drivers/media/usb/cx231xx/cx231xx-audio.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Conexant Cx231xx audio extension
   4  *
   5  *  Copyright (C) 2008 <srinivasa.deevi at conexant dot com>
   6  *       Based on em28xx driver
   7  */
   8
   9 #include "cx231xx.h"
  10 #include <linux/kernel.h>
  11 #include <linux/init.h>
  12 #include <linux/sound.h>
  13 #include <linux/spinlock.h>
  14 #include <linux/soundcard.h>
  15 #include <linux/slab.h>
  16 #include <linux/module.h>
  17 #include <sound/core.h>
  18 #include <sound/pcm.h>
  19 #include <sound/pcm_params.h>
  20 #include <sound/info.h>
  21 #include <sound/initval.h>
  22 #include <sound/control.h>
  23 #include <media/v4l2-common.h>
  24
  25 static int debug;
  26 module_param(debug, int, 0644);
  27 MODULE_PARM_DESC(debug, "activates debug info");
  28
  29 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
  30
  31 static int cx231xx_isoc_audio_deinit(struct cx231xx *dev)
  32 {
  33         int i;
  34
  35         dev_dbg(dev->dev, "Stopping isoc\n");
  36
  37         for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
  38                 if (dev->adev.urb[i]) {
  39                         if (!irqs_disabled())
  40                                 usb_kill_urb(dev->adev.urb[i]);
  41                         else
  42                                 usb_unlink_urb(dev->adev.urb[i]);
  43
  44                         usb_free_urb(dev->adev.urb[i]);
  45                         dev->adev.urb[i] = NULL;
  46
  47                         kfree(dev->adev.transfer_buffer[i]);
  48                         dev->adev.transfer_buffer[i] = NULL;
  49                 }
  50         }
  51
  52         return 0;
  53 }
  54
  55 static int cx231xx_bulk_audio_deinit(struct cx231xx *dev)
  56 {
  57         int i;
  58
  59         dev_dbg(dev->dev, "Stopping bulk\n");
  60
  61         for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
  62                 if (dev->adev.urb[i]) {
  63                         if (!irqs_disabled())
  64                                 usb_kill_urb(dev->adev.urb[i]);
  65                         else
  66                                 usb_unlink_urb(dev->adev.urb[i]);
  67
  68                         usb_free_urb(dev->adev.urb[i]);
  69                         dev->adev.urb[i] = NULL;
  70
  71                         kfree(dev->adev.transfer_buffer[i]);
  72                         dev->adev.transfer_buffer[i] = NULL;
  73                 }
  74         }
  75
  76         return 0;
  77 }
  78
  79 static void cx231xx_audio_isocirq(struct urb *urb)
  80 {
  81         struct cx231xx *dev = urb->context;
  82         int i;
  83         unsigned int oldptr;
  84         int period_elapsed = 0;
  85         int status;
  86         unsigned char *cp;
  87         unsigned int stride;
  88         struct snd_pcm_substream *substream;
  89         struct snd_pcm_runtime *runtime;
  90
  91         if (dev->state & DEV_DISCONNECTED)
  92                 return;
  93
  94         switch (urb->status) {
  95         case 0:         /* success */
  96         case -ETIMEDOUT:        /* NAK */
  97                 break;
  98         case -ECONNRESET:       /* kill */
  99         case -ENOENT:
 100         case -ESHUTDOWN:
 101                 return;
 102         default:                /* error */
 103                 dev_dbg(dev->dev, "urb completion error %d.\n",
 104                         urb->status);
 105                 break;
 106         }
 107
 108         if (atomic_read(&dev->stream_started) == 0)
 109                 return;
 110
 111         if (dev->adev.capture_pcm_substream) {
 112                 substream = dev->adev.capture_pcm_substream;
 113                 runtime = substream->runtime;
 114                 stride = runtime->frame_bits >> 3;
 115
 116                 for (i = 0; i < urb->number_of_packets; i++) {
 117                         unsigned long flags;
 118                         int length = urb->iso_frame_desc[i].actual_length /
 119                                      stride;
 120                         cp = (unsigned char *)urb->transfer_buffer +
 121                                               urb->iso_frame_desc[i].offset;
 122
 123                         if (!length)
 124                                 continue;
 125
 126                         oldptr = dev->adev.hwptr_done_capture;
 127                         if (oldptr + length >= runtime->buffer_size) {
 128                                 unsigned int cnt;
 129
 130                                 cnt = runtime->buffer_size - oldptr;
 131                                 memcpy(runtime->dma_area + oldptr * stride, cp,
 132                                        cnt * stride);
 133                                 memcpy(runtime->dma_area, cp + cnt * stride,
 134                                        length * stride - cnt * stride);
 135                         } else {
 136                                 memcpy(runtime->dma_area + oldptr * stride, cp,
 137                                        length * stride);
 138                         }
 139
 140                         snd_pcm_stream_lock_irqsave(substream, flags);
 141
 142                         dev->adev.hwptr_done_capture += length;
 143                         if (dev->adev.hwptr_done_capture >=
 144                                                 runtime->buffer_size)
 145                                 dev->adev.hwptr_done_capture -=
 146                                                 runtime->buffer_size;
 147
 148                         dev->adev.capture_transfer_done += length;
 149                         if (dev->adev.capture_transfer_done >=
 150                                 runtime->period_size) {
 151                                 dev->adev.capture_transfer_done -=
 152                                                 runtime->period_size;
 153                                 period_elapsed = 1;
 154                         }
 155                         snd_pcm_stream_unlock_irqrestore(substream, flags);
 156                 }
 157                 if (period_elapsed)
 158                         snd_pcm_period_elapsed(substream);
 159         }
 160         urb->status = 0;
 161
 162         status = usb_submit_urb(urb, GFP_ATOMIC);
 163         if (status < 0) {
 164                 dev_err(dev->dev,
 165                         "resubmit of audio urb failed (error=%i)\n",
 166                         status);
 167         }
 168         return;
 169 }
 170
 171 static void cx231xx_audio_bulkirq(struct urb *urb)
 172 {
 173         struct cx231xx *dev = urb->context;
 174         unsigned int oldptr;
 175         int period_elapsed = 0;
 176         int status;
 177         unsigned char *cp;
 178         unsigned int stride;
 179         struct snd_pcm_substream *substream;
 180         struct snd_pcm_runtime *runtime;
 181
 182         if (dev->state & DEV_DISCONNECTED)
 183                 return;
 184
 185         switch (urb->status) {
 186         case 0:         /* success */
 187         case -ETIMEDOUT:        /* NAK */
 188                 break;
 189         case -ECONNRESET:       /* kill */
 190         case -ENOENT:
 191         case -ESHUTDOWN:
 192                 return;
 193         default:                /* error */
 194                 dev_dbg(dev->dev, "urb completion error %d.\n",
 195                         urb->status);
 196                 break;
 197         }
 198
 199         if (atomic_read(&dev->stream_started) == 0)
 200                 return;
 201
 202         if (dev->adev.capture_pcm_substream) {
 203                 substream = dev->adev.capture_pcm_substream;
 204                 runtime = substream->runtime;
 205                 stride = runtime->frame_bits >> 3;
 206
 207                 if (1) {
 208                         unsigned long flags;
 209                         int length = urb->actual_length /
 210                                      stride;
 211                         cp = (unsigned char *)urb->transfer_buffer;
 212
 213                         oldptr = dev->adev.hwptr_done_capture;
 214                         if (oldptr + length >= runtime->buffer_size) {
 215                                 unsigned int cnt;
 216
 217                                 cnt = runtime->buffer_size - oldptr;
 218                                 memcpy(runtime->dma_area + oldptr * stride, cp,
 219                                        cnt * stride);
 220                                 memcpy(runtime->dma_area, cp + cnt * stride,
 221                                        length * stride - cnt * stride);
 222                         } else {
 223                                 memcpy(runtime->dma_area + oldptr * stride, cp,
 224                                        length * stride);
 225                         }
 226
 227                         snd_pcm_stream_lock_irqsave(substream, flags);
 228
 229                         dev->adev.hwptr_done_capture += length;
 230                         if (dev->adev.hwptr_done_capture >=
 231                                                 runtime->buffer_size)
 232                                 dev->adev.hwptr_done_capture -=
 233                                                 runtime->buffer_size;
 234
 235                         dev->adev.capture_transfer_done += length;
 236                         if (dev->adev.capture_transfer_done >=
 237                                 runtime->period_size) {
 238                                 dev->adev.capture_transfer_done -=
 239                                                 runtime->period_size;
 240                                 period_elapsed = 1;
 241                         }
 242                         snd_pcm_stream_unlock_irqrestore(substream, flags);
 243                 }
 244                 if (period_elapsed)
 245                         snd_pcm_period_elapsed(substream);
 246         }
 247         urb->status = 0;
 248
 249         status = usb_submit_urb(urb, GFP_ATOMIC);
 250         if (status < 0) {
 251                 dev_err(dev->dev,
 252                         "resubmit of audio urb failed (error=%i)\n",
 253                         status);
 254         }
 255         return;
 256 }
 257
 258 static int cx231xx_init_audio_isoc(struct cx231xx *dev)
 259 {
 260         int i, errCode;
 261         int sb_size;
 262
 263         dev_dbg(dev->dev,
 264                 "%s: Starting ISO AUDIO transfers\n", __func__);
 265
 266         if (dev->state & DEV_DISCONNECTED)
 267                 return -ENODEV;
 268
 269         sb_size = CX231XX_ISO_NUM_AUDIO_PACKETS * dev->adev.max_pkt_size;
 270
 271         for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
 272                 struct urb *urb;
 273                 int j, k;
 274
 275                 dev->adev.transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC);
 276                 if (!dev->adev.transfer_buffer[i])
 277                         return -ENOMEM;
 278
 279                 memset(dev->adev.transfer_buffer[i], 0x80, sb_size);
 280                 urb = usb_alloc_urb(CX231XX_ISO_NUM_AUDIO_PACKETS, GFP_ATOMIC);
 281                 if (!urb) {
 282                         for (j = 0; j < i; j++) {
 283                                 usb_free_urb(dev->adev.urb[j]);
 284                                 kfree(dev->adev.transfer_buffer[j]);
 285                         }
 286                         return -ENOMEM;
 287                 }
 288
 289                 urb->dev = dev->udev;
 290                 urb->context = dev;
 291                 urb->pipe = usb_rcvisocpipe(dev->udev,
 292                                                 dev->adev.end_point_addr);
 293                 urb->transfer_flags = URB_ISO_ASAP;
 294                 urb->transfer_buffer = dev->adev.transfer_buffer[i];
 295                 urb->interval = 1;
 296                 urb->complete = cx231xx_audio_isocirq;
 297                 urb->number_of_packets = CX231XX_ISO_NUM_AUDIO_PACKETS;
 298                 urb->transfer_buffer_length = sb_size;
 299
 300                 for (j = k = 0; j < CX231XX_ISO_NUM_AUDIO_PACKETS;
 301                         j++, k += dev->adev.max_pkt_size) {
 302                         urb->iso_frame_desc[j].offset = k;
 303                         urb->iso_frame_desc[j].length = dev->adev.max_pkt_size;
 304                 }
 305                 dev->adev.urb[i] = urb;
 306         }
 307
 308         for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
 309                 errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC);
 310                 if (errCode < 0) {
 311                         cx231xx_isoc_audio_deinit(dev);
 312                         return errCode;
 313                 }
 314         }
 315
 316         return errCode;
 317 }
 318
 319 static int cx231xx_init_audio_bulk(struct cx231xx *dev)
 320 {
 321         int i, errCode;
 322         int sb_size;
 323
 324         dev_dbg(dev->dev,
 325                 "%s: Starting BULK AUDIO transfers\n", __func__);
 326
 327         if (dev->state & DEV_DISCONNECTED)
 328                 return -ENODEV;
 329
 330         sb_size = CX231XX_NUM_AUDIO_PACKETS * dev->adev.max_pkt_size;
 331
 332         for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
 333                 struct urb *urb;
 334                 int j;
 335
 336                 dev->adev.transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC);
 337                 if (!dev->adev.transfer_buffer[i])
 338                         return -ENOMEM;
 339
 340                 memset(dev->adev.transfer_buffer[i], 0x80, sb_size);
 341                 urb = usb_alloc_urb(CX231XX_NUM_AUDIO_PACKETS, GFP_ATOMIC);
 342                 if (!urb) {
 343                         for (j = 0; j < i; j++) {
 344                                 usb_free_urb(dev->adev.urb[j]);
 345                                 kfree(dev->adev.transfer_buffer[j]);
 346                         }
 347                         return -ENOMEM;
 348                 }
 349
 350                 urb->dev = dev->udev;
 351                 urb->context = dev;
 352                 urb->pipe = usb_rcvbulkpipe(dev->udev,
 353                                                 dev->adev.end_point_addr);
 354                 urb->transfer_flags = 0;
 355                 urb->transfer_buffer = dev->adev.transfer_buffer[i];
 356                 urb->complete = cx231xx_audio_bulkirq;
 357                 urb->transfer_buffer_length = sb_size;
 358
 359                 dev->adev.urb[i] = urb;
 360
 361         }
 362
 363         for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
 364                 errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC);
 365                 if (errCode < 0) {
 366                         cx231xx_bulk_audio_deinit(dev);
 367                         return errCode;
 368                 }
 369         }
 370
 371         return errCode;
 372 }
 373
 374 static const struct snd_pcm_hardware snd_cx231xx_hw_capture = {
 375         .info = SNDRV_PCM_INFO_BLOCK_TRANSFER   |
 376             SNDRV_PCM_INFO_MMAP                 |
 377             SNDRV_PCM_INFO_INTERLEAVED          |
 378             SNDRV_PCM_INFO_MMAP_VALID,
 379
 380         .formats = SNDRV_PCM_FMTBIT_S16_LE,
 381
 382         .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_KNOT,
 383
 384         .rate_min = 48000,
 385         .rate_max = 48000,
 386         .channels_min = 2,
 387         .channels_max = 2,
 388         .buffer_bytes_max = 62720 * 8,  /* just about the value in usbaudio.c */
 389         .period_bytes_min = 64,         /* 12544/2, */
 390         .period_bytes_max = 12544,
 391         .periods_min = 2,
 392         .periods_max = 98,              /* 12544, */
 393 };
 394
 395 static int snd_cx231xx_capture_open(struct snd_pcm_substream *substream)
 396 {
 397         struct cx231xx *dev = snd_pcm_substream_chip(substream);
 398         struct snd_pcm_runtime *runtime = substream->runtime;
 399         int ret = 0;
 400
 401         dev_dbg(dev->dev,
 402                 "opening device and trying to acquire exclusive lock\n");
 403
 404         if (dev->state & DEV_DISCONNECTED) {
 405                 dev_err(dev->dev,
 406                         "Can't open. the device was removed.\n");
 407                 return -ENODEV;
 408         }
 409
 410         /* set alternate setting for audio interface */
 411         /* 1 - 48000 samples per sec */
 412         mutex_lock(&dev->lock);
 413         if (dev->USE_ISO)
 414                 ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 1);
 415         else
 416                 ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 0);
 417         mutex_unlock(&dev->lock);
 418         if (ret < 0) {
 419                 dev_err(dev->dev,
 420                         "failed to set alternate setting !\n");
 421
 422                 return ret;
 423         }
 424
 425         runtime->hw = snd_cx231xx_hw_capture;
 426
 427         mutex_lock(&dev->lock);
 428         /* inform hardware to start streaming */
 429         ret = cx231xx_capture_start(dev, 1, Audio);
 430
 431         dev->adev.users++;
 432         mutex_unlock(&dev->lock);
 433
 434         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
 435         dev->adev.capture_pcm_substream = substream;
 436         runtime->private_data = dev;
 437
 438         return 0;
 439 }
 440
 441 static int snd_cx231xx_pcm_close(struct snd_pcm_substream *substream)
 442 {
 443         int ret;
 444         struct cx231xx *dev = snd_pcm_substream_chip(substream);
 445
 446         dev_dbg(dev->dev, "closing device\n");
 447
 448         /* inform hardware to stop streaming */
 449         mutex_lock(&dev->lock);
 450         ret = cx231xx_capture_start(dev, 0, Audio);
 451
 452         /* set alternate setting for audio interface */
 453         /* 1 - 48000 samples per sec */
 454         ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 0);
 455         if (ret < 0) {
 456                 dev_err(dev->dev,
 457                         "failed to set alternate setting !\n");
 458
 459                 mutex_unlock(&dev->lock);
 460                 return ret;
 461         }
 462
 463         dev->adev.users--;
 464         mutex_unlock(&dev->lock);
 465
 466         if (dev->adev.users == 0 && dev->adev.shutdown == 1) {
 467                 dev_dbg(dev->dev, "audio users: %d\n", dev->adev.users);
 468                 dev_dbg(dev->dev, "disabling audio stream!\n");
 469                 dev->adev.shutdown = 0;
 470                 dev_dbg(dev->dev, "released lock\n");
 471                 if (atomic_read(&dev->stream_started) > 0) {
 472                         atomic_set(&dev->stream_started, 0);
 473                         schedule_work(&dev->wq_trigger);
 474                 }
 475         }
 476         return 0;
 477 }
 478
 479 static int snd_cx231xx_prepare(struct snd_pcm_substream *substream)
 480 {
 481         struct cx231xx *dev = snd_pcm_substream_chip(substream);
 482
 483         dev->adev.hwptr_done_capture = 0;
 484         dev->adev.capture_transfer_done = 0;
 485
 486         return 0;
 487 }
 488
 489 static void audio_trigger(struct work_struct *work)
 490 {
 491         struct cx231xx *dev = container_of(work, struct cx231xx, wq_trigger);
 492
 493         if (atomic_read(&dev->stream_started)) {
 494                 dev_dbg(dev->dev, "starting capture");
 495                 if (is_fw_load(dev) == 0)
 496                         cx25840_call(dev, core, load_fw);
 497                 if (dev->USE_ISO)
 498                         cx231xx_init_audio_isoc(dev);
 499                 else
 500                         cx231xx_init_audio_bulk(dev);
 501         } else {
 502                 dev_dbg(dev->dev, "stopping capture");
 503                 cx231xx_isoc_audio_deinit(dev);
 504         }
 505 }
 506
 507 static int snd_cx231xx_capture_trigger(struct snd_pcm_substream *substream,
 508                                        int cmd)
 509 {
 510         struct cx231xx *dev = snd_pcm_substream_chip(substream);
 511         int retval = 0;
 512
 513         if (dev->state & DEV_DISCONNECTED)
 514                 return -ENODEV;
 515
 516         spin_lock(&dev->adev.slock);
 517         switch (cmd) {
 518         case SNDRV_PCM_TRIGGER_START:
 519                 atomic_set(&dev->stream_started, 1);
 520                 break;
 521         case SNDRV_PCM_TRIGGER_STOP:
 522                 atomic_set(&dev->stream_started, 0);
 523                 break;
 524         default:
 525                 retval = -EINVAL;
 526                 break;
 527         }
 528         spin_unlock(&dev->adev.slock);
 529
 530         schedule_work(&dev->wq_trigger);
 531
 532         return retval;
 533 }
 534
 535 static snd_pcm_uframes_t snd_cx231xx_capture_pointer(struct snd_pcm_substream
 536                                                      *substream)
 537 {
 538         struct cx231xx *dev;
 539         unsigned long flags;
 540         snd_pcm_uframes_t hwptr_done;
 541
 542         dev = snd_pcm_substream_chip(substream);
 543
 544         spin_lock_irqsave(&dev->adev.slock, flags);
 545         hwptr_done = dev->adev.hwptr_done_capture;
 546         spin_unlock_irqrestore(&dev->adev.slock, flags);
 547
 548         return hwptr_done;
 549 }
 550
 551 static const struct snd_pcm_ops snd_cx231xx_pcm_capture = {
 552         .open = snd_cx231xx_capture_open,
 553         .close = snd_cx231xx_pcm_close,
 554         .prepare = snd_cx231xx_prepare,
 555         .trigger = snd_cx231xx_capture_trigger,
 556         .pointer = snd_cx231xx_capture_pointer,
 557 };
 558
 559 static int cx231xx_audio_init(struct cx231xx *dev)
 560 {
 561         struct cx231xx_audio *adev = &dev->adev;
 562         struct snd_pcm *pcm;
 563         struct snd_card *card;
 564         static int devnr;
 565         int err;
 566         struct usb_interface *uif;
 567         int i, isoc_pipe = 0;
 568
 569         if (dev->has_alsa_audio != 1) {
 570                 /* This device does not support the extension (in this case
 571                    the device is expecting the snd-usb-audio module or
 572                    doesn't have analog audio support at all) */
 573                 return 0;
 574         }
 575
 576         dev_dbg(dev->dev,
 577                 "probing for cx231xx non standard usbaudio\n");
 578
 579         err = snd_card_new(dev->dev, index[devnr], "Cx231xx Audio",
 580                            THIS_MODULE, 0, &card);
 581         if (err < 0)
 582                 return err;
 583
 584         spin_lock_init(&adev->slock);
 585         err = snd_pcm_new(card, "Cx231xx Audio", 0, 0, 1, &pcm);
 586         if (err < 0)
 587                 goto err_free_card;
 588
 589         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
 590                         &snd_cx231xx_pcm_capture);
 591         snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_VMALLOC, NULL, 0, 0);
 592         pcm->info_flags = 0;
 593         pcm->private_data = dev;
 594         strscpy(pcm->name, "Conexant cx231xx Capture", sizeof(pcm->name));
 595         strscpy(card->driver, "Cx231xx-Audio", sizeof(card->driver));
 596         strscpy(card->shortname, "Cx231xx Audio", sizeof(card->shortname));
 597         strscpy(card->longname, "Conexant cx231xx Audio", sizeof(card->longname));
 598
 599         INIT_WORK(&dev->wq_trigger, audio_trigger);
 600
 601         err = snd_card_register(card);
 602         if (err < 0)
 603                 goto err_free_card;
 604
 605         adev->sndcard = card;
 606         adev->udev = dev->udev;
 607
 608         /* compute alternate max packet sizes for Audio */
 609         uif =
 610             dev->udev->actconfig->interface[dev->current_pcb_config.
 611                                             hs_config_info[0].interface_info.
 612                                             audio_index + 1];
 613
 614         if (uif->altsetting[0].desc.bNumEndpoints < isoc_pipe + 1) {
 615                 err = -ENODEV;
 616                 goto err_free_card;
 617         }
 618
 619         adev->end_point_addr =
 620             uif->altsetting[0].endpoint[isoc_pipe].desc.
 621                         bEndpointAddress;
 622
 623         adev->num_alt = uif->num_altsetting;
 624         dev_info(dev->dev,
 625                 "audio EndPoint Addr 0x%x, Alternate settings: %i\n",
 626                 adev->end_point_addr, adev->num_alt);
 627         adev->alt_max_pkt_size = kmalloc_array(32, adev->num_alt, GFP_KERNEL);
 628         if (!adev->alt_max_pkt_size) {
 629                 err = -ENOMEM;
 630                 goto err_free_card;
 631         }
 632
 633         for (i = 0; i < adev->num_alt; i++) {
 634                 u16 tmp;
 635
 636                 if (uif->altsetting[i].desc.bNumEndpoints < isoc_pipe + 1) {
 637                         err = -ENODEV;
 638                         goto err_free_pkt_size;
 639                 }
 640
 641                 tmp = le16_to_cpu(uif->altsetting[i].endpoint[isoc_pipe].desc.
 642                                 wMaxPacketSize);
 643                 adev->alt_max_pkt_size[i] =
 644                     (tmp & 0x07ff) * (((tmp & 0x1800) >> 11) + 1);
 645                 dev_dbg(dev->dev,
 646                         "audio alternate setting %i, max size= %i\n", i,
 647                         adev->alt_max_pkt_size[i]);
 648         }
 649
 650         return 0;
 651
 652 err_free_pkt_size:
 653         kfree(adev->alt_max_pkt_size);
 654 err_free_card:
 655         snd_card_free(card);
 656
 657         return err;
 658 }
 659
 660 static int cx231xx_audio_fini(struct cx231xx *dev)
 661 {
 662         if (dev == NULL)
 663                 return 0;
 664
 665         if (dev->has_alsa_audio != 1) {
 666                 /* This device does not support the extension (in this case
 667                    the device is expecting the snd-usb-audio module or
 668                    doesn't have analog audio support at all) */
 669                 return 0;
 670         }
 671
 672         if (dev->adev.sndcard) {
 673                 snd_card_free_when_closed(dev->adev.sndcard);
 674                 kfree(dev->adev.alt_max_pkt_size);
 675                 dev->adev.sndcard = NULL;
 676         }
 677
 678         return 0;
 679 }
 680
 681 static struct cx231xx_ops audio_ops = {
 682         .id = CX231XX_AUDIO,
 683         .name = "Cx231xx Audio Extension",
 684         .init = cx231xx_audio_init,
 685         .fini = cx231xx_audio_fini,
 686 };
 687
 688 static int __init cx231xx_alsa_register(void)
 689 {
 690         return cx231xx_register_extension(&audio_ops);
 691 }
 692
 693 static void __exit cx231xx_alsa_unregister(void)
 694 {
 695         cx231xx_unregister_extension(&audio_ops);
 696 }
 697
 698 MODULE_LICENSE("GPL");
 699 MODULE_AUTHOR("Srinivasa Deevi <srinivasa.deevi@conexant.com>");
 700 MODULE_DESCRIPTION("Cx231xx Audio driver");
 701
 702 module_init(cx231xx_alsa_register);
 703 module_exit(cx231xx_alsa_unregister);