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@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 <sound/core.h>
  27 #include <sound/control.h>
  28 #include <sound/pcm.h>
  29 #include <sound/cs8427.h>
  30 #include <sound/asoundef.h>
  31
  32 static void snd_cs8427_reset(struct snd_i2c_device *cs8427);
  33
  34 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
  35 MODULE_DESCRIPTION("IEC958 (S/PDIF) receiver & transmitter by Cirrus Logic");
  36 MODULE_LICENSE("GPL");
  37
  38 #define CS8427_ADDR                     (0x20>>1) /* fixed address */
  39
  40 struct cs8427_stream {
  41         struct snd_pcm_substream *substream;
  42         char hw_status[24];             /* hardware status */
  43         char def_status[24];            /* default status */
  44         char pcm_status[24];            /* PCM private status */
  45         char hw_udata[32];
  46         struct snd_kcontrol *pcm_ctl;
  47 };
  48
  49 struct cs8427 {
  50         unsigned char regmap[0x14];     /* map of first 1 + 13 registers */
  51         unsigned int rate;
  52         unsigned int reset_timeout;
  53         struct cs8427_stream playback;
  54         struct cs8427_stream capture;
  55 };
  56
  57 static unsigned char swapbits(unsigned char val)
  58 {
  59         int bit;
  60         unsigned char res = 0;
  61         for (bit = 0; bit < 8; bit++) {
  62                 res <<= 1;
  63                 res |= val & 1;
  64                 val >>= 1;
  65         }
  66         return res;
  67 }
  68
  69 int snd_cs8427_reg_write(struct snd_i2c_device *device, unsigned char reg,
  70                          unsigned char val)
  71 {
  72         int err;
  73         unsigned char buf[2];
  74
  75         buf[0] = reg & 0x7f;
  76         buf[1] = val;
  77         if ((err = snd_i2c_sendbytes(device, buf, 2)) != 2) {
  78                 snd_printk(KERN_ERR "unable to send bytes 0x%02x:0x%02x "
  79                            "to CS8427 (%i)\n", buf[0], buf[1], err);
  80                 return err < 0 ? err : -EIO;
  81         }
  82         return 0;
  83 }
  84
  85 EXPORT_SYMBOL(snd_cs8427_reg_write);
  86
  87 static int snd_cs8427_reg_read(struct snd_i2c_device *device, unsigned char reg)
  88 {
  89         int err;
  90         unsigned char buf;
  91
  92         if ((err = snd_i2c_sendbytes(device, &reg, 1)) != 1) {
  93                 snd_printk(KERN_ERR "unable to send register 0x%x byte "
  94                            "to CS8427\n", reg);
  95                 return err < 0 ? err : -EIO;
  96         }
  97         if ((err = snd_i2c_readbytes(device, &buf, 1)) != 1) {
  98                 snd_printk(KERN_ERR "unable to read register 0x%x byte "
  99                            "from CS8427\n", reg);
 100                 return err < 0 ? err : -EIO;
 101         }
 102         return buf;
 103 }
 104
 105 static int snd_cs8427_select_corudata(struct snd_i2c_device *device, int udata)
 106 {
 107         struct cs8427 *chip = device->private_data;
 108         int err;
 109
 110         udata = udata ? CS8427_BSEL : 0;
 111         if (udata != (chip->regmap[CS8427_REG_CSDATABUF] & udata)) {
 112                 chip->regmap[CS8427_REG_CSDATABUF] &= ~CS8427_BSEL;
 113                 chip->regmap[CS8427_REG_CSDATABUF] |= udata;
 114                 err = snd_cs8427_reg_write(device, CS8427_REG_CSDATABUF,
 115                                            chip->regmap[CS8427_REG_CSDATABUF]);
 116                 if (err < 0)
 117                         return err;
 118         }
 119         return 0;
 120 }
 121
 122 static int snd_cs8427_send_corudata(struct snd_i2c_device *device,
 123                                     int udata,
 124                                     unsigned char *ndata,
 125                                     int count)
 126 {
 127         struct cs8427 *chip = device->private_data;
 128         char *hw_data = udata ?
 129                 chip->playback.hw_udata : chip->playback.hw_status;
 130         char data[32];
 131         int err, idx;
 132
 133         if (!memcmp(hw_data, ndata, count))
 134                 return 0;
 135         if ((err = snd_cs8427_select_corudata(device, udata)) < 0)
 136                 return err;
 137         memcpy(hw_data, ndata, count);
 138         if (udata) {
 139                 memset(data, 0, sizeof(data));
 140                 if (memcmp(hw_data, data, count) == 0) {
 141                         chip->regmap[CS8427_REG_UDATABUF] &= ~CS8427_UBMMASK;
 142                         chip->regmap[CS8427_REG_UDATABUF] |= CS8427_UBMZEROS |
 143                                 CS8427_EFTUI;
 144                         err = snd_cs8427_reg_write(device, CS8427_REG_UDATABUF,
 145                                                    chip->regmap[CS8427_REG_UDATABUF]);
 146                         return err < 0 ? err : 0;
 147                 }
 148         }
 149         data[0] = CS8427_REG_AUTOINC | CS8427_REG_CORU_DATABUF;
 150         for (idx = 0; idx < count; idx++)
 151                 data[idx + 1] = swapbits(ndata[idx]);
 152         if (snd_i2c_sendbytes(device, data, count + 1) != count + 1)
 153                 return -EIO;
 154         return 1;
 155 }
 156
 157 static void snd_cs8427_free(struct snd_i2c_device *device)
 158 {
 159         kfree(device->private_data);
 160 }
 161
 162 int snd_cs8427_create(struct snd_i2c_bus *bus,
 163                       unsigned char addr,
 164                       unsigned int reset_timeout,
 165                       struct snd_i2c_device **r_cs8427)
 166 {
 167         static unsigned char initvals1[] = {
 168           CS8427_REG_CONTROL1 | CS8427_REG_AUTOINC,
 169           /* CS8427_REG_CONTROL1: RMCK to OMCK, valid PCM audio, disable mutes,
 170              TCBL=output */
 171           CS8427_SWCLK | CS8427_TCBLDIR,
 172           /* CS8427_REG_CONTROL2: hold last valid audio sample, RMCK=256*Fs,
 173              normal stereo operation */
 174           0x00,
 175           /* CS8427_REG_DATAFLOW: output drivers normal operation, Tx<=serial,
 176              Rx=>serial */
 177           CS8427_TXDSERIAL | CS8427_SPDAES3RECEIVER,
 178           /* CS8427_REG_CLOCKSOURCE: Run off, CMCK=256*Fs,
 179              output time base = OMCK, input time base = recovered input clock,
 180              recovered input clock source is ILRCK changed to AES3INPUT
 181              (workaround, see snd_cs8427_reset) */
 182           CS8427_RXDILRCK,
 183           /* CS8427_REG_SERIALINPUT: Serial audio input port data format = I2S,
 184              24-bit, 64*Fsi */
 185           CS8427_SIDEL | CS8427_SILRPOL,
 186           /* CS8427_REG_SERIALOUTPUT: Serial audio output port data format
 187              = I2S, 24-bit, 64*Fsi */
 188           CS8427_SODEL | CS8427_SOLRPOL,
 189         };
 190         static unsigned char initvals2[] = {
 191           CS8427_REG_RECVERRMASK | CS8427_REG_AUTOINC,
 192           /* CS8427_REG_RECVERRMASK: unmask the input PLL clock, V, confidence,
 193              biphase, parity status bits */
 194           /* CS8427_UNLOCK | CS8427_V | CS8427_CONF | CS8427_BIP | CS8427_PAR,*/
 195           0xff, /* set everything */
 196           /* CS8427_REG_CSDATABUF:
 197              Registers 32-55 window to CS buffer
 198              Inhibit D->E transfers from overwriting first 5 bytes of CS data.
 199              Inhibit D->E transfers (all) of CS data.
 200              Allow E->F transfer of CS data.
 201              One byte mode; both A/B channels get same written CB data.
 202              A channel info is output to chip's EMPH* pin. */
 203           CS8427_CBMR | CS8427_DETCI,
 204           /* CS8427_REG_UDATABUF:
 205              Use internal buffer to transmit User (U) data.
 206              Chip's U pin is an output.
 207              Transmit all O's for user data.
 208              Inhibit D->E transfers.
 209              Inhibit E->F transfers. */
 210           CS8427_UD | CS8427_EFTUI | CS8427_DETUI,
 211         };
 212         int err;
 213         struct cs8427 *chip;
 214         struct snd_i2c_device *device;
 215         unsigned char buf[24];
 216
 217         if ((err = snd_i2c_device_create(bus, "CS8427",
 218                                          CS8427_ADDR | (addr & 7),
 219                                          &device)) < 0)
 220                 return err;
 221         chip = device->private_data = kzalloc(sizeof(*chip), GFP_KERNEL);
 222         if (chip == NULL) {
 223                 snd_i2c_device_free(device);
 224                 return -ENOMEM;
 225         }
 226         device->private_free = snd_cs8427_free;
 227
 228         snd_i2c_lock(bus);
 229         err = snd_cs8427_reg_read(device, CS8427_REG_ID_AND_VER);
 230         if (err != CS8427_VER8427A) {
 231                 /* give second chance */
 232                 snd_printk(KERN_WARNING "invalid CS8427 signature 0x%x: "
 233                            "let me try again...\n", err);
 234                 err = snd_cs8427_reg_read(device, CS8427_REG_ID_AND_VER);
 235         }
 236         if (err != CS8427_VER8427A) {
 237                 snd_i2c_unlock(bus);
 238                 snd_printk(KERN_ERR "unable to find CS8427 signature "
 239                            "(expected 0x%x, read 0x%x),\n",
 240                            CS8427_VER8427A, err);
 241                 snd_printk(KERN_ERR "   initialization is not completed\n");
 242                 return -EFAULT;
 243         }
 244         /* turn off run bit while making changes to configuration */
 245         err = snd_cs8427_reg_write(device, CS8427_REG_CLOCKSOURCE, 0x00);
 246         if (err < 0)
 247                 goto __fail;
 248         /* send initial values */
 249         memcpy(chip->regmap + (initvals1[0] & 0x7f), initvals1 + 1, 6);
 250         if ((err = snd_i2c_sendbytes(device, initvals1, 7)) != 7) {
 251                 err = err < 0 ? err : -EIO;
 252                 goto __fail;
 253         }
 254         /* Turn off CS8427 interrupt stuff that is not used in hardware */
 255         memset(buf, 0, 7);
 256         /* from address 9 to 15 */
 257         buf[0] = 9;     /* register */
 258         if ((err = snd_i2c_sendbytes(device, buf, 7)) != 7)
 259                 goto __fail;
 260         /* send transfer initialization sequence */
 261         memcpy(chip->regmap + (initvals2[0] & 0x7f), initvals2 + 1, 3);
 262         if ((err = snd_i2c_sendbytes(device, initvals2, 4)) != 4) {
 263                 err = err < 0 ? err : -EIO;
 264                 goto __fail;
 265         }
 266         /* write default channel status bytes */
 267         buf[0] = ((unsigned char)(SNDRV_PCM_DEFAULT_CON_SPDIF >> 0));
 268         buf[1] = ((unsigned char)(SNDRV_PCM_DEFAULT_CON_SPDIF >> 8));
 269         buf[2] = ((unsigned char)(SNDRV_PCM_DEFAULT_CON_SPDIF >> 16));
 270         buf[3] = ((unsigned char)(SNDRV_PCM_DEFAULT_CON_SPDIF >> 24));
 271         memset(buf + 4, 0, 24 - 4);
 272         if (snd_cs8427_send_corudata(device, 0, buf, 24) < 0)
 273                 goto __fail;
 274         memcpy(chip->playback.def_status, buf, 24);
 275         memcpy(chip->playback.pcm_status, buf, 24);
 276         snd_i2c_unlock(bus);
 277
 278         /* turn on run bit and rock'n'roll */
 279         if (reset_timeout < 1)
 280                 reset_timeout = 1;
 281         chip->reset_timeout = reset_timeout;
 282         snd_cs8427_reset(device);
 283
 284 #if 0   // it's nice for read tests
 285         {
 286         char buf[128];
 287         int xx;
 288         buf[0] = 0x81;
 289         snd_i2c_sendbytes(device, buf, 1);
 290         snd_i2c_readbytes(device, buf, 127);
 291         for (xx = 0; xx < 127; xx++)
 292                 printk(KERN_DEBUG "reg[0x%x] = 0x%x\n", xx+1, buf[xx]);
 293         }
 294 #endif
 295
 296         if (r_cs8427)
 297                 *r_cs8427 = device;
 298         return 0;
 299
 300       __fail:
 301         snd_i2c_unlock(bus);
 302         snd_i2c_device_free(device);
 303         return err < 0 ? err : -EIO;
 304 }
 305
 306 EXPORT_SYMBOL(snd_cs8427_create);
 307
 308 /*
 309  * Reset the chip using run bit, also lock PLL using ILRCK and
 310  * put back AES3INPUT. This workaround is described in latest
 311  * CS8427 datasheet, otherwise TXDSERIAL will not work.
 312  */
 313 static void snd_cs8427_reset(struct snd_i2c_device *cs8427)
 314 {
 315         struct cs8427 *chip;
 316         unsigned long end_time;
 317         int data, aes3input = 0;
 318
 319         snd_assert(cs8427, return);
 320         chip = cs8427->private_data;
 321         snd_i2c_lock(cs8427->bus);
 322         if ((chip->regmap[CS8427_REG_CLOCKSOURCE] & CS8427_RXDAES3INPUT) ==
 323             CS8427_RXDAES3INPUT)  /* AES3 bit is set */
 324                 aes3input = 1;
 325         chip->regmap[CS8427_REG_CLOCKSOURCE] &= ~(CS8427_RUN | CS8427_RXDMASK);
 326         snd_cs8427_reg_write(cs8427, CS8427_REG_CLOCKSOURCE,
 327                              chip->regmap[CS8427_REG_CLOCKSOURCE]);
 328         udelay(200);
 329         chip->regmap[CS8427_REG_CLOCKSOURCE] |= CS8427_RUN | CS8427_RXDILRCK;
 330         snd_cs8427_reg_write(cs8427, CS8427_REG_CLOCKSOURCE,
 331                              chip->regmap[CS8427_REG_CLOCKSOURCE]);
 332         udelay(200);
 333         snd_i2c_unlock(cs8427->bus);
 334         end_time = jiffies + chip->reset_timeout;
 335         while (time_after_eq(end_time, jiffies)) {
 336                 snd_i2c_lock(cs8427->bus);
 337                 data = snd_cs8427_reg_read(cs8427, CS8427_REG_RECVERRORS);
 338                 snd_i2c_unlock(cs8427->bus);
 339                 if (!(data & CS8427_UNLOCK))
 340                         break;
 341                 schedule_timeout_uninterruptible(1);
 342         }
 343         snd_i2c_lock(cs8427->bus);
 344         chip->regmap[CS8427_REG_CLOCKSOURCE] &= ~CS8427_RXDMASK;
 345         if (aes3input)
 346                 chip->regmap[CS8427_REG_CLOCKSOURCE] |= CS8427_RXDAES3INPUT;
 347         snd_cs8427_reg_write(cs8427, CS8427_REG_CLOCKSOURCE,
 348                              chip->regmap[CS8427_REG_CLOCKSOURCE]);
 349         snd_i2c_unlock(cs8427->bus);
 350 }
 351
 352 static int snd_cs8427_in_status_info(struct snd_kcontrol *kcontrol,
 353                                      struct snd_ctl_elem_info *uinfo)
 354 {
 355         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 356         uinfo->count = 1;
 357         uinfo->value.integer.min = 0;
 358         uinfo->value.integer.max = 255;
 359         return 0;
 360 }
 361
 362 static int snd_cs8427_in_status_get(struct snd_kcontrol *kcontrol,
 363                                     struct snd_ctl_elem_value *ucontrol)
 364 {
 365         struct snd_i2c_device *device = snd_kcontrol_chip(kcontrol);
 366         int data;
 367
 368         snd_i2c_lock(device->bus);
 369         data = snd_cs8427_reg_read(device, kcontrol->private_value);
 370         snd_i2c_unlock(device->bus);
 371         if (data < 0)
 372                 return data;
 373         ucontrol->value.integer.value[0] = data;
 374         return 0;
 375 }
 376
 377 static int snd_cs8427_qsubcode_info(struct snd_kcontrol *kcontrol,
 378                                     struct snd_ctl_elem_info *uinfo)
 379 {
 380         uinfo->type = SNDRV_CTL_ELEM_TYPE_BYTES;
 381         uinfo->count = 10;
 382         return 0;
 383 }
 384
 385 static int snd_cs8427_qsubcode_get(struct snd_kcontrol *kcontrol,
 386                                    struct snd_ctl_elem_value *ucontrol)
 387 {
 388         struct snd_i2c_device *device = snd_kcontrol_chip(kcontrol);
 389         unsigned char reg = CS8427_REG_QSUBCODE;
 390         int err;
 391
 392         snd_i2c_lock(device->bus);
 393         if ((err = snd_i2c_sendbytes(device, &reg, 1)) != 1) {
 394                 snd_printk(KERN_ERR "unable to send register 0x%x byte "
 395                            "to CS8427\n", reg);
 396                 snd_i2c_unlock(device->bus);
 397                 return err < 0 ? err : -EIO;
 398         }
 399         err = snd_i2c_readbytes(device, ucontrol->value.bytes.data, 10);
 400         if (err != 10) {
 401                 snd_printk(KERN_ERR "unable to read Q-subcode bytes "
 402                            "from CS8427\n");
 403                 snd_i2c_unlock(device->bus);
 404                 return err < 0 ? err : -EIO;
 405         }
 406         snd_i2c_unlock(device->bus);
 407         return 0;
 408 }
 409
 410 static int snd_cs8427_spdif_info(struct snd_kcontrol *kcontrol,
 411                                  struct snd_ctl_elem_info *uinfo)
 412 {
 413         uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
 414         uinfo->count = 1;
 415         return 0;
 416 }
 417
 418 static int snd_cs8427_spdif_get(struct snd_kcontrol *kcontrol,
 419                                 struct snd_ctl_elem_value *ucontrol)
 420 {
 421         struct snd_i2c_device *device = snd_kcontrol_chip(kcontrol);
 422         struct cs8427 *chip = device->private_data;
 423
 424         snd_i2c_lock(device->bus);
 425         memcpy(ucontrol->value.iec958.status, chip->playback.def_status, 24);
 426         snd_i2c_unlock(device->bus);
 427         return 0;
 428 }
 429
 430 static int snd_cs8427_spdif_put(struct snd_kcontrol *kcontrol,
 431                                 struct snd_ctl_elem_value *ucontrol)
 432 {
 433         struct snd_i2c_device *device = snd_kcontrol_chip(kcontrol);
 434         struct cs8427 *chip = device->private_data;
 435         unsigned char *status = kcontrol->private_value ?
 436                 chip->playback.pcm_status : chip->playback.def_status;
 437         struct snd_pcm_runtime *runtime = chip->playback.substream ?
 438                 chip->playback.substream->runtime : NULL;
 439         int err, change;
 440
 441         snd_i2c_lock(device->bus);
 442         change = memcmp(ucontrol->value.iec958.status, status, 24) != 0;
 443         memcpy(status, ucontrol->value.iec958.status, 24);
 444         if (change && (kcontrol->private_value ?
 445                        runtime != NULL : runtime == NULL)) {
 446                 err = snd_cs8427_send_corudata(device, 0, status, 24);
 447                 if (err < 0)
 448                         change = err;
 449         }
 450         snd_i2c_unlock(device->bus);
 451         return change;
 452 }
 453
 454 static int snd_cs8427_spdif_mask_info(struct snd_kcontrol *kcontrol,
 455                                       struct snd_ctl_elem_info *uinfo)
 456 {
 457         uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
 458         uinfo->count = 1;
 459         return 0;
 460 }
 461
 462 static int snd_cs8427_spdif_mask_get(struct snd_kcontrol *kcontrol,
 463                                       struct snd_ctl_elem_value *ucontrol)
 464 {
 465         memset(ucontrol->value.iec958.status, 0xff, 24);
 466         return 0;
 467 }
 468
 469 static struct snd_kcontrol_new snd_cs8427_iec958_controls[] = {
 470 {
 471         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 472         .info =         snd_cs8427_in_status_info,
 473         .name =         "IEC958 CS8427 Input Status",
 474         .access =       (SNDRV_CTL_ELEM_ACCESS_READ |
 475                          SNDRV_CTL_ELEM_ACCESS_VOLATILE),
 476         .get =          snd_cs8427_in_status_get,
 477         .private_value = 15,
 478 },
 479 {
 480         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 481         .info =         snd_cs8427_in_status_info,
 482         .name =         "IEC958 CS8427 Error Status",
 483         .access =       (SNDRV_CTL_ELEM_ACCESS_READ |
 484                          SNDRV_CTL_ELEM_ACCESS_VOLATILE),
 485         .get =          snd_cs8427_in_status_get,
 486         .private_value = 16,
 487 },
 488 {
 489         .access =       SNDRV_CTL_ELEM_ACCESS_READ,
 490         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 491         .name =         SNDRV_CTL_NAME_IEC958("",PLAYBACK,MASK),
 492         .info =         snd_cs8427_spdif_mask_info,
 493         .get =          snd_cs8427_spdif_mask_get,
 494 },
 495 {
 496         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 497         .name =         SNDRV_CTL_NAME_IEC958("",PLAYBACK,DEFAULT),
 498         .info =         snd_cs8427_spdif_info,
 499         .get =          snd_cs8427_spdif_get,
 500         .put =          snd_cs8427_spdif_put,
 501         .private_value = 0
 502 },
 503 {
 504         .access =       (SNDRV_CTL_ELEM_ACCESS_READWRITE |
 505                          SNDRV_CTL_ELEM_ACCESS_INACTIVE),
 506         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 507         .name =         SNDRV_CTL_NAME_IEC958("",PLAYBACK,PCM_STREAM),
 508         .info =         snd_cs8427_spdif_info,
 509         .get =          snd_cs8427_spdif_get,
 510         .put =          snd_cs8427_spdif_put,
 511         .private_value = 1
 512 },
 513 {
 514         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 515         .info =         snd_cs8427_qsubcode_info,
 516         .name =         "IEC958 Q-subcode Capture Default",
 517         .access =       (SNDRV_CTL_ELEM_ACCESS_READ |
 518                          SNDRV_CTL_ELEM_ACCESS_VOLATILE),
 519         .get =          snd_cs8427_qsubcode_get
 520 }};
 521
 522 int snd_cs8427_iec958_build(struct snd_i2c_device *cs8427,
 523                             struct snd_pcm_substream *play_substream,
 524                             struct snd_pcm_substream *cap_substream)
 525 {
 526         struct cs8427 *chip = cs8427->private_data;
 527         struct snd_kcontrol *kctl;
 528         unsigned int idx;
 529         int err;
 530
 531         snd_assert(play_substream && cap_substream, return -EINVAL);
 532         for (idx = 0; idx < ARRAY_SIZE(snd_cs8427_iec958_controls); idx++) {
 533                 kctl = snd_ctl_new1(&snd_cs8427_iec958_controls[idx], cs8427);
 534                 if (kctl == NULL)
 535                         return -ENOMEM;
 536                 kctl->id.device = play_substream->pcm->device;
 537                 kctl->id.subdevice = play_substream->number;
 538                 err = snd_ctl_add(cs8427->bus->card, kctl);
 539                 if (err < 0)
 540                         return err;
 541                 if (! strcmp(kctl->id.name,
 542                              SNDRV_CTL_NAME_IEC958("",PLAYBACK,PCM_STREAM)))
 543                         chip->playback.pcm_ctl = kctl;
 544         }
 545
 546         chip->playback.substream = play_substream;
 547         chip->capture.substream = cap_substream;
 548         snd_assert(chip->playback.pcm_ctl, return -EIO);
 549         return 0;
 550 }
 551
 552 EXPORT_SYMBOL(snd_cs8427_iec958_build);
 553
 554 int snd_cs8427_iec958_active(struct snd_i2c_device *cs8427, int active)
 555 {
 556         struct cs8427 *chip;
 557
 558         snd_assert(cs8427, return -ENXIO);
 559         chip = cs8427->private_data;
 560         if (active)
 561                 memcpy(chip->playback.pcm_status,
 562                        chip->playback.def_status, 24);
 563         chip->playback.pcm_ctl->vd[0].access &= ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
 564         snd_ctl_notify(cs8427->bus->card,
 565                        SNDRV_CTL_EVENT_MASK_VALUE | SNDRV_CTL_EVENT_MASK_INFO,
 566                        &chip->playback.pcm_ctl->id);
 567         return 0;
 568 }
 569
 570 EXPORT_SYMBOL(snd_cs8427_iec958_active);
 571
 572 int snd_cs8427_iec958_pcm(struct snd_i2c_device *cs8427, unsigned int rate)
 573 {
 574         struct cs8427 *chip;
 575         char *status;
 576         int err, reset;
 577
 578         snd_assert(cs8427, return -ENXIO);
 579         chip = cs8427->private_data;
 580         status = chip->playback.pcm_status;
 581         snd_i2c_lock(cs8427->bus);
 582         if (status[0] & IEC958_AES0_PROFESSIONAL) {
 583                 status[0] &= ~IEC958_AES0_PRO_FS;
 584                 switch (rate) {
 585                 case 32000: status[0] |= IEC958_AES0_PRO_FS_32000; break;
 586                 case 44100: status[0] |= IEC958_AES0_PRO_FS_44100; break;
 587                 case 48000: status[0] |= IEC958_AES0_PRO_FS_48000; break;
 588                 default: status[0] |= IEC958_AES0_PRO_FS_NOTID; break;
 589                 }
 590         } else {
 591                 status[3] &= ~IEC958_AES3_CON_FS;
 592                 switch (rate) {
 593                 case 32000: status[3] |= IEC958_AES3_CON_FS_32000; break;
 594                 case 44100: status[3] |= IEC958_AES3_CON_FS_44100; break;
 595                 case 48000: status[3] |= IEC958_AES3_CON_FS_48000; break;
 596                 }
 597         }
 598         err = snd_cs8427_send_corudata(cs8427, 0, status, 24);
 599         if (err > 0)
 600                 snd_ctl_notify(cs8427->bus->card,
 601                                SNDRV_CTL_EVENT_MASK_VALUE,
 602                                &chip->playback.pcm_ctl->id);
 603         reset = chip->rate != rate;
 604         chip->rate = rate;
 605         snd_i2c_unlock(cs8427->bus);
 606         if (reset)
 607                 snd_cs8427_reset(cs8427);
 608         return err < 0 ? err : 0;
 609 }
 610
 611 EXPORT_SYMBOL(snd_cs8427_iec958_pcm);
 612
 613 static int __init alsa_cs8427_module_init(void)
 614 {
 615         return 0;
 616 }
 617
 618 static void __exit alsa_cs8427_module_exit(void)
 619 {
 620 }
 621
 622 module_init(alsa_cs8427_module_init)
 623 module_exit(alsa_cs8427_module_exit)