Version:  2.0.40 2.2.26 2.4.37 2.6.39 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15

Linux/sound/usb/card.c

  1 /*
  2  *   (Tentative) USB Audio Driver for ALSA
  3  *
  4  *   Copyright (c) 2002 by Takashi Iwai <tiwai@suse.de>
  5  *
  6  *   Many codes borrowed from audio.c by
  7  *          Alan Cox (alan@lxorguk.ukuu.org.uk)
  8  *          Thomas Sailer (sailer@ife.ee.ethz.ch)
  9  *
 10  *
 11  *   This program is free software; you can redistribute it and/or modify
 12  *   it under the terms of the GNU General Public License as published by
 13  *   the Free Software Foundation; either version 2 of the License, or
 14  *   (at your option) any later version.
 15  *
 16  *   This program is distributed in the hope that it will be useful,
 17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 19  *   GNU General Public License for more details.
 20  *
 21  *   You should have received a copy of the GNU General Public License
 22  *   along with this program; if not, write to the Free Software
 23  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 24  *
 25  *
 26  *  NOTES:
 27  *
 28  *   - the linked URBs would be preferred but not used so far because of
 29  *     the instability of unlinking.
 30  *   - type II is not supported properly.  there is no device which supports
 31  *     this type *correctly*.  SB extigy looks as if it supports, but it's
 32  *     indeed an AC3 stream packed in SPDIF frames (i.e. no real AC3 stream).
 33  */
 34 
 35 
 36 #include <linux/bitops.h>
 37 #include <linux/init.h>
 38 #include <linux/list.h>
 39 #include <linux/slab.h>
 40 #include <linux/string.h>
 41 #include <linux/ctype.h>
 42 #include <linux/usb.h>
 43 #include <linux/moduleparam.h>
 44 #include <linux/mutex.h>
 45 #include <linux/usb/audio.h>
 46 #include <linux/usb/audio-v2.h>
 47 #include <linux/module.h>
 48 
 49 #include <sound/control.h>
 50 #include <sound/core.h>
 51 #include <sound/info.h>
 52 #include <sound/pcm.h>
 53 #include <sound/pcm_params.h>
 54 #include <sound/initval.h>
 55 
 56 #include "usbaudio.h"
 57 #include "card.h"
 58 #include "midi.h"
 59 #include "mixer.h"
 60 #include "proc.h"
 61 #include "quirks.h"
 62 #include "endpoint.h"
 63 #include "helper.h"
 64 #include "debug.h"
 65 #include "pcm.h"
 66 #include "format.h"
 67 #include "power.h"
 68 #include "stream.h"
 69 
 70 MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
 71 MODULE_DESCRIPTION("USB Audio");
 72 MODULE_LICENSE("GPL");
 73 MODULE_SUPPORTED_DEVICE("{{Generic,USB Audio}}");
 74 
 75 
 76 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;      /* Index 0-MAX */
 77 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;       /* ID for this card */
 78 static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;/* Enable this card */
 79 /* Vendor/product IDs for this card */
 80 static int vid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 };
 81 static int pid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 };
 82 static int device_setup[SNDRV_CARDS]; /* device parameter for this card */
 83 static bool ignore_ctl_error;
 84 static bool autoclock = true;
 85 
 86 module_param_array(index, int, NULL, 0444);
 87 MODULE_PARM_DESC(index, "Index value for the USB audio adapter.");
 88 module_param_array(id, charp, NULL, 0444);
 89 MODULE_PARM_DESC(id, "ID string for the USB audio adapter.");
 90 module_param_array(enable, bool, NULL, 0444);
 91 MODULE_PARM_DESC(enable, "Enable USB audio adapter.");
 92 module_param_array(vid, int, NULL, 0444);
 93 MODULE_PARM_DESC(vid, "Vendor ID for the USB audio device.");
 94 module_param_array(pid, int, NULL, 0444);
 95 MODULE_PARM_DESC(pid, "Product ID for the USB audio device.");
 96 module_param_array(device_setup, int, NULL, 0444);
 97 MODULE_PARM_DESC(device_setup, "Specific device setup (if needed).");
 98 module_param(ignore_ctl_error, bool, 0444);
 99 MODULE_PARM_DESC(ignore_ctl_error,
100                  "Ignore errors from USB controller for mixer interfaces.");
101 module_param(autoclock, bool, 0444);
102 MODULE_PARM_DESC(autoclock, "Enable auto-clock selection for UAC2 devices (default: yes).");
103 
104 /*
105  * we keep the snd_usb_audio_t instances by ourselves for merging
106  * the all interfaces on the same card as one sound device.
107  */
108 
109 static DEFINE_MUTEX(register_mutex);
110 static struct snd_usb_audio *usb_chip[SNDRV_CARDS];
111 static struct usb_driver usb_audio_driver;
112 
113 /*
114  * disconnect streams
115  * called from snd_usb_audio_disconnect()
116  */
117 static void snd_usb_stream_disconnect(struct list_head *head)
118 {
119         int idx;
120         struct snd_usb_stream *as;
121         struct snd_usb_substream *subs;
122 
123         as = list_entry(head, struct snd_usb_stream, list);
124         for (idx = 0; idx < 2; idx++) {
125                 subs = &as->substream[idx];
126                 if (!subs->num_formats)
127                         continue;
128                 subs->interface = -1;
129                 subs->data_endpoint = NULL;
130                 subs->sync_endpoint = NULL;
131         }
132 }
133 
134 static int snd_usb_create_stream(struct snd_usb_audio *chip, int ctrlif, int interface)
135 {
136         struct usb_device *dev = chip->dev;
137         struct usb_host_interface *alts;
138         struct usb_interface_descriptor *altsd;
139         struct usb_interface *iface = usb_ifnum_to_if(dev, interface);
140 
141         if (!iface) {
142                 dev_err(&dev->dev, "%u:%d : does not exist\n",
143                         ctrlif, interface);
144                 return -EINVAL;
145         }
146 
147         alts = &iface->altsetting[0];
148         altsd = get_iface_desc(alts);
149 
150         /*
151          * Android with both accessory and audio interfaces enabled gets the
152          * interface numbers wrong.
153          */
154         if ((chip->usb_id == USB_ID(0x18d1, 0x2d04) ||
155              chip->usb_id == USB_ID(0x18d1, 0x2d05)) &&
156             interface == 0 &&
157             altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
158             altsd->bInterfaceSubClass == USB_SUBCLASS_VENDOR_SPEC) {
159                 interface = 2;
160                 iface = usb_ifnum_to_if(dev, interface);
161                 if (!iface)
162                         return -EINVAL;
163                 alts = &iface->altsetting[0];
164                 altsd = get_iface_desc(alts);
165         }
166 
167         if (usb_interface_claimed(iface)) {
168                 dev_dbg(&dev->dev, "%d:%d: skipping, already claimed\n",
169                         ctrlif, interface);
170                 return -EINVAL;
171         }
172 
173         if ((altsd->bInterfaceClass == USB_CLASS_AUDIO ||
174              altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC) &&
175             altsd->bInterfaceSubClass == USB_SUBCLASS_MIDISTREAMING) {
176                 int err = snd_usbmidi_create(chip->card, iface,
177                                              &chip->midi_list, NULL);
178                 if (err < 0) {
179                         dev_err(&dev->dev,
180                                 "%u:%d: cannot create sequencer device\n",
181                                 ctrlif, interface);
182                         return -EINVAL;
183                 }
184                 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L);
185 
186                 return 0;
187         }
188 
189         if ((altsd->bInterfaceClass != USB_CLASS_AUDIO &&
190              altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
191             altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING) {
192                 dev_dbg(&dev->dev,
193                         "%u:%d: skipping non-supported interface %d\n",
194                         ctrlif, interface, altsd->bInterfaceClass);
195                 /* skip non-supported classes */
196                 return -EINVAL;
197         }
198 
199         if (snd_usb_get_speed(dev) == USB_SPEED_LOW) {
200                 dev_err(&dev->dev, "low speed audio streaming not supported\n");
201                 return -EINVAL;
202         }
203 
204         if (! snd_usb_parse_audio_interface(chip, interface)) {
205                 usb_set_interface(dev, interface, 0); /* reset the current interface */
206                 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L);
207                 return -EINVAL;
208         }
209 
210         return 0;
211 }
212 
213 /*
214  * parse audio control descriptor and create pcm/midi streams
215  */
216 static int snd_usb_create_streams(struct snd_usb_audio *chip, int ctrlif)
217 {
218         struct usb_device *dev = chip->dev;
219         struct usb_host_interface *host_iface;
220         struct usb_interface_descriptor *altsd;
221         void *control_header;
222         int i, protocol;
223 
224         /* find audiocontrol interface */
225         host_iface = &usb_ifnum_to_if(dev, ctrlif)->altsetting[0];
226         control_header = snd_usb_find_csint_desc(host_iface->extra,
227                                                  host_iface->extralen,
228                                                  NULL, UAC_HEADER);
229         altsd = get_iface_desc(host_iface);
230         protocol = altsd->bInterfaceProtocol;
231 
232         if (!control_header) {
233                 dev_err(&dev->dev, "cannot find UAC_HEADER\n");
234                 return -EINVAL;
235         }
236 
237         switch (protocol) {
238         default:
239                 dev_warn(&dev->dev,
240                          "unknown interface protocol %#02x, assuming v1\n",
241                          protocol);
242                 /* fall through */
243 
244         case UAC_VERSION_1: {
245                 struct uac1_ac_header_descriptor *h1 = control_header;
246 
247                 if (!h1->bInCollection) {
248                         dev_info(&dev->dev, "skipping empty audio interface (v1)\n");
249                         return -EINVAL;
250                 }
251 
252                 if (h1->bLength < sizeof(*h1) + h1->bInCollection) {
253                         dev_err(&dev->dev, "invalid UAC_HEADER (v1)\n");
254                         return -EINVAL;
255                 }
256 
257                 for (i = 0; i < h1->bInCollection; i++)
258                         snd_usb_create_stream(chip, ctrlif, h1->baInterfaceNr[i]);
259 
260                 break;
261         }
262 
263         case UAC_VERSION_2: {
264                 struct usb_interface_assoc_descriptor *assoc =
265                         usb_ifnum_to_if(dev, ctrlif)->intf_assoc;
266 
267                 if (!assoc) {
268                         /*
269                          * Firmware writers cannot count to three.  So to find
270                          * the IAD on the NuForce UDH-100, also check the next
271                          * interface.
272                          */
273                         struct usb_interface *iface =
274                                 usb_ifnum_to_if(dev, ctrlif + 1);
275                         if (iface &&
276                             iface->intf_assoc &&
277                             iface->intf_assoc->bFunctionClass == USB_CLASS_AUDIO &&
278                             iface->intf_assoc->bFunctionProtocol == UAC_VERSION_2)
279                                 assoc = iface->intf_assoc;
280                 }
281 
282                 if (!assoc) {
283                         dev_err(&dev->dev, "Audio class v2 interfaces need an interface association\n");
284                         return -EINVAL;
285                 }
286 
287                 for (i = 0; i < assoc->bInterfaceCount; i++) {
288                         int intf = assoc->bFirstInterface + i;
289 
290                         if (intf != ctrlif)
291                                 snd_usb_create_stream(chip, ctrlif, intf);
292                 }
293 
294                 break;
295         }
296         }
297 
298         return 0;
299 }
300 
301 /*
302  * free the chip instance
303  *
304  * here we have to do not much, since pcm and controls are already freed
305  *
306  */
307 
308 static int snd_usb_audio_free(struct snd_usb_audio *chip)
309 {
310         mutex_destroy(&chip->mutex);
311         kfree(chip);
312         return 0;
313 }
314 
315 static int snd_usb_audio_dev_free(struct snd_device *device)
316 {
317         struct snd_usb_audio *chip = device->device_data;
318         return snd_usb_audio_free(chip);
319 }
320 
321 static void remove_trailing_spaces(char *str)
322 {
323         char *p;
324 
325         if (!*str)
326                 return;
327         for (p = str + strlen(str) - 1; p >= str && isspace(*p); p--)
328                 *p = 0;
329 }
330 
331 /*
332  * create a chip instance and set its names.
333  */
334 static int snd_usb_audio_create(struct usb_interface *intf,
335                                 struct usb_device *dev, int idx,
336                                 const struct snd_usb_audio_quirk *quirk,
337                                 struct snd_usb_audio **rchip)
338 {
339         struct snd_card *card;
340         struct snd_usb_audio *chip;
341         int err, len;
342         char component[14];
343         static struct snd_device_ops ops = {
344                 .dev_free =     snd_usb_audio_dev_free,
345         };
346 
347         *rchip = NULL;
348 
349         switch (snd_usb_get_speed(dev)) {
350         case USB_SPEED_LOW:
351         case USB_SPEED_FULL:
352         case USB_SPEED_HIGH:
353         case USB_SPEED_WIRELESS:
354         case USB_SPEED_SUPER:
355                 break;
356         default:
357                 dev_err(&dev->dev, "unknown device speed %d\n", snd_usb_get_speed(dev));
358                 return -ENXIO;
359         }
360 
361         err = snd_card_new(&intf->dev, index[idx], id[idx], THIS_MODULE,
362                            0, &card);
363         if (err < 0) {
364                 dev_err(&dev->dev, "cannot create card instance %d\n", idx);
365                 return err;
366         }
367 
368         chip = kzalloc(sizeof(*chip), GFP_KERNEL);
369         if (! chip) {
370                 snd_card_free(card);
371                 return -ENOMEM;
372         }
373 
374         mutex_init(&chip->mutex);
375         init_rwsem(&chip->shutdown_rwsem);
376         chip->index = idx;
377         chip->dev = dev;
378         chip->card = card;
379         chip->setup = device_setup[idx];
380         chip->autoclock = autoclock;
381         chip->probing = 1;
382 
383         chip->usb_id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
384                               le16_to_cpu(dev->descriptor.idProduct));
385         INIT_LIST_HEAD(&chip->pcm_list);
386         INIT_LIST_HEAD(&chip->ep_list);
387         INIT_LIST_HEAD(&chip->midi_list);
388         INIT_LIST_HEAD(&chip->mixer_list);
389 
390         if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) {
391                 snd_usb_audio_free(chip);
392                 snd_card_free(card);
393                 return err;
394         }
395 
396         strcpy(card->driver, "USB-Audio");
397         sprintf(component, "USB%04x:%04x",
398                 USB_ID_VENDOR(chip->usb_id), USB_ID_PRODUCT(chip->usb_id));
399         snd_component_add(card, component);
400 
401         /* retrieve the device string as shortname */
402         if (quirk && quirk->product_name && *quirk->product_name) {
403                 strlcpy(card->shortname, quirk->product_name, sizeof(card->shortname));
404         } else {
405                 if (!dev->descriptor.iProduct ||
406                     usb_string(dev, dev->descriptor.iProduct,
407                     card->shortname, sizeof(card->shortname)) <= 0) {
408                         /* no name available from anywhere, so use ID */
409                         sprintf(card->shortname, "USB Device %#04x:%#04x",
410                                 USB_ID_VENDOR(chip->usb_id),
411                                 USB_ID_PRODUCT(chip->usb_id));
412                 }
413         }
414         remove_trailing_spaces(card->shortname);
415 
416         /* retrieve the vendor and device strings as longname */
417         if (quirk && quirk->vendor_name && *quirk->vendor_name) {
418                 len = strlcpy(card->longname, quirk->vendor_name, sizeof(card->longname));
419         } else {
420                 if (dev->descriptor.iManufacturer)
421                         len = usb_string(dev, dev->descriptor.iManufacturer,
422                                          card->longname, sizeof(card->longname));
423                 else
424                         len = 0;
425                 /* we don't really care if there isn't any vendor string */
426         }
427         if (len > 0) {
428                 remove_trailing_spaces(card->longname);
429                 if (*card->longname)
430                         strlcat(card->longname, " ", sizeof(card->longname));
431         }
432 
433         strlcat(card->longname, card->shortname, sizeof(card->longname));
434 
435         len = strlcat(card->longname, " at ", sizeof(card->longname));
436 
437         if (len < sizeof(card->longname))
438                 usb_make_path(dev, card->longname + len, sizeof(card->longname) - len);
439 
440         switch (snd_usb_get_speed(dev)) {
441         case USB_SPEED_LOW:
442                 strlcat(card->longname, ", low speed", sizeof(card->longname));
443                 break;
444         case USB_SPEED_FULL:
445                 strlcat(card->longname, ", full speed", sizeof(card->longname));
446                 break;
447         case USB_SPEED_HIGH:
448                 strlcat(card->longname, ", high speed", sizeof(card->longname));
449                 break;
450         case USB_SPEED_SUPER:
451                 strlcat(card->longname, ", super speed", sizeof(card->longname));
452                 break;
453         default:
454                 break;
455         }
456 
457         snd_usb_audio_create_proc(chip);
458 
459         *rchip = chip;
460         return 0;
461 }
462 
463 /*
464  * probe the active usb device
465  *
466  * note that this can be called multiple times per a device, when it
467  * includes multiple audio control interfaces.
468  *
469  * thus we check the usb device pointer and creates the card instance
470  * only at the first time.  the successive calls of this function will
471  * append the pcm interface to the corresponding card.
472  */
473 static struct snd_usb_audio *
474 snd_usb_audio_probe(struct usb_device *dev,
475                     struct usb_interface *intf,
476                     const struct usb_device_id *usb_id)
477 {
478         const struct snd_usb_audio_quirk *quirk = (const struct snd_usb_audio_quirk *)usb_id->driver_info;
479         int i, err;
480         struct snd_usb_audio *chip;
481         struct usb_host_interface *alts;
482         int ifnum;
483         u32 id;
484 
485         alts = &intf->altsetting[0];
486         ifnum = get_iface_desc(alts)->bInterfaceNumber;
487         id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
488                     le16_to_cpu(dev->descriptor.idProduct));
489         if (quirk && quirk->ifnum >= 0 && ifnum != quirk->ifnum)
490                 goto __err_val;
491 
492         if (snd_usb_apply_boot_quirk(dev, intf, quirk) < 0)
493                 goto __err_val;
494 
495         /*
496          * found a config.  now register to ALSA
497          */
498 
499         /* check whether it's already registered */
500         chip = NULL;
501         mutex_lock(&register_mutex);
502         for (i = 0; i < SNDRV_CARDS; i++) {
503                 if (usb_chip[i] && usb_chip[i]->dev == dev) {
504                         if (usb_chip[i]->shutdown) {
505                                 dev_err(&dev->dev, "USB device is in the shutdown state, cannot create a card instance\n");
506                                 goto __error;
507                         }
508                         chip = usb_chip[i];
509                         chip->probing = 1;
510                         break;
511                 }
512         }
513         if (! chip) {
514                 /* it's a fresh one.
515                  * now look for an empty slot and create a new card instance
516                  */
517                 for (i = 0; i < SNDRV_CARDS; i++)
518                         if (enable[i] && ! usb_chip[i] &&
519                             (vid[i] == -1 || vid[i] == USB_ID_VENDOR(id)) &&
520                             (pid[i] == -1 || pid[i] == USB_ID_PRODUCT(id))) {
521                                 if (snd_usb_audio_create(intf, dev, i, quirk,
522                                                          &chip) < 0) {
523                                         goto __error;
524                                 }
525                                 chip->pm_intf = intf;
526                                 break;
527                         }
528                 if (!chip) {
529                         dev_err(&dev->dev, "no available usb audio device\n");
530                         goto __error;
531                 }
532         }
533 
534         /*
535          * For devices with more than one control interface, we assume the
536          * first contains the audio controls. We might need a more specific
537          * check here in the future.
538          */
539         if (!chip->ctrl_intf)
540                 chip->ctrl_intf = alts;
541 
542         chip->txfr_quirk = 0;
543         err = 1; /* continue */
544         if (quirk && quirk->ifnum != QUIRK_NO_INTERFACE) {
545                 /* need some special handlings */
546                 if ((err = snd_usb_create_quirk(chip, intf, &usb_audio_driver, quirk)) < 0)
547                         goto __error;
548         }
549 
550         if (err > 0) {
551                 /* create normal USB audio interfaces */
552                 if (snd_usb_create_streams(chip, ifnum) < 0 ||
553                     snd_usb_create_mixer(chip, ifnum, ignore_ctl_error) < 0) {
554                         goto __error;
555                 }
556         }
557 
558         /* we are allowed to call snd_card_register() many times */
559         if (snd_card_register(chip->card) < 0) {
560                 goto __error;
561         }
562 
563         usb_chip[chip->index] = chip;
564         chip->num_interfaces++;
565         chip->probing = 0;
566         mutex_unlock(&register_mutex);
567         return chip;
568 
569  __error:
570         if (chip) {
571                 if (!chip->num_interfaces)
572                         snd_card_free(chip->card);
573                 chip->probing = 0;
574         }
575         mutex_unlock(&register_mutex);
576  __err_val:
577         return NULL;
578 }
579 
580 /*
581  * we need to take care of counter, since disconnection can be called also
582  * many times as well as usb_audio_probe().
583  */
584 static void snd_usb_audio_disconnect(struct usb_device *dev,
585                                      struct snd_usb_audio *chip)
586 {
587         struct snd_card *card;
588         struct list_head *p, *n;
589 
590         if (chip == (void *)-1L)
591                 return;
592 
593         card = chip->card;
594         down_write(&chip->shutdown_rwsem);
595         chip->shutdown = 1;
596         up_write(&chip->shutdown_rwsem);
597 
598         mutex_lock(&register_mutex);
599         chip->num_interfaces--;
600         if (chip->num_interfaces <= 0) {
601                 snd_card_disconnect(card);
602                 /* release the pcm resources */
603                 list_for_each(p, &chip->pcm_list) {
604                         snd_usb_stream_disconnect(p);
605                 }
606                 /* release the endpoint resources */
607                 list_for_each_safe(p, n, &chip->ep_list) {
608                         snd_usb_endpoint_free(p);
609                 }
610                 /* release the midi resources */
611                 list_for_each(p, &chip->midi_list) {
612                         snd_usbmidi_disconnect(p);
613                 }
614                 /* release mixer resources */
615                 list_for_each(p, &chip->mixer_list) {
616                         snd_usb_mixer_disconnect(p);
617                 }
618                 usb_chip[chip->index] = NULL;
619                 mutex_unlock(&register_mutex);
620                 snd_card_free_when_closed(card);
621         } else {
622                 mutex_unlock(&register_mutex);
623         }
624 }
625 
626 /*
627  * new 2.5 USB kernel API
628  */
629 static int usb_audio_probe(struct usb_interface *intf,
630                            const struct usb_device_id *id)
631 {
632         struct snd_usb_audio *chip;
633         chip = snd_usb_audio_probe(interface_to_usbdev(intf), intf, id);
634         if (chip) {
635                 usb_set_intfdata(intf, chip);
636                 return 0;
637         } else
638                 return -EIO;
639 }
640 
641 static void usb_audio_disconnect(struct usb_interface *intf)
642 {
643         snd_usb_audio_disconnect(interface_to_usbdev(intf),
644                                  usb_get_intfdata(intf));
645 }
646 
647 #ifdef CONFIG_PM
648 
649 int snd_usb_autoresume(struct snd_usb_audio *chip)
650 {
651         int err = -ENODEV;
652 
653         down_read(&chip->shutdown_rwsem);
654         if (chip->probing && chip->in_pm)
655                 err = 0;
656         else if (!chip->shutdown)
657                 err = usb_autopm_get_interface(chip->pm_intf);
658         up_read(&chip->shutdown_rwsem);
659 
660         return err;
661 }
662 
663 void snd_usb_autosuspend(struct snd_usb_audio *chip)
664 {
665         down_read(&chip->shutdown_rwsem);
666         if (!chip->shutdown && !chip->probing && !chip->in_pm)
667                 usb_autopm_put_interface(chip->pm_intf);
668         up_read(&chip->shutdown_rwsem);
669 }
670 
671 static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message)
672 {
673         struct snd_usb_audio *chip = usb_get_intfdata(intf);
674         struct snd_usb_stream *as;
675         struct usb_mixer_interface *mixer;
676 
677         if (chip == (void *)-1L)
678                 return 0;
679 
680         if (!PMSG_IS_AUTO(message)) {
681                 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot);
682                 if (!chip->num_suspended_intf++) {
683                         list_for_each_entry(as, &chip->pcm_list, list) {
684                                 snd_pcm_suspend_all(as->pcm);
685                                 as->substream[0].need_setup_ep =
686                                         as->substream[1].need_setup_ep = true;
687                         }
688                 }
689         } else {
690                 /*
691                  * otherwise we keep the rest of the system in the dark
692                  * to keep this transparent
693                  */
694                 if (!chip->num_suspended_intf++)
695                         chip->autosuspended = 1;
696         }
697 
698         if (chip->num_suspended_intf == 1)
699                 list_for_each_entry(mixer, &chip->mixer_list, list)
700                         snd_usb_mixer_suspend(mixer);
701 
702         return 0;
703 }
704 
705 static int __usb_audio_resume(struct usb_interface *intf, bool reset_resume)
706 {
707         struct snd_usb_audio *chip = usb_get_intfdata(intf);
708         struct usb_mixer_interface *mixer;
709         int err = 0;
710 
711         if (chip == (void *)-1L)
712                 return 0;
713         if (--chip->num_suspended_intf)
714                 return 0;
715 
716         chip->in_pm = 1;
717         /*
718          * ALSA leaves material resumption to user space
719          * we just notify and restart the mixers
720          */
721         list_for_each_entry(mixer, &chip->mixer_list, list) {
722                 err = snd_usb_mixer_resume(mixer, reset_resume);
723                 if (err < 0)
724                         goto err_out;
725         }
726 
727         if (!chip->autosuspended)
728                 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0);
729         chip->autosuspended = 0;
730 
731 err_out:
732         chip->in_pm = 0;
733         return err;
734 }
735 
736 static int usb_audio_resume(struct usb_interface *intf)
737 {
738         return __usb_audio_resume(intf, false);
739 }
740 
741 static int usb_audio_reset_resume(struct usb_interface *intf)
742 {
743         return __usb_audio_resume(intf, true);
744 }
745 #else
746 #define usb_audio_suspend       NULL
747 #define usb_audio_resume        NULL
748 #define usb_audio_reset_resume  NULL
749 #endif          /* CONFIG_PM */
750 
751 static struct usb_device_id usb_audio_ids [] = {
752 #include "quirks-table.h"
753     { .match_flags = (USB_DEVICE_ID_MATCH_INT_CLASS | USB_DEVICE_ID_MATCH_INT_SUBCLASS),
754       .bInterfaceClass = USB_CLASS_AUDIO,
755       .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL },
756     { }                                         /* Terminating entry */
757 };
758 MODULE_DEVICE_TABLE(usb, usb_audio_ids);
759 
760 /*
761  * entry point for linux usb interface
762  */
763 
764 static struct usb_driver usb_audio_driver = {
765         .name =         "snd-usb-audio",
766         .probe =        usb_audio_probe,
767         .disconnect =   usb_audio_disconnect,
768         .suspend =      usb_audio_suspend,
769         .resume =       usb_audio_resume,
770         .reset_resume = usb_audio_reset_resume,
771         .id_table =     usb_audio_ids,
772         .supports_autosuspend = 1,
773 };
774 
775 module_usb_driver(usb_audio_driver);
776 

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