1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * Routines for control of the AK4117 via 4-wire serial interface 4 * IEC958 (S/PDIF) receiver by Asahi Kasei 5 * Copyright (c) by Jaroslav Kysela <perex@perex.cz> 6 */ 7 8#include <linux/slab.h> 9#include <linux/delay.h> 10#include <linux/module.h> 11#include <sound/core.h> 12#include <sound/control.h> 13#include <sound/pcm.h> 14#include <sound/ak4117.h> 15#include <sound/asoundef.h> 16 17MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>"); 18MODULE_DESCRIPTION("AK4117 IEC958 (S/PDIF) receiver by Asahi Kasei"); 19MODULE_LICENSE("GPL"); 20 21#define AK4117_ADDR 0x00 /* fixed address */ 22 23static void snd_ak4117_timer(struct timer_list *t); 24 25static void reg_write(struct ak4117 *ak4117, unsigned char reg, unsigned char val) 26{ 27 ak4117->write(ak4117->private_data, reg, val); 28 if (reg < sizeof(ak4117->regmap)) 29 ak4117->regmap[reg] = val; 30} 31 32static inline unsigned char reg_read(struct ak4117 *ak4117, unsigned char reg) 33{ 34 return ak4117->read(ak4117->private_data, reg); 35} 36 37#if 0 38static void reg_dump(struct ak4117 *ak4117) 39{ 40 int i; 41 42 printk(KERN_DEBUG "AK4117 REG DUMP:\n"); 43 for (i = 0; i < 0x1b; i++) 44 printk(KERN_DEBUG "reg[%02x] = %02x (%02x)\n", i, reg_read(ak4117, i), i < sizeof(ak4117->regmap) ? ak4117->regmap[i] : 0); 45} 46#endif 47 48static void snd_ak4117_free(struct ak4117 *chip) 49{ 50 del_timer_sync(&chip->timer); 51 kfree(chip); 52} 53 54static int snd_ak4117_dev_free(struct snd_device *device) 55{ 56 struct ak4117 *chip = device->device_data; 57 snd_ak4117_free(chip); 58 return 0; 59} 60 61int snd_ak4117_create(struct snd_card *card, ak4117_read_t *read, ak4117_write_t *write, 62 const unsigned char pgm[5], void *private_data, struct ak4117 **r_ak4117) 63{ 64 struct ak4117 *chip; 65 int err = 0; 66 unsigned char reg; 67 static const struct snd_device_ops ops = { 68 .dev_free = snd_ak4117_dev_free, 69 }; 70 71 chip = kzalloc(sizeof(*chip), GFP_KERNEL); 72 if (chip == NULL) 73 return -ENOMEM; 74 spin_lock_init(&chip->lock); 75 chip->card = card; 76 chip->read = read; 77 chip->write = write; 78 chip->private_data = private_data; 79 timer_setup(&chip->timer, snd_ak4117_timer, 0); 80 81 for (reg = 0; reg < 5; reg++) 82 chip->regmap[reg] = pgm[reg]; 83 snd_ak4117_reinit(chip); 84 85 chip->rcs0 = reg_read(chip, AK4117_REG_RCS0) & ~(AK4117_QINT | AK4117_CINT | AK4117_STC); 86 chip->rcs1 = reg_read(chip, AK4117_REG_RCS1); 87 chip->rcs2 = reg_read(chip, AK4117_REG_RCS2); 88 89 if ((err = snd_device_new(card, SNDRV_DEV_CODEC, chip, &ops)) < 0) 90 goto __fail; 91 92 if (r_ak4117) 93 *r_ak4117 = chip; 94 return 0; 95 96 __fail: 97 snd_ak4117_free(chip); 98 return err; 99} 100 101void snd_ak4117_reg_write(struct ak4117 *chip, unsigned char reg, unsigned char mask, unsigned char val) 102{ 103 if (reg >= 5) 104 return; 105 reg_write(chip, reg, (chip->regmap[reg] & ~mask) | val); 106} 107 108void snd_ak4117_reinit(struct ak4117 *chip) 109{ 110 unsigned char old = chip->regmap[AK4117_REG_PWRDN], reg; 111 112 del_timer(&chip->timer); 113 chip->init = 1; 114 /* bring the chip to reset state and powerdown state */ 115 reg_write(chip, AK4117_REG_PWRDN, 0); 116 udelay(200); 117 /* release reset, but leave powerdown */ 118 reg_write(chip, AK4117_REG_PWRDN, (old | AK4117_RST) & ~AK4117_PWN); 119 udelay(200); 120 for (reg = 1; reg < 5; reg++) 121 reg_write(chip, reg, chip->regmap[reg]); 122 /* release powerdown, everything is initialized now */ 123 reg_write(chip, AK4117_REG_PWRDN, old | AK4117_RST | AK4117_PWN); 124 chip->init = 0; 125 mod_timer(&chip->timer, 1 + jiffies); 126} 127 128static unsigned int external_rate(unsigned char rcs1) 129{ 130 switch (rcs1 & (AK4117_FS0|AK4117_FS1|AK4117_FS2|AK4117_FS3)) { 131 case AK4117_FS_32000HZ: return 32000; 132 case AK4117_FS_44100HZ: return 44100; 133 case AK4117_FS_48000HZ: return 48000; 134 case AK4117_FS_88200HZ: return 88200; 135 case AK4117_FS_96000HZ: return 96000; 136 case AK4117_FS_176400HZ: return 176400; 137 case AK4117_FS_192000HZ: return 192000; 138 default: return 0; 139 } 140} 141 142static int snd_ak4117_in_error_info(struct snd_kcontrol *kcontrol, 143 struct snd_ctl_elem_info *uinfo) 144{ 145 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; 146 uinfo->count = 1; 147 uinfo->value.integer.min = 0; 148 uinfo->value.integer.max = LONG_MAX; 149 return 0; 150} 151 152static int snd_ak4117_in_error_get(struct snd_kcontrol *kcontrol, 153 struct snd_ctl_elem_value *ucontrol) 154{ 155 struct ak4117 *chip = snd_kcontrol_chip(kcontrol); 156 157 spin_lock_irq(&chip->lock); 158 ucontrol->value.integer.value[0] = 159 chip->errors[kcontrol->private_value]; 160 chip->errors[kcontrol->private_value] = 0; 161 spin_unlock_irq(&chip->lock); 162 return 0; 163} 164 165#define snd_ak4117_in_bit_info snd_ctl_boolean_mono_info 166 167static int snd_ak4117_in_bit_get(struct snd_kcontrol *kcontrol, 168 struct snd_ctl_elem_value *ucontrol) 169{ 170 struct ak4117 *chip = snd_kcontrol_chip(kcontrol); 171 unsigned char reg = kcontrol->private_value & 0xff; 172 unsigned char bit = (kcontrol->private_value >> 8) & 0xff; 173 unsigned char inv = (kcontrol->private_value >> 31) & 1; 174 175 ucontrol->value.integer.value[0] = ((reg_read(chip, reg) & (1 << bit)) ? 1 : 0) ^ inv; 176 return 0; 177} 178 179static int snd_ak4117_rx_info(struct snd_kcontrol *kcontrol, 180 struct snd_ctl_elem_info *uinfo) 181{ 182 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; 183 uinfo->count = 1; 184 uinfo->value.integer.min = 0; 185 uinfo->value.integer.max = 1; 186 return 0; 187} 188 189static int snd_ak4117_rx_get(struct snd_kcontrol *kcontrol, 190 struct snd_ctl_elem_value *ucontrol) 191{ 192 struct ak4117 *chip = snd_kcontrol_chip(kcontrol); 193 194 ucontrol->value.integer.value[0] = (chip->regmap[AK4117_REG_IO] & AK4117_IPS) ? 1 : 0; 195 return 0; 196} 197 198static int snd_ak4117_rx_put(struct snd_kcontrol *kcontrol, 199 struct snd_ctl_elem_value *ucontrol) 200{ 201 struct ak4117 *chip = snd_kcontrol_chip(kcontrol); 202 int change; 203 u8 old_val; 204 205 spin_lock_irq(&chip->lock); 206 old_val = chip->regmap[AK4117_REG_IO]; 207 change = !!ucontrol->value.integer.value[0] != ((old_val & AK4117_IPS) ? 1 : 0); 208 if (change) 209 reg_write(chip, AK4117_REG_IO, (old_val & ~AK4117_IPS) | (ucontrol->value.integer.value[0] ? AK4117_IPS : 0)); 210 spin_unlock_irq(&chip->lock); 211 return change; 212} 213 214static int snd_ak4117_rate_info(struct snd_kcontrol *kcontrol, 215 struct snd_ctl_elem_info *uinfo) 216{ 217 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; 218 uinfo->count = 1; 219 uinfo->value.integer.min = 0; 220 uinfo->value.integer.max = 192000; 221 return 0; 222} 223 224static int snd_ak4117_rate_get(struct snd_kcontrol *kcontrol, 225 struct snd_ctl_elem_value *ucontrol) 226{ 227 struct ak4117 *chip = snd_kcontrol_chip(kcontrol); 228 229 ucontrol->value.integer.value[0] = external_rate(reg_read(chip, AK4117_REG_RCS1)); 230 return 0; 231} 232 233static int snd_ak4117_spdif_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo) 234{ 235 uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958; 236 uinfo->count = 1; 237 return 0; 238} 239 240static int snd_ak4117_spdif_get(struct snd_kcontrol *kcontrol, 241 struct snd_ctl_elem_value *ucontrol) 242{ 243 struct ak4117 *chip = snd_kcontrol_chip(kcontrol); 244 unsigned i; 245 246 for (i = 0; i < AK4117_REG_RXCSB_SIZE; i++) 247 ucontrol->value.iec958.status[i] = reg_read(chip, AK4117_REG_RXCSB0 + i); 248 return 0; 249} 250 251static int snd_ak4117_spdif_mask_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo) 252{ 253 uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958; 254 uinfo->count = 1; 255 return 0; 256} 257 258static int snd_ak4117_spdif_mask_get(struct snd_kcontrol *kcontrol, 259 struct snd_ctl_elem_value *ucontrol) 260{ 261 memset(ucontrol->value.iec958.status, 0xff, AK4117_REG_RXCSB_SIZE); 262 return 0; 263} 264 265static int snd_ak4117_spdif_pinfo(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo) 266{ 267 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; 268 uinfo->value.integer.min = 0; 269 uinfo->value.integer.max = 0xffff; 270 uinfo->count = 4; 271 return 0; 272} 273 274static int snd_ak4117_spdif_pget(struct snd_kcontrol *kcontrol, 275 struct snd_ctl_elem_value *ucontrol) 276{ 277 struct ak4117 *chip = snd_kcontrol_chip(kcontrol); 278 unsigned short tmp; 279 280 ucontrol->value.integer.value[0] = 0xf8f2; 281 ucontrol->value.integer.value[1] = 0x4e1f; 282 tmp = reg_read(chip, AK4117_REG_Pc0) | (reg_read(chip, AK4117_REG_Pc1) << 8); 283 ucontrol->value.integer.value[2] = tmp; 284 tmp = reg_read(chip, AK4117_REG_Pd0) | (reg_read(chip, AK4117_REG_Pd1) << 8); 285 ucontrol->value.integer.value[3] = tmp; 286 return 0; 287} 288 289static int snd_ak4117_spdif_qinfo(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo) 290{ 291 uinfo->type = SNDRV_CTL_ELEM_TYPE_BYTES; 292 uinfo->count = AK4117_REG_QSUB_SIZE; 293 return 0; 294} 295 296static int snd_ak4117_spdif_qget(struct snd_kcontrol *kcontrol, 297 struct snd_ctl_elem_value *ucontrol) 298{ 299 struct ak4117 *chip = snd_kcontrol_chip(kcontrol); 300 unsigned i; 301 302 for (i = 0; i < AK4117_REG_QSUB_SIZE; i++) 303 ucontrol->value.bytes.data[i] = reg_read(chip, AK4117_REG_QSUB_ADDR + i); 304 return 0; 305} 306 307/* Don't forget to change AK4117_CONTROLS define!!! */ 308static const struct snd_kcontrol_new snd_ak4117_iec958_controls[] = { 309{ 310 .iface = SNDRV_CTL_ELEM_IFACE_PCM, 311 .name = "IEC958 Parity Errors", 312 .access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE, 313 .info = snd_ak4117_in_error_info, 314 .get = snd_ak4117_in_error_get, 315 .private_value = AK4117_PARITY_ERRORS, 316}, 317{ 318 .iface = SNDRV_CTL_ELEM_IFACE_PCM, 319 .name = "IEC958 V-Bit Errors", 320 .access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE, 321 .info = snd_ak4117_in_error_info, 322 .get = snd_ak4117_in_error_get, 323 .private_value = AK4117_V_BIT_ERRORS, 324}, 325{ 326 .iface = SNDRV_CTL_ELEM_IFACE_PCM, 327 .name = "IEC958 C-CRC Errors", 328 .access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE, 329 .info = snd_ak4117_in_error_info, 330 .get = snd_ak4117_in_error_get, 331 .private_value = AK4117_CCRC_ERRORS, 332}, 333{ 334 .iface = SNDRV_CTL_ELEM_IFACE_PCM, 335 .name = "IEC958 Q-CRC Errors", 336 .access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE, 337 .info = snd_ak4117_in_error_info, 338 .get = snd_ak4117_in_error_get, 339 .private_value = AK4117_QCRC_ERRORS, 340}, 341{ 342 .iface = SNDRV_CTL_ELEM_IFACE_PCM, 343 .name = "IEC958 External Rate", 344 .access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE, 345 .info = snd_ak4117_rate_info, 346 .get = snd_ak4117_rate_get, 347}, 348{ 349 .iface = SNDRV_CTL_ELEM_IFACE_PCM, 350 .name = SNDRV_CTL_NAME_IEC958("",CAPTURE,MASK), 351 .access = SNDRV_CTL_ELEM_ACCESS_READ, 352 .info = snd_ak4117_spdif_mask_info, 353 .get = snd_ak4117_spdif_mask_get, 354}, 355{ 356 .iface = SNDRV_CTL_ELEM_IFACE_PCM, 357 .name = SNDRV_CTL_NAME_IEC958("",CAPTURE,DEFAULT), 358 .access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE, 359 .info = snd_ak4117_spdif_info, 360 .get = snd_ak4117_spdif_get, 361}, 362{ 363 .iface = SNDRV_CTL_ELEM_IFACE_PCM, 364 .name = "IEC958 Preamble Capture Default", 365 .access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE, 366 .info = snd_ak4117_spdif_pinfo, 367 .get = snd_ak4117_spdif_pget, 368}, 369{ 370 .iface = SNDRV_CTL_ELEM_IFACE_PCM, 371 .name = "IEC958 Q-subcode Capture Default", 372 .access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE, 373 .info = snd_ak4117_spdif_qinfo, 374 .get = snd_ak4117_spdif_qget, 375}, 376{ 377 .iface = SNDRV_CTL_ELEM_IFACE_PCM, 378 .name = "IEC958 Audio", 379 .access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE, 380 .info = snd_ak4117_in_bit_info, 381 .get = snd_ak4117_in_bit_get, 382 .private_value = (1<<31) | (3<<8) | AK4117_REG_RCS0, 383}, 384{ 385 .iface = SNDRV_CTL_ELEM_IFACE_PCM, 386 .name = "IEC958 Non-PCM Bitstream", 387 .access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE, 388 .info = snd_ak4117_in_bit_info, 389 .get = snd_ak4117_in_bit_get, 390 .private_value = (5<<8) | AK4117_REG_RCS1, 391}, 392{ 393 .iface = SNDRV_CTL_ELEM_IFACE_PCM, 394 .name = "IEC958 DTS Bitstream", 395 .access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE, 396 .info = snd_ak4117_in_bit_info, 397 .get = snd_ak4117_in_bit_get, 398 .private_value = (6<<8) | AK4117_REG_RCS1, 399}, 400{ 401 .iface = SNDRV_CTL_ELEM_IFACE_PCM, 402 .name = "AK4117 Input Select", 403 .access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_WRITE, 404 .info = snd_ak4117_rx_info, 405 .get = snd_ak4117_rx_get, 406 .put = snd_ak4117_rx_put, 407} 408}; 409 410int snd_ak4117_build(struct ak4117 *ak4117, struct snd_pcm_substream *cap_substream) 411{ 412 struct snd_kcontrol *kctl; 413 unsigned int idx; 414 int err; 415 416 if (snd_BUG_ON(!cap_substream)) 417 return -EINVAL; 418 ak4117->substream = cap_substream; 419 for (idx = 0; idx < AK4117_CONTROLS; idx++) { 420 kctl = snd_ctl_new1(&snd_ak4117_iec958_controls[idx], ak4117); 421 if (kctl == NULL) 422 return -ENOMEM; 423 kctl->id.device = cap_substream->pcm->device; 424 kctl->id.subdevice = cap_substream->number; 425 err = snd_ctl_add(ak4117->card, kctl); 426 if (err < 0) 427 return err; 428 ak4117->kctls[idx] = kctl; 429 } 430 return 0; 431} 432 433int snd_ak4117_external_rate(struct ak4117 *ak4117) 434{ 435 unsigned char rcs1; 436 437 rcs1 = reg_read(ak4117, AK4117_REG_RCS1); 438 return external_rate(rcs1); 439} 440 441int snd_ak4117_check_rate_and_errors(struct ak4117 *ak4117, unsigned int flags) 442{ 443 struct snd_pcm_runtime *runtime = ak4117->substream ? ak4117->substream->runtime : NULL; 444 unsigned long _flags; 445 int res = 0; 446 unsigned char rcs0, rcs1, rcs2; 447 unsigned char c0, c1; 448 449 rcs1 = reg_read(ak4117, AK4117_REG_RCS1); 450 if (flags & AK4117_CHECK_NO_STAT) 451 goto __rate; 452 rcs0 = reg_read(ak4117, AK4117_REG_RCS0); 453 rcs2 = reg_read(ak4117, AK4117_REG_RCS2); 454 // printk(KERN_DEBUG "AK IRQ: rcs0 = 0x%x, rcs1 = 0x%x, rcs2 = 0x%x\n", rcs0, rcs1, rcs2); 455 spin_lock_irqsave(&ak4117->lock, _flags); 456 if (rcs0 & AK4117_PAR) 457 ak4117->errors[AK4117_PARITY_ERRORS]++; 458 if (rcs0 & AK4117_V) 459 ak4117->errors[AK4117_V_BIT_ERRORS]++; 460 if (rcs2 & AK4117_CCRC) 461 ak4117->errors[AK4117_CCRC_ERRORS]++; 462 if (rcs2 & AK4117_QCRC) 463 ak4117->errors[AK4117_QCRC_ERRORS]++; 464 c0 = (ak4117->rcs0 & (AK4117_QINT | AK4117_CINT | AK4117_STC | AK4117_AUDION | AK4117_AUTO | AK4117_UNLCK)) ^ 465 (rcs0 & (AK4117_QINT | AK4117_CINT | AK4117_STC | AK4117_AUDION | AK4117_AUTO | AK4117_UNLCK)); 466 c1 = (ak4117->rcs1 & (AK4117_DTSCD | AK4117_NPCM | AK4117_PEM | 0x0f)) ^ 467 (rcs1 & (AK4117_DTSCD | AK4117_NPCM | AK4117_PEM | 0x0f)); 468 ak4117->rcs0 = rcs0 & ~(AK4117_QINT | AK4117_CINT | AK4117_STC); 469 ak4117->rcs1 = rcs1; 470 ak4117->rcs2 = rcs2; 471 spin_unlock_irqrestore(&ak4117->lock, _flags); 472 473 if (rcs0 & AK4117_PAR) 474 snd_ctl_notify(ak4117->card, SNDRV_CTL_EVENT_MASK_VALUE, &ak4117->kctls[0]->id); 475 if (rcs0 & AK4117_V) 476 snd_ctl_notify(ak4117->card, SNDRV_CTL_EVENT_MASK_VALUE, &ak4117->kctls[1]->id); 477 if (rcs2 & AK4117_CCRC) 478 snd_ctl_notify(ak4117->card, SNDRV_CTL_EVENT_MASK_VALUE, &ak4117->kctls[2]->id); 479 if (rcs2 & AK4117_QCRC) 480 snd_ctl_notify(ak4117->card, SNDRV_CTL_EVENT_MASK_VALUE, &ak4117->kctls[3]->id); 481 482 /* rate change */ 483 if (c1 & 0x0f) 484 snd_ctl_notify(ak4117->card, SNDRV_CTL_EVENT_MASK_VALUE, &ak4117->kctls[4]->id); 485 486 if ((c1 & AK4117_PEM) | (c0 & AK4117_CINT)) 487 snd_ctl_notify(ak4117->card, SNDRV_CTL_EVENT_MASK_VALUE, &ak4117->kctls[6]->id); 488 if (c0 & AK4117_QINT) 489 snd_ctl_notify(ak4117->card, SNDRV_CTL_EVENT_MASK_VALUE, &ak4117->kctls[8]->id); 490 491 if (c0 & AK4117_AUDION) 492 snd_ctl_notify(ak4117->card, SNDRV_CTL_EVENT_MASK_VALUE, &ak4117->kctls[9]->id); 493 if (c1 & AK4117_NPCM) 494 snd_ctl_notify(ak4117->card, SNDRV_CTL_EVENT_MASK_VALUE, &ak4117->kctls[10]->id); 495 if (c1 & AK4117_DTSCD) 496 snd_ctl_notify(ak4117->card, SNDRV_CTL_EVENT_MASK_VALUE, &ak4117->kctls[11]->id); 497 498 if (ak4117->change_callback && (c0 | c1) != 0) 499 ak4117->change_callback(ak4117, c0, c1); 500 501 __rate: 502 /* compare rate */ 503 res = external_rate(rcs1); 504 if (!(flags & AK4117_CHECK_NO_RATE) && runtime && runtime->rate != res) { 505 snd_pcm_stream_lock_irqsave(ak4117->substream, _flags); 506 if (snd_pcm_running(ak4117->substream)) { 507 // printk(KERN_DEBUG "rate changed (%i <- %i)\n", runtime->rate, res); 508 snd_pcm_stop(ak4117->substream, SNDRV_PCM_STATE_DRAINING); 509 wake_up(&runtime->sleep); 510 res = 1; 511 } 512 snd_pcm_stream_unlock_irqrestore(ak4117->substream, _flags); 513 } 514 return res; 515} 516 517static void snd_ak4117_timer(struct timer_list *t) 518{ 519 struct ak4117 *chip = from_timer(chip, t, timer); 520 521 if (chip->init) 522 return; 523 snd_ak4117_check_rate_and_errors(chip, 0); 524 mod_timer(&chip->timer, 1 + jiffies); 525} 526 527EXPORT_SYMBOL(snd_ak4117_create); 528EXPORT_SYMBOL(snd_ak4117_reg_write); 529EXPORT_SYMBOL(snd_ak4117_reinit); 530EXPORT_SYMBOL(snd_ak4117_build); 531EXPORT_SYMBOL(snd_ak4117_external_rate); 532EXPORT_SYMBOL(snd_ak4117_check_rate_and_errors); 533