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         }
 124 }
 125
 126 static int wm831x_dcdc_set_mode_int(struct wm831x *wm831x, int reg,
 127                                     unsigned int mode)
 128 {
 129         int val;
 130
 131         switch (mode) {
 132         case REGULATOR_MODE_FAST:
 133                 val = WM831X_DCDC_MODE_FAST;
 134                 break;
 135         case REGULATOR_MODE_NORMAL:
 136                 val = WM831X_DCDC_MODE_NORMAL;
 137                 break;
 138         case REGULATOR_MODE_STANDBY:
 139                 val = WM831X_DCDC_MODE_STANDBY;
 140                 break;
 141         case REGULATOR_MODE_IDLE:
 142                 val = WM831X_DCDC_MODE_IDLE;
 143                 break;
 144         default:
 145                 return -EINVAL;
 146         }
 147
 148         return wm831x_set_bits(wm831x, reg, WM831X_DC1_ON_MODE_MASK,
 149                                val << WM831X_DC1_ON_MODE_SHIFT);
 150 }
 151
 152 static int wm831x_dcdc_set_mode(struct regulator_dev *rdev, unsigned int mode)
 153 {
 154         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 155         struct wm831x *wm831x = dcdc->wm831x;
 156         u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
 157
 158         return wm831x_dcdc_set_mode_int(wm831x, reg, mode);
 159 }
 160
 161 static int wm831x_dcdc_set_suspend_mode(struct regulator_dev *rdev,
 162                                         unsigned int mode)
 163 {
 164         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 165         struct wm831x *wm831x = dcdc->wm831x;
 166         u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
 167
 168         return wm831x_dcdc_set_mode_int(wm831x, reg, mode);
 169 }
 170
 171 static int wm831x_dcdc_get_status(struct regulator_dev *rdev)
 172 {
 173         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 174         struct wm831x *wm831x = dcdc->wm831x;
 175         int ret;
 176
 177         /* First, check for errors */
 178         ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
 179         if (ret < 0)
 180                 return ret;
 181
 182         if (ret & (1 << rdev_get_id(rdev))) {
 183                 dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
 184                         rdev_get_id(rdev) + 1);
 185                 return REGULATOR_STATUS_ERROR;
 186         }
 187
 188         /* DCDC1 and DCDC2 can additionally detect high voltage/current */
 189         if (rdev_get_id(rdev) < 2) {
 190                 if (ret & (WM831X_DC1_OV_STS << rdev_get_id(rdev))) {
 191                         dev_dbg(wm831x->dev, "DCDC%d over voltage\n",
 192                                 rdev_get_id(rdev) + 1);
 193                         return REGULATOR_STATUS_ERROR;
 194                 }
 195
 196                 if (ret & (WM831X_DC1_HC_STS << rdev_get_id(rdev))) {
 197                         dev_dbg(wm831x->dev, "DCDC%d over current\n",
 198                                 rdev_get_id(rdev) + 1);
 199                         return REGULATOR_STATUS_ERROR;
 200                 }
 201         }
 202
 203         /* Is the regulator on? */
 204         ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
 205         if (ret < 0)
 206                 return ret;
 207         if (!(ret & (1 << rdev_get_id(rdev))))
 208                 return REGULATOR_STATUS_OFF;
 209
 210         /* TODO: When we handle hardware control modes so we can report the
 211          * current mode. */
 212         return REGULATOR_STATUS_ON;
 213 }
 214
 215 static irqreturn_t wm831x_dcdc_uv_irq(int irq, void *data)
 216 {
 217         struct wm831x_dcdc *dcdc = data;
 218
 219         regulator_notifier_call_chain(dcdc->regulator,
 220                                       REGULATOR_EVENT_UNDER_VOLTAGE,
 221                                       NULL);
 222
 223         return IRQ_HANDLED;
 224 }
 225
 226 static irqreturn_t wm831x_dcdc_oc_irq(int irq, void *data)
 227 {
 228         struct wm831x_dcdc *dcdc = data;
 229
 230         regulator_notifier_call_chain(dcdc->regulator,
 231                                       REGULATOR_EVENT_OVER_CURRENT,
 232                                       NULL);
 233
 234         return IRQ_HANDLED;
 235 }
 236
 237 /*
 238  * BUCKV specifics
 239  */
 240
 241 static int wm831x_buckv_list_voltage(struct regulator_dev *rdev,
 242                                       unsigned selector)
 243 {
 244         if (selector <= 0x8)
 245                 return 600000;
 246         if (selector <= WM831X_BUCKV_MAX_SELECTOR)
 247                 return 600000 + ((selector - 0x8) * 12500);
 248         return -EINVAL;
 249 }
 250
 251 static int wm831x_buckv_select_min_voltage(struct regulator_dev *rdev,
 252                                            int min_uV, int max_uV)
 253 {
 254         u16 vsel;
 255
 256         if (min_uV < 600000)
 257                 vsel = 0;
 258         else if (min_uV <= 1800000)
 259                 vsel = ((min_uV - 600000) / 12500) + 8;
 260         else
 261                 return -EINVAL;
 262
 263         if (wm831x_buckv_list_voltage(rdev, vsel) > max_uV)
 264                 return -EINVAL;
 265
 266         return vsel;
 267 }
 268
 269 static int wm831x_buckv_select_max_voltage(struct regulator_dev *rdev,
 270                                            int min_uV, int max_uV)
 271 {
 272         u16 vsel;
 273
 274         if (max_uV < 600000 || max_uV > 1800000)
 275                 return -EINVAL;
 276
 277         vsel = ((max_uV - 600000) / 12500) + 8;
 278
 279         if (wm831x_buckv_list_voltage(rdev, vsel) < min_uV ||
 280             wm831x_buckv_list_voltage(rdev, vsel) < max_uV)
 281                 return -EINVAL;
 282
 283         return vsel;
 284 }
 285
 286 static int wm831x_buckv_set_dvs(struct regulator_dev *rdev, int state)
 287 {
 288         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 289
 290         if (state == dcdc->dvs_gpio_state)
 291                 return 0;
 292
 293         dcdc->dvs_gpio_state = state;
 294         gpio_set_value(dcdc->dvs_gpio, state);
 295
 296         /* Should wait for DVS state change to be asserted if we have
 297          * a GPIO for it, for now assume the device is configured
 298          * for the fastest possible transition.
 299          */
 300
 301         return 0;
 302 }
 303
 304 static int wm831x_buckv_set_voltage(struct regulator_dev *rdev,
 305                                     int min_uV, int max_uV, unsigned *selector)
 306 {
 307         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 308         struct wm831x *wm831x = dcdc->wm831x;
 309         int on_reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
 310         int dvs_reg = dcdc->base + WM831X_DCDC_DVS_CONTROL;
 311         int vsel, ret;
 312
 313         vsel = wm831x_buckv_select_min_voltage(rdev, min_uV, max_uV);
 314         if (vsel < 0)
 315                 return vsel;
 316
 317         *selector = vsel;
 318
 319         /* If this value is already set then do a GPIO update if we can */
 320         if (dcdc->dvs_gpio && dcdc->on_vsel == vsel)
 321                 return wm831x_buckv_set_dvs(rdev, 0);
 322
 323         if (dcdc->dvs_gpio && dcdc->dvs_vsel == vsel)
 324                 return wm831x_buckv_set_dvs(rdev, 1);
 325
 326         /* Always set the ON status to the minimum voltage */
 327         ret = wm831x_set_bits(wm831x, on_reg, WM831X_DC1_ON_VSEL_MASK, vsel);
 328         if (ret < 0)
 329                 return ret;
 330         dcdc->on_vsel = vsel;
 331
 332         if (!dcdc->dvs_gpio)
 333                 return ret;
 334
 335         /* Kick the voltage transition now */
 336         ret = wm831x_buckv_set_dvs(rdev, 0);
 337         if (ret < 0)
 338                 return ret;
 339
 340         /* Set the high voltage as the DVS voltage.  This is optimised
 341          * for CPUfreq usage, most processors will keep the maximum
 342          * voltage constant and lower the minimum with the frequency. */
 343         vsel = wm831x_buckv_select_max_voltage(rdev, min_uV, max_uV);
 344         if (vsel < 0) {
 345                 /* This should never happen - at worst the same vsel
 346                  * should be chosen */
 347                 WARN_ON(vsel < 0);
 348                 return 0;
 349         }
 350
 351         /* Don't bother if it's the same VSEL we're already using */
 352         if (vsel == dcdc->on_vsel)
 353                 return 0;
 354
 355         ret = wm831x_set_bits(wm831x, dvs_reg, WM831X_DC1_DVS_VSEL_MASK, vsel);
 356         if (ret == 0)
 357                 dcdc->dvs_vsel = vsel;
 358         else
 359                 dev_warn(wm831x->dev, "Failed to set DCDC DVS VSEL: %d\n",
 360                          ret);
 361
 362         return 0;
 363 }
 364
 365 static int wm831x_buckv_set_suspend_voltage(struct regulator_dev *rdev,
 366                                             int uV)
 367 {
 368         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 369         struct wm831x *wm831x = dcdc->wm831x;
 370         u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
 371         int vsel;
 372
 373         vsel = wm831x_buckv_select_min_voltage(rdev, uV, uV);
 374         if (vsel < 0)
 375                 return vsel;
 376
 377         return wm831x_set_bits(wm831x, reg, WM831X_DC1_SLP_VSEL_MASK, vsel);
 378 }
 379
 380 static int wm831x_buckv_get_voltage_sel(struct regulator_dev *rdev)
 381 {
 382         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 383
 384         if (dcdc->dvs_gpio && dcdc->dvs_gpio_state)
 385                 return dcdc->dvs_vsel;
 386         else
 387                 return dcdc->on_vsel;
 388 }
 389
 390 /* Current limit options */
 391 static u16 wm831x_dcdc_ilim[] = {
 392         125, 250, 375, 500, 625, 750, 875, 1000
 393 };
 394
 395 static int wm831x_buckv_set_current_limit(struct regulator_dev *rdev,
 396                                            int min_uA, int max_uA)
 397 {
 398         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 399         struct wm831x *wm831x = dcdc->wm831x;
 400         u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2;
 401         int i;
 402
 403         for (i = 0; i < ARRAY_SIZE(wm831x_dcdc_ilim); i++) {
 404                 if (max_uA <= wm831x_dcdc_ilim[i])
 405                         break;
 406         }
 407         if (i == ARRAY_SIZE(wm831x_dcdc_ilim))
 408                 return -EINVAL;
 409
 410         return wm831x_set_bits(wm831x, reg, WM831X_DC1_HC_THR_MASK, i);
 411 }
 412
 413 static int wm831x_buckv_get_current_limit(struct regulator_dev *rdev)
 414 {
 415         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 416         struct wm831x *wm831x = dcdc->wm831x;
 417         u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2;
 418         int val;
 419
 420         val = wm831x_reg_read(wm831x, reg);
 421         if (val < 0)
 422                 return val;
 423
 424         return wm831x_dcdc_ilim[val & WM831X_DC1_HC_THR_MASK];
 425 }
 426
 427 static struct regulator_ops wm831x_buckv_ops = {
 428         .set_voltage = wm831x_buckv_set_voltage,
 429         .get_voltage_sel = wm831x_buckv_get_voltage_sel,
 430         .list_voltage = wm831x_buckv_list_voltage,
 431         .set_suspend_voltage = wm831x_buckv_set_suspend_voltage,
 432         .set_current_limit = wm831x_buckv_set_current_limit,
 433         .get_current_limit = wm831x_buckv_get_current_limit,
 434
 435         .is_enabled = wm831x_dcdc_is_enabled,
 436         .enable = wm831x_dcdc_enable,
 437         .disable = wm831x_dcdc_disable,
 438         .get_status = wm831x_dcdc_get_status,
 439         .get_mode = wm831x_dcdc_get_mode,
 440         .set_mode = wm831x_dcdc_set_mode,
 441         .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
 442 };
 443
 444 /*
 445  * Set up DVS control.  We just log errors since we can still run
 446  * (with reduced performance) if we fail.
 447  */
 448 static __devinit void wm831x_buckv_dvs_init(struct wm831x_dcdc *dcdc,
 449                                             struct wm831x_buckv_pdata *pdata)
 450 {
 451         struct wm831x *wm831x = dcdc->wm831x;
 452         int ret;
 453         u16 ctrl;
 454
 455         if (!pdata || !pdata->dvs_gpio)
 456                 return;
 457
 458         switch (pdata->dvs_control_src) {
 459         case 1:
 460                 ctrl = 2 << WM831X_DC1_DVS_SRC_SHIFT;
 461                 break;
 462         case 2:
 463                 ctrl = 3 << WM831X_DC1_DVS_SRC_SHIFT;
 464                 break;
 465         default:
 466                 dev_err(wm831x->dev, "Invalid DVS control source %d for %s\n",
 467                         pdata->dvs_control_src, dcdc->name);
 468                 return;
 469         }
 470
 471         ret = wm831x_set_bits(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL,
 472                               WM831X_DC1_DVS_SRC_MASK, ctrl);
 473         if (ret < 0) {
 474                 dev_err(wm831x->dev, "Failed to set %s DVS source: %d\n",
 475                         dcdc->name, ret);
 476                 return;
 477         }
 478
 479         ret = gpio_request(pdata->dvs_gpio, "DCDC DVS");
 480         if (ret < 0) {
 481                 dev_err(wm831x->dev, "Failed to get %s DVS GPIO: %d\n",
 482                         dcdc->name, ret);
 483                 return;
 484         }
 485
 486         /* gpiolib won't let us read the GPIO status so pick the higher
 487          * of the two existing voltages so we take it as platform data.
 488          */
 489         dcdc->dvs_gpio_state = pdata->dvs_init_state;
 490
 491         ret = gpio_direction_output(pdata->dvs_gpio, dcdc->dvs_gpio_state);
 492         if (ret < 0) {
 493                 dev_err(wm831x->dev, "Failed to enable %s DVS GPIO: %d\n",
 494                         dcdc->name, ret);
 495                 gpio_free(pdata->dvs_gpio);
 496                 return;
 497         }
 498
 499         dcdc->dvs_gpio = pdata->dvs_gpio;
 500 }
 501
 502 static __devinit int wm831x_buckv_probe(struct platform_device *pdev)
 503 {
 504         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 505         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
 506         int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
 507         struct wm831x_dcdc *dcdc;
 508         struct resource *res;
 509         int ret, irq;
 510
 511         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
 512
 513         if (pdata == NULL || pdata->dcdc[id] == NULL)
 514                 return -ENODEV;
 515
 516         dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
 517         if (dcdc == NULL) {
 518                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 519                 return -ENOMEM;
 520         }
 521
 522         dcdc->wm831x = wm831x;
 523
 524         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 525         if (res == NULL) {
 526                 dev_err(&pdev->dev, "No I/O resource\n");
 527                 ret = -EINVAL;
 528                 goto err;
 529         }
 530         dcdc->base = res->start;
 531
 532         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
 533         dcdc->desc.name = dcdc->name;
 534         dcdc->desc.id = id;
 535         dcdc->desc.type = REGULATOR_VOLTAGE;
 536         dcdc->desc.n_voltages = WM831X_BUCKV_MAX_SELECTOR + 1;
 537         dcdc->desc.ops = &wm831x_buckv_ops;
 538         dcdc->desc.owner = THIS_MODULE;
 539
 540         ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG);
 541         if (ret < 0) {
 542                 dev_err(wm831x->dev, "Failed to read ON VSEL: %d\n", ret);
 543                 goto err;
 544         }
 545         dcdc->on_vsel = ret & WM831X_DC1_ON_VSEL_MASK;
 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 DVS VSEL: %d\n", ret);
 550                 goto err;
 551         }
 552         dcdc->dvs_vsel = ret & WM831X_DC1_DVS_VSEL_MASK;
 553
 554         if (pdata->dcdc[id])
 555                 wm831x_buckv_dvs_init(dcdc, pdata->dcdc[id]->driver_data);
 556
 557         dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
 558                                              pdata->dcdc[id], dcdc);
 559         if (IS_ERR(dcdc->regulator)) {
 560                 ret = PTR_ERR(dcdc->regulator);
 561                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
 562                         id + 1, ret);
 563                 goto err;
 564         }
 565
 566         irq = platform_get_irq_byname(pdev, "UV");
 567         ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_uv_irq,
 568                                  IRQF_TRIGGER_RISING, dcdc->name,
 569                                  dcdc);
 570         if (ret != 0) {
 571                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
 572                         irq, ret);
 573                 goto err_regulator;
 574         }
 575
 576         irq = platform_get_irq_byname(pdev, "HC");
 577         ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_oc_irq,
 578                                  IRQF_TRIGGER_RISING, dcdc->name,
 579                                  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         wm831x_free_irq(wm831x, 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         kfree(dcdc);
 598         return ret;
 599 }
 600
 601 static __devexit int wm831x_buckv_remove(struct platform_device *pdev)
 602 {
 603         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
 604         struct wm831x *wm831x = dcdc->wm831x;
 605
 606         platform_set_drvdata(pdev, NULL);
 607
 608         wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "HC"), dcdc);
 609         wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc);
 610         regulator_unregister(dcdc->regulator);
 611         if (dcdc->dvs_gpio)
 612                 gpio_free(dcdc->dvs_gpio);
 613         kfree(dcdc);
 614
 615         return 0;
 616 }
 617
 618 static struct platform_driver wm831x_buckv_driver = {
 619         .probe = wm831x_buckv_probe,
 620         .remove = __devexit_p(wm831x_buckv_remove),
 621         .driver         = {
 622                 .name   = "wm831x-buckv",
 623                 .owner  = THIS_MODULE,
 624         },
 625 };
 626
 627 /*
 628  * BUCKP specifics
 629  */
 630
 631 static int wm831x_buckp_list_voltage(struct regulator_dev *rdev,
 632                                       unsigned selector)
 633 {
 634         if (selector <= WM831X_BUCKP_MAX_SELECTOR)
 635                 return 850000 + (selector * 25000);
 636         else
 637                 return -EINVAL;
 638 }
 639
 640 static int wm831x_buckp_set_voltage_int(struct regulator_dev *rdev, int reg,
 641                                         int min_uV, int max_uV, int *selector)
 642 {
 643         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 644         struct wm831x *wm831x = dcdc->wm831x;
 645         u16 vsel;
 646
 647         if (min_uV <= 34000000)
 648                 vsel = (min_uV - 850000) / 25000;
 649         else
 650                 return -EINVAL;
 651
 652         if (wm831x_buckp_list_voltage(rdev, vsel) > max_uV)
 653                 return -EINVAL;
 654
 655         *selector = vsel;
 656
 657         return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, vsel);
 658 }
 659
 660 static int wm831x_buckp_set_voltage(struct regulator_dev *rdev,
 661                                     int min_uV, int max_uV,
 662                                     unsigned *selector)
 663 {
 664         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 665         u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
 666
 667         return wm831x_buckp_set_voltage_int(rdev, reg, min_uV, max_uV,
 668                                             selector);
 669 }
 670
 671 static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev,
 672                                             int uV)
 673 {
 674         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 675         u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
 676         unsigned selector;
 677
 678         return wm831x_buckp_set_voltage_int(rdev, reg, uV, uV, &selector);
 679 }
 680
 681 static int wm831x_buckp_get_voltage_sel(struct regulator_dev *rdev)
 682 {
 683         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 684         struct wm831x *wm831x = dcdc->wm831x;
 685         u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
 686         int val;
 687
 688         val = wm831x_reg_read(wm831x, reg);
 689         if (val < 0)
 690                 return val;
 691
 692         return val & WM831X_DC3_ON_VSEL_MASK;
 693 }
 694
 695 static struct regulator_ops wm831x_buckp_ops = {
 696         .set_voltage = wm831x_buckp_set_voltage,
 697         .get_voltage_sel = wm831x_buckp_get_voltage_sel,
 698         .list_voltage = wm831x_buckp_list_voltage,
 699         .set_suspend_voltage = wm831x_buckp_set_suspend_voltage,
 700
 701         .is_enabled = wm831x_dcdc_is_enabled,
 702         .enable = wm831x_dcdc_enable,
 703         .disable = wm831x_dcdc_disable,
 704         .get_status = wm831x_dcdc_get_status,
 705         .get_mode = wm831x_dcdc_get_mode,
 706         .set_mode = wm831x_dcdc_set_mode,
 707         .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
 708 };
 709
 710 static __devinit int wm831x_buckp_probe(struct platform_device *pdev)
 711 {
 712         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 713         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
 714         int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
 715         struct wm831x_dcdc *dcdc;
 716         struct resource *res;
 717         int ret, irq;
 718
 719         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
 720
 721         if (pdata == NULL || pdata->dcdc[id] == NULL)
 722                 return -ENODEV;
 723
 724         dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
 725         if (dcdc == NULL) {
 726                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 727                 return -ENOMEM;
 728         }
 729
 730         dcdc->wm831x = wm831x;
 731
 732         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 733         if (res == NULL) {
 734                 dev_err(&pdev->dev, "No I/O resource\n");
 735                 ret = -EINVAL;
 736                 goto err;
 737         }
 738         dcdc->base = res->start;
 739
 740         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
 741         dcdc->desc.name = dcdc->name;
 742         dcdc->desc.id = id;
 743         dcdc->desc.type = REGULATOR_VOLTAGE;
 744         dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1;
 745         dcdc->desc.ops = &wm831x_buckp_ops;
 746         dcdc->desc.owner = THIS_MODULE;
 747
 748         dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
 749                                              pdata->dcdc[id], dcdc);
 750         if (IS_ERR(dcdc->regulator)) {
 751                 ret = PTR_ERR(dcdc->regulator);
 752                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
 753                         id + 1, ret);
 754                 goto err;
 755         }
 756
 757         irq = platform_get_irq_byname(pdev, "UV");
 758         ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_uv_irq,
 759                                  IRQF_TRIGGER_RISING, dcdc->name,
 760                                  dcdc);
 761         if (ret != 0) {
 762                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
 763                         irq, ret);
 764                 goto err_regulator;
 765         }
 766
 767         platform_set_drvdata(pdev, dcdc);
 768
 769         return 0;
 770
 771 err_regulator:
 772         regulator_unregister(dcdc->regulator);
 773 err:
 774         kfree(dcdc);
 775         return ret;
 776 }
 777
 778 static __devexit int wm831x_buckp_remove(struct platform_device *pdev)
 779 {
 780         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
 781         struct wm831x *wm831x = dcdc->wm831x;
 782
 783         platform_set_drvdata(pdev, NULL);
 784
 785         wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc);
 786         regulator_unregister(dcdc->regulator);
 787         kfree(dcdc);
 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);
 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 = wm831x_request_irq(wm831x, irq, 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         struct wm831x *wm831x = dcdc->wm831x;
 911
 912         platform_set_drvdata(pdev, NULL);
 913
 914         wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc);
 915         regulator_unregister(dcdc->regulator);
 916         kfree(dcdc);
 917
 918         return 0;
 919 }
 920
 921 static struct platform_driver wm831x_boostp_driver = {
 922         .probe = wm831x_boostp_probe,
 923         .remove = __devexit_p(wm831x_boostp_remove),
 924         .driver         = {
 925                 .name   = "wm831x-boostp",
 926                 .owner  = THIS_MODULE,
 927         },
 928 };
 929
 930 /*
 931  * External Power Enable
 932  *
 933  * These aren't actually DCDCs but look like them in hardware so share
 934  * code.
 935  */
 936
 937 #define WM831X_EPE_BASE 6
 938
 939 static struct regulator_ops wm831x_epe_ops = {
 940         .is_enabled = wm831x_dcdc_is_enabled,
 941         .enable = wm831x_dcdc_enable,
 942         .disable = wm831x_dcdc_disable,
 943         .get_status = wm831x_dcdc_get_status,
 944 };
 945
 946 static __devinit int wm831x_epe_probe(struct platform_device *pdev)
 947 {
 948         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 949         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
 950         int id = pdev->id % ARRAY_SIZE(pdata->epe);
 951         struct wm831x_dcdc *dcdc;
 952         int ret;
 953
 954         dev_dbg(&pdev->dev, "Probing EPE%d\n", id + 1);
 955
 956         if (pdata == NULL || pdata->epe[id] == NULL)
 957                 return -ENODEV;
 958
 959         dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
 960         if (dcdc == NULL) {
 961                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 962                 return -ENOMEM;
 963         }
 964
 965         dcdc->wm831x = wm831x;
 966
 967         /* For current parts this is correct; probably need to revisit
 968          * in future.
 969          */
 970         snprintf(dcdc->name, sizeof(dcdc->name), "EPE%d", id + 1);
 971         dcdc->desc.name = dcdc->name;
 972         dcdc->desc.id = id + WM831X_EPE_BASE; /* Offset in DCDC registers */
 973         dcdc->desc.ops = &wm831x_epe_ops;
 974         dcdc->desc.type = REGULATOR_VOLTAGE;
 975         dcdc->desc.owner = THIS_MODULE;
 976
 977         dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
 978                                              pdata->epe[id], dcdc);
 979         if (IS_ERR(dcdc->regulator)) {
 980                 ret = PTR_ERR(dcdc->regulator);
 981                 dev_err(wm831x->dev, "Failed to register EPE%d: %d\n",
 982                         id + 1, ret);
 983                 goto err;
 984         }
 985
 986         platform_set_drvdata(pdev, dcdc);
 987
 988         return 0;
 989
 990 err:
 991         kfree(dcdc);
 992         return ret;
 993 }
 994
 995 static __devexit int wm831x_epe_remove(struct platform_device *pdev)
 996 {
 997         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
 998
 999         platform_set_drvdata(pdev, NULL);
1000
1001         regulator_unregister(dcdc->regulator);
1002         kfree(dcdc);
1003
1004         return 0;
1005 }
1006
1007 static struct platform_driver wm831x_epe_driver = {
1008         .probe = wm831x_epe_probe,
1009         .remove = __devexit_p(wm831x_epe_remove),
1010         .driver         = {
1011                 .name   = "wm831x-epe",
1012                 .owner  = THIS_MODULE,
1013         },
1014 };
1015
1016 static int __init wm831x_dcdc_init(void)
1017 {
1018         int ret;
1019         ret = platform_driver_register(&wm831x_buckv_driver);
1020         if (ret != 0)
1021                 pr_err("Failed to register WM831x BUCKV driver: %d\n", ret);
1022
1023         ret = platform_driver_register(&wm831x_buckp_driver);
1024         if (ret != 0)
1025                 pr_err("Failed to register WM831x BUCKP driver: %d\n", ret);
1026
1027         ret = platform_driver_register(&wm831x_boostp_driver);
1028         if (ret != 0)
1029                 pr_err("Failed to register WM831x BOOST driver: %d\n", ret);
1030
1031         ret = platform_driver_register(&wm831x_epe_driver);
1032         if (ret != 0)
1033                 pr_err("Failed to register WM831x EPE driver: %d\n", ret);
1034
1035         return 0;
1036 }
1037 subsys_initcall(wm831x_dcdc_init);
1038
1039 static void __exit wm831x_dcdc_exit(void)
1040 {
1041         platform_driver_unregister(&wm831x_epe_driver);
1042         platform_driver_unregister(&wm831x_boostp_driver);
1043         platform_driver_unregister(&wm831x_buckp_driver);
1044         platform_driver_unregister(&wm831x_buckv_driver);
1045 }
1046 module_exit(wm831x_dcdc_exit);
1047
1048 /* Module information */
1049 MODULE_AUTHOR("Mark Brown");
1050 MODULE_DESCRIPTION("WM831x DC-DC convertor driver");
1051 MODULE_LICENSE("GPL");
1052 MODULE_ALIAS("platform:wm831x-buckv");
1053 MODULE_ALIAS("platform:wm831x-buckp");