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 (eg, for audio passthrough from CP. */
 205         ret = wm8994_reg_read(wm8994, WM8994_POWER_MANAGEMENT_1);
 206         if (ret < 0) {
 207                 dev_err(dev, "Failed to read power status: %d\n", ret);
 208         } else if (ret & WM8994_VMID_SEL_MASK) {
 209                 dev_dbg(dev, "CODEC still active, ignoring suspend\n");
 210                 return 0;
 211         }
 212
 213         ret = wm8994_reg_read(wm8994, WM8994_POWER_MANAGEMENT_4);
 214         if (ret < 0) {
 215                 dev_err(dev, "Failed to read power status: %d\n", ret);
 216         } else if (ret & (WM8994_AIF2ADCL_ENA | WM8994_AIF2ADCR_ENA |
 217                           WM8994_AIF1ADC2L_ENA | WM8994_AIF1ADC2R_ENA |
 218                           WM8994_AIF1ADC1L_ENA | WM8994_AIF1ADC1R_ENA)) {
 219                 dev_dbg(dev, "CODEC still active, ignoring suspend\n");
 220                 return 0;
 221         }
 222
 223         ret = wm8994_reg_read(wm8994, WM8994_POWER_MANAGEMENT_5);
 224         if (ret < 0) {
 225                 dev_err(dev, "Failed to read power status: %d\n", ret);
 226         } else if (ret & (WM8994_AIF2DACL_ENA | WM8994_AIF2DACR_ENA |
 227                           WM8994_AIF1DAC2L_ENA | WM8994_AIF1DAC2R_ENA |
 228                           WM8994_AIF1DAC1L_ENA | WM8994_AIF1DAC1R_ENA)) {
 229                 dev_dbg(dev, "CODEC still active, ignoring suspend\n");
 230                 return 0;
 231         }
 232
 233         switch (wm8994->type) {
 234         case WM8958:
 235         case WM1811:
 236                 ret = wm8994_reg_read(wm8994, WM8958_MIC_DETECT_1);
 237                 if (ret < 0) {
 238                         dev_err(dev, "Failed to read power status: %d\n", ret);
 239                 } else if (ret & WM8958_MICD_ENA) {
 240                         dev_dbg(dev, "CODEC still active, ignoring suspend\n");
 241                         return 0;
 242                 }
 243                 break;
 244         default:
 245                 break;
 246         }
 247
 248         switch (wm8994->type) {
 249         case WM1811:
 250                 ret = wm8994_reg_read(wm8994, WM8994_ANTIPOP_2);
 251                 if (ret < 0) {
 252                         dev_err(dev, "Failed to read jackdet: %d\n", ret);
 253                 } else if (ret & WM1811_JACKDET_MODE_MASK) {
 254                         dev_dbg(dev, "CODEC still active, ignoring suspend\n");
 255                         return 0;
 256                 }
 257                 break;
 258         default:
 259                 break;
 260         }
 261
 262         /* Disable LDO pulldowns while the device is suspended if we
 263          * don't know that something will be driving them. */
 264         if (!wm8994->ldo_ena_always_driven)
 265                 wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,
 266                                 WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD,
 267                                 WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD);
 268
 269         /* Explicitly put the device into reset in case regulators
 270          * don't get disabled in order to ensure consistent restart.
 271          */
 272         wm8994_reg_write(wm8994, WM8994_SOFTWARE_RESET,
 273                          wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET));
 274
 275         regcache_mark_dirty(wm8994->regmap);
 276
 277         /* Restore GPIO registers to prevent problems with mismatched
 278          * pin configurations.
 279          */
 280         ret = regcache_sync_region(wm8994->regmap, WM8994_GPIO_1,
 281                                    WM8994_GPIO_11);
 282         if (ret != 0)
 283                 dev_err(dev, "Failed to restore GPIO registers: %d\n", ret);
 284
 285         /* In case one of the GPIOs is used as a wake input. */
 286         ret = regcache_sync_region(wm8994->regmap,
 287                                    WM8994_INTERRUPT_STATUS_1_MASK,
 288                                    WM8994_INTERRUPT_STATUS_1_MASK);
 289         if (ret != 0)
 290                 dev_err(dev, "Failed to restore interrupt mask: %d\n", ret);
 291
 292         regcache_cache_only(wm8994->regmap, true);
 293         wm8994->suspended = true;
 294
 295         ret = regulator_bulk_disable(wm8994->num_supplies,
 296                                      wm8994->supplies);
 297         if (ret != 0) {
 298                 dev_err(dev, "Failed to disable supplies: %d\n", ret);
 299                 return ret;
 300         }
 301
 302         return 0;
 303 }
 304
 305 static int wm8994_resume(struct device *dev)
 306 {
 307         struct wm8994 *wm8994 = dev_get_drvdata(dev);
 308         int ret;
 309
 310         /* We may have lied to the PM core about suspending */
 311         if (!wm8994->suspended)
 312                 return 0;
 313
 314         ret = regulator_bulk_enable(wm8994->num_supplies,
 315                                     wm8994->supplies);
 316         if (ret != 0) {
 317                 dev_err(dev, "Failed to enable supplies: %d\n", ret);
 318                 return ret;
 319         }
 320
 321         regcache_cache_only(wm8994->regmap, false);
 322         ret = regcache_sync(wm8994->regmap);
 323         if (ret != 0) {
 324                 dev_err(dev, "Failed to restore register map: %d\n", ret);
 325                 goto err_enable;
 326         }
 327
 328         /* Disable LDO pulldowns while the device is active */
 329         wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,
 330                         WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD,
 331                         0);
 332
 333         wm8994->suspended = false;
 334
 335         return 0;
 336
 337 err_enable:
 338         regulator_bulk_disable(wm8994->num_supplies, wm8994->supplies);
 339
 340         return ret;
 341 }
 342 #endif
 343
 344 #ifdef CONFIG_REGULATOR
 345 static int wm8994_ldo_in_use(struct wm8994_pdata *pdata, int ldo)
 346 {
 347         struct wm8994_ldo_pdata *ldo_pdata;
 348
 349         if (!pdata)
 350                 return 0;
 351
 352         ldo_pdata = &pdata->ldo[ldo];
 353
 354         if (!ldo_pdata->init_data)
 355                 return 0;
 356
 357         return ldo_pdata->init_data->num_consumer_supplies != 0;
 358 }
 359 #else
 360 static int wm8994_ldo_in_use(struct wm8994_pdata *pdata, int ldo)
 361 {
 362         return 0;
 363 }
 364 #endif
 365
 366 static const struct reg_default wm8994_revc_patch[] = {
 367         { 0x102, 0x3 },
 368         { 0x56, 0x3 },
 369         { 0x817, 0x0 },
 370         { 0x102, 0x0 },
 371 };
 372
 373 static const struct reg_default wm8958_reva_patch[] = {
 374         { 0x102, 0x3 },
 375         { 0xcb, 0x81 },
 376         { 0x817, 0x0 },
 377         { 0x102, 0x0 },
 378 };
 379
 380 static const struct reg_default wm1811_reva_patch[] = {
 381         { 0x102, 0x3 },
 382         { 0x56, 0xc07 },
 383         { 0x5d, 0x7e },
 384         { 0x5e, 0x0 },
 385         { 0x102, 0x0 },
 386 };
 387
 388 #ifdef CONFIG_OF
 389 static int wm8994_set_pdata_from_of(struct wm8994 *wm8994)
 390 {
 391         struct device_node *np = wm8994->dev->of_node;
 392         struct wm8994_pdata *pdata = &wm8994->pdata;
 393         int i;
 394
 395         if (!np)
 396                 return 0;
 397
 398         if (of_property_read_u32_array(np, "wlf,gpio-cfg", pdata->gpio_defaults,
 399                                        ARRAY_SIZE(pdata->gpio_defaults)) >= 0) {
 400                 for (i = 0; i < ARRAY_SIZE(pdata->gpio_defaults); i++) {
 401                         if (wm8994->pdata.gpio_defaults[i] == 0)
 402                                 pdata->gpio_defaults[i]
 403                                         = WM8994_CONFIGURE_GPIO;
 404                 }
 405         }
 406
 407         of_property_read_u32_array(np, "wlf,micbias-cfg", pdata->micbias,
 408                                    ARRAY_SIZE(pdata->micbias));
 409
 410         pdata->lineout1_diff = true;
 411         pdata->lineout2_diff = true;
 412         if (of_find_property(np, "wlf,lineout1-se", NULL))
 413                 pdata->lineout1_diff = false;
 414         if (of_find_property(np, "wlf,lineout2-se", NULL))
 415                 pdata->lineout2_diff = false;
 416
 417         if (of_find_property(np, "wlf,lineout1-feedback", NULL))
 418                 pdata->lineout1fb = true;
 419         if (of_find_property(np, "wlf,lineout2-feedback", NULL))
 420                 pdata->lineout2fb = true;
 421
 422         if (of_find_property(np, "wlf,ldoena-always-driven", NULL))
 423                 pdata->lineout2fb = true;
 424
 425         pdata->ldo[0].enable = of_get_named_gpio(np, "wlf,ldo1ena", 0);
 426         if (pdata->ldo[0].enable < 0)
 427                 pdata->ldo[0].enable = 0;
 428
 429         pdata->ldo[1].enable = of_get_named_gpio(np, "wlf,ldo2ena", 0);
 430         if (pdata->ldo[1].enable < 0)
 431                 pdata->ldo[1].enable = 0;
 432
 433         return 0;
 434 }
 435 #else
 436 static int wm8994_set_pdata_from_of(struct wm8994 *wm8994)
 437 {
 438         return 0;
 439 }
 440 #endif
 441
 442 /*
 443  * Instantiate the generic non-control parts of the device.
 444  */
 445 static int wm8994_device_init(struct wm8994 *wm8994, int irq)
 446 {
 447         struct wm8994_pdata *pdata;
 448         struct regmap_config *regmap_config;
 449         const struct reg_default *regmap_patch = NULL;
 450         const char *devname;
 451         int ret, i, patch_regs = 0;
 452         int pulls = 0;
 453
 454         if (dev_get_platdata(wm8994->dev)) {
 455                 pdata = dev_get_platdata(wm8994->dev);
 456                 wm8994->pdata = *pdata;
 457         }
 458         pdata = &wm8994->pdata;
 459
 460         ret = wm8994_set_pdata_from_of(wm8994);
 461         if (ret != 0)
 462                 return ret;
 463
 464         dev_set_drvdata(wm8994->dev, wm8994);
 465
 466         /* Add the on-chip regulators first for bootstrapping */
 467         ret = mfd_add_devices(wm8994->dev, -1,
 468                               wm8994_regulator_devs,
 469                               ARRAY_SIZE(wm8994_regulator_devs),
 470                               NULL, 0, NULL);
 471         if (ret != 0) {
 472                 dev_err(wm8994->dev, "Failed to add children: %d\n", ret);
 473                 goto err;
 474         }
 475
 476         switch (wm8994->type) {
 477         case WM1811:
 478                 wm8994->num_supplies = ARRAY_SIZE(wm1811_main_supplies);
 479                 break;
 480         case WM8994:
 481                 wm8994->num_supplies = ARRAY_SIZE(wm8994_main_supplies);
 482                 break;
 483         case WM8958:
 484                 wm8994->num_supplies = ARRAY_SIZE(wm8958_main_supplies);
 485                 break;
 486         default:
 487                 BUG();
 488                 goto err;
 489         }
 490
 491         wm8994->supplies = devm_kzalloc(wm8994->dev,
 492                                         sizeof(struct regulator_bulk_data) *
 493                                         wm8994->num_supplies, GFP_KERNEL);
 494         if (!wm8994->supplies) {
 495                 ret = -ENOMEM;
 496                 goto err;
 497         }
 498
 499         switch (wm8994->type) {
 500         case WM1811:
 501                 for (i = 0; i < ARRAY_SIZE(wm1811_main_supplies); i++)
 502                         wm8994->supplies[i].supply = wm1811_main_supplies[i];
 503                 break;
 504         case WM8994:
 505                 for (i = 0; i < ARRAY_SIZE(wm8994_main_supplies); i++)
 506                         wm8994->supplies[i].supply = wm8994_main_supplies[i];
 507                 break;
 508         case WM8958:
 509                 for (i = 0; i < ARRAY_SIZE(wm8958_main_supplies); i++)
 510                         wm8994->supplies[i].supply = wm8958_main_supplies[i];
 511                 break;
 512         default:
 513                 BUG();
 514                 goto err;
 515         }
 516
 517         ret = devm_regulator_bulk_get(wm8994->dev, wm8994->num_supplies,
 518                                  wm8994->supplies);
 519         if (ret != 0) {
 520                 dev_err(wm8994->dev, "Failed to get supplies: %d\n", ret);
 521                 goto err;
 522         }
 523
 524         ret = regulator_bulk_enable(wm8994->num_supplies,
 525                                     wm8994->supplies);
 526         if (ret != 0) {
 527                 dev_err(wm8994->dev, "Failed to enable supplies: %d\n", ret);
 528                 goto err;
 529         }
 530
 531         ret = wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET);
 532         if (ret < 0) {
 533                 dev_err(wm8994->dev, "Failed to read ID register\n");
 534                 goto err_enable;
 535         }
 536         switch (ret) {
 537         case 0x1811:
 538                 devname = "WM1811";
 539                 if (wm8994->type != WM1811)
 540                         dev_warn(wm8994->dev, "Device registered as type %d\n",
 541                                  wm8994->type);
 542                 wm8994->type = WM1811;
 543                 break;
 544         case 0x8994:
 545                 devname = "WM8994";
 546                 if (wm8994->type != WM8994)
 547                         dev_warn(wm8994->dev, "Device registered as type %d\n",
 548                                  wm8994->type);
 549                 wm8994->type = WM8994;
 550                 break;
 551         case 0x8958:
 552                 devname = "WM8958";
 553                 if (wm8994->type != WM8958)
 554                         dev_warn(wm8994->dev, "Device registered as type %d\n",
 555                                  wm8994->type);
 556                 wm8994->type = WM8958;
 557                 break;
 558         default:
 559                 dev_err(wm8994->dev, "Device is not a WM8994, ID is %x\n",
 560                         ret);
 561                 ret = -EINVAL;
 562                 goto err_enable;
 563         }
 564
 565         ret = wm8994_reg_read(wm8994, WM8994_CHIP_REVISION);
 566         if (ret < 0) {
 567                 dev_err(wm8994->dev, "Failed to read revision register: %d\n",
 568                         ret);
 569                 goto err_enable;
 570         }
 571         wm8994->revision = ret & WM8994_CHIP_REV_MASK;
 572         wm8994->cust_id = (ret & WM8994_CUST_ID_MASK) >> WM8994_CUST_ID_SHIFT;
 573
 574         switch (wm8994->type) {
 575         case WM8994:
 576                 switch (wm8994->revision) {
 577                 case 0:
 578                 case 1:
 579                         dev_warn(wm8994->dev,
 580                                  "revision %c not fully supported\n",
 581                                  'A' + wm8994->revision);
 582                         break;
 583                 case 2:
 584                 case 3:
 585                 default:
 586                         regmap_patch = wm8994_revc_patch;
 587                         patch_regs = ARRAY_SIZE(wm8994_revc_patch);
 588                         break;
 589                 }
 590                 break;
 591
 592         case WM8958:
 593                 switch (wm8994->revision) {
 594                 case 0:
 595                         regmap_patch = wm8958_reva_patch;
 596                         patch_regs = ARRAY_SIZE(wm8958_reva_patch);
 597                         break;
 598                 default:
 599                         break;
 600                 }
 601                 break;
 602
 603         case WM1811:
 604                 /* Revision C did not change the relevant layer */
 605                 if (wm8994->revision > 1)
 606                         wm8994->revision++;
 607
 608                 regmap_patch = wm1811_reva_patch;
 609                 patch_regs = ARRAY_SIZE(wm1811_reva_patch);
 610                 break;
 611
 612         default:
 613                 break;
 614         }
 615
 616         dev_info(wm8994->dev, "%s revision %c CUST_ID %02x\n", devname,
 617                  'A' + wm8994->revision, wm8994->cust_id);
 618
 619         switch (wm8994->type) {
 620         case WM1811:
 621                 regmap_config = &wm1811_regmap_config;
 622                 break;
 623         case WM8994:
 624                 regmap_config = &wm8994_regmap_config;
 625                 break;
 626         case WM8958:
 627                 regmap_config = &wm8958_regmap_config;
 628                 break;
 629         default:
 630                 dev_err(wm8994->dev, "Unknown device type %d\n", wm8994->type);
 631                 return -EINVAL;
 632         }
 633
 634         ret = regmap_reinit_cache(wm8994->regmap, regmap_config);
 635         if (ret != 0) {
 636                 dev_err(wm8994->dev, "Failed to reinit register cache: %d\n",
 637                         ret);
 638                 return ret;
 639         }
 640
 641         /* Explicitly put the device into reset in case regulators
 642          * don't get disabled in order to ensure we know the device
 643          * state.
 644          */
 645         ret = wm8994_reg_write(wm8994, WM8994_SOFTWARE_RESET,
 646                                wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET));
 647         if (ret != 0) {
 648                 dev_err(wm8994->dev, "Failed to reset device: %d\n", ret);
 649                 return ret;
 650         }
 651
 652         if (regmap_patch) {
 653                 ret = regmap_register_patch(wm8994->regmap, regmap_patch,
 654                                             patch_regs);
 655                 if (ret != 0) {
 656                         dev_err(wm8994->dev, "Failed to register patch: %d\n",
 657                                 ret);
 658                         goto err;
 659                 }
 660         }
 661
 662         wm8994->irq_base = pdata->irq_base;
 663         wm8994->gpio_base = pdata->gpio_base;
 664
 665         /* GPIO configuration is only applied if it's non-zero */
 666         for (i = 0; i < ARRAY_SIZE(pdata->gpio_defaults); i++) {
 667                 if (pdata->gpio_defaults[i]) {
 668                         wm8994_set_bits(wm8994, WM8994_GPIO_1 + i,
 669                                         0xffff, pdata->gpio_defaults[i]);
 670                 }
 671         }
 672
 673         wm8994->ldo_ena_always_driven = pdata->ldo_ena_always_driven;
 674
 675         if (pdata->spkmode_pu)
 676                 pulls |= WM8994_SPKMODE_PU;
 677
 678         /* Disable unneeded pulls */
 679         wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2,
 680                         WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD |
 681                         WM8994_SPKMODE_PU | WM8994_CSNADDR_PD,
 682                         pulls);
 683
 684         /* In some system designs where the regulators are not in use,
 685          * we can achieve a small reduction in leakage currents by
 686          * floating LDO outputs.  This bit makes no difference if the
 687          * LDOs are enabled, it only affects cases where the LDOs were
 688          * in operation and are then disabled.
 689          */
 690         for (i = 0; i < WM8994_NUM_LDO_REGS; i++) {
 691                 if (wm8994_ldo_in_use(pdata, i))
 692                         wm8994_set_bits(wm8994, WM8994_LDO_1 + i,
 693                                         WM8994_LDO1_DISCH, WM8994_LDO1_DISCH);
 694                 else
 695                         wm8994_set_bits(wm8994, WM8994_LDO_1 + i,
 696                                         WM8994_LDO1_DISCH, 0);
 697         }
 698
 699         wm8994_irq_init(wm8994);
 700
 701         ret = mfd_add_devices(wm8994->dev, -1,
 702                               wm8994_devs, ARRAY_SIZE(wm8994_devs),
 703                               NULL, 0, NULL);
 704         if (ret != 0) {
 705                 dev_err(wm8994->dev, "Failed to add children: %d\n", ret);
 706                 goto err_irq;
 707         }
 708
 709         pm_runtime_enable(wm8994->dev);
 710         pm_runtime_idle(wm8994->dev);
 711
 712         return 0;
 713
 714 err_irq:
 715         wm8994_irq_exit(wm8994);
 716 err_enable:
 717         regulator_bulk_disable(wm8994->num_supplies,
 718                                wm8994->supplies);
 719 err:
 720         mfd_remove_devices(wm8994->dev);
 721         return ret;
 722 }
 723
 724 static void wm8994_device_exit(struct wm8994 *wm8994)
 725 {
 726         pm_runtime_disable(wm8994->dev);
 727         mfd_remove_devices(wm8994->dev);
 728         wm8994_irq_exit(wm8994);
 729         regulator_bulk_disable(wm8994->num_supplies,
 730                                wm8994->supplies);
 731 }
 732
 733 static const struct of_device_id wm8994_of_match[] = {
 734         { .compatible = "wlf,wm1811", .data = (void *)WM1811 },
 735         { .compatible = "wlf,wm8994", .data = (void *)WM8994 },
 736         { .compatible = "wlf,wm8958", .data = (void *)WM8958 },
 737         { }
 738 };
 739 MODULE_DEVICE_TABLE(of, wm8994_of_match);
 740
 741 static int wm8994_i2c_probe(struct i2c_client *i2c,
 742                                       const struct i2c_device_id *id)
 743 {
 744         const struct of_device_id *of_id;
 745         struct wm8994 *wm8994;
 746         int ret;
 747
 748         wm8994 = devm_kzalloc(&i2c->dev, sizeof(struct wm8994), GFP_KERNEL);
 749         if (wm8994 == NULL)
 750                 return -ENOMEM;
 751
 752         i2c_set_clientdata(i2c, wm8994);
 753         wm8994->dev = &i2c->dev;
 754         wm8994->irq = i2c->irq;
 755
 756         if (i2c->dev.of_node) {
 757                 of_id = of_match_device(wm8994_of_match, &i2c->dev);
 758                 if (of_id)
 759                         wm8994->type = (int)of_id->data;
 760         } else {
 761                 wm8994->type = id->driver_data;
 762         }
 763
 764         wm8994->regmap = devm_regmap_init_i2c(i2c, &wm8994_base_regmap_config);
 765         if (IS_ERR(wm8994->regmap)) {
 766                 ret = PTR_ERR(wm8994->regmap);
 767                 dev_err(wm8994->dev, "Failed to allocate register map: %d\n",
 768                         ret);
 769                 return ret;
 770         }
 771
 772         return wm8994_device_init(wm8994, i2c->irq);
 773 }
 774
 775 static int wm8994_i2c_remove(struct i2c_client *i2c)
 776 {
 777         struct wm8994 *wm8994 = i2c_get_clientdata(i2c);
 778
 779         wm8994_device_exit(wm8994);
 780
 781         return 0;
 782 }
 783
 784 static const struct i2c_device_id wm8994_i2c_id[] = {
 785         { "wm1811", WM1811 },
 786         { "wm1811a", WM1811 },
 787         { "wm8994", WM8994 },
 788         { "wm8958", WM8958 },
 789         { }
 790 };
 791 MODULE_DEVICE_TABLE(i2c, wm8994_i2c_id);
 792
 793 static const struct dev_pm_ops wm8994_pm_ops = {
 794         SET_RUNTIME_PM_OPS(wm8994_suspend, wm8994_resume, NULL)
 795 };
 796
 797 static struct i2c_driver wm8994_i2c_driver = {
 798         .driver = {
 799                 .name = "wm8994",
 800                 .owner = THIS_MODULE,
 801                 .pm = &wm8994_pm_ops,
 802                 .of_match_table = of_match_ptr(wm8994_of_match),
 803         },
 804         .probe = wm8994_i2c_probe,
 805         .remove = wm8994_i2c_remove,
 806         .id_table = wm8994_i2c_id,
 807 };
 808
 809 module_i2c_driver(wm8994_i2c_driver);
 810
 811 MODULE_DESCRIPTION("Core support for the WM8994 audio CODEC");
 812 MODULE_LICENSE("GPL");
 813 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");