440030818db70c88c582d0047790baed074297c9
[linux-2.6.git] / 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);