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 static bool autoclock = true; 86 87 module_param_array(index, int, NULL, 0444); 88 MODULE_PARM_DESC(index, "Index value for the USB audio adapter."); 89 module_param_array(id, charp, NULL, 0444); 90 MODULE_PARM_DESC(id, "ID string for the USB audio adapter."); 91 module_param_array(enable, bool, NULL, 0444); 92 MODULE_PARM_DESC(enable, "Enable USB audio adapter."); 93 module_param_array(vid, int, NULL, 0444); 94 MODULE_PARM_DESC(vid, "Vendor ID for the USB audio device."); 95 module_param_array(pid, int, NULL, 0444); 96 MODULE_PARM_DESC(pid, "Product ID for the USB audio device."); 97 module_param(nrpacks, int, 0644); 98 MODULE_PARM_DESC(nrpacks, "Max. number of packets per URB."); 99 module_param_array(device_setup, int, NULL, 0444); 100 MODULE_PARM_DESC(device_setup, "Specific device setup (if needed)."); 101 module_param(ignore_ctl_error, bool, 0444); 102 MODULE_PARM_DESC(ignore_ctl_error, 103 "Ignore errors from USB controller for mixer interfaces."); 104 module_param(autoclock, bool, 0444); 105 MODULE_PARM_DESC(autoclock, "Enable auto-clock selection for UAC2 devices (default: yes)."); 106 107 /* 108 * we keep the snd_usb_audio_t instances by ourselves for merging 109 * the all interfaces on the same card as one sound device. 110 */ 111 112 static DEFINE_MUTEX(register_mutex); 113 static struct snd_usb_audio *usb_chip[SNDRV_CARDS]; 114 static struct usb_driver usb_audio_driver; 115 116 /* 117 * disconnect streams 118 * called from snd_usb_audio_disconnect() 119 */ 120 static void snd_usb_stream_disconnect(struct list_head *head) 121 { 122 int idx; 123 struct snd_usb_stream *as; 124 struct snd_usb_substream *subs; 125 126 as = list_entry(head, struct snd_usb_stream, list); 127 for (idx = 0; idx < 2; idx++) { 128 subs = &as->substream[idx]; 129 if (!subs->num_formats) 130 continue; 131 subs->interface = -1; 132 subs->data_endpoint = NULL; 133 subs->sync_endpoint = NULL; 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 alts = &iface->altsetting[0]; 151 altsd = get_iface_desc(alts); 152 153 /* 154 * Android with both accessory and audio interfaces enabled gets the 155 * interface numbers wrong. 156 */ 157 if ((chip->usb_id == USB_ID(0x18d1, 0x2d04) || 158 chip->usb_id == USB_ID(0x18d1, 0x2d05)) && 159 interface == 0 && 160 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC && 161 altsd->bInterfaceSubClass == USB_SUBCLASS_VENDOR_SPEC) { 162 interface = 2; 163 iface = usb_ifnum_to_if(dev, interface); 164 if (!iface) 165 return -EINVAL; 166 alts = &iface->altsetting[0]; 167 altsd = get_iface_desc(alts); 168 } 169 170 if (usb_interface_claimed(iface)) { 171 snd_printdd(KERN_INFO "%d:%d:%d: skipping, already claimed\n", 172 dev->devnum, ctrlif, interface); 173 return -EINVAL; 174 } 175 176 if ((altsd->bInterfaceClass == USB_CLASS_AUDIO || 177 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC) && 178 altsd->bInterfaceSubClass == USB_SUBCLASS_MIDISTREAMING) { 179 int err = snd_usbmidi_create(chip->card, iface, 180 &chip->midi_list, NULL); 181 if (err < 0) { 182 snd_printk(KERN_ERR "%d:%u:%d: cannot create sequencer device\n", 183 dev->devnum, ctrlif, interface); 184 return -EINVAL; 185 } 186 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L); 187 188 return 0; 189 } 190 191 if ((altsd->bInterfaceClass != USB_CLASS_AUDIO && 192 altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) || 193 altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING) { 194 snd_printdd(KERN_ERR "%d:%u:%d: skipping non-supported interface %d\n", 195 dev->devnum, ctrlif, interface, altsd->bInterfaceClass); 196 /* skip non-supported classes */ 197 return -EINVAL; 198 } 199 200 if (snd_usb_get_speed(dev) == USB_SPEED_LOW) { 201 snd_printk(KERN_ERR "low speed audio streaming not supported\n"); 202 return -EINVAL; 203 } 204 205 if (! snd_usb_parse_audio_interface(chip, interface)) { 206 usb_set_interface(dev, interface, 0); /* reset the current interface */ 207 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L); 208 return -EINVAL; 209 } 210 211 return 0; 212 } 213 214 /* 215 * parse audio control descriptor and create pcm/midi streams 216 */ 217 static int snd_usb_create_streams(struct snd_usb_audio *chip, int ctrlif) 218 { 219 struct usb_device *dev = chip->dev; 220 struct usb_host_interface *host_iface; 221 struct usb_interface_descriptor *altsd; 222 void *control_header; 223 int i, protocol; 224 225 /* find audiocontrol interface */ 226 host_iface = &usb_ifnum_to_if(dev, ctrlif)->altsetting[0]; 227 control_header = snd_usb_find_csint_desc(host_iface->extra, 228 host_iface->extralen, 229 NULL, UAC_HEADER); 230 altsd = get_iface_desc(host_iface); 231 protocol = altsd->bInterfaceProtocol; 232 233 if (!control_header) { 234 snd_printk(KERN_ERR "cannot find UAC_HEADER\n"); 235 return -EINVAL; 236 } 237 238 switch (protocol) { 239 default: 240 snd_printdd(KERN_WARNING "unknown interface protocol %#02x, assuming v1\n", 241 protocol); 242 /* fall through */ 243 244 case UAC_VERSION_1: { 245 struct uac1_ac_header_descriptor *h1 = control_header; 246 247 if (!h1->bInCollection) { 248 snd_printk(KERN_INFO "skipping empty audio interface (v1)\n"); 249 return -EINVAL; 250 } 251 252 if (h1->bLength < sizeof(*h1) + h1->bInCollection) { 253 snd_printk(KERN_ERR "invalid UAC_HEADER (v1)\n"); 254 return -EINVAL; 255 } 256 257 for (i = 0; i < h1->bInCollection; i++) 258 snd_usb_create_stream(chip, ctrlif, h1->baInterfaceNr[i]); 259 260 break; 261 } 262 263 case UAC_VERSION_2: { 264 struct usb_interface_assoc_descriptor *assoc = 265 usb_ifnum_to_if(dev, ctrlif)->intf_assoc; 266 267 if (!assoc) { 268 /* 269 * Firmware writers cannot count to three. So to find 270 * the IAD on the NuForce UDH-100, also check the next 271 * interface. 272 */ 273 struct usb_interface *iface = 274 usb_ifnum_to_if(dev, ctrlif + 1); 275 if (iface && 276 iface->intf_assoc && 277 iface->intf_assoc->bFunctionClass == USB_CLASS_AUDIO && 278 iface->intf_assoc->bFunctionProtocol == UAC_VERSION_2) 279 assoc = iface->intf_assoc; 280 } 281 282 if (!assoc) { 283 snd_printk(KERN_ERR "Audio class v2 interfaces need an interface association\n"); 284 return -EINVAL; 285 } 286 287 for (i = 0; i < assoc->bInterfaceCount; i++) { 288 int intf = assoc->bFirstInterface + i; 289 290 if (intf != ctrlif) 291 snd_usb_create_stream(chip, ctrlif, intf); 292 } 293 294 break; 295 } 296 } 297 298 return 0; 299 } 300 301 /* 302 * free the chip instance 303 * 304 * here we have to do not much, since pcm and controls are already freed 305 * 306 */ 307 308 static int snd_usb_audio_free(struct snd_usb_audio *chip) 309 { 310 mutex_destroy(&chip->mutex); 311 kfree(chip); 312 return 0; 313 } 314 315 static int snd_usb_audio_dev_free(struct snd_device *device) 316 { 317 struct snd_usb_audio *chip = device->device_data; 318 return snd_usb_audio_free(chip); 319 } 320 321 static void remove_trailing_spaces(char *str) 322 { 323 char *p; 324 325 if (!*str) 326 return; 327 for (p = str + strlen(str) - 1; p >= str && isspace(*p); p--) 328 *p = 0; 329 } 330 331 /* 332 * create a chip instance and set its names. 333 */ 334 static int snd_usb_audio_create(struct usb_device *dev, int idx, 335 const struct snd_usb_audio_quirk *quirk, 336 struct snd_usb_audio **rchip) 337 { 338 struct snd_card *card; 339 struct snd_usb_audio *chip; 340 int err, len; 341 char component[14]; 342 static struct snd_device_ops ops = { 343 .dev_free = snd_usb_audio_dev_free, 344 }; 345 346 *rchip = NULL; 347 348 switch (snd_usb_get_speed(dev)) { 349 case USB_SPEED_LOW: 350 case USB_SPEED_FULL: 351 case USB_SPEED_HIGH: 352 case USB_SPEED_SUPER: 353 break; 354 default: 355 snd_printk(KERN_ERR "unknown device speed %d\n", snd_usb_get_speed(dev)); 356 return -ENXIO; 357 } 358 359 err = snd_card_create(index[idx], id[idx], THIS_MODULE, 0, &card); 360 if (err < 0) { 361 snd_printk(KERN_ERR "cannot create card instance %d\n", idx); 362 return err; 363 } 364 365 chip = kzalloc(sizeof(*chip), GFP_KERNEL); 366 if (! chip) { 367 snd_card_free(card); 368 return -ENOMEM; 369 } 370 371 mutex_init(&chip->mutex); 372 init_rwsem(&chip->shutdown_rwsem); 373 chip->index = idx; 374 chip->dev = dev; 375 chip->card = card; 376 chip->setup = device_setup[idx]; 377 chip->nrpacks = nrpacks; 378 chip->autoclock = autoclock; 379 chip->probing = 1; 380 381 chip->usb_id = USB_ID(le16_to_cpu(dev->descriptor.idVendor), 382 le16_to_cpu(dev->descriptor.idProduct)); 383 INIT_LIST_HEAD(&chip->pcm_list); 384 INIT_LIST_HEAD(&chip->ep_list); 385 INIT_LIST_HEAD(&chip->midi_list); 386 INIT_LIST_HEAD(&chip->mixer_list); 387 388 if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) { 389 snd_usb_audio_free(chip); 390 snd_card_free(card); 391 return err; 392 } 393 394 strcpy(card->driver, "USB-Audio"); 395 sprintf(component, "USB%04x:%04x", 396 USB_ID_VENDOR(chip->usb_id), USB_ID_PRODUCT(chip->usb_id)); 397 snd_component_add(card, component); 398 399 /* retrieve the device string as shortname */ 400 if (quirk && quirk->product_name && *quirk->product_name) { 401 strlcpy(card->shortname, quirk->product_name, sizeof(card->shortname)); 402 } else { 403 if (!dev->descriptor.iProduct || 404 usb_string(dev, dev->descriptor.iProduct, 405 card->shortname, sizeof(card->shortname)) <= 0) { 406 /* no name available from anywhere, so use ID */ 407 sprintf(card->shortname, "USB Device %#04x:%#04x", 408 USB_ID_VENDOR(chip->usb_id), 409 USB_ID_PRODUCT(chip->usb_id)); 410 } 411 } 412 remove_trailing_spaces(card->shortname); 413 414 /* retrieve the vendor and device strings as longname */ 415 if (quirk && quirk->vendor_name && *quirk->vendor_name) { 416 len = strlcpy(card->longname, quirk->vendor_name, sizeof(card->longname)); 417 } else { 418 if (dev->descriptor.iManufacturer) 419 len = usb_string(dev, dev->descriptor.iManufacturer, 420 card->longname, sizeof(card->longname)); 421 else 422 len = 0; 423 /* we don't really care if there isn't any vendor string */ 424 } 425 if (len > 0) { 426 remove_trailing_spaces(card->longname); 427 if (*card->longname) 428 strlcat(card->longname, " ", sizeof(card->longname)); 429 } 430 431 strlcat(card->longname, card->shortname, sizeof(card->longname)); 432 433 len = strlcat(card->longname, " at ", sizeof(card->longname)); 434 435 if (len < sizeof(card->longname)) 436 usb_make_path(dev, card->longname + len, sizeof(card->longname) - len); 437 438 switch (snd_usb_get_speed(dev)) { 439 case USB_SPEED_LOW: 440 strlcat(card->longname, ", low speed", sizeof(card->longname)); 441 break; 442 case USB_SPEED_FULL: 443 strlcat(card->longname, ", full speed", sizeof(card->longname)); 444 break; 445 case USB_SPEED_HIGH: 446 strlcat(card->longname, ", high speed", sizeof(card->longname)); 447 break; 448 case USB_SPEED_SUPER: 449 strlcat(card->longname, ", super speed", sizeof(card->longname)); 450 break; 451 default: 452 break; 453 } 454 455 snd_usb_audio_create_proc(chip); 456 457 *rchip = chip; 458 return 0; 459 } 460 461 /* 462 * probe the active usb device 463 * 464 * note that this can be called multiple times per a device, when it 465 * includes multiple audio control interfaces. 466 * 467 * thus we check the usb device pointer and creates the card instance 468 * only at the first time. the successive calls of this function will 469 * append the pcm interface to the corresponding card. 470 */ 471 static struct snd_usb_audio * 472 snd_usb_audio_probe(struct usb_device *dev, 473 struct usb_interface *intf, 474 const struct usb_device_id *usb_id) 475 { 476 const struct snd_usb_audio_quirk *quirk = (const struct snd_usb_audio_quirk *)usb_id->driver_info; 477 int i, err; 478 struct snd_usb_audio *chip; 479 struct usb_host_interface *alts; 480 int ifnum; 481 u32 id; 482 483 alts = &intf->altsetting[0]; 484 ifnum = get_iface_desc(alts)->bInterfaceNumber; 485 id = USB_ID(le16_to_cpu(dev->descriptor.idVendor), 486 le16_to_cpu(dev->descriptor.idProduct)); 487 if (quirk && quirk->ifnum >= 0 && ifnum != quirk->ifnum) 488 goto __err_val; 489 490 if (snd_usb_apply_boot_quirk(dev, intf, quirk) < 0) 491 goto __err_val; 492 493 /* 494 * found a config. now register to ALSA 495 */ 496 497 /* check whether it's already registered */ 498 chip = NULL; 499 mutex_lock(®ister_mutex); 500 for (i = 0; i < SNDRV_CARDS; i++) { 501 if (usb_chip[i] && usb_chip[i]->dev == dev) { 502 if (usb_chip[i]->shutdown) { 503 snd_printk(KERN_ERR "USB device is in the shutdown state, cannot create a card instance\n"); 504 goto __error; 505 } 506 chip = usb_chip[i]; 507 chip->probing = 1; 508 break; 509 } 510 } 511 if (! chip) { 512 /* it's a fresh one. 513 * now look for an empty slot and create a new card instance 514 */ 515 for (i = 0; i < SNDRV_CARDS; i++) 516 if (enable[i] && ! usb_chip[i] && 517 (vid[i] == -1 || vid[i] == USB_ID_VENDOR(id)) && 518 (pid[i] == -1 || pid[i] == USB_ID_PRODUCT(id))) { 519 if (snd_usb_audio_create(dev, i, quirk, &chip) < 0) { 520 goto __error; 521 } 522 snd_card_set_dev(chip->card, &intf->dev); 523 chip->pm_intf = intf; 524 break; 525 } 526 if (!chip) { 527 printk(KERN_ERR "no available usb audio device\n"); 528 goto __error; 529 } 530 } 531 532 /* 533 * For devices with more than one control interface, we assume the 534 * first contains the audio controls. We might need a more specific 535 * check here in the future. 536 */ 537 if (!chip->ctrl_intf) 538 chip->ctrl_intf = alts; 539 540 chip->txfr_quirk = 0; 541 err = 1; /* continue */ 542 if (quirk && quirk->ifnum != QUIRK_NO_INTERFACE) { 543 /* need some special handlings */ 544 if ((err = snd_usb_create_quirk(chip, intf, &usb_audio_driver, quirk)) < 0) 545 goto __error; 546 } 547 548 if (err > 0) { 549 /* create normal USB audio interfaces */ 550 if (snd_usb_create_streams(chip, ifnum) < 0 || 551 snd_usb_create_mixer(chip, ifnum, ignore_ctl_error) < 0) { 552 goto __error; 553 } 554 } 555 556 /* we are allowed to call snd_card_register() many times */ 557 if (snd_card_register(chip->card) < 0) { 558 goto __error; 559 } 560 561 usb_chip[chip->index] = chip; 562 chip->num_interfaces++; 563 chip->probing = 0; 564 mutex_unlock(®ister_mutex); 565 return chip; 566 567 __error: 568 if (chip) { 569 if (!chip->num_interfaces) 570 snd_card_free(chip->card); 571 chip->probing = 0; 572 } 573 mutex_unlock(®ister_mutex); 574 __err_val: 575 return NULL; 576 } 577 578 /* 579 * we need to take care of counter, since disconnection can be called also 580 * many times as well as usb_audio_probe(). 581 */ 582 static void snd_usb_audio_disconnect(struct usb_device *dev, 583 struct snd_usb_audio *chip) 584 { 585 struct snd_card *card; 586 struct list_head *p, *n; 587 588 if (chip == (void *)-1L) 589 return; 590 591 card = chip->card; 592 down_write(&chip->shutdown_rwsem); 593 chip->shutdown = 1; 594 up_write(&chip->shutdown_rwsem); 595 596 mutex_lock(®ister_mutex); 597 chip->num_interfaces--; 598 if (chip->num_interfaces <= 0) { 599 snd_card_disconnect(card); 600 /* release the pcm resources */ 601 list_for_each(p, &chip->pcm_list) { 602 snd_usb_stream_disconnect(p); 603 } 604 /* release the endpoint resources */ 605 list_for_each_safe(p, n, &chip->ep_list) { 606 snd_usb_endpoint_free(p); 607 } 608 /* release the midi resources */ 609 list_for_each(p, &chip->midi_list) { 610 snd_usbmidi_disconnect(p); 611 } 612 /* release mixer resources */ 613 list_for_each(p, &chip->mixer_list) { 614 snd_usb_mixer_disconnect(p); 615 } 616 usb_chip[chip->index] = NULL; 617 mutex_unlock(®ister_mutex); 618 snd_card_free_when_closed(card); 619 } else { 620 mutex_unlock(®ister_mutex); 621 } 622 } 623 624 /* 625 * new 2.5 USB kernel API 626 */ 627 static int usb_audio_probe(struct usb_interface *intf, 628 const struct usb_device_id *id) 629 { 630 struct snd_usb_audio *chip; 631 chip = snd_usb_audio_probe(interface_to_usbdev(intf), intf, id); 632 if (chip) { 633 usb_set_intfdata(intf, chip); 634 return 0; 635 } else 636 return -EIO; 637 } 638 639 static void usb_audio_disconnect(struct usb_interface *intf) 640 { 641 snd_usb_audio_disconnect(interface_to_usbdev(intf), 642 usb_get_intfdata(intf)); 643 } 644 645 #ifdef CONFIG_PM 646 647 int snd_usb_autoresume(struct snd_usb_audio *chip) 648 { 649 int err = -ENODEV; 650 651 down_read(&chip->shutdown_rwsem); 652 if (chip->probing) 653 err = 0; 654 else if (!chip->shutdown) 655 err = usb_autopm_get_interface(chip->pm_intf); 656 up_read(&chip->shutdown_rwsem); 657 658 return err; 659 } 660 661 void snd_usb_autosuspend(struct snd_usb_audio *chip) 662 { 663 down_read(&chip->shutdown_rwsem); 664 if (!chip->shutdown && !chip->probing) 665 usb_autopm_put_interface(chip->pm_intf); 666 up_read(&chip->shutdown_rwsem); 667 } 668 669 static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message) 670 { 671 struct snd_usb_audio *chip = usb_get_intfdata(intf); 672 struct snd_usb_stream *as; 673 struct usb_mixer_interface *mixer; 674 675 if (chip == (void *)-1L) 676 return 0; 677 678 if (!PMSG_IS_AUTO(message)) { 679 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot); 680 if (!chip->num_suspended_intf++) { 681 list_for_each_entry(as, &chip->pcm_list, list) { 682 snd_pcm_suspend_all(as->pcm); 683 as->substream[0].need_setup_ep = 684 as->substream[1].need_setup_ep = true; 685 } 686 } 687 } else { 688 /* 689 * otherwise we keep the rest of the system in the dark 690 * to keep this transparent 691 */ 692 if (!chip->num_suspended_intf++) 693 chip->autosuspended = 1; 694 } 695 696 list_for_each_entry(mixer, &chip->mixer_list, list) 697 snd_usb_mixer_inactivate(mixer); 698 699 return 0; 700 } 701 702 static int usb_audio_resume(struct usb_interface *intf) 703 { 704 struct snd_usb_audio *chip = usb_get_intfdata(intf); 705 struct usb_mixer_interface *mixer; 706 int err = 0; 707 708 if (chip == (void *)-1L) 709 return 0; 710 if (--chip->num_suspended_intf) 711 return 0; 712 /* 713 * ALSA leaves material resumption to user space 714 * we just notify and restart the mixers 715 */ 716 list_for_each_entry(mixer, &chip->mixer_list, list) { 717 err = snd_usb_mixer_activate(mixer); 718 if (err < 0) 719 goto err_out; 720 } 721 722 if (!chip->autosuspended) 723 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0); 724 chip->autosuspended = 0; 725 726 err_out: 727 return err; 728 } 729 #else 730 #define usb_audio_suspend NULL 731 #define usb_audio_resume NULL 732 #endif /* CONFIG_PM */ 733 734 static struct usb_device_id usb_audio_ids [] = { 735 #include "quirks-table.h" 736 { .match_flags = (USB_DEVICE_ID_MATCH_INT_CLASS | USB_DEVICE_ID_MATCH_INT_SUBCLASS), 737 .bInterfaceClass = USB_CLASS_AUDIO, 738 .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL }, 739 { } /* Terminating entry */ 740 }; 741 MODULE_DEVICE_TABLE(usb, usb_audio_ids); 742 743 /* 744 * entry point for linux usb interface 745 */ 746 747 static struct usb_driver usb_audio_driver = { 748 .name = "snd-usb-audio", 749 .probe = usb_audio_probe, 750 .disconnect = usb_audio_disconnect, 751 .suspend = usb_audio_suspend, 752 .resume = usb_audio_resume, 753 .id_table = usb_audio_ids, 754 .supports_autosuspend = 1, 755 }; 756 757 static int __init snd_usb_audio_init(void) 758 { 759 if (nrpacks < 1 || nrpacks > MAX_PACKS) { 760 printk(KERN_WARNING "invalid nrpacks value.\n"); 761 return -EINVAL; 762 } 763 return usb_register(&usb_audio_driver); 764 } 765 766 static void __exit snd_usb_audio_cleanup(void) 767 { 768 usb_deregister(&usb_audio_driver); 769 } 770 771 module_init(snd_usb_audio_init); 772 module_exit(snd_usb_audio_cleanup); 773