kernel/sound/usb/line6/pcm.c

   1 /*
   2  * Line 6 Linux USB driver
   3  *
   4  * Copyright (C) 2004-2010 Markus Grabner (grabner@icg.tugraz.at)
   5  *
   6  *      This program is free software; you can redistribute it and/or
   7  *      modify it under the terms of the GNU General Public License as
   8  *      published by the Free Software Foundation, version 2.
   9  *
  10  */
  11
  12 #include <linux/slab.h>
  13 #include <linux/export.h>
  14 #include <sound/core.h>
  15 #include <sound/control.h>
  16 #include <sound/pcm.h>
  17 #include <sound/pcm_params.h>
  18
  19 #include "capture.h"
  20 #include "driver.h"
  21 #include "playback.h"
  22
  23 /* impulse response volume controls */
  24 static int snd_line6_impulse_volume_info(struct snd_kcontrol *kcontrol,
  25                                          struct snd_ctl_elem_info *uinfo)
  26 {
  27         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
  28         uinfo->count = 1;
  29         uinfo->value.integer.min = 0;
  30         uinfo->value.integer.max = 255;
  31         return 0;
  32 }
  33
  34 static int snd_line6_impulse_volume_get(struct snd_kcontrol *kcontrol,
  35                                         struct snd_ctl_elem_value *ucontrol)
  36 {
  37         struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);
  38
  39         ucontrol->value.integer.value[0] = line6pcm->impulse_volume;
  40         return 0;
  41 }
  42
  43 static int snd_line6_impulse_volume_put(struct snd_kcontrol *kcontrol,
  44                                         struct snd_ctl_elem_value *ucontrol)
  45 {
  46         struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);
  47         int value = ucontrol->value.integer.value[0];
  48         int err;
  49
  50         if (line6pcm->impulse_volume == value)
  51                 return 0;
  52
  53         line6pcm->impulse_volume = value;
  54         if (value > 0) {
  55                 err = line6_pcm_acquire(line6pcm, LINE6_STREAM_IMPULSE);
  56                 if (err < 0) {
  57                         line6pcm->impulse_volume = 0;
  58                         line6_pcm_release(line6pcm, LINE6_STREAM_IMPULSE);
  59                         return err;
  60                 }
  61         } else {
  62                 line6_pcm_release(line6pcm, LINE6_STREAM_IMPULSE);
  63         }
  64         return 1;
  65 }
  66
  67 /* impulse response period controls */
  68 static int snd_line6_impulse_period_info(struct snd_kcontrol *kcontrol,
  69                                          struct snd_ctl_elem_info *uinfo)
  70 {
  71         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
  72         uinfo->count = 1;
  73         uinfo->value.integer.min = 0;
  74         uinfo->value.integer.max = 2000;
  75         return 0;
  76 }
  77
  78 static int snd_line6_impulse_period_get(struct snd_kcontrol *kcontrol,
  79                                         struct snd_ctl_elem_value *ucontrol)
  80 {
  81         struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);
  82
  83         ucontrol->value.integer.value[0] = line6pcm->impulse_period;
  84         return 0;
  85 }
  86
  87 static int snd_line6_impulse_period_put(struct snd_kcontrol *kcontrol,
  88                                         struct snd_ctl_elem_value *ucontrol)
  89 {
  90         struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);
  91         int value = ucontrol->value.integer.value[0];
  92
  93         if (line6pcm->impulse_period == value)
  94                 return 0;
  95
  96         line6pcm->impulse_period = value;
  97         return 1;
  98 }
  99
 100 /*
 101         Unlink all currently active URBs.
 102 */
 103 static void line6_unlink_audio_urbs(struct snd_line6_pcm *line6pcm,
 104                                     struct line6_pcm_stream *pcms)
 105 {
 106         int i;
 107
 108         for (i = 0; i < LINE6_ISO_BUFFERS; i++) {
 109                 if (test_bit(i, &pcms->active_urbs)) {
 110                         if (!test_and_set_bit(i, &pcms->unlink_urbs))
 111                                 usb_unlink_urb(pcms->urbs[i]);
 112                 }
 113         }
 114 }
 115
 116 /*
 117         Wait until unlinking of all currently active URBs has been finished.
 118 */
 119 static void line6_wait_clear_audio_urbs(struct snd_line6_pcm *line6pcm,
 120                                         struct line6_pcm_stream *pcms)
 121 {
 122         int timeout = HZ;
 123         int i;
 124         int alive;
 125
 126         do {
 127                 alive = 0;
 128                 for (i = 0; i < LINE6_ISO_BUFFERS; i++) {
 129                         if (test_bit(i, &pcms->active_urbs))
 130                                 alive++;
 131                 }
 132                 if (!alive)
 133                         break;
 134                 set_current_state(TASK_UNINTERRUPTIBLE);
 135                 schedule_timeout(1);
 136         } while (--timeout > 0);
 137         if (alive)
 138                 dev_err(line6pcm->line6->ifcdev,
 139                         "timeout: still %d active urbs..\n", alive);
 140 }
 141
 142 static inline struct line6_pcm_stream *
 143 get_stream(struct snd_line6_pcm *line6pcm, int direction)
 144 {
 145         return (direction == SNDRV_PCM_STREAM_PLAYBACK) ?
 146                 &line6pcm->out : &line6pcm->in;
 147 }
 148
 149 /* allocate a buffer if not opened yet;
 150  * call this in line6pcm.state_change mutex
 151  */
 152 static int line6_buffer_acquire(struct snd_line6_pcm *line6pcm,
 153                                 struct line6_pcm_stream *pstr, int type)
 154 {
 155         /* Invoked multiple times in a row so allocate once only */
 156         if (!test_and_set_bit(type, &pstr->opened) && !pstr->buffer) {
 157                 pstr->buffer = kmalloc(LINE6_ISO_BUFFERS * LINE6_ISO_PACKETS *
 158                                        line6pcm->max_packet_size, GFP_KERNEL);
 159                 if (!pstr->buffer)
 160                         return -ENOMEM;
 161         }
 162         return 0;
 163 }
 164
 165 /* free a buffer if all streams are closed;
 166  * call this in line6pcm.state_change mutex
 167  */
 168 static void line6_buffer_release(struct snd_line6_pcm *line6pcm,
 169                                  struct line6_pcm_stream *pstr, int type)
 170 {
 171
 172         clear_bit(type, &pstr->opened);
 173         if (!pstr->opened) {
 174                 line6_wait_clear_audio_urbs(line6pcm, pstr);
 175                 kfree(pstr->buffer);
 176                 pstr->buffer = NULL;
 177         }
 178 }
 179
 180 /* start a PCM stream */
 181 static int line6_stream_start(struct snd_line6_pcm *line6pcm, int direction,
 182                               int type)
 183 {
 184         unsigned long flags;
 185         struct line6_pcm_stream *pstr = get_stream(line6pcm, direction);
 186         int ret = 0;
 187
 188         spin_lock_irqsave(&pstr->lock, flags);
 189         if (!test_and_set_bit(type, &pstr->running)) {
 190                 if (pstr->active_urbs || pstr->unlink_urbs) {
 191                         ret = -EBUSY;
 192                         goto error;
 193                 }
 194
 195                 pstr->count = 0;
 196                 /* Submit all currently available URBs */
 197                 if (direction == SNDRV_PCM_STREAM_PLAYBACK)
 198                         ret = line6_submit_audio_out_all_urbs(line6pcm);
 199                 else
 200                         ret = line6_submit_audio_in_all_urbs(line6pcm);
 201         }
 202  error:
 203         if (ret < 0)
 204                 clear_bit(type, &pstr->running);
 205         spin_unlock_irqrestore(&pstr->lock, flags);
 206         return ret;
 207 }
 208
 209 /* stop a PCM stream; this doesn't sync with the unlinked URBs */
 210 static void line6_stream_stop(struct snd_line6_pcm *line6pcm, int direction,
 211                           int type)
 212 {
 213         unsigned long flags;
 214         struct line6_pcm_stream *pstr = get_stream(line6pcm, direction);
 215
 216         spin_lock_irqsave(&pstr->lock, flags);
 217         clear_bit(type, &pstr->running);
 218         if (!pstr->running) {
 219                 line6_unlink_audio_urbs(line6pcm, pstr);
 220                 if (direction == SNDRV_PCM_STREAM_CAPTURE) {
 221                         line6pcm->prev_fbuf = NULL;
 222                         line6pcm->prev_fsize = 0;
 223                 }
 224         }
 225         spin_unlock_irqrestore(&pstr->lock, flags);
 226 }
 227
 228 /* common PCM trigger callback */
 229 int snd_line6_trigger(struct snd_pcm_substream *substream, int cmd)
 230 {
 231         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 232         struct snd_pcm_substream *s;
 233         int err;
 234
 235         clear_bit(LINE6_FLAG_PREPARED, &line6pcm->flags);
 236
 237         snd_pcm_group_for_each_entry(s, substream) {
 238                 if (s->pcm->card != substream->pcm->card)
 239                         continue;
 240
 241                 switch (cmd) {
 242                 case SNDRV_PCM_TRIGGER_START:
 243                 case SNDRV_PCM_TRIGGER_RESUME:
 244                         err = line6_stream_start(line6pcm, s->stream,
 245                                                  LINE6_STREAM_PCM);
 246                         if (err < 0)
 247                                 return err;
 248                         break;
 249
 250                 case SNDRV_PCM_TRIGGER_STOP:
 251                 case SNDRV_PCM_TRIGGER_SUSPEND:
 252                         line6_stream_stop(line6pcm, s->stream,
 253                                           LINE6_STREAM_PCM);
 254                         break;
 255
 256                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 257                         if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
 258                                 return -EINVAL;
 259                         set_bit(LINE6_FLAG_PAUSE_PLAYBACK, &line6pcm->flags);
 260                         break;
 261
 262                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 263                         if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
 264                                 return -EINVAL;
 265                         clear_bit(LINE6_FLAG_PAUSE_PLAYBACK, &line6pcm->flags);
 266                         break;
 267
 268                 default:
 269                         return -EINVAL;
 270                 }
 271         }
 272
 273         return 0;
 274 }
 275
 276 /* common PCM pointer callback */
 277 snd_pcm_uframes_t snd_line6_pointer(struct snd_pcm_substream *substream)
 278 {
 279         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 280         struct line6_pcm_stream *pstr = get_stream(line6pcm, substream->stream);
 281
 282         return pstr->pos_done;
 283 }
 284
 285 /* Acquire and start duplex streams:
 286  * type is either LINE6_STREAM_IMPULSE or LINE6_STREAM_MONITOR
 287  */
 288 int line6_pcm_acquire(struct snd_line6_pcm *line6pcm, int type)
 289 {
 290         struct line6_pcm_stream *pstr;
 291         int ret = 0, dir;
 292
 293         mutex_lock(&line6pcm->state_mutex);
 294         for (dir = 0; dir < 2; dir++) {
 295                 pstr = get_stream(line6pcm, dir);
 296                 ret = line6_buffer_acquire(line6pcm, pstr, type);
 297                 if (ret < 0)
 298                         goto error;
 299                 if (!pstr->running)
 300                         line6_wait_clear_audio_urbs(line6pcm, pstr);
 301         }
 302         for (dir = 0; dir < 2; dir++) {
 303                 ret = line6_stream_start(line6pcm, dir, type);
 304                 if (ret < 0)
 305                         goto error;
 306         }
 307  error:
 308         mutex_unlock(&line6pcm->state_mutex);
 309         if (ret < 0)
 310                 line6_pcm_release(line6pcm, type);
 311         return ret;
 312 }
 313 EXPORT_SYMBOL_GPL(line6_pcm_acquire);
 314
 315 /* Stop and release duplex streams */
 316 void line6_pcm_release(struct snd_line6_pcm *line6pcm, int type)
 317 {
 318         struct line6_pcm_stream *pstr;
 319         int dir;
 320
 321         mutex_lock(&line6pcm->state_mutex);
 322         for (dir = 0; dir < 2; dir++)
 323                 line6_stream_stop(line6pcm, dir, type);
 324         for (dir = 0; dir < 2; dir++) {
 325                 pstr = get_stream(line6pcm, dir);
 326                 line6_buffer_release(line6pcm, pstr, type);
 327         }
 328         mutex_unlock(&line6pcm->state_mutex);
 329 }
 330 EXPORT_SYMBOL_GPL(line6_pcm_release);
 331
 332 /* common PCM hw_params callback */
 333 int snd_line6_hw_params(struct snd_pcm_substream *substream,
 334                         struct snd_pcm_hw_params *hw_params)
 335 {
 336         int ret;
 337         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 338         struct line6_pcm_stream *pstr = get_stream(line6pcm, substream->stream);
 339
 340         mutex_lock(&line6pcm->state_mutex);
 341         ret = line6_buffer_acquire(line6pcm, pstr, LINE6_STREAM_PCM);
 342         if (ret < 0)
 343                 goto error;
 344
 345         ret = snd_pcm_lib_malloc_pages(substream,
 346                                        params_buffer_bytes(hw_params));
 347         if (ret < 0) {
 348                 line6_buffer_release(line6pcm, pstr, LINE6_STREAM_PCM);
 349                 goto error;
 350         }
 351
 352         pstr->period = params_period_bytes(hw_params);
 353  error:
 354         mutex_unlock(&line6pcm->state_mutex);
 355         return ret;
 356 }
 357
 358 /* common PCM hw_free callback */
 359 int snd_line6_hw_free(struct snd_pcm_substream *substream)
 360 {
 361         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 362         struct line6_pcm_stream *pstr = get_stream(line6pcm, substream->stream);
 363
 364         mutex_lock(&line6pcm->state_mutex);
 365         line6_buffer_release(line6pcm, pstr, LINE6_STREAM_PCM);
 366         mutex_unlock(&line6pcm->state_mutex);
 367         return snd_pcm_lib_free_pages(substream);
 368 }
 369
 370
 371 /* control info callback */
 372 static int snd_line6_control_playback_info(struct snd_kcontrol *kcontrol,
 373                                            struct snd_ctl_elem_info *uinfo)
 374 {
 375         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 376         uinfo->count = 2;
 377         uinfo->value.integer.min = 0;
 378         uinfo->value.integer.max = 256;
 379         return 0;
 380 }
 381
 382 /* control get callback */
 383 static int snd_line6_control_playback_get(struct snd_kcontrol *kcontrol,
 384                                           struct snd_ctl_elem_value *ucontrol)
 385 {
 386         int i;
 387         struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);
 388
 389         for (i = 0; i < 2; i++)
 390                 ucontrol->value.integer.value[i] = line6pcm->volume_playback[i];
 391
 392         return 0;
 393 }
 394
 395 /* control put callback */
 396 static int snd_line6_control_playback_put(struct snd_kcontrol *kcontrol,
 397                                           struct snd_ctl_elem_value *ucontrol)
 398 {
 399         int i, changed = 0;
 400         struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);
 401
 402         for (i = 0; i < 2; i++)
 403                 if (line6pcm->volume_playback[i] !=
 404                     ucontrol->value.integer.value[i]) {
 405                         line6pcm->volume_playback[i] =
 406                             ucontrol->value.integer.value[i];
 407                         changed = 1;
 408                 }
 409
 410         return changed;
 411 }
 412
 413 /* control definition */
 414 static struct snd_kcontrol_new line6_controls[] = {
 415         {
 416                 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 417                 .name = "PCM Playback Volume",
 418                 .info = snd_line6_control_playback_info,
 419                 .get = snd_line6_control_playback_get,
 420                 .put = snd_line6_control_playback_put
 421         },
 422         {
 423                 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 424                 .name = "Impulse Response Volume",
 425                 .info = snd_line6_impulse_volume_info,
 426                 .get = snd_line6_impulse_volume_get,
 427                 .put = snd_line6_impulse_volume_put
 428         },
 429         {
 430                 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 431                 .name = "Impulse Response Period",
 432                 .info = snd_line6_impulse_period_info,
 433                 .get = snd_line6_impulse_period_get,
 434                 .put = snd_line6_impulse_period_put
 435         },
 436 };
 437
 438 /*
 439         Cleanup the PCM device.
 440 */
 441 static void cleanup_urbs(struct line6_pcm_stream *pcms)
 442 {
 443         int i;
 444
 445         for (i = 0; i < LINE6_ISO_BUFFERS; i++) {
 446                 if (pcms->urbs[i]) {
 447                         usb_kill_urb(pcms->urbs[i]);
 448                         usb_free_urb(pcms->urbs[i]);
 449                 }
 450         }
 451 }
 452
 453 static void line6_cleanup_pcm(struct snd_pcm *pcm)
 454 {
 455         struct snd_line6_pcm *line6pcm = snd_pcm_chip(pcm);
 456
 457         cleanup_urbs(&line6pcm->out);
 458         cleanup_urbs(&line6pcm->in);
 459         kfree(line6pcm);
 460 }
 461
 462 /* create a PCM device */
 463 static int snd_line6_new_pcm(struct usb_line6 *line6, struct snd_pcm **pcm_ret)
 464 {
 465         struct snd_pcm *pcm;
 466         int err;
 467
 468         err = snd_pcm_new(line6->card, (char *)line6->properties->name,
 469                           0, 1, 1, pcm_ret);
 470         if (err < 0)
 471                 return err;
 472         pcm = *pcm_ret;
 473         strcpy(pcm->name, line6->properties->name);
 474
 475         /* set operators */
 476         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
 477                         &snd_line6_playback_ops);
 478         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_line6_capture_ops);
 479
 480         /* pre-allocation of buffers */
 481         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
 482                                               snd_dma_continuous_data
 483                                               (GFP_KERNEL), 64 * 1024,
 484                                               128 * 1024);
 485         return 0;
 486 }
 487
 488 /*
 489         Sync with PCM stream stops.
 490 */
 491 void line6_pcm_disconnect(struct snd_line6_pcm *line6pcm)
 492 {
 493         line6_unlink_audio_urbs(line6pcm, &line6pcm->out);
 494         line6_unlink_audio_urbs(line6pcm, &line6pcm->in);
 495         line6_wait_clear_audio_urbs(line6pcm, &line6pcm->out);
 496         line6_wait_clear_audio_urbs(line6pcm, &line6pcm->in);
 497 }
 498
 499 /*
 500         Create and register the PCM device and mixer entries.
 501         Create URBs for playback and capture.
 502 */
 503 int line6_init_pcm(struct usb_line6 *line6,
 504                    struct line6_pcm_properties *properties)
 505 {
 506         int i, err;
 507         unsigned ep_read = line6->properties->ep_audio_r;
 508         unsigned ep_write = line6->properties->ep_audio_w;
 509         struct snd_pcm *pcm;
 510         struct snd_line6_pcm *line6pcm;
 511
 512         if (!(line6->properties->capabilities & LINE6_CAP_PCM))
 513                 return 0;       /* skip PCM initialization and report success */
 514
 515         err = snd_line6_new_pcm(line6, &pcm);
 516         if (err < 0)
 517                 return err;
 518
 519         line6pcm = kzalloc(sizeof(*line6pcm), GFP_KERNEL);
 520         if (!line6pcm)
 521                 return -ENOMEM;
 522
 523         mutex_init(&line6pcm->state_mutex);
 524         line6pcm->pcm = pcm;
 525         line6pcm->properties = properties;
 526         line6pcm->volume_playback[0] = line6pcm->volume_playback[1] = 255;
 527         line6pcm->volume_monitor = 255;
 528         line6pcm->line6 = line6;
 529
 530         /* Read and write buffers are sized identically, so choose minimum */
 531         line6pcm->max_packet_size = min(
 532                         usb_maxpacket(line6->usbdev,
 533                                 usb_rcvisocpipe(line6->usbdev, ep_read), 0),
 534                         usb_maxpacket(line6->usbdev,
 535                                 usb_sndisocpipe(line6->usbdev, ep_write), 1));
 536
 537         spin_lock_init(&line6pcm->out.lock);
 538         spin_lock_init(&line6pcm->in.lock);
 539         line6pcm->impulse_period = LINE6_IMPULSE_DEFAULT_PERIOD;
 540
 541         line6->line6pcm = line6pcm;
 542
 543         pcm->private_data = line6pcm;
 544         pcm->private_free = line6_cleanup_pcm;
 545
 546         err = line6_create_audio_out_urbs(line6pcm);
 547         if (err < 0)
 548                 return err;
 549
 550         err = line6_create_audio_in_urbs(line6pcm);
 551         if (err < 0)
 552                 return err;
 553
 554         /* mixer: */
 555         for (i = 0; i < ARRAY_SIZE(line6_controls); i++) {
 556                 err = snd_ctl_add(line6->card,
 557                                   snd_ctl_new1(&line6_controls[i], line6pcm));
 558                 if (err < 0)
 559                         return err;
 560         }
 561
 562         return 0;
 563 }
 564 EXPORT_SYMBOL_GPL(line6_init_pcm);
 565
 566 /* prepare pcm callback */
 567 int snd_line6_prepare(struct snd_pcm_substream *substream)
 568 {
 569         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 570         struct line6_pcm_stream *pstr = get_stream(line6pcm, substream->stream);
 571
 572         mutex_lock(&line6pcm->state_mutex);
 573         if (!pstr->running)
 574                 line6_wait_clear_audio_urbs(line6pcm, pstr);
 575
 576         if (!test_and_set_bit(LINE6_FLAG_PREPARED, &line6pcm->flags)) {
 577                 line6pcm->out.count = 0;
 578                 line6pcm->out.pos = 0;
 579                 line6pcm->out.pos_done = 0;
 580                 line6pcm->out.bytes = 0;
 581                 line6pcm->in.count = 0;
 582                 line6pcm->in.pos_done = 0;
 583                 line6pcm->in.bytes = 0;
 584         }
 585
 586         mutex_unlock(&line6pcm->state_mutex);
 587         return 0;
 588 }