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 33 static struct snd_soc_codec *wm8523_codec; 34 struct snd_soc_codec_device soc_codec_dev_wm8523; 35 36 #define WM8523_NUM_SUPPLIES 2 37 static 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 */ 45 struct 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 54 static 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 66 static 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 77 static int wm8523_reset(struct snd_soc_codec *codec) 78 { 79 return snd_soc_write(codec, WM8523_DEVICE_ID, 0); 80 } 81 82 static const DECLARE_TLV_DB_SCALE(dac_tlv, -10000, 25, 0); 83 84 static const char *wm8523_zd_count_text[] = { 85 "1024", 86 "2048", 87 }; 88 89 static const struct soc_enum wm8523_zc_count = 90 SOC_ENUM_SINGLE(WM8523_ZERO_DETECT, 0, 2, wm8523_zd_count_text); 91 92 static const struct snd_kcontrol_new wm8523_snd_controls[] = { 93 SOC_DOUBLE_R_TLV("Playback Volume", WM8523_DAC_GAINL, WM8523_DAC_GAINR, 94 0, 448, 0, dac_tlv), 95 SOC_SINGLE("ZC Switch", WM8523_DAC_CTRL3, 4, 1, 0), 96 SOC_SINGLE("Playback Deemphasis Switch", WM8523_AIF_CTRL1, 8, 1, 0), 97 SOC_DOUBLE("Playback Switch", WM8523_DAC_CTRL3, 2, 3, 1, 1), 98 SOC_SINGLE("Volume Ramp Up Switch", WM8523_DAC_CTRL3, 1, 1, 0), 99 SOC_SINGLE("Volume Ramp Down Switch", WM8523_DAC_CTRL3, 0, 1, 0), 100 SOC_ENUM("Zero Detect Count", wm8523_zc_count), 101 }; 102 103 static const struct snd_soc_dapm_widget wm8523_dapm_widgets[] = { 104 SND_SOC_DAPM_DAC("DAC", "Playback", SND_SOC_NOPM, 0, 0), 105 SND_SOC_DAPM_OUTPUT("LINEVOUTL"), 106 SND_SOC_DAPM_OUTPUT("LINEVOUTR"), 107 }; 108 109 static const struct snd_soc_dapm_route intercon[] = { 110 { "LINEVOUTL", NULL, "DAC" }, 111 { "LINEVOUTR", NULL, "DAC" }, 112 }; 113 114 static 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 } 123 124 static 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 }; 136 137 static 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 } 159 160 static 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 } 209 210 static 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 } 257 258 259 static 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 } 317 318 static 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) 382 383 static 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 }; 389 390 struct 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 }; 401 EXPORT_SYMBOL_GPL(wm8523_dai); 402 403 #ifdef CONFIG_PM 404 static 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 } 412 413 static 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 426 427 static 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; 453 454 pcm_err: 455 return ret; 456 } 457 458 static 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 } 467 468 struct 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 }; 474 EXPORT_SYMBOL_GPL(soc_codec_dev_wm8523); 475 476 static 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 return -EINVAL; 486 } 487 488 mutex_init(&codec->mutex); 489 INIT_LIST_HEAD(&codec->dapm_widgets); 490 INIT_LIST_HEAD(&codec->dapm_paths); 491 492 snd_soc_codec_set_drvdata(codec, wm8523); 493 codec->name = "WM8523"; 494 codec->owner = THIS_MODULE; 495 codec->bias_level = SND_SOC_BIAS_OFF; 496 codec->set_bias_level = wm8523_set_bias_level; 497 codec->dai = &wm8523_dai; 498 codec->num_dai = 1; 499 codec->reg_cache_size = WM8523_REGISTER_COUNT; 500 codec->reg_cache = &wm8523->reg_cache; 501 codec->volatile_register = wm8523_volatile_register; 502 503 wm8523->rate_constraint.list = &wm8523->rate_constraint_list[0]; 504 wm8523->rate_constraint.count = 505 ARRAY_SIZE(wm8523->rate_constraint_list); 506 507 memcpy(codec->reg_cache, wm8523_reg, sizeof(wm8523_reg)); 508 509 ret = snd_soc_codec_set_cache_io(codec, 8, 16, control); 510 if (ret != 0) { 511 dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret); 512 goto err; 513 } 514 515 for (i = 0; i < ARRAY_SIZE(wm8523->supplies); i++) 516 wm8523->supplies[i].supply = wm8523_supply_names[i]; 517 518 ret = regulator_bulk_get(codec->dev, ARRAY_SIZE(wm8523->supplies), 519 wm8523->supplies); 520 if (ret != 0) { 521 dev_err(codec->dev, "Failed to request supplies: %d\n", ret); 522 goto err; 523 } 524 525 ret = regulator_bulk_enable(ARRAY_SIZE(wm8523->supplies), 526 wm8523->supplies); 527 if (ret != 0) { 528 dev_err(codec->dev, "Failed to enable supplies: %d\n", ret); 529 goto err_get; 530 } 531 532 ret = snd_soc_read(codec, WM8523_DEVICE_ID); 533 if (ret < 0) { 534 dev_err(codec->dev, "Failed to read ID register\n"); 535 goto err_enable; 536 } 537 if (ret != wm8523_reg[WM8523_DEVICE_ID]) { 538 dev_err(codec->dev, "Device is not a WM8523, ID is %x\n", ret); 539 ret = -EINVAL; 540 goto err_enable; 541 } 542 543 ret = snd_soc_read(codec, WM8523_REVISION); 544 if (ret < 0) { 545 dev_err(codec->dev, "Failed to read revision register\n"); 546 goto err_enable; 547 } 548 dev_info(codec->dev, "revision %c\n", 549 (ret & WM8523_CHIP_REV_MASK) + 'A'); 550 551 ret = wm8523_reset(codec); 552 if (ret < 0) { 553 dev_err(codec->dev, "Failed to issue reset\n"); 554 goto err_enable; 555 } 556 557 wm8523_dai.dev = codec->dev; 558 559 /* Change some default settings - latch VU and enable ZC */ 560 wm8523->reg_cache[WM8523_DAC_GAINR] |= WM8523_DACR_VU; 561 wm8523->reg_cache[WM8523_DAC_CTRL3] |= WM8523_ZC; 562 563 wm8523_set_bias_level(codec, SND_SOC_BIAS_STANDBY); 564 565 /* Bias level configuration will have done an extra enable */ 566 regulator_bulk_disable(ARRAY_SIZE(wm8523->supplies), wm8523->supplies); 567 568 wm8523_codec = codec; 569 570 ret = snd_soc_register_codec(codec); 571 if (ret != 0) { 572 dev_err(codec->dev, "Failed to register codec: %d\n", ret); 573 return ret; 574 } 575 576 ret = snd_soc_register_dai(&wm8523_dai); 577 if (ret != 0) { 578 dev_err(codec->dev, "Failed to register DAI: %d\n", ret); 579 snd_soc_unregister_codec(codec); 580 return ret; 581 } 582 583 return 0; 584 585 err_enable: 586 regulator_bulk_disable(ARRAY_SIZE(wm8523->supplies), wm8523->supplies); 587 err_get: 588 regulator_bulk_free(ARRAY_SIZE(wm8523->supplies), wm8523->supplies); 589 err: 590 kfree(wm8523); 591 return ret; 592 } 593 594 static void wm8523_unregister(struct wm8523_priv *wm8523) 595 { 596 wm8523_set_bias_level(&wm8523->codec, SND_SOC_BIAS_OFF); 597 regulator_bulk_free(ARRAY_SIZE(wm8523->supplies), wm8523->supplies); 598 snd_soc_unregister_dai(&wm8523_dai); 599 snd_soc_unregister_codec(&wm8523->codec); 600 kfree(wm8523); 601 wm8523_codec = NULL; 602 } 603 604 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) 605 static __devinit int wm8523_i2c_probe(struct i2c_client *i2c, 606 const struct i2c_device_id *id) 607 { 608 struct wm8523_priv *wm8523; 609 struct snd_soc_codec *codec; 610 611 wm8523 = kzalloc(sizeof(struct wm8523_priv), GFP_KERNEL); 612 if (wm8523 == NULL) 613 return -ENOMEM; 614 615 codec = &wm8523->codec; 616 codec->hw_write = (hw_write_t)i2c_master_send; 617 618 i2c_set_clientdata(i2c, wm8523); 619 codec->control_data = i2c; 620 621 codec->dev = &i2c->dev; 622 623 return wm8523_register(wm8523, SND_SOC_I2C); 624 } 625 626 static __devexit int wm8523_i2c_remove(struct i2c_client *client) 627 { 628 struct wm8523_priv *wm8523 = i2c_get_clientdata(client); 629 wm8523_unregister(wm8523); 630 return 0; 631 } 632 633 static const struct i2c_device_id wm8523_i2c_id[] = { 634 { "wm8523", 0 }, 635 { } 636 }; 637 MODULE_DEVICE_TABLE(i2c, wm8523_i2c_id); 638 639 static struct i2c_driver wm8523_i2c_driver = { 640 .driver = { 641 .name = "WM8523", 642 .owner = THIS_MODULE, 643 }, 644 .probe = wm8523_i2c_probe, 645 .remove = __devexit_p(wm8523_i2c_remove), 646 .id_table = wm8523_i2c_id, 647 }; 648 #endif 649 650 static int __init wm8523_modinit(void) 651 { 652 int ret; 653 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) 654 ret = i2c_add_driver(&wm8523_i2c_driver); 655 if (ret != 0) { 656 printk(KERN_ERR "Failed to register WM8523 I2C driver: %d\n", 657 ret); 658 } 659 #endif 660 return 0; 661 } 662 module_init(wm8523_modinit); 663 664 static void __exit wm8523_exit(void) 665 { 666 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) 667 i2c_del_driver(&wm8523_i2c_driver); 668 #endif 669 } 670 module_exit(wm8523_exit); 671 672 MODULE_DESCRIPTION("ASoC WM8523 driver"); 673 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); 674 MODULE_LICENSE("GPL"); 675