linux/drivers/mfd/wm8994-core.c
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   1/*
   2 * wm8994-core.c  --  Device access for Wolfson WM8994
   3 *
   4 * Copyright 2009 Wolfson Microelectronics PLC.
   5 *
   6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
   7 *
   8 *  This program is free software; you can redistribute  it and/or modify it
   9 *  under  the terms of  the GNU General  Public License as published by the
  10 *  Free Software Foundation;  either version 2 of the  License, or (at your
  11 *  option) any later version.
  12 *
  13 */
  14
  15#include <linux/kernel.h>
  16#include <linux/module.h>
  17#include <linux/slab.h>
  18#include <linux/i2c.h>
  19#include <linux/err.h>
  20#include <linux/delay.h>
  21#include <linux/mfd/core.h>
  22#include <linux/of.h>
  23#include <linux/of_device.h>
  24#include <linux/of_gpio.h>
  25#include <linux/pm_runtime.h>
  26#include <linux/regmap.h>
  27#include <linux/regulator/consumer.h>
  28#include <linux/regulator/machine.h>
  29
  30#include <linux/mfd/wm8994/core.h>
  31#include <linux/mfd/wm8994/pdata.h>
  32#include <linux/mfd/wm8994/registers.h>
  33
  34#include "wm8994.h"
  35
  36/**
  37 * wm8994_reg_read: Read a single WM8994 register.
  38 *
  39 * @wm8994: Device to read from.
  40 * @reg: Register to read.
  41 */
  42int wm8994_reg_read(struct wm8994 *wm8994, unsigned short reg)
  43{
  44        unsigned int val;
  45        int ret;
  46
  47        ret = regmap_read(wm8994->regmap, reg, &val);
  48
  49        if (ret < 0)
  50                return ret;
  51        else
  52                return val;
  53}
  54EXPORT_SYMBOL_GPL(wm8994_reg_read);
  55
  56/**
  57 * wm8994_bulk_read: Read multiple WM8994 registers
  58 *
  59 * @wm8994: Device to read from
  60 * @reg: First register
  61 * @count: Number of registers
  62 * @buf: Buffer to fill.  The data will be returned big endian.
  63 */
  64int wm8994_bulk_read(struct wm8994 *wm8994, unsigned short reg,
  65                     int count, u16 *buf)
  66{
  67        return regmap_bulk_read(wm8994->regmap, reg, buf, count);
  68}
  69
  70/**
  71 * wm8994_reg_write: Write a single WM8994 register.
  72 *
  73 * @wm8994: Device to write to.
  74 * @reg: Register to write to.
  75 * @val: Value to write.
  76 */
  77int wm8994_reg_write(struct wm8994 *wm8994, unsigned short reg,
  78                     unsigned short val)
  79{
  80        return regmap_write(wm8994->regmap, reg, val);
  81}
  82EXPORT_SYMBOL_GPL(wm8994_reg_write);
  83
  84/**
  85 * wm8994_bulk_write: Write multiple WM8994 registers
  86 *
  87 * @wm8994: Device to write to
  88 * @reg: First register
  89 * @count: Number of registers
  90 * @buf: Buffer to write from.  Data must be big-endian formatted.
  91 */
  92int wm8994_bulk_write(struct wm8994 *wm8994, unsigned short reg,
  93                      int count, const u16 *buf)
  94{
  95        return regmap_raw_write(wm8994->regmap, reg, buf, count * sizeof(u16));
  96}
  97EXPORT_SYMBOL_GPL(wm8994_bulk_write);
  98
  99/**
 100 * wm8994_set_bits: Set the value of a bitfield in a WM8994 register
 101 *
 102 * @wm8994: Device to write to.
 103 * @reg: Register to write to.
 104 * @mask: Mask of bits to set.
 105 * @val: Value to set (unshifted)
 106 */
 107int wm8994_set_bits(struct wm8994 *wm8994, unsigned short reg,
 108                    unsigned short mask, unsigned short val)
 109{
 110        return regmap_update_bits(wm8994->regmap, reg, mask, val);
 111}
 112EXPORT_SYMBOL_GPL(wm8994_set_bits);
 113
 114static struct mfd_cell wm8994_regulator_devs[] = {
 115        {
 116                .name = "wm8994-ldo",
 117                .id = 1,
 118                .pm_runtime_no_callbacks = true,
 119        },
 120        {
 121                .name = "wm8994-ldo",
 122                .id = 2,
 123                .pm_runtime_no_callbacks = true,
 124        },
 125};
 126
 127static struct resource wm8994_codec_resources[] = {
 128        {
 129                .start = WM8994_IRQ_TEMP_SHUT,
 130                .end   = WM8994_IRQ_TEMP_WARN,
 131                .flags = IORESOURCE_IRQ,
 132        },
 133};
 134
 135static struct resource wm8994_gpio_resources[] = {
 136        {
 137                .start = WM8994_IRQ_GPIO(1),
 138                .end   = WM8994_IRQ_GPIO(11),
 139                .flags = IORESOURCE_IRQ,
 140        },
 141};
 142
 143static struct mfd_cell wm8994_devs[] = {
 144        {
 145                .name = "wm8994-codec",
 146                .num_resources = ARRAY_SIZE(wm8994_codec_resources),
 147                .resources = wm8994_codec_resources,
 148        },
 149
 150        {
 151                .name = "wm8994-gpio",
 152                .num_resources = ARRAY_SIZE(wm8994_gpio_resources),
 153                .resources = wm8994_gpio_resources,
 154                .pm_runtime_no_callbacks = true,
 155        },
 156};
 157
 158/*
 159 * Supplies for the main bulk of CODEC; the LDO supplies are ignored
 160 * and should be handled via the standard regulator API supply
 161 * management.
 162 */
 163static const char *wm1811_main_supplies[] = {
 164        "DBVDD1",
 165        "DBVDD2",
 166        "DBVDD3",
 167        "DCVDD",
 168        "AVDD1",
 169        "AVDD2",
 170        "CPVDD",
 171        "SPKVDD1",
 172        "SPKVDD2",
 173};
 174
 175static const char *wm8994_main_supplies[] = {
 176        "DBVDD",
 177        "DCVDD",
 178        "AVDD1",
 179        "AVDD2",
 180        "CPVDD",
 181        "SPKVDD1",
 182        "SPKVDD2",
 183};
 184
 185static const char *wm8958_main_supplies[] = {
 186        "DBVDD1",
 187        "DBVDD2",
 188        "DBVDD3",
 189        "DCVDD",
 190        "AVDD1",
 191        "AVDD2",
 192        "CPVDD",
 193        "SPKVDD1",
 194        "SPKVDD2",
 195};
 196
 197#ifdef CONFIG_PM_RUNTIME
 198static int wm8994_suspend(struct device *dev)
 199{
 200        struct wm8994 *wm8994 = dev_get_drvdata(dev);
 201        int ret;
 202
 203        /* Don't actually go through with the suspend if the CODEC is
 204         * still active (eg, for audio passthrough from CP. */
 205        ret = wm8994_reg_read(wm8994, WM8994_POWER_MANAGEMENT_1);
 206        if (ret < 0) {
 207                dev_err(dev, "Failed to read power status: %d\n", ret);
 208        } else if (ret & WM8994_VMID_SEL_MASK) {
 209                dev_dbg(dev, "CODEC still active, ignoring suspend\n");
 210                return 0;
 211        }
 212
 213        ret = wm8994_reg_read(wm8994, WM8994_POWER_MANAGEMENT_4);
 214        if (ret < 0) {
 215                dev_err(dev, "Failed to read power status: %d\n", ret);
 216        } else if (ret & (WM8994_AIF2ADCL_ENA | WM8994_AIF2ADCR_ENA |
 217                          WM8994_AIF1ADC2L_ENA | WM8994_AIF1ADC2R_ENA |
 218                          WM8994_AIF1ADC1L_ENA | WM8994_AIF1ADC1R_ENA)) {
 219                dev_dbg(dev, "CODEC still active, ignoring suspend\n");
 220                return 0;
 221        }
 222
 223        ret = wm8994_reg_read(wm8994, WM8994_POWER_MANAGEMENT_5);
 224        if (ret < 0) {
 225                dev_err(dev, "Failed to read power status: %d\n", ret);
 226        } else if (ret & (WM8994_AIF2DACL_ENA | WM8994_AIF2DACR_ENA |
 227                          WM8994_AIF1DAC2L_ENA | WM8994_AIF1DAC2R_ENA |
 228                          WM8994_AIF1DAC1L_ENA | WM8994_AIF1DAC1R_ENA)) {
 229                dev_dbg(dev, "CODEC still active, ignoring suspend\n");
 230                return 0;
 231        }
 232
 233        switch (wm8994->type) {
 234        case WM8958:
 235        case WM1811:
 236                ret = wm8994_reg_read(wm8994, WM8958_MIC_DETECT_1);
 237                if (ret < 0) {
 238                        dev_err(dev, "Failed to read power status: %d\n", ret);
 239                } else if (ret & WM8958_MICD_ENA) {
 240                        dev_dbg(dev, "CODEC still active, ignoring suspend\n");
 241                        return 0;
 242                }
 243                break;
 244        default:
 245                break;
 246        }
 247
 248        switch (wm8994->type) {
 249        case WM1811:
 250                ret = wm8994_reg_read(wm8994, WM8994_ANTIPOP_2);
 251                if (ret < 0) {
 252                        dev_err(dev, "Failed to read jackdet: %d\n", ret);
 253                } else if (ret & WM1811_JACKDET_MODE_MASK) {
 254                        dev_dbg(dev, "CODEC still active, ignoring suspend\n");
 255                        return 0;
 256                }
 257                break;
 258        default:
 259                break;
 260        }
 261
 262        switch (wm8994->type) {
 263        case WM1811:
 264                ret = wm8994_reg_read(wm8994, WM8994_ANTIPOP_2);
 265                if (ret < 0) {
 266                        dev_err(dev, "Failed to read jackdet: %d\n", ret);
 267                } else if (ret & WM1811_JACKDET_MODE_MASK) {
 268                        dev_dbg(dev, "CODEC still active, ignoring suspend\n");
 269                        return 0;
 270                }
 271                break;
 272        default:
 273                break;
 274        }
 275
 276        /* Disable LDO pulldowns while the device is suspended if we
 277         * don't know that something will be driving them. */
 278        if (!wm8994->ldo_ena_always_driven)
 279                wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,
 280                                WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD,
 281                                WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD);
 282
 283        /* Explicitly put the device into reset in case regulators
 284         * don't get disabled in order to ensure consistent restart.
 285         */
 286        wm8994_reg_write(wm8994, WM8994_SOFTWARE_RESET,
 287                         wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET));
 288
 289        regcache_mark_dirty(wm8994->regmap);
 290
 291        /* Restore GPIO registers to prevent problems with mismatched
 292         * pin configurations.
 293         */
 294        ret = regcache_sync_region(wm8994->regmap, WM8994_GPIO_1,
 295                                   WM8994_GPIO_11);
 296        if (ret != 0)
 297                dev_err(dev, "Failed to restore GPIO registers: %d\n", ret);
 298
 299        /* In case one of the GPIOs is used as a wake input. */
 300        ret = regcache_sync_region(wm8994->regmap,
 301                                   WM8994_INTERRUPT_STATUS_1_MASK,
 302                                   WM8994_INTERRUPT_STATUS_1_MASK);
 303        if (ret != 0)
 304                dev_err(dev, "Failed to restore interrupt mask: %d\n", ret);
 305
 306        regcache_cache_only(wm8994->regmap, true);
 307        wm8994->suspended = true;
 308
 309        ret = regulator_bulk_disable(wm8994->num_supplies,
 310                                     wm8994->supplies);
 311        if (ret != 0) {
 312                dev_err(dev, "Failed to disable supplies: %d\n", ret);
 313                return ret;
 314        }
 315
 316        return 0;
 317}
 318
 319static int wm8994_resume(struct device *dev)
 320{
 321        struct wm8994 *wm8994 = dev_get_drvdata(dev);
 322        int ret;
 323
 324        /* We may have lied to the PM core about suspending */
 325        if (!wm8994->suspended)
 326                return 0;
 327
 328        ret = regulator_bulk_enable(wm8994->num_supplies,
 329                                    wm8994->supplies);
 330        if (ret != 0) {
 331                dev_err(dev, "Failed to enable supplies: %d\n", ret);
 332                return ret;
 333        }
 334
 335        regcache_cache_only(wm8994->regmap, false);
 336        ret = regcache_sync(wm8994->regmap);
 337        if (ret != 0) {
 338                dev_err(dev, "Failed to restore register map: %d\n", ret);
 339                goto err_enable;
 340        }
 341
 342        /* Disable LDO pulldowns while the device is active */
 343        wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,
 344                        WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD,
 345                        0);
 346
 347        wm8994->suspended = false;
 348
 349        return 0;
 350
 351err_enable:
 352        regulator_bulk_disable(wm8994->num_supplies, wm8994->supplies);
 353
 354        return ret;
 355}
 356#endif
 357
 358#ifdef CONFIG_REGULATOR
 359static int wm8994_ldo_in_use(struct wm8994_pdata *pdata, int ldo)
 360{
 361        struct wm8994_ldo_pdata *ldo_pdata;
 362
 363        if (!pdata)
 364                return 0;
 365
 366        ldo_pdata = &pdata->ldo[ldo];
 367
 368        if (!ldo_pdata->init_data)
 369                return 0;
 370
 371        return ldo_pdata->init_data->num_consumer_supplies != 0;
 372}
 373#else
 374static int wm8994_ldo_in_use(struct wm8994_pdata *pdata, int ldo)
 375{
 376        return 0;
 377}
 378#endif
 379
 380static const struct reg_default wm8994_revc_patch[] = {
 381        { 0x102, 0x3 },
 382        { 0x56, 0x3 },
 383        { 0x817, 0x0 },
 384        { 0x102, 0x0 },
 385};
 386
 387static const struct reg_default wm8958_reva_patch[] = {
 388        { 0x102, 0x3 },
 389        { 0xcb, 0x81 },
 390        { 0x817, 0x0 },
 391        { 0x102, 0x0 },
 392};
 393
 394static const struct reg_default wm1811_reva_patch[] = {
 395        { 0x102, 0x3 },
 396        { 0x56, 0xc07 },
 397        { 0x5d, 0x7e },
 398        { 0x5e, 0x0 },
 399        { 0x102, 0x0 },
 400};
 401
 402#ifdef CONFIG_OF
 403static int wm8994_set_pdata_from_of(struct wm8994 *wm8994)
 404{
 405        struct device_node *np = wm8994->dev->of_node;
 406        struct wm8994_pdata *pdata = &wm8994->pdata;
 407        int i;
 408
 409        if (!np)
 410                return 0;
 411
 412        if (of_property_read_u32_array(np, "wlf,gpio-cfg", pdata->gpio_defaults,
 413                                       ARRAY_SIZE(pdata->gpio_defaults)) >= 0) {
 414                for (i = 0; i < ARRAY_SIZE(pdata->gpio_defaults); i++) {
 415                        if (wm8994->pdata.gpio_defaults[i] == 0)
 416                                pdata->gpio_defaults[i]
 417                                        = WM8994_CONFIGURE_GPIO;
 418                }
 419        }
 420
 421        of_property_read_u32_array(np, "wlf,micbias-cfg", pdata->micbias,
 422                                   ARRAY_SIZE(pdata->micbias));
 423
 424        pdata->lineout1_diff = true;
 425        pdata->lineout2_diff = true;
 426        if (of_find_property(np, "wlf,lineout1-se", NULL))
 427                pdata->lineout1_diff = false;
 428        if (of_find_property(np, "wlf,lineout2-se", NULL))
 429                pdata->lineout2_diff = false;
 430
 431        if (of_find_property(np, "wlf,lineout1-feedback", NULL))
 432                pdata->lineout1fb = true;
 433        if (of_find_property(np, "wlf,lineout2-feedback", NULL))
 434                pdata->lineout2fb = true;
 435
 436        if (of_find_property(np, "wlf,ldoena-always-driven", NULL))
 437                pdata->lineout2fb = true;
 438
 439        pdata->ldo[0].enable = of_get_named_gpio(np, "wlf,ldo1ena", 0);
 440        if (pdata->ldo[0].enable < 0)
 441                pdata->ldo[0].enable = 0;
 442
 443        pdata->ldo[1].enable = of_get_named_gpio(np, "wlf,ldo2ena", 0);
 444        if (pdata->ldo[1].enable < 0)
 445                pdata->ldo[1].enable = 0;
 446
 447        return 0;
 448}
 449#else
 450static int wm8994_set_pdata_from_of(struct wm8994 *wm8994)
 451{
 452        return 0;
 453}
 454#endif
 455
 456/*
 457 * Instantiate the generic non-control parts of the device.
 458 */
 459static int wm8994_device_init(struct wm8994 *wm8994, int irq)
 460{
 461        struct wm8994_pdata *pdata;
 462        struct regmap_config *regmap_config;
 463        const struct reg_default *regmap_patch = NULL;
 464        const char *devname;
 465        int ret, i, patch_regs = 0;
 466        int pulls = 0;
 467
 468        if (dev_get_platdata(wm8994->dev)) {
 469                pdata = dev_get_platdata(wm8994->dev);
 470                wm8994->pdata = *pdata;
 471        }
 472        pdata = &wm8994->pdata;
 473
 474        ret = wm8994_set_pdata_from_of(wm8994);
 475        if (ret != 0)
 476                return ret;
 477
 478        dev_set_drvdata(wm8994->dev, wm8994);
 479
 480        /* Add the on-chip regulators first for bootstrapping */
 481        ret = mfd_add_devices(wm8994->dev, -1,
 482                              wm8994_regulator_devs,
 483                              ARRAY_SIZE(wm8994_regulator_devs),
 484                              NULL, 0, NULL);
 485        if (ret != 0) {
 486                dev_err(wm8994->dev, "Failed to add children: %d\n", ret);
 487                goto err;
 488        }
 489
 490        switch (wm8994->type) {
 491        case WM1811:
 492                wm8994->num_supplies = ARRAY_SIZE(wm1811_main_supplies);
 493                break;
 494        case WM8994:
 495                wm8994->num_supplies = ARRAY_SIZE(wm8994_main_supplies);
 496                break;
 497        case WM8958:
 498                wm8994->num_supplies = ARRAY_SIZE(wm8958_main_supplies);
 499                break;
 500        default:
 501                BUG();
 502                goto err;
 503        }
 504
 505        wm8994->supplies = devm_kzalloc(wm8994->dev,
 506                                        sizeof(struct regulator_bulk_data) *
 507                                        wm8994->num_supplies, GFP_KERNEL);
 508        if (!wm8994->supplies) {
 509                ret = -ENOMEM;
 510                goto err;
 511        }
 512
 513        switch (wm8994->type) {
 514        case WM1811:
 515                for (i = 0; i < ARRAY_SIZE(wm1811_main_supplies); i++)
 516                        wm8994->supplies[i].supply = wm1811_main_supplies[i];
 517                break;
 518        case WM8994:
 519                for (i = 0; i < ARRAY_SIZE(wm8994_main_supplies); i++)
 520                        wm8994->supplies[i].supply = wm8994_main_supplies[i];
 521                break;
 522        case WM8958:
 523                for (i = 0; i < ARRAY_SIZE(wm8958_main_supplies); i++)
 524                        wm8994->supplies[i].supply = wm8958_main_supplies[i];
 525                break;
 526        default:
 527                BUG();
 528                goto err;
 529        }
 530                
 531        ret = devm_regulator_bulk_get(wm8994->dev, wm8994->num_supplies,
 532                                 wm8994->supplies);
 533        if (ret != 0) {
 534                dev_err(wm8994->dev, "Failed to get supplies: %d\n", ret);
 535                goto err;
 536        }
 537
 538        ret = regulator_bulk_enable(wm8994->num_supplies,
 539                                    wm8994->supplies);
 540        if (ret != 0) {
 541                dev_err(wm8994->dev, "Failed to enable supplies: %d\n", ret);
 542                goto err;
 543        }
 544
 545        ret = wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET);
 546        if (ret < 0) {
 547                dev_err(wm8994->dev, "Failed to read ID register\n");
 548                goto err_enable;
 549        }
 550        switch (ret) {
 551        case 0x1811:
 552                devname = "WM1811";
 553                if (wm8994->type != WM1811)
 554                        dev_warn(wm8994->dev, "Device registered as type %d\n",
 555                                 wm8994->type);
 556                wm8994->type = WM1811;
 557                break;
 558        case 0x8994:
 559                devname = "WM8994";
 560                if (wm8994->type != WM8994)
 561                        dev_warn(wm8994->dev, "Device registered as type %d\n",
 562                                 wm8994->type);
 563                wm8994->type = WM8994;
 564                break;
 565        case 0x8958:
 566                devname = "WM8958";
 567                if (wm8994->type != WM8958)
 568                        dev_warn(wm8994->dev, "Device registered as type %d\n",
 569                                 wm8994->type);
 570                wm8994->type = WM8958;
 571                break;
 572        default:
 573                dev_err(wm8994->dev, "Device is not a WM8994, ID is %x\n",
 574                        ret);
 575                ret = -EINVAL;
 576                goto err_enable;
 577        }
 578
 579        ret = wm8994_reg_read(wm8994, WM8994_CHIP_REVISION);
 580        if (ret < 0) {
 581                dev_err(wm8994->dev, "Failed to read revision register: %d\n",
 582                        ret);
 583                goto err_enable;
 584        }
 585        wm8994->revision = ret & WM8994_CHIP_REV_MASK;
 586        wm8994->cust_id = (ret & WM8994_CUST_ID_MASK) >> WM8994_CUST_ID_SHIFT;
 587
 588        switch (wm8994->type) {
 589        case WM8994:
 590                switch (wm8994->revision) {
 591                case 0:
 592                case 1:
 593                        dev_warn(wm8994->dev,
 594                                 "revision %c not fully supported\n",
 595                                 'A' + wm8994->revision);
 596                        break;
 597                case 2:
 598                case 3:
 599                default:
 600                        regmap_patch = wm8994_revc_patch;
 601                        patch_regs = ARRAY_SIZE(wm8994_revc_patch);
 602                        break;
 603                }
 604                break;
 605
 606        case WM8958:
 607                switch (wm8994->revision) {
 608                case 0:
 609                        regmap_patch = wm8958_reva_patch;
 610                        patch_regs = ARRAY_SIZE(wm8958_reva_patch);
 611                        break;
 612                default:
 613                        break;
 614                }
 615                break;
 616
 617        case WM1811:
 618                /* Revision C did not change the relevant layer */
 619                if (wm8994->revision > 1)
 620                        wm8994->revision++;
 621
 622                regmap_patch = wm1811_reva_patch;
 623                patch_regs = ARRAY_SIZE(wm1811_reva_patch);
 624                break;
 625
 626        default:
 627                break;
 628        }
 629
 630        dev_info(wm8994->dev, "%s revision %c CUST_ID %02x\n", devname,
 631                 'A' + wm8994->revision, wm8994->cust_id);
 632
 633        switch (wm8994->type) {
 634        case WM1811:
 635                regmap_config = &wm1811_regmap_config;
 636                break;
 637        case WM8994:
 638                regmap_config = &wm8994_regmap_config;
 639                break;
 640        case WM8958:
 641                regmap_config = &wm8958_regmap_config;
 642                break;
 643        default:
 644                dev_err(wm8994->dev, "Unknown device type %d\n", wm8994->type);
 645                return -EINVAL;
 646        }
 647
 648        ret = regmap_reinit_cache(wm8994->regmap, regmap_config);
 649        if (ret != 0) {
 650                dev_err(wm8994->dev, "Failed to reinit register cache: %d\n",
 651                        ret);
 652                return ret;
 653        }
 654
 655        if (regmap_patch) {
 656                ret = regmap_register_patch(wm8994->regmap, regmap_patch,
 657                                            patch_regs);
 658                if (ret != 0) {
 659                        dev_err(wm8994->dev, "Failed to register patch: %d\n",
 660                                ret);
 661                        goto err;
 662                }
 663        }
 664
 665        wm8994->irq_base = pdata->irq_base;
 666        wm8994->gpio_base = pdata->gpio_base;
 667
 668        /* GPIO configuration is only applied if it's non-zero */
 669        for (i = 0; i < ARRAY_SIZE(pdata->gpio_defaults); i++) {
 670                if (pdata->gpio_defaults[i]) {
 671                        wm8994_set_bits(wm8994, WM8994_GPIO_1 + i,
 672                                        0xffff, pdata->gpio_defaults[i]);
 673                }
 674        }
 675
 676        wm8994->ldo_ena_always_driven = pdata->ldo_ena_always_driven;
 677
 678        if (pdata->spkmode_pu)
 679                pulls |= WM8994_SPKMODE_PU;
 680
 681        /* Disable unneeded pulls */
 682        wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,
 683                        WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD |
 684                        WM8994_SPKMODE_PU | WM8994_CSNADDR_PD,
 685                        pulls);
 686
 687        /* In some system designs where the regulators are not in use,
 688         * we can achieve a small reduction in leakage currents by
 689         * floating LDO outputs.  This bit makes no difference if the
 690         * LDOs are enabled, it only affects cases where the LDOs were
 691         * in operation and are then disabled.
 692         */
 693        for (i = 0; i < WM8994_NUM_LDO_REGS; i++) {
 694                if (wm8994_ldo_in_use(pdata, i))
 695                        wm8994_set_bits(wm8994, WM8994_LDO_1 + i,
 696                                        WM8994_LDO1_DISCH, WM8994_LDO1_DISCH);
 697                else
 698                        wm8994_set_bits(wm8994, WM8994_LDO_1 + i,
 699                                        WM8994_LDO1_DISCH, 0);
 700        }
 701
 702        wm8994_irq_init(wm8994);
 703
 704        ret = mfd_add_devices(wm8994->dev, -1,
 705                              wm8994_devs, ARRAY_SIZE(wm8994_devs),
 706                              NULL, 0, NULL);
 707        if (ret != 0) {
 708                dev_err(wm8994->dev, "Failed to add children: %d\n", ret);
 709                goto err_irq;
 710        }
 711
 712        pm_runtime_enable(wm8994->dev);
 713        pm_runtime_idle(wm8994->dev);
 714
 715        return 0;
 716
 717err_irq:
 718        wm8994_irq_exit(wm8994);
 719err_enable:
 720        regulator_bulk_disable(wm8994->num_supplies,
 721                               wm8994->supplies);
 722err:
 723        mfd_remove_devices(wm8994->dev);
 724        return ret;
 725}
 726
 727static void wm8994_device_exit(struct wm8994 *wm8994)
 728{
 729        pm_runtime_disable(wm8994->dev);
 730        mfd_remove_devices(wm8994->dev);
 731        wm8994_irq_exit(wm8994);
 732        regulator_bulk_disable(wm8994->num_supplies,
 733                               wm8994->supplies);
 734}
 735
 736static const struct of_device_id wm8994_of_match[] = {
 737        { .compatible = "wlf,wm1811", .data = (void *)WM1811 },
 738        { .compatible = "wlf,wm8994", .data = (void *)WM8994 },
 739        { .compatible = "wlf,wm8958", .data = (void *)WM8958 },
 740        { }
 741};
 742MODULE_DEVICE_TABLE(of, wm8994_of_match);
 743
 744static int wm8994_i2c_probe(struct i2c_client *i2c,
 745                                      const struct i2c_device_id *id)
 746{
 747        const struct of_device_id *of_id;
 748        struct wm8994 *wm8994;
 749        int ret;
 750
 751        wm8994 = devm_kzalloc(&i2c->dev, sizeof(struct wm8994), GFP_KERNEL);
 752        if (wm8994 == NULL)
 753                return -ENOMEM;
 754
 755        i2c_set_clientdata(i2c, wm8994);
 756        wm8994->dev = &i2c->dev;
 757        wm8994->irq = i2c->irq;
 758
 759        if (i2c->dev.of_node) {
 760                of_id = of_match_device(wm8994_of_match, &i2c->dev);
 761                if (of_id)
 762                        wm8994->type = (int)of_id->data;
 763        } else {
 764                wm8994->type = id->driver_data;
 765        }
 766
 767        wm8994->regmap = devm_regmap_init_i2c(i2c, &wm8994_base_regmap_config);
 768        if (IS_ERR(wm8994->regmap)) {
 769                ret = PTR_ERR(wm8994->regmap);
 770                dev_err(wm8994->dev, "Failed to allocate register map: %d\n",
 771                        ret);
 772                return ret;
 773        }
 774
 775        return wm8994_device_init(wm8994, i2c->irq);
 776}
 777
 778static int wm8994_i2c_remove(struct i2c_client *i2c)
 779{
 780        struct wm8994 *wm8994 = i2c_get_clientdata(i2c);
 781
 782        wm8994_device_exit(wm8994);
 783
 784        return 0;
 785}
 786
 787static const struct i2c_device_id wm8994_i2c_id[] = {
 788        { "wm1811", WM1811 },
 789        { "wm1811a", WM1811 },
 790        { "wm8994", WM8994 },
 791        { "wm8958", WM8958 },
 792        { }
 793};
 794MODULE_DEVICE_TABLE(i2c, wm8994_i2c_id);
 795
 796static const struct dev_pm_ops wm8994_pm_ops = {
 797        SET_RUNTIME_PM_OPS(wm8994_suspend, wm8994_resume, NULL)
 798};
 799
 800static struct i2c_driver wm8994_i2c_driver = {
 801        .driver = {
 802                .name = "wm8994",
 803                .owner = THIS_MODULE,
 804                .pm = &wm8994_pm_ops,
 805                .of_match_table = of_match_ptr(wm8994_of_match),
 806        },
 807        .probe = wm8994_i2c_probe,
 808        .remove = wm8994_i2c_remove,
 809        .id_table = wm8994_i2c_id,
 810};
 811
 812module_i2c_driver(wm8994_i2c_driver);
 813
 814MODULE_DESCRIPTION("Core support for the WM8994 audio CODEC");
 815MODULE_LICENSE("GPL");
 816MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 817
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