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 <linux/device.h>
   9 #include <linux/firewire.h>
  10 #include <linux/firewire-constants.h>
  11 #include <linux/module.h>
  12 #include <linux/mod_devicetable.h>
  13 #include <linux/mutex.h>
  14 #include <linux/string.h>
  15 #include <sound/control.h>
  16 #include <sound/core.h>
  17 #include <sound/initval.h>
  18 #include <sound/pcm.h>
  19 #include <sound/tlv.h>
  20 #include "lib.h"
  21 #include "iso-resources.h"
  22 #include "packets-buffer.h"
  23
  24 #define OUI_APPLE               0x000a27
  25 #define MODEL_APPLE_ISIGHT      0x000008
  26 #define SW_ISIGHT_AUDIO         0x000010
  27
  28 #define REG_AUDIO_ENABLE        0x000
  29 #define  AUDIO_ENABLE           0x80000000
  30 #define REG_DEF_AUDIO_GAIN      0x204
  31 #define REG_GAIN_RAW_START      0x210
  32 #define REG_GAIN_RAW_END        0x214
  33 #define REG_GAIN_DB_START       0x218
  34 #define REG_GAIN_DB_END         0x21c
  35 #define REG_SAMPLE_RATE_INQUIRY 0x280
  36 #define REG_ISO_TX_CONFIG       0x300
  37 #define  SPEED_SHIFT            16
  38 #define REG_SAMPLE_RATE         0x400
  39 #define  RATE_48000             0x80000000
  40 #define REG_GAIN                0x500
  41 #define REG_MUTE                0x504
  42
  43 #define MAX_FRAMES_PER_PACKET   475
  44
  45 #define QUEUE_LENGTH            20
  46
  47 struct isight {
  48         struct snd_card *card;
  49         struct fw_unit *unit;
  50         struct fw_device *device;
  51         u64 audio_base;
  52         struct fw_address_handler iris_handler;
  53         struct snd_pcm_substream *pcm;
  54         struct mutex mutex;
  55         struct iso_packets_buffer buffer;
  56         struct fw_iso_resources resources;
  57         struct fw_iso_context *context;
  58         bool pcm_active;
  59         bool pcm_running;
  60         bool first_packet;
  61         int packet_index;
  62         u32 total_samples;
  63         unsigned int buffer_pointer;
  64         unsigned int period_counter;
  65         s32 gain_min, gain_max;
  66         unsigned int gain_tlv[4];
  67 };
  68
  69 struct audio_payload {
  70         __be32 sample_count;
  71         __be32 signature;
  72         __be32 sample_total;
  73         __be32 reserved;
  74         __be16 samples[2 * MAX_FRAMES_PER_PACKET];
  75 };
  76
  77 MODULE_DESCRIPTION("iSight audio driver");
  78 MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>");
  79 MODULE_LICENSE("GPL v2");
  80
  81 static struct fw_iso_packet audio_packet = {
  82         .payload_length = sizeof(struct audio_payload),
  83         .interrupt = 1,
  84 };
  85
  86 static void isight_update_pointers(struct isight *isight, unsigned int count)
  87 {
  88         struct snd_pcm_runtime *runtime = isight->pcm->runtime;
  89         unsigned int ptr;
  90
  91         smp_wmb(); /* update buffer data before buffer pointer */
  92
  93         ptr = isight->buffer_pointer;
  94         ptr += count;
  95         if (ptr >= runtime->buffer_size)
  96                 ptr -= runtime->buffer_size;
  97         ACCESS_ONCE(isight->buffer_pointer) = ptr;
  98
  99         isight->period_counter += count;
 100         if (isight->period_counter >= runtime->period_size) {
 101                 isight->period_counter -= runtime->period_size;
 102                 snd_pcm_period_elapsed(isight->pcm);
 103         }
 104 }
 105
 106 static void isight_samples(struct isight *isight,
 107                            const __be16 *samples, unsigned int count)
 108 {
 109         struct snd_pcm_runtime *runtime;
 110         unsigned int count1;
 111
 112         if (!ACCESS_ONCE(isight->pcm_running))
 113                 return;
 114
 115         runtime = isight->pcm->runtime;
 116         if (isight->buffer_pointer + count <= runtime->buffer_size) {
 117                 memcpy(runtime->dma_area + isight->buffer_pointer * 4,
 118                        samples, count * 4);
 119         } else {
 120                 count1 = runtime->buffer_size - isight->buffer_pointer;
 121                 memcpy(runtime->dma_area + isight->buffer_pointer * 4,
 122                        samples, count1 * 4);
 123                 samples += count1 * 2;
 124                 memcpy(runtime->dma_area, samples, (count - count1) * 4);
 125         }
 126
 127         isight_update_pointers(isight, count);
 128 }
 129
 130 static void isight_pcm_abort(struct isight *isight)
 131 {
 132         unsigned long flags;
 133
 134         if (ACCESS_ONCE(isight->pcm_active)) {
 135                 snd_pcm_stream_lock_irqsave(isight->pcm, flags);
 136                 if (snd_pcm_running(isight->pcm))
 137                         snd_pcm_stop(isight->pcm, SNDRV_PCM_STATE_XRUN);
 138                 snd_pcm_stream_unlock_irqrestore(isight->pcm, flags);
 139         }
 140 }
 141
 142 static void isight_dropped_samples(struct isight *isight, unsigned int total)
 143 {
 144         struct snd_pcm_runtime *runtime;
 145         u32 dropped;
 146         unsigned int count1;
 147
 148         if (!ACCESS_ONCE(isight->pcm_running))
 149                 return;
 150
 151         runtime = isight->pcm->runtime;
 152         dropped = total - isight->total_samples;
 153         if (dropped < runtime->buffer_size) {
 154                 if (isight->buffer_pointer + dropped <= runtime->buffer_size) {
 155                         memset(runtime->dma_area + isight->buffer_pointer * 4,
 156                                0, dropped * 4);
 157                 } else {
 158                         count1 = runtime->buffer_size - isight->buffer_pointer;
 159                         memset(runtime->dma_area + isight->buffer_pointer * 4,
 160                                0, count1 * 4);
 161                         memset(runtime->dma_area, 0, (dropped - count1) * 4);
 162                 }
 163                 isight_update_pointers(isight, dropped);
 164         } else {
 165                 isight_pcm_abort(isight);
 166         }
 167 }
 168
 169 static void isight_packet(struct fw_iso_context *context, u32 cycle,
 170                           size_t header_length, void *header, void *data)
 171 {
 172         struct isight *isight = data;
 173         const struct audio_payload *payload;
 174         unsigned int index, length, count, total;
 175         int err;
 176
 177         if (isight->packet_index < 0)
 178                 return;
 179         index = isight->packet_index;
 180         payload = isight->buffer.packets[index].buffer;
 181         length = be32_to_cpup(header) >> 16;
 182
 183         if (likely(length >= 16 &&
 184                    payload->signature == cpu_to_be32(0x73676874/*"sght"*/))) {
 185                 count = be32_to_cpu(payload->sample_count);
 186                 if (likely(count <= (length - 16) / 4)) {
 187                         total = be32_to_cpu(payload->sample_total);
 188                         if (unlikely(total != isight->total_samples)) {
 189                                 if (!isight->first_packet)
 190                                         isight_dropped_samples(isight, total);
 191                                 isight->first_packet = false;
 192                                 isight->total_samples = total;
 193                         }
 194
 195                         isight_samples(isight, payload->samples, count);
 196                         isight->total_samples += count;
 197                 }
 198         }
 199
 200         if (++index >= QUEUE_LENGTH)
 201                 index = 0;
 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
 213         isight->packet_index = index;
 214 }
 215
 216 static int isight_connect(struct isight *isight)
 217 {
 218         int ch, err, rcode, errors = 0;
 219         __be32 value;
 220
 221 retry_after_bus_reset:
 222         ch = fw_iso_resources_allocate(&isight->resources,
 223                                        sizeof(struct audio_payload),
 224                                        isight->device->max_speed);
 225         if (ch < 0) {
 226                 err = ch;
 227                 goto error;
 228         }
 229
 230         value = cpu_to_be32(ch | (isight->device->max_speed << SPEED_SHIFT));
 231         for (;;) {
 232                 rcode = fw_run_transaction(
 233                                 isight->device->card,
 234                                 TCODE_WRITE_QUADLET_REQUEST,
 235                                 isight->device->node_id,
 236                                 isight->resources.generation,
 237                                 isight->device->max_speed,
 238                                 isight->audio_base + REG_ISO_TX_CONFIG,
 239                                 &value, 4);
 240                 if (rcode == RCODE_COMPLETE) {
 241                         return 0;
 242                 } else if (rcode == RCODE_GENERATION) {
 243                         fw_iso_resources_free(&isight->resources);
 244                         goto retry_after_bus_reset;
 245                 } else if (rcode_is_permanent_error(rcode) || ++errors >= 3) {
 246                         err = -EIO;
 247                         goto err_resources;
 248                 }
 249                 msleep(5);
 250         }
 251
 252 err_resources:
 253         fw_iso_resources_free(&isight->resources);
 254 error:
 255         return err;
 256 }
 257
 258 static int isight_open(struct snd_pcm_substream *substream)
 259 {
 260         static const struct snd_pcm_hardware hardware = {
 261                 .info = SNDRV_PCM_INFO_MMAP |
 262                         SNDRV_PCM_INFO_MMAP_VALID |
 263                         SNDRV_PCM_INFO_BATCH |
 264                         SNDRV_PCM_INFO_INTERLEAVED |
 265                         SNDRV_PCM_INFO_BLOCK_TRANSFER,
 266                 .formats = SNDRV_PCM_FMTBIT_S16_BE,
 267                 .rates = SNDRV_PCM_RATE_48000,
 268                 .rate_min = 48000,
 269                 .rate_max = 48000,
 270                 .channels_min = 2,
 271                 .channels_max = 2,
 272                 .buffer_bytes_max = 4 * 1024 * 1024,
 273                 .period_bytes_min = MAX_FRAMES_PER_PACKET * 4,
 274                 .period_bytes_max = 1024 * 1024,
 275                 .periods_min = 2,
 276                 .periods_max = UINT_MAX,
 277         };
 278         struct isight *isight = substream->private_data;
 279
 280         substream->runtime->hw = hardware;
 281
 282         return iso_packets_buffer_init(&isight->buffer, isight->unit,
 283                                        QUEUE_LENGTH,
 284                                        sizeof(struct audio_payload),
 285                                        DMA_FROM_DEVICE);
 286 }
 287
 288 static int isight_close(struct snd_pcm_substream *substream)
 289 {
 290         struct isight *isight = substream->private_data;
 291
 292         iso_packets_buffer_destroy(&isight->buffer, isight->unit);
 293
 294         return 0;
 295 }
 296
 297 static int isight_hw_params(struct snd_pcm_substream *substream,
 298                             struct snd_pcm_hw_params *hw_params)
 299 {
 300         struct isight *isight = substream->private_data;
 301         int err;
 302
 303         err = snd_pcm_lib_alloc_vmalloc_buffer(substream,
 304                                                params_buffer_bytes(hw_params));
 305         if (err < 0)
 306                 return err;
 307
 308         ACCESS_ONCE(isight->pcm_active) = true;
 309
 310         return 0;
 311 }
 312
 313 static void isight_stop_streaming(struct isight *isight)
 314 {
 315         __be32 value;
 316
 317         if (!isight->context)
 318                 return;
 319
 320         fw_iso_context_stop(isight->context);
 321         fw_iso_context_destroy(isight->context);
 322         isight->context = NULL;
 323
 324         value = 0;
 325         snd_fw_transaction(isight->unit, TCODE_WRITE_QUADLET_REQUEST,
 326                            isight->audio_base + REG_AUDIO_ENABLE,
 327                            &value, 4);
 328
 329         fw_iso_resources_free(&isight->resources);
 330 }
 331
 332 static int isight_hw_free(struct snd_pcm_substream *substream)
 333 {
 334         struct isight *isight = substream->private_data;
 335
 336         ACCESS_ONCE(isight->pcm_active) = false;
 337
 338         mutex_lock(&isight->mutex);
 339         isight_stop_streaming(isight);
 340         mutex_unlock(&isight->mutex);
 341
 342         return snd_pcm_lib_free_vmalloc_buffer(substream);
 343 }
 344
 345 static int isight_start_streaming(struct isight *isight)
 346 {
 347         __be32 sample_rate;
 348         unsigned int i;
 349         int err;
 350
 351         if (isight->context) {
 352                 if (isight->packet_index < 0)
 353                         isight_stop_streaming(isight);
 354                 else
 355                         return 0;
 356         }
 357
 358         sample_rate = cpu_to_be32(RATE_48000);
 359         err = snd_fw_transaction(isight->unit, TCODE_WRITE_QUADLET_REQUEST,
 360                                  isight->audio_base + REG_SAMPLE_RATE,
 361                                  &sample_rate, 4);
 362         if (err < 0)
 363                 return err;
 364
 365         err = isight_connect(isight);
 366         if (err < 0)
 367                 goto error;
 368
 369         isight->context = fw_iso_context_create(isight->device->card,
 370                                                 FW_ISO_CONTEXT_RECEIVE,
 371                                                 isight->resources.channel,
 372                                                 isight->device->max_speed,
 373                                                 4, isight_packet, isight);
 374         if (IS_ERR(isight->context)) {
 375                 err = PTR_ERR(isight->context);
 376                 isight->context = NULL;
 377                 goto err_resources;
 378         }
 379
 380         for (i = 0; i < QUEUE_LENGTH; ++i) {
 381                 err = fw_iso_context_queue(isight->context, &audio_packet,
 382                                            &isight->buffer.iso_buffer,
 383                                            isight->buffer.packets[i].offset);
 384                 if (err < 0)
 385                         goto err_context;
 386         }
 387
 388         isight->first_packet = true;
 389         isight->packet_index = 0;
 390
 391         err = fw_iso_context_start(isight->context, -1, 0,
 392                                    FW_ISO_CONTEXT_MATCH_ALL_TAGS/*?*/);
 393         if (err < 0)
 394                 goto err_context;
 395
 396         return 0;
 397
 398 err_context:
 399         fw_iso_context_destroy(isight->context);
 400         isight->context = NULL;
 401 err_resources:
 402         fw_iso_resources_free(&isight->resources);
 403 error:
 404         return err;
 405 }
 406
 407 static int isight_prepare(struct snd_pcm_substream *substream)
 408 {
 409         struct isight *isight = substream->private_data;
 410         int err;
 411
 412         isight->buffer_pointer = 0;
 413         isight->period_counter = 0;
 414
 415         mutex_lock(&isight->mutex);
 416         err = isight_start_streaming(isight);
 417         mutex_unlock(&isight->mutex);
 418
 419         return err;
 420 }
 421
 422 static int isight_trigger(struct snd_pcm_substream *substream, int cmd)
 423 {
 424         struct isight *isight = substream->private_data;
 425
 426         switch (cmd) {
 427         case SNDRV_PCM_TRIGGER_START:
 428                 ACCESS_ONCE(isight->pcm_running) = true;
 429                 break;
 430         case SNDRV_PCM_TRIGGER_STOP:
 431                 ACCESS_ONCE(isight->pcm_running) = false;
 432                 break;
 433         default:
 434                 return -EINVAL;
 435         }
 436         return 0;
 437 }
 438
 439 static snd_pcm_uframes_t isight_pointer(struct snd_pcm_substream *substream)
 440 {
 441         struct isight *isight = substream->private_data;
 442
 443         return ACCESS_ONCE(isight->buffer_pointer);
 444 }
 445
 446 static int isight_create_pcm(struct isight *isight)
 447 {
 448         static struct snd_pcm_ops ops = {
 449                 .open      = isight_open,
 450                 .close     = isight_close,
 451                 .ioctl     = snd_pcm_lib_ioctl,
 452                 .hw_params = isight_hw_params,
 453                 .hw_free   = isight_hw_free,
 454                 .prepare   = isight_prepare,
 455                 .trigger   = isight_trigger,
 456                 .pointer   = isight_pointer,
 457                 .page      = snd_pcm_lib_get_vmalloc_page,
 458                 .mmap      = snd_pcm_lib_mmap_vmalloc,
 459         };
 460         struct snd_pcm *pcm;
 461         int err;
 462
 463         err = snd_pcm_new(isight->card, "iSight", 0, 0, 1, &pcm);
 464         if (err < 0)
 465                 return err;
 466         pcm->private_data = isight;
 467         strcpy(pcm->name, "iSight");
 468         isight->pcm = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
 469         isight->pcm->ops = &ops;
 470
 471         return 0;
 472 }
 473
 474 static int isight_gain_info(struct snd_kcontrol *ctl,
 475                             struct snd_ctl_elem_info *info)
 476 {
 477         struct isight *isight = ctl->private_data;
 478
 479         info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 480         info->count = 1;
 481         info->value.integer.min = isight->gain_min;
 482         info->value.integer.max = isight->gain_max;
 483
 484         return 0;
 485 }
 486
 487 static int isight_gain_get(struct snd_kcontrol *ctl,
 488                            struct snd_ctl_elem_value *value)
 489 {
 490         struct isight *isight = ctl->private_data;
 491         __be32 gain;
 492         int err;
 493
 494         err = snd_fw_transaction(isight->unit, TCODE_READ_QUADLET_REQUEST,
 495                                  isight->audio_base + REG_GAIN, &gain, 4);
 496         if (err < 0)
 497                 return err;
 498
 499         value->value.integer.value[0] = (s32)be32_to_cpu(gain);
 500
 501         return 0;
 502 }
 503
 504 static int isight_gain_put(struct snd_kcontrol *ctl,
 505                            struct snd_ctl_elem_value *value)
 506 {
 507         struct isight *isight = ctl->private_data;
 508         __be32 gain;
 509
 510         if (value->value.integer.value[0] < isight->gain_min ||
 511             value->value.integer.value[0] > isight->gain_max)
 512                 return -EINVAL;
 513
 514         gain = cpu_to_be32(value->value.integer.value[0]);
 515         return snd_fw_transaction(isight->unit, TCODE_WRITE_QUADLET_REQUEST,
 516                                   isight->audio_base + REG_GAIN, &gain, 4);
 517 }
 518
 519 static int isight_mute_get(struct snd_kcontrol *ctl,
 520                            struct snd_ctl_elem_value *value)
 521 {
 522         struct isight *isight = ctl->private_data;
 523         __be32 mute;
 524         int err;
 525
 526         err = snd_fw_transaction(isight->unit, TCODE_READ_QUADLET_REQUEST,
 527                                  isight->audio_base + REG_MUTE, &mute, 4);
 528         if (err < 0)
 529                 return err;
 530
 531         value->value.integer.value[0] = !mute;
 532
 533         return 0;
 534 }
 535
 536 static int isight_mute_put(struct snd_kcontrol *ctl,
 537                            struct snd_ctl_elem_value *value)
 538 {
 539         struct isight *isight = ctl->private_data;
 540         __be32 mute;
 541
 542         mute = (__force __be32)!value->value.integer.value[0];
 543         return snd_fw_transaction(isight->unit, TCODE_WRITE_QUADLET_REQUEST,
 544                                   isight->audio_base + REG_MUTE, &mute, 4);
 545 }
 546
 547 static int isight_create_mixer(struct isight *isight)
 548 {
 549         static const struct snd_kcontrol_new gain_control = {
 550                 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 551                 .name = "Mic Capture Volume",
 552                 .access = SNDRV_CTL_ELEM_ACCESS_READWRITE |
 553                         SNDRV_CTL_ELEM_ACCESS_TLV_READ,
 554                 .info = isight_gain_info,
 555                 .get = isight_gain_get,
 556                 .put = isight_gain_put,
 557         };
 558         static const struct snd_kcontrol_new mute_control = {
 559                 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 560                 .name = "Mic Capture Switch",
 561                 .info = snd_ctl_boolean_mono_info,
 562                 .get = isight_mute_get,
 563                 .put = isight_mute_put,
 564         };
 565         __be32 value;
 566         struct snd_kcontrol *ctl;
 567         int err;
 568
 569         err = snd_fw_transaction(isight->unit, TCODE_READ_QUADLET_REQUEST,
 570                                  isight->audio_base + REG_GAIN_RAW_START,
 571                                  &value, 4);
 572         if (err < 0)
 573                 return err;
 574         isight->gain_min = be32_to_cpu(value);
 575
 576         err = snd_fw_transaction(isight->unit, TCODE_READ_QUADLET_REQUEST,
 577                                  isight->audio_base + REG_GAIN_RAW_END,
 578                                  &value, 4);
 579         if (err < 0)
 580                 return err;
 581         isight->gain_max = be32_to_cpu(value);
 582
 583         isight->gain_tlv[0] = SNDRV_CTL_TLVT_DB_MINMAX;
 584         isight->gain_tlv[1] = 2 * sizeof(unsigned int);
 585         err = snd_fw_transaction(isight->unit, TCODE_READ_QUADLET_REQUEST,
 586                                  isight->audio_base + REG_GAIN_DB_START,
 587                                  &value, 4);
 588         if (err < 0)
 589                 return err;
 590         isight->gain_tlv[2] = (s32)be32_to_cpu(value) * 100;
 591         err = snd_fw_transaction(isight->unit, TCODE_READ_QUADLET_REQUEST,
 592                                  isight->audio_base + REG_GAIN_DB_END,
 593                                  &value, 4);
 594         if (err < 0)
 595                 return err;
 596         isight->gain_tlv[3] = (s32)be32_to_cpu(value) * 100;
 597
 598         ctl = snd_ctl_new1(&gain_control, isight);
 599         if (ctl)
 600                 ctl->tlv.p = isight->gain_tlv;
 601         err = snd_ctl_add(isight->card, ctl);
 602         if (err < 0)
 603                 return err;
 604
 605         err = snd_ctl_add(isight->card, snd_ctl_new1(&mute_control, isight));
 606         if (err < 0)
 607                 return err;
 608
 609         return 0;
 610 }
 611
 612 static void isight_card_free(struct snd_card *card)
 613 {
 614         struct isight *isight = card->private_data;
 615
 616         fw_iso_resources_destroy(&isight->resources);
 617         fw_unit_put(isight->unit);
 618         fw_device_put(isight->device);
 619         mutex_destroy(&isight->mutex);
 620 }
 621
 622 static u64 get_unit_base(struct fw_unit *unit)
 623 {
 624         struct fw_csr_iterator i;
 625         int key, value;
 626
 627         fw_csr_iterator_init(&i, unit->directory);
 628         while (fw_csr_iterator_next(&i, &key, &value))
 629                 if (key == CSR_OFFSET)
 630                         return CSR_REGISTER_BASE + value * 4;
 631         return 0;
 632 }
 633
 634 static int isight_probe(struct device *unit_dev)
 635 {
 636         struct fw_unit *unit = fw_unit(unit_dev);
 637         struct fw_device *fw_dev = fw_parent_device(unit);
 638         struct snd_card *card;
 639         struct isight *isight;
 640         int err;
 641
 642         err = snd_card_create(-1, NULL, THIS_MODULE, sizeof(*isight), &card);
 643         if (err < 0)
 644                 return err;
 645         snd_card_set_dev(card, unit_dev);
 646
 647         isight = card->private_data;
 648         isight->card = card;
 649         mutex_init(&isight->mutex);
 650         isight->unit = fw_unit_get(unit);
 651         isight->device = fw_device_get(fw_dev);
 652         isight->audio_base = get_unit_base(unit);
 653         if (!isight->audio_base) {
 654                 dev_err(&unit->device, "audio unit base not found\n");
 655                 err = -ENXIO;
 656                 goto err_unit;
 657         }
 658         fw_iso_resources_init(&isight->resources, unit);
 659
 660         card->private_free = isight_card_free;
 661
 662         strcpy(card->driver, "iSight");
 663         strcpy(card->shortname, "Apple iSight");
 664         snprintf(card->longname, sizeof(card->longname),
 665                  "Apple iSight (GUID %08x%08x) at %s, S%d",
 666                  fw_dev->config_rom[3], fw_dev->config_rom[4],
 667                  dev_name(&unit->device), 100 << fw_dev->max_speed);
 668         strcpy(card->mixername, "iSight");
 669
 670         err = isight_create_pcm(isight);
 671         if (err < 0)
 672                 goto error;
 673
 674         err = isight_create_mixer(isight);
 675         if (err < 0)
 676                 goto error;
 677
 678         err = snd_card_register(card);
 679         if (err < 0)
 680                 goto error;
 681
 682         dev_set_drvdata(unit_dev, isight);
 683
 684         return 0;
 685
 686 err_unit:
 687         fw_unit_put(isight->unit);
 688         fw_device_put(isight->device);
 689         mutex_destroy(&isight->mutex);
 690 error:
 691         snd_card_free(card);
 692         return err;
 693 }
 694
 695 static int isight_remove(struct device *dev)
 696 {
 697         struct isight *isight = dev_get_drvdata(dev);
 698
 699         snd_card_disconnect(isight->card);
 700
 701         mutex_lock(&isight->mutex);
 702         isight_pcm_abort(isight);
 703         isight_stop_streaming(isight);
 704         mutex_unlock(&isight->mutex);
 705
 706         snd_card_free_when_closed(isight->card);
 707
 708         return 0;
 709 }
 710
 711 static void isight_bus_reset(struct fw_unit *unit)
 712 {
 713         struct isight *isight = dev_get_drvdata(&unit->device);
 714
 715         mutex_lock(&isight->mutex);
 716         if (fw_iso_resources_update(&isight->resources) < 0) {
 717                 isight_pcm_abort(isight);
 718                 isight_stop_streaming(isight);
 719         }
 720         mutex_unlock(&isight->mutex);
 721 }
 722
 723 static const struct ieee1394_device_id isight_id_table[] = {
 724         {
 725                 .match_flags  = IEEE1394_MATCH_SPECIFIER_ID |
 726                                 IEEE1394_MATCH_VERSION,
 727                 .specifier_id = OUI_APPLE,
 728                 .version      = SW_ISIGHT_AUDIO,
 729         },
 730         { }
 731 };
 732 MODULE_DEVICE_TABLE(ieee1394, isight_id_table);
 733
 734 static struct fw_driver isight_driver = {
 735         .driver   = {
 736                 .owner  = THIS_MODULE,
 737                 .name   = KBUILD_MODNAME,
 738                 .bus    = &fw_bus_type,
 739                 .probe  = isight_probe,
 740                 .remove = isight_remove,
 741         },
 742         .update   = isight_bus_reset,
 743         .id_table = isight_id_table,
 744 };
 745
 746 static int __init alsa_isight_init(void)
 747 {
 748         return driver_register(&isight_driver.driver);
 749 }
 750
 751 static void __exit alsa_isight_exit(void)
 752 {
 753         driver_unregister(&isight_driver.driver);
 754 }
 755
 756 module_init(alsa_isight_init);
 757 module_exit(alsa_isight_exit);