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 <[email protected]>
   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/of.h>
  23 #include <linux/of_device.h>
  24 #include <linux/of_gpio.h>
  25 #include <linux/pm_runtime.h>
  26 #include <linux/regmap.h>
  27 #include <linux/regulator/consumer.h>
  28 #include <linux/regulator/machine.h>
  29
  30 #include <linux/mfd/wm8994/core.h>
  31 #include <linux/mfd/wm8994/pdata.h>
  32 #include <linux/mfd/wm8994/registers.h>
  33
  34 #include "wm8994.h"
  35
  36 static const struct mfd_cell wm8994_regulator_devs[] = {
  37         {
  38                 .name = "wm8994-ldo",
  39                 .id = 0,
  40                 .pm_runtime_no_callbacks = true,
  41         },
  42         {
  43                 .name = "wm8994-ldo",
  44                 .id = 1,
  45                 .pm_runtime_no_callbacks = true,
  46         },
  47 };
  48
  49 static struct resource wm8994_codec_resources[] = {
  50         {
  51                 .start = WM8994_IRQ_TEMP_SHUT,
  52                 .end   = WM8994_IRQ_TEMP_WARN,
  53                 .flags = IORESOURCE_IRQ,
  54         },
  55 };
  56
  57 static struct resource wm8994_gpio_resources[] = {
  58         {
  59                 .start = WM8994_IRQ_GPIO(1),
  60                 .end   = WM8994_IRQ_GPIO(11),
  61                 .flags = IORESOURCE_IRQ,
  62         },
  63 };
  64
  65 static const struct mfd_cell wm8994_devs[] = {
  66         {
  67                 .name = "wm8994-codec",
  68                 .num_resources = ARRAY_SIZE(wm8994_codec_resources),
  69                 .resources = wm8994_codec_resources,
  70         },
  71
  72         {
  73                 .name = "wm8994-gpio",
  74                 .num_resources = ARRAY_SIZE(wm8994_gpio_resources),
  75                 .resources = wm8994_gpio_resources,
  76                 .pm_runtime_no_callbacks = true,
  77         },
  78 };
  79
  80 /*
  81  * Supplies for the main bulk of CODEC; the LDO supplies are ignored
  82  * and should be handled via the standard regulator API supply
  83  * management.
  84  */
  85 static const char *wm1811_main_supplies[] = {
  86         "DBVDD1",
  87         "DBVDD2",
  88         "DBVDD3",
  89         "DCVDD",
  90         "AVDD1",
  91         "AVDD2",
  92         "CPVDD",
  93         "SPKVDD1",
  94         "SPKVDD2",
  95 };
  96
  97 static const char *wm8994_main_supplies[] = {
  98         "DBVDD",
  99         "DCVDD",
 100         "AVDD1",
 101         "AVDD2",
 102         "CPVDD",
 103         "SPKVDD1",
 104         "SPKVDD2",
 105 };
 106
 107 static const char *wm8958_main_supplies[] = {
 108         "DBVDD1",
 109         "DBVDD2",
 110         "DBVDD3",
 111         "DCVDD",
 112         "AVDD1",
 113         "AVDD2",
 114         "CPVDD",
 115         "SPKVDD1",
 116         "SPKVDD2",
 117 };
 118
 119 #ifdef CONFIG_PM
 120 static int wm8994_suspend(struct device *dev)
 121 {
 122         struct wm8994 *wm8994 = dev_get_drvdata(dev);
 123         int ret;
 124
 125         /* Don't actually go through with the suspend if the CODEC is
 126          * still active for accessory detect. */
 127         switch (wm8994->type) {
 128         case WM8958:
 129         case WM1811:
 130                 ret = wm8994_reg_read(wm8994, WM8958_MIC_DETECT_1);
 131                 if (ret < 0) {
 132                         dev_err(dev, "Failed to read power status: %d\n", ret);
 133                 } else if (ret & WM8958_MICD_ENA) {
 134                         dev_dbg(dev, "CODEC still active, ignoring suspend\n");
 135                         return 0;
 136                 }
 137                 break;
 138         default:
 139                 break;
 140         }
 141
 142         /* Disable LDO pulldowns while the device is suspended if we
 143          * don't know that something will be driving them. */
 144         if (!wm8994->ldo_ena_always_driven)
 145                 wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,
 146                                 WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD,
 147                                 WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD);
 148
 149         /* Explicitly put the device into reset in case regulators
 150          * don't get disabled in order to ensure consistent restart.
 151          */
 152         wm8994_reg_write(wm8994, WM8994_SOFTWARE_RESET,
 153                          wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET));
 154
 155         regcache_mark_dirty(wm8994->regmap);
 156
 157         /* Restore GPIO registers to prevent problems with mismatched
 158          * pin configurations.
 159          */
 160         ret = regcache_sync_region(wm8994->regmap, WM8994_GPIO_1,
 161                                    WM8994_GPIO_11);
 162         if (ret != 0)
 163                 dev_err(dev, "Failed to restore GPIO registers: %d\n", ret);
 164
 165         /* In case one of the GPIOs is used as a wake input. */
 166         ret = regcache_sync_region(wm8994->regmap,
 167                                    WM8994_INTERRUPT_STATUS_1_MASK,
 168                                    WM8994_INTERRUPT_STATUS_1_MASK);
 169         if (ret != 0)
 170                 dev_err(dev, "Failed to restore interrupt mask: %d\n", ret);
 171
 172         regcache_cache_only(wm8994->regmap, true);
 173         wm8994->suspended = true;
 174
 175         ret = regulator_bulk_disable(wm8994->num_supplies,
 176                                      wm8994->supplies);
 177         if (ret != 0) {
 178                 dev_err(dev, "Failed to disable supplies: %d\n", ret);
 179                 return ret;
 180         }
 181
 182         return 0;
 183 }
 184
 185 static int wm8994_resume(struct device *dev)
 186 {
 187         struct wm8994 *wm8994 = dev_get_drvdata(dev);
 188         int ret;
 189
 190         /* We may have lied to the PM core about suspending */
 191         if (!wm8994->suspended)
 192                 return 0;
 193
 194         ret = regulator_bulk_enable(wm8994->num_supplies,
 195                                     wm8994->supplies);
 196         if (ret != 0) {
 197                 dev_err(dev, "Failed to enable supplies: %d\n", ret);
 198                 return ret;
 199         }
 200
 201         regcache_cache_only(wm8994->regmap, false);
 202         ret = regcache_sync(wm8994->regmap);
 203         if (ret != 0) {
 204                 dev_err(dev, "Failed to restore register map: %d\n", ret);
 205                 goto err_enable;
 206         }
 207
 208         /* Disable LDO pulldowns while the device is active */
 209         wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,
 210                         WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD,
 211                         0);
 212
 213         wm8994->suspended = false;
 214
 215         return 0;
 216
 217 err_enable:
 218         regulator_bulk_disable(wm8994->num_supplies, wm8994->supplies);
 219
 220         return ret;
 221 }
 222 #endif
 223
 224 #ifdef CONFIG_REGULATOR
 225 static int wm8994_ldo_in_use(struct wm8994_pdata *pdata, int ldo)
 226 {
 227         struct wm8994_ldo_pdata *ldo_pdata;
 228
 229         if (!pdata)
 230                 return 0;
 231
 232         ldo_pdata = &pdata->ldo[ldo];
 233
 234         if (!ldo_pdata->init_data)
 235                 return 0;
 236
 237         return ldo_pdata->init_data->num_consumer_supplies != 0;
 238 }
 239 #else
 240 static int wm8994_ldo_in_use(struct wm8994_pdata *pdata, int ldo)
 241 {
 242         return 0;
 243 }
 244 #endif
 245
 246 static const struct reg_sequence wm8994_revc_patch[] = {
 247         { 0x102, 0x3 },
 248         { 0x56, 0x3 },
 249         { 0x817, 0x0 },
 250         { 0x102, 0x0 },
 251 };
 252
 253 static const struct reg_sequence wm8958_reva_patch[] = {
 254         { 0x102, 0x3 },
 255         { 0xcb, 0x81 },
 256         { 0x817, 0x0 },
 257         { 0x102, 0x0 },
 258 };
 259
 260 static const struct reg_sequence wm1811_reva_patch[] = {
 261         { 0x102, 0x3 },
 262         { 0x56, 0xc07 },
 263         { 0x5d, 0x7e },
 264         { 0x5e, 0x0 },
 265         { 0x102, 0x0 },
 266 };
 267
 268 #ifdef CONFIG_OF
 269 static int wm8994_set_pdata_from_of(struct wm8994 *wm8994)
 270 {
 271         struct device_node *np = wm8994->dev->of_node;
 272         struct wm8994_pdata *pdata = &wm8994->pdata;
 273         int i;
 274
 275         if (!np)
 276                 return 0;
 277
 278         if (of_property_read_u32_array(np, "wlf,gpio-cfg", pdata->gpio_defaults,
 279                                        ARRAY_SIZE(pdata->gpio_defaults)) >= 0) {
 280                 for (i = 0; i < ARRAY_SIZE(pdata->gpio_defaults); i++) {
 281                         if (wm8994->pdata.gpio_defaults[i] == 0)
 282                                 pdata->gpio_defaults[i]
 283                                         = WM8994_CONFIGURE_GPIO;
 284                 }
 285         }
 286
 287         of_property_read_u32_array(np, "wlf,micbias-cfg", pdata->micbias,
 288                                    ARRAY_SIZE(pdata->micbias));
 289
 290         pdata->lineout1_diff = true;
 291         pdata->lineout2_diff = true;
 292         if (of_find_property(np, "wlf,lineout1-se", NULL))
 293                 pdata->lineout1_diff = false;
 294         if (of_find_property(np, "wlf,lineout2-se", NULL))
 295                 pdata->lineout2_diff = false;
 296
 297         if (of_find_property(np, "wlf,lineout1-feedback", NULL))
 298                 pdata->lineout1fb = true;
 299         if (of_find_property(np, "wlf,lineout2-feedback", NULL))
 300                 pdata->lineout2fb = true;
 301
 302         if (of_find_property(np, "wlf,ldoena-always-driven", NULL))
 303                 pdata->lineout2fb = true;
 304
 305         pdata->ldo[0].enable = of_get_named_gpio(np, "wlf,ldo1ena", 0);
 306         if (pdata->ldo[0].enable < 0)
 307                 pdata->ldo[0].enable = 0;
 308
 309         pdata->ldo[1].enable = of_get_named_gpio(np, "wlf,ldo2ena", 0);
 310         if (pdata->ldo[1].enable < 0)
 311                 pdata->ldo[1].enable = 0;
 312
 313         return 0;
 314 }
 315 #else
 316 static int wm8994_set_pdata_from_of(struct wm8994 *wm8994)
 317 {
 318         return 0;
 319 }
 320 #endif
 321
 322 /*
 323  * Instantiate the generic non-control parts of the device.
 324  */
 325 static int wm8994_device_init(struct wm8994 *wm8994, int irq)
 326 {
 327         struct wm8994_pdata *pdata;
 328         struct regmap_config *regmap_config;
 329         const struct reg_sequence *regmap_patch = NULL;
 330         const char *devname;
 331         int ret, i, patch_regs = 0;
 332         int pulls = 0;
 333
 334         if (dev_get_platdata(wm8994->dev)) {
 335                 pdata = dev_get_platdata(wm8994->dev);
 336                 wm8994->pdata = *pdata;
 337         }
 338         pdata = &wm8994->pdata;
 339
 340         ret = wm8994_set_pdata_from_of(wm8994);
 341         if (ret != 0)
 342                 return ret;
 343
 344         dev_set_drvdata(wm8994->dev, wm8994);
 345
 346         /* Add the on-chip regulators first for bootstrapping */
 347         ret = mfd_add_devices(wm8994->dev, 0,
 348                               wm8994_regulator_devs,
 349                               ARRAY_SIZE(wm8994_regulator_devs),
 350                               NULL, 0, NULL);
 351         if (ret != 0) {
 352                 dev_err(wm8994->dev, "Failed to add children: %d\n", ret);
 353                 goto err;
 354         }
 355
 356         switch (wm8994->type) {
 357         case WM1811:
 358                 wm8994->num_supplies = ARRAY_SIZE(wm1811_main_supplies);
 359                 break;
 360         case WM8994:
 361                 wm8994->num_supplies = ARRAY_SIZE(wm8994_main_supplies);
 362                 break;
 363         case WM8958:
 364                 wm8994->num_supplies = ARRAY_SIZE(wm8958_main_supplies);
 365                 break;
 366         default:
 367                 BUG();
 368                 goto err;
 369         }
 370
 371         wm8994->supplies = devm_kcalloc(wm8994->dev,
 372                                         wm8994->num_supplies,
 373                                         sizeof(struct regulator_bulk_data),
 374                                         GFP_KERNEL);
 375         if (!wm8994->supplies) {
 376                 ret = -ENOMEM;
 377                 goto err;
 378         }
 379
 380         switch (wm8994->type) {
 381         case WM1811:
 382                 for (i = 0; i < ARRAY_SIZE(wm1811_main_supplies); i++)
 383                         wm8994->supplies[i].supply = wm1811_main_supplies[i];
 384                 break;
 385         case WM8994:
 386                 for (i = 0; i < ARRAY_SIZE(wm8994_main_supplies); i++)
 387                         wm8994->supplies[i].supply = wm8994_main_supplies[i];
 388                 break;
 389         case WM8958:
 390                 for (i = 0; i < ARRAY_SIZE(wm8958_main_supplies); i++)
 391                         wm8994->supplies[i].supply = wm8958_main_supplies[i];
 392                 break;
 393         default:
 394                 BUG();
 395                 goto err;
 396         }
 397
 398         /*
 399          * Can't use devres helper here as some of the supplies are provided by
 400          * wm8994->dev's children (regulators) and those regulators are
 401          * unregistered by the devres core before the supplies are freed.
 402          */
 403         ret = regulator_bulk_get(wm8994->dev, wm8994->num_supplies,
 404                                  wm8994->supplies);
 405         if (ret != 0) {
 406                 dev_err(wm8994->dev, "Failed to get supplies: %d\n", ret);
 407                 goto err;
 408         }
 409
 410         ret = regulator_bulk_enable(wm8994->num_supplies, wm8994->supplies);
 411         if (ret != 0) {
 412                 dev_err(wm8994->dev, "Failed to enable supplies: %d\n", ret);
 413                 goto err_regulator_free;
 414         }
 415
 416         ret = wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET);
 417         if (ret < 0) {
 418                 dev_err(wm8994->dev, "Failed to read ID register\n");
 419                 goto err_enable;
 420         }
 421         switch (ret) {
 422         case 0x1811:
 423                 devname = "WM1811";
 424                 if (wm8994->type != WM1811)
 425                         dev_warn(wm8994->dev, "Device registered as type %d\n",
 426                                  wm8994->type);
 427                 wm8994->type = WM1811;
 428                 break;
 429         case 0x8994:
 430                 devname = "WM8994";
 431                 if (wm8994->type != WM8994)
 432                         dev_warn(wm8994->dev, "Device registered as type %d\n",
 433                                  wm8994->type);
 434                 wm8994->type = WM8994;
 435                 break;
 436         case 0x8958:
 437                 devname = "WM8958";
 438                 if (wm8994->type != WM8958)
 439                         dev_warn(wm8994->dev, "Device registered as type %d\n",
 440                                  wm8994->type);
 441                 wm8994->type = WM8958;
 442                 break;
 443         default:
 444                 dev_err(wm8994->dev, "Device is not a WM8994, ID is %x\n",
 445                         ret);
 446                 ret = -EINVAL;
 447                 goto err_enable;
 448         }
 449
 450         ret = wm8994_reg_read(wm8994, WM8994_CHIP_REVISION);
 451         if (ret < 0) {
 452                 dev_err(wm8994->dev, "Failed to read revision register: %d\n",
 453                         ret);
 454                 goto err_enable;
 455         }
 456         wm8994->revision = ret & WM8994_CHIP_REV_MASK;
 457         wm8994->cust_id = (ret & WM8994_CUST_ID_MASK) >> WM8994_CUST_ID_SHIFT;
 458
 459         switch (wm8994->type) {
 460         case WM8994:
 461                 switch (wm8994->revision) {
 462                 case 0:
 463                 case 1:
 464                         dev_warn(wm8994->dev,
 465                                  "revision %c not fully supported\n",
 466                                  'A' + wm8994->revision);
 467                         break;
 468                 case 2:
 469                 case 3:
 470                 default:
 471                         regmap_patch = wm8994_revc_patch;
 472                         patch_regs = ARRAY_SIZE(wm8994_revc_patch);
 473                         break;
 474                 }
 475                 break;
 476
 477         case WM8958:
 478                 switch (wm8994->revision) {
 479                 case 0:
 480                         regmap_patch = wm8958_reva_patch;
 481                         patch_regs = ARRAY_SIZE(wm8958_reva_patch);
 482                         break;
 483                 default:
 484                         break;
 485                 }
 486                 break;
 487
 488         case WM1811:
 489                 /* Revision C did not change the relevant layer */
 490                 if (wm8994->revision > 1)
 491                         wm8994->revision++;
 492
 493                 regmap_patch = wm1811_reva_patch;
 494                 patch_regs = ARRAY_SIZE(wm1811_reva_patch);
 495                 break;
 496
 497         default:
 498                 break;
 499         }
 500
 501         dev_info(wm8994->dev, "%s revision %c CUST_ID %02x\n", devname,
 502                  'A' + wm8994->revision, wm8994->cust_id);
 503
 504         switch (wm8994->type) {
 505         case WM1811:
 506                 regmap_config = &wm1811_regmap_config;
 507                 break;
 508         case WM8994:
 509                 regmap_config = &wm8994_regmap_config;
 510                 break;
 511         case WM8958:
 512                 regmap_config = &wm8958_regmap_config;
 513                 break;
 514         default:
 515                 dev_err(wm8994->dev, "Unknown device type %d\n", wm8994->type);
 516                 return -EINVAL;
 517         }
 518
 519         ret = regmap_reinit_cache(wm8994->regmap, regmap_config);
 520         if (ret != 0) {
 521                 dev_err(wm8994->dev, "Failed to reinit register cache: %d\n",
 522                         ret);
 523                 return ret;
 524         }
 525
 526         /* Explicitly put the device into reset in case regulators
 527          * don't get disabled in order to ensure we know the device
 528          * state.
 529          */
 530         ret = wm8994_reg_write(wm8994, WM8994_SOFTWARE_RESET,
 531                                wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET));
 532         if (ret != 0) {
 533                 dev_err(wm8994->dev, "Failed to reset device: %d\n", ret);
 534                 return ret;
 535         }
 536
 537         if (regmap_patch) {
 538                 ret = regmap_register_patch(wm8994->regmap, regmap_patch,
 539                                             patch_regs);
 540                 if (ret != 0) {
 541                         dev_err(wm8994->dev, "Failed to register patch: %d\n",
 542                                 ret);
 543                         goto err;
 544                 }
 545         }
 546
 547         wm8994->irq_base = pdata->irq_base;
 548         wm8994->gpio_base = pdata->gpio_base;
 549
 550         /* GPIO configuration is only applied if it's non-zero */
 551         for (i = 0; i < ARRAY_SIZE(pdata->gpio_defaults); i++) {
 552                 if (pdata->gpio_defaults[i]) {
 553                         wm8994_set_bits(wm8994, WM8994_GPIO_1 + i,
 554                                         0xffff, pdata->gpio_defaults[i]);
 555                 }
 556         }
 557
 558         wm8994->ldo_ena_always_driven = pdata->ldo_ena_always_driven;
 559
 560         if (pdata->spkmode_pu)
 561                 pulls |= WM8994_SPKMODE_PU;
 562
 563         /* Disable unneeded pulls */
 564         wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,
 565                         WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD |
 566                         WM8994_SPKMODE_PU | WM8994_CSNADDR_PD,
 567                         pulls);
 568
 569         /* In some system designs where the regulators are not in use,
 570          * we can achieve a small reduction in leakage currents by
 571          * floating LDO outputs.  This bit makes no difference if the
 572          * LDOs are enabled, it only affects cases where the LDOs were
 573          * in operation and are then disabled.
 574          */
 575         for (i = 0; i < WM8994_NUM_LDO_REGS; i++) {
 576                 if (wm8994_ldo_in_use(pdata, i))
 577                         wm8994_set_bits(wm8994, WM8994_LDO_1 + i,
 578                                         WM8994_LDO1_DISCH, WM8994_LDO1_DISCH);
 579                 else
 580                         wm8994_set_bits(wm8994, WM8994_LDO_1 + i,
 581                                         WM8994_LDO1_DISCH, 0);
 582         }
 583
 584         wm8994_irq_init(wm8994);
 585
 586         ret = mfd_add_devices(wm8994->dev, -1,
 587                               wm8994_devs, ARRAY_SIZE(wm8994_devs),
 588                               NULL, 0, NULL);
 589         if (ret != 0) {
 590                 dev_err(wm8994->dev, "Failed to add children: %d\n", ret);
 591                 goto err_irq;
 592         }
 593
 594         pm_runtime_enable(wm8994->dev);
 595         pm_runtime_idle(wm8994->dev);
 596
 597         return 0;
 598
 599 err_irq:
 600         wm8994_irq_exit(wm8994);
 601 err_enable:
 602         regulator_bulk_disable(wm8994->num_supplies,
 603                                wm8994->supplies);
 604 err_regulator_free:
 605         regulator_bulk_free(wm8994->num_supplies, wm8994->supplies);
 606 err:
 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         wm8994_irq_exit(wm8994);
 615         regulator_bulk_disable(wm8994->num_supplies, wm8994->supplies);
 616         regulator_bulk_free(wm8994->num_supplies, wm8994->supplies);
 617         mfd_remove_devices(wm8994->dev);
 618 }
 619
 620 static const struct of_device_id wm8994_of_match[] = {
 621         { .compatible = "wlf,wm1811", .data = (void *)WM1811 },
 622         { .compatible = "wlf,wm8994", .data = (void *)WM8994 },
 623         { .compatible = "wlf,wm8958", .data = (void *)WM8958 },
 624         { }
 625 };
 626 MODULE_DEVICE_TABLE(of, wm8994_of_match);
 627
 628 static int wm8994_i2c_probe(struct i2c_client *i2c,
 629                                       const struct i2c_device_id *id)
 630 {
 631         const struct of_device_id *of_id;
 632         struct wm8994 *wm8994;
 633         int ret;
 634
 635         wm8994 = devm_kzalloc(&i2c->dev, sizeof(struct wm8994), GFP_KERNEL);
 636         if (wm8994 == NULL)
 637                 return -ENOMEM;
 638
 639         i2c_set_clientdata(i2c, wm8994);
 640         wm8994->dev = &i2c->dev;
 641         wm8994->irq = i2c->irq;
 642
 643         if (i2c->dev.of_node) {
 644                 of_id = of_match_device(wm8994_of_match, &i2c->dev);
 645                 if (of_id)
 646                         wm8994->type = (enum wm8994_type)of_id->data;
 647         } else {
 648                 wm8994->type = id->driver_data;
 649         }
 650
 651         wm8994->regmap = devm_regmap_init_i2c(i2c, &wm8994_base_regmap_config);
 652         if (IS_ERR(wm8994->regmap)) {
 653                 ret = PTR_ERR(wm8994->regmap);
 654                 dev_err(wm8994->dev, "Failed to allocate register map: %d\n",
 655                         ret);
 656                 return ret;
 657         }
 658
 659         return wm8994_device_init(wm8994, i2c->irq);
 660 }
 661
 662 static int wm8994_i2c_remove(struct i2c_client *i2c)
 663 {
 664         struct wm8994 *wm8994 = i2c_get_clientdata(i2c);
 665
 666         wm8994_device_exit(wm8994);
 667
 668         return 0;
 669 }
 670
 671 static const struct i2c_device_id wm8994_i2c_id[] = {
 672         { "wm1811", WM1811 },
 673         { "wm1811a", WM1811 },
 674         { "wm8994", WM8994 },
 675         { "wm8958", WM8958 },
 676         { }
 677 };
 678 MODULE_DEVICE_TABLE(i2c, wm8994_i2c_id);
 679
 680 static const struct dev_pm_ops wm8994_pm_ops = {
 681         SET_RUNTIME_PM_OPS(wm8994_suspend, wm8994_resume, NULL)
 682 };
 683
 684 static struct i2c_driver wm8994_i2c_driver = {
 685         .driver = {
 686                 .name = "wm8994",
 687                 .pm = &wm8994_pm_ops,
 688                 .of_match_table = of_match_ptr(wm8994_of_match),
 689         },
 690         .probe = wm8994_i2c_probe,
 691         .remove = wm8994_i2c_remove,
 692         .id_table = wm8994_i2c_id,
 693 };
 694
 695 module_i2c_driver(wm8994_i2c_driver);
 696
 697 MODULE_DESCRIPTION("Core support for the WM8994 audio CODEC");
 698 MODULE_LICENSE("GPL");
 699 MODULE_AUTHOR("Mark Brown <[email protected]>");