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 static char *quirk_alias[SNDRV_CARDS]; 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_array(device_setup, int, NULL, 0444); 98 MODULE_PARM_DESC(device_setup, "Specific device setup (if needed)."); 99 module_param(ignore_ctl_error, bool, 0444); 100 MODULE_PARM_DESC(ignore_ctl_error, 101 "Ignore errors from USB controller for mixer interfaces."); 102 module_param(autoclock, bool, 0444); 103 MODULE_PARM_DESC(autoclock, "Enable auto-clock selection for UAC2 devices (default: yes)."); 104 module_param_array(quirk_alias, charp, NULL, 0444); 105 MODULE_PARM_DESC(quirk_alias, "Quirk aliases, e.g. 0123abcd:5678beef."); 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 usb_audio_disconnect() 119 */ 120 static void snd_usb_stream_disconnect(struct snd_usb_stream *as) 121 { 122 int idx; 123 struct snd_usb_substream *subs; 124 125 for (idx = 0; idx < 2; idx++) { 126 subs = &as->substream[idx]; 127 if (!subs->num_formats) 128 continue; 129 subs->interface = -1; 130 subs->data_endpoint = NULL; 131 subs->sync_endpoint = NULL; 132 } 133 } 134 135 static int snd_usb_create_stream(struct snd_usb_audio *chip, int ctrlif, int interface) 136 { 137 struct usb_device *dev = chip->dev; 138 struct usb_host_interface *alts; 139 struct usb_interface_descriptor *altsd; 140 struct usb_interface *iface = usb_ifnum_to_if(dev, interface); 141 142 if (!iface) { 143 dev_err(&dev->dev, "%u:%d : does not exist\n", 144 ctrlif, interface); 145 return -EINVAL; 146 } 147 148 alts = &iface->altsetting[0]; 149 altsd = get_iface_desc(alts); 150 151 /* 152 * Android with both accessory and audio interfaces enabled gets the 153 * interface numbers wrong. 154 */ 155 if ((chip->usb_id == USB_ID(0x18d1, 0x2d04) || 156 chip->usb_id == USB_ID(0x18d1, 0x2d05)) && 157 interface == 0 && 158 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC && 159 altsd->bInterfaceSubClass == USB_SUBCLASS_VENDOR_SPEC) { 160 interface = 2; 161 iface = usb_ifnum_to_if(dev, interface); 162 if (!iface) 163 return -EINVAL; 164 alts = &iface->altsetting[0]; 165 altsd = get_iface_desc(alts); 166 } 167 168 if (usb_interface_claimed(iface)) { 169 dev_dbg(&dev->dev, "%d:%d: skipping, already claimed\n", 170 ctrlif, interface); 171 return -EINVAL; 172 } 173 174 if ((altsd->bInterfaceClass == USB_CLASS_AUDIO || 175 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC) && 176 altsd->bInterfaceSubClass == USB_SUBCLASS_MIDISTREAMING) { 177 int err = __snd_usbmidi_create(chip->card, iface, 178 &chip->midi_list, NULL, 179 chip->usb_id); 180 if (err < 0) { 181 dev_err(&dev->dev, 182 "%u:%d: cannot create sequencer device\n", 183 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 dev_dbg(&dev->dev, 195 "%u:%d: skipping non-supported interface %d\n", 196 ctrlif, interface, altsd->bInterfaceClass); 197 /* skip non-supported classes */ 198 return -EINVAL; 199 } 200 201 if (snd_usb_get_speed(dev) == USB_SPEED_LOW) { 202 dev_err(&dev->dev, "low speed audio streaming not supported\n"); 203 return -EINVAL; 204 } 205 206 if (! snd_usb_parse_audio_interface(chip, interface)) { 207 usb_set_interface(dev, interface, 0); /* reset the current interface */ 208 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L); 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 int rest_bytes; 225 226 /* find audiocontrol interface */ 227 host_iface = &usb_ifnum_to_if(dev, ctrlif)->altsetting[0]; 228 control_header = snd_usb_find_csint_desc(host_iface->extra, 229 host_iface->extralen, 230 NULL, UAC_HEADER); 231 altsd = get_iface_desc(host_iface); 232 protocol = altsd->bInterfaceProtocol; 233 234 if (!control_header) { 235 dev_err(&dev->dev, "cannot find UAC_HEADER\n"); 236 return -EINVAL; 237 } 238 239 rest_bytes = (void *)(host_iface->extra + host_iface->extralen) - 240 control_header; 241 242 /* just to be sure -- this shouldn't hit at all */ 243 if (rest_bytes <= 0) { 244 dev_err(&dev->dev, "invalid control header\n"); 245 return -EINVAL; 246 } 247 248 switch (protocol) { 249 default: 250 dev_warn(&dev->dev, 251 "unknown interface protocol %#02x, assuming v1\n", 252 protocol); 253 /* fall through */ 254 255 case UAC_VERSION_1: { 256 struct uac1_ac_header_descriptor *h1 = control_header; 257 258 if (rest_bytes < sizeof(*h1)) { 259 dev_err(&dev->dev, "too short v1 buffer descriptor\n"); 260 return -EINVAL; 261 } 262 263 if (!h1->bInCollection) { 264 dev_info(&dev->dev, "skipping empty audio interface (v1)\n"); 265 return -EINVAL; 266 } 267 268 if (rest_bytes < h1->bLength) { 269 dev_err(&dev->dev, "invalid buffer length (v1)\n"); 270 return -EINVAL; 271 } 272 273 if (h1->bLength < sizeof(*h1) + h1->bInCollection) { 274 dev_err(&dev->dev, "invalid UAC_HEADER (v1)\n"); 275 return -EINVAL; 276 } 277 278 for (i = 0; i < h1->bInCollection; i++) 279 snd_usb_create_stream(chip, ctrlif, h1->baInterfaceNr[i]); 280 281 break; 282 } 283 284 case UAC_VERSION_2: { 285 struct usb_interface_assoc_descriptor *assoc = 286 usb_ifnum_to_if(dev, ctrlif)->intf_assoc; 287 288 if (!assoc) { 289 /* 290 * Firmware writers cannot count to three. So to find 291 * the IAD on the NuForce UDH-100, also check the next 292 * interface. 293 */ 294 struct usb_interface *iface = 295 usb_ifnum_to_if(dev, ctrlif + 1); 296 if (iface && 297 iface->intf_assoc && 298 iface->intf_assoc->bFunctionClass == USB_CLASS_AUDIO && 299 iface->intf_assoc->bFunctionProtocol == UAC_VERSION_2) 300 assoc = iface->intf_assoc; 301 } 302 303 if (!assoc) { 304 dev_err(&dev->dev, "Audio class v2 interfaces need an interface association\n"); 305 return -EINVAL; 306 } 307 308 for (i = 0; i < assoc->bInterfaceCount; i++) { 309 int intf = assoc->bFirstInterface + i; 310 311 if (intf != ctrlif) 312 snd_usb_create_stream(chip, ctrlif, intf); 313 } 314 315 break; 316 } 317 } 318 319 return 0; 320 } 321 322 /* 323 * free the chip instance 324 * 325 * here we have to do not much, since pcm and controls are already freed 326 * 327 */ 328 329 static int snd_usb_audio_free(struct snd_usb_audio *chip) 330 { 331 struct snd_usb_endpoint *ep, *n; 332 333 list_for_each_entry_safe(ep, n, &chip->ep_list, list) 334 snd_usb_endpoint_free(ep); 335 336 mutex_destroy(&chip->mutex); 337 if (!atomic_read(&chip->shutdown)) 338 dev_set_drvdata(&chip->dev->dev, NULL); 339 kfree(chip); 340 return 0; 341 } 342 343 static int snd_usb_audio_dev_free(struct snd_device *device) 344 { 345 struct snd_usb_audio *chip = device->device_data; 346 return snd_usb_audio_free(chip); 347 } 348 349 /* 350 * create a chip instance and set its names. 351 */ 352 static int snd_usb_audio_create(struct usb_interface *intf, 353 struct usb_device *dev, int idx, 354 const struct snd_usb_audio_quirk *quirk, 355 unsigned int usb_id, 356 struct snd_usb_audio **rchip) 357 { 358 struct snd_card *card; 359 struct snd_usb_audio *chip; 360 int err, len; 361 char component[14]; 362 static struct snd_device_ops ops = { 363 .dev_free = snd_usb_audio_dev_free, 364 }; 365 366 *rchip = NULL; 367 368 switch (snd_usb_get_speed(dev)) { 369 case USB_SPEED_LOW: 370 case USB_SPEED_FULL: 371 case USB_SPEED_HIGH: 372 case USB_SPEED_WIRELESS: 373 case USB_SPEED_SUPER: 374 case USB_SPEED_SUPER_PLUS: 375 break; 376 default: 377 dev_err(&dev->dev, "unknown device speed %d\n", snd_usb_get_speed(dev)); 378 return -ENXIO; 379 } 380 381 err = snd_card_new(&intf->dev, index[idx], id[idx], THIS_MODULE, 382 0, &card); 383 if (err < 0) { 384 dev_err(&dev->dev, "cannot create card instance %d\n", idx); 385 return err; 386 } 387 388 chip = kzalloc(sizeof(*chip), GFP_KERNEL); 389 if (! chip) { 390 snd_card_free(card); 391 return -ENOMEM; 392 } 393 394 mutex_init(&chip->mutex); 395 init_waitqueue_head(&chip->shutdown_wait); 396 chip->index = idx; 397 chip->dev = dev; 398 chip->card = card; 399 chip->setup = device_setup[idx]; 400 chip->autoclock = autoclock; 401 atomic_set(&chip->active, 1); /* avoid autopm during probing */ 402 atomic_set(&chip->usage_count, 0); 403 atomic_set(&chip->shutdown, 0); 404 405 chip->usb_id = usb_id; 406 INIT_LIST_HEAD(&chip->pcm_list); 407 INIT_LIST_HEAD(&chip->ep_list); 408 INIT_LIST_HEAD(&chip->midi_list); 409 INIT_LIST_HEAD(&chip->mixer_list); 410 411 if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) { 412 snd_usb_audio_free(chip); 413 snd_card_free(card); 414 return err; 415 } 416 417 strcpy(card->driver, "USB-Audio"); 418 sprintf(component, "USB%04x:%04x", 419 USB_ID_VENDOR(chip->usb_id), USB_ID_PRODUCT(chip->usb_id)); 420 snd_component_add(card, component); 421 422 /* retrieve the device string as shortname */ 423 if (quirk && quirk->product_name && *quirk->product_name) { 424 strlcpy(card->shortname, quirk->product_name, sizeof(card->shortname)); 425 } else { 426 if (!dev->descriptor.iProduct || 427 usb_string(dev, dev->descriptor.iProduct, 428 card->shortname, sizeof(card->shortname)) <= 0) { 429 /* no name available from anywhere, so use ID */ 430 sprintf(card->shortname, "USB Device %#04x:%#04x", 431 USB_ID_VENDOR(chip->usb_id), 432 USB_ID_PRODUCT(chip->usb_id)); 433 } 434 } 435 strim(card->shortname); 436 437 /* retrieve the vendor and device strings as longname */ 438 if (quirk && quirk->vendor_name && *quirk->vendor_name) { 439 len = strlcpy(card->longname, quirk->vendor_name, sizeof(card->longname)); 440 } else { 441 if (dev->descriptor.iManufacturer) 442 len = usb_string(dev, dev->descriptor.iManufacturer, 443 card->longname, sizeof(card->longname)); 444 else 445 len = 0; 446 /* we don't really care if there isn't any vendor string */ 447 } 448 if (len > 0) { 449 strim(card->longname); 450 if (*card->longname) 451 strlcat(card->longname, " ", sizeof(card->longname)); 452 } 453 454 strlcat(card->longname, card->shortname, sizeof(card->longname)); 455 456 len = strlcat(card->longname, " at ", sizeof(card->longname)); 457 458 if (len < sizeof(card->longname)) 459 usb_make_path(dev, card->longname + len, sizeof(card->longname) - len); 460 461 switch (snd_usb_get_speed(dev)) { 462 case USB_SPEED_LOW: 463 strlcat(card->longname, ", low speed", sizeof(card->longname)); 464 break; 465 case USB_SPEED_FULL: 466 strlcat(card->longname, ", full speed", sizeof(card->longname)); 467 break; 468 case USB_SPEED_HIGH: 469 strlcat(card->longname, ", high speed", sizeof(card->longname)); 470 break; 471 case USB_SPEED_SUPER: 472 strlcat(card->longname, ", super speed", sizeof(card->longname)); 473 break; 474 case USB_SPEED_SUPER_PLUS: 475 strlcat(card->longname, ", super speed plus", sizeof(card->longname)); 476 break; 477 default: 478 break; 479 } 480 481 snd_usb_audio_create_proc(chip); 482 483 *rchip = chip; 484 return 0; 485 } 486 487 /* look for a matching quirk alias id */ 488 static bool get_alias_id(struct usb_device *dev, unsigned int *id) 489 { 490 int i; 491 unsigned int src, dst; 492 493 for (i = 0; i < ARRAY_SIZE(quirk_alias); i++) { 494 if (!quirk_alias[i] || 495 sscanf(quirk_alias[i], "%x:%x", &src, &dst) != 2 || 496 src != *id) 497 continue; 498 dev_info(&dev->dev, 499 "device (%04x:%04x): applying quirk alias %04x:%04x\n", 500 USB_ID_VENDOR(*id), USB_ID_PRODUCT(*id), 501 USB_ID_VENDOR(dst), USB_ID_PRODUCT(dst)); 502 *id = dst; 503 return true; 504 } 505 506 return false; 507 } 508 509 static const struct usb_device_id usb_audio_ids[]; /* defined below */ 510 511 /* look for the corresponding quirk */ 512 static const struct snd_usb_audio_quirk * 513 get_alias_quirk(struct usb_device *dev, unsigned int id) 514 { 515 const struct usb_device_id *p; 516 517 for (p = usb_audio_ids; p->match_flags; p++) { 518 /* FIXME: this checks only vendor:product pair in the list */ 519 if ((p->match_flags & USB_DEVICE_ID_MATCH_DEVICE) == 520 USB_DEVICE_ID_MATCH_DEVICE && 521 p->idVendor == USB_ID_VENDOR(id) && 522 p->idProduct == USB_ID_PRODUCT(id)) 523 return (const struct snd_usb_audio_quirk *)p->driver_info; 524 } 525 526 return NULL; 527 } 528 529 /* 530 * probe the active usb device 531 * 532 * note that this can be called multiple times per a device, when it 533 * includes multiple audio control interfaces. 534 * 535 * thus we check the usb device pointer and creates the card instance 536 * only at the first time. the successive calls of this function will 537 * append the pcm interface to the corresponding card. 538 */ 539 static int usb_audio_probe(struct usb_interface *intf, 540 const struct usb_device_id *usb_id) 541 { 542 struct usb_device *dev = interface_to_usbdev(intf); 543 const struct snd_usb_audio_quirk *quirk = 544 (const struct snd_usb_audio_quirk *)usb_id->driver_info; 545 struct snd_usb_audio *chip; 546 int i, err; 547 struct usb_host_interface *alts; 548 int ifnum; 549 u32 id; 550 551 alts = &intf->altsetting[0]; 552 ifnum = get_iface_desc(alts)->bInterfaceNumber; 553 id = USB_ID(le16_to_cpu(dev->descriptor.idVendor), 554 le16_to_cpu(dev->descriptor.idProduct)); 555 if (get_alias_id(dev, &id)) 556 quirk = get_alias_quirk(dev, id); 557 if (quirk && quirk->ifnum >= 0 && ifnum != quirk->ifnum) 558 return -ENXIO; 559 560 err = snd_usb_apply_boot_quirk(dev, intf, quirk, id); 561 if (err < 0) 562 return err; 563 564 /* 565 * found a config. now register to ALSA 566 */ 567 568 /* check whether it's already registered */ 569 chip = NULL; 570 mutex_lock(®ister_mutex); 571 for (i = 0; i < SNDRV_CARDS; i++) { 572 if (usb_chip[i] && usb_chip[i]->dev == dev) { 573 if (atomic_read(&usb_chip[i]->shutdown)) { 574 dev_err(&dev->dev, "USB device is in the shutdown state, cannot create a card instance\n"); 575 err = -EIO; 576 goto __error; 577 } 578 chip = usb_chip[i]; 579 atomic_inc(&chip->active); /* avoid autopm */ 580 break; 581 } 582 } 583 if (! chip) { 584 /* it's a fresh one. 585 * now look for an empty slot and create a new card instance 586 */ 587 for (i = 0; i < SNDRV_CARDS; i++) 588 if (enable[i] && ! usb_chip[i] && 589 (vid[i] == -1 || vid[i] == USB_ID_VENDOR(id)) && 590 (pid[i] == -1 || pid[i] == USB_ID_PRODUCT(id))) { 591 err = snd_usb_audio_create(intf, dev, i, quirk, 592 id, &chip); 593 if (err < 0) 594 goto __error; 595 chip->pm_intf = intf; 596 break; 597 } 598 if (!chip) { 599 dev_err(&dev->dev, "no available usb audio device\n"); 600 err = -ENODEV; 601 goto __error; 602 } 603 } 604 dev_set_drvdata(&dev->dev, chip); 605 606 /* 607 * For devices with more than one control interface, we assume the 608 * first contains the audio controls. We might need a more specific 609 * check here in the future. 610 */ 611 if (!chip->ctrl_intf) 612 chip->ctrl_intf = alts; 613 614 chip->txfr_quirk = 0; 615 err = 1; /* continue */ 616 if (quirk && quirk->ifnum != QUIRK_NO_INTERFACE) { 617 /* need some special handlings */ 618 err = snd_usb_create_quirk(chip, intf, &usb_audio_driver, quirk); 619 if (err < 0) 620 goto __error; 621 } 622 623 if (err > 0) { 624 /* create normal USB audio interfaces */ 625 err = snd_usb_create_streams(chip, ifnum); 626 if (err < 0) 627 goto __error; 628 err = snd_usb_create_mixer(chip, ifnum, ignore_ctl_error); 629 if (err < 0) 630 goto __error; 631 } 632 633 /* we are allowed to call snd_card_register() many times */ 634 err = snd_card_register(chip->card); 635 if (err < 0) 636 goto __error; 637 638 usb_chip[chip->index] = chip; 639 chip->num_interfaces++; 640 usb_set_intfdata(intf, chip); 641 atomic_dec(&chip->active); 642 mutex_unlock(®ister_mutex); 643 return 0; 644 645 __error: 646 if (chip) { 647 if (!chip->num_interfaces) 648 snd_card_free(chip->card); 649 atomic_dec(&chip->active); 650 } 651 mutex_unlock(®ister_mutex); 652 return err; 653 } 654 655 /* 656 * we need to take care of counter, since disconnection can be called also 657 * many times as well as usb_audio_probe(). 658 */ 659 static void usb_audio_disconnect(struct usb_interface *intf) 660 { 661 struct snd_usb_audio *chip = usb_get_intfdata(intf); 662 struct snd_card *card; 663 struct list_head *p; 664 665 if (chip == (void *)-1L) 666 return; 667 668 card = chip->card; 669 670 mutex_lock(®ister_mutex); 671 if (atomic_inc_return(&chip->shutdown) == 1) { 672 struct snd_usb_stream *as; 673 struct snd_usb_endpoint *ep; 674 struct usb_mixer_interface *mixer; 675 676 /* wait until all pending tasks done; 677 * they are protected by snd_usb_lock_shutdown() 678 */ 679 wait_event(chip->shutdown_wait, 680 !atomic_read(&chip->usage_count)); 681 snd_card_disconnect(card); 682 /* release the pcm resources */ 683 list_for_each_entry(as, &chip->pcm_list, list) { 684 snd_usb_stream_disconnect(as); 685 } 686 /* release the endpoint resources */ 687 list_for_each_entry(ep, &chip->ep_list, list) { 688 snd_usb_endpoint_release(ep); 689 } 690 /* release the midi resources */ 691 list_for_each(p, &chip->midi_list) { 692 snd_usbmidi_disconnect(p); 693 } 694 /* release mixer resources */ 695 list_for_each_entry(mixer, &chip->mixer_list, list) { 696 snd_usb_mixer_disconnect(mixer); 697 } 698 } 699 700 chip->num_interfaces--; 701 if (chip->num_interfaces <= 0) { 702 usb_chip[chip->index] = NULL; 703 mutex_unlock(®ister_mutex); 704 snd_card_free_when_closed(card); 705 } else { 706 mutex_unlock(®ister_mutex); 707 } 708 } 709 710 /* lock the shutdown (disconnect) task and autoresume */ 711 int snd_usb_lock_shutdown(struct snd_usb_audio *chip) 712 { 713 int err; 714 715 atomic_inc(&chip->usage_count); 716 if (atomic_read(&chip->shutdown)) { 717 err = -EIO; 718 goto error; 719 } 720 err = snd_usb_autoresume(chip); 721 if (err < 0) 722 goto error; 723 return 0; 724 725 error: 726 if (atomic_dec_and_test(&chip->usage_count)) 727 wake_up(&chip->shutdown_wait); 728 return err; 729 } 730 731 /* autosuspend and unlock the shutdown */ 732 void snd_usb_unlock_shutdown(struct snd_usb_audio *chip) 733 { 734 snd_usb_autosuspend(chip); 735 if (atomic_dec_and_test(&chip->usage_count)) 736 wake_up(&chip->shutdown_wait); 737 } 738 739 #ifdef CONFIG_PM 740 741 int snd_usb_autoresume(struct snd_usb_audio *chip) 742 { 743 if (atomic_read(&chip->shutdown)) 744 return -EIO; 745 if (atomic_inc_return(&chip->active) == 1) 746 return usb_autopm_get_interface(chip->pm_intf); 747 return 0; 748 } 749 750 void snd_usb_autosuspend(struct snd_usb_audio *chip) 751 { 752 if (atomic_read(&chip->shutdown)) 753 return; 754 if (atomic_dec_and_test(&chip->active)) 755 usb_autopm_put_interface(chip->pm_intf); 756 } 757 758 static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message) 759 { 760 struct snd_usb_audio *chip = usb_get_intfdata(intf); 761 struct snd_usb_stream *as; 762 struct usb_mixer_interface *mixer; 763 struct list_head *p; 764 765 if (chip == (void *)-1L) 766 return 0; 767 768 chip->autosuspended = !!PMSG_IS_AUTO(message); 769 if (!chip->autosuspended) 770 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot); 771 if (!chip->num_suspended_intf++) { 772 list_for_each_entry(as, &chip->pcm_list, list) { 773 snd_pcm_suspend_all(as->pcm); 774 as->substream[0].need_setup_ep = 775 as->substream[1].need_setup_ep = true; 776 } 777 list_for_each(p, &chip->midi_list) 778 snd_usbmidi_suspend(p); 779 list_for_each_entry(mixer, &chip->mixer_list, list) 780 snd_usb_mixer_suspend(mixer); 781 } 782 783 return 0; 784 } 785 786 static int __usb_audio_resume(struct usb_interface *intf, bool reset_resume) 787 { 788 struct snd_usb_audio *chip = usb_get_intfdata(intf); 789 struct usb_mixer_interface *mixer; 790 struct list_head *p; 791 int err = 0; 792 793 if (chip == (void *)-1L) 794 return 0; 795 if (--chip->num_suspended_intf) 796 return 0; 797 798 atomic_inc(&chip->active); /* avoid autopm */ 799 /* 800 * ALSA leaves material resumption to user space 801 * we just notify and restart the mixers 802 */ 803 list_for_each_entry(mixer, &chip->mixer_list, list) { 804 err = snd_usb_mixer_resume(mixer, reset_resume); 805 if (err < 0) 806 goto err_out; 807 } 808 809 list_for_each(p, &chip->midi_list) { 810 snd_usbmidi_resume(p); 811 } 812 813 if (!chip->autosuspended) 814 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0); 815 chip->autosuspended = 0; 816 817 err_out: 818 atomic_dec(&chip->active); /* allow autopm after this point */ 819 return err; 820 } 821 822 static int usb_audio_resume(struct usb_interface *intf) 823 { 824 return __usb_audio_resume(intf, false); 825 } 826 827 static int usb_audio_reset_resume(struct usb_interface *intf) 828 { 829 return __usb_audio_resume(intf, true); 830 } 831 #else 832 #define usb_audio_suspend NULL 833 #define usb_audio_resume NULL 834 #define usb_audio_reset_resume NULL 835 #endif /* CONFIG_PM */ 836 837 static const struct usb_device_id usb_audio_ids [] = { 838 #include "quirks-table.h" 839 { .match_flags = (USB_DEVICE_ID_MATCH_INT_CLASS | USB_DEVICE_ID_MATCH_INT_SUBCLASS), 840 .bInterfaceClass = USB_CLASS_AUDIO, 841 .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL }, 842 { } /* Terminating entry */ 843 }; 844 MODULE_DEVICE_TABLE(usb, usb_audio_ids); 845 846 /* 847 * entry point for linux usb interface 848 */ 849 850 static struct usb_driver usb_audio_driver = { 851 .name = "snd-usb-audio", 852 .probe = usb_audio_probe, 853 .disconnect = usb_audio_disconnect, 854 .suspend = usb_audio_suspend, 855 .resume = usb_audio_resume, 856 .reset_resume = usb_audio_reset_resume, 857 .id_table = usb_audio_ids, 858 .supports_autosuspend = 1, 859 }; 860 861 module_usb_driver(usb_audio_driver); 862