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23#include <linux/bitops.h>
24#include <linux/init.h>
25#include <linux/list.h>
26#include <linux/slab.h>
27#include <linux/string.h>
28#include <linux/ctype.h>
29#include <linux/usb.h>
30#include <linux/moduleparam.h>
31#include <linux/mutex.h>
32#include <linux/usb/audio.h>
33#include <linux/usb/audio-v2.h>
34#include <linux/usb/audio-v3.h>
35#include <linux/module.h>
36
37#include <sound/control.h>
38#include <sound/core.h>
39#include <sound/info.h>
40#include <sound/pcm.h>
41#include <sound/pcm_params.h>
42#include <sound/initval.h>
43
44#include "usbaudio.h"
45#include "card.h"
46#include "midi.h"
47#include "mixer.h"
48#include "proc.h"
49#include "quirks.h"
50#include "endpoint.h"
51#include "helper.h"
52#include "debug.h"
53#include "pcm.h"
54#include "format.h"
55#include "power.h"
56#include "stream.h"
57#include "media.h"
58
59MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
60MODULE_DESCRIPTION("USB Audio");
61MODULE_LICENSE("GPL");
62MODULE_SUPPORTED_DEVICE("{{Generic,USB Audio}}");
63
64
65static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
66static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
67static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;
68
69static int vid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 };
70static int pid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 };
71static int device_setup[SNDRV_CARDS];
72static bool ignore_ctl_error;
73static bool autoclock = true;
74static char *quirk_alias[SNDRV_CARDS];
75
76bool snd_usb_use_vmalloc = true;
77
78module_param_array(index, int, NULL, 0444);
79MODULE_PARM_DESC(index, "Index value for the USB audio adapter.");
80module_param_array(id, charp, NULL, 0444);
81MODULE_PARM_DESC(id, "ID string for the USB audio adapter.");
82module_param_array(enable, bool, NULL, 0444);
83MODULE_PARM_DESC(enable, "Enable USB audio adapter.");
84module_param_array(vid, int, NULL, 0444);
85MODULE_PARM_DESC(vid, "Vendor ID for the USB audio device.");
86module_param_array(pid, int, NULL, 0444);
87MODULE_PARM_DESC(pid, "Product ID for the USB audio device.");
88module_param_array(device_setup, int, NULL, 0444);
89MODULE_PARM_DESC(device_setup, "Specific device setup (if needed).");
90module_param(ignore_ctl_error, bool, 0444);
91MODULE_PARM_DESC(ignore_ctl_error,
92 "Ignore errors from USB controller for mixer interfaces.");
93module_param(autoclock, bool, 0444);
94MODULE_PARM_DESC(autoclock, "Enable auto-clock selection for UAC2 devices (default: yes).");
95module_param_array(quirk_alias, charp, NULL, 0444);
96MODULE_PARM_DESC(quirk_alias, "Quirk aliases, e.g. 0123abcd:5678beef.");
97module_param_named(use_vmalloc, snd_usb_use_vmalloc, bool, 0444);
98MODULE_PARM_DESC(use_vmalloc, "Use vmalloc for PCM intermediate buffers (default: yes).");
99
100
101
102
103
104
105static DEFINE_MUTEX(register_mutex);
106static struct snd_usb_audio *usb_chip[SNDRV_CARDS];
107static struct usb_driver usb_audio_driver;
108
109
110
111
112
113static void snd_usb_stream_disconnect(struct snd_usb_stream *as)
114{
115 int idx;
116 struct snd_usb_substream *subs;
117
118 for (idx = 0; idx < 2; idx++) {
119 subs = &as->substream[idx];
120 if (!subs->num_formats)
121 continue;
122 subs->interface = -1;
123 subs->data_endpoint = NULL;
124 subs->sync_endpoint = NULL;
125 }
126}
127
128static int snd_usb_create_stream(struct snd_usb_audio *chip, int ctrlif, int interface)
129{
130 struct usb_device *dev = chip->dev;
131 struct usb_host_interface *alts;
132 struct usb_interface_descriptor *altsd;
133 struct usb_interface *iface = usb_ifnum_to_if(dev, interface);
134
135 if (!iface) {
136 dev_err(&dev->dev, "%u:%d : does not exist\n",
137 ctrlif, interface);
138 return -EINVAL;
139 }
140
141 alts = &iface->altsetting[0];
142 altsd = get_iface_desc(alts);
143
144
145
146
147
148 if ((chip->usb_id == USB_ID(0x18d1, 0x2d04) ||
149 chip->usb_id == USB_ID(0x18d1, 0x2d05)) &&
150 interface == 0 &&
151 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
152 altsd->bInterfaceSubClass == USB_SUBCLASS_VENDOR_SPEC) {
153 interface = 2;
154 iface = usb_ifnum_to_if(dev, interface);
155 if (!iface)
156 return -EINVAL;
157 alts = &iface->altsetting[0];
158 altsd = get_iface_desc(alts);
159 }
160
161 if (usb_interface_claimed(iface)) {
162 dev_dbg(&dev->dev, "%d:%d: skipping, already claimed\n",
163 ctrlif, interface);
164 return -EINVAL;
165 }
166
167 if ((altsd->bInterfaceClass == USB_CLASS_AUDIO ||
168 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC) &&
169 altsd->bInterfaceSubClass == USB_SUBCLASS_MIDISTREAMING) {
170 int err = __snd_usbmidi_create(chip->card, iface,
171 &chip->midi_list, NULL,
172 chip->usb_id);
173 if (err < 0) {
174 dev_err(&dev->dev,
175 "%u:%d: cannot create sequencer device\n",
176 ctrlif, interface);
177 return -EINVAL;
178 }
179 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L);
180
181 return 0;
182 }
183
184 if ((altsd->bInterfaceClass != USB_CLASS_AUDIO &&
185 altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
186 altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING) {
187 dev_dbg(&dev->dev,
188 "%u:%d: skipping non-supported interface %d\n",
189 ctrlif, interface, altsd->bInterfaceClass);
190
191 return -EINVAL;
192 }
193
194 if (snd_usb_get_speed(dev) == USB_SPEED_LOW) {
195 dev_err(&dev->dev, "low speed audio streaming not supported\n");
196 return -EINVAL;
197 }
198
199 if (! snd_usb_parse_audio_interface(chip, interface)) {
200 usb_set_interface(dev, interface, 0);
201 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L);
202 }
203
204 return 0;
205}
206
207
208
209
210static int snd_usb_create_streams(struct snd_usb_audio *chip, int ctrlif)
211{
212 struct usb_device *dev = chip->dev;
213 struct usb_host_interface *host_iface;
214 struct usb_interface_descriptor *altsd;
215 int i, protocol;
216
217
218 host_iface = &usb_ifnum_to_if(dev, ctrlif)->altsetting[0];
219 altsd = get_iface_desc(host_iface);
220 protocol = altsd->bInterfaceProtocol;
221
222 switch (protocol) {
223 default:
224 dev_warn(&dev->dev,
225 "unknown interface protocol %#02x, assuming v1\n",
226 protocol);
227
228
229 case UAC_VERSION_1: {
230 struct uac1_ac_header_descriptor *h1;
231 int rest_bytes;
232
233 h1 = snd_usb_find_csint_desc(host_iface->extra,
234 host_iface->extralen,
235 NULL, UAC_HEADER);
236 if (!h1 || h1->bLength < sizeof(*h1)) {
237 dev_err(&dev->dev, "cannot find UAC_HEADER\n");
238 return -EINVAL;
239 }
240
241 rest_bytes = (void *)(host_iface->extra +
242 host_iface->extralen) - (void *)h1;
243
244
245 if (rest_bytes <= 0) {
246 dev_err(&dev->dev, "invalid control header\n");
247 return -EINVAL;
248 }
249
250 if (rest_bytes < sizeof(*h1)) {
251 dev_err(&dev->dev, "too short v1 buffer descriptor\n");
252 return -EINVAL;
253 }
254
255 if (!h1->bInCollection) {
256 dev_info(&dev->dev, "skipping empty audio interface (v1)\n");
257 return -EINVAL;
258 }
259
260 if (rest_bytes < h1->bLength) {
261 dev_err(&dev->dev, "invalid buffer length (v1)\n");
262 return -EINVAL;
263 }
264
265 if (h1->bLength < sizeof(*h1) + h1->bInCollection) {
266 dev_err(&dev->dev, "invalid UAC_HEADER (v1)\n");
267 return -EINVAL;
268 }
269
270 for (i = 0; i < h1->bInCollection; i++)
271 snd_usb_create_stream(chip, ctrlif, h1->baInterfaceNr[i]);
272
273 break;
274 }
275
276 case UAC_VERSION_2:
277 case UAC_VERSION_3: {
278 struct usb_interface_assoc_descriptor *assoc =
279 usb_ifnum_to_if(dev, ctrlif)->intf_assoc;
280
281 if (!assoc) {
282
283
284
285
286
287 struct usb_interface *iface =
288 usb_ifnum_to_if(dev, ctrlif + 1);
289 if (iface &&
290 iface->intf_assoc &&
291 iface->intf_assoc->bFunctionClass == USB_CLASS_AUDIO &&
292 iface->intf_assoc->bFunctionProtocol == UAC_VERSION_2)
293 assoc = iface->intf_assoc;
294 }
295
296 if (!assoc) {
297 dev_err(&dev->dev, "Audio class v2/v3 interfaces need an interface association\n");
298 return -EINVAL;
299 }
300
301 if (protocol == UAC_VERSION_3) {
302 int badd = assoc->bFunctionSubClass;
303
304 if (badd != UAC3_FUNCTION_SUBCLASS_FULL_ADC_3_0 &&
305 (badd < UAC3_FUNCTION_SUBCLASS_GENERIC_IO ||
306 badd > UAC3_FUNCTION_SUBCLASS_SPEAKERPHONE)) {
307 dev_err(&dev->dev,
308 "Unsupported UAC3 BADD profile\n");
309 return -EINVAL;
310 }
311
312 chip->badd_profile = badd;
313 }
314
315 for (i = 0; i < assoc->bInterfaceCount; i++) {
316 int intf = assoc->bFirstInterface + i;
317
318 if (intf != ctrlif)
319 snd_usb_create_stream(chip, ctrlif, intf);
320 }
321
322 break;
323 }
324 }
325
326 return 0;
327}
328
329
330
331
332
333
334
335
336static void snd_usb_audio_free(struct snd_card *card)
337{
338 struct snd_usb_audio *chip = card->private_data;
339 struct snd_usb_endpoint *ep, *n;
340
341 list_for_each_entry_safe(ep, n, &chip->ep_list, list)
342 snd_usb_endpoint_free(ep);
343
344 mutex_destroy(&chip->mutex);
345 if (!atomic_read(&chip->shutdown))
346 dev_set_drvdata(&chip->dev->dev, NULL);
347}
348
349static void usb_audio_make_shortname(struct usb_device *dev,
350 struct snd_usb_audio *chip,
351 const struct snd_usb_audio_quirk *quirk)
352{
353 struct snd_card *card = chip->card;
354
355 if (quirk && quirk->product_name && *quirk->product_name) {
356 strlcpy(card->shortname, quirk->product_name,
357 sizeof(card->shortname));
358 return;
359 }
360
361
362 if (!dev->descriptor.iProduct ||
363 usb_string(dev, dev->descriptor.iProduct,
364 card->shortname, sizeof(card->shortname)) <= 0) {
365
366 sprintf(card->shortname, "USB Device %#04x:%#04x",
367 USB_ID_VENDOR(chip->usb_id),
368 USB_ID_PRODUCT(chip->usb_id));
369 }
370
371 strim(card->shortname);
372}
373
374static void usb_audio_make_longname(struct usb_device *dev,
375 struct snd_usb_audio *chip,
376 const struct snd_usb_audio_quirk *quirk)
377{
378 struct snd_card *card = chip->card;
379 int len;
380
381
382 if (quirk && quirk->profile_name && *quirk->profile_name) {
383 strlcpy(card->longname, quirk->profile_name,
384 sizeof(card->longname));
385 return;
386 }
387
388 if (quirk && quirk->vendor_name && *quirk->vendor_name) {
389 len = strlcpy(card->longname, quirk->vendor_name, sizeof(card->longname));
390 } else {
391
392 if (dev->descriptor.iManufacturer)
393 len = usb_string(dev, dev->descriptor.iManufacturer,
394 card->longname, sizeof(card->longname));
395 else
396 len = 0;
397
398 }
399 if (len > 0) {
400 strim(card->longname);
401 if (*card->longname)
402 strlcat(card->longname, " ", sizeof(card->longname));
403 }
404
405 strlcat(card->longname, card->shortname, sizeof(card->longname));
406
407 len = strlcat(card->longname, " at ", sizeof(card->longname));
408
409 if (len < sizeof(card->longname))
410 usb_make_path(dev, card->longname + len, sizeof(card->longname) - len);
411
412 switch (snd_usb_get_speed(dev)) {
413 case USB_SPEED_LOW:
414 strlcat(card->longname, ", low speed", sizeof(card->longname));
415 break;
416 case USB_SPEED_FULL:
417 strlcat(card->longname, ", full speed", sizeof(card->longname));
418 break;
419 case USB_SPEED_HIGH:
420 strlcat(card->longname, ", high speed", sizeof(card->longname));
421 break;
422 case USB_SPEED_SUPER:
423 strlcat(card->longname, ", super speed", sizeof(card->longname));
424 break;
425 case USB_SPEED_SUPER_PLUS:
426 strlcat(card->longname, ", super speed plus", sizeof(card->longname));
427 break;
428 default:
429 break;
430 }
431}
432
433
434
435
436static int snd_usb_audio_create(struct usb_interface *intf,
437 struct usb_device *dev, int idx,
438 const struct snd_usb_audio_quirk *quirk,
439 unsigned int usb_id,
440 struct snd_usb_audio **rchip)
441{
442 struct snd_card *card;
443 struct snd_usb_audio *chip;
444 int err;
445 char component[14];
446
447 *rchip = NULL;
448
449 switch (snd_usb_get_speed(dev)) {
450 case USB_SPEED_LOW:
451 case USB_SPEED_FULL:
452 case USB_SPEED_HIGH:
453 case USB_SPEED_WIRELESS:
454 case USB_SPEED_SUPER:
455 case USB_SPEED_SUPER_PLUS:
456 break;
457 default:
458 dev_err(&dev->dev, "unknown device speed %d\n", snd_usb_get_speed(dev));
459 return -ENXIO;
460 }
461
462 err = snd_card_new(&intf->dev, index[idx], id[idx], THIS_MODULE,
463 sizeof(*chip), &card);
464 if (err < 0) {
465 dev_err(&dev->dev, "cannot create card instance %d\n", idx);
466 return err;
467 }
468
469 chip = card->private_data;
470 mutex_init(&chip->mutex);
471 init_waitqueue_head(&chip->shutdown_wait);
472 chip->index = idx;
473 chip->dev = dev;
474 chip->card = card;
475 chip->setup = device_setup[idx];
476 chip->autoclock = autoclock;
477 atomic_set(&chip->active, 1);
478 atomic_set(&chip->usage_count, 0);
479 atomic_set(&chip->shutdown, 0);
480
481 chip->usb_id = usb_id;
482 INIT_LIST_HEAD(&chip->pcm_list);
483 INIT_LIST_HEAD(&chip->ep_list);
484 INIT_LIST_HEAD(&chip->midi_list);
485 INIT_LIST_HEAD(&chip->mixer_list);
486
487 card->private_free = snd_usb_audio_free;
488
489 strcpy(card->driver, "USB-Audio");
490 sprintf(component, "USB%04x:%04x",
491 USB_ID_VENDOR(chip->usb_id), USB_ID_PRODUCT(chip->usb_id));
492 snd_component_add(card, component);
493
494 usb_audio_make_shortname(dev, chip, quirk);
495 usb_audio_make_longname(dev, chip, quirk);
496
497 snd_usb_audio_create_proc(chip);
498
499 *rchip = chip;
500 return 0;
501}
502
503
504static bool get_alias_id(struct usb_device *dev, unsigned int *id)
505{
506 int i;
507 unsigned int src, dst;
508
509 for (i = 0; i < ARRAY_SIZE(quirk_alias); i++) {
510 if (!quirk_alias[i] ||
511 sscanf(quirk_alias[i], "%x:%x", &src, &dst) != 2 ||
512 src != *id)
513 continue;
514 dev_info(&dev->dev,
515 "device (%04x:%04x): applying quirk alias %04x:%04x\n",
516 USB_ID_VENDOR(*id), USB_ID_PRODUCT(*id),
517 USB_ID_VENDOR(dst), USB_ID_PRODUCT(dst));
518 *id = dst;
519 return true;
520 }
521
522 return false;
523}
524
525static const struct usb_device_id usb_audio_ids[];
526
527
528static const struct snd_usb_audio_quirk *
529get_alias_quirk(struct usb_device *dev, unsigned int id)
530{
531 const struct usb_device_id *p;
532
533 for (p = usb_audio_ids; p->match_flags; p++) {
534
535 if ((p->match_flags & USB_DEVICE_ID_MATCH_DEVICE) ==
536 USB_DEVICE_ID_MATCH_DEVICE &&
537 p->idVendor == USB_ID_VENDOR(id) &&
538 p->idProduct == USB_ID_PRODUCT(id))
539 return (const struct snd_usb_audio_quirk *)p->driver_info;
540 }
541
542 return NULL;
543}
544
545
546
547
548
549
550
551
552
553
554
555static int usb_audio_probe(struct usb_interface *intf,
556 const struct usb_device_id *usb_id)
557{
558 struct usb_device *dev = interface_to_usbdev(intf);
559 const struct snd_usb_audio_quirk *quirk =
560 (const struct snd_usb_audio_quirk *)usb_id->driver_info;
561 struct snd_usb_audio *chip;
562 int i, err;
563 struct usb_host_interface *alts;
564 int ifnum;
565 u32 id;
566
567 alts = &intf->altsetting[0];
568 ifnum = get_iface_desc(alts)->bInterfaceNumber;
569 id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
570 le16_to_cpu(dev->descriptor.idProduct));
571 if (get_alias_id(dev, &id))
572 quirk = get_alias_quirk(dev, id);
573 if (quirk && quirk->ifnum >= 0 && ifnum != quirk->ifnum)
574 return -ENXIO;
575
576 err = snd_usb_apply_boot_quirk(dev, intf, quirk, id);
577 if (err < 0)
578 return err;
579
580
581
582
583
584
585 chip = NULL;
586 mutex_lock(®ister_mutex);
587 for (i = 0; i < SNDRV_CARDS; i++) {
588 if (usb_chip[i] && usb_chip[i]->dev == dev) {
589 if (atomic_read(&usb_chip[i]->shutdown)) {
590 dev_err(&dev->dev, "USB device is in the shutdown state, cannot create a card instance\n");
591 err = -EIO;
592 goto __error;
593 }
594 chip = usb_chip[i];
595 atomic_inc(&chip->active);
596 break;
597 }
598 }
599 if (! chip) {
600
601
602
603 for (i = 0; i < SNDRV_CARDS; i++)
604 if (!usb_chip[i] &&
605 (vid[i] == -1 || vid[i] == USB_ID_VENDOR(id)) &&
606 (pid[i] == -1 || pid[i] == USB_ID_PRODUCT(id))) {
607 if (enable[i]) {
608 err = snd_usb_audio_create(intf, dev, i, quirk,
609 id, &chip);
610 if (err < 0)
611 goto __error;
612 chip->pm_intf = intf;
613 break;
614 } else if (vid[i] != -1 || pid[i] != -1) {
615 dev_info(&dev->dev,
616 "device (%04x:%04x) is disabled\n",
617 USB_ID_VENDOR(id),
618 USB_ID_PRODUCT(id));
619 err = -ENOENT;
620 goto __error;
621 }
622 }
623 if (!chip) {
624 dev_err(&dev->dev, "no available usb audio device\n");
625 err = -ENODEV;
626 goto __error;
627 }
628 }
629 dev_set_drvdata(&dev->dev, chip);
630
631
632
633
634
635
636 if (!chip->ctrl_intf)
637 chip->ctrl_intf = alts;
638
639 chip->txfr_quirk = 0;
640 err = 1;
641 if (quirk && quirk->ifnum != QUIRK_NO_INTERFACE) {
642
643 err = snd_usb_create_quirk(chip, intf, &usb_audio_driver, quirk);
644 if (err < 0)
645 goto __error;
646 }
647
648 if (err > 0) {
649
650 err = snd_usb_create_streams(chip, ifnum);
651 if (err < 0)
652 goto __error;
653 err = snd_usb_create_mixer(chip, ifnum, ignore_ctl_error);
654 if (err < 0)
655 goto __error;
656 }
657
658
659 err = snd_card_register(chip->card);
660 if (err < 0)
661 goto __error;
662
663 if (quirk && quirk->shares_media_device) {
664
665 snd_media_device_create(chip, intf);
666 }
667
668 usb_chip[chip->index] = chip;
669 chip->num_interfaces++;
670 usb_set_intfdata(intf, chip);
671 atomic_dec(&chip->active);
672 mutex_unlock(®ister_mutex);
673 return 0;
674
675 __error:
676 if (chip) {
677
678
679
680 atomic_dec(&chip->active);
681 if (!chip->num_interfaces)
682 snd_card_free(chip->card);
683 }
684 mutex_unlock(®ister_mutex);
685 return err;
686}
687
688
689
690
691
692static void usb_audio_disconnect(struct usb_interface *intf)
693{
694 struct snd_usb_audio *chip = usb_get_intfdata(intf);
695 struct snd_card *card;
696 struct list_head *p;
697
698 if (chip == (void *)-1L)
699 return;
700
701 card = chip->card;
702
703 mutex_lock(®ister_mutex);
704 if (atomic_inc_return(&chip->shutdown) == 1) {
705 struct snd_usb_stream *as;
706 struct snd_usb_endpoint *ep;
707 struct usb_mixer_interface *mixer;
708
709
710
711
712 wait_event(chip->shutdown_wait,
713 !atomic_read(&chip->usage_count));
714 snd_card_disconnect(card);
715
716 list_for_each_entry(as, &chip->pcm_list, list) {
717 snd_usb_stream_disconnect(as);
718 }
719
720 list_for_each_entry(ep, &chip->ep_list, list) {
721 snd_usb_endpoint_release(ep);
722 }
723
724 list_for_each(p, &chip->midi_list) {
725 snd_usbmidi_disconnect(p);
726 }
727
728
729
730
731
732
733 snd_media_device_delete(chip);
734
735
736 list_for_each_entry(mixer, &chip->mixer_list, list) {
737 snd_usb_mixer_disconnect(mixer);
738 }
739 }
740
741 chip->num_interfaces--;
742 if (chip->num_interfaces <= 0) {
743 usb_chip[chip->index] = NULL;
744 mutex_unlock(®ister_mutex);
745 snd_card_free_when_closed(card);
746 } else {
747 mutex_unlock(®ister_mutex);
748 }
749}
750
751
752int snd_usb_lock_shutdown(struct snd_usb_audio *chip)
753{
754 int err;
755
756 atomic_inc(&chip->usage_count);
757 if (atomic_read(&chip->shutdown)) {
758 err = -EIO;
759 goto error;
760 }
761 err = snd_usb_autoresume(chip);
762 if (err < 0)
763 goto error;
764 return 0;
765
766 error:
767 if (atomic_dec_and_test(&chip->usage_count))
768 wake_up(&chip->shutdown_wait);
769 return err;
770}
771
772
773void snd_usb_unlock_shutdown(struct snd_usb_audio *chip)
774{
775 snd_usb_autosuspend(chip);
776 if (atomic_dec_and_test(&chip->usage_count))
777 wake_up(&chip->shutdown_wait);
778}
779
780#ifdef CONFIG_PM
781
782int snd_usb_autoresume(struct snd_usb_audio *chip)
783{
784 if (atomic_read(&chip->shutdown))
785 return -EIO;
786 if (atomic_inc_return(&chip->active) == 1)
787 return usb_autopm_get_interface(chip->pm_intf);
788 return 0;
789}
790
791void snd_usb_autosuspend(struct snd_usb_audio *chip)
792{
793 if (atomic_read(&chip->shutdown))
794 return;
795 if (atomic_dec_and_test(&chip->active))
796 usb_autopm_put_interface(chip->pm_intf);
797}
798
799static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message)
800{
801 struct snd_usb_audio *chip = usb_get_intfdata(intf);
802 struct snd_usb_stream *as;
803 struct usb_mixer_interface *mixer;
804 struct list_head *p;
805
806 if (chip == (void *)-1L)
807 return 0;
808
809 chip->autosuspended = !!PMSG_IS_AUTO(message);
810 if (!chip->autosuspended)
811 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot);
812 if (!chip->num_suspended_intf++) {
813 list_for_each_entry(as, &chip->pcm_list, list) {
814 snd_usb_pcm_suspend(as);
815 as->substream[0].need_setup_ep =
816 as->substream[1].need_setup_ep = true;
817 }
818 list_for_each(p, &chip->midi_list)
819 snd_usbmidi_suspend(p);
820 list_for_each_entry(mixer, &chip->mixer_list, list)
821 snd_usb_mixer_suspend(mixer);
822 }
823
824 return 0;
825}
826
827static int __usb_audio_resume(struct usb_interface *intf, bool reset_resume)
828{
829 struct snd_usb_audio *chip = usb_get_intfdata(intf);
830 struct snd_usb_stream *as;
831 struct usb_mixer_interface *mixer;
832 struct list_head *p;
833 int err = 0;
834
835 if (chip == (void *)-1L)
836 return 0;
837 if (--chip->num_suspended_intf)
838 return 0;
839
840 atomic_inc(&chip->active);
841
842 list_for_each_entry(as, &chip->pcm_list, list) {
843 err = snd_usb_pcm_resume(as);
844 if (err < 0)
845 goto err_out;
846 }
847
848
849
850
851
852 list_for_each_entry(mixer, &chip->mixer_list, list) {
853 err = snd_usb_mixer_resume(mixer, reset_resume);
854 if (err < 0)
855 goto err_out;
856 }
857
858 list_for_each(p, &chip->midi_list) {
859 snd_usbmidi_resume(p);
860 }
861
862 if (!chip->autosuspended)
863 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0);
864 chip->autosuspended = 0;
865
866err_out:
867 atomic_dec(&chip->active);
868 return err;
869}
870
871static int usb_audio_resume(struct usb_interface *intf)
872{
873 return __usb_audio_resume(intf, false);
874}
875
876static int usb_audio_reset_resume(struct usb_interface *intf)
877{
878 return __usb_audio_resume(intf, true);
879}
880#else
881#define usb_audio_suspend NULL
882#define usb_audio_resume NULL
883#define usb_audio_reset_resume NULL
884#endif
885
886static const struct usb_device_id usb_audio_ids [] = {
887#include "quirks-table.h"
888 { .match_flags = (USB_DEVICE_ID_MATCH_INT_CLASS | USB_DEVICE_ID_MATCH_INT_SUBCLASS),
889 .bInterfaceClass = USB_CLASS_AUDIO,
890 .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL },
891 { }
892};
893MODULE_DEVICE_TABLE(usb, usb_audio_ids);
894
895
896
897
898
899static struct usb_driver usb_audio_driver = {
900 .name = "snd-usb-audio",
901 .probe = usb_audio_probe,
902 .disconnect = usb_audio_disconnect,
903 .suspend = usb_audio_suspend,
904 .resume = usb_audio_resume,
905 .reset_resume = usb_audio_reset_resume,
906 .id_table = usb_audio_ids,
907 .supports_autosuspend = 1,
908};
909
910module_usb_driver(usb_audio_driver);
911