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/pm_runtime.h>
  19 #include <linux/regmap.h>
  20 #include <linux/regulator/consumer.h>
  21 #include <linux/regulator/machine.h>
  22
  23 #include <linux/mfd/wm8994/core.h>
  24 #include <linux/mfd/wm8994/pdata.h>
  25 #include <linux/mfd/wm8994/registers.h>
  26
  27 #include "wm8994.h"
  28
  29 static const struct mfd_cell wm8994_regulator_devs[] = {
  30         {
  31                 .name = "wm8994-ldo",
  32                 .id = 0,
  33                 .pm_runtime_no_callbacks = true,
  34         },
  35         {
  36                 .name = "wm8994-ldo",
  37                 .id = 1,
  38                 .pm_runtime_no_callbacks = true,
  39         },
  40 };
  41
  42 static const struct resource wm8994_codec_resources[] = {
  43         {
  44                 .start = WM8994_IRQ_TEMP_SHUT,
  45                 .end   = WM8994_IRQ_TEMP_WARN,
  46                 .flags = IORESOURCE_IRQ,
  47         },
  48 };
  49
  50 static const struct resource wm8994_gpio_resources[] = {
  51         {
  52                 .start = WM8994_IRQ_GPIO(1),
  53                 .end   = WM8994_IRQ_GPIO(11),
  54                 .flags = IORESOURCE_IRQ,
  55         },
  56 };
  57
  58 static const struct mfd_cell wm8994_devs[] = {
  59         {
  60                 .name = "wm8994-codec",
  61                 .num_resources = ARRAY_SIZE(wm8994_codec_resources),
  62                 .resources = wm8994_codec_resources,
  63         },
  64
  65         {
  66                 .name = "wm8994-gpio",
  67                 .num_resources = ARRAY_SIZE(wm8994_gpio_resources),
  68                 .resources = wm8994_gpio_resources,
  69                 .pm_runtime_no_callbacks = true,
  70         },
  71 };
  72
  73 /*
  74  * Supplies for the main bulk of CODEC; the LDO supplies are ignored
  75  * and should be handled via the standard regulator API supply
  76  * management.
  77  */
  78 static const char *wm1811_main_supplies[] = {
  79         "DBVDD1",
  80         "DBVDD2",
  81         "DBVDD3",
  82         "DCVDD",
  83         "AVDD1",
  84         "AVDD2",
  85         "CPVDD",
  86         "SPKVDD1",
  87         "SPKVDD2",
  88 };
  89
  90 static const char *wm8994_main_supplies[] = {
  91         "DBVDD",
  92         "DCVDD",
  93         "AVDD1",
  94         "AVDD2",
  95         "CPVDD",
  96         "SPKVDD1",
  97         "SPKVDD2",
  98 };
  99
 100 static const char *wm8958_main_supplies[] = {
 101         "DBVDD1",
 102         "DBVDD2",
 103         "DBVDD3",
 104         "DCVDD",
 105         "AVDD1",
 106         "AVDD2",
 107         "CPVDD",
 108         "SPKVDD1",
 109         "SPKVDD2",
 110 };
 111
 112 static int wm8994_suspend(struct device *dev)
 113 {
 114         struct wm8994 *wm8994 = dev_get_drvdata(dev);
 115         int ret;
 116
 117         /* Don't actually go through with the suspend if the CODEC is
 118          * still active for accessory detect. */
 119         switch (wm8994->type) {
 120         case WM8958:
 121         case WM1811:
 122                 ret = wm8994_reg_read(wm8994, WM8958_MIC_DETECT_1);
 123                 if (ret < 0) {
 124                         dev_err(dev, "Failed to read power status: %d\n", ret);
 125                 } else if (ret & WM8958_MICD_ENA) {
 126                         dev_dbg(dev, "CODEC still active, ignoring suspend\n");
 127                         return 0;
 128                 }
 129                 break;
 130         default:
 131                 break;
 132         }
 133
 134         /* Disable LDO pulldowns while the device is suspended if we
 135          * don't know that something will be driving them. */
 136         if (!wm8994->ldo_ena_always_driven)
 137                 wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,
 138                                 WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD,
 139                                 WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD);
 140
 141         /* Explicitly put the device into reset in case regulators
 142          * don't get disabled in order to ensure consistent restart.
 143          */
 144         wm8994_reg_write(wm8994, WM8994_SOFTWARE_RESET,
 145                          wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET));
 146
 147         regcache_mark_dirty(wm8994->regmap);
 148
 149         /* Restore GPIO registers to prevent problems with mismatched
 150          * pin configurations.
 151          */
 152         ret = regcache_sync_region(wm8994->regmap, WM8994_GPIO_1,
 153                                    WM8994_GPIO_11);
 154         if (ret != 0)
 155                 dev_err(dev, "Failed to restore GPIO registers: %d\n", ret);
 156
 157         /* In case one of the GPIOs is used as a wake input. */
 158         ret = regcache_sync_region(wm8994->regmap,
 159                                    WM8994_INTERRUPT_STATUS_1_MASK,
 160                                    WM8994_INTERRUPT_STATUS_1_MASK);
 161         if (ret != 0)
 162                 dev_err(dev, "Failed to restore interrupt mask: %d\n", ret);
 163
 164         regcache_cache_only(wm8994->regmap, true);
 165         wm8994->suspended = true;
 166
 167         ret = regulator_bulk_disable(wm8994->num_supplies,
 168                                      wm8994->supplies);
 169         if (ret != 0) {
 170                 dev_err(dev, "Failed to disable supplies: %d\n", ret);
 171                 return ret;
 172         }
 173
 174         return 0;
 175 }
 176
 177 static int wm8994_resume(struct device *dev)
 178 {
 179         struct wm8994 *wm8994 = dev_get_drvdata(dev);
 180         int ret;
 181
 182         /* We may have lied to the PM core about suspending */
 183         if (!wm8994->suspended)
 184                 return 0;
 185
 186         ret = regulator_bulk_enable(wm8994->num_supplies,
 187                                     wm8994->supplies);
 188         if (ret != 0) {
 189                 dev_err(dev, "Failed to enable supplies: %d\n", ret);
 190                 return ret;
 191         }
 192
 193         regcache_cache_only(wm8994->regmap, false);
 194         ret = regcache_sync(wm8994->regmap);
 195         if (ret != 0) {
 196                 dev_err(dev, "Failed to restore register map: %d\n", ret);
 197                 goto err_enable;
 198         }
 199
 200         /* Disable LDO pulldowns while the device is active */
 201         wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,
 202                         WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD,
 203                         0);
 204
 205         wm8994->suspended = false;
 206
 207         return 0;
 208
 209 err_enable:
 210         regulator_bulk_disable(wm8994->num_supplies, wm8994->supplies);
 211
 212         return ret;
 213 }
 214
 215 #ifdef CONFIG_REGULATOR
 216 static int wm8994_ldo_in_use(struct wm8994_pdata *pdata, int ldo)
 217 {
 218         struct wm8994_ldo_pdata *ldo_pdata;
 219
 220         if (!pdata)
 221                 return 0;
 222
 223         ldo_pdata = &pdata->ldo[ldo];
 224
 225         if (!ldo_pdata->init_data)
 226                 return 0;
 227
 228         return ldo_pdata->init_data->num_consumer_supplies != 0;
 229 }
 230 #else
 231 static int wm8994_ldo_in_use(struct wm8994_pdata *pdata, int ldo)
 232 {
 233         return 0;
 234 }
 235 #endif
 236
 237 static const struct reg_sequence wm8994_revc_patch[] = {
 238         { 0x102, 0x3 },
 239         { 0x56, 0x3 },
 240         { 0x817, 0x0 },
 241         { 0x102, 0x0 },
 242 };
 243
 244 static const struct reg_sequence wm8958_reva_patch[] = {
 245         { 0x102, 0x3 },
 246         { 0xcb, 0x81 },
 247         { 0x817, 0x0 },
 248         { 0x102, 0x0 },
 249 };
 250
 251 static const struct reg_sequence wm1811_reva_patch[] = {
 252         { 0x102, 0x3 },
 253         { 0x56, 0xc07 },
 254         { 0x5d, 0x7e },
 255         { 0x5e, 0x0 },
 256         { 0x102, 0x0 },
 257 };
 258
 259 #ifdef CONFIG_OF
 260 static int wm8994_set_pdata_from_of(struct wm8994 *wm8994)
 261 {
 262         struct device_node *np = wm8994->dev->of_node;
 263         struct wm8994_pdata *pdata = &wm8994->pdata;
 264         int i;
 265
 266         if (!np)
 267                 return 0;
 268
 269         if (of_property_read_u32_array(np, "wlf,gpio-cfg", pdata->gpio_defaults,
 270                                        ARRAY_SIZE(pdata->gpio_defaults)) >= 0) {
 271                 for (i = 0; i < ARRAY_SIZE(pdata->gpio_defaults); i++) {
 272                         if (wm8994->pdata.gpio_defaults[i] == 0)
 273                                 pdata->gpio_defaults[i]
 274                                         = WM8994_CONFIGURE_GPIO;
 275                 }
 276         }
 277
 278         of_property_read_u32_array(np, "wlf,micbias-cfg", pdata->micbias,
 279                                    ARRAY_SIZE(pdata->micbias));
 280
 281         pdata->lineout1_diff = !of_property_read_bool(np, "wlf,lineout1-se");
 282         pdata->lineout2_diff = !of_property_read_bool(np, "wlf,lineout2-se");
 283         pdata->lineout1fb = of_property_read_bool(np, "wlf,lineout1-feedback");
 284         pdata->lineout2fb = of_property_read_bool(np, "wlf,lineout2-feedback") ||
 285                 of_property_read_bool(np, "wlf,ldoena-always-driven");
 286
 287         pdata->spkmode_pu = of_property_read_bool(np, "wlf,spkmode-pu");
 288
 289         pdata->csnaddr_pd = of_property_read_bool(np, "wlf,csnaddr-pd");
 290
 291         return 0;
 292 }
 293 #else
 294 static int wm8994_set_pdata_from_of(struct wm8994 *wm8994)
 295 {
 296         return 0;
 297 }
 298 #endif
 299
 300 /*
 301  * Instantiate the generic non-control parts of the device.
 302  */
 303 static int wm8994_device_init(struct wm8994 *wm8994, int irq)
 304 {
 305         struct wm8994_pdata *pdata;
 306         struct regmap_config *regmap_config;
 307         const struct reg_sequence *regmap_patch = NULL;
 308         const char *devname;
 309         int ret, i, patch_regs = 0;
 310         int pulls = 0;
 311
 312         if (dev_get_platdata(wm8994->dev)) {
 313                 pdata = dev_get_platdata(wm8994->dev);
 314                 wm8994->pdata = *pdata;
 315         }
 316         pdata = &wm8994->pdata;
 317
 318         ret = wm8994_set_pdata_from_of(wm8994);
 319         if (ret != 0)
 320                 return ret;
 321
 322         /* Add the on-chip regulators first for bootstrapping */
 323         ret = mfd_add_devices(wm8994->dev, 0,
 324                               wm8994_regulator_devs,
 325                               ARRAY_SIZE(wm8994_regulator_devs),
 326                               NULL, 0, NULL);
 327         if (ret != 0) {
 328                 dev_err(wm8994->dev, "Failed to add children: %d\n", ret);
 329                 goto err;
 330         }
 331
 332         switch (wm8994->type) {
 333         case WM1811:
 334                 wm8994->num_supplies = ARRAY_SIZE(wm1811_main_supplies);
 335                 break;
 336         case WM8994:
 337                 wm8994->num_supplies = ARRAY_SIZE(wm8994_main_supplies);
 338                 break;
 339         case WM8958:
 340                 wm8994->num_supplies = ARRAY_SIZE(wm8958_main_supplies);
 341                 break;
 342         default:
 343                 BUG();
 344                 goto err;
 345         }
 346
 347         wm8994->supplies = devm_kcalloc(wm8994->dev,
 348                                         wm8994->num_supplies,
 349                                         sizeof(struct regulator_bulk_data),
 350                                         GFP_KERNEL);
 351         if (!wm8994->supplies) {
 352                 ret = -ENOMEM;
 353                 goto err;
 354         }
 355
 356         switch (wm8994->type) {
 357         case WM1811:
 358                 for (i = 0; i < ARRAY_SIZE(wm1811_main_supplies); i++)
 359                         wm8994->supplies[i].supply = wm1811_main_supplies[i];
 360                 break;
 361         case WM8994:
 362                 for (i = 0; i < ARRAY_SIZE(wm8994_main_supplies); i++)
 363                         wm8994->supplies[i].supply = wm8994_main_supplies[i];
 364                 break;
 365         case WM8958:
 366                 for (i = 0; i < ARRAY_SIZE(wm8958_main_supplies); i++)
 367                         wm8994->supplies[i].supply = wm8958_main_supplies[i];
 368                 break;
 369         default:
 370                 BUG();
 371                 goto err;
 372         }
 373
 374         /*
 375          * Can't use devres helper here as some of the supplies are provided by
 376          * wm8994->dev's children (regulators) and those regulators are
 377          * unregistered by the devres core before the supplies are freed.
 378          */
 379         ret = regulator_bulk_get(wm8994->dev, wm8994->num_supplies,
 380                                  wm8994->supplies);
 381         if (ret != 0) {
 382                 if (ret != -EPROBE_DEFER)
 383                         dev_err(wm8994->dev, "Failed to get supplies: %d\n",
 384                                 ret);
 385                 goto err;
 386         }
 387
 388         ret = regulator_bulk_enable(wm8994->num_supplies, wm8994->supplies);
 389         if (ret != 0) {
 390                 dev_err(wm8994->dev, "Failed to enable supplies: %d\n", ret);
 391                 goto err_regulator_free;
 392         }
 393
 394         ret = wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET);
 395         if (ret < 0) {
 396                 dev_err(wm8994->dev, "Failed to read ID register\n");
 397                 goto err_enable;
 398         }
 399         switch (ret) {
 400         case 0x1811:
 401                 devname = "WM1811";
 402                 if (wm8994->type != WM1811)
 403                         dev_warn(wm8994->dev, "Device registered as type %d\n",
 404                                  wm8994->type);
 405                 wm8994->type = WM1811;
 406                 break;
 407         case 0x8994:
 408                 devname = "WM8994";
 409                 if (wm8994->type != WM8994)
 410                         dev_warn(wm8994->dev, "Device registered as type %d\n",
 411                                  wm8994->type);
 412                 wm8994->type = WM8994;
 413                 break;
 414         case 0x8958:
 415                 devname = "WM8958";
 416                 if (wm8994->type != WM8958)
 417                         dev_warn(wm8994->dev, "Device registered as type %d\n",
 418                                  wm8994->type);
 419                 wm8994->type = WM8958;
 420                 break;
 421         default:
 422                 dev_err(wm8994->dev, "Device is not a WM8994, ID is %x\n",
 423                         ret);
 424                 ret = -EINVAL;
 425                 goto err_enable;
 426         }
 427
 428         ret = wm8994_reg_read(wm8994, WM8994_CHIP_REVISION);
 429         if (ret < 0) {
 430                 dev_err(wm8994->dev, "Failed to read revision register: %d\n",
 431                         ret);
 432                 goto err_enable;
 433         }
 434         wm8994->revision = ret & WM8994_CHIP_REV_MASK;
 435         wm8994->cust_id = (ret & WM8994_CUST_ID_MASK) >> WM8994_CUST_ID_SHIFT;
 436
 437         switch (wm8994->type) {
 438         case WM8994:
 439                 switch (wm8994->revision) {
 440                 case 0:
 441                 case 1:
 442                         dev_warn(wm8994->dev,
 443                                  "revision %c not fully supported\n",
 444                                  'A' + wm8994->revision);
 445                         break;
 446                 case 2:
 447                 case 3:
 448                 default:
 449                         regmap_patch = wm8994_revc_patch;
 450                         patch_regs = ARRAY_SIZE(wm8994_revc_patch);
 451                         break;
 452                 }
 453                 break;
 454
 455         case WM8958:
 456                 switch (wm8994->revision) {
 457                 case 0:
 458                         regmap_patch = wm8958_reva_patch;
 459                         patch_regs = ARRAY_SIZE(wm8958_reva_patch);
 460                         break;
 461                 default:
 462                         break;
 463                 }
 464                 break;
 465
 466         case WM1811:
 467                 /* Revision C did not change the relevant layer */
 468                 if (wm8994->revision > 1)
 469                         wm8994->revision++;
 470
 471                 regmap_patch = wm1811_reva_patch;
 472                 patch_regs = ARRAY_SIZE(wm1811_reva_patch);
 473                 break;
 474
 475         default:
 476                 break;
 477         }
 478
 479         dev_info(wm8994->dev, "%s revision %c CUST_ID %02x\n", devname,
 480                  'A' + wm8994->revision, wm8994->cust_id);
 481
 482         switch (wm8994->type) {
 483         case WM1811:
 484                 regmap_config = &wm1811_regmap_config;
 485                 break;
 486         case WM8994:
 487                 regmap_config = &wm8994_regmap_config;
 488                 break;
 489         case WM8958:
 490                 regmap_config = &wm8958_regmap_config;
 491                 break;
 492         default:
 493                 dev_err(wm8994->dev, "Unknown device type %d\n", wm8994->type);
 494                 ret = -EINVAL;
 495                 goto err_enable;
 496         }
 497
 498         ret = regmap_reinit_cache(wm8994->regmap, regmap_config);
 499         if (ret != 0) {
 500                 dev_err(wm8994->dev, "Failed to reinit register cache: %d\n",
 501                         ret);
 502                 goto err_enable;
 503         }
 504
 505         /* Explicitly put the device into reset in case regulators
 506          * don't get disabled in order to ensure we know the device
 507          * state.
 508          */
 509         ret = wm8994_reg_write(wm8994, WM8994_SOFTWARE_RESET,
 510                                wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET));
 511         if (ret != 0) {
 512                 dev_err(wm8994->dev, "Failed to reset device: %d\n", ret);
 513                 goto err_enable;
 514         }
 515
 516         if (regmap_patch) {
 517                 ret = regmap_register_patch(wm8994->regmap, regmap_patch,
 518                                             patch_regs);
 519                 if (ret != 0) {
 520                         dev_err(wm8994->dev, "Failed to register patch: %d\n",
 521                                 ret);
 522                         goto err_enable;
 523                 }
 524         }
 525
 526         wm8994->irq_base = pdata->irq_base;
 527         wm8994->gpio_base = pdata->gpio_base;
 528
 529         /* GPIO configuration is only applied if it's non-zero */
 530         for (i = 0; i < ARRAY_SIZE(pdata->gpio_defaults); i++) {
 531                 if (pdata->gpio_defaults[i]) {
 532                         wm8994_set_bits(wm8994, WM8994_GPIO_1 + i,
 533                                         0xffff, pdata->gpio_defaults[i]);
 534                 }
 535         }
 536
 537         wm8994->ldo_ena_always_driven = pdata->ldo_ena_always_driven;
 538
 539         if (pdata->spkmode_pu)
 540                 pulls |= WM8994_SPKMODE_PU;
 541         if (pdata->csnaddr_pd)
 542                 pulls |= WM8994_CSNADDR_PD;
 543
 544         /* Disable unneeded pulls */
 545         wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,
 546                         WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD |
 547                         WM8994_SPKMODE_PU | WM8994_CSNADDR_PD,
 548                         pulls);
 549
 550         /* In some system designs where the regulators are not in use,
 551          * we can achieve a small reduction in leakage currents by
 552          * floating LDO outputs.  This bit makes no difference if the
 553          * LDOs are enabled, it only affects cases where the LDOs were
 554          * in operation and are then disabled.
 555          */
 556         for (i = 0; i < WM8994_NUM_LDO_REGS; i++) {
 557                 if (wm8994_ldo_in_use(pdata, i))
 558                         wm8994_set_bits(wm8994, WM8994_LDO_1 + i,
 559                                         WM8994_LDO1_DISCH, WM8994_LDO1_DISCH);
 560                 else
 561                         wm8994_set_bits(wm8994, WM8994_LDO_1 + i,
 562                                         WM8994_LDO1_DISCH, 0);
 563         }
 564
 565         wm8994_irq_init(wm8994);
 566
 567         ret = mfd_add_devices(wm8994->dev, -1,
 568                               wm8994_devs, ARRAY_SIZE(wm8994_devs),
 569                               NULL, 0, NULL);
 570         if (ret != 0) {
 571                 dev_err(wm8994->dev, "Failed to add children: %d\n", ret);
 572                 goto err_irq;
 573         }
 574
 575         pm_runtime_set_active(wm8994->dev);
 576         pm_runtime_enable(wm8994->dev);
 577         pm_runtime_idle(wm8994->dev);
 578
 579         return 0;
 580
 581 err_irq:
 582         wm8994_irq_exit(wm8994);
 583 err_enable:
 584         regulator_bulk_disable(wm8994->num_supplies,
 585                                wm8994->supplies);
 586 err_regulator_free:
 587         regulator_bulk_free(wm8994->num_supplies, wm8994->supplies);
 588 err:
 589         mfd_remove_devices(wm8994->dev);
 590         return ret;
 591 }
 592
 593 static void wm8994_device_exit(struct wm8994 *wm8994)
 594 {
 595         pm_runtime_get_sync(wm8994->dev);
 596         pm_runtime_disable(wm8994->dev);
 597         pm_runtime_put_noidle(wm8994->dev);
 598         wm8994_irq_exit(wm8994);
 599         regulator_bulk_disable(wm8994->num_supplies, wm8994->supplies);
 600         regulator_bulk_free(wm8994->num_supplies, wm8994->supplies);
 601         mfd_remove_devices(wm8994->dev);
 602 }
 603
 604 static const struct of_device_id wm8994_of_match[] = {
 605         { .compatible = "wlf,wm1811", .data = (void *)WM1811 },
 606         { .compatible = "wlf,wm8994", .data = (void *)WM8994 },
 607         { .compatible = "wlf,wm8958", .data = (void *)WM8958 },
 608         { }
 609 };
 610 MODULE_DEVICE_TABLE(of, wm8994_of_match);
 611
 612 static int wm8994_i2c_probe(struct i2c_client *i2c)
 613 {
 614         struct wm8994 *wm8994;
 615         int ret;
 616
 617         wm8994 = devm_kzalloc(&i2c->dev, sizeof(struct wm8994), GFP_KERNEL);
 618         if (wm8994 == NULL)
 619                 return -ENOMEM;
 620
 621         i2c_set_clientdata(i2c, wm8994);
 622         wm8994->dev = &i2c->dev;
 623         wm8994->irq = i2c->irq;
 624
 625         wm8994->type = (enum wm8994_type)i2c_get_match_data(i2c);
 626
 627         wm8994->regmap = devm_regmap_init_i2c(i2c, &wm8994_base_regmap_config);
 628         if (IS_ERR(wm8994->regmap)) {
 629                 ret = PTR_ERR(wm8994->regmap);
 630                 dev_err(wm8994->dev, "Failed to allocate register map: %d\n",
 631                         ret);
 632                 return ret;
 633         }
 634
 635         return wm8994_device_init(wm8994, i2c->irq);
 636 }
 637
 638 static void wm8994_i2c_remove(struct i2c_client *i2c)
 639 {
 640         struct wm8994 *wm8994 = i2c_get_clientdata(i2c);
 641
 642         wm8994_device_exit(wm8994);
 643 }
 644
 645 static const struct i2c_device_id wm8994_i2c_id[] = {
 646         { "wm1811", WM1811 },
 647         { "wm1811a", WM1811 },
 648         { "wm8994", WM8994 },
 649         { "wm8958", WM8958 },
 650         { }
 651 };
 652 MODULE_DEVICE_TABLE(i2c, wm8994_i2c_id);
 653
 654 static const struct dev_pm_ops wm8994_pm_ops = {
 655         RUNTIME_PM_OPS(wm8994_suspend, wm8994_resume, NULL)
 656 };
 657
 658 static struct i2c_driver wm8994_i2c_driver = {
 659         .driver = {
 660                 .name = "wm8994",
 661                 .pm = pm_ptr(&wm8994_pm_ops),
 662                 .of_match_table = wm8994_of_match,
 663         },
 664         .probe = wm8994_i2c_probe,
 665         .remove = wm8994_i2c_remove,
 666         .id_table = wm8994_i2c_id,
 667 };
 668
 669 module_i2c_driver(wm8994_i2c_driver);
 670
 671 MODULE_DESCRIPTION("Core support for the WM8994 audio CODEC");
 672 MODULE_LICENSE("GPL");
 673 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 674 MODULE_SOFTDEP("pre: wm8994_regulator");