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