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TOMOYO Linux Cross Reference
Linux/sound/usb/pcm.c

Version: ~ [ linux-5.12-rc1 ] ~ [ linux-5.11.2 ] ~ [ linux-5.10.19 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.101 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.177 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.222 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.258 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.258 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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 #include <linux/init.h>
 18 #include <linux/slab.h>
 19 #include <linux/bitrev.h>
 20 #include <linux/ratelimit.h>
 21 #include <linux/usb.h>
 22 #include <linux/usb/audio.h>
 23 #include <linux/usb/audio-v2.h>
 24 
 25 #include <sound/core.h>
 26 #include <sound/pcm.h>
 27 #include <sound/pcm_params.h>
 28 
 29 #include "usbaudio.h"
 30 #include "card.h"
 31 #include "quirks.h"
 32 #include "debug.h"
 33 #include "endpoint.h"
 34 #include "helper.h"
 35 #include "pcm.h"
 36 #include "clock.h"
 37 #include "power.h"
 38 
 39 #define SUBSTREAM_FLAG_DATA_EP_STARTED  0
 40 #define SUBSTREAM_FLAG_SYNC_EP_STARTED  1
 41 
 42 /* return the estimated delay based on USB frame counters */
 43 snd_pcm_uframes_t snd_usb_pcm_delay(struct snd_usb_substream *subs,
 44                                     unsigned int rate)
 45 {
 46         int current_frame_number;
 47         int frame_diff;
 48         int est_delay;
 49 
 50         if (!subs->last_delay)
 51                 return 0; /* short path */
 52 
 53         current_frame_number = usb_get_current_frame_number(subs->dev);
 54         /*
 55          * HCD implementations use different widths, use lower 8 bits.
 56          * The delay will be managed up to 256ms, which is more than
 57          * enough
 58          */
 59         frame_diff = (current_frame_number - subs->last_frame_number) & 0xff;
 60 
 61         /* Approximation based on number of samples per USB frame (ms),
 62            some truncation for 44.1 but the estimate is good enough */
 63         est_delay =  frame_diff * rate / 1000;
 64         if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
 65                 est_delay = subs->last_delay - est_delay;
 66         else
 67                 est_delay = subs->last_delay + est_delay;
 68 
 69         if (est_delay < 0)
 70                 est_delay = 0;
 71         return est_delay;
 72 }
 73 
 74 /*
 75  * return the current pcm pointer.  just based on the hwptr_done value.
 76  */
 77 static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream)
 78 {
 79         struct snd_usb_substream *subs;
 80         unsigned int hwptr_done;
 81 
 82         subs = (struct snd_usb_substream *)substream->runtime->private_data;
 83         if (atomic_read(&subs->stream->chip->shutdown))
 84                 return SNDRV_PCM_POS_XRUN;
 85         spin_lock(&subs->lock);
 86         hwptr_done = subs->hwptr_done;
 87         substream->runtime->delay = snd_usb_pcm_delay(subs,
 88                                                 substream->runtime->rate);
 89         spin_unlock(&subs->lock);
 90         return hwptr_done / (substream->runtime->frame_bits >> 3);
 91 }
 92 
 93 /*
 94  * find a matching audio format
 95  */
 96 static struct audioformat *find_format(struct snd_usb_substream *subs)
 97 {
 98         struct audioformat *fp;
 99         struct audioformat *found = NULL;
100         int cur_attr = 0, attr;
101 
102         list_for_each_entry(fp, &subs->fmt_list, list) {
103                 if (!(fp->formats & pcm_format_to_bits(subs->pcm_format)))
104                         continue;
105                 if (fp->channels != subs->channels)
106                         continue;
107                 if (subs->cur_rate < fp->rate_min ||
108                     subs->cur_rate > fp->rate_max)
109                         continue;
110                 if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
111                         unsigned int i;
112                         for (i = 0; i < fp->nr_rates; i++)
113                                 if (fp->rate_table[i] == subs->cur_rate)
114                                         break;
115                         if (i >= fp->nr_rates)
116                                 continue;
117                 }
118                 attr = fp->ep_attr & USB_ENDPOINT_SYNCTYPE;
119                 if (! found) {
120                         found = fp;
121                         cur_attr = attr;
122                         continue;
123                 }
124                 /* avoid async out and adaptive in if the other method
125                  * supports the same format.
126                  * this is a workaround for the case like
127                  * M-audio audiophile USB.
128                  */
129                 if (attr != cur_attr) {
130                         if ((attr == USB_ENDPOINT_SYNC_ASYNC &&
131                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
132                             (attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
133                              subs->direction == SNDRV_PCM_STREAM_CAPTURE))
134                                 continue;
135                         if ((cur_attr == USB_ENDPOINT_SYNC_ASYNC &&
136                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
137                             (cur_attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
138                              subs->direction == SNDRV_PCM_STREAM_CAPTURE)) {
139                                 found = fp;
140                                 cur_attr = attr;
141                                 continue;
142                         }
143                 }
144                 /* find the format with the largest max. packet size */
145                 if (fp->maxpacksize > found->maxpacksize) {
146                         found = fp;
147                         cur_attr = attr;
148                 }
149         }
150         return found;
151 }
152 
153 static int init_pitch_v1(struct snd_usb_audio *chip, int iface,
154                          struct usb_host_interface *alts,
155                          struct audioformat *fmt)
156 {
157         struct usb_device *dev = chip->dev;
158         unsigned int ep;
159         unsigned char data[1];
160         int err;
161 
162         if (get_iface_desc(alts)->bNumEndpoints < 1)
163                 return -EINVAL;
164         ep = get_endpoint(alts, 0)->bEndpointAddress;
165 
166         data[0] = 1;
167         if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
168                                    USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
169                                    UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep,
170                                    data, sizeof(data))) < 0) {
171                 usb_audio_err(chip, "%d:%d: cannot set enable PITCH\n",
172                               iface, ep);
173                 return err;
174         }
175 
176         return 0;
177 }
178 
179 static int init_pitch_v2(struct snd_usb_audio *chip, int iface,
180                          struct usb_host_interface *alts,
181                          struct audioformat *fmt)
182 {
183         struct usb_device *dev = chip->dev;
184         unsigned char data[1];
185         int err;
186 
187         data[0] = 1;
188         if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
189                                    USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT,
190                                    UAC2_EP_CS_PITCH << 8, 0,
191                                    data, sizeof(data))) < 0) {
192                 usb_audio_err(chip, "%d:%d: cannot set enable PITCH (v2)\n",
193                               iface, fmt->altsetting);
194                 return err;
195         }
196 
197         return 0;
198 }
199 
200 /*
201  * initialize the pitch control and sample rate
202  */
203 int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface,
204                        struct usb_host_interface *alts,
205                        struct audioformat *fmt)
206 {
207         /* if endpoint doesn't have pitch control, bail out */
208         if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
209                 return 0;
210 
211         switch (fmt->protocol) {
212         case UAC_VERSION_1:
213         default:
214                 return init_pitch_v1(chip, iface, alts, fmt);
215 
216         case UAC_VERSION_2:
217                 return init_pitch_v2(chip, iface, alts, fmt);
218         }
219 }
220 
221 static int start_endpoints(struct snd_usb_substream *subs)
222 {
223         int err;
224 
225         if (!subs->data_endpoint)
226                 return -EINVAL;
227 
228         if (!test_and_set_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) {
229                 struct snd_usb_endpoint *ep = subs->data_endpoint;
230 
231                 dev_dbg(&subs->dev->dev, "Starting data EP @%p\n", ep);
232 
233                 ep->data_subs = subs;
234                 err = snd_usb_endpoint_start(ep);
235                 if (err < 0) {
236                         clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags);
237                         return err;
238                 }
239         }
240 
241         if (subs->sync_endpoint &&
242             !test_and_set_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) {
243                 struct snd_usb_endpoint *ep = subs->sync_endpoint;
244 
245                 if (subs->data_endpoint->iface != subs->sync_endpoint->iface ||
246                     subs->data_endpoint->altsetting != subs->sync_endpoint->altsetting) {
247                         err = usb_set_interface(subs->dev,
248                                                 subs->sync_endpoint->iface,
249                                                 subs->sync_endpoint->altsetting);
250                         if (err < 0) {
251                                 clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
252                                 dev_err(&subs->dev->dev,
253                                            "%d:%d: cannot set interface (%d)\n",
254                                            subs->sync_endpoint->iface,
255                                            subs->sync_endpoint->altsetting, err);
256                                 return -EIO;
257                         }
258                 }
259 
260                 dev_dbg(&subs->dev->dev, "Starting sync EP @%p\n", ep);
261 
262                 ep->sync_slave = subs->data_endpoint;
263                 err = snd_usb_endpoint_start(ep);
264                 if (err < 0) {
265                         clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
266                         return err;
267                 }
268         }
269 
270         return 0;
271 }
272 
273 static void stop_endpoints(struct snd_usb_substream *subs, bool wait)
274 {
275         if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags))
276                 snd_usb_endpoint_stop(subs->sync_endpoint);
277 
278         if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags))
279                 snd_usb_endpoint_stop(subs->data_endpoint);
280 
281         if (wait) {
282                 snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
283                 snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
284         }
285 }
286 
287 static int search_roland_implicit_fb(struct usb_device *dev, int ifnum,
288                                      unsigned int altsetting,
289                                      struct usb_host_interface **alts,
290                                      unsigned int *ep)
291 {
292         struct usb_interface *iface;
293         struct usb_interface_descriptor *altsd;
294         struct usb_endpoint_descriptor *epd;
295 
296         iface = usb_ifnum_to_if(dev, ifnum);
297         if (!iface || iface->num_altsetting < altsetting + 1)
298                 return -ENOENT;
299         *alts = &iface->altsetting[altsetting];
300         altsd = get_iface_desc(*alts);
301         if (altsd->bAlternateSetting != altsetting ||
302             altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC ||
303             (altsd->bInterfaceSubClass != 2 &&
304              altsd->bInterfaceProtocol != 2   ) ||
305             altsd->bNumEndpoints < 1)
306                 return -ENOENT;
307         epd = get_endpoint(*alts, 0);
308         if (!usb_endpoint_is_isoc_in(epd) ||
309             (epd->bmAttributes & USB_ENDPOINT_USAGE_MASK) !=
310                                         USB_ENDPOINT_USAGE_IMPLICIT_FB)
311                 return -ENOENT;
312         *ep = epd->bEndpointAddress;
313         return 0;
314 }
315 
316 static int set_sync_ep_implicit_fb_quirk(struct snd_usb_substream *subs,
317                                          struct usb_device *dev,
318                                          struct usb_interface_descriptor *altsd,
319                                          unsigned int attr)
320 {
321         struct usb_host_interface *alts;
322         struct usb_interface *iface;
323         unsigned int ep;
324 
325         /* Implicit feedback sync EPs consumers are always playback EPs */
326         if (subs->direction != SNDRV_PCM_STREAM_PLAYBACK)
327                 return 0;
328 
329         switch (subs->stream->chip->usb_id) {
330         case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
331         case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C600 */
332                 ep = 0x81;
333                 iface = usb_ifnum_to_if(dev, 3);
334 
335                 if (!iface || iface->num_altsetting == 0)
336                         return -EINVAL;
337 
338                 alts = &iface->altsetting[1];
339                 goto add_sync_ep;
340                 break;
341         case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */
342         case USB_ID(0x0763, 0x2081):
343                 ep = 0x81;
344                 iface = usb_ifnum_to_if(dev, 2);
345 
346                 if (!iface || iface->num_altsetting == 0)
347                         return -EINVAL;
348 
349                 alts = &iface->altsetting[1];
350                 goto add_sync_ep;
351         case USB_ID(0x2466, 0x8003):
352                 ep = 0x86;
353                 iface = usb_ifnum_to_if(dev, 2);
354 
355                 if (!iface || iface->num_altsetting == 0)
356                         return -EINVAL;
357 
358                 alts = &iface->altsetting[1];
359                 goto add_sync_ep;
360 
361         }
362         if (attr == USB_ENDPOINT_SYNC_ASYNC &&
363             altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
364             altsd->bInterfaceProtocol == 2 &&
365             altsd->bNumEndpoints == 1 &&
366             USB_ID_VENDOR(subs->stream->chip->usb_id) == 0x0582 /* Roland */ &&
367             search_roland_implicit_fb(dev, altsd->bInterfaceNumber + 1,
368                                       altsd->bAlternateSetting,
369                                       &alts, &ep) >= 0) {
370                 goto add_sync_ep;
371         }
372 
373         /* No quirk */
374         return 0;
375 
376 add_sync_ep:
377         subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
378                                                    alts, ep, !subs->direction,
379                                                    SND_USB_ENDPOINT_TYPE_DATA);
380         if (!subs->sync_endpoint)
381                 return -EINVAL;
382 
383         subs->data_endpoint->sync_master = subs->sync_endpoint;
384 
385         return 0;
386 }
387 
388 static int set_sync_endpoint(struct snd_usb_substream *subs,
389                              struct audioformat *fmt,
390                              struct usb_device *dev,
391                              struct usb_host_interface *alts,
392                              struct usb_interface_descriptor *altsd)
393 {
394         int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
395         unsigned int ep, attr;
396         bool implicit_fb;
397         int err;
398 
399         /* we need a sync pipe in async OUT or adaptive IN mode */
400         /* check the number of EP, since some devices have broken
401          * descriptors which fool us.  if it has only one EP,
402          * assume it as adaptive-out or sync-in.
403          */
404         attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
405 
406         if ((is_playback && (attr != USB_ENDPOINT_SYNC_ASYNC)) ||
407                 (!is_playback && (attr != USB_ENDPOINT_SYNC_ADAPTIVE))) {
408 
409                 /*
410                  * In these modes the notion of sync_endpoint is irrelevant.
411                  * Reset pointers to avoid using stale data from previously
412                  * used settings, e.g. when configuration and endpoints were
413                  * changed
414                  */
415 
416                 subs->sync_endpoint = NULL;
417                 subs->data_endpoint->sync_master = NULL;
418         }
419 
420         err = set_sync_ep_implicit_fb_quirk(subs, dev, altsd, attr);
421         if (err < 0)
422                 return err;
423 
424         if (altsd->bNumEndpoints < 2)
425                 return 0;
426 
427         if ((is_playback && (attr == USB_ENDPOINT_SYNC_SYNC ||
428                              attr == USB_ENDPOINT_SYNC_ADAPTIVE)) ||
429             (!is_playback && attr != USB_ENDPOINT_SYNC_ADAPTIVE))
430                 return 0;
431 
432         /*
433          * In case of illegal SYNC_NONE for OUT endpoint, we keep going to see
434          * if we don't find a sync endpoint, as on M-Audio Transit. In case of
435          * error fall back to SYNC mode and don't create sync endpoint
436          */
437 
438         /* check sync-pipe endpoint */
439         /* ... and check descriptor size before accessing bSynchAddress
440            because there is a version of the SB Audigy 2 NX firmware lacking
441            the audio fields in the endpoint descriptors */
442         if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC ||
443             (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
444              get_endpoint(alts, 1)->bSynchAddress != 0)) {
445                 dev_err(&dev->dev,
446                         "%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
447                            fmt->iface, fmt->altsetting,
448                            get_endpoint(alts, 1)->bmAttributes,
449                            get_endpoint(alts, 1)->bLength,
450                            get_endpoint(alts, 1)->bSynchAddress);
451                 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
452                         return 0;
453                 return -EINVAL;
454         }
455         ep = get_endpoint(alts, 1)->bEndpointAddress;
456         if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
457             ((is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
458              (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
459                 dev_err(&dev->dev,
460                         "%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
461                            fmt->iface, fmt->altsetting,
462                            is_playback, ep, get_endpoint(alts, 0)->bSynchAddress);
463                 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
464                         return 0;
465                 return -EINVAL;
466         }
467 
468         implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK)
469                         == USB_ENDPOINT_USAGE_IMPLICIT_FB;
470 
471         subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
472                                                    alts, ep, !subs->direction,
473                                                    implicit_fb ?
474                                                         SND_USB_ENDPOINT_TYPE_DATA :
475                                                         SND_USB_ENDPOINT_TYPE_SYNC);
476         if (!subs->sync_endpoint) {
477                 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
478                         return 0;
479                 return -EINVAL;
480         }
481 
482         subs->data_endpoint->sync_master = subs->sync_endpoint;
483 
484         return 0;
485 }
486 
487 /*
488  * find a matching format and set up the interface
489  */
490 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
491 {
492         struct usb_device *dev = subs->dev;
493         struct usb_host_interface *alts;
494         struct usb_interface_descriptor *altsd;
495         struct usb_interface *iface;
496         int err;
497 
498         iface = usb_ifnum_to_if(dev, fmt->iface);
499         if (WARN_ON(!iface))
500                 return -EINVAL;
501         alts = &iface->altsetting[fmt->altset_idx];
502         altsd = get_iface_desc(alts);
503         if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting))
504                 return -EINVAL;
505 
506         if (fmt == subs->cur_audiofmt)
507                 return 0;
508 
509         /* close the old interface */
510         if (subs->interface >= 0 && subs->interface != fmt->iface) {
511                 err = usb_set_interface(subs->dev, subs->interface, 0);
512                 if (err < 0) {
513                         dev_err(&dev->dev,
514                                 "%d:%d: return to setting 0 failed (%d)\n",
515                                 fmt->iface, fmt->altsetting, err);
516                         return -EIO;
517                 }
518                 subs->interface = -1;
519                 subs->altset_idx = 0;
520         }
521 
522         /* set interface */
523         if (subs->interface != fmt->iface ||
524             subs->altset_idx != fmt->altset_idx) {
525 
526                 err = snd_usb_select_mode_quirk(subs, fmt);
527                 if (err < 0)
528                         return -EIO;
529 
530                 err = usb_set_interface(dev, fmt->iface, fmt->altsetting);
531                 if (err < 0) {
532                         dev_err(&dev->dev,
533                                 "%d:%d: usb_set_interface failed (%d)\n",
534                                 fmt->iface, fmt->altsetting, err);
535                         return -EIO;
536                 }
537                 dev_dbg(&dev->dev, "setting usb interface %d:%d\n",
538                         fmt->iface, fmt->altsetting);
539                 subs->interface = fmt->iface;
540                 subs->altset_idx = fmt->altset_idx;
541 
542                 snd_usb_set_interface_quirk(dev);
543         }
544 
545         subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,
546                                                    alts, fmt->endpoint, subs->direction,
547                                                    SND_USB_ENDPOINT_TYPE_DATA);
548 
549         if (!subs->data_endpoint)
550                 return -EINVAL;
551 
552         err = set_sync_endpoint(subs, fmt, dev, alts, altsd);
553         if (err < 0)
554                 return err;
555 
556         err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt);
557         if (err < 0)
558                 return err;
559 
560         subs->cur_audiofmt = fmt;
561 
562         snd_usb_set_format_quirk(subs, fmt);
563 
564         return 0;
565 }
566 
567 /*
568  * Return the score of matching two audioformats.
569  * Veto the audioformat if:
570  * - It has no channels for some reason.
571  * - Requested PCM format is not supported.
572  * - Requested sample rate is not supported.
573  */
574 static int match_endpoint_audioformats(struct snd_usb_substream *subs,
575                                        struct audioformat *fp,
576                                        struct audioformat *match, int rate,
577                                        snd_pcm_format_t pcm_format)
578 {
579         int i;
580         int score = 0;
581 
582         if (fp->channels < 1) {
583                 dev_dbg(&subs->dev->dev,
584                         "%s: (fmt @%p) no channels\n", __func__, fp);
585                 return 0;
586         }
587 
588         if (!(fp->formats & pcm_format_to_bits(pcm_format))) {
589                 dev_dbg(&subs->dev->dev,
590                         "%s: (fmt @%p) no match for format %d\n", __func__,
591                         fp, pcm_format);
592                 return 0;
593         }
594 
595         for (i = 0; i < fp->nr_rates; i++) {
596                 if (fp->rate_table[i] == rate) {
597                         score++;
598                         break;
599                 }
600         }
601         if (!score) {
602                 dev_dbg(&subs->dev->dev,
603                         "%s: (fmt @%p) no match for rate %d\n", __func__,
604                         fp, rate);
605                 return 0;
606         }
607 
608         if (fp->channels == match->channels)
609                 score++;
610 
611         dev_dbg(&subs->dev->dev,
612                 "%s: (fmt @%p) score %d\n", __func__, fp, score);
613 
614         return score;
615 }
616 
617 /*
618  * Configure the sync ep using the rate and pcm format of the data ep.
619  */
620 static int configure_sync_endpoint(struct snd_usb_substream *subs)
621 {
622         int ret;
623         struct audioformat *fp;
624         struct audioformat *sync_fp = NULL;
625         int cur_score = 0;
626         int sync_period_bytes = subs->period_bytes;
627         struct snd_usb_substream *sync_subs =
628                 &subs->stream->substream[subs->direction ^ 1];
629 
630         if (subs->sync_endpoint->type != SND_USB_ENDPOINT_TYPE_DATA ||
631             !subs->stream)
632                 return snd_usb_endpoint_set_params(subs->sync_endpoint,
633                                                    subs->pcm_format,
634                                                    subs->channels,
635                                                    subs->period_bytes,
636                                                    0, 0,
637                                                    subs->cur_rate,
638                                                    subs->cur_audiofmt,
639                                                    NULL);
640 
641         /* Try to find the best matching audioformat. */
642         list_for_each_entry(fp, &sync_subs->fmt_list, list) {
643                 int score = match_endpoint_audioformats(subs,
644                                                         fp, subs->cur_audiofmt,
645                         subs->cur_rate, subs->pcm_format);
646 
647                 if (score > cur_score) {
648                         sync_fp = fp;
649                         cur_score = score;
650                 }
651         }
652 
653         if (unlikely(sync_fp == NULL)) {
654                 dev_err(&subs->dev->dev,
655                         "%s: no valid audioformat for sync ep %x found\n",
656                         __func__, sync_subs->ep_num);
657                 return -EINVAL;
658         }
659 
660         /*
661          * Recalculate the period bytes if channel number differ between
662          * data and sync ep audioformat.
663          */
664         if (sync_fp->channels != subs->channels) {
665                 sync_period_bytes = (subs->period_bytes / subs->channels) *
666                         sync_fp->channels;
667                 dev_dbg(&subs->dev->dev,
668                         "%s: adjusted sync ep period bytes (%d -> %d)\n",
669                         __func__, subs->period_bytes, sync_period_bytes);
670         }
671 
672         ret = snd_usb_endpoint_set_params(subs->sync_endpoint,
673                                           subs->pcm_format,
674                                           sync_fp->channels,
675                                           sync_period_bytes,
676                                           0, 0,
677                                           subs->cur_rate,
678                                           sync_fp,
679                                           NULL);
680 
681         return ret;
682 }
683 
684 /*
685  * configure endpoint params
686  *
687  * called  during initial setup and upon resume
688  */
689 static int configure_endpoint(struct snd_usb_substream *subs)
690 {
691         int ret;
692 
693         /* format changed */
694         stop_endpoints(subs, true);
695         ret = snd_usb_endpoint_set_params(subs->data_endpoint,
696                                           subs->pcm_format,
697                                           subs->channels,
698                                           subs->period_bytes,
699                                           subs->period_frames,
700                                           subs->buffer_periods,
701                                           subs->cur_rate,
702                                           subs->cur_audiofmt,
703                                           subs->sync_endpoint);
704         if (ret < 0)
705                 return ret;
706 
707         if (subs->sync_endpoint)
708                 ret = configure_sync_endpoint(subs);
709 
710         return ret;
711 }
712 
713 /*
714  * hw_params callback
715  *
716  * allocate a buffer and set the given audio format.
717  *
718  * so far we use a physically linear buffer although packetize transfer
719  * doesn't need a continuous area.
720  * if sg buffer is supported on the later version of alsa, we'll follow
721  * that.
722  */
723 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
724                              struct snd_pcm_hw_params *hw_params)
725 {
726         struct snd_usb_substream *subs = substream->runtime->private_data;
727         struct audioformat *fmt;
728         int ret;
729 
730         ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
731                                                params_buffer_bytes(hw_params));
732         if (ret < 0)
733                 return ret;
734 
735         subs->pcm_format = params_format(hw_params);
736         subs->period_bytes = params_period_bytes(hw_params);
737         subs->period_frames = params_period_size(hw_params);
738         subs->buffer_periods = params_periods(hw_params);
739         subs->channels = params_channels(hw_params);
740         subs->cur_rate = params_rate(hw_params);
741 
742         fmt = find_format(subs);
743         if (!fmt) {
744                 dev_dbg(&subs->dev->dev,
745                         "cannot set format: format = %#x, rate = %d, channels = %d\n",
746                            subs->pcm_format, subs->cur_rate, subs->channels);
747                 return -EINVAL;
748         }
749 
750         ret = snd_usb_lock_shutdown(subs->stream->chip);
751         if (ret < 0)
752                 return ret;
753         ret = set_format(subs, fmt);
754         snd_usb_unlock_shutdown(subs->stream->chip);
755         if (ret < 0)
756                 return ret;
757 
758         subs->interface = fmt->iface;
759         subs->altset_idx = fmt->altset_idx;
760         subs->need_setup_ep = true;
761 
762         return 0;
763 }
764 
765 /*
766  * hw_free callback
767  *
768  * reset the audio format and release the buffer
769  */
770 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
771 {
772         struct snd_usb_substream *subs = substream->runtime->private_data;
773 
774         subs->cur_audiofmt = NULL;
775         subs->cur_rate = 0;
776         subs->period_bytes = 0;
777         if (!snd_usb_lock_shutdown(subs->stream->chip)) {
778                 stop_endpoints(subs, true);
779                 snd_usb_endpoint_deactivate(subs->sync_endpoint);
780                 snd_usb_endpoint_deactivate(subs->data_endpoint);
781                 snd_usb_unlock_shutdown(subs->stream->chip);
782         }
783         return snd_pcm_lib_free_vmalloc_buffer(substream);
784 }
785 
786 /*
787  * prepare callback
788  *
789  * only a few subtle things...
790  */
791 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
792 {
793         struct snd_pcm_runtime *runtime = substream->runtime;
794         struct snd_usb_substream *subs = runtime->private_data;
795         struct usb_host_interface *alts;
796         struct usb_interface *iface;
797         int ret;
798 
799         if (! subs->cur_audiofmt) {
800                 dev_err(&subs->dev->dev, "no format is specified!\n");
801                 return -ENXIO;
802         }
803 
804         ret = snd_usb_lock_shutdown(subs->stream->chip);
805         if (ret < 0)
806                 return ret;
807         if (snd_BUG_ON(!subs->data_endpoint)) {
808                 ret = -EIO;
809                 goto unlock;
810         }
811 
812         snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
813         snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
814 
815         ret = set_format(subs, subs->cur_audiofmt);
816         if (ret < 0)
817                 goto unlock;
818 
819         if (subs->need_setup_ep) {
820 
821                 iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface);
822                 alts = &iface->altsetting[subs->cur_audiofmt->altset_idx];
823                 ret = snd_usb_init_sample_rate(subs->stream->chip,
824                                                subs->cur_audiofmt->iface,
825                                                alts,
826                                                subs->cur_audiofmt,
827                                                subs->cur_rate);
828                 if (ret < 0)
829                         goto unlock;
830 
831                 ret = configure_endpoint(subs);
832                 if (ret < 0)
833                         goto unlock;
834                 subs->need_setup_ep = false;
835         }
836 
837         /* some unit conversions in runtime */
838         subs->data_endpoint->maxframesize =
839                 bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
840         subs->data_endpoint->curframesize =
841                 bytes_to_frames(runtime, subs->data_endpoint->curpacksize);
842 
843         /* reset the pointer */
844         subs->hwptr_done = 0;
845         subs->transfer_done = 0;
846         subs->last_delay = 0;
847         subs->last_frame_number = 0;
848         runtime->delay = 0;
849 
850         /* for playback, submit the URBs now; otherwise, the first hwptr_done
851          * updates for all URBs would happen at the same time when starting */
852         if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
853                 ret = start_endpoints(subs);
854 
855  unlock:
856         snd_usb_unlock_shutdown(subs->stream->chip);
857         return ret;
858 }
859 
860 static struct snd_pcm_hardware snd_usb_hardware =
861 {
862         .info =                 SNDRV_PCM_INFO_MMAP |
863                                 SNDRV_PCM_INFO_MMAP_VALID |
864                                 SNDRV_PCM_INFO_BATCH |
865                                 SNDRV_PCM_INFO_INTERLEAVED |
866                                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
867                                 SNDRV_PCM_INFO_PAUSE,
868         .buffer_bytes_max =     1024 * 1024,
869         .period_bytes_min =     64,
870         .period_bytes_max =     512 * 1024,
871         .periods_min =          2,
872         .periods_max =          1024,
873 };
874 
875 static int hw_check_valid_format(struct snd_usb_substream *subs,
876                                  struct snd_pcm_hw_params *params,
877                                  struct audioformat *fp)
878 {
879         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
880         struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
881         struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
882         struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
883         struct snd_mask check_fmts;
884         unsigned int ptime;
885 
886         /* check the format */
887         snd_mask_none(&check_fmts);
888         check_fmts.bits[0] = (u32)fp->formats;
889         check_fmts.bits[1] = (u32)(fp->formats >> 32);
890         snd_mask_intersect(&check_fmts, fmts);
891         if (snd_mask_empty(&check_fmts)) {
892                 hwc_debug("   > check: no supported format %d\n", fp->format);
893                 return 0;
894         }
895         /* check the channels */
896         if (fp->channels < ct->min || fp->channels > ct->max) {
897                 hwc_debug("   > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
898                 return 0;
899         }
900         /* check the rate is within the range */
901         if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
902                 hwc_debug("   > check: rate_min %d > max %d\n", fp->rate_min, it->max);
903                 return 0;
904         }
905         if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
906                 hwc_debug("   > check: rate_max %d < min %d\n", fp->rate_max, it->min);
907                 return 0;
908         }
909         /* check whether the period time is >= the data packet interval */
910         if (subs->speed != USB_SPEED_FULL) {
911                 ptime = 125 * (1 << fp->datainterval);
912                 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
913                         hwc_debug("   > check: ptime %u > max %u\n", ptime, pt->max);
914                         return 0;
915                 }
916         }
917         return 1;
918 }
919 
920 static int hw_rule_rate(struct snd_pcm_hw_params *params,
921                         struct snd_pcm_hw_rule *rule)
922 {
923         struct snd_usb_substream *subs = rule->private;
924         struct audioformat *fp;
925         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
926         unsigned int rmin, rmax;
927         int changed;
928 
929         hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
930         changed = 0;
931         rmin = rmax = 0;
932         list_for_each_entry(fp, &subs->fmt_list, list) {
933                 if (!hw_check_valid_format(subs, params, fp))
934                         continue;
935                 if (changed++) {
936                         if (rmin > fp->rate_min)
937                                 rmin = fp->rate_min;
938                         if (rmax < fp->rate_max)
939                                 rmax = fp->rate_max;
940                 } else {
941                         rmin = fp->rate_min;
942                         rmax = fp->rate_max;
943                 }
944         }
945 
946         if (!changed) {
947                 hwc_debug("  --> get empty\n");
948                 it->empty = 1;
949                 return -EINVAL;
950         }
951 
952         changed = 0;
953         if (it->min < rmin) {
954                 it->min = rmin;
955                 it->openmin = 0;
956                 changed = 1;
957         }
958         if (it->max > rmax) {
959                 it->max = rmax;
960                 it->openmax = 0;
961                 changed = 1;
962         }
963         if (snd_interval_checkempty(it)) {
964                 it->empty = 1;
965                 return -EINVAL;
966         }
967         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
968         return changed;
969 }
970 
971 
972 static int hw_rule_channels(struct snd_pcm_hw_params *params,
973                             struct snd_pcm_hw_rule *rule)
974 {
975         struct snd_usb_substream *subs = rule->private;
976         struct audioformat *fp;
977         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
978         unsigned int rmin, rmax;
979         int changed;
980 
981         hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
982         changed = 0;
983         rmin = rmax = 0;
984         list_for_each_entry(fp, &subs->fmt_list, list) {
985                 if (!hw_check_valid_format(subs, params, fp))
986                         continue;
987                 if (changed++) {
988                         if (rmin > fp->channels)
989                                 rmin = fp->channels;
990                         if (rmax < fp->channels)
991                                 rmax = fp->channels;
992                 } else {
993                         rmin = fp->channels;
994                         rmax = fp->channels;
995                 }
996         }
997 
998         if (!changed) {
999                 hwc_debug("  --> get empty\n");
1000                 it->empty = 1;
1001                 return -EINVAL;
1002         }
1003 
1004         changed = 0;
1005         if (it->min < rmin) {
1006                 it->min = rmin;
1007                 it->openmin = 0;
1008                 changed = 1;
1009         }
1010         if (it->max > rmax) {
1011                 it->max = rmax;
1012                 it->openmax = 0;
1013                 changed = 1;
1014         }
1015         if (snd_interval_checkempty(it)) {
1016                 it->empty = 1;
1017                 return -EINVAL;
1018         }
1019         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1020         return changed;
1021 }
1022 
1023 static int hw_rule_format(struct snd_pcm_hw_params *params,
1024                           struct snd_pcm_hw_rule *rule)
1025 {
1026         struct snd_usb_substream *subs = rule->private;
1027         struct audioformat *fp;
1028         struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1029         u64 fbits;
1030         u32 oldbits[2];
1031         int changed;
1032 
1033         hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
1034         fbits = 0;
1035         list_for_each_entry(fp, &subs->fmt_list, list) {
1036                 if (!hw_check_valid_format(subs, params, fp))
1037                         continue;
1038                 fbits |= fp->formats;
1039         }
1040 
1041         oldbits[0] = fmt->bits[0];
1042         oldbits[1] = fmt->bits[1];
1043         fmt->bits[0] &= (u32)fbits;
1044         fmt->bits[1] &= (u32)(fbits >> 32);
1045         if (!fmt->bits[0] && !fmt->bits[1]) {
1046                 hwc_debug("  --> get empty\n");
1047                 return -EINVAL;
1048         }
1049         changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
1050         hwc_debug("  --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
1051         return changed;
1052 }
1053 
1054 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
1055                                struct snd_pcm_hw_rule *rule)
1056 {
1057         struct snd_usb_substream *subs = rule->private;
1058         struct audioformat *fp;
1059         struct snd_interval *it;
1060         unsigned char min_datainterval;
1061         unsigned int pmin;
1062         int changed;
1063 
1064         it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
1065         hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
1066         min_datainterval = 0xff;
1067         list_for_each_entry(fp, &subs->fmt_list, list) {
1068                 if (!hw_check_valid_format(subs, params, fp))
1069                         continue;
1070                 min_datainterval = min(min_datainterval, fp->datainterval);
1071         }
1072         if (min_datainterval == 0xff) {
1073                 hwc_debug("  --> get empty\n");
1074                 it->empty = 1;
1075                 return -EINVAL;
1076         }
1077         pmin = 125 * (1 << min_datainterval);
1078         changed = 0;
1079         if (it->min < pmin) {
1080                 it->min = pmin;
1081                 it->openmin = 0;
1082                 changed = 1;
1083         }
1084         if (snd_interval_checkempty(it)) {
1085                 it->empty = 1;
1086                 return -EINVAL;
1087         }
1088         hwc_debug("  --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
1089         return changed;
1090 }
1091 
1092 /*
1093  *  If the device supports unusual bit rates, does the request meet these?
1094  */
1095 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
1096                                   struct snd_usb_substream *subs)
1097 {
1098         struct audioformat *fp;
1099         int *rate_list;
1100         int count = 0, needs_knot = 0;
1101         int err;
1102 
1103         kfree(subs->rate_list.list);
1104         subs->rate_list.list = NULL;
1105 
1106         list_for_each_entry(fp, &subs->fmt_list, list) {
1107                 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
1108                         return 0;
1109                 count += fp->nr_rates;
1110                 if (fp->rates & SNDRV_PCM_RATE_KNOT)
1111                         needs_knot = 1;
1112         }
1113         if (!needs_knot)
1114                 return 0;
1115 
1116         subs->rate_list.list = rate_list =
1117                 kmalloc(sizeof(int) * count, GFP_KERNEL);
1118         if (!subs->rate_list.list)
1119                 return -ENOMEM;
1120         subs->rate_list.count = count;
1121         subs->rate_list.mask = 0;
1122         count = 0;
1123         list_for_each_entry(fp, &subs->fmt_list, list) {
1124                 int i;
1125                 for (i = 0; i < fp->nr_rates; i++)
1126                         rate_list[count++] = fp->rate_table[i];
1127         }
1128         err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1129                                          &subs->rate_list);
1130         if (err < 0)
1131                 return err;
1132 
1133         return 0;
1134 }
1135 
1136 
1137 /*
1138  * set up the runtime hardware information.
1139  */
1140 
1141 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
1142 {
1143         struct audioformat *fp;
1144         unsigned int pt, ptmin;
1145         int param_period_time_if_needed;
1146         int err;
1147 
1148         runtime->hw.formats = subs->formats;
1149 
1150         runtime->hw.rate_min = 0x7fffffff;
1151         runtime->hw.rate_max = 0;
1152         runtime->hw.channels_min = 256;
1153         runtime->hw.channels_max = 0;
1154         runtime->hw.rates = 0;
1155         ptmin = UINT_MAX;
1156         /* check min/max rates and channels */
1157         list_for_each_entry(fp, &subs->fmt_list, list) {
1158                 runtime->hw.rates |= fp->rates;
1159                 if (runtime->hw.rate_min > fp->rate_min)
1160                         runtime->hw.rate_min = fp->rate_min;
1161                 if (runtime->hw.rate_max < fp->rate_max)
1162                         runtime->hw.rate_max = fp->rate_max;
1163                 if (runtime->hw.channels_min > fp->channels)
1164                         runtime->hw.channels_min = fp->channels;
1165                 if (runtime->hw.channels_max < fp->channels)
1166                         runtime->hw.channels_max = fp->channels;
1167                 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
1168                         /* FIXME: there might be more than one audio formats... */
1169                         runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
1170                                 fp->frame_size;
1171                 }
1172                 pt = 125 * (1 << fp->datainterval);
1173                 ptmin = min(ptmin, pt);
1174         }
1175         err = snd_usb_autoresume(subs->stream->chip);
1176         if (err < 0)
1177                 return err;
1178 
1179         param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
1180         if (subs->speed == USB_SPEED_FULL)
1181                 /* full speed devices have fixed data packet interval */
1182                 ptmin = 1000;
1183         if (ptmin == 1000)
1184                 /* if period time doesn't go below 1 ms, no rules needed */
1185                 param_period_time_if_needed = -1;
1186         snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1187                                      ptmin, UINT_MAX);
1188 
1189         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1190                                        hw_rule_rate, subs,
1191                                        SNDRV_PCM_HW_PARAM_FORMAT,
1192                                        SNDRV_PCM_HW_PARAM_CHANNELS,
1193                                        param_period_time_if_needed,
1194                                        -1)) < 0)
1195                 goto rep_err;
1196         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1197                                        hw_rule_channels, subs,
1198                                        SNDRV_PCM_HW_PARAM_FORMAT,
1199                                        SNDRV_PCM_HW_PARAM_RATE,
1200                                        param_period_time_if_needed,
1201                                        -1)) < 0)
1202                 goto rep_err;
1203         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1204                                        hw_rule_format, subs,
1205                                        SNDRV_PCM_HW_PARAM_RATE,
1206                                        SNDRV_PCM_HW_PARAM_CHANNELS,
1207                                        param_period_time_if_needed,
1208                                        -1)) < 0)
1209                 goto rep_err;
1210         if (param_period_time_if_needed >= 0) {
1211                 err = snd_pcm_hw_rule_add(runtime, 0,
1212                                           SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1213                                           hw_rule_period_time, subs,
1214                                           SNDRV_PCM_HW_PARAM_FORMAT,
1215                                           SNDRV_PCM_HW_PARAM_CHANNELS,
1216                                           SNDRV_PCM_HW_PARAM_RATE,
1217                                           -1);
1218                 if (err < 0)
1219                         goto rep_err;
1220         }
1221         if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0)
1222                 goto rep_err;
1223         return 0;
1224 
1225 rep_err:
1226         snd_usb_autosuspend(subs->stream->chip);
1227         return err;
1228 }
1229 
1230 static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction)
1231 {
1232         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1233         struct snd_pcm_runtime *runtime = substream->runtime;
1234         struct snd_usb_substream *subs = &as->substream[direction];
1235 
1236         subs->interface = -1;
1237         subs->altset_idx = 0;
1238         runtime->hw = snd_usb_hardware;
1239         runtime->private_data = subs;
1240         subs->pcm_substream = substream;
1241         /* runtime PM is also done there */
1242 
1243         /* initialize DSD/DOP context */
1244         subs->dsd_dop.byte_idx = 0;
1245         subs->dsd_dop.channel = 0;
1246         subs->dsd_dop.marker = 1;
1247 
1248         return setup_hw_info(runtime, subs);
1249 }
1250 
1251 static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction)
1252 {
1253         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1254         struct snd_usb_substream *subs = &as->substream[direction];
1255 
1256         stop_endpoints(subs, true);
1257 
1258         if (subs->interface >= 0 &&
1259             !snd_usb_lock_shutdown(subs->stream->chip)) {
1260                 usb_set_interface(subs->dev, subs->interface, 0);
1261                 subs->interface = -1;
1262                 snd_usb_unlock_shutdown(subs->stream->chip);
1263         }
1264 
1265         subs->pcm_substream = NULL;
1266         snd_usb_autosuspend(subs->stream->chip);
1267 
1268         return 0;
1269 }
1270 
1271 /* Since a URB can handle only a single linear buffer, we must use double
1272  * buffering when the data to be transferred overflows the buffer boundary.
1273  * To avoid inconsistencies when updating hwptr_done, we use double buffering
1274  * for all URBs.
1275  */
1276 static void retire_capture_urb(struct snd_usb_substream *subs,
1277                                struct urb *urb)
1278 {
1279         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1280         unsigned int stride, frames, bytes, oldptr;
1281         int i, period_elapsed = 0;
1282         unsigned long flags;
1283         unsigned char *cp;
1284         int current_frame_number;
1285 
1286         /* read frame number here, update pointer in critical section */
1287         current_frame_number = usb_get_current_frame_number(subs->dev);
1288 
1289         stride = runtime->frame_bits >> 3;
1290 
1291         for (i = 0; i < urb->number_of_packets; i++) {
1292                 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj;
1293                 if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
1294                         dev_dbg(&subs->dev->dev, "frame %d active: %d\n",
1295                                 i, urb->iso_frame_desc[i].status);
1296                         // continue;
1297                 }
1298                 bytes = urb->iso_frame_desc[i].actual_length;
1299                 frames = bytes / stride;
1300                 if (!subs->txfr_quirk)
1301                         bytes = frames * stride;
1302                 if (bytes % (runtime->sample_bits >> 3) != 0) {
1303                         int oldbytes = bytes;
1304                         bytes = frames * stride;
1305                         dev_warn(&subs->dev->dev,
1306                                  "Corrected urb data len. %d->%d\n",
1307                                                         oldbytes, bytes);
1308                 }
1309                 /* update the current pointer */
1310                 spin_lock_irqsave(&subs->lock, flags);
1311                 oldptr = subs->hwptr_done;
1312                 subs->hwptr_done += bytes;
1313                 if (subs->hwptr_done >= runtime->buffer_size * stride)
1314                         subs->hwptr_done -= runtime->buffer_size * stride;
1315                 frames = (bytes + (oldptr % stride)) / stride;
1316                 subs->transfer_done += frames;
1317                 if (subs->transfer_done >= runtime->period_size) {
1318                         subs->transfer_done -= runtime->period_size;
1319                         period_elapsed = 1;
1320                 }
1321                 /* capture delay is by construction limited to one URB,
1322                  * reset delays here
1323                  */
1324                 runtime->delay = subs->last_delay = 0;
1325 
1326                 /* realign last_frame_number */
1327                 subs->last_frame_number = current_frame_number;
1328                 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1329 
1330                 spin_unlock_irqrestore(&subs->lock, flags);
1331                 /* copy a data chunk */
1332                 if (oldptr + bytes > runtime->buffer_size * stride) {
1333                         unsigned int bytes1 =
1334                                         runtime->buffer_size * stride - oldptr;
1335                         memcpy(runtime->dma_area + oldptr, cp, bytes1);
1336                         memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
1337                 } else {
1338                         memcpy(runtime->dma_area + oldptr, cp, bytes);
1339                 }
1340         }
1341 
1342         if (period_elapsed)
1343                 snd_pcm_period_elapsed(subs->pcm_substream);
1344 }
1345 
1346 static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs,
1347                                              struct urb *urb, unsigned int bytes)
1348 {
1349         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1350         unsigned int stride = runtime->frame_bits >> 3;
1351         unsigned int dst_idx = 0;
1352         unsigned int src_idx = subs->hwptr_done;
1353         unsigned int wrap = runtime->buffer_size * stride;
1354         u8 *dst = urb->transfer_buffer;
1355         u8 *src = runtime->dma_area;
1356         u8 marker[] = { 0x05, 0xfa };
1357 
1358         /*
1359          * The DSP DOP format defines a way to transport DSD samples over
1360          * normal PCM data endpoints. It requires stuffing of marker bytes
1361          * (0x05 and 0xfa, alternating per sample frame), and then expects
1362          * 2 additional bytes of actual payload. The whole frame is stored
1363          * LSB.
1364          *
1365          * Hence, for a stereo transport, the buffer layout looks like this,
1366          * where L refers to left channel samples and R to right.
1367          *
1368          *   L1 L2 0x05   R1 R2 0x05   L3 L4 0xfa  R3 R4 0xfa
1369          *   L5 L6 0x05   R5 R6 0x05   L7 L8 0xfa  R7 R8 0xfa
1370          *   .....
1371          *
1372          */
1373 
1374         while (bytes--) {
1375                 if (++subs->dsd_dop.byte_idx == 3) {
1376                         /* frame boundary? */
1377                         dst[dst_idx++] = marker[subs->dsd_dop.marker];
1378                         src_idx += 2;
1379                         subs->dsd_dop.byte_idx = 0;
1380 
1381                         if (++subs->dsd_dop.channel % runtime->channels == 0) {
1382                                 /* alternate the marker */
1383                                 subs->dsd_dop.marker++;
1384                                 subs->dsd_dop.marker %= ARRAY_SIZE(marker);
1385                                 subs->dsd_dop.channel = 0;
1386                         }
1387                 } else {
1388                         /* stuff the DSD payload */
1389                         int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap;
1390 
1391                         if (subs->cur_audiofmt->dsd_bitrev)
1392                                 dst[dst_idx++] = bitrev8(src[idx]);
1393                         else
1394                                 dst[dst_idx++] = src[idx];
1395 
1396                         subs->hwptr_done++;
1397                 }
1398         }
1399         if (subs->hwptr_done >= runtime->buffer_size * stride)
1400                 subs->hwptr_done -= runtime->buffer_size * stride;
1401 }
1402 
1403 static void copy_to_urb(struct snd_usb_substream *subs, struct urb *urb,
1404                         int offset, int stride, unsigned int bytes)
1405 {
1406         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1407 
1408         if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
1409                 /* err, the transferred area goes over buffer boundary. */
1410                 unsigned int bytes1 =
1411                         runtime->buffer_size * stride - subs->hwptr_done;
1412                 memcpy(urb->transfer_buffer + offset,
1413                        runtime->dma_area + subs->hwptr_done, bytes1);
1414                 memcpy(urb->transfer_buffer + offset + bytes1,
1415                        runtime->dma_area, bytes - bytes1);
1416         } else {
1417                 memcpy(urb->transfer_buffer + offset,
1418                        runtime->dma_area + subs->hwptr_done, bytes);
1419         }
1420         subs->hwptr_done += bytes;
1421         if (subs->hwptr_done >= runtime->buffer_size * stride)
1422                 subs->hwptr_done -= runtime->buffer_size * stride;
1423 }
1424 
1425 static unsigned int copy_to_urb_quirk(struct snd_usb_substream *subs,
1426                                       struct urb *urb, int stride,
1427                                       unsigned int bytes)
1428 {
1429         __le32 packet_length;
1430         int i;
1431 
1432         /* Put __le32 length descriptor at start of each packet. */
1433         for (i = 0; i < urb->number_of_packets; i++) {
1434                 unsigned int length = urb->iso_frame_desc[i].length;
1435                 unsigned int offset = urb->iso_frame_desc[i].offset;
1436 
1437                 packet_length = cpu_to_le32(length);
1438                 offset += i * sizeof(packet_length);
1439                 urb->iso_frame_desc[i].offset = offset;
1440                 urb->iso_frame_desc[i].length += sizeof(packet_length);
1441                 memcpy(urb->transfer_buffer + offset,
1442                        &packet_length, sizeof(packet_length));
1443                 copy_to_urb(subs, urb, offset + sizeof(packet_length),
1444                             stride, length);
1445         }
1446         /* Adjust transfer size accordingly. */
1447         bytes += urb->number_of_packets * sizeof(packet_length);
1448         return bytes;
1449 }
1450 
1451 static void prepare_playback_urb(struct snd_usb_substream *subs,
1452                                  struct urb *urb)
1453 {
1454         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1455         struct snd_usb_endpoint *ep = subs->data_endpoint;
1456         struct snd_urb_ctx *ctx = urb->context;
1457         unsigned int counts, frames, bytes;
1458         int i, stride, period_elapsed = 0;
1459         unsigned long flags;
1460 
1461         stride = runtime->frame_bits >> 3;
1462 
1463         frames = 0;
1464         urb->number_of_packets = 0;
1465         spin_lock_irqsave(&subs->lock, flags);
1466         subs->frame_limit += ep->max_urb_frames;
1467         for (i = 0; i < ctx->packets; i++) {
1468                 if (ctx->packet_size[i])
1469                         counts = ctx->packet_size[i];
1470                 else
1471                         counts = snd_usb_endpoint_next_packet_size(ep);
1472 
1473                 /* set up descriptor */
1474                 urb->iso_frame_desc[i].offset = frames * ep->stride;
1475                 urb->iso_frame_desc[i].length = counts * ep->stride;
1476                 frames += counts;
1477                 urb->number_of_packets++;
1478                 subs->transfer_done += counts;
1479                 if (subs->transfer_done >= runtime->period_size) {
1480                         subs->transfer_done -= runtime->period_size;
1481                         subs->frame_limit = 0;
1482                         period_elapsed = 1;
1483                         if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
1484                                 if (subs->transfer_done > 0) {
1485                                         /* FIXME: fill-max mode is not
1486                                          * supported yet */
1487                                         frames -= subs->transfer_done;
1488                                         counts -= subs->transfer_done;
1489                                         urb->iso_frame_desc[i].length =
1490                                                 counts * ep->stride;
1491                                         subs->transfer_done = 0;
1492                                 }
1493                                 i++;
1494                                 if (i < ctx->packets) {
1495                                         /* add a transfer delimiter */
1496                                         urb->iso_frame_desc[i].offset =
1497                                                 frames * ep->stride;
1498                                         urb->iso_frame_desc[i].length = 0;
1499                                         urb->number_of_packets++;
1500                                 }
1501                                 break;
1502                         }
1503                 }
1504                 /* finish at the period boundary or after enough frames */
1505                 if ((period_elapsed ||
1506                                 subs->transfer_done >= subs->frame_limit) &&
1507                     !snd_usb_endpoint_implicit_feedback_sink(ep))
1508                         break;
1509         }
1510         bytes = frames * ep->stride;
1511 
1512         if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE &&
1513                      subs->cur_audiofmt->dsd_dop)) {
1514                 fill_playback_urb_dsd_dop(subs, urb, bytes);
1515         } else if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U8 &&
1516                            subs->cur_audiofmt->dsd_bitrev)) {
1517                 /* bit-reverse the bytes */
1518                 u8 *buf = urb->transfer_buffer;
1519                 for (i = 0; i < bytes; i++) {
1520                         int idx = (subs->hwptr_done + i)
1521                                 % (runtime->buffer_size * stride);
1522                         buf[i] = bitrev8(runtime->dma_area[idx]);
1523                 }
1524 
1525                 subs->hwptr_done += bytes;
1526                 if (subs->hwptr_done >= runtime->buffer_size * stride)
1527                         subs->hwptr_done -= runtime->buffer_size * stride;
1528         } else {
1529                 /* usual PCM */
1530                 if (!subs->tx_length_quirk)
1531                         copy_to_urb(subs, urb, 0, stride, bytes);
1532                 else
1533                         bytes = copy_to_urb_quirk(subs, urb, stride, bytes);
1534                         /* bytes is now amount of outgoing data */
1535         }
1536 
1537         /* update delay with exact number of samples queued */
1538         runtime->delay = subs->last_delay;
1539         runtime->delay += frames;
1540         subs->last_delay = runtime->delay;
1541 
1542         /* realign last_frame_number */
1543         subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1544         subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1545 
1546         if (subs->trigger_tstamp_pending_update) {
1547                 /* this is the first actual URB submitted,
1548                  * update trigger timestamp to reflect actual start time
1549                  */
1550                 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1551                 subs->trigger_tstamp_pending_update = false;
1552         }
1553 
1554         spin_unlock_irqrestore(&subs->lock, flags);
1555         urb->transfer_buffer_length = bytes;
1556         if (period_elapsed)
1557                 snd_pcm_period_elapsed(subs->pcm_substream);
1558 }
1559 
1560 /*
1561  * process after playback data complete
1562  * - decrease the delay count again
1563  */
1564 static void retire_playback_urb(struct snd_usb_substream *subs,
1565                                struct urb *urb)
1566 {
1567         unsigned long flags;
1568         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1569         struct snd_usb_endpoint *ep = subs->data_endpoint;
1570         int processed = urb->transfer_buffer_length / ep->stride;
1571         int est_delay;
1572 
1573         /* ignore the delay accounting when procssed=0 is given, i.e.
1574          * silent payloads are procssed before handling the actual data
1575          */
1576         if (!processed)
1577                 return;
1578 
1579         spin_lock_irqsave(&subs->lock, flags);
1580         if (!subs->last_delay)
1581                 goto out; /* short path */
1582 
1583         est_delay = snd_usb_pcm_delay(subs, runtime->rate);
1584         /* update delay with exact number of samples played */
1585         if (processed > subs->last_delay)
1586                 subs->last_delay = 0;
1587         else
1588                 subs->last_delay -= processed;
1589         runtime->delay = subs->last_delay;
1590 
1591         /*
1592          * Report when delay estimate is off by more than 2ms.
1593          * The error should be lower than 2ms since the estimate relies
1594          * on two reads of a counter updated every ms.
1595          */
1596         if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
1597                 dev_dbg_ratelimited(&subs->dev->dev,
1598                         "delay: estimated %d, actual %d\n",
1599                         est_delay, subs->last_delay);
1600 
1601         if (!subs->running) {
1602                 /* update last_frame_number for delay counting here since
1603                  * prepare_playback_urb won't be called during pause
1604                  */
1605                 subs->last_frame_number =
1606                         usb_get_current_frame_number(subs->dev) & 0xff;
1607         }
1608 
1609  out:
1610         spin_unlock_irqrestore(&subs->lock, flags);
1611 }
1612 
1613 static int snd_usb_playback_open(struct snd_pcm_substream *substream)
1614 {
1615         return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_PLAYBACK);
1616 }
1617 
1618 static int snd_usb_playback_close(struct snd_pcm_substream *substream)
1619 {
1620         return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK);
1621 }
1622 
1623 static int snd_usb_capture_open(struct snd_pcm_substream *substream)
1624 {
1625         return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_CAPTURE);
1626 }
1627 
1628 static int snd_usb_capture_close(struct snd_pcm_substream *substream)
1629 {
1630         return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE);
1631 }
1632 
1633 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
1634                                               int cmd)
1635 {
1636         struct snd_usb_substream *subs = substream->runtime->private_data;
1637 
1638         switch (cmd) {
1639         case SNDRV_PCM_TRIGGER_START:
1640                 subs->trigger_tstamp_pending_update = true;
1641         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1642                 subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
1643                 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1644                 subs->running = 1;
1645                 return 0;
1646         case SNDRV_PCM_TRIGGER_STOP:
1647                 stop_endpoints(subs, false);
1648                 subs->running = 0;
1649                 return 0;
1650         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1651                 subs->data_endpoint->prepare_data_urb = NULL;
1652                 /* keep retire_data_urb for delay calculation */
1653                 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1654                 subs->running = 0;
1655                 return 0;
1656         }
1657 
1658         return -EINVAL;
1659 }
1660 
1661 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
1662                                              int cmd)
1663 {
1664         int err;
1665         struct snd_usb_substream *subs = substream->runtime->private_data;
1666 
1667         switch (cmd) {
1668         case SNDRV_PCM_TRIGGER_START:
1669                 err = start_endpoints(subs);
1670                 if (err < 0)
1671                         return err;
1672 
1673                 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1674                 subs->running = 1;
1675                 return 0;
1676         case SNDRV_PCM_TRIGGER_STOP:
1677                 stop_endpoints(subs, false);
1678                 subs->running = 0;
1679                 return 0;
1680         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1681                 subs->data_endpoint->retire_data_urb = NULL;
1682                 subs->running = 0;
1683                 return 0;
1684         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1685                 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1686                 subs->running = 1;
1687                 return 0;
1688         }
1689 
1690         return -EINVAL;
1691 }
1692 
1693 static struct snd_pcm_ops snd_usb_playback_ops = {
1694         .open =         snd_usb_playback_open,
1695         .close =        snd_usb_playback_close,
1696         .ioctl =        snd_pcm_lib_ioctl,
1697         .hw_params =    snd_usb_hw_params,
1698         .hw_free =      snd_usb_hw_free,
1699         .prepare =      snd_usb_pcm_prepare,
1700         .trigger =      snd_usb_substream_playback_trigger,
1701         .pointer =      snd_usb_pcm_pointer,
1702         .page =         snd_pcm_lib_get_vmalloc_page,
1703         .mmap =         snd_pcm_lib_mmap_vmalloc,
1704 };
1705 
1706 static struct snd_pcm_ops snd_usb_capture_ops = {
1707         .open =         snd_usb_capture_open,
1708         .close =        snd_usb_capture_close,
1709         .ioctl =        snd_pcm_lib_ioctl,
1710         .hw_params =    snd_usb_hw_params,
1711         .hw_free =      snd_usb_hw_free,
1712         .prepare =      snd_usb_pcm_prepare,
1713         .trigger =      snd_usb_substream_capture_trigger,
1714         .pointer =      snd_usb_pcm_pointer,
1715         .page =         snd_pcm_lib_get_vmalloc_page,
1716         .mmap =         snd_pcm_lib_mmap_vmalloc,
1717 };
1718 
1719 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
1720 {
1721         snd_pcm_set_ops(pcm, stream,
1722                         stream == SNDRV_PCM_STREAM_PLAYBACK ?
1723                         &snd_usb_playback_ops : &snd_usb_capture_ops);
1724 }
1725 

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