret);
 767                 goto err_regulator;
 768         }
 769
 770         platform_set_drvdata(pdev, dcdc);
 771
 772         return 0;
 773
 774 err_regulator:
 775         regulator_unregister(dcdc->regulator);
 776 err:
 777         return ret;
 778 }
 779
 780 static __devexit int wm831x_buckp_remove(struct platform_device *pdev)
 781 {
 782         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
 783
 784         platform_set_drvdata(pdev, NULL);
 785
 786         free_irq(platform_get_irq_byname(pdev, "UV"), dcdc);
 787         regulator_unregister(dcdc->regulator);
 788
 789         return 0;
 790 }
 791
 792 static struct platform_driver wm831x_buckp_driver = {
 793         .probe = wm831x_buckp_probe,
 794         .remove = __devexit_p(wm831x_buckp_remove),
 795         .driver         = {
 796                 .name   = "wm831x-buckp",
 797                 .owner  = THIS_MODULE,
 798         },
 799 };
 800
 801 /*
 802  * DCDC boost convertors
 803  */
 804
 805 static int wm831x_boostp_get_status(struct regulator_dev *rdev)
 806 {
 807         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 808         struct wm831x *wm831x = dcdc->wm831x;
 809         int ret;
 810
 811         /* First, check for errors */
 812         ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
 813         if (ret < 0)
 814                 return ret;
 815
 816         if (ret & (1 << rdev_get_id(rdev))) {
 817                 dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
 818                         rdev_get_id(rdev) + 1);
 819                 return REGULATOR_STATUS_ERROR;
 820         }
 821
 822         /* Is the regulator on? */
 823         ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
 824         if (ret < 0)
 825                 return ret;
 826         if (ret & (1 << rdev_get_id(rdev)))
 827                 return REGULATOR_STATUS_ON;
 828         else
 829                 return REGULATOR_STATUS_OFF;
 830 }
 831
 832 static struct regulator_ops wm831x_boostp_ops = {
 833         .get_status = wm831x_boostp_get_status,
 834
 835         .is_enabled = wm831x_dcdc_is_enabled,
 836         .enable = wm831x_dcdc_enable,
 837         .disable = wm831x_dcdc_disable,
 838 };
 839
 840 static __devinit int wm831x_boostp_probe(struct platform_device *pdev)
 841 {
 842         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 843         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
 844         int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
 845         struct wm831x_dcdc *dcdc;
 846         struct resource *res;
 847         int ret, irq;
 848
 849         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
 850
 851         if (pdata == NULL || pdata->dcdc[id] == NULL)
 852                 return -ENODEV;
 853
 854         dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
 855         if (dcdc == NULL) {
 856                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 857                 return -ENOMEM;
 858         }
 859
 860         dcdc->wm831x = wm831x;
 861
 862         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 863         if (res == NULL) {
 864                 dev_err(&pdev->dev, "No I/O resource\n");
 865                 ret = -EINVAL;
 866                 goto err;
 867         }
 868         dcdc->base = res->start;
 869
 870         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
 871         dcdc->desc.name = dcdc->name;
 872         dcdc->desc.id = id;
 873         dcdc->desc.type = REGULATOR_VOLTAGE;
 874         dcdc->desc.ops = &wm831x_boostp_ops;
 875         dcdc->desc.owner = THIS_MODULE;
 876
 877         dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
 878                                              pdata->dcdc[id], dcdc, NULL);
 879         if (IS_ERR(dcdc->regulator)) {
 880                 ret = PTR_ERR(dcdc->regulator);
 881                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
 882                         id + 1, ret);
 883                 goto err;
 884         }
 885
 886         irq = platform_get_irq_byname(pdev, "UV");
 887         ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
 888                                    IRQF_TRIGGER_RISING, dcdc->name,
 889                                    dcdc);
 890         if (ret != 0) {
 891                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
 892                         irq, ret);
 893                 goto err_regulator;
 894         }
 895
 896         platform_set_drvdata(pdev, dcdc);
 897
 898         return 0;
 899
 900 err_regulator:
 901         regulator_unregister(dcdc->regulator);
 902 err:
 903         kfree(dcdc);
 904         return ret;
 905 }
 906
 907 static __devexit int wm831x_boostp_remove(struct platform_device *pdev)
 908 {
 909         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
 910
 911         platform_set_drvdata(pdev, NULL);
 912
 913         free_irq(platform_get_irq_byname(pdev, "UV"), dcdc);
 914         regulator_unregister(dcdc->regulator);
 915         kfree(dcdc);
 916
 917         return 0;
 918 }
 919
 920 static struct platform_driver wm831x_boostp_driver = {
 921         .probe = wm831x_boostp_probe,
 922         .remove = __devexit_p(wm831x_boostp_remove),
 923         .driver         = {
 924                 .name   = "wm831x-boostp",
 925                 .owner  = THIS_MODULE,
 926         },
 927 };
 928
 929 /*
 930  * External Power Enable
 931  *
 932  * These aren't actually DCDCs but look like them in hardware so share
 933  * code.
 934  */
 935
 936 #define WM831X_EPE_BASE 6
 937
 938 static struct regulator_ops wm831x_epe_ops = {
 939         .is_enabled = wm831x_dcdc_is_enabled,
 940         .enable = wm831x_dcdc_enable,
 941         .disable = wm831x_dcdc_disable,
 942         .get_status = wm831x_dcdc_get_status,
 943 };
 944
 945 static __devinit int wm831x_epe_probe(struct platform_device *pdev)
 946 {
 947         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 948         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
 949         int id = pdev->id % ARRAY_SIZE(pdata->epe);
 950         struct wm831x_dcdc *dcdc;
 951         int ret;
 952
 953         dev_dbg(&pdev->dev, "Probing EPE%d\n", id + 1);
 954
 955         if (pdata == NULL || pdata->epe[id] == NULL)
 956                 return -ENODEV;
 957
 958         dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
 959         if (dcdc == NULL) {
 960                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 961                 return -ENOMEM;
 962         }
 963
 964         dcdc->wm831x = wm831x;
 965
 966         /* For current parts this is correct; probably need to revisit
 967          * in future.
 968          */
 969         snprintf(dcdc->name, sizeof(dcdc->name), "EPE%d", id + 1);
 970         dcdc->desc.name = dcdc->name;
 971         dcdc->desc.id = id + WM831X_EPE_BASE; /* Offset in DCDC registers */
 972         dcdc->desc.ops = &wm831x_epe_ops;
 973         dcdc->desc.type = REGULATOR_VOLTAGE;
 974         dcdc->desc.owner = THIS_MODULE;
 975
 976         dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
 977                                              pdata->epe[id], dcdc, NULL);
 978         if (IS_ERR(dcdc->regulator)) {
 979                 ret = PTR_ERR(dcdc->regulator);
 980                 dev_err(wm831x->dev, "Failed to register EPE%d: %d\n",
 981                         id + 1, ret);
 982                 goto err;
 983         }
 984
 985         platform_set_drvdata(pdev, dcdc);
 986
 987         return 0;
 988
 989 err:
 990         kfree(dcdc);
 991         return ret;
 992 }
 993
 994 static __devexit int wm831x_epe_remove(struct platform_device *pdev)
 995 {
 996         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
 997
 998         platform_set_drvdata(pdev, NULL);
 999
1000         regulator_unregister(dcdc->regulator);
1001         kfree(dcdc);
1002
1003         return 0;
1004 }
1005
1006 static struct platform_driver wm831x_epe_driver = {
1007         .probe = wm831x_epe_probe,
1008         .remove = __devexit_p(wm831x_epe_remove),
1009         .driver         = {
1010                 .name   = "wm831x-epe",
1011                 .owner  = THIS_MODULE,
1012         },
1013 };
1014
1015 static int __init wm831x_dcdc_init(void)
1016 {
1017         int ret;
1018         ret = platform_driver_register(&wm831x_buckv_driver);
1019         if (ret != 0)
1020                 pr_err("Failed to register WM831x BUCKV driver: %d\n", ret);
1021
1022         ret = platform_driver_register(&wm831x_buckp_driver);
1023         if (ret != 0)
1024                 pr_err("Failed to register WM831x BUCKP driver: %d\n", ret);
1025
1026         ret = platform_driver_register(&wm831x_boostp_driver);
1027         if (ret != 0)
1028                 pr_err("Failed to register WM831x BOOST driver: %d\n", ret);
1029
1030         ret = platform_driver_register(&wm831x_epe_driver);
1031         if (ret != 0)
1032                 pr_err("Failed to register WM831x EPE driver: %d\n", ret);
1033
1034         return 0;
1035 }
1036 subsys_initcall(wm831x_dcdc_init);
1037
1038 static void __exit wm831x_dcdc_exit(void)
1039 {
1040         platform_driver_unregister(&wm831x_epe_driver);
1041         platform_driver_unregister(&wm831x_boostp_driver);
1042         platform_driver_unregister(&wm831x_buckp_driver);
1043         platform_driver_unregister(&wm831x_buckv_driver);
1044 }
1045 module_exit(wm831x_dcdc_exit);
1046
1047 /* Module information */
1048 MODULE_AUTHOR("Mark Brown");
1049 MODULE_DESCRIPTION("WM831x DC-DC convertor driver");
1050 MODULE_LICENSE("GPL");
1051 MODULE_ALIAS("platform:wm831x-buckv");
1052 MODULE_ALIAS("platform:wm831x-buckp");
1053 MODULE_ALIAS("platform:wm831x-epe");