drivers/media/usb/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 <sound/ac97_codec.h>
  46 #include <media/v4l2-common.h>
  47 #include "em28xx.h"
  48
  49 static int debug;
  50 module_param(debug, int, 0644);
  51 MODULE_PARM_DESC(debug, "activates debug info");
  52
  53 #define dprintk(fmt, arg...) do {                                       \
  54             if (debug)                                                  \
  55                 printk(KERN_INFO "em28xx-audio %s: " fmt,               \
  56                                   __func__, ##arg);             \
  57         } while (0)
  58
  59 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
  60
  61 static int em28xx_deinit_isoc_audio(struct em28xx *dev)
  62 {
  63         int i;
  64
  65         dprintk("Stopping isoc\n");
  66         for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
  67                 if (!irqs_disabled())
  68                         usb_kill_urb(dev->adev.urb[i]);
  69                 else
  70                         usb_unlink_urb(dev->adev.urb[i]);
  71
  72                 usb_free_urb(dev->adev.urb[i]);
  73                 dev->adev.urb[i] = NULL;
  74
  75                 kfree(dev->adev.transfer_buffer[i]);
  76                 dev->adev.transfer_buffer[i] = NULL;
  77         }
  78
  79         return 0;
  80 }
  81
  82 static void em28xx_audio_isocirq(struct urb *urb)
  83 {
  84         struct em28xx            *dev = urb->context;
  85         int                      i;
  86         unsigned int             oldptr;
  87         int                      period_elapsed = 0;
  88         int                      status;
  89         unsigned char            *cp;
  90         unsigned int             stride;
  91         struct snd_pcm_substream *substream;
  92         struct snd_pcm_runtime   *runtime;
  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                 dprintk("urb completition error %d.\n", urb->status);
 104                 break;
 105         }
 106
 107         if (atomic_read(&dev->stream_started) == 0)
 108                 return;
 109
 110         if (dev->adev.capture_pcm_substream) {
 111                 substream = dev->adev.capture_pcm_substream;
 112                 runtime = substream->runtime;
 113                 stride = runtime->frame_bits >> 3;
 114
 115                 for (i = 0; i < urb->number_of_packets; i++) {
 116                         int length =
 117                             urb->iso_frame_desc[i].actual_length / stride;
 118                         cp = (unsigned char *)urb->transfer_buffer +
 119                             urb->iso_frame_desc[i].offset;
 120
 121                         if (!length)
 122                                 continue;
 123
 124                         oldptr = dev->adev.hwptr_done_capture;
 125                         if (oldptr + length >= runtime->buffer_size) {
 126                                 unsigned int cnt =
 127                                     runtime->buffer_size - oldptr;
 128                                 memcpy(runtime->dma_area + oldptr * stride, cp,
 129                                        cnt * stride);
 130                                 memcpy(runtime->dma_area, cp + cnt * stride,
 131                                        length * stride - cnt * stride);
 132                         } else {
 133                                 memcpy(runtime->dma_area + oldptr * stride, cp,
 134                                        length * stride);
 135                         }
 136
 137                         snd_pcm_stream_lock(substream);
 138
 139                         dev->adev.hwptr_done_capture += length;
 140                         if (dev->adev.hwptr_done_capture >=
 141                             runtime->buffer_size)
 142                                 dev->adev.hwptr_done_capture -=
 143                                     runtime->buffer_size;
 144
 145                         dev->adev.capture_transfer_done += length;
 146                         if (dev->adev.capture_transfer_done >=
 147                             runtime->period_size) {
 148                                 dev->adev.capture_transfer_done -=
 149                                     runtime->period_size;
 150                                 period_elapsed = 1;
 151                         }
 152
 153                         snd_pcm_stream_unlock(substream);
 154                 }
 155                 if (period_elapsed)
 156                         snd_pcm_period_elapsed(substream);
 157         }
 158         urb->status = 0;
 159
 160         status = usb_submit_urb(urb, GFP_ATOMIC);
 161         if (status < 0) {
 162                 em28xx_errdev("resubmit of audio urb failed (error=%i)\n",
 163                               status);
 164         }
 165         return;
 166 }
 167
 168 static int em28xx_init_audio_isoc(struct em28xx *dev)
 169 {
 170         int       i, errCode;
 171         const int sb_size = EM28XX_NUM_AUDIO_PACKETS *
 172                             EM28XX_AUDIO_MAX_PACKET_SIZE;
 173
 174         dprintk("Starting isoc transfers\n");
 175
 176         for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
 177                 struct urb *urb;
 178                 int j, k;
 179
 180                 dev->adev.transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC);
 181                 if (!dev->adev.transfer_buffer[i])
 182                         return -ENOMEM;
 183
 184                 memset(dev->adev.transfer_buffer[i], 0x80, sb_size);
 185                 urb = usb_alloc_urb(EM28XX_NUM_AUDIO_PACKETS, GFP_ATOMIC);
 186                 if (!urb) {
 187                         em28xx_errdev("usb_alloc_urb failed!\n");
 188                         for (j = 0; j < i; j++) {
 189                                 usb_free_urb(dev->adev.urb[j]);
 190                                 kfree(dev->adev.transfer_buffer[j]);
 191                         }
 192                         return -ENOMEM;
 193                 }
 194
 195                 urb->dev = dev->udev;
 196                 urb->context = dev;
 197                 urb->pipe = usb_rcvisocpipe(dev->udev, EM28XX_EP_AUDIO);
 198                 urb->transfer_flags = URB_ISO_ASAP;
 199                 urb->transfer_buffer = dev->adev.transfer_buffer[i];
 200                 urb->interval = 1;
 201                 urb->complete = em28xx_audio_isocirq;
 202                 urb->number_of_packets = EM28XX_NUM_AUDIO_PACKETS;
 203                 urb->transfer_buffer_length = sb_size;
 204
 205                 for (j = k = 0; j < EM28XX_NUM_AUDIO_PACKETS;
 206                              j++, k += EM28XX_AUDIO_MAX_PACKET_SIZE) {
 207                         urb->iso_frame_desc[j].offset = k;
 208                         urb->iso_frame_desc[j].length =
 209                             EM28XX_AUDIO_MAX_PACKET_SIZE;
 210                 }
 211                 dev->adev.urb[i] = urb;
 212         }
 213
 214         for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
 215                 errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC);
 216                 if (errCode) {
 217                         em28xx_errdev("submit of audio urb failed\n");
 218                         em28xx_deinit_isoc_audio(dev);
 219                         atomic_set(&dev->stream_started, 0);
 220                         return errCode;
 221                 }
 222
 223         }
 224
 225         return 0;
 226 }
 227
 228 static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
 229                                         size_t size)
 230 {
 231         struct snd_pcm_runtime *runtime = subs->runtime;
 232
 233         dprintk("Allocating vbuffer\n");
 234         if (runtime->dma_area) {
 235                 if (runtime->dma_bytes > size)
 236                         return 0;
 237
 238                 vfree(runtime->dma_area);
 239         }
 240         runtime->dma_area = vmalloc(size);
 241         if (!runtime->dma_area)
 242                 return -ENOMEM;
 243
 244         runtime->dma_bytes = size;
 245
 246         return 0;
 247 }
 248
 249 static struct snd_pcm_hardware snd_em28xx_hw_capture = {
 250         .info = SNDRV_PCM_INFO_BLOCK_TRANSFER |
 251                 SNDRV_PCM_INFO_MMAP           |
 252                 SNDRV_PCM_INFO_INTERLEAVED    |
 253                 SNDRV_PCM_INFO_BATCH          |
 254                 SNDRV_PCM_INFO_MMAP_VALID,
 255
 256         .formats = SNDRV_PCM_FMTBIT_S16_LE,
 257
 258         .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_KNOT,
 259
 260         .rate_min = 48000,
 261         .rate_max = 48000,
 262         .channels_min = 2,
 263         .channels_max = 2,
 264         .buffer_bytes_max = 62720 * 8,  /* just about the value in usbaudio.c */
 265         .period_bytes_min = 64,         /* 12544/2, */
 266         .period_bytes_max = 12544,
 267         .periods_min = 2,
 268         .periods_max = 98,              /* 12544, */
 269 };
 270
 271 static int snd_em28xx_capture_open(struct snd_pcm_substream *substream)
 272 {
 273         struct em28xx *dev = snd_pcm_substream_chip(substream);
 274         struct snd_pcm_runtime *runtime = substream->runtime;
 275         int ret = 0;
 276
 277         dprintk("opening device and trying to acquire exclusive lock\n");
 278
 279         if (!dev) {
 280                 em28xx_err("BUG: em28xx can't find device struct."
 281                                 " Can't proceed with open\n");
 282                 return -ENODEV;
 283         }
 284
 285         runtime->hw = snd_em28xx_hw_capture;
 286         if ((dev->alt == 0 || dev->audio_ifnum) && dev->adev.users == 0) {
 287                 if (dev->audio_ifnum)
 288                         dev->alt = 1;
 289                 else
 290                         dev->alt = 7;
 291
 292                 dprintk("changing alternate number on interface %d to %d\n",
 293                         dev->audio_ifnum, dev->alt);
 294                 usb_set_interface(dev->udev, dev->audio_ifnum, dev->alt);
 295
 296                 /* Sets volume, mute, etc */
 297                 dev->mute = 0;
 298                 mutex_lock(&dev->lock);
 299                 ret = em28xx_audio_analog_set(dev);
 300                 if (ret < 0)
 301                         goto err;
 302
 303                 dev->adev.users++;
 304                 mutex_unlock(&dev->lock);
 305         }
 306
 307         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
 308         dev->adev.capture_pcm_substream = substream;
 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         int ret;
 347
 348         dprintk("Setting capture parameters\n");
 349
 350         ret = snd_pcm_alloc_vmalloc_buffer(substream,
 351                                 params_buffer_bytes(hw_params));
 352         if (ret < 0)
 353                 return ret;
 354 #if 0
 355         /* TODO: set up em28xx audio chip to deliver the correct audio format,
 356            current default is 48000hz multiplexed => 96000hz mono
 357            which shouldn't matter since analogue TV only supports mono */
 358         unsigned int channels, rate, format;
 359
 360         format = params_format(hw_params);
 361         rate = params_rate(hw_params);
 362         channels = params_channels(hw_params);
 363 #endif
 364
 365         return 0;
 366 }
 367
 368 static int snd_em28xx_hw_capture_free(struct snd_pcm_substream *substream)
 369 {
 370         struct em28xx *dev = snd_pcm_substream_chip(substream);
 371
 372         dprintk("Stop capture, if needed\n");
 373
 374         if (atomic_read(&dev->stream_started) > 0) {
 375                 atomic_set(&dev->stream_started, 0);
 376                 schedule_work(&dev->wq_trigger);
 377         }
 378
 379         return 0;
 380 }
 381
 382 static int snd_em28xx_prepare(struct snd_pcm_substream *substream)
 383 {
 384         struct em28xx *dev = snd_pcm_substream_chip(substream);
 385
 386         dev->adev.hwptr_done_capture = 0;
 387         dev->adev.capture_transfer_done = 0;
 388
 389         return 0;
 390 }
 391
 392 static void audio_trigger(struct work_struct *work)
 393 {
 394         struct em28xx *dev = container_of(work, struct em28xx, wq_trigger);
 395
 396         if (atomic_read(&dev->stream_started)) {
 397                 dprintk("starting capture");
 398                 em28xx_init_audio_isoc(dev);
 399         } else {
 400                 dprintk("stopping capture");
 401                 em28xx_deinit_isoc_audio(dev);
 402         }
 403 }
 404
 405 static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream,
 406                                       int cmd)
 407 {
 408         struct em28xx *dev = snd_pcm_substream_chip(substream);
 409         int retval = 0;
 410
 411         switch (cmd) {
 412         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */
 413         case SNDRV_PCM_TRIGGER_RESUME: /* fall through */
 414         case SNDRV_PCM_TRIGGER_START:
 415                 atomic_set(&dev->stream_started, 1);
 416                 break;
 417         case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */
 418         case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */
 419         case SNDRV_PCM_TRIGGER_STOP:
 420                 atomic_set(&dev->stream_started, 0);
 421                 break;
 422         default:
 423                 retval = -EINVAL;
 424         }
 425         schedule_work(&dev->wq_trigger);
 426         return retval;
 427 }
 428
 429 static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream
 430                                                     *substream)
 431 {
 432         unsigned long flags;
 433         struct em28xx *dev;
 434         snd_pcm_uframes_t hwptr_done;
 435
 436         dev = snd_pcm_substream_chip(substream);
 437         spin_lock_irqsave(&dev->adev.slock, flags);
 438         hwptr_done = dev->adev.hwptr_done_capture;
 439         spin_unlock_irqrestore(&dev->adev.slock, flags);
 440
 441         return hwptr_done;
 442 }
 443
 444 static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
 445                                              unsigned long offset)
 446 {
 447         void *pageptr = subs->runtime->dma_area + offset;
 448
 449         return vmalloc_to_page(pageptr);
 450 }
 451
 452 /*
 453  * AC97 volume control support
 454  */
 455 static int em28xx_vol_info(struct snd_kcontrol *kcontrol,
 456                                 struct snd_ctl_elem_info *info)
 457 {
 458         info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 459         info->count = 2;
 460         info->value.integer.min = 0;
 461         info->value.integer.max = 0x1f;
 462
 463         return 0;
 464 }
 465
 466 static int em28xx_vol_put(struct snd_kcontrol *kcontrol,
 467                                struct snd_ctl_elem_value *value)
 468 {
 469         struct em28xx *dev = snd_kcontrol_chip(kcontrol);
 470         u16 val = (0x1f - (value->value.integer.value[0] & 0x1f)) |
 471                   (0x1f - (value->value.integer.value[1] & 0x1f)) << 8;
 472         int rc;
 473
 474         mutex_lock(&dev->lock);
 475         rc = em28xx_read_ac97(dev, kcontrol->private_value);
 476         if (rc < 0)
 477                 goto err;
 478
 479         val |= rc & 0x8000;     /* Preserve the mute flag */
 480
 481         rc = em28xx_write_ac97(dev, kcontrol->private_value, val);
 482         if (rc < 0)
 483                 goto err;
 484
 485         dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n",
 486                 (val & 0x8000) ? "muted " : "",
 487                 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
 488                 val, (int)kcontrol->private_value);
 489
 490 err:
 491         mutex_unlock(&dev->lock);
 492         return rc;
 493 }
 494
 495 static int em28xx_vol_get(struct snd_kcontrol *kcontrol,
 496                                struct snd_ctl_elem_value *value)
 497 {
 498         struct em28xx *dev = snd_kcontrol_chip(kcontrol);
 499         int val;
 500
 501         mutex_lock(&dev->lock);
 502         val = em28xx_read_ac97(dev, kcontrol->private_value);
 503         mutex_unlock(&dev->lock);
 504         if (val < 0)
 505                 return val;
 506
 507         dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n",
 508                 (val & 0x8000) ? "muted " : "",
 509                 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
 510                 val, (int)kcontrol->private_value);
 511
 512         value->value.integer.value[0] = 0x1f - (val & 0x1f);
 513         value->value.integer.value[1] = 0x1f - ((val << 8) & 0x1f);
 514
 515         return 0;
 516 }
 517
 518 static int em28xx_vol_put_mute(struct snd_kcontrol *kcontrol,
 519                                struct snd_ctl_elem_value *value)
 520 {
 521         struct em28xx *dev = snd_kcontrol_chip(kcontrol);
 522         u16 val = value->value.integer.value[0];
 523         int rc;
 524
 525         mutex_lock(&dev->lock);
 526         rc = em28xx_read_ac97(dev, kcontrol->private_value);
 527         if (rc < 0)
 528                 goto err;
 529
 530         if (val)
 531                 rc &= 0x1f1f;
 532         else
 533                 rc |= 0x8000;
 534
 535         rc = em28xx_write_ac97(dev, kcontrol->private_value, rc);
 536         if (rc < 0)
 537                 goto err;
 538
 539         dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n",
 540                 (val & 0x8000) ? "muted " : "",
 541                 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
 542                 val, (int)kcontrol->private_value);
 543
 544 err:
 545         mutex_unlock(&dev->lock);
 546         return rc;
 547 }
 548
 549 static int em28xx_vol_get_mute(struct snd_kcontrol *kcontrol,
 550                                struct snd_ctl_elem_value *value)
 551 {
 552         struct em28xx *dev = snd_kcontrol_chip(kcontrol);
 553         int val;
 554
 555         mutex_lock(&dev->lock);
 556         val = em28xx_read_ac97(dev, kcontrol->private_value);
 557         mutex_unlock(&dev->lock);
 558         if (val < 0)
 559                 return val;
 560
 561         if (val & 0x8000)
 562                 value->value.integer.value[0] = 0;
 563         else
 564                 value->value.integer.value[0] = 1;
 565
 566         dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n",
 567                 (val & 0x8000) ? "muted " : "",
 568                 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
 569                 val, (int)kcontrol->private_value);
 570
 571         return 0;
 572 }
 573
 574 static const DECLARE_TLV_DB_SCALE(em28xx_db_scale, -3450, 150, 0);
 575
 576 static int em28xx_cvol_new(struct snd_card *card, struct em28xx *dev,
 577                            char *name, int id)
 578 {
 579         int err;
 580         char ctl_name[44];
 581         struct snd_kcontrol *kctl;
 582         struct snd_kcontrol_new tmp;
 583
 584         memset (&tmp, 0, sizeof(tmp));
 585         tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 586         tmp.private_value = id,
 587         tmp.name  = ctl_name,
 588
 589         /* Add Mute Control */
 590         sprintf(ctl_name, "%s Switch", name);
 591         tmp.get  = em28xx_vol_get_mute;
 592         tmp.put  = em28xx_vol_put_mute;
 593         tmp.info = snd_ctl_boolean_mono_info;
 594         kctl = snd_ctl_new1(&tmp, dev);
 595         err = snd_ctl_add(card, kctl);
 596         if (err < 0)
 597                 return err;
 598         dprintk("Added control %s for ac97 volume control 0x%04x\n",
 599                 ctl_name, id);
 600
 601         memset (&tmp, 0, sizeof(tmp));
 602         tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 603         tmp.private_value = id,
 604         tmp.name  = ctl_name,
 605
 606         /* Add Volume Control */
 607         sprintf(ctl_name, "%s Volume", name);
 608         tmp.get   = em28xx_vol_get;
 609         tmp.put   = em28xx_vol_put;
 610         tmp.info  = em28xx_vol_info;
 611         tmp.tlv.p = em28xx_db_scale,
 612         kctl = snd_ctl_new1(&tmp, dev);
 613         err = snd_ctl_add(card, kctl);
 614         if (err < 0)
 615                 return err;
 616         dprintk("Added control %s for ac97 volume control 0x%04x\n",
 617                 ctl_name, id);
 618
 619         return 0;
 620 }
 621
 622 /*
 623  * register/unregister code and data
 624  */
 625 static struct snd_pcm_ops snd_em28xx_pcm_capture = {
 626         .open      = snd_em28xx_capture_open,
 627         .close     = snd_em28xx_pcm_close,
 628         .ioctl     = snd_pcm_lib_ioctl,
 629         .hw_params = snd_em28xx_hw_capture_params,
 630         .hw_free   = snd_em28xx_hw_capture_free,
 631         .prepare   = snd_em28xx_prepare,
 632         .trigger   = snd_em28xx_capture_trigger,
 633         .pointer   = snd_em28xx_capture_pointer,
 634         .page      = snd_pcm_get_vmalloc_page,
 635 };
 636
 637 static int em28xx_audio_init(struct em28xx *dev)
 638 {
 639         struct em28xx_audio *adev = &dev->adev;
 640         struct snd_pcm      *pcm;
 641         struct snd_card     *card;
 642         static int          devnr;
 643         int                 err;
 644
 645         if (!dev->has_alsa_audio || dev->audio_ifnum < 0) {
 646                 /* This device does not support the extension (in this case
 647                    the device is expecting the snd-usb-audio module or
 648                    doesn't have analog audio support at all) */
 649                 return 0;
 650         }
 651
 652         printk(KERN_INFO "em28xx-audio.c: probing for em28xx Audio Vendor Class\n");
 653         printk(KERN_INFO "em28xx-audio.c: Copyright (C) 2006 Markus "
 654                          "Rechberger\n");
 655         printk(KERN_INFO "em28xx-audio.c: Copyright (C) 2007-2011 Mauro Carvalho Chehab\n");
 656
 657         err = snd_card_create(index[devnr], "Em28xx Audio", THIS_MODULE, 0,
 658                               &card);
 659         if (err < 0)
 660                 return err;
 661
 662         spin_lock_init(&adev->slock);
 663         err = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm);
 664         if (err < 0) {
 665                 snd_card_free(card);
 666                 return err;
 667         }
 668
 669         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_em28xx_pcm_capture);
 670         pcm->info_flags = 0;
 671         pcm->private_data = dev;
 672         strcpy(pcm->name, "Empia 28xx Capture");
 673
 674         snd_card_set_dev(card, &dev->udev->dev);
 675         strcpy(card->driver, "Em28xx-Audio");
 676         strcpy(card->shortname, "Em28xx Audio");
 677         strcpy(card->longname, "Empia Em28xx Audio");
 678
 679         INIT_WORK(&dev->wq_trigger, audio_trigger);
 680
 681         if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {
 682                 em28xx_cvol_new(card, dev, "Video", AC97_VIDEO);
 683                 em28xx_cvol_new(card, dev, "Line In", AC97_LINE);
 684                 em28xx_cvol_new(card, dev, "Phone", AC97_PHONE);
 685                 em28xx_cvol_new(card, dev, "Microphone", AC97_MIC);
 686                 em28xx_cvol_new(card, dev, "CD", AC97_CD);
 687                 em28xx_cvol_new(card, dev, "AUX", AC97_AUX);
 688                 em28xx_cvol_new(card, dev, "PCM", AC97_PCM);
 689
 690                 em28xx_cvol_new(card, dev, "Master", AC97_MASTER);
 691                 em28xx_cvol_new(card, dev, "Line", AC97_HEADPHONE);
 692                 em28xx_cvol_new(card, dev, "Mono", AC97_MASTER_MONO);
 693                 em28xx_cvol_new(card, dev, "LFE", AC97_CENTER_LFE_MASTER);
 694                 em28xx_cvol_new(card, dev, "Surround", AC97_SURROUND_MASTER);
 695         }
 696
 697         err = snd_card_register(card);
 698         if (err < 0) {
 699                 snd_card_free(card);
 700                 return err;
 701         }
 702         adev->sndcard = card;
 703         adev->udev = dev->udev;
 704
 705         return 0;
 706 }
 707
 708 static int em28xx_audio_fini(struct em28xx *dev)
 709 {
 710         if (dev == NULL)
 711                 return 0;
 712
 713         if (dev->has_alsa_audio != 1) {
 714                 /* This device does not support the extension (in this case
 715                    the device is expecting the snd-usb-audio module or
 716                    doesn't have analog audio support at all) */
 717                 return 0;
 718         }
 719
 720         if (dev->adev.sndcard) {
 721                 snd_card_free(dev->adev.sndcard);
 722                 dev->adev.sndcard = NULL;
 723         }
 724
 725         return 0;
 726 }
 727
 728 static struct em28xx_ops audio_ops = {
 729         .id   = EM28XX_AUDIO,
 730         .name = "Em28xx Audio Extension",
 731         .init = em28xx_audio_init,
 732         .fini = em28xx_audio_fini,
 733 };
 734
 735 static int __init em28xx_alsa_register(void)
 736 {
 737         return em28xx_register_extension(&audio_ops);
 738 }
 739
 740 static void __exit em28xx_alsa_unregister(void)
 741 {
 742         em28xx_unregister_extension(&audio_ops);
 743 }
 744
 745 MODULE_LICENSE("GPL");
 746 MODULE_AUTHOR("Markus Rechberger <mrechberger@gmail.com>");
 747 MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@redhat.com>");
 748 MODULE_DESCRIPTION("Em28xx Audio driver");
 749
 750 module_init(em28xx_alsa_register);
 751 module_exit(em28xx_alsa_unregister);