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23#include <linux/kernel.h>
24#include <linux/usb.h>
25#include <linux/init.h>
26#include <linux/sound.h>
27#include <linux/spinlock.h>
28#include <linux/soundcard.h>
29#include <linux/slab.h>
30#include <linux/vmalloc.h>
31#include <linux/proc_fs.h>
32#include <linux/module.h>
33#include <sound/core.h>
34#include <sound/pcm.h>
35#include <sound/pcm_params.h>
36#include <sound/info.h>
37#include <sound/initval.h>
38#include <sound/control.h>
39#include <media/v4l2-common.h>
40#include "cx231xx.h"
41
42static int debug;
43module_param(debug, int, 0644);
44MODULE_PARM_DESC(debug, "activates debug info");
45
46#define dprintk(fmt, arg...) do { \
47 if (debug) \
48 printk(KERN_INFO "cx231xx-audio %s: " fmt, \
49 __func__, ##arg); \
50 } while (0)
51
52static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
53
54static int cx231xx_isoc_audio_deinit(struct cx231xx *dev)
55{
56 int i;
57
58 dprintk("Stopping isoc\n");
59
60 for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
61 if (dev->adev.urb[i]) {
62 if (!irqs_disabled())
63 usb_kill_urb(dev->adev.urb[i]);
64 else
65 usb_unlink_urb(dev->adev.urb[i]);
66
67 usb_free_urb(dev->adev.urb[i]);
68 dev->adev.urb[i] = NULL;
69
70 kfree(dev->adev.transfer_buffer[i]);
71 dev->adev.transfer_buffer[i] = NULL;
72 }
73 }
74
75 return 0;
76}
77
78static int cx231xx_bulk_audio_deinit(struct cx231xx *dev)
79{
80 int i;
81
82 dprintk("Stopping bulk\n");
83
84 for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
85 if (dev->adev.urb[i]) {
86 if (!irqs_disabled())
87 usb_kill_urb(dev->adev.urb[i]);
88 else
89 usb_unlink_urb(dev->adev.urb[i]);
90
91 usb_free_urb(dev->adev.urb[i]);
92 dev->adev.urb[i] = NULL;
93
94 kfree(dev->adev.transfer_buffer[i]);
95 dev->adev.transfer_buffer[i] = NULL;
96 }
97 }
98
99 return 0;
100}
101
102static void cx231xx_audio_isocirq(struct urb *urb)
103{
104 struct cx231xx *dev = urb->context;
105 int i;
106 unsigned int oldptr;
107 int period_elapsed = 0;
108 int status;
109 unsigned char *cp;
110 unsigned int stride;
111 struct snd_pcm_substream *substream;
112 struct snd_pcm_runtime *runtime;
113
114 if (dev->state & DEV_DISCONNECTED)
115 return;
116
117 switch (urb->status) {
118 case 0:
119 case -ETIMEDOUT:
120 break;
121 case -ECONNRESET:
122 case -ENOENT:
123 case -ESHUTDOWN:
124 return;
125 default:
126 dprintk("urb completition error %d.\n", urb->status);
127 break;
128 }
129
130 if (atomic_read(&dev->stream_started) == 0)
131 return;
132
133 if (dev->adev.capture_pcm_substream) {
134 substream = dev->adev.capture_pcm_substream;
135 runtime = substream->runtime;
136 stride = runtime->frame_bits >> 3;
137
138 for (i = 0; i < urb->number_of_packets; i++) {
139 int length = urb->iso_frame_desc[i].actual_length /
140 stride;
141 cp = (unsigned char *)urb->transfer_buffer +
142 urb->iso_frame_desc[i].offset;
143
144 if (!length)
145 continue;
146
147 oldptr = dev->adev.hwptr_done_capture;
148 if (oldptr + length >= runtime->buffer_size) {
149 unsigned int cnt;
150
151 cnt = runtime->buffer_size - oldptr;
152 memcpy(runtime->dma_area + oldptr * stride, cp,
153 cnt * stride);
154 memcpy(runtime->dma_area, cp + cnt * stride,
155 length * stride - cnt * stride);
156 } else {
157 memcpy(runtime->dma_area + oldptr * stride, cp,
158 length * stride);
159 }
160
161 snd_pcm_stream_lock(substream);
162
163 dev->adev.hwptr_done_capture += length;
164 if (dev->adev.hwptr_done_capture >=
165 runtime->buffer_size)
166 dev->adev.hwptr_done_capture -=
167 runtime->buffer_size;
168
169 dev->adev.capture_transfer_done += length;
170 if (dev->adev.capture_transfer_done >=
171 runtime->period_size) {
172 dev->adev.capture_transfer_done -=
173 runtime->period_size;
174 period_elapsed = 1;
175 }
176 snd_pcm_stream_unlock(substream);
177 }
178 if (period_elapsed)
179 snd_pcm_period_elapsed(substream);
180 }
181 urb->status = 0;
182
183 status = usb_submit_urb(urb, GFP_ATOMIC);
184 if (status < 0) {
185 cx231xx_errdev("resubmit of audio urb failed (error=%i)\n",
186 status);
187 }
188 return;
189}
190
191static void cx231xx_audio_bulkirq(struct urb *urb)
192{
193 struct cx231xx *dev = urb->context;
194 unsigned int oldptr;
195 int period_elapsed = 0;
196 int status;
197 unsigned char *cp;
198 unsigned int stride;
199 struct snd_pcm_substream *substream;
200 struct snd_pcm_runtime *runtime;
201
202 if (dev->state & DEV_DISCONNECTED)
203 return;
204
205 switch (urb->status) {
206 case 0:
207 case -ETIMEDOUT:
208 break;
209 case -ECONNRESET:
210 case -ENOENT:
211 case -ESHUTDOWN:
212 return;
213 default:
214 dprintk("urb completition error %d.\n", urb->status);
215 break;
216 }
217
218 if (atomic_read(&dev->stream_started) == 0)
219 return;
220
221 if (dev->adev.capture_pcm_substream) {
222 substream = dev->adev.capture_pcm_substream;
223 runtime = substream->runtime;
224 stride = runtime->frame_bits >> 3;
225
226 if (1) {
227 int length = urb->actual_length /
228 stride;
229 cp = (unsigned char *)urb->transfer_buffer;
230
231 oldptr = dev->adev.hwptr_done_capture;
232 if (oldptr + length >= runtime->buffer_size) {
233 unsigned int cnt;
234
235 cnt = runtime->buffer_size - oldptr;
236 memcpy(runtime->dma_area + oldptr * stride, cp,
237 cnt * stride);
238 memcpy(runtime->dma_area, cp + cnt * stride,
239 length * stride - cnt * stride);
240 } else {
241 memcpy(runtime->dma_area + oldptr * stride, cp,
242 length * stride);
243 }
244
245 snd_pcm_stream_lock(substream);
246
247 dev->adev.hwptr_done_capture += length;
248 if (dev->adev.hwptr_done_capture >=
249 runtime->buffer_size)
250 dev->adev.hwptr_done_capture -=
251 runtime->buffer_size;
252
253 dev->adev.capture_transfer_done += length;
254 if (dev->adev.capture_transfer_done >=
255 runtime->period_size) {
256 dev->adev.capture_transfer_done -=
257 runtime->period_size;
258 period_elapsed = 1;
259 }
260 snd_pcm_stream_unlock(substream);
261 }
262 if (period_elapsed)
263 snd_pcm_period_elapsed(substream);
264 }
265 urb->status = 0;
266
267 status = usb_submit_urb(urb, GFP_ATOMIC);
268 if (status < 0) {
269 cx231xx_errdev("resubmit of audio urb failed (error=%i)\n",
270 status);
271 }
272 return;
273}
274
275static int cx231xx_init_audio_isoc(struct cx231xx *dev)
276{
277 int i, errCode;
278 int sb_size;
279
280 cx231xx_info("%s: Starting ISO AUDIO transfers\n", __func__);
281
282 if (dev->state & DEV_DISCONNECTED)
283 return -ENODEV;
284
285 sb_size = CX231XX_ISO_NUM_AUDIO_PACKETS * dev->adev.max_pkt_size;
286
287 for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
288 struct urb *urb;
289 int j, k;
290
291 dev->adev.transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC);
292 if (!dev->adev.transfer_buffer[i])
293 return -ENOMEM;
294
295 memset(dev->adev.transfer_buffer[i], 0x80, sb_size);
296 urb = usb_alloc_urb(CX231XX_ISO_NUM_AUDIO_PACKETS, GFP_ATOMIC);
297 if (!urb) {
298 cx231xx_errdev("usb_alloc_urb failed!\n");
299 for (j = 0; j < i; j++) {
300 usb_free_urb(dev->adev.urb[j]);
301 kfree(dev->adev.transfer_buffer[j]);
302 }
303 return -ENOMEM;
304 }
305
306 urb->dev = dev->udev;
307 urb->context = dev;
308 urb->pipe = usb_rcvisocpipe(dev->udev,
309 dev->adev.end_point_addr);
310 urb->transfer_flags = URB_ISO_ASAP;
311 urb->transfer_buffer = dev->adev.transfer_buffer[i];
312 urb->interval = 1;
313 urb->complete = cx231xx_audio_isocirq;
314 urb->number_of_packets = CX231XX_ISO_NUM_AUDIO_PACKETS;
315 urb->transfer_buffer_length = sb_size;
316
317 for (j = k = 0; j < CX231XX_ISO_NUM_AUDIO_PACKETS;
318 j++, k += dev->adev.max_pkt_size) {
319 urb->iso_frame_desc[j].offset = k;
320 urb->iso_frame_desc[j].length = dev->adev.max_pkt_size;
321 }
322 dev->adev.urb[i] = urb;
323 }
324
325 for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
326 errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC);
327 if (errCode < 0) {
328 cx231xx_isoc_audio_deinit(dev);
329 return errCode;
330 }
331 }
332
333 return errCode;
334}
335
336static int cx231xx_init_audio_bulk(struct cx231xx *dev)
337{
338 int i, errCode;
339 int sb_size;
340
341 cx231xx_info("%s: Starting BULK AUDIO transfers\n", __func__);
342
343 if (dev->state & DEV_DISCONNECTED)
344 return -ENODEV;
345
346 sb_size = CX231XX_NUM_AUDIO_PACKETS * dev->adev.max_pkt_size;
347
348 for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
349 struct urb *urb;
350 int j;
351
352 dev->adev.transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC);
353 if (!dev->adev.transfer_buffer[i])
354 return -ENOMEM;
355
356 memset(dev->adev.transfer_buffer[i], 0x80, sb_size);
357 urb = usb_alloc_urb(CX231XX_NUM_AUDIO_PACKETS, GFP_ATOMIC);
358 if (!urb) {
359 cx231xx_errdev("usb_alloc_urb failed!\n");
360 for (j = 0; j < i; j++) {
361 usb_free_urb(dev->adev.urb[j]);
362 kfree(dev->adev.transfer_buffer[j]);
363 }
364 return -ENOMEM;
365 }
366
367 urb->dev = dev->udev;
368 urb->context = dev;
369 urb->pipe = usb_rcvbulkpipe(dev->udev,
370 dev->adev.end_point_addr);
371 urb->transfer_flags = 0;
372 urb->transfer_buffer = dev->adev.transfer_buffer[i];
373 urb->complete = cx231xx_audio_bulkirq;
374 urb->transfer_buffer_length = sb_size;
375
376 dev->adev.urb[i] = urb;
377
378 }
379
380 for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
381 errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC);
382 if (errCode < 0) {
383 cx231xx_bulk_audio_deinit(dev);
384 return errCode;
385 }
386 }
387
388 return errCode;
389}
390
391static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
392 size_t size)
393{
394 struct snd_pcm_runtime *runtime = subs->runtime;
395
396 dprintk("Allocating vbuffer\n");
397 if (runtime->dma_area) {
398 if (runtime->dma_bytes > size)
399 return 0;
400
401 vfree(runtime->dma_area);
402 }
403 runtime->dma_area = vmalloc(size);
404 if (!runtime->dma_area)
405 return -ENOMEM;
406
407 runtime->dma_bytes = size;
408
409 return 0;
410}
411
412static struct snd_pcm_hardware snd_cx231xx_hw_capture = {
413 .info = SNDRV_PCM_INFO_BLOCK_TRANSFER |
414 SNDRV_PCM_INFO_MMAP |
415 SNDRV_PCM_INFO_INTERLEAVED |
416 SNDRV_PCM_INFO_MMAP_VALID,
417
418 .formats = SNDRV_PCM_FMTBIT_S16_LE,
419
420 .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_KNOT,
421
422 .rate_min = 48000,
423 .rate_max = 48000,
424 .channels_min = 2,
425 .channels_max = 2,
426 .buffer_bytes_max = 62720 * 8,
427 .period_bytes_min = 64,
428 .period_bytes_max = 12544,
429 .periods_min = 2,
430 .periods_max = 98,
431};
432
433static int snd_cx231xx_capture_open(struct snd_pcm_substream *substream)
434{
435 struct cx231xx *dev = snd_pcm_substream_chip(substream);
436 struct snd_pcm_runtime *runtime = substream->runtime;
437 int ret = 0;
438
439 dprintk("opening device and trying to acquire exclusive lock\n");
440
441 if (!dev) {
442 cx231xx_errdev("BUG: cx231xx can't find device struct."
443 " Can't proceed with open\n");
444 return -ENODEV;
445 }
446
447 if (dev->state & DEV_DISCONNECTED) {
448 cx231xx_errdev("Can't open. the device was removed.\n");
449 return -ENODEV;
450 }
451
452
453 dev->mute = 0;
454
455
456
457 mutex_lock(&dev->lock);
458 if (dev->USE_ISO)
459 ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 1);
460 else
461 ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 0);
462 mutex_unlock(&dev->lock);
463 if (ret < 0) {
464 cx231xx_errdev("failed to set alternate setting !\n");
465
466 return ret;
467 }
468
469 runtime->hw = snd_cx231xx_hw_capture;
470
471 mutex_lock(&dev->lock);
472
473 ret = cx231xx_capture_start(dev, 1, Audio);
474
475 dev->adev.users++;
476 mutex_unlock(&dev->lock);
477
478 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
479 dev->adev.capture_pcm_substream = substream;
480 runtime->private_data = dev;
481
482 return 0;
483}
484
485static int snd_cx231xx_pcm_close(struct snd_pcm_substream *substream)
486{
487 int ret;
488 struct cx231xx *dev = snd_pcm_substream_chip(substream);
489
490 dprintk("closing device\n");
491
492
493 mutex_lock(&dev->lock);
494 ret = cx231xx_capture_start(dev, 0, Audio);
495
496
497
498 ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 0);
499 if (ret < 0) {
500 cx231xx_errdev("failed to set alternate setting !\n");
501
502 mutex_unlock(&dev->lock);
503 return ret;
504 }
505
506 dev->mute = 1;
507 dev->adev.users--;
508 mutex_unlock(&dev->lock);
509
510 if (dev->adev.users == 0 && dev->adev.shutdown == 1) {
511 dprintk("audio users: %d\n", dev->adev.users);
512 dprintk("disabling audio stream!\n");
513 dev->adev.shutdown = 0;
514 dprintk("released lock\n");
515 if (atomic_read(&dev->stream_started) > 0) {
516 atomic_set(&dev->stream_started, 0);
517 schedule_work(&dev->wq_trigger);
518 }
519 }
520 return 0;
521}
522
523static int snd_cx231xx_hw_capture_params(struct snd_pcm_substream *substream,
524 struct snd_pcm_hw_params *hw_params)
525{
526 int ret;
527
528 dprintk("Setting capture parameters\n");
529
530 ret = snd_pcm_alloc_vmalloc_buffer(substream,
531 params_buffer_bytes(hw_params));
532#if 0
533
534
535
536 unsigned int channels, rate, format;
537
538 format = params_format(hw_params);
539 rate = params_rate(hw_params);
540 channels = params_channels(hw_params);
541#endif
542
543 return ret;
544}
545
546static int snd_cx231xx_hw_capture_free(struct snd_pcm_substream *substream)
547{
548 struct cx231xx *dev = snd_pcm_substream_chip(substream);
549
550 dprintk("Stop capture, if needed\n");
551
552 if (atomic_read(&dev->stream_started) > 0) {
553 atomic_set(&dev->stream_started, 0);
554 schedule_work(&dev->wq_trigger);
555 }
556
557 return 0;
558}
559
560static int snd_cx231xx_prepare(struct snd_pcm_substream *substream)
561{
562 struct cx231xx *dev = snd_pcm_substream_chip(substream);
563
564 dev->adev.hwptr_done_capture = 0;
565 dev->adev.capture_transfer_done = 0;
566
567 return 0;
568}
569
570static void audio_trigger(struct work_struct *work)
571{
572 struct cx231xx *dev = container_of(work, struct cx231xx, wq_trigger);
573
574 if (atomic_read(&dev->stream_started)) {
575 dprintk("starting capture");
576 if (is_fw_load(dev) == 0)
577 cx25840_call(dev, core, load_fw);
578 if (dev->USE_ISO)
579 cx231xx_init_audio_isoc(dev);
580 else
581 cx231xx_init_audio_bulk(dev);
582 } else {
583 dprintk("stopping capture");
584 cx231xx_isoc_audio_deinit(dev);
585 }
586}
587
588static int snd_cx231xx_capture_trigger(struct snd_pcm_substream *substream,
589 int cmd)
590{
591 struct cx231xx *dev = snd_pcm_substream_chip(substream);
592 int retval = 0;
593
594 if (dev->state & DEV_DISCONNECTED)
595 return -ENODEV;
596
597 spin_lock(&dev->adev.slock);
598 switch (cmd) {
599 case SNDRV_PCM_TRIGGER_START:
600 atomic_set(&dev->stream_started, 1);
601 break;
602 case SNDRV_PCM_TRIGGER_STOP:
603 atomic_set(&dev->stream_started, 0);
604 break;
605 default:
606 retval = -EINVAL;
607 break;
608 }
609 spin_unlock(&dev->adev.slock);
610
611 schedule_work(&dev->wq_trigger);
612
613 return retval;
614}
615
616static snd_pcm_uframes_t snd_cx231xx_capture_pointer(struct snd_pcm_substream
617 *substream)
618{
619 struct cx231xx *dev;
620 unsigned long flags;
621 snd_pcm_uframes_t hwptr_done;
622
623 dev = snd_pcm_substream_chip(substream);
624
625 spin_lock_irqsave(&dev->adev.slock, flags);
626 hwptr_done = dev->adev.hwptr_done_capture;
627 spin_unlock_irqrestore(&dev->adev.slock, flags);
628
629 return hwptr_done;
630}
631
632static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
633 unsigned long offset)
634{
635 void *pageptr = subs->runtime->dma_area + offset;
636
637 return vmalloc_to_page(pageptr);
638}
639
640static struct snd_pcm_ops snd_cx231xx_pcm_capture = {
641 .open = snd_cx231xx_capture_open,
642 .close = snd_cx231xx_pcm_close,
643 .ioctl = snd_pcm_lib_ioctl,
644 .hw_params = snd_cx231xx_hw_capture_params,
645 .hw_free = snd_cx231xx_hw_capture_free,
646 .prepare = snd_cx231xx_prepare,
647 .trigger = snd_cx231xx_capture_trigger,
648 .pointer = snd_cx231xx_capture_pointer,
649 .page = snd_pcm_get_vmalloc_page,
650};
651
652static int cx231xx_audio_init(struct cx231xx *dev)
653{
654 struct cx231xx_audio *adev = &dev->adev;
655 struct snd_pcm *pcm;
656 struct snd_card *card;
657 static int devnr;
658 int err;
659 struct usb_interface *uif;
660 int i, isoc_pipe = 0;
661
662 if (dev->has_alsa_audio != 1) {
663
664
665
666 return 0;
667 }
668
669 cx231xx_info("cx231xx-audio.c: probing for cx231xx "
670 "non standard usbaudio\n");
671
672 err = snd_card_create(index[devnr], "Cx231xx Audio", THIS_MODULE,
673 0, &card);
674 if (err < 0)
675 return err;
676
677 spin_lock_init(&adev->slock);
678 err = snd_pcm_new(card, "Cx231xx Audio", 0, 0, 1, &pcm);
679 if (err < 0) {
680 snd_card_free(card);
681 return err;
682 }
683
684 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
685 &snd_cx231xx_pcm_capture);
686 pcm->info_flags = 0;
687 pcm->private_data = dev;
688 strcpy(pcm->name, "Conexant cx231xx Capture");
689 snd_card_set_dev(card, &dev->udev->dev);
690 strcpy(card->driver, "Cx231xx-Audio");
691 strcpy(card->shortname, "Cx231xx Audio");
692 strcpy(card->longname, "Conexant cx231xx Audio");
693
694 INIT_WORK(&dev->wq_trigger, audio_trigger);
695
696 err = snd_card_register(card);
697 if (err < 0) {
698 snd_card_free(card);
699 return err;
700 }
701 adev->sndcard = card;
702 adev->udev = dev->udev;
703
704
705 uif =
706 dev->udev->actconfig->interface[dev->current_pcb_config.
707 hs_config_info[0].interface_info.
708 audio_index + 1];
709
710 adev->end_point_addr =
711 le16_to_cpu(uif->altsetting[0].endpoint[isoc_pipe].desc.
712 bEndpointAddress);
713
714 adev->num_alt = uif->num_altsetting;
715 cx231xx_info("EndPoint Addr 0x%x, Alternate settings: %i\n",
716 adev->end_point_addr, adev->num_alt);
717 adev->alt_max_pkt_size = kmalloc(32 * adev->num_alt, GFP_KERNEL);
718
719 if (adev->alt_max_pkt_size == NULL) {
720 cx231xx_errdev("out of memory!\n");
721 return -ENOMEM;
722 }
723
724 for (i = 0; i < adev->num_alt; i++) {
725 u16 tmp =
726 le16_to_cpu(uif->altsetting[i].endpoint[isoc_pipe].desc.
727 wMaxPacketSize);
728 adev->alt_max_pkt_size[i] =
729 (tmp & 0x07ff) * (((tmp & 0x1800) >> 11) + 1);
730 cx231xx_info("Alternate setting %i, max size= %i\n", i,
731 adev->alt_max_pkt_size[i]);
732 }
733
734 return 0;
735}
736
737static int cx231xx_audio_fini(struct cx231xx *dev)
738{
739 if (dev == NULL)
740 return 0;
741
742 if (dev->has_alsa_audio != 1) {
743
744
745
746 return 0;
747 }
748
749 if (dev->adev.sndcard) {
750 snd_card_free(dev->adev.sndcard);
751 kfree(dev->adev.alt_max_pkt_size);
752 dev->adev.sndcard = NULL;
753 }
754
755 return 0;
756}
757
758static struct cx231xx_ops audio_ops = {
759 .id = CX231XX_AUDIO,
760 .name = "Cx231xx Audio Extension",
761 .init = cx231xx_audio_init,
762 .fini = cx231xx_audio_fini,
763};
764
765static int __init cx231xx_alsa_register(void)
766{
767 return cx231xx_register_extension(&audio_ops);
768}
769
770static void __exit cx231xx_alsa_unregister(void)
771{
772 cx231xx_unregister_extension(&audio_ops);
773}
774
775MODULE_LICENSE("GPL");
776MODULE_AUTHOR("Srinivasa Deevi <srinivasa.deevi@conexant.com>");
777MODULE_DESCRIPTION("Cx231xx Audio driver");
778
779module_init(cx231xx_alsa_register);
780module_exit(cx231xx_alsa_unregister);
781
