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 /**
  37  * wm8994_reg_read: Read a single WM8994 register.
  38  *
  39  * @wm8994: Device to read from.
  40  * @reg: Register to read.
  41  */
  42 int wm8994_reg_read(struct wm8994 *wm8994, unsigned short reg)
  43 {
  44         unsigned int val;
  45         int ret;
  46
  47         ret = regmap_read(wm8994->regmap, reg, &val);
  48
  49         if (ret < 0)
  50                 return ret;
  51         else
  52                 return val;
  53 }
  54 EXPORT_SYMBOL_GPL(wm8994_reg_read);
  55
  56 /**
  57  * wm8994_bulk_read: Read multiple WM8994 registers
  58  *
  59  * @wm8994: Device to read from
  60  * @reg: First register
  61  * @count: Number of registers
  62  * @buf: Buffer to fill.  The data will be returned big endian.
  63  */
  64 int wm8994_bulk_read(struct wm8994 *wm8994, unsigned short reg,
  65                      int count, u16 *buf)
  66 {
  67         return regmap_bulk_read(wm8994->regmap, reg, buf, count);
  68 }
  69
  70 /**
  71  * wm8994_reg_write: Write a single WM8994 register.
  72  *
  73  * @wm8994: Device to write to.
  74  * @reg: Register to write to.
  75  * @val: Value to write.
  76  */
  77 int wm8994_reg_write(struct wm8994 *wm8994, unsigned short reg,
  78                      unsigned short val)
  79 {
  80         return regmap_write(wm8994->regmap, reg, val);
  81 }
  82 EXPORT_SYMBOL_GPL(wm8994_reg_write);
  83
  84 /**
  85  * wm8994_bulk_write: Write multiple WM8994 registers
  86  *
  87  * @wm8994: Device to write to
  88  * @reg: First register
  89  * @count: Number of registers
  90  * @buf: Buffer to write from.  Data must be big-endian formatted.
  91  */
  92 int wm8994_bulk_write(struct wm8994 *wm8994, unsigned short reg,
  93                       int count, const u16 *buf)
  94 {
  95         return regmap_raw_write(wm8994->regmap, reg, buf, count * sizeof(u16));
  96 }
  97 EXPORT_SYMBOL_GPL(wm8994_bulk_write);
  98
  99 /**
 100  * wm8994_set_bits: Set the value of a bitfield in a WM8994 register
 101  *
 102  * @wm8994: Device to write to.
 103  * @reg: Register to write to.
 104  * @mask: Mask of bits to set.
 105  * @val: Value to set (unshifted)
 106  */
 107 int wm8994_set_bits(struct wm8994 *wm8994, unsigned short reg,
 108                     unsigned short mask, unsigned short val)
 109 {
 110         return regmap_update_bits(wm8994->regmap, reg, mask, val);
 111 }
 112 EXPORT_SYMBOL_GPL(wm8994_set_bits);
 113
 114 static struct mfd_cell wm8994_regulator_devs[] = {
 115         {
 116                 .name = "wm8994-ldo",
 117                 .id = 1,
 118                 .pm_runtime_no_callbacks = true,
 119         },
 120         {
 121                 .name = "wm8994-ldo",
 122                 .id = 2,
 123                 .pm_runtime_no_callbacks = true,
 124         },
 125 };
 126
 127 static struct resource wm8994_codec_resources[] = {
 128         {
 129                 .start = WM8994_IRQ_TEMP_SHUT,
 130                 .end   = WM8994_IRQ_TEMP_WARN,
 131                 .flags = IORESOURCE_IRQ,
 132         },
 133 };
 134
 135 static struct resource wm8994_gpio_resources[] = {
 136         {
 137                 .start = WM8994_IRQ_GPIO(1),
 138                 .end   = WM8994_IRQ_GPIO(11),
 139                 .flags = IORESOURCE_IRQ,
 140         },
 141 };
 142
 143 static struct mfd_cell wm8994_devs[] = {
 144         {
 145                 .name = "wm8994-codec",
 146                 .num_resources = ARRAY_SIZE(wm8994_codec_resources),
 147                 .resources = wm8994_codec_resources,
 148         },
 149
 150         {
 151                 .name = "wm8994-gpio",
 152                 .num_resources = ARRAY_SIZE(wm8994_gpio_resources),
 153                 .resources = wm8994_gpio_resources,
 154                 .pm_runtime_no_callbacks = true,
 155         },
 156 };
 157
 158 /*
 159  * Supplies for the main bulk of CODEC; the LDO supplies are ignored
 160  * and should be handled via the standard regulator API supply
 161  * management.
 162  */
 163 static const char *wm1811_main_supplies[] = {
 164         "DBVDD1",
 165         "DBVDD2",
 166         "DBVDD3",
 167         "DCVDD",
 168         "AVDD1",
 169         "AVDD2",
 170         "CPVDD",
 171         "SPKVDD1",
 172         "SPKVDD2",
 173 };
 174
 175 static const char *wm8994_main_supplies[] = {
 176         "DBVDD",
 177         "DCVDD",
 178         "AVDD1",
 179         "AVDD2",
 180         "CPVDD",
 181         "SPKVDD1",
 182         "SPKVDD2",
 183 };
 184
 185 static const char *wm8958_main_supplies[] = {
 186         "DBVDD1",
 187         "DBVDD2",
 188         "DBVDD3",
 189         "DCVDD",
 190         "AVDD1",
 191         "AVDD2",
 192         "CPVDD",
 193         "SPKVDD1",
 194         "SPKVDD2",
 195 };
 196
 197 #ifdef CONFIG_PM_RUNTIME
 198 static int wm8994_suspend(struct device *dev)
 199 {
 200         struct wm8994 *wm8994 = dev_get_drvdata(dev);
 201         int ret;
 202
 203         /* Don't actually go through with the suspend if the CODEC is
 204          * still active for accessory detect. */
 205         switch (wm8994->type) {
 206         case WM8958:
 207         case WM1811:
 208                 ret = wm8994_reg_read(wm8994, WM8958_MIC_DETECT_1);
 209                 if (ret < 0) {
 210                         dev_err(dev, "Failed to read power status: %d\n", ret);
 211                 } else if (ret & WM8958_MICD_ENA) {
 212                         dev_dbg(dev, "CODEC still active, ignoring suspend\n");
 213                         return 0;
 214                 }
 215                 break;
 216         default:
 217                 break;
 218         }
 219
 220         /* Disable LDO pulldowns while the device is suspended if we
 221          * don't know that something will be driving them. */
 222         if (!wm8994->ldo_ena_always_driven)
 223                 wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,
 224                                 WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD,
 225                                 WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD);
 226
 227         /* Explicitly put the device into reset in case regulators
 228          * don't get disabled in order to ensure consistent restart.
 229          */
 230         wm8994_reg_write(wm8994, WM8994_SOFTWARE_RESET,
 231                          wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET));
 232
 233         regcache_mark_dirty(wm8994->regmap);
 234
 235         /* Restore GPIO registers to prevent problems with mismatched
 236          * pin configurations.
 237          */
 238         ret = regcache_sync_region(wm8994->regmap, WM8994_GPIO_1,
 239                                    WM8994_GPIO_11);
 240         if (ret != 0)
 241                 dev_err(dev, "Failed to restore GPIO registers: %d\n", ret);
 242
 243         /* In case one of the GPIOs is used as a wake input. */
 244         ret = regcache_sync_region(wm8994->regmap,
 245                                    WM8994_INTERRUPT_STATUS_1_MASK,
 246                                    WM8994_INTERRUPT_STATUS_1_MASK);
 247         if (ret != 0)
 248                 dev_err(dev, "Failed to restore interrupt mask: %d\n", ret);
 249
 250         regcache_cache_only(wm8994->regmap, true);
 251         wm8994->suspended = true;
 252
 253         ret = regulator_bulk_disable(wm8994->num_supplies,
 254                                      wm8994->supplies);
 255         if (ret != 0) {
 256                 dev_err(dev, "Failed to disable supplies: %d\n", ret);
 257                 return ret;
 258         }
 259
 260         return 0;
 261 }
 262
 263 static int wm8994_resume(struct device *dev)
 264 {
 265         struct wm8994 *wm8994 = dev_get_drvdata(dev);
 266         int ret;
 267
 268         /* We may have lied to the PM core about suspending */
 269         if (!wm8994->suspended)
 270                 return 0;
 271
 272         ret = regulator_bulk_enable(wm8994->num_supplies,
 273                                     wm8994->supplies);
 274         if (ret != 0) {
 275                 dev_err(dev, "Failed to enable supplies: %d\n", ret);
 276                 return ret;
 277         }
 278
 279         regcache_cache_only(wm8994->regmap, false);
 280         ret = regcache_sync(wm8994->regmap);
 281         if (ret != 0) {
 282                 dev_err(dev, "Failed to restore register map: %d\n", ret);
 283                 goto err_enable;
 284         }
 285
 286         /* Disable LDO pulldowns while the device is active */
 287         wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,
 288                         WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD,
 289                         0);
 290
 291         wm8994->suspended = false;
 292
 293         return 0;
 294
 295 err_enable:
 296         regulator_bulk_disable(wm8994->num_supplies, wm8994->supplies);
 297
 298         return ret;
 299 }
 300 #endif
 301
 302 #ifdef CONFIG_REGULATOR
 303 static int wm8994_ldo_in_use(struct wm8994_pdata *pdata, int ldo)
 304 {
 305         struct wm8994_ldo_pdata *ldo_pdata;
 306
 307         if (!pdata)
 308                 return 0;
 309
 310         ldo_pdata = &pdata->ldo[ldo];
 311
 312         if (!ldo_pdata->init_data)
 313                 return 0;
 314
 315         return ldo_pdata->init_data->num_consumer_supplies != 0;
 316 }
 317 #else
 318 static int wm8994_ldo_in_use(struct wm8994_pdata *pdata, int ldo)
 319 {
 320         return 0;
 321 }
 322 #endif
 323
 324 static const struct reg_default wm8994_revc_patch[] = {
 325         { 0x102, 0x3 },
 326         { 0x56, 0x3 },
 327         { 0x817, 0x0 },
 328         { 0x102, 0x0 },
 329 };
 330
 331 static const struct reg_default wm8958_reva_patch[] = {
 332         { 0x102, 0x3 },
 333         { 0xcb, 0x81 },
 334         { 0x817, 0x0 },
 335         { 0x102, 0x0 },
 336 };
 337
 338 static const struct reg_default wm1811_reva_patch[] = {
 339         { 0x102, 0x3 },
 340         { 0x56, 0xc07 },
 341         { 0x5d, 0x7e },
 342         { 0x5e, 0x0 },
 343         { 0x102, 0x0 },
 344 };
 345
 346 #ifdef CONFIG_OF
 347 static int wm8994_set_pdata_from_of(struct wm8994 *wm8994)
 348 {
 349         struct device_node *np = wm8994->dev->of_node;
 350         struct wm8994_pdata *pdata = &wm8994->pdata;
 351         int i;
 352
 353         if (!np)
 354                 return 0;
 355
 356         if (of_property_read_u32_array(np, "wlf,gpio-cfg", pdata->gpio_defaults,
 357                                        ARRAY_SIZE(pdata->gpio_defaults)) >= 0) {
 358                 for (i = 0; i < ARRAY_SIZE(pdata->gpio_defaults); i++) {
 359                         if (wm8994->pdata.gpio_defaults[i] == 0)
 360                                 pdata->gpio_defaults[i]
 361                                         = WM8994_CONFIGURE_GPIO;
 362                 }
 363         }
 364
 365         of_property_read_u32_array(np, "wlf,micbias-cfg", pdata->micbias,
 366                                    ARRAY_SIZE(pdata->micbias));
 367
 368         pdata->lineout1_diff = true;
 369         pdata->lineout2_diff = true;
 370         if (of_find_property(np, "wlf,lineout1-se", NULL))
 371                 pdata->lineout1_diff = false;
 372         if (of_find_property(np, "wlf,lineout2-se", NULL))
 373                 pdata->lineout2_diff = false;
 374
 375         if (of_find_property(np, "wlf,lineout1-feedback", NULL))
 376                 pdata->lineout1fb = true;
 377         if (of_find_property(np, "wlf,lineout2-feedback", NULL))
 378                 pdata->lineout2fb = true;
 379
 380         if (of_find_property(np, "wlf,ldoena-always-driven", NULL))
 381                 pdata->lineout2fb = true;
 382
 383         pdata->ldo[0].enable = of_get_named_gpio(np, "wlf,ldo1ena", 0);
 384         if (pdata->ldo[0].enable < 0)
 385                 pdata->ldo[0].enable = 0;
 386
 387         pdata->ldo[1].enable = of_get_named_gpio(np, "wlf,ldo2ena", 0);
 388         if (pdata->ldo[1].enable < 0)
 389                 pdata->ldo[1].enable = 0;
 390
 391         return 0;
 392 }
 393 #else
 394 static int wm8994_set_pdata_from_of(struct wm8994 *wm8994)
 395 {
 396         return 0;
 397 }
 398 #endif
 399
 400 /*
 401  * Instantiate the generic non-control parts of the device.
 402  */
 403 static int wm8994_device_init(struct wm8994 *wm8994, int irq)
 404 {
 405         struct wm8994_pdata *pdata;
 406         struct regmap_config *regmap_config;
 407         const struct reg_default *regmap_patch = NULL;
 408         const char *devname;
 409         int ret, i, patch_regs = 0;
 410         int pulls = 0;
 411
 412         if (dev_get_platdata(wm8994->dev)) {
 413                 pdata = dev_get_platdata(wm8994->dev);
 414                 wm8994->pdata = *pdata;
 415         }
 416         pdata = &wm8994->pdata;
 417
 418         ret = wm8994_set_pdata_from_of(wm8994);
 419         if (ret != 0)
 420                 return ret;
 421
 422         dev_set_drvdata(wm8994->dev, wm8994);
 423
 424         /* Add the on-chip regulators first for bootstrapping */
 425         ret = mfd_add_devices(wm8994->dev, -1,
 426                               wm8994_regulator_devs,
 427                               ARRAY_SIZE(wm8994_regulator_devs),
 428                               NULL, 0, NULL);
 429         if (ret != 0) {
 430                 dev_err(wm8994->dev, "Failed to add children: %d\n", ret);
 431                 goto err;
 432         }
 433
 434         switch (wm8994->type) {
 435         case WM1811:
 436                 wm8994->num_supplies = ARRAY_SIZE(wm1811_main_supplies);
 437                 break;
 438         case WM8994:
 439                 wm8994->num_supplies = ARRAY_SIZE(wm8994_main_supplies);
 440                 break;
 441         case WM8958:
 442                 wm8994->num_supplies = ARRAY_SIZE(wm8958_main_supplies);
 443                 break;
 444         default:
 445                 BUG();
 446                 goto err;
 447         }
 448
 449         wm8994->supplies = devm_kzalloc(wm8994->dev,
 450                                         sizeof(struct regulator_bulk_data) *
 451                                         wm8994->num_supplies, GFP_KERNEL);
 452         if (!wm8994->supplies) {
 453                 ret = -ENOMEM;
 454                 goto err;
 455         }
 456
 457         switch (wm8994->type) {
 458         case WM1811:
 459                 for (i = 0; i < ARRAY_SIZE(wm1811_main_supplies); i++)
 460                         wm8994->supplies[i].supply = wm1811_main_supplies[i];
 461                 break;
 462         case WM8994:
 463                 for (i = 0; i < ARRAY_SIZE(wm8994_main_supplies); i++)
 464                         wm8994->supplies[i].supply = wm8994_main_supplies[i];
 465                 break;
 466         case WM8958:
 467                 for (i = 0; i < ARRAY_SIZE(wm8958_main_supplies); i++)
 468                         wm8994->supplies[i].supply = wm8958_main_supplies[i];
 469                 break;
 470         default:
 471                 BUG();
 472                 goto err;
 473         }
 474
 475         ret = devm_regulator_bulk_get(wm8994->dev, wm8994->num_supplies,
 476                                  wm8994->supplies);
 477         if (ret != 0) {
 478                 dev_err(wm8994->dev, "Failed to get supplies: %d\n", ret);
 479                 goto err;
 480         }
 481
 482         ret = regulator_bulk_enable(wm8994->num_supplies,
 483                                     wm8994->supplies);
 484         if (ret != 0) {
 485                 dev_err(wm8994->dev, "Failed to enable supplies: %d\n", ret);
 486                 goto err;
 487         }
 488
 489         ret = wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET);
 490         if (ret < 0) {
 491                 dev_err(wm8994->dev, "Failed to read ID register\n");
 492                 goto err_enable;
 493         }
 494         switch (ret) {
 495         case 0x1811:
 496                 devname = "WM1811";
 497                 if (wm8994->type != WM1811)
 498                         dev_warn(wm8994->dev, "Device registered as type %d\n",
 499                                  wm8994->type);
 500                 wm8994->type = WM1811;
 501                 break;
 502         case 0x8994:
 503                 devname = "WM8994";
 504                 if (wm8994->type != WM8994)
 505                         dev_warn(wm8994->dev, "Device registered as type %d\n",
 506                                  wm8994->type);
 507                 wm8994->type = WM8994;
 508                 break;
 509         case 0x8958:
 510                 devname = "WM8958";
 511                 if (wm8994->type != WM8958)
 512                         dev_warn(wm8994->dev, "Device registered as type %d\n",
 513                                  wm8994->type);
 514                 wm8994->type = WM8958;
 515                 break;
 516         default:
 517                 dev_err(wm8994->dev, "Device is not a WM8994, ID is %x\n",
 518                         ret);
 519                 ret = -EINVAL;
 520                 goto err_enable;
 521         }
 522
 523         ret = wm8994_reg_read(wm8994, WM8994_CHIP_REVISION);
 524         if (ret < 0) {
 525                 dev_err(wm8994->dev, "Failed to read revision register: %d\n",
 526                         ret);
 527                 goto err_enable;
 528         }
 529         wm8994->revision = ret & WM8994_CHIP_REV_MASK;
 530         wm8994->cust_id = (ret & WM8994_CUST_ID_MASK) >> WM8994_CUST_ID_SHIFT;
 531
 532         switch (wm8994->type) {
 533         case WM8994:
 534                 switch (wm8994->revision) {
 535                 case 0:
 536                 case 1:
 537                         dev_warn(wm8994->dev,
 538                                  "revision %c not fully supported\n",
 539                                  'A' + wm8994->revision);
 540                         break;
 541                 case 2:
 542                 case 3:
 543                 default:
 544                         regmap_patch = wm8994_revc_patch;
 545                         patch_regs = ARRAY_SIZE(wm8994_revc_patch);
 546                         break;
 547                 }
 548                 break;
 549
 550         case WM8958:
 551                 switch (wm8994->revision) {
 552                 case 0:
 553                         regmap_patch = wm8958_reva_patch;
 554                         patch_regs = ARRAY_SIZE(wm8958_reva_patch);
 555                         break;
 556                 default:
 557                         break;
 558                 }
 559                 break;
 560
 561         case WM1811:
 562                 /* Revision C did not change the relevant layer */
 563                 if (wm8994->revision > 1)
 564                         wm8994->revision++;
 565
 566                 regmap_patch = wm1811_reva_patch;
 567                 patch_regs = ARRAY_SIZE(wm1811_reva_patch);
 568                 break;
 569
 570         default:
 571                 break;
 572         }
 573
 574         dev_info(wm8994->dev, "%s revision %c CUST_ID %02x\n", devname,
 575                  'A' + wm8994->revision, wm8994->cust_id);
 576
 577         switch (wm8994->type) {
 578         case WM1811:
 579                 regmap_config = &wm1811_regmap_config;
 580                 break;
 581         case WM8994:
 582                 regmap_config = &wm8994_regmap_config;
 583                 break;
 584         case WM8958:
 585                 regmap_config = &wm8958_regmap_config;
 586                 break;
 587         default:
 588                 dev_err(wm8994->dev, "Unknown device type %d\n", wm8994->type);
 589                 return -EINVAL;
 590         }
 591
 592         ret = regmap_reinit_cache(wm8994->regmap, regmap_config);
 593         if (ret != 0) {
 594                 dev_err(wm8994->dev, "Failed to reinit register cache: %d\n",
 595                         ret);
 596                 return ret;
 597         }
 598
 599         /* Explicitly put the device into reset in case regulators
 600          * don't get disabled in order to ensure we know the device
 601          * state.
 602          */
 603         ret = wm8994_reg_write(wm8994, WM8994_SOFTWARE_RESET,
 604                                wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET));
 605         if (ret != 0) {
 606                 dev_err(wm8994->dev, "Failed to reset device: %d\n", ret);
 607                 return ret;
 608         }
 609
 610         if (regmap_patch) {
 611                 ret = regmap_register_patch(wm8994->regmap, regmap_patch,
 612                                             patch_regs);
 613                 if (ret != 0) {
 614                         dev_err(wm8994->dev, "Failed to register patch: %d\n",
 615                                 ret);
 616                         goto err;
 617                 }
 618         }
 619
 620         wm8994->irq_base = pdata->irq_base;
 621         wm8994->gpio_base = pdata->gpio_base;
 622
 623         /* GPIO configuration is only applied if it's non-zero */
 624         for (i = 0; i < ARRAY_SIZE(pdata->gpio_defaults); i++) {
 625                 if (pdata->gpio_defaults[i]) {
 626                         wm8994_set_bits(wm8994, WM8994_GPIO_1 + i,
 627                                         0xffff, pdata->gpio_defaults[i]);
 628                 }
 629         }
 630
 631         wm8994->ldo_ena_always_driven = pdata->ldo_ena_always_driven;
 632
 633         if (pdata->spkmode_pu)
 634                 pulls |= WM8994_SPKMODE_PU;
 635
 636         /* Disable unneeded pulls */
 637         wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,
 638                         WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD |
 639                         WM8994_SPKMODE_PU | WM8994_CSNADDR_PD,
 640                         pulls);
 641
 642         /* In some system designs where the regulators are not in use,
 643          * we can achieve a small reduction in leakage currents by
 644          * floating LDO outputs.  This bit makes no difference if the
 645          * LDOs are enabled, it only affects cases where the LDOs were
 646          * in operation and are then disabled.
 647          */
 648         for (i = 0; i < WM8994_NUM_LDO_REGS; i++) {
 649                 if (wm8994_ldo_in_use(pdata, i))
 650                         wm8994_set_bits(wm8994, WM8994_LDO_1 + i,
 651                                         WM8994_LDO1_DISCH, WM8994_LDO1_DISCH);
 652                 else
 653                         wm8994_set_bits(wm8994, WM8994_LDO_1 + i,
 654                                         WM8994_LDO1_DISCH, 0);
 655         }
 656
 657         wm8994_irq_init(wm8994);
 658
 659         ret = mfd_add_devices(wm8994->dev, -1,
 660                               wm8994_devs, ARRAY_SIZE(wm8994_devs),
 661                               NULL, 0, NULL);
 662         if (ret != 0) {
 663                 dev_err(wm8994->dev, "Failed to add children: %d\n", ret);
 664                 goto err_irq;
 665         }
 666
 667         pm_runtime_enable(wm8994->dev);
 668         pm_runtime_idle(wm8994->dev);
 669
 670         return 0;
 671
 672 err_irq:
 673         wm8994_irq_exit(wm8994);
 674 err_enable:
 675         regulator_bulk_disable(wm8994->num_supplies,
 676                                wm8994->supplies);
 677 err:
 678         mfd_remove_devices(wm8994->dev);
 679         return ret;
 680 }
 681
 682 static void wm8994_device_exit(struct wm8994 *wm8994)
 683 {
 684         pm_runtime_disable(wm8994->dev);
 685         mfd_remove_devices(wm8994->dev);
 686         wm8994_irq_exit(wm8994);
 687         regulator_bulk_disable(wm8994->num_supplies,
 688                                wm8994->supplies);
 689 }
 690
 691 static const struct of_device_id wm8994_of_match[] = {
 692         { .compatible = "wlf,wm1811", .data = (void *)WM1811 },
 693         { .compatible = "wlf,wm8994", .data = (void *)WM8994 },
 694         { .compatible = "wlf,wm8958", .data = (void *)WM8958 },
 695         { }
 696 };
 697 MODULE_DEVICE_TABLE(of, wm8994_of_match);
 698
 699 static int wm8994_i2c_probe(struct i2c_client *i2c,
 700                                       const struct i2c_device_id *id)
 701 {
 702         const struct of_device_id *of_id;
 703         struct wm8994 *wm8994;
 704         int ret;
 705
 706         wm8994 = devm_kzalloc(&i2c->dev, sizeof(struct wm8994), GFP_KERNEL);
 707         if (wm8994 == NULL)
 708                 return -ENOMEM;
 709
 710         i2c_set_clientdata(i2c, wm8994);
 711         wm8994->dev = &i2c->dev;
 712         wm8994->irq = i2c->irq;
 713
 714         if (i2c->dev.of_node) {
 715                 of_id = of_match_device(wm8994_of_match, &i2c->dev);
 716                 if (of_id)
 717                         wm8994->type = (int)of_id->data;
 718         } else {
 719                 wm8994->type = id->driver_data;
 720         }
 721
 722         wm8994->regmap = devm_regmap_init_i2c(i2c, &wm8994_base_regmap_config);
 723         if (IS_ERR(wm8994->regmap)) {
 724                 ret = PTR_ERR(wm8994->regmap);
 725                 dev_err(wm8994->dev, "Failed to allocate register map: %d\n",
 726                         ret);
 727                 return ret;
 728         }
 729
 730         return wm8994_device_init(wm8994, i2c->irq);
 731 }
 732
 733 static int wm8994_i2c_remove(struct i2c_client *i2c)
 734 {
 735         struct wm8994 *wm8994 = i2c_get_clientdata(i2c);
 736
 737         wm8994_device_exit(wm8994);
 738
 739         return 0;
 740 }
 741
 742 static const struct i2c_device_id wm8994_i2c_id[] = {
 743         { "wm1811", WM1811 },
 744         { "wm1811a", WM1811 },
 745         { "wm8994", WM8994 },
 746         { "wm8958", WM8958 },
 747         { }
 748 };
 749 MODULE_DEVICE_TABLE(i2c, wm8994_i2c_id);
 750
 751 static const struct dev_pm_ops wm8994_pm_ops = {
 752         SET_RUNTIME_PM_OPS(wm8994_suspend, wm8994_resume, NULL)
 753 };
 754
 755 static struct i2c_driver wm8994_i2c_driver = {
 756         .driver = {
 757                 .name = "wm8994",
 758                 .owner = THIS_MODULE,
 759                 .pm = &wm8994_pm_ops,
 760                 .of_match_table = of_match_ptr(wm8994_of_match),
 761         },
 762         .probe = wm8994_i2c_probe,
 763         .remove = wm8994_i2c_remove,
 764         .id_table = wm8994_i2c_id,
 765 };
 766
 767 module_i2c_driver(wm8994_i2c_driver);
 768
 769 MODULE_DESCRIPTION("Core support for the WM8994 audio CODEC");
 770 MODULE_LICENSE("GPL");
 771 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");