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 * - the linked URBs would be preferred but not used so far because of 29 * the instability of unlinking. 30 * - type II is not supported properly. there is no device which supports 31 * this type *correctly*. SB extigy looks as if it supports, but it's 32 * indeed an AC3 stream packed in SPDIF frames (i.e. no real AC3 stream). 33 */ 34 35 36 #include <linux/bitops.h> 37 #include <linux/init.h> 38 #include <linux/list.h> 39 #include <linux/slab.h> 40 #include <linux/string.h> 41 #include <linux/ctype.h> 42 #include <linux/usb.h> 43 #include <linux/moduleparam.h> 44 #include <linux/mutex.h> 45 #include <linux/usb/audio.h> 46 #include <linux/usb/audio-v2.h> 47 #include <linux/module.h> 48 49 #include <sound/control.h> 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" 59 #include "mixer.h" 60 #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 "format.h" 67 #include "power.h" 68 #include "stream.h" 69 70 MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>"); 71 MODULE_DESCRIPTION("USB Audio"); 72 MODULE_LICENSE("GPL"); 73 MODULE_SUPPORTED_DEVICE("{{Generic,USB Audio}}"); 74 75 76 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */ 77 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */ 78 static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;/* Enable this card */ 79 /* Vendor/product IDs for this card */ 80 static int vid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 }; 81 static int pid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 }; 82 static int nrpacks = 8; /* max. number of packets per urb */ 83 static int device_setup[SNDRV_CARDS]; /* device parameter for this card */ 84 static bool ignore_ctl_error; 85 86 module_param_array(index, int, NULL, 0444); 87 MODULE_PARM_DESC(index, "Index value for the USB audio adapter."); 88 module_param_array(id, charp, NULL, 0444); 89 MODULE_PARM_DESC(id, "ID string for the USB audio adapter."); 90 module_param_array(enable, bool, NULL, 0444); 91 MODULE_PARM_DESC(enable, "Enable USB audio adapter."); 92 module_param_array(vid, int, NULL, 0444); 93 MODULE_PARM_DESC(vid, "Vendor ID for the USB audio device."); 94 module_param_array(pid, int, NULL, 0444); 95 MODULE_PARM_DESC(pid, "Product ID for the USB audio device."); 96 module_param(nrpacks, int, 0644); 97 MODULE_PARM_DESC(nrpacks, "Max. number of packets per URB."); 98 module_param_array(device_setup, int, NULL, 0444); 99 MODULE_PARM_DESC(device_setup, "Specific device setup (if needed)."); 100 module_param(ignore_ctl_error, bool, 0444); 101 MODULE_PARM_DESC(ignore_ctl_error, 102 "Ignore errors from USB controller for mixer interfaces."); 103 104 /* 105 * we keep the snd_usb_audio_t instances by ourselves for merging 106 * the all interfaces on the same card as one sound device. 107 */ 108 109 static DEFINE_MUTEX(register_mutex); 110 static struct snd_usb_audio *usb_chip[SNDRV_CARDS]; 111 static struct usb_driver usb_audio_driver; 112 113 /* 114 * disconnect streams 115 * called from snd_usb_audio_disconnect() 116 */ 117 static void snd_usb_stream_disconnect(struct list_head *head) 118 { 119 int idx; 120 struct snd_usb_stream *as; 121 struct snd_usb_substream *subs; 122 123 as = list_entry(head, struct snd_usb_stream, list); 124 for (idx = 0; idx < 2; idx++) { 125 subs = &as->substream[idx]; 126 if (!subs->num_formats) 127 continue; 128 subs->interface = -1; 129 subs->data_endpoint = NULL; 130 subs->sync_endpoint = NULL; 131 } 132 } 133 134 static int snd_usb_create_stream(struct snd_usb_audio *chip, int ctrlif, int interface) 135 { 136 struct usb_device *dev = chip->dev; 137 struct usb_host_interface *alts; 138 struct usb_interface_descriptor *altsd; 139 struct usb_interface *iface = usb_ifnum_to_if(dev, interface); 140 141 if (!iface) { 142 snd_printk(KERN_ERR "%d:%u:%d : does not exist\n", 143 dev->devnum, ctrlif, interface); 144 return -EINVAL; 145 } 146 147 if (usb_interface_claimed(iface)) { 148 snd_printdd(KERN_INFO "%d:%d:%d: skipping, already claimed\n", 149 dev->devnum, ctrlif, interface); 150 return -EINVAL; 151 } 152 153 alts = &iface->altsetting[0]; 154 altsd = get_iface_desc(alts); 155 if ((altsd->bInterfaceClass == USB_CLASS_AUDIO || 156 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC) && 157 altsd->bInterfaceSubClass == USB_SUBCLASS_MIDISTREAMING) { 158 int err = snd_usbmidi_create(chip->card, iface, 159 &chip->midi_list, NULL); 160 if (err < 0) { 161 snd_printk(KERN_ERR "%d:%u:%d: cannot create sequencer device\n", 162 dev->devnum, ctrlif, interface); 163 return -EINVAL; 164 } 165 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L); 166 167 return 0; 168 } 169 170 if ((altsd->bInterfaceClass != USB_CLASS_AUDIO && 171 altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) || 172 altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING) { 173 snd_printdd(KERN_ERR "%d:%u:%d: skipping non-supported interface %d\n", 174 dev->devnum, ctrlif, interface, altsd->bInterfaceClass); 175 /* skip non-supported classes */ 176 return -EINVAL; 177 } 178 179 if (snd_usb_get_speed(dev) == USB_SPEED_LOW) { 180 snd_printk(KERN_ERR "low speed audio streaming not supported\n"); 181 return -EINVAL; 182 } 183 184 if (! snd_usb_parse_audio_interface(chip, interface)) { 185 usb_set_interface(dev, interface, 0); /* reset the current interface */ 186 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L); 187 return -EINVAL; 188 } 189 190 return 0; 191 } 192 193 /* 194 * parse audio control descriptor and create pcm/midi streams 195 */ 196 static int snd_usb_create_streams(struct snd_usb_audio *chip, int ctrlif) 197 { 198 struct usb_device *dev = chip->dev; 199 struct usb_host_interface *host_iface; 200 struct usb_interface_descriptor *altsd; 201 void *control_header; 202 int i, protocol; 203 204 /* find audiocontrol interface */ 205 host_iface = &usb_ifnum_to_if(dev, ctrlif)->altsetting[0]; 206 control_header = snd_usb_find_csint_desc(host_iface->extra, 207 host_iface->extralen, 208 NULL, UAC_HEADER); 209 altsd = get_iface_desc(host_iface); 210 protocol = altsd->bInterfaceProtocol; 211 212 if (!control_header) { 213 snd_printk(KERN_ERR "cannot find UAC_HEADER\n"); 214 return -EINVAL; 215 } 216 217 switch (protocol) { 218 default: 219 snd_printdd(KERN_WARNING "unknown interface protocol %#02x, assuming v1\n", 220 protocol); 221 /* fall through */ 222 223 case UAC_VERSION_1: { 224 struct uac1_ac_header_descriptor *h1 = control_header; 225 226 if (!h1->bInCollection) { 227 snd_printk(KERN_INFO "skipping empty audio interface (v1)\n"); 228 return -EINVAL; 229 } 230 231 if (h1->bLength < sizeof(*h1) + h1->bInCollection) { 232 snd_printk(KERN_ERR "invalid UAC_HEADER (v1)\n"); 233 return -EINVAL; 234 } 235 236 for (i = 0; i < h1->bInCollection; i++) 237 snd_usb_create_stream(chip, ctrlif, h1->baInterfaceNr[i]); 238 239 break; 240 } 241 242 case UAC_VERSION_2: { 243 struct usb_interface_assoc_descriptor *assoc = 244 usb_ifnum_to_if(dev, ctrlif)->intf_assoc; 245 246 if (!assoc) { 247 snd_printk(KERN_ERR "Audio class v2 interfaces need an interface association\n"); 248 return -EINVAL; 249 } 250 251 for (i = 0; i < assoc->bInterfaceCount; i++) { 252 int intf = assoc->bFirstInterface + i; 253 254 if (intf != ctrlif) 255 snd_usb_create_stream(chip, ctrlif, intf); 256 } 257 258 break; 259 } 260 } 261 262 return 0; 263 } 264 265 /* 266 * free the chip instance 267 * 268 * here we have to do not much, since pcm and controls are already freed 269 * 270 */ 271 272 static int snd_usb_audio_free(struct snd_usb_audio *chip) 273 { 274 mutex_destroy(&chip->mutex); 275 kfree(chip); 276 return 0; 277 } 278 279 static 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 static void remove_trailing_spaces(char *str) 286 { 287 char *p; 288 289 if (!*str) 290 return; 291 for (p = str + strlen(str) - 1; p >= str && isspace(*p); p--) 292 *p = 0; 293 } 294 295 /* 296 * create a chip instance and set its names. 297 */ 298 static int snd_usb_audio_create(struct usb_device *dev, int idx, 299 const struct snd_usb_audio_quirk *quirk, 300 struct snd_usb_audio **rchip) 301 { 302 struct snd_card *card; 303 struct snd_usb_audio *chip; 304 int err, len; 305 char component[14]; 306 static struct snd_device_ops ops = { 307 .dev_free = snd_usb_audio_dev_free, 308 }; 309 310 *rchip = NULL; 311 312 switch (snd_usb_get_speed(dev)) { 313 case USB_SPEED_LOW: 314 case USB_SPEED_FULL: 315 case USB_SPEED_HIGH: 316 case USB_SPEED_SUPER: 317 break; 318 default: 319 snd_printk(KERN_ERR "unknown device speed %d\n", snd_usb_get_speed(dev)); 320 return -ENXIO; 321 } 322 323 err = snd_card_create(index[idx], id[idx], THIS_MODULE, 0, &card); 324 if (err < 0) { 325 snd_printk(KERN_ERR "cannot create card instance %d\n", idx); 326 return err; 327 } 328 329 chip = kzalloc(sizeof(*chip), GFP_KERNEL); 330 if (! chip) { 331 snd_card_free(card); 332 return -ENOMEM; 333 } 334 335 mutex_init(&chip->mutex); 336 init_rwsem(&chip->shutdown_rwsem); 337 chip->index = idx; 338 chip->dev = dev; 339 chip->card = card; 340 chip->setup = device_setup[idx]; 341 chip->nrpacks = nrpacks; 342 chip->probing = 1; 343 344 chip->usb_id = USB_ID(le16_to_cpu(dev->descriptor.idVendor), 345 le16_to_cpu(dev->descriptor.idProduct)); 346 INIT_LIST_HEAD(&chip->pcm_list); 347 INIT_LIST_HEAD(&chip->ep_list); 348 INIT_LIST_HEAD(&chip->midi_list); 349 INIT_LIST_HEAD(&chip->mixer_list); 350 351 if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) { 352 snd_usb_audio_free(chip); 353 snd_card_free(card); 354 return err; 355 } 356 357 strcpy(card->driver, "USB-Audio"); 358 sprintf(component, "USB%04x:%04x", 359 USB_ID_VENDOR(chip->usb_id), USB_ID_PRODUCT(chip->usb_id)); 360 snd_component_add(card, component); 361 362 /* retrieve the device string as shortname */ 363 if (quirk && quirk->product_name && *quirk->product_name) { 364 strlcpy(card->shortname, quirk->product_name, sizeof(card->shortname)); 365 } else { 366 if (!dev->descriptor.iProduct || 367 usb_string(dev, dev->descriptor.iProduct, 368 card->shortname, sizeof(card->shortname)) <= 0) { 369 /* no name available from anywhere, so use ID */ 370 sprintf(card->shortname, "USB Device %#04x:%#04x", 371 USB_ID_VENDOR(chip->usb_id), 372 USB_ID_PRODUCT(chip->usb_id)); 373 } 374 } 375 remove_trailing_spaces(card->shortname); 376 377 /* retrieve the vendor and device strings as longname */ 378 if (quirk && quirk->vendor_name && *quirk->vendor_name) { 379 len = strlcpy(card->longname, quirk->vendor_name, sizeof(card->longname)); 380 } else { 381 if (dev->descriptor.iManufacturer) 382 len = usb_string(dev, dev->descriptor.iManufacturer, 383 card->longname, sizeof(card->longname)); 384 else 385 len = 0; 386 /* we don't really care if there isn't any vendor string */ 387 } 388 if (len > 0) { 389 remove_trailing_spaces(card->longname); 390 if (*card->longname) 391 strlcat(card->longname, " ", sizeof(card->longname)); 392 } 393 394 strlcat(card->longname, card->shortname, sizeof(card->longname)); 395 396 len = strlcat(card->longname, " at ", sizeof(card->longname)); 397 398 if (len < sizeof(card->longname)) 399 usb_make_path(dev, card->longname + len, sizeof(card->longname) - len); 400 401 switch (snd_usb_get_speed(dev)) { 402 case USB_SPEED_LOW: 403 strlcat(card->longname, ", low speed", sizeof(card->longname)); 404 break; 405 case USB_SPEED_FULL: 406 strlcat(card->longname, ", full speed", sizeof(card->longname)); 407 break; 408 case USB_SPEED_HIGH: 409 strlcat(card->longname, ", high speed", sizeof(card->longname)); 410 break; 411 case USB_SPEED_SUPER: 412 strlcat(card->longname, ", super speed", sizeof(card->longname)); 413 break; 414 default: 415 break; 416 } 417 418 snd_usb_audio_create_proc(chip); 419 420 *rchip = chip; 421 return 0; 422 } 423 424 /* 425 * probe the active usb device 426 * 427 * note that this can be called multiple times per a device, when it 428 * includes multiple audio control interfaces. 429 * 430 * thus we check the usb device pointer and creates the card instance 431 * only at the first time. the successive calls of this function will 432 * append the pcm interface to the corresponding card. 433 */ 434 static struct snd_usb_audio * 435 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) { 532 if (!chip->num_interfaces) 533 snd_card_free(chip->card); 534 chip->probing = 0; 535 } 536 mutex_unlock(®ister_mutex); 537 __err_val: 538 return NULL; 539 } 540 541 /* 542 * we need to take care of counter, since disconnection can be called also 543 * many times as well as usb_audio_probe(). 544 */ 545 static void snd_usb_audio_disconnect(struct usb_device *dev, 546 struct snd_usb_audio *chip) 547 { 548 struct snd_card *card; 549 struct list_head *p, *n; 550 551 if (chip == (void *)-1L) 552 return; 553 554 card = chip->card; 555 down_write(&chip->shutdown_rwsem); 556 chip->shutdown = 1; 557 up_write(&chip->shutdown_rwsem); 558 559 mutex_lock(®ister_mutex); 560 chip->num_interfaces--; 561 if (chip->num_interfaces <= 0) { 562 snd_card_disconnect(card); 563 /* release the pcm resources */ 564 list_for_each(p, &chip->pcm_list) { 565 snd_usb_stream_disconnect(p); 566 } 567 /* release the endpoint resources */ 568 list_for_each_safe(p, n, &chip->ep_list) { 569 snd_usb_endpoint_free(p); 570 } 571 /* release the midi resources */ 572 list_for_each(p, &chip->midi_list) { 573 snd_usbmidi_disconnect(p); 574 } 575 /* release mixer resources */ 576 list_for_each(p, &chip->mixer_list) { 577 snd_usb_mixer_disconnect(p); 578 } 579 usb_chip[chip->index] = NULL; 580 mutex_unlock(®ister_mutex); 581 snd_card_free_when_closed(card); 582 } else { 583 mutex_unlock(®ister_mutex); 584 } 585 } 586 587 /* 588 * new 2.5 USB kernel API 589 */ 590 static int usb_audio_probe(struct usb_interface *intf, 591 const struct usb_device_id *id) 592 { 593 struct snd_usb_audio *chip; 594 chip = snd_usb_audio_probe(interface_to_usbdev(intf), intf, id); 595 if (chip) { 596 usb_set_intfdata(intf, chip); 597 return 0; 598 } else 599 return -EIO; 600 } 601 602 static void usb_audio_disconnect(struct usb_interface *intf) 603 { 604 snd_usb_audio_disconnect(interface_to_usbdev(intf), 605 usb_get_intfdata(intf)); 606 } 607 608 #ifdef CONFIG_PM 609 610 int snd_usb_autoresume(struct snd_usb_audio *chip) 611 { 612 int err = -ENODEV; 613 614 down_read(&chip->shutdown_rwsem); 615 if (!chip->shutdown && !chip->probing) 616 err = usb_autopm_get_interface(chip->pm_intf); 617 up_read(&chip->shutdown_rwsem); 618 619 return err; 620 } 621 622 void snd_usb_autosuspend(struct snd_usb_audio *chip) 623 { 624 down_read(&chip->shutdown_rwsem); 625 if (!chip->shutdown && !chip->probing) 626 usb_autopm_put_interface(chip->pm_intf); 627 up_read(&chip->shutdown_rwsem); 628 } 629 630 static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message) 631 { 632 struct snd_usb_audio *chip = usb_get_intfdata(intf); 633 struct list_head *p; 634 struct snd_usb_stream *as; 635 struct usb_mixer_interface *mixer; 636 637 if (chip == (void *)-1L) 638 return 0; 639 640 if (!PMSG_IS_AUTO(message)) { 641 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot); 642 if (!chip->num_suspended_intf++) { 643 list_for_each(p, &chip->pcm_list) { 644 as = list_entry(p, struct snd_usb_stream, list); 645 snd_pcm_suspend_all(as->pcm); 646 as->substream[0].need_setup_ep = 647 as->substream[1].need_setup_ep = true; 648 } 649 } 650 } else { 651 /* 652 * otherwise we keep the rest of the system in the dark 653 * to keep this transparent 654 */ 655 if (!chip->num_suspended_intf++) 656 chip->autosuspended = 1; 657 } 658 659 list_for_each_entry(mixer, &chip->mixer_list, list) 660 snd_usb_mixer_inactivate(mixer); 661 662 return 0; 663 } 664 665 static int usb_audio_resume(struct usb_interface *intf) 666 { 667 struct snd_usb_audio *chip = usb_get_intfdata(intf); 668 struct usb_mixer_interface *mixer; 669 int err = 0; 670 671 if (chip == (void *)-1L) 672 return 0; 673 if (--chip->num_suspended_intf) 674 return 0; 675 /* 676 * ALSA leaves material resumption to user space 677 * we just notify and restart the mixers 678 */ 679 list_for_each_entry(mixer, &chip->mixer_list, list) { 680 err = snd_usb_mixer_activate(mixer); 681 if (err < 0) 682 goto err_out; 683 } 684 685 if (!chip->autosuspended) 686 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0); 687 chip->autosuspended = 0; 688 689 err_out: 690 return err; 691 } 692 #else 693 #define usb_audio_suspend NULL 694 #define usb_audio_resume NULL 695 #endif /* CONFIG_PM */ 696 697 static struct usb_device_id usb_audio_ids [] = { 698 #include "quirks-table.h" 699 { .match_flags = (USB_DEVICE_ID_MATCH_INT_CLASS | USB_DEVICE_ID_MATCH_INT_SUBCLASS), 700 .bInterfaceClass = USB_CLASS_AUDIO, 701 .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL }, 702 { } /* Terminating entry */ 703 }; 704 705 MODULE_DEVICE_TABLE (usb, usb_audio_ids); 706 707 /* 708 * entry point for linux usb interface 709 */ 710 711 static struct usb_driver usb_audio_driver = { 712 .name = "snd-usb-audio", 713 .probe = usb_audio_probe, 714 .disconnect = usb_audio_disconnect, 715 .suspend = usb_audio_suspend, 716 .resume = usb_audio_resume, 717 .id_table = usb_audio_ids, 718 .supports_autosuspend = 1, 719 }; 720 721 static int __init snd_usb_audio_init(void) 722 { 723 if (nrpacks < 1 || nrpacks > MAX_PACKS) { 724 printk(KERN_WARNING "invalid nrpacks value.\n"); 725 return -EINVAL; 726 } 727 return usb_register(&usb_audio_driver); 728 } 729 730 static void __exit snd_usb_audio_cleanup(void) 731 { 732 usb_deregister(&usb_audio_driver); 733 } 734 735 module_init(snd_usb_audio_init); 736 module_exit(snd_usb_audio_cleanup); 737