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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         case USB_SPEED_SUPER_PLUS:
354                 break;
355         default:
356                 dev_err(&dev->dev, "unknown device speed %d\n", snd_usb_get_speed(dev));
357                 return -ENXIO;
358         }
359 
360         err = snd_card_new(&intf->dev, index[idx], id[idx], THIS_MODULE,
361                            0, &card);
362         if (err < 0) {
363                 dev_err(&dev->dev, "cannot create card instance %d\n", idx);
364                 return err;
365         }
366 
367         chip = kzalloc(sizeof(*chip), GFP_KERNEL);
368         if (! chip) {
369                 snd_card_free(card);
370                 return -ENOMEM;
371         }
372 
373         mutex_init(&chip->mutex);
374         init_waitqueue_head(&chip->shutdown_wait);
375         chip->index = idx;
376         chip->dev = dev;
377         chip->card = card;
378         chip->setup = device_setup[idx];
379         chip->autoclock = autoclock;
380         atomic_set(&chip->active, 1); /* avoid autopm during probing */
381         atomic_set(&chip->usage_count, 0);
382         atomic_set(&chip->shutdown, 0);
383 
384         chip->usb_id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
385                               le16_to_cpu(dev->descriptor.idProduct));
386         INIT_LIST_HEAD(&chip->pcm_list);
387         INIT_LIST_HEAD(&chip->ep_list);
388         INIT_LIST_HEAD(&chip->midi_list);
389         INIT_LIST_HEAD(&chip->mixer_list);
390 
391         if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) {
392                 snd_usb_audio_free(chip);
393                 snd_card_free(card);
394                 return err;
395         }
396 
397         strcpy(card->driver, "USB-Audio");
398         sprintf(component, "USB%04x:%04x",
399                 USB_ID_VENDOR(chip->usb_id), USB_ID_PRODUCT(chip->usb_id));
400         snd_component_add(card, component);
401 
402         /* retrieve the device string as shortname */
403         if (quirk && quirk->product_name && *quirk->product_name) {
404                 strlcpy(card->shortname, quirk->product_name, sizeof(card->shortname));
405         } else {
406                 if (!dev->descriptor.iProduct ||
407                     usb_string(dev, dev->descriptor.iProduct,
408                     card->shortname, sizeof(card->shortname)) <= 0) {
409                         /* no name available from anywhere, so use ID */
410                         sprintf(card->shortname, "USB Device %#04x:%#04x",
411                                 USB_ID_VENDOR(chip->usb_id),
412                                 USB_ID_PRODUCT(chip->usb_id));
413                 }
414         }
415         strim(card->shortname);
416 
417         /* retrieve the vendor and device strings as longname */
418         if (quirk && quirk->vendor_name && *quirk->vendor_name) {
419                 len = strlcpy(card->longname, quirk->vendor_name, sizeof(card->longname));
420         } else {
421                 if (dev->descriptor.iManufacturer)
422                         len = usb_string(dev, dev->descriptor.iManufacturer,
423                                          card->longname, sizeof(card->longname));
424                 else
425                         len = 0;
426                 /* we don't really care if there isn't any vendor string */
427         }
428         if (len > 0) {
429                 strim(card->longname);
430                 if (*card->longname)
431                         strlcat(card->longname, " ", sizeof(card->longname));
432         }
433 
434         strlcat(card->longname, card->shortname, sizeof(card->longname));
435 
436         len = strlcat(card->longname, " at ", sizeof(card->longname));
437 
438         if (len < sizeof(card->longname))
439                 usb_make_path(dev, card->longname + len, sizeof(card->longname) - len);
440 
441         switch (snd_usb_get_speed(dev)) {
442         case USB_SPEED_LOW:
443                 strlcat(card->longname, ", low speed", sizeof(card->longname));
444                 break;
445         case USB_SPEED_FULL:
446                 strlcat(card->longname, ", full speed", sizeof(card->longname));
447                 break;
448         case USB_SPEED_HIGH:
449                 strlcat(card->longname, ", high speed", sizeof(card->longname));
450                 break;
451         case USB_SPEED_SUPER:
452                 strlcat(card->longname, ", super speed", sizeof(card->longname));
453                 break;
454         case USB_SPEED_SUPER_PLUS:
455                 strlcat(card->longname, ", super speed plus", sizeof(card->longname));
456                 break;
457         default:
458                 break;
459         }
460 
461         snd_usb_audio_create_proc(chip);
462 
463         *rchip = chip;
464         return 0;
465 }
466 
467 /* look for a matching quirk alias id */
468 static bool get_alias_id(struct usb_device *dev, unsigned int *id)
469 {
470         int i;
471         unsigned int src, dst;
472 
473         for (i = 0; i < ARRAY_SIZE(quirk_alias); i++) {
474                 if (!quirk_alias[i] ||
475                     sscanf(quirk_alias[i], "%x:%x", &src, &dst) != 2 ||
476                     src != *id)
477                         continue;
478                 dev_info(&dev->dev,
479                          "device (%04x:%04x): applying quirk alias %04x:%04x\n",
480                          USB_ID_VENDOR(*id), USB_ID_PRODUCT(*id),
481                          USB_ID_VENDOR(dst), USB_ID_PRODUCT(dst));
482                 *id = dst;
483                 return true;
484         }
485 
486         return false;
487 }
488 
489 static struct usb_device_id usb_audio_ids[]; /* defined below */
490 
491 /* look for the corresponding quirk */
492 static const struct snd_usb_audio_quirk *
493 get_alias_quirk(struct usb_device *dev, unsigned int id)
494 {
495         const struct usb_device_id *p;
496 
497         for (p = usb_audio_ids; p->match_flags; p++) {
498                 /* FIXME: this checks only vendor:product pair in the list */
499                 if ((p->match_flags & USB_DEVICE_ID_MATCH_DEVICE) ==
500                     USB_DEVICE_ID_MATCH_DEVICE &&
501                     p->idVendor == USB_ID_VENDOR(id) &&
502                     p->idProduct == USB_ID_PRODUCT(id))
503                         return (const struct snd_usb_audio_quirk *)p->driver_info;
504         }
505 
506         return NULL;
507 }
508 
509 /*
510  * probe the active usb device
511  *
512  * note that this can be called multiple times per a device, when it
513  * includes multiple audio control interfaces.
514  *
515  * thus we check the usb device pointer and creates the card instance
516  * only at the first time.  the successive calls of this function will
517  * append the pcm interface to the corresponding card.
518  */
519 static int usb_audio_probe(struct usb_interface *intf,
520                            const struct usb_device_id *usb_id)
521 {
522         struct usb_device *dev = interface_to_usbdev(intf);
523         const struct snd_usb_audio_quirk *quirk =
524                 (const struct snd_usb_audio_quirk *)usb_id->driver_info;
525         struct snd_usb_audio *chip;
526         int i, err;
527         struct usb_host_interface *alts;
528         int ifnum;
529         u32 id;
530 
531         alts = &intf->altsetting[0];
532         ifnum = get_iface_desc(alts)->bInterfaceNumber;
533         id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
534                     le16_to_cpu(dev->descriptor.idProduct));
535         if (get_alias_id(dev, &id))
536                 quirk = get_alias_quirk(dev, id);
537         if (quirk && quirk->ifnum >= 0 && ifnum != quirk->ifnum)
538                 return -ENXIO;
539 
540         err = snd_usb_apply_boot_quirk(dev, intf, quirk, id);
541         if (err < 0)
542                 return err;
543 
544         /*
545          * found a config.  now register to ALSA
546          */
547 
548         /* check whether it's already registered */
549         chip = NULL;
550         mutex_lock(&register_mutex);
551         for (i = 0; i < SNDRV_CARDS; i++) {
552                 if (usb_chip[i] && usb_chip[i]->dev == dev) {
553                         if (atomic_read(&usb_chip[i]->shutdown)) {
554                                 dev_err(&dev->dev, "USB device is in the shutdown state, cannot create a card instance\n");
555                                 err = -EIO;
556                                 goto __error;
557                         }
558                         chip = usb_chip[i];
559                         atomic_inc(&chip->active); /* avoid autopm */
560                         break;
561                 }
562         }
563         if (! chip) {
564                 /* it's a fresh one.
565                  * now look for an empty slot and create a new card instance
566                  */
567                 for (i = 0; i < SNDRV_CARDS; i++)
568                         if (enable[i] && ! usb_chip[i] &&
569                             (vid[i] == -1 || vid[i] == USB_ID_VENDOR(id)) &&
570                             (pid[i] == -1 || pid[i] == USB_ID_PRODUCT(id))) {
571                                 err = snd_usb_audio_create(intf, dev, i, quirk,
572                                                            &chip);
573                                 if (err < 0)
574                                         goto __error;
575                                 chip->pm_intf = intf;
576                                 break;
577                         }
578                 if (!chip) {
579                         dev_err(&dev->dev, "no available usb audio device\n");
580                         err = -ENODEV;
581                         goto __error;
582                 }
583         }
584         dev_set_drvdata(&dev->dev, chip);
585 
586         /*
587          * For devices with more than one control interface, we assume the
588          * first contains the audio controls. We might need a more specific
589          * check here in the future.
590          */
591         if (!chip->ctrl_intf)
592                 chip->ctrl_intf = alts;
593 
594         chip->txfr_quirk = 0;
595         err = 1; /* continue */
596         if (quirk && quirk->ifnum != QUIRK_NO_INTERFACE) {
597                 /* need some special handlings */
598                 err = snd_usb_create_quirk(chip, intf, &usb_audio_driver, quirk);
599                 if (err < 0)
600                         goto __error;
601         }
602 
603         if (err > 0) {
604                 /* create normal USB audio interfaces */
605                 err = snd_usb_create_streams(chip, ifnum);
606                 if (err < 0)
607                         goto __error;
608                 err = snd_usb_create_mixer(chip, ifnum, ignore_ctl_error);
609                 if (err < 0)
610                         goto __error;
611         }
612 
613         /* we are allowed to call snd_card_register() many times */
614         err = snd_card_register(chip->card);
615         if (err < 0)
616                 goto __error;
617 
618         usb_chip[chip->index] = chip;
619         chip->num_interfaces++;
620         usb_set_intfdata(intf, chip);
621         atomic_dec(&chip->active);
622         mutex_unlock(&register_mutex);
623         return 0;
624 
625  __error:
626         if (chip) {
627                 if (!chip->num_interfaces)
628                         snd_card_free(chip->card);
629                 atomic_dec(&chip->active);
630         }
631         mutex_unlock(&register_mutex);
632         return err;
633 }
634 
635 /*
636  * we need to take care of counter, since disconnection can be called also
637  * many times as well as usb_audio_probe().
638  */
639 static void usb_audio_disconnect(struct usb_interface *intf)
640 {
641         struct snd_usb_audio *chip = usb_get_intfdata(intf);
642         struct snd_card *card;
643         struct list_head *p;
644 
645         if (chip == (void *)-1L)
646                 return;
647 
648         card = chip->card;
649 
650         mutex_lock(&register_mutex);
651         if (atomic_inc_return(&chip->shutdown) == 1) {
652                 struct snd_usb_stream *as;
653                 struct snd_usb_endpoint *ep;
654                 struct usb_mixer_interface *mixer;
655 
656                 /* wait until all pending tasks done;
657                  * they are protected by snd_usb_lock_shutdown()
658                  */
659                 wait_event(chip->shutdown_wait,
660                            !atomic_read(&chip->usage_count));
661                 snd_card_disconnect(card);
662                 /* release the pcm resources */
663                 list_for_each_entry(as, &chip->pcm_list, list) {
664                         snd_usb_stream_disconnect(as);
665                 }
666                 /* release the endpoint resources */
667                 list_for_each_entry(ep, &chip->ep_list, list) {
668                         snd_usb_endpoint_release(ep);
669                 }
670                 /* release the midi resources */
671                 list_for_each(p, &chip->midi_list) {
672                         snd_usbmidi_disconnect(p);
673                 }
674                 /* release mixer resources */
675                 list_for_each_entry(mixer, &chip->mixer_list, list) {
676                         snd_usb_mixer_disconnect(mixer);
677                 }
678         }
679 
680         chip->num_interfaces--;
681         if (chip->num_interfaces <= 0) {
682                 usb_chip[chip->index] = NULL;
683                 mutex_unlock(&register_mutex);
684                 snd_card_free_when_closed(card);
685         } else {
686                 mutex_unlock(&register_mutex);
687         }
688 }
689 
690 /* lock the shutdown (disconnect) task and autoresume */
691 int snd_usb_lock_shutdown(struct snd_usb_audio *chip)
692 {
693         int err;
694 
695         atomic_inc(&chip->usage_count);
696         if (atomic_read(&chip->shutdown)) {
697                 err = -EIO;
698                 goto error;
699         }
700         err = snd_usb_autoresume(chip);
701         if (err < 0)
702                 goto error;
703         return 0;
704 
705  error:
706         if (atomic_dec_and_test(&chip->usage_count))
707                 wake_up(&chip->shutdown_wait);
708         return err;
709 }
710 
711 /* autosuspend and unlock the shutdown */
712 void snd_usb_unlock_shutdown(struct snd_usb_audio *chip)
713 {
714         snd_usb_autosuspend(chip);
715         if (atomic_dec_and_test(&chip->usage_count))
716                 wake_up(&chip->shutdown_wait);
717 }
718 
719 #ifdef CONFIG_PM
720 
721 int snd_usb_autoresume(struct snd_usb_audio *chip)
722 {
723         if (atomic_read(&chip->shutdown))
724                 return -EIO;
725         if (atomic_inc_return(&chip->active) == 1)
726                 return usb_autopm_get_interface(chip->pm_intf);
727         return 0;
728 }
729 
730 void snd_usb_autosuspend(struct snd_usb_audio *chip)
731 {
732         if (atomic_read(&chip->shutdown))
733                 return;
734         if (atomic_dec_and_test(&chip->active))
735                 usb_autopm_put_interface(chip->pm_intf);
736 }
737 
738 static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message)
739 {
740         struct snd_usb_audio *chip = usb_get_intfdata(intf);
741         struct snd_usb_stream *as;
742         struct usb_mixer_interface *mixer;
743         struct list_head *p;
744 
745         if (chip == (void *)-1L)
746                 return 0;
747 
748         chip->autosuspended = !!PMSG_IS_AUTO(message);
749         if (!chip->autosuspended)
750                 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot);
751         if (!chip->num_suspended_intf++) {
752                 list_for_each_entry(as, &chip->pcm_list, list) {
753                         snd_pcm_suspend_all(as->pcm);
754                         as->substream[0].need_setup_ep =
755                                 as->substream[1].need_setup_ep = true;
756                 }
757                 list_for_each(p, &chip->midi_list)
758                         snd_usbmidi_suspend(p);
759                 list_for_each_entry(mixer, &chip->mixer_list, list)
760                         snd_usb_mixer_suspend(mixer);
761         }
762 
763         return 0;
764 }
765 
766 static int __usb_audio_resume(struct usb_interface *intf, bool reset_resume)
767 {
768         struct snd_usb_audio *chip = usb_get_intfdata(intf);
769         struct usb_mixer_interface *mixer;
770         struct list_head *p;
771         int err = 0;
772 
773         if (chip == (void *)-1L)
774                 return 0;
775         if (--chip->num_suspended_intf)
776                 return 0;
777 
778         atomic_inc(&chip->active); /* avoid autopm */
779         /*
780          * ALSA leaves material resumption to user space
781          * we just notify and restart the mixers
782          */
783         list_for_each_entry(mixer, &chip->mixer_list, list) {
784                 err = snd_usb_mixer_resume(mixer, reset_resume);
785                 if (err < 0)
786                         goto err_out;
787         }
788 
789         list_for_each(p, &chip->midi_list) {
790                 snd_usbmidi_resume(p);
791         }
792 
793         if (!chip->autosuspended)
794                 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0);
795         chip->autosuspended = 0;
796 
797 err_out:
798         atomic_dec(&chip->active); /* allow autopm after this point */
799         return err;
800 }
801 
802 static int usb_audio_resume(struct usb_interface *intf)
803 {
804         return __usb_audio_resume(intf, false);
805 }
806 
807 static int usb_audio_reset_resume(struct usb_interface *intf)
808 {
809         return __usb_audio_resume(intf, true);
810 }
811 #else
812 #define usb_audio_suspend       NULL
813 #define usb_audio_resume        NULL
814 #define usb_audio_reset_resume  NULL
815 #endif          /* CONFIG_PM */
816 
817 static struct usb_device_id usb_audio_ids [] = {
818 #include "quirks-table.h"
819     { .match_flags = (USB_DEVICE_ID_MATCH_INT_CLASS | USB_DEVICE_ID_MATCH_INT_SUBCLASS),
820       .bInterfaceClass = USB_CLASS_AUDIO,
821       .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL },
822     { }                                         /* Terminating entry */
823 };
824 MODULE_DEVICE_TABLE(usb, usb_audio_ids);
825 
826 /*
827  * entry point for linux usb interface
828  */
829 
830 static struct usb_driver usb_audio_driver = {
831         .name =         "snd-usb-audio",
832         .probe =        usb_audio_probe,
833         .disconnect =   usb_audio_disconnect,
834         .suspend =      usb_audio_suspend,
835         .resume =       usb_audio_resume,
836         .reset_resume = usb_audio_reset_resume,
837         .id_table =     usb_audio_ids,
838         .supports_autosuspend = 1,
839 };
840 
841 module_usb_driver(usb_audio_driver);
842 

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