drivers/mfd/wm8994-core.c

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