sound/usb/usx2y/usx2yhwdeppcm.c

   1 /*
   2  *   This program is free software; you can redistribute it and/or modify
   3  *   it under the terms of the GNU General Public License as published by
   4  *   the Free Software Foundation; either version 2 of the License, or
   5  *   (at your option) any later version.
   6  *
   7  *   This program is distributed in the hope that it will be useful,
   8  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  *   GNU General Public License for more details.
  11  *
  12  *   You should have received a copy of the GNU General Public License
  13  *   along with this program; if not, write to the Free Software
  14  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  15  */
  16
  17 /* USX2Y "rawusb" aka hwdep_pcm implementation
  18
  19  Its usb's unableness to atomically handle power of 2 period sized data chuncs
  20  at standard samplerates,
  21  what led to this part of the usx2y module:
  22  It provides the alsa kernel half of the usx2y-alsa-jack driver pair.
  23  The pair uses a hardware dependent alsa-device for mmaped pcm transport.
  24  Advantage achieved:
  25          The usb_hc moves pcm data from/into memory via DMA.
  26          That memory is mmaped by jack's usx2y driver.
  27          Jack's usx2y driver is the first/last to read/write pcm data.
  28          Read/write is a combination of power of 2 period shaping and
  29          float/int conversation.
  30          Compared to mainline alsa/jack we leave out power of 2 period shaping inside
  31          snd-usb-usx2y which needs memcpy() and additional buffers.
  32          As a side effect possible unwanted pcm-data coruption resulting of
  33          standard alsa's snd-usb-usx2y period shaping scheme falls away.
  34          Result is sane jack operation at buffering schemes down to 128frames,
  35          2 periods.
  36          plain usx2y alsa mode is able to achieve 64frames, 4periods, but only at the
  37          cost of easier triggered i.e. aeolus xruns (128 or 256frames,
  38          2periods works but is useless cause of crackling).
  39
  40  This is a first "proof of concept" implementation.
  41  Later, functionalities should migrate to more appropriate places:
  42  Userland:
  43  - The jackd could mmap its float-pcm buffers directly from alsa-lib.
  44  - alsa-lib could provide power of 2 period sized shaping combined with int/float
  45    conversation.
  46    Currently the usx2y jack driver provides above 2 services.
  47  Kernel:
  48  - rawusb dma pcm buffer transport should go to snd-usb-lib, so also snd-usb-audio
  49    devices can use it.
  50    Currently rawusb dma pcm buffer transport (this file) is only available to snd-usb-usx2y.
  51 */
  52
  53 #include <linux/delay.h>
  54 #include <linux/gfp.h>
  55 #include "usbusx2yaudio.c"
  56
  57 #if defined(USX2Y_NRPACKS_VARIABLE) || USX2Y_NRPACKS == 1
  58
  59 #include <sound/hwdep.h>
  60
  61
  62 static int usX2Y_usbpcm_urb_capt_retire(struct snd_usX2Y_substream *subs)
  63 {
  64         struct urb      *urb = subs->completed_urb;
  65         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
  66         int             i, lens = 0, hwptr_done = subs->hwptr_done;
  67         struct usX2Ydev *usX2Y = subs->usX2Y;
  68         if (0 > usX2Y->hwdep_pcm_shm->capture_iso_start) { //FIXME
  69                 int head = usX2Y->hwdep_pcm_shm->captured_iso_head + 1;
  70                 if (head >= ARRAY_SIZE(usX2Y->hwdep_pcm_shm->captured_iso))
  71                         head = 0;
  72                 usX2Y->hwdep_pcm_shm->capture_iso_start = head;
  73                 snd_printdd("cap start %i\n", head);
  74         }
  75         for (i = 0; i < nr_of_packs(); i++) {
  76                 if (urb->iso_frame_desc[i].status) { /* active? hmm, skip this */
  77                         snd_printk(KERN_ERR "active frame status %i. Most probably some hardware problem.\n", urb->iso_frame_desc[i].status);
  78                         return urb->iso_frame_desc[i].status;
  79                 }
  80                 lens += urb->iso_frame_desc[i].actual_length / usX2Y->stride;
  81         }
  82         if ((hwptr_done += lens) >= runtime->buffer_size)
  83                 hwptr_done -= runtime->buffer_size;
  84         subs->hwptr_done = hwptr_done;
  85         subs->transfer_done += lens;
  86         /* update the pointer, call callback if necessary */
  87         if (subs->transfer_done >= runtime->period_size) {
  88                 subs->transfer_done -= runtime->period_size;
  89                 snd_pcm_period_elapsed(subs->pcm_substream);
  90         }
  91         return 0;
  92 }
  93
  94 static inline int usX2Y_iso_frames_per_buffer(struct snd_pcm_runtime *runtime,
  95                                               struct usX2Ydev * usX2Y)
  96 {
  97         return (runtime->buffer_size * 1000) / usX2Y->rate + 1; //FIXME: so far only correct period_size == 2^x ?
  98 }
  99
 100 /*
 101  * prepare urb for playback data pipe
 102  *
 103  * we copy the data directly from the pcm buffer.
 104  * the current position to be copied is held in hwptr field.
 105  * since a urb can handle only a single linear buffer, if the total
 106  * transferred area overflows the buffer boundary, we cannot send
 107  * it directly from the buffer.  thus the data is once copied to
 108  * a temporary buffer and urb points to that.
 109  */
 110 static int usX2Y_hwdep_urb_play_prepare(struct snd_usX2Y_substream *subs,
 111                                         struct urb *urb)
 112 {
 113         int count, counts, pack;
 114         struct usX2Ydev *usX2Y = subs->usX2Y;
 115         struct snd_usX2Y_hwdep_pcm_shm *shm = usX2Y->hwdep_pcm_shm;
 116         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
 117
 118         if (0 > shm->playback_iso_start) {
 119                 shm->playback_iso_start = shm->captured_iso_head -
 120                         usX2Y_iso_frames_per_buffer(runtime, usX2Y);
 121                 if (0 > shm->playback_iso_start)
 122                         shm->playback_iso_start += ARRAY_SIZE(shm->captured_iso);
 123                 shm->playback_iso_head = shm->playback_iso_start;
 124         }
 125
 126         count = 0;
 127         for (pack = 0; pack < nr_of_packs(); pack++) {
 128                 /* calculate the size of a packet */
 129                 counts = shm->captured_iso[shm->playback_iso_head].length / usX2Y->stride;
 130                 if (counts < 43 || counts > 50) {
 131                         snd_printk(KERN_ERR "should not be here with counts=%i\n", counts);
 132                         return -EPIPE;
 133                 }
 134                 /* set up descriptor */
 135                 urb->iso_frame_desc[pack].offset = shm->captured_iso[shm->playback_iso_head].offset;
 136                 urb->iso_frame_desc[pack].length = shm->captured_iso[shm->playback_iso_head].length;
 137                 if (atomic_read(&subs->state) != state_RUNNING)
 138                         memset((char *)urb->transfer_buffer + urb->iso_frame_desc[pack].offset, 0,
 139                                urb->iso_frame_desc[pack].length);
 140                 if (++shm->playback_iso_head >= ARRAY_SIZE(shm->captured_iso))
 141                         shm->playback_iso_head = 0;
 142                 count += counts;
 143         }
 144         urb->transfer_buffer_length = count * usX2Y->stride;
 145         return 0;
 146 }
 147
 148
 149 static inline void usX2Y_usbpcm_urb_capt_iso_advance(struct snd_usX2Y_substream *subs,
 150                                                      struct urb *urb)
 151 {
 152         int pack;
 153         for (pack = 0; pack < nr_of_packs(); ++pack) {
 154                 struct usb_iso_packet_descriptor *desc = urb->iso_frame_desc + pack;
 155                 if (NULL != subs) {
 156                         struct snd_usX2Y_hwdep_pcm_shm *shm = subs->usX2Y->hwdep_pcm_shm;
 157                         int head = shm->captured_iso_head + 1;
 158                         if (head >= ARRAY_SIZE(shm->captured_iso))
 159                                 head = 0;
 160                         shm->captured_iso[head].frame = urb->start_frame + pack;
 161                         shm->captured_iso[head].offset = desc->offset;
 162                         shm->captured_iso[head].length = desc->actual_length;
 163                         shm->captured_iso_head = head;
 164                         shm->captured_iso_frames++;
 165                 }
 166                 if ((desc->offset += desc->length * NRURBS*nr_of_packs()) +
 167                     desc->length >= SSS)
 168                         desc->offset -= (SSS - desc->length);
 169         }
 170 }
 171
 172 static inline int usX2Y_usbpcm_usbframe_complete(struct snd_usX2Y_substream *capsubs,
 173                                                  struct snd_usX2Y_substream *capsubs2,
 174                                                  struct snd_usX2Y_substream *playbacksubs,
 175                                                  int frame)
 176 {
 177         int err, state;
 178         struct urb *urb = playbacksubs->completed_urb;
 179
 180         state = atomic_read(&playbacksubs->state);
 181         if (NULL != urb) {
 182                 if (state == state_RUNNING)
 183                         usX2Y_urb_play_retire(playbacksubs, urb);
 184                 else if (state >= state_PRERUNNING)
 185                         atomic_inc(&playbacksubs->state);
 186         } else {
 187                 switch (state) {
 188                 case state_STARTING1:
 189                         urb = playbacksubs->urb[0];
 190                         atomic_inc(&playbacksubs->state);
 191                         break;
 192                 case state_STARTING2:
 193                         urb = playbacksubs->urb[1];
 194                         atomic_inc(&playbacksubs->state);
 195                         break;
 196                 }
 197         }
 198         if (urb) {
 199                 if ((err = usX2Y_hwdep_urb_play_prepare(playbacksubs, urb)) ||
 200                     (err = usX2Y_urb_submit(playbacksubs, urb, frame))) {
 201                         return err;
 202                 }
 203         }
 204
 205         playbacksubs->completed_urb = NULL;
 206
 207         state = atomic_read(&capsubs->state);
 208         if (state >= state_PREPARED) {
 209                 if (state == state_RUNNING) {
 210                         if ((err = usX2Y_usbpcm_urb_capt_retire(capsubs)))
 211                                 return err;
 212                 } else if (state >= state_PRERUNNING)
 213                         atomic_inc(&capsubs->state);
 214                 usX2Y_usbpcm_urb_capt_iso_advance(capsubs, capsubs->completed_urb);
 215                 if (NULL != capsubs2)
 216                         usX2Y_usbpcm_urb_capt_iso_advance(NULL, capsubs2->completed_urb);
 217                 if ((err = usX2Y_urb_submit(capsubs, capsubs->completed_urb, frame)))
 218                         return err;
 219                 if (NULL != capsubs2)
 220                         if ((err = usX2Y_urb_submit(capsubs2, capsubs2->completed_urb, frame)))
 221                                 return err;
 222         }
 223         capsubs->completed_urb = NULL;
 224         if (NULL != capsubs2)
 225                 capsubs2->completed_urb = NULL;
 226         return 0;
 227 }
 228
 229
 230 static void i_usX2Y_usbpcm_urb_complete(struct urb *urb)
 231 {
 232         struct snd_usX2Y_substream *subs = urb->context;
 233         struct usX2Ydev *usX2Y = subs->usX2Y;
 234         struct snd_usX2Y_substream *capsubs, *capsubs2, *playbacksubs;
 235
 236         if (unlikely(atomic_read(&subs->state) < state_PREPARED)) {
 237                 snd_printdd("hcd_frame=%i ep=%i%s status=%i start_frame=%i\n",
 238                             usb_get_current_frame_number(usX2Y->dev),
 239                             subs->endpoint, usb_pipein(urb->pipe) ? "in" : "out",
 240                             urb->status, urb->start_frame);
 241                 return;
 242         }
 243         if (unlikely(urb->status)) {
 244                 usX2Y_error_urb_status(usX2Y, subs, urb);
 245                 return;
 246         }
 247
 248         subs->completed_urb = urb;
 249         capsubs = usX2Y->subs[SNDRV_PCM_STREAM_CAPTURE];
 250         capsubs2 = usX2Y->subs[SNDRV_PCM_STREAM_CAPTURE + 2];
 251         playbacksubs = usX2Y->subs[SNDRV_PCM_STREAM_PLAYBACK];
 252         if (capsubs->completed_urb && atomic_read(&capsubs->state) >= state_PREPARED &&
 253             (NULL == capsubs2 || capsubs2->completed_urb) &&
 254             (playbacksubs->completed_urb || atomic_read(&playbacksubs->state) < state_PREPARED)) {
 255                 if (!usX2Y_usbpcm_usbframe_complete(capsubs, capsubs2, playbacksubs, urb->start_frame))
 256                         usX2Y->wait_iso_frame += nr_of_packs();
 257                 else {
 258                         snd_printdd("\n");
 259                         usX2Y_clients_stop(usX2Y);
 260                 }
 261         }
 262 }
 263
 264
 265 static void usX2Y_hwdep_urb_release(struct urb **urb)
 266 {
 267         usb_kill_urb(*urb);
 268         usb_free_urb(*urb);
 269         *urb = NULL;
 270 }
 271
 272 /*
 273  * release a substream
 274  */
 275 static void usX2Y_usbpcm_urbs_release(struct snd_usX2Y_substream *subs)
 276 {
 277         int i;
 278         snd_printdd("snd_usX2Y_urbs_release() %i\n", subs->endpoint);
 279         for (i = 0; i < NRURBS; i++)
 280                 usX2Y_hwdep_urb_release(subs->urb + i);
 281 }
 282
 283 static void usX2Y_usbpcm_subs_startup_finish(struct usX2Ydev * usX2Y)
 284 {
 285         usX2Y_urbs_set_complete(usX2Y, i_usX2Y_usbpcm_urb_complete);
 286         usX2Y->prepare_subs = NULL;
 287 }
 288
 289 static void i_usX2Y_usbpcm_subs_startup(struct urb *urb)
 290 {
 291         struct snd_usX2Y_substream *subs = urb->context;
 292         struct usX2Ydev *usX2Y = subs->usX2Y;
 293         struct snd_usX2Y_substream *prepare_subs = usX2Y->prepare_subs;
 294         if (NULL != prepare_subs &&
 295             urb->start_frame == prepare_subs->urb[0]->start_frame) {
 296                 atomic_inc(&prepare_subs->state);
 297                 if (prepare_subs == usX2Y->subs[SNDRV_PCM_STREAM_CAPTURE]) {
 298                         struct snd_usX2Y_substream *cap_subs2 = usX2Y->subs[SNDRV_PCM_STREAM_CAPTURE + 2];
 299                         if (cap_subs2 != NULL)
 300                                 atomic_inc(&cap_subs2->state);
 301                 }
 302                 usX2Y_usbpcm_subs_startup_finish(usX2Y);
 303                 wake_up(&usX2Y->prepare_wait_queue);
 304         }
 305
 306         i_usX2Y_usbpcm_urb_complete(urb);
 307 }
 308
 309 /*
 310  * initialize a substream's urbs
 311  */
 312 static int usX2Y_usbpcm_urbs_allocate(struct snd_usX2Y_substream *subs)
 313 {
 314         int i;
 315         unsigned int pipe;
 316         int is_playback = subs == subs->usX2Y->subs[SNDRV_PCM_STREAM_PLAYBACK];
 317         struct usb_device *dev = subs->usX2Y->dev;
 318
 319         pipe = is_playback ? usb_sndisocpipe(dev, subs->endpoint) :
 320                         usb_rcvisocpipe(dev, subs->endpoint);
 321         subs->maxpacksize = usb_maxpacket(dev, pipe, is_playback);
 322         if (!subs->maxpacksize)
 323                 return -EINVAL;
 324
 325         /* allocate and initialize data urbs */
 326         for (i = 0; i < NRURBS; i++) {
 327                 struct urb **purb = subs->urb + i;
 328                 if (*purb) {
 329                         usb_kill_urb(*purb);
 330                         continue;
 331                 }
 332                 *purb = usb_alloc_urb(nr_of_packs(), GFP_KERNEL);
 333                 if (NULL == *purb) {
 334                         usX2Y_usbpcm_urbs_release(subs);
 335                         return -ENOMEM;
 336                 }
 337                 (*purb)->transfer_buffer = is_playback ?
 338                         subs->usX2Y->hwdep_pcm_shm->playback : (
 339                                 subs->endpoint == 0x8 ?
 340                                 subs->usX2Y->hwdep_pcm_shm->capture0x8 :
 341                                 subs->usX2Y->hwdep_pcm_shm->capture0xA);
 342
 343                 (*purb)->dev = dev;
 344                 (*purb)->pipe = pipe;
 345                 (*purb)->number_of_packets = nr_of_packs();
 346                 (*purb)->context = subs;
 347                 (*purb)->interval = 1;
 348                 (*purb)->complete = i_usX2Y_usbpcm_subs_startup;
 349         }
 350         return 0;
 351 }
 352
 353 /*
 354  * free the buffer
 355  */
 356 static int snd_usX2Y_usbpcm_hw_free(struct snd_pcm_substream *substream)
 357 {
 358         struct snd_pcm_runtime *runtime = substream->runtime;
 359         struct snd_usX2Y_substream *subs = runtime->private_data,
 360                 *cap_subs2 = subs->usX2Y->subs[SNDRV_PCM_STREAM_CAPTURE + 2];
 361         mutex_lock(&subs->usX2Y->prepare_mutex);
 362         snd_printdd("snd_usX2Y_usbpcm_hw_free(%p)\n", substream);
 363
 364         if (SNDRV_PCM_STREAM_PLAYBACK == substream->stream) {
 365                 struct snd_usX2Y_substream *cap_subs = subs->usX2Y->subs[SNDRV_PCM_STREAM_CAPTURE];
 366                 atomic_set(&subs->state, state_STOPPED);
 367                 usX2Y_usbpcm_urbs_release(subs);
 368                 if (!cap_subs->pcm_substream ||
 369                     !cap_subs->pcm_substream->runtime ||
 370                     !cap_subs->pcm_substream->runtime->status ||
 371                     cap_subs->pcm_substream->runtime->status->state < SNDRV_PCM_STATE_PREPARED) {
 372                         atomic_set(&cap_subs->state, state_STOPPED);
 373                         if (NULL != cap_subs2)
 374                                 atomic_set(&cap_subs2->state, state_STOPPED);
 375                         usX2Y_usbpcm_urbs_release(cap_subs);
 376                         if (NULL != cap_subs2)
 377                                 usX2Y_usbpcm_urbs_release(cap_subs2);
 378                 }
 379         } else {
 380                 struct snd_usX2Y_substream *playback_subs = subs->usX2Y->subs[SNDRV_PCM_STREAM_PLAYBACK];
 381                 if (atomic_read(&playback_subs->state) < state_PREPARED) {
 382                         atomic_set(&subs->state, state_STOPPED);
 383                         if (NULL != cap_subs2)
 384                                 atomic_set(&cap_subs2->state, state_STOPPED);
 385                         usX2Y_usbpcm_urbs_release(subs);
 386                         if (NULL != cap_subs2)
 387                                 usX2Y_usbpcm_urbs_release(cap_subs2);
 388                 }
 389         }
 390         mutex_unlock(&subs->usX2Y->prepare_mutex);
 391         return snd_pcm_lib_free_pages(substream);
 392 }
 393
 394 static void usX2Y_usbpcm_subs_startup(struct snd_usX2Y_substream *subs)
 395 {
 396         struct usX2Ydev * usX2Y = subs->usX2Y;
 397         usX2Y->prepare_subs = subs;
 398         subs->urb[0]->start_frame = -1;
 399         smp_wmb();      // Make sure above modifications are seen by i_usX2Y_subs_startup()
 400         usX2Y_urbs_set_complete(usX2Y, i_usX2Y_usbpcm_subs_startup);
 401 }
 402
 403 static int usX2Y_usbpcm_urbs_start(struct snd_usX2Y_substream *subs)
 404 {
 405         int     p, u, err,
 406                 stream = subs->pcm_substream->stream;
 407         struct usX2Ydev *usX2Y = subs->usX2Y;
 408
 409         if (SNDRV_PCM_STREAM_CAPTURE == stream) {
 410                 usX2Y->hwdep_pcm_shm->captured_iso_head = -1;
 411                 usX2Y->hwdep_pcm_shm->captured_iso_frames = 0;
 412         }
 413
 414         for (p = 0; 3 >= (stream + p); p += 2) {
 415                 struct snd_usX2Y_substream *subs = usX2Y->subs[stream + p];
 416                 if (subs != NULL) {
 417                         if ((err = usX2Y_usbpcm_urbs_allocate(subs)) < 0)
 418                                 return err;
 419                         subs->completed_urb = NULL;
 420                 }
 421         }
 422
 423         for (p = 0; p < 4; p++) {
 424                 struct snd_usX2Y_substream *subs = usX2Y->subs[p];
 425                 if (subs != NULL && atomic_read(&subs->state) >= state_PREPARED)
 426                         goto start;
 427         }
 428
 429  start:
 430         usX2Y_usbpcm_subs_startup(subs);
 431         for (u = 0; u < NRURBS; u++) {
 432                 for (p = 0; 3 >= (stream + p); p += 2) {
 433                         struct snd_usX2Y_substream *subs = usX2Y->subs[stream + p];
 434                         if (subs != NULL) {
 435                                 struct urb *urb = subs->urb[u];
 436                                 if (usb_pipein(urb->pipe)) {
 437                                         unsigned long pack;
 438                                         if (0 == u)
 439                                                 atomic_set(&subs->state, state_STARTING3);
 440                                         urb->dev = usX2Y->dev;
 441                                         for (pack = 0; pack < nr_of_packs(); pack++) {
 442                                                 urb->iso_frame_desc[pack].offset = subs->maxpacksize * (pack + u * nr_of_packs());
 443                                                 urb->iso_frame_desc[pack].length = subs->maxpacksize;
 444                                         }
 445                                         urb->transfer_buffer_length = subs->maxpacksize * nr_of_packs();
 446                                         if ((err = usb_submit_urb(urb, GFP_KERNEL)) < 0) {
 447                                                 snd_printk (KERN_ERR "cannot usb_submit_urb() for urb %d, err = %d\n", u, err);
 448                                                 err = -EPIPE;
 449                                                 goto cleanup;
 450                                         }  else {
 451                                                 snd_printdd("%i\n", urb->start_frame);
 452                                                 if (u == 0)
 453                                                         usX2Y->wait_iso_frame = urb->start_frame;
 454                                         }
 455                                         urb->transfer_flags = 0;
 456                                 } else {
 457                                         atomic_set(&subs->state, state_STARTING1);
 458                                         break;
 459                                 }
 460                         }
 461                 }
 462         }
 463         err = 0;
 464         wait_event(usX2Y->prepare_wait_queue, NULL == usX2Y->prepare_subs);
 465         if (atomic_read(&subs->state) != state_PREPARED)
 466                 err = -EPIPE;
 467
 468  cleanup:
 469         if (err) {
 470                 usX2Y_subs_startup_finish(usX2Y);       // Call it now
 471                 usX2Y_clients_stop(usX2Y);              // something is completely wroong > stop evrything
 472         }
 473         return err;
 474 }
 475
 476 /*
 477  * prepare callback
 478  *
 479  * set format and initialize urbs
 480  */
 481 static int snd_usX2Y_usbpcm_prepare(struct snd_pcm_substream *substream)
 482 {
 483         struct snd_pcm_runtime *runtime = substream->runtime;
 484         struct snd_usX2Y_substream *subs = runtime->private_data;
 485         struct usX2Ydev *usX2Y = subs->usX2Y;
 486         struct snd_usX2Y_substream *capsubs = subs->usX2Y->subs[SNDRV_PCM_STREAM_CAPTURE];
 487         int err = 0;
 488         snd_printdd("snd_usX2Y_pcm_prepare(%p)\n", substream);
 489
 490         if (NULL == usX2Y->hwdep_pcm_shm) {
 491                 if (NULL == (usX2Y->hwdep_pcm_shm = snd_malloc_pages(sizeof(struct snd_usX2Y_hwdep_pcm_shm), GFP_KERNEL)))
 492                         return -ENOMEM;
 493                 memset(usX2Y->hwdep_pcm_shm, 0, sizeof(struct snd_usX2Y_hwdep_pcm_shm));
 494         }
 495
 496         mutex_lock(&usX2Y->prepare_mutex);
 497         usX2Y_subs_prepare(subs);
 498 // Start hardware streams
 499 // SyncStream first....
 500         if (atomic_read(&capsubs->state) < state_PREPARED) {
 501                 if (usX2Y->format != runtime->format)
 502                         if ((err = usX2Y_format_set(usX2Y, runtime->format)) < 0)
 503                                 goto up_prepare_mutex;
 504                 if (usX2Y->rate != runtime->rate)
 505                         if ((err = usX2Y_rate_set(usX2Y, runtime->rate)) < 0)
 506                                 goto up_prepare_mutex;
 507                 snd_printdd("starting capture pipe for %s\n", subs == capsubs ?
 508                             "self" : "playpipe");
 509                 if (0 > (err = usX2Y_usbpcm_urbs_start(capsubs)))
 510                         goto up_prepare_mutex;
 511         }
 512
 513         if (subs != capsubs) {
 514                 usX2Y->hwdep_pcm_shm->playback_iso_start = -1;
 515                 if (atomic_read(&subs->state) < state_PREPARED) {
 516                         while (usX2Y_iso_frames_per_buffer(runtime, usX2Y) >
 517                                usX2Y->hwdep_pcm_shm->captured_iso_frames) {
 518                                 snd_printdd("Wait: iso_frames_per_buffer=%i,"
 519                                             "captured_iso_frames=%i\n",
 520                                             usX2Y_iso_frames_per_buffer(runtime, usX2Y),
 521                                             usX2Y->hwdep_pcm_shm->captured_iso_frames);
 522                                 if (msleep_interruptible(10)) {
 523                                         err = -ERESTARTSYS;
 524                                         goto up_prepare_mutex;
 525                                 }
 526                         }
 527                         if (0 > (err = usX2Y_usbpcm_urbs_start(subs)))
 528                                 goto up_prepare_mutex;
 529                 }
 530                 snd_printdd("Ready: iso_frames_per_buffer=%i,captured_iso_frames=%i\n",
 531                             usX2Y_iso_frames_per_buffer(runtime, usX2Y),
 532                             usX2Y->hwdep_pcm_shm->captured_iso_frames);
 533         } else
 534                 usX2Y->hwdep_pcm_shm->capture_iso_start = -1;
 535
 536  up_prepare_mutex:
 537         mutex_unlock(&usX2Y->prepare_mutex);
 538         return err;
 539 }
 540
 541 static struct snd_pcm_hardware snd_usX2Y_4c =
 542 {
 543         .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
 544                                  SNDRV_PCM_INFO_BLOCK_TRANSFER |
 545                                  SNDRV_PCM_INFO_MMAP_VALID),
 546         .formats =                 SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_3LE,
 547         .rates =                   SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000,
 548         .rate_min =                44100,
 549         .rate_max =                48000,
 550         .channels_min =            2,
 551         .channels_max =            4,
 552         .buffer_bytes_max =     (2*128*1024),
 553         .period_bytes_min =     64,
 554         .period_bytes_max =     (128*1024),
 555         .periods_min =          2,
 556         .periods_max =          1024,
 557         .fifo_size =              0
 558 };
 559
 560
 561
 562 static int snd_usX2Y_usbpcm_open(struct snd_pcm_substream *substream)
 563 {
 564         struct snd_usX2Y_substream      *subs = ((struct snd_usX2Y_substream **)
 565                                          snd_pcm_substream_chip(substream))[substream->stream];
 566         struct snd_pcm_runtime  *runtime = substream->runtime;
 567
 568         if (!(subs->usX2Y->chip_status & USX2Y_STAT_CHIP_MMAP_PCM_URBS))
 569                 return -EBUSY;
 570
 571         runtime->hw = SNDRV_PCM_STREAM_PLAYBACK == substream->stream ? snd_usX2Y_2c :
 572                 (subs->usX2Y->subs[3] ? snd_usX2Y_4c : snd_usX2Y_2c);
 573         runtime->private_data = subs;
 574         subs->pcm_substream = substream;
 575         snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 1000, 200000);
 576         return 0;
 577 }
 578
 579
 580 static int snd_usX2Y_usbpcm_close(struct snd_pcm_substream *substream)
 581 {
 582         struct snd_pcm_runtime *runtime = substream->runtime;
 583         struct snd_usX2Y_substream *subs = runtime->private_data;
 584
 585         subs->pcm_substream = NULL;
 586         return 0;
 587 }
 588
 589
 590 static struct snd_pcm_ops snd_usX2Y_usbpcm_ops =
 591 {
 592         .open =         snd_usX2Y_usbpcm_open,
 593         .close =        snd_usX2Y_usbpcm_close,
 594         .ioctl =        snd_pcm_lib_ioctl,
 595         .hw_params =    snd_usX2Y_pcm_hw_params,
 596         .hw_free =      snd_usX2Y_usbpcm_hw_free,
 597         .prepare =      snd_usX2Y_usbpcm_prepare,
 598         .trigger =      snd_usX2Y_pcm_trigger,
 599         .pointer =      snd_usX2Y_pcm_pointer,
 600 };
 601
 602
 603 static int usX2Y_pcms_lock_check(struct snd_card *card)
 604 {
 605         struct list_head *list;
 606         struct snd_device *dev;
 607         struct snd_pcm *pcm;
 608         int err = 0;
 609         list_for_each(list, &card->devices) {
 610                 dev = snd_device(list);
 611                 if (dev->type != SNDRV_DEV_PCM)
 612                         continue;
 613                 pcm = dev->device_data;
 614                 mutex_lock(&pcm->open_mutex);
 615         }
 616         list_for_each(list, &card->devices) {
 617                 int s;
 618                 dev = snd_device(list);
 619                 if (dev->type != SNDRV_DEV_PCM)
 620                         continue;
 621                 pcm = dev->device_data;
 622                 for (s = 0; s < 2; ++s) {
 623                         struct snd_pcm_substream *substream;
 624                         substream = pcm->streams[s].substream;
 625                         if (substream && SUBSTREAM_BUSY(substream))
 626                                 err = -EBUSY;
 627                 }
 628         }
 629         return err;
 630 }
 631
 632
 633 static void usX2Y_pcms_unlock(struct snd_card *card)
 634 {
 635         struct list_head *list;
 636         struct snd_device *dev;
 637         struct snd_pcm *pcm;
 638         list_for_each(list, &card->devices) {
 639                 dev = snd_device(list);
 640                 if (dev->type != SNDRV_DEV_PCM)
 641                         continue;
 642                 pcm = dev->device_data;
 643                 mutex_unlock(&pcm->open_mutex);
 644         }
 645 }
 646
 647
 648 static int snd_usX2Y_hwdep_pcm_open(struct snd_hwdep *hw, struct file *file)
 649 {
 650         // we need to be the first
 651         struct snd_card *card = hw->card;
 652         int err = usX2Y_pcms_lock_check(card);
 653         if (0 == err)
 654                 usX2Y(card)->chip_status |= USX2Y_STAT_CHIP_MMAP_PCM_URBS;
 655         usX2Y_pcms_unlock(card);
 656         return err;
 657 }
 658
 659
 660 static int snd_usX2Y_hwdep_pcm_release(struct snd_hwdep *hw, struct file *file)
 661 {
 662         struct snd_card *card = hw->card;
 663         int err = usX2Y_pcms_lock_check(card);
 664         if (0 == err)
 665                 usX2Y(hw->card)->chip_status &= ~USX2Y_STAT_CHIP_MMAP_PCM_URBS;
 666         usX2Y_pcms_unlock(card);
 667         return err;
 668 }
 669
 670
 671 static void snd_usX2Y_hwdep_pcm_vm_open(struct vm_area_struct *area)
 672 {
 673 }
 674
 675
 676 static void snd_usX2Y_hwdep_pcm_vm_close(struct vm_area_struct *area)
 677 {
 678 }
 679
 680
 681 static int snd_usX2Y_hwdep_pcm_vm_fault(struct vm_area_struct *area,
 682                                         struct vm_fault *vmf)
 683 {
 684         unsigned long offset;
 685         void *vaddr;
 686
 687         offset = vmf->pgoff << PAGE_SHIFT;
 688         vaddr = (char*)((struct usX2Ydev *)area->vm_private_data)->hwdep_pcm_shm + offset;
 689         vmf->page = virt_to_page(vaddr);
 690         get_page(vmf->page);
 691         return 0;
 692 }
 693
 694
 695 static const struct vm_operations_struct snd_usX2Y_hwdep_pcm_vm_ops = {
 696         .open = snd_usX2Y_hwdep_pcm_vm_open,
 697         .close = snd_usX2Y_hwdep_pcm_vm_close,
 698         .fault = snd_usX2Y_hwdep_pcm_vm_fault,
 699 };
 700
 701
 702 static int snd_usX2Y_hwdep_pcm_mmap(struct snd_hwdep * hw, struct file *filp, struct vm_area_struct *area)
 703 {
 704         unsigned long   size = (unsigned long)(area->vm_end - area->vm_start);
 705         struct usX2Ydev *usX2Y = hw->private_data;
 706
 707         if (!(usX2Y->chip_status & USX2Y_STAT_CHIP_INIT))
 708                 return -EBUSY;
 709
 710         /* if userspace tries to mmap beyond end of our buffer, fail */
 711         if (size > PAGE_ALIGN(sizeof(struct snd_usX2Y_hwdep_pcm_shm))) {
 712                 snd_printd("%lu > %lu\n", size, (unsigned long)sizeof(struct snd_usX2Y_hwdep_pcm_shm));
 713                 return -EINVAL;
 714         }
 715
 716         if (!usX2Y->hwdep_pcm_shm) {
 717                 return -ENODEV;
 718         }
 719         area->vm_ops = &snd_usX2Y_hwdep_pcm_vm_ops;
 720         area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
 721         area->vm_private_data = hw->private_data;
 722         return 0;
 723 }
 724
 725
 726 static void snd_usX2Y_hwdep_pcm_private_free(struct snd_hwdep *hwdep)
 727 {
 728         struct usX2Ydev *usX2Y = hwdep->private_data;
 729         if (NULL != usX2Y->hwdep_pcm_shm)
 730                 snd_free_pages(usX2Y->hwdep_pcm_shm, sizeof(struct snd_usX2Y_hwdep_pcm_shm));
 731 }
 732
 733
 734 int usX2Y_hwdep_pcm_new(struct snd_card *card)
 735 {
 736         int err;
 737         struct snd_hwdep *hw;
 738         struct snd_pcm *pcm;
 739         struct usb_device *dev = usX2Y(card)->dev;
 740         if (1 != nr_of_packs())
 741                 return 0;
 742
 743         if ((err = snd_hwdep_new(card, SND_USX2Y_USBPCM_ID, 1, &hw)) < 0)
 744                 return err;
 745
 746         hw->iface = SNDRV_HWDEP_IFACE_USX2Y_PCM;
 747         hw->private_data = usX2Y(card);
 748         hw->private_free = snd_usX2Y_hwdep_pcm_private_free;
 749         hw->ops.open = snd_usX2Y_hwdep_pcm_open;
 750         hw->ops.release = snd_usX2Y_hwdep_pcm_release;
 751         hw->ops.mmap = snd_usX2Y_hwdep_pcm_mmap;
 752         hw->exclusive = 1;
 753         sprintf(hw->name, "/proc/bus/usb/%03d/%03d/hwdeppcm", dev->bus->busnum, dev->devnum);
 754
 755         err = snd_pcm_new(card, NAME_ALLCAPS" hwdep Audio", 2, 1, 1, &pcm);
 756         if (err < 0) {
 757                 return err;
 758         }
 759         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_usX2Y_usbpcm_ops);
 760         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_usX2Y_usbpcm_ops);
 761
 762         pcm->private_data = usX2Y(card)->subs;
 763         pcm->info_flags = 0;
 764
 765         sprintf(pcm->name, NAME_ALLCAPS" hwdep Audio");
 766         if (0 > (err = snd_pcm_lib_preallocate_pages(pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream,
 767                                                      SNDRV_DMA_TYPE_CONTINUOUS,
 768                                                      snd_dma_continuous_data(GFP_KERNEL),
 769                                                      64*1024, 128*1024)) ||
 770             0 > (err = snd_pcm_lib_preallocate_pages(pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream,
 771                                                      SNDRV_DMA_TYPE_CONTINUOUS,
 772                                                      snd_dma_continuous_data(GFP_KERNEL),
 773                                                      64*1024, 128*1024))) {
 774                 return err;
 775         }
 776
 777
 778         return 0;
 779 }
 780
 781 #else
 782
 783 int usX2Y_hwdep_pcm_new(struct snd_card *card)
 784 {
 785         return 0;
 786 }
 787
 788 #endif