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_select_max_voltage(struct regulator_dev *rdev,
 271                                            int min_uV, int max_uV)
 272 {
 273         u16 vsel;
 274
 275         if (max_uV < 600000 || max_uV > 1800000)
 276                 return -EINVAL;
 277
 278         vsel = ((max_uV - 600000) / 12500) + 8;
 279
 280         if (wm831x_buckv_list_voltage(rdev, vsel) < min_uV ||
 281             wm831x_buckv_list_voltage(rdev, vsel) < max_uV)
 282                 return -EINVAL;
 283
 284         return vsel;
 285 }
 286
 287 static int wm831x_buckv_set_dvs(struct regulator_dev *rdev, int state)
 288 {
 289         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 290
 291         if (state == dcdc->dvs_gpio_state)
 292                 return 0;
 293
 294         dcdc->dvs_gpio_state = state;
 295         gpio_set_value(dcdc->dvs_gpio, state);
 296
 297         /* Should wait for DVS state change to be asserted if we have
 298          * a GPIO for it, for now assume the device is configured
 299          * for the fastest possible transition.
 300          */
 301
 302         return 0;
 303 }
 304
 305 static int wm831x_buckv_set_voltage(struct regulator_dev *rdev,
 306                                     int min_uV, int max_uV, unsigned *selector)
 307 {
 308         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 309         struct wm831x *wm831x = dcdc->wm831x;
 310         int on_reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
 311         int dvs_reg = dcdc->base + WM831X_DCDC_DVS_CONTROL;
 312         int vsel, ret;
 313
 314         vsel = wm831x_buckv_select_min_voltage(rdev, min_uV, max_uV);
 315         if (vsel < 0)
 316                 return vsel;
 317
 318         *selector = vsel;
 319
 320         /* If this value is already set then do a GPIO update if we can */
 321         if (dcdc->dvs_gpio && dcdc->on_vsel == vsel)
 322                 return wm831x_buckv_set_dvs(rdev, 0);
 323
 324         if (dcdc->dvs_gpio && dcdc->dvs_vsel == vsel)
 325                 return wm831x_buckv_set_dvs(rdev, 1);
 326
 327         /* Always set the ON status to the minimum voltage */
 328         ret = wm831x_set_bits(wm831x, on_reg, WM831X_DC1_ON_VSEL_MASK, vsel);
 329         if (ret < 0)
 330                 return ret;
 331         dcdc->on_vsel = vsel;
 332
 333         if (!dcdc->dvs_gpio)
 334                 return ret;
 335
 336         /* Kick the voltage transition now */
 337         ret = wm831x_buckv_set_dvs(rdev, 0);
 338         if (ret < 0)
 339                 return ret;
 340
 341         /* Set the high voltage as the DVS voltage.  This is optimised
 342          * for CPUfreq usage, most processors will keep the maximum
 343          * voltage constant and lower the minimum with the frequency. */
 344         vsel = wm831x_buckv_select_max_voltage(rdev, min_uV, max_uV);
 345         if (vsel < 0) {
 346                 /* This should never happen - at worst the same vsel
 347                  * should be chosen */
 348                 WARN_ON(vsel < 0);
 349                 return 0;
 350         }
 351
 352         /* Don't bother if it's the same VSEL we're already using */
 353         if (vsel == dcdc->on_vsel)
 354                 return 0;
 355
 356         ret = wm831x_set_bits(wm831x, dvs_reg, WM831X_DC1_DVS_VSEL_MASK, vsel);
 357         if (ret == 0)
 358                 dcdc->dvs_vsel = vsel;
 359         else
 360                 dev_warn(wm831x->dev, "Failed to set DCDC DVS VSEL: %d\n",
 361                          ret);
 362
 363         return 0;
 364 }
 365
 366 static int wm831x_buckv_set_suspend_voltage(struct regulator_dev *rdev,
 367                                             int uV)
 368 {
 369         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 370         struct wm831x *wm831x = dcdc->wm831x;
 371         u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
 372         int vsel;
 373
 374         vsel = wm831x_buckv_select_min_voltage(rdev, uV, uV);
 375         if (vsel < 0)
 376                 return vsel;
 377
 378         return wm831x_set_bits(wm831x, reg, WM831X_DC1_SLP_VSEL_MASK, vsel);
 379 }
 380
 381 static int wm831x_buckv_get_voltage_sel(struct regulator_dev *rdev)
 382 {
 383         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 384
 385         if (dcdc->dvs_gpio && dcdc->dvs_gpio_state)
 386                 return dcdc->dvs_vsel;
 387         else
 388                 return dcdc->on_vsel;
 389 }
 390
 391 /* Current limit options */
 392 static u16 wm831x_dcdc_ilim[] = {
 393         125, 250, 375, 500, 625, 750, 875, 1000
 394 };
 395
 396 static int wm831x_buckv_set_current_limit(struct regulator_dev *rdev,
 397                                            int min_uA, int max_uA)
 398 {
 399         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 400         struct wm831x *wm831x = dcdc->wm831x;
 401         u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2;
 402         int i;
 403
 404         for (i = 0; i < ARRAY_SIZE(wm831x_dcdc_ilim); i++) {
 405                 if (max_uA <= wm831x_dcdc_ilim[i])
 406                         break;
 407         }
 408         if (i == ARRAY_SIZE(wm831x_dcdc_ilim))
 409                 return -EINVAL;
 410
 411         return wm831x_set_bits(wm831x, reg, WM831X_DC1_HC_THR_MASK, i);
 412 }
 413
 414 static int wm831x_buckv_get_current_limit(struct regulator_dev *rdev)
 415 {
 416         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 417         struct wm831x *wm831x = dcdc->wm831x;
 418         u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2;
 419         int val;
 420
 421         val = wm831x_reg_read(wm831x, reg);
 422         if (val < 0)
 423                 return val;
 424
 425         return wm831x_dcdc_ilim[val & WM831X_DC1_HC_THR_MASK];
 426 }
 427
 428 static struct regulator_ops wm831x_buckv_ops = {
 429         .set_voltage = wm831x_buckv_set_voltage,
 430         .get_voltage_sel = wm831x_buckv_get_voltage_sel,
 431         .list_voltage = wm831x_buckv_list_voltage,
 432         .set_suspend_voltage = wm831x_buckv_set_suspend_voltage,
 433         .set_current_limit = wm831x_buckv_set_current_limit,
 434         .get_current_limit = wm831x_buckv_get_current_limit,
 435
 436         .is_enabled = wm831x_dcdc_is_enabled,
 437         .enable = wm831x_dcdc_enable,
 438         .disable = wm831x_dcdc_disable,
 439         .get_status = wm831x_dcdc_get_status,
 440         .get_mode = wm831x_dcdc_get_mode,
 441         .set_mode = wm831x_dcdc_set_mode,
 442         .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
 443 };
 444
 445 /*
 446  * Set up DVS control.  We just log errors since we can still run
 447  * (with reduced performance) if we fail.
 448  */
 449 static __devinit void wm831x_buckv_dvs_init(struct wm831x_dcdc *dcdc,
 450                                             struct wm831x_buckv_pdata *pdata)
 451 {
 452         struct wm831x *wm831x = dcdc->wm831x;
 453         int ret;
 454         u16 ctrl;
 455
 456         if (!pdata || !pdata->dvs_gpio)
 457                 return;
 458
 459         switch (pdata->dvs_control_src) {
 460         case 1:
 461                 ctrl = 2 << WM831X_DC1_DVS_SRC_SHIFT;
 462                 break;
 463         case 2:
 464                 ctrl = 3 << WM831X_DC1_DVS_SRC_SHIFT;
 465                 break;
 466         default:
 467                 dev_err(wm831x->dev, "Invalid DVS control source %d for %s\n",
 468                         pdata->dvs_control_src, dcdc->name);
 469                 return;
 470         }
 471
 472         ret = wm831x_set_bits(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL,
 473                               WM831X_DC1_DVS_SRC_MASK, ctrl);
 474         if (ret < 0) {
 475                 dev_err(wm831x->dev, "Failed to set %s DVS source: %d\n",
 476                         dcdc->name, ret);
 477                 return;
 478         }
 479
 480         ret = gpio_request(pdata->dvs_gpio, "DCDC DVS");
 481         if (ret < 0) {
 482                 dev_err(wm831x->dev, "Failed to get %s DVS GPIO: %d\n",
 483                         dcdc->name, ret);
 484                 return;
 485         }
 486
 487         /* gpiolib won't let us read the GPIO status so pick the higher
 488          * of the two existing voltages so we take it as platform data.
 489          */
 490         dcdc->dvs_gpio_state = pdata->dvs_init_state;
 491
 492         ret = gpio_direction_output(pdata->dvs_gpio, dcdc->dvs_gpio_state);
 493         if (ret < 0) {
 494                 dev_err(wm831x->dev, "Failed to enable %s DVS GPIO: %d\n",
 495                         dcdc->name, ret);
 496                 gpio_free(pdata->dvs_gpio);
 497                 return;
 498         }
 499
 500         dcdc->dvs_gpio = pdata->dvs_gpio;
 501 }
 502
 503 static __devinit int wm831x_buckv_probe(struct platform_device *pdev)
 504 {
 505         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 506         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
 507         int id;
 508         struct wm831x_dcdc *dcdc;
 509         struct resource *res;
 510         int ret, irq;
 511
 512         if (pdata && pdata->wm831x_num)
 513                 id = (pdata->wm831x_num * 10) + 1;
 514         else
 515                 id = 0;
 516         id = pdev->id - id;
 517
 518         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
 519
 520         if (pdata == NULL || pdata->dcdc[id] == NULL)
 521                 return -ENODEV;
 522
 523         dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
 524         if (dcdc == NULL) {
 525                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 526                 return -ENOMEM;
 527         }
 528
 529         dcdc->wm831x = wm831x;
 530
 531         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 532         if (res == NULL) {
 533                 dev_err(&pdev->dev, "No I/O resource\n");
 534                 ret = -EINVAL;
 535                 goto err;
 536         }
 537         dcdc->base = res->start;
 538
 539         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
 540         dcdc->desc.name = dcdc->name;
 541         dcdc->desc.id = id;
 542         dcdc->desc.type = REGULATOR_VOLTAGE;
 543         dcdc->desc.n_voltages = WM831X_BUCKV_MAX_SELECTOR + 1;
 544         dcdc->desc.ops = &wm831x_buckv_ops;
 545         dcdc->desc.owner = THIS_MODULE;
 546
 547         ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG);
 548         if (ret < 0) {
 549                 dev_err(wm831x->dev, "Failed to read ON VSEL: %d\n", ret);
 550                 goto err;
 551         }
 552         dcdc->on_vsel = ret & WM831X_DC1_ON_VSEL_MASK;
 553
 554         ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL);
 555         if (ret < 0) {
 556                 dev_err(wm831x->dev, "Failed to read DVS VSEL: %d\n", ret);
 557                 goto err;
 558         }
 559         dcdc->dvs_vsel = ret & WM831X_DC1_DVS_VSEL_MASK;
 560
 561         if (pdata->dcdc[id])
 562                 wm831x_buckv_dvs_init(dcdc, pdata->dcdc[id]->driver_data);
 563
 564         dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
 565                                              pdata->dcdc[id], dcdc);
 566         if (IS_ERR(dcdc->regulator)) {
 567                 ret = PTR_ERR(dcdc->regulator);
 568                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
 569                         id + 1, ret);
 570                 goto err;
 571         }
 572
 573         irq = platform_get_irq_byname(pdev, "UV");
 574         ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
 575                                    IRQF_TRIGGER_RISING, dcdc->name, dcdc);
 576         if (ret != 0) {
 577                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
 578                         irq, ret);
 579                 goto err_regulator;
 580         }
 581
 582         irq = platform_get_irq_byname(pdev, "HC");
 583         ret = request_threaded_irq(irq, NULL, wm831x_dcdc_oc_irq,
 584                                    IRQF_TRIGGER_RISING, dcdc->name, dcdc);
 585         if (ret != 0) {
 586                 dev_err(&pdev->dev, "Failed to request HC IRQ %d: %d\n",
 587                         irq, ret);
 588                 goto err_uv;
 589         }
 590
 591         platform_set_drvdata(pdev, dcdc);
 592
 593         return 0;
 594
 595 err_uv:
 596         free_irq(platform_get_irq_byname(pdev, "UV"), dcdc);
 597 err_regulator:
 598         regulator_unregister(dcdc->regulator);
 599 err:
 600         if (dcdc->dvs_gpio)
 601                 gpio_free(dcdc->dvs_gpio);
 602         kfree(dcdc);
 603         return ret;
 604 }
 605
 606 static __devexit int wm831x_buckv_remove(struct platform_device *pdev)
 607 {
 608         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
 609
 610         platform_set_drvdata(pdev, NULL);
 611
 612         free_irq(platform_get_irq_byname(pdev, "HC"), dcdc);
 613         free_irq(platform_get_irq_byname(pdev, "UV"), dcdc);
 614         regulator_unregister(dcdc->regulator);
 615         if (dcdc->dvs_gpio)
 616                 gpio_free(dcdc->dvs_gpio);
 617         kfree(dcdc);
 618
 619         return 0;
 620 }
 621
 622 static struct platform_driver wm831x_buckv_driver = {
 623         .probe = wm831x_buckv_probe,
 624         .remove = __devexit_p(wm831x_buckv_remove),
 625         .driver         = {
 626                 .name   = "wm831x-buckv",
 627                 .owner  = THIS_MODULE,
 628         },
 629 };
 630
 631 /*
 632  * BUCKP specifics
 633  */
 634
 635 static int wm831x_buckp_list_voltage(struct regulator_dev *rdev,
 636                                       unsigned selector)
 637 {
 638         if (selector <= WM831X_BUCKP_MAX_SELECTOR)
 639                 return 850000 + (selector * 25000);
 640         else
 641                 return -EINVAL;
 642 }
 643
 644 static int wm831x_buckp_set_voltage_int(struct regulator_dev *rdev, int reg,
 645                                         int min_uV, int max_uV, int *selector)
 646 {
 647         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 648         struct wm831x *wm831x = dcdc->wm831x;
 649         u16 vsel;
 650
 651         if (min_uV <= 34000000)
 652                 vsel = (min_uV - 850000) / 25000;
 653         else
 654                 return -EINVAL;
 655
 656         if (wm831x_buckp_list_voltage(rdev, vsel) > max_uV)
 657                 return -EINVAL;
 658
 659         *selector = vsel;
 660
 661         return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, vsel);
 662 }
 663
 664 static int wm831x_buckp_set_voltage(struct regulator_dev *rdev,
 665                                     int min_uV, int max_uV,
 666                                     unsigned *selector)
 667 {
 668         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 669         u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
 670
 671         return wm831x_buckp_set_voltage_int(rdev, reg, min_uV, max_uV,
 672                                             selector);
 673 }
 674
 675 static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev,
 676                                             int uV)
 677 {
 678         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 679         u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
 680         unsigned selector;
 681
 682         return wm831x_buckp_set_voltage_int(rdev, reg, uV, uV, &selector);
 683 }
 684
 685 static int wm831x_buckp_get_voltage_sel(struct regulator_dev *rdev)
 686 {
 687         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 688         struct wm831x *wm831x = dcdc->wm831x;
 689         u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
 690         int val;
 691
 692         val = wm831x_reg_read(wm831x, reg);
 693         if (val < 0)
 694                 return val;
 695
 696         return val & WM831X_DC3_ON_VSEL_MASK;
 697 }
 698
 699 static struct regulator_ops wm831x_buckp_ops = {
 700         .set_voltage = wm831x_buckp_set_voltage,
 701         .get_voltage_sel = wm831x_buckp_get_voltage_sel,
 702         .list_voltage = wm831x_buckp_list_voltage,
 703         .set_suspend_voltage = wm831x_buckp_set_suspend_voltage,
 704
 705         .is_enabled = wm831x_dcdc_is_enabled,
 706         .enable = wm831x_dcdc_enable,
 707         .disable = wm831x_dcdc_disable,
 708         .get_status = wm831x_dcdc_get_status,
 709         .get_mode = wm831x_dcdc_get_mode,
 710         .set_mode = wm831x_dcdc_set_mode,
 711         .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
 712 };
 713
 714 static __devinit int wm831x_buckp_probe(struct platform_device *pdev)
 715 {
 716         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 717         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
 718         int id;
 719         struct wm831x_dcdc *dcdc;
 720         struct resource *res;
 721         int ret, irq;
 722
 723         if (pdata && pdata->wm831x_num)
 724                 id = (pdata->wm831x_num * 10) + 1;
 725         else
 726                 id = 0;
 727         id = pdev->id - id;
 728
 729         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
 730
 731         if (pdata == NULL || pdata->dcdc[id] == NULL)
 732                 return -ENODEV;
 733
 734         dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
 735         if (dcdc == NULL) {
 736                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 737                 return -ENOMEM;
 738         }
 739
 740         dcdc->wm831x = wm831x;
 741
 742         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 743         if (res == NULL) {
 744                 dev_err(&pdev->dev, "No I/O resource\n");
 745                 ret = -EINVAL;
 746                 goto err;
 747         }
 748         dcdc->base = res->start;
 749
 750         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
 751         dcdc->desc.name = dcdc->name;
 752         dcdc->desc.id = id;
 753         dcdc->desc.type = REGULATOR_VOLTAGE;
 754         dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1;
 755         dcdc->desc.ops = &wm831x_buckp_ops;
 756         dcdc->desc.owner = THIS_MODULE;
 757
 758         dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
 759                                              pdata->dcdc[id], dcdc);
 760         if (IS_ERR(dcdc->regulator)) {
 761                 ret = PTR_ERR(dcdc->regulator);
 762                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
 763                         id + 1, ret);
 764                 goto err;
 765         }
 766
 767         irq = platform_get_irq_byname(pdev, "UV");
 768         ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
 769                                    IRQF_TRIGGER_RISING, dcdc->name, dcdc);
 770         if (ret != 0) {
 771                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
 772                         irq, ret);
 773                 goto err_regulator;
 774         }
 775
 776         platform_set_drvdata(pdev, dcdc);
 777
 778         return 0;
 779
 780 err_regulator:
 781         regulator_unregister(dcdc->regulator);
 782 err:
 783         kfree(dcdc);
 784         return ret;
 785 }
 786
 787 static __devexit int wm831x_buckp_remove(struct platform_device *pdev)
 788 {
 789         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
 790
 791         platform_set_drvdata(pdev, NULL);
 792
 793         free_irq(platform_get_irq_byname(pdev, "UV"), dcdc);
 794         regulator_unregister(dcdc->regulator);
 795         kfree(dcdc);
 796
 797         return 0;
 798 }
 799
 800 static struct platform_driver wm831x_buckp_driver = {
 801         .probe = wm831x_buckp_probe,
 802         .remove = __devexit_p(wm831x_buckp_remove),
 803         .driver         = {
 804                 .name   = "wm831x-buckp",
 805                 .owner  = THIS_MODULE,
 806         },
 807 };
 808
 809 /*
 810  * DCDC boost convertors
 811  */
 812
 813 static int wm831x_boostp_get_status(struct regulator_dev *rdev)
 814 {
 815         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 816         struct wm831x *wm831x = dcdc->wm831x;
 817         int ret;
 818
 819         /* First, check for errors */
 820         ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
 821         if (ret < 0)
 822                 return ret;
 823
 824         if (ret & (1 << rdev_get_id(rdev))) {
 825                 dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
 826                         rdev_get_id(rdev) + 1);
 827                 return REGULATOR_STATUS_ERROR;
 828         }
 829
 830         /* Is the regulator on? */
 831         ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
 832         if (ret < 0)
 833                 return ret;
 834         if (ret & (1 << rdev_get_id(rdev)))
 835                 return REGULATOR_STATUS_ON;
 836         else
 837                 return REGULATOR_STATUS_OFF;
 838 }
 839
 840 static struct regulator_ops wm831x_boostp_ops = {
 841         .get_status = wm831x_boostp_get_status,
 842
 843         .is_enabled = wm831x_dcdc_is_enabled,
 844         .enable = wm831x_dcdc_enable,
 845         .disable = wm831x_dcdc_disable,
 846 };
 847
 848 static __devinit int wm831x_boostp_probe(struct platform_device *pdev)
 849 {
 850         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 851         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
 852         int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
 853         struct wm831x_dcdc *dcdc;
 854         struct resource *res;
 855         int ret, irq;
 856
 857         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
 858
 859         if (pdata == NULL || pdata->dcdc[id] == NULL)
 860                 return -ENODEV;
 861
 862         dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
 863         if (dcdc == NULL) {
 864                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 865                 return -ENOMEM;
 866         }
 867
 868         dcdc->wm831x = wm831x;
 869
 870         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 871         if (res == NULL) {
 872                 dev_err(&pdev->dev, "No I/O resource\n");
 873                 ret = -EINVAL;
 874                 goto err;
 875         }
 876         dcdc->base = res->start;
 877
 878         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
 879         dcdc->desc.name = dcdc->name;
 880         dcdc->desc.id = id;
 881         dcdc->desc.type = REGULATOR_VOLTAGE;
 882         dcdc->desc.ops = &wm831x_boostp_ops;
 883         dcdc->desc.owner = THIS_MODULE;
 884
 885         dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
 886                                              pdata->dcdc[id], dcdc);
 887         if (IS_ERR(dcdc->regulator)) {
 888                 ret = PTR_ERR(dcdc->regulator);
 889                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
 890                         id + 1, ret);
 891                 goto err;
 892         }
 893
 894         irq = platform_get_irq_byname(pdev, "UV");
 895         ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
 896                                    IRQF_TRIGGER_RISING, dcdc->name,
 897                                    dcdc);
 898         if (ret != 0) {
 899                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
 900                         irq, ret);
 901                 goto err_regulator;
 902         }
 903
 904         platform_set_drvdata(pdev, dcdc);
 905
 906         return 0;
 907
 908 err_regulator:
 909         regulator_unregister(dcdc->regulator);
 910 err:
 911         kfree(dcdc);
 912         return ret;
 913 }
 914
 915 static __devexit int wm831x_boostp_remove(struct platform_device *pdev)
 916 {
 917         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
 918
 919         platform_set_drvdata(pdev, NULL);
 920
 921         free_irq(platform_get_irq_byname(pdev, "UV"), dcdc);
 922         regulator_unregister(dcdc->regulator);
 923         kfree(dcdc);
 924
 925         return 0;
 926 }
 927
 928 static struct platform_driver wm831x_boostp_driver = {
 929         .probe = wm831x_boostp_probe,
 930         .remove = __devexit_p(wm831x_boostp_remove),
 931         .driver         = {
 932                 .name   = "wm831x-boostp",
 933                 .owner  = THIS_MODULE,
 934         },
 935 };
 936
 937 /*
 938  * External Power Enable
 939  *
 940  * These aren't actually DCDCs but look like them in hardware so share
 941  * code.
 942  */
 943
 944 #define WM831X_EPE_BASE 6
 945
 946 static struct regulator_ops wm831x_epe_ops = {
 947         .is_enabled = wm831x_dcdc_is_enabled,
 948         .enable = wm831x_dcdc_enable,
 949         .disable = wm831x_dcdc_disable,
 950         .get_status = wm831x_dcdc_get_status,
 951 };
 952
 953 static __devinit int wm831x_epe_probe(struct platform_device *pdev)
 954 {
 955         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 956         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
 957         int id = pdev->id % ARRAY_SIZE(pdata->epe);
 958         struct wm831x_dcdc *dcdc;
 959         int ret;
 960
 961         dev_dbg(&pdev->dev, "Probing EPE%d\n", id + 1);
 962
 963         if (pdata == NULL || pdata->epe[id] == NULL)
 964                 return -ENODEV;
 965
 966         dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
 967         if (dcdc == NULL) {
 968                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 969                 return -ENOMEM;
 970         }
 971
 972         dcdc->wm831x = wm831x;
 973
 974         /* For current parts this is correct; probably need to revisit
 975          * in future.
 976          */
 977         snprintf(dcdc->name, sizeof(dcdc->name), "EPE%d", id + 1);
 978         dcdc->desc.name = dcdc->name;
 979         dcdc->desc.id = id + WM831X_EPE_BASE; /* Offset in DCDC registers */
 980         dcdc->desc.ops = &wm831x_epe_ops;
 981         dcdc->desc.type = REGULATOR_VOLTAGE;
 982         dcdc->desc.owner = THIS_MODULE;
 983
 984         dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
 985                                              pdata->epe[id], dcdc);
 986         if (IS_ERR(dcdc->regulator)) {
 987                 ret = PTR_ERR(dcdc->regulator);
 988                 dev_err(wm831x->dev, "Failed to register EPE%d: %d\n",
 989                         id + 1, ret);
 990                 goto err;
 991         }
 992
 993         platform_set_drvdata(pdev, dcdc);
 994
 995         return 0;
 996
 997 err:
 998         kfree(dcdc);
 999         return ret;
1000 }
1001
1002 static __devexit int wm831x_epe_remove(struct platform_device *pdev)
1003 {
1004         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
1005
1006         platform_set_drvdata(pdev, NULL);
1007
1008         regulator_unregister(dcdc->regulator);
1009         kfree(dcdc);
1010
1011         return 0;
1012 }
1013
1014 static struct platform_driver wm831x_epe_driver = {
1015         .probe = wm831x_epe_probe,
1016         .remove = __devexit_p(wm831x_epe_remove),
1017         .driver         = {
1018                 .name   = "wm831x-epe",
1019                 .owner  = THIS_MODULE,
1020         },
1021 };
1022
1023 static int __init wm831x_dcdc_init(void)
1024 {
1025         int ret;
1026         ret = platform_driver_register(&wm831x_buckv_driver);
1027         if (ret != 0)
1028                 pr_err("Failed to register WM831x BUCKV driver: %d\n", ret);
1029
1030         ret = platform_driver_register(&wm831x_buckp_driver);
1031         if (ret != 0)
1032                 pr_err("Failed to register WM831x BUCKP driver: %d\n", ret);
1033
1034         ret = platform_driver_register(&wm831x_boostp_driver);
1035         if (ret != 0)
1036                 pr_err("Failed to register WM831x BOOST driver: %d\n", ret);
1037
1038         ret = platform_driver_register(&wm831x_epe_driver);
1039         if (ret != 0)
1040                 pr_err("Failed to register WM831x EPE driver: %d\n", ret);
1041
1042         return 0;
1043 }
1044 subsys_initcall(wm831x_dcdc_init);
1045
1046 static void __exit wm831x_dcdc_exit(void)
1047 {
1048         platform_driver_unregister(&wm831x_epe_driver);
1049         platform_driver_unregister(&wm831x_boostp_driver);
1050         platform_driver_unregister(&wm831x_buckp_driver);
1051         platform_driver_unregister(&wm831x_buckv_driver);
1052 }
1053 module_exit(wm831x_dcdc_exit);
1054
1055 /* Module information */
1056 MODULE_AUTHOR("Mark Brown");
1057 MODULE_DESCRIPTION("WM831x DC-DC convertor driver");
1058 MODULE_LICENSE("GPL");
1059 MODULE_ALIAS("platform:wm831x-buckv");
1060 MODULE_ALIAS("platform:wm831x-buckp");