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         }
 170         return;
 171 }
 172
 173 static int em28xx_init_audio_isoc(struct em28xx *dev)
 174 {
 175         int       i, errCode;
 176
 177         dprintk("Starting isoc transfers\n");
 178
 179         /* Start streaming */
 180         for (i = 0; i < dev->adev.num_urb; i++) {
 181                 memset(dev->adev.transfer_buffer[i], 0x80,
 182                        dev->adev.urb[i]->transfer_buffer_length);
 183
 184                 errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC);
 185                 if (errCode) {
 186                         em28xx_errdev("submit of audio urb failed\n");
 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->audio_ifnum) && 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->audio_ifnum)
 278                         dev->alt = 1;
 279                 else
 280                         dev->alt = 7;
 281
 282                 dprintk("changing alternate number on interface %d to %d\n",
 283                         dev->audio_ifnum, dev->alt);
 284                 usb_set_interface(dev->udev, dev->audio_ifnum, dev->alt);
 285
 286                 /* Sets volume, mute, etc */
 287                 dev->mute = 0;
 288                 ret = em28xx_audio_analog_set(dev);
 289                 if (ret < 0)
 290                         goto err;
 291
 292                 dev->adev.users++;
 293                 mutex_unlock(&dev->lock);
 294         }
 295
 296         /* Dynamically adjust the period size */
 297         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
 298         snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
 299                                      dev->adev.period * 95 / 100,
 300                                      dev->adev.period * 105 / 100);
 301
 302         dev->adev.capture_pcm_substream = substream;
 303
 304         return 0;
 305 err:
 306         mutex_unlock(&dev->lock);
 307
 308         em28xx_err("Error while configuring em28xx mixer\n");
 309         return ret;
 310 }
 311
 312 static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream)
 313 {
 314         struct em28xx *dev = snd_pcm_substream_chip(substream);
 315
 316         dprintk("closing device\n");
 317
 318         dev->mute = 1;
 319         mutex_lock(&dev->lock);
 320         dev->adev.users--;
 321         if (atomic_read(&dev->stream_started) > 0) {
 322                 atomic_set(&dev->stream_started, 0);
 323                 schedule_work(&dev->wq_trigger);
 324         }
 325
 326         em28xx_audio_analog_set(dev);
 327         if (substream->runtime->dma_area) {
 328                 dprintk("freeing\n");
 329                 vfree(substream->runtime->dma_area);
 330                 substream->runtime->dma_area = NULL;
 331         }
 332         mutex_unlock(&dev->lock);
 333
 334         return 0;
 335 }
 336
 337 static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream,
 338                                         struct snd_pcm_hw_params *hw_params)
 339 {
 340         int ret;
 341         struct em28xx *dev = snd_pcm_substream_chip(substream);
 342
 343         if (dev->disconnected)
 344                 return -ENODEV;
 345
 346         dprintk("Setting capture parameters\n");
 347
 348         ret = snd_pcm_alloc_vmalloc_buffer(substream,
 349                                 params_buffer_bytes(hw_params));
 350         if (ret < 0)
 351                 return ret;
 352 #if 0
 353         /* TODO: set up em28xx audio chip to deliver the correct audio format,
 354            current default is 48000hz multiplexed => 96000hz mono
 355            which shouldn't matter since analogue TV only supports mono */
 356         unsigned int channels, rate, format;
 357
 358         format = params_format(hw_params);
 359         rate = params_rate(hw_params);
 360         channels = params_channels(hw_params);
 361 #endif
 362
 363         return 0;
 364 }
 365
 366 static int snd_em28xx_hw_capture_free(struct snd_pcm_substream *substream)
 367 {
 368         struct em28xx *dev = snd_pcm_substream_chip(substream);
 369
 370         dprintk("Stop capture, if needed\n");
 371
 372         if (atomic_read(&dev->stream_started) > 0) {
 373                 atomic_set(&dev->stream_started, 0);
 374                 schedule_work(&dev->wq_trigger);
 375         }
 376
 377         return 0;
 378 }
 379
 380 static int snd_em28xx_prepare(struct snd_pcm_substream *substream)
 381 {
 382         struct em28xx *dev = snd_pcm_substream_chip(substream);
 383
 384         if (dev->disconnected)
 385                 return -ENODEV;
 386
 387         dev->adev.hwptr_done_capture = 0;
 388         dev->adev.capture_transfer_done = 0;
 389
 390         return 0;
 391 }
 392
 393 static void audio_trigger(struct work_struct *work)
 394 {
 395         struct em28xx *dev = container_of(work, struct em28xx, wq_trigger);
 396
 397         if (atomic_read(&dev->stream_started)) {
 398                 dprintk("starting capture");
 399                 em28xx_init_audio_isoc(dev);
 400         } else {
 401                 dprintk("stopping capture");
 402                 em28xx_deinit_isoc_audio(dev);
 403         }
 404 }
 405
 406 static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream,
 407                                       int cmd)
 408 {
 409         struct em28xx *dev = snd_pcm_substream_chip(substream);
 410         int retval = 0;
 411
 412         if (dev->disconnected)
 413                 return -ENODEV;
 414
 415         switch (cmd) {
 416         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */
 417         case SNDRV_PCM_TRIGGER_RESUME: /* fall through */
 418         case SNDRV_PCM_TRIGGER_START:
 419                 atomic_set(&dev->stream_started, 1);
 420                 break;
 421         case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */
 422         case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */
 423         case SNDRV_PCM_TRIGGER_STOP:
 424                 atomic_set(&dev->stream_started, 0);
 425                 break;
 426         default:
 427                 retval = -EINVAL;
 428         }
 429         schedule_work(&dev->wq_trigger);
 430         return retval;
 431 }
 432
 433 static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream
 434                                                     *substream)
 435 {
 436         unsigned long flags;
 437         struct em28xx *dev;
 438         snd_pcm_uframes_t hwptr_done;
 439
 440         dev = snd_pcm_substream_chip(substream);
 441         if (dev->disconnected)
 442                 return SNDRV_PCM_POS_XRUN;
 443
 444         spin_lock_irqsave(&dev->adev.slock, flags);
 445         hwptr_done = dev->adev.hwptr_done_capture;
 446         spin_unlock_irqrestore(&dev->adev.slock, flags);
 447
 448         return hwptr_done;
 449 }
 450
 451 static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
 452                                              unsigned long offset)
 453 {
 454         void *pageptr = subs->runtime->dma_area + offset;
 455
 456         return vmalloc_to_page(pageptr);
 457 }
 458
 459 /*
 460  * AC97 volume control support
 461  */
 462 static int em28xx_vol_info(struct snd_kcontrol *kcontrol,
 463                                 struct snd_ctl_elem_info *info)
 464 {
 465         struct em28xx *dev = snd_kcontrol_chip(kcontrol);
 466
 467         if (dev->disconnected)
 468                 return -ENODEV;
 469
 470         info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 471         info->count = 2;
 472         info->value.integer.min = 0;
 473         info->value.integer.max = 0x1f;
 474
 475         return 0;
 476 }
 477
 478 static int em28xx_vol_put(struct snd_kcontrol *kcontrol,
 479                                struct snd_ctl_elem_value *value)
 480 {
 481         struct em28xx *dev = snd_kcontrol_chip(kcontrol);
 482         struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
 483         u16 val = (0x1f - (value->value.integer.value[0] & 0x1f)) |
 484                   (0x1f - (value->value.integer.value[1] & 0x1f)) << 8;
 485         int nonblock = 0;
 486         int rc;
 487
 488         if (dev->disconnected)
 489                 return -ENODEV;
 490
 491         if (substream)
 492                 nonblock = !!(substream->f_flags & O_NONBLOCK);
 493         if (nonblock) {
 494                 if (!mutex_trylock(&dev->lock))
 495                         return -EAGAIN;
 496         } else
 497                 mutex_lock(&dev->lock);
 498         rc = em28xx_read_ac97(dev, kcontrol->private_value);
 499         if (rc < 0)
 500                 goto err;
 501
 502         val |= rc & 0x8000;     /* Preserve the mute flag */
 503
 504         rc = em28xx_write_ac97(dev, kcontrol->private_value, val);
 505         if (rc < 0)
 506                 goto err;
 507
 508         dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n",
 509                 (val & 0x8000) ? "muted " : "",
 510                 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
 511                 val, (int)kcontrol->private_value);
 512
 513 err:
 514         mutex_unlock(&dev->lock);
 515         return rc;
 516 }
 517
 518 static int em28xx_vol_get(struct snd_kcontrol *kcontrol,
 519                                struct snd_ctl_elem_value *value)
 520 {
 521         struct em28xx *dev = snd_kcontrol_chip(kcontrol);
 522         struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
 523         int nonblock = 0;
 524         int val;
 525
 526         if (dev->disconnected)
 527                 return -ENODEV;
 528
 529         if (substream)
 530                 nonblock = !!(substream->f_flags & O_NONBLOCK);
 531         if (nonblock) {
 532                 if (!mutex_trylock(&dev->lock))
 533                         return -EAGAIN;
 534         } else
 535                 mutex_lock(&dev->lock);
 536         val = em28xx_read_ac97(dev, kcontrol->private_value);
 537         mutex_unlock(&dev->lock);
 538         if (val < 0)
 539                 return val;
 540
 541         dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n",
 542                 (val & 0x8000) ? "muted " : "",
 543                 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
 544                 val, (int)kcontrol->private_value);
 545
 546         value->value.integer.value[0] = 0x1f - (val & 0x1f);
 547         value->value.integer.value[1] = 0x1f - ((val << 8) & 0x1f);
 548
 549         return 0;
 550 }
 551
 552 static int em28xx_vol_put_mute(struct snd_kcontrol *kcontrol,
 553                                struct snd_ctl_elem_value *value)
 554 {
 555         struct em28xx *dev = snd_kcontrol_chip(kcontrol);
 556         u16 val = value->value.integer.value[0];
 557         struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
 558         int nonblock = 0;
 559         int rc;
 560
 561         if (dev->disconnected)
 562                 return -ENODEV;
 563
 564         if (substream)
 565                 nonblock = !!(substream->f_flags & O_NONBLOCK);
 566         if (nonblock) {
 567                 if (!mutex_trylock(&dev->lock))
 568                         return -EAGAIN;
 569         } else
 570                 mutex_lock(&dev->lock);
 571         rc = em28xx_read_ac97(dev, kcontrol->private_value);
 572         if (rc < 0)
 573                 goto err;
 574
 575         if (val)
 576                 rc &= 0x1f1f;
 577         else
 578                 rc |= 0x8000;
 579
 580         rc = em28xx_write_ac97(dev, kcontrol->private_value, rc);
 581         if (rc < 0)
 582                 goto err;
 583
 584         dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n",
 585                 (val & 0x8000) ? "muted " : "",
 586                 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
 587                 val, (int)kcontrol->private_value);
 588
 589 err:
 590         mutex_unlock(&dev->lock);
 591         return rc;
 592 }
 593
 594 static int em28xx_vol_get_mute(struct snd_kcontrol *kcontrol,
 595                                struct snd_ctl_elem_value *value)
 596 {
 597         struct em28xx *dev = snd_kcontrol_chip(kcontrol);
 598         struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
 599         int nonblock = 0;
 600         int val;
 601
 602         if (dev->disconnected)
 603                 return -ENODEV;
 604
 605         if (substream)
 606                 nonblock = !!(substream->f_flags & O_NONBLOCK);
 607         if (nonblock) {
 608                 if (!mutex_trylock(&dev->lock))
 609                         return -EAGAIN;
 610         } else
 611                 mutex_lock(&dev->lock);
 612         val = em28xx_read_ac97(dev, kcontrol->private_value);
 613         mutex_unlock(&dev->lock);
 614         if (val < 0)
 615                 return val;
 616
 617         if (val & 0x8000)
 618                 value->value.integer.value[0] = 0;
 619         else
 620                 value->value.integer.value[0] = 1;
 621
 622         dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n",
 623                 (val & 0x8000) ? "muted " : "",
 624                 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
 625                 val, (int)kcontrol->private_value);
 626
 627         return 0;
 628 }
 629
 630 static const DECLARE_TLV_DB_SCALE(em28xx_db_scale, -3450, 150, 0);
 631
 632 static int em28xx_cvol_new(struct snd_card *card, struct em28xx *dev,
 633                            char *name, int id)
 634 {
 635         int err;
 636         char ctl_name[44];
 637         struct snd_kcontrol *kctl;
 638         struct snd_kcontrol_new tmp;
 639
 640         memset (&tmp, 0, sizeof(tmp));
 641         tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 642         tmp.private_value = id,
 643         tmp.name  = ctl_name,
 644
 645         /* Add Mute Control */
 646         sprintf(ctl_name, "%s Switch", name);
 647         tmp.get  = em28xx_vol_get_mute;
 648         tmp.put  = em28xx_vol_put_mute;
 649         tmp.info = snd_ctl_boolean_mono_info;
 650         kctl = snd_ctl_new1(&tmp, dev);
 651         err = snd_ctl_add(card, kctl);
 652         if (err < 0)
 653                 return err;
 654         dprintk("Added control %s for ac97 volume control 0x%04x\n",
 655                 ctl_name, id);
 656
 657         memset (&tmp, 0, sizeof(tmp));
 658         tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 659         tmp.private_value = id,
 660         tmp.name  = ctl_name,
 661
 662         /* Add Volume Control */
 663         sprintf(ctl_name, "%s Volume", name);
 664         tmp.get   = em28xx_vol_get;
 665         tmp.put   = em28xx_vol_put;
 666         tmp.info  = em28xx_vol_info;
 667         tmp.tlv.p = em28xx_db_scale,
 668         kctl = snd_ctl_new1(&tmp, dev);
 669         err = snd_ctl_add(card, kctl);
 670         if (err < 0)
 671                 return err;
 672         dprintk("Added control %s for ac97 volume control 0x%04x\n",
 673                 ctl_name, id);
 674
 675         return 0;
 676 }
 677
 678 /*
 679  * register/unregister code and data
 680  */
 681 static struct snd_pcm_ops snd_em28xx_pcm_capture = {
 682         .open      = snd_em28xx_capture_open,
 683         .close     = snd_em28xx_pcm_close,
 684         .ioctl     = snd_pcm_lib_ioctl,
 685         .hw_params = snd_em28xx_hw_capture_params,
 686         .hw_free   = snd_em28xx_hw_capture_free,
 687         .prepare   = snd_em28xx_prepare,
 688         .trigger   = snd_em28xx_capture_trigger,
 689         .pointer   = snd_em28xx_capture_pointer,
 690         .page      = snd_pcm_get_vmalloc_page,
 691 };
 692
 693 static void em28xx_audio_free_urb(struct em28xx *dev)
 694 {
 695         int i;
 696
 697         for (i = 0; i < dev->adev.num_urb; i++) {
 698                 struct urb *urb = dev->adev.urb[i];
 699
 700                 if (!urb)
 701                         continue;
 702
 703                 if (dev->adev.transfer_buffer[i])
 704                         usb_free_coherent(dev->udev,
 705                                           urb->transfer_buffer_length,
 706                                           dev->adev.transfer_buffer[i],
 707                                           urb->transfer_dma);
 708
 709                 usb_free_urb(urb);
 710         }
 711         kfree(dev->adev.urb);
 712         kfree(dev->adev.transfer_buffer);
 713         dev->adev.num_urb = 0;
 714 }
 715
 716 /* high bandwidth multiplier, as encoded in highspeed endpoint descriptors */
 717 static int em28xx_audio_ep_packet_size(struct usb_device *udev,
 718                                         struct usb_endpoint_descriptor *e)
 719 {
 720         int size = le16_to_cpu(e->wMaxPacketSize);
 721
 722         if (udev->speed == USB_SPEED_HIGH)
 723                 return (size & 0x7ff) *  (1 + (((size) >> 11) & 0x03));
 724
 725         return size & 0x7ff;
 726 }
 727
 728 static int em28xx_audio_urb_init(struct em28xx *dev)
 729 {
 730         struct usb_interface *intf;
 731         struct usb_endpoint_descriptor *e, *ep = NULL;
 732         int                 i, ep_size, interval, num_urb, npackets;
 733         int                 urb_size, bytes_per_transfer;
 734         u8 alt;
 735
 736         if (dev->audio_ifnum)
 737                 alt = 1;
 738         else
 739                 alt = 7;
 740
 741         intf = usb_ifnum_to_if(dev->udev, dev->audio_ifnum);
 742
 743         if (intf->num_altsetting <= alt) {
 744                 em28xx_errdev("alt %d doesn't exist on interface %d\n",
 745                               dev->audio_ifnum, alt);
 746                 return -ENODEV;
 747         }
 748
 749         for (i = 0; i < intf->altsetting[alt].desc.bNumEndpoints; i++) {
 750                 e = &intf->altsetting[alt].endpoint[i].desc;
 751                 if (!usb_endpoint_dir_in(e))
 752                         continue;
 753                 if (e->bEndpointAddress == EM28XX_EP_AUDIO) {
 754                         ep = e;
 755                         break;
 756                 }
 757         }
 758
 759         if (!ep) {
 760                 em28xx_errdev("Couldn't find an audio endpoint");
 761                 return -ENODEV;
 762         }
 763
 764         ep_size = em28xx_audio_ep_packet_size(dev->udev, ep);
 765         interval = 1 << (ep->bInterval - 1);
 766
 767         em28xx_info("Endpoint 0x%02x %s on intf %d alt %d interval = %d, size %d\n",
 768                      EM28XX_EP_AUDIO, usb_speed_string(dev->udev->speed),
 769                      dev->audio_ifnum, alt,
 770                      interval,
 771                      ep_size);
 772
 773         /* Calculate the number and size of URBs to better fit the audio samples */
 774
 775         /*
 776          * Estimate the number of bytes per DMA transfer.
 777          *
 778          * This is given by the bit rate (for now, only 48000 Hz) multiplied
 779          * by 2 channels and 2 bytes/sample divided by the number of microframe
 780          * intervals and by the microframe rate (125 us)
 781          */
 782         bytes_per_transfer = DIV_ROUND_UP(48000 * 2 * 2, 125 * interval);
 783
 784         /*
 785          * Estimate the number of transfer URBs. Don't let it go past the
 786          * maximum number of URBs that is known to be supported by the device.
 787          */
 788         num_urb = DIV_ROUND_UP(bytes_per_transfer, ep_size);
 789         if (num_urb > EM28XX_MAX_AUDIO_BUFS)
 790                 num_urb = EM28XX_MAX_AUDIO_BUFS;
 791
 792         /*
 793          * Now that we know the number of bytes per transfer and the number of
 794          * URBs, estimate the typical size of an URB, in order to adjust the
 795          * minimal number of packets.
 796          */
 797         urb_size = bytes_per_transfer / num_urb;
 798
 799         /*
 800          * Now, calculate the amount of audio packets to be filled on each
 801          * URB. In order to preserve the old behaviour, use a minimal
 802          * threshold for this value.
 803          */
 804         npackets = EM28XX_MIN_AUDIO_PACKETS;
 805         if (urb_size > ep_size * npackets)
 806                 npackets = DIV_ROUND_UP(urb_size, ep_size);
 807
 808         em28xx_info("Number of URBs: %d, with %d packets and %d size",
 809                     num_urb, npackets, urb_size);
 810
 811         /* Estimate the bytes per period */
 812         dev->adev.period = urb_size * npackets;
 813
 814         /* Allocate space to store the number of URBs to be used */
 815
 816         dev->adev.transfer_buffer = kcalloc(num_urb,
 817                                             sizeof(*dev->adev.transfer_buffer),
 818                                             GFP_ATOMIC);
 819         if (!dev->adev.transfer_buffer) {
 820                 return -ENOMEM;
 821         }
 822
 823         dev->adev.urb = kcalloc(num_urb, sizeof(*dev->adev.urb), GFP_ATOMIC);
 824         if (!dev->adev.urb) {
 825                 kfree(dev->adev.transfer_buffer);
 826                 return -ENOMEM;
 827         }
 828
 829         /* Alloc memory for each URB and for each transfer buffer */
 830         dev->adev.num_urb = num_urb;
 831         for (i = 0; i < num_urb; i++) {
 832                 struct urb *urb;
 833                 int j, k;
 834                 void *buf;
 835
 836                 urb = usb_alloc_urb(npackets, GFP_ATOMIC);
 837                 if (!urb) {
 838                         em28xx_errdev("usb_alloc_urb failed!\n");
 839                         em28xx_audio_free_urb(dev);
 840                         return -ENOMEM;
 841                 }
 842                 dev->adev.urb[i] = urb;
 843
 844                 buf = usb_alloc_coherent(dev->udev, npackets * ep_size, GFP_ATOMIC,
 845                                          &urb->transfer_dma);
 846                 if (!buf) {
 847                         em28xx_errdev("usb_alloc_coherent failed!\n");
 848                         em28xx_audio_free_urb(dev);
 849                         return -ENOMEM;
 850                 }
 851                 dev->adev.transfer_buffer[i] = buf;
 852
 853                 urb->dev = dev->udev;
 854                 urb->context = dev;
 855                 urb->pipe = usb_rcvisocpipe(dev->udev, EM28XX_EP_AUDIO);
 856                 urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
 857                 urb->transfer_buffer = buf;
 858                 urb->interval = interval;
 859                 urb->complete = em28xx_audio_isocirq;
 860                 urb->number_of_packets = npackets;
 861                 urb->transfer_buffer_length = ep_size * npackets;
 862
 863                 for (j = k = 0; j < npackets; j++, k += ep_size) {
 864                         urb->iso_frame_desc[j].offset = k;
 865                         urb->iso_frame_desc[j].length = ep_size;
 866                 }
 867         }
 868
 869         return 0;
 870 }
 871
 872 static int em28xx_audio_init(struct em28xx *dev)
 873 {
 874         struct em28xx_audio *adev = &dev->adev;
 875         struct snd_pcm      *pcm;
 876         struct snd_card     *card;
 877         static int          devnr;
 878         int                 err;
 879
 880         if (!dev->has_alsa_audio || dev->audio_ifnum < 0) {
 881                 /* This device does not support the extension (in this case
 882                    the device is expecting the snd-usb-audio module or
 883                    doesn't have analog audio support at all) */
 884                 return 0;
 885         }
 886
 887         em28xx_info("Binding audio extension\n");
 888
 889         printk(KERN_INFO "em28xx-audio.c: Copyright (C) 2006 Markus "
 890                          "Rechberger\n");
 891         printk(KERN_INFO
 892                "em28xx-audio.c: Copyright (C) 2007-2014 Mauro Carvalho Chehab\n");
 893
 894         err = snd_card_create(index[devnr], "Em28xx Audio", THIS_MODULE, 0,
 895                               &card);
 896         if (err < 0)
 897                 return err;
 898
 899         spin_lock_init(&adev->slock);
 900         adev->sndcard = card;
 901         adev->udev = dev->udev;
 902
 903         err = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm);
 904         if (err < 0)
 905                 goto card_free;
 906
 907         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_em28xx_pcm_capture);
 908         pcm->info_flags = 0;
 909         pcm->private_data = dev;
 910         strcpy(pcm->name, "Empia 28xx Capture");
 911
 912         snd_card_set_dev(card, &dev->udev->dev);
 913         strcpy(card->driver, "Em28xx-Audio");
 914         strcpy(card->shortname, "Em28xx Audio");
 915         strcpy(card->longname, "Empia Em28xx Audio");
 916
 917         INIT_WORK(&dev->wq_trigger, audio_trigger);
 918
 919         if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {
 920                 em28xx_cvol_new(card, dev, "Video", AC97_VIDEO);
 921                 em28xx_cvol_new(card, dev, "Line In", AC97_LINE);
 922                 em28xx_cvol_new(card, dev, "Phone", AC97_PHONE);
 923                 em28xx_cvol_new(card, dev, "Microphone", AC97_MIC);
 924                 em28xx_cvol_new(card, dev, "CD", AC97_CD);
 925                 em28xx_cvol_new(card, dev, "AUX", AC97_AUX);
 926                 em28xx_cvol_new(card, dev, "PCM", AC97_PCM);
 927
 928                 em28xx_cvol_new(card, dev, "Master", AC97_MASTER);
 929                 em28xx_cvol_new(card, dev, "Line", AC97_HEADPHONE);
 930                 em28xx_cvol_new(card, dev, "Mono", AC97_MASTER_MONO);
 931                 em28xx_cvol_new(card, dev, "LFE", AC97_CENTER_LFE_MASTER);
 932                 em28xx_cvol_new(card, dev, "Surround", AC97_SURROUND_MASTER);
 933         }
 934
 935         err = em28xx_audio_urb_init(dev);
 936         if (err)
 937                 goto card_free;
 938
 939         err = snd_card_register(card);
 940         if (err < 0)
 941                 goto urb_free;
 942
 943         em28xx_info("Audio extension successfully initialized\n");
 944         return 0;
 945
 946 urb_free:
 947         em28xx_audio_free_urb(dev);
 948
 949 card_free:
 950         snd_card_free(card);
 951
 952         return err;
 953 }
 954
 955 static int em28xx_audio_fini(struct em28xx *dev)
 956 {
 957         if (dev == NULL)
 958                 return 0;
 959
 960         if (dev->has_alsa_audio != 1) {
 961                 /* This device does not support the extension (in this case
 962                    the device is expecting the snd-usb-audio module or
 963                    doesn't have analog audio support at all) */
 964                 return 0;
 965         }
 966
 967         em28xx_info("Closing audio extension");
 968
 969         snd_card_disconnect(dev->adev.sndcard);
 970         em28xx_audio_free_urb(dev);
 971
 972         if (dev->adev.sndcard) {
 973                 snd_card_free(dev->adev.sndcard);
 974                 dev->adev.sndcard = NULL;
 975         }
 976
 977         return 0;
 978 }
 979
 980 static struct em28xx_ops audio_ops = {
 981         .id   = EM28XX_AUDIO,
 982         .name = "Em28xx Audio Extension",
 983         .init = em28xx_audio_init,
 984         .fini = em28xx_audio_fini,
 985 };
 986
 987 static int __init em28xx_alsa_register(void)
 988 {
 989         return em28xx_register_extension(&audio_ops);
 990 }
 991
 992 static void __exit em28xx_alsa_unregister(void)
 993 {
 994         em28xx_unregister_extension(&audio_ops);
 995 }
 996
 997 MODULE_LICENSE("GPL");
 998 MODULE_AUTHOR("Markus Rechberger <mrechberger@gmail.com>");
 999 MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@redhat.com>");
1000 MODULE_DESCRIPTION(DRIVER_DESC " - audio interface");
1001 MODULE_VERSION(EM28XX_VERSION);
1002
1003 module_init(em28xx_alsa_register);
1004 module_exit(em28xx_alsa_unregister);