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_select_min_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(struct regulator_dev *rdev,
 255                                     int min_uV, int max_uV, unsigned *selector)
 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 vsel, ret;
 262
 263         vsel = wm831x_buckv_select_min_voltage(rdev, min_uV, max_uV);
 264         if (vsel < 0)
 265                 return vsel;
 266
 267         *selector = vsel;
 268
 269         /* If this value is already set then do a GPIO update if we can */
 270         if (dcdc->dvs_gpio && dcdc->on_vsel == vsel)
 271                 return wm831x_buckv_set_dvs(rdev, 0);
 272
 273         if (dcdc->dvs_gpio && dcdc->dvs_vsel == vsel)
 274                 return wm831x_buckv_set_dvs(rdev, 1);
 275
 276         /* Always set the ON status to the minimum voltage */
 277         ret = wm831x_set_bits(wm831x, on_reg, WM831X_DC1_ON_VSEL_MASK, vsel);
 278         if (ret < 0)
 279                 return ret;
 280         dcdc->on_vsel = vsel;
 281
 282         if (!dcdc->dvs_gpio)
 283                 return ret;
 284
 285         /* Kick the voltage transition now */
 286         ret = wm831x_buckv_set_dvs(rdev, 0);
 287         if (ret < 0)
 288                 return ret;
 289
 290         /*
 291          * If this VSEL is higher than the last one we've seen then
 292          * remember it as the DVS VSEL.  This is optimised for CPUfreq
 293          * usage where we want to get to the highest voltage very
 294          * quickly.
 295          */
 296         if (vsel > dcdc->dvs_vsel) {
 297                 ret = wm831x_set_bits(wm831x, dvs_reg,
 298                                       WM831X_DC1_DVS_VSEL_MASK,
 299                                       dcdc->dvs_vsel);
 300                 if (ret == 0)
 301                         dcdc->dvs_vsel = vsel;
 302                 else
 303                         dev_warn(wm831x->dev,
 304                                  "Failed to set DCDC DVS VSEL: %d\n", ret);
 305         }
 306
 307         return 0;
 308 }
 309
 310 static int wm831x_buckv_set_suspend_voltage(struct regulator_dev *rdev,
 311                                             int uV)
 312 {
 313         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 314         struct wm831x *wm831x = dcdc->wm831x;
 315         u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
 316         int vsel;
 317
 318         vsel = wm831x_buckv_select_min_voltage(rdev, uV, uV);
 319         if (vsel < 0)
 320                 return vsel;
 321
 322         return wm831x_set_bits(wm831x, reg, WM831X_DC1_SLP_VSEL_MASK, vsel);
 323 }
 324
 325 static int wm831x_buckv_get_voltage_sel(struct regulator_dev *rdev)
 326 {
 327         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 328
 329         if (dcdc->dvs_gpio && dcdc->dvs_gpio_state)
 330                 return dcdc->dvs_vsel;
 331         else
 332                 return dcdc->on_vsel;
 333 }
 334
 335 /* Current limit options */
 336 static u16 wm831x_dcdc_ilim[] = {
 337         125, 250, 375, 500, 625, 750, 875, 1000
 338 };
 339
 340 static int wm831x_buckv_set_current_limit(struct regulator_dev *rdev,
 341                                            int min_uA, int max_uA)
 342 {
 343         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 344         struct wm831x *wm831x = dcdc->wm831x;
 345         u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2;
 346         int i;
 347
 348         for (i = 0; i < ARRAY_SIZE(wm831x_dcdc_ilim); i++) {
 349                 if ((min_uA <= wm831x_dcdc_ilim[i]) &&
 350                     (wm831x_dcdc_ilim[i] <= max_uA))
 351                         break;
 352         }
 353         if (i == ARRAY_SIZE(wm831x_dcdc_ilim))
 354                 return -EINVAL;
 355
 356         return wm831x_set_bits(wm831x, reg, WM831X_DC1_HC_THR_MASK,
 357                                i << WM831X_DC1_HC_THR_SHIFT);
 358 }
 359
 360 static int wm831x_buckv_get_current_limit(struct regulator_dev *rdev)
 361 {
 362         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 363         struct wm831x *wm831x = dcdc->wm831x;
 364         u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2;
 365         int val;
 366
 367         val = wm831x_reg_read(wm831x, reg);
 368         if (val < 0)
 369                 return val;
 370
 371         val = (val & WM831X_DC1_HC_THR_MASK) >> WM831X_DC1_HC_THR_SHIFT;
 372         return wm831x_dcdc_ilim[val];
 373 }
 374
 375 static struct regulator_ops wm831x_buckv_ops = {
 376         .set_voltage = wm831x_buckv_set_voltage,
 377         .get_voltage_sel = wm831x_buckv_get_voltage_sel,
 378         .list_voltage = wm831x_buckv_list_voltage,
 379         .set_suspend_voltage = wm831x_buckv_set_suspend_voltage,
 380         .set_current_limit = wm831x_buckv_set_current_limit,
 381         .get_current_limit = wm831x_buckv_get_current_limit,
 382
 383         .is_enabled = regulator_is_enabled_regmap,
 384         .enable = regulator_enable_regmap,
 385         .disable = regulator_disable_regmap,
 386         .get_status = wm831x_dcdc_get_status,
 387         .get_mode = wm831x_dcdc_get_mode,
 388         .set_mode = wm831x_dcdc_set_mode,
 389         .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
 390 };
 391
 392 /*
 393  * Set up DVS control.  We just log errors since we can still run
 394  * (with reduced performance) if we fail.
 395  */
 396 static __devinit void wm831x_buckv_dvs_init(struct wm831x_dcdc *dcdc,
 397                                             struct wm831x_buckv_pdata *pdata)
 398 {
 399         struct wm831x *wm831x = dcdc->wm831x;
 400         int ret;
 401         u16 ctrl;
 402
 403         if (!pdata || !pdata->dvs_gpio)
 404                 return;
 405
 406         /* gpiolib won't let us read the GPIO status so pick the higher
 407          * of the two existing voltages so we take it as platform data.
 408          */
 409         dcdc->dvs_gpio_state = pdata->dvs_init_state;
 410
 411         ret = gpio_request_one(pdata->dvs_gpio,
 412                                dcdc->dvs_gpio_state ? GPIOF_INIT_HIGH : 0,
 413                                "DCDC DVS");
 414         if (ret < 0) {
 415                 dev_err(wm831x->dev, "Failed to get %s DVS GPIO: %d\n",
 416                         dcdc->name, ret);
 417                 return;
 418         }
 419
 420         dcdc->dvs_gpio = pdata->dvs_gpio;
 421
 422         switch (pdata->dvs_control_src) {
 423         case 1:
 424                 ctrl = 2 << WM831X_DC1_DVS_SRC_SHIFT;
 425                 break;
 426         case 2:
 427                 ctrl = 3 << WM831X_DC1_DVS_SRC_SHIFT;
 428                 break;
 429         default:
 430                 dev_err(wm831x->dev, "Invalid DVS control source %d for %s\n",
 431                         pdata->dvs_control_src, dcdc->name);
 432                 return;
 433         }
 434
 435         /* If DVS_VSEL is set to the minimum value then raise it to ON_VSEL
 436          * to make bootstrapping a bit smoother.
 437          */
 438         if (!dcdc->dvs_vsel) {
 439                 ret = wm831x_set_bits(wm831x,
 440                                       dcdc->base + WM831X_DCDC_DVS_CONTROL,
 441                                       WM831X_DC1_DVS_VSEL_MASK, dcdc->on_vsel);
 442                 if (ret == 0)
 443                         dcdc->dvs_vsel = dcdc->on_vsel;
 444                 else
 445                         dev_warn(wm831x->dev, "Failed to set DVS_VSEL: %d\n",
 446                                  ret);
 447         }
 448
 449         ret = wm831x_set_bits(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL,
 450                               WM831X_DC1_DVS_SRC_MASK, ctrl);
 451         if (ret < 0) {
 452                 dev_err(wm831x->dev, "Failed to set %s DVS source: %d\n",
 453                         dcdc->name, ret);
 454         }
 455 }
 456
 457 static __devinit int wm831x_buckv_probe(struct platform_device *pdev)
 458 {
 459         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 460         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
 461         struct regulator_config config = { };
 462         int id;
 463         struct wm831x_dcdc *dcdc;
 464         struct resource *res;
 465         int ret, irq;
 466
 467         if (pdata && pdata->wm831x_num)
 468                 id = (pdata->wm831x_num * 10) + 1;
 469         else
 470                 id = 0;
 471         id = pdev->id - id;
 472
 473         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
 474
 475         dcdc = devm_kzalloc(&pdev->dev,  sizeof(struct wm831x_dcdc),
 476                             GFP_KERNEL);
 477         if (dcdc == NULL) {
 478                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 479                 return -ENOMEM;
 480         }
 481
 482         dcdc->wm831x = wm831x;
 483
 484         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 485         if (res == NULL) {
 486                 dev_err(&pdev->dev, "No I/O resource\n");
 487                 ret = -EINVAL;
 488                 goto err;
 489         }
 490         dcdc->base = res->start;
 491
 492         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
 493         dcdc->desc.name = dcdc->name;
 494
 495         snprintf(dcdc->supply_name, sizeof(dcdc->supply_name),
 496                  "DC%dVDD", id + 1);
 497         dcdc->desc.supply_name = dcdc->supply_name;
 498
 499         dcdc->desc.id = id;
 500         dcdc->desc.type = REGULATOR_VOLTAGE;
 501         dcdc->desc.n_voltages = WM831X_BUCKV_MAX_SELECTOR + 1;
 502         dcdc->desc.ops = &wm831x_buckv_ops;
 503         dcdc->desc.owner = THIS_MODULE;
 504         dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
 505         dcdc->desc.enable_mask = 1 << id;
 506
 507         ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG);
 508         if (ret < 0) {
 509                 dev_err(wm831x->dev, "Failed to read ON VSEL: %d\n", ret);
 510                 goto err;
 511         }
 512         dcdc->on_vsel = ret & WM831X_DC1_ON_VSEL_MASK;
 513
 514         ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL);
 515         if (ret < 0) {
 516                 dev_err(wm831x->dev, "Failed to read DVS VSEL: %d\n", ret);
 517                 goto err;
 518         }
 519         dcdc->dvs_vsel = ret & WM831X_DC1_DVS_VSEL_MASK;
 520
 521         if (pdata && pdata->dcdc[id])
 522                 wm831x_buckv_dvs_init(dcdc, pdata->dcdc[id]->driver_data);
 523
 524         config.dev = pdev->dev.parent;
 525         if (pdata)
 526                 config.init_data = pdata->dcdc[id];
 527         config.driver_data = dcdc;
 528         config.regmap = wm831x->regmap;
 529
 530         dcdc->regulator = regulator_register(&dcdc->desc, &config);
 531         if (IS_ERR(dcdc->regulator)) {
 532                 ret = PTR_ERR(dcdc->regulator);
 533                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
 534                         id + 1, ret);
 535                 goto err;
 536         }
 537
 538         irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
 539         ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
 540                                    IRQF_TRIGGER_RISING, dcdc->name, dcdc);
 541         if (ret != 0) {
 542                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
 543                         irq, ret);
 544                 goto err_regulator;
 545         }
 546
 547         irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "HC"));
 548         ret = request_threaded_irq(irq, NULL, wm831x_dcdc_oc_irq,
 549                                    IRQF_TRIGGER_RISING, dcdc->name, dcdc);
 550         if (ret != 0) {
 551                 dev_err(&pdev->dev, "Failed to request HC IRQ %d: %d\n",
 552                         irq, ret);
 553                 goto err_uv;
 554         }
 555
 556         platform_set_drvdata(pdev, dcdc);
 557
 558         return 0;
 559
 560 err_uv:
 561         free_irq(wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV")),
 562                  dcdc);
 563 err_regulator:
 564         regulator_unregister(dcdc->regulator);
 565 err:
 566         if (dcdc->dvs_gpio)
 567                 gpio_free(dcdc->dvs_gpio);
 568         return ret;
 569 }
 570
 571 static __devexit int wm831x_buckv_remove(struct platform_device *pdev)
 572 {
 573         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
 574         struct wm831x *wm831x = dcdc->wm831x;
 575
 576         platform_set_drvdata(pdev, NULL);
 577
 578         free_irq(wm831x_irq(wm831x, platform_get_irq_byname(pdev, "HC")),
 579                             dcdc);
 580         free_irq(wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV")),
 581                             dcdc);
 582         regulator_unregister(dcdc->regulator);
 583         if (dcdc->dvs_gpio)
 584                 gpio_free(dcdc->dvs_gpio);
 585
 586         return 0;
 587 }
 588
 589 static struct platform_driver wm831x_buckv_driver = {
 590         .probe = wm831x_buckv_probe,
 591         .remove = __devexit_p(wm831x_buckv_remove),
 592         .driver         = {
 593                 .name   = "wm831x-buckv",
 594                 .owner  = THIS_MODULE,
 595         },
 596 };
 597
 598 /*
 599  * BUCKP specifics
 600  */
 601
 602 static int wm831x_buckp_list_voltage(struct regulator_dev *rdev,
 603                                       unsigned selector)
 604 {
 605         if (selector <= WM831X_BUCKP_MAX_SELECTOR)
 606                 return 850000 + (selector * 25000);
 607         else
 608                 return -EINVAL;
 609 }
 610
 611 static int wm831x_buckp_set_voltage_int(struct regulator_dev *rdev, int reg,
 612                                         int min_uV, int max_uV, int *selector)
 613 {
 614         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 615         struct wm831x *wm831x = dcdc->wm831x;
 616         u16 vsel;
 617
 618         if (min_uV <= 34000000)
 619                 vsel = (min_uV - 850000) / 25000;
 620         else
 621                 return -EINVAL;
 622
 623         if (wm831x_buckp_list_voltage(rdev, vsel) > max_uV)
 624                 return -EINVAL;
 625
 626         *selector = vsel;
 627
 628         return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, vsel);
 629 }
 630
 631 static int wm831x_buckp_set_voltage(struct regulator_dev *rdev,
 632                                     int min_uV, int max_uV,
 633                                     unsigned *selector)
 634 {
 635         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 636         u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
 637
 638         return wm831x_buckp_set_voltage_int(rdev, reg, min_uV, max_uV,
 639                                             selector);
 640 }
 641
 642 static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev,
 643                                             int uV)
 644 {
 645         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 646         u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
 647         unsigned selector;
 648
 649         return wm831x_buckp_set_voltage_int(rdev, reg, uV, uV, &selector);
 650 }
 651
 652 static struct regulator_ops wm831x_buckp_ops = {
 653         .set_voltage = wm831x_buckp_set_voltage,
 654         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 655         .list_voltage = wm831x_buckp_list_voltage,
 656         .set_suspend_voltage = wm831x_buckp_set_suspend_voltage,
 657
 658         .is_enabled = regulator_is_enabled_regmap,
 659         .enable = regulator_enable_regmap,
 660         .disable = regulator_disable_regmap,
 661         .get_status = wm831x_dcdc_get_status,
 662         .get_mode = wm831x_dcdc_get_mode,
 663         .set_mode = wm831x_dcdc_set_mode,
 664         .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
 665 };
 666
 667 static __devinit int wm831x_buckp_probe(struct platform_device *pdev)
 668 {
 669         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 670         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
 671         struct regulator_config config = { };
 672         int id;
 673         struct wm831x_dcdc *dcdc;
 674         struct resource *res;
 675         int ret, irq;
 676
 677         if (pdata && pdata->wm831x_num)
 678                 id = (pdata->wm831x_num * 10) + 1;
 679         else
 680                 id = 0;
 681         id = pdev->id - id;
 682
 683         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
 684
 685         dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc),
 686                             GFP_KERNEL);
 687         if (dcdc == NULL) {
 688                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 689                 return -ENOMEM;
 690         }
 691
 692         dcdc->wm831x = wm831x;
 693
 694         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 695         if (res == NULL) {
 696                 dev_err(&pdev->dev, "No I/O resource\n");
 697                 ret = -EINVAL;
 698                 goto err;
 699         }
 700         dcdc->base = res->start;
 701
 702         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
 703         dcdc->desc.name = dcdc->name;
 704
 705         snprintf(dcdc->supply_name, sizeof(dcdc->supply_name),
 706                  "DC%dVDD", id + 1);
 707         dcdc->desc.supply_name = dcdc->supply_name;
 708
 709         dcdc->desc.id = id;
 710         dcdc->desc.type = REGULATOR_VOLTAGE;
 711         dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1;
 712         dcdc->desc.ops = &wm831x_buckp_ops;
 713         dcdc->desc.owner = THIS_MODULE;
 714         dcdc->desc.vsel_reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
 715         dcdc->desc.vsel_mask = WM831X_DC3_ON_VSEL_MASK;
 716         dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
 717         dcdc->desc.enable_mask = 1 << id;
 718
 719         config.dev = pdev->dev.parent;
 720         if (pdata)
 721                 config.init_data = pdata->dcdc[id];
 722         config.driver_data = dcdc;
 723         config.regmap = wm831x->regmap;
 724
 725         dcdc->regulator = regulator_register(&dcdc->desc, &config);
 726         if (IS_ERR(dcdc->regulator)) {
 727                 ret = PTR_ERR(dcdc->regulator);
 728                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
 729                         id + 1, ret);
 730                 goto err;
 731         }
 732
 733         irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
 734         ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
 735                                    IRQF_TRIGGER_RISING, dcdc->name, dcdc);
 736         if (ret != 0) {
 737                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
 738                         irq, ret);
 739                 goto err_regulator;
 740         }
 741
 742         platform_set_drvdata(pdev, dcdc);
 743
 744         return 0;
 745
 746 err_regulator:
 747         regulator_unregister(dcdc->regulator);
 748 err:
 749         return ret;
 750 }
 751
 752 static __devexit int wm831x_buckp_remove(struct platform_device *pdev)
 753 {
 754         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
 755
 756         platform_set_drvdata(pdev, NULL);
 757
 758         free_irq(wm831x_irq(dcdc->wm831x, platform_get_irq_byname(pdev, "UV")),
 759                             dcdc);
 760         regulator_unregister(dcdc->regulator);
 761
 762         return 0;
 763 }
 764
 765 static struct platform_driver wm831x_buckp_driver = {
 766         .probe = wm831x_buckp_probe,
 767         .remove = __devexit_p(wm831x_buckp_remove),
 768         .driver         = {
 769                 .name   = "wm831x-buckp",
 770                 .owner  = THIS_MODULE,
 771         },
 772 };
 773
 774 /*
 775  * DCDC boost convertors
 776  */
 777
 778 static int wm831x_boostp_get_status(struct regulator_dev *rdev)
 779 {
 780         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 781         struct wm831x *wm831x = dcdc->wm831x;
 782         int ret;
 783
 784         /* First, check for errors */
 785         ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
 786         if (ret < 0)
 787                 return ret;
 788
 789         if (ret & (1 << rdev_get_id(rdev))) {
 790                 dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
 791                         rdev_get_id(rdev) + 1);
 792                 return REGULATOR_STATUS_ERROR;
 793         }
 794
 795         /* Is the regulator on? */
 796         ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
 797         if (ret < 0)
 798                 return ret;
 799         if (ret & (1 << rdev_get_id(rdev)))
 800                 return REGULATOR_STATUS_ON;
 801         else
 802                 return REGULATOR_STATUS_OFF;
 803 }
 804
 805 static struct regulator_ops wm831x_boostp_ops = {
 806         .get_status = wm831x_boostp_get_status,
 807
 808         .is_enabled = regulator_is_enabled_regmap,
 809         .enable = regulator_enable_regmap,
 810         .disable = regulator_disable_regmap,
 811 };
 812
 813 static __devinit int wm831x_boostp_probe(struct platform_device *pdev)
 814 {
 815         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 816         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
 817         struct regulator_config config = { };
 818         int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
 819         struct wm831x_dcdc *dcdc;
 820         struct resource *res;
 821         int ret, irq;
 822
 823         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
 824
 825         if (pdata == NULL || pdata->dcdc[id] == NULL)
 826                 return -ENODEV;
 827
 828         dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), GFP_KERNEL);
 829         if (dcdc == NULL) {
 830                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 831                 return -ENOMEM;
 832         }
 833
 834         dcdc->wm831x = wm831x;
 835
 836         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 837         if (res == NULL) {
 838                 dev_err(&pdev->dev, "No I/O resource\n");
 839                 ret = -EINVAL;
 840                 goto err;
 841         }
 842         dcdc->base = res->start;
 843
 844         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
 845         dcdc->desc.name = dcdc->name;
 846         dcdc->desc.id = id;
 847         dcdc->desc.type = REGULATOR_VOLTAGE;
 848         dcdc->desc.ops = &wm831x_boostp_ops;
 849         dcdc->desc.owner = THIS_MODULE;
 850         dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
 851         dcdc->desc.enable_mask = 1 << id;
 852
 853         config.dev = pdev->dev.parent;
 854         if (pdata)
 855                 config.init_data = pdata->dcdc[id];
 856         config.driver_data = dcdc;
 857         config.regmap = wm831x->regmap;
 858
 859         dcdc->regulator = regulator_register(&dcdc->desc, &config);
 860         if (IS_ERR(dcdc->regulator)) {
 861                 ret = PTR_ERR(dcdc->regulator);
 862                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
 863                         id + 1, ret);
 864                 goto err;
 865         }
 866
 867         irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
 868         ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
 869                                    IRQF_TRIGGER_RISING, dcdc->name,
 870                                    dcdc);
 871         if (ret != 0) {
 872                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
 873                         irq, ret);
 874                 goto err_regulator;
 875         }
 876
 877         platform_set_drvdata(pdev, dcdc);
 878
 879         return 0;
 880
 881 err_regulator:
 882         regulator_unregister(dcdc->regulator);
 883 err:
 884         return ret;
 885 }
 886
 887 static __devexit int wm831x_boostp_remove(struct platform_device *pdev)
 888 {
 889         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
 890
 891         platform_set_drvdata(pdev, NULL);
 892
 893         free_irq(wm831x_irq(dcdc->wm831x, platform_get_irq_byname(pdev, "UV")),
 894                  dcdc);
 895         regulator_unregister(dcdc->regulator);
 896
 897         return 0;
 898 }
 899
 900 static struct platform_driver wm831x_boostp_driver = {
 901         .probe = wm831x_boostp_probe,
 902         .remove = __devexit_p(wm831x_boostp_remove),
 903         .driver         = {
 904                 .name   = "wm831x-boostp",
 905                 .owner  = THIS_MODULE,
 906         },
 907 };
 908
 909 /*
 910  * External Power Enable
 911  *
 912  * These aren't actually DCDCs but look like them in hardware so share
 913  * code.
 914  */
 915
 916 #define WM831X_EPE_BASE 6
 917
 918 static struct regulator_ops wm831x_epe_ops = {
 919         .is_enabled = regulator_is_enabled_regmap,
 920         .enable = regulator_enable_regmap,
 921         .disable = regulator_disable_regmap,
 922         .get_status = wm831x_dcdc_get_status,
 923 };
 924
 925 static __devinit int wm831x_epe_probe(struct platform_device *pdev)
 926 {
 927         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 928         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
 929         struct regulator_config config = { };
 930         int id = pdev->id % ARRAY_SIZE(pdata->epe);
 931         struct wm831x_dcdc *dcdc;
 932         int ret;
 933
 934         dev_dbg(&pdev->dev, "Probing EPE%d\n", id + 1);
 935
 936         dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), GFP_KERNEL);
 937         if (dcdc == NULL) {
 938                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 939                 return -ENOMEM;
 940         }
 941
 942         dcdc->wm831x = wm831x;
 943
 944         /* For current parts this is correct; probably need to revisit
 945          * in future.
 946          */
 947         snprintf(dcdc->name, sizeof(dcdc->name), "EPE%d", id + 1);
 948         dcdc->desc.name = dcdc->name;
 949         dcdc->desc.id = id + WM831X_EPE_BASE; /* Offset in DCDC registers */
 950         dcdc->desc.ops = &wm831x_epe_ops;
 951         dcdc->desc.type = REGULATOR_VOLTAGE;
 952         dcdc->desc.owner = THIS_MODULE;
 953         dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
 954         dcdc->desc.enable_mask = 1 << dcdc->desc.id;
 955
 956         config.dev = pdev->dev.parent;
 957         if (pdata)
 958                 config.init_data = pdata->epe[id];
 959         config.driver_data = dcdc;
 960         config.regmap = wm831x->regmap;
 961
 962         dcdc->regulator = regulator_register(&dcdc->desc, &config);
 963         if (IS_ERR(dcdc->regulator)) {
 964                 ret = PTR_ERR(dcdc->regulator);
 965                 dev_err(wm831x->dev, "Failed to register EPE%d: %d\n",
 966                         id + 1, ret);
 967                 goto err;
 968         }
 969
 970         platform_set_drvdata(pdev, dcdc);
 971
 972         return 0;
 973
 974 err:
 975         return ret;
 976 }
 977
 978 static __devexit int wm831x_epe_remove(struct platform_device *pdev)
 979 {
 980         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
 981
 982         platform_set_drvdata(pdev, NULL);
 983         regulator_unregister(dcdc->regulator);
 984
 985         return 0;
 986 }
 987
 988 static struct platform_driver wm831x_epe_driver = {
 989         .probe = wm831x_epe_probe,
 990         .remove = __devexit_p(wm831x_epe_remove),
 991         .driver         = {
 992                 .name   = "wm831x-epe",
 993                 .owner  = THIS_MODULE,
 994         },
 995 };
 996
 997 static int __init wm831x_dcdc_init(void)
 998 {
 999         int ret;
1000         ret = platform_driver_register(&wm831x_buckv_driver);
1001         if (ret != 0)
1002                 pr_err("Failed to register WM831x BUCKV driver: %d\n", ret);
1003
1004         ret = platform_driver_register(&wm831x_buckp_driver);
1005         if (ret != 0)
1006                 pr_err("Failed to register WM831x BUCKP driver: %d\n", ret);
1007
1008         ret = platform_driver_register(&wm831x_boostp_driver);
1009         if (ret != 0)
1010                 pr_err("Failed to register WM831x BOOST driver: %d\n", ret);
1011
1012         ret = platform_driver_register(&wm831x_epe_driver);
1013         if (ret != 0)
1014                 pr_err("Failed to register WM831x EPE driver: %d\n", ret);
1015
1016         return 0;
1017 }
1018 subsys_initcall(wm831x_dcdc_init);
1019
1020 static void __exit wm831x_dcdc_exit(void)
1021 {
1022         platform_driver_unregister(&wm831x_epe_driver);
1023         platform_driver_unregister(&wm831x_boostp_driver);
1024         platform_driver_unregister(&wm831x_buckp_driver);
1025         platform_driver_unregister(&wm831x_buckv_driver);
1026 }
1027 module_exit(wm831x_dcdc_exit);
1028
1029 /* Module information */
1030 MODULE_AUTHOR("Mark Brown");
1031 MODULE_DESCRIPTION("WM831x DC-DC convertor driver");
1032 MODULE_LICENSE("GPL");
1033 MODULE_ALIAS("platform:wm831x-buckv");
1034 MODULE_ALIAS("platform:wm831x-buckp");
1035 MODULE_ALIAS("platform:wm831x-epe");