drivers/media/video/em28xx/em28xx-audio.c

   1 /*
   2  *  Empiatech em28x1 audio extension
   3  *
   4  *  Copyright (C) 2006 Markus Rechberger <mrechberger@gmail.com>
   5  *
   6  *  Copyright (C) 2007-2011 Mauro Carvalho Chehab <mchehab@redhat.com>
   7  *      - Port to work with the in-kernel driver
   8  *      - Cleanups, fixes, alsa-controls, etc.
   9  *
  10  *  This driver is based on my previous au600 usb pstn audio driver
  11  *  and inherits all the copyrights
  12  *
  13  *  This program is free software; you can redistribute it and/or modify
  14  *  it under the terms of the GNU General Public License as published by
  15  *  the Free Software Foundation; either version 2 of the License, or
  16  *  (at your option) any later version.
  17  *
  18  *  This program is distributed in the hope that it will be useful,
  19  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  *  GNU General Public License for more details.
  22  *
  23  *  You should have received a copy of the GNU General Public License
  24  *  along with this program; if not, write to the Free Software
  25  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  26  */
  27
  28 #include <linux/kernel.h>
  29 #include <linux/usb.h>
  30 #include <linux/init.h>
  31 #include <linux/sound.h>
  32 #include <linux/spinlock.h>
  33 #include <linux/soundcard.h>
  34 #include <linux/slab.h>
  35 #include <linux/vmalloc.h>
  36 #include <linux/proc_fs.h>
  37 #include <linux/module.h>
  38 #include <sound/core.h>
  39 #include <sound/pcm.h>
  40 #include <sound/pcm_params.h>
  41 #include <sound/info.h>
  42 #include <sound/initval.h>
  43 #include <sound/control.h>
  44 #include <sound/tlv.h>
  45 #include <media/v4l2-common.h>
  46 #include "em28xx.h"
  47
  48 static int debug;
  49 module_param(debug, int, 0644);
  50 MODULE_PARM_DESC(debug, "activates debug info");
  51
  52 #define dprintk(fmt, arg...) do {                                       \
  53             if (debug)                                                  \
  54                 printk(KERN_INFO "em28xx-audio %s: " fmt,               \
  55                                   __func__, ##arg);             \
  56         } while (0)
  57
  58 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
  59
  60 static int em28xx_deinit_isoc_audio(struct em28xx *dev)
  61 {
  62         int i;
  63
  64         dprintk("Stopping isoc\n");
  65         for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
  66                 if (!irqs_disabled())
  67                         usb_kill_urb(dev->adev.urb[i]);
  68                 else
  69                         usb_unlink_urb(dev->adev.urb[i]);
  70
  71                 usb_free_urb(dev->adev.urb[i]);
  72                 dev->adev.urb[i] = NULL;
  73
  74                 kfree(dev->adev.transfer_buffer[i]);
  75                 dev->adev.transfer_buffer[i] = NULL;
  76         }
  77
  78         return 0;
  79 }
  80
  81 static void em28xx_audio_isocirq(struct urb *urb)
  82 {
  83         struct em28xx            *dev = urb->context;
  84         int                      i;
  85         unsigned int             oldptr;
  86         int                      period_elapsed = 0;
  87         int                      status;
  88         unsigned char            *cp;
  89         unsigned int             stride;
  90         struct snd_pcm_substream *substream;
  91         struct snd_pcm_runtime   *runtime;
  92
  93         switch (urb->status) {
  94         case 0:             /* success */
  95         case -ETIMEDOUT:    /* NAK */
  96                 break;
  97         case -ECONNRESET:   /* kill */
  98         case -ENOENT:
  99         case -ESHUTDOWN:
 100                 return;
 101         default:            /* error */
 102                 dprintk("urb completition error %d.\n", urb->status);
 103                 break;
 104         }
 105
 106         if (atomic_read(&dev->stream_started) == 0)
 107                 return;
 108
 109         if (dev->adev.capture_pcm_substream) {
 110                 substream = dev->adev.capture_pcm_substream;
 111                 runtime = substream->runtime;
 112                 stride = runtime->frame_bits >> 3;
 113
 114                 for (i = 0; i < urb->number_of_packets; i++) {
 115                         int length =
 116                             urb->iso_frame_desc[i].actual_length / stride;
 117                         cp = (unsigned char *)urb->transfer_buffer +
 118                             urb->iso_frame_desc[i].offset;
 119
 120                         if (!length)
 121                                 continue;
 122
 123                         oldptr = dev->adev.hwptr_done_capture;
 124                         if (oldptr + length >= runtime->buffer_size) {
 125                                 unsigned int cnt =
 126                                     runtime->buffer_size - oldptr;
 127                                 memcpy(runtime->dma_area + oldptr * stride, cp,
 128                                        cnt * stride);
 129                                 memcpy(runtime->dma_area, cp + cnt * stride,
 130                                        length * stride - cnt * stride);
 131                         } else {
 132                                 memcpy(runtime->dma_area + oldptr * stride, cp,
 133                                        length * stride);
 134                         }
 135
 136                         snd_pcm_stream_lock(substream);
 137
 138                         dev->adev.hwptr_done_capture += length;
 139                         if (dev->adev.hwptr_done_capture >=
 140                             runtime->buffer_size)
 141                                 dev->adev.hwptr_done_capture -=
 142                                     runtime->buffer_size;
 143
 144                         dev->adev.capture_transfer_done += length;
 145                         if (dev->adev.capture_transfer_done >=
 146                             runtime->period_size) {
 147                                 dev->adev.capture_transfer_done -=
 148                                     runtime->period_size;
 149                                 period_elapsed = 1;
 150                         }
 151
 152                         snd_pcm_stream_unlock(substream);
 153                 }
 154                 if (period_elapsed)
 155                         snd_pcm_period_elapsed(substream);
 156         }
 157         urb->status = 0;
 158
 159         status = usb_submit_urb(urb, GFP_ATOMIC);
 160         if (status < 0) {
 161                 em28xx_errdev("resubmit of audio urb failed (error=%i)\n",
 162                               status);
 163         }
 164         return;
 165 }
 166
 167 static int em28xx_init_audio_isoc(struct em28xx *dev)
 168 {
 169         int       i, errCode;
 170         const int sb_size = EM28XX_NUM_AUDIO_PACKETS *
 171                             EM28XX_AUDIO_MAX_PACKET_SIZE;
 172
 173         dprintk("Starting isoc transfers\n");
 174
 175         for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
 176                 struct urb *urb;
 177                 int j, k;
 178
 179                 dev->adev.transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC);
 180                 if (!dev->adev.transfer_buffer[i])
 181                         return -ENOMEM;
 182
 183                 memset(dev->adev.transfer_buffer[i], 0x80, sb_size);
 184                 urb = usb_alloc_urb(EM28XX_NUM_AUDIO_PACKETS, GFP_ATOMIC);
 185                 if (!urb) {
 186                         em28xx_errdev("usb_alloc_urb failed!\n");
 187                         for (j = 0; j < i; j++) {
 188                                 usb_free_urb(dev->adev.urb[j]);
 189                                 kfree(dev->adev.transfer_buffer[j]);
 190                         }
 191                         return -ENOMEM;
 192                 }
 193
 194                 urb->dev = dev->udev;
 195                 urb->context = dev;
 196                 urb->pipe = usb_rcvisocpipe(dev->udev, 0x83);
 197                 urb->transfer_flags = URB_ISO_ASAP;
 198                 urb->transfer_buffer = dev->adev.transfer_buffer[i];
 199                 urb->interval = 1;
 200                 urb->complete = em28xx_audio_isocirq;
 201                 urb->number_of_packets = EM28XX_NUM_AUDIO_PACKETS;
 202                 urb->transfer_buffer_length = sb_size;
 203
 204                 for (j = k = 0; j < EM28XX_NUM_AUDIO_PACKETS;
 205                              j++, k += EM28XX_AUDIO_MAX_PACKET_SIZE) {
 206                         urb->iso_frame_desc[j].offset = k;
 207                         urb->iso_frame_desc[j].length =
 208                             EM28XX_AUDIO_MAX_PACKET_SIZE;
 209                 }
 210                 dev->adev.urb[i] = urb;
 211         }
 212
 213         for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
 214                 errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC);
 215                 if (errCode) {
 216                         em28xx_errdev("submit of audio urb failed\n");
 217                         em28xx_deinit_isoc_audio(dev);
 218                         atomic_set(&dev->stream_started, 0);
 219                         return errCode;
 220                 }
 221
 222         }
 223
 224         return 0;
 225 }
 226
 227 static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
 228                                         size_t size)
 229 {
 230         struct snd_pcm_runtime *runtime = subs->runtime;
 231
 232         dprintk("Allocating vbuffer\n");
 233         if (runtime->dma_area) {
 234                 if (runtime->dma_bytes > size)
 235                         return 0;
 236
 237                 vfree(runtime->dma_area);
 238         }
 239         runtime->dma_area = vmalloc(size);
 240         if (!runtime->dma_area)
 241                 return -ENOMEM;
 242
 243         runtime->dma_bytes = size;
 244
 245         return 0;
 246 }
 247
 248 static struct snd_pcm_hardware snd_em28xx_hw_capture = {
 249         .info = SNDRV_PCM_INFO_BLOCK_TRANSFER |
 250                 SNDRV_PCM_INFO_MMAP           |
 251                 SNDRV_PCM_INFO_INTERLEAVED    |
 252                 SNDRV_PCM_INFO_BATCH          |
 253                 SNDRV_PCM_INFO_MMAP_VALID,
 254
 255         .formats = SNDRV_PCM_FMTBIT_S16_LE,
 256
 257         .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_KNOT,
 258
 259         .rate_min = 48000,
 260         .rate_max = 48000,
 261         .channels_min = 2,
 262         .channels_max = 2,
 263         .buffer_bytes_max = 62720 * 8,  /* just about the value in usbaudio.c */
 264         .period_bytes_min = 64,         /* 12544/2, */
 265         .period_bytes_max = 12544,
 266         .periods_min = 2,
 267         .periods_max = 98,              /* 12544, */
 268 };
 269
 270 static int snd_em28xx_capture_open(struct snd_pcm_substream *substream)
 271 {
 272         struct em28xx *dev = snd_pcm_substream_chip(substream);
 273         struct snd_pcm_runtime *runtime = substream->runtime;
 274         int ret = 0;
 275
 276         dprintk("opening device and trying to acquire exclusive lock\n");
 277
 278         if (!dev) {
 279                 em28xx_err("BUG: em28xx can't find device struct."
 280                                 " Can't proceed with open\n");
 281                 return -ENODEV;
 282         }
 283
 284         runtime->hw = snd_em28xx_hw_capture;
 285         if ((dev->alt == 0 || dev->audio_ifnum) && dev->adev.users == 0) {
 286                 if (dev->audio_ifnum)
 287                         dev->alt = 1;
 288                 else
 289                         dev->alt = 7;
 290
 291                 dprintk("changing alternate number on interface %d to %d\n",
 292                         dev->audio_ifnum, dev->alt);
 293                 usb_set_interface(dev->udev, dev->audio_ifnum, dev->alt);
 294
 295                 /* Sets volume, mute, etc */
 296                 dev->mute = 0;
 297                 mutex_lock(&dev->lock);
 298                 ret = em28xx_audio_analog_set(dev);
 299                 if (ret < 0)
 300                         goto err;
 301
 302                 dev->adev.users++;
 303                 mutex_unlock(&dev->lock);
 304         }
 305
 306         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
 307         dev->adev.capture_pcm_substream = substream;
 308         runtime->private_data = dev;
 309
 310         return 0;
 311 err:
 312         mutex_unlock(&dev->lock);
 313
 314         em28xx_err("Error while configuring em28xx mixer\n");
 315         return ret;
 316 }
 317
 318 static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream)
 319 {
 320         struct em28xx *dev = snd_pcm_substream_chip(substream);
 321
 322         dprintk("closing device\n");
 323
 324         dev->mute = 1;
 325         mutex_lock(&dev->lock);
 326         dev->adev.users--;
 327         if (atomic_read(&dev->stream_started) > 0) {
 328                 atomic_set(&dev->stream_started, 0);
 329                 schedule_work(&dev->wq_trigger);
 330         }
 331
 332         em28xx_audio_analog_set(dev);
 333         if (substream->runtime->dma_area) {
 334                 dprintk("freeing\n");
 335                 vfree(substream->runtime->dma_area);
 336                 substream->runtime->dma_area = NULL;
 337         }
 338         mutex_unlock(&dev->lock);
 339
 340         return 0;
 341 }
 342
 343 static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream,
 344                                         struct snd_pcm_hw_params *hw_params)
 345 {
 346         unsigned int channels, rate, format;
 347         int ret;
 348
 349         dprintk("Setting capture parameters\n");
 350
 351         ret = snd_pcm_alloc_vmalloc_buffer(substream,
 352                                 params_buffer_bytes(hw_params));
 353         if (ret < 0)
 354                 return ret;
 355         format = params_format(hw_params);
 356         rate = params_rate(hw_params);
 357         channels = params_channels(hw_params);
 358
 359         /* TODO: set up em28xx audio chip to deliver the correct audio format,
 360            current default is 48000hz multiplexed => 96000hz mono
 361            which shouldn't matter since analogue TV only supports mono */
 362         return 0;
 363 }
 364
 365 static int snd_em28xx_hw_capture_free(struct snd_pcm_substream *substream)
 366 {
 367         struct em28xx *dev = snd_pcm_substream_chip(substream);
 368
 369         dprintk("Stop capture, if needed\n");
 370
 371         if (atomic_read(&dev->stream_started) > 0) {
 372                 atomic_set(&dev->stream_started, 0);
 373                 schedule_work(&dev->wq_trigger);
 374         }
 375
 376         return 0;
 377 }
 378
 379 static int snd_em28xx_prepare(struct snd_pcm_substream *substream)
 380 {
 381         struct em28xx *dev = snd_pcm_substream_chip(substream);
 382
 383         dev->adev.hwptr_done_capture = 0;
 384         dev->adev.capture_transfer_done = 0;
 385
 386         return 0;
 387 }
 388
 389 static void audio_trigger(struct work_struct *work)
 390 {
 391         struct em28xx *dev = container_of(work, struct em28xx, wq_trigger);
 392
 393         if (atomic_read(&dev->stream_started)) {
 394                 dprintk("starting capture");
 395                 em28xx_init_audio_isoc(dev);
 396         } else {
 397                 dprintk("stopping capture");
 398                 em28xx_deinit_isoc_audio(dev);
 399         }
 400 }
 401
 402 static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream,
 403                                       int cmd)
 404 {
 405         struct em28xx *dev = snd_pcm_substream_chip(substream);
 406         int retval = 0;
 407
 408         switch (cmd) {
 409         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */
 410         case SNDRV_PCM_TRIGGER_RESUME: /* fall through */
 411         case SNDRV_PCM_TRIGGER_START:
 412                 atomic_set(&dev->stream_started, 1);
 413                 break;
 414         case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */
 415         case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */
 416         case SNDRV_PCM_TRIGGER_STOP:
 417                 atomic_set(&dev->stream_started, 0);
 418                 break;
 419         default:
 420                 retval = -EINVAL;
 421         }
 422         schedule_work(&dev->wq_trigger);
 423         return retval;
 424 }
 425
 426 static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream
 427                                                     *substream)
 428 {
 429         unsigned long flags;
 430         struct em28xx *dev;
 431         snd_pcm_uframes_t hwptr_done;
 432
 433         dev = snd_pcm_substream_chip(substream);
 434         spin_lock_irqsave(&dev->adev.slock, flags);
 435         hwptr_done = dev->adev.hwptr_done_capture;
 436         spin_unlock_irqrestore(&dev->adev.slock, flags);
 437
 438         return hwptr_done;
 439 }
 440
 441 static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
 442                                              unsigned long offset)
 443 {
 444         void *pageptr = subs->runtime->dma_area + offset;
 445
 446         return vmalloc_to_page(pageptr);
 447 }
 448
 449 /*
 450  * AC97 volume control support
 451  */
 452 static int em28xx_vol_info(struct snd_kcontrol *kcontrol,
 453                                 struct snd_ctl_elem_info *info)
 454 {
 455         info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 456         info->count = 2;
 457         info->value.integer.min = 0;
 458         info->value.integer.max = 0x1f;
 459
 460         return 0;
 461 }
 462
 463 static int em28xx_vol_put(struct snd_kcontrol *kcontrol,
 464                                struct snd_ctl_elem_value *value)
 465 {
 466         struct em28xx *dev = snd_kcontrol_chip(kcontrol);
 467         u16 val = (0x1f - (value->value.integer.value[0] & 0x1f)) |
 468                   (0x1f - (value->value.integer.value[1] & 0x1f)) << 8;
 469         int rc;
 470
 471         mutex_lock(&dev->lock);
 472         rc = em28xx_read_ac97(dev, kcontrol->private_value);
 473         if (rc < 0)
 474                 goto err;
 475
 476         val |= rc & 0x8000;     /* Preserve the mute flag */
 477
 478         rc = em28xx_write_ac97(dev, kcontrol->private_value, val);
 479         if (rc < 0)
 480                 goto err;
 481
 482         dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n",
 483                 (val & 0x8000) ? "muted " : "",
 484                 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
 485                 val, (int)kcontrol->private_value);
 486
 487 err:
 488         mutex_unlock(&dev->lock);
 489         return rc;
 490 }
 491
 492 static int em28xx_vol_get(struct snd_kcontrol *kcontrol,
 493                                struct snd_ctl_elem_value *value)
 494 {
 495         struct em28xx *dev = snd_kcontrol_chip(kcontrol);
 496         int val;
 497
 498         mutex_lock(&dev->lock);
 499         val = em28xx_read_ac97(dev, kcontrol->private_value);
 500         mutex_unlock(&dev->lock);
 501         if (val < 0)
 502                 return val;
 503
 504         dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n",
 505                 (val & 0x8000) ? "muted " : "",
 506                 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
 507                 val, (int)kcontrol->private_value);
 508
 509         value->value.integer.value[0] = 0x1f - (val & 0x1f);
 510         value->value.integer.value[1] = 0x1f - ((val >> 8) & 0x1f);
 511
 512         return 0;
 513 }
 514
 515 static int em28xx_vol_put_mute(struct snd_kcontrol *kcontrol,
 516                                struct snd_ctl_elem_value *value)
 517 {
 518         struct em28xx *dev = snd_kcontrol_chip(kcontrol);
 519         u16 val = value->value.integer.value[0];
 520         int rc;
 521
 522         mutex_lock(&dev->lock);
 523         rc = em28xx_read_ac97(dev, kcontrol->private_value);
 524         if (rc < 0)
 525                 goto err;
 526
 527         if (val)
 528                 rc &= 0x1f1f;
 529         else
 530                 rc |= 0x8000;
 531
 532         rc = em28xx_write_ac97(dev, kcontrol->private_value, rc);
 533         if (rc < 0)
 534                 goto err;
 535
 536         dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n",
 537                 (val & 0x8000) ? "muted " : "",
 538                 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
 539                 val, (int)kcontrol->private_value);
 540
 541 err:
 542         mutex_unlock(&dev->lock);
 543         return rc;
 544 }
 545
 546 static int em28xx_vol_get_mute(struct snd_kcontrol *kcontrol,
 547                                struct snd_ctl_elem_value *value)
 548 {
 549         struct em28xx *dev = snd_kcontrol_chip(kcontrol);
 550         int val;
 551
 552         mutex_lock(&dev->lock);
 553         val = em28xx_read_ac97(dev, kcontrol->private_value);
 554         mutex_unlock(&dev->lock);
 555         if (val < 0)
 556                 return val;
 557
 558         if (val & 0x8000)
 559                 value->value.integer.value[0] = 0;
 560         else
 561                 value->value.integer.value[0] = 1;
 562
 563         dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n",
 564                 (val & 0x8000) ? "muted " : "",
 565                 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
 566                 val, (int)kcontrol->private_value);
 567
 568         return 0;
 569 }
 570
 571 static const DECLARE_TLV_DB_SCALE(em28xx_db_scale, -3450, 150, 0);
 572
 573 static int em28xx_cvol_new(struct snd_card *card, struct em28xx *dev,
 574                            char *name, int id)
 575 {
 576         int err;
 577         char ctl_name[44];
 578         struct snd_kcontrol *kctl;
 579         struct snd_kcontrol_new tmp;
 580
 581         memset (&tmp, 0, sizeof(tmp));
 582         tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 583         tmp.private_value = id,
 584         tmp.name  = ctl_name,
 585
 586         /* Add Mute Control */
 587         sprintf(ctl_name, "%s Switch", name);
 588         tmp.get  = em28xx_vol_get_mute;
 589         tmp.put  = em28xx_vol_put_mute;
 590         tmp.info = snd_ctl_boolean_mono_info;
 591         kctl = snd_ctl_new1(&tmp, dev);
 592         err = snd_ctl_add(card, kctl);
 593         if (err < 0)
 594                 return err;
 595         dprintk("Added control %s for ac97 volume control 0x%04x\n",
 596                 ctl_name, id);
 597
 598         memset (&tmp, 0, sizeof(tmp));
 599         tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 600         tmp.private_value = id,
 601         tmp.name  = ctl_name,
 602
 603         /* Add Volume Control */
 604         sprintf(ctl_name, "%s Volume", name);
 605         tmp.get   = em28xx_vol_get;
 606         tmp.put   = em28xx_vol_put;
 607         tmp.info  = em28xx_vol_info;
 608         tmp.tlv.p = em28xx_db_scale,
 609         kctl = snd_ctl_new1(&tmp, dev);
 610         err = snd_ctl_add(card, kctl);
 611         if (err < 0)
 612                 return err;
 613         dprintk("Added control %s for ac97 volume control 0x%04x\n",
 614                 ctl_name, id);
 615
 616         return 0;
 617 }
 618
 619 /*
 620  * register/unregister code and data
 621  */
 622 static struct snd_pcm_ops snd_em28xx_pcm_capture = {
 623         .open      = snd_em28xx_capture_open,
 624         .close     = snd_em28xx_pcm_close,
 625         .ioctl     = snd_pcm_lib_ioctl,
 626         .hw_params = snd_em28xx_hw_capture_params,
 627         .hw_free   = snd_em28xx_hw_capture_free,
 628         .prepare   = snd_em28xx_prepare,
 629         .trigger   = snd_em28xx_capture_trigger,
 630         .pointer   = snd_em28xx_capture_pointer,
 631         .page      = snd_pcm_get_vmalloc_page,
 632 };
 633
 634 static int em28xx_audio_init(struct em28xx *dev)
 635 {
 636         struct em28xx_audio *adev = &dev->adev;
 637         struct snd_pcm      *pcm;
 638         struct snd_card     *card;
 639         static int          devnr;
 640         int                 err;
 641
 642         if (!dev->has_alsa_audio || dev->audio_ifnum < 0) {
 643                 /* This device does not support the extension (in this case
 644                    the device is expecting the snd-usb-audio module or
 645                    doesn't have analog audio support at all) */
 646                 return 0;
 647         }
 648
 649         printk(KERN_INFO "em28xx-audio.c: probing for em28xx Audio Vendor Class\n");
 650         printk(KERN_INFO "em28xx-audio.c: Copyright (C) 2006 Markus "
 651                          "Rechberger\n");
 652         printk(KERN_INFO "em28xx-audio.c: Copyright (C) 2007-2011 Mauro Carvalho Chehab\n");
 653
 654         err = snd_card_create(index[devnr], "Em28xx Audio", THIS_MODULE, 0,
 655                               &card);
 656         if (err < 0)
 657                 return err;
 658
 659         spin_lock_init(&adev->slock);
 660         err = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm);
 661         if (err < 0) {
 662                 snd_card_free(card);
 663                 return err;
 664         }
 665
 666         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_em28xx_pcm_capture);
 667         pcm->info_flags = 0;
 668         pcm->private_data = dev;
 669         strcpy(pcm->name, "Empia 28xx Capture");
 670
 671         snd_card_set_dev(card, &dev->udev->dev);
 672         strcpy(card->driver, "Em28xx-Audio");
 673         strcpy(card->shortname, "Em28xx Audio");
 674         strcpy(card->longname, "Empia Em28xx Audio");
 675
 676         INIT_WORK(&dev->wq_trigger, audio_trigger);
 677
 678         if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {
 679                 em28xx_cvol_new(card, dev, "Video", AC97_VIDEO_VOL);
 680                 em28xx_cvol_new(card, dev, "Line In", AC97_LINEIN_VOL);
 681                 em28xx_cvol_new(card, dev, "Phone", AC97_PHONE_VOL);
 682                 em28xx_cvol_new(card, dev, "Microphone", AC97_PHONE_VOL);
 683                 em28xx_cvol_new(card, dev, "CD", AC97_CD_VOL);
 684                 em28xx_cvol_new(card, dev, "AUX", AC97_AUX_VOL);
 685                 em28xx_cvol_new(card, dev, "PCM", AC97_PCM_OUT_VOL);
 686
 687                 em28xx_cvol_new(card, dev, "Master", AC97_MASTER_VOL);
 688                 em28xx_cvol_new(card, dev, "Line", AC97_LINE_LEVEL_VOL);
 689                 em28xx_cvol_new(card, dev, "Mono", AC97_MASTER_MONO_VOL);
 690                 em28xx_cvol_new(card, dev, "LFE", AC97_LFE_MASTER_VOL);
 691                 em28xx_cvol_new(card, dev, "Surround", AC97_SURR_MASTER_VOL);
 692         }
 693
 694         err = snd_card_register(card);
 695         if (err < 0) {
 696                 snd_card_free(card);
 697                 return err;
 698         }
 699         adev->sndcard = card;
 700         adev->udev = dev->udev;
 701
 702         return 0;
 703 }
 704
 705 static int em28xx_audio_fini(struct em28xx *dev)
 706 {
 707         if (dev == NULL)
 708                 return 0;
 709
 710         if (dev->has_alsa_audio != 1) {
 711                 /* This device does not support the extension (in this case
 712                    the device is expecting the snd-usb-audio module or
 713                    doesn't have analog audio support at all) */
 714                 return 0;
 715         }
 716
 717         if (dev->adev.sndcard) {
 718                 snd_card_free(dev->adev.sndcard);
 719                 dev->adev.sndcard = NULL;
 720         }
 721
 722         return 0;
 723 }
 724
 725 static struct em28xx_ops audio_ops = {
 726         .id   = EM28XX_AUDIO,
 727         .name = "Em28xx Audio Extension",
 728         .init = em28xx_audio_init,
 729         .fini = em28xx_audio_fini,
 730 };
 731
 732 static int __init em28xx_alsa_register(void)
 733 {
 734         return em28xx_register_extension(&audio_ops);
 735 }
 736
 737 static void __exit em28xx_alsa_unregister(void)
 738 {
 739         em28xx_unregister_extension(&audio_ops);
 740 }
 741
 742 MODULE_LICENSE("GPL");
 743 MODULE_AUTHOR("Markus Rechberger <mrechberger@gmail.com>");
 744 MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@redhat.com>");
 745 MODULE_DESCRIPTION("Em28xx Audio driver");
 746
 747 module_init(em28xx_alsa_register);
 748 module_exit(em28xx_alsa_unregister);