drivers/staging/line6/playback.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/pcm.h>
  15 #include <sound/pcm_params.h>
  16
  17 #include "audio.h"
  18 #include "capture.h"
  19 #include "driver.h"
  20 #include "pcm.h"
  21 #include "pod.h"
  22 #include "playback.h"
  23
  24 /*
  25         Software stereo volume control.
  26 */
  27 static void change_volume(struct urb *urb_out, int volume[],
  28                           int bytes_per_frame)
  29 {
  30         int chn = 0;
  31
  32         if (volume[0] == 256 && volume[1] == 256)
  33                 return;         /* maximum volume - no change */
  34
  35         if (bytes_per_frame == 4) {
  36                 short *p, *buf_end;
  37                 p = (short *)urb_out->transfer_buffer;
  38                 buf_end = p + urb_out->transfer_buffer_length / sizeof(*p);
  39
  40                 for (; p < buf_end; ++p) {
  41                         *p = (*p * volume[chn & 1]) >> 8;
  42                         ++chn;
  43                 }
  44         } else if (bytes_per_frame == 6) {
  45                 unsigned char *p, *buf_end;
  46                 p = (unsigned char *)urb_out->transfer_buffer;
  47                 buf_end = p + urb_out->transfer_buffer_length;
  48
  49                 for (; p < buf_end; p += 3) {
  50                         int val;
  51                         val = p[0] + (p[1] << 8) + ((signed char)p[2] << 16);
  52                         val = (val * volume[chn & 1]) >> 8;
  53                         p[0] = val;
  54                         p[1] = val >> 8;
  55                         p[2] = val >> 16;
  56                         ++chn;
  57                 }
  58         }
  59 }
  60
  61 #ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE
  62
  63 /*
  64         Create signal for impulse response test.
  65 */
  66 static void create_impulse_test_signal(struct snd_line6_pcm *line6pcm,
  67                                        struct urb *urb_out, int bytes_per_frame)
  68 {
  69         int frames = urb_out->transfer_buffer_length / bytes_per_frame;
  70
  71         if (bytes_per_frame == 4) {
  72                 int i;
  73                 short *pi = (short *)line6pcm->prev_fbuf;
  74                 short *po = (short *)urb_out->transfer_buffer;
  75
  76                 for (i = 0; i < frames; ++i) {
  77                         po[0] = pi[0];
  78                         po[1] = 0;
  79                         pi += 2;
  80                         po += 2;
  81                 }
  82         } else if (bytes_per_frame == 6) {
  83                 int i, j;
  84                 unsigned char *pi = line6pcm->prev_fbuf;
  85                 unsigned char *po = urb_out->transfer_buffer;
  86
  87                 for (i = 0; i < frames; ++i) {
  88                         for (j = 0; j < bytes_per_frame / 2; ++j)
  89                                 po[j] = pi[j];
  90
  91                         for (; j < bytes_per_frame; ++j)
  92                                 po[j] = 0;
  93
  94                         pi += bytes_per_frame;
  95                         po += bytes_per_frame;
  96                 }
  97         }
  98         if (--line6pcm->impulse_count <= 0) {
  99                 ((unsigned char *)(urb_out->transfer_buffer))[bytes_per_frame -
 100                                                               1] =
 101                     line6pcm->impulse_volume;
 102                 line6pcm->impulse_count = line6pcm->impulse_period;
 103         }
 104 }
 105
 106 #endif
 107
 108 /*
 109         Add signal to buffer for software monitoring.
 110 */
 111 static void add_monitor_signal(struct urb *urb_out, unsigned char *signal,
 112                                int volume, int bytes_per_frame)
 113 {
 114         if (volume == 0)
 115                 return;         /* zero volume - no change */
 116
 117         if (bytes_per_frame == 4) {
 118                 short *pi, *po, *buf_end;
 119                 pi = (short *)signal;
 120                 po = (short *)urb_out->transfer_buffer;
 121                 buf_end = po + urb_out->transfer_buffer_length / sizeof(*po);
 122
 123                 for (; po < buf_end; ++pi, ++po)
 124                         *po += (*pi * volume) >> 8;
 125         }
 126
 127         /*
 128            We don't need to handle devices with 6 bytes per frame here
 129            since they all support hardware monitoring.
 130          */
 131 }
 132
 133 /*
 134         Find a free URB, prepare audio data, and submit URB.
 135 */
 136 static int submit_audio_out_urb(struct snd_line6_pcm *line6pcm)
 137 {
 138         int index;
 139         unsigned long flags;
 140         int i, urb_size, urb_frames;
 141         int ret;
 142         const int bytes_per_frame = line6pcm->properties->bytes_per_frame;
 143         const int frame_increment =
 144             line6pcm->properties->snd_line6_rates.rats[0].num_min;
 145         const int frame_factor =
 146             line6pcm->properties->snd_line6_rates.rats[0].den *
 147             (USB_INTERVALS_PER_SECOND / LINE6_ISO_INTERVAL);
 148         struct urb *urb_out;
 149
 150         spin_lock_irqsave(&line6pcm->lock_audio_out, flags);
 151         index =
 152             find_first_zero_bit(&line6pcm->active_urb_out, LINE6_ISO_BUFFERS);
 153
 154         if (index < 0 || index >= LINE6_ISO_BUFFERS) {
 155                 spin_unlock_irqrestore(&line6pcm->lock_audio_out, flags);
 156                 dev_err(line6pcm->line6->ifcdev, "no free URB found\n");
 157                 return -EINVAL;
 158         }
 159
 160         urb_out = line6pcm->urb_audio_out[index];
 161         urb_size = 0;
 162
 163         for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
 164                 /* compute frame size for given sampling rate */
 165                 int fsize = 0;
 166                 struct usb_iso_packet_descriptor *fout =
 167                     &urb_out->iso_frame_desc[i];
 168
 169                 if (line6pcm->flags & LINE6_BITS_CAPTURE_STREAM)
 170                         fsize = line6pcm->prev_fsize;
 171
 172                 if (fsize == 0) {
 173                         int n;
 174                         line6pcm->count_out += frame_increment;
 175                         n = line6pcm->count_out / frame_factor;
 176                         line6pcm->count_out -= n * frame_factor;
 177                         fsize = n * bytes_per_frame;
 178                 }
 179
 180                 fout->offset = urb_size;
 181                 fout->length = fsize;
 182                 urb_size += fsize;
 183         }
 184
 185         if (urb_size == 0) {
 186                 /* can't determine URB size */
 187                 spin_unlock_irqrestore(&line6pcm->lock_audio_out, flags);
 188                 dev_err(line6pcm->line6->ifcdev, "driver bug: urb_size = 0\n");
 189                 return -EINVAL;
 190         }
 191
 192         urb_frames = urb_size / bytes_per_frame;
 193         urb_out->transfer_buffer =
 194             line6pcm->buffer_out +
 195             index * LINE6_ISO_PACKETS * line6pcm->max_packet_size;
 196         urb_out->transfer_buffer_length = urb_size;
 197         urb_out->context = line6pcm;
 198
 199         if (test_bit(LINE6_INDEX_PCM_ALSA_PLAYBACK_STREAM, &line6pcm->flags) &&
 200             !test_bit(LINE6_INDEX_PAUSE_PLAYBACK, &line6pcm->flags)) {
 201                 struct snd_pcm_runtime *runtime =
 202                     get_substream(line6pcm, SNDRV_PCM_STREAM_PLAYBACK)->runtime;
 203
 204                 if (line6pcm->pos_out + urb_frames > runtime->buffer_size) {
 205                         /*
 206                            The transferred area goes over buffer boundary,
 207                            copy the data to the temp buffer.
 208                          */
 209                         int len;
 210                         len = runtime->buffer_size - line6pcm->pos_out;
 211
 212                         if (len > 0) {
 213                                 memcpy(urb_out->transfer_buffer,
 214                                        runtime->dma_area +
 215                                        line6pcm->pos_out * bytes_per_frame,
 216                                        len * bytes_per_frame);
 217                                 memcpy(urb_out->transfer_buffer +
 218                                        len * bytes_per_frame, runtime->dma_area,
 219                                        (urb_frames - len) * bytes_per_frame);
 220                         } else
 221                                 dev_err(line6pcm->line6->ifcdev, "driver bug: len = %d\n",
 222                                         len);
 223                 } else {
 224                         memcpy(urb_out->transfer_buffer,
 225                                runtime->dma_area +
 226                                line6pcm->pos_out * bytes_per_frame,
 227                                urb_out->transfer_buffer_length);
 228                 }
 229
 230                 line6pcm->pos_out += urb_frames;
 231                 if (line6pcm->pos_out >= runtime->buffer_size)
 232                         line6pcm->pos_out -= runtime->buffer_size;
 233         } else {
 234                 memset(urb_out->transfer_buffer, 0,
 235                        urb_out->transfer_buffer_length);
 236         }
 237
 238         change_volume(urb_out, line6pcm->volume_playback, bytes_per_frame);
 239
 240         if (line6pcm->prev_fbuf != NULL) {
 241 #ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE
 242                 if (line6pcm->flags & LINE6_BITS_PCM_IMPULSE) {
 243                         create_impulse_test_signal(line6pcm, urb_out,
 244                                                    bytes_per_frame);
 245                         if (line6pcm->flags &
 246                             LINE6_BIT_PCM_ALSA_CAPTURE_STREAM) {
 247                                 line6_capture_copy(line6pcm,
 248                                                    urb_out->transfer_buffer,
 249                                                    urb_out->
 250                                                    transfer_buffer_length);
 251                                 line6_capture_check_period(line6pcm,
 252                                         urb_out->transfer_buffer_length);
 253                         }
 254                 } else {
 255 #endif
 256                         if (!
 257                             (line6pcm->line6->
 258                              properties->capabilities & LINE6_BIT_HWMON)
 259                             && (line6pcm->flags & LINE6_BITS_PLAYBACK_STREAM)
 260                             && (line6pcm->flags & LINE6_BITS_CAPTURE_STREAM))
 261                                 add_monitor_signal(urb_out, line6pcm->prev_fbuf,
 262                                                    line6pcm->volume_monitor,
 263                                                    bytes_per_frame);
 264 #ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE
 265                 }
 266 #endif
 267         }
 268
 269         ret = usb_submit_urb(urb_out, GFP_ATOMIC);
 270
 271         if (ret == 0)
 272                 set_bit(index, &line6pcm->active_urb_out);
 273         else
 274                 dev_err(line6pcm->line6->ifcdev,
 275                         "URB out #%d submission failed (%d)\n", index, ret);
 276
 277         spin_unlock_irqrestore(&line6pcm->lock_audio_out, flags);
 278         return 0;
 279 }
 280
 281 /*
 282         Submit all currently available playback URBs.
 283 */
 284 int line6_submit_audio_out_all_urbs(struct snd_line6_pcm *line6pcm)
 285 {
 286         int ret, i;
 287
 288         for (i = 0; i < LINE6_ISO_BUFFERS; ++i) {
 289                 ret = submit_audio_out_urb(line6pcm);
 290                 if (ret < 0)
 291                         return ret;
 292         }
 293
 294         return 0;
 295 }
 296
 297 /*
 298         Unlink all currently active playback URBs.
 299 */
 300 void line6_unlink_audio_out_urbs(struct snd_line6_pcm *line6pcm)
 301 {
 302         unsigned int i;
 303
 304         for (i = LINE6_ISO_BUFFERS; i--;) {
 305                 if (test_bit(i, &line6pcm->active_urb_out)) {
 306                         if (!test_and_set_bit(i, &line6pcm->unlink_urb_out)) {
 307                                 struct urb *u = line6pcm->urb_audio_out[i];
 308                                 usb_unlink_urb(u);
 309                         }
 310                 }
 311         }
 312 }
 313
 314 /*
 315         Wait until unlinking of all currently active playback URBs has been
 316         finished.
 317 */
 318 void line6_wait_clear_audio_out_urbs(struct snd_line6_pcm *line6pcm)
 319 {
 320         int timeout = HZ;
 321         unsigned int i;
 322         int alive;
 323
 324         do {
 325                 alive = 0;
 326                 for (i = LINE6_ISO_BUFFERS; i--;) {
 327                         if (test_bit(i, &line6pcm->active_urb_out))
 328                                 alive++;
 329                 }
 330                 if (!alive)
 331                         break;
 332                 set_current_state(TASK_UNINTERRUPTIBLE);
 333                 schedule_timeout(1);
 334         } while (--timeout > 0);
 335         if (alive)
 336                 snd_printk(KERN_ERR "timeout: still %d active urbs..\n", alive);
 337 }
 338
 339 /*
 340         Unlink all currently active playback URBs, and wait for finishing.
 341 */
 342 void line6_unlink_wait_clear_audio_out_urbs(struct snd_line6_pcm *line6pcm)
 343 {
 344         line6_unlink_audio_out_urbs(line6pcm);
 345         line6_wait_clear_audio_out_urbs(line6pcm);
 346 }
 347
 348 void line6_free_playback_buffer(struct snd_line6_pcm *line6pcm)
 349 {
 350         kfree(line6pcm->buffer_out);
 351         line6pcm->buffer_out = NULL;
 352 }
 353
 354 /*
 355         Callback for completed playback URB.
 356 */
 357 static void audio_out_callback(struct urb *urb)
 358 {
 359         int i, index, length = 0, shutdown = 0;
 360         unsigned long flags;
 361
 362         struct snd_line6_pcm *line6pcm = (struct snd_line6_pcm *)urb->context;
 363         struct snd_pcm_substream *substream =
 364             get_substream(line6pcm, SNDRV_PCM_STREAM_PLAYBACK);
 365
 366 #if USE_CLEAR_BUFFER_WORKAROUND
 367         memset(urb->transfer_buffer, 0, urb->transfer_buffer_length);
 368 #endif
 369
 370         line6pcm->last_frame_out = urb->start_frame;
 371
 372         /* find index of URB */
 373         for (index = LINE6_ISO_BUFFERS; index--;)
 374                 if (urb == line6pcm->urb_audio_out[index])
 375                         break;
 376
 377         if (index < 0)
 378                 return;         /* URB has been unlinked asynchronously */
 379
 380         for (i = LINE6_ISO_PACKETS; i--;)
 381                 length += urb->iso_frame_desc[i].length;
 382
 383         spin_lock_irqsave(&line6pcm->lock_audio_out, flags);
 384
 385         if (test_bit(LINE6_INDEX_PCM_ALSA_PLAYBACK_STREAM, &line6pcm->flags)) {
 386                 struct snd_pcm_runtime *runtime = substream->runtime;
 387                 line6pcm->pos_out_done +=
 388                     length / line6pcm->properties->bytes_per_frame;
 389
 390                 if (line6pcm->pos_out_done >= runtime->buffer_size)
 391                         line6pcm->pos_out_done -= runtime->buffer_size;
 392         }
 393
 394         clear_bit(index, &line6pcm->active_urb_out);
 395
 396         for (i = LINE6_ISO_PACKETS; i--;)
 397                 if (urb->iso_frame_desc[i].status == -EXDEV) {
 398                         shutdown = 1;
 399                         break;
 400                 }
 401
 402         if (test_and_clear_bit(index, &line6pcm->unlink_urb_out))
 403                 shutdown = 1;
 404
 405         spin_unlock_irqrestore(&line6pcm->lock_audio_out, flags);
 406
 407         if (!shutdown) {
 408                 submit_audio_out_urb(line6pcm);
 409
 410                 if (test_bit(LINE6_INDEX_PCM_ALSA_PLAYBACK_STREAM,
 411                              &line6pcm->flags)) {
 412                         line6pcm->bytes_out += length;
 413                         if (line6pcm->bytes_out >= line6pcm->period_out) {
 414                                 line6pcm->bytes_out %= line6pcm->period_out;
 415                                 snd_pcm_period_elapsed(substream);
 416                         }
 417                 }
 418         }
 419 }
 420
 421 /* open playback callback */
 422 static int snd_line6_playback_open(struct snd_pcm_substream *substream)
 423 {
 424         int err;
 425         struct snd_pcm_runtime *runtime = substream->runtime;
 426         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 427
 428         err = snd_pcm_hw_constraint_ratdens(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 429                                             (&line6pcm->
 430                                              properties->snd_line6_rates));
 431         if (err < 0)
 432                 return err;
 433
 434         runtime->hw = line6pcm->properties->snd_line6_playback_hw;
 435         return 0;
 436 }
 437
 438 /* close playback callback */
 439 static int snd_line6_playback_close(struct snd_pcm_substream *substream)
 440 {
 441         return 0;
 442 }
 443
 444 /* hw_params playback callback */
 445 static int snd_line6_playback_hw_params(struct snd_pcm_substream *substream,
 446                                         struct snd_pcm_hw_params *hw_params)
 447 {
 448         int ret;
 449         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 450
 451         /* -- Florian Demski [FD] */
 452         /* don't ask me why, but this fixes the bug on my machine */
 453         if (line6pcm == NULL) {
 454                 if (substream->pcm == NULL)
 455                         return -ENOMEM;
 456                 if (substream->pcm->private_data == NULL)
 457                         return -ENOMEM;
 458                 substream->private_data = substream->pcm->private_data;
 459                 line6pcm = snd_pcm_substream_chip(substream);
 460         }
 461         /* -- [FD] end */
 462
 463         ret = line6_pcm_acquire(line6pcm, LINE6_BIT_PCM_ALSA_PLAYBACK_BUFFER);
 464
 465         if (ret < 0)
 466                 return ret;
 467
 468         ret = snd_pcm_lib_malloc_pages(substream,
 469                                        params_buffer_bytes(hw_params));
 470         if (ret < 0) {
 471                 line6_pcm_release(line6pcm, LINE6_BIT_PCM_ALSA_PLAYBACK_BUFFER);
 472                 return ret;
 473         }
 474
 475         line6pcm->period_out = params_period_bytes(hw_params);
 476         return 0;
 477 }
 478
 479 /* hw_free playback callback */
 480 static int snd_line6_playback_hw_free(struct snd_pcm_substream *substream)
 481 {
 482         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 483         line6_pcm_release(line6pcm, LINE6_BIT_PCM_ALSA_PLAYBACK_BUFFER);
 484         return snd_pcm_lib_free_pages(substream);
 485 }
 486
 487 /* trigger playback callback */
 488 int snd_line6_playback_trigger(struct snd_line6_pcm *line6pcm, int cmd)
 489 {
 490         int err;
 491
 492         switch (cmd) {
 493         case SNDRV_PCM_TRIGGER_START:
 494 #ifdef CONFIG_PM
 495         case SNDRV_PCM_TRIGGER_RESUME:
 496 #endif
 497                 err = line6_pcm_acquire(line6pcm,
 498                                         LINE6_BIT_PCM_ALSA_PLAYBACK_STREAM);
 499
 500                 if (err < 0)
 501                         return err;
 502
 503                 break;
 504
 505         case SNDRV_PCM_TRIGGER_STOP:
 506 #ifdef CONFIG_PM
 507         case SNDRV_PCM_TRIGGER_SUSPEND:
 508 #endif
 509                 err = line6_pcm_release(line6pcm,
 510                                         LINE6_BIT_PCM_ALSA_PLAYBACK_STREAM);
 511
 512                 if (err < 0)
 513                         return err;
 514
 515                 break;
 516
 517         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 518                 set_bit(LINE6_INDEX_PAUSE_PLAYBACK, &line6pcm->flags);
 519                 break;
 520
 521         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 522                 clear_bit(LINE6_INDEX_PAUSE_PLAYBACK, &line6pcm->flags);
 523                 break;
 524
 525         default:
 526                 return -EINVAL;
 527         }
 528
 529         return 0;
 530 }
 531
 532 /* playback pointer callback */
 533 static snd_pcm_uframes_t
 534 snd_line6_playback_pointer(struct snd_pcm_substream *substream)
 535 {
 536         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 537         return line6pcm->pos_out_done;
 538 }
 539
 540 /* playback operators */
 541 struct snd_pcm_ops snd_line6_playback_ops = {
 542         .open = snd_line6_playback_open,
 543         .close = snd_line6_playback_close,
 544         .ioctl = snd_pcm_lib_ioctl,
 545         .hw_params = snd_line6_playback_hw_params,
 546         .hw_free = snd_line6_playback_hw_free,
 547         .prepare = snd_line6_prepare,
 548         .trigger = snd_line6_trigger,
 549         .pointer = snd_line6_playback_pointer,
 550 };
 551
 552 int line6_create_audio_out_urbs(struct snd_line6_pcm *line6pcm)
 553 {
 554         int i;
 555
 556         /* create audio URBs and fill in constant values: */
 557         for (i = 0; i < LINE6_ISO_BUFFERS; ++i) {
 558                 struct urb *urb;
 559
 560                 /* URB for audio out: */
 561                 urb = line6pcm->urb_audio_out[i] =
 562                     usb_alloc_urb(LINE6_ISO_PACKETS, GFP_KERNEL);
 563
 564                 if (urb == NULL) {
 565                         dev_err(line6pcm->line6->ifcdev, "Out of memory\n");
 566                         return -ENOMEM;
 567                 }
 568
 569                 urb->dev = line6pcm->line6->usbdev;
 570                 urb->pipe =
 571                     usb_sndisocpipe(line6pcm->line6->usbdev,
 572                                     line6pcm->ep_audio_write &
 573                                     USB_ENDPOINT_NUMBER_MASK);
 574                 urb->transfer_flags = URB_ISO_ASAP;
 575                 urb->start_frame = -1;
 576                 urb->number_of_packets = LINE6_ISO_PACKETS;
 577                 urb->interval = LINE6_ISO_INTERVAL;
 578                 urb->error_count = 0;
 579                 urb->complete = audio_out_callback;
 580         }
 581
 582         return 0;
 583 }