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