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TOMOYO Linux Cross Reference
Linux/sound/usb/usx2y/usbusx2yaudio.c

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  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_xrun(subs->pcm_substream);
277                         for (u = 0; u < NRURBS; u++) {
278                                 struct urb *urb = subs->urb[u];
279                                 if (NULL != urb)
280                                         snd_printdd("%i status=%i start_frame=%i\n",
281                                                     u, urb->status, urb->start_frame);
282                         }
283                 }
284         }
285         usX2Y->prepare_subs = NULL;
286         wake_up(&usX2Y->prepare_wait_queue);
287 }
288 
289 static void usX2Y_error_urb_status(struct usX2Ydev *usX2Y,
290                                    struct snd_usX2Y_substream *subs, struct urb *urb)
291 {
292         snd_printk(KERN_ERR "ep=%i stalled with status=%i\n", subs->endpoint, urb->status);
293         urb->status = 0;
294         usX2Y_clients_stop(usX2Y);
295 }
296 
297 static void i_usX2Y_urb_complete(struct urb *urb)
298 {
299         struct snd_usX2Y_substream *subs = urb->context;
300         struct usX2Ydev *usX2Y = subs->usX2Y;
301 
302         if (unlikely(atomic_read(&subs->state) < state_PREPARED)) {
303                 snd_printdd("hcd_frame=%i ep=%i%s status=%i start_frame=%i\n",
304                             usb_get_current_frame_number(usX2Y->dev),
305                             subs->endpoint, usb_pipein(urb->pipe) ? "in" : "out",
306                             urb->status, urb->start_frame);
307                 return;
308         }
309         if (unlikely(urb->status)) {
310                 usX2Y_error_urb_status(usX2Y, subs, urb);
311                 return;
312         }
313 
314         subs->completed_urb = urb;
315 
316         {
317                 struct snd_usX2Y_substream *capsubs = usX2Y->subs[SNDRV_PCM_STREAM_CAPTURE],
318                         *playbacksubs = usX2Y->subs[SNDRV_PCM_STREAM_PLAYBACK];
319                 if (capsubs->completed_urb &&
320                     atomic_read(&capsubs->state) >= state_PREPARED &&
321                     (playbacksubs->completed_urb ||
322                      atomic_read(&playbacksubs->state) < state_PREPARED)) {
323                         if (!usX2Y_usbframe_complete(capsubs, playbacksubs, urb->start_frame))
324                                 usX2Y->wait_iso_frame += nr_of_packs();
325                         else {
326                                 snd_printdd("\n");
327                                 usX2Y_clients_stop(usX2Y);
328                         }
329                 }
330         }
331 }
332 
333 static void usX2Y_urbs_set_complete(struct usX2Ydev * usX2Y,
334                                     void (*complete)(struct urb *))
335 {
336         int s, u;
337         for (s = 0; s < 4; s++) {
338                 struct snd_usX2Y_substream *subs = usX2Y->subs[s];
339                 if (NULL != subs)
340                         for (u = 0; u < NRURBS; u++) {
341                                 struct urb * urb = subs->urb[u];
342                                 if (NULL != urb)
343                                         urb->complete = complete;
344                         }
345         }
346 }
347 
348 static void usX2Y_subs_startup_finish(struct usX2Ydev * usX2Y)
349 {
350         usX2Y_urbs_set_complete(usX2Y, i_usX2Y_urb_complete);
351         usX2Y->prepare_subs = NULL;
352 }
353 
354 static void i_usX2Y_subs_startup(struct urb *urb)
355 {
356         struct snd_usX2Y_substream *subs = urb->context;
357         struct usX2Ydev *usX2Y = subs->usX2Y;
358         struct snd_usX2Y_substream *prepare_subs = usX2Y->prepare_subs;
359         if (NULL != prepare_subs)
360                 if (urb->start_frame == prepare_subs->urb[0]->start_frame) {
361                         usX2Y_subs_startup_finish(usX2Y);
362                         atomic_inc(&prepare_subs->state);
363                         wake_up(&usX2Y->prepare_wait_queue);
364                 }
365 
366         i_usX2Y_urb_complete(urb);
367 }
368 
369 static void usX2Y_subs_prepare(struct snd_usX2Y_substream *subs)
370 {
371         snd_printdd("usX2Y_substream_prepare(%p) ep=%i urb0=%p urb1=%p\n",
372                     subs, subs->endpoint, subs->urb[0], subs->urb[1]);
373         /* reset the pointer */
374         subs->hwptr = 0;
375         subs->hwptr_done = 0;
376         subs->transfer_done = 0;
377 }
378 
379 
380 static void usX2Y_urb_release(struct urb **urb, int free_tb)
381 {
382         if (*urb) {
383                 usb_kill_urb(*urb);
384                 if (free_tb)
385                         kfree((*urb)->transfer_buffer);
386                 usb_free_urb(*urb);
387                 *urb = NULL;
388         }
389 }
390 /*
391  * release a substreams urbs
392  */
393 static void usX2Y_urbs_release(struct snd_usX2Y_substream *subs)
394 {
395         int i;
396         snd_printdd("usX2Y_urbs_release() %i\n", subs->endpoint);
397         for (i = 0; i < NRURBS; i++)
398                 usX2Y_urb_release(subs->urb + i,
399                                   subs != subs->usX2Y->subs[SNDRV_PCM_STREAM_PLAYBACK]);
400 
401         kfree(subs->tmpbuf);
402         subs->tmpbuf = NULL;
403 }
404 /*
405  * initialize a substream's urbs
406  */
407 static int usX2Y_urbs_allocate(struct snd_usX2Y_substream *subs)
408 {
409         int i;
410         unsigned int pipe;
411         int is_playback = subs == subs->usX2Y->subs[SNDRV_PCM_STREAM_PLAYBACK];
412         struct usb_device *dev = subs->usX2Y->dev;
413 
414         pipe = is_playback ? usb_sndisocpipe(dev, subs->endpoint) :
415                         usb_rcvisocpipe(dev, subs->endpoint);
416         subs->maxpacksize = usb_maxpacket(dev, pipe, is_playback);
417         if (!subs->maxpacksize)
418                 return -EINVAL;
419 
420         if (is_playback && NULL == subs->tmpbuf) {      /* allocate a temporary buffer for playback */
421                 subs->tmpbuf = kcalloc(nr_of_packs(), subs->maxpacksize, GFP_KERNEL);
422                 if (!subs->tmpbuf)
423                         return -ENOMEM;
424         }
425         /* allocate and initialize data urbs */
426         for (i = 0; i < NRURBS; i++) {
427                 struct urb **purb = subs->urb + i;
428                 if (*purb) {
429                         usb_kill_urb(*purb);
430                         continue;
431                 }
432                 *purb = usb_alloc_urb(nr_of_packs(), GFP_KERNEL);
433                 if (NULL == *purb) {
434                         usX2Y_urbs_release(subs);
435                         return -ENOMEM;
436                 }
437                 if (!is_playback && !(*purb)->transfer_buffer) {
438                         /* allocate a capture buffer per urb */
439                         (*purb)->transfer_buffer = kmalloc(subs->maxpacksize * nr_of_packs(), GFP_KERNEL);
440                         if (NULL == (*purb)->transfer_buffer) {
441                                 usX2Y_urbs_release(subs);
442                                 return -ENOMEM;
443                         }
444                 }
445                 (*purb)->dev = dev;
446                 (*purb)->pipe = pipe;
447                 (*purb)->number_of_packets = nr_of_packs();
448                 (*purb)->context = subs;
449                 (*purb)->interval = 1;
450                 (*purb)->complete = i_usX2Y_subs_startup;
451         }
452         return 0;
453 }
454 
455 static void usX2Y_subs_startup(struct snd_usX2Y_substream *subs)
456 {
457         struct usX2Ydev *usX2Y = subs->usX2Y;
458         usX2Y->prepare_subs = subs;
459         subs->urb[0]->start_frame = -1;
460         wmb();
461         usX2Y_urbs_set_complete(usX2Y, i_usX2Y_subs_startup);
462 }
463 
464 static int usX2Y_urbs_start(struct snd_usX2Y_substream *subs)
465 {
466         int i, err;
467         struct usX2Ydev *usX2Y = subs->usX2Y;
468 
469         if ((err = usX2Y_urbs_allocate(subs)) < 0)
470                 return err;
471         subs->completed_urb = NULL;
472         for (i = 0; i < 4; i++) {
473                 struct snd_usX2Y_substream *subs = usX2Y->subs[i];
474                 if (subs != NULL && atomic_read(&subs->state) >= state_PREPARED)
475                         goto start;
476         }
477 
478  start:
479         usX2Y_subs_startup(subs);
480         for (i = 0; i < NRURBS; i++) {
481                 struct urb *urb = subs->urb[i];
482                 if (usb_pipein(urb->pipe)) {
483                         unsigned long pack;
484                         if (0 == i)
485                                 atomic_set(&subs->state, state_STARTING3);
486                         urb->dev = usX2Y->dev;
487                         for (pack = 0; pack < nr_of_packs(); pack++) {
488                                 urb->iso_frame_desc[pack].offset = subs->maxpacksize * pack;
489                                 urb->iso_frame_desc[pack].length = subs->maxpacksize;
490                         }
491                         urb->transfer_buffer_length = subs->maxpacksize * nr_of_packs(); 
492                         if ((err = usb_submit_urb(urb, GFP_ATOMIC)) < 0) {
493                                 snd_printk (KERN_ERR "cannot submit datapipe for urb %d, err = %d\n", i, err);
494                                 err = -EPIPE;
495                                 goto cleanup;
496                         } else
497                                 if (i == 0)
498                                         usX2Y->wait_iso_frame = urb->start_frame;
499                         urb->transfer_flags = 0;
500                 } else {
501                         atomic_set(&subs->state, state_STARTING1);
502                         break;
503                 }
504         }
505         err = 0;
506         wait_event(usX2Y->prepare_wait_queue, NULL == usX2Y->prepare_subs);
507         if (atomic_read(&subs->state) != state_PREPARED)
508                 err = -EPIPE;
509 
510  cleanup:
511         if (err) {
512                 usX2Y_subs_startup_finish(usX2Y);
513                 usX2Y_clients_stop(usX2Y);              // something is completely wroong > stop evrything
514         }
515         return err;
516 }
517 
518 /*
519  * return the current pcm pointer.  just return the hwptr_done value.
520  */
521 static snd_pcm_uframes_t snd_usX2Y_pcm_pointer(struct snd_pcm_substream *substream)
522 {
523         struct snd_usX2Y_substream *subs = substream->runtime->private_data;
524         return subs->hwptr_done;
525 }
526 /*
527  * start/stop substream
528  */
529 static int snd_usX2Y_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
530 {
531         struct snd_usX2Y_substream *subs = substream->runtime->private_data;
532 
533         switch (cmd) {
534         case SNDRV_PCM_TRIGGER_START:
535                 snd_printdd("snd_usX2Y_pcm_trigger(START)\n");
536                 if (atomic_read(&subs->state) == state_PREPARED &&
537                     atomic_read(&subs->usX2Y->subs[SNDRV_PCM_STREAM_CAPTURE]->state) >= state_PREPARED) {
538                         atomic_set(&subs->state, state_PRERUNNING);
539                 } else {
540                         snd_printdd("\n");
541                         return -EPIPE;
542                 }
543                 break;
544         case SNDRV_PCM_TRIGGER_STOP:
545                 snd_printdd("snd_usX2Y_pcm_trigger(STOP)\n");
546                 if (atomic_read(&subs->state) >= state_PRERUNNING)
547                         atomic_set(&subs->state, state_PREPARED);
548                 break;
549         default:
550                 return -EINVAL;
551         }
552         return 0;
553 }
554 
555 
556 /*
557  * allocate a buffer, setup samplerate
558  *
559  * so far we use a physically linear buffer although packetize transfer
560  * doesn't need a continuous area.
561  * if sg buffer is supported on the later version of alsa, we'll follow
562  * that.
563  */
564 static struct s_c2
565 {
566         char c1, c2;
567 }
568         SetRate44100[] =
569 {
570         { 0x14, 0x08},  // this line sets 44100, well actually a little less
571         { 0x18, 0x40},  // only tascam / frontier design knows the further lines .......
572         { 0x18, 0x42},
573         { 0x18, 0x45},
574         { 0x18, 0x46},
575         { 0x18, 0x48},
576         { 0x18, 0x4A},
577         { 0x18, 0x4C},
578         { 0x18, 0x4E},
579         { 0x18, 0x50},
580         { 0x18, 0x52},
581         { 0x18, 0x54},
582         { 0x18, 0x56},
583         { 0x18, 0x58},
584         { 0x18, 0x5A},
585         { 0x18, 0x5C},
586         { 0x18, 0x5E},
587         { 0x18, 0x60},
588         { 0x18, 0x62},
589         { 0x18, 0x64},
590         { 0x18, 0x66},
591         { 0x18, 0x68},
592         { 0x18, 0x6A},
593         { 0x18, 0x6C},
594         { 0x18, 0x6E},
595         { 0x18, 0x70},
596         { 0x18, 0x72},
597         { 0x18, 0x74},
598         { 0x18, 0x76},
599         { 0x18, 0x78},
600         { 0x18, 0x7A},
601         { 0x18, 0x7C},
602         { 0x18, 0x7E}
603 };
604 static struct s_c2 SetRate48000[] =
605 {
606         { 0x14, 0x09},  // this line sets 48000, well actually a little less
607         { 0x18, 0x40},  // only tascam / frontier design knows the further lines .......
608         { 0x18, 0x42},
609         { 0x18, 0x45},
610         { 0x18, 0x46},
611         { 0x18, 0x48},
612         { 0x18, 0x4A},
613         { 0x18, 0x4C},
614         { 0x18, 0x4E},
615         { 0x18, 0x50},
616         { 0x18, 0x52},
617         { 0x18, 0x54},
618         { 0x18, 0x56},
619         { 0x18, 0x58},
620         { 0x18, 0x5A},
621         { 0x18, 0x5C},
622         { 0x18, 0x5E},
623         { 0x18, 0x60},
624         { 0x18, 0x62},
625         { 0x18, 0x64},
626         { 0x18, 0x66},
627         { 0x18, 0x68},
628         { 0x18, 0x6A},
629         { 0x18, 0x6C},
630         { 0x18, 0x6E},
631         { 0x18, 0x70},
632         { 0x18, 0x73},
633         { 0x18, 0x74},
634         { 0x18, 0x76},
635         { 0x18, 0x78},
636         { 0x18, 0x7A},
637         { 0x18, 0x7C},
638         { 0x18, 0x7E}
639 };
640 #define NOOF_SETRATE_URBS ARRAY_SIZE(SetRate48000)
641 
642 static void i_usX2Y_04Int(struct urb *urb)
643 {
644         struct usX2Ydev *usX2Y = urb->context;
645         
646         if (urb->status)
647                 snd_printk(KERN_ERR "snd_usX2Y_04Int() urb->status=%i\n", urb->status);
648         if (0 == --usX2Y->US04->len)
649                 wake_up(&usX2Y->In04WaitQueue);
650 }
651 
652 static int usX2Y_rate_set(struct usX2Ydev *usX2Y, int rate)
653 {
654         int                     err = 0, i;
655         struct snd_usX2Y_urbSeq *us = NULL;
656         int                     *usbdata = NULL;
657         struct s_c2             *ra = rate == 48000 ? SetRate48000 : SetRate44100;
658 
659         if (usX2Y->rate != rate) {
660                 us = kzalloc(sizeof(*us) + sizeof(struct urb*) * NOOF_SETRATE_URBS, GFP_KERNEL);
661                 if (NULL == us) {
662                         err = -ENOMEM;
663                         goto cleanup;
664                 }
665                 usbdata = kmalloc(sizeof(int) * NOOF_SETRATE_URBS, GFP_KERNEL);
666                 if (NULL == usbdata) {
667                         err = -ENOMEM;
668                         goto cleanup;
669                 }
670                 for (i = 0; i < NOOF_SETRATE_URBS; ++i) {
671                         if (NULL == (us->urb[i] = usb_alloc_urb(0, GFP_KERNEL))) {
672                                 err = -ENOMEM;
673                                 goto cleanup;
674                         }
675                         ((char*)(usbdata + i))[0] = ra[i].c1;
676                         ((char*)(usbdata + i))[1] = ra[i].c2;
677                         usb_fill_bulk_urb(us->urb[i], usX2Y->dev, usb_sndbulkpipe(usX2Y->dev, 4),
678                                           usbdata + i, 2, i_usX2Y_04Int, usX2Y);
679                 }
680                 err = usb_urb_ep_type_check(us->urb[0]);
681                 if (err < 0)
682                         goto cleanup;
683                 us->submitted = 0;
684                 us->len =       NOOF_SETRATE_URBS;
685                 usX2Y->US04 =   us;
686                 wait_event_timeout(usX2Y->In04WaitQueue, 0 == us->len, HZ);
687                 usX2Y->US04 =   NULL;
688                 if (us->len)
689                         err = -ENODEV;
690         cleanup:
691                 if (us) {
692                         us->submitted = 2*NOOF_SETRATE_URBS;
693                         for (i = 0; i < NOOF_SETRATE_URBS; ++i) {
694                                 struct urb *urb = us->urb[i];
695                                 if (urb->status) {
696                                         if (!err)
697                                                 err = -ENODEV;
698                                         usb_kill_urb(urb);
699                                 }
700                                 usb_free_urb(urb);
701                         }
702                         usX2Y->US04 = NULL;
703                         kfree(usbdata);
704                         kfree(us);
705                         if (!err)
706                                 usX2Y->rate = rate;
707                 }
708         }
709 
710         return err;
711 }
712 
713 
714 static int usX2Y_format_set(struct usX2Ydev *usX2Y, snd_pcm_format_t format)
715 {
716         int alternate, err;
717         struct list_head* p;
718         if (format == SNDRV_PCM_FORMAT_S24_3LE) {
719                 alternate = 2;
720                 usX2Y->stride = 6;
721         } else {
722                 alternate = 1;
723                 usX2Y->stride = 4;
724         }
725         list_for_each(p, &usX2Y->midi_list) {
726                 snd_usbmidi_input_stop(p);
727         }
728         usb_kill_urb(usX2Y->In04urb);
729         if ((err = usb_set_interface(usX2Y->dev, 0, alternate))) {
730                 snd_printk(KERN_ERR "usb_set_interface error \n");
731                 return err;
732         }
733         usX2Y->In04urb->dev = usX2Y->dev;
734         err = usb_submit_urb(usX2Y->In04urb, GFP_KERNEL);
735         list_for_each(p, &usX2Y->midi_list) {
736                 snd_usbmidi_input_start(p);
737         }
738         usX2Y->format = format;
739         usX2Y->rate = 0;
740         return err;
741 }
742 
743 
744 static int snd_usX2Y_pcm_hw_params(struct snd_pcm_substream *substream,
745                                    struct snd_pcm_hw_params *hw_params)
746 {
747         int                     err = 0;
748         unsigned int            rate = params_rate(hw_params);
749         snd_pcm_format_t        format = params_format(hw_params);
750         struct snd_card *card = substream->pstr->pcm->card;
751         struct usX2Ydev *dev = usX2Y(card);
752         int i;
753 
754         mutex_lock(&usX2Y(card)->pcm_mutex);
755         snd_printdd("snd_usX2Y_hw_params(%p, %p)\n", substream, hw_params);
756         /* all pcm substreams off one usX2Y have to operate at the same
757          * rate & format
758          */
759         for (i = 0; i < dev->pcm_devs * 2; i++) {
760                 struct snd_usX2Y_substream *subs = dev->subs[i];
761                 struct snd_pcm_substream *test_substream;
762 
763                 if (!subs)
764                         continue;
765                 test_substream = subs->pcm_substream;
766                 if (!test_substream || test_substream == substream ||
767                     !test_substream->runtime)
768                         continue;
769                 if ((test_substream->runtime->format &&
770                      test_substream->runtime->format != format) ||
771                     (test_substream->runtime->rate &&
772                      test_substream->runtime->rate != rate)) {
773                         err = -EINVAL;
774                         goto error;
775                 }
776         }
777 
778         err = snd_pcm_lib_malloc_pages(substream,
779                                        params_buffer_bytes(hw_params));
780         if (err < 0) {
781                 snd_printk(KERN_ERR "snd_pcm_lib_malloc_pages(%p, %i) returned %i\n",
782                            substream, params_buffer_bytes(hw_params), err);
783                 goto error;
784         }
785 
786  error:
787         mutex_unlock(&usX2Y(card)->pcm_mutex);
788         return err;
789 }
790 
791 /*
792  * free the buffer
793  */
794 static int snd_usX2Y_pcm_hw_free(struct snd_pcm_substream *substream)
795 {
796         struct snd_pcm_runtime *runtime = substream->runtime;
797         struct snd_usX2Y_substream *subs = runtime->private_data;
798         mutex_lock(&subs->usX2Y->pcm_mutex);
799         snd_printdd("snd_usX2Y_hw_free(%p)\n", substream);
800 
801         if (SNDRV_PCM_STREAM_PLAYBACK == substream->stream) {
802                 struct snd_usX2Y_substream *cap_subs = subs->usX2Y->subs[SNDRV_PCM_STREAM_CAPTURE];
803                 atomic_set(&subs->state, state_STOPPED);
804                 usX2Y_urbs_release(subs);
805                 if (!cap_subs->pcm_substream ||
806                     !cap_subs->pcm_substream->runtime ||
807                     !cap_subs->pcm_substream->runtime->status ||
808                     cap_subs->pcm_substream->runtime->status->state < SNDRV_PCM_STATE_PREPARED) {
809                         atomic_set(&cap_subs->state, state_STOPPED);
810                         usX2Y_urbs_release(cap_subs);
811                 }
812         } else {
813                 struct snd_usX2Y_substream *playback_subs = subs->usX2Y->subs[SNDRV_PCM_STREAM_PLAYBACK];
814                 if (atomic_read(&playback_subs->state) < state_PREPARED) {
815                         atomic_set(&subs->state, state_STOPPED);
816                         usX2Y_urbs_release(subs);
817                 }
818         }
819         mutex_unlock(&subs->usX2Y->pcm_mutex);
820         return snd_pcm_lib_free_pages(substream);
821 }
822 /*
823  * prepare callback
824  *
825  * set format and initialize urbs
826  */
827 static int snd_usX2Y_pcm_prepare(struct snd_pcm_substream *substream)
828 {
829         struct snd_pcm_runtime *runtime = substream->runtime;
830         struct snd_usX2Y_substream *subs = runtime->private_data;
831         struct usX2Ydev *usX2Y = subs->usX2Y;
832         struct snd_usX2Y_substream *capsubs = subs->usX2Y->subs[SNDRV_PCM_STREAM_CAPTURE];
833         int err = 0;
834         snd_printdd("snd_usX2Y_pcm_prepare(%p)\n", substream);
835 
836         mutex_lock(&usX2Y->pcm_mutex);
837         usX2Y_subs_prepare(subs);
838 // Start hardware streams
839 // SyncStream first....
840         if (atomic_read(&capsubs->state) < state_PREPARED) {
841                 if (usX2Y->format != runtime->format)
842                         if ((err = usX2Y_format_set(usX2Y, runtime->format)) < 0)
843                                 goto up_prepare_mutex;
844                 if (usX2Y->rate != runtime->rate)
845                         if ((err = usX2Y_rate_set(usX2Y, runtime->rate)) < 0)
846                                 goto up_prepare_mutex;
847                 snd_printdd("starting capture pipe for %s\n", subs == capsubs ? "self" : "playpipe");
848                 if (0 > (err = usX2Y_urbs_start(capsubs)))
849                         goto up_prepare_mutex;
850         }
851 
852         if (subs != capsubs && atomic_read(&subs->state) < state_PREPARED)
853                 err = usX2Y_urbs_start(subs);
854 
855  up_prepare_mutex:
856         mutex_unlock(&usX2Y->pcm_mutex);
857         return err;
858 }
859 
860 static struct snd_pcm_hardware snd_usX2Y_2c =
861 {
862         .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
863                                  SNDRV_PCM_INFO_BLOCK_TRANSFER |
864                                  SNDRV_PCM_INFO_MMAP_VALID |
865                                  SNDRV_PCM_INFO_BATCH),
866         .formats =                 SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_3LE,
867         .rates =                   SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000,
868         .rate_min =                44100,
869         .rate_max =                48000,
870         .channels_min =            2,
871         .channels_max =            2,
872         .buffer_bytes_max =     (2*128*1024),
873         .period_bytes_min =     64,
874         .period_bytes_max =     (128*1024),
875         .periods_min =          2,
876         .periods_max =          1024,
877         .fifo_size =              0
878 };
879 
880 
881 
882 static int snd_usX2Y_pcm_open(struct snd_pcm_substream *substream)
883 {
884         struct snd_usX2Y_substream      *subs = ((struct snd_usX2Y_substream **)
885                                          snd_pcm_substream_chip(substream))[substream->stream];
886         struct snd_pcm_runtime  *runtime = substream->runtime;
887 
888         if (subs->usX2Y->chip_status & USX2Y_STAT_CHIP_MMAP_PCM_URBS)
889                 return -EBUSY;
890 
891         runtime->hw = snd_usX2Y_2c;
892         runtime->private_data = subs;
893         subs->pcm_substream = substream;
894         snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 1000, 200000);
895         return 0;
896 }
897 
898 
899 
900 static int snd_usX2Y_pcm_close(struct snd_pcm_substream *substream)
901 {
902         struct snd_pcm_runtime *runtime = substream->runtime;
903         struct snd_usX2Y_substream *subs = runtime->private_data;
904 
905         subs->pcm_substream = NULL;
906 
907         return 0;
908 }
909 
910 
911 static const struct snd_pcm_ops snd_usX2Y_pcm_ops =
912 {
913         .open =         snd_usX2Y_pcm_open,
914         .close =        snd_usX2Y_pcm_close,
915         .ioctl =        snd_pcm_lib_ioctl,
916         .hw_params =    snd_usX2Y_pcm_hw_params,
917         .hw_free =      snd_usX2Y_pcm_hw_free,
918         .prepare =      snd_usX2Y_pcm_prepare,
919         .trigger =      snd_usX2Y_pcm_trigger,
920         .pointer =      snd_usX2Y_pcm_pointer,
921 };
922 
923 
924 /*
925  * free a usb stream instance
926  */
927 static void usX2Y_audio_stream_free(struct snd_usX2Y_substream **usX2Y_substream)
928 {
929         kfree(usX2Y_substream[SNDRV_PCM_STREAM_PLAYBACK]);
930         usX2Y_substream[SNDRV_PCM_STREAM_PLAYBACK] = NULL;
931 
932         kfree(usX2Y_substream[SNDRV_PCM_STREAM_CAPTURE]);
933         usX2Y_substream[SNDRV_PCM_STREAM_CAPTURE] = NULL;
934 }
935 
936 static void snd_usX2Y_pcm_private_free(struct snd_pcm *pcm)
937 {
938         struct snd_usX2Y_substream **usX2Y_stream = pcm->private_data;
939         if (usX2Y_stream)
940                 usX2Y_audio_stream_free(usX2Y_stream);
941 }
942 
943 static int usX2Y_audio_stream_new(struct snd_card *card, int playback_endpoint, int capture_endpoint)
944 {
945         struct snd_pcm *pcm;
946         int err, i;
947         struct snd_usX2Y_substream **usX2Y_substream =
948                 usX2Y(card)->subs + 2 * usX2Y(card)->pcm_devs;
949 
950         for (i = playback_endpoint ? SNDRV_PCM_STREAM_PLAYBACK : SNDRV_PCM_STREAM_CAPTURE;
951              i <= SNDRV_PCM_STREAM_CAPTURE; ++i) {
952                 usX2Y_substream[i] = kzalloc(sizeof(struct snd_usX2Y_substream), GFP_KERNEL);
953                 if (!usX2Y_substream[i])
954                         return -ENOMEM;
955 
956                 usX2Y_substream[i]->usX2Y = usX2Y(card);
957         }
958 
959         if (playback_endpoint)
960                 usX2Y_substream[SNDRV_PCM_STREAM_PLAYBACK]->endpoint = playback_endpoint;
961         usX2Y_substream[SNDRV_PCM_STREAM_CAPTURE]->endpoint = capture_endpoint;
962 
963         err = snd_pcm_new(card, NAME_ALLCAPS" Audio", usX2Y(card)->pcm_devs,
964                           playback_endpoint ? 1 : 0, 1,
965                           &pcm);
966         if (err < 0) {
967                 usX2Y_audio_stream_free(usX2Y_substream);
968                 return err;
969         }
970 
971         if (playback_endpoint)
972                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_usX2Y_pcm_ops);
973         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_usX2Y_pcm_ops);
974 
975         pcm->private_data = usX2Y_substream;
976         pcm->private_free = snd_usX2Y_pcm_private_free;
977         pcm->info_flags = 0;
978 
979         sprintf(pcm->name, NAME_ALLCAPS" Audio #%d", usX2Y(card)->pcm_devs);
980 
981         if ((playback_endpoint &&
982              0 > (err = snd_pcm_lib_preallocate_pages(pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream,
983                                                      SNDRV_DMA_TYPE_CONTINUOUS,
984                                                      snd_dma_continuous_data(GFP_KERNEL),
985                                                      64*1024, 128*1024))) ||
986             0 > (err = snd_pcm_lib_preallocate_pages(pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream,
987                                                      SNDRV_DMA_TYPE_CONTINUOUS,
988                                                      snd_dma_continuous_data(GFP_KERNEL),
989                                                      64*1024, 128*1024))) {
990                 snd_usX2Y_pcm_private_free(pcm);
991                 return err;
992         }
993         usX2Y(card)->pcm_devs++;
994 
995         return 0;
996 }
997 
998 /*
999  * create a chip instance and set its names.
1000  */
1001 int usX2Y_audio_create(struct snd_card *card)
1002 {
1003         int err = 0;
1004         
1005         INIT_LIST_HEAD(&usX2Y(card)->pcm_list);
1006 
1007         if (0 > (err = usX2Y_audio_stream_new(card, 0xA, 0x8)))
1008                 return err;
1009         if (le16_to_cpu(usX2Y(card)->dev->descriptor.idProduct) == USB_ID_US428)
1010              if (0 > (err = usX2Y_audio_stream_new(card, 0, 0xA)))
1011                      return err;
1012         if (le16_to_cpu(usX2Y(card)->dev->descriptor.idProduct) != USB_ID_US122)
1013                 err = usX2Y_rate_set(usX2Y(card), 44100);       // Lets us428 recognize output-volume settings, disturbs us122.
1014         return err;
1015 }
1016 

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