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   1 /*
   2  * wm831x-dcdc.c  --  DC-DC buck convertor driver for the WM831x series
   3  *
   4  * Copyright 2009 Wolfson Microelectronics PLC.
   5  *
   6  * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
   7  *
   8  *  This program is free software; you can redistribute  it and/or modify it
   9  *  under  the terms of  the GNU General  Public License as published by the
  10  *  Free Software Foundation;  either version 2 of the  License, or (at your
  11  *  option) any later version.
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/moduleparam.h>
  16 #include <linux/init.h>
  17 #include <linux/bitops.h>
  18 #include <linux/err.h>
  19 #include <linux/i2c.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/regulator/driver.h>
  22 #include <linux/regulator/machine.h>
  23 #include <linux/gpio.h>
  24 #include <linux/slab.h>
  25
  26 #include <linux/mfd/wm831x/core.h>
  27 #include <linux/mfd/wm831x/regulator.h>
  28 #include <linux/mfd/wm831x/pdata.h>
  29
  30 #define WM831X_BUCKV_MAX_SELECTOR 0x68
  31 #define WM831X_BUCKP_MAX_SELECTOR 0x66
  32
  33 #define WM831X_DCDC_MODE_FAST    0
  34 #define WM831X_DCDC_MODE_NORMAL  1
  35 #define WM831X_DCDC_MODE_IDLE    2
  36 #define WM831X_DCDC_MODE_STANDBY 3
  37
  38 #define WM831X_DCDC_MAX_NAME 6
  39
  40 /* Register offsets in control block */
  41 #define WM831X_DCDC_CONTROL_1     0
  42 #define WM831X_DCDC_CONTROL_2     1
  43 #define WM831X_DCDC_ON_CONFIG     2
  44 #define WM831X_DCDC_SLEEP_CONTROL 3
  45 #define WM831X_DCDC_DVS_CONTROL   4
  46
  47 /*
  48  * Shared
  49  */
  50
  51 struct wm831x_dcdc {
  52         char name[WM831X_DCDC_MAX_NAME];
  53         struct regulator_desc desc;
  54         int base;
  55         struct wm831x *wm831x;
  56         struct regulator_dev *regulator;
  57         int dvs_gpio;
  58         int dvs_gpio_state;
  59         int on_vsel;
  60         int dvs_vsel;
  61 };
  62
  63 static int wm831x_dcdc_is_enabled(struct regulator_dev *rdev)
  64 {
  65         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
  66         struct wm831x *wm831x = dcdc->wm831x;
  67         int mask = 1 << rdev_get_id(rdev);
  68         int reg;
  69
  70         reg = wm831x_reg_read(wm831x, WM831X_DCDC_ENABLE);
  71         if (reg < 0)
  72                 return reg;
  73
  74         if (reg & mask)
  75                 return 1;
  76         else
  77                 return 0;
  78 }
  79
  80 static int wm831x_dcdc_enable(struct regulator_dev *rdev)
  81 {
  82         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
  83         struct wm831x *wm831x = dcdc->wm831x;
  84         int mask = 1 << rdev_get_id(rdev);
  85
  86         return wm831x_set_bits(wm831x, WM831X_DCDC_ENABLE, mask, mask);
  87 }
  88
  89 static int wm831x_dcdc_disable(struct regulator_dev *rdev)
  90 {
  91         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
  92         struct wm831x *wm831x = dcdc->wm831x;
  93         int mask = 1 << rdev_get_id(rdev);
  94
  95         return wm831x_set_bits(wm831x, WM831X_DCDC_ENABLE, mask, 0);
  96 }
  97
  98 static unsigned int wm831x_dcdc_get_mode(struct regulator_dev *rdev)
  99
 100 {
 101         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 102         struct wm831x *wm831x = dcdc->wm831x;
 103         u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
 104         int val;
 105
 106         val = wm831x_reg_read(wm831x, reg);
 107         if (val < 0)
 108                 return val;
 109
 110         val = (val & WM831X_DC1_ON_MODE_MASK) >> WM831X_DC1_ON_MODE_SHIFT;
 111
 112         switch (val) {
 113         case WM831X_DCDC_MODE_FAST:
 114                 return REGULATOR_MODE_FAST;
 115         case WM831X_DCDC_MODE_NORMAL:
 116                 return REGULATOR_MODE_NORMAL;
 117         case WM831X_DCDC_MODE_STANDBY:
 118                 return REGULATOR_MODE_STANDBY;
 119         case WM831X_DCDC_MODE_IDLE:
 120                 return REGULATOR_MODE_IDLE;
 121         default:
 122                 BUG();
 123         }
 124 }
 125
 126 static int wm831x_dcdc_set_mode_int(struct wm831x *wm831x, int reg,
 127                                     unsigned int mode)
 128 {
 129         int val;
 130
 131         switch (mode) {
 132         case REGULATOR_MODE_FAST:
 133                 val = WM831X_DCDC_MODE_FAST;
 134                 break;
 135         case REGULATOR_MODE_NORMAL:
 136                 val = WM831X_DCDC_MODE_NORMAL;
 137                 break;
 138         case REGULATOR_MODE_STANDBY:
 139                 val = WM831X_DCDC_MODE_STANDBY;
 140                 break;
 141         case REGULATOR_MODE_IDLE:
 142                 val = WM831X_DCDC_MODE_IDLE;
 143                 break;
 144         default:
 145                 return -EINVAL;
 146         }
 147
 148         return wm831x_set_bits(wm831x, reg, WM831X_DC1_ON_MODE_MASK,
 149                                val << WM831X_DC1_ON_MODE_SHIFT);
 150 }
 151
 152 static int wm831x_dcdc_set_mode(struct regulator_dev *rdev, unsigned int mode)
 153 {
 154         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 155         struct wm831x *wm831x = dcdc->wm831x;
 156         u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
 157
 158         return wm831x_dcdc_set_mode_int(wm831x, reg, mode);
 159 }
 160
 161 static int wm831x_dcdc_set_suspend_mode(struct regulator_dev *rdev,
 162                                         unsigned int mode)
 163 {
 164         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 165         struct wm831x *wm831x = dcdc->wm831x;
 166         u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
 167
 168         return wm831x_dcdc_set_mode_int(wm831x, reg, mode);
 169 }
 170
 171 static int wm831x_dcdc_get_status(struct regulator_dev *rdev)
 172 {
 173         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 174         struct wm831x *wm831x = dcdc->wm831x;
 175         int ret;
 176
 177         /* First, check for errors */
 178         ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
 179         if (ret < 0)
 180                 return ret;
 181
 182         if (ret & (1 << rdev_get_id(rdev))) {
 183                 dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
 184                         rdev_get_id(rdev) + 1);
 185                 return REGULATOR_STATUS_ERROR;
 186         }
 187
 188         /* DCDC1 and DCDC2 can additionally detect high voltage/current */
 189         if (rdev_get_id(rdev) < 2) {
 190                 if (ret & (WM831X_DC1_OV_STS << rdev_get_id(rdev))) {
 191                         dev_dbg(wm831x->dev, "DCDC%d over voltage\n",
 192                                 rdev_get_id(rdev) + 1);
 193                         return REGULATOR_STATUS_ERROR;
 194                 }
 195
 196                 if (ret & (WM831X_DC1_HC_STS << rdev_get_id(rdev))) {
 197                         dev_dbg(wm831x->dev, "DCDC%d over current\n",
 198                                 rdev_get_id(rdev) + 1);
 199                         return REGULATOR_STATUS_ERROR;
 200                 }
 201         }
 202
 203         /* Is the regulator on? */
 204         ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
 205         if (ret < 0)
 206                 return ret;
 207         if (!(ret & (1 << rdev_get_id(rdev))))
 208                 return REGULATOR_STATUS_OFF;
 209
 210         /* TODO: When we handle hardware control modes so we can report the
 211          * current mode. */
 212         return REGULATOR_STATUS_ON;
 213 }
 214
 215 static irqreturn_t wm831x_dcdc_uv_irq(int irq, void *data)
 216 {
 217         struct wm831x_dcdc *dcdc = data;
 218
 219         regulator_notifier_call_chain(dcdc->regulator,
 220                                       REGULATOR_EVENT_UNDER_VOLTAGE,
 221                                       NULL);
 222
 223         return IRQ_HANDLED;
 224 }
 225
 226 static irqreturn_t wm831x_dcdc_oc_irq(int irq, void *data)
 227 {
 228         struct wm831x_dcdc *dcdc = data;
 229
 230         regulator_notifier_call_chain(dcdc->regulator,
 231                                       REGULATOR_EVENT_OVER_CURRENT,
 232                                       NULL);
 233
 234         return IRQ_HANDLED;
 235 }
 236
 237 /*
 238  * BUCKV specifics
 239  */
 240
 241 static int wm831x_buckv_list_voltage(struct regulator_dev *rdev,
 242                                       unsigned selector)
 243 {
 244         if (selector <= 0x8)
 245                 return 600000;
 246         if (selector <= WM831X_BUCKV_MAX_SELECTOR)
 247                 return 600000 + ((selector - 0x8) * 12500);
 248         return -EINVAL;
 249 }
 250
 251 static int wm831x_buckv_select_min_voltage(struct regulator_dev *rdev,
 252                                            int min_uV, int max_uV)
 253 {
 254         u16 vsel;
 255
 256         if (min_uV < 600000)
 257                 vsel = 0;
 258         else if (min_uV <= 1800000)
 259                 vsel = ((min_uV - 600000) / 12500) + 8;
 260         else
 261                 return -EINVAL;
 262
 263         if (wm831x_buckv_list_voltage(rdev, vsel) > max_uV)
 264                 return -EINVAL;
 265
 266         return vsel;
 267 }
 268
 269 static int wm831x_buckv_select_max_voltage(struct regulator_dev *rdev,
 270                                            int min_uV, int max_uV)
 271 {
 272         u16 vsel;
 273
 274         if (max_uV < 600000 || max_uV > 1800000)
 275                 return -EINVAL;
 276
 277         vsel = ((max_uV - 600000) / 12500) + 8;
 278
 279         if (wm831x_buckv_list_voltage(rdev, vsel) < min_uV ||
 280             wm831x_buckv_list_voltage(rdev, vsel) < max_uV)
 281                 return -EINVAL;
 282
 283         return vsel;
 284 }
 285
 286 static int wm831x_buckv_set_dvs(struct regulator_dev *rdev, int state)
 287 {
 288         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 289
 290         if (state == dcdc->dvs_gpio_state)
 291                 return 0;
 292
 293         dcdc->dvs_gpio_state = state;
 294         gpio_set_value(dcdc->dvs_gpio, state);
 295
 296         /* Should wait for DVS state change to be asserted if we have
 297          * a GPIO for it, for now assume the device is configured
 298          * for the fastest possible transition.
 299          */
 300
 301         return 0;
 302 }
 303
 304 static int wm831x_buckv_set_voltage(struct regulator_dev *rdev,
 305                                     int min_uV, int max_uV)
 306 {
 307         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 308         struct wm831x *wm831x = dcdc->wm831x;
 309         int on_reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
 310         int dvs_reg = dcdc->base + WM831X_DCDC_DVS_CONTROL;
 311         int vsel, ret;
 312
 313         vsel = wm831x_buckv_select_min_voltage(rdev, min_uV, max_uV);
 314         if (vsel < 0)
 315                 return vsel;
 316
 317         /* If this value is already set then do a GPIO update if we can */
 318         if (dcdc->dvs_gpio && dcdc->on_vsel == vsel)
 319                 return wm831x_buckv_set_dvs(rdev, 0);
 320
 321         if (dcdc->dvs_gpio && dcdc->dvs_vsel == vsel)
 322                 return wm831x_buckv_set_dvs(rdev, 1);
 323
 324         /* Always set the ON status to the minimum voltage */
 325         ret = wm831x_set_bits(wm831x, on_reg, WM831X_DC1_ON_VSEL_MASK, vsel);
 326         if (ret < 0)
 327                 return ret;
 328         dcdc->on_vsel = vsel;
 329
 330         if (!dcdc->dvs_gpio)
 331                 return ret;
 332
 333         /* Kick the voltage transition now */
 334         ret = wm831x_buckv_set_dvs(rdev, 0);
 335         if (ret < 0)
 336                 return ret;
 337
 338         /* Set the high voltage as the DVS voltage.  This is optimised
 339          * for CPUfreq usage, most processors will keep the maximum
 340          * voltage constant and lower the minimum with the frequency. */
 341         vsel = wm831x_buckv_select_max_voltage(rdev, min_uV, max_uV);
 342         if (vsel < 0) {
 343                 /* This should never happen - at worst the same vsel
 344                  * should be chosen */
 345                 WARN_ON(vsel < 0);
 346                 return 0;
 347         }
 348
 349         /* Don't bother if it's the same VSEL we're already using */
 350         if (vsel == dcdc->on_vsel)
 351                 return 0;
 352
 353         ret = wm831x_set_bits(wm831x, dvs_reg, WM831X_DC1_DVS_VSEL_MASK, vsel);
 354         if (ret == 0)
 355                 dcdc->dvs_vsel = vsel;
 356         else
 357                 dev_warn(wm831x->dev, "Failed to set DCDC DVS VSEL: %d\n",
 358                          ret);
 359
 360         return 0;
 361 }
 362
 363 static int wm831x_buckv_set_suspend_voltage(struct regulator_dev *rdev,
 364                                             int uV)
 365 {
 366         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 367         struct wm831x *wm831x = dcdc->wm831x;
 368         u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
 369         int vsel;
 370
 371         vsel = wm831x_buckv_select_min_voltage(rdev, uV, uV);
 372         if (vsel < 0)
 373                 return vsel;
 374
 375         return wm831x_set_bits(wm831x, reg, WM831X_DC1_SLP_VSEL_MASK, vsel);
 376 }
 377
 378 static int wm831x_buckv_get_voltage(struct regulator_dev *rdev)
 379 {
 380         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 381
 382         if (dcdc->dvs_gpio && dcdc->dvs_gpio_state)
 383                 return wm831x_buckv_list_voltage(rdev, dcdc->dvs_vsel);
 384         else
 385                 return wm831x_buckv_list_voltage(rdev, dcdc->on_vsel);
 386 }
 387
 388 /* Current limit options */
 389 static u16 wm831x_dcdc_ilim[] = {
 390         125, 250, 375, 500, 625, 750, 875, 1000
 391 };
 392
 393 static int wm831x_buckv_set_current_limit(struct regulator_dev *rdev,
 394                                            int min_uA, int max_uA)
 395 {
 396         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 397         struct wm831x *wm831x = dcdc->wm831x;
 398         u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2;
 399         int i;
 400
 401         for (i = 0; i < ARRAY_SIZE(wm831x_dcdc_ilim); i++) {
 402                 if (max_uA <= wm831x_dcdc_ilim[i])
 403                         break;
 404         }
 405         if (i == ARRAY_SIZE(wm831x_dcdc_ilim))
 406                 return -EINVAL;
 407
 408         return wm831x_set_bits(wm831x, reg, WM831X_DC1_HC_THR_MASK, i);
 409 }
 410
 411 static int wm831x_buckv_get_current_limit(struct regulator_dev *rdev)
 412 {
 413         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 414         struct wm831x *wm831x = dcdc->wm831x;
 415         u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2;
 416         int val;
 417
 418         val = wm831x_reg_read(wm831x, reg);
 419         if (val < 0)
 420                 return val;
 421
 422         return wm831x_dcdc_ilim[val & WM831X_DC1_HC_THR_MASK];
 423 }
 424
 425 static struct regulator_ops wm831x_buckv_ops = {
 426         .set_voltage = wm831x_buckv_set_voltage,
 427         .get_voltage = wm831x_buckv_get_voltage,
 428         .list_voltage = wm831x_buckv_list_voltage,
 429         .set_suspend_voltage = wm831x_buckv_set_suspend_voltage,
 430         .set_current_limit = wm831x_buckv_set_current_limit,
 431         .get_current_limit = wm831x_buckv_get_current_limit,
 432
 433         .is_enabled = wm831x_dcdc_is_enabled,
 434         .enable = wm831x_dcdc_enable,
 435         .disable = wm831x_dcdc_disable,
 436         .get_status = wm831x_dcdc_get_status,
 437         .get_mode = wm831x_dcdc_get_mode,
 438         .set_mode = wm831x_dcdc_set_mode,
 439         .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
 440 };
 441
 442 /*
 443  * Set up DVS control.  We just log errors since we can still run
 444  * (with reduced performance) if we fail.
 445  */
 446 static __devinit void wm831x_buckv_dvs_init(struct wm831x_dcdc *dcdc,
 447                                             struct wm831x_buckv_pdata *pdata)
 448 {
 449         struct wm831x *wm831x = dcdc->wm831x;
 450         int ret;
 451         u16 ctrl;
 452
 453         if (!pdata || !pdata->dvs_gpio)
 454                 return;
 455
 456         switch (pdata->dvs_control_src) {
 457         case 1:
 458                 ctrl = 2 << WM831X_DC1_DVS_SRC_SHIFT;
 459                 break;
 460         case 2:
 461                 ctrl = 3 << WM831X_DC1_DVS_SRC_SHIFT;
 462                 break;
 463         default:
 464                 dev_err(wm831x->dev, "Invalid DVS control source %d for %s\n",
 465                         pdata->dvs_control_src, dcdc->name);
 466                 return;
 467         }
 468
 469         ret = wm831x_set_bits(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL,
 470                               WM831X_DC1_DVS_SRC_MASK, ctrl);
 471         if (ret < 0) {
 472                 dev_err(wm831x->dev, "Failed to set %s DVS source: %d\n",
 473                         dcdc->name, ret);
 474                 return;
 475         }
 476
 477         ret = gpio_request(pdata->dvs_gpio, "DCDC DVS");
 478         if (ret < 0) {
 479                 dev_err(wm831x->dev, "Failed to get %s DVS GPIO: %d\n",
 480                         dcdc->name, ret);
 481                 return;
 482         }
 483
 484         /* gpiolib won't let us read the GPIO status so pick the higher
 485          * of the two existing voltages so we take it as platform data.
 486          */
 487         dcdc->dvs_gpio_state = pdata->dvs_init_state;
 488
 489         ret = gpio_direction_output(pdata->dvs_gpio, dcdc->dvs_gpio_state);
 490         if (ret < 0) {
 491                 dev_err(wm831x->dev, "Failed to enable %s DVS GPIO: %d\n",
 492                         dcdc->name, ret);
 493                 gpio_free(pdata->dvs_gpio);
 494                 return;
 495         }
 496
 497         dcdc->dvs_gpio = pdata->dvs_gpio;
 498 }
 499
 500 static __devinit int wm831x_buckv_probe(struct platform_device *pdev)
 501 {
 502         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 503         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
 504         int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
 505         struct wm831x_dcdc *dcdc;
 506         struct resource *res;
 507         int ret, irq;
 508
 509         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
 510
 511         if (pdata == NULL || pdata->dcdc[id] == NULL)
 512                 return -ENODEV;
 513
 514         dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
 515         if (dcdc == NULL) {
 516                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 517                 return -ENOMEM;
 518         }
 519
 520         dcdc->wm831x = wm831x;
 521
 522         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 523         if (res == NULL) {
 524                 dev_err(&pdev->dev, "No I/O resource\n");
 525                 ret = -EINVAL;
 526                 goto err;
 527         }
 528         dcdc->base = res->start;
 529
 530         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
 531         dcdc->desc.name = dcdc->name;
 532         dcdc->desc.id = id;
 533         dcdc->desc.type = REGULATOR_VOLTAGE;
 534         dcdc->desc.n_voltages = WM831X_BUCKV_MAX_SELECTOR + 1;
 535         dcdc->desc.ops = &wm831x_buckv_ops;
 536         dcdc->desc.owner = THIS_MODULE;
 537
 538         ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG);
 539         if (ret < 0) {
 540                 dev_err(wm831x->dev, "Failed to read ON VSEL: %d\n", ret);
 541                 goto err;
 542         }
 543         dcdc->on_vsel = ret & WM831X_DC1_ON_VSEL_MASK;
 544
 545         ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG);
 546         if (ret < 0) {
 547                 dev_err(wm831x->dev, "Failed to read DVS VSEL: %d\n", ret);
 548                 goto err;
 549         }
 550         dcdc->dvs_vsel = ret & WM831X_DC1_DVS_VSEL_MASK;
 551
 552         if (pdata->dcdc[id])
 553                 wm831x_buckv_dvs_init(dcdc, pdata->dcdc[id]->driver_data);
 554
 555         dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
 556                                              pdata->dcdc[id], dcdc);
 557         if (IS_ERR(dcdc->regulator)) {
 558                 ret = PTR_ERR(dcdc->regulator);
 559                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
 560                         id + 1, ret);
 561                 goto err;
 562         }
 563
 564         irq = platform_get_irq_byname(pdev, "UV");
 565         ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_uv_irq,
 566                                  IRQF_TRIGGER_RISING, dcdc->name,
 567                                  dcdc);
 568         if (ret != 0) {
 569                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
 570                         irq, ret);
 571                 goto err_regulator;
 572         }
 573
 574         irq = platform_get_irq_byname(pdev, "HC");
 575         ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_oc_irq,
 576                                  IRQF_TRIGGER_RISING, dcdc->name,
 577                                  dcdc);
 578         if (ret != 0) {
 579                 dev_err(&pdev->dev, "Failed to request HC IRQ %d: %d\n",
 580                         irq, ret);
 581                 goto err_uv;
 582         }
 583
 584         platform_set_drvdata(pdev, dcdc);
 585
 586         return 0;
 587
 588 err_uv:
 589         wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc);
 590 err_regulator:
 591         regulator_unregister(dcdc->regulator);
 592 err:
 593         if (dcdc->dvs_gpio)
 594                 gpio_free(dcdc->dvs_gpio);
 595         kfree(dcdc);
 596         return ret;
 597 }
 598
 599 static __devexit int wm831x_buckv_remove(struct platform_device *pdev)
 600 {
 601         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
 602         struct wm831x *wm831x = dcdc->wm831x;
 603
 604         platform_set_drvdata(pdev, NULL);
 605
 606         wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "HC"), dcdc);
 607         wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc);
 608         regulator_unregister(dcdc->regulator);
 609         if (dcdc->dvs_gpio)
 610                 gpio_free(dcdc->dvs_gpio);
 611         kfree(dcdc);
 612
 613         return 0;
 614 }
 615
 616 static struct platform_driver wm831x_buckv_driver = {
 617         .probe = wm831x_buckv_probe,
 618         .remove = __devexit_p(wm831x_buckv_remove),
 619         .driver         = {
 620                 .name   = "wm831x-buckv",
 621                 .owner  = THIS_MODULE,
 622         },
 623 };
 624
 625 /*
 626  * BUCKP specifics
 627  */
 628
 629 static int wm831x_buckp_list_voltage(struct regulator_dev *rdev,
 630                                       unsigned selector)
 631 {
 632         if (selector <= WM831X_BUCKP_MAX_SELECTOR)
 633                 return 850000 + (selector * 25000);
 634         else
 635                 return -EINVAL;
 636 }
 637
 638 static int wm831x_buckp_set_voltage_int(struct regulator_dev *rdev, int reg,
 639                                         int min_uV, int max_uV)
 640 {
 641         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 642         struct wm831x *wm831x = dcdc->wm831x;
 643         u16 vsel;
 644
 645         if (min_uV <= 34000000)
 646                 vsel = (min_uV - 850000) / 25000;
 647         else
 648                 return -EINVAL;
 649
 650         if (wm831x_buckp_list_voltage(rdev, vsel) > max_uV)
 651                 return -EINVAL;
 652
 653         return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, vsel);
 654 }
 655
 656 static int wm831x_buckp_set_voltage(struct regulator_dev *rdev,
 657                                     int min_uV, int max_uV)
 658 {
 659         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 660         u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
 661
 662         return wm831x_buckp_set_voltage_int(rdev, reg, min_uV, max_uV);
 663 }
 664
 665 static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev,
 666                                             int uV)
 667 {
 668         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 669         u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
 670
 671         return wm831x_buckp_set_voltage_int(rdev, reg, uV, uV);
 672 }
 673
 674 static int wm831x_buckp_get_voltage(struct regulator_dev *rdev)
 675 {
 676         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 677         struct wm831x *wm831x = dcdc->wm831x;
 678         u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
 679         int val;
 680
 681         val = wm831x_reg_read(wm831x, reg);
 682         if (val < 0)
 683                 return val;
 684
 685         return wm831x_buckp_list_voltage(rdev, val & WM831X_DC3_ON_VSEL_MASK);
 686 }
 687
 688 static struct regulator_ops wm831x_buckp_ops = {
 689         .set_voltage = wm831x_buckp_set_voltage,
 690         .get_voltage = wm831x_buckp_get_voltage,
 691         .list_voltage = wm831x_buckp_list_voltage,
 692         .set_suspend_voltage = wm831x_buckp_set_suspend_voltage,
 693
 694         .is_enabled = wm831x_dcdc_is_enabled,
 695         .enable = wm831x_dcdc_enable,
 696         .disable = wm831x_dcdc_disable,
 697         .get_status = wm831x_dcdc_get_status,
 698         .get_mode = wm831x_dcdc_get_mode,
 699         .set_mode = wm831x_dcdc_set_mode,
 700         .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
 701 };
 702
 703 static __devinit int wm831x_buckp_probe(struct platform_device *pdev)
 704 {
 705         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 706         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
 707         int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
 708         struct wm831x_dcdc *dcdc;
 709         struct resource *res;
 710         int ret, irq;
 711
 712         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
 713
 714         if (pdata == NULL || pdata->dcdc[id] == NULL)
 715                 return -ENODEV;
 716
 717         dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
 718         if (dcdc == NULL) {
 719                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 720                 return -ENOMEM;
 721         }
 722
 723         dcdc->wm831x = wm831x;
 724
 725         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 726         if (res == NULL) {
 727                 dev_err(&pdev->dev, "No I/O resource\n");
 728                 ret = -EINVAL;
 729                 goto err;
 730         }
 731         dcdc->base = res->start;
 732
 733         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
 734         dcdc->desc.name = dcdc->name;
 735         dcdc->desc.id = id;
 736         dcdc->desc.type = REGULATOR_VOLTAGE;
 737         dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1;
 738         dcdc->desc.ops = &wm831x_buckp_ops;
 739         dcdc->desc.owner = THIS_MODULE;
 740
 741         dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
 742                                              pdata->dcdc[id], dcdc);
 743         if (IS_ERR(dcdc->regulator)) {
 744                 ret = PTR_ERR(dcdc->regulator);
 745                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
 746                         id + 1, ret);
 747                 goto err;
 748         }
 749
 750         irq = platform_get_irq_byname(pdev, "UV");
 751         ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_uv_irq,
 752                                  IRQF_TRIGGER_RISING, dcdc->name,
 753                                  dcdc);
 754         if (ret != 0) {
 755                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
 756                         irq, ret);
 757                 goto err_regulator;
 758         }
 759
 760         platform_set_drvdata(pdev, dcdc);
 761
 762         return 0;
 763
 764 err_regulator:
 765         regulator_unregister(dcdc->regulator);
 766 err:
 767         kfree(dcdc);
 768         return ret;
 769 }
 770
 771 static __devexit int wm831x_buckp_remove(struct platform_device *pdev)
 772 {
 773         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
 774         struct wm831x *wm831x = dcdc->wm831x;
 775
 776         platform_set_drvdata(pdev, NULL);
 777
 778         wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc);
 779         regulator_unregister(dcdc->regulator);
 780         kfree(dcdc);
 781
 782         return 0;
 783 }
 784
 785 static struct platform_driver wm831x_buckp_driver = {
 786         .probe = wm831x_buckp_probe,
 787         .remove = __devexit_p(wm831x_buckp_remove),
 788         .driver         = {
 789                 .name   = "wm831x-buckp",
 790                 .owner  = THIS_MODULE,
 791         },
 792 };
 793
 794 /*
 795  * DCDC boost convertors
 796  */
 797
 798 static int wm831x_boostp_get_status(struct regulator_dev *rdev)
 799 {
 800         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 801         struct wm831x *wm831x = dcdc->wm831x;
 802         int ret;
 803
 804         /* First, check for errors */
 805         ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
 806         if (ret < 0)
 807                 return ret;
 808
 809         if (ret & (1 << rdev_get_id(rdev))) {
 810                 dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
 811                         rdev_get_id(rdev) + 1);
 812                 return REGULATOR_STATUS_ERROR;
 813         }
 814
 815         /* Is the regulator on? */
 816         ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
 817         if (ret < 0)
 818                 return ret;
 819         if (ret & (1 << rdev_get_id(rdev)))
 820                 return REGULATOR_STATUS_ON;
 821         else
 822                 return REGULATOR_STATUS_OFF;
 823 }
 824
 825 static struct regulator_ops wm831x_boostp_ops = {
 826         .get_status = wm831x_boostp_get_status,
 827
 828         .is_enabled = wm831x_dcdc_is_enabled,
 829         .enable = wm831x_dcdc_enable,
 830         .disable = wm831x_dcdc_disable,
 831 };
 832
 833 static __devinit int wm831x_boostp_probe(struct platform_device *pdev)
 834 {
 835         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 836         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
 837         int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
 838         struct wm831x_dcdc *dcdc;
 839         struct resource *res;
 840         int ret, irq;
 841
 842         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
 843
 844         if (pdata == NULL || pdata->dcdc[id] == NULL)
 845                 return -ENODEV;
 846
 847         dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
 848         if (dcdc == NULL) {
 849                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 850                 return -ENOMEM;
 851         }
 852
 853         dcdc->wm831x = wm831x;
 854
 855         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 856         if (res == NULL) {
 857                 dev_err(&pdev->dev, "No I/O resource\n");
 858                 ret = -EINVAL;
 859                 goto err;
 860         }
 861         dcdc->base = res->start;
 862
 863         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
 864         dcdc->desc.name = dcdc->name;
 865         dcdc->desc.id = id;
 866         dcdc->desc.type = REGULATOR_VOLTAGE;
 867         dcdc->desc.ops = &wm831x_boostp_ops;
 868         dcdc->desc.owner = THIS_MODULE;
 869
 870         dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
 871                                              pdata->dcdc[id], dcdc);
 872         if (IS_ERR(dcdc->regulator)) {
 873                 ret = PTR_ERR(dcdc->regulator);
 874                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
 875                         id + 1, ret);
 876                 goto err;
 877         }
 878
 879         irq = platform_get_irq_byname(pdev, "UV");
 880         ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_uv_irq,
 881                                  IRQF_TRIGGER_RISING, dcdc->name,
 882                                  dcdc);
 883         if (ret != 0) {
 884                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
 885                         irq, ret);
 886                 goto err_regulator;
 887         }
 888
 889         platform_set_drvdata(pdev, dcdc);
 890
 891         return 0;
 892
 893 err_regulator:
 894         regulator_unregister(dcdc->regulator);
 895 err:
 896         kfree(dcdc);
 897         return ret;
 898 }
 899
 900 static __devexit int wm831x_boostp_remove(struct platform_device *pdev)
 901 {
 902         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
 903         struct wm831x *wm831x = dcdc->wm831x;
 904
 905         platform_set_drvdata(pdev, NULL);
 906
 907         wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc);
 908         regulator_unregister(dcdc->regulator);
 909         kfree(dcdc);
 910
 911         return 0;
 912 }
 913
 914 static struct platform_driver wm831x_boostp_driver = {
 915         .probe = wm831x_boostp_probe,
 916         .remove = __devexit_p(wm831x_boostp_remove),
 917         .driver         = {
 918                 .name   = "wm831x-boostp",
 919                 .owner  = THIS_MODULE,
 920         },
 921 };
 922
 923 /*
 924  * External Power Enable
 925  *
 926  * These aren't actually DCDCs but look like them in hardware so share
 927  * code.
 928  */
 929
 930 #define WM831X_EPE_BASE 6
 931
 932 static struct regulator_ops wm831x_epe_ops = {
 933         .is_enabled = wm831x_dcdc_is_enabled,
 934         .enable = wm831x_dcdc_enable,
 935         .disable = wm831x_dcdc_disable,
 936         .get_status = wm831x_dcdc_get_status,
 937 };
 938
 939 static __devinit int wm831x_epe_probe(struct platform_device *pdev)
 940 {
 941         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 942         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
 943         int id = pdev->id % ARRAY_SIZE(pdata->epe);
 944         struct wm831x_dcdc *dcdc;
 945         int ret;
 946
 947         dev_dbg(&pdev->dev, "Probing EPE%d\n", id + 1);
 948
 949         if (pdata == NULL || pdata->epe[id] == NULL)
 950                 return -ENODEV;
 951
 952         dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
 953         if (dcdc == NULL) {
 954                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 955                 return -ENOMEM;
 956         }
 957
 958         dcdc->wm831x = wm831x;
 959
 960         /* For current parts this is correct; probably need to revisit
 961          * in future.
 962          */
 963         snprintf(dcdc->name, sizeof(dcdc->name), "EPE%d", id + 1);
 964         dcdc->desc.name = dcdc->name;
 965         dcdc->desc.id = id + WM831X_EPE_BASE; /* Offset in DCDC registers */
 966         dcdc->desc.ops = &wm831x_epe_ops;
 967         dcdc->desc.type = REGULATOR_VOLTAGE;
 968         dcdc->desc.owner = THIS_MODULE;
 969
 970         dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
 971                                              pdata->epe[id], dcdc);
 972         if (IS_ERR(dcdc->regulator)) {
 973                 ret = PTR_ERR(dcdc->regulator);
 974                 dev_err(wm831x->dev, "Failed to register EPE%d: %d\n",
 975                         id + 1, ret);
 976                 goto err;
 977         }
 978
 979         platform_set_drvdata(pdev, dcdc);
 980
 981         return 0;
 982
 983 err:
 984         kfree(dcdc);
 985         return ret;
 986 }
 987
 988 static __devexit int wm831x_epe_remove(struct platform_device *pdev)
 989 {
 990         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
 991
 992         platform_set_drvdata(pdev, NULL);
 993
 994         regulator_unregister(dcdc->regulator);
 995         kfree(dcdc);
 996
 997         return 0;
 998 }
 999
1000 static struct platform_driver wm831x_epe_driver = {
1001         .probe = wm831x_epe_probe,
1002         .remove = __devexit_p(wm831x_epe_remove),
1003         .driver         = {
1004                 .name   = "wm831x-epe",
1005                 .owner  = THIS_MODULE,
1006         },
1007 };
1008
1009 static int __init wm831x_dcdc_init(void)
1010 {
1011         int ret;
1012         ret = platform_driver_register(&wm831x_buckv_driver);
1013         if (ret != 0)
1014                 pr_err("Failed to register WM831x BUCKV driver: %d\n", ret);
1015
1016         ret = platform_driver_register(&wm831x_buckp_driver);
1017         if (ret != 0)
1018                 pr_err("Failed to register WM831x BUCKP driver: %d\n", ret);
1019
1020         ret = platform_driver_register(&wm831x_boostp_driver);
1021         if (ret != 0)
1022                 pr_err("Failed to register WM831x BOOST driver: %d\n", ret);
1023
1024         ret = platform_driver_register(&wm831x_epe_driver);
1025         if (ret != 0)
1026                 pr_err("Failed to register WM831x EPE driver: %d\n", ret);
1027
1028         return 0;
1029 }
1030 subsys_initcall(wm831x_dcdc_init);
1031
1032 static void __exit wm831x_dcdc_exit(void)
1033 {
1034         platform_driver_unregister(&wm831x_epe_driver);
1035         platform_driver_unregister(&wm831x_boostp_driver);
1036         platform_driver_unregister(&wm831x_buckp_driver);
1037         platform_driver_unregister(&wm831x_buckv_driver);
1038 }
1039 module_exit(wm831x_dcdc_exit);
1040
1041 /* Module information */
1042 MODULE_AUTHOR("Mark Brown");
1043 MODULE_DESCRIPTION("WM831x DC-DC convertor driver");
1044 MODULE_LICENSE("GPL");
1045 MODULE_ALIAS("platform:wm831x-buckv");
1046 MODULE_ALIAS("platform:wm831x-buckp");