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         if (likely((urb->start_frame & 0xFFFF) == (usX2Y->wait_iso_frame & 0xFFFF)))
 248                 subs->completed_urb = urb;
 249         else {
 250                 usX2Y_error_sequence(usX2Y, subs, urb);
 251                 return;
 252         }
 253
 254         capsubs = usX2Y->subs[SNDRV_PCM_STREAM_CAPTURE];
 255         capsubs2 = usX2Y->subs[SNDRV_PCM_STREAM_CAPTURE + 2];
 256         playbacksubs = usX2Y->subs[SNDRV_PCM_STREAM_PLAYBACK];
 257         if (capsubs->completed_urb && atomic_read(&capsubs->state) >= state_PREPARED &&
 258             (NULL == capsubs2 || capsubs2->completed_urb) &&
 259             (playbacksubs->completed_urb || atomic_read(&playbacksubs->state) < state_PREPARED)) {
 260                 if (!usX2Y_usbpcm_usbframe_complete(capsubs, capsubs2, playbacksubs, urb->start_frame))
 261                         usX2Y->wait_iso_frame += nr_of_packs();
 262                 else {
 263                         snd_printdd("\n");
 264                         usX2Y_clients_stop(usX2Y);
 265                 }
 266         }
 267 }
 268
 269
 270 static void usX2Y_hwdep_urb_release(struct urb **urb)
 271 {
 272         usb_kill_urb(*urb);
 273         usb_free_urb(*urb);
 274         *urb = NULL;
 275 }
 276
 277 /*
 278  * release a substream
 279  */
 280 static void usX2Y_usbpcm_urbs_release(struct snd_usX2Y_substream *subs)
 281 {
 282         int i;
 283         snd_printdd("snd_usX2Y_urbs_release() %i\n", subs->endpoint);
 284         for (i = 0; i < NRURBS; i++)
 285                 usX2Y_hwdep_urb_release(subs->urb + i);
 286 }
 287
 288 static void usX2Y_usbpcm_subs_startup_finish(struct usX2Ydev * usX2Y)
 289 {
 290         usX2Y_urbs_set_complete(usX2Y, i_usX2Y_usbpcm_urb_complete);
 291         usX2Y->prepare_subs = NULL;
 292 }
 293
 294 static void i_usX2Y_usbpcm_subs_startup(struct urb *urb)
 295 {
 296         struct snd_usX2Y_substream *subs = urb->context;
 297         struct usX2Ydev *usX2Y = subs->usX2Y;
 298         struct snd_usX2Y_substream *prepare_subs = usX2Y->prepare_subs;
 299         if (NULL != prepare_subs &&
 300             urb->start_frame == prepare_subs->urb[0]->start_frame) {
 301                 atomic_inc(&prepare_subs->state);
 302                 if (prepare_subs == usX2Y->subs[SNDRV_PCM_STREAM_CAPTURE]) {
 303                         struct snd_usX2Y_substream *cap_subs2 = usX2Y->subs[SNDRV_PCM_STREAM_CAPTURE + 2];
 304                         if (cap_subs2 != NULL)
 305                                 atomic_inc(&cap_subs2->state);
 306                 }
 307                 usX2Y_usbpcm_subs_startup_finish(usX2Y);
 308                 wake_up(&usX2Y->prepare_wait_queue);
 309         }
 310
 311         i_usX2Y_usbpcm_urb_complete(urb);
 312 }
 313
 314 /*
 315  * initialize a substream's urbs
 316  */
 317 static int usX2Y_usbpcm_urbs_allocate(struct snd_usX2Y_substream *subs)
 318 {
 319         int i;
 320         unsigned int pipe;
 321         int is_playback = subs == subs->usX2Y->subs[SNDRV_PCM_STREAM_PLAYBACK];
 322         struct usb_device *dev = subs->usX2Y->dev;
 323
 324         pipe = is_playback ? usb_sndisocpipe(dev, subs->endpoint) :
 325                         usb_rcvisocpipe(dev, subs->endpoint);
 326         subs->maxpacksize = usb_maxpacket(dev, pipe, is_playback);
 327         if (!subs->maxpacksize)
 328                 return -EINVAL;
 329
 330         /* allocate and initialize data urbs */
 331         for (i = 0; i < NRURBS; i++) {
 332                 struct urb **purb = subs->urb + i;
 333                 if (*purb) {
 334                         usb_kill_urb(*purb);
 335                         continue;
 336                 }
 337                 *purb = usb_alloc_urb(nr_of_packs(), GFP_KERNEL);
 338                 if (NULL == *purb) {
 339                         usX2Y_usbpcm_urbs_release(subs);
 340                         return -ENOMEM;
 341                 }
 342                 (*purb)->transfer_buffer = is_playback ?
 343                         subs->usX2Y->hwdep_pcm_shm->playback : (
 344                                 subs->endpoint == 0x8 ?
 345                                 subs->usX2Y->hwdep_pcm_shm->capture0x8 :
 346                                 subs->usX2Y->hwdep_pcm_shm->capture0xA);
 347
 348                 (*purb)->dev = dev;
 349                 (*purb)->pipe = pipe;
 350                 (*purb)->number_of_packets = nr_of_packs();
 351                 (*purb)->context = subs;
 352                 (*purb)->interval = 1;
 353                 (*purb)->complete = i_usX2Y_usbpcm_subs_startup;
 354         }
 355         return 0;
 356 }
 357
 358 /*
 359  * free the buffer
 360  */
 361 static int snd_usX2Y_usbpcm_hw_free(struct snd_pcm_substream *substream)
 362 {
 363         struct snd_pcm_runtime *runtime = substream->runtime;
 364         struct snd_usX2Y_substream *subs = runtime->private_data,
 365                 *cap_subs2 = subs->usX2Y->subs[SNDRV_PCM_STREAM_CAPTURE + 2];
 366         mutex_lock(&subs->usX2Y->prepare_mutex);
 367         snd_printdd("snd_usX2Y_usbpcm_hw_free(%p)\n", substream);
 368
 369         if (SNDRV_PCM_STREAM_PLAYBACK == substream->stream) {
 370                 struct snd_usX2Y_substream *cap_subs = subs->usX2Y->subs[SNDRV_PCM_STREAM_CAPTURE];
 371                 atomic_set(&subs->state, state_STOPPED);
 372                 usX2Y_usbpcm_urbs_release(subs);
 373                 if (!cap_subs->pcm_substream ||
 374                     !cap_subs->pcm_substream->runtime ||
 375                     !cap_subs->pcm_substream->runtime->status ||
 376                     cap_subs->pcm_substream->runtime->status->state < SNDRV_PCM_STATE_PREPARED) {
 377                         atomic_set(&cap_subs->state, state_STOPPED);
 378                         if (NULL != cap_subs2)
 379                                 atomic_set(&cap_subs2->state, state_STOPPED);
 380                         usX2Y_usbpcm_urbs_release(cap_subs);
 381                         if (NULL != cap_subs2)
 382                                 usX2Y_usbpcm_urbs_release(cap_subs2);
 383                 }
 384         } else {
 385                 struct snd_usX2Y_substream *playback_subs = subs->usX2Y->subs[SNDRV_PCM_STREAM_PLAYBACK];
 386                 if (atomic_read(&playback_subs->state) < state_PREPARED) {
 387                         atomic_set(&subs->state, state_STOPPED);
 388                         if (NULL != cap_subs2)
 389                                 atomic_set(&cap_subs2->state, state_STOPPED);
 390                         usX2Y_usbpcm_urbs_release(subs);
 391                         if (NULL != cap_subs2)
 392                                 usX2Y_usbpcm_urbs_release(cap_subs2);
 393                 }
 394         }
 395         mutex_unlock(&subs->usX2Y->prepare_mutex);
 396         return snd_pcm_lib_free_pages(substream);
 397 }
 398
 399 static void usX2Y_usbpcm_subs_startup(struct snd_usX2Y_substream *subs)
 400 {
 401         struct usX2Ydev * usX2Y = subs->usX2Y;
 402         usX2Y->prepare_subs = subs;
 403         subs->urb[0]->start_frame = -1;
 404         smp_wmb();      // Make sure above modifications are seen by i_usX2Y_subs_startup()
 405         usX2Y_urbs_set_complete(usX2Y, i_usX2Y_usbpcm_subs_startup);
 406 }
 407
 408 static int usX2Y_usbpcm_urbs_start(struct snd_usX2Y_substream *subs)
 409 {
 410         int     p, u, err,
 411                 stream = subs->pcm_substream->stream;
 412         struct usX2Ydev *usX2Y = subs->usX2Y;
 413
 414         if (SNDRV_PCM_STREAM_CAPTURE == stream) {
 415                 usX2Y->hwdep_pcm_shm->captured_iso_head = -1;
 416                 usX2Y->hwdep_pcm_shm->captured_iso_frames = 0;
 417         }
 418
 419         for (p = 0; 3 >= (stream + p); p += 2) {
 420                 struct snd_usX2Y_substream *subs = usX2Y->subs[stream + p];
 421                 if (subs != NULL) {
 422                         if ((err = usX2Y_usbpcm_urbs_allocate(subs)) < 0)
 423                                 return err;
 424                         subs->completed_urb = NULL;
 425                 }
 426         }
 427
 428         for (p = 0; p < 4; p++) {
 429                 struct snd_usX2Y_substream *subs = usX2Y->subs[p];
 430                 if (subs != NULL && atomic_read(&subs->state) >= state_PREPARED)
 431                         goto start;
 432         }
 433
 434  start:
 435         usX2Y_usbpcm_subs_startup(subs);
 436         for (u = 0; u < NRURBS; u++) {
 437                 for (p = 0; 3 >= (stream + p); p += 2) {
 438                         struct snd_usX2Y_substream *subs = usX2Y->subs[stream + p];
 439                         if (subs != NULL) {
 440                                 struct urb *urb = subs->urb[u];
 441                                 if (usb_pipein(urb->pipe)) {
 442                                         unsigned long pack;
 443                                         if (0 == u)
 444                                                 atomic_set(&subs->state, state_STARTING3);
 445                                         urb->dev = usX2Y->dev;
 446                                         for (pack = 0; pack < nr_of_packs(); pack++) {
 447                                                 urb->iso_frame_desc[pack].offset = subs->maxpacksize * (pack + u * nr_of_packs());
 448                                                 urb->iso_frame_desc[pack].length = subs->maxpacksize;
 449                                         }
 450                                         urb->transfer_buffer_length = subs->maxpacksize * nr_of_packs();
 451                                         if ((err = usb_submit_urb(urb, GFP_KERNEL)) < 0) {
 452                                                 snd_printk (KERN_ERR "cannot usb_submit_urb() for urb %d, err = %d\n", u, err);
 453                                                 err = -EPIPE;
 454                                                 goto cleanup;
 455                                         }  else {
 456                                                 snd_printdd("%i\n", urb->start_frame);
 457                                                 if (u == 0)
 458                                                         usX2Y->wait_iso_frame = urb->start_frame;
 459                                         }
 460                                         urb->transfer_flags = 0;
 461                                 } else {
 462                                         atomic_set(&subs->state, state_STARTING1);
 463                                         break;
 464                                 }
 465                         }
 466                 }
 467         }
 468         err = 0;
 469         wait_event(usX2Y->prepare_wait_queue, NULL == usX2Y->prepare_subs);
 470         if (atomic_read(&subs->state) != state_PREPARED)
 471                 err = -EPIPE;
 472
 473  cleanup:
 474         if (err) {
 475                 usX2Y_subs_startup_finish(usX2Y);       // Call it now
 476                 usX2Y_clients_stop(usX2Y);              // something is completely wroong > stop evrything
 477         }
 478         return err;
 479 }
 480
 481 /*
 482  * prepare callback
 483  *
 484  * set format and initialize urbs
 485  */
 486 static int snd_usX2Y_usbpcm_prepare(struct snd_pcm_substream *substream)
 487 {
 488         struct snd_pcm_runtime *runtime = substream->runtime;
 489         struct snd_usX2Y_substream *subs = runtime->private_data;
 490         struct usX2Ydev *usX2Y = subs->usX2Y;
 491         struct snd_usX2Y_substream *capsubs = subs->usX2Y->subs[SNDRV_PCM_STREAM_CAPTURE];
 492         int err = 0;
 493         snd_printdd("snd_usX2Y_pcm_prepare(%p)\n", substream);
 494
 495         if (NULL == usX2Y->hwdep_pcm_shm) {
 496                 if (NULL == (usX2Y->hwdep_pcm_shm = snd_malloc_pages(sizeof(struct snd_usX2Y_hwdep_pcm_shm), GFP_KERNEL)))
 497                         return -ENOMEM;
 498                 memset(usX2Y->hwdep_pcm_shm, 0, sizeof(struct snd_usX2Y_hwdep_pcm_shm));
 499         }
 500
 501         mutex_lock(&usX2Y->prepare_mutex);
 502         usX2Y_subs_prepare(subs);
 503 // Start hardware streams
 504 // SyncStream first....
 505         if (atomic_read(&capsubs->state) < state_PREPARED) {
 506                 if (usX2Y->format != runtime->format)
 507                         if ((err = usX2Y_format_set(usX2Y, runtime->format)) < 0)
 508                                 goto up_prepare_mutex;
 509                 if (usX2Y->rate != runtime->rate)
 510                         if ((err = usX2Y_rate_set(usX2Y, runtime->rate)) < 0)
 511                                 goto up_prepare_mutex;
 512                 snd_printdd("starting capture pipe for %s\n", subs == capsubs ?
 513                             "self" : "playpipe");
 514                 if (0 > (err = usX2Y_usbpcm_urbs_start(capsubs)))
 515                         goto up_prepare_mutex;
 516         }
 517
 518         if (subs != capsubs) {
 519                 usX2Y->hwdep_pcm_shm->playback_iso_start = -1;
 520                 if (atomic_read(&subs->state) < state_PREPARED) {
 521                         while (usX2Y_iso_frames_per_buffer(runtime, usX2Y) >
 522                                usX2Y->hwdep_pcm_shm->captured_iso_frames) {
 523                                 snd_printdd("Wait: iso_frames_per_buffer=%i,"
 524                                             "captured_iso_frames=%i\n",
 525                                             usX2Y_iso_frames_per_buffer(runtime, usX2Y),
 526                                             usX2Y->hwdep_pcm_shm->captured_iso_frames);
 527                                 if (msleep_interruptible(10)) {
 528                                         err = -ERESTARTSYS;
 529                                         goto up_prepare_mutex;
 530                                 }
 531                         }
 532                         if (0 > (err = usX2Y_usbpcm_urbs_start(subs)))
 533                                 goto up_prepare_mutex;
 534                 }
 535                 snd_printdd("Ready: iso_frames_per_buffer=%i,captured_iso_frames=%i\n",
 536                             usX2Y_iso_frames_per_buffer(runtime, usX2Y),
 537                             usX2Y->hwdep_pcm_shm->captured_iso_frames);
 538         } else
 539                 usX2Y->hwdep_pcm_shm->capture_iso_start = -1;
 540
 541  up_prepare_mutex:
 542         mutex_unlock(&usX2Y->prepare_mutex);
 543         return err;
 544 }
 545
 546 static struct snd_pcm_hardware snd_usX2Y_4c =
 547 {
 548         .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
 549                                  SNDRV_PCM_INFO_BLOCK_TRANSFER |
 550                                  SNDRV_PCM_INFO_MMAP_VALID),
 551         .formats =                 SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_3LE,
 552         .rates =                   SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000,
 553         .rate_min =                44100,
 554         .rate_max =                48000,
 555         .channels_min =            2,
 556         .channels_max =            4,
 557         .buffer_bytes_max =     (2*128*1024),
 558         .period_bytes_min =     64,
 559         .period_bytes_max =     (128*1024),
 560         .periods_min =          2,
 561         .periods_max =          1024,
 562         .fifo_size =              0
 563 };
 564
 565
 566
 567 static int snd_usX2Y_usbpcm_open(struct snd_pcm_substream *substream)
 568 {
 569         struct snd_usX2Y_substream      *subs = ((struct snd_usX2Y_substream **)
 570                                          snd_pcm_substream_chip(substream))[substream->stream];
 571         struct snd_pcm_runtime  *runtime = substream->runtime;
 572
 573         if (!(subs->usX2Y->chip_status & USX2Y_STAT_CHIP_MMAP_PCM_URBS))
 574                 return -EBUSY;
 575
 576         runtime->hw = SNDRV_PCM_STREAM_PLAYBACK == substream->stream ? snd_usX2Y_2c :
 577                 (subs->usX2Y->subs[3] ? snd_usX2Y_4c : snd_usX2Y_2c);
 578         runtime->private_data = subs;
 579         subs->pcm_substream = substream;
 580         snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 1000, 200000);
 581         return 0;
 582 }
 583
 584
 585 static int snd_usX2Y_usbpcm_close(struct snd_pcm_substream *substream)
 586 {
 587         struct snd_pcm_runtime *runtime = substream->runtime;
 588         struct snd_usX2Y_substream *subs = runtime->private_data;
 589
 590         subs->pcm_substream = NULL;
 591         return 0;
 592 }
 593
 594
 595 static struct snd_pcm_ops snd_usX2Y_usbpcm_ops =
 596 {
 597         .open =         snd_usX2Y_usbpcm_open,
 598         .close =        snd_usX2Y_usbpcm_close,
 599         .ioctl =        snd_pcm_lib_ioctl,
 600         .hw_params =    snd_usX2Y_pcm_hw_params,
 601         .hw_free =      snd_usX2Y_usbpcm_hw_free,
 602         .prepare =      snd_usX2Y_usbpcm_prepare,
 603         .trigger =      snd_usX2Y_pcm_trigger,
 604         .pointer =      snd_usX2Y_pcm_pointer,
 605 };
 606
 607
 608 static int usX2Y_pcms_lock_check(struct snd_card *card)
 609 {
 610         struct list_head *list;
 611         struct snd_device *dev;
 612         struct snd_pcm *pcm;
 613         int err = 0;
 614         list_for_each(list, &card->devices) {
 615                 dev = snd_device(list);
 616                 if (dev->type != SNDRV_DEV_PCM)
 617                         continue;
 618                 pcm = dev->device_data;
 619                 mutex_lock(&pcm->open_mutex);
 620         }
 621         list_for_each(list, &card->devices) {
 622                 int s;
 623                 dev = snd_device(list);
 624                 if (dev->type != SNDRV_DEV_PCM)
 625                         continue;
 626                 pcm = dev->device_data;
 627                 for (s = 0; s < 2; ++s) {
 628                         struct snd_pcm_substream *substream;
 629                         substream = pcm->streams[s].substream;
 630                         if (substream && SUBSTREAM_BUSY(substream))
 631                                 err = -EBUSY;
 632                 }
 633         }
 634         return err;
 635 }
 636
 637
 638 static void usX2Y_pcms_unlock(struct snd_card *card)
 639 {
 640         struct list_head *list;
 641         struct snd_device *dev;
 642         struct snd_pcm *pcm;
 643         list_for_each(list, &card->devices) {
 644                 dev = snd_device(list);
 645                 if (dev->type != SNDRV_DEV_PCM)
 646                         continue;
 647                 pcm = dev->device_data;
 648                 mutex_unlock(&pcm->open_mutex);
 649         }
 650 }
 651
 652
 653 static int snd_usX2Y_hwdep_pcm_open(struct snd_hwdep *hw, struct file *file)
 654 {
 655         // we need to be the first
 656         struct snd_card *card = hw->card;
 657         int err = usX2Y_pcms_lock_check(card);
 658         if (0 == err)
 659                 usX2Y(card)->chip_status |= USX2Y_STAT_CHIP_MMAP_PCM_URBS;
 660         usX2Y_pcms_unlock(card);
 661         return err;
 662 }
 663
 664
 665 static int snd_usX2Y_hwdep_pcm_release(struct snd_hwdep *hw, struct file *file)
 666 {
 667         struct snd_card *card = hw->card;
 668         int err = usX2Y_pcms_lock_check(card);
 669         if (0 == err)
 670                 usX2Y(hw->card)->chip_status &= ~USX2Y_STAT_CHIP_MMAP_PCM_URBS;
 671         usX2Y_pcms_unlock(card);
 672         return err;
 673 }
 674
 675
 676 static void snd_usX2Y_hwdep_pcm_vm_open(struct vm_area_struct *area)
 677 {
 678 }
 679
 680
 681 static void snd_usX2Y_hwdep_pcm_vm_close(struct vm_area_struct *area)
 682 {
 683 }
 684
 685
 686 static int snd_usX2Y_hwdep_pcm_vm_fault(struct vm_area_struct *area,
 687                                         struct vm_fault *vmf)
 688 {
 689         unsigned long offset;
 690         void *vaddr;
 691
 692         offset = vmf->pgoff << PAGE_SHIFT;
 693         vaddr = (char*)((struct usX2Ydev *)area->vm_private_data)->hwdep_pcm_shm + offset;
 694         vmf->page = virt_to_page(vaddr);
 695         get_page(vmf->page);
 696         return 0;
 697 }
 698
 699
 700 static const struct vm_operations_struct snd_usX2Y_hwdep_pcm_vm_ops = {
 701         .open = snd_usX2Y_hwdep_pcm_vm_open,
 702         .close = snd_usX2Y_hwdep_pcm_vm_close,
 703         .fault = snd_usX2Y_hwdep_pcm_vm_fault,
 704 };
 705
 706
 707 static int snd_usX2Y_hwdep_pcm_mmap(struct snd_hwdep * hw, struct file *filp, struct vm_area_struct *area)
 708 {
 709         unsigned long   size = (unsigned long)(area->vm_end - area->vm_start);
 710         struct usX2Ydev *usX2Y = hw->private_data;
 711
 712         if (!(usX2Y->chip_status & USX2Y_STAT_CHIP_INIT))
 713                 return -EBUSY;
 714
 715         /* if userspace tries to mmap beyond end of our buffer, fail */
 716         if (size > PAGE_ALIGN(sizeof(struct snd_usX2Y_hwdep_pcm_shm))) {
 717                 snd_printd("%lu > %lu\n", size, (unsigned long)sizeof(struct snd_usX2Y_hwdep_pcm_shm));
 718                 return -EINVAL;
 719         }
 720
 721         if (!usX2Y->hwdep_pcm_shm) {
 722                 return -ENODEV;
 723         }
 724         area->vm_ops = &snd_usX2Y_hwdep_pcm_vm_ops;
 725         area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
 726         area->vm_private_data = hw->private_data;
 727         return 0;
 728 }
 729
 730
 731 static void snd_usX2Y_hwdep_pcm_private_free(struct snd_hwdep *hwdep)
 732 {
 733         struct usX2Ydev *usX2Y = hwdep->private_data;
 734         if (NULL != usX2Y->hwdep_pcm_shm)
 735                 snd_free_pages(usX2Y->hwdep_pcm_shm, sizeof(struct snd_usX2Y_hwdep_pcm_shm));
 736 }
 737
 738
 739 int usX2Y_hwdep_pcm_new(struct snd_card *card)
 740 {
 741         int err;
 742         struct snd_hwdep *hw;
 743         struct snd_pcm *pcm;
 744         struct usb_device *dev = usX2Y(card)->dev;
 745         if (1 != nr_of_packs())
 746                 return 0;
 747
 748         if ((err = snd_hwdep_new(card, SND_USX2Y_USBPCM_ID, 1, &hw)) < 0)
 749                 return err;
 750
 751         hw->iface = SNDRV_HWDEP_IFACE_USX2Y_PCM;
 752         hw->private_data = usX2Y(card);
 753         hw->private_free = snd_usX2Y_hwdep_pcm_private_free;
 754         hw->ops.open = snd_usX2Y_hwdep_pcm_open;
 755         hw->ops.release = snd_usX2Y_hwdep_pcm_release;
 756         hw->ops.mmap = snd_usX2Y_hwdep_pcm_mmap;
 757         hw->exclusive = 1;
 758         sprintf(hw->name, "/proc/bus/usb/%03d/%03d/hwdeppcm", dev->bus->busnum, dev->devnum);
 759
 760         err = snd_pcm_new(card, NAME_ALLCAPS" hwdep Audio", 2, 1, 1, &pcm);
 761         if (err < 0) {
 762                 return err;
 763         }
 764         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_usX2Y_usbpcm_ops);
 765         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_usX2Y_usbpcm_ops);
 766
 767         pcm->private_data = usX2Y(card)->subs;
 768         pcm->info_flags = 0;
 769
 770         sprintf(pcm->name, NAME_ALLCAPS" hwdep Audio");
 771         if (0 > (err = snd_pcm_lib_preallocate_pages(pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream,
 772                                                      SNDRV_DMA_TYPE_CONTINUOUS,
 773                                                      snd_dma_continuous_data(GFP_KERNEL),
 774                                                      64*1024, 128*1024)) ||
 775             0 > (err = snd_pcm_lib_preallocate_pages(pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream,
 776                                                      SNDRV_DMA_TYPE_CONTINUOUS,
 777                                                      snd_dma_continuous_data(GFP_KERNEL),
 778                                                      64*1024, 128*1024))) {
 779                 return err;
 780         }
 781
 782
 783         return 0;
 784 }
 785
 786 #else
 787
 788 int usX2Y_hwdep_pcm_new(struct snd_card *card)
 789 {
 790         return 0;
 791 }
 792
 793 #endif