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(®ister_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 /* 496 * For devices with more than one control interface, we assume the 497 * first contains the audio controls. We might need a more specific 498 * check here in the future. 499 */ 500 if (!chip->ctrl_intf) 501 chip->ctrl_intf = alts; 502 503 chip->txfr_quirk = 0; 504 err = 1; /* continue */ 505 if (quirk && quirk->ifnum != QUIRK_NO_INTERFACE) { 506 /* need some special handlings */ 507 if ((err = snd_usb_create_quirk(chip, intf, &usb_audio_driver, quirk)) < 0) 508 goto __error; 509 } 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(®ister_mutex); 528 return chip; 529 530 __error: 531 if (chip && !chip->num_interfaces) 532 snd_card_free(chip->card); 533 mutex_unlock(®ister_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(®ister_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(®ister_mutex); 574 snd_card_free_when_closed(card); 575 } else { 576 mutex_unlock(&chip->shutdown_mutex); 577 mutex_unlock(®ister_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); 725