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TOMOYO Linux Cross Reference
Linux/sound/firewire/isight.c

Version: ~ [ linux-5.1-rc5 ] ~ [ linux-5.0.7 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.34 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.111 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.168 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.178 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.138 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.65 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.39.4 ] ~ [ linux-2.6.38.8 ] ~ [ linux-2.6.37.6 ] ~ [ linux-2.6.36.4 ] ~ [ linux-2.6.35.14 ] ~ [ linux-2.6.34.15 ] ~ [ linux-2.6.33.20 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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         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         int err;
290 
291         err = snd_pcm_lib_alloc_vmalloc_buffer(substream,
292                                                params_buffer_bytes(hw_params));
293         if (err < 0)
294                 return err;
295 
296         WRITE_ONCE(isight->pcm_active, true);
297 
298         return 0;
299 }
300 
301 static int reg_read(struct isight *isight, int offset, __be32 *value)
302 {
303         return snd_fw_transaction(isight->unit, TCODE_READ_QUADLET_REQUEST,
304                                   isight->audio_base + offset, value, 4, 0);
305 }
306 
307 static int reg_write(struct isight *isight, int offset, __be32 value)
308 {
309         return snd_fw_transaction(isight->unit, TCODE_WRITE_QUADLET_REQUEST,
310                                   isight->audio_base + offset, &value, 4, 0);
311 }
312 
313 static void isight_stop_streaming(struct isight *isight)
314 {
315         __be32 value;
316 
317         if (!isight->context)
318                 return;
319 
320         fw_iso_context_stop(isight->context);
321         fw_iso_context_destroy(isight->context);
322         isight->context = NULL;
323         fw_iso_resources_free(&isight->resources);
324         value = 0;
325         snd_fw_transaction(isight->unit, TCODE_WRITE_QUADLET_REQUEST,
326                            isight->audio_base + REG_AUDIO_ENABLE,
327                            &value, 4, FW_QUIET);
328 }
329 
330 static int isight_hw_free(struct snd_pcm_substream *substream)
331 {
332         struct isight *isight = substream->private_data;
333 
334         WRITE_ONCE(isight->pcm_active, false);
335 
336         mutex_lock(&isight->mutex);
337         isight_stop_streaming(isight);
338         mutex_unlock(&isight->mutex);
339 
340         return snd_pcm_lib_free_vmalloc_buffer(substream);
341 }
342 
343 static int isight_start_streaming(struct isight *isight)
344 {
345         unsigned int i;
346         int err;
347 
348         if (isight->context) {
349                 if (isight->packet_index < 0)
350                         isight_stop_streaming(isight);
351                 else
352                         return 0;
353         }
354 
355         err = reg_write(isight, REG_SAMPLE_RATE, cpu_to_be32(RATE_48000));
356         if (err < 0)
357                 goto error;
358 
359         err = isight_connect(isight);
360         if (err < 0)
361                 goto error;
362 
363         err = reg_write(isight, REG_AUDIO_ENABLE, cpu_to_be32(AUDIO_ENABLE));
364         if (err < 0)
365                 goto err_resources;
366 
367         isight->context = fw_iso_context_create(isight->device->card,
368                                                 FW_ISO_CONTEXT_RECEIVE,
369                                                 isight->resources.channel,
370                                                 isight->device->max_speed,
371                                                 4, isight_packet, isight);
372         if (IS_ERR(isight->context)) {
373                 err = PTR_ERR(isight->context);
374                 isight->context = NULL;
375                 goto err_resources;
376         }
377 
378         for (i = 0; i < QUEUE_LENGTH; ++i) {
379                 err = fw_iso_context_queue(isight->context, &audio_packet,
380                                            &isight->buffer.iso_buffer,
381                                            isight->buffer.packets[i].offset);
382                 if (err < 0)
383                         goto err_context;
384         }
385 
386         isight->first_packet = true;
387         isight->packet_index = 0;
388 
389         err = fw_iso_context_start(isight->context, -1, 0,
390                                    FW_ISO_CONTEXT_MATCH_ALL_TAGS/*?*/);
391         if (err < 0)
392                 goto err_context;
393 
394         return 0;
395 
396 err_context:
397         fw_iso_context_destroy(isight->context);
398         isight->context = NULL;
399 err_resources:
400         fw_iso_resources_free(&isight->resources);
401         reg_write(isight, REG_AUDIO_ENABLE, 0);
402 error:
403         return err;
404 }
405 
406 static int isight_prepare(struct snd_pcm_substream *substream)
407 {
408         struct isight *isight = substream->private_data;
409         int err;
410 
411         isight->buffer_pointer = 0;
412         isight->period_counter = 0;
413 
414         mutex_lock(&isight->mutex);
415         err = isight_start_streaming(isight);
416         mutex_unlock(&isight->mutex);
417 
418         return err;
419 }
420 
421 static int isight_trigger(struct snd_pcm_substream *substream, int cmd)
422 {
423         struct isight *isight = substream->private_data;
424 
425         switch (cmd) {
426         case SNDRV_PCM_TRIGGER_START:
427                 WRITE_ONCE(isight->pcm_running, true);
428                 break;
429         case SNDRV_PCM_TRIGGER_STOP:
430                 WRITE_ONCE(isight->pcm_running, false);
431                 break;
432         default:
433                 return -EINVAL;
434         }
435         return 0;
436 }
437 
438 static snd_pcm_uframes_t isight_pointer(struct snd_pcm_substream *substream)
439 {
440         struct isight *isight = substream->private_data;
441 
442         return READ_ONCE(isight->buffer_pointer);
443 }
444 
445 static int isight_create_pcm(struct isight *isight)
446 {
447         static const struct snd_pcm_ops ops = {
448                 .open      = isight_open,
449                 .close     = isight_close,
450                 .ioctl     = snd_pcm_lib_ioctl,
451                 .hw_params = isight_hw_params,
452                 .hw_free   = isight_hw_free,
453                 .prepare   = isight_prepare,
454                 .trigger   = isight_trigger,
455                 .pointer   = isight_pointer,
456                 .page      = snd_pcm_lib_get_vmalloc_page,
457         };
458         struct snd_pcm *pcm;
459         int err;
460 
461         err = snd_pcm_new(isight->card, "iSight", 0, 0, 1, &pcm);
462         if (err < 0)
463                 return err;
464         pcm->private_data = isight;
465         strcpy(pcm->name, "iSight");
466         isight->pcm = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
467         isight->pcm->ops = &ops;
468 
469         return 0;
470 }
471 
472 static int isight_gain_info(struct snd_kcontrol *ctl,
473                             struct snd_ctl_elem_info *info)
474 {
475         struct isight *isight = ctl->private_data;
476 
477         info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
478         info->count = 1;
479         info->value.integer.min = isight->gain_min;
480         info->value.integer.max = isight->gain_max;
481 
482         return 0;
483 }
484 
485 static int isight_gain_get(struct snd_kcontrol *ctl,
486                            struct snd_ctl_elem_value *value)
487 {
488         struct isight *isight = ctl->private_data;
489         __be32 gain;
490         int err;
491 
492         err = reg_read(isight, REG_GAIN, &gain);
493         if (err < 0)
494                 return err;
495 
496         value->value.integer.value[0] = (s32)be32_to_cpu(gain);
497 
498         return 0;
499 }
500 
501 static int isight_gain_put(struct snd_kcontrol *ctl,
502                            struct snd_ctl_elem_value *value)
503 {
504         struct isight *isight = ctl->private_data;
505 
506         if (value->value.integer.value[0] < isight->gain_min ||
507             value->value.integer.value[0] > isight->gain_max)
508                 return -EINVAL;
509 
510         return reg_write(isight, REG_GAIN,
511                          cpu_to_be32(value->value.integer.value[0]));
512 }
513 
514 static int isight_mute_get(struct snd_kcontrol *ctl,
515                            struct snd_ctl_elem_value *value)
516 {
517         struct isight *isight = ctl->private_data;
518         __be32 mute;
519         int err;
520 
521         err = reg_read(isight, REG_MUTE, &mute);
522         if (err < 0)
523                 return err;
524 
525         value->value.integer.value[0] = !mute;
526 
527         return 0;
528 }
529 
530 static int isight_mute_put(struct snd_kcontrol *ctl,
531                            struct snd_ctl_elem_value *value)
532 {
533         struct isight *isight = ctl->private_data;
534 
535         return reg_write(isight, REG_MUTE,
536                          (__force __be32)!value->value.integer.value[0]);
537 }
538 
539 static int isight_create_mixer(struct isight *isight)
540 {
541         static const struct snd_kcontrol_new gain_control = {
542                 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
543                 .name = "Mic Capture Volume",
544                 .access = SNDRV_CTL_ELEM_ACCESS_READWRITE |
545                           SNDRV_CTL_ELEM_ACCESS_TLV_READ,
546                 .info = isight_gain_info,
547                 .get = isight_gain_get,
548                 .put = isight_gain_put,
549         };
550         static const struct snd_kcontrol_new mute_control = {
551                 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
552                 .name = "Mic Capture Switch",
553                 .info = snd_ctl_boolean_mono_info,
554                 .get = isight_mute_get,
555                 .put = isight_mute_put,
556         };
557         __be32 value;
558         struct snd_kcontrol *ctl;
559         int err;
560 
561         err = reg_read(isight, REG_GAIN_RAW_START, &value);
562         if (err < 0)
563                 return err;
564         isight->gain_min = be32_to_cpu(value);
565 
566         err = reg_read(isight, REG_GAIN_RAW_END, &value);
567         if (err < 0)
568                 return err;
569         isight->gain_max = be32_to_cpu(value);
570 
571         isight->gain_tlv[SNDRV_CTL_TLVO_TYPE] = SNDRV_CTL_TLVT_DB_MINMAX;
572         isight->gain_tlv[SNDRV_CTL_TLVO_LEN] = 2 * sizeof(unsigned int);
573 
574         err = reg_read(isight, REG_GAIN_DB_START, &value);
575         if (err < 0)
576                 return err;
577         isight->gain_tlv[SNDRV_CTL_TLVO_DB_MINMAX_MIN] =
578                                                 (s32)be32_to_cpu(value) * 100;
579 
580         err = reg_read(isight, REG_GAIN_DB_END, &value);
581         if (err < 0)
582                 return err;
583         isight->gain_tlv[SNDRV_CTL_TLVO_DB_MINMAX_MAX] =
584                                                 (s32)be32_to_cpu(value) * 100;
585 
586         ctl = snd_ctl_new1(&gain_control, isight);
587         if (ctl)
588                 ctl->tlv.p = isight->gain_tlv;
589         err = snd_ctl_add(isight->card, ctl);
590         if (err < 0)
591                 return err;
592 
593         err = snd_ctl_add(isight->card, snd_ctl_new1(&mute_control, isight));
594         if (err < 0)
595                 return err;
596 
597         return 0;
598 }
599 
600 static void isight_card_free(struct snd_card *card)
601 {
602         struct isight *isight = card->private_data;
603 
604         fw_iso_resources_destroy(&isight->resources);
605 }
606 
607 static u64 get_unit_base(struct fw_unit *unit)
608 {
609         struct fw_csr_iterator i;
610         int key, value;
611 
612         fw_csr_iterator_init(&i, unit->directory);
613         while (fw_csr_iterator_next(&i, &key, &value))
614                 if (key == CSR_OFFSET)
615                         return CSR_REGISTER_BASE + value * 4;
616         return 0;
617 }
618 
619 static int isight_probe(struct fw_unit *unit,
620                         const struct ieee1394_device_id *id)
621 {
622         struct fw_device *fw_dev = fw_parent_device(unit);
623         struct snd_card *card;
624         struct isight *isight;
625         int err;
626 
627         err = snd_card_new(&unit->device, -1, NULL, THIS_MODULE,
628                            sizeof(*isight), &card);
629         if (err < 0)
630                 return err;
631 
632         isight = card->private_data;
633         isight->card = card;
634         mutex_init(&isight->mutex);
635         isight->unit = fw_unit_get(unit);
636         isight->device = fw_dev;
637         isight->audio_base = get_unit_base(unit);
638         if (!isight->audio_base) {
639                 dev_err(&unit->device, "audio unit base not found\n");
640                 err = -ENXIO;
641                 goto error;
642         }
643         fw_iso_resources_init(&isight->resources, unit);
644 
645         card->private_free = isight_card_free;
646 
647         strcpy(card->driver, "iSight");
648         strcpy(card->shortname, "Apple iSight");
649         snprintf(card->longname, sizeof(card->longname),
650                  "Apple iSight (GUID %08x%08x) at %s, S%d",
651                  fw_dev->config_rom[3], fw_dev->config_rom[4],
652                  dev_name(&unit->device), 100 << fw_dev->max_speed);
653         strcpy(card->mixername, "iSight");
654 
655         err = isight_create_pcm(isight);
656         if (err < 0)
657                 goto error;
658 
659         err = isight_create_mixer(isight);
660         if (err < 0)
661                 goto error;
662 
663         err = snd_card_register(card);
664         if (err < 0)
665                 goto error;
666 
667         dev_set_drvdata(&unit->device, isight);
668 
669         return 0;
670 error:
671         snd_card_free(card);
672 
673         mutex_destroy(&isight->mutex);
674         fw_unit_put(isight->unit);
675 
676         return err;
677 }
678 
679 static void isight_bus_reset(struct fw_unit *unit)
680 {
681         struct isight *isight = dev_get_drvdata(&unit->device);
682 
683         if (fw_iso_resources_update(&isight->resources) < 0) {
684                 isight_pcm_abort(isight);
685 
686                 mutex_lock(&isight->mutex);
687                 isight_stop_streaming(isight);
688                 mutex_unlock(&isight->mutex);
689         }
690 }
691 
692 static void isight_remove(struct fw_unit *unit)
693 {
694         struct isight *isight = dev_get_drvdata(&unit->device);
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         // Block till all of ALSA character devices are released.
705         snd_card_free(isight->card);
706 
707         mutex_destroy(&isight->mutex);
708         fw_unit_put(isight->unit);
709 }
710 
711 static const struct ieee1394_device_id isight_id_table[] = {
712         {
713                 .match_flags  = IEEE1394_MATCH_SPECIFIER_ID |
714                                 IEEE1394_MATCH_VERSION,
715                 .specifier_id = OUI_APPLE,
716                 .version      = SW_ISIGHT_AUDIO,
717         },
718         { }
719 };
720 MODULE_DEVICE_TABLE(ieee1394, isight_id_table);
721 
722 static struct fw_driver isight_driver = {
723         .driver   = {
724                 .owner  = THIS_MODULE,
725                 .name   = KBUILD_MODNAME,
726                 .bus    = &fw_bus_type,
727         },
728         .probe    = isight_probe,
729         .update   = isight_bus_reset,
730         .remove   = isight_remove,
731         .id_table = isight_id_table,
732 };
733 
734 static int __init alsa_isight_init(void)
735 {
736         return driver_register(&isight_driver.driver);
737 }
738 
739 static void __exit alsa_isight_exit(void)
740 {
741         driver_unregister(&isight_driver.driver);
742 }
743 
744 module_init(alsa_isight_init);
745 module_exit(alsa_isight_exit);
746 

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