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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 static char *quirk_alias[SNDRV_CARDS];
 86 
 87 module_param_array(index, int, NULL, 0444);
 88 MODULE_PARM_DESC(index, "Index value for the USB audio adapter.");
 89 module_param_array(id, charp, NULL, 0444);
 90 MODULE_PARM_DESC(id, "ID string for the USB audio adapter.");
 91 module_param_array(enable, bool, NULL, 0444);
 92 MODULE_PARM_DESC(enable, "Enable USB audio adapter.");
 93 module_param_array(vid, int, NULL, 0444);
 94 MODULE_PARM_DESC(vid, "Vendor ID for the USB audio device.");
 95 module_param_array(pid, int, NULL, 0444);
 96 MODULE_PARM_DESC(pid, "Product ID for the USB audio device.");
 97 module_param_array(device_setup, int, NULL, 0444);
 98 MODULE_PARM_DESC(device_setup, "Specific device setup (if needed).");
 99 module_param(ignore_ctl_error, bool, 0444);
100 MODULE_PARM_DESC(ignore_ctl_error,
101                  "Ignore errors from USB controller for mixer interfaces.");
102 module_param(autoclock, bool, 0444);
103 MODULE_PARM_DESC(autoclock, "Enable auto-clock selection for UAC2 devices (default: yes).");
104 module_param_array(quirk_alias, charp, NULL, 0444);
105 MODULE_PARM_DESC(quirk_alias, "Quirk aliases, e.g. 0123abcd:5678beef.");
106 
107 /*
108  * we keep the snd_usb_audio_t instances by ourselves for merging
109  * the all interfaces on the same card as one sound device.
110  */
111 
112 static DEFINE_MUTEX(register_mutex);
113 static struct snd_usb_audio *usb_chip[SNDRV_CARDS];
114 static struct usb_driver usb_audio_driver;
115 
116 /*
117  * disconnect streams
118  * called from usb_audio_disconnect()
119  */
120 static void snd_usb_stream_disconnect(struct snd_usb_stream *as)
121 {
122         int idx;
123         struct snd_usb_substream *subs;
124 
125         for (idx = 0; idx < 2; idx++) {
126                 subs = &as->substream[idx];
127                 if (!subs->num_formats)
128                         continue;
129                 subs->interface = -1;
130                 subs->data_endpoint = NULL;
131                 subs->sync_endpoint = NULL;
132         }
133 }
134 
135 static int snd_usb_create_stream(struct snd_usb_audio *chip, int ctrlif, int interface)
136 {
137         struct usb_device *dev = chip->dev;
138         struct usb_host_interface *alts;
139         struct usb_interface_descriptor *altsd;
140         struct usb_interface *iface = usb_ifnum_to_if(dev, interface);
141 
142         if (!iface) {
143                 dev_err(&dev->dev, "%u:%d : does not exist\n",
144                         ctrlif, interface);
145                 return -EINVAL;
146         }
147 
148         alts = &iface->altsetting[0];
149         altsd = get_iface_desc(alts);
150 
151         /*
152          * Android with both accessory and audio interfaces enabled gets the
153          * interface numbers wrong.
154          */
155         if ((chip->usb_id == USB_ID(0x18d1, 0x2d04) ||
156              chip->usb_id == USB_ID(0x18d1, 0x2d05)) &&
157             interface == 0 &&
158             altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
159             altsd->bInterfaceSubClass == USB_SUBCLASS_VENDOR_SPEC) {
160                 interface = 2;
161                 iface = usb_ifnum_to_if(dev, interface);
162                 if (!iface)
163                         return -EINVAL;
164                 alts = &iface->altsetting[0];
165                 altsd = get_iface_desc(alts);
166         }
167 
168         if (usb_interface_claimed(iface)) {
169                 dev_dbg(&dev->dev, "%d:%d: skipping, already claimed\n",
170                         ctrlif, interface);
171                 return -EINVAL;
172         }
173 
174         if ((altsd->bInterfaceClass == USB_CLASS_AUDIO ||
175              altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC) &&
176             altsd->bInterfaceSubClass == USB_SUBCLASS_MIDISTREAMING) {
177                 int err = __snd_usbmidi_create(chip->card, iface,
178                                              &chip->midi_list, NULL,
179                                              chip->usb_id);
180                 if (err < 0) {
181                         dev_err(&dev->dev,
182                                 "%u:%d: cannot create sequencer device\n",
183                                 ctrlif, interface);
184                         return -EINVAL;
185                 }
186                 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L);
187 
188                 return 0;
189         }
190 
191         if ((altsd->bInterfaceClass != USB_CLASS_AUDIO &&
192              altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
193             altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING) {
194                 dev_dbg(&dev->dev,
195                         "%u:%d: skipping non-supported interface %d\n",
196                         ctrlif, interface, altsd->bInterfaceClass);
197                 /* skip non-supported classes */
198                 return -EINVAL;
199         }
200 
201         if (snd_usb_get_speed(dev) == USB_SPEED_LOW) {
202                 dev_err(&dev->dev, "low speed audio streaming not supported\n");
203                 return -EINVAL;
204         }
205 
206         if (! snd_usb_parse_audio_interface(chip, interface)) {
207                 usb_set_interface(dev, interface, 0); /* reset the current interface */
208                 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L);
209                 return -EINVAL;
210         }
211 
212         return 0;
213 }
214 
215 /*
216  * parse audio control descriptor and create pcm/midi streams
217  */
218 static int snd_usb_create_streams(struct snd_usb_audio *chip, int ctrlif)
219 {
220         struct usb_device *dev = chip->dev;
221         struct usb_host_interface *host_iface;
222         struct usb_interface_descriptor *altsd;
223         void *control_header;
224         int i, protocol;
225 
226         /* find audiocontrol interface */
227         host_iface = &usb_ifnum_to_if(dev, ctrlif)->altsetting[0];
228         control_header = snd_usb_find_csint_desc(host_iface->extra,
229                                                  host_iface->extralen,
230                                                  NULL, UAC_HEADER);
231         altsd = get_iface_desc(host_iface);
232         protocol = altsd->bInterfaceProtocol;
233 
234         if (!control_header) {
235                 dev_err(&dev->dev, "cannot find UAC_HEADER\n");
236                 return -EINVAL;
237         }
238 
239         switch (protocol) {
240         default:
241                 dev_warn(&dev->dev,
242                          "unknown interface protocol %#02x, assuming v1\n",
243                          protocol);
244                 /* fall through */
245 
246         case UAC_VERSION_1: {
247                 struct uac1_ac_header_descriptor *h1 = control_header;
248 
249                 if (!h1->bInCollection) {
250                         dev_info(&dev->dev, "skipping empty audio interface (v1)\n");
251                         return -EINVAL;
252                 }
253 
254                 if (h1->bLength < sizeof(*h1) + h1->bInCollection) {
255                         dev_err(&dev->dev, "invalid UAC_HEADER (v1)\n");
256                         return -EINVAL;
257                 }
258 
259                 for (i = 0; i < h1->bInCollection; i++)
260                         snd_usb_create_stream(chip, ctrlif, h1->baInterfaceNr[i]);
261 
262                 break;
263         }
264 
265         case UAC_VERSION_2: {
266                 struct usb_interface_assoc_descriptor *assoc =
267                         usb_ifnum_to_if(dev, ctrlif)->intf_assoc;
268 
269                 if (!assoc) {
270                         /*
271                          * Firmware writers cannot count to three.  So to find
272                          * the IAD on the NuForce UDH-100, also check the next
273                          * interface.
274                          */
275                         struct usb_interface *iface =
276                                 usb_ifnum_to_if(dev, ctrlif + 1);
277                         if (iface &&
278                             iface->intf_assoc &&
279                             iface->intf_assoc->bFunctionClass == USB_CLASS_AUDIO &&
280                             iface->intf_assoc->bFunctionProtocol == UAC_VERSION_2)
281                                 assoc = iface->intf_assoc;
282                 }
283 
284                 if (!assoc) {
285                         dev_err(&dev->dev, "Audio class v2 interfaces need an interface association\n");
286                         return -EINVAL;
287                 }
288 
289                 for (i = 0; i < assoc->bInterfaceCount; i++) {
290                         int intf = assoc->bFirstInterface + i;
291 
292                         if (intf != ctrlif)
293                                 snd_usb_create_stream(chip, ctrlif, intf);
294                 }
295 
296                 break;
297         }
298         }
299 
300         return 0;
301 }
302 
303 /*
304  * free the chip instance
305  *
306  * here we have to do not much, since pcm and controls are already freed
307  *
308  */
309 
310 static int snd_usb_audio_free(struct snd_usb_audio *chip)
311 {
312         struct snd_usb_endpoint *ep, *n;
313 
314         list_for_each_entry_safe(ep, n, &chip->ep_list, list)
315                 snd_usb_endpoint_free(ep);
316 
317         mutex_destroy(&chip->mutex);
318         dev_set_drvdata(&chip->dev->dev, NULL);
319         kfree(chip);
320         return 0;
321 }
322 
323 static int snd_usb_audio_dev_free(struct snd_device *device)
324 {
325         struct snd_usb_audio *chip = device->device_data;
326         return snd_usb_audio_free(chip);
327 }
328 
329 /*
330  * create a chip instance and set its names.
331  */
332 static int snd_usb_audio_create(struct usb_interface *intf,
333                                 struct usb_device *dev, int idx,
334                                 const struct snd_usb_audio_quirk *quirk,
335                                 struct snd_usb_audio **rchip)
336 {
337         struct snd_card *card;
338         struct snd_usb_audio *chip;
339         int err, len;
340         char component[14];
341         static struct snd_device_ops ops = {
342                 .dev_free =     snd_usb_audio_dev_free,
343         };
344 
345         *rchip = NULL;
346 
347         switch (snd_usb_get_speed(dev)) {
348         case USB_SPEED_LOW:
349         case USB_SPEED_FULL:
350         case USB_SPEED_HIGH:
351         case USB_SPEED_WIRELESS:
352         case USB_SPEED_SUPER:
353                 break;
354         default:
355                 dev_err(&dev->dev, "unknown device speed %d\n", snd_usb_get_speed(dev));
356                 return -ENXIO;
357         }
358 
359         err = snd_card_new(&intf->dev, index[idx], id[idx], THIS_MODULE,
360                            0, &card);
361         if (err < 0) {
362                 dev_err(&dev->dev, "cannot create card instance %d\n", idx);
363                 return err;
364         }
365 
366         chip = kzalloc(sizeof(*chip), GFP_KERNEL);
367         if (! chip) {
368                 snd_card_free(card);
369                 return -ENOMEM;
370         }
371 
372         mutex_init(&chip->mutex);
373         init_waitqueue_head(&chip->shutdown_wait);
374         chip->index = idx;
375         chip->dev = dev;
376         chip->card = card;
377         chip->setup = device_setup[idx];
378         chip->autoclock = autoclock;
379         atomic_set(&chip->active, 1); /* avoid autopm during probing */
380         atomic_set(&chip->usage_count, 0);
381         atomic_set(&chip->shutdown, 0);
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         strim(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                 strim(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 /* look for a matching quirk alias id */
464 static bool get_alias_id(struct usb_device *dev, unsigned int *id)
465 {
466         int i;
467         unsigned int src, dst;
468 
469         for (i = 0; i < ARRAY_SIZE(quirk_alias); i++) {
470                 if (!quirk_alias[i] ||
471                     sscanf(quirk_alias[i], "%x:%x", &src, &dst) != 2 ||
472                     src != *id)
473                         continue;
474                 dev_info(&dev->dev,
475                          "device (%04x:%04x): applying quirk alias %04x:%04x\n",
476                          USB_ID_VENDOR(*id), USB_ID_PRODUCT(*id),
477                          USB_ID_VENDOR(dst), USB_ID_PRODUCT(dst));
478                 *id = dst;
479                 return true;
480         }
481 
482         return false;
483 }
484 
485 static struct usb_device_id usb_audio_ids[]; /* defined below */
486 
487 /* look for the corresponding quirk */
488 static const struct snd_usb_audio_quirk *
489 get_alias_quirk(struct usb_device *dev, unsigned int id)
490 {
491         const struct usb_device_id *p;
492 
493         for (p = usb_audio_ids; p->match_flags; p++) {
494                 /* FIXME: this checks only vendor:product pair in the list */
495                 if ((p->match_flags & USB_DEVICE_ID_MATCH_DEVICE) ==
496                     USB_DEVICE_ID_MATCH_DEVICE &&
497                     p->idVendor == USB_ID_VENDOR(id) &&
498                     p->idProduct == USB_ID_PRODUCT(id))
499                         return (const struct snd_usb_audio_quirk *)p->driver_info;
500         }
501 
502         return NULL;
503 }
504 
505 /*
506  * probe the active usb device
507  *
508  * note that this can be called multiple times per a device, when it
509  * includes multiple audio control interfaces.
510  *
511  * thus we check the usb device pointer and creates the card instance
512  * only at the first time.  the successive calls of this function will
513  * append the pcm interface to the corresponding card.
514  */
515 static int usb_audio_probe(struct usb_interface *intf,
516                            const struct usb_device_id *usb_id)
517 {
518         struct usb_device *dev = interface_to_usbdev(intf);
519         const struct snd_usb_audio_quirk *quirk =
520                 (const struct snd_usb_audio_quirk *)usb_id->driver_info;
521         struct snd_usb_audio *chip;
522         int i, err;
523         struct usb_host_interface *alts;
524         int ifnum;
525         u32 id;
526 
527         alts = &intf->altsetting[0];
528         ifnum = get_iface_desc(alts)->bInterfaceNumber;
529         id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
530                     le16_to_cpu(dev->descriptor.idProduct));
531         if (get_alias_id(dev, &id))
532                 quirk = get_alias_quirk(dev, id);
533         if (quirk && quirk->ifnum >= 0 && ifnum != quirk->ifnum)
534                 return -ENXIO;
535 
536         err = snd_usb_apply_boot_quirk(dev, intf, quirk, id);
537         if (err < 0)
538                 return err;
539 
540         /*
541          * found a config.  now register to ALSA
542          */
543 
544         /* check whether it's already registered */
545         chip = NULL;
546         mutex_lock(&register_mutex);
547         for (i = 0; i < SNDRV_CARDS; i++) {
548                 if (usb_chip[i] && usb_chip[i]->dev == dev) {
549                         if (atomic_read(&usb_chip[i]->shutdown)) {
550                                 dev_err(&dev->dev, "USB device is in the shutdown state, cannot create a card instance\n");
551                                 err = -EIO;
552                                 goto __error;
553                         }
554                         chip = usb_chip[i];
555                         dev_set_drvdata(&dev->dev, chip);
556                         atomic_inc(&chip->active); /* avoid autopm */
557                         break;
558                 }
559         }
560         if (! chip) {
561                 /* it's a fresh one.
562                  * now look for an empty slot and create a new card instance
563                  */
564                 for (i = 0; i < SNDRV_CARDS; i++)
565                         if (enable[i] && ! usb_chip[i] &&
566                             (vid[i] == -1 || vid[i] == USB_ID_VENDOR(id)) &&
567                             (pid[i] == -1 || pid[i] == USB_ID_PRODUCT(id))) {
568                                 err = snd_usb_audio_create(intf, dev, i, quirk,
569                                                            &chip);
570                                 if (err < 0)
571                                         goto __error;
572                                 chip->pm_intf = intf;
573                                 break;
574                         }
575                 if (!chip) {
576                         dev_err(&dev->dev, "no available usb audio device\n");
577                         err = -ENODEV;
578                         goto __error;
579                 }
580         }
581 
582         /*
583          * For devices with more than one control interface, we assume the
584          * first contains the audio controls. We might need a more specific
585          * check here in the future.
586          */
587         if (!chip->ctrl_intf)
588                 chip->ctrl_intf = alts;
589 
590         chip->txfr_quirk = 0;
591         err = 1; /* continue */
592         if (quirk && quirk->ifnum != QUIRK_NO_INTERFACE) {
593                 /* need some special handlings */
594                 err = snd_usb_create_quirk(chip, intf, &usb_audio_driver, quirk);
595                 if (err < 0)
596                         goto __error;
597         }
598 
599         if (err > 0) {
600                 /* create normal USB audio interfaces */
601                 err = snd_usb_create_streams(chip, ifnum);
602                 if (err < 0)
603                         goto __error;
604                 err = snd_usb_create_mixer(chip, ifnum, ignore_ctl_error);
605                 if (err < 0)
606                         goto __error;
607         }
608 
609         /* we are allowed to call snd_card_register() many times */
610         err = snd_card_register(chip->card);
611         if (err < 0)
612                 goto __error;
613 
614         usb_chip[chip->index] = chip;
615         chip->num_interfaces++;
616         usb_set_intfdata(intf, chip);
617         atomic_dec(&chip->active);
618         mutex_unlock(&register_mutex);
619         return 0;
620 
621  __error:
622         if (chip) {
623                 if (!chip->num_interfaces)
624                         snd_card_free(chip->card);
625                 atomic_dec(&chip->active);
626         }
627         mutex_unlock(&register_mutex);
628         return err;
629 }
630 
631 /*
632  * we need to take care of counter, since disconnection can be called also
633  * many times as well as usb_audio_probe().
634  */
635 static void usb_audio_disconnect(struct usb_interface *intf)
636 {
637         struct snd_usb_audio *chip = usb_get_intfdata(intf);
638         struct snd_card *card;
639         struct list_head *p;
640 
641         if (chip == (void *)-1L)
642                 return;
643 
644         card = chip->card;
645 
646         mutex_lock(&register_mutex);
647         if (atomic_inc_return(&chip->shutdown) == 1) {
648                 struct snd_usb_stream *as;
649                 struct snd_usb_endpoint *ep;
650                 struct usb_mixer_interface *mixer;
651 
652                 /* wait until all pending tasks done;
653                  * they are protected by snd_usb_lock_shutdown()
654                  */
655                 wait_event(chip->shutdown_wait,
656                            !atomic_read(&chip->usage_count));
657                 snd_card_disconnect(card);
658                 /* release the pcm resources */
659                 list_for_each_entry(as, &chip->pcm_list, list) {
660                         snd_usb_stream_disconnect(as);
661                 }
662                 /* release the endpoint resources */
663                 list_for_each_entry(ep, &chip->ep_list, list) {
664                         snd_usb_endpoint_release(ep);
665                 }
666                 /* release the midi resources */
667                 list_for_each(p, &chip->midi_list) {
668                         snd_usbmidi_disconnect(p);
669                 }
670                 /* release mixer resources */
671                 list_for_each_entry(mixer, &chip->mixer_list, list) {
672                         snd_usb_mixer_disconnect(mixer);
673                 }
674         }
675 
676         chip->num_interfaces--;
677         if (chip->num_interfaces <= 0) {
678                 usb_chip[chip->index] = NULL;
679                 mutex_unlock(&register_mutex);
680                 snd_card_free_when_closed(card);
681         } else {
682                 mutex_unlock(&register_mutex);
683         }
684 }
685 
686 /* lock the shutdown (disconnect) task and autoresume */
687 int snd_usb_lock_shutdown(struct snd_usb_audio *chip)
688 {
689         int err;
690 
691         atomic_inc(&chip->usage_count);
692         if (atomic_read(&chip->shutdown)) {
693                 err = -EIO;
694                 goto error;
695         }
696         err = snd_usb_autoresume(chip);
697         if (err < 0)
698                 goto error;
699         return 0;
700 
701  error:
702         if (atomic_dec_and_test(&chip->usage_count))
703                 wake_up(&chip->shutdown_wait);
704         return err;
705 }
706 
707 /* autosuspend and unlock the shutdown */
708 void snd_usb_unlock_shutdown(struct snd_usb_audio *chip)
709 {
710         snd_usb_autosuspend(chip);
711         if (atomic_dec_and_test(&chip->usage_count))
712                 wake_up(&chip->shutdown_wait);
713 }
714 
715 #ifdef CONFIG_PM
716 
717 int snd_usb_autoresume(struct snd_usb_audio *chip)
718 {
719         if (atomic_read(&chip->shutdown))
720                 return -EIO;
721         if (atomic_inc_return(&chip->active) == 1)
722                 return usb_autopm_get_interface(chip->pm_intf);
723         return 0;
724 }
725 
726 void snd_usb_autosuspend(struct snd_usb_audio *chip)
727 {
728         if (atomic_read(&chip->shutdown))
729                 return;
730         if (atomic_dec_and_test(&chip->active))
731                 usb_autopm_put_interface(chip->pm_intf);
732 }
733 
734 static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message)
735 {
736         struct snd_usb_audio *chip = usb_get_intfdata(intf);
737         struct snd_usb_stream *as;
738         struct usb_mixer_interface *mixer;
739         struct list_head *p;
740 
741         if (chip == (void *)-1L)
742                 return 0;
743 
744         chip->autosuspended = !!PMSG_IS_AUTO(message);
745         if (!chip->autosuspended)
746                 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot);
747         if (!chip->num_suspended_intf++) {
748                 list_for_each_entry(as, &chip->pcm_list, list) {
749                         snd_pcm_suspend_all(as->pcm);
750                         as->substream[0].need_setup_ep =
751                                 as->substream[1].need_setup_ep = true;
752                 }
753                 list_for_each(p, &chip->midi_list)
754                         snd_usbmidi_suspend(p);
755                 list_for_each_entry(mixer, &chip->mixer_list, list)
756                         snd_usb_mixer_suspend(mixer);
757         }
758 
759         return 0;
760 }
761 
762 static int __usb_audio_resume(struct usb_interface *intf, bool reset_resume)
763 {
764         struct snd_usb_audio *chip = usb_get_intfdata(intf);
765         struct usb_mixer_interface *mixer;
766         struct list_head *p;
767         int err = 0;
768 
769         if (chip == (void *)-1L)
770                 return 0;
771         if (--chip->num_suspended_intf)
772                 return 0;
773 
774         atomic_inc(&chip->active); /* avoid autopm */
775         /*
776          * ALSA leaves material resumption to user space
777          * we just notify and restart the mixers
778          */
779         list_for_each_entry(mixer, &chip->mixer_list, list) {
780                 err = snd_usb_mixer_resume(mixer, reset_resume);
781                 if (err < 0)
782                         goto err_out;
783         }
784 
785         list_for_each(p, &chip->midi_list) {
786                 snd_usbmidi_resume(p);
787         }
788 
789         if (!chip->autosuspended)
790                 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0);
791         chip->autosuspended = 0;
792 
793 err_out:
794         atomic_dec(&chip->active); /* allow autopm after this point */
795         return err;
796 }
797 
798 static int usb_audio_resume(struct usb_interface *intf)
799 {
800         return __usb_audio_resume(intf, false);
801 }
802 
803 static int usb_audio_reset_resume(struct usb_interface *intf)
804 {
805         return __usb_audio_resume(intf, true);
806 }
807 #else
808 #define usb_audio_suspend       NULL
809 #define usb_audio_resume        NULL
810 #define usb_audio_reset_resume  NULL
811 #endif          /* CONFIG_PM */
812 
813 static struct usb_device_id usb_audio_ids [] = {
814 #include "quirks-table.h"
815     { .match_flags = (USB_DEVICE_ID_MATCH_INT_CLASS | USB_DEVICE_ID_MATCH_INT_SUBCLASS),
816       .bInterfaceClass = USB_CLASS_AUDIO,
817       .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL },
818     { }                                         /* Terminating entry */
819 };
820 MODULE_DEVICE_TABLE(usb, usb_audio_ids);
821 
822 /*
823  * entry point for linux usb interface
824  */
825 
826 static struct usb_driver usb_audio_driver = {
827         .name =         "snd-usb-audio",
828         .probe =        usb_audio_probe,
829         .disconnect =   usb_audio_disconnect,
830         .suspend =      usb_audio_suspend,
831         .resume =       usb_audio_resume,
832         .reset_resume = usb_audio_reset_resume,
833         .id_table =     usb_audio_ids,
834         .supports_autosuspend = 1,
835 };
836 
837 module_usb_driver(usb_audio_driver);
838 

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