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

   1 /*
   2  *  Conexant Cx231xx audio extension
   3  *
   4  *  Copyright (C) 2008 <srinivasa.deevi at conexant dot com>
   5  *       Based on em28xx driver
   6  *
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  */
  18
  19 #include "cx231xx.h"
  20 #include <linux/kernel.h>
  21 #include <linux/init.h>
  22 #include <linux/sound.h>
  23 #include <linux/spinlock.h>
  24 #include <linux/soundcard.h>
  25 #include <linux/slab.h>
  26 #include <linux/vmalloc.h>
  27 #include <linux/proc_fs.h>
  28 #include <linux/module.h>
  29 #include <sound/core.h>
  30 #include <sound/pcm.h>
  31 #include <sound/pcm_params.h>
  32 #include <sound/info.h>
  33 #include <sound/initval.h>
  34 #include <sound/control.h>
  35 #include <media/v4l2-common.h>
  36
  37 static int debug;
  38 module_param(debug, int, 0644);
  39 MODULE_PARM_DESC(debug, "activates debug info");
  40
  41 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
  42
  43 static int cx231xx_isoc_audio_deinit(struct cx231xx *dev)
  44 {
  45         int i;
  46
  47         dev_dbg(dev->dev, "Stopping isoc\n");
  48
  49         for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
  50                 if (dev->adev.urb[i]) {
  51                         if (!irqs_disabled())
  52                                 usb_kill_urb(dev->adev.urb[i]);
  53                         else
  54                                 usb_unlink_urb(dev->adev.urb[i]);
  55
  56                         usb_free_urb(dev->adev.urb[i]);
  57                         dev->adev.urb[i] = NULL;
  58
  59                         kfree(dev->adev.transfer_buffer[i]);
  60                         dev->adev.transfer_buffer[i] = NULL;
  61                 }
  62         }
  63
  64         return 0;
  65 }
  66
  67 static int cx231xx_bulk_audio_deinit(struct cx231xx *dev)
  68 {
  69         int i;
  70
  71         dev_dbg(dev->dev, "Stopping bulk\n");
  72
  73         for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
  74                 if (dev->adev.urb[i]) {
  75                         if (!irqs_disabled())
  76                                 usb_kill_urb(dev->adev.urb[i]);
  77                         else
  78                                 usb_unlink_urb(dev->adev.urb[i]);
  79
  80                         usb_free_urb(dev->adev.urb[i]);
  81                         dev->adev.urb[i] = NULL;
  82
  83                         kfree(dev->adev.transfer_buffer[i]);
  84                         dev->adev.transfer_buffer[i] = NULL;
  85                 }
  86         }
  87
  88         return 0;
  89 }
  90
  91 static void cx231xx_audio_isocirq(struct urb *urb)
  92 {
  93         struct cx231xx *dev = urb->context;
  94         int i;
  95         unsigned int oldptr;
  96         int period_elapsed = 0;
  97         int status;
  98         unsigned char *cp;
  99         unsigned int stride;
 100         struct snd_pcm_substream *substream;
 101         struct snd_pcm_runtime *runtime;
 102
 103         if (dev->state & DEV_DISCONNECTED)
 104                 return;
 105
 106         switch (urb->status) {
 107         case 0:         /* success */
 108         case -ETIMEDOUT:        /* NAK */
 109                 break;
 110         case -ECONNRESET:       /* kill */
 111         case -ENOENT:
 112         case -ESHUTDOWN:
 113                 return;
 114         default:                /* error */
 115                 dev_dbg(dev->dev, "urb completition error %d.\n",
 116                         urb->status);
 117                 break;
 118         }
 119
 120         if (atomic_read(&dev->stream_started) == 0)
 121                 return;
 122
 123         if (dev->adev.capture_pcm_substream) {
 124                 substream = dev->adev.capture_pcm_substream;
 125                 runtime = substream->runtime;
 126                 stride = runtime->frame_bits >> 3;
 127
 128                 for (i = 0; i < urb->number_of_packets; i++) {
 129                         int length = urb->iso_frame_desc[i].actual_length /
 130                                      stride;
 131                         cp = (unsigned char *)urb->transfer_buffer +
 132                                               urb->iso_frame_desc[i].offset;
 133
 134                         if (!length)
 135                                 continue;
 136
 137                         oldptr = dev->adev.hwptr_done_capture;
 138                         if (oldptr + length >= runtime->buffer_size) {
 139                                 unsigned int cnt;
 140
 141                                 cnt = runtime->buffer_size - oldptr;
 142                                 memcpy(runtime->dma_area + oldptr * stride, cp,
 143                                        cnt * stride);
 144                                 memcpy(runtime->dma_area, cp + cnt * stride,
 145                                        length * stride - cnt * stride);
 146                         } else {
 147                                 memcpy(runtime->dma_area + oldptr * stride, cp,
 148                                        length * stride);
 149                         }
 150
 151                         snd_pcm_stream_lock(substream);
 152
 153                         dev->adev.hwptr_done_capture += length;
 154                         if (dev->adev.hwptr_done_capture >=
 155                                                 runtime->buffer_size)
 156                                 dev->adev.hwptr_done_capture -=
 157                                                 runtime->buffer_size;
 158
 159                         dev->adev.capture_transfer_done += length;
 160                         if (dev->adev.capture_transfer_done >=
 161                                 runtime->period_size) {
 162                                 dev->adev.capture_transfer_done -=
 163                                                 runtime->period_size;
 164                                 period_elapsed = 1;
 165                         }
 166                         snd_pcm_stream_unlock(substream);
 167                 }
 168                 if (period_elapsed)
 169                         snd_pcm_period_elapsed(substream);
 170         }
 171         urb->status = 0;
 172
 173         status = usb_submit_urb(urb, GFP_ATOMIC);
 174         if (status < 0) {
 175                 dev_err(dev->dev,
 176                         "resubmit of audio urb failed (error=%i)\n",
 177                         status);
 178         }
 179         return;
 180 }
 181
 182 static void cx231xx_audio_bulkirq(struct urb *urb)
 183 {
 184         struct cx231xx *dev = urb->context;
 185         unsigned int oldptr;
 186         int period_elapsed = 0;
 187         int status;
 188         unsigned char *cp;
 189         unsigned int stride;
 190         struct snd_pcm_substream *substream;
 191         struct snd_pcm_runtime *runtime;
 192
 193         if (dev->state & DEV_DISCONNECTED)
 194                 return;
 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                 dev_dbg(dev->dev, "urb completition error %d.\n",
 206                         urb->status);
 207                 break;
 208         }
 209
 210         if (atomic_read(&dev->stream_started) == 0)
 211                 return;
 212
 213         if (dev->adev.capture_pcm_substream) {
 214                 substream = dev->adev.capture_pcm_substream;
 215                 runtime = substream->runtime;
 216                 stride = runtime->frame_bits >> 3;
 217
 218                 if (1) {
 219                         int length = urb->actual_length /
 220                                      stride;
 221                         cp = (unsigned char *)urb->transfer_buffer;
 222
 223                         oldptr = dev->adev.hwptr_done_capture;
 224                         if (oldptr + length >= runtime->buffer_size) {
 225                                 unsigned int cnt;
 226
 227                                 cnt = runtime->buffer_size - oldptr;
 228                                 memcpy(runtime->dma_area + oldptr * stride, cp,
 229                                        cnt * stride);
 230                                 memcpy(runtime->dma_area, cp + cnt * stride,
 231                                        length * stride - cnt * stride);
 232                         } else {
 233                                 memcpy(runtime->dma_area + oldptr * stride, cp,
 234                                        length * stride);
 235                         }
 236
 237                         snd_pcm_stream_lock(substream);
 238
 239                         dev->adev.hwptr_done_capture += length;
 240                         if (dev->adev.hwptr_done_capture >=
 241                                                 runtime->buffer_size)
 242                                 dev->adev.hwptr_done_capture -=
 243                                                 runtime->buffer_size;
 244
 245                         dev->adev.capture_transfer_done += length;
 246                         if (dev->adev.capture_transfer_done >=
 247                                 runtime->period_size) {
 248                                 dev->adev.capture_transfer_done -=
 249                                                 runtime->period_size;
 250                                 period_elapsed = 1;
 251                         }
 252                         snd_pcm_stream_unlock(substream);
 253                 }
 254                 if (period_elapsed)
 255                         snd_pcm_period_elapsed(substream);
 256         }
 257         urb->status = 0;
 258
 259         status = usb_submit_urb(urb, GFP_ATOMIC);
 260         if (status < 0) {
 261                 dev_err(dev->dev,
 262                         "resubmit of audio urb failed (error=%i)\n",
 263                         status);
 264         }
 265         return;
 266 }
 267
 268 static int cx231xx_init_audio_isoc(struct cx231xx *dev)
 269 {
 270         int i, errCode;
 271         int sb_size;
 272
 273         dev_dbg(dev->dev,
 274                 "%s: Starting ISO AUDIO transfers\n", __func__);
 275
 276         if (dev->state & DEV_DISCONNECTED)
 277                 return -ENODEV;
 278
 279         sb_size = CX231XX_ISO_NUM_AUDIO_PACKETS * dev->adev.max_pkt_size;
 280
 281         for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
 282                 struct urb *urb;
 283                 int j, k;
 284
 285                 dev->adev.transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC);
 286                 if (!dev->adev.transfer_buffer[i])
 287                         return -ENOMEM;
 288
 289                 memset(dev->adev.transfer_buffer[i], 0x80, sb_size);
 290                 urb = usb_alloc_urb(CX231XX_ISO_NUM_AUDIO_PACKETS, GFP_ATOMIC);
 291                 if (!urb) {
 292                         for (j = 0; j < i; j++) {
 293                                 usb_free_urb(dev->adev.urb[j]);
 294                                 kfree(dev->adev.transfer_buffer[j]);
 295                         }
 296                         return -ENOMEM;
 297                 }
 298
 299                 urb->dev = dev->udev;
 300                 urb->context = dev;
 301                 urb->pipe = usb_rcvisocpipe(dev->udev,
 302                                                 dev->adev.end_point_addr);
 303                 urb->transfer_flags = URB_ISO_ASAP;
 304                 urb->transfer_buffer = dev->adev.transfer_buffer[i];
 305                 urb->interval = 1;
 306                 urb->complete = cx231xx_audio_isocirq;
 307                 urb->number_of_packets = CX231XX_ISO_NUM_AUDIO_PACKETS;
 308                 urb->transfer_buffer_length = sb_size;
 309
 310                 for (j = k = 0; j < CX231XX_ISO_NUM_AUDIO_PACKETS;
 311                         j++, k += dev->adev.max_pkt_size) {
 312                         urb->iso_frame_desc[j].offset = k;
 313                         urb->iso_frame_desc[j].length = dev->adev.max_pkt_size;
 314                 }
 315                 dev->adev.urb[i] = urb;
 316         }
 317
 318         for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
 319                 errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC);
 320                 if (errCode < 0) {
 321                         cx231xx_isoc_audio_deinit(dev);
 322                         return errCode;
 323                 }
 324         }
 325
 326         return errCode;
 327 }
 328
 329 static int cx231xx_init_audio_bulk(struct cx231xx *dev)
 330 {
 331         int i, errCode;
 332         int sb_size;
 333
 334         dev_dbg(dev->dev,
 335                 "%s: Starting BULK AUDIO transfers\n", __func__);
 336
 337         if (dev->state & DEV_DISCONNECTED)
 338                 return -ENODEV;
 339
 340         sb_size = CX231XX_NUM_AUDIO_PACKETS * dev->adev.max_pkt_size;
 341
 342         for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
 343                 struct urb *urb;
 344                 int j;
 345
 346                 dev->adev.transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC);
 347                 if (!dev->adev.transfer_buffer[i])
 348                         return -ENOMEM;
 349
 350                 memset(dev->adev.transfer_buffer[i], 0x80, sb_size);
 351                 urb = usb_alloc_urb(CX231XX_NUM_AUDIO_PACKETS, GFP_ATOMIC);
 352                 if (!urb) {
 353                         for (j = 0; j < i; j++) {
 354                                 usb_free_urb(dev->adev.urb[j]);
 355                                 kfree(dev->adev.transfer_buffer[j]);
 356                         }
 357                         return -ENOMEM;
 358                 }
 359
 360                 urb->dev = dev->udev;
 361                 urb->context = dev;
 362                 urb->pipe = usb_rcvbulkpipe(dev->udev,
 363                                                 dev->adev.end_point_addr);
 364                 urb->transfer_flags = 0;
 365                 urb->transfer_buffer = dev->adev.transfer_buffer[i];
 366                 urb->complete = cx231xx_audio_bulkirq;
 367                 urb->transfer_buffer_length = sb_size;
 368
 369                 dev->adev.urb[i] = urb;
 370
 371         }
 372
 373         for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
 374                 errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC);
 375                 if (errCode < 0) {
 376                         cx231xx_bulk_audio_deinit(dev);
 377                         return errCode;
 378                 }
 379         }
 380
 381         return errCode;
 382 }
 383
 384 static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
 385                                         size_t size)
 386 {
 387         struct snd_pcm_runtime *runtime = subs->runtime;
 388         struct cx231xx *dev = snd_pcm_substream_chip(subs);
 389
 390         dev_dbg(dev->dev, "Allocating vbuffer\n");
 391         if (runtime->dma_area) {
 392                 if (runtime->dma_bytes > size)
 393                         return 0;
 394
 395                 vfree(runtime->dma_area);
 396         }
 397         runtime->dma_area = vmalloc(size);
 398         if (!runtime->dma_area)
 399                 return -ENOMEM;
 400
 401         runtime->dma_bytes = size;
 402
 403         return 0;
 404 }
 405
 406 static struct snd_pcm_hardware snd_cx231xx_hw_capture = {
 407         .info = SNDRV_PCM_INFO_BLOCK_TRANSFER   |
 408             SNDRV_PCM_INFO_MMAP                 |
 409             SNDRV_PCM_INFO_INTERLEAVED          |
 410             SNDRV_PCM_INFO_MMAP_VALID,
 411
 412         .formats = SNDRV_PCM_FMTBIT_S16_LE,
 413
 414         .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_KNOT,
 415
 416         .rate_min = 48000,
 417         .rate_max = 48000,
 418         .channels_min = 2,
 419         .channels_max = 2,
 420         .buffer_bytes_max = 62720 * 8,  /* just about the value in usbaudio.c */
 421         .period_bytes_min = 64,         /* 12544/2, */
 422         .period_bytes_max = 12544,
 423         .periods_min = 2,
 424         .periods_max = 98,              /* 12544, */
 425 };
 426
 427 static int snd_cx231xx_capture_open(struct snd_pcm_substream *substream)
 428 {
 429         struct cx231xx *dev = snd_pcm_substream_chip(substream);
 430         struct snd_pcm_runtime *runtime = substream->runtime;
 431         int ret = 0;
 432
 433         dev_dbg(dev->dev,
 434                 "opening device and trying to acquire exclusive lock\n");
 435
 436         if (dev->state & DEV_DISCONNECTED) {
 437                 dev_err(dev->dev,
 438                         "Can't open. the device was removed.\n");
 439                 return -ENODEV;
 440         }
 441
 442         /* set alternate setting for audio interface */
 443         /* 1 - 48000 samples per sec */
 444         mutex_lock(&dev->lock);
 445         if (dev->USE_ISO)
 446                 ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 1);
 447         else
 448                 ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 0);
 449         mutex_unlock(&dev->lock);
 450         if (ret < 0) {
 451                 dev_err(dev->dev,
 452                         "failed to set alternate setting !\n");
 453
 454                 return ret;
 455         }
 456
 457         runtime->hw = snd_cx231xx_hw_capture;
 458
 459         mutex_lock(&dev->lock);
 460         /* inform hardware to start streaming */
 461         ret = cx231xx_capture_start(dev, 1, Audio);
 462
 463         dev->adev.users++;
 464         mutex_unlock(&dev->lock);
 465
 466         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
 467         dev->adev.capture_pcm_substream = substream;
 468         runtime->private_data = dev;
 469
 470         return 0;
 471 }
 472
 473 static int snd_cx231xx_pcm_close(struct snd_pcm_substream *substream)
 474 {
 475         int ret;
 476         struct cx231xx *dev = snd_pcm_substream_chip(substream);
 477
 478         dev_dbg(dev->dev, "closing device\n");
 479
 480         /* inform hardware to stop streaming */
 481         mutex_lock(&dev->lock);
 482         ret = cx231xx_capture_start(dev, 0, Audio);
 483
 484         /* set alternate setting for audio interface */
 485         /* 1 - 48000 samples per sec */
 486         ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 0);
 487         if (ret < 0) {
 488                 dev_err(dev->dev,
 489                         "failed to set alternate setting !\n");
 490
 491                 mutex_unlock(&dev->lock);
 492                 return ret;
 493         }
 494
 495         dev->adev.users--;
 496         if (substream->runtime->dma_area) {
 497                 dev_dbg(dev->dev, "freeing\n");
 498                 vfree(substream->runtime->dma_area);
 499                 substream->runtime->dma_area = NULL;
 500         }
 501         mutex_unlock(&dev->lock);
 502
 503         if (dev->adev.users == 0 && dev->adev.shutdown == 1) {
 504                 dev_dbg(dev->dev, "audio users: %d\n", dev->adev.users);
 505                 dev_dbg(dev->dev, "disabling audio stream!\n");
 506                 dev->adev.shutdown = 0;
 507                 dev_dbg(dev->dev, "released lock\n");
 508                 if (atomic_read(&dev->stream_started) > 0) {
 509                         atomic_set(&dev->stream_started, 0);
 510                         schedule_work(&dev->wq_trigger);
 511                 }
 512         }
 513         return 0;
 514 }
 515
 516 static int snd_cx231xx_hw_capture_params(struct snd_pcm_substream *substream,
 517                                          struct snd_pcm_hw_params *hw_params)
 518 {
 519         struct cx231xx *dev = snd_pcm_substream_chip(substream);
 520         int ret;
 521
 522         dev_dbg(dev->dev, "Setting capture parameters\n");
 523
 524         ret = snd_pcm_alloc_vmalloc_buffer(substream,
 525                                            params_buffer_bytes(hw_params));
 526 #if 0
 527         /* TODO: set up cx231xx audio chip to deliver the correct audio format,
 528            current default is 48000hz multiplexed => 96000hz mono
 529            which shouldn't matter since analogue TV only supports mono */
 530         unsigned int channels, rate, format;
 531
 532         format = params_format(hw_params);
 533         rate = params_rate(hw_params);
 534         channels = params_channels(hw_params);
 535 #endif
 536
 537         return ret;
 538 }
 539
 540 static int snd_cx231xx_hw_capture_free(struct snd_pcm_substream *substream)
 541 {
 542         struct cx231xx *dev = snd_pcm_substream_chip(substream);
 543
 544         dev_dbg(dev->dev, "Stop capture, if needed\n");
 545
 546         if (atomic_read(&dev->stream_started) > 0) {
 547                 atomic_set(&dev->stream_started, 0);
 548                 schedule_work(&dev->wq_trigger);
 549         }
 550
 551         return 0;
 552 }
 553
 554 static int snd_cx231xx_prepare(struct snd_pcm_substream *substream)
 555 {
 556         struct cx231xx *dev = snd_pcm_substream_chip(substream);
 557
 558         dev->adev.hwptr_done_capture = 0;
 559         dev->adev.capture_transfer_done = 0;
 560
 561         return 0;
 562 }
 563
 564 static void audio_trigger(struct work_struct *work)
 565 {
 566         struct cx231xx *dev = container_of(work, struct cx231xx, wq_trigger);
 567
 568         if (atomic_read(&dev->stream_started)) {
 569                 dev_dbg(dev->dev, "starting capture");
 570                 if (is_fw_load(dev) == 0)
 571                         cx25840_call(dev, core, load_fw);
 572                 if (dev->USE_ISO)
 573                         cx231xx_init_audio_isoc(dev);
 574                 else
 575                         cx231xx_init_audio_bulk(dev);
 576         } else {
 577                 dev_dbg(dev->dev, "stopping capture");
 578                 cx231xx_isoc_audio_deinit(dev);
 579         }
 580 }
 581
 582 static int snd_cx231xx_capture_trigger(struct snd_pcm_substream *substream,
 583                                        int cmd)
 584 {
 585         struct cx231xx *dev = snd_pcm_substream_chip(substream);
 586         int retval = 0;
 587
 588         if (dev->state & DEV_DISCONNECTED)
 589                 return -ENODEV;
 590
 591         spin_lock(&dev->adev.slock);
 592         switch (cmd) {
 593         case SNDRV_PCM_TRIGGER_START:
 594                 atomic_set(&dev->stream_started, 1);
 595                 break;
 596         case SNDRV_PCM_TRIGGER_STOP:
 597                 atomic_set(&dev->stream_started, 0);
 598                 break;
 599         default:
 600                 retval = -EINVAL;
 601                 break;
 602         }
 603         spin_unlock(&dev->adev.slock);
 604
 605         schedule_work(&dev->wq_trigger);
 606
 607         return retval;
 608 }
 609
 610 static snd_pcm_uframes_t snd_cx231xx_capture_pointer(struct snd_pcm_substream
 611                                                      *substream)
 612 {
 613         struct cx231xx *dev;
 614         unsigned long flags;
 615         snd_pcm_uframes_t hwptr_done;
 616
 617         dev = snd_pcm_substream_chip(substream);
 618
 619         spin_lock_irqsave(&dev->adev.slock, flags);
 620         hwptr_done = dev->adev.hwptr_done_capture;
 621         spin_unlock_irqrestore(&dev->adev.slock, flags);
 622
 623         return hwptr_done;
 624 }
 625
 626 static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
 627                                              unsigned long offset)
 628 {
 629         void *pageptr = subs->runtime->dma_area + offset;
 630
 631         return vmalloc_to_page(pageptr);
 632 }
 633
 634 static const struct snd_pcm_ops snd_cx231xx_pcm_capture = {
 635         .open = snd_cx231xx_capture_open,
 636         .close = snd_cx231xx_pcm_close,
 637         .ioctl = snd_pcm_lib_ioctl,
 638         .hw_params = snd_cx231xx_hw_capture_params,
 639         .hw_free = snd_cx231xx_hw_capture_free,
 640         .prepare = snd_cx231xx_prepare,
 641         .trigger = snd_cx231xx_capture_trigger,
 642         .pointer = snd_cx231xx_capture_pointer,
 643         .page = snd_pcm_get_vmalloc_page,
 644 };
 645
 646 static int cx231xx_audio_init(struct cx231xx *dev)
 647 {
 648         struct cx231xx_audio *adev = &dev->adev;
 649         struct snd_pcm *pcm;
 650         struct snd_card *card;
 651         static int devnr;
 652         int err;
 653         struct usb_interface *uif;
 654         int i, isoc_pipe = 0;
 655
 656         if (dev->has_alsa_audio != 1) {
 657                 /* This device does not support the extension (in this case
 658                    the device is expecting the snd-usb-audio module or
 659                    doesn't have analog audio support at all) */
 660                 return 0;
 661         }
 662
 663         dev_dbg(dev->dev,
 664                 "probing for cx231xx non standard usbaudio\n");
 665
 666         err = snd_card_new(dev->dev, index[devnr], "Cx231xx Audio",
 667                            THIS_MODULE, 0, &card);
 668         if (err < 0)
 669                 return err;
 670
 671         spin_lock_init(&adev->slock);
 672         err = snd_pcm_new(card, "Cx231xx Audio", 0, 0, 1, &pcm);
 673         if (err < 0) {
 674                 snd_card_free(card);
 675                 return err;
 676         }
 677
 678         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
 679                         &snd_cx231xx_pcm_capture);
 680         pcm->info_flags = 0;
 681         pcm->private_data = dev;
 682         strcpy(pcm->name, "Conexant cx231xx Capture");
 683         strcpy(card->driver, "Cx231xx-Audio");
 684         strcpy(card->shortname, "Cx231xx Audio");
 685         strcpy(card->longname, "Conexant cx231xx Audio");
 686
 687         INIT_WORK(&dev->wq_trigger, audio_trigger);
 688
 689         err = snd_card_register(card);
 690         if (err < 0) {
 691                 snd_card_free(card);
 692                 return err;
 693         }
 694         adev->sndcard = card;
 695         adev->udev = dev->udev;
 696
 697         /* compute alternate max packet sizes for Audio */
 698         uif =
 699             dev->udev->actconfig->interface[dev->current_pcb_config.
 700                                             hs_config_info[0].interface_info.
 701                                             audio_index + 1];
 702
 703         adev->end_point_addr =
 704             uif->altsetting[0].endpoint[isoc_pipe].desc.
 705                         bEndpointAddress;
 706
 707         adev->num_alt = uif->num_altsetting;
 708         dev_info(dev->dev,
 709                 "audio EndPoint Addr 0x%x, Alternate settings: %i\n",
 710                 adev->end_point_addr, adev->num_alt);
 711         adev->alt_max_pkt_size = kmalloc(32 * adev->num_alt, GFP_KERNEL);
 712
 713         if (adev->alt_max_pkt_size == NULL)
 714                 return -ENOMEM;
 715
 716         for (i = 0; i < adev->num_alt; i++) {
 717                 u16 tmp =
 718                     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
 730 static int cx231xx_audio_fini(struct cx231xx *dev)
 731 {
 732         if (dev == NULL)
 733                 return 0;
 734
 735         if (dev->has_alsa_audio != 1) {
 736                 /* This device does not support the extension (in this case
 737                    the device is expecting the snd-usb-audio module or
 738                    doesn't have analog audio support at all) */
 739                 return 0;
 740         }
 741
 742         if (dev->adev.sndcard) {
 743                 snd_card_free(dev->adev.sndcard);
 744                 kfree(dev->adev.alt_max_pkt_size);
 745                 dev->adev.sndcard = NULL;
 746         }
 747
 748         return 0;
 749 }
 750
 751 static struct cx231xx_ops audio_ops = {
 752         .id = CX231XX_AUDIO,
 753         .name = "Cx231xx Audio Extension",
 754         .init = cx231xx_audio_init,
 755         .fini = cx231xx_audio_fini,
 756 };
 757
 758 static int __init cx231xx_alsa_register(void)
 759 {
 760         return cx231xx_register_extension(&audio_ops);
 761 }
 762
 763 static void __exit cx231xx_alsa_unregister(void)
 764 {
 765         cx231xx_unregister_extension(&audio_ops);
 766 }
 767
 768 MODULE_LICENSE("GPL");
 769 MODULE_AUTHOR("Srinivasa Deevi <srinivasa.deevi@conexant.com>");
 770 MODULE_DESCRIPTION("Cx231xx Audio driver");
 771
 772 module_init(cx231xx_alsa_register);
 773 module_exit(cx231xx_alsa_unregister);