drivers/regulator/wm831x-dcdc.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 //
   3 // wm831x-dcdc.c  --  DC-DC buck converter driver for the WM831x series
   4 //
   5 // Copyright 2009 Wolfson Microelectronics PLC.
   6 //
   7 // Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
   8
   9 #include <linux/module.h>
  10 #include <linux/moduleparam.h>
  11 #include <linux/init.h>
  12 #include <linux/bitops.h>
  13 #include <linux/err.h>
  14 #include <linux/i2c.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/regulator/driver.h>
  17 #include <linux/regulator/machine.h>
  18 #include <linux/gpio.h>
  19 #include <linux/slab.h>
  20
  21 #include <linux/mfd/wm831x/core.h>
  22 #include <linux/mfd/wm831x/regulator.h>
  23 #include <linux/mfd/wm831x/pdata.h>
  24
  25 #define WM831X_BUCKV_MAX_SELECTOR 0x68
  26 #define WM831X_BUCKP_MAX_SELECTOR 0x66
  27
  28 #define WM831X_DCDC_MODE_FAST    0
  29 #define WM831X_DCDC_MODE_NORMAL  1
  30 #define WM831X_DCDC_MODE_IDLE    2
  31 #define WM831X_DCDC_MODE_STANDBY 3
  32
  33 #define WM831X_DCDC_MAX_NAME 9
  34
  35 /* Register offsets in control block */
  36 #define WM831X_DCDC_CONTROL_1     0
  37 #define WM831X_DCDC_CONTROL_2     1
  38 #define WM831X_DCDC_ON_CONFIG     2
  39 #define WM831X_DCDC_SLEEP_CONTROL 3
  40 #define WM831X_DCDC_DVS_CONTROL   4
  41
  42 /*
  43  * Shared
  44  */
  45
  46 struct wm831x_dcdc {
  47         char name[WM831X_DCDC_MAX_NAME];
  48         char supply_name[WM831X_DCDC_MAX_NAME];
  49         struct regulator_desc desc;
  50         int base;
  51         struct wm831x *wm831x;
  52         struct regulator_dev *regulator;
  53         int dvs_gpio;
  54         int dvs_gpio_state;
  55         int on_vsel;
  56         int dvs_vsel;
  57 };
  58
  59 static unsigned int wm831x_dcdc_get_mode(struct regulator_dev *rdev)
  60
  61 {
  62         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
  63         struct wm831x *wm831x = dcdc->wm831x;
  64         u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
  65         int val;
  66
  67         val = wm831x_reg_read(wm831x, reg);
  68         if (val < 0)
  69                 return val;
  70
  71         val = (val & WM831X_DC1_ON_MODE_MASK) >> WM831X_DC1_ON_MODE_SHIFT;
  72
  73         switch (val) {
  74         case WM831X_DCDC_MODE_FAST:
  75                 return REGULATOR_MODE_FAST;
  76         case WM831X_DCDC_MODE_NORMAL:
  77                 return REGULATOR_MODE_NORMAL;
  78         case WM831X_DCDC_MODE_STANDBY:
  79                 return REGULATOR_MODE_STANDBY;
  80         case WM831X_DCDC_MODE_IDLE:
  81                 return REGULATOR_MODE_IDLE;
  82         default:
  83                 BUG();
  84                 return -EINVAL;
  85         }
  86 }
  87
  88 static int wm831x_dcdc_set_mode_int(struct wm831x *wm831x, int reg,
  89                                     unsigned int mode)
  90 {
  91         int val;
  92
  93         switch (mode) {
  94         case REGULATOR_MODE_FAST:
  95                 val = WM831X_DCDC_MODE_FAST;
  96                 break;
  97         case REGULATOR_MODE_NORMAL:
  98                 val = WM831X_DCDC_MODE_NORMAL;
  99                 break;
 100         case REGULATOR_MODE_STANDBY:
 101                 val = WM831X_DCDC_MODE_STANDBY;
 102                 break;
 103         case REGULATOR_MODE_IDLE:
 104                 val = WM831X_DCDC_MODE_IDLE;
 105                 break;
 106         default:
 107                 return -EINVAL;
 108         }
 109
 110         return wm831x_set_bits(wm831x, reg, WM831X_DC1_ON_MODE_MASK,
 111                                val << WM831X_DC1_ON_MODE_SHIFT);
 112 }
 113
 114 static int wm831x_dcdc_set_mode(struct regulator_dev *rdev, unsigned int mode)
 115 {
 116         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 117         struct wm831x *wm831x = dcdc->wm831x;
 118         u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
 119
 120         return wm831x_dcdc_set_mode_int(wm831x, reg, mode);
 121 }
 122
 123 static int wm831x_dcdc_set_suspend_mode(struct regulator_dev *rdev,
 124                                         unsigned int mode)
 125 {
 126         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 127         struct wm831x *wm831x = dcdc->wm831x;
 128         u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
 129
 130         return wm831x_dcdc_set_mode_int(wm831x, reg, mode);
 131 }
 132
 133 static int wm831x_dcdc_get_status(struct regulator_dev *rdev)
 134 {
 135         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 136         struct wm831x *wm831x = dcdc->wm831x;
 137         int ret;
 138
 139         /* First, check for errors */
 140         ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
 141         if (ret < 0)
 142                 return ret;
 143
 144         if (ret & (1 << rdev_get_id(rdev))) {
 145                 dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
 146                         rdev_get_id(rdev) + 1);
 147                 return REGULATOR_STATUS_ERROR;
 148         }
 149
 150         /* DCDC1 and DCDC2 can additionally detect high voltage/current */
 151         if (rdev_get_id(rdev) < 2) {
 152                 if (ret & (WM831X_DC1_OV_STS << rdev_get_id(rdev))) {
 153                         dev_dbg(wm831x->dev, "DCDC%d over voltage\n",
 154                                 rdev_get_id(rdev) + 1);
 155                         return REGULATOR_STATUS_ERROR;
 156                 }
 157
 158                 if (ret & (WM831X_DC1_HC_STS << rdev_get_id(rdev))) {
 159                         dev_dbg(wm831x->dev, "DCDC%d over current\n",
 160                                 rdev_get_id(rdev) + 1);
 161                         return REGULATOR_STATUS_ERROR;
 162                 }
 163         }
 164
 165         /* Is the regulator on? */
 166         ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
 167         if (ret < 0)
 168                 return ret;
 169         if (!(ret & (1 << rdev_get_id(rdev))))
 170                 return REGULATOR_STATUS_OFF;
 171
 172         /* TODO: When we handle hardware control modes so we can report the
 173          * current mode. */
 174         return REGULATOR_STATUS_ON;
 175 }
 176
 177 static irqreturn_t wm831x_dcdc_uv_irq(int irq, void *data)
 178 {
 179         struct wm831x_dcdc *dcdc = data;
 180
 181         regulator_lock(dcdc->regulator);
 182         regulator_notifier_call_chain(dcdc->regulator,
 183                                       REGULATOR_EVENT_UNDER_VOLTAGE,
 184                                       NULL);
 185         regulator_unlock(dcdc->regulator);
 186
 187         return IRQ_HANDLED;
 188 }
 189
 190 static irqreturn_t wm831x_dcdc_oc_irq(int irq, void *data)
 191 {
 192         struct wm831x_dcdc *dcdc = data;
 193
 194         regulator_lock(dcdc->regulator);
 195         regulator_notifier_call_chain(dcdc->regulator,
 196                                       REGULATOR_EVENT_OVER_CURRENT,
 197                                       NULL);
 198         regulator_unlock(dcdc->regulator);
 199
 200         return IRQ_HANDLED;
 201 }
 202
 203 /*
 204  * BUCKV specifics
 205  */
 206
 207 static const struct regulator_linear_range wm831x_buckv_ranges[] = {
 208         REGULATOR_LINEAR_RANGE(600000, 0, 0x7, 0),
 209         REGULATOR_LINEAR_RANGE(600000, 0x8, 0x68, 12500),
 210 };
 211
 212 static int wm831x_buckv_set_dvs(struct regulator_dev *rdev, int state)
 213 {
 214         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 215
 216         if (state == dcdc->dvs_gpio_state)
 217                 return 0;
 218
 219         dcdc->dvs_gpio_state = state;
 220         gpio_set_value(dcdc->dvs_gpio, state);
 221
 222         /* Should wait for DVS state change to be asserted if we have
 223          * a GPIO for it, for now assume the device is configured
 224          * for the fastest possible transition.
 225          */
 226
 227         return 0;
 228 }
 229
 230 static int wm831x_buckv_set_voltage_sel(struct regulator_dev *rdev,
 231                                         unsigned vsel)
 232 {
 233         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 234         struct wm831x *wm831x = dcdc->wm831x;
 235         int on_reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
 236         int dvs_reg = dcdc->base + WM831X_DCDC_DVS_CONTROL;
 237         int ret;
 238
 239         /* If this value is already set then do a GPIO update if we can */
 240         if (dcdc->dvs_gpio && dcdc->on_vsel == vsel)
 241                 return wm831x_buckv_set_dvs(rdev, 0);
 242
 243         if (dcdc->dvs_gpio && dcdc->dvs_vsel == vsel)
 244                 return wm831x_buckv_set_dvs(rdev, 1);
 245
 246         /* Always set the ON status to the minimum voltage */
 247         ret = wm831x_set_bits(wm831x, on_reg, WM831X_DC1_ON_VSEL_MASK, vsel);
 248         if (ret < 0)
 249                 return ret;
 250         dcdc->on_vsel = vsel;
 251
 252         if (!dcdc->dvs_gpio)
 253                 return ret;
 254
 255         /* Kick the voltage transition now */
 256         ret = wm831x_buckv_set_dvs(rdev, 0);
 257         if (ret < 0)
 258                 return ret;
 259
 260         /*
 261          * If this VSEL is higher than the last one we've seen then
 262          * remember it as the DVS VSEL.  This is optimised for CPUfreq
 263          * usage where we want to get to the highest voltage very
 264          * quickly.
 265          */
 266         if (vsel > dcdc->dvs_vsel) {
 267                 ret = wm831x_set_bits(wm831x, dvs_reg,
 268                                       WM831X_DC1_DVS_VSEL_MASK,
 269                                       vsel);
 270                 if (ret == 0)
 271                         dcdc->dvs_vsel = vsel;
 272                 else
 273                         dev_warn(wm831x->dev,
 274                                  "Failed to set DCDC DVS VSEL: %d\n", ret);
 275         }
 276
 277         return 0;
 278 }
 279
 280 static int wm831x_buckv_set_suspend_voltage(struct regulator_dev *rdev,
 281                                             int uV)
 282 {
 283         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 284         struct wm831x *wm831x = dcdc->wm831x;
 285         u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
 286         int vsel;
 287
 288         vsel = regulator_map_voltage_linear_range(rdev, uV, uV);
 289         if (vsel < 0)
 290                 return vsel;
 291
 292         return wm831x_set_bits(wm831x, reg, WM831X_DC1_SLP_VSEL_MASK, vsel);
 293 }
 294
 295 static int wm831x_buckv_get_voltage_sel(struct regulator_dev *rdev)
 296 {
 297         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 298
 299         if (dcdc->dvs_gpio && dcdc->dvs_gpio_state)
 300                 return dcdc->dvs_vsel;
 301         else
 302                 return dcdc->on_vsel;
 303 }
 304
 305 /* Current limit options */
 306 static const unsigned int wm831x_dcdc_ilim[] = {
 307         125000, 250000, 375000, 500000, 625000, 750000, 875000, 1000000
 308 };
 309
 310 static const struct regulator_ops wm831x_buckv_ops = {
 311         .set_voltage_sel = wm831x_buckv_set_voltage_sel,
 312         .get_voltage_sel = wm831x_buckv_get_voltage_sel,
 313         .list_voltage = regulator_list_voltage_linear_range,
 314         .map_voltage = regulator_map_voltage_linear_range,
 315         .set_suspend_voltage = wm831x_buckv_set_suspend_voltage,
 316         .set_current_limit = regulator_set_current_limit_regmap,
 317         .get_current_limit = regulator_get_current_limit_regmap,
 318
 319         .is_enabled = regulator_is_enabled_regmap,
 320         .enable = regulator_enable_regmap,
 321         .disable = regulator_disable_regmap,
 322         .get_status = wm831x_dcdc_get_status,
 323         .get_mode = wm831x_dcdc_get_mode,
 324         .set_mode = wm831x_dcdc_set_mode,
 325         .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
 326 };
 327
 328 /*
 329  * Set up DVS control.  We just log errors since we can still run
 330  * (with reduced performance) if we fail.
 331  */
 332 static void wm831x_buckv_dvs_init(struct platform_device *pdev,
 333                                   struct wm831x_dcdc *dcdc,
 334                                   struct wm831x_buckv_pdata *pdata)
 335 {
 336         struct wm831x *wm831x = dcdc->wm831x;
 337         int ret;
 338         u16 ctrl;
 339
 340         if (!pdata || !pdata->dvs_gpio)
 341                 return;
 342
 343         /* gpiolib won't let us read the GPIO status so pick the higher
 344          * of the two existing voltages so we take it as platform data.
 345          */
 346         dcdc->dvs_gpio_state = pdata->dvs_init_state;
 347
 348         ret = devm_gpio_request_one(&pdev->dev, pdata->dvs_gpio,
 349                                     dcdc->dvs_gpio_state ? GPIOF_INIT_HIGH : 0,
 350                                     "DCDC DVS");
 351         if (ret < 0) {
 352                 dev_err(wm831x->dev, "Failed to get %s DVS GPIO: %d\n",
 353                         dcdc->name, ret);
 354                 return;
 355         }
 356
 357         dcdc->dvs_gpio = pdata->dvs_gpio;
 358
 359         switch (pdata->dvs_control_src) {
 360         case 1:
 361                 ctrl = 2 << WM831X_DC1_DVS_SRC_SHIFT;
 362                 break;
 363         case 2:
 364                 ctrl = 3 << WM831X_DC1_DVS_SRC_SHIFT;
 365                 break;
 366         default:
 367                 dev_err(wm831x->dev, "Invalid DVS control source %d for %s\n",
 368                         pdata->dvs_control_src, dcdc->name);
 369                 return;
 370         }
 371
 372         /* If DVS_VSEL is set to the minimum value then raise it to ON_VSEL
 373          * to make bootstrapping a bit smoother.
 374          */
 375         if (!dcdc->dvs_vsel) {
 376                 ret = wm831x_set_bits(wm831x,
 377                                       dcdc->base + WM831X_DCDC_DVS_CONTROL,
 378                                       WM831X_DC1_DVS_VSEL_MASK, dcdc->on_vsel);
 379                 if (ret == 0)
 380                         dcdc->dvs_vsel = dcdc->on_vsel;
 381                 else
 382                         dev_warn(wm831x->dev, "Failed to set DVS_VSEL: %d\n",
 383                                  ret);
 384         }
 385
 386         ret = wm831x_set_bits(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL,
 387                               WM831X_DC1_DVS_SRC_MASK, ctrl);
 388         if (ret < 0) {
 389                 dev_err(wm831x->dev, "Failed to set %s DVS source: %d\n",
 390                         dcdc->name, ret);
 391         }
 392 }
 393
 394 static int wm831x_buckv_probe(struct platform_device *pdev)
 395 {
 396         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 397         struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
 398         struct regulator_config config = { };
 399         int id;
 400         struct wm831x_dcdc *dcdc;
 401         struct resource *res;
 402         int ret, irq;
 403
 404         if (pdata && pdata->wm831x_num)
 405                 id = (pdata->wm831x_num * 10) + 1;
 406         else
 407                 id = 0;
 408         id = pdev->id - id;
 409
 410         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
 411
 412         dcdc = devm_kzalloc(&pdev->dev,  sizeof(struct wm831x_dcdc),
 413                             GFP_KERNEL);
 414         if (!dcdc)
 415                 return -ENOMEM;
 416
 417         dcdc->wm831x = wm831x;
 418
 419         res = platform_get_resource(pdev, IORESOURCE_REG, 0);
 420         if (res == NULL) {
 421                 dev_err(&pdev->dev, "No REG resource\n");
 422                 ret = -EINVAL;
 423                 goto err;
 424         }
 425         dcdc->base = res->start;
 426
 427         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
 428         dcdc->desc.name = dcdc->name;
 429
 430         snprintf(dcdc->supply_name, sizeof(dcdc->supply_name),
 431                  "DC%dVDD", id + 1);
 432         dcdc->desc.supply_name = dcdc->supply_name;
 433
 434         dcdc->desc.id = id;
 435         dcdc->desc.type = REGULATOR_VOLTAGE;
 436         dcdc->desc.n_voltages = WM831X_BUCKV_MAX_SELECTOR + 1;
 437         dcdc->desc.linear_ranges = wm831x_buckv_ranges;
 438         dcdc->desc.n_linear_ranges = ARRAY_SIZE(wm831x_buckv_ranges);
 439         dcdc->desc.ops = &wm831x_buckv_ops;
 440         dcdc->desc.owner = THIS_MODULE;
 441         dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
 442         dcdc->desc.enable_mask = 1 << id;
 443         dcdc->desc.csel_reg = dcdc->base + WM831X_DCDC_CONTROL_2;
 444         dcdc->desc.csel_mask = WM831X_DC1_HC_THR_MASK;
 445         dcdc->desc.n_current_limits = ARRAY_SIZE(wm831x_dcdc_ilim);
 446         dcdc->desc.curr_table = wm831x_dcdc_ilim;
 447
 448         ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG);
 449         if (ret < 0) {
 450                 dev_err(wm831x->dev, "Failed to read ON VSEL: %d\n", ret);
 451                 goto err;
 452         }
 453         dcdc->on_vsel = ret & WM831X_DC1_ON_VSEL_MASK;
 454
 455         ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL);
 456         if (ret < 0) {
 457                 dev_err(wm831x->dev, "Failed to read DVS VSEL: %d\n", ret);
 458                 goto err;
 459         }
 460         dcdc->dvs_vsel = ret & WM831X_DC1_DVS_VSEL_MASK;
 461
 462         if (pdata && pdata->dcdc[id])
 463                 wm831x_buckv_dvs_init(pdev, dcdc,
 464                                       pdata->dcdc[id]->driver_data);
 465
 466         config.dev = pdev->dev.parent;
 467         if (pdata)
 468                 config.init_data = pdata->dcdc[id];
 469         config.driver_data = dcdc;
 470         config.regmap = wm831x->regmap;
 471
 472         dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc,
 473                                                   &config);
 474         if (IS_ERR(dcdc->regulator)) {
 475                 ret = PTR_ERR(dcdc->regulator);
 476                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
 477                         id + 1, ret);
 478                 goto err;
 479         }
 480
 481         irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
 482         ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
 483                                         wm831x_dcdc_uv_irq,
 484                                         IRQF_TRIGGER_RISING | IRQF_ONESHOT,
 485                                         dcdc->name, dcdc);
 486         if (ret != 0) {
 487                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
 488                         irq, ret);
 489                 goto err;
 490         }
 491
 492         irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "HC"));
 493         ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
 494                                         wm831x_dcdc_oc_irq,
 495                                         IRQF_TRIGGER_RISING | IRQF_ONESHOT,
 496                                         dcdc->name, dcdc);
 497         if (ret != 0) {
 498                 dev_err(&pdev->dev, "Failed to request HC IRQ %d: %d\n",
 499                         irq, ret);
 500                 goto err;
 501         }
 502
 503         platform_set_drvdata(pdev, dcdc);
 504
 505         return 0;
 506
 507 err:
 508         return ret;
 509 }
 510
 511 static struct platform_driver wm831x_buckv_driver = {
 512         .probe = wm831x_buckv_probe,
 513         .driver         = {
 514                 .name   = "wm831x-buckv",
 515         },
 516 };
 517
 518 /*
 519  * BUCKP specifics
 520  */
 521
 522 static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev, int uV)
 523 {
 524         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 525         struct wm831x *wm831x = dcdc->wm831x;
 526         u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
 527         int sel;
 528
 529         sel = regulator_map_voltage_linear(rdev, uV, uV);
 530         if (sel < 0)
 531                 return sel;
 532
 533         return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, sel);
 534 }
 535
 536 static const struct regulator_ops wm831x_buckp_ops = {
 537         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 538         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 539         .list_voltage = regulator_list_voltage_linear,
 540         .map_voltage = regulator_map_voltage_linear,
 541         .set_suspend_voltage = wm831x_buckp_set_suspend_voltage,
 542
 543         .is_enabled = regulator_is_enabled_regmap,
 544         .enable = regulator_enable_regmap,
 545         .disable = regulator_disable_regmap,
 546         .get_status = wm831x_dcdc_get_status,
 547         .get_mode = wm831x_dcdc_get_mode,
 548         .set_mode = wm831x_dcdc_set_mode,
 549         .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
 550 };
 551
 552 static int wm831x_buckp_probe(struct platform_device *pdev)
 553 {
 554         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 555         struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
 556         struct regulator_config config = { };
 557         int id;
 558         struct wm831x_dcdc *dcdc;
 559         struct resource *res;
 560         int ret, irq;
 561
 562         if (pdata && pdata->wm831x_num)
 563                 id = (pdata->wm831x_num * 10) + 1;
 564         else
 565                 id = 0;
 566         id = pdev->id - id;
 567
 568         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
 569
 570         dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc),
 571                             GFP_KERNEL);
 572         if (!dcdc)
 573                 return -ENOMEM;
 574
 575         dcdc->wm831x = wm831x;
 576
 577         res = platform_get_resource(pdev, IORESOURCE_REG, 0);
 578         if (res == NULL) {
 579                 dev_err(&pdev->dev, "No REG resource\n");
 580                 ret = -EINVAL;
 581                 goto err;
 582         }
 583         dcdc->base = res->start;
 584
 585         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
 586         dcdc->desc.name = dcdc->name;
 587
 588         snprintf(dcdc->supply_name, sizeof(dcdc->supply_name),
 589                  "DC%dVDD", id + 1);
 590         dcdc->desc.supply_name = dcdc->supply_name;
 591
 592         dcdc->desc.id = id;
 593         dcdc->desc.type = REGULATOR_VOLTAGE;
 594         dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1;
 595         dcdc->desc.ops = &wm831x_buckp_ops;
 596         dcdc->desc.owner = THIS_MODULE;
 597         dcdc->desc.vsel_reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
 598         dcdc->desc.vsel_mask = WM831X_DC3_ON_VSEL_MASK;
 599         dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
 600         dcdc->desc.enable_mask = 1 << id;
 601         dcdc->desc.min_uV = 850000;
 602         dcdc->desc.uV_step = 25000;
 603
 604         config.dev = pdev->dev.parent;
 605         if (pdata)
 606                 config.init_data = pdata->dcdc[id];
 607         config.driver_data = dcdc;
 608         config.regmap = wm831x->regmap;
 609
 610         dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc,
 611                                                   &config);
 612         if (IS_ERR(dcdc->regulator)) {
 613                 ret = PTR_ERR(dcdc->regulator);
 614                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
 615                         id + 1, ret);
 616                 goto err;
 617         }
 618
 619         irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
 620         ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
 621                                         wm831x_dcdc_uv_irq,
 622                                         IRQF_TRIGGER_RISING | IRQF_ONESHOT,
 623                                         dcdc->name, dcdc);
 624         if (ret != 0) {
 625                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
 626                         irq, ret);
 627                 goto err;
 628         }
 629
 630         platform_set_drvdata(pdev, dcdc);
 631
 632         return 0;
 633
 634 err:
 635         return ret;
 636 }
 637
 638 static struct platform_driver wm831x_buckp_driver = {
 639         .probe = wm831x_buckp_probe,
 640         .driver         = {
 641                 .name   = "wm831x-buckp",
 642         },
 643 };
 644
 645 /*
 646  * DCDC boost convertors
 647  */
 648
 649 static int wm831x_boostp_get_status(struct regulator_dev *rdev)
 650 {
 651         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 652         struct wm831x *wm831x = dcdc->wm831x;
 653         int ret;
 654
 655         /* First, check for errors */
 656         ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
 657         if (ret < 0)
 658                 return ret;
 659
 660         if (ret & (1 << rdev_get_id(rdev))) {
 661                 dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
 662                         rdev_get_id(rdev) + 1);
 663                 return REGULATOR_STATUS_ERROR;
 664         }
 665
 666         /* Is the regulator on? */
 667         ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
 668         if (ret < 0)
 669                 return ret;
 670         if (ret & (1 << rdev_get_id(rdev)))
 671                 return REGULATOR_STATUS_ON;
 672         else
 673                 return REGULATOR_STATUS_OFF;
 674 }
 675
 676 static const struct regulator_ops wm831x_boostp_ops = {
 677         .get_status = wm831x_boostp_get_status,
 678
 679         .is_enabled = regulator_is_enabled_regmap,
 680         .enable = regulator_enable_regmap,
 681         .disable = regulator_disable_regmap,
 682 };
 683
 684 static int wm831x_boostp_probe(struct platform_device *pdev)
 685 {
 686         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 687         struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
 688         struct regulator_config config = { };
 689         int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
 690         struct wm831x_dcdc *dcdc;
 691         struct resource *res;
 692         int ret, irq;
 693
 694         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
 695
 696         if (pdata == NULL || pdata->dcdc[id] == NULL)
 697                 return -ENODEV;
 698
 699         dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), GFP_KERNEL);
 700         if (!dcdc)
 701                 return -ENOMEM;
 702
 703         dcdc->wm831x = wm831x;
 704
 705         res = platform_get_resource(pdev, IORESOURCE_REG, 0);
 706         if (res == NULL) {
 707                 dev_err(&pdev->dev, "No REG resource\n");
 708                 return -EINVAL;
 709         }
 710         dcdc->base = res->start;
 711
 712         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
 713         dcdc->desc.name = dcdc->name;
 714         dcdc->desc.id = id;
 715         dcdc->desc.type = REGULATOR_VOLTAGE;
 716         dcdc->desc.ops = &wm831x_boostp_ops;
 717         dcdc->desc.owner = THIS_MODULE;
 718         dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
 719         dcdc->desc.enable_mask = 1 << id;
 720
 721         config.dev = pdev->dev.parent;
 722         if (pdata)
 723                 config.init_data = pdata->dcdc[id];
 724         config.driver_data = dcdc;
 725         config.regmap = wm831x->regmap;
 726
 727         dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc,
 728                                                   &config);
 729         if (IS_ERR(dcdc->regulator)) {
 730                 ret = PTR_ERR(dcdc->regulator);
 731                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
 732                         id + 1, ret);
 733                 return ret;
 734         }
 735
 736         irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
 737         ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
 738                                         wm831x_dcdc_uv_irq,
 739                                         IRQF_TRIGGER_RISING | IRQF_ONESHOT,
 740                                         dcdc->name,
 741                                         dcdc);
 742         if (ret != 0) {
 743                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
 744                         irq, ret);
 745                 return ret;
 746         }
 747
 748         platform_set_drvdata(pdev, dcdc);
 749
 750         return 0;
 751 }
 752
 753 static struct platform_driver wm831x_boostp_driver = {
 754         .probe = wm831x_boostp_probe,
 755         .driver         = {
 756                 .name   = "wm831x-boostp",
 757         },
 758 };
 759
 760 /*
 761  * External Power Enable
 762  *
 763  * These aren't actually DCDCs but look like them in hardware so share
 764  * code.
 765  */
 766
 767 #define WM831X_EPE_BASE 6
 768
 769 static const struct regulator_ops wm831x_epe_ops = {
 770         .is_enabled = regulator_is_enabled_regmap,
 771         .enable = regulator_enable_regmap,
 772         .disable = regulator_disable_regmap,
 773         .get_status = wm831x_dcdc_get_status,
 774 };
 775
 776 static int wm831x_epe_probe(struct platform_device *pdev)
 777 {
 778         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 779         struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
 780         struct regulator_config config = { };
 781         int id = pdev->id % ARRAY_SIZE(pdata->epe);
 782         struct wm831x_dcdc *dcdc;
 783         int ret;
 784
 785         dev_dbg(&pdev->dev, "Probing EPE%d\n", id + 1);
 786
 787         dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), GFP_KERNEL);
 788         if (!dcdc)
 789                 return -ENOMEM;
 790
 791         dcdc->wm831x = wm831x;
 792
 793         /* For current parts this is correct; probably need to revisit
 794          * in future.
 795          */
 796         snprintf(dcdc->name, sizeof(dcdc->name), "EPE%d", id + 1);
 797         dcdc->desc.name = dcdc->name;
 798         dcdc->desc.id = id + WM831X_EPE_BASE; /* Offset in DCDC registers */
 799         dcdc->desc.ops = &wm831x_epe_ops;
 800         dcdc->desc.type = REGULATOR_VOLTAGE;
 801         dcdc->desc.owner = THIS_MODULE;
 802         dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
 803         dcdc->desc.enable_mask = 1 << dcdc->desc.id;
 804
 805         config.dev = pdev->dev.parent;
 806         if (pdata)
 807                 config.init_data = pdata->epe[id];
 808         config.driver_data = dcdc;
 809         config.regmap = wm831x->regmap;
 810
 811         dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc,
 812                                                   &config);
 813         if (IS_ERR(dcdc->regulator)) {
 814                 ret = PTR_ERR(dcdc->regulator);
 815                 dev_err(wm831x->dev, "Failed to register EPE%d: %d\n",
 816                         id + 1, ret);
 817                 goto err;
 818         }
 819
 820         platform_set_drvdata(pdev, dcdc);
 821
 822         return 0;
 823
 824 err:
 825         return ret;
 826 }
 827
 828 static struct platform_driver wm831x_epe_driver = {
 829         .probe = wm831x_epe_probe,
 830         .driver         = {
 831                 .name   = "wm831x-epe",
 832         },
 833 };
 834
 835 static struct platform_driver * const drivers[] = {
 836         &wm831x_buckv_driver,
 837         &wm831x_buckp_driver,
 838         &wm831x_boostp_driver,
 839         &wm831x_epe_driver,
 840 };
 841
 842 static int __init wm831x_dcdc_init(void)
 843 {
 844         return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
 845 }
 846 subsys_initcall(wm831x_dcdc_init);
 847
 848 static void __exit wm831x_dcdc_exit(void)
 849 {
 850         platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
 851 }
 852 module_exit(wm831x_dcdc_exit);
 853
 854 /* Module information */
 855 MODULE_AUTHOR("Mark Brown");
 856 MODULE_DESCRIPTION("WM831x DC-DC convertor driver");
 857 MODULE_LICENSE("GPL");
 858 MODULE_ALIAS("platform:wm831x-buckv");
 859 MODULE_ALIAS("platform:wm831x-buckp");
 860 MODULE_ALIAS("platform:wm831x-boostp");
 861 MODULE_ALIAS("platform:wm831x-epe");