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 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 = ((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                                       dcdc->dvs_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 = 0; i < ARRAY_SIZE(wm831x_dcdc_ilim); i++) {
 343                 if ((min_uA <= wm831x_dcdc_ilim[i]) &&
 344                     (wm831x_dcdc_ilim[i] <= max_uA))
 345                         break;
 346         }
 347         if (i == ARRAY_SIZE(wm831x_dcdc_ilim))
 348                 return -EINVAL;
 349
 350         return wm831x_set_bits(wm831x, reg, WM831X_DC1_HC_THR_MASK,
 351                                i << WM831X_DC1_HC_THR_SHIFT);
 352 }
 353
 354 static int wm831x_buckv_get_current_limit(struct regulator_dev *rdev)
 355 {
 356         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 357         struct wm831x *wm831x = dcdc->wm831x;
 358         u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2;
 359         int val;
 360
 361         val = wm831x_reg_read(wm831x, reg);
 362         if (val < 0)
 363                 return val;
 364
 365         val = (val & WM831X_DC1_HC_THR_MASK) >> WM831X_DC1_HC_THR_SHIFT;
 366         return wm831x_dcdc_ilim[val];
 367 }
 368
 369 static struct regulator_ops wm831x_buckv_ops = {
 370         .set_voltage_sel = wm831x_buckv_set_voltage_sel,
 371         .get_voltage_sel = wm831x_buckv_get_voltage_sel,
 372         .list_voltage = wm831x_buckv_list_voltage,
 373         .map_voltage = wm831x_buckv_map_voltage,
 374         .set_suspend_voltage = wm831x_buckv_set_suspend_voltage,
 375         .set_current_limit = wm831x_buckv_set_current_limit,
 376         .get_current_limit = wm831x_buckv_get_current_limit,
 377
 378         .is_enabled = regulator_is_enabled_regmap,
 379         .enable = regulator_enable_regmap,
 380         .disable = regulator_disable_regmap,
 381         .get_status = wm831x_dcdc_get_status,
 382         .get_mode = wm831x_dcdc_get_mode,
 383         .set_mode = wm831x_dcdc_set_mode,
 384         .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
 385 };
 386
 387 /*
 388  * Set up DVS control.  We just log errors since we can still run
 389  * (with reduced performance) if we fail.
 390  */
 391 static __devinit void wm831x_buckv_dvs_init(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 = gpio_request_one(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 __devinit int wm831x_buckv_probe(struct platform_device *pdev)
 453 {
 454         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 455         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
 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 == NULL) {
 473                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 474                 return -ENOMEM;
 475         }
 476
 477         dcdc->wm831x = wm831x;
 478
 479         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 480         if (res == NULL) {
 481                 dev_err(&pdev->dev, "No I/O resource\n");
 482                 ret = -EINVAL;
 483                 goto err;
 484         }
 485         dcdc->base = res->start;
 486
 487         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
 488         dcdc->desc.name = dcdc->name;
 489
 490         snprintf(dcdc->supply_name, sizeof(dcdc->supply_name),
 491                  "DC%dVDD", id + 1);
 492         dcdc->desc.supply_name = dcdc->supply_name;
 493
 494         dcdc->desc.id = id;
 495         dcdc->desc.type = REGULATOR_VOLTAGE;
 496         dcdc->desc.n_voltages = WM831X_BUCKV_MAX_SELECTOR + 1;
 497         dcdc->desc.ops = &wm831x_buckv_ops;
 498         dcdc->desc.owner = THIS_MODULE;
 499         dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
 500         dcdc->desc.enable_mask = 1 << id;
 501
 502         ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG);
 503         if (ret < 0) {
 504                 dev_err(wm831x->dev, "Failed to read ON VSEL: %d\n", ret);
 505                 goto err;
 506         }
 507         dcdc->on_vsel = ret & WM831X_DC1_ON_VSEL_MASK;
 508
 509         ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL);
 510         if (ret < 0) {
 511                 dev_err(wm831x->dev, "Failed to read DVS VSEL: %d\n", ret);
 512                 goto err;
 513         }
 514         dcdc->dvs_vsel = ret & WM831X_DC1_DVS_VSEL_MASK;
 515
 516         if (pdata && pdata->dcdc[id])
 517                 wm831x_buckv_dvs_init(dcdc, pdata->dcdc[id]->driver_data);
 518
 519         config.dev = pdev->dev.parent;
 520         if (pdata)
 521                 config.init_data = pdata->dcdc[id];
 522         config.driver_data = dcdc;
 523         config.regmap = wm831x->regmap;
 524
 525         dcdc->regulator = regulator_register(&dcdc->desc, &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 = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
 535                                    IRQF_TRIGGER_RISING, dcdc->name, dcdc);
 536         if (ret != 0) {
 537                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
 538                         irq, ret);
 539                 goto err_regulator;
 540         }
 541
 542         irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "HC"));
 543         ret = request_threaded_irq(irq, NULL, wm831x_dcdc_oc_irq,
 544                                    IRQF_TRIGGER_RISING, dcdc->name, dcdc);
 545         if (ret != 0) {
 546                 dev_err(&pdev->dev, "Failed to request HC IRQ %d: %d\n",
 547                         irq, ret);
 548                 goto err_uv;
 549         }
 550
 551         platform_set_drvdata(pdev, dcdc);
 552
 553         return 0;
 554
 555 err_uv:
 556         free_irq(wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV")),
 557                  dcdc);
 558 err_regulator:
 559         regulator_unregister(dcdc->regulator);
 560 err:
 561         if (dcdc->dvs_gpio)
 562                 gpio_free(dcdc->dvs_gpio);
 563         return ret;
 564 }
 565
 566 static __devexit int wm831x_buckv_remove(struct platform_device *pdev)
 567 {
 568         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
 569         struct wm831x *wm831x = dcdc->wm831x;
 570
 571         platform_set_drvdata(pdev, NULL);
 572
 573         free_irq(wm831x_irq(wm831x, platform_get_irq_byname(pdev, "HC")),
 574                             dcdc);
 575         free_irq(wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV")),
 576                             dcdc);
 577         regulator_unregister(dcdc->regulator);
 578         if (dcdc->dvs_gpio)
 579                 gpio_free(dcdc->dvs_gpio);
 580
 581         return 0;
 582 }
 583
 584 static struct platform_driver wm831x_buckv_driver = {
 585         .probe = wm831x_buckv_probe,
 586         .remove = __devexit_p(wm831x_buckv_remove),
 587         .driver         = {
 588                 .name   = "wm831x-buckv",
 589                 .owner  = THIS_MODULE,
 590         },
 591 };
 592
 593 /*
 594  * BUCKP specifics
 595  */
 596
 597 static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev, int uV)
 598 {
 599         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 600         struct wm831x *wm831x = dcdc->wm831x;
 601         u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
 602         int sel;
 603
 604         sel = regulator_map_voltage_linear(rdev, uV, uV);
 605         if (sel < 0)
 606                 return sel;
 607
 608         return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, sel);
 609 }
 610
 611 static struct regulator_ops wm831x_buckp_ops = {
 612         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 613         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 614         .list_voltage = regulator_list_voltage_linear,
 615         .map_voltage = regulator_map_voltage_linear,
 616         .set_suspend_voltage = wm831x_buckp_set_suspend_voltage,
 617
 618         .is_enabled = regulator_is_enabled_regmap,
 619         .enable = regulator_enable_regmap,
 620         .disable = regulator_disable_regmap,
 621         .get_status = wm831x_dcdc_get_status,
 622         .get_mode = wm831x_dcdc_get_mode,
 623         .set_mode = wm831x_dcdc_set_mode,
 624         .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
 625 };
 626
 627 static __devinit int wm831x_buckp_probe(struct platform_device *pdev)
 628 {
 629         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 630         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
 631         struct regulator_config config = { };
 632         int id;
 633         struct wm831x_dcdc *dcdc;
 634         struct resource *res;
 635         int ret, irq;
 636
 637         if (pdata && pdata->wm831x_num)
 638                 id = (pdata->wm831x_num * 10) + 1;
 639         else
 640                 id = 0;
 641         id = pdev->id - id;
 642
 643         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
 644
 645         dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc),
 646                             GFP_KERNEL);
 647         if (dcdc == NULL) {
 648                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 649                 return -ENOMEM;
 650         }
 651
 652         dcdc->wm831x = wm831x;
 653
 654         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 655         if (res == NULL) {
 656                 dev_err(&pdev->dev, "No I/O resource\n");
 657                 ret = -EINVAL;
 658                 goto err;
 659         }
 660         dcdc->base = res->start;
 661
 662         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
 663         dcdc->desc.name = dcdc->name;
 664
 665         snprintf(dcdc->supply_name, sizeof(dcdc->supply_name),
 666                  "DC%dVDD", id + 1);
 667         dcdc->desc.supply_name = dcdc->supply_name;
 668
 669         dcdc->desc.id = id;
 670         dcdc->desc.type = REGULATOR_VOLTAGE;
 671         dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1;
 672         dcdc->desc.ops = &wm831x_buckp_ops;
 673         dcdc->desc.owner = THIS_MODULE;
 674         dcdc->desc.vsel_reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
 675         dcdc->desc.vsel_mask = WM831X_DC3_ON_VSEL_MASK;
 676         dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
 677         dcdc->desc.enable_mask = 1 << id;
 678         dcdc->desc.min_uV = 850000;
 679         dcdc->desc.uV_step = 25000;
 680
 681         config.dev = pdev->dev.parent;
 682         if (pdata)
 683                 config.init_data = pdata->dcdc[id];
 684         config.driver_data = dcdc;
 685         config.regmap = wm831x->regmap;
 686
 687         dcdc->regulator = regulator_register(&dcdc->desc, &config);
 688         if (IS_ERR(dcdc->regulator)) {
 689                 ret = PTR_ERR(dcdc->regulator);
 690                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
 691                         id + 1, ret);
 692                 goto err;
 693         }
 694
 695         irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
 696         ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
 697                                    IRQF_TRIGGER_RISING, dcdc->name, dcdc);
 698         if (ret != 0) {
 699                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
 700                         irq, ret);
 701                 goto err_regulator;
 702         }
 703
 704         platform_set_drvdata(pdev, dcdc);
 705
 706         return 0;
 707
 708 err_regulator:
 709         regulator_unregister(dcdc->regulator);
 710 err:
 711         return ret;
 712 }
 713
 714 static __devexit int wm831x_buckp_remove(struct platform_device *pdev)
 715 {
 716         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
 717
 718         platform_set_drvdata(pdev, NULL);
 719
 720         free_irq(wm831x_irq(dcdc->wm831x, platform_get_irq_byname(pdev, "UV")),
 721                             dcdc);
 722         regulator_unregister(dcdc->regulator);
 723
 724         return 0;
 725 }
 726
 727 static struct platform_driver wm831x_buckp_driver = {
 728         .probe = wm831x_buckp_probe,
 729         .remove = __devexit_p(wm831x_buckp_remove),
 730         .driver         = {
 731                 .name   = "wm831x-buckp",
 732                 .owner  = THIS_MODULE,
 733         },
 734 };
 735
 736 /*
 737  * DCDC boost convertors
 738  */
 739
 740 static int wm831x_boostp_get_status(struct regulator_dev *rdev)
 741 {
 742         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 743         struct wm831x *wm831x = dcdc->wm831x;
 744         int ret;
 745
 746         /* First, check for errors */
 747         ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
 748         if (ret < 0)
 749                 return ret;
 750
 751         if (ret & (1 << rdev_get_id(rdev))) {
 752                 dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
 753                         rdev_get_id(rdev) + 1);
 754                 return REGULATOR_STATUS_ERROR;
 755         }
 756
 757         /* Is the regulator on? */
 758         ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
 759         if (ret < 0)
 760                 return ret;
 761         if (ret & (1 << rdev_get_id(rdev)))
 762                 return REGULATOR_STATUS_ON;
 763         else
 764                 return REGULATOR_STATUS_OFF;
 765 }
 766
 767 static struct regulator_ops wm831x_boostp_ops = {
 768         .get_status = wm831x_boostp_get_status,
 769
 770         .is_enabled = regulator_is_enabled_regmap,
 771         .enable = regulator_enable_regmap,
 772         .disable = regulator_disable_regmap,
 773 };
 774
 775 static __devinit int wm831x_boostp_probe(struct platform_device *pdev)
 776 {
 777         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 778         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
 779         struct regulator_config config = { };
 780         int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
 781         struct wm831x_dcdc *dcdc;
 782         struct resource *res;
 783         int ret, irq;
 784
 785         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
 786
 787         if (pdata == NULL || pdata->dcdc[id] == NULL)
 788                 return -ENODEV;
 789
 790         dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), GFP_KERNEL);
 791         if (dcdc == NULL) {
 792                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 793                 return -ENOMEM;
 794         }
 795
 796         dcdc->wm831x = wm831x;
 797
 798         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 799         if (res == NULL) {
 800                 dev_err(&pdev->dev, "No I/O resource\n");
 801                 ret = -EINVAL;
 802                 goto err;
 803         }
 804         dcdc->base = res->start;
 805
 806         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
 807         dcdc->desc.name = dcdc->name;
 808         dcdc->desc.id = id;
 809         dcdc->desc.type = REGULATOR_VOLTAGE;
 810         dcdc->desc.ops = &wm831x_boostp_ops;
 811         dcdc->desc.owner = THIS_MODULE;
 812         dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
 813         dcdc->desc.enable_mask = 1 << id;
 814
 815         config.dev = pdev->dev.parent;
 816         if (pdata)
 817                 config.init_data = pdata->dcdc[id];
 818         config.driver_data = dcdc;
 819         config.regmap = wm831x->regmap;
 820
 821         dcdc->regulator = regulator_register(&dcdc->desc, &config);
 822         if (IS_ERR(dcdc->regulator)) {
 823                 ret = PTR_ERR(dcdc->regulator);
 824                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
 825                         id + 1, ret);
 826                 goto err;
 827         }
 828
 829         irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
 830         ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
 831                                    IRQF_TRIGGER_RISING, dcdc->name,
 832                                    dcdc);
 833         if (ret != 0) {
 834                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
 835                         irq, ret);
 836                 goto err_regulator;
 837         }
 838
 839         platform_set_drvdata(pdev, dcdc);
 840
 841         return 0;
 842
 843 err_regulator:
 844         regulator_unregister(dcdc->regulator);
 845 err:
 846         return ret;
 847 }
 848
 849 static __devexit int wm831x_boostp_remove(struct platform_device *pdev)
 850 {
 851         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
 852
 853         platform_set_drvdata(pdev, NULL);
 854
 855         free_irq(wm831x_irq(dcdc->wm831x, platform_get_irq_byname(pdev, "UV")),
 856                  dcdc);
 857         regulator_unregister(dcdc->regulator);
 858
 859         return 0;
 860 }
 861
 862 static struct platform_driver wm831x_boostp_driver = {
 863         .probe = wm831x_boostp_probe,
 864         .remove = __devexit_p(wm831x_boostp_remove),
 865         .driver         = {
 866                 .name   = "wm831x-boostp",
 867                 .owner  = THIS_MODULE,
 868         },
 869 };
 870
 871 /*
 872  * External Power Enable
 873  *
 874  * These aren't actually DCDCs but look like them in hardware so share
 875  * code.
 876  */
 877
 878 #define WM831X_EPE_BASE 6
 879
 880 static struct regulator_ops wm831x_epe_ops = {
 881         .is_enabled = regulator_is_enabled_regmap,
 882         .enable = regulator_enable_regmap,
 883         .disable = regulator_disable_regmap,
 884         .get_status = wm831x_dcdc_get_status,
 885 };
 886
 887 static __devinit int wm831x_epe_probe(struct platform_device *pdev)
 888 {
 889         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 890         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
 891         struct regulator_config config = { };
 892         int id = pdev->id % ARRAY_SIZE(pdata->epe);
 893         struct wm831x_dcdc *dcdc;
 894         int ret;
 895
 896         dev_dbg(&pdev->dev, "Probing EPE%d\n", id + 1);
 897
 898         dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), GFP_KERNEL);
 899         if (dcdc == NULL) {
 900                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 901                 return -ENOMEM;
 902         }
 903
 904         dcdc->wm831x = wm831x;
 905
 906         /* For current parts this is correct; probably need to revisit
 907          * in future.
 908          */
 909         snprintf(dcdc->name, sizeof(dcdc->name), "EPE%d", id + 1);
 910         dcdc->desc.name = dcdc->name;
 911         dcdc->desc.id = id + WM831X_EPE_BASE; /* Offset in DCDC registers */
 912         dcdc->desc.ops = &wm831x_epe_ops;
 913         dcdc->desc.type = REGULATOR_VOLTAGE;
 914         dcdc->desc.owner = THIS_MODULE;
 915         dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
 916         dcdc->desc.enable_mask = 1 << dcdc->desc.id;
 917
 918         config.dev = pdev->dev.parent;
 919         if (pdata)
 920                 config.init_data = pdata->epe[id];
 921         config.driver_data = dcdc;
 922         config.regmap = wm831x->regmap;
 923
 924         dcdc->regulator = regulator_register(&dcdc->desc, &config);
 925         if (IS_ERR(dcdc->regulator)) {
 926                 ret = PTR_ERR(dcdc->regulator);
 927                 dev_err(wm831x->dev, "Failed to register EPE%d: %d\n",
 928                         id + 1, ret);
 929                 goto err;
 930         }
 931
 932         platform_set_drvdata(pdev, dcdc);
 933
 934         return 0;
 935
 936 err:
 937         return ret;
 938 }
 939
 940 static __devexit int wm831x_epe_remove(struct platform_device *pdev)
 941 {
 942         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
 943
 944         platform_set_drvdata(pdev, NULL);
 945         regulator_unregister(dcdc->regulator);
 946
 947         return 0;
 948 }
 949
 950 static struct platform_driver wm831x_epe_driver = {
 951         .probe = wm831x_epe_probe,
 952         .remove = __devexit_p(wm831x_epe_remove),
 953         .driver         = {
 954                 .name   = "wm831x-epe",
 955                 .owner  = THIS_MODULE,
 956         },
 957 };
 958
 959 static int __init wm831x_dcdc_init(void)
 960 {
 961         int ret;
 962         ret = platform_driver_register(&wm831x_buckv_driver);
 963         if (ret != 0)
 964                 pr_err("Failed to register WM831x BUCKV driver: %d\n", ret);
 965
 966         ret = platform_driver_register(&wm831x_buckp_driver);
 967         if (ret != 0)
 968                 pr_err("Failed to register WM831x BUCKP driver: %d\n", ret);
 969
 970         ret = platform_driver_register(&wm831x_boostp_driver);
 971         if (ret != 0)
 972                 pr_err("Failed to register WM831x BOOST driver: %d\n", ret);
 973
 974         ret = platform_driver_register(&wm831x_epe_driver);
 975         if (ret != 0)
 976                 pr_err("Failed to register WM831x EPE driver: %d\n", ret);
 977
 978         return 0;
 979 }
 980 subsys_initcall(wm831x_dcdc_init);
 981
 982 static void __exit wm831x_dcdc_exit(void)
 983 {
 984         platform_driver_unregister(&wm831x_epe_driver);
 985         platform_driver_unregister(&wm831x_boostp_driver);
 986         platform_driver_unregister(&wm831x_buckp_driver);
 987         platform_driver_unregister(&wm831x_buckv_driver);
 988 }
 989 module_exit(wm831x_dcdc_exit);
 990
 991 /* Module information */
 992 MODULE_AUTHOR("Mark Brown");
 993 MODULE_DESCRIPTION("WM831x DC-DC convertor driver");
 994 MODULE_LICENSE("GPL");
 995 MODULE_ALIAS("platform:wm831x-buckv");
 996 MODULE_ALIAS("platform:wm831x-buckp");
 997 MODULE_ALIAS("platform:wm831x-epe");