git.oblomov.eu Git - linux-2.6/blob - sound/i2c/cs8427.c

   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@suse.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 <sound/driver.h>
  24 #include <linux/slab.h>
  25 #include <linux/delay.h>
  26 #include <linux/init.h>
  27 #include <sound/core.h>
  28 #include <sound/control.h>
  29 #include <sound/pcm.h>
  30 #include <sound/cs8427.h>
  31 #include <sound/asoundef.h>
  32
  33 static void snd_cs8427_reset(struct snd_i2c_device *cs8427);
  34
  35 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>");
  36 MODULE_DESCRIPTION("IEC958 (S/PDIF) receiver & transmitter by Cirrus Logic");
  37 MODULE_LICENSE("GPL");
  38
  39 #define CS8427_ADDR                     (0x20>>1) /* fixed address */
  40
  41 struct cs8427_stream {
  42         struct snd_pcm_substream *substream;
  43         char hw_status[24];             /* hardware status */
  44         char def_status[24];            /* default status */
  45         char pcm_status[24];            /* PCM private status */
  46         char hw_udata[32];
  47         struct snd_kcontrol *pcm_ctl;
  48 };
  49
  50 struct cs8427 {
  51         unsigned char regmap[0x14];     /* map of first 1 + 13 registers */
  52         unsigned int rate;
  53         unsigned int reset_timeout;
  54         struct cs8427_stream playback;
  55         struct cs8427_stream capture;
  56 };
  57
  58 static unsigned char swapbits(unsigned char val)
  59 {
  60         int bit;
  61         unsigned char res = 0;
  62         for (bit = 0; bit < 8; bit++) {
  63                 res <<= 1;
  64                 res |= val & 1;
  65                 val >>= 1;
  66         }
  67         return res;
  68 }
  69
  70 int snd_cs8427_reg_write(struct snd_i2c_device *device, unsigned char reg,
  71                          unsigned char val)
  72 {
  73         int err;
  74         unsigned char buf[2];
  75
  76         buf[0] = reg & 0x7f;
  77         buf[1] = val;
  78         if ((err = snd_i2c_sendbytes(device, buf, 2)) != 2) {
  79                 snd_printk(KERN_ERR "unable to send bytes 0x%02x:0x%02x "
  80                            "to CS8427 (%i)\n", buf[0], buf[1], err);
  81                 return err < 0 ? err : -EIO;
  82         }
  83         return 0;
  84 }
  85
  86 EXPORT_SYMBOL(snd_cs8427_reg_write);
  87
  88 static int snd_cs8427_reg_read(struct snd_i2c_device *device, unsigned char reg)
  89 {
  90         int err;
  91         unsigned char buf;
  92
  93         if ((err = snd_i2c_sendbytes(device, &reg, 1)) != 1) {
  94                 snd_printk(KERN_ERR "unable to send register 0x%x byte "
  95                            "to CS8427\n", reg);
  96                 return err < 0 ? err : -EIO;
  97         }
  98         if ((err = snd_i2c_readbytes(device, &buf, 1)) != 1) {
  99                 snd_printk(KERN_ERR "unable to read register 0x%x byte "
 100                            "from CS8427\n", reg);
 101                 return err < 0 ? err : -EIO;
 102         }
 103         return buf;
 104 }
 105
 106 static int snd_cs8427_select_corudata(struct snd_i2c_device *device, int udata)
 107 {
 108         struct cs8427 *chip = device->private_data;
 109         int err;
 110
 111         udata = udata ? CS8427_BSEL : 0;
 112         if (udata != (chip->regmap[CS8427_REG_CSDATABUF] & udata)) {
 113                 chip->regmap[CS8427_REG_CSDATABUF] &= ~CS8427_BSEL;
 114                 chip->regmap[CS8427_REG_CSDATABUF] |= udata;
 115                 err = snd_cs8427_reg_write(device, CS8427_REG_CSDATABUF,
 116                                            chip->regmap[CS8427_REG_CSDATABUF]);
 117                 if (err < 0)
 118                         return err;
 119         }
 120         return 0;
 121 }
 122
 123 static int snd_cs8427_send_corudata(struct snd_i2c_device *device,
 124                                     int udata,
 125                                     unsigned char *ndata,
 126                                     int count)
 127 {
 128         struct cs8427 *chip = device->private_data;
 129         char *hw_data = udata ?
 130                 chip->playback.hw_udata : chip->playback.hw_status;
 131         char data[32];
 132         int err, idx;
 133
 134         if (!memcmp(hw_data, ndata, count))
 135                 return 0;
 136         if ((err = snd_cs8427_select_corudata(device, udata)) < 0)
 137                 return err;
 138         memcpy(hw_data, ndata, count);
 139         if (udata) {
 140                 memset(data, 0, sizeof(data));
 141                 if (memcmp(hw_data, data, count) == 0) {
 142                         chip->regmap[CS8427_REG_UDATABUF] &= ~CS8427_UBMMASK;
 143                         chip->regmap[CS8427_REG_UDATABUF] |= CS8427_UBMZEROS |
 144                                 CS8427_EFTUI;
 145                         err = snd_cs8427_reg_write(device, CS8427_REG_UDATABUF,
 146                                                    chip->regmap[CS8427_REG_UDATABUF]);
 147                         return err < 0 ? err : 0;
 148                 }
 149         }
 150         data[0] = CS8427_REG_AUTOINC | CS8427_REG_CORU_DATABUF;
 151         for (idx = 0; idx < count; idx++)
 152                 data[idx + 1] = swapbits(ndata[idx]);
 153         if (snd_i2c_sendbytes(device, data, count + 1) != count + 1)
 154                 return -EIO;
 155         return 1;
 156 }
 157
 158 static void snd_cs8427_free(struct snd_i2c_device *device)
 159 {
 160         kfree(device->private_data);
 161 }
 162
 163 int snd_cs8427_create(struct snd_i2c_bus *bus,
 164                       unsigned char addr,
 165                       unsigned int reset_timeout,
 166                       struct snd_i2c_device **r_cs8427)
 167 {
 168         static unsigned char initvals1[] = {
 169           CS8427_REG_CONTROL1 | CS8427_REG_AUTOINC,
 170           /* CS8427_REG_CONTROL1: RMCK to OMCK, valid PCM audio, disable mutes,
 171              TCBL=output */
 172           CS8427_SWCLK | CS8427_TCBLDIR,
 173           /* CS8427_REG_CONTROL2: hold last valid audio sample, RMCK=256*Fs,
 174              normal stereo operation */
 175           0x00,
 176           /* CS8427_REG_DATAFLOW: output drivers normal operation, Tx<=serial,
 177              Rx=>serial */
 178           CS8427_TXDSERIAL | CS8427_SPDAES3RECEIVER,
 179           /* CS8427_REG_CLOCKSOURCE: Run off, CMCK=256*Fs,
 180              output time base = OMCK, input time base = recovered input clock,
 181              recovered input clock source is ILRCK changed to AES3INPUT
 182              (workaround, see snd_cs8427_reset) */
 183           CS8427_RXDILRCK,
 184           /* CS8427_REG_SERIALINPUT: Serial audio input port data format = I2S,
 185              24-bit, 64*Fsi */
 186           CS8427_SIDEL | CS8427_SILRPOL,
 187           /* CS8427_REG_SERIALOUTPUT: Serial audio output port data format
 188              = I2S, 24-bit, 64*Fsi */
 189           CS8427_SODEL | CS8427_SOLRPOL,
 190         };
 191         static unsigned char initvals2[] = {
 192           CS8427_REG_RECVERRMASK | CS8427_REG_AUTOINC,
 193           /* CS8427_REG_RECVERRMASK: unmask the input PLL clock, V, confidence,
 194              biphase, parity status bits */
 195           /* CS8427_UNLOCK | CS8427_V | CS8427_CONF | CS8427_BIP | CS8427_PAR,*/
 196           0xff, /* set everything */
 197           /* CS8427_REG_CSDATABUF:
 198              Registers 32-55 window to CS buffer
 199              Inhibit D->E transfers from overwriting first 5 bytes of CS data.
 200              Inhibit D->E transfers (all) of CS data.
 201              Allow E->F transfer of CS data.
 202              One byte mode; both A/B channels get same written CB data.
 203              A channel info is output to chip's EMPH* pin. */
 204           CS8427_CBMR | CS8427_DETCI,
 205           /* CS8427_REG_UDATABUF:
 206              Use internal buffer to transmit User (U) data.
 207              Chip's U pin is an output.
 208              Transmit all O's for user data.
 209              Inhibit D->E transfers.
 210              Inhibit E->F transfers. */
 211           CS8427_UD | CS8427_EFTUI | CS8427_DETUI,
 212         };
 213         int err;
 214         struct cs8427 *chip;
 215         struct snd_i2c_device *device;
 216         unsigned char buf[24];
 217
 218         if ((err = snd_i2c_device_create(bus, "CS8427",
 219                                          CS8427_ADDR | (addr & 7),
 220                                          &device)) < 0)
 221                 return err;
 222         chip = device->private_data = kzalloc(sizeof(*chip), GFP_KERNEL);
 223         if (chip == NULL) {
 224                 snd_i2c_device_free(device);
 225                 return -ENOMEM;
 226         }
 227         device->private_free = snd_cs8427_free;
 228
 229         snd_i2c_lock(bus);
 230         err = snd_cs8427_reg_read(device, CS8427_REG_ID_AND_VER);
 231         if (err != CS8427_VER8427A) {
 232                 snd_i2c_unlock(bus);
 233                 snd_printk(KERN_ERR "unable to find CS8427 signature "
 234                            "(expected 0x%x, read 0x%x),\n",
 235                            CS8427_VER8427A, err);
 236                 snd_printk(KERN_ERR "   initialization is not completed\n");
 237                 return -EFAULT;
 238         }
 239         /* turn off run bit while making changes to configuration */
 240         err = snd_cs8427_reg_write(device, CS8427_REG_CLOCKSOURCE, 0x00);
 241         if (err < 0)
 242                 goto __fail;
 243         /* send initial values */
 244         memcpy(chip->regmap + (initvals1[0] & 0x7f), initvals1 + 1, 6);
 245         if ((err = snd_i2c_sendbytes(device, initvals1, 7)) != 7) {
 246                 err = err < 0 ? err : -EIO;
 247                 goto __fail;
 248         }
 249         /* Turn off CS8427 interrupt stuff that is not used in hardware */
 250         memset(buf, 0, 7);
 251         /* from address 9 to 15 */
 252         buf[0] = 9;     /* register */
 253         if ((err = snd_i2c_sendbytes(device, buf, 7)) != 7)
 254                 goto __fail;
 255         /* send transfer initialization sequence */
 256         memcpy(chip->regmap + (initvals2[0] & 0x7f), initvals2 + 1, 3);
 257         if ((err = snd_i2c_sendbytes(device, initvals2, 4)) != 4) {
 258                 err = err < 0 ? err : -EIO;
 259                 goto __fail;
 260         }
 261         /* write default channel status bytes */
 262         buf[0] = ((unsigned char)(SNDRV_PCM_DEFAULT_CON_SPDIF >> 0));
 263         buf[1] = ((unsigned char)(SNDRV_PCM_DEFAULT_CON_SPDIF >> 8));
 264         buf[2] = ((unsigned char)(SNDRV_PCM_DEFAULT_CON_SPDIF >> 16));
 265         buf[3] = ((unsigned char)(SNDRV_PCM_DEFAULT_CON_SPDIF >> 24));
 266         memset(buf + 4, 0, 24 - 4);
 267         if (snd_cs8427_send_corudata(device, 0, buf, 24) < 0)
 268                 goto __fail;
 269         memcpy(chip->playback.def_status, buf, 24);
 270         memcpy(chip->playback.pcm_status, buf, 24);
 271         snd_i2c_unlock(bus);
 272
 273         /* turn on run bit and rock'n'roll */
 274         if (reset_timeout < 1)
 275                 reset_timeout = 1;
 276         chip->reset_timeout = reset_timeout;
 277         snd_cs8427_reset(device);
 278
 279 #if 0   // it's nice for read tests
 280         {
 281         char buf[128];
 282         int xx;
 283         buf[0] = 0x81;
 284         snd_i2c_sendbytes(device, buf, 1);
 285         snd_i2c_readbytes(device, buf, 127);
 286         for (xx = 0; xx < 127; xx++)
 287                 printk(KERN_DEBUG "reg[0x%x] = 0x%x\n", xx+1, buf[xx]);
 288         }
 289 #endif
 290
 291         if (r_cs8427)
 292                 *r_cs8427 = device;
 293         return 0;
 294
 295       __fail:
 296         snd_i2c_unlock(bus);
 297         snd_i2c_device_free(device);
 298         return err < 0 ? err : -EIO;
 299 }
 300
 301 EXPORT_SYMBOL(snd_cs8427_create);
 302
 303 /*
 304  * Reset the chip using run bit, also lock PLL using ILRCK and
 305  * put back AES3INPUT. This workaround is described in latest
 306  * CS8427 datasheet, otherwise TXDSERIAL will not work.
 307  */
 308 static void snd_cs8427_reset(struct snd_i2c_device *cs8427)
 309 {
 310         struct cs8427 *chip;
 311         unsigned long end_time;
 312         int data, aes3input = 0;
 313
 314         snd_assert(cs8427, return);
 315         chip = cs8427->private_data;
 316         snd_i2c_lock(cs8427->bus);
 317         if ((chip->regmap[CS8427_REG_CLOCKSOURCE] & CS8427_RXDAES3INPUT) ==
 318             CS8427_RXDAES3INPUT)  /* AES3 bit is set */
 319                 aes3input = 1;
 320         chip->regmap[CS8427_REG_CLOCKSOURCE] &= ~(CS8427_RUN | CS8427_RXDMASK);
 321         snd_cs8427_reg_write(cs8427, CS8427_REG_CLOCKSOURCE,
 322                              chip->regmap[CS8427_REG_CLOCKSOURCE]);
 323         udelay(200);
 324         chip->regmap[CS8427_REG_CLOCKSOURCE] |= CS8427_RUN | CS8427_RXDILRCK;
 325         snd_cs8427_reg_write(cs8427, CS8427_REG_CLOCKSOURCE,
 326                              chip->regmap[CS8427_REG_CLOCKSOURCE]);
 327         udelay(200);
 328         snd_i2c_unlock(cs8427->bus);
 329         end_time = jiffies + chip->reset_timeout;
 330         while (time_after_eq(end_time, jiffies)) {
 331                 snd_i2c_lock(cs8427->bus);
 332                 data = snd_cs8427_reg_read(cs8427, CS8427_REG_RECVERRORS);
 333                 snd_i2c_unlock(cs8427->bus);
 334                 if (!(data & CS8427_UNLOCK))
 335                         break;
 336                 schedule_timeout_uninterruptible(1);
 337         }
 338         snd_i2c_lock(cs8427->bus);
 339         chip->regmap[CS8427_REG_CLOCKSOURCE] &= ~CS8427_RXDMASK;
 340         if (aes3input)
 341                 chip->regmap[CS8427_REG_CLOCKSOURCE] |= CS8427_RXDAES3INPUT;
 342         snd_cs8427_reg_write(cs8427, CS8427_REG_CLOCKSOURCE,
 343                              chip->regmap[CS8427_REG_CLOCKSOURCE]);
 344         snd_i2c_unlock(cs8427->bus);
 345 }
 346
 347 static int snd_cs8427_in_status_info(struct snd_kcontrol *kcontrol,
 348                                      struct snd_ctl_elem_info *uinfo)
 349 {
 350         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 351         uinfo->count = 1;
 352         uinfo->value.integer.min = 0;
 353         uinfo->value.integer.max = 255;
 354         return 0;
 355 }
 356
 357 static int snd_cs8427_in_status_get(struct snd_kcontrol *kcontrol,
 358                                     struct snd_ctl_elem_value *ucontrol)
 359 {
 360         struct snd_i2c_device *device = snd_kcontrol_chip(kcontrol);
 361         int data;
 362
 363         snd_i2c_lock(device->bus);
 364         data = snd_cs8427_reg_read(device, kcontrol->private_value);
 365         snd_i2c_unlock(device->bus);
 366         if (data < 0)
 367                 return data;
 368         ucontrol->value.integer.value[0] = data;
 369         return 0;
 370 }
 371
 372 static int snd_cs8427_qsubcode_info(struct snd_kcontrol *kcontrol,
 373                                     struct snd_ctl_elem_info *uinfo)
 374 {
 375         uinfo->type = SNDRV_CTL_ELEM_TYPE_BYTES;
 376         uinfo->count = 10;
 377         return 0;
 378 }
 379
 380 static int snd_cs8427_qsubcode_get(struct snd_kcontrol *kcontrol,
 381                                    struct snd_ctl_elem_value *ucontrol)
 382 {
 383         struct snd_i2c_device *device = snd_kcontrol_chip(kcontrol);
 384         unsigned char reg = CS8427_REG_QSUBCODE;
 385         int err;
 386
 387         snd_i2c_lock(device->bus);
 388         if ((err = snd_i2c_sendbytes(device, &reg, 1)) != 1) {
 389                 snd_printk(KERN_ERR "unable to send register 0x%x byte "
 390                            "to CS8427\n", reg);
 391                 snd_i2c_unlock(device->bus);
 392                 return err < 0 ? err : -EIO;
 393         }
 394         err = snd_i2c_readbytes(device, ucontrol->value.bytes.data, 10);
 395         if (err != 10) {
 396                 snd_printk(KERN_ERR "unable to read Q-subcode bytes "
 397                            "from CS8427\n");
 398                 snd_i2c_unlock(device->bus);
 399                 return err < 0 ? err : -EIO;
 400         }
 401         snd_i2c_unlock(device->bus);
 402         return 0;
 403 }
 404
 405 static int snd_cs8427_spdif_info(struct snd_kcontrol *kcontrol,
 406                                  struct snd_ctl_elem_info *uinfo)
 407 {
 408         uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
 409         uinfo->count = 1;
 410         return 0;
 411 }
 412
 413 static int snd_cs8427_spdif_get(struct snd_kcontrol *kcontrol,
 414                                 struct snd_ctl_elem_value *ucontrol)
 415 {
 416         struct snd_i2c_device *device = snd_kcontrol_chip(kcontrol);
 417         struct cs8427 *chip = device->private_data;
 418
 419         snd_i2c_lock(device->bus);
 420         memcpy(ucontrol->value.iec958.status, chip->playback.def_status, 24);
 421         snd_i2c_unlock(device->bus);
 422         return 0;
 423 }
 424
 425 static int snd_cs8427_spdif_put(struct snd_kcontrol *kcontrol,
 426                                 struct snd_ctl_elem_value *ucontrol)
 427 {
 428         struct snd_i2c_device *device = snd_kcontrol_chip(kcontrol);
 429         struct cs8427 *chip = device->private_data;
 430         unsigned char *status = kcontrol->private_value ?
 431                 chip->playback.pcm_status : chip->playback.def_status;
 432         struct snd_pcm_runtime *runtime = chip->playback.substream ?
 433                 chip->playback.substream->runtime : NULL;
 434         int err, change;
 435
 436         snd_i2c_lock(device->bus);
 437         change = memcmp(ucontrol->value.iec958.status, status, 24) != 0;
 438         memcpy(status, ucontrol->value.iec958.status, 24);
 439         if (change && (kcontrol->private_value ?
 440                        runtime != NULL : runtime == NULL)) {
 441                 err = snd_cs8427_send_corudata(device, 0, status, 24);
 442                 if (err < 0)
 443                         change = err;
 444         }
 445         snd_i2c_unlock(device->bus);
 446         return change;
 447 }
 448
 449 static int snd_cs8427_spdif_mask_info(struct snd_kcontrol *kcontrol,
 450                                       struct snd_ctl_elem_info *uinfo)
 451 {
 452         uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
 453         uinfo->count = 1;
 454         return 0;
 455 }
 456
 457 static int snd_cs8427_spdif_mask_get(struct snd_kcontrol *kcontrol,
 458                                       struct snd_ctl_elem_value *ucontrol)
 459 {
 460         memset(ucontrol->value.iec958.status, 0xff, 24);
 461         return 0;
 462 }
 463
 464 static struct snd_kcontrol_new snd_cs8427_iec958_controls[] = {
 465 {
 466         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 467         .info =         snd_cs8427_in_status_info,
 468         .name =         "IEC958 CS8427 Input Status",
 469         .access =       (SNDRV_CTL_ELEM_ACCESS_READ |
 470                          SNDRV_CTL_ELEM_ACCESS_VOLATILE),
 471         .get =          snd_cs8427_in_status_get,
 472         .private_value = 15,
 473 },
 474 {
 475         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 476         .info =         snd_cs8427_in_status_info,
 477         .name =         "IEC958 CS8427 Error Status",
 478         .access =       (SNDRV_CTL_ELEM_ACCESS_READ |
 479                          SNDRV_CTL_ELEM_ACCESS_VOLATILE),
 480         .get =          snd_cs8427_in_status_get,
 481         .private_value = 16,
 482 },
 483 {
 484         .access =       SNDRV_CTL_ELEM_ACCESS_READ,
 485         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 486         .name =         SNDRV_CTL_NAME_IEC958("",PLAYBACK,MASK),
 487         .info =         snd_cs8427_spdif_mask_info,
 488         .get =          snd_cs8427_spdif_mask_get,
 489 },
 490 {
 491         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 492         .name =         SNDRV_CTL_NAME_IEC958("",PLAYBACK,DEFAULT),
 493         .info =         snd_cs8427_spdif_info,
 494         .get =          snd_cs8427_spdif_get,
 495         .put =          snd_cs8427_spdif_put,
 496         .private_value = 0
 497 },
 498 {
 499         .access =       (SNDRV_CTL_ELEM_ACCESS_READWRITE |
 500                          SNDRV_CTL_ELEM_ACCESS_INACTIVE),
 501         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 502         .name =         SNDRV_CTL_NAME_IEC958("",PLAYBACK,PCM_STREAM),
 503         .info =         snd_cs8427_spdif_info,
 504         .get =          snd_cs8427_spdif_get,
 505         .put =          snd_cs8427_spdif_put,
 506         .private_value = 1
 507 },
 508 {
 509         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 510         .info =         snd_cs8427_qsubcode_info,
 511         .name =         "IEC958 Q-subcode Capture Default",
 512         .access =       (SNDRV_CTL_ELEM_ACCESS_READ |
 513                          SNDRV_CTL_ELEM_ACCESS_VOLATILE),
 514         .get =          snd_cs8427_qsubcode_get
 515 }};
 516
 517 int snd_cs8427_iec958_build(struct snd_i2c_device *cs8427,
 518                             struct snd_pcm_substream *play_substream,
 519                             struct snd_pcm_substream *cap_substream)
 520 {
 521         struct cs8427 *chip = cs8427->private_data;
 522         struct snd_kcontrol *kctl;
 523         unsigned int idx;
 524         int err;
 525
 526         snd_assert(play_substream && cap_substream, return -EINVAL);
 527         for (idx = 0; idx < ARRAY_SIZE(snd_cs8427_iec958_controls); idx++) {
 528                 kctl = snd_ctl_new1(&snd_cs8427_iec958_controls[idx], cs8427);
 529                 if (kctl == NULL)
 530                         return -ENOMEM;
 531                 kctl->id.device = play_substream->pcm->device;
 532                 kctl->id.subdevice = play_substream->number;
 533                 err = snd_ctl_add(cs8427->bus->card, kctl);
 534                 if (err < 0)
 535                         return err;
 536                 if (! strcmp(kctl->id.name,
 537                              SNDRV_CTL_NAME_IEC958("",PLAYBACK,PCM_STREAM)))
 538                         chip->playback.pcm_ctl = kctl;
 539         }
 540
 541         chip->playback.substream = play_substream;
 542         chip->capture.substream = cap_substream;
 543         snd_assert(chip->playback.pcm_ctl, return -EIO);
 544         return 0;
 545 }
 546
 547 EXPORT_SYMBOL(snd_cs8427_iec958_build);
 548
 549 int snd_cs8427_iec958_active(struct snd_i2c_device *cs8427, int active)
 550 {
 551         struct cs8427 *chip;
 552
 553         snd_assert(cs8427, return -ENXIO);
 554         chip = cs8427->private_data;
 555         if (active)
 556                 memcpy(chip->playback.pcm_status,
 557                        chip->playback.def_status, 24);
 558         chip->playback.pcm_ctl->vd[0].access &= ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
 559         snd_ctl_notify(cs8427->bus->card,
 560                        SNDRV_CTL_EVENT_MASK_VALUE | SNDRV_CTL_EVENT_MASK_INFO,
 561                        &chip->playback.pcm_ctl->id);
 562         return 0;
 563 }
 564
 565 EXPORT_SYMBOL(snd_cs8427_iec958_active);
 566
 567 int snd_cs8427_iec958_pcm(struct snd_i2c_device *cs8427, unsigned int rate)
 568 {
 569         struct cs8427 *chip;
 570         char *status;
 571         int err, reset;
 572
 573         snd_assert(cs8427, return -ENXIO);
 574         chip = cs8427->private_data;
 575         status = chip->playback.pcm_status;
 576         snd_i2c_lock(cs8427->bus);
 577         if (status[0] & IEC958_AES0_PROFESSIONAL) {
 578                 status[0] &= ~IEC958_AES0_PRO_FS;
 579                 switch (rate) {
 580                 case 32000: status[0] |= IEC958_AES0_PRO_FS_32000; break;
 581                 case 44100: status[0] |= IEC958_AES0_PRO_FS_44100; break;
 582                 case 48000: status[0] |= IEC958_AES0_PRO_FS_48000; break;
 583                 default: status[0] |= IEC958_AES0_PRO_FS_NOTID; break;
 584                 }
 585         } else {
 586                 status[3] &= ~IEC958_AES3_CON_FS;
 587                 switch (rate) {
 588                 case 32000: status[3] |= IEC958_AES3_CON_FS_32000; break;
 589                 case 44100: status[3] |= IEC958_AES3_CON_FS_44100; break;
 590                 case 48000: status[3] |= IEC958_AES3_CON_FS_48000; break;
 591                 }
 592         }
 593         err = snd_cs8427_send_corudata(cs8427, 0, status, 24);
 594         if (err > 0)
 595                 snd_ctl_notify(cs8427->bus->card,
 596                                SNDRV_CTL_EVENT_MASK_VALUE,
 597                                &chip->playback.pcm_ctl->id);
 598         reset = chip->rate != rate;
 599         chip->rate = rate;
 600         snd_i2c_unlock(cs8427->bus);
 601         if (reset)
 602                 snd_cs8427_reset(cs8427);
 603         return err < 0 ? err : 0;
 604 }
 605
 606 EXPORT_SYMBOL(snd_cs8427_iec958_pcm);
 607
 608 static int __init alsa_cs8427_module_init(void)
 609 {
 610         return 0;
 611 }
 612
 613 static void __exit alsa_cs8427_module_exit(void)
 614 {
 615 }
 616
 617 module_init(alsa_cs8427_module_init)
 618 module_exit(alsa_cs8427_module_exit)