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