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

Version: ~ [ linux-5.4-rc7 ] ~ [ linux-5.3.11 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.84 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.154 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.201 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.201 ] ~ [ 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-3.16.77 ] ~ [ 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->tx_length_quirk = as->chip->tx_length_quirk;
 96         subs->speed = snd_usb_get_speed(subs->dev);
 97         subs->pkt_offset_adj = 0;
 98 
 99         snd_usb_set_pcm_ops(as->pcm, stream);
100 
101         list_add_tail(&fp->list, &subs->fmt_list);
102         subs->formats |= fp->formats;
103         subs->num_formats++;
104         subs->fmt_type = fp->fmt_type;
105         subs->ep_num = fp->endpoint;
106         if (fp->channels > subs->channels_max)
107                 subs->channels_max = fp->channels;
108 }
109 
110 /* kctl callbacks for usb-audio channel maps */
111 static int usb_chmap_ctl_info(struct snd_kcontrol *kcontrol,
112                               struct snd_ctl_elem_info *uinfo)
113 {
114         struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
115         struct snd_usb_substream *subs = info->private_data;
116 
117         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
118         uinfo->count = subs->channels_max;
119         uinfo->value.integer.min = 0;
120         uinfo->value.integer.max = SNDRV_CHMAP_LAST;
121         return 0;
122 }
123 
124 /* check whether a duplicated entry exists in the audiofmt list */
125 static bool have_dup_chmap(struct snd_usb_substream *subs,
126                            struct audioformat *fp)
127 {
128         struct audioformat *prev = fp;
129 
130         list_for_each_entry_continue_reverse(prev, &subs->fmt_list, list) {
131                 if (prev->chmap &&
132                     !memcmp(prev->chmap, fp->chmap, sizeof(*fp->chmap)))
133                         return true;
134         }
135         return false;
136 }
137 
138 static int usb_chmap_ctl_tlv(struct snd_kcontrol *kcontrol, int op_flag,
139                              unsigned int size, unsigned int __user *tlv)
140 {
141         struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
142         struct snd_usb_substream *subs = info->private_data;
143         struct audioformat *fp;
144         unsigned int __user *dst;
145         int count = 0;
146 
147         if (size < 8)
148                 return -ENOMEM;
149         if (put_user(SNDRV_CTL_TLVT_CONTAINER, tlv))
150                 return -EFAULT;
151         size -= 8;
152         dst = tlv + 2;
153         list_for_each_entry(fp, &subs->fmt_list, list) {
154                 int i, ch_bytes;
155 
156                 if (!fp->chmap)
157                         continue;
158                 if (have_dup_chmap(subs, fp))
159                         continue;
160                 /* copy the entry */
161                 ch_bytes = fp->chmap->channels * 4;
162                 if (size < 8 + ch_bytes)
163                         return -ENOMEM;
164                 if (put_user(SNDRV_CTL_TLVT_CHMAP_FIXED, dst) ||
165                     put_user(ch_bytes, dst + 1))
166                         return -EFAULT;
167                 dst += 2;
168                 for (i = 0; i < fp->chmap->channels; i++, dst++) {
169                         if (put_user(fp->chmap->map[i], dst))
170                                 return -EFAULT;
171                 }
172 
173                 count += 8 + ch_bytes;
174                 size -= 8 + ch_bytes;
175         }
176         if (put_user(count, tlv + 1))
177                 return -EFAULT;
178         return 0;
179 }
180 
181 static int usb_chmap_ctl_get(struct snd_kcontrol *kcontrol,
182                              struct snd_ctl_elem_value *ucontrol)
183 {
184         struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
185         struct snd_usb_substream *subs = info->private_data;
186         struct snd_pcm_chmap_elem *chmap = NULL;
187         int i;
188 
189         memset(ucontrol->value.integer.value, 0,
190                sizeof(ucontrol->value.integer.value));
191         if (subs->cur_audiofmt)
192                 chmap = subs->cur_audiofmt->chmap;
193         if (chmap) {
194                 for (i = 0; i < chmap->channels; i++)
195                         ucontrol->value.integer.value[i] = chmap->map[i];
196         }
197         return 0;
198 }
199 
200 /* create a chmap kctl assigned to the given USB substream */
201 static int add_chmap(struct snd_pcm *pcm, int stream,
202                      struct snd_usb_substream *subs)
203 {
204         struct audioformat *fp;
205         struct snd_pcm_chmap *chmap;
206         struct snd_kcontrol *kctl;
207         int err;
208 
209         list_for_each_entry(fp, &subs->fmt_list, list)
210                 if (fp->chmap)
211                         goto ok;
212         /* no chmap is found */
213         return 0;
214 
215  ok:
216         err = snd_pcm_add_chmap_ctls(pcm, stream, NULL, 0, 0, &chmap);
217         if (err < 0)
218                 return err;
219 
220         /* override handlers */
221         chmap->private_data = subs;
222         kctl = chmap->kctl;
223         kctl->info = usb_chmap_ctl_info;
224         kctl->get = usb_chmap_ctl_get;
225         kctl->tlv.c = usb_chmap_ctl_tlv;
226 
227         return 0;
228 }
229 
230 /* convert from USB ChannelConfig bits to ALSA chmap element */
231 static struct snd_pcm_chmap_elem *convert_chmap(int channels, unsigned int bits,
232                                                 int protocol)
233 {
234         static unsigned int uac1_maps[] = {
235                 SNDRV_CHMAP_FL,         /* left front */
236                 SNDRV_CHMAP_FR,         /* right front */
237                 SNDRV_CHMAP_FC,         /* center front */
238                 SNDRV_CHMAP_LFE,        /* LFE */
239                 SNDRV_CHMAP_SL,         /* left surround */
240                 SNDRV_CHMAP_SR,         /* right surround */
241                 SNDRV_CHMAP_FLC,        /* left of center */
242                 SNDRV_CHMAP_FRC,        /* right of center */
243                 SNDRV_CHMAP_RC,         /* surround */
244                 SNDRV_CHMAP_SL,         /* side left */
245                 SNDRV_CHMAP_SR,         /* side right */
246                 SNDRV_CHMAP_TC,         /* top */
247                 0 /* terminator */
248         };
249         static unsigned int uac2_maps[] = {
250                 SNDRV_CHMAP_FL,         /* front left */
251                 SNDRV_CHMAP_FR,         /* front right */
252                 SNDRV_CHMAP_FC,         /* front center */
253                 SNDRV_CHMAP_LFE,        /* LFE */
254                 SNDRV_CHMAP_RL,         /* back left */
255                 SNDRV_CHMAP_RR,         /* back right */
256                 SNDRV_CHMAP_FLC,        /* front left of center */
257                 SNDRV_CHMAP_FRC,        /* front right of center */
258                 SNDRV_CHMAP_RC,         /* back center */
259                 SNDRV_CHMAP_SL,         /* side left */
260                 SNDRV_CHMAP_SR,         /* side right */
261                 SNDRV_CHMAP_TC,         /* top center */
262                 SNDRV_CHMAP_TFL,        /* top front left */
263                 SNDRV_CHMAP_TFC,        /* top front center */
264                 SNDRV_CHMAP_TFR,        /* top front right */
265                 SNDRV_CHMAP_TRL,        /* top back left */
266                 SNDRV_CHMAP_TRC,        /* top back center */
267                 SNDRV_CHMAP_TRR,        /* top back right */
268                 SNDRV_CHMAP_TFLC,       /* top front left of center */
269                 SNDRV_CHMAP_TFRC,       /* top front right of center */
270                 SNDRV_CHMAP_LLFE,       /* left LFE */
271                 SNDRV_CHMAP_RLFE,       /* right LFE */
272                 SNDRV_CHMAP_TSL,        /* top side left */
273                 SNDRV_CHMAP_TSR,        /* top side right */
274                 SNDRV_CHMAP_BC,         /* bottom center */
275                 SNDRV_CHMAP_RLC,        /* back left of center */
276                 SNDRV_CHMAP_RRC,        /* back right of center */
277                 0 /* terminator */
278         };
279         struct snd_pcm_chmap_elem *chmap;
280         const unsigned int *maps;
281         int c;
282 
283         if (channels > ARRAY_SIZE(chmap->map))
284                 return NULL;
285 
286         chmap = kzalloc(sizeof(*chmap), GFP_KERNEL);
287         if (!chmap)
288                 return NULL;
289 
290         maps = protocol == UAC_VERSION_2 ? uac2_maps : uac1_maps;
291         chmap->channels = channels;
292         c = 0;
293 
294         if (bits) {
295                 for (; bits && *maps; maps++, bits >>= 1)
296                         if (bits & 1)
297                                 chmap->map[c++] = *maps;
298         } else {
299                 /* If we're missing wChannelConfig, then guess something
300                     to make sure the channel map is not skipped entirely */
301                 if (channels == 1)
302                         chmap->map[c++] = SNDRV_CHMAP_MONO;
303                 else
304                         for (; c < channels && *maps; maps++)
305                                 chmap->map[c++] = *maps;
306         }
307 
308         for (; c < channels; c++)
309                 chmap->map[c] = SNDRV_CHMAP_UNKNOWN;
310 
311         return chmap;
312 }
313 
314 /*
315  * add this endpoint to the chip instance.
316  * if a stream with the same endpoint already exists, append to it.
317  * if not, create a new pcm stream. note, fp is added to the substream
318  * fmt_list and will be freed on the chip instance release. do not free
319  * fp or do remove it from the substream fmt_list to avoid double-free.
320  */
321 int snd_usb_add_audio_stream(struct snd_usb_audio *chip,
322                              int stream,
323                              struct audioformat *fp)
324 {
325         struct snd_usb_stream *as;
326         struct snd_usb_substream *subs;
327         struct snd_pcm *pcm;
328         int err;
329 
330         list_for_each_entry(as, &chip->pcm_list, list) {
331                 if (as->fmt_type != fp->fmt_type)
332                         continue;
333                 subs = &as->substream[stream];
334                 if (subs->ep_num == fp->endpoint) {
335                         list_add_tail(&fp->list, &subs->fmt_list);
336                         subs->num_formats++;
337                         subs->formats |= fp->formats;
338                         return 0;
339                 }
340         }
341         /* look for an empty stream */
342         list_for_each_entry(as, &chip->pcm_list, list) {
343                 if (as->fmt_type != fp->fmt_type)
344                         continue;
345                 subs = &as->substream[stream];
346                 if (subs->ep_num)
347                         continue;
348                 err = snd_pcm_new_stream(as->pcm, stream, 1);
349                 if (err < 0)
350                         return err;
351                 snd_usb_init_substream(as, stream, fp);
352                 return add_chmap(as->pcm, stream, subs);
353         }
354 
355         /* create a new pcm */
356         as = kzalloc(sizeof(*as), GFP_KERNEL);
357         if (!as)
358                 return -ENOMEM;
359         as->pcm_index = chip->pcm_devs;
360         as->chip = chip;
361         as->fmt_type = fp->fmt_type;
362         err = snd_pcm_new(chip->card, "USB Audio", chip->pcm_devs,
363                           stream == SNDRV_PCM_STREAM_PLAYBACK ? 1 : 0,
364                           stream == SNDRV_PCM_STREAM_PLAYBACK ? 0 : 1,
365                           &pcm);
366         if (err < 0) {
367                 kfree(as);
368                 return err;
369         }
370         as->pcm = pcm;
371         pcm->private_data = as;
372         pcm->private_free = snd_usb_audio_pcm_free;
373         pcm->info_flags = 0;
374         if (chip->pcm_devs > 0)
375                 sprintf(pcm->name, "USB Audio #%d", chip->pcm_devs);
376         else
377                 strcpy(pcm->name, "USB Audio");
378 
379         snd_usb_init_substream(as, stream, fp);
380 
381         /*
382          * Keep using head insertion for M-Audio Audiophile USB (tm) which has a
383          * fix to swap capture stream order in conf/cards/USB-audio.conf
384          */
385         if (chip->usb_id == USB_ID(0x0763, 0x2003))
386                 list_add(&as->list, &chip->pcm_list);
387         else
388                 list_add_tail(&as->list, &chip->pcm_list);
389 
390         chip->pcm_devs++;
391 
392         snd_usb_proc_pcm_format_add(as);
393 
394         return add_chmap(pcm, stream, &as->substream[stream]);
395 }
396 
397 static int parse_uac_endpoint_attributes(struct snd_usb_audio *chip,
398                                          struct usb_host_interface *alts,
399                                          int protocol, int iface_no)
400 {
401         /* parsed with a v1 header here. that's ok as we only look at the
402          * header first which is the same for both versions */
403         struct uac_iso_endpoint_descriptor *csep;
404         struct usb_interface_descriptor *altsd = get_iface_desc(alts);
405         int attributes = 0;
406 
407         csep = snd_usb_find_desc(alts->endpoint[0].extra, alts->endpoint[0].extralen, NULL, USB_DT_CS_ENDPOINT);
408 
409         /* Creamware Noah has this descriptor after the 2nd endpoint */
410         if (!csep && altsd->bNumEndpoints >= 2)
411                 csep = snd_usb_find_desc(alts->endpoint[1].extra, alts->endpoint[1].extralen, NULL, USB_DT_CS_ENDPOINT);
412 
413         /*
414          * If we can't locate the USB_DT_CS_ENDPOINT descriptor in the extra
415          * bytes after the first endpoint, go search the entire interface.
416          * Some devices have it directly *before* the standard endpoint.
417          */
418         if (!csep)
419                 csep = snd_usb_find_desc(alts->extra, alts->extralen, NULL, USB_DT_CS_ENDPOINT);
420 
421         if (!csep || csep->bLength < 7 ||
422             csep->bDescriptorSubtype != UAC_EP_GENERAL) {
423                 usb_audio_warn(chip,
424                                "%u:%d : no or invalid class specific endpoint descriptor\n",
425                                iface_no, altsd->bAlternateSetting);
426                 return 0;
427         }
428 
429         if (protocol == UAC_VERSION_1) {
430                 attributes = csep->bmAttributes;
431         } else {
432                 struct uac2_iso_endpoint_descriptor *csep2 =
433                         (struct uac2_iso_endpoint_descriptor *) csep;
434 
435                 attributes = csep->bmAttributes & UAC_EP_CS_ATTR_FILL_MAX;
436 
437                 /* emulate the endpoint attributes of a v1 device */
438                 if (csep2->bmControls & UAC2_CONTROL_PITCH)
439                         attributes |= UAC_EP_CS_ATTR_PITCH_CONTROL;
440         }
441 
442         return attributes;
443 }
444 
445 /* find an input terminal descriptor (either UAC1 or UAC2) with the given
446  * terminal id
447  */
448 static void *
449 snd_usb_find_input_terminal_descriptor(struct usb_host_interface *ctrl_iface,
450                                                int terminal_id)
451 {
452         struct uac2_input_terminal_descriptor *term = NULL;
453 
454         while ((term = snd_usb_find_csint_desc(ctrl_iface->extra,
455                                                ctrl_iface->extralen,
456                                                term, UAC_INPUT_TERMINAL))) {
457                 if (term->bTerminalID == terminal_id)
458                         return term;
459         }
460 
461         return NULL;
462 }
463 
464 static struct uac2_output_terminal_descriptor *
465         snd_usb_find_output_terminal_descriptor(struct usb_host_interface *ctrl_iface,
466                                                 int terminal_id)
467 {
468         struct uac2_output_terminal_descriptor *term = NULL;
469 
470         while ((term = snd_usb_find_csint_desc(ctrl_iface->extra,
471                                                ctrl_iface->extralen,
472                                                term, UAC_OUTPUT_TERMINAL))) {
473                 if (term->bTerminalID == terminal_id)
474                         return term;
475         }
476 
477         return NULL;
478 }
479 
480 int snd_usb_parse_audio_interface(struct snd_usb_audio *chip, int iface_no)
481 {
482         struct usb_device *dev;
483         struct usb_interface *iface;
484         struct usb_host_interface *alts;
485         struct usb_interface_descriptor *altsd;
486         int i, altno, err, stream;
487         unsigned int format = 0, num_channels = 0;
488         struct audioformat *fp = NULL;
489         int num, protocol, clock = 0;
490         struct uac_format_type_i_continuous_descriptor *fmt;
491         unsigned int chconfig;
492 
493         dev = chip->dev;
494 
495         /* parse the interface's altsettings */
496         iface = usb_ifnum_to_if(dev, iface_no);
497 
498         num = iface->num_altsetting;
499 
500         /*
501          * Dallas DS4201 workaround: It presents 5 altsettings, but the last
502          * one misses syncpipe, and does not produce any sound.
503          */
504         if (chip->usb_id == USB_ID(0x04fa, 0x4201))
505                 num = 4;
506 
507         for (i = 0; i < num; i++) {
508                 alts = &iface->altsetting[i];
509                 altsd = get_iface_desc(alts);
510                 protocol = altsd->bInterfaceProtocol;
511                 /* skip invalid one */
512                 if (((altsd->bInterfaceClass != USB_CLASS_AUDIO ||
513                       (altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING &&
514                        altsd->bInterfaceSubClass != USB_SUBCLASS_VENDOR_SPEC)) &&
515                      altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
516                     altsd->bNumEndpoints < 1 ||
517                     le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize) == 0)
518                         continue;
519                 /* must be isochronous */
520                 if ((get_endpoint(alts, 0)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) !=
521                     USB_ENDPOINT_XFER_ISOC)
522                         continue;
523                 /* check direction */
524                 stream = (get_endpoint(alts, 0)->bEndpointAddress & USB_DIR_IN) ?
525                         SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
526                 altno = altsd->bAlternateSetting;
527 
528                 if (snd_usb_apply_interface_quirk(chip, iface_no, altno))
529                         continue;
530 
531                 /*
532                  * Roland audio streaming interfaces are marked with protocols
533                  * 0/1/2, but are UAC 1 compatible.
534                  */
535                 if (USB_ID_VENDOR(chip->usb_id) == 0x0582 &&
536                     altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
537                     protocol <= 2)
538                         protocol = UAC_VERSION_1;
539 
540                 chconfig = 0;
541                 /* get audio formats */
542                 switch (protocol) {
543                 default:
544                         dev_dbg(&dev->dev, "%u:%d: unknown interface protocol %#02x, assuming v1\n",
545                                 iface_no, altno, protocol);
546                         protocol = UAC_VERSION_1;
547                         /* fall through */
548 
549                 case UAC_VERSION_1: {
550                         struct uac1_as_header_descriptor *as =
551                                 snd_usb_find_csint_desc(alts->extra, alts->extralen, NULL, UAC_AS_GENERAL);
552                         struct uac_input_terminal_descriptor *iterm;
553 
554                         if (!as) {
555                                 dev_err(&dev->dev,
556                                         "%u:%d : UAC_AS_GENERAL descriptor not found\n",
557                                         iface_no, altno);
558                                 continue;
559                         }
560 
561                         if (as->bLength < sizeof(*as)) {
562                                 dev_err(&dev->dev,
563                                         "%u:%d : invalid UAC_AS_GENERAL desc\n",
564                                         iface_no, altno);
565                                 continue;
566                         }
567 
568                         format = le16_to_cpu(as->wFormatTag); /* remember the format value */
569 
570                         iterm = snd_usb_find_input_terminal_descriptor(chip->ctrl_intf,
571                                                                        as->bTerminalLink);
572                         if (iterm) {
573                                 num_channels = iterm->bNrChannels;
574                                 chconfig = le16_to_cpu(iterm->wChannelConfig);
575                         }
576 
577                         break;
578                 }
579 
580                 case UAC_VERSION_2: {
581                         struct uac2_input_terminal_descriptor *input_term;
582                         struct uac2_output_terminal_descriptor *output_term;
583                         struct uac2_as_header_descriptor *as =
584                                 snd_usb_find_csint_desc(alts->extra, alts->extralen, NULL, UAC_AS_GENERAL);
585 
586                         if (!as) {
587                                 dev_err(&dev->dev,
588                                         "%u:%d : UAC_AS_GENERAL descriptor not found\n",
589                                         iface_no, altno);
590                                 continue;
591                         }
592 
593                         if (as->bLength < sizeof(*as)) {
594                                 dev_err(&dev->dev,
595                                         "%u:%d : invalid UAC_AS_GENERAL desc\n",
596                                         iface_no, altno);
597                                 continue;
598                         }
599 
600                         num_channels = as->bNrChannels;
601                         format = le32_to_cpu(as->bmFormats);
602                         chconfig = le32_to_cpu(as->bmChannelConfig);
603 
604                         /* lookup the terminal associated to this interface
605                          * to extract the clock */
606                         input_term = snd_usb_find_input_terminal_descriptor(chip->ctrl_intf,
607                                                                             as->bTerminalLink);
608                         if (input_term) {
609                                 clock = input_term->bCSourceID;
610                                 if (!chconfig && (num_channels == input_term->bNrChannels))
611                                         chconfig = le32_to_cpu(input_term->bmChannelConfig);
612                                 break;
613                         }
614 
615                         output_term = snd_usb_find_output_terminal_descriptor(chip->ctrl_intf,
616                                                                               as->bTerminalLink);
617                         if (output_term) {
618                                 clock = output_term->bCSourceID;
619                                 break;
620                         }
621 
622                         dev_err(&dev->dev,
623                                 "%u:%d : bogus bTerminalLink %d\n",
624                                 iface_no, altno, as->bTerminalLink);
625                         continue;
626                 }
627                 }
628 
629                 /* get format type */
630                 fmt = snd_usb_find_csint_desc(alts->extra, alts->extralen, NULL, UAC_FORMAT_TYPE);
631                 if (!fmt) {
632                         dev_err(&dev->dev,
633                                 "%u:%d : no UAC_FORMAT_TYPE desc\n",
634                                 iface_no, altno);
635                         continue;
636                 }
637                 if (((protocol == UAC_VERSION_1) && (fmt->bLength < 8)) ||
638                     ((protocol == UAC_VERSION_2) && (fmt->bLength < 6))) {
639                         dev_err(&dev->dev,
640                                 "%u:%d : invalid UAC_FORMAT_TYPE desc\n",
641                                 iface_no, altno);
642                         continue;
643                 }
644 
645                 /*
646                  * Blue Microphones workaround: The last altsetting is identical
647                  * with the previous one, except for a larger packet size, but
648                  * is actually a mislabeled two-channel setting; ignore it.
649                  */
650                 if (fmt->bNrChannels == 1 &&
651                     fmt->bSubframeSize == 2 &&
652                     altno == 2 && num == 3 &&
653                     fp && fp->altsetting == 1 && fp->channels == 1 &&
654                     fp->formats == SNDRV_PCM_FMTBIT_S16_LE &&
655                     protocol == UAC_VERSION_1 &&
656                     le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize) ==
657                                                         fp->maxpacksize * 2)
658                         continue;
659 
660                 fp = kzalloc(sizeof(*fp), GFP_KERNEL);
661                 if (! fp) {
662                         dev_err(&dev->dev, "cannot malloc\n");
663                         return -ENOMEM;
664                 }
665 
666                 fp->iface = iface_no;
667                 fp->altsetting = altno;
668                 fp->altset_idx = i;
669                 fp->endpoint = get_endpoint(alts, 0)->bEndpointAddress;
670                 fp->ep_attr = get_endpoint(alts, 0)->bmAttributes;
671                 fp->datainterval = snd_usb_parse_datainterval(chip, alts);
672                 fp->protocol = protocol;
673                 fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
674                 fp->channels = num_channels;
675                 if (snd_usb_get_speed(dev) == USB_SPEED_HIGH)
676                         fp->maxpacksize = (((fp->maxpacksize >> 11) & 3) + 1)
677                                         * (fp->maxpacksize & 0x7ff);
678                 fp->attributes = parse_uac_endpoint_attributes(chip, alts, protocol, iface_no);
679                 fp->clock = clock;
680                 INIT_LIST_HEAD(&fp->list);
681 
682                 /* some quirks for attributes here */
683 
684                 switch (chip->usb_id) {
685                 case USB_ID(0x0a92, 0x0053): /* AudioTrak Optoplay */
686                         /* Optoplay sets the sample rate attribute although
687                          * it seems not supporting it in fact.
688                          */
689                         fp->attributes &= ~UAC_EP_CS_ATTR_SAMPLE_RATE;
690                         break;
691                 case USB_ID(0x041e, 0x3020): /* Creative SB Audigy 2 NX */
692                 case USB_ID(0x0763, 0x2003): /* M-Audio Audiophile USB */
693                         /* doesn't set the sample rate attribute, but supports it */
694                         fp->attributes |= UAC_EP_CS_ATTR_SAMPLE_RATE;
695                         break;
696                 case USB_ID(0x0763, 0x2001):  /* M-Audio Quattro USB */
697                 case USB_ID(0x0763, 0x2012):  /* M-Audio Fast Track Pro USB */
698                 case USB_ID(0x047f, 0x0ca1): /* plantronics headset */
699                 case USB_ID(0x077d, 0x07af): /* Griffin iMic (note that there is
700                                                 an older model 77d:223) */
701                 /*
702                  * plantronics headset and Griffin iMic have set adaptive-in
703                  * although it's really not...
704                  */
705                         fp->ep_attr &= ~USB_ENDPOINT_SYNCTYPE;
706                         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
707                                 fp->ep_attr |= USB_ENDPOINT_SYNC_ADAPTIVE;
708                         else
709                                 fp->ep_attr |= USB_ENDPOINT_SYNC_SYNC;
710                         break;
711                 }
712 
713                 /* ok, let's parse further... */
714                 if (snd_usb_parse_audio_format(chip, fp, format, fmt, stream) < 0) {
715                         kfree(fp->rate_table);
716                         kfree(fp);
717                         fp = NULL;
718                         continue;
719                 }
720 
721                 /* Create chmap */
722                 if (fp->channels != num_channels)
723                         chconfig = 0;
724                 fp->chmap = convert_chmap(fp->channels, chconfig, protocol);
725 
726                 dev_dbg(&dev->dev, "%u:%d: add audio endpoint %#x\n", iface_no, altno, fp->endpoint);
727                 err = snd_usb_add_audio_stream(chip, stream, fp);
728                 if (err < 0) {
729                         list_del(&fp->list); /* unlink for avoiding double-free */
730                         kfree(fp->rate_table);
731                         kfree(fp->chmap);
732                         kfree(fp);
733                         return err;
734                 }
735                 /* try to set the interface... */
736                 usb_set_interface(chip->dev, iface_no, altno);
737                 snd_usb_init_pitch(chip, iface_no, alts, fp);
738                 snd_usb_init_sample_rate(chip, iface_no, alts, fp, fp->rate_max);
739         }
740         return 0;
741 }
742 
743 

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