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 return -EINVAL; 210 } 211 212 return 0; 213 } 214 215 /* 216 * parse audio control descriptor and create pcm/midi streams 217 */ 218 static int snd_usb_create_streams(struct snd_usb_audio *chip, int ctrlif) 219 { 220 struct usb_device *dev = chip->dev; 221 struct usb_host_interface *host_iface; 222 struct usb_interface_descriptor *altsd; 223 void *control_header; 224 int i, protocol; 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 switch (protocol) { 240 default: 241 dev_warn(&dev->dev, 242 "unknown interface protocol %#02x, assuming v1\n", 243 protocol); 244 /* fall through */ 245 246 case UAC_VERSION_1: { 247 struct uac1_ac_header_descriptor *h1 = control_header; 248 249 if (!h1->bInCollection) { 250 dev_info(&dev->dev, "skipping empty audio interface (v1)\n"); 251 return -EINVAL; 252 } 253 254 if (h1->bLength < sizeof(*h1) + h1->bInCollection) { 255 dev_err(&dev->dev, "invalid UAC_HEADER (v1)\n"); 256 return -EINVAL; 257 } 258 259 for (i = 0; i < h1->bInCollection; i++) 260 snd_usb_create_stream(chip, ctrlif, h1->baInterfaceNr[i]); 261 262 break; 263 } 264 265 case UAC_VERSION_2: { 266 struct usb_interface_assoc_descriptor *assoc = 267 usb_ifnum_to_if(dev, ctrlif)->intf_assoc; 268 269 if (!assoc) { 270 /* 271 * Firmware writers cannot count to three. So to find 272 * the IAD on the NuForce UDH-100, also check the next 273 * interface. 274 */ 275 struct usb_interface *iface = 276 usb_ifnum_to_if(dev, ctrlif + 1); 277 if (iface && 278 iface->intf_assoc && 279 iface->intf_assoc->bFunctionClass == USB_CLASS_AUDIO && 280 iface->intf_assoc->bFunctionProtocol == UAC_VERSION_2) 281 assoc = iface->intf_assoc; 282 } 283 284 if (!assoc) { 285 dev_err(&dev->dev, "Audio class v2 interfaces need an interface association\n"); 286 return -EINVAL; 287 } 288 289 for (i = 0; i < assoc->bInterfaceCount; i++) { 290 int intf = assoc->bFirstInterface + i; 291 292 if (intf != ctrlif) 293 snd_usb_create_stream(chip, ctrlif, intf); 294 } 295 296 break; 297 } 298 } 299 300 return 0; 301 } 302 303 /* 304 * free the chip instance 305 * 306 * here we have to do not much, since pcm and controls are already freed 307 * 308 */ 309 310 static int snd_usb_audio_free(struct snd_usb_audio *chip) 311 { 312 struct snd_usb_endpoint *ep, *n; 313 314 list_for_each_entry_safe(ep, n, &chip->ep_list, list) 315 snd_usb_endpoint_free(ep); 316 317 mutex_destroy(&chip->mutex); 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 struct snd_usb_audio **rchip) 336 { 337 struct snd_card *card; 338 struct snd_usb_audio *chip; 339 int err, len; 340 char component[14]; 341 static struct snd_device_ops ops = { 342 .dev_free = snd_usb_audio_dev_free, 343 }; 344 345 *rchip = NULL; 346 347 switch (snd_usb_get_speed(dev)) { 348 case USB_SPEED_LOW: 349 case USB_SPEED_FULL: 350 case USB_SPEED_HIGH: 351 case USB_SPEED_WIRELESS: 352 case USB_SPEED_SUPER: 353 break; 354 default: 355 dev_err(&dev->dev, "unknown device speed %d\n", snd_usb_get_speed(dev)); 356 return -ENXIO; 357 } 358 359 err = snd_card_new(&intf->dev, index[idx], id[idx], THIS_MODULE, 360 0, &card); 361 if (err < 0) { 362 dev_err(&dev->dev, "cannot create card instance %d\n", idx); 363 return err; 364 } 365 366 chip = kzalloc(sizeof(*chip), GFP_KERNEL); 367 if (! chip) { 368 snd_card_free(card); 369 return -ENOMEM; 370 } 371 372 mutex_init(&chip->mutex); 373 init_waitqueue_head(&chip->shutdown_wait); 374 chip->index = idx; 375 chip->dev = dev; 376 chip->card = card; 377 chip->setup = device_setup[idx]; 378 chip->autoclock = autoclock; 379 atomic_set(&chip->active, 1); /* avoid autopm during probing */ 380 atomic_set(&chip->usage_count, 0); 381 atomic_set(&chip->shutdown, 0); 382 383 chip->usb_id = USB_ID(le16_to_cpu(dev->descriptor.idVendor), 384 le16_to_cpu(dev->descriptor.idProduct)); 385 INIT_LIST_HEAD(&chip->pcm_list); 386 INIT_LIST_HEAD(&chip->ep_list); 387 INIT_LIST_HEAD(&chip->midi_list); 388 INIT_LIST_HEAD(&chip->mixer_list); 389 390 if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) { 391 snd_usb_audio_free(chip); 392 snd_card_free(card); 393 return err; 394 } 395 396 strcpy(card->driver, "USB-Audio"); 397 sprintf(component, "USB%04x:%04x", 398 USB_ID_VENDOR(chip->usb_id), USB_ID_PRODUCT(chip->usb_id)); 399 snd_component_add(card, component); 400 401 /* retrieve the device string as shortname */ 402 if (quirk && quirk->product_name && *quirk->product_name) { 403 strlcpy(card->shortname, quirk->product_name, sizeof(card->shortname)); 404 } else { 405 if (!dev->descriptor.iProduct || 406 usb_string(dev, dev->descriptor.iProduct, 407 card->shortname, sizeof(card->shortname)) <= 0) { 408 /* no name available from anywhere, so use ID */ 409 sprintf(card->shortname, "USB Device %#04x:%#04x", 410 USB_ID_VENDOR(chip->usb_id), 411 USB_ID_PRODUCT(chip->usb_id)); 412 } 413 } 414 strim(card->shortname); 415 416 /* retrieve the vendor and device strings as longname */ 417 if (quirk && quirk->vendor_name && *quirk->vendor_name) { 418 len = strlcpy(card->longname, quirk->vendor_name, sizeof(card->longname)); 419 } else { 420 if (dev->descriptor.iManufacturer) 421 len = usb_string(dev, dev->descriptor.iManufacturer, 422 card->longname, sizeof(card->longname)); 423 else 424 len = 0; 425 /* we don't really care if there isn't any vendor string */ 426 } 427 if (len > 0) { 428 strim(card->longname); 429 if (*card->longname) 430 strlcat(card->longname, " ", sizeof(card->longname)); 431 } 432 433 strlcat(card->longname, card->shortname, sizeof(card->longname)); 434 435 len = strlcat(card->longname, " at ", sizeof(card->longname)); 436 437 if (len < sizeof(card->longname)) 438 usb_make_path(dev, card->longname + len, sizeof(card->longname) - len); 439 440 switch (snd_usb_get_speed(dev)) { 441 case USB_SPEED_LOW: 442 strlcat(card->longname, ", low speed", sizeof(card->longname)); 443 break; 444 case USB_SPEED_FULL: 445 strlcat(card->longname, ", full speed", sizeof(card->longname)); 446 break; 447 case USB_SPEED_HIGH: 448 strlcat(card->longname, ", high speed", sizeof(card->longname)); 449 break; 450 case USB_SPEED_SUPER: 451 strlcat(card->longname, ", super speed", sizeof(card->longname)); 452 break; 453 default: 454 break; 455 } 456 457 snd_usb_audio_create_proc(chip); 458 459 *rchip = chip; 460 return 0; 461 } 462 463 /* look for a matching quirk alias id */ 464 static bool get_alias_id(struct usb_device *dev, unsigned int *id) 465 { 466 int i; 467 unsigned int src, dst; 468 469 for (i = 0; i < ARRAY_SIZE(quirk_alias); i++) { 470 if (!quirk_alias[i] || 471 sscanf(quirk_alias[i], "%x:%x", &src, &dst) != 2 || 472 src != *id) 473 continue; 474 dev_info(&dev->dev, 475 "device (%04x:%04x): applying quirk alias %04x:%04x\n", 476 USB_ID_VENDOR(*id), USB_ID_PRODUCT(*id), 477 USB_ID_VENDOR(dst), USB_ID_PRODUCT(dst)); 478 *id = dst; 479 return true; 480 } 481 482 return false; 483 } 484 485 static struct usb_device_id usb_audio_ids[]; /* defined below */ 486 487 /* look for the corresponding quirk */ 488 static const struct snd_usb_audio_quirk * 489 get_alias_quirk(struct usb_device *dev, unsigned int id) 490 { 491 const struct usb_device_id *p; 492 493 for (p = usb_audio_ids; p->match_flags; p++) { 494 /* FIXME: this checks only vendor:product pair in the list */ 495 if ((p->match_flags & USB_DEVICE_ID_MATCH_DEVICE) == 496 USB_DEVICE_ID_MATCH_DEVICE && 497 p->idVendor == USB_ID_VENDOR(id) && 498 p->idProduct == USB_ID_PRODUCT(id)) 499 return (const struct snd_usb_audio_quirk *)p->driver_info; 500 } 501 502 return NULL; 503 } 504 505 /* 506 * probe the active usb device 507 * 508 * note that this can be called multiple times per a device, when it 509 * includes multiple audio control interfaces. 510 * 511 * thus we check the usb device pointer and creates the card instance 512 * only at the first time. the successive calls of this function will 513 * append the pcm interface to the corresponding card. 514 */ 515 static int usb_audio_probe(struct usb_interface *intf, 516 const struct usb_device_id *usb_id) 517 { 518 struct usb_device *dev = interface_to_usbdev(intf); 519 const struct snd_usb_audio_quirk *quirk = 520 (const struct snd_usb_audio_quirk *)usb_id->driver_info; 521 struct snd_usb_audio *chip; 522 int i, err; 523 struct usb_host_interface *alts; 524 int ifnum; 525 u32 id; 526 527 alts = &intf->altsetting[0]; 528 ifnum = get_iface_desc(alts)->bInterfaceNumber; 529 id = USB_ID(le16_to_cpu(dev->descriptor.idVendor), 530 le16_to_cpu(dev->descriptor.idProduct)); 531 if (get_alias_id(dev, &id)) 532 quirk = get_alias_quirk(dev, id); 533 if (quirk && quirk->ifnum >= 0 && ifnum != quirk->ifnum) 534 return -ENXIO; 535 536 err = snd_usb_apply_boot_quirk(dev, intf, quirk, id); 537 if (err < 0) 538 return err; 539 540 /* 541 * found a config. now register to ALSA 542 */ 543 544 /* check whether it's already registered */ 545 chip = NULL; 546 mutex_lock(®ister_mutex); 547 for (i = 0; i < SNDRV_CARDS; i++) { 548 if (usb_chip[i] && usb_chip[i]->dev == dev) { 549 if (atomic_read(&usb_chip[i]->shutdown)) { 550 dev_err(&dev->dev, "USB device is in the shutdown state, cannot create a card instance\n"); 551 err = -EIO; 552 goto __error; 553 } 554 chip = usb_chip[i]; 555 dev_set_drvdata(&dev->dev, chip); 556 atomic_inc(&chip->active); /* avoid autopm */ 557 break; 558 } 559 } 560 if (! chip) { 561 /* it's a fresh one. 562 * now look for an empty slot and create a new card instance 563 */ 564 for (i = 0; i < SNDRV_CARDS; i++) 565 if (enable[i] && ! usb_chip[i] && 566 (vid[i] == -1 || vid[i] == USB_ID_VENDOR(id)) && 567 (pid[i] == -1 || pid[i] == USB_ID_PRODUCT(id))) { 568 err = snd_usb_audio_create(intf, dev, i, quirk, 569 &chip); 570 if (err < 0) 571 goto __error; 572 chip->pm_intf = intf; 573 break; 574 } 575 if (!chip) { 576 dev_err(&dev->dev, "no available usb audio device\n"); 577 err = -ENODEV; 578 goto __error; 579 } 580 } 581 582 /* 583 * For devices with more than one control interface, we assume the 584 * first contains the audio controls. We might need a more specific 585 * check here in the future. 586 */ 587 if (!chip->ctrl_intf) 588 chip->ctrl_intf = alts; 589 590 chip->txfr_quirk = 0; 591 err = 1; /* continue */ 592 if (quirk && quirk->ifnum != QUIRK_NO_INTERFACE) { 593 /* need some special handlings */ 594 err = snd_usb_create_quirk(chip, intf, &usb_audio_driver, quirk); 595 if (err < 0) 596 goto __error; 597 } 598 599 if (err > 0) { 600 /* create normal USB audio interfaces */ 601 err = snd_usb_create_streams(chip, ifnum); 602 if (err < 0) 603 goto __error; 604 err = snd_usb_create_mixer(chip, ifnum, ignore_ctl_error); 605 if (err < 0) 606 goto __error; 607 } 608 609 /* we are allowed to call snd_card_register() many times */ 610 err = snd_card_register(chip->card); 611 if (err < 0) 612 goto __error; 613 614 usb_chip[chip->index] = chip; 615 chip->num_interfaces++; 616 usb_set_intfdata(intf, chip); 617 atomic_dec(&chip->active); 618 mutex_unlock(®ister_mutex); 619 return 0; 620 621 __error: 622 if (chip) { 623 if (!chip->num_interfaces) 624 snd_card_free(chip->card); 625 atomic_dec(&chip->active); 626 } 627 mutex_unlock(®ister_mutex); 628 return err; 629 } 630 631 /* 632 * we need to take care of counter, since disconnection can be called also 633 * many times as well as usb_audio_probe(). 634 */ 635 static void usb_audio_disconnect(struct usb_interface *intf) 636 { 637 struct snd_usb_audio *chip = usb_get_intfdata(intf); 638 struct snd_card *card; 639 struct list_head *p; 640 641 if (chip == (void *)-1L) 642 return; 643 644 card = chip->card; 645 646 mutex_lock(®ister_mutex); 647 if (atomic_inc_return(&chip->shutdown) == 1) { 648 struct snd_usb_stream *as; 649 struct snd_usb_endpoint *ep; 650 struct usb_mixer_interface *mixer; 651 652 /* wait until all pending tasks done; 653 * they are protected by snd_usb_lock_shutdown() 654 */ 655 wait_event(chip->shutdown_wait, 656 !atomic_read(&chip->usage_count)); 657 snd_card_disconnect(card); 658 /* release the pcm resources */ 659 list_for_each_entry(as, &chip->pcm_list, list) { 660 snd_usb_stream_disconnect(as); 661 } 662 /* release the endpoint resources */ 663 list_for_each_entry(ep, &chip->ep_list, list) { 664 snd_usb_endpoint_release(ep); 665 } 666 /* release the midi resources */ 667 list_for_each(p, &chip->midi_list) { 668 snd_usbmidi_disconnect(p); 669 } 670 /* release mixer resources */ 671 list_for_each_entry(mixer, &chip->mixer_list, list) { 672 snd_usb_mixer_disconnect(mixer); 673 } 674 } 675 676 chip->num_interfaces--; 677 if (chip->num_interfaces <= 0) { 678 usb_chip[chip->index] = NULL; 679 mutex_unlock(®ister_mutex); 680 snd_card_free_when_closed(card); 681 } else { 682 mutex_unlock(®ister_mutex); 683 } 684 } 685 686 /* lock the shutdown (disconnect) task and autoresume */ 687 int snd_usb_lock_shutdown(struct snd_usb_audio *chip) 688 { 689 int err; 690 691 atomic_inc(&chip->usage_count); 692 if (atomic_read(&chip->shutdown)) { 693 err = -EIO; 694 goto error; 695 } 696 err = snd_usb_autoresume(chip); 697 if (err < 0) 698 goto error; 699 return 0; 700 701 error: 702 if (atomic_dec_and_test(&chip->usage_count)) 703 wake_up(&chip->shutdown_wait); 704 return err; 705 } 706 707 /* autosuspend and unlock the shutdown */ 708 void snd_usb_unlock_shutdown(struct snd_usb_audio *chip) 709 { 710 snd_usb_autosuspend(chip); 711 if (atomic_dec_and_test(&chip->usage_count)) 712 wake_up(&chip->shutdown_wait); 713 } 714 715 #ifdef CONFIG_PM 716 717 int snd_usb_autoresume(struct snd_usb_audio *chip) 718 { 719 if (atomic_read(&chip->shutdown)) 720 return -EIO; 721 if (atomic_inc_return(&chip->active) == 1) 722 return usb_autopm_get_interface(chip->pm_intf); 723 return 0; 724 } 725 726 void snd_usb_autosuspend(struct snd_usb_audio *chip) 727 { 728 if (atomic_read(&chip->shutdown)) 729 return; 730 if (atomic_dec_and_test(&chip->active)) 731 usb_autopm_put_interface(chip->pm_intf); 732 } 733 734 static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message) 735 { 736 struct snd_usb_audio *chip = usb_get_intfdata(intf); 737 struct snd_usb_stream *as; 738 struct usb_mixer_interface *mixer; 739 struct list_head *p; 740 741 if (chip == (void *)-1L) 742 return 0; 743 744 chip->autosuspended = !!PMSG_IS_AUTO(message); 745 if (!chip->autosuspended) 746 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot); 747 if (!chip->num_suspended_intf++) { 748 list_for_each_entry(as, &chip->pcm_list, list) { 749 snd_pcm_suspend_all(as->pcm); 750 as->substream[0].need_setup_ep = 751 as->substream[1].need_setup_ep = true; 752 } 753 list_for_each(p, &chip->midi_list) 754 snd_usbmidi_suspend(p); 755 list_for_each_entry(mixer, &chip->mixer_list, list) 756 snd_usb_mixer_suspend(mixer); 757 } 758 759 return 0; 760 } 761 762 static int __usb_audio_resume(struct usb_interface *intf, bool reset_resume) 763 { 764 struct snd_usb_audio *chip = usb_get_intfdata(intf); 765 struct usb_mixer_interface *mixer; 766 struct list_head *p; 767 int err = 0; 768 769 if (chip == (void *)-1L) 770 return 0; 771 if (--chip->num_suspended_intf) 772 return 0; 773 774 atomic_inc(&chip->active); /* avoid autopm */ 775 /* 776 * ALSA leaves material resumption to user space 777 * we just notify and restart the mixers 778 */ 779 list_for_each_entry(mixer, &chip->mixer_list, list) { 780 err = snd_usb_mixer_resume(mixer, reset_resume); 781 if (err < 0) 782 goto err_out; 783 } 784 785 list_for_each(p, &chip->midi_list) { 786 snd_usbmidi_resume(p); 787 } 788 789 if (!chip->autosuspended) 790 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0); 791 chip->autosuspended = 0; 792 793 err_out: 794 atomic_dec(&chip->active); /* allow autopm after this point */ 795 return err; 796 } 797 798 static int usb_audio_resume(struct usb_interface *intf) 799 { 800 return __usb_audio_resume(intf, false); 801 } 802 803 static int usb_audio_reset_resume(struct usb_interface *intf) 804 { 805 return __usb_audio_resume(intf, true); 806 } 807 #else 808 #define usb_audio_suspend NULL 809 #define usb_audio_resume NULL 810 #define usb_audio_reset_resume NULL 811 #endif /* CONFIG_PM */ 812 813 static struct usb_device_id usb_audio_ids [] = { 814 #include "quirks-table.h" 815 { .match_flags = (USB_DEVICE_ID_MATCH_INT_CLASS | USB_DEVICE_ID_MATCH_INT_SUBCLASS), 816 .bInterfaceClass = USB_CLASS_AUDIO, 817 .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL }, 818 { } /* Terminating entry */ 819 }; 820 MODULE_DEVICE_TABLE(usb, usb_audio_ids); 821 822 /* 823 * entry point for linux usb interface 824 */ 825 826 static struct usb_driver usb_audio_driver = { 827 .name = "snd-usb-audio", 828 .probe = usb_audio_probe, 829 .disconnect = usb_audio_disconnect, 830 .suspend = usb_audio_suspend, 831 .resume = usb_audio_resume, 832 .reset_resume = usb_audio_reset_resume, 833 .id_table = usb_audio_ids, 834 .supports_autosuspend = 1, 835 }; 836 837 module_usb_driver(usb_audio_driver); 838