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         switch (urb->status) {
 115         case 0:         /* success */
 116         case -ETIMEDOUT:        /* NAK */
 117                 break;
 118         case -ECONNRESET:       /* kill */
 119         case -ENOENT:
 120         case -ESHUTDOWN:
 121                 return;
 122         default:                /* error */
 123                 dprintk("urb completition error %d.\n", urb->status);
 124                 break;
 125         }
 126
 127         if (atomic_read(&dev->stream_started) == 0)
 128                 return;
 129
 130         if (dev->adev.capture_pcm_substream) {
 131                 substream = dev->adev.capture_pcm_substream;
 132                 runtime = substream->runtime;
 133                 stride = runtime->frame_bits >> 3;
 134
 135                 for (i = 0; i < urb->number_of_packets; i++) {
 136                         int length = urb->iso_frame_desc[i].actual_length /
 137                                      stride;
 138                         cp = (unsigned char *)urb->transfer_buffer +
 139                                               urb->iso_frame_desc[i].offset;
 140
 141                         if (!length)
 142                                 continue;
 143
 144                         oldptr = dev->adev.hwptr_done_capture;
 145                         if (oldptr + length >= runtime->buffer_size) {
 146                                 unsigned int cnt;
 147
 148                                 cnt = runtime->buffer_size - oldptr;
 149                                 memcpy(runtime->dma_area + oldptr * stride, cp,
 150                                        cnt * stride);
 151                                 memcpy(runtime->dma_area, cp + cnt * stride,
 152                                        length * stride - cnt * stride);
 153                         } else {
 154                                 memcpy(runtime->dma_area + oldptr * stride, cp,
 155                                        length * stride);
 156                         }
 157
 158                         snd_pcm_stream_lock(substream);
 159
 160                         dev->adev.hwptr_done_capture += length;
 161                         if (dev->adev.hwptr_done_capture >=
 162                                                 runtime->buffer_size)
 163                                 dev->adev.hwptr_done_capture -=
 164                                                 runtime->buffer_size;
 165
 166                         dev->adev.capture_transfer_done += length;
 167                         if (dev->adev.capture_transfer_done >=
 168                                 runtime->period_size) {
 169                                 dev->adev.capture_transfer_done -=
 170                                                 runtime->period_size;
 171                                 period_elapsed = 1;
 172                         }
 173                         snd_pcm_stream_unlock(substream);
 174                 }
 175                 if (period_elapsed)
 176                         snd_pcm_period_elapsed(substream);
 177         }
 178         urb->status = 0;
 179
 180         status = usb_submit_urb(urb, GFP_ATOMIC);
 181         if (status < 0) {
 182                 cx231xx_errdev("resubmit of audio urb failed (error=%i)\n",
 183                                status);
 184         }
 185         return;
 186 }
 187
 188 static void cx231xx_audio_bulkirq(struct urb *urb)
 189 {
 190         struct cx231xx *dev = urb->context;
 191         unsigned int oldptr;
 192         int period_elapsed = 0;
 193         int status;
 194         unsigned char *cp;
 195         unsigned int stride;
 196         struct snd_pcm_substream *substream;
 197         struct snd_pcm_runtime *runtime;
 198
 199         switch (urb->status) {
 200         case 0:         /* success */
 201         case -ETIMEDOUT:        /* NAK */
 202                 break;
 203         case -ECONNRESET:       /* kill */
 204         case -ENOENT:
 205         case -ESHUTDOWN:
 206                 return;
 207         default:                /* error */
 208                 dprintk("urb completition error %d.\n", urb->status);
 209                 break;
 210         }
 211
 212         if (atomic_read(&dev->stream_started) == 0)
 213                 return;
 214
 215         if (dev->adev.capture_pcm_substream) {
 216                 substream = dev->adev.capture_pcm_substream;
 217                 runtime = substream->runtime;
 218                 stride = runtime->frame_bits >> 3;
 219
 220                 if (1) {
 221                         int length = urb->actual_length /
 222                                      stride;
 223                         cp = (unsigned char *)urb->transfer_buffer;
 224
 225                         oldptr = dev->adev.hwptr_done_capture;
 226                         if (oldptr + length >= runtime->buffer_size) {
 227                                 unsigned int cnt;
 228
 229                                 cnt = runtime->buffer_size - oldptr;
 230                                 memcpy(runtime->dma_area + oldptr * stride, cp,
 231                                        cnt * stride);
 232                                 memcpy(runtime->dma_area, cp + cnt * stride,
 233                                        length * stride - cnt * stride);
 234                         } else {
 235                                 memcpy(runtime->dma_area + oldptr * stride, cp,
 236                                        length * stride);
 237                         }
 238
 239                         snd_pcm_stream_lock(substream);
 240
 241                         dev->adev.hwptr_done_capture += length;
 242                         if (dev->adev.hwptr_done_capture >=
 243                                                 runtime->buffer_size)
 244                                 dev->adev.hwptr_done_capture -=
 245                                                 runtime->buffer_size;
 246
 247                         dev->adev.capture_transfer_done += length;
 248                         if (dev->adev.capture_transfer_done >=
 249                                 runtime->period_size) {
 250                                 dev->adev.capture_transfer_done -=
 251                                                 runtime->period_size;
 252                                 period_elapsed = 1;
 253                         }
 254                         snd_pcm_stream_unlock(substream);
 255                 }
 256                 if (period_elapsed)
 257                         snd_pcm_period_elapsed(substream);
 258         }
 259         urb->status = 0;
 260
 261         status = usb_submit_urb(urb, GFP_ATOMIC);
 262         if (status < 0) {
 263                 cx231xx_errdev("resubmit of audio urb failed (error=%i)\n",
 264                                status);
 265         }
 266         return;
 267 }
 268
 269 static int cx231xx_init_audio_isoc(struct cx231xx *dev)
 270 {
 271         int i, errCode;
 272         int sb_size;
 273
 274         cx231xx_info("%s: Starting ISO AUDIO transfers\n", __func__);
 275
 276         sb_size = CX231XX_ISO_NUM_AUDIO_PACKETS * dev->adev.max_pkt_size;
 277
 278         for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
 279                 struct urb *urb;
 280                 int j, k;
 281
 282                 dev->adev.transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC);
 283                 if (!dev->adev.transfer_buffer[i])
 284                         return -ENOMEM;
 285
 286                 memset(dev->adev.transfer_buffer[i], 0x80, sb_size);
 287                 urb = usb_alloc_urb(CX231XX_ISO_NUM_AUDIO_PACKETS, GFP_ATOMIC);
 288                 if (!urb) {
 289                         cx231xx_errdev("usb_alloc_urb failed!\n");
 290                         for (j = 0; j < i; j++) {
 291                                 usb_free_urb(dev->adev.urb[j]);
 292                                 kfree(dev->adev.transfer_buffer[j]);
 293                         }
 294                         return -ENOMEM;
 295                 }
 296
 297                 urb->dev = dev->udev;
 298                 urb->context = dev;
 299                 urb->pipe = usb_rcvisocpipe(dev->udev,
 300                                                 dev->adev.end_point_addr);
 301                 urb->transfer_flags = URB_ISO_ASAP;
 302                 urb->transfer_buffer = dev->adev.transfer_buffer[i];
 303                 urb->interval = 1;
 304                 urb->complete = cx231xx_audio_isocirq;
 305                 urb->number_of_packets = CX231XX_ISO_NUM_AUDIO_PACKETS;
 306                 urb->transfer_buffer_length = sb_size;
 307
 308                 for (j = k = 0; j < CX231XX_ISO_NUM_AUDIO_PACKETS;
 309                         j++, k += dev->adev.max_pkt_size) {
 310                         urb->iso_frame_desc[j].offset = k;
 311                         urb->iso_frame_desc[j].length = dev->adev.max_pkt_size;
 312                 }
 313                 dev->adev.urb[i] = urb;
 314         }
 315
 316         for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
 317                 errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC);
 318                 if (errCode < 0) {
 319                         cx231xx_isoc_audio_deinit(dev);
 320                         return errCode;
 321                 }
 322         }
 323
 324         return errCode;
 325 }
 326
 327 static int cx231xx_init_audio_bulk(struct cx231xx *dev)
 328 {
 329         int i, errCode;
 330         int sb_size;
 331
 332         cx231xx_info("%s: Starting BULK AUDIO transfers\n", __func__);
 333
 334         sb_size = CX231XX_NUM_AUDIO_PACKETS * dev->adev.max_pkt_size;
 335
 336         for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
 337                 struct urb *urb;
 338                 int j;
 339
 340                 dev->adev.transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC);
 341                 if (!dev->adev.transfer_buffer[i])
 342                         return -ENOMEM;
 343
 344                 memset(dev->adev.transfer_buffer[i], 0x80, sb_size);
 345                 urb = usb_alloc_urb(CX231XX_NUM_AUDIO_PACKETS, GFP_ATOMIC);
 346                 if (!urb) {
 347                         cx231xx_errdev("usb_alloc_urb failed!\n");
 348                         for (j = 0; j < i; j++) {
 349                                 usb_free_urb(dev->adev.urb[j]);
 350                                 kfree(dev->adev.transfer_buffer[j]);
 351                         }
 352                         return -ENOMEM;
 353                 }
 354
 355                 urb->dev = dev->udev;
 356                 urb->context = dev;
 357                 urb->pipe = usb_rcvbulkpipe(dev->udev,
 358                                                 dev->adev.end_point_addr);
 359                 urb->transfer_flags = 0;
 360                 urb->transfer_buffer = dev->adev.transfer_buffer[i];
 361                 urb->complete = cx231xx_audio_bulkirq;
 362                 urb->transfer_buffer_length = sb_size;
 363
 364                 dev->adev.urb[i] = urb;
 365
 366         }
 367
 368         for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
 369                 errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC);
 370                 if (errCode < 0) {
 371                         cx231xx_bulk_audio_deinit(dev);
 372                         return errCode;
 373                 }
 374         }
 375
 376         return errCode;
 377 }
 378
 379 static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
 380                                         size_t size)
 381 {
 382         struct snd_pcm_runtime *runtime = subs->runtime;
 383
 384         dprintk("Allocating vbuffer\n");
 385         if (runtime->dma_area) {
 386                 if (runtime->dma_bytes > size)
 387                         return 0;
 388
 389                 vfree(runtime->dma_area);
 390         }
 391         runtime->dma_area = vmalloc(size);
 392         if (!runtime->dma_area)
 393                 return -ENOMEM;
 394
 395         runtime->dma_bytes = size;
 396
 397         return 0;
 398 }
 399
 400 static struct snd_pcm_hardware snd_cx231xx_hw_capture = {
 401         .info = SNDRV_PCM_INFO_BLOCK_TRANSFER   |
 402             SNDRV_PCM_INFO_MMAP                 |
 403             SNDRV_PCM_INFO_INTERLEAVED          |
 404             SNDRV_PCM_INFO_MMAP_VALID,
 405
 406         .formats = SNDRV_PCM_FMTBIT_S16_LE,
 407
 408         .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_KNOT,
 409
 410         .rate_min = 48000,
 411         .rate_max = 48000,
 412         .channels_min = 2,
 413         .channels_max = 2,
 414         .buffer_bytes_max = 62720 * 8,  /* just about the value in usbaudio.c */
 415         .period_bytes_min = 64,         /* 12544/2, */
 416         .period_bytes_max = 12544,
 417         .periods_min = 2,
 418         .periods_max = 98,              /* 12544, */
 419 };
 420
 421 static int snd_cx231xx_capture_open(struct snd_pcm_substream *substream)
 422 {
 423         struct cx231xx *dev = snd_pcm_substream_chip(substream);
 424         struct snd_pcm_runtime *runtime = substream->runtime;
 425         int ret = 0;
 426
 427         dprintk("opening device and trying to acquire exclusive lock\n");
 428
 429         if (!dev) {
 430                 cx231xx_errdev("BUG: cx231xx can't find device struct."
 431                                " Can't proceed with open\n");
 432                 return -ENODEV;
 433         }
 434
 435         /* Sets volume, mute, etc */
 436         dev->mute = 0;
 437
 438         /* set alternate setting for audio interface */
 439         /* 1 - 48000 samples per sec */
 440         mutex_lock(&dev->lock);
 441         if (dev->USE_ISO)
 442                 ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 1);
 443         else
 444                 ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 0);
 445         mutex_unlock(&dev->lock);
 446         if (ret < 0) {
 447                 cx231xx_errdev("failed to set alternate setting !\n");
 448
 449                 return ret;
 450         }
 451
 452         runtime->hw = snd_cx231xx_hw_capture;
 453
 454         mutex_lock(&dev->lock);
 455         /* inform hardware to start streaming */
 456         ret = cx231xx_capture_start(dev, 1, Audio);
 457
 458         dev->adev.users++;
 459         mutex_unlock(&dev->lock);
 460
 461         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
 462         dev->adev.capture_pcm_substream = substream;
 463         runtime->private_data = dev;
 464
 465         return 0;
 466 }
 467
 468 static int snd_cx231xx_pcm_close(struct snd_pcm_substream *substream)
 469 {
 470         int ret;
 471         struct cx231xx *dev = snd_pcm_substream_chip(substream);
 472
 473         dprintk("closing device\n");
 474
 475         /* inform hardware to stop streaming */
 476         mutex_lock(&dev->lock);
 477         ret = cx231xx_capture_start(dev, 0, Audio);
 478
 479         /* set alternate setting for audio interface */
 480         /* 1 - 48000 samples per sec */
 481         ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 0);
 482         if (ret < 0) {
 483                 cx231xx_errdev("failed to set alternate setting !\n");
 484
 485                 mutex_unlock(&dev->lock);
 486                 return ret;
 487         }
 488
 489         dev->mute = 1;
 490         dev->adev.users--;
 491         mutex_unlock(&dev->lock);
 492
 493         if (dev->adev.users == 0 && dev->adev.shutdown == 1) {
 494                 dprintk("audio users: %d\n", dev->adev.users);
 495                 dprintk("disabling audio stream!\n");
 496                 dev->adev.shutdown = 0;
 497                 dprintk("released lock\n");
 498                 if (atomic_read(&dev->stream_started) > 0) {
 499                         atomic_set(&dev->stream_started, 0);
 500                         schedule_work(&dev->wq_trigger);
 501                 }
 502         }
 503         return 0;
 504 }
 505
 506 static int snd_cx231xx_hw_capture_params(struct snd_pcm_substream *substream,
 507                                          struct snd_pcm_hw_params *hw_params)
 508 {
 509         unsigned int channels, rate, format;
 510         int ret;
 511
 512         dprintk("Setting capture parameters\n");
 513
 514         ret = snd_pcm_alloc_vmalloc_buffer(substream,
 515                                            params_buffer_bytes(hw_params));
 516         format = params_format(hw_params);
 517         rate = params_rate(hw_params);
 518         channels = params_channels(hw_params);
 519
 520         /* TODO: set up cx231xx audio chip to deliver the correct audio format,
 521            current default is 48000hz multiplexed => 96000hz mono
 522            which shouldn't matter since analogue TV only supports mono */
 523         return 0;
 524 }
 525
 526 static int snd_cx231xx_hw_capture_free(struct snd_pcm_substream *substream)
 527 {
 528         struct cx231xx *dev = snd_pcm_substream_chip(substream);
 529
 530         dprintk("Stop capture, if needed\n");
 531
 532         if (atomic_read(&dev->stream_started) > 0) {
 533                 atomic_set(&dev->stream_started, 0);
 534                 schedule_work(&dev->wq_trigger);
 535         }
 536
 537         return 0;
 538 }
 539
 540 static int snd_cx231xx_prepare(struct snd_pcm_substream *substream)
 541 {
 542         struct cx231xx *dev = snd_pcm_substream_chip(substream);
 543
 544         dev->adev.hwptr_done_capture = 0;
 545         dev->adev.capture_transfer_done = 0;
 546
 547         return 0;
 548 }
 549
 550 static void audio_trigger(struct work_struct *work)
 551 {
 552         struct cx231xx *dev = container_of(work, struct cx231xx, wq_trigger);
 553
 554         if (atomic_read(&dev->stream_started)) {
 555                 dprintk("starting capture");
 556                 if (is_fw_load(dev) == 0)
 557                         cx25840_call(dev, core, load_fw);
 558                 if (dev->USE_ISO)
 559                         cx231xx_init_audio_isoc(dev);
 560                 else
 561                         cx231xx_init_audio_bulk(dev);
 562         } else {
 563                 dprintk("stopping capture");
 564                 cx231xx_isoc_audio_deinit(dev);
 565         }
 566 }
 567
 568 static int snd_cx231xx_capture_trigger(struct snd_pcm_substream *substream,
 569                                        int cmd)
 570 {
 571         struct cx231xx *dev = snd_pcm_substream_chip(substream);
 572         int retval;
 573
 574         spin_lock(&dev->adev.slock);
 575         switch (cmd) {
 576         case SNDRV_PCM_TRIGGER_START:
 577                 atomic_set(&dev->stream_started, 1);
 578                 break;
 579         case SNDRV_PCM_TRIGGER_STOP:
 580                 atomic_set(&dev->stream_started, 0);
 581                 break;
 582         default:
 583                 retval = -EINVAL;
 584         }
 585         spin_unlock(&dev->adev.slock);
 586
 587         schedule_work(&dev->wq_trigger);
 588
 589         return 0;
 590 }
 591
 592 static snd_pcm_uframes_t snd_cx231xx_capture_pointer(struct snd_pcm_substream
 593                                                      *substream)
 594 {
 595         struct cx231xx *dev;
 596         unsigned long flags;
 597         snd_pcm_uframes_t hwptr_done;
 598
 599         dev = snd_pcm_substream_chip(substream);
 600
 601         spin_lock_irqsave(&dev->adev.slock, flags);
 602         hwptr_done = dev->adev.hwptr_done_capture;
 603         spin_unlock_irqrestore(&dev->adev.slock, flags);
 604
 605         return hwptr_done;
 606 }
 607
 608 static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
 609                                              unsigned long offset)
 610 {
 611         void *pageptr = subs->runtime->dma_area + offset;
 612
 613         return vmalloc_to_page(pageptr);
 614 }
 615
 616 static struct snd_pcm_ops snd_cx231xx_pcm_capture = {
 617         .open = snd_cx231xx_capture_open,
 618         .close = snd_cx231xx_pcm_close,
 619         .ioctl = snd_pcm_lib_ioctl,
 620         .hw_params = snd_cx231xx_hw_capture_params,
 621         .hw_free = snd_cx231xx_hw_capture_free,
 622         .prepare = snd_cx231xx_prepare,
 623         .trigger = snd_cx231xx_capture_trigger,
 624         .pointer = snd_cx231xx_capture_pointer,
 625         .page = snd_pcm_get_vmalloc_page,
 626 };
 627
 628 static int cx231xx_audio_init(struct cx231xx *dev)
 629 {
 630         struct cx231xx_audio *adev = &dev->adev;
 631         struct snd_pcm *pcm;
 632         struct snd_card *card;
 633         static int devnr;
 634         int err;
 635         struct usb_interface *uif;
 636         int i, isoc_pipe = 0;
 637
 638         if (dev->has_alsa_audio != 1) {
 639                 /* This device does not support the extension (in this case
 640                    the device is expecting the snd-usb-audio module or
 641                    doesn't have analog audio support at all) */
 642                 return 0;
 643         }
 644
 645         cx231xx_info("cx231xx-audio.c: probing for cx231xx "
 646                      "non standard usbaudio\n");
 647
 648         err = snd_card_create(index[devnr], "Cx231xx Audio", THIS_MODULE,
 649                               0, &card);
 650         if (err < 0)
 651                 return err;
 652
 653         spin_lock_init(&adev->slock);
 654         err = snd_pcm_new(card, "Cx231xx Audio", 0, 0, 1, &pcm);
 655         if (err < 0) {
 656                 snd_card_free(card);
 657                 return err;
 658         }
 659
 660         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
 661                         &snd_cx231xx_pcm_capture);
 662         pcm->info_flags = 0;
 663         pcm->private_data = dev;
 664         strcpy(pcm->name, "Conexant cx231xx Capture");
 665         snd_card_set_dev(card, &dev->udev->dev);
 666         strcpy(card->driver, "Cx231xx-Audio");
 667         strcpy(card->shortname, "Cx231xx Audio");
 668         strcpy(card->longname, "Conexant cx231xx Audio");
 669
 670         INIT_WORK(&dev->wq_trigger, audio_trigger);
 671
 672         err = snd_card_register(card);
 673         if (err < 0) {
 674                 snd_card_free(card);
 675                 return err;
 676         }
 677         adev->sndcard = card;
 678         adev->udev = dev->udev;
 679
 680         /* compute alternate max packet sizes for Audio */
 681         uif =
 682             dev->udev->actconfig->interface[dev->current_pcb_config.
 683                                             hs_config_info[0].interface_info.
 684                                             audio_index + 1];
 685
 686         adev->end_point_addr =
 687             le16_to_cpu(uif->altsetting[0].endpoint[isoc_pipe].desc.
 688                         bEndpointAddress);
 689
 690         adev->num_alt = uif->num_altsetting;
 691         cx231xx_info("EndPoint Addr 0x%x, Alternate settings: %i\n",
 692                      adev->end_point_addr, adev->num_alt);
 693         adev->alt_max_pkt_size = kmalloc(32 * adev->num_alt, GFP_KERNEL);
 694
 695         if (adev->alt_max_pkt_size == NULL) {
 696                 cx231xx_errdev("out of memory!\n");
 697                 return -ENOMEM;
 698         }
 699
 700         for (i = 0; i < adev->num_alt; i++) {
 701                 u16 tmp =
 702                     le16_to_cpu(uif->altsetting[i].endpoint[isoc_pipe].desc.
 703                                 wMaxPacketSize);
 704                 adev->alt_max_pkt_size[i] =
 705                     (tmp & 0x07ff) * (((tmp & 0x1800) >> 11) + 1);
 706                 cx231xx_info("Alternate setting %i, max size= %i\n", i,
 707                              adev->alt_max_pkt_size[i]);
 708         }
 709
 710         return 0;
 711 }
 712
 713 static int cx231xx_audio_fini(struct cx231xx *dev)
 714 {
 715         if (dev == NULL)
 716                 return 0;
 717
 718         if (dev->has_alsa_audio != 1) {
 719                 /* This device does not support the extension (in this case
 720                    the device is expecting the snd-usb-audio module or
 721                    doesn't have analog audio support at all) */
 722                 return 0;
 723         }
 724
 725         if (dev->adev.sndcard) {
 726                 snd_card_free(dev->adev.sndcard);
 727                 kfree(dev->adev.alt_max_pkt_size);
 728                 dev->adev.sndcard = NULL;
 729         }
 730
 731         return 0;
 732 }
 733
 734 static struct cx231xx_ops audio_ops = {
 735         .id = CX231XX_AUDIO,
 736         .name = "Cx231xx Audio Extension",
 737         .init = cx231xx_audio_init,
 738         .fini = cx231xx_audio_fini,
 739 };
 740
 741 static int __init cx231xx_alsa_register(void)
 742 {
 743         return cx231xx_register_extension(&audio_ops);
 744 }
 745
 746 static void __exit cx231xx_alsa_unregister(void)
 747 {
 748         cx231xx_unregister_extension(&audio_ops);
 749 }
 750
 751 MODULE_LICENSE("GPL");
 752 MODULE_AUTHOR("Srinivasa Deevi <srinivasa.deevi@conexant.com>");
 753 MODULE_DESCRIPTION("Cx231xx Audio driver");
 754
 755 module_init(cx231xx_alsa_register);
 756 module_exit(cx231xx_alsa_unregister);