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cx231xx-audio.c
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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;
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 = 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 
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  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  /* TODO: set up cx231xx audio chip to deliver the correct audio format,
534  current default is 48000hz multiplexed => 96000hz mono
535  which shouldn't matter since analogue TV only supports mono */
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 
546 static 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 
560 static 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 
570 static 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 
588 static 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 
616 static 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 
632 static 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 
640 static 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 
652 static 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  /* This device does not support the extension (in this case
664  the device is expecting the snd-usb-audio module or
665  doesn't have analog audio support at all) */
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  /* compute alternate max packet sizes for Audio */
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 
737 static int cx231xx_audio_fini(struct cx231xx *dev)
738 {
739  if (dev == NULL)
740  return 0;
741 
742  if (dev->has_alsa_audio != 1) {
743  /* This device does not support the extension (in this case
744  the device is expecting the snd-usb-audio module or
745  doesn't have analog audio support at all) */
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 
758 static 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 
765 static int __init cx231xx_alsa_register(void)
766 {
767  return cx231xx_register_extension(&audio_ops);
768 }
769 
770 static void __exit cx231xx_alsa_unregister(void)
771 {
772  cx231xx_unregister_extension(&audio_ops);
773 }
774 
775 MODULE_LICENSE("GPL");
776 MODULE_AUTHOR("Srinivasa Deevi <[email protected]>");
777 MODULE_DESCRIPTION("Cx231xx Audio driver");
778 
779 module_init(cx231xx_alsa_register);
780 module_exit(cx231xx_alsa_unregister);
Generated on Thu Jan 10 2013 13:50:58 for Linux Kernel by   doxygen 1.8.2