sound/usb/caiaq/audio.c

   1 /*
   2  *   Copyright (c) 2006-2008 Daniel Mack, Karsten Wiese
   3  *
   4  *   This program is free software; you can redistribute it and/or modify
   5  *   it under the terms of the GNU General Public License as published by
   6  *   the Free Software Foundation; either version 2 of the License, or
   7  *   (at your option) any later version.
   8  *
   9  *   This program is distributed in the hope that it will be useful,
  10  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *   GNU General Public License for more details.
  13  *
  14  *   You should have received a copy of the GNU General Public License
  15  *   along with this program; if not, write to the Free Software
  16  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  17 */
  18
  19 #include <linux/device.h>
  20 #include <linux/spinlock.h>
  21 #include <linux/slab.h>
  22 #include <linux/init.h>
  23 #include <linux/usb.h>
  24 #include <sound/core.h>
  25 #include <sound/pcm.h>
  26
  27 #include "device.h"
  28 #include "audio.h"
  29
  30 #define N_URBS                  32
  31 #define CLOCK_DRIFT_TOLERANCE   5
  32 #define FRAMES_PER_URB          8
  33 #define BYTES_PER_FRAME         512
  34 #define CHANNELS_PER_STREAM     2
  35 #define BYTES_PER_SAMPLE        3
  36 #define BYTES_PER_SAMPLE_USB    4
  37 #define MAX_BUFFER_SIZE         (128*1024)
  38 #define MAX_ENDPOINT_SIZE       512
  39
  40 #define ENDPOINT_CAPTURE        2
  41 #define ENDPOINT_PLAYBACK       6
  42
  43 #define MAKE_CHECKBYTE(cdev,stream,i) \
  44         (stream << 1) | (~(i / (cdev->n_streams * BYTES_PER_SAMPLE_USB)) & 1)
  45
  46 static struct snd_pcm_hardware snd_usb_caiaq_pcm_hardware = {
  47         .info           = (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
  48                            SNDRV_PCM_INFO_BLOCK_TRANSFER),
  49         .formats        = SNDRV_PCM_FMTBIT_S24_3BE,
  50         .rates          = (SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 |
  51                            SNDRV_PCM_RATE_96000),
  52         .rate_min       = 44100,
  53         .rate_max       = 0, /* will overwrite later */
  54         .channels_min   = CHANNELS_PER_STREAM,
  55         .channels_max   = CHANNELS_PER_STREAM,
  56         .buffer_bytes_max = MAX_BUFFER_SIZE,
  57         .period_bytes_min = 128,
  58         .period_bytes_max = MAX_BUFFER_SIZE,
  59         .periods_min    = 1,
  60         .periods_max    = 1024,
  61 };
  62
  63 static void
  64 activate_substream(struct snd_usb_caiaqdev *cdev,
  65                    struct snd_pcm_substream *sub)
  66 {
  67         spin_lock(&cdev->spinlock);
  68
  69         if (sub->stream == SNDRV_PCM_STREAM_PLAYBACK)
  70                 cdev->sub_playback[sub->number] = sub;
  71         else
  72                 cdev->sub_capture[sub->number] = sub;
  73
  74         spin_unlock(&cdev->spinlock);
  75 }
  76
  77 static void
  78 deactivate_substream(struct snd_usb_caiaqdev *cdev,
  79                      struct snd_pcm_substream *sub)
  80 {
  81         unsigned long flags;
  82         spin_lock_irqsave(&cdev->spinlock, flags);
  83
  84         if (sub->stream == SNDRV_PCM_STREAM_PLAYBACK)
  85                 cdev->sub_playback[sub->number] = NULL;
  86         else
  87                 cdev->sub_capture[sub->number] = NULL;
  88
  89         spin_unlock_irqrestore(&cdev->spinlock, flags);
  90 }
  91
  92 static int
  93 all_substreams_zero(struct snd_pcm_substream **subs)
  94 {
  95         int i;
  96         for (i = 0; i < MAX_STREAMS; i++)
  97                 if (subs[i] != NULL)
  98                         return 0;
  99         return 1;
 100 }
 101
 102 static int stream_start(struct snd_usb_caiaqdev *cdev)
 103 {
 104         int i, ret;
 105         struct device *dev = caiaqdev_to_dev(cdev);
 106
 107         dev_dbg(dev, "%s(%p)\n", __func__, cdev);
 108
 109         if (cdev->streaming)
 110                 return -EINVAL;
 111
 112         memset(cdev->sub_playback, 0, sizeof(cdev->sub_playback));
 113         memset(cdev->sub_capture, 0, sizeof(cdev->sub_capture));
 114         cdev->input_panic = 0;
 115         cdev->output_panic = 0;
 116         cdev->first_packet = 4;
 117         cdev->streaming = 1;
 118         cdev->warned = 0;
 119
 120         for (i = 0; i < N_URBS; i++) {
 121                 ret = usb_submit_urb(cdev->data_urbs_in[i], GFP_ATOMIC);
 122                 if (ret) {
 123                         dev_err(dev, "unable to trigger read #%d! (ret %d)\n",
 124                                 i, ret);
 125                         cdev->streaming = 0;
 126                         return -EPIPE;
 127                 }
 128         }
 129
 130         return 0;
 131 }
 132
 133 static void stream_stop(struct snd_usb_caiaqdev *cdev)
 134 {
 135         int i;
 136         struct device *dev = caiaqdev_to_dev(cdev);
 137
 138         dev_dbg(dev, "%s(%p)\n", __func__, cdev);
 139         if (!cdev->streaming)
 140                 return;
 141
 142         cdev->streaming = 0;
 143
 144         for (i = 0; i < N_URBS; i++) {
 145                 usb_kill_urb(cdev->data_urbs_in[i]);
 146
 147                 if (test_bit(i, &cdev->outurb_active_mask))
 148                         usb_kill_urb(cdev->data_urbs_out[i]);
 149         }
 150
 151         cdev->outurb_active_mask = 0;
 152 }
 153
 154 static int snd_usb_caiaq_substream_open(struct snd_pcm_substream *substream)
 155 {
 156         struct snd_usb_caiaqdev *cdev = snd_pcm_substream_chip(substream);
 157         struct device *dev = caiaqdev_to_dev(cdev);
 158
 159         dev_dbg(dev, "%s(%p)\n", __func__, substream);
 160         substream->runtime->hw = cdev->pcm_info;
 161         snd_pcm_limit_hw_rates(substream->runtime);
 162
 163         return 0;
 164 }
 165
 166 static int snd_usb_caiaq_substream_close(struct snd_pcm_substream *substream)
 167 {
 168         struct snd_usb_caiaqdev *cdev = snd_pcm_substream_chip(substream);
 169         struct device *dev = caiaqdev_to_dev(cdev);
 170
 171         dev_dbg(dev, "%s(%p)\n", __func__, substream);
 172         if (all_substreams_zero(cdev->sub_playback) &&
 173             all_substreams_zero(cdev->sub_capture)) {
 174                 /* when the last client has stopped streaming,
 175                  * all sample rates are allowed again */
 176                 stream_stop(cdev);
 177                 cdev->pcm_info.rates = cdev->samplerates;
 178         }
 179
 180         return 0;
 181 }
 182
 183 static int snd_usb_caiaq_pcm_hw_params(struct snd_pcm_substream *sub,
 184                                        struct snd_pcm_hw_params *hw_params)
 185 {
 186         return snd_pcm_lib_alloc_vmalloc_buffer(sub,
 187                                                 params_buffer_bytes(hw_params));
 188 }
 189
 190 static int snd_usb_caiaq_pcm_hw_free(struct snd_pcm_substream *sub)
 191 {
 192         struct snd_usb_caiaqdev *cdev = snd_pcm_substream_chip(sub);
 193         deactivate_substream(cdev, sub);
 194         return snd_pcm_lib_free_vmalloc_buffer(sub);
 195 }
 196
 197 /* this should probably go upstream */
 198 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
 199 #error "Change this table"
 200 #endif
 201
 202 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
 203                                 48000, 64000, 88200, 96000, 176400, 192000 };
 204
 205 static int snd_usb_caiaq_pcm_prepare(struct snd_pcm_substream *substream)
 206 {
 207         int bytes_per_sample, bpp, ret, i;
 208         int index = substream->number;
 209         struct snd_usb_caiaqdev *cdev = snd_pcm_substream_chip(substream);
 210         struct snd_pcm_runtime *runtime = substream->runtime;
 211         struct device *dev = caiaqdev_to_dev(cdev);
 212
 213         dev_dbg(dev, "%s(%p)\n", __func__, substream);
 214
 215         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 216                 int out_pos;
 217
 218                 switch (cdev->spec.data_alignment) {
 219                 case 0:
 220                 case 2:
 221                         out_pos = BYTES_PER_SAMPLE + 1;
 222                         break;
 223                 case 3:
 224                 default:
 225                         out_pos = 0;
 226                         break;
 227                 }
 228
 229                 cdev->period_out_count[index] = out_pos;
 230                 cdev->audio_out_buf_pos[index] = out_pos;
 231         } else {
 232                 int in_pos;
 233
 234                 switch (cdev->spec.data_alignment) {
 235                 case 0:
 236                         in_pos = BYTES_PER_SAMPLE + 2;
 237                         break;
 238                 case 2:
 239                         in_pos = BYTES_PER_SAMPLE;
 240                         break;
 241                 case 3:
 242                 default:
 243                         in_pos = 0;
 244                         break;
 245                 }
 246
 247                 cdev->period_in_count[index] = in_pos;
 248                 cdev->audio_in_buf_pos[index] = in_pos;
 249         }
 250
 251         if (cdev->streaming)
 252                 return 0;
 253
 254         /* the first client that opens a stream defines the sample rate
 255          * setting for all subsequent calls, until the last client closed. */
 256         for (i=0; i < ARRAY_SIZE(rates); i++)
 257                 if (runtime->rate == rates[i])
 258                         cdev->pcm_info.rates = 1 << i;
 259
 260         snd_pcm_limit_hw_rates(runtime);
 261
 262         bytes_per_sample = BYTES_PER_SAMPLE;
 263         if (cdev->spec.data_alignment >= 2)
 264                 bytes_per_sample++;
 265
 266         bpp = ((runtime->rate / 8000) + CLOCK_DRIFT_TOLERANCE)
 267                 * bytes_per_sample * CHANNELS_PER_STREAM * cdev->n_streams;
 268
 269         if (bpp > MAX_ENDPOINT_SIZE)
 270                 bpp = MAX_ENDPOINT_SIZE;
 271
 272         ret = snd_usb_caiaq_set_audio_params(cdev, runtime->rate,
 273                                              runtime->sample_bits, bpp);
 274         if (ret)
 275                 return ret;
 276
 277         ret = stream_start(cdev);
 278         if (ret)
 279                 return ret;
 280
 281         cdev->output_running = 0;
 282         wait_event_timeout(cdev->prepare_wait_queue, cdev->output_running, HZ);
 283         if (!cdev->output_running) {
 284                 stream_stop(cdev);
 285                 return -EPIPE;
 286         }
 287
 288         return 0;
 289 }
 290
 291 static int snd_usb_caiaq_pcm_trigger(struct snd_pcm_substream *sub, int cmd)
 292 {
 293         struct snd_usb_caiaqdev *cdev = snd_pcm_substream_chip(sub);
 294         struct device *dev = caiaqdev_to_dev(cdev);
 295
 296         dev_dbg(dev, "%s(%p) cmd %d\n", __func__, sub, cmd);
 297
 298         switch (cmd) {
 299         case SNDRV_PCM_TRIGGER_START:
 300         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 301                 activate_substream(cdev, sub);
 302                 break;
 303         case SNDRV_PCM_TRIGGER_STOP:
 304         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 305                 deactivate_substream(cdev, sub);
 306                 break;
 307         default:
 308                 return -EINVAL;
 309         }
 310
 311         return 0;
 312 }
 313
 314 static snd_pcm_uframes_t
 315 snd_usb_caiaq_pcm_pointer(struct snd_pcm_substream *sub)
 316 {
 317         int index = sub->number;
 318         struct snd_usb_caiaqdev *cdev = snd_pcm_substream_chip(sub);
 319         snd_pcm_uframes_t ptr;
 320
 321         spin_lock(&cdev->spinlock);
 322
 323         if (cdev->input_panic || cdev->output_panic) {
 324                 ptr = SNDRV_PCM_POS_XRUN;
 325                 goto unlock;
 326         }
 327
 328         if (sub->stream == SNDRV_PCM_STREAM_PLAYBACK)
 329                 ptr = bytes_to_frames(sub->runtime,
 330                                         cdev->audio_out_buf_pos[index]);
 331         else
 332                 ptr = bytes_to_frames(sub->runtime,
 333                                         cdev->audio_in_buf_pos[index]);
 334
 335 unlock:
 336         spin_unlock(&cdev->spinlock);
 337         return ptr;
 338 }
 339
 340 /* operators for both playback and capture */
 341 static const struct snd_pcm_ops snd_usb_caiaq_ops = {
 342         .open =         snd_usb_caiaq_substream_open,
 343         .close =        snd_usb_caiaq_substream_close,
 344         .ioctl =        snd_pcm_lib_ioctl,
 345         .hw_params =    snd_usb_caiaq_pcm_hw_params,
 346         .hw_free =      snd_usb_caiaq_pcm_hw_free,
 347         .prepare =      snd_usb_caiaq_pcm_prepare,
 348         .trigger =      snd_usb_caiaq_pcm_trigger,
 349         .pointer =      snd_usb_caiaq_pcm_pointer,
 350         .page =         snd_pcm_lib_get_vmalloc_page,
 351 };
 352
 353 static void check_for_elapsed_periods(struct snd_usb_caiaqdev *cdev,
 354                                       struct snd_pcm_substream **subs)
 355 {
 356         int stream, pb, *cnt;
 357         struct snd_pcm_substream *sub;
 358
 359         for (stream = 0; stream < cdev->n_streams; stream++) {
 360                 sub = subs[stream];
 361                 if (!sub)
 362                         continue;
 363
 364                 pb = snd_pcm_lib_period_bytes(sub);
 365                 cnt = (sub->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
 366                                         &cdev->period_out_count[stream] :
 367                                         &cdev->period_in_count[stream];
 368
 369                 if (*cnt >= pb) {
 370                         snd_pcm_period_elapsed(sub);
 371                         *cnt %= pb;
 372                 }
 373         }
 374 }
 375
 376 static void read_in_urb_mode0(struct snd_usb_caiaqdev *cdev,
 377                               const struct urb *urb,
 378                               const struct usb_iso_packet_descriptor *iso)
 379 {
 380         unsigned char *usb_buf = urb->transfer_buffer + iso->offset;
 381         struct snd_pcm_substream *sub;
 382         int stream, i;
 383
 384         if (all_substreams_zero(cdev->sub_capture))
 385                 return;
 386
 387         for (i = 0; i < iso->actual_length;) {
 388                 for (stream = 0; stream < cdev->n_streams; stream++, i++) {
 389                         sub = cdev->sub_capture[stream];
 390                         if (sub) {
 391                                 struct snd_pcm_runtime *rt = sub->runtime;
 392                                 char *audio_buf = rt->dma_area;
 393                                 int sz = frames_to_bytes(rt, rt->buffer_size);
 394                                 audio_buf[cdev->audio_in_buf_pos[stream]++]
 395                                         = usb_buf[i];
 396                                 cdev->period_in_count[stream]++;
 397                                 if (cdev->audio_in_buf_pos[stream] == sz)
 398                                         cdev->audio_in_buf_pos[stream] = 0;
 399                         }
 400                 }
 401         }
 402 }
 403
 404 static void read_in_urb_mode2(struct snd_usb_caiaqdev *cdev,
 405                               const struct urb *urb,
 406                               const struct usb_iso_packet_descriptor *iso)
 407 {
 408         unsigned char *usb_buf = urb->transfer_buffer + iso->offset;
 409         unsigned char check_byte;
 410         struct snd_pcm_substream *sub;
 411         int stream, i;
 412
 413         for (i = 0; i < iso->actual_length;) {
 414                 if (i % (cdev->n_streams * BYTES_PER_SAMPLE_USB) == 0) {
 415                         for (stream = 0;
 416                              stream < cdev->n_streams;
 417                              stream++, i++) {
 418                                 if (cdev->first_packet)
 419                                         continue;
 420
 421                                 check_byte = MAKE_CHECKBYTE(cdev, stream, i);
 422
 423                                 if ((usb_buf[i] & 0x3f) != check_byte)
 424                                         cdev->input_panic = 1;
 425
 426                                 if (usb_buf[i] & 0x80)
 427                                         cdev->output_panic = 1;
 428                         }
 429                 }
 430                 cdev->first_packet = 0;
 431
 432                 for (stream = 0; stream < cdev->n_streams; stream++, i++) {
 433                         sub = cdev->sub_capture[stream];
 434                         if (cdev->input_panic)
 435                                 usb_buf[i] = 0;
 436
 437                         if (sub) {
 438                                 struct snd_pcm_runtime *rt = sub->runtime;
 439                                 char *audio_buf = rt->dma_area;
 440                                 int sz = frames_to_bytes(rt, rt->buffer_size);
 441                                 audio_buf[cdev->audio_in_buf_pos[stream]++] =
 442                                         usb_buf[i];
 443                                 cdev->period_in_count[stream]++;
 444                                 if (cdev->audio_in_buf_pos[stream] == sz)
 445                                         cdev->audio_in_buf_pos[stream] = 0;
 446                         }
 447                 }
 448         }
 449 }
 450
 451 static void read_in_urb_mode3(struct snd_usb_caiaqdev *cdev,
 452                               const struct urb *urb,
 453                               const struct usb_iso_packet_descriptor *iso)
 454 {
 455         unsigned char *usb_buf = urb->transfer_buffer + iso->offset;
 456         struct device *dev = caiaqdev_to_dev(cdev);
 457         int stream, i;
 458
 459         /* paranoia check */
 460         if (iso->actual_length % (BYTES_PER_SAMPLE_USB * CHANNELS_PER_STREAM))
 461                 return;
 462
 463         for (i = 0; i < iso->actual_length;) {
 464                 for (stream = 0; stream < cdev->n_streams; stream++) {
 465                         struct snd_pcm_substream *sub = cdev->sub_capture[stream];
 466                         char *audio_buf = NULL;
 467                         int c, n, sz = 0;
 468
 469                         if (sub && !cdev->input_panic) {
 470                                 struct snd_pcm_runtime *rt = sub->runtime;
 471                                 audio_buf = rt->dma_area;
 472                                 sz = frames_to_bytes(rt, rt->buffer_size);
 473                         }
 474
 475                         for (c = 0; c < CHANNELS_PER_STREAM; c++) {
 476                                 /* 3 audio data bytes, followed by 1 check byte */
 477                                 if (audio_buf) {
 478                                         for (n = 0; n < BYTES_PER_SAMPLE; n++) {
 479                                                 audio_buf[cdev->audio_in_buf_pos[stream]++] = usb_buf[i+n];
 480
 481                                                 if (cdev->audio_in_buf_pos[stream] == sz)
 482                                                         cdev->audio_in_buf_pos[stream] = 0;
 483                                         }
 484
 485                                         cdev->period_in_count[stream] += BYTES_PER_SAMPLE;
 486                                 }
 487
 488                                 i += BYTES_PER_SAMPLE;
 489
 490                                 if (usb_buf[i] != ((stream << 1) | c) &&
 491                                     !cdev->first_packet) {
 492                                         if (!cdev->input_panic)
 493                                                 dev_warn(dev, " EXPECTED: %02x got %02x, c %d, stream %d, i %d\n",
 494                                                          ((stream << 1) | c), usb_buf[i], c, stream, i);
 495                                         cdev->input_panic = 1;
 496                                 }
 497
 498                                 i++;
 499                         }
 500                 }
 501         }
 502
 503         if (cdev->first_packet > 0)
 504                 cdev->first_packet--;
 505 }
 506
 507 static void read_in_urb(struct snd_usb_caiaqdev *cdev,
 508                         const struct urb *urb,
 509                         const struct usb_iso_packet_descriptor *iso)
 510 {
 511         struct device *dev = caiaqdev_to_dev(cdev);
 512
 513         if (!cdev->streaming)
 514                 return;
 515
 516         if (iso->actual_length < cdev->bpp)
 517                 return;
 518
 519         switch (cdev->spec.data_alignment) {
 520         case 0:
 521                 read_in_urb_mode0(cdev, urb, iso);
 522                 break;
 523         case 2:
 524                 read_in_urb_mode2(cdev, urb, iso);
 525                 break;
 526         case 3:
 527                 read_in_urb_mode3(cdev, urb, iso);
 528                 break;
 529         }
 530
 531         if ((cdev->input_panic || cdev->output_panic) && !cdev->warned) {
 532                 dev_warn(dev, "streaming error detected %s %s\n",
 533                                 cdev->input_panic ? "(input)" : "",
 534                                 cdev->output_panic ? "(output)" : "");
 535                 cdev->warned = 1;
 536         }
 537 }
 538
 539 static void fill_out_urb_mode_0(struct snd_usb_caiaqdev *cdev,
 540                                 struct urb *urb,
 541                                 const struct usb_iso_packet_descriptor *iso)
 542 {
 543         unsigned char *usb_buf = urb->transfer_buffer + iso->offset;
 544         struct snd_pcm_substream *sub;
 545         int stream, i;
 546
 547         for (i = 0; i < iso->length;) {
 548                 for (stream = 0; stream < cdev->n_streams; stream++, i++) {
 549                         sub = cdev->sub_playback[stream];
 550                         if (sub) {
 551                                 struct snd_pcm_runtime *rt = sub->runtime;
 552                                 char *audio_buf = rt->dma_area;
 553                                 int sz = frames_to_bytes(rt, rt->buffer_size);
 554                                 usb_buf[i] =
 555                                         audio_buf[cdev->audio_out_buf_pos[stream]];
 556                                 cdev->period_out_count[stream]++;
 557                                 cdev->audio_out_buf_pos[stream]++;
 558                                 if (cdev->audio_out_buf_pos[stream] == sz)
 559                                         cdev->audio_out_buf_pos[stream] = 0;
 560                         } else
 561                                 usb_buf[i] = 0;
 562                 }
 563
 564                 /* fill in the check bytes */
 565                 if (cdev->spec.data_alignment == 2 &&
 566                     i % (cdev->n_streams * BYTES_PER_SAMPLE_USB) ==
 567                         (cdev->n_streams * CHANNELS_PER_STREAM))
 568                         for (stream = 0; stream < cdev->n_streams; stream++, i++)
 569                                 usb_buf[i] = MAKE_CHECKBYTE(cdev, stream, i);
 570         }
 571 }
 572
 573 static void fill_out_urb_mode_3(struct snd_usb_caiaqdev *cdev,
 574                                 struct urb *urb,
 575                                 const struct usb_iso_packet_descriptor *iso)
 576 {
 577         unsigned char *usb_buf = urb->transfer_buffer + iso->offset;
 578         int stream, i;
 579
 580         for (i = 0; i < iso->length;) {
 581                 for (stream = 0; stream < cdev->n_streams; stream++) {
 582                         struct snd_pcm_substream *sub = cdev->sub_playback[stream];
 583                         char *audio_buf = NULL;
 584                         int c, n, sz = 0;
 585
 586                         if (sub) {
 587                                 struct snd_pcm_runtime *rt = sub->runtime;
 588                                 audio_buf = rt->dma_area;
 589                                 sz = frames_to_bytes(rt, rt->buffer_size);
 590                         }
 591
 592                         for (c = 0; c < CHANNELS_PER_STREAM; c++) {
 593                                 for (n = 0; n < BYTES_PER_SAMPLE; n++) {
 594                                         if (audio_buf) {
 595                                                 usb_buf[i+n] = audio_buf[cdev->audio_out_buf_pos[stream]++];
 596
 597                                                 if (cdev->audio_out_buf_pos[stream] == sz)
 598                                                         cdev->audio_out_buf_pos[stream] = 0;
 599                                         } else {
 600                                                 usb_buf[i+n] = 0;
 601                                         }
 602                                 }
 603
 604                                 if (audio_buf)
 605                                         cdev->period_out_count[stream] += BYTES_PER_SAMPLE;
 606
 607                                 i += BYTES_PER_SAMPLE;
 608
 609                                 /* fill in the check byte pattern */
 610                                 usb_buf[i++] = (stream << 1) | c;
 611                         }
 612                 }
 613         }
 614 }
 615
 616 static inline void fill_out_urb(struct snd_usb_caiaqdev *cdev,
 617                                 struct urb *urb,
 618                                 const struct usb_iso_packet_descriptor *iso)
 619 {
 620         switch (cdev->spec.data_alignment) {
 621         case 0:
 622         case 2:
 623                 fill_out_urb_mode_0(cdev, urb, iso);
 624                 break;
 625         case 3:
 626                 fill_out_urb_mode_3(cdev, urb, iso);
 627                 break;
 628         }
 629 }
 630
 631 static void read_completed(struct urb *urb)
 632 {
 633         struct snd_usb_caiaq_cb_info *info = urb->context;
 634         struct snd_usb_caiaqdev *cdev;
 635         struct device *dev;
 636         struct urb *out = NULL;
 637         int i, frame, len, send_it = 0, outframe = 0;
 638         unsigned long flags;
 639         size_t offset = 0;
 640
 641         if (urb->status || !info)
 642                 return;
 643
 644         cdev = info->cdev;
 645         dev = caiaqdev_to_dev(cdev);
 646
 647         if (!cdev->streaming)
 648                 return;
 649
 650         /* find an unused output urb that is unused */
 651         for (i = 0; i < N_URBS; i++)
 652                 if (test_and_set_bit(i, &cdev->outurb_active_mask) == 0) {
 653                         out = cdev->data_urbs_out[i];
 654                         break;
 655                 }
 656
 657         if (!out) {
 658                 dev_err(dev, "Unable to find an output urb to use\n");
 659                 goto requeue;
 660         }
 661
 662         /* read the recently received packet and send back one which has
 663          * the same layout */
 664         for (frame = 0; frame < FRAMES_PER_URB; frame++) {
 665                 if (urb->iso_frame_desc[frame].status)
 666                         continue;
 667
 668                 len = urb->iso_frame_desc[outframe].actual_length;
 669                 out->iso_frame_desc[outframe].length = len;
 670                 out->iso_frame_desc[outframe].actual_length = 0;
 671                 out->iso_frame_desc[outframe].offset = offset;
 672                 offset += len;
 673
 674                 if (len > 0) {
 675                         spin_lock_irqsave(&cdev->spinlock, flags);
 676                         fill_out_urb(cdev, out, &out->iso_frame_desc[outframe]);
 677                         read_in_urb(cdev, urb, &urb->iso_frame_desc[frame]);
 678                         spin_unlock_irqrestore(&cdev->spinlock, flags);
 679                         check_for_elapsed_periods(cdev, cdev->sub_playback);
 680                         check_for_elapsed_periods(cdev, cdev->sub_capture);
 681                         send_it = 1;
 682                 }
 683
 684                 outframe++;
 685         }
 686
 687         if (send_it) {
 688                 out->number_of_packets = outframe;
 689                 usb_submit_urb(out, GFP_ATOMIC);
 690         } else {
 691                 struct snd_usb_caiaq_cb_info *oinfo = out->context;
 692                 clear_bit(oinfo->index, &cdev->outurb_active_mask);
 693         }
 694
 695 requeue:
 696         /* re-submit inbound urb */
 697         for (frame = 0; frame < FRAMES_PER_URB; frame++) {
 698                 urb->iso_frame_desc[frame].offset = BYTES_PER_FRAME * frame;
 699                 urb->iso_frame_desc[frame].length = BYTES_PER_FRAME;
 700                 urb->iso_frame_desc[frame].actual_length = 0;
 701         }
 702
 703         urb->number_of_packets = FRAMES_PER_URB;
 704         usb_submit_urb(urb, GFP_ATOMIC);
 705 }
 706
 707 static void write_completed(struct urb *urb)
 708 {
 709         struct snd_usb_caiaq_cb_info *info = urb->context;
 710         struct snd_usb_caiaqdev *cdev = info->cdev;
 711
 712         if (!cdev->output_running) {
 713                 cdev->output_running = 1;
 714                 wake_up(&cdev->prepare_wait_queue);
 715         }
 716
 717         clear_bit(info->index, &cdev->outurb_active_mask);
 718 }
 719
 720 static struct urb **alloc_urbs(struct snd_usb_caiaqdev *cdev, int dir, int *ret)
 721 {
 722         int i, frame;
 723         struct urb **urbs;
 724         struct usb_device *usb_dev = cdev->chip.dev;
 725         unsigned int pipe;
 726
 727         pipe = (dir == SNDRV_PCM_STREAM_PLAYBACK) ?
 728                 usb_sndisocpipe(usb_dev, ENDPOINT_PLAYBACK) :
 729                 usb_rcvisocpipe(usb_dev, ENDPOINT_CAPTURE);
 730
 731         urbs = kmalloc_array(N_URBS, sizeof(*urbs), GFP_KERNEL);
 732         if (!urbs) {
 733                 *ret = -ENOMEM;
 734                 return NULL;
 735         }
 736
 737         for (i = 0; i < N_URBS; i++) {
 738                 urbs[i] = usb_alloc_urb(FRAMES_PER_URB, GFP_KERNEL);
 739                 if (!urbs[i]) {
 740                         *ret = -ENOMEM;
 741                         return urbs;
 742                 }
 743
 744                 urbs[i]->transfer_buffer =
 745                         kmalloc_array(BYTES_PER_FRAME, FRAMES_PER_URB,
 746                                       GFP_KERNEL);
 747                 if (!urbs[i]->transfer_buffer) {
 748                         *ret = -ENOMEM;
 749                         return urbs;
 750                 }
 751
 752                 for (frame = 0; frame < FRAMES_PER_URB; frame++) {
 753                         struct usb_iso_packet_descriptor *iso =
 754                                 &urbs[i]->iso_frame_desc[frame];
 755
 756                         iso->offset = BYTES_PER_FRAME * frame;
 757                         iso->length = BYTES_PER_FRAME;
 758                 }
 759
 760                 urbs[i]->dev = usb_dev;
 761                 urbs[i]->pipe = pipe;
 762                 urbs[i]->transfer_buffer_length = FRAMES_PER_URB
 763                                                 * BYTES_PER_FRAME;
 764                 urbs[i]->context = &cdev->data_cb_info[i];
 765                 urbs[i]->interval = 1;
 766                 urbs[i]->number_of_packets = FRAMES_PER_URB;
 767                 urbs[i]->complete = (dir == SNDRV_PCM_STREAM_CAPTURE) ?
 768                                         read_completed : write_completed;
 769         }
 770
 771         *ret = 0;
 772         return urbs;
 773 }
 774
 775 static void free_urbs(struct urb **urbs)
 776 {
 777         int i;
 778
 779         if (!urbs)
 780                 return;
 781
 782         for (i = 0; i < N_URBS; i++) {
 783                 if (!urbs[i])
 784                         continue;
 785
 786                 usb_kill_urb(urbs[i]);
 787                 kfree(urbs[i]->transfer_buffer);
 788                 usb_free_urb(urbs[i]);
 789         }
 790
 791         kfree(urbs);
 792 }
 793
 794 int snd_usb_caiaq_audio_init(struct snd_usb_caiaqdev *cdev)
 795 {
 796         int i, ret;
 797         struct device *dev = caiaqdev_to_dev(cdev);
 798
 799         cdev->n_audio_in  = max(cdev->spec.num_analog_audio_in,
 800                                cdev->spec.num_digital_audio_in) /
 801                                 CHANNELS_PER_STREAM;
 802         cdev->n_audio_out = max(cdev->spec.num_analog_audio_out,
 803                                cdev->spec.num_digital_audio_out) /
 804                                 CHANNELS_PER_STREAM;
 805         cdev->n_streams = max(cdev->n_audio_in, cdev->n_audio_out);
 806
 807         dev_dbg(dev, "cdev->n_audio_in = %d\n", cdev->n_audio_in);
 808         dev_dbg(dev, "cdev->n_audio_out = %d\n", cdev->n_audio_out);
 809         dev_dbg(dev, "cdev->n_streams = %d\n", cdev->n_streams);
 810
 811         if (cdev->n_streams > MAX_STREAMS) {
 812                 dev_err(dev, "unable to initialize device, too many streams.\n");
 813                 return -EINVAL;
 814         }
 815
 816         if (cdev->n_streams < 1) {
 817                 dev_err(dev, "bogus number of streams: %d\n", cdev->n_streams);
 818                 return -EINVAL;
 819         }
 820
 821         ret = snd_pcm_new(cdev->chip.card, cdev->product_name, 0,
 822                         cdev->n_audio_out, cdev->n_audio_in, &cdev->pcm);
 823
 824         if (ret < 0) {
 825                 dev_err(dev, "snd_pcm_new() returned %d\n", ret);
 826                 return ret;
 827         }
 828
 829         cdev->pcm->private_data = cdev;
 830         strlcpy(cdev->pcm->name, cdev->product_name, sizeof(cdev->pcm->name));
 831
 832         memset(cdev->sub_playback, 0, sizeof(cdev->sub_playback));
 833         memset(cdev->sub_capture, 0, sizeof(cdev->sub_capture));
 834
 835         memcpy(&cdev->pcm_info, &snd_usb_caiaq_pcm_hardware,
 836                         sizeof(snd_usb_caiaq_pcm_hardware));
 837
 838         /* setup samplerates */
 839         cdev->samplerates = cdev->pcm_info.rates;
 840         switch (cdev->chip.usb_id) {
 841         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_AK1):
 842         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_RIGKONTROL3):
 843         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_SESSIONIO):
 844         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_GUITARRIGMOBILE):
 845                 cdev->samplerates |= SNDRV_PCM_RATE_192000;
 846                 /* fall thru */
 847         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_AUDIO2DJ):
 848         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_AUDIO4DJ):
 849         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_AUDIO8DJ):
 850         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_TRAKTORAUDIO2):
 851                 cdev->samplerates |= SNDRV_PCM_RATE_88200;
 852                 break;
 853         }
 854
 855         snd_pcm_set_ops(cdev->pcm, SNDRV_PCM_STREAM_PLAYBACK,
 856                                 &snd_usb_caiaq_ops);
 857         snd_pcm_set_ops(cdev->pcm, SNDRV_PCM_STREAM_CAPTURE,
 858                                 &snd_usb_caiaq_ops);
 859
 860         cdev->data_cb_info =
 861                 kmalloc_array(N_URBS, sizeof(struct snd_usb_caiaq_cb_info),
 862                                         GFP_KERNEL);
 863
 864         if (!cdev->data_cb_info)
 865                 return -ENOMEM;
 866
 867         cdev->outurb_active_mask = 0;
 868         BUILD_BUG_ON(N_URBS > (sizeof(cdev->outurb_active_mask) * 8));
 869
 870         for (i = 0; i < N_URBS; i++) {
 871                 cdev->data_cb_info[i].cdev = cdev;
 872                 cdev->data_cb_info[i].index = i;
 873         }
 874
 875         cdev->data_urbs_in = alloc_urbs(cdev, SNDRV_PCM_STREAM_CAPTURE, &ret);
 876         if (ret < 0) {
 877                 kfree(cdev->data_cb_info);
 878                 free_urbs(cdev->data_urbs_in);
 879                 return ret;
 880         }
 881
 882         cdev->data_urbs_out = alloc_urbs(cdev, SNDRV_PCM_STREAM_PLAYBACK, &ret);
 883         if (ret < 0) {
 884                 kfree(cdev->data_cb_info);
 885                 free_urbs(cdev->data_urbs_in);
 886                 free_urbs(cdev->data_urbs_out);
 887                 return ret;
 888         }
 889
 890         return 0;
 891 }
 892
 893 void snd_usb_caiaq_audio_free(struct snd_usb_caiaqdev *cdev)
 894 {
 895         struct device *dev = caiaqdev_to_dev(cdev);
 896
 897         dev_dbg(dev, "%s(%p)\n", __func__, cdev);
 898         stream_stop(cdev);
 899         free_urbs(cdev->data_urbs_in);
 900         free_urbs(cdev->data_urbs_out);
 901         kfree(cdev->data_cb_info);
 902 }
 903