1 /* 2 * (Tentative) USB Audio Driver for ALSA 3 * 4 * Copyright (c) 2002 by Takashi Iwai <tiwai@suse.de> 5 * 6 * Many codes borrowed from audio.c by 7 * Alan Cox (alan@lxorguk.ukuu.org.uk) 8 * Thomas Sailer (sailer@ife.ee.ethz.ch) 9 * 10 * 11 * This program is free software; you can redistribute it and/or modify 12 * it under the terms of the GNU General Public License as published by 13 * the Free Software Foundation; either version 2 of the License, or 14 * (at your option) any later version. 15 * 16 * This program is distributed in the hope that it will be useful, 17 * but WITHOUT ANY WARRANTY; without even the implied warranty of 18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 19 * GNU General Public License for more details. 20 * 21 * You should have received a copy of the GNU General Public License 22 * along with this program; if not, write to the Free Software 23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 24 * 25 * 26 * NOTES: 27 * 28 * - the linked URBs would be preferred but not used so far because of 29 * the instability of unlinking. 30 * - type II is not supported properly. there is no device which supports 31 * this type *correctly*. SB extigy looks as if it supports, but it's 32 * indeed an AC3 stream packed in SPDIF frames (i.e. no real AC3 stream). 33 */ 34 35 36 #include <linux/bitops.h> 37 #include <linux/init.h> 38 #include <linux/list.h> 39 #include <linux/slab.h> 40 #include <linux/string.h> 41 #include <linux/ctype.h> 42 #include <linux/usb.h> 43 #include <linux/moduleparam.h> 44 #include <linux/mutex.h> 45 #include <linux/usb/audio.h> 46 #include <linux/usb/audio-v2.h> 47 #include <linux/module.h> 48 49 #include <sound/control.h> 50 #include <sound/core.h> 51 #include <sound/info.h> 52 #include <sound/pcm.h> 53 #include <sound/pcm_params.h> 54 #include <sound/initval.h> 55 56 #include "usbaudio.h" 57 #include "card.h" 58 #include "midi.h" 59 #include "mixer.h" 60 #include "proc.h" 61 #include "quirks.h" 62 #include "endpoint.h" 63 #include "helper.h" 64 #include "debug.h" 65 #include "pcm.h" 66 #include "format.h" 67 #include "power.h" 68 #include "stream.h" 69 #include "media.h" 70 71 MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>"); 72 MODULE_DESCRIPTION("USB Audio"); 73 MODULE_LICENSE("GPL"); 74 MODULE_SUPPORTED_DEVICE("{{Generic,USB Audio}}"); 75 76 77 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */ 78 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */ 79 static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;/* Enable this card */ 80 /* Vendor/product IDs for this card */ 81 static int vid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 }; 82 static int pid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 }; 83 static int device_setup[SNDRV_CARDS]; /* device parameter for this card */ 84 static bool ignore_ctl_error; 85 static bool autoclock = true; 86 87 module_param_array(index, int, NULL, 0444); 88 MODULE_PARM_DESC(index, "Index value for the USB audio adapter."); 89 module_param_array(id, charp, NULL, 0444); 90 MODULE_PARM_DESC(id, "ID string for the USB audio adapter."); 91 module_param_array(enable, bool, NULL, 0444); 92 MODULE_PARM_DESC(enable, "Enable USB audio adapter."); 93 module_param_array(vid, int, NULL, 0444); 94 MODULE_PARM_DESC(vid, "Vendor ID for the USB audio device."); 95 module_param_array(pid, int, NULL, 0444); 96 MODULE_PARM_DESC(pid, "Product ID for the USB audio device."); 97 module_param_array(device_setup, int, NULL, 0444); 98 MODULE_PARM_DESC(device_setup, "Specific device setup (if needed)."); 99 module_param(ignore_ctl_error, bool, 0444); 100 MODULE_PARM_DESC(ignore_ctl_error, 101 "Ignore errors from USB controller for mixer interfaces."); 102 module_param(autoclock, bool, 0444); 103 MODULE_PARM_DESC(autoclock, "Enable auto-clock selection for UAC2 devices (default: yes)."); 104 105 /* 106 * we keep the snd_usb_audio_t instances by ourselves for merging 107 * the all interfaces on the same card as one sound device. 108 */ 109 110 static DEFINE_MUTEX(register_mutex); 111 static struct snd_usb_audio *usb_chip[SNDRV_CARDS]; 112 static struct usb_driver usb_audio_driver; 113 114 /* 115 * disconnect streams 116 * called from usb_audio_disconnect() 117 */ 118 static void snd_usb_stream_disconnect(struct snd_usb_stream *as) 119 { 120 int idx; 121 struct snd_usb_substream *subs; 122 123 for (idx = 0; idx < 2; idx++) { 124 subs = &as->substream[idx]; 125 if (!subs->num_formats) 126 continue; 127 subs->interface = -1; 128 subs->data_endpoint = NULL; 129 subs->sync_endpoint = NULL; 130 } 131 } 132 133 static int snd_usb_create_stream(struct snd_usb_audio *chip, int ctrlif, int interface) 134 { 135 struct usb_device *dev = chip->dev; 136 struct usb_host_interface *alts; 137 struct usb_interface_descriptor *altsd; 138 struct usb_interface *iface = usb_ifnum_to_if(dev, interface); 139 140 if (!iface) { 141 dev_err(&dev->dev, "%u:%d : does not exist\n", 142 ctrlif, interface); 143 return -EINVAL; 144 } 145 146 alts = &iface->altsetting[0]; 147 altsd = get_iface_desc(alts); 148 149 /* 150 * Android with both accessory and audio interfaces enabled gets the 151 * interface numbers wrong. 152 */ 153 if ((chip->usb_id == USB_ID(0x18d1, 0x2d04) || 154 chip->usb_id == USB_ID(0x18d1, 0x2d05)) && 155 interface == 0 && 156 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC && 157 altsd->bInterfaceSubClass == USB_SUBCLASS_VENDOR_SPEC) { 158 interface = 2; 159 iface = usb_ifnum_to_if(dev, interface); 160 if (!iface) 161 return -EINVAL; 162 alts = &iface->altsetting[0]; 163 altsd = get_iface_desc(alts); 164 } 165 166 if (usb_interface_claimed(iface)) { 167 dev_dbg(&dev->dev, "%d:%d: skipping, already claimed\n", 168 ctrlif, interface); 169 return -EINVAL; 170 } 171 172 if ((altsd->bInterfaceClass == USB_CLASS_AUDIO || 173 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC) && 174 altsd->bInterfaceSubClass == USB_SUBCLASS_MIDISTREAMING) { 175 int err = snd_usbmidi_create(chip->card, iface, 176 &chip->midi_list, NULL); 177 if (err < 0) { 178 dev_err(&dev->dev, 179 "%u:%d: cannot create sequencer device\n", 180 ctrlif, interface); 181 return -EINVAL; 182 } 183 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L); 184 185 return 0; 186 } 187 188 if ((altsd->bInterfaceClass != USB_CLASS_AUDIO && 189 altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) || 190 altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING) { 191 dev_dbg(&dev->dev, 192 "%u:%d: skipping non-supported interface %d\n", 193 ctrlif, interface, altsd->bInterfaceClass); 194 /* skip non-supported classes */ 195 return -EINVAL; 196 } 197 198 if (snd_usb_get_speed(dev) == USB_SPEED_LOW) { 199 dev_err(&dev->dev, "low speed audio streaming not supported\n"); 200 return -EINVAL; 201 } 202 203 if (! snd_usb_parse_audio_interface(chip, interface)) { 204 usb_set_interface(dev, interface, 0); /* reset the current interface */ 205 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L); 206 return -EINVAL; 207 } 208 209 return 0; 210 } 211 212 /* 213 * parse audio control descriptor and create pcm/midi streams 214 */ 215 static int snd_usb_create_streams(struct snd_usb_audio *chip, int ctrlif) 216 { 217 struct usb_device *dev = chip->dev; 218 struct usb_host_interface *host_iface; 219 struct usb_interface_descriptor *altsd; 220 void *control_header; 221 int i, protocol; 222 223 /* find audiocontrol interface */ 224 host_iface = &usb_ifnum_to_if(dev, ctrlif)->altsetting[0]; 225 control_header = snd_usb_find_csint_desc(host_iface->extra, 226 host_iface->extralen, 227 NULL, UAC_HEADER); 228 altsd = get_iface_desc(host_iface); 229 protocol = altsd->bInterfaceProtocol; 230 231 if (!control_header) { 232 dev_err(&dev->dev, "cannot find UAC_HEADER\n"); 233 return -EINVAL; 234 } 235 236 switch (protocol) { 237 default: 238 dev_warn(&dev->dev, 239 "unknown interface protocol %#02x, assuming v1\n", 240 protocol); 241 /* fall through */ 242 243 case UAC_VERSION_1: { 244 struct uac1_ac_header_descriptor *h1 = control_header; 245 246 if (!h1->bInCollection) { 247 dev_info(&dev->dev, "skipping empty audio interface (v1)\n"); 248 return -EINVAL; 249 } 250 251 if (h1->bLength < sizeof(*h1) + h1->bInCollection) { 252 dev_err(&dev->dev, "invalid UAC_HEADER (v1)\n"); 253 return -EINVAL; 254 } 255 256 for (i = 0; i < h1->bInCollection; i++) 257 snd_usb_create_stream(chip, ctrlif, h1->baInterfaceNr[i]); 258 259 break; 260 } 261 262 case UAC_VERSION_2: { 263 struct usb_interface_assoc_descriptor *assoc = 264 usb_ifnum_to_if(dev, ctrlif)->intf_assoc; 265 266 if (!assoc) { 267 /* 268 * Firmware writers cannot count to three. So to find 269 * the IAD on the NuForce UDH-100, also check the next 270 * interface. 271 */ 272 struct usb_interface *iface = 273 usb_ifnum_to_if(dev, ctrlif + 1); 274 if (iface && 275 iface->intf_assoc && 276 iface->intf_assoc->bFunctionClass == USB_CLASS_AUDIO && 277 iface->intf_assoc->bFunctionProtocol == UAC_VERSION_2) 278 assoc = iface->intf_assoc; 279 } 280 281 if (!assoc) { 282 dev_err(&dev->dev, "Audio class v2 interfaces need an interface association\n"); 283 return -EINVAL; 284 } 285 286 for (i = 0; i < assoc->bInterfaceCount; i++) { 287 int intf = assoc->bFirstInterface + i; 288 289 if (intf != ctrlif) 290 snd_usb_create_stream(chip, ctrlif, intf); 291 } 292 293 break; 294 } 295 } 296 297 return 0; 298 } 299 300 /* 301 * free the chip instance 302 * 303 * here we have to do not much, since pcm and controls are already freed 304 * 305 */ 306 307 static int snd_usb_audio_free(struct snd_usb_audio *chip) 308 { 309 struct snd_usb_endpoint *ep, *n; 310 311 list_for_each_entry_safe(ep, n, &chip->ep_list, list) 312 snd_usb_endpoint_free(ep); 313 314 mutex_destroy(&chip->mutex); 315 kfree(chip); 316 return 0; 317 } 318 319 static int snd_usb_audio_dev_free(struct snd_device *device) 320 { 321 struct snd_usb_audio *chip = device->device_data; 322 return snd_usb_audio_free(chip); 323 } 324 325 /* 326 * create a chip instance and set its names. 327 */ 328 static int snd_usb_audio_create(struct usb_interface *intf, 329 struct usb_device *dev, int idx, 330 const struct snd_usb_audio_quirk *quirk, 331 struct snd_usb_audio **rchip) 332 { 333 struct snd_card *card; 334 struct snd_usb_audio *chip; 335 int err, len; 336 char component[14]; 337 static struct snd_device_ops ops = { 338 .dev_free = snd_usb_audio_dev_free, 339 }; 340 341 *rchip = NULL; 342 343 switch (snd_usb_get_speed(dev)) { 344 case USB_SPEED_LOW: 345 case USB_SPEED_FULL: 346 case USB_SPEED_HIGH: 347 case USB_SPEED_WIRELESS: 348 case USB_SPEED_SUPER: 349 break; 350 default: 351 dev_err(&dev->dev, "unknown device speed %d\n", snd_usb_get_speed(dev)); 352 return -ENXIO; 353 } 354 355 err = snd_card_new(&intf->dev, index[idx], id[idx], THIS_MODULE, 356 0, &card); 357 if (err < 0) { 358 dev_err(&dev->dev, "cannot create card instance %d\n", idx); 359 return err; 360 } 361 362 chip = kzalloc(sizeof(*chip), GFP_KERNEL); 363 if (! chip) { 364 snd_card_free(card); 365 return -ENOMEM; 366 } 367 368 mutex_init(&chip->mutex); 369 init_waitqueue_head(&chip->shutdown_wait); 370 chip->index = idx; 371 chip->dev = dev; 372 chip->card = card; 373 chip->setup = device_setup[idx]; 374 chip->autoclock = autoclock; 375 atomic_set(&chip->active, 1); /* avoid autopm during probing */ 376 atomic_set(&chip->usage_count, 0); 377 atomic_set(&chip->shutdown, 0); 378 379 chip->usb_id = USB_ID(le16_to_cpu(dev->descriptor.idVendor), 380 le16_to_cpu(dev->descriptor.idProduct)); 381 INIT_LIST_HEAD(&chip->pcm_list); 382 INIT_LIST_HEAD(&chip->ep_list); 383 INIT_LIST_HEAD(&chip->midi_list); 384 INIT_LIST_HEAD(&chip->mixer_list); 385 386 if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) { 387 snd_usb_audio_free(chip); 388 snd_card_free(card); 389 return err; 390 } 391 392 strcpy(card->driver, "USB-Audio"); 393 sprintf(component, "USB%04x:%04x", 394 USB_ID_VENDOR(chip->usb_id), USB_ID_PRODUCT(chip->usb_id)); 395 snd_component_add(card, component); 396 397 /* retrieve the device string as shortname */ 398 if (quirk && quirk->product_name && *quirk->product_name) { 399 strlcpy(card->shortname, quirk->product_name, sizeof(card->shortname)); 400 } else { 401 if (!dev->descriptor.iProduct || 402 usb_string(dev, dev->descriptor.iProduct, 403 card->shortname, sizeof(card->shortname)) <= 0) { 404 /* no name available from anywhere, so use ID */ 405 sprintf(card->shortname, "USB Device %#04x:%#04x", 406 USB_ID_VENDOR(chip->usb_id), 407 USB_ID_PRODUCT(chip->usb_id)); 408 } 409 } 410 strim(card->shortname); 411 412 /* retrieve the vendor and device strings as longname */ 413 if (quirk && quirk->vendor_name && *quirk->vendor_name) { 414 len = strlcpy(card->longname, quirk->vendor_name, sizeof(card->longname)); 415 } else { 416 if (dev->descriptor.iManufacturer) 417 len = usb_string(dev, dev->descriptor.iManufacturer, 418 card->longname, sizeof(card->longname)); 419 else 420 len = 0; 421 /* we don't really care if there isn't any vendor string */ 422 } 423 if (len > 0) { 424 strim(card->longname); 425 if (*card->longname) 426 strlcat(card->longname, " ", sizeof(card->longname)); 427 } 428 429 strlcat(card->longname, card->shortname, sizeof(card->longname)); 430 431 len = strlcat(card->longname, " at ", sizeof(card->longname)); 432 433 if (len < sizeof(card->longname)) 434 usb_make_path(dev, card->longname + len, sizeof(card->longname) - len); 435 436 switch (snd_usb_get_speed(dev)) { 437 case USB_SPEED_LOW: 438 strlcat(card->longname, ", low speed", sizeof(card->longname)); 439 break; 440 case USB_SPEED_FULL: 441 strlcat(card->longname, ", full speed", sizeof(card->longname)); 442 break; 443 case USB_SPEED_HIGH: 444 strlcat(card->longname, ", high speed", sizeof(card->longname)); 445 break; 446 case USB_SPEED_SUPER: 447 strlcat(card->longname, ", super speed", sizeof(card->longname)); 448 break; 449 default: 450 break; 451 } 452 453 snd_usb_audio_create_proc(chip); 454 455 *rchip = chip; 456 return 0; 457 } 458 459 /* 460 * probe the active usb device 461 * 462 * note that this can be called multiple times per a device, when it 463 * includes multiple audio control interfaces. 464 * 465 * thus we check the usb device pointer and creates the card instance 466 * only at the first time. the successive calls of this function will 467 * append the pcm interface to the corresponding card. 468 */ 469 static int usb_audio_probe(struct usb_interface *intf, 470 const struct usb_device_id *usb_id) 471 { 472 struct usb_device *dev = interface_to_usbdev(intf); 473 const struct snd_usb_audio_quirk *quirk = 474 (const struct snd_usb_audio_quirk *)usb_id->driver_info; 475 struct snd_usb_audio *chip; 476 int i, err; 477 struct usb_host_interface *alts; 478 int ifnum; 479 u32 id; 480 481 alts = &intf->altsetting[0]; 482 ifnum = get_iface_desc(alts)->bInterfaceNumber; 483 id = USB_ID(le16_to_cpu(dev->descriptor.idVendor), 484 le16_to_cpu(dev->descriptor.idProduct)); 485 if (quirk && quirk->ifnum >= 0 && ifnum != quirk->ifnum) 486 return -ENXIO; 487 488 err = snd_usb_apply_boot_quirk(dev, intf, quirk); 489 if (err < 0) 490 return err; 491 492 /* 493 * found a config. now register to ALSA 494 */ 495 496 /* check whether it's already registered */ 497 chip = NULL; 498 mutex_lock(®ister_mutex); 499 for (i = 0; i < SNDRV_CARDS; i++) { 500 if (usb_chip[i] && usb_chip[i]->dev == dev) { 501 if (atomic_read(&usb_chip[i]->shutdown)) { 502 dev_err(&dev->dev, "USB device is in the shutdown state, cannot create a card instance\n"); 503 err = -EIO; 504 goto __error; 505 } 506 chip = usb_chip[i]; 507 atomic_inc(&chip->active); /* avoid autopm */ 508 break; 509 } 510 } 511 if (! chip) { 512 /* it's a fresh one. 513 * now look for an empty slot and create a new card instance 514 */ 515 for (i = 0; i < SNDRV_CARDS; i++) 516 if (enable[i] && ! usb_chip[i] && 517 (vid[i] == -1 || vid[i] == USB_ID_VENDOR(id)) && 518 (pid[i] == -1 || pid[i] == USB_ID_PRODUCT(id))) { 519 err = snd_usb_audio_create(intf, dev, i, quirk, 520 &chip); 521 if (err < 0) 522 goto __error; 523 chip->pm_intf = intf; 524 break; 525 } 526 if (!chip) { 527 dev_err(&dev->dev, "no available usb audio device\n"); 528 err = -ENODEV; 529 goto __error; 530 } 531 } 532 533 /* 534 * For devices with more than one control interface, we assume the 535 * first contains the audio controls. We might need a more specific 536 * check here in the future. 537 */ 538 if (!chip->ctrl_intf) 539 chip->ctrl_intf = alts; 540 541 chip->txfr_quirk = 0; 542 err = 1; /* continue */ 543 if (quirk && quirk->ifnum != QUIRK_NO_INTERFACE) { 544 /* need some special handlings */ 545 err = snd_usb_create_quirk(chip, intf, &usb_audio_driver, quirk); 546 if (err < 0) 547 goto __error; 548 } 549 550 if (err > 0) { 551 /* create normal USB audio interfaces */ 552 err = snd_usb_create_streams(chip, ifnum); 553 if (err < 0) 554 goto __error; 555 err = snd_usb_create_mixer(chip, ifnum, ignore_ctl_error); 556 if (err < 0) 557 goto __error; 558 } 559 560 /* we are allowed to call snd_card_register() many times */ 561 err = snd_card_register(chip->card); 562 if (err < 0) 563 goto __error; 564 565 if (quirk->media_device) { 566 /* don't want to fail when media_snd_device_create() fails */ 567 media_snd_device_create(chip, intf); 568 } 569 570 usb_chip[chip->index] = chip; 571 chip->num_interfaces++; 572 usb_set_intfdata(intf, chip); 573 atomic_dec(&chip->active); 574 mutex_unlock(®ister_mutex); 575 return 0; 576 577 __error: 578 if (chip) { 579 if (!chip->num_interfaces) 580 snd_card_free(chip->card); 581 atomic_dec(&chip->active); 582 } 583 mutex_unlock(®ister_mutex); 584 return err; 585 } 586 587 /* 588 * we need to take care of counter, since disconnection can be called also 589 * many times as well as usb_audio_probe(). 590 */ 591 static void usb_audio_disconnect(struct usb_interface *intf) 592 { 593 struct snd_usb_audio *chip = usb_get_intfdata(intf); 594 struct snd_card *card; 595 struct list_head *p; 596 597 if (chip == (void *)-1L) 598 return; 599 600 card = chip->card; 601 602 mutex_lock(®ister_mutex); 603 if (atomic_inc_return(&chip->shutdown) == 1) { 604 struct snd_usb_stream *as; 605 struct snd_usb_endpoint *ep; 606 struct usb_mixer_interface *mixer; 607 608 /* wait until all pending tasks done; 609 * they are protected by snd_usb_lock_shutdown() 610 */ 611 wait_event(chip->shutdown_wait, 612 !atomic_read(&chip->usage_count)); 613 snd_card_disconnect(card); 614 /* release the pcm resources */ 615 list_for_each_entry(as, &chip->pcm_list, list) { 616 snd_usb_stream_disconnect(as); 617 } 618 /* release the endpoint resources */ 619 list_for_each_entry(ep, &chip->ep_list, list) { 620 snd_usb_endpoint_release(ep); 621 } 622 /* release the midi resources */ 623 list_for_each(p, &chip->midi_list) { 624 snd_usbmidi_disconnect(p); 625 } 626 /* 627 * Nice to check quirk && quirk->media_device 628 * need some special handlings. Doesn't look like 629 * we have access to quirk here 630 * Acceses mixer_list 631 */ 632 media_snd_device_delete(chip); 633 634 /* release mixer resources */ 635 list_for_each_entry(mixer, &chip->mixer_list, list) { 636 snd_usb_mixer_disconnect(mixer); 637 } 638 } 639 640 chip->num_interfaces--; 641 if (chip->num_interfaces <= 0) { 642 usb_chip[chip->index] = NULL; 643 mutex_unlock(®ister_mutex); 644 snd_card_free_when_closed(card); 645 } else { 646 mutex_unlock(®ister_mutex); 647 } 648 } 649 650 /* lock the shutdown (disconnect) task and autoresume */ 651 int snd_usb_lock_shutdown(struct snd_usb_audio *chip) 652 { 653 int err; 654 655 atomic_inc(&chip->usage_count); 656 if (atomic_read(&chip->shutdown)) { 657 err = -EIO; 658 goto error; 659 } 660 err = snd_usb_autoresume(chip); 661 if (err < 0) 662 goto error; 663 return 0; 664 665 error: 666 if (atomic_dec_and_test(&chip->usage_count)) 667 wake_up(&chip->shutdown_wait); 668 return err; 669 } 670 671 /* autosuspend and unlock the shutdown */ 672 void snd_usb_unlock_shutdown(struct snd_usb_audio *chip) 673 { 674 snd_usb_autosuspend(chip); 675 if (atomic_dec_and_test(&chip->usage_count)) 676 wake_up(&chip->shutdown_wait); 677 } 678 679 #ifdef CONFIG_PM 680 681 int snd_usb_autoresume(struct snd_usb_audio *chip) 682 { 683 if (atomic_read(&chip->shutdown)) 684 return -EIO; 685 if (atomic_inc_return(&chip->active) == 1) 686 return usb_autopm_get_interface(chip->pm_intf); 687 return 0; 688 } 689 690 void snd_usb_autosuspend(struct snd_usb_audio *chip) 691 { 692 if (atomic_read(&chip->shutdown)) 693 return; 694 if (atomic_dec_and_test(&chip->active)) 695 usb_autopm_put_interface(chip->pm_intf); 696 } 697 698 static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message) 699 { 700 struct snd_usb_audio *chip = usb_get_intfdata(intf); 701 struct snd_usb_stream *as; 702 struct usb_mixer_interface *mixer; 703 struct list_head *p; 704 705 if (chip == (void *)-1L) 706 return 0; 707 708 chip->autosuspended = !!PMSG_IS_AUTO(message); 709 if (!chip->autosuspended) 710 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot); 711 if (!chip->num_suspended_intf++) { 712 list_for_each_entry(as, &chip->pcm_list, list) { 713 snd_pcm_suspend_all(as->pcm); 714 as->substream[0].need_setup_ep = 715 as->substream[1].need_setup_ep = true; 716 } 717 list_for_each(p, &chip->midi_list) 718 snd_usbmidi_suspend(p); 719 list_for_each_entry(mixer, &chip->mixer_list, list) 720 snd_usb_mixer_suspend(mixer); 721 } 722 723 return 0; 724 } 725 726 static 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; 756 757 err_out: 758 atomic_dec(&chip->active); /* allow autopm after this point */ 759 return err; 760 } 761 762 static int usb_audio_resume(struct usb_interface *intf) 763 { 764 return __usb_audio_resume(intf, false); 765 } 766 767 static 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 */ 776 777 static 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 }; 784 MODULE_DEVICE_TABLE(usb, usb_audio_ids); 785 786 /* 787 * entry point for linux usb interface 788 */ 789 790 static 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 }; 800 801 module_usb_driver(usb_audio_driver); 802