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

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This source file includes following definitions.
em28xx_deinit_isoc_audio
em28xx_audio_isocirq
em28xx_init_audio_isoc
snd_pcm_alloc_vmalloc_buffer
snd_em28xx_capture_open
snd_em28xx_pcm_close
snd_em28xx_hw_capture_params
snd_em28xx_hw_capture_free
snd_em28xx_prepare
audio_trigger
snd_em28xx_capture_trigger
snd_em28xx_capture_pointer
snd_pcm_get_vmalloc_page
em28xx_vol_info
em28xx_vol_put
em28xx_vol_get
em28xx_vol_put_mute
em28xx_vol_get_mute
em28xx_cvol_new
em28xx_audio_free_urb
em28xx_audio_ep_packet_size
em28xx_audio_urb_init
em28xx_audio_init
em28xx_audio_fini
em28xx_audio_suspend
em28xx_audio_resume
em28xx_alsa_register
em28xx_alsa_unregister
   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                         unsigned long flags;
 120                         int length =
 121                             urb->iso_frame_desc[i].actual_length / stride;
 122                         cp = (unsigned char *)urb->transfer_buffer +
 123                             urb->iso_frame_desc[i].offset;
 124 
 125                         if (!length)
 126                                 continue;
 127 
 128                         oldptr = dev->adev.hwptr_done_capture;
 129                         if (oldptr + length >= runtime->buffer_size) {
 130                                 unsigned int cnt =
 131                                     runtime->buffer_size - oldptr;
 132                                 memcpy(runtime->dma_area + oldptr * stride, cp,
 133                                        cnt * stride);
 134                                 memcpy(runtime->dma_area, cp + cnt * stride,
 135                                        length * stride - cnt * stride);
 136                         } else {
 137                                 memcpy(runtime->dma_area + oldptr * stride, cp,
 138                                        length * stride);
 139                         }
 140 
 141                         snd_pcm_stream_lock_irqsave(substream, flags);
 142 
 143                         dev->adev.hwptr_done_capture += length;
 144                         if (dev->adev.hwptr_done_capture >=
 145                             runtime->buffer_size)
 146                                 dev->adev.hwptr_done_capture -=
 147                                     runtime->buffer_size;
 148 
 149                         dev->adev.capture_transfer_done += length;
 150                         if (dev->adev.capture_transfer_done >=
 151                             runtime->period_size) {
 152                                 dev->adev.capture_transfer_done -=
 153                                     runtime->period_size;
 154                                 period_elapsed = 1;
 155                         }
 156 
 157                         snd_pcm_stream_unlock_irqrestore(substream, flags);
 158                 }
 159                 if (period_elapsed)
 160                         snd_pcm_period_elapsed(substream);
 161         }
 162         urb->status = 0;
 163 
 164         status = usb_submit_urb(urb, GFP_ATOMIC);
 165         if (status < 0)
 166                 dev_err(&dev->intf->dev,
 167                         "resubmit of audio urb failed (error=%i)\n",
 168                         status);
 169 }
 170 
 171 static int em28xx_init_audio_isoc(struct em28xx *dev)
 172 {
 173         int       i, err;
 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                 err = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC);
 183                 if (err) {
 184                         dev_err(&dev->intf->dev,
 185                                 "submit of audio urb failed (error=%i)\n",
 186                                 err);
 187                         em28xx_deinit_isoc_audio(dev);
 188                         atomic_set(&dev->adev.stream_started, 0);
 189                         return err;
 190                 }
 191         }
 192 
 193         return 0;
 194 }
 195 
 196 static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
 197                                         size_t size)
 198 {
 199         struct em28xx *dev = snd_pcm_substream_chip(subs);
 200         struct snd_pcm_runtime *runtime = subs->runtime;
 201 
 202         dprintk("Allocating vbuffer\n");
 203         if (runtime->dma_area) {
 204                 if (runtime->dma_bytes > size)
 205                         return 0;
 206 
 207                 vfree(runtime->dma_area);
 208         }
 209         runtime->dma_area = vmalloc(size);
 210         if (!runtime->dma_area)
 211                 return -ENOMEM;
 212 
 213         runtime->dma_bytes = size;
 214 
 215         return 0;
 216 }
 217 
 218 static const struct snd_pcm_hardware snd_em28xx_hw_capture = {
 219         .info = SNDRV_PCM_INFO_BLOCK_TRANSFER |
 220                 SNDRV_PCM_INFO_MMAP           |
 221                 SNDRV_PCM_INFO_INTERLEAVED    |
 222                 SNDRV_PCM_INFO_BATCH          |
 223                 SNDRV_PCM_INFO_MMAP_VALID,
 224 
 225         .formats = SNDRV_PCM_FMTBIT_S16_LE,
 226 
 227         .rates = SNDRV_PCM_RATE_48000,
 228 
 229         .rate_min = 48000,
 230         .rate_max = 48000,
 231         .channels_min = 2,
 232         .channels_max = 2,
 233         .buffer_bytes_max = 62720 * 8,  /* just about the value in usbaudio.c */
 234 
 235         /*
 236          * The period is 12.288 bytes. Allow a 10% of variation along its
 237          * value, in order to avoid overruns/underruns due to some clock
 238          * drift.
 239          *
 240          * FIXME: This period assumes 64 packets, and a 48000 PCM rate.
 241          * Calculate it dynamically.
 242          */
 243         .period_bytes_min = 11059,
 244         .period_bytes_max = 13516,
 245 
 246         .periods_min = 2,
 247         .periods_max = 98,              /* 12544, */
 248 };
 249 
 250 static int snd_em28xx_capture_open(struct snd_pcm_substream *substream)
 251 {
 252         struct em28xx *dev = snd_pcm_substream_chip(substream);
 253         struct snd_pcm_runtime *runtime = substream->runtime;
 254         int nonblock, ret = 0;
 255 
 256         if (!dev) {
 257                 pr_err("em28xx-audio: BUG: em28xx can't find device struct. Can't proceed with open\n");
 258                 return -ENODEV;
 259         }
 260 
 261         if (dev->disconnected)
 262                 return -ENODEV;
 263 
 264         dprintk("opening device and trying to acquire exclusive lock\n");
 265 
 266         nonblock = !!(substream->f_flags & O_NONBLOCK);
 267         if (nonblock) {
 268                 if (!mutex_trylock(&dev->lock))
 269                         return -EAGAIN;
 270         } else {
 271                 mutex_lock(&dev->lock);
 272         }
 273 
 274         runtime->hw = snd_em28xx_hw_capture;
 275 
 276         if (dev->adev.users == 0) {
 277                 if (!dev->alt || dev->is_audio_only) {
 278                         struct usb_device *udev;
 279 
 280                         udev = interface_to_usbdev(dev->intf);
 281 
 282                         if (dev->is_audio_only)
 283                                 /* audio is on a separate interface */
 284                                 dev->alt = 1;
 285                         else
 286                                 /* audio is on the same interface as video */
 287                                 dev->alt = 7;
 288                                 /*
 289                                  * FIXME: The intention seems to be to select
 290                                  * the alt setting with the largest
 291                                  * wMaxPacketSize for the video endpoint.
 292                                  * At least dev->alt should be used instead, but
 293                                  * we should probably not touch it at all if it
 294                                  * is already >0, because wMaxPacketSize of the
 295                                  * audio endpoints seems to be the same for all.
 296                                  */
 297                         dprintk("changing alternate number on interface %d to %d\n",
 298                                 dev->ifnum, dev->alt);
 299                         usb_set_interface(udev, dev->ifnum, dev->alt);
 300                 }
 301 
 302                 /* Sets volume, mute, etc */
 303                 dev->mute = 0;
 304                 ret = em28xx_audio_analog_set(dev);
 305                 if (ret < 0)
 306                         goto err;
 307         }
 308 
 309         kref_get(&dev->ref);
 310         dev->adev.users++;
 311         mutex_unlock(&dev->lock);
 312 
 313         /* Dynamically adjust the period size */
 314         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
 315         snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
 316                                      dev->adev.period * 95 / 100,
 317                                      dev->adev.period * 105 / 100);
 318 
 319         dev->adev.capture_pcm_substream = substream;
 320 
 321         return 0;
 322 err:
 323         mutex_unlock(&dev->lock);
 324 
 325         dev_err(&dev->intf->dev,
 326                 "Error while configuring em28xx mixer\n");
 327         return ret;
 328 }
 329 
 330 static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream)
 331 {
 332         struct em28xx *dev = snd_pcm_substream_chip(substream);
 333 
 334         dprintk("closing device\n");
 335 
 336         dev->mute = 1;
 337         mutex_lock(&dev->lock);
 338         dev->adev.users--;
 339         if (atomic_read(&dev->adev.stream_started) > 0) {
 340                 atomic_set(&dev->adev.stream_started, 0);
 341                 schedule_work(&dev->adev.wq_trigger);
 342         }
 343 
 344         em28xx_audio_analog_set(dev);
 345         if (substream->runtime->dma_area) {
 346                 dprintk("freeing\n");
 347                 vfree(substream->runtime->dma_area);
 348                 substream->runtime->dma_area = NULL;
 349         }
 350         mutex_unlock(&dev->lock);
 351         kref_put(&dev->ref, em28xx_free_device);
 352 
 353         return 0;
 354 }
 355 
 356 static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream,
 357                                         struct snd_pcm_hw_params *hw_params)
 358 {
 359         int ret;
 360         struct em28xx *dev = snd_pcm_substream_chip(substream);
 361 
 362         if (dev->disconnected)
 363                 return -ENODEV;
 364 
 365         dprintk("Setting capture parameters\n");
 366 
 367         ret = snd_pcm_alloc_vmalloc_buffer(substream,
 368                                            params_buffer_bytes(hw_params));
 369         if (ret < 0)
 370                 return ret;
 371 #if 0
 372         /*
 373          * TODO: set up em28xx audio chip to deliver the correct audio format,
 374          * current default is 48000hz multiplexed => 96000hz mono
 375          * which shouldn't matter since analogue TV only supports mono
 376          */
 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         }
 523         rc = em28xx_read_ac97(dev, kcontrol->private_value);
 524         if (rc < 0)
 525                 goto err;
 526 
 527         val |= rc & 0x8000;     /* Preserve the mute flag */
 528 
 529         rc = em28xx_write_ac97(dev, kcontrol->private_value, val);
 530         if (rc < 0)
 531                 goto err;
 532 
 533         dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n",
 534                 (val & 0x8000) ? "muted " : "",
 535                 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
 536                 val, (int)kcontrol->private_value);
 537 
 538 err:
 539         mutex_unlock(&dev->lock);
 540         return rc;
 541 }
 542 
 543 static int em28xx_vol_get(struct snd_kcontrol *kcontrol,
 544                           struct snd_ctl_elem_value *value)
 545 {
 546         struct em28xx *dev = snd_kcontrol_chip(kcontrol);
 547         struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
 548         int nonblock = 0;
 549         int val;
 550 
 551         if (dev->disconnected)
 552                 return -ENODEV;
 553 
 554         if (substream)
 555                 nonblock = !!(substream->f_flags & O_NONBLOCK);
 556         if (nonblock) {
 557                 if (!mutex_trylock(&dev->lock))
 558                         return -EAGAIN;
 559         } else {
 560                 mutex_lock(&dev->lock);
 561         }
 562         val = em28xx_read_ac97(dev, kcontrol->private_value);
 563         mutex_unlock(&dev->lock);
 564         if (val < 0)
 565                 return val;
 566 
 567         dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n",
 568                 (val & 0x8000) ? "muted " : "",
 569                 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
 570                 val, (int)kcontrol->private_value);
 571 
 572         value->value.integer.value[0] = 0x1f - (val & 0x1f);
 573         value->value.integer.value[1] = 0x1f - ((val >> 8) & 0x1f);
 574 
 575         return 0;
 576 }
 577 
 578 static int em28xx_vol_put_mute(struct snd_kcontrol *kcontrol,
 579                                struct snd_ctl_elem_value *value)
 580 {
 581         struct em28xx *dev = snd_kcontrol_chip(kcontrol);
 582         u16 val = value->value.integer.value[0];
 583         struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
 584         int nonblock = 0;
 585         int rc;
 586 
 587         if (dev->disconnected)
 588                 return -ENODEV;
 589 
 590         if (substream)
 591                 nonblock = !!(substream->f_flags & O_NONBLOCK);
 592         if (nonblock) {
 593                 if (!mutex_trylock(&dev->lock))
 594                         return -EAGAIN;
 595         } else {
 596                 mutex_lock(&dev->lock);
 597         }
 598         rc = em28xx_read_ac97(dev, kcontrol->private_value);
 599         if (rc < 0)
 600                 goto err;
 601 
 602         if (val)
 603                 rc &= 0x1f1f;
 604         else
 605                 rc |= 0x8000;
 606 
 607         rc = em28xx_write_ac97(dev, kcontrol->private_value, rc);
 608         if (rc < 0)
 609                 goto err;
 610 
 611         dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n",
 612                 (val & 0x8000) ? "muted " : "",
 613                 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
 614                 val, (int)kcontrol->private_value);
 615 
 616 err:
 617         mutex_unlock(&dev->lock);
 618         return rc;
 619 }
 620 
 621 static int em28xx_vol_get_mute(struct snd_kcontrol *kcontrol,
 622                                struct snd_ctl_elem_value *value)
 623 {
 624         struct em28xx *dev = snd_kcontrol_chip(kcontrol);
 625         struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
 626         int nonblock = 0;
 627         int val;
 628 
 629         if (dev->disconnected)
 630                 return -ENODEV;
 631 
 632         if (substream)
 633                 nonblock = !!(substream->f_flags & O_NONBLOCK);
 634         if (nonblock) {
 635                 if (!mutex_trylock(&dev->lock))
 636                         return -EAGAIN;
 637         } else {
 638                 mutex_lock(&dev->lock);
 639         }
 640         val = em28xx_read_ac97(dev, kcontrol->private_value);
 641         mutex_unlock(&dev->lock);
 642         if (val < 0)
 643                 return val;
 644 
 645         if (val & 0x8000)
 646                 value->value.integer.value[0] = 0;
 647         else
 648                 value->value.integer.value[0] = 1;
 649 
 650         dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n",
 651                 (val & 0x8000) ? "muted " : "",
 652                 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
 653                 val, (int)kcontrol->private_value);
 654 
 655         return 0;
 656 }
 657 
 658 static const DECLARE_TLV_DB_SCALE(em28xx_db_scale, -3450, 150, 0);
 659 
 660 static int em28xx_cvol_new(struct snd_card *card, struct em28xx *dev,
 661                            char *name, int id)
 662 {
 663         int err;
 664         char ctl_name[44];
 665         struct snd_kcontrol *kctl;
 666         struct snd_kcontrol_new tmp;
 667 
 668         memset(&tmp, 0, sizeof(tmp));
 669         tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 670         tmp.private_value = id,
 671         tmp.name  = ctl_name,
 672 
 673         /* Add Mute Control */
 674         sprintf(ctl_name, "%s Switch", name);
 675         tmp.get  = em28xx_vol_get_mute;
 676         tmp.put  = em28xx_vol_put_mute;
 677         tmp.info = snd_ctl_boolean_mono_info;
 678         kctl = snd_ctl_new1(&tmp, dev);
 679         err = snd_ctl_add(card, kctl);
 680         if (err < 0)
 681                 return err;
 682         dprintk("Added control %s for ac97 volume control 0x%04x\n",
 683                 ctl_name, id);
 684 
 685         memset(&tmp, 0, sizeof(tmp));
 686         tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 687         tmp.private_value = id,
 688         tmp.name  = ctl_name,
 689 
 690         /* Add Volume Control */
 691         sprintf(ctl_name, "%s Volume", name);
 692         tmp.get   = em28xx_vol_get;
 693         tmp.put   = em28xx_vol_put;
 694         tmp.info  = em28xx_vol_info;
 695         tmp.tlv.p = em28xx_db_scale,
 696         kctl = snd_ctl_new1(&tmp, dev);
 697         err = snd_ctl_add(card, kctl);
 698         if (err < 0)
 699                 return err;
 700         dprintk("Added control %s for ac97 volume control 0x%04x\n",
 701                 ctl_name, id);
 702 
 703         return 0;
 704 }
 705 
 706 /*
 707  * register/unregister code and data
 708  */
 709 static const struct snd_pcm_ops snd_em28xx_pcm_capture = {
 710         .open      = snd_em28xx_capture_open,
 711         .close     = snd_em28xx_pcm_close,
 712         .ioctl     = snd_pcm_lib_ioctl,
 713         .hw_params = snd_em28xx_hw_capture_params,
 714         .hw_free   = snd_em28xx_hw_capture_free,
 715         .prepare   = snd_em28xx_prepare,
 716         .trigger   = snd_em28xx_capture_trigger,
 717         .pointer   = snd_em28xx_capture_pointer,
 718         .page      = snd_pcm_get_vmalloc_page,
 719 };
 720 
 721 static void em28xx_audio_free_urb(struct em28xx *dev)
 722 {
 723         struct usb_device *udev = interface_to_usbdev(dev->intf);
 724         int i;
 725 
 726         for (i = 0; i < dev->adev.num_urb; i++) {
 727                 struct urb *urb = dev->adev.urb[i];
 728 
 729                 if (!urb)
 730                         continue;
 731 
 732                 usb_free_coherent(udev, urb->transfer_buffer_length,
 733                                   dev->adev.transfer_buffer[i],
 734                                   urb->transfer_dma);
 735 
 736                 usb_free_urb(urb);
 737         }
 738         kfree(dev->adev.urb);
 739         kfree(dev->adev.transfer_buffer);
 740         dev->adev.num_urb = 0;
 741 }
 742 
 743 /* high bandwidth multiplier, as encoded in highspeed endpoint descriptors */
 744 static int em28xx_audio_ep_packet_size(struct usb_device *udev,
 745                                        struct usb_endpoint_descriptor *e)
 746 {
 747         int size = le16_to_cpu(e->wMaxPacketSize);
 748 
 749         if (udev->speed == USB_SPEED_HIGH)
 750                 return (size & 0x7ff) *  (1 + (((size) >> 11) & 0x03));
 751 
 752         return size & 0x7ff;
 753 }
 754 
 755 static int em28xx_audio_urb_init(struct em28xx *dev)
 756 {
 757         struct usb_interface *intf;
 758         struct usb_endpoint_descriptor *e, *ep = NULL;
 759         struct usb_device *udev = interface_to_usbdev(dev->intf);
 760         int                 i, ep_size, interval, num_urb, npackets;
 761         int                 urb_size, bytes_per_transfer;
 762         u8 alt;
 763 
 764         if (dev->ifnum)
 765                 alt = 1;
 766         else
 767                 alt = 7;
 768 
 769         intf = usb_ifnum_to_if(udev, dev->ifnum);
 770 
 771         if (intf->num_altsetting <= alt) {
 772                 dev_err(&dev->intf->dev, "alt %d doesn't exist on interface %d\n",
 773                         dev->ifnum, alt);
 774                 return -ENODEV;
 775         }
 776 
 777         for (i = 0; i < intf->altsetting[alt].desc.bNumEndpoints; i++) {
 778                 e = &intf->altsetting[alt].endpoint[i].desc;
 779                 if (!usb_endpoint_dir_in(e))
 780                         continue;
 781                 if (e->bEndpointAddress == EM28XX_EP_AUDIO) {
 782                         ep = e;
 783                         break;
 784                 }
 785         }
 786 
 787         if (!ep) {
 788                 dev_err(&dev->intf->dev, "Couldn't find an audio endpoint");
 789                 return -ENODEV;
 790         }
 791 
 792         ep_size = em28xx_audio_ep_packet_size(udev, ep);
 793         interval = 1 << (ep->bInterval - 1);
 794 
 795         dev_info(&dev->intf->dev,
 796                  "Endpoint 0x%02x %s on intf %d alt %d interval = %d, size %d\n",
 797                  EM28XX_EP_AUDIO, usb_speed_string(udev->speed),
 798                  dev->ifnum, alt, interval, ep_size);
 799 
 800         /* Calculate the number and size of URBs to better fit the audio samples */
 801 
 802         /*
 803          * Estimate the number of bytes per DMA transfer.
 804          *
 805          * This is given by the bit rate (for now, only 48000 Hz) multiplied
 806          * by 2 channels and 2 bytes/sample divided by the number of microframe
 807          * intervals and by the microframe rate (125 us)
 808          */
 809         bytes_per_transfer = DIV_ROUND_UP(48000 * 2 * 2, 125 * interval);
 810 
 811         /*
 812          * Estimate the number of transfer URBs. Don't let it go past the
 813          * maximum number of URBs that is known to be supported by the device.
 814          */
 815         num_urb = DIV_ROUND_UP(bytes_per_transfer, ep_size);
 816         if (num_urb > EM28XX_MAX_AUDIO_BUFS)
 817                 num_urb = EM28XX_MAX_AUDIO_BUFS;
 818 
 819         /*
 820          * Now that we know the number of bytes per transfer and the number of
 821          * URBs, estimate the typical size of an URB, in order to adjust the
 822          * minimal number of packets.
 823          */
 824         urb_size = bytes_per_transfer / num_urb;
 825 
 826         /*
 827          * Now, calculate the amount of audio packets to be filled on each
 828          * URB. In order to preserve the old behaviour, use a minimal
 829          * threshold for this value.
 830          */
 831         npackets = EM28XX_MIN_AUDIO_PACKETS;
 832         if (urb_size > ep_size * npackets)
 833                 npackets = DIV_ROUND_UP(urb_size, ep_size);
 834 
 835         dev_info(&dev->intf->dev,
 836                  "Number of URBs: %d, with %d packets and %d size\n",
 837                  num_urb, npackets, urb_size);
 838 
 839         /* Estimate the bytes per period */
 840         dev->adev.period = urb_size * npackets;
 841 
 842         /* Allocate space to store the number of URBs to be used */
 843 
 844         dev->adev.transfer_buffer = kcalloc(num_urb,
 845                                             sizeof(*dev->adev.transfer_buffer),
 846                                             GFP_KERNEL);
 847         if (!dev->adev.transfer_buffer)
 848                 return -ENOMEM;
 849 
 850         dev->adev.urb = kcalloc(num_urb, sizeof(*dev->adev.urb), GFP_KERNEL);
 851         if (!dev->adev.urb) {
 852                 kfree(dev->adev.transfer_buffer);
 853                 return -ENOMEM;
 854         }
 855 
 856         /* Alloc memory for each URB and for each transfer buffer */
 857         dev->adev.num_urb = num_urb;
 858         for (i = 0; i < num_urb; i++) {
 859                 struct urb *urb;
 860                 int j, k;
 861                 void *buf;
 862 
 863                 urb = usb_alloc_urb(npackets, GFP_KERNEL);
 864                 if (!urb) {
 865                         em28xx_audio_free_urb(dev);
 866                         return -ENOMEM;
 867                 }
 868                 dev->adev.urb[i] = urb;
 869 
 870                 buf = usb_alloc_coherent(udev, npackets * ep_size, GFP_KERNEL,
 871                                          &urb->transfer_dma);
 872                 if (!buf) {
 873                         dev_err(&dev->intf->dev,
 874                                 "usb_alloc_coherent failed!\n");
 875                         em28xx_audio_free_urb(dev);
 876                         return -ENOMEM;
 877                 }
 878                 dev->adev.transfer_buffer[i] = buf;
 879 
 880                 urb->dev = udev;
 881                 urb->context = dev;
 882                 urb->pipe = usb_rcvisocpipe(udev, EM28XX_EP_AUDIO);
 883                 urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
 884                 urb->transfer_buffer = buf;
 885                 urb->interval = interval;
 886                 urb->complete = em28xx_audio_isocirq;
 887                 urb->number_of_packets = npackets;
 888                 urb->transfer_buffer_length = ep_size * npackets;
 889 
 890                 for (j = k = 0; j < npackets; j++, k += ep_size) {
 891                         urb->iso_frame_desc[j].offset = k;
 892                         urb->iso_frame_desc[j].length = ep_size;
 893                 }
 894         }
 895 
 896         return 0;
 897 }
 898 
 899 static int em28xx_audio_init(struct em28xx *dev)
 900 {
 901         struct em28xx_audio *adev = &dev->adev;
 902         struct usb_device *udev = interface_to_usbdev(dev->intf);
 903         struct snd_pcm      *pcm;
 904         struct snd_card     *card;
 905         static int          devnr;
 906         int                 err;
 907 
 908         if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR) {
 909                 /*
 910                  * This device does not support the extension (in this case
 911                  * the device is expecting the snd-usb-audio module or
 912                  * doesn't have analog audio support at all)
 913                  */
 914                 return 0;
 915         }
 916 
 917         dev_info(&dev->intf->dev, "Binding audio extension\n");
 918 
 919         kref_get(&dev->ref);
 920 
 921         dev_info(&dev->intf->dev,
 922                  "em28xx-audio.c: Copyright (C) 2006 Markus Rechberger\n");
 923         dev_info(&dev->intf->dev,
 924                  "em28xx-audio.c: Copyright (C) 2007-2016 Mauro Carvalho Chehab\n");
 925 
 926         err = snd_card_new(&dev->intf->dev, index[devnr], "Em28xx Audio",
 927                            THIS_MODULE, 0, &card);
 928         if (err < 0)
 929                 return err;
 930 
 931         spin_lock_init(&adev->slock);
 932         adev->sndcard = card;
 933         adev->udev = udev;
 934 
 935         err = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm);
 936         if (err < 0)
 937                 goto card_free;
 938 
 939         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_em28xx_pcm_capture);
 940         pcm->info_flags = 0;
 941         pcm->private_data = dev;
 942         strscpy(pcm->name, "Empia 28xx Capture", sizeof(pcm->name));
 943 
 944         strscpy(card->driver, "Em28xx-Audio", sizeof(card->driver));
 945         strscpy(card->shortname, "Em28xx Audio", sizeof(card->shortname));
 946         strscpy(card->longname, "Empia Em28xx Audio", sizeof(card->longname));
 947 
 948         INIT_WORK(&adev->wq_trigger, audio_trigger);
 949 
 950         if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {
 951                 em28xx_cvol_new(card, dev, "Video", AC97_VIDEO);
 952                 em28xx_cvol_new(card, dev, "Line In", AC97_LINE);
 953                 em28xx_cvol_new(card, dev, "Phone", AC97_PHONE);
 954                 em28xx_cvol_new(card, dev, "Microphone", AC97_MIC);
 955                 em28xx_cvol_new(card, dev, "CD", AC97_CD);
 956                 em28xx_cvol_new(card, dev, "AUX", AC97_AUX);
 957                 em28xx_cvol_new(card, dev, "PCM", AC97_PCM);
 958 
 959                 em28xx_cvol_new(card, dev, "Master", AC97_MASTER);
 960                 em28xx_cvol_new(card, dev, "Line", AC97_HEADPHONE);
 961                 em28xx_cvol_new(card, dev, "Mono", AC97_MASTER_MONO);
 962                 em28xx_cvol_new(card, dev, "LFE", AC97_CENTER_LFE_MASTER);
 963                 em28xx_cvol_new(card, dev, "Surround", AC97_SURROUND_MASTER);
 964         }
 965 
 966         err = em28xx_audio_urb_init(dev);
 967         if (err)
 968                 goto card_free;
 969 
 970         err = snd_card_register(card);
 971         if (err < 0)
 972                 goto urb_free;
 973 
 974         dev_info(&dev->intf->dev, "Audio extension successfully initialized\n");
 975         return 0;
 976 
 977 urb_free:
 978         em28xx_audio_free_urb(dev);
 979 
 980 card_free:
 981         snd_card_free(card);
 982         adev->sndcard = NULL;
 983 
 984         return err;
 985 }
 986 
 987 static int em28xx_audio_fini(struct em28xx *dev)
 988 {
 989         if (!dev)
 990                 return 0;
 991 
 992         if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR) {
 993                 /*
 994                  * This device does not support the extension (in this case
 995                  * the device is expecting the snd-usb-audio module or
 996                  * doesn't have analog audio support at all)
 997                  */
 998                 return 0;
 999         }
1000 
1001         dev_info(&dev->intf->dev, "Closing audio extension\n");
1002 
1003         if (dev->adev.sndcard) {
1004                 snd_card_disconnect(dev->adev.sndcard);
1005                 flush_work(&dev->adev.wq_trigger);
1006 
1007                 em28xx_audio_free_urb(dev);
1008 
1009                 snd_card_free(dev->adev.sndcard);
1010                 dev->adev.sndcard = NULL;
1011         }
1012 
1013         kref_put(&dev->ref, em28xx_free_device);
1014         return 0;
1015 }
1016 
1017 static int em28xx_audio_suspend(struct em28xx *dev)
1018 {
1019         if (!dev)
1020                 return 0;
1021 
1022         if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR)
1023                 return 0;
1024 
1025         dev_info(&dev->intf->dev, "Suspending audio extension\n");
1026         em28xx_deinit_isoc_audio(dev);
1027         atomic_set(&dev->adev.stream_started, 0);
1028         return 0;
1029 }
1030 
1031 static int em28xx_audio_resume(struct em28xx *dev)
1032 {
1033         if (!dev)
1034                 return 0;
1035 
1036         if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR)
1037                 return 0;
1038 
1039         dev_info(&dev->intf->dev, "Resuming audio extension\n");
1040         /* Nothing to do other than schedule_work() ?? */
1041         schedule_work(&dev->adev.wq_trigger);
1042         return 0;
1043 }
1044 
1045 static struct em28xx_ops audio_ops = {
1046         .id   = EM28XX_AUDIO,
1047         .name = "Em28xx Audio Extension",
1048         .init = em28xx_audio_init,
1049         .fini = em28xx_audio_fini,
1050         .suspend = em28xx_audio_suspend,
1051         .resume = em28xx_audio_resume,
1052 };
1053 
1054 static int __init em28xx_alsa_register(void)
1055 {
1056         return em28xx_register_extension(&audio_ops);
1057 }
1058 
1059 static void __exit em28xx_alsa_unregister(void)
1060 {
1061         em28xx_unregister_extension(&audio_ops);
1062 }
1063 
1064 MODULE_LICENSE("GPL v2");
1065 MODULE_AUTHOR("Markus Rechberger <mrechberger@gmail.com>");
1066 MODULE_AUTHOR("Mauro Carvalho Chehab");
1067 MODULE_DESCRIPTION(DRIVER_DESC " - audio interface");
1068 MODULE_VERSION(EM28XX_VERSION);
1069 
1070 module_init(em28xx_alsa_register);
1071 module_exit(em28xx_alsa_unregister);
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/media/usb/em28xx/em28xx-audio.c

DEFINITIONS
