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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[linux-btrfs-devel.git] / sound / firewire / isight.c
blob440030818db70c88c582d0047790baed074297c9
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);
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