sound/firewire/isight.c

   1 /*
   2  * Apple iSight audio driver
   3  *
   4  * Copyright (c) Clemens Ladisch <clemens@ladisch.de>
   5  * Licensed under the terms of the GNU General Public License, version 2.
   6  */
   7
   8 #include <asm/byteorder.h>
   9 #include <linux/delay.h>
  10 #include <linux/device.h>
  11 #include <linux/firewire.h>
  12 #include <linux/firewire-constants.h>
  13 #include <linux/module.h>
  14 #include <linux/mod_devicetable.h>
  15 #include <linux/mutex.h>
  16 #include <linux/string.h>
  17 #include <sound/control.h>
  18 #include <sound/core.h>
  19 #include <sound/initval.h>
  20 #include <sound/pcm.h>
  21 #include <sound/tlv.h>
  22 #include "lib.h"
  23 #include "iso-resources.h"
  24 #include "packets-buffer.h"
  25
  26 #define OUI_APPLE               0x000a27
  27 #define MODEL_APPLE_ISIGHT      0x000008
  28 #define SW_ISIGHT_AUDIO         0x000010
  29
  30 #define REG_AUDIO_ENABLE        0x000
  31 #define  AUDIO_ENABLE           0x80000000
  32 #define REG_DEF_AUDIO_GAIN      0x204
  33 #define REG_GAIN_RAW_START      0x210
  34 #define REG_GAIN_RAW_END        0x214
  35 #define REG_GAIN_DB_START       0x218
  36 #define REG_GAIN_DB_END         0x21c
  37 #define REG_SAMPLE_RATE_INQUIRY 0x280
  38 #define REG_ISO_TX_CONFIG       0x300
  39 #define  SPEED_SHIFT            16
  40 #define REG_SAMPLE_RATE         0x400
  41 #define  RATE_48000             0x80000000
  42 #define REG_GAIN                0x500
  43 #define REG_MUTE                0x504
  44
  45 #define MAX_FRAMES_PER_PACKET   475
  46
  47 #define QUEUE_LENGTH            20
  48
  49 struct isight {
  50         struct snd_card *card;
  51         struct fw_unit *unit;
  52         struct fw_device *device;
  53         u64 audio_base;
  54         struct snd_pcm_substream *pcm;
  55         struct mutex mutex;
  56         struct iso_packets_buffer buffer;
  57         struct fw_iso_resources resources;
  58         struct fw_iso_context *context;
  59         bool pcm_active;
  60         bool pcm_running;
  61         bool first_packet;
  62         int packet_index;
  63         u32 total_samples;
  64         unsigned int buffer_pointer;
  65         unsigned int period_counter;
  66         s32 gain_min, gain_max;
  67         unsigned int gain_tlv[4];
  68 };
  69
  70 struct audio_payload {
  71         __be32 sample_count;
  72         __be32 signature;
  73         __be32 sample_total;
  74         __be32 reserved;
  75         __be16 samples[2 * MAX_FRAMES_PER_PACKET];
  76 };
  77
  78 MODULE_DESCRIPTION("iSight audio driver");
  79 MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>");
  80 MODULE_LICENSE("GPL v2");
  81
  82 static struct fw_iso_packet audio_packet = {
  83         .payload_length = sizeof(struct audio_payload),
  84         .interrupt = 1,
  85         .header_length = 4,
  86 };
  87
  88 static void isight_update_pointers(struct isight *isight, unsigned int count)
  89 {
  90         struct snd_pcm_runtime *runtime = isight->pcm->runtime;
  91         unsigned int ptr;
  92
  93         smp_wmb(); /* update buffer data before buffer pointer */
  94
  95         ptr = isight->buffer_pointer;
  96         ptr += count;
  97         if (ptr >= runtime->buffer_size)
  98                 ptr -= runtime->buffer_size;
  99         ACCESS_ONCE(isight->buffer_pointer) = ptr;
 100
 101         isight->period_counter += count;
 102         if (isight->period_counter >= runtime->period_size) {
 103                 isight->period_counter -= runtime->period_size;
 104                 snd_pcm_period_elapsed(isight->pcm);
 105         }
 106 }
 107
 108 static void isight_samples(struct isight *isight,
 109                            const __be16 *samples, unsigned int count)
 110 {
 111         struct snd_pcm_runtime *runtime;
 112         unsigned int count1;
 113
 114         if (!ACCESS_ONCE(isight->pcm_running))
 115                 return;
 116
 117         runtime = isight->pcm->runtime;
 118         if (isight->buffer_pointer + count <= runtime->buffer_size) {
 119                 memcpy(runtime->dma_area + isight->buffer_pointer * 4,
 120                        samples, count * 4);
 121         } else {
 122                 count1 = runtime->buffer_size - isight->buffer_pointer;
 123                 memcpy(runtime->dma_area + isight->buffer_pointer * 4,
 124                        samples, count1 * 4);
 125                 samples += count1 * 2;
 126                 memcpy(runtime->dma_area, samples, (count - count1) * 4);
 127         }
 128
 129         isight_update_pointers(isight, count);
 130 }
 131
 132 static void isight_pcm_abort(struct isight *isight)
 133 {
 134         unsigned long flags;
 135
 136         if (ACCESS_ONCE(isight->pcm_active)) {
 137                 snd_pcm_stream_lock_irqsave(isight->pcm, flags);
 138                 if (snd_pcm_running(isight->pcm))
 139                         snd_pcm_stop(isight->pcm, SNDRV_PCM_STATE_XRUN);
 140                 snd_pcm_stream_unlock_irqrestore(isight->pcm, flags);
 141         }
 142 }
 143
 144 static void isight_dropped_samples(struct isight *isight, unsigned int total)
 145 {
 146         struct snd_pcm_runtime *runtime;
 147         u32 dropped;
 148         unsigned int count1;
 149
 150         if (!ACCESS_ONCE(isight->pcm_running))
 151                 return;
 152
 153         runtime = isight->pcm->runtime;
 154         dropped = total - isight->total_samples;
 155         if (dropped < runtime->buffer_size) {
 156                 if (isight->buffer_pointer + dropped <= runtime->buffer_size) {
 157                         memset(runtime->dma_area + isight->buffer_pointer * 4,
 158                                0, dropped * 4);
 159                 } else {
 160                         count1 = runtime->buffer_size - isight->buffer_pointer;
 161                         memset(runtime->dma_area + isight->buffer_pointer * 4,
 162                                0, count1 * 4);
 163                         memset(runtime->dma_area, 0, (dropped - count1) * 4);
 164                 }
 165                 isight_update_pointers(isight, dropped);
 166         } else {
 167                 isight_pcm_abort(isight);
 168         }
 169 }
 170
 171 static void isight_packet(struct fw_iso_context *context, u32 cycle,
 172                           size_t header_length, void *header, void *data)
 173 {
 174         struct isight *isight = data;
 175         const struct audio_payload *payload;
 176         unsigned int index, length, count, total;
 177         int err;
 178
 179         if (isight->packet_index < 0)
 180                 return;
 181         index = isight->packet_index;
 182         payload = isight->buffer.packets[index].buffer;
 183         length = be32_to_cpup(header) >> 16;
 184
 185         if (likely(length >= 16 &&
 186                    payload->signature == cpu_to_be32(0x73676874/*"sght"*/))) {
 187                 count = be32_to_cpu(payload->sample_count);
 188                 if (likely(count <= (length - 16) / 4)) {
 189                         total = be32_to_cpu(payload->sample_total);
 190                         if (unlikely(total != isight->total_samples)) {
 191                                 if (!isight->first_packet)
 192                                         isight_dropped_samples(isight, total);
 193                                 isight->first_packet = false;
 194                                 isight->total_samples = total;
 195                         }
 196
 197                         isight_samples(isight, payload->samples, count);
 198                         isight->total_samples += count;
 199                 }
 200         }
 201
 202         err = fw_iso_context_queue(isight->context, &audio_packet,
 203                                    &isight->buffer.iso_buffer,
 204                                    isight->buffer.packets[index].offset);
 205         if (err < 0) {
 206                 dev_err(&isight->unit->device, "queueing error: %d\n", err);
 207                 isight_pcm_abort(isight);
 208                 isight->packet_index = -1;
 209                 return;
 210         }
 211         fw_iso_context_queue_flush(isight->context);
 212
 213         if (++index >= QUEUE_LENGTH)
 214                 index = 0;
 215         isight->packet_index = index;
 216 }
 217
 218 static int isight_connect(struct isight *isight)
 219 {
 220         int ch, err;
 221         __be32 value;
 222
 223 retry_after_bus_reset:
 224         ch = fw_iso_resources_allocate(&isight->resources,
 225                                        sizeof(struct audio_payload),
 226                                        isight->device->max_speed);
 227         if (ch < 0) {
 228                 err = ch;
 229                 goto error;
 230         }
 231
 232         value = cpu_to_be32(ch | (isight->device->max_speed << SPEED_SHIFT));
 233         err = snd_fw_transaction(isight->unit, TCODE_WRITE_QUADLET_REQUEST,
 234                                  isight->audio_base + REG_ISO_TX_CONFIG,
 235                                  &value, 4, FW_FIXED_GENERATION |
 236                                  isight->resources.generation);
 237         if (err == -EAGAIN) {
 238                 fw_iso_resources_free(&isight->resources);
 239                 goto retry_after_bus_reset;
 240         } else if (err < 0) {
 241                 goto err_resources;
 242         }
 243
 244         return 0;
 245
 246 err_resources:
 247         fw_iso_resources_free(&isight->resources);
 248 error:
 249         return err;
 250 }
 251
 252 static int isight_open(struct snd_pcm_substream *substream)
 253 {
 254         static const struct snd_pcm_hardware hardware = {
 255                 .info = SNDRV_PCM_INFO_MMAP |
 256                         SNDRV_PCM_INFO_MMAP_VALID |
 257                         SNDRV_PCM_INFO_BATCH |
 258                         SNDRV_PCM_INFO_INTERLEAVED |
 259                         SNDRV_PCM_INFO_BLOCK_TRANSFER,
 260                 .formats = SNDRV_PCM_FMTBIT_S16_BE,
 261                 .rates = SNDRV_PCM_RATE_48000,
 262                 .rate_min = 48000,
 263                 .rate_max = 48000,
 264                 .channels_min = 2,
 265                 .channels_max = 2,
 266                 .buffer_bytes_max = 4 * 1024 * 1024,
 267                 .period_bytes_min = MAX_FRAMES_PER_PACKET * 4,
 268                 .period_bytes_max = 1024 * 1024,
 269                 .periods_min = 2,
 270                 .periods_max = UINT_MAX,
 271         };
 272         struct isight *isight = substream->private_data;
 273
 274         substream->runtime->hw = hardware;
 275
 276         return iso_packets_buffer_init(&isight->buffer, isight->unit,
 277                                        QUEUE_LENGTH,
 278                                        sizeof(struct audio_payload),
 279                                        DMA_FROM_DEVICE);
 280 }
 281
 282 static int isight_close(struct snd_pcm_substream *substream)
 283 {
 284         struct isight *isight = substream->private_data;
 285
 286         iso_packets_buffer_destroy(&isight->buffer, isight->unit);
 287
 288         return 0;
 289 }
 290
 291 static int isight_hw_params(struct snd_pcm_substream *substream,
 292                             struct snd_pcm_hw_params *hw_params)
 293 {
 294         struct isight *isight = substream->private_data;
 295         int err;
 296
 297         err = snd_pcm_lib_alloc_vmalloc_buffer(substream,
 298                                                params_buffer_bytes(hw_params));
 299         if (err < 0)
 300                 return err;
 301
 302         ACCESS_ONCE(isight->pcm_active) = true;
 303
 304         return 0;
 305 }
 306
 307 static int reg_read(struct isight *isight, int offset, __be32 *value)
 308 {
 309         return snd_fw_transaction(isight->unit, TCODE_READ_QUADLET_REQUEST,
 310                                   isight->audio_base + offset, value, 4, 0);
 311 }
 312
 313 static int reg_write(struct isight *isight, int offset, __be32 value)
 314 {
 315         return snd_fw_transaction(isight->unit, TCODE_WRITE_QUADLET_REQUEST,
 316                                   isight->audio_base + offset, &value, 4, 0);
 317 }
 318
 319 static void isight_stop_streaming(struct isight *isight)
 320 {
 321         __be32 value;
 322
 323         if (!isight->context)
 324                 return;
 325
 326         fw_iso_context_stop(isight->context);
 327         fw_iso_context_destroy(isight->context);
 328         isight->context = NULL;
 329         fw_iso_resources_free(&isight->resources);
 330         value = 0;
 331         snd_fw_transaction(isight->unit, TCODE_WRITE_QUADLET_REQUEST,
 332                            isight->audio_base + REG_AUDIO_ENABLE,
 333                            &value, 4, FW_QUIET);
 334 }
 335
 336 static int isight_hw_free(struct snd_pcm_substream *substream)
 337 {
 338         struct isight *isight = substream->private_data;
 339
 340         ACCESS_ONCE(isight->pcm_active) = false;
 341
 342         mutex_lock(&isight->mutex);
 343         isight_stop_streaming(isight);
 344         mutex_unlock(&isight->mutex);
 345
 346         return snd_pcm_lib_free_vmalloc_buffer(substream);
 347 }
 348
 349 static int isight_start_streaming(struct isight *isight)
 350 {
 351         unsigned int i;
 352         int err;
 353
 354         if (isight->context) {
 355                 if (isight->packet_index < 0)
 356                         isight_stop_streaming(isight);
 357                 else
 358                         return 0;
 359         }
 360
 361         err = reg_write(isight, REG_SAMPLE_RATE, cpu_to_be32(RATE_48000));
 362         if (err < 0)
 363                 goto error;
 364
 365         err = isight_connect(isight);
 366         if (err < 0)
 367                 goto error;
 368
 369         err = reg_write(isight, REG_AUDIO_ENABLE, cpu_to_be32(AUDIO_ENABLE));
 370         if (err < 0)
 371                 goto err_resources;
 372
 373         isight->context = fw_iso_context_create(isight->device->card,
 374                                                 FW_ISO_CONTEXT_RECEIVE,
 375                                                 isight->resources.channel,
 376                                                 isight->device->max_speed,
 377                                                 4, isight_packet, isight);
 378         if (IS_ERR(isight->context)) {
 379                 err = PTR_ERR(isight->context);
 380                 isight->context = NULL;
 381                 goto err_resources;
 382         }
 383
 384         for (i = 0; i < QUEUE_LENGTH; ++i) {
 385                 err = fw_iso_context_queue(isight->context, &audio_packet,
 386                                            &isight->buffer.iso_buffer,
 387                                            isight->buffer.packets[i].offset);
 388                 if (err < 0)
 389                         goto err_context;
 390         }
 391
 392         isight->first_packet = true;
 393         isight->packet_index = 0;
 394
 395         err = fw_iso_context_start(isight->context, -1, 0,
 396                                    FW_ISO_CONTEXT_MATCH_ALL_TAGS/*?*/);
 397         if (err < 0)
 398                 goto err_context;
 399
 400         return 0;
 401
 402 err_context:
 403         fw_iso_context_destroy(isight->context);
 404         isight->context = NULL;
 405 err_resources:
 406         fw_iso_resources_free(&isight->resources);
 407         reg_write(isight, REG_AUDIO_ENABLE, 0);
 408 error:
 409         return err;
 410 }
 411
 412 static int isight_prepare(struct snd_pcm_substream *substream)
 413 {
 414         struct isight *isight = substream->private_data;
 415         int err;
 416
 417         isight->buffer_pointer = 0;
 418         isight->period_counter = 0;
 419
 420         mutex_lock(&isight->mutex);
 421         err = isight_start_streaming(isight);
 422         mutex_unlock(&isight->mutex);
 423
 424         return err;
 425 }
 426
 427 static int isight_trigger(struct snd_pcm_substream *substream, int cmd)
 428 {
 429         struct isight *isight = substream->private_data;
 430
 431         switch (cmd) {
 432         case SNDRV_PCM_TRIGGER_START:
 433                 ACCESS_ONCE(isight->pcm_running) = true;
 434                 break;
 435         case SNDRV_PCM_TRIGGER_STOP:
 436                 ACCESS_ONCE(isight->pcm_running) = false;
 437                 break;
 438         default:
 439                 return -EINVAL;
 440         }
 441         return 0;
 442 }
 443
 444 static snd_pcm_uframes_t isight_pointer(struct snd_pcm_substream *substream)
 445 {
 446         struct isight *isight = substream->private_data;
 447
 448         return ACCESS_ONCE(isight->buffer_pointer);
 449 }
 450
 451 static int isight_create_pcm(struct isight *isight)
 452 {
 453         static struct snd_pcm_ops ops = {
 454                 .open      = isight_open,
 455                 .close     = isight_close,
 456                 .ioctl     = snd_pcm_lib_ioctl,
 457                 .hw_params = isight_hw_params,
 458                 .hw_free   = isight_hw_free,
 459                 .prepare   = isight_prepare,
 460                 .trigger   = isight_trigger,
 461                 .pointer   = isight_pointer,
 462                 .page      = snd_pcm_lib_get_vmalloc_page,
 463                 .mmap      = snd_pcm_lib_mmap_vmalloc,
 464         };
 465         struct snd_pcm *pcm;
 466         int err;
 467
 468         err = snd_pcm_new(isight->card, "iSight", 0, 0, 1, &pcm);
 469         if (err < 0)
 470                 return err;
 471         pcm->private_data = isight;
 472         strcpy(pcm->name, "iSight");
 473         isight->pcm = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
 474         isight->pcm->ops = &ops;
 475
 476         return 0;
 477 }
 478
 479 static int isight_gain_info(struct snd_kcontrol *ctl,
 480                             struct snd_ctl_elem_info *info)
 481 {
 482         struct isight *isight = ctl->private_data;
 483
 484         info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 485         info->count = 1;
 486         info->value.integer.min = isight->gain_min;
 487         info->value.integer.max = isight->gain_max;
 488
 489         return 0;
 490 }
 491
 492 static int isight_gain_get(struct snd_kcontrol *ctl,
 493                            struct snd_ctl_elem_value *value)
 494 {
 495         struct isight *isight = ctl->private_data;
 496         __be32 gain;
 497         int err;
 498
 499         err = reg_read(isight, REG_GAIN, &gain);
 500         if (err < 0)
 501                 return err;
 502
 503         value->value.integer.value[0] = (s32)be32_to_cpu(gain);
 504
 505         return 0;
 506 }
 507
 508 static int isight_gain_put(struct snd_kcontrol *ctl,
 509                            struct snd_ctl_elem_value *value)
 510 {
 511         struct isight *isight = ctl->private_data;
 512
 513         if (value->value.integer.value[0] < isight->gain_min ||
 514             value->value.integer.value[0] > isight->gain_max)
 515                 return -EINVAL;
 516
 517         return reg_write(isight, REG_GAIN,
 518                          cpu_to_be32(value->value.integer.value[0]));
 519 }
 520
 521 static int isight_mute_get(struct snd_kcontrol *ctl,
 522                            struct snd_ctl_elem_value *value)
 523 {
 524         struct isight *isight = ctl->private_data;
 525         __be32 mute;
 526         int err;
 527
 528         err = reg_read(isight, REG_MUTE, &mute);
 529         if (err < 0)
 530                 return err;
 531
 532         value->value.integer.value[0] = !mute;
 533
 534         return 0;
 535 }
 536
 537 static int isight_mute_put(struct snd_kcontrol *ctl,
 538                            struct snd_ctl_elem_value *value)
 539 {
 540         struct isight *isight = ctl->private_data;
 541
 542         return reg_write(isight, REG_MUTE,
 543                          (__force __be32)!value->value.integer.value[0]);
 544 }
 545
 546 static int isight_create_mixer(struct isight *isight)
 547 {
 548         static const struct snd_kcontrol_new gain_control = {
 549                 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 550                 .name = "Mic Capture Volume",
 551                 .access = SNDRV_CTL_ELEM_ACCESS_READWRITE |
 552                           SNDRV_CTL_ELEM_ACCESS_TLV_READ,
 553                 .info = isight_gain_info,
 554                 .get = isight_gain_get,
 555                 .put = isight_gain_put,
 556         };
 557         static const struct snd_kcontrol_new mute_control = {
 558                 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 559                 .name = "Mic Capture Switch",
 560                 .info = snd_ctl_boolean_mono_info,
 561                 .get = isight_mute_get,
 562                 .put = isight_mute_put,
 563         };
 564         __be32 value;
 565         struct snd_kcontrol *ctl;
 566         int err;
 567
 568         err = reg_read(isight, REG_GAIN_RAW_START, &value);
 569         if (err < 0)
 570                 return err;
 571         isight->gain_min = be32_to_cpu(value);
 572
 573         err = reg_read(isight, REG_GAIN_RAW_END, &value);
 574         if (err < 0)
 575                 return err;
 576         isight->gain_max = be32_to_cpu(value);
 577
 578         isight->gain_tlv[0] = SNDRV_CTL_TLVT_DB_MINMAX;
 579         isight->gain_tlv[1] = 2 * sizeof(unsigned int);
 580
 581         err = reg_read(isight, REG_GAIN_DB_START, &value);
 582         if (err < 0)
 583                 return err;
 584         isight->gain_tlv[2] = (s32)be32_to_cpu(value) * 100;
 585
 586         err = reg_read(isight, REG_GAIN_DB_END, &value);
 587         if (err < 0)
 588                 return err;
 589         isight->gain_tlv[3] = (s32)be32_to_cpu(value) * 100;
 590
 591         ctl = snd_ctl_new1(&gain_control, isight);
 592         if (ctl)
 593                 ctl->tlv.p = isight->gain_tlv;
 594         err = snd_ctl_add(isight->card, ctl);
 595         if (err < 0)
 596                 return err;
 597
 598         err = snd_ctl_add(isight->card, snd_ctl_new1(&mute_control, isight));
 599         if (err < 0)
 600                 return err;
 601
 602         return 0;
 603 }
 604
 605 static void isight_card_free(struct snd_card *card)
 606 {
 607         struct isight *isight = card->private_data;
 608
 609         fw_iso_resources_destroy(&isight->resources);
 610         fw_unit_put(isight->unit);
 611         mutex_destroy(&isight->mutex);
 612 }
 613
 614 static u64 get_unit_base(struct fw_unit *unit)
 615 {
 616         struct fw_csr_iterator i;
 617         int key, value;
 618
 619         fw_csr_iterator_init(&i, unit->directory);
 620         while (fw_csr_iterator_next(&i, &key, &value))
 621                 if (key == CSR_OFFSET)
 622                         return CSR_REGISTER_BASE + value * 4;
 623         return 0;
 624 }
 625
 626 static int isight_probe(struct fw_unit *unit,
 627                         const struct ieee1394_device_id *id)
 628 {
 629         struct fw_device *fw_dev = fw_parent_device(unit);
 630         struct snd_card *card;
 631         struct isight *isight;
 632         int err;
 633
 634         err = snd_card_new(&unit->device, -1, NULL, THIS_MODULE,
 635                            sizeof(*isight), &card);
 636         if (err < 0)
 637                 return err;
 638
 639         isight = card->private_data;
 640         isight->card = card;
 641         mutex_init(&isight->mutex);
 642         isight->unit = fw_unit_get(unit);
 643         isight->device = fw_dev;
 644         isight->audio_base = get_unit_base(unit);
 645         if (!isight->audio_base) {
 646                 dev_err(&unit->device, "audio unit base not found\n");
 647                 err = -ENXIO;
 648                 goto err_unit;
 649         }
 650         fw_iso_resources_init(&isight->resources, unit);
 651
 652         card->private_free = isight_card_free;
 653
 654         strcpy(card->driver, "iSight");
 655         strcpy(card->shortname, "Apple iSight");
 656         snprintf(card->longname, sizeof(card->longname),
 657                  "Apple iSight (GUID %08x%08x) at %s, S%d",
 658                  fw_dev->config_rom[3], fw_dev->config_rom[4],
 659                  dev_name(&unit->device), 100 << fw_dev->max_speed);
 660         strcpy(card->mixername, "iSight");
 661
 662         err = isight_create_pcm(isight);
 663         if (err < 0)
 664                 goto error;
 665
 666         err = isight_create_mixer(isight);
 667         if (err < 0)
 668                 goto error;
 669
 670         err = snd_card_register(card);
 671         if (err < 0)
 672                 goto error;
 673
 674         dev_set_drvdata(&unit->device, isight);
 675
 676         return 0;
 677
 678 err_unit:
 679         fw_unit_put(isight->unit);
 680         mutex_destroy(&isight->mutex);
 681 error:
 682         snd_card_free(card);
 683         return err;
 684 }
 685
 686 static void isight_bus_reset(struct fw_unit *unit)
 687 {
 688         struct isight *isight = dev_get_drvdata(&unit->device);
 689
 690         if (fw_iso_resources_update(&isight->resources) < 0) {
 691                 isight_pcm_abort(isight);
 692
 693                 mutex_lock(&isight->mutex);
 694                 isight_stop_streaming(isight);
 695                 mutex_unlock(&isight->mutex);
 696         }
 697 }
 698
 699 static void isight_remove(struct fw_unit *unit)
 700 {
 701         struct isight *isight = dev_get_drvdata(&unit->device);
 702
 703         isight_pcm_abort(isight);
 704
 705         snd_card_disconnect(isight->card);
 706
 707         mutex_lock(&isight->mutex);
 708         isight_stop_streaming(isight);
 709         mutex_unlock(&isight->mutex);
 710
 711         snd_card_free_when_closed(isight->card);
 712 }
 713
 714 static const struct ieee1394_device_id isight_id_table[] = {
 715         {
 716                 .match_flags  = IEEE1394_MATCH_SPECIFIER_ID |
 717                                 IEEE1394_MATCH_VERSION,
 718                 .specifier_id = OUI_APPLE,
 719                 .version      = SW_ISIGHT_AUDIO,
 720         },
 721         { }
 722 };
 723 MODULE_DEVICE_TABLE(ieee1394, isight_id_table);
 724
 725 static struct fw_driver isight_driver = {
 726         .driver   = {
 727                 .owner  = THIS_MODULE,
 728                 .name   = KBUILD_MODNAME,
 729                 .bus    = &fw_bus_type,
 730         },
 731         .probe    = isight_probe,
 732         .update   = isight_bus_reset,
 733         .remove   = isight_remove,
 734         .id_table = isight_id_table,
 735 };
 736
 737 static int __init alsa_isight_init(void)
 738 {
 739         return driver_register(&isight_driver.driver);
 740 }
 741
 742 static void __exit alsa_isight_exit(void)
 743 {
 744         driver_unregister(&isight_driver.driver);
 745 }
 746
 747 module_init(alsa_isight_init);
 748 module_exit(alsa_isight_exit);