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