drivers/media/usb/em28xx/em28xx-audio.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 //
   3 // Empiatech em28x1 audio extension
   4 //
   5 // Copyright (C) 2006 Markus Rechberger <mrechberger@gmail.com>
   6 //
   7 // Copyright (C) 2007-2016 Mauro Carvalho Chehab
   8 //      - Port to work with the in-kernel driver
   9 //      - Cleanups, fixes, alsa-controls, etc.
  10 //
  11 // This driver is based on my previous au600 usb pstn audio driver
  12 // and inherits all the copyrights
  13 //
  14 // This program is free software; you can redistribute it and/or modify
  15 // it under the terms of the GNU General Public License as published by
  16 // the Free Software Foundation; either version 2 of the License, or
  17 // (at your option) any later version.
  18 //
  19 // This program is distributed in the hope that it will be useful,
  20 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  21 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22 // GNU General Public License for more details.
  23
  24 #include "em28xx.h"
  25
  26 #include <linux/kernel.h>
  27 #include <linux/usb.h>
  28 #include <linux/init.h>
  29 #include <linux/sound.h>
  30 #include <linux/spinlock.h>
  31 #include <linux/soundcard.h>
  32 #include <linux/slab.h>
  33 #include <linux/vmalloc.h>
  34 #include <linux/proc_fs.h>
  35 #include <linux/module.h>
  36 #include <sound/core.h>
  37 #include <sound/pcm.h>
  38 #include <sound/pcm_params.h>
  39 #include <sound/info.h>
  40 #include <sound/initval.h>
  41 #include <sound/control.h>
  42 #include <sound/tlv.h>
  43 #include <sound/ac97_codec.h>
  44 #include <media/v4l2-common.h>
  45
  46 static int debug;
  47 module_param(debug, int, 0644);
  48 MODULE_PARM_DESC(debug, "activates debug info");
  49
  50 #define EM28XX_MAX_AUDIO_BUFS           5
  51 #define EM28XX_MIN_AUDIO_PACKETS        64
  52
  53 #define dprintk(fmt, arg...) do {                                       \
  54         if (debug)                                              \
  55                 dev_printk(KERN_DEBUG, &dev->intf->dev,                 \
  56                            "video: %s: " fmt, __func__, ## arg);        \
  57 } while (0)
  58
  59 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
  60
  61 static int em28xx_deinit_isoc_audio(struct em28xx *dev)
  62 {
  63         int i;
  64
  65         dprintk("Stopping isoc\n");
  66         for (i = 0; i < dev->adev.num_urb; i++) {
  67                 struct urb *urb = dev->adev.urb[i];
  68
  69                 if (!irqs_disabled())
  70                         usb_kill_urb(urb);
  71                 else
  72                         usb_unlink_urb(urb);
  73         }
  74
  75         return 0;
  76 }
  77
  78 static void em28xx_audio_isocirq(struct urb *urb)
  79 {
  80         struct em28xx            *dev = urb->context;
  81         int                      i;
  82         unsigned int             oldptr;
  83         int                      period_elapsed = 0;
  84         int                      status;
  85         unsigned char            *cp;
  86         unsigned int             stride;
  87         struct snd_pcm_substream *substream;
  88         struct snd_pcm_runtime   *runtime;
  89
  90         if (dev->disconnected) {
  91                 dprintk("device disconnected while streaming. URB status=%d.\n",
  92                         urb->status);
  93                 atomic_set(&dev->adev.stream_started, 0);
  94                 return;
  95         }
  96
  97         switch (urb->status) {
  98         case 0:             /* success */
  99         case -ETIMEDOUT:    /* NAK */
 100                 break;
 101         case -ECONNRESET:   /* kill */
 102         case -ENOENT:
 103         case -ESHUTDOWN:
 104                 return;
 105         default:            /* error */
 106                 dprintk("urb completion error %d.\n", urb->status);
 107                 break;
 108         }
 109
 110         if (atomic_read(&dev->adev.stream_started) == 0)
 111                 return;
 112
 113         if (dev->adev.capture_pcm_substream) {
 114                 substream = dev->adev.capture_pcm_substream;
 115                 runtime = substream->runtime;
 116                 stride = runtime->frame_bits >> 3;
 117
 118                 for (i = 0; i < urb->number_of_packets; i++) {
 119                         int length =
 120                             urb->iso_frame_desc[i].actual_length / stride;
 121                         cp = (unsigned char *)urb->transfer_buffer +
 122                             urb->iso_frame_desc[i].offset;
 123
 124                         if (!length)
 125                                 continue;
 126
 127                         oldptr = dev->adev.hwptr_done_capture;
 128                         if (oldptr + length >= runtime->buffer_size) {
 129                                 unsigned int cnt =
 130                                     runtime->buffer_size - oldptr;
 131                                 memcpy(runtime->dma_area + oldptr * stride, cp,
 132                                        cnt * stride);
 133                                 memcpy(runtime->dma_area, cp + cnt * stride,
 134                                        length * stride - cnt * stride);
 135                         } else {
 136                                 memcpy(runtime->dma_area + oldptr * stride, cp,
 137                                        length * stride);
 138                         }
 139
 140                         snd_pcm_stream_lock(substream);
 141
 142                         dev->adev.hwptr_done_capture += length;
 143                         if (dev->adev.hwptr_done_capture >=
 144                             runtime->buffer_size)
 145                                 dev->adev.hwptr_done_capture -=
 146                                     runtime->buffer_size;
 147
 148                         dev->adev.capture_transfer_done += length;
 149                         if (dev->adev.capture_transfer_done >=
 150                             runtime->period_size) {
 151                                 dev->adev.capture_transfer_done -=
 152                                     runtime->period_size;
 153                                 period_elapsed = 1;
 154                         }
 155
 156                         snd_pcm_stream_unlock(substream);
 157                 }
 158                 if (period_elapsed)
 159                         snd_pcm_period_elapsed(substream);
 160         }
 161         urb->status = 0;
 162
 163         status = usb_submit_urb(urb, GFP_ATOMIC);
 164         if (status < 0)
 165                 dev_err(&dev->intf->dev,
 166                         "resubmit of audio urb failed (error=%i)\n",
 167                         status);
 168 }
 169
 170 static int em28xx_init_audio_isoc(struct em28xx *dev)
 171 {
 172         int       i, err;
 173
 174         dprintk("Starting isoc transfers\n");
 175
 176         /* Start streaming */
 177         for (i = 0; i < dev->adev.num_urb; i++) {
 178                 memset(dev->adev.transfer_buffer[i], 0x80,
 179                        dev->adev.urb[i]->transfer_buffer_length);
 180
 181                 err = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC);
 182                 if (err) {
 183                         dev_err(&dev->intf->dev,
 184                                 "submit of audio urb failed (error=%i)\n",
 185                                 err);
 186                         em28xx_deinit_isoc_audio(dev);
 187                         atomic_set(&dev->adev.stream_started, 0);
 188                         return err;
 189                 }
 190         }
 191
 192         return 0;
 193 }
 194
 195 static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
 196                                         size_t size)
 197 {
 198         struct em28xx *dev = snd_pcm_substream_chip(subs);
 199         struct snd_pcm_runtime *runtime = subs->runtime;
 200
 201         dprintk("Allocating vbuffer\n");
 202         if (runtime->dma_area) {
 203                 if (runtime->dma_bytes > size)
 204                         return 0;
 205
 206                 vfree(runtime->dma_area);
 207         }
 208         runtime->dma_area = vmalloc(size);
 209         if (!runtime->dma_area)
 210                 return -ENOMEM;
 211
 212         runtime->dma_bytes = size;
 213
 214         return 0;
 215 }
 216
 217 static const struct snd_pcm_hardware snd_em28xx_hw_capture = {
 218         .info = SNDRV_PCM_INFO_BLOCK_TRANSFER |
 219                 SNDRV_PCM_INFO_MMAP           |
 220                 SNDRV_PCM_INFO_INTERLEAVED    |
 221                 SNDRV_PCM_INFO_BATCH          |
 222                 SNDRV_PCM_INFO_MMAP_VALID,
 223
 224         .formats = SNDRV_PCM_FMTBIT_S16_LE,
 225
 226         .rates = SNDRV_PCM_RATE_48000,
 227
 228         .rate_min = 48000,
 229         .rate_max = 48000,
 230         .channels_min = 2,
 231         .channels_max = 2,
 232         .buffer_bytes_max = 62720 * 8,  /* just about the value in usbaudio.c */
 233
 234         /*
 235          * The period is 12.288 bytes. Allow a 10% of variation along its
 236          * value, in order to avoid overruns/underruns due to some clock
 237          * drift.
 238          *
 239          * FIXME: This period assumes 64 packets, and a 48000 PCM rate.
 240          * Calculate it dynamically.
 241          */
 242         .period_bytes_min = 11059,
 243         .period_bytes_max = 13516,
 244
 245         .periods_min = 2,
 246         .periods_max = 98,              /* 12544, */
 247 };
 248
 249 static int snd_em28xx_capture_open(struct snd_pcm_substream *substream)
 250 {
 251         struct em28xx *dev = snd_pcm_substream_chip(substream);
 252         struct snd_pcm_runtime *runtime = substream->runtime;
 253         int nonblock, ret = 0;
 254
 255         if (!dev) {
 256                 pr_err("em28xx-audio: BUG: em28xx can't find device struct. Can't proceed with open\n");
 257                 return -ENODEV;
 258         }
 259
 260         if (dev->disconnected)
 261                 return -ENODEV;
 262
 263         dprintk("opening device and trying to acquire exclusive lock\n");
 264
 265         nonblock = !!(substream->f_flags & O_NONBLOCK);
 266         if (nonblock) {
 267                 if (!mutex_trylock(&dev->lock))
 268                         return -EAGAIN;
 269         } else {
 270                 mutex_lock(&dev->lock);
 271         }
 272
 273         runtime->hw = snd_em28xx_hw_capture;
 274
 275         if (dev->adev.users == 0) {
 276                 if (!dev->alt || dev->is_audio_only) {
 277                         struct usb_device *udev;
 278
 279                         udev = interface_to_usbdev(dev->intf);
 280
 281                         if (dev->is_audio_only)
 282                                 /* audio is on a separate interface */
 283                                 dev->alt = 1;
 284                         else
 285                                 /* audio is on the same interface as video */
 286                                 dev->alt = 7;
 287                                 /*
 288                                  * FIXME: The intention seems to be to select
 289                                  * the alt setting with the largest
 290                                  * wMaxPacketSize for the video endpoint.
 291                                  * At least dev->alt should be used instead, but
 292                                  * we should probably not touch it at all if it
 293                                  * is already >0, because wMaxPacketSize of the
 294                                  * audio endpoints seems to be the same for all.
 295                                  */
 296                         dprintk("changing alternate number on interface %d to %d\n",
 297                                 dev->ifnum, dev->alt);
 298                         usb_set_interface(udev, dev->ifnum, dev->alt);
 299                 }
 300
 301                 /* Sets volume, mute, etc */
 302                 dev->mute = 0;
 303                 ret = em28xx_audio_analog_set(dev);
 304                 if (ret < 0)
 305                         goto err;
 306         }
 307
 308         kref_get(&dev->ref);
 309         dev->adev.users++;
 310         mutex_unlock(&dev->lock);
 311
 312         /* Dynamically adjust the period size */
 313         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
 314         snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
 315                                      dev->adev.period * 95 / 100,
 316                                      dev->adev.period * 105 / 100);
 317
 318         dev->adev.capture_pcm_substream = substream;
 319
 320         return 0;
 321 err:
 322         mutex_unlock(&dev->lock);
 323
 324         dev_err(&dev->intf->dev,
 325                 "Error while configuring em28xx mixer\n");
 326         return ret;
 327 }
 328
 329 static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream)
 330 {
 331         struct em28xx *dev = snd_pcm_substream_chip(substream);
 332
 333         dprintk("closing device\n");
 334
 335         dev->mute = 1;
 336         mutex_lock(&dev->lock);
 337         dev->adev.users--;
 338         if (atomic_read(&dev->adev.stream_started) > 0) {
 339                 atomic_set(&dev->adev.stream_started, 0);
 340                 schedule_work(&dev->adev.wq_trigger);
 341         }
 342
 343         em28xx_audio_analog_set(dev);
 344         if (substream->runtime->dma_area) {
 345                 dprintk("freeing\n");
 346                 vfree(substream->runtime->dma_area);
 347                 substream->runtime->dma_area = NULL;
 348         }
 349         mutex_unlock(&dev->lock);
 350         kref_put(&dev->ref, em28xx_free_device);
 351
 352         return 0;
 353 }
 354
 355 static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream,
 356                                         struct snd_pcm_hw_params *hw_params)
 357 {
 358         int ret;
 359         struct em28xx *dev = snd_pcm_substream_chip(substream);
 360
 361         if (dev->disconnected)
 362                 return -ENODEV;
 363
 364         dprintk("Setting capture parameters\n");
 365
 366         ret = snd_pcm_alloc_vmalloc_buffer(substream,
 367                                            params_buffer_bytes(hw_params));
 368         if (ret < 0)
 369                 return ret;
 370 #if 0
 371         /*
 372          * TODO: set up em28xx audio chip to deliver the correct audio format,
 373          * current default is 48000hz multiplexed => 96000hz mono
 374          * which shouldn't matter since analogue TV only supports mono
 375          */
 376         unsigned int channels, rate, format;
 377
 378         format = params_format(hw_params);
 379         rate = params_rate(hw_params);
 380         channels = params_channels(hw_params);
 381 #endif
 382
 383         return 0;
 384 }
 385
 386 static int snd_em28xx_hw_capture_free(struct snd_pcm_substream *substream)
 387 {
 388         struct em28xx *dev = snd_pcm_substream_chip(substream);
 389         struct em28xx_audio *adev = &dev->adev;
 390
 391         dprintk("Stop capture, if needed\n");
 392
 393         if (atomic_read(&adev->stream_started) > 0) {
 394                 atomic_set(&adev->stream_started, 0);
 395                 schedule_work(&adev->wq_trigger);
 396         }
 397
 398         return 0;
 399 }
 400
 401 static int snd_em28xx_prepare(struct snd_pcm_substream *substream)
 402 {
 403         struct em28xx *dev = snd_pcm_substream_chip(substream);
 404
 405         if (dev->disconnected)
 406                 return -ENODEV;
 407
 408         dev->adev.hwptr_done_capture = 0;
 409         dev->adev.capture_transfer_done = 0;
 410
 411         return 0;
 412 }
 413
 414 static void audio_trigger(struct work_struct *work)
 415 {
 416         struct em28xx_audio *adev =
 417                             container_of(work, struct em28xx_audio, wq_trigger);
 418         struct em28xx *dev = container_of(adev, struct em28xx, adev);
 419
 420         if (atomic_read(&adev->stream_started)) {
 421                 dprintk("starting capture");
 422                 em28xx_init_audio_isoc(dev);
 423         } else {
 424                 dprintk("stopping capture");
 425                 em28xx_deinit_isoc_audio(dev);
 426         }
 427 }
 428
 429 static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream,
 430                                       int cmd)
 431 {
 432         struct em28xx *dev = snd_pcm_substream_chip(substream);
 433         int retval = 0;
 434
 435         if (dev->disconnected)
 436                 return -ENODEV;
 437
 438         switch (cmd) {
 439         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */
 440         case SNDRV_PCM_TRIGGER_RESUME: /* fall through */
 441         case SNDRV_PCM_TRIGGER_START:
 442                 atomic_set(&dev->adev.stream_started, 1);
 443                 break;
 444         case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */
 445         case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */
 446         case SNDRV_PCM_TRIGGER_STOP:
 447                 atomic_set(&dev->adev.stream_started, 0);
 448                 break;
 449         default:
 450                 retval = -EINVAL;
 451         }
 452         schedule_work(&dev->adev.wq_trigger);
 453         return retval;
 454 }
 455
 456 static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream
 457                                                     *substream)
 458 {
 459         unsigned long flags;
 460         struct em28xx *dev;
 461         snd_pcm_uframes_t hwptr_done;
 462
 463         dev = snd_pcm_substream_chip(substream);
 464         if (dev->disconnected)
 465                 return SNDRV_PCM_POS_XRUN;
 466
 467         spin_lock_irqsave(&dev->adev.slock, flags);
 468         hwptr_done = dev->adev.hwptr_done_capture;
 469         spin_unlock_irqrestore(&dev->adev.slock, flags);
 470
 471         return hwptr_done;
 472 }
 473
 474 static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
 475                                              unsigned long offset)
 476 {
 477         void *pageptr = subs->runtime->dma_area + offset;
 478
 479         return vmalloc_to_page(pageptr);
 480 }
 481
 482 /*
 483  * AC97 volume control support
 484  */
 485 static int em28xx_vol_info(struct snd_kcontrol *kcontrol,
 486                            struct snd_ctl_elem_info *info)
 487 {
 488         struct em28xx *dev = snd_kcontrol_chip(kcontrol);
 489
 490         if (dev->disconnected)
 491                 return -ENODEV;
 492
 493         info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 494         info->count = 2;
 495         info->value.integer.min = 0;
 496         info->value.integer.max = 0x1f;
 497
 498         return 0;
 499 }
 500
 501 static int em28xx_vol_put(struct snd_kcontrol *kcontrol,
 502                           struct snd_ctl_elem_value *value)
 503 {
 504         struct em28xx *dev = snd_kcontrol_chip(kcontrol);
 505         struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
 506         u16 val = (0x1f - (value->value.integer.value[0] & 0x1f)) |
 507                   (0x1f - (value->value.integer.value[1] & 0x1f)) << 8;
 508         int nonblock = 0;
 509         int rc;
 510
 511         if (dev->disconnected)
 512                 return -ENODEV;
 513
 514         if (substream)
 515                 nonblock = !!(substream->f_flags & O_NONBLOCK);
 516         if (nonblock) {
 517                 if (!mutex_trylock(&dev->lock))
 518                         return -EAGAIN;
 519         } else {
 520                 mutex_lock(&dev->lock);
 521         }
 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         }
 561         val = em28xx_read_ac97(dev, kcontrol->private_value);
 562         mutex_unlock(&dev->lock);
 563         if (val < 0)
 564                 return val;
 565
 566         dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n",
 567                 (val & 0x8000) ? "muted " : "",
 568                 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
 569                 val, (int)kcontrol->private_value);
 570
 571         value->value.integer.value[0] = 0x1f - (val & 0x1f);
 572         value->value.integer.value[1] = 0x1f - ((val >> 8) & 0x1f);
 573
 574         return 0;
 575 }
 576
 577 static int em28xx_vol_put_mute(struct snd_kcontrol *kcontrol,
 578                                struct snd_ctl_elem_value *value)
 579 {
 580         struct em28xx *dev = snd_kcontrol_chip(kcontrol);
 581         u16 val = value->value.integer.value[0];
 582         struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
 583         int nonblock = 0;
 584         int rc;
 585
 586         if (dev->disconnected)
 587                 return -ENODEV;
 588
 589         if (substream)
 590                 nonblock = !!(substream->f_flags & O_NONBLOCK);
 591         if (nonblock) {
 592                 if (!mutex_trylock(&dev->lock))
 593                         return -EAGAIN;
 594         } else {
 595                 mutex_lock(&dev->lock);
 596         }
 597         rc = em28xx_read_ac97(dev, kcontrol->private_value);
 598         if (rc < 0)
 599                 goto err;
 600
 601         if (val)
 602                 rc &= 0x1f1f;
 603         else
 604                 rc |= 0x8000;
 605
 606         rc = em28xx_write_ac97(dev, kcontrol->private_value, rc);
 607         if (rc < 0)
 608                 goto err;
 609
 610         dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n",
 611                 (val & 0x8000) ? "muted " : "",
 612                 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
 613                 val, (int)kcontrol->private_value);
 614
 615 err:
 616         mutex_unlock(&dev->lock);
 617         return rc;
 618 }
 619
 620 static int em28xx_vol_get_mute(struct snd_kcontrol *kcontrol,
 621                                struct snd_ctl_elem_value *value)
 622 {
 623         struct em28xx *dev = snd_kcontrol_chip(kcontrol);
 624         struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
 625         int nonblock = 0;
 626         int val;
 627
 628         if (dev->disconnected)
 629                 return -ENODEV;
 630
 631         if (substream)
 632                 nonblock = !!(substream->f_flags & O_NONBLOCK);
 633         if (nonblock) {
 634                 if (!mutex_trylock(&dev->lock))
 635                         return -EAGAIN;
 636         } else {
 637                 mutex_lock(&dev->lock);
 638         }
 639         val = em28xx_read_ac97(dev, kcontrol->private_value);
 640         mutex_unlock(&dev->lock);
 641         if (val < 0)
 642                 return val;
 643
 644         if (val & 0x8000)
 645                 value->value.integer.value[0] = 0;
 646         else
 647                 value->value.integer.value[0] = 1;
 648
 649         dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n",
 650                 (val & 0x8000) ? "muted " : "",
 651                 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
 652                 val, (int)kcontrol->private_value);
 653
 654         return 0;
 655 }
 656
 657 static const DECLARE_TLV_DB_SCALE(em28xx_db_scale, -3450, 150, 0);
 658
 659 static int em28xx_cvol_new(struct snd_card *card, struct em28xx *dev,
 660                            char *name, int id)
 661 {
 662         int err;
 663         char ctl_name[44];
 664         struct snd_kcontrol *kctl;
 665         struct snd_kcontrol_new tmp;
 666
 667         memset(&tmp, 0, sizeof(tmp));
 668         tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 669         tmp.private_value = id,
 670         tmp.name  = ctl_name,
 671
 672         /* Add Mute Control */
 673         sprintf(ctl_name, "%s Switch", name);
 674         tmp.get  = em28xx_vol_get_mute;
 675         tmp.put  = em28xx_vol_put_mute;
 676         tmp.info = snd_ctl_boolean_mono_info;
 677         kctl = snd_ctl_new1(&tmp, dev);
 678         err = snd_ctl_add(card, kctl);
 679         if (err < 0)
 680                 return err;
 681         dprintk("Added control %s for ac97 volume control 0x%04x\n",
 682                 ctl_name, id);
 683
 684         memset(&tmp, 0, sizeof(tmp));
 685         tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 686         tmp.private_value = id,
 687         tmp.name  = ctl_name,
 688
 689         /* Add Volume Control */
 690         sprintf(ctl_name, "%s Volume", name);
 691         tmp.get   = em28xx_vol_get;
 692         tmp.put   = em28xx_vol_put;
 693         tmp.info  = em28xx_vol_info;
 694         tmp.tlv.p = em28xx_db_scale,
 695         kctl = snd_ctl_new1(&tmp, dev);
 696         err = snd_ctl_add(card, kctl);
 697         if (err < 0)
 698                 return err;
 699         dprintk("Added control %s for ac97 volume control 0x%04x\n",
 700                 ctl_name, id);
 701
 702         return 0;
 703 }
 704
 705 /*
 706  * register/unregister code and data
 707  */
 708 static const struct snd_pcm_ops snd_em28xx_pcm_capture = {
 709         .open      = snd_em28xx_capture_open,
 710         .close     = snd_em28xx_pcm_close,
 711         .ioctl     = snd_pcm_lib_ioctl,
 712         .hw_params = snd_em28xx_hw_capture_params,
 713         .hw_free   = snd_em28xx_hw_capture_free,
 714         .prepare   = snd_em28xx_prepare,
 715         .trigger   = snd_em28xx_capture_trigger,
 716         .pointer   = snd_em28xx_capture_pointer,
 717         .page      = snd_pcm_get_vmalloc_page,
 718 };
 719
 720 static void em28xx_audio_free_urb(struct em28xx *dev)
 721 {
 722         struct usb_device *udev = interface_to_usbdev(dev->intf);
 723         int i;
 724
 725         for (i = 0; i < dev->adev.num_urb; i++) {
 726                 struct urb *urb = dev->adev.urb[i];
 727
 728                 if (!urb)
 729                         continue;
 730
 731                 usb_free_coherent(udev, urb->transfer_buffer_length,
 732                                   dev->adev.transfer_buffer[i],
 733                                   urb->transfer_dma);
 734
 735                 usb_free_urb(urb);
 736         }
 737         kfree(dev->adev.urb);
 738         kfree(dev->adev.transfer_buffer);
 739         dev->adev.num_urb = 0;
 740 }
 741
 742 /* high bandwidth multiplier, as encoded in highspeed endpoint descriptors */
 743 static int em28xx_audio_ep_packet_size(struct usb_device *udev,
 744                                        struct usb_endpoint_descriptor *e)
 745 {
 746         int size = le16_to_cpu(e->wMaxPacketSize);
 747
 748         if (udev->speed == USB_SPEED_HIGH)
 749                 return (size & 0x7ff) *  (1 + (((size) >> 11) & 0x03));
 750
 751         return size & 0x7ff;
 752 }
 753
 754 static int em28xx_audio_urb_init(struct em28xx *dev)
 755 {
 756         struct usb_interface *intf;
 757         struct usb_endpoint_descriptor *e, *ep = NULL;
 758         struct usb_device *udev = interface_to_usbdev(dev->intf);
 759         int                 i, ep_size, interval, num_urb, npackets;
 760         int                 urb_size, bytes_per_transfer;
 761         u8 alt;
 762
 763         if (dev->ifnum)
 764                 alt = 1;
 765         else
 766                 alt = 7;
 767
 768         intf = usb_ifnum_to_if(udev, dev->ifnum);
 769
 770         if (intf->num_altsetting <= alt) {
 771                 dev_err(&dev->intf->dev, "alt %d doesn't exist on interface %d\n",
 772                         dev->ifnum, alt);
 773                 return -ENODEV;
 774         }
 775
 776         for (i = 0; i < intf->altsetting[alt].desc.bNumEndpoints; i++) {
 777                 e = &intf->altsetting[alt].endpoint[i].desc;
 778                 if (!usb_endpoint_dir_in(e))
 779                         continue;
 780                 if (e->bEndpointAddress == EM28XX_EP_AUDIO) {
 781                         ep = e;
 782                         break;
 783                 }
 784         }
 785
 786         if (!ep) {
 787                 dev_err(&dev->intf->dev, "Couldn't find an audio endpoint");
 788                 return -ENODEV;
 789         }
 790
 791         ep_size = em28xx_audio_ep_packet_size(udev, ep);
 792         interval = 1 << (ep->bInterval - 1);
 793
 794         dev_info(&dev->intf->dev,
 795                  "Endpoint 0x%02x %s on intf %d alt %d interval = %d, size %d\n",
 796                  EM28XX_EP_AUDIO, usb_speed_string(udev->speed),
 797                  dev->ifnum, alt, interval, ep_size);
 798
 799         /* Calculate the number and size of URBs to better fit the audio samples */
 800
 801         /*
 802          * Estimate the number of bytes per DMA transfer.
 803          *
 804          * This is given by the bit rate (for now, only 48000 Hz) multiplied
 805          * by 2 channels and 2 bytes/sample divided by the number of microframe
 806          * intervals and by the microframe rate (125 us)
 807          */
 808         bytes_per_transfer = DIV_ROUND_UP(48000 * 2 * 2, 125 * interval);
 809
 810         /*
 811          * Estimate the number of transfer URBs. Don't let it go past the
 812          * maximum number of URBs that is known to be supported by the device.
 813          */
 814         num_urb = DIV_ROUND_UP(bytes_per_transfer, ep_size);
 815         if (num_urb > EM28XX_MAX_AUDIO_BUFS)
 816                 num_urb = EM28XX_MAX_AUDIO_BUFS;
 817
 818         /*
 819          * Now that we know the number of bytes per transfer and the number of
 820          * URBs, estimate the typical size of an URB, in order to adjust the
 821          * minimal number of packets.
 822          */
 823         urb_size = bytes_per_transfer / num_urb;
 824
 825         /*
 826          * Now, calculate the amount of audio packets to be filled on each
 827          * URB. In order to preserve the old behaviour, use a minimal
 828          * threshold for this value.
 829          */
 830         npackets = EM28XX_MIN_AUDIO_PACKETS;
 831         if (urb_size > ep_size * npackets)
 832                 npackets = DIV_ROUND_UP(urb_size, ep_size);
 833
 834         dev_info(&dev->intf->dev,
 835                  "Number of URBs: %d, with %d packets and %d size\n",
 836                  num_urb, npackets, urb_size);
 837
 838         /* Estimate the bytes per period */
 839         dev->adev.period = urb_size * npackets;
 840
 841         /* Allocate space to store the number of URBs to be used */
 842
 843         dev->adev.transfer_buffer = kcalloc(num_urb,
 844                                             sizeof(*dev->adev.transfer_buffer),
 845                                             GFP_ATOMIC);
 846         if (!dev->adev.transfer_buffer)
 847                 return -ENOMEM;
 848
 849         dev->adev.urb = kcalloc(num_urb, sizeof(*dev->adev.urb), GFP_ATOMIC);
 850         if (!dev->adev.urb) {
 851                 kfree(dev->adev.transfer_buffer);
 852                 return -ENOMEM;
 853         }
 854
 855         /* Alloc memory for each URB and for each transfer buffer */
 856         dev->adev.num_urb = num_urb;
 857         for (i = 0; i < num_urb; i++) {
 858                 struct urb *urb;
 859                 int j, k;
 860                 void *buf;
 861
 862                 urb = usb_alloc_urb(npackets, GFP_ATOMIC);
 863                 if (!urb) {
 864                         em28xx_audio_free_urb(dev);
 865                         return -ENOMEM;
 866                 }
 867                 dev->adev.urb[i] = urb;
 868
 869                 buf = usb_alloc_coherent(udev, npackets * ep_size, GFP_ATOMIC,
 870                                          &urb->transfer_dma);
 871                 if (!buf) {
 872                         dev_err(&dev->intf->dev,
 873                                 "usb_alloc_coherent failed!\n");
 874                         em28xx_audio_free_urb(dev);
 875                         return -ENOMEM;
 876                 }
 877                 dev->adev.transfer_buffer[i] = buf;
 878
 879                 urb->dev = udev;
 880                 urb->context = dev;
 881                 urb->pipe = usb_rcvisocpipe(udev, EM28XX_EP_AUDIO);
 882                 urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
 883                 urb->transfer_buffer = buf;
 884                 urb->interval = interval;
 885                 urb->complete = em28xx_audio_isocirq;
 886                 urb->number_of_packets = npackets;
 887                 urb->transfer_buffer_length = ep_size * npackets;
 888
 889                 for (j = k = 0; j < npackets; j++, k += ep_size) {
 890                         urb->iso_frame_desc[j].offset = k;
 891                         urb->iso_frame_desc[j].length = ep_size;
 892                 }
 893         }
 894
 895         return 0;
 896 }
 897
 898 static int em28xx_audio_init(struct em28xx *dev)
 899 {
 900         struct em28xx_audio *adev = &dev->adev;
 901         struct usb_device *udev = interface_to_usbdev(dev->intf);
 902         struct snd_pcm      *pcm;
 903         struct snd_card     *card;
 904         static int          devnr;
 905         int                 err;
 906
 907         if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR) {
 908                 /*
 909                  * This device does not support the extension (in this case
 910                  * the device is expecting the snd-usb-audio module or
 911                  * doesn't have analog audio support at all)
 912                  */
 913                 return 0;
 914         }
 915
 916         dev_info(&dev->intf->dev, "Binding audio extension\n");
 917
 918         kref_get(&dev->ref);
 919
 920         dev_info(&dev->intf->dev,
 921                  "em28xx-audio.c: Copyright (C) 2006 Markus Rechberger\n");
 922         dev_info(&dev->intf->dev,
 923                  "em28xx-audio.c: Copyright (C) 2007-2016 Mauro Carvalho Chehab\n");
 924
 925         err = snd_card_new(&dev->intf->dev, index[devnr], "Em28xx Audio",
 926                            THIS_MODULE, 0, &card);
 927         if (err < 0)
 928                 return err;
 929
 930         spin_lock_init(&adev->slock);
 931         adev->sndcard = card;
 932         adev->udev = udev;
 933
 934         err = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm);
 935         if (err < 0)
 936                 goto card_free;
 937
 938         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_em28xx_pcm_capture);
 939         pcm->info_flags = 0;
 940         pcm->private_data = dev;
 941         strcpy(pcm->name, "Empia 28xx Capture");
 942
 943         strcpy(card->driver, "Em28xx-Audio");
 944         strcpy(card->shortname, "Em28xx Audio");
 945         strcpy(card->longname, "Empia Em28xx Audio");
 946
 947         INIT_WORK(&adev->wq_trigger, audio_trigger);
 948
 949         if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {
 950                 em28xx_cvol_new(card, dev, "Video", AC97_VIDEO);
 951                 em28xx_cvol_new(card, dev, "Line In", AC97_LINE);
 952                 em28xx_cvol_new(card, dev, "Phone", AC97_PHONE);
 953                 em28xx_cvol_new(card, dev, "Microphone", AC97_MIC);
 954                 em28xx_cvol_new(card, dev, "CD", AC97_CD);
 955                 em28xx_cvol_new(card, dev, "AUX", AC97_AUX);
 956                 em28xx_cvol_new(card, dev, "PCM", AC97_PCM);
 957
 958                 em28xx_cvol_new(card, dev, "Master", AC97_MASTER);
 959                 em28xx_cvol_new(card, dev, "Line", AC97_HEADPHONE);
 960                 em28xx_cvol_new(card, dev, "Mono", AC97_MASTER_MONO);
 961                 em28xx_cvol_new(card, dev, "LFE", AC97_CENTER_LFE_MASTER);
 962                 em28xx_cvol_new(card, dev, "Surround", AC97_SURROUND_MASTER);
 963         }
 964
 965         err = em28xx_audio_urb_init(dev);
 966         if (err)
 967                 goto card_free;
 968
 969         err = snd_card_register(card);
 970         if (err < 0)
 971                 goto urb_free;
 972
 973         dev_info(&dev->intf->dev, "Audio extension successfully initialized\n");
 974         return 0;
 975
 976 urb_free:
 977         em28xx_audio_free_urb(dev);
 978
 979 card_free:
 980         snd_card_free(card);
 981         adev->sndcard = NULL;
 982
 983         return err;
 984 }
 985
 986 static int em28xx_audio_fini(struct em28xx *dev)
 987 {
 988         if (!dev)
 989                 return 0;
 990
 991         if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR) {
 992                 /*
 993                  * This device does not support the extension (in this case
 994                  * the device is expecting the snd-usb-audio module or
 995                  * doesn't have analog audio support at all)
 996                  */
 997                 return 0;
 998         }
 999
1000         dev_info(&dev->intf->dev, "Closing audio extension\n");
1001
1002         if (dev->adev.sndcard) {
1003                 snd_card_disconnect(dev->adev.sndcard);
1004                 flush_work(&dev->adev.wq_trigger);
1005
1006                 em28xx_audio_free_urb(dev);
1007
1008                 snd_card_free(dev->adev.sndcard);
1009                 dev->adev.sndcard = NULL;
1010         }
1011
1012         kref_put(&dev->ref, em28xx_free_device);
1013         return 0;
1014 }
1015
1016 static int em28xx_audio_suspend(struct em28xx *dev)
1017 {
1018         if (!dev)
1019                 return 0;
1020
1021         if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR)
1022                 return 0;
1023
1024         dev_info(&dev->intf->dev, "Suspending audio extension\n");
1025         em28xx_deinit_isoc_audio(dev);
1026         atomic_set(&dev->adev.stream_started, 0);
1027         return 0;
1028 }
1029
1030 static int em28xx_audio_resume(struct em28xx *dev)
1031 {
1032         if (!dev)
1033                 return 0;
1034
1035         if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR)
1036                 return 0;
1037
1038         dev_info(&dev->intf->dev, "Resuming audio extension\n");
1039         /* Nothing to do other than schedule_work() ?? */
1040         schedule_work(&dev->adev.wq_trigger);
1041         return 0;
1042 }
1043
1044 static struct em28xx_ops audio_ops = {
1045         .id   = EM28XX_AUDIO,
1046         .name = "Em28xx Audio Extension",
1047         .init = em28xx_audio_init,
1048         .fini = em28xx_audio_fini,
1049         .suspend = em28xx_audio_suspend,
1050         .resume = em28xx_audio_resume,
1051 };
1052
1053 static int __init em28xx_alsa_register(void)
1054 {
1055         return em28xx_register_extension(&audio_ops);
1056 }
1057
1058 static void __exit em28xx_alsa_unregister(void)
1059 {
1060         em28xx_unregister_extension(&audio_ops);
1061 }
1062
1063 MODULE_LICENSE("GPL v2");
1064 MODULE_AUTHOR("Markus Rechberger <mrechberger@gmail.com>");
1065 MODULE_AUTHOR("Mauro Carvalho Chehab");
1066 MODULE_DESCRIPTION(DRIVER_DESC " - audio interface");
1067 MODULE_VERSION(EM28XX_VERSION);
1068
1069 module_init(em28xx_alsa_register);
1070 module_exit(em28xx_alsa_unregister);