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

Version: ~ [ linux-5.5-rc1 ] ~ [ linux-5.4.2 ] ~ [ linux-5.3.15 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.88 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.158 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.206 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.206 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.78 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ 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 
 18 #include <linux/init.h>
 19 #include <linux/slab.h>
 20 #include <linux/usb.h>
 21 #include <linux/usb/audio.h>
 22 #include <linux/usb/audio-v2.h>
 23 
 24 #include <sound/core.h>
 25 #include <sound/pcm.h>
 26 #include <sound/control.h>
 27 #include <sound/tlv.h>
 28 
 29 #include "usbaudio.h"
 30 #include "card.h"
 31 #include "proc.h"
 32 #include "quirks.h"
 33 #include "endpoint.h"
 34 #include "pcm.h"
 35 #include "helper.h"
 36 #include "format.h"
 37 #include "clock.h"
 38 #include "stream.h"
 39 
 40 /*
 41  * free a substream
 42  */
 43 static void free_substream(struct snd_usb_substream *subs)
 44 {
 45         struct audioformat *fp, *n;
 46 
 47         if (!subs->num_formats)
 48                 return; /* not initialized */
 49         list_for_each_entry_safe(fp, n, &subs->fmt_list, list) {
 50                 kfree(fp->rate_table);
 51                 kfree(fp->chmap);
 52                 kfree(fp);
 53         }
 54         kfree(subs->rate_list.list);
 55 }
 56 
 57 
 58 /*
 59  * free a usb stream instance
 60  */
 61 static void snd_usb_audio_stream_free(struct snd_usb_stream *stream)
 62 {
 63         free_substream(&stream->substream[0]);
 64         free_substream(&stream->substream[1]);
 65         list_del(&stream->list);
 66         kfree(stream);
 67 }
 68 
 69 static void snd_usb_audio_pcm_free(struct snd_pcm *pcm)
 70 {
 71         struct snd_usb_stream *stream = pcm->private_data;
 72         if (stream) {
 73                 stream->pcm = NULL;
 74                 snd_usb_audio_stream_free(stream);
 75         }
 76 }
 77 
 78 /*
 79  * initialize the substream instance.
 80  */
 81 
 82 static void snd_usb_init_substream(struct snd_usb_stream *as,
 83                                    int stream,
 84                                    struct audioformat *fp)
 85 {
 86         struct snd_usb_substream *subs = &as->substream[stream];
 87 
 88         INIT_LIST_HEAD(&subs->fmt_list);
 89         spin_lock_init(&subs->lock);
 90 
 91         subs->stream = as;
 92         subs->direction = stream;
 93         subs->dev = as->chip->dev;
 94         subs->txfr_quirk = as->chip->txfr_quirk;
 95         subs->speed = snd_usb_get_speed(subs->dev);
 96         subs->pkt_offset_adj = 0;
 97 
 98         snd_usb_set_pcm_ops(as->pcm, stream);
 99 
100         list_add_tail(&fp->list, &subs->fmt_list);
101         subs->formats |= fp->formats;
102         subs->num_formats++;
103         subs->fmt_type = fp->fmt_type;
104         subs->ep_num = fp->endpoint;
105         if (fp->channels > subs->channels_max)
106                 subs->channels_max = fp->channels;
107 }
108 
109 /* kctl callbacks for usb-audio channel maps */
110 static int usb_chmap_ctl_info(struct snd_kcontrol *kcontrol,
111                               struct snd_ctl_elem_info *uinfo)
112 {
113         struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
114         struct snd_usb_substream *subs = info->private_data;
115 
116         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
117         uinfo->count = subs->channels_max;
118         uinfo->value.integer.min = 0;
119         uinfo->value.integer.max = SNDRV_CHMAP_LAST;
120         return 0;
121 }
122 
123 /* check whether a duplicated entry exists in the audiofmt list */
124 static bool have_dup_chmap(struct snd_usb_substream *subs,
125                            struct audioformat *fp)
126 {
127         struct list_head *p;
128 
129         for (p = fp->list.prev; p != &subs->fmt_list; p = p->prev) {
130                 struct audioformat *prev;
131                 prev = list_entry(p, struct audioformat, list);
132                 if (prev->chmap &&
133                     !memcmp(prev->chmap, fp->chmap, sizeof(*fp->chmap)))
134                         return true;
135         }
136         return false;
137 }
138 
139 static int usb_chmap_ctl_tlv(struct snd_kcontrol *kcontrol, int op_flag,
140                              unsigned int size, unsigned int __user *tlv)
141 {
142         struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
143         struct snd_usb_substream *subs = info->private_data;
144         struct audioformat *fp;
145         unsigned int __user *dst;
146         int count = 0;
147 
148         if (size < 8)
149                 return -ENOMEM;
150         if (put_user(SNDRV_CTL_TLVT_CONTAINER, tlv))
151                 return -EFAULT;
152         size -= 8;
153         dst = tlv + 2;
154         list_for_each_entry(fp, &subs->fmt_list, list) {
155                 int i, ch_bytes;
156 
157                 if (!fp->chmap)
158                         continue;
159                 if (have_dup_chmap(subs, fp))
160                         continue;
161                 /* copy the entry */
162                 ch_bytes = fp->chmap->channels * 4;
163                 if (size < 8 + ch_bytes)
164                         return -ENOMEM;
165                 if (put_user(SNDRV_CTL_TLVT_CHMAP_FIXED, dst) ||
166                     put_user(ch_bytes, dst + 1))
167                         return -EFAULT;
168                 dst += 2;
169                 for (i = 0; i < fp->chmap->channels; i++, dst++) {
170                         if (put_user(fp->chmap->map[i], dst))
171                                 return -EFAULT;
172                 }
173 
174                 count += 8 + ch_bytes;
175                 size -= 8 + ch_bytes;
176         }
177         if (put_user(count, tlv + 1))
178                 return -EFAULT;
179         return 0;
180 }
181 
182 static int usb_chmap_ctl_get(struct snd_kcontrol *kcontrol,
183                              struct snd_ctl_elem_value *ucontrol)
184 {
185         struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
186         struct snd_usb_substream *subs = info->private_data;
187         struct snd_pcm_chmap_elem *chmap = NULL;
188         int i;
189 
190         memset(ucontrol->value.integer.value, 0,
191                sizeof(ucontrol->value.integer.value));
192         if (subs->cur_audiofmt)
193                 chmap = subs->cur_audiofmt->chmap;
194         if (chmap) {
195                 for (i = 0; i < chmap->channels; i++)
196                         ucontrol->value.integer.value[i] = chmap->map[i];
197         }
198         return 0;
199 }
200 
201 /* create a chmap kctl assigned to the given USB substream */
202 static int add_chmap(struct snd_pcm *pcm, int stream,
203                      struct snd_usb_substream *subs)
204 {
205         struct audioformat *fp;
206         struct snd_pcm_chmap *chmap;
207         struct snd_kcontrol *kctl;
208         int err;
209 
210         list_for_each_entry(fp, &subs->fmt_list, list)
211                 if (fp->chmap)
212                         goto ok;
213         /* no chmap is found */
214         return 0;
215 
216  ok:
217         err = snd_pcm_add_chmap_ctls(pcm, stream, NULL, 0, 0, &chmap);
218         if (err < 0)
219                 return err;
220 
221         /* override handlers */
222         chmap->private_data = subs;
223         kctl = chmap->kctl;
224         kctl->info = usb_chmap_ctl_info;
225         kctl->get = usb_chmap_ctl_get;
226         kctl->tlv.c = usb_chmap_ctl_tlv;
227 
228         return 0;
229 }
230 
231 /* convert from USB ChannelConfig bits to ALSA chmap element */
232 static struct snd_pcm_chmap_elem *convert_chmap(int channels, unsigned int bits,
233                                                 int protocol)
234 {
235         static unsigned int uac1_maps[] = {
236                 SNDRV_CHMAP_FL,         /* left front */
237                 SNDRV_CHMAP_FR,         /* right front */
238                 SNDRV_CHMAP_FC,         /* center front */
239                 SNDRV_CHMAP_LFE,        /* LFE */
240                 SNDRV_CHMAP_SL,         /* left surround */
241                 SNDRV_CHMAP_SR,         /* right surround */
242                 SNDRV_CHMAP_FLC,        /* left of center */
243                 SNDRV_CHMAP_FRC,        /* right of center */
244                 SNDRV_CHMAP_RC,         /* surround */
245                 SNDRV_CHMAP_SL,         /* side left */
246                 SNDRV_CHMAP_SR,         /* side right */
247                 SNDRV_CHMAP_TC,         /* top */
248                 0 /* terminator */
249         };
250         static unsigned int uac2_maps[] = {
251                 SNDRV_CHMAP_FL,         /* front left */
252                 SNDRV_CHMAP_FR,         /* front right */
253                 SNDRV_CHMAP_FC,         /* front center */
254                 SNDRV_CHMAP_LFE,        /* LFE */
255                 SNDRV_CHMAP_RL,         /* back left */
256                 SNDRV_CHMAP_RR,         /* back right */
257                 SNDRV_CHMAP_FLC,        /* front left of center */
258                 SNDRV_CHMAP_FRC,        /* front right of center */
259                 SNDRV_CHMAP_RC,         /* back center */
260                 SNDRV_CHMAP_SL,         /* side left */
261                 SNDRV_CHMAP_SR,         /* side right */
262                 SNDRV_CHMAP_TC,         /* top center */
263                 SNDRV_CHMAP_TFL,        /* top front left */
264                 SNDRV_CHMAP_TFC,        /* top front center */
265                 SNDRV_CHMAP_TFR,        /* top front right */
266                 SNDRV_CHMAP_TRL,        /* top back left */
267                 SNDRV_CHMAP_TRC,        /* top back center */
268                 SNDRV_CHMAP_TRR,        /* top back right */
269                 SNDRV_CHMAP_TFLC,       /* top front left of center */
270                 SNDRV_CHMAP_TFRC,       /* top front right of center */
271                 SNDRV_CHMAP_LLFE,       /* left LFE */
272                 SNDRV_CHMAP_RLFE,       /* right LFE */
273                 SNDRV_CHMAP_TSL,        /* top side left */
274                 SNDRV_CHMAP_TSR,        /* top side right */
275                 SNDRV_CHMAP_BC,         /* bottom center */
276                 SNDRV_CHMAP_RLC,        /* back left of center */
277                 SNDRV_CHMAP_RRC,        /* back right of center */
278                 0 /* terminator */
279         };
280         struct snd_pcm_chmap_elem *chmap;
281         const unsigned int *maps;
282         int c;
283 
284         if (channels > ARRAY_SIZE(chmap->map))
285                 return NULL;
286 
287         chmap = kzalloc(sizeof(*chmap), GFP_KERNEL);
288         if (!chmap)
289                 return NULL;
290 
291         maps = protocol == UAC_VERSION_2 ? uac2_maps : uac1_maps;
292         chmap->channels = channels;
293         c = 0;
294 
295         if (bits) {
296                 for (; bits && *maps; maps++, bits >>= 1)
297                         if (bits & 1)
298                                 chmap->map[c++] = *maps;
299         } else {
300                 /* If we're missing wChannelConfig, then guess something
301                     to make sure the channel map is not skipped entirely */
302                 if (channels == 1)
303                         chmap->map[c++] = SNDRV_CHMAP_MONO;
304                 else
305                         for (; c < channels && *maps; maps++)
306                                 chmap->map[c++] = *maps;
307         }
308 
309         for (; c < channels; c++)
310                 chmap->map[c] = SNDRV_CHMAP_UNKNOWN;
311 
312         return chmap;
313 }
314 
315 /*
316  * add this endpoint to the chip instance.
317  * if a stream with the same endpoint already exists, append to it.
318  * if not, create a new pcm stream.
319  */
320 int snd_usb_add_audio_stream(struct snd_usb_audio *chip,
321                              int stream,
322                              struct audioformat *fp)
323 {
324         struct snd_usb_stream *as;
325         struct snd_usb_substream *subs;
326         struct snd_pcm *pcm;
327         int err;
328 
329         list_for_each_entry(as, &chip->pcm_list, list) {
330                 if (as->fmt_type != fp->fmt_type)
331                         continue;
332                 subs = &as->substream[stream];
333                 if (subs->ep_num == fp->endpoint) {
334                         list_add_tail(&fp->list, &subs->fmt_list);
335                         subs->num_formats++;
336                         subs->formats |= fp->formats;
337                         return 0;
338                 }
339         }
340         /* look for an empty stream */
341         list_for_each_entry(as, &chip->pcm_list, list) {
342                 if (as->fmt_type != fp->fmt_type)
343                         continue;
344                 subs = &as->substream[stream];
345                 if (subs->ep_num)
346                         continue;
347                 err = snd_pcm_new_stream(as->pcm, stream, 1);
348                 if (err < 0)
349                         return err;
350                 snd_usb_init_substream(as, stream, fp);
351                 return add_chmap(as->pcm, stream, subs);
352         }
353 
354         /* create a new pcm */
355         as = kzalloc(sizeof(*as), GFP_KERNEL);
356         if (!as)
357                 return -ENOMEM;
358         as->pcm_index = chip->pcm_devs;
359         as->chip = chip;
360         as->fmt_type = fp->fmt_type;
361         err = snd_pcm_new(chip->card, "USB Audio", chip->pcm_devs,
362                           stream == SNDRV_PCM_STREAM_PLAYBACK ? 1 : 0,
363                           stream == SNDRV_PCM_STREAM_PLAYBACK ? 0 : 1,
364                           &pcm);
365         if (err < 0) {
366                 kfree(as);
367                 return err;
368         }
369         as->pcm = pcm;
370         pcm->private_data = as;
371         pcm->private_free = snd_usb_audio_pcm_free;
372         pcm->info_flags = 0;
373         if (chip->pcm_devs > 0)
374                 sprintf(pcm->name, "USB Audio #%d", chip->pcm_devs);
375         else
376                 strcpy(pcm->name, "USB Audio");
377 
378         snd_usb_init_substream(as, stream, fp);
379 
380         list_add(&as->list, &chip->pcm_list);
381         chip->pcm_devs++;
382 
383         snd_usb_proc_pcm_format_add(as);
384 
385         return add_chmap(pcm, stream, &as->substream[stream]);
386 }
387 
388 static int parse_uac_endpoint_attributes(struct snd_usb_audio *chip,
389                                          struct usb_host_interface *alts,
390                                          int protocol, int iface_no)
391 {
392         /* parsed with a v1 header here. that's ok as we only look at the
393          * header first which is the same for both versions */
394         struct uac_iso_endpoint_descriptor *csep;
395         struct usb_interface_descriptor *altsd = get_iface_desc(alts);
396         int attributes = 0;
397 
398         csep = snd_usb_find_desc(alts->endpoint[0].extra, alts->endpoint[0].extralen, NULL, USB_DT_CS_ENDPOINT);
399 
400         /* Creamware Noah has this descriptor after the 2nd endpoint */
401         if (!csep && altsd->bNumEndpoints >= 2)
402                 csep = snd_usb_find_desc(alts->endpoint[1].extra, alts->endpoint[1].extralen, NULL, USB_DT_CS_ENDPOINT);
403 
404         /*
405          * If we can't locate the USB_DT_CS_ENDPOINT descriptor in the extra
406          * bytes after the first endpoint, go search the entire interface.
407          * Some devices have it directly *before* the standard endpoint.
408          */
409         if (!csep)
410                 csep = snd_usb_find_desc(alts->extra, alts->extralen, NULL, USB_DT_CS_ENDPOINT);
411 
412         if (!csep || csep->bLength < 7 ||
413             csep->bDescriptorSubtype != UAC_EP_GENERAL) {
414                 usb_audio_warn(chip,
415                                "%u:%d : no or invalid class specific endpoint descriptor\n",
416                                iface_no, altsd->bAlternateSetting);
417                 return 0;
418         }
419 
420         if (protocol == UAC_VERSION_1) {
421                 attributes = csep->bmAttributes;
422         } else {
423                 struct uac2_iso_endpoint_descriptor *csep2 =
424                         (struct uac2_iso_endpoint_descriptor *) csep;
425 
426                 attributes = csep->bmAttributes & UAC_EP_CS_ATTR_FILL_MAX;
427 
428                 /* emulate the endpoint attributes of a v1 device */
429                 if (csep2->bmControls & UAC2_CONTROL_PITCH)
430                         attributes |= UAC_EP_CS_ATTR_PITCH_CONTROL;
431         }
432 
433         return attributes;
434 }
435 
436 /* find an input terminal descriptor (either UAC1 or UAC2) with the given
437  * terminal id
438  */
439 static void *
440 snd_usb_find_input_terminal_descriptor(struct usb_host_interface *ctrl_iface,
441                                                int terminal_id)
442 {
443         struct uac2_input_terminal_descriptor *term = NULL;
444 
445         while ((term = snd_usb_find_csint_desc(ctrl_iface->extra,
446                                                ctrl_iface->extralen,
447                                                term, UAC_INPUT_TERMINAL))) {
448                 if (term->bTerminalID == terminal_id)
449                         return term;
450         }
451 
452         return NULL;
453 }
454 
455 static struct uac2_output_terminal_descriptor *
456         snd_usb_find_output_terminal_descriptor(struct usb_host_interface *ctrl_iface,
457                                                 int terminal_id)
458 {
459         struct uac2_output_terminal_descriptor *term = NULL;
460 
461         while ((term = snd_usb_find_csint_desc(ctrl_iface->extra,
462                                                ctrl_iface->extralen,
463                                                term, UAC_OUTPUT_TERMINAL))) {
464                 if (term->bTerminalID == terminal_id)
465                         return term;
466         }
467 
468         return NULL;
469 }
470 
471 int snd_usb_parse_audio_interface(struct snd_usb_audio *chip, int iface_no)
472 {
473         struct usb_device *dev;
474         struct usb_interface *iface;
475         struct usb_host_interface *alts;
476         struct usb_interface_descriptor *altsd;
477         int i, altno, err, stream;
478         unsigned int format = 0, num_channels = 0;
479         struct audioformat *fp = NULL;
480         int num, protocol, clock = 0;
481         struct uac_format_type_i_continuous_descriptor *fmt;
482         unsigned int chconfig;
483 
484         dev = chip->dev;
485 
486         /* parse the interface's altsettings */
487         iface = usb_ifnum_to_if(dev, iface_no);
488 
489         num = iface->num_altsetting;
490 
491         /*
492          * Dallas DS4201 workaround: It presents 5 altsettings, but the last
493          * one misses syncpipe, and does not produce any sound.
494          */
495         if (chip->usb_id == USB_ID(0x04fa, 0x4201))
496                 num = 4;
497 
498         for (i = 0; i < num; i++) {
499                 alts = &iface->altsetting[i];
500                 altsd = get_iface_desc(alts);
501                 protocol = altsd->bInterfaceProtocol;
502                 /* skip invalid one */
503                 if (((altsd->bInterfaceClass != USB_CLASS_AUDIO ||
504                       (altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING &&
505                        altsd->bInterfaceSubClass != USB_SUBCLASS_VENDOR_SPEC)) &&
506                      altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
507                     altsd->bNumEndpoints < 1 ||
508                     le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize) == 0)
509                         continue;
510                 /* must be isochronous */
511                 if ((get_endpoint(alts, 0)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) !=
512                     USB_ENDPOINT_XFER_ISOC)
513                         continue;
514                 /* check direction */
515                 stream = (get_endpoint(alts, 0)->bEndpointAddress & USB_DIR_IN) ?
516                         SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
517                 altno = altsd->bAlternateSetting;
518 
519                 if (snd_usb_apply_interface_quirk(chip, iface_no, altno))
520                         continue;
521 
522                 /*
523                  * Roland audio streaming interfaces are marked with protocols
524                  * 0/1/2, but are UAC 1 compatible.
525                  */
526                 if (USB_ID_VENDOR(chip->usb_id) == 0x0582 &&
527                     altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
528                     protocol <= 2)
529                         protocol = UAC_VERSION_1;
530 
531                 chconfig = 0;
532                 /* get audio formats */
533                 switch (protocol) {
534                 default:
535                         dev_dbg(&dev->dev, "%u:%d: unknown interface protocol %#02x, assuming v1\n",
536                                 iface_no, altno, protocol);
537                         protocol = UAC_VERSION_1;
538                         /* fall through */
539 
540                 case UAC_VERSION_1: {
541                         struct uac1_as_header_descriptor *as =
542                                 snd_usb_find_csint_desc(alts->extra, alts->extralen, NULL, UAC_AS_GENERAL);
543                         struct uac_input_terminal_descriptor *iterm;
544 
545                         if (!as) {
546                                 dev_err(&dev->dev,
547                                         "%u:%d : UAC_AS_GENERAL descriptor not found\n",
548                                         iface_no, altno);
549                                 continue;
550                         }
551 
552                         if (as->bLength < sizeof(*as)) {
553                                 dev_err(&dev->dev,
554                                         "%u:%d : invalid UAC_AS_GENERAL desc\n",
555                                         iface_no, altno);
556                                 continue;
557                         }
558 
559                         format = le16_to_cpu(as->wFormatTag); /* remember the format value */
560 
561                         iterm = snd_usb_find_input_terminal_descriptor(chip->ctrl_intf,
562                                                                        as->bTerminalLink);
563                         if (iterm) {
564                                 num_channels = iterm->bNrChannels;
565                                 chconfig = le16_to_cpu(iterm->wChannelConfig);
566                         }
567 
568                         break;
569                 }
570 
571                 case UAC_VERSION_2: {
572                         struct uac2_input_terminal_descriptor *input_term;
573                         struct uac2_output_terminal_descriptor *output_term;
574                         struct uac2_as_header_descriptor *as =
575                                 snd_usb_find_csint_desc(alts->extra, alts->extralen, NULL, UAC_AS_GENERAL);
576 
577                         if (!as) {
578                                 dev_err(&dev->dev,
579                                         "%u:%d : UAC_AS_GENERAL descriptor not found\n",
580                                         iface_no, altno);
581                                 continue;
582                         }
583 
584                         if (as->bLength < sizeof(*as)) {
585                                 dev_err(&dev->dev,
586                                         "%u:%d : invalid UAC_AS_GENERAL desc\n",
587                                         iface_no, altno);
588                                 continue;
589                         }
590 
591                         num_channels = as->bNrChannels;
592                         format = le32_to_cpu(as->bmFormats);
593                         chconfig = le32_to_cpu(as->bmChannelConfig);
594 
595                         /* lookup the terminal associated to this interface
596                          * to extract the clock */
597                         input_term = snd_usb_find_input_terminal_descriptor(chip->ctrl_intf,
598                                                                             as->bTerminalLink);
599                         if (input_term) {
600                                 clock = input_term->bCSourceID;
601                                 if (!chconfig && (num_channels == input_term->bNrChannels))
602                                         chconfig = le32_to_cpu(input_term->bmChannelConfig);
603                                 break;
604                         }
605 
606                         output_term = snd_usb_find_output_terminal_descriptor(chip->ctrl_intf,
607                                                                               as->bTerminalLink);
608                         if (output_term) {
609                                 clock = output_term->bCSourceID;
610                                 break;
611                         }
612 
613                         dev_err(&dev->dev,
614                                 "%u:%d : bogus bTerminalLink %d\n",
615                                 iface_no, altno, as->bTerminalLink);
616                         continue;
617                 }
618                 }
619 
620                 /* get format type */
621                 fmt = snd_usb_find_csint_desc(alts->extra, alts->extralen, NULL, UAC_FORMAT_TYPE);
622                 if (!fmt) {
623                         dev_err(&dev->dev,
624                                 "%u:%d : no UAC_FORMAT_TYPE desc\n",
625                                 iface_no, altno);
626                         continue;
627                 }
628                 if (((protocol == UAC_VERSION_1) && (fmt->bLength < 8)) ||
629                     ((protocol == UAC_VERSION_2) && (fmt->bLength < 6))) {
630                         dev_err(&dev->dev,
631                                 "%u:%d : invalid UAC_FORMAT_TYPE desc\n",
632                                 iface_no, altno);
633                         continue;
634                 }
635 
636                 /*
637                  * Blue Microphones workaround: The last altsetting is identical
638                  * with the previous one, except for a larger packet size, but
639                  * is actually a mislabeled two-channel setting; ignore it.
640                  */
641                 if (fmt->bNrChannels == 1 &&
642                     fmt->bSubframeSize == 2 &&
643                     altno == 2 && num == 3 &&
644                     fp && fp->altsetting == 1 && fp->channels == 1 &&
645                     fp->formats == SNDRV_PCM_FMTBIT_S16_LE &&
646                     protocol == UAC_VERSION_1 &&
647                     le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize) ==
648                                                         fp->maxpacksize * 2)
649                         continue;
650 
651                 fp = kzalloc(sizeof(*fp), GFP_KERNEL);
652                 if (! fp) {
653                         dev_err(&dev->dev, "cannot malloc\n");
654                         return -ENOMEM;
655                 }
656 
657                 fp->iface = iface_no;
658                 fp->altsetting = altno;
659                 fp->altset_idx = i;
660                 fp->endpoint = get_endpoint(alts, 0)->bEndpointAddress;
661                 fp->ep_attr = get_endpoint(alts, 0)->bmAttributes;
662                 fp->datainterval = snd_usb_parse_datainterval(chip, alts);
663                 fp->protocol = protocol;
664                 fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
665                 fp->channels = num_channels;
666                 if (snd_usb_get_speed(dev) == USB_SPEED_HIGH)
667                         fp->maxpacksize = (((fp->maxpacksize >> 11) & 3) + 1)
668                                         * (fp->maxpacksize & 0x7ff);
669                 fp->attributes = parse_uac_endpoint_attributes(chip, alts, protocol, iface_no);
670                 fp->clock = clock;
671 
672                 /* some quirks for attributes here */
673 
674                 switch (chip->usb_id) {
675                 case USB_ID(0x0a92, 0x0053): /* AudioTrak Optoplay */
676                         /* Optoplay sets the sample rate attribute although
677                          * it seems not supporting it in fact.
678                          */
679                         fp->attributes &= ~UAC_EP_CS_ATTR_SAMPLE_RATE;
680                         break;
681                 case USB_ID(0x041e, 0x3020): /* Creative SB Audigy 2 NX */
682                 case USB_ID(0x0763, 0x2003): /* M-Audio Audiophile USB */
683                         /* doesn't set the sample rate attribute, but supports it */
684                         fp->attributes |= UAC_EP_CS_ATTR_SAMPLE_RATE;
685                         break;
686                 case USB_ID(0x0763, 0x2001):  /* M-Audio Quattro USB */
687                 case USB_ID(0x0763, 0x2012):  /* M-Audio Fast Track Pro USB */
688                 case USB_ID(0x047f, 0x0ca1): /* plantronics headset */
689                 case USB_ID(0x077d, 0x07af): /* Griffin iMic (note that there is
690                                                 an older model 77d:223) */
691                 /*
692                  * plantronics headset and Griffin iMic have set adaptive-in
693                  * although it's really not...
694                  */
695                         fp->ep_attr &= ~USB_ENDPOINT_SYNCTYPE;
696                         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
697                                 fp->ep_attr |= USB_ENDPOINT_SYNC_ADAPTIVE;
698                         else
699                                 fp->ep_attr |= USB_ENDPOINT_SYNC_SYNC;
700                         break;
701                 }
702 
703                 /* ok, let's parse further... */
704                 if (snd_usb_parse_audio_format(chip, fp, format, fmt, stream) < 0) {
705                         kfree(fp->rate_table);
706                         kfree(fp);
707                         fp = NULL;
708                         continue;
709                 }
710 
711                 /* Create chmap */
712                 if (fp->channels != num_channels)
713                         chconfig = 0;
714                 fp->chmap = convert_chmap(fp->channels, chconfig, protocol);
715 
716                 dev_dbg(&dev->dev, "%u:%d: add audio endpoint %#x\n", iface_no, altno, fp->endpoint);
717                 err = snd_usb_add_audio_stream(chip, stream, fp);
718                 if (err < 0) {
719                         kfree(fp->rate_table);
720                         kfree(fp->chmap);
721                         kfree(fp);
722                         return err;
723                 }
724                 /* try to set the interface... */
725                 usb_set_interface(chip->dev, iface_no, altno);
726                 snd_usb_init_pitch(chip, iface_no, alts, fp);
727                 snd_usb_init_sample_rate(chip, iface_no, alts, fp, fp->rate_max);
728         }
729         return 0;
730 }
731 
732 

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