sound/usb/caiaq/audio.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *   Copyright (c) 2006-2008 Daniel Mack, Karsten Wiese
   4 */
   5
   6 #include <linux/device.h>
   7 #include <linux/spinlock.h>
   8 #include <linux/slab.h>
   9 #include <linux/init.h>
  10 #include <linux/usb.h>
  11 #include <sound/core.h>
  12 #include <sound/pcm.h>
  13
  14 #include "device.h"
  15 #include "audio.h"
  16
  17 #define N_URBS                  32
  18 #define CLOCK_DRIFT_TOLERANCE   5
  19 #define FRAMES_PER_URB          8
  20 #define BYTES_PER_FRAME         512
  21 #define CHANNELS_PER_STREAM     2
  22 #define BYTES_PER_SAMPLE        3
  23 #define BYTES_PER_SAMPLE_USB    4
  24 #define MAX_BUFFER_SIZE         (128*1024)
  25 #define MAX_ENDPOINT_SIZE       512
  26
  27 #define ENDPOINT_CAPTURE        2
  28 #define ENDPOINT_PLAYBACK       6
  29
  30 #define MAKE_CHECKBYTE(cdev,stream,i) \
  31         (stream << 1) | (~(i / (cdev->n_streams * BYTES_PER_SAMPLE_USB)) & 1)
  32
  33 static struct snd_pcm_hardware snd_usb_caiaq_pcm_hardware = {
  34         .info           = (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
  35                            SNDRV_PCM_INFO_BLOCK_TRANSFER),
  36         .formats        = SNDRV_PCM_FMTBIT_S24_3BE,
  37         .rates          = (SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 |
  38                            SNDRV_PCM_RATE_96000),
  39         .rate_min       = 44100,
  40         .rate_max       = 0, /* will overwrite later */
  41         .channels_min   = CHANNELS_PER_STREAM,
  42         .channels_max   = CHANNELS_PER_STREAM,
  43         .buffer_bytes_max = MAX_BUFFER_SIZE,
  44         .period_bytes_min = 128,
  45         .period_bytes_max = MAX_BUFFER_SIZE,
  46         .periods_min    = 1,
  47         .periods_max    = 1024,
  48 };
  49
  50 static void
  51 activate_substream(struct snd_usb_caiaqdev *cdev,
  52                    struct snd_pcm_substream *sub)
  53 {
  54         spin_lock(&cdev->spinlock);
  55
  56         if (sub->stream == SNDRV_PCM_STREAM_PLAYBACK)
  57                 cdev->sub_playback[sub->number] = sub;
  58         else
  59                 cdev->sub_capture[sub->number] = sub;
  60
  61         spin_unlock(&cdev->spinlock);
  62 }
  63
  64 static void
  65 deactivate_substream(struct snd_usb_caiaqdev *cdev,
  66                      struct snd_pcm_substream *sub)
  67 {
  68         unsigned long flags;
  69         spin_lock_irqsave(&cdev->spinlock, flags);
  70
  71         if (sub->stream == SNDRV_PCM_STREAM_PLAYBACK)
  72                 cdev->sub_playback[sub->number] = NULL;
  73         else
  74                 cdev->sub_capture[sub->number] = NULL;
  75
  76         spin_unlock_irqrestore(&cdev->spinlock, flags);
  77 }
  78
  79 static int
  80 all_substreams_zero(struct snd_pcm_substream **subs)
  81 {
  82         int i;
  83         for (i = 0; i < MAX_STREAMS; i++)
  84                 if (subs[i] != NULL)
  85                         return 0;
  86         return 1;
  87 }
  88
  89 static int stream_start(struct snd_usb_caiaqdev *cdev)
  90 {
  91         int i, ret;
  92         struct device *dev = caiaqdev_to_dev(cdev);
  93
  94         dev_dbg(dev, "%s(%p)\n", __func__, cdev);
  95
  96         if (cdev->streaming)
  97                 return -EINVAL;
  98
  99         memset(cdev->sub_playback, 0, sizeof(cdev->sub_playback));
 100         memset(cdev->sub_capture, 0, sizeof(cdev->sub_capture));
 101         cdev->input_panic = 0;
 102         cdev->output_panic = 0;
 103         cdev->first_packet = 4;
 104         cdev->streaming = 1;
 105         cdev->warned = 0;
 106
 107         for (i = 0; i < N_URBS; i++) {
 108                 ret = usb_submit_urb(cdev->data_urbs_in[i], GFP_ATOMIC);
 109                 if (ret) {
 110                         dev_err(dev, "unable to trigger read #%d! (ret %d)\n",
 111                                 i, ret);
 112                         cdev->streaming = 0;
 113                         return -EPIPE;
 114                 }
 115         }
 116
 117         return 0;
 118 }
 119
 120 static void stream_stop(struct snd_usb_caiaqdev *cdev)
 121 {
 122         int i;
 123         struct device *dev = caiaqdev_to_dev(cdev);
 124
 125         dev_dbg(dev, "%s(%p)\n", __func__, cdev);
 126         if (!cdev->streaming)
 127                 return;
 128
 129         cdev->streaming = 0;
 130
 131         for (i = 0; i < N_URBS; i++) {
 132                 usb_kill_urb(cdev->data_urbs_in[i]);
 133
 134                 if (test_bit(i, &cdev->outurb_active_mask))
 135                         usb_kill_urb(cdev->data_urbs_out[i]);
 136         }
 137
 138         cdev->outurb_active_mask = 0;
 139 }
 140
 141 static int snd_usb_caiaq_substream_open(struct snd_pcm_substream *substream)
 142 {
 143         struct snd_usb_caiaqdev *cdev = snd_pcm_substream_chip(substream);
 144         struct device *dev = caiaqdev_to_dev(cdev);
 145
 146         dev_dbg(dev, "%s(%p)\n", __func__, substream);
 147         substream->runtime->hw = cdev->pcm_info;
 148         snd_pcm_limit_hw_rates(substream->runtime);
 149
 150         return 0;
 151 }
 152
 153 static int snd_usb_caiaq_substream_close(struct snd_pcm_substream *substream)
 154 {
 155         struct snd_usb_caiaqdev *cdev = snd_pcm_substream_chip(substream);
 156         struct device *dev = caiaqdev_to_dev(cdev);
 157
 158         dev_dbg(dev, "%s(%p)\n", __func__, substream);
 159         if (all_substreams_zero(cdev->sub_playback) &&
 160             all_substreams_zero(cdev->sub_capture)) {
 161                 /* when the last client has stopped streaming,
 162                  * all sample rates are allowed again */
 163                 stream_stop(cdev);
 164                 cdev->pcm_info.rates = cdev->samplerates;
 165         }
 166
 167         return 0;
 168 }
 169
 170 static int snd_usb_caiaq_pcm_hw_params(struct snd_pcm_substream *sub,
 171                                        struct snd_pcm_hw_params *hw_params)
 172 {
 173         return snd_pcm_lib_alloc_vmalloc_buffer(sub,
 174                                                 params_buffer_bytes(hw_params));
 175 }
 176
 177 static int snd_usb_caiaq_pcm_hw_free(struct snd_pcm_substream *sub)
 178 {
 179         struct snd_usb_caiaqdev *cdev = snd_pcm_substream_chip(sub);
 180         deactivate_substream(cdev, sub);
 181         return snd_pcm_lib_free_vmalloc_buffer(sub);
 182 }
 183
 184 /* this should probably go upstream */
 185 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
 186 #error "Change this table"
 187 #endif
 188
 189 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
 190                                 48000, 64000, 88200, 96000, 176400, 192000 };
 191
 192 static int snd_usb_caiaq_pcm_prepare(struct snd_pcm_substream *substream)
 193 {
 194         int bytes_per_sample, bpp, ret, i;
 195         int index = substream->number;
 196         struct snd_usb_caiaqdev *cdev = snd_pcm_substream_chip(substream);
 197         struct snd_pcm_runtime *runtime = substream->runtime;
 198         struct device *dev = caiaqdev_to_dev(cdev);
 199
 200         dev_dbg(dev, "%s(%p)\n", __func__, substream);
 201
 202         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 203                 int out_pos;
 204
 205                 switch (cdev->spec.data_alignment) {
 206                 case 0:
 207                 case 2:
 208                         out_pos = BYTES_PER_SAMPLE + 1;
 209                         break;
 210                 case 3:
 211                 default:
 212                         out_pos = 0;
 213                         break;
 214                 }
 215
 216                 cdev->period_out_count[index] = out_pos;
 217                 cdev->audio_out_buf_pos[index] = out_pos;
 218         } else {
 219                 int in_pos;
 220
 221                 switch (cdev->spec.data_alignment) {
 222                 case 0:
 223                         in_pos = BYTES_PER_SAMPLE + 2;
 224                         break;
 225                 case 2:
 226                         in_pos = BYTES_PER_SAMPLE;
 227                         break;
 228                 case 3:
 229                 default:
 230                         in_pos = 0;
 231                         break;
 232                 }
 233
 234                 cdev->period_in_count[index] = in_pos;
 235                 cdev->audio_in_buf_pos[index] = in_pos;
 236         }
 237
 238         if (cdev->streaming)
 239                 return 0;
 240
 241         /* the first client that opens a stream defines the sample rate
 242          * setting for all subsequent calls, until the last client closed. */
 243         for (i=0; i < ARRAY_SIZE(rates); i++)
 244                 if (runtime->rate == rates[i])
 245                         cdev->pcm_info.rates = 1 << i;
 246
 247         snd_pcm_limit_hw_rates(runtime);
 248
 249         bytes_per_sample = BYTES_PER_SAMPLE;
 250         if (cdev->spec.data_alignment >= 2)
 251                 bytes_per_sample++;
 252
 253         bpp = ((runtime->rate / 8000) + CLOCK_DRIFT_TOLERANCE)
 254                 * bytes_per_sample * CHANNELS_PER_STREAM * cdev->n_streams;
 255
 256         if (bpp > MAX_ENDPOINT_SIZE)
 257                 bpp = MAX_ENDPOINT_SIZE;
 258
 259         ret = snd_usb_caiaq_set_audio_params(cdev, runtime->rate,
 260                                              runtime->sample_bits, bpp);
 261         if (ret)
 262                 return ret;
 263
 264         ret = stream_start(cdev);
 265         if (ret)
 266                 return ret;
 267
 268         cdev->output_running = 0;
 269         wait_event_timeout(cdev->prepare_wait_queue, cdev->output_running, HZ);
 270         if (!cdev->output_running) {
 271                 stream_stop(cdev);
 272                 return -EPIPE;
 273         }
 274
 275         return 0;
 276 }
 277
 278 static int snd_usb_caiaq_pcm_trigger(struct snd_pcm_substream *sub, int cmd)
 279 {
 280         struct snd_usb_caiaqdev *cdev = snd_pcm_substream_chip(sub);
 281         struct device *dev = caiaqdev_to_dev(cdev);
 282
 283         dev_dbg(dev, "%s(%p) cmd %d\n", __func__, sub, cmd);
 284
 285         switch (cmd) {
 286         case SNDRV_PCM_TRIGGER_START:
 287         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 288                 activate_substream(cdev, sub);
 289                 break;
 290         case SNDRV_PCM_TRIGGER_STOP:
 291         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 292                 deactivate_substream(cdev, sub);
 293                 break;
 294         default:
 295                 return -EINVAL;
 296         }
 297
 298         return 0;
 299 }
 300
 301 static snd_pcm_uframes_t
 302 snd_usb_caiaq_pcm_pointer(struct snd_pcm_substream *sub)
 303 {
 304         int index = sub->number;
 305         struct snd_usb_caiaqdev *cdev = snd_pcm_substream_chip(sub);
 306         snd_pcm_uframes_t ptr;
 307
 308         spin_lock(&cdev->spinlock);
 309
 310         if (cdev->input_panic || cdev->output_panic) {
 311                 ptr = SNDRV_PCM_POS_XRUN;
 312                 goto unlock;
 313         }
 314
 315         if (sub->stream == SNDRV_PCM_STREAM_PLAYBACK)
 316                 ptr = bytes_to_frames(sub->runtime,
 317                                         cdev->audio_out_buf_pos[index]);
 318         else
 319                 ptr = bytes_to_frames(sub->runtime,
 320                                         cdev->audio_in_buf_pos[index]);
 321
 322 unlock:
 323         spin_unlock(&cdev->spinlock);
 324         return ptr;
 325 }
 326
 327 /* operators for both playback and capture */
 328 static const struct snd_pcm_ops snd_usb_caiaq_ops = {
 329         .open =         snd_usb_caiaq_substream_open,
 330         .close =        snd_usb_caiaq_substream_close,
 331         .ioctl =        snd_pcm_lib_ioctl,
 332         .hw_params =    snd_usb_caiaq_pcm_hw_params,
 333         .hw_free =      snd_usb_caiaq_pcm_hw_free,
 334         .prepare =      snd_usb_caiaq_pcm_prepare,
 335         .trigger =      snd_usb_caiaq_pcm_trigger,
 336         .pointer =      snd_usb_caiaq_pcm_pointer,
 337         .page =         snd_pcm_lib_get_vmalloc_page,
 338 };
 339
 340 static void check_for_elapsed_periods(struct snd_usb_caiaqdev *cdev,
 341                                       struct snd_pcm_substream **subs)
 342 {
 343         int stream, pb, *cnt;
 344         struct snd_pcm_substream *sub;
 345
 346         for (stream = 0; stream < cdev->n_streams; stream++) {
 347                 sub = subs[stream];
 348                 if (!sub)
 349                         continue;
 350
 351                 pb = snd_pcm_lib_period_bytes(sub);
 352                 cnt = (sub->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
 353                                         &cdev->period_out_count[stream] :
 354                                         &cdev->period_in_count[stream];
 355
 356                 if (*cnt >= pb) {
 357                         snd_pcm_period_elapsed(sub);
 358                         *cnt %= pb;
 359                 }
 360         }
 361 }
 362
 363 static void read_in_urb_mode0(struct snd_usb_caiaqdev *cdev,
 364                               const struct urb *urb,
 365                               const struct usb_iso_packet_descriptor *iso)
 366 {
 367         unsigned char *usb_buf = urb->transfer_buffer + iso->offset;
 368         struct snd_pcm_substream *sub;
 369         int stream, i;
 370
 371         if (all_substreams_zero(cdev->sub_capture))
 372                 return;
 373
 374         for (i = 0; i < iso->actual_length;) {
 375                 for (stream = 0; stream < cdev->n_streams; stream++, i++) {
 376                         sub = cdev->sub_capture[stream];
 377                         if (sub) {
 378                                 struct snd_pcm_runtime *rt = sub->runtime;
 379                                 char *audio_buf = rt->dma_area;
 380                                 int sz = frames_to_bytes(rt, rt->buffer_size);
 381                                 audio_buf[cdev->audio_in_buf_pos[stream]++]
 382                                         = usb_buf[i];
 383                                 cdev->period_in_count[stream]++;
 384                                 if (cdev->audio_in_buf_pos[stream] == sz)
 385                                         cdev->audio_in_buf_pos[stream] = 0;
 386                         }
 387                 }
 388         }
 389 }
 390
 391 static void read_in_urb_mode2(struct snd_usb_caiaqdev *cdev,
 392                               const struct urb *urb,
 393                               const struct usb_iso_packet_descriptor *iso)
 394 {
 395         unsigned char *usb_buf = urb->transfer_buffer + iso->offset;
 396         unsigned char check_byte;
 397         struct snd_pcm_substream *sub;
 398         int stream, i;
 399
 400         for (i = 0; i < iso->actual_length;) {
 401                 if (i % (cdev->n_streams * BYTES_PER_SAMPLE_USB) == 0) {
 402                         for (stream = 0;
 403                              stream < cdev->n_streams;
 404                              stream++, i++) {
 405                                 if (cdev->first_packet)
 406                                         continue;
 407
 408                                 check_byte = MAKE_CHECKBYTE(cdev, stream, i);
 409
 410                                 if ((usb_buf[i] & 0x3f) != check_byte)
 411                                         cdev->input_panic = 1;
 412
 413                                 if (usb_buf[i] & 0x80)
 414                                         cdev->output_panic = 1;
 415                         }
 416                 }
 417                 cdev->first_packet = 0;
 418
 419                 for (stream = 0; stream < cdev->n_streams; stream++, i++) {
 420                         sub = cdev->sub_capture[stream];
 421                         if (cdev->input_panic)
 422                                 usb_buf[i] = 0;
 423
 424                         if (sub) {
 425                                 struct snd_pcm_runtime *rt = sub->runtime;
 426                                 char *audio_buf = rt->dma_area;
 427                                 int sz = frames_to_bytes(rt, rt->buffer_size);
 428                                 audio_buf[cdev->audio_in_buf_pos[stream]++] =
 429                                         usb_buf[i];
 430                                 cdev->period_in_count[stream]++;
 431                                 if (cdev->audio_in_buf_pos[stream] == sz)
 432                                         cdev->audio_in_buf_pos[stream] = 0;
 433                         }
 434                 }
 435         }
 436 }
 437
 438 static void read_in_urb_mode3(struct snd_usb_caiaqdev *cdev,
 439                               const struct urb *urb,
 440                               const struct usb_iso_packet_descriptor *iso)
 441 {
 442         unsigned char *usb_buf = urb->transfer_buffer + iso->offset;
 443         struct device *dev = caiaqdev_to_dev(cdev);
 444         int stream, i;
 445
 446         /* paranoia check */
 447         if (iso->actual_length % (BYTES_PER_SAMPLE_USB * CHANNELS_PER_STREAM))
 448                 return;
 449
 450         for (i = 0; i < iso->actual_length;) {
 451                 for (stream = 0; stream < cdev->n_streams; stream++) {
 452                         struct snd_pcm_substream *sub = cdev->sub_capture[stream];
 453                         char *audio_buf = NULL;
 454                         int c, n, sz = 0;
 455
 456                         if (sub && !cdev->input_panic) {
 457                                 struct snd_pcm_runtime *rt = sub->runtime;
 458                                 audio_buf = rt->dma_area;
 459                                 sz = frames_to_bytes(rt, rt->buffer_size);
 460                         }
 461
 462                         for (c = 0; c < CHANNELS_PER_STREAM; c++) {
 463                                 /* 3 audio data bytes, followed by 1 check byte */
 464                                 if (audio_buf) {
 465                                         for (n = 0; n < BYTES_PER_SAMPLE; n++) {
 466                                                 audio_buf[cdev->audio_in_buf_pos[stream]++] = usb_buf[i+n];
 467
 468                                                 if (cdev->audio_in_buf_pos[stream] == sz)
 469                                                         cdev->audio_in_buf_pos[stream] = 0;
 470                                         }
 471
 472                                         cdev->period_in_count[stream] += BYTES_PER_SAMPLE;
 473                                 }
 474
 475                                 i += BYTES_PER_SAMPLE;
 476
 477                                 if (usb_buf[i] != ((stream << 1) | c) &&
 478                                     !cdev->first_packet) {
 479                                         if (!cdev->input_panic)
 480                                                 dev_warn(dev, " EXPECTED: %02x got %02x, c %d, stream %d, i %d\n",
 481                                                          ((stream << 1) | c), usb_buf[i], c, stream, i);
 482                                         cdev->input_panic = 1;
 483                                 }
 484
 485                                 i++;
 486                         }
 487                 }
 488         }
 489
 490         if (cdev->first_packet > 0)
 491                 cdev->first_packet--;
 492 }
 493
 494 static void read_in_urb(struct snd_usb_caiaqdev *cdev,
 495                         const struct urb *urb,
 496                         const struct usb_iso_packet_descriptor *iso)
 497 {
 498         struct device *dev = caiaqdev_to_dev(cdev);
 499
 500         if (!cdev->streaming)
 501                 return;
 502
 503         if (iso->actual_length < cdev->bpp)
 504                 return;
 505
 506         switch (cdev->spec.data_alignment) {
 507         case 0:
 508                 read_in_urb_mode0(cdev, urb, iso);
 509                 break;
 510         case 2:
 511                 read_in_urb_mode2(cdev, urb, iso);
 512                 break;
 513         case 3:
 514                 read_in_urb_mode3(cdev, urb, iso);
 515                 break;
 516         }
 517
 518         if ((cdev->input_panic || cdev->output_panic) && !cdev->warned) {
 519                 dev_warn(dev, "streaming error detected %s %s\n",
 520                                 cdev->input_panic ? "(input)" : "",
 521                                 cdev->output_panic ? "(output)" : "");
 522                 cdev->warned = 1;
 523         }
 524 }
 525
 526 static void fill_out_urb_mode_0(struct snd_usb_caiaqdev *cdev,
 527                                 struct urb *urb,
 528                                 const struct usb_iso_packet_descriptor *iso)
 529 {
 530         unsigned char *usb_buf = urb->transfer_buffer + iso->offset;
 531         struct snd_pcm_substream *sub;
 532         int stream, i;
 533
 534         for (i = 0; i < iso->length;) {
 535                 for (stream = 0; stream < cdev->n_streams; stream++, i++) {
 536                         sub = cdev->sub_playback[stream];
 537                         if (sub) {
 538                                 struct snd_pcm_runtime *rt = sub->runtime;
 539                                 char *audio_buf = rt->dma_area;
 540                                 int sz = frames_to_bytes(rt, rt->buffer_size);
 541                                 usb_buf[i] =
 542                                         audio_buf[cdev->audio_out_buf_pos[stream]];
 543                                 cdev->period_out_count[stream]++;
 544                                 cdev->audio_out_buf_pos[stream]++;
 545                                 if (cdev->audio_out_buf_pos[stream] == sz)
 546                                         cdev->audio_out_buf_pos[stream] = 0;
 547                         } else
 548                                 usb_buf[i] = 0;
 549                 }
 550
 551                 /* fill in the check bytes */
 552                 if (cdev->spec.data_alignment == 2 &&
 553                     i % (cdev->n_streams * BYTES_PER_SAMPLE_USB) ==
 554                         (cdev->n_streams * CHANNELS_PER_STREAM))
 555                         for (stream = 0; stream < cdev->n_streams; stream++, i++)
 556                                 usb_buf[i] = MAKE_CHECKBYTE(cdev, stream, i);
 557         }
 558 }
 559
 560 static void fill_out_urb_mode_3(struct snd_usb_caiaqdev *cdev,
 561                                 struct urb *urb,
 562                                 const struct usb_iso_packet_descriptor *iso)
 563 {
 564         unsigned char *usb_buf = urb->transfer_buffer + iso->offset;
 565         int stream, i;
 566
 567         for (i = 0; i < iso->length;) {
 568                 for (stream = 0; stream < cdev->n_streams; stream++) {
 569                         struct snd_pcm_substream *sub = cdev->sub_playback[stream];
 570                         char *audio_buf = NULL;
 571                         int c, n, sz = 0;
 572
 573                         if (sub) {
 574                                 struct snd_pcm_runtime *rt = sub->runtime;
 575                                 audio_buf = rt->dma_area;
 576                                 sz = frames_to_bytes(rt, rt->buffer_size);
 577                         }
 578
 579                         for (c = 0; c < CHANNELS_PER_STREAM; c++) {
 580                                 for (n = 0; n < BYTES_PER_SAMPLE; n++) {
 581                                         if (audio_buf) {
 582                                                 usb_buf[i+n] = audio_buf[cdev->audio_out_buf_pos[stream]++];
 583
 584                                                 if (cdev->audio_out_buf_pos[stream] == sz)
 585                                                         cdev->audio_out_buf_pos[stream] = 0;
 586                                         } else {
 587                                                 usb_buf[i+n] = 0;
 588                                         }
 589                                 }
 590
 591                                 if (audio_buf)
 592                                         cdev->period_out_count[stream] += BYTES_PER_SAMPLE;
 593
 594                                 i += BYTES_PER_SAMPLE;
 595
 596                                 /* fill in the check byte pattern */
 597                                 usb_buf[i++] = (stream << 1) | c;
 598                         }
 599                 }
 600         }
 601 }
 602
 603 static inline void fill_out_urb(struct snd_usb_caiaqdev *cdev,
 604                                 struct urb *urb,
 605                                 const struct usb_iso_packet_descriptor *iso)
 606 {
 607         switch (cdev->spec.data_alignment) {
 608         case 0:
 609         case 2:
 610                 fill_out_urb_mode_0(cdev, urb, iso);
 611                 break;
 612         case 3:
 613                 fill_out_urb_mode_3(cdev, urb, iso);
 614                 break;
 615         }
 616 }
 617
 618 static void read_completed(struct urb *urb)
 619 {
 620         struct snd_usb_caiaq_cb_info *info = urb->context;
 621         struct snd_usb_caiaqdev *cdev;
 622         struct device *dev;
 623         struct urb *out = NULL;
 624         int i, frame, len, send_it = 0, outframe = 0;
 625         unsigned long flags;
 626         size_t offset = 0;
 627
 628         if (urb->status || !info)
 629                 return;
 630
 631         cdev = info->cdev;
 632         dev = caiaqdev_to_dev(cdev);
 633
 634         if (!cdev->streaming)
 635                 return;
 636
 637         /* find an unused output urb that is unused */
 638         for (i = 0; i < N_URBS; i++)
 639                 if (test_and_set_bit(i, &cdev->outurb_active_mask) == 0) {
 640                         out = cdev->data_urbs_out[i];
 641                         break;
 642                 }
 643
 644         if (!out) {
 645                 dev_err(dev, "Unable to find an output urb to use\n");
 646                 goto requeue;
 647         }
 648
 649         /* read the recently received packet and send back one which has
 650          * the same layout */
 651         for (frame = 0; frame < FRAMES_PER_URB; frame++) {
 652                 if (urb->iso_frame_desc[frame].status)
 653                         continue;
 654
 655                 len = urb->iso_frame_desc[outframe].actual_length;
 656                 out->iso_frame_desc[outframe].length = len;
 657                 out->iso_frame_desc[outframe].actual_length = 0;
 658                 out->iso_frame_desc[outframe].offset = offset;
 659                 offset += len;
 660
 661                 if (len > 0) {
 662                         spin_lock_irqsave(&cdev->spinlock, flags);
 663                         fill_out_urb(cdev, out, &out->iso_frame_desc[outframe]);
 664                         read_in_urb(cdev, urb, &urb->iso_frame_desc[frame]);
 665                         spin_unlock_irqrestore(&cdev->spinlock, flags);
 666                         check_for_elapsed_periods(cdev, cdev->sub_playback);
 667                         check_for_elapsed_periods(cdev, cdev->sub_capture);
 668                         send_it = 1;
 669                 }
 670
 671                 outframe++;
 672         }
 673
 674         if (send_it) {
 675                 out->number_of_packets = outframe;
 676                 usb_submit_urb(out, GFP_ATOMIC);
 677         } else {
 678                 struct snd_usb_caiaq_cb_info *oinfo = out->context;
 679                 clear_bit(oinfo->index, &cdev->outurb_active_mask);
 680         }
 681
 682 requeue:
 683         /* re-submit inbound urb */
 684         for (frame = 0; frame < FRAMES_PER_URB; frame++) {
 685                 urb->iso_frame_desc[frame].offset = BYTES_PER_FRAME * frame;
 686                 urb->iso_frame_desc[frame].length = BYTES_PER_FRAME;
 687                 urb->iso_frame_desc[frame].actual_length = 0;
 688         }
 689
 690         urb->number_of_packets = FRAMES_PER_URB;
 691         usb_submit_urb(urb, GFP_ATOMIC);
 692 }
 693
 694 static void write_completed(struct urb *urb)
 695 {
 696         struct snd_usb_caiaq_cb_info *info = urb->context;
 697         struct snd_usb_caiaqdev *cdev = info->cdev;
 698
 699         if (!cdev->output_running) {
 700                 cdev->output_running = 1;
 701                 wake_up(&cdev->prepare_wait_queue);
 702         }
 703
 704         clear_bit(info->index, &cdev->outurb_active_mask);
 705 }
 706
 707 static struct urb **alloc_urbs(struct snd_usb_caiaqdev *cdev, int dir, int *ret)
 708 {
 709         int i, frame;
 710         struct urb **urbs;
 711         struct usb_device *usb_dev = cdev->chip.dev;
 712         unsigned int pipe;
 713
 714         pipe = (dir == SNDRV_PCM_STREAM_PLAYBACK) ?
 715                 usb_sndisocpipe(usb_dev, ENDPOINT_PLAYBACK) :
 716                 usb_rcvisocpipe(usb_dev, ENDPOINT_CAPTURE);
 717
 718         urbs = kmalloc_array(N_URBS, sizeof(*urbs), GFP_KERNEL);
 719         if (!urbs) {
 720                 *ret = -ENOMEM;
 721                 return NULL;
 722         }
 723
 724         for (i = 0; i < N_URBS; i++) {
 725                 urbs[i] = usb_alloc_urb(FRAMES_PER_URB, GFP_KERNEL);
 726                 if (!urbs[i]) {
 727                         *ret = -ENOMEM;
 728                         return urbs;
 729                 }
 730
 731                 urbs[i]->transfer_buffer =
 732                         kmalloc_array(BYTES_PER_FRAME, FRAMES_PER_URB,
 733                                       GFP_KERNEL);
 734                 if (!urbs[i]->transfer_buffer) {
 735                         *ret = -ENOMEM;
 736                         return urbs;
 737                 }
 738
 739                 for (frame = 0; frame < FRAMES_PER_URB; frame++) {
 740                         struct usb_iso_packet_descriptor *iso =
 741                                 &urbs[i]->iso_frame_desc[frame];
 742
 743                         iso->offset = BYTES_PER_FRAME * frame;
 744                         iso->length = BYTES_PER_FRAME;
 745                 }
 746
 747                 urbs[i]->dev = usb_dev;
 748                 urbs[i]->pipe = pipe;
 749                 urbs[i]->transfer_buffer_length = FRAMES_PER_URB
 750                                                 * BYTES_PER_FRAME;
 751                 urbs[i]->context = &cdev->data_cb_info[i];
 752                 urbs[i]->interval = 1;
 753                 urbs[i]->number_of_packets = FRAMES_PER_URB;
 754                 urbs[i]->complete = (dir == SNDRV_PCM_STREAM_CAPTURE) ?
 755                                         read_completed : write_completed;
 756         }
 757
 758         *ret = 0;
 759         return urbs;
 760 }
 761
 762 static void free_urbs(struct urb **urbs)
 763 {
 764         int i;
 765
 766         if (!urbs)
 767                 return;
 768
 769         for (i = 0; i < N_URBS; i++) {
 770                 if (!urbs[i])
 771                         continue;
 772
 773                 usb_kill_urb(urbs[i]);
 774                 kfree(urbs[i]->transfer_buffer);
 775                 usb_free_urb(urbs[i]);
 776         }
 777
 778         kfree(urbs);
 779 }
 780
 781 int snd_usb_caiaq_audio_init(struct snd_usb_caiaqdev *cdev)
 782 {
 783         int i, ret;
 784         struct device *dev = caiaqdev_to_dev(cdev);
 785
 786         cdev->n_audio_in  = max(cdev->spec.num_analog_audio_in,
 787                                cdev->spec.num_digital_audio_in) /
 788                                 CHANNELS_PER_STREAM;
 789         cdev->n_audio_out = max(cdev->spec.num_analog_audio_out,
 790                                cdev->spec.num_digital_audio_out) /
 791                                 CHANNELS_PER_STREAM;
 792         cdev->n_streams = max(cdev->n_audio_in, cdev->n_audio_out);
 793
 794         dev_dbg(dev, "cdev->n_audio_in = %d\n", cdev->n_audio_in);
 795         dev_dbg(dev, "cdev->n_audio_out = %d\n", cdev->n_audio_out);
 796         dev_dbg(dev, "cdev->n_streams = %d\n", cdev->n_streams);
 797
 798         if (cdev->n_streams > MAX_STREAMS) {
 799                 dev_err(dev, "unable to initialize device, too many streams.\n");
 800                 return -EINVAL;
 801         }
 802
 803         if (cdev->n_streams < 1) {
 804                 dev_err(dev, "bogus number of streams: %d\n", cdev->n_streams);
 805                 return -EINVAL;
 806         }
 807
 808         ret = snd_pcm_new(cdev->chip.card, cdev->product_name, 0,
 809                         cdev->n_audio_out, cdev->n_audio_in, &cdev->pcm);
 810
 811         if (ret < 0) {
 812                 dev_err(dev, "snd_pcm_new() returned %d\n", ret);
 813                 return ret;
 814         }
 815
 816         cdev->pcm->private_data = cdev;
 817         strlcpy(cdev->pcm->name, cdev->product_name, sizeof(cdev->pcm->name));
 818
 819         memset(cdev->sub_playback, 0, sizeof(cdev->sub_playback));
 820         memset(cdev->sub_capture, 0, sizeof(cdev->sub_capture));
 821
 822         memcpy(&cdev->pcm_info, &snd_usb_caiaq_pcm_hardware,
 823                         sizeof(snd_usb_caiaq_pcm_hardware));
 824
 825         /* setup samplerates */
 826         cdev->samplerates = cdev->pcm_info.rates;
 827         switch (cdev->chip.usb_id) {
 828         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_AK1):
 829         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_RIGKONTROL3):
 830         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_SESSIONIO):
 831         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_GUITARRIGMOBILE):
 832                 cdev->samplerates |= SNDRV_PCM_RATE_192000;
 833                 /* fall thru */
 834         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_AUDIO2DJ):
 835         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_AUDIO4DJ):
 836         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_AUDIO8DJ):
 837         case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_TRAKTORAUDIO2):
 838                 cdev->samplerates |= SNDRV_PCM_RATE_88200;
 839                 break;
 840         }
 841
 842         snd_pcm_set_ops(cdev->pcm, SNDRV_PCM_STREAM_PLAYBACK,
 843                                 &snd_usb_caiaq_ops);
 844         snd_pcm_set_ops(cdev->pcm, SNDRV_PCM_STREAM_CAPTURE,
 845                                 &snd_usb_caiaq_ops);
 846
 847         cdev->data_cb_info =
 848                 kmalloc_array(N_URBS, sizeof(struct snd_usb_caiaq_cb_info),
 849                                         GFP_KERNEL);
 850
 851         if (!cdev->data_cb_info)
 852                 return -ENOMEM;
 853
 854         cdev->outurb_active_mask = 0;
 855         BUILD_BUG_ON(N_URBS > (sizeof(cdev->outurb_active_mask) * 8));
 856
 857         for (i = 0; i < N_URBS; i++) {
 858                 cdev->data_cb_info[i].cdev = cdev;
 859                 cdev->data_cb_info[i].index = i;
 860         }
 861
 862         cdev->data_urbs_in = alloc_urbs(cdev, SNDRV_PCM_STREAM_CAPTURE, &ret);
 863         if (ret < 0) {
 864                 kfree(cdev->data_cb_info);
 865                 free_urbs(cdev->data_urbs_in);
 866                 return ret;
 867         }
 868
 869         cdev->data_urbs_out = alloc_urbs(cdev, SNDRV_PCM_STREAM_PLAYBACK, &ret);
 870         if (ret < 0) {
 871                 kfree(cdev->data_cb_info);
 872                 free_urbs(cdev->data_urbs_in);
 873                 free_urbs(cdev->data_urbs_out);
 874                 return ret;
 875         }
 876
 877         return 0;
 878 }
 879
 880 void snd_usb_caiaq_audio_free(struct snd_usb_caiaqdev *cdev)
 881 {
 882         struct device *dev = caiaqdev_to_dev(cdev);
 883
 884         dev_dbg(dev, "%s(%p)\n", __func__, cdev);
 885         stream_stop(cdev);
 886         free_urbs(cdev->data_urbs_in);
 887         free_urbs(cdev->data_urbs_out);
 888         kfree(cdev->data_cb_info);
 889 }
 890