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 <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(snd_i2c_device_t *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 typedef struct {
  42         snd_pcm_substream_t *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         snd_kcontrol_t *pcm_ctl;
  48 } cs8427_stream_t;
  49
  50 typedef struct {
  51         unsigned char regmap[0x14];     /* map of first 1 + 13 registers */
  52         unsigned int rate;
  53         unsigned int reset_timeout;
  54         cs8427_stream_t playback;
  55         cs8427_stream_t capture;
  56 } cs8427_t;
  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(snd_i2c_device_t *device, unsigned char reg, unsigned char val)
  71 {
  72         int err;
  73         unsigned char buf[2];
  74
  75         buf[0] = reg & 0x7f;
  76         buf[1] = val;
  77         if ((err = snd_i2c_sendbytes(device, buf, 2)) != 2) {
  78                 snd_printk("unable to send bytes 0x%02x:0x%02x to CS8427 (%i)\n", buf[0], buf[1], err);
  79                 return err < 0 ? err : -EIO;
  80         }
  81         return 0;
  82 }
  83
  84 static int snd_cs8427_reg_read(snd_i2c_device_t *device, unsigned char reg)
  85 {
  86         int err;
  87         unsigned char buf;
  88
  89         if ((err = snd_i2c_sendbytes(device, &reg, 1)) != 1) {
  90                 snd_printk("unable to send register 0x%x byte to CS8427\n", reg);
  91                 return err < 0 ? err : -EIO;
  92         }
  93         if ((err = snd_i2c_readbytes(device, &buf, 1)) != 1) {
  94                 snd_printk("unable to read register 0x%x byte from CS8427\n", reg);
  95                 return err < 0 ? err : -EIO;
  96         }
  97         return buf;
  98 }
  99
 100 static int snd_cs8427_select_corudata(snd_i2c_device_t *device, int udata)
 101 {
 102         cs8427_t *chip = device->private_data;
 103         int err;
 104
 105         udata = udata ? CS8427_BSEL : 0;
 106         if (udata != (chip->regmap[CS8427_REG_CSDATABUF] & udata)) {
 107                 chip->regmap[CS8427_REG_CSDATABUF] &= ~CS8427_BSEL;
 108                 chip->regmap[CS8427_REG_CSDATABUF] |= udata;
 109                 err = snd_cs8427_reg_write(device, CS8427_REG_CSDATABUF, chip->regmap[CS8427_REG_CSDATABUF]);
 110                 if (err < 0)
 111                         return err;
 112         }
 113         return 0;
 114 }
 115
 116 static int snd_cs8427_send_corudata(snd_i2c_device_t *device,
 117                                     int udata,
 118                                     unsigned char *ndata,
 119                                     int count)
 120 {
 121         cs8427_t *chip = device->private_data;
 122         char *hw_data = udata ? chip->playback.hw_udata : chip->playback.hw_status;
 123         char data[32];
 124         int err, idx;
 125
 126         if (!memcmp(hw_data, ndata, count))
 127                 return 0;
 128         if ((err = snd_cs8427_select_corudata(device, udata)) < 0)
 129                 return err;
 130         memcpy(hw_data, ndata, count);
 131         if (udata) {
 132                 memset(data, 0, sizeof(data));
 133                 if (memcmp(hw_data, data, count) == 0) {
 134                         chip->regmap[CS8427_REG_UDATABUF] &= ~CS8427_UBMMASK;
 135                         chip->regmap[CS8427_REG_UDATABUF] |= CS8427_UBMZEROS | CS8427_EFTUI;
 136                         if ((err = snd_cs8427_reg_write(device, CS8427_REG_UDATABUF, chip->regmap[CS8427_REG_UDATABUF])) < 0)
 137                                 return err;
 138                         return 0;
 139                 }
 140         }
 141         data[0] = CS8427_REG_AUTOINC | CS8427_REG_CORU_DATABUF;
 142         for (idx = 0; idx < count; idx++)
 143                 data[idx + 1] = swapbits(ndata[idx]);
 144         if (snd_i2c_sendbytes(device, data, count + 1) != count + 1)
 145                 return -EIO;
 146         return 1;
 147 }
 148
 149 static void snd_cs8427_free(snd_i2c_device_t *device)
 150 {
 151         kfree(device->private_data);
 152 }
 153
 154 int snd_cs8427_create(snd_i2c_bus_t *bus,
 155                       unsigned char addr,
 156                       unsigned int reset_timeout,
 157                       snd_i2c_device_t **r_cs8427)
 158 {
 159         static unsigned char initvals1[] = {
 160           CS8427_REG_CONTROL1 | CS8427_REG_AUTOINC,
 161           /* CS8427_REG_CONTROL1: RMCK to OMCK, valid PCM audio, disable mutes, TCBL=output */
 162           CS8427_SWCLK | CS8427_TCBLDIR,
 163           /* CS8427_REG_CONTROL2: hold last valid audio sample, RMCK=256*Fs, normal stereo operation */
 164           0x00,
 165           /* CS8427_REG_DATAFLOW: output drivers normal operation, Tx<=serial, Rx=>serial */
 166           CS8427_TXDSERIAL | CS8427_SPDAES3RECEIVER,
 167           /* CS8427_REG_CLOCKSOURCE: Run off, CMCK=256*Fs, output time base = OMCK, input time base =
 168              recovered input clock, recovered input clock source is ILRCK changed to AES3INPUT (workaround, see snd_cs8427_reset) */
 169           CS8427_RXDILRCK,
 170           /* CS8427_REG_SERIALINPUT: Serial audio input port data format = I2S, 24-bit, 64*Fsi */
 171           CS8427_SIDEL | CS8427_SILRPOL,
 172           /* CS8427_REG_SERIALOUTPUT: Serial audio output port data format = I2S, 24-bit, 64*Fsi */
 173           CS8427_SODEL | CS8427_SOLRPOL,
 174         };
 175         static unsigned char initvals2[] = {
 176           CS8427_REG_RECVERRMASK | CS8427_REG_AUTOINC,
 177           /* CS8427_REG_RECVERRMASK: unmask the input PLL clock, V, confidence, biphase, parity status bits */
 178           /* CS8427_UNLOCK | CS8427_V | CS8427_CONF | CS8427_BIP | CS8427_PAR, */
 179           0xff, /* set everything */
 180           /* CS8427_REG_CSDATABUF:
 181              Registers 32-55 window to CS buffer
 182              Inhibit D->E transfers from overwriting first 5 bytes of CS data.
 183              Inhibit D->E transfers (all) of CS data.
 184              Allow E->F transfer of CS data.
 185              One byte mode; both A/B channels get same written CB data.
 186              A channel info is output to chip's EMPH* pin. */
 187           CS8427_CBMR | CS8427_DETCI,
 188           /* CS8427_REG_UDATABUF:
 189              Use internal buffer to transmit User (U) data.
 190              Chip's U pin is an output.
 191              Transmit all O's for user data.
 192              Inhibit D->E transfers.
 193              Inhibit E->F transfers. */
 194           CS8427_UD | CS8427_EFTUI | CS8427_DETUI,
 195         };
 196         int err;
 197         cs8427_t *chip;
 198         snd_i2c_device_t *device;
 199         unsigned char buf[24];
 200
 201         if ((err = snd_i2c_device_create(bus, "CS8427", CS8427_ADDR | (addr & 7), &device)) < 0)
 202                 return err;
 203         chip = device->private_data = kcalloc(1, sizeof(*chip), GFP_KERNEL);
 204         if (chip == NULL) {
 205                 snd_i2c_device_free(device);
 206                 return -ENOMEM;
 207         }
 208         device->private_free = snd_cs8427_free;
 209
 210         snd_i2c_lock(bus);
 211         if ((err = snd_cs8427_reg_read(device, CS8427_REG_ID_AND_VER)) != CS8427_VER8427A) {
 212                 snd_i2c_unlock(bus);
 213                 snd_printk("unable to find CS8427 signature (expected 0x%x, read 0x%x), initialization is not completed\n", CS8427_VER8427A, err);
 214                 return -EFAULT;
 215         }
 216         /* turn off run bit while making changes to configuration */
 217         if ((err = snd_cs8427_reg_write(device, CS8427_REG_CLOCKSOURCE, 0x00)) < 0)
 218                 goto __fail;
 219         /* send initial values */
 220         memcpy(chip->regmap + (initvals1[0] & 0x7f), initvals1 + 1, 6);
 221         if ((err = snd_i2c_sendbytes(device, initvals1, 7)) != 7) {
 222                 err = err < 0 ? err : -EIO;
 223                 goto __fail;
 224         }
 225         /* Turn off CS8427 interrupt stuff that is not used in hardware */
 226         memset(buf, 0, 7);
 227         /* from address 9 to 15 */
 228         buf[0] = 9;     /* register */
 229         if ((err = snd_i2c_sendbytes(device, buf, 7)) != 7)
 230                 goto __fail;
 231         /* send transfer initialization sequence */
 232         memcpy(chip->regmap + (initvals2[0] & 0x7f), initvals2 + 1, 3);
 233         if ((err = snd_i2c_sendbytes(device, initvals2, 4)) != 4) {
 234                 err = err < 0 ? err : -EIO;
 235                 goto __fail;
 236         }
 237         /* write default channel status bytes */
 238         buf[0] = ((unsigned char)(SNDRV_PCM_DEFAULT_CON_SPDIF >> 0));
 239         buf[1] = ((unsigned char)(SNDRV_PCM_DEFAULT_CON_SPDIF >> 8));
 240         buf[2] = ((unsigned char)(SNDRV_PCM_DEFAULT_CON_SPDIF >> 16));
 241         buf[3] = ((unsigned char)(SNDRV_PCM_DEFAULT_CON_SPDIF >> 24));
 242         memset(buf + 4, 0, 24 - 4);
 243         if (snd_cs8427_send_corudata(device, 0, buf, 24) < 0)
 244                 goto __fail;
 245         memcpy(chip->playback.def_status, buf, 24);
 246         memcpy(chip->playback.pcm_status, buf, 24);
 247         snd_i2c_unlock(bus);
 248
 249         /* turn on run bit and rock'n'roll */
 250         if (reset_timeout < 1)
 251                 reset_timeout = 1;
 252         chip->reset_timeout = reset_timeout;
 253         snd_cs8427_reset(device);
 254
 255 #if 0   // it's nice for read tests
 256         {
 257         char buf[128];
 258         int xx;
 259         buf[0] = 0x81;
 260         snd_i2c_sendbytes(device, buf, 1);
 261         snd_i2c_readbytes(device, buf, 127);
 262         for (xx = 0; xx < 127; xx++)
 263                 printk("reg[0x%x] = 0x%x\n", xx+1, buf[xx]);
 264         }
 265 #endif
 266
 267         if (r_cs8427)
 268                 *r_cs8427 = device;
 269         return 0;
 270
 271       __fail:
 272         snd_i2c_unlock(bus);
 273         snd_i2c_device_free(device);
 274         return err < 0 ? err : -EIO;
 275 }
 276
 277 /*
 278  * Reset the chip using run bit, also lock PLL using ILRCK and
 279  * put back AES3INPUT. This workaround is described in latest
 280  * CS8427 datasheet, otherwise TXDSERIAL will not work.
 281  */
 282 static void snd_cs8427_reset(snd_i2c_device_t *cs8427)
 283 {
 284         cs8427_t *chip;
 285         unsigned long end_time;
 286         int data;
 287
 288         snd_assert(cs8427, return);
 289         chip = cs8427->private_data;
 290         snd_i2c_lock(cs8427->bus);
 291         chip->regmap[CS8427_REG_CLOCKSOURCE] &= ~(CS8427_RUN | CS8427_RXDMASK);
 292         snd_cs8427_reg_write(cs8427, CS8427_REG_CLOCKSOURCE, chip->regmap[CS8427_REG_CLOCKSOURCE]);
 293         udelay(200);
 294         chip->regmap[CS8427_REG_CLOCKSOURCE] |= CS8427_RUN | CS8427_RXDILRCK;
 295         snd_cs8427_reg_write(cs8427, CS8427_REG_CLOCKSOURCE, chip->regmap[CS8427_REG_CLOCKSOURCE]);
 296         udelay(200);
 297         snd_i2c_unlock(cs8427->bus);
 298         end_time = jiffies + chip->reset_timeout;
 299         while (time_after_eq(end_time, jiffies)) {
 300                 snd_i2c_lock(cs8427->bus);
 301                 data = snd_cs8427_reg_read(cs8427, CS8427_REG_RECVERRORS);
 302                 snd_i2c_unlock(cs8427->bus);
 303                 if (!(data & CS8427_UNLOCK))
 304                         break;
 305                 set_current_state(TASK_UNINTERRUPTIBLE);
 306                 schedule_timeout(1);
 307         }
 308         snd_i2c_lock(cs8427->bus);
 309         chip->regmap[CS8427_REG_CLOCKSOURCE] &= ~CS8427_RXDMASK;
 310         chip->regmap[CS8427_REG_CLOCKSOURCE] |= CS8427_RXDAES3INPUT;
 311         snd_cs8427_reg_write(cs8427, CS8427_REG_CLOCKSOURCE, chip->regmap[CS8427_REG_CLOCKSOURCE]);
 312         snd_i2c_unlock(cs8427->bus);
 313 }
 314
 315 static int snd_cs8427_in_status_info(snd_kcontrol_t *kcontrol,
 316                                      snd_ctl_elem_info_t *uinfo)
 317 {
 318         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 319         uinfo->count = 1;
 320         uinfo->value.integer.min = 0;
 321         uinfo->value.integer.max = 255;
 322         return 0;
 323 }
 324
 325 static int snd_cs8427_in_status_get(snd_kcontrol_t *kcontrol,
 326                                     snd_ctl_elem_value_t *ucontrol)
 327 {
 328         snd_i2c_device_t *device = snd_kcontrol_chip(kcontrol);
 329         int data;
 330
 331         snd_i2c_lock(device->bus);
 332         data = snd_cs8427_reg_read(device, kcontrol->private_value);
 333         snd_i2c_unlock(device->bus);
 334         if (data < 0)
 335                 return data;
 336         ucontrol->value.integer.value[0] = data;
 337         return 0;
 338 }
 339
 340 static int snd_cs8427_qsubcode_info(snd_kcontrol_t *kcontrol,
 341                                     snd_ctl_elem_info_t *uinfo)
 342 {
 343         uinfo->type = SNDRV_CTL_ELEM_TYPE_BYTES;
 344         uinfo->count = 10;
 345         return 0;
 346 }
 347
 348 static int snd_cs8427_qsubcode_get(snd_kcontrol_t *kcontrol,
 349                                    snd_ctl_elem_value_t *ucontrol)
 350 {
 351         snd_i2c_device_t *device = snd_kcontrol_chip(kcontrol);
 352         unsigned char reg = CS8427_REG_QSUBCODE;
 353         int err;
 354
 355         snd_i2c_lock(device->bus);
 356         if ((err = snd_i2c_sendbytes(device, &reg, 1)) != 1) {
 357                 snd_printk("unable to send register 0x%x byte to CS8427\n", reg);
 358                 snd_i2c_unlock(device->bus);
 359                 return err < 0 ? err : -EIO;
 360         }
 361         if ((err = snd_i2c_readbytes(device, ucontrol->value.bytes.data, 10)) != 10) {
 362                 snd_printk("unable to read Q-subcode bytes from CS8427\n");
 363                 snd_i2c_unlock(device->bus);
 364                 return err < 0 ? err : -EIO;
 365         }
 366         snd_i2c_unlock(device->bus);
 367         return 0;
 368 }
 369
 370 static int snd_cs8427_spdif_info(snd_kcontrol_t *kcontrol, snd_ctl_elem_info_t * uinfo)
 371 {
 372         uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
 373         uinfo->count = 1;
 374         return 0;
 375 }
 376
 377 static int snd_cs8427_spdif_get(snd_kcontrol_t * kcontrol,
 378                                 snd_ctl_elem_value_t * ucontrol)
 379 {
 380         snd_i2c_device_t *device = snd_kcontrol_chip(kcontrol);
 381         cs8427_t *chip = device->private_data;
 382
 383         snd_i2c_lock(device->bus);
 384         memcpy(ucontrol->value.iec958.status, chip->playback.def_status, 24);
 385         snd_i2c_unlock(device->bus);
 386         return 0;
 387 }
 388
 389 static int snd_cs8427_spdif_put(snd_kcontrol_t * kcontrol,
 390                                 snd_ctl_elem_value_t * ucontrol)
 391 {
 392         snd_i2c_device_t *device = snd_kcontrol_chip(kcontrol);
 393         cs8427_t *chip = device->private_data;
 394         unsigned char *status = kcontrol->private_value ? chip->playback.pcm_status : chip->playback.def_status;
 395         snd_pcm_runtime_t *runtime = chip->playback.substream ? chip->playback.substream->runtime : NULL;
 396         int err, change;
 397
 398         snd_i2c_lock(device->bus);
 399         change = memcmp(ucontrol->value.iec958.status, status, 24) != 0;
 400         memcpy(status, ucontrol->value.iec958.status, 24);
 401         if (change && (kcontrol->private_value ? runtime != NULL : runtime == NULL)) {
 402                 err = snd_cs8427_send_corudata(device, 0, status, 24);
 403                 if (err < 0)
 404                         change = err;
 405         }
 406         snd_i2c_unlock(device->bus);
 407         return change;
 408 }
 409
 410 static int snd_cs8427_spdif_mask_info(snd_kcontrol_t *kcontrol, snd_ctl_elem_info_t * uinfo)
 411 {
 412         uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
 413         uinfo->count = 1;
 414         return 0;
 415 }
 416
 417 static int snd_cs8427_spdif_mask_get(snd_kcontrol_t * kcontrol,
 418                                       snd_ctl_elem_value_t * ucontrol)
 419 {
 420         memset(ucontrol->value.iec958.status, 0xff, 24);
 421         return 0;
 422 }
 423
 424 static snd_kcontrol_new_t snd_cs8427_iec958_controls[] = {
 425 {
 426         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 427         .info =         snd_cs8427_in_status_info,
 428         .name =         "IEC958 CS8427 Input Status",
 429         .access =       SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
 430         .get =          snd_cs8427_in_status_get,
 431         .private_value = 15,
 432 },
 433 {
 434         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 435         .info =         snd_cs8427_in_status_info,
 436         .name =         "IEC958 CS8427 Error Status",
 437         .access =       SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
 438         .get =          snd_cs8427_in_status_get,
 439         .private_value = 16,
 440 },
 441 {
 442         .access =       SNDRV_CTL_ELEM_ACCESS_READ,
 443         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 444         .name =         SNDRV_CTL_NAME_IEC958("",PLAYBACK,MASK),
 445         .info =         snd_cs8427_spdif_mask_info,
 446         .get =          snd_cs8427_spdif_mask_get,
 447 },
 448 {
 449         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 450         .name =         SNDRV_CTL_NAME_IEC958("",PLAYBACK,DEFAULT),
 451         .info =         snd_cs8427_spdif_info,
 452         .get =          snd_cs8427_spdif_get,
 453         .put =          snd_cs8427_spdif_put,
 454         .private_value = 0
 455 },
 456 {
 457         .access =       SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_INACTIVE,
 458         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 459         .name =         SNDRV_CTL_NAME_IEC958("",PLAYBACK,PCM_STREAM),
 460         .info =         snd_cs8427_spdif_info,
 461         .get =          snd_cs8427_spdif_get,
 462         .put =          snd_cs8427_spdif_put,
 463         .private_value = 1
 464 },
 465 {
 466         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 467         .info =         snd_cs8427_qsubcode_info,
 468         .name =         "IEC958 Q-subcode Capture Default",
 469         .access =       SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
 470         .get =          snd_cs8427_qsubcode_get
 471 }};
 472
 473 int snd_cs8427_iec958_build(snd_i2c_device_t *cs8427,
 474                             snd_pcm_substream_t *play_substream,
 475                             snd_pcm_substream_t *cap_substream)
 476 {
 477         cs8427_t *chip = cs8427->private_data;
 478         snd_kcontrol_t *kctl;
 479         unsigned int idx;
 480         int err;
 481
 482         snd_assert(play_substream && cap_substream, return -EINVAL);
 483         for (idx = 0; idx < ARRAY_SIZE(snd_cs8427_iec958_controls); idx++) {
 484                 kctl = snd_ctl_new1(&snd_cs8427_iec958_controls[idx], cs8427);
 485                 if (kctl == NULL)
 486                         return -ENOMEM;
 487                 kctl->id.device = play_substream->pcm->device;
 488                 kctl->id.subdevice = play_substream->number;
 489                 err = snd_ctl_add(cs8427->bus->card, kctl);
 490                 if (err < 0)
 491                         return err;
 492                 if (!strcmp(kctl->id.name, SNDRV_CTL_NAME_IEC958("",PLAYBACK,PCM_STREAM)))
 493                         chip->playback.pcm_ctl = kctl;
 494         }
 495
 496         chip->playback.substream = play_substream;
 497         chip->capture.substream = cap_substream;
 498         snd_assert(chip->playback.pcm_ctl, return -EIO);
 499         return 0;
 500 }
 501
 502 int snd_cs8427_iec958_active(snd_i2c_device_t *cs8427, int active)
 503 {
 504         cs8427_t *chip;
 505
 506         snd_assert(cs8427, return -ENXIO);
 507         chip = cs8427->private_data;
 508         if (active)
 509                 memcpy(chip->playback.pcm_status, chip->playback.def_status, 24);
 510         chip->playback.pcm_ctl->vd[0].access &= ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
 511         snd_ctl_notify(cs8427->bus->card, SNDRV_CTL_EVENT_MASK_VALUE |
 512                                           SNDRV_CTL_EVENT_MASK_INFO, &chip->playback.pcm_ctl->id);
 513         return 0;
 514 }
 515
 516 int snd_cs8427_iec958_pcm(snd_i2c_device_t *cs8427, unsigned int rate)
 517 {
 518         cs8427_t *chip;
 519         char *status;
 520         int err, reset;
 521
 522         snd_assert(cs8427, return -ENXIO);
 523         chip = cs8427->private_data;
 524         status = chip->playback.pcm_status;
 525         snd_i2c_lock(cs8427->bus);
 526         if (status[0] & IEC958_AES0_PROFESSIONAL) {
 527                 status[0] &= ~IEC958_AES0_PRO_FS;
 528                 switch (rate) {
 529                 case 32000: status[0] |= IEC958_AES0_PRO_FS_32000; break;
 530                 case 44100: status[0] |= IEC958_AES0_PRO_FS_44100; break;
 531                 case 48000: status[0] |= IEC958_AES0_PRO_FS_48000; break;
 532                 default: status[0] |= IEC958_AES0_PRO_FS_NOTID; break;
 533                 }
 534         } else {
 535                 status[3] &= ~IEC958_AES3_CON_FS;
 536                 switch (rate) {
 537                 case 32000: status[3] |= IEC958_AES3_CON_FS_32000; break;
 538                 case 44100: status[3] |= IEC958_AES3_CON_FS_44100; break;
 539                 case 48000: status[3] |= IEC958_AES3_CON_FS_48000; break;
 540                 }
 541         }
 542         err = snd_cs8427_send_corudata(cs8427, 0, status, 24);
 543         if (err > 0)
 544                 snd_ctl_notify(cs8427->bus->card,
 545                                SNDRV_CTL_EVENT_MASK_VALUE,
 546                                &chip->playback.pcm_ctl->id);
 547         reset = chip->rate != rate;
 548         chip->rate = rate;
 549         snd_i2c_unlock(cs8427->bus);
 550         if (reset)
 551                 snd_cs8427_reset(cs8427);
 552         return err < 0 ? err : 0;
 553 }
 554
 555 static int __init alsa_cs8427_module_init(void)
 556 {
 557         return 0;
 558 }
 559
 560 static void __exit alsa_cs8427_module_exit(void)
 561 {
 562 }
 563
 564 module_init(alsa_cs8427_module_init)
 565 module_exit(alsa_cs8427_module_exit)
 566
 567 EXPORT_SYMBOL(snd_cs8427_create);
 568 EXPORT_SYMBOL(snd_cs8427_reset);
 569 EXPORT_SYMBOL(snd_cs8427_reg_write);
 570 EXPORT_SYMBOL(snd_cs8427_iec958_build);
 571 EXPORT_SYMBOL(snd_cs8427_iec958_active);
 572 EXPORT_SYMBOL(snd_cs8427_iec958_pcm);