1a8da2614db66a981ca0861121fba242e250cf53
[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 <linux/delay.h>
9 #include <linux/device.h>
10 #include <linux/firewire.h>
11 #include <linux/firewire-constants.h>
12 #include <linux/module.h>
13 #include <linux/mod_devicetable.h>
14 #include <linux/mutex.h>
15 #include <linux/string.h>
16 #include <sound/control.h>
17 #include <sound/core.h>
18 #include <sound/initval.h>
19 #include <sound/pcm.h>
20 #include <sound/tlv.h>
21 #include "lib.h"
22 #include "iso-resources.h"
23 #include "packets-buffer.h"
24
25 #define OUI_APPLE               0x000a27
26 #define MODEL_APPLE_ISIGHT      0x000008
27 #define SW_ISIGHT_AUDIO         0x000010
28
29 #define REG_AUDIO_ENABLE        0x000
30 #define  AUDIO_ENABLE           0x80000000
31 #define REG_DEF_AUDIO_GAIN      0x204
32 #define REG_GAIN_RAW_START      0x210
33 #define REG_GAIN_RAW_END        0x214
34 #define REG_GAIN_DB_START       0x218
35 #define REG_GAIN_DB_END         0x21c
36 #define REG_SAMPLE_RATE_INQUIRY 0x280
37 #define REG_ISO_TX_CONFIG       0x300
38 #define  SPEED_SHIFT            16
39 #define REG_SAMPLE_RATE         0x400
40 #define  RATE_48000             0x80000000
41 #define REG_GAIN                0x500
42 #define REG_MUTE                0x504
43
44 #define MAX_FRAMES_PER_PACKET   475
45
46 #define QUEUE_LENGTH            20
47
48 struct isight {
49         struct snd_card *card;
50         struct fw_unit *unit;
51         struct fw_device *device;
52         u64 audio_base;
53         struct fw_address_handler iris_handler;
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
212         if (++index >= QUEUE_LENGTH)
213                 index = 0;
214         isight->packet_index = index;
215 }
216
217 static int isight_connect(struct isight *isight)
218 {
219         int ch, err, rcode, errors = 0;
220         __be32 value;
221
222 retry_after_bus_reset:
223         ch = fw_iso_resources_allocate(&isight->resources,
224                                        sizeof(struct audio_payload),
225                                        isight->device->max_speed);
226         if (ch < 0) {
227                 err = ch;
228                 goto error;
229         }
230
231         value = cpu_to_be32(ch | (isight->device->max_speed << SPEED_SHIFT));
232         for (;;) {
233                 rcode = fw_run_transaction(
234                                 isight->device->card,
235                                 TCODE_WRITE_QUADLET_REQUEST,
236                                 isight->device->node_id,
237                                 isight->resources.generation,
238                                 isight->device->max_speed,
239                                 isight->audio_base + REG_ISO_TX_CONFIG,
240                                 &value, 4);
241                 if (rcode == RCODE_COMPLETE) {
242                         return 0;
243                 } else if (rcode == RCODE_GENERATION) {
244                         fw_iso_resources_free(&isight->resources);
245                         goto retry_after_bus_reset;
246                 } else if (rcode_is_permanent_error(rcode) || ++errors >= 3) {
247                         err = -EIO;
248                         goto err_resources;
249                 }
250                 msleep(5);
251         }
252
253 err_resources:
254         fw_iso_resources_free(&isight->resources);
255 error:
256         return err;
257 }
258
259 static int isight_open(struct snd_pcm_substream *substream)
260 {
261         static const struct snd_pcm_hardware hardware = {
262                 .info = SNDRV_PCM_INFO_MMAP |
263                         SNDRV_PCM_INFO_MMAP_VALID |
264                         SNDRV_PCM_INFO_BATCH |
265                         SNDRV_PCM_INFO_INTERLEAVED |
266                         SNDRV_PCM_INFO_BLOCK_TRANSFER,
267                 .formats = SNDRV_PCM_FMTBIT_S16_BE,
268                 .rates = SNDRV_PCM_RATE_48000,
269                 .rate_min = 48000,
270                 .rate_max = 48000,
271                 .channels_min = 2,
272                 .channels_max = 2,
273                 .buffer_bytes_max = 4 * 1024 * 1024,
274                 .period_bytes_min = MAX_FRAMES_PER_PACKET * 4,
275                 .period_bytes_max = 1024 * 1024,
276                 .periods_min = 2,
277                 .periods_max = UINT_MAX,
278         };
279         struct isight *isight = substream->private_data;
280
281         substream->runtime->hw = hardware;
282
283         return iso_packets_buffer_init(&isight->buffer, isight->unit,
284                                        QUEUE_LENGTH,
285                                        sizeof(struct audio_payload),
286                                        DMA_FROM_DEVICE);
287 }
288
289 static int isight_close(struct snd_pcm_substream *substream)
290 {
291         struct isight *isight = substream->private_data;
292
293         iso_packets_buffer_destroy(&isight->buffer, isight->unit);
294
295         return 0;
296 }
297
298 static int isight_hw_params(struct snd_pcm_substream *substream,
299                             struct snd_pcm_hw_params *hw_params)
300 {
301         struct isight *isight = substream->private_data;
302         int err;
303
304         err = snd_pcm_lib_alloc_vmalloc_buffer(substream,
305                                                params_buffer_bytes(hw_params));
306         if (err < 0)
307                 return err;
308
309         ACCESS_ONCE(isight->pcm_active) = true;
310
311         return 0;
312 }
313
314 static void isight_stop_streaming(struct isight *isight)
315 {
316         __be32 value;
317
318         if (!isight->context)
319                 return;
320
321         fw_iso_context_stop(isight->context);
322         fw_iso_context_destroy(isight->context);
323         isight->context = NULL;
324
325         value = 0;
326         snd_fw_transaction(isight->unit, TCODE_WRITE_QUADLET_REQUEST,
327                            isight->audio_base + REG_AUDIO_ENABLE,
328                            &value, 4);
329
330         fw_iso_resources_free(&isight->resources);
331 }
332
333 static int isight_hw_free(struct snd_pcm_substream *substream)
334 {
335         struct isight *isight = substream->private_data;
336
337         ACCESS_ONCE(isight->pcm_active) = false;
338
339         mutex_lock(&isight->mutex);
340         isight_stop_streaming(isight);
341         mutex_unlock(&isight->mutex);
342
343         return snd_pcm_lib_free_vmalloc_buffer(substream);
344 }
345
346 static int isight_start_streaming(struct isight *isight)
347 {
348         __be32 value;
349         unsigned int i;
350         int err;
351
352         if (isight->context) {
353                 if (isight->packet_index < 0)
354                         isight_stop_streaming(isight);
355                 else
356                         return 0;
357         }
358
359         value = cpu_to_be32(RATE_48000);
360         err = snd_fw_transaction(isight->unit, TCODE_WRITE_QUADLET_REQUEST,
361                                  isight->audio_base + REG_SAMPLE_RATE,
362                                  &value, 4);
363         if (err < 0)
364                 return err;
365
366         err = isight_connect(isight);
367         if (err < 0)
368                 goto error;
369
370         value = cpu_to_be32(AUDIO_ENABLE);
371         err = snd_fw_transaction(isight->unit, TCODE_WRITE_QUADLET_REQUEST,
372                                  isight->audio_base + REG_AUDIO_ENABLE,
373                                  &value, 4);
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         value = 0;
411         snd_fw_transaction(isight->unit, TCODE_WRITE_QUADLET_REQUEST,
412                            isight->audio_base + REG_AUDIO_ENABLE,
413                            &value, 4);
414         fw_iso_resources_free(&isight->resources);
415 error:
416         return err;
417 }
418
419 static int isight_prepare(struct snd_pcm_substream *substream)
420 {
421         struct isight *isight = substream->private_data;
422         int err;
423
424         isight->buffer_pointer = 0;
425         isight->period_counter = 0;
426
427         mutex_lock(&isight->mutex);
428         err = isight_start_streaming(isight);
429         mutex_unlock(&isight->mutex);
430
431         return err;
432 }
433
434 static int isight_trigger(struct snd_pcm_substream *substream, int cmd)
435 {
436         struct isight *isight = substream->private_data;
437
438         switch (cmd) {
439         case SNDRV_PCM_TRIGGER_START:
440                 ACCESS_ONCE(isight->pcm_running) = true;
441                 break;
442         case SNDRV_PCM_TRIGGER_STOP:
443                 ACCESS_ONCE(isight->pcm_running) = false;
444                 break;
445         default:
446                 return -EINVAL;
447         }
448         return 0;
449 }
450
451 static snd_pcm_uframes_t isight_pointer(struct snd_pcm_substream *substream)
452 {
453         struct isight *isight = substream->private_data;
454
455         return ACCESS_ONCE(isight->buffer_pointer);
456 }
457
458 static int isight_create_pcm(struct isight *isight)
459 {
460         static struct snd_pcm_ops ops = {
461                 .open      = isight_open,
462                 .close     = isight_close,
463                 .ioctl     = snd_pcm_lib_ioctl,
464                 .hw_params = isight_hw_params,
465                 .hw_free   = isight_hw_free,
466                 .prepare   = isight_prepare,
467                 .trigger   = isight_trigger,
468                 .pointer   = isight_pointer,
469                 .page      = snd_pcm_lib_get_vmalloc_page,
470                 .mmap      = snd_pcm_lib_mmap_vmalloc,
471         };
472         struct snd_pcm *pcm;
473         int err;
474
475         err = snd_pcm_new(isight->card, "iSight", 0, 0, 1, &pcm);
476         if (err < 0)
477                 return err;
478         pcm->private_data = isight;
479         strcpy(pcm->name, "iSight");
480         isight->pcm = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
481         isight->pcm->ops = &ops;
482
483         return 0;
484 }
485
486 static int isight_gain_info(struct snd_kcontrol *ctl,
487                             struct snd_ctl_elem_info *info)
488 {
489         struct isight *isight = ctl->private_data;
490
491         info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
492         info->count = 1;
493         info->value.integer.min = isight->gain_min;
494         info->value.integer.max = isight->gain_max;
495
496         return 0;
497 }
498
499 static int isight_gain_get(struct snd_kcontrol *ctl,
500                            struct snd_ctl_elem_value *value)
501 {
502         struct isight *isight = ctl->private_data;
503         __be32 gain;
504         int err;
505
506         err = snd_fw_transaction(isight->unit, TCODE_READ_QUADLET_REQUEST,
507                                  isight->audio_base + REG_GAIN, &gain, 4);
508         if (err < 0)
509                 return err;
510
511         value->value.integer.value[0] = (s32)be32_to_cpu(gain);
512
513         return 0;
514 }
515
516 static int isight_gain_put(struct snd_kcontrol *ctl,
517                            struct snd_ctl_elem_value *value)
518 {
519         struct isight *isight = ctl->private_data;
520         __be32 gain;
521
522         if (value->value.integer.value[0] < isight->gain_min ||
523             value->value.integer.value[0] > isight->gain_max)
524                 return -EINVAL;
525
526         gain = cpu_to_be32(value->value.integer.value[0]);
527         return snd_fw_transaction(isight->unit, TCODE_WRITE_QUADLET_REQUEST,
528                                   isight->audio_base + REG_GAIN, &gain, 4);
529 }
530
531 static int isight_mute_get(struct snd_kcontrol *ctl,
532                            struct snd_ctl_elem_value *value)
533 {
534         struct isight *isight = ctl->private_data;
535         __be32 mute;
536         int err;
537
538         err = snd_fw_transaction(isight->unit, TCODE_READ_QUADLET_REQUEST,
539                                  isight->audio_base + REG_MUTE, &mute, 4);
540         if (err < 0)
541                 return err;
542
543         value->value.integer.value[0] = !mute;
544
545         return 0;
546 }
547
548 static int isight_mute_put(struct snd_kcontrol *ctl,
549                            struct snd_ctl_elem_value *value)
550 {
551         struct isight *isight = ctl->private_data;
552         __be32 mute;
553
554         mute = (__force __be32)!value->value.integer.value[0];
555         return snd_fw_transaction(isight->unit, TCODE_WRITE_QUADLET_REQUEST,
556                                   isight->audio_base + REG_MUTE, &mute, 4);
557 }
558
559 static int isight_create_mixer(struct isight *isight)
560 {
561         static const struct snd_kcontrol_new gain_control = {
562                 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
563                 .name = "Mic Capture Volume",
564                 .access = SNDRV_CTL_ELEM_ACCESS_READWRITE |
565                           SNDRV_CTL_ELEM_ACCESS_TLV_READ,
566                 .info = isight_gain_info,
567                 .get = isight_gain_get,
568                 .put = isight_gain_put,
569         };
570         static const struct snd_kcontrol_new mute_control = {
571                 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
572                 .name = "Mic Capture Switch",
573                 .info = snd_ctl_boolean_mono_info,
574                 .get = isight_mute_get,
575                 .put = isight_mute_put,
576         };
577         __be32 value;
578         struct snd_kcontrol *ctl;
579         int err;
580
581         err = snd_fw_transaction(isight->unit, TCODE_READ_QUADLET_REQUEST,
582                                  isight->audio_base + REG_GAIN_RAW_START,
583                                  &value, 4);
584         if (err < 0)
585                 return err;
586         isight->gain_min = be32_to_cpu(value);
587
588         err = snd_fw_transaction(isight->unit, TCODE_READ_QUADLET_REQUEST,
589                                  isight->audio_base + REG_GAIN_RAW_END,
590                                  &value, 4);
591         if (err < 0)
592                 return err;
593         isight->gain_max = be32_to_cpu(value);
594
595         isight->gain_tlv[0] = SNDRV_CTL_TLVT_DB_MINMAX;
596         isight->gain_tlv[1] = 2 * sizeof(unsigned int);
597         err = snd_fw_transaction(isight->unit, TCODE_READ_QUADLET_REQUEST,
598                                  isight->audio_base + REG_GAIN_DB_START,
599                                  &value, 4);
600         if (err < 0)
601                 return err;
602         isight->gain_tlv[2] = (s32)be32_to_cpu(value) * 100;
603         err = snd_fw_transaction(isight->unit, TCODE_READ_QUADLET_REQUEST,
604                                  isight->audio_base + REG_GAIN_DB_END,
605                                  &value, 4);
606         if (err < 0)
607                 return err;
608         isight->gain_tlv[3] = (s32)be32_to_cpu(value) * 100;
609
610         ctl = snd_ctl_new1(&gain_control, isight);
611         if (ctl)
612                 ctl->tlv.p = isight->gain_tlv;
613         err = snd_ctl_add(isight->card, ctl);
614         if (err < 0)
615                 return err;
616
617         err = snd_ctl_add(isight->card, snd_ctl_new1(&mute_control, isight));
618         if (err < 0)
619                 return err;
620
621         return 0;
622 }
623
624 static void isight_card_free(struct snd_card *card)
625 {
626         struct isight *isight = card->private_data;
627
628         fw_iso_resources_destroy(&isight->resources);
629         fw_unit_put(isight->unit);
630         fw_device_put(isight->device);
631         mutex_destroy(&isight->mutex);
632 }
633
634 static u64 get_unit_base(struct fw_unit *unit)
635 {
636         struct fw_csr_iterator i;
637         int key, value;
638
639         fw_csr_iterator_init(&i, unit->directory);
640         while (fw_csr_iterator_next(&i, &key, &value))
641                 if (key == CSR_OFFSET)
642                         return CSR_REGISTER_BASE + value * 4;
643         return 0;
644 }
645
646 static int isight_probe(struct device *unit_dev)
647 {
648         struct fw_unit *unit = fw_unit(unit_dev);
649         struct fw_device *fw_dev = fw_parent_device(unit);
650         struct snd_card *card;
651         struct isight *isight;
652         int err;
653
654         err = snd_card_create(-1, NULL, THIS_MODULE, sizeof(*isight), &card);
655         if (err < 0)
656                 return err;
657         snd_card_set_dev(card, unit_dev);
658
659         isight = card->private_data;
660         isight->card = card;
661         mutex_init(&isight->mutex);
662         isight->unit = fw_unit_get(unit);
663         isight->device = fw_device_get(fw_dev);
664         isight->audio_base = get_unit_base(unit);
665         if (!isight->audio_base) {
666                 dev_err(&unit->device, "audio unit base not found\n");
667                 err = -ENXIO;
668                 goto err_unit;
669         }
670         fw_iso_resources_init(&isight->resources, unit);
671
672         card->private_free = isight_card_free;
673
674         strcpy(card->driver, "iSight");
675         strcpy(card->shortname, "Apple iSight");
676         snprintf(card->longname, sizeof(card->longname),
677                  "Apple iSight (GUID %08x%08x) at %s, S%d",
678                  fw_dev->config_rom[3], fw_dev->config_rom[4],
679                  dev_name(&unit->device), 100 << fw_dev->max_speed);
680         strcpy(card->mixername, "iSight");
681
682         err = isight_create_pcm(isight);
683         if (err < 0)
684                 goto error;
685
686         err = isight_create_mixer(isight);
687         if (err < 0)
688                 goto error;
689
690         err = snd_card_register(card);
691         if (err < 0)
692                 goto error;
693
694         dev_set_drvdata(unit_dev, isight);
695
696         return 0;
697
698 err_unit:
699         fw_unit_put(isight->unit);
700         fw_device_put(isight->device);
701         mutex_destroy(&isight->mutex);
702 error:
703         snd_card_free(card);
704         return err;
705 }
706
707 static int isight_remove(struct device *dev)
708 {
709         struct isight *isight = dev_get_drvdata(dev);
710
711         snd_card_disconnect(isight->card);
712
713         mutex_lock(&isight->mutex);
714         isight_pcm_abort(isight);
715         isight_stop_streaming(isight);
716         mutex_unlock(&isight->mutex);
717
718         snd_card_free_when_closed(isight->card);
719
720         return 0;
721 }
722
723 static void isight_bus_reset(struct fw_unit *unit)
724 {
725         struct isight *isight = dev_get_drvdata(&unit->device);
726
727         mutex_lock(&isight->mutex);
728         if (fw_iso_resources_update(&isight->resources) < 0) {
729                 isight_pcm_abort(isight);
730                 isight_stop_streaming(isight);
731         }
732         mutex_unlock(&isight->mutex);
733 }
734
735 static const struct ieee1394_device_id isight_id_table[] = {
736         {
737                 .match_flags  = IEEE1394_MATCH_SPECIFIER_ID |
738                                 IEEE1394_MATCH_VERSION,
739                 .specifier_id = OUI_APPLE,
740                 .version      = SW_ISIGHT_AUDIO,
741         },
742         { }
743 };
744 MODULE_DEVICE_TABLE(ieee1394, isight_id_table);
745
746 static struct fw_driver isight_driver = {
747         .driver   = {
748                 .owner  = THIS_MODULE,
749                 .name   = KBUILD_MODNAME,
750                 .bus    = &fw_bus_type,
751                 .probe  = isight_probe,
752                 .remove = isight_remove,
753         },
754         .update   = isight_bus_reset,
755         .id_table = isight_id_table,
756 };
757
758 static int __init alsa_isight_init(void)
759 {
760         return driver_register(&isight_driver.driver);
761 }
762
763 static void __exit alsa_isight_exit(void)
764 {
765         driver_unregister(&isight_driver.driver);
766 }
767
768 module_init(alsa_isight_init);
769 module_exit(alsa_isight_exit);