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_cache_only(wm8994->regmap, true);
 287         regcache_mark_dirty(wm8994->regmap);
 288
 289         wm8994->suspended = true;
 290
 291         ret = regulator_bulk_disable(wm8994->num_supplies,
 292                                      wm8994->supplies);
 293         if (ret != 0) {
 294                 dev_err(dev, "Failed to disable supplies: %d\n", ret);
 295                 return ret;
 296         }
 297
 298         return 0;
 299 }
 300
 301 static int wm8994_resume(struct device *dev)
 302 {
 303         struct wm8994 *wm8994 = dev_get_drvdata(dev);
 304         int ret;
 305
 306         /* We may have lied to the PM core about suspending */
 307         if (!wm8994->suspended)
 308                 return 0;
 309
 310         ret = regulator_bulk_enable(wm8994->num_supplies,
 311                                     wm8994->supplies);
 312         if (ret != 0) {
 313                 dev_err(dev, "Failed to enable supplies: %d\n", ret);
 314                 return ret;
 315         }
 316
 317         regcache_cache_only(wm8994->regmap, false);
 318         ret = regcache_sync(wm8994->regmap);
 319         if (ret != 0) {
 320                 dev_err(dev, "Failed to restore register map: %d\n", ret);
 321                 goto err_enable;
 322         }
 323
 324         /* Disable LDO pulldowns while the device is active */
 325         wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,
 326                         WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD,
 327                         0);
 328
 329         wm8994->suspended = false;
 330
 331         return 0;
 332
 333 err_enable:
 334         regulator_bulk_disable(wm8994->num_supplies, wm8994->supplies);
 335
 336         return ret;
 337 }
 338 #endif
 339
 340 #ifdef CONFIG_REGULATOR
 341 static int wm8994_ldo_in_use(struct wm8994_pdata *pdata, int ldo)
 342 {
 343         struct wm8994_ldo_pdata *ldo_pdata;
 344
 345         if (!pdata)
 346                 return 0;
 347
 348         ldo_pdata = &pdata->ldo[ldo];
 349
 350         if (!ldo_pdata->init_data)
 351                 return 0;
 352
 353         return ldo_pdata->init_data->num_consumer_supplies != 0;
 354 }
 355 #else
 356 static int wm8994_ldo_in_use(struct wm8994_pdata *pdata, int ldo)
 357 {
 358         return 0;
 359 }
 360 #endif
 361
 362 static const __devinitdata struct reg_default wm8994_revc_patch[] = {
 363         { 0x102, 0x3 },
 364         { 0x56, 0x3 },
 365         { 0x817, 0x0 },
 366         { 0x102, 0x0 },
 367 };
 368
 369 static const __devinitdata struct reg_default wm8958_reva_patch[] = {
 370         { 0x102, 0x3 },
 371         { 0xcb, 0x81 },
 372         { 0x817, 0x0 },
 373         { 0x102, 0x0 },
 374 };
 375
 376 static const __devinitdata struct reg_default wm1811_reva_patch[] = {
 377         { 0x102, 0x3 },
 378         { 0x56, 0x7 },
 379         { 0x5d, 0x7e },
 380         { 0x5e, 0x0 },
 381         { 0x102, 0x0 },
 382 };
 383
 384 /*
 385  * Instantiate the generic non-control parts of the device.
 386  */
 387 static __devinit int wm8994_device_init(struct wm8994 *wm8994, int irq)
 388 {
 389         struct wm8994_pdata *pdata = wm8994->dev->platform_data;
 390         struct regmap_config *regmap_config;
 391         const struct reg_default *regmap_patch = NULL;
 392         const char *devname;
 393         int ret, i, patch_regs;
 394         int pulls = 0;
 395
 396         dev_set_drvdata(wm8994->dev, wm8994);
 397
 398         /* Add the on-chip regulators first for bootstrapping */
 399         ret = mfd_add_devices(wm8994->dev, -1,
 400                               wm8994_regulator_devs,
 401                               ARRAY_SIZE(wm8994_regulator_devs),
 402                               NULL, 0);
 403         if (ret != 0) {
 404                 dev_err(wm8994->dev, "Failed to add children: %d\n", ret);
 405                 goto err;
 406         }
 407
 408         switch (wm8994->type) {
 409         case WM1811:
 410                 wm8994->num_supplies = ARRAY_SIZE(wm1811_main_supplies);
 411                 break;
 412         case WM8994:
 413                 wm8994->num_supplies = ARRAY_SIZE(wm8994_main_supplies);
 414                 break;
 415         case WM8958:
 416                 wm8994->num_supplies = ARRAY_SIZE(wm8958_main_supplies);
 417                 break;
 418         default:
 419                 BUG();
 420                 goto err;
 421         }
 422
 423         wm8994->supplies = devm_kzalloc(wm8994->dev,
 424                                         sizeof(struct regulator_bulk_data) *
 425                                         wm8994->num_supplies, GFP_KERNEL);
 426         if (!wm8994->supplies) {
 427                 ret = -ENOMEM;
 428                 goto err;
 429         }
 430
 431         switch (wm8994->type) {
 432         case WM1811:
 433                 for (i = 0; i < ARRAY_SIZE(wm1811_main_supplies); i++)
 434                         wm8994->supplies[i].supply = wm1811_main_supplies[i];
 435                 break;
 436         case WM8994:
 437                 for (i = 0; i < ARRAY_SIZE(wm8994_main_supplies); i++)
 438                         wm8994->supplies[i].supply = wm8994_main_supplies[i];
 439                 break;
 440         case WM8958:
 441                 for (i = 0; i < ARRAY_SIZE(wm8958_main_supplies); i++)
 442                         wm8994->supplies[i].supply = wm8958_main_supplies[i];
 443                 break;
 444         default:
 445                 BUG();
 446                 goto err;
 447         }
 448
 449         ret = regulator_bulk_get(wm8994->dev, wm8994->num_supplies,
 450                                  wm8994->supplies);
 451         if (ret != 0) {
 452                 dev_err(wm8994->dev, "Failed to get supplies: %d\n", ret);
 453                 goto err;
 454         }
 455
 456         ret = regulator_bulk_enable(wm8994->num_supplies,
 457                                     wm8994->supplies);
 458         if (ret != 0) {
 459                 dev_err(wm8994->dev, "Failed to enable supplies: %d\n", ret);
 460                 goto err_get;
 461         }
 462
 463         ret = wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET);
 464         if (ret < 0) {
 465                 dev_err(wm8994->dev, "Failed to read ID register\n");
 466                 goto err_enable;
 467         }
 468         switch (ret) {
 469         case 0x1811:
 470                 devname = "WM1811";
 471                 if (wm8994->type != WM1811)
 472                         dev_warn(wm8994->dev, "Device registered as type %d\n",
 473                                  wm8994->type);
 474                 wm8994->type = WM1811;
 475                 break;
 476         case 0x8994:
 477                 devname = "WM8994";
 478                 if (wm8994->type != WM8994)
 479                         dev_warn(wm8994->dev, "Device registered as type %d\n",
 480                                  wm8994->type);
 481                 wm8994->type = WM8994;
 482                 break;
 483         case 0x8958:
 484                 devname = "WM8958";
 485                 if (wm8994->type != WM8958)
 486                         dev_warn(wm8994->dev, "Device registered as type %d\n",
 487                                  wm8994->type);
 488                 wm8994->type = WM8958;
 489                 break;
 490         default:
 491                 dev_err(wm8994->dev, "Device is not a WM8994, ID is %x\n",
 492                         ret);
 493                 ret = -EINVAL;
 494                 goto err_enable;
 495         }
 496
 497         ret = wm8994_reg_read(wm8994, WM8994_CHIP_REVISION);
 498         if (ret < 0) {
 499                 dev_err(wm8994->dev, "Failed to read revision register: %d\n",
 500                         ret);
 501                 goto err_enable;
 502         }
 503         wm8994->revision = ret;
 504
 505         switch (wm8994->type) {
 506         case WM8994:
 507                 switch (wm8994->revision) {
 508                 case 0:
 509                 case 1:
 510                         dev_warn(wm8994->dev,
 511                                  "revision %c not fully supported\n",
 512                                  'A' + wm8994->revision);
 513                         break;
 514                 case 2:
 515                 case 3:
 516                         regmap_patch = wm8994_revc_patch;
 517                         patch_regs = ARRAY_SIZE(wm8994_revc_patch);
 518                         break;
 519                 default:
 520                         break;
 521                 }
 522                 break;
 523
 524         case WM8958:
 525                 switch (wm8994->revision) {
 526                 case 0:
 527                         regmap_patch = wm8958_reva_patch;
 528                         patch_regs = ARRAY_SIZE(wm8958_reva_patch);
 529                         break;
 530                 default:
 531                         break;
 532                 }
 533                 break;
 534
 535         case WM1811:
 536                 /* Revision C did not change the relevant layer */
 537                 if (wm8994->revision > 1)
 538                         wm8994->revision++;
 539                 switch (wm8994->revision) {
 540                 case 0:
 541                 case 1:
 542                 case 2:
 543                 case 3:
 544                         regmap_patch = wm1811_reva_patch;
 545                         patch_regs = ARRAY_SIZE(wm1811_reva_patch);
 546                         break;
 547                 default:
 548                         break;
 549                 }
 550                 break;
 551
 552         default:
 553                 break;
 554         }
 555
 556         dev_info(wm8994->dev, "%s revision %c\n", devname,
 557                  'A' + wm8994->revision);
 558
 559         switch (wm8994->type) {
 560         case WM1811:
 561                 regmap_config = &wm1811_regmap_config;
 562                 break;
 563         case WM8994:
 564                 regmap_config = &wm8994_regmap_config;
 565                 break;
 566         case WM8958:
 567                 regmap_config = &wm8958_regmap_config;
 568                 break;
 569         default:
 570                 dev_err(wm8994->dev, "Unknown device type %d\n", wm8994->type);
 571                 return -EINVAL;
 572         }
 573
 574         ret = regmap_reinit_cache(wm8994->regmap, regmap_config);
 575         if (ret != 0) {
 576                 dev_err(wm8994->dev, "Failed to reinit register cache: %d\n",
 577                         ret);
 578                 return ret;
 579         }
 580
 581         if (regmap_patch) {
 582                 ret = regmap_register_patch(wm8994->regmap, regmap_patch,
 583                                             patch_regs);
 584                 if (ret != 0) {
 585                         dev_err(wm8994->dev, "Failed to register patch: %d\n",
 586                                 ret);
 587                         goto err;
 588                 }
 589         }
 590
 591         if (pdata) {
 592                 wm8994->irq_base = pdata->irq_base;
 593                 wm8994->gpio_base = pdata->gpio_base;
 594
 595                 /* GPIO configuration is only applied if it's non-zero */
 596                 for (i = 0; i < ARRAY_SIZE(pdata->gpio_defaults); i++) {
 597                         if (pdata->gpio_defaults[i]) {
 598                                 wm8994_set_bits(wm8994, WM8994_GPIO_1 + i,
 599                                                 0xffff,
 600                                                 pdata->gpio_defaults[i]);
 601                         }
 602                 }
 603
 604                 wm8994->ldo_ena_always_driven = pdata->ldo_ena_always_driven;
 605
 606                 if (pdata->spkmode_pu)
 607                         pulls |= WM8994_SPKMODE_PU;
 608         }
 609
 610         /* Disable unneeded pulls */
 611         wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,
 612                         WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD |
 613                         WM8994_SPKMODE_PU | WM8994_CSNADDR_PD,
 614                         pulls);
 615
 616         /* In some system designs where the regulators are not in use,
 617          * we can achieve a small reduction in leakage currents by
 618          * floating LDO outputs.  This bit makes no difference if the
 619          * LDOs are enabled, it only affects cases where the LDOs were
 620          * in operation and are then disabled.
 621          */
 622         for (i = 0; i < WM8994_NUM_LDO_REGS; i++) {
 623                 if (wm8994_ldo_in_use(pdata, i))
 624                         wm8994_set_bits(wm8994, WM8994_LDO_1 + i,
 625                                         WM8994_LDO1_DISCH, WM8994_LDO1_DISCH);
 626                 else
 627                         wm8994_set_bits(wm8994, WM8994_LDO_1 + i,
 628                                         WM8994_LDO1_DISCH, 0);
 629         }
 630
 631         wm8994_irq_init(wm8994);
 632
 633         ret = mfd_add_devices(wm8994->dev, -1,
 634                               wm8994_devs, ARRAY_SIZE(wm8994_devs),
 635                               NULL, 0);
 636         if (ret != 0) {
 637                 dev_err(wm8994->dev, "Failed to add children: %d\n", ret);
 638                 goto err_irq;
 639         }
 640
 641         pm_runtime_enable(wm8994->dev);
 642         pm_runtime_idle(wm8994->dev);
 643
 644         return 0;
 645
 646 err_irq:
 647         wm8994_irq_exit(wm8994);
 648 err_enable:
 649         regulator_bulk_disable(wm8994->num_supplies,
 650                                wm8994->supplies);
 651 err_get:
 652         regulator_bulk_free(wm8994->num_supplies, wm8994->supplies);
 653 err:
 654         mfd_remove_devices(wm8994->dev);
 655         return ret;
 656 }
 657
 658 static __devexit void wm8994_device_exit(struct wm8994 *wm8994)
 659 {
 660         pm_runtime_disable(wm8994->dev);
 661         mfd_remove_devices(wm8994->dev);
 662         wm8994_irq_exit(wm8994);
 663         regulator_bulk_disable(wm8994->num_supplies,
 664                                wm8994->supplies);
 665         regulator_bulk_free(wm8994->num_supplies, wm8994->supplies);
 666 }
 667
 668 static const struct of_device_id wm8994_of_match[] = {
 669         { .compatible = "wlf,wm1811", },
 670         { .compatible = "wlf,wm8994", },
 671         { .compatible = "wlf,wm8958", },
 672         { }
 673 };
 674 MODULE_DEVICE_TABLE(of, wm8994_of_match);
 675
 676 static __devinit int wm8994_i2c_probe(struct i2c_client *i2c,
 677                                       const struct i2c_device_id *id)
 678 {
 679         struct wm8994 *wm8994;
 680         int ret;
 681
 682         wm8994 = devm_kzalloc(&i2c->dev, sizeof(struct wm8994), GFP_KERNEL);
 683         if (wm8994 == NULL)
 684                 return -ENOMEM;
 685
 686         i2c_set_clientdata(i2c, wm8994);
 687         wm8994->dev = &i2c->dev;
 688         wm8994->irq = i2c->irq;
 689         wm8994->type = id->driver_data;
 690
 691         wm8994->regmap = devm_regmap_init_i2c(i2c, &wm8994_base_regmap_config);
 692         if (IS_ERR(wm8994->regmap)) {
 693                 ret = PTR_ERR(wm8994->regmap);
 694                 dev_err(wm8994->dev, "Failed to allocate register map: %d\n",
 695                         ret);
 696                 return ret;
 697         }
 698
 699         return wm8994_device_init(wm8994, i2c->irq);
 700 }
 701
 702 static __devexit int wm8994_i2c_remove(struct i2c_client *i2c)
 703 {
 704         struct wm8994 *wm8994 = i2c_get_clientdata(i2c);
 705
 706         wm8994_device_exit(wm8994);
 707
 708         return 0;
 709 }
 710
 711 static const struct i2c_device_id wm8994_i2c_id[] = {
 712         { "wm1811", WM1811 },
 713         { "wm1811a", WM1811 },
 714         { "wm8994", WM8994 },
 715         { "wm8958", WM8958 },
 716         { }
 717 };
 718 MODULE_DEVICE_TABLE(i2c, wm8994_i2c_id);
 719
 720 static UNIVERSAL_DEV_PM_OPS(wm8994_pm_ops, wm8994_suspend, wm8994_resume,
 721                             NULL);
 722
 723 static struct i2c_driver wm8994_i2c_driver = {
 724         .driver = {
 725                 .name = "wm8994",
 726                 .owner = THIS_MODULE,
 727                 .pm = &wm8994_pm_ops,
 728                 .of_match_table = wm8994_of_match,
 729         },
 730         .probe = wm8994_i2c_probe,
 731         .remove = __devexit_p(wm8994_i2c_remove),
 732         .id_table = wm8994_i2c_id,
 733 };
 734
 735 static int __init wm8994_i2c_init(void)
 736 {
 737         int ret;
 738
 739         ret = i2c_add_driver(&wm8994_i2c_driver);
 740         if (ret != 0)
 741                 pr_err("Failed to register wm8994 I2C driver: %d\n", ret);
 742
 743         return ret;
 744 }
 745 module_init(wm8994_i2c_init);
 746
 747 static void __exit wm8994_i2c_exit(void)
 748 {
 749         i2c_del_driver(&wm8994_i2c_driver);
 750 }
 751 module_exit(wm8994_i2c_exit);
 752
 753 MODULE_DESCRIPTION("Core support for the WM8994 audio CODEC");
 754 MODULE_LICENSE("GPL");
 755 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");