1/* 2 * wm8523.c -- WM8523 ALSA SoC Audio driver 3 * 4 * Copyright 2009 Wolfson Microelectronics plc 5 * 6 * Author: Mark Brown <broonie@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/platform_device.h> 21#include <linux/regulator/consumer.h> 22#include <linux/slab.h> 23#include <sound/core.h> 24#include <sound/pcm.h> 25#include <sound/pcm_params.h> 26#include <sound/soc.h> 27#include <sound/soc-dapm.h> 28#include <sound/initval.h> 29#include <sound/tlv.h> 30 31#include "wm8523.h" 32 33static struct snd_soc_codec *wm8523_codec; 34struct snd_soc_codec_device soc_codec_dev_wm8523; 35 36#define WM8523_NUM_SUPPLIES 2 37static const char *wm8523_supply_names[WM8523_NUM_SUPPLIES] = { 38 "AVDD", 39 "LINEVDD", 40}; 41 42#define WM8523_NUM_RATES 7 43 44/* codec private data */ 45struct wm8523_priv { 46 struct snd_soc_codec codec; 47 u16 reg_cache[WM8523_REGISTER_COUNT]; 48 struct regulator_bulk_data supplies[WM8523_NUM_SUPPLIES]; 49 unsigned int sysclk; 50 unsigned int rate_constraint_list[WM8523_NUM_RATES]; 51 struct snd_pcm_hw_constraint_list rate_constraint; 52}; 53 54static const u16 wm8523_reg[WM8523_REGISTER_COUNT] = { 55 0x8523, /* R0 - DEVICE_ID */ 56 0x0001, /* R1 - REVISION */ 57 0x0000, /* R2 - PSCTRL1 */ 58 0x1812, /* R3 - AIF_CTRL1 */ 59 0x0000, /* R4 - AIF_CTRL2 */ 60 0x0001, /* R5 - DAC_CTRL3 */ 61 0x0190, /* R6 - DAC_GAINL */ 62 0x0190, /* R7 - DAC_GAINR */ 63 0x0000, /* R8 - ZERO_DETECT */ 64}; 65 66static int wm8523_volatile_register(unsigned int reg) 67{ 68 switch (reg) { 69 case WM8523_DEVICE_ID: 70 case WM8523_REVISION: 71 return 1; 72 default: 73 return 0; 74 } 75} 76 77static int wm8523_reset(struct snd_soc_codec *codec) 78{ 79 return snd_soc_write(codec, WM8523_DEVICE_ID, 0); 80} 81 82static const DECLARE_TLV_DB_SCALE(dac_tlv, -10000, 25, 0); 83 84static const char *wm8523_zd_count_text[] = { 85 "1024", 86 "2048", 87}; 88 89static const struct soc_enum wm8523_zc_count = 90 SOC_ENUM_SINGLE(WM8523_ZERO_DETECT, 0, 2, wm8523_zd_count_text); 91 92static const struct snd_kcontrol_new wm8523_snd_controls[] = { 93SOC_DOUBLE_R_TLV("Playback Volume", WM8523_DAC_GAINL, WM8523_DAC_GAINR, 94 0, 448, 0, dac_tlv), 95SOC_SINGLE("ZC Switch", WM8523_DAC_CTRL3, 4, 1, 0), 96SOC_SINGLE("Playback Deemphasis Switch", WM8523_AIF_CTRL1, 8, 1, 0), 97SOC_DOUBLE("Playback Switch", WM8523_DAC_CTRL3, 2, 3, 1, 1), 98SOC_SINGLE("Volume Ramp Up Switch", WM8523_DAC_CTRL3, 1, 1, 0), 99SOC_SINGLE("Volume Ramp Down Switch", WM8523_DAC_CTRL3, 0, 1, 0), 100SOC_ENUM("Zero Detect Count", wm8523_zc_count), 101}; 102 103static const struct snd_soc_dapm_widget wm8523_dapm_widgets[] = { 104SND_SOC_DAPM_DAC("DAC", "Playback", SND_SOC_NOPM, 0, 0), 105SND_SOC_DAPM_OUTPUT("LINEVOUTL"), 106SND_SOC_DAPM_OUTPUT("LINEVOUTR"), 107}; 108 109static const struct snd_soc_dapm_route intercon[] = { 110 { "LINEVOUTL", NULL, "DAC" }, 111 { "LINEVOUTR", NULL, "DAC" }, 112}; 113 114static int wm8523_add_widgets(struct snd_soc_codec *codec) 115{ 116 snd_soc_dapm_new_controls(codec, wm8523_dapm_widgets, 117 ARRAY_SIZE(wm8523_dapm_widgets)); 118 119 snd_soc_dapm_add_routes(codec, intercon, ARRAY_SIZE(intercon)); 120 121 return 0; 122} 123 124static struct { 125 int value; 126 int ratio; 127} lrclk_ratios[WM8523_NUM_RATES] = { 128 { 1, 128 }, 129 { 2, 192 }, 130 { 3, 256 }, 131 { 4, 384 }, 132 { 5, 512 }, 133 { 6, 768 }, 134 { 7, 1152 }, 135}; 136 137static int wm8523_startup(struct snd_pcm_substream *substream, 138 struct snd_soc_dai *dai) 139{ 140 struct snd_soc_codec *codec = dai->codec; 141 struct wm8523_priv *wm8523 = snd_soc_codec_get_drvdata(codec); 142 143 /* The set of sample rates that can be supported depends on the 144 * MCLK supplied to the CODEC - enforce this. 145 */ 146 if (!wm8523->sysclk) { 147 dev_err(codec->dev, 148 "No MCLK configured, call set_sysclk() on init\n"); 149 return -EINVAL; 150 } 151 152 return 0; 153 snd_pcm_hw_constraint_list(substream->runtime, 0, 154 SNDRV_PCM_HW_PARAM_RATE, 155 &wm8523->rate_constraint); 156 157 return 0; 158} 159 160static int wm8523_hw_params(struct snd_pcm_substream *substream, 161 struct snd_pcm_hw_params *params, 162 struct snd_soc_dai *dai) 163{ 164 struct snd_soc_pcm_runtime *rtd = substream->private_data; 165 struct snd_soc_device *socdev = rtd->socdev; 166 struct snd_soc_codec *codec = socdev->card->codec; 167 struct wm8523_priv *wm8523 = snd_soc_codec_get_drvdata(codec); 168 int i; 169 u16 aifctrl1 = snd_soc_read(codec, WM8523_AIF_CTRL1); 170 u16 aifctrl2 = snd_soc_read(codec, WM8523_AIF_CTRL2); 171 172 /* Find a supported LRCLK ratio */ 173 for (i = 0; i < ARRAY_SIZE(lrclk_ratios); i++) { 174 if (wm8523->sysclk / params_rate(params) == 175 lrclk_ratios[i].ratio) 176 break; 177 } 178 179 /* Should never happen, should be handled by constraints */ 180 if (i == ARRAY_SIZE(lrclk_ratios)) { 181 dev_err(codec->dev, "MCLK/fs ratio %d unsupported\n", 182 wm8523->sysclk / params_rate(params)); 183 return -EINVAL; 184 } 185 186 aifctrl2 &= ~WM8523_SR_MASK; 187 aifctrl2 |= lrclk_ratios[i].value; 188 189 aifctrl1 &= ~WM8523_WL_MASK; 190 switch (params_format(params)) { 191 case SNDRV_PCM_FORMAT_S16_LE: 192 break; 193 case SNDRV_PCM_FORMAT_S20_3LE: 194 aifctrl1 |= 0x8; 195 break; 196 case SNDRV_PCM_FORMAT_S24_LE: 197 aifctrl1 |= 0x10; 198 break; 199 case SNDRV_PCM_FORMAT_S32_LE: 200 aifctrl1 |= 0x18; 201 break; 202 } 203 204 snd_soc_write(codec, WM8523_AIF_CTRL1, aifctrl1); 205 snd_soc_write(codec, WM8523_AIF_CTRL2, aifctrl2); 206 207 return 0; 208} 209 210static int wm8523_set_dai_sysclk(struct snd_soc_dai *codec_dai, 211 int clk_id, unsigned int freq, int dir) 212{ 213 struct snd_soc_codec *codec = codec_dai->codec; 214 struct wm8523_priv *wm8523 = snd_soc_codec_get_drvdata(codec); 215 unsigned int val; 216 int i; 217 218 wm8523->sysclk = freq; 219 220 wm8523->rate_constraint.count = 0; 221 for (i = 0; i < ARRAY_SIZE(lrclk_ratios); i++) { 222 val = freq / lrclk_ratios[i].ratio; 223 /* Check that it's a standard rate since core can't 224 * cope with others and having the odd rates confuses 225 * constraint matching. 226 */ 227 switch (val) { 228 case 8000: 229 case 11025: 230 case 16000: 231 case 22050: 232 case 32000: 233 case 44100: 234 case 48000: 235 case 64000: 236 case 88200: 237 case 96000: 238 case 176400: 239 case 192000: 240 dev_dbg(codec->dev, "Supported sample rate: %dHz\n", 241 val); 242 wm8523->rate_constraint_list[i] = val; 243 wm8523->rate_constraint.count++; 244 break; 245 default: 246 dev_dbg(codec->dev, "Skipping sample rate: %dHz\n", 247 val); 248 } 249 } 250 251 /* Need at least one supported rate... */ 252 if (wm8523->rate_constraint.count == 0) 253 return -EINVAL; 254 255 return 0; 256} 257 258 259static int wm8523_set_dai_fmt(struct snd_soc_dai *codec_dai, 260 unsigned int fmt) 261{ 262 struct snd_soc_codec *codec = codec_dai->codec; 263 u16 aifctrl1 = snd_soc_read(codec, WM8523_AIF_CTRL1); 264 265 aifctrl1 &= ~(WM8523_BCLK_INV_MASK | WM8523_LRCLK_INV_MASK | 266 WM8523_FMT_MASK | WM8523_AIF_MSTR_MASK); 267 268 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) { 269 case SND_SOC_DAIFMT_CBM_CFM: 270 aifctrl1 |= WM8523_AIF_MSTR; 271 break; 272 case SND_SOC_DAIFMT_CBS_CFS: 273 break; 274 default: 275 return -EINVAL; 276 } 277 278 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) { 279 case SND_SOC_DAIFMT_I2S: 280 aifctrl1 |= 0x0002; 281 break; 282 case SND_SOC_DAIFMT_RIGHT_J: 283 break; 284 case SND_SOC_DAIFMT_LEFT_J: 285 aifctrl1 |= 0x0001; 286 break; 287 case SND_SOC_DAIFMT_DSP_A: 288 aifctrl1 |= 0x0003; 289 break; 290 case SND_SOC_DAIFMT_DSP_B: 291 aifctrl1 |= 0x0023; 292 break; 293 default: 294 return -EINVAL; 295 } 296 297 switch (fmt & SND_SOC_DAIFMT_INV_MASK) { 298 case SND_SOC_DAIFMT_NB_NF: 299 break; 300 case SND_SOC_DAIFMT_IB_IF: 301 aifctrl1 |= WM8523_BCLK_INV | WM8523_LRCLK_INV; 302 break; 303 case SND_SOC_DAIFMT_IB_NF: 304 aifctrl1 |= WM8523_BCLK_INV; 305 break; 306 case SND_SOC_DAIFMT_NB_IF: 307 aifctrl1 |= WM8523_LRCLK_INV; 308 break; 309 default: 310 return -EINVAL; 311 } 312 313 snd_soc_write(codec, WM8523_AIF_CTRL1, aifctrl1); 314 315 return 0; 316} 317 318static int wm8523_set_bias_level(struct snd_soc_codec *codec, 319 enum snd_soc_bias_level level) 320{ 321 struct wm8523_priv *wm8523 = snd_soc_codec_get_drvdata(codec); 322 int ret, i; 323 324 switch (level) { 325 case SND_SOC_BIAS_ON: 326 break; 327 328 case SND_SOC_BIAS_PREPARE: 329 /* Full power on */ 330 snd_soc_update_bits(codec, WM8523_PSCTRL1, 331 WM8523_SYS_ENA_MASK, 3); 332 break; 333 334 case SND_SOC_BIAS_STANDBY: 335 if (codec->bias_level == SND_SOC_BIAS_OFF) { 336 ret = regulator_bulk_enable(ARRAY_SIZE(wm8523->supplies), 337 wm8523->supplies); 338 if (ret != 0) { 339 dev_err(codec->dev, 340 "Failed to enable supplies: %d\n", 341 ret); 342 return ret; 343 } 344 345 /* Initial power up */ 346 snd_soc_update_bits(codec, WM8523_PSCTRL1, 347 WM8523_SYS_ENA_MASK, 1); 348 349 /* Sync back default/cached values */ 350 for (i = WM8523_AIF_CTRL1; 351 i < WM8523_MAX_REGISTER; i++) 352 snd_soc_write(codec, i, wm8523->reg_cache[i]); 353 354 355 msleep(100); 356 } 357 358 /* Power up to mute */ 359 snd_soc_update_bits(codec, WM8523_PSCTRL1, 360 WM8523_SYS_ENA_MASK, 2); 361 362 break; 363 364 case SND_SOC_BIAS_OFF: 365 /* The chip runs through the power down sequence for us. */ 366 snd_soc_update_bits(codec, WM8523_PSCTRL1, 367 WM8523_SYS_ENA_MASK, 0); 368 msleep(100); 369 370 regulator_bulk_disable(ARRAY_SIZE(wm8523->supplies), 371 wm8523->supplies); 372 break; 373 } 374 codec->bias_level = level; 375 return 0; 376} 377 378#define WM8523_RATES SNDRV_PCM_RATE_8000_192000 379 380#define WM8523_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\ 381 SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE) 382 383static struct snd_soc_dai_ops wm8523_dai_ops = { 384 .startup = wm8523_startup, 385 .hw_params = wm8523_hw_params, 386 .set_sysclk = wm8523_set_dai_sysclk, 387 .set_fmt = wm8523_set_dai_fmt, 388}; 389 390struct snd_soc_dai wm8523_dai = { 391 .name = "WM8523", 392 .playback = { 393 .stream_name = "Playback", 394 .channels_min = 2, /* Mono modes not yet supported */ 395 .channels_max = 2, 396 .rates = WM8523_RATES, 397 .formats = WM8523_FORMATS, 398 }, 399 .ops = &wm8523_dai_ops, 400}; 401EXPORT_SYMBOL_GPL(wm8523_dai); 402 403#ifdef CONFIG_PM 404static int wm8523_suspend(struct platform_device *pdev, pm_message_t state) 405{ 406 struct snd_soc_device *socdev = platform_get_drvdata(pdev); 407 struct snd_soc_codec *codec = socdev->card->codec; 408 409 wm8523_set_bias_level(codec, SND_SOC_BIAS_OFF); 410 return 0; 411} 412 413static int wm8523_resume(struct platform_device *pdev) 414{ 415 struct snd_soc_device *socdev = platform_get_drvdata(pdev); 416 struct snd_soc_codec *codec = socdev->card->codec; 417 418 wm8523_set_bias_level(codec, SND_SOC_BIAS_STANDBY); 419 420 return 0; 421} 422#else 423#define wm8523_suspend NULL 424#define wm8523_resume NULL 425#endif 426 427static int wm8523_probe(struct platform_device *pdev) 428{ 429 struct snd_soc_device *socdev = platform_get_drvdata(pdev); 430 struct snd_soc_codec *codec; 431 int ret = 0; 432 433 if (wm8523_codec == NULL) { 434 dev_err(&pdev->dev, "Codec device not registered\n"); 435 return -ENODEV; 436 } 437 438 socdev->card->codec = wm8523_codec; 439 codec = wm8523_codec; 440 441 /* register pcms */ 442 ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1); 443 if (ret < 0) { 444 dev_err(codec->dev, "failed to create pcms: %d\n", ret); 445 goto pcm_err; 446 } 447 448 snd_soc_add_controls(codec, wm8523_snd_controls, 449 ARRAY_SIZE(wm8523_snd_controls)); 450 wm8523_add_widgets(codec); 451 452 return ret; 453 454pcm_err: 455 return ret; 456} 457 458static int wm8523_remove(struct platform_device *pdev) 459{ 460 struct snd_soc_device *socdev = platform_get_drvdata(pdev); 461 462 snd_soc_free_pcms(socdev); 463 snd_soc_dapm_free(socdev); 464 465 return 0; 466} 467 468struct snd_soc_codec_device soc_codec_dev_wm8523 = { 469 .probe = wm8523_probe, 470 .remove = wm8523_remove, 471 .suspend = wm8523_suspend, 472 .resume = wm8523_resume, 473}; 474EXPORT_SYMBOL_GPL(soc_codec_dev_wm8523); 475 476static int wm8523_register(struct wm8523_priv *wm8523, 477 enum snd_soc_control_type control) 478{ 479 int ret; 480 struct snd_soc_codec *codec = &wm8523->codec; 481 int i; 482 483 if (wm8523_codec) { 484 dev_err(codec->dev, "Another WM8523 is registered\n"); 485 ret = -EINVAL; 486 goto err; 487 } 488 489 mutex_init(&codec->mutex); 490 INIT_LIST_HEAD(&codec->dapm_widgets); 491 INIT_LIST_HEAD(&codec->dapm_paths); 492 493 snd_soc_codec_set_drvdata(codec, wm8523); 494 codec->name = "WM8523"; 495 codec->owner = THIS_MODULE; 496 codec->bias_level = SND_SOC_BIAS_OFF; 497 codec->set_bias_level = wm8523_set_bias_level; 498 codec->dai = &wm8523_dai; 499 codec->num_dai = 1; 500 codec->reg_cache_size = WM8523_REGISTER_COUNT; 501 codec->reg_cache = &wm8523->reg_cache; 502 codec->volatile_register = wm8523_volatile_register; 503 504 wm8523->rate_constraint.list = &wm8523->rate_constraint_list[0]; 505 wm8523->rate_constraint.count = 506 ARRAY_SIZE(wm8523->rate_constraint_list); 507 508 memcpy(codec->reg_cache, wm8523_reg, sizeof(wm8523_reg)); 509 510 ret = snd_soc_codec_set_cache_io(codec, 8, 16, control); 511 if (ret != 0) { 512 dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret); 513 goto err; 514 } 515 516 for (i = 0; i < ARRAY_SIZE(wm8523->supplies); i++) 517 wm8523->supplies[i].supply = wm8523_supply_names[i]; 518 519 ret = regulator_bulk_get(codec->dev, ARRAY_SIZE(wm8523->supplies), 520 wm8523->supplies); 521 if (ret != 0) { 522 dev_err(codec->dev, "Failed to request supplies: %d\n", ret); 523 goto err; 524 } 525 526 ret = regulator_bulk_enable(ARRAY_SIZE(wm8523->supplies), 527 wm8523->supplies); 528 if (ret != 0) { 529 dev_err(codec->dev, "Failed to enable supplies: %d\n", ret); 530 goto err_get; 531 } 532 533 ret = snd_soc_read(codec, WM8523_DEVICE_ID); 534 if (ret < 0) { 535 dev_err(codec->dev, "Failed to read ID register\n"); 536 goto err_enable; 537 } 538 if (ret != wm8523_reg[WM8523_DEVICE_ID]) { 539 dev_err(codec->dev, "Device is not a WM8523, ID is %x\n", ret); 540 ret = -EINVAL; 541 goto err_enable; 542 } 543 544 ret = snd_soc_read(codec, WM8523_REVISION); 545 if (ret < 0) { 546 dev_err(codec->dev, "Failed to read revision register\n"); 547 goto err_enable; 548 } 549 dev_info(codec->dev, "revision %c\n", 550 (ret & WM8523_CHIP_REV_MASK) + 'A'); 551 552 ret = wm8523_reset(codec); 553 if (ret < 0) { 554 dev_err(codec->dev, "Failed to issue reset\n"); 555 goto err_enable; 556 } 557 558 wm8523_dai.dev = codec->dev; 559 560 /* Change some default settings - latch VU and enable ZC */ 561 wm8523->reg_cache[WM8523_DAC_GAINR] |= WM8523_DACR_VU; 562 wm8523->reg_cache[WM8523_DAC_CTRL3] |= WM8523_ZC; 563 564 wm8523_set_bias_level(codec, SND_SOC_BIAS_STANDBY); 565 566 /* Bias level configuration will have done an extra enable */ 567 regulator_bulk_disable(ARRAY_SIZE(wm8523->supplies), wm8523->supplies); 568 569 wm8523_codec = codec; 570 571 ret = snd_soc_register_codec(codec); 572 if (ret != 0) { 573 dev_err(codec->dev, "Failed to register codec: %d\n", ret); 574 goto err_enable; 575 } 576 577 ret = snd_soc_register_dai(&wm8523_dai); 578 if (ret != 0) { 579 dev_err(codec->dev, "Failed to register DAI: %d\n", ret); 580 goto err_codec; 581 } 582 583 return 0; 584 585err_codec: 586 snd_soc_unregister_codec(codec); 587err_enable: 588 regulator_bulk_disable(ARRAY_SIZE(wm8523->supplies), wm8523->supplies); 589err_get: 590 regulator_bulk_free(ARRAY_SIZE(wm8523->supplies), wm8523->supplies); 591err: 592 kfree(wm8523); 593 return ret; 594} 595 596static void wm8523_unregister(struct wm8523_priv *wm8523) 597{ 598 wm8523_set_bias_level(&wm8523->codec, SND_SOC_BIAS_OFF); 599 regulator_bulk_free(ARRAY_SIZE(wm8523->supplies), wm8523->supplies); 600 snd_soc_unregister_dai(&wm8523_dai); 601 snd_soc_unregister_codec(&wm8523->codec); 602 kfree(wm8523); 603 wm8523_codec = NULL; 604} 605 606#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) 607static __devinit int wm8523_i2c_probe(struct i2c_client *i2c, 608 const struct i2c_device_id *id) 609{ 610 struct wm8523_priv *wm8523; 611 struct snd_soc_codec *codec; 612 613 wm8523 = kzalloc(sizeof(struct wm8523_priv), GFP_KERNEL); 614 if (wm8523 == NULL) 615 return -ENOMEM; 616 617 codec = &wm8523->codec; 618 codec->hw_write = (hw_write_t)i2c_master_send; 619 620 i2c_set_clientdata(i2c, wm8523); 621 codec->control_data = i2c; 622 623 codec->dev = &i2c->dev; 624 625 return wm8523_register(wm8523, SND_SOC_I2C); 626} 627 628static __devexit int wm8523_i2c_remove(struct i2c_client *client) 629{ 630 struct wm8523_priv *wm8523 = i2c_get_clientdata(client); 631 wm8523_unregister(wm8523); 632 return 0; 633} 634 635static const struct i2c_device_id wm8523_i2c_id[] = { 636 { "wm8523", 0 }, 637 { } 638}; 639MODULE_DEVICE_TABLE(i2c, wm8523_i2c_id); 640 641static struct i2c_driver wm8523_i2c_driver = { 642 .driver = { 643 .name = "WM8523", 644 .owner = THIS_MODULE, 645 }, 646 .probe = wm8523_i2c_probe, 647 .remove = __devexit_p(wm8523_i2c_remove), 648 .id_table = wm8523_i2c_id, 649}; 650#endif 651 652static int __init wm8523_modinit(void) 653{ 654 int ret; 655#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) 656 ret = i2c_add_driver(&wm8523_i2c_driver); 657 if (ret != 0) { 658 printk(KERN_ERR "Failed to register WM8523 I2C driver: %d\n", 659 ret); 660 } 661#endif 662 return 0; 663} 664module_init(wm8523_modinit); 665 666static void __exit wm8523_exit(void) 667{ 668#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) 669 i2c_del_driver(&wm8523_i2c_driver); 670#endif 671} 672module_exit(wm8523_exit); 673 674MODULE_DESCRIPTION("ASoC WM8523 driver"); 675MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); 676MODULE_LICENSE("GPL"); 677