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 * Audio Class 3.0 support by Ruslan Bilovol <ruslan.bilovol@gmail.com> 11 * 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of the GNU General Public License as published by 14 * the Free Software Foundation; either version 2 of the License, or 15 * (at your option) any later version. 16 * 17 * This program is distributed in the hope that it will be useful, 18 * but WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20 * GNU General Public License for more details. 21 * 22 * You should have received a copy of the GNU General Public License 23 * along with this program; if not, write to the Free Software 24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 25 * 26 * 27 * NOTES: 28 * 29 * - the linked URBs would be preferred but not used so far because of 30 * the instability of unlinking. 31 * - type II is not supported properly. there is no device which supports 32 * this type *correctly*. SB extigy looks as if it supports, but it's 33 * indeed an AC3 stream packed in SPDIF frames (i.e. no real AC3 stream). 34 */ 35 36 37 #include <linux/bitops.h> 38 #include <linux/init.h> 39 #include <linux/list.h> 40 #include <linux/slab.h> 41 #include <linux/string.h> 42 #include <linux/ctype.h> 43 #include <linux/usb.h> 44 #include <linux/moduleparam.h> 45 #include <linux/mutex.h> 46 #include <linux/usb/audio.h> 47 #include <linux/usb/audio-v2.h> 48 #include <linux/usb/audio-v3.h> 49 #include <linux/module.h> 50 51 #include <sound/control.h> 52 #include <sound/core.h> 53 #include <sound/info.h> 54 #include <sound/pcm.h> 55 #include <sound/pcm_params.h> 56 #include <sound/initval.h> 57 58 #include "usbaudio.h" 59 #include "card.h" 60 #include "midi.h" 61 #include "mixer.h" 62 #include "proc.h" 63 #include "quirks.h" 64 #include "endpoint.h" 65 #include "helper.h" 66 #include "debug.h" 67 #include "pcm.h" 68 #include "format.h" 69 #include "power.h" 70 #include "stream.h" 71 72 MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>"); 73 MODULE_DESCRIPTION("USB Audio"); 74 MODULE_LICENSE("GPL"); 75 MODULE_SUPPORTED_DEVICE("{{Generic,USB Audio}}"); 76 77 78 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */ 79 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */ 80 static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;/* Enable this card */ 81 /* Vendor/product IDs for this card */ 82 static int vid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 }; 83 static int pid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 }; 84 static int device_setup[SNDRV_CARDS]; /* device parameter for this card */ 85 static bool ignore_ctl_error; 86 static bool autoclock = true; 87 static char *quirk_alias[SNDRV_CARDS]; 88 89 bool snd_usb_use_vmalloc = true; 90 91 module_param_array(index, int, NULL, 0444); 92 MODULE_PARM_DESC(index, "Index value for the USB audio adapter."); 93 module_param_array(id, charp, NULL, 0444); 94 MODULE_PARM_DESC(id, "ID string for the USB audio adapter."); 95 module_param_array(enable, bool, NULL, 0444); 96 MODULE_PARM_DESC(enable, "Enable USB audio adapter."); 97 module_param_array(vid, int, NULL, 0444); 98 MODULE_PARM_DESC(vid, "Vendor ID for the USB audio device."); 99 module_param_array(pid, int, NULL, 0444); 100 MODULE_PARM_DESC(pid, "Product ID for the USB audio device."); 101 module_param_array(device_setup, int, NULL, 0444); 102 MODULE_PARM_DESC(device_setup, "Specific device setup (if needed)."); 103 module_param(ignore_ctl_error, bool, 0444); 104 MODULE_PARM_DESC(ignore_ctl_error, 105 "Ignore errors from USB controller for mixer interfaces."); 106 module_param(autoclock, bool, 0444); 107 MODULE_PARM_DESC(autoclock, "Enable auto-clock selection for UAC2 devices (default: yes)."); 108 module_param_array(quirk_alias, charp, NULL, 0444); 109 MODULE_PARM_DESC(quirk_alias, "Quirk aliases, e.g. 0123abcd:5678beef."); 110 module_param_named(use_vmalloc, snd_usb_use_vmalloc, bool, 0444); 111 MODULE_PARM_DESC(use_vmalloc, "Use vmalloc for PCM intermediate buffers (default: yes)."); 112 113 /* 114 * we keep the snd_usb_audio_t instances by ourselves for merging 115 * the all interfaces on the same card as one sound device. 116 */ 117 118 static DEFINE_MUTEX(register_mutex); 119 static struct snd_usb_audio *usb_chip[SNDRV_CARDS]; 120 static struct usb_driver usb_audio_driver; 121 122 /* 123 * disconnect streams 124 * called from usb_audio_disconnect() 125 */ 126 static void snd_usb_stream_disconnect(struct snd_usb_stream *as) 127 { 128 int idx; 129 struct snd_usb_substream *subs; 130 131 for (idx = 0; idx < 2; idx++) { 132 subs = &as->substream[idx]; 133 if (!subs->num_formats) 134 continue; 135 subs->interface = -1; 136 subs->data_endpoint = NULL; 137 subs->sync_endpoint = NULL; 138 } 139 } 140 141 static int snd_usb_create_stream(struct snd_usb_audio *chip, int ctrlif, int interface) 142 { 143 struct usb_device *dev = chip->dev; 144 struct usb_host_interface *alts; 145 struct usb_interface_descriptor *altsd; 146 struct usb_interface *iface = usb_ifnum_to_if(dev, interface); 147 148 if (!iface) { 149 dev_err(&dev->dev, "%u:%d : does not exist\n", 150 ctrlif, interface); 151 return -EINVAL; 152 } 153 154 alts = &iface->altsetting[0]; 155 altsd = get_iface_desc(alts); 156 157 /* 158 * Android with both accessory and audio interfaces enabled gets the 159 * interface numbers wrong. 160 */ 161 if ((chip->usb_id == USB_ID(0x18d1, 0x2d04) || 162 chip->usb_id == USB_ID(0x18d1, 0x2d05)) && 163 interface == 0 && 164 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC && 165 altsd->bInterfaceSubClass == USB_SUBCLASS_VENDOR_SPEC) { 166 interface = 2; 167 iface = usb_ifnum_to_if(dev, interface); 168 if (!iface) 169 return -EINVAL; 170 alts = &iface->altsetting[0]; 171 altsd = get_iface_desc(alts); 172 } 173 174 if (usb_interface_claimed(iface)) { 175 dev_dbg(&dev->dev, "%d:%d: skipping, already claimed\n", 176 ctrlif, interface); 177 return -EINVAL; 178 } 179 180 if ((altsd->bInterfaceClass == USB_CLASS_AUDIO || 181 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC) && 182 altsd->bInterfaceSubClass == USB_SUBCLASS_MIDISTREAMING) { 183 int err = __snd_usbmidi_create(chip->card, iface, 184 &chip->midi_list, NULL, 185 chip->usb_id); 186 if (err < 0) { 187 dev_err(&dev->dev, 188 "%u:%d: cannot create sequencer device\n", 189 ctrlif, interface); 190 return -EINVAL; 191 } 192 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L); 193 194 return 0; 195 } 196 197 if ((altsd->bInterfaceClass != USB_CLASS_AUDIO && 198 altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) || 199 altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING) { 200 dev_dbg(&dev->dev, 201 "%u:%d: skipping non-supported interface %d\n", 202 ctrlif, interface, altsd->bInterfaceClass); 203 /* skip non-supported classes */ 204 return -EINVAL; 205 } 206 207 if (snd_usb_get_speed(dev) == USB_SPEED_LOW) { 208 dev_err(&dev->dev, "low speed audio streaming not supported\n"); 209 return -EINVAL; 210 } 211 212 if (! snd_usb_parse_audio_interface(chip, interface)) { 213 usb_set_interface(dev, interface, 0); /* reset the current interface */ 214 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L); 215 } 216 217 return 0; 218 } 219 220 /* 221 * parse audio control descriptor and create pcm/midi streams 222 */ 223 static int snd_usb_create_streams(struct snd_usb_audio *chip, int ctrlif) 224 { 225 struct usb_device *dev = chip->dev; 226 struct usb_host_interface *host_iface; 227 struct usb_interface_descriptor *altsd; 228 int i, protocol; 229 230 /* find audiocontrol interface */ 231 host_iface = &usb_ifnum_to_if(dev, ctrlif)->altsetting[0]; 232 altsd = get_iface_desc(host_iface); 233 protocol = altsd->bInterfaceProtocol; 234 235 switch (protocol) { 236 default: 237 dev_warn(&dev->dev, 238 "unknown interface protocol %#02x, assuming v1\n", 239 protocol); 240 /* fall through */ 241 242 case UAC_VERSION_1: { 243 struct uac1_ac_header_descriptor *h1; 244 int rest_bytes; 245 246 h1 = snd_usb_find_csint_desc(host_iface->extra, 247 host_iface->extralen, 248 NULL, UAC_HEADER); 249 if (!h1) { 250 dev_err(&dev->dev, "cannot find UAC_HEADER\n"); 251 return -EINVAL; 252 } 253 254 rest_bytes = (void *)(host_iface->extra + 255 host_iface->extralen) - (void *)h1; 256 257 /* just to be sure -- this shouldn't hit at all */ 258 if (rest_bytes <= 0) { 259 dev_err(&dev->dev, "invalid control header\n"); 260 return -EINVAL; 261 } 262 263 if (rest_bytes < sizeof(*h1)) { 264 dev_err(&dev->dev, "too short v1 buffer descriptor\n"); 265 return -EINVAL; 266 } 267 268 if (!h1->bInCollection) { 269 dev_info(&dev->dev, "skipping empty audio interface (v1)\n"); 270 return -EINVAL; 271 } 272 273 if (rest_bytes < h1->bLength) { 274 dev_err(&dev->dev, "invalid buffer length (v1)\n"); 275 return -EINVAL; 276 } 277 278 if (h1->bLength < sizeof(*h1) + h1->bInCollection) { 279 dev_err(&dev->dev, "invalid UAC_HEADER (v1)\n"); 280 return -EINVAL; 281 } 282 283 for (i = 0; i < h1->bInCollection; i++) 284 snd_usb_create_stream(chip, ctrlif, h1->baInterfaceNr[i]); 285 286 break; 287 } 288 289 case UAC_VERSION_2: 290 case UAC_VERSION_3: { 291 struct usb_interface_assoc_descriptor *assoc = 292 usb_ifnum_to_if(dev, ctrlif)->intf_assoc; 293 294 if (!assoc) { 295 /* 296 * Firmware writers cannot count to three. So to find 297 * the IAD on the NuForce UDH-100, also check the next 298 * interface. 299 */ 300 struct usb_interface *iface = 301 usb_ifnum_to_if(dev, ctrlif + 1); 302 if (iface && 303 iface->intf_assoc && 304 iface->intf_assoc->bFunctionClass == USB_CLASS_AUDIO && 305 iface->intf_assoc->bFunctionProtocol == UAC_VERSION_2) 306 assoc = iface->intf_assoc; 307 } 308 309 if (!assoc) { 310 dev_err(&dev->dev, "Audio class v2/v3 interfaces need an interface association\n"); 311 return -EINVAL; 312 } 313 314 if (protocol == UAC_VERSION_3) { 315 int badd = assoc->bFunctionSubClass; 316 317 if (badd != UAC3_FUNCTION_SUBCLASS_FULL_ADC_3_0 && 318 (badd < UAC3_FUNCTION_SUBCLASS_GENERIC_IO || 319 badd > UAC3_FUNCTION_SUBCLASS_SPEAKERPHONE)) { 320 dev_err(&dev->dev, 321 "Unsupported UAC3 BADD profile\n"); 322 return -EINVAL; 323 } 324 325 chip->badd_profile = badd; 326 } 327 328 for (i = 0; i < assoc->bInterfaceCount; i++) { 329 int intf = assoc->bFirstInterface + i; 330 331 if (intf != ctrlif) 332 snd_usb_create_stream(chip, ctrlif, intf); 333 } 334 335 break; 336 } 337 } 338 339 return 0; 340 } 341 342 /* 343 * free the chip instance 344 * 345 * here we have to do not much, since pcm and controls are already freed 346 * 347 */ 348 349 static void snd_usb_audio_free(struct snd_card *card) 350 { 351 struct snd_usb_audio *chip = card->private_data; 352 struct snd_usb_endpoint *ep, *n; 353 354 list_for_each_entry_safe(ep, n, &chip->ep_list, list) 355 snd_usb_endpoint_free(ep); 356 357 mutex_destroy(&chip->mutex); 358 if (!atomic_read(&chip->shutdown)) 359 dev_set_drvdata(&chip->dev->dev, NULL); 360 } 361 362 static void usb_audio_make_shortname(struct usb_device *dev, 363 struct snd_usb_audio *chip, 364 const struct snd_usb_audio_quirk *quirk) 365 { 366 struct snd_card *card = chip->card; 367 368 if (quirk && quirk->product_name && *quirk->product_name) { 369 strlcpy(card->shortname, quirk->product_name, 370 sizeof(card->shortname)); 371 return; 372 } 373 374 /* retrieve the device string as shortname */ 375 if (!dev->descriptor.iProduct || 376 usb_string(dev, dev->descriptor.iProduct, 377 card->shortname, sizeof(card->shortname)) <= 0) { 378 /* no name available from anywhere, so use ID */ 379 sprintf(card->shortname, "USB Device %#04x:%#04x", 380 USB_ID_VENDOR(chip->usb_id), 381 USB_ID_PRODUCT(chip->usb_id)); 382 } 383 384 strim(card->shortname); 385 } 386 387 static void usb_audio_make_longname(struct usb_device *dev, 388 struct snd_usb_audio *chip, 389 const struct snd_usb_audio_quirk *quirk) 390 { 391 struct snd_card *card = chip->card; 392 int len; 393 394 /* shortcut - if any pre-defined string is given, use it */ 395 if (quirk && quirk->profile_name && *quirk->profile_name) { 396 strlcpy(card->longname, quirk->profile_name, 397 sizeof(card->longname)); 398 return; 399 } 400 401 if (quirk && quirk->vendor_name && *quirk->vendor_name) { 402 len = strlcpy(card->longname, quirk->vendor_name, sizeof(card->longname)); 403 } else { 404 /* retrieve the vendor and device strings as longname */ 405 if (dev->descriptor.iManufacturer) 406 len = usb_string(dev, dev->descriptor.iManufacturer, 407 card->longname, sizeof(card->longname)); 408 else 409 len = 0; 410 /* we don't really care if there isn't any vendor string */ 411 } 412 if (len > 0) { 413 strim(card->longname); 414 if (*card->longname) 415 strlcat(card->longname, " ", sizeof(card->longname)); 416 } 417 418 strlcat(card->longname, card->shortname, sizeof(card->longname)); 419 420 len = strlcat(card->longname, " at ", sizeof(card->longname)); 421 422 if (len < sizeof(card->longname)) 423 usb_make_path(dev, card->longname + len, sizeof(card->longname) - len); 424 425 switch (snd_usb_get_speed(dev)) { 426 case USB_SPEED_LOW: 427 strlcat(card->longname, ", low speed", sizeof(card->longname)); 428 break; 429 case USB_SPEED_FULL: 430 strlcat(card->longname, ", full speed", sizeof(card->longname)); 431 break; 432 case USB_SPEED_HIGH: 433 strlcat(card->longname, ", high speed", sizeof(card->longname)); 434 break; 435 case USB_SPEED_SUPER: 436 strlcat(card->longname, ", super speed", sizeof(card->longname)); 437 break; 438 case USB_SPEED_SUPER_PLUS: 439 strlcat(card->longname, ", super speed plus", sizeof(card->longname)); 440 break; 441 default: 442 break; 443 } 444 } 445 446 /* 447 * create a chip instance and set its names. 448 */ 449 static int snd_usb_audio_create(struct usb_interface *intf, 450 struct usb_device *dev, int idx, 451 const struct snd_usb_audio_quirk *quirk, 452 unsigned int usb_id, 453 struct snd_usb_audio **rchip) 454 { 455 struct snd_card *card; 456 struct snd_usb_audio *chip; 457 int err; 458 char component[14]; 459 460 *rchip = NULL; 461 462 switch (snd_usb_get_speed(dev)) { 463 case USB_SPEED_LOW: 464 case USB_SPEED_FULL: 465 case USB_SPEED_HIGH: 466 case USB_SPEED_WIRELESS: 467 case USB_SPEED_SUPER: 468 case USB_SPEED_SUPER_PLUS: 469 break; 470 default: 471 dev_err(&dev->dev, "unknown device speed %d\n", snd_usb_get_speed(dev)); 472 return -ENXIO; 473 } 474 475 err = snd_card_new(&intf->dev, index[idx], id[idx], THIS_MODULE, 476 sizeof(*chip), &card); 477 if (err < 0) { 478 dev_err(&dev->dev, "cannot create card instance %d\n", idx); 479 return err; 480 } 481 482 chip = card->private_data; 483 mutex_init(&chip->mutex); 484 init_waitqueue_head(&chip->shutdown_wait); 485 chip->index = idx; 486 chip->dev = dev; 487 chip->card = card; 488 chip->setup = device_setup[idx]; 489 chip->autoclock = autoclock; 490 atomic_set(&chip->active, 1); /* avoid autopm during probing */ 491 atomic_set(&chip->usage_count, 0); 492 atomic_set(&chip->shutdown, 0); 493 494 chip->usb_id = usb_id; 495 INIT_LIST_HEAD(&chip->pcm_list); 496 INIT_LIST_HEAD(&chip->ep_list); 497 INIT_LIST_HEAD(&chip->midi_list); 498 INIT_LIST_HEAD(&chip->mixer_list); 499 500 card->private_free = snd_usb_audio_free; 501 502 strcpy(card->driver, "USB-Audio"); 503 sprintf(component, "USB%04x:%04x", 504 USB_ID_VENDOR(chip->usb_id), USB_ID_PRODUCT(chip->usb_id)); 505 snd_component_add(card, component); 506 507 usb_audio_make_shortname(dev, chip, quirk); 508 usb_audio_make_longname(dev, chip, quirk); 509 510 snd_usb_audio_create_proc(chip); 511 512 *rchip = chip; 513 return 0; 514 } 515 516 /* look for a matching quirk alias id */ 517 static bool get_alias_id(struct usb_device *dev, unsigned int *id) 518 { 519 int i; 520 unsigned int src, dst; 521 522 for (i = 0; i < ARRAY_SIZE(quirk_alias); i++) { 523 if (!quirk_alias[i] || 524 sscanf(quirk_alias[i], "%x:%x", &src, &dst) != 2 || 525 src != *id) 526 continue; 527 dev_info(&dev->dev, 528 "device (%04x:%04x): applying quirk alias %04x:%04x\n", 529 USB_ID_VENDOR(*id), USB_ID_PRODUCT(*id), 530 USB_ID_VENDOR(dst), USB_ID_PRODUCT(dst)); 531 *id = dst; 532 return true; 533 } 534 535 return false; 536 } 537 538 static const struct usb_device_id usb_audio_ids[]; /* defined below */ 539 540 /* look for the corresponding quirk */ 541 static const struct snd_usb_audio_quirk * 542 get_alias_quirk(struct usb_device *dev, unsigned int id) 543 { 544 const struct usb_device_id *p; 545 546 for (p = usb_audio_ids; p->match_flags; p++) { 547 /* FIXME: this checks only vendor:product pair in the list */ 548 if ((p->match_flags & USB_DEVICE_ID_MATCH_DEVICE) == 549 USB_DEVICE_ID_MATCH_DEVICE && 550 p->idVendor == USB_ID_VENDOR(id) && 551 p->idProduct == USB_ID_PRODUCT(id)) 552 return (const struct snd_usb_audio_quirk *)p->driver_info; 553 } 554 555 return NULL; 556 } 557 558 /* 559 * probe the active usb device 560 * 561 * note that this can be called multiple times per a device, when it 562 * includes multiple audio control interfaces. 563 * 564 * thus we check the usb device pointer and creates the card instance 565 * only at the first time. the successive calls of this function will 566 * append the pcm interface to the corresponding card. 567 */ 568 static int usb_audio_probe(struct usb_interface *intf, 569 const struct usb_device_id *usb_id) 570 { 571 struct usb_device *dev = interface_to_usbdev(intf); 572 const struct snd_usb_audio_quirk *quirk = 573 (const struct snd_usb_audio_quirk *)usb_id->driver_info; 574 struct snd_usb_audio *chip; 575 int i, err; 576 struct usb_host_interface *alts; 577 int ifnum; 578 u32 id; 579 580 alts = &intf->altsetting[0]; 581 ifnum = get_iface_desc(alts)->bInterfaceNumber; 582 id = USB_ID(le16_to_cpu(dev->descriptor.idVendor), 583 le16_to_cpu(dev->descriptor.idProduct)); 584 if (get_alias_id(dev, &id)) 585 quirk = get_alias_quirk(dev, id); 586 if (quirk && quirk->ifnum >= 0 && ifnum != quirk->ifnum) 587 return -ENXIO; 588 589 err = snd_usb_apply_boot_quirk(dev, intf, quirk, id); 590 if (err < 0) 591 return err; 592 593 /* 594 * found a config. now register to ALSA 595 */ 596 597 /* check whether it's already registered */ 598 chip = NULL; 599 mutex_lock(®ister_mutex); 600 for (i = 0; i < SNDRV_CARDS; i++) { 601 if (usb_chip[i] && usb_chip[i]->dev == dev) { 602 if (atomic_read(&usb_chip[i]->shutdown)) { 603 dev_err(&dev->dev, "USB device is in the shutdown state, cannot create a card instance\n"); 604 err = -EIO; 605 goto __error; 606 } 607 chip = usb_chip[i]; 608 atomic_inc(&chip->active); /* avoid autopm */ 609 break; 610 } 611 } 612 if (! chip) { 613 /* it's a fresh one. 614 * now look for an empty slot and create a new card instance 615 */ 616 for (i = 0; i < SNDRV_CARDS; i++) 617 if (!usb_chip[i] && 618 (vid[i] == -1 || vid[i] == USB_ID_VENDOR(id)) && 619 (pid[i] == -1 || pid[i] == USB_ID_PRODUCT(id))) { 620 if (enable[i]) { 621 err = snd_usb_audio_create(intf, dev, i, quirk, 622 id, &chip); 623 if (err < 0) 624 goto __error; 625 chip->pm_intf = intf; 626 break; 627 } else if (vid[i] != -1 || pid[i] != -1) { 628 dev_info(&dev->dev, 629 "device (%04x:%04x) is disabled\n", 630 USB_ID_VENDOR(id), 631 USB_ID_PRODUCT(id)); 632 err = -ENOENT; 633 goto __error; 634 } 635 } 636 if (!chip) { 637 dev_err(&dev->dev, "no available usb audio device\n"); 638 err = -ENODEV; 639 goto __error; 640 } 641 } 642 dev_set_drvdata(&dev->dev, chip); 643 644 /* 645 * For devices with more than one control interface, we assume the 646 * first contains the audio controls. We might need a more specific 647 * check here in the future. 648 */ 649 if (!chip->ctrl_intf) 650 chip->ctrl_intf = alts; 651 652 chip->txfr_quirk = 0; 653 err = 1; /* continue */ 654 if (quirk && quirk->ifnum != QUIRK_NO_INTERFACE) { 655 /* need some special handlings */ 656 err = snd_usb_create_quirk(chip, intf, &usb_audio_driver, quirk); 657 if (err < 0) 658 goto __error; 659 } 660 661 if (err > 0) { 662 /* create normal USB audio interfaces */ 663 err = snd_usb_create_streams(chip, ifnum); 664 if (err < 0) 665 goto __error; 666 err = snd_usb_create_mixer(chip, ifnum, ignore_ctl_error); 667 if (err < 0) 668 goto __error; 669 } 670 671 /* we are allowed to call snd_card_register() many times */ 672 err = snd_card_register(chip->card); 673 if (err < 0) 674 goto __error; 675 676 usb_chip[chip->index] = chip; 677 chip->num_interfaces++; 678 usb_set_intfdata(intf, chip); 679 atomic_dec(&chip->active); 680 mutex_unlock(®ister_mutex); 681 return 0; 682 683 __error: 684 if (chip) { 685 if (!chip->num_interfaces) 686 snd_card_free(chip->card); 687 atomic_dec(&chip->active); 688 } 689 mutex_unlock(®ister_mutex); 690 return err; 691 } 692 693 /* 694 * we need to take care of counter, since disconnection can be called also 695 * many times as well as usb_audio_probe(). 696 */ 697 static void usb_audio_disconnect(struct usb_interface *intf) 698 { 699 struct snd_usb_audio *chip = usb_get_intfdata(intf); 700 struct snd_card *card; 701 struct list_head *p; 702 703 if (chip == (void *)-1L) 704 return; 705 706 card = chip->card; 707 708 mutex_lock(®ister_mutex); 709 if (atomic_inc_return(&chip->shutdown) == 1) { 710 struct snd_usb_stream *as; 711 struct snd_usb_endpoint *ep; 712 struct usb_mixer_interface *mixer; 713 714 /* wait until all pending tasks done; 715 * they are protected by snd_usb_lock_shutdown() 716 */ 717 wait_event(chip->shutdown_wait, 718 !atomic_read(&chip->usage_count)); 719 snd_card_disconnect(card); 720 /* release the pcm resources */ 721 list_for_each_entry(as, &chip->pcm_list, list) { 722 snd_usb_stream_disconnect(as); 723 } 724 /* release the endpoint resources */ 725 list_for_each_entry(ep, &chip->ep_list, list) { 726 snd_usb_endpoint_release(ep); 727 } 728 /* release the midi resources */ 729 list_for_each(p, &chip->midi_list) { 730 snd_usbmidi_disconnect(p); 731 } 732 /* release mixer resources */ 733 list_for_each_entry(mixer, &chip->mixer_list, list) { 734 snd_usb_mixer_disconnect(mixer); 735 } 736 } 737 738 chip->num_interfaces--; 739 if (chip->num_interfaces <= 0) { 740 usb_chip[chip->index] = NULL; 741 mutex_unlock(®ister_mutex); 742 snd_card_free_when_closed(card); 743 } else { 744 mutex_unlock(®ister_mutex); 745 } 746 } 747 748 /* lock the shutdown (disconnect) task and autoresume */ 749 int snd_usb_lock_shutdown(struct snd_usb_audio *chip) 750 { 751 int err; 752 753 atomic_inc(&chip->usage_count); 754 if (atomic_read(&chip->shutdown)) { 755 err = -EIO; 756 goto error; 757 } 758 err = snd_usb_autoresume(chip); 759 if (err < 0) 760 goto error; 761 return 0; 762 763 error: 764 if (atomic_dec_and_test(&chip->usage_count)) 765 wake_up(&chip->shutdown_wait); 766 return err; 767 } 768 769 /* autosuspend and unlock the shutdown */ 770 void snd_usb_unlock_shutdown(struct snd_usb_audio *chip) 771 { 772 snd_usb_autosuspend(chip); 773 if (atomic_dec_and_test(&chip->usage_count)) 774 wake_up(&chip->shutdown_wait); 775 } 776 777 #ifdef CONFIG_PM 778 779 int snd_usb_autoresume(struct snd_usb_audio *chip) 780 { 781 if (atomic_read(&chip->shutdown)) 782 return -EIO; 783 if (atomic_inc_return(&chip->active) == 1) 784 return usb_autopm_get_interface(chip->pm_intf); 785 return 0; 786 } 787 788 void snd_usb_autosuspend(struct snd_usb_audio *chip) 789 { 790 if (atomic_read(&chip->shutdown)) 791 return; 792 if (atomic_dec_and_test(&chip->active)) 793 usb_autopm_put_interface(chip->pm_intf); 794 } 795 796 static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message) 797 { 798 struct snd_usb_audio *chip = usb_get_intfdata(intf); 799 struct snd_usb_stream *as; 800 struct usb_mixer_interface *mixer; 801 struct list_head *p; 802 803 if (chip == (void *)-1L) 804 return 0; 805 806 chip->autosuspended = !!PMSG_IS_AUTO(message); 807 if (!chip->autosuspended) 808 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot); 809 if (!chip->num_suspended_intf++) { 810 list_for_each_entry(as, &chip->pcm_list, list) { 811 snd_pcm_suspend_all(as->pcm); 812 as->substream[0].need_setup_ep = 813 as->substream[1].need_setup_ep = true; 814 } 815 list_for_each(p, &chip->midi_list) 816 snd_usbmidi_suspend(p); 817 list_for_each_entry(mixer, &chip->mixer_list, list) 818 snd_usb_mixer_suspend(mixer); 819 } 820 821 return 0; 822 } 823 824 static int __usb_audio_resume(struct usb_interface *intf, bool reset_resume) 825 { 826 struct snd_usb_audio *chip = usb_get_intfdata(intf); 827 struct usb_mixer_interface *mixer; 828 struct list_head *p; 829 int err = 0; 830 831 if (chip == (void *)-1L) 832 return 0; 833 if (--chip->num_suspended_intf) 834 return 0; 835 836 atomic_inc(&chip->active); /* avoid autopm */ 837 /* 838 * ALSA leaves material resumption to user space 839 * we just notify and restart the mixers 840 */ 841 list_for_each_entry(mixer, &chip->mixer_list, list) { 842 err = snd_usb_mixer_resume(mixer, reset_resume); 843 if (err < 0) 844 goto err_out; 845 } 846 847 list_for_each(p, &chip->midi_list) { 848 snd_usbmidi_resume(p); 849 } 850 851 if (!chip->autosuspended) 852 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0); 853 chip->autosuspended = 0; 854 855 err_out: 856 atomic_dec(&chip->active); /* allow autopm after this point */ 857 return err; 858 } 859 860 static int usb_audio_resume(struct usb_interface *intf) 861 { 862 return __usb_audio_resume(intf, false); 863 } 864 865 static int usb_audio_reset_resume(struct usb_interface *intf) 866 { 867 return __usb_audio_resume(intf, true); 868 } 869 #else 870 #define usb_audio_suspend NULL 871 #define usb_audio_resume NULL 872 #define usb_audio_reset_resume NULL 873 #endif /* CONFIG_PM */ 874 875 static const struct usb_device_id usb_audio_ids [] = { 876 #include "quirks-table.h" 877 { .match_flags = (USB_DEVICE_ID_MATCH_INT_CLASS | USB_DEVICE_ID_MATCH_INT_SUBCLASS), 878 .bInterfaceClass = USB_CLASS_AUDIO, 879 .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL }, 880 { } /* Terminating entry */ 881 }; 882 MODULE_DEVICE_TABLE(usb, usb_audio_ids); 883 884 /* 885 * entry point for linux usb interface 886 */ 887 888 static struct usb_driver usb_audio_driver = { 889 .name = "snd-usb-audio", 890 .probe = usb_audio_probe, 891 .disconnect = usb_audio_disconnect, 892 .suspend = usb_audio_suspend, 893 .resume = usb_audio_resume, 894 .reset_resume = usb_audio_reset_resume, 895 .id_table = usb_audio_ids, 896 .supports_autosuspend = 1, 897 }; 898 899 module_usb_driver(usb_audio_driver); 900