kernel/sound/i2c/other/ak4113.c

   1 /*
   2  *  Routines for control of the AK4113 via I2C/4-wire serial interface
   3  *  IEC958 (S/PDIF) receiver by Asahi Kasei
   4  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   5  *  Copyright (c) by Pavel Hofman <pavel.hofman@ivitera.com>
   6  *
   7  *
   8  *   This program is free software; you can redistribute it and/or modify
   9  *   it under the terms of the GNU General Public License as published by
  10  *   the Free Software Foundation; either version 2 of the License, or
  11  *   (at your option) any later version.
  12  *
  13  *   This program is distributed in the hope that it will be useful,
  14  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *   GNU General Public License for more details.
  17  *
  18  *   You should have received a copy of the GNU General Public License
  19  *   along with this program; if not, write to the Free Software
  20  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  21  *
  22  */
  23
  24 #include <linux/slab.h>
  25 #include <linux/delay.h>
  26 #include <linux/module.h>
  27 #include <sound/core.h>
  28 #include <sound/control.h>
  29 #include <sound/pcm.h>
  30 #include <sound/ak4113.h>
  31 #include <sound/asoundef.h>
  32 #include <sound/info.h>
  33
  34 MODULE_AUTHOR("Pavel Hofman <pavel.hofman@ivitera.com>");
  35 MODULE_DESCRIPTION("AK4113 IEC958 (S/PDIF) receiver by Asahi Kasei");
  36 MODULE_LICENSE("GPL");
  37
  38 #define AK4113_ADDR                     0x00 /* fixed address */
  39
  40 static void ak4113_stats(struct work_struct *work);
  41 static void ak4113_init_regs(struct ak4113 *chip);
  42
  43
  44 static void reg_write(struct ak4113 *ak4113, unsigned char reg,
  45                 unsigned char val)
  46 {
  47         ak4113->write(ak4113->private_data, reg, val);
  48         if (reg < sizeof(ak4113->regmap))
  49                 ak4113->regmap[reg] = val;
  50 }
  51
  52 static inline unsigned char reg_read(struct ak4113 *ak4113, unsigned char reg)
  53 {
  54         return ak4113->read(ak4113->private_data, reg);
  55 }
  56
  57 static void snd_ak4113_free(struct ak4113 *chip)
  58 {
  59         atomic_inc(&chip->wq_processing);       /* don't schedule new work */
  60         cancel_delayed_work_sync(&chip->work);
  61         kfree(chip);
  62 }
  63
  64 static int snd_ak4113_dev_free(struct snd_device *device)
  65 {
  66         struct ak4113 *chip = device->device_data;
  67         snd_ak4113_free(chip);
  68         return 0;
  69 }
  70
  71 int snd_ak4113_create(struct snd_card *card, ak4113_read_t *read,
  72                 ak4113_write_t *write, const unsigned char *pgm,
  73                 void *private_data, struct ak4113 **r_ak4113)
  74 {
  75         struct ak4113 *chip;
  76         int err;
  77         unsigned char reg;
  78         static struct snd_device_ops ops = {
  79                 .dev_free =     snd_ak4113_dev_free,
  80         };
  81
  82         chip = kzalloc(sizeof(*chip), GFP_KERNEL);
  83         if (chip == NULL)
  84                 return -ENOMEM;
  85         spin_lock_init(&chip->lock);
  86         chip->card = card;
  87         chip->read = read;
  88         chip->write = write;
  89         chip->private_data = private_data;
  90         INIT_DELAYED_WORK(&chip->work, ak4113_stats);
  91         atomic_set(&chip->wq_processing, 0);
  92         mutex_init(&chip->reinit_mutex);
  93
  94         for (reg = 0; reg < AK4113_WRITABLE_REGS ; reg++)
  95                 chip->regmap[reg] = pgm[reg];
  96         ak4113_init_regs(chip);
  97
  98         chip->rcs0 = reg_read(chip, AK4113_REG_RCS0) & ~(AK4113_QINT |
  99                         AK4113_CINT | AK4113_STC);
 100         chip->rcs1 = reg_read(chip, AK4113_REG_RCS1);
 101         chip->rcs2 = reg_read(chip, AK4113_REG_RCS2);
 102         err = snd_device_new(card, SNDRV_DEV_CODEC, chip, &ops);
 103         if (err < 0)
 104                 goto __fail;
 105
 106         if (r_ak4113)
 107                 *r_ak4113 = chip;
 108         return 0;
 109
 110 __fail:
 111         snd_ak4113_free(chip);
 112         return err;
 113 }
 114 EXPORT_SYMBOL_GPL(snd_ak4113_create);
 115
 116 void snd_ak4113_reg_write(struct ak4113 *chip, unsigned char reg,
 117                 unsigned char mask, unsigned char val)
 118 {
 119         if (reg >= AK4113_WRITABLE_REGS)
 120                 return;
 121         reg_write(chip, reg, (chip->regmap[reg] & ~mask) | val);
 122 }
 123 EXPORT_SYMBOL_GPL(snd_ak4113_reg_write);
 124
 125 static void ak4113_init_regs(struct ak4113 *chip)
 126 {
 127         unsigned char old = chip->regmap[AK4113_REG_PWRDN], reg;
 128
 129         /* bring the chip to reset state and powerdown state */
 130         reg_write(chip, AK4113_REG_PWRDN, old & ~(AK4113_RST|AK4113_PWN));
 131         udelay(200);
 132         /* release reset, but leave powerdown */
 133         reg_write(chip, AK4113_REG_PWRDN, (old | AK4113_RST) & ~AK4113_PWN);
 134         udelay(200);
 135         for (reg = 1; reg < AK4113_WRITABLE_REGS; reg++)
 136                 reg_write(chip, reg, chip->regmap[reg]);
 137         /* release powerdown, everything is initialized now */
 138         reg_write(chip, AK4113_REG_PWRDN, old | AK4113_RST | AK4113_PWN);
 139 }
 140
 141 void snd_ak4113_reinit(struct ak4113 *chip)
 142 {
 143         if (atomic_inc_return(&chip->wq_processing) == 1)
 144                 cancel_delayed_work_sync(&chip->work);
 145         mutex_lock(&chip->reinit_mutex);
 146         ak4113_init_regs(chip);
 147         mutex_unlock(&chip->reinit_mutex);
 148         /* bring up statistics / event queing */
 149         if (atomic_dec_and_test(&chip->wq_processing))
 150                 schedule_delayed_work(&chip->work, HZ / 10);
 151 }
 152 EXPORT_SYMBOL_GPL(snd_ak4113_reinit);
 153
 154 static unsigned int external_rate(unsigned char rcs1)
 155 {
 156         switch (rcs1 & (AK4113_FS0|AK4113_FS1|AK4113_FS2|AK4113_FS3)) {
 157         case AK4113_FS_8000HZ:
 158                 return 8000;
 159         case AK4113_FS_11025HZ:
 160                 return 11025;
 161         case AK4113_FS_16000HZ:
 162                 return 16000;
 163         case AK4113_FS_22050HZ:
 164                 return 22050;
 165         case AK4113_FS_24000HZ:
 166                 return 24000;
 167         case AK4113_FS_32000HZ:
 168                 return 32000;
 169         case AK4113_FS_44100HZ:
 170                 return 44100;
 171         case AK4113_FS_48000HZ:
 172                 return 48000;
 173         case AK4113_FS_64000HZ:
 174                 return 64000;
 175         case AK4113_FS_88200HZ:
 176                 return 88200;
 177         case AK4113_FS_96000HZ:
 178                 return 96000;
 179         case AK4113_FS_176400HZ:
 180                 return 176400;
 181         case AK4113_FS_192000HZ:
 182                 return 192000;
 183         default:
 184                 return 0;
 185         }
 186 }
 187
 188 static int snd_ak4113_in_error_info(struct snd_kcontrol *kcontrol,
 189                                     struct snd_ctl_elem_info *uinfo)
 190 {
 191         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 192         uinfo->count = 1;
 193         uinfo->value.integer.min = 0;
 194         uinfo->value.integer.max = LONG_MAX;
 195         return 0;
 196 }
 197
 198 static int snd_ak4113_in_error_get(struct snd_kcontrol *kcontrol,
 199                                    struct snd_ctl_elem_value *ucontrol)
 200 {
 201         struct ak4113 *chip = snd_kcontrol_chip(kcontrol);
 202         long *ptr;
 203
 204         spin_lock_irq(&chip->lock);
 205         ptr = (long *)(((char *)chip) + kcontrol->private_value);
 206         ucontrol->value.integer.value[0] = *ptr;
 207         *ptr = 0;
 208         spin_unlock_irq(&chip->lock);
 209         return 0;
 210 }
 211
 212 #define snd_ak4113_in_bit_info          snd_ctl_boolean_mono_info
 213
 214 static int snd_ak4113_in_bit_get(struct snd_kcontrol *kcontrol,
 215                                  struct snd_ctl_elem_value *ucontrol)
 216 {
 217         struct ak4113 *chip = snd_kcontrol_chip(kcontrol);
 218         unsigned char reg = kcontrol->private_value & 0xff;
 219         unsigned char bit = (kcontrol->private_value >> 8) & 0xff;
 220         unsigned char inv = (kcontrol->private_value >> 31) & 1;
 221
 222         ucontrol->value.integer.value[0] =
 223                 ((reg_read(chip, reg) & (1 << bit)) ? 1 : 0) ^ inv;
 224         return 0;
 225 }
 226
 227 static int snd_ak4113_rx_info(struct snd_kcontrol *kcontrol,
 228                               struct snd_ctl_elem_info *uinfo)
 229 {
 230         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 231         uinfo->count = 1;
 232         uinfo->value.integer.min = 0;
 233         uinfo->value.integer.max = 5;
 234         return 0;
 235 }
 236
 237 static int snd_ak4113_rx_get(struct snd_kcontrol *kcontrol,
 238                              struct snd_ctl_elem_value *ucontrol)
 239 {
 240         struct ak4113 *chip = snd_kcontrol_chip(kcontrol);
 241
 242         ucontrol->value.integer.value[0] =
 243                 (AK4113_IPS(chip->regmap[AK4113_REG_IO1]));
 244         return 0;
 245 }
 246
 247 static int snd_ak4113_rx_put(struct snd_kcontrol *kcontrol,
 248                              struct snd_ctl_elem_value *ucontrol)
 249 {
 250         struct ak4113 *chip = snd_kcontrol_chip(kcontrol);
 251         int change;
 252         u8 old_val;
 253
 254         spin_lock_irq(&chip->lock);
 255         old_val = chip->regmap[AK4113_REG_IO1];
 256         change = ucontrol->value.integer.value[0] != AK4113_IPS(old_val);
 257         if (change)
 258                 reg_write(chip, AK4113_REG_IO1,
 259                                 (old_val & (~AK4113_IPS(0xff))) |
 260                                 (AK4113_IPS(ucontrol->value.integer.value[0])));
 261         spin_unlock_irq(&chip->lock);
 262         return change;
 263 }
 264
 265 static int snd_ak4113_rate_info(struct snd_kcontrol *kcontrol,
 266                                 struct snd_ctl_elem_info *uinfo)
 267 {
 268         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 269         uinfo->count = 1;
 270         uinfo->value.integer.min = 0;
 271         uinfo->value.integer.max = 192000;
 272         return 0;
 273 }
 274
 275 static int snd_ak4113_rate_get(struct snd_kcontrol *kcontrol,
 276                                struct snd_ctl_elem_value *ucontrol)
 277 {
 278         struct ak4113 *chip = snd_kcontrol_chip(kcontrol);
 279
 280         ucontrol->value.integer.value[0] = external_rate(reg_read(chip,
 281                                 AK4113_REG_RCS1));
 282         return 0;
 283 }
 284
 285 static int snd_ak4113_spdif_info(struct snd_kcontrol *kcontrol,
 286                 struct snd_ctl_elem_info *uinfo)
 287 {
 288         uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
 289         uinfo->count = 1;
 290         return 0;
 291 }
 292
 293 static int snd_ak4113_spdif_get(struct snd_kcontrol *kcontrol,
 294                                 struct snd_ctl_elem_value *ucontrol)
 295 {
 296         struct ak4113 *chip = snd_kcontrol_chip(kcontrol);
 297         unsigned i;
 298
 299         for (i = 0; i < AK4113_REG_RXCSB_SIZE; i++)
 300                 ucontrol->value.iec958.status[i] = reg_read(chip,
 301                                 AK4113_REG_RXCSB0 + i);
 302         return 0;
 303 }
 304
 305 static int snd_ak4113_spdif_mask_info(struct snd_kcontrol *kcontrol,
 306                 struct snd_ctl_elem_info *uinfo)
 307 {
 308         uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
 309         uinfo->count = 1;
 310         return 0;
 311 }
 312
 313 static int snd_ak4113_spdif_mask_get(struct snd_kcontrol *kcontrol,
 314                                       struct snd_ctl_elem_value *ucontrol)
 315 {
 316         memset(ucontrol->value.iec958.status, 0xff, AK4113_REG_RXCSB_SIZE);
 317         return 0;
 318 }
 319
 320 static int snd_ak4113_spdif_pinfo(struct snd_kcontrol *kcontrol,
 321                 struct snd_ctl_elem_info *uinfo)
 322 {
 323         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 324         uinfo->value.integer.min = 0;
 325         uinfo->value.integer.max = 0xffff;
 326         uinfo->count = 4;
 327         return 0;
 328 }
 329
 330 static int snd_ak4113_spdif_pget(struct snd_kcontrol *kcontrol,
 331                                  struct snd_ctl_elem_value *ucontrol)
 332 {
 333         struct ak4113 *chip = snd_kcontrol_chip(kcontrol);
 334         unsigned short tmp;
 335
 336         ucontrol->value.integer.value[0] = 0xf8f2;
 337         ucontrol->value.integer.value[1] = 0x4e1f;
 338         tmp = reg_read(chip, AK4113_REG_Pc0) |
 339                 (reg_read(chip, AK4113_REG_Pc1) << 8);
 340         ucontrol->value.integer.value[2] = tmp;
 341         tmp = reg_read(chip, AK4113_REG_Pd0) |
 342                 (reg_read(chip, AK4113_REG_Pd1) << 8);
 343         ucontrol->value.integer.value[3] = tmp;
 344         return 0;
 345 }
 346
 347 static int snd_ak4113_spdif_qinfo(struct snd_kcontrol *kcontrol,
 348                 struct snd_ctl_elem_info *uinfo)
 349 {
 350         uinfo->type = SNDRV_CTL_ELEM_TYPE_BYTES;
 351         uinfo->count = AK4113_REG_QSUB_SIZE;
 352         return 0;
 353 }
 354
 355 static int snd_ak4113_spdif_qget(struct snd_kcontrol *kcontrol,
 356                                  struct snd_ctl_elem_value *ucontrol)
 357 {
 358         struct ak4113 *chip = snd_kcontrol_chip(kcontrol);
 359         unsigned i;
 360
 361         for (i = 0; i < AK4113_REG_QSUB_SIZE; i++)
 362                 ucontrol->value.bytes.data[i] = reg_read(chip,
 363                                 AK4113_REG_QSUB_ADDR + i);
 364         return 0;
 365 }
 366
 367 /* Don't forget to change AK4113_CONTROLS define!!! */
 368 static struct snd_kcontrol_new snd_ak4113_iec958_controls[] = {
 369 {
 370         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 371         .name =         "IEC958 Parity Errors",
 372         .access =       SNDRV_CTL_ELEM_ACCESS_READ |
 373                 SNDRV_CTL_ELEM_ACCESS_VOLATILE,
 374         .info =         snd_ak4113_in_error_info,
 375         .get =          snd_ak4113_in_error_get,
 376         .private_value = offsetof(struct ak4113, parity_errors),
 377 },
 378 {
 379         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 380         .name =         "IEC958 V-Bit Errors",
 381         .access =       SNDRV_CTL_ELEM_ACCESS_READ |
 382                 SNDRV_CTL_ELEM_ACCESS_VOLATILE,
 383         .info =         snd_ak4113_in_error_info,
 384         .get =          snd_ak4113_in_error_get,
 385         .private_value = offsetof(struct ak4113, v_bit_errors),
 386 },
 387 {
 388         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 389         .name =         "IEC958 C-CRC Errors",
 390         .access =       SNDRV_CTL_ELEM_ACCESS_READ |
 391                 SNDRV_CTL_ELEM_ACCESS_VOLATILE,
 392         .info =         snd_ak4113_in_error_info,
 393         .get =          snd_ak4113_in_error_get,
 394         .private_value = offsetof(struct ak4113, ccrc_errors),
 395 },
 396 {
 397         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 398         .name =         "IEC958 Q-CRC Errors",
 399         .access =       SNDRV_CTL_ELEM_ACCESS_READ |
 400                 SNDRV_CTL_ELEM_ACCESS_VOLATILE,
 401         .info =         snd_ak4113_in_error_info,
 402         .get =          snd_ak4113_in_error_get,
 403         .private_value = offsetof(struct ak4113, qcrc_errors),
 404 },
 405 {
 406         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 407         .name =         "IEC958 External Rate",
 408         .access =       SNDRV_CTL_ELEM_ACCESS_READ |
 409                 SNDRV_CTL_ELEM_ACCESS_VOLATILE,
 410         .info =         snd_ak4113_rate_info,
 411         .get =          snd_ak4113_rate_get,
 412 },
 413 {
 414         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 415         .name =         SNDRV_CTL_NAME_IEC958("", CAPTURE, MASK),
 416         .access =       SNDRV_CTL_ELEM_ACCESS_READ,
 417         .info =         snd_ak4113_spdif_mask_info,
 418         .get =          snd_ak4113_spdif_mask_get,
 419 },
 420 {
 421         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 422         .name =         SNDRV_CTL_NAME_IEC958("", CAPTURE, DEFAULT),
 423         .access =       SNDRV_CTL_ELEM_ACCESS_READ |
 424                 SNDRV_CTL_ELEM_ACCESS_VOLATILE,
 425         .info =         snd_ak4113_spdif_info,
 426         .get =          snd_ak4113_spdif_get,
 427 },
 428 {
 429         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 430         .name =         "IEC958 Preamble Capture Default",
 431         .access =       SNDRV_CTL_ELEM_ACCESS_READ |
 432                 SNDRV_CTL_ELEM_ACCESS_VOLATILE,
 433         .info =         snd_ak4113_spdif_pinfo,
 434         .get =          snd_ak4113_spdif_pget,
 435 },
 436 {
 437         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 438         .name =         "IEC958 Q-subcode Capture Default",
 439         .access =       SNDRV_CTL_ELEM_ACCESS_READ |
 440                 SNDRV_CTL_ELEM_ACCESS_VOLATILE,
 441         .info =         snd_ak4113_spdif_qinfo,
 442         .get =          snd_ak4113_spdif_qget,
 443 },
 444 {
 445         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 446         .name =         "IEC958 Audio",
 447         .access =       SNDRV_CTL_ELEM_ACCESS_READ |
 448                 SNDRV_CTL_ELEM_ACCESS_VOLATILE,
 449         .info =         snd_ak4113_in_bit_info,
 450         .get =          snd_ak4113_in_bit_get,
 451         .private_value = (1<<31) | (1<<8) | AK4113_REG_RCS0,
 452 },
 453 {
 454         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 455         .name =         "IEC958 Non-PCM Bitstream",
 456         .access =       SNDRV_CTL_ELEM_ACCESS_READ |
 457                 SNDRV_CTL_ELEM_ACCESS_VOLATILE,
 458         .info =         snd_ak4113_in_bit_info,
 459         .get =          snd_ak4113_in_bit_get,
 460         .private_value = (0<<8) | AK4113_REG_RCS1,
 461 },
 462 {
 463         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 464         .name =         "IEC958 DTS Bitstream",
 465         .access =       SNDRV_CTL_ELEM_ACCESS_READ |
 466                 SNDRV_CTL_ELEM_ACCESS_VOLATILE,
 467         .info =         snd_ak4113_in_bit_info,
 468         .get =          snd_ak4113_in_bit_get,
 469         .private_value = (1<<8) | AK4113_REG_RCS1,
 470 },
 471 {
 472         .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 473         .name =         "AK4113 Input Select",
 474         .access =       SNDRV_CTL_ELEM_ACCESS_READ |
 475                 SNDRV_CTL_ELEM_ACCESS_WRITE,
 476         .info =         snd_ak4113_rx_info,
 477         .get =          snd_ak4113_rx_get,
 478         .put =          snd_ak4113_rx_put,
 479 }
 480 };
 481
 482 static void snd_ak4113_proc_regs_read(struct snd_info_entry *entry,
 483                 struct snd_info_buffer *buffer)
 484 {
 485         struct ak4113 *ak4113 = entry->private_data;
 486         int reg, val;
 487         /* all ak4113 registers 0x00 - 0x1c */
 488         for (reg = 0; reg < 0x1d; reg++) {
 489                 val = reg_read(ak4113, reg);
 490                 snd_iprintf(buffer, "0x%02x = 0x%02x\n", reg, val);
 491         }
 492 }
 493
 494 static void snd_ak4113_proc_init(struct ak4113 *ak4113)
 495 {
 496         struct snd_info_entry *entry;
 497         if (!snd_card_proc_new(ak4113->card, "ak4113", &entry))
 498                 snd_info_set_text_ops(entry, ak4113, snd_ak4113_proc_regs_read);
 499 }
 500
 501 int snd_ak4113_build(struct ak4113 *ak4113,
 502                 struct snd_pcm_substream *cap_substream)
 503 {
 504         struct snd_kcontrol *kctl;
 505         unsigned int idx;
 506         int err;
 507
 508         if (snd_BUG_ON(!cap_substream))
 509                 return -EINVAL;
 510         ak4113->substream = cap_substream;
 511         for (idx = 0; idx < AK4113_CONTROLS; idx++) {
 512                 kctl = snd_ctl_new1(&snd_ak4113_iec958_controls[idx], ak4113);
 513                 if (kctl == NULL)
 514                         return -ENOMEM;
 515                 kctl->id.device = cap_substream->pcm->device;
 516                 kctl->id.subdevice = cap_substream->number;
 517                 err = snd_ctl_add(ak4113->card, kctl);
 518                 if (err < 0)
 519                         return err;
 520                 ak4113->kctls[idx] = kctl;
 521         }
 522         snd_ak4113_proc_init(ak4113);
 523         /* trigger workq */
 524         schedule_delayed_work(&ak4113->work, HZ / 10);
 525         return 0;
 526 }
 527 EXPORT_SYMBOL_GPL(snd_ak4113_build);
 528
 529 int snd_ak4113_external_rate(struct ak4113 *ak4113)
 530 {
 531         unsigned char rcs1;
 532
 533         rcs1 = reg_read(ak4113, AK4113_REG_RCS1);
 534         return external_rate(rcs1);
 535 }
 536 EXPORT_SYMBOL_GPL(snd_ak4113_external_rate);
 537
 538 int snd_ak4113_check_rate_and_errors(struct ak4113 *ak4113, unsigned int flags)
 539 {
 540         struct snd_pcm_runtime *runtime =
 541                 ak4113->substream ? ak4113->substream->runtime : NULL;
 542         unsigned long _flags;
 543         int res = 0;
 544         unsigned char rcs0, rcs1, rcs2;
 545         unsigned char c0, c1;
 546
 547         rcs1 = reg_read(ak4113, AK4113_REG_RCS1);
 548         if (flags & AK4113_CHECK_NO_STAT)
 549                 goto __rate;
 550         rcs0 = reg_read(ak4113, AK4113_REG_RCS0);
 551         rcs2 = reg_read(ak4113, AK4113_REG_RCS2);
 552         spin_lock_irqsave(&ak4113->lock, _flags);
 553         if (rcs0 & AK4113_PAR)
 554                 ak4113->parity_errors++;
 555         if (rcs0 & AK4113_V)
 556                 ak4113->v_bit_errors++;
 557         if (rcs2 & AK4113_CCRC)
 558                 ak4113->ccrc_errors++;
 559         if (rcs2 & AK4113_QCRC)
 560                 ak4113->qcrc_errors++;
 561         c0 = (ak4113->rcs0 & (AK4113_QINT | AK4113_CINT | AK4113_STC |
 562                                 AK4113_AUDION | AK4113_AUTO | AK4113_UNLCK)) ^
 563                 (rcs0 & (AK4113_QINT | AK4113_CINT | AK4113_STC |
 564                          AK4113_AUDION | AK4113_AUTO | AK4113_UNLCK));
 565         c1 = (ak4113->rcs1 & (AK4113_DTSCD | AK4113_NPCM | AK4113_PEM |
 566                                 AK4113_DAT | 0xf0)) ^
 567                 (rcs1 & (AK4113_DTSCD | AK4113_NPCM | AK4113_PEM |
 568                          AK4113_DAT | 0xf0));
 569         ak4113->rcs0 = rcs0 & ~(AK4113_QINT | AK4113_CINT | AK4113_STC);
 570         ak4113->rcs1 = rcs1;
 571         ak4113->rcs2 = rcs2;
 572         spin_unlock_irqrestore(&ak4113->lock, _flags);
 573
 574         if (rcs0 & AK4113_PAR)
 575                 snd_ctl_notify(ak4113->card, SNDRV_CTL_EVENT_MASK_VALUE,
 576                                 &ak4113->kctls[0]->id);
 577         if (rcs0 & AK4113_V)
 578                 snd_ctl_notify(ak4113->card, SNDRV_CTL_EVENT_MASK_VALUE,
 579                                 &ak4113->kctls[1]->id);
 580         if (rcs2 & AK4113_CCRC)
 581                 snd_ctl_notify(ak4113->card, SNDRV_CTL_EVENT_MASK_VALUE,
 582                                 &ak4113->kctls[2]->id);
 583         if (rcs2 & AK4113_QCRC)
 584                 snd_ctl_notify(ak4113->card, SNDRV_CTL_EVENT_MASK_VALUE,
 585                                 &ak4113->kctls[3]->id);
 586
 587         /* rate change */
 588         if (c1 & 0xf0)
 589                 snd_ctl_notify(ak4113->card, SNDRV_CTL_EVENT_MASK_VALUE,
 590                                 &ak4113->kctls[4]->id);
 591
 592         if ((c1 & AK4113_PEM) | (c0 & AK4113_CINT))
 593                 snd_ctl_notify(ak4113->card, SNDRV_CTL_EVENT_MASK_VALUE,
 594                                 &ak4113->kctls[6]->id);
 595         if (c0 & AK4113_QINT)
 596                 snd_ctl_notify(ak4113->card, SNDRV_CTL_EVENT_MASK_VALUE,
 597                                 &ak4113->kctls[8]->id);
 598
 599         if (c0 & AK4113_AUDION)
 600                 snd_ctl_notify(ak4113->card, SNDRV_CTL_EVENT_MASK_VALUE,
 601                                 &ak4113->kctls[9]->id);
 602         if (c1 & AK4113_NPCM)
 603                 snd_ctl_notify(ak4113->card, SNDRV_CTL_EVENT_MASK_VALUE,
 604                                 &ak4113->kctls[10]->id);
 605         if (c1 & AK4113_DTSCD)
 606                 snd_ctl_notify(ak4113->card, SNDRV_CTL_EVENT_MASK_VALUE,
 607                                 &ak4113->kctls[11]->id);
 608
 609         if (ak4113->change_callback && (c0 | c1) != 0)
 610                 ak4113->change_callback(ak4113, c0, c1);
 611
 612 __rate:
 613         /* compare rate */
 614         res = external_rate(rcs1);
 615         if (!(flags & AK4113_CHECK_NO_RATE) && runtime &&
 616                         (runtime->rate != res)) {
 617                 snd_pcm_stream_lock_irqsave(ak4113->substream, _flags);
 618                 if (snd_pcm_running(ak4113->substream)) {
 619                         /*printk(KERN_DEBUG "rate changed (%i <- %i)\n",
 620                          * runtime->rate, res); */
 621                         snd_pcm_stop(ak4113->substream,
 622                                         SNDRV_PCM_STATE_DRAINING);
 623                         wake_up(&runtime->sleep);
 624                         res = 1;
 625                 }
 626                 snd_pcm_stream_unlock_irqrestore(ak4113->substream, _flags);
 627         }
 628         return res;
 629 }
 630 EXPORT_SYMBOL_GPL(snd_ak4113_check_rate_and_errors);
 631
 632 static void ak4113_stats(struct work_struct *work)
 633 {
 634         struct ak4113 *chip = container_of(work, struct ak4113, work.work);
 635
 636         if (atomic_inc_return(&chip->wq_processing) == 1)
 637                 snd_ak4113_check_rate_and_errors(chip, chip->check_flags);
 638
 639         if (atomic_dec_and_test(&chip->wq_processing))
 640                 schedule_delayed_work(&chip->work, HZ / 10);
 641 }
 642
 643 #ifdef CONFIG_PM
 644 void snd_ak4113_suspend(struct ak4113 *chip)
 645 {
 646         atomic_inc(&chip->wq_processing); /* don't schedule new work */
 647         cancel_delayed_work_sync(&chip->work);
 648 }
 649 EXPORT_SYMBOL(snd_ak4113_suspend);
 650
 651 void snd_ak4113_resume(struct ak4113 *chip)
 652 {
 653         atomic_dec(&chip->wq_processing);
 654         snd_ak4113_reinit(chip);
 655 }
 656 EXPORT_SYMBOL(snd_ak4113_resume);
 657 #endif