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 <[email protected]>
   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 9
  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         char supply_name[WM831X_DCDC_MAX_NAME];
  54         struct regulator_desc desc;
  55         int base;
  56         struct wm831x *wm831x;
  57         struct regulator_dev *regulator;
  58         int dvs_gpio;
  59         int dvs_gpio_state;
  60         int on_vsel;
  61         int dvs_vsel;
  62 };
  63
  64 static unsigned int wm831x_dcdc_get_mode(struct regulator_dev *rdev)
  65
  66 {
  67         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
  68         struct wm831x *wm831x = dcdc->wm831x;
  69         u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
  70         int val;
  71
  72         val = wm831x_reg_read(wm831x, reg);
  73         if (val < 0)
  74                 return val;
  75
  76         val = (val & WM831X_DC1_ON_MODE_MASK) >> WM831X_DC1_ON_MODE_SHIFT;
  77
  78         switch (val) {
  79         case WM831X_DCDC_MODE_FAST:
  80                 return REGULATOR_MODE_FAST;
  81         case WM831X_DCDC_MODE_NORMAL:
  82                 return REGULATOR_MODE_NORMAL;
  83         case WM831X_DCDC_MODE_STANDBY:
  84                 return REGULATOR_MODE_STANDBY;
  85         case WM831X_DCDC_MODE_IDLE:
  86                 return REGULATOR_MODE_IDLE;
  87         default:
  88                 BUG();
  89                 return -EINVAL;
  90         }
  91 }
  92
  93 static int wm831x_dcdc_set_mode_int(struct wm831x *wm831x, int reg,
  94                                     unsigned int mode)
  95 {
  96         int val;
  97
  98         switch (mode) {
  99         case REGULATOR_MODE_FAST:
 100                 val = WM831X_DCDC_MODE_FAST;
 101                 break;
 102         case REGULATOR_MODE_NORMAL:
 103                 val = WM831X_DCDC_MODE_NORMAL;
 104                 break;
 105         case REGULATOR_MODE_STANDBY:
 106                 val = WM831X_DCDC_MODE_STANDBY;
 107                 break;
 108         case REGULATOR_MODE_IDLE:
 109                 val = WM831X_DCDC_MODE_IDLE;
 110                 break;
 111         default:
 112                 return -EINVAL;
 113         }
 114
 115         return wm831x_set_bits(wm831x, reg, WM831X_DC1_ON_MODE_MASK,
 116                                val << WM831X_DC1_ON_MODE_SHIFT);
 117 }
 118
 119 static int wm831x_dcdc_set_mode(struct regulator_dev *rdev, unsigned int mode)
 120 {
 121         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 122         struct wm831x *wm831x = dcdc->wm831x;
 123         u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
 124
 125         return wm831x_dcdc_set_mode_int(wm831x, reg, mode);
 126 }
 127
 128 static int wm831x_dcdc_set_suspend_mode(struct regulator_dev *rdev,
 129                                         unsigned int mode)
 130 {
 131         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 132         struct wm831x *wm831x = dcdc->wm831x;
 133         u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
 134
 135         return wm831x_dcdc_set_mode_int(wm831x, reg, mode);
 136 }
 137
 138 static int wm831x_dcdc_get_status(struct regulator_dev *rdev)
 139 {
 140         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 141         struct wm831x *wm831x = dcdc->wm831x;
 142         int ret;
 143
 144         /* First, check for errors */
 145         ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
 146         if (ret < 0)
 147                 return ret;
 148
 149         if (ret & (1 << rdev_get_id(rdev))) {
 150                 dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
 151                         rdev_get_id(rdev) + 1);
 152                 return REGULATOR_STATUS_ERROR;
 153         }
 154
 155         /* DCDC1 and DCDC2 can additionally detect high voltage/current */
 156         if (rdev_get_id(rdev) < 2) {
 157                 if (ret & (WM831X_DC1_OV_STS << rdev_get_id(rdev))) {
 158                         dev_dbg(wm831x->dev, "DCDC%d over voltage\n",
 159                                 rdev_get_id(rdev) + 1);
 160                         return REGULATOR_STATUS_ERROR;
 161                 }
 162
 163                 if (ret & (WM831X_DC1_HC_STS << rdev_get_id(rdev))) {
 164                         dev_dbg(wm831x->dev, "DCDC%d over current\n",
 165                                 rdev_get_id(rdev) + 1);
 166                         return REGULATOR_STATUS_ERROR;
 167                 }
 168         }
 169
 170         /* Is the regulator on? */
 171         ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
 172         if (ret < 0)
 173                 return ret;
 174         if (!(ret & (1 << rdev_get_id(rdev))))
 175                 return REGULATOR_STATUS_OFF;
 176
 177         /* TODO: When we handle hardware control modes so we can report the
 178          * current mode. */
 179         return REGULATOR_STATUS_ON;
 180 }
 181
 182 static irqreturn_t wm831x_dcdc_uv_irq(int irq, void *data)
 183 {
 184         struct wm831x_dcdc *dcdc = data;
 185
 186         regulator_notifier_call_chain(dcdc->regulator,
 187                                       REGULATOR_EVENT_UNDER_VOLTAGE,
 188                                       NULL);
 189
 190         return IRQ_HANDLED;
 191 }
 192
 193 static irqreturn_t wm831x_dcdc_oc_irq(int irq, void *data)
 194 {
 195         struct wm831x_dcdc *dcdc = data;
 196
 197         regulator_notifier_call_chain(dcdc->regulator,
 198                                       REGULATOR_EVENT_OVER_CURRENT,
 199                                       NULL);
 200
 201         return IRQ_HANDLED;
 202 }
 203
 204 /*
 205  * BUCKV specifics
 206  */
 207
 208 static int wm831x_buckv_list_voltage(struct regulator_dev *rdev,
 209                                       unsigned selector)
 210 {
 211         if (selector <= 0x8)
 212                 return 600000;
 213         if (selector <= WM831X_BUCKV_MAX_SELECTOR)
 214                 return 600000 + ((selector - 0x8) * 12500);
 215         return -EINVAL;
 216 }
 217
 218 static int wm831x_buckv_map_voltage(struct regulator_dev *rdev,
 219                                    int min_uV, int max_uV)
 220 {
 221         u16 vsel;
 222
 223         if (min_uV < 600000)
 224                 vsel = 0;
 225         else if (min_uV <= 1800000)
 226                 vsel = DIV_ROUND_UP(min_uV - 600000, 12500) + 8;
 227         else
 228                 return -EINVAL;
 229
 230         if (wm831x_buckv_list_voltage(rdev, vsel) > max_uV)
 231                 return -EINVAL;
 232
 233         return vsel;
 234 }
 235
 236 static int wm831x_buckv_set_dvs(struct regulator_dev *rdev, int state)
 237 {
 238         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 239
 240         if (state == dcdc->dvs_gpio_state)
 241                 return 0;
 242
 243         dcdc->dvs_gpio_state = state;
 244         gpio_set_value(dcdc->dvs_gpio, state);
 245
 246         /* Should wait for DVS state change to be asserted if we have
 247          * a GPIO for it, for now assume the device is configured
 248          * for the fastest possible transition.
 249          */
 250
 251         return 0;
 252 }
 253
 254 static int wm831x_buckv_set_voltage_sel(struct regulator_dev *rdev,
 255                                         unsigned vsel)
 256 {
 257         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 258         struct wm831x *wm831x = dcdc->wm831x;
 259         int on_reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
 260         int dvs_reg = dcdc->base + WM831X_DCDC_DVS_CONTROL;
 261         int ret;
 262
 263         /* If this value is already set then do a GPIO update if we can */
 264         if (dcdc->dvs_gpio && dcdc->on_vsel == vsel)
 265                 return wm831x_buckv_set_dvs(rdev, 0);
 266
 267         if (dcdc->dvs_gpio && dcdc->dvs_vsel == vsel)
 268                 return wm831x_buckv_set_dvs(rdev, 1);
 269
 270         /* Always set the ON status to the minimum voltage */
 271         ret = wm831x_set_bits(wm831x, on_reg, WM831X_DC1_ON_VSEL_MASK, vsel);
 272         if (ret < 0)
 273                 return ret;
 274         dcdc->on_vsel = vsel;
 275
 276         if (!dcdc->dvs_gpio)
 277                 return ret;
 278
 279         /* Kick the voltage transition now */
 280         ret = wm831x_buckv_set_dvs(rdev, 0);
 281         if (ret < 0)
 282                 return ret;
 283
 284         /*
 285          * If this VSEL is higher than the last one we've seen then
 286          * remember it as the DVS VSEL.  This is optimised for CPUfreq
 287          * usage where we want to get to the highest voltage very
 288          * quickly.
 289          */
 290         if (vsel > dcdc->dvs_vsel) {
 291                 ret = wm831x_set_bits(wm831x, dvs_reg,
 292                                       WM831X_DC1_DVS_VSEL_MASK,
 293                                       vsel);
 294                 if (ret == 0)
 295                         dcdc->dvs_vsel = vsel;
 296                 else
 297                         dev_warn(wm831x->dev,
 298                                  "Failed to set DCDC DVS VSEL: %d\n", ret);
 299         }
 300
 301         return 0;
 302 }
 303
 304 static int wm831x_buckv_set_suspend_voltage(struct regulator_dev *rdev,
 305                                             int uV)
 306 {
 307         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 308         struct wm831x *wm831x = dcdc->wm831x;
 309         u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
 310         int vsel;
 311
 312         vsel = wm831x_buckv_map_voltage(rdev, uV, uV);
 313         if (vsel < 0)
 314                 return vsel;
 315
 316         return wm831x_set_bits(wm831x, reg, WM831X_DC1_SLP_VSEL_MASK, vsel);
 317 }
 318
 319 static int wm831x_buckv_get_voltage_sel(struct regulator_dev *rdev)
 320 {
 321         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 322
 323         if (dcdc->dvs_gpio && dcdc->dvs_gpio_state)
 324                 return dcdc->dvs_vsel;
 325         else
 326                 return dcdc->on_vsel;
 327 }
 328
 329 /* Current limit options */
 330 static u16 wm831x_dcdc_ilim[] = {
 331         125, 250, 375, 500, 625, 750, 875, 1000
 332 };
 333
 334 static int wm831x_buckv_set_current_limit(struct regulator_dev *rdev,
 335                                            int min_uA, int max_uA)
 336 {
 337         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 338         struct wm831x *wm831x = dcdc->wm831x;
 339         u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2;
 340         int i;
 341
 342         for (i = ARRAY_SIZE(wm831x_dcdc_ilim) - 1; i >= 0; i--) {
 343                 if ((min_uA <= wm831x_dcdc_ilim[i]) &&
 344                     (wm831x_dcdc_ilim[i] <= max_uA))
 345                         return wm831x_set_bits(wm831x, reg,
 346                                                WM831X_DC1_HC_THR_MASK,
 347                                                 i << WM831X_DC1_HC_THR_SHIFT);
 348         }
 349
 350         return -EINVAL;
 351 }
 352
 353 static int wm831x_buckv_get_current_limit(struct regulator_dev *rdev)
 354 {
 355         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 356         struct wm831x *wm831x = dcdc->wm831x;
 357         u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2;
 358         int val;
 359
 360         val = wm831x_reg_read(wm831x, reg);
 361         if (val < 0)
 362                 return val;
 363
 364         val = (val & WM831X_DC1_HC_THR_MASK) >> WM831X_DC1_HC_THR_SHIFT;
 365         return wm831x_dcdc_ilim[val];
 366 }
 367
 368 static struct regulator_ops wm831x_buckv_ops = {
 369         .set_voltage_sel = wm831x_buckv_set_voltage_sel,
 370         .get_voltage_sel = wm831x_buckv_get_voltage_sel,
 371         .list_voltage = wm831x_buckv_list_voltage,
 372         .map_voltage = wm831x_buckv_map_voltage,
 373         .set_suspend_voltage = wm831x_buckv_set_suspend_voltage,
 374         .set_current_limit = wm831x_buckv_set_current_limit,
 375         .get_current_limit = wm831x_buckv_get_current_limit,
 376
 377         .is_enabled = regulator_is_enabled_regmap,
 378         .enable = regulator_enable_regmap,
 379         .disable = regulator_disable_regmap,
 380         .get_status = wm831x_dcdc_get_status,
 381         .get_mode = wm831x_dcdc_get_mode,
 382         .set_mode = wm831x_dcdc_set_mode,
 383         .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
 384 };
 385
 386 /*
 387  * Set up DVS control.  We just log errors since we can still run
 388  * (with reduced performance) if we fail.
 389  */
 390 static void wm831x_buckv_dvs_init(struct platform_device *pdev,
 391                                   struct wm831x_dcdc *dcdc,
 392                                   struct wm831x_buckv_pdata *pdata)
 393 {
 394         struct wm831x *wm831x = dcdc->wm831x;
 395         int ret;
 396         u16 ctrl;
 397
 398         if (!pdata || !pdata->dvs_gpio)
 399                 return;
 400
 401         /* gpiolib won't let us read the GPIO status so pick the higher
 402          * of the two existing voltages so we take it as platform data.
 403          */
 404         dcdc->dvs_gpio_state = pdata->dvs_init_state;
 405
 406         ret = devm_gpio_request_one(&pdev->dev, pdata->dvs_gpio,
 407                                     dcdc->dvs_gpio_state ? GPIOF_INIT_HIGH : 0,
 408                                     "DCDC DVS");
 409         if (ret < 0) {
 410                 dev_err(wm831x->dev, "Failed to get %s DVS GPIO: %d\n",
 411                         dcdc->name, ret);
 412                 return;
 413         }
 414
 415         dcdc->dvs_gpio = pdata->dvs_gpio;
 416
 417         switch (pdata->dvs_control_src) {
 418         case 1:
 419                 ctrl = 2 << WM831X_DC1_DVS_SRC_SHIFT;
 420                 break;
 421         case 2:
 422                 ctrl = 3 << WM831X_DC1_DVS_SRC_SHIFT;
 423                 break;
 424         default:
 425                 dev_err(wm831x->dev, "Invalid DVS control source %d for %s\n",
 426                         pdata->dvs_control_src, dcdc->name);
 427                 return;
 428         }
 429
 430         /* If DVS_VSEL is set to the minimum value then raise it to ON_VSEL
 431          * to make bootstrapping a bit smoother.
 432          */
 433         if (!dcdc->dvs_vsel) {
 434                 ret = wm831x_set_bits(wm831x,
 435                                       dcdc->base + WM831X_DCDC_DVS_CONTROL,
 436                                       WM831X_DC1_DVS_VSEL_MASK, dcdc->on_vsel);
 437                 if (ret == 0)
 438                         dcdc->dvs_vsel = dcdc->on_vsel;
 439                 else
 440                         dev_warn(wm831x->dev, "Failed to set DVS_VSEL: %d\n",
 441                                  ret);
 442         }
 443
 444         ret = wm831x_set_bits(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL,
 445                               WM831X_DC1_DVS_SRC_MASK, ctrl);
 446         if (ret < 0) {
 447                 dev_err(wm831x->dev, "Failed to set %s DVS source: %d\n",
 448                         dcdc->name, ret);
 449         }
 450 }
 451
 452 static int wm831x_buckv_probe(struct platform_device *pdev)
 453 {
 454         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 455         struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
 456         struct regulator_config config = { };
 457         int id;
 458         struct wm831x_dcdc *dcdc;
 459         struct resource *res;
 460         int ret, irq;
 461
 462         if (pdata && pdata->wm831x_num)
 463                 id = (pdata->wm831x_num * 10) + 1;
 464         else
 465                 id = 0;
 466         id = pdev->id - id;
 467
 468         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
 469
 470         dcdc = devm_kzalloc(&pdev->dev,  sizeof(struct wm831x_dcdc),
 471                             GFP_KERNEL);
 472         if (!dcdc)
 473                 return -ENOMEM;
 474
 475         dcdc->wm831x = wm831x;
 476
 477         res = platform_get_resource(pdev, IORESOURCE_REG, 0);
 478         if (res == NULL) {
 479                 dev_err(&pdev->dev, "No REG resource\n");
 480                 ret = -EINVAL;
 481                 goto err;
 482         }
 483         dcdc->base = res->start;
 484
 485         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
 486         dcdc->desc.name = dcdc->name;
 487
 488         snprintf(dcdc->supply_name, sizeof(dcdc->supply_name),
 489                  "DC%dVDD", id + 1);
 490         dcdc->desc.supply_name = dcdc->supply_name;
 491
 492         dcdc->desc.id = id;
 493         dcdc->desc.type = REGULATOR_VOLTAGE;
 494         dcdc->desc.n_voltages = WM831X_BUCKV_MAX_SELECTOR + 1;
 495         dcdc->desc.ops = &wm831x_buckv_ops;
 496         dcdc->desc.owner = THIS_MODULE;
 497         dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
 498         dcdc->desc.enable_mask = 1 << id;
 499
 500         ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG);
 501         if (ret < 0) {
 502                 dev_err(wm831x->dev, "Failed to read ON VSEL: %d\n", ret);
 503                 goto err;
 504         }
 505         dcdc->on_vsel = ret & WM831X_DC1_ON_VSEL_MASK;
 506
 507         ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL);
 508         if (ret < 0) {
 509                 dev_err(wm831x->dev, "Failed to read DVS VSEL: %d\n", ret);
 510                 goto err;
 511         }
 512         dcdc->dvs_vsel = ret & WM831X_DC1_DVS_VSEL_MASK;
 513
 514         if (pdata && pdata->dcdc[id])
 515                 wm831x_buckv_dvs_init(pdev, dcdc,
 516                                       pdata->dcdc[id]->driver_data);
 517
 518         config.dev = pdev->dev.parent;
 519         if (pdata)
 520                 config.init_data = pdata->dcdc[id];
 521         config.driver_data = dcdc;
 522         config.regmap = wm831x->regmap;
 523
 524         dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc,
 525                                                   &config);
 526         if (IS_ERR(dcdc->regulator)) {
 527                 ret = PTR_ERR(dcdc->regulator);
 528                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
 529                         id + 1, ret);
 530                 goto err;
 531         }
 532
 533         irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
 534         ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
 535                                         wm831x_dcdc_uv_irq,
 536                                         IRQF_TRIGGER_RISING, dcdc->name, dcdc);
 537         if (ret != 0) {
 538                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
 539                         irq, ret);
 540                 goto err;
 541         }
 542
 543         irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "HC"));
 544         ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
 545                                         wm831x_dcdc_oc_irq,
 546                                         IRQF_TRIGGER_RISING, dcdc->name, dcdc);
 547         if (ret != 0) {
 548                 dev_err(&pdev->dev, "Failed to request HC IRQ %d: %d\n",
 549                         irq, ret);
 550                 goto err;
 551         }
 552
 553         platform_set_drvdata(pdev, dcdc);
 554
 555         return 0;
 556
 557 err:
 558         return ret;
 559 }
 560
 561 static struct platform_driver wm831x_buckv_driver = {
 562         .probe = wm831x_buckv_probe,
 563         .driver         = {
 564                 .name   = "wm831x-buckv",
 565         },
 566 };
 567
 568 /*
 569  * BUCKP specifics
 570  */
 571
 572 static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev, int uV)
 573 {
 574         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 575         struct wm831x *wm831x = dcdc->wm831x;
 576         u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
 577         int sel;
 578
 579         sel = regulator_map_voltage_linear(rdev, uV, uV);
 580         if (sel < 0)
 581                 return sel;
 582
 583         return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, sel);
 584 }
 585
 586 static struct regulator_ops wm831x_buckp_ops = {
 587         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 588         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 589         .list_voltage = regulator_list_voltage_linear,
 590         .map_voltage = regulator_map_voltage_linear,
 591         .set_suspend_voltage = wm831x_buckp_set_suspend_voltage,
 592
 593         .is_enabled = regulator_is_enabled_regmap,
 594         .enable = regulator_enable_regmap,
 595         .disable = regulator_disable_regmap,
 596         .get_status = wm831x_dcdc_get_status,
 597         .get_mode = wm831x_dcdc_get_mode,
 598         .set_mode = wm831x_dcdc_set_mode,
 599         .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
 600 };
 601
 602 static int wm831x_buckp_probe(struct platform_device *pdev)
 603 {
 604         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 605         struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
 606         struct regulator_config config = { };
 607         int id;
 608         struct wm831x_dcdc *dcdc;
 609         struct resource *res;
 610         int ret, irq;
 611
 612         if (pdata && pdata->wm831x_num)
 613                 id = (pdata->wm831x_num * 10) + 1;
 614         else
 615                 id = 0;
 616         id = pdev->id - id;
 617
 618         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
 619
 620         dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc),
 621                             GFP_KERNEL);
 622         if (!dcdc)
 623                 return -ENOMEM;
 624
 625         dcdc->wm831x = wm831x;
 626
 627         res = platform_get_resource(pdev, IORESOURCE_REG, 0);
 628         if (res == NULL) {
 629                 dev_err(&pdev->dev, "No REG resource\n");
 630                 ret = -EINVAL;
 631                 goto err;
 632         }
 633         dcdc->base = res->start;
 634
 635         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
 636         dcdc->desc.name = dcdc->name;
 637
 638         snprintf(dcdc->supply_name, sizeof(dcdc->supply_name),
 639                  "DC%dVDD", id + 1);
 640         dcdc->desc.supply_name = dcdc->supply_name;
 641
 642         dcdc->desc.id = id;
 643         dcdc->desc.type = REGULATOR_VOLTAGE;
 644         dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1;
 645         dcdc->desc.ops = &wm831x_buckp_ops;
 646         dcdc->desc.owner = THIS_MODULE;
 647         dcdc->desc.vsel_reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
 648         dcdc->desc.vsel_mask = WM831X_DC3_ON_VSEL_MASK;
 649         dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
 650         dcdc->desc.enable_mask = 1 << id;
 651         dcdc->desc.min_uV = 850000;
 652         dcdc->desc.uV_step = 25000;
 653
 654         config.dev = pdev->dev.parent;
 655         if (pdata)
 656                 config.init_data = pdata->dcdc[id];
 657         config.driver_data = dcdc;
 658         config.regmap = wm831x->regmap;
 659
 660         dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc,
 661                                                   &config);
 662         if (IS_ERR(dcdc->regulator)) {
 663                 ret = PTR_ERR(dcdc->regulator);
 664                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
 665                         id + 1, ret);
 666                 goto err;
 667         }
 668
 669         irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
 670         ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
 671                                         wm831x_dcdc_uv_irq,
 672                                         IRQF_TRIGGER_RISING, dcdc->name, dcdc);
 673         if (ret != 0) {
 674                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
 675                         irq, ret);
 676                 goto err;
 677         }
 678
 679         platform_set_drvdata(pdev, dcdc);
 680
 681         return 0;
 682
 683 err:
 684         return ret;
 685 }
 686
 687 static struct platform_driver wm831x_buckp_driver = {
 688         .probe = wm831x_buckp_probe,
 689         .driver         = {
 690                 .name   = "wm831x-buckp",
 691         },
 692 };
 693
 694 /*
 695  * DCDC boost convertors
 696  */
 697
 698 static int wm831x_boostp_get_status(struct regulator_dev *rdev)
 699 {
 700         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 701         struct wm831x *wm831x = dcdc->wm831x;
 702         int ret;
 703
 704         /* First, check for errors */
 705         ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
 706         if (ret < 0)
 707                 return ret;
 708
 709         if (ret & (1 << rdev_get_id(rdev))) {
 710                 dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
 711                         rdev_get_id(rdev) + 1);
 712                 return REGULATOR_STATUS_ERROR;
 713         }
 714
 715         /* Is the regulator on? */
 716         ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
 717         if (ret < 0)
 718                 return ret;
 719         if (ret & (1 << rdev_get_id(rdev)))
 720                 return REGULATOR_STATUS_ON;
 721         else
 722                 return REGULATOR_STATUS_OFF;
 723 }
 724
 725 static struct regulator_ops wm831x_boostp_ops = {
 726         .get_status = wm831x_boostp_get_status,
 727
 728         .is_enabled = regulator_is_enabled_regmap,
 729         .enable = regulator_enable_regmap,
 730         .disable = regulator_disable_regmap,
 731 };
 732
 733 static int wm831x_boostp_probe(struct platform_device *pdev)
 734 {
 735         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 736         struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
 737         struct regulator_config config = { };
 738         int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
 739         struct wm831x_dcdc *dcdc;
 740         struct resource *res;
 741         int ret, irq;
 742
 743         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
 744
 745         if (pdata == NULL || pdata->dcdc[id] == NULL)
 746                 return -ENODEV;
 747
 748         dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), GFP_KERNEL);
 749         if (!dcdc)
 750                 return -ENOMEM;
 751
 752         dcdc->wm831x = wm831x;
 753
 754         res = platform_get_resource(pdev, IORESOURCE_REG, 0);
 755         if (res == NULL) {
 756                 dev_err(&pdev->dev, "No REG resource\n");
 757                 return -EINVAL;
 758         }
 759         dcdc->base = res->start;
 760
 761         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
 762         dcdc->desc.name = dcdc->name;
 763         dcdc->desc.id = id;
 764         dcdc->desc.type = REGULATOR_VOLTAGE;
 765         dcdc->desc.ops = &wm831x_boostp_ops;
 766         dcdc->desc.owner = THIS_MODULE;
 767         dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
 768         dcdc->desc.enable_mask = 1 << id;
 769
 770         config.dev = pdev->dev.parent;
 771         if (pdata)
 772                 config.init_data = pdata->dcdc[id];
 773         config.driver_data = dcdc;
 774         config.regmap = wm831x->regmap;
 775
 776         dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc,
 777                                                   &config);
 778         if (IS_ERR(dcdc->regulator)) {
 779                 ret = PTR_ERR(dcdc->regulator);
 780                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
 781                         id + 1, ret);
 782                 return ret;
 783         }
 784
 785         irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
 786         ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
 787                                         wm831x_dcdc_uv_irq,
 788                                         IRQF_TRIGGER_RISING, dcdc->name,
 789                                         dcdc);
 790         if (ret != 0) {
 791                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
 792                         irq, ret);
 793                 return ret;
 794         }
 795
 796         platform_set_drvdata(pdev, dcdc);
 797
 798         return 0;
 799 }
 800
 801 static struct platform_driver wm831x_boostp_driver = {
 802         .probe = wm831x_boostp_probe,
 803         .driver         = {
 804                 .name   = "wm831x-boostp",
 805         },
 806 };
 807
 808 /*
 809  * External Power Enable
 810  *
 811  * These aren't actually DCDCs but look like them in hardware so share
 812  * code.
 813  */
 814
 815 #define WM831X_EPE_BASE 6
 816
 817 static struct regulator_ops wm831x_epe_ops = {
 818         .is_enabled = regulator_is_enabled_regmap,
 819         .enable = regulator_enable_regmap,
 820         .disable = regulator_disable_regmap,
 821         .get_status = wm831x_dcdc_get_status,
 822 };
 823
 824 static int wm831x_epe_probe(struct platform_device *pdev)
 825 {
 826         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 827         struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
 828         struct regulator_config config = { };
 829         int id = pdev->id % ARRAY_SIZE(pdata->epe);
 830         struct wm831x_dcdc *dcdc;
 831         int ret;
 832
 833         dev_dbg(&pdev->dev, "Probing EPE%d\n", id + 1);
 834
 835         dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), GFP_KERNEL);
 836         if (!dcdc)
 837                 return -ENOMEM;
 838
 839         dcdc->wm831x = wm831x;
 840
 841         /* For current parts this is correct; probably need to revisit
 842          * in future.
 843          */
 844         snprintf(dcdc->name, sizeof(dcdc->name), "EPE%d", id + 1);
 845         dcdc->desc.name = dcdc->name;
 846         dcdc->desc.id = id + WM831X_EPE_BASE; /* Offset in DCDC registers */
 847         dcdc->desc.ops = &wm831x_epe_ops;
 848         dcdc->desc.type = REGULATOR_VOLTAGE;
 849         dcdc->desc.owner = THIS_MODULE;
 850         dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
 851         dcdc->desc.enable_mask = 1 << dcdc->desc.id;
 852
 853         config.dev = pdev->dev.parent;
 854         if (pdata)
 855                 config.init_data = pdata->epe[id];
 856         config.driver_data = dcdc;
 857         config.regmap = wm831x->regmap;
 858
 859         dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc,
 860                                                   &config);
 861         if (IS_ERR(dcdc->regulator)) {
 862                 ret = PTR_ERR(dcdc->regulator);
 863                 dev_err(wm831x->dev, "Failed to register EPE%d: %d\n",
 864                         id + 1, ret);
 865                 goto err;
 866         }
 867
 868         platform_set_drvdata(pdev, dcdc);
 869
 870         return 0;
 871
 872 err:
 873         return ret;
 874 }
 875
 876 static struct platform_driver wm831x_epe_driver = {
 877         .probe = wm831x_epe_probe,
 878         .driver         = {
 879                 .name   = "wm831x-epe",
 880         },
 881 };
 882
 883 static int __init wm831x_dcdc_init(void)
 884 {
 885         int ret;
 886         ret = platform_driver_register(&wm831x_buckv_driver);
 887         if (ret != 0)
 888                 pr_err("Failed to register WM831x BUCKV driver: %d\n", ret);
 889
 890         ret = platform_driver_register(&wm831x_buckp_driver);
 891         if (ret != 0)
 892                 pr_err("Failed to register WM831x BUCKP driver: %d\n", ret);
 893
 894         ret = platform_driver_register(&wm831x_boostp_driver);
 895         if (ret != 0)
 896                 pr_err("Failed to register WM831x BOOST driver: %d\n", ret);
 897
 898         ret = platform_driver_register(&wm831x_epe_driver);
 899         if (ret != 0)
 900                 pr_err("Failed to register WM831x EPE driver: %d\n", ret);
 901
 902         return 0;
 903 }
 904 subsys_initcall(wm831x_dcdc_init);
 905
 906 static void __exit wm831x_dcdc_exit(void)
 907 {
 908         platform_driver_unregister(&wm831x_epe_driver);
 909         platform_driver_unregister(&wm831x_boostp_driver);
 910         platform_driver_unregister(&wm831x_buckp_driver);
 911         platform_driver_unregister(&wm831x_buckv_driver);
 912 }
 913 module_exit(wm831x_dcdc_exit);
 914
 915 /* Module information */
 916 MODULE_AUTHOR("Mark Brown");
 917 MODULE_DESCRIPTION("WM831x DC-DC convertor driver");
 918 MODULE_LICENSE("GPL");
 919 MODULE_ALIAS("platform:wm831x-buckv");
 920 MODULE_ALIAS("platform:wm831x-buckp");
 921 MODULE_ALIAS("platform:wm831x-boostp");
 922 MODULE_ALIAS("platform:wm831x-epe");