drivers/media/usb/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;
 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         /* set alternate setting for audio interface */
 453         /* 1 - 48000 samples per sec */
 454         mutex_lock(&dev->lock);
 455         if (dev->USE_ISO)
 456                 ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 1);
 457         else
 458                 ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 0);
 459         mutex_unlock(&dev->lock);
 460         if (ret < 0) {
 461                 cx231xx_errdev("failed to set alternate setting !\n");
 462
 463                 return ret;
 464         }
 465
 466         runtime->hw = snd_cx231xx_hw_capture;
 467
 468         mutex_lock(&dev->lock);
 469         /* inform hardware to start streaming */
 470         ret = cx231xx_capture_start(dev, 1, Audio);
 471
 472         dev->adev.users++;
 473         mutex_unlock(&dev->lock);
 474
 475         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
 476         dev->adev.capture_pcm_substream = substream;
 477         runtime->private_data = dev;
 478
 479         return 0;
 480 }
 481
 482 static int snd_cx231xx_pcm_close(struct snd_pcm_substream *substream)
 483 {
 484         int ret;
 485         struct cx231xx *dev = snd_pcm_substream_chip(substream);
 486
 487         dprintk("closing device\n");
 488
 489         /* inform hardware to stop streaming */
 490         mutex_lock(&dev->lock);
 491         ret = cx231xx_capture_start(dev, 0, Audio);
 492
 493         /* set alternate setting for audio interface */
 494         /* 1 - 48000 samples per sec */
 495         ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 0);
 496         if (ret < 0) {
 497                 cx231xx_errdev("failed to set alternate setting !\n");
 498
 499                 mutex_unlock(&dev->lock);
 500                 return ret;
 501         }
 502
 503         dev->adev.users--;
 504         mutex_unlock(&dev->lock);
 505
 506         if (dev->adev.users == 0 && dev->adev.shutdown == 1) {
 507                 dprintk("audio users: %d\n", dev->adev.users);
 508                 dprintk("disabling audio stream!\n");
 509                 dev->adev.shutdown = 0;
 510                 dprintk("released lock\n");
 511                 if (atomic_read(&dev->stream_started) > 0) {
 512                         atomic_set(&dev->stream_started, 0);
 513                         schedule_work(&dev->wq_trigger);
 514                 }
 515         }
 516         return 0;
 517 }
 518
 519 static int snd_cx231xx_hw_capture_params(struct snd_pcm_substream *substream,
 520                                          struct snd_pcm_hw_params *hw_params)
 521 {
 522         int ret;
 523
 524         dprintk("Setting capture parameters\n");
 525
 526         ret = snd_pcm_alloc_vmalloc_buffer(substream,
 527                                            params_buffer_bytes(hw_params));
 528 #if 0
 529         /* TODO: set up cx231xx audio chip to deliver the correct audio format,
 530            current default is 48000hz multiplexed => 96000hz mono
 531            which shouldn't matter since analogue TV only supports mono */
 532         unsigned int channels, rate, format;
 533
 534         format = params_format(hw_params);
 535         rate = params_rate(hw_params);
 536         channels = params_channels(hw_params);
 537 #endif
 538
 539         return ret;
 540 }
 541
 542 static int snd_cx231xx_hw_capture_free(struct snd_pcm_substream *substream)
 543 {
 544         struct cx231xx *dev = snd_pcm_substream_chip(substream);
 545
 546         dprintk("Stop capture, if needed\n");
 547
 548         if (atomic_read(&dev->stream_started) > 0) {
 549                 atomic_set(&dev->stream_started, 0);
 550                 schedule_work(&dev->wq_trigger);
 551         }
 552
 553         return 0;
 554 }
 555
 556 static int snd_cx231xx_prepare(struct snd_pcm_substream *substream)
 557 {
 558         struct cx231xx *dev = snd_pcm_substream_chip(substream);
 559
 560         dev->adev.hwptr_done_capture = 0;
 561         dev->adev.capture_transfer_done = 0;
 562
 563         return 0;
 564 }
 565
 566 static void audio_trigger(struct work_struct *work)
 567 {
 568         struct cx231xx *dev = container_of(work, struct cx231xx, wq_trigger);
 569
 570         if (atomic_read(&dev->stream_started)) {
 571                 dprintk("starting capture");
 572                 if (is_fw_load(dev) == 0)
 573                         cx25840_call(dev, core, load_fw);
 574                 if (dev->USE_ISO)
 575                         cx231xx_init_audio_isoc(dev);
 576                 else
 577                         cx231xx_init_audio_bulk(dev);
 578         } else {
 579                 dprintk("stopping capture");
 580                 cx231xx_isoc_audio_deinit(dev);
 581         }
 582 }
 583
 584 static int snd_cx231xx_capture_trigger(struct snd_pcm_substream *substream,
 585                                        int cmd)
 586 {
 587         struct cx231xx *dev = snd_pcm_substream_chip(substream);
 588         int retval = 0;
 589
 590         if (dev->state & DEV_DISCONNECTED)
 591                 return -ENODEV;
 592
 593         spin_lock(&dev->adev.slock);
 594         switch (cmd) {
 595         case SNDRV_PCM_TRIGGER_START:
 596                 atomic_set(&dev->stream_started, 1);
 597                 break;
 598         case SNDRV_PCM_TRIGGER_STOP:
 599                 atomic_set(&dev->stream_started, 0);
 600                 break;
 601         default:
 602                 retval = -EINVAL;
 603                 break;
 604         }
 605         spin_unlock(&dev->adev.slock);
 606
 607         schedule_work(&dev->wq_trigger);
 608
 609         return retval;
 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_new(&dev->udev->dev, index[devnr], "Cx231xx Audio",
 669                            THIS_MODULE, 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         strcpy(card->driver, "Cx231xx-Audio");
 686         strcpy(card->shortname, "Cx231xx Audio");
 687         strcpy(card->longname, "Conexant cx231xx Audio");
 688
 689         INIT_WORK(&dev->wq_trigger, audio_trigger);
 690
 691         err = snd_card_register(card);
 692         if (err < 0) {
 693                 snd_card_free(card);
 694                 return err;
 695         }
 696         adev->sndcard = card;
 697         adev->udev = dev->udev;
 698
 699         /* compute alternate max packet sizes for Audio */
 700         uif =
 701             dev->udev->actconfig->interface[dev->current_pcb_config.
 702                                             hs_config_info[0].interface_info.
 703                                             audio_index + 1];
 704
 705         adev->end_point_addr =
 706             uif->altsetting[0].endpoint[isoc_pipe].desc.
 707                         bEndpointAddress;
 708
 709         adev->num_alt = uif->num_altsetting;
 710         cx231xx_info("EndPoint Addr 0x%x, Alternate settings: %i\n",
 711                      adev->end_point_addr, adev->num_alt);
 712         adev->alt_max_pkt_size = kmalloc(32 * adev->num_alt, GFP_KERNEL);
 713
 714         if (adev->alt_max_pkt_size == NULL) {
 715                 cx231xx_errdev("out of memory!\n");
 716                 return -ENOMEM;
 717         }
 718
 719         for (i = 0; i < adev->num_alt; i++) {
 720                 u16 tmp =
 721                     le16_to_cpu(uif->altsetting[i].endpoint[isoc_pipe].desc.
 722                                 wMaxPacketSize);
 723                 adev->alt_max_pkt_size[i] =
 724                     (tmp & 0x07ff) * (((tmp & 0x1800) >> 11) + 1);
 725                 cx231xx_info("Alternate setting %i, max size= %i\n", i,
 726                              adev->alt_max_pkt_size[i]);
 727         }
 728
 729         return 0;
 730 }
 731
 732 static int cx231xx_audio_fini(struct cx231xx *dev)
 733 {
 734         if (dev == NULL)
 735                 return 0;
 736
 737         if (dev->has_alsa_audio != 1) {
 738                 /* This device does not support the extension (in this case
 739                    the device is expecting the snd-usb-audio module or
 740                    doesn't have analog audio support at all) */
 741                 return 0;
 742         }
 743
 744         if (dev->adev.sndcard) {
 745                 snd_card_free(dev->adev.sndcard);
 746                 kfree(dev->adev.alt_max_pkt_size);
 747                 dev->adev.sndcard = NULL;
 748         }
 749
 750         return 0;
 751 }
 752
 753 static struct cx231xx_ops audio_ops = {
 754         .id = CX231XX_AUDIO,
 755         .name = "Cx231xx Audio Extension",
 756         .init = cx231xx_audio_init,
 757         .fini = cx231xx_audio_fini,
 758 };
 759
 760 static int __init cx231xx_alsa_register(void)
 761 {
 762         return cx231xx_register_extension(&audio_ops);
 763 }
 764
 765 static void __exit cx231xx_alsa_unregister(void)
 766 {
 767         cx231xx_unregister_extension(&audio_ops);
 768 }
 769
 770 MODULE_LICENSE("GPL");
 771 MODULE_AUTHOR("Srinivasa Deevi <srinivasa.deevi@conexant.com>");
 772 MODULE_DESCRIPTION("Cx231xx Audio driver");
 773
 774 module_init(cx231xx_alsa_register);
 775 module_exit(cx231xx_alsa_unregister);