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