1 /* 2 * Routines for control of the CS8427 via i2c bus 3 * IEC958 (S/PDIF) receiver & transmitter by Cirrus Logic 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 <linux/init.h> 26 #include <linux/bitrev.h> 27 #include <linux/module.h> 28 #include <asm/unaligned.h> 29 #include <sound/core.h> 30 #include <sound/control.h> 31 #include <sound/pcm.h> 32 #include <sound/cs8427.h> 33 #include <sound/asoundef.h> 34 35 static void snd_cs8427_reset(struct snd_i2c_device *cs8427); 36 37 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>"); 38 MODULE_DESCRIPTION("IEC958 (S/PDIF) receiver & transmitter by Cirrus Logic"); 39 MODULE_LICENSE("GPL"); 40 41 #define CS8427_ADDR (0x20>>1) /* fixed address */ 42 43 struct cs8427_stream { 44 struct snd_pcm_substream *substream; 45 char hw_status[24]; /* hardware status */ 46 char def_status[24]; /* default status */ 47 char pcm_status[24]; /* PCM private status */ 48 char hw_udata[32]; 49 struct snd_kcontrol *pcm_ctl; 50 }; 51 52 struct cs8427 { 53 unsigned char regmap[0x14]; /* map of first 1 + 13 registers */ 54 unsigned int rate; 55 unsigned int reset_timeout; 56 struct cs8427_stream playback; 57 struct cs8427_stream capture; 58 }; 59 60 int snd_cs8427_reg_write(struct snd_i2c_device *device, unsigned char reg, 61 unsigned char val) 62 { 63 int err; 64 unsigned char buf[2]; 65 66 buf[0] = reg & 0x7f; 67 buf[1] = val; 68 if ((err = snd_i2c_sendbytes(device, buf, 2)) != 2) { 69 snd_printk(KERN_ERR "unable to send bytes 0x%02x:0x%02x " 70 "to CS8427 (%i)\n", buf[0], buf[1], err); 71 return err < 0 ? err : -EIO; 72 } 73 return 0; 74 } 75 76 EXPORT_SYMBOL(snd_cs8427_reg_write); 77 78 static int snd_cs8427_reg_read(struct snd_i2c_device *device, unsigned char reg) 79 { 80 int err; 81 unsigned char buf; 82 83 if ((err = snd_i2c_sendbytes(device, ®, 1)) != 1) { 84 snd_printk(KERN_ERR "unable to send register 0x%x byte " 85 "to CS8427\n", reg); 86 return err < 0 ? err : -EIO; 87 } 88 if ((err = snd_i2c_readbytes(device, &buf, 1)) != 1) { 89 snd_printk(KERN_ERR "unable to read register 0x%x byte " 90 "from CS8427\n", reg); 91 return err < 0 ? err : -EIO; 92 } 93 return buf; 94 } 95 96 static int snd_cs8427_select_corudata(struct snd_i2c_device *device, int udata) 97 { 98 struct cs8427 *chip = device->private_data; 99 int err; 100 101 udata = udata ? CS8427_BSEL : 0; 102 if (udata != (chip->regmap[CS8427_REG_CSDATABUF] & udata)) { 103 chip->regmap[CS8427_REG_CSDATABUF] &= ~CS8427_BSEL; 104 chip->regmap[CS8427_REG_CSDATABUF] |= udata; 105 err = snd_cs8427_reg_write(device, CS8427_REG_CSDATABUF, 106 chip->regmap[CS8427_REG_CSDATABUF]); 107 if (err < 0) 108 return err; 109 } 110 return 0; 111 } 112 113 static int snd_cs8427_send_corudata(struct snd_i2c_device *device, 114 int udata, 115 unsigned char *ndata, 116 int count) 117 { 118 struct cs8427 *chip = device->private_data; 119 char *hw_data = udata ? 120 chip->playback.hw_udata : chip->playback.hw_status; 121 char data[32]; 122 int err, idx; 123 124 if (!memcmp(hw_data, ndata, count)) 125 return 0; 126 if ((err = snd_cs8427_select_corudata(device, udata)) < 0) 127 return err; 128 memcpy(hw_data, ndata, count); 129 if (udata) { 130 memset(data, 0, sizeof(data)); 131 if (memcmp(hw_data, data, count) == 0) { 132 chip->regmap[CS8427_REG_UDATABUF] &= ~CS8427_UBMMASK; 133 chip->regmap[CS8427_REG_UDATABUF] |= CS8427_UBMZEROS | 134 CS8427_EFTUI; 135 err = snd_cs8427_reg_write(device, CS8427_REG_UDATABUF, 136 chip->regmap[CS8427_REG_UDATABUF]); 137 return err < 0 ? err : 0; 138 } 139 } 140 data[0] = CS8427_REG_AUTOINC | CS8427_REG_CORU_DATABUF; 141 for (idx = 0; idx < count; idx++) 142 data[idx + 1] = bitrev8(ndata[idx]); 143 if (snd_i2c_sendbytes(device, data, count + 1) != count + 1) 144 return -EIO; 145 return 1; 146 } 147 148 static void snd_cs8427_free(struct snd_i2c_device *device) 149 { 150 kfree(device->private_data); 151 } 152 153 int snd_cs8427_init(struct snd_i2c_bus *bus, 154 struct snd_i2c_device *device) 155 { 156 static unsigned char initvals1[] = { 157 CS8427_REG_CONTROL1 | CS8427_REG_AUTOINC, 158 /* CS8427_REG_CONTROL1: RMCK to OMCK, valid PCM audio, disable mutes, 159 TCBL=output */ 160 CS8427_SWCLK | CS8427_TCBLDIR, 161 /* CS8427_REG_CONTROL2: hold last valid audio sample, RMCK=256*Fs, 162 normal stereo operation */ 163 0x00, 164 /* CS8427_REG_DATAFLOW: output drivers normal operation, Tx<=serial, 165 Rx=>serial */ 166 CS8427_TXDSERIAL | CS8427_SPDAES3RECEIVER, 167 /* CS8427_REG_CLOCKSOURCE: Run off, CMCK=256*Fs, 168 output time base = OMCK, input time base = recovered input clock, 169 recovered input clock source is ILRCK changed to AES3INPUT 170 (workaround, see snd_cs8427_reset) */ 171 CS8427_RXDILRCK, 172 /* CS8427_REG_SERIALINPUT: Serial audio input port data format = I2S, 173 24-bit, 64*Fsi */ 174 CS8427_SIDEL | CS8427_SILRPOL, 175 /* CS8427_REG_SERIALOUTPUT: Serial audio output port data format 176 = I2S, 24-bit, 64*Fsi */ 177 CS8427_SODEL | CS8427_SOLRPOL, 178 }; 179 static unsigned char initvals2[] = { 180 CS8427_REG_RECVERRMASK | CS8427_REG_AUTOINC, 181 /* CS8427_REG_RECVERRMASK: unmask the input PLL clock, V, confidence, 182 biphase, parity status bits */ 183 /* CS8427_UNLOCK | CS8427_V | CS8427_CONF | CS8427_BIP | CS8427_PAR,*/ 184 0xff, /* set everything */ 185 /* CS8427_REG_CSDATABUF: 186 Registers 32-55 window to CS buffer 187 Inhibit D->E transfers from overwriting first 5 bytes of CS data. 188 Inhibit D->E transfers (all) of CS data. 189 Allow E->F transfer of CS data. 190 One byte mode; both A/B channels get same written CB data. 191 A channel info is output to chip's EMPH* pin. */ 192 CS8427_CBMR | CS8427_DETCI, 193 /* CS8427_REG_UDATABUF: 194 Use internal buffer to transmit User (U) data. 195 Chip's U pin is an output. 196 Transmit all O's for user data. 197 Inhibit D->E transfers. 198 Inhibit E->F transfers. */ 199 CS8427_UD | CS8427_EFTUI | CS8427_DETUI, 200 }; 201 struct cs8427 *chip = device->private_data; 202 int err; 203 unsigned char buf[24]; 204 205 snd_i2c_lock(bus); 206 err = snd_cs8427_reg_read(device, CS8427_REG_ID_AND_VER); 207 if (err != CS8427_VER8427A) { 208 /* give second chance */ 209 snd_printk(KERN_WARNING "invalid CS8427 signature 0x%x: " 210 "let me try again...\n", err); 211 err = snd_cs8427_reg_read(device, CS8427_REG_ID_AND_VER); 212 } 213 if (err != CS8427_VER8427A) { 214 snd_i2c_unlock(bus); 215 snd_printk(KERN_ERR "unable to find CS8427 signature " 216 "(expected 0x%x, read 0x%x),\n", 217 CS8427_VER8427A, err); 218 snd_printk(KERN_ERR " initialization is not completed\n"); 219 return -EFAULT; 220 } 221 /* turn off run bit while making changes to configuration */ 222 err = snd_cs8427_reg_write(device, CS8427_REG_CLOCKSOURCE, 0x00); 223 if (err < 0) 224 goto __fail; 225 /* send initial values */ 226 memcpy(chip->regmap + (initvals1[0] & 0x7f), initvals1 + 1, 6); 227 if ((err = snd_i2c_sendbytes(device, initvals1, 7)) != 7) { 228 err = err < 0 ? err : -EIO; 229 goto __fail; 230 } 231 /* Turn off CS8427 interrupt stuff that is not used in hardware */ 232 memset(buf, 0, 7); 233 /* from address 9 to 15 */ 234 buf[0] = 9; /* register */ 235 if ((err = snd_i2c_sendbytes(device, buf, 7)) != 7) 236 goto __fail; 237 /* send transfer initialization sequence */ 238 memcpy(chip->regmap + (initvals2[0] & 0x7f), initvals2 + 1, 3); 239 if ((err = snd_i2c_sendbytes(device, initvals2, 4)) != 4) { 240 err = err < 0 ? err : -EIO; 241 goto __fail; 242 } 243 /* write default channel status bytes */ 244 put_unaligned_le32(SNDRV_PCM_DEFAULT_CON_SPDIF, buf); 245 memset(buf + 4, 0, 24 - 4); 246 if (snd_cs8427_send_corudata(device, 0, buf, 24) < 0) 247 goto __fail; 248 memcpy(chip->playback.def_status, buf, 24); 249 memcpy(chip->playback.pcm_status, buf, 24); 250 snd_i2c_unlock(bus); 251 252 /* turn on run bit and rock'n'roll */ 253 snd_cs8427_reset(device); 254 255 return 0; 256 257 __fail: 258 snd_i2c_unlock(bus); 259 260 return err; 261 } 262 EXPORT_SYMBOL(snd_cs8427_init); 263 264 int snd_cs8427_create(struct snd_i2c_bus *bus, 265 unsigned char addr, 266 unsigned int reset_timeout, 267 struct snd_i2c_device **r_cs8427) 268 { 269 int err; 270 struct cs8427 *chip; 271 struct snd_i2c_device *device; 272 273 err = snd_i2c_device_create(bus, "CS8427", CS8427_ADDR | (addr & 7), 274 &device); 275 if (err < 0) 276 return err; 277 chip = device->private_data = kzalloc(sizeof(*chip), GFP_KERNEL); 278 if (chip == NULL) { 279 snd_i2c_device_free(device); 280 return -ENOMEM; 281 } 282 device->private_free = snd_cs8427_free; 283 284 if (reset_timeout < 1) 285 reset_timeout = 1; 286 chip->reset_timeout = reset_timeout; 287 288 err = snd_cs8427_init(bus, device); 289 if (err) 290 goto __fail; 291 292 #if 0 // it's nice for read tests 293 { 294 char buf[128]; 295 int xx; 296 buf[0] = 0x81; 297 snd_i2c_sendbytes(device, buf, 1); 298 snd_i2c_readbytes(device, buf, 127); 299 for (xx = 0; xx < 127; xx++) 300 printk(KERN_DEBUG "reg[0x%x] = 0x%x\n", xx+1, buf[xx]); 301 } 302 #endif 303 304 if (r_cs8427) 305 *r_cs8427 = device; 306 return 0; 307 308 __fail: 309 snd_i2c_device_free(device); 310 return err < 0 ? err : -EIO; 311 } 312 313 EXPORT_SYMBOL(snd_cs8427_create); 314 315 /* 316 * Reset the chip using run bit, also lock PLL using ILRCK and 317 * put back AES3INPUT. This workaround is described in latest 318 * CS8427 datasheet, otherwise TXDSERIAL will not work. 319 */ 320 static void snd_cs8427_reset(struct snd_i2c_device *cs8427) 321 { 322 struct cs8427 *chip; 323 unsigned long end_time; 324 int data, aes3input = 0; 325 326 if (snd_BUG_ON(!cs8427)) 327 return; 328 chip = cs8427->private_data; 329 snd_i2c_lock(cs8427->bus); 330 if ((chip->regmap[CS8427_REG_CLOCKSOURCE] & CS8427_RXDAES3INPUT) == 331 CS8427_RXDAES3INPUT) /* AES3 bit is set */ 332 aes3input = 1; 333 chip->regmap[CS8427_REG_CLOCKSOURCE] &= ~(CS8427_RUN | CS8427_RXDMASK); 334 snd_cs8427_reg_write(cs8427, CS8427_REG_CLOCKSOURCE, 335 chip->regmap[CS8427_REG_CLOCKSOURCE]); 336 udelay(200); 337 chip->regmap[CS8427_REG_CLOCKSOURCE] |= CS8427_RUN | CS8427_RXDILRCK; 338 snd_cs8427_reg_write(cs8427, CS8427_REG_CLOCKSOURCE, 339 chip->regmap[CS8427_REG_CLOCKSOURCE]); 340 udelay(200); 341 snd_i2c_unlock(cs8427->bus); 342 end_time = jiffies + chip->reset_timeout; 343 while (time_after_eq(end_time, jiffies)) { 344 snd_i2c_lock(cs8427->bus); 345 data = snd_cs8427_reg_read(cs8427, CS8427_REG_RECVERRORS); 346 snd_i2c_unlock(cs8427->bus); 347 if (!(data & CS8427_UNLOCK)) 348 break; 349 schedule_timeout_uninterruptible(1); 350 } 351 snd_i2c_lock(cs8427->bus); 352 chip->regmap[CS8427_REG_CLOCKSOURCE] &= ~CS8427_RXDMASK; 353 if (aes3input) 354 chip->regmap[CS8427_REG_CLOCKSOURCE] |= CS8427_RXDAES3INPUT; 355 snd_cs8427_reg_write(cs8427, CS8427_REG_CLOCKSOURCE, 356 chip->regmap[CS8427_REG_CLOCKSOURCE]); 357 snd_i2c_unlock(cs8427->bus); 358 } 359 360 static int snd_cs8427_in_status_info(struct snd_kcontrol *kcontrol, 361 struct snd_ctl_elem_info *uinfo) 362 { 363 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; 364 uinfo->count = 1; 365 uinfo->value.integer.min = 0; 366 uinfo->value.integer.max = 255; 367 return 0; 368 } 369 370 static int snd_cs8427_in_status_get(struct snd_kcontrol *kcontrol, 371 struct snd_ctl_elem_value *ucontrol) 372 { 373 struct snd_i2c_device *device = snd_kcontrol_chip(kcontrol); 374 int data; 375 376 snd_i2c_lock(device->bus); 377 data = snd_cs8427_reg_read(device, kcontrol->private_value); 378 snd_i2c_unlock(device->bus); 379 if (data < 0) 380 return data; 381 ucontrol->value.integer.value[0] = data; 382 return 0; 383 } 384 385 static int snd_cs8427_qsubcode_info(struct snd_kcontrol *kcontrol, 386 struct snd_ctl_elem_info *uinfo) 387 { 388 uinfo->type = SNDRV_CTL_ELEM_TYPE_BYTES; 389 uinfo->count = 10; 390 return 0; 391 } 392 393 static int snd_cs8427_qsubcode_get(struct snd_kcontrol *kcontrol, 394 struct snd_ctl_elem_value *ucontrol) 395 { 396 struct snd_i2c_device *device = snd_kcontrol_chip(kcontrol); 397 unsigned char reg = CS8427_REG_QSUBCODE; 398 int err; 399 400 snd_i2c_lock(device->bus); 401 if ((err = snd_i2c_sendbytes(device, ®, 1)) != 1) { 402 snd_printk(KERN_ERR "unable to send register 0x%x byte " 403 "to CS8427\n", reg); 404 snd_i2c_unlock(device->bus); 405 return err < 0 ? err : -EIO; 406 } 407 err = snd_i2c_readbytes(device, ucontrol->value.bytes.data, 10); 408 if (err != 10) { 409 snd_printk(KERN_ERR "unable to read Q-subcode bytes " 410 "from CS8427\n"); 411 snd_i2c_unlock(device->bus); 412 return err < 0 ? err : -EIO; 413 } 414 snd_i2c_unlock(device->bus); 415 return 0; 416 } 417 418 static int snd_cs8427_spdif_info(struct snd_kcontrol *kcontrol, 419 struct snd_ctl_elem_info *uinfo) 420 { 421 uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958; 422 uinfo->count = 1; 423 return 0; 424 } 425 426 static int snd_cs8427_spdif_get(struct snd_kcontrol *kcontrol, 427 struct snd_ctl_elem_value *ucontrol) 428 { 429 struct snd_i2c_device *device = snd_kcontrol_chip(kcontrol); 430 struct cs8427 *chip = device->private_data; 431 432 snd_i2c_lock(device->bus); 433 memcpy(ucontrol->value.iec958.status, chip->playback.def_status, 24); 434 snd_i2c_unlock(device->bus); 435 return 0; 436 } 437 438 static int snd_cs8427_spdif_put(struct snd_kcontrol *kcontrol, 439 struct snd_ctl_elem_value *ucontrol) 440 { 441 struct snd_i2c_device *device = snd_kcontrol_chip(kcontrol); 442 struct cs8427 *chip = device->private_data; 443 unsigned char *status = kcontrol->private_value ? 444 chip->playback.pcm_status : chip->playback.def_status; 445 struct snd_pcm_runtime *runtime = chip->playback.substream ? 446 chip->playback.substream->runtime : NULL; 447 int err, change; 448 449 snd_i2c_lock(device->bus); 450 change = memcmp(ucontrol->value.iec958.status, status, 24) != 0; 451 memcpy(status, ucontrol->value.iec958.status, 24); 452 if (change && (kcontrol->private_value ? 453 runtime != NULL : runtime == NULL)) { 454 err = snd_cs8427_send_corudata(device, 0, status, 24); 455 if (err < 0) 456 change = err; 457 } 458 snd_i2c_unlock(device->bus); 459 return change; 460 } 461 462 static int snd_cs8427_spdif_mask_info(struct snd_kcontrol *kcontrol, 463 struct snd_ctl_elem_info *uinfo) 464 { 465 uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958; 466 uinfo->count = 1; 467 return 0; 468 } 469 470 static int snd_cs8427_spdif_mask_get(struct snd_kcontrol *kcontrol, 471 struct snd_ctl_elem_value *ucontrol) 472 { 473 memset(ucontrol->value.iec958.status, 0xff, 24); 474 return 0; 475 } 476 477 static struct snd_kcontrol_new snd_cs8427_iec958_controls[] = { 478 { 479 .iface = SNDRV_CTL_ELEM_IFACE_PCM, 480 .info = snd_cs8427_in_status_info, 481 .name = "IEC958 CS8427 Input Status", 482 .access = (SNDRV_CTL_ELEM_ACCESS_READ | 483 SNDRV_CTL_ELEM_ACCESS_VOLATILE), 484 .get = snd_cs8427_in_status_get, 485 .private_value = 15, 486 }, 487 { 488 .iface = SNDRV_CTL_ELEM_IFACE_PCM, 489 .info = snd_cs8427_in_status_info, 490 .name = "IEC958 CS8427 Error Status", 491 .access = (SNDRV_CTL_ELEM_ACCESS_READ | 492 SNDRV_CTL_ELEM_ACCESS_VOLATILE), 493 .get = snd_cs8427_in_status_get, 494 .private_value = 16, 495 }, 496 { 497 .access = SNDRV_CTL_ELEM_ACCESS_READ, 498 .iface = SNDRV_CTL_ELEM_IFACE_PCM, 499 .name = SNDRV_CTL_NAME_IEC958("",PLAYBACK,MASK), 500 .info = snd_cs8427_spdif_mask_info, 501 .get = snd_cs8427_spdif_mask_get, 502 }, 503 { 504 .iface = SNDRV_CTL_ELEM_IFACE_PCM, 505 .name = SNDRV_CTL_NAME_IEC958("",PLAYBACK,DEFAULT), 506 .info = snd_cs8427_spdif_info, 507 .get = snd_cs8427_spdif_get, 508 .put = snd_cs8427_spdif_put, 509 .private_value = 0 510 }, 511 { 512 .access = (SNDRV_CTL_ELEM_ACCESS_READWRITE | 513 SNDRV_CTL_ELEM_ACCESS_INACTIVE), 514 .iface = SNDRV_CTL_ELEM_IFACE_PCM, 515 .name = SNDRV_CTL_NAME_IEC958("",PLAYBACK,PCM_STREAM), 516 .info = snd_cs8427_spdif_info, 517 .get = snd_cs8427_spdif_get, 518 .put = snd_cs8427_spdif_put, 519 .private_value = 1 520 }, 521 { 522 .iface = SNDRV_CTL_ELEM_IFACE_PCM, 523 .info = snd_cs8427_qsubcode_info, 524 .name = "IEC958 Q-subcode Capture Default", 525 .access = (SNDRV_CTL_ELEM_ACCESS_READ | 526 SNDRV_CTL_ELEM_ACCESS_VOLATILE), 527 .get = snd_cs8427_qsubcode_get 528 }}; 529 530 int snd_cs8427_iec958_build(struct snd_i2c_device *cs8427, 531 struct snd_pcm_substream *play_substream, 532 struct snd_pcm_substream *cap_substream) 533 { 534 struct cs8427 *chip = cs8427->private_data; 535 struct snd_kcontrol *kctl; 536 unsigned int idx; 537 int err; 538 539 if (snd_BUG_ON(!play_substream || !cap_substream)) 540 return -EINVAL; 541 for (idx = 0; idx < ARRAY_SIZE(snd_cs8427_iec958_controls); idx++) { 542 kctl = snd_ctl_new1(&snd_cs8427_iec958_controls[idx], cs8427); 543 if (kctl == NULL) 544 return -ENOMEM; 545 kctl->id.device = play_substream->pcm->device; 546 kctl->id.subdevice = play_substream->number; 547 err = snd_ctl_add(cs8427->bus->card, kctl); 548 if (err < 0) 549 return err; 550 if (! strcmp(kctl->id.name, 551 SNDRV_CTL_NAME_IEC958("",PLAYBACK,PCM_STREAM))) 552 chip->playback.pcm_ctl = kctl; 553 } 554 555 chip->playback.substream = play_substream; 556 chip->capture.substream = cap_substream; 557 if (snd_BUG_ON(!chip->playback.pcm_ctl)) 558 return -EIO; 559 return 0; 560 } 561 562 EXPORT_SYMBOL(snd_cs8427_iec958_build); 563 564 int snd_cs8427_iec958_active(struct snd_i2c_device *cs8427, int active) 565 { 566 struct cs8427 *chip; 567 568 if (snd_BUG_ON(!cs8427)) 569 return -ENXIO; 570 chip = cs8427->private_data; 571 if (active) 572 memcpy(chip->playback.pcm_status, 573 chip->playback.def_status, 24); 574 chip->playback.pcm_ctl->vd[0].access &= ~SNDRV_CTL_ELEM_ACCESS_INACTIVE; 575 snd_ctl_notify(cs8427->bus->card, 576 SNDRV_CTL_EVENT_MASK_VALUE | SNDRV_CTL_EVENT_MASK_INFO, 577 &chip->playback.pcm_ctl->id); 578 return 0; 579 } 580 581 EXPORT_SYMBOL(snd_cs8427_iec958_active); 582 583 int snd_cs8427_iec958_pcm(struct snd_i2c_device *cs8427, unsigned int rate) 584 { 585 struct cs8427 *chip; 586 char *status; 587 int err, reset; 588 589 if (snd_BUG_ON(!cs8427)) 590 return -ENXIO; 591 chip = cs8427->private_data; 592 status = chip->playback.pcm_status; 593 snd_i2c_lock(cs8427->bus); 594 if (status[0] & IEC958_AES0_PROFESSIONAL) { 595 status[0] &= ~IEC958_AES0_PRO_FS; 596 switch (rate) { 597 case 32000: status[0] |= IEC958_AES0_PRO_FS_32000; break; 598 case 44100: status[0] |= IEC958_AES0_PRO_FS_44100; break; 599 case 48000: status[0] |= IEC958_AES0_PRO_FS_48000; break; 600 default: status[0] |= IEC958_AES0_PRO_FS_NOTID; break; 601 } 602 } else { 603 status[3] &= ~IEC958_AES3_CON_FS; 604 switch (rate) { 605 case 32000: status[3] |= IEC958_AES3_CON_FS_32000; break; 606 case 44100: status[3] |= IEC958_AES3_CON_FS_44100; break; 607 case 48000: status[3] |= IEC958_AES3_CON_FS_48000; break; 608 } 609 } 610 err = snd_cs8427_send_corudata(cs8427, 0, status, 24); 611 if (err > 0) 612 snd_ctl_notify(cs8427->bus->card, 613 SNDRV_CTL_EVENT_MASK_VALUE, 614 &chip->playback.pcm_ctl->id); 615 reset = chip->rate != rate; 616 chip->rate = rate; 617 snd_i2c_unlock(cs8427->bus); 618 if (reset) 619 snd_cs8427_reset(cs8427); 620 return err < 0 ? err : 0; 621 } 622 623 EXPORT_SYMBOL(snd_cs8427_iec958_pcm); 624 625 static int __init alsa_cs8427_module_init(void) 626 { 627 return 0; 628 } 629 630 static void __exit alsa_cs8427_module_exit(void) 631 { 632 } 633 634 module_init(alsa_cs8427_module_init) 635 module_exit(alsa_cs8427_module_exit) 636