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 <sound/core.h> 23 #include <sound/pcm.h> 24 #include <sound/pcm_params.h> 25 #include <sound/soc.h> 26 #include <sound/soc-dapm.h> 27 #include <sound/initval.h> 28 #include <sound/tlv.h> 29 30 #include "wm8523.h" 31 32 static struct snd_soc_codec *wm8523_codec; 33 struct snd_soc_codec_device soc_codec_dev_wm8523; 34 35 #define WM8523_NUM_SUPPLIES 2 36 static const char *wm8523_supply_names[WM8523_NUM_SUPPLIES] = { 37 "AVDD", 38 "LINEVDD", 39 }; 40 41 #define WM8523_NUM_RATES 7 42 43 /* codec private data */ 44 struct wm8523_priv { 45 struct snd_soc_codec codec; 46 u16 reg_cache[WM8523_REGISTER_COUNT]; 47 struct regulator_bulk_data supplies[WM8523_NUM_SUPPLIES]; 48 unsigned int sysclk; 49 unsigned int rate_constraint_list[WM8523_NUM_RATES]; 50 struct snd_pcm_hw_constraint_list rate_constraint; 51 }; 52 53 static const u16 wm8523_reg[WM8523_REGISTER_COUNT] = { 54 0x8523, /* R0 - DEVICE_ID */ 55 0x0001, /* R1 - REVISION */ 56 0x0000, /* R2 - PSCTRL1 */ 57 0x1812, /* R3 - AIF_CTRL1 */ 58 0x0000, /* R4 - AIF_CTRL2 */ 59 0x0001, /* R5 - DAC_CTRL3 */ 60 0x0190, /* R6 - DAC_GAINL */ 61 0x0190, /* R7 - DAC_GAINR */ 62 0x0000, /* R8 - ZERO_DETECT */ 63 }; 64 65 static int wm8523_volatile_register(unsigned int reg) 66 { 67 switch (reg) { 68 case WM8523_DEVICE_ID: 69 case WM8523_REVISION: 70 return 1; 71 default: 72 return 0; 73 } 74 } 75 76 static int wm8523_reset(struct snd_soc_codec *codec) 77 { 78 return snd_soc_write(codec, WM8523_DEVICE_ID, 0); 79 } 80 81 static const DECLARE_TLV_DB_SCALE(dac_tlv, -10000, 25, 0); 82 83 static const char *wm8523_zd_count_text[] = { 84 "1024", 85 "2048", 86 }; 87 88 static const struct soc_enum wm8523_zc_count = 89 SOC_ENUM_SINGLE(WM8523_ZERO_DETECT, 0, 2, wm8523_zd_count_text); 90 91 static const struct snd_kcontrol_new wm8523_snd_controls[] = { 92 SOC_DOUBLE_R_TLV("Playback Volume", WM8523_DAC_GAINL, WM8523_DAC_GAINR, 93 0, 448, 0, dac_tlv), 94 SOC_SINGLE("ZC Switch", WM8523_DAC_CTRL3, 4, 1, 0), 95 SOC_SINGLE("Playback Deemphasis Switch", WM8523_AIF_CTRL1, 8, 1, 0), 96 SOC_DOUBLE("Playback Switch", WM8523_DAC_CTRL3, 2, 3, 1, 1), 97 SOC_SINGLE("Volume Ramp Up Switch", WM8523_DAC_CTRL3, 1, 1, 0), 98 SOC_SINGLE("Volume Ramp Down Switch", WM8523_DAC_CTRL3, 0, 1, 0), 99 SOC_ENUM("Zero Detect Count", wm8523_zc_count), 100 }; 101 102 static const struct snd_soc_dapm_widget wm8523_dapm_widgets[] = { 103 SND_SOC_DAPM_DAC("DAC", "Playback", SND_SOC_NOPM, 0, 0), 104 SND_SOC_DAPM_OUTPUT("LINEVOUTL"), 105 SND_SOC_DAPM_OUTPUT("LINEVOUTR"), 106 }; 107 108 static const struct snd_soc_dapm_route intercon[] = { 109 { "LINEVOUTL", NULL, "DAC" }, 110 { "LINEVOUTR", NULL, "DAC" }, 111 }; 112 113 static int wm8523_add_widgets(struct snd_soc_codec *codec) 114 { 115 snd_soc_dapm_new_controls(codec, wm8523_dapm_widgets, 116 ARRAY_SIZE(wm8523_dapm_widgets)); 117 118 snd_soc_dapm_add_routes(codec, intercon, ARRAY_SIZE(intercon)); 119 120 snd_soc_dapm_new_widgets(codec); 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 = codec->private_data; 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 = codec->private_data; 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 = codec->private_data; 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 = codec->private_data; 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 ret = snd_soc_init_card(socdev); 452 if (ret < 0) { 453 dev_err(codec->dev, "failed to register card: %d\n", ret); 454 goto card_err; 455 } 456 457 return ret; 458 459 card_err: 460 snd_soc_free_pcms(socdev); 461 snd_soc_dapm_free(socdev); 462 pcm_err: 463 return ret; 464 } 465 466 static int wm8523_remove(struct platform_device *pdev) 467 { 468 struct snd_soc_device *socdev = platform_get_drvdata(pdev); 469 470 snd_soc_free_pcms(socdev); 471 snd_soc_dapm_free(socdev); 472 473 return 0; 474 } 475 476 struct snd_soc_codec_device soc_codec_dev_wm8523 = { 477 .probe = wm8523_probe, 478 .remove = wm8523_remove, 479 .suspend = wm8523_suspend, 480 .resume = wm8523_resume, 481 }; 482 EXPORT_SYMBOL_GPL(soc_codec_dev_wm8523); 483 484 static int wm8523_register(struct wm8523_priv *wm8523, 485 enum snd_soc_control_type control) 486 { 487 int ret; 488 struct snd_soc_codec *codec = &wm8523->codec; 489 int i; 490 491 if (wm8523_codec) { 492 dev_err(codec->dev, "Another WM8523 is registered\n"); 493 return -EINVAL; 494 } 495 496 mutex_init(&codec->mutex); 497 INIT_LIST_HEAD(&codec->dapm_widgets); 498 INIT_LIST_HEAD(&codec->dapm_paths); 499 500 codec->private_data = wm8523; 501 codec->name = "WM8523"; 502 codec->owner = THIS_MODULE; 503 codec->bias_level = SND_SOC_BIAS_OFF; 504 codec->set_bias_level = wm8523_set_bias_level; 505 codec->dai = &wm8523_dai; 506 codec->num_dai = 1; 507 codec->reg_cache_size = WM8523_REGISTER_COUNT; 508 codec->reg_cache = &wm8523->reg_cache; 509 codec->volatile_register = wm8523_volatile_register; 510 511 wm8523->rate_constraint.list = &wm8523->rate_constraint_list[0]; 512 wm8523->rate_constraint.count = 513 ARRAY_SIZE(wm8523->rate_constraint_list); 514 515 memcpy(codec->reg_cache, wm8523_reg, sizeof(wm8523_reg)); 516 517 ret = snd_soc_codec_set_cache_io(codec, 8, 16, control); 518 if (ret != 0) { 519 dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret); 520 goto err; 521 } 522 523 for (i = 0; i < ARRAY_SIZE(wm8523->supplies); i++) 524 wm8523->supplies[i].supply = wm8523_supply_names[i]; 525 526 ret = regulator_bulk_get(codec->dev, ARRAY_SIZE(wm8523->supplies), 527 wm8523->supplies); 528 if (ret != 0) { 529 dev_err(codec->dev, "Failed to request supplies: %d\n", ret); 530 goto err; 531 } 532 533 ret = regulator_bulk_enable(ARRAY_SIZE(wm8523->supplies), 534 wm8523->supplies); 535 if (ret != 0) { 536 dev_err(codec->dev, "Failed to enable supplies: %d\n", ret); 537 goto err_get; 538 } 539 540 ret = snd_soc_read(codec, WM8523_DEVICE_ID); 541 if (ret < 0) { 542 dev_err(codec->dev, "Failed to read ID register\n"); 543 goto err_enable; 544 } 545 if (ret != wm8523_reg[WM8523_DEVICE_ID]) { 546 dev_err(codec->dev, "Device is not a WM8523, ID is %x\n", ret); 547 ret = -EINVAL; 548 goto err_enable; 549 } 550 551 ret = snd_soc_read(codec, WM8523_REVISION); 552 if (ret < 0) { 553 dev_err(codec->dev, "Failed to read revision register\n"); 554 goto err_enable; 555 } 556 dev_info(codec->dev, "revision %c\n", 557 (ret & WM8523_CHIP_REV_MASK) + 'A'); 558 559 ret = wm8523_reset(codec); 560 if (ret < 0) { 561 dev_err(codec->dev, "Failed to issue reset\n"); 562 goto err_enable; 563 } 564 565 wm8523_dai.dev = codec->dev; 566 567 /* Change some default settings - latch VU and enable ZC */ 568 wm8523->reg_cache[WM8523_DAC_GAINR] |= WM8523_DACR_VU; 569 wm8523->reg_cache[WM8523_DAC_CTRL3] |= WM8523_ZC; 570 571 wm8523_set_bias_level(codec, SND_SOC_BIAS_STANDBY); 572 573 /* Bias level configuration will have done an extra enable */ 574 regulator_bulk_disable(ARRAY_SIZE(wm8523->supplies), wm8523->supplies); 575 576 wm8523_codec = codec; 577 578 ret = snd_soc_register_codec(codec); 579 if (ret != 0) { 580 dev_err(codec->dev, "Failed to register codec: %d\n", ret); 581 return ret; 582 } 583 584 ret = snd_soc_register_dai(&wm8523_dai); 585 if (ret != 0) { 586 dev_err(codec->dev, "Failed to register DAI: %d\n", ret); 587 snd_soc_unregister_codec(codec); 588 return ret; 589 } 590 591 return 0; 592 593 err_enable: 594 regulator_bulk_disable(ARRAY_SIZE(wm8523->supplies), wm8523->supplies); 595 err_get: 596 regulator_bulk_free(ARRAY_SIZE(wm8523->supplies), wm8523->supplies); 597 err: 598 kfree(wm8523); 599 return ret; 600 } 601 602 static void wm8523_unregister(struct wm8523_priv *wm8523) 603 { 604 wm8523_set_bias_level(&wm8523->codec, SND_SOC_BIAS_OFF); 605 regulator_bulk_free(ARRAY_SIZE(wm8523->supplies), wm8523->supplies); 606 snd_soc_unregister_dai(&wm8523_dai); 607 snd_soc_unregister_codec(&wm8523->codec); 608 kfree(wm8523); 609 wm8523_codec = NULL; 610 } 611 612 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) 613 static __devinit int wm8523_i2c_probe(struct i2c_client *i2c, 614 const struct i2c_device_id *id) 615 { 616 struct wm8523_priv *wm8523; 617 struct snd_soc_codec *codec; 618 619 wm8523 = kzalloc(sizeof(struct wm8523_priv), GFP_KERNEL); 620 if (wm8523 == NULL) 621 return -ENOMEM; 622 623 codec = &wm8523->codec; 624 codec->hw_write = (hw_write_t)i2c_master_send; 625 626 i2c_set_clientdata(i2c, wm8523); 627 codec->control_data = i2c; 628 629 codec->dev = &i2c->dev; 630 631 return wm8523_register(wm8523, SND_SOC_I2C); 632 } 633 634 static __devexit int wm8523_i2c_remove(struct i2c_client *client) 635 { 636 struct wm8523_priv *wm8523 = i2c_get_clientdata(client); 637 wm8523_unregister(wm8523); 638 return 0; 639 } 640 641 #ifdef CONFIG_PM 642 static int wm8523_i2c_suspend(struct i2c_client *i2c, pm_message_t msg) 643 { 644 return snd_soc_suspend_device(&i2c->dev); 645 } 646 647 static int wm8523_i2c_resume(struct i2c_client *i2c) 648 { 649 return snd_soc_resume_device(&i2c->dev); 650 } 651 #else 652 #define wm8523_i2c_suspend NULL 653 #define wm8523_i2c_resume NULL 654 #endif 655 656 static const struct i2c_device_id wm8523_i2c_id[] = { 657 { "wm8523", 0 }, 658 { } 659 }; 660 MODULE_DEVICE_TABLE(i2c, wm8523_i2c_id); 661 662 static struct i2c_driver wm8523_i2c_driver = { 663 .driver = { 664 .name = "WM8523", 665 .owner = THIS_MODULE, 666 }, 667 .probe = wm8523_i2c_probe, 668 .remove = __devexit_p(wm8523_i2c_remove), 669 .suspend = wm8523_i2c_suspend, 670 .resume = wm8523_i2c_resume, 671 .id_table = wm8523_i2c_id, 672 }; 673 #endif 674 675 static int __init wm8523_modinit(void) 676 { 677 int ret; 678 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) 679 ret = i2c_add_driver(&wm8523_i2c_driver); 680 if (ret != 0) { 681 printk(KERN_ERR "Failed to register WM8523 I2C driver: %d\n", 682 ret); 683 } 684 #endif 685 return 0; 686 } 687 module_init(wm8523_modinit); 688 689 static void __exit wm8523_exit(void) 690 { 691 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) 692 i2c_del_driver(&wm8523_i2c_driver); 693 #endif 694 } 695 module_exit(wm8523_exit); 696 697 MODULE_DESCRIPTION("ASoC WM8523 driver"); 698 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); 699 MODULE_LICENSE("GPL"); 700