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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         if (!atomic_read(&chip->shutdown))
319                 dev_set_drvdata(&chip->dev->dev, NULL);
320         kfree(chip);
321         return 0;
322 }
323 
324 static int snd_usb_audio_dev_free(struct snd_device *device)
325 {
326         struct snd_usb_audio *chip = device->device_data;
327         return snd_usb_audio_free(chip);
328 }
329 
330 /*
331  * create a chip instance and set its names.
332  */
333 static int snd_usb_audio_create(struct usb_interface *intf,
334                                 struct usb_device *dev, int idx,
335                                 const struct snd_usb_audio_quirk *quirk,
336                                 struct snd_usb_audio **rchip)
337 {
338         struct snd_card *card;
339         struct snd_usb_audio *chip;
340         int err, len;
341         char component[14];
342         static struct snd_device_ops ops = {
343                 .dev_free =     snd_usb_audio_dev_free,
344         };
345 
346         *rchip = NULL;
347 
348         switch (snd_usb_get_speed(dev)) {
349         case USB_SPEED_LOW:
350         case USB_SPEED_FULL:
351         case USB_SPEED_HIGH:
352         case USB_SPEED_WIRELESS:
353         case USB_SPEED_SUPER:
354         case USB_SPEED_SUPER_PLUS:
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_waitqueue_head(&chip->shutdown_wait);
376         chip->index = idx;
377         chip->dev = dev;
378         chip->card = card;
379         chip->setup = device_setup[idx];
380         chip->autoclock = autoclock;
381         atomic_set(&chip->active, 1); /* avoid autopm during probing */
382         atomic_set(&chip->usage_count, 0);
383         atomic_set(&chip->shutdown, 0);
384 
385         chip->usb_id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
386                               le16_to_cpu(dev->descriptor.idProduct));
387         INIT_LIST_HEAD(&chip->pcm_list);
388         INIT_LIST_HEAD(&chip->ep_list);
389         INIT_LIST_HEAD(&chip->midi_list);
390         INIT_LIST_HEAD(&chip->mixer_list);
391 
392         if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) {
393                 snd_usb_audio_free(chip);
394                 snd_card_free(card);
395                 return err;
396         }
397 
398         strcpy(card->driver, "USB-Audio");
399         sprintf(component, "USB%04x:%04x",
400                 USB_ID_VENDOR(chip->usb_id), USB_ID_PRODUCT(chip->usb_id));
401         snd_component_add(card, component);
402 
403         /* retrieve the device string as shortname */
404         if (quirk && quirk->product_name && *quirk->product_name) {
405                 strlcpy(card->shortname, quirk->product_name, sizeof(card->shortname));
406         } else {
407                 if (!dev->descriptor.iProduct ||
408                     usb_string(dev, dev->descriptor.iProduct,
409                     card->shortname, sizeof(card->shortname)) <= 0) {
410                         /* no name available from anywhere, so use ID */
411                         sprintf(card->shortname, "USB Device %#04x:%#04x",
412                                 USB_ID_VENDOR(chip->usb_id),
413                                 USB_ID_PRODUCT(chip->usb_id));
414                 }
415         }
416         strim(card->shortname);
417 
418         /* retrieve the vendor and device strings as longname */
419         if (quirk && quirk->vendor_name && *quirk->vendor_name) {
420                 len = strlcpy(card->longname, quirk->vendor_name, sizeof(card->longname));
421         } else {
422                 if (dev->descriptor.iManufacturer)
423                         len = usb_string(dev, dev->descriptor.iManufacturer,
424                                          card->longname, sizeof(card->longname));
425                 else
426                         len = 0;
427                 /* we don't really care if there isn't any vendor string */
428         }
429         if (len > 0) {
430                 strim(card->longname);
431                 if (*card->longname)
432                         strlcat(card->longname, " ", sizeof(card->longname));
433         }
434 
435         strlcat(card->longname, card->shortname, sizeof(card->longname));
436 
437         len = strlcat(card->longname, " at ", sizeof(card->longname));
438 
439         if (len < sizeof(card->longname))
440                 usb_make_path(dev, card->longname + len, sizeof(card->longname) - len);
441 
442         switch (snd_usb_get_speed(dev)) {
443         case USB_SPEED_LOW:
444                 strlcat(card->longname, ", low speed", sizeof(card->longname));
445                 break;
446         case USB_SPEED_FULL:
447                 strlcat(card->longname, ", full speed", sizeof(card->longname));
448                 break;
449         case USB_SPEED_HIGH:
450                 strlcat(card->longname, ", high speed", sizeof(card->longname));
451                 break;
452         case USB_SPEED_SUPER:
453                 strlcat(card->longname, ", super speed", sizeof(card->longname));
454                 break;
455         case USB_SPEED_SUPER_PLUS:
456                 strlcat(card->longname, ", super speed plus", sizeof(card->longname));
457                 break;
458         default:
459                 break;
460         }
461 
462         snd_usb_audio_create_proc(chip);
463 
464         *rchip = chip;
465         return 0;
466 }
467 
468 /* look for a matching quirk alias id */
469 static bool get_alias_id(struct usb_device *dev, unsigned int *id)
470 {
471         int i;
472         unsigned int src, dst;
473 
474         for (i = 0; i < ARRAY_SIZE(quirk_alias); i++) {
475                 if (!quirk_alias[i] ||
476                     sscanf(quirk_alias[i], "%x:%x", &src, &dst) != 2 ||
477                     src != *id)
478                         continue;
479                 dev_info(&dev->dev,
480                          "device (%04x:%04x): applying quirk alias %04x:%04x\n",
481                          USB_ID_VENDOR(*id), USB_ID_PRODUCT(*id),
482                          USB_ID_VENDOR(dst), USB_ID_PRODUCT(dst));
483                 *id = dst;
484                 return true;
485         }
486 
487         return false;
488 }
489 
490 static struct usb_device_id usb_audio_ids[]; /* defined below */
491 
492 /* look for the corresponding quirk */
493 static const struct snd_usb_audio_quirk *
494 get_alias_quirk(struct usb_device *dev, unsigned int id)
495 {
496         const struct usb_device_id *p;
497 
498         for (p = usb_audio_ids; p->match_flags; p++) {
499                 /* FIXME: this checks only vendor:product pair in the list */
500                 if ((p->match_flags & USB_DEVICE_ID_MATCH_DEVICE) ==
501                     USB_DEVICE_ID_MATCH_DEVICE &&
502                     p->idVendor == USB_ID_VENDOR(id) &&
503                     p->idProduct == USB_ID_PRODUCT(id))
504                         return (const struct snd_usb_audio_quirk *)p->driver_info;
505         }
506 
507         return NULL;
508 }
509 
510 /*
511  * probe the active usb device
512  *
513  * note that this can be called multiple times per a device, when it
514  * includes multiple audio control interfaces.
515  *
516  * thus we check the usb device pointer and creates the card instance
517  * only at the first time.  the successive calls of this function will
518  * append the pcm interface to the corresponding card.
519  */
520 static int usb_audio_probe(struct usb_interface *intf,
521                            const struct usb_device_id *usb_id)
522 {
523         struct usb_device *dev = interface_to_usbdev(intf);
524         const struct snd_usb_audio_quirk *quirk =
525                 (const struct snd_usb_audio_quirk *)usb_id->driver_info;
526         struct snd_usb_audio *chip;
527         int i, err;
528         struct usb_host_interface *alts;
529         int ifnum;
530         u32 id;
531 
532         alts = &intf->altsetting[0];
533         ifnum = get_iface_desc(alts)->bInterfaceNumber;
534         id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
535                     le16_to_cpu(dev->descriptor.idProduct));
536         if (get_alias_id(dev, &id))
537                 quirk = get_alias_quirk(dev, id);
538         if (quirk && quirk->ifnum >= 0 && ifnum != quirk->ifnum)
539                 return -ENXIO;
540 
541         err = snd_usb_apply_boot_quirk(dev, intf, quirk, id);
542         if (err < 0)
543                 return err;
544 
545         /*
546          * found a config.  now register to ALSA
547          */
548 
549         /* check whether it's already registered */
550         chip = NULL;
551         mutex_lock(&register_mutex);
552         for (i = 0; i < SNDRV_CARDS; i++) {
553                 if (usb_chip[i] && usb_chip[i]->dev == dev) {
554                         if (atomic_read(&usb_chip[i]->shutdown)) {
555                                 dev_err(&dev->dev, "USB device is in the shutdown state, cannot create a card instance\n");
556                                 err = -EIO;
557                                 goto __error;
558                         }
559                         chip = usb_chip[i];
560                         atomic_inc(&chip->active); /* avoid autopm */
561                         break;
562                 }
563         }
564         if (! chip) {
565                 /* it's a fresh one.
566                  * now look for an empty slot and create a new card instance
567                  */
568                 for (i = 0; i < SNDRV_CARDS; i++)
569                         if (enable[i] && ! usb_chip[i] &&
570                             (vid[i] == -1 || vid[i] == USB_ID_VENDOR(id)) &&
571                             (pid[i] == -1 || pid[i] == USB_ID_PRODUCT(id))) {
572                                 err = snd_usb_audio_create(intf, dev, i, quirk,
573                                                            &chip);
574                                 if (err < 0)
575                                         goto __error;
576                                 chip->pm_intf = intf;
577                                 break;
578                         }
579                 if (!chip) {
580                         dev_err(&dev->dev, "no available usb audio device\n");
581                         err = -ENODEV;
582                         goto __error;
583                 }
584         }
585         dev_set_drvdata(&dev->dev, chip);
586 
587         /*
588          * For devices with more than one control interface, we assume the
589          * first contains the audio controls. We might need a more specific
590          * check here in the future.
591          */
592         if (!chip->ctrl_intf)
593                 chip->ctrl_intf = alts;
594 
595         chip->txfr_quirk = 0;
596         err = 1; /* continue */
597         if (quirk && quirk->ifnum != QUIRK_NO_INTERFACE) {
598                 /* need some special handlings */
599                 err = snd_usb_create_quirk(chip, intf, &usb_audio_driver, quirk);
600                 if (err < 0)
601                         goto __error;
602         }
603 
604         if (err > 0) {
605                 /* create normal USB audio interfaces */
606                 err = snd_usb_create_streams(chip, ifnum);
607                 if (err < 0)
608                         goto __error;
609                 err = snd_usb_create_mixer(chip, ifnum, ignore_ctl_error);
610                 if (err < 0)
611                         goto __error;
612         }
613 
614         /* we are allowed to call snd_card_register() many times */
615         err = snd_card_register(chip->card);
616         if (err < 0)
617                 goto __error;
618 
619         usb_chip[chip->index] = chip;
620         chip->num_interfaces++;
621         usb_set_intfdata(intf, chip);
622         atomic_dec(&chip->active);
623         mutex_unlock(&register_mutex);
624         return 0;
625 
626  __error:
627         if (chip) {
628                 if (!chip->num_interfaces)
629                         snd_card_free(chip->card);
630                 atomic_dec(&chip->active);
631         }
632         mutex_unlock(&register_mutex);
633         return err;
634 }
635 
636 /*
637  * we need to take care of counter, since disconnection can be called also
638  * many times as well as usb_audio_probe().
639  */
640 static void usb_audio_disconnect(struct usb_interface *intf)
641 {
642         struct snd_usb_audio *chip = usb_get_intfdata(intf);
643         struct snd_card *card;
644         struct list_head *p;
645 
646         if (chip == (void *)-1L)
647                 return;
648 
649         card = chip->card;
650 
651         mutex_lock(&register_mutex);
652         if (atomic_inc_return(&chip->shutdown) == 1) {
653                 struct snd_usb_stream *as;
654                 struct snd_usb_endpoint *ep;
655                 struct usb_mixer_interface *mixer;
656 
657                 /* wait until all pending tasks done;
658                  * they are protected by snd_usb_lock_shutdown()
659                  */
660                 wait_event(chip->shutdown_wait,
661                            !atomic_read(&chip->usage_count));
662                 snd_card_disconnect(card);
663                 /* release the pcm resources */
664                 list_for_each_entry(as, &chip->pcm_list, list) {
665                         snd_usb_stream_disconnect(as);
666                 }
667                 /* release the endpoint resources */
668                 list_for_each_entry(ep, &chip->ep_list, list) {
669                         snd_usb_endpoint_release(ep);
670                 }
671                 /* release the midi resources */
672                 list_for_each(p, &chip->midi_list) {
673                         snd_usbmidi_disconnect(p);
674                 }
675                 /* release mixer resources */
676                 list_for_each_entry(mixer, &chip->mixer_list, list) {
677                         snd_usb_mixer_disconnect(mixer);
678                 }
679         }
680 
681         chip->num_interfaces--;
682         if (chip->num_interfaces <= 0) {
683                 usb_chip[chip->index] = NULL;
684                 mutex_unlock(&register_mutex);
685                 snd_card_free_when_closed(card);
686         } else {
687                 mutex_unlock(&register_mutex);
688         }
689 }
690 
691 /* lock the shutdown (disconnect) task and autoresume */
692 int snd_usb_lock_shutdown(struct snd_usb_audio *chip)
693 {
694         int err;
695 
696         atomic_inc(&chip->usage_count);
697         if (atomic_read(&chip->shutdown)) {
698                 err = -EIO;
699                 goto error;
700         }
701         err = snd_usb_autoresume(chip);
702         if (err < 0)
703                 goto error;
704         return 0;
705 
706  error:
707         if (atomic_dec_and_test(&chip->usage_count))
708                 wake_up(&chip->shutdown_wait);
709         return err;
710 }
711 
712 /* autosuspend and unlock the shutdown */
713 void snd_usb_unlock_shutdown(struct snd_usb_audio *chip)
714 {
715         snd_usb_autosuspend(chip);
716         if (atomic_dec_and_test(&chip->usage_count))
717                 wake_up(&chip->shutdown_wait);
718 }
719 
720 #ifdef CONFIG_PM
721 
722 int snd_usb_autoresume(struct snd_usb_audio *chip)
723 {
724         if (atomic_read(&chip->shutdown))
725                 return -EIO;
726         if (atomic_inc_return(&chip->active) == 1)
727                 return usb_autopm_get_interface(chip->pm_intf);
728         return 0;
729 }
730 
731 void snd_usb_autosuspend(struct snd_usb_audio *chip)
732 {
733         if (atomic_read(&chip->shutdown))
734                 return;
735         if (atomic_dec_and_test(&chip->active))
736                 usb_autopm_put_interface(chip->pm_intf);
737 }
738 
739 static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message)
740 {
741         struct snd_usb_audio *chip = usb_get_intfdata(intf);
742         struct snd_usb_stream *as;
743         struct usb_mixer_interface *mixer;
744         struct list_head *p;
745 
746         if (chip == (void *)-1L)
747                 return 0;
748 
749         chip->autosuspended = !!PMSG_IS_AUTO(message);
750         if (!chip->autosuspended)
751                 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot);
752         if (!chip->num_suspended_intf++) {
753                 list_for_each_entry(as, &chip->pcm_list, list) {
754                         snd_pcm_suspend_all(as->pcm);
755                         as->substream[0].need_setup_ep =
756                                 as->substream[1].need_setup_ep = true;
757                 }
758                 list_for_each(p, &chip->midi_list)
759                         snd_usbmidi_suspend(p);
760                 list_for_each_entry(mixer, &chip->mixer_list, list)
761                         snd_usb_mixer_suspend(mixer);
762         }
763 
764         return 0;
765 }
766 
767 static int __usb_audio_resume(struct usb_interface *intf, bool reset_resume)
768 {
769         struct snd_usb_audio *chip = usb_get_intfdata(intf);
770         struct usb_mixer_interface *mixer;
771         struct list_head *p;
772         int err = 0;
773 
774         if (chip == (void *)-1L)
775                 return 0;
776         if (--chip->num_suspended_intf)
777                 return 0;
778 
779         atomic_inc(&chip->active); /* avoid autopm */
780         /*
781          * ALSA leaves material resumption to user space
782          * we just notify and restart the mixers
783          */
784         list_for_each_entry(mixer, &chip->mixer_list, list) {
785                 err = snd_usb_mixer_resume(mixer, reset_resume);
786                 if (err < 0)
787                         goto err_out;
788         }
789 
790         list_for_each(p, &chip->midi_list) {
791                 snd_usbmidi_resume(p);
792         }
793 
794         if (!chip->autosuspended)
795                 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0);
796         chip->autosuspended = 0;
797 
798 err_out:
799         atomic_dec(&chip->active); /* allow autopm after this point */
800         return err;
801 }
802 
803 static int usb_audio_resume(struct usb_interface *intf)
804 {
805         return __usb_audio_resume(intf, false);
806 }
807 
808 static int usb_audio_reset_resume(struct usb_interface *intf)
809 {
810         return __usb_audio_resume(intf, true);
811 }
812 #else
813 #define usb_audio_suspend       NULL
814 #define usb_audio_resume        NULL
815 #define usb_audio_reset_resume  NULL
816 #endif          /* CONFIG_PM */
817 
818 static struct usb_device_id usb_audio_ids [] = {
819 #include "quirks-table.h"
820     { .match_flags = (USB_DEVICE_ID_MATCH_INT_CLASS | USB_DEVICE_ID_MATCH_INT_SUBCLASS),
821       .bInterfaceClass = USB_CLASS_AUDIO,
822       .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL },
823     { }                                         /* Terminating entry */
824 };
825 MODULE_DEVICE_TABLE(usb, usb_audio_ids);
826 
827 /*
828  * entry point for linux usb interface
829  */
830 
831 static struct usb_driver usb_audio_driver = {
832         .name =         "snd-usb-audio",
833         .probe =        usb_audio_probe,
834         .disconnect =   usb_audio_disconnect,
835         .suspend =      usb_audio_suspend,
836         .resume =       usb_audio_resume,
837         .reset_resume = usb_audio_reset_resume,
838         .id_table =     usb_audio_ids,
839         .supports_autosuspend = 1,
840 };
841 
842 module_usb_driver(usb_audio_driver);
843 

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