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/vmalloc.h>
  17 #include <linux/module.h>
  18 #include <sound/core.h>
  19 #include <sound/pcm.h>
  20 #include <sound/pcm_params.h>
  21 #include <sound/info.h>
  22 #include <sound/initval.h>
  23 #include <sound/control.h>
  24 #include <media/v4l2-common.h>
  25
  26 static int debug;
  27 module_param(debug, int, 0644);
  28 MODULE_PARM_DESC(debug, "activates debug info");
  29
  30 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
  31
  32 static int cx231xx_isoc_audio_deinit(struct cx231xx *dev)
  33 {
  34         int i;
  35
  36         dev_dbg(dev->dev, "Stopping isoc\n");
  37
  38         for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
  39                 if (dev->adev.urb[i]) {
  40                         if (!irqs_disabled())
  41                                 usb_kill_urb(dev->adev.urb[i]);
  42                         else
  43                                 usb_unlink_urb(dev->adev.urb[i]);
  44
  45                         usb_free_urb(dev->adev.urb[i]);
  46                         dev->adev.urb[i] = NULL;
  47
  48                         kfree(dev->adev.transfer_buffer[i]);
  49                         dev->adev.transfer_buffer[i] = NULL;
  50                 }
  51         }
  52
  53         return 0;
  54 }
  55
  56 static int cx231xx_bulk_audio_deinit(struct cx231xx *dev)
  57 {
  58         int i;
  59
  60         dev_dbg(dev->dev, "Stopping bulk\n");
  61
  62         for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
  63                 if (dev->adev.urb[i]) {
  64                         if (!irqs_disabled())
  65                                 usb_kill_urb(dev->adev.urb[i]);
  66                         else
  67                                 usb_unlink_urb(dev->adev.urb[i]);
  68
  69                         usb_free_urb(dev->adev.urb[i]);
  70                         dev->adev.urb[i] = NULL;
  71
  72                         kfree(dev->adev.transfer_buffer[i]);
  73                         dev->adev.transfer_buffer[i] = NULL;
  74                 }
  75         }
  76
  77         return 0;
  78 }
  79
  80 static void cx231xx_audio_isocirq(struct urb *urb)
  81 {
  82         struct cx231xx *dev = urb->context;
  83         int i;
  84         unsigned int oldptr;
  85         int period_elapsed = 0;
  86         int status;
  87         unsigned char *cp;
  88         unsigned int stride;
  89         struct snd_pcm_substream *substream;
  90         struct snd_pcm_runtime *runtime;
  91
  92         if (dev->state & DEV_DISCONNECTED)
  93                 return;
  94
  95         switch (urb->status) {
  96         case 0:         /* success */
  97         case -ETIMEDOUT:        /* NAK */
  98                 break;
  99         case -ECONNRESET:       /* kill */
 100         case -ENOENT:
 101         case -ESHUTDOWN:
 102                 return;
 103         default:                /* error */
 104                 dev_dbg(dev->dev, "urb completion error %d.\n",
 105                         urb->status);
 106                 break;
 107         }
 108
 109         if (atomic_read(&dev->stream_started) == 0)
 110                 return;
 111
 112         if (dev->adev.capture_pcm_substream) {
 113                 substream = dev->adev.capture_pcm_substream;
 114                 runtime = substream->runtime;
 115                 stride = runtime->frame_bits >> 3;
 116
 117                 for (i = 0; i < urb->number_of_packets; i++) {
 118                         unsigned long flags;
 119                         int length = urb->iso_frame_desc[i].actual_length /
 120                                      stride;
 121                         cp = (unsigned char *)urb->transfer_buffer +
 122                                               urb->iso_frame_desc[i].offset;
 123
 124                         if (!length)
 125                                 continue;
 126
 127                         oldptr = dev->adev.hwptr_done_capture;
 128                         if (oldptr + length >= runtime->buffer_size) {
 129                                 unsigned int cnt;
 130
 131                                 cnt = runtime->buffer_size - oldptr;
 132                                 memcpy(runtime->dma_area + oldptr * stride, cp,
 133                                        cnt * stride);
 134                                 memcpy(runtime->dma_area, cp + cnt * stride,
 135                                        length * stride - cnt * stride);
 136                         } else {
 137                                 memcpy(runtime->dma_area + oldptr * stride, cp,
 138                                        length * stride);
 139                         }
 140
 141                         snd_pcm_stream_lock_irqsave(substream, flags);
 142
 143                         dev->adev.hwptr_done_capture += length;
 144                         if (dev->adev.hwptr_done_capture >=
 145                                                 runtime->buffer_size)
 146                                 dev->adev.hwptr_done_capture -=
 147                                                 runtime->buffer_size;
 148
 149                         dev->adev.capture_transfer_done += length;
 150                         if (dev->adev.capture_transfer_done >=
 151                                 runtime->period_size) {
 152                                 dev->adev.capture_transfer_done -=
 153                                                 runtime->period_size;
 154                                 period_elapsed = 1;
 155                         }
 156                         snd_pcm_stream_unlock_irqrestore(substream, flags);
 157                 }
 158                 if (period_elapsed)
 159                         snd_pcm_period_elapsed(substream);
 160         }
 161         urb->status = 0;
 162
 163         status = usb_submit_urb(urb, GFP_ATOMIC);
 164         if (status < 0) {
 165                 dev_err(dev->dev,
 166                         "resubmit of audio urb failed (error=%i)\n",
 167                         status);
 168         }
 169         return;
 170 }
 171
 172 static void cx231xx_audio_bulkirq(struct urb *urb)
 173 {
 174         struct cx231xx *dev = urb->context;
 175         unsigned int oldptr;
 176         int period_elapsed = 0;
 177         int status;
 178         unsigned char *cp;
 179         unsigned int stride;
 180         struct snd_pcm_substream *substream;
 181         struct snd_pcm_runtime *runtime;
 182
 183         if (dev->state & DEV_DISCONNECTED)
 184                 return;
 185
 186         switch (urb->status) {
 187         case 0:         /* success */
 188         case -ETIMEDOUT:        /* NAK */
 189                 break;
 190         case -ECONNRESET:       /* kill */
 191         case -ENOENT:
 192         case -ESHUTDOWN:
 193                 return;
 194         default:                /* error */
 195                 dev_dbg(dev->dev, "urb completion error %d.\n",
 196                         urb->status);
 197                 break;
 198         }
 199
 200         if (atomic_read(&dev->stream_started) == 0)
 201                 return;
 202
 203         if (dev->adev.capture_pcm_substream) {
 204                 substream = dev->adev.capture_pcm_substream;
 205                 runtime = substream->runtime;
 206                 stride = runtime->frame_bits >> 3;
 207
 208                 if (1) {
 209                         unsigned long flags;
 210                         int length = urb->actual_length /
 211                                      stride;
 212                         cp = (unsigned char *)urb->transfer_buffer;
 213
 214                         oldptr = dev->adev.hwptr_done_capture;
 215                         if (oldptr + length >= runtime->buffer_size) {
 216                                 unsigned int cnt;
 217
 218                                 cnt = runtime->buffer_size - oldptr;
 219                                 memcpy(runtime->dma_area + oldptr * stride, cp,
 220                                        cnt * stride);
 221                                 memcpy(runtime->dma_area, cp + cnt * stride,
 222                                        length * stride - cnt * stride);
 223                         } else {
 224                                 memcpy(runtime->dma_area + oldptr * stride, cp,
 225                                        length * stride);
 226                         }
 227
 228                         snd_pcm_stream_lock_irqsave(substream, flags);
 229
 230                         dev->adev.hwptr_done_capture += length;
 231                         if (dev->adev.hwptr_done_capture >=
 232                                                 runtime->buffer_size)
 233                                 dev->adev.hwptr_done_capture -=
 234                                                 runtime->buffer_size;
 235
 236                         dev->adev.capture_transfer_done += length;
 237                         if (dev->adev.capture_transfer_done >=
 238                                 runtime->period_size) {
 239                                 dev->adev.capture_transfer_done -=
 240                                                 runtime->period_size;
 241                                 period_elapsed = 1;
 242                         }
 243                         snd_pcm_stream_unlock_irqrestore(substream, flags);
 244                 }
 245                 if (period_elapsed)
 246                         snd_pcm_period_elapsed(substream);
 247         }
 248         urb->status = 0;
 249
 250         status = usb_submit_urb(urb, GFP_ATOMIC);
 251         if (status < 0) {
 252                 dev_err(dev->dev,
 253                         "resubmit of audio urb failed (error=%i)\n",
 254                         status);
 255         }
 256         return;
 257 }
 258
 259 static int cx231xx_init_audio_isoc(struct cx231xx *dev)
 260 {
 261         int i, errCode;
 262         int sb_size;
 263
 264         dev_dbg(dev->dev,
 265                 "%s: Starting ISO AUDIO transfers\n", __func__);
 266
 267         if (dev->state & DEV_DISCONNECTED)
 268                 return -ENODEV;
 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                         for (j = 0; j < i; j++) {
 284                                 usb_free_urb(dev->adev.urb[j]);
 285                                 kfree(dev->adev.transfer_buffer[j]);
 286                         }
 287                         return -ENOMEM;
 288                 }
 289
 290                 urb->dev = dev->udev;
 291                 urb->context = dev;
 292                 urb->pipe = usb_rcvisocpipe(dev->udev,
 293                                                 dev->adev.end_point_addr);
 294                 urb->transfer_flags = URB_ISO_ASAP;
 295                 urb->transfer_buffer = dev->adev.transfer_buffer[i];
 296                 urb->interval = 1;
 297                 urb->complete = cx231xx_audio_isocirq;
 298                 urb->number_of_packets = CX231XX_ISO_NUM_AUDIO_PACKETS;
 299                 urb->transfer_buffer_length = sb_size;
 300
 301                 for (j = k = 0; j < CX231XX_ISO_NUM_AUDIO_PACKETS;
 302                         j++, k += dev->adev.max_pkt_size) {
 303                         urb->iso_frame_desc[j].offset = k;
 304                         urb->iso_frame_desc[j].length = dev->adev.max_pkt_size;
 305                 }
 306                 dev->adev.urb[i] = urb;
 307         }
 308
 309         for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
 310                 errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC);
 311                 if (errCode < 0) {
 312                         cx231xx_isoc_audio_deinit(dev);
 313                         return errCode;
 314                 }
 315         }
 316
 317         return errCode;
 318 }
 319
 320 static int cx231xx_init_audio_bulk(struct cx231xx *dev)
 321 {
 322         int i, errCode;
 323         int sb_size;
 324
 325         dev_dbg(dev->dev,
 326                 "%s: Starting BULK AUDIO transfers\n", __func__);
 327
 328         if (dev->state & DEV_DISCONNECTED)
 329                 return -ENODEV;
 330
 331         sb_size = CX231XX_NUM_AUDIO_PACKETS * dev->adev.max_pkt_size;
 332
 333         for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
 334                 struct urb *urb;
 335                 int j;
 336
 337                 dev->adev.transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC);
 338                 if (!dev->adev.transfer_buffer[i])
 339                         return -ENOMEM;
 340
 341                 memset(dev->adev.transfer_buffer[i], 0x80, sb_size);
 342                 urb = usb_alloc_urb(CX231XX_NUM_AUDIO_PACKETS, GFP_ATOMIC);
 343                 if (!urb) {
 344                         for (j = 0; j < i; j++) {
 345                                 usb_free_urb(dev->adev.urb[j]);
 346                                 kfree(dev->adev.transfer_buffer[j]);
 347                         }
 348                         return -ENOMEM;
 349                 }
 350
 351                 urb->dev = dev->udev;
 352                 urb->context = dev;
 353                 urb->pipe = usb_rcvbulkpipe(dev->udev,
 354                                                 dev->adev.end_point_addr);
 355                 urb->transfer_flags = 0;
 356                 urb->transfer_buffer = dev->adev.transfer_buffer[i];
 357                 urb->complete = cx231xx_audio_bulkirq;
 358                 urb->transfer_buffer_length = sb_size;
 359
 360                 dev->adev.urb[i] = urb;
 361
 362         }
 363
 364         for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
 365                 errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC);
 366                 if (errCode < 0) {
 367                         cx231xx_bulk_audio_deinit(dev);
 368                         return errCode;
 369                 }
 370         }
 371
 372         return errCode;
 373 }
 374
 375 static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
 376                                         size_t size)
 377 {
 378         struct snd_pcm_runtime *runtime = subs->runtime;
 379         struct cx231xx *dev = snd_pcm_substream_chip(subs);
 380
 381         dev_dbg(dev->dev, "Allocating vbuffer\n");
 382         if (runtime->dma_area) {
 383                 if (runtime->dma_bytes > size)
 384                         return 0;
 385
 386                 vfree(runtime->dma_area);
 387         }
 388         runtime->dma_area = vmalloc(size);
 389         if (!runtime->dma_area)
 390                 return -ENOMEM;
 391
 392         runtime->dma_bytes = size;
 393
 394         return 0;
 395 }
 396
 397 static const struct snd_pcm_hardware snd_cx231xx_hw_capture = {
 398         .info = SNDRV_PCM_INFO_BLOCK_TRANSFER   |
 399             SNDRV_PCM_INFO_MMAP                 |
 400             SNDRV_PCM_INFO_INTERLEAVED          |
 401             SNDRV_PCM_INFO_MMAP_VALID,
 402
 403         .formats = SNDRV_PCM_FMTBIT_S16_LE,
 404
 405         .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_KNOT,
 406
 407         .rate_min = 48000,
 408         .rate_max = 48000,
 409         .channels_min = 2,
 410         .channels_max = 2,
 411         .buffer_bytes_max = 62720 * 8,  /* just about the value in usbaudio.c */
 412         .period_bytes_min = 64,         /* 12544/2, */
 413         .period_bytes_max = 12544,
 414         .periods_min = 2,
 415         .periods_max = 98,              /* 12544, */
 416 };
 417
 418 static int snd_cx231xx_capture_open(struct snd_pcm_substream *substream)
 419 {
 420         struct cx231xx *dev = snd_pcm_substream_chip(substream);
 421         struct snd_pcm_runtime *runtime = substream->runtime;
 422         int ret = 0;
 423
 424         dev_dbg(dev->dev,
 425                 "opening device and trying to acquire exclusive lock\n");
 426
 427         if (dev->state & DEV_DISCONNECTED) {
 428                 dev_err(dev->dev,
 429                         "Can't open. the device was removed.\n");
 430                 return -ENODEV;
 431         }
 432
 433         /* set alternate setting for audio interface */
 434         /* 1 - 48000 samples per sec */
 435         mutex_lock(&dev->lock);
 436         if (dev->USE_ISO)
 437                 ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 1);
 438         else
 439                 ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 0);
 440         mutex_unlock(&dev->lock);
 441         if (ret < 0) {
 442                 dev_err(dev->dev,
 443                         "failed to set alternate setting !\n");
 444
 445                 return ret;
 446         }
 447
 448         runtime->hw = snd_cx231xx_hw_capture;
 449
 450         mutex_lock(&dev->lock);
 451         /* inform hardware to start streaming */
 452         ret = cx231xx_capture_start(dev, 1, Audio);
 453
 454         dev->adev.users++;
 455         mutex_unlock(&dev->lock);
 456
 457         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
 458         dev->adev.capture_pcm_substream = substream;
 459         runtime->private_data = dev;
 460
 461         return 0;
 462 }
 463
 464 static int snd_cx231xx_pcm_close(struct snd_pcm_substream *substream)
 465 {
 466         int ret;
 467         struct cx231xx *dev = snd_pcm_substream_chip(substream);
 468
 469         dev_dbg(dev->dev, "closing device\n");
 470
 471         /* inform hardware to stop streaming */
 472         mutex_lock(&dev->lock);
 473         ret = cx231xx_capture_start(dev, 0, Audio);
 474
 475         /* set alternate setting for audio interface */
 476         /* 1 - 48000 samples per sec */
 477         ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 0);
 478         if (ret < 0) {
 479                 dev_err(dev->dev,
 480                         "failed to set alternate setting !\n");
 481
 482                 mutex_unlock(&dev->lock);
 483                 return ret;
 484         }
 485
 486         dev->adev.users--;
 487         if (substream->runtime->dma_area) {
 488                 dev_dbg(dev->dev, "freeing\n");
 489                 vfree(substream->runtime->dma_area);
 490                 substream->runtime->dma_area = NULL;
 491         }
 492         mutex_unlock(&dev->lock);
 493
 494         if (dev->adev.users == 0 && dev->adev.shutdown == 1) {
 495                 dev_dbg(dev->dev, "audio users: %d\n", dev->adev.users);
 496                 dev_dbg(dev->dev, "disabling audio stream!\n");
 497                 dev->adev.shutdown = 0;
 498                 dev_dbg(dev->dev, "released lock\n");
 499                 if (atomic_read(&dev->stream_started) > 0) {
 500                         atomic_set(&dev->stream_started, 0);
 501                         schedule_work(&dev->wq_trigger);
 502                 }
 503         }
 504         return 0;
 505 }
 506
 507 static int snd_cx231xx_hw_capture_params(struct snd_pcm_substream *substream,
 508                                          struct snd_pcm_hw_params *hw_params)
 509 {
 510         struct cx231xx *dev = snd_pcm_substream_chip(substream);
 511         int ret;
 512
 513         dev_dbg(dev->dev, "Setting capture parameters\n");
 514
 515         ret = snd_pcm_alloc_vmalloc_buffer(substream,
 516                                            params_buffer_bytes(hw_params));
 517 #if 0
 518         /* TODO: set up cx231xx audio chip to deliver the correct audio format,
 519            current default is 48000hz multiplexed => 96000hz mono
 520            which shouldn't matter since analogue TV only supports mono */
 521         unsigned int channels, rate, format;
 522
 523         format = params_format(hw_params);
 524         rate = params_rate(hw_params);
 525         channels = params_channels(hw_params);
 526 #endif
 527
 528         return ret;
 529 }
 530
 531 static int snd_cx231xx_hw_capture_free(struct snd_pcm_substream *substream)
 532 {
 533         struct cx231xx *dev = snd_pcm_substream_chip(substream);
 534
 535         dev_dbg(dev->dev, "Stop capture, if needed\n");
 536
 537         if (atomic_read(&dev->stream_started) > 0) {
 538                 atomic_set(&dev->stream_started, 0);
 539                 schedule_work(&dev->wq_trigger);
 540         }
 541
 542         return 0;
 543 }
 544
 545 static int snd_cx231xx_prepare(struct snd_pcm_substream *substream)
 546 {
 547         struct cx231xx *dev = snd_pcm_substream_chip(substream);
 548
 549         dev->adev.hwptr_done_capture = 0;
 550         dev->adev.capture_transfer_done = 0;
 551
 552         return 0;
 553 }
 554
 555 static void audio_trigger(struct work_struct *work)
 556 {
 557         struct cx231xx *dev = container_of(work, struct cx231xx, wq_trigger);
 558
 559         if (atomic_read(&dev->stream_started)) {
 560                 dev_dbg(dev->dev, "starting capture");
 561                 if (is_fw_load(dev) == 0)
 562                         cx25840_call(dev, core, load_fw);
 563                 if (dev->USE_ISO)
 564                         cx231xx_init_audio_isoc(dev);
 565                 else
 566                         cx231xx_init_audio_bulk(dev);
 567         } else {
 568                 dev_dbg(dev->dev, "stopping capture");
 569                 cx231xx_isoc_audio_deinit(dev);
 570         }
 571 }
 572
 573 static int snd_cx231xx_capture_trigger(struct snd_pcm_substream *substream,
 574                                        int cmd)
 575 {
 576         struct cx231xx *dev = snd_pcm_substream_chip(substream);
 577         int retval = 0;
 578
 579         if (dev->state & DEV_DISCONNECTED)
 580                 return -ENODEV;
 581
 582         spin_lock(&dev->adev.slock);
 583         switch (cmd) {
 584         case SNDRV_PCM_TRIGGER_START:
 585                 atomic_set(&dev->stream_started, 1);
 586                 break;
 587         case SNDRV_PCM_TRIGGER_STOP:
 588                 atomic_set(&dev->stream_started, 0);
 589                 break;
 590         default:
 591                 retval = -EINVAL;
 592                 break;
 593         }
 594         spin_unlock(&dev->adev.slock);
 595
 596         schedule_work(&dev->wq_trigger);
 597
 598         return retval;
 599 }
 600
 601 static snd_pcm_uframes_t snd_cx231xx_capture_pointer(struct snd_pcm_substream
 602                                                      *substream)
 603 {
 604         struct cx231xx *dev;
 605         unsigned long flags;
 606         snd_pcm_uframes_t hwptr_done;
 607
 608         dev = snd_pcm_substream_chip(substream);
 609
 610         spin_lock_irqsave(&dev->adev.slock, flags);
 611         hwptr_done = dev->adev.hwptr_done_capture;
 612         spin_unlock_irqrestore(&dev->adev.slock, flags);
 613
 614         return hwptr_done;
 615 }
 616
 617 static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
 618                                              unsigned long offset)
 619 {
 620         void *pageptr = subs->runtime->dma_area + offset;
 621
 622         return vmalloc_to_page(pageptr);
 623 }
 624
 625 static const struct snd_pcm_ops snd_cx231xx_pcm_capture = {
 626         .open = snd_cx231xx_capture_open,
 627         .close = snd_cx231xx_pcm_close,
 628         .ioctl = snd_pcm_lib_ioctl,
 629         .hw_params = snd_cx231xx_hw_capture_params,
 630         .hw_free = snd_cx231xx_hw_capture_free,
 631         .prepare = snd_cx231xx_prepare,
 632         .trigger = snd_cx231xx_capture_trigger,
 633         .pointer = snd_cx231xx_capture_pointer,
 634         .page = snd_pcm_get_vmalloc_page,
 635 };
 636
 637 static int cx231xx_audio_init(struct cx231xx *dev)
 638 {
 639         struct cx231xx_audio *adev = &dev->adev;
 640         struct snd_pcm *pcm;
 641         struct snd_card *card;
 642         static int devnr;
 643         int err;
 644         struct usb_interface *uif;
 645         int i, isoc_pipe = 0;
 646
 647         if (dev->has_alsa_audio != 1) {
 648                 /* This device does not support the extension (in this case
 649                    the device is expecting the snd-usb-audio module or
 650                    doesn't have analog audio support at all) */
 651                 return 0;
 652         }
 653
 654         dev_dbg(dev->dev,
 655                 "probing for cx231xx non standard usbaudio\n");
 656
 657         err = snd_card_new(dev->dev, index[devnr], "Cx231xx Audio",
 658                            THIS_MODULE, 0, &card);
 659         if (err < 0)
 660                 return err;
 661
 662         spin_lock_init(&adev->slock);
 663         err = snd_pcm_new(card, "Cx231xx Audio", 0, 0, 1, &pcm);
 664         if (err < 0)
 665                 goto err_free_card;
 666
 667         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
 668                         &snd_cx231xx_pcm_capture);
 669         pcm->info_flags = 0;
 670         pcm->private_data = dev;
 671         strscpy(pcm->name, "Conexant cx231xx Capture", sizeof(pcm->name));
 672         strscpy(card->driver, "Cx231xx-Audio", sizeof(card->driver));
 673         strscpy(card->shortname, "Cx231xx Audio", sizeof(card->shortname));
 674         strscpy(card->longname, "Conexant cx231xx Audio", sizeof(card->longname));
 675
 676         INIT_WORK(&dev->wq_trigger, audio_trigger);
 677
 678         err = snd_card_register(card);
 679         if (err < 0)
 680                 goto err_free_card;
 681
 682         adev->sndcard = card;
 683         adev->udev = dev->udev;
 684
 685         /* compute alternate max packet sizes for Audio */
 686         uif =
 687             dev->udev->actconfig->interface[dev->current_pcb_config.
 688                                             hs_config_info[0].interface_info.
 689                                             audio_index + 1];
 690
 691         if (uif->altsetting[0].desc.bNumEndpoints < isoc_pipe + 1) {
 692                 err = -ENODEV;
 693                 goto err_free_card;
 694         }
 695
 696         adev->end_point_addr =
 697             uif->altsetting[0].endpoint[isoc_pipe].desc.
 698                         bEndpointAddress;
 699
 700         adev->num_alt = uif->num_altsetting;
 701         dev_info(dev->dev,
 702                 "audio EndPoint Addr 0x%x, Alternate settings: %i\n",
 703                 adev->end_point_addr, adev->num_alt);
 704         adev->alt_max_pkt_size = kmalloc_array(32, adev->num_alt, GFP_KERNEL);
 705         if (!adev->alt_max_pkt_size) {
 706                 err = -ENOMEM;
 707                 goto err_free_card;
 708         }
 709
 710         for (i = 0; i < adev->num_alt; i++) {
 711                 u16 tmp;
 712
 713                 if (uif->altsetting[i].desc.bNumEndpoints < isoc_pipe + 1) {
 714                         err = -ENODEV;
 715                         goto err_free_pkt_size;
 716                 }
 717
 718                 tmp = le16_to_cpu(uif->altsetting[i].endpoint[isoc_pipe].desc.
 719                                 wMaxPacketSize);
 720                 adev->alt_max_pkt_size[i] =
 721                     (tmp & 0x07ff) * (((tmp & 0x1800) >> 11) + 1);
 722                 dev_dbg(dev->dev,
 723                         "audio alternate setting %i, max size= %i\n", i,
 724                         adev->alt_max_pkt_size[i]);
 725         }
 726
 727         return 0;
 728
 729 err_free_pkt_size:
 730         kfree(adev->alt_max_pkt_size);
 731 err_free_card:
 732         snd_card_free(card);
 733
 734         return err;
 735 }
 736
 737 static int cx231xx_audio_fini(struct cx231xx *dev)
 738 {
 739         if (dev == NULL)
 740                 return 0;
 741
 742         if (dev->has_alsa_audio != 1) {
 743                 /* This device does not support the extension (in this case
 744                    the device is expecting the snd-usb-audio module or
 745                    doesn't have analog audio support at all) */
 746                 return 0;
 747         }
 748
 749         if (dev->adev.sndcard) {
 750                 snd_card_free(dev->adev.sndcard);
 751                 kfree(dev->adev.alt_max_pkt_size);
 752                 dev->adev.sndcard = NULL;
 753         }
 754
 755         return 0;
 756 }
 757
 758 static struct cx231xx_ops audio_ops = {
 759         .id = CX231XX_AUDIO,
 760         .name = "Cx231xx Audio Extension",
 761         .init = cx231xx_audio_init,
 762         .fini = cx231xx_audio_fini,
 763 };
 764
 765 static int __init cx231xx_alsa_register(void)
 766 {
 767         return cx231xx_register_extension(&audio_ops);
 768 }
 769
 770 static void __exit cx231xx_alsa_unregister(void)
 771 {
 772         cx231xx_unregister_extension(&audio_ops);
 773 }
 774
 775 MODULE_LICENSE("GPL");
 776 MODULE_AUTHOR("Srinivasa Deevi <srinivasa.deevi@conexant.com>");
 777 MODULE_DESCRIPTION("Cx231xx Audio driver");
 778
 779 module_init(cx231xx_alsa_register);
 780 module_exit(cx231xx_alsa_unregister);