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 nonblock, 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         nonblock = !!(substream->f_flags & O_NONBLOCK);
 269         if (nonblock) {
 270                 if (!mutex_trylock(&dev->lock))
 271                 return -EAGAIN;
 272         } else
 273                 mutex_lock(&dev->lock);
 274
 275         runtime->hw = snd_em28xx_hw_capture;
 276
 277         if (dev->adev.users == 0) {
 278                 if (dev->alt == 0 || dev->is_audio_only) {
 279                         if (dev->is_audio_only)
 280                                 /* audio is on a separate interface */
 281                                 dev->alt = 1;
 282                         else
 283                                 /* audio is on the same interface as video */
 284                                 dev->alt = 7;
 285                                 /*
 286                                  * FIXME: The intention seems to be to select
 287                                  * the alt setting with the largest
 288                                  * wMaxPacketSize for the video endpoint.
 289                                  * At least dev->alt should be used instead, but
 290                                  * we should probably not touch it at all if it
 291                                  * is already >0, because wMaxPacketSize of the
 292                                  * audio endpoints seems to be the same for all.
 293                                  */
 294                         dprintk("changing alternate number on interface %d to %d\n",
 295                                 dev->ifnum, dev->alt);
 296                         usb_set_interface(dev->udev, dev->ifnum, dev->alt);
 297                 }
 298
 299                 /* Sets volume, mute, etc */
 300                 dev->mute = 0;
 301                 ret = em28xx_audio_analog_set(dev);
 302                 if (ret < 0)
 303                         goto err;
 304         }
 305
 306         kref_get(&dev->ref);
 307         dev->adev.users++;
 308         mutex_unlock(&dev->lock);
 309
 310         /* Dynamically adjust the period size */
 311         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
 312         snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
 313                                      dev->adev.period * 95 / 100,
 314                                      dev->adev.period * 105 / 100);
 315
 316         dev->adev.capture_pcm_substream = substream;
 317
 318         return 0;
 319 err:
 320         mutex_unlock(&dev->lock);
 321
 322         em28xx_err("Error while configuring em28xx mixer\n");
 323         return ret;
 324 }
 325
 326 static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream)
 327 {
 328         struct em28xx *dev = snd_pcm_substream_chip(substream);
 329
 330         dprintk("closing device\n");
 331
 332         dev->mute = 1;
 333         mutex_lock(&dev->lock);
 334         dev->adev.users--;
 335         if (atomic_read(&dev->stream_started) > 0) {
 336                 atomic_set(&dev->stream_started, 0);
 337                 schedule_work(&dev->wq_trigger);
 338         }
 339
 340         em28xx_audio_analog_set(dev);
 341         if (substream->runtime->dma_area) {
 342                 dprintk("freeing\n");
 343                 vfree(substream->runtime->dma_area);
 344                 substream->runtime->dma_area = NULL;
 345         }
 346         mutex_unlock(&dev->lock);
 347         kref_put(&dev->ref, em28xx_free_device);
 348
 349         return 0;
 350 }
 351
 352 static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream,
 353                                         struct snd_pcm_hw_params *hw_params)
 354 {
 355         int ret;
 356         struct em28xx *dev = snd_pcm_substream_chip(substream);
 357
 358         if (dev->disconnected)
 359                 return -ENODEV;
 360
 361         dprintk("Setting capture parameters\n");
 362
 363         ret = snd_pcm_alloc_vmalloc_buffer(substream,
 364                                 params_buffer_bytes(hw_params));
 365         if (ret < 0)
 366                 return ret;
 367 #if 0
 368         /* TODO: set up em28xx audio chip to deliver the correct audio format,
 369            current default is 48000hz multiplexed => 96000hz mono
 370            which shouldn't matter since analogue TV only supports mono */
 371         unsigned int channels, rate, format;
 372
 373         format = params_format(hw_params);
 374         rate = params_rate(hw_params);
 375         channels = params_channels(hw_params);
 376 #endif
 377
 378         return 0;
 379 }
 380
 381 static int snd_em28xx_hw_capture_free(struct snd_pcm_substream *substream)
 382 {
 383         struct em28xx *dev = snd_pcm_substream_chip(substream);
 384
 385         dprintk("Stop capture, if needed\n");
 386
 387         if (atomic_read(&dev->stream_started) > 0) {
 388                 atomic_set(&dev->stream_started, 0);
 389                 schedule_work(&dev->wq_trigger);
 390         }
 391
 392         return 0;
 393 }
 394
 395 static int snd_em28xx_prepare(struct snd_pcm_substream *substream)
 396 {
 397         struct em28xx *dev = snd_pcm_substream_chip(substream);
 398
 399         if (dev->disconnected)
 400                 return -ENODEV;
 401
 402         dev->adev.hwptr_done_capture = 0;
 403         dev->adev.capture_transfer_done = 0;
 404
 405         return 0;
 406 }
 407
 408 static void audio_trigger(struct work_struct *work)
 409 {
 410         struct em28xx *dev = container_of(work, struct em28xx, wq_trigger);
 411
 412         if (atomic_read(&dev->stream_started)) {
 413                 dprintk("starting capture");
 414                 em28xx_init_audio_isoc(dev);
 415         } else {
 416                 dprintk("stopping capture");
 417                 em28xx_deinit_isoc_audio(dev);
 418         }
 419 }
 420
 421 static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream,
 422                                       int cmd)
 423 {
 424         struct em28xx *dev = snd_pcm_substream_chip(substream);
 425         int retval = 0;
 426
 427         if (dev->disconnected)
 428                 return -ENODEV;
 429
 430         switch (cmd) {
 431         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */
 432         case SNDRV_PCM_TRIGGER_RESUME: /* fall through */
 433         case SNDRV_PCM_TRIGGER_START:
 434                 atomic_set(&dev->stream_started, 1);
 435                 break;
 436         case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */
 437         case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */
 438         case SNDRV_PCM_TRIGGER_STOP:
 439                 atomic_set(&dev->stream_started, 0);
 440                 break;
 441         default:
 442                 retval = -EINVAL;
 443         }
 444         schedule_work(&dev->wq_trigger);
 445         return retval;
 446 }
 447
 448 static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream
 449                                                     *substream)
 450 {
 451         unsigned long flags;
 452         struct em28xx *dev;
 453         snd_pcm_uframes_t hwptr_done;
 454
 455         dev = snd_pcm_substream_chip(substream);
 456         if (dev->disconnected)
 457                 return SNDRV_PCM_POS_XRUN;
 458
 459         spin_lock_irqsave(&dev->adev.slock, flags);
 460         hwptr_done = dev->adev.hwptr_done_capture;
 461         spin_unlock_irqrestore(&dev->adev.slock, flags);
 462
 463         return hwptr_done;
 464 }
 465
 466 static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
 467                                              unsigned long offset)
 468 {
 469         void *pageptr = subs->runtime->dma_area + offset;
 470
 471         return vmalloc_to_page(pageptr);
 472 }
 473
 474 /*
 475  * AC97 volume control support
 476  */
 477 static int em28xx_vol_info(struct snd_kcontrol *kcontrol,
 478                                 struct snd_ctl_elem_info *info)
 479 {
 480         struct em28xx *dev = snd_kcontrol_chip(kcontrol);
 481
 482         if (dev->disconnected)
 483                 return -ENODEV;
 484
 485         info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 486         info->count = 2;
 487         info->value.integer.min = 0;
 488         info->value.integer.max = 0x1f;
 489
 490         return 0;
 491 }
 492
 493 static int em28xx_vol_put(struct snd_kcontrol *kcontrol,
 494                                struct snd_ctl_elem_value *value)
 495 {
 496         struct em28xx *dev = snd_kcontrol_chip(kcontrol);
 497         struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
 498         u16 val = (0x1f - (value->value.integer.value[0] & 0x1f)) |
 499                   (0x1f - (value->value.integer.value[1] & 0x1f)) << 8;
 500         int nonblock = 0;
 501         int rc;
 502
 503         if (dev->disconnected)
 504                 return -ENODEV;
 505
 506         if (substream)
 507                 nonblock = !!(substream->f_flags & O_NONBLOCK);
 508         if (nonblock) {
 509                 if (!mutex_trylock(&dev->lock))
 510                         return -EAGAIN;
 511         } else
 512                 mutex_lock(&dev->lock);
 513         rc = em28xx_read_ac97(dev, kcontrol->private_value);
 514         if (rc < 0)
 515                 goto err;
 516
 517         val |= rc & 0x8000;     /* Preserve the mute flag */
 518
 519         rc = em28xx_write_ac97(dev, kcontrol->private_value, val);
 520         if (rc < 0)
 521                 goto err;
 522
 523         dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n",
 524                 (val & 0x8000) ? "muted " : "",
 525                 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
 526                 val, (int)kcontrol->private_value);
 527
 528 err:
 529         mutex_unlock(&dev->lock);
 530         return rc;
 531 }
 532
 533 static int em28xx_vol_get(struct snd_kcontrol *kcontrol,
 534                                struct snd_ctl_elem_value *value)
 535 {
 536         struct em28xx *dev = snd_kcontrol_chip(kcontrol);
 537         struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
 538         int nonblock = 0;
 539         int val;
 540
 541         if (dev->disconnected)
 542                 return -ENODEV;
 543
 544         if (substream)
 545                 nonblock = !!(substream->f_flags & O_NONBLOCK);
 546         if (nonblock) {
 547                 if (!mutex_trylock(&dev->lock))
 548                         return -EAGAIN;
 549         } else
 550                 mutex_lock(&dev->lock);
 551         val = em28xx_read_ac97(dev, kcontrol->private_value);
 552         mutex_unlock(&dev->lock);
 553         if (val < 0)
 554                 return val;
 555
 556         dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n",
 557                 (val & 0x8000) ? "muted " : "",
 558                 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
 559                 val, (int)kcontrol->private_value);
 560
 561         value->value.integer.value[0] = 0x1f - (val & 0x1f);
 562         value->value.integer.value[1] = 0x1f - ((val << 8) & 0x1f);
 563
 564         return 0;
 565 }
 566
 567 static int em28xx_vol_put_mute(struct snd_kcontrol *kcontrol,
 568                                struct snd_ctl_elem_value *value)
 569 {
 570         struct em28xx *dev = snd_kcontrol_chip(kcontrol);
 571         u16 val = value->value.integer.value[0];
 572         struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
 573         int nonblock = 0;
 574         int rc;
 575
 576         if (dev->disconnected)
 577                 return -ENODEV;
 578
 579         if (substream)
 580                 nonblock = !!(substream->f_flags & O_NONBLOCK);
 581         if (nonblock) {
 582                 if (!mutex_trylock(&dev->lock))
 583                         return -EAGAIN;
 584         } else
 585                 mutex_lock(&dev->lock);
 586         rc = em28xx_read_ac97(dev, kcontrol->private_value);
 587         if (rc < 0)
 588                 goto err;
 589
 590         if (val)
 591                 rc &= 0x1f1f;
 592         else
 593                 rc |= 0x8000;
 594
 595         rc = em28xx_write_ac97(dev, kcontrol->private_value, rc);
 596         if (rc < 0)
 597                 goto err;
 598
 599         dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n",
 600                 (val & 0x8000) ? "muted " : "",
 601                 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
 602                 val, (int)kcontrol->private_value);
 603
 604 err:
 605         mutex_unlock(&dev->lock);
 606         return rc;
 607 }
 608
 609 static int em28xx_vol_get_mute(struct snd_kcontrol *kcontrol,
 610                                struct snd_ctl_elem_value *value)
 611 {
 612         struct em28xx *dev = snd_kcontrol_chip(kcontrol);
 613         struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
 614         int nonblock = 0;
 615         int val;
 616
 617         if (dev->disconnected)
 618                 return -ENODEV;
 619
 620         if (substream)
 621                 nonblock = !!(substream->f_flags & O_NONBLOCK);
 622         if (nonblock) {
 623                 if (!mutex_trylock(&dev->lock))
 624                         return -EAGAIN;
 625         } else
 626                 mutex_lock(&dev->lock);
 627         val = em28xx_read_ac97(dev, kcontrol->private_value);
 628         mutex_unlock(&dev->lock);
 629         if (val < 0)
 630                 return val;
 631
 632         if (val & 0x8000)
 633                 value->value.integer.value[0] = 0;
 634         else
 635                 value->value.integer.value[0] = 1;
 636
 637         dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n",
 638                 (val & 0x8000) ? "muted " : "",
 639                 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
 640                 val, (int)kcontrol->private_value);
 641
 642         return 0;
 643 }
 644
 645 static const DECLARE_TLV_DB_SCALE(em28xx_db_scale, -3450, 150, 0);
 646
 647 static int em28xx_cvol_new(struct snd_card *card, struct em28xx *dev,
 648                            char *name, int id)
 649 {
 650         int err;
 651         char ctl_name[44];
 652         struct snd_kcontrol *kctl;
 653         struct snd_kcontrol_new tmp;
 654
 655         memset (&tmp, 0, sizeof(tmp));
 656         tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 657         tmp.private_value = id,
 658         tmp.name  = ctl_name,
 659
 660         /* Add Mute Control */
 661         sprintf(ctl_name, "%s Switch", name);
 662         tmp.get  = em28xx_vol_get_mute;
 663         tmp.put  = em28xx_vol_put_mute;
 664         tmp.info = snd_ctl_boolean_mono_info;
 665         kctl = snd_ctl_new1(&tmp, dev);
 666         err = snd_ctl_add(card, kctl);
 667         if (err < 0)
 668                 return err;
 669         dprintk("Added control %s for ac97 volume control 0x%04x\n",
 670                 ctl_name, id);
 671
 672         memset (&tmp, 0, sizeof(tmp));
 673         tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 674         tmp.private_value = id,
 675         tmp.name  = ctl_name,
 676
 677         /* Add Volume Control */
 678         sprintf(ctl_name, "%s Volume", name);
 679         tmp.get   = em28xx_vol_get;
 680         tmp.put   = em28xx_vol_put;
 681         tmp.info  = em28xx_vol_info;
 682         tmp.tlv.p = em28xx_db_scale,
 683         kctl = snd_ctl_new1(&tmp, dev);
 684         err = snd_ctl_add(card, kctl);
 685         if (err < 0)
 686                 return err;
 687         dprintk("Added control %s for ac97 volume control 0x%04x\n",
 688                 ctl_name, id);
 689
 690         return 0;
 691 }
 692
 693 /*
 694  * register/unregister code and data
 695  */
 696 static struct snd_pcm_ops snd_em28xx_pcm_capture = {
 697         .open      = snd_em28xx_capture_open,
 698         .close     = snd_em28xx_pcm_close,
 699         .ioctl     = snd_pcm_lib_ioctl,
 700         .hw_params = snd_em28xx_hw_capture_params,
 701         .hw_free   = snd_em28xx_hw_capture_free,
 702         .prepare   = snd_em28xx_prepare,
 703         .trigger   = snd_em28xx_capture_trigger,
 704         .pointer   = snd_em28xx_capture_pointer,
 705         .page      = snd_pcm_get_vmalloc_page,
 706 };
 707
 708 static void em28xx_audio_free_urb(struct em28xx *dev)
 709 {
 710         int i;
 711
 712         for (i = 0; i < dev->adev.num_urb; i++) {
 713                 struct urb *urb = dev->adev.urb[i];
 714
 715                 if (!urb)
 716                         continue;
 717
 718                 usb_free_coherent(dev->udev, urb->transfer_buffer_length,
 719                                   dev->adev.transfer_buffer[i],
 720                                   urb->transfer_dma);
 721
 722                 usb_free_urb(urb);
 723         }
 724         kfree(dev->adev.urb);
 725         kfree(dev->adev.transfer_buffer);
 726         dev->adev.num_urb = 0;
 727 }
 728
 729 /* high bandwidth multiplier, as encoded in highspeed endpoint descriptors */
 730 static int em28xx_audio_ep_packet_size(struct usb_device *udev,
 731                                         struct usb_endpoint_descriptor *e)
 732 {
 733         int size = le16_to_cpu(e->wMaxPacketSize);
 734
 735         if (udev->speed == USB_SPEED_HIGH)
 736                 return (size & 0x7ff) *  (1 + (((size) >> 11) & 0x03));
 737
 738         return size & 0x7ff;
 739 }
 740
 741 static int em28xx_audio_urb_init(struct em28xx *dev)
 742 {
 743         struct usb_interface *intf;
 744         struct usb_endpoint_descriptor *e, *ep = NULL;
 745         int                 i, ep_size, interval, num_urb, npackets;
 746         int                 urb_size, bytes_per_transfer;
 747         u8 alt;
 748
 749         if (dev->ifnum)
 750                 alt = 1;
 751         else
 752                 alt = 7;
 753
 754         intf = usb_ifnum_to_if(dev->udev, dev->ifnum);
 755
 756         if (intf->num_altsetting <= alt) {
 757                 em28xx_errdev("alt %d doesn't exist on interface %d\n",
 758                               dev->ifnum, alt);
 759                 return -ENODEV;
 760         }
 761
 762         for (i = 0; i < intf->altsetting[alt].desc.bNumEndpoints; i++) {
 763                 e = &intf->altsetting[alt].endpoint[i].desc;
 764                 if (!usb_endpoint_dir_in(e))
 765                         continue;
 766                 if (e->bEndpointAddress == EM28XX_EP_AUDIO) {
 767                         ep = e;
 768                         break;
 769                 }
 770         }
 771
 772         if (!ep) {
 773                 em28xx_errdev("Couldn't find an audio endpoint");
 774                 return -ENODEV;
 775         }
 776
 777         ep_size = em28xx_audio_ep_packet_size(dev->udev, ep);
 778         interval = 1 << (ep->bInterval - 1);
 779
 780         em28xx_info("Endpoint 0x%02x %s on intf %d alt %d interval = %d, size %d\n",
 781                      EM28XX_EP_AUDIO, usb_speed_string(dev->udev->speed),
 782                      dev->ifnum, alt,
 783                      interval,
 784                      ep_size);
 785
 786         /* Calculate the number and size of URBs to better fit the audio samples */
 787
 788         /*
 789          * Estimate the number of bytes per DMA transfer.
 790          *
 791          * This is given by the bit rate (for now, only 48000 Hz) multiplied
 792          * by 2 channels and 2 bytes/sample divided by the number of microframe
 793          * intervals and by the microframe rate (125 us)
 794          */
 795         bytes_per_transfer = DIV_ROUND_UP(48000 * 2 * 2, 125 * interval);
 796
 797         /*
 798          * Estimate the number of transfer URBs. Don't let it go past the
 799          * maximum number of URBs that is known to be supported by the device.
 800          */
 801         num_urb = DIV_ROUND_UP(bytes_per_transfer, ep_size);
 802         if (num_urb > EM28XX_MAX_AUDIO_BUFS)
 803                 num_urb = EM28XX_MAX_AUDIO_BUFS;
 804
 805         /*
 806          * Now that we know the number of bytes per transfer and the number of
 807          * URBs, estimate the typical size of an URB, in order to adjust the
 808          * minimal number of packets.
 809          */
 810         urb_size = bytes_per_transfer / num_urb;
 811
 812         /*
 813          * Now, calculate the amount of audio packets to be filled on each
 814          * URB. In order to preserve the old behaviour, use a minimal
 815          * threshold for this value.
 816          */
 817         npackets = EM28XX_MIN_AUDIO_PACKETS;
 818         if (urb_size > ep_size * npackets)
 819                 npackets = DIV_ROUND_UP(urb_size, ep_size);
 820
 821         em28xx_info("Number of URBs: %d, with %d packets and %d size",
 822                     num_urb, npackets, urb_size);
 823
 824         /* Estimate the bytes per period */
 825         dev->adev.period = urb_size * npackets;
 826
 827         /* Allocate space to store the number of URBs to be used */
 828
 829         dev->adev.transfer_buffer = kcalloc(num_urb,
 830                                             sizeof(*dev->adev.transfer_buffer),
 831                                             GFP_ATOMIC);
 832         if (!dev->adev.transfer_buffer) {
 833                 return -ENOMEM;
 834         }
 835
 836         dev->adev.urb = kcalloc(num_urb, sizeof(*dev->adev.urb), GFP_ATOMIC);
 837         if (!dev->adev.urb) {
 838                 kfree(dev->adev.transfer_buffer);
 839                 return -ENOMEM;
 840         }
 841
 842         /* Alloc memory for each URB and for each transfer buffer */
 843         dev->adev.num_urb = num_urb;
 844         for (i = 0; i < num_urb; i++) {
 845                 struct urb *urb;
 846                 int j, k;
 847                 void *buf;
 848
 849                 urb = usb_alloc_urb(npackets, GFP_ATOMIC);
 850                 if (!urb) {
 851                         em28xx_errdev("usb_alloc_urb failed!\n");
 852                         em28xx_audio_free_urb(dev);
 853                         return -ENOMEM;
 854                 }
 855                 dev->adev.urb[i] = urb;
 856
 857                 buf = usb_alloc_coherent(dev->udev, npackets * ep_size, GFP_ATOMIC,
 858                                          &urb->transfer_dma);
 859                 if (!buf) {
 860                         em28xx_errdev("usb_alloc_coherent failed!\n");
 861                         em28xx_audio_free_urb(dev);
 862                         return -ENOMEM;
 863                 }
 864                 dev->adev.transfer_buffer[i] = buf;
 865
 866                 urb->dev = dev->udev;
 867                 urb->context = dev;
 868                 urb->pipe = usb_rcvisocpipe(dev->udev, EM28XX_EP_AUDIO);
 869                 urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
 870                 urb->transfer_buffer = buf;
 871                 urb->interval = interval;
 872                 urb->complete = em28xx_audio_isocirq;
 873                 urb->number_of_packets = npackets;
 874                 urb->transfer_buffer_length = ep_size * npackets;
 875
 876                 for (j = k = 0; j < npackets; j++, k += ep_size) {
 877                         urb->iso_frame_desc[j].offset = k;
 878                         urb->iso_frame_desc[j].length = ep_size;
 879                 }
 880         }
 881
 882         return 0;
 883 }
 884
 885 static int em28xx_audio_init(struct em28xx *dev)
 886 {
 887         struct em28xx_audio *adev = &dev->adev;
 888         struct snd_pcm      *pcm;
 889         struct snd_card     *card;
 890         static int          devnr;
 891         int                 err;
 892
 893         if (!dev->has_alsa_audio) {
 894                 /* This device does not support the extension (in this case
 895                    the device is expecting the snd-usb-audio module or
 896                    doesn't have analog audio support at all) */
 897                 return 0;
 898         }
 899
 900         em28xx_info("Binding audio extension\n");
 901
 902         kref_get(&dev->ref);
 903
 904         printk(KERN_INFO "em28xx-audio.c: Copyright (C) 2006 Markus "
 905                          "Rechberger\n");
 906         printk(KERN_INFO
 907                "em28xx-audio.c: Copyright (C) 2007-2014 Mauro Carvalho Chehab\n");
 908
 909         err = snd_card_create(index[devnr], "Em28xx Audio", THIS_MODULE, 0,
 910                               &card);
 911         if (err < 0)
 912                 return err;
 913
 914         spin_lock_init(&adev->slock);
 915         adev->sndcard = card;
 916         adev->udev = dev->udev;
 917
 918         err = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm);
 919         if (err < 0)
 920                 goto card_free;
 921
 922         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_em28xx_pcm_capture);
 923         pcm->info_flags = 0;
 924         pcm->private_data = dev;
 925         strcpy(pcm->name, "Empia 28xx Capture");
 926
 927         snd_card_set_dev(card, &dev->udev->dev);
 928         strcpy(card->driver, "Em28xx-Audio");
 929         strcpy(card->shortname, "Em28xx Audio");
 930         strcpy(card->longname, "Empia Em28xx Audio");
 931
 932         INIT_WORK(&dev->wq_trigger, audio_trigger);
 933
 934         if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {
 935                 em28xx_cvol_new(card, dev, "Video", AC97_VIDEO);
 936                 em28xx_cvol_new(card, dev, "Line In", AC97_LINE);
 937                 em28xx_cvol_new(card, dev, "Phone", AC97_PHONE);
 938                 em28xx_cvol_new(card, dev, "Microphone", AC97_MIC);
 939                 em28xx_cvol_new(card, dev, "CD", AC97_CD);
 940                 em28xx_cvol_new(card, dev, "AUX", AC97_AUX);
 941                 em28xx_cvol_new(card, dev, "PCM", AC97_PCM);
 942
 943                 em28xx_cvol_new(card, dev, "Master", AC97_MASTER);
 944                 em28xx_cvol_new(card, dev, "Line", AC97_HEADPHONE);
 945                 em28xx_cvol_new(card, dev, "Mono", AC97_MASTER_MONO);
 946                 em28xx_cvol_new(card, dev, "LFE", AC97_CENTER_LFE_MASTER);
 947                 em28xx_cvol_new(card, dev, "Surround", AC97_SURROUND_MASTER);
 948         }
 949
 950         err = em28xx_audio_urb_init(dev);
 951         if (err)
 952                 goto card_free;
 953
 954         err = snd_card_register(card);
 955         if (err < 0)
 956                 goto urb_free;
 957
 958         em28xx_info("Audio extension successfully initialized\n");
 959         return 0;
 960
 961 urb_free:
 962         em28xx_audio_free_urb(dev);
 963
 964 card_free:
 965         snd_card_free(card);
 966         adev->sndcard = NULL;
 967
 968         return err;
 969 }
 970
 971 static int em28xx_audio_fini(struct em28xx *dev)
 972 {
 973         if (dev == NULL)
 974                 return 0;
 975
 976         if (!dev->has_alsa_audio) {
 977                 /* This device does not support the extension (in this case
 978                    the device is expecting the snd-usb-audio module or
 979                    doesn't have analog audio support at all) */
 980                 return 0;
 981         }
 982
 983         em28xx_info("Closing audio extension");
 984
 985         if (dev->adev.sndcard) {
 986                 snd_card_disconnect(dev->adev.sndcard);
 987                 flush_work(&dev->wq_trigger);
 988
 989                 em28xx_audio_free_urb(dev);
 990
 991                 snd_card_free(dev->adev.sndcard);
 992                 dev->adev.sndcard = NULL;
 993         }
 994
 995         kref_put(&dev->ref, em28xx_free_device);
 996         return 0;
 997 }
 998
 999 static int em28xx_audio_suspend(struct em28xx *dev)
1000 {
1001         if (dev == NULL)
1002                 return 0;
1003
1004         if (!dev->has_alsa_audio)
1005                 return 0;
1006
1007         em28xx_info("Suspending audio extension");
1008         em28xx_deinit_isoc_audio(dev);
1009         atomic_set(&dev->stream_started, 0);
1010         return 0;
1011 }
1012
1013 static int em28xx_audio_resume(struct em28xx *dev)
1014 {
1015         if (dev == NULL)
1016                 return 0;
1017
1018         if (!dev->has_alsa_audio)
1019                 return 0;
1020
1021         em28xx_info("Resuming audio extension");
1022         /* Nothing to do other than schedule_work() ?? */
1023         schedule_work(&dev->wq_trigger);
1024         return 0;
1025 }
1026
1027 static struct em28xx_ops audio_ops = {
1028         .id   = EM28XX_AUDIO,
1029         .name = "Em28xx Audio Extension",
1030         .init = em28xx_audio_init,
1031         .fini = em28xx_audio_fini,
1032         .suspend = em28xx_audio_suspend,
1033         .resume = em28xx_audio_resume,
1034 };
1035
1036 static int __init em28xx_alsa_register(void)
1037 {
1038         return em28xx_register_extension(&audio_ops);
1039 }
1040
1041 static void __exit em28xx_alsa_unregister(void)
1042 {
1043         em28xx_unregister_extension(&audio_ops);
1044 }
1045
1046 MODULE_LICENSE("GPL");
1047 MODULE_AUTHOR("Markus Rechberger <mrechberger@gmail.com>");
1048 MODULE_AUTHOR("Mauro Carvalho Chehab");
1049 MODULE_DESCRIPTION(DRIVER_DESC " - audio interface");
1050 MODULE_VERSION(EM28XX_VERSION);
1051
1052 module_init(em28xx_alsa_register);
1053 module_exit(em28xx_alsa_unregister);