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