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Merge tag 'platform-drivers-x86-v4.9-2' of git://git.infradead.org/users/dvhart/linux...
[linux/fpc-iii.git] / sound / usb / stream.c
blob8e9548bc1f1a922e6ceb5c99450da8ba28ee22ff
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
Linux with added FPC-III support