kernel/sound/soc/codecs/wm8741.c

   1 /*
   2  * wm8741.c  --  WM8741 ALSA SoC Audio driver
   3  *
   4  * Copyright 2010-1 Wolfson Microelectronics plc
   5  *
   6  * Author: Ian Lartey <ian@opensource.wolfsonmicro.com>
   7  *
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/moduleparam.h>
  16 #include <linux/init.h>
  17 #include <linux/delay.h>
  18 #include <linux/pm.h>
  19 #include <linux/i2c.h>
  20 #include <linux/spi/spi.h>
  21 #include <linux/regmap.h>
  22 #include <linux/regulator/consumer.h>
  23 #include <linux/slab.h>
  24 #include <linux/of_device.h>
  25 #include <sound/core.h>
  26 #include <sound/pcm.h>
  27 #include <sound/pcm_params.h>
  28 #include <sound/soc.h>
  29 #include <sound/initval.h>
  30 #include <sound/tlv.h>
  31
  32 #include "wm8741.h"
  33
  34 #define WM8741_NUM_SUPPLIES 2
  35 static const char *wm8741_supply_names[WM8741_NUM_SUPPLIES] = {
  36         "AVDD",
  37         "DVDD",
  38 };
  39
  40 #define WM8741_NUM_RATES 6
  41
  42 /* codec private data */
  43 struct wm8741_priv {
  44         struct regmap *regmap;
  45         struct regulator_bulk_data supplies[WM8741_NUM_SUPPLIES];
  46         unsigned int sysclk;
  47         const struct snd_pcm_hw_constraint_list *sysclk_constraints;
  48 };
  49
  50 static const struct reg_default wm8741_reg_defaults[] = {
  51         {  0, 0x0000 },     /* R0  - DACLLSB Attenuation */
  52         {  1, 0x0000 },     /* R1  - DACLMSB Attenuation */
  53         {  2, 0x0000 },     /* R2  - DACRLSB Attenuation */
  54         {  3, 0x0000 },     /* R3  - DACRMSB Attenuation */
  55         {  4, 0x0000 },     /* R4  - Volume Control */
  56         {  5, 0x000A },     /* R5  - Format Control */
  57         {  6, 0x0000 },     /* R6  - Filter Control */
  58         {  7, 0x0000 },     /* R7  - Mode Control 1 */
  59         {  8, 0x0002 },     /* R8  - Mode Control 2 */
  60         { 32, 0x0002 },     /* R32 - ADDITONAL_CONTROL_1 */
  61 };
  62
  63 static bool wm8741_readable(struct device *dev, unsigned int reg)
  64 {
  65         switch (reg) {
  66         case WM8741_DACLLSB_ATTENUATION:
  67         case WM8741_DACLMSB_ATTENUATION:
  68         case WM8741_DACRLSB_ATTENUATION:
  69         case WM8741_DACRMSB_ATTENUATION:
  70         case WM8741_VOLUME_CONTROL:
  71         case WM8741_FORMAT_CONTROL:
  72         case WM8741_FILTER_CONTROL:
  73         case WM8741_MODE_CONTROL_1:
  74         case WM8741_MODE_CONTROL_2:
  75         case WM8741_ADDITIONAL_CONTROL_1:
  76                 return true;
  77         default:
  78                 return false;
  79         }
  80 }
  81
  82 static int wm8741_reset(struct snd_soc_codec *codec)
  83 {
  84         return snd_soc_write(codec, WM8741_RESET, 0);
  85 }
  86
  87 static const DECLARE_TLV_DB_SCALE(dac_tlv_fine, -12700, 13, 0);
  88 static const DECLARE_TLV_DB_SCALE(dac_tlv, -12700, 400, 0);
  89
  90 static const struct snd_kcontrol_new wm8741_snd_controls[] = {
  91 SOC_DOUBLE_R_TLV("Fine Playback Volume", WM8741_DACLLSB_ATTENUATION,
  92                  WM8741_DACRLSB_ATTENUATION, 1, 255, 1, dac_tlv_fine),
  93 SOC_DOUBLE_R_TLV("Playback Volume", WM8741_DACLMSB_ATTENUATION,
  94                  WM8741_DACRMSB_ATTENUATION, 0, 511, 1, dac_tlv),
  95 };
  96
  97 static const struct snd_soc_dapm_widget wm8741_dapm_widgets[] = {
  98 SND_SOC_DAPM_DAC("DACL", "Playback", SND_SOC_NOPM, 0, 0),
  99 SND_SOC_DAPM_DAC("DACR", "Playback", SND_SOC_NOPM, 0, 0),
 100 SND_SOC_DAPM_OUTPUT("VOUTLP"),
 101 SND_SOC_DAPM_OUTPUT("VOUTLN"),
 102 SND_SOC_DAPM_OUTPUT("VOUTRP"),
 103 SND_SOC_DAPM_OUTPUT("VOUTRN"),
 104 };
 105
 106 static const struct snd_soc_dapm_route wm8741_dapm_routes[] = {
 107         { "VOUTLP", NULL, "DACL" },
 108         { "VOUTLN", NULL, "DACL" },
 109         { "VOUTRP", NULL, "DACR" },
 110         { "VOUTRN", NULL, "DACR" },
 111 };
 112
 113 static struct {
 114         int value;
 115         int ratio;
 116 } lrclk_ratios[WM8741_NUM_RATES] = {
 117         { 1, 128 },
 118         { 2, 192 },
 119         { 3, 256 },
 120         { 4, 384 },
 121         { 5, 512 },
 122         { 6, 768 },
 123 };
 124
 125 static const unsigned int rates_11289[] = {
 126         44100, 88200,
 127 };
 128
 129 static const struct snd_pcm_hw_constraint_list constraints_11289 = {
 130         .count  = ARRAY_SIZE(rates_11289),
 131         .list   = rates_11289,
 132 };
 133
 134 static const unsigned int rates_12288[] = {
 135         32000, 48000, 96000,
 136 };
 137
 138 static const struct snd_pcm_hw_constraint_list constraints_12288 = {
 139         .count  = ARRAY_SIZE(rates_12288),
 140         .list   = rates_12288,
 141 };
 142
 143 static const unsigned int rates_16384[] = {
 144         32000,
 145 };
 146
 147 static const struct snd_pcm_hw_constraint_list constraints_16384 = {
 148         .count  = ARRAY_SIZE(rates_16384),
 149         .list   = rates_16384,
 150 };
 151
 152 static const unsigned int rates_16934[] = {
 153         44100, 88200,
 154 };
 155
 156 static const struct snd_pcm_hw_constraint_list constraints_16934 = {
 157         .count  = ARRAY_SIZE(rates_16934),
 158         .list   = rates_16934,
 159 };
 160
 161 static const unsigned int rates_18432[] = {
 162         48000, 96000,
 163 };
 164
 165 static const struct snd_pcm_hw_constraint_list constraints_18432 = {
 166         .count  = ARRAY_SIZE(rates_18432),
 167         .list   = rates_18432,
 168 };
 169
 170 static const unsigned int rates_22579[] = {
 171         44100, 88200, 176400
 172 };
 173
 174 static const struct snd_pcm_hw_constraint_list constraints_22579 = {
 175         .count  = ARRAY_SIZE(rates_22579),
 176         .list   = rates_22579,
 177 };
 178
 179 static const unsigned int rates_24576[] = {
 180         32000, 48000, 96000, 192000
 181 };
 182
 183 static const struct snd_pcm_hw_constraint_list constraints_24576 = {
 184         .count  = ARRAY_SIZE(rates_24576),
 185         .list   = rates_24576,
 186 };
 187
 188 static const unsigned int rates_36864[] = {
 189         48000, 96000, 192000
 190 };
 191
 192 static const struct snd_pcm_hw_constraint_list constraints_36864 = {
 193         .count  = ARRAY_SIZE(rates_36864),
 194         .list   = rates_36864,
 195 };
 196
 197
 198 static int wm8741_startup(struct snd_pcm_substream *substream,
 199                           struct snd_soc_dai *dai)
 200 {
 201         struct snd_soc_codec *codec = dai->codec;
 202         struct wm8741_priv *wm8741 = snd_soc_codec_get_drvdata(codec);
 203
 204         /* The set of sample rates that can be supported depends on the
 205          * MCLK supplied to the CODEC - enforce this.
 206          */
 207         if (!wm8741->sysclk) {
 208                 dev_err(codec->dev,
 209                         "No MCLK configured, call set_sysclk() on init\n");
 210                 return -EINVAL;
 211         }
 212
 213         snd_pcm_hw_constraint_list(substream->runtime, 0,
 214                                    SNDRV_PCM_HW_PARAM_RATE,
 215                                    wm8741->sysclk_constraints);
 216
 217         return 0;
 218 }
 219
 220 static int wm8741_hw_params(struct snd_pcm_substream *substream,
 221                             struct snd_pcm_hw_params *params,
 222                             struct snd_soc_dai *dai)
 223 {
 224         struct snd_soc_codec *codec = dai->codec;
 225         struct wm8741_priv *wm8741 = snd_soc_codec_get_drvdata(codec);
 226         u16 iface = snd_soc_read(codec, WM8741_FORMAT_CONTROL) & 0x1FC;
 227         int i;
 228
 229         /* Find a supported LRCLK ratio */
 230         for (i = 0; i < ARRAY_SIZE(lrclk_ratios); i++) {
 231                 if (wm8741->sysclk / params_rate(params) ==
 232                     lrclk_ratios[i].ratio)
 233                         break;
 234         }
 235
 236         /* Should never happen, should be handled by constraints */
 237         if (i == ARRAY_SIZE(lrclk_ratios)) {
 238                 dev_err(codec->dev, "MCLK/fs ratio %d unsupported\n",
 239                         wm8741->sysclk / params_rate(params));
 240                 return -EINVAL;
 241         }
 242
 243         /* bit size */
 244         switch (params_width(params)) {
 245         case 16:
 246                 break;
 247         case 20:
 248                 iface |= 0x0001;
 249                 break;
 250         case 24:
 251                 iface |= 0x0002;
 252                 break;
 253         case 32:
 254                 iface |= 0x0003;
 255                 break;
 256         default:
 257                 dev_dbg(codec->dev, "wm8741_hw_params:    Unsupported bit size param = %d",
 258                         params_width(params));
 259                 return -EINVAL;
 260         }
 261
 262         dev_dbg(codec->dev, "wm8741_hw_params:    bit size param = %d",
 263                 params_width(params));
 264
 265         snd_soc_write(codec, WM8741_FORMAT_CONTROL, iface);
 266         return 0;
 267 }
 268
 269 static int wm8741_set_dai_sysclk(struct snd_soc_dai *codec_dai,
 270                 int clk_id, unsigned int freq, int dir)
 271 {
 272         struct snd_soc_codec *codec = codec_dai->codec;
 273         struct wm8741_priv *wm8741 = snd_soc_codec_get_drvdata(codec);
 274
 275         dev_dbg(codec->dev, "wm8741_set_dai_sysclk info: freq=%dHz\n", freq);
 276
 277         switch (freq) {
 278         case 11289600:
 279                 wm8741->sysclk_constraints = &constraints_11289;
 280                 wm8741->sysclk = freq;
 281                 return 0;
 282
 283         case 12288000:
 284                 wm8741->sysclk_constraints = &constraints_12288;
 285                 wm8741->sysclk = freq;
 286                 return 0;
 287
 288         case 16384000:
 289                 wm8741->sysclk_constraints = &constraints_16384;
 290                 wm8741->sysclk = freq;
 291                 return 0;
 292
 293         case 16934400:
 294                 wm8741->sysclk_constraints = &constraints_16934;
 295                 wm8741->sysclk = freq;
 296                 return 0;
 297
 298         case 18432000:
 299                 wm8741->sysclk_constraints = &constraints_18432;
 300                 wm8741->sysclk = freq;
 301                 return 0;
 302
 303         case 22579200:
 304         case 33868800:
 305                 wm8741->sysclk_constraints = &constraints_22579;
 306                 wm8741->sysclk = freq;
 307                 return 0;
 308
 309         case 24576000:
 310                 wm8741->sysclk_constraints = &constraints_24576;
 311                 wm8741->sysclk = freq;
 312                 return 0;
 313
 314         case 36864000:
 315                 wm8741->sysclk_constraints = &constraints_36864;
 316                 wm8741->sysclk = freq;
 317                 return 0;
 318         }
 319         return -EINVAL;
 320 }
 321
 322 static int wm8741_set_dai_fmt(struct snd_soc_dai *codec_dai,
 323                 unsigned int fmt)
 324 {
 325         struct snd_soc_codec *codec = codec_dai->codec;
 326         u16 iface = snd_soc_read(codec, WM8741_FORMAT_CONTROL) & 0x1C3;
 327
 328         /* check master/slave audio interface */
 329         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 330         case SND_SOC_DAIFMT_CBS_CFS:
 331                 break;
 332         default:
 333                 return -EINVAL;
 334         }
 335
 336         /* interface format */
 337         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 338         case SND_SOC_DAIFMT_I2S:
 339                 iface |= 0x0008;
 340                 break;
 341         case SND_SOC_DAIFMT_RIGHT_J:
 342                 break;
 343         case SND_SOC_DAIFMT_LEFT_J:
 344                 iface |= 0x0004;
 345                 break;
 346         case SND_SOC_DAIFMT_DSP_A:
 347                 iface |= 0x000C;
 348                 break;
 349         case SND_SOC_DAIFMT_DSP_B:
 350                 iface |= 0x001C;
 351                 break;
 352         default:
 353                 return -EINVAL;
 354         }
 355
 356         /* clock inversion */
 357         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 358         case SND_SOC_DAIFMT_NB_NF:
 359                 break;
 360         case SND_SOC_DAIFMT_IB_IF:
 361                 iface |= 0x0010;
 362                 break;
 363         case SND_SOC_DAIFMT_IB_NF:
 364                 iface |= 0x0020;
 365                 break;
 366         case SND_SOC_DAIFMT_NB_IF:
 367                 iface |= 0x0030;
 368                 break;
 369         default:
 370                 return -EINVAL;
 371         }
 372
 373
 374         dev_dbg(codec->dev, "wm8741_set_dai_fmt:    Format=%x, Clock Inv=%x\n",
 375                                 fmt & SND_SOC_DAIFMT_FORMAT_MASK,
 376                                 ((fmt & SND_SOC_DAIFMT_INV_MASK)));
 377
 378         snd_soc_write(codec, WM8741_FORMAT_CONTROL, iface);
 379         return 0;
 380 }
 381
 382 #define WM8741_RATES (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
 383                         SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | \
 384                         SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_176400 | \
 385                         SNDRV_PCM_RATE_192000)
 386
 387 #define WM8741_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
 388                         SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE)
 389
 390 static const struct snd_soc_dai_ops wm8741_dai_ops = {
 391         .startup        = wm8741_startup,
 392         .hw_params      = wm8741_hw_params,
 393         .set_sysclk     = wm8741_set_dai_sysclk,
 394         .set_fmt        = wm8741_set_dai_fmt,
 395 };
 396
 397 static struct snd_soc_dai_driver wm8741_dai = {
 398         .name = "wm8741",
 399         .playback = {
 400                 .stream_name = "Playback",
 401                 .channels_min = 2,  /* Mono modes not yet supported */
 402                 .channels_max = 2,
 403                 .rates = WM8741_RATES,
 404                 .formats = WM8741_FORMATS,
 405         },
 406         .ops = &wm8741_dai_ops,
 407 };
 408
 409 #ifdef CONFIG_PM
 410 static int wm8741_resume(struct snd_soc_codec *codec)
 411 {
 412         snd_soc_cache_sync(codec);
 413         return 0;
 414 }
 415 #else
 416 #define wm8741_resume NULL
 417 #endif
 418
 419 static int wm8741_probe(struct snd_soc_codec *codec)
 420 {
 421         struct wm8741_priv *wm8741 = snd_soc_codec_get_drvdata(codec);
 422         int ret = 0;
 423
 424         ret = regulator_bulk_enable(ARRAY_SIZE(wm8741->supplies),
 425                                     wm8741->supplies);
 426         if (ret != 0) {
 427                 dev_err(codec->dev, "Failed to enable supplies: %d\n", ret);
 428                 goto err_get;
 429         }
 430
 431         ret = wm8741_reset(codec);
 432         if (ret < 0) {
 433                 dev_err(codec->dev, "Failed to issue reset\n");
 434                 goto err_enable;
 435         }
 436
 437         /* Change some default settings - latch VU */
 438         snd_soc_update_bits(codec, WM8741_DACLLSB_ATTENUATION,
 439                             WM8741_UPDATELL, WM8741_UPDATELL);
 440         snd_soc_update_bits(codec, WM8741_DACLMSB_ATTENUATION,
 441                             WM8741_UPDATELM, WM8741_UPDATELM);
 442         snd_soc_update_bits(codec, WM8741_DACRLSB_ATTENUATION,
 443                             WM8741_UPDATERL, WM8741_UPDATERL);
 444         snd_soc_update_bits(codec, WM8741_DACRMSB_ATTENUATION,
 445                             WM8741_UPDATERM, WM8741_UPDATERM);
 446
 447         dev_dbg(codec->dev, "Successful registration\n");
 448         return ret;
 449
 450 err_enable:
 451         regulator_bulk_disable(ARRAY_SIZE(wm8741->supplies), wm8741->supplies);
 452 err_get:
 453         return ret;
 454 }
 455
 456 static int wm8741_remove(struct snd_soc_codec *codec)
 457 {
 458         struct wm8741_priv *wm8741 = snd_soc_codec_get_drvdata(codec);
 459
 460         regulator_bulk_disable(ARRAY_SIZE(wm8741->supplies), wm8741->supplies);
 461
 462         return 0;
 463 }
 464
 465 static struct snd_soc_codec_driver soc_codec_dev_wm8741 = {
 466         .probe =        wm8741_probe,
 467         .remove =       wm8741_remove,
 468         .resume =       wm8741_resume,
 469
 470         .controls = wm8741_snd_controls,
 471         .num_controls = ARRAY_SIZE(wm8741_snd_controls),
 472         .dapm_widgets = wm8741_dapm_widgets,
 473         .num_dapm_widgets = ARRAY_SIZE(wm8741_dapm_widgets),
 474         .dapm_routes = wm8741_dapm_routes,
 475         .num_dapm_routes = ARRAY_SIZE(wm8741_dapm_routes),
 476 };
 477
 478 static const struct of_device_id wm8741_of_match[] = {
 479         { .compatible = "wlf,wm8741", },
 480         { }
 481 };
 482 MODULE_DEVICE_TABLE(of, wm8741_of_match);
 483
 484 static const struct regmap_config wm8741_regmap = {
 485         .reg_bits = 7,
 486         .val_bits = 9,
 487         .max_register = WM8741_MAX_REGISTER,
 488
 489         .reg_defaults = wm8741_reg_defaults,
 490         .num_reg_defaults = ARRAY_SIZE(wm8741_reg_defaults),
 491         .cache_type = REGCACHE_RBTREE,
 492
 493         .readable_reg = wm8741_readable,
 494 };
 495
 496 #if IS_ENABLED(CONFIG_I2C)
 497 static int wm8741_i2c_probe(struct i2c_client *i2c,
 498                             const struct i2c_device_id *id)
 499 {
 500         struct wm8741_priv *wm8741;
 501         int ret, i;
 502
 503         wm8741 = devm_kzalloc(&i2c->dev, sizeof(struct wm8741_priv),
 504                               GFP_KERNEL);
 505         if (wm8741 == NULL)
 506                 return -ENOMEM;
 507
 508         for (i = 0; i < ARRAY_SIZE(wm8741->supplies); i++)
 509                 wm8741->supplies[i].supply = wm8741_supply_names[i];
 510
 511         ret = devm_regulator_bulk_get(&i2c->dev, ARRAY_SIZE(wm8741->supplies),
 512                                       wm8741->supplies);
 513         if (ret != 0) {
 514                 dev_err(&i2c->dev, "Failed to request supplies: %d\n", ret);
 515                 return ret;
 516         }
 517
 518         wm8741->regmap = devm_regmap_init_i2c(i2c, &wm8741_regmap);
 519         if (IS_ERR(wm8741->regmap)) {
 520                 ret = PTR_ERR(wm8741->regmap);
 521                 dev_err(&i2c->dev, "Failed to init regmap: %d\n", ret);
 522                 return ret;
 523         }
 524
 525         i2c_set_clientdata(i2c, wm8741);
 526
 527         ret = snd_soc_register_codec(&i2c->dev,
 528                                      &soc_codec_dev_wm8741, &wm8741_dai, 1);
 529
 530         return ret;
 531 }
 532
 533 static int wm8741_i2c_remove(struct i2c_client *client)
 534 {
 535         snd_soc_unregister_codec(&client->dev);
 536         return 0;
 537 }
 538
 539 static const struct i2c_device_id wm8741_i2c_id[] = {
 540         { "wm8741", 0 },
 541         { }
 542 };
 543 MODULE_DEVICE_TABLE(i2c, wm8741_i2c_id);
 544
 545 static struct i2c_driver wm8741_i2c_driver = {
 546         .driver = {
 547                 .name = "wm8741",
 548                 .owner = THIS_MODULE,
 549                 .of_match_table = wm8741_of_match,
 550         },
 551         .probe =    wm8741_i2c_probe,
 552         .remove =   wm8741_i2c_remove,
 553         .id_table = wm8741_i2c_id,
 554 };
 555 #endif
 556
 557 #if defined(CONFIG_SPI_MASTER)
 558 static int wm8741_spi_probe(struct spi_device *spi)
 559 {
 560         struct wm8741_priv *wm8741;
 561         int ret, i;
 562
 563         wm8741 = devm_kzalloc(&spi->dev, sizeof(struct wm8741_priv),
 564                              GFP_KERNEL);
 565         if (wm8741 == NULL)
 566                 return -ENOMEM;
 567
 568         for (i = 0; i < ARRAY_SIZE(wm8741->supplies); i++)
 569                 wm8741->supplies[i].supply = wm8741_supply_names[i];
 570
 571         ret = devm_regulator_bulk_get(&spi->dev, ARRAY_SIZE(wm8741->supplies),
 572                                       wm8741->supplies);
 573         if (ret != 0) {
 574                 dev_err(&spi->dev, "Failed to request supplies: %d\n", ret);
 575                 return ret;
 576         }
 577
 578         wm8741->regmap = devm_regmap_init_spi(spi, &wm8741_regmap);
 579         if (IS_ERR(wm8741->regmap)) {
 580                 ret = PTR_ERR(wm8741->regmap);
 581                 dev_err(&spi->dev, "Failed to init regmap: %d\n", ret);
 582                 return ret;
 583         }
 584
 585         spi_set_drvdata(spi, wm8741);
 586
 587         ret = snd_soc_register_codec(&spi->dev,
 588                         &soc_codec_dev_wm8741, &wm8741_dai, 1);
 589         return ret;
 590 }
 591
 592 static int wm8741_spi_remove(struct spi_device *spi)
 593 {
 594         snd_soc_unregister_codec(&spi->dev);
 595         return 0;
 596 }
 597
 598 static struct spi_driver wm8741_spi_driver = {
 599         .driver = {
 600                 .name   = "wm8741",
 601                 .owner  = THIS_MODULE,
 602                 .of_match_table = wm8741_of_match,
 603         },
 604         .probe          = wm8741_spi_probe,
 605         .remove         = wm8741_spi_remove,
 606 };
 607 #endif /* CONFIG_SPI_MASTER */
 608
 609 static int __init wm8741_modinit(void)
 610 {
 611         int ret = 0;
 612
 613 #if IS_ENABLED(CONFIG_I2C)
 614         ret = i2c_add_driver(&wm8741_i2c_driver);
 615         if (ret != 0)
 616                 pr_err("Failed to register WM8741 I2C driver: %d\n", ret);
 617 #endif
 618 #if defined(CONFIG_SPI_MASTER)
 619         ret = spi_register_driver(&wm8741_spi_driver);
 620         if (ret != 0) {
 621                 printk(KERN_ERR "Failed to register wm8741 SPI driver: %d\n",
 622                        ret);
 623         }
 624 #endif
 625
 626         return ret;
 627 }
 628 module_init(wm8741_modinit);
 629
 630 static void __exit wm8741_exit(void)
 631 {
 632 #if defined(CONFIG_SPI_MASTER)
 633         spi_unregister_driver(&wm8741_spi_driver);
 634 #endif
 635 #if IS_ENABLED(CONFIG_I2C)
 636         i2c_del_driver(&wm8741_i2c_driver);
 637 #endif
 638 }
 639 module_exit(wm8741_exit);
 640
 641 MODULE_DESCRIPTION("ASoC WM8741 driver");
 642 MODULE_AUTHOR("Ian Lartey <ian@opensource.wolfsonmicro.com>");
 643 MODULE_LICENSE("GPL");