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 86 module_param_array(index, int, NULL, 0444); 87 MODULE_PARM_DESC(index, "Index value for the USB audio adapter."); 88 module_param_array(id, charp, NULL, 0444); 89 MODULE_PARM_DESC(id, "ID string for the USB audio adapter."); 90 module_param_array(enable, bool, NULL, 0444); 91 MODULE_PARM_DESC(enable, "Enable USB audio adapter."); 92 module_param_array(vid, int, NULL, 0444); 93 MODULE_PARM_DESC(vid, "Vendor ID for the USB audio device."); 94 module_param_array(pid, int, NULL, 0444); 95 MODULE_PARM_DESC(pid, "Product ID for the USB audio device."); 96 module_param_array(device_setup, int, NULL, 0444); 97 MODULE_PARM_DESC(device_setup, "Specific device setup (if needed)."); 98 module_param(ignore_ctl_error, bool, 0444); 99 MODULE_PARM_DESC(ignore_ctl_error, 100 "Ignore errors from USB controller for mixer interfaces."); 101 module_param(autoclock, bool, 0444); 102 MODULE_PARM_DESC(autoclock, "Enable auto-clock selection for UAC2 devices (default: yes)."); 103 104 /* 105 * we keep the snd_usb_audio_t instances by ourselves for merging 106 * the all interfaces on the same card as one sound device. 107 */ 108 109 static DEFINE_MUTEX(register_mutex); 110 static struct snd_usb_audio *usb_chip[SNDRV_CARDS]; 111 static struct usb_driver usb_audio_driver; 112 113 /* 114 * disconnect streams 115 * called from usb_audio_disconnect() 116 */ 117 static void snd_usb_stream_disconnect(struct snd_usb_stream *as) 118 { 119 int idx; 120 struct snd_usb_substream *subs; 121 122 for (idx = 0; idx < 2; idx++) { 123 subs = &as->substream[idx]; 124 if (!subs->num_formats) 125 continue; 126 subs->interface = -1; 127 subs->data_endpoint = NULL; 128 subs->sync_endpoint = NULL; 129 } 130 } 131 132 static int snd_usb_create_stream(struct snd_usb_audio *chip, int ctrlif, int interface) 133 { 134 struct usb_device *dev = chip->dev; 135 struct usb_host_interface *alts; 136 struct usb_interface_descriptor *altsd; 137 struct usb_interface *iface = usb_ifnum_to_if(dev, interface); 138 139 if (!iface) { 140 dev_err(&dev->dev, "%u:%d : does not exist\n", 141 ctrlif, interface); 142 return -EINVAL; 143 } 144 145 alts = &iface->altsetting[0]; 146 altsd = get_iface_desc(alts); 147 148 /* 149 * Android with both accessory and audio interfaces enabled gets the 150 * interface numbers wrong. 151 */ 152 if ((chip->usb_id == USB_ID(0x18d1, 0x2d04) || 153 chip->usb_id == USB_ID(0x18d1, 0x2d05)) && 154 interface == 0 && 155 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC && 156 altsd->bInterfaceSubClass == USB_SUBCLASS_VENDOR_SPEC) { 157 interface = 2; 158 iface = usb_ifnum_to_if(dev, interface); 159 if (!iface) 160 return -EINVAL; 161 alts = &iface->altsetting[0]; 162 altsd = get_iface_desc(alts); 163 } 164 165 if (usb_interface_claimed(iface)) { 166 dev_dbg(&dev->dev, "%d:%d: skipping, already claimed\n", 167 ctrlif, interface); 168 return -EINVAL; 169 } 170 171 if ((altsd->bInterfaceClass == USB_CLASS_AUDIO || 172 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC) && 173 altsd->bInterfaceSubClass == USB_SUBCLASS_MIDISTREAMING) { 174 int err = snd_usbmidi_create(chip->card, iface, 175 &chip->midi_list, NULL); 176 if (err < 0) { 177 dev_err(&dev->dev, 178 "%u:%d: cannot create sequencer device\n", 179 ctrlif, interface); 180 return -EINVAL; 181 } 182 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L); 183 184 return 0; 185 } 186 187 if ((altsd->bInterfaceClass != USB_CLASS_AUDIO && 188 altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) || 189 altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING) { 190 dev_dbg(&dev->dev, 191 "%u:%d: skipping non-supported interface %d\n", 192 ctrlif, interface, altsd->bInterfaceClass); 193 /* skip non-supported classes */ 194 return -EINVAL; 195 } 196 197 if (snd_usb_get_speed(dev) == USB_SPEED_LOW) { 198 dev_err(&dev->dev, "low speed audio streaming not supported\n"); 199 return -EINVAL; 200 } 201 202 if (! snd_usb_parse_audio_interface(chip, interface)) { 203 usb_set_interface(dev, interface, 0); /* reset the current interface */ 204 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L); 205 return -EINVAL; 206 } 207 208 return 0; 209 } 210 211 /* 212 * parse audio control descriptor and create pcm/midi streams 213 */ 214 static int snd_usb_create_streams(struct snd_usb_audio *chip, int ctrlif) 215 { 216 struct usb_device *dev = chip->dev; 217 struct usb_host_interface *host_iface; 218 struct usb_interface_descriptor *altsd; 219 void *control_header; 220 int i, protocol; 221 222 /* find audiocontrol interface */ 223 host_iface = &usb_ifnum_to_if(dev, ctrlif)->altsetting[0]; 224 control_header = snd_usb_find_csint_desc(host_iface->extra, 225 host_iface->extralen, 226 NULL, UAC_HEADER); 227 altsd = get_iface_desc(host_iface); 228 protocol = altsd->bInterfaceProtocol; 229 230 if (!control_header) { 231 dev_err(&dev->dev, "cannot find UAC_HEADER\n"); 232 return -EINVAL; 233 } 234 235 switch (protocol) { 236 default: 237 dev_warn(&dev->dev, 238 "unknown interface protocol %#02x, assuming v1\n", 239 protocol); 240 /* fall through */ 241 242 case UAC_VERSION_1: { 243 struct uac1_ac_header_descriptor *h1 = control_header; 244 245 if (!h1->bInCollection) { 246 dev_info(&dev->dev, "skipping empty audio interface (v1)\n"); 247 return -EINVAL; 248 } 249 250 if (h1->bLength < sizeof(*h1) + h1->bInCollection) { 251 dev_err(&dev->dev, "invalid UAC_HEADER (v1)\n"); 252 return -EINVAL; 253 } 254 255 for (i = 0; i < h1->bInCollection; i++) 256 snd_usb_create_stream(chip, ctrlif, h1->baInterfaceNr[i]); 257 258 break; 259 } 260 261 case UAC_VERSION_2: { 262 struct usb_interface_assoc_descriptor *assoc = 263 usb_ifnum_to_if(dev, ctrlif)->intf_assoc; 264 265 if (!assoc) { 266 /* 267 * Firmware writers cannot count to three. So to find 268 * the IAD on the NuForce UDH-100, also check the next 269 * interface. 270 */ 271 struct usb_interface *iface = 272 usb_ifnum_to_if(dev, ctrlif + 1); 273 if (iface && 274 iface->intf_assoc && 275 iface->intf_assoc->bFunctionClass == USB_CLASS_AUDIO && 276 iface->intf_assoc->bFunctionProtocol == UAC_VERSION_2) 277 assoc = iface->intf_assoc; 278 } 279 280 if (!assoc) { 281 dev_err(&dev->dev, "Audio class v2 interfaces need an interface association\n"); 282 return -EINVAL; 283 } 284 285 for (i = 0; i < assoc->bInterfaceCount; i++) { 286 int intf = assoc->bFirstInterface + i; 287 288 if (intf != ctrlif) 289 snd_usb_create_stream(chip, ctrlif, intf); 290 } 291 292 break; 293 } 294 } 295 296 return 0; 297 } 298 299 /* 300 * free the chip instance 301 * 302 * here we have to do not much, since pcm and controls are already freed 303 * 304 */ 305 306 static int snd_usb_audio_free(struct snd_usb_audio *chip) 307 { 308 struct snd_usb_endpoint *ep, *n; 309 310 list_for_each_entry_safe(ep, n, &chip->ep_list, list) 311 snd_usb_endpoint_free(ep); 312 313 mutex_destroy(&chip->mutex); 314 kfree(chip); 315 return 0; 316 } 317 318 static int snd_usb_audio_dev_free(struct snd_device *device) 319 { 320 struct snd_usb_audio *chip = device->device_data; 321 return snd_usb_audio_free(chip); 322 } 323 324 /* 325 * create a chip instance and set its names. 326 */ 327 static int snd_usb_audio_create(struct usb_interface *intf, 328 struct usb_device *dev, int idx, 329 const struct snd_usb_audio_quirk *quirk, 330 struct snd_usb_audio **rchip) 331 { 332 struct snd_card *card; 333 struct snd_usb_audio *chip; 334 int err, len; 335 char component[14]; 336 static struct snd_device_ops ops = { 337 .dev_free = snd_usb_audio_dev_free, 338 }; 339 340 *rchip = NULL; 341 342 switch (snd_usb_get_speed(dev)) { 343 case USB_SPEED_LOW: 344 case USB_SPEED_FULL: 345 case USB_SPEED_HIGH: 346 case USB_SPEED_WIRELESS: 347 case USB_SPEED_SUPER: 348 break; 349 default: 350 dev_err(&dev->dev, "unknown device speed %d\n", snd_usb_get_speed(dev)); 351 return -ENXIO; 352 } 353 354 err = snd_card_new(&intf->dev, index[idx], id[idx], THIS_MODULE, 355 0, &card); 356 if (err < 0) { 357 dev_err(&dev->dev, "cannot create card instance %d\n", idx); 358 return err; 359 } 360 361 chip = kzalloc(sizeof(*chip), GFP_KERNEL); 362 if (! chip) { 363 snd_card_free(card); 364 return -ENOMEM; 365 } 366 367 mutex_init(&chip->mutex); 368 init_rwsem(&chip->shutdown_rwsem); 369 chip->index = idx; 370 chip->dev = dev; 371 chip->card = card; 372 chip->setup = device_setup[idx]; 373 chip->autoclock = autoclock; 374 chip->probing = 1; 375 376 chip->usb_id = USB_ID(le16_to_cpu(dev->descriptor.idVendor), 377 le16_to_cpu(dev->descriptor.idProduct)); 378 INIT_LIST_HEAD(&chip->pcm_list); 379 INIT_LIST_HEAD(&chip->ep_list); 380 INIT_LIST_HEAD(&chip->midi_list); 381 INIT_LIST_HEAD(&chip->mixer_list); 382 383 if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) { 384 snd_usb_audio_free(chip); 385 snd_card_free(card); 386 return err; 387 } 388 389 strcpy(card->driver, "USB-Audio"); 390 sprintf(component, "USB%04x:%04x", 391 USB_ID_VENDOR(chip->usb_id), USB_ID_PRODUCT(chip->usb_id)); 392 snd_component_add(card, component); 393 394 /* retrieve the device string as shortname */ 395 if (quirk && quirk->product_name && *quirk->product_name) { 396 strlcpy(card->shortname, quirk->product_name, sizeof(card->shortname)); 397 } else { 398 if (!dev->descriptor.iProduct || 399 usb_string(dev, dev->descriptor.iProduct, 400 card->shortname, sizeof(card->shortname)) <= 0) { 401 /* no name available from anywhere, so use ID */ 402 sprintf(card->shortname, "USB Device %#04x:%#04x", 403 USB_ID_VENDOR(chip->usb_id), 404 USB_ID_PRODUCT(chip->usb_id)); 405 } 406 } 407 strim(card->shortname); 408 409 /* retrieve the vendor and device strings as longname */ 410 if (quirk && quirk->vendor_name && *quirk->vendor_name) { 411 len = strlcpy(card->longname, quirk->vendor_name, sizeof(card->longname)); 412 } else { 413 if (dev->descriptor.iManufacturer) 414 len = usb_string(dev, dev->descriptor.iManufacturer, 415 card->longname, sizeof(card->longname)); 416 else 417 len = 0; 418 /* we don't really care if there isn't any vendor string */ 419 } 420 if (len > 0) { 421 strim(card->longname); 422 if (*card->longname) 423 strlcat(card->longname, " ", sizeof(card->longname)); 424 } 425 426 strlcat(card->longname, card->shortname, sizeof(card->longname)); 427 428 len = strlcat(card->longname, " at ", sizeof(card->longname)); 429 430 if (len < sizeof(card->longname)) 431 usb_make_path(dev, card->longname + len, sizeof(card->longname) - len); 432 433 switch (snd_usb_get_speed(dev)) { 434 case USB_SPEED_LOW: 435 strlcat(card->longname, ", low speed", sizeof(card->longname)); 436 break; 437 case USB_SPEED_FULL: 438 strlcat(card->longname, ", full speed", sizeof(card->longname)); 439 break; 440 case USB_SPEED_HIGH: 441 strlcat(card->longname, ", high speed", sizeof(card->longname)); 442 break; 443 case USB_SPEED_SUPER: 444 strlcat(card->longname, ", super speed", sizeof(card->longname)); 445 break; 446 default: 447 break; 448 } 449 450 snd_usb_audio_create_proc(chip); 451 452 *rchip = chip; 453 return 0; 454 } 455 456 /* 457 * probe the active usb device 458 * 459 * note that this can be called multiple times per a device, when it 460 * includes multiple audio control interfaces. 461 * 462 * thus we check the usb device pointer and creates the card instance 463 * only at the first time. the successive calls of this function will 464 * append the pcm interface to the corresponding card. 465 */ 466 static int usb_audio_probe(struct usb_interface *intf, 467 const struct usb_device_id *usb_id) 468 { 469 struct usb_device *dev = interface_to_usbdev(intf); 470 const struct snd_usb_audio_quirk *quirk = 471 (const struct snd_usb_audio_quirk *)usb_id->driver_info; 472 struct snd_usb_audio *chip; 473 int i, err; 474 struct usb_host_interface *alts; 475 int ifnum; 476 u32 id; 477 478 alts = &intf->altsetting[0]; 479 ifnum = get_iface_desc(alts)->bInterfaceNumber; 480 id = USB_ID(le16_to_cpu(dev->descriptor.idVendor), 481 le16_to_cpu(dev->descriptor.idProduct)); 482 if (quirk && quirk->ifnum >= 0 && ifnum != quirk->ifnum) 483 return -ENXIO; 484 485 err = snd_usb_apply_boot_quirk(dev, intf, quirk); 486 if (err < 0) 487 return err; 488 489 /* 490 * found a config. now register to ALSA 491 */ 492 493 /* check whether it's already registered */ 494 chip = NULL; 495 mutex_lock(®ister_mutex); 496 for (i = 0; i < SNDRV_CARDS; i++) { 497 if (usb_chip[i] && usb_chip[i]->dev == dev) { 498 if (usb_chip[i]->shutdown) { 499 dev_err(&dev->dev, "USB device is in the shutdown state, cannot create a card instance\n"); 500 err = -EIO; 501 goto __error; 502 } 503 chip = usb_chip[i]; 504 chip->probing = 1; 505 break; 506 } 507 } 508 if (! chip) { 509 /* it's a fresh one. 510 * now look for an empty slot and create a new card instance 511 */ 512 for (i = 0; i < SNDRV_CARDS; i++) 513 if (enable[i] && ! usb_chip[i] && 514 (vid[i] == -1 || vid[i] == USB_ID_VENDOR(id)) && 515 (pid[i] == -1 || pid[i] == USB_ID_PRODUCT(id))) { 516 err = snd_usb_audio_create(intf, dev, i, quirk, 517 &chip); 518 if (err < 0) 519 goto __error; 520 chip->pm_intf = intf; 521 break; 522 } 523 if (!chip) { 524 dev_err(&dev->dev, "no available usb audio device\n"); 525 err = -ENODEV; 526 goto __error; 527 } 528 } 529 530 /* 531 * For devices with more than one control interface, we assume the 532 * first contains the audio controls. We might need a more specific 533 * check here in the future. 534 */ 535 if (!chip->ctrl_intf) 536 chip->ctrl_intf = alts; 537 538 chip->txfr_quirk = 0; 539 err = 1; /* continue */ 540 if (quirk && quirk->ifnum != QUIRK_NO_INTERFACE) { 541 /* need some special handlings */ 542 err = snd_usb_create_quirk(chip, intf, &usb_audio_driver, quirk); 543 if (err < 0) 544 goto __error; 545 } 546 547 if (err > 0) { 548 /* create normal USB audio interfaces */ 549 err = snd_usb_create_streams(chip, ifnum); 550 if (err < 0) 551 goto __error; 552 err = snd_usb_create_mixer(chip, ifnum, ignore_ctl_error); 553 if (err < 0) 554 goto __error; 555 } 556 557 /* we are allowed to call snd_card_register() many times */ 558 err = snd_card_register(chip->card); 559 if (err < 0) 560 goto __error; 561 562 usb_chip[chip->index] = chip; 563 chip->num_interfaces++; 564 chip->probing = 0; 565 usb_set_intfdata(intf, chip); 566 mutex_unlock(®ister_mutex); 567 return 0; 568 569 __error: 570 if (chip) { 571 if (!chip->num_interfaces) 572 snd_card_free(chip->card); 573 chip->probing = 0; 574 } 575 mutex_unlock(®ister_mutex); 576 return err; 577 } 578 579 /* 580 * we need to take care of counter, since disconnection can be called also 581 * many times as well as usb_audio_probe(). 582 */ 583 static void usb_audio_disconnect(struct usb_interface *intf) 584 { 585 struct snd_usb_audio *chip = usb_get_intfdata(intf); 586 struct snd_card *card; 587 struct list_head *p; 588 bool was_shutdown; 589 590 if (chip == (void *)-1L) 591 return; 592 593 card = chip->card; 594 down_write(&chip->shutdown_rwsem); 595 was_shutdown = chip->shutdown; 596 chip->shutdown = 1; 597 up_write(&chip->shutdown_rwsem); 598 599 mutex_lock(®ister_mutex); 600 if (!was_shutdown) { 601 struct snd_usb_stream *as; 602 struct snd_usb_endpoint *ep; 603 struct usb_mixer_interface *mixer; 604 605 snd_card_disconnect(card); 606 /* release the pcm resources */ 607 list_for_each_entry(as, &chip->pcm_list, list) { 608 snd_usb_stream_disconnect(as); 609 } 610 /* release the endpoint resources */ 611 list_for_each_entry(ep, &chip->ep_list, list) { 612 snd_usb_endpoint_release(ep); 613 } 614 /* release the midi resources */ 615 list_for_each(p, &chip->midi_list) { 616 snd_usbmidi_disconnect(p); 617 } 618 /* release mixer resources */ 619 list_for_each_entry(mixer, &chip->mixer_list, list) { 620 snd_usb_mixer_disconnect(mixer); 621 } 622 } 623 624 chip->num_interfaces--; 625 if (chip->num_interfaces <= 0) { 626 usb_chip[chip->index] = NULL; 627 mutex_unlock(®ister_mutex); 628 snd_card_free_when_closed(card); 629 } else { 630 mutex_unlock(®ister_mutex); 631 } 632 } 633 634 #ifdef CONFIG_PM 635 636 int snd_usb_autoresume(struct snd_usb_audio *chip) 637 { 638 int err = -ENODEV; 639 640 down_read(&chip->shutdown_rwsem); 641 if (chip->probing && chip->in_pm) 642 err = 0; 643 else if (!chip->shutdown) 644 err = usb_autopm_get_interface(chip->pm_intf); 645 up_read(&chip->shutdown_rwsem); 646 647 return err; 648 } 649 650 void snd_usb_autosuspend(struct snd_usb_audio *chip) 651 { 652 down_read(&chip->shutdown_rwsem); 653 if (!chip->shutdown && !chip->probing && !chip->in_pm) 654 usb_autopm_put_interface(chip->pm_intf); 655 up_read(&chip->shutdown_rwsem); 656 } 657 658 static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message) 659 { 660 struct snd_usb_audio *chip = usb_get_intfdata(intf); 661 struct snd_usb_stream *as; 662 struct usb_mixer_interface *mixer; 663 struct list_head *p; 664 665 if (chip == (void *)-1L) 666 return 0; 667 668 if (!PMSG_IS_AUTO(message)) { 669 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot); 670 if (!chip->num_suspended_intf++) { 671 list_for_each_entry(as, &chip->pcm_list, list) { 672 snd_pcm_suspend_all(as->pcm); 673 as->substream[0].need_setup_ep = 674 as->substream[1].need_setup_ep = true; 675 } 676 list_for_each(p, &chip->midi_list) { 677 snd_usbmidi_suspend(p); 678 } 679 } 680 } else { 681 /* 682 * otherwise we keep the rest of the system in the dark 683 * to keep this transparent 684 */ 685 if (!chip->num_suspended_intf++) 686 chip->autosuspended = 1; 687 } 688 689 if (chip->num_suspended_intf == 1) 690 list_for_each_entry(mixer, &chip->mixer_list, list) 691 snd_usb_mixer_suspend(mixer); 692 693 return 0; 694 } 695 696 static int __usb_audio_resume(struct usb_interface *intf, bool reset_resume) 697 { 698 struct snd_usb_audio *chip = usb_get_intfdata(intf); 699 struct usb_mixer_interface *mixer; 700 struct list_head *p; 701 int err = 0; 702 703 if (chip == (void *)-1L) 704 return 0; 705 if (--chip->num_suspended_intf) 706 return 0; 707 708 chip->in_pm = 1; 709 /* 710 * ALSA leaves material resumption to user space 711 * we just notify and restart the mixers 712 */ 713 list_for_each_entry(mixer, &chip->mixer_list, list) { 714 err = snd_usb_mixer_resume(mixer, reset_resume); 715 if (err < 0) 716 goto err_out; 717 } 718 719 list_for_each(p, &chip->midi_list) { 720 snd_usbmidi_resume(p); 721 } 722 723 if (!chip->autosuspended) 724 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0); 725 chip->autosuspended = 0; 726 727 err_out: 728 chip->in_pm = 0; 729 return err; 730 } 731 732 static int usb_audio_resume(struct usb_interface *intf) 733 { 734 return __usb_audio_resume(intf, false); 735 } 736 737 static int usb_audio_reset_resume(struct usb_interface *intf) 738 { 739 return __usb_audio_resume(intf, true); 740 } 741 #else 742 #define usb_audio_suspend NULL 743 #define usb_audio_resume NULL 744 #define usb_audio_reset_resume NULL 745 #endif /* CONFIG_PM */ 746 747 static struct usb_device_id usb_audio_ids [] = { 748 #include "quirks-table.h" 749 { .match_flags = (USB_DEVICE_ID_MATCH_INT_CLASS | USB_DEVICE_ID_MATCH_INT_SUBCLASS), 750 .bInterfaceClass = USB_CLASS_AUDIO, 751 .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL }, 752 { } /* Terminating entry */ 753 }; 754 MODULE_DEVICE_TABLE(usb, usb_audio_ids); 755 756 /* 757 * entry point for linux usb interface 758 */ 759 760 static struct usb_driver usb_audio_driver = { 761 .name = "snd-usb-audio", 762 .probe = usb_audio_probe, 763 .disconnect = usb_audio_disconnect, 764 .suspend = usb_audio_suspend, 765 .resume = usb_audio_resume, 766 .reset_resume = usb_audio_reset_resume, 767 .id_table = usb_audio_ids, 768 .supports_autosuspend = 1, 769 }; 770 771 module_usb_driver(usb_audio_driver); 772