ALSA: usb - Remove trailing spaces from USB card name strings
[linux-2.6.git] / 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  *   - async unlink should be used for avoiding the sleep inside lock.
29  *     2.4.22 usb-uhci seems buggy for async unlinking and results in
30  *     oops.  in such a cse, pass async_unlink=0 option.
31  *   - the linked URBs would be preferred but not used so far because of
32  *     the instability of unlinking.
33  *   - type II is not supported properly.  there is no device which supports
34  *     this type *correctly*.  SB extigy looks as if it supports, but it's
35  *     indeed an AC3 stream packed in SPDIF frames (i.e. no real AC3 stream).
36  */
37
38
39 #include <linux/bitops.h>
40 #include <linux/init.h>
41 #include <linux/list.h>
42 #include <linux/slab.h>
43 #include <linux/string.h>
44 #include <linux/ctype.h>
45 #include <linux/usb.h>
46 #include <linux/moduleparam.h>
47 #include <linux/mutex.h>
48 #include <linux/usb/audio.h>
49 #include <linux/usb/audio-v2.h>
50
51 #include <sound/core.h>
52 #include <sound/info.h>
53 #include <sound/pcm.h>
54 #include <sound/pcm_params.h>
55 #include <sound/initval.h>
56
57 #include "usbaudio.h"
58 #include "card.h"
59 #include "midi.h"
60 #include "mixer.h"
61 #include "proc.h"
62 #include "quirks.h"
63 #include "endpoint.h"
64 #include "helper.h"
65 #include "debug.h"
66 #include "pcm.h"
67 #include "urb.h"
68 #include "format.h"
69 #include "power.h"
70
71 MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
72 MODULE_DESCRIPTION("USB Audio");
73 MODULE_LICENSE("GPL");
74 MODULE_SUPPORTED_DEVICE("{{Generic,USB Audio}}");
75
76
77 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;      /* Index 0-MAX */
78 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;       /* ID for this card */
79 static int enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;/* Enable this card */
80 /* Vendor/product IDs for this card */
81 static int vid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 };
82 static int pid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 };
83 static int nrpacks = 8;         /* max. number of packets per urb */
84 static int async_unlink = 1;
85 static int device_setup[SNDRV_CARDS]; /* device parameter for this card */
86 static int ignore_ctl_error;
87
88 module_param_array(index, int, NULL, 0444);
89 MODULE_PARM_DESC(index, "Index value for the USB audio adapter.");
90 module_param_array(id, charp, NULL, 0444);
91 MODULE_PARM_DESC(id, "ID string for the USB audio adapter.");
92 module_param_array(enable, bool, NULL, 0444);
93 MODULE_PARM_DESC(enable, "Enable USB audio adapter.");
94 module_param_array(vid, int, NULL, 0444);
95 MODULE_PARM_DESC(vid, "Vendor ID for the USB audio device.");
96 module_param_array(pid, int, NULL, 0444);
97 MODULE_PARM_DESC(pid, "Product ID for the USB audio device.");
98 module_param(nrpacks, int, 0644);
99 MODULE_PARM_DESC(nrpacks, "Max. number of packets per URB.");
100 module_param(async_unlink, bool, 0444);
101 MODULE_PARM_DESC(async_unlink, "Use async unlink mode.");
102 module_param_array(device_setup, int, NULL, 0444);
103 MODULE_PARM_DESC(device_setup, "Specific device setup (if needed).");
104 module_param(ignore_ctl_error, bool, 0444);
105 MODULE_PARM_DESC(ignore_ctl_error,
106                  "Ignore errors from USB controller for mixer interfaces.");
107
108 /*
109  * we keep the snd_usb_audio_t instances by ourselves for merging
110  * the all interfaces on the same card as one sound device.
111  */
112
113 static DEFINE_MUTEX(register_mutex);
114 static struct snd_usb_audio *usb_chip[SNDRV_CARDS];
115 static struct usb_driver usb_audio_driver;
116
117 /*
118  * disconnect streams
119  * called from snd_usb_audio_disconnect()
120  */
121 static void snd_usb_stream_disconnect(struct list_head *head)
122 {
123         int idx;
124         struct snd_usb_stream *as;
125         struct snd_usb_substream *subs;
126
127         as = list_entry(head, struct snd_usb_stream, list);
128         for (idx = 0; idx < 2; idx++) {
129                 subs = &as->substream[idx];
130                 if (!subs->num_formats)
131                         continue;
132                 snd_usb_release_substream_urbs(subs, 1);
133                 subs->interface = -1;
134         }
135 }
136
137 static int snd_usb_create_stream(struct snd_usb_audio *chip, int ctrlif, int interface)
138 {
139         struct usb_device *dev = chip->dev;
140         struct usb_host_interface *alts;
141         struct usb_interface_descriptor *altsd;
142         struct usb_interface *iface = usb_ifnum_to_if(dev, interface);
143
144         if (!iface) {
145                 snd_printk(KERN_ERR "%d:%u:%d : does not exist\n",
146                            dev->devnum, ctrlif, interface);
147                 return -EINVAL;
148         }
149
150         if (usb_interface_claimed(iface)) {
151                 snd_printdd(KERN_INFO "%d:%d:%d: skipping, already claimed\n",
152                                                 dev->devnum, ctrlif, interface);
153                 return -EINVAL;
154         }
155
156         alts = &iface->altsetting[0];
157         altsd = get_iface_desc(alts);
158         if ((altsd->bInterfaceClass == USB_CLASS_AUDIO ||
159              altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC) &&
160             altsd->bInterfaceSubClass == USB_SUBCLASS_MIDISTREAMING) {
161                 int err = snd_usbmidi_create(chip->card, iface,
162                                              &chip->midi_list, NULL);
163                 if (err < 0) {
164                         snd_printk(KERN_ERR "%d:%u:%d: cannot create sequencer device\n",
165                                                 dev->devnum, ctrlif, interface);
166                         return -EINVAL;
167                 }
168                 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L);
169
170                 return 0;
171         }
172
173         if ((altsd->bInterfaceClass != USB_CLASS_AUDIO &&
174              altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
175             altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING) {
176                 snd_printdd(KERN_ERR "%d:%u:%d: skipping non-supported interface %d\n",
177                                         dev->devnum, ctrlif, interface, altsd->bInterfaceClass);
178                 /* skip non-supported classes */
179                 return -EINVAL;
180         }
181
182         if (snd_usb_get_speed(dev) == USB_SPEED_LOW) {
183                 snd_printk(KERN_ERR "low speed audio streaming not supported\n");
184                 return -EINVAL;
185         }
186
187         if (! snd_usb_parse_audio_endpoints(chip, interface)) {
188                 usb_set_interface(dev, interface, 0); /* reset the current interface */
189                 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L);
190                 return -EINVAL;
191         }
192
193         return 0;
194 }
195
196 /*
197  * parse audio control descriptor and create pcm/midi streams
198  */
199 static int snd_usb_create_streams(struct snd_usb_audio *chip, int ctrlif)
200 {
201         struct usb_device *dev = chip->dev;
202         struct usb_host_interface *host_iface;
203         struct usb_interface_descriptor *altsd;
204         void *control_header;
205         int i, protocol;
206
207         /* find audiocontrol interface */
208         host_iface = &usb_ifnum_to_if(dev, ctrlif)->altsetting[0];
209         control_header = snd_usb_find_csint_desc(host_iface->extra,
210                                                  host_iface->extralen,
211                                                  NULL, UAC_HEADER);
212         altsd = get_iface_desc(host_iface);
213         protocol = altsd->bInterfaceProtocol;
214
215         if (!control_header) {
216                 snd_printk(KERN_ERR "cannot find UAC_HEADER\n");
217                 return -EINVAL;
218         }
219
220         switch (protocol) {
221         default:
222                 snd_printdd(KERN_WARNING "unknown interface protocol %#02x, assuming v1\n",
223                             protocol);
224                 /* fall through */
225
226         case UAC_VERSION_1: {
227                 struct uac1_ac_header_descriptor *h1 = control_header;
228
229                 if (!h1->bInCollection) {
230                         snd_printk(KERN_INFO "skipping empty audio interface (v1)\n");
231                         return -EINVAL;
232                 }
233
234                 if (h1->bLength < sizeof(*h1) + h1->bInCollection) {
235                         snd_printk(KERN_ERR "invalid UAC_HEADER (v1)\n");
236                         return -EINVAL;
237                 }
238
239                 for (i = 0; i < h1->bInCollection; i++)
240                         snd_usb_create_stream(chip, ctrlif, h1->baInterfaceNr[i]);
241
242                 break;
243         }
244
245         case UAC_VERSION_2: {
246                 struct usb_interface_assoc_descriptor *assoc =
247                         usb_ifnum_to_if(dev, ctrlif)->intf_assoc;
248
249                 if (!assoc) {
250                         snd_printk(KERN_ERR "Audio class v2 interfaces need an interface association\n");
251                         return -EINVAL;
252                 }
253
254                 for (i = 0; i < assoc->bInterfaceCount; i++) {
255                         int intf = assoc->bFirstInterface + i;
256
257                         if (intf != ctrlif)
258                                 snd_usb_create_stream(chip, ctrlif, intf);
259                 }
260
261                 break;
262         }
263         }
264
265         return 0;
266 }
267
268 /*
269  * free the chip instance
270  *
271  * here we have to do not much, since pcm and controls are already freed
272  *
273  */
274
275 static int snd_usb_audio_free(struct snd_usb_audio *chip)
276 {
277         kfree(chip);
278         return 0;
279 }
280
281 static int snd_usb_audio_dev_free(struct snd_device *device)
282 {
283         struct snd_usb_audio *chip = device->device_data;
284         return snd_usb_audio_free(chip);
285 }
286
287 static void remove_trailing_spaces(char *str)
288 {
289         char *p;
290
291         if (!*str)
292                 return;
293         for (p = str + strlen(str) - 1; p >= str && isspace(*p); p--)
294                 *p = 0;
295 }
296
297 /*
298  * create a chip instance and set its names.
299  */
300 static int snd_usb_audio_create(struct usb_device *dev, int idx,
301                                 const struct snd_usb_audio_quirk *quirk,
302                                 struct snd_usb_audio **rchip)
303 {
304         struct snd_card *card;
305         struct snd_usb_audio *chip;
306         int err, len;
307         char component[14];
308         static struct snd_device_ops ops = {
309                 .dev_free =     snd_usb_audio_dev_free,
310         };
311
312         *rchip = NULL;
313
314         switch (snd_usb_get_speed(dev)) {
315         case USB_SPEED_LOW:
316         case USB_SPEED_FULL:
317         case USB_SPEED_HIGH:
318         case USB_SPEED_SUPER:
319                 break;
320         default:
321                 snd_printk(KERN_ERR "unknown device speed %d\n", snd_usb_get_speed(dev));
322                 return -ENXIO;
323         }
324
325         err = snd_card_create(index[idx], id[idx], THIS_MODULE, 0, &card);
326         if (err < 0) {
327                 snd_printk(KERN_ERR "cannot create card instance %d\n", idx);
328                 return err;
329         }
330
331         chip = kzalloc(sizeof(*chip), GFP_KERNEL);
332         if (! chip) {
333                 snd_card_free(card);
334                 return -ENOMEM;
335         }
336
337         mutex_init(&chip->shutdown_mutex);
338         chip->index = idx;
339         chip->dev = dev;
340         chip->card = card;
341         chip->setup = device_setup[idx];
342         chip->nrpacks = nrpacks;
343         chip->async_unlink = async_unlink;
344         chip->probing = 1;
345
346         chip->usb_id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
347                               le16_to_cpu(dev->descriptor.idProduct));
348         INIT_LIST_HEAD(&chip->pcm_list);
349         INIT_LIST_HEAD(&chip->midi_list);
350         INIT_LIST_HEAD(&chip->mixer_list);
351
352         if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) {
353                 snd_usb_audio_free(chip);
354                 snd_card_free(card);
355                 return err;
356         }
357
358         strcpy(card->driver, "USB-Audio");
359         sprintf(component, "USB%04x:%04x",
360                 USB_ID_VENDOR(chip->usb_id), USB_ID_PRODUCT(chip->usb_id));
361         snd_component_add(card, component);
362
363         /* retrieve the device string as shortname */
364         if (quirk && quirk->product_name && *quirk->product_name) {
365                 strlcpy(card->shortname, quirk->product_name, sizeof(card->shortname));
366         } else {
367                 if (!dev->descriptor.iProduct ||
368                     usb_string(dev, dev->descriptor.iProduct,
369                     card->shortname, sizeof(card->shortname)) <= 0) {
370                         /* no name available from anywhere, so use ID */
371                         sprintf(card->shortname, "USB Device %#04x:%#04x",
372                                 USB_ID_VENDOR(chip->usb_id),
373                                 USB_ID_PRODUCT(chip->usb_id));
374                 }
375         }
376         remove_trailing_spaces(card->shortname);
377
378         /* retrieve the vendor and device strings as longname */
379         if (quirk && quirk->vendor_name && *quirk->vendor_name) {
380                 len = strlcpy(card->longname, quirk->vendor_name, sizeof(card->longname));
381         } else {
382                 if (dev->descriptor.iManufacturer)
383                         len = usb_string(dev, dev->descriptor.iManufacturer,
384                                          card->longname, sizeof(card->longname));
385                 else
386                         len = 0;
387                 /* we don't really care if there isn't any vendor string */
388         }
389         if (len > 0) {
390                 remove_trailing_spaces(card->longname);
391                 if (*card->longname)
392                         strlcat(card->longname, " ", sizeof(card->longname));
393         }
394
395         strlcat(card->longname, card->shortname, sizeof(card->longname));
396
397         len = strlcat(card->longname, " at ", sizeof(card->longname));
398
399         if (len < sizeof(card->longname))
400                 usb_make_path(dev, card->longname + len, sizeof(card->longname) - len);
401
402         switch (snd_usb_get_speed(dev)) {
403         case USB_SPEED_LOW:
404                 strlcat(card->longname, ", low speed", sizeof(card->longname));
405                 break;
406         case USB_SPEED_FULL:
407                 strlcat(card->longname, ", full speed", sizeof(card->longname));
408                 break;
409         case USB_SPEED_HIGH:
410                 strlcat(card->longname, ", high speed", sizeof(card->longname));
411                 break;
412         case USB_SPEED_SUPER:
413                 strlcat(card->longname, ", super speed", sizeof(card->longname));
414                 break;
415         default:
416                 break;
417         }
418
419         snd_usb_audio_create_proc(chip);
420
421         *rchip = chip;
422         return 0;
423 }
424
425 /*
426  * probe the active usb device
427  *
428  * note that this can be called multiple times per a device, when it
429  * includes multiple audio control interfaces.
430  *
431  * thus we check the usb device pointer and creates the card instance
432  * only at the first time.  the successive calls of this function will
433  * append the pcm interface to the corresponding card.
434  */
435 static void *snd_usb_audio_probe(struct usb_device *dev,
436                                  struct usb_interface *intf,
437                                  const struct usb_device_id *usb_id)
438 {
439         const struct snd_usb_audio_quirk *quirk = (const struct snd_usb_audio_quirk *)usb_id->driver_info;
440         int i, err;
441         struct snd_usb_audio *chip;
442         struct usb_host_interface *alts;
443         int ifnum;
444         u32 id;
445
446         alts = &intf->altsetting[0];
447         ifnum = get_iface_desc(alts)->bInterfaceNumber;
448         id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
449                     le16_to_cpu(dev->descriptor.idProduct));
450         if (quirk && quirk->ifnum >= 0 && ifnum != quirk->ifnum)
451                 goto __err_val;
452
453         if (snd_usb_apply_boot_quirk(dev, intf, quirk) < 0)
454                 goto __err_val;
455
456         /*
457          * found a config.  now register to ALSA
458          */
459
460         /* check whether it's already registered */
461         chip = NULL;
462         mutex_lock(&register_mutex);
463         for (i = 0; i < SNDRV_CARDS; i++) {
464                 if (usb_chip[i] && usb_chip[i]->dev == dev) {
465                         if (usb_chip[i]->shutdown) {
466                                 snd_printk(KERN_ERR "USB device is in the shutdown state, cannot create a card instance\n");
467                                 goto __error;
468                         }
469                         chip = usb_chip[i];
470                         chip->probing = 1;
471                         break;
472                 }
473         }
474         if (! chip) {
475                 /* it's a fresh one.
476                  * now look for an empty slot and create a new card instance
477                  */
478                 for (i = 0; i < SNDRV_CARDS; i++)
479                         if (enable[i] && ! usb_chip[i] &&
480                             (vid[i] == -1 || vid[i] == USB_ID_VENDOR(id)) &&
481                             (pid[i] == -1 || pid[i] == USB_ID_PRODUCT(id))) {
482                                 if (snd_usb_audio_create(dev, i, quirk, &chip) < 0) {
483                                         goto __error;
484                                 }
485                                 snd_card_set_dev(chip->card, &intf->dev);
486                                 chip->pm_intf = intf;
487                                 break;
488                         }
489                 if (!chip) {
490                         printk(KERN_ERR "no available usb audio device\n");
491                         goto __error;
492                 }
493         }
494
495         chip->txfr_quirk = 0;
496         err = 1; /* continue */
497         if (quirk && quirk->ifnum != QUIRK_NO_INTERFACE) {
498                 /* need some special handlings */
499                 if ((err = snd_usb_create_quirk(chip, intf, &usb_audio_driver, quirk)) < 0)
500                         goto __error;
501         }
502
503         /*
504          * For devices with more than one control interface, we assume the
505          * first contains the audio controls. We might need a more specific
506          * check here in the future.
507          */
508         if (!chip->ctrl_intf)
509                 chip->ctrl_intf = alts;
510
511         if (err > 0) {
512                 /* create normal USB audio interfaces */
513                 if (snd_usb_create_streams(chip, ifnum) < 0 ||
514                     snd_usb_create_mixer(chip, ifnum, ignore_ctl_error) < 0) {
515                         goto __error;
516                 }
517         }
518
519         /* we are allowed to call snd_card_register() many times */
520         if (snd_card_register(chip->card) < 0) {
521                 goto __error;
522         }
523
524         usb_chip[chip->index] = chip;
525         chip->num_interfaces++;
526         chip->probing = 0;
527         mutex_unlock(&register_mutex);
528         return chip;
529
530  __error:
531         if (chip && !chip->num_interfaces)
532                 snd_card_free(chip->card);
533         mutex_unlock(&register_mutex);
534  __err_val:
535         return NULL;
536 }
537
538 /*
539  * we need to take care of counter, since disconnection can be called also
540  * many times as well as usb_audio_probe().
541  */
542 static void snd_usb_audio_disconnect(struct usb_device *dev, void *ptr)
543 {
544         struct snd_usb_audio *chip;
545         struct snd_card *card;
546         struct list_head *p;
547
548         if (ptr == (void *)-1L)
549                 return;
550
551         chip = ptr;
552         card = chip->card;
553         mutex_lock(&register_mutex);
554         mutex_lock(&chip->shutdown_mutex);
555         chip->shutdown = 1;
556         chip->num_interfaces--;
557         if (chip->num_interfaces <= 0) {
558                 snd_card_disconnect(card);
559                 /* release the pcm resources */
560                 list_for_each(p, &chip->pcm_list) {
561                         snd_usb_stream_disconnect(p);
562                 }
563                 /* release the midi resources */
564                 list_for_each(p, &chip->midi_list) {
565                         snd_usbmidi_disconnect(p);
566                 }
567                 /* release mixer resources */
568                 list_for_each(p, &chip->mixer_list) {
569                         snd_usb_mixer_disconnect(p);
570                 }
571                 usb_chip[chip->index] = NULL;
572                 mutex_unlock(&chip->shutdown_mutex);
573                 mutex_unlock(&register_mutex);
574                 snd_card_free_when_closed(card);
575         } else {
576                 mutex_unlock(&chip->shutdown_mutex);
577                 mutex_unlock(&register_mutex);
578         }
579 }
580
581 /*
582  * new 2.5 USB kernel API
583  */
584 static int usb_audio_probe(struct usb_interface *intf,
585                            const struct usb_device_id *id)
586 {
587         void *chip;
588         chip = snd_usb_audio_probe(interface_to_usbdev(intf), intf, id);
589         if (chip) {
590                 usb_set_intfdata(intf, chip);
591                 return 0;
592         } else
593                 return -EIO;
594 }
595
596 static void usb_audio_disconnect(struct usb_interface *intf)
597 {
598         snd_usb_audio_disconnect(interface_to_usbdev(intf),
599                                  usb_get_intfdata(intf));
600 }
601
602 #ifdef CONFIG_PM
603
604 int snd_usb_autoresume(struct snd_usb_audio *chip)
605 {
606         int err = -ENODEV;
607
608         if (!chip->shutdown && !chip->probing)
609                 err = usb_autopm_get_interface(chip->pm_intf);
610
611         return err;
612 }
613
614 void snd_usb_autosuspend(struct snd_usb_audio *chip)
615 {
616         if (!chip->shutdown && !chip->probing)
617                 usb_autopm_put_interface(chip->pm_intf);
618 }
619
620 static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message)
621 {
622         struct snd_usb_audio *chip = usb_get_intfdata(intf);
623         struct list_head *p;
624         struct snd_usb_stream *as;
625         struct usb_mixer_interface *mixer;
626
627         if (chip == (void *)-1L)
628                 return 0;
629
630         if (!(message.event & PM_EVENT_AUTO)) {
631                 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot);
632                 if (!chip->num_suspended_intf++) {
633                         list_for_each(p, &chip->pcm_list) {
634                                 as = list_entry(p, struct snd_usb_stream, list);
635                                 snd_pcm_suspend_all(as->pcm);
636                         }
637                 }
638         } else {
639                 /*
640                  * otherwise we keep the rest of the system in the dark
641                  * to keep this transparent
642                  */
643                 if (!chip->num_suspended_intf++)
644                         chip->autosuspended = 1;
645         }
646
647         list_for_each_entry(mixer, &chip->mixer_list, list)
648                 snd_usb_mixer_inactivate(mixer);
649
650         return 0;
651 }
652
653 static int usb_audio_resume(struct usb_interface *intf)
654 {
655         struct snd_usb_audio *chip = usb_get_intfdata(intf);
656         struct usb_mixer_interface *mixer;
657         int err = 0;
658
659         if (chip == (void *)-1L)
660                 return 0;
661         if (--chip->num_suspended_intf)
662                 return 0;
663         /*
664          * ALSA leaves material resumption to user space
665          * we just notify and restart the mixers
666          */
667         list_for_each_entry(mixer, &chip->mixer_list, list) {
668                 err = snd_usb_mixer_activate(mixer);
669                 if (err < 0)
670                         goto err_out;
671         }
672
673         if (!chip->autosuspended)
674                 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0);
675         chip->autosuspended = 0;
676
677 err_out:
678         return err;
679 }
680 #else
681 #define usb_audio_suspend       NULL
682 #define usb_audio_resume        NULL
683 #endif          /* CONFIG_PM */
684
685 static struct usb_device_id usb_audio_ids [] = {
686 #include "quirks-table.h"
687     { .match_flags = (USB_DEVICE_ID_MATCH_INT_CLASS | USB_DEVICE_ID_MATCH_INT_SUBCLASS),
688       .bInterfaceClass = USB_CLASS_AUDIO,
689       .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL },
690     { }                                         /* Terminating entry */
691 };
692
693 MODULE_DEVICE_TABLE (usb, usb_audio_ids);
694
695 /*
696  * entry point for linux usb interface
697  */
698
699 static struct usb_driver usb_audio_driver = {
700         .name =         "snd-usb-audio",
701         .probe =        usb_audio_probe,
702         .disconnect =   usb_audio_disconnect,
703         .suspend =      usb_audio_suspend,
704         .resume =       usb_audio_resume,
705         .id_table =     usb_audio_ids,
706         .supports_autosuspend = 1,
707 };
708
709 static int __init snd_usb_audio_init(void)
710 {
711         if (nrpacks < 1 || nrpacks > MAX_PACKS) {
712                 printk(KERN_WARNING "invalid nrpacks value.\n");
713                 return -EINVAL;
714         }
715         return usb_register(&usb_audio_driver);
716 }
717
718 static void __exit snd_usb_audio_cleanup(void)
719 {
720         usb_deregister(&usb_audio_driver);
721 }
722
723 module_init(snd_usb_audio_init);
724 module_exit(snd_usb_audio_cleanup);