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 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                 return -EINVAL;
 124         }
 125 }
 126
 127 static int wm831x_dcdc_set_mode_int(struct wm831x *wm831x, int reg,
 128                                     unsigned int mode)
 129 {
 130         int val;
 131
 132         switch (mode) {
 133         case REGULATOR_MODE_FAST:
 134                 val = WM831X_DCDC_MODE_FAST;
 135                 break;
 136         case REGULATOR_MODE_NORMAL:
 137                 val = WM831X_DCDC_MODE_NORMAL;
 138                 break;
 139         case REGULATOR_MODE_STANDBY:
 140                 val = WM831X_DCDC_MODE_STANDBY;
 141                 break;
 142         case REGULATOR_MODE_IDLE:
 143                 val = WM831X_DCDC_MODE_IDLE;
 144                 break;
 145         default:
 146                 return -EINVAL;
 147         }
 148
 149         return wm831x_set_bits(wm831x, reg, WM831X_DC1_ON_MODE_MASK,
 150                                val << WM831X_DC1_ON_MODE_SHIFT);
 151 }
 152
 153 static int wm831x_dcdc_set_mode(struct regulator_dev *rdev, unsigned int mode)
 154 {
 155         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 156         struct wm831x *wm831x = dcdc->wm831x;
 157         u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
 158
 159         return wm831x_dcdc_set_mode_int(wm831x, reg, mode);
 160 }
 161
 162 static int wm831x_dcdc_set_suspend_mode(struct regulator_dev *rdev,
 163                                         unsigned int mode)
 164 {
 165         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 166         struct wm831x *wm831x = dcdc->wm831x;
 167         u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
 168
 169         return wm831x_dcdc_set_mode_int(wm831x, reg, mode);
 170 }
 171
 172 static int wm831x_dcdc_get_status(struct regulator_dev *rdev)
 173 {
 174         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 175         struct wm831x *wm831x = dcdc->wm831x;
 176         int ret;
 177
 178         /* First, check for errors */
 179         ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
 180         if (ret < 0)
 181                 return ret;
 182
 183         if (ret & (1 << rdev_get_id(rdev))) {
 184                 dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
 185                         rdev_get_id(rdev) + 1);
 186                 return REGULATOR_STATUS_ERROR;
 187         }
 188
 189         /* DCDC1 and DCDC2 can additionally detect high voltage/current */
 190         if (rdev_get_id(rdev) < 2) {
 191                 if (ret & (WM831X_DC1_OV_STS << rdev_get_id(rdev))) {
 192                         dev_dbg(wm831x->dev, "DCDC%d over voltage\n",
 193                                 rdev_get_id(rdev) + 1);
 194                         return REGULATOR_STATUS_ERROR;
 195                 }
 196
 197                 if (ret & (WM831X_DC1_HC_STS << rdev_get_id(rdev))) {
 198                         dev_dbg(wm831x->dev, "DCDC%d over current\n",
 199                                 rdev_get_id(rdev) + 1);
 200                         return REGULATOR_STATUS_ERROR;
 201                 }
 202         }
 203
 204         /* Is the regulator on? */
 205         ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
 206         if (ret < 0)
 207                 return ret;
 208         if (!(ret & (1 << rdev_get_id(rdev))))
 209                 return REGULATOR_STATUS_OFF;
 210
 211         /* TODO: When we handle hardware control modes so we can report the
 212          * current mode. */
 213         return REGULATOR_STATUS_ON;
 214 }
 215
 216 static irqreturn_t wm831x_dcdc_uv_irq(int irq, void *data)
 217 {
 218         struct wm831x_dcdc *dcdc = data;
 219
 220         regulator_notifier_call_chain(dcdc->regulator,
 221                                       REGULATOR_EVENT_UNDER_VOLTAGE,
 222                                       NULL);
 223
 224         return IRQ_HANDLED;
 225 }
 226
 227 static irqreturn_t wm831x_dcdc_oc_irq(int irq, void *data)
 228 {
 229         struct wm831x_dcdc *dcdc = data;
 230
 231         regulator_notifier_call_chain(dcdc->regulator,
 232                                       REGULATOR_EVENT_OVER_CURRENT,
 233                                       NULL);
 234
 235         return IRQ_HANDLED;
 236 }
 237
 238 /*
 239  * BUCKV specifics
 240  */
 241
 242 static int wm831x_buckv_list_voltage(struct regulator_dev *rdev,
 243                                       unsigned selector)
 244 {
 245         if (selector <= 0x8)
 246                 return 600000;
 247         if (selector <= WM831X_BUCKV_MAX_SELECTOR)
 248                 return 600000 + ((selector - 0x8) * 12500);
 249         return -EINVAL;
 250 }
 251
 252 static int wm831x_buckv_select_min_voltage(struct regulator_dev *rdev,
 253                                            int min_uV, int max_uV)
 254 {
 255         u16 vsel;
 256
 257         if (min_uV < 600000)
 258                 vsel = 0;
 259         else if (min_uV <= 1800000)
 260                 vsel = ((min_uV - 600000) / 12500) + 8;
 261         else
 262                 return -EINVAL;
 263
 264         if (wm831x_buckv_list_voltage(rdev, vsel) > max_uV)
 265                 return -EINVAL;
 266
 267         return vsel;
 268 }
 269
 270 static int wm831x_buckv_select_max_voltage(struct regulator_dev *rdev,
 271                                            int min_uV, int max_uV)
 272 {
 273         u16 vsel;
 274
 275         if (max_uV < 600000 || max_uV > 1800000)
 276                 return -EINVAL;
 277
 278         vsel = ((max_uV - 600000) / 12500) + 8;
 279
 280         if (wm831x_buckv_list_voltage(rdev, vsel) < min_uV ||
 281             wm831x_buckv_list_voltage(rdev, vsel) < max_uV)
 282                 return -EINVAL;
 283
 284         return vsel;
 285 }
 286
 287 static int wm831x_buckv_set_dvs(struct regulator_dev *rdev, int state)
 288 {
 289         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 290
 291         if (state == dcdc->dvs_gpio_state)
 292                 return 0;
 293
 294         dcdc->dvs_gpio_state = state;
 295         gpio_set_value(dcdc->dvs_gpio, state);
 296
 297         /* Should wait for DVS state change to be asserted if we have
 298          * a GPIO for it, for now assume the device is configured
 299          * for the fastest possible transition.
 300          */
 301
 302         return 0;
 303 }
 304
 305 static int wm831x_buckv_set_voltage(struct regulator_dev *rdev,
 306                                     int min_uV, int max_uV, unsigned *selector)
 307 {
 308         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 309         struct wm831x *wm831x = dcdc->wm831x;
 310         int on_reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
 311         int dvs_reg = dcdc->base + WM831X_DCDC_DVS_CONTROL;
 312         int vsel, ret;
 313
 314         vsel = wm831x_buckv_select_min_voltage(rdev, min_uV, max_uV);
 315         if (vsel < 0)
 316                 return vsel;
 317
 318         *selector = vsel;
 319
 320         /* If this value is already set then do a GPIO update if we can */
 321         if (dcdc->dvs_gpio && dcdc->on_vsel == vsel)
 322                 return wm831x_buckv_set_dvs(rdev, 0);
 323
 324         if (dcdc->dvs_gpio && dcdc->dvs_vsel == vsel)
 325                 return wm831x_buckv_set_dvs(rdev, 1);
 326
 327         /* Always set the ON status to the minimum voltage */
 328         ret = wm831x_set_bits(wm831x, on_reg, WM831X_DC1_ON_VSEL_MASK, vsel);
 329         if (ret < 0)
 330                 return ret;
 331         dcdc->on_vsel = vsel;
 332
 333         if (!dcdc->dvs_gpio)
 334                 return ret;
 335
 336         /* Kick the voltage transition now */
 337         ret = wm831x_buckv_set_dvs(rdev, 0);
 338         if (ret < 0)
 339                 return ret;
 340
 341         /* Set the high voltage as the DVS voltage.  This is optimised
 342          * for CPUfreq usage, most processors will keep the maximum
 343          * voltage constant and lower the minimum with the frequency. */
 344         vsel = wm831x_buckv_select_max_voltage(rdev, min_uV, max_uV);
 345         if (vsel < 0) {
 346                 /* This should never happen - at worst the same vsel
 347                  * should be chosen */
 348                 WARN_ON(vsel < 0);
 349                 return 0;
 350         }
 351
 352         /* Don't bother if it's the same VSEL we're already using */
 353         if (vsel == dcdc->on_vsel)
 354                 return 0;
 355
 356         ret = wm831x_set_bits(wm831x, dvs_reg, WM831X_DC1_DVS_VSEL_MASK, vsel);
 357         if (ret == 0)
 358                 dcdc->dvs_vsel = vsel;
 359         else
 360                 dev_warn(wm831x->dev, "Failed to set DCDC DVS VSEL: %d\n",
 361                          ret);
 362
 363         return 0;
 364 }
 365
 366 static int wm831x_buckv_set_suspend_voltage(struct regulator_dev *rdev,
 367                                             int uV)
 368 {
 369         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 370         struct wm831x *wm831x = dcdc->wm831x;
 371         u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
 372         int vsel;
 373
 374         vsel = wm831x_buckv_select_min_voltage(rdev, uV, uV);
 375         if (vsel < 0)
 376                 return vsel;
 377
 378         return wm831x_set_bits(wm831x, reg, WM831X_DC1_SLP_VSEL_MASK, vsel);
 379 }
 380
 381 static int wm831x_buckv_get_voltage_sel(struct regulator_dev *rdev)
 382 {
 383         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 384
 385         if (dcdc->dvs_gpio && dcdc->dvs_gpio_state)
 386                 return dcdc->dvs_vsel;
 387         else
 388                 return dcdc->on_vsel;
 389 }
 390
 391 /* Current limit options */
 392 static u16 wm831x_dcdc_ilim[] = {
 393         125, 250, 375, 500, 625, 750, 875, 1000
 394 };
 395
 396 static int wm831x_buckv_set_current_limit(struct regulator_dev *rdev,
 397                                            int min_uA, int max_uA)
 398 {
 399         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 400         struct wm831x *wm831x = dcdc->wm831x;
 401         u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2;
 402         int i;
 403
 404         for (i = 0; i < ARRAY_SIZE(wm831x_dcdc_ilim); i++) {
 405                 if (max_uA <= wm831x_dcdc_ilim[i])
 406                         break;
 407         }
 408         if (i == ARRAY_SIZE(wm831x_dcdc_ilim))
 409                 return -EINVAL;
 410
 411         return wm831x_set_bits(wm831x, reg, WM831X_DC1_HC_THR_MASK, i);
 412 }
 413
 414 static int wm831x_buckv_get_current_limit(struct regulator_dev *rdev)
 415 {
 416         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 417         struct wm831x *wm831x = dcdc->wm831x;
 418         u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2;
 419         int val;
 420
 421         val = wm831x_reg_read(wm831x, reg);
 422         if (val < 0)
 423                 return val;
 424
 425         return wm831x_dcdc_ilim[val & WM831X_DC1_HC_THR_MASK];
 426 }
 427
 428 static struct regulator_ops wm831x_buckv_ops = {
 429         .set_voltage = wm831x_buckv_set_voltage,
 430         .get_voltage_sel = wm831x_buckv_get_voltage_sel,
 431         .list_voltage = wm831x_buckv_list_voltage,
 432         .set_suspend_voltage = wm831x_buckv_set_suspend_voltage,
 433         .set_current_limit = wm831x_buckv_set_current_limit,
 434         .get_current_limit = wm831x_buckv_get_current_limit,
 435
 436         .is_enabled = wm831x_dcdc_is_enabled,
 437         .enable = wm831x_dcdc_enable,
 438         .disable = wm831x_dcdc_disable,
 439         .get_status = wm831x_dcdc_get_status,
 440         .get_mode = wm831x_dcdc_get_mode,
 441         .set_mode = wm831x_dcdc_set_mode,
 442         .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
 443 };
 444
 445 /*
 446  * Set up DVS control.  We just log errors since we can still run
 447  * (with reduced performance) if we fail.
 448  */
 449 static __devinit void wm831x_buckv_dvs_init(struct wm831x_dcdc *dcdc,
 450                                             struct wm831x_buckv_pdata *pdata)
 451 {
 452         struct wm831x *wm831x = dcdc->wm831x;
 453         int ret;
 454         u16 ctrl;
 455
 456         if (!pdata || !pdata->dvs_gpio)
 457                 return;
 458
 459         ret = gpio_request(pdata->dvs_gpio, "DCDC DVS");
 460         if (ret < 0) {
 461                 dev_err(wm831x->dev, "Failed to get %s DVS GPIO: %d\n",
 462                         dcdc->name, ret);
 463                 return;
 464         }
 465
 466         /* gpiolib won't let us read the GPIO status so pick the higher
 467          * of the two existing voltages so we take it as platform data.
 468          */
 469         dcdc->dvs_gpio_state = pdata->dvs_init_state;
 470
 471         ret = gpio_direction_output(pdata->dvs_gpio, dcdc->dvs_gpio_state);
 472         if (ret < 0) {
 473                 dev_err(wm831x->dev, "Failed to enable %s DVS GPIO: %d\n",
 474                         dcdc->name, ret);
 475                 gpio_free(pdata->dvs_gpio);
 476                 return;
 477         }
 478
 479         dcdc->dvs_gpio = pdata->dvs_gpio;
 480
 481         switch (pdata->dvs_control_src) {
 482         case 1:
 483                 ctrl = 2 << WM831X_DC1_DVS_SRC_SHIFT;
 484                 break;
 485         case 2:
 486                 ctrl = 3 << WM831X_DC1_DVS_SRC_SHIFT;
 487                 break;
 488         default:
 489                 dev_err(wm831x->dev, "Invalid DVS control source %d for %s\n",
 490                         pdata->dvs_control_src, dcdc->name);
 491                 return;
 492         }
 493
 494         ret = wm831x_set_bits(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL,
 495                               WM831X_DC1_DVS_SRC_MASK, ctrl);
 496         if (ret < 0) {
 497                 dev_err(wm831x->dev, "Failed to set %s DVS source: %d\n",
 498                         dcdc->name, ret);
 499         }
 500 }
 501
 502 static __devinit int wm831x_buckv_probe(struct platform_device *pdev)
 503 {
 504         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 505         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
 506         int id;
 507         struct wm831x_dcdc *dcdc;
 508         struct resource *res;
 509         int ret, irq;
 510
 511         if (pdata && pdata->wm831x_num)
 512                 id = (pdata->wm831x_num * 10) + 1;
 513         else
 514                 id = 0;
 515         id = pdev->id - id;
 516
 517         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
 518
 519         if (pdata == NULL || pdata->dcdc[id] == NULL)
 520                 return -ENODEV;
 521
 522         dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
 523         if (dcdc == NULL) {
 524                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 525                 return -ENOMEM;
 526         }
 527
 528         dcdc->wm831x = wm831x;
 529
 530         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 531         if (res == NULL) {
 532                 dev_err(&pdev->dev, "No I/O resource\n");
 533                 ret = -EINVAL;
 534                 goto err;
 535         }
 536         dcdc->base = res->start;
 537
 538         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
 539         dcdc->desc.name = dcdc->name;
 540         dcdc->desc.id = id;
 541         dcdc->desc.type = REGULATOR_VOLTAGE;
 542         dcdc->desc.n_voltages = WM831X_BUCKV_MAX_SELECTOR + 1;
 543         dcdc->desc.ops = &wm831x_buckv_ops;
 544         dcdc->desc.owner = THIS_MODULE;
 545
 546         ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG);
 547         if (ret < 0) {
 548                 dev_err(wm831x->dev, "Failed to read ON VSEL: %d\n", ret);
 549                 goto err;
 550         }
 551         dcdc->on_vsel = ret & WM831X_DC1_ON_VSEL_MASK;
 552
 553         ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL);
 554         if (ret < 0) {
 555                 dev_err(wm831x->dev, "Failed to read DVS VSEL: %d\n", ret);
 556                 goto err;
 557         }
 558         dcdc->dvs_vsel = ret & WM831X_DC1_DVS_VSEL_MASK;
 559
 560         if (pdata->dcdc[id])
 561                 wm831x_buckv_dvs_init(dcdc, pdata->dcdc[id]->driver_data);
 562
 563         dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
 564                                              pdata->dcdc[id], dcdc);
 565         if (IS_ERR(dcdc->regulator)) {
 566                 ret = PTR_ERR(dcdc->regulator);
 567                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
 568                         id + 1, ret);
 569                 goto err;
 570         }
 571
 572         irq = platform_get_irq_byname(pdev, "UV");
 573         ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
 574                                    IRQF_TRIGGER_RISING, dcdc->name, dcdc);
 575         if (ret != 0) {
 576                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
 577                         irq, ret);
 578                 goto err_regulator;
 579         }
 580
 581         irq = platform_get_irq_byname(pdev, "HC");
 582         ret = request_threaded_irq(irq, NULL, wm831x_dcdc_oc_irq,
 583                                    IRQF_TRIGGER_RISING, dcdc->name, dcdc);
 584         if (ret != 0) {
 585                 dev_err(&pdev->dev, "Failed to request HC IRQ %d: %d\n",
 586                         irq, ret);
 587                 goto err_uv;
 588         }
 589
 590         platform_set_drvdata(pdev, dcdc);
 591
 592         return 0;
 593
 594 err_uv:
 595         free_irq(platform_get_irq_byname(pdev, "UV"), dcdc);
 596 err_regulator:
 597         regulator_unregister(dcdc->regulator);
 598 err:
 599         if (dcdc->dvs_gpio)
 600                 gpio_free(dcdc->dvs_gpio);
 601         kfree(dcdc);
 602         return ret;
 603 }
 604
 605 static __devexit int wm831x_buckv_remove(struct platform_device *pdev)
 606 {
 607         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
 608
 609         platform_set_drvdata(pdev, NULL);
 610
 611         free_irq(platform_get_irq_byname(pdev, "HC"), dcdc);
 612         free_irq(platform_get_irq_byname(pdev, "UV"), dcdc);
 613         regulator_unregister(dcdc->regulator);
 614         if (dcdc->dvs_gpio)
 615                 gpio_free(dcdc->dvs_gpio);
 616         kfree(dcdc);
 617
 618         return 0;
 619 }
 620
 621 static struct platform_driver wm831x_buckv_driver = {
 622         .probe = wm831x_buckv_probe,
 623         .remove = __devexit_p(wm831x_buckv_remove),
 624         .driver         = {
 625                 .name   = "wm831x-buckv",
 626                 .owner  = THIS_MODULE,
 627         },
 628 };
 629
 630 /*
 631  * BUCKP specifics
 632  */
 633
 634 static int wm831x_buckp_list_voltage(struct regulator_dev *rdev,
 635                                       unsigned selector)
 636 {
 637         if (selector <= WM831X_BUCKP_MAX_SELECTOR)
 638                 return 850000 + (selector * 25000);
 639         else
 640                 return -EINVAL;
 641 }
 642
 643 static int wm831x_buckp_set_voltage_int(struct regulator_dev *rdev, int reg,
 644                                         int min_uV, int max_uV, int *selector)
 645 {
 646         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 647         struct wm831x *wm831x = dcdc->wm831x;
 648         u16 vsel;
 649
 650         if (min_uV <= 34000000)
 651                 vsel = (min_uV - 850000) / 25000;
 652         else
 653                 return -EINVAL;
 654
 655         if (wm831x_buckp_list_voltage(rdev, vsel) > max_uV)
 656                 return -EINVAL;
 657
 658         *selector = vsel;
 659
 660         return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, vsel);
 661 }
 662
 663 static int wm831x_buckp_set_voltage(struct regulator_dev *rdev,
 664                                     int min_uV, int max_uV,
 665                                     unsigned *selector)
 666 {
 667         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 668         u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
 669
 670         return wm831x_buckp_set_voltage_int(rdev, reg, min_uV, max_uV,
 671                                             selector);
 672 }
 673
 674 static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev,
 675                                             int uV)
 676 {
 677         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 678         u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
 679         unsigned selector;
 680
 681         return wm831x_buckp_set_voltage_int(rdev, reg, uV, uV, &selector);
 682 }
 683
 684 static int wm831x_buckp_get_voltage_sel(struct regulator_dev *rdev)
 685 {
 686         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 687         struct wm831x *wm831x = dcdc->wm831x;
 688         u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
 689         int val;
 690
 691         val = wm831x_reg_read(wm831x, reg);
 692         if (val < 0)
 693                 return val;
 694
 695         return val & WM831X_DC3_ON_VSEL_MASK;
 696 }
 697
 698 static struct regulator_ops wm831x_buckp_ops = {
 699         .set_voltage = wm831x_buckp_set_voltage,
 700         .get_voltage_sel = wm831x_buckp_get_voltage_sel,
 701         .list_voltage = wm831x_buckp_list_voltage,
 702         .set_suspend_voltage = wm831x_buckp_set_suspend_voltage,
 703
 704         .is_enabled = wm831x_dcdc_is_enabled,
 705         .enable = wm831x_dcdc_enable,
 706         .disable = wm831x_dcdc_disable,
 707         .get_status = wm831x_dcdc_get_status,
 708         .get_mode = wm831x_dcdc_get_mode,
 709         .set_mode = wm831x_dcdc_set_mode,
 710         .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
 711 };
 712
 713 static __devinit int wm831x_buckp_probe(struct platform_device *pdev)
 714 {
 715         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 716         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
 717         int id;
 718         struct wm831x_dcdc *dcdc;
 719         struct resource *res;
 720         int ret, irq;
 721
 722         if (pdata && pdata->wm831x_num)
 723                 id = (pdata->wm831x_num * 10) + 1;
 724         else
 725                 id = 0;
 726         id = pdev->id - id;
 727
 728         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
 729
 730         if (pdata == NULL || pdata->dcdc[id] == NULL)
 731                 return -ENODEV;
 732
 733         dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
 734         if (dcdc == NULL) {
 735                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 736                 return -ENOMEM;
 737         }
 738
 739         dcdc->wm831x = wm831x;
 740
 741         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 742         if (res == NULL) {
 743                 dev_err(&pdev->dev, "No I/O resource\n");
 744                 ret = -EINVAL;
 745                 goto err;
 746         }
 747         dcdc->base = res->start;
 748
 749         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
 750         dcdc->desc.name = dcdc->name;
 751         dcdc->desc.id = id;
 752         dcdc->desc.type = REGULATOR_VOLTAGE;
 753         dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1;
 754         dcdc->desc.ops = &wm831x_buckp_ops;
 755         dcdc->desc.owner = THIS_MODULE;
 756
 757         dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
 758                                              pdata->dcdc[id], dcdc);
 759         if (IS_ERR(dcdc->regulator)) {
 760                 ret = PTR_ERR(dcdc->regulator);
 761                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
 762                         id + 1, ret);
 763                 goto err;
 764         }
 765
 766         irq = platform_get_irq_byname(pdev, "UV");
 767         ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
 768                                    IRQF_TRIGGER_RISING, dcdc->name, dcdc);
 769         if (ret != 0) {
 770                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
 771                         irq, ret);
 772                 goto err_regulator;
 773         }
 774
 775         platform_set_drvdata(pdev, dcdc);
 776
 777         return 0;
 778
 779 err_regulator:
 780         regulator_unregister(dcdc->regulator);
 781 err:
 782         kfree(dcdc);
 783         return ret;
 784 }
 785
 786 static __devexit int wm831x_buckp_remove(struct platform_device *pdev)
 787 {
 788         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
 789
 790         platform_set_drvdata(pdev, NULL);
 791
 792         free_irq(platform_get_irq_byname(pdev, "UV"), dcdc);
 793         regulator_unregister(dcdc->regulator);
 794         kfree(dcdc);
 795
 796         return 0;
 797 }
 798
 799 static struct platform_driver wm831x_buckp_driver = {
 800         .probe = wm831x_buckp_probe,
 801         .remove = __devexit_p(wm831x_buckp_remove),
 802         .driver         = {
 803                 .name   = "wm831x-buckp",
 804                 .owner  = THIS_MODULE,
 805         },
 806 };
 807
 808 /*
 809  * DCDC boost convertors
 810  */
 811
 812 static int wm831x_boostp_get_status(struct regulator_dev *rdev)
 813 {
 814         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 815         struct wm831x *wm831x = dcdc->wm831x;
 816         int ret;
 817
 818         /* First, check for errors */
 819         ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
 820         if (ret < 0)
 821                 return ret;
 822
 823         if (ret & (1 << rdev_get_id(rdev))) {
 824                 dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
 825                         rdev_get_id(rdev) + 1);
 826                 return REGULATOR_STATUS_ERROR;
 827         }
 828
 829         /* Is the regulator on? */
 830         ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
 831         if (ret < 0)
 832                 return ret;
 833         if (ret & (1 << rdev_get_id(rdev)))
 834                 return REGULATOR_STATUS_ON;
 835         else
 836                 return REGULATOR_STATUS_OFF;
 837 }
 838
 839 static struct regulator_ops wm831x_boostp_ops = {
 840         .get_status = wm831x_boostp_get_status,
 841
 842         .is_enabled = wm831x_dcdc_is_enabled,
 843         .enable = wm831x_dcdc_enable,
 844         .disable = wm831x_dcdc_disable,
 845 };
 846
 847 static __devinit int wm831x_boostp_probe(struct platform_device *pdev)
 848 {
 849         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 850         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
 851         int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
 852         struct wm831x_dcdc *dcdc;
 853         struct resource *res;
 854         int ret, irq;
 855
 856         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
 857
 858         if (pdata == NULL || pdata->dcdc[id] == NULL)
 859                 return -ENODEV;
 860
 861         dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
 862         if (dcdc == NULL) {
 863                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 864                 return -ENOMEM;
 865         }
 866
 867         dcdc->wm831x = wm831x;
 868
 869         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 870         if (res == NULL) {
 871                 dev_err(&pdev->dev, "No I/O resource\n");
 872                 ret = -EINVAL;
 873                 goto err;
 874         }
 875         dcdc->base = res->start;
 876
 877         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
 878         dcdc->desc.name = dcdc->name;
 879         dcdc->desc.id = id;
 880         dcdc->desc.type = REGULATOR_VOLTAGE;
 881         dcdc->desc.ops = &wm831x_boostp_ops;
 882         dcdc->desc.owner = THIS_MODULE;
 883
 884         dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
 885                                              pdata->dcdc[id], dcdc);
 886         if (IS_ERR(dcdc->regulator)) {
 887                 ret = PTR_ERR(dcdc->regulator);
 888                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
 889                         id + 1, ret);
 890                 goto err;
 891         }
 892
 893         irq = platform_get_irq_byname(pdev, "UV");
 894         ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
 895                                    IRQF_TRIGGER_RISING, dcdc->name,
 896                                    dcdc);
 897         if (ret != 0) {
 898                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
 899                         irq, ret);
 900                 goto err_regulator;
 901         }
 902
 903         platform_set_drvdata(pdev, dcdc);
 904
 905         return 0;
 906
 907 err_regulator:
 908         regulator_unregister(dcdc->regulator);
 909 err:
 910         kfree(dcdc);
 911         return ret;
 912 }
 913
 914 static __devexit int wm831x_boostp_remove(struct platform_device *pdev)
 915 {
 916         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
 917
 918         platform_set_drvdata(pdev, NULL);
 919
 920         free_irq(platform_get_irq_byname(pdev, "UV"), dcdc);
 921         regulator_unregister(dcdc->regulator);
 922         kfree(dcdc);
 923
 924         return 0;
 925 }
 926
 927 static struct platform_driver wm831x_boostp_driver = {
 928         .probe = wm831x_boostp_probe,
 929         .remove = __devexit_p(wm831x_boostp_remove),
 930         .driver         = {
 931                 .name   = "wm831x-boostp",
 932                 .owner  = THIS_MODULE,
 933         },
 934 };
 935
 936 /*
 937  * External Power Enable
 938  *
 939  * These aren't actually DCDCs but look like them in hardware so share
 940  * code.
 941  */
 942
 943 #define WM831X_EPE_BASE 6
 944
 945 static struct regulator_ops wm831x_epe_ops = {
 946         .is_enabled = wm831x_dcdc_is_enabled,
 947         .enable = wm831x_dcdc_enable,
 948         .disable = wm831x_dcdc_disable,
 949         .get_status = wm831x_dcdc_get_status,
 950 };
 951
 952 static __devinit int wm831x_epe_probe(struct platform_device *pdev)
 953 {
 954         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 955         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
 956         int id = pdev->id % ARRAY_SIZE(pdata->epe);
 957         struct wm831x_dcdc *dcdc;
 958         int ret;
 959
 960         dev_dbg(&pdev->dev, "Probing EPE%d\n", id + 1);
 961
 962         if (pdata == NULL || pdata->epe[id] == NULL)
 963                 return -ENODEV;
 964
 965         dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
 966         if (dcdc == NULL) {
 967                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 968                 return -ENOMEM;
 969         }
 970
 971         dcdc->wm831x = wm831x;
 972
 973         /* For current parts this is correct; probably need to revisit
 974          * in future.
 975          */
 976         snprintf(dcdc->name, sizeof(dcdc->name), "EPE%d", id + 1);
 977         dcdc->desc.name = dcdc->name;
 978         dcdc->desc.id = id + WM831X_EPE_BASE; /* Offset in DCDC registers */
 979         dcdc->desc.ops = &wm831x_epe_ops;
 980         dcdc->desc.type = REGULATOR_VOLTAGE;
 981         dcdc->desc.owner = THIS_MODULE;
 982
 983         dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
 984                                              pdata->epe[id], dcdc);
 985         if (IS_ERR(dcdc->regulator)) {
 986                 ret = PTR_ERR(dcdc->regulator);
 987                 dev_err(wm831x->dev, "Failed to register EPE%d: %d\n",
 988                         id + 1, ret);
 989                 goto err;
 990         }
 991
 992         platform_set_drvdata(pdev, dcdc);
 993
 994         return 0;
 995
 996 err:
 997         kfree(dcdc);
 998         return ret;
 999 }
1000
1001 static __devexit int wm831x_epe_remove(struct platform_device *pdev)
1002 {
1003         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
1004
1005         platform_set_drvdata(pdev, NULL);
1006
1007         regulator_unregister(dcdc->regulator);
1008         kfree(dcdc);
1009
1010         return 0;
1011 }
1012
1013 static struct platform_driver wm831x_epe_driver = {
1014         .probe = wm831x_epe_probe,
1015         .remove = __devexit_p(wm831x_epe_remove),
1016         .driver         = {
1017                 .name   = "wm831x-epe",
1018                 .owner  = THIS_MODULE,
1019         },
1020 };
1021
1022 static int __init wm831x_dcdc_init(void)
1023 {
1024         int ret;
1025         ret = platform_driver_register(&wm831x_buckv_driver);
1026         if (ret != 0)
1027                 pr_err("Failed to register WM831x BUCKV driver: %d\n", ret);
1028
1029         ret = platform_driver_register(&wm831x_buckp_driver);
1030         if (ret != 0)
1031                 pr_err("Failed to register WM831x BUCKP driver: %d\n", ret);
1032
1033         ret = platform_driver_register(&wm831x_boostp_driver);
1034         if (ret != 0)
1035                 pr_err("Failed to register WM831x BOOST driver: %d\n", ret);
1036
1037         ret = platform_driver_register(&wm831x_epe_driver);
1038         if (ret != 0)
1039                 pr_err("Failed to register WM831x EPE driver: %d\n", ret);
1040
1041         return 0;
1042 }
1043 subsys_initcall(wm831x_dcdc_init);
1044
1045 static void __exit wm831x_dcdc_exit(void)
1046 {
1047         platform_driver_unregister(&wm831x_epe_driver);
1048         platform_driver_unregister(&wm831x_boostp_driver);
1049         platform_driver_unregister(&wm831x_buckp_driver);
1050         platform_driver_unregister(&wm831x_buckv_driver);
1051 }
1052 module_exit(wm831x_dcdc_exit);
1053
1054 /* Module information */
1055 MODULE_AUTHOR("Mark Brown");
1056 MODULE_DESCRIPTION("WM831x DC-DC convertor driver");
1057 MODULE_LICENSE("GPL");
1058 MODULE_ALIAS("platform:wm831x-buckv");
1059 MODULE_ALIAS("platform:wm831x-buckp");
1060 MODULE_ALIAS("platform:wm831x-epe");