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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 
 86 module_param_array(index, int, NULL, 0444);
 87 MODULE_PARM_DESC(index, "Index value for the USB audio adapter.");
 88 module_param_array(id, charp, NULL, 0444);
 89 MODULE_PARM_DESC(id, "ID string for the USB audio adapter.");
 90 module_param_array(enable, bool, NULL, 0444);
 91 MODULE_PARM_DESC(enable, "Enable USB audio adapter.");
 92 module_param_array(vid, int, NULL, 0444);
 93 MODULE_PARM_DESC(vid, "Vendor ID for the USB audio device.");
 94 module_param_array(pid, int, NULL, 0444);
 95 MODULE_PARM_DESC(pid, "Product ID for the USB audio device.");
 96 module_param_array(device_setup, int, NULL, 0444);
 97 MODULE_PARM_DESC(device_setup, "Specific device setup (if needed).");
 98 module_param(ignore_ctl_error, bool, 0444);
 99 MODULE_PARM_DESC(ignore_ctl_error,
100                  "Ignore errors from USB controller for mixer interfaces.");
101 module_param(autoclock, bool, 0444);
102 MODULE_PARM_DESC(autoclock, "Enable auto-clock selection for UAC2 devices (default: yes).");
103 
104 /*
105  * we keep the snd_usb_audio_t instances by ourselves for merging
106  * the all interfaces on the same card as one sound device.
107  */
108 
109 static DEFINE_MUTEX(register_mutex);
110 static struct snd_usb_audio *usb_chip[SNDRV_CARDS];
111 static struct usb_driver usb_audio_driver;
112 
113 /*
114  * disconnect streams
115  * called from usb_audio_disconnect()
116  */
117 static void snd_usb_stream_disconnect(struct snd_usb_stream *as)
118 {
119         int idx;
120         struct snd_usb_substream *subs;
121 
122         for (idx = 0; idx < 2; idx++) {
123                 subs = &as->substream[idx];
124                 if (!subs->num_formats)
125                         continue;
126                 subs->interface = -1;
127                 subs->data_endpoint = NULL;
128                 subs->sync_endpoint = NULL;
129         }
130 }
131 
132 static int snd_usb_create_stream(struct snd_usb_audio *chip, int ctrlif, int interface)
133 {
134         struct usb_device *dev = chip->dev;
135         struct usb_host_interface *alts;
136         struct usb_interface_descriptor *altsd;
137         struct usb_interface *iface = usb_ifnum_to_if(dev, interface);
138 
139         if (!iface) {
140                 dev_err(&dev->dev, "%u:%d : does not exist\n",
141                         ctrlif, interface);
142                 return -EINVAL;
143         }
144 
145         alts = &iface->altsetting[0];
146         altsd = get_iface_desc(alts);
147 
148         /*
149          * Android with both accessory and audio interfaces enabled gets the
150          * interface numbers wrong.
151          */
152         if ((chip->usb_id == USB_ID(0x18d1, 0x2d04) ||
153              chip->usb_id == USB_ID(0x18d1, 0x2d05)) &&
154             interface == 0 &&
155             altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
156             altsd->bInterfaceSubClass == USB_SUBCLASS_VENDOR_SPEC) {
157                 interface = 2;
158                 iface = usb_ifnum_to_if(dev, interface);
159                 if (!iface)
160                         return -EINVAL;
161                 alts = &iface->altsetting[0];
162                 altsd = get_iface_desc(alts);
163         }
164 
165         if (usb_interface_claimed(iface)) {
166                 dev_dbg(&dev->dev, "%d:%d: skipping, already claimed\n",
167                         ctrlif, interface);
168                 return -EINVAL;
169         }
170 
171         if ((altsd->bInterfaceClass == USB_CLASS_AUDIO ||
172              altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC) &&
173             altsd->bInterfaceSubClass == USB_SUBCLASS_MIDISTREAMING) {
174                 int err = snd_usbmidi_create(chip->card, iface,
175                                              &chip->midi_list, NULL);
176                 if (err < 0) {
177                         dev_err(&dev->dev,
178                                 "%u:%d: cannot create sequencer device\n",
179                                 ctrlif, interface);
180                         return -EINVAL;
181                 }
182                 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L);
183 
184                 return 0;
185         }
186 
187         if ((altsd->bInterfaceClass != USB_CLASS_AUDIO &&
188              altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
189             altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING) {
190                 dev_dbg(&dev->dev,
191                         "%u:%d: skipping non-supported interface %d\n",
192                         ctrlif, interface, altsd->bInterfaceClass);
193                 /* skip non-supported classes */
194                 return -EINVAL;
195         }
196 
197         if (snd_usb_get_speed(dev) == USB_SPEED_LOW) {
198                 dev_err(&dev->dev, "low speed audio streaming not supported\n");
199                 return -EINVAL;
200         }
201 
202         if (! snd_usb_parse_audio_interface(chip, interface)) {
203                 usb_set_interface(dev, interface, 0); /* reset the current interface */
204                 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L);
205                 return -EINVAL;
206         }
207 
208         return 0;
209 }
210 
211 /*
212  * parse audio control descriptor and create pcm/midi streams
213  */
214 static int snd_usb_create_streams(struct snd_usb_audio *chip, int ctrlif)
215 {
216         struct usb_device *dev = chip->dev;
217         struct usb_host_interface *host_iface;
218         struct usb_interface_descriptor *altsd;
219         void *control_header;
220         int i, protocol;
221 
222         /* find audiocontrol interface */
223         host_iface = &usb_ifnum_to_if(dev, ctrlif)->altsetting[0];
224         control_header = snd_usb_find_csint_desc(host_iface->extra,
225                                                  host_iface->extralen,
226                                                  NULL, UAC_HEADER);
227         altsd = get_iface_desc(host_iface);
228         protocol = altsd->bInterfaceProtocol;
229 
230         if (!control_header) {
231                 dev_err(&dev->dev, "cannot find UAC_HEADER\n");
232                 return -EINVAL;
233         }
234 
235         switch (protocol) {
236         default:
237                 dev_warn(&dev->dev,
238                          "unknown interface protocol %#02x, assuming v1\n",
239                          protocol);
240                 /* fall through */
241 
242         case UAC_VERSION_1: {
243                 struct uac1_ac_header_descriptor *h1 = control_header;
244 
245                 if (!h1->bInCollection) {
246                         dev_info(&dev->dev, "skipping empty audio interface (v1)\n");
247                         return -EINVAL;
248                 }
249 
250                 if (h1->bLength < sizeof(*h1) + h1->bInCollection) {
251                         dev_err(&dev->dev, "invalid UAC_HEADER (v1)\n");
252                         return -EINVAL;
253                 }
254 
255                 for (i = 0; i < h1->bInCollection; i++)
256                         snd_usb_create_stream(chip, ctrlif, h1->baInterfaceNr[i]);
257 
258                 break;
259         }
260 
261         case UAC_VERSION_2: {
262                 struct usb_interface_assoc_descriptor *assoc =
263                         usb_ifnum_to_if(dev, ctrlif)->intf_assoc;
264 
265                 if (!assoc) {
266                         /*
267                          * Firmware writers cannot count to three.  So to find
268                          * the IAD on the NuForce UDH-100, also check the next
269                          * interface.
270                          */
271                         struct usb_interface *iface =
272                                 usb_ifnum_to_if(dev, ctrlif + 1);
273                         if (iface &&
274                             iface->intf_assoc &&
275                             iface->intf_assoc->bFunctionClass == USB_CLASS_AUDIO &&
276                             iface->intf_assoc->bFunctionProtocol == UAC_VERSION_2)
277                                 assoc = iface->intf_assoc;
278                 }
279 
280                 if (!assoc) {
281                         dev_err(&dev->dev, "Audio class v2 interfaces need an interface association\n");
282                         return -EINVAL;
283                 }
284 
285                 for (i = 0; i < assoc->bInterfaceCount; i++) {
286                         int intf = assoc->bFirstInterface + i;
287 
288                         if (intf != ctrlif)
289                                 snd_usb_create_stream(chip, ctrlif, intf);
290                 }
291 
292                 break;
293         }
294         }
295 
296         return 0;
297 }
298 
299 /*
300  * free the chip instance
301  *
302  * here we have to do not much, since pcm and controls are already freed
303  *
304  */
305 
306 static int snd_usb_audio_free(struct snd_usb_audio *chip)
307 {
308         struct snd_usb_endpoint *ep, *n;
309 
310         list_for_each_entry_safe(ep, n, &chip->ep_list, list)
311                 snd_usb_endpoint_free(ep);
312 
313         mutex_destroy(&chip->mutex);
314         kfree(chip);
315         return 0;
316 }
317 
318 static int snd_usb_audio_dev_free(struct snd_device *device)
319 {
320         struct snd_usb_audio *chip = device->device_data;
321         return snd_usb_audio_free(chip);
322 }
323 
324 /*
325  * create a chip instance and set its names.
326  */
327 static int snd_usb_audio_create(struct usb_interface *intf,
328                                 struct usb_device *dev, int idx,
329                                 const struct snd_usb_audio_quirk *quirk,
330                                 struct snd_usb_audio **rchip)
331 {
332         struct snd_card *card;
333         struct snd_usb_audio *chip;
334         int err, len;
335         char component[14];
336         static struct snd_device_ops ops = {
337                 .dev_free =     snd_usb_audio_dev_free,
338         };
339 
340         *rchip = NULL;
341 
342         switch (snd_usb_get_speed(dev)) {
343         case USB_SPEED_LOW:
344         case USB_SPEED_FULL:
345         case USB_SPEED_HIGH:
346         case USB_SPEED_WIRELESS:
347         case USB_SPEED_SUPER:
348                 break;
349         default:
350                 dev_err(&dev->dev, "unknown device speed %d\n", snd_usb_get_speed(dev));
351                 return -ENXIO;
352         }
353 
354         err = snd_card_new(&intf->dev, index[idx], id[idx], THIS_MODULE,
355                            0, &card);
356         if (err < 0) {
357                 dev_err(&dev->dev, "cannot create card instance %d\n", idx);
358                 return err;
359         }
360 
361         chip = kzalloc(sizeof(*chip), GFP_KERNEL);
362         if (! chip) {
363                 snd_card_free(card);
364                 return -ENOMEM;
365         }
366 
367         mutex_init(&chip->mutex);
368         init_waitqueue_head(&chip->shutdown_wait);
369         chip->index = idx;
370         chip->dev = dev;
371         chip->card = card;
372         chip->setup = device_setup[idx];
373         chip->autoclock = autoclock;
374         atomic_set(&chip->active, 1); /* avoid autopm during probing */
375         atomic_set(&chip->usage_count, 0);
376         atomic_set(&chip->shutdown, 0);
377 
378         chip->usb_id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
379                               le16_to_cpu(dev->descriptor.idProduct));
380         INIT_LIST_HEAD(&chip->pcm_list);
381         INIT_LIST_HEAD(&chip->ep_list);
382         INIT_LIST_HEAD(&chip->midi_list);
383         INIT_LIST_HEAD(&chip->mixer_list);
384 
385         if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) {
386                 snd_usb_audio_free(chip);
387                 snd_card_free(card);
388                 return err;
389         }
390 
391         strcpy(card->driver, "USB-Audio");
392         sprintf(component, "USB%04x:%04x",
393                 USB_ID_VENDOR(chip->usb_id), USB_ID_PRODUCT(chip->usb_id));
394         snd_component_add(card, component);
395 
396         /* retrieve the device string as shortname */
397         if (quirk && quirk->product_name && *quirk->product_name) {
398                 strlcpy(card->shortname, quirk->product_name, sizeof(card->shortname));
399         } else {
400                 if (!dev->descriptor.iProduct ||
401                     usb_string(dev, dev->descriptor.iProduct,
402                     card->shortname, sizeof(card->shortname)) <= 0) {
403                         /* no name available from anywhere, so use ID */
404                         sprintf(card->shortname, "USB Device %#04x:%#04x",
405                                 USB_ID_VENDOR(chip->usb_id),
406                                 USB_ID_PRODUCT(chip->usb_id));
407                 }
408         }
409         strim(card->shortname);
410 
411         /* retrieve the vendor and device strings as longname */
412         if (quirk && quirk->vendor_name && *quirk->vendor_name) {
413                 len = strlcpy(card->longname, quirk->vendor_name, sizeof(card->longname));
414         } else {
415                 if (dev->descriptor.iManufacturer)
416                         len = usb_string(dev, dev->descriptor.iManufacturer,
417                                          card->longname, sizeof(card->longname));
418                 else
419                         len = 0;
420                 /* we don't really care if there isn't any vendor string */
421         }
422         if (len > 0) {
423                 strim(card->longname);
424                 if (*card->longname)
425                         strlcat(card->longname, " ", sizeof(card->longname));
426         }
427 
428         strlcat(card->longname, card->shortname, sizeof(card->longname));
429 
430         len = strlcat(card->longname, " at ", sizeof(card->longname));
431 
432         if (len < sizeof(card->longname))
433                 usb_make_path(dev, card->longname + len, sizeof(card->longname) - len);
434 
435         switch (snd_usb_get_speed(dev)) {
436         case USB_SPEED_LOW:
437                 strlcat(card->longname, ", low speed", sizeof(card->longname));
438                 break;
439         case USB_SPEED_FULL:
440                 strlcat(card->longname, ", full speed", sizeof(card->longname));
441                 break;
442         case USB_SPEED_HIGH:
443                 strlcat(card->longname, ", high speed", sizeof(card->longname));
444                 break;
445         case USB_SPEED_SUPER:
446                 strlcat(card->longname, ", super speed", sizeof(card->longname));
447                 break;
448         default:
449                 break;
450         }
451 
452         snd_usb_audio_create_proc(chip);
453 
454         *rchip = chip;
455         return 0;
456 }
457 
458 /*
459  * probe the active usb device
460  *
461  * note that this can be called multiple times per a device, when it
462  * includes multiple audio control interfaces.
463  *
464  * thus we check the usb device pointer and creates the card instance
465  * only at the first time.  the successive calls of this function will
466  * append the pcm interface to the corresponding card.
467  */
468 static int usb_audio_probe(struct usb_interface *intf,
469                            const struct usb_device_id *usb_id)
470 {
471         struct usb_device *dev = interface_to_usbdev(intf);
472         const struct snd_usb_audio_quirk *quirk =
473                 (const struct snd_usb_audio_quirk *)usb_id->driver_info;
474         struct snd_usb_audio *chip;
475         int i, err;
476         struct usb_host_interface *alts;
477         int ifnum;
478         u32 id;
479 
480         alts = &intf->altsetting[0];
481         ifnum = get_iface_desc(alts)->bInterfaceNumber;
482         id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
483                     le16_to_cpu(dev->descriptor.idProduct));
484         if (quirk && quirk->ifnum >= 0 && ifnum != quirk->ifnum)
485                 return -ENXIO;
486 
487         err = snd_usb_apply_boot_quirk(dev, intf, quirk);
488         if (err < 0)
489                 return err;
490 
491         /*
492          * found a config.  now register to ALSA
493          */
494 
495         /* check whether it's already registered */
496         chip = NULL;
497         mutex_lock(&register_mutex);
498         for (i = 0; i < SNDRV_CARDS; i++) {
499                 if (usb_chip[i] && usb_chip[i]->dev == dev) {
500                         if (atomic_read(&usb_chip[i]->shutdown)) {
501                                 dev_err(&dev->dev, "USB device is in the shutdown state, cannot create a card instance\n");
502                                 err = -EIO;
503                                 goto __error;
504                         }
505                         chip = usb_chip[i];
506                         atomic_inc(&chip->active); /* avoid autopm */
507                         break;
508                 }
509         }
510         if (! chip) {
511                 /* it's a fresh one.
512                  * now look for an empty slot and create a new card instance
513                  */
514                 for (i = 0; i < SNDRV_CARDS; i++)
515                         if (enable[i] && ! usb_chip[i] &&
516                             (vid[i] == -1 || vid[i] == USB_ID_VENDOR(id)) &&
517                             (pid[i] == -1 || pid[i] == USB_ID_PRODUCT(id))) {
518                                 err = snd_usb_audio_create(intf, dev, i, quirk,
519                                                            &chip);
520                                 if (err < 0)
521                                         goto __error;
522                                 chip->pm_intf = intf;
523                                 break;
524                         }
525                 if (!chip) {
526                         dev_err(&dev->dev, "no available usb audio device\n");
527                         err = -ENODEV;
528                         goto __error;
529                 }
530         }
531 
532         /*
533          * For devices with more than one control interface, we assume the
534          * first contains the audio controls. We might need a more specific
535          * check here in the future.
536          */
537         if (!chip->ctrl_intf)
538                 chip->ctrl_intf = alts;
539 
540         chip->txfr_quirk = 0;
541         err = 1; /* continue */
542         if (quirk && quirk->ifnum != QUIRK_NO_INTERFACE) {
543                 /* need some special handlings */
544                 err = snd_usb_create_quirk(chip, intf, &usb_audio_driver, quirk);
545                 if (err < 0)
546                         goto __error;
547         }
548 
549         if (err > 0) {
550                 /* create normal USB audio interfaces */
551                 err = snd_usb_create_streams(chip, ifnum);
552                 if (err < 0)
553                         goto __error;
554                 err = snd_usb_create_mixer(chip, ifnum, ignore_ctl_error);
555                 if (err < 0)
556                         goto __error;
557         }
558 
559         /* we are allowed to call snd_card_register() many times */
560         err = snd_card_register(chip->card);
561         if (err < 0)
562                 goto __error;
563 
564         usb_chip[chip->index] = chip;
565         chip->num_interfaces++;
566         usb_set_intfdata(intf, chip);
567         atomic_dec(&chip->active);
568         mutex_unlock(&register_mutex);
569         return 0;
570 
571  __error:
572         if (chip) {
573                 if (!chip->num_interfaces)
574                         snd_card_free(chip->card);
575                 atomic_dec(&chip->active);
576         }
577         mutex_unlock(&register_mutex);
578         return err;
579 }
580 
581 /*
582  * we need to take care of counter, since disconnection can be called also
583  * many times as well as usb_audio_probe().
584  */
585 static void usb_audio_disconnect(struct usb_interface *intf)
586 {
587         struct snd_usb_audio *chip = usb_get_intfdata(intf);
588         struct snd_card *card;
589         struct list_head *p;
590 
591         if (chip == (void *)-1L)
592                 return;
593 
594         card = chip->card;
595 
596         mutex_lock(&register_mutex);
597         if (atomic_inc_return(&chip->shutdown) == 1) {
598                 struct snd_usb_stream *as;
599                 struct snd_usb_endpoint *ep;
600                 struct usb_mixer_interface *mixer;
601 
602                 /* wait until all pending tasks done;
603                  * they are protected by snd_usb_lock_shutdown()
604                  */
605                 wait_event(chip->shutdown_wait,
606                            !atomic_read(&chip->usage_count));
607                 snd_card_disconnect(card);
608                 /* release the pcm resources */
609                 list_for_each_entry(as, &chip->pcm_list, list) {
610                         snd_usb_stream_disconnect(as);
611                 }
612                 /* release the endpoint resources */
613                 list_for_each_entry(ep, &chip->ep_list, list) {
614                         snd_usb_endpoint_release(ep);
615                 }
616                 /* release the midi resources */
617                 list_for_each(p, &chip->midi_list) {
618                         snd_usbmidi_disconnect(p);
619                 }
620                 /* release mixer resources */
621                 list_for_each_entry(mixer, &chip->mixer_list, list) {
622                         snd_usb_mixer_disconnect(mixer);
623                 }
624         }
625 
626         chip->num_interfaces--;
627         if (chip->num_interfaces <= 0) {
628                 usb_chip[chip->index] = NULL;
629                 mutex_unlock(&register_mutex);
630                 snd_card_free_when_closed(card);
631         } else {
632                 mutex_unlock(&register_mutex);
633         }
634 }
635 
636 /* lock the shutdown (disconnect) task and autoresume */
637 int snd_usb_lock_shutdown(struct snd_usb_audio *chip)
638 {
639         int err;
640 
641         atomic_inc(&chip->usage_count);
642         if (atomic_read(&chip->shutdown)) {
643                 err = -EIO;
644                 goto error;
645         }
646         err = snd_usb_autoresume(chip);
647         if (err < 0)
648                 goto error;
649         return 0;
650 
651  error:
652         if (atomic_dec_and_test(&chip->usage_count))
653                 wake_up(&chip->shutdown_wait);
654         return err;
655 }
656 
657 /* autosuspend and unlock the shutdown */
658 void snd_usb_unlock_shutdown(struct snd_usb_audio *chip)
659 {
660         snd_usb_autosuspend(chip);
661         if (atomic_dec_and_test(&chip->usage_count))
662                 wake_up(&chip->shutdown_wait);
663 }
664 
665 #ifdef CONFIG_PM
666 
667 int snd_usb_autoresume(struct snd_usb_audio *chip)
668 {
669         if (atomic_read(&chip->shutdown))
670                 return -EIO;
671         if (atomic_inc_return(&chip->active) == 1)
672                 return usb_autopm_get_interface(chip->pm_intf);
673         return 0;
674 }
675 
676 void snd_usb_autosuspend(struct snd_usb_audio *chip)
677 {
678         if (atomic_dec_and_test(&chip->active))
679                 usb_autopm_put_interface(chip->pm_intf);
680 }
681 
682 static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message)
683 {
684         struct snd_usb_audio *chip = usb_get_intfdata(intf);
685         struct snd_usb_stream *as;
686         struct usb_mixer_interface *mixer;
687         struct list_head *p;
688 
689         if (chip == (void *)-1L)
690                 return 0;
691 
692         chip->autosuspended = !!PMSG_IS_AUTO(message);
693         if (!chip->autosuspended)
694                 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot);
695         if (!chip->num_suspended_intf++) {
696                 list_for_each_entry(as, &chip->pcm_list, list) {
697                         snd_pcm_suspend_all(as->pcm);
698                         as->substream[0].need_setup_ep =
699                                 as->substream[1].need_setup_ep = true;
700                 }
701                 list_for_each(p, &chip->midi_list)
702                         snd_usbmidi_suspend(p);
703                 list_for_each_entry(mixer, &chip->mixer_list, list)
704                         snd_usb_mixer_suspend(mixer);
705         }
706 
707         return 0;
708 }
709 
710 static int __usb_audio_resume(struct usb_interface *intf, bool reset_resume)
711 {
712         struct snd_usb_audio *chip = usb_get_intfdata(intf);
713         struct usb_mixer_interface *mixer;
714         struct list_head *p;
715         int err = 0;
716 
717         if (chip == (void *)-1L)
718                 return 0;
719         if (--chip->num_suspended_intf)
720                 return 0;
721 
722         atomic_inc(&chip->active); /* avoid autopm */
723         /*
724          * ALSA leaves material resumption to user space
725          * we just notify and restart the mixers
726          */
727         list_for_each_entry(mixer, &chip->mixer_list, list) {
728                 err = snd_usb_mixer_resume(mixer, reset_resume);
729                 if (err < 0)
730                         goto err_out;
731         }
732 
733         list_for_each(p, &chip->midi_list) {
734                 snd_usbmidi_resume(p);
735         }
736 
737         if (!chip->autosuspended)
738                 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0);
739         chip->autosuspended = 0;
740 
741 err_out:
742         atomic_dec(&chip->active); /* allow autopm after this point */
743         return err;
744 }
745 
746 static int usb_audio_resume(struct usb_interface *intf)
747 {
748         return __usb_audio_resume(intf, false);
749 }
750 
751 static int usb_audio_reset_resume(struct usb_interface *intf)
752 {
753         return __usb_audio_resume(intf, true);
754 }
755 #else
756 #define usb_audio_suspend       NULL
757 #define usb_audio_resume        NULL
758 #define usb_audio_reset_resume  NULL
759 #endif          /* CONFIG_PM */
760 
761 static struct usb_device_id usb_audio_ids [] = {
762 #include "quirks-table.h"
763     { .match_flags = (USB_DEVICE_ID_MATCH_INT_CLASS | USB_DEVICE_ID_MATCH_INT_SUBCLASS),
764       .bInterfaceClass = USB_CLASS_AUDIO,
765       .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL },
766     { }                                         /* Terminating entry */
767 };
768 MODULE_DEVICE_TABLE(usb, usb_audio_ids);
769 
770 /*
771  * entry point for linux usb interface
772  */
773 
774 static struct usb_driver usb_audio_driver = {
775         .name =         "snd-usb-audio",
776         .probe =        usb_audio_probe,
777         .disconnect =   usb_audio_disconnect,
778         .suspend =      usb_audio_suspend,
779         .resume =       usb_audio_resume,
780         .reset_resume = usb_audio_reset_resume,
781         .id_table =     usb_audio_ids,
782         .supports_autosuspend = 1,
783 };
784 
785 module_usb_driver(usb_audio_driver);
786 

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