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; 224 225 /* 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 dev_err(&dev->dev, "cannot find UAC_HEADER\n"); 235 return -EINVAL; 236 } 237 238 switch (protocol) { 239 default: 240 dev_warn(&dev->dev, 241 "unknown interface protocol %#02x, assuming v1\n", 242 protocol); 243 /* fall through */ 244 245 case UAC_VERSION_1: { 246 struct uac1_ac_header_descriptor *h1 = control_header; 247 248 if (!h1->bInCollection) { 249 dev_info(&dev->dev, "skipping empty audio interface (v1)\n"); 250 return -EINVAL; 251 } 252 253 if (h1->bLength < sizeof(*h1) + h1->bInCollection) { 254 dev_err(&dev->dev, "invalid UAC_HEADER (v1)\n"); 255 return -EINVAL; 256 } 257 258 for (i = 0; i < h1->bInCollection; i++) 259 snd_usb_create_stream(chip, ctrlif, h1->baInterfaceNr[i]); 260 261 break; 262 } 263 264 case UAC_VERSION_2: { 265 struct usb_interface_assoc_descriptor *assoc = 266 usb_ifnum_to_if(dev, ctrlif)->intf_assoc; 267 268 if (!assoc) { 269 /* 270 * Firmware writers cannot count to three. So to find 271 * the IAD on the NuForce UDH-100, also check the next 272 * interface. 273 */ 274 struct usb_interface *iface = 275 usb_ifnum_to_if(dev, ctrlif + 1); 276 if (iface && 277 iface->intf_assoc && 278 iface->intf_assoc->bFunctionClass == USB_CLASS_AUDIO && 279 iface->intf_assoc->bFunctionProtocol == UAC_VERSION_2) 280 assoc = iface->intf_assoc; 281 } 282 283 if (!assoc) { 284 dev_err(&dev->dev, "Audio class v2 interfaces need an interface association\n"); 285 return -EINVAL; 286 } 287 288 for (i = 0; i < assoc->bInterfaceCount; i++) { 289 int intf = assoc->bFirstInterface + i; 290 291 if (intf != ctrlif) 292 snd_usb_create_stream(chip, ctrlif, intf); 293 } 294 295 break; 296 } 297 } 298 299 return 0; 300 } 301 302 /* 303 * free the chip instance 304 * 305 * here we have to do not much, since pcm and controls are already freed 306 * 307 */ 308 309 static int snd_usb_audio_free(struct snd_usb_audio *chip) 310 { 311 struct snd_usb_endpoint *ep, *n; 312 313 list_for_each_entry_safe(ep, n, &chip->ep_list, list) 314 snd_usb_endpoint_free(ep); 315 316 mutex_destroy(&chip->mutex); 317 if (!atomic_read(&chip->shutdown)) 318 dev_set_drvdata(&chip->dev->dev, NULL); 319 kfree(chip); 320 return 0; 321 } 322 323 static int snd_usb_audio_dev_free(struct snd_device *device) 324 { 325 struct snd_usb_audio *chip = device->device_data; 326 return snd_usb_audio_free(chip); 327 } 328 329 /* 330 * create a chip instance and set its names. 331 */ 332 static int snd_usb_audio_create(struct usb_interface *intf, 333 struct usb_device *dev, int idx, 334 const struct snd_usb_audio_quirk *quirk, 335 unsigned int usb_id, 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_WIRELESS: 353 case USB_SPEED_SUPER: 354 case USB_SPEED_SUPER_PLUS: 355 break; 356 default: 357 dev_err(&dev->dev, "unknown device speed %d\n", snd_usb_get_speed(dev)); 358 return -ENXIO; 359 } 360 361 err = snd_card_new(&intf->dev, index[idx], id[idx], THIS_MODULE, 362 0, &card); 363 if (err < 0) { 364 dev_err(&dev->dev, "cannot create card instance %d\n", idx); 365 return err; 366 } 367 368 chip = kzalloc(sizeof(*chip), GFP_KERNEL); 369 if (! chip) { 370 snd_card_free(card); 371 return -ENOMEM; 372 } 373 374 mutex_init(&chip->mutex); 375 init_waitqueue_head(&chip->shutdown_wait); 376 chip->index = idx; 377 chip->dev = dev; 378 chip->card = card; 379 chip->setup = device_setup[idx]; 380 chip->autoclock = autoclock; 381 atomic_set(&chip->active, 1); /* avoid autopm during probing */ 382 atomic_set(&chip->usage_count, 0); 383 atomic_set(&chip->shutdown, 0); 384 385 chip->usb_id = usb_id; 386 INIT_LIST_HEAD(&chip->pcm_list); 387 INIT_LIST_HEAD(&chip->ep_list); 388 INIT_LIST_HEAD(&chip->midi_list); 389 INIT_LIST_HEAD(&chip->mixer_list); 390 391 if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) { 392 snd_usb_audio_free(chip); 393 snd_card_free(card); 394 return err; 395 } 396 397 strcpy(card->driver, "USB-Audio"); 398 sprintf(component, "USB%04x:%04x", 399 USB_ID_VENDOR(chip->usb_id), USB_ID_PRODUCT(chip->usb_id)); 400 snd_component_add(card, component); 401 402 /* retrieve the device string as shortname */ 403 if (quirk && quirk->product_name && *quirk->product_name) { 404 strlcpy(card->shortname, quirk->product_name, sizeof(card->shortname)); 405 } else { 406 if (!dev->descriptor.iProduct || 407 usb_string(dev, dev->descriptor.iProduct, 408 card->shortname, sizeof(card->shortname)) <= 0) { 409 /* no name available from anywhere, so use ID */ 410 sprintf(card->shortname, "USB Device %#04x:%#04x", 411 USB_ID_VENDOR(chip->usb_id), 412 USB_ID_PRODUCT(chip->usb_id)); 413 } 414 } 415 strim(card->shortname); 416 417 /* retrieve the vendor and device strings as longname */ 418 if (quirk && quirk->vendor_name && *quirk->vendor_name) { 419 len = strlcpy(card->longname, quirk->vendor_name, sizeof(card->longname)); 420 } else { 421 if (dev->descriptor.iManufacturer) 422 len = usb_string(dev, dev->descriptor.iManufacturer, 423 card->longname, sizeof(card->longname)); 424 else 425 len = 0; 426 /* we don't really care if there isn't any vendor string */ 427 } 428 if (len > 0) { 429 strim(card->longname); 430 if (*card->longname) 431 strlcat(card->longname, " ", sizeof(card->longname)); 432 } 433 434 strlcat(card->longname, card->shortname, sizeof(card->longname)); 435 436 len = strlcat(card->longname, " at ", sizeof(card->longname)); 437 438 if (len < sizeof(card->longname)) 439 usb_make_path(dev, card->longname + len, sizeof(card->longname) - len); 440 441 switch (snd_usb_get_speed(dev)) { 442 case USB_SPEED_LOW: 443 strlcat(card->longname, ", low speed", sizeof(card->longname)); 444 break; 445 case USB_SPEED_FULL: 446 strlcat(card->longname, ", full speed", sizeof(card->longname)); 447 break; 448 case USB_SPEED_HIGH: 449 strlcat(card->longname, ", high speed", sizeof(card->longname)); 450 break; 451 case USB_SPEED_SUPER: 452 strlcat(card->longname, ", super speed", sizeof(card->longname)); 453 break; 454 case USB_SPEED_SUPER_PLUS: 455 strlcat(card->longname, ", super speed plus", sizeof(card->longname)); 456 break; 457 default: 458 break; 459 } 460 461 snd_usb_audio_create_proc(chip); 462 463 *rchip = chip; 464 return 0; 465 } 466 467 /* look for a matching quirk alias id */ 468 static bool get_alias_id(struct usb_device *dev, unsigned int *id) 469 { 470 int i; 471 unsigned int src, dst; 472 473 for (i = 0; i < ARRAY_SIZE(quirk_alias); i++) { 474 if (!quirk_alias[i] || 475 sscanf(quirk_alias[i], "%x:%x", &src, &dst) != 2 || 476 src != *id) 477 continue; 478 dev_info(&dev->dev, 479 "device (%04x:%04x): applying quirk alias %04x:%04x\n", 480 USB_ID_VENDOR(*id), USB_ID_PRODUCT(*id), 481 USB_ID_VENDOR(dst), USB_ID_PRODUCT(dst)); 482 *id = dst; 483 return true; 484 } 485 486 return false; 487 } 488 489 static struct usb_device_id usb_audio_ids[]; /* defined below */ 490 491 /* look for the corresponding quirk */ 492 static const struct snd_usb_audio_quirk * 493 get_alias_quirk(struct usb_device *dev, unsigned int id) 494 { 495 const struct usb_device_id *p; 496 497 for (p = usb_audio_ids; p->match_flags; p++) { 498 /* FIXME: this checks only vendor:product pair in the list */ 499 if ((p->match_flags & USB_DEVICE_ID_MATCH_DEVICE) == 500 USB_DEVICE_ID_MATCH_DEVICE && 501 p->idVendor == USB_ID_VENDOR(id) && 502 p->idProduct == USB_ID_PRODUCT(id)) 503 return (const struct snd_usb_audio_quirk *)p->driver_info; 504 } 505 506 return NULL; 507 } 508 509 /* 510 * probe the active usb device 511 * 512 * note that this can be called multiple times per a device, when it 513 * includes multiple audio control interfaces. 514 * 515 * thus we check the usb device pointer and creates the card instance 516 * only at the first time. the successive calls of this function will 517 * append the pcm interface to the corresponding card. 518 */ 519 static int usb_audio_probe(struct usb_interface *intf, 520 const struct usb_device_id *usb_id) 521 { 522 struct usb_device *dev = interface_to_usbdev(intf); 523 const struct snd_usb_audio_quirk *quirk = 524 (const struct snd_usb_audio_quirk *)usb_id->driver_info; 525 struct snd_usb_audio *chip; 526 int i, err; 527 struct usb_host_interface *alts; 528 int ifnum; 529 u32 id; 530 531 alts = &intf->altsetting[0]; 532 ifnum = get_iface_desc(alts)->bInterfaceNumber; 533 id = USB_ID(le16_to_cpu(dev->descriptor.idVendor), 534 le16_to_cpu(dev->descriptor.idProduct)); 535 if (get_alias_id(dev, &id)) 536 quirk = get_alias_quirk(dev, id); 537 if (quirk && quirk->ifnum >= 0 && ifnum != quirk->ifnum) 538 return -ENXIO; 539 540 err = snd_usb_apply_boot_quirk(dev, intf, quirk, id); 541 if (err < 0) 542 return err; 543 544 /* 545 * found a config. now register to ALSA 546 */ 547 548 /* check whether it's already registered */ 549 chip = NULL; 550 mutex_lock(®ister_mutex); 551 for (i = 0; i < SNDRV_CARDS; i++) { 552 if (usb_chip[i] && usb_chip[i]->dev == dev) { 553 if (atomic_read(&usb_chip[i]->shutdown)) { 554 dev_err(&dev->dev, "USB device is in the shutdown state, cannot create a card instance\n"); 555 err = -EIO; 556 goto __error; 557 } 558 chip = usb_chip[i]; 559 atomic_inc(&chip->active); /* avoid autopm */ 560 break; 561 } 562 } 563 if (! chip) { 564 /* it's a fresh one. 565 * now look for an empty slot and create a new card instance 566 */ 567 for (i = 0; i < SNDRV_CARDS; i++) 568 if (enable[i] && ! usb_chip[i] && 569 (vid[i] == -1 || vid[i] == USB_ID_VENDOR(id)) && 570 (pid[i] == -1 || pid[i] == USB_ID_PRODUCT(id))) { 571 err = snd_usb_audio_create(intf, dev, i, quirk, 572 id, &chip); 573 if (err < 0) 574 goto __error; 575 chip->pm_intf = intf; 576 break; 577 } 578 if (!chip) { 579 dev_err(&dev->dev, "no available usb audio device\n"); 580 err = -ENODEV; 581 goto __error; 582 } 583 } 584 dev_set_drvdata(&dev->dev, chip); 585 586 /* 587 * For devices with more than one control interface, we assume the 588 * first contains the audio controls. We might need a more specific 589 * check here in the future. 590 */ 591 if (!chip->ctrl_intf) 592 chip->ctrl_intf = alts; 593 594 chip->txfr_quirk = 0; 595 err = 1; /* continue */ 596 if (quirk && quirk->ifnum != QUIRK_NO_INTERFACE) { 597 /* need some special handlings */ 598 err = snd_usb_create_quirk(chip, intf, &usb_audio_driver, quirk); 599 if (err < 0) 600 goto __error; 601 } 602 603 if (err > 0) { 604 /* create normal USB audio interfaces */ 605 err = snd_usb_create_streams(chip, ifnum); 606 if (err < 0) 607 goto __error; 608 err = snd_usb_create_mixer(chip, ifnum, ignore_ctl_error); 609 if (err < 0) 610 goto __error; 611 } 612 613 /* we are allowed to call snd_card_register() many times */ 614 err = snd_card_register(chip->card); 615 if (err < 0) 616 goto __error; 617 618 usb_chip[chip->index] = chip; 619 chip->num_interfaces++; 620 usb_set_intfdata(intf, chip); 621 atomic_dec(&chip->active); 622 mutex_unlock(®ister_mutex); 623 return 0; 624 625 __error: 626 if (chip) { 627 if (!chip->num_interfaces) 628 snd_card_free(chip->card); 629 atomic_dec(&chip->active); 630 } 631 mutex_unlock(®ister_mutex); 632 return err; 633 } 634 635 /* 636 * we need to take care of counter, since disconnection can be called also 637 * many times as well as usb_audio_probe(). 638 */ 639 static void usb_audio_disconnect(struct usb_interface *intf) 640 { 641 struct snd_usb_audio *chip = usb_get_intfdata(intf); 642 struct snd_card *card; 643 struct list_head *p; 644 645 if (chip == (void *)-1L) 646 return; 647 648 card = chip->card; 649 650 mutex_lock(®ister_mutex); 651 if (atomic_inc_return(&chip->shutdown) == 1) { 652 struct snd_usb_stream *as; 653 struct snd_usb_endpoint *ep; 654 struct usb_mixer_interface *mixer; 655 656 /* wait until all pending tasks done; 657 * they are protected by snd_usb_lock_shutdown() 658 */ 659 wait_event(chip->shutdown_wait, 660 !atomic_read(&chip->usage_count)); 661 snd_card_disconnect(card); 662 /* release the pcm resources */ 663 list_for_each_entry(as, &chip->pcm_list, list) { 664 snd_usb_stream_disconnect(as); 665 } 666 /* release the endpoint resources */ 667 list_for_each_entry(ep, &chip->ep_list, list) { 668 snd_usb_endpoint_release(ep); 669 } 670 /* release the midi resources */ 671 list_for_each(p, &chip->midi_list) { 672 snd_usbmidi_disconnect(p); 673 } 674 /* release mixer resources */ 675 list_for_each_entry(mixer, &chip->mixer_list, list) { 676 snd_usb_mixer_disconnect(mixer); 677 } 678 } 679 680 chip->num_interfaces--; 681 if (chip->num_interfaces <= 0) { 682 usb_chip[chip->index] = NULL; 683 mutex_unlock(®ister_mutex); 684 snd_card_free_when_closed(card); 685 } else { 686 mutex_unlock(®ister_mutex); 687 } 688 } 689 690 /* lock the shutdown (disconnect) task and autoresume */ 691 int snd_usb_lock_shutdown(struct snd_usb_audio *chip) 692 { 693 int err; 694 695 atomic_inc(&chip->usage_count); 696 if (atomic_read(&chip->shutdown)) { 697 err = -EIO; 698 goto error; 699 } 700 err = snd_usb_autoresume(chip); 701 if (err < 0) 702 goto error; 703 return 0; 704 705 error: 706 if (atomic_dec_and_test(&chip->usage_count)) 707 wake_up(&chip->shutdown_wait); 708 return err; 709 } 710 711 /* autosuspend and unlock the shutdown */ 712 void snd_usb_unlock_shutdown(struct snd_usb_audio *chip) 713 { 714 snd_usb_autosuspend(chip); 715 if (atomic_dec_and_test(&chip->usage_count)) 716 wake_up(&chip->shutdown_wait); 717 } 718 719 #ifdef CONFIG_PM 720 721 int snd_usb_autoresume(struct snd_usb_audio *chip) 722 { 723 if (atomic_read(&chip->shutdown)) 724 return -EIO; 725 if (atomic_inc_return(&chip->active) == 1) 726 return usb_autopm_get_interface(chip->pm_intf); 727 return 0; 728 } 729 730 void snd_usb_autosuspend(struct snd_usb_audio *chip) 731 { 732 if (atomic_read(&chip->shutdown)) 733 return; 734 if (atomic_dec_and_test(&chip->active)) 735 usb_autopm_put_interface(chip->pm_intf); 736 } 737 738 static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message) 739 { 740 struct snd_usb_audio *chip = usb_get_intfdata(intf); 741 struct snd_usb_stream *as; 742 struct usb_mixer_interface *mixer; 743 struct list_head *p; 744 745 if (chip == (void *)-1L) 746 return 0; 747 748 chip->autosuspended = !!PMSG_IS_AUTO(message); 749 if (!chip->autosuspended) 750 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot); 751 if (!chip->num_suspended_intf++) { 752 list_for_each_entry(as, &chip->pcm_list, list) { 753 snd_pcm_suspend_all(as->pcm); 754 as->substream[0].need_setup_ep = 755 as->substream[1].need_setup_ep = true; 756 } 757 list_for_each(p, &chip->midi_list) 758 snd_usbmidi_suspend(p); 759 list_for_each_entry(mixer, &chip->mixer_list, list) 760 snd_usb_mixer_suspend(mixer); 761 } 762 763 return 0; 764 } 765 766 static int __usb_audio_resume(struct usb_interface *intf, bool reset_resume) 767 { 768 struct snd_usb_audio *chip = usb_get_intfdata(intf); 769 struct usb_mixer_interface *mixer; 770 struct list_head *p; 771 int err = 0; 772 773 if (chip == (void *)-1L) 774 return 0; 775 if (--chip->num_suspended_intf) 776 return 0; 777 778 atomic_inc(&chip->active); /* avoid autopm */ 779 /* 780 * ALSA leaves material resumption to user space 781 * we just notify and restart the mixers 782 */ 783 list_for_each_entry(mixer, &chip->mixer_list, list) { 784 err = snd_usb_mixer_resume(mixer, reset_resume); 785 if (err < 0) 786 goto err_out; 787 } 788 789 list_for_each(p, &chip->midi_list) { 790 snd_usbmidi_resume(p); 791 } 792 793 if (!chip->autosuspended) 794 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0); 795 chip->autosuspended = 0; 796 797 err_out: 798 atomic_dec(&chip->active); /* allow autopm after this point */ 799 return err; 800 } 801 802 static int usb_audio_resume(struct usb_interface *intf) 803 { 804 return __usb_audio_resume(intf, false); 805 } 806 807 static int usb_audio_reset_resume(struct usb_interface *intf) 808 { 809 return __usb_audio_resume(intf, true); 810 } 811 #else 812 #define usb_audio_suspend NULL 813 #define usb_audio_resume NULL 814 #define usb_audio_reset_resume NULL 815 #endif /* CONFIG_PM */ 816 817 static struct usb_device_id usb_audio_ids [] = { 818 #include "quirks-table.h" 819 { .match_flags = (USB_DEVICE_ID_MATCH_INT_CLASS | USB_DEVICE_ID_MATCH_INT_SUBCLASS), 820 .bInterfaceClass = USB_CLASS_AUDIO, 821 .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL }, 822 { } /* Terminating entry */ 823 }; 824 MODULE_DEVICE_TABLE(usb, usb_audio_ids); 825 826 /* 827 * entry point for linux usb interface 828 */ 829 830 static struct usb_driver usb_audio_driver = { 831 .name = "snd-usb-audio", 832 .probe = usb_audio_probe, 833 .disconnect = usb_audio_disconnect, 834 .suspend = usb_audio_suspend, 835 .resume = usb_audio_resume, 836 .reset_resume = usb_audio_reset_resume, 837 .id_table = usb_audio_ids, 838 .supports_autosuspend = 1, 839 }; 840 841 module_usb_driver(usb_audio_driver); 842