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 70MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>"); 71MODULE_DESCRIPTION("USB Audio"); 72MODULE_LICENSE("GPL"); 73MODULE_SUPPORTED_DEVICE("{{Generic,USB Audio}}"); 74 75 76static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */ 77static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */ 78static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;/* Enable this card */ 79/* Vendor/product IDs for this card */ 80static int vid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 }; 81static int pid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 }; 82static int device_setup[SNDRV_CARDS]; /* device parameter for this card */ 83static bool ignore_ctl_error; 84static bool autoclock = true; 85 86module_param_array(index, int, NULL, 0444); 87MODULE_PARM_DESC(index, "Index value for the USB audio adapter."); 88module_param_array(id, charp, NULL, 0444); 89MODULE_PARM_DESC(id, "ID string for the USB audio adapter."); 90module_param_array(enable, bool, NULL, 0444); 91MODULE_PARM_DESC(enable, "Enable USB audio adapter."); 92module_param_array(vid, int, NULL, 0444); 93MODULE_PARM_DESC(vid, "Vendor ID for the USB audio device."); 94module_param_array(pid, int, NULL, 0444); 95MODULE_PARM_DESC(pid, "Product ID for the USB audio device."); 96module_param_array(device_setup, int, NULL, 0444); 97MODULE_PARM_DESC(device_setup, "Specific device setup (if needed)."); 98module_param(ignore_ctl_error, bool, 0444); 99MODULE_PARM_DESC(ignore_ctl_error, 100 "Ignore errors from USB controller for mixer interfaces."); 101module_param(autoclock, bool, 0444); 102MODULE_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 109static DEFINE_MUTEX(register_mutex); 110static struct snd_usb_audio *usb_chip[SNDRV_CARDS]; 111static struct usb_driver usb_audio_driver; 112 113/* 114 * disconnect streams 115 * called from usb_audio_disconnect() 116 */ 117static 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 132static 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 */ 214static 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 306static 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 318static 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 */ 327static 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_waitqueue_head(&chip->shutdown_wait); 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 atomic_set(&chip->usage_count, 0); 376 atomic_set(&chip->shutdown, 0); 377 378 chip->usb_id = USB_ID(le16_to_cpu(dev->descriptor.idVendor), 379 le16_to_cpu(dev->descriptor.idProduct)); 380 INIT_LIST_HEAD(&chip->pcm_list); 381 INIT_LIST_HEAD(&chip->ep_list); 382 INIT_LIST_HEAD(&chip->midi_list); 383 INIT_LIST_HEAD(&chip->mixer_list); 384 385 if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) { 386 snd_usb_audio_free(chip); 387 snd_card_free(card); 388 return err; 389 } 390 391 strcpy(card->driver, "USB-Audio"); 392 sprintf(component, "USB%04x:%04x", 393 USB_ID_VENDOR(chip->usb_id), USB_ID_PRODUCT(chip->usb_id)); 394 snd_component_add(card, component); 395 396 /* retrieve the device string as shortname */ 397 if (quirk && quirk->product_name && *quirk->product_name) { 398 strlcpy(card->shortname, quirk->product_name, sizeof(card->shortname)); 399 } else { 400 if (!dev->descriptor.iProduct || 401 usb_string(dev, dev->descriptor.iProduct, 402 card->shortname, sizeof(card->shortname)) <= 0) { 403 /* no name available from anywhere, so use ID */ 404 sprintf(card->shortname, "USB Device %#04x:%#04x", 405 USB_ID_VENDOR(chip->usb_id), 406 USB_ID_PRODUCT(chip->usb_id)); 407 } 408 } 409 strim(card->shortname); 410 411 /* retrieve the vendor and device strings as longname */ 412 if (quirk && quirk->vendor_name && *quirk->vendor_name) { 413 len = strlcpy(card->longname, quirk->vendor_name, sizeof(card->longname)); 414 } else { 415 if (dev->descriptor.iManufacturer) 416 len = usb_string(dev, dev->descriptor.iManufacturer, 417 card->longname, sizeof(card->longname)); 418 else 419 len = 0; 420 /* we don't really care if there isn't any vendor string */ 421 } 422 if (len > 0) { 423 strim(card->longname); 424 if (*card->longname) 425 strlcat(card->longname, " ", sizeof(card->longname)); 426 } 427 428 strlcat(card->longname, card->shortname, sizeof(card->longname)); 429 430 len = strlcat(card->longname, " at ", sizeof(card->longname)); 431 432 if (len < sizeof(card->longname)) 433 usb_make_path(dev, card->longname + len, sizeof(card->longname) - len); 434 435 switch (snd_usb_get_speed(dev)) { 436 case USB_SPEED_LOW: 437 strlcat(card->longname, ", low speed", sizeof(card->longname)); 438 break; 439 case USB_SPEED_FULL: 440 strlcat(card->longname, ", full speed", sizeof(card->longname)); 441 break; 442 case USB_SPEED_HIGH: 443 strlcat(card->longname, ", high speed", sizeof(card->longname)); 444 break; 445 case USB_SPEED_SUPER: 446 strlcat(card->longname, ", super speed", sizeof(card->longname)); 447 break; 448 default: 449 break; 450 } 451 452 snd_usb_audio_create_proc(chip); 453 454 *rchip = chip; 455 return 0; 456} 457 458/* 459 * probe the active usb device 460 * 461 * note that this can be called multiple times per a device, when it 462 * includes multiple audio control interfaces. 463 * 464 * thus we check the usb device pointer and creates the card instance 465 * only at the first time. the successive calls of this function will 466 * append the pcm interface to the corresponding card. 467 */ 468static int usb_audio_probe(struct usb_interface *intf, 469 const struct usb_device_id *usb_id) 470{ 471 struct usb_device *dev = interface_to_usbdev(intf); 472 const struct snd_usb_audio_quirk *quirk = 473 (const struct snd_usb_audio_quirk *)usb_id->driver_info; 474 struct snd_usb_audio *chip; 475 int i, err; 476 struct usb_host_interface *alts; 477 int ifnum; 478 u32 id; 479 480 alts = &intf->altsetting[0]; 481 ifnum = get_iface_desc(alts)->bInterfaceNumber; 482 id = USB_ID(le16_to_cpu(dev->descriptor.idVendor), 483 le16_to_cpu(dev->descriptor.idProduct)); 484 if (quirk && quirk->ifnum >= 0 && ifnum != quirk->ifnum) 485 return -ENXIO; 486 487 err = snd_usb_apply_boot_quirk(dev, intf, quirk); 488 if (err < 0) 489 return err; 490 491 /* 492 * found a config. now register to ALSA 493 */ 494 495 /* check whether it's already registered */ 496 chip = NULL; 497 mutex_lock(®ister_mutex); 498 for (i = 0; i < SNDRV_CARDS; i++) { 499 if (usb_chip[i] && usb_chip[i]->dev == dev) { 500 if (atomic_read(&usb_chip[i]->shutdown)) { 501 dev_err(&dev->dev, "USB device is in the shutdown state, cannot create a card instance\n"); 502 err = -EIO; 503 goto __error; 504 } 505 chip = usb_chip[i]; 506 chip->probing = 1; 507 break; 508 } 509 } 510 if (! chip) { 511 /* it's a fresh one. 512 * now look for an empty slot and create a new card instance 513 */ 514 for (i = 0; i < SNDRV_CARDS; i++) 515 if (enable[i] && ! usb_chip[i] && 516 (vid[i] == -1 || vid[i] == USB_ID_VENDOR(id)) && 517 (pid[i] == -1 || pid[i] == USB_ID_PRODUCT(id))) { 518 err = snd_usb_audio_create(intf, dev, i, quirk, 519 &chip); 520 if (err < 0) 521 goto __error; 522 chip->pm_intf = intf; 523 break; 524 } 525 if (!chip) { 526 dev_err(&dev->dev, "no available usb audio device\n"); 527 err = -ENODEV; 528 goto __error; 529 } 530 } 531 532 /* 533 * For devices with more than one control interface, we assume the 534 * first contains the audio controls. We might need a more specific 535 * check here in the future. 536 */ 537 if (!chip->ctrl_intf) 538 chip->ctrl_intf = alts; 539 540 chip->txfr_quirk = 0; 541 err = 1; /* continue */ 542 if (quirk && quirk->ifnum != QUIRK_NO_INTERFACE) { 543 /* need some special handlings */ 544 err = snd_usb_create_quirk(chip, intf, &usb_audio_driver, quirk); 545 if (err < 0) 546 goto __error; 547 } 548 549 if (err > 0) { 550 /* create normal USB audio interfaces */ 551 err = snd_usb_create_streams(chip, ifnum); 552 if (err < 0) 553 goto __error; 554 err = snd_usb_create_mixer(chip, ifnum, ignore_ctl_error); 555 if (err < 0) 556 goto __error; 557 } 558 559 /* we are allowed to call snd_card_register() many times */ 560 err = snd_card_register(chip->card); 561 if (err < 0) 562 goto __error; 563 564 usb_chip[chip->index] = chip; 565 chip->num_interfaces++; 566 chip->probing = 0; 567 usb_set_intfdata(intf, chip); 568 mutex_unlock(®ister_mutex); 569 return 0; 570 571 __error: 572 if (chip) { 573 if (!chip->num_interfaces) 574 snd_card_free(chip->card); 575 chip->probing = 0; 576 } 577 mutex_unlock(®ister_mutex); 578 return err; 579} 580 581/* 582 * we need to take care of counter, since disconnection can be called also 583 * many times as well as usb_audio_probe(). 584 */ 585static void usb_audio_disconnect(struct usb_interface *intf) 586{ 587 struct snd_usb_audio *chip = usb_get_intfdata(intf); 588 struct snd_card *card; 589 struct list_head *p; 590 591 if (chip == (void *)-1L) 592 return; 593 594 card = chip->card; 595 596 mutex_lock(®ister_mutex); 597 if (atomic_inc_return(&chip->shutdown) == 1) { 598 struct snd_usb_stream *as; 599 struct snd_usb_endpoint *ep; 600 struct usb_mixer_interface *mixer; 601 602 /* wait until all pending tasks done; 603 * they are protected by snd_usb_lock_shutdown() 604 */ 605 wait_event(chip->shutdown_wait, 606 !atomic_read(&chip->usage_count)); 607 snd_card_disconnect(card); 608 /* release the pcm resources */ 609 list_for_each_entry(as, &chip->pcm_list, list) { 610 snd_usb_stream_disconnect(as); 611 } 612 /* release the endpoint resources */ 613 list_for_each_entry(ep, &chip->ep_list, list) { 614 snd_usb_endpoint_release(ep); 615 } 616 /* release the midi resources */ 617 list_for_each(p, &chip->midi_list) { 618 snd_usbmidi_disconnect(p); 619 } 620 /* release mixer resources */ 621 list_for_each_entry(mixer, &chip->mixer_list, list) { 622 snd_usb_mixer_disconnect(mixer); 623 } 624 } 625 626 chip->num_interfaces--; 627 if (chip->num_interfaces <= 0) { 628 usb_chip[chip->index] = NULL; 629 mutex_unlock(®ister_mutex); 630 snd_card_free_when_closed(card); 631 } else { 632 mutex_unlock(®ister_mutex); 633 } 634} 635 636/* lock the shutdown (disconnect) task and autoresume */ 637int snd_usb_lock_shutdown(struct snd_usb_audio *chip) 638{ 639 int err; 640 641 atomic_inc(&chip->usage_count); 642 if (atomic_read(&chip->shutdown)) { 643 err = -EIO; 644 goto error; 645 } 646 err = snd_usb_autoresume(chip); 647 if (err < 0) 648 goto error; 649 return 0; 650 651 error: 652 if (atomic_dec_and_test(&chip->usage_count)) 653 wake_up(&chip->shutdown_wait); 654 return err; 655} 656 657/* autosuspend and unlock the shutdown */ 658void snd_usb_unlock_shutdown(struct snd_usb_audio *chip) 659{ 660 snd_usb_autosuspend(chip); 661 if (atomic_dec_and_test(&chip->usage_count)) 662 wake_up(&chip->shutdown_wait); 663} 664 665#ifdef CONFIG_PM 666 667int snd_usb_autoresume(struct snd_usb_audio *chip) 668{ 669 if (atomic_read(&chip->shutdown)) 670 return -EIO; 671 if (chip->probing) 672 return 0; 673 if (atomic_inc_return(&chip->active) == 1) 674 return usb_autopm_get_interface(chip->pm_intf); 675 return 0; 676} 677 678void snd_usb_autosuspend(struct snd_usb_audio *chip) 679{ 680 if (chip->probing) 681 return; 682 if (atomic_read(&chip->shutdown)) 683 return; 684 if (atomic_dec_and_test(&chip->active)) 685 usb_autopm_put_interface(chip->pm_intf); 686} 687 688static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message) 689{ 690 struct snd_usb_audio *chip = usb_get_intfdata(intf); 691 struct snd_usb_stream *as; 692 struct usb_mixer_interface *mixer; 693 struct list_head *p; 694 695 if (chip == (void *)-1L) 696 return 0; 697 698 if (!PMSG_IS_AUTO(message)) { 699 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot); 700 if (!chip->num_suspended_intf++) { 701 list_for_each_entry(as, &chip->pcm_list, list) { 702 snd_pcm_suspend_all(as->pcm); 703 as->substream[0].need_setup_ep = 704 as->substream[1].need_setup_ep = true; 705 } 706 list_for_each(p, &chip->midi_list) { 707 snd_usbmidi_suspend(p); 708 } 709 } 710 } else { 711 /* 712 * otherwise we keep the rest of the system in the dark 713 * to keep this transparent 714 */ 715 if (!chip->num_suspended_intf++) 716 chip->autosuspended = 1; 717 } 718 719 if (chip->num_suspended_intf == 1) 720 list_for_each_entry(mixer, &chip->mixer_list, list) 721 snd_usb_mixer_suspend(mixer); 722 723 return 0; 724} 725 726static int __usb_audio_resume(struct usb_interface *intf, bool reset_resume) 727{ 728 struct snd_usb_audio *chip = usb_get_intfdata(intf); 729 struct usb_mixer_interface *mixer; 730 struct list_head *p; 731 int err = 0; 732 733 if (chip == (void *)-1L) 734 return 0; 735 if (--chip->num_suspended_intf) 736 return 0; 737 738 atomic_inc(&chip->active); /* avoid autopm */ 739 /* 740 * ALSA leaves material resumption to user space 741 * we just notify and restart the mixers 742 */ 743 list_for_each_entry(mixer, &chip->mixer_list, list) { 744 err = snd_usb_mixer_resume(mixer, reset_resume); 745 if (err < 0) 746 goto err_out; 747 } 748 749 list_for_each(p, &chip->midi_list) { 750 snd_usbmidi_resume(p); 751 } 752 753 if (!chip->autosuspended) 754 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0); 755 chip->autosuspended = 0; 756 757err_out: 758 atomic_dec(&chip->active); /* allow autopm after this point */ 759 return err; 760} 761 762static int usb_audio_resume(struct usb_interface *intf) 763{ 764 return __usb_audio_resume(intf, false); 765} 766 767static int usb_audio_reset_resume(struct usb_interface *intf) 768{ 769 return __usb_audio_resume(intf, true); 770} 771#else 772#define usb_audio_suspend NULL 773#define usb_audio_resume NULL 774#define usb_audio_reset_resume NULL 775#endif /* CONFIG_PM */ 776 777static struct usb_device_id usb_audio_ids [] = { 778#include "quirks-table.h" 779 { .match_flags = (USB_DEVICE_ID_MATCH_INT_CLASS | USB_DEVICE_ID_MATCH_INT_SUBCLASS), 780 .bInterfaceClass = USB_CLASS_AUDIO, 781 .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL }, 782 { } /* Terminating entry */ 783}; 784MODULE_DEVICE_TABLE(usb, usb_audio_ids); 785 786/* 787 * entry point for linux usb interface 788 */ 789 790static struct usb_driver usb_audio_driver = { 791 .name = "snd-usb-audio", 792 .probe = usb_audio_probe, 793 .disconnect = usb_audio_disconnect, 794 .suspend = usb_audio_suspend, 795 .resume = usb_audio_resume, 796 .reset_resume = usb_audio_reset_resume, 797 .id_table = usb_audio_ids, 798 .supports_autosuspend = 1, 799}; 800 801module_usb_driver(usb_audio_driver); 802