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 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>");
  34 MODULE_DESCRIPTION("IEC958 (S/PDIF) receiver & transmitter by Cirrus Logic");
  35 MODULE_LICENSE("GPL");
  36
  37 #define chip_t snd_i2c_device_t
  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_detect(snd_i2c_bus_t *bus, unsigned char addr)
  71 {
  72         int res;
  73
  74         snd_i2c_lock(bus);
  75         res = snd_i2c_probeaddr(bus, CS8427_ADDR | (addr & 7));
  76         snd_i2c_unlock(bus);
  77         return res;
  78 }
  79
  80 int snd_cs8427_reg_write(snd_i2c_device_t *device, unsigned char reg, unsigned char val)
  81 {
  82         int err;
  83         unsigned char buf[2];
  84
  85         buf[0] = reg & 0x7f;
  86         buf[1] = val;
  87         if ((err = snd_i2c_sendbytes(device, buf, 2)) != 2) {
  88                 snd_printk("unable to send bytes 0x%02x:0x%02x to CS8427 (%i)\n", buf[0], buf[1], err);
  89                 return err < 0 ? err : -EIO;
  90         }
  91         return 0;
  92 }
  93
  94 int snd_cs8427_reg_read(snd_i2c_device_t *device, unsigned char reg)
  95 {
  96         int err;
  97         unsigned char buf;
  98
  99         if ((err = snd_i2c_sendbytes(device, &reg, 1)) != 1) {
 100                 snd_printk("unable to send register 0x%x byte to CS8427\n", reg);
 101                 return err < 0 ? err : -EIO;
 102         }
 103         if ((err = snd_i2c_readbytes(device, &buf, 1)) != 1) {
 104                 snd_printk("unable to read register 0x%x byte from CS8427\n", reg);
 105                 return err < 0 ? err : -EIO;
 106         }
 107         return buf;
 108 }
 109
 110 static int snd_cs8427_select_corudata(snd_i2c_device_t *device, int udata)
 111 {
 112         cs8427_t *chip = snd_magic_cast(cs8427_t, device->private_data, return -ENXIO);
 113         int err;
 114
 115         udata = udata ? CS8427_BSEL : 0;
 116         if (udata != (chip->regmap[CS8427_REG_CSDATABUF] & udata)) {
 117                 chip->regmap[CS8427_REG_CSDATABUF] &= ~CS8427_BSEL;
 118                 chip->regmap[CS8427_REG_CSDATABUF] |= udata;
 119                 err = snd_cs8427_reg_write(device, CS8427_REG_CSDATABUF, chip->regmap[CS8427_REG_CSDATABUF]);
 120                 if (err < 0)
 121                         return err;
 122         }
 123         return 0;
 124 }
 125
 126 static int snd_cs8427_send_corudata(snd_i2c_device_t *device,
 127                                     int udata,
 128                                     unsigned char *ndata,
 129                                     int count)
 130 {
 131         cs8427_t *chip = snd_magic_cast(cs8427_t, device->private_data, return -ENXIO);
 132         char *hw_data = udata ? chip->playback.hw_udata : chip->playback.hw_status;
 133         char data[32];
 134         int err, idx;
 135
 136         if (!memcmp(hw_data, ndata, count))
 137                 return 0;
 138         if ((err = snd_cs8427_select_corudata(device, udata)) < 0)
 139                 return err;
 140         memcpy(hw_data, ndata, count);
 141         if (udata) {
 142                 memset(data, 0, sizeof(data));
 143                 if (memcmp(hw_data, data, count) == 0) {
 144                         chip->regmap[CS8427_REG_UDATABUF] &= ~CS8427_UBMMASK;
 145                         chip->regmap[CS8427_REG_UDATABUF] |= CS8427_UBMZEROS | CS8427_EFTUI;
 146                         if ((err = snd_cs8427_reg_write(device, CS8427_REG_UDATABUF, chip->regmap[CS8427_REG_UDATABUF])) < 0)
 147                                 return err;
 148                         return 0;
 149                 }
 150         }
 151         data[0] = CS8427_REG_AUTOINC | CS8427_REG_CORU_DATABUF;
 152         for (idx = 0; idx < count; idx++)
 153                 data[idx + 1] = swapbits(ndata[idx]);
 154         if (snd_i2c_sendbytes(device, data, count + 1) != count + 1)
 155                 return -EIO;
 156         return 1;
 157 }
 158
 159 static void snd_cs8427_free(snd_i2c_device_t *device)
 160 {
 161         if (device->private_data)
 162                 snd_magic_kfree(device->private_data);
 163 }
 164
 165 int snd_cs8427_create(snd_i2c_bus_t *bus,
 166                       unsigned char addr,
 167                       unsigned int reset_timeout,
 168                       snd_i2c_device_t **r_cs8427)
 169 {
 170         static unsigned char initvals1[] = {
 171           CS8427_REG_CONTROL1 | CS8427_REG_AUTOINC,
 172           /* CS8427_REG_CONTROL1: RMCK to OMCK, valid PCM audio, disable mutes, TCBL=output */
 173           CS8427_SWCLK | CS8427_TCBLDIR,
 174           /* CS8427_REG_CONTROL2: hold last valid audio sample, RMCK=256*Fs, normal stereo operation */
 175           0x00,
 176           /* CS8427_REG_DATAFLOW: output drivers normal operation, Tx<=serial, Rx=>serial */
 177           CS8427_TXDSERIAL | CS8427_SPDAES3RECEIVER,
 178           /* CS8427_REG_CLOCKSOURCE: Run off, CMCK=256*Fs, output time base = OMCK, input time base =
 179              recovered input clock, recovered input clock source is ILRCK changed to AES3INPUT (workaround, see snd_cs8427_reset) */
 180           CS8427_RXDILRCK,
 181           /* CS8427_REG_SERIALINPUT: Serial audio input port data format = I2S, 24-bit, 64*Fsi */
 182           CS8427_SIDEL | CS8427_SILRPOL,
 183           /* CS8427_REG_SERIALOUTPUT: Serial audio output port data format = I2S, 24-bit, 64*Fsi */
 184           CS8427_SODEL | CS8427_SOLRPOL,
 185         };
 186         static unsigned char initvals2[] = {
 187           CS8427_REG_RECVERRMASK | CS8427_REG_AUTOINC,
 188           /* CS8427_REG_RECVERRMASK: unmask the input PLL clock, V, confidence, biphase, parity status bits */
 189           /* CS8427_UNLOCK | CS8427_V | CS8427_CONF | CS8427_BIP | CS8427_PAR, */
 190           0xff, /* set everything */
 191           /* CS8427_REG_CSDATABUF:
 192              Registers 32-55 window to CS buffer
 193              Inhibit D->E transfers from overwriting first 5 bytes of CS data.
 194              Inhibit D->E transfers (all) of CS data.
 195              Allow E->F transfer of CS data.
 196              One byte mode; both A/B channels get same written CB data.
 197              A channel info is output to chip's EMPH* pin. */
 198           CS8427_CBMR | CS8427_DETCI,
 199           /* CS8427_REG_UDATABUF:
 200              Use internal buffer to transmit User (U) data.
 201              Chip's U pin is an output.
 202              Transmit all O's for user data.
 203              Inhibit D->E transfers.
 204              Inhibit E->F transfers. */
 205           CS8427_UD | CS8427_EFTUI | CS8427_DETUI,
 206         };
 207         int err;
 208         cs8427_t *chip;
 209         snd_i2c_device_t *device;
 210         unsigned char buf[24];
 211
 212         if ((err = snd_i2c_device_create(bus, "CS8427", CS8427_ADDR | (addr & 7), &device)) < 0)
 213                 return err;
 214         chip = device->private_data = snd_magic_kcalloc(cs8427_t, 0, GFP_KERNEL);
 215         if (chip == NULL) {
 216                 snd_i2c_device_free(device);
 217                 return -ENOMEM;
 218         }
 219         device->private_free = snd_cs8427_free;
 220
 221         snd_i2c_lock(bus);
 222         if ((err = snd_cs8427_reg_read(device, CS8427_REG_ID_AND_VER)) != CS8427_VER8427A) {
 223                 snd_i2c_unlock(bus);
 224                 snd_printk("unable to find CS8427 signature (expected 0x%x, read 0x%x), initialization is not completed\n", CS8427_VER8427A, err);
 225                 return -EFAULT;
 226         }
 227         /* turn off run bit while making changes to configuration */
 228         if ((err = snd_cs8427_reg_write(device, CS8427_REG_CLOCKSOURCE, 0x00)) < 0)
 229                 goto __fail;
 230         /* send initial values */
 231         memcpy(chip->regmap + (initvals1[0] & 0x7f), initvals1 + 1, 6);
 232         if ((err = snd_i2c_sendbytes(device, initvals1, 7)) != 7) {
 233                 err = err < 0 ? err : -EIO;
 234                 goto __fail;
 235         }
 236         /* Turn off CS8427 interrupt stuff that is not used in hardware */
 237         memset(buf, 0, 7);
 238         /* from address 9 to 15 */
 239         buf[0] = 9;     /* register */
 240         if ((err = snd_i2c_sendbytes(device, buf, 7)) != 7)
 241                 goto __fail;
 242         /* send transfer initialization sequence */
 243         memcpy(chip->regmap + (initvals2[0] & 0x7f), initvals2 + 1, 3);
 244         if ((err = snd_i2c_sendbytes(device, initvals2, 4)) != 4) {
 245                 err = err < 0 ? err : -EIO;
 246                 goto __fail;
 247         }
 248         /* write default channel status bytes */
 249         buf[0] = ((unsigned char)(SNDRV_PCM_DEFAULT_CON_SPDIF >> 0));
 250         buf[1] = ((unsigned char)(SNDRV_PCM_DEFAULT_CON_SPDIF >> 8));
 251         buf[2] = ((unsigned char)(SNDRV_PCM_DEFAULT_CON_SPDIF >> 16));
 252         buf[3] = ((unsigned char)(SNDRV_PCM_DEFAULT_CON_SPDIF >> 24));
 253         memset(buf + 4, 0, 24 - 4);
 254         if (snd_cs8427_send_corudata(device, 0, buf, 24) < 0)
 255                 goto __fail;
 256         memcpy(chip->playback.def_status, buf, 24);
 257         memcpy(chip->playback.pcm_status, buf, 24);
 258         snd_i2c_unlock(bus);
 259
 260         /* turn on run bit and rock'n'roll */
 261         if (reset_timeout < 1)
 262                 reset_timeout = 1;
 263         chip->reset_timeout = reset_timeout;
 264         snd_cs8427_reset(device);
 265
 266 #if 0   // it's nice for read tests
 267         {
 268         char buf[128];
 269         int xx;
 270         buf[0] = 0x81;
 271         snd_i2c_sendbytes(device, buf, 1);
 272         snd_i2c_readbytes(device, buf, 127);
 273         for (xx = 0; xx < 127; xx++)
 274                 printk("reg[0x%x] = 0x%x\n", xx+1, buf[xx]);
 275         }
 276 #endif
 277
 278         if (r_cs8427)
 279                 *r_cs8427 = device;
 280         return 0;
 281
 282       __fail:
 283         snd_i2c_unlock(bus);
 284         snd_i2c_device_free(device);
 285         return err < 0 ? err : -EIO;
 286 }
 287
 288 /*
 289  * Reset the chip using run bit, also lock PLL using ILRCK and
 290  * put back AES3INPUT. This workaround is described in latest
 291  * CS8427 datasheet, otherwise TXDSERIAL will not work.
 292  */
 293 void snd_cs8427_reset(snd_i2c_device_t *cs8427)
 294 {
 295         cs8427_t *chip;
 296         unsigned long end_time;
 297         int data;
 298
 299         snd_assert(cs8427, return);
 300         chip = snd_magic_cast(cs8427_t, cs8427->private_data, return);
 301         snd_i2c_lock(cs8427->bus);
 302         chip->regmap[CS8427_REG_CLOCKSOURCE] &= ~(CS8427_RUN | CS8427_RXDMASK);
 303         snd_cs8427_reg_write(cs8427, CS8427_REG_CLOCKSOURCE, chip->regmap[CS8427_REG_CLOCKSOURCE]);
 304         udelay(200);
 305         chip->regmap[CS8427_REG_CLOCKSOURCE] |= CS8427_RUN | CS8427_RXDILRCK;
 306         snd_cs8427_reg_write(cs8427, CS8427_REG_CLOCKSOURCE, chip->regmap[CS8427_REG_CLOCKSOURCE]);
 307         udelay(200);
 308         snd_i2c_unlock(cs8427->bus);
 309         end_time = jiffies + chip->reset_timeout;
 310         while (time_after_eq(end_time, jiffies)) {
 311                 snd_i2c_lock(cs8427->bus);
 312                 data = snd_cs8427_reg_read(cs8427, CS8427_REG_RECVERRORS);
 313                 snd_i2c_unlock(cs8427->bus);
 314                 if (!(data & CS8427_UNLOCK))
 315                         break;
 316                 set_current_state(TASK_UNINTERRUPTIBLE);
 317                 schedule_timeout(1);
 318         }
 319         snd_i2c_lock(cs8427->bus);
 320         chip->regmap[CS8427_REG_CLOCKSOURCE] &= ~CS8427_RXDMASK;
 321         chip->regmap[CS8427_REG_CLOCKSOURCE] |= CS8427_RXDAES3INPUT;
 322         snd_cs8427_reg_write(cs8427, CS8427_REG_CLOCKSOURCE, chip->regmap[CS8427_REG_CLOCKSOURCE]);
 323         snd_i2c_unlock(cs8427->bus);
 324 }
 325
 326 static int snd_cs8427_in_status_info(snd_kcontrol_t *kcontrol,
 327                                      snd_ctl_elem_info_t *uinfo)
 328 {
 329         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 330         uinfo->count = 1;
 331         uinfo->value.integer.min = 0;
 332         uinfo->value.integer.max = 255;
 333         return 0;
 334 }
 335
 336 static int snd_cs8427_in_status_get(snd_kcontrol_t *kcontrol,
 337                                     snd_ctl_elem_value_t *ucontrol)
 338 {
 339         snd_i2c_device_t *device = snd_kcontrol_chip(kcontrol);
 340         int data;
 341
 342         snd_i2c_lock(device->bus);
 343         data = snd_cs8427_reg_read(device, kcontrol->private_value);
 344         snd_i2c_unlock(device->bus);
 345         if (data < 0)
 346                 return data;
 347         ucontrol->value.integer.value[0] = data;
 348         return 0;
 349 }
 350
 351 static int snd_cs8427_qsubcode_info(snd_kcontrol_t *kcontrol,
 352                                     snd_ctl_elem_info_t *uinfo)
 353 {
 354         uinfo->type = SNDRV_CTL_ELEM_TYPE_BYTES;
 355         uinfo->count = 10;
 356         return 0;
 357 }
 358
 359 static int snd_cs8427_qsubcode_get(snd_kcontrol_t *kcontrol,
 360                                    snd_ctl_elem_value_t *ucontrol)
 361 {
 362         snd_i2c_device_t *device = snd_kcontrol_chip(kcontrol);
 363         unsigned char reg = CS8427_REG_QSUBCODE;
 364         int err;
 365
 366         snd_i2c_lock(device->bus);
 367         if ((err = snd_i2c_sendbytes(device, &reg, 1)) != 1) {
 368                 snd_printk("unable to send register 0x%x byte to CS8427\n", reg);
 369                 snd_i2c_unlock(device->bus);
 370                 return err < 0 ? err : -EIO;
 371         }
 372         if ((err = snd_i2c_readbytes(device, ucontrol->value.bytes.data, 10)) != 10) {
 373                 snd_printk("unable to read Q-subcode bytes from CS8427\n");
 374                 snd_i2c_unlock(device->bus);
 375                 return err < 0 ? err : -EIO;
 376         }
 377         snd_i2c_unlock(device->bus);
 378         return 0;
 379 }
 380
 381 static int snd_cs8427_spdif_info(snd_kcontrol_t *kcontrol, snd_ctl_elem_info_t * uinfo)
 382 {
 383         uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
 384         uinfo->count = 1;
 385         return 0;
 386 }
 387
 388 static int snd_cs8427_spdif_get(snd_kcontrol_t * kcontrol,
 389                                 snd_ctl_elem_value_t * ucontrol)
 390 {
 391         snd_i2c_device_t *device = snd_kcontrol_chip(kcontrol);
 392         cs8427_t *chip = snd_magic_cast(cs8427_t, device->private_data, return -ENXIO);
 393
 394         snd_i2c_lock(device->bus);
 395         memcpy(ucontrol->value.iec958.status, chip->playback.def_status, 24);
 396         snd_i2c_unlock(device->bus);
 397         return 0;
 398 }
 399
 400 static int snd_cs8427_spdif_put(snd_kcontrol_t * kcontrol,
 401                                 snd_ctl_elem_value_t * ucontrol)
 402 {
 403         snd_i2c_device_t *device = snd_kcontrol_chip(kcontrol);
 404         cs8427_t *chip = snd_magic_cast(cs8427_t, device->private_data, return -ENXIO);
 405         unsigned char *status = kcontrol->private_value ? chip->playback.pcm_status : chip->playback.def_status;
 406         snd_pcm_runtime_t *runtime = chip->playback.substream ? chip->playback.substream->runtime : NULL;
 407         int err, change;
 408
 409         snd_i2c_lock(device->bus);
 410         change = memcmp(ucontrol->value.iec958.status, status, 24) != 0;
 411         memcpy(status, ucontrol->value.iec958.status, 24);
 412         if (change && (kcontrol->private_value ? runtime != NULL : runtime == NULL)) {
 413                 err = snd_cs8427_send_corudata(device, 0, status, 24);
 414                 if (err < 0)
 415                         change = err;
 416         }
 417         snd_i2c_unlock(device->bus);
 418         return change;
 419 }
 420
 421 static int snd_cs8427_spdif_mask_info(snd_kcontrol_t *kcontrol, snd_ctl_elem_info_t * uinfo)
 422 {
 423         uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
 424         uinfo->count = 1;
 425         return 0;
 426 }
 427
 428 static int snd_cs8427_spdif_mask_get(snd_kcontrol_t * kcontrol,
 429                                       snd_ctl_elem_value_t * ucontrol)
 430 {
 431         memset(ucontrol->value.iec958.status, 0xff, 24);
 432         return 0;
 433 }
 434
 435 #define CONTROLS (sizeof(snd_cs8427_iec958_controls)/sizeof(snd_kcontrol_new_t))
 436
 437 static snd_kcontrol_new_t snd_cs8427_iec958_controls[] = {
 438 {
 439         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 440         .info =         snd_cs8427_in_status_info,
 441         .name =         "IEC958 CS8427 Input Status",
 442         .access =       SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
 443         .get =          snd_cs8427_in_status_get,
 444         .private_value = 15,
 445 },
 446 {
 447         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 448         .info =         snd_cs8427_in_status_info,
 449         .name =         "IEC958 CS8427 Error Status",
 450         .access =       SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
 451         .get =          snd_cs8427_in_status_get,
 452         .private_value = 16,
 453 },
 454 {
 455         .access =       SNDRV_CTL_ELEM_ACCESS_READ,
 456         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 457         .name =         SNDRV_CTL_NAME_IEC958("",PLAYBACK,MASK),
 458         .info =         snd_cs8427_spdif_mask_info,
 459         .get =          snd_cs8427_spdif_mask_get,
 460 },
 461 {
 462         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 463         .name =         SNDRV_CTL_NAME_IEC958("",PLAYBACK,DEFAULT),
 464         .info =         snd_cs8427_spdif_info,
 465         .get =          snd_cs8427_spdif_get,
 466         .put =          snd_cs8427_spdif_put,
 467         .private_value = 0
 468 },
 469 {
 470         .access =       SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_INACTIVE,
 471         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 472         .name =         SNDRV_CTL_NAME_IEC958("",PLAYBACK,PCM_STREAM),
 473         .info =         snd_cs8427_spdif_info,
 474         .get =          snd_cs8427_spdif_get,
 475         .put =          snd_cs8427_spdif_put,
 476         .private_value = 1
 477 },
 478 {
 479         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 480         .info =         snd_cs8427_qsubcode_info,
 481         .name =         "IEC958 Q-subcode Capture Default",
 482         .access =       SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
 483         .get =          snd_cs8427_qsubcode_get
 484 }};
 485
 486 int snd_cs8427_iec958_build(snd_i2c_device_t *cs8427,
 487                             snd_pcm_substream_t *play_substream,
 488                             snd_pcm_substream_t *cap_substream)
 489 {
 490         cs8427_t *chip = snd_magic_cast(cs8427_t, cs8427->private_data, return -ENXIO);
 491         snd_kcontrol_t *kctl;
 492         unsigned int idx;
 493         int err;
 494
 495         snd_assert(play_substream && cap_substream, return -EINVAL);
 496         for (idx = 0; idx < CONTROLS; idx++) {
 497                 kctl = snd_ctl_new1(&snd_cs8427_iec958_controls[idx], cs8427);
 498                 if (kctl == NULL)
 499                         return -ENOMEM;
 500                 kctl->id.device = play_substream->pcm->device;
 501                 kctl->id.subdevice = play_substream->number;
 502                 err = snd_ctl_add(cs8427->bus->card, kctl);
 503                 if (err < 0)
 504                         return err;
 505                 if (!strcmp(kctl->id.name, SNDRV_CTL_NAME_IEC958("",PLAYBACK,PCM_STREAM)))
 506                         chip->playback.pcm_ctl = kctl;
 507         }
 508
 509         chip->playback.substream = play_substream;
 510         chip->capture.substream = cap_substream;
 511         snd_assert(chip->playback.pcm_ctl, return -EIO);
 512         return 0;
 513 }
 514
 515 int snd_cs8427_iec958_active(snd_i2c_device_t *cs8427, int active)
 516 {
 517         cs8427_t *chip;
 518
 519         snd_assert(cs8427, return -ENXIO);
 520         chip = snd_magic_cast(cs8427_t, cs8427->private_data, return -ENXIO);
 521         if (active)
 522                 memcpy(chip->playback.pcm_status, chip->playback.def_status, 24);
 523         chip->playback.pcm_ctl->vd[0].access &= ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
 524         snd_ctl_notify(cs8427->bus->card, SNDRV_CTL_EVENT_MASK_VALUE |
 525                                           SNDRV_CTL_EVENT_MASK_INFO, &chip->playback.pcm_ctl->id);
 526         return 0;
 527 }
 528
 529 int snd_cs8427_iec958_pcm(snd_i2c_device_t *cs8427, unsigned int rate)
 530 {
 531         cs8427_t *chip;
 532         char *status;
 533         int err, reset;
 534
 535         snd_assert(cs8427, return -ENXIO);
 536         chip = snd_magic_cast(cs8427_t, cs8427->private_data, return -ENXIO);
 537         status = chip->playback.pcm_status;
 538         snd_i2c_lock(cs8427->bus);
 539         if (status[0] & IEC958_AES0_PROFESSIONAL) {
 540                 status[0] &= ~IEC958_AES0_PRO_FS;
 541                 switch (rate) {
 542                 case 32000: status[0] |= IEC958_AES0_PRO_FS_32000; break;
 543                 case 44100: status[0] |= IEC958_AES0_PRO_FS_44100; break;
 544                 case 48000: status[0] |= IEC958_AES0_PRO_FS_48000; break;
 545                 default: status[0] |= IEC958_AES0_PRO_FS_NOTID; break;
 546                 }
 547         } else {
 548                 status[3] &= ~IEC958_AES3_CON_FS;
 549                 switch (rate) {
 550                 case 32000: status[3] |= IEC958_AES3_CON_FS_32000; break;
 551                 case 44100: status[3] |= IEC958_AES3_CON_FS_44100; break;
 552                 case 48000: status[3] |= IEC958_AES3_CON_FS_48000; break;
 553                 }
 554         }
 555         err = snd_cs8427_send_corudata(cs8427, 0, status, 24);
 556         if (err > 0)
 557                 snd_ctl_notify(cs8427->bus->card,
 558                                SNDRV_CTL_EVENT_MASK_VALUE,
 559                                &chip->playback.pcm_ctl->id);
 560         reset = chip->rate != rate;
 561         chip->rate = rate;
 562         snd_i2c_unlock(cs8427->bus);
 563         if (reset)
 564                 snd_cs8427_reset(cs8427);
 565         return err < 0 ? err : 0;
 566 }
 567
 568 static int __init alsa_cs8427_module_init(void)
 569 {
 570         return 0;
 571 }
 572
 573 static void __exit alsa_cs8427_module_exit(void)
 574 {
 575 }
 576
 577 module_init(alsa_cs8427_module_init)
 578 module_exit(alsa_cs8427_module_exit)
 579
 580 EXPORT_SYMBOL(snd_cs8427_detect);
 581 EXPORT_SYMBOL(snd_cs8427_create);
 582 EXPORT_SYMBOL(snd_cs8427_reset);
 583 EXPORT_SYMBOL(snd_cs8427_reg_write);
 584 EXPORT_SYMBOL(snd_cs8427_reg_read);
 585 EXPORT_SYMBOL(snd_cs8427_iec958_build);
 586 EXPORT_SYMBOL(snd_cs8427_iec958_active);
 587 EXPORT_SYMBOL(snd_cs8427_iec958_pcm);