drivers/mfd/wm8994-core.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * wm8994-core.c  --  Device access for Wolfson WM8994
   4  *
   5  * Copyright 2009 Wolfson Microelectronics PLC.
   6  *
   7  * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/module.h>
  12 #include <linux/slab.h>
  13 #include <linux/i2c.h>
  14 #include <linux/err.h>
  15 #include <linux/delay.h>
  16 #include <linux/mfd/core.h>
  17 #include <linux/of.h>
  18 #include <linux/of_device.h>
  19 #include <linux/pm_runtime.h>
  20 #include <linux/regmap.h>
  21 #include <linux/regulator/consumer.h>
  22 #include <linux/regulator/machine.h>
  23
  24 #include <linux/mfd/wm8994/core.h>
  25 #include <linux/mfd/wm8994/pdata.h>
  26 #include <linux/mfd/wm8994/registers.h>
  27
  28 #include "wm8994.h"
  29
  30 static const struct mfd_cell wm8994_regulator_devs[] = {
  31         {
  32                 .name = "wm8994-ldo",
  33                 .id = 0,
  34                 .pm_runtime_no_callbacks = true,
  35         },
  36         {
  37                 .name = "wm8994-ldo",
  38                 .id = 1,
  39                 .pm_runtime_no_callbacks = true,
  40         },
  41 };
  42
  43 static const struct resource wm8994_codec_resources[] = {
  44         {
  45                 .start = WM8994_IRQ_TEMP_SHUT,
  46                 .end   = WM8994_IRQ_TEMP_WARN,
  47                 .flags = IORESOURCE_IRQ,
  48         },
  49 };
  50
  51 static const struct resource wm8994_gpio_resources[] = {
  52         {
  53                 .start = WM8994_IRQ_GPIO(1),
  54                 .end   = WM8994_IRQ_GPIO(11),
  55                 .flags = IORESOURCE_IRQ,
  56         },
  57 };
  58
  59 static const struct mfd_cell wm8994_devs[] = {
  60         {
  61                 .name = "wm8994-codec",
  62                 .num_resources = ARRAY_SIZE(wm8994_codec_resources),
  63                 .resources = wm8994_codec_resources,
  64         },
  65
  66         {
  67                 .name = "wm8994-gpio",
  68                 .num_resources = ARRAY_SIZE(wm8994_gpio_resources),
  69                 .resources = wm8994_gpio_resources,
  70                 .pm_runtime_no_callbacks = true,
  71         },
  72 };
  73
  74 /*
  75  * Supplies for the main bulk of CODEC; the LDO supplies are ignored
  76  * and should be handled via the standard regulator API supply
  77  * management.
  78  */
  79 static const char *wm1811_main_supplies[] = {
  80         "DBVDD1",
  81         "DBVDD2",
  82         "DBVDD3",
  83         "DCVDD",
  84         "AVDD1",
  85         "AVDD2",
  86         "CPVDD",
  87         "SPKVDD1",
  88         "SPKVDD2",
  89 };
  90
  91 static const char *wm8994_main_supplies[] = {
  92         "DBVDD",
  93         "DCVDD",
  94         "AVDD1",
  95         "AVDD2",
  96         "CPVDD",
  97         "SPKVDD1",
  98         "SPKVDD2",
  99 };
 100
 101 static const char *wm8958_main_supplies[] = {
 102         "DBVDD1",
 103         "DBVDD2",
 104         "DBVDD3",
 105         "DCVDD",
 106         "AVDD1",
 107         "AVDD2",
 108         "CPVDD",
 109         "SPKVDD1",
 110         "SPKVDD2",
 111 };
 112
 113 static int wm8994_suspend(struct device *dev)
 114 {
 115         struct wm8994 *wm8994 = dev_get_drvdata(dev);
 116         int ret;
 117
 118         /* Don't actually go through with the suspend if the CODEC is
 119          * still active for accessory detect. */
 120         switch (wm8994->type) {
 121         case WM8958:
 122         case WM1811:
 123                 ret = wm8994_reg_read(wm8994, WM8958_MIC_DETECT_1);
 124                 if (ret < 0) {
 125                         dev_err(dev, "Failed to read power status: %d\n", ret);
 126                 } else if (ret & WM8958_MICD_ENA) {
 127                         dev_dbg(dev, "CODEC still active, ignoring suspend\n");
 128                         return 0;
 129                 }
 130                 break;
 131         default:
 132                 break;
 133         }
 134
 135         /* Disable LDO pulldowns while the device is suspended if we
 136          * don't know that something will be driving them. */
 137         if (!wm8994->ldo_ena_always_driven)
 138                 wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,
 139                                 WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD,
 140                                 WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD);
 141
 142         /* Explicitly put the device into reset in case regulators
 143          * don't get disabled in order to ensure consistent restart.
 144          */
 145         wm8994_reg_write(wm8994, WM8994_SOFTWARE_RESET,
 146                          wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET));
 147
 148         regcache_mark_dirty(wm8994->regmap);
 149
 150         /* Restore GPIO registers to prevent problems with mismatched
 151          * pin configurations.
 152          */
 153         ret = regcache_sync_region(wm8994->regmap, WM8994_GPIO_1,
 154                                    WM8994_GPIO_11);
 155         if (ret != 0)
 156                 dev_err(dev, "Failed to restore GPIO registers: %d\n", ret);
 157
 158         /* In case one of the GPIOs is used as a wake input. */
 159         ret = regcache_sync_region(wm8994->regmap,
 160                                    WM8994_INTERRUPT_STATUS_1_MASK,
 161                                    WM8994_INTERRUPT_STATUS_1_MASK);
 162         if (ret != 0)
 163                 dev_err(dev, "Failed to restore interrupt mask: %d\n", ret);
 164
 165         regcache_cache_only(wm8994->regmap, true);
 166         wm8994->suspended = true;
 167
 168         ret = regulator_bulk_disable(wm8994->num_supplies,
 169                                      wm8994->supplies);
 170         if (ret != 0) {
 171                 dev_err(dev, "Failed to disable supplies: %d\n", ret);
 172                 return ret;
 173         }
 174
 175         return 0;
 176 }
 177
 178 static int wm8994_resume(struct device *dev)
 179 {
 180         struct wm8994 *wm8994 = dev_get_drvdata(dev);
 181         int ret;
 182
 183         /* We may have lied to the PM core about suspending */
 184         if (!wm8994->suspended)
 185                 return 0;
 186
 187         ret = regulator_bulk_enable(wm8994->num_supplies,
 188                                     wm8994->supplies);
 189         if (ret != 0) {
 190                 dev_err(dev, "Failed to enable supplies: %d\n", ret);
 191                 return ret;
 192         }
 193
 194         regcache_cache_only(wm8994->regmap, false);
 195         ret = regcache_sync(wm8994->regmap);
 196         if (ret != 0) {
 197                 dev_err(dev, "Failed to restore register map: %d\n", ret);
 198                 goto err_enable;
 199         }
 200
 201         /* Disable LDO pulldowns while the device is active */
 202         wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,
 203                         WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD,
 204                         0);
 205
 206         wm8994->suspended = false;
 207
 208         return 0;
 209
 210 err_enable:
 211         regulator_bulk_disable(wm8994->num_supplies, wm8994->supplies);
 212
 213         return ret;
 214 }
 215
 216 #ifdef CONFIG_REGULATOR
 217 static int wm8994_ldo_in_use(struct wm8994_pdata *pdata, int ldo)
 218 {
 219         struct wm8994_ldo_pdata *ldo_pdata;
 220
 221         if (!pdata)
 222                 return 0;
 223
 224         ldo_pdata = &pdata->ldo[ldo];
 225
 226         if (!ldo_pdata->init_data)
 227                 return 0;
 228
 229         return ldo_pdata->init_data->num_consumer_supplies != 0;
 230 }
 231 #else
 232 static int wm8994_ldo_in_use(struct wm8994_pdata *pdata, int ldo)
 233 {
 234         return 0;
 235 }
 236 #endif
 237
 238 static const struct reg_sequence wm8994_revc_patch[] = {
 239         { 0x102, 0x3 },
 240         { 0x56, 0x3 },
 241         { 0x817, 0x0 },
 242         { 0x102, 0x0 },
 243 };
 244
 245 static const struct reg_sequence wm8958_reva_patch[] = {
 246         { 0x102, 0x3 },
 247         { 0xcb, 0x81 },
 248         { 0x817, 0x0 },
 249         { 0x102, 0x0 },
 250 };
 251
 252 static const struct reg_sequence wm1811_reva_patch[] = {
 253         { 0x102, 0x3 },
 254         { 0x56, 0xc07 },
 255         { 0x5d, 0x7e },
 256         { 0x5e, 0x0 },
 257         { 0x102, 0x0 },
 258 };
 259
 260 #ifdef CONFIG_OF
 261 static int wm8994_set_pdata_from_of(struct wm8994 *wm8994)
 262 {
 263         struct device_node *np = wm8994->dev->of_node;
 264         struct wm8994_pdata *pdata = &wm8994->pdata;
 265         int i;
 266
 267         if (!np)
 268                 return 0;
 269
 270         if (of_property_read_u32_array(np, "wlf,gpio-cfg", pdata->gpio_defaults,
 271                                        ARRAY_SIZE(pdata->gpio_defaults)) >= 0) {
 272                 for (i = 0; i < ARRAY_SIZE(pdata->gpio_defaults); i++) {
 273                         if (wm8994->pdata.gpio_defaults[i] == 0)
 274                                 pdata->gpio_defaults[i]
 275                                         = WM8994_CONFIGURE_GPIO;
 276                 }
 277         }
 278
 279         of_property_read_u32_array(np, "wlf,micbias-cfg", pdata->micbias,
 280                                    ARRAY_SIZE(pdata->micbias));
 281
 282         pdata->lineout1_diff = !of_property_read_bool(np, "wlf,lineout1-se");
 283         pdata->lineout2_diff = !of_property_read_bool(np, "wlf,lineout2-se");
 284         pdata->lineout1fb = of_property_read_bool(np, "wlf,lineout1-feedback");
 285         pdata->lineout2fb = of_property_read_bool(np, "wlf,lineout2-feedback") ||
 286                 of_property_read_bool(np, "wlf,ldoena-always-driven");
 287
 288         pdata->spkmode_pu = of_property_read_bool(np, "wlf,spkmode-pu");
 289
 290         pdata->csnaddr_pd = of_property_read_bool(np, "wlf,csnaddr-pd");
 291
 292         return 0;
 293 }
 294 #else
 295 static int wm8994_set_pdata_from_of(struct wm8994 *wm8994)
 296 {
 297         return 0;
 298 }
 299 #endif
 300
 301 /*
 302  * Instantiate the generic non-control parts of the device.
 303  */
 304 static int wm8994_device_init(struct wm8994 *wm8994, int irq)
 305 {
 306         struct wm8994_pdata *pdata;
 307         struct regmap_config *regmap_config;
 308         const struct reg_sequence *regmap_patch = NULL;
 309         const char *devname;
 310         int ret, i, patch_regs = 0;
 311         int pulls = 0;
 312
 313         if (dev_get_platdata(wm8994->dev)) {
 314                 pdata = dev_get_platdata(wm8994->dev);
 315                 wm8994->pdata = *pdata;
 316         }
 317         pdata = &wm8994->pdata;
 318
 319         ret = wm8994_set_pdata_from_of(wm8994);
 320         if (ret != 0)
 321                 return ret;
 322
 323         /* Add the on-chip regulators first for bootstrapping */
 324         ret = mfd_add_devices(wm8994->dev, 0,
 325                               wm8994_regulator_devs,
 326                               ARRAY_SIZE(wm8994_regulator_devs),
 327                               NULL, 0, NULL);
 328         if (ret != 0) {
 329                 dev_err(wm8994->dev, "Failed to add children: %d\n", ret);
 330                 goto err;
 331         }
 332
 333         switch (wm8994->type) {
 334         case WM1811:
 335                 wm8994->num_supplies = ARRAY_SIZE(wm1811_main_supplies);
 336                 break;
 337         case WM8994:
 338                 wm8994->num_supplies = ARRAY_SIZE(wm8994_main_supplies);
 339                 break;
 340         case WM8958:
 341                 wm8994->num_supplies = ARRAY_SIZE(wm8958_main_supplies);
 342                 break;
 343         default:
 344                 BUG();
 345                 goto err;
 346         }
 347
 348         wm8994->supplies = devm_kcalloc(wm8994->dev,
 349                                         wm8994->num_supplies,
 350                                         sizeof(struct regulator_bulk_data),
 351                                         GFP_KERNEL);
 352         if (!wm8994->supplies) {
 353                 ret = -ENOMEM;
 354                 goto err;
 355         }
 356
 357         switch (wm8994->type) {
 358         case WM1811:
 359                 for (i = 0; i < ARRAY_SIZE(wm1811_main_supplies); i++)
 360                         wm8994->supplies[i].supply = wm1811_main_supplies[i];
 361                 break;
 362         case WM8994:
 363                 for (i = 0; i < ARRAY_SIZE(wm8994_main_supplies); i++)
 364                         wm8994->supplies[i].supply = wm8994_main_supplies[i];
 365                 break;
 366         case WM8958:
 367                 for (i = 0; i < ARRAY_SIZE(wm8958_main_supplies); i++)
 368                         wm8994->supplies[i].supply = wm8958_main_supplies[i];
 369                 break;
 370         default:
 371                 BUG();
 372                 goto err;
 373         }
 374
 375         /*
 376          * Can't use devres helper here as some of the supplies are provided by
 377          * wm8994->dev's children (regulators) and those regulators are
 378          * unregistered by the devres core before the supplies are freed.
 379          */
 380         ret = regulator_bulk_get(wm8994->dev, wm8994->num_supplies,
 381                                  wm8994->supplies);
 382         if (ret != 0) {
 383                 if (ret != -EPROBE_DEFER)
 384                         dev_err(wm8994->dev, "Failed to get supplies: %d\n",
 385                                 ret);
 386                 goto err;
 387         }
 388
 389         ret = regulator_bulk_enable(wm8994->num_supplies, wm8994->supplies);
 390         if (ret != 0) {
 391                 dev_err(wm8994->dev, "Failed to enable supplies: %d\n", ret);
 392                 goto err_regulator_free;
 393         }
 394
 395         ret = wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET);
 396         if (ret < 0) {
 397                 dev_err(wm8994->dev, "Failed to read ID register\n");
 398                 goto err_enable;
 399         }
 400         switch (ret) {
 401         case 0x1811:
 402                 devname = "WM1811";
 403                 if (wm8994->type != WM1811)
 404                         dev_warn(wm8994->dev, "Device registered as type %d\n",
 405                                  wm8994->type);
 406                 wm8994->type = WM1811;
 407                 break;
 408         case 0x8994:
 409                 devname = "WM8994";
 410                 if (wm8994->type != WM8994)
 411                         dev_warn(wm8994->dev, "Device registered as type %d\n",
 412                                  wm8994->type);
 413                 wm8994->type = WM8994;
 414                 break;
 415         case 0x8958:
 416                 devname = "WM8958";
 417                 if (wm8994->type != WM8958)
 418                         dev_warn(wm8994->dev, "Device registered as type %d\n",
 419                                  wm8994->type);
 420                 wm8994->type = WM8958;
 421                 break;
 422         default:
 423                 dev_err(wm8994->dev, "Device is not a WM8994, ID is %x\n",
 424                         ret);
 425                 ret = -EINVAL;
 426                 goto err_enable;
 427         }
 428
 429         ret = wm8994_reg_read(wm8994, WM8994_CHIP_REVISION);
 430         if (ret < 0) {
 431                 dev_err(wm8994->dev, "Failed to read revision register: %d\n",
 432                         ret);
 433                 goto err_enable;
 434         }
 435         wm8994->revision = ret & WM8994_CHIP_REV_MASK;
 436         wm8994->cust_id = (ret & WM8994_CUST_ID_MASK) >> WM8994_CUST_ID_SHIFT;
 437
 438         switch (wm8994->type) {
 439         case WM8994:
 440                 switch (wm8994->revision) {
 441                 case 0:
 442                 case 1:
 443                         dev_warn(wm8994->dev,
 444                                  "revision %c not fully supported\n",
 445                                  'A' + wm8994->revision);
 446                         break;
 447                 case 2:
 448                 case 3:
 449                 default:
 450                         regmap_patch = wm8994_revc_patch;
 451                         patch_regs = ARRAY_SIZE(wm8994_revc_patch);
 452                         break;
 453                 }
 454                 break;
 455
 456         case WM8958:
 457                 switch (wm8994->revision) {
 458                 case 0:
 459                         regmap_patch = wm8958_reva_patch;
 460                         patch_regs = ARRAY_SIZE(wm8958_reva_patch);
 461                         break;
 462                 default:
 463                         break;
 464                 }
 465                 break;
 466
 467         case WM1811:
 468                 /* Revision C did not change the relevant layer */
 469                 if (wm8994->revision > 1)
 470                         wm8994->revision++;
 471
 472                 regmap_patch = wm1811_reva_patch;
 473                 patch_regs = ARRAY_SIZE(wm1811_reva_patch);
 474                 break;
 475
 476         default:
 477                 break;
 478         }
 479
 480         dev_info(wm8994->dev, "%s revision %c CUST_ID %02x\n", devname,
 481                  'A' + wm8994->revision, wm8994->cust_id);
 482
 483         switch (wm8994->type) {
 484         case WM1811:
 485                 regmap_config = &wm1811_regmap_config;
 486                 break;
 487         case WM8994:
 488                 regmap_config = &wm8994_regmap_config;
 489                 break;
 490         case WM8958:
 491                 regmap_config = &wm8958_regmap_config;
 492                 break;
 493         default:
 494                 dev_err(wm8994->dev, "Unknown device type %d\n", wm8994->type);
 495                 ret = -EINVAL;
 496                 goto err_enable;
 497         }
 498
 499         ret = regmap_reinit_cache(wm8994->regmap, regmap_config);
 500         if (ret != 0) {
 501                 dev_err(wm8994->dev, "Failed to reinit register cache: %d\n",
 502                         ret);
 503                 goto err_enable;
 504         }
 505
 506         /* Explicitly put the device into reset in case regulators
 507          * don't get disabled in order to ensure we know the device
 508          * state.
 509          */
 510         ret = wm8994_reg_write(wm8994, WM8994_SOFTWARE_RESET,
 511                                wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET));
 512         if (ret != 0) {
 513                 dev_err(wm8994->dev, "Failed to reset device: %d\n", ret);
 514                 goto err_enable;
 515         }
 516
 517         if (regmap_patch) {
 518                 ret = regmap_register_patch(wm8994->regmap, regmap_patch,
 519                                             patch_regs);
 520                 if (ret != 0) {
 521                         dev_err(wm8994->dev, "Failed to register patch: %d\n",
 522                                 ret);
 523                         goto err_enable;
 524                 }
 525         }
 526
 527         wm8994->irq_base = pdata->irq_base;
 528         wm8994->gpio_base = pdata->gpio_base;
 529
 530         /* GPIO configuration is only applied if it's non-zero */
 531         for (i = 0; i < ARRAY_SIZE(pdata->gpio_defaults); i++) {
 532                 if (pdata->gpio_defaults[i]) {
 533                         wm8994_set_bits(wm8994, WM8994_GPIO_1 + i,
 534                                         0xffff, pdata->gpio_defaults[i]);
 535                 }
 536         }
 537
 538         wm8994->ldo_ena_always_driven = pdata->ldo_ena_always_driven;
 539
 540         if (pdata->spkmode_pu)
 541                 pulls |= WM8994_SPKMODE_PU;
 542         if (pdata->csnaddr_pd)
 543                 pulls |= WM8994_CSNADDR_PD;
 544
 545         /* Disable unneeded pulls */
 546         wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,
 547                         WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD |
 548                         WM8994_SPKMODE_PU | WM8994_CSNADDR_PD,
 549                         pulls);
 550
 551         /* In some system designs where the regulators are not in use,
 552          * we can achieve a small reduction in leakage currents by
 553          * floating LDO outputs.  This bit makes no difference if the
 554          * LDOs are enabled, it only affects cases where the LDOs were
 555          * in operation and are then disabled.
 556          */
 557         for (i = 0; i < WM8994_NUM_LDO_REGS; i++) {
 558                 if (wm8994_ldo_in_use(pdata, i))
 559                         wm8994_set_bits(wm8994, WM8994_LDO_1 + i,
 560                                         WM8994_LDO1_DISCH, WM8994_LDO1_DISCH);
 561                 else
 562                         wm8994_set_bits(wm8994, WM8994_LDO_1 + i,
 563                                         WM8994_LDO1_DISCH, 0);
 564         }
 565
 566         wm8994_irq_init(wm8994);
 567
 568         ret = mfd_add_devices(wm8994->dev, -1,
 569                               wm8994_devs, ARRAY_SIZE(wm8994_devs),
 570                               NULL, 0, NULL);
 571         if (ret != 0) {
 572                 dev_err(wm8994->dev, "Failed to add children: %d\n", ret);
 573                 goto err_irq;
 574         }
 575
 576         pm_runtime_set_active(wm8994->dev);
 577         pm_runtime_enable(wm8994->dev);
 578         pm_runtime_idle(wm8994->dev);
 579
 580         return 0;
 581
 582 err_irq:
 583         wm8994_irq_exit(wm8994);
 584 err_enable:
 585         regulator_bulk_disable(wm8994->num_supplies,
 586                                wm8994->supplies);
 587 err_regulator_free:
 588         regulator_bulk_free(wm8994->num_supplies, wm8994->supplies);
 589 err:
 590         mfd_remove_devices(wm8994->dev);
 591         return ret;
 592 }
 593
 594 static void wm8994_device_exit(struct wm8994 *wm8994)
 595 {
 596         pm_runtime_get_sync(wm8994->dev);
 597         pm_runtime_disable(wm8994->dev);
 598         pm_runtime_put_noidle(wm8994->dev);
 599         wm8994_irq_exit(wm8994);
 600         regulator_bulk_disable(wm8994->num_supplies, wm8994->supplies);
 601         regulator_bulk_free(wm8994->num_supplies, wm8994->supplies);
 602         mfd_remove_devices(wm8994->dev);
 603 }
 604
 605 static const struct of_device_id wm8994_of_match[] = {
 606         { .compatible = "wlf,wm1811", .data = (void *)WM1811 },
 607         { .compatible = "wlf,wm8994", .data = (void *)WM8994 },
 608         { .compatible = "wlf,wm8958", .data = (void *)WM8958 },
 609         { }
 610 };
 611 MODULE_DEVICE_TABLE(of, wm8994_of_match);
 612
 613 static int wm8994_i2c_probe(struct i2c_client *i2c)
 614 {
 615         const struct i2c_device_id *id = i2c_client_get_device_id(i2c);
 616         const struct of_device_id *of_id;
 617         struct wm8994 *wm8994;
 618         int ret;
 619
 620         wm8994 = devm_kzalloc(&i2c->dev, sizeof(struct wm8994), GFP_KERNEL);
 621         if (wm8994 == NULL)
 622                 return -ENOMEM;
 623
 624         i2c_set_clientdata(i2c, wm8994);
 625         wm8994->dev = &i2c->dev;
 626         wm8994->irq = i2c->irq;
 627
 628         if (i2c->dev.of_node) {
 629                 of_id = of_match_device(wm8994_of_match, &i2c->dev);
 630                 if (of_id)
 631                         wm8994->type = (uintptr_t)of_id->data;
 632         } else {
 633                 wm8994->type = id->driver_data;
 634         }
 635
 636         wm8994->regmap = devm_regmap_init_i2c(i2c, &wm8994_base_regmap_config);
 637         if (IS_ERR(wm8994->regmap)) {
 638                 ret = PTR_ERR(wm8994->regmap);
 639                 dev_err(wm8994->dev, "Failed to allocate register map: %d\n",
 640                         ret);
 641                 return ret;
 642         }
 643
 644         return wm8994_device_init(wm8994, i2c->irq);
 645 }
 646
 647 static void wm8994_i2c_remove(struct i2c_client *i2c)
 648 {
 649         struct wm8994 *wm8994 = i2c_get_clientdata(i2c);
 650
 651         wm8994_device_exit(wm8994);
 652 }
 653
 654 static const struct i2c_device_id wm8994_i2c_id[] = {
 655         { "wm1811", WM1811 },
 656         { "wm1811a", WM1811 },
 657         { "wm8994", WM8994 },
 658         { "wm8958", WM8958 },
 659         { }
 660 };
 661 MODULE_DEVICE_TABLE(i2c, wm8994_i2c_id);
 662
 663 static const struct dev_pm_ops wm8994_pm_ops = {
 664         RUNTIME_PM_OPS(wm8994_suspend, wm8994_resume, NULL)
 665 };
 666
 667 static struct i2c_driver wm8994_i2c_driver = {
 668         .driver = {
 669                 .name = "wm8994",
 670                 .pm = pm_ptr(&wm8994_pm_ops),
 671                 .of_match_table = wm8994_of_match,
 672         },
 673         .probe = wm8994_i2c_probe,
 674         .remove = wm8994_i2c_remove,
 675         .id_table = wm8994_i2c_id,
 676 };
 677
 678 module_i2c_driver(wm8994_i2c_driver);
 679
 680 MODULE_DESCRIPTION("Core support for the WM8994 audio CODEC");
 681 MODULE_LICENSE("GPL");
 682 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 683 MODULE_SOFTDEP("pre: wm8994_regulator");