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 <[email protected]>
   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 = true;
 283         pdata->lineout2_diff = true;
 284         if (of_find_property(np, "wlf,lineout1-se", NULL))
 285                 pdata->lineout1_diff = false;
 286         if (of_find_property(np, "wlf,lineout2-se", NULL))
 287                 pdata->lineout2_diff = false;
 288
 289         if (of_find_property(np, "wlf,lineout1-feedback", NULL))
 290                 pdata->lineout1fb = true;
 291         if (of_find_property(np, "wlf,lineout2-feedback", NULL))
 292                 pdata->lineout2fb = true;
 293
 294         if (of_find_property(np, "wlf,ldoena-always-driven", NULL))
 295                 pdata->lineout2fb = true;
 296
 297         pdata->spkmode_pu = of_property_read_bool(np, "wlf,spkmode-pu");
 298
 299         pdata->csnaddr_pd = of_property_read_bool(np, "wlf,csnaddr-pd");
 300
 301         return 0;
 302 }
 303 #else
 304 static int wm8994_set_pdata_from_of(struct wm8994 *wm8994)
 305 {
 306         return 0;
 307 }
 308 #endif
 309
 310 /*
 311  * Instantiate the generic non-control parts of the device.
 312  */
 313 static int wm8994_device_init(struct wm8994 *wm8994, int irq)
 314 {
 315         struct wm8994_pdata *pdata;
 316         struct regmap_config *regmap_config;
 317         const struct reg_sequence *regmap_patch = NULL;
 318         const char *devname;
 319         int ret, i, patch_regs = 0;
 320         int pulls = 0;
 321
 322         if (dev_get_platdata(wm8994->dev)) {
 323                 pdata = dev_get_platdata(wm8994->dev);
 324                 wm8994->pdata = *pdata;
 325         }
 326         pdata = &wm8994->pdata;
 327
 328         ret = wm8994_set_pdata_from_of(wm8994);
 329         if (ret != 0)
 330                 return ret;
 331
 332         dev_set_drvdata(wm8994->dev, wm8994);
 333
 334         /* Add the on-chip regulators first for bootstrapping */
 335         ret = mfd_add_devices(wm8994->dev, 0,
 336                               wm8994_regulator_devs,
 337                               ARRAY_SIZE(wm8994_regulator_devs),
 338                               NULL, 0, NULL);
 339         if (ret != 0) {
 340                 dev_err(wm8994->dev, "Failed to add children: %d\n", ret);
 341                 goto err;
 342         }
 343
 344         switch (wm8994->type) {
 345         case WM1811:
 346                 wm8994->num_supplies = ARRAY_SIZE(wm1811_main_supplies);
 347                 break;
 348         case WM8994:
 349                 wm8994->num_supplies = ARRAY_SIZE(wm8994_main_supplies);
 350                 break;
 351         case WM8958:
 352                 wm8994->num_supplies = ARRAY_SIZE(wm8958_main_supplies);
 353                 break;
 354         default:
 355                 BUG();
 356                 goto err;
 357         }
 358
 359         wm8994->supplies = devm_kcalloc(wm8994->dev,
 360                                         wm8994->num_supplies,
 361                                         sizeof(struct regulator_bulk_data),
 362                                         GFP_KERNEL);
 363         if (!wm8994->supplies) {
 364                 ret = -ENOMEM;
 365                 goto err;
 366         }
 367
 368         switch (wm8994->type) {
 369         case WM1811:
 370                 for (i = 0; i < ARRAY_SIZE(wm1811_main_supplies); i++)
 371                         wm8994->supplies[i].supply = wm1811_main_supplies[i];
 372                 break;
 373         case WM8994:
 374                 for (i = 0; i < ARRAY_SIZE(wm8994_main_supplies); i++)
 375                         wm8994->supplies[i].supply = wm8994_main_supplies[i];
 376                 break;
 377         case WM8958:
 378                 for (i = 0; i < ARRAY_SIZE(wm8958_main_supplies); i++)
 379                         wm8994->supplies[i].supply = wm8958_main_supplies[i];
 380                 break;
 381         default:
 382                 BUG();
 383                 goto err;
 384         }
 385
 386         /*
 387          * Can't use devres helper here as some of the supplies are provided by
 388          * wm8994->dev's children (regulators) and those regulators are
 389          * unregistered by the devres core before the supplies are freed.
 390          */
 391         ret = regulator_bulk_get(wm8994->dev, wm8994->num_supplies,
 392                                  wm8994->supplies);
 393         if (ret != 0) {
 394                 if (ret != -EPROBE_DEFER)
 395                         dev_err(wm8994->dev, "Failed to get supplies: %d\n",
 396                                 ret);
 397                 goto err;
 398         }
 399
 400         ret = regulator_bulk_enable(wm8994->num_supplies, wm8994->supplies);
 401         if (ret != 0) {
 402                 dev_err(wm8994->dev, "Failed to enable supplies: %d\n", ret);
 403                 goto err_regulator_free;
 404         }
 405
 406         ret = wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET);
 407         if (ret < 0) {
 408                 dev_err(wm8994->dev, "Failed to read ID register\n");
 409                 goto err_enable;
 410         }
 411         switch (ret) {
 412         case 0x1811:
 413                 devname = "WM1811";
 414                 if (wm8994->type != WM1811)
 415                         dev_warn(wm8994->dev, "Device registered as type %d\n",
 416                                  wm8994->type);
 417                 wm8994->type = WM1811;
 418                 break;
 419         case 0x8994:
 420                 devname = "WM8994";
 421                 if (wm8994->type != WM8994)
 422                         dev_warn(wm8994->dev, "Device registered as type %d\n",
 423                                  wm8994->type);
 424                 wm8994->type = WM8994;
 425                 break;
 426         case 0x8958:
 427                 devname = "WM8958";
 428                 if (wm8994->type != WM8958)
 429                         dev_warn(wm8994->dev, "Device registered as type %d\n",
 430                                  wm8994->type);
 431                 wm8994->type = WM8958;
 432                 break;
 433         default:
 434                 dev_err(wm8994->dev, "Device is not a WM8994, ID is %x\n",
 435                         ret);
 436                 ret = -EINVAL;
 437                 goto err_enable;
 438         }
 439
 440         ret = wm8994_reg_read(wm8994, WM8994_CHIP_REVISION);
 441         if (ret < 0) {
 442                 dev_err(wm8994->dev, "Failed to read revision register: %d\n",
 443                         ret);
 444                 goto err_enable;
 445         }
 446         wm8994->revision = ret & WM8994_CHIP_REV_MASK;
 447         wm8994->cust_id = (ret & WM8994_CUST_ID_MASK) >> WM8994_CUST_ID_SHIFT;
 448
 449         switch (wm8994->type) {
 450         case WM8994:
 451                 switch (wm8994->revision) {
 452                 case 0:
 453                 case 1:
 454                         dev_warn(wm8994->dev,
 455                                  "revision %c not fully supported\n",
 456                                  'A' + wm8994->revision);
 457                         break;
 458                 case 2:
 459                 case 3:
 460                 default:
 461                         regmap_patch = wm8994_revc_patch;
 462                         patch_regs = ARRAY_SIZE(wm8994_revc_patch);
 463                         break;
 464                 }
 465                 break;
 466
 467         case WM8958:
 468                 switch (wm8994->revision) {
 469                 case 0:
 470                         regmap_patch = wm8958_reva_patch;
 471                         patch_regs = ARRAY_SIZE(wm8958_reva_patch);
 472                         break;
 473                 default:
 474                         break;
 475                 }
 476                 break;
 477
 478         case WM1811:
 479                 /* Revision C did not change the relevant layer */
 480                 if (wm8994->revision > 1)
 481                         wm8994->revision++;
 482
 483                 regmap_patch = wm1811_reva_patch;
 484                 patch_regs = ARRAY_SIZE(wm1811_reva_patch);
 485                 break;
 486
 487         default:
 488                 break;
 489         }
 490
 491         dev_info(wm8994->dev, "%s revision %c CUST_ID %02x\n", devname,
 492                  'A' + wm8994->revision, wm8994->cust_id);
 493
 494         switch (wm8994->type) {
 495         case WM1811:
 496                 regmap_config = &wm1811_regmap_config;
 497                 break;
 498         case WM8994:
 499                 regmap_config = &wm8994_regmap_config;
 500                 break;
 501         case WM8958:
 502                 regmap_config = &wm8958_regmap_config;
 503                 break;
 504         default:
 505                 dev_err(wm8994->dev, "Unknown device type %d\n", wm8994->type);
 506                 ret = -EINVAL;
 507                 goto err_enable;
 508         }
 509
 510         ret = regmap_reinit_cache(wm8994->regmap, regmap_config);
 511         if (ret != 0) {
 512                 dev_err(wm8994->dev, "Failed to reinit register cache: %d\n",
 513                         ret);
 514                 goto err_enable;
 515         }
 516
 517         /* Explicitly put the device into reset in case regulators
 518          * don't get disabled in order to ensure we know the device
 519          * state.
 520          */
 521         ret = wm8994_reg_write(wm8994, WM8994_SOFTWARE_RESET,
 522                                wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET));
 523         if (ret != 0) {
 524                 dev_err(wm8994->dev, "Failed to reset device: %d\n", ret);
 525                 goto err_enable;
 526         }
 527
 528         if (regmap_patch) {
 529                 ret = regmap_register_patch(wm8994->regmap, regmap_patch,
 530                                             patch_regs);
 531                 if (ret != 0) {
 532                         dev_err(wm8994->dev, "Failed to register patch: %d\n",
 533                                 ret);
 534                         goto err_enable;
 535                 }
 536         }
 537
 538         wm8994->irq_base = pdata->irq_base;
 539         wm8994->gpio_base = pdata->gpio_base;
 540
 541         /* GPIO configuration is only applied if it's non-zero */
 542         for (i = 0; i < ARRAY_SIZE(pdata->gpio_defaults); i++) {
 543                 if (pdata->gpio_defaults[i]) {
 544                         wm8994_set_bits(wm8994, WM8994_GPIO_1 + i,
 545                                         0xffff, pdata->gpio_defaults[i]);
 546                 }
 547         }
 548
 549         wm8994->ldo_ena_always_driven = pdata->ldo_ena_always_driven;
 550
 551         if (pdata->spkmode_pu)
 552                 pulls |= WM8994_SPKMODE_PU;
 553         if (pdata->csnaddr_pd)
 554                 pulls |= WM8994_CSNADDR_PD;
 555
 556         /* Disable unneeded pulls */
 557         wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,
 558                         WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD |
 559                         WM8994_SPKMODE_PU | WM8994_CSNADDR_PD,
 560                         pulls);
 561
 562         /* In some system designs where the regulators are not in use,
 563          * we can achieve a small reduction in leakage currents by
 564          * floating LDO outputs.  This bit makes no difference if the
 565          * LDOs are enabled, it only affects cases where the LDOs were
 566          * in operation and are then disabled.
 567          */
 568         for (i = 0; i < WM8994_NUM_LDO_REGS; i++) {
 569                 if (wm8994_ldo_in_use(pdata, i))
 570                         wm8994_set_bits(wm8994, WM8994_LDO_1 + i,
 571                                         WM8994_LDO1_DISCH, WM8994_LDO1_DISCH);
 572                 else
 573                         wm8994_set_bits(wm8994, WM8994_LDO_1 + i,
 574                                         WM8994_LDO1_DISCH, 0);
 575         }
 576
 577         wm8994_irq_init(wm8994);
 578
 579         ret = mfd_add_devices(wm8994->dev, -1,
 580                               wm8994_devs, ARRAY_SIZE(wm8994_devs),
 581                               NULL, 0, NULL);
 582         if (ret != 0) {
 583                 dev_err(wm8994->dev, "Failed to add children: %d\n", ret);
 584                 goto err_irq;
 585         }
 586
 587         pm_runtime_set_active(wm8994->dev);
 588         pm_runtime_enable(wm8994->dev);
 589         pm_runtime_idle(wm8994->dev);
 590
 591         return 0;
 592
 593 err_irq:
 594         wm8994_irq_exit(wm8994);
 595 err_enable:
 596         regulator_bulk_disable(wm8994->num_supplies,
 597                                wm8994->supplies);
 598 err_regulator_free:
 599         regulator_bulk_free(wm8994->num_supplies, wm8994->supplies);
 600 err:
 601         mfd_remove_devices(wm8994->dev);
 602         return ret;
 603 }
 604
 605 static void wm8994_device_exit(struct wm8994 *wm8994)
 606 {
 607         pm_runtime_get_sync(wm8994->dev);
 608         pm_runtime_disable(wm8994->dev);
 609         pm_runtime_put_noidle(wm8994->dev);
 610         wm8994_irq_exit(wm8994);
 611         regulator_bulk_disable(wm8994->num_supplies, wm8994->supplies);
 612         regulator_bulk_free(wm8994->num_supplies, wm8994->supplies);
 613         mfd_remove_devices(wm8994->dev);
 614 }
 615
 616 static const struct of_device_id wm8994_of_match[] = {
 617         { .compatible = "wlf,wm1811", .data = (void *)WM1811 },
 618         { .compatible = "wlf,wm8994", .data = (void *)WM8994 },
 619         { .compatible = "wlf,wm8958", .data = (void *)WM8958 },
 620         { }
 621 };
 622 MODULE_DEVICE_TABLE(of, wm8994_of_match);
 623
 624 static int wm8994_i2c_probe(struct i2c_client *i2c)
 625 {
 626         const struct i2c_device_id *id = i2c_client_get_device_id(i2c);
 627         const struct of_device_id *of_id;
 628         struct wm8994 *wm8994;
 629         int ret;
 630
 631         wm8994 = devm_kzalloc(&i2c->dev, sizeof(struct wm8994), GFP_KERNEL);
 632         if (wm8994 == NULL)
 633                 return -ENOMEM;
 634
 635         i2c_set_clientdata(i2c, wm8994);
 636         wm8994->dev = &i2c->dev;
 637         wm8994->irq = i2c->irq;
 638
 639         if (i2c->dev.of_node) {
 640                 of_id = of_match_device(wm8994_of_match, &i2c->dev);
 641                 if (of_id)
 642                         wm8994->type = (enum wm8994_type)of_id->data;
 643         } else {
 644                 wm8994->type = id->driver_data;
 645         }
 646
 647         wm8994->regmap = devm_regmap_init_i2c(i2c, &wm8994_base_regmap_config);
 648         if (IS_ERR(wm8994->regmap)) {
 649                 ret = PTR_ERR(wm8994->regmap);
 650                 dev_err(wm8994->dev, "Failed to allocate register map: %d\n",
 651                         ret);
 652                 return ret;
 653         }
 654
 655         return wm8994_device_init(wm8994, i2c->irq);
 656 }
 657
 658 static void wm8994_i2c_remove(struct i2c_client *i2c)
 659 {
 660         struct wm8994 *wm8994 = i2c_get_clientdata(i2c);
 661
 662         wm8994_device_exit(wm8994);
 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 const struct dev_pm_ops wm8994_pm_ops = {
 675         RUNTIME_PM_OPS(wm8994_suspend, wm8994_resume, NULL)
 676 };
 677
 678 static struct i2c_driver wm8994_i2c_driver = {
 679         .driver = {
 680                 .name = "wm8994",
 681                 .pm = pm_ptr(&wm8994_pm_ops),
 682                 .of_match_table = wm8994_of_match,
 683         },
 684         .probe_new = wm8994_i2c_probe,
 685         .remove = wm8994_i2c_remove,
 686         .id_table = wm8994_i2c_id,
 687 };
 688
 689 module_i2c_driver(wm8994_i2c_driver);
 690
 691 MODULE_DESCRIPTION("Core support for the WM8994 audio CODEC");
 692 MODULE_LICENSE("GPL");
 693 MODULE_AUTHOR("Mark Brown <[email protected]>");
 694 MODULE_SOFTDEP("pre: wm8994_regulator");