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) 2007-2016 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 "em28xx.h"
  29
  30 #include <linux/kernel.h>
  31 #include <linux/usb.h>
  32 #include <linux/init.h>
  33 #include <linux/sound.h>
  34 #include <linux/spinlock.h>
  35 #include <linux/soundcard.h>
  36 #include <linux/slab.h>
  37 #include <linux/vmalloc.h>
  38 #include <linux/proc_fs.h>
  39 #include <linux/module.h>
  40 #include <sound/core.h>
  41 #include <sound/pcm.h>
  42 #include <sound/pcm_params.h>
  43 #include <sound/info.h>
  44 #include <sound/initval.h>
  45 #include <sound/control.h>
  46 #include <sound/tlv.h>
  47 #include <sound/ac97_codec.h>
  48 #include <media/v4l2-common.h>
  49
  50 static int debug;
  51 module_param(debug, int, 0644);
  52 MODULE_PARM_DESC(debug, "activates debug info");
  53
  54 #define EM28XX_MAX_AUDIO_BUFS           5
  55 #define EM28XX_MIN_AUDIO_PACKETS        64
  56
  57 #define dprintk(fmt, arg...) do {                                       \
  58         if (debug)                                              \
  59                 dev_printk(KERN_DEBUG, &dev->intf->dev,                 \
  60                            "video: %s: " fmt, __func__, ## arg);        \
  61 } while (0)
  62
  63 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
  64
  65 static int em28xx_deinit_isoc_audio(struct em28xx *dev)
  66 {
  67         int i;
  68
  69         dprintk("Stopping isoc\n");
  70         for (i = 0; i < dev->adev.num_urb; i++) {
  71                 struct urb *urb = dev->adev.urb[i];
  72
  73                 if (!irqs_disabled())
  74                         usb_kill_urb(urb);
  75                 else
  76                         usb_unlink_urb(urb);
  77         }
  78
  79         return 0;
  80 }
  81
  82 static void em28xx_audio_isocirq(struct urb *urb)
  83 {
  84         struct em28xx            *dev = urb->context;
  85         int                      i;
  86         unsigned int             oldptr;
  87         int                      period_elapsed = 0;
  88         int                      status;
  89         unsigned char            *cp;
  90         unsigned int             stride;
  91         struct snd_pcm_substream *substream;
  92         struct snd_pcm_runtime   *runtime;
  93
  94         if (dev->disconnected) {
  95                 dprintk("device disconnected while streaming. URB status=%d.\n",
  96                         urb->status);
  97                 atomic_set(&dev->adev.stream_started, 0);
  98                 return;
  99         }
 100
 101         switch (urb->status) {
 102         case 0:             /* success */
 103         case -ETIMEDOUT:    /* NAK */
 104                 break;
 105         case -ECONNRESET:   /* kill */
 106         case -ENOENT:
 107         case -ESHUTDOWN:
 108                 return;
 109         default:            /* error */
 110                 dprintk("urb completition error %d.\n", urb->status);
 111                 break;
 112         }
 113
 114         if (atomic_read(&dev->adev.stream_started) == 0)
 115                 return;
 116
 117         if (dev->adev.capture_pcm_substream) {
 118                 substream = dev->adev.capture_pcm_substream;
 119                 runtime = substream->runtime;
 120                 stride = runtime->frame_bits >> 3;
 121
 122                 for (i = 0; i < urb->number_of_packets; i++) {
 123                         int length =
 124                             urb->iso_frame_desc[i].actual_length / stride;
 125                         cp = (unsigned char *)urb->transfer_buffer +
 126                             urb->iso_frame_desc[i].offset;
 127
 128                         if (!length)
 129                                 continue;
 130
 131                         oldptr = dev->adev.hwptr_done_capture;
 132                         if (oldptr + length >= runtime->buffer_size) {
 133                                 unsigned int cnt =
 134                                     runtime->buffer_size - oldptr;
 135                                 memcpy(runtime->dma_area + oldptr * stride, cp,
 136                                        cnt * stride);
 137                                 memcpy(runtime->dma_area, cp + cnt * stride,
 138                                        length * stride - cnt * stride);
 139                         } else {
 140                                 memcpy(runtime->dma_area + oldptr * stride, cp,
 141                                        length * stride);
 142                         }
 143
 144                         snd_pcm_stream_lock(substream);
 145
 146                         dev->adev.hwptr_done_capture += length;
 147                         if (dev->adev.hwptr_done_capture >=
 148                             runtime->buffer_size)
 149                                 dev->adev.hwptr_done_capture -=
 150                                     runtime->buffer_size;
 151
 152                         dev->adev.capture_transfer_done += length;
 153                         if (dev->adev.capture_transfer_done >=
 154                             runtime->period_size) {
 155                                 dev->adev.capture_transfer_done -=
 156                                     runtime->period_size;
 157                                 period_elapsed = 1;
 158                         }
 159
 160                         snd_pcm_stream_unlock(substream);
 161                 }
 162                 if (period_elapsed)
 163                         snd_pcm_period_elapsed(substream);
 164         }
 165         urb->status = 0;
 166
 167         status = usb_submit_urb(urb, GFP_ATOMIC);
 168         if (status < 0)
 169                 dev_err(&dev->intf->dev,
 170                         "resubmit of audio urb failed (error=%i)\n",
 171                         status);
 172         return;
 173 }
 174
 175 static int em28xx_init_audio_isoc(struct em28xx *dev)
 176 {
 177         int       i, errCode;
 178
 179         dprintk("Starting isoc transfers\n");
 180
 181         /* Start streaming */
 182         for (i = 0; i < dev->adev.num_urb; i++) {
 183                 memset(dev->adev.transfer_buffer[i], 0x80,
 184                        dev->adev.urb[i]->transfer_buffer_length);
 185
 186                 errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC);
 187                 if (errCode) {
 188                         dev_err(&dev->intf->dev,
 189                                 "submit of audio urb failed (error=%i)\n",
 190                                 errCode);
 191                         em28xx_deinit_isoc_audio(dev);
 192                         atomic_set(&dev->adev.stream_started, 0);
 193                         return errCode;
 194                 }
 195
 196         }
 197
 198         return 0;
 199 }
 200
 201 static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
 202                                         size_t size)
 203 {
 204         struct em28xx *dev = snd_pcm_substream_chip(subs);
 205         struct snd_pcm_runtime *runtime = subs->runtime;
 206
 207         dprintk("Allocating vbuffer\n");
 208         if (runtime->dma_area) {
 209                 if (runtime->dma_bytes > size)
 210                         return 0;
 211
 212                 vfree(runtime->dma_area);
 213         }
 214         runtime->dma_area = vmalloc(size);
 215         if (!runtime->dma_area)
 216                 return -ENOMEM;
 217
 218         runtime->dma_bytes = size;
 219
 220         return 0;
 221 }
 222
 223 static struct snd_pcm_hardware snd_em28xx_hw_capture = {
 224         .info = SNDRV_PCM_INFO_BLOCK_TRANSFER |
 225                 SNDRV_PCM_INFO_MMAP           |
 226                 SNDRV_PCM_INFO_INTERLEAVED    |
 227                 SNDRV_PCM_INFO_BATCH          |
 228                 SNDRV_PCM_INFO_MMAP_VALID,
 229
 230         .formats = SNDRV_PCM_FMTBIT_S16_LE,
 231
 232         .rates = SNDRV_PCM_RATE_48000,
 233
 234         .rate_min = 48000,
 235         .rate_max = 48000,
 236         .channels_min = 2,
 237         .channels_max = 2,
 238         .buffer_bytes_max = 62720 * 8,  /* just about the value in usbaudio.c */
 239
 240         /*
 241          * The period is 12.288 bytes. Allow a 10% of variation along its
 242          * value, in order to avoid overruns/underruns due to some clock
 243          * drift.
 244          *
 245          * FIXME: This period assumes 64 packets, and a 48000 PCM rate.
 246          * Calculate it dynamically.
 247          */
 248         .period_bytes_min = 11059,
 249         .period_bytes_max = 13516,
 250
 251         .periods_min = 2,
 252         .periods_max = 98,              /* 12544, */
 253 };
 254
 255 static int snd_em28xx_capture_open(struct snd_pcm_substream *substream)
 256 {
 257         struct em28xx *dev = snd_pcm_substream_chip(substream);
 258         struct snd_pcm_runtime *runtime = substream->runtime;
 259         int nonblock, ret = 0;
 260
 261         if (!dev) {
 262                 pr_err("em28xx-audio: BUG: em28xx can't find device struct. Can't proceed with open\n");
 263                 return -ENODEV;
 264         }
 265
 266         if (dev->disconnected)
 267                 return -ENODEV;
 268
 269         dprintk("opening device and trying to acquire exclusive lock\n");
 270
 271         nonblock = !!(substream->f_flags & O_NONBLOCK);
 272         if (nonblock) {
 273                 if (!mutex_trylock(&dev->lock))
 274                         return -EAGAIN;
 275         } else
 276                 mutex_lock(&dev->lock);
 277
 278         runtime->hw = snd_em28xx_hw_capture;
 279
 280         if (dev->adev.users == 0) {
 281                 if (dev->alt == 0 || dev->is_audio_only) {
 282                         struct usb_device *udev = interface_to_usbdev(dev->intf);
 283
 284                         if (dev->is_audio_only)
 285                                 /* audio is on a separate interface */
 286                                 dev->alt = 1;
 287                         else
 288                                 /* audio is on the same interface as video */
 289                                 dev->alt = 7;
 290                                 /*
 291                                  * FIXME: The intention seems to be to select
 292                                  * the alt setting with the largest
 293                                  * wMaxPacketSize for the video endpoint.
 294                                  * At least dev->alt should be used instead, but
 295                                  * we should probably not touch it at all if it
 296                                  * is already >0, because wMaxPacketSize of the
 297                                  * audio endpoints seems to be the same for all.
 298                                  */
 299                         dprintk("changing alternate number on interface %d to %d\n",
 300                                 dev->ifnum, dev->alt);
 301                         usb_set_interface(udev, dev->ifnum, dev->alt);
 302                 }
 303
 304                 /* Sets volume, mute, etc */
 305                 dev->mute = 0;
 306                 ret = em28xx_audio_analog_set(dev);
 307                 if (ret < 0)
 308                         goto err;
 309         }
 310
 311         kref_get(&dev->ref);
 312         dev->adev.users++;
 313         mutex_unlock(&dev->lock);
 314
 315         /* Dynamically adjust the period size */
 316         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
 317         snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
 318                                      dev->adev.period * 95 / 100,
 319                                      dev->adev.period * 105 / 100);
 320
 321         dev->adev.capture_pcm_substream = substream;
 322
 323         return 0;
 324 err:
 325         mutex_unlock(&dev->lock);
 326
 327         dev_err(&dev->intf->dev,
 328                 "Error while configuring em28xx mixer\n");
 329         return ret;
 330 }
 331
 332 static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream)
 333 {
 334         struct em28xx *dev = snd_pcm_substream_chip(substream);
 335
 336         dprintk("closing device\n");
 337
 338         dev->mute = 1;
 339         mutex_lock(&dev->lock);
 340         dev->adev.users--;
 341         if (atomic_read(&dev->adev.stream_started) > 0) {
 342                 atomic_set(&dev->adev.stream_started, 0);
 343                 schedule_work(&dev->adev.wq_trigger);
 344         }
 345
 346         em28xx_audio_analog_set(dev);
 347         if (substream->runtime->dma_area) {
 348                 dprintk("freeing\n");
 349                 vfree(substream->runtime->dma_area);
 350                 substream->runtime->dma_area = NULL;
 351         }
 352         mutex_unlock(&dev->lock);
 353         kref_put(&dev->ref, em28xx_free_device);
 354
 355         return 0;
 356 }
 357
 358 static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream,
 359                                         struct snd_pcm_hw_params *hw_params)
 360 {
 361         int ret;
 362         struct em28xx *dev = snd_pcm_substream_chip(substream);
 363
 364         if (dev->disconnected)
 365                 return -ENODEV;
 366
 367         dprintk("Setting capture parameters\n");
 368
 369         ret = snd_pcm_alloc_vmalloc_buffer(substream,
 370                                            params_buffer_bytes(hw_params));
 371         if (ret < 0)
 372                 return ret;
 373 #if 0
 374         /* TODO: set up em28xx audio chip to deliver the correct audio format,
 375            current default is 48000hz multiplexed => 96000hz mono
 376            which shouldn't matter since analogue TV only supports mono */
 377         unsigned int channels, rate, format;
 378
 379         format = params_format(hw_params);
 380         rate = params_rate(hw_params);
 381         channels = params_channels(hw_params);
 382 #endif
 383
 384         return 0;
 385 }
 386
 387 static int snd_em28xx_hw_capture_free(struct snd_pcm_substream *substream)
 388 {
 389         struct em28xx *dev = snd_pcm_substream_chip(substream);
 390         struct em28xx_audio *adev = &dev->adev;
 391
 392         dprintk("Stop capture, if needed\n");
 393
 394         if (atomic_read(&adev->stream_started) > 0) {
 395                 atomic_set(&adev->stream_started, 0);
 396                 schedule_work(&adev->wq_trigger);
 397         }
 398
 399         return 0;
 400 }
 401
 402 static int snd_em28xx_prepare(struct snd_pcm_substream *substream)
 403 {
 404         struct em28xx *dev = snd_pcm_substream_chip(substream);
 405
 406         if (dev->disconnected)
 407                 return -ENODEV;
 408
 409         dev->adev.hwptr_done_capture = 0;
 410         dev->adev.capture_transfer_done = 0;
 411
 412         return 0;
 413 }
 414
 415 static void audio_trigger(struct work_struct *work)
 416 {
 417         struct em28xx_audio *adev =
 418                             container_of(work, struct em28xx_audio, wq_trigger);
 419         struct em28xx *dev = container_of(adev, struct em28xx, adev);
 420
 421         if (atomic_read(&adev->stream_started)) {
 422                 dprintk("starting capture");
 423                 em28xx_init_audio_isoc(dev);
 424         } else {
 425                 dprintk("stopping capture");
 426                 em28xx_deinit_isoc_audio(dev);
 427         }
 428 }
 429
 430 static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream,
 431                                       int cmd)
 432 {
 433         struct em28xx *dev = snd_pcm_substream_chip(substream);
 434         int retval = 0;
 435
 436         if (dev->disconnected)
 437                 return -ENODEV;
 438
 439         switch (cmd) {
 440         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */
 441         case SNDRV_PCM_TRIGGER_RESUME: /* fall through */
 442         case SNDRV_PCM_TRIGGER_START:
 443                 atomic_set(&dev->adev.stream_started, 1);
 444                 break;
 445         case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */
 446         case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */
 447         case SNDRV_PCM_TRIGGER_STOP:
 448                 atomic_set(&dev->adev.stream_started, 0);
 449                 break;
 450         default:
 451                 retval = -EINVAL;
 452         }
 453         schedule_work(&dev->adev.wq_trigger);
 454         return retval;
 455 }
 456
 457 static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream
 458                                                     *substream)
 459 {
 460         unsigned long flags;
 461         struct em28xx *dev;
 462         snd_pcm_uframes_t hwptr_done;
 463
 464         dev = snd_pcm_substream_chip(substream);
 465         if (dev->disconnected)
 466                 return SNDRV_PCM_POS_XRUN;
 467
 468         spin_lock_irqsave(&dev->adev.slock, flags);
 469         hwptr_done = dev->adev.hwptr_done_capture;
 470         spin_unlock_irqrestore(&dev->adev.slock, flags);
 471
 472         return hwptr_done;
 473 }
 474
 475 static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
 476                                              unsigned long offset)
 477 {
 478         void *pageptr = subs->runtime->dma_area + offset;
 479
 480         return vmalloc_to_page(pageptr);
 481 }
 482
 483 /*
 484  * AC97 volume control support
 485  */
 486 static int em28xx_vol_info(struct snd_kcontrol *kcontrol,
 487                            struct snd_ctl_elem_info *info)
 488 {
 489         struct em28xx *dev = snd_kcontrol_chip(kcontrol);
 490
 491         if (dev->disconnected)
 492                 return -ENODEV;
 493
 494         info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 495         info->count = 2;
 496         info->value.integer.min = 0;
 497         info->value.integer.max = 0x1f;
 498
 499         return 0;
 500 }
 501
 502 static int em28xx_vol_put(struct snd_kcontrol *kcontrol,
 503                           struct snd_ctl_elem_value *value)
 504 {
 505         struct em28xx *dev = snd_kcontrol_chip(kcontrol);
 506         struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
 507         u16 val = (0x1f - (value->value.integer.value[0] & 0x1f)) |
 508                   (0x1f - (value->value.integer.value[1] & 0x1f)) << 8;
 509         int nonblock = 0;
 510         int rc;
 511
 512         if (dev->disconnected)
 513                 return -ENODEV;
 514
 515         if (substream)
 516                 nonblock = !!(substream->f_flags & O_NONBLOCK);
 517         if (nonblock) {
 518                 if (!mutex_trylock(&dev->lock))
 519                         return -EAGAIN;
 520         } else
 521                 mutex_lock(&dev->lock);
 522         rc = em28xx_read_ac97(dev, kcontrol->private_value);
 523         if (rc < 0)
 524                 goto err;
 525
 526         val |= rc & 0x8000;     /* Preserve the mute flag */
 527
 528         rc = em28xx_write_ac97(dev, kcontrol->private_value, val);
 529         if (rc < 0)
 530                 goto err;
 531
 532         dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n",
 533                 (val & 0x8000) ? "muted " : "",
 534                 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
 535                 val, (int)kcontrol->private_value);
 536
 537 err:
 538         mutex_unlock(&dev->lock);
 539         return rc;
 540 }
 541
 542 static int em28xx_vol_get(struct snd_kcontrol *kcontrol,
 543                           struct snd_ctl_elem_value *value)
 544 {
 545         struct em28xx *dev = snd_kcontrol_chip(kcontrol);
 546         struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
 547         int nonblock = 0;
 548         int val;
 549
 550         if (dev->disconnected)
 551                 return -ENODEV;
 552
 553         if (substream)
 554                 nonblock = !!(substream->f_flags & O_NONBLOCK);
 555         if (nonblock) {
 556                 if (!mutex_trylock(&dev->lock))
 557                         return -EAGAIN;
 558         } else
 559                 mutex_lock(&dev->lock);
 560         val = em28xx_read_ac97(dev, kcontrol->private_value);
 561         mutex_unlock(&dev->lock);
 562         if (val < 0)
 563                 return val;
 564
 565         dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n",
 566                 (val & 0x8000) ? "muted " : "",
 567                 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
 568                 val, (int)kcontrol->private_value);
 569
 570         value->value.integer.value[0] = 0x1f - (val & 0x1f);
 571         value->value.integer.value[1] = 0x1f - ((val << 8) & 0x1f);
 572
 573         return 0;
 574 }
 575
 576 static int em28xx_vol_put_mute(struct snd_kcontrol *kcontrol,
 577                                struct snd_ctl_elem_value *value)
 578 {
 579         struct em28xx *dev = snd_kcontrol_chip(kcontrol);
 580         u16 val = value->value.integer.value[0];
 581         struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
 582         int nonblock = 0;
 583         int rc;
 584
 585         if (dev->disconnected)
 586                 return -ENODEV;
 587
 588         if (substream)
 589                 nonblock = !!(substream->f_flags & O_NONBLOCK);
 590         if (nonblock) {
 591                 if (!mutex_trylock(&dev->lock))
 592                         return -EAGAIN;
 593         } else
 594                 mutex_lock(&dev->lock);
 595         rc = em28xx_read_ac97(dev, kcontrol->private_value);
 596         if (rc < 0)
 597                 goto err;
 598
 599         if (val)
 600                 rc &= 0x1f1f;
 601         else
 602                 rc |= 0x8000;
 603
 604         rc = em28xx_write_ac97(dev, kcontrol->private_value, rc);
 605         if (rc < 0)
 606                 goto err;
 607
 608         dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n",
 609                 (val & 0x8000) ? "muted " : "",
 610                 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
 611                 val, (int)kcontrol->private_value);
 612
 613 err:
 614         mutex_unlock(&dev->lock);
 615         return rc;
 616 }
 617
 618 static int em28xx_vol_get_mute(struct snd_kcontrol *kcontrol,
 619                                struct snd_ctl_elem_value *value)
 620 {
 621         struct em28xx *dev = snd_kcontrol_chip(kcontrol);
 622         struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
 623         int nonblock = 0;
 624         int val;
 625
 626         if (dev->disconnected)
 627                 return -ENODEV;
 628
 629         if (substream)
 630                 nonblock = !!(substream->f_flags & O_NONBLOCK);
 631         if (nonblock) {
 632                 if (!mutex_trylock(&dev->lock))
 633                         return -EAGAIN;
 634         } else
 635                 mutex_lock(&dev->lock);
 636         val = em28xx_read_ac97(dev, kcontrol->private_value);
 637         mutex_unlock(&dev->lock);
 638         if (val < 0)
 639                 return val;
 640
 641         if (val & 0x8000)
 642                 value->value.integer.value[0] = 0;
 643         else
 644                 value->value.integer.value[0] = 1;
 645
 646         dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n",
 647                 (val & 0x8000) ? "muted " : "",
 648                 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
 649                 val, (int)kcontrol->private_value);
 650
 651         return 0;
 652 }
 653
 654 static const DECLARE_TLV_DB_SCALE(em28xx_db_scale, -3450, 150, 0);
 655
 656 static int em28xx_cvol_new(struct snd_card *card, struct em28xx *dev,
 657                            char *name, int id)
 658 {
 659         int err;
 660         char ctl_name[44];
 661         struct snd_kcontrol *kctl;
 662         struct snd_kcontrol_new tmp;
 663
 664         memset(&tmp, 0, sizeof(tmp));
 665         tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 666         tmp.private_value = id,
 667         tmp.name  = ctl_name,
 668
 669         /* Add Mute Control */
 670         sprintf(ctl_name, "%s Switch", name);
 671         tmp.get  = em28xx_vol_get_mute;
 672         tmp.put  = em28xx_vol_put_mute;
 673         tmp.info = snd_ctl_boolean_mono_info;
 674         kctl = snd_ctl_new1(&tmp, dev);
 675         err = snd_ctl_add(card, kctl);
 676         if (err < 0)
 677                 return err;
 678         dprintk("Added control %s for ac97 volume control 0x%04x\n",
 679                 ctl_name, id);
 680
 681         memset(&tmp, 0, sizeof(tmp));
 682         tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 683         tmp.private_value = id,
 684         tmp.name  = ctl_name,
 685
 686         /* Add Volume Control */
 687         sprintf(ctl_name, "%s Volume", name);
 688         tmp.get   = em28xx_vol_get;
 689         tmp.put   = em28xx_vol_put;
 690         tmp.info  = em28xx_vol_info;
 691         tmp.tlv.p = em28xx_db_scale,
 692         kctl = snd_ctl_new1(&tmp, dev);
 693         err = snd_ctl_add(card, kctl);
 694         if (err < 0)
 695                 return err;
 696         dprintk("Added control %s for ac97 volume control 0x%04x\n",
 697                 ctl_name, id);
 698
 699         return 0;
 700 }
 701
 702 /*
 703  * register/unregister code and data
 704  */
 705 static const struct snd_pcm_ops snd_em28xx_pcm_capture = {
 706         .open      = snd_em28xx_capture_open,
 707         .close     = snd_em28xx_pcm_close,
 708         .ioctl     = snd_pcm_lib_ioctl,
 709         .hw_params = snd_em28xx_hw_capture_params,
 710         .hw_free   = snd_em28xx_hw_capture_free,
 711         .prepare   = snd_em28xx_prepare,
 712         .trigger   = snd_em28xx_capture_trigger,
 713         .pointer   = snd_em28xx_capture_pointer,
 714         .page      = snd_pcm_get_vmalloc_page,
 715 };
 716
 717 static void em28xx_audio_free_urb(struct em28xx *dev)
 718 {
 719         struct usb_device *udev = interface_to_usbdev(dev->intf);
 720         int i;
 721
 722         for (i = 0; i < dev->adev.num_urb; i++) {
 723                 struct urb *urb = dev->adev.urb[i];
 724
 725                 if (!urb)
 726                         continue;
 727
 728                 usb_free_coherent(udev, urb->transfer_buffer_length,
 729                                   dev->adev.transfer_buffer[i],
 730                                   urb->transfer_dma);
 731
 732                 usb_free_urb(urb);
 733         }
 734         kfree(dev->adev.urb);
 735         kfree(dev->adev.transfer_buffer);
 736         dev->adev.num_urb = 0;
 737 }
 738
 739 /* high bandwidth multiplier, as encoded in highspeed endpoint descriptors */
 740 static int em28xx_audio_ep_packet_size(struct usb_device *udev,
 741                                        struct usb_endpoint_descriptor *e)
 742 {
 743         int size = le16_to_cpu(e->wMaxPacketSize);
 744
 745         if (udev->speed == USB_SPEED_HIGH)
 746                 return (size & 0x7ff) *  (1 + (((size) >> 11) & 0x03));
 747
 748         return size & 0x7ff;
 749 }
 750
 751 static int em28xx_audio_urb_init(struct em28xx *dev)
 752 {
 753         struct usb_interface *intf;
 754         struct usb_endpoint_descriptor *e, *ep = NULL;
 755         struct usb_device *udev = interface_to_usbdev(dev->intf);
 756         int                 i, ep_size, interval, num_urb, npackets;
 757         int                 urb_size, bytes_per_transfer;
 758         u8 alt;
 759
 760         if (dev->ifnum)
 761                 alt = 1;
 762         else
 763                 alt = 7;
 764
 765         intf = usb_ifnum_to_if(udev, dev->ifnum);
 766
 767         if (intf->num_altsetting <= alt) {
 768                 dev_err(&dev->intf->dev, "alt %d doesn't exist on interface %d\n",
 769                               dev->ifnum, alt);
 770                 return -ENODEV;
 771         }
 772
 773         for (i = 0; i < intf->altsetting[alt].desc.bNumEndpoints; i++) {
 774                 e = &intf->altsetting[alt].endpoint[i].desc;
 775                 if (!usb_endpoint_dir_in(e))
 776                         continue;
 777                 if (e->bEndpointAddress == EM28XX_EP_AUDIO) {
 778                         ep = e;
 779                         break;
 780                 }
 781         }
 782
 783         if (!ep) {
 784                 dev_err(&dev->intf->dev, "Couldn't find an audio endpoint");
 785                 return -ENODEV;
 786         }
 787
 788         ep_size = em28xx_audio_ep_packet_size(udev, ep);
 789         interval = 1 << (ep->bInterval - 1);
 790
 791         dev_info(&dev->intf->dev,
 792                  "Endpoint 0x%02x %s on intf %d alt %d interval = %d, size %d\n",
 793                  EM28XX_EP_AUDIO, usb_speed_string(udev->speed),
 794                  dev->ifnum, alt, interval, ep_size);
 795
 796         /* Calculate the number and size of URBs to better fit the audio samples */
 797
 798         /*
 799          * Estimate the number of bytes per DMA transfer.
 800          *
 801          * This is given by the bit rate (for now, only 48000 Hz) multiplied
 802          * by 2 channels and 2 bytes/sample divided by the number of microframe
 803          * intervals and by the microframe rate (125 us)
 804          */
 805         bytes_per_transfer = DIV_ROUND_UP(48000 * 2 * 2, 125 * interval);
 806
 807         /*
 808          * Estimate the number of transfer URBs. Don't let it go past the
 809          * maximum number of URBs that is known to be supported by the device.
 810          */
 811         num_urb = DIV_ROUND_UP(bytes_per_transfer, ep_size);
 812         if (num_urb > EM28XX_MAX_AUDIO_BUFS)
 813                 num_urb = EM28XX_MAX_AUDIO_BUFS;
 814
 815         /*
 816          * Now that we know the number of bytes per transfer and the number of
 817          * URBs, estimate the typical size of an URB, in order to adjust the
 818          * minimal number of packets.
 819          */
 820         urb_size = bytes_per_transfer / num_urb;
 821
 822         /*
 823          * Now, calculate the amount of audio packets to be filled on each
 824          * URB. In order to preserve the old behaviour, use a minimal
 825          * threshold for this value.
 826          */
 827         npackets = EM28XX_MIN_AUDIO_PACKETS;
 828         if (urb_size > ep_size * npackets)
 829                 npackets = DIV_ROUND_UP(urb_size, ep_size);
 830
 831         dev_info(&dev->intf->dev,
 832                  "Number of URBs: %d, with %d packets and %d size\n",
 833                  num_urb, npackets, urb_size);
 834
 835         /* Estimate the bytes per period */
 836         dev->adev.period = urb_size * npackets;
 837
 838         /* Allocate space to store the number of URBs to be used */
 839
 840         dev->adev.transfer_buffer = kcalloc(num_urb,
 841                                             sizeof(*dev->adev.transfer_buffer),
 842                                             GFP_ATOMIC);
 843         if (!dev->adev.transfer_buffer) {
 844                 return -ENOMEM;
 845         }
 846
 847         dev->adev.urb = kcalloc(num_urb, sizeof(*dev->adev.urb), GFP_ATOMIC);
 848         if (!dev->adev.urb) {
 849                 kfree(dev->adev.transfer_buffer);
 850                 return -ENOMEM;
 851         }
 852
 853         /* Alloc memory for each URB and for each transfer buffer */
 854         dev->adev.num_urb = num_urb;
 855         for (i = 0; i < num_urb; i++) {
 856                 struct urb *urb;
 857                 int j, k;
 858                 void *buf;
 859
 860                 urb = usb_alloc_urb(npackets, GFP_ATOMIC);
 861                 if (!urb) {
 862                         em28xx_audio_free_urb(dev);
 863                         return -ENOMEM;
 864                 }
 865                 dev->adev.urb[i] = urb;
 866
 867                 buf = usb_alloc_coherent(udev, npackets * ep_size, GFP_ATOMIC,
 868                                          &urb->transfer_dma);
 869                 if (!buf) {
 870                         dev_err(&dev->intf->dev,
 871                                 "usb_alloc_coherent failed!\n");
 872                         em28xx_audio_free_urb(dev);
 873                         return -ENOMEM;
 874                 }
 875                 dev->adev.transfer_buffer[i] = buf;
 876
 877                 urb->dev = udev;
 878                 urb->context = dev;
 879                 urb->pipe = usb_rcvisocpipe(udev, EM28XX_EP_AUDIO);
 880                 urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
 881                 urb->transfer_buffer = buf;
 882                 urb->interval = interval;
 883                 urb->complete = em28xx_audio_isocirq;
 884                 urb->number_of_packets = npackets;
 885                 urb->transfer_buffer_length = ep_size * npackets;
 886
 887                 for (j = k = 0; j < npackets; j++, k += ep_size) {
 888                         urb->iso_frame_desc[j].offset = k;
 889                         urb->iso_frame_desc[j].length = ep_size;
 890                 }
 891         }
 892
 893         return 0;
 894 }
 895
 896 static int em28xx_audio_init(struct em28xx *dev)
 897 {
 898         struct em28xx_audio *adev = &dev->adev;
 899         struct usb_device *udev = interface_to_usbdev(dev->intf);
 900         struct snd_pcm      *pcm;
 901         struct snd_card     *card;
 902         static int          devnr;
 903         int                 err;
 904
 905         if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR) {
 906                 /* This device does not support the extension (in this case
 907                    the device is expecting the snd-usb-audio module or
 908                    doesn't have analog audio support at all) */
 909                 return 0;
 910         }
 911
 912         dev_info(&dev->intf->dev, "Binding audio extension\n");
 913
 914         kref_get(&dev->ref);
 915
 916         dev_info(&dev->intf->dev,
 917                  "em28xx-audio.c: Copyright (C) 2006 Markus Rechberger\n");
 918         dev_info(&dev->intf->dev,
 919                  "em28xx-audio.c: Copyright (C) 2007-2016 Mauro Carvalho Chehab\n");
 920
 921         err = snd_card_new(&dev->intf->dev, index[devnr], "Em28xx Audio",
 922                            THIS_MODULE, 0, &card);
 923         if (err < 0)
 924                 return err;
 925
 926         spin_lock_init(&adev->slock);
 927         adev->sndcard = card;
 928         adev->udev = udev;
 929
 930         err = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm);
 931         if (err < 0)
 932                 goto card_free;
 933
 934         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_em28xx_pcm_capture);
 935         pcm->info_flags = 0;
 936         pcm->private_data = dev;
 937         strcpy(pcm->name, "Empia 28xx Capture");
 938
 939         strcpy(card->driver, "Em28xx-Audio");
 940         strcpy(card->shortname, "Em28xx Audio");
 941         strcpy(card->longname, "Empia Em28xx Audio");
 942
 943         INIT_WORK(&adev->wq_trigger, audio_trigger);
 944
 945         if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {
 946                 em28xx_cvol_new(card, dev, "Video", AC97_VIDEO);
 947                 em28xx_cvol_new(card, dev, "Line In", AC97_LINE);
 948                 em28xx_cvol_new(card, dev, "Phone", AC97_PHONE);
 949                 em28xx_cvol_new(card, dev, "Microphone", AC97_MIC);
 950                 em28xx_cvol_new(card, dev, "CD", AC97_CD);
 951                 em28xx_cvol_new(card, dev, "AUX", AC97_AUX);
 952                 em28xx_cvol_new(card, dev, "PCM", AC97_PCM);
 953
 954                 em28xx_cvol_new(card, dev, "Master", AC97_MASTER);
 955                 em28xx_cvol_new(card, dev, "Line", AC97_HEADPHONE);
 956                 em28xx_cvol_new(card, dev, "Mono", AC97_MASTER_MONO);
 957                 em28xx_cvol_new(card, dev, "LFE", AC97_CENTER_LFE_MASTER);
 958                 em28xx_cvol_new(card, dev, "Surround", AC97_SURROUND_MASTER);
 959         }
 960
 961         err = em28xx_audio_urb_init(dev);
 962         if (err)
 963                 goto card_free;
 964
 965         err = snd_card_register(card);
 966         if (err < 0)
 967                 goto urb_free;
 968
 969         dev_info(&dev->intf->dev, "Audio extension successfully initialized\n");
 970         return 0;
 971
 972 urb_free:
 973         em28xx_audio_free_urb(dev);
 974
 975 card_free:
 976         snd_card_free(card);
 977         adev->sndcard = NULL;
 978
 979         return err;
 980 }
 981
 982 static int em28xx_audio_fini(struct em28xx *dev)
 983 {
 984         if (dev == NULL)
 985                 return 0;
 986
 987         if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR) {
 988                 /* This device does not support the extension (in this case
 989                    the device is expecting the snd-usb-audio module or
 990                    doesn't have analog audio support at all) */
 991                 return 0;
 992         }
 993
 994         dev_info(&dev->intf->dev, "Closing audio extension\n");
 995
 996         if (dev->adev.sndcard) {
 997                 snd_card_disconnect(dev->adev.sndcard);
 998                 flush_work(&dev->adev.wq_trigger);
 999
1000                 em28xx_audio_free_urb(dev);
1001
1002                 snd_card_free(dev->adev.sndcard);
1003                 dev->adev.sndcard = NULL;
1004         }
1005
1006         kref_put(&dev->ref, em28xx_free_device);
1007         return 0;
1008 }
1009
1010 static int em28xx_audio_suspend(struct em28xx *dev)
1011 {
1012         if (dev == NULL)
1013                 return 0;
1014
1015         if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR)
1016                 return 0;
1017
1018         dev_info(&dev->intf->dev, "Suspending audio extension\n");
1019         em28xx_deinit_isoc_audio(dev);
1020         atomic_set(&dev->adev.stream_started, 0);
1021         return 0;
1022 }
1023
1024 static int em28xx_audio_resume(struct em28xx *dev)
1025 {
1026         if (dev == NULL)
1027                 return 0;
1028
1029         if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR)
1030                 return 0;
1031
1032         dev_info(&dev->intf->dev, "Resuming audio extension\n");
1033         /* Nothing to do other than schedule_work() ?? */
1034         schedule_work(&dev->adev.wq_trigger);
1035         return 0;
1036 }
1037
1038 static struct em28xx_ops audio_ops = {
1039         .id   = EM28XX_AUDIO,
1040         .name = "Em28xx Audio Extension",
1041         .init = em28xx_audio_init,
1042         .fini = em28xx_audio_fini,
1043         .suspend = em28xx_audio_suspend,
1044         .resume = em28xx_audio_resume,
1045 };
1046
1047 static int __init em28xx_alsa_register(void)
1048 {
1049         return em28xx_register_extension(&audio_ops);
1050 }
1051
1052 static void __exit em28xx_alsa_unregister(void)
1053 {
1054         em28xx_unregister_extension(&audio_ops);
1055 }
1056
1057 MODULE_LICENSE("GPL");
1058 MODULE_AUTHOR("Markus Rechberger <mrechberger@gmail.com>");
1059 MODULE_AUTHOR("Mauro Carvalho Chehab");
1060 MODULE_DESCRIPTION(DRIVER_DESC " - audio interface");
1061 MODULE_VERSION(EM28XX_VERSION);
1062
1063 module_init(em28xx_alsa_register);
1064 module_exit(em28xx_alsa_unregister);