xref: /linux/sound/firewire/isight.c (revision d7dfb07d4dacfc3d8fa553fe76f055724e2c7210)
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/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");
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 	WRITE_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 (!READ_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 	if (READ_ONCE(isight->pcm_active))
135 		snd_pcm_stop_xrun(isight->pcm);
136 }
137 
138 static void isight_dropped_samples(struct isight *isight, unsigned int total)
139 {
140 	struct snd_pcm_runtime *runtime;
141 	u32 dropped;
142 	unsigned int count1;
143 
144 	if (!READ_ONCE(isight->pcm_running))
145 		return;
146 
147 	runtime = isight->pcm->runtime;
148 	dropped = total - isight->total_samples;
149 	if (dropped < runtime->buffer_size) {
150 		if (isight->buffer_pointer + dropped <= runtime->buffer_size) {
151 			memset(runtime->dma_area + isight->buffer_pointer * 4,
152 			       0, dropped * 4);
153 		} else {
154 			count1 = runtime->buffer_size - isight->buffer_pointer;
155 			memset(runtime->dma_area + isight->buffer_pointer * 4,
156 			       0, count1 * 4);
157 			memset(runtime->dma_area, 0, (dropped - count1) * 4);
158 		}
159 		isight_update_pointers(isight, dropped);
160 	} else {
161 		isight_pcm_abort(isight);
162 	}
163 }
164 
165 static void isight_packet(struct fw_iso_context *context, u32 cycle,
166 			  size_t header_length, void *header, void *data)
167 {
168 	struct isight *isight = data;
169 	const struct audio_payload *payload;
170 	unsigned int index, length, count, total;
171 	int err;
172 
173 	if (isight->packet_index < 0)
174 		return;
175 	index = isight->packet_index;
176 	payload = isight->buffer.packets[index].buffer;
177 	length = be32_to_cpup(header) >> 16;
178 
179 	if (likely(length >= 16 &&
180 		   payload->signature == cpu_to_be32(0x73676874/*"sght"*/))) {
181 		count = be32_to_cpu(payload->sample_count);
182 		if (likely(count <= (length - 16) / 4)) {
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 
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 
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 
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 
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 
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 
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 
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 
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 	mutex_lock(&isight->mutex);
331 	isight_stop_streaming(isight);
332 	mutex_unlock(&isight->mutex);
333 
334 	return 0;
335 }
336 
337 static int isight_start_streaming(struct isight *isight)
338 {
339 	unsigned int i;
340 	int err;
341 
342 	if (isight->context) {
343 		if (isight->packet_index < 0)
344 			isight_stop_streaming(isight);
345 		else
346 			return 0;
347 	}
348 
349 	err = reg_write(isight, REG_SAMPLE_RATE, cpu_to_be32(RATE_48000));
350 	if (err < 0)
351 		goto error;
352 
353 	err = isight_connect(isight);
354 	if (err < 0)
355 		goto error;
356 
357 	err = reg_write(isight, REG_AUDIO_ENABLE, cpu_to_be32(AUDIO_ENABLE));
358 	if (err < 0)
359 		goto err_resources;
360 
361 	isight->context = fw_iso_context_create(isight->device->card,
362 						FW_ISO_CONTEXT_RECEIVE,
363 						isight->resources.channel,
364 						isight->device->max_speed,
365 						4, isight_packet, isight);
366 	if (IS_ERR(isight->context)) {
367 		err = PTR_ERR(isight->context);
368 		isight->context = NULL;
369 		goto err_resources;
370 	}
371 
372 	for (i = 0; i < QUEUE_LENGTH; ++i) {
373 		err = fw_iso_context_queue(isight->context, &audio_packet,
374 					   &isight->buffer.iso_buffer,
375 					   isight->buffer.packets[i].offset);
376 		if (err < 0)
377 			goto err_context;
378 	}
379 
380 	isight->first_packet = true;
381 	isight->packet_index = 0;
382 
383 	err = fw_iso_context_start(isight->context, -1, 0,
384 				   FW_ISO_CONTEXT_MATCH_ALL_TAGS/*?*/);
385 	if (err < 0)
386 		goto err_context;
387 
388 	return 0;
389 
390 err_context:
391 	fw_iso_context_destroy(isight->context);
392 	isight->context = NULL;
393 err_resources:
394 	fw_iso_resources_free(&isight->resources);
395 	reg_write(isight, REG_AUDIO_ENABLE, 0);
396 error:
397 	return err;
398 }
399 
400 static int isight_prepare(struct snd_pcm_substream *substream)
401 {
402 	struct isight *isight = substream->private_data;
403 	int err;
404 
405 	isight->buffer_pointer = 0;
406 	isight->period_counter = 0;
407 
408 	mutex_lock(&isight->mutex);
409 	err = isight_start_streaming(isight);
410 	mutex_unlock(&isight->mutex);
411 
412 	return err;
413 }
414 
415 static int isight_trigger(struct snd_pcm_substream *substream, int cmd)
416 {
417 	struct isight *isight = substream->private_data;
418 
419 	switch (cmd) {
420 	case SNDRV_PCM_TRIGGER_START:
421 		WRITE_ONCE(isight->pcm_running, true);
422 		break;
423 	case SNDRV_PCM_TRIGGER_STOP:
424 		WRITE_ONCE(isight->pcm_running, false);
425 		break;
426 	default:
427 		return -EINVAL;
428 	}
429 	return 0;
430 }
431 
432 static snd_pcm_uframes_t isight_pointer(struct snd_pcm_substream *substream)
433 {
434 	struct isight *isight = substream->private_data;
435 
436 	return READ_ONCE(isight->buffer_pointer);
437 }
438 
439 static int isight_create_pcm(struct isight *isight)
440 {
441 	static const struct snd_pcm_ops ops = {
442 		.open      = isight_open,
443 		.close     = isight_close,
444 		.hw_params = isight_hw_params,
445 		.hw_free   = isight_hw_free,
446 		.prepare   = isight_prepare,
447 		.trigger   = isight_trigger,
448 		.pointer   = isight_pointer,
449 	};
450 	struct snd_pcm *pcm;
451 	int err;
452 
453 	err = snd_pcm_new(isight->card, "iSight", 0, 0, 1, &pcm);
454 	if (err < 0)
455 		return err;
456 	pcm->private_data = isight;
457 	pcm->nonatomic = true;
458 	strcpy(pcm->name, "iSight");
459 	isight->pcm = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
460 	isight->pcm->ops = &ops;
461 	snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_VMALLOC, NULL, 0, 0);
462 
463 	return 0;
464 }
465 
466 static int isight_gain_info(struct snd_kcontrol *ctl,
467 			    struct snd_ctl_elem_info *info)
468 {
469 	struct isight *isight = ctl->private_data;
470 
471 	info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
472 	info->count = 1;
473 	info->value.integer.min = isight->gain_min;
474 	info->value.integer.max = isight->gain_max;
475 
476 	return 0;
477 }
478 
479 static int isight_gain_get(struct snd_kcontrol *ctl,
480 			   struct snd_ctl_elem_value *value)
481 {
482 	struct isight *isight = ctl->private_data;
483 	__be32 gain;
484 	int err;
485 
486 	err = reg_read(isight, REG_GAIN, &gain);
487 	if (err < 0)
488 		return err;
489 
490 	value->value.integer.value[0] = (s32)be32_to_cpu(gain);
491 
492 	return 0;
493 }
494 
495 static int isight_gain_put(struct snd_kcontrol *ctl,
496 			   struct snd_ctl_elem_value *value)
497 {
498 	struct isight *isight = ctl->private_data;
499 
500 	if (value->value.integer.value[0] < isight->gain_min ||
501 	    value->value.integer.value[0] > isight->gain_max)
502 		return -EINVAL;
503 
504 	return reg_write(isight, REG_GAIN,
505 			 cpu_to_be32(value->value.integer.value[0]));
506 }
507 
508 static int isight_mute_get(struct snd_kcontrol *ctl,
509 			   struct snd_ctl_elem_value *value)
510 {
511 	struct isight *isight = ctl->private_data;
512 	__be32 mute;
513 	int err;
514 
515 	err = reg_read(isight, REG_MUTE, &mute);
516 	if (err < 0)
517 		return err;
518 
519 	value->value.integer.value[0] = !mute;
520 
521 	return 0;
522 }
523 
524 static int isight_mute_put(struct snd_kcontrol *ctl,
525 			   struct snd_ctl_elem_value *value)
526 {
527 	struct isight *isight = ctl->private_data;
528 
529 	return reg_write(isight, REG_MUTE,
530 			 (__force __be32)!value->value.integer.value[0]);
531 }
532 
533 static int isight_create_mixer(struct isight *isight)
534 {
535 	static const struct snd_kcontrol_new gain_control = {
536 		.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
537 		.name = "Mic Capture Volume",
538 		.access = SNDRV_CTL_ELEM_ACCESS_READWRITE |
539 			  SNDRV_CTL_ELEM_ACCESS_TLV_READ,
540 		.info = isight_gain_info,
541 		.get = isight_gain_get,
542 		.put = isight_gain_put,
543 	};
544 	static const struct snd_kcontrol_new mute_control = {
545 		.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
546 		.name = "Mic Capture Switch",
547 		.info = snd_ctl_boolean_mono_info,
548 		.get = isight_mute_get,
549 		.put = isight_mute_put,
550 	};
551 	__be32 value;
552 	struct snd_kcontrol *ctl;
553 	int err;
554 
555 	err = reg_read(isight, REG_GAIN_RAW_START, &value);
556 	if (err < 0)
557 		return err;
558 	isight->gain_min = be32_to_cpu(value);
559 
560 	err = reg_read(isight, REG_GAIN_RAW_END, &value);
561 	if (err < 0)
562 		return err;
563 	isight->gain_max = be32_to_cpu(value);
564 
565 	isight->gain_tlv[SNDRV_CTL_TLVO_TYPE] = SNDRV_CTL_TLVT_DB_MINMAX;
566 	isight->gain_tlv[SNDRV_CTL_TLVO_LEN] = 2 * sizeof(unsigned int);
567 
568 	err = reg_read(isight, REG_GAIN_DB_START, &value);
569 	if (err < 0)
570 		return err;
571 	isight->gain_tlv[SNDRV_CTL_TLVO_DB_MINMAX_MIN] =
572 						(s32)be32_to_cpu(value) * 100;
573 
574 	err = reg_read(isight, REG_GAIN_DB_END, &value);
575 	if (err < 0)
576 		return err;
577 	isight->gain_tlv[SNDRV_CTL_TLVO_DB_MINMAX_MAX] =
578 						(s32)be32_to_cpu(value) * 100;
579 
580 	ctl = snd_ctl_new1(&gain_control, isight);
581 	if (ctl)
582 		ctl->tlv.p = isight->gain_tlv;
583 	err = snd_ctl_add(isight->card, ctl);
584 	if (err < 0)
585 		return err;
586 
587 	err = snd_ctl_add(isight->card, snd_ctl_new1(&mute_control, isight));
588 	if (err < 0)
589 		return err;
590 
591 	return 0;
592 }
593 
594 static void isight_card_free(struct snd_card *card)
595 {
596 	struct isight *isight = card->private_data;
597 
598 	fw_iso_resources_destroy(&isight->resources);
599 }
600 
601 static u64 get_unit_base(struct fw_unit *unit)
602 {
603 	struct fw_csr_iterator i;
604 	int key, value;
605 
606 	fw_csr_iterator_init(&i, unit->directory);
607 	while (fw_csr_iterator_next(&i, &key, &value))
608 		if (key == CSR_OFFSET)
609 			return CSR_REGISTER_BASE + value * 4;
610 	return 0;
611 }
612 
613 static int isight_probe(struct fw_unit *unit,
614 			const struct ieee1394_device_id *id)
615 {
616 	struct fw_device *fw_dev = fw_parent_device(unit);
617 	struct snd_card *card;
618 	struct isight *isight;
619 	int err;
620 
621 	err = snd_card_new(&unit->device, -1, NULL, THIS_MODULE,
622 			   sizeof(*isight), &card);
623 	if (err < 0)
624 		return err;
625 
626 	isight = card->private_data;
627 	isight->card = card;
628 	mutex_init(&isight->mutex);
629 	isight->unit = fw_unit_get(unit);
630 	isight->device = fw_dev;
631 	isight->audio_base = get_unit_base(unit);
632 	if (!isight->audio_base) {
633 		dev_err(&unit->device, "audio unit base not found\n");
634 		err = -ENXIO;
635 		goto error;
636 	}
637 	fw_iso_resources_init(&isight->resources, unit);
638 
639 	card->private_free = isight_card_free;
640 
641 	strcpy(card->driver, "iSight");
642 	strcpy(card->shortname, "Apple iSight");
643 	snprintf(card->longname, sizeof(card->longname),
644 		 "Apple iSight (GUID %08x%08x) at %s, S%d",
645 		 fw_dev->config_rom[3], fw_dev->config_rom[4],
646 		 dev_name(&unit->device), 100 << fw_dev->max_speed);
647 	strcpy(card->mixername, "iSight");
648 
649 	err = isight_create_pcm(isight);
650 	if (err < 0)
651 		goto error;
652 
653 	err = isight_create_mixer(isight);
654 	if (err < 0)
655 		goto error;
656 
657 	err = snd_card_register(card);
658 	if (err < 0)
659 		goto error;
660 
661 	dev_set_drvdata(&unit->device, isight);
662 
663 	return 0;
664 error:
665 	snd_card_free(card);
666 
667 	mutex_destroy(&isight->mutex);
668 	fw_unit_put(isight->unit);
669 
670 	return err;
671 }
672 
673 static void isight_bus_reset(struct fw_unit *unit)
674 {
675 	struct isight *isight = dev_get_drvdata(&unit->device);
676 
677 	if (fw_iso_resources_update(&isight->resources) < 0) {
678 		isight_pcm_abort(isight);
679 
680 		mutex_lock(&isight->mutex);
681 		isight_stop_streaming(isight);
682 		mutex_unlock(&isight->mutex);
683 	}
684 }
685 
686 static void isight_remove(struct fw_unit *unit)
687 {
688 	struct isight *isight = dev_get_drvdata(&unit->device);
689 
690 	isight_pcm_abort(isight);
691 
692 	snd_card_disconnect(isight->card);
693 
694 	mutex_lock(&isight->mutex);
695 	isight_stop_streaming(isight);
696 	mutex_unlock(&isight->mutex);
697 
698 	// Block till all of ALSA character devices are released.
699 	snd_card_free(isight->card);
700 
701 	mutex_destroy(&isight->mutex);
702 	fw_unit_put(isight->unit);
703 }
704 
705 static const struct ieee1394_device_id isight_id_table[] = {
706 	{
707 		.match_flags  = IEEE1394_MATCH_SPECIFIER_ID |
708 				IEEE1394_MATCH_VERSION,
709 		.specifier_id = OUI_APPLE,
710 		.version      = SW_ISIGHT_AUDIO,
711 	},
712 	{ }
713 };
714 MODULE_DEVICE_TABLE(ieee1394, isight_id_table);
715 
716 static struct fw_driver isight_driver = {
717 	.driver   = {
718 		.owner	= THIS_MODULE,
719 		.name	= KBUILD_MODNAME,
720 		.bus	= &fw_bus_type,
721 	},
722 	.probe    = isight_probe,
723 	.update   = isight_bus_reset,
724 	.remove   = isight_remove,
725 	.id_table = isight_id_table,
726 };
727 
728 static int __init alsa_isight_init(void)
729 {
730 	return driver_register(&isight_driver.driver);
731 }
732 
733 static void __exit alsa_isight_exit(void)
734 {
735 	driver_unregister(&isight_driver.driver);
736 }
737 
738 module_init(alsa_isight_init);
739 module_exit(alsa_isight_exit);
740