linux/sound/usb/caiaq/audio.c
<<
>>
Prefs
   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
  46static 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
  63static void
  64activate_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
  77static void
  78deactivate_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
  92static int
  93all_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
 102static 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
 133static 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
 154static 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
 166static 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
 183static 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
 190static 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
 202static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
 203                                48000, 64000, 88200, 96000, 176400, 192000 };
 204
 205static 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
 291static 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
 314static snd_pcm_uframes_t
 315snd_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
 335unlock:
 336        spin_unlock(&cdev->spinlock);
 337        return ptr;
 338}
 339
 340/* operators for both playback and capture */
 341static 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        .mmap =         snd_pcm_lib_mmap_vmalloc,
 352};
 353
 354static void check_for_elapsed_periods(struct snd_usb_caiaqdev *cdev,
 355                                      struct snd_pcm_substream **subs)
 356{
 357        int stream, pb, *cnt;
 358        struct snd_pcm_substream *sub;
 359
 360        for (stream = 0; stream < cdev->n_streams; stream++) {
 361                sub = subs[stream];
 362                if (!sub)
 363                        continue;
 364
 365                pb = snd_pcm_lib_period_bytes(sub);
 366                cnt = (sub->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
 367                                        &cdev->period_out_count[stream] :
 368                                        &cdev->period_in_count[stream];
 369
 370                if (*cnt >= pb) {
 371                        snd_pcm_period_elapsed(sub);
 372                        *cnt %= pb;
 373                }
 374        }
 375}
 376
 377static void read_in_urb_mode0(struct snd_usb_caiaqdev *cdev,
 378                              const struct urb *urb,
 379                              const struct usb_iso_packet_descriptor *iso)
 380{
 381        unsigned char *usb_buf = urb->transfer_buffer + iso->offset;
 382        struct snd_pcm_substream *sub;
 383        int stream, i;
 384
 385        if (all_substreams_zero(cdev->sub_capture))
 386                return;
 387
 388        for (i = 0; i < iso->actual_length;) {
 389                for (stream = 0; stream < cdev->n_streams; stream++, i++) {
 390                        sub = cdev->sub_capture[stream];
 391                        if (sub) {
 392                                struct snd_pcm_runtime *rt = sub->runtime;
 393                                char *audio_buf = rt->dma_area;
 394                                int sz = frames_to_bytes(rt, rt->buffer_size);
 395                                audio_buf[cdev->audio_in_buf_pos[stream]++]
 396                                        = usb_buf[i];
 397                                cdev->period_in_count[stream]++;
 398                                if (cdev->audio_in_buf_pos[stream] == sz)
 399                                        cdev->audio_in_buf_pos[stream] = 0;
 400                        }
 401                }
 402        }
 403}
 404
 405static void read_in_urb_mode2(struct snd_usb_caiaqdev *cdev,
 406                              const struct urb *urb,
 407                              const struct usb_iso_packet_descriptor *iso)
 408{
 409        unsigned char *usb_buf = urb->transfer_buffer + iso->offset;
 410        unsigned char check_byte;
 411        struct snd_pcm_substream *sub;
 412        int stream, i;
 413
 414        for (i = 0; i < iso->actual_length;) {
 415                if (i % (cdev->n_streams * BYTES_PER_SAMPLE_USB) == 0) {
 416                        for (stream = 0;
 417                             stream < cdev->n_streams;
 418                             stream++, i++) {
 419                                if (cdev->first_packet)
 420                                        continue;
 421
 422                                check_byte = MAKE_CHECKBYTE(cdev, stream, i);
 423
 424                                if ((usb_buf[i] & 0x3f) != check_byte)
 425                                        cdev->input_panic = 1;
 426
 427                                if (usb_buf[i] & 0x80)
 428                                        cdev->output_panic = 1;
 429                        }
 430                }
 431                cdev->first_packet = 0;
 432
 433                for (stream = 0; stream < cdev->n_streams; stream++, i++) {
 434                        sub = cdev->sub_capture[stream];
 435                        if (cdev->input_panic)
 436                                usb_buf[i] = 0;
 437
 438                        if (sub) {
 439                                struct snd_pcm_runtime *rt = sub->runtime;
 440                                char *audio_buf = rt->dma_area;
 441                                int sz = frames_to_bytes(rt, rt->buffer_size);
 442                                audio_buf[cdev->audio_in_buf_pos[stream]++] =
 443                                        usb_buf[i];
 444                                cdev->period_in_count[stream]++;
 445                                if (cdev->audio_in_buf_pos[stream] == sz)
 446                                        cdev->audio_in_buf_pos[stream] = 0;
 447                        }
 448                }
 449        }
 450}
 451
 452static void read_in_urb_mode3(struct snd_usb_caiaqdev *cdev,
 453                              const struct urb *urb,
 454                              const struct usb_iso_packet_descriptor *iso)
 455{
 456        unsigned char *usb_buf = urb->transfer_buffer + iso->offset;
 457        struct device *dev = caiaqdev_to_dev(cdev);
 458        int stream, i;
 459
 460        /* paranoia check */
 461        if (iso->actual_length % (BYTES_PER_SAMPLE_USB * CHANNELS_PER_STREAM))
 462                return;
 463
 464        for (i = 0; i < iso->actual_length;) {
 465                for (stream = 0; stream < cdev->n_streams; stream++) {
 466                        struct snd_pcm_substream *sub = cdev->sub_capture[stream];
 467                        char *audio_buf = NULL;
 468                        int c, n, sz = 0;
 469
 470                        if (sub && !cdev->input_panic) {
 471                                struct snd_pcm_runtime *rt = sub->runtime;
 472                                audio_buf = rt->dma_area;
 473                                sz = frames_to_bytes(rt, rt->buffer_size);
 474                        }
 475
 476                        for (c = 0; c < CHANNELS_PER_STREAM; c++) {
 477                                /* 3 audio data bytes, followed by 1 check byte */
 478                                if (audio_buf) {
 479                                        for (n = 0; n < BYTES_PER_SAMPLE; n++) {
 480                                                audio_buf[cdev->audio_in_buf_pos[stream]++] = usb_buf[i+n];
 481
 482                                                if (cdev->audio_in_buf_pos[stream] == sz)
 483                                                        cdev->audio_in_buf_pos[stream] = 0;
 484                                        }
 485
 486                                        cdev->period_in_count[stream] += BYTES_PER_SAMPLE;
 487                                }
 488
 489                                i += BYTES_PER_SAMPLE;
 490
 491                                if (usb_buf[i] != ((stream << 1) | c) &&
 492                                    !cdev->first_packet) {
 493                                        if (!cdev->input_panic)
 494                                                dev_warn(dev, " EXPECTED: %02x got %02x, c %d, stream %d, i %d\n",
 495                                                         ((stream << 1) | c), usb_buf[i], c, stream, i);
 496                                        cdev->input_panic = 1;
 497                                }
 498
 499                                i++;
 500                        }
 501                }
 502        }
 503
 504        if (cdev->first_packet > 0)
 505                cdev->first_packet--;
 506}
 507
 508static void read_in_urb(struct snd_usb_caiaqdev *cdev,
 509                        const struct urb *urb,
 510                        const struct usb_iso_packet_descriptor *iso)
 511{
 512        struct device *dev = caiaqdev_to_dev(cdev);
 513
 514        if (!cdev->streaming)
 515                return;
 516
 517        if (iso->actual_length < cdev->bpp)
 518                return;
 519
 520        switch (cdev->spec.data_alignment) {
 521        case 0:
 522                read_in_urb_mode0(cdev, urb, iso);
 523                break;
 524        case 2:
 525                read_in_urb_mode2(cdev, urb, iso);
 526                break;
 527        case 3:
 528                read_in_urb_mode3(cdev, urb, iso);
 529                break;
 530        }
 531
 532        if ((cdev->input_panic || cdev->output_panic) && !cdev->warned) {
 533                dev_warn(dev, "streaming error detected %s %s\n",
 534                                cdev->input_panic ? "(input)" : "",
 535                                cdev->output_panic ? "(output)" : "");
 536                cdev->warned = 1;
 537        }
 538}
 539
 540static void fill_out_urb_mode_0(struct snd_usb_caiaqdev *cdev,
 541                                struct urb *urb,
 542                                const struct usb_iso_packet_descriptor *iso)
 543{
 544        unsigned char *usb_buf = urb->transfer_buffer + iso->offset;
 545        struct snd_pcm_substream *sub;
 546        int stream, i;
 547
 548        for (i = 0; i < iso->length;) {
 549                for (stream = 0; stream < cdev->n_streams; stream++, i++) {
 550                        sub = cdev->sub_playback[stream];
 551                        if (sub) {
 552                                struct snd_pcm_runtime *rt = sub->runtime;
 553                                char *audio_buf = rt->dma_area;
 554                                int sz = frames_to_bytes(rt, rt->buffer_size);
 555                                usb_buf[i] =
 556                                        audio_buf[cdev->audio_out_buf_pos[stream]];
 557                                cdev->period_out_count[stream]++;
 558                                cdev->audio_out_buf_pos[stream]++;
 559                                if (cdev->audio_out_buf_pos[stream] == sz)
 560                                        cdev->audio_out_buf_pos[stream] = 0;
 561                        } else
 562                                usb_buf[i] = 0;
 563                }
 564
 565                /* fill in the check bytes */
 566                if (cdev->spec.data_alignment == 2 &&
 567                    i % (cdev->n_streams * BYTES_PER_SAMPLE_USB) ==
 568                        (cdev->n_streams * CHANNELS_PER_STREAM))
 569                        for (stream = 0; stream < cdev->n_streams; stream++, i++)
 570                                usb_buf[i] = MAKE_CHECKBYTE(cdev, stream, i);
 571        }
 572}
 573
 574static void fill_out_urb_mode_3(struct snd_usb_caiaqdev *cdev,
 575                                struct urb *urb,
 576                                const struct usb_iso_packet_descriptor *iso)
 577{
 578        unsigned char *usb_buf = urb->transfer_buffer + iso->offset;
 579        int stream, i;
 580
 581        for (i = 0; i < iso->length;) {
 582                for (stream = 0; stream < cdev->n_streams; stream++) {
 583                        struct snd_pcm_substream *sub = cdev->sub_playback[stream];
 584                        char *audio_buf = NULL;
 585                        int c, n, sz = 0;
 586
 587                        if (sub) {
 588                                struct snd_pcm_runtime *rt = sub->runtime;
 589                                audio_buf = rt->dma_area;
 590                                sz = frames_to_bytes(rt, rt->buffer_size);
 591                        }
 592
 593                        for (c = 0; c < CHANNELS_PER_STREAM; c++) {
 594                                for (n = 0; n < BYTES_PER_SAMPLE; n++) {
 595                                        if (audio_buf) {
 596                                                usb_buf[i+n] = audio_buf[cdev->audio_out_buf_pos[stream]++];
 597
 598                                                if (cdev->audio_out_buf_pos[stream] == sz)
 599                                                        cdev->audio_out_buf_pos[stream] = 0;
 600                                        } else {
 601                                                usb_buf[i+n] = 0;
 602                                        }
 603                                }
 604
 605                                if (audio_buf)
 606                                        cdev->period_out_count[stream] += BYTES_PER_SAMPLE;
 607
 608                                i += BYTES_PER_SAMPLE;
 609
 610                                /* fill in the check byte pattern */
 611                                usb_buf[i++] = (stream << 1) | c;
 612                        }
 613                }
 614        }
 615}
 616
 617static inline void fill_out_urb(struct snd_usb_caiaqdev *cdev,
 618                                struct urb *urb,
 619                                const struct usb_iso_packet_descriptor *iso)
 620{
 621        switch (cdev->spec.data_alignment) {
 622        case 0:
 623        case 2:
 624                fill_out_urb_mode_0(cdev, urb, iso);
 625                break;
 626        case 3:
 627                fill_out_urb_mode_3(cdev, urb, iso);
 628                break;
 629        }
 630}
 631
 632static void read_completed(struct urb *urb)
 633{
 634        struct snd_usb_caiaq_cb_info *info = urb->context;
 635        struct snd_usb_caiaqdev *cdev;
 636        struct device *dev;
 637        struct urb *out = NULL;
 638        int i, frame, len, send_it = 0, outframe = 0;
 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(&cdev->spinlock);
 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(&cdev->spinlock);
 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
 695requeue:
 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
 707static 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
 720static 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
 775static 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
 794int 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
 893void 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
 904