drivers/mfd/wm8994-core.c

   1 /*
   2  * wm8994-core.c  --  Device access for Wolfson WM8994
   3  *
   4  * Copyright 2009 Wolfson Microelectronics PLC.
   5  *
   6  * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
   7  *
   8  *  This program is free software; you can redistribute  it and/or modify it
   9  *  under  the terms of  the GNU General  Public License as published by the
  10  *  Free Software Foundation;  either version 2 of the  License, or (at your
  11  *  option) any later version.
  12  *
  13  */
  14
  15 #include <linux/kernel.h>
  16 #include <linux/module.h>
  17 #include <linux/slab.h>
  18 #include <linux/i2c.h>
  19 #include <linux/err.h>
  20 #include <linux/delay.h>
  21 #include <linux/mfd/core.h>
  22 #include <linux/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_kzalloc(wm8994->dev,
 372                                         sizeof(struct regulator_bulk_data) *
 373                                         wm8994->num_supplies, GFP_KERNEL);
 374         if (!wm8994->supplies) {
 375                 ret = -ENOMEM;
 376                 goto err;
 377         }
 378
 379         switch (wm8994->type) {
 380         case WM1811:
 381                 for (i = 0; i < ARRAY_SIZE(wm1811_main_supplies); i++)
 382                         wm8994->supplies[i].supply = wm1811_main_supplies[i];
 383                 break;
 384         case WM8994:
 385                 for (i = 0; i < ARRAY_SIZE(wm8994_main_supplies); i++)
 386                         wm8994->supplies[i].supply = wm8994_main_supplies[i];
 387                 break;
 388         case WM8958:
 389                 for (i = 0; i < ARRAY_SIZE(wm8958_main_supplies); i++)
 390                         wm8994->supplies[i].supply = wm8958_main_supplies[i];
 391                 break;
 392         default:
 393                 BUG();
 394                 goto err;
 395         }
 396
 397         /*
 398          * Can't use devres helper here as some of the supplies are provided by
 399          * wm8994->dev's children (regulators) and those regulators are
 400          * unregistered by the devres core before the supplies are freed.
 401          */
 402         ret = regulator_bulk_get(wm8994->dev, wm8994->num_supplies,
 403                                  wm8994->supplies);
 404         if (ret != 0) {
 405                 dev_err(wm8994->dev, "Failed to get supplies: %d\n", ret);
 406                 goto err;
 407         }
 408
 409         ret = regulator_bulk_enable(wm8994->num_supplies, wm8994->supplies);
 410         if (ret != 0) {
 411                 dev_err(wm8994->dev, "Failed to enable supplies: %d\n", ret);
 412                 goto err_regulator_free;
 413         }
 414
 415         ret = wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET);
 416         if (ret < 0) {
 417                 dev_err(wm8994->dev, "Failed to read ID register\n");
 418                 goto err_enable;
 419         }
 420         switch (ret) {
 421         case 0x1811:
 422                 devname = "WM1811";
 423                 if (wm8994->type != WM1811)
 424                         dev_warn(wm8994->dev, "Device registered as type %d\n",
 425                                  wm8994->type);
 426                 wm8994->type = WM1811;
 427                 break;
 428         case 0x8994:
 429                 devname = "WM8994";
 430                 if (wm8994->type != WM8994)
 431                         dev_warn(wm8994->dev, "Device registered as type %d\n",
 432                                  wm8994->type);
 433                 wm8994->type = WM8994;
 434                 break;
 435         case 0x8958:
 436                 devname = "WM8958";
 437                 if (wm8994->type != WM8958)
 438                         dev_warn(wm8994->dev, "Device registered as type %d\n",
 439                                  wm8994->type);
 440                 wm8994->type = WM8958;
 441                 break;
 442         default:
 443                 dev_err(wm8994->dev, "Device is not a WM8994, ID is %x\n",
 444                         ret);
 445                 ret = -EINVAL;
 446                 goto err_enable;
 447         }
 448
 449         ret = wm8994_reg_read(wm8994, WM8994_CHIP_REVISION);
 450         if (ret < 0) {
 451                 dev_err(wm8994->dev, "Failed to read revision register: %d\n",
 452                         ret);
 453                 goto err_enable;
 454         }
 455         wm8994->revision = ret & WM8994_CHIP_REV_MASK;
 456         wm8994->cust_id = (ret & WM8994_CUST_ID_MASK) >> WM8994_CUST_ID_SHIFT;
 457
 458         switch (wm8994->type) {
 459         case WM8994:
 460                 switch (wm8994->revision) {
 461                 case 0:
 462                 case 1:
 463                         dev_warn(wm8994->dev,
 464                                  "revision %c not fully supported\n",
 465                                  'A' + wm8994->revision);
 466                         break;
 467                 case 2:
 468                 case 3:
 469                 default:
 470                         regmap_patch = wm8994_revc_patch;
 471                         patch_regs = ARRAY_SIZE(wm8994_revc_patch);
 472                         break;
 473                 }
 474                 break;
 475
 476         case WM8958:
 477                 switch (wm8994->revision) {
 478                 case 0:
 479                         regmap_patch = wm8958_reva_patch;
 480                         patch_regs = ARRAY_SIZE(wm8958_reva_patch);
 481                         break;
 482                 default:
 483                         break;
 484                 }
 485                 break;
 486
 487         case WM1811:
 488                 /* Revision C did not change the relevant layer */
 489                 if (wm8994->revision > 1)
 490                         wm8994->revision++;
 491
 492                 regmap_patch = wm1811_reva_patch;
 493                 patch_regs = ARRAY_SIZE(wm1811_reva_patch);
 494                 break;
 495
 496         default:
 497                 break;
 498         }
 499
 500         dev_info(wm8994->dev, "%s revision %c CUST_ID %02x\n", devname,
 501                  'A' + wm8994->revision, wm8994->cust_id);
 502
 503         switch (wm8994->type) {
 504         case WM1811:
 505                 regmap_config = &wm1811_regmap_config;
 506                 break;
 507         case WM8994:
 508                 regmap_config = &wm8994_regmap_config;
 509                 break;
 510         case WM8958:
 511                 regmap_config = &wm8958_regmap_config;
 512                 break;
 513         default:
 514                 dev_err(wm8994->dev, "Unknown device type %d\n", wm8994->type);
 515                 return -EINVAL;
 516         }
 517
 518         ret = regmap_reinit_cache(wm8994->regmap, regmap_config);
 519         if (ret != 0) {
 520                 dev_err(wm8994->dev, "Failed to reinit register cache: %d\n",
 521                         ret);
 522                 return ret;
 523         }
 524
 525         /* Explicitly put the device into reset in case regulators
 526          * don't get disabled in order to ensure we know the device
 527          * state.
 528          */
 529         ret = wm8994_reg_write(wm8994, WM8994_SOFTWARE_RESET,
 530                                wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET));
 531         if (ret != 0) {
 532                 dev_err(wm8994->dev, "Failed to reset device: %d\n", ret);
 533                 return ret;
 534         }
 535
 536         if (regmap_patch) {
 537                 ret = regmap_register_patch(wm8994->regmap, regmap_patch,
 538                                             patch_regs);
 539                 if (ret != 0) {
 540                         dev_err(wm8994->dev, "Failed to register patch: %d\n",
 541                                 ret);
 542                         goto err;
 543                 }
 544         }
 545
 546         wm8994->irq_base = pdata->irq_base;
 547         wm8994->gpio_base = pdata->gpio_base;
 548
 549         /* GPIO configuration is only applied if it's non-zero */
 550         for (i = 0; i < ARRAY_SIZE(pdata->gpio_defaults); i++) {
 551                 if (pdata->gpio_defaults[i]) {
 552                         wm8994_set_bits(wm8994, WM8994_GPIO_1 + i,
 553                                         0xffff, pdata->gpio_defaults[i]);
 554                 }
 555         }
 556
 557         wm8994->ldo_ena_always_driven = pdata->ldo_ena_always_driven;
 558
 559         if (pdata->spkmode_pu)
 560                 pulls |= WM8994_SPKMODE_PU;
 561
 562         /* Disable unneeded pulls */
 563         wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,
 564                         WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD |
 565                         WM8994_SPKMODE_PU | WM8994_CSNADDR_PD,
 566                         pulls);
 567
 568         /* In some system designs where the regulators are not in use,
 569          * we can achieve a small reduction in leakage currents by
 570          * floating LDO outputs.  This bit makes no difference if the
 571          * LDOs are enabled, it only affects cases where the LDOs were
 572          * in operation and are then disabled.
 573          */
 574         for (i = 0; i < WM8994_NUM_LDO_REGS; i++) {
 575                 if (wm8994_ldo_in_use(pdata, i))
 576                         wm8994_set_bits(wm8994, WM8994_LDO_1 + i,
 577                                         WM8994_LDO1_DISCH, WM8994_LDO1_DISCH);
 578                 else
 579                         wm8994_set_bits(wm8994, WM8994_LDO_1 + i,
 580                                         WM8994_LDO1_DISCH, 0);
 581         }
 582
 583         wm8994_irq_init(wm8994);
 584
 585         ret = mfd_add_devices(wm8994->dev, -1,
 586                               wm8994_devs, ARRAY_SIZE(wm8994_devs),
 587                               NULL, 0, NULL);
 588         if (ret != 0) {
 589                 dev_err(wm8994->dev, "Failed to add children: %d\n", ret);
 590                 goto err_irq;
 591         }
 592
 593         pm_runtime_enable(wm8994->dev);
 594         pm_runtime_idle(wm8994->dev);
 595
 596         return 0;
 597
 598 err_irq:
 599         wm8994_irq_exit(wm8994);
 600 err_enable:
 601         regulator_bulk_disable(wm8994->num_supplies,
 602                                wm8994->supplies);
 603 err_regulator_free:
 604         regulator_bulk_free(wm8994->num_supplies, wm8994->supplies);
 605 err:
 606         mfd_remove_devices(wm8994->dev);
 607         return ret;
 608 }
 609
 610 static void wm8994_device_exit(struct wm8994 *wm8994)
 611 {
 612         pm_runtime_disable(wm8994->dev);
 613         wm8994_irq_exit(wm8994);
 614         regulator_bulk_disable(wm8994->num_supplies, wm8994->supplies);
 615         regulator_bulk_free(wm8994->num_supplies, wm8994->supplies);
 616         mfd_remove_devices(wm8994->dev);
 617 }
 618
 619 static const struct of_device_id wm8994_of_match[] = {
 620         { .compatible = "wlf,wm1811", .data = (void *)WM1811 },
 621         { .compatible = "wlf,wm8994", .data = (void *)WM8994 },
 622         { .compatible = "wlf,wm8958", .data = (void *)WM8958 },
 623         { }
 624 };
 625 MODULE_DEVICE_TABLE(of, wm8994_of_match);
 626
 627 static int wm8994_i2c_probe(struct i2c_client *i2c,
 628                                       const struct i2c_device_id *id)
 629 {
 630         const struct of_device_id *of_id;
 631         struct wm8994 *wm8994;
 632         int ret;
 633
 634         wm8994 = devm_kzalloc(&i2c->dev, sizeof(struct wm8994), GFP_KERNEL);
 635         if (wm8994 == NULL)
 636                 return -ENOMEM;
 637
 638         i2c_set_clientdata(i2c, wm8994);
 639         wm8994->dev = &i2c->dev;
 640         wm8994->irq = i2c->irq;
 641
 642         if (i2c->dev.of_node) {
 643                 of_id = of_match_device(wm8994_of_match, &i2c->dev);
 644                 if (of_id)
 645                         wm8994->type = (enum wm8994_type)of_id->data;
 646         } else {
 647                 wm8994->type = id->driver_data;
 648         }
 649
 650         wm8994->regmap = devm_regmap_init_i2c(i2c, &wm8994_base_regmap_config);
 651         if (IS_ERR(wm8994->regmap)) {
 652                 ret = PTR_ERR(wm8994->regmap);
 653                 dev_err(wm8994->dev, "Failed to allocate register map: %d\n",
 654                         ret);
 655                 return ret;
 656         }
 657
 658         return wm8994_device_init(wm8994, i2c->irq);
 659 }
 660
 661 static int wm8994_i2c_remove(struct i2c_client *i2c)
 662 {
 663         struct wm8994 *wm8994 = i2c_get_clientdata(i2c);
 664
 665         wm8994_device_exit(wm8994);
 666
 667         return 0;
 668 }
 669
 670 static const struct i2c_device_id wm8994_i2c_id[] = {
 671         { "wm1811", WM1811 },
 672         { "wm1811a", WM1811 },
 673         { "wm8994", WM8994 },
 674         { "wm8958", WM8958 },
 675         { }
 676 };
 677 MODULE_DEVICE_TABLE(i2c, wm8994_i2c_id);
 678
 679 static const struct dev_pm_ops wm8994_pm_ops = {
 680         SET_RUNTIME_PM_OPS(wm8994_suspend, wm8994_resume, NULL)
 681 };
 682
 683 static struct i2c_driver wm8994_i2c_driver = {
 684         .driver = {
 685                 .name = "wm8994",
 686                 .pm = &wm8994_pm_ops,
 687                 .of_match_table = of_match_ptr(wm8994_of_match),
 688         },
 689         .probe = wm8994_i2c_probe,
 690         .remove = wm8994_i2c_remove,
 691         .id_table = wm8994_i2c_id,
 692 };
 693
 694 module_i2c_driver(wm8994_i2c_driver);
 695
 696 MODULE_DESCRIPTION("Core support for the WM8994 audio CODEC");
 697 MODULE_LICENSE("GPL");
 698 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");