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         /* Disable LDO pulldowns while the device is suspended if we
 260          * don't know that something will be driving them. */
 261         if (!wm8994->ldo_ena_always_driven)
 262                 wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,
 263                                 WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD,
 264                                 WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD);
 265
 266         /* Explicitly put the device into reset in case regulators
 267          * don't get disabled in order to ensure consistent restart.
 268          */
 269         wm8994_reg_write(wm8994, WM8994_SOFTWARE_RESET,
 270                          wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET));
 271
 272         regcache_cache_only(wm8994->regmap, true);
 273         regcache_mark_dirty(wm8994->regmap);
 274
 275         wm8994->suspended = true;
 276
 277         ret = regulator_bulk_disable(wm8994->num_supplies,
 278                                      wm8994->supplies);
 279         if (ret != 0) {
 280                 dev_err(dev, "Failed to disable supplies: %d\n", ret);
 281                 return ret;
 282         }
 283
 284         return 0;
 285 }
 286
 287 static int wm8994_resume(struct device *dev)
 288 {
 289         struct wm8994 *wm8994 = dev_get_drvdata(dev);
 290         int ret;
 291
 292         /* We may have lied to the PM core about suspending */
 293         if (!wm8994->suspended)
 294                 return 0;
 295
 296         ret = regulator_bulk_enable(wm8994->num_supplies,
 297                                     wm8994->supplies);
 298         if (ret != 0) {
 299                 dev_err(dev, "Failed to enable supplies: %d\n", ret);
 300                 return ret;
 301         }
 302
 303         regcache_cache_only(wm8994->regmap, false);
 304         ret = regcache_sync(wm8994->regmap);
 305         if (ret != 0) {
 306                 dev_err(dev, "Failed to restore register map: %d\n", ret);
 307                 goto err_enable;
 308         }
 309
 310         /* Disable LDO pulldowns while the device is active */
 311         wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,
 312                         WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD,
 313                         0);
 314
 315         wm8994->suspended = false;
 316
 317         return 0;
 318
 319 err_enable:
 320         regulator_bulk_disable(wm8994->num_supplies, wm8994->supplies);
 321
 322         return ret;
 323 }
 324 #endif
 325
 326 #ifdef CONFIG_REGULATOR
 327 static int wm8994_ldo_in_use(struct wm8994_pdata *pdata, int ldo)
 328 {
 329         struct wm8994_ldo_pdata *ldo_pdata;
 330
 331         if (!pdata)
 332                 return 0;
 333
 334         ldo_pdata = &pdata->ldo[ldo];
 335
 336         if (!ldo_pdata->init_data)
 337                 return 0;
 338
 339         return ldo_pdata->init_data->num_consumer_supplies != 0;
 340 }
 341 #else
 342 static int wm8994_ldo_in_use(struct wm8994_pdata *pdata, int ldo)
 343 {
 344         return 0;
 345 }
 346 #endif
 347
 348 static const __devinitdata struct reg_default wm8994_revc_patch[] = {
 349         { 0x102, 0x3 },
 350         { 0x56, 0x3 },
 351         { 0x817, 0x0 },
 352         { 0x102, 0x0 },
 353 };
 354
 355 static const __devinitdata struct reg_default wm8958_reva_patch[] = {
 356         { 0x102, 0x3 },
 357         { 0xcb, 0x81 },
 358         { 0x817, 0x0 },
 359         { 0x102, 0x0 },
 360 };
 361
 362 static const __devinitdata struct reg_default wm1811_reva_patch[] = {
 363         { 0x102, 0x3 },
 364         { 0x56, 0x7 },
 365         { 0x5d, 0x7e },
 366         { 0x5e, 0x0 },
 367         { 0x102, 0x0 },
 368 };
 369
 370 /*
 371  * Instantiate the generic non-control parts of the device.
 372  */
 373 static __devinit int wm8994_device_init(struct wm8994 *wm8994, int irq)
 374 {
 375         struct wm8994_pdata *pdata = wm8994->dev->platform_data;
 376         struct regmap_config *regmap_config;
 377         const struct reg_default *regmap_patch = NULL;
 378         const char *devname;
 379         int ret, i, patch_regs;
 380         int pulls = 0;
 381
 382         dev_set_drvdata(wm8994->dev, wm8994);
 383
 384         /* Add the on-chip regulators first for bootstrapping */
 385         ret = mfd_add_devices(wm8994->dev, -1,
 386                               wm8994_regulator_devs,
 387                               ARRAY_SIZE(wm8994_regulator_devs),
 388                               NULL, 0);
 389         if (ret != 0) {
 390                 dev_err(wm8994->dev, "Failed to add children: %d\n", ret);
 391                 goto err;
 392         }
 393
 394         switch (wm8994->type) {
 395         case WM1811:
 396                 wm8994->num_supplies = ARRAY_SIZE(wm1811_main_supplies);
 397                 break;
 398         case WM8994:
 399                 wm8994->num_supplies = ARRAY_SIZE(wm8994_main_supplies);
 400                 break;
 401         case WM8958:
 402                 wm8994->num_supplies = ARRAY_SIZE(wm8958_main_supplies);
 403                 break;
 404         default:
 405                 BUG();
 406                 goto err;
 407         }
 408
 409         wm8994->supplies = devm_kzalloc(wm8994->dev,
 410                                         sizeof(struct regulator_bulk_data) *
 411                                         wm8994->num_supplies, GFP_KERNEL);
 412         if (!wm8994->supplies) {
 413                 ret = -ENOMEM;
 414                 goto err;
 415         }
 416
 417         switch (wm8994->type) {
 418         case WM1811:
 419                 for (i = 0; i < ARRAY_SIZE(wm1811_main_supplies); i++)
 420                         wm8994->supplies[i].supply = wm1811_main_supplies[i];
 421                 break;
 422         case WM8994:
 423                 for (i = 0; i < ARRAY_SIZE(wm8994_main_supplies); i++)
 424                         wm8994->supplies[i].supply = wm8994_main_supplies[i];
 425                 break;
 426         case WM8958:
 427                 for (i = 0; i < ARRAY_SIZE(wm8958_main_supplies); i++)
 428                         wm8994->supplies[i].supply = wm8958_main_supplies[i];
 429                 break;
 430         default:
 431                 BUG();
 432                 goto err;
 433         }
 434
 435         ret = regulator_bulk_get(wm8994->dev, wm8994->num_supplies,
 436                                  wm8994->supplies);
 437         if (ret != 0) {
 438                 dev_err(wm8994->dev, "Failed to get supplies: %d\n", ret);
 439                 goto err;
 440         }
 441
 442         ret = regulator_bulk_enable(wm8994->num_supplies,
 443                                     wm8994->supplies);
 444         if (ret != 0) {
 445                 dev_err(wm8994->dev, "Failed to enable supplies: %d\n", ret);
 446                 goto err_get;
 447         }
 448
 449         ret = wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET);
 450         if (ret < 0) {
 451                 dev_err(wm8994->dev, "Failed to read ID register\n");
 452                 goto err_enable;
 453         }
 454         switch (ret) {
 455         case 0x1811:
 456                 devname = "WM1811";
 457                 if (wm8994->type != WM1811)
 458                         dev_warn(wm8994->dev, "Device registered as type %d\n",
 459                                  wm8994->type);
 460                 wm8994->type = WM1811;
 461                 break;
 462         case 0x8994:
 463                 devname = "WM8994";
 464                 if (wm8994->type != WM8994)
 465                         dev_warn(wm8994->dev, "Device registered as type %d\n",
 466                                  wm8994->type);
 467                 wm8994->type = WM8994;
 468                 break;
 469         case 0x8958:
 470                 devname = "WM8958";
 471                 if (wm8994->type != WM8958)
 472                         dev_warn(wm8994->dev, "Device registered as type %d\n",
 473                                  wm8994->type);
 474                 wm8994->type = WM8958;
 475                 break;
 476         default:
 477                 dev_err(wm8994->dev, "Device is not a WM8994, ID is %x\n",
 478                         ret);
 479                 ret = -EINVAL;
 480                 goto err_enable;
 481         }
 482
 483         ret = wm8994_reg_read(wm8994, WM8994_CHIP_REVISION);
 484         if (ret < 0) {
 485                 dev_err(wm8994->dev, "Failed to read revision register: %d\n",
 486                         ret);
 487                 goto err_enable;
 488         }
 489         wm8994->revision = ret;
 490
 491         switch (wm8994->type) {
 492         case WM8994:
 493                 switch (wm8994->revision) {
 494                 case 0:
 495                 case 1:
 496                         dev_warn(wm8994->dev,
 497                                  "revision %c not fully supported\n",
 498                                  'A' + wm8994->revision);
 499                         break;
 500                 case 2:
 501                 case 3:
 502                         regmap_patch = wm8994_revc_patch;
 503                         patch_regs = ARRAY_SIZE(wm8994_revc_patch);
 504                         break;
 505                 default:
 506                         break;
 507                 }
 508                 break;
 509
 510         case WM8958:
 511                 switch (wm8994->revision) {
 512                 case 0:
 513                         regmap_patch = wm8958_reva_patch;
 514                         patch_regs = ARRAY_SIZE(wm8958_reva_patch);
 515                         break;
 516                 default:
 517                         break;
 518                 }
 519                 break;
 520
 521         case WM1811:
 522                 /* Revision C did not change the relevant layer */
 523                 if (wm8994->revision > 1)
 524                         wm8994->revision++;
 525                 switch (wm8994->revision) {
 526                 case 0:
 527                 case 1:
 528                 case 2:
 529                 case 3:
 530                         regmap_patch = wm1811_reva_patch;
 531                         patch_regs = ARRAY_SIZE(wm1811_reva_patch);
 532                         break;
 533                 default:
 534                         break;
 535                 }
 536                 break;
 537
 538         default:
 539                 break;
 540         }
 541
 542         dev_info(wm8994->dev, "%s revision %c\n", devname,
 543                  'A' + wm8994->revision);
 544
 545         switch (wm8994->type) {
 546         case WM1811:
 547                 regmap_config = &wm1811_regmap_config;
 548                 break;
 549         case WM8994:
 550                 regmap_config = &wm8994_regmap_config;
 551                 break;
 552         case WM8958:
 553                 regmap_config = &wm8958_regmap_config;
 554                 break;
 555         default:
 556                 dev_err(wm8994->dev, "Unknown device type %d\n", wm8994->type);
 557                 return -EINVAL;
 558         }
 559
 560         ret = regmap_reinit_cache(wm8994->regmap, regmap_config);
 561         if (ret != 0) {
 562                 dev_err(wm8994->dev, "Failed to reinit register cache: %d\n",
 563                         ret);
 564                 return ret;
 565         }
 566
 567         if (regmap_patch) {
 568                 ret = regmap_register_patch(wm8994->regmap, regmap_patch,
 569                                             patch_regs);
 570                 if (ret != 0) {
 571                         dev_err(wm8994->dev, "Failed to register patch: %d\n",
 572                                 ret);
 573                         goto err;
 574                 }
 575         }
 576
 577         if (pdata) {
 578                 wm8994->irq_base = pdata->irq_base;
 579                 wm8994->gpio_base = pdata->gpio_base;
 580
 581                 /* GPIO configuration is only applied if it's non-zero */
 582                 for (i = 0; i < ARRAY_SIZE(pdata->gpio_defaults); i++) {
 583                         if (pdata->gpio_defaults[i]) {
 584                                 wm8994_set_bits(wm8994, WM8994_GPIO_1 + i,
 585                                                 0xffff,
 586                                                 pdata->gpio_defaults[i]);
 587                         }
 588                 }
 589
 590                 wm8994->ldo_ena_always_driven = pdata->ldo_ena_always_driven;
 591
 592                 if (pdata->spkmode_pu)
 593                         pulls |= WM8994_SPKMODE_PU;
 594         }
 595
 596         /* Disable unneeded pulls */
 597         wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,
 598                         WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD |
 599                         WM8994_SPKMODE_PU | WM8994_CSNADDR_PD,
 600                         pulls);
 601
 602         /* In some system designs where the regulators are not in use,
 603          * we can achieve a small reduction in leakage currents by
 604          * floating LDO outputs.  This bit makes no difference if the
 605          * LDOs are enabled, it only affects cases where the LDOs were
 606          * in operation and are then disabled.
 607          */
 608         for (i = 0; i < WM8994_NUM_LDO_REGS; i++) {
 609                 if (wm8994_ldo_in_use(pdata, i))
 610                         wm8994_set_bits(wm8994, WM8994_LDO_1 + i,
 611                                         WM8994_LDO1_DISCH, WM8994_LDO1_DISCH);
 612                 else
 613                         wm8994_set_bits(wm8994, WM8994_LDO_1 + i,
 614                                         WM8994_LDO1_DISCH, 0);
 615         }
 616
 617         wm8994_irq_init(wm8994);
 618
 619         ret = mfd_add_devices(wm8994->dev, -1,
 620                               wm8994_devs, ARRAY_SIZE(wm8994_devs),
 621                               NULL, 0);
 622         if (ret != 0) {
 623                 dev_err(wm8994->dev, "Failed to add children: %d\n", ret);
 624                 goto err_irq;
 625         }
 626
 627         pm_runtime_enable(wm8994->dev);
 628         pm_runtime_resume(wm8994->dev);
 629
 630         return 0;
 631
 632 err_irq:
 633         wm8994_irq_exit(wm8994);
 634 err_enable:
 635         regulator_bulk_disable(wm8994->num_supplies,
 636                                wm8994->supplies);
 637 err_get:
 638         regulator_bulk_free(wm8994->num_supplies, wm8994->supplies);
 639 err:
 640         mfd_remove_devices(wm8994->dev);
 641         return ret;
 642 }
 643
 644 static __devexit void wm8994_device_exit(struct wm8994 *wm8994)
 645 {
 646         pm_runtime_disable(wm8994->dev);
 647         mfd_remove_devices(wm8994->dev);
 648         wm8994_irq_exit(wm8994);
 649         regulator_bulk_disable(wm8994->num_supplies,
 650                                wm8994->supplies);
 651         regulator_bulk_free(wm8994->num_supplies, wm8994->supplies);
 652 }
 653
 654 static const struct of_device_id wm8994_of_match[] = {
 655         { .compatible = "wlf,wm1811", },
 656         { .compatible = "wlf,wm8994", },
 657         { .compatible = "wlf,wm8958", },
 658         { }
 659 };
 660 MODULE_DEVICE_TABLE(of, wm8994_of_match);
 661
 662 static __devinit int wm8994_i2c_probe(struct i2c_client *i2c,
 663                                       const struct i2c_device_id *id)
 664 {
 665         struct wm8994 *wm8994;
 666         int ret;
 667
 668         wm8994 = devm_kzalloc(&i2c->dev, sizeof(struct wm8994), GFP_KERNEL);
 669         if (wm8994 == NULL)
 670                 return -ENOMEM;
 671
 672         i2c_set_clientdata(i2c, wm8994);
 673         wm8994->dev = &i2c->dev;
 674         wm8994->irq = i2c->irq;
 675         wm8994->type = id->driver_data;
 676
 677         wm8994->regmap = devm_regmap_init_i2c(i2c, &wm8994_base_regmap_config);
 678         if (IS_ERR(wm8994->regmap)) {
 679                 ret = PTR_ERR(wm8994->regmap);
 680                 dev_err(wm8994->dev, "Failed to allocate register map: %d\n",
 681                         ret);
 682                 return ret;
 683         }
 684
 685         return wm8994_device_init(wm8994, i2c->irq);
 686 }
 687
 688 static __devexit int wm8994_i2c_remove(struct i2c_client *i2c)
 689 {
 690         struct wm8994 *wm8994 = i2c_get_clientdata(i2c);
 691
 692         wm8994_device_exit(wm8994);
 693
 694         return 0;
 695 }
 696
 697 static const struct i2c_device_id wm8994_i2c_id[] = {
 698         { "wm1811", WM1811 },
 699         { "wm1811a", WM1811 },
 700         { "wm8994", WM8994 },
 701         { "wm8958", WM8958 },
 702         { }
 703 };
 704 MODULE_DEVICE_TABLE(i2c, wm8994_i2c_id);
 705
 706 static UNIVERSAL_DEV_PM_OPS(wm8994_pm_ops, wm8994_suspend, wm8994_resume,
 707                             NULL);
 708
 709 static struct i2c_driver wm8994_i2c_driver = {
 710         .driver = {
 711                 .name = "wm8994",
 712                 .owner = THIS_MODULE,
 713                 .pm = &wm8994_pm_ops,
 714                 .of_match_table = wm8994_of_match,
 715         },
 716         .probe = wm8994_i2c_probe,
 717         .remove = __devexit_p(wm8994_i2c_remove),
 718         .id_table = wm8994_i2c_id,
 719 };
 720
 721 static int __init wm8994_i2c_init(void)
 722 {
 723         int ret;
 724
 725         ret = i2c_add_driver(&wm8994_i2c_driver);
 726         if (ret != 0)
 727                 pr_err("Failed to register wm8994 I2C driver: %d\n", ret);
 728
 729         return ret;
 730 }
 731 module_init(wm8994_i2c_init);
 732
 733 static void __exit wm8994_i2c_exit(void)
 734 {
 735         i2c_del_driver(&wm8994_i2c_driver);
 736 }
 737 module_exit(wm8994_i2c_exit);
 738
 739 MODULE_DESCRIPTION("Core support for the WM8994 audio CODEC");
 740 MODULE_LICENSE("GPL");
 741 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");