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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#include <linux/module.h>
51
52#include <sound/control.h>
53#include <sound/core.h>
54#include <sound/info.h>
55#include <sound/pcm.h>
56#include <sound/pcm_params.h>
57#include <sound/initval.h>
58
59#include "usbaudio.h"
60#include "card.h"
61#include "midi.h"
62#include "mixer.h"
63#include "proc.h"
64#include "quirks.h"
65#include "endpoint.h"
66#include "helper.h"
67#include "debug.h"
68#include "pcm.h"
69#include "format.h"
70#include "power.h"
71#include "stream.h"
72
73MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
74MODULE_DESCRIPTION("USB Audio");
75MODULE_LICENSE("GPL");
76MODULE_SUPPORTED_DEVICE("{{Generic,USB Audio}}");
77
78
79static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */
80static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */
81static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;/* Enable this card */
82/* Vendor/product IDs for this card */
83static int vid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 };
84static int pid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 };
85static int nrpacks = 8; /* max. number of packets per urb */
86static bool async_unlink = 1;
87static int device_setup[SNDRV_CARDS]; /* device parameter for this card */
88static bool ignore_ctl_error;
89
90module_param_array(index, int, NULL, 0444);
91MODULE_PARM_DESC(index, "Index value for the USB audio adapter.");
92module_param_array(id, charp, NULL, 0444);
93MODULE_PARM_DESC(id, "ID string for the USB audio adapter.");
94module_param_array(enable, bool, NULL, 0444);
95MODULE_PARM_DESC(enable, "Enable USB audio adapter.");
96module_param_array(vid, int, NULL, 0444);
97MODULE_PARM_DESC(vid, "Vendor ID for the USB audio device.");
98module_param_array(pid, int, NULL, 0444);
99MODULE_PARM_DESC(pid, "Product ID for the USB audio device.");
100module_param(nrpacks, int, 0644);
101MODULE_PARM_DESC(nrpacks, "Max. number of packets per URB.");
102module_param(async_unlink, bool, 0444);
103MODULE_PARM_DESC(async_unlink, "Use async unlink mode.");
104module_param_array(device_setup, int, NULL, 0444);
105MODULE_PARM_DESC(device_setup, "Specific device setup (if needed).");
106module_param(ignore_ctl_error, bool, 0444);
107MODULE_PARM_DESC(ignore_ctl_error,
108 "Ignore errors from USB controller for mixer interfaces.");
109
110/*
111 * we keep the snd_usb_audio_t instances by ourselves for merging
112 * the all interfaces on the same card as one sound device.
113 */
114
115static DEFINE_MUTEX(register_mutex);
116static struct snd_usb_audio *usb_chip[SNDRV_CARDS];
117static struct usb_driver usb_audio_driver;
118
119/*
120 * disconnect streams
121 * called from snd_usb_audio_disconnect()
122 */
123static void snd_usb_stream_disconnect(struct list_head *head)
124{
125 int idx;
126 struct snd_usb_stream *as;
127 struct snd_usb_substream *subs;
128
129 as = list_entry(head, struct snd_usb_stream, list);
130 for (idx = 0; idx < 2; idx++) {
131 subs = &as->substream[idx];
132 if (!subs->num_formats)
133 continue;
134 subs->interface = -1;
135 subs->data_endpoint = NULL;
136 subs->sync_endpoint = NULL;
137 }
138}
139
140static int snd_usb_create_stream(struct snd_usb_audio *chip, int ctrlif, int interface)
141{
142 struct usb_device *dev = chip->dev;
143 struct usb_host_interface *alts;
144 struct usb_interface_descriptor *altsd;
145 struct usb_interface *iface = usb_ifnum_to_if(dev, interface);
146
147 if (!iface) {
148 snd_printk(KERN_ERR "%d:%u:%d : does not exist\n",
149 dev->devnum, ctrlif, interface);
150 return -EINVAL;
151 }
152
153 if (usb_interface_claimed(iface)) {
154 snd_printdd(KERN_INFO "%d:%d:%d: skipping, already claimed\n",
155 dev->devnum, ctrlif, interface);
156 return -EINVAL;
157 }
158
159 alts = &iface->altsetting[0];
160 altsd = get_iface_desc(alts);
161 if ((altsd->bInterfaceClass == USB_CLASS_AUDIO ||
162 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC) &&
163 altsd->bInterfaceSubClass == USB_SUBCLASS_MIDISTREAMING) {
164 int err = snd_usbmidi_create(chip->card, iface,
165 &chip->midi_list, NULL);
166 if (err < 0) {
167 snd_printk(KERN_ERR "%d:%u:%d: cannot create sequencer device\n",
168 dev->devnum, ctrlif, interface);
169 return -EINVAL;
170 }
171 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L);
172
173 return 0;
174 }
175
176 if ((altsd->bInterfaceClass != USB_CLASS_AUDIO &&
177 altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
178 altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING) {
179 snd_printdd(KERN_ERR "%d:%u:%d: skipping non-supported interface %d\n",
180 dev->devnum, ctrlif, interface, altsd->bInterfaceClass);
181 /* skip non-supported classes */
182 return -EINVAL;
183 }
184
185 if (snd_usb_get_speed(dev) == USB_SPEED_LOW) {
186 snd_printk(KERN_ERR "low speed audio streaming not supported\n");
187 return -EINVAL;
188 }
189
190 if (! snd_usb_parse_audio_interface(chip, interface)) {
191 usb_set_interface(dev, interface, 0); /* reset the current interface */
192 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L);
193 return -EINVAL;
194 }
195
196 return 0;
197}
198
199/*
200 * parse audio control descriptor and create pcm/midi streams
201 */
202static int snd_usb_create_streams(struct snd_usb_audio *chip, int ctrlif)
203{
204 struct usb_device *dev = chip->dev;
205 struct usb_host_interface *host_iface;
206 struct usb_interface_descriptor *altsd;
207 void *control_header;
208 int i, protocol;
209
210 /* find audiocontrol interface */
211 host_iface = &usb_ifnum_to_if(dev, ctrlif)->altsetting[0];
212 control_header = snd_usb_find_csint_desc(host_iface->extra,
213 host_iface->extralen,
214 NULL, UAC_HEADER);
215 altsd = get_iface_desc(host_iface);
216 protocol = altsd->bInterfaceProtocol;
217
218 if (!control_header) {
219 snd_printk(KERN_ERR "cannot find UAC_HEADER\n");
220 return -EINVAL;
221 }
222
223 switch (protocol) {
224 default:
225 snd_printdd(KERN_WARNING "unknown interface protocol %#02x, assuming v1\n",
226 protocol);
227 /* fall through */
228
229 case UAC_VERSION_1: {
230 struct uac1_ac_header_descriptor *h1 = control_header;
231
232 if (!h1->bInCollection) {
233 snd_printk(KERN_INFO "skipping empty audio interface (v1)\n");
234 return -EINVAL;
235 }
236
237 if (h1->bLength < sizeof(*h1) + h1->bInCollection) {
238 snd_printk(KERN_ERR "invalid UAC_HEADER (v1)\n");
239 return -EINVAL;
240 }
241
242 for (i = 0; i < h1->bInCollection; i++)
243 snd_usb_create_stream(chip, ctrlif, h1->baInterfaceNr[i]);
244
245 break;
246 }
247
248 case UAC_VERSION_2: {
249 struct usb_interface_assoc_descriptor *assoc =
250 usb_ifnum_to_if(dev, ctrlif)->intf_assoc;
251
252 if (!assoc) {
253 snd_printk(KERN_ERR "Audio class v2 interfaces need an interface association\n");
254 return -EINVAL;
255 }
256
257 for (i = 0; i < assoc->bInterfaceCount; i++) {
258 int intf = assoc->bFirstInterface + i;
259
260 if (intf != ctrlif)
261 snd_usb_create_stream(chip, ctrlif, intf);
262 }
263
264 break;
265 }
266 }
267
268 return 0;
269}
270
271/*
272 * free the chip instance
273 *
274 * here we have to do not much, since pcm and controls are already freed
275 *
276 */
277
278static int snd_usb_audio_free(struct snd_usb_audio *chip)
279{
280 mutex_destroy(&chip->mutex);
281 kfree(chip);
282 return 0;
283}
284
285static int snd_usb_audio_dev_free(struct snd_device *device)
286{
287 struct snd_usb_audio *chip = device->device_data;
288 return snd_usb_audio_free(chip);
289}
290
291static void remove_trailing_spaces(char *str)
292{
293 char *p;
294
295 if (!*str)
296 return;
297 for (p = str + strlen(str) - 1; p >= str && isspace(*p); p--)
298 *p = 0;
299}
300
301/*
302 * create a chip instance and set its names.
303 */
304static int snd_usb_audio_create(struct usb_device *dev, int idx,
305 const struct snd_usb_audio_quirk *quirk,
306 struct snd_usb_audio **rchip)
307{
308 struct snd_card *card;
309 struct snd_usb_audio *chip;
310 int err, len;
311 char component[14];
312 static struct snd_device_ops ops = {
313 .dev_free = snd_usb_audio_dev_free,
314 };
315
316 *rchip = NULL;
317
318 switch (snd_usb_get_speed(dev)) {
319 case USB_SPEED_LOW:
320 case USB_SPEED_FULL:
321 case USB_SPEED_HIGH:
322 case USB_SPEED_SUPER:
323 break;
324 default:
325 snd_printk(KERN_ERR "unknown device speed %d\n", snd_usb_get_speed(dev));
326 return -ENXIO;
327 }
328
329 err = snd_card_create(index[idx], id[idx], THIS_MODULE, 0, &card);
330 if (err < 0) {
331 snd_printk(KERN_ERR "cannot create card instance %d\n", idx);
332 return err;
333 }
334
335 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
336 if (! chip) {
337 snd_card_free(card);
338 return -ENOMEM;
339 }
340
341 mutex_init(&chip->mutex);
342 mutex_init(&chip->shutdown_mutex);
343 chip->index = idx;
344 chip->dev = dev;
345 chip->card = card;
346 chip->setup = device_setup[idx];
347 chip->nrpacks = nrpacks;
348 chip->async_unlink = async_unlink;
349 chip->probing = 1;
350
351 chip->usb_id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
352 le16_to_cpu(dev->descriptor.idProduct));
353 INIT_LIST_HEAD(&chip->pcm_list);
354 INIT_LIST_HEAD(&chip->ep_list);
355 INIT_LIST_HEAD(&chip->midi_list);
356 INIT_LIST_HEAD(&chip->mixer_list);
357
358 if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) {
359 snd_usb_audio_free(chip);
360 snd_card_free(card);
361 return err;
362 }
363
364 strcpy(card->driver, "USB-Audio");
365 sprintf(component, "USB%04x:%04x",
366 USB_ID_VENDOR(chip->usb_id), USB_ID_PRODUCT(chip->usb_id));
367 snd_component_add(card, component);
368
369 /* retrieve the device string as shortname */
370 if (quirk && quirk->product_name && *quirk->product_name) {
371 strlcpy(card->shortname, quirk->product_name, sizeof(card->shortname));
372 } else {
373 if (!dev->descriptor.iProduct ||
374 usb_string(dev, dev->descriptor.iProduct,
375 card->shortname, sizeof(card->shortname)) <= 0) {
376 /* no name available from anywhere, so use ID */
377 sprintf(card->shortname, "USB Device %#04x:%#04x",
378 USB_ID_VENDOR(chip->usb_id),
379 USB_ID_PRODUCT(chip->usb_id));
380 }
381 }
382 remove_trailing_spaces(card->shortname);
383
384 /* retrieve the vendor and device strings as longname */
385 if (quirk && quirk->vendor_name && *quirk->vendor_name) {
386 len = strlcpy(card->longname, quirk->vendor_name, sizeof(card->longname));
387 } else {
388 if (dev->descriptor.iManufacturer)
389 len = usb_string(dev, dev->descriptor.iManufacturer,
390 card->longname, sizeof(card->longname));
391 else
392 len = 0;
393 /* we don't really care if there isn't any vendor string */
394 }
395 if (len > 0) {
396 remove_trailing_spaces(card->longname);
397 if (*card->longname)
398 strlcat(card->longname, " ", sizeof(card->longname));
399 }
400
401 strlcat(card->longname, card->shortname, sizeof(card->longname));
402
403 len = strlcat(card->longname, " at ", sizeof(card->longname));
404
405 if (len < sizeof(card->longname))
406 usb_make_path(dev, card->longname + len, sizeof(card->longname) - len);
407
408 switch (snd_usb_get_speed(dev)) {
409 case USB_SPEED_LOW:
410 strlcat(card->longname, ", low speed", sizeof(card->longname));
411 break;
412 case USB_SPEED_FULL:
413 strlcat(card->longname, ", full speed", sizeof(card->longname));
414 break;
415 case USB_SPEED_HIGH:
416 strlcat(card->longname, ", high speed", sizeof(card->longname));
417 break;
418 case USB_SPEED_SUPER:
419 strlcat(card->longname, ", super speed", sizeof(card->longname));
420 break;
421 default:
422 break;
423 }
424
425 snd_usb_audio_create_proc(chip);
426
427 *rchip = chip;
428 return 0;
429}
430
431/*
432 * probe the active usb device
433 *
434 * note that this can be called multiple times per a device, when it
435 * includes multiple audio control interfaces.
436 *
437 * thus we check the usb device pointer and creates the card instance
438 * only at the first time. the successive calls of this function will
439 * append the pcm interface to the corresponding card.
440 */
441static struct snd_usb_audio *
442snd_usb_audio_probe(struct usb_device *dev,
443 struct usb_interface *intf,
444 const struct usb_device_id *usb_id)
445{
446 const struct snd_usb_audio_quirk *quirk = (const struct snd_usb_audio_quirk *)usb_id->driver_info;
447 int i, err;
448 struct snd_usb_audio *chip;
449 struct usb_host_interface *alts;
450 int ifnum;
451 u32 id;
452
453 alts = &intf->altsetting[0];
454 ifnum = get_iface_desc(alts)->bInterfaceNumber;
455 id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
456 le16_to_cpu(dev->descriptor.idProduct));
457 if (quirk && quirk->ifnum >= 0 && ifnum != quirk->ifnum)
458 goto __err_val;
459
460 if (snd_usb_apply_boot_quirk(dev, intf, quirk) < 0)
461 goto __err_val;
462
463 /*
464 * found a config. now register to ALSA
465 */
466
467 /* check whether it's already registered */
468 chip = NULL;
469 mutex_lock(®ister_mutex);
470 for (i = 0; i < SNDRV_CARDS; i++) {
471 if (usb_chip[i] && usb_chip[i]->dev == dev) {
472 if (usb_chip[i]->shutdown) {
473 snd_printk(KERN_ERR "USB device is in the shutdown state, cannot create a card instance\n");
474 goto __error;
475 }
476 chip = usb_chip[i];
477 chip->probing = 1;
478 break;
479 }
480 }
481 if (! chip) {
482 /* it's a fresh one.
483 * now look for an empty slot and create a new card instance
484 */
485 for (i = 0; i < SNDRV_CARDS; i++)
486 if (enable[i] && ! usb_chip[i] &&
487 (vid[i] == -1 || vid[i] == USB_ID_VENDOR(id)) &&
488 (pid[i] == -1 || pid[i] == USB_ID_PRODUCT(id))) {
489 if (snd_usb_audio_create(dev, i, quirk, &chip) < 0) {
490 goto __error;
491 }
492 snd_card_set_dev(chip->card, &intf->dev);
493 chip->pm_intf = intf;
494 break;
495 }
496 if (!chip) {
497 printk(KERN_ERR "no available usb audio device\n");
498 goto __error;
499 }
500 }
501
502 /*
503 * For devices with more than one control interface, we assume the
504 * first contains the audio controls. We might need a more specific
505 * check here in the future.
506 */
507 if (!chip->ctrl_intf)
508 chip->ctrl_intf = alts;
509
510 chip->txfr_quirk = 0;
511 err = 1; /* continue */
512 if (quirk && quirk->ifnum != QUIRK_NO_INTERFACE) {
513 /* need some special handlings */
514 if ((err = snd_usb_create_quirk(chip, intf, &usb_audio_driver, quirk)) < 0)
515 goto __error;
516 }
517
518 if (err > 0) {
519 /* create normal USB audio interfaces */
520 if (snd_usb_create_streams(chip, ifnum) < 0 ||
521 snd_usb_create_mixer(chip, ifnum, ignore_ctl_error) < 0) {
522 goto __error;
523 }
524 }
525
526 /* we are allowed to call snd_card_register() many times */
527 if (snd_card_register(chip->card) < 0) {
528 goto __error;
529 }
530
531 usb_chip[chip->index] = chip;
532 chip->num_interfaces++;
533 chip->probing = 0;
534 mutex_unlock(®ister_mutex);
535 return chip;
536
537 __error:
538 if (chip) {
539 if (!chip->num_interfaces)
540 snd_card_free(chip->card);
541 chip->probing = 0;
542 }
543 mutex_unlock(®ister_mutex);
544 __err_val:
545 return NULL;
546}
547
548/*
549 * we need to take care of counter, since disconnection can be called also
550 * many times as well as usb_audio_probe().
551 */
552static void snd_usb_audio_disconnect(struct usb_device *dev,
553 struct snd_usb_audio *chip)
554{
555 struct snd_card *card;
556 struct list_head *p, *n;
557
558 if (chip == (void *)-1L)
559 return;
560
561 card = chip->card;
562 mutex_lock(®ister_mutex);
563 mutex_lock(&chip->shutdown_mutex);
564 chip->shutdown = 1;
565 chip->num_interfaces--;
566 if (chip->num_interfaces <= 0) {
567 snd_card_disconnect(card);
568 /* release the pcm resources */
569 list_for_each(p, &chip->pcm_list) {
570 snd_usb_stream_disconnect(p);
571 }
572 /* release the endpoint resources */
573 list_for_each_safe(p, n, &chip->ep_list) {
574 snd_usb_endpoint_free(p);
575 }
576 /* release the midi resources */
577 list_for_each(p, &chip->midi_list) {
578 snd_usbmidi_disconnect(p);
579 }
580 /* release mixer resources */
581 list_for_each(p, &chip->mixer_list) {
582 snd_usb_mixer_disconnect(p);
583 }
584 usb_chip[chip->index] = NULL;
585 mutex_unlock(&chip->shutdown_mutex);
586 mutex_unlock(®ister_mutex);
587 snd_card_free_when_closed(card);
588 } else {
589 mutex_unlock(&chip->shutdown_mutex);
590 mutex_unlock(®ister_mutex);
591 }
592}
593
594/*
595 * new 2.5 USB kernel API
596 */
597static int usb_audio_probe(struct usb_interface *intf,
598 const struct usb_device_id *id)
599{
600 struct snd_usb_audio *chip;
601 chip = snd_usb_audio_probe(interface_to_usbdev(intf), intf, id);
602 if (chip) {
603 usb_set_intfdata(intf, chip);
604 return 0;
605 } else
606 return -EIO;
607}
608
609static void usb_audio_disconnect(struct usb_interface *intf)
610{
611 snd_usb_audio_disconnect(interface_to_usbdev(intf),
612 usb_get_intfdata(intf));
613}
614
615#ifdef CONFIG_PM
616
617int snd_usb_autoresume(struct snd_usb_audio *chip)
618{
619 int err = -ENODEV;
620
621 if (!chip->shutdown && !chip->probing)
622 err = usb_autopm_get_interface(chip->pm_intf);
623
624 return err;
625}
626
627void snd_usb_autosuspend(struct snd_usb_audio *chip)
628{
629 if (!chip->shutdown && !chip->probing)
630 usb_autopm_put_interface(chip->pm_intf);
631}
632
633static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message)
634{
635 struct snd_usb_audio *chip = usb_get_intfdata(intf);
636 struct list_head *p;
637 struct snd_usb_stream *as;
638 struct usb_mixer_interface *mixer;
639
640 if (chip == (void *)-1L)
641 return 0;
642
643 if (!PMSG_IS_AUTO(message)) {
644 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot);
645 if (!chip->num_suspended_intf++) {
646 list_for_each(p, &chip->pcm_list) {
647 as = list_entry(p, struct snd_usb_stream, list);
648 snd_pcm_suspend_all(as->pcm);
649 }
650 }
651 } else {
652 /*
653 * otherwise we keep the rest of the system in the dark
654 * to keep this transparent
655 */
656 if (!chip->num_suspended_intf++)
657 chip->autosuspended = 1;
658 }
659
660 list_for_each_entry(mixer, &chip->mixer_list, list)
661 snd_usb_mixer_inactivate(mixer);
662
663 return 0;
664}
665
666static int usb_audio_resume(struct usb_interface *intf)
667{
668 struct snd_usb_audio *chip = usb_get_intfdata(intf);
669 struct usb_mixer_interface *mixer;
670 int err = 0;
671
672 if (chip == (void *)-1L)
673 return 0;
674 if (--chip->num_suspended_intf)
675 return 0;
676 /*
677 * ALSA leaves material resumption to user space
678 * we just notify and restart the mixers
679 */
680 list_for_each_entry(mixer, &chip->mixer_list, list) {
681 err = snd_usb_mixer_activate(mixer);
682 if (err < 0)
683 goto err_out;
684 }
685
686 if (!chip->autosuspended)
687 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0);
688 chip->autosuspended = 0;
689
690err_out:
691 return err;
692}
693#else
694#define usb_audio_suspend NULL
695#define usb_audio_resume NULL
696#endif /* CONFIG_PM */
697
698static struct usb_device_id usb_audio_ids [] = {
699#include "quirks-table.h"
700 { .match_flags = (USB_DEVICE_ID_MATCH_INT_CLASS | USB_DEVICE_ID_MATCH_INT_SUBCLASS),
701 .bInterfaceClass = USB_CLASS_AUDIO,
702 .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL },
703 { } /* Terminating entry */
704};
705
706MODULE_DEVICE_TABLE (usb, usb_audio_ids);
707
708/*
709 * entry point for linux usb interface
710 */
711
712static struct usb_driver usb_audio_driver = {
713 .name = "snd-usb-audio",
714 .probe = usb_audio_probe,
715 .disconnect = usb_audio_disconnect,
716 .suspend = usb_audio_suspend,
717 .resume = usb_audio_resume,
718 .id_table = usb_audio_ids,
719 .supports_autosuspend = 1,
720};
721
722static int __init snd_usb_audio_init(void)
723{
724 if (nrpacks < 1 || nrpacks > MAX_PACKS) {
725 printk(KERN_WARNING "invalid nrpacks value.\n");
726 return -EINVAL;
727 }
728 return usb_register(&usb_audio_driver);
729}
730
731static void __exit snd_usb_audio_cleanup(void)
732{
733 usb_deregister(&usb_audio_driver);
734}
735
736module_init(snd_usb_audio_init);
737module_exit(snd_usb_audio_cleanup);