1 /* 2 * (Tentative) USB Audio Driver for ALSA 3 * 4 * Copyright (c) 2002 by Takashi Iwai <tiwai@suse.de> 5 * 6 * Many codes borrowed from audio.c by 7 * Alan Cox (alan@lxorguk.ukuu.org.uk) 8 * Thomas Sailer (sailer@ife.ee.ethz.ch) 9 * 10 * Audio Class 3.0 support by Ruslan Bilovol <ruslan.bilovol@gmail.com> 11 * 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of the GNU General Public License as published by 14 * the Free Software Foundation; either version 2 of the License, or 15 * (at your option) any later version. 16 * 17 * This program is distributed in the hope that it will be useful, 18 * but WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20 * GNU General Public License for more details. 21 * 22 * You should have received a copy of the GNU General Public License 23 * along with this program; if not, write to the Free Software 24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 25 * 26 * 27 * NOTES: 28 * 29 * - the linked URBs would be preferred but not used so far because of 30 * the instability of unlinking. 31 * - type II is not supported properly. there is no device which supports 32 * this type *correctly*. SB extigy looks as if it supports, but it's 33 * indeed an AC3 stream packed in SPDIF frames (i.e. no real AC3 stream). 34 */ 35 36 37 #include <linux/bitops.h> 38 #include <linux/init.h> 39 #include <linux/list.h> 40 #include <linux/slab.h> 41 #include <linux/string.h> 42 #include <linux/ctype.h> 43 #include <linux/usb.h> 44 #include <linux/moduleparam.h> 45 #include <linux/mutex.h> 46 #include <linux/usb/audio.h> 47 #include <linux/usb/audio-v2.h> 48 #include <linux/usb/audio-v3.h> 49 #include <linux/module.h> 50 51 #include <sound/control.h> 52 #include <sound/core.h> 53 #include <sound/info.h> 54 #include <sound/pcm.h> 55 #include <sound/pcm_params.h> 56 #include <sound/initval.h> 57 58 #include "usbaudio.h" 59 #include "card.h" 60 #include "midi.h" 61 #include "mixer.h" 62 #include "proc.h" 63 #include "quirks.h" 64 #include "endpoint.h" 65 #include "helper.h" 66 #include "debug.h" 67 #include "pcm.h" 68 #include "format.h" 69 #include "power.h" 70 #include "stream.h" 71 72 MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>"); 73 MODULE_DESCRIPTION("USB Audio"); 74 MODULE_LICENSE("GPL"); 75 MODULE_SUPPORTED_DEVICE("{{Generic,USB Audio}}"); 76 77 78 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */ 79 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */ 80 static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;/* Enable this card */ 81 /* Vendor/product IDs for this card */ 82 static int vid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 }; 83 static int pid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 }; 84 static int device_setup[SNDRV_CARDS]; /* device parameter for this card */ 85 static bool ignore_ctl_error; 86 static bool autoclock = true; 87 static char *quirk_alias[SNDRV_CARDS]; 88 89 module_param_array(index, int, NULL, 0444); 90 MODULE_PARM_DESC(index, "Index value for the USB audio adapter."); 91 module_param_array(id, charp, NULL, 0444); 92 MODULE_PARM_DESC(id, "ID string for the USB audio adapter."); 93 module_param_array(enable, bool, NULL, 0444); 94 MODULE_PARM_DESC(enable, "Enable USB audio adapter."); 95 module_param_array(vid, int, NULL, 0444); 96 MODULE_PARM_DESC(vid, "Vendor ID for the USB audio device."); 97 module_param_array(pid, int, NULL, 0444); 98 MODULE_PARM_DESC(pid, "Product ID for the USB audio device."); 99 module_param_array(device_setup, int, NULL, 0444); 100 MODULE_PARM_DESC(device_setup, "Specific device setup (if needed)."); 101 module_param(ignore_ctl_error, bool, 0444); 102 MODULE_PARM_DESC(ignore_ctl_error, 103 "Ignore errors from USB controller for mixer interfaces."); 104 module_param(autoclock, bool, 0444); 105 MODULE_PARM_DESC(autoclock, "Enable auto-clock selection for UAC2 devices (default: yes)."); 106 module_param_array(quirk_alias, charp, NULL, 0444); 107 MODULE_PARM_DESC(quirk_alias, "Quirk aliases, e.g. 0123abcd:5678beef."); 108 109 /* 110 * we keep the snd_usb_audio_t instances by ourselves for merging 111 * the all interfaces on the same card as one sound device. 112 */ 113 114 static DEFINE_MUTEX(register_mutex); 115 static struct snd_usb_audio *usb_chip[SNDRV_CARDS]; 116 static struct usb_driver usb_audio_driver; 117 118 /* 119 * disconnect streams 120 * called from usb_audio_disconnect() 121 */ 122 static void snd_usb_stream_disconnect(struct snd_usb_stream *as) 123 { 124 int idx; 125 struct snd_usb_substream *subs; 126 127 for (idx = 0; idx < 2; idx++) { 128 subs = &as->substream[idx]; 129 if (!subs->num_formats) 130 continue; 131 subs->interface = -1; 132 subs->data_endpoint = NULL; 133 subs->sync_endpoint = NULL; 134 } 135 } 136 137 static int snd_usb_create_stream(struct snd_usb_audio *chip, int ctrlif, int interface) 138 { 139 struct usb_device *dev = chip->dev; 140 struct usb_host_interface *alts; 141 struct usb_interface_descriptor *altsd; 142 struct usb_interface *iface = usb_ifnum_to_if(dev, interface); 143 144 if (!iface) { 145 dev_err(&dev->dev, "%u:%d : does not exist\n", 146 ctrlif, interface); 147 return -EINVAL; 148 } 149 150 alts = &iface->altsetting[0]; 151 altsd = get_iface_desc(alts); 152 153 /* 154 * Android with both accessory and audio interfaces enabled gets the 155 * interface numbers wrong. 156 */ 157 if ((chip->usb_id == USB_ID(0x18d1, 0x2d04) || 158 chip->usb_id == USB_ID(0x18d1, 0x2d05)) && 159 interface == 0 && 160 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC && 161 altsd->bInterfaceSubClass == USB_SUBCLASS_VENDOR_SPEC) { 162 interface = 2; 163 iface = usb_ifnum_to_if(dev, interface); 164 if (!iface) 165 return -EINVAL; 166 alts = &iface->altsetting[0]; 167 altsd = get_iface_desc(alts); 168 } 169 170 if (usb_interface_claimed(iface)) { 171 dev_dbg(&dev->dev, "%d:%d: skipping, already claimed\n", 172 ctrlif, interface); 173 return -EINVAL; 174 } 175 176 if ((altsd->bInterfaceClass == USB_CLASS_AUDIO || 177 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC) && 178 altsd->bInterfaceSubClass == USB_SUBCLASS_MIDISTREAMING) { 179 int err = __snd_usbmidi_create(chip->card, iface, 180 &chip->midi_list, NULL, 181 chip->usb_id); 182 if (err < 0) { 183 dev_err(&dev->dev, 184 "%u:%d: cannot create sequencer device\n", 185 ctrlif, interface); 186 return -EINVAL; 187 } 188 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L); 189 190 return 0; 191 } 192 193 if ((altsd->bInterfaceClass != USB_CLASS_AUDIO && 194 altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) || 195 altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING) { 196 dev_dbg(&dev->dev, 197 "%u:%d: skipping non-supported interface %d\n", 198 ctrlif, interface, altsd->bInterfaceClass); 199 /* skip non-supported classes */ 200 return -EINVAL; 201 } 202 203 if (snd_usb_get_speed(dev) == USB_SPEED_LOW) { 204 dev_err(&dev->dev, "low speed audio streaming not supported\n"); 205 return -EINVAL; 206 } 207 208 if (! snd_usb_parse_audio_interface(chip, interface)) { 209 usb_set_interface(dev, interface, 0); /* reset the current interface */ 210 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L); 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 int rest_bytes; 227 228 /* find audiocontrol interface */ 229 host_iface = &usb_ifnum_to_if(dev, ctrlif)->altsetting[0]; 230 control_header = snd_usb_find_csint_desc(host_iface->extra, 231 host_iface->extralen, 232 NULL, UAC_HEADER); 233 altsd = get_iface_desc(host_iface); 234 protocol = altsd->bInterfaceProtocol; 235 236 if (!control_header) { 237 dev_err(&dev->dev, "cannot find UAC_HEADER\n"); 238 return -EINVAL; 239 } 240 241 rest_bytes = (void *)(host_iface->extra + host_iface->extralen) - 242 control_header; 243 244 /* just to be sure -- this shouldn't hit at all */ 245 if (rest_bytes <= 0) { 246 dev_err(&dev->dev, "invalid control header\n"); 247 return -EINVAL; 248 } 249 250 switch (protocol) { 251 default: 252 dev_warn(&dev->dev, 253 "unknown interface protocol %#02x, assuming v1\n", 254 protocol); 255 /* fall through */ 256 257 case UAC_VERSION_1: { 258 struct uac1_ac_header_descriptor *h1 = control_header; 259 260 if (rest_bytes < sizeof(*h1)) { 261 dev_err(&dev->dev, "too short v1 buffer descriptor\n"); 262 return -EINVAL; 263 } 264 265 if (!h1->bInCollection) { 266 dev_info(&dev->dev, "skipping empty audio interface (v1)\n"); 267 return -EINVAL; 268 } 269 270 if (rest_bytes < h1->bLength) { 271 dev_err(&dev->dev, "invalid buffer length (v1)\n"); 272 return -EINVAL; 273 } 274 275 if (h1->bLength < sizeof(*h1) + h1->bInCollection) { 276 dev_err(&dev->dev, "invalid UAC_HEADER (v1)\n"); 277 return -EINVAL; 278 } 279 280 for (i = 0; i < h1->bInCollection; i++) 281 snd_usb_create_stream(chip, ctrlif, h1->baInterfaceNr[i]); 282 283 break; 284 } 285 286 case UAC_VERSION_2: 287 case UAC_VERSION_3: { 288 struct usb_interface_assoc_descriptor *assoc = 289 usb_ifnum_to_if(dev, ctrlif)->intf_assoc; 290 291 if (!assoc) { 292 /* 293 * Firmware writers cannot count to three. So to find 294 * the IAD on the NuForce UDH-100, also check the next 295 * interface. 296 */ 297 struct usb_interface *iface = 298 usb_ifnum_to_if(dev, ctrlif + 1); 299 if (iface && 300 iface->intf_assoc && 301 iface->intf_assoc->bFunctionClass == USB_CLASS_AUDIO && 302 iface->intf_assoc->bFunctionProtocol == UAC_VERSION_2) 303 assoc = iface->intf_assoc; 304 } 305 306 if (!assoc) { 307 dev_err(&dev->dev, "Audio class v2/v3 interfaces need an interface association\n"); 308 return -EINVAL; 309 } 310 311 for (i = 0; i < assoc->bInterfaceCount; i++) { 312 int intf = assoc->bFirstInterface + i; 313 314 if (intf != ctrlif) 315 snd_usb_create_stream(chip, ctrlif, intf); 316 } 317 318 break; 319 } 320 } 321 322 return 0; 323 } 324 325 /* 326 * free the chip instance 327 * 328 * here we have to do not much, since pcm and controls are already freed 329 * 330 */ 331 332 static int snd_usb_audio_free(struct snd_usb_audio *chip) 333 { 334 struct snd_usb_endpoint *ep, *n; 335 336 list_for_each_entry_safe(ep, n, &chip->ep_list, list) 337 snd_usb_endpoint_free(ep); 338 339 mutex_destroy(&chip->mutex); 340 if (!atomic_read(&chip->shutdown)) 341 dev_set_drvdata(&chip->dev->dev, NULL); 342 kfree(chip); 343 return 0; 344 } 345 346 static int snd_usb_audio_dev_free(struct snd_device *device) 347 { 348 struct snd_usb_audio *chip = device->device_data; 349 return snd_usb_audio_free(chip); 350 } 351 352 /* 353 * create a chip instance and set its names. 354 */ 355 static int snd_usb_audio_create(struct usb_interface *intf, 356 struct usb_device *dev, int idx, 357 const struct snd_usb_audio_quirk *quirk, 358 unsigned int usb_id, 359 struct snd_usb_audio **rchip) 360 { 361 struct snd_card *card; 362 struct snd_usb_audio *chip; 363 int err, len; 364 char component[14]; 365 static struct snd_device_ops ops = { 366 .dev_free = snd_usb_audio_dev_free, 367 }; 368 369 *rchip = NULL; 370 371 switch (snd_usb_get_speed(dev)) { 372 case USB_SPEED_LOW: 373 case USB_SPEED_FULL: 374 case USB_SPEED_HIGH: 375 case USB_SPEED_WIRELESS: 376 case USB_SPEED_SUPER: 377 case USB_SPEED_SUPER_PLUS: 378 break; 379 default: 380 dev_err(&dev->dev, "unknown device speed %d\n", snd_usb_get_speed(dev)); 381 return -ENXIO; 382 } 383 384 err = snd_card_new(&intf->dev, index[idx], id[idx], THIS_MODULE, 385 0, &card); 386 if (err < 0) { 387 dev_err(&dev->dev, "cannot create card instance %d\n", idx); 388 return err; 389 } 390 391 chip = kzalloc(sizeof(*chip), GFP_KERNEL); 392 if (! chip) { 393 snd_card_free(card); 394 return -ENOMEM; 395 } 396 397 mutex_init(&chip->mutex); 398 init_waitqueue_head(&chip->shutdown_wait); 399 chip->index = idx; 400 chip->dev = dev; 401 chip->card = card; 402 chip->setup = device_setup[idx]; 403 chip->autoclock = autoclock; 404 atomic_set(&chip->active, 1); /* avoid autopm during probing */ 405 atomic_set(&chip->usage_count, 0); 406 atomic_set(&chip->shutdown, 0); 407 408 chip->usb_id = usb_id; 409 INIT_LIST_HEAD(&chip->pcm_list); 410 INIT_LIST_HEAD(&chip->ep_list); 411 INIT_LIST_HEAD(&chip->midi_list); 412 INIT_LIST_HEAD(&chip->mixer_list); 413 414 if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) { 415 snd_usb_audio_free(chip); 416 snd_card_free(card); 417 return err; 418 } 419 420 strcpy(card->driver, "USB-Audio"); 421 sprintf(component, "USB%04x:%04x", 422 USB_ID_VENDOR(chip->usb_id), USB_ID_PRODUCT(chip->usb_id)); 423 snd_component_add(card, component); 424 425 /* retrieve the device string as shortname */ 426 if (quirk && quirk->product_name && *quirk->product_name) { 427 strlcpy(card->shortname, quirk->product_name, sizeof(card->shortname)); 428 } else { 429 if (!dev->descriptor.iProduct || 430 usb_string(dev, dev->descriptor.iProduct, 431 card->shortname, sizeof(card->shortname)) <= 0) { 432 /* no name available from anywhere, so use ID */ 433 sprintf(card->shortname, "USB Device %#04x:%#04x", 434 USB_ID_VENDOR(chip->usb_id), 435 USB_ID_PRODUCT(chip->usb_id)); 436 } 437 } 438 strim(card->shortname); 439 440 /* retrieve the vendor and device strings as longname */ 441 if (quirk && quirk->vendor_name && *quirk->vendor_name) { 442 len = strlcpy(card->longname, quirk->vendor_name, sizeof(card->longname)); 443 } else { 444 if (dev->descriptor.iManufacturer) 445 len = usb_string(dev, dev->descriptor.iManufacturer, 446 card->longname, sizeof(card->longname)); 447 else 448 len = 0; 449 /* we don't really care if there isn't any vendor string */ 450 } 451 if (len > 0) { 452 strim(card->longname); 453 if (*card->longname) 454 strlcat(card->longname, " ", sizeof(card->longname)); 455 } 456 457 strlcat(card->longname, card->shortname, sizeof(card->longname)); 458 459 len = strlcat(card->longname, " at ", sizeof(card->longname)); 460 461 if (len < sizeof(card->longname)) 462 usb_make_path(dev, card->longname + len, sizeof(card->longname) - len); 463 464 switch (snd_usb_get_speed(dev)) { 465 case USB_SPEED_LOW: 466 strlcat(card->longname, ", low speed", sizeof(card->longname)); 467 break; 468 case USB_SPEED_FULL: 469 strlcat(card->longname, ", full speed", sizeof(card->longname)); 470 break; 471 case USB_SPEED_HIGH: 472 strlcat(card->longname, ", high speed", sizeof(card->longname)); 473 break; 474 case USB_SPEED_SUPER: 475 strlcat(card->longname, ", super speed", sizeof(card->longname)); 476 break; 477 case USB_SPEED_SUPER_PLUS: 478 strlcat(card->longname, ", super speed plus", sizeof(card->longname)); 479 break; 480 default: 481 break; 482 } 483 484 snd_usb_audio_create_proc(chip); 485 486 *rchip = chip; 487 return 0; 488 } 489 490 /* look for a matching quirk alias id */ 491 static bool get_alias_id(struct usb_device *dev, unsigned int *id) 492 { 493 int i; 494 unsigned int src, dst; 495 496 for (i = 0; i < ARRAY_SIZE(quirk_alias); i++) { 497 if (!quirk_alias[i] || 498 sscanf(quirk_alias[i], "%x:%x", &src, &dst) != 2 || 499 src != *id) 500 continue; 501 dev_info(&dev->dev, 502 "device (%04x:%04x): applying quirk alias %04x:%04x\n", 503 USB_ID_VENDOR(*id), USB_ID_PRODUCT(*id), 504 USB_ID_VENDOR(dst), USB_ID_PRODUCT(dst)); 505 *id = dst; 506 return true; 507 } 508 509 return false; 510 } 511 512 static const struct usb_device_id usb_audio_ids[]; /* defined below */ 513 514 /* look for the corresponding quirk */ 515 static const struct snd_usb_audio_quirk * 516 get_alias_quirk(struct usb_device *dev, unsigned int id) 517 { 518 const struct usb_device_id *p; 519 520 for (p = usb_audio_ids; p->match_flags; p++) { 521 /* FIXME: this checks only vendor:product pair in the list */ 522 if ((p->match_flags & USB_DEVICE_ID_MATCH_DEVICE) == 523 USB_DEVICE_ID_MATCH_DEVICE && 524 p->idVendor == USB_ID_VENDOR(id) && 525 p->idProduct == USB_ID_PRODUCT(id)) 526 return (const struct snd_usb_audio_quirk *)p->driver_info; 527 } 528 529 return NULL; 530 } 531 532 /* 533 * probe the active usb device 534 * 535 * note that this can be called multiple times per a device, when it 536 * includes multiple audio control interfaces. 537 * 538 * thus we check the usb device pointer and creates the card instance 539 * only at the first time. the successive calls of this function will 540 * append the pcm interface to the corresponding card. 541 */ 542 static int usb_audio_probe(struct usb_interface *intf, 543 const struct usb_device_id *usb_id) 544 { 545 struct usb_device *dev = interface_to_usbdev(intf); 546 const struct snd_usb_audio_quirk *quirk = 547 (const struct snd_usb_audio_quirk *)usb_id->driver_info; 548 struct snd_usb_audio *chip; 549 int i, err; 550 struct usb_host_interface *alts; 551 int ifnum; 552 u32 id; 553 554 alts = &intf->altsetting[0]; 555 ifnum = get_iface_desc(alts)->bInterfaceNumber; 556 id = USB_ID(le16_to_cpu(dev->descriptor.idVendor), 557 le16_to_cpu(dev->descriptor.idProduct)); 558 if (get_alias_id(dev, &id)) 559 quirk = get_alias_quirk(dev, id); 560 if (quirk && quirk->ifnum >= 0 && ifnum != quirk->ifnum) 561 return -ENXIO; 562 563 err = snd_usb_apply_boot_quirk(dev, intf, quirk, id); 564 if (err < 0) 565 return err; 566 567 /* 568 * found a config. now register to ALSA 569 */ 570 571 /* check whether it's already registered */ 572 chip = NULL; 573 mutex_lock(®ister_mutex); 574 for (i = 0; i < SNDRV_CARDS; i++) { 575 if (usb_chip[i] && usb_chip[i]->dev == dev) { 576 if (atomic_read(&usb_chip[i]->shutdown)) { 577 dev_err(&dev->dev, "USB device is in the shutdown state, cannot create a card instance\n"); 578 err = -EIO; 579 goto __error; 580 } 581 chip = usb_chip[i]; 582 atomic_inc(&chip->active); /* avoid autopm */ 583 break; 584 } 585 } 586 if (! chip) { 587 /* it's a fresh one. 588 * now look for an empty slot and create a new card instance 589 */ 590 for (i = 0; i < SNDRV_CARDS; i++) 591 if (!usb_chip[i] && 592 (vid[i] == -1 || vid[i] == USB_ID_VENDOR(id)) && 593 (pid[i] == -1 || pid[i] == USB_ID_PRODUCT(id))) { 594 if (enable[i]) { 595 err = snd_usb_audio_create(intf, dev, i, quirk, 596 id, &chip); 597 if (err < 0) 598 goto __error; 599 chip->pm_intf = intf; 600 break; 601 } else if (vid[i] != -1 || pid[i] != -1) { 602 dev_info(&dev->dev, 603 "device (%04x:%04x) is disabled\n", 604 USB_ID_VENDOR(id), 605 USB_ID_PRODUCT(id)); 606 err = -ENOENT; 607 goto __error; 608 } 609 } 610 if (!chip) { 611 dev_err(&dev->dev, "no available usb audio device\n"); 612 err = -ENODEV; 613 goto __error; 614 } 615 } 616 dev_set_drvdata(&dev->dev, chip); 617 618 /* 619 * For devices with more than one control interface, we assume the 620 * first contains the audio controls. We might need a more specific 621 * check here in the future. 622 */ 623 if (!chip->ctrl_intf) 624 chip->ctrl_intf = alts; 625 626 chip->txfr_quirk = 0; 627 err = 1; /* continue */ 628 if (quirk && quirk->ifnum != QUIRK_NO_INTERFACE) { 629 /* need some special handlings */ 630 err = snd_usb_create_quirk(chip, intf, &usb_audio_driver, quirk); 631 if (err < 0) 632 goto __error; 633 } 634 635 if (err > 0) { 636 /* create normal USB audio interfaces */ 637 err = snd_usb_create_streams(chip, ifnum); 638 if (err < 0) 639 goto __error; 640 err = snd_usb_create_mixer(chip, ifnum, ignore_ctl_error); 641 if (err < 0) 642 goto __error; 643 } 644 645 /* we are allowed to call snd_card_register() many times */ 646 err = snd_card_register(chip->card); 647 if (err < 0) 648 goto __error; 649 650 usb_chip[chip->index] = chip; 651 chip->num_interfaces++; 652 usb_set_intfdata(intf, chip); 653 atomic_dec(&chip->active); 654 mutex_unlock(®ister_mutex); 655 return 0; 656 657 __error: 658 if (chip) { 659 if (!chip->num_interfaces) 660 snd_card_free(chip->card); 661 atomic_dec(&chip->active); 662 } 663 mutex_unlock(®ister_mutex); 664 return err; 665 } 666 667 /* 668 * we need to take care of counter, since disconnection can be called also 669 * many times as well as usb_audio_probe(). 670 */ 671 static void usb_audio_disconnect(struct usb_interface *intf) 672 { 673 struct snd_usb_audio *chip = usb_get_intfdata(intf); 674 struct snd_card *card; 675 struct list_head *p; 676 677 if (chip == (void *)-1L) 678 return; 679 680 card = chip->card; 681 682 mutex_lock(®ister_mutex); 683 if (atomic_inc_return(&chip->shutdown) == 1) { 684 struct snd_usb_stream *as; 685 struct snd_usb_endpoint *ep; 686 struct usb_mixer_interface *mixer; 687 688 /* wait until all pending tasks done; 689 * they are protected by snd_usb_lock_shutdown() 690 */ 691 wait_event(chip->shutdown_wait, 692 !atomic_read(&chip->usage_count)); 693 snd_card_disconnect(card); 694 /* release the pcm resources */ 695 list_for_each_entry(as, &chip->pcm_list, list) { 696 snd_usb_stream_disconnect(as); 697 } 698 /* release the endpoint resources */ 699 list_for_each_entry(ep, &chip->ep_list, list) { 700 snd_usb_endpoint_release(ep); 701 } 702 /* release the midi resources */ 703 list_for_each(p, &chip->midi_list) { 704 snd_usbmidi_disconnect(p); 705 } 706 /* release mixer resources */ 707 list_for_each_entry(mixer, &chip->mixer_list, list) { 708 snd_usb_mixer_disconnect(mixer); 709 } 710 } 711 712 chip->num_interfaces--; 713 if (chip->num_interfaces <= 0) { 714 usb_chip[chip->index] = NULL; 715 mutex_unlock(®ister_mutex); 716 snd_card_free_when_closed(card); 717 } else { 718 mutex_unlock(®ister_mutex); 719 } 720 } 721 722 /* lock the shutdown (disconnect) task and autoresume */ 723 int snd_usb_lock_shutdown(struct snd_usb_audio *chip) 724 { 725 int err; 726 727 atomic_inc(&chip->usage_count); 728 if (atomic_read(&chip->shutdown)) { 729 err = -EIO; 730 goto error; 731 } 732 err = snd_usb_autoresume(chip); 733 if (err < 0) 734 goto error; 735 return 0; 736 737 error: 738 if (atomic_dec_and_test(&chip->usage_count)) 739 wake_up(&chip->shutdown_wait); 740 return err; 741 } 742 743 /* autosuspend and unlock the shutdown */ 744 void snd_usb_unlock_shutdown(struct snd_usb_audio *chip) 745 { 746 snd_usb_autosuspend(chip); 747 if (atomic_dec_and_test(&chip->usage_count)) 748 wake_up(&chip->shutdown_wait); 749 } 750 751 #ifdef CONFIG_PM 752 753 int snd_usb_autoresume(struct snd_usb_audio *chip) 754 { 755 if (atomic_read(&chip->shutdown)) 756 return -EIO; 757 if (atomic_inc_return(&chip->active) == 1) 758 return usb_autopm_get_interface(chip->pm_intf); 759 return 0; 760 } 761 762 void snd_usb_autosuspend(struct snd_usb_audio *chip) 763 { 764 if (atomic_read(&chip->shutdown)) 765 return; 766 if (atomic_dec_and_test(&chip->active)) 767 usb_autopm_put_interface(chip->pm_intf); 768 } 769 770 static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message) 771 { 772 struct snd_usb_audio *chip = usb_get_intfdata(intf); 773 struct snd_usb_stream *as; 774 struct usb_mixer_interface *mixer; 775 struct list_head *p; 776 777 if (chip == (void *)-1L) 778 return 0; 779 780 chip->autosuspended = !!PMSG_IS_AUTO(message); 781 if (!chip->autosuspended) 782 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot); 783 if (!chip->num_suspended_intf++) { 784 list_for_each_entry(as, &chip->pcm_list, list) { 785 snd_pcm_suspend_all(as->pcm); 786 as->substream[0].need_setup_ep = 787 as->substream[1].need_setup_ep = true; 788 } 789 list_for_each(p, &chip->midi_list) 790 snd_usbmidi_suspend(p); 791 list_for_each_entry(mixer, &chip->mixer_list, list) 792 snd_usb_mixer_suspend(mixer); 793 } 794 795 return 0; 796 } 797 798 static int __usb_audio_resume(struct usb_interface *intf, bool reset_resume) 799 { 800 struct snd_usb_audio *chip = usb_get_intfdata(intf); 801 struct usb_mixer_interface *mixer; 802 struct list_head *p; 803 int err = 0; 804 805 if (chip == (void *)-1L) 806 return 0; 807 if (--chip->num_suspended_intf) 808 return 0; 809 810 atomic_inc(&chip->active); /* avoid autopm */ 811 /* 812 * ALSA leaves material resumption to user space 813 * we just notify and restart the mixers 814 */ 815 list_for_each_entry(mixer, &chip->mixer_list, list) { 816 err = snd_usb_mixer_resume(mixer, reset_resume); 817 if (err < 0) 818 goto err_out; 819 } 820 821 list_for_each(p, &chip->midi_list) { 822 snd_usbmidi_resume(p); 823 } 824 825 if (!chip->autosuspended) 826 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0); 827 chip->autosuspended = 0; 828 829 err_out: 830 atomic_dec(&chip->active); /* allow autopm after this point */ 831 return err; 832 } 833 834 static int usb_audio_resume(struct usb_interface *intf) 835 { 836 return __usb_audio_resume(intf, false); 837 } 838 839 static int usb_audio_reset_resume(struct usb_interface *intf) 840 { 841 return __usb_audio_resume(intf, true); 842 } 843 #else 844 #define usb_audio_suspend NULL 845 #define usb_audio_resume NULL 846 #define usb_audio_reset_resume NULL 847 #endif /* CONFIG_PM */ 848 849 static const struct usb_device_id usb_audio_ids [] = { 850 #include "quirks-table.h" 851 { .match_flags = (USB_DEVICE_ID_MATCH_INT_CLASS | USB_DEVICE_ID_MATCH_INT_SUBCLASS), 852 .bInterfaceClass = USB_CLASS_AUDIO, 853 .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL }, 854 { } /* Terminating entry */ 855 }; 856 MODULE_DEVICE_TABLE(usb, usb_audio_ids); 857 858 /* 859 * entry point for linux usb interface 860 */ 861 862 static struct usb_driver usb_audio_driver = { 863 .name = "snd-usb-audio", 864 .probe = usb_audio_probe, 865 .disconnect = usb_audio_disconnect, 866 .suspend = usb_audio_suspend, 867 .resume = usb_audio_resume, 868 .reset_resume = usb_audio_reset_resume, 869 .id_table = usb_audio_ids, 870 .supports_autosuspend = 1, 871 }; 872 873 module_usb_driver(usb_audio_driver); 874