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) 2007-2014 Mauro Carvalho Chehab
   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 EM28XX_MAX_AUDIO_BUFS           5
  54 #define EM28XX_MIN_AUDIO_PACKETS        64
  55
  56 #define dprintk(fmt, arg...) do {                                       \
  57             if (debug)                                                  \
  58                 printk(KERN_INFO "em28xx-audio %s: " fmt,               \
  59                                   __func__, ##arg);             \
  60         } while (0)
  61
  62 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
  63
  64 static int em28xx_deinit_isoc_audio(struct em28xx *dev)
  65 {
  66         int i;
  67
  68         dprintk("Stopping isoc\n");
  69         for (i = 0; i < dev->adev.num_urb; i++) {
  70                 struct urb *urb = dev->adev.urb[i];
  71
  72                 if (!irqs_disabled())
  73                         usb_kill_urb(urb);
  74                 else
  75                         usb_unlink_urb(urb);
  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         if (dev->disconnected) {
  94                 dprintk("device disconnected while streaming. URB status=%d.\n", urb->status);
  95                 atomic_set(&dev->stream_started, 0);
  96                 return;
  97         }
  98
  99         switch (urb->status) {
 100         case 0:             /* success */
 101         case -ETIMEDOUT:    /* NAK */
 102                 break;
 103         case -ECONNRESET:   /* kill */
 104         case -ENOENT:
 105         case -ESHUTDOWN:
 106                 return;
 107         default:            /* error */
 108                 dprintk("urb completition error %d.\n", urb->status);
 109                 break;
 110         }
 111
 112         if (atomic_read(&dev->stream_started) == 0)
 113                 return;
 114
 115         if (dev->adev.capture_pcm_substream) {
 116                 substream = dev->adev.capture_pcm_substream;
 117                 runtime = substream->runtime;
 118                 stride = runtime->frame_bits >> 3;
 119
 120                 for (i = 0; i < urb->number_of_packets; i++) {
 121                         int length =
 122                             urb->iso_frame_desc[i].actual_length / stride;
 123                         cp = (unsigned char *)urb->transfer_buffer +
 124                             urb->iso_frame_desc[i].offset;
 125
 126                         if (!length)
 127                                 continue;
 128
 129                         oldptr = dev->adev.hwptr_done_capture;
 130                         if (oldptr + length >= runtime->buffer_size) {
 131                                 unsigned int cnt =
 132                                     runtime->buffer_size - oldptr;
 133                                 memcpy(runtime->dma_area + oldptr * stride, cp,
 134                                        cnt * stride);
 135                                 memcpy(runtime->dma_area, cp + cnt * stride,
 136                                        length * stride - cnt * stride);
 137                         } else {
 138                                 memcpy(runtime->dma_area + oldptr * stride, cp,
 139                                        length * stride);
 140                         }
 141
 142                         snd_pcm_stream_lock(substream);
 143
 144                         dev->adev.hwptr_done_capture += length;
 145                         if (dev->adev.hwptr_done_capture >=
 146                             runtime->buffer_size)
 147                                 dev->adev.hwptr_done_capture -=
 148                                     runtime->buffer_size;
 149
 150                         dev->adev.capture_transfer_done += length;
 151                         if (dev->adev.capture_transfer_done >=
 152                             runtime->period_size) {
 153                                 dev->adev.capture_transfer_done -=
 154                                     runtime->period_size;
 155                                 period_elapsed = 1;
 156                         }
 157
 158                         snd_pcm_stream_unlock(substream);
 159                 }
 160                 if (period_elapsed)
 161                         snd_pcm_period_elapsed(substream);
 162         }
 163         urb->status = 0;
 164
 165         status = usb_submit_urb(urb, GFP_ATOMIC);
 166         if (status < 0)
 167                 em28xx_errdev("resubmit of audio urb failed (error=%i)\n",
 168                               status);
 169         return;
 170 }
 171
 172 static int em28xx_init_audio_isoc(struct em28xx *dev)
 173 {
 174         int       i, errCode;
 175
 176         dprintk("Starting isoc transfers\n");
 177
 178         /* Start streaming */
 179         for (i = 0; i < dev->adev.num_urb; i++) {
 180                 memset(dev->adev.transfer_buffer[i], 0x80,
 181                        dev->adev.urb[i]->transfer_buffer_length);
 182
 183                 errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC);
 184                 if (errCode) {
 185                         em28xx_errdev("submit of audio urb failed (error=%i)\n",
 186                                       errCode);
 187                         em28xx_deinit_isoc_audio(dev);
 188                         atomic_set(&dev->stream_started, 0);
 189                         return errCode;
 190                 }
 191
 192         }
 193
 194         return 0;
 195 }
 196
 197 static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
 198                                         size_t size)
 199 {
 200         struct snd_pcm_runtime *runtime = subs->runtime;
 201
 202         dprintk("Allocating vbuffer\n");
 203         if (runtime->dma_area) {
 204                 if (runtime->dma_bytes > size)
 205                         return 0;
 206
 207                 vfree(runtime->dma_area);
 208         }
 209         runtime->dma_area = vmalloc(size);
 210         if (!runtime->dma_area)
 211                 return -ENOMEM;
 212
 213         runtime->dma_bytes = size;
 214
 215         return 0;
 216 }
 217
 218 static struct snd_pcm_hardware snd_em28xx_hw_capture = {
 219         .info = SNDRV_PCM_INFO_BLOCK_TRANSFER |
 220                 SNDRV_PCM_INFO_MMAP           |
 221                 SNDRV_PCM_INFO_INTERLEAVED    |
 222                 SNDRV_PCM_INFO_BATCH          |
 223                 SNDRV_PCM_INFO_MMAP_VALID,
 224
 225         .formats = SNDRV_PCM_FMTBIT_S16_LE,
 226
 227         .rates = SNDRV_PCM_RATE_48000,
 228
 229         .rate_min = 48000,
 230         .rate_max = 48000,
 231         .channels_min = 2,
 232         .channels_max = 2,
 233         .buffer_bytes_max = 62720 * 8,  /* just about the value in usbaudio.c */
 234
 235
 236         /*
 237          * The period is 12.288 bytes. Allow a 10% of variation along its
 238          * value, in order to avoid overruns/underruns due to some clock
 239          * drift.
 240          *
 241          * FIXME: This period assumes 64 packets, and a 48000 PCM rate.
 242          * Calculate it dynamically.
 243          */
 244         .period_bytes_min = 11059,
 245         .period_bytes_max = 13516,
 246
 247         .periods_min = 2,
 248         .periods_max = 98,              /* 12544, */
 249 };
 250
 251 static int snd_em28xx_capture_open(struct snd_pcm_substream *substream)
 252 {
 253         struct em28xx *dev = snd_pcm_substream_chip(substream);
 254         struct snd_pcm_runtime *runtime = substream->runtime;
 255         int ret = 0;
 256
 257         if (!dev) {
 258                 em28xx_err("BUG: em28xx can't find device struct."
 259                                 " Can't proceed with open\n");
 260                 return -ENODEV;
 261         }
 262
 263         if (dev->disconnected)
 264                 return -ENODEV;
 265
 266         dprintk("opening device and trying to acquire exclusive lock\n");
 267
 268         runtime->hw = snd_em28xx_hw_capture;
 269         if ((dev->alt == 0 || dev->is_audio_only) && dev->adev.users == 0) {
 270                 int nonblock = !!(substream->f_flags & O_NONBLOCK);
 271
 272                 if (nonblock) {
 273                         if (!mutex_trylock(&dev->lock))
 274                                 return -EAGAIN;
 275                 } else
 276                         mutex_lock(&dev->lock);
 277                 if (dev->is_audio_only)
 278                         /* vendor audio is on a separate interface */
 279                         dev->alt = 1;
 280                 else
 281                         /* vendor audio is on the same interface as video */
 282                         dev->alt = 7;
 283                         /*
 284                          * FIXME: The intention seems to be to select the alt
 285                          * setting with the largest wMaxPacketSize for the video
 286                          * endpoint.
 287                          * At least dev->alt should be used instead, but we
 288                          * should probably not touch it at all if it is
 289                          * already >0, because wMaxPacketSize of the audio
 290                          * endpoints seems to be the same for all.
 291                          */
 292
 293                 dprintk("changing alternate number on interface %d to %d\n",
 294                         dev->ifnum, dev->alt);
 295                 usb_set_interface(dev->udev, dev->ifnum, dev->alt);
 296
 297                 /* Sets volume, mute, etc */
 298                 dev->mute = 0;
 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         /* Dynamically adjust the period size */
 308         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
 309         snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
 310                                      dev->adev.period * 95 / 100,
 311                                      dev->adev.period * 105 / 100);
 312
 313         dev->adev.capture_pcm_substream = substream;
 314
 315         return 0;
 316 err:
 317         mutex_unlock(&dev->lock);
 318
 319         em28xx_err("Error while configuring em28xx mixer\n");
 320         return ret;
 321 }
 322
 323 static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream)
 324 {
 325         struct em28xx *dev = snd_pcm_substream_chip(substream);
 326
 327         dprintk("closing device\n");
 328
 329         dev->mute = 1;
 330         mutex_lock(&dev->lock);
 331         dev->adev.users--;
 332         if (atomic_read(&dev->stream_started) > 0) {
 333                 atomic_set(&dev->stream_started, 0);
 334                 schedule_work(&dev->wq_trigger);
 335         }
 336
 337         em28xx_audio_analog_set(dev);
 338         if (substream->runtime->dma_area) {
 339                 dprintk("freeing\n");
 340                 vfree(substream->runtime->dma_area);
 341                 substream->runtime->dma_area = NULL;
 342         }
 343         mutex_unlock(&dev->lock);
 344
 345         return 0;
 346 }
 347
 348 static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream,
 349                                         struct snd_pcm_hw_params *hw_params)
 350 {
 351         int ret;
 352         struct em28xx *dev = snd_pcm_substream_chip(substream);
 353
 354         if (dev->disconnected)
 355                 return -ENODEV;
 356
 357         dprintk("Setting capture parameters\n");
 358
 359         ret = snd_pcm_alloc_vmalloc_buffer(substream,
 360                                 params_buffer_bytes(hw_params));
 361         if (ret < 0)
 362                 return ret;
 363 #if 0
 364         /* TODO: set up em28xx audio chip to deliver the correct audio format,
 365            current default is 48000hz multiplexed => 96000hz mono
 366            which shouldn't matter since analogue TV only supports mono */
 367         unsigned int channels, rate, format;
 368
 369         format = params_format(hw_params);
 370         rate = params_rate(hw_params);
 371         channels = params_channels(hw_params);
 372 #endif
 373
 374         return 0;
 375 }
 376
 377 static int snd_em28xx_hw_capture_free(struct snd_pcm_substream *substream)
 378 {
 379         struct em28xx *dev = snd_pcm_substream_chip(substream);
 380
 381         dprintk("Stop capture, if needed\n");
 382
 383         if (atomic_read(&dev->stream_started) > 0) {
 384                 atomic_set(&dev->stream_started, 0);
 385                 schedule_work(&dev->wq_trigger);
 386         }
 387
 388         return 0;
 389 }
 390
 391 static int snd_em28xx_prepare(struct snd_pcm_substream *substream)
 392 {
 393         struct em28xx *dev = snd_pcm_substream_chip(substream);
 394
 395         if (dev->disconnected)
 396                 return -ENODEV;
 397
 398         dev->adev.hwptr_done_capture = 0;
 399         dev->adev.capture_transfer_done = 0;
 400
 401         return 0;
 402 }
 403
 404 static void audio_trigger(struct work_struct *work)
 405 {
 406         struct em28xx *dev = container_of(work, struct em28xx, wq_trigger);
 407
 408         if (atomic_read(&dev->stream_started)) {
 409                 dprintk("starting capture");
 410                 em28xx_init_audio_isoc(dev);
 411         } else {
 412                 dprintk("stopping capture");
 413                 em28xx_deinit_isoc_audio(dev);
 414         }
 415 }
 416
 417 static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream,
 418                                       int cmd)
 419 {
 420         struct em28xx *dev = snd_pcm_substream_chip(substream);
 421         int retval = 0;
 422
 423         if (dev->disconnected)
 424                 return -ENODEV;
 425
 426         switch (cmd) {
 427         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */
 428         case SNDRV_PCM_TRIGGER_RESUME: /* fall through */
 429         case SNDRV_PCM_TRIGGER_START:
 430                 atomic_set(&dev->stream_started, 1);
 431                 break;
 432         case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */
 433         case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */
 434         case SNDRV_PCM_TRIGGER_STOP:
 435                 atomic_set(&dev->stream_started, 0);
 436                 break;
 437         default:
 438                 retval = -EINVAL;
 439         }
 440         schedule_work(&dev->wq_trigger);
 441         return retval;
 442 }
 443
 444 static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream
 445                                                     *substream)
 446 {
 447         unsigned long flags;
 448         struct em28xx *dev;
 449         snd_pcm_uframes_t hwptr_done;
 450
 451         dev = snd_pcm_substream_chip(substream);
 452         if (dev->disconnected)
 453                 return SNDRV_PCM_POS_XRUN;
 454
 455         spin_lock_irqsave(&dev->adev.slock, flags);
 456         hwptr_done = dev->adev.hwptr_done_capture;
 457         spin_unlock_irqrestore(&dev->adev.slock, flags);
 458
 459         return hwptr_done;
 460 }
 461
 462 static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
 463                                              unsigned long offset)
 464 {
 465         void *pageptr = subs->runtime->dma_area + offset;
 466
 467         return vmalloc_to_page(pageptr);
 468 }
 469
 470 /*
 471  * AC97 volume control support
 472  */
 473 static int em28xx_vol_info(struct snd_kcontrol *kcontrol,
 474                                 struct snd_ctl_elem_info *info)
 475 {
 476         struct em28xx *dev = snd_kcontrol_chip(kcontrol);
 477
 478         if (dev->disconnected)
 479                 return -ENODEV;
 480
 481         info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 482         info->count = 2;
 483         info->value.integer.min = 0;
 484         info->value.integer.max = 0x1f;
 485
 486         return 0;
 487 }
 488
 489 static int em28xx_vol_put(struct snd_kcontrol *kcontrol,
 490                                struct snd_ctl_elem_value *value)
 491 {
 492         struct em28xx *dev = snd_kcontrol_chip(kcontrol);
 493         struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
 494         u16 val = (0x1f - (value->value.integer.value[0] & 0x1f)) |
 495                   (0x1f - (value->value.integer.value[1] & 0x1f)) << 8;
 496         int nonblock = 0;
 497         int rc;
 498
 499         if (dev->disconnected)
 500                 return -ENODEV;
 501
 502         if (substream)
 503                 nonblock = !!(substream->f_flags & O_NONBLOCK);
 504         if (nonblock) {
 505                 if (!mutex_trylock(&dev->lock))
 506                         return -EAGAIN;
 507         } else
 508                 mutex_lock(&dev->lock);
 509         rc = em28xx_read_ac97(dev, kcontrol->private_value);
 510         if (rc < 0)
 511                 goto err;
 512
 513         val |= rc & 0x8000;     /* Preserve the mute flag */
 514
 515         rc = em28xx_write_ac97(dev, kcontrol->private_value, val);
 516         if (rc < 0)
 517                 goto err;
 518
 519         dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n",
 520                 (val & 0x8000) ? "muted " : "",
 521                 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
 522                 val, (int)kcontrol->private_value);
 523
 524 err:
 525         mutex_unlock(&dev->lock);
 526         return rc;
 527 }
 528
 529 static int em28xx_vol_get(struct snd_kcontrol *kcontrol,
 530                                struct snd_ctl_elem_value *value)
 531 {
 532         struct em28xx *dev = snd_kcontrol_chip(kcontrol);
 533         struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
 534         int nonblock = 0;
 535         int val;
 536
 537         if (dev->disconnected)
 538                 return -ENODEV;
 539
 540         if (substream)
 541                 nonblock = !!(substream->f_flags & O_NONBLOCK);
 542         if (nonblock) {
 543                 if (!mutex_trylock(&dev->lock))
 544                         return -EAGAIN;
 545         } else
 546                 mutex_lock(&dev->lock);
 547         val = em28xx_read_ac97(dev, kcontrol->private_value);
 548         mutex_unlock(&dev->lock);
 549         if (val < 0)
 550                 return val;
 551
 552         dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n",
 553                 (val & 0x8000) ? "muted " : "",
 554                 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
 555                 val, (int)kcontrol->private_value);
 556
 557         value->value.integer.value[0] = 0x1f - (val & 0x1f);
 558         value->value.integer.value[1] = 0x1f - ((val << 8) & 0x1f);
 559
 560         return 0;
 561 }
 562
 563 static int em28xx_vol_put_mute(struct snd_kcontrol *kcontrol,
 564                                struct snd_ctl_elem_value *value)
 565 {
 566         struct em28xx *dev = snd_kcontrol_chip(kcontrol);
 567         u16 val = value->value.integer.value[0];
 568         struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
 569         int nonblock = 0;
 570         int rc;
 571
 572         if (dev->disconnected)
 573                 return -ENODEV;
 574
 575         if (substream)
 576                 nonblock = !!(substream->f_flags & O_NONBLOCK);
 577         if (nonblock) {
 578                 if (!mutex_trylock(&dev->lock))
 579                         return -EAGAIN;
 580         } else
 581                 mutex_lock(&dev->lock);
 582         rc = em28xx_read_ac97(dev, kcontrol->private_value);
 583         if (rc < 0)
 584                 goto err;
 585
 586         if (val)
 587                 rc &= 0x1f1f;
 588         else
 589                 rc |= 0x8000;
 590
 591         rc = em28xx_write_ac97(dev, kcontrol->private_value, rc);
 592         if (rc < 0)
 593                 goto err;
 594
 595         dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n",
 596                 (val & 0x8000) ? "muted " : "",
 597                 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
 598                 val, (int)kcontrol->private_value);
 599
 600 err:
 601         mutex_unlock(&dev->lock);
 602         return rc;
 603 }
 604
 605 static int em28xx_vol_get_mute(struct snd_kcontrol *kcontrol,
 606                                struct snd_ctl_elem_value *value)
 607 {
 608         struct em28xx *dev = snd_kcontrol_chip(kcontrol);
 609         struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
 610         int nonblock = 0;
 611         int val;
 612
 613         if (dev->disconnected)
 614                 return -ENODEV;
 615
 616         if (substream)
 617                 nonblock = !!(substream->f_flags & O_NONBLOCK);
 618         if (nonblock) {
 619                 if (!mutex_trylock(&dev->lock))
 620                         return -EAGAIN;
 621         } else
 622                 mutex_lock(&dev->lock);
 623         val = em28xx_read_ac97(dev, kcontrol->private_value);
 624         mutex_unlock(&dev->lock);
 625         if (val < 0)
 626                 return val;
 627
 628         if (val & 0x8000)
 629                 value->value.integer.value[0] = 0;
 630         else
 631                 value->value.integer.value[0] = 1;
 632
 633         dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n",
 634                 (val & 0x8000) ? "muted " : "",
 635                 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
 636                 val, (int)kcontrol->private_value);
 637
 638         return 0;
 639 }
 640
 641 static const DECLARE_TLV_DB_SCALE(em28xx_db_scale, -3450, 150, 0);
 642
 643 static int em28xx_cvol_new(struct snd_card *card, struct em28xx *dev,
 644                            char *name, int id)
 645 {
 646         int err;
 647         char ctl_name[44];
 648         struct snd_kcontrol *kctl;
 649         struct snd_kcontrol_new tmp;
 650
 651         memset (&tmp, 0, sizeof(tmp));
 652         tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 653         tmp.private_value = id,
 654         tmp.name  = ctl_name,
 655
 656         /* Add Mute Control */
 657         sprintf(ctl_name, "%s Switch", name);
 658         tmp.get  = em28xx_vol_get_mute;
 659         tmp.put  = em28xx_vol_put_mute;
 660         tmp.info = snd_ctl_boolean_mono_info;
 661         kctl = snd_ctl_new1(&tmp, dev);
 662         err = snd_ctl_add(card, kctl);
 663         if (err < 0)
 664                 return err;
 665         dprintk("Added control %s for ac97 volume control 0x%04x\n",
 666                 ctl_name, id);
 667
 668         memset (&tmp, 0, sizeof(tmp));
 669         tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 670         tmp.private_value = id,
 671         tmp.name  = ctl_name,
 672
 673         /* Add Volume Control */
 674         sprintf(ctl_name, "%s Volume", name);
 675         tmp.get   = em28xx_vol_get;
 676         tmp.put   = em28xx_vol_put;
 677         tmp.info  = em28xx_vol_info;
 678         tmp.tlv.p = em28xx_db_scale,
 679         kctl = snd_ctl_new1(&tmp, dev);
 680         err = snd_ctl_add(card, kctl);
 681         if (err < 0)
 682                 return err;
 683         dprintk("Added control %s for ac97 volume control 0x%04x\n",
 684                 ctl_name, id);
 685
 686         return 0;
 687 }
 688
 689 /*
 690  * register/unregister code and data
 691  */
 692 static struct snd_pcm_ops snd_em28xx_pcm_capture = {
 693         .open      = snd_em28xx_capture_open,
 694         .close     = snd_em28xx_pcm_close,
 695         .ioctl     = snd_pcm_lib_ioctl,
 696         .hw_params = snd_em28xx_hw_capture_params,
 697         .hw_free   = snd_em28xx_hw_capture_free,
 698         .prepare   = snd_em28xx_prepare,
 699         .trigger   = snd_em28xx_capture_trigger,
 700         .pointer   = snd_em28xx_capture_pointer,
 701         .page      = snd_pcm_get_vmalloc_page,
 702 };
 703
 704 static void em28xx_audio_free_urb(struct em28xx *dev)
 705 {
 706         int i;
 707
 708         for (i = 0; i < dev->adev.num_urb; i++) {
 709                 struct urb *urb = dev->adev.urb[i];
 710
 711                 if (!urb)
 712                         continue;
 713
 714                 usb_free_coherent(dev->udev, urb->transfer_buffer_length,
 715                                   dev->adev.transfer_buffer[i],
 716                                   urb->transfer_dma);
 717
 718                 usb_free_urb(urb);
 719         }
 720         kfree(dev->adev.urb);
 721         kfree(dev->adev.transfer_buffer);
 722         dev->adev.num_urb = 0;
 723 }
 724
 725 /* high bandwidth multiplier, as encoded in highspeed endpoint descriptors */
 726 static int em28xx_audio_ep_packet_size(struct usb_device *udev,
 727                                         struct usb_endpoint_descriptor *e)
 728 {
 729         int size = le16_to_cpu(e->wMaxPacketSize);
 730
 731         if (udev->speed == USB_SPEED_HIGH)
 732                 return (size & 0x7ff) *  (1 + (((size) >> 11) & 0x03));
 733
 734         return size & 0x7ff;
 735 }
 736
 737 static int em28xx_audio_urb_init(struct em28xx *dev)
 738 {
 739         struct usb_interface *intf;
 740         struct usb_endpoint_descriptor *e, *ep = NULL;
 741         int                 i, ep_size, interval, num_urb, npackets;
 742         int                 urb_size, bytes_per_transfer;
 743         u8 alt;
 744
 745         if (dev->ifnum)
 746                 alt = 1;
 747         else
 748                 alt = 7;
 749
 750         intf = usb_ifnum_to_if(dev->udev, dev->ifnum);
 751
 752         if (intf->num_altsetting <= alt) {
 753                 em28xx_errdev("alt %d doesn't exist on interface %d\n",
 754                               dev->ifnum, alt);
 755                 return -ENODEV;
 756         }
 757
 758         for (i = 0; i < intf->altsetting[alt].desc.bNumEndpoints; i++) {
 759                 e = &intf->altsetting[alt].endpoint[i].desc;
 760                 if (!usb_endpoint_dir_in(e))
 761                         continue;
 762                 if (e->bEndpointAddress == EM28XX_EP_AUDIO) {
 763                         ep = e;
 764                         break;
 765                 }
 766         }
 767
 768         if (!ep) {
 769                 em28xx_errdev("Couldn't find an audio endpoint");
 770                 return -ENODEV;
 771         }
 772
 773         ep_size = em28xx_audio_ep_packet_size(dev->udev, ep);
 774         interval = 1 << (ep->bInterval - 1);
 775
 776         em28xx_info("Endpoint 0x%02x %s on intf %d alt %d interval = %d, size %d\n",
 777                      EM28XX_EP_AUDIO, usb_speed_string(dev->udev->speed),
 778                      dev->ifnum, alt,
 779                      interval,
 780                      ep_size);
 781
 782         /* Calculate the number and size of URBs to better fit the audio samples */
 783
 784         /*
 785          * Estimate the number of bytes per DMA transfer.
 786          *
 787          * This is given by the bit rate (for now, only 48000 Hz) multiplied
 788          * by 2 channels and 2 bytes/sample divided by the number of microframe
 789          * intervals and by the microframe rate (125 us)
 790          */
 791         bytes_per_transfer = DIV_ROUND_UP(48000 * 2 * 2, 125 * interval);
 792
 793         /*
 794          * Estimate the number of transfer URBs. Don't let it go past the
 795          * maximum number of URBs that is known to be supported by the device.
 796          */
 797         num_urb = DIV_ROUND_UP(bytes_per_transfer, ep_size);
 798         if (num_urb > EM28XX_MAX_AUDIO_BUFS)
 799                 num_urb = EM28XX_MAX_AUDIO_BUFS;
 800
 801         /*
 802          * Now that we know the number of bytes per transfer and the number of
 803          * URBs, estimate the typical size of an URB, in order to adjust the
 804          * minimal number of packets.
 805          */
 806         urb_size = bytes_per_transfer / num_urb;
 807
 808         /*
 809          * Now, calculate the amount of audio packets to be filled on each
 810          * URB. In order to preserve the old behaviour, use a minimal
 811          * threshold for this value.
 812          */
 813         npackets = EM28XX_MIN_AUDIO_PACKETS;
 814         if (urb_size > ep_size * npackets)
 815                 npackets = DIV_ROUND_UP(urb_size, ep_size);
 816
 817         em28xx_info("Number of URBs: %d, with %d packets and %d size",
 818                     num_urb, npackets, urb_size);
 819
 820         /* Estimate the bytes per period */
 821         dev->adev.period = urb_size * npackets;
 822
 823         /* Allocate space to store the number of URBs to be used */
 824
 825         dev->adev.transfer_buffer = kcalloc(num_urb,
 826                                             sizeof(*dev->adev.transfer_buffer),
 827                                             GFP_ATOMIC);
 828         if (!dev->adev.transfer_buffer) {
 829                 return -ENOMEM;
 830         }
 831
 832         dev->adev.urb = kcalloc(num_urb, sizeof(*dev->adev.urb), GFP_ATOMIC);
 833         if (!dev->adev.urb) {
 834                 kfree(dev->adev.transfer_buffer);
 835                 return -ENOMEM;
 836         }
 837
 838         /* Alloc memory for each URB and for each transfer buffer */
 839         dev->adev.num_urb = num_urb;
 840         for (i = 0; i < num_urb; i++) {
 841                 struct urb *urb;
 842                 int j, k;
 843                 void *buf;
 844
 845                 urb = usb_alloc_urb(npackets, GFP_ATOMIC);
 846                 if (!urb) {
 847                         em28xx_errdev("usb_alloc_urb failed!\n");
 848                         em28xx_audio_free_urb(dev);
 849                         return -ENOMEM;
 850                 }
 851                 dev->adev.urb[i] = urb;
 852
 853                 buf = usb_alloc_coherent(dev->udev, npackets * ep_size, GFP_ATOMIC,
 854                                          &urb->transfer_dma);
 855                 if (!buf) {
 856                         em28xx_errdev("usb_alloc_coherent failed!\n");
 857                         em28xx_audio_free_urb(dev);
 858                         return -ENOMEM;
 859                 }
 860                 dev->adev.transfer_buffer[i] = buf;
 861
 862                 urb->dev = dev->udev;
 863                 urb->context = dev;
 864                 urb->pipe = usb_rcvisocpipe(dev->udev, EM28XX_EP_AUDIO);
 865                 urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
 866                 urb->transfer_buffer = buf;
 867                 urb->interval = interval;
 868                 urb->complete = em28xx_audio_isocirq;
 869                 urb->number_of_packets = npackets;
 870                 urb->transfer_buffer_length = ep_size * npackets;
 871
 872                 for (j = k = 0; j < npackets; j++, k += ep_size) {
 873                         urb->iso_frame_desc[j].offset = k;
 874                         urb->iso_frame_desc[j].length = ep_size;
 875                 }
 876         }
 877
 878         return 0;
 879 }
 880
 881 static int em28xx_audio_init(struct em28xx *dev)
 882 {
 883         struct em28xx_audio *adev = &dev->adev;
 884         struct snd_pcm      *pcm;
 885         struct snd_card     *card;
 886         static int          devnr;
 887         int                 err;
 888
 889         if (!dev->has_alsa_audio) {
 890                 /* This device does not support the extension (in this case
 891                    the device is expecting the snd-usb-audio module or
 892                    doesn't have analog audio support at all) */
 893                 return 0;
 894         }
 895
 896         em28xx_info("Binding audio extension\n");
 897
 898         printk(KERN_INFO "em28xx-audio.c: Copyright (C) 2006 Markus "
 899                          "Rechberger\n");
 900         printk(KERN_INFO
 901                "em28xx-audio.c: Copyright (C) 2007-2014 Mauro Carvalho Chehab\n");
 902
 903         err = snd_card_create(index[devnr], "Em28xx Audio", THIS_MODULE, 0,
 904                               &card);
 905         if (err < 0)
 906                 return err;
 907
 908         spin_lock_init(&adev->slock);
 909         adev->sndcard = card;
 910         adev->udev = dev->udev;
 911
 912         err = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm);
 913         if (err < 0)
 914                 goto card_free;
 915
 916         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_em28xx_pcm_capture);
 917         pcm->info_flags = 0;
 918         pcm->private_data = dev;
 919         strcpy(pcm->name, "Empia 28xx Capture");
 920
 921         snd_card_set_dev(card, &dev->udev->dev);
 922         strcpy(card->driver, "Em28xx-Audio");
 923         strcpy(card->shortname, "Em28xx Audio");
 924         strcpy(card->longname, "Empia Em28xx Audio");
 925
 926         INIT_WORK(&dev->wq_trigger, audio_trigger);
 927
 928         if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {
 929                 em28xx_cvol_new(card, dev, "Video", AC97_VIDEO);
 930                 em28xx_cvol_new(card, dev, "Line In", AC97_LINE);
 931                 em28xx_cvol_new(card, dev, "Phone", AC97_PHONE);
 932                 em28xx_cvol_new(card, dev, "Microphone", AC97_MIC);
 933                 em28xx_cvol_new(card, dev, "CD", AC97_CD);
 934                 em28xx_cvol_new(card, dev, "AUX", AC97_AUX);
 935                 em28xx_cvol_new(card, dev, "PCM", AC97_PCM);
 936
 937                 em28xx_cvol_new(card, dev, "Master", AC97_MASTER);
 938                 em28xx_cvol_new(card, dev, "Line", AC97_HEADPHONE);
 939                 em28xx_cvol_new(card, dev, "Mono", AC97_MASTER_MONO);
 940                 em28xx_cvol_new(card, dev, "LFE", AC97_CENTER_LFE_MASTER);
 941                 em28xx_cvol_new(card, dev, "Surround", AC97_SURROUND_MASTER);
 942         }
 943
 944         err = em28xx_audio_urb_init(dev);
 945         if (err)
 946                 goto card_free;
 947
 948         err = snd_card_register(card);
 949         if (err < 0)
 950                 goto urb_free;
 951
 952         em28xx_info("Audio extension successfully initialized\n");
 953         return 0;
 954
 955 urb_free:
 956         em28xx_audio_free_urb(dev);
 957
 958 card_free:
 959         snd_card_free(card);
 960         adev->sndcard = NULL;
 961
 962         return err;
 963 }
 964
 965 static int em28xx_audio_fini(struct em28xx *dev)
 966 {
 967         if (dev == NULL)
 968                 return 0;
 969
 970         if (dev->has_alsa_audio != 1) {
 971                 /* This device does not support the extension (in this case
 972                    the device is expecting the snd-usb-audio module or
 973                    doesn't have analog audio support at all) */
 974                 return 0;
 975         }
 976
 977         em28xx_info("Closing audio extension");
 978
 979         if (dev->adev.sndcard) {
 980                 snd_card_disconnect(dev->adev.sndcard);
 981                 flush_work(&dev->wq_trigger);
 982
 983                 em28xx_audio_free_urb(dev);
 984
 985                 snd_card_free(dev->adev.sndcard);
 986                 dev->adev.sndcard = NULL;
 987         }
 988
 989         return 0;
 990 }
 991
 992 static struct em28xx_ops audio_ops = {
 993         .id   = EM28XX_AUDIO,
 994         .name = "Em28xx Audio Extension",
 995         .init = em28xx_audio_init,
 996         .fini = em28xx_audio_fini,
 997 };
 998
 999 static int __init em28xx_alsa_register(void)
1000 {
1001         return em28xx_register_extension(&audio_ops);
1002 }
1003
1004 static void __exit em28xx_alsa_unregister(void)
1005 {
1006         em28xx_unregister_extension(&audio_ops);
1007 }
1008
1009 MODULE_LICENSE("GPL");
1010 MODULE_AUTHOR("Markus Rechberger <mrechberger@gmail.com>");
1011 MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@redhat.com>");
1012 MODULE_DESCRIPTION(DRIVER_DESC " - audio interface");
1013 MODULE_VERSION(EM28XX_VERSION);
1014
1015 module_init(em28xx_alsa_register);
1016 module_exit(em28xx_alsa_unregister);