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 #ifdef CONFIG_PM
 114 static int wm8994_suspend(struct device *dev)
 115 {
 116         struct wm8994 *wm8994 = dev_get_drvdata(dev);
 117         int ret;
 118
 119         /* Don't actually go through with the suspend if the CODEC is
 120          * still active for accessory detect. */
 121         switch (wm8994->type) {
 122         case WM8958:
 123         case WM1811:
 124                 ret = wm8994_reg_read(wm8994, WM8958_MIC_DETECT_1);
 125                 if (ret < 0) {
 126                         dev_err(dev, "Failed to read power status: %d\n", ret);
 127                 } else if (ret & WM8958_MICD_ENA) {
 128                         dev_dbg(dev, "CODEC still active, ignoring suspend\n");
 129                         return 0;
 130                 }
 131                 break;
 132         default:
 133                 break;
 134         }
 135
 136         /* Disable LDO pulldowns while the device is suspended if we
 137          * don't know that something will be driving them. */
 138         if (!wm8994->ldo_ena_always_driven)
 139                 wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,
 140                                 WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD,
 141                                 WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD);
 142
 143         /* Explicitly put the device into reset in case regulators
 144          * don't get disabled in order to ensure consistent restart.
 145          */
 146         wm8994_reg_write(wm8994, WM8994_SOFTWARE_RESET,
 147                          wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET));
 148
 149         regcache_mark_dirty(wm8994->regmap);
 150
 151         /* Restore GPIO registers to prevent problems with mismatched
 152          * pin configurations.
 153          */
 154         ret = regcache_sync_region(wm8994->regmap, WM8994_GPIO_1,
 155                                    WM8994_GPIO_11);
 156         if (ret != 0)
 157                 dev_err(dev, "Failed to restore GPIO registers: %d\n", ret);
 158
 159         /* In case one of the GPIOs is used as a wake input. */
 160         ret = regcache_sync_region(wm8994->regmap,
 161                                    WM8994_INTERRUPT_STATUS_1_MASK,
 162                                    WM8994_INTERRUPT_STATUS_1_MASK);
 163         if (ret != 0)
 164                 dev_err(dev, "Failed to restore interrupt mask: %d\n", ret);
 165
 166         regcache_cache_only(wm8994->regmap, true);
 167         wm8994->suspended = true;
 168
 169         ret = regulator_bulk_disable(wm8994->num_supplies,
 170                                      wm8994->supplies);
 171         if (ret != 0) {
 172                 dev_err(dev, "Failed to disable supplies: %d\n", ret);
 173                 return ret;
 174         }
 175
 176         return 0;
 177 }
 178
 179 static int wm8994_resume(struct device *dev)
 180 {
 181         struct wm8994 *wm8994 = dev_get_drvdata(dev);
 182         int ret;
 183
 184         /* We may have lied to the PM core about suspending */
 185         if (!wm8994->suspended)
 186                 return 0;
 187
 188         ret = regulator_bulk_enable(wm8994->num_supplies,
 189                                     wm8994->supplies);
 190         if (ret != 0) {
 191                 dev_err(dev, "Failed to enable supplies: %d\n", ret);
 192                 return ret;
 193         }
 194
 195         regcache_cache_only(wm8994->regmap, false);
 196         ret = regcache_sync(wm8994->regmap);
 197         if (ret != 0) {
 198                 dev_err(dev, "Failed to restore register map: %d\n", ret);
 199                 goto err_enable;
 200         }
 201
 202         /* Disable LDO pulldowns while the device is active */
 203         wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,
 204                         WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD,
 205                         0);
 206
 207         wm8994->suspended = false;
 208
 209         return 0;
 210
 211 err_enable:
 212         regulator_bulk_disable(wm8994->num_supplies, wm8994->supplies);
 213
 214         return ret;
 215 }
 216 #endif
 217
 218 #ifdef CONFIG_REGULATOR
 219 static int wm8994_ldo_in_use(struct wm8994_pdata *pdata, int ldo)
 220 {
 221         struct wm8994_ldo_pdata *ldo_pdata;
 222
 223         if (!pdata)
 224                 return 0;
 225
 226         ldo_pdata = &pdata->ldo[ldo];
 227
 228         if (!ldo_pdata->init_data)
 229                 return 0;
 230
 231         return ldo_pdata->init_data->num_consumer_supplies != 0;
 232 }
 233 #else
 234 static int wm8994_ldo_in_use(struct wm8994_pdata *pdata, int ldo)
 235 {
 236         return 0;
 237 }
 238 #endif
 239
 240 static const struct reg_sequence wm8994_revc_patch[] = {
 241         { 0x102, 0x3 },
 242         { 0x56, 0x3 },
 243         { 0x817, 0x0 },
 244         { 0x102, 0x0 },
 245 };
 246
 247 static const struct reg_sequence wm8958_reva_patch[] = {
 248         { 0x102, 0x3 },
 249         { 0xcb, 0x81 },
 250         { 0x817, 0x0 },
 251         { 0x102, 0x0 },
 252 };
 253
 254 static const struct reg_sequence wm1811_reva_patch[] = {
 255         { 0x102, 0x3 },
 256         { 0x56, 0xc07 },
 257         { 0x5d, 0x7e },
 258         { 0x5e, 0x0 },
 259         { 0x102, 0x0 },
 260 };
 261
 262 #ifdef CONFIG_OF
 263 static int wm8994_set_pdata_from_of(struct wm8994 *wm8994)
 264 {
 265         struct device_node *np = wm8994->dev->of_node;
 266         struct wm8994_pdata *pdata = &wm8994->pdata;
 267         int i;
 268
 269         if (!np)
 270                 return 0;
 271
 272         if (of_property_read_u32_array(np, "wlf,gpio-cfg", pdata->gpio_defaults,
 273                                        ARRAY_SIZE(pdata->gpio_defaults)) >= 0) {
 274                 for (i = 0; i < ARRAY_SIZE(pdata->gpio_defaults); i++) {
 275                         if (wm8994->pdata.gpio_defaults[i] == 0)
 276                                 pdata->gpio_defaults[i]
 277                                         = WM8994_CONFIGURE_GPIO;
 278                 }
 279         }
 280
 281         of_property_read_u32_array(np, "wlf,micbias-cfg", pdata->micbias,
 282                                    ARRAY_SIZE(pdata->micbias));
 283
 284         pdata->lineout1_diff = true;
 285         pdata->lineout2_diff = true;
 286         if (of_find_property(np, "wlf,lineout1-se", NULL))
 287                 pdata->lineout1_diff = false;
 288         if (of_find_property(np, "wlf,lineout2-se", NULL))
 289                 pdata->lineout2_diff = false;
 290
 291         if (of_find_property(np, "wlf,lineout1-feedback", NULL))
 292                 pdata->lineout1fb = true;
 293         if (of_find_property(np, "wlf,lineout2-feedback", NULL))
 294                 pdata->lineout2fb = true;
 295
 296         if (of_find_property(np, "wlf,ldoena-always-driven", NULL))
 297                 pdata->lineout2fb = true;
 298
 299         pdata->spkmode_pu = of_property_read_bool(np, "wlf,spkmode-pu");
 300
 301         pdata->csnaddr_pd = of_property_read_bool(np, "wlf,csnaddr-pd");
 302
 303         return 0;
 304 }
 305 #else
 306 static int wm8994_set_pdata_from_of(struct wm8994 *wm8994)
 307 {
 308         return 0;
 309 }
 310 #endif
 311
 312 /*
 313  * Instantiate the generic non-control parts of the device.
 314  */
 315 static int wm8994_device_init(struct wm8994 *wm8994, int irq)
 316 {
 317         struct wm8994_pdata *pdata;
 318         struct regmap_config *regmap_config;
 319         const struct reg_sequence *regmap_patch = NULL;
 320         const char *devname;
 321         int ret, i, patch_regs = 0;
 322         int pulls = 0;
 323
 324         if (dev_get_platdata(wm8994->dev)) {
 325                 pdata = dev_get_platdata(wm8994->dev);
 326                 wm8994->pdata = *pdata;
 327         }
 328         pdata = &wm8994->pdata;
 329
 330         ret = wm8994_set_pdata_from_of(wm8994);
 331         if (ret != 0)
 332                 return ret;
 333
 334         dev_set_drvdata(wm8994->dev, wm8994);
 335
 336         /* Add the on-chip regulators first for bootstrapping */
 337         ret = mfd_add_devices(wm8994->dev, 0,
 338                               wm8994_regulator_devs,
 339                               ARRAY_SIZE(wm8994_regulator_devs),
 340                               NULL, 0, NULL);
 341         if (ret != 0) {
 342                 dev_err(wm8994->dev, "Failed to add children: %d\n", ret);
 343                 goto err;
 344         }
 345
 346         switch (wm8994->type) {
 347         case WM1811:
 348                 wm8994->num_supplies = ARRAY_SIZE(wm1811_main_supplies);
 349                 break;
 350         case WM8994:
 351                 wm8994->num_supplies = ARRAY_SIZE(wm8994_main_supplies);
 352                 break;
 353         case WM8958:
 354                 wm8994->num_supplies = ARRAY_SIZE(wm8958_main_supplies);
 355                 break;
 356         default:
 357                 BUG();
 358                 goto err;
 359         }
 360
 361         wm8994->supplies = devm_kcalloc(wm8994->dev,
 362                                         wm8994->num_supplies,
 363                                         sizeof(struct regulator_bulk_data),
 364                                         GFP_KERNEL);
 365         if (!wm8994->supplies) {
 366                 ret = -ENOMEM;
 367                 goto err;
 368         }
 369
 370         switch (wm8994->type) {
 371         case WM1811:
 372                 for (i = 0; i < ARRAY_SIZE(wm1811_main_supplies); i++)
 373                         wm8994->supplies[i].supply = wm1811_main_supplies[i];
 374                 break;
 375         case WM8994:
 376                 for (i = 0; i < ARRAY_SIZE(wm8994_main_supplies); i++)
 377                         wm8994->supplies[i].supply = wm8994_main_supplies[i];
 378                 break;
 379         case WM8958:
 380                 for (i = 0; i < ARRAY_SIZE(wm8958_main_supplies); i++)
 381                         wm8994->supplies[i].supply = wm8958_main_supplies[i];
 382                 break;
 383         default:
 384                 BUG();
 385                 goto err;
 386         }
 387
 388         /*
 389          * Can't use devres helper here as some of the supplies are provided by
 390          * wm8994->dev's children (regulators) and those regulators are
 391          * unregistered by the devres core before the supplies are freed.
 392          */
 393         ret = regulator_bulk_get(wm8994->dev, wm8994->num_supplies,
 394                                  wm8994->supplies);
 395         if (ret != 0) {
 396                 if (ret != -EPROBE_DEFER)
 397                         dev_err(wm8994->dev, "Failed to get supplies: %d\n",
 398                                 ret);
 399                 goto err;
 400         }
 401
 402         ret = regulator_bulk_enable(wm8994->num_supplies, wm8994->supplies);
 403         if (ret != 0) {
 404                 dev_err(wm8994->dev, "Failed to enable supplies: %d\n", ret);
 405                 goto err_regulator_free;
 406         }
 407
 408         ret = wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET);
 409         if (ret < 0) {
 410                 dev_err(wm8994->dev, "Failed to read ID register\n");
 411                 goto err_enable;
 412         }
 413         switch (ret) {
 414         case 0x1811:
 415                 devname = "WM1811";
 416                 if (wm8994->type != WM1811)
 417                         dev_warn(wm8994->dev, "Device registered as type %d\n",
 418                                  wm8994->type);
 419                 wm8994->type = WM1811;
 420                 break;
 421         case 0x8994:
 422                 devname = "WM8994";
 423                 if (wm8994->type != WM8994)
 424                         dev_warn(wm8994->dev, "Device registered as type %d\n",
 425                                  wm8994->type);
 426                 wm8994->type = WM8994;
 427                 break;
 428         case 0x8958:
 429                 devname = "WM8958";
 430                 if (wm8994->type != WM8958)
 431                         dev_warn(wm8994->dev, "Device registered as type %d\n",
 432                                  wm8994->type);
 433                 wm8994->type = WM8958;
 434                 break;
 435         default:
 436                 dev_err(wm8994->dev, "Device is not a WM8994, ID is %x\n",
 437                         ret);
 438                 ret = -EINVAL;
 439                 goto err_enable;
 440         }
 441
 442         ret = wm8994_reg_read(wm8994, WM8994_CHIP_REVISION);
 443         if (ret < 0) {
 444                 dev_err(wm8994->dev, "Failed to read revision register: %d\n",
 445                         ret);
 446                 goto err_enable;
 447         }
 448         wm8994->revision = ret & WM8994_CHIP_REV_MASK;
 449         wm8994->cust_id = (ret & WM8994_CUST_ID_MASK) >> WM8994_CUST_ID_SHIFT;
 450
 451         switch (wm8994->type) {
 452         case WM8994:
 453                 switch (wm8994->revision) {
 454                 case 0:
 455                 case 1:
 456                         dev_warn(wm8994->dev,
 457                                  "revision %c not fully supported\n",
 458                                  'A' + wm8994->revision);
 459                         break;
 460                 case 2:
 461                 case 3:
 462                 default:
 463                         regmap_patch = wm8994_revc_patch;
 464                         patch_regs = ARRAY_SIZE(wm8994_revc_patch);
 465                         break;
 466                 }
 467                 break;
 468
 469         case WM8958:
 470                 switch (wm8994->revision) {
 471                 case 0:
 472                         regmap_patch = wm8958_reva_patch;
 473                         patch_regs = ARRAY_SIZE(wm8958_reva_patch);
 474                         break;
 475                 default:
 476                         break;
 477                 }
 478                 break;
 479
 480         case WM1811:
 481                 /* Revision C did not change the relevant layer */
 482                 if (wm8994->revision > 1)
 483                         wm8994->revision++;
 484
 485                 regmap_patch = wm1811_reva_patch;
 486                 patch_regs = ARRAY_SIZE(wm1811_reva_patch);
 487                 break;
 488
 489         default:
 490                 break;
 491         }
 492
 493         dev_info(wm8994->dev, "%s revision %c CUST_ID %02x\n", devname,
 494                  'A' + wm8994->revision, wm8994->cust_id);
 495
 496         switch (wm8994->type) {
 497         case WM1811:
 498                 regmap_config = &wm1811_regmap_config;
 499                 break;
 500         case WM8994:
 501                 regmap_config = &wm8994_regmap_config;
 502                 break;
 503         case WM8958:
 504                 regmap_config = &wm8958_regmap_config;
 505                 break;
 506         default:
 507                 dev_err(wm8994->dev, "Unknown device type %d\n", wm8994->type);
 508                 ret = -EINVAL;
 509                 goto err_enable;
 510         }
 511
 512         ret = regmap_reinit_cache(wm8994->regmap, regmap_config);
 513         if (ret != 0) {
 514                 dev_err(wm8994->dev, "Failed to reinit register cache: %d\n",
 515                         ret);
 516                 goto err_enable;
 517         }
 518
 519         /* Explicitly put the device into reset in case regulators
 520          * don't get disabled in order to ensure we know the device
 521          * state.
 522          */
 523         ret = wm8994_reg_write(wm8994, WM8994_SOFTWARE_RESET,
 524                                wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET));
 525         if (ret != 0) {
 526                 dev_err(wm8994->dev, "Failed to reset device: %d\n", ret);
 527                 goto err_enable;
 528         }
 529
 530         if (regmap_patch) {
 531                 ret = regmap_register_patch(wm8994->regmap, regmap_patch,
 532                                             patch_regs);
 533                 if (ret != 0) {
 534                         dev_err(wm8994->dev, "Failed to register patch: %d\n",
 535                                 ret);
 536                         goto err_enable;
 537                 }
 538         }
 539
 540         wm8994->irq_base = pdata->irq_base;
 541         wm8994->gpio_base = pdata->gpio_base;
 542
 543         /* GPIO configuration is only applied if it's non-zero */
 544         for (i = 0; i < ARRAY_SIZE(pdata->gpio_defaults); i++) {
 545                 if (pdata->gpio_defaults[i]) {
 546                         wm8994_set_bits(wm8994, WM8994_GPIO_1 + i,
 547                                         0xffff, pdata->gpio_defaults[i]);
 548                 }
 549         }
 550
 551         wm8994->ldo_ena_always_driven = pdata->ldo_ena_always_driven;
 552
 553         if (pdata->spkmode_pu)
 554                 pulls |= WM8994_SPKMODE_PU;
 555         if (pdata->csnaddr_pd)
 556                 pulls |= WM8994_CSNADDR_PD;
 557
 558         /* Disable unneeded pulls */
 559         wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,
 560                         WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD |
 561                         WM8994_SPKMODE_PU | WM8994_CSNADDR_PD,
 562                         pulls);
 563
 564         /* In some system designs where the regulators are not in use,
 565          * we can achieve a small reduction in leakage currents by
 566          * floating LDO outputs.  This bit makes no difference if the
 567          * LDOs are enabled, it only affects cases where the LDOs were
 568          * in operation and are then disabled.
 569          */
 570         for (i = 0; i < WM8994_NUM_LDO_REGS; i++) {
 571                 if (wm8994_ldo_in_use(pdata, i))
 572                         wm8994_set_bits(wm8994, WM8994_LDO_1 + i,
 573                                         WM8994_LDO1_DISCH, WM8994_LDO1_DISCH);
 574                 else
 575                         wm8994_set_bits(wm8994, WM8994_LDO_1 + i,
 576                                         WM8994_LDO1_DISCH, 0);
 577         }
 578
 579         wm8994_irq_init(wm8994);
 580
 581         ret = mfd_add_devices(wm8994->dev, -1,
 582                               wm8994_devs, ARRAY_SIZE(wm8994_devs),
 583                               NULL, 0, NULL);
 584         if (ret != 0) {
 585                 dev_err(wm8994->dev, "Failed to add children: %d\n", ret);
 586                 goto err_irq;
 587         }
 588
 589         pm_runtime_set_active(wm8994->dev);
 590         pm_runtime_enable(wm8994->dev);
 591         pm_runtime_idle(wm8994->dev);
 592
 593         return 0;
 594
 595 err_irq:
 596         wm8994_irq_exit(wm8994);
 597 err_enable:
 598         regulator_bulk_disable(wm8994->num_supplies,
 599                                wm8994->supplies);
 600 err_regulator_free:
 601         regulator_bulk_free(wm8994->num_supplies, wm8994->supplies);
 602 err:
 603         mfd_remove_devices(wm8994->dev);
 604         return ret;
 605 }
 606
 607 static void wm8994_device_exit(struct wm8994 *wm8994)
 608 {
 609         pm_runtime_get_sync(wm8994->dev);
 610         pm_runtime_disable(wm8994->dev);
 611         pm_runtime_put_noidle(wm8994->dev);
 612         wm8994_irq_exit(wm8994);
 613         regulator_bulk_disable(wm8994->num_supplies, wm8994->supplies);
 614         regulator_bulk_free(wm8994->num_supplies, wm8994->supplies);
 615         mfd_remove_devices(wm8994->dev);
 616 }
 617
 618 static const struct of_device_id wm8994_of_match[] = {
 619         { .compatible = "wlf,wm1811", .data = (void *)WM1811 },
 620         { .compatible = "wlf,wm8994", .data = (void *)WM8994 },
 621         { .compatible = "wlf,wm8958", .data = (void *)WM8958 },
 622         { }
 623 };
 624 MODULE_DEVICE_TABLE(of, wm8994_of_match);
 625
 626 static int wm8994_i2c_probe(struct i2c_client *i2c,
 627                                       const struct i2c_device_id *id)
 628 {
 629         const struct of_device_id *of_id;
 630         struct wm8994 *wm8994;
 631         int ret;
 632
 633         wm8994 = devm_kzalloc(&i2c->dev, sizeof(struct wm8994), GFP_KERNEL);
 634         if (wm8994 == NULL)
 635                 return -ENOMEM;
 636
 637         i2c_set_clientdata(i2c, wm8994);
 638         wm8994->dev = &i2c->dev;
 639         wm8994->irq = i2c->irq;
 640
 641         if (i2c->dev.of_node) {
 642                 of_id = of_match_device(wm8994_of_match, &i2c->dev);
 643                 if (of_id)
 644                         wm8994->type = (enum wm8994_type)of_id->data;
 645         } else {
 646                 wm8994->type = id->driver_data;
 647         }
 648
 649         wm8994->regmap = devm_regmap_init_i2c(i2c, &wm8994_base_regmap_config);
 650         if (IS_ERR(wm8994->regmap)) {
 651                 ret = PTR_ERR(wm8994->regmap);
 652                 dev_err(wm8994->dev, "Failed to allocate register map: %d\n",
 653                         ret);
 654                 return ret;
 655         }
 656
 657         return wm8994_device_init(wm8994, i2c->irq);
 658 }
 659
 660 static int wm8994_i2c_remove(struct i2c_client *i2c)
 661 {
 662         struct wm8994 *wm8994 = i2c_get_clientdata(i2c);
 663
 664         wm8994_device_exit(wm8994);
 665
 666         return 0;
 667 }
 668
 669 static const struct i2c_device_id wm8994_i2c_id[] = {
 670         { "wm1811", WM1811 },
 671         { "wm1811a", WM1811 },
 672         { "wm8994", WM8994 },
 673         { "wm8958", WM8958 },
 674         { }
 675 };
 676 MODULE_DEVICE_TABLE(i2c, wm8994_i2c_id);
 677
 678 static const struct dev_pm_ops wm8994_pm_ops = {
 679         SET_RUNTIME_PM_OPS(wm8994_suspend, wm8994_resume, NULL)
 680 };
 681
 682 static struct i2c_driver wm8994_i2c_driver = {
 683         .driver = {
 684                 .name = "wm8994",
 685                 .pm = &wm8994_pm_ops,
 686                 .of_match_table = wm8994_of_match,
 687         },
 688         .probe = wm8994_i2c_probe,
 689         .remove = wm8994_i2c_remove,
 690         .id_table = wm8994_i2c_id,
 691 };
 692
 693 module_i2c_driver(wm8994_i2c_driver);
 694
 695 MODULE_DESCRIPTION("Core support for the WM8994 audio CODEC");
 696 MODULE_LICENSE("GPL");
 697 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 698 MODULE_SOFTDEP("pre: wm8994_regulator");