1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Apple iSight audio driver
4 *
5 * Copyright (c) Clemens Ladisch <clemens@ladisch.de>
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/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 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");
80
81 static struct fw_iso_packet audio_packet = {
82 .payload_length = sizeof(struct audio_payload),
83 .interrupt = 1,
84 .header_length = 4,
85 };
86
isight_update_pointers(struct isight * isight,unsigned int count)87 static void isight_update_pointers(struct isight *isight, unsigned int count)
88 {
89 struct snd_pcm_runtime *runtime = isight->pcm->runtime;
90 unsigned int ptr;
91
92 smp_wmb(); /* update buffer data before buffer pointer */
93
94 ptr = isight->buffer_pointer;
95 ptr += count;
96 if (ptr >= runtime->buffer_size)
97 ptr -= runtime->buffer_size;
98 WRITE_ONCE(isight->buffer_pointer, ptr);
99
100 isight->period_counter += count;
101 if (isight->period_counter >= runtime->period_size) {
102 isight->period_counter -= runtime->period_size;
103 snd_pcm_period_elapsed(isight->pcm);
104 }
105 }
106
isight_samples(struct isight * isight,const __be16 * samples,unsigned int count)107 static void isight_samples(struct isight *isight,
108 const __be16 *samples, unsigned int count)
109 {
110 struct snd_pcm_runtime *runtime;
111 unsigned int count1;
112
113 if (!READ_ONCE(isight->pcm_running))
114 return;
115
116 runtime = isight->pcm->runtime;
117 if (isight->buffer_pointer + count <= runtime->buffer_size) {
118 memcpy(runtime->dma_area + isight->buffer_pointer * 4,
119 samples, count * 4);
120 } else {
121 count1 = runtime->buffer_size - isight->buffer_pointer;
122 memcpy(runtime->dma_area + isight->buffer_pointer * 4,
123 samples, count1 * 4);
124 samples += count1 * 2;
125 memcpy(runtime->dma_area, samples, (count - count1) * 4);
126 }
127
128 isight_update_pointers(isight, count);
129 }
130
isight_pcm_abort(struct isight * isight)131 static void isight_pcm_abort(struct isight *isight)
132 {
133 if (READ_ONCE(isight->pcm_active))
134 snd_pcm_stop_xrun(isight->pcm);
135 }
136
isight_dropped_samples(struct isight * isight,unsigned int total)137 static void isight_dropped_samples(struct isight *isight, unsigned int total)
138 {
139 struct snd_pcm_runtime *runtime;
140 u32 dropped;
141 unsigned int count1;
142
143 if (!READ_ONCE(isight->pcm_running))
144 return;
145
146 runtime = isight->pcm->runtime;
147 dropped = total - isight->total_samples;
148 if (dropped < runtime->buffer_size) {
149 if (isight->buffer_pointer + dropped <= runtime->buffer_size) {
150 memset(runtime->dma_area + isight->buffer_pointer * 4,
151 0, dropped * 4);
152 } else {
153 count1 = runtime->buffer_size - isight->buffer_pointer;
154 memset(runtime->dma_area + isight->buffer_pointer * 4,
155 0, count1 * 4);
156 memset(runtime->dma_area, 0, (dropped - count1) * 4);
157 }
158 isight_update_pointers(isight, dropped);
159 } else {
160 isight_pcm_abort(isight);
161 }
162 }
163
isight_packet(struct fw_iso_context * context,u32 cycle,size_t header_length,void * header,void * data)164 static void isight_packet(struct fw_iso_context *context, u32 cycle,
165 size_t header_length, void *header, void *data)
166 {
167 struct isight *isight = data;
168 const struct audio_payload *payload;
169 unsigned int index, length, count, total;
170 int err;
171
172 if (isight->packet_index < 0)
173 return;
174 index = isight->packet_index;
175 payload = isight->buffer.packets[index].buffer;
176 length = be32_to_cpup(header) >> 16;
177
178 if (likely(length >= 16 &&
179 payload->signature == cpu_to_be32(0x73676874/*"sght"*/))) {
180 count = be32_to_cpu(payload->sample_count);
181 if (likely(count <= (length - 16) / 4 &&
182 count <= MAX_FRAMES_PER_PACKET)) {
183 total = be32_to_cpu(payload->sample_total);
184 if (unlikely(total != isight->total_samples)) {
185 if (!isight->first_packet)
186 isight_dropped_samples(isight, total);
187 isight->first_packet = false;
188 isight->total_samples = total;
189 }
190
191 isight_samples(isight, payload->samples, count);
192 isight->total_samples += count;
193 }
194 }
195
196 err = fw_iso_context_queue(isight->context, &audio_packet,
197 &isight->buffer.iso_buffer,
198 isight->buffer.packets[index].offset);
199 if (err < 0) {
200 dev_err(&isight->unit->device, "queueing error: %d\n", err);
201 isight_pcm_abort(isight);
202 isight->packet_index = -1;
203 return;
204 }
205 fw_iso_context_queue_flush(isight->context);
206
207 if (++index >= QUEUE_LENGTH)
208 index = 0;
209 isight->packet_index = index;
210 }
211
isight_connect(struct isight * isight)212 static int isight_connect(struct isight *isight)
213 {
214 int ch, err;
215 __be32 value;
216
217 retry_after_bus_reset:
218 ch = fw_iso_resources_allocate(&isight->resources,
219 sizeof(struct audio_payload),
220 isight->device->max_speed);
221 if (ch < 0) {
222 err = ch;
223 goto error;
224 }
225
226 value = cpu_to_be32(ch | (isight->device->max_speed << SPEED_SHIFT));
227 err = snd_fw_transaction(isight->unit, TCODE_WRITE_QUADLET_REQUEST,
228 isight->audio_base + REG_ISO_TX_CONFIG,
229 &value, 4, FW_FIXED_GENERATION |
230 isight->resources.generation);
231 if (err == -EAGAIN) {
232 fw_iso_resources_free(&isight->resources);
233 goto retry_after_bus_reset;
234 } else if (err < 0) {
235 goto err_resources;
236 }
237
238 return 0;
239
240 err_resources:
241 fw_iso_resources_free(&isight->resources);
242 error:
243 return err;
244 }
245
isight_open(struct snd_pcm_substream * substream)246 static int isight_open(struct snd_pcm_substream *substream)
247 {
248 static const struct snd_pcm_hardware hardware = {
249 .info = SNDRV_PCM_INFO_MMAP |
250 SNDRV_PCM_INFO_MMAP_VALID |
251 SNDRV_PCM_INFO_BATCH |
252 SNDRV_PCM_INFO_INTERLEAVED |
253 SNDRV_PCM_INFO_BLOCK_TRANSFER,
254 .formats = SNDRV_PCM_FMTBIT_S16_BE,
255 .rates = SNDRV_PCM_RATE_48000,
256 .rate_min = 48000,
257 .rate_max = 48000,
258 .channels_min = 2,
259 .channels_max = 2,
260 .buffer_bytes_max = 4 * 1024 * 1024,
261 .period_bytes_min = MAX_FRAMES_PER_PACKET * 4,
262 .period_bytes_max = 1024 * 1024,
263 .periods_min = 2,
264 .periods_max = UINT_MAX,
265 };
266 struct isight *isight = substream->private_data;
267
268 substream->runtime->hw = hardware;
269
270 return iso_packets_buffer_init(&isight->buffer, isight->unit,
271 QUEUE_LENGTH,
272 sizeof(struct audio_payload),
273 DMA_FROM_DEVICE);
274 }
275
isight_close(struct snd_pcm_substream * substream)276 static int isight_close(struct snd_pcm_substream *substream)
277 {
278 struct isight *isight = substream->private_data;
279
280 iso_packets_buffer_destroy(&isight->buffer, isight->unit);
281
282 return 0;
283 }
284
isight_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * hw_params)285 static int isight_hw_params(struct snd_pcm_substream *substream,
286 struct snd_pcm_hw_params *hw_params)
287 {
288 struct isight *isight = substream->private_data;
289
290 WRITE_ONCE(isight->pcm_active, true);
291
292 return 0;
293 }
294
reg_read(struct isight * isight,int offset,__be32 * value)295 static int reg_read(struct isight *isight, int offset, __be32 *value)
296 {
297 return snd_fw_transaction(isight->unit, TCODE_READ_QUADLET_REQUEST,
298 isight->audio_base + offset, value, 4, 0);
299 }
300
reg_write(struct isight * isight,int offset,__be32 value)301 static int reg_write(struct isight *isight, int offset, __be32 value)
302 {
303 return snd_fw_transaction(isight->unit, TCODE_WRITE_QUADLET_REQUEST,
304 isight->audio_base + offset, &value, 4, 0);
305 }
306
isight_stop_streaming(struct isight * isight)307 static void isight_stop_streaming(struct isight *isight)
308 {
309 __be32 value;
310
311 if (!isight->context)
312 return;
313
314 fw_iso_context_stop(isight->context);
315 fw_iso_context_destroy(isight->context);
316 isight->context = NULL;
317 fw_iso_resources_free(&isight->resources);
318 value = 0;
319 snd_fw_transaction(isight->unit, TCODE_WRITE_QUADLET_REQUEST,
320 isight->audio_base + REG_AUDIO_ENABLE,
321 &value, 4, FW_QUIET);
322 }
323
isight_hw_free(struct snd_pcm_substream * substream)324 static int isight_hw_free(struct snd_pcm_substream *substream)
325 {
326 struct isight *isight = substream->private_data;
327
328 WRITE_ONCE(isight->pcm_active, false);
329
330 guard(mutex)(&isight->mutex);
331 isight_stop_streaming(isight);
332
333 return 0;
334 }
335
isight_start_streaming(struct isight * isight)336 static int isight_start_streaming(struct isight *isight)
337 {
338 unsigned int i;
339 int err;
340
341 if (isight->context) {
342 if (isight->packet_index < 0)
343 isight_stop_streaming(isight);
344 else
345 return 0;
346 }
347
348 err = reg_write(isight, REG_SAMPLE_RATE, cpu_to_be32(RATE_48000));
349 if (err < 0)
350 goto error;
351
352 err = isight_connect(isight);
353 if (err < 0)
354 goto error;
355
356 err = reg_write(isight, REG_AUDIO_ENABLE, cpu_to_be32(AUDIO_ENABLE));
357 if (err < 0)
358 goto err_resources;
359
360 isight->context = fw_iso_context_create(isight->device->card,
361 FW_ISO_CONTEXT_RECEIVE,
362 isight->resources.channel,
363 isight->device->max_speed,
364 4, isight_packet, isight);
365 if (IS_ERR(isight->context)) {
366 err = PTR_ERR(isight->context);
367 isight->context = NULL;
368 goto err_resources;
369 }
370
371 for (i = 0; i < QUEUE_LENGTH; ++i) {
372 err = fw_iso_context_queue(isight->context, &audio_packet,
373 &isight->buffer.iso_buffer,
374 isight->buffer.packets[i].offset);
375 if (err < 0)
376 goto err_context;
377 }
378
379 isight->first_packet = true;
380 isight->packet_index = 0;
381
382 err = fw_iso_context_start(isight->context, -1, 0,
383 FW_ISO_CONTEXT_MATCH_ALL_TAGS/*?*/);
384 if (err < 0)
385 goto err_context;
386
387 return 0;
388
389 err_context:
390 fw_iso_context_destroy(isight->context);
391 isight->context = NULL;
392 err_resources:
393 fw_iso_resources_free(&isight->resources);
394 reg_write(isight, REG_AUDIO_ENABLE, 0);
395 error:
396 return err;
397 }
398
isight_prepare(struct snd_pcm_substream * substream)399 static int isight_prepare(struct snd_pcm_substream *substream)
400 {
401 struct isight *isight = substream->private_data;
402
403 isight->buffer_pointer = 0;
404 isight->period_counter = 0;
405
406 guard(mutex)(&isight->mutex);
407 return isight_start_streaming(isight);
408 }
409
isight_trigger(struct snd_pcm_substream * substream,int cmd)410 static int isight_trigger(struct snd_pcm_substream *substream, int cmd)
411 {
412 struct isight *isight = substream->private_data;
413
414 switch (cmd) {
415 case SNDRV_PCM_TRIGGER_START:
416 WRITE_ONCE(isight->pcm_running, true);
417 break;
418 case SNDRV_PCM_TRIGGER_STOP:
419 WRITE_ONCE(isight->pcm_running, false);
420 break;
421 default:
422 return -EINVAL;
423 }
424 return 0;
425 }
426
isight_pointer(struct snd_pcm_substream * substream)427 static snd_pcm_uframes_t isight_pointer(struct snd_pcm_substream *substream)
428 {
429 struct isight *isight = substream->private_data;
430
431 return READ_ONCE(isight->buffer_pointer);
432 }
433
isight_create_pcm(struct isight * isight)434 static int isight_create_pcm(struct isight *isight)
435 {
436 static const struct snd_pcm_ops ops = {
437 .open = isight_open,
438 .close = isight_close,
439 .hw_params = isight_hw_params,
440 .hw_free = isight_hw_free,
441 .prepare = isight_prepare,
442 .trigger = isight_trigger,
443 .pointer = isight_pointer,
444 };
445 struct snd_pcm *pcm;
446 int err;
447
448 err = snd_pcm_new(isight->card, "iSight", 0, 0, 1, &pcm);
449 if (err < 0)
450 return err;
451 pcm->private_data = isight;
452 pcm->nonatomic = true;
453 strscpy(pcm->name, "iSight");
454 isight->pcm = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
455 isight->pcm->ops = &ops;
456 snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_VMALLOC, NULL, 0, 0);
457
458 return 0;
459 }
460
isight_gain_info(struct snd_kcontrol * ctl,struct snd_ctl_elem_info * info)461 static int isight_gain_info(struct snd_kcontrol *ctl,
462 struct snd_ctl_elem_info *info)
463 {
464 struct isight *isight = ctl->private_data;
465
466 info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
467 info->count = 1;
468 info->value.integer.min = isight->gain_min;
469 info->value.integer.max = isight->gain_max;
470
471 return 0;
472 }
473
isight_gain_get(struct snd_kcontrol * ctl,struct snd_ctl_elem_value * value)474 static int isight_gain_get(struct snd_kcontrol *ctl,
475 struct snd_ctl_elem_value *value)
476 {
477 struct isight *isight = ctl->private_data;
478 __be32 gain;
479 int err;
480
481 err = reg_read(isight, REG_GAIN, &gain);
482 if (err < 0)
483 return err;
484
485 value->value.integer.value[0] = (s32)be32_to_cpu(gain);
486
487 return 0;
488 }
489
isight_gain_put(struct snd_kcontrol * ctl,struct snd_ctl_elem_value * value)490 static int isight_gain_put(struct snd_kcontrol *ctl,
491 struct snd_ctl_elem_value *value)
492 {
493 struct isight *isight = ctl->private_data;
494
495 if (value->value.integer.value[0] < isight->gain_min ||
496 value->value.integer.value[0] > isight->gain_max)
497 return -EINVAL;
498
499 return reg_write(isight, REG_GAIN,
500 cpu_to_be32(value->value.integer.value[0]));
501 }
502
isight_mute_get(struct snd_kcontrol * ctl,struct snd_ctl_elem_value * value)503 static int isight_mute_get(struct snd_kcontrol *ctl,
504 struct snd_ctl_elem_value *value)
505 {
506 struct isight *isight = ctl->private_data;
507 __be32 mute;
508 int err;
509
510 err = reg_read(isight, REG_MUTE, &mute);
511 if (err < 0)
512 return err;
513
514 value->value.integer.value[0] = !mute;
515
516 return 0;
517 }
518
isight_mute_put(struct snd_kcontrol * ctl,struct snd_ctl_elem_value * value)519 static int isight_mute_put(struct snd_kcontrol *ctl,
520 struct snd_ctl_elem_value *value)
521 {
522 struct isight *isight = ctl->private_data;
523
524 return reg_write(isight, REG_MUTE,
525 (__force __be32)!value->value.integer.value[0]);
526 }
527
isight_create_mixer(struct isight * isight)528 static int isight_create_mixer(struct isight *isight)
529 {
530 static const struct snd_kcontrol_new gain_control = {
531 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
532 .name = "Mic Capture Volume",
533 .access = SNDRV_CTL_ELEM_ACCESS_READWRITE |
534 SNDRV_CTL_ELEM_ACCESS_TLV_READ,
535 .info = isight_gain_info,
536 .get = isight_gain_get,
537 .put = isight_gain_put,
538 };
539 static const struct snd_kcontrol_new mute_control = {
540 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
541 .name = "Mic Capture Switch",
542 .info = snd_ctl_boolean_mono_info,
543 .get = isight_mute_get,
544 .put = isight_mute_put,
545 };
546 __be32 value;
547 struct snd_kcontrol *ctl;
548 int err;
549
550 err = reg_read(isight, REG_GAIN_RAW_START, &value);
551 if (err < 0)
552 return err;
553 isight->gain_min = be32_to_cpu(value);
554
555 err = reg_read(isight, REG_GAIN_RAW_END, &value);
556 if (err < 0)
557 return err;
558 isight->gain_max = be32_to_cpu(value);
559
560 isight->gain_tlv[SNDRV_CTL_TLVO_TYPE] = SNDRV_CTL_TLVT_DB_MINMAX;
561 isight->gain_tlv[SNDRV_CTL_TLVO_LEN] = 2 * sizeof(unsigned int);
562
563 err = reg_read(isight, REG_GAIN_DB_START, &value);
564 if (err < 0)
565 return err;
566 isight->gain_tlv[SNDRV_CTL_TLVO_DB_MINMAX_MIN] =
567 (s32)be32_to_cpu(value) * 100;
568
569 err = reg_read(isight, REG_GAIN_DB_END, &value);
570 if (err < 0)
571 return err;
572 isight->gain_tlv[SNDRV_CTL_TLVO_DB_MINMAX_MAX] =
573 (s32)be32_to_cpu(value) * 100;
574
575 ctl = snd_ctl_new1(&gain_control, isight);
576 if (ctl)
577 ctl->tlv.p = isight->gain_tlv;
578 err = snd_ctl_add(isight->card, ctl);
579 if (err < 0)
580 return err;
581
582 err = snd_ctl_add(isight->card, snd_ctl_new1(&mute_control, isight));
583 if (err < 0)
584 return err;
585
586 return 0;
587 }
588
isight_card_free(struct snd_card * card)589 static void isight_card_free(struct snd_card *card)
590 {
591 struct isight *isight = card->private_data;
592
593 fw_iso_resources_destroy(&isight->resources);
594 }
595
get_unit_base(struct fw_unit * unit)596 static u64 get_unit_base(struct fw_unit *unit)
597 {
598 struct fw_csr_iterator i;
599 int key, value;
600
601 fw_csr_iterator_init(&i, unit->directory);
602 while (fw_csr_iterator_next(&i, &key, &value))
603 if (key == CSR_OFFSET)
604 return CSR_REGISTER_BASE + value * 4;
605 return 0;
606 }
607
isight_probe(struct fw_unit * unit,const struct ieee1394_device_id * id)608 static int isight_probe(struct fw_unit *unit,
609 const struct ieee1394_device_id *id)
610 {
611 struct fw_device *fw_dev = fw_parent_device(unit);
612 struct snd_card *card;
613 struct isight *isight;
614 int err;
615
616 err = snd_card_new(&unit->device, -1, NULL, THIS_MODULE,
617 sizeof(*isight), &card);
618 if (err < 0)
619 return err;
620
621 isight = card->private_data;
622 isight->card = card;
623 mutex_init(&isight->mutex);
624 isight->unit = fw_unit_get(unit);
625 isight->device = fw_dev;
626 isight->audio_base = get_unit_base(unit);
627 if (!isight->audio_base) {
628 dev_err(&unit->device, "audio unit base not found\n");
629 err = -ENXIO;
630 goto error;
631 }
632 fw_iso_resources_init(&isight->resources, unit);
633
634 card->private_free = isight_card_free;
635
636 strscpy(card->driver, "iSight");
637 strscpy(card->shortname, "Apple iSight");
638 snprintf(card->longname, sizeof(card->longname),
639 "Apple iSight (GUID %08x%08x) at %s, S%d",
640 fw_dev->config_rom[3], fw_dev->config_rom[4],
641 dev_name(&unit->device), 100 << fw_dev->max_speed);
642 strscpy(card->mixername, "iSight");
643
644 err = isight_create_pcm(isight);
645 if (err < 0)
646 goto error;
647
648 err = isight_create_mixer(isight);
649 if (err < 0)
650 goto error;
651
652 err = snd_card_register(card);
653 if (err < 0)
654 goto error;
655
656 dev_set_drvdata(&unit->device, isight);
657
658 return 0;
659 error:
660 snd_card_free(card);
661
662 mutex_destroy(&isight->mutex);
663 fw_unit_put(isight->unit);
664
665 return err;
666 }
667
isight_bus_reset(struct fw_unit * unit)668 static void isight_bus_reset(struct fw_unit *unit)
669 {
670 struct isight *isight = dev_get_drvdata(&unit->device);
671
672 if (fw_iso_resources_update(&isight->resources) < 0) {
673 isight_pcm_abort(isight);
674
675 guard(mutex)(&isight->mutex);
676 isight_stop_streaming(isight);
677 }
678 }
679
isight_remove(struct fw_unit * unit)680 static void isight_remove(struct fw_unit *unit)
681 {
682 struct isight *isight = dev_get_drvdata(&unit->device);
683
684 isight_pcm_abort(isight);
685
686 snd_card_disconnect(isight->card);
687
688 scoped_guard(mutex, &isight->mutex) {
689 isight_stop_streaming(isight);
690 }
691
692 // Block till all of ALSA character devices are released.
693 snd_card_free(isight->card);
694
695 mutex_destroy(&isight->mutex);
696 fw_unit_put(isight->unit);
697 }
698
699 static const struct ieee1394_device_id isight_id_table[] = {
700 {
701 .match_flags = IEEE1394_MATCH_SPECIFIER_ID |
702 IEEE1394_MATCH_VERSION,
703 .specifier_id = OUI_APPLE,
704 .version = SW_ISIGHT_AUDIO,
705 },
706 { }
707 };
708 MODULE_DEVICE_TABLE(ieee1394, isight_id_table);
709
710 static struct fw_driver isight_driver = {
711 .driver = {
712 .owner = THIS_MODULE,
713 .name = KBUILD_MODNAME,
714 .bus = &fw_bus_type,
715 },
716 .probe = isight_probe,
717 .update = isight_bus_reset,
718 .remove = isight_remove,
719 .id_table = isight_id_table,
720 };
721
alsa_isight_init(void)722 static int __init alsa_isight_init(void)
723 {
724 return driver_register(&isight_driver.driver);
725 }
726
alsa_isight_exit(void)727 static void __exit alsa_isight_exit(void)
728 {
729 driver_unregister(&isight_driver.driver);
730 }
731
732 module_init(alsa_isight_init);
733 module_exit(alsa_isight_exit);
734