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