drivers/staging/line6/pcm.c

   1 /*
   2  * Line6 Linux USB driver - 0.9.1beta
   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 <sound/core.h>
  14 #include <sound/control.h>
  15 #include <sound/pcm.h>
  16 #include <sound/pcm_params.h>
  17
  18 #include "audio.h"
  19 #include "capture.h"
  20 #include "driver.h"
  21 #include "playback.h"
  22 #include "pod.h"
  23
  24 #ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE
  25
  26 static struct snd_line6_pcm *dev2pcm(struct device *dev)
  27 {
  28         struct usb_interface *interface = to_usb_interface(dev);
  29         struct usb_line6 *line6 = usb_get_intfdata(interface);
  30         struct snd_line6_pcm *line6pcm = line6->line6pcm;
  31         return line6pcm;
  32 }
  33
  34 /*
  35         "read" request on "impulse_volume" special file.
  36 */
  37 static ssize_t pcm_get_impulse_volume(struct device *dev,
  38                                       struct device_attribute *attr, char *buf)
  39 {
  40         return sprintf(buf, "%d\n", dev2pcm(dev)->impulse_volume);
  41 }
  42
  43 /*
  44         "write" request on "impulse_volume" special file.
  45 */
  46 static ssize_t pcm_set_impulse_volume(struct device *dev,
  47                                       struct device_attribute *attr,
  48                                       const char *buf, size_t count)
  49 {
  50         struct snd_line6_pcm *line6pcm = dev2pcm(dev);
  51         int value;
  52         int rv;
  53
  54         rv = kstrtoint(buf, 10, &value);
  55         if (rv < 0)
  56                 return rv;
  57
  58         line6pcm->impulse_volume = value;
  59
  60         if (value > 0)
  61                 line6_pcm_acquire(line6pcm, LINE6_BITS_PCM_IMPULSE);
  62         else
  63                 line6_pcm_release(line6pcm, LINE6_BITS_PCM_IMPULSE);
  64
  65         return count;
  66 }
  67
  68 /*
  69         "read" request on "impulse_period" special file.
  70 */
  71 static ssize_t pcm_get_impulse_period(struct device *dev,
  72                                       struct device_attribute *attr, char *buf)
  73 {
  74         return sprintf(buf, "%d\n", dev2pcm(dev)->impulse_period);
  75 }
  76
  77 /*
  78         "write" request on "impulse_period" special file.
  79 */
  80 static ssize_t pcm_set_impulse_period(struct device *dev,
  81                                       struct device_attribute *attr,
  82                                       const char *buf, size_t count)
  83 {
  84         dev2pcm(dev)->impulse_period = simple_strtoul(buf, NULL, 10);
  85         return count;
  86 }
  87
  88 static DEVICE_ATTR(impulse_volume, S_IWUSR | S_IRUGO, pcm_get_impulse_volume,
  89                    pcm_set_impulse_volume);
  90 static DEVICE_ATTR(impulse_period, S_IWUSR | S_IRUGO, pcm_get_impulse_period,
  91                    pcm_set_impulse_period);
  92
  93 #endif
  94
  95 static bool test_flags(unsigned long flags0, unsigned long flags1,
  96                        unsigned long mask)
  97 {
  98         return ((flags0 & mask) == 0) && ((flags1 & mask) != 0);
  99 }
 100
 101 int line6_pcm_acquire(struct snd_line6_pcm *line6pcm, int channels)
 102 {
 103         unsigned long flags_old =
 104             __sync_fetch_and_or(&line6pcm->flags, channels);
 105         unsigned long flags_new = flags_old | channels;
 106         unsigned long flags_final = flags_old;
 107         int err = 0;
 108
 109         line6pcm->prev_fbuf = NULL;
 110
 111         if (test_flags(flags_old, flags_new, LINE6_BITS_CAPTURE_BUFFER)) {
 112                 /* Invoked multiple times in a row so allocate once only */
 113                 if (!line6pcm->buffer_in) {
 114                         line6pcm->buffer_in =
 115                                 kmalloc(LINE6_ISO_BUFFERS * LINE6_ISO_PACKETS *
 116                                         line6pcm->max_packet_size, GFP_KERNEL);
 117
 118                         if (!line6pcm->buffer_in) {
 119                                 dev_err(line6pcm->line6->ifcdev,
 120                                         "cannot malloc capture buffer\n");
 121                                 err = -ENOMEM;
 122                                 goto pcm_acquire_error;
 123                         }
 124
 125                         flags_final |= channels & LINE6_BITS_CAPTURE_BUFFER;
 126                 }
 127         }
 128
 129         if (test_flags(flags_old, flags_new, LINE6_BITS_CAPTURE_STREAM)) {
 130                 /*
 131                    Waiting for completion of active URBs in the stop handler is
 132                    a bug, we therefore report an error if capturing is restarted
 133                    too soon.
 134                  */
 135                 if (line6pcm->active_urb_in | line6pcm->unlink_urb_in) {
 136                         dev_err(line6pcm->line6->ifcdev, "Device not yet ready\n");
 137                         return -EBUSY;
 138                 }
 139
 140                 line6pcm->count_in = 0;
 141                 line6pcm->prev_fsize = 0;
 142                 err = line6_submit_audio_in_all_urbs(line6pcm);
 143
 144                 if (err < 0)
 145                         goto pcm_acquire_error;
 146
 147                 flags_final |= channels & LINE6_BITS_CAPTURE_STREAM;
 148         }
 149
 150         if (test_flags(flags_old, flags_new, LINE6_BITS_PLAYBACK_BUFFER)) {
 151                 /* Invoked multiple times in a row so allocate once only */
 152                 if (!line6pcm->buffer_out) {
 153                         line6pcm->buffer_out =
 154                                 kmalloc(LINE6_ISO_BUFFERS * LINE6_ISO_PACKETS *
 155                                         line6pcm->max_packet_size, GFP_KERNEL);
 156
 157                         if (!line6pcm->buffer_out) {
 158                                 dev_err(line6pcm->line6->ifcdev,
 159                                         "cannot malloc playback buffer\n");
 160                                 err = -ENOMEM;
 161                                 goto pcm_acquire_error;
 162                         }
 163
 164                         flags_final |= channels & LINE6_BITS_PLAYBACK_BUFFER;
 165                 }
 166         }
 167
 168         if (test_flags(flags_old, flags_new, LINE6_BITS_PLAYBACK_STREAM)) {
 169                 /*
 170                   See comment above regarding PCM restart.
 171                 */
 172                 if (line6pcm->active_urb_out | line6pcm->unlink_urb_out) {
 173                         dev_err(line6pcm->line6->ifcdev, "Device not yet ready\n");
 174                         return -EBUSY;
 175                 }
 176
 177                 line6pcm->count_out = 0;
 178                 err = line6_submit_audio_out_all_urbs(line6pcm);
 179
 180                 if (err < 0)
 181                         goto pcm_acquire_error;
 182
 183                 flags_final |= channels & LINE6_BITS_PLAYBACK_STREAM;
 184         }
 185
 186         return 0;
 187
 188 pcm_acquire_error:
 189         /*
 190            If not all requested resources/streams could be obtained, release
 191            those which were successfully obtained (if any).
 192         */
 193         line6_pcm_release(line6pcm, flags_final & channels);
 194         return err;
 195 }
 196
 197 int line6_pcm_release(struct snd_line6_pcm *line6pcm, int channels)
 198 {
 199         unsigned long flags_old =
 200             __sync_fetch_and_and(&line6pcm->flags, ~channels);
 201         unsigned long flags_new = flags_old & ~channels;
 202
 203         if (test_flags(flags_new, flags_old, LINE6_BITS_CAPTURE_STREAM))
 204                 line6_unlink_audio_in_urbs(line6pcm);
 205
 206         if (test_flags(flags_new, flags_old, LINE6_BITS_CAPTURE_BUFFER)) {
 207                 line6_wait_clear_audio_in_urbs(line6pcm);
 208                 line6_free_capture_buffer(line6pcm);
 209         }
 210
 211         if (test_flags(flags_new, flags_old, LINE6_BITS_PLAYBACK_STREAM))
 212                 line6_unlink_audio_out_urbs(line6pcm);
 213
 214         if (test_flags(flags_new, flags_old, LINE6_BITS_PLAYBACK_BUFFER)) {
 215                 line6_wait_clear_audio_out_urbs(line6pcm);
 216                 line6_free_playback_buffer(line6pcm);
 217         }
 218
 219         return 0;
 220 }
 221
 222 /* trigger callback */
 223 int snd_line6_trigger(struct snd_pcm_substream *substream, int cmd)
 224 {
 225         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 226         struct snd_pcm_substream *s;
 227         int err;
 228         unsigned long flags;
 229
 230         spin_lock_irqsave(&line6pcm->lock_trigger, flags);
 231         clear_bit(LINE6_INDEX_PREPARED, &line6pcm->flags);
 232
 233         snd_pcm_group_for_each_entry(s, substream) {
 234                 switch (s->stream) {
 235                 case SNDRV_PCM_STREAM_PLAYBACK:
 236                         err = snd_line6_playback_trigger(line6pcm, cmd);
 237
 238                         if (err < 0) {
 239                                 spin_unlock_irqrestore(&line6pcm->lock_trigger,
 240                                                        flags);
 241                                 return err;
 242                         }
 243
 244                         break;
 245
 246                 case SNDRV_PCM_STREAM_CAPTURE:
 247                         err = snd_line6_capture_trigger(line6pcm, cmd);
 248
 249                         if (err < 0) {
 250                                 spin_unlock_irqrestore(&line6pcm->lock_trigger,
 251                                                        flags);
 252                                 return err;
 253                         }
 254
 255                         break;
 256
 257                 default:
 258                         dev_err(line6pcm->line6->ifcdev,
 259                                 "Unknown stream direction %d\n", s->stream);
 260                 }
 261         }
 262
 263         spin_unlock_irqrestore(&line6pcm->lock_trigger, flags);
 264         return 0;
 265 }
 266
 267 /* control info callback */
 268 static int snd_line6_control_playback_info(struct snd_kcontrol *kcontrol,
 269                                            struct snd_ctl_elem_info *uinfo)
 270 {
 271         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 272         uinfo->count = 2;
 273         uinfo->value.integer.min = 0;
 274         uinfo->value.integer.max = 256;
 275         return 0;
 276 }
 277
 278 /* control get callback */
 279 static int snd_line6_control_playback_get(struct snd_kcontrol *kcontrol,
 280                                           struct snd_ctl_elem_value *ucontrol)
 281 {
 282         int i;
 283         struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);
 284
 285         for (i = 2; i--;)
 286                 ucontrol->value.integer.value[i] = line6pcm->volume_playback[i];
 287
 288         return 0;
 289 }
 290
 291 /* control put callback */
 292 static int snd_line6_control_playback_put(struct snd_kcontrol *kcontrol,
 293                                           struct snd_ctl_elem_value *ucontrol)
 294 {
 295         int i, changed = 0;
 296         struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);
 297
 298         for (i = 2; i--;)
 299                 if (line6pcm->volume_playback[i] !=
 300                     ucontrol->value.integer.value[i]) {
 301                         line6pcm->volume_playback[i] =
 302                             ucontrol->value.integer.value[i];
 303                         changed = 1;
 304                 }
 305
 306         return changed;
 307 }
 308
 309 /* control definition */
 310 static struct snd_kcontrol_new line6_control_playback = {
 311         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 312         .name = "PCM Playback Volume",
 313         .index = 0,
 314         .access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
 315         .info = snd_line6_control_playback_info,
 316         .get = snd_line6_control_playback_get,
 317         .put = snd_line6_control_playback_put
 318 };
 319
 320 /*
 321         Cleanup the PCM device.
 322 */
 323 static void line6_cleanup_pcm(struct snd_pcm *pcm)
 324 {
 325         int i;
 326         struct snd_line6_pcm *line6pcm = snd_pcm_chip(pcm);
 327
 328 #ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE
 329         device_remove_file(line6pcm->line6->ifcdev, &dev_attr_impulse_volume);
 330         device_remove_file(line6pcm->line6->ifcdev, &dev_attr_impulse_period);
 331 #endif
 332
 333         for (i = LINE6_ISO_BUFFERS; i--;) {
 334                 if (line6pcm->urb_audio_out[i]) {
 335                         usb_kill_urb(line6pcm->urb_audio_out[i]);
 336                         usb_free_urb(line6pcm->urb_audio_out[i]);
 337                 }
 338                 if (line6pcm->urb_audio_in[i]) {
 339                         usb_kill_urb(line6pcm->urb_audio_in[i]);
 340                         usb_free_urb(line6pcm->urb_audio_in[i]);
 341                 }
 342         }
 343 }
 344
 345 /* create a PCM device */
 346 static int snd_line6_new_pcm(struct snd_line6_pcm *line6pcm)
 347 {
 348         struct snd_pcm *pcm;
 349         int err;
 350
 351         err = snd_pcm_new(line6pcm->line6->card,
 352                           (char *)line6pcm->line6->properties->name,
 353                           0, 1, 1, &pcm);
 354         if (err < 0)
 355                 return err;
 356
 357         pcm->private_data = line6pcm;
 358         pcm->private_free = line6_cleanup_pcm;
 359         line6pcm->pcm = pcm;
 360         strcpy(pcm->name, line6pcm->line6->properties->name);
 361
 362         /* set operators */
 363         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
 364                         &snd_line6_playback_ops);
 365         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_line6_capture_ops);
 366
 367         /* pre-allocation of buffers */
 368         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
 369                                               snd_dma_continuous_data
 370                                               (GFP_KERNEL), 64 * 1024,
 371                                               128 * 1024);
 372
 373         return 0;
 374 }
 375
 376 /* PCM device destructor */
 377 static int snd_line6_pcm_free(struct snd_device *device)
 378 {
 379         return 0;
 380 }
 381
 382 /*
 383         Stop substream if still running.
 384 */
 385 static void pcm_disconnect_substream(struct snd_pcm_substream *substream)
 386 {
 387         if (substream->runtime && snd_pcm_running(substream))
 388                 snd_pcm_stop(substream, SNDRV_PCM_STATE_DISCONNECTED);
 389 }
 390
 391 /*
 392         Stop PCM stream.
 393 */
 394 void line6_pcm_disconnect(struct snd_line6_pcm *line6pcm)
 395 {
 396         pcm_disconnect_substream(get_substream
 397                                  (line6pcm, SNDRV_PCM_STREAM_CAPTURE));
 398         pcm_disconnect_substream(get_substream
 399                                  (line6pcm, SNDRV_PCM_STREAM_PLAYBACK));
 400         line6_unlink_wait_clear_audio_out_urbs(line6pcm);
 401         line6_unlink_wait_clear_audio_in_urbs(line6pcm);
 402 }
 403
 404 /*
 405         Create and register the PCM device and mixer entries.
 406         Create URBs for playback and capture.
 407 */
 408 int line6_init_pcm(struct usb_line6 *line6,
 409                    struct line6_pcm_properties *properties)
 410 {
 411         static struct snd_device_ops pcm_ops = {
 412                 .dev_free = snd_line6_pcm_free,
 413         };
 414
 415         int err;
 416         int ep_read = 0, ep_write = 0;
 417         struct snd_line6_pcm *line6pcm;
 418
 419         if (!(line6->properties->capabilities & LINE6_BIT_PCM))
 420                 return 0;       /* skip PCM initialization and report success */
 421
 422         /* initialize PCM subsystem based on product id: */
 423         switch (line6->product) {
 424         case LINE6_DEVID_BASSPODXT:
 425         case LINE6_DEVID_BASSPODXTLIVE:
 426         case LINE6_DEVID_BASSPODXTPRO:
 427         case LINE6_DEVID_PODXT:
 428         case LINE6_DEVID_PODXTLIVE:
 429         case LINE6_DEVID_PODXTPRO:
 430         case LINE6_DEVID_PODHD300:
 431                 ep_read = 0x82;
 432                 ep_write = 0x01;
 433                 break;
 434
 435         case LINE6_DEVID_PODHD500:
 436         case LINE6_DEVID_PODX3:
 437         case LINE6_DEVID_PODX3LIVE:
 438                 ep_read = 0x86;
 439                 ep_write = 0x02;
 440                 break;
 441
 442         case LINE6_DEVID_POCKETPOD:
 443                 ep_read = 0x82;
 444                 ep_write = 0x02;
 445                 break;
 446
 447         case LINE6_DEVID_GUITARPORT:
 448         case LINE6_DEVID_PODSTUDIO_GX:
 449         case LINE6_DEVID_PODSTUDIO_UX1:
 450         case LINE6_DEVID_PODSTUDIO_UX2:
 451         case LINE6_DEVID_TONEPORT_GX:
 452         case LINE6_DEVID_TONEPORT_UX1:
 453         case LINE6_DEVID_TONEPORT_UX2:
 454                 ep_read = 0x82;
 455                 ep_write = 0x01;
 456                 break;
 457
 458                 /* this is for interface_number == 1:
 459                    case LINE6_DEVID_TONEPORT_UX2:
 460                    case LINE6_DEVID_PODSTUDIO_UX2:
 461                    ep_read  = 0x87;
 462                    ep_write = 0x00;
 463                    break;
 464                  */
 465
 466         default:
 467                 MISSING_CASE;
 468         }
 469
 470         line6pcm = kzalloc(sizeof(struct snd_line6_pcm), GFP_KERNEL);
 471
 472         if (line6pcm == NULL)
 473                 return -ENOMEM;
 474
 475         line6pcm->volume_playback[0] = line6pcm->volume_playback[1] = 255;
 476         line6pcm->volume_monitor = 255;
 477         line6pcm->line6 = line6;
 478         line6pcm->ep_audio_read = ep_read;
 479         line6pcm->ep_audio_write = ep_write;
 480
 481         /* Read and write buffers are sized identically, so choose minimum */
 482         line6pcm->max_packet_size = min(
 483                         usb_maxpacket(line6->usbdev,
 484                                 usb_rcvisocpipe(line6->usbdev, ep_read), 0),
 485                         usb_maxpacket(line6->usbdev,
 486                                 usb_sndisocpipe(line6->usbdev, ep_write), 1));
 487
 488         line6pcm->properties = properties;
 489         line6->line6pcm = line6pcm;
 490
 491         /* PCM device: */
 492         err = snd_device_new(line6->card, SNDRV_DEV_PCM, line6, &pcm_ops);
 493         if (err < 0)
 494                 return err;
 495
 496         snd_card_set_dev(line6->card, line6->ifcdev);
 497
 498         err = snd_line6_new_pcm(line6pcm);
 499         if (err < 0)
 500                 return err;
 501
 502         spin_lock_init(&line6pcm->lock_audio_out);
 503         spin_lock_init(&line6pcm->lock_audio_in);
 504         spin_lock_init(&line6pcm->lock_trigger);
 505
 506         err = line6_create_audio_out_urbs(line6pcm);
 507         if (err < 0)
 508                 return err;
 509
 510         err = line6_create_audio_in_urbs(line6pcm);
 511         if (err < 0)
 512                 return err;
 513
 514         /* mixer: */
 515         err =
 516             snd_ctl_add(line6->card,
 517                         snd_ctl_new1(&line6_control_playback, line6pcm));
 518         if (err < 0)
 519                 return err;
 520
 521 #ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE
 522         /* impulse response test: */
 523         err = device_create_file(line6->ifcdev, &dev_attr_impulse_volume);
 524         if (err < 0)
 525                 return err;
 526
 527         err = device_create_file(line6->ifcdev, &dev_attr_impulse_period);
 528         if (err < 0)
 529                 return err;
 530
 531         line6pcm->impulse_period = LINE6_IMPULSE_DEFAULT_PERIOD;
 532 #endif
 533
 534         return 0;
 535 }
 536
 537 /* prepare pcm callback */
 538 int snd_line6_prepare(struct snd_pcm_substream *substream)
 539 {
 540         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 541
 542         switch (substream->stream) {
 543         case SNDRV_PCM_STREAM_PLAYBACK:
 544                 if ((line6pcm->flags & LINE6_BITS_PLAYBACK_STREAM) == 0)
 545                         line6_unlink_wait_clear_audio_out_urbs(line6pcm);
 546
 547                 break;
 548
 549         case SNDRV_PCM_STREAM_CAPTURE:
 550                 if ((line6pcm->flags & LINE6_BITS_CAPTURE_STREAM) == 0)
 551                         line6_unlink_wait_clear_audio_in_urbs(line6pcm);
 552
 553                 break;
 554
 555         default:
 556                 MISSING_CASE;
 557         }
 558
 559         if (!test_and_set_bit(LINE6_INDEX_PREPARED, &line6pcm->flags)) {
 560                 line6pcm->count_out = 0;
 561                 line6pcm->pos_out = 0;
 562                 line6pcm->pos_out_done = 0;
 563                 line6pcm->bytes_out = 0;
 564                 line6pcm->count_in = 0;
 565                 line6pcm->pos_in_done = 0;
 566                 line6pcm->bytes_in = 0;
 567         }
 568
 569         return 0;
 570 }