wm8994-core.c revision 9db4249fa0fb808ea0c27dfe0fcedc1884ebfb5a
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/pm_runtime.h> 23#include <linux/regmap.h> 24#include <linux/regulator/consumer.h> 25#include <linux/regulator/machine.h> 26 27#include <linux/mfd/wm8994/core.h> 28#include <linux/mfd/wm8994/pdata.h> 29#include <linux/mfd/wm8994/registers.h> 30 31#include "wm8994.h" 32 33/** 34 * wm8994_reg_read: Read a single WM8994 register. 35 * 36 * @wm8994: Device to read from. 37 * @reg: Register to read. 38 */ 39int wm8994_reg_read(struct wm8994 *wm8994, unsigned short reg) 40{ 41 unsigned int val; 42 int ret; 43 44 ret = regmap_read(wm8994->regmap, reg, &val); 45 46 if (ret < 0) 47 return ret; 48 else 49 return val; 50} 51EXPORT_SYMBOL_GPL(wm8994_reg_read); 52 53/** 54 * wm8994_bulk_read: Read multiple WM8994 registers 55 * 56 * @wm8994: Device to read from 57 * @reg: First register 58 * @count: Number of registers 59 * @buf: Buffer to fill. The data will be returned big endian. 60 */ 61int wm8994_bulk_read(struct wm8994 *wm8994, unsigned short reg, 62 int count, u16 *buf) 63{ 64 return regmap_bulk_read(wm8994->regmap, reg, buf, count); 65} 66 67/** 68 * wm8994_reg_write: Write a single WM8994 register. 69 * 70 * @wm8994: Device to write to. 71 * @reg: Register to write to. 72 * @val: Value to write. 73 */ 74int wm8994_reg_write(struct wm8994 *wm8994, unsigned short reg, 75 unsigned short val) 76{ 77 return regmap_write(wm8994->regmap, reg, val); 78} 79EXPORT_SYMBOL_GPL(wm8994_reg_write); 80 81/** 82 * wm8994_bulk_write: Write multiple WM8994 registers 83 * 84 * @wm8994: Device to write to 85 * @reg: First register 86 * @count: Number of registers 87 * @buf: Buffer to write from. Data must be big-endian formatted. 88 */ 89int wm8994_bulk_write(struct wm8994 *wm8994, unsigned short reg, 90 int count, const u16 *buf) 91{ 92 return regmap_raw_write(wm8994->regmap, reg, buf, count * sizeof(u16)); 93} 94EXPORT_SYMBOL_GPL(wm8994_bulk_write); 95 96/** 97 * wm8994_set_bits: Set the value of a bitfield in a WM8994 register 98 * 99 * @wm8994: Device to write to. 100 * @reg: Register to write to. 101 * @mask: Mask of bits to set. 102 * @val: Value to set (unshifted) 103 */ 104int wm8994_set_bits(struct wm8994 *wm8994, unsigned short reg, 105 unsigned short mask, unsigned short val) 106{ 107 return regmap_update_bits(wm8994->regmap, reg, mask, val); 108} 109EXPORT_SYMBOL_GPL(wm8994_set_bits); 110 111static struct mfd_cell wm8994_regulator_devs[] = { 112 { 113 .name = "wm8994-ldo", 114 .id = 1, 115 .pm_runtime_no_callbacks = true, 116 }, 117 { 118 .name = "wm8994-ldo", 119 .id = 2, 120 .pm_runtime_no_callbacks = true, 121 }, 122}; 123 124static struct resource wm8994_codec_resources[] = { 125 { 126 .start = WM8994_IRQ_TEMP_SHUT, 127 .end = WM8994_IRQ_TEMP_WARN, 128 .flags = IORESOURCE_IRQ, 129 }, 130}; 131 132static struct resource wm8994_gpio_resources[] = { 133 { 134 .start = WM8994_IRQ_GPIO(1), 135 .end = WM8994_IRQ_GPIO(11), 136 .flags = IORESOURCE_IRQ, 137 }, 138}; 139 140static struct mfd_cell wm8994_devs[] = { 141 { 142 .name = "wm8994-codec", 143 .num_resources = ARRAY_SIZE(wm8994_codec_resources), 144 .resources = wm8994_codec_resources, 145 }, 146 147 { 148 .name = "wm8994-gpio", 149 .num_resources = ARRAY_SIZE(wm8994_gpio_resources), 150 .resources = wm8994_gpio_resources, 151 .pm_runtime_no_callbacks = true, 152 }, 153}; 154 155/* 156 * Supplies for the main bulk of CODEC; the LDO supplies are ignored 157 * and should be handled via the standard regulator API supply 158 * management. 159 */ 160static const char *wm1811_main_supplies[] = { 161 "DBVDD1", 162 "DBVDD2", 163 "DBVDD3", 164 "DCVDD", 165 "AVDD1", 166 "AVDD2", 167 "CPVDD", 168 "SPKVDD1", 169 "SPKVDD2", 170}; 171 172static const char *wm8994_main_supplies[] = { 173 "DBVDD", 174 "DCVDD", 175 "AVDD1", 176 "AVDD2", 177 "CPVDD", 178 "SPKVDD1", 179 "SPKVDD2", 180}; 181 182static const char *wm8958_main_supplies[] = { 183 "DBVDD1", 184 "DBVDD2", 185 "DBVDD3", 186 "DCVDD", 187 "AVDD1", 188 "AVDD2", 189 "CPVDD", 190 "SPKVDD1", 191 "SPKVDD2", 192}; 193 194#ifdef CONFIG_PM 195static int wm8994_suspend(struct device *dev) 196{ 197 struct wm8994 *wm8994 = dev_get_drvdata(dev); 198 int ret; 199 200 /* Don't actually go through with the suspend if the CODEC is 201 * still active (eg, for audio passthrough from CP. */ 202 ret = wm8994_reg_read(wm8994, WM8994_POWER_MANAGEMENT_1); 203 if (ret < 0) { 204 dev_err(dev, "Failed to read power status: %d\n", ret); 205 } else if (ret & WM8994_VMID_SEL_MASK) { 206 dev_dbg(dev, "CODEC still active, ignoring suspend\n"); 207 return 0; 208 } 209 210 ret = wm8994_reg_read(wm8994, WM8994_POWER_MANAGEMENT_4); 211 if (ret < 0) { 212 dev_err(dev, "Failed to read power status: %d\n", ret); 213 } else if (ret & (WM8994_AIF2ADCL_ENA | WM8994_AIF2ADCR_ENA | 214 WM8994_AIF1ADC2L_ENA | WM8994_AIF1ADC2R_ENA | 215 WM8994_AIF1ADC1L_ENA | WM8994_AIF1ADC1R_ENA)) { 216 dev_dbg(dev, "CODEC still active, ignoring suspend\n"); 217 return 0; 218 } 219 220 ret = wm8994_reg_read(wm8994, WM8994_POWER_MANAGEMENT_5); 221 if (ret < 0) { 222 dev_err(dev, "Failed to read power status: %d\n", ret); 223 } else if (ret & (WM8994_AIF2DACL_ENA | WM8994_AIF2DACR_ENA | 224 WM8994_AIF1DAC2L_ENA | WM8994_AIF1DAC2R_ENA | 225 WM8994_AIF1DAC1L_ENA | WM8994_AIF1DAC1R_ENA)) { 226 dev_dbg(dev, "CODEC still active, ignoring suspend\n"); 227 return 0; 228 } 229 230 switch (wm8994->type) { 231 case WM8958: 232 case WM1811: 233 ret = wm8994_reg_read(wm8994, WM8958_MIC_DETECT_1); 234 if (ret < 0) { 235 dev_err(dev, "Failed to read power status: %d\n", ret); 236 } else if (ret & WM8958_MICD_ENA) { 237 dev_dbg(dev, "CODEC still active, ignoring suspend\n"); 238 return 0; 239 } 240 break; 241 default: 242 break; 243 } 244 245 switch (wm8994->type) { 246 case WM1811: 247 ret = wm8994_reg_read(wm8994, WM8994_ANTIPOP_2); 248 if (ret < 0) { 249 dev_err(dev, "Failed to read jackdet: %d\n", ret); 250 } else if (ret & WM1811_JACKDET_MODE_MASK) { 251 dev_dbg(dev, "CODEC still active, ignoring suspend\n"); 252 return 0; 253 } 254 break; 255 default: 256 break; 257 } 258 259 /* Disable LDO pulldowns while the device is suspended if we 260 * don't know that something will be driving them. */ 261 if (!wm8994->ldo_ena_always_driven) 262 wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2, 263 WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD, 264 WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD); 265 266 /* Explicitly put the device into reset in case regulators 267 * don't get disabled in order to ensure consistent restart. 268 */ 269 wm8994_reg_write(wm8994, WM8994_SOFTWARE_RESET, 270 wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET)); 271 272 regcache_cache_only(wm8994->regmap, true); 273 regcache_mark_dirty(wm8994->regmap); 274 275 wm8994->suspended = true; 276 277 ret = regulator_bulk_disable(wm8994->num_supplies, 278 wm8994->supplies); 279 if (ret != 0) { 280 dev_err(dev, "Failed to disable supplies: %d\n", ret); 281 return ret; 282 } 283 284 return 0; 285} 286 287static int wm8994_resume(struct device *dev) 288{ 289 struct wm8994 *wm8994 = dev_get_drvdata(dev); 290 int ret; 291 292 /* We may have lied to the PM core about suspending */ 293 if (!wm8994->suspended) 294 return 0; 295 296 ret = regulator_bulk_enable(wm8994->num_supplies, 297 wm8994->supplies); 298 if (ret != 0) { 299 dev_err(dev, "Failed to enable supplies: %d\n", ret); 300 return ret; 301 } 302 303 regcache_cache_only(wm8994->regmap, false); 304 ret = regcache_sync(wm8994->regmap); 305 if (ret != 0) { 306 dev_err(dev, "Failed to restore register map: %d\n", ret); 307 goto err_enable; 308 } 309 310 /* Disable LDO pulldowns while the device is active */ 311 wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2, 312 WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD, 313 0); 314 315 wm8994->suspended = false; 316 317 return 0; 318 319err_enable: 320 regulator_bulk_disable(wm8994->num_supplies, wm8994->supplies); 321 322 return ret; 323} 324#endif 325 326#ifdef CONFIG_REGULATOR 327static int wm8994_ldo_in_use(struct wm8994_pdata *pdata, int ldo) 328{ 329 struct wm8994_ldo_pdata *ldo_pdata; 330 331 if (!pdata) 332 return 0; 333 334 ldo_pdata = &pdata->ldo[ldo]; 335 336 if (!ldo_pdata->init_data) 337 return 0; 338 339 return ldo_pdata->init_data->num_consumer_supplies != 0; 340} 341#else 342static int wm8994_ldo_in_use(struct wm8994_pdata *pdata, int ldo) 343{ 344 return 0; 345} 346#endif 347 348static const __devinitdata struct reg_default wm8994_revc_patch[] = { 349 { 0x102, 0x3 }, 350 { 0x56, 0x3 }, 351 { 0x817, 0x0 }, 352 { 0x102, 0x0 }, 353}; 354 355static const __devinitdata struct reg_default wm8958_reva_patch[] = { 356 { 0x102, 0x3 }, 357 { 0xcb, 0x81 }, 358 { 0x817, 0x0 }, 359 { 0x102, 0x0 }, 360}; 361 362static const __devinitdata struct reg_default wm1811_reva_patch[] = { 363 { 0x102, 0x3 }, 364 { 0x5d, 0x7e }, 365 { 0x5e, 0x0 }, 366 { 0x102, 0x0 }, 367}; 368 369/* 370 * Instantiate the generic non-control parts of the device. 371 */ 372static __devinit int wm8994_device_init(struct wm8994 *wm8994, int irq) 373{ 374 struct wm8994_pdata *pdata = wm8994->dev->platform_data; 375 struct regmap_config *regmap_config; 376 const struct reg_default *regmap_patch = NULL; 377 const char *devname; 378 int ret, i, patch_regs; 379 int pulls = 0; 380 381 dev_set_drvdata(wm8994->dev, wm8994); 382 383 /* Add the on-chip regulators first for bootstrapping */ 384 ret = mfd_add_devices(wm8994->dev, -1, 385 wm8994_regulator_devs, 386 ARRAY_SIZE(wm8994_regulator_devs), 387 NULL, 0); 388 if (ret != 0) { 389 dev_err(wm8994->dev, "Failed to add children: %d\n", ret); 390 goto err; 391 } 392 393 switch (wm8994->type) { 394 case WM1811: 395 wm8994->num_supplies = ARRAY_SIZE(wm1811_main_supplies); 396 break; 397 case WM8994: 398 wm8994->num_supplies = ARRAY_SIZE(wm8994_main_supplies); 399 break; 400 case WM8958: 401 wm8994->num_supplies = ARRAY_SIZE(wm8958_main_supplies); 402 break; 403 default: 404 BUG(); 405 goto err; 406 } 407 408 wm8994->supplies = devm_kzalloc(wm8994->dev, 409 sizeof(struct regulator_bulk_data) * 410 wm8994->num_supplies, GFP_KERNEL); 411 if (!wm8994->supplies) { 412 ret = -ENOMEM; 413 goto err; 414 } 415 416 switch (wm8994->type) { 417 case WM1811: 418 for (i = 0; i < ARRAY_SIZE(wm1811_main_supplies); i++) 419 wm8994->supplies[i].supply = wm1811_main_supplies[i]; 420 break; 421 case WM8994: 422 for (i = 0; i < ARRAY_SIZE(wm8994_main_supplies); i++) 423 wm8994->supplies[i].supply = wm8994_main_supplies[i]; 424 break; 425 case WM8958: 426 for (i = 0; i < ARRAY_SIZE(wm8958_main_supplies); i++) 427 wm8994->supplies[i].supply = wm8958_main_supplies[i]; 428 break; 429 default: 430 BUG(); 431 goto err; 432 } 433 434 ret = regulator_bulk_get(wm8994->dev, wm8994->num_supplies, 435 wm8994->supplies); 436 if (ret != 0) { 437 dev_err(wm8994->dev, "Failed to get supplies: %d\n", ret); 438 goto err; 439 } 440 441 ret = regulator_bulk_enable(wm8994->num_supplies, 442 wm8994->supplies); 443 if (ret != 0) { 444 dev_err(wm8994->dev, "Failed to enable supplies: %d\n", ret); 445 goto err_get; 446 } 447 448 ret = wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET); 449 if (ret < 0) { 450 dev_err(wm8994->dev, "Failed to read ID register\n"); 451 goto err_enable; 452 } 453 switch (ret) { 454 case 0x1811: 455 devname = "WM1811"; 456 if (wm8994->type != WM1811) 457 dev_warn(wm8994->dev, "Device registered as type %d\n", 458 wm8994->type); 459 wm8994->type = WM1811; 460 break; 461 case 0x8994: 462 devname = "WM8994"; 463 if (wm8994->type != WM8994) 464 dev_warn(wm8994->dev, "Device registered as type %d\n", 465 wm8994->type); 466 wm8994->type = WM8994; 467 break; 468 case 0x8958: 469 devname = "WM8958"; 470 if (wm8994->type != WM8958) 471 dev_warn(wm8994->dev, "Device registered as type %d\n", 472 wm8994->type); 473 wm8994->type = WM8958; 474 break; 475 default: 476 dev_err(wm8994->dev, "Device is not a WM8994, ID is %x\n", 477 ret); 478 ret = -EINVAL; 479 goto err_enable; 480 } 481 482 ret = wm8994_reg_read(wm8994, WM8994_CHIP_REVISION); 483 if (ret < 0) { 484 dev_err(wm8994->dev, "Failed to read revision register: %d\n", 485 ret); 486 goto err_enable; 487 } 488 wm8994->revision = ret; 489 490 switch (wm8994->type) { 491 case WM8994: 492 switch (wm8994->revision) { 493 case 0: 494 case 1: 495 dev_warn(wm8994->dev, 496 "revision %c not fully supported\n", 497 'A' + wm8994->revision); 498 break; 499 case 2: 500 case 3: 501 regmap_patch = wm8994_revc_patch; 502 patch_regs = ARRAY_SIZE(wm8994_revc_patch); 503 break; 504 default: 505 break; 506 } 507 break; 508 509 case WM8958: 510 switch (wm8994->revision) { 511 case 0: 512 regmap_patch = wm8958_reva_patch; 513 patch_regs = ARRAY_SIZE(wm8958_reva_patch); 514 break; 515 default: 516 break; 517 } 518 break; 519 520 case WM1811: 521 /* Revision C did not change the relevant layer */ 522 if (wm8994->revision > 1) 523 wm8994->revision++; 524 switch (wm8994->revision) { 525 case 0: 526 case 1: 527 regmap_patch = wm1811_reva_patch; 528 patch_regs = ARRAY_SIZE(wm1811_reva_patch); 529 break; 530 default: 531 break; 532 } 533 break; 534 535 default: 536 break; 537 } 538 539 dev_info(wm8994->dev, "%s revision %c\n", devname, 540 'A' + wm8994->revision); 541 542 switch (wm8994->type) { 543 case WM1811: 544 regmap_config = &wm1811_regmap_config; 545 break; 546 case WM8994: 547 regmap_config = &wm8994_regmap_config; 548 break; 549 case WM8958: 550 regmap_config = &wm8958_regmap_config; 551 break; 552 default: 553 dev_err(wm8994->dev, "Unknown device type %d\n", wm8994->type); 554 return -EINVAL; 555 } 556 557 ret = regmap_reinit_cache(wm8994->regmap, regmap_config); 558 if (ret != 0) { 559 dev_err(wm8994->dev, "Failed to reinit register cache: %d\n", 560 ret); 561 return ret; 562 } 563 564 if (regmap_patch) { 565 ret = regmap_register_patch(wm8994->regmap, regmap_patch, 566 patch_regs); 567 if (ret != 0) { 568 dev_err(wm8994->dev, "Failed to register patch: %d\n", 569 ret); 570 goto err; 571 } 572 } 573 574 if (pdata) { 575 wm8994->irq_base = pdata->irq_base; 576 wm8994->gpio_base = pdata->gpio_base; 577 578 /* GPIO configuration is only applied if it's non-zero */ 579 for (i = 0; i < ARRAY_SIZE(pdata->gpio_defaults); i++) { 580 if (pdata->gpio_defaults[i]) { 581 wm8994_set_bits(wm8994, WM8994_GPIO_1 + i, 582 0xffff, 583 pdata->gpio_defaults[i]); 584 } 585 } 586 587 wm8994->ldo_ena_always_driven = pdata->ldo_ena_always_driven; 588 589 if (pdata->spkmode_pu) 590 pulls |= WM8994_SPKMODE_PU; 591 } 592 593 /* Disable unneeded pulls */ 594 wm8994_set_bits(wm8994, WM8994_PULL_CONTROL_2, 595 WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD | 596 WM8994_SPKMODE_PU | WM8994_CSNADDR_PD, 597 pulls); 598 599 /* In some system designs where the regulators are not in use, 600 * we can achieve a small reduction in leakage currents by 601 * floating LDO outputs. This bit makes no difference if the 602 * LDOs are enabled, it only affects cases where the LDOs were 603 * in operation and are then disabled. 604 */ 605 for (i = 0; i < WM8994_NUM_LDO_REGS; i++) { 606 if (wm8994_ldo_in_use(pdata, i)) 607 wm8994_set_bits(wm8994, WM8994_LDO_1 + i, 608 WM8994_LDO1_DISCH, WM8994_LDO1_DISCH); 609 else 610 wm8994_set_bits(wm8994, WM8994_LDO_1 + i, 611 WM8994_LDO1_DISCH, 0); 612 } 613 614 wm8994_irq_init(wm8994); 615 616 ret = mfd_add_devices(wm8994->dev, -1, 617 wm8994_devs, ARRAY_SIZE(wm8994_devs), 618 NULL, 0); 619 if (ret != 0) { 620 dev_err(wm8994->dev, "Failed to add children: %d\n", ret); 621 goto err_irq; 622 } 623 624 pm_runtime_enable(wm8994->dev); 625 pm_runtime_resume(wm8994->dev); 626 627 return 0; 628 629err_irq: 630 wm8994_irq_exit(wm8994); 631err_enable: 632 regulator_bulk_disable(wm8994->num_supplies, 633 wm8994->supplies); 634err_get: 635 regulator_bulk_free(wm8994->num_supplies, wm8994->supplies); 636err: 637 mfd_remove_devices(wm8994->dev); 638 return ret; 639} 640 641static __devexit void wm8994_device_exit(struct wm8994 *wm8994) 642{ 643 pm_runtime_disable(wm8994->dev); 644 mfd_remove_devices(wm8994->dev); 645 wm8994_irq_exit(wm8994); 646 regulator_bulk_disable(wm8994->num_supplies, 647 wm8994->supplies); 648 regulator_bulk_free(wm8994->num_supplies, wm8994->supplies); 649} 650 651static const struct of_device_id wm8994_of_match[] = { 652 { .compatible = "wlf,wm1811", }, 653 { .compatible = "wlf,wm8994", }, 654 { .compatible = "wlf,wm8958", }, 655 { } 656}; 657MODULE_DEVICE_TABLE(of, wm8994_of_match); 658 659static __devinit int wm8994_i2c_probe(struct i2c_client *i2c, 660 const struct i2c_device_id *id) 661{ 662 struct wm8994 *wm8994; 663 int ret; 664 665 wm8994 = devm_kzalloc(&i2c->dev, sizeof(struct wm8994), GFP_KERNEL); 666 if (wm8994 == NULL) 667 return -ENOMEM; 668 669 i2c_set_clientdata(i2c, wm8994); 670 wm8994->dev = &i2c->dev; 671 wm8994->irq = i2c->irq; 672 wm8994->type = id->driver_data; 673 674 wm8994->regmap = devm_regmap_init_i2c(i2c, &wm8994_base_regmap_config); 675 if (IS_ERR(wm8994->regmap)) { 676 ret = PTR_ERR(wm8994->regmap); 677 dev_err(wm8994->dev, "Failed to allocate register map: %d\n", 678 ret); 679 return ret; 680 } 681 682 return wm8994_device_init(wm8994, i2c->irq); 683} 684 685static __devexit int wm8994_i2c_remove(struct i2c_client *i2c) 686{ 687 struct wm8994 *wm8994 = i2c_get_clientdata(i2c); 688 689 wm8994_device_exit(wm8994); 690 691 return 0; 692} 693 694static const struct i2c_device_id wm8994_i2c_id[] = { 695 { "wm1811", WM1811 }, 696 { "wm1811a", WM1811 }, 697 { "wm8994", WM8994 }, 698 { "wm8958", WM8958 }, 699 { } 700}; 701MODULE_DEVICE_TABLE(i2c, wm8994_i2c_id); 702 703static UNIVERSAL_DEV_PM_OPS(wm8994_pm_ops, wm8994_suspend, wm8994_resume, 704 NULL); 705 706static struct i2c_driver wm8994_i2c_driver = { 707 .driver = { 708 .name = "wm8994", 709 .owner = THIS_MODULE, 710 .pm = &wm8994_pm_ops, 711 .of_match_table = wm8994_of_match, 712 }, 713 .probe = wm8994_i2c_probe, 714 .remove = __devexit_p(wm8994_i2c_remove), 715 .id_table = wm8994_i2c_id, 716}; 717 718static int __init wm8994_i2c_init(void) 719{ 720 int ret; 721 722 ret = i2c_add_driver(&wm8994_i2c_driver); 723 if (ret != 0) 724 pr_err("Failed to register wm8994 I2C driver: %d\n", ret); 725 726 return ret; 727} 728module_init(wm8994_i2c_init); 729 730static void __exit wm8994_i2c_exit(void) 731{ 732 i2c_del_driver(&wm8994_i2c_driver); 733} 734module_exit(wm8994_i2c_exit); 735 736MODULE_DESCRIPTION("Core support for the WM8994 audio CODEC"); 737MODULE_LICENSE("GPL"); 738MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); 739