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 (dev->adev.capture_pcm_substream) {
 128                 substream = dev->adev.capture_pcm_substream;
 129                 runtime = substream->runtime;
 130                 stride = runtime->frame_bits >> 3;
 131
 132                 for (i = 0; i < urb->number_of_packets; i++) {
 133                         int length = urb->iso_frame_desc[i].actual_length /
 134                                      stride;
 135                         cp = (unsigned char *)urb->transfer_buffer +
 136                                               urb->iso_frame_desc[i].offset;
 137
 138                         if (!length)
 139                                 continue;
 140
 141                         oldptr = dev->adev.hwptr_done_capture;
 142                         if (oldptr + length >= runtime->buffer_size) {
 143                                 unsigned int cnt;
 144
 145                                 cnt = runtime->buffer_size - oldptr;
 146                                 memcpy(runtime->dma_area + oldptr * stride, cp,
 147                                        cnt * stride);
 148                                 memcpy(runtime->dma_area, cp + cnt * stride,
 149                                        length * stride - cnt * stride);
 150                         } else {
 151                                 memcpy(runtime->dma_area + oldptr * stride, cp,
 152                                        length * stride);
 153                         }
 154
 155                         snd_pcm_stream_lock(substream);
 156
 157                         dev->adev.hwptr_done_capture += length;
 158                         if (dev->adev.hwptr_done_capture >=
 159                                                 runtime->buffer_size)
 160                                 dev->adev.hwptr_done_capture -=
 161                                                 runtime->buffer_size;
 162
 163                         dev->adev.capture_transfer_done += length;
 164                         if (dev->adev.capture_transfer_done >=
 165                                 runtime->period_size) {
 166                                 dev->adev.capture_transfer_done -=
 167                                                 runtime->period_size;
 168                                 period_elapsed = 1;
 169                         }
 170                         snd_pcm_stream_unlock(substream);
 171                 }
 172                 if (period_elapsed)
 173                         snd_pcm_period_elapsed(substream);
 174         }
 175         urb->status = 0;
 176
 177         status = usb_submit_urb(urb, GFP_ATOMIC);
 178         if (status < 0) {
 179                 cx231xx_errdev("resubmit of audio urb failed (error=%i)\n",
 180                                status);
 181         }
 182         return;
 183 }
 184
 185 static void cx231xx_audio_bulkirq(struct urb *urb)
 186 {
 187         struct cx231xx *dev = urb->context;
 188         unsigned int oldptr;
 189         int period_elapsed = 0;
 190         int status;
 191         unsigned char *cp;
 192         unsigned int stride;
 193         struct snd_pcm_substream *substream;
 194         struct snd_pcm_runtime *runtime;
 195
 196         switch (urb->status) {
 197         case 0:         /* success */
 198         case -ETIMEDOUT:        /* NAK */
 199                 break;
 200         case -ECONNRESET:       /* kill */
 201         case -ENOENT:
 202         case -ESHUTDOWN:
 203                 return;
 204         default:                /* error */
 205                 dprintk("urb completition error %d.\n", urb->status);
 206                 break;
 207         }
 208
 209         if (dev->adev.capture_pcm_substream) {
 210                 substream = dev->adev.capture_pcm_substream;
 211                 runtime = substream->runtime;
 212                 stride = runtime->frame_bits >> 3;
 213
 214                 if (1) {
 215                         int length = urb->actual_length /
 216                                      stride;
 217                         cp = (unsigned char *)urb->transfer_buffer;
 218
 219                         oldptr = dev->adev.hwptr_done_capture;
 220                         if (oldptr + length >= runtime->buffer_size) {
 221                                 unsigned int cnt;
 222
 223                                 cnt = runtime->buffer_size - oldptr;
 224                                 memcpy(runtime->dma_area + oldptr * stride, cp,
 225                                        cnt * stride);
 226                                 memcpy(runtime->dma_area, cp + cnt * stride,
 227                                        length * stride - cnt * stride);
 228                         } else {
 229                                 memcpy(runtime->dma_area + oldptr * stride, cp,
 230                                        length * stride);
 231                         }
 232
 233                         snd_pcm_stream_lock(substream);
 234
 235                         dev->adev.hwptr_done_capture += length;
 236                         if (dev->adev.hwptr_done_capture >=
 237                                                 runtime->buffer_size)
 238                                 dev->adev.hwptr_done_capture -=
 239                                                 runtime->buffer_size;
 240
 241                         dev->adev.capture_transfer_done += length;
 242                         if (dev->adev.capture_transfer_done >=
 243                                 runtime->period_size) {
 244                                 dev->adev.capture_transfer_done -=
 245                                                 runtime->period_size;
 246                                 period_elapsed = 1;
 247                         }
 248                         snd_pcm_stream_unlock(substream);
 249                 }
 250                 if (period_elapsed)
 251                         snd_pcm_period_elapsed(substream);
 252         }
 253         urb->status = 0;
 254
 255         status = usb_submit_urb(urb, GFP_ATOMIC);
 256         if (status < 0) {
 257                 cx231xx_errdev("resubmit of audio urb failed (error=%i)\n",
 258                                status);
 259         }
 260         return;
 261 }
 262
 263 static int cx231xx_init_audio_isoc(struct cx231xx *dev)
 264 {
 265         int i, errCode;
 266         int sb_size;
 267
 268         cx231xx_info("%s: Starting ISO AUDIO transfers\n", __func__);
 269
 270         sb_size = CX231XX_ISO_NUM_AUDIO_PACKETS * dev->adev.max_pkt_size;
 271
 272         for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
 273                 struct urb *urb;
 274                 int j, k;
 275
 276                 dev->adev.transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC);
 277                 if (!dev->adev.transfer_buffer[i])
 278                         return -ENOMEM;
 279
 280                 memset(dev->adev.transfer_buffer[i], 0x80, sb_size);
 281                 urb = usb_alloc_urb(CX231XX_ISO_NUM_AUDIO_PACKETS, GFP_ATOMIC);
 282                 if (!urb) {
 283                         cx231xx_errdev("usb_alloc_urb failed!\n");
 284                         for (j = 0; j < i; j++) {
 285                                 usb_free_urb(dev->adev.urb[j]);
 286                                 kfree(dev->adev.transfer_buffer[j]);
 287                         }
 288                         return -ENOMEM;
 289                 }
 290
 291                 urb->dev = dev->udev;
 292                 urb->context = dev;
 293                 urb->pipe = usb_rcvisocpipe(dev->udev,
 294                                                 dev->adev.end_point_addr);
 295                 urb->transfer_flags = URB_ISO_ASAP;
 296                 urb->transfer_buffer = dev->adev.transfer_buffer[i];
 297                 urb->interval = 1;
 298                 urb->complete = cx231xx_audio_isocirq;
 299                 urb->number_of_packets = CX231XX_ISO_NUM_AUDIO_PACKETS;
 300                 urb->transfer_buffer_length = sb_size;
 301
 302                 for (j = k = 0; j < CX231XX_ISO_NUM_AUDIO_PACKETS;
 303                         j++, k += dev->adev.max_pkt_size) {
 304                         urb->iso_frame_desc[j].offset = k;
 305                         urb->iso_frame_desc[j].length = dev->adev.max_pkt_size;
 306                 }
 307                 dev->adev.urb[i] = urb;
 308         }
 309
 310         for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
 311                 errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC);
 312                 if (errCode < 0) {
 313                         cx231xx_isoc_audio_deinit(dev);
 314                         return errCode;
 315                 }
 316         }
 317
 318         return errCode;
 319 }
 320
 321 static int cx231xx_init_audio_bulk(struct cx231xx *dev)
 322 {
 323         int i, errCode;
 324         int sb_size;
 325
 326         cx231xx_info("%s: Starting BULK AUDIO transfers\n", __func__);
 327
 328         sb_size = CX231XX_NUM_AUDIO_PACKETS * dev->adev.max_pkt_size;
 329
 330         for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
 331                 struct urb *urb;
 332                 int j;
 333
 334                 dev->adev.transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC);
 335                 if (!dev->adev.transfer_buffer[i])
 336                         return -ENOMEM;
 337
 338                 memset(dev->adev.transfer_buffer[i], 0x80, sb_size);
 339                 urb = usb_alloc_urb(CX231XX_NUM_AUDIO_PACKETS, GFP_ATOMIC);
 340                 if (!urb) {
 341                         cx231xx_errdev("usb_alloc_urb failed!\n");
 342                         for (j = 0; j < i; j++) {
 343                                 usb_free_urb(dev->adev.urb[j]);
 344                                 kfree(dev->adev.transfer_buffer[j]);
 345                         }
 346                         return -ENOMEM;
 347                 }
 348
 349                 urb->dev = dev->udev;
 350                 urb->context = dev;
 351                 urb->pipe = usb_rcvbulkpipe(dev->udev,
 352                                                 dev->adev.end_point_addr);
 353                 urb->transfer_flags = 0;
 354                 urb->transfer_buffer = dev->adev.transfer_buffer[i];
 355                 urb->complete = cx231xx_audio_bulkirq;
 356                 urb->transfer_buffer_length = sb_size;
 357
 358                 dev->adev.urb[i] = urb;
 359
 360         }
 361
 362         for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
 363                 errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC);
 364                 if (errCode < 0) {
 365                         cx231xx_bulk_audio_deinit(dev);
 366                         return errCode;
 367                 }
 368         }
 369
 370         return errCode;
 371 }
 372
 373
 374 static int cx231xx_cmd(struct cx231xx *dev, int cmd, int arg)
 375 {
 376         dprintk("%s transfer\n", (dev->adev.capture_stream == STREAM_ON) ?
 377                 "stop" : "start");
 378
 379         switch (cmd) {
 380         case CX231XX_CAPTURE_STREAM_EN:
 381                 if (dev->adev.capture_stream == STREAM_OFF && arg == 1) {
 382                         dev->adev.capture_stream = STREAM_ON;
 383                         if (is_fw_load(dev) == 0)
 384                                 cx25840_call(dev, core, load_fw);
 385                         if (dev->USE_ISO)
 386                                 cx231xx_init_audio_isoc(dev);
 387                         else
 388                                 cx231xx_init_audio_bulk(dev);
 389                 } else if (dev->adev.capture_stream == STREAM_ON && arg == 0) {
 390                         dev->adev.capture_stream = STREAM_OFF;
 391                         cx231xx_isoc_audio_deinit(dev);
 392                 } else {
 393                         cx231xx_errdev("An underrun very likely occurred. "
 394                                        "Ignoring it.\n");
 395                 }
 396                 return 0;
 397         default:
 398                 return -EINVAL;
 399         }
 400 }
 401
 402 static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
 403                                         size_t size)
 404 {
 405         struct snd_pcm_runtime *runtime = subs->runtime;
 406
 407         dprintk("Allocating vbuffer\n");
 408         if (runtime->dma_area) {
 409                 if (runtime->dma_bytes > size)
 410                         return 0;
 411
 412                 vfree(runtime->dma_area);
 413         }
 414         runtime->dma_area = vmalloc(size);
 415         if (!runtime->dma_area)
 416                 return -ENOMEM;
 417
 418         runtime->dma_bytes = size;
 419
 420         return 0;
 421 }
 422
 423 static struct snd_pcm_hardware snd_cx231xx_hw_capture = {
 424         .info = SNDRV_PCM_INFO_BLOCK_TRANSFER   |
 425             SNDRV_PCM_INFO_MMAP                 |
 426             SNDRV_PCM_INFO_INTERLEAVED          |
 427             SNDRV_PCM_INFO_MMAP_VALID,
 428
 429         .formats = SNDRV_PCM_FMTBIT_S16_LE,
 430
 431         .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_KNOT,
 432
 433         .rate_min = 48000,
 434         .rate_max = 48000,
 435         .channels_min = 2,
 436         .channels_max = 2,
 437         .buffer_bytes_max = 62720 * 8,  /* just about the value in usbaudio.c */
 438         .period_bytes_min = 64,         /* 12544/2, */
 439         .period_bytes_max = 12544,
 440         .periods_min = 2,
 441         .periods_max = 98,              /* 12544, */
 442 };
 443
 444 static int snd_cx231xx_capture_open(struct snd_pcm_substream *substream)
 445 {
 446         struct cx231xx *dev = snd_pcm_substream_chip(substream);
 447         struct snd_pcm_runtime *runtime = substream->runtime;
 448         int ret = 0;
 449
 450         dprintk("opening device and trying to acquire exclusive lock\n");
 451
 452         if (!dev) {
 453                 cx231xx_errdev("BUG: cx231xx can't find device struct."
 454                                " Can't proceed with open\n");
 455                 return -ENODEV;
 456         }
 457
 458         /* Sets volume, mute, etc */
 459         dev->mute = 0;
 460
 461         /* set alternate setting for audio interface */
 462         /* 1 - 48000 samples per sec */
 463         if (dev->USE_ISO)
 464                 ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 1);
 465         else
 466                 ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 0);
 467         if (ret < 0) {
 468                 cx231xx_errdev("failed to set alternate setting !\n");
 469
 470                 return ret;
 471         }
 472
 473         /* inform hardware to start streaming */
 474         ret = cx231xx_capture_start(dev, 1, Audio);
 475
 476         runtime->hw = snd_cx231xx_hw_capture;
 477
 478         mutex_lock(&dev->lock);
 479         dev->adev.users++;
 480         mutex_unlock(&dev->lock);
 481
 482         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
 483         dev->adev.capture_pcm_substream = substream;
 484         runtime->private_data = dev;
 485
 486         return 0;
 487 }
 488
 489 static int snd_cx231xx_pcm_close(struct snd_pcm_substream *substream)
 490 {
 491         int ret;
 492         struct cx231xx *dev = snd_pcm_substream_chip(substream);
 493
 494         dprintk("closing device\n");
 495
 496         /* inform hardware to start streaming */
 497         ret = cx231xx_capture_start(dev, 0, Audio);
 498
 499         /* set alternate setting for audio interface */
 500         /* 1 - 48000 samples per sec */
 501         ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 0);
 502         if (ret < 0) {
 503                 cx231xx_errdev("failed to set alternate setting !\n");
 504
 505                 return ret;
 506         }
 507
 508         dev->mute = 1;
 509         mutex_lock(&dev->lock);
 510         dev->adev.users--;
 511         mutex_unlock(&dev->lock);
 512
 513         if (dev->adev.users == 0 && dev->adev.shutdown == 1) {
 514                 dprintk("audio users: %d\n", dev->adev.users);
 515                 dprintk("disabling audio stream!\n");
 516                 dev->adev.shutdown = 0;
 517                 dprintk("released lock\n");
 518                 cx231xx_cmd(dev, CX231XX_CAPTURE_STREAM_EN, 0);
 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 (dev->adev.capture_stream == STREAM_ON)
 550                 cx231xx_cmd(dev, CX231XX_CAPTURE_STREAM_EN, CX231XX_STOP_AUDIO);
 551
 552         return 0;
 553 }
 554
 555 static int snd_cx231xx_prepare(struct snd_pcm_substream *substream)
 556 {
 557         struct cx231xx *dev = snd_pcm_substream_chip(substream);
 558
 559         dev->adev.hwptr_done_capture = 0;
 560         dev->adev.capture_transfer_done = 0;
 561
 562         return 0;
 563 }
 564
 565 static int snd_cx231xx_capture_trigger(struct snd_pcm_substream *substream,
 566                                        int cmd)
 567 {
 568         struct cx231xx *dev = snd_pcm_substream_chip(substream);
 569         int retval;
 570
 571         dprintk("Should %s capture\n", (cmd == SNDRV_PCM_TRIGGER_START) ?
 572                 "start" : "stop");
 573
 574         spin_lock(&dev->adev.slock);
 575         switch (cmd) {
 576         case SNDRV_PCM_TRIGGER_START:
 577                 cx231xx_cmd(dev, CX231XX_CAPTURE_STREAM_EN,
 578                             CX231XX_START_AUDIO);
 579                 retval = 0;
 580                 break;
 581         case SNDRV_PCM_TRIGGER_STOP:
 582                 cx231xx_cmd(dev, CX231XX_CAPTURE_STREAM_EN, CX231XX_STOP_AUDIO);
 583                 retval = 0;
 584                 break;
 585         default:
 586                 retval = -EINVAL;
 587         }
 588
 589         spin_unlock(&dev->adev.slock);
 590         return retval;
 591 }
 592
 593 static snd_pcm_uframes_t snd_cx231xx_capture_pointer(struct snd_pcm_substream
 594                                                      *substream)
 595 {
 596         struct cx231xx *dev;
 597         unsigned long flags;
 598         snd_pcm_uframes_t hwptr_done;
 599
 600         dev = snd_pcm_substream_chip(substream);
 601
 602         spin_lock_irqsave(&dev->adev.slock, flags);
 603         hwptr_done = dev->adev.hwptr_done_capture;
 604         spin_unlock_irqrestore(&dev->adev.slock, flags);
 605
 606         return hwptr_done;
 607 }
 608
 609 static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
 610                                              unsigned long offset)
 611 {
 612         void *pageptr = subs->runtime->dma_area + offset;
 613
 614         return vmalloc_to_page(pageptr);
 615 }
 616
 617 static struct snd_pcm_ops snd_cx231xx_pcm_capture = {
 618         .open = snd_cx231xx_capture_open,
 619         .close = snd_cx231xx_pcm_close,
 620         .ioctl = snd_pcm_lib_ioctl,
 621         .hw_params = snd_cx231xx_hw_capture_params,
 622         .hw_free = snd_cx231xx_hw_capture_free,
 623         .prepare = snd_cx231xx_prepare,
 624         .trigger = snd_cx231xx_capture_trigger,
 625         .pointer = snd_cx231xx_capture_pointer,
 626         .page = snd_pcm_get_vmalloc_page,
 627 };
 628
 629 static int cx231xx_audio_init(struct cx231xx *dev)
 630 {
 631         struct cx231xx_audio *adev = &dev->adev;
 632         struct snd_pcm *pcm;
 633         struct snd_card *card;
 634         static int devnr;
 635         int err;
 636         struct usb_interface *uif;
 637         int i, isoc_pipe = 0;
 638
 639         if (dev->has_alsa_audio != 1) {
 640                 /* This device does not support the extension (in this case
 641                    the device is expecting the snd-usb-audio module or
 642                    doesn't have analog audio support at all) */
 643                 return 0;
 644         }
 645
 646         cx231xx_info("cx231xx-audio.c: probing for cx231xx "
 647                      "non standard usbaudio\n");
 648
 649         err = snd_card_create(index[devnr], "Cx231xx Audio", THIS_MODULE,
 650                               0, &card);
 651         if (err < 0)
 652                 return err;
 653
 654         spin_lock_init(&adev->slock);
 655         err = snd_pcm_new(card, "Cx231xx Audio", 0, 0, 1, &pcm);
 656         if (err < 0) {
 657                 snd_card_free(card);
 658                 return err;
 659         }
 660
 661         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
 662                         &snd_cx231xx_pcm_capture);
 663         pcm->info_flags = 0;
 664         pcm->private_data = dev;
 665         strcpy(pcm->name, "Conexant cx231xx Capture");
 666         snd_card_set_dev(card, &dev->udev->dev);
 667         strcpy(card->driver, "Cx231xx-Audio");
 668         strcpy(card->shortname, "Cx231xx Audio");
 669         strcpy(card->longname, "Conexant cx231xx Audio");
 670
 671         err = snd_card_register(card);
 672         if (err < 0) {
 673                 snd_card_free(card);
 674                 return err;
 675         }
 676         adev->sndcard = card;
 677         adev->udev = dev->udev;
 678
 679         /* compute alternate max packet sizes for Audio */
 680         uif =
 681             dev->udev->actconfig->interface[dev->current_pcb_config.
 682                                             hs_config_info[0].interface_info.
 683                                             audio_index + 1];
 684
 685         adev->end_point_addr =
 686             le16_to_cpu(uif->altsetting[0].endpoint[isoc_pipe].desc.
 687                         bEndpointAddress);
 688
 689         adev->num_alt = uif->num_altsetting;
 690         cx231xx_info("EndPoint Addr 0x%x, Alternate settings: %i\n",
 691                      adev->end_point_addr, adev->num_alt);
 692         adev->alt_max_pkt_size = kmalloc(32 * adev->num_alt, GFP_KERNEL);
 693
 694         if (adev->alt_max_pkt_size == NULL) {
 695                 cx231xx_errdev("out of memory!\n");
 696                 return -ENOMEM;
 697         }
 698
 699         for (i = 0; i < adev->num_alt; i++) {
 700                 u16 tmp =
 701                     le16_to_cpu(uif->altsetting[i].endpoint[isoc_pipe].desc.
 702                                 wMaxPacketSize);
 703                 adev->alt_max_pkt_size[i] =
 704                     (tmp & 0x07ff) * (((tmp & 0x1800) >> 11) + 1);
 705                 cx231xx_info("Alternate setting %i, max size= %i\n", i,
 706                              adev->alt_max_pkt_size[i]);
 707         }
 708
 709         return 0;
 710 }
 711
 712 static int cx231xx_audio_fini(struct cx231xx *dev)
 713 {
 714         if (dev == NULL)
 715                 return 0;
 716
 717         if (dev->has_alsa_audio != 1) {
 718                 /* This device does not support the extension (in this case
 719                    the device is expecting the snd-usb-audio module or
 720                    doesn't have analog audio support at all) */
 721                 return 0;
 722         }
 723
 724         if (dev->adev.sndcard) {
 725                 snd_card_free(dev->adev.sndcard);
 726                 kfree(dev->adev.alt_max_pkt_size);
 727                 dev->adev.sndcard = NULL;
 728         }
 729
 730         return 0;
 731 }
 732
 733 static struct cx231xx_ops audio_ops = {
 734         .id = CX231XX_AUDIO,
 735         .name = "Cx231xx Audio Extension",
 736         .init = cx231xx_audio_init,
 737         .fini = cx231xx_audio_fini,
 738 };
 739
 740 static int __init cx231xx_alsa_register(void)
 741 {
 742         return cx231xx_register_extension(&audio_ops);
 743 }
 744
 745 static void __exit cx231xx_alsa_unregister(void)
 746 {
 747         cx231xx_unregister_extension(&audio_ops);
 748 }
 749
 750 MODULE_LICENSE("GPL");
 751 MODULE_AUTHOR("Srinivasa Deevi <srinivasa.deevi@conexant.com>");
 752 MODULE_DESCRIPTION("Cx231xx Audio driver");
 753
 754 module_init(cx231xx_alsa_register);
 755 module_exit(cx231xx_alsa_unregister);