sound/i2c/cs8427.c

   1 /*
   2  *  Routines for control of the CS8427 via i2c bus
   3  *  IEC958 (S/PDIF) receiver & transmitter by Cirrus Logic
   4  *  Copyright (c) by Jaroslav Kysela <perex@suse.cz>
   5  *
   6  *
   7  *   This program is free software; you can redistribute it and/or modify
   8  *   it under the terms of the GNU General Public License as published by
   9  *   the Free Software Foundation; either version 2 of the License, or
  10  *   (at your option) any later version.
  11  *
  12  *   This program is distributed in the hope that it will be useful,
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *   GNU General Public License for more details.
  16  *
  17  *   You should have received a copy of the GNU General Public License
  18  *   along with this program; if not, write to the Free Software
  19  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  20  *
  21  */
  22
  23 #include <sound/driver.h>
  24 #include <linux/slab.h>
  25 #include <linux/delay.h>
  26 #include <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 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>");
  33 MODULE_DESCRIPTION("IEC958 (S/PDIF) receiver & transmitter by Cirrus Logic");
  34 MODULE_LICENSE("GPL");
  35
  36 #define chip_t snd_i2c_device_t
  37
  38 #define CS8427_ADDR                     (0x20>>1) /* fixed address */
  39
  40 typedef struct {
  41         snd_pcm_substream_t *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         snd_kcontrol_t *pcm_ctl;
  47 } cs8427_stream_t;
  48
  49 typedef struct {
  50         unsigned char regmap[0x14];     /* map of first 1 + 13 registers */
  51         unsigned int rate;
  52         cs8427_stream_t playback;
  53         cs8427_stream_t capture;
  54 } cs8427_t;
  55
  56 static unsigned char swapbits(unsigned char val)
  57 {
  58         int bit;
  59         unsigned char res = 0;
  60         for (bit = 0; bit < 8; bit++) {
  61                 res <<= 1;
  62                 res |= val & 1;
  63                 val >>= 1;
  64         }
  65         return res;
  66 }
  67
  68 int snd_cs8427_detect(snd_i2c_bus_t *bus, unsigned char addr)
  69 {
  70         int res;
  71
  72         snd_i2c_lock(bus);
  73         res = snd_i2c_probeaddr(bus, CS8427_ADDR | (addr & 7));
  74         snd_i2c_unlock(bus);
  75         return res;
  76 }
  77
  78 int snd_cs8427_reg_write(snd_i2c_device_t *device, unsigned char reg, unsigned char val)
  79 {
  80         int err;
  81         unsigned char buf[2];
  82
  83         buf[0] = reg & 0x7f;
  84         buf[1] = val;
  85         if ((err = snd_i2c_sendbytes(device, buf, 2)) != 2) {
  86                 snd_printk("unable to send bytes 0x%02x:0x%02x to CS8427 (%i)\n", buf[0], buf[1], err);
  87                 return err < 0 ? err : -EIO;
  88         }
  89         return 0;
  90 }
  91
  92 int snd_cs8427_reg_read(snd_i2c_device_t *device, unsigned char reg)
  93 {
  94         int err;
  95         unsigned char buf;
  96
  97         if ((err = snd_i2c_sendbytes(device, &reg, 1)) != 1) {
  98                 snd_printk("unable to send register 0x%x byte to CS8427\n", reg);
  99                 return err < 0 ? err : -EIO;
 100         }
 101         if ((err = snd_i2c_readbytes(device, &buf, 1)) != 1) {
 102                 snd_printk("unable to read register 0x%x byte from CS8427\n", reg);
 103                 return err < 0 ? err : -EIO;
 104         }
 105         return buf;
 106 }
 107
 108 static int snd_cs8427_select_corudata(snd_i2c_device_t *device, int udata)
 109 {
 110         cs8427_t *chip = snd_magic_cast(cs8427_t, device->private_data, return -ENXIO);
 111         int err;
 112
 113         udata = udata ? CS8427_BSEL : 0;
 114         if (udata != (chip->regmap[CS8427_REG_CSDATABUF] & udata)) {
 115                 chip->regmap[CS8427_REG_CSDATABUF] &= ~CS8427_BSEL;
 116                 chip->regmap[CS8427_REG_CSDATABUF] |= udata;
 117                 err = snd_cs8427_reg_write(device, CS8427_REG_CSDATABUF, chip->regmap[CS8427_REG_CSDATABUF]);
 118                 if (err < 0)
 119                         return err;
 120         }
 121         return 0;
 122 }
 123
 124 static int snd_cs8427_send_corudata(snd_i2c_device_t *device,
 125                                     int udata,
 126                                     unsigned char *ndata,
 127                                     int count)
 128 {
 129         cs8427_t *chip = snd_magic_cast(cs8427_t, device->private_data, return -ENXIO);
 130         char *hw_data = udata ? chip->playback.hw_udata : chip->playback.hw_status;
 131         char data[32];
 132         int err, idx;
 133
 134         if (!memcmp(hw_data, ndata, count))
 135                 return 0;
 136         if ((err = snd_cs8427_select_corudata(device, udata)) < 0)
 137                 return err;
 138         memcpy(hw_data, ndata, count);
 139         if (udata) {
 140                 memset(data, 0, sizeof(data));
 141                 if (memcmp(hw_data, data, count) == 0) {
 142                         chip->regmap[CS8427_REG_UDATABUF] &= ~CS8427_UBMMASK;
 143                         chip->regmap[CS8427_REG_UDATABUF] |= CS8427_UBMZEROS | CS8427_EFTUI;
 144                         if ((err = snd_cs8427_reg_write(device, CS8427_REG_UDATABUF, chip->regmap[CS8427_REG_UDATABUF])) < 0)
 145                                 return err;
 146                         return 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(snd_i2c_device_t *device)
 158 {
 159         if (device->private_data)
 160                 snd_magic_kfree(device->private_data);
 161 }
 162
 163 int snd_cs8427_create(snd_i2c_bus_t *bus,
 164                       unsigned char addr,
 165                       snd_i2c_device_t **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, TCBL=output */
 170           CS8427_SWCLK | CS8427_TCBLDIR,
 171           /* CS8427_REG_CONTROL2: hold last valid audio sample, RMCK=256*Fs, normal stereo operation */
 172           0x00,
 173           /* CS8427_REG_DATAFLOW: output drivers normal operation, Tx<=serial, Rx=>serial */
 174           CS8427_TXDSERIAL | CS8427_SPDAES3RECEIVER,
 175           /* CS8427_REG_CLOCKSOURCE: Run off, CMCK=256*Fs, output time base = OMCK, input time base =
 176              recovered input clock, recovered input clock source is ILRCK changed to AES3INPUT (workaround, see snd_cs8427_reset) */
 177           CS8427_RXDILRCK,
 178           /* CS8427_REG_SERIALINPUT: Serial audio input port data format = I2S, 24-bit, 64*Fsi */
 179           CS8427_SIDEL | CS8427_SILRPOL,
 180           /* CS8427_REG_SERIALOUTPUT: Serial audio output port data format = I2S, 24-bit, 64*Fsi */
 181           CS8427_SODEL | CS8427_SOLRPOL,
 182         };
 183         static unsigned char initvals2[] = {
 184           CS8427_REG_RECVERRMASK | CS8427_REG_AUTOINC,
 185           /* CS8427_REG_RECVERRMASK: unmask the input PLL clock, V, confidence, biphase, parity status bits */
 186           /* CS8427_UNLOCK | CS8427_V | CS8427_CONF | CS8427_BIP | CS8427_PAR, */
 187           0xff, /* set everything */
 188           /* CS8427_REG_CSDATABUF:
 189              Registers 32-55 window to CS buffer
 190              Inhibit D->E transfers from overwriting first 5 bytes of CS data.
 191              Inhibit D->E transfers (all) of CS data.
 192              Allow E->F transfer of CS data.
 193              One byte mode; both A/B channels get same written CB data.
 194              A channel info is output to chip's EMPH* pin. */
 195           CS8427_CBMR | CS8427_DETCI,
 196           /* CS8427_REG_UDATABUF:
 197              Use internal buffer to transmit User (U) data.
 198              Chip's U pin is an output.
 199              Transmit all O's for user data.
 200              Inhibit D->E transfers.
 201              Inhibit E->F transfers. */
 202           CS8427_UD | CS8427_EFTUI | CS8427_DETUI,
 203         };
 204         int err;
 205         cs8427_t *chip;
 206         snd_i2c_device_t *device;
 207         unsigned char buf[24];
 208
 209         if ((err = snd_i2c_device_create(bus, "CS8427", CS8427_ADDR | (addr & 7), &device)) < 0)
 210                 return err;
 211         chip = device->private_data = snd_magic_kcalloc(cs8427_t, 0, GFP_KERNEL);
 212         if (chip == NULL) {
 213                 snd_i2c_device_free(device);
 214                 return -ENOMEM;
 215         }
 216         device->private_free = snd_cs8427_free;
 217
 218         snd_i2c_lock(bus);
 219         if ((err = snd_cs8427_reg_read(device, CS8427_REG_ID_AND_VER)) != CS8427_VER8427A) {
 220                 snd_i2c_unlock(bus);
 221                 snd_printk("unable to find CS8427 signature (expected 0x%x, read 0x%x), initialization is not completed\n", CS8427_VER8427A, err);
 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         snd_cs8427_reset(device);
 259
 260 #if 0   // it's nice for read tests
 261         {
 262         char buf[128];
 263         int xx;
 264         buf[0] = 0x81;
 265         snd_i2c_sendbytes(device, buf, 1);
 266         snd_i2c_readbytes(device, buf, 127);
 267         for (xx = 0; xx < 127; xx++)
 268                 printk("reg[0x%x] = 0x%x\n", xx+1, buf[xx]);
 269         }
 270 #endif
 271
 272         if (r_cs8427)
 273                 *r_cs8427 = device;
 274         return 0;
 275
 276       __fail:
 277         snd_i2c_unlock(bus);
 278         snd_i2c_device_free(device);
 279         return err < 0 ? err : -EIO;
 280 }
 281
 282 /*
 283  * Reset the chip using run bit, also lock PLL using ILRCK and
 284  * put back AES3INPUT. This workaround is described in latest
 285  * CS8427 datasheet, otherwise TXDSERIAL will not work.
 286  */
 287 void snd_cs8427_reset(snd_i2c_device_t *cs8427)
 288 {
 289         cs8427_t *chip;
 290         unsigned long end_time;
 291         int data;
 292
 293         snd_assert(cs8427, return);
 294         chip = snd_magic_cast(cs8427_t, cs8427->private_data, return);
 295         snd_i2c_lock(cs8427->bus);
 296         chip->regmap[CS8427_REG_CLOCKSOURCE] &= ~(CS8427_RUN | CS8427_RXDMASK);
 297         snd_cs8427_reg_write(cs8427, CS8427_REG_CLOCKSOURCE, chip->regmap[CS8427_REG_CLOCKSOURCE]);
 298         udelay(200);
 299         chip->regmap[CS8427_REG_CLOCKSOURCE] |= CS8427_RUN | CS8427_RXDILRCK;
 300         snd_cs8427_reg_write(cs8427, CS8427_REG_CLOCKSOURCE, chip->regmap[CS8427_REG_CLOCKSOURCE]);
 301         udelay(200);
 302         snd_i2c_unlock(cs8427->bus);
 303         end_time = jiffies + HZ / 2;
 304         while (time_after_eq(end_time, jiffies)) {
 305                 snd_i2c_lock(cs8427->bus);
 306                 data = snd_cs8427_reg_read(cs8427, CS8427_REG_RECVERRORS);
 307                 snd_i2c_unlock(cs8427->bus);
 308                 if (!(data & CS8427_UNLOCK))
 309                         break;
 310                 set_current_state(TASK_UNINTERRUPTIBLE);
 311                 schedule_timeout(HZ/100);
 312         }
 313         snd_i2c_lock(cs8427->bus);
 314         chip->regmap[CS8427_REG_CLOCKSOURCE] &= ~CS8427_RXDMASK;
 315         chip->regmap[CS8427_REG_CLOCKSOURCE] |= CS8427_RXDAES3INPUT;
 316         snd_cs8427_reg_write(cs8427, CS8427_REG_CLOCKSOURCE, chip->regmap[CS8427_REG_CLOCKSOURCE]);
 317         snd_i2c_unlock(cs8427->bus);
 318 }
 319
 320 static int snd_cs8427_in_status_info(snd_kcontrol_t *kcontrol,
 321                                      snd_ctl_elem_info_t *uinfo)
 322 {
 323         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 324         uinfo->count = 1;
 325         uinfo->value.integer.min = 0;
 326         uinfo->value.integer.max = 255;
 327         return 0;
 328 }
 329
 330 static int snd_cs8427_in_status_get(snd_kcontrol_t *kcontrol,
 331                                     snd_ctl_elem_value_t *ucontrol)
 332 {
 333         snd_i2c_device_t *device = snd_kcontrol_chip(kcontrol);
 334         int data;
 335
 336         snd_i2c_lock(device->bus);
 337         data = snd_cs8427_reg_read(device, kcontrol->private_value);
 338         snd_i2c_unlock(device->bus);
 339         if (data < 0)
 340                 return data;
 341         ucontrol->value.integer.value[0] = data;
 342         return 0;
 343 }
 344
 345 static int snd_cs8427_qsubcode_info(snd_kcontrol_t *kcontrol,
 346                                     snd_ctl_elem_info_t *uinfo)
 347 {
 348         uinfo->type = SNDRV_CTL_ELEM_TYPE_BYTES;
 349         uinfo->count = 10;
 350         return 0;
 351 }
 352
 353 static int snd_cs8427_qsubcode_get(snd_kcontrol_t *kcontrol,
 354                                    snd_ctl_elem_value_t *ucontrol)
 355 {
 356         snd_i2c_device_t *device = snd_kcontrol_chip(kcontrol);
 357         unsigned char reg = CS8427_REG_QSUBCODE;
 358         int err;
 359
 360         snd_i2c_lock(device->bus);
 361         if ((err = snd_i2c_sendbytes(device, &reg, 1)) != 1) {
 362                 snd_printk("unable to send register 0x%x byte to CS8427\n", reg);
 363                 snd_i2c_unlock(device->bus);
 364                 return err < 0 ? err : -EIO;
 365         }
 366         if ((err = snd_i2c_readbytes(device, ucontrol->value.bytes.data, 10)) != 10) {
 367                 snd_printk("unable to read Q-subcode bytes from CS8427\n");
 368                 snd_i2c_unlock(device->bus);
 369                 return err < 0 ? err : -EIO;
 370         }
 371         snd_i2c_unlock(device->bus);
 372         return 0;
 373 }
 374
 375 static int snd_cs8427_spdif_info(snd_kcontrol_t *kcontrol, snd_ctl_elem_info_t * uinfo)
 376 {
 377         uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
 378         uinfo->count = 1;
 379         return 0;
 380 }
 381
 382 static int snd_cs8427_spdif_get(snd_kcontrol_t * kcontrol,
 383                                 snd_ctl_elem_value_t * ucontrol)
 384 {
 385         snd_i2c_device_t *device = snd_kcontrol_chip(kcontrol);
 386         cs8427_t *chip = snd_magic_cast(cs8427_t, device->private_data, return -ENXIO);
 387
 388         snd_i2c_lock(device->bus);
 389         memcpy(ucontrol->value.iec958.status, chip->playback.def_status, 24);
 390         snd_i2c_unlock(device->bus);
 391         return 0;
 392 }
 393
 394 static int snd_cs8427_spdif_put(snd_kcontrol_t * kcontrol,
 395                                 snd_ctl_elem_value_t * ucontrol)
 396 {
 397         snd_i2c_device_t *device = snd_kcontrol_chip(kcontrol);
 398         cs8427_t *chip = snd_magic_cast(cs8427_t, device->private_data, return -ENXIO);
 399         unsigned char *status = kcontrol->private_value ? chip->playback.pcm_status : chip->playback.def_status;
 400         snd_pcm_runtime_t *runtime = chip->playback.substream ? chip->playback.substream->runtime : NULL;
 401         int err, change;
 402
 403         snd_i2c_lock(device->bus);
 404         change = memcmp(ucontrol->value.iec958.status, status, 24) != 0;
 405         memcpy(status, ucontrol->value.iec958.status, 24);
 406         if (change && (kcontrol->private_value ? runtime != NULL : runtime == NULL)) {
 407                 err = snd_cs8427_send_corudata(device, 0, status, 24);
 408                 if (err < 0)
 409                         change = err;
 410         }
 411         snd_i2c_unlock(device->bus);
 412         return change;
 413 }
 414
 415 static int snd_cs8427_spdif_mask_info(snd_kcontrol_t *kcontrol, snd_ctl_elem_info_t * uinfo)
 416 {
 417         uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
 418         uinfo->count = 1;
 419         return 0;
 420 }
 421
 422 static int snd_cs8427_spdif_mask_get(snd_kcontrol_t * kcontrol,
 423                                       snd_ctl_elem_value_t * ucontrol)
 424 {
 425         memset(ucontrol->value.iec958.status, 0xff, 24);
 426         return 0;
 427 }
 428
 429 #define CONTROLS (sizeof(snd_cs8427_iec958_controls)/sizeof(snd_kcontrol_new_t))
 430
 431 static snd_kcontrol_new_t snd_cs8427_iec958_controls[] = {
 432 {
 433         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 434         .info =         snd_cs8427_in_status_info,
 435         .name =         "IEC958 CS8427 Input Status",
 436         .access =       SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
 437         .get =          snd_cs8427_in_status_get,
 438         .private_value = 15,
 439 },
 440 {
 441         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 442         .info =         snd_cs8427_in_status_info,
 443         .name =         "IEC958 CS8427 Error Status",
 444         .access =       SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
 445         .get =          snd_cs8427_in_status_get,
 446         .private_value = 16,
 447 },
 448 {
 449         .access =       SNDRV_CTL_ELEM_ACCESS_READ,
 450         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 451         .name =         SNDRV_CTL_NAME_IEC958("",PLAYBACK,MASK),
 452         .info =         snd_cs8427_spdif_mask_info,
 453         .get =          snd_cs8427_spdif_mask_get,
 454 },
 455 {
 456         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 457         .name =         SNDRV_CTL_NAME_IEC958("",PLAYBACK,DEFAULT),
 458         .info =         snd_cs8427_spdif_info,
 459         .get =          snd_cs8427_spdif_get,
 460         .put =          snd_cs8427_spdif_put,
 461         .private_value = 0
 462 },
 463 {
 464         .access =       SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_INACTIVE,
 465         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 466         .name =         SNDRV_CTL_NAME_IEC958("",PLAYBACK,PCM_STREAM),
 467         .info =         snd_cs8427_spdif_info,
 468         .get =          snd_cs8427_spdif_get,
 469         .put =          snd_cs8427_spdif_put,
 470         .private_value = 1
 471 },
 472 {
 473         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 474         .info =         snd_cs8427_qsubcode_info,
 475         .name =         "IEC958 Q-subcode Capture Default",
 476         .access =       SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
 477         .get =          snd_cs8427_qsubcode_get
 478 }};
 479
 480 int snd_cs8427_iec958_build(snd_i2c_device_t *cs8427,
 481                             snd_pcm_substream_t *play_substream,
 482                             snd_pcm_substream_t *cap_substream)
 483 {
 484         cs8427_t *chip = snd_magic_cast(cs8427_t, cs8427->private_data, return -ENXIO);
 485         snd_kcontrol_t *kctl;
 486         unsigned int idx;
 487         int err;
 488
 489         snd_assert(play_substream && cap_substream, return -EINVAL);
 490         for (idx = 0; idx < CONTROLS; idx++) {
 491                 kctl = snd_ctl_new1(&snd_cs8427_iec958_controls[idx], cs8427);
 492                 if (kctl == NULL)
 493                         return -ENOMEM;
 494                 kctl->id.device = play_substream->pcm->device;
 495                 kctl->id.subdevice = play_substream->number;
 496                 err = snd_ctl_add(cs8427->bus->card, kctl);
 497                 if (err < 0)
 498                         return err;
 499                 if (!strcmp(kctl->id.name, SNDRV_CTL_NAME_IEC958("",PLAYBACK,PCM_STREAM)))
 500                         chip->playback.pcm_ctl = kctl;
 501         }
 502
 503         chip->playback.substream = play_substream;
 504         chip->capture.substream = cap_substream;
 505         snd_assert(chip->playback.pcm_ctl, return -EIO);
 506         return 0;
 507 }
 508
 509 int snd_cs8427_iec958_active(snd_i2c_device_t *cs8427, int active)
 510 {
 511         cs8427_t *chip;
 512
 513         snd_assert(cs8427, return -ENXIO);
 514         chip = snd_magic_cast(cs8427_t, cs8427->private_data, return -ENXIO);
 515         if (active)
 516                 memcpy(chip->playback.pcm_status, chip->playback.def_status, 24);
 517         chip->playback.pcm_ctl->vd[0].access &= ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
 518         snd_ctl_notify(cs8427->bus->card, SNDRV_CTL_EVENT_MASK_VALUE |
 519                                           SNDRV_CTL_EVENT_MASK_INFO, &chip->playback.pcm_ctl->id);
 520         return 0;
 521 }
 522
 523 int snd_cs8427_iec958_pcm(snd_i2c_device_t *cs8427, unsigned int rate)
 524 {
 525         cs8427_t *chip;
 526         char *status;
 527         int err, reset;
 528
 529         snd_assert(cs8427, return -ENXIO);
 530         chip = snd_magic_cast(cs8427_t, cs8427->private_data, return -ENXIO);
 531         status = chip->playback.pcm_status;
 532         snd_i2c_lock(cs8427->bus);
 533         if (status[0] & IEC958_AES0_PROFESSIONAL) {
 534                 status[0] &= ~IEC958_AES0_PRO_FS;
 535                 switch (rate) {
 536                 case 32000: status[0] |= IEC958_AES0_PRO_FS_32000; break;
 537                 case 44100: status[0] |= IEC958_AES0_PRO_FS_44100; break;
 538                 case 48000: status[0] |= IEC958_AES0_PRO_FS_48000; break;
 539                 default: status[0] |= IEC958_AES0_PRO_FS_NOTID; break;
 540                 }
 541         } else {
 542                 status[3] &= ~IEC958_AES3_CON_FS;
 543                 switch (rate) {
 544                 case 32000: status[3] |= IEC958_AES3_CON_FS_32000; break;
 545                 case 44100: status[3] |= IEC958_AES3_CON_FS_44100; break;
 546                 case 48000: status[3] |= IEC958_AES3_CON_FS_48000; break;
 547                 }
 548         }
 549         err = snd_cs8427_send_corudata(cs8427, 0, status, 24);
 550         if (err > 0)
 551                 snd_ctl_notify(cs8427->bus->card,
 552                                SNDRV_CTL_EVENT_MASK_VALUE,
 553                                &chip->playback.pcm_ctl->id);
 554         reset = chip->rate != rate;
 555         snd_i2c_unlock(cs8427->bus);
 556         if (reset)
 557                 snd_cs8427_reset(cs8427);
 558         return err < 0 ? err : 0;
 559 }
 560
 561 EXPORT_SYMBOL(snd_cs8427_detect);
 562 EXPORT_SYMBOL(snd_cs8427_create);
 563 EXPORT_SYMBOL(snd_cs8427_reset);
 564 EXPORT_SYMBOL(snd_cs8427_reg_write);
 565 EXPORT_SYMBOL(snd_cs8427_reg_read);
 566 EXPORT_SYMBOL(snd_cs8427_iec958_build);
 567 EXPORT_SYMBOL(snd_cs8427_iec958_active);
 568 EXPORT_SYMBOL(snd_cs8427_iec958_pcm);