Version:  2.0.40 2.2.26 2.4.37 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17

Linux/sound/usb/card.c

  1 /*
  2  *   (Tentative) USB Audio Driver for ALSA
  3  *
  4  *   Copyright (c) 2002 by Takashi Iwai <tiwai@suse.de>
  5  *
  6  *   Many codes borrowed from audio.c by
  7  *          Alan Cox (alan@lxorguk.ukuu.org.uk)
  8  *          Thomas Sailer (sailer@ife.ee.ethz.ch)
  9  *
 10  *
 11  *   This program is free software; you can redistribute it and/or modify
 12  *   it under the terms of the GNU General Public License as published by
 13  *   the Free Software Foundation; either version 2 of the License, or
 14  *   (at your option) any later version.
 15  *
 16  *   This program is distributed in the hope that it will be useful,
 17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 19  *   GNU General Public License for more details.
 20  *
 21  *   You should have received a copy of the GNU General Public License
 22  *   along with this program; if not, write to the Free Software
 23  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 24  *
 25  *
 26  *  NOTES:
 27  *
 28  *   - the linked URBs would be preferred but not used so far because of
 29  *     the instability of unlinking.
 30  *   - type II is not supported properly.  there is no device which supports
 31  *     this type *correctly*.  SB extigy looks as if it supports, but it's
 32  *     indeed an AC3 stream packed in SPDIF frames (i.e. no real AC3 stream).
 33  */
 34 
 35 
 36 #include <linux/bitops.h>
 37 #include <linux/init.h>
 38 #include <linux/list.h>
 39 #include <linux/slab.h>
 40 #include <linux/string.h>
 41 #include <linux/ctype.h>
 42 #include <linux/usb.h>
 43 #include <linux/moduleparam.h>
 44 #include <linux/mutex.h>
 45 #include <linux/usb/audio.h>
 46 #include <linux/usb/audio-v2.h>
 47 #include <linux/module.h>
 48 
 49 #include <sound/control.h>
 50 #include <sound/core.h>
 51 #include <sound/info.h>
 52 #include <sound/pcm.h>
 53 #include <sound/pcm_params.h>
 54 #include <sound/initval.h>
 55 
 56 #include "usbaudio.h"
 57 #include "card.h"
 58 #include "midi.h"
 59 #include "mixer.h"
 60 #include "proc.h"
 61 #include "quirks.h"
 62 #include "endpoint.h"
 63 #include "helper.h"
 64 #include "debug.h"
 65 #include "pcm.h"
 66 #include "format.h"
 67 #include "power.h"
 68 #include "stream.h"
 69 
 70 MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
 71 MODULE_DESCRIPTION("USB Audio");
 72 MODULE_LICENSE("GPL");
 73 MODULE_SUPPORTED_DEVICE("{{Generic,USB Audio}}");
 74 
 75 
 76 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;      /* Index 0-MAX */
 77 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;       /* ID for this card */
 78 static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;/* Enable this card */
 79 /* Vendor/product IDs for this card */
 80 static int vid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 };
 81 static int pid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 };
 82 static int device_setup[SNDRV_CARDS]; /* device parameter for this card */
 83 static bool ignore_ctl_error;
 84 static bool autoclock = true;
 85 
 86 module_param_array(index, int, NULL, 0444);
 87 MODULE_PARM_DESC(index, "Index value for the USB audio adapter.");
 88 module_param_array(id, charp, NULL, 0444);
 89 MODULE_PARM_DESC(id, "ID string for the USB audio adapter.");
 90 module_param_array(enable, bool, NULL, 0444);
 91 MODULE_PARM_DESC(enable, "Enable USB audio adapter.");
 92 module_param_array(vid, int, NULL, 0444);
 93 MODULE_PARM_DESC(vid, "Vendor ID for the USB audio device.");
 94 module_param_array(pid, int, NULL, 0444);
 95 MODULE_PARM_DESC(pid, "Product ID for the USB audio device.");
 96 module_param_array(device_setup, int, NULL, 0444);
 97 MODULE_PARM_DESC(device_setup, "Specific device setup (if needed).");
 98 module_param(ignore_ctl_error, bool, 0444);
 99 MODULE_PARM_DESC(ignore_ctl_error,
100                  "Ignore errors from USB controller for mixer interfaces.");
101 module_param(autoclock, bool, 0444);
102 MODULE_PARM_DESC(autoclock, "Enable auto-clock selection for UAC2 devices (default: yes).");
103 
104 /*
105  * we keep the snd_usb_audio_t instances by ourselves for merging
106  * the all interfaces on the same card as one sound device.
107  */
108 
109 static DEFINE_MUTEX(register_mutex);
110 static struct snd_usb_audio *usb_chip[SNDRV_CARDS];
111 static struct usb_driver usb_audio_driver;
112 
113 /*
114  * disconnect streams
115  * called from snd_usb_audio_disconnect()
116  */
117 static void snd_usb_stream_disconnect(struct list_head *head)
118 {
119         int idx;
120         struct snd_usb_stream *as;
121         struct snd_usb_substream *subs;
122 
123         as = list_entry(head, struct snd_usb_stream, list);
124         for (idx = 0; idx < 2; idx++) {
125                 subs = &as->substream[idx];
126                 if (!subs->num_formats)
127                         continue;
128                 subs->interface = -1;
129                 subs->data_endpoint = NULL;
130                 subs->sync_endpoint = NULL;
131         }
132 }
133 
134 static int snd_usb_create_stream(struct snd_usb_audio *chip, int ctrlif, int interface)
135 {
136         struct usb_device *dev = chip->dev;
137         struct usb_host_interface *alts;
138         struct usb_interface_descriptor *altsd;
139         struct usb_interface *iface = usb_ifnum_to_if(dev, interface);
140 
141         if (!iface) {
142                 dev_err(&dev->dev, "%u:%d : does not exist\n",
143                         ctrlif, interface);
144                 return -EINVAL;
145         }
146 
147         alts = &iface->altsetting[0];
148         altsd = get_iface_desc(alts);
149 
150         /*
151          * Android with both accessory and audio interfaces enabled gets the
152          * interface numbers wrong.
153          */
154         if ((chip->usb_id == USB_ID(0x18d1, 0x2d04) ||
155              chip->usb_id == USB_ID(0x18d1, 0x2d05)) &&
156             interface == 0 &&
157             altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
158             altsd->bInterfaceSubClass == USB_SUBCLASS_VENDOR_SPEC) {
159                 interface = 2;
160                 iface = usb_ifnum_to_if(dev, interface);
161                 if (!iface)
162                         return -EINVAL;
163                 alts = &iface->altsetting[0];
164                 altsd = get_iface_desc(alts);
165         }
166 
167         if (usb_interface_claimed(iface)) {
168                 dev_dbg(&dev->dev, "%d:%d: skipping, already claimed\n",
169                         ctrlif, interface);
170                 return -EINVAL;
171         }
172 
173         if ((altsd->bInterfaceClass == USB_CLASS_AUDIO ||
174              altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC) &&
175             altsd->bInterfaceSubClass == USB_SUBCLASS_MIDISTREAMING) {
176                 int err = snd_usbmidi_create(chip->card, iface,
177                                              &chip->midi_list, NULL);
178                 if (err < 0) {
179                         dev_err(&dev->dev,
180                                 "%u:%d: cannot create sequencer device\n",
181                                 ctrlif, interface);
182                         return -EINVAL;
183                 }
184                 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L);
185 
186                 return 0;
187         }
188 
189         if ((altsd->bInterfaceClass != USB_CLASS_AUDIO &&
190              altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
191             altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING) {
192                 dev_dbg(&dev->dev,
193                         "%u:%d: skipping non-supported interface %d\n",
194                         ctrlif, interface, altsd->bInterfaceClass);
195                 /* skip non-supported classes */
196                 return -EINVAL;
197         }
198 
199         if (snd_usb_get_speed(dev) == USB_SPEED_LOW) {
200                 dev_err(&dev->dev, "low speed audio streaming not supported\n");
201                 return -EINVAL;
202         }
203 
204         if (! snd_usb_parse_audio_interface(chip, interface)) {
205                 usb_set_interface(dev, interface, 0); /* reset the current interface */
206                 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L);
207                 return -EINVAL;
208         }
209 
210         return 0;
211 }
212 
213 /*
214  * parse audio control descriptor and create pcm/midi streams
215  */
216 static int snd_usb_create_streams(struct snd_usb_audio *chip, int ctrlif)
217 {
218         struct usb_device *dev = chip->dev;
219         struct usb_host_interface *host_iface;
220         struct usb_interface_descriptor *altsd;
221         void *control_header;
222         int i, protocol;
223 
224         /* find audiocontrol interface */
225         host_iface = &usb_ifnum_to_if(dev, ctrlif)->altsetting[0];
226         control_header = snd_usb_find_csint_desc(host_iface->extra,
227                                                  host_iface->extralen,
228                                                  NULL, UAC_HEADER);
229         altsd = get_iface_desc(host_iface);
230         protocol = altsd->bInterfaceProtocol;
231 
232         if (!control_header) {
233                 dev_err(&dev->dev, "cannot find UAC_HEADER\n");
234                 return -EINVAL;
235         }
236 
237         switch (protocol) {
238         default:
239                 dev_warn(&dev->dev,
240                          "unknown interface protocol %#02x, assuming v1\n",
241                          protocol);
242                 /* fall through */
243 
244         case UAC_VERSION_1: {
245                 struct uac1_ac_header_descriptor *h1 = control_header;
246 
247                 if (!h1->bInCollection) {
248                         dev_info(&dev->dev, "skipping empty audio interface (v1)\n");
249                         return -EINVAL;
250                 }
251 
252                 if (h1->bLength < sizeof(*h1) + h1->bInCollection) {
253                         dev_err(&dev->dev, "invalid UAC_HEADER (v1)\n");
254                         return -EINVAL;
255                 }
256 
257                 for (i = 0; i < h1->bInCollection; i++)
258                         snd_usb_create_stream(chip, ctrlif, h1->baInterfaceNr[i]);
259 
260                 break;
261         }
262 
263         case UAC_VERSION_2: {
264                 struct usb_interface_assoc_descriptor *assoc =
265                         usb_ifnum_to_if(dev, ctrlif)->intf_assoc;
266 
267                 if (!assoc) {
268                         /*
269                          * Firmware writers cannot count to three.  So to find
270                          * the IAD on the NuForce UDH-100, also check the next
271                          * interface.
272                          */
273                         struct usb_interface *iface =
274                                 usb_ifnum_to_if(dev, ctrlif + 1);
275                         if (iface &&
276                             iface->intf_assoc &&
277                             iface->intf_assoc->bFunctionClass == USB_CLASS_AUDIO &&
278                             iface->intf_assoc->bFunctionProtocol == UAC_VERSION_2)
279                                 assoc = iface->intf_assoc;
280                 }
281 
282                 if (!assoc) {
283                         dev_err(&dev->dev, "Audio class v2 interfaces need an interface association\n");
284                         return -EINVAL;
285                 }
286 
287                 for (i = 0; i < assoc->bInterfaceCount; i++) {
288                         int intf = assoc->bFirstInterface + i;
289 
290                         if (intf != ctrlif)
291                                 snd_usb_create_stream(chip, ctrlif, intf);
292                 }
293 
294                 break;
295         }
296         }
297 
298         return 0;
299 }
300 
301 /*
302  * free the chip instance
303  *
304  * here we have to do not much, since pcm and controls are already freed
305  *
306  */
307 
308 static int snd_usb_audio_free(struct snd_usb_audio *chip)
309 {
310         struct list_head *p, *n;
311 
312         list_for_each_safe(p, n, &chip->ep_list)
313                 snd_usb_endpoint_free(p);
314 
315         mutex_destroy(&chip->mutex);
316         kfree(chip);
317         return 0;
318 }
319 
320 static int snd_usb_audio_dev_free(struct snd_device *device)
321 {
322         struct snd_usb_audio *chip = device->device_data;
323         return snd_usb_audio_free(chip);
324 }
325 
326 static void remove_trailing_spaces(char *str)
327 {
328         char *p;
329 
330         if (!*str)
331                 return;
332         for (p = str + strlen(str) - 1; p >= str && isspace(*p); p--)
333                 *p = 0;
334 }
335 
336 /*
337  * create a chip instance and set its names.
338  */
339 static int snd_usb_audio_create(struct usb_interface *intf,
340                                 struct usb_device *dev, int idx,
341                                 const struct snd_usb_audio_quirk *quirk,
342                                 struct snd_usb_audio **rchip)
343 {
344         struct snd_card *card;
345         struct snd_usb_audio *chip;
346         int err, len;
347         char component[14];
348         static struct snd_device_ops ops = {
349                 .dev_free =     snd_usb_audio_dev_free,
350         };
351 
352         *rchip = NULL;
353 
354         switch (snd_usb_get_speed(dev)) {
355         case USB_SPEED_LOW:
356         case USB_SPEED_FULL:
357         case USB_SPEED_HIGH:
358         case USB_SPEED_WIRELESS:
359         case USB_SPEED_SUPER:
360                 break;
361         default:
362                 dev_err(&dev->dev, "unknown device speed %d\n", snd_usb_get_speed(dev));
363                 return -ENXIO;
364         }
365 
366         err = snd_card_new(&intf->dev, index[idx], id[idx], THIS_MODULE,
367                            0, &card);
368         if (err < 0) {
369                 dev_err(&dev->dev, "cannot create card instance %d\n", idx);
370                 return err;
371         }
372 
373         chip = kzalloc(sizeof(*chip), GFP_KERNEL);
374         if (! chip) {
375                 snd_card_free(card);
376                 return -ENOMEM;
377         }
378 
379         mutex_init(&chip->mutex);
380         init_rwsem(&chip->shutdown_rwsem);
381         chip->index = idx;
382         chip->dev = dev;
383         chip->card = card;
384         chip->setup = device_setup[idx];
385         chip->autoclock = autoclock;
386         chip->probing = 1;
387 
388         chip->usb_id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
389                               le16_to_cpu(dev->descriptor.idProduct));
390         INIT_LIST_HEAD(&chip->pcm_list);
391         INIT_LIST_HEAD(&chip->ep_list);
392         INIT_LIST_HEAD(&chip->midi_list);
393         INIT_LIST_HEAD(&chip->mixer_list);
394 
395         if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) {
396                 snd_usb_audio_free(chip);
397                 snd_card_free(card);
398                 return err;
399         }
400 
401         strcpy(card->driver, "USB-Audio");
402         sprintf(component, "USB%04x:%04x",
403                 USB_ID_VENDOR(chip->usb_id), USB_ID_PRODUCT(chip->usb_id));
404         snd_component_add(card, component);
405 
406         /* retrieve the device string as shortname */
407         if (quirk && quirk->product_name && *quirk->product_name) {
408                 strlcpy(card->shortname, quirk->product_name, sizeof(card->shortname));
409         } else {
410                 if (!dev->descriptor.iProduct ||
411                     usb_string(dev, dev->descriptor.iProduct,
412                     card->shortname, sizeof(card->shortname)) <= 0) {
413                         /* no name available from anywhere, so use ID */
414                         sprintf(card->shortname, "USB Device %#04x:%#04x",
415                                 USB_ID_VENDOR(chip->usb_id),
416                                 USB_ID_PRODUCT(chip->usb_id));
417                 }
418         }
419         remove_trailing_spaces(card->shortname);
420 
421         /* retrieve the vendor and device strings as longname */
422         if (quirk && quirk->vendor_name && *quirk->vendor_name) {
423                 len = strlcpy(card->longname, quirk->vendor_name, sizeof(card->longname));
424         } else {
425                 if (dev->descriptor.iManufacturer)
426                         len = usb_string(dev, dev->descriptor.iManufacturer,
427                                          card->longname, sizeof(card->longname));
428                 else
429                         len = 0;
430                 /* we don't really care if there isn't any vendor string */
431         }
432         if (len > 0) {
433                 remove_trailing_spaces(card->longname);
434                 if (*card->longname)
435                         strlcat(card->longname, " ", sizeof(card->longname));
436         }
437 
438         strlcat(card->longname, card->shortname, sizeof(card->longname));
439 
440         len = strlcat(card->longname, " at ", sizeof(card->longname));
441 
442         if (len < sizeof(card->longname))
443                 usb_make_path(dev, card->longname + len, sizeof(card->longname) - len);
444 
445         switch (snd_usb_get_speed(dev)) {
446         case USB_SPEED_LOW:
447                 strlcat(card->longname, ", low speed", sizeof(card->longname));
448                 break;
449         case USB_SPEED_FULL:
450                 strlcat(card->longname, ", full speed", sizeof(card->longname));
451                 break;
452         case USB_SPEED_HIGH:
453                 strlcat(card->longname, ", high speed", sizeof(card->longname));
454                 break;
455         case USB_SPEED_SUPER:
456                 strlcat(card->longname, ", super speed", 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 /*
469  * probe the active usb device
470  *
471  * note that this can be called multiple times per a device, when it
472  * includes multiple audio control interfaces.
473  *
474  * thus we check the usb device pointer and creates the card instance
475  * only at the first time.  the successive calls of this function will
476  * append the pcm interface to the corresponding card.
477  */
478 static struct snd_usb_audio *
479 snd_usb_audio_probe(struct usb_device *dev,
480                     struct usb_interface *intf,
481                     const struct usb_device_id *usb_id)
482 {
483         const struct snd_usb_audio_quirk *quirk = (const struct snd_usb_audio_quirk *)usb_id->driver_info;
484         int i, err;
485         struct snd_usb_audio *chip;
486         struct usb_host_interface *alts;
487         int ifnum;
488         u32 id;
489 
490         alts = &intf->altsetting[0];
491         ifnum = get_iface_desc(alts)->bInterfaceNumber;
492         id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
493                     le16_to_cpu(dev->descriptor.idProduct));
494         if (quirk && quirk->ifnum >= 0 && ifnum != quirk->ifnum)
495                 goto __err_val;
496 
497         if (snd_usb_apply_boot_quirk(dev, intf, quirk) < 0)
498                 goto __err_val;
499 
500         /*
501          * found a config.  now register to ALSA
502          */
503 
504         /* check whether it's already registered */
505         chip = NULL;
506         mutex_lock(&register_mutex);
507         for (i = 0; i < SNDRV_CARDS; i++) {
508                 if (usb_chip[i] && usb_chip[i]->dev == dev) {
509                         if (usb_chip[i]->shutdown) {
510                                 dev_err(&dev->dev, "USB device is in the shutdown state, cannot create a card instance\n");
511                                 goto __error;
512                         }
513                         chip = usb_chip[i];
514                         chip->probing = 1;
515                         break;
516                 }
517         }
518         if (! chip) {
519                 /* it's a fresh one.
520                  * now look for an empty slot and create a new card instance
521                  */
522                 for (i = 0; i < SNDRV_CARDS; i++)
523                         if (enable[i] && ! usb_chip[i] &&
524                             (vid[i] == -1 || vid[i] == USB_ID_VENDOR(id)) &&
525                             (pid[i] == -1 || pid[i] == USB_ID_PRODUCT(id))) {
526                                 if (snd_usb_audio_create(intf, dev, i, quirk,
527                                                          &chip) < 0) {
528                                         goto __error;
529                                 }
530                                 chip->pm_intf = intf;
531                                 break;
532                         }
533                 if (!chip) {
534                         dev_err(&dev->dev, "no available usb audio device\n");
535                         goto __error;
536                 }
537         }
538 
539         /*
540          * For devices with more than one control interface, we assume the
541          * first contains the audio controls. We might need a more specific
542          * check here in the future.
543          */
544         if (!chip->ctrl_intf)
545                 chip->ctrl_intf = alts;
546 
547         chip->txfr_quirk = 0;
548         err = 1; /* continue */
549         if (quirk && quirk->ifnum != QUIRK_NO_INTERFACE) {
550                 /* need some special handlings */
551                 if ((err = snd_usb_create_quirk(chip, intf, &usb_audio_driver, quirk)) < 0)
552                         goto __error;
553         }
554 
555         if (err > 0) {
556                 /* create normal USB audio interfaces */
557                 if (snd_usb_create_streams(chip, ifnum) < 0 ||
558                     snd_usb_create_mixer(chip, ifnum, ignore_ctl_error) < 0) {
559                         goto __error;
560                 }
561         }
562 
563         /* we are allowed to call snd_card_register() many times */
564         if (snd_card_register(chip->card) < 0) {
565                 goto __error;
566         }
567 
568         usb_chip[chip->index] = chip;
569         chip->num_interfaces++;
570         chip->probing = 0;
571         mutex_unlock(&register_mutex);
572         return chip;
573 
574  __error:
575         if (chip) {
576                 if (!chip->num_interfaces)
577                         snd_card_free(chip->card);
578                 chip->probing = 0;
579         }
580         mutex_unlock(&register_mutex);
581  __err_val:
582         return NULL;
583 }
584 
585 /*
586  * we need to take care of counter, since disconnection can be called also
587  * many times as well as usb_audio_probe().
588  */
589 static void snd_usb_audio_disconnect(struct usb_device *dev,
590                                      struct snd_usb_audio *chip)
591 {
592         struct snd_card *card;
593         struct list_head *p;
594 
595         if (chip == (void *)-1L)
596                 return;
597 
598         card = chip->card;
599         down_write(&chip->shutdown_rwsem);
600         chip->shutdown = 1;
601         up_write(&chip->shutdown_rwsem);
602 
603         mutex_lock(&register_mutex);
604         chip->num_interfaces--;
605         if (chip->num_interfaces <= 0) {
606                 struct snd_usb_endpoint *ep;
607 
608                 snd_card_disconnect(card);
609                 /* release the pcm resources */
610                 list_for_each(p, &chip->pcm_list) {
611                         snd_usb_stream_disconnect(p);
612                 }
613                 /* release the endpoint resources */
614                 list_for_each_entry(ep, &chip->ep_list, list) {
615                         snd_usb_endpoint_release(ep);
616                 }
617                 /* release the midi resources */
618                 list_for_each(p, &chip->midi_list) {
619                         snd_usbmidi_disconnect(p);
620                 }
621                 /* release mixer resources */
622                 list_for_each(p, &chip->mixer_list) {
623                         snd_usb_mixer_disconnect(p);
624                 }
625                 usb_chip[chip->index] = NULL;
626                 mutex_unlock(&register_mutex);
627                 snd_card_free_when_closed(card);
628         } else {
629                 mutex_unlock(&register_mutex);
630         }
631 }
632 
633 /*
634  * new 2.5 USB kernel API
635  */
636 static int usb_audio_probe(struct usb_interface *intf,
637                            const struct usb_device_id *id)
638 {
639         struct snd_usb_audio *chip;
640         chip = snd_usb_audio_probe(interface_to_usbdev(intf), intf, id);
641         if (chip) {
642                 usb_set_intfdata(intf, chip);
643                 return 0;
644         } else
645                 return -EIO;
646 }
647 
648 static void usb_audio_disconnect(struct usb_interface *intf)
649 {
650         snd_usb_audio_disconnect(interface_to_usbdev(intf),
651                                  usb_get_intfdata(intf));
652 }
653 
654 #ifdef CONFIG_PM
655 
656 int snd_usb_autoresume(struct snd_usb_audio *chip)
657 {
658         int err = -ENODEV;
659 
660         down_read(&chip->shutdown_rwsem);
661         if (chip->probing && chip->in_pm)
662                 err = 0;
663         else if (!chip->shutdown)
664                 err = usb_autopm_get_interface(chip->pm_intf);
665         up_read(&chip->shutdown_rwsem);
666 
667         return err;
668 }
669 
670 void snd_usb_autosuspend(struct snd_usb_audio *chip)
671 {
672         down_read(&chip->shutdown_rwsem);
673         if (!chip->shutdown && !chip->probing && !chip->in_pm)
674                 usb_autopm_put_interface(chip->pm_intf);
675         up_read(&chip->shutdown_rwsem);
676 }
677 
678 static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message)
679 {
680         struct snd_usb_audio *chip = usb_get_intfdata(intf);
681         struct snd_usb_stream *as;
682         struct usb_mixer_interface *mixer;
683         struct list_head *p;
684 
685         if (chip == (void *)-1L)
686                 return 0;
687 
688         if (!PMSG_IS_AUTO(message)) {
689                 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot);
690                 if (!chip->num_suspended_intf++) {
691                         list_for_each_entry(as, &chip->pcm_list, list) {
692                                 snd_pcm_suspend_all(as->pcm);
693                                 as->substream[0].need_setup_ep =
694                                         as->substream[1].need_setup_ep = true;
695                         }
696                         list_for_each(p, &chip->midi_list) {
697                                 snd_usbmidi_suspend(p);
698                         }
699                 }
700         } else {
701                 /*
702                  * otherwise we keep the rest of the system in the dark
703                  * to keep this transparent
704                  */
705                 if (!chip->num_suspended_intf++)
706                         chip->autosuspended = 1;
707         }
708 
709         if (chip->num_suspended_intf == 1)
710                 list_for_each_entry(mixer, &chip->mixer_list, list)
711                         snd_usb_mixer_suspend(mixer);
712 
713         return 0;
714 }
715 
716 static int __usb_audio_resume(struct usb_interface *intf, bool reset_resume)
717 {
718         struct snd_usb_audio *chip = usb_get_intfdata(intf);
719         struct usb_mixer_interface *mixer;
720         struct list_head *p;
721         int err = 0;
722 
723         if (chip == (void *)-1L)
724                 return 0;
725         if (--chip->num_suspended_intf)
726                 return 0;
727 
728         chip->in_pm = 1;
729         /*
730          * ALSA leaves material resumption to user space
731          * we just notify and restart the mixers
732          */
733         list_for_each_entry(mixer, &chip->mixer_list, list) {
734                 err = snd_usb_mixer_resume(mixer, reset_resume);
735                 if (err < 0)
736                         goto err_out;
737         }
738 
739         list_for_each(p, &chip->midi_list) {
740                 snd_usbmidi_resume(p);
741         }
742 
743         if (!chip->autosuspended)
744                 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0);
745         chip->autosuspended = 0;
746 
747 err_out:
748         chip->in_pm = 0;
749         return err;
750 }
751 
752 static int usb_audio_resume(struct usb_interface *intf)
753 {
754         return __usb_audio_resume(intf, false);
755 }
756 
757 static int usb_audio_reset_resume(struct usb_interface *intf)
758 {
759         return __usb_audio_resume(intf, true);
760 }
761 #else
762 #define usb_audio_suspend       NULL
763 #define usb_audio_resume        NULL
764 #define usb_audio_reset_resume  NULL
765 #endif          /* CONFIG_PM */
766 
767 static struct usb_device_id usb_audio_ids [] = {
768 #include "quirks-table.h"
769     { .match_flags = (USB_DEVICE_ID_MATCH_INT_CLASS | USB_DEVICE_ID_MATCH_INT_SUBCLASS),
770       .bInterfaceClass = USB_CLASS_AUDIO,
771       .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL },
772     { }                                         /* Terminating entry */
773 };
774 MODULE_DEVICE_TABLE(usb, usb_audio_ids);
775 
776 /*
777  * entry point for linux usb interface
778  */
779 
780 static struct usb_driver usb_audio_driver = {
781         .name =         "snd-usb-audio",
782         .probe =        usb_audio_probe,
783         .disconnect =   usb_audio_disconnect,
784         .suspend =      usb_audio_suspend,
785         .resume =       usb_audio_resume,
786         .reset_resume = usb_audio_reset_resume,
787         .id_table =     usb_audio_ids,
788         .supports_autosuspend = 1,
789 };
790 
791 module_usb_driver(usb_audio_driver);
792 

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