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         switch (wm8994->type) {
 274         case WM1811:
 275                 ret = wm8994_reg_read(wm8994, WM8994_ANTIPOP_2);
 276                 if (ret < 0) {
 277                         dev_err(dev, "Failed to read jackdet: %d\n", ret);
 278                 } else if (ret & WM1811_JACKDET_MODE_MASK) {
 279                         dev_dbg(dev, "CODEC still active, ignoring suspend\n");
 280                         return 0;
 281                 }
 282                 break;
 283         default:
 284                 break;
 285         }
 286
 287         /* Disable LDO pulldowns while the device is suspended if we
 288          * don't know that something will be driving them. */
 289         if (!wm8994->ldo_ena_always_driven)
 290                 wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,
 291                                 WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD,
 292                                 WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD);
 293
 294         /* Explicitly put the device into reset in case regulators
 295          * don't get disabled in order to ensure consistent restart.
 296          */
 297         wm8994_reg_write(wm8994, WM8994_SOFTWARE_RESET,
 298                          wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET));
 299
 300         regcache_cache_only(wm8994->regmap, true);
 301         regcache_mark_dirty(wm8994->regmap);
 302
 303         wm8994->suspended = true;
 304
 305         ret = regulator_bulk_disable(wm8994->num_supplies,
 306                                      wm8994->supplies);
 307         if (ret != 0) {
 308                 dev_err(dev, "Failed to disable supplies: %d\n", ret);
 309                 return ret;
 310         }
 311
 312         return 0;
 313 }
 314
 315 static int wm8994_resume(struct device *dev)
 316 {
 317         struct wm8994 *wm8994 = dev_get_drvdata(dev);
 318         int ret;
 319
 320         /* We may have lied to the PM core about suspending */
 321         if (!wm8994->suspended)
 322                 return 0;
 323
 324         ret = regulator_bulk_enable(wm8994->num_supplies,
 325                                     wm8994->supplies);
 326         if (ret != 0) {
 327                 dev_err(dev, "Failed to enable supplies: %d\n", ret);
 328                 return ret;
 329         }
 330
 331         regcache_cache_only(wm8994->regmap, false);
 332         ret = regcache_sync(wm8994->regmap);
 333         if (ret != 0) {
 334                 dev_err(dev, "Failed to restore register map: %d\n", ret);
 335                 goto err_enable;
 336         }
 337
 338         /* Disable LDO pulldowns while the device is active */
 339         wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,
 340                         WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD,
 341                         0);
 342
 343         wm8994->suspended = false;
 344
 345         return 0;
 346
 347 err_enable:
 348         regulator_bulk_disable(wm8994->num_supplies, wm8994->supplies);
 349
 350         return ret;
 351 }
 352 #endif
 353
 354 #ifdef CONFIG_REGULATOR
 355 static int wm8994_ldo_in_use(struct wm8994_pdata *pdata, int ldo)
 356 {
 357         struct wm8994_ldo_pdata *ldo_pdata;
 358
 359         if (!pdata)
 360                 return 0;
 361
 362         ldo_pdata = &pdata->ldo[ldo];
 363
 364         if (!ldo_pdata->init_data)
 365                 return 0;
 366
 367         return ldo_pdata->init_data->num_consumer_supplies != 0;
 368 }
 369 #else
 370 static int wm8994_ldo_in_use(struct wm8994_pdata *pdata, int ldo)
 371 {
 372         return 0;
 373 }
 374 #endif
 375
 376 /*
 377  * Instantiate the generic non-control parts of the device.
 378  */
 379 static int wm8994_device_init(struct wm8994 *wm8994, int irq)
 380 {
 381         struct wm8994_pdata *pdata = wm8994->dev->platform_data;
 382         struct regmap_config *regmap_config;
 383         const char *devname;
 384         int ret, i;
 385         int pulls = 0;
 386
 387         dev_set_drvdata(wm8994->dev, wm8994);
 388
 389         /* Add the on-chip regulators first for bootstrapping */
 390         ret = mfd_add_devices(wm8994->dev, -1,
 391                               wm8994_regulator_devs,
 392                               ARRAY_SIZE(wm8994_regulator_devs),
 393                               NULL, 0);
 394         if (ret != 0) {
 395                 dev_err(wm8994->dev, "Failed to add children: %d\n", ret);
 396                 goto err_regmap;
 397         }
 398
 399         switch (wm8994->type) {
 400         case WM1811:
 401                 wm8994->num_supplies = ARRAY_SIZE(wm1811_main_supplies);
 402                 break;
 403         case WM8994:
 404                 wm8994->num_supplies = ARRAY_SIZE(wm8994_main_supplies);
 405                 break;
 406         case WM8958:
 407                 wm8994->num_supplies = ARRAY_SIZE(wm8958_main_supplies);
 408                 break;
 409         default:
 410                 BUG();
 411                 goto err_regmap;
 412         }
 413
 414         wm8994->supplies = devm_kzalloc(wm8994->dev,
 415                                         sizeof(struct regulator_bulk_data) *
 416                                         wm8994->num_supplies, GFP_KERNEL);
 417         if (!wm8994->supplies) {
 418                 ret = -ENOMEM;
 419                 goto err_regmap;
 420         }
 421
 422         switch (wm8994->type) {
 423         case WM1811:
 424                 for (i = 0; i < ARRAY_SIZE(wm1811_main_supplies); i++)
 425                         wm8994->supplies[i].supply = wm1811_main_supplies[i];
 426                 break;
 427         case WM8994:
 428                 for (i = 0; i < ARRAY_SIZE(wm8994_main_supplies); i++)
 429                         wm8994->supplies[i].supply = wm8994_main_supplies[i];
 430                 break;
 431         case WM8958:
 432                 for (i = 0; i < ARRAY_SIZE(wm8958_main_supplies); i++)
 433                         wm8994->supplies[i].supply = wm8958_main_supplies[i];
 434                 break;
 435         default:
 436                 BUG();
 437                 goto err_regmap;
 438         }
 439
 440         ret = regulator_bulk_get(wm8994->dev, wm8994->num_supplies,
 441                                  wm8994->supplies);
 442         if (ret != 0) {
 443                 dev_err(wm8994->dev, "Failed to get supplies: %d\n", ret);
 444                 goto err_regmap;
 445         }
 446
 447         ret = regulator_bulk_enable(wm8994->num_supplies,
 448                                     wm8994->supplies);
 449         if (ret != 0) {
 450                 dev_err(wm8994->dev, "Failed to enable supplies: %d\n", ret);
 451                 goto err_get;
 452         }
 453
 454         ret = wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET);
 455         if (ret < 0) {
 456                 dev_err(wm8994->dev, "Failed to read ID register\n");
 457                 goto err_enable;
 458         }
 459         switch (ret) {
 460         case 0x1811:
 461                 devname = "WM1811";
 462                 if (wm8994->type != WM1811)
 463                         dev_warn(wm8994->dev, "Device registered as type %d\n",
 464                                  wm8994->type);
 465                 wm8994->type = WM1811;
 466                 break;
 467         case 0x8994:
 468                 devname = "WM8994";
 469                 if (wm8994->type != WM8994)
 470                         dev_warn(wm8994->dev, "Device registered as type %d\n",
 471                                  wm8994->type);
 472                 wm8994->type = WM8994;
 473                 break;
 474         case 0x8958:
 475                 devname = "WM8958";
 476                 if (wm8994->type != WM8958)
 477                         dev_warn(wm8994->dev, "Device registered as type %d\n",
 478                                  wm8994->type);
 479                 wm8994->type = WM8958;
 480                 break;
 481         default:
 482                 dev_err(wm8994->dev, "Device is not a WM8994, ID is %x\n",
 483                         ret);
 484                 ret = -EINVAL;
 485                 goto err_enable;
 486         }
 487
 488         ret = wm8994_reg_read(wm8994, WM8994_CHIP_REVISION);
 489         if (ret < 0) {
 490                 dev_err(wm8994->dev, "Failed to read revision register: %d\n",
 491                         ret);
 492                 goto err_enable;
 493         }
 494         wm8994->revision = ret;
 495
 496         switch (wm8994->type) {
 497         case WM8994:
 498                 switch (wm8994->revision) {
 499                 case 0:
 500                 case 1:
 501                         dev_warn(wm8994->dev,
 502                                  "revision %c not fully supported\n",
 503                                  'A' + wm8994->revision);
 504                         break;
 505                 default:
 506                         break;
 507                 }
 508                 break;
 509         case WM1811:
 510                 /* Revision C did not change the relevant layer */
 511                 if (wm8994->revision > 1)
 512                         wm8994->revision++;
 513                 break;
 514         default:
 515                 break;
 516         }
 517
 518         dev_info(wm8994->dev, "%s revision %c\n", devname,
 519                  'A' + wm8994->revision);
 520
 521         switch (wm8994->type) {
 522         case WM1811:
 523                 regmap_config = &wm1811_regmap_config;
 524                 break;
 525         case WM8994:
 526                 regmap_config = &wm8994_regmap_config;
 527                 break;
 528         case WM8958:
 529                 regmap_config = &wm8958_regmap_config;
 530                 break;
 531         default:
 532                 dev_err(wm8994->dev, "Unknown device type %d\n", wm8994->type);
 533                 return -EINVAL;
 534         }
 535
 536         ret = regmap_reinit_cache(wm8994->regmap, regmap_config);
 537         if (ret != 0) {
 538                 dev_err(wm8994->dev, "Failed to reinit register cache: %d\n",
 539                         ret);
 540                 return ret;
 541         }
 542
 543         if (pdata) {
 544                 wm8994->irq_base = pdata->irq_base;
 545                 wm8994->gpio_base = pdata->gpio_base;
 546
 547                 /* GPIO configuration is only applied if it's non-zero */
 548                 for (i = 0; i < ARRAY_SIZE(pdata->gpio_defaults); i++) {
 549                         if (pdata->gpio_defaults[i]) {
 550                                 wm8994_set_bits(wm8994, WM8994_GPIO_1 + i,
 551                                                 0xffff,
 552                                                 pdata->gpio_defaults[i]);
 553                         }
 554                 }
 555
 556                 wm8994->ldo_ena_always_driven = pdata->ldo_ena_always_driven;
 557
 558                 if (pdata->spkmode_pu)
 559                         pulls |= WM8994_SPKMODE_PU;
 560         }
 561
 562         /* Disable unneeded pulls */
 563         wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,
 564                         WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD |
 565                         WM8994_SPKMODE_PU | WM8994_CSNADDR_PD,
 566                         pulls);
 567
 568         /* In some system designs where the regulators are not in use,
 569          * we can achieve a small reduction in leakage currents by
 570          * floating LDO outputs.  This bit makes no difference if the
 571          * LDOs are enabled, it only affects cases where the LDOs were
 572          * in operation and are then disabled.
 573          */
 574         for (i = 0; i < WM8994_NUM_LDO_REGS; i++) {
 575                 if (wm8994_ldo_in_use(pdata, i))
 576                         wm8994_set_bits(wm8994, WM8994_LDO_1 + i,
 577                                         WM8994_LDO1_DISCH, WM8994_LDO1_DISCH);
 578                 else
 579                         wm8994_set_bits(wm8994, WM8994_LDO_1 + i,
 580                                         WM8994_LDO1_DISCH, 0);
 581         }
 582
 583         wm8994_irq_init(wm8994);
 584
 585         ret = mfd_add_devices(wm8994->dev, -1,
 586                               wm8994_devs, ARRAY_SIZE(wm8994_devs),
 587                               NULL, 0);
 588         if (ret != 0) {
 589                 dev_err(wm8994->dev, "Failed to add children: %d\n", ret);
 590                 goto err_irq;
 591         }
 592
 593         pm_runtime_enable(wm8994->dev);
 594         pm_runtime_resume(wm8994->dev);
 595
 596         return 0;
 597
 598 err_irq:
 599         wm8994_irq_exit(wm8994);
 600 err_enable:
 601         regulator_bulk_disable(wm8994->num_supplies,
 602                                wm8994->supplies);
 603 err_get:
 604         regulator_bulk_free(wm8994->num_supplies, wm8994->supplies);
 605 err_regmap:
 606         regmap_exit(wm8994->regmap);
 607         mfd_remove_devices(wm8994->dev);
 608         return ret;
 609 }
 610
 611 static void wm8994_device_exit(struct wm8994 *wm8994)
 612 {
 613         pm_runtime_disable(wm8994->dev);
 614         mfd_remove_devices(wm8994->dev);
 615         wm8994_irq_exit(wm8994);
 616         regulator_bulk_disable(wm8994->num_supplies,
 617                                wm8994->supplies);
 618         regulator_bulk_free(wm8994->num_supplies, wm8994->supplies);
 619         regmap_exit(wm8994->regmap);
 620 }
 621
 622 static const struct of_device_id wm8994_of_match[] = {
 623         { .compatible = "wlf,wm1811", },
 624         { .compatible = "wlf,wm8994", },
 625         { .compatible = "wlf,wm8958", },
 626         { }
 627 };
 628 MODULE_DEVICE_TABLE(of, wm8994_of_match);
 629
 630 static int wm8994_i2c_probe(struct i2c_client *i2c,
 631                             const struct i2c_device_id *id)
 632 {
 633         struct wm8994 *wm8994;
 634         int ret;
 635
 636         wm8994 = devm_kzalloc(&i2c->dev, sizeof(struct wm8994), GFP_KERNEL);
 637         if (wm8994 == NULL)
 638                 return -ENOMEM;
 639
 640         i2c_set_clientdata(i2c, wm8994);
 641         wm8994->dev = &i2c->dev;
 642         wm8994->irq = i2c->irq;
 643         wm8994->type = id->driver_data;
 644
 645         wm8994->regmap = regmap_init_i2c(i2c, &wm8994_base_regmap_config);
 646         if (IS_ERR(wm8994->regmap)) {
 647                 ret = PTR_ERR(wm8994->regmap);
 648                 dev_err(wm8994->dev, "Failed to allocate register map: %d\n",
 649                         ret);
 650                 return ret;
 651         }
 652
 653         return wm8994_device_init(wm8994, i2c->irq);
 654 }
 655
 656 static int wm8994_i2c_remove(struct i2c_client *i2c)
 657 {
 658         struct wm8994 *wm8994 = i2c_get_clientdata(i2c);
 659
 660         wm8994_device_exit(wm8994);
 661
 662         return 0;
 663 }
 664
 665 static const struct i2c_device_id wm8994_i2c_id[] = {
 666         { "wm1811", WM1811 },
 667         { "wm1811a", WM1811 },
 668         { "wm8994", WM8994 },
 669         { "wm8958", WM8958 },
 670         { }
 671 };
 672 MODULE_DEVICE_TABLE(i2c, wm8994_i2c_id);
 673
 674 static UNIVERSAL_DEV_PM_OPS(wm8994_pm_ops, wm8994_suspend, wm8994_resume,
 675                             NULL);
 676
 677 static struct i2c_driver wm8994_i2c_driver = {
 678         .driver = {
 679                 .name = "wm8994",
 680                 .owner = THIS_MODULE,
 681                 .pm = &wm8994_pm_ops,
 682                 .of_match_table = wm8994_of_match,
 683         },
 684         .probe = wm8994_i2c_probe,
 685         .remove = wm8994_i2c_remove,
 686         .id_table = wm8994_i2c_id,
 687 };
 688
 689 static int __init wm8994_i2c_init(void)
 690 {
 691         int ret;
 692
 693         ret = i2c_add_driver(&wm8994_i2c_driver);
 694         if (ret != 0)
 695                 pr_err("Failed to register wm8994 I2C driver: %d\n", ret);
 696
 697         return ret;
 698 }
 699 module_init(wm8994_i2c_init);
 700
 701 static void __exit wm8994_i2c_exit(void)
 702 {
 703         i2c_del_driver(&wm8994_i2c_driver);
 704 }
 705 module_exit(wm8994_i2c_exit);
 706
 707 MODULE_DESCRIPTION("Core support for the WM8994 audio CODEC");
 708 MODULE_LICENSE("GPL");
 709 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");