sound/usb/usx2y/usbusx2yaudio.c

   1 /*
   2  *   US-X2Y AUDIO
   3  *   Copyright (c) 2002-2004 by Karsten Wiese
   4  *
   5  *   based on
   6  *
   7  *   (Tentative) USB Audio Driver for ALSA
   8  *
   9  *   Main and PCM part
  10  *
  11  *   Copyright (c) 2002 by Takashi Iwai <tiwai@suse.de>
  12  *
  13  *   Many codes borrowed from audio.c by
  14  *          Alan Cox (alan@lxorguk.ukuu.org.uk)
  15  *          Thomas Sailer (sailer@ife.ee.ethz.ch)
  16  *
  17  *
  18  *   This program is free software; you can redistribute it and/or modify
  19  *   it under the terms of the GNU General Public License as published by
  20  *   the Free Software Foundation; either version 2 of the License, or
  21  *   (at your option) any later version.
  22  *
  23  *   This program is distributed in the hope that it will be useful,
  24  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  25  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  26  *   GNU General Public License for more details.
  27  *
  28  *   You should have received a copy of the GNU General Public License
  29  *   along with this program; if not, write to the Free Software
  30  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  31  */
  32
  33
  34 #include <linux/interrupt.h>
  35 #include <linux/slab.h>
  36 #include <linux/usb.h>
  37 #include <linux/moduleparam.h>
  38 #include <sound/core.h>
  39 #include <sound/info.h>
  40 #include <sound/pcm.h>
  41 #include <sound/pcm_params.h>
  42 #include "usx2y.h"
  43 #include "usbusx2y.h"
  44
  45 #define USX2Y_NRPACKS 4                 /* Default value used for nr of packs per urb.
  46                                           1 to 4 have been tested ok on uhci.
  47                                           To use 3 on ohci, you'd need a patch:
  48                                           look for "0000425-linux-2.6.9-rc4-mm1_ohci-hcd.patch.gz" on
  49                                           "https://bugtrack.alsa-project.org/alsa-bug/bug_view_page.php?bug_id=0000425"
  50                                           .
  51                                           1, 2 and 4 work out of the box on ohci, if I recall correctly.
  52                                           Bigger is safer operation,
  53                                           smaller gives lower latencies.
  54                                         */
  55 #define USX2Y_NRPACKS_VARIABLE y        /* If your system works ok with this module's parameter
  56                                            nrpacks set to 1, you might as well comment
  57                                            this #define out, and thereby produce smaller, faster code.
  58                                            You'd also set USX2Y_NRPACKS to 1 then.
  59                                         */
  60
  61 #ifdef USX2Y_NRPACKS_VARIABLE
  62  static int nrpacks = USX2Y_NRPACKS; /* number of packets per urb */
  63  #define  nr_of_packs() nrpacks
  64  module_param(nrpacks, int, 0444);
  65  MODULE_PARM_DESC(nrpacks, "Number of packets per URB.");
  66 #else
  67  #define nr_of_packs() USX2Y_NRPACKS
  68 #endif
  69
  70
  71 static int usX2Y_urb_capt_retire(struct snd_usX2Y_substream *subs)
  72 {
  73         struct urb      *urb = subs->completed_urb;
  74         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
  75         unsigned char   *cp;
  76         int             i, len, lens = 0, hwptr_done = subs->hwptr_done;
  77         struct usX2Ydev *usX2Y = subs->usX2Y;
  78
  79         for (i = 0; i < nr_of_packs(); i++) {
  80                 cp = (unsigned char*)urb->transfer_buffer + urb->iso_frame_desc[i].offset;
  81                 if (urb->iso_frame_desc[i].status) { /* active? hmm, skip this */
  82                         snd_printk(KERN_ERR "active frame status %i. "
  83                                    "Most probably some hardware problem.\n",
  84                                    urb->iso_frame_desc[i].status);
  85                         return urb->iso_frame_desc[i].status;
  86                 }
  87                 len = urb->iso_frame_desc[i].actual_length / usX2Y->stride;
  88                 if (! len) {
  89                         snd_printd("0 == len ERROR!\n");
  90                         continue;
  91                 }
  92
  93                 /* copy a data chunk */
  94                 if ((hwptr_done + len) > runtime->buffer_size) {
  95                         int cnt = runtime->buffer_size - hwptr_done;
  96                         int blen = cnt * usX2Y->stride;
  97                         memcpy(runtime->dma_area + hwptr_done * usX2Y->stride, cp, blen);
  98                         memcpy(runtime->dma_area, cp + blen, len * usX2Y->stride - blen);
  99                 } else {
 100                         memcpy(runtime->dma_area + hwptr_done * usX2Y->stride, cp,
 101                                len * usX2Y->stride);
 102                 }
 103                 lens += len;
 104                 if ((hwptr_done += len) >= runtime->buffer_size)
 105                         hwptr_done -= runtime->buffer_size;
 106         }
 107
 108         subs->hwptr_done = hwptr_done;
 109         subs->transfer_done += lens;
 110         /* update the pointer, call callback if necessary */
 111         if (subs->transfer_done >= runtime->period_size) {
 112                 subs->transfer_done -= runtime->period_size;
 113                 snd_pcm_period_elapsed(subs->pcm_substream);
 114         }
 115         return 0;
 116 }
 117 /*
 118  * prepare urb for playback data pipe
 119  *
 120  * we copy the data directly from the pcm buffer.
 121  * the current position to be copied is held in hwptr field.
 122  * since a urb can handle only a single linear buffer, if the total
 123  * transferred area overflows the buffer boundary, we cannot send
 124  * it directly from the buffer.  thus the data is once copied to
 125  * a temporary buffer and urb points to that.
 126  */
 127 static int usX2Y_urb_play_prepare(struct snd_usX2Y_substream *subs,
 128                                   struct urb *cap_urb,
 129                                   struct urb *urb)
 130 {
 131         int count, counts, pack;
 132         struct usX2Ydev *usX2Y = subs->usX2Y;
 133         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
 134
 135         count = 0;
 136         for (pack = 0; pack <  nr_of_packs(); pack++) {
 137                 /* calculate the size of a packet */
 138                 counts = cap_urb->iso_frame_desc[pack].actual_length / usX2Y->stride;
 139                 count += counts;
 140                 if (counts < 43 || counts > 50) {
 141                         snd_printk(KERN_ERR "should not be here with counts=%i\n", counts);
 142                         return -EPIPE;
 143                 }
 144                 /* set up descriptor */
 145                 urb->iso_frame_desc[pack].offset = pack ?
 146                         urb->iso_frame_desc[pack - 1].offset +
 147                         urb->iso_frame_desc[pack - 1].length :
 148                         0;
 149                 urb->iso_frame_desc[pack].length = cap_urb->iso_frame_desc[pack].actual_length;
 150         }
 151         if (atomic_read(&subs->state) >= state_PRERUNNING)
 152                 if (subs->hwptr + count > runtime->buffer_size) {
 153                         /* err, the transferred area goes over buffer boundary.
 154                          * copy the data to the temp buffer.
 155                          */
 156                         int len;
 157                         len = runtime->buffer_size - subs->hwptr;
 158                         urb->transfer_buffer = subs->tmpbuf;
 159                         memcpy(subs->tmpbuf, runtime->dma_area +
 160                                subs->hwptr * usX2Y->stride, len * usX2Y->stride);
 161                         memcpy(subs->tmpbuf + len * usX2Y->stride,
 162                                runtime->dma_area, (count - len) * usX2Y->stride);
 163                         subs->hwptr += count;
 164                         subs->hwptr -= runtime->buffer_size;
 165                 } else {
 166                         /* set the buffer pointer */
 167                         urb->transfer_buffer = runtime->dma_area + subs->hwptr * usX2Y->stride;
 168                         if ((subs->hwptr += count) >= runtime->buffer_size)
 169                         subs->hwptr -= runtime->buffer_size;
 170                 }
 171         else
 172                 urb->transfer_buffer = subs->tmpbuf;
 173         urb->transfer_buffer_length = count * usX2Y->stride;
 174         return 0;
 175 }
 176
 177 /*
 178  * process after playback data complete
 179  *
 180  * update the current position and call callback if a period is processed.
 181  */
 182 static void usX2Y_urb_play_retire(struct snd_usX2Y_substream *subs, struct urb *urb)
 183 {
 184         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
 185         int             len = urb->actual_length / subs->usX2Y->stride;
 186
 187         subs->transfer_done += len;
 188         subs->hwptr_done +=  len;
 189         if (subs->hwptr_done >= runtime->buffer_size)
 190                 subs->hwptr_done -= runtime->buffer_size;
 191         if (subs->transfer_done >= runtime->period_size) {
 192                 subs->transfer_done -= runtime->period_size;
 193                 snd_pcm_period_elapsed(subs->pcm_substream);
 194         }
 195 }
 196
 197 static int usX2Y_urb_submit(struct snd_usX2Y_substream *subs, struct urb *urb, int frame)
 198 {
 199         int err;
 200         if (!urb)
 201                 return -ENODEV;
 202         urb->start_frame = (frame + NRURBS * nr_of_packs());  // let hcd do rollover sanity checks
 203         urb->hcpriv = NULL;
 204         urb->dev = subs->usX2Y->dev; /* we need to set this at each time */
 205         if ((err = usb_submit_urb(urb, GFP_ATOMIC)) < 0) {
 206                 snd_printk(KERN_ERR "usb_submit_urb() returned %i\n", err);
 207                 return err;
 208         }
 209         return 0;
 210 }
 211
 212 static inline int usX2Y_usbframe_complete(struct snd_usX2Y_substream *capsubs,
 213                                           struct snd_usX2Y_substream *playbacksubs,
 214                                           int frame)
 215 {
 216         int err, state;
 217         struct urb *urb = playbacksubs->completed_urb;
 218
 219         state = atomic_read(&playbacksubs->state);
 220         if (NULL != urb) {
 221                 if (state == state_RUNNING)
 222                         usX2Y_urb_play_retire(playbacksubs, urb);
 223                 else if (state >= state_PRERUNNING)
 224                         atomic_inc(&playbacksubs->state);
 225         } else {
 226                 switch (state) {
 227                 case state_STARTING1:
 228                         urb = playbacksubs->urb[0];
 229                         atomic_inc(&playbacksubs->state);
 230                         break;
 231                 case state_STARTING2:
 232                         urb = playbacksubs->urb[1];
 233                         atomic_inc(&playbacksubs->state);
 234                         break;
 235                 }
 236         }
 237         if (urb) {
 238                 if ((err = usX2Y_urb_play_prepare(playbacksubs, capsubs->completed_urb, urb)) ||
 239                     (err = usX2Y_urb_submit(playbacksubs, urb, frame))) {
 240                         return err;
 241                 }
 242         }
 243
 244         playbacksubs->completed_urb = NULL;
 245
 246         state = atomic_read(&capsubs->state);
 247         if (state >= state_PREPARED) {
 248                 if (state == state_RUNNING) {
 249                         if ((err = usX2Y_urb_capt_retire(capsubs)))
 250                                 return err;
 251                 } else if (state >= state_PRERUNNING)
 252                         atomic_inc(&capsubs->state);
 253                 if ((err = usX2Y_urb_submit(capsubs, capsubs->completed_urb, frame)))
 254                         return err;
 255         }
 256         capsubs->completed_urb = NULL;
 257         return 0;
 258 }
 259
 260
 261 static void usX2Y_clients_stop(struct usX2Ydev *usX2Y)
 262 {
 263         int s, u;
 264
 265         for (s = 0; s < 4; s++) {
 266                 struct snd_usX2Y_substream *subs = usX2Y->subs[s];
 267                 if (subs) {
 268                         snd_printdd("%i %p state=%i\n", s, subs, atomic_read(&subs->state));
 269                         atomic_set(&subs->state, state_STOPPED);
 270                 }
 271         }
 272         for (s = 0; s < 4; s++) {
 273                 struct snd_usX2Y_substream *subs = usX2Y->subs[s];
 274                 if (subs) {
 275                         if (atomic_read(&subs->state) >= state_PRERUNNING) {
 276                                 snd_pcm_stop(subs->pcm_substream, SNDRV_PCM_STATE_XRUN);
 277                         }
 278                         for (u = 0; u < NRURBS; u++) {
 279                                 struct urb *urb = subs->urb[u];
 280                                 if (NULL != urb)
 281                                         snd_printdd("%i status=%i start_frame=%i\n",
 282                                                     u, urb->status, urb->start_frame);
 283                         }
 284                 }
 285         }
 286         usX2Y->prepare_subs = NULL;
 287         wake_up(&usX2Y->prepare_wait_queue);
 288 }
 289
 290 static void usX2Y_error_urb_status(struct usX2Ydev *usX2Y,
 291                                    struct snd_usX2Y_substream *subs, struct urb *urb)
 292 {
 293         snd_printk(KERN_ERR "ep=%i stalled with status=%i\n", subs->endpoint, urb->status);
 294         urb->status = 0;
 295         usX2Y_clients_stop(usX2Y);
 296 }
 297
 298 static void usX2Y_error_sequence(struct usX2Ydev *usX2Y,
 299                                  struct snd_usX2Y_substream *subs, struct urb *urb)
 300 {
 301         snd_printk(KERN_ERR
 302 "Sequence Error!(hcd_frame=%i ep=%i%s;wait=%i,frame=%i).\n"
 303 "Most probably some urb of usb-frame %i is still missing.\n"
 304 "Cause could be too long delays in usb-hcd interrupt handling.\n",
 305                    usb_get_current_frame_number(usX2Y->dev),
 306                    subs->endpoint, usb_pipein(urb->pipe) ? "in" : "out",
 307                    usX2Y->wait_iso_frame, urb->start_frame, usX2Y->wait_iso_frame);
 308         usX2Y_clients_stop(usX2Y);
 309 }
 310
 311 static void i_usX2Y_urb_complete(struct urb *urb)
 312 {
 313         struct snd_usX2Y_substream *subs = urb->context;
 314         struct usX2Ydev *usX2Y = subs->usX2Y;
 315
 316         if (unlikely(atomic_read(&subs->state) < state_PREPARED)) {
 317                 snd_printdd("hcd_frame=%i ep=%i%s status=%i start_frame=%i\n",
 318                             usb_get_current_frame_number(usX2Y->dev),
 319                             subs->endpoint, usb_pipein(urb->pipe) ? "in" : "out",
 320                             urb->status, urb->start_frame);
 321                 return;
 322         }
 323         if (unlikely(urb->status)) {
 324                 usX2Y_error_urb_status(usX2Y, subs, urb);
 325                 return;
 326         }
 327         if (likely((urb->start_frame & 0xFFFF) == (usX2Y->wait_iso_frame & 0xFFFF)))
 328                 subs->completed_urb = urb;
 329         else {
 330                 usX2Y_error_sequence(usX2Y, subs, urb);
 331                 return;
 332         }
 333         {
 334                 struct snd_usX2Y_substream *capsubs = usX2Y->subs[SNDRV_PCM_STREAM_CAPTURE],
 335                         *playbacksubs = usX2Y->subs[SNDRV_PCM_STREAM_PLAYBACK];
 336                 if (capsubs->completed_urb &&
 337                     atomic_read(&capsubs->state) >= state_PREPARED &&
 338                     (playbacksubs->completed_urb ||
 339                      atomic_read(&playbacksubs->state) < state_PREPARED)) {
 340                         if (!usX2Y_usbframe_complete(capsubs, playbacksubs, urb->start_frame))
 341                                 usX2Y->wait_iso_frame += nr_of_packs();
 342                         else {
 343                                 snd_printdd("\n");
 344                                 usX2Y_clients_stop(usX2Y);
 345                         }
 346                 }
 347         }
 348 }
 349
 350 static void usX2Y_urbs_set_complete(struct usX2Ydev * usX2Y,
 351                                     void (*complete)(struct urb *))
 352 {
 353         int s, u;
 354         for (s = 0; s < 4; s++) {
 355                 struct snd_usX2Y_substream *subs = usX2Y->subs[s];
 356                 if (NULL != subs)
 357                         for (u = 0; u < NRURBS; u++) {
 358                                 struct urb * urb = subs->urb[u];
 359                                 if (NULL != urb)
 360                                         urb->complete = complete;
 361                         }
 362         }
 363 }
 364
 365 static void usX2Y_subs_startup_finish(struct usX2Ydev * usX2Y)
 366 {
 367         usX2Y_urbs_set_complete(usX2Y, i_usX2Y_urb_complete);
 368         usX2Y->prepare_subs = NULL;
 369 }
 370
 371 static void i_usX2Y_subs_startup(struct urb *urb)
 372 {
 373         struct snd_usX2Y_substream *subs = urb->context;
 374         struct usX2Ydev *usX2Y = subs->usX2Y;
 375         struct snd_usX2Y_substream *prepare_subs = usX2Y->prepare_subs;
 376         if (NULL != prepare_subs)
 377                 if (urb->start_frame == prepare_subs->urb[0]->start_frame) {
 378                         usX2Y_subs_startup_finish(usX2Y);
 379                         atomic_inc(&prepare_subs->state);
 380                         wake_up(&usX2Y->prepare_wait_queue);
 381                 }
 382
 383         i_usX2Y_urb_complete(urb);
 384 }
 385
 386 static void usX2Y_subs_prepare(struct snd_usX2Y_substream *subs)
 387 {
 388         snd_printdd("usX2Y_substream_prepare(%p) ep=%i urb0=%p urb1=%p\n",
 389                     subs, subs->endpoint, subs->urb[0], subs->urb[1]);
 390         /* reset the pointer */
 391         subs->hwptr = 0;
 392         subs->hwptr_done = 0;
 393         subs->transfer_done = 0;
 394 }
 395
 396
 397 static void usX2Y_urb_release(struct urb **urb, int free_tb)
 398 {
 399         if (*urb) {
 400                 usb_kill_urb(*urb);
 401                 if (free_tb)
 402                         kfree((*urb)->transfer_buffer);
 403                 usb_free_urb(*urb);
 404                 *urb = NULL;
 405         }
 406 }
 407 /*
 408  * release a substreams urbs
 409  */
 410 static void usX2Y_urbs_release(struct snd_usX2Y_substream *subs)
 411 {
 412         int i;
 413         snd_printdd("usX2Y_urbs_release() %i\n", subs->endpoint);
 414         for (i = 0; i < NRURBS; i++)
 415                 usX2Y_urb_release(subs->urb + i,
 416                                   subs != subs->usX2Y->subs[SNDRV_PCM_STREAM_PLAYBACK]);
 417
 418         kfree(subs->tmpbuf);
 419         subs->tmpbuf = NULL;
 420 }
 421 /*
 422  * initialize a substream's urbs
 423  */
 424 static int usX2Y_urbs_allocate(struct snd_usX2Y_substream *subs)
 425 {
 426         int i;
 427         unsigned int pipe;
 428         int is_playback = subs == subs->usX2Y->subs[SNDRV_PCM_STREAM_PLAYBACK];
 429         struct usb_device *dev = subs->usX2Y->dev;
 430
 431         pipe = is_playback ? usb_sndisocpipe(dev, subs->endpoint) :
 432                         usb_rcvisocpipe(dev, subs->endpoint);
 433         subs->maxpacksize = usb_maxpacket(dev, pipe, is_playback);
 434         if (!subs->maxpacksize)
 435                 return -EINVAL;
 436
 437         if (is_playback && NULL == subs->tmpbuf) {      /* allocate a temporary buffer for playback */
 438                 subs->tmpbuf = kcalloc(nr_of_packs(), subs->maxpacksize, GFP_KERNEL);
 439                 if (NULL == subs->tmpbuf) {
 440                         snd_printk(KERN_ERR "cannot malloc tmpbuf\n");
 441                         return -ENOMEM;
 442                 }
 443         }
 444         /* allocate and initialize data urbs */
 445         for (i = 0; i < NRURBS; i++) {
 446                 struct urb **purb = subs->urb + i;
 447                 if (*purb) {
 448                         usb_kill_urb(*purb);
 449                         continue;
 450                 }
 451                 *purb = usb_alloc_urb(nr_of_packs(), GFP_KERNEL);
 452                 if (NULL == *purb) {
 453                         usX2Y_urbs_release(subs);
 454                         return -ENOMEM;
 455                 }
 456                 if (!is_playback && !(*purb)->transfer_buffer) {
 457                         /* allocate a capture buffer per urb */
 458                         (*purb)->transfer_buffer = kmalloc(subs->maxpacksize * nr_of_packs(), GFP_KERNEL);
 459                         if (NULL == (*purb)->transfer_buffer) {
 460                                 usX2Y_urbs_release(subs);
 461                                 return -ENOMEM;
 462                         }
 463                 }
 464                 (*purb)->dev = dev;
 465                 (*purb)->pipe = pipe;
 466                 (*purb)->number_of_packets = nr_of_packs();
 467                 (*purb)->context = subs;
 468                 (*purb)->interval = 1;
 469                 (*purb)->complete = i_usX2Y_subs_startup;
 470         }
 471         return 0;
 472 }
 473
 474 static void usX2Y_subs_startup(struct snd_usX2Y_substream *subs)
 475 {
 476         struct usX2Ydev *usX2Y = subs->usX2Y;
 477         usX2Y->prepare_subs = subs;
 478         subs->urb[0]->start_frame = -1;
 479         wmb();
 480         usX2Y_urbs_set_complete(usX2Y, i_usX2Y_subs_startup);
 481 }
 482
 483 static int usX2Y_urbs_start(struct snd_usX2Y_substream *subs)
 484 {
 485         int i, err;
 486         struct usX2Ydev *usX2Y = subs->usX2Y;
 487
 488         if ((err = usX2Y_urbs_allocate(subs)) < 0)
 489                 return err;
 490         subs->completed_urb = NULL;
 491         for (i = 0; i < 4; i++) {
 492                 struct snd_usX2Y_substream *subs = usX2Y->subs[i];
 493                 if (subs != NULL && atomic_read(&subs->state) >= state_PREPARED)
 494                         goto start;
 495         }
 496
 497  start:
 498         usX2Y_subs_startup(subs);
 499         for (i = 0; i < NRURBS; i++) {
 500                 struct urb *urb = subs->urb[i];
 501                 if (usb_pipein(urb->pipe)) {
 502                         unsigned long pack;
 503                         if (0 == i)
 504                                 atomic_set(&subs->state, state_STARTING3);
 505                         urb->dev = usX2Y->dev;
 506                         for (pack = 0; pack < nr_of_packs(); pack++) {
 507                                 urb->iso_frame_desc[pack].offset = subs->maxpacksize * pack;
 508                                 urb->iso_frame_desc[pack].length = subs->maxpacksize;
 509                         }
 510                         urb->transfer_buffer_length = subs->maxpacksize * nr_of_packs();
 511                         if ((err = usb_submit_urb(urb, GFP_ATOMIC)) < 0) {
 512                                 snd_printk (KERN_ERR "cannot submit datapipe for urb %d, err = %d\n", i, err);
 513                                 err = -EPIPE;
 514                                 goto cleanup;
 515                         } else
 516                                 if (i == 0)
 517                                         usX2Y->wait_iso_frame = urb->start_frame;
 518                         urb->transfer_flags = 0;
 519                 } else {
 520                         atomic_set(&subs->state, state_STARTING1);
 521                         break;
 522                 }
 523         }
 524         err = 0;
 525         wait_event(usX2Y->prepare_wait_queue, NULL == usX2Y->prepare_subs);
 526         if (atomic_read(&subs->state) != state_PREPARED)
 527                 err = -EPIPE;
 528
 529  cleanup:
 530         if (err) {
 531                 usX2Y_subs_startup_finish(usX2Y);
 532                 usX2Y_clients_stop(usX2Y);              // something is completely wroong > stop evrything
 533         }
 534         return err;
 535 }
 536
 537 /*
 538  * return the current pcm pointer.  just return the hwptr_done value.
 539  */
 540 static snd_pcm_uframes_t snd_usX2Y_pcm_pointer(struct snd_pcm_substream *substream)
 541 {
 542         struct snd_usX2Y_substream *subs = substream->runtime->private_data;
 543         return subs->hwptr_done;
 544 }
 545 /*
 546  * start/stop substream
 547  */
 548 static int snd_usX2Y_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 549 {
 550         struct snd_usX2Y_substream *subs = substream->runtime->private_data;
 551
 552         switch (cmd) {
 553         case SNDRV_PCM_TRIGGER_START:
 554                 snd_printdd("snd_usX2Y_pcm_trigger(START)\n");
 555                 if (atomic_read(&subs->state) == state_PREPARED &&
 556                     atomic_read(&subs->usX2Y->subs[SNDRV_PCM_STREAM_CAPTURE]->state) >= state_PREPARED) {
 557                         atomic_set(&subs->state, state_PRERUNNING);
 558                 } else {
 559                         snd_printdd("\n");
 560                         return -EPIPE;
 561                 }
 562                 break;
 563         case SNDRV_PCM_TRIGGER_STOP:
 564                 snd_printdd("snd_usX2Y_pcm_trigger(STOP)\n");
 565                 if (atomic_read(&subs->state) >= state_PRERUNNING)
 566                         atomic_set(&subs->state, state_PREPARED);
 567                 break;
 568         default:
 569                 return -EINVAL;
 570         }
 571         return 0;
 572 }
 573
 574
 575 /*
 576  * allocate a buffer, setup samplerate
 577  *
 578  * so far we use a physically linear buffer although packetize transfer
 579  * doesn't need a continuous area.
 580  * if sg buffer is supported on the later version of alsa, we'll follow
 581  * that.
 582  */
 583 static struct s_c2
 584 {
 585         char c1, c2;
 586 }
 587         SetRate44100[] =
 588 {
 589         { 0x14, 0x08},  // this line sets 44100, well actually a little less
 590         { 0x18, 0x40},  // only tascam / frontier design knows the further lines .......
 591         { 0x18, 0x42},
 592         { 0x18, 0x45},
 593         { 0x18, 0x46},
 594         { 0x18, 0x48},
 595         { 0x18, 0x4A},
 596         { 0x18, 0x4C},
 597         { 0x18, 0x4E},
 598         { 0x18, 0x50},
 599         { 0x18, 0x52},
 600         { 0x18, 0x54},
 601         { 0x18, 0x56},
 602         { 0x18, 0x58},
 603         { 0x18, 0x5A},
 604         { 0x18, 0x5C},
 605         { 0x18, 0x5E},
 606         { 0x18, 0x60},
 607         { 0x18, 0x62},
 608         { 0x18, 0x64},
 609         { 0x18, 0x66},
 610         { 0x18, 0x68},
 611         { 0x18, 0x6A},
 612         { 0x18, 0x6C},
 613         { 0x18, 0x6E},
 614         { 0x18, 0x70},
 615         { 0x18, 0x72},
 616         { 0x18, 0x74},
 617         { 0x18, 0x76},
 618         { 0x18, 0x78},
 619         { 0x18, 0x7A},
 620         { 0x18, 0x7C},
 621         { 0x18, 0x7E}
 622 };
 623 static struct s_c2 SetRate48000[] =
 624 {
 625         { 0x14, 0x09},  // this line sets 48000, well actually a little less
 626         { 0x18, 0x40},  // only tascam / frontier design knows the further lines .......
 627         { 0x18, 0x42},
 628         { 0x18, 0x45},
 629         { 0x18, 0x46},
 630         { 0x18, 0x48},
 631         { 0x18, 0x4A},
 632         { 0x18, 0x4C},
 633         { 0x18, 0x4E},
 634         { 0x18, 0x50},
 635         { 0x18, 0x52},
 636         { 0x18, 0x54},
 637         { 0x18, 0x56},
 638         { 0x18, 0x58},
 639         { 0x18, 0x5A},
 640         { 0x18, 0x5C},
 641         { 0x18, 0x5E},
 642         { 0x18, 0x60},
 643         { 0x18, 0x62},
 644         { 0x18, 0x64},
 645         { 0x18, 0x66},
 646         { 0x18, 0x68},
 647         { 0x18, 0x6A},
 648         { 0x18, 0x6C},
 649         { 0x18, 0x6E},
 650         { 0x18, 0x70},
 651         { 0x18, 0x73},
 652         { 0x18, 0x74},
 653         { 0x18, 0x76},
 654         { 0x18, 0x78},
 655         { 0x18, 0x7A},
 656         { 0x18, 0x7C},
 657         { 0x18, 0x7E}
 658 };
 659 #define NOOF_SETRATE_URBS ARRAY_SIZE(SetRate48000)
 660
 661 static void i_usX2Y_04Int(struct urb *urb)
 662 {
 663         struct usX2Ydev *usX2Y = urb->context;
 664
 665         if (urb->status)
 666                 snd_printk(KERN_ERR "snd_usX2Y_04Int() urb->status=%i\n", urb->status);
 667         if (0 == --usX2Y->US04->len)
 668                 wake_up(&usX2Y->In04WaitQueue);
 669 }
 670
 671 static int usX2Y_rate_set(struct usX2Ydev *usX2Y, int rate)
 672 {
 673         int                     err = 0, i;
 674         struct snd_usX2Y_urbSeq *us = NULL;
 675         int                     *usbdata = NULL;
 676         struct s_c2             *ra = rate == 48000 ? SetRate48000 : SetRate44100;
 677
 678         if (usX2Y->rate != rate) {
 679                 us = kzalloc(sizeof(*us) + sizeof(struct urb*) * NOOF_SETRATE_URBS, GFP_KERNEL);
 680                 if (NULL == us) {
 681                         err = -ENOMEM;
 682                         goto cleanup;
 683                 }
 684                 usbdata = kmalloc(sizeof(int) * NOOF_SETRATE_URBS, GFP_KERNEL);
 685                 if (NULL == usbdata) {
 686                         err = -ENOMEM;
 687                         goto cleanup;
 688                 }
 689                 for (i = 0; i < NOOF_SETRATE_URBS; ++i) {
 690                         if (NULL == (us->urb[i] = usb_alloc_urb(0, GFP_KERNEL))) {
 691                                 err = -ENOMEM;
 692                                 goto cleanup;
 693                         }
 694                         ((char*)(usbdata + i))[0] = ra[i].c1;
 695                         ((char*)(usbdata + i))[1] = ra[i].c2;
 696                         usb_fill_bulk_urb(us->urb[i], usX2Y->dev, usb_sndbulkpipe(usX2Y->dev, 4),
 697                                           usbdata + i, 2, i_usX2Y_04Int, usX2Y);
 698 #ifdef OLD_USB
 699                         us->urb[i]->transfer_flags = USB_QUEUE_BULK;
 700 #endif
 701                 }
 702                 us->submitted = 0;
 703                 us->len =       NOOF_SETRATE_URBS;
 704                 usX2Y->US04 =   us;
 705                 wait_event_timeout(usX2Y->In04WaitQueue, 0 == us->len, HZ);
 706                 usX2Y->US04 =   NULL;
 707                 if (us->len)
 708                         err = -ENODEV;
 709         cleanup:
 710                 if (us) {
 711                         us->submitted = 2*NOOF_SETRATE_URBS;
 712                         for (i = 0; i < NOOF_SETRATE_URBS; ++i) {
 713                                 struct urb *urb = us->urb[i];
 714                                 if (urb->status) {
 715                                         if (!err)
 716                                                 err = -ENODEV;
 717                                         usb_kill_urb(urb);
 718                                 }
 719                                 usb_free_urb(urb);
 720                         }
 721                         usX2Y->US04 = NULL;
 722                         kfree(usbdata);
 723                         kfree(us);
 724                         if (!err)
 725                                 usX2Y->rate = rate;
 726                 }
 727         }
 728
 729         return err;
 730 }
 731
 732
 733 static int usX2Y_format_set(struct usX2Ydev *usX2Y, snd_pcm_format_t format)
 734 {
 735         int alternate, err;
 736         struct list_head* p;
 737         if (format == SNDRV_PCM_FORMAT_S24_3LE) {
 738                 alternate = 2;
 739                 usX2Y->stride = 6;
 740         } else {
 741                 alternate = 1;
 742                 usX2Y->stride = 4;
 743         }
 744         list_for_each(p, &usX2Y->midi_list) {
 745                 snd_usbmidi_input_stop(p);
 746         }
 747         usb_kill_urb(usX2Y->In04urb);
 748         if ((err = usb_set_interface(usX2Y->dev, 0, alternate))) {
 749                 snd_printk(KERN_ERR "usb_set_interface error \n");
 750                 return err;
 751         }
 752         usX2Y->In04urb->dev = usX2Y->dev;
 753         err = usb_submit_urb(usX2Y->In04urb, GFP_KERNEL);
 754         list_for_each(p, &usX2Y->midi_list) {
 755                 snd_usbmidi_input_start(p);
 756         }
 757         usX2Y->format = format;
 758         usX2Y->rate = 0;
 759         return err;
 760 }
 761
 762
 763 static int snd_usX2Y_pcm_hw_params(struct snd_pcm_substream *substream,
 764                                    struct snd_pcm_hw_params *hw_params)
 765 {
 766         int                     err = 0;
 767         unsigned int            rate = params_rate(hw_params);
 768         snd_pcm_format_t        format = params_format(hw_params);
 769         struct snd_card *card = substream->pstr->pcm->card;
 770         struct list_head *list;
 771
 772         snd_printdd("snd_usX2Y_hw_params(%p, %p)\n", substream, hw_params);
 773         // all pcm substreams off one usX2Y have to operate at the same rate & format
 774         list_for_each(list, &card->devices) {
 775                 struct snd_device *dev;
 776                 struct snd_pcm *pcm;
 777                 int s;
 778                 dev = snd_device(list);
 779                 if (dev->type != SNDRV_DEV_PCM)
 780                         continue;
 781                 pcm = dev->device_data;
 782                 for (s = 0; s < 2; ++s) {
 783                         struct snd_pcm_substream *test_substream;
 784                         test_substream = pcm->streams[s].substream;
 785                         if (test_substream && test_substream != substream  &&
 786                             test_substream->runtime &&
 787                             ((test_substream->runtime->format &&
 788                               test_substream->runtime->format != format) ||
 789                              (test_substream->runtime->rate &&
 790                               test_substream->runtime->rate != rate)))
 791                                 return -EINVAL;
 792                 }
 793         }
 794         if (0 > (err = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params)))) {
 795                 snd_printk(KERN_ERR "snd_pcm_lib_malloc_pages(%p, %i) returned %i\n",
 796                            substream, params_buffer_bytes(hw_params), err);
 797                 return err;
 798         }
 799         return 0;
 800 }
 801
 802 /*
 803  * free the buffer
 804  */
 805 static int snd_usX2Y_pcm_hw_free(struct snd_pcm_substream *substream)
 806 {
 807         struct snd_pcm_runtime *runtime = substream->runtime;
 808         struct snd_usX2Y_substream *subs = runtime->private_data;
 809         mutex_lock(&subs->usX2Y->prepare_mutex);
 810         snd_printdd("snd_usX2Y_hw_free(%p)\n", substream);
 811
 812         if (SNDRV_PCM_STREAM_PLAYBACK == substream->stream) {
 813                 struct snd_usX2Y_substream *cap_subs = subs->usX2Y->subs[SNDRV_PCM_STREAM_CAPTURE];
 814                 atomic_set(&subs->state, state_STOPPED);
 815                 usX2Y_urbs_release(subs);
 816                 if (!cap_subs->pcm_substream ||
 817                     !cap_subs->pcm_substream->runtime ||
 818                     !cap_subs->pcm_substream->runtime->status ||
 819                     cap_subs->pcm_substream->runtime->status->state < SNDRV_PCM_STATE_PREPARED) {
 820                         atomic_set(&cap_subs->state, state_STOPPED);
 821                         usX2Y_urbs_release(cap_subs);
 822                 }
 823         } else {
 824                 struct snd_usX2Y_substream *playback_subs = subs->usX2Y->subs[SNDRV_PCM_STREAM_PLAYBACK];
 825                 if (atomic_read(&playback_subs->state) < state_PREPARED) {
 826                         atomic_set(&subs->state, state_STOPPED);
 827                         usX2Y_urbs_release(subs);
 828                 }
 829         }
 830         mutex_unlock(&subs->usX2Y->prepare_mutex);
 831         return snd_pcm_lib_free_pages(substream);
 832 }
 833 /*
 834  * prepare callback
 835  *
 836  * set format and initialize urbs
 837  */
 838 static int snd_usX2Y_pcm_prepare(struct snd_pcm_substream *substream)
 839 {
 840         struct snd_pcm_runtime *runtime = substream->runtime;
 841         struct snd_usX2Y_substream *subs = runtime->private_data;
 842         struct usX2Ydev *usX2Y = subs->usX2Y;
 843         struct snd_usX2Y_substream *capsubs = subs->usX2Y->subs[SNDRV_PCM_STREAM_CAPTURE];
 844         int err = 0;
 845         snd_printdd("snd_usX2Y_pcm_prepare(%p)\n", substream);
 846
 847         mutex_lock(&usX2Y->prepare_mutex);
 848         usX2Y_subs_prepare(subs);
 849 // Start hardware streams
 850 // SyncStream first....
 851         if (atomic_read(&capsubs->state) < state_PREPARED) {
 852                 if (usX2Y->format != runtime->format)
 853                         if ((err = usX2Y_format_set(usX2Y, runtime->format)) < 0)
 854                                 goto up_prepare_mutex;
 855                 if (usX2Y->rate != runtime->rate)
 856                         if ((err = usX2Y_rate_set(usX2Y, runtime->rate)) < 0)
 857                                 goto up_prepare_mutex;
 858                 snd_printdd("starting capture pipe for %s\n", subs == capsubs ? "self" : "playpipe");
 859                 if (0 > (err = usX2Y_urbs_start(capsubs)))
 860                         goto up_prepare_mutex;
 861         }
 862
 863         if (subs != capsubs && atomic_read(&subs->state) < state_PREPARED)
 864                 err = usX2Y_urbs_start(subs);
 865
 866  up_prepare_mutex:
 867         mutex_unlock(&usX2Y->prepare_mutex);
 868         return err;
 869 }
 870
 871 static struct snd_pcm_hardware snd_usX2Y_2c =
 872 {
 873         .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
 874                                  SNDRV_PCM_INFO_BLOCK_TRANSFER |
 875                                  SNDRV_PCM_INFO_MMAP_VALID |
 876                                  SNDRV_PCM_INFO_BATCH),
 877         .formats =                 SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_3LE,
 878         .rates =                   SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000,
 879         .rate_min =                44100,
 880         .rate_max =                48000,
 881         .channels_min =            2,
 882         .channels_max =            2,
 883         .buffer_bytes_max =     (2*128*1024),
 884         .period_bytes_min =     64,
 885         .period_bytes_max =     (128*1024),
 886         .periods_min =          2,
 887         .periods_max =          1024,
 888         .fifo_size =              0
 889 };
 890
 891
 892
 893 static int snd_usX2Y_pcm_open(struct snd_pcm_substream *substream)
 894 {
 895         struct snd_usX2Y_substream      *subs = ((struct snd_usX2Y_substream **)
 896                                          snd_pcm_substream_chip(substream))[substream->stream];
 897         struct snd_pcm_runtime  *runtime = substream->runtime;
 898
 899         if (subs->usX2Y->chip_status & USX2Y_STAT_CHIP_MMAP_PCM_URBS)
 900                 return -EBUSY;
 901
 902         runtime->hw = snd_usX2Y_2c;
 903         runtime->private_data = subs;
 904         subs->pcm_substream = substream;
 905         snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 1000, 200000);
 906         return 0;
 907 }
 908
 909
 910
 911 static int snd_usX2Y_pcm_close(struct snd_pcm_substream *substream)
 912 {
 913         struct snd_pcm_runtime *runtime = substream->runtime;
 914         struct snd_usX2Y_substream *subs = runtime->private_data;
 915
 916         subs->pcm_substream = NULL;
 917
 918         return 0;
 919 }
 920
 921
 922 static struct snd_pcm_ops snd_usX2Y_pcm_ops =
 923 {
 924         .open =         snd_usX2Y_pcm_open,
 925         .close =        snd_usX2Y_pcm_close,
 926         .ioctl =        snd_pcm_lib_ioctl,
 927         .hw_params =    snd_usX2Y_pcm_hw_params,
 928         .hw_free =      snd_usX2Y_pcm_hw_free,
 929         .prepare =      snd_usX2Y_pcm_prepare,
 930         .trigger =      snd_usX2Y_pcm_trigger,
 931         .pointer =      snd_usX2Y_pcm_pointer,
 932 };
 933
 934
 935 /*
 936  * free a usb stream instance
 937  */
 938 static void usX2Y_audio_stream_free(struct snd_usX2Y_substream **usX2Y_substream)
 939 {
 940         kfree(usX2Y_substream[SNDRV_PCM_STREAM_PLAYBACK]);
 941         usX2Y_substream[SNDRV_PCM_STREAM_PLAYBACK] = NULL;
 942
 943         kfree(usX2Y_substream[SNDRV_PCM_STREAM_CAPTURE]);
 944         usX2Y_substream[SNDRV_PCM_STREAM_CAPTURE] = NULL;
 945 }
 946
 947 static void snd_usX2Y_pcm_private_free(struct snd_pcm *pcm)
 948 {
 949         struct snd_usX2Y_substream **usX2Y_stream = pcm->private_data;
 950         if (usX2Y_stream)
 951                 usX2Y_audio_stream_free(usX2Y_stream);
 952 }
 953
 954 static int usX2Y_audio_stream_new(struct snd_card *card, int playback_endpoint, int capture_endpoint)
 955 {
 956         struct snd_pcm *pcm;
 957         int err, i;
 958         struct snd_usX2Y_substream **usX2Y_substream =
 959                 usX2Y(card)->subs + 2 * usX2Y(card)->pcm_devs;
 960
 961         for (i = playback_endpoint ? SNDRV_PCM_STREAM_PLAYBACK : SNDRV_PCM_STREAM_CAPTURE;
 962              i <= SNDRV_PCM_STREAM_CAPTURE; ++i) {
 963                 usX2Y_substream[i] = kzalloc(sizeof(struct snd_usX2Y_substream), GFP_KERNEL);
 964                 if (NULL == usX2Y_substream[i]) {
 965                         snd_printk(KERN_ERR "cannot malloc\n");
 966                         return -ENOMEM;
 967                 }
 968                 usX2Y_substream[i]->usX2Y = usX2Y(card);
 969         }
 970
 971         if (playback_endpoint)
 972                 usX2Y_substream[SNDRV_PCM_STREAM_PLAYBACK]->endpoint = playback_endpoint;
 973         usX2Y_substream[SNDRV_PCM_STREAM_CAPTURE]->endpoint = capture_endpoint;
 974
 975         err = snd_pcm_new(card, NAME_ALLCAPS" Audio", usX2Y(card)->pcm_devs,
 976                           playback_endpoint ? 1 : 0, 1,
 977                           &pcm);
 978         if (err < 0) {
 979                 usX2Y_audio_stream_free(usX2Y_substream);
 980                 return err;
 981         }
 982
 983         if (playback_endpoint)
 984                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_usX2Y_pcm_ops);
 985         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_usX2Y_pcm_ops);
 986
 987         pcm->private_data = usX2Y_substream;
 988         pcm->private_free = snd_usX2Y_pcm_private_free;
 989         pcm->info_flags = 0;
 990
 991         sprintf(pcm->name, NAME_ALLCAPS" Audio #%d", usX2Y(card)->pcm_devs);
 992
 993         if ((playback_endpoint &&
 994              0 > (err = snd_pcm_lib_preallocate_pages(pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream,
 995                                                      SNDRV_DMA_TYPE_CONTINUOUS,
 996                                                      snd_dma_continuous_data(GFP_KERNEL),
 997                                                      64*1024, 128*1024))) ||
 998             0 > (err = snd_pcm_lib_preallocate_pages(pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream,
 999                                                      SNDRV_DMA_TYPE_CONTINUOUS,
1000                                                      snd_dma_continuous_data(GFP_KERNEL),
1001                                                      64*1024, 128*1024))) {
1002                 snd_usX2Y_pcm_private_free(pcm);
1003                 return err;
1004         }
1005         usX2Y(card)->pcm_devs++;
1006
1007         return 0;
1008 }
1009
1010 /*
1011  * create a chip instance and set its names.
1012  */
1013 int usX2Y_audio_create(struct snd_card *card)
1014 {
1015         int err = 0;
1016
1017         INIT_LIST_HEAD(&usX2Y(card)->pcm_list);
1018
1019         if (0 > (err = usX2Y_audio_stream_new(card, 0xA, 0x8)))
1020                 return err;
1021         if (le16_to_cpu(usX2Y(card)->dev->descriptor.idProduct) == USB_ID_US428)
1022              if (0 > (err = usX2Y_audio_stream_new(card, 0, 0xA)))
1023                      return err;
1024         if (le16_to_cpu(usX2Y(card)->dev->descriptor.idProduct) != USB_ID_US122)
1025                 err = usX2Y_rate_set(usX2Y(card), 44100);       // Lets us428 recognize output-volume settings, disturbs us122.
1026         return err;
1027 }