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 snd_usb_audio_disconnect() 116 */ 117 static void snd_usb_stream_disconnect(struct list_head *head) 118 { 119 int idx; 120 struct snd_usb_stream *as; 121 struct snd_usb_substream *subs; 122 123 as = list_entry(head, struct snd_usb_stream, list); 124 for (idx = 0; idx < 2; idx++) { 125 subs = &as->substream[idx]; 126 if (!subs->num_formats) 127 continue; 128 subs->interface = -1; 129 subs->data_endpoint = NULL; 130 subs->sync_endpoint = NULL; 131 } 132 } 133 134 static int snd_usb_create_stream(struct snd_usb_audio *chip, int ctrlif, int interface) 135 { 136 struct usb_device *dev = chip->dev; 137 struct usb_host_interface *alts; 138 struct usb_interface_descriptor *altsd; 139 struct usb_interface *iface = usb_ifnum_to_if(dev, interface); 140 141 if (!iface) { 142 dev_err(&dev->dev, "%u:%d : does not exist\n", 143 ctrlif, interface); 144 return -EINVAL; 145 } 146 147 alts = &iface->altsetting[0]; 148 altsd = get_iface_desc(alts); 149 150 /* 151 * Android with both accessory and audio interfaces enabled gets the 152 * interface numbers wrong. 153 */ 154 if ((chip->usb_id == USB_ID(0x18d1, 0x2d04) || 155 chip->usb_id == USB_ID(0x18d1, 0x2d05)) && 156 interface == 0 && 157 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC && 158 altsd->bInterfaceSubClass == USB_SUBCLASS_VENDOR_SPEC) { 159 interface = 2; 160 iface = usb_ifnum_to_if(dev, interface); 161 if (!iface) 162 return -EINVAL; 163 alts = &iface->altsetting[0]; 164 altsd = get_iface_desc(alts); 165 } 166 167 if (usb_interface_claimed(iface)) { 168 dev_dbg(&dev->dev, "%d:%d: skipping, already claimed\n", 169 ctrlif, interface); 170 return -EINVAL; 171 } 172 173 if ((altsd->bInterfaceClass == USB_CLASS_AUDIO || 174 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC) && 175 altsd->bInterfaceSubClass == USB_SUBCLASS_MIDISTREAMING) { 176 int err = snd_usbmidi_create(chip->card, iface, 177 &chip->midi_list, NULL); 178 if (err < 0) { 179 dev_err(&dev->dev, 180 "%u:%d: cannot create sequencer device\n", 181 ctrlif, interface); 182 return -EINVAL; 183 } 184 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L); 185 186 return 0; 187 } 188 189 if ((altsd->bInterfaceClass != USB_CLASS_AUDIO && 190 altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) || 191 altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING) { 192 dev_dbg(&dev->dev, 193 "%u:%d: skipping non-supported interface %d\n", 194 ctrlif, interface, altsd->bInterfaceClass); 195 /* skip non-supported classes */ 196 return -EINVAL; 197 } 198 199 if (snd_usb_get_speed(dev) == USB_SPEED_LOW) { 200 dev_err(&dev->dev, "low speed audio streaming not supported\n"); 201 return -EINVAL; 202 } 203 204 if (! snd_usb_parse_audio_interface(chip, interface)) { 205 usb_set_interface(dev, interface, 0); /* reset the current interface */ 206 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L); 207 return -EINVAL; 208 } 209 210 return 0; 211 } 212 213 /* 214 * parse audio control descriptor and create pcm/midi streams 215 */ 216 static int snd_usb_create_streams(struct snd_usb_audio *chip, int ctrlif) 217 { 218 struct usb_device *dev = chip->dev; 219 struct usb_host_interface *host_iface; 220 struct usb_interface_descriptor *altsd; 221 void *control_header; 222 int i, protocol; 223 224 /* find audiocontrol interface */ 225 host_iface = &usb_ifnum_to_if(dev, ctrlif)->altsetting[0]; 226 control_header = snd_usb_find_csint_desc(host_iface->extra, 227 host_iface->extralen, 228 NULL, UAC_HEADER); 229 altsd = get_iface_desc(host_iface); 230 protocol = altsd->bInterfaceProtocol; 231 232 if (!control_header) { 233 dev_err(&dev->dev, "cannot find UAC_HEADER\n"); 234 return -EINVAL; 235 } 236 237 switch (protocol) { 238 default: 239 dev_warn(&dev->dev, 240 "unknown interface protocol %#02x, assuming v1\n", 241 protocol); 242 /* fall through */ 243 244 case UAC_VERSION_1: { 245 struct uac1_ac_header_descriptor *h1 = control_header; 246 247 if (!h1->bInCollection) { 248 dev_info(&dev->dev, "skipping empty audio interface (v1)\n"); 249 return -EINVAL; 250 } 251 252 if (h1->bLength < sizeof(*h1) + h1->bInCollection) { 253 dev_err(&dev->dev, "invalid UAC_HEADER (v1)\n"); 254 return -EINVAL; 255 } 256 257 for (i = 0; i < h1->bInCollection; i++) 258 snd_usb_create_stream(chip, ctrlif, h1->baInterfaceNr[i]); 259 260 break; 261 } 262 263 case UAC_VERSION_2: { 264 struct usb_interface_assoc_descriptor *assoc = 265 usb_ifnum_to_if(dev, ctrlif)->intf_assoc; 266 267 if (!assoc) { 268 /* 269 * Firmware writers cannot count to three. So to find 270 * the IAD on the NuForce UDH-100, also check the next 271 * interface. 272 */ 273 struct usb_interface *iface = 274 usb_ifnum_to_if(dev, ctrlif + 1); 275 if (iface && 276 iface->intf_assoc && 277 iface->intf_assoc->bFunctionClass == USB_CLASS_AUDIO && 278 iface->intf_assoc->bFunctionProtocol == UAC_VERSION_2) 279 assoc = iface->intf_assoc; 280 } 281 282 if (!assoc) { 283 dev_err(&dev->dev, "Audio class v2 interfaces need an interface association\n"); 284 return -EINVAL; 285 } 286 287 for (i = 0; i < assoc->bInterfaceCount; i++) { 288 int intf = assoc->bFirstInterface + i; 289 290 if (intf != ctrlif) 291 snd_usb_create_stream(chip, ctrlif, intf); 292 } 293 294 break; 295 } 296 } 297 298 return 0; 299 } 300 301 /* 302 * free the chip instance 303 * 304 * here we have to do not much, since pcm and controls are already freed 305 * 306 */ 307 308 static int snd_usb_audio_free(struct snd_usb_audio *chip) 309 { 310 struct list_head *p, *n; 311 312 list_for_each_safe(p, n, &chip->ep_list) 313 snd_usb_endpoint_free(p); 314 315 mutex_destroy(&chip->mutex); 316 kfree(chip); 317 return 0; 318 } 319 320 static int snd_usb_audio_dev_free(struct snd_device *device) 321 { 322 struct snd_usb_audio *chip = device->device_data; 323 return snd_usb_audio_free(chip); 324 } 325 326 static void remove_trailing_spaces(char *str) 327 { 328 char *p; 329 330 if (!*str) 331 return; 332 for (p = str + strlen(str) - 1; p >= str && isspace(*p); p--) 333 *p = 0; 334 } 335 336 /* 337 * create a chip instance and set its names. 338 */ 339 static int snd_usb_audio_create(struct usb_interface *intf, 340 struct usb_device *dev, int idx, 341 const struct snd_usb_audio_quirk *quirk, 342 struct snd_usb_audio **rchip) 343 { 344 struct snd_card *card; 345 struct snd_usb_audio *chip; 346 int err, len; 347 char component[14]; 348 static struct snd_device_ops ops = { 349 .dev_free = snd_usb_audio_dev_free, 350 }; 351 352 *rchip = NULL; 353 354 switch (snd_usb_get_speed(dev)) { 355 case USB_SPEED_LOW: 356 case USB_SPEED_FULL: 357 case USB_SPEED_HIGH: 358 case USB_SPEED_WIRELESS: 359 case USB_SPEED_SUPER: 360 break; 361 default: 362 dev_err(&dev->dev, "unknown device speed %d\n", snd_usb_get_speed(dev)); 363 return -ENXIO; 364 } 365 366 err = snd_card_new(&intf->dev, index[idx], id[idx], THIS_MODULE, 367 0, &card); 368 if (err < 0) { 369 dev_err(&dev->dev, "cannot create card instance %d\n", idx); 370 return err; 371 } 372 373 chip = kzalloc(sizeof(*chip), GFP_KERNEL); 374 if (! chip) { 375 snd_card_free(card); 376 return -ENOMEM; 377 } 378 379 mutex_init(&chip->mutex); 380 init_rwsem(&chip->shutdown_rwsem); 381 chip->index = idx; 382 chip->dev = dev; 383 chip->card = card; 384 chip->setup = device_setup[idx]; 385 chip->autoclock = autoclock; 386 chip->probing = 1; 387 388 chip->usb_id = USB_ID(le16_to_cpu(dev->descriptor.idVendor), 389 le16_to_cpu(dev->descriptor.idProduct)); 390 INIT_LIST_HEAD(&chip->pcm_list); 391 INIT_LIST_HEAD(&chip->ep_list); 392 INIT_LIST_HEAD(&chip->midi_list); 393 INIT_LIST_HEAD(&chip->mixer_list); 394 395 if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) { 396 snd_usb_audio_free(chip); 397 snd_card_free(card); 398 return err; 399 } 400 401 strcpy(card->driver, "USB-Audio"); 402 sprintf(component, "USB%04x:%04x", 403 USB_ID_VENDOR(chip->usb_id), USB_ID_PRODUCT(chip->usb_id)); 404 snd_component_add(card, component); 405 406 /* retrieve the device string as shortname */ 407 if (quirk && quirk->product_name && *quirk->product_name) { 408 strlcpy(card->shortname, quirk->product_name, sizeof(card->shortname)); 409 } else { 410 if (!dev->descriptor.iProduct || 411 usb_string(dev, dev->descriptor.iProduct, 412 card->shortname, sizeof(card->shortname)) <= 0) { 413 /* no name available from anywhere, so use ID */ 414 sprintf(card->shortname, "USB Device %#04x:%#04x", 415 USB_ID_VENDOR(chip->usb_id), 416 USB_ID_PRODUCT(chip->usb_id)); 417 } 418 } 419 remove_trailing_spaces(card->shortname); 420 421 /* retrieve the vendor and device strings as longname */ 422 if (quirk && quirk->vendor_name && *quirk->vendor_name) { 423 len = strlcpy(card->longname, quirk->vendor_name, sizeof(card->longname)); 424 } else { 425 if (dev->descriptor.iManufacturer) 426 len = usb_string(dev, dev->descriptor.iManufacturer, 427 card->longname, sizeof(card->longname)); 428 else 429 len = 0; 430 /* we don't really care if there isn't any vendor string */ 431 } 432 if (len > 0) { 433 remove_trailing_spaces(card->longname); 434 if (*card->longname) 435 strlcat(card->longname, " ", sizeof(card->longname)); 436 } 437 438 strlcat(card->longname, card->shortname, sizeof(card->longname)); 439 440 len = strlcat(card->longname, " at ", sizeof(card->longname)); 441 442 if (len < sizeof(card->longname)) 443 usb_make_path(dev, card->longname + len, sizeof(card->longname) - len); 444 445 switch (snd_usb_get_speed(dev)) { 446 case USB_SPEED_LOW: 447 strlcat(card->longname, ", low speed", sizeof(card->longname)); 448 break; 449 case USB_SPEED_FULL: 450 strlcat(card->longname, ", full speed", sizeof(card->longname)); 451 break; 452 case USB_SPEED_HIGH: 453 strlcat(card->longname, ", high speed", sizeof(card->longname)); 454 break; 455 case USB_SPEED_SUPER: 456 strlcat(card->longname, ", super speed", sizeof(card->longname)); 457 break; 458 default: 459 break; 460 } 461 462 snd_usb_audio_create_proc(chip); 463 464 *rchip = chip; 465 return 0; 466 } 467 468 /* 469 * probe the active usb device 470 * 471 * note that this can be called multiple times per a device, when it 472 * includes multiple audio control interfaces. 473 * 474 * thus we check the usb device pointer and creates the card instance 475 * only at the first time. the successive calls of this function will 476 * append the pcm interface to the corresponding card. 477 */ 478 static struct snd_usb_audio * 479 snd_usb_audio_probe(struct usb_device *dev, 480 struct usb_interface *intf, 481 const struct usb_device_id *usb_id) 482 { 483 const struct snd_usb_audio_quirk *quirk = (const struct snd_usb_audio_quirk *)usb_id->driver_info; 484 int i, err; 485 struct snd_usb_audio *chip; 486 struct usb_host_interface *alts; 487 int ifnum; 488 u32 id; 489 490 alts = &intf->altsetting[0]; 491 ifnum = get_iface_desc(alts)->bInterfaceNumber; 492 id = USB_ID(le16_to_cpu(dev->descriptor.idVendor), 493 le16_to_cpu(dev->descriptor.idProduct)); 494 if (quirk && quirk->ifnum >= 0 && ifnum != quirk->ifnum) 495 goto __err_val; 496 497 if (snd_usb_apply_boot_quirk(dev, intf, quirk) < 0) 498 goto __err_val; 499 500 /* 501 * found a config. now register to ALSA 502 */ 503 504 /* check whether it's already registered */ 505 chip = NULL; 506 mutex_lock(®ister_mutex); 507 for (i = 0; i < SNDRV_CARDS; i++) { 508 if (usb_chip[i] && usb_chip[i]->dev == dev) { 509 if (usb_chip[i]->shutdown) { 510 dev_err(&dev->dev, "USB device is in the shutdown state, cannot create a card instance\n"); 511 goto __error; 512 } 513 chip = usb_chip[i]; 514 chip->probing = 1; 515 break; 516 } 517 } 518 if (! chip) { 519 /* it's a fresh one. 520 * now look for an empty slot and create a new card instance 521 */ 522 for (i = 0; i < SNDRV_CARDS; i++) 523 if (enable[i] && ! usb_chip[i] && 524 (vid[i] == -1 || vid[i] == USB_ID_VENDOR(id)) && 525 (pid[i] == -1 || pid[i] == USB_ID_PRODUCT(id))) { 526 if (snd_usb_audio_create(intf, dev, i, quirk, 527 &chip) < 0) { 528 goto __error; 529 } 530 chip->pm_intf = intf; 531 break; 532 } 533 if (!chip) { 534 dev_err(&dev->dev, "no available usb audio device\n"); 535 goto __error; 536 } 537 } 538 539 /* 540 * For devices with more than one control interface, we assume the 541 * first contains the audio controls. We might need a more specific 542 * check here in the future. 543 */ 544 if (!chip->ctrl_intf) 545 chip->ctrl_intf = alts; 546 547 chip->txfr_quirk = 0; 548 err = 1; /* continue */ 549 if (quirk && quirk->ifnum != QUIRK_NO_INTERFACE) { 550 /* need some special handlings */ 551 if ((err = snd_usb_create_quirk(chip, intf, &usb_audio_driver, quirk)) < 0) 552 goto __error; 553 } 554 555 if (err > 0) { 556 /* create normal USB audio interfaces */ 557 if (snd_usb_create_streams(chip, ifnum) < 0 || 558 snd_usb_create_mixer(chip, ifnum, ignore_ctl_error) < 0) { 559 goto __error; 560 } 561 } 562 563 /* we are allowed to call snd_card_register() many times */ 564 if (snd_card_register(chip->card) < 0) { 565 goto __error; 566 } 567 568 usb_chip[chip->index] = chip; 569 chip->num_interfaces++; 570 chip->probing = 0; 571 mutex_unlock(®ister_mutex); 572 return chip; 573 574 __error: 575 if (chip) { 576 if (!chip->num_interfaces) 577 snd_card_free(chip->card); 578 chip->probing = 0; 579 } 580 mutex_unlock(®ister_mutex); 581 __err_val: 582 return NULL; 583 } 584 585 /* 586 * we need to take care of counter, since disconnection can be called also 587 * many times as well as usb_audio_probe(). 588 */ 589 static void snd_usb_audio_disconnect(struct usb_device *dev, 590 struct snd_usb_audio *chip) 591 { 592 struct snd_card *card; 593 struct list_head *p; 594 595 if (chip == (void *)-1L) 596 return; 597 598 card = chip->card; 599 down_write(&chip->shutdown_rwsem); 600 chip->shutdown = 1; 601 up_write(&chip->shutdown_rwsem); 602 603 mutex_lock(®ister_mutex); 604 chip->num_interfaces--; 605 if (chip->num_interfaces <= 0) { 606 struct snd_usb_endpoint *ep; 607 608 snd_card_disconnect(card); 609 /* release the pcm resources */ 610 list_for_each(p, &chip->pcm_list) { 611 snd_usb_stream_disconnect(p); 612 } 613 /* release the endpoint resources */ 614 list_for_each_entry(ep, &chip->ep_list, list) { 615 snd_usb_endpoint_release(ep); 616 } 617 /* release the midi resources */ 618 list_for_each(p, &chip->midi_list) { 619 snd_usbmidi_disconnect(p); 620 } 621 /* release mixer resources */ 622 list_for_each(p, &chip->mixer_list) { 623 snd_usb_mixer_disconnect(p); 624 } 625 usb_chip[chip->index] = NULL; 626 mutex_unlock(®ister_mutex); 627 snd_card_free_when_closed(card); 628 } else { 629 mutex_unlock(®ister_mutex); 630 } 631 } 632 633 /* 634 * new 2.5 USB kernel API 635 */ 636 static int usb_audio_probe(struct usb_interface *intf, 637 const struct usb_device_id *id) 638 { 639 struct snd_usb_audio *chip; 640 chip = snd_usb_audio_probe(interface_to_usbdev(intf), intf, id); 641 if (chip) { 642 usb_set_intfdata(intf, chip); 643 return 0; 644 } else 645 return -EIO; 646 } 647 648 static void usb_audio_disconnect(struct usb_interface *intf) 649 { 650 snd_usb_audio_disconnect(interface_to_usbdev(intf), 651 usb_get_intfdata(intf)); 652 } 653 654 #ifdef CONFIG_PM 655 656 int snd_usb_autoresume(struct snd_usb_audio *chip) 657 { 658 int err = -ENODEV; 659 660 down_read(&chip->shutdown_rwsem); 661 if (chip->probing && chip->in_pm) 662 err = 0; 663 else if (!chip->shutdown) 664 err = usb_autopm_get_interface(chip->pm_intf); 665 up_read(&chip->shutdown_rwsem); 666 667 return err; 668 } 669 670 void snd_usb_autosuspend(struct snd_usb_audio *chip) 671 { 672 down_read(&chip->shutdown_rwsem); 673 if (!chip->shutdown && !chip->probing && !chip->in_pm) 674 usb_autopm_put_interface(chip->pm_intf); 675 up_read(&chip->shutdown_rwsem); 676 } 677 678 static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message) 679 { 680 struct snd_usb_audio *chip = usb_get_intfdata(intf); 681 struct snd_usb_stream *as; 682 struct usb_mixer_interface *mixer; 683 684 if (chip == (void *)-1L) 685 return 0; 686 687 if (!PMSG_IS_AUTO(message)) { 688 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot); 689 if (!chip->num_suspended_intf++) { 690 list_for_each_entry(as, &chip->pcm_list, list) { 691 snd_pcm_suspend_all(as->pcm); 692 as->substream[0].need_setup_ep = 693 as->substream[1].need_setup_ep = true; 694 } 695 } 696 } else { 697 /* 698 * otherwise we keep the rest of the system in the dark 699 * to keep this transparent 700 */ 701 if (!chip->num_suspended_intf++) 702 chip->autosuspended = 1; 703 } 704 705 if (chip->num_suspended_intf == 1) 706 list_for_each_entry(mixer, &chip->mixer_list, list) 707 snd_usb_mixer_suspend(mixer); 708 709 return 0; 710 } 711 712 static int __usb_audio_resume(struct usb_interface *intf, bool reset_resume) 713 { 714 struct snd_usb_audio *chip = usb_get_intfdata(intf); 715 struct usb_mixer_interface *mixer; 716 int err = 0; 717 718 if (chip == (void *)-1L) 719 return 0; 720 if (--chip->num_suspended_intf) 721 return 0; 722 723 chip->in_pm = 1; 724 /* 725 * ALSA leaves material resumption to user space 726 * we just notify and restart the mixers 727 */ 728 list_for_each_entry(mixer, &chip->mixer_list, list) { 729 err = snd_usb_mixer_resume(mixer, reset_resume); 730 if (err < 0) 731 goto err_out; 732 } 733 734 if (!chip->autosuspended) 735 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0); 736 chip->autosuspended = 0; 737 738 err_out: 739 chip->in_pm = 0; 740 return err; 741 } 742 743 static int usb_audio_resume(struct usb_interface *intf) 744 { 745 return __usb_audio_resume(intf, false); 746 } 747 748 static int usb_audio_reset_resume(struct usb_interface *intf) 749 { 750 return __usb_audio_resume(intf, true); 751 } 752 #else 753 #define usb_audio_suspend NULL 754 #define usb_audio_resume NULL 755 #define usb_audio_reset_resume NULL 756 #endif /* CONFIG_PM */ 757 758 static struct usb_device_id usb_audio_ids [] = { 759 #include "quirks-table.h" 760 { .match_flags = (USB_DEVICE_ID_MATCH_INT_CLASS | USB_DEVICE_ID_MATCH_INT_SUBCLASS), 761 .bInterfaceClass = USB_CLASS_AUDIO, 762 .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL }, 763 { } /* Terminating entry */ 764 }; 765 MODULE_DEVICE_TABLE(usb, usb_audio_ids); 766 767 /* 768 * entry point for linux usb interface 769 */ 770 771 static struct usb_driver usb_audio_driver = { 772 .name = "snd-usb-audio", 773 .probe = usb_audio_probe, 774 .disconnect = usb_audio_disconnect, 775 .suspend = usb_audio_suspend, 776 .resume = usb_audio_resume, 777 .reset_resume = usb_audio_reset_resume, 778 .id_table = usb_audio_ids, 779 .supports_autosuspend = 1, 780 }; 781 782 module_usb_driver(usb_audio_driver); 783