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 #include "media.h" 70 71 MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>"); 72 MODULE_DESCRIPTION("USB Audio"); 73 MODULE_LICENSE("GPL"); 74 MODULE_SUPPORTED_DEVICE("{{Generic,USB Audio}}"); 75 76 77 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */ 78 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */ 79 static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;/* Enable this card */ 80 /* Vendor/product IDs for this card */ 81 static int vid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 }; 82 static int pid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 }; 83 static int device_setup[SNDRV_CARDS]; /* device parameter for this card */ 84 static bool ignore_ctl_error; 85 static bool autoclock = true; 86 static char *quirk_alias[SNDRV_CARDS]; 87 88 module_param_array(index, int, NULL, 0444); 89 MODULE_PARM_DESC(index, "Index value for the USB audio adapter."); 90 module_param_array(id, charp, NULL, 0444); 91 MODULE_PARM_DESC(id, "ID string for the USB audio adapter."); 92 module_param_array(enable, bool, NULL, 0444); 93 MODULE_PARM_DESC(enable, "Enable USB audio adapter."); 94 module_param_array(vid, int, NULL, 0444); 95 MODULE_PARM_DESC(vid, "Vendor ID for the USB audio device."); 96 module_param_array(pid, int, NULL, 0444); 97 MODULE_PARM_DESC(pid, "Product ID for the USB audio device."); 98 module_param_array(device_setup, int, NULL, 0444); 99 MODULE_PARM_DESC(device_setup, "Specific device setup (if needed)."); 100 module_param(ignore_ctl_error, bool, 0444); 101 MODULE_PARM_DESC(ignore_ctl_error, 102 "Ignore errors from USB controller for mixer interfaces."); 103 module_param(autoclock, bool, 0444); 104 MODULE_PARM_DESC(autoclock, "Enable auto-clock selection for UAC2 devices (default: yes)."); 105 module_param_array(quirk_alias, charp, NULL, 0444); 106 MODULE_PARM_DESC(quirk_alias, "Quirk aliases, e.g. 0123abcd:5678beef."); 107 108 /* 109 * we keep the snd_usb_audio_t instances by ourselves for merging 110 * the all interfaces on the same card as one sound device. 111 */ 112 113 static DEFINE_MUTEX(register_mutex); 114 static struct snd_usb_audio *usb_chip[SNDRV_CARDS]; 115 static struct usb_driver usb_audio_driver; 116 117 /* 118 * disconnect streams 119 * called from usb_audio_disconnect() 120 */ 121 static void snd_usb_stream_disconnect(struct snd_usb_stream *as) 122 { 123 int idx; 124 struct snd_usb_substream *subs; 125 126 for (idx = 0; idx < 2; idx++) { 127 subs = &as->substream[idx]; 128 if (!subs->num_formats) 129 continue; 130 subs->interface = -1; 131 subs->data_endpoint = NULL; 132 subs->sync_endpoint = NULL; 133 } 134 } 135 136 static int snd_usb_create_stream(struct snd_usb_audio *chip, int ctrlif, int interface) 137 { 138 struct usb_device *dev = chip->dev; 139 struct usb_host_interface *alts; 140 struct usb_interface_descriptor *altsd; 141 struct usb_interface *iface = usb_ifnum_to_if(dev, interface); 142 143 if (!iface) { 144 dev_err(&dev->dev, "%u:%d : does not exist\n", 145 ctrlif, interface); 146 return -EINVAL; 147 } 148 149 alts = &iface->altsetting[0]; 150 altsd = get_iface_desc(alts); 151 152 /* 153 * Android with both accessory and audio interfaces enabled gets the 154 * interface numbers wrong. 155 */ 156 if ((chip->usb_id == USB_ID(0x18d1, 0x2d04) || 157 chip->usb_id == USB_ID(0x18d1, 0x2d05)) && 158 interface == 0 && 159 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC && 160 altsd->bInterfaceSubClass == USB_SUBCLASS_VENDOR_SPEC) { 161 interface = 2; 162 iface = usb_ifnum_to_if(dev, interface); 163 if (!iface) 164 return -EINVAL; 165 alts = &iface->altsetting[0]; 166 altsd = get_iface_desc(alts); 167 } 168 169 if (usb_interface_claimed(iface)) { 170 dev_dbg(&dev->dev, "%d:%d: skipping, already claimed\n", 171 ctrlif, interface); 172 return -EINVAL; 173 } 174 175 if ((altsd->bInterfaceClass == USB_CLASS_AUDIO || 176 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC) && 177 altsd->bInterfaceSubClass == USB_SUBCLASS_MIDISTREAMING) { 178 int err = __snd_usbmidi_create(chip->card, iface, 179 &chip->midi_list, NULL, 180 chip->usb_id); 181 if (err < 0) { 182 dev_err(&dev->dev, 183 "%u:%d: cannot create sequencer device\n", 184 ctrlif, interface); 185 return -EINVAL; 186 } 187 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L); 188 189 return 0; 190 } 191 192 if ((altsd->bInterfaceClass != USB_CLASS_AUDIO && 193 altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) || 194 altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING) { 195 dev_dbg(&dev->dev, 196 "%u:%d: skipping non-supported interface %d\n", 197 ctrlif, interface, altsd->bInterfaceClass); 198 /* skip non-supported classes */ 199 return -EINVAL; 200 } 201 202 if (snd_usb_get_speed(dev) == USB_SPEED_LOW) { 203 dev_err(&dev->dev, "low speed audio streaming not supported\n"); 204 return -EINVAL; 205 } 206 207 if (! snd_usb_parse_audio_interface(chip, interface)) { 208 usb_set_interface(dev, interface, 0); /* reset the current interface */ 209 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L); 210 return -EINVAL; 211 } 212 213 return 0; 214 } 215 216 /* 217 * parse audio control descriptor and create pcm/midi streams 218 */ 219 static int snd_usb_create_streams(struct snd_usb_audio *chip, int ctrlif) 220 { 221 struct usb_device *dev = chip->dev; 222 struct usb_host_interface *host_iface; 223 struct usb_interface_descriptor *altsd; 224 void *control_header; 225 int i, protocol; 226 227 /* find audiocontrol interface */ 228 host_iface = &usb_ifnum_to_if(dev, ctrlif)->altsetting[0]; 229 control_header = snd_usb_find_csint_desc(host_iface->extra, 230 host_iface->extralen, 231 NULL, UAC_HEADER); 232 altsd = get_iface_desc(host_iface); 233 protocol = altsd->bInterfaceProtocol; 234 235 if (!control_header) { 236 dev_err(&dev->dev, "cannot find UAC_HEADER\n"); 237 return -EINVAL; 238 } 239 240 switch (protocol) { 241 default: 242 dev_warn(&dev->dev, 243 "unknown interface protocol %#02x, assuming v1\n", 244 protocol); 245 /* fall through */ 246 247 case UAC_VERSION_1: { 248 struct uac1_ac_header_descriptor *h1 = control_header; 249 250 if (!h1->bInCollection) { 251 dev_info(&dev->dev, "skipping empty audio interface (v1)\n"); 252 return -EINVAL; 253 } 254 255 if (h1->bLength < sizeof(*h1) + h1->bInCollection) { 256 dev_err(&dev->dev, "invalid UAC_HEADER (v1)\n"); 257 return -EINVAL; 258 } 259 260 for (i = 0; i < h1->bInCollection; i++) 261 snd_usb_create_stream(chip, ctrlif, h1->baInterfaceNr[i]); 262 263 break; 264 } 265 266 case UAC_VERSION_2: { 267 struct usb_interface_assoc_descriptor *assoc = 268 usb_ifnum_to_if(dev, ctrlif)->intf_assoc; 269 270 if (!assoc) { 271 /* 272 * Firmware writers cannot count to three. So to find 273 * the IAD on the NuForce UDH-100, also check the next 274 * interface. 275 */ 276 struct usb_interface *iface = 277 usb_ifnum_to_if(dev, ctrlif + 1); 278 if (iface && 279 iface->intf_assoc && 280 iface->intf_assoc->bFunctionClass == USB_CLASS_AUDIO && 281 iface->intf_assoc->bFunctionProtocol == UAC_VERSION_2) 282 assoc = iface->intf_assoc; 283 } 284 285 if (!assoc) { 286 dev_err(&dev->dev, "Audio class v2 interfaces need an interface association\n"); 287 return -EINVAL; 288 } 289 290 for (i = 0; i < assoc->bInterfaceCount; i++) { 291 int intf = assoc->bFirstInterface + i; 292 293 if (intf != ctrlif) 294 snd_usb_create_stream(chip, ctrlif, intf); 295 } 296 297 break; 298 } 299 } 300 301 return 0; 302 } 303 304 /* 305 * free the chip instance 306 * 307 * here we have to do not much, since pcm and controls are already freed 308 * 309 */ 310 311 static int snd_usb_audio_free(struct snd_usb_audio *chip) 312 { 313 struct snd_usb_endpoint *ep, *n; 314 315 list_for_each_entry_safe(ep, n, &chip->ep_list, list) 316 snd_usb_endpoint_free(ep); 317 318 mutex_destroy(&chip->mutex); 319 dev_set_drvdata(&chip->dev->dev, NULL); 320 kfree(chip); 321 return 0; 322 } 323 324 static int snd_usb_audio_dev_free(struct snd_device *device) 325 { 326 struct snd_usb_audio *chip = device->device_data; 327 return snd_usb_audio_free(chip); 328 } 329 330 /* 331 * create a chip instance and set its names. 332 */ 333 static int snd_usb_audio_create(struct usb_interface *intf, 334 struct usb_device *dev, int idx, 335 const struct snd_usb_audio_quirk *quirk, 336 struct snd_usb_audio **rchip) 337 { 338 struct snd_card *card; 339 struct snd_usb_audio *chip; 340 int err, len; 341 char component[14]; 342 static struct snd_device_ops ops = { 343 .dev_free = snd_usb_audio_dev_free, 344 }; 345 346 *rchip = NULL; 347 348 switch (snd_usb_get_speed(dev)) { 349 case USB_SPEED_LOW: 350 case USB_SPEED_FULL: 351 case USB_SPEED_HIGH: 352 case USB_SPEED_WIRELESS: 353 case USB_SPEED_SUPER: 354 break; 355 default: 356 dev_err(&dev->dev, "unknown device speed %d\n", snd_usb_get_speed(dev)); 357 return -ENXIO; 358 } 359 360 err = snd_card_new(&intf->dev, index[idx], id[idx], THIS_MODULE, 361 0, &card); 362 if (err < 0) { 363 dev_err(&dev->dev, "cannot create card instance %d\n", idx); 364 return err; 365 } 366 367 chip = kzalloc(sizeof(*chip), GFP_KERNEL); 368 if (! chip) { 369 snd_card_free(card); 370 return -ENOMEM; 371 } 372 373 mutex_init(&chip->mutex); 374 init_waitqueue_head(&chip->shutdown_wait); 375 chip->index = idx; 376 chip->dev = dev; 377 chip->card = card; 378 chip->setup = device_setup[idx]; 379 chip->autoclock = autoclock; 380 atomic_set(&chip->active, 1); /* avoid autopm during probing */ 381 atomic_set(&chip->usage_count, 0); 382 atomic_set(&chip->shutdown, 0); 383 384 chip->usb_id = USB_ID(le16_to_cpu(dev->descriptor.idVendor), 385 le16_to_cpu(dev->descriptor.idProduct)); 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 default: 455 break; 456 } 457 458 snd_usb_audio_create_proc(chip); 459 460 *rchip = chip; 461 return 0; 462 } 463 464 /* look for a matching quirk alias id */ 465 static bool get_alias_id(struct usb_device *dev, unsigned int *id) 466 { 467 int i; 468 unsigned int src, dst; 469 470 for (i = 0; i < ARRAY_SIZE(quirk_alias); i++) { 471 if (!quirk_alias[i] || 472 sscanf(quirk_alias[i], "%x:%x", &src, &dst) != 2 || 473 src != *id) 474 continue; 475 dev_info(&dev->dev, 476 "device (%04x:%04x): applying quirk alias %04x:%04x\n", 477 USB_ID_VENDOR(*id), USB_ID_PRODUCT(*id), 478 USB_ID_VENDOR(dst), USB_ID_PRODUCT(dst)); 479 *id = dst; 480 return true; 481 } 482 483 return false; 484 } 485 486 static struct usb_device_id usb_audio_ids[]; /* defined below */ 487 488 /* look for the corresponding quirk */ 489 static const struct snd_usb_audio_quirk * 490 get_alias_quirk(struct usb_device *dev, unsigned int id) 491 { 492 const struct usb_device_id *p; 493 494 for (p = usb_audio_ids; p->match_flags; p++) { 495 /* FIXME: this checks only vendor:product pair in the list */ 496 if ((p->match_flags & USB_DEVICE_ID_MATCH_DEVICE) == 497 USB_DEVICE_ID_MATCH_DEVICE && 498 p->idVendor == USB_ID_VENDOR(id) && 499 p->idProduct == USB_ID_PRODUCT(id)) 500 return (const struct snd_usb_audio_quirk *)p->driver_info; 501 } 502 503 return NULL; 504 } 505 506 /* 507 * probe the active usb device 508 * 509 * note that this can be called multiple times per a device, when it 510 * includes multiple audio control interfaces. 511 * 512 * thus we check the usb device pointer and creates the card instance 513 * only at the first time. the successive calls of this function will 514 * append the pcm interface to the corresponding card. 515 */ 516 static int usb_audio_probe(struct usb_interface *intf, 517 const struct usb_device_id *usb_id) 518 { 519 struct usb_device *dev = interface_to_usbdev(intf); 520 const struct snd_usb_audio_quirk *quirk = 521 (const struct snd_usb_audio_quirk *)usb_id->driver_info; 522 struct snd_usb_audio *chip; 523 int i, err; 524 struct usb_host_interface *alts; 525 int ifnum; 526 u32 id; 527 528 alts = &intf->altsetting[0]; 529 ifnum = get_iface_desc(alts)->bInterfaceNumber; 530 id = USB_ID(le16_to_cpu(dev->descriptor.idVendor), 531 le16_to_cpu(dev->descriptor.idProduct)); 532 if (get_alias_id(dev, &id)) 533 quirk = get_alias_quirk(dev, id); 534 if (quirk && quirk->ifnum >= 0 && ifnum != quirk->ifnum) 535 return -ENXIO; 536 537 err = snd_usb_apply_boot_quirk(dev, intf, quirk, id); 538 if (err < 0) 539 return err; 540 541 /* 542 * found a config. now register to ALSA 543 */ 544 545 /* check whether it's already registered */ 546 chip = NULL; 547 mutex_lock(®ister_mutex); 548 for (i = 0; i < SNDRV_CARDS; i++) { 549 if (usb_chip[i] && usb_chip[i]->dev == dev) { 550 if (atomic_read(&usb_chip[i]->shutdown)) { 551 dev_err(&dev->dev, "USB device is in the shutdown state, cannot create a card instance\n"); 552 err = -EIO; 553 goto __error; 554 } 555 chip = usb_chip[i]; 556 dev_set_drvdata(&dev->dev, chip); 557 atomic_inc(&chip->active); /* avoid autopm */ 558 break; 559 } 560 } 561 if (! chip) { 562 /* it's a fresh one. 563 * now look for an empty slot and create a new card instance 564 */ 565 for (i = 0; i < SNDRV_CARDS; i++) 566 if (enable[i] && ! usb_chip[i] && 567 (vid[i] == -1 || vid[i] == USB_ID_VENDOR(id)) && 568 (pid[i] == -1 || pid[i] == USB_ID_PRODUCT(id))) { 569 err = snd_usb_audio_create(intf, dev, i, quirk, 570 &chip); 571 if (err < 0) 572 goto __error; 573 chip->pm_intf = intf; 574 break; 575 } 576 if (!chip) { 577 dev_err(&dev->dev, "no available usb audio device\n"); 578 err = -ENODEV; 579 goto __error; 580 } 581 } 582 583 /* 584 * For devices with more than one control interface, we assume the 585 * first contains the audio controls. We might need a more specific 586 * check here in the future. 587 */ 588 if (!chip->ctrl_intf) 589 chip->ctrl_intf = alts; 590 591 chip->txfr_quirk = 0; 592 err = 1; /* continue */ 593 if (quirk && quirk->ifnum != QUIRK_NO_INTERFACE) { 594 /* need some special handlings */ 595 err = snd_usb_create_quirk(chip, intf, &usb_audio_driver, quirk); 596 if (err < 0) 597 goto __error; 598 } 599 600 if (err > 0) { 601 /* create normal USB audio interfaces */ 602 err = snd_usb_create_streams(chip, ifnum); 603 if (err < 0) 604 goto __error; 605 err = snd_usb_create_mixer(chip, ifnum, ignore_ctl_error); 606 if (err < 0) 607 goto __error; 608 } 609 610 /* we are allowed to call snd_card_register() many times */ 611 err = snd_card_register(chip->card); 612 if (err < 0) 613 goto __error; 614 615 if (quirk->media_device) { 616 /* don't want to fail when media_snd_device_create() fails */ 617 media_snd_device_create(chip, intf); 618 } 619 620 usb_chip[chip->index] = chip; 621 chip->num_interfaces++; 622 usb_set_intfdata(intf, chip); 623 atomic_dec(&chip->active); 624 mutex_unlock(®ister_mutex); 625 return 0; 626 627 __error: 628 if (chip) { 629 if (!chip->num_interfaces) 630 snd_card_free(chip->card); 631 atomic_dec(&chip->active); 632 } 633 mutex_unlock(®ister_mutex); 634 return err; 635 } 636 637 /* 638 * we need to take care of counter, since disconnection can be called also 639 * many times as well as usb_audio_probe(). 640 */ 641 static void usb_audio_disconnect(struct usb_interface *intf) 642 { 643 struct snd_usb_audio *chip = usb_get_intfdata(intf); 644 struct snd_card *card; 645 struct list_head *p; 646 647 if (chip == (void *)-1L) 648 return; 649 650 card = chip->card; 651 652 mutex_lock(®ister_mutex); 653 if (atomic_inc_return(&chip->shutdown) == 1) { 654 struct snd_usb_stream *as; 655 struct snd_usb_endpoint *ep; 656 struct usb_mixer_interface *mixer; 657 658 /* wait until all pending tasks done; 659 * they are protected by snd_usb_lock_shutdown() 660 */ 661 wait_event(chip->shutdown_wait, 662 !atomic_read(&chip->usage_count)); 663 snd_card_disconnect(card); 664 /* release the pcm resources */ 665 list_for_each_entry(as, &chip->pcm_list, list) { 666 snd_usb_stream_disconnect(as); 667 } 668 /* release the endpoint resources */ 669 list_for_each_entry(ep, &chip->ep_list, list) { 670 snd_usb_endpoint_release(ep); 671 } 672 /* release the midi resources */ 673 list_for_each(p, &chip->midi_list) { 674 snd_usbmidi_disconnect(p); 675 } 676 /* 677 * Nice to check quirk && quirk->media_device 678 * need some special handlings. Doesn't look like 679 * we have access to quirk here 680 * Acceses mixer_list 681 */ 682 media_snd_device_delete(chip); 683 684 /* release mixer resources */ 685 list_for_each_entry(mixer, &chip->mixer_list, list) { 686 snd_usb_mixer_disconnect(mixer); 687 } 688 } 689 690 chip->num_interfaces--; 691 if (chip->num_interfaces <= 0) { 692 usb_chip[chip->index] = NULL; 693 mutex_unlock(®ister_mutex); 694 snd_card_free_when_closed(card); 695 } else { 696 mutex_unlock(®ister_mutex); 697 } 698 } 699 700 /* lock the shutdown (disconnect) task and autoresume */ 701 int snd_usb_lock_shutdown(struct snd_usb_audio *chip) 702 { 703 int err; 704 705 atomic_inc(&chip->usage_count); 706 if (atomic_read(&chip->shutdown)) { 707 err = -EIO; 708 goto error; 709 } 710 err = snd_usb_autoresume(chip); 711 if (err < 0) 712 goto error; 713 return 0; 714 715 error: 716 if (atomic_dec_and_test(&chip->usage_count)) 717 wake_up(&chip->shutdown_wait); 718 return err; 719 } 720 721 /* autosuspend and unlock the shutdown */ 722 void snd_usb_unlock_shutdown(struct snd_usb_audio *chip) 723 { 724 snd_usb_autosuspend(chip); 725 if (atomic_dec_and_test(&chip->usage_count)) 726 wake_up(&chip->shutdown_wait); 727 } 728 729 #ifdef CONFIG_PM 730 731 int snd_usb_autoresume(struct snd_usb_audio *chip) 732 { 733 if (atomic_read(&chip->shutdown)) 734 return -EIO; 735 if (atomic_inc_return(&chip->active) == 1) 736 return usb_autopm_get_interface(chip->pm_intf); 737 return 0; 738 } 739 740 void snd_usb_autosuspend(struct snd_usb_audio *chip) 741 { 742 if (atomic_read(&chip->shutdown)) 743 return; 744 if (atomic_dec_and_test(&chip->active)) 745 usb_autopm_put_interface(chip->pm_intf); 746 } 747 748 static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message) 749 { 750 struct snd_usb_audio *chip = usb_get_intfdata(intf); 751 struct snd_usb_stream *as; 752 struct usb_mixer_interface *mixer; 753 struct list_head *p; 754 755 if (chip == (void *)-1L) 756 return 0; 757 758 chip->autosuspended = !!PMSG_IS_AUTO(message); 759 if (!chip->autosuspended) 760 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot); 761 if (!chip->num_suspended_intf++) { 762 list_for_each_entry(as, &chip->pcm_list, list) { 763 snd_pcm_suspend_all(as->pcm); 764 as->substream[0].need_setup_ep = 765 as->substream[1].need_setup_ep = true; 766 } 767 list_for_each(p, &chip->midi_list) 768 snd_usbmidi_suspend(p); 769 list_for_each_entry(mixer, &chip->mixer_list, list) 770 snd_usb_mixer_suspend(mixer); 771 } 772 773 return 0; 774 } 775 776 static int __usb_audio_resume(struct usb_interface *intf, bool reset_resume) 777 { 778 struct snd_usb_audio *chip = usb_get_intfdata(intf); 779 struct usb_mixer_interface *mixer; 780 struct list_head *p; 781 int err = 0; 782 783 if (chip == (void *)-1L) 784 return 0; 785 if (--chip->num_suspended_intf) 786 return 0; 787 788 atomic_inc(&chip->active); /* avoid autopm */ 789 /* 790 * ALSA leaves material resumption to user space 791 * we just notify and restart the mixers 792 */ 793 list_for_each_entry(mixer, &chip->mixer_list, list) { 794 err = snd_usb_mixer_resume(mixer, reset_resume); 795 if (err < 0) 796 goto err_out; 797 } 798 799 list_for_each(p, &chip->midi_list) { 800 snd_usbmidi_resume(p); 801 } 802 803 if (!chip->autosuspended) 804 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0); 805 chip->autosuspended = 0; 806 807 err_out: 808 atomic_dec(&chip->active); /* allow autopm after this point */ 809 return err; 810 } 811 812 static int usb_audio_resume(struct usb_interface *intf) 813 { 814 return __usb_audio_resume(intf, false); 815 } 816 817 static int usb_audio_reset_resume(struct usb_interface *intf) 818 { 819 return __usb_audio_resume(intf, true); 820 } 821 #else 822 #define usb_audio_suspend NULL 823 #define usb_audio_resume NULL 824 #define usb_audio_reset_resume NULL 825 #endif /* CONFIG_PM */ 826 827 static struct usb_device_id usb_audio_ids [] = { 828 #include "quirks-table.h" 829 { .match_flags = (USB_DEVICE_ID_MATCH_INT_CLASS | USB_DEVICE_ID_MATCH_INT_SUBCLASS), 830 .bInterfaceClass = USB_CLASS_AUDIO, 831 .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL }, 832 { } /* Terminating entry */ 833 }; 834 MODULE_DEVICE_TABLE(usb, usb_audio_ids); 835 836 /* 837 * entry point for linux usb interface 838 */ 839 840 static struct usb_driver usb_audio_driver = { 841 .name = "snd-usb-audio", 842 .probe = usb_audio_probe, 843 .disconnect = usb_audio_disconnect, 844 .suspend = usb_audio_suspend, 845 .resume = usb_audio_resume, 846 .reset_resume = usb_audio_reset_resume, 847 .id_table = usb_audio_ids, 848 .supports_autosuspend = 1, 849 }; 850 851 module_usb_driver(usb_audio_driver); 852