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Linux 3.8-rc7
[cris-mirror.git] / sound / firewire / isight.c
blobd428ffede4f33bfb885adc7368c3317bd3688dc7
1 /*
2 * Apple iSight audio driver
3 *
4 * Copyright (c) Clemens Ladisch <clemens@ladisch.de>
5 * Licensed under the terms of the GNU General Public License, version 2.
6 */
7
8 #include <asm/byteorder.h>
9 #include <linux/delay.h>
10 #include <linux/device.h>
11 #include <linux/firewire.h>
12 #include <linux/firewire-constants.h>
13 #include <linux/module.h>
14 #include <linux/mod_devicetable.h>
15 #include <linux/mutex.h>
16 #include <linux/string.h>
17 #include <sound/control.h>
18 #include <sound/core.h>
19 #include <sound/initval.h>
20 #include <sound/pcm.h>
21 #include <sound/tlv.h>
22 #include "lib.h"
23 #include "iso-resources.h"
24 #include "packets-buffer.h"
25
26 #define OUI_APPLE 0x000a27
27 #define MODEL_APPLE_ISIGHT 0x000008
28 #define SW_ISIGHT_AUDIO 0x000010
29
30 #define REG_AUDIO_ENABLE 0x000
31 #define AUDIO_ENABLE 0x80000000
32 #define REG_DEF_AUDIO_GAIN 0x204
33 #define REG_GAIN_RAW_START 0x210
34 #define REG_GAIN_RAW_END 0x214
35 #define REG_GAIN_DB_START 0x218
36 #define REG_GAIN_DB_END 0x21c
37 #define REG_SAMPLE_RATE_INQUIRY 0x280
38 #define REG_ISO_TX_CONFIG 0x300
39 #define SPEED_SHIFT 16
40 #define REG_SAMPLE_RATE 0x400
41 #define RATE_48000 0x80000000
42 #define REG_GAIN 0x500
43 #define REG_MUTE 0x504
44
45 #define MAX_FRAMES_PER_PACKET 475
46
47 #define QUEUE_LENGTH 20
48
49 struct isight {
50 struct snd_card *card;
51 struct fw_unit *unit;
52 struct fw_device *device;
53 u64 audio_base;
54 struct snd_pcm_substream *pcm;
55 struct mutex mutex;
56 struct iso_packets_buffer buffer;
57 struct fw_iso_resources resources;
58 struct fw_iso_context *context;
59 bool pcm_active;
60 bool pcm_running;
61 bool first_packet;
62 int packet_index;
63 u32 total_samples;
64 unsigned int buffer_pointer;
65 unsigned int period_counter;
66 s32 gain_min, gain_max;
67 unsigned int gain_tlv[4];
68 };
69
70 struct audio_payload {
71 __be32 sample_count;
72 __be32 signature;
73 __be32 sample_total;
74 __be32 reserved;
75 __be16 samples[2 * MAX_FRAMES_PER_PACKET];
76 };
77
78 MODULE_DESCRIPTION("iSight audio driver");
79 MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>");
80 MODULE_LICENSE("GPL v2");
81
82 static struct fw_iso_packet audio_packet = {
83 .payload_length = sizeof(struct audio_payload),
84 .interrupt = 1,
85 .header_length = 4,
86 };
87
88 static void isight_update_pointers(struct isight *isight, unsigned int count)
89 {
90 struct snd_pcm_runtime *runtime = isight->pcm->runtime;
91 unsigned int ptr;
92
93 smp_wmb(); /* update buffer data before buffer pointer */
94
95 ptr = isight->buffer_pointer;
96 ptr += count;
97 if (ptr >= runtime->buffer_size)
98 ptr -= runtime->buffer_size;
99 ACCESS_ONCE(isight->buffer_pointer) = ptr;
100
101 isight->period_counter += count;
102 if (isight->period_counter >= runtime->period_size) {
103 isight->period_counter -= runtime->period_size;
104 snd_pcm_period_elapsed(isight->pcm);
105 }
106 }
107
108 static void isight_samples(struct isight *isight,
109 const __be16 *samples, unsigned int count)
110 {
111 struct snd_pcm_runtime *runtime;
112 unsigned int count1;
113
114 if (!ACCESS_ONCE(isight->pcm_running))
115 return;
116
117 runtime = isight->pcm->runtime;
118 if (isight->buffer_pointer + count <= runtime->buffer_size) {
119 memcpy(runtime->dma_area + isight->buffer_pointer * 4,
120 samples, count * 4);
121 } else {
122 count1 = runtime->buffer_size - isight->buffer_pointer;
123 memcpy(runtime->dma_area + isight->buffer_pointer * 4,
124 samples, count1 * 4);
125 samples += count1 * 2;
126 memcpy(runtime->dma_area, samples, (count - count1) * 4);
127 }
128
129 isight_update_pointers(isight, count);
130 }
131
132 static void isight_pcm_abort(struct isight *isight)
133 {
134 unsigned long flags;
135
136 if (ACCESS_ONCE(isight->pcm_active)) {
137 snd_pcm_stream_lock_irqsave(isight->pcm, flags);
138 if (snd_pcm_running(isight->pcm))
139 snd_pcm_stop(isight->pcm, SNDRV_PCM_STATE_XRUN);
140 snd_pcm_stream_unlock_irqrestore(isight->pcm, flags);
141 }
142 }
143
144 static void isight_dropped_samples(struct isight *isight, unsigned int total)
145 {
146 struct snd_pcm_runtime *runtime;
147 u32 dropped;
148 unsigned int count1;
149
150 if (!ACCESS_ONCE(isight->pcm_running))
151 return;
152
153 runtime = isight->pcm->runtime;
154 dropped = total - isight->total_samples;
155 if (dropped < runtime->buffer_size) {
156 if (isight->buffer_pointer + dropped <= runtime->buffer_size) {
157 memset(runtime->dma_area + isight->buffer_pointer * 4,
158 0, dropped * 4);
159 } else {
160 count1 = runtime->buffer_size - isight->buffer_pointer;
161 memset(runtime->dma_area + isight->buffer_pointer * 4,
162 0, count1 * 4);
163 memset(runtime->dma_area, 0, (dropped - count1) * 4);
164 }
165 isight_update_pointers(isight, dropped);
166 } else {
167 isight_pcm_abort(isight);
168 }
169 }
170
171 static void isight_packet(struct fw_iso_context *context, u32 cycle,
172 size_t header_length, void *header, void *data)
173 {
174 struct isight *isight = data;
175 const struct audio_payload *payload;
176 unsigned int index, length, count, total;
177 int err;
178
179 if (isight->packet_index < 0)
180 return;
181 index = isight->packet_index;
182 payload = isight->buffer.packets[index].buffer;
183 length = be32_to_cpup(header) >> 16;
184
185 if (likely(length >= 16 &&
186 payload->signature == cpu_to_be32(0x73676874/*"sght"*/))) {
187 count = be32_to_cpu(payload->sample_count);
188 if (likely(count <= (length - 16) / 4)) {
189 total = be32_to_cpu(payload->sample_total);
190 if (unlikely(total != isight->total_samples)) {
191 if (!isight->first_packet)
192 isight_dropped_samples(isight, total);
193 isight->first_packet = false;
194 isight->total_samples = total;
195 }
196
197 isight_samples(isight, payload->samples, count);
198 isight->total_samples += count;
199 }
200 }
201
202 err = fw_iso_context_queue(isight->context, &audio_packet,
203 &isight->buffer.iso_buffer,
204 isight->buffer.packets[index].offset);
205 if (err < 0) {
206 dev_err(&isight->unit->device, "queueing error: %d\n", err);
207 isight_pcm_abort(isight);
208 isight->packet_index = -1;
209 return;
210 }
211 fw_iso_context_queue_flush(isight->context);
212
213 if (++index >= QUEUE_LENGTH)
214 index = 0;
215 isight->packet_index = index;
216 }
217
218 static int isight_connect(struct isight *isight)
219 {
220 int ch, err, rcode, errors = 0;
221 __be32 value;
222
223 retry_after_bus_reset:
224 ch = fw_iso_resources_allocate(&isight->resources,
225 sizeof(struct audio_payload),
226 isight->device->max_speed);
227 if (ch < 0) {
228 err = ch;
229 goto error;
230 }
231
232 value = cpu_to_be32(ch | (isight->device->max_speed << SPEED_SHIFT));
233 for (;;) {
234 rcode = fw_run_transaction(
235 isight->device->card,
236 TCODE_WRITE_QUADLET_REQUEST,
237 isight->device->node_id,
238 isight->resources.generation,
239 isight->device->max_speed,
240 isight->audio_base + REG_ISO_TX_CONFIG,
241 &value, 4);
242 if (rcode == RCODE_COMPLETE) {
243 return 0;
244 } else if (rcode == RCODE_GENERATION) {
245 fw_iso_resources_free(&isight->resources);
246 goto retry_after_bus_reset;
247 } else if (rcode_is_permanent_error(rcode) || ++errors >= 3) {
248 err = -EIO;
249 goto err_resources;
250 }
251 msleep(5);
252 }
253
254 err_resources:
255 fw_iso_resources_free(&isight->resources);
256 error:
257 return err;
258 }
259
260 static int isight_open(struct snd_pcm_substream *substream)
261 {
262 static const struct snd_pcm_hardware hardware = {
263 .info = SNDRV_PCM_INFO_MMAP |
264 SNDRV_PCM_INFO_MMAP_VALID |
265 SNDRV_PCM_INFO_BATCH |
266 SNDRV_PCM_INFO_INTERLEAVED |
267 SNDRV_PCM_INFO_BLOCK_TRANSFER,
268 .formats = SNDRV_PCM_FMTBIT_S16_BE,
269 .rates = SNDRV_PCM_RATE_48000,
270 .rate_min = 48000,
271 .rate_max = 48000,
272 .channels_min = 2,
273 .channels_max = 2,
274 .buffer_bytes_max = 4 * 1024 * 1024,
275 .period_bytes_min = MAX_FRAMES_PER_PACKET * 4,
276 .period_bytes_max = 1024 * 1024,
277 .periods_min = 2,
278 .periods_max = UINT_MAX,
279 };
280 struct isight *isight = substream->private_data;
281
282 substream->runtime->hw = hardware;
283
284 return iso_packets_buffer_init(&isight->buffer, isight->unit,
285 QUEUE_LENGTH,
286 sizeof(struct audio_payload),
287 DMA_FROM_DEVICE);
288 }
289
290 static int isight_close(struct snd_pcm_substream *substream)
291 {
292 struct isight *isight = substream->private_data;
293
294 iso_packets_buffer_destroy(&isight->buffer, isight->unit);
295
296 return 0;
297 }
298
299 static int isight_hw_params(struct snd_pcm_substream *substream,
300 struct snd_pcm_hw_params *hw_params)
301 {
302 struct isight *isight = substream->private_data;
303 int err;
304
305 err = snd_pcm_lib_alloc_vmalloc_buffer(substream,
306 params_buffer_bytes(hw_params));
307 if (err < 0)
308 return err;
309
310 ACCESS_ONCE(isight->pcm_active) = true;
311
312 return 0;
313 }
314
315 static int reg_read(struct isight *isight, int offset, __be32 *value)
316 {
317 return snd_fw_transaction(isight->unit, TCODE_READ_QUADLET_REQUEST,
318 isight->audio_base + offset, value, 4);
319 }
320
321 static int reg_write(struct isight *isight, int offset, __be32 value)
322 {
323 return snd_fw_transaction(isight->unit, TCODE_WRITE_QUADLET_REQUEST,
324 isight->audio_base + offset, &value, 4);
325 }
326
327 static void isight_stop_streaming(struct isight *isight)
328 {
329 if (!isight->context)
330 return;
331
332 fw_iso_context_stop(isight->context);
333 fw_iso_context_destroy(isight->context);
334 isight->context = NULL;
335 fw_iso_resources_free(&isight->resources);
336 reg_write(isight, REG_AUDIO_ENABLE, 0);
337 }
338
339 static int isight_hw_free(struct snd_pcm_substream *substream)
340 {
341 struct isight *isight = substream->private_data;
342
343 ACCESS_ONCE(isight->pcm_active) = false;
344
345 mutex_lock(&isight->mutex);
346 isight_stop_streaming(isight);
347 mutex_unlock(&isight->mutex);
348
349 return snd_pcm_lib_free_vmalloc_buffer(substream);
350 }
351
352 static int isight_start_streaming(struct isight *isight)
353 {
354 unsigned int i;
355 int err;
356
357 if (isight->context) {
358 if (isight->packet_index < 0)
359 isight_stop_streaming(isight);
360 else
361 return 0;
362 }
363
364 err = reg_write(isight, REG_SAMPLE_RATE, cpu_to_be32(RATE_48000));
365 if (err < 0)
366 goto error;
367
368 err = isight_connect(isight);
369 if (err < 0)
370 goto error;
371
372 err = reg_write(isight, REG_AUDIO_ENABLE, cpu_to_be32(AUDIO_ENABLE));
373 if (err < 0)
374 goto err_resources;
375
376 isight->context = fw_iso_context_create(isight->device->card,
377 FW_ISO_CONTEXT_RECEIVE,
378 isight->resources.channel,
379 isight->device->max_speed,
380 4, isight_packet, isight);
381 if (IS_ERR(isight->context)) {
382 err = PTR_ERR(isight->context);
383 isight->context = NULL;
384 goto err_resources;
385 }
386
387 for (i = 0; i < QUEUE_LENGTH; ++i) {
388 err = fw_iso_context_queue(isight->context, &audio_packet,
389 &isight->buffer.iso_buffer,
390 isight->buffer.packets[i].offset);
391 if (err < 0)
392 goto err_context;
393 }
394
395 isight->first_packet = true;
396 isight->packet_index = 0;
397
398 err = fw_iso_context_start(isight->context, -1, 0,
399 FW_ISO_CONTEXT_MATCH_ALL_TAGS/*?*/);
400 if (err < 0)
401 goto err_context;
402
403 return 0;
404
405 err_context:
406 fw_iso_context_destroy(isight->context);
407 isight->context = NULL;
408 err_resources:
409 fw_iso_resources_free(&isight->resources);
410 reg_write(isight, REG_AUDIO_ENABLE, 0);
411 error:
412 return err;
413 }
414
415 static int isight_prepare(struct snd_pcm_substream *substream)
416 {
417 struct isight *isight = substream->private_data;
418 int err;
419
420 isight->buffer_pointer = 0;
421 isight->period_counter = 0;
422
423 mutex_lock(&isight->mutex);
424 err = isight_start_streaming(isight);
425 mutex_unlock(&isight->mutex);
426
427 return err;
428 }
429
430 static int isight_trigger(struct snd_pcm_substream *substream, int cmd)
431 {
432 struct isight *isight = substream->private_data;
433
434 switch (cmd) {
435 case SNDRV_PCM_TRIGGER_START:
436 ACCESS_ONCE(isight->pcm_running) = true;
437 break;
438 case SNDRV_PCM_TRIGGER_STOP:
439 ACCESS_ONCE(isight->pcm_running) = false;
440 break;
441 default:
442 return -EINVAL;
443 }
444 return 0;
445 }
446
447 static snd_pcm_uframes_t isight_pointer(struct snd_pcm_substream *substream)
448 {
449 struct isight *isight = substream->private_data;
450
451 return ACCESS_ONCE(isight->buffer_pointer);
452 }
453
454 static int isight_create_pcm(struct isight *isight)
455 {
456 static struct snd_pcm_ops ops = {
457 .open = isight_open,
458 .close = isight_close,
459 .ioctl = snd_pcm_lib_ioctl,
460 .hw_params = isight_hw_params,
461 .hw_free = isight_hw_free,
462 .prepare = isight_prepare,
463 .trigger = isight_trigger,
464 .pointer = isight_pointer,
465 .page = snd_pcm_lib_get_vmalloc_page,
466 .mmap = snd_pcm_lib_mmap_vmalloc,
467 };
468 struct snd_pcm *pcm;
469 int err;
470
471 err = snd_pcm_new(isight->card, "iSight", 0, 0, 1, &pcm);
472 if (err < 0)
473 return err;
474 pcm->private_data = isight;
475 strcpy(pcm->name, "iSight");
476 isight->pcm = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
477 isight->pcm->ops = &ops;
478
479 return 0;
480 }
481
482 static int isight_gain_info(struct snd_kcontrol *ctl,
483 struct snd_ctl_elem_info *info)
484 {
485 struct isight *isight = ctl->private_data;
486
487 info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
488 info->count = 1;
489 info->value.integer.min = isight->gain_min;
490 info->value.integer.max = isight->gain_max;
491
492 return 0;
493 }
494
495 static int isight_gain_get(struct snd_kcontrol *ctl,
496 struct snd_ctl_elem_value *value)
497 {
498 struct isight *isight = ctl->private_data;
499 __be32 gain;
500 int err;
501
502 err = reg_read(isight, REG_GAIN, &gain);
503 if (err < 0)
504 return err;
505
506 value->value.integer.value[0] = (s32)be32_to_cpu(gain);
507
508 return 0;
509 }
510
511 static int isight_gain_put(struct snd_kcontrol *ctl,
512 struct snd_ctl_elem_value *value)
513 {
514 struct isight *isight = ctl->private_data;
515
516 if (value->value.integer.value[0] < isight->gain_min ||
517 value->value.integer.value[0] > isight->gain_max)
518 return -EINVAL;
519
520 return reg_write(isight, REG_GAIN,
521 cpu_to_be32(value->value.integer.value[0]));
522 }
523
524 static int isight_mute_get(struct snd_kcontrol *ctl,
525 struct snd_ctl_elem_value *value)
526 {
527 struct isight *isight = ctl->private_data;
528 __be32 mute;
529 int err;
530
531 err = reg_read(isight, REG_MUTE, &mute);
532 if (err < 0)
533 return err;
534
535 value->value.integer.value[0] = !mute;
536
537 return 0;
538 }
539
540 static int isight_mute_put(struct snd_kcontrol *ctl,
541 struct snd_ctl_elem_value *value)
542 {
543 struct isight *isight = ctl->private_data;
544
545 return reg_write(isight, REG_MUTE,
546 (__force __be32)!value->value.integer.value[0]);
547 }
548
549 static int isight_create_mixer(struct isight *isight)
550 {
551 static const struct snd_kcontrol_new gain_control = {
552 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
553 .name = "Mic Capture Volume",
554 .access = SNDRV_CTL_ELEM_ACCESS_READWRITE |
555 SNDRV_CTL_ELEM_ACCESS_TLV_READ,
556 .info = isight_gain_info,
557 .get = isight_gain_get,
558 .put = isight_gain_put,
559 };
560 static const struct snd_kcontrol_new mute_control = {
561 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
562 .name = "Mic Capture Switch",
563 .info = snd_ctl_boolean_mono_info,
564 .get = isight_mute_get,
565 .put = isight_mute_put,
566 };
567 __be32 value;
568 struct snd_kcontrol *ctl;
569 int err;
570
571 err = reg_read(isight, REG_GAIN_RAW_START, &value);
572 if (err < 0)
573 return err;
574 isight->gain_min = be32_to_cpu(value);
575
576 err = reg_read(isight, REG_GAIN_RAW_END, &value);
577 if (err < 0)
578 return err;
579 isight->gain_max = be32_to_cpu(value);
580
581 isight->gain_tlv[0] = SNDRV_CTL_TLVT_DB_MINMAX;
582 isight->gain_tlv[1] = 2 * sizeof(unsigned int);
583
584 err = reg_read(isight, REG_GAIN_DB_START, &value);
585 if (err < 0)
586 return err;
587 isight->gain_tlv[2] = (s32)be32_to_cpu(value) * 100;
588
589 err = reg_read(isight, REG_GAIN_DB_END, &value);
590 if (err < 0)
591 return err;
592 isight->gain_tlv[3] = (s32)be32_to_cpu(value) * 100;
593
594 ctl = snd_ctl_new1(&gain_control, isight);
595 if (ctl)
596 ctl->tlv.p = isight->gain_tlv;
597 err = snd_ctl_add(isight->card, ctl);
598 if (err < 0)
599 return err;
600
601 err = snd_ctl_add(isight->card, snd_ctl_new1(&mute_control, isight));
602 if (err < 0)
603 return err;
604
605 return 0;
606 }
607
608 static void isight_card_free(struct snd_card *card)
609 {
610 struct isight *isight = card->private_data;
611
612 fw_iso_resources_destroy(&isight->resources);
613 fw_unit_put(isight->unit);
614 mutex_destroy(&isight->mutex);
615 }
616
617 static u64 get_unit_base(struct fw_unit *unit)
618 {
619 struct fw_csr_iterator i;
620 int key, value;
621
622 fw_csr_iterator_init(&i, unit->directory);
623 while (fw_csr_iterator_next(&i, &key, &value))
624 if (key == CSR_OFFSET)
625 return CSR_REGISTER_BASE + value * 4;
626 return 0;
627 }
628
629 static int isight_probe(struct device *unit_dev)
630 {
631 struct fw_unit *unit = fw_unit(unit_dev);
632 struct fw_device *fw_dev = fw_parent_device(unit);
633 struct snd_card *card;
634 struct isight *isight;
635 int err;
636
637 err = snd_card_create(-1, NULL, THIS_MODULE, sizeof(*isight), &card);
638 if (err < 0)
639 return err;
640 snd_card_set_dev(card, unit_dev);
641
642 isight = card->private_data;
643 isight->card = card;
644 mutex_init(&isight->mutex);
645 isight->unit = fw_unit_get(unit);
646 isight->device = fw_dev;
647 isight->audio_base = get_unit_base(unit);
648 if (!isight->audio_base) {
649 dev_err(&unit->device, "audio unit base not found\n");
650 err = -ENXIO;
651 goto err_unit;
652 }
653 fw_iso_resources_init(&isight->resources, unit);
654
655 card->private_free = isight_card_free;
656
657 strcpy(card->driver, "iSight");
658 strcpy(card->shortname, "Apple iSight");
659 snprintf(card->longname, sizeof(card->longname),
660 "Apple iSight (GUID %08x%08x) at %s, S%d",
661 fw_dev->config_rom[3], fw_dev->config_rom[4],
662 dev_name(&unit->device), 100 << fw_dev->max_speed);
663 strcpy(card->mixername, "iSight");
664
665 err = isight_create_pcm(isight);
666 if (err < 0)
667 goto error;
668
669 err = isight_create_mixer(isight);
670 if (err < 0)
671 goto error;
672
673 err = snd_card_register(card);
674 if (err < 0)
675 goto error;
676
677 dev_set_drvdata(unit_dev, isight);
678
679 return 0;
680
681 err_unit:
682 fw_unit_put(isight->unit);
683 mutex_destroy(&isight->mutex);
684 error:
685 snd_card_free(card);
686 return err;
687 }
688
689 static int isight_remove(struct device *dev)
690 {
691 struct isight *isight = dev_get_drvdata(dev);
692
693 isight_pcm_abort(isight);
694
695 snd_card_disconnect(isight->card);
696
697 mutex_lock(&isight->mutex);
698 isight_stop_streaming(isight);
699 mutex_unlock(&isight->mutex);
700
701 snd_card_free_when_closed(isight->card);
702
703 return 0;
704 }
705
706 static void isight_bus_reset(struct fw_unit *unit)
707 {
708 struct isight *isight = dev_get_drvdata(&unit->device);
709
710 if (fw_iso_resources_update(&isight->resources) < 0) {
711 isight_pcm_abort(isight);
712
713 mutex_lock(&isight->mutex);
714 isight_stop_streaming(isight);
715 mutex_unlock(&isight->mutex);
716 }
717 }
718
719 static const struct ieee1394_device_id isight_id_table[] = {
720 {
721 .match_flags = IEEE1394_MATCH_SPECIFIER_ID |
722 IEEE1394_MATCH_VERSION,
723 .specifier_id = OUI_APPLE,
724 .version = SW_ISIGHT_AUDIO,
725 },
726 { }
727 };
728 MODULE_DEVICE_TABLE(ieee1394, isight_id_table);
729
730 static struct fw_driver isight_driver = {
731 .driver = {
732 .owner = THIS_MODULE,
733 .name = KBUILD_MODNAME,
734 .bus = &fw_bus_type,
735 .probe = isight_probe,
736 .remove = isight_remove,
737 },
738 .update = isight_bus_reset,
739 .id_table = isight_id_table,
740 };
741
742 static int __init alsa_isight_init(void)
743 {
744 return driver_register(&isight_driver.driver);
745 }
746
747 static void __exit alsa_isight_exit(void)
748 {
749 driver_unregister(&isight_driver.driver);
750 }
751
752 module_init(alsa_isight_init);
753 module_exit(alsa_isight_exit);
CRIS linux kernel tree