Version:  2.0.40 2.2.26 2.4.37 2.6.39 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15

Linux/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);
749 

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