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 CS8427_ADDR                     (0x20>>1) /* fixed address */
  38
  39 typedef struct {
  40         snd_pcm_substream_t *substream;
  41         char hw_status[24];             /* hardware status */
  42         char def_status[24];            /* default status */
  43         char pcm_status[24];            /* PCM private status */
  44         char hw_udata[32];
  45         snd_kcontrol_t *pcm_ctl;
  46 } cs8427_stream_t;
  47
  48 typedef struct {
  49         unsigned char regmap[0x14];     /* map of first 1 + 13 registers */
  50         unsigned int rate;
  51         unsigned int reset_timeout;
  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 = device->private_data;
 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 = device->private_data;
 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                 kfree(device->private_data);
 161 }
 162
 163 int snd_cs8427_create(snd_i2c_bus_t *bus,
 164                       unsigned char addr,
 165                       unsigned int reset_timeout,
 166                       snd_i2c_device_t **r_cs8427)
 167 {
 168         static unsigned char initvals1[] = {
 169           CS8427_REG_CONTROL1 | CS8427_REG_AUTOINC,
 170           /* CS8427_REG_CONTROL1: RMCK to OMCK, valid PCM audio, disable mutes, TCBL=output */
 171           CS8427_SWCLK | CS8427_TCBLDIR,
 172           /* CS8427_REG_CONTROL2: hold last valid audio sample, RMCK=256*Fs, normal stereo operation */
 173           0x00,
 174           /* CS8427_REG_DATAFLOW: output drivers normal operation, Tx<=serial, Rx=>serial */
 175           CS8427_TXDSERIAL | CS8427_SPDAES3RECEIVER,
 176           /* CS8427_REG_CLOCKSOURCE: Run off, CMCK=256*Fs, output time base = OMCK, input time base =
 177              recovered input clock, recovered input clock source is ILRCK changed to AES3INPUT (workaround, see snd_cs8427_reset) */
 178           CS8427_RXDILRCK,
 179           /* CS8427_REG_SERIALINPUT: Serial audio input port data format = I2S, 24-bit, 64*Fsi */
 180           CS8427_SIDEL | CS8427_SILRPOL,
 181           /* CS8427_REG_SERIALOUTPUT: Serial audio output port data format = I2S, 24-bit, 64*Fsi */
 182           CS8427_SODEL | CS8427_SOLRPOL,
 183         };
 184         static unsigned char initvals2[] = {
 185           CS8427_REG_RECVERRMASK | CS8427_REG_AUTOINC,
 186           /* CS8427_REG_RECVERRMASK: unmask the input PLL clock, V, confidence, biphase, parity status bits */
 187           /* CS8427_UNLOCK | CS8427_V | CS8427_CONF | CS8427_BIP | CS8427_PAR, */
 188           0xff, /* set everything */
 189           /* CS8427_REG_CSDATABUF:
 190              Registers 32-55 window to CS buffer
 191              Inhibit D->E transfers from overwriting first 5 bytes of CS data.
 192              Inhibit D->E transfers (all) of CS data.
 193              Allow E->F transfer of CS data.
 194              One byte mode; both A/B channels get same written CB data.
 195              A channel info is output to chip's EMPH* pin. */
 196           CS8427_CBMR | CS8427_DETCI,
 197           /* CS8427_REG_UDATABUF:
 198              Use internal buffer to transmit User (U) data.
 199              Chip's U pin is an output.
 200              Transmit all O's for user data.
 201              Inhibit D->E transfers.
 202              Inhibit E->F transfers. */
 203           CS8427_UD | CS8427_EFTUI | CS8427_DETUI,
 204         };
 205         int err;
 206         cs8427_t *chip;
 207         snd_i2c_device_t *device;
 208         unsigned char buf[24];
 209
 210         if ((err = snd_i2c_device_create(bus, "CS8427", CS8427_ADDR | (addr & 7), &device)) < 0)
 211                 return err;
 212         chip = device->private_data = kcalloc(1, sizeof(*chip), GFP_KERNEL);
 213         if (chip == NULL) {
 214                 snd_i2c_device_free(device);
 215                 return -ENOMEM;
 216         }
 217         device->private_free = snd_cs8427_free;
 218
 219         snd_i2c_lock(bus);
 220         if ((err = snd_cs8427_reg_read(device, CS8427_REG_ID_AND_VER)) != CS8427_VER8427A) {
 221                 snd_i2c_unlock(bus);
 222                 snd_printk("unable to find CS8427 signature (expected 0x%x, read 0x%x), initialization is not completed\n", CS8427_VER8427A, err);
 223                 return -EFAULT;
 224         }
 225         /* turn off run bit while making changes to configuration */
 226         if ((err = snd_cs8427_reg_write(device, CS8427_REG_CLOCKSOURCE, 0x00)) < 0)
 227                 goto __fail;
 228         /* send initial values */
 229         memcpy(chip->regmap + (initvals1[0] & 0x7f), initvals1 + 1, 6);
 230         if ((err = snd_i2c_sendbytes(device, initvals1, 7)) != 7) {
 231                 err = err < 0 ? err : -EIO;
 232                 goto __fail;
 233         }
 234         /* Turn off CS8427 interrupt stuff that is not used in hardware */
 235         memset(buf, 0, 7);
 236         /* from address 9 to 15 */
 237         buf[0] = 9;     /* register */
 238         if ((err = snd_i2c_sendbytes(device, buf, 7)) != 7)
 239                 goto __fail;
 240         /* send transfer initialization sequence */
 241         memcpy(chip->regmap + (initvals2[0] & 0x7f), initvals2 + 1, 3);
 242         if ((err = snd_i2c_sendbytes(device, initvals2, 4)) != 4) {
 243                 err = err < 0 ? err : -EIO;
 244                 goto __fail;
 245         }
 246         /* write default channel status bytes */
 247         buf[0] = ((unsigned char)(SNDRV_PCM_DEFAULT_CON_SPDIF >> 0));
 248         buf[1] = ((unsigned char)(SNDRV_PCM_DEFAULT_CON_SPDIF >> 8));
 249         buf[2] = ((unsigned char)(SNDRV_PCM_DEFAULT_CON_SPDIF >> 16));
 250         buf[3] = ((unsigned char)(SNDRV_PCM_DEFAULT_CON_SPDIF >> 24));
 251         memset(buf + 4, 0, 24 - 4);
 252         if (snd_cs8427_send_corudata(device, 0, buf, 24) < 0)
 253                 goto __fail;
 254         memcpy(chip->playback.def_status, buf, 24);
 255         memcpy(chip->playback.pcm_status, buf, 24);
 256         snd_i2c_unlock(bus);
 257
 258         /* turn on run bit and rock'n'roll */
 259         if (reset_timeout < 1)
 260                 reset_timeout = 1;
 261         chip->reset_timeout = reset_timeout;
 262         snd_cs8427_reset(device);
 263
 264 #if 0   // it's nice for read tests
 265         {
 266         char buf[128];
 267         int xx;
 268         buf[0] = 0x81;
 269         snd_i2c_sendbytes(device, buf, 1);
 270         snd_i2c_readbytes(device, buf, 127);
 271         for (xx = 0; xx < 127; xx++)
 272                 printk("reg[0x%x] = 0x%x\n", xx+1, buf[xx]);
 273         }
 274 #endif
 275
 276         if (r_cs8427)
 277                 *r_cs8427 = device;
 278         return 0;
 279
 280       __fail:
 281         snd_i2c_unlock(bus);
 282         snd_i2c_device_free(device);
 283         return err < 0 ? err : -EIO;
 284 }
 285
 286 /*
 287  * Reset the chip using run bit, also lock PLL using ILRCK and
 288  * put back AES3INPUT. This workaround is described in latest
 289  * CS8427 datasheet, otherwise TXDSERIAL will not work.
 290  */
 291 void snd_cs8427_reset(snd_i2c_device_t *cs8427)
 292 {
 293         cs8427_t *chip;
 294         unsigned long end_time;
 295         int data;
 296
 297         snd_assert(cs8427, return);
 298         chip = cs8427->private_data;
 299         snd_i2c_lock(cs8427->bus);
 300         chip->regmap[CS8427_REG_CLOCKSOURCE] &= ~(CS8427_RUN | CS8427_RXDMASK);
 301         snd_cs8427_reg_write(cs8427, CS8427_REG_CLOCKSOURCE, chip->regmap[CS8427_REG_CLOCKSOURCE]);
 302         udelay(200);
 303         chip->regmap[CS8427_REG_CLOCKSOURCE] |= CS8427_RUN | CS8427_RXDILRCK;
 304         snd_cs8427_reg_write(cs8427, CS8427_REG_CLOCKSOURCE, chip->regmap[CS8427_REG_CLOCKSOURCE]);
 305         udelay(200);
 306         snd_i2c_unlock(cs8427->bus);
 307         end_time = jiffies + chip->reset_timeout;
 308         while (time_after_eq(end_time, jiffies)) {
 309                 snd_i2c_lock(cs8427->bus);
 310                 data = snd_cs8427_reg_read(cs8427, CS8427_REG_RECVERRORS);
 311                 snd_i2c_unlock(cs8427->bus);
 312                 if (!(data & CS8427_UNLOCK))
 313                         break;
 314                 set_current_state(TASK_UNINTERRUPTIBLE);
 315                 schedule_timeout(1);
 316         }
 317         snd_i2c_lock(cs8427->bus);
 318         chip->regmap[CS8427_REG_CLOCKSOURCE] &= ~CS8427_RXDMASK;
 319         chip->regmap[CS8427_REG_CLOCKSOURCE] |= CS8427_RXDAES3INPUT;
 320         snd_cs8427_reg_write(cs8427, CS8427_REG_CLOCKSOURCE, chip->regmap[CS8427_REG_CLOCKSOURCE]);
 321         snd_i2c_unlock(cs8427->bus);
 322 }
 323
 324 static int snd_cs8427_in_status_info(snd_kcontrol_t *kcontrol,
 325                                      snd_ctl_elem_info_t *uinfo)
 326 {
 327         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 328         uinfo->count = 1;
 329         uinfo->value.integer.min = 0;
 330         uinfo->value.integer.max = 255;
 331         return 0;
 332 }
 333
 334 static int snd_cs8427_in_status_get(snd_kcontrol_t *kcontrol,
 335                                     snd_ctl_elem_value_t *ucontrol)
 336 {
 337         snd_i2c_device_t *device = snd_kcontrol_chip(kcontrol);
 338         int data;
 339
 340         snd_i2c_lock(device->bus);
 341         data = snd_cs8427_reg_read(device, kcontrol->private_value);
 342         snd_i2c_unlock(device->bus);
 343         if (data < 0)
 344                 return data;
 345         ucontrol->value.integer.value[0] = data;
 346         return 0;
 347 }
 348
 349 static int snd_cs8427_qsubcode_info(snd_kcontrol_t *kcontrol,
 350                                     snd_ctl_elem_info_t *uinfo)
 351 {
 352         uinfo->type = SNDRV_CTL_ELEM_TYPE_BYTES;
 353         uinfo->count = 10;
 354         return 0;
 355 }
 356
 357 static int snd_cs8427_qsubcode_get(snd_kcontrol_t *kcontrol,
 358                                    snd_ctl_elem_value_t *ucontrol)
 359 {
 360         snd_i2c_device_t *device = snd_kcontrol_chip(kcontrol);
 361         unsigned char reg = CS8427_REG_QSUBCODE;
 362         int err;
 363
 364         snd_i2c_lock(device->bus);
 365         if ((err = snd_i2c_sendbytes(device, &reg, 1)) != 1) {
 366                 snd_printk("unable to send register 0x%x byte to CS8427\n", reg);
 367                 snd_i2c_unlock(device->bus);
 368                 return err < 0 ? err : -EIO;
 369         }
 370         if ((err = snd_i2c_readbytes(device, ucontrol->value.bytes.data, 10)) != 10) {
 371                 snd_printk("unable to read Q-subcode bytes from CS8427\n");
 372                 snd_i2c_unlock(device->bus);
 373                 return err < 0 ? err : -EIO;
 374         }
 375         snd_i2c_unlock(device->bus);
 376         return 0;
 377 }
 378
 379 static int snd_cs8427_spdif_info(snd_kcontrol_t *kcontrol, snd_ctl_elem_info_t * uinfo)
 380 {
 381         uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
 382         uinfo->count = 1;
 383         return 0;
 384 }
 385
 386 static int snd_cs8427_spdif_get(snd_kcontrol_t * kcontrol,
 387                                 snd_ctl_elem_value_t * ucontrol)
 388 {
 389         snd_i2c_device_t *device = snd_kcontrol_chip(kcontrol);
 390         cs8427_t *chip = device->private_data;
 391
 392         snd_i2c_lock(device->bus);
 393         memcpy(ucontrol->value.iec958.status, chip->playback.def_status, 24);
 394         snd_i2c_unlock(device->bus);
 395         return 0;
 396 }
 397
 398 static int snd_cs8427_spdif_put(snd_kcontrol_t * kcontrol,
 399                                 snd_ctl_elem_value_t * ucontrol)
 400 {
 401         snd_i2c_device_t *device = snd_kcontrol_chip(kcontrol);
 402         cs8427_t *chip = device->private_data;
 403         unsigned char *status = kcontrol->private_value ? chip->playback.pcm_status : chip->playback.def_status;
 404         snd_pcm_runtime_t *runtime = chip->playback.substream ? chip->playback.substream->runtime : NULL;
 405         int err, change;
 406
 407         snd_i2c_lock(device->bus);
 408         change = memcmp(ucontrol->value.iec958.status, status, 24) != 0;
 409         memcpy(status, ucontrol->value.iec958.status, 24);
 410         if (change && (kcontrol->private_value ? runtime != NULL : runtime == NULL)) {
 411                 err = snd_cs8427_send_corudata(device, 0, status, 24);
 412                 if (err < 0)
 413                         change = err;
 414         }
 415         snd_i2c_unlock(device->bus);
 416         return change;
 417 }
 418
 419 static int snd_cs8427_spdif_mask_info(snd_kcontrol_t *kcontrol, snd_ctl_elem_info_t * 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_mask_get(snd_kcontrol_t * kcontrol,
 427                                       snd_ctl_elem_value_t * ucontrol)
 428 {
 429         memset(ucontrol->value.iec958.status, 0xff, 24);
 430         return 0;
 431 }
 432
 433 static snd_kcontrol_new_t snd_cs8427_iec958_controls[] = {
 434 {
 435         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 436         .info =         snd_cs8427_in_status_info,
 437         .name =         "IEC958 CS8427 Input Status",
 438         .access =       SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
 439         .get =          snd_cs8427_in_status_get,
 440         .private_value = 15,
 441 },
 442 {
 443         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 444         .info =         snd_cs8427_in_status_info,
 445         .name =         "IEC958 CS8427 Error Status",
 446         .access =       SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
 447         .get =          snd_cs8427_in_status_get,
 448         .private_value = 16,
 449 },
 450 {
 451         .access =       SNDRV_CTL_ELEM_ACCESS_READ,
 452         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 453         .name =         SNDRV_CTL_NAME_IEC958("",PLAYBACK,MASK),
 454         .info =         snd_cs8427_spdif_mask_info,
 455         .get =          snd_cs8427_spdif_mask_get,
 456 },
 457 {
 458         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 459         .name =         SNDRV_CTL_NAME_IEC958("",PLAYBACK,DEFAULT),
 460         .info =         snd_cs8427_spdif_info,
 461         .get =          snd_cs8427_spdif_get,
 462         .put =          snd_cs8427_spdif_put,
 463         .private_value = 0
 464 },
 465 {
 466         .access =       SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_INACTIVE,
 467         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 468         .name =         SNDRV_CTL_NAME_IEC958("",PLAYBACK,PCM_STREAM),
 469         .info =         snd_cs8427_spdif_info,
 470         .get =          snd_cs8427_spdif_get,
 471         .put =          snd_cs8427_spdif_put,
 472         .private_value = 1
 473 },
 474 {
 475         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 476         .info =         snd_cs8427_qsubcode_info,
 477         .name =         "IEC958 Q-subcode Capture Default",
 478         .access =       SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
 479         .get =          snd_cs8427_qsubcode_get
 480 }};
 481
 482 int snd_cs8427_iec958_build(snd_i2c_device_t *cs8427,
 483                             snd_pcm_substream_t *play_substream,
 484                             snd_pcm_substream_t *cap_substream)
 485 {
 486         cs8427_t *chip = cs8427->private_data;
 487         snd_kcontrol_t *kctl;
 488         unsigned int idx;
 489         int err;
 490
 491         snd_assert(play_substream && cap_substream, return -EINVAL);
 492         for (idx = 0; idx < ARRAY_SIZE(snd_cs8427_iec958_controls); idx++) {
 493                 kctl = snd_ctl_new1(&snd_cs8427_iec958_controls[idx], cs8427);
 494                 if (kctl == NULL)
 495                         return -ENOMEM;
 496                 kctl->id.device = play_substream->pcm->device;
 497                 kctl->id.subdevice = play_substream->number;
 498                 err = snd_ctl_add(cs8427->bus->card, kctl);
 499                 if (err < 0)
 500                         return err;
 501                 if (!strcmp(kctl->id.name, SNDRV_CTL_NAME_IEC958("",PLAYBACK,PCM_STREAM)))
 502                         chip->playback.pcm_ctl = kctl;
 503         }
 504
 505         chip->playback.substream = play_substream;
 506         chip->capture.substream = cap_substream;
 507         snd_assert(chip->playback.pcm_ctl, return -EIO);
 508         return 0;
 509 }
 510
 511 int snd_cs8427_iec958_active(snd_i2c_device_t *cs8427, int active)
 512 {
 513         cs8427_t *chip;
 514
 515         snd_assert(cs8427, return -ENXIO);
 516         chip = cs8427->private_data;
 517         if (active)
 518                 memcpy(chip->playback.pcm_status, chip->playback.def_status, 24);
 519         chip->playback.pcm_ctl->vd[0].access &= ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
 520         snd_ctl_notify(cs8427->bus->card, SNDRV_CTL_EVENT_MASK_VALUE |
 521                                           SNDRV_CTL_EVENT_MASK_INFO, &chip->playback.pcm_ctl->id);
 522         return 0;
 523 }
 524
 525 int snd_cs8427_iec958_pcm(snd_i2c_device_t *cs8427, unsigned int rate)
 526 {
 527         cs8427_t *chip;
 528         char *status;
 529         int err, reset;
 530
 531         snd_assert(cs8427, return -ENXIO);
 532         chip = cs8427->private_data;
 533         status = chip->playback.pcm_status;
 534         snd_i2c_lock(cs8427->bus);
 535         if (status[0] & IEC958_AES0_PROFESSIONAL) {
 536                 status[0] &= ~IEC958_AES0_PRO_FS;
 537                 switch (rate) {
 538                 case 32000: status[0] |= IEC958_AES0_PRO_FS_32000; break;
 539                 case 44100: status[0] |= IEC958_AES0_PRO_FS_44100; break;
 540                 case 48000: status[0] |= IEC958_AES0_PRO_FS_48000; break;
 541                 default: status[0] |= IEC958_AES0_PRO_FS_NOTID; break;
 542                 }
 543         } else {
 544                 status[3] &= ~IEC958_AES3_CON_FS;
 545                 switch (rate) {
 546                 case 32000: status[3] |= IEC958_AES3_CON_FS_32000; break;
 547                 case 44100: status[3] |= IEC958_AES3_CON_FS_44100; break;
 548                 case 48000: status[3] |= IEC958_AES3_CON_FS_48000; break;
 549                 }
 550         }
 551         err = snd_cs8427_send_corudata(cs8427, 0, status, 24);
 552         if (err > 0)
 553                 snd_ctl_notify(cs8427->bus->card,
 554                                SNDRV_CTL_EVENT_MASK_VALUE,
 555                                &chip->playback.pcm_ctl->id);
 556         reset = chip->rate != rate;
 557         chip->rate = rate;
 558         snd_i2c_unlock(cs8427->bus);
 559         if (reset)
 560                 snd_cs8427_reset(cs8427);
 561         return err < 0 ? err : 0;
 562 }
 563
 564 static int __init alsa_cs8427_module_init(void)
 565 {
 566         return 0;
 567 }
 568
 569 static void __exit alsa_cs8427_module_exit(void)
 570 {
 571 }
 572
 573 module_init(alsa_cs8427_module_init)
 574 module_exit(alsa_cs8427_module_exit)
 575
 576 EXPORT_SYMBOL(snd_cs8427_detect);
 577 EXPORT_SYMBOL(snd_cs8427_create);
 578 EXPORT_SYMBOL(snd_cs8427_reset);
 579 EXPORT_SYMBOL(snd_cs8427_reg_write);
 580 EXPORT_SYMBOL(snd_cs8427_reg_read);
 581 EXPORT_SYMBOL(snd_cs8427_iec958_build);
 582 EXPORT_SYMBOL(snd_cs8427_iec958_active);
 583 EXPORT_SYMBOL(snd_cs8427_iec958_pcm);