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 device_setup[SNDRV_CARDS]; /* device parameter for this card */ 83 static bool ignore_ctl_error; 84 static bool autoclock = true; 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_array(device_setup, int, NULL, 0444); 97 MODULE_PARM_DESC(device_setup, "Specific device setup (if needed)."); 98 module_param(ignore_ctl_error, bool, 0444); 99 MODULE_PARM_DESC(ignore_ctl_error, 100 "Ignore errors from USB controller for mixer interfaces."); 101 module_param(autoclock, bool, 0444); 102 MODULE_PARM_DESC(autoclock, "Enable auto-clock selection for UAC2 devices (default: yes)."); 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 alts = &iface->altsetting[0]; 148 altsd = get_iface_desc(alts); 149 150 /* 151 * Android with both accessory and audio interfaces enabled gets the 152 * interface numbers wrong. 153 */ 154 if ((chip->usb_id == USB_ID(0x18d1, 0x2d04) || 155 chip->usb_id == USB_ID(0x18d1, 0x2d05)) && 156 interface == 0 && 157 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC && 158 altsd->bInterfaceSubClass == USB_SUBCLASS_VENDOR_SPEC) { 159 interface = 2; 160 iface = usb_ifnum_to_if(dev, interface); 161 if (!iface) 162 return -EINVAL; 163 alts = &iface->altsetting[0]; 164 altsd = get_iface_desc(alts); 165 } 166 167 if (usb_interface_claimed(iface)) { 168 snd_printdd(KERN_INFO "%d:%d:%d: skipping, already claimed\n", 169 dev->devnum, ctrlif, interface); 170 return -EINVAL; 171 } 172 173 if ((altsd->bInterfaceClass == USB_CLASS_AUDIO || 174 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC) && 175 altsd->bInterfaceSubClass == USB_SUBCLASS_MIDISTREAMING) { 176 int err = snd_usbmidi_create(chip->card, iface, 177 &chip->midi_list, NULL); 178 if (err < 0) { 179 snd_printk(KERN_ERR "%d:%u:%d: cannot create sequencer device\n", 180 dev->devnum, ctrlif, interface); 181 return -EINVAL; 182 } 183 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L); 184 185 return 0; 186 } 187 188 if ((altsd->bInterfaceClass != USB_CLASS_AUDIO && 189 altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) || 190 altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING) { 191 snd_printdd(KERN_ERR "%d:%u:%d: skipping non-supported interface %d\n", 192 dev->devnum, ctrlif, interface, altsd->bInterfaceClass); 193 /* skip non-supported classes */ 194 return -EINVAL; 195 } 196 197 if (snd_usb_get_speed(dev) == USB_SPEED_LOW) { 198 snd_printk(KERN_ERR "low speed audio streaming not supported\n"); 199 return -EINVAL; 200 } 201 202 if (! snd_usb_parse_audio_interface(chip, interface)) { 203 usb_set_interface(dev, interface, 0); /* reset the current interface */ 204 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L); 205 return -EINVAL; 206 } 207 208 return 0; 209 } 210 211 /* 212 * parse audio control descriptor and create pcm/midi streams 213 */ 214 static int snd_usb_create_streams(struct snd_usb_audio *chip, int ctrlif) 215 { 216 struct usb_device *dev = chip->dev; 217 struct usb_host_interface *host_iface; 218 struct usb_interface_descriptor *altsd; 219 void *control_header; 220 int i, protocol; 221 222 /* find audiocontrol interface */ 223 host_iface = &usb_ifnum_to_if(dev, ctrlif)->altsetting[0]; 224 control_header = snd_usb_find_csint_desc(host_iface->extra, 225 host_iface->extralen, 226 NULL, UAC_HEADER); 227 altsd = get_iface_desc(host_iface); 228 protocol = altsd->bInterfaceProtocol; 229 230 if (!control_header) { 231 snd_printk(KERN_ERR "cannot find UAC_HEADER\n"); 232 return -EINVAL; 233 } 234 235 switch (protocol) { 236 default: 237 snd_printdd(KERN_WARNING "unknown interface protocol %#02x, assuming v1\n", 238 protocol); 239 /* fall through */ 240 241 case UAC_VERSION_1: { 242 struct uac1_ac_header_descriptor *h1 = control_header; 243 244 if (!h1->bInCollection) { 245 snd_printk(KERN_INFO "skipping empty audio interface (v1)\n"); 246 return -EINVAL; 247 } 248 249 if (h1->bLength < sizeof(*h1) + h1->bInCollection) { 250 snd_printk(KERN_ERR "invalid UAC_HEADER (v1)\n"); 251 return -EINVAL; 252 } 253 254 for (i = 0; i < h1->bInCollection; i++) 255 snd_usb_create_stream(chip, ctrlif, h1->baInterfaceNr[i]); 256 257 break; 258 } 259 260 case UAC_VERSION_2: { 261 struct usb_interface_assoc_descriptor *assoc = 262 usb_ifnum_to_if(dev, ctrlif)->intf_assoc; 263 264 if (!assoc) { 265 /* 266 * Firmware writers cannot count to three. So to find 267 * the IAD on the NuForce UDH-100, also check the next 268 * interface. 269 */ 270 struct usb_interface *iface = 271 usb_ifnum_to_if(dev, ctrlif + 1); 272 if (iface && 273 iface->intf_assoc && 274 iface->intf_assoc->bFunctionClass == USB_CLASS_AUDIO && 275 iface->intf_assoc->bFunctionProtocol == UAC_VERSION_2) 276 assoc = iface->intf_assoc; 277 } 278 279 if (!assoc) { 280 snd_printk(KERN_ERR "Audio class v2 interfaces need an interface association\n"); 281 return -EINVAL; 282 } 283 284 for (i = 0; i < assoc->bInterfaceCount; i++) { 285 int intf = assoc->bFirstInterface + i; 286 287 if (intf != ctrlif) 288 snd_usb_create_stream(chip, ctrlif, intf); 289 } 290 291 break; 292 } 293 } 294 295 return 0; 296 } 297 298 /* 299 * free the chip instance 300 * 301 * here we have to do not much, since pcm and controls are already freed 302 * 303 */ 304 305 static int snd_usb_audio_free(struct snd_usb_audio *chip) 306 { 307 mutex_destroy(&chip->mutex); 308 kfree(chip); 309 return 0; 310 } 311 312 static int snd_usb_audio_dev_free(struct snd_device *device) 313 { 314 struct snd_usb_audio *chip = device->device_data; 315 return snd_usb_audio_free(chip); 316 } 317 318 static void remove_trailing_spaces(char *str) 319 { 320 char *p; 321 322 if (!*str) 323 return; 324 for (p = str + strlen(str) - 1; p >= str && isspace(*p); p--) 325 *p = 0; 326 } 327 328 /* 329 * create a chip instance and set its names. 330 */ 331 static int snd_usb_audio_create(struct usb_device *dev, int idx, 332 const struct snd_usb_audio_quirk *quirk, 333 struct snd_usb_audio **rchip) 334 { 335 struct snd_card *card; 336 struct snd_usb_audio *chip; 337 int err, len; 338 char component[14]; 339 static struct snd_device_ops ops = { 340 .dev_free = snd_usb_audio_dev_free, 341 }; 342 343 *rchip = NULL; 344 345 switch (snd_usb_get_speed(dev)) { 346 case USB_SPEED_LOW: 347 case USB_SPEED_FULL: 348 case USB_SPEED_HIGH: 349 case USB_SPEED_SUPER: 350 break; 351 default: 352 snd_printk(KERN_ERR "unknown device speed %d\n", snd_usb_get_speed(dev)); 353 return -ENXIO; 354 } 355 356 err = snd_card_create(index[idx], id[idx], THIS_MODULE, 0, &card); 357 if (err < 0) { 358 snd_printk(KERN_ERR "cannot create card instance %d\n", idx); 359 return err; 360 } 361 362 chip = kzalloc(sizeof(*chip), GFP_KERNEL); 363 if (! chip) { 364 snd_card_free(card); 365 return -ENOMEM; 366 } 367 368 mutex_init(&chip->mutex); 369 init_rwsem(&chip->shutdown_rwsem); 370 chip->index = idx; 371 chip->dev = dev; 372 chip->card = card; 373 chip->setup = device_setup[idx]; 374 chip->autoclock = autoclock; 375 chip->probing = 1; 376 377 chip->usb_id = USB_ID(le16_to_cpu(dev->descriptor.idVendor), 378 le16_to_cpu(dev->descriptor.idProduct)); 379 INIT_LIST_HEAD(&chip->pcm_list); 380 INIT_LIST_HEAD(&chip->ep_list); 381 INIT_LIST_HEAD(&chip->midi_list); 382 INIT_LIST_HEAD(&chip->mixer_list); 383 384 if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) { 385 snd_usb_audio_free(chip); 386 snd_card_free(card); 387 return err; 388 } 389 390 strcpy(card->driver, "USB-Audio"); 391 sprintf(component, "USB%04x:%04x", 392 USB_ID_VENDOR(chip->usb_id), USB_ID_PRODUCT(chip->usb_id)); 393 snd_component_add(card, component); 394 395 /* retrieve the device string as shortname */ 396 if (quirk && quirk->product_name && *quirk->product_name) { 397 strlcpy(card->shortname, quirk->product_name, sizeof(card->shortname)); 398 } else { 399 if (!dev->descriptor.iProduct || 400 usb_string(dev, dev->descriptor.iProduct, 401 card->shortname, sizeof(card->shortname)) <= 0) { 402 /* no name available from anywhere, so use ID */ 403 sprintf(card->shortname, "USB Device %#04x:%#04x", 404 USB_ID_VENDOR(chip->usb_id), 405 USB_ID_PRODUCT(chip->usb_id)); 406 } 407 } 408 remove_trailing_spaces(card->shortname); 409 410 /* retrieve the vendor and device strings as longname */ 411 if (quirk && quirk->vendor_name && *quirk->vendor_name) { 412 len = strlcpy(card->longname, quirk->vendor_name, sizeof(card->longname)); 413 } else { 414 if (dev->descriptor.iManufacturer) 415 len = usb_string(dev, dev->descriptor.iManufacturer, 416 card->longname, sizeof(card->longname)); 417 else 418 len = 0; 419 /* we don't really care if there isn't any vendor string */ 420 } 421 if (len > 0) { 422 remove_trailing_spaces(card->longname); 423 if (*card->longname) 424 strlcat(card->longname, " ", sizeof(card->longname)); 425 } 426 427 strlcat(card->longname, card->shortname, sizeof(card->longname)); 428 429 len = strlcat(card->longname, " at ", sizeof(card->longname)); 430 431 if (len < sizeof(card->longname)) 432 usb_make_path(dev, card->longname + len, sizeof(card->longname) - len); 433 434 switch (snd_usb_get_speed(dev)) { 435 case USB_SPEED_LOW: 436 strlcat(card->longname, ", low speed", sizeof(card->longname)); 437 break; 438 case USB_SPEED_FULL: 439 strlcat(card->longname, ", full speed", sizeof(card->longname)); 440 break; 441 case USB_SPEED_HIGH: 442 strlcat(card->longname, ", high speed", sizeof(card->longname)); 443 break; 444 case USB_SPEED_SUPER: 445 strlcat(card->longname, ", super speed", sizeof(card->longname)); 446 break; 447 default: 448 break; 449 } 450 451 snd_usb_audio_create_proc(chip); 452 453 *rchip = chip; 454 return 0; 455 } 456 457 /* 458 * probe the active usb device 459 * 460 * note that this can be called multiple times per a device, when it 461 * includes multiple audio control interfaces. 462 * 463 * thus we check the usb device pointer and creates the card instance 464 * only at the first time. the successive calls of this function will 465 * append the pcm interface to the corresponding card. 466 */ 467 static struct snd_usb_audio * 468 snd_usb_audio_probe(struct usb_device *dev, 469 struct usb_interface *intf, 470 const struct usb_device_id *usb_id) 471 { 472 const struct snd_usb_audio_quirk *quirk = (const struct snd_usb_audio_quirk *)usb_id->driver_info; 473 int i, err; 474 struct snd_usb_audio *chip; 475 struct usb_host_interface *alts; 476 int ifnum; 477 u32 id; 478 479 alts = &intf->altsetting[0]; 480 ifnum = get_iface_desc(alts)->bInterfaceNumber; 481 id = USB_ID(le16_to_cpu(dev->descriptor.idVendor), 482 le16_to_cpu(dev->descriptor.idProduct)); 483 if (quirk && quirk->ifnum >= 0 && ifnum != quirk->ifnum) 484 goto __err_val; 485 486 if (snd_usb_apply_boot_quirk(dev, intf, quirk) < 0) 487 goto __err_val; 488 489 /* 490 * found a config. now register to ALSA 491 */ 492 493 /* check whether it's already registered */ 494 chip = NULL; 495 mutex_lock(®ister_mutex); 496 for (i = 0; i < SNDRV_CARDS; i++) { 497 if (usb_chip[i] && usb_chip[i]->dev == dev) { 498 if (usb_chip[i]->shutdown) { 499 snd_printk(KERN_ERR "USB device is in the shutdown state, cannot create a card instance\n"); 500 goto __error; 501 } 502 chip = usb_chip[i]; 503 chip->probing = 1; 504 break; 505 } 506 } 507 if (! chip) { 508 /* it's a fresh one. 509 * now look for an empty slot and create a new card instance 510 */ 511 for (i = 0; i < SNDRV_CARDS; i++) 512 if (enable[i] && ! usb_chip[i] && 513 (vid[i] == -1 || vid[i] == USB_ID_VENDOR(id)) && 514 (pid[i] == -1 || pid[i] == USB_ID_PRODUCT(id))) { 515 if (snd_usb_audio_create(dev, i, quirk, &chip) < 0) { 516 goto __error; 517 } 518 snd_card_set_dev(chip->card, &intf->dev); 519 chip->pm_intf = intf; 520 break; 521 } 522 if (!chip) { 523 printk(KERN_ERR "no available usb audio device\n"); 524 goto __error; 525 } 526 } 527 528 /* 529 * For devices with more than one control interface, we assume the 530 * first contains the audio controls. We might need a more specific 531 * check here in the future. 532 */ 533 if (!chip->ctrl_intf) 534 chip->ctrl_intf = alts; 535 536 chip->txfr_quirk = 0; 537 err = 1; /* continue */ 538 if (quirk && quirk->ifnum != QUIRK_NO_INTERFACE) { 539 /* need some special handlings */ 540 if ((err = snd_usb_create_quirk(chip, intf, &usb_audio_driver, quirk)) < 0) 541 goto __error; 542 } 543 544 if (err > 0) { 545 /* create normal USB audio interfaces */ 546 if (snd_usb_create_streams(chip, ifnum) < 0 || 547 snd_usb_create_mixer(chip, ifnum, ignore_ctl_error) < 0) { 548 goto __error; 549 } 550 } 551 552 /* we are allowed to call snd_card_register() many times */ 553 if (snd_card_register(chip->card) < 0) { 554 goto __error; 555 } 556 557 usb_chip[chip->index] = chip; 558 chip->num_interfaces++; 559 chip->probing = 0; 560 mutex_unlock(®ister_mutex); 561 return chip; 562 563 __error: 564 if (chip) { 565 if (!chip->num_interfaces) 566 snd_card_free(chip->card); 567 chip->probing = 0; 568 } 569 mutex_unlock(®ister_mutex); 570 __err_val: 571 return NULL; 572 } 573 574 /* 575 * we need to take care of counter, since disconnection can be called also 576 * many times as well as usb_audio_probe(). 577 */ 578 static void snd_usb_audio_disconnect(struct usb_device *dev, 579 struct snd_usb_audio *chip) 580 { 581 struct snd_card *card; 582 struct list_head *p, *n; 583 584 if (chip == (void *)-1L) 585 return; 586 587 card = chip->card; 588 down_write(&chip->shutdown_rwsem); 589 chip->shutdown = 1; 590 up_write(&chip->shutdown_rwsem); 591 592 mutex_lock(®ister_mutex); 593 chip->num_interfaces--; 594 if (chip->num_interfaces <= 0) { 595 snd_card_disconnect(card); 596 /* release the pcm resources */ 597 list_for_each(p, &chip->pcm_list) { 598 snd_usb_stream_disconnect(p); 599 } 600 /* release the endpoint resources */ 601 list_for_each_safe(p, n, &chip->ep_list) { 602 snd_usb_endpoint_free(p); 603 } 604 /* release the midi resources */ 605 list_for_each(p, &chip->midi_list) { 606 snd_usbmidi_disconnect(p); 607 } 608 /* release mixer resources */ 609 list_for_each(p, &chip->mixer_list) { 610 snd_usb_mixer_disconnect(p); 611 } 612 usb_chip[chip->index] = NULL; 613 mutex_unlock(®ister_mutex); 614 snd_card_free_when_closed(card); 615 } else { 616 mutex_unlock(®ister_mutex); 617 } 618 } 619 620 /* 621 * new 2.5 USB kernel API 622 */ 623 static int usb_audio_probe(struct usb_interface *intf, 624 const struct usb_device_id *id) 625 { 626 struct snd_usb_audio *chip; 627 chip = snd_usb_audio_probe(interface_to_usbdev(intf), intf, id); 628 if (chip) { 629 usb_set_intfdata(intf, chip); 630 return 0; 631 } else 632 return -EIO; 633 } 634 635 static void usb_audio_disconnect(struct usb_interface *intf) 636 { 637 snd_usb_audio_disconnect(interface_to_usbdev(intf), 638 usb_get_intfdata(intf)); 639 } 640 641 #ifdef CONFIG_PM 642 643 int snd_usb_autoresume(struct snd_usb_audio *chip) 644 { 645 int err = -ENODEV; 646 647 down_read(&chip->shutdown_rwsem); 648 if (chip->probing) 649 err = 0; 650 else if (!chip->shutdown) 651 err = usb_autopm_get_interface(chip->pm_intf); 652 up_read(&chip->shutdown_rwsem); 653 654 return err; 655 } 656 657 void snd_usb_autosuspend(struct snd_usb_audio *chip) 658 { 659 down_read(&chip->shutdown_rwsem); 660 if (!chip->shutdown && !chip->probing) 661 usb_autopm_put_interface(chip->pm_intf); 662 up_read(&chip->shutdown_rwsem); 663 } 664 665 static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message) 666 { 667 struct snd_usb_audio *chip = usb_get_intfdata(intf); 668 struct snd_usb_stream *as; 669 struct usb_mixer_interface *mixer; 670 671 if (chip == (void *)-1L) 672 return 0; 673 674 if (!PMSG_IS_AUTO(message)) { 675 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot); 676 if (!chip->num_suspended_intf++) { 677 list_for_each_entry(as, &chip->pcm_list, list) { 678 snd_pcm_suspend_all(as->pcm); 679 as->substream[0].need_setup_ep = 680 as->substream[1].need_setup_ep = true; 681 } 682 } 683 } else { 684 /* 685 * otherwise we keep the rest of the system in the dark 686 * to keep this transparent 687 */ 688 if (!chip->num_suspended_intf++) 689 chip->autosuspended = 1; 690 } 691 692 list_for_each_entry(mixer, &chip->mixer_list, list) 693 snd_usb_mixer_inactivate(mixer); 694 695 return 0; 696 } 697 698 static int usb_audio_resume(struct usb_interface *intf) 699 { 700 struct snd_usb_audio *chip = usb_get_intfdata(intf); 701 struct usb_mixer_interface *mixer; 702 int err = 0; 703 704 if (chip == (void *)-1L) 705 return 0; 706 if (--chip->num_suspended_intf) 707 return 0; 708 /* 709 * ALSA leaves material resumption to user space 710 * we just notify and restart the mixers 711 */ 712 list_for_each_entry(mixer, &chip->mixer_list, list) { 713 err = snd_usb_mixer_activate(mixer); 714 if (err < 0) 715 goto err_out; 716 } 717 718 if (!chip->autosuspended) 719 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0); 720 chip->autosuspended = 0; 721 722 err_out: 723 return err; 724 } 725 #else 726 #define usb_audio_suspend NULL 727 #define usb_audio_resume NULL 728 #endif /* CONFIG_PM */ 729 730 static struct usb_device_id usb_audio_ids [] = { 731 #include "quirks-table.h" 732 { .match_flags = (USB_DEVICE_ID_MATCH_INT_CLASS | USB_DEVICE_ID_MATCH_INT_SUBCLASS), 733 .bInterfaceClass = USB_CLASS_AUDIO, 734 .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL }, 735 { } /* Terminating entry */ 736 }; 737 MODULE_DEVICE_TABLE(usb, usb_audio_ids); 738 739 /* 740 * entry point for linux usb interface 741 */ 742 743 static struct usb_driver usb_audio_driver = { 744 .name = "snd-usb-audio", 745 .probe = usb_audio_probe, 746 .disconnect = usb_audio_disconnect, 747 .suspend = usb_audio_suspend, 748 .resume = usb_audio_resume, 749 .id_table = usb_audio_ids, 750 .supports_autosuspend = 1, 751 }; 752 753 static int __init snd_usb_audio_init(void) 754 { 755 return usb_register(&usb_audio_driver); 756 } 757 758 static void __exit snd_usb_audio_cleanup(void) 759 { 760 usb_deregister(&usb_audio_driver); 761 } 762 763 module_init(snd_usb_audio_init); 764 module_exit(snd_usb_audio_cleanup); 765