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 fw_address_handler iris_handler;
  55         struct snd_pcm_substream *pcm;
  56         struct mutex mutex;
  57         struct iso_packets_buffer buffer;
  58         struct fw_iso_resources resources;
  59         struct fw_iso_context *context;
  60         bool pcm_active;
  61         bool pcm_running;
  62         bool first_packet;
  63         int packet_index;
  64         u32 total_samples;
  65         unsigned int buffer_pointer;
  66         unsigned int period_counter;
  67         s32 gain_min, gain_max;
  68         unsigned int gain_tlv[4];
  69 };
  70
  71 struct audio_payload {
  72         __be32 sample_count;
  73         __be32 signature;
  74         __be32 sample_total;
  75         __be32 reserved;
  76         __be16 samples[2 * MAX_FRAMES_PER_PACKET];
  77 };
  78
  79 MODULE_DESCRIPTION("iSight audio driver");
  80 MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>");
  81 MODULE_LICENSE("GPL v2");
  82
  83 static struct fw_iso_packet audio_packet = {
  84         .payload_length = sizeof(struct audio_payload),
  85         .interrupt = 1,
  86         .header_length = 4,
  87 };
  88
  89 static void isight_update_pointers(struct isight *isight, unsigned int count)
  90 {
  91         struct snd_pcm_runtime *runtime = isight->pcm->runtime;
  92         unsigned int ptr;
  93
  94         smp_wmb(); /* update buffer data before buffer pointer */
  95
  96         ptr = isight->buffer_pointer;
  97         ptr += count;
  98         if (ptr >= runtime->buffer_size)
  99                 ptr -= runtime->buffer_size;
 100         ACCESS_ONCE(isight->buffer_pointer) = ptr;
 101
 102         isight->period_counter += count;
 103         if (isight->period_counter >= runtime->period_size) {
 104                 isight->period_counter -= runtime->period_size;
 105                 snd_pcm_period_elapsed(isight->pcm);
 106         }
 107 }
 108
 109 static void isight_samples(struct isight *isight,
 110                            const __be16 *samples, unsigned int count)
 111 {
 112         struct snd_pcm_runtime *runtime;
 113         unsigned int count1;
 114
 115         if (!ACCESS_ONCE(isight->pcm_running))
 116                 return;
 117
 118         runtime = isight->pcm->runtime;
 119         if (isight->buffer_pointer + count <= runtime->buffer_size) {
 120                 memcpy(runtime->dma_area + isight->buffer_pointer * 4,
 121                        samples, count * 4);
 122         } else {
 123                 count1 = runtime->buffer_size - isight->buffer_pointer;
 124                 memcpy(runtime->dma_area + isight->buffer_pointer * 4,
 125                        samples, count1 * 4);
 126                 samples += count1 * 2;
 127                 memcpy(runtime->dma_area, samples, (count - count1) * 4);
 128         }
 129
 130         isight_update_pointers(isight, count);
 131 }
 132
 133 static void isight_pcm_abort(struct isight *isight)
 134 {
 135         unsigned long flags;
 136
 137         if (ACCESS_ONCE(isight->pcm_active)) {
 138                 snd_pcm_stream_lock_irqsave(isight->pcm, flags);
 139                 if (snd_pcm_running(isight->pcm))
 140                         snd_pcm_stop(isight->pcm, SNDRV_PCM_STATE_XRUN);
 141                 snd_pcm_stream_unlock_irqrestore(isight->pcm, flags);
 142         }
 143 }
 144
 145 static void isight_dropped_samples(struct isight *isight, unsigned int total)
 146 {
 147         struct snd_pcm_runtime *runtime;
 148         u32 dropped;
 149         unsigned int count1;
 150
 151         if (!ACCESS_ONCE(isight->pcm_running))
 152                 return;
 153
 154         runtime = isight->pcm->runtime;
 155         dropped = total - isight->total_samples;
 156         if (dropped < runtime->buffer_size) {
 157                 if (isight->buffer_pointer + dropped <= runtime->buffer_size) {
 158                         memset(runtime->dma_area + isight->buffer_pointer * 4,
 159                                0, dropped * 4);
 160                 } else {
 161                         count1 = runtime->buffer_size - isight->buffer_pointer;
 162                         memset(runtime->dma_area + isight->buffer_pointer * 4,
 163                                0, count1 * 4);
 164                         memset(runtime->dma_area, 0, (dropped - count1) * 4);
 165                 }
 166                 isight_update_pointers(isight, dropped);
 167         } else {
 168                 isight_pcm_abort(isight);
 169         }
 170 }
 171
 172 static void isight_packet(struct fw_iso_context *context, u32 cycle,
 173                           size_t header_length, void *header, void *data)
 174 {
 175         struct isight *isight = data;
 176         const struct audio_payload *payload;
 177         unsigned int index, length, count, total;
 178         int err;
 179
 180         if (isight->packet_index < 0)
 181                 return;
 182         index = isight->packet_index;
 183         payload = isight->buffer.packets[index].buffer;
 184         length = be32_to_cpup(header) >> 16;
 185
 186         if (likely(length >= 16 &&
 187                    payload->signature == cpu_to_be32(0x73676874/*"sght"*/))) {
 188                 count = be32_to_cpu(payload->sample_count);
 189                 if (likely(count <= (length - 16) / 4)) {
 190                         total = be32_to_cpu(payload->sample_total);
 191                         if (unlikely(total != isight->total_samples)) {
 192                                 if (!isight->first_packet)
 193                                         isight_dropped_samples(isight, total);
 194                                 isight->first_packet = false;
 195                                 isight->total_samples = total;
 196                         }
 197
 198                         isight_samples(isight, payload->samples, count);
 199                         isight->total_samples += count;
 200                 }
 201         }
 202
 203         err = fw_iso_context_queue(isight->context, &audio_packet,
 204                                    &isight->buffer.iso_buffer,
 205                                    isight->buffer.packets[index].offset);
 206         if (err < 0) {
 207                 dev_err(&isight->unit->device, "queueing error: %d\n", err);
 208                 isight_pcm_abort(isight);
 209                 isight->packet_index = -1;
 210                 return;
 211         }
 212         fw_iso_context_queue_flush(isight->context);
 213
 214         if (++index >= QUEUE_LENGTH)
 215                 index = 0;
 216         isight->packet_index = index;
 217 }
 218
 219 static int isight_connect(struct isight *isight)
 220 {
 221         int ch, err, rcode, errors = 0;
 222         __be32 value;
 223
 224 retry_after_bus_reset:
 225         ch = fw_iso_resources_allocate(&isight->resources,
 226                                        sizeof(struct audio_payload),
 227                                        isight->device->max_speed);
 228         if (ch < 0) {
 229                 err = ch;
 230                 goto error;
 231         }
 232
 233         value = cpu_to_be32(ch | (isight->device->max_speed << SPEED_SHIFT));
 234         for (;;) {
 235                 rcode = fw_run_transaction(
 236                                 isight->device->card,
 237                                 TCODE_WRITE_QUADLET_REQUEST,
 238                                 isight->device->node_id,
 239                                 isight->resources.generation,
 240                                 isight->device->max_speed,
 241                                 isight->audio_base + REG_ISO_TX_CONFIG,
 242                                 &value, 4);
 243                 if (rcode == RCODE_COMPLETE) {
 244                         return 0;
 245                 } else if (rcode == RCODE_GENERATION) {
 246                         fw_iso_resources_free(&isight->resources);
 247                         goto retry_after_bus_reset;
 248                 } else if (rcode_is_permanent_error(rcode) || ++errors >= 3) {
 249                         err = -EIO;
 250                         goto err_resources;
 251                 }
 252                 msleep(5);
 253         }
 254
 255 err_resources:
 256         fw_iso_resources_free(&isight->resources);
 257 error:
 258         return err;
 259 }
 260
 261 static int isight_open(struct snd_pcm_substream *substream)
 262 {
 263         static const struct snd_pcm_hardware hardware = {
 264                 .info = SNDRV_PCM_INFO_MMAP |
 265                         SNDRV_PCM_INFO_MMAP_VALID |
 266                         SNDRV_PCM_INFO_BATCH |
 267                         SNDRV_PCM_INFO_INTERLEAVED |
 268                         SNDRV_PCM_INFO_BLOCK_TRANSFER,
 269                 .formats = SNDRV_PCM_FMTBIT_S16_BE,
 270                 .rates = SNDRV_PCM_RATE_48000,
 271                 .rate_min = 48000,
 272                 .rate_max = 48000,
 273                 .channels_min = 2,
 274                 .channels_max = 2,
 275                 .buffer_bytes_max = 4 * 1024 * 1024,
 276                 .period_bytes_min = MAX_FRAMES_PER_PACKET * 4,
 277                 .period_bytes_max = 1024 * 1024,
 278                 .periods_min = 2,
 279                 .periods_max = UINT_MAX,
 280         };
 281         struct isight *isight = substream->private_data;
 282
 283         substream->runtime->hw = hardware;
 284
 285         return iso_packets_buffer_init(&isight->buffer, isight->unit,
 286                                        QUEUE_LENGTH,
 287                                        sizeof(struct audio_payload),
 288                                        DMA_FROM_DEVICE);
 289 }
 290
 291 static int isight_close(struct snd_pcm_substream *substream)
 292 {
 293         struct isight *isight = substream->private_data;
 294
 295         iso_packets_buffer_destroy(&isight->buffer, isight->unit);
 296
 297         return 0;
 298 }
 299
 300 static int isight_hw_params(struct snd_pcm_substream *substream,
 301                             struct snd_pcm_hw_params *hw_params)
 302 {
 303         struct isight *isight = substream->private_data;
 304         int err;
 305
 306         err = snd_pcm_lib_alloc_vmalloc_buffer(substream,
 307                                                params_buffer_bytes(hw_params));
 308         if (err < 0)
 309                 return err;
 310
 311         ACCESS_ONCE(isight->pcm_active) = true;
 312
 313         return 0;
 314 }
 315
 316 static int reg_read(struct isight *isight, int offset, __be32 *value)
 317 {
 318         return snd_fw_transaction(isight->unit, TCODE_READ_QUADLET_REQUEST,
 319                                   isight->audio_base + offset, value, 4);
 320 }
 321
 322 static int reg_write(struct isight *isight, int offset, __be32 value)
 323 {
 324         return snd_fw_transaction(isight->unit, TCODE_WRITE_QUADLET_REQUEST,
 325                                   isight->audio_base + offset, &value, 4);
 326 }
 327
 328 static void isight_stop_streaming(struct isight *isight)
 329 {
 330         if (!isight->context)
 331                 return;
 332
 333         fw_iso_context_stop(isight->context);
 334         fw_iso_context_destroy(isight->context);
 335         isight->context = NULL;
 336         fw_iso_resources_free(&isight->resources);
 337         reg_write(isight, REG_AUDIO_ENABLE, 0);
 338 }
 339
 340 static int isight_hw_free(struct snd_pcm_substream *substream)
 341 {
 342         struct isight *isight = substream->private_data;
 343
 344         ACCESS_ONCE(isight->pcm_active) = false;
 345
 346         mutex_lock(&isight->mutex);
 347         isight_stop_streaming(isight);
 348         mutex_unlock(&isight->mutex);
 349
 350         return snd_pcm_lib_free_vmalloc_buffer(substream);
 351 }
 352
 353 static int isight_start_streaming(struct isight *isight)
 354 {
 355         unsigned int i;
 356         int err;
 357
 358         if (isight->context) {
 359                 if (isight->packet_index < 0)
 360                         isight_stop_streaming(isight);
 361                 else
 362                         return 0;
 363         }
 364
 365         err = reg_write(isight, REG_SAMPLE_RATE, cpu_to_be32(RATE_48000));
 366         if (err < 0)
 367                 goto error;
 368
 369         err = isight_connect(isight);
 370         if (err < 0)
 371                 goto error;
 372
 373         err = reg_write(isight, REG_AUDIO_ENABLE, cpu_to_be32(AUDIO_ENABLE));
 374         if (err < 0)
 375                 goto err_resources;
 376
 377         isight->context = fw_iso_context_create(isight->device->card,
 378                                                 FW_ISO_CONTEXT_RECEIVE,
 379                                                 isight->resources.channel,
 380                                                 isight->device->max_speed,
 381                                                 4, isight_packet, isight);
 382         if (IS_ERR(isight->context)) {
 383                 err = PTR_ERR(isight->context);
 384                 isight->context = NULL;
 385                 goto err_resources;
 386         }
 387
 388         for (i = 0; i < QUEUE_LENGTH; ++i) {
 389                 err = fw_iso_context_queue(isight->context, &audio_packet,
 390                                            &isight->buffer.iso_buffer,
 391                                            isight->buffer.packets[i].offset);
 392                 if (err < 0)
 393                         goto err_context;
 394         }
 395
 396         isight->first_packet = true;
 397         isight->packet_index = 0;
 398
 399         err = fw_iso_context_start(isight->context, -1, 0,
 400                                    FW_ISO_CONTEXT_MATCH_ALL_TAGS/*?*/);
 401         if (err < 0)
 402                 goto err_context;
 403
 404         return 0;
 405
 406 err_context:
 407         fw_iso_context_destroy(isight->context);
 408         isight->context = NULL;
 409 err_resources:
 410         fw_iso_resources_free(&isight->resources);
 411         reg_write(isight, REG_AUDIO_ENABLE, 0);
 412 error:
 413         return err;
 414 }
 415
 416 static int isight_prepare(struct snd_pcm_substream *substream)
 417 {
 418         struct isight *isight = substream->private_data;
 419         int err;
 420
 421         isight->buffer_pointer = 0;
 422         isight->period_counter = 0;
 423
 424         mutex_lock(&isight->mutex);
 425         err = isight_start_streaming(isight);
 426         mutex_unlock(&isight->mutex);
 427
 428         return err;
 429 }
 430
 431 static int isight_trigger(struct snd_pcm_substream *substream, int cmd)
 432 {
 433         struct isight *isight = substream->private_data;
 434
 435         switch (cmd) {
 436         case SNDRV_PCM_TRIGGER_START:
 437                 ACCESS_ONCE(isight->pcm_running) = true;
 438                 break;
 439         case SNDRV_PCM_TRIGGER_STOP:
 440                 ACCESS_ONCE(isight->pcm_running) = false;
 441                 break;
 442         default:
 443                 return -EINVAL;
 444         }
 445         return 0;
 446 }
 447
 448 static snd_pcm_uframes_t isight_pointer(struct snd_pcm_substream *substream)
 449 {
 450         struct isight *isight = substream->private_data;
 451
 452         return ACCESS_ONCE(isight->buffer_pointer);
 453 }
 454
 455 static int isight_create_pcm(struct isight *isight)
 456 {
 457         static struct snd_pcm_ops ops = {
 458                 .open      = isight_open,
 459                 .close     = isight_close,
 460                 .ioctl     = snd_pcm_lib_ioctl,
 461                 .hw_params = isight_hw_params,
 462                 .hw_free   = isight_hw_free,
 463                 .prepare   = isight_prepare,
 464                 .trigger   = isight_trigger,
 465                 .pointer   = isight_pointer,
 466                 .page      = snd_pcm_lib_get_vmalloc_page,
 467                 .mmap      = snd_pcm_lib_mmap_vmalloc,
 468         };
 469         struct snd_pcm *pcm;
 470         int err;
 471
 472         err = snd_pcm_new(isight->card, "iSight", 0, 0, 1, &pcm);
 473         if (err < 0)
 474                 return err;
 475         pcm->private_data = isight;
 476         strcpy(pcm->name, "iSight");
 477         isight->pcm = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
 478         isight->pcm->ops = &ops;
 479
 480         return 0;
 481 }
 482
 483 static int isight_gain_info(struct snd_kcontrol *ctl,
 484                             struct snd_ctl_elem_info *info)
 485 {
 486         struct isight *isight = ctl->private_data;
 487
 488         info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 489         info->count = 1;
 490         info->value.integer.min = isight->gain_min;
 491         info->value.integer.max = isight->gain_max;
 492
 493         return 0;
 494 }
 495
 496 static int isight_gain_get(struct snd_kcontrol *ctl,
 497                            struct snd_ctl_elem_value *value)
 498 {
 499         struct isight *isight = ctl->private_data;
 500         __be32 gain;
 501         int err;
 502
 503         err = reg_read(isight, REG_GAIN, &gain);
 504         if (err < 0)
 505                 return err;
 506
 507         value->value.integer.value[0] = (s32)be32_to_cpu(gain);
 508
 509         return 0;
 510 }
 511
 512 static int isight_gain_put(struct snd_kcontrol *ctl,
 513                            struct snd_ctl_elem_value *value)
 514 {
 515         struct isight *isight = ctl->private_data;
 516
 517         if (value->value.integer.value[0] < isight->gain_min ||
 518             value->value.integer.value[0] > isight->gain_max)
 519                 return -EINVAL;
 520
 521         return reg_write(isight, REG_GAIN,
 522                          cpu_to_be32(value->value.integer.value[0]));
 523 }
 524
 525 static int isight_mute_get(struct snd_kcontrol *ctl,
 526                            struct snd_ctl_elem_value *value)
 527 {
 528         struct isight *isight = ctl->private_data;
 529         __be32 mute;
 530         int err;
 531
 532         err = reg_read(isight, REG_MUTE, &mute);
 533         if (err < 0)
 534                 return err;
 535
 536         value->value.integer.value[0] = !mute;
 537
 538         return 0;
 539 }
 540
 541 static int isight_mute_put(struct snd_kcontrol *ctl,
 542                            struct snd_ctl_elem_value *value)
 543 {
 544         struct isight *isight = ctl->private_data;
 545
 546         return reg_write(isight, REG_MUTE,
 547                          (__force __be32)!value->value.integer.value[0]);
 548 }
 549
 550 static int isight_create_mixer(struct isight *isight)
 551 {
 552         static const struct snd_kcontrol_new gain_control = {
 553                 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 554                 .name = "Mic Capture Volume",
 555                 .access = SNDRV_CTL_ELEM_ACCESS_READWRITE |
 556                           SNDRV_CTL_ELEM_ACCESS_TLV_READ,
 557                 .info = isight_gain_info,
 558                 .get = isight_gain_get,
 559                 .put = isight_gain_put,
 560         };
 561         static const struct snd_kcontrol_new mute_control = {
 562                 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 563                 .name = "Mic Capture Switch",
 564                 .info = snd_ctl_boolean_mono_info,
 565                 .get = isight_mute_get,
 566                 .put = isight_mute_put,
 567         };
 568         __be32 value;
 569         struct snd_kcontrol *ctl;
 570         int err;
 571
 572         err = reg_read(isight, REG_GAIN_RAW_START, &value);
 573         if (err < 0)
 574                 return err;
 575         isight->gain_min = be32_to_cpu(value);
 576
 577         err = reg_read(isight, REG_GAIN_RAW_END, &value);
 578         if (err < 0)
 579                 return err;
 580         isight->gain_max = be32_to_cpu(value);
 581
 582         isight->gain_tlv[0] = SNDRV_CTL_TLVT_DB_MINMAX;
 583         isight->gain_tlv[1] = 2 * sizeof(unsigned int);
 584
 585         err = reg_read(isight, REG_GAIN_DB_START, &value);
 586         if (err < 0)
 587                 return err;
 588         isight->gain_tlv[2] = (s32)be32_to_cpu(value) * 100;
 589
 590         err = reg_read(isight, REG_GAIN_DB_END, &value);
 591         if (err < 0)
 592                 return err;
 593         isight->gain_tlv[3] = (s32)be32_to_cpu(value) * 100;
 594
 595         ctl = snd_ctl_new1(&gain_control, isight);
 596         if (ctl)
 597                 ctl->tlv.p = isight->gain_tlv;
 598         err = snd_ctl_add(isight->card, ctl);
 599         if (err < 0)
 600                 return err;
 601
 602         err = snd_ctl_add(isight->card, snd_ctl_new1(&mute_control, isight));
 603         if (err < 0)
 604                 return err;
 605
 606         return 0;
 607 }
 608
 609 static void isight_card_free(struct snd_card *card)
 610 {
 611         struct isight *isight = card->private_data;
 612
 613         fw_iso_resources_destroy(&isight->resources);
 614         fw_unit_put(isight->unit);
 615         fw_device_put(isight->device);
 616         mutex_destroy(&isight->mutex);
 617 }
 618
 619 static u64 get_unit_base(struct fw_unit *unit)
 620 {
 621         struct fw_csr_iterator i;
 622         int key, value;
 623
 624         fw_csr_iterator_init(&i, unit->directory);
 625         while (fw_csr_iterator_next(&i, &key, &value))
 626                 if (key == CSR_OFFSET)
 627                         return CSR_REGISTER_BASE + value * 4;
 628         return 0;
 629 }
 630
 631 static int isight_probe(struct device *unit_dev)
 632 {
 633         struct fw_unit *unit = fw_unit(unit_dev);
 634         struct fw_device *fw_dev = fw_parent_device(unit);
 635         struct snd_card *card;
 636         struct isight *isight;
 637         int err;
 638
 639         err = snd_card_create(-1, NULL, THIS_MODULE, sizeof(*isight), &card);
 640         if (err < 0)
 641                 return err;
 642         snd_card_set_dev(card, unit_dev);
 643
 644         isight = card->private_data;
 645         isight->card = card;
 646         mutex_init(&isight->mutex);
 647         isight->unit = fw_unit_get(unit);
 648         isight->device = fw_device_get(fw_dev);
 649         isight->audio_base = get_unit_base(unit);
 650         if (!isight->audio_base) {
 651                 dev_err(&unit->device, "audio unit base not found\n");
 652                 err = -ENXIO;
 653                 goto err_unit;
 654         }
 655         fw_iso_resources_init(&isight->resources, unit);
 656
 657         card->private_free = isight_card_free;
 658
 659         strcpy(card->driver, "iSight");
 660         strcpy(card->shortname, "Apple iSight");
 661         snprintf(card->longname, sizeof(card->longname),
 662                  "Apple iSight (GUID %08x%08x) at %s, S%d",
 663                  fw_dev->config_rom[3], fw_dev->config_rom[4],
 664                  dev_name(&unit->device), 100 << fw_dev->max_speed);
 665         strcpy(card->mixername, "iSight");
 666
 667         err = isight_create_pcm(isight);
 668         if (err < 0)
 669                 goto error;
 670
 671         err = isight_create_mixer(isight);
 672         if (err < 0)
 673                 goto error;
 674
 675         err = snd_card_register(card);
 676         if (err < 0)
 677                 goto error;
 678
 679         dev_set_drvdata(unit_dev, isight);
 680
 681         return 0;
 682
 683 err_unit:
 684         fw_unit_put(isight->unit);
 685         fw_device_put(isight->device);
 686         mutex_destroy(&isight->mutex);
 687 error:
 688         snd_card_free(card);
 689         return err;
 690 }
 691
 692 static int isight_remove(struct device *dev)
 693 {
 694         struct isight *isight = dev_get_drvdata(dev);
 695
 696         isight_pcm_abort(isight);
 697
 698         snd_card_disconnect(isight->card);
 699
 700         mutex_lock(&isight->mutex);
 701         isight_stop_streaming(isight);
 702         mutex_unlock(&isight->mutex);
 703
 704         snd_card_free_when_closed(isight->card);
 705
 706         return 0;
 707 }
 708
 709 static void isight_bus_reset(struct fw_unit *unit)
 710 {
 711         struct isight *isight = dev_get_drvdata(&unit->device);
 712
 713         if (fw_iso_resources_update(&isight->resources) < 0) {
 714                 isight_pcm_abort(isight);
 715
 716                 mutex_lock(&isight->mutex);
 717                 isight_stop_streaming(isight);
 718                 mutex_unlock(&isight->mutex);
 719         }
 720 }
 721
 722 static const struct ieee1394_device_id isight_id_table[] = {
 723         {
 724                 .match_flags  = IEEE1394_MATCH_SPECIFIER_ID |
 725                                 IEEE1394_MATCH_VERSION,
 726                 .specifier_id = OUI_APPLE,
 727                 .version      = SW_ISIGHT_AUDIO,
 728         },
 729         { }
 730 };
 731 MODULE_DEVICE_TABLE(ieee1394, isight_id_table);
 732
 733 static struct fw_driver isight_driver = {
 734         .driver   = {
 735                 .owner  = THIS_MODULE,
 736                 .name   = KBUILD_MODNAME,
 737                 .bus    = &fw_bus_type,
 738                 .probe  = isight_probe,
 739                 .remove = isight_remove,
 740         },
 741         .update   = isight_bus_reset,
 742         .id_table = isight_id_table,
 743 };
 744
 745 static int __init alsa_isight_init(void)
 746 {
 747         return driver_register(&isight_driver.driver);
 748 }
 749
 750 static void __exit alsa_isight_exit(void)
 751 {
 752         driver_unregister(&isight_driver.driver);
 753 }
 754
 755 module_init(alsa_isight_init);
 756 module_exit(alsa_isight_exit);