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             !(pstr->active_urbs || pstr->unlink_urbs)) {
 191                 pstr->count = 0;
 192                 /* Submit all currently available URBs */
 193                 if (direction == SNDRV_PCM_STREAM_PLAYBACK)
 194                         ret = line6_submit_audio_out_all_urbs(line6pcm);
 195                 else
 196                         ret = line6_submit_audio_in_all_urbs(line6pcm);
 197         }
 198         if (ret < 0)
 199                 clear_bit(type, &pstr->running);
 200         spin_unlock_irqrestore(&pstr->lock, flags);
 201         return ret;
 202 }
 203
 204 /* stop a PCM stream; this doesn't sync with the unlinked URBs */
 205 static void line6_stream_stop(struct snd_line6_pcm *line6pcm, int direction,
 206                           int type)
 207 {
 208         unsigned long flags;
 209         struct line6_pcm_stream *pstr = get_stream(line6pcm, direction);
 210
 211         spin_lock_irqsave(&pstr->lock, flags);
 212         clear_bit(type, &pstr->running);
 213         if (!pstr->running) {
 214                 line6_unlink_audio_urbs(line6pcm, pstr);
 215                 if (direction == SNDRV_PCM_STREAM_CAPTURE) {
 216                         line6pcm->prev_fbuf = NULL;
 217                         line6pcm->prev_fsize = 0;
 218                 }
 219         }
 220         spin_unlock_irqrestore(&pstr->lock, flags);
 221 }
 222
 223 /* common PCM trigger callback */
 224 int snd_line6_trigger(struct snd_pcm_substream *substream, int cmd)
 225 {
 226         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 227         struct snd_pcm_substream *s;
 228         int err;
 229
 230         clear_bit(LINE6_FLAG_PREPARED, &line6pcm->flags);
 231
 232         snd_pcm_group_for_each_entry(s, substream) {
 233                 if (s->pcm->card != substream->pcm->card)
 234                         continue;
 235
 236                 switch (cmd) {
 237                 case SNDRV_PCM_TRIGGER_START:
 238                 case SNDRV_PCM_TRIGGER_RESUME:
 239                         err = line6_stream_start(line6pcm, s->stream,
 240                                                  LINE6_STREAM_PCM);
 241                         if (err < 0)
 242                                 return err;
 243                         break;
 244
 245                 case SNDRV_PCM_TRIGGER_STOP:
 246                 case SNDRV_PCM_TRIGGER_SUSPEND:
 247                         line6_stream_stop(line6pcm, s->stream,
 248                                           LINE6_STREAM_PCM);
 249                         break;
 250
 251                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 252                         if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
 253                                 return -EINVAL;
 254                         set_bit(LINE6_FLAG_PAUSE_PLAYBACK, &line6pcm->flags);
 255                         break;
 256
 257                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 258                         if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
 259                                 return -EINVAL;
 260                         clear_bit(LINE6_FLAG_PAUSE_PLAYBACK, &line6pcm->flags);
 261                         break;
 262
 263                 default:
 264                         return -EINVAL;
 265                 }
 266         }
 267
 268         return 0;
 269 }
 270
 271 /* common PCM pointer callback */
 272 snd_pcm_uframes_t snd_line6_pointer(struct snd_pcm_substream *substream)
 273 {
 274         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 275         struct line6_pcm_stream *pstr = get_stream(line6pcm, substream->stream);
 276
 277         return pstr->pos_done;
 278 }
 279
 280 /* Acquire and start duplex streams:
 281  * type is either LINE6_STREAM_IMPULSE or LINE6_STREAM_MONITOR
 282  */
 283 int line6_pcm_acquire(struct snd_line6_pcm *line6pcm, int type)
 284 {
 285         struct line6_pcm_stream *pstr;
 286         int ret = 0, dir;
 287
 288         mutex_lock(&line6pcm->state_mutex);
 289         for (dir = 0; dir < 2; dir++) {
 290                 pstr = get_stream(line6pcm, dir);
 291                 ret = line6_buffer_acquire(line6pcm, pstr, type);
 292                 if (ret < 0)
 293                         goto error;
 294                 if (!pstr->running)
 295                         line6_wait_clear_audio_urbs(line6pcm, pstr);
 296         }
 297         for (dir = 0; dir < 2; dir++) {
 298                 ret = line6_stream_start(line6pcm, dir, type);
 299                 if (ret < 0)
 300                         goto error;
 301         }
 302  error:
 303         mutex_unlock(&line6pcm->state_mutex);
 304         if (ret < 0)
 305                 line6_pcm_release(line6pcm, type);
 306         return ret;
 307 }
 308 EXPORT_SYMBOL_GPL(line6_pcm_acquire);
 309
 310 /* Stop and release duplex streams */
 311 void line6_pcm_release(struct snd_line6_pcm *line6pcm, int type)
 312 {
 313         struct line6_pcm_stream *pstr;
 314         int dir;
 315
 316         mutex_lock(&line6pcm->state_mutex);
 317         for (dir = 0; dir < 2; dir++)
 318                 line6_stream_stop(line6pcm, dir, type);
 319         for (dir = 0; dir < 2; dir++) {
 320                 pstr = get_stream(line6pcm, dir);
 321                 line6_buffer_release(line6pcm, pstr, type);
 322         }
 323         mutex_unlock(&line6pcm->state_mutex);
 324 }
 325 EXPORT_SYMBOL_GPL(line6_pcm_release);
 326
 327 /* common PCM hw_params callback */
 328 int snd_line6_hw_params(struct snd_pcm_substream *substream,
 329                         struct snd_pcm_hw_params *hw_params)
 330 {
 331         int ret;
 332         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 333         struct line6_pcm_stream *pstr = get_stream(line6pcm, substream->stream);
 334
 335         mutex_lock(&line6pcm->state_mutex);
 336         ret = line6_buffer_acquire(line6pcm, pstr, LINE6_STREAM_PCM);
 337         if (ret < 0)
 338                 goto error;
 339
 340         ret = snd_pcm_lib_malloc_pages(substream,
 341                                        params_buffer_bytes(hw_params));
 342         if (ret < 0) {
 343                 line6_buffer_release(line6pcm, pstr, LINE6_STREAM_PCM);
 344                 goto error;
 345         }
 346
 347         pstr->period = params_period_bytes(hw_params);
 348  error:
 349         mutex_unlock(&line6pcm->state_mutex);
 350         return ret;
 351 }
 352
 353 /* common PCM hw_free callback */
 354 int snd_line6_hw_free(struct snd_pcm_substream *substream)
 355 {
 356         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 357         struct line6_pcm_stream *pstr = get_stream(line6pcm, substream->stream);
 358
 359         mutex_lock(&line6pcm->state_mutex);
 360         line6_buffer_release(line6pcm, pstr, LINE6_STREAM_PCM);
 361         mutex_unlock(&line6pcm->state_mutex);
 362         return snd_pcm_lib_free_pages(substream);
 363 }
 364
 365
 366 /* control info callback */
 367 static int snd_line6_control_playback_info(struct snd_kcontrol *kcontrol,
 368                                            struct snd_ctl_elem_info *uinfo)
 369 {
 370         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 371         uinfo->count = 2;
 372         uinfo->value.integer.min = 0;
 373         uinfo->value.integer.max = 256;
 374         return 0;
 375 }
 376
 377 /* control get callback */
 378 static int snd_line6_control_playback_get(struct snd_kcontrol *kcontrol,
 379                                           struct snd_ctl_elem_value *ucontrol)
 380 {
 381         int i;
 382         struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);
 383
 384         for (i = 0; i < 2; i++)
 385                 ucontrol->value.integer.value[i] = line6pcm->volume_playback[i];
 386
 387         return 0;
 388 }
 389
 390 /* control put callback */
 391 static int snd_line6_control_playback_put(struct snd_kcontrol *kcontrol,
 392                                           struct snd_ctl_elem_value *ucontrol)
 393 {
 394         int i, changed = 0;
 395         struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);
 396
 397         for (i = 0; i < 2; i++)
 398                 if (line6pcm->volume_playback[i] !=
 399                     ucontrol->value.integer.value[i]) {
 400                         line6pcm->volume_playback[i] =
 401                             ucontrol->value.integer.value[i];
 402                         changed = 1;
 403                 }
 404
 405         return changed;
 406 }
 407
 408 /* control definition */
 409 static struct snd_kcontrol_new line6_controls[] = {
 410         {
 411                 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 412                 .name = "PCM Playback Volume",
 413                 .info = snd_line6_control_playback_info,
 414                 .get = snd_line6_control_playback_get,
 415                 .put = snd_line6_control_playback_put
 416         },
 417         {
 418                 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 419                 .name = "Impulse Response Volume",
 420                 .info = snd_line6_impulse_volume_info,
 421                 .get = snd_line6_impulse_volume_get,
 422                 .put = snd_line6_impulse_volume_put
 423         },
 424         {
 425                 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 426                 .name = "Impulse Response Period",
 427                 .info = snd_line6_impulse_period_info,
 428                 .get = snd_line6_impulse_period_get,
 429                 .put = snd_line6_impulse_period_put
 430         },
 431 };
 432
 433 /*
 434         Cleanup the PCM device.
 435 */
 436 static void cleanup_urbs(struct line6_pcm_stream *pcms)
 437 {
 438         int i;
 439
 440         for (i = 0; i < LINE6_ISO_BUFFERS; i++) {
 441                 if (pcms->urbs[i]) {
 442                         usb_kill_urb(pcms->urbs[i]);
 443                         usb_free_urb(pcms->urbs[i]);
 444                 }
 445         }
 446 }
 447
 448 static void line6_cleanup_pcm(struct snd_pcm *pcm)
 449 {
 450         struct snd_line6_pcm *line6pcm = snd_pcm_chip(pcm);
 451
 452         cleanup_urbs(&line6pcm->out);
 453         cleanup_urbs(&line6pcm->in);
 454         kfree(line6pcm);
 455 }
 456
 457 /* create a PCM device */
 458 static int snd_line6_new_pcm(struct usb_line6 *line6, struct snd_pcm **pcm_ret)
 459 {
 460         struct snd_pcm *pcm;
 461         int err;
 462
 463         err = snd_pcm_new(line6->card, (char *)line6->properties->name,
 464                           0, 1, 1, pcm_ret);
 465         if (err < 0)
 466                 return err;
 467         pcm = *pcm_ret;
 468         strcpy(pcm->name, line6->properties->name);
 469
 470         /* set operators */
 471         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
 472                         &snd_line6_playback_ops);
 473         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_line6_capture_ops);
 474
 475         /* pre-allocation of buffers */
 476         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
 477                                               snd_dma_continuous_data
 478                                               (GFP_KERNEL), 64 * 1024,
 479                                               128 * 1024);
 480         return 0;
 481 }
 482
 483 /*
 484         Sync with PCM stream stops.
 485 */
 486 void line6_pcm_disconnect(struct snd_line6_pcm *line6pcm)
 487 {
 488         line6_unlink_audio_urbs(line6pcm, &line6pcm->out);
 489         line6_unlink_audio_urbs(line6pcm, &line6pcm->in);
 490         line6_wait_clear_audio_urbs(line6pcm, &line6pcm->out);
 491         line6_wait_clear_audio_urbs(line6pcm, &line6pcm->in);
 492 }
 493
 494 /*
 495         Create and register the PCM device and mixer entries.
 496         Create URBs for playback and capture.
 497 */
 498 int line6_init_pcm(struct usb_line6 *line6,
 499                    struct line6_pcm_properties *properties)
 500 {
 501         int i, err;
 502         unsigned ep_read = line6->properties->ep_audio_r;
 503         unsigned ep_write = line6->properties->ep_audio_w;
 504         struct snd_pcm *pcm;
 505         struct snd_line6_pcm *line6pcm;
 506
 507         if (!(line6->properties->capabilities & LINE6_CAP_PCM))
 508                 return 0;       /* skip PCM initialization and report success */
 509
 510         err = snd_line6_new_pcm(line6, &pcm);
 511         if (err < 0)
 512                 return err;
 513
 514         line6pcm = kzalloc(sizeof(*line6pcm), GFP_KERNEL);
 515         if (!line6pcm)
 516                 return -ENOMEM;
 517
 518         mutex_init(&line6pcm->state_mutex);
 519         line6pcm->pcm = pcm;
 520         line6pcm->properties = properties;
 521         line6pcm->volume_playback[0] = line6pcm->volume_playback[1] = 255;
 522         line6pcm->volume_monitor = 255;
 523         line6pcm->line6 = line6;
 524
 525         /* Read and write buffers are sized identically, so choose minimum */
 526         line6pcm->max_packet_size = min(
 527                         usb_maxpacket(line6->usbdev,
 528                                 usb_rcvisocpipe(line6->usbdev, ep_read), 0),
 529                         usb_maxpacket(line6->usbdev,
 530                                 usb_sndisocpipe(line6->usbdev, ep_write), 1));
 531
 532         spin_lock_init(&line6pcm->out.lock);
 533         spin_lock_init(&line6pcm->in.lock);
 534         line6pcm->impulse_period = LINE6_IMPULSE_DEFAULT_PERIOD;
 535
 536         line6->line6pcm = line6pcm;
 537
 538         pcm->private_data = line6pcm;
 539         pcm->private_free = line6_cleanup_pcm;
 540
 541         err = line6_create_audio_out_urbs(line6pcm);
 542         if (err < 0)
 543                 return err;
 544
 545         err = line6_create_audio_in_urbs(line6pcm);
 546         if (err < 0)
 547                 return err;
 548
 549         /* mixer: */
 550         for (i = 0; i < ARRAY_SIZE(line6_controls); i++) {
 551                 err = snd_ctl_add(line6->card,
 552                                   snd_ctl_new1(&line6_controls[i], line6pcm));
 553                 if (err < 0)
 554                         return err;
 555         }
 556
 557         return 0;
 558 }
 559 EXPORT_SYMBOL_GPL(line6_init_pcm);
 560
 561 /* prepare pcm callback */
 562 int snd_line6_prepare(struct snd_pcm_substream *substream)
 563 {
 564         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 565         struct line6_pcm_stream *pstr = get_stream(line6pcm, substream->stream);
 566
 567         mutex_lock(&line6pcm->state_mutex);
 568         if (!pstr->running)
 569                 line6_wait_clear_audio_urbs(line6pcm, pstr);
 570
 571         if (!test_and_set_bit(LINE6_FLAG_PREPARED, &line6pcm->flags)) {
 572                 line6pcm->out.count = 0;
 573                 line6pcm->out.pos = 0;
 574                 line6pcm->out.pos_done = 0;
 575                 line6pcm->out.bytes = 0;
 576                 line6pcm->in.count = 0;
 577                 line6pcm->in.pos_done = 0;
 578                 line6pcm->in.bytes = 0;
 579         }
 580
 581         mutex_unlock(&line6pcm->state_mutex);
 582         return 0;
 583 }