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