Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab...
[linux-2.6.git] / drivers / media / video / cx231xx / cx231xx-audio.c
1 /*
2  *  Conexant Cx231xx audio extension
3  *
4  *  Copyright (C) 2008 <srinivasa.deevi at conexant dot com>
5  *       Based on em28xx driver
6  *
7  *
8  *  This program is free software; you can redistribute it and/or modify
9  *  it under the terms of the GNU General Public License as published by
10  *  the Free Software Foundation; either version 2 of the License, or
11  *  (at your option) any later version.
12  *
13  *  This program is distributed in the hope that it will be useful,
14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  *  GNU General Public License for more details.
17  *
18  *  You should have received a copy of the GNU General Public License
19  *  along with this program; if not, write to the Free Software
20  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21  */
22
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
42 static int debug;
43 module_param(debug, int, 0644);
44 MODULE_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
52 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
53
54 static 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
78 static 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
102 static 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:         /* success */
119         case -ETIMEDOUT:        /* NAK */
120                 break;
121         case -ECONNRESET:       /* kill */
122         case -ENOENT:
123         case -ESHUTDOWN:
124                 return;
125         default:                /* error */
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
191 static 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:         /* success */
207         case -ETIMEDOUT:        /* NAK */
208                 break;
209         case -ECONNRESET:       /* kill */
210         case -ENOENT:
211         case -ESHUTDOWN:
212                 return;
213         default:                /* error */
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
275 static 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 | URB_NO_TRANSFER_DMA_MAP;
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
336 static 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 = URB_NO_TRANSFER_DMA_MAP;
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
391 static 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
412 static 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,  /* just about the value in usbaudio.c */
427         .period_bytes_min = 64,         /* 12544/2, */
428         .period_bytes_max = 12544,
429         .periods_min = 2,
430         .periods_max = 98,              /* 12544, */
431 };
432
433 static 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         /* Sets volume, mute, etc */
453         dev->mute = 0;
454
455         /* set alternate setting for audio interface */
456         /* 1 - 48000 samples per sec */
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         /* inform hardware to start streaming */
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
485 static 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         /* inform hardware to stop streaming */
493         mutex_lock(&dev->lock);
494         ret = cx231xx_capture_start(dev, 0, Audio);
495
496         /* set alternate setting for audio interface */
497         /* 1 - 48000 samples per sec */
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
523 static int snd_cx231xx_hw_capture_params(struct snd_pcm_substream *substream,
524                                          struct snd_pcm_hw_params *hw_params)
525 {
526         unsigned int channels, rate, format;
527         int ret;
528
529         dprintk("Setting capture parameters\n");
530
531         ret = snd_pcm_alloc_vmalloc_buffer(substream,
532                                            params_buffer_bytes(hw_params));
533         format = params_format(hw_params);
534         rate = params_rate(hw_params);
535         channels = params_channels(hw_params);
536
537         /* TODO: set up cx231xx audio chip to deliver the correct audio format,
538            current default is 48000hz multiplexed => 96000hz mono
539            which shouldn't matter since analogue TV only supports mono */
540         return 0;
541 }
542
543 static int snd_cx231xx_hw_capture_free(struct snd_pcm_substream *substream)
544 {
545         struct cx231xx *dev = snd_pcm_substream_chip(substream);
546
547         dprintk("Stop capture, if needed\n");
548
549         if (atomic_read(&dev->stream_started) > 0) {
550                 atomic_set(&dev->stream_started, 0);
551                 schedule_work(&dev->wq_trigger);
552         }
553
554         return 0;
555 }
556
557 static int snd_cx231xx_prepare(struct snd_pcm_substream *substream)
558 {
559         struct cx231xx *dev = snd_pcm_substream_chip(substream);
560
561         dev->adev.hwptr_done_capture = 0;
562         dev->adev.capture_transfer_done = 0;
563
564         return 0;
565 }
566
567 static void audio_trigger(struct work_struct *work)
568 {
569         struct cx231xx *dev = container_of(work, struct cx231xx, wq_trigger);
570
571         if (atomic_read(&dev->stream_started)) {
572                 dprintk("starting capture");
573                 if (is_fw_load(dev) == 0)
574                         cx25840_call(dev, core, load_fw);
575                 if (dev->USE_ISO)
576                         cx231xx_init_audio_isoc(dev);
577                 else
578                         cx231xx_init_audio_bulk(dev);
579         } else {
580                 dprintk("stopping capture");
581                 cx231xx_isoc_audio_deinit(dev);
582         }
583 }
584
585 static int snd_cx231xx_capture_trigger(struct snd_pcm_substream *substream,
586                                        int cmd)
587 {
588         struct cx231xx *dev = snd_pcm_substream_chip(substream);
589         int retval;
590
591         if (dev->state & DEV_DISCONNECTED)
592                 return -ENODEV;
593
594         spin_lock(&dev->adev.slock);
595         switch (cmd) {
596         case SNDRV_PCM_TRIGGER_START:
597                 atomic_set(&dev->stream_started, 1);
598                 break;
599         case SNDRV_PCM_TRIGGER_STOP:
600                 atomic_set(&dev->stream_started, 0);
601                 break;
602         default:
603                 retval = -EINVAL;
604         }
605         spin_unlock(&dev->adev.slock);
606
607         schedule_work(&dev->wq_trigger);
608
609         return 0;
610 }
611
612 static snd_pcm_uframes_t snd_cx231xx_capture_pointer(struct snd_pcm_substream
613                                                      *substream)
614 {
615         struct cx231xx *dev;
616         unsigned long flags;
617         snd_pcm_uframes_t hwptr_done;
618
619         dev = snd_pcm_substream_chip(substream);
620
621         spin_lock_irqsave(&dev->adev.slock, flags);
622         hwptr_done = dev->adev.hwptr_done_capture;
623         spin_unlock_irqrestore(&dev->adev.slock, flags);
624
625         return hwptr_done;
626 }
627
628 static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
629                                              unsigned long offset)
630 {
631         void *pageptr = subs->runtime->dma_area + offset;
632
633         return vmalloc_to_page(pageptr);
634 }
635
636 static struct snd_pcm_ops snd_cx231xx_pcm_capture = {
637         .open = snd_cx231xx_capture_open,
638         .close = snd_cx231xx_pcm_close,
639         .ioctl = snd_pcm_lib_ioctl,
640         .hw_params = snd_cx231xx_hw_capture_params,
641         .hw_free = snd_cx231xx_hw_capture_free,
642         .prepare = snd_cx231xx_prepare,
643         .trigger = snd_cx231xx_capture_trigger,
644         .pointer = snd_cx231xx_capture_pointer,
645         .page = snd_pcm_get_vmalloc_page,
646 };
647
648 static int cx231xx_audio_init(struct cx231xx *dev)
649 {
650         struct cx231xx_audio *adev = &dev->adev;
651         struct snd_pcm *pcm;
652         struct snd_card *card;
653         static int devnr;
654         int err;
655         struct usb_interface *uif;
656         int i, isoc_pipe = 0;
657
658         if (dev->has_alsa_audio != 1) {
659                 /* This device does not support the extension (in this case
660                    the device is expecting the snd-usb-audio module or
661                    doesn't have analog audio support at all) */
662                 return 0;
663         }
664
665         cx231xx_info("cx231xx-audio.c: probing for cx231xx "
666                      "non standard usbaudio\n");
667
668         err = snd_card_create(index[devnr], "Cx231xx Audio", THIS_MODULE,
669                               0, &card);
670         if (err < 0)
671                 return err;
672
673         spin_lock_init(&adev->slock);
674         err = snd_pcm_new(card, "Cx231xx Audio", 0, 0, 1, &pcm);
675         if (err < 0) {
676                 snd_card_free(card);
677                 return err;
678         }
679
680         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
681                         &snd_cx231xx_pcm_capture);
682         pcm->info_flags = 0;
683         pcm->private_data = dev;
684         strcpy(pcm->name, "Conexant cx231xx Capture");
685         snd_card_set_dev(card, &dev->udev->dev);
686         strcpy(card->driver, "Cx231xx-Audio");
687         strcpy(card->shortname, "Cx231xx Audio");
688         strcpy(card->longname, "Conexant cx231xx Audio");
689
690         INIT_WORK(&dev->wq_trigger, audio_trigger);
691
692         err = snd_card_register(card);
693         if (err < 0) {
694                 snd_card_free(card);
695                 return err;
696         }
697         adev->sndcard = card;
698         adev->udev = dev->udev;
699
700         /* compute alternate max packet sizes for Audio */
701         uif =
702             dev->udev->actconfig->interface[dev->current_pcb_config.
703                                             hs_config_info[0].interface_info.
704                                             audio_index + 1];
705
706         adev->end_point_addr =
707             le16_to_cpu(uif->altsetting[0].endpoint[isoc_pipe].desc.
708                         bEndpointAddress);
709
710         adev->num_alt = uif->num_altsetting;
711         cx231xx_info("EndPoint Addr 0x%x, Alternate settings: %i\n",
712                      adev->end_point_addr, adev->num_alt);
713         adev->alt_max_pkt_size = kmalloc(32 * adev->num_alt, GFP_KERNEL);
714
715         if (adev->alt_max_pkt_size == NULL) {
716                 cx231xx_errdev("out of memory!\n");
717                 return -ENOMEM;
718         }
719
720         for (i = 0; i < adev->num_alt; i++) {
721                 u16 tmp =
722                     le16_to_cpu(uif->altsetting[i].endpoint[isoc_pipe].desc.
723                                 wMaxPacketSize);
724                 adev->alt_max_pkt_size[i] =
725                     (tmp & 0x07ff) * (((tmp & 0x1800) >> 11) + 1);
726                 cx231xx_info("Alternate setting %i, max size= %i\n", i,
727                              adev->alt_max_pkt_size[i]);
728         }
729
730         return 0;
731 }
732
733 static int cx231xx_audio_fini(struct cx231xx *dev)
734 {
735         if (dev == NULL)
736                 return 0;
737
738         if (dev->has_alsa_audio != 1) {
739                 /* This device does not support the extension (in this case
740                    the device is expecting the snd-usb-audio module or
741                    doesn't have analog audio support at all) */
742                 return 0;
743         }
744
745         if (dev->adev.sndcard) {
746                 snd_card_free(dev->adev.sndcard);
747                 kfree(dev->adev.alt_max_pkt_size);
748                 dev->adev.sndcard = NULL;
749         }
750
751         return 0;
752 }
753
754 static struct cx231xx_ops audio_ops = {
755         .id = CX231XX_AUDIO,
756         .name = "Cx231xx Audio Extension",
757         .init = cx231xx_audio_init,
758         .fini = cx231xx_audio_fini,
759 };
760
761 static int __init cx231xx_alsa_register(void)
762 {
763         return cx231xx_register_extension(&audio_ops);
764 }
765
766 static void __exit cx231xx_alsa_unregister(void)
767 {
768         cx231xx_unregister_extension(&audio_ops);
769 }
770
771 MODULE_LICENSE("GPL");
772 MODULE_AUTHOR("Srinivasa Deevi <srinivasa.deevi@conexant.com>");
773 MODULE_DESCRIPTION("Cx231xx Audio driver");
774
775 module_init(cx231xx_alsa_register);
776 module_exit(cx231xx_alsa_unregister);