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 = 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 wm831x_dcdc *dcdc,
 391                                             struct wm831x_buckv_pdata *pdata)
 392 {
 393         struct wm831x *wm831x = dcdc->wm831x;
 394         int ret;
 395         u16 ctrl;
 396
 397         if (!pdata || !pdata->dvs_gpio)
 398                 return;
 399
 400         /* gpiolib won't let us read the GPIO status so pick the higher
 401          * of the two existing voltages so we take it as platform data.
 402          */
 403         dcdc->dvs_gpio_state = pdata->dvs_init_state;
 404
 405         ret = gpio_request_one(pdata->dvs_gpio,
 406                                dcdc->dvs_gpio_state ? GPIOF_INIT_HIGH : 0,
 407                                "DCDC DVS");
 408         if (ret < 0) {
 409                 dev_err(wm831x->dev, "Failed to get %s DVS GPIO: %d\n",
 410                         dcdc->name, ret);
 411                 return;
 412         }
 413
 414         dcdc->dvs_gpio = pdata->dvs_gpio;
 415
 416         switch (pdata->dvs_control_src) {
 417         case 1:
 418                 ctrl = 2 << WM831X_DC1_DVS_SRC_SHIFT;
 419                 break;
 420         case 2:
 421                 ctrl = 3 << WM831X_DC1_DVS_SRC_SHIFT;
 422                 break;
 423         default:
 424                 dev_err(wm831x->dev, "Invalid DVS control source %d for %s\n",
 425                         pdata->dvs_control_src, dcdc->name);
 426                 return;
 427         }
 428
 429         /* If DVS_VSEL is set to the minimum value then raise it to ON_VSEL
 430          * to make bootstrapping a bit smoother.
 431          */
 432         if (!dcdc->dvs_vsel) {
 433                 ret = wm831x_set_bits(wm831x,
 434                                       dcdc->base + WM831X_DCDC_DVS_CONTROL,
 435                                       WM831X_DC1_DVS_VSEL_MASK, dcdc->on_vsel);
 436                 if (ret == 0)
 437                         dcdc->dvs_vsel = dcdc->on_vsel;
 438                 else
 439                         dev_warn(wm831x->dev, "Failed to set DVS_VSEL: %d\n",
 440                                  ret);
 441         }
 442
 443         ret = wm831x_set_bits(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL,
 444                               WM831X_DC1_DVS_SRC_MASK, ctrl);
 445         if (ret < 0) {
 446                 dev_err(wm831x->dev, "Failed to set %s DVS source: %d\n",
 447                         dcdc->name, ret);
 448         }
 449 }
 450
 451 static int wm831x_buckv_probe(struct platform_device *pdev)
 452 {
 453         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 454         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
 455         struct regulator_config config = { };
 456         int id;
 457         struct wm831x_dcdc *dcdc;
 458         struct resource *res;
 459         int ret, irq;
 460
 461         if (pdata && pdata->wm831x_num)
 462                 id = (pdata->wm831x_num * 10) + 1;
 463         else
 464                 id = 0;
 465         id = pdev->id - id;
 466
 467         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
 468
 469         dcdc = devm_kzalloc(&pdev->dev,  sizeof(struct wm831x_dcdc),
 470                             GFP_KERNEL);
 471         if (dcdc == NULL) {
 472                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 473                 return -ENOMEM;
 474         }
 475
 476         dcdc->wm831x = wm831x;
 477
 478         res = platform_get_resource(pdev, IORESOURCE_REG, 0);
 479         if (res == NULL) {
 480                 dev_err(&pdev->dev, "No REG resource\n");
 481                 ret = -EINVAL;
 482                 goto err;
 483         }
 484         dcdc->base = res->start;
 485
 486         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
 487         dcdc->desc.name = dcdc->name;
 488
 489         snprintf(dcdc->supply_name, sizeof(dcdc->supply_name),
 490                  "DC%dVDD", id + 1);
 491         dcdc->desc.supply_name = dcdc->supply_name;
 492
 493         dcdc->desc.id = id;
 494         dcdc->desc.type = REGULATOR_VOLTAGE;
 495         dcdc->desc.n_voltages = WM831X_BUCKV_MAX_SELECTOR + 1;
 496         dcdc->desc.ops = &wm831x_buckv_ops;
 497         dcdc->desc.owner = THIS_MODULE;
 498         dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
 499         dcdc->desc.enable_mask = 1 << id;
 500
 501         ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG);
 502         if (ret < 0) {
 503                 dev_err(wm831x->dev, "Failed to read ON VSEL: %d\n", ret);
 504                 goto err;
 505         }
 506         dcdc->on_vsel = ret & WM831X_DC1_ON_VSEL_MASK;
 507
 508         ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL);
 509         if (ret < 0) {
 510                 dev_err(wm831x->dev, "Failed to read DVS VSEL: %d\n", ret);
 511                 goto err;
 512         }
 513         dcdc->dvs_vsel = ret & WM831X_DC1_DVS_VSEL_MASK;
 514
 515         if (pdata && pdata->dcdc[id])
 516                 wm831x_buckv_dvs_init(dcdc, 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 = regulator_register(&dcdc->desc, &config);
 525         if (IS_ERR(dcdc->regulator)) {
 526                 ret = PTR_ERR(dcdc->regulator);
 527                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
 528                         id + 1, ret);
 529                 goto err;
 530         }
 531
 532         irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
 533         ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
 534                                    IRQF_TRIGGER_RISING, dcdc->name, dcdc);
 535         if (ret != 0) {
 536                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
 537                         irq, ret);
 538                 goto err_regulator;
 539         }
 540
 541         irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "HC"));
 542         ret = request_threaded_irq(irq, NULL, wm831x_dcdc_oc_irq,
 543                                    IRQF_TRIGGER_RISING, dcdc->name, dcdc);
 544         if (ret != 0) {
 545                 dev_err(&pdev->dev, "Failed to request HC IRQ %d: %d\n",
 546                         irq, ret);
 547                 goto err_uv;
 548         }
 549
 550         platform_set_drvdata(pdev, dcdc);
 551
 552         return 0;
 553
 554 err_uv:
 555         free_irq(wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV")),
 556                  dcdc);
 557 err_regulator:
 558         regulator_unregister(dcdc->regulator);
 559 err:
 560         if (dcdc->dvs_gpio)
 561                 gpio_free(dcdc->dvs_gpio);
 562         return ret;
 563 }
 564
 565 static int wm831x_buckv_remove(struct platform_device *pdev)
 566 {
 567         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
 568         struct wm831x *wm831x = dcdc->wm831x;
 569
 570         platform_set_drvdata(pdev, NULL);
 571
 572         free_irq(wm831x_irq(wm831x, platform_get_irq_byname(pdev, "HC")),
 573                             dcdc);
 574         free_irq(wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV")),
 575                             dcdc);
 576         regulator_unregister(dcdc->regulator);
 577         if (dcdc->dvs_gpio)
 578                 gpio_free(dcdc->dvs_gpio);
 579
 580         return 0;
 581 }
 582
 583 static struct platform_driver wm831x_buckv_driver = {
 584         .probe = wm831x_buckv_probe,
 585         .remove = wm831x_buckv_remove,
 586         .driver         = {
 587                 .name   = "wm831x-buckv",
 588                 .owner  = THIS_MODULE,
 589         },
 590 };
 591
 592 /*
 593  * BUCKP specifics
 594  */
 595
 596 static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev, int uV)
 597 {
 598         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 599         struct wm831x *wm831x = dcdc->wm831x;
 600         u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
 601         int sel;
 602
 603         sel = regulator_map_voltage_linear(rdev, uV, uV);
 604         if (sel < 0)
 605                 return sel;
 606
 607         return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, sel);
 608 }
 609
 610 static struct regulator_ops wm831x_buckp_ops = {
 611         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 612         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 613         .list_voltage = regulator_list_voltage_linear,
 614         .map_voltage = regulator_map_voltage_linear,
 615         .set_suspend_voltage = wm831x_buckp_set_suspend_voltage,
 616
 617         .is_enabled = regulator_is_enabled_regmap,
 618         .enable = regulator_enable_regmap,
 619         .disable = regulator_disable_regmap,
 620         .get_status = wm831x_dcdc_get_status,
 621         .get_mode = wm831x_dcdc_get_mode,
 622         .set_mode = wm831x_dcdc_set_mode,
 623         .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
 624 };
 625
 626 static int wm831x_buckp_probe(struct platform_device *pdev)
 627 {
 628         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 629         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
 630         struct regulator_config config = { };
 631         int id;
 632         struct wm831x_dcdc *dcdc;
 633         struct resource *res;
 634         int ret, irq;
 635
 636         if (pdata && pdata->wm831x_num)
 637                 id = (pdata->wm831x_num * 10) + 1;
 638         else
 639                 id = 0;
 640         id = pdev->id - id;
 641
 642         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
 643
 644         dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc),
 645                             GFP_KERNEL);
 646         if (dcdc == NULL) {
 647                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 648                 return -ENOMEM;
 649         }
 650
 651         dcdc->wm831x = wm831x;
 652
 653         res = platform_get_resource(pdev, IORESOURCE_REG, 0);
 654         if (res == NULL) {
 655                 dev_err(&pdev->dev, "No REG resource\n");
 656                 ret = -EINVAL;
 657                 goto err;
 658         }
 659         dcdc->base = res->start;
 660
 661         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
 662         dcdc->desc.name = dcdc->name;
 663
 664         snprintf(dcdc->supply_name, sizeof(dcdc->supply_name),
 665                  "DC%dVDD", id + 1);
 666         dcdc->desc.supply_name = dcdc->supply_name;
 667
 668         dcdc->desc.id = id;
 669         dcdc->desc.type = REGULATOR_VOLTAGE;
 670         dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1;
 671         dcdc->desc.ops = &wm831x_buckp_ops;
 672         dcdc->desc.owner = THIS_MODULE;
 673         dcdc->desc.vsel_reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
 674         dcdc->desc.vsel_mask = WM831X_DC3_ON_VSEL_MASK;
 675         dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
 676         dcdc->desc.enable_mask = 1 << id;
 677         dcdc->desc.min_uV = 850000;
 678         dcdc->desc.uV_step = 25000;
 679
 680         config.dev = pdev->dev.parent;
 681         if (pdata)
 682                 config.init_data = pdata->dcdc[id];
 683         config.driver_data = dcdc;
 684         config.regmap = wm831x->regmap;
 685
 686         dcdc->regulator = regulator_register(&dcdc->desc, &config);
 687         if (IS_ERR(dcdc->regulator)) {
 688                 ret = PTR_ERR(dcdc->regulator);
 689                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
 690                         id + 1, ret);
 691                 goto err;
 692         }
 693
 694         irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
 695         ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
 696                                    IRQF_TRIGGER_RISING, dcdc->name, dcdc);
 697         if (ret != 0) {
 698                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
 699                         irq, ret);
 700                 goto err_regulator;
 701         }
 702
 703         platform_set_drvdata(pdev, dcdc);
 704
 705         return 0;
 706
 707 err_regulator:
 708         regulator_unregister(dcdc->regulator);
 709 err:
 710         return ret;
 711 }
 712
 713 static int wm831x_buckp_remove(struct platform_device *pdev)
 714 {
 715         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
 716
 717         platform_set_drvdata(pdev, NULL);
 718
 719         free_irq(wm831x_irq(dcdc->wm831x, platform_get_irq_byname(pdev, "UV")),
 720                             dcdc);
 721         regulator_unregister(dcdc->regulator);
 722
 723         return 0;
 724 }
 725
 726 static struct platform_driver wm831x_buckp_driver = {
 727         .probe = wm831x_buckp_probe,
 728         .remove = wm831x_buckp_remove,
 729         .driver         = {
 730                 .name   = "wm831x-buckp",
 731                 .owner  = THIS_MODULE,
 732         },
 733 };
 734
 735 /*
 736  * DCDC boost convertors
 737  */
 738
 739 static int wm831x_boostp_get_status(struct regulator_dev *rdev)
 740 {
 741         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 742         struct wm831x *wm831x = dcdc->wm831x;
 743         int ret;
 744
 745         /* First, check for errors */
 746         ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
 747         if (ret < 0)
 748                 return ret;
 749
 750         if (ret & (1 << rdev_get_id(rdev))) {
 751                 dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
 752                         rdev_get_id(rdev) + 1);
 753                 return REGULATOR_STATUS_ERROR;
 754         }
 755
 756         /* Is the regulator on? */
 757         ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
 758         if (ret < 0)
 759                 return ret;
 760         if (ret & (1 << rdev_get_id(rdev)))
 761                 return REGULATOR_STATUS_ON;
 762         else
 763                 return REGULATOR_STATUS_OFF;
 764 }
 765
 766 static struct regulator_ops wm831x_boostp_ops = {
 767         .get_status = wm831x_boostp_get_status,
 768
 769         .is_enabled = regulator_is_enabled_regmap,
 770         .enable = regulator_enable_regmap,
 771         .disable = regulator_disable_regmap,
 772 };
 773
 774 static int wm831x_boostp_probe(struct platform_device *pdev)
 775 {
 776         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 777         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
 778         struct regulator_config config = { };
 779         int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
 780         struct wm831x_dcdc *dcdc;
 781         struct resource *res;
 782         int ret, irq;
 783
 784         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
 785
 786         if (pdata == NULL || pdata->dcdc[id] == NULL)
 787                 return -ENODEV;
 788
 789         dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), GFP_KERNEL);
 790         if (dcdc == NULL) {
 791                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 792                 return -ENOMEM;
 793         }
 794
 795         dcdc->wm831x = wm831x;
 796
 797         res = platform_get_resource(pdev, IORESOURCE_REG, 0);
 798         if (res == NULL) {
 799                 dev_err(&pdev->dev, "No REG resource\n");
 800                 ret = -EINVAL;
 801                 goto err;
 802         }
 803         dcdc->base = res->start;
 804
 805         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
 806         dcdc->desc.name = dcdc->name;
 807         dcdc->desc.id = id;
 808         dcdc->desc.type = REGULATOR_VOLTAGE;
 809         dcdc->desc.ops = &wm831x_boostp_ops;
 810         dcdc->desc.owner = THIS_MODULE;
 811         dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
 812         dcdc->desc.enable_mask = 1 << id;
 813
 814         config.dev = pdev->dev.parent;
 815         if (pdata)
 816                 config.init_data = pdata->dcdc[id];
 817         config.driver_data = dcdc;
 818         config.regmap = wm831x->regmap;
 819
 820         dcdc->regulator = regulator_register(&dcdc->desc, &config);
 821         if (IS_ERR(dcdc->regulator)) {
 822                 ret = PTR_ERR(dcdc->regulator);
 823                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
 824                         id + 1, ret);
 825                 goto err;
 826         }
 827
 828         irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
 829         ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
 830                                    IRQF_TRIGGER_RISING, dcdc->name,
 831                                    dcdc);
 832         if (ret != 0) {
 833                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
 834                         irq, ret);
 835                 goto err_regulator;
 836         }
 837
 838         platform_set_drvdata(pdev, dcdc);
 839
 840         return 0;
 841
 842 err_regulator:
 843         regulator_unregister(dcdc->regulator);
 844 err:
 845         return ret;
 846 }
 847
 848 static int wm831x_boostp_remove(struct platform_device *pdev)
 849 {
 850         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
 851
 852         platform_set_drvdata(pdev, NULL);
 853
 854         free_irq(wm831x_irq(dcdc->wm831x, platform_get_irq_byname(pdev, "UV")),
 855                  dcdc);
 856         regulator_unregister(dcdc->regulator);
 857
 858         return 0;
 859 }
 860
 861 static struct platform_driver wm831x_boostp_driver = {
 862         .probe = wm831x_boostp_probe,
 863         .remove = wm831x_boostp_remove,
 864         .driver         = {
 865                 .name   = "wm831x-boostp",
 866                 .owner  = THIS_MODULE,
 867         },
 868 };
 869
 870 /*
 871  * External Power Enable
 872  *
 873  * These aren't actually DCDCs but look like them in hardware so share
 874  * code.
 875  */
 876
 877 #define WM831X_EPE_BASE 6
 878
 879 static struct regulator_ops wm831x_epe_ops = {
 880         .is_enabled = regulator_is_enabled_regmap,
 881         .enable = regulator_enable_regmap,
 882         .disable = regulator_disable_regmap,
 883         .get_status = wm831x_dcdc_get_status,
 884 };
 885
 886 static int wm831x_epe_probe(struct platform_device *pdev)
 887 {
 888         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 889         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
 890         struct regulator_config config = { };
 891         int id = pdev->id % ARRAY_SIZE(pdata->epe);
 892         struct wm831x_dcdc *dcdc;
 893         int ret;
 894
 895         dev_dbg(&pdev->dev, "Probing EPE%d\n", id + 1);
 896
 897         dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), GFP_KERNEL);
 898         if (dcdc == NULL) {
 899                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 900                 return -ENOMEM;
 901         }
 902
 903         dcdc->wm831x = wm831x;
 904
 905         /* For current parts this is correct; probably need to revisit
 906          * in future.
 907          */
 908         snprintf(dcdc->name, sizeof(dcdc->name), "EPE%d", id + 1);
 909         dcdc->desc.name = dcdc->name;
 910         dcdc->desc.id = id + WM831X_EPE_BASE; /* Offset in DCDC registers */
 911         dcdc->desc.ops = &wm831x_epe_ops;
 912         dcdc->desc.type = REGULATOR_VOLTAGE;
 913         dcdc->desc.owner = THIS_MODULE;
 914         dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
 915         dcdc->desc.enable_mask = 1 << dcdc->desc.id;
 916
 917         config.dev = pdev->dev.parent;
 918         if (pdata)
 919                 config.init_data = pdata->epe[id];
 920         config.driver_data = dcdc;
 921         config.regmap = wm831x->regmap;
 922
 923         dcdc->regulator = regulator_register(&dcdc->desc, &config);
 924         if (IS_ERR(dcdc->regulator)) {
 925                 ret = PTR_ERR(dcdc->regulator);
 926                 dev_err(wm831x->dev, "Failed to register EPE%d: %d\n",
 927                         id + 1, ret);
 928                 goto err;
 929         }
 930
 931         platform_set_drvdata(pdev, dcdc);
 932
 933         return 0;
 934
 935 err:
 936         return ret;
 937 }
 938
 939 static int wm831x_epe_remove(struct platform_device *pdev)
 940 {
 941         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
 942
 943         platform_set_drvdata(pdev, NULL);
 944         regulator_unregister(dcdc->regulator);
 945
 946         return 0;
 947 }
 948
 949 static struct platform_driver wm831x_epe_driver = {
 950         .probe = wm831x_epe_probe,
 951         .remove = wm831x_epe_remove,
 952         .driver         = {
 953                 .name   = "wm831x-epe",
 954                 .owner  = THIS_MODULE,
 955         },
 956 };
 957
 958 static int __init wm831x_dcdc_init(void)
 959 {
 960         int ret;
 961         ret = platform_driver_register(&wm831x_buckv_driver);
 962         if (ret != 0)
 963                 pr_err("Failed to register WM831x BUCKV driver: %d\n", ret);
 964
 965         ret = platform_driver_register(&wm831x_buckp_driver);
 966         if (ret != 0)
 967                 pr_err("Failed to register WM831x BUCKP driver: %d\n", ret);
 968
 969         ret = platform_driver_register(&wm831x_boostp_driver);
 970         if (ret != 0)
 971                 pr_err("Failed to register WM831x BOOST driver: %d\n", ret);
 972
 973         ret = platform_driver_register(&wm831x_epe_driver);
 974         if (ret != 0)
 975                 pr_err("Failed to register WM831x EPE driver: %d\n", ret);
 976
 977         return 0;
 978 }
 979 subsys_initcall(wm831x_dcdc_init);
 980
 981 static void __exit wm831x_dcdc_exit(void)
 982 {
 983         platform_driver_unregister(&wm831x_epe_driver);
 984         platform_driver_unregister(&wm831x_boostp_driver);
 985         platform_driver_unregister(&wm831x_buckp_driver);
 986         platform_driver_unregister(&wm831x_buckv_driver);
 987 }
 988 module_exit(wm831x_dcdc_exit);
 989
 990 /* Module information */
 991 MODULE_AUTHOR("Mark Brown");
 992 MODULE_DESCRIPTION("WM831x DC-DC convertor driver");
 993 MODULE_LICENSE("GPL");
 994 MODULE_ALIAS("platform:wm831x-buckv");
 995 MODULE_ALIAS("platform:wm831x-buckp");
 996 MODULE_ALIAS("platform:wm831x-boostp");
 997 MODULE_ALIAS("platform:wm831x-epe");