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 = pdev->id % ARRAY_SIZE(pdata->dcdc);
 508         struct wm831x_dcdc *dcdc;
 509         struct resource *res;
 510         int ret, irq;
 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 = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
 518         if (dcdc == NULL) {
 519                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 520                 return -ENOMEM;
 521         }
 522
 523         dcdc->wm831x = wm831x;
 524
 525         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 526         if (res == NULL) {
 527                 dev_err(&pdev->dev, "No I/O resource\n");
 528                 ret = -EINVAL;
 529                 goto err;
 530         }
 531         dcdc->base = res->start;
 532
 533         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
 534         dcdc->desc.name = dcdc->name;
 535         dcdc->desc.id = id;
 536         dcdc->desc.type = REGULATOR_VOLTAGE;
 537         dcdc->desc.n_voltages = WM831X_BUCKV_MAX_SELECTOR + 1;
 538         dcdc->desc.ops = &wm831x_buckv_ops;
 539         dcdc->desc.owner = THIS_MODULE;
 540
 541         ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG);
 542         if (ret < 0) {
 543                 dev_err(wm831x->dev, "Failed to read ON VSEL: %d\n", ret);
 544                 goto err;
 545         }
 546         dcdc->on_vsel = ret & WM831X_DC1_ON_VSEL_MASK;
 547
 548         ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG);
 549         if (ret < 0) {
 550                 dev_err(wm831x->dev, "Failed to read DVS VSEL: %d\n", ret);
 551                 goto err;
 552         }
 553         dcdc->dvs_vsel = ret & WM831X_DC1_DVS_VSEL_MASK;
 554
 555         if (pdata->dcdc[id])
 556                 wm831x_buckv_dvs_init(dcdc, pdata->dcdc[id]->driver_data);
 557
 558         dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
 559                                              pdata->dcdc[id], dcdc);
 560         if (IS_ERR(dcdc->regulator)) {
 561                 ret = PTR_ERR(dcdc->regulator);
 562                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
 563                         id + 1, ret);
 564                 goto err;
 565         }
 566
 567         irq = platform_get_irq_byname(pdev, "UV");
 568         ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_uv_irq,
 569                                  IRQF_TRIGGER_RISING, dcdc->name,
 570                                  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 = wm831x_request_irq(wm831x, irq, wm831x_dcdc_oc_irq,
 579                                  IRQF_TRIGGER_RISING, dcdc->name,
 580                                  dcdc);
 581         if (ret != 0) {
 582                 dev_err(&pdev->dev, "Failed to request HC IRQ %d: %d\n",
 583                         irq, ret);
 584                 goto err_uv;
 585         }
 586
 587         platform_set_drvdata(pdev, dcdc);
 588
 589         return 0;
 590
 591 err_uv:
 592         wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc);
 593 err_regulator:
 594         regulator_unregister(dcdc->regulator);
 595 err:
 596         if (dcdc->dvs_gpio)
 597                 gpio_free(dcdc->dvs_gpio);
 598         kfree(dcdc);
 599         return ret;
 600 }
 601
 602 static __devexit int wm831x_buckv_remove(struct platform_device *pdev)
 603 {
 604         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
 605         struct wm831x *wm831x = dcdc->wm831x;
 606
 607         platform_set_drvdata(pdev, NULL);
 608
 609         wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "HC"), dcdc);
 610         wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc);
 611         regulator_unregister(dcdc->regulator);
 612         if (dcdc->dvs_gpio)
 613                 gpio_free(dcdc->dvs_gpio);
 614         kfree(dcdc);
 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 = pdev->id % ARRAY_SIZE(pdata->dcdc);
 716         struct wm831x_dcdc *dcdc;
 717         struct resource *res;
 718         int ret, irq;
 719
 720         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
 721
 722         if (pdata == NULL || pdata->dcdc[id] == NULL)
 723                 return -ENODEV;
 724
 725         dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
 726         if (dcdc == NULL) {
 727                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 728                 return -ENOMEM;
 729         }
 730
 731         dcdc->wm831x = wm831x;
 732
 733         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 734         if (res == NULL) {
 735                 dev_err(&pdev->dev, "No I/O resource\n");
 736                 ret = -EINVAL;
 737                 goto err;
 738         }
 739         dcdc->base = res->start;
 740
 741         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
 742         dcdc->desc.name = dcdc->name;
 743         dcdc->desc.id = id;
 744         dcdc->desc.type = REGULATOR_VOLTAGE;
 745         dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1;
 746         dcdc->desc.ops = &wm831x_buckp_ops;
 747         dcdc->desc.owner = THIS_MODULE;
 748
 749         dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
 750                                              pdata->dcdc[id], dcdc);
 751         if (IS_ERR(dcdc->regulator)) {
 752                 ret = PTR_ERR(dcdc->regulator);
 753                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
 754                         id + 1, ret);
 755                 goto err;
 756         }
 757
 758         irq = platform_get_irq_byname(pdev, "UV");
 759         ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_uv_irq,
 760                                  IRQF_TRIGGER_RISING, dcdc->name,
 761                                  dcdc);
 762         if (ret != 0) {
 763                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
 764                         irq, ret);
 765                 goto err_regulator;
 766         }
 767
 768         platform_set_drvdata(pdev, dcdc);
 769
 770         return 0;
 771
 772 err_regulator:
 773         regulator_unregister(dcdc->regulator);
 774 err:
 775         kfree(dcdc);
 776         return ret;
 777 }
 778
 779 static __devexit int wm831x_buckp_remove(struct platform_device *pdev)
 780 {
 781         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
 782         struct wm831x *wm831x = dcdc->wm831x;
 783
 784         platform_set_drvdata(pdev, NULL);
 785
 786         wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc);
 787         regulator_unregister(dcdc->regulator);
 788         kfree(dcdc);
 789
 790         return 0;
 791 }
 792
 793 static struct platform_driver wm831x_buckp_driver = {
 794         .probe = wm831x_buckp_probe,
 795         .remove = __devexit_p(wm831x_buckp_remove),
 796         .driver         = {
 797                 .name   = "wm831x-buckp",
 798                 .owner  = THIS_MODULE,
 799         },
 800 };
 801
 802 /*
 803  * DCDC boost convertors
 804  */
 805
 806 static int wm831x_boostp_get_status(struct regulator_dev *rdev)
 807 {
 808         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 809         struct wm831x *wm831x = dcdc->wm831x;
 810         int ret;
 811
 812         /* First, check for errors */
 813         ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
 814         if (ret < 0)
 815                 return ret;
 816
 817         if (ret & (1 << rdev_get_id(rdev))) {
 818                 dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
 819                         rdev_get_id(rdev) + 1);
 820                 return REGULATOR_STATUS_ERROR;
 821         }
 822
 823         /* Is the regulator on? */
 824         ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
 825         if (ret < 0)
 826                 return ret;
 827         if (ret & (1 << rdev_get_id(rdev)))
 828                 return REGULATOR_STATUS_ON;
 829         else
 830                 return REGULATOR_STATUS_OFF;
 831 }
 832
 833 static struct regulator_ops wm831x_boostp_ops = {
 834         .get_status = wm831x_boostp_get_status,
 835
 836         .is_enabled = wm831x_dcdc_is_enabled,
 837         .enable = wm831x_dcdc_enable,
 838         .disable = wm831x_dcdc_disable,
 839 };
 840
 841 static __devinit int wm831x_boostp_probe(struct platform_device *pdev)
 842 {
 843         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 844         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
 845         int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
 846         struct wm831x_dcdc *dcdc;
 847         struct resource *res;
 848         int ret, irq;
 849
 850         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
 851
 852         if (pdata == NULL || pdata->dcdc[id] == NULL)
 853                 return -ENODEV;
 854
 855         dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
 856         if (dcdc == NULL) {
 857                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 858                 return -ENOMEM;
 859         }
 860
 861         dcdc->wm831x = wm831x;
 862
 863         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 864         if (res == NULL) {
 865                 dev_err(&pdev->dev, "No I/O resource\n");
 866                 ret = -EINVAL;
 867                 goto err;
 868         }
 869         dcdc->base = res->start;
 870
 871         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
 872         dcdc->desc.name = dcdc->name;
 873         dcdc->desc.id = id;
 874         dcdc->desc.type = REGULATOR_VOLTAGE;
 875         dcdc->desc.ops = &wm831x_boostp_ops;
 876         dcdc->desc.owner = THIS_MODULE;
 877
 878         dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
 879                                              pdata->dcdc[id], dcdc);
 880         if (IS_ERR(dcdc->regulator)) {
 881                 ret = PTR_ERR(dcdc->regulator);
 882                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
 883                         id + 1, ret);
 884                 goto err;
 885         }
 886
 887         irq = platform_get_irq_byname(pdev, "UV");
 888         ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_uv_irq,
 889                                  IRQF_TRIGGER_RISING, dcdc->name,
 890                                  dcdc);
 891         if (ret != 0) {
 892                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
 893                         irq, ret);
 894                 goto err_regulator;
 895         }
 896
 897         platform_set_drvdata(pdev, dcdc);
 898
 899         return 0;
 900
 901 err_regulator:
 902         regulator_unregister(dcdc->regulator);
 903 err:
 904         kfree(dcdc);
 905         return ret;
 906 }
 907
 908 static __devexit int wm831x_boostp_remove(struct platform_device *pdev)
 909 {
 910         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
 911         struct wm831x *wm831x = dcdc->wm831x;
 912
 913         platform_set_drvdata(pdev, NULL);
 914
 915         wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc);
 916         regulator_unregister(dcdc->regulator);
 917         kfree(dcdc);
 918
 919         return 0;
 920 }
 921
 922 static struct platform_driver wm831x_boostp_driver = {
 923         .probe = wm831x_boostp_probe,
 924         .remove = __devexit_p(wm831x_boostp_remove),
 925         .driver         = {
 926                 .name   = "wm831x-boostp",
 927                 .owner  = THIS_MODULE,
 928         },
 929 };
 930
 931 /*
 932  * External Power Enable
 933  *
 934  * These aren't actually DCDCs but look like them in hardware so share
 935  * code.
 936  */
 937
 938 #define WM831X_EPE_BASE 6
 939
 940 static struct regulator_ops wm831x_epe_ops = {
 941         .is_enabled = wm831x_dcdc_is_enabled,
 942         .enable = wm831x_dcdc_enable,
 943         .disable = wm831x_dcdc_disable,
 944         .get_status = wm831x_dcdc_get_status,
 945 };
 946
 947 static __devinit int wm831x_epe_probe(struct platform_device *pdev)
 948 {
 949         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 950         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
 951         int id = pdev->id % ARRAY_SIZE(pdata->epe);
 952         struct wm831x_dcdc *dcdc;
 953         int ret;
 954
 955         dev_dbg(&pdev->dev, "Probing EPE%d\n", id + 1);
 956
 957         if (pdata == NULL || pdata->epe[id] == NULL)
 958                 return -ENODEV;
 959
 960         dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
 961         if (dcdc == NULL) {
 962                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 963                 return -ENOMEM;
 964         }
 965
 966         dcdc->wm831x = wm831x;
 967
 968         /* For current parts this is correct; probably need to revisit
 969          * in future.
 970          */
 971         snprintf(dcdc->name, sizeof(dcdc->name), "EPE%d", id + 1);
 972         dcdc->desc.name = dcdc->name;
 973         dcdc->desc.id = id + WM831X_EPE_BASE; /* Offset in DCDC registers */
 974         dcdc->desc.ops = &wm831x_epe_ops;
 975         dcdc->desc.type = REGULATOR_VOLTAGE;
 976         dcdc->desc.owner = THIS_MODULE;
 977
 978         dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
 979                                              pdata->epe[id], dcdc);
 980         if (IS_ERR(dcdc->regulator)) {
 981                 ret = PTR_ERR(dcdc->regulator);
 982                 dev_err(wm831x->dev, "Failed to register EPE%d: %d\n",
 983                         id + 1, ret);
 984                 goto err;
 985         }
 986
 987         platform_set_drvdata(pdev, dcdc);
 988
 989         return 0;
 990
 991 err:
 992         kfree(dcdc);
 993         return ret;
 994 }
 995
 996 static __devexit int wm831x_epe_remove(struct platform_device *pdev)
 997 {
 998         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
 999
1000         platform_set_drvdata(pdev, NULL);
1001
1002         regulator_unregister(dcdc->regulator);
1003         kfree(dcdc);
1004
1005         return 0;
1006 }
1007
1008 static struct platform_driver wm831x_epe_driver = {
1009         .probe = wm831x_epe_probe,
1010         .remove = __devexit_p(wm831x_epe_remove),
1011         .driver         = {
1012                 .name   = "wm831x-epe",
1013                 .owner  = THIS_MODULE,
1014         },
1015 };
1016
1017 static int __init wm831x_dcdc_init(void)
1018 {
1019         int ret;
1020         ret = platform_driver_register(&wm831x_buckv_driver);
1021         if (ret != 0)
1022                 pr_err("Failed to register WM831x BUCKV driver: %d\n", ret);
1023
1024         ret = platform_driver_register(&wm831x_buckp_driver);
1025         if (ret != 0)
1026                 pr_err("Failed to register WM831x BUCKP driver: %d\n", ret);
1027
1028         ret = platform_driver_register(&wm831x_boostp_driver);
1029         if (ret != 0)
1030                 pr_err("Failed to register WM831x BOOST driver: %d\n", ret);
1031
1032         ret = platform_driver_register(&wm831x_epe_driver);
1033         if (ret != 0)
1034                 pr_err("Failed to register WM831x EPE driver: %d\n", ret);
1035
1036         return 0;
1037 }
1038 subsys_initcall(wm831x_dcdc_init);
1039
1040 static void __exit wm831x_dcdc_exit(void)
1041 {
1042         platform_driver_unregister(&wm831x_epe_driver);
1043         platform_driver_unregister(&wm831x_boostp_driver);
1044         platform_driver_unregister(&wm831x_buckp_driver);
1045         platform_driver_unregister(&wm831x_buckv_driver);
1046 }
1047 module_exit(wm831x_dcdc_exit);
1048
1049 /* Module information */
1050 MODULE_AUTHOR("Mark Brown");
1051 MODULE_DESCRIPTION("WM831x DC-DC convertor driver");
1052 MODULE_LICENSE("GPL");
1053 MODULE_ALIAS("platform:wm831x-buckv");
1054 MODULE_ALIAS("platform:wm831x-buckp");