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/consumer.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         struct gpio_desc *dvs_gpiod;
  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         gpiod_set_value(dcdc->dvs_gpiod, 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_gpiod && dcdc->on_vsel == vsel)
 241                 return wm831x_buckv_set_dvs(rdev, 0);
 242
 243         if (dcdc->dvs_gpiod && 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_gpiod)
 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_gpiod && 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)
 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         dcdc->dvs_gpiod = devm_gpiod_get(&pdev->dev, "dvs",
 349                         dcdc->dvs_gpio_state ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW);
 350         if (IS_ERR(dcdc->dvs_gpiod)) {
 351                 dev_err(wm831x->dev, "Failed to get %s DVS GPIO: %ld\n",
 352                         dcdc->name, PTR_ERR(dcdc->dvs_gpiod));
 353                 return;
 354         }
 355
 356         switch (pdata->dvs_control_src) {
 357         case 1:
 358                 ctrl = 2 << WM831X_DC1_DVS_SRC_SHIFT;
 359                 break;
 360         case 2:
 361                 ctrl = 3 << WM831X_DC1_DVS_SRC_SHIFT;
 362                 break;
 363         default:
 364                 dev_err(wm831x->dev, "Invalid DVS control source %d for %s\n",
 365                         pdata->dvs_control_src, dcdc->name);
 366                 return;
 367         }
 368
 369         /* If DVS_VSEL is set to the minimum value then raise it to ON_VSEL
 370          * to make bootstrapping a bit smoother.
 371          */
 372         if (!dcdc->dvs_vsel) {
 373                 ret = wm831x_set_bits(wm831x,
 374                                       dcdc->base + WM831X_DCDC_DVS_CONTROL,
 375                                       WM831X_DC1_DVS_VSEL_MASK, dcdc->on_vsel);
 376                 if (ret == 0)
 377                         dcdc->dvs_vsel = dcdc->on_vsel;
 378                 else
 379                         dev_warn(wm831x->dev, "Failed to set DVS_VSEL: %d\n",
 380                                  ret);
 381         }
 382
 383         ret = wm831x_set_bits(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL,
 384                               WM831X_DC1_DVS_SRC_MASK, ctrl);
 385         if (ret < 0) {
 386                 dev_err(wm831x->dev, "Failed to set %s DVS source: %d\n",
 387                         dcdc->name, ret);
 388         }
 389 }
 390
 391 static int wm831x_buckv_probe(struct platform_device *pdev)
 392 {
 393         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 394         struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
 395         struct regulator_config config = { };
 396         int id;
 397         struct wm831x_dcdc *dcdc;
 398         struct resource *res;
 399         int ret, irq;
 400
 401         if (pdata && pdata->wm831x_num)
 402                 id = (pdata->wm831x_num * 10) + 1;
 403         else
 404                 id = 0;
 405         id = pdev->id - id;
 406
 407         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
 408
 409         dcdc = devm_kzalloc(&pdev->dev,  sizeof(struct wm831x_dcdc),
 410                             GFP_KERNEL);
 411         if (!dcdc)
 412                 return -ENOMEM;
 413
 414         dcdc->wm831x = wm831x;
 415
 416         res = platform_get_resource(pdev, IORESOURCE_REG, 0);
 417         if (res == NULL) {
 418                 dev_err(&pdev->dev, "No REG resource\n");
 419                 ret = -EINVAL;
 420                 goto err;
 421         }
 422         dcdc->base = res->start;
 423
 424         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
 425         dcdc->desc.name = dcdc->name;
 426
 427         snprintf(dcdc->supply_name, sizeof(dcdc->supply_name),
 428                  "DC%dVDD", id + 1);
 429         dcdc->desc.supply_name = dcdc->supply_name;
 430
 431         dcdc->desc.id = id;
 432         dcdc->desc.type = REGULATOR_VOLTAGE;
 433         dcdc->desc.n_voltages = WM831X_BUCKV_MAX_SELECTOR + 1;
 434         dcdc->desc.linear_ranges = wm831x_buckv_ranges;
 435         dcdc->desc.n_linear_ranges = ARRAY_SIZE(wm831x_buckv_ranges);
 436         dcdc->desc.ops = &wm831x_buckv_ops;
 437         dcdc->desc.owner = THIS_MODULE;
 438         dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
 439         dcdc->desc.enable_mask = 1 << id;
 440         dcdc->desc.csel_reg = dcdc->base + WM831X_DCDC_CONTROL_2;
 441         dcdc->desc.csel_mask = WM831X_DC1_HC_THR_MASK;
 442         dcdc->desc.n_current_limits = ARRAY_SIZE(wm831x_dcdc_ilim);
 443         dcdc->desc.curr_table = wm831x_dcdc_ilim;
 444
 445         ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG);
 446         if (ret < 0) {
 447                 dev_err(wm831x->dev, "Failed to read ON VSEL: %d\n", ret);
 448                 goto err;
 449         }
 450         dcdc->on_vsel = ret & WM831X_DC1_ON_VSEL_MASK;
 451
 452         ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL);
 453         if (ret < 0) {
 454                 dev_err(wm831x->dev, "Failed to read DVS VSEL: %d\n", ret);
 455                 goto err;
 456         }
 457         dcdc->dvs_vsel = ret & WM831X_DC1_DVS_VSEL_MASK;
 458
 459         if (pdata && pdata->dcdc[id])
 460                 wm831x_buckv_dvs_init(pdev, dcdc,
 461                                       pdata->dcdc[id]->driver_data);
 462
 463         config.dev = pdev->dev.parent;
 464         if (pdata)
 465                 config.init_data = pdata->dcdc[id];
 466         config.driver_data = dcdc;
 467         config.regmap = wm831x->regmap;
 468
 469         dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc,
 470                                                   &config);
 471         if (IS_ERR(dcdc->regulator)) {
 472                 ret = PTR_ERR(dcdc->regulator);
 473                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
 474                         id + 1, ret);
 475                 goto err;
 476         }
 477
 478         irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
 479         ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
 480                                         wm831x_dcdc_uv_irq,
 481                                         IRQF_TRIGGER_RISING | IRQF_ONESHOT,
 482                                         dcdc->name, dcdc);
 483         if (ret != 0) {
 484                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
 485                         irq, ret);
 486                 goto err;
 487         }
 488
 489         irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "HC"));
 490         ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
 491                                         wm831x_dcdc_oc_irq,
 492                                         IRQF_TRIGGER_RISING | IRQF_ONESHOT,
 493                                         dcdc->name, dcdc);
 494         if (ret != 0) {
 495                 dev_err(&pdev->dev, "Failed to request HC IRQ %d: %d\n",
 496                         irq, ret);
 497                 goto err;
 498         }
 499
 500         platform_set_drvdata(pdev, dcdc);
 501
 502         return 0;
 503
 504 err:
 505         return ret;
 506 }
 507
 508 static struct platform_driver wm831x_buckv_driver = {
 509         .probe = wm831x_buckv_probe,
 510         .driver         = {
 511                 .name   = "wm831x-buckv",
 512         },
 513 };
 514
 515 /*
 516  * BUCKP specifics
 517  */
 518
 519 static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev, int uV)
 520 {
 521         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 522         struct wm831x *wm831x = dcdc->wm831x;
 523         u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
 524         int sel;
 525
 526         sel = regulator_map_voltage_linear(rdev, uV, uV);
 527         if (sel < 0)
 528                 return sel;
 529
 530         return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, sel);
 531 }
 532
 533 static const struct regulator_ops wm831x_buckp_ops = {
 534         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 535         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 536         .list_voltage = regulator_list_voltage_linear,
 537         .map_voltage = regulator_map_voltage_linear,
 538         .set_suspend_voltage = wm831x_buckp_set_suspend_voltage,
 539
 540         .is_enabled = regulator_is_enabled_regmap,
 541         .enable = regulator_enable_regmap,
 542         .disable = regulator_disable_regmap,
 543         .get_status = wm831x_dcdc_get_status,
 544         .get_mode = wm831x_dcdc_get_mode,
 545         .set_mode = wm831x_dcdc_set_mode,
 546         .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
 547 };
 548
 549 static int wm831x_buckp_probe(struct platform_device *pdev)
 550 {
 551         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 552         struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
 553         struct regulator_config config = { };
 554         int id;
 555         struct wm831x_dcdc *dcdc;
 556         struct resource *res;
 557         int ret, irq;
 558
 559         if (pdata && pdata->wm831x_num)
 560                 id = (pdata->wm831x_num * 10) + 1;
 561         else
 562                 id = 0;
 563         id = pdev->id - id;
 564
 565         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
 566
 567         dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc),
 568                             GFP_KERNEL);
 569         if (!dcdc)
 570                 return -ENOMEM;
 571
 572         dcdc->wm831x = wm831x;
 573
 574         res = platform_get_resource(pdev, IORESOURCE_REG, 0);
 575         if (res == NULL) {
 576                 dev_err(&pdev->dev, "No REG resource\n");
 577                 ret = -EINVAL;
 578                 goto err;
 579         }
 580         dcdc->base = res->start;
 581
 582         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
 583         dcdc->desc.name = dcdc->name;
 584
 585         snprintf(dcdc->supply_name, sizeof(dcdc->supply_name),
 586                  "DC%dVDD", id + 1);
 587         dcdc->desc.supply_name = dcdc->supply_name;
 588
 589         dcdc->desc.id = id;
 590         dcdc->desc.type = REGULATOR_VOLTAGE;
 591         dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1;
 592         dcdc->desc.ops = &wm831x_buckp_ops;
 593         dcdc->desc.owner = THIS_MODULE;
 594         dcdc->desc.vsel_reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
 595         dcdc->desc.vsel_mask = WM831X_DC3_ON_VSEL_MASK;
 596         dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
 597         dcdc->desc.enable_mask = 1 << id;
 598         dcdc->desc.min_uV = 850000;
 599         dcdc->desc.uV_step = 25000;
 600
 601         config.dev = pdev->dev.parent;
 602         if (pdata)
 603                 config.init_data = pdata->dcdc[id];
 604         config.driver_data = dcdc;
 605         config.regmap = wm831x->regmap;
 606
 607         dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc,
 608                                                   &config);
 609         if (IS_ERR(dcdc->regulator)) {
 610                 ret = PTR_ERR(dcdc->regulator);
 611                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
 612                         id + 1, ret);
 613                 goto err;
 614         }
 615
 616         irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
 617         ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
 618                                         wm831x_dcdc_uv_irq,
 619                                         IRQF_TRIGGER_RISING | IRQF_ONESHOT,
 620                                         dcdc->name, dcdc);
 621         if (ret != 0) {
 622                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
 623                         irq, ret);
 624                 goto err;
 625         }
 626
 627         platform_set_drvdata(pdev, dcdc);
 628
 629         return 0;
 630
 631 err:
 632         return ret;
 633 }
 634
 635 static struct platform_driver wm831x_buckp_driver = {
 636         .probe = wm831x_buckp_probe,
 637         .driver         = {
 638                 .name   = "wm831x-buckp",
 639         },
 640 };
 641
 642 /*
 643  * DCDC boost convertors
 644  */
 645
 646 static int wm831x_boostp_get_status(struct regulator_dev *rdev)
 647 {
 648         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 649         struct wm831x *wm831x = dcdc->wm831x;
 650         int ret;
 651
 652         /* First, check for errors */
 653         ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
 654         if (ret < 0)
 655                 return ret;
 656
 657         if (ret & (1 << rdev_get_id(rdev))) {
 658                 dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
 659                         rdev_get_id(rdev) + 1);
 660                 return REGULATOR_STATUS_ERROR;
 661         }
 662
 663         /* Is the regulator on? */
 664         ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
 665         if (ret < 0)
 666                 return ret;
 667         if (ret & (1 << rdev_get_id(rdev)))
 668                 return REGULATOR_STATUS_ON;
 669         else
 670                 return REGULATOR_STATUS_OFF;
 671 }
 672
 673 static const struct regulator_ops wm831x_boostp_ops = {
 674         .get_status = wm831x_boostp_get_status,
 675
 676         .is_enabled = regulator_is_enabled_regmap,
 677         .enable = regulator_enable_regmap,
 678         .disable = regulator_disable_regmap,
 679 };
 680
 681 static int wm831x_boostp_probe(struct platform_device *pdev)
 682 {
 683         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 684         struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
 685         struct regulator_config config = { };
 686         int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
 687         struct wm831x_dcdc *dcdc;
 688         struct resource *res;
 689         int ret, irq;
 690
 691         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
 692
 693         if (pdata == NULL || pdata->dcdc[id] == NULL)
 694                 return -ENODEV;
 695
 696         dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), GFP_KERNEL);
 697         if (!dcdc)
 698                 return -ENOMEM;
 699
 700         dcdc->wm831x = wm831x;
 701
 702         res = platform_get_resource(pdev, IORESOURCE_REG, 0);
 703         if (res == NULL) {
 704                 dev_err(&pdev->dev, "No REG resource\n");
 705                 return -EINVAL;
 706         }
 707         dcdc->base = res->start;
 708
 709         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
 710         dcdc->desc.name = dcdc->name;
 711         dcdc->desc.id = id;
 712         dcdc->desc.type = REGULATOR_VOLTAGE;
 713         dcdc->desc.ops = &wm831x_boostp_ops;
 714         dcdc->desc.owner = THIS_MODULE;
 715         dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
 716         dcdc->desc.enable_mask = 1 << id;
 717
 718         config.dev = pdev->dev.parent;
 719         if (pdata)
 720                 config.init_data = pdata->dcdc[id];
 721         config.driver_data = dcdc;
 722         config.regmap = wm831x->regmap;
 723
 724         dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc,
 725                                                   &config);
 726         if (IS_ERR(dcdc->regulator)) {
 727                 ret = PTR_ERR(dcdc->regulator);
 728                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
 729                         id + 1, ret);
 730                 return ret;
 731         }
 732
 733         irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
 734         ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
 735                                         wm831x_dcdc_uv_irq,
 736                                         IRQF_TRIGGER_RISING | IRQF_ONESHOT,
 737                                         dcdc->name,
 738                                         dcdc);
 739         if (ret != 0) {
 740                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
 741                         irq, ret);
 742                 return ret;
 743         }
 744
 745         platform_set_drvdata(pdev, dcdc);
 746
 747         return 0;
 748 }
 749
 750 static struct platform_driver wm831x_boostp_driver = {
 751         .probe = wm831x_boostp_probe,
 752         .driver         = {
 753                 .name   = "wm831x-boostp",
 754         },
 755 };
 756
 757 /*
 758  * External Power Enable
 759  *
 760  * These aren't actually DCDCs but look like them in hardware so share
 761  * code.
 762  */
 763
 764 #define WM831X_EPE_BASE 6
 765
 766 static const struct regulator_ops wm831x_epe_ops = {
 767         .is_enabled = regulator_is_enabled_regmap,
 768         .enable = regulator_enable_regmap,
 769         .disable = regulator_disable_regmap,
 770         .get_status = wm831x_dcdc_get_status,
 771 };
 772
 773 static int wm831x_epe_probe(struct platform_device *pdev)
 774 {
 775         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 776         struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
 777         struct regulator_config config = { };
 778         int id = pdev->id % ARRAY_SIZE(pdata->epe);
 779         struct wm831x_dcdc *dcdc;
 780         int ret;
 781
 782         dev_dbg(&pdev->dev, "Probing EPE%d\n", id + 1);
 783
 784         dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), GFP_KERNEL);
 785         if (!dcdc)
 786                 return -ENOMEM;
 787
 788         dcdc->wm831x = wm831x;
 789
 790         /* For current parts this is correct; probably need to revisit
 791          * in future.
 792          */
 793         snprintf(dcdc->name, sizeof(dcdc->name), "EPE%d", id + 1);
 794         dcdc->desc.name = dcdc->name;
 795         dcdc->desc.id = id + WM831X_EPE_BASE; /* Offset in DCDC registers */
 796         dcdc->desc.ops = &wm831x_epe_ops;
 797         dcdc->desc.type = REGULATOR_VOLTAGE;
 798         dcdc->desc.owner = THIS_MODULE;
 799         dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
 800         dcdc->desc.enable_mask = 1 << dcdc->desc.id;
 801
 802         config.dev = pdev->dev.parent;
 803         if (pdata)
 804                 config.init_data = pdata->epe[id];
 805         config.driver_data = dcdc;
 806         config.regmap = wm831x->regmap;
 807
 808         dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc,
 809                                                   &config);
 810         if (IS_ERR(dcdc->regulator)) {
 811                 ret = PTR_ERR(dcdc->regulator);
 812                 dev_err(wm831x->dev, "Failed to register EPE%d: %d\n",
 813                         id + 1, ret);
 814                 goto err;
 815         }
 816
 817         platform_set_drvdata(pdev, dcdc);
 818
 819         return 0;
 820
 821 err:
 822         return ret;
 823 }
 824
 825 static struct platform_driver wm831x_epe_driver = {
 826         .probe = wm831x_epe_probe,
 827         .driver         = {
 828                 .name   = "wm831x-epe",
 829         },
 830 };
 831
 832 static struct platform_driver * const drivers[] = {
 833         &wm831x_buckv_driver,
 834         &wm831x_buckp_driver,
 835         &wm831x_boostp_driver,
 836         &wm831x_epe_driver,
 837 };
 838
 839 static int __init wm831x_dcdc_init(void)
 840 {
 841         return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
 842 }
 843 subsys_initcall(wm831x_dcdc_init);
 844
 845 static void __exit wm831x_dcdc_exit(void)
 846 {
 847         platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
 848 }
 849 module_exit(wm831x_dcdc_exit);
 850
 851 /* Module information */
 852 MODULE_AUTHOR("Mark Brown");
 853 MODULE_DESCRIPTION("WM831x DC-DC convertor driver");
 854 MODULE_LICENSE("GPL");
 855 MODULE_ALIAS("platform:wm831x-buckv");
 856 MODULE_ALIAS("platform:wm831x-buckp");
 857 MODULE_ALIAS("platform:wm831x-boostp");
 858 MODULE_ALIAS("platform:wm831x-epe");