1 /* 2 * Routines for control of the AK4117 via 4-wire serial interface 3 * IEC958 (S/PDIF) receiver by Asahi Kasei 4 * Copyright (c) by Jaroslav Kysela <perex@perex.cz> 5 * 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 20 * 21 */ 22 23 #include <linux/slab.h> 24 #include <linux/delay.h> 25 #include <sound/core.h> 26 #include <sound/control.h> 27 #include <sound/pcm.h> 28 #include <sound/ak4117.h> 29 #include <sound/asoundef.h> 30 31 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>"); 32 MODULE_DESCRIPTION("AK4117 IEC958 (S/PDIF) receiver by Asahi Kasei"); 33 MODULE_LICENSE("GPL"); 34 35 #define AK4117_ADDR 0x00 /* fixed address */ 36 37 static void snd_ak4117_timer(unsigned long data); 38 39 static void reg_write(struct ak4117 *ak4117, unsigned char reg, unsigned char val) 40 { 41 ak4117->write(ak4117->private_data, reg, val); 42 if (reg < sizeof(ak4117->regmap)) 43 ak4117->regmap[reg] = val; 44 } 45 46 static inline unsigned char reg_read(struct ak4117 *ak4117, unsigned char reg) 47 { 48 return ak4117->read(ak4117->private_data, reg); 49 } 50 51 #if 0 52 static void reg_dump(struct ak4117 *ak4117) 53 { 54 int i; 55 56 printk(KERN_DEBUG "AK4117 REG DUMP:\n"); 57 for (i = 0; i < 0x1b; i++) 58 printk(KERN_DEBUG "reg[%02x] = %02x (%02x)\n", i, reg_read(ak4117, i), i < sizeof(ak4117->regmap) ? ak4117->regmap[i] : 0); 59 } 60 #endif 61 62 static void snd_ak4117_free(struct ak4117 *chip) 63 { 64 del_timer(&chip->timer); 65 kfree(chip); 66 } 67 68 static int snd_ak4117_dev_free(struct snd_device *device) 69 { 70 struct ak4117 *chip = device->device_data; 71 snd_ak4117_free(chip); 72 return 0; 73 } 74 75 int snd_ak4117_create(struct snd_card *card, ak4117_read_t *read, ak4117_write_t *write, 76 const unsigned char pgm[5], void *private_data, struct ak4117 **r_ak4117) 77 { 78 struct ak4117 *chip; 79 int err = 0; 80 unsigned char reg; 81 static struct snd_device_ops ops = { 82 .dev_free = snd_ak4117_dev_free, 83 }; 84 85 chip = kzalloc(sizeof(*chip), GFP_KERNEL); 86 if (chip == NULL) 87 return -ENOMEM; 88 spin_lock_init(&chip->lock); 89 chip->card = card; 90 chip->read = read; 91 chip->write = write; 92 chip->private_data = private_data; 93 init_timer(&chip->timer); 94 chip->timer.data = (unsigned long)chip; 95 chip->timer.function = snd_ak4117_timer; 96 97 for (reg = 0; reg < 5; reg++) 98 chip->regmap[reg] = pgm[reg]; 99 snd_ak4117_reinit(chip); 100 101 chip->rcs0 = reg_read(chip, AK4117_REG_RCS0) & ~(AK4117_QINT | AK4117_CINT | AK4117_STC); 102 chip->rcs1 = reg_read(chip, AK4117_REG_RCS1); 103 chip->rcs2 = reg_read(chip, AK4117_REG_RCS2); 104 105 if ((err = snd_device_new(card, SNDRV_DEV_CODEC, chip, &ops)) < 0) 106 goto __fail; 107 108 if (r_ak4117) 109 *r_ak4117 = chip; 110 return 0; 111 112 __fail: 113 snd_ak4117_free(chip); 114 return err < 0 ? err : -EIO; 115 } 116 117 void snd_ak4117_reg_write(struct ak4117 *chip, unsigned char reg, unsigned char mask, unsigned char val) 118 { 119 if (reg >= 5) 120 return; 121 reg_write(chip, reg, (chip->regmap[reg] & ~mask) | val); 122 } 123 124 void snd_ak4117_reinit(struct ak4117 *chip) 125 { 126 unsigned char old = chip->regmap[AK4117_REG_PWRDN], reg; 127 128 del_timer(&chip->timer); 129 chip->init = 1; 130 /* bring the chip to reset state and powerdown state */ 131 reg_write(chip, AK4117_REG_PWRDN, 0); 132 udelay(200); 133 /* release reset, but leave powerdown */ 134 reg_write(chip, AK4117_REG_PWRDN, (old | AK4117_RST) & ~AK4117_PWN); 135 udelay(200); 136 for (reg = 1; reg < 5; reg++) 137 reg_write(chip, reg, chip->regmap[reg]); 138 /* release powerdown, everything is initialized now */ 139 reg_write(chip, AK4117_REG_PWRDN, old | AK4117_RST | AK4117_PWN); 140 chip->init = 0; 141 chip->timer.expires = 1 + jiffies; 142 add_timer(&chip->timer); 143 } 144 145 static unsigned int external_rate(unsigned char rcs1) 146 { 147 switch (rcs1 & (AK4117_FS0|AK4117_FS1|AK4117_FS2|AK4117_FS3)) { 148 case AK4117_FS_32000HZ: return 32000; 149 case AK4117_FS_44100HZ: return 44100; 150 case AK4117_FS_48000HZ: return 48000; 151 case AK4117_FS_88200HZ: return 88200; 152 case AK4117_FS_96000HZ: return 96000; 153 case AK4117_FS_176400HZ: return 176400; 154 case AK4117_FS_192000HZ: return 192000; 155 default: return 0; 156 } 157 } 158 159 static int snd_ak4117_in_error_info(struct snd_kcontrol *kcontrol, 160 struct snd_ctl_elem_info *uinfo) 161 { 162 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; 163 uinfo->count = 1; 164 uinfo->value.integer.min = 0; 165 uinfo->value.integer.max = LONG_MAX; 166 return 0; 167 } 168 169 static int snd_ak4117_in_error_get(struct snd_kcontrol *kcontrol, 170 struct snd_ctl_elem_value *ucontrol) 171 { 172 struct ak4117 *chip = snd_kcontrol_chip(kcontrol); 173 long *ptr; 174 175 spin_lock_irq(&chip->lock); 176 ptr = (long *)(((char *)chip) + kcontrol->private_value); 177 ucontrol->value.integer.value[0] = *ptr; 178 *ptr = 0; 179 spin_unlock_irq(&chip->lock); 180 return 0; 181 } 182 183 #define snd_ak4117_in_bit_info snd_ctl_boolean_mono_info 184 185 static int snd_ak4117_in_bit_get(struct snd_kcontrol *kcontrol, 186 struct snd_ctl_elem_value *ucontrol) 187 { 188 struct ak4117 *chip = snd_kcontrol_chip(kcontrol); 189 unsigned char reg = kcontrol->private_value & 0xff; 190 unsigned char bit = (kcontrol->private_value >> 8) & 0xff; 191 unsigned char inv = (kcontrol->private_value >> 31) & 1; 192 193 ucontrol->value.integer.value[0] = ((reg_read(chip, reg) & (1 << bit)) ? 1 : 0) ^ inv; 194 return 0; 195 } 196 197 static int snd_ak4117_rx_info(struct snd_kcontrol *kcontrol, 198 struct snd_ctl_elem_info *uinfo) 199 { 200 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; 201 uinfo->count = 1; 202 uinfo->value.integer.min = 0; 203 uinfo->value.integer.max = 1; 204 return 0; 205 } 206 207 static int snd_ak4117_rx_get(struct snd_kcontrol *kcontrol, 208 struct snd_ctl_elem_value *ucontrol) 209 { 210 struct ak4117 *chip = snd_kcontrol_chip(kcontrol); 211 212 ucontrol->value.integer.value[0] = (chip->regmap[AK4117_REG_IO] & AK4117_IPS) ? 1 : 0; 213 return 0; 214 } 215 216 static int snd_ak4117_rx_put(struct snd_kcontrol *kcontrol, 217 struct snd_ctl_elem_value *ucontrol) 218 { 219 struct ak4117 *chip = snd_kcontrol_chip(kcontrol); 220 int change; 221 u8 old_val; 222 223 spin_lock_irq(&chip->lock); 224 old_val = chip->regmap[AK4117_REG_IO]; 225 change = !!ucontrol->value.integer.value[0] != ((old_val & AK4117_IPS) ? 1 : 0); 226 if (change) 227 reg_write(chip, AK4117_REG_IO, (old_val & ~AK4117_IPS) | (ucontrol->value.integer.value[0] ? AK4117_IPS : 0)); 228 spin_unlock_irq(&chip->lock); 229 return change; 230 } 231 232 static int snd_ak4117_rate_info(struct snd_kcontrol *kcontrol, 233 struct snd_ctl_elem_info *uinfo) 234 { 235 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; 236 uinfo->count = 1; 237 uinfo->value.integer.min = 0; 238 uinfo->value.integer.max = 192000; 239 return 0; 240 } 241 242 static int snd_ak4117_rate_get(struct snd_kcontrol *kcontrol, 243 struct snd_ctl_elem_value *ucontrol) 244 { 245 struct ak4117 *chip = snd_kcontrol_chip(kcontrol); 246 247 ucontrol->value.integer.value[0] = external_rate(reg_read(chip, AK4117_REG_RCS1)); 248 return 0; 249 } 250 251 static int snd_ak4117_spdif_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 } 257 258 static int snd_ak4117_spdif_get(struct snd_kcontrol *kcontrol, 259 struct snd_ctl_elem_value *ucontrol) 260 { 261 struct ak4117 *chip = snd_kcontrol_chip(kcontrol); 262 unsigned i; 263 264 for (i = 0; i < AK4117_REG_RXCSB_SIZE; i++) 265 ucontrol->value.iec958.status[i] = reg_read(chip, AK4117_REG_RXCSB0 + i); 266 return 0; 267 } 268 269 static int snd_ak4117_spdif_mask_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo) 270 { 271 uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958; 272 uinfo->count = 1; 273 return 0; 274 } 275 276 static int snd_ak4117_spdif_mask_get(struct snd_kcontrol *kcontrol, 277 struct snd_ctl_elem_value *ucontrol) 278 { 279 memset(ucontrol->value.iec958.status, 0xff, AK4117_REG_RXCSB_SIZE); 280 return 0; 281 } 282 283 static int snd_ak4117_spdif_pinfo(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo) 284 { 285 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; 286 uinfo->value.integer.min = 0; 287 uinfo->value.integer.max = 0xffff; 288 uinfo->count = 4; 289 return 0; 290 } 291 292 static int snd_ak4117_spdif_pget(struct snd_kcontrol *kcontrol, 293 struct snd_ctl_elem_value *ucontrol) 294 { 295 struct ak4117 *chip = snd_kcontrol_chip(kcontrol); 296 unsigned short tmp; 297 298 ucontrol->value.integer.value[0] = 0xf8f2; 299 ucontrol->value.integer.value[1] = 0x4e1f; 300 tmp = reg_read(chip, AK4117_REG_Pc0) | (reg_read(chip, AK4117_REG_Pc1) << 8); 301 ucontrol->value.integer.value[2] = tmp; 302 tmp = reg_read(chip, AK4117_REG_Pd0) | (reg_read(chip, AK4117_REG_Pd1) << 8); 303 ucontrol->value.integer.value[3] = tmp; 304 return 0; 305 } 306 307 static int snd_ak4117_spdif_qinfo(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo) 308 { 309 uinfo->type = SNDRV_CTL_ELEM_TYPE_BYTES; 310 uinfo->count = AK4117_REG_QSUB_SIZE; 311 return 0; 312 } 313 314 static int snd_ak4117_spdif_qget(struct snd_kcontrol *kcontrol, 315 struct snd_ctl_elem_value *ucontrol) 316 { 317 struct ak4117 *chip = snd_kcontrol_chip(kcontrol); 318 unsigned i; 319 320 for (i = 0; i < AK4117_REG_QSUB_SIZE; i++) 321 ucontrol->value.bytes.data[i] = reg_read(chip, AK4117_REG_QSUB_ADDR + i); 322 return 0; 323 } 324 325 /* Don't forget to change AK4117_CONTROLS define!!! */ 326 static struct snd_kcontrol_new snd_ak4117_iec958_controls[] = { 327 { 328 .iface = SNDRV_CTL_ELEM_IFACE_PCM, 329 .name = "IEC958 Parity Errors", 330 .access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE, 331 .info = snd_ak4117_in_error_info, 332 .get = snd_ak4117_in_error_get, 333 .private_value = offsetof(struct ak4117, parity_errors), 334 }, 335 { 336 .iface = SNDRV_CTL_ELEM_IFACE_PCM, 337 .name = "IEC958 V-Bit Errors", 338 .access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE, 339 .info = snd_ak4117_in_error_info, 340 .get = snd_ak4117_in_error_get, 341 .private_value = offsetof(struct ak4117, v_bit_errors), 342 }, 343 { 344 .iface = SNDRV_CTL_ELEM_IFACE_PCM, 345 .name = "IEC958 C-CRC Errors", 346 .access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE, 347 .info = snd_ak4117_in_error_info, 348 .get = snd_ak4117_in_error_get, 349 .private_value = offsetof(struct ak4117, ccrc_errors), 350 }, 351 { 352 .iface = SNDRV_CTL_ELEM_IFACE_PCM, 353 .name = "IEC958 Q-CRC Errors", 354 .access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE, 355 .info = snd_ak4117_in_error_info, 356 .get = snd_ak4117_in_error_get, 357 .private_value = offsetof(struct ak4117, qcrc_errors), 358 }, 359 { 360 .iface = SNDRV_CTL_ELEM_IFACE_PCM, 361 .name = "IEC958 External Rate", 362 .access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE, 363 .info = snd_ak4117_rate_info, 364 .get = snd_ak4117_rate_get, 365 }, 366 { 367 .iface = SNDRV_CTL_ELEM_IFACE_PCM, 368 .name = SNDRV_CTL_NAME_IEC958("",CAPTURE,MASK), 369 .access = SNDRV_CTL_ELEM_ACCESS_READ, 370 .info = snd_ak4117_spdif_mask_info, 371 .get = snd_ak4117_spdif_mask_get, 372 }, 373 { 374 .iface = SNDRV_CTL_ELEM_IFACE_PCM, 375 .name = SNDRV_CTL_NAME_IEC958("",CAPTURE,DEFAULT), 376 .access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE, 377 .info = snd_ak4117_spdif_info, 378 .get = snd_ak4117_spdif_get, 379 }, 380 { 381 .iface = SNDRV_CTL_ELEM_IFACE_PCM, 382 .name = "IEC958 Preample Capture Default", 383 .access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE, 384 .info = snd_ak4117_spdif_pinfo, 385 .get = snd_ak4117_spdif_pget, 386 }, 387 { 388 .iface = SNDRV_CTL_ELEM_IFACE_PCM, 389 .name = "IEC958 Q-subcode Capture Default", 390 .access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE, 391 .info = snd_ak4117_spdif_qinfo, 392 .get = snd_ak4117_spdif_qget, 393 }, 394 { 395 .iface = SNDRV_CTL_ELEM_IFACE_PCM, 396 .name = "IEC958 Audio", 397 .access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE, 398 .info = snd_ak4117_in_bit_info, 399 .get = snd_ak4117_in_bit_get, 400 .private_value = (1<<31) | (3<<8) | AK4117_REG_RCS0, 401 }, 402 { 403 .iface = SNDRV_CTL_ELEM_IFACE_PCM, 404 .name = "IEC958 Non-PCM Bitstream", 405 .access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE, 406 .info = snd_ak4117_in_bit_info, 407 .get = snd_ak4117_in_bit_get, 408 .private_value = (5<<8) | AK4117_REG_RCS1, 409 }, 410 { 411 .iface = SNDRV_CTL_ELEM_IFACE_PCM, 412 .name = "IEC958 DTS Bitstream", 413 .access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE, 414 .info = snd_ak4117_in_bit_info, 415 .get = snd_ak4117_in_bit_get, 416 .private_value = (6<<8) | AK4117_REG_RCS1, 417 }, 418 { 419 .iface = SNDRV_CTL_ELEM_IFACE_PCM, 420 .name = "AK4117 Input Select", 421 .access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_WRITE, 422 .info = snd_ak4117_rx_info, 423 .get = snd_ak4117_rx_get, 424 .put = snd_ak4117_rx_put, 425 } 426 }; 427 428 int snd_ak4117_build(struct ak4117 *ak4117, struct snd_pcm_substream *cap_substream) 429 { 430 struct snd_kcontrol *kctl; 431 unsigned int idx; 432 int err; 433 434 if (snd_BUG_ON(!cap_substream)) 435 return -EINVAL; 436 ak4117->substream = cap_substream; 437 for (idx = 0; idx < AK4117_CONTROLS; idx++) { 438 kctl = snd_ctl_new1(&snd_ak4117_iec958_controls[idx], ak4117); 439 if (kctl == NULL) 440 return -ENOMEM; 441 kctl->id.device = cap_substream->pcm->device; 442 kctl->id.subdevice = cap_substream->number; 443 err = snd_ctl_add(ak4117->card, kctl); 444 if (err < 0) 445 return err; 446 ak4117->kctls[idx] = kctl; 447 } 448 return 0; 449 } 450 451 int snd_ak4117_external_rate(struct ak4117 *ak4117) 452 { 453 unsigned char rcs1; 454 455 rcs1 = reg_read(ak4117, AK4117_REG_RCS1); 456 return external_rate(rcs1); 457 } 458 459 int snd_ak4117_check_rate_and_errors(struct ak4117 *ak4117, unsigned int flags) 460 { 461 struct snd_pcm_runtime *runtime = ak4117->substream ? ak4117->substream->runtime : NULL; 462 unsigned long _flags; 463 int res = 0; 464 unsigned char rcs0, rcs1, rcs2; 465 unsigned char c0, c1; 466 467 rcs1 = reg_read(ak4117, AK4117_REG_RCS1); 468 if (flags & AK4117_CHECK_NO_STAT) 469 goto __rate; 470 rcs0 = reg_read(ak4117, AK4117_REG_RCS0); 471 rcs2 = reg_read(ak4117, AK4117_REG_RCS2); 472 // printk(KERN_DEBUG "AK IRQ: rcs0 = 0x%x, rcs1 = 0x%x, rcs2 = 0x%x\n", rcs0, rcs1, rcs2); 473 spin_lock_irqsave(&ak4117->lock, _flags); 474 if (rcs0 & AK4117_PAR) 475 ak4117->parity_errors++; 476 if (rcs0 & AK4117_V) 477 ak4117->v_bit_errors++; 478 if (rcs2 & AK4117_CCRC) 479 ak4117->ccrc_errors++; 480 if (rcs2 & AK4117_QCRC) 481 ak4117->qcrc_errors++; 482 c0 = (ak4117->rcs0 & (AK4117_QINT | AK4117_CINT | AK4117_STC | AK4117_AUDION | AK4117_AUTO | AK4117_UNLCK)) ^ 483 (rcs0 & (AK4117_QINT | AK4117_CINT | AK4117_STC | AK4117_AUDION | AK4117_AUTO | AK4117_UNLCK)); 484 c1 = (ak4117->rcs1 & (AK4117_DTSCD | AK4117_NPCM | AK4117_PEM | 0x0f)) ^ 485 (rcs1 & (AK4117_DTSCD | AK4117_NPCM | AK4117_PEM | 0x0f)); 486 ak4117->rcs0 = rcs0 & ~(AK4117_QINT | AK4117_CINT | AK4117_STC); 487 ak4117->rcs1 = rcs1; 488 ak4117->rcs2 = rcs2; 489 spin_unlock_irqrestore(&ak4117->lock, _flags); 490 491 if (rcs0 & AK4117_PAR) 492 snd_ctl_notify(ak4117->card, SNDRV_CTL_EVENT_MASK_VALUE, &ak4117->kctls[0]->id); 493 if (rcs0 & AK4117_V) 494 snd_ctl_notify(ak4117->card, SNDRV_CTL_EVENT_MASK_VALUE, &ak4117->kctls[1]->id); 495 if (rcs2 & AK4117_CCRC) 496 snd_ctl_notify(ak4117->card, SNDRV_CTL_EVENT_MASK_VALUE, &ak4117->kctls[2]->id); 497 if (rcs2 & AK4117_QCRC) 498 snd_ctl_notify(ak4117->card, SNDRV_CTL_EVENT_MASK_VALUE, &ak4117->kctls[3]->id); 499 500 /* rate change */ 501 if (c1 & 0x0f) 502 snd_ctl_notify(ak4117->card, SNDRV_CTL_EVENT_MASK_VALUE, &ak4117->kctls[4]->id); 503 504 if ((c1 & AK4117_PEM) | (c0 & AK4117_CINT)) 505 snd_ctl_notify(ak4117->card, SNDRV_CTL_EVENT_MASK_VALUE, &ak4117->kctls[6]->id); 506 if (c0 & AK4117_QINT) 507 snd_ctl_notify(ak4117->card, SNDRV_CTL_EVENT_MASK_VALUE, &ak4117->kctls[8]->id); 508 509 if (c0 & AK4117_AUDION) 510 snd_ctl_notify(ak4117->card, SNDRV_CTL_EVENT_MASK_VALUE, &ak4117->kctls[9]->id); 511 if (c1 & AK4117_NPCM) 512 snd_ctl_notify(ak4117->card, SNDRV_CTL_EVENT_MASK_VALUE, &ak4117->kctls[10]->id); 513 if (c1 & AK4117_DTSCD) 514 snd_ctl_notify(ak4117->card, SNDRV_CTL_EVENT_MASK_VALUE, &ak4117->kctls[11]->id); 515 516 if (ak4117->change_callback && (c0 | c1) != 0) 517 ak4117->change_callback(ak4117, c0, c1); 518 519 __rate: 520 /* compare rate */ 521 res = external_rate(rcs1); 522 if (!(flags & AK4117_CHECK_NO_RATE) && runtime && runtime->rate != res) { 523 snd_pcm_stream_lock_irqsave(ak4117->substream, _flags); 524 if (snd_pcm_running(ak4117->substream)) { 525 // printk(KERN_DEBUG "rate changed (%i <- %i)\n", runtime->rate, res); 526 snd_pcm_stop(ak4117->substream, SNDRV_PCM_STATE_DRAINING); 527 wake_up(&runtime->sleep); 528 res = 1; 529 } 530 snd_pcm_stream_unlock_irqrestore(ak4117->substream, _flags); 531 } 532 return res; 533 } 534 535 static void snd_ak4117_timer(unsigned long data) 536 { 537 struct ak4117 *chip = (struct ak4117 *)data; 538 539 if (chip->init) 540 return; 541 snd_ak4117_check_rate_and_errors(chip, 0); 542 chip->timer.expires = 1 + jiffies; 543 add_timer(&chip->timer); 544 } 545 546 EXPORT_SYMBOL(snd_ak4117_create); 547 EXPORT_SYMBOL(snd_ak4117_reg_write); 548 EXPORT_SYMBOL(snd_ak4117_reinit); 549 EXPORT_SYMBOL(snd_ak4117_build); 550 EXPORT_SYMBOL(snd_ak4117_external_rate); 551 EXPORT_SYMBOL(snd_ak4117_check_rate_and_errors); 552