sound/i2c/cs8427.c

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This source file includes following definitions.
snd_cs8427_reg_write
snd_cs8427_reg_read
snd_cs8427_select_corudata
snd_cs8427_send_corudata
snd_cs8427_free
snd_cs8427_init
snd_cs8427_create
snd_cs8427_reset
snd_cs8427_in_status_info
snd_cs8427_in_status_get
snd_cs8427_qsubcode_info
snd_cs8427_qsubcode_get
snd_cs8427_spdif_info
snd_cs8427_spdif_get
snd_cs8427_spdif_put
snd_cs8427_spdif_mask_info
snd_cs8427_spdif_mask_get
snd_cs8427_iec958_build
snd_cs8427_iec958_active
snd_cs8427_iec958_pcm
   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Routines for control of the CS8427 via i2c bus
   4  *  IEC958 (S/PDIF) receiver & transmitter by Cirrus Logic
   5  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   6  */
   7 
   8 #include <linux/slab.h>
   9 #include <linux/delay.h>
  10 #include <linux/init.h>
  11 #include <linux/bitrev.h>
  12 #include <linux/module.h>
  13 #include <asm/unaligned.h>
  14 #include <sound/core.h>
  15 #include <sound/control.h>
  16 #include <sound/pcm.h>
  17 #include <sound/cs8427.h>
  18 #include <sound/asoundef.h>
  19 
  20 static void snd_cs8427_reset(struct snd_i2c_device *cs8427);
  21 
  22 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
  23 MODULE_DESCRIPTION("IEC958 (S/PDIF) receiver & transmitter by Cirrus Logic");
  24 MODULE_LICENSE("GPL");
  25 
  26 #define CS8427_ADDR                     (0x20>>1) /* fixed address */
  27 
  28 struct cs8427_stream {
  29         struct snd_pcm_substream *substream;
  30         char hw_status[24];             /* hardware status */
  31         char def_status[24];            /* default status */
  32         char pcm_status[24];            /* PCM private status */
  33         char hw_udata[32];
  34         struct snd_kcontrol *pcm_ctl;
  35 };
  36 
  37 struct cs8427 {
  38         unsigned char regmap[0x14];     /* map of first 1 + 13 registers */
  39         unsigned int rate;
  40         unsigned int reset_timeout;
  41         struct cs8427_stream playback;
  42         struct cs8427_stream capture;
  43 };
  44 
  45 int snd_cs8427_reg_write(struct snd_i2c_device *device, unsigned char reg,
  46                          unsigned char val)
  47 {
  48         int err;
  49         unsigned char buf[2];
  50 
  51         buf[0] = reg & 0x7f;
  52         buf[1] = val;
  53         if ((err = snd_i2c_sendbytes(device, buf, 2)) != 2) {
  54                 snd_printk(KERN_ERR "unable to send bytes 0x%02x:0x%02x "
  55                            "to CS8427 (%i)\n", buf[0], buf[1], err);
  56                 return err < 0 ? err : -EIO;
  57         }
  58         return 0;
  59 }
  60 
  61 EXPORT_SYMBOL(snd_cs8427_reg_write);
  62 
  63 static int snd_cs8427_reg_read(struct snd_i2c_device *device, unsigned char reg)
  64 {
  65         int err;
  66         unsigned char buf;
  67 
  68         if ((err = snd_i2c_sendbytes(device, &reg, 1)) != 1) {
  69                 snd_printk(KERN_ERR "unable to send register 0x%x byte "
  70                            "to CS8427\n", reg);
  71                 return err < 0 ? err : -EIO;
  72         }
  73         if ((err = snd_i2c_readbytes(device, &buf, 1)) != 1) {
  74                 snd_printk(KERN_ERR "unable to read register 0x%x byte "
  75                            "from CS8427\n", reg);
  76                 return err < 0 ? err : -EIO;
  77         }
  78         return buf;
  79 }
  80 
  81 static int snd_cs8427_select_corudata(struct snd_i2c_device *device, int udata)
  82 {
  83         struct cs8427 *chip = device->private_data;
  84         int err;
  85 
  86         udata = udata ? CS8427_BSEL : 0;
  87         if (udata != (chip->regmap[CS8427_REG_CSDATABUF] & udata)) {
  88                 chip->regmap[CS8427_REG_CSDATABUF] &= ~CS8427_BSEL;
  89                 chip->regmap[CS8427_REG_CSDATABUF] |= udata;
  90                 err = snd_cs8427_reg_write(device, CS8427_REG_CSDATABUF,
  91                                            chip->regmap[CS8427_REG_CSDATABUF]);
  92                 if (err < 0)
  93                         return err;
  94         }
  95         return 0;
  96 }
  97 
  98 static int snd_cs8427_send_corudata(struct snd_i2c_device *device,
  99                                     int udata,
 100                                     unsigned char *ndata,
 101                                     int count)
 102 {
 103         struct cs8427 *chip = device->private_data;
 104         char *hw_data = udata ?
 105                 chip->playback.hw_udata : chip->playback.hw_status;
 106         unsigned char data[32];
 107         int err, idx;
 108 
 109         if (!memcmp(hw_data, ndata, count))
 110                 return 0;
 111         if ((err = snd_cs8427_select_corudata(device, udata)) < 0)
 112                 return err;
 113         memcpy(hw_data, ndata, count);
 114         if (udata) {
 115                 memset(data, 0, sizeof(data));
 116                 if (memcmp(hw_data, data, count) == 0) {
 117                         chip->regmap[CS8427_REG_UDATABUF] &= ~CS8427_UBMMASK;
 118                         chip->regmap[CS8427_REG_UDATABUF] |= CS8427_UBMZEROS |
 119                                 CS8427_EFTUI;
 120                         err = snd_cs8427_reg_write(device, CS8427_REG_UDATABUF,
 121                                                    chip->regmap[CS8427_REG_UDATABUF]);
 122                         return err < 0 ? err : 0;
 123                 }
 124         }
 125         data[0] = CS8427_REG_AUTOINC | CS8427_REG_CORU_DATABUF;
 126         for (idx = 0; idx < count; idx++)
 127                 data[idx + 1] = bitrev8(ndata[idx]);
 128         if (snd_i2c_sendbytes(device, data, count + 1) != count + 1)
 129                 return -EIO;
 130         return 1;
 131 }
 132 
 133 static void snd_cs8427_free(struct snd_i2c_device *device)
 134 {
 135         kfree(device->private_data);
 136 }
 137 
 138 int snd_cs8427_init(struct snd_i2c_bus *bus,
 139                     struct snd_i2c_device *device)
 140 {
 141         static unsigned char initvals1[] = {
 142           CS8427_REG_CONTROL1 | CS8427_REG_AUTOINC,
 143           /* CS8427_REG_CONTROL1: RMCK to OMCK, valid PCM audio, disable mutes,
 144              TCBL=output */
 145           CS8427_SWCLK | CS8427_TCBLDIR,
 146           /* CS8427_REG_CONTROL2: hold last valid audio sample, RMCK=256*Fs,
 147              normal stereo operation */
 148           0x00,
 149           /* CS8427_REG_DATAFLOW: output drivers normal operation, Tx<=serial,
 150              Rx=>serial */
 151           CS8427_TXDSERIAL | CS8427_SPDAES3RECEIVER,
 152           /* CS8427_REG_CLOCKSOURCE: Run off, CMCK=256*Fs,
 153              output time base = OMCK, input time base = recovered input clock,
 154              recovered input clock source is ILRCK changed to AES3INPUT
 155              (workaround, see snd_cs8427_reset) */
 156           CS8427_RXDILRCK,
 157           /* CS8427_REG_SERIALINPUT: Serial audio input port data format = I2S,
 158              24-bit, 64*Fsi */
 159           CS8427_SIDEL | CS8427_SILRPOL,
 160           /* CS8427_REG_SERIALOUTPUT: Serial audio output port data format
 161              = I2S, 24-bit, 64*Fsi */
 162           CS8427_SODEL | CS8427_SOLRPOL,
 163         };
 164         static unsigned char initvals2[] = {
 165           CS8427_REG_RECVERRMASK | CS8427_REG_AUTOINC,
 166           /* CS8427_REG_RECVERRMASK: unmask the input PLL clock, V, confidence,
 167              biphase, parity status bits */
 168           /* CS8427_UNLOCK | CS8427_V | CS8427_CONF | CS8427_BIP | CS8427_PAR,*/
 169           0xff, /* set everything */
 170           /* CS8427_REG_CSDATABUF:
 171              Registers 32-55 window to CS buffer
 172              Inhibit D->E transfers from overwriting first 5 bytes of CS data.
 173              Inhibit D->E transfers (all) of CS data.
 174              Allow E->F transfer of CS data.
 175              One byte mode; both A/B channels get same written CB data.
 176              A channel info is output to chip's EMPH* pin. */
 177           CS8427_CBMR | CS8427_DETCI,
 178           /* CS8427_REG_UDATABUF:
 179              Use internal buffer to transmit User (U) data.
 180              Chip's U pin is an output.
 181              Transmit all O's for user data.
 182              Inhibit D->E transfers.
 183              Inhibit E->F transfers. */
 184           CS8427_UD | CS8427_EFTUI | CS8427_DETUI,
 185         };
 186         struct cs8427 *chip = device->private_data;
 187         int err;
 188         unsigned char buf[24];
 189 
 190         snd_i2c_lock(bus);
 191         err = snd_cs8427_reg_read(device, CS8427_REG_ID_AND_VER);
 192         if (err != CS8427_VER8427A) {
 193                 /* give second chance */
 194                 snd_printk(KERN_WARNING "invalid CS8427 signature 0x%x: "
 195                            "let me try again...\n", err);
 196                 err = snd_cs8427_reg_read(device, CS8427_REG_ID_AND_VER);
 197         }
 198         if (err != CS8427_VER8427A) {
 199                 snd_i2c_unlock(bus);
 200                 snd_printk(KERN_ERR "unable to find CS8427 signature "
 201                            "(expected 0x%x, read 0x%x),\n",
 202                            CS8427_VER8427A, err);
 203                 snd_printk(KERN_ERR "   initialization is not completed\n");
 204                 return -EFAULT;
 205         }
 206         /* turn off run bit while making changes to configuration */
 207         err = snd_cs8427_reg_write(device, CS8427_REG_CLOCKSOURCE, 0x00);
 208         if (err < 0)
 209                 goto __fail;
 210         /* send initial values */
 211         memcpy(chip->regmap + (initvals1[0] & 0x7f), initvals1 + 1, 6);
 212         if ((err = snd_i2c_sendbytes(device, initvals1, 7)) != 7) {
 213                 err = err < 0 ? err : -EIO;
 214                 goto __fail;
 215         }
 216         /* Turn off CS8427 interrupt stuff that is not used in hardware */
 217         memset(buf, 0, 7);
 218         /* from address 9 to 15 */
 219         buf[0] = 9;     /* register */
 220         if ((err = snd_i2c_sendbytes(device, buf, 7)) != 7)
 221                 goto __fail;
 222         /* send transfer initialization sequence */
 223         memcpy(chip->regmap + (initvals2[0] & 0x7f), initvals2 + 1, 3);
 224         if ((err = snd_i2c_sendbytes(device, initvals2, 4)) != 4) {
 225                 err = err < 0 ? err : -EIO;
 226                 goto __fail;
 227         }
 228         /* write default channel status bytes */
 229         put_unaligned_le32(SNDRV_PCM_DEFAULT_CON_SPDIF, buf);
 230         memset(buf + 4, 0, 24 - 4);
 231         if (snd_cs8427_send_corudata(device, 0, buf, 24) < 0)
 232                 goto __fail;
 233         memcpy(chip->playback.def_status, buf, 24);
 234         memcpy(chip->playback.pcm_status, buf, 24);
 235         snd_i2c_unlock(bus);
 236 
 237         /* turn on run bit and rock'n'roll */
 238         snd_cs8427_reset(device);
 239 
 240         return 0;
 241 
 242 __fail:
 243         snd_i2c_unlock(bus);
 244 
 245         return err;
 246 }
 247 EXPORT_SYMBOL(snd_cs8427_init);
 248 
 249 int snd_cs8427_create(struct snd_i2c_bus *bus,
 250                       unsigned char addr,
 251                       unsigned int reset_timeout,
 252                       struct snd_i2c_device **r_cs8427)
 253 {
 254         int err;
 255         struct cs8427 *chip;
 256         struct snd_i2c_device *device;
 257 
 258         err = snd_i2c_device_create(bus, "CS8427", CS8427_ADDR | (addr & 7),
 259                                     &device);
 260         if (err < 0)
 261                 return err;
 262         chip = device->private_data = kzalloc(sizeof(*chip), GFP_KERNEL);
 263         if (chip == NULL) {
 264                 snd_i2c_device_free(device);
 265                 return -ENOMEM;
 266         }
 267         device->private_free = snd_cs8427_free;
 268 
 269         if (reset_timeout < 1)
 270                 reset_timeout = 1;
 271         chip->reset_timeout = reset_timeout;
 272 
 273         err = snd_cs8427_init(bus, device);
 274         if (err)
 275                 goto __fail;
 276 
 277 #if 0   // it's nice for read tests
 278         {
 279         char buf[128];
 280         int xx;
 281         buf[0] = 0x81;
 282         snd_i2c_sendbytes(device, buf, 1);
 283         snd_i2c_readbytes(device, buf, 127);
 284         for (xx = 0; xx < 127; xx++)
 285                 printk(KERN_DEBUG "reg[0x%x] = 0x%x\n", xx+1, buf[xx]);
 286         }
 287 #endif
 288         
 289         if (r_cs8427)
 290                 *r_cs8427 = device;
 291         return 0;
 292 
 293       __fail:
 294         snd_i2c_device_free(device);
 295         return err < 0 ? err : -EIO;
 296 }
 297 
 298 EXPORT_SYMBOL(snd_cs8427_create);
 299 
 300 /*
 301  * Reset the chip using run bit, also lock PLL using ILRCK and
 302  * put back AES3INPUT. This workaround is described in latest
 303  * CS8427 datasheet, otherwise TXDSERIAL will not work.
 304  */
 305 static void snd_cs8427_reset(struct snd_i2c_device *cs8427)
 306 {
 307         struct cs8427 *chip;
 308         unsigned long end_time;
 309         int data, aes3input = 0;
 310 
 311         if (snd_BUG_ON(!cs8427))
 312                 return;
 313         chip = cs8427->private_data;
 314         snd_i2c_lock(cs8427->bus);
 315         if ((chip->regmap[CS8427_REG_CLOCKSOURCE] & CS8427_RXDAES3INPUT) ==
 316             CS8427_RXDAES3INPUT)  /* AES3 bit is set */
 317                 aes3input = 1;
 318         chip->regmap[CS8427_REG_CLOCKSOURCE] &= ~(CS8427_RUN | CS8427_RXDMASK);
 319         snd_cs8427_reg_write(cs8427, CS8427_REG_CLOCKSOURCE,
 320                              chip->regmap[CS8427_REG_CLOCKSOURCE]);
 321         udelay(200);
 322         chip->regmap[CS8427_REG_CLOCKSOURCE] |= CS8427_RUN | CS8427_RXDILRCK;
 323         snd_cs8427_reg_write(cs8427, CS8427_REG_CLOCKSOURCE,
 324                              chip->regmap[CS8427_REG_CLOCKSOURCE]);
 325         udelay(200);
 326         snd_i2c_unlock(cs8427->bus);
 327         end_time = jiffies + chip->reset_timeout;
 328         while (time_after_eq(end_time, jiffies)) {
 329                 snd_i2c_lock(cs8427->bus);
 330                 data = snd_cs8427_reg_read(cs8427, CS8427_REG_RECVERRORS);
 331                 snd_i2c_unlock(cs8427->bus);
 332                 if (!(data & CS8427_UNLOCK))
 333                         break;
 334                 schedule_timeout_uninterruptible(1);
 335         }
 336         snd_i2c_lock(cs8427->bus);
 337         chip->regmap[CS8427_REG_CLOCKSOURCE] &= ~CS8427_RXDMASK;
 338         if (aes3input)
 339                 chip->regmap[CS8427_REG_CLOCKSOURCE] |= CS8427_RXDAES3INPUT;
 340         snd_cs8427_reg_write(cs8427, CS8427_REG_CLOCKSOURCE,
 341                              chip->regmap[CS8427_REG_CLOCKSOURCE]);
 342         snd_i2c_unlock(cs8427->bus);
 343 }
 344 
 345 static int snd_cs8427_in_status_info(struct snd_kcontrol *kcontrol,
 346                                      struct snd_ctl_elem_info *uinfo)
 347 {
 348         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 349         uinfo->count = 1;
 350         uinfo->value.integer.min = 0;
 351         uinfo->value.integer.max = 255;
 352         return 0;
 353 }
 354 
 355 static int snd_cs8427_in_status_get(struct snd_kcontrol *kcontrol,
 356                                     struct snd_ctl_elem_value *ucontrol)
 357 {
 358         struct snd_i2c_device *device = snd_kcontrol_chip(kcontrol);
 359         int data;
 360 
 361         snd_i2c_lock(device->bus);
 362         data = snd_cs8427_reg_read(device, kcontrol->private_value);
 363         snd_i2c_unlock(device->bus);
 364         if (data < 0)
 365                 return data;
 366         ucontrol->value.integer.value[0] = data;
 367         return 0;
 368 }
 369 
 370 static int snd_cs8427_qsubcode_info(struct snd_kcontrol *kcontrol,
 371                                     struct snd_ctl_elem_info *uinfo)
 372 {
 373         uinfo->type = SNDRV_CTL_ELEM_TYPE_BYTES;
 374         uinfo->count = 10;
 375         return 0;
 376 }
 377 
 378 static int snd_cs8427_qsubcode_get(struct snd_kcontrol *kcontrol,
 379                                    struct snd_ctl_elem_value *ucontrol)
 380 {
 381         struct snd_i2c_device *device = snd_kcontrol_chip(kcontrol);
 382         unsigned char reg = CS8427_REG_QSUBCODE;
 383         int err;
 384 
 385         snd_i2c_lock(device->bus);
 386         if ((err = snd_i2c_sendbytes(device, &reg, 1)) != 1) {
 387                 snd_printk(KERN_ERR "unable to send register 0x%x byte "
 388                            "to CS8427\n", reg);
 389                 snd_i2c_unlock(device->bus);
 390                 return err < 0 ? err : -EIO;
 391         }
 392         err = snd_i2c_readbytes(device, ucontrol->value.bytes.data, 10);
 393         if (err != 10) {
 394                 snd_printk(KERN_ERR "unable to read Q-subcode bytes "
 395                            "from CS8427\n");
 396                 snd_i2c_unlock(device->bus);
 397                 return err < 0 ? err : -EIO;
 398         }
 399         snd_i2c_unlock(device->bus);
 400         return 0;
 401 }
 402 
 403 static int snd_cs8427_spdif_info(struct snd_kcontrol *kcontrol,
 404                                  struct snd_ctl_elem_info *uinfo)
 405 {
 406         uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
 407         uinfo->count = 1;
 408         return 0;
 409 }
 410 
 411 static int snd_cs8427_spdif_get(struct snd_kcontrol *kcontrol,
 412                                 struct snd_ctl_elem_value *ucontrol)
 413 {
 414         struct snd_i2c_device *device = snd_kcontrol_chip(kcontrol);
 415         struct cs8427 *chip = device->private_data;
 416         
 417         snd_i2c_lock(device->bus);
 418         memcpy(ucontrol->value.iec958.status, chip->playback.def_status, 24);
 419         snd_i2c_unlock(device->bus);
 420         return 0;
 421 }
 422 
 423 static int snd_cs8427_spdif_put(struct snd_kcontrol *kcontrol,
 424                                 struct snd_ctl_elem_value *ucontrol)
 425 {
 426         struct snd_i2c_device *device = snd_kcontrol_chip(kcontrol);
 427         struct cs8427 *chip = device->private_data;
 428         unsigned char *status = kcontrol->private_value ?
 429                 chip->playback.pcm_status : chip->playback.def_status;
 430         struct snd_pcm_runtime *runtime = chip->playback.substream ?
 431                 chip->playback.substream->runtime : NULL;
 432         int err, change;
 433 
 434         snd_i2c_lock(device->bus);
 435         change = memcmp(ucontrol->value.iec958.status, status, 24) != 0;
 436         memcpy(status, ucontrol->value.iec958.status, 24);
 437         if (change && (kcontrol->private_value ?
 438                        runtime != NULL : runtime == NULL)) {
 439                 err = snd_cs8427_send_corudata(device, 0, status, 24);
 440                 if (err < 0)
 441                         change = err;
 442         }
 443         snd_i2c_unlock(device->bus);
 444         return change;
 445 }
 446 
 447 static int snd_cs8427_spdif_mask_info(struct snd_kcontrol *kcontrol,
 448                                       struct snd_ctl_elem_info *uinfo)
 449 {
 450         uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
 451         uinfo->count = 1;
 452         return 0;
 453 }
 454 
 455 static int snd_cs8427_spdif_mask_get(struct snd_kcontrol *kcontrol,
 456                                       struct snd_ctl_elem_value *ucontrol)
 457 {
 458         memset(ucontrol->value.iec958.status, 0xff, 24);
 459         return 0;
 460 }
 461 
 462 static struct snd_kcontrol_new snd_cs8427_iec958_controls[] = {
 463 {
 464         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 465         .info =         snd_cs8427_in_status_info,
 466         .name =         "IEC958 CS8427 Input Status",
 467         .access =       (SNDRV_CTL_ELEM_ACCESS_READ |
 468                          SNDRV_CTL_ELEM_ACCESS_VOLATILE),
 469         .get =          snd_cs8427_in_status_get,
 470         .private_value = 15,
 471 },
 472 {
 473         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 474         .info =         snd_cs8427_in_status_info,
 475         .name =         "IEC958 CS8427 Error Status",
 476         .access =       (SNDRV_CTL_ELEM_ACCESS_READ |
 477                          SNDRV_CTL_ELEM_ACCESS_VOLATILE),
 478         .get =          snd_cs8427_in_status_get,
 479         .private_value = 16,
 480 },
 481 {
 482         .access =       SNDRV_CTL_ELEM_ACCESS_READ,
 483         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 484         .name =         SNDRV_CTL_NAME_IEC958("",PLAYBACK,MASK),
 485         .info =         snd_cs8427_spdif_mask_info,
 486         .get =          snd_cs8427_spdif_mask_get,
 487 },
 488 {
 489         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 490         .name =         SNDRV_CTL_NAME_IEC958("",PLAYBACK,DEFAULT),
 491         .info =         snd_cs8427_spdif_info,
 492         .get =          snd_cs8427_spdif_get,
 493         .put =          snd_cs8427_spdif_put,
 494         .private_value = 0
 495 },
 496 {
 497         .access =       (SNDRV_CTL_ELEM_ACCESS_READWRITE |
 498                          SNDRV_CTL_ELEM_ACCESS_INACTIVE),
 499         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 500         .name =         SNDRV_CTL_NAME_IEC958("",PLAYBACK,PCM_STREAM),
 501         .info =         snd_cs8427_spdif_info,
 502         .get =          snd_cs8427_spdif_get,
 503         .put =          snd_cs8427_spdif_put,
 504         .private_value = 1
 505 },
 506 {
 507         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 508         .info =         snd_cs8427_qsubcode_info,
 509         .name =         "IEC958 Q-subcode Capture Default",
 510         .access =       (SNDRV_CTL_ELEM_ACCESS_READ |
 511                          SNDRV_CTL_ELEM_ACCESS_VOLATILE),
 512         .get =          snd_cs8427_qsubcode_get
 513 }};
 514 
 515 int snd_cs8427_iec958_build(struct snd_i2c_device *cs8427,
 516                             struct snd_pcm_substream *play_substream,
 517                             struct snd_pcm_substream *cap_substream)
 518 {
 519         struct cs8427 *chip = cs8427->private_data;
 520         struct snd_kcontrol *kctl;
 521         unsigned int idx;
 522         int err;
 523 
 524         if (snd_BUG_ON(!play_substream || !cap_substream))
 525                 return -EINVAL;
 526         for (idx = 0; idx < ARRAY_SIZE(snd_cs8427_iec958_controls); idx++) {
 527                 kctl = snd_ctl_new1(&snd_cs8427_iec958_controls[idx], cs8427);
 528                 if (kctl == NULL)
 529                         return -ENOMEM;
 530                 kctl->id.device = play_substream->pcm->device;
 531                 kctl->id.subdevice = play_substream->number;
 532                 err = snd_ctl_add(cs8427->bus->card, kctl);
 533                 if (err < 0)
 534                         return err;
 535                 if (! strcmp(kctl->id.name,
 536                              SNDRV_CTL_NAME_IEC958("",PLAYBACK,PCM_STREAM)))
 537                         chip->playback.pcm_ctl = kctl;
 538         }
 539 
 540         chip->playback.substream = play_substream;
 541         chip->capture.substream = cap_substream;
 542         if (snd_BUG_ON(!chip->playback.pcm_ctl))
 543                 return -EIO;
 544         return 0;
 545 }
 546 
 547 EXPORT_SYMBOL(snd_cs8427_iec958_build);
 548 
 549 int snd_cs8427_iec958_active(struct snd_i2c_device *cs8427, int active)
 550 {
 551         struct cs8427 *chip;
 552 
 553         if (snd_BUG_ON(!cs8427))
 554                 return -ENXIO;
 555         chip = cs8427->private_data;
 556         if (active)
 557                 memcpy(chip->playback.pcm_status,
 558                        chip->playback.def_status, 24);
 559         chip->playback.pcm_ctl->vd[0].access &= ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
 560         snd_ctl_notify(cs8427->bus->card,
 561                        SNDRV_CTL_EVENT_MASK_VALUE | SNDRV_CTL_EVENT_MASK_INFO,
 562                        &chip->playback.pcm_ctl->id);
 563         return 0;
 564 }
 565 
 566 EXPORT_SYMBOL(snd_cs8427_iec958_active);
 567 
 568 int snd_cs8427_iec958_pcm(struct snd_i2c_device *cs8427, unsigned int rate)
 569 {
 570         struct cs8427 *chip;
 571         char *status;
 572         int err, reset;
 573 
 574         if (snd_BUG_ON(!cs8427))
 575                 return -ENXIO;
 576         chip = cs8427->private_data;
 577         status = chip->playback.pcm_status;
 578         snd_i2c_lock(cs8427->bus);
 579         if (status[0] & IEC958_AES0_PROFESSIONAL) {
 580                 status[0] &= ~IEC958_AES0_PRO_FS;
 581                 switch (rate) {
 582                 case 32000: status[0] |= IEC958_AES0_PRO_FS_32000; break;
 583                 case 44100: status[0] |= IEC958_AES0_PRO_FS_44100; break;
 584                 case 48000: status[0] |= IEC958_AES0_PRO_FS_48000; break;
 585                 default: status[0] |= IEC958_AES0_PRO_FS_NOTID; break;
 586                 }
 587         } else {
 588                 status[3] &= ~IEC958_AES3_CON_FS;
 589                 switch (rate) {
 590                 case 32000: status[3] |= IEC958_AES3_CON_FS_32000; break;
 591                 case 44100: status[3] |= IEC958_AES3_CON_FS_44100; break;
 592                 case 48000: status[3] |= IEC958_AES3_CON_FS_48000; break;
 593                 }
 594         }
 595         err = snd_cs8427_send_corudata(cs8427, 0, status, 24);
 596         if (err > 0)
 597                 snd_ctl_notify(cs8427->bus->card,
 598                                SNDRV_CTL_EVENT_MASK_VALUE,
 599                                &chip->playback.pcm_ctl->id);
 600         reset = chip->rate != rate;
 601         chip->rate = rate;
 602         snd_i2c_unlock(cs8427->bus);
 603         if (reset)
 604                 snd_cs8427_reset(cs8427);
 605         return err < 0 ? err : 0;
 606 }
 607 
 608 EXPORT_SYMBOL(snd_cs8427_iec958_pcm);
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root/sound/i2c/cs8427.c

DEFINITIONS
