blob: c0f8270bc199e9e91a82cef451d1aa63ead9eb15 [file] [log] [blame]
Daniel Macke5779992010-03-04 19:46:13 +01001/*
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/usb.h>
45#include <linux/moduleparam.h>
46#include <linux/mutex.h>
47#include <linux/usb/audio.h>
Daniel Mack7e847892010-03-11 21:13:20 +010048#include <linux/usb/audio-v2.h>
Daniel Macke5779992010-03-04 19:46:13 +010049
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"
Daniel Mackf0b5e632010-03-11 21:13:23 +010059#include "mixer.h"
Daniel Macke5779992010-03-04 19:46:13 +010060#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 "urb.h"
67#include "format.h"
68
69MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
70MODULE_DESCRIPTION("USB Audio");
71MODULE_LICENSE("GPL");
72MODULE_SUPPORTED_DEVICE("{{Generic,USB Audio}}");
73
74
75static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */
76static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */
77static int enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;/* Enable this card */
78/* Vendor/product IDs for this card */
79static int vid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 };
80static int pid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 };
81static int nrpacks = 8; /* max. number of packets per urb */
82static int async_unlink = 1;
83static int device_setup[SNDRV_CARDS]; /* device parameter for this card */
84static int ignore_ctl_error;
85
86module_param_array(index, int, NULL, 0444);
87MODULE_PARM_DESC(index, "Index value for the USB audio adapter.");
88module_param_array(id, charp, NULL, 0444);
89MODULE_PARM_DESC(id, "ID string for the USB audio adapter.");
90module_param_array(enable, bool, NULL, 0444);
91MODULE_PARM_DESC(enable, "Enable USB audio adapter.");
92module_param_array(vid, int, NULL, 0444);
93MODULE_PARM_DESC(vid, "Vendor ID for the USB audio device.");
94module_param_array(pid, int, NULL, 0444);
95MODULE_PARM_DESC(pid, "Product ID for the USB audio device.");
96module_param(nrpacks, int, 0644);
97MODULE_PARM_DESC(nrpacks, "Max. number of packets per URB.");
98module_param(async_unlink, bool, 0444);
99MODULE_PARM_DESC(async_unlink, "Use async unlink mode.");
100module_param_array(device_setup, int, NULL, 0444);
101MODULE_PARM_DESC(device_setup, "Specific device setup (if needed).");
102module_param(ignore_ctl_error, bool, 0444);
103MODULE_PARM_DESC(ignore_ctl_error,
104 "Ignore errors from USB controller for mixer interfaces.");
105
106/*
107 * we keep the snd_usb_audio_t instances by ourselves for merging
108 * the all interfaces on the same card as one sound device.
109 */
110
111static DEFINE_MUTEX(register_mutex);
112static struct snd_usb_audio *usb_chip[SNDRV_CARDS];
113static struct usb_driver usb_audio_driver;
114
115/*
116 * disconnect streams
117 * called from snd_usb_audio_disconnect()
118 */
119static void snd_usb_stream_disconnect(struct list_head *head)
120{
121 int idx;
122 struct snd_usb_stream *as;
123 struct snd_usb_substream *subs;
124
125 as = list_entry(head, struct snd_usb_stream, list);
126 for (idx = 0; idx < 2; idx++) {
127 subs = &as->substream[idx];
128 if (!subs->num_formats)
Takashi Iwai76195fb2010-09-08 08:27:02 +0200129 continue;
Daniel Macke5779992010-03-04 19:46:13 +0100130 snd_usb_release_substream_urbs(subs, 1);
131 subs->interface = -1;
132 }
133}
134
135static int snd_usb_create_stream(struct snd_usb_audio *chip, int ctrlif, int interface)
136{
137 struct usb_device *dev = chip->dev;
138 struct usb_host_interface *alts;
139 struct usb_interface_descriptor *altsd;
140 struct usb_interface *iface = usb_ifnum_to_if(dev, interface);
141
142 if (!iface) {
143 snd_printk(KERN_ERR "%d:%u:%d : does not exist\n",
144 dev->devnum, ctrlif, interface);
145 return -EINVAL;
146 }
147
148 if (usb_interface_claimed(iface)) {
149 snd_printdd(KERN_INFO "%d:%d:%d: skipping, already claimed\n",
150 dev->devnum, ctrlif, interface);
151 return -EINVAL;
152 }
153
154 alts = &iface->altsetting[0];
155 altsd = get_iface_desc(alts);
156 if ((altsd->bInterfaceClass == USB_CLASS_AUDIO ||
157 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC) &&
158 altsd->bInterfaceSubClass == USB_SUBCLASS_MIDISTREAMING) {
159 int err = snd_usbmidi_create(chip->card, iface,
160 &chip->midi_list, NULL);
161 if (err < 0) {
162 snd_printk(KERN_ERR "%d:%u:%d: cannot create sequencer device\n",
163 dev->devnum, ctrlif, interface);
164 return -EINVAL;
165 }
166 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L);
167
168 return 0;
169 }
170
171 if ((altsd->bInterfaceClass != USB_CLASS_AUDIO &&
172 altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
173 altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING) {
174 snd_printdd(KERN_ERR "%d:%u:%d: skipping non-supported interface %d\n",
175 dev->devnum, ctrlif, interface, altsd->bInterfaceClass);
176 /* skip non-supported classes */
177 return -EINVAL;
178 }
179
180 if (snd_usb_get_speed(dev) == USB_SPEED_LOW) {
181 snd_printk(KERN_ERR "low speed audio streaming not supported\n");
182 return -EINVAL;
183 }
184
185 if (! snd_usb_parse_audio_endpoints(chip, interface)) {
186 usb_set_interface(dev, interface, 0); /* reset the current interface */
187 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L);
188 return -EINVAL;
189 }
190
191 return 0;
192}
193
194/*
195 * parse audio control descriptor and create pcm/midi streams
196 */
197static int snd_usb_create_streams(struct snd_usb_audio *chip, int ctrlif)
198{
199 struct usb_device *dev = chip->dev;
200 struct usb_host_interface *host_iface;
201 struct usb_interface_descriptor *altsd;
202 void *control_header;
203 int i, protocol;
204
205 /* find audiocontrol interface */
206 host_iface = &usb_ifnum_to_if(dev, ctrlif)->altsetting[0];
207 control_header = snd_usb_find_csint_desc(host_iface->extra,
208 host_iface->extralen,
209 NULL, UAC_HEADER);
210 altsd = get_iface_desc(host_iface);
211 protocol = altsd->bInterfaceProtocol;
212
213 if (!control_header) {
214 snd_printk(KERN_ERR "cannot find UAC_HEADER\n");
215 return -EINVAL;
216 }
217
218 switch (protocol) {
Clemens Ladischa2acad82010-09-03 10:53:11 +0200219 default:
220 snd_printdd(KERN_WARNING "unknown interface protocol %#02x, assuming v1\n",
221 protocol);
222 /* fall through */
223
Daniel Macke5779992010-03-04 19:46:13 +0100224 case UAC_VERSION_1: {
Daniel Mack69da9bc2010-06-16 17:57:28 +0200225 struct uac1_ac_header_descriptor *h1 = control_header;
Daniel Macke5779992010-03-04 19:46:13 +0100226
227 if (!h1->bInCollection) {
228 snd_printk(KERN_INFO "skipping empty audio interface (v1)\n");
229 return -EINVAL;
230 }
231
232 if (h1->bLength < sizeof(*h1) + h1->bInCollection) {
233 snd_printk(KERN_ERR "invalid UAC_HEADER (v1)\n");
234 return -EINVAL;
235 }
236
237 for (i = 0; i < h1->bInCollection; i++)
238 snd_usb_create_stream(chip, ctrlif, h1->baInterfaceNr[i]);
239
240 break;
241 }
242
243 case UAC_VERSION_2: {
Daniel Macke5779992010-03-04 19:46:13 +0100244 struct usb_interface_assoc_descriptor *assoc =
245 usb_ifnum_to_if(dev, ctrlif)->intf_assoc;
246
247 if (!assoc) {
248 snd_printk(KERN_ERR "Audio class v2 interfaces need an interface association\n");
249 return -EINVAL;
250 }
251
Daniel Macke5779992010-03-04 19:46:13 +0100252 for (i = 0; i < assoc->bInterfaceCount; i++) {
253 int intf = assoc->bFirstInterface + i;
254
255 if (intf != ctrlif)
256 snd_usb_create_stream(chip, ctrlif, intf);
257 }
258
259 break;
260 }
Daniel Macke5779992010-03-04 19:46:13 +0100261 }
262
263 return 0;
264}
265
266/*
267 * free the chip instance
268 *
269 * here we have to do not much, since pcm and controls are already freed
270 *
271 */
272
273static int snd_usb_audio_free(struct snd_usb_audio *chip)
274{
275 kfree(chip);
276 return 0;
277}
278
279static int snd_usb_audio_dev_free(struct snd_device *device)
280{
281 struct snd_usb_audio *chip = device->device_data;
282 return snd_usb_audio_free(chip);
283}
284
285
286/*
287 * create a chip instance and set its names.
288 */
289static int snd_usb_audio_create(struct usb_device *dev, int idx,
290 const struct snd_usb_audio_quirk *quirk,
291 struct snd_usb_audio **rchip)
292{
293 struct snd_card *card;
294 struct snd_usb_audio *chip;
295 int err, len;
296 char component[14];
297 static struct snd_device_ops ops = {
298 .dev_free = snd_usb_audio_dev_free,
299 };
300
301 *rchip = NULL;
302
Paul Zimmerman4f4e8f62010-08-13 12:42:07 -0700303 switch (snd_usb_get_speed(dev)) {
304 case USB_SPEED_LOW:
305 case USB_SPEED_FULL:
306 case USB_SPEED_HIGH:
307 case USB_SPEED_SUPER:
308 break;
309 default:
Daniel Macke5779992010-03-04 19:46:13 +0100310 snd_printk(KERN_ERR "unknown device speed %d\n", snd_usb_get_speed(dev));
311 return -ENXIO;
312 }
313
314 err = snd_card_create(index[idx], id[idx], THIS_MODULE, 0, &card);
315 if (err < 0) {
316 snd_printk(KERN_ERR "cannot create card instance %d\n", idx);
317 return err;
318 }
319
320 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
321 if (! chip) {
322 snd_card_free(card);
323 return -ENOMEM;
324 }
325
Takashi Iwai382225e2011-02-22 10:21:18 +0100326 mutex_init(&chip->shutdown_mutex);
Daniel Macke5779992010-03-04 19:46:13 +0100327 chip->index = idx;
328 chip->dev = dev;
329 chip->card = card;
330 chip->setup = device_setup[idx];
331 chip->nrpacks = nrpacks;
332 chip->async_unlink = async_unlink;
333
334 chip->usb_id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
335 le16_to_cpu(dev->descriptor.idProduct));
336 INIT_LIST_HEAD(&chip->pcm_list);
337 INIT_LIST_HEAD(&chip->midi_list);
338 INIT_LIST_HEAD(&chip->mixer_list);
339
340 if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) {
341 snd_usb_audio_free(chip);
342 snd_card_free(card);
343 return err;
344 }
345
346 strcpy(card->driver, "USB-Audio");
347 sprintf(component, "USB%04x:%04x",
348 USB_ID_VENDOR(chip->usb_id), USB_ID_PRODUCT(chip->usb_id));
349 snd_component_add(card, component);
350
351 /* retrieve the device string as shortname */
352 if (quirk && quirk->product_name) {
353 strlcpy(card->shortname, quirk->product_name, sizeof(card->shortname));
354 } else {
355 if (!dev->descriptor.iProduct ||
356 usb_string(dev, dev->descriptor.iProduct,
357 card->shortname, sizeof(card->shortname)) <= 0) {
358 /* no name available from anywhere, so use ID */
359 sprintf(card->shortname, "USB Device %#04x:%#04x",
360 USB_ID_VENDOR(chip->usb_id),
361 USB_ID_PRODUCT(chip->usb_id));
362 }
363 }
364
365 /* retrieve the vendor and device strings as longname */
366 if (quirk && quirk->vendor_name) {
367 len = strlcpy(card->longname, quirk->vendor_name, sizeof(card->longname));
368 } else {
369 if (dev->descriptor.iManufacturer)
370 len = usb_string(dev, dev->descriptor.iManufacturer,
371 card->longname, sizeof(card->longname));
372 else
373 len = 0;
374 /* we don't really care if there isn't any vendor string */
375 }
376 if (len > 0)
377 strlcat(card->longname, " ", sizeof(card->longname));
378
379 strlcat(card->longname, card->shortname, sizeof(card->longname));
380
381 len = strlcat(card->longname, " at ", sizeof(card->longname));
382
383 if (len < sizeof(card->longname))
384 usb_make_path(dev, card->longname + len, sizeof(card->longname) - len);
385
Paul Zimmerman4f4e8f62010-08-13 12:42:07 -0700386 switch (snd_usb_get_speed(dev)) {
387 case USB_SPEED_LOW:
388 strlcat(card->longname, ", low speed", sizeof(card->longname));
389 break;
390 case USB_SPEED_FULL:
391 strlcat(card->longname, ", full speed", sizeof(card->longname));
392 break;
393 case USB_SPEED_HIGH:
394 strlcat(card->longname, ", high speed", sizeof(card->longname));
395 break;
396 case USB_SPEED_SUPER:
397 strlcat(card->longname, ", super speed", sizeof(card->longname));
398 break;
399 default:
400 break;
401 }
Daniel Macke5779992010-03-04 19:46:13 +0100402
403 snd_usb_audio_create_proc(chip);
404
405 *rchip = chip;
406 return 0;
407}
408
409/*
410 * probe the active usb device
411 *
412 * note that this can be called multiple times per a device, when it
413 * includes multiple audio control interfaces.
414 *
415 * thus we check the usb device pointer and creates the card instance
416 * only at the first time. the successive calls of this function will
417 * append the pcm interface to the corresponding card.
418 */
419static void *snd_usb_audio_probe(struct usb_device *dev,
420 struct usb_interface *intf,
421 const struct usb_device_id *usb_id)
422{
423 const struct snd_usb_audio_quirk *quirk = (const struct snd_usb_audio_quirk *)usb_id->driver_info;
424 int i, err;
425 struct snd_usb_audio *chip;
426 struct usb_host_interface *alts;
427 int ifnum;
428 u32 id;
429
430 alts = &intf->altsetting[0];
431 ifnum = get_iface_desc(alts)->bInterfaceNumber;
432 id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
433 le16_to_cpu(dev->descriptor.idProduct));
434 if (quirk && quirk->ifnum >= 0 && ifnum != quirk->ifnum)
435 goto __err_val;
436
437 if (snd_usb_apply_boot_quirk(dev, intf, quirk) < 0)
438 goto __err_val;
439
440 /*
441 * found a config. now register to ALSA
442 */
443
444 /* check whether it's already registered */
445 chip = NULL;
446 mutex_lock(&register_mutex);
447 for (i = 0; i < SNDRV_CARDS; i++) {
448 if (usb_chip[i] && usb_chip[i]->dev == dev) {
449 if (usb_chip[i]->shutdown) {
450 snd_printk(KERN_ERR "USB device is in the shutdown state, cannot create a card instance\n");
451 goto __error;
452 }
453 chip = usb_chip[i];
454 break;
455 }
456 }
457 if (! chip) {
458 /* it's a fresh one.
459 * now look for an empty slot and create a new card instance
460 */
461 for (i = 0; i < SNDRV_CARDS; i++)
462 if (enable[i] && ! usb_chip[i] &&
463 (vid[i] == -1 || vid[i] == USB_ID_VENDOR(id)) &&
464 (pid[i] == -1 || pid[i] == USB_ID_PRODUCT(id))) {
465 if (snd_usb_audio_create(dev, i, quirk, &chip) < 0) {
466 goto __error;
467 }
468 snd_card_set_dev(chip->card, &intf->dev);
469 break;
470 }
471 if (!chip) {
472 printk(KERN_ERR "no available usb audio device\n");
473 goto __error;
474 }
475 }
476
477 chip->txfr_quirk = 0;
478 err = 1; /* continue */
479 if (quirk && quirk->ifnum != QUIRK_NO_INTERFACE) {
480 /* need some special handlings */
481 if ((err = snd_usb_create_quirk(chip, intf, &usb_audio_driver, quirk)) < 0)
482 goto __error;
483 }
484
Daniel Mack7b6717e2010-09-02 17:13:15 +0800485 /*
486 * For devices with more than one control interface, we assume the
487 * first contains the audio controls. We might need a more specific
488 * check here in the future.
489 */
490 if (!chip->ctrl_intf)
491 chip->ctrl_intf = alts;
Daniel Mack79f920f2010-05-31 14:51:31 +0200492
Daniel Macke5779992010-03-04 19:46:13 +0100493 if (err > 0) {
494 /* create normal USB audio interfaces */
495 if (snd_usb_create_streams(chip, ifnum) < 0 ||
496 snd_usb_create_mixer(chip, ifnum, ignore_ctl_error) < 0) {
497 goto __error;
498 }
499 }
500
501 /* we are allowed to call snd_card_register() many times */
502 if (snd_card_register(chip->card) < 0) {
503 goto __error;
504 }
505
506 usb_chip[chip->index] = chip;
507 chip->num_interfaces++;
508 mutex_unlock(&register_mutex);
509 return chip;
510
511 __error:
512 if (chip && !chip->num_interfaces)
513 snd_card_free(chip->card);
514 mutex_unlock(&register_mutex);
515 __err_val:
516 return NULL;
517}
518
519/*
520 * we need to take care of counter, since disconnection can be called also
521 * many times as well as usb_audio_probe().
522 */
523static void snd_usb_audio_disconnect(struct usb_device *dev, void *ptr)
524{
525 struct snd_usb_audio *chip;
526 struct snd_card *card;
527 struct list_head *p;
528
529 if (ptr == (void *)-1L)
530 return;
531
532 chip = ptr;
533 card = chip->card;
534 mutex_lock(&register_mutex);
Takashi Iwai382225e2011-02-22 10:21:18 +0100535 mutex_lock(&chip->shutdown_mutex);
Daniel Macke5779992010-03-04 19:46:13 +0100536 chip->shutdown = 1;
537 chip->num_interfaces--;
538 if (chip->num_interfaces <= 0) {
539 snd_card_disconnect(card);
540 /* release the pcm resources */
541 list_for_each(p, &chip->pcm_list) {
542 snd_usb_stream_disconnect(p);
543 }
544 /* release the midi resources */
545 list_for_each(p, &chip->midi_list) {
546 snd_usbmidi_disconnect(p);
547 }
548 /* release mixer resources */
549 list_for_each(p, &chip->mixer_list) {
550 snd_usb_mixer_disconnect(p);
551 }
552 usb_chip[chip->index] = NULL;
Takashi Iwai382225e2011-02-22 10:21:18 +0100553 mutex_unlock(&chip->shutdown_mutex);
Daniel Macke5779992010-03-04 19:46:13 +0100554 mutex_unlock(&register_mutex);
555 snd_card_free_when_closed(card);
556 } else {
Takashi Iwai382225e2011-02-22 10:21:18 +0100557 mutex_unlock(&chip->shutdown_mutex);
Daniel Macke5779992010-03-04 19:46:13 +0100558 mutex_unlock(&register_mutex);
559 }
560}
561
562/*
563 * new 2.5 USB kernel API
564 */
565static int usb_audio_probe(struct usb_interface *intf,
566 const struct usb_device_id *id)
567{
568 void *chip;
569 chip = snd_usb_audio_probe(interface_to_usbdev(intf), intf, id);
570 if (chip) {
571 usb_set_intfdata(intf, chip);
572 return 0;
573 } else
574 return -EIO;
575}
576
577static void usb_audio_disconnect(struct usb_interface *intf)
578{
579 snd_usb_audio_disconnect(interface_to_usbdev(intf),
580 usb_get_intfdata(intf));
581}
582
583#ifdef CONFIG_PM
584static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message)
585{
586 struct snd_usb_audio *chip = usb_get_intfdata(intf);
587 struct list_head *p;
588 struct snd_usb_stream *as;
589
590 if (chip == (void *)-1L)
591 return 0;
592
593 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot);
594 if (!chip->num_suspended_intf++) {
595 list_for_each(p, &chip->pcm_list) {
596 as = list_entry(p, struct snd_usb_stream, list);
597 snd_pcm_suspend_all(as->pcm);
598 }
599 }
600
601 return 0;
602}
603
604static int usb_audio_resume(struct usb_interface *intf)
605{
606 struct snd_usb_audio *chip = usb_get_intfdata(intf);
607
608 if (chip == (void *)-1L)
609 return 0;
610 if (--chip->num_suspended_intf)
611 return 0;
612 /*
613 * ALSA leaves material resumption to user space
614 * we just notify
615 */
616
617 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0);
618
619 return 0;
620}
Randy Dunlap6407d472010-03-22 08:55:35 -0700621#else
622#define usb_audio_suspend NULL
623#define usb_audio_resume NULL
Daniel Macke5779992010-03-04 19:46:13 +0100624#endif /* CONFIG_PM */
625
626static struct usb_device_id usb_audio_ids [] = {
627#include "quirks-table.h"
628 { .match_flags = (USB_DEVICE_ID_MATCH_INT_CLASS | USB_DEVICE_ID_MATCH_INT_SUBCLASS),
629 .bInterfaceClass = USB_CLASS_AUDIO,
630 .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL },
631 { } /* Terminating entry */
632};
633
634MODULE_DEVICE_TABLE (usb, usb_audio_ids);
635
636/*
637 * entry point for linux usb interface
638 */
639
640static struct usb_driver usb_audio_driver = {
641 .name = "snd-usb-audio",
642 .probe = usb_audio_probe,
643 .disconnect = usb_audio_disconnect,
644 .suspend = usb_audio_suspend,
645 .resume = usb_audio_resume,
646 .id_table = usb_audio_ids,
647};
648
649static int __init snd_usb_audio_init(void)
650{
651 if (nrpacks < 1 || nrpacks > MAX_PACKS) {
652 printk(KERN_WARNING "invalid nrpacks value.\n");
653 return -EINVAL;
654 }
655 return usb_register(&usb_audio_driver);
656}
657
658static void __exit snd_usb_audio_cleanup(void)
659{
660 usb_deregister(&usb_audio_driver);
661}
662
663module_init(snd_usb_audio_init);
664module_exit(snd_usb_audio_cleanup);