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_set_dvs(struct regulator_dev *rdev, int state)
 271 {
 272         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 273
 274         if (state == dcdc->dvs_gpio_state)
 275                 return 0;
 276
 277         dcdc->dvs_gpio_state = state;
 278         gpio_set_value(dcdc->dvs_gpio, state);
 279
 280         /* Should wait for DVS state change to be asserted if we have
 281          * a GPIO for it, for now assume the device is configured
 282          * for the fastest possible transition.
 283          */
 284
 285         return 0;
 286 }
 287
 288 static int wm831x_buckv_set_voltage(struct regulator_dev *rdev,
 289                                     int min_uV, int max_uV, unsigned *selector)
 290 {
 291         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 292         struct wm831x *wm831x = dcdc->wm831x;
 293         int on_reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
 294         int dvs_reg = dcdc->base + WM831X_DCDC_DVS_CONTROL;
 295         int vsel, ret;
 296
 297         vsel = wm831x_buckv_select_min_voltage(rdev, min_uV, max_uV);
 298         if (vsel < 0)
 299                 return vsel;
 300
 301         *selector = vsel;
 302
 303         /* If this value is already set then do a GPIO update if we can */
 304         if (dcdc->dvs_gpio && dcdc->on_vsel == vsel)
 305                 return wm831x_buckv_set_dvs(rdev, 0);
 306
 307         if (dcdc->dvs_gpio && dcdc->dvs_vsel == vsel)
 308                 return wm831x_buckv_set_dvs(rdev, 1);
 309
 310         /* Always set the ON status to the minimum voltage */
 311         ret = wm831x_set_bits(wm831x, on_reg, WM831X_DC1_ON_VSEL_MASK, vsel);
 312         if (ret < 0)
 313                 return ret;
 314         dcdc->on_vsel = vsel;
 315
 316         if (!dcdc->dvs_gpio)
 317                 return ret;
 318
 319         /* Kick the voltage transition now */
 320         ret = wm831x_buckv_set_dvs(rdev, 0);
 321         if (ret < 0)
 322                 return ret;
 323
 324         /*
 325          * If this VSEL is higher than the last one we've seen then
 326          * remember it as the DVS VSEL.  This is optimised for CPUfreq
 327          * usage where we want to get to the highest voltage very
 328          * quickly.
 329          */
 330         if (vsel > dcdc->dvs_vsel) {
 331                 ret = wm831x_set_bits(wm831x, dvs_reg,
 332                                       WM831X_DC1_DVS_VSEL_MASK,
 333                                       vsel);
 334                 if (ret == 0)
 335                         dcdc->dvs_vsel = vsel;
 336                 else
 337                         dev_warn(wm831x->dev,
 338                                  "Failed to set DCDC DVS VSEL: %d\n", ret);
 339         }
 340
 341         return 0;
 342 }
 343
 344 static int wm831x_buckv_set_suspend_voltage(struct regulator_dev *rdev,
 345                                             int uV)
 346 {
 347         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 348         struct wm831x *wm831x = dcdc->wm831x;
 349         u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
 350         int vsel;
 351
 352         vsel = wm831x_buckv_select_min_voltage(rdev, uV, uV);
 353         if (vsel < 0)
 354                 return vsel;
 355
 356         return wm831x_set_bits(wm831x, reg, WM831X_DC1_SLP_VSEL_MASK, vsel);
 357 }
 358
 359 static int wm831x_buckv_get_voltage_sel(struct regulator_dev *rdev)
 360 {
 361         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 362
 363         if (dcdc->dvs_gpio && dcdc->dvs_gpio_state)
 364                 return dcdc->dvs_vsel;
 365         else
 366                 return dcdc->on_vsel;
 367 }
 368
 369 /* Current limit options */
 370 static u16 wm831x_dcdc_ilim[] = {
 371         125, 250, 375, 500, 625, 750, 875, 1000
 372 };
 373
 374 static int wm831x_buckv_set_current_limit(struct regulator_dev *rdev,
 375                                            int min_uA, int max_uA)
 376 {
 377         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 378         struct wm831x *wm831x = dcdc->wm831x;
 379         u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2;
 380         int i;
 381
 382         for (i = 0; i < ARRAY_SIZE(wm831x_dcdc_ilim); i++) {
 383                 if (max_uA <= wm831x_dcdc_ilim[i])
 384                         break;
 385         }
 386         if (i == ARRAY_SIZE(wm831x_dcdc_ilim))
 387                 return -EINVAL;
 388
 389         return wm831x_set_bits(wm831x, reg, WM831X_DC1_HC_THR_MASK, i);
 390 }
 391
 392 static int wm831x_buckv_get_current_limit(struct regulator_dev *rdev)
 393 {
 394         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 395         struct wm831x *wm831x = dcdc->wm831x;
 396         u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2;
 397         int val;
 398
 399         val = wm831x_reg_read(wm831x, reg);
 400         if (val < 0)
 401                 return val;
 402
 403         return wm831x_dcdc_ilim[val & WM831X_DC1_HC_THR_MASK];
 404 }
 405
 406 static struct regulator_ops wm831x_buckv_ops = {
 407         .set_voltage = wm831x_buckv_set_voltage,
 408         .get_voltage_sel = wm831x_buckv_get_voltage_sel,
 409         .list_voltage = wm831x_buckv_list_voltage,
 410         .set_suspend_voltage = wm831x_buckv_set_suspend_voltage,
 411         .set_current_limit = wm831x_buckv_set_current_limit,
 412         .get_current_limit = wm831x_buckv_get_current_limit,
 413
 414         .is_enabled = wm831x_dcdc_is_enabled,
 415         .enable = wm831x_dcdc_enable,
 416         .disable = wm831x_dcdc_disable,
 417         .get_status = wm831x_dcdc_get_status,
 418         .get_mode = wm831x_dcdc_get_mode,
 419         .set_mode = wm831x_dcdc_set_mode,
 420         .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
 421 };
 422
 423 /*
 424  * Set up DVS control.  We just log errors since we can still run
 425  * (with reduced performance) if we fail.
 426  */
 427 static __devinit void wm831x_buckv_dvs_init(struct wm831x_dcdc *dcdc,
 428                                             struct wm831x_buckv_pdata *pdata)
 429 {
 430         struct wm831x *wm831x = dcdc->wm831x;
 431         int ret;
 432         u16 ctrl;
 433
 434         if (!pdata || !pdata->dvs_gpio)
 435                 return;
 436
 437         ret = gpio_request(pdata->dvs_gpio, "DCDC DVS");
 438         if (ret < 0) {
 439                 dev_err(wm831x->dev, "Failed to get %s DVS GPIO: %d\n",
 440                         dcdc->name, ret);
 441                 return;
 442         }
 443
 444         /* gpiolib won't let us read the GPIO status so pick the higher
 445          * of the two existing voltages so we take it as platform data.
 446          */
 447         dcdc->dvs_gpio_state = pdata->dvs_init_state;
 448
 449         ret = gpio_direction_output(pdata->dvs_gpio, dcdc->dvs_gpio_state);
 450         if (ret < 0) {
 451                 dev_err(wm831x->dev, "Failed to enable %s DVS GPIO: %d\n",
 452                         dcdc->name, ret);
 453                 gpio_free(pdata->dvs_gpio);
 454                 return;
 455         }
 456
 457         dcdc->dvs_gpio = pdata->dvs_gpio;
 458
 459         switch (pdata->dvs_control_src) {
 460         case 1:
 461                 ctrl = 2 << WM831X_DC1_DVS_SRC_SHIFT;
 462                 break;
 463         case 2:
 464                 ctrl = 3 << WM831X_DC1_DVS_SRC_SHIFT;
 465                 break;
 466         default:
 467                 dev_err(wm831x->dev, "Invalid DVS control source %d for %s\n",
 468                         pdata->dvs_control_src, dcdc->name);
 469                 return;
 470         }
 471
 472         /* If DVS_VSEL is set to the minimum value then raise it to ON_VSEL
 473          * to make bootstrapping a bit smoother.
 474          */
 475         if (!dcdc->dvs_vsel) {
 476                 ret = wm831x_set_bits(wm831x,
 477                                       dcdc->base + WM831X_DCDC_DVS_CONTROL,
 478                                       WM831X_DC1_DVS_VSEL_MASK, dcdc->on_vsel);
 479                 if (ret == 0)
 480                         dcdc->dvs_vsel = dcdc->on_vsel;
 481                 else
 482                         dev_warn(wm831x->dev, "Failed to set DVS_VSEL: %d\n",
 483                                  ret);
 484         }
 485
 486         ret = wm831x_set_bits(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL,
 487                               WM831X_DC1_DVS_SRC_MASK, ctrl);
 488         if (ret < 0) {
 489                 dev_err(wm831x->dev, "Failed to set %s DVS source: %d\n",
 490                         dcdc->name, ret);
 491         }
 492 }
 493
 494 static __devinit int wm831x_buckv_probe(struct platform_device *pdev)
 495 {
 496         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 497         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
 498         int id;
 499         struct wm831x_dcdc *dcdc;
 500         struct resource *res;
 501         int ret, irq;
 502
 503         if (pdata && pdata->wm831x_num)
 504                 id = (pdata->wm831x_num * 10) + 1;
 505         else
 506                 id = 0;
 507         id = pdev->id - id;
 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_DVS_CONTROL);
 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 = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
 566                                    IRQF_TRIGGER_RISING, dcdc->name, dcdc);
 567         if (ret != 0) {
 568                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
 569                         irq, ret);
 570                 goto err_regulator;
 571         }
 572
 573         irq = platform_get_irq_byname(pdev, "HC");
 574         ret = request_threaded_irq(irq, NULL, wm831x_dcdc_oc_irq,
 575                                    IRQF_TRIGGER_RISING, dcdc->name, dcdc);
 576         if (ret != 0) {
 577                 dev_err(&pdev->dev, "Failed to request HC IRQ %d: %d\n",
 578                         irq, ret);
 579                 goto err_uv;
 580         }
 581
 582         platform_set_drvdata(pdev, dcdc);
 583
 584         return 0;
 585
 586 err_uv:
 587         free_irq(platform_get_irq_byname(pdev, "UV"), dcdc);
 588 err_regulator:
 589         regulator_unregister(dcdc->regulator);
 590 err:
 591         if (dcdc->dvs_gpio)
 592                 gpio_free(dcdc->dvs_gpio);
 593         kfree(dcdc);
 594         return ret;
 595 }
 596
 597 static __devexit int wm831x_buckv_remove(struct platform_device *pdev)
 598 {
 599         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
 600
 601         platform_set_drvdata(pdev, NULL);
 602
 603         free_irq(platform_get_irq_byname(pdev, "HC"), dcdc);
 604         free_irq(platform_get_irq_byname(pdev, "UV"), dcdc);
 605         regulator_unregister(dcdc->regulator);
 606         if (dcdc->dvs_gpio)
 607                 gpio_free(dcdc->dvs_gpio);
 608         kfree(dcdc);
 609
 610         return 0;
 611 }
 612
 613 static struct platform_driver wm831x_buckv_driver = {
 614         .probe = wm831x_buckv_probe,
 615         .remove = __devexit_p(wm831x_buckv_remove),
 616         .driver         = {
 617                 .name   = "wm831x-buckv",
 618                 .owner  = THIS_MODULE,
 619         },
 620 };
 621
 622 /*
 623  * BUCKP specifics
 624  */
 625
 626 static int wm831x_buckp_list_voltage(struct regulator_dev *rdev,
 627                                       unsigned selector)
 628 {
 629         if (selector <= WM831X_BUCKP_MAX_SELECTOR)
 630                 return 850000 + (selector * 25000);
 631         else
 632                 return -EINVAL;
 633 }
 634
 635 static int wm831x_buckp_set_voltage_int(struct regulator_dev *rdev, int reg,
 636                                         int min_uV, int max_uV, int *selector)
 637 {
 638         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 639         struct wm831x *wm831x = dcdc->wm831x;
 640         u16 vsel;
 641
 642         if (min_uV <= 34000000)
 643                 vsel = (min_uV - 850000) / 25000;
 644         else
 645                 return -EINVAL;
 646
 647         if (wm831x_buckp_list_voltage(rdev, vsel) > max_uV)
 648                 return -EINVAL;
 649
 650         *selector = vsel;
 651
 652         return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, vsel);
 653 }
 654
 655 static int wm831x_buckp_set_voltage(struct regulator_dev *rdev,
 656                                     int min_uV, int max_uV,
 657                                     unsigned *selector)
 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                                             selector);
 664 }
 665
 666 static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev,
 667                                             int uV)
 668 {
 669         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 670         u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
 671         unsigned selector;
 672
 673         return wm831x_buckp_set_voltage_int(rdev, reg, uV, uV, &selector);
 674 }
 675
 676 static int wm831x_buckp_get_voltage_sel(struct regulator_dev *rdev)
 677 {
 678         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 679         struct wm831x *wm831x = dcdc->wm831x;
 680         u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
 681         int val;
 682
 683         val = wm831x_reg_read(wm831x, reg);
 684         if (val < 0)
 685                 return val;
 686
 687         return val & WM831X_DC3_ON_VSEL_MASK;
 688 }
 689
 690 static struct regulator_ops wm831x_buckp_ops = {
 691         .set_voltage = wm831x_buckp_set_voltage,
 692         .get_voltage_sel = wm831x_buckp_get_voltage_sel,
 693         .list_voltage = wm831x_buckp_list_voltage,
 694         .set_suspend_voltage = wm831x_buckp_set_suspend_voltage,
 695
 696         .is_enabled = wm831x_dcdc_is_enabled,
 697         .enable = wm831x_dcdc_enable,
 698         .disable = wm831x_dcdc_disable,
 699         .get_status = wm831x_dcdc_get_status,
 700         .get_mode = wm831x_dcdc_get_mode,
 701         .set_mode = wm831x_dcdc_set_mode,
 702         .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
 703 };
 704
 705 static __devinit int wm831x_buckp_probe(struct platform_device *pdev)
 706 {
 707         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 708         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
 709         int id;
 710         struct wm831x_dcdc *dcdc;
 711         struct resource *res;
 712         int ret, irq;
 713
 714         if (pdata && pdata->wm831x_num)
 715                 id = (pdata->wm831x_num * 10) + 1;
 716         else
 717                 id = 0;
 718         id = pdev->id - id;
 719
 720         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
 721
 722         if (pdata == NULL || pdata->dcdc[id] == NULL)
 723                 return -ENODEV;
 724
 725         dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
 726         if (dcdc == NULL) {
 727                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 728                 return -ENOMEM;
 729         }
 730
 731         dcdc->wm831x = wm831x;
 732
 733         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 734         if (res == NULL) {
 735                 dev_err(&pdev->dev, "No I/O resource\n");
 736                 ret = -EINVAL;
 737                 goto err;
 738         }
 739         dcdc->base = res->start;
 740
 741         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
 742         dcdc->desc.name = dcdc->name;
 743         dcdc->desc.id = id;
 744         dcdc->desc.type = REGULATOR_VOLTAGE;
 745         dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1;
 746         dcdc->desc.ops = &wm831x_buckp_ops;
 747         dcdc->desc.owner = THIS_MODULE;
 748
 749         dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
 750                                              pdata->dcdc[id], dcdc);
 751         if (IS_ERR(dcdc->regulator)) {
 752                 ret = PTR_ERR(dcdc->regulator);
 753                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
 754                         id + 1, ret);
 755                 goto err;
 756         }
 757
 758         irq = platform_get_irq_byname(pdev, "UV");
 759         ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
 760                                    IRQF_TRIGGER_RISING, dcdc->name, dcdc);
 761         if (ret != 0) {
 762                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
 763                         irq, ret);
 764                 goto err_regulator;
 765         }
 766
 767         platform_set_drvdata(pdev, dcdc);
 768
 769         return 0;
 770
 771 err_regulator:
 772         regulator_unregister(dcdc->regulator);
 773 err:
 774         kfree(dcdc);
 775         return ret;
 776 }
 777
 778 static __devexit int wm831x_buckp_remove(struct platform_device *pdev)
 779 {
 780         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
 781
 782         platform_set_drvdata(pdev, NULL);
 783
 784         free_irq(platform_get_irq_byname(pdev, "UV"), dcdc);
 785         regulator_unregister(dcdc->regulator);
 786         kfree(dcdc);
 787
 788         return 0;
 789 }
 790
 791 static struct platform_driver wm831x_buckp_driver = {
 792         .probe = wm831x_buckp_probe,
 793         .remove = __devexit_p(wm831x_buckp_remove),
 794         .driver         = {
 795                 .name   = "wm831x-buckp",
 796                 .owner  = THIS_MODULE,
 797         },
 798 };
 799
 800 /*
 801  * DCDC boost convertors
 802  */
 803
 804 static int wm831x_boostp_get_status(struct regulator_dev *rdev)
 805 {
 806         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 807         struct wm831x *wm831x = dcdc->wm831x;
 808         int ret;
 809
 810         /* First, check for errors */
 811         ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
 812         if (ret < 0)
 813                 return ret;
 814
 815         if (ret & (1 << rdev_get_id(rdev))) {
 816                 dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
 817                         rdev_get_id(rdev) + 1);
 818                 return REGULATOR_STATUS_ERROR;
 819         }
 820
 821         /* Is the regulator on? */
 822         ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
 823         if (ret < 0)
 824                 return ret;
 825         if (ret & (1 << rdev_get_id(rdev)))
 826                 return REGULATOR_STATUS_ON;
 827         else
 828                 return REGULATOR_STATUS_OFF;
 829 }
 830
 831 static struct regulator_ops wm831x_boostp_ops = {
 832         .get_status = wm831x_boostp_get_status,
 833
 834         .is_enabled = wm831x_dcdc_is_enabled,
 835         .enable = wm831x_dcdc_enable,
 836         .disable = wm831x_dcdc_disable,
 837 };
 838
 839 static __devinit int wm831x_boostp_probe(struct platform_device *pdev)
 840 {
 841         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 842         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
 843         int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
 844         struct wm831x_dcdc *dcdc;
 845         struct resource *res;
 846         int ret, irq;
 847
 848         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
 849
 850         if (pdata == NULL || pdata->dcdc[id] == NULL)
 851                 return -ENODEV;
 852
 853         dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
 854         if (dcdc == NULL) {
 855                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 856                 return -ENOMEM;
 857         }
 858
 859         dcdc->wm831x = wm831x;
 860
 861         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 862         if (res == NULL) {
 863                 dev_err(&pdev->dev, "No I/O resource\n");
 864                 ret = -EINVAL;
 865                 goto err;
 866         }
 867         dcdc->base = res->start;
 868
 869         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
 870         dcdc->desc.name = dcdc->name;
 871         dcdc->desc.id = id;
 872         dcdc->desc.type = REGULATOR_VOLTAGE;
 873         dcdc->desc.ops = &wm831x_boostp_ops;
 874         dcdc->desc.owner = THIS_MODULE;
 875
 876         dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
 877                                              pdata->dcdc[id], dcdc);
 878         if (IS_ERR(dcdc->regulator)) {
 879                 ret = PTR_ERR(dcdc->regulator);
 880                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
 881                         id + 1, ret);
 882                 goto err;
 883         }
 884
 885         irq = platform_get_irq_byname(pdev, "UV");
 886         ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
 887                                    IRQF_TRIGGER_RISING, dcdc->name,
 888                                    dcdc);
 889         if (ret != 0) {
 890                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
 891                         irq, ret);
 892                 goto err_regulator;
 893         }
 894
 895         platform_set_drvdata(pdev, dcdc);
 896
 897         return 0;
 898
 899 err_regulator:
 900         regulator_unregister(dcdc->regulator);
 901 err:
 902         kfree(dcdc);
 903         return ret;
 904 }
 905
 906 static __devexit int wm831x_boostp_remove(struct platform_device *pdev)
 907 {
 908         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
 909
 910         platform_set_drvdata(pdev, NULL);
 911
 912         free_irq(platform_get_irq_byname(pdev, "UV"), dcdc);
 913         regulator_unregister(dcdc->regulator);
 914         kfree(dcdc);
 915
 916         return 0;
 917 }
 918
 919 static struct platform_driver wm831x_boostp_driver = {
 920         .probe = wm831x_boostp_probe,
 921         .remove = __devexit_p(wm831x_boostp_remove),
 922         .driver         = {
 923                 .name   = "wm831x-boostp",
 924                 .owner  = THIS_MODULE,
 925         },
 926 };
 927
 928 /*
 929  * External Power Enable
 930  *
 931  * These aren't actually DCDCs but look like them in hardware so share
 932  * code.
 933  */
 934
 935 #define WM831X_EPE_BASE 6
 936
 937 static struct regulator_ops wm831x_epe_ops = {
 938         .is_enabled = wm831x_dcdc_is_enabled,
 939         .enable = wm831x_dcdc_enable,
 940         .disable = wm831x_dcdc_disable,
 941         .get_status = wm831x_dcdc_get_status,
 942 };
 943
 944 static __devinit int wm831x_epe_probe(struct platform_device *pdev)
 945 {
 946         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 947         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
 948         int id = pdev->id % ARRAY_SIZE(pdata->epe);
 949         struct wm831x_dcdc *dcdc;
 950         int ret;
 951
 952         dev_dbg(&pdev->dev, "Probing EPE%d\n", id + 1);
 953
 954         if (pdata == NULL || pdata->epe[id] == NULL)
 955                 return -ENODEV;
 956
 957         dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
 958         if (dcdc == NULL) {
 959                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 960                 return -ENOMEM;
 961         }
 962
 963         dcdc->wm831x = wm831x;
 964
 965         /* For current parts this is correct; probably need to revisit
 966          * in future.
 967          */
 968         snprintf(dcdc->name, sizeof(dcdc->name), "EPE%d", id + 1);
 969         dcdc->desc.name = dcdc->name;
 970         dcdc->desc.id = id + WM831X_EPE_BASE; /* Offset in DCDC registers */
 971         dcdc->desc.ops = &wm831x_epe_ops;
 972         dcdc->desc.type = REGULATOR_VOLTAGE;
 973         dcdc->desc.owner = THIS_MODULE;
 974
 975         dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
 976                                              pdata->epe[id], dcdc);
 977         if (IS_ERR(dcdc->regulator)) {
 978                 ret = PTR_ERR(dcdc->regulator);
 979                 dev_err(wm831x->dev, "Failed to register EPE%d: %d\n",
 980                         id + 1, ret);
 981                 goto err;
 982         }
 983
 984         platform_set_drvdata(pdev, dcdc);
 985
 986         return 0;
 987
 988 err:
 989         kfree(dcdc);
 990         return ret;
 991 }
 992
 993 static __devexit int wm831x_epe_remove(struct platform_device *pdev)
 994 {
 995         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
 996
 997         platform_set_drvdata(pdev, NULL);
 998
 999         regulator_unregister(dcdc->regulator);
1000         kfree(dcdc);
1001
1002         return 0;
1003 }
1004
1005 static struct platform_driver wm831x_epe_driver = {
1006         .probe = wm831x_epe_probe,
1007         .remove = __devexit_p(wm831x_epe_remove),
1008         .driver         = {
1009                 .name   = "wm831x-epe",
1010                 .owner  = THIS_MODULE,
1011         },
1012 };
1013
1014 static int __init wm831x_dcdc_init(void)
1015 {
1016         int ret;
1017         ret = platform_driver_register(&wm831x_buckv_driver);
1018         if (ret != 0)
1019                 pr_err("Failed to register WM831x BUCKV driver: %d\n", ret);
1020
1021         ret = platform_driver_register(&wm831x_buckp_driver);
1022         if (ret != 0)
1023                 pr_err("Failed to register WM831x BUCKP driver: %d\n", ret);
1024
1025         ret = platform_driver_register(&wm831x_boostp_driver);
1026         if (ret != 0)
1027                 pr_err("Failed to register WM831x BOOST driver: %d\n", ret);
1028
1029         ret = platform_driver_register(&wm831x_epe_driver);
1030         if (ret != 0)
1031                 pr_err("Failed to register WM831x EPE driver: %d\n", ret);
1032
1033         return 0;
1034 }
1035 subsys_initcall(wm831x_dcdc_init);
1036
1037 static void __exit wm831x_dcdc_exit(void)
1038 {
1039         platform_driver_unregister(&wm831x_epe_driver);
1040         platform_driver_unregister(&wm831x_boostp_driver);
1041         platform_driver_unregister(&wm831x_buckp_driver);
1042         platform_driver_unregister(&wm831x_buckv_driver);
1043 }
1044 module_exit(wm831x_dcdc_exit);
1045
1046 /* Module information */
1047 MODULE_AUTHOR("Mark Brown");
1048 MODULE_DESCRIPTION("WM831x DC-DC convertor driver");
1049 MODULE_LICENSE("GPL");
1050 MODULE_ALIAS("platform:wm831x-buckv");
1051 MODULE_ALIAS("platform:wm831x-buckp");
1052 MODULE_ALIAS("platform:wm831x-epe");