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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * (Tentative) USB Audio Driver for ALSA
4 *
5 * Copyright (c) 2002 by Takashi Iwai <tiwai@suse.de>
6 *
7 * Many codes borrowed from audio.c by
8 * Alan Cox (alan@lxorguk.ukuu.org.uk)
9 * Thomas Sailer (sailer@ife.ee.ethz.ch)
10 *
11 * Audio Class 3.0 support by Ruslan Bilovol <ruslan.bilovol@gmail.com>
12 *
13 * NOTES:
14 *
15 * - the linked URBs would be preferred but not used so far because of
16 * the instability of unlinking.
17 * - type II is not supported properly. there is no device which supports
18 * this type *correctly*. SB extigy looks as if it supports, but it's
19 * indeed an AC3 stream packed in SPDIF frames (i.e. no real AC3 stream).
20 */
21
22
23#include <linux/bitops.h>
24#include <linux/init.h>
25#include <linux/list.h>
26#include <linux/slab.h>
27#include <linux/string.h>
28#include <linux/ctype.h>
29#include <linux/usb.h>
30#include <linux/moduleparam.h>
31#include <linux/mutex.h>
32#include <linux/usb/audio.h>
33#include <linux/usb/audio-v2.h>
34#include <linux/usb/audio-v3.h>
35#include <linux/module.h>
36
37#include <sound/control.h>
38#include <sound/core.h>
39#include <sound/info.h>
40#include <sound/pcm.h>
41#include <sound/pcm_params.h>
42#include <sound/initval.h>
43
44#include "usbaudio.h"
45#include "card.h"
46#include "midi.h"
47#include "mixer.h"
48#include "proc.h"
49#include "quirks.h"
50#include "endpoint.h"
51#include "helper.h"
52#include "pcm.h"
53#include "format.h"
54#include "power.h"
55#include "stream.h"
56#include "media.h"
57
58MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
59MODULE_DESCRIPTION("USB Audio");
60MODULE_LICENSE("GPL");
61
62static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */
63static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */
64static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;/* Enable this card */
65/* Vendor/product IDs for this card */
66static int vid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 };
67static int pid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 };
68static int device_setup[SNDRV_CARDS]; /* device parameter for this card */
69static bool ignore_ctl_error;
70static bool autoclock = true;
71static bool lowlatency = true;
72static char *quirk_alias[SNDRV_CARDS];
73static char *delayed_register[SNDRV_CARDS];
74static bool implicit_fb[SNDRV_CARDS];
75static unsigned int quirk_flags[SNDRV_CARDS];
76
77bool snd_usb_use_vmalloc = true;
78bool snd_usb_skip_validation;
79
80module_param_array(index, int, NULL, 0444);
81MODULE_PARM_DESC(index, "Index value for the USB audio adapter.");
82module_param_array(id, charp, NULL, 0444);
83MODULE_PARM_DESC(id, "ID string for the USB audio adapter.");
84module_param_array(enable, bool, NULL, 0444);
85MODULE_PARM_DESC(enable, "Enable USB audio adapter.");
86module_param_array(vid, int, NULL, 0444);
87MODULE_PARM_DESC(vid, "Vendor ID for the USB audio device.");
88module_param_array(pid, int, NULL, 0444);
89MODULE_PARM_DESC(pid, "Product ID for the USB audio device.");
90module_param_array(device_setup, int, NULL, 0444);
91MODULE_PARM_DESC(device_setup, "Specific device setup (if needed).");
92module_param(ignore_ctl_error, bool, 0444);
93MODULE_PARM_DESC(ignore_ctl_error,
94 "Ignore errors from USB controller for mixer interfaces.");
95module_param(autoclock, bool, 0444);
96MODULE_PARM_DESC(autoclock, "Enable auto-clock selection for UAC2 devices (default: yes).");
97module_param(lowlatency, bool, 0444);
98MODULE_PARM_DESC(lowlatency, "Enable low latency playback (default: yes).");
99module_param_array(quirk_alias, charp, NULL, 0444);
100MODULE_PARM_DESC(quirk_alias, "Quirk aliases, e.g. 0123abcd:5678beef.");
101module_param_array(delayed_register, charp, NULL, 0444);
102MODULE_PARM_DESC(delayed_register, "Quirk for delayed registration, given by id:iface, e.g. 0123abcd:4.");
103module_param_array(implicit_fb, bool, NULL, 0444);
104MODULE_PARM_DESC(implicit_fb, "Apply generic implicit feedback sync mode.");
105module_param_array(quirk_flags, uint, NULL, 0444);
106MODULE_PARM_DESC(quirk_flags, "Driver quirk bit flags.");
107module_param_named(use_vmalloc, snd_usb_use_vmalloc, bool, 0444);
108MODULE_PARM_DESC(use_vmalloc, "Use vmalloc for PCM intermediate buffers (default: yes).");
109module_param_named(skip_validation, snd_usb_skip_validation, bool, 0444);
110MODULE_PARM_DESC(skip_validation, "Skip unit descriptor validation (default: no).");
111
112/*
113 * we keep the snd_usb_audio_t instances by ourselves for merging
114 * the all interfaces on the same card as one sound device.
115 */
116
117static DEFINE_MUTEX(register_mutex);
118static struct snd_usb_audio *usb_chip[SNDRV_CARDS];
119static struct usb_driver usb_audio_driver;
120
121/*
122 * disconnect streams
123 * called from usb_audio_disconnect()
124 */
125static void snd_usb_stream_disconnect(struct snd_usb_stream *as)
126{
127 int idx;
128 struct snd_usb_substream *subs;
129
130 for (idx = 0; idx < 2; idx++) {
131 subs = &as->substream[idx];
132 if (!subs->num_formats)
133 continue;
134 subs->data_endpoint = NULL;
135 subs->sync_endpoint = NULL;
136 }
137}
138
139static int snd_usb_create_stream(struct snd_usb_audio *chip, int ctrlif, int interface)
140{
141 struct usb_device *dev = chip->dev;
142 struct usb_host_interface *alts;
143 struct usb_interface_descriptor *altsd;
144 struct usb_interface *iface = usb_ifnum_to_if(dev, interface);
145
146 if (!iface) {
147 dev_err(&dev->dev, "%u:%d : does not exist\n",
148 ctrlif, interface);
149 return -EINVAL;
150 }
151
152 alts = &iface->altsetting[0];
153 altsd = get_iface_desc(alts);
154
155 /*
156 * Android with both accessory and audio interfaces enabled gets the
157 * interface numbers wrong.
158 */
159 if ((chip->usb_id == USB_ID(0x18d1, 0x2d04) ||
160 chip->usb_id == USB_ID(0x18d1, 0x2d05)) &&
161 interface == 0 &&
162 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
163 altsd->bInterfaceSubClass == USB_SUBCLASS_VENDOR_SPEC) {
164 interface = 2;
165 iface = usb_ifnum_to_if(dev, interface);
166 if (!iface)
167 return -EINVAL;
168 alts = &iface->altsetting[0];
169 altsd = get_iface_desc(alts);
170 }
171
172 if (usb_interface_claimed(iface)) {
173 dev_dbg(&dev->dev, "%d:%d: skipping, already claimed\n",
174 ctrlif, interface);
175 return -EINVAL;
176 }
177
178 if ((altsd->bInterfaceClass == USB_CLASS_AUDIO ||
179 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC) &&
180 altsd->bInterfaceSubClass == USB_SUBCLASS_MIDISTREAMING) {
181 int err = __snd_usbmidi_create(chip->card, iface,
182 &chip->midi_list, NULL,
183 chip->usb_id);
184 if (err < 0) {
185 dev_err(&dev->dev,
186 "%u:%d: cannot create sequencer device\n",
187 ctrlif, interface);
188 return -EINVAL;
189 }
190 return usb_driver_claim_interface(&usb_audio_driver, iface,
191 USB_AUDIO_IFACE_UNUSED);
192 }
193
194 if ((altsd->bInterfaceClass != USB_CLASS_AUDIO &&
195 altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
196 altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING) {
197 dev_dbg(&dev->dev,
198 "%u:%d: skipping non-supported interface %d\n",
199 ctrlif, interface, altsd->bInterfaceClass);
200 /* skip non-supported classes */
201 return -EINVAL;
202 }
203
204 if (snd_usb_get_speed(dev) == USB_SPEED_LOW) {
205 dev_err(&dev->dev, "low speed audio streaming not supported\n");
206 return -EINVAL;
207 }
208
209 if (! snd_usb_parse_audio_interface(chip, interface)) {
210 usb_set_interface(dev, interface, 0); /* reset the current interface */
211 return usb_driver_claim_interface(&usb_audio_driver, iface,
212 USB_AUDIO_IFACE_UNUSED);
213 }
214
215 return 0;
216}
217
218/*
219 * parse audio control descriptor and create pcm/midi streams
220 */
221static int snd_usb_create_streams(struct snd_usb_audio *chip, int ctrlif)
222{
223 struct usb_device *dev = chip->dev;
224 struct usb_host_interface *host_iface;
225 struct usb_interface_descriptor *altsd;
226 int i, protocol;
227
228 /* find audiocontrol interface */
229 host_iface = &usb_ifnum_to_if(dev, ctrlif)->altsetting[0];
230 altsd = get_iface_desc(host_iface);
231 protocol = altsd->bInterfaceProtocol;
232
233 switch (protocol) {
234 default:
235 dev_warn(&dev->dev,
236 "unknown interface protocol %#02x, assuming v1\n",
237 protocol);
238 fallthrough;
239
240 case UAC_VERSION_1: {
241 struct uac1_ac_header_descriptor *h1;
242 int rest_bytes;
243
244 h1 = snd_usb_find_csint_desc(host_iface->extra,
245 host_iface->extralen,
246 NULL, UAC_HEADER);
247 if (!h1 || h1->bLength < sizeof(*h1)) {
248 dev_err(&dev->dev, "cannot find UAC_HEADER\n");
249 return -EINVAL;
250 }
251
252 rest_bytes = (void *)(host_iface->extra +
253 host_iface->extralen) - (void *)h1;
254
255 /* just to be sure -- this shouldn't hit at all */
256 if (rest_bytes <= 0) {
257 dev_err(&dev->dev, "invalid control header\n");
258 return -EINVAL;
259 }
260
261 if (rest_bytes < sizeof(*h1)) {
262 dev_err(&dev->dev, "too short v1 buffer descriptor\n");
263 return -EINVAL;
264 }
265
266 if (!h1->bInCollection) {
267 dev_info(&dev->dev, "skipping empty audio interface (v1)\n");
268 return -EINVAL;
269 }
270
271 if (rest_bytes < h1->bLength) {
272 dev_err(&dev->dev, "invalid buffer length (v1)\n");
273 return -EINVAL;
274 }
275
276 if (h1->bLength < sizeof(*h1) + h1->bInCollection) {
277 dev_err(&dev->dev, "invalid UAC_HEADER (v1)\n");
278 return -EINVAL;
279 }
280
281 for (i = 0; i < h1->bInCollection; i++)
282 snd_usb_create_stream(chip, ctrlif, h1->baInterfaceNr[i]);
283
284 break;
285 }
286
287 case UAC_VERSION_2:
288 case UAC_VERSION_3: {
289 struct usb_interface_assoc_descriptor *assoc =
290 usb_ifnum_to_if(dev, ctrlif)->intf_assoc;
291
292 if (!assoc) {
293 /*
294 * Firmware writers cannot count to three. So to find
295 * the IAD on the NuForce UDH-100, also check the next
296 * interface.
297 */
298 struct usb_interface *iface =
299 usb_ifnum_to_if(dev, ctrlif + 1);
300 if (iface &&
301 iface->intf_assoc &&
302 iface->intf_assoc->bFunctionClass == USB_CLASS_AUDIO &&
303 iface->intf_assoc->bFunctionProtocol == UAC_VERSION_2)
304 assoc = iface->intf_assoc;
305 }
306
307 if (!assoc) {
308 dev_err(&dev->dev, "Audio class v2/v3 interfaces need an interface association\n");
309 return -EINVAL;
310 }
311
312 if (protocol == UAC_VERSION_3) {
313 int badd = assoc->bFunctionSubClass;
314
315 if (badd != UAC3_FUNCTION_SUBCLASS_FULL_ADC_3_0 &&
316 (badd < UAC3_FUNCTION_SUBCLASS_GENERIC_IO ||
317 badd > UAC3_FUNCTION_SUBCLASS_SPEAKERPHONE)) {
318 dev_err(&dev->dev,
319 "Unsupported UAC3 BADD profile\n");
320 return -EINVAL;
321 }
322
323 chip->badd_profile = badd;
324 }
325
326 for (i = 0; i < assoc->bInterfaceCount; i++) {
327 int intf = assoc->bFirstInterface + i;
328
329 if (intf != ctrlif)
330 snd_usb_create_stream(chip, ctrlif, intf);
331 }
332
333 break;
334 }
335 }
336
337 return 0;
338}
339
340/*
341 * Profile name preset table
342 */
343struct usb_audio_device_name {
344 u32 id;
345 const char *vendor_name;
346 const char *product_name;
347 const char *profile_name; /* override card->longname */
348};
349
350#define PROFILE_NAME(vid, pid, vendor, product, profile) \
351 { .id = USB_ID(vid, pid), .vendor_name = (vendor), \
352 .product_name = (product), .profile_name = (profile) }
353#define DEVICE_NAME(vid, pid, vendor, product) \
354 PROFILE_NAME(vid, pid, vendor, product, NULL)
355
356/* vendor/product and profile name presets, sorted in device id order */
357static const struct usb_audio_device_name usb_audio_names[] = {
358 /* HP Thunderbolt Dock Audio Headset */
359 PROFILE_NAME(0x03f0, 0x0269, "HP", "Thunderbolt Dock Audio Headset",
360 "HP-Thunderbolt-Dock-Audio-Headset"),
361 /* HP Thunderbolt Dock Audio Module */
362 PROFILE_NAME(0x03f0, 0x0567, "HP", "Thunderbolt Dock Audio Module",
363 "HP-Thunderbolt-Dock-Audio-Module"),
364
365 /* Two entries for Gigabyte TRX40 Aorus Master:
366 * TRX40 Aorus Master has two USB-audio devices, one for the front
367 * headphone with ESS SABRE9218 DAC chip, while another for the rest
368 * I/O (the rear panel and the front mic) with Realtek ALC1220-VB.
369 * Here we provide two distinct names for making UCM profiles easier.
370 */
371 PROFILE_NAME(0x0414, 0xa000, "Gigabyte", "Aorus Master Front Headphone",
372 "Gigabyte-Aorus-Master-Front-Headphone"),
373 PROFILE_NAME(0x0414, 0xa001, "Gigabyte", "Aorus Master Main Audio",
374 "Gigabyte-Aorus-Master-Main-Audio"),
375
376 /* Gigabyte TRX40 Aorus Pro WiFi */
377 PROFILE_NAME(0x0414, 0xa002,
378 "Realtek", "ALC1220-VB-DT", "Realtek-ALC1220-VB-Desktop"),
379
380 /* Creative/E-Mu devices */
381 DEVICE_NAME(0x041e, 0x3010, "Creative Labs", "Sound Blaster MP3+"),
382 /* Creative/Toshiba Multimedia Center SB-0500 */
383 DEVICE_NAME(0x041e, 0x3048, "Toshiba", "SB-0500"),
384
385 DEVICE_NAME(0x046d, 0x0990, "Logitech, Inc.", "QuickCam Pro 9000"),
386
387 DEVICE_NAME(0x05e1, 0x0408, "Syntek", "STK1160"),
388 DEVICE_NAME(0x05e1, 0x0480, "Hauppauge", "Woodbury"),
389
390 /* ASUS ROG Zenith II: this machine has also two devices, one for
391 * the front headphone and another for the rest
392 */
393 PROFILE_NAME(0x0b05, 0x1915, "ASUS", "Zenith II Front Headphone",
394 "Zenith-II-Front-Headphone"),
395 PROFILE_NAME(0x0b05, 0x1916, "ASUS", "Zenith II Main Audio",
396 "Zenith-II-Main-Audio"),
397
398 /* ASUS ROG Strix */
399 PROFILE_NAME(0x0b05, 0x1917,
400 "Realtek", "ALC1220-VB-DT", "Realtek-ALC1220-VB-Desktop"),
401 /* ASUS PRIME TRX40 PRO-S */
402 PROFILE_NAME(0x0b05, 0x1918,
403 "Realtek", "ALC1220-VB-DT", "Realtek-ALC1220-VB-Desktop"),
404
405 /* Dell WD15 Dock */
406 PROFILE_NAME(0x0bda, 0x4014, "Dell", "WD15 Dock", "Dell-WD15-Dock"),
407 /* Dell WD19 Dock */
408 PROFILE_NAME(0x0bda, 0x402e, "Dell", "WD19 Dock", "Dell-WD15-Dock"),
409
410 DEVICE_NAME(0x0ccd, 0x0028, "TerraTec", "Aureon5.1MkII"),
411
412 /*
413 * The original product_name is "USB Sound Device", however this name
414 * is also used by the CM106 based cards, so make it unique.
415 */
416 DEVICE_NAME(0x0d8c, 0x0102, NULL, "ICUSBAUDIO7D"),
417 DEVICE_NAME(0x0d8c, 0x0103, NULL, "Audio Advantage MicroII"),
418
419 /* MSI TRX40 Creator */
420 PROFILE_NAME(0x0db0, 0x0d64,
421 "Realtek", "ALC1220-VB-DT", "Realtek-ALC1220-VB-Desktop"),
422 /* MSI TRX40 */
423 PROFILE_NAME(0x0db0, 0x543d,
424 "Realtek", "ALC1220-VB-DT", "Realtek-ALC1220-VB-Desktop"),
425
426 DEVICE_NAME(0x0fd9, 0x0008, "Hauppauge", "HVR-950Q"),
427
428 /* Stanton/N2IT Final Scratch v1 device ('Scratchamp') */
429 DEVICE_NAME(0x103d, 0x0100, "Stanton", "ScratchAmp"),
430 DEVICE_NAME(0x103d, 0x0101, "Stanton", "ScratchAmp"),
431
432 /* aka. Serato Scratch Live DJ Box */
433 DEVICE_NAME(0x13e5, 0x0001, "Rane", "SL-1"),
434
435 /* Lenovo ThinkStation P620 Rear Line-in, Line-out and Microphone */
436 PROFILE_NAME(0x17aa, 0x1046, "Lenovo", "ThinkStation P620 Rear",
437 "Lenovo-ThinkStation-P620-Rear"),
438 /* Lenovo ThinkStation P620 Internal Speaker + Front Headset */
439 PROFILE_NAME(0x17aa, 0x104d, "Lenovo", "ThinkStation P620 Main",
440 "Lenovo-ThinkStation-P620-Main"),
441
442 /* Asrock TRX40 Creator */
443 PROFILE_NAME(0x26ce, 0x0a01,
444 "Realtek", "ALC1220-VB-DT", "Realtek-ALC1220-VB-Desktop"),
445
446 DEVICE_NAME(0x2040, 0x7200, "Hauppauge", "HVR-950Q"),
447 DEVICE_NAME(0x2040, 0x7201, "Hauppauge", "HVR-950Q-MXL"),
448 DEVICE_NAME(0x2040, 0x7210, "Hauppauge", "HVR-950Q"),
449 DEVICE_NAME(0x2040, 0x7211, "Hauppauge", "HVR-950Q-MXL"),
450 DEVICE_NAME(0x2040, 0x7213, "Hauppauge", "HVR-950Q"),
451 DEVICE_NAME(0x2040, 0x7217, "Hauppauge", "HVR-950Q"),
452 DEVICE_NAME(0x2040, 0x721b, "Hauppauge", "HVR-950Q"),
453 DEVICE_NAME(0x2040, 0x721e, "Hauppauge", "HVR-950Q"),
454 DEVICE_NAME(0x2040, 0x721f, "Hauppauge", "HVR-950Q"),
455 DEVICE_NAME(0x2040, 0x7240, "Hauppauge", "HVR-850"),
456 DEVICE_NAME(0x2040, 0x7260, "Hauppauge", "HVR-950Q"),
457 DEVICE_NAME(0x2040, 0x7270, "Hauppauge", "HVR-950Q"),
458 DEVICE_NAME(0x2040, 0x7280, "Hauppauge", "HVR-950Q"),
459 DEVICE_NAME(0x2040, 0x7281, "Hauppauge", "HVR-950Q-MXL"),
460 DEVICE_NAME(0x2040, 0x8200, "Hauppauge", "Woodbury"),
461
462 { } /* terminator */
463};
464
465static const struct usb_audio_device_name *
466lookup_device_name(u32 id)
467{
468 static const struct usb_audio_device_name *p;
469
470 for (p = usb_audio_names; p->id; p++)
471 if (p->id == id)
472 return p;
473 return NULL;
474}
475
476/*
477 * free the chip instance
478 *
479 * here we have to do not much, since pcm and controls are already freed
480 *
481 */
482
483static void snd_usb_audio_free(struct snd_card *card)
484{
485 struct snd_usb_audio *chip = card->private_data;
486
487 snd_usb_endpoint_free_all(chip);
488
489 mutex_destroy(&chip->mutex);
490 if (!atomic_read(&chip->shutdown))
491 dev_set_drvdata(&chip->dev->dev, NULL);
492}
493
494static void usb_audio_make_shortname(struct usb_device *dev,
495 struct snd_usb_audio *chip,
496 const struct snd_usb_audio_quirk *quirk)
497{
498 struct snd_card *card = chip->card;
499 const struct usb_audio_device_name *preset;
500 const char *s = NULL;
501
502 preset = lookup_device_name(chip->usb_id);
503 if (preset && preset->product_name)
504 s = preset->product_name;
505 else if (quirk && quirk->product_name)
506 s = quirk->product_name;
507 if (s && *s) {
508 strscpy(card->shortname, s, sizeof(card->shortname));
509 return;
510 }
511
512 /* retrieve the device string as shortname */
513 if (!dev->descriptor.iProduct ||
514 usb_string(dev, dev->descriptor.iProduct,
515 card->shortname, sizeof(card->shortname)) <= 0) {
516 /* no name available from anywhere, so use ID */
517 sprintf(card->shortname, "USB Device %#04x:%#04x",
518 USB_ID_VENDOR(chip->usb_id),
519 USB_ID_PRODUCT(chip->usb_id));
520 }
521
522 strim(card->shortname);
523}
524
525static void usb_audio_make_longname(struct usb_device *dev,
526 struct snd_usb_audio *chip,
527 const struct snd_usb_audio_quirk *quirk)
528{
529 struct snd_card *card = chip->card;
530 const struct usb_audio_device_name *preset;
531 const char *s = NULL;
532 int len;
533
534 preset = lookup_device_name(chip->usb_id);
535
536 /* shortcut - if any pre-defined string is given, use it */
537 if (preset && preset->profile_name)
538 s = preset->profile_name;
539 if (s && *s) {
540 strscpy(card->longname, s, sizeof(card->longname));
541 return;
542 }
543
544 if (preset && preset->vendor_name)
545 s = preset->vendor_name;
546 else if (quirk && quirk->vendor_name)
547 s = quirk->vendor_name;
548 *card->longname = 0;
549 if (s && *s) {
550 strscpy(card->longname, s, sizeof(card->longname));
551 } else {
552 /* retrieve the vendor and device strings as longname */
553 if (dev->descriptor.iManufacturer)
554 usb_string(dev, dev->descriptor.iManufacturer,
555 card->longname, sizeof(card->longname));
556 /* we don't really care if there isn't any vendor string */
557 }
558 if (*card->longname) {
559 strim(card->longname);
560 if (*card->longname)
561 strlcat(card->longname, " ", sizeof(card->longname));
562 }
563
564 strlcat(card->longname, card->shortname, sizeof(card->longname));
565
566 len = strlcat(card->longname, " at ", sizeof(card->longname));
567
568 if (len < sizeof(card->longname))
569 usb_make_path(dev, card->longname + len, sizeof(card->longname) - len);
570
571 switch (snd_usb_get_speed(dev)) {
572 case USB_SPEED_LOW:
573 strlcat(card->longname, ", low speed", sizeof(card->longname));
574 break;
575 case USB_SPEED_FULL:
576 strlcat(card->longname, ", full speed", sizeof(card->longname));
577 break;
578 case USB_SPEED_HIGH:
579 strlcat(card->longname, ", high speed", sizeof(card->longname));
580 break;
581 case USB_SPEED_SUPER:
582 strlcat(card->longname, ", super speed", sizeof(card->longname));
583 break;
584 case USB_SPEED_SUPER_PLUS:
585 strlcat(card->longname, ", super speed plus", sizeof(card->longname));
586 break;
587 default:
588 break;
589 }
590}
591
592/*
593 * create a chip instance and set its names.
594 */
595static int snd_usb_audio_create(struct usb_interface *intf,
596 struct usb_device *dev, int idx,
597 const struct snd_usb_audio_quirk *quirk,
598 unsigned int usb_id,
599 struct snd_usb_audio **rchip)
600{
601 struct snd_card *card;
602 struct snd_usb_audio *chip;
603 int err;
604 char component[14];
605
606 *rchip = NULL;
607
608 switch (snd_usb_get_speed(dev)) {
609 case USB_SPEED_LOW:
610 case USB_SPEED_FULL:
611 case USB_SPEED_HIGH:
612 case USB_SPEED_WIRELESS:
613 case USB_SPEED_SUPER:
614 case USB_SPEED_SUPER_PLUS:
615 break;
616 default:
617 dev_err(&dev->dev, "unknown device speed %d\n", snd_usb_get_speed(dev));
618 return -ENXIO;
619 }
620
621 err = snd_card_new(&intf->dev, index[idx], id[idx], THIS_MODULE,
622 sizeof(*chip), &card);
623 if (err < 0) {
624 dev_err(&dev->dev, "cannot create card instance %d\n", idx);
625 return err;
626 }
627
628 chip = card->private_data;
629 mutex_init(&chip->mutex);
630 init_waitqueue_head(&chip->shutdown_wait);
631 chip->index = idx;
632 chip->dev = dev;
633 chip->card = card;
634 chip->setup = device_setup[idx];
635 chip->generic_implicit_fb = implicit_fb[idx];
636 chip->autoclock = autoclock;
637 chip->lowlatency = lowlatency;
638 atomic_set(&chip->active, 1); /* avoid autopm during probing */
639 atomic_set(&chip->usage_count, 0);
640 atomic_set(&chip->shutdown, 0);
641
642 chip->usb_id = usb_id;
643 INIT_LIST_HEAD(&chip->pcm_list);
644 INIT_LIST_HEAD(&chip->ep_list);
645 INIT_LIST_HEAD(&chip->iface_ref_list);
646 INIT_LIST_HEAD(&chip->clock_ref_list);
647 INIT_LIST_HEAD(&chip->midi_list);
648 INIT_LIST_HEAD(&chip->mixer_list);
649
650 if (quirk_flags[idx])
651 chip->quirk_flags = quirk_flags[idx];
652 else
653 snd_usb_init_quirk_flags(chip);
654
655 card->private_free = snd_usb_audio_free;
656
657 strcpy(card->driver, "USB-Audio");
658 sprintf(component, "USB%04x:%04x",
659 USB_ID_VENDOR(chip->usb_id), USB_ID_PRODUCT(chip->usb_id));
660 snd_component_add(card, component);
661
662 usb_audio_make_shortname(dev, chip, quirk);
663 usb_audio_make_longname(dev, chip, quirk);
664
665 snd_usb_audio_create_proc(chip);
666
667 *rchip = chip;
668 return 0;
669}
670
671/* look for a matching quirk alias id */
672static bool get_alias_id(struct usb_device *dev, unsigned int *id)
673{
674 int i;
675 unsigned int src, dst;
676
677 for (i = 0; i < ARRAY_SIZE(quirk_alias); i++) {
678 if (!quirk_alias[i] ||
679 sscanf(quirk_alias[i], "%x:%x", &src, &dst) != 2 ||
680 src != *id)
681 continue;
682 dev_info(&dev->dev,
683 "device (%04x:%04x): applying quirk alias %04x:%04x\n",
684 USB_ID_VENDOR(*id), USB_ID_PRODUCT(*id),
685 USB_ID_VENDOR(dst), USB_ID_PRODUCT(dst));
686 *id = dst;
687 return true;
688 }
689
690 return false;
691}
692
693static int check_delayed_register_option(struct snd_usb_audio *chip)
694{
695 int i;
696 unsigned int id, inum;
697
698 for (i = 0; i < ARRAY_SIZE(delayed_register); i++) {
699 if (delayed_register[i] &&
700 sscanf(delayed_register[i], "%x:%x", &id, &inum) == 2 &&
701 id == chip->usb_id)
702 return inum;
703 }
704
705 return -1;
706}
707
708static const struct usb_device_id usb_audio_ids[]; /* defined below */
709
710/* look for the last interface that matches with our ids and remember it */
711static void find_last_interface(struct snd_usb_audio *chip)
712{
713 struct usb_host_config *config = chip->dev->actconfig;
714 struct usb_interface *intf;
715 int i;
716
717 if (!config)
718 return;
719 for (i = 0; i < config->desc.bNumInterfaces; i++) {
720 intf = config->interface[i];
721 if (usb_match_id(intf, usb_audio_ids))
722 chip->last_iface = intf->altsetting[0].desc.bInterfaceNumber;
723 }
724 usb_audio_dbg(chip, "Found last interface = %d\n", chip->last_iface);
725}
726
727/* look for the corresponding quirk */
728static const struct snd_usb_audio_quirk *
729get_alias_quirk(struct usb_device *dev, unsigned int id)
730{
731 const struct usb_device_id *p;
732
733 for (p = usb_audio_ids; p->match_flags; p++) {
734 /* FIXME: this checks only vendor:product pair in the list */
735 if ((p->match_flags & USB_DEVICE_ID_MATCH_DEVICE) ==
736 USB_DEVICE_ID_MATCH_DEVICE &&
737 p->idVendor == USB_ID_VENDOR(id) &&
738 p->idProduct == USB_ID_PRODUCT(id))
739 return (const struct snd_usb_audio_quirk *)p->driver_info;
740 }
741
742 return NULL;
743}
744
745/* register card if we reach to the last interface or to the specified
746 * one given via option
747 */
748static int try_to_register_card(struct snd_usb_audio *chip, int ifnum)
749{
750 if (check_delayed_register_option(chip) == ifnum ||
751 chip->last_iface == ifnum ||
752 usb_interface_claimed(usb_ifnum_to_if(chip->dev, chip->last_iface)))
753 return snd_card_register(chip->card);
754 return 0;
755}
756
757/*
758 * probe the active usb device
759 *
760 * note that this can be called multiple times per a device, when it
761 * includes multiple audio control interfaces.
762 *
763 * thus we check the usb device pointer and creates the card instance
764 * only at the first time. the successive calls of this function will
765 * append the pcm interface to the corresponding card.
766 */
767static int usb_audio_probe(struct usb_interface *intf,
768 const struct usb_device_id *usb_id)
769{
770 struct usb_device *dev = interface_to_usbdev(intf);
771 const struct snd_usb_audio_quirk *quirk =
772 (const struct snd_usb_audio_quirk *)usb_id->driver_info;
773 struct snd_usb_audio *chip;
774 int i, err;
775 struct usb_host_interface *alts;
776 int ifnum;
777 u32 id;
778
779 alts = &intf->altsetting[0];
780 ifnum = get_iface_desc(alts)->bInterfaceNumber;
781 id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
782 le16_to_cpu(dev->descriptor.idProduct));
783 if (get_alias_id(dev, &id))
784 quirk = get_alias_quirk(dev, id);
785 if (quirk && quirk->ifnum >= 0 && ifnum != quirk->ifnum)
786 return -ENXIO;
787 if (quirk && quirk->ifnum == QUIRK_NODEV_INTERFACE)
788 return -ENODEV;
789
790 err = snd_usb_apply_boot_quirk(dev, intf, quirk, id);
791 if (err < 0)
792 return err;
793
794 /*
795 * found a config. now register to ALSA
796 */
797
798 /* check whether it's already registered */
799 chip = NULL;
800 mutex_lock(®ister_mutex);
801 for (i = 0; i < SNDRV_CARDS; i++) {
802 if (usb_chip[i] && usb_chip[i]->dev == dev) {
803 if (atomic_read(&usb_chip[i]->shutdown)) {
804 dev_err(&dev->dev, "USB device is in the shutdown state, cannot create a card instance\n");
805 err = -EIO;
806 goto __error;
807 }
808 chip = usb_chip[i];
809 atomic_inc(&chip->active); /* avoid autopm */
810 break;
811 }
812 }
813 if (! chip) {
814 err = snd_usb_apply_boot_quirk_once(dev, intf, quirk, id);
815 if (err < 0)
816 goto __error;
817
818 /* it's a fresh one.
819 * now look for an empty slot and create a new card instance
820 */
821 for (i = 0; i < SNDRV_CARDS; i++)
822 if (!usb_chip[i] &&
823 (vid[i] == -1 || vid[i] == USB_ID_VENDOR(id)) &&
824 (pid[i] == -1 || pid[i] == USB_ID_PRODUCT(id))) {
825 if (enable[i]) {
826 err = snd_usb_audio_create(intf, dev, i, quirk,
827 id, &chip);
828 if (err < 0)
829 goto __error;
830 break;
831 } else if (vid[i] != -1 || pid[i] != -1) {
832 dev_info(&dev->dev,
833 "device (%04x:%04x) is disabled\n",
834 USB_ID_VENDOR(id),
835 USB_ID_PRODUCT(id));
836 err = -ENOENT;
837 goto __error;
838 }
839 }
840 if (!chip) {
841 dev_err(&dev->dev, "no available usb audio device\n");
842 err = -ENODEV;
843 goto __error;
844 }
845 find_last_interface(chip);
846 }
847
848 if (chip->num_interfaces >= MAX_CARD_INTERFACES) {
849 dev_info(&dev->dev, "Too many interfaces assigned to the single USB-audio card\n");
850 err = -EINVAL;
851 goto __error;
852 }
853
854 dev_set_drvdata(&dev->dev, chip);
855
856 if (ignore_ctl_error)
857 chip->quirk_flags |= QUIRK_FLAG_IGNORE_CTL_ERROR;
858
859 if (chip->quirk_flags & QUIRK_FLAG_DISABLE_AUTOSUSPEND)
860 usb_disable_autosuspend(interface_to_usbdev(intf));
861
862 /*
863 * For devices with more than one control interface, we assume the
864 * first contains the audio controls. We might need a more specific
865 * check here in the future.
866 */
867 if (!chip->ctrl_intf)
868 chip->ctrl_intf = alts;
869
870 err = 1; /* continue */
871 if (quirk && quirk->ifnum != QUIRK_NO_INTERFACE) {
872 /* need some special handlings */
873 err = snd_usb_create_quirk(chip, intf, &usb_audio_driver, quirk);
874 if (err < 0)
875 goto __error;
876 }
877
878 if (err > 0) {
879 /* create normal USB audio interfaces */
880 err = snd_usb_create_streams(chip, ifnum);
881 if (err < 0)
882 goto __error;
883 err = snd_usb_create_mixer(chip, ifnum);
884 if (err < 0)
885 goto __error;
886 }
887
888 if (chip->need_delayed_register) {
889 dev_info(&dev->dev,
890 "Found post-registration device assignment: %08x:%02x\n",
891 chip->usb_id, ifnum);
892 chip->need_delayed_register = false; /* clear again */
893 }
894
895 err = try_to_register_card(chip, ifnum);
896 if (err < 0)
897 goto __error_no_register;
898
899 if (chip->quirk_flags & QUIRK_FLAG_SHARE_MEDIA_DEVICE) {
900 /* don't want to fail when snd_media_device_create() fails */
901 snd_media_device_create(chip, intf);
902 }
903
904 if (quirk)
905 chip->quirk_type = quirk->type;
906
907 usb_chip[chip->index] = chip;
908 chip->intf[chip->num_interfaces] = intf;
909 chip->num_interfaces++;
910 usb_set_intfdata(intf, chip);
911 atomic_dec(&chip->active);
912 mutex_unlock(®ister_mutex);
913 return 0;
914
915 __error:
916 /* in the case of error in secondary interface, still try to register */
917 if (chip)
918 try_to_register_card(chip, ifnum);
919
920 __error_no_register:
921 if (chip) {
922 /* chip->active is inside the chip->card object,
923 * decrement before memory is possibly returned.
924 */
925 atomic_dec(&chip->active);
926 if (!chip->num_interfaces)
927 snd_card_free(chip->card);
928 }
929 mutex_unlock(®ister_mutex);
930 return err;
931}
932
933/*
934 * we need to take care of counter, since disconnection can be called also
935 * many times as well as usb_audio_probe().
936 */
937static void usb_audio_disconnect(struct usb_interface *intf)
938{
939 struct snd_usb_audio *chip = usb_get_intfdata(intf);
940 struct snd_card *card;
941 struct list_head *p;
942
943 if (chip == USB_AUDIO_IFACE_UNUSED)
944 return;
945
946 card = chip->card;
947
948 mutex_lock(®ister_mutex);
949 if (atomic_inc_return(&chip->shutdown) == 1) {
950 struct snd_usb_stream *as;
951 struct snd_usb_endpoint *ep;
952 struct usb_mixer_interface *mixer;
953
954 /* wait until all pending tasks done;
955 * they are protected by snd_usb_lock_shutdown()
956 */
957 wait_event(chip->shutdown_wait,
958 !atomic_read(&chip->usage_count));
959 snd_card_disconnect(card);
960 /* release the pcm resources */
961 list_for_each_entry(as, &chip->pcm_list, list) {
962 snd_usb_stream_disconnect(as);
963 }
964 /* release the endpoint resources */
965 list_for_each_entry(ep, &chip->ep_list, list) {
966 snd_usb_endpoint_release(ep);
967 }
968 /* release the midi resources */
969 list_for_each(p, &chip->midi_list) {
970 snd_usbmidi_disconnect(p);
971 }
972 /*
973 * Nice to check quirk && quirk->shares_media_device and
974 * then call the snd_media_device_delete(). Don't have
975 * access to the quirk here. snd_media_device_delete()
976 * accesses mixer_list
977 */
978 snd_media_device_delete(chip);
979
980 /* release mixer resources */
981 list_for_each_entry(mixer, &chip->mixer_list, list) {
982 snd_usb_mixer_disconnect(mixer);
983 }
984 }
985
986 if (chip->quirk_flags & QUIRK_FLAG_DISABLE_AUTOSUSPEND)
987 usb_enable_autosuspend(interface_to_usbdev(intf));
988
989 chip->num_interfaces--;
990 if (chip->num_interfaces <= 0) {
991 usb_chip[chip->index] = NULL;
992 mutex_unlock(®ister_mutex);
993 snd_card_free_when_closed(card);
994 } else {
995 mutex_unlock(®ister_mutex);
996 }
997}
998
999/* lock the shutdown (disconnect) task and autoresume */
1000int snd_usb_lock_shutdown(struct snd_usb_audio *chip)
1001{
1002 int err;
1003
1004 atomic_inc(&chip->usage_count);
1005 if (atomic_read(&chip->shutdown)) {
1006 err = -EIO;
1007 goto error;
1008 }
1009 err = snd_usb_autoresume(chip);
1010 if (err < 0)
1011 goto error;
1012 return 0;
1013
1014 error:
1015 if (atomic_dec_and_test(&chip->usage_count))
1016 wake_up(&chip->shutdown_wait);
1017 return err;
1018}
1019
1020/* autosuspend and unlock the shutdown */
1021void snd_usb_unlock_shutdown(struct snd_usb_audio *chip)
1022{
1023 snd_usb_autosuspend(chip);
1024 if (atomic_dec_and_test(&chip->usage_count))
1025 wake_up(&chip->shutdown_wait);
1026}
1027
1028int snd_usb_autoresume(struct snd_usb_audio *chip)
1029{
1030 int i, err;
1031
1032 if (atomic_read(&chip->shutdown))
1033 return -EIO;
1034 if (atomic_inc_return(&chip->active) != 1)
1035 return 0;
1036
1037 for (i = 0; i < chip->num_interfaces; i++) {
1038 err = usb_autopm_get_interface(chip->intf[i]);
1039 if (err < 0) {
1040 /* rollback */
1041 while (--i >= 0)
1042 usb_autopm_put_interface(chip->intf[i]);
1043 atomic_dec(&chip->active);
1044 return err;
1045 }
1046 }
1047 return 0;
1048}
1049
1050void snd_usb_autosuspend(struct snd_usb_audio *chip)
1051{
1052 int i;
1053
1054 if (atomic_read(&chip->shutdown))
1055 return;
1056 if (!atomic_dec_and_test(&chip->active))
1057 return;
1058
1059 for (i = 0; i < chip->num_interfaces; i++)
1060 usb_autopm_put_interface(chip->intf[i]);
1061}
1062
1063static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message)
1064{
1065 struct snd_usb_audio *chip = usb_get_intfdata(intf);
1066 struct snd_usb_stream *as;
1067 struct snd_usb_endpoint *ep;
1068 struct usb_mixer_interface *mixer;
1069 struct list_head *p;
1070
1071 if (chip == USB_AUDIO_IFACE_UNUSED)
1072 return 0;
1073
1074 if (!chip->num_suspended_intf++) {
1075 list_for_each_entry(as, &chip->pcm_list, list)
1076 snd_usb_pcm_suspend(as);
1077 list_for_each_entry(ep, &chip->ep_list, list)
1078 snd_usb_endpoint_suspend(ep);
1079 list_for_each(p, &chip->midi_list)
1080 snd_usbmidi_suspend(p);
1081 list_for_each_entry(mixer, &chip->mixer_list, list)
1082 snd_usb_mixer_suspend(mixer);
1083 }
1084
1085 if (!PMSG_IS_AUTO(message) && !chip->system_suspend) {
1086 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot);
1087 chip->system_suspend = chip->num_suspended_intf;
1088 }
1089
1090 return 0;
1091}
1092
1093static int usb_audio_resume(struct usb_interface *intf)
1094{
1095 struct snd_usb_audio *chip = usb_get_intfdata(intf);
1096 struct snd_usb_stream *as;
1097 struct usb_mixer_interface *mixer;
1098 struct list_head *p;
1099 int err = 0;
1100
1101 if (chip == USB_AUDIO_IFACE_UNUSED)
1102 return 0;
1103
1104 atomic_inc(&chip->active); /* avoid autopm */
1105 if (chip->num_suspended_intf > 1)
1106 goto out;
1107
1108 list_for_each_entry(as, &chip->pcm_list, list) {
1109 err = snd_usb_pcm_resume(as);
1110 if (err < 0)
1111 goto err_out;
1112 }
1113
1114 /*
1115 * ALSA leaves material resumption to user space
1116 * we just notify and restart the mixers
1117 */
1118 list_for_each_entry(mixer, &chip->mixer_list, list) {
1119 err = snd_usb_mixer_resume(mixer);
1120 if (err < 0)
1121 goto err_out;
1122 }
1123
1124 list_for_each(p, &chip->midi_list) {
1125 snd_usbmidi_resume(p);
1126 }
1127
1128 out:
1129 if (chip->num_suspended_intf == chip->system_suspend) {
1130 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0);
1131 chip->system_suspend = 0;
1132 }
1133 chip->num_suspended_intf--;
1134
1135err_out:
1136 atomic_dec(&chip->active); /* allow autopm after this point */
1137 return err;
1138}
1139
1140static const struct usb_device_id usb_audio_ids [] = {
1141#include "quirks-table.h"
1142 { .match_flags = (USB_DEVICE_ID_MATCH_INT_CLASS | USB_DEVICE_ID_MATCH_INT_SUBCLASS),
1143 .bInterfaceClass = USB_CLASS_AUDIO,
1144 .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL },
1145 { } /* Terminating entry */
1146};
1147MODULE_DEVICE_TABLE(usb, usb_audio_ids);
1148
1149/*
1150 * entry point for linux usb interface
1151 */
1152
1153static struct usb_driver usb_audio_driver = {
1154 .name = "snd-usb-audio",
1155 .probe = usb_audio_probe,
1156 .disconnect = usb_audio_disconnect,
1157 .suspend = usb_audio_suspend,
1158 .resume = usb_audio_resume,
1159 .reset_resume = usb_audio_resume,
1160 .id_table = usb_audio_ids,
1161 .supports_autosuspend = 1,
1162};
1163
1164module_usb_driver(usb_audio_driver);
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;
85static char *quirk_alias[SNDRV_CARDS];
86
87module_param_array(index, int, NULL, 0444);
88MODULE_PARM_DESC(index, "Index value for the USB audio adapter.");
89module_param_array(id, charp, NULL, 0444);
90MODULE_PARM_DESC(id, "ID string for the USB audio adapter.");
91module_param_array(enable, bool, NULL, 0444);
92MODULE_PARM_DESC(enable, "Enable USB audio adapter.");
93module_param_array(vid, int, NULL, 0444);
94MODULE_PARM_DESC(vid, "Vendor ID for the USB audio device.");
95module_param_array(pid, int, NULL, 0444);
96MODULE_PARM_DESC(pid, "Product ID for the USB audio device.");
97module_param_array(device_setup, int, NULL, 0444);
98MODULE_PARM_DESC(device_setup, "Specific device setup (if needed).");
99module_param(ignore_ctl_error, bool, 0444);
100MODULE_PARM_DESC(ignore_ctl_error,
101 "Ignore errors from USB controller for mixer interfaces.");
102module_param(autoclock, bool, 0444);
103MODULE_PARM_DESC(autoclock, "Enable auto-clock selection for UAC2 devices (default: yes).");
104module_param_array(quirk_alias, charp, NULL, 0444);
105MODULE_PARM_DESC(quirk_alias, "Quirk aliases, e.g. 0123abcd:5678beef.");
106
107/*
108 * we keep the snd_usb_audio_t instances by ourselves for merging
109 * the all interfaces on the same card as one sound device.
110 */
111
112static DEFINE_MUTEX(register_mutex);
113static struct snd_usb_audio *usb_chip[SNDRV_CARDS];
114static struct usb_driver usb_audio_driver;
115
116/*
117 * disconnect streams
118 * called from usb_audio_disconnect()
119 */
120static void snd_usb_stream_disconnect(struct snd_usb_stream *as)
121{
122 int idx;
123 struct snd_usb_substream *subs;
124
125 for (idx = 0; idx < 2; idx++) {
126 subs = &as->substream[idx];
127 if (!subs->num_formats)
128 continue;
129 subs->interface = -1;
130 subs->data_endpoint = NULL;
131 subs->sync_endpoint = NULL;
132 }
133}
134
135static int snd_usb_create_stream(struct snd_usb_audio *chip, int ctrlif, int interface)
136{
137 struct usb_device *dev = chip->dev;
138 struct usb_host_interface *alts;
139 struct usb_interface_descriptor *altsd;
140 struct usb_interface *iface = usb_ifnum_to_if(dev, interface);
141
142 if (!iface) {
143 dev_err(&dev->dev, "%u:%d : does not exist\n",
144 ctrlif, interface);
145 return -EINVAL;
146 }
147
148 alts = &iface->altsetting[0];
149 altsd = get_iface_desc(alts);
150
151 /*
152 * Android with both accessory and audio interfaces enabled gets the
153 * interface numbers wrong.
154 */
155 if ((chip->usb_id == USB_ID(0x18d1, 0x2d04) ||
156 chip->usb_id == USB_ID(0x18d1, 0x2d05)) &&
157 interface == 0 &&
158 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
159 altsd->bInterfaceSubClass == USB_SUBCLASS_VENDOR_SPEC) {
160 interface = 2;
161 iface = usb_ifnum_to_if(dev, interface);
162 if (!iface)
163 return -EINVAL;
164 alts = &iface->altsetting[0];
165 altsd = get_iface_desc(alts);
166 }
167
168 if (usb_interface_claimed(iface)) {
169 dev_dbg(&dev->dev, "%d:%d: skipping, already claimed\n",
170 ctrlif, interface);
171 return -EINVAL;
172 }
173
174 if ((altsd->bInterfaceClass == USB_CLASS_AUDIO ||
175 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC) &&
176 altsd->bInterfaceSubClass == USB_SUBCLASS_MIDISTREAMING) {
177 int err = __snd_usbmidi_create(chip->card, iface,
178 &chip->midi_list, NULL,
179 chip->usb_id);
180 if (err < 0) {
181 dev_err(&dev->dev,
182 "%u:%d: cannot create sequencer device\n",
183 ctrlif, interface);
184 return -EINVAL;
185 }
186 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L);
187
188 return 0;
189 }
190
191 if ((altsd->bInterfaceClass != USB_CLASS_AUDIO &&
192 altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
193 altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING) {
194 dev_dbg(&dev->dev,
195 "%u:%d: skipping non-supported interface %d\n",
196 ctrlif, interface, altsd->bInterfaceClass);
197 /* skip non-supported classes */
198 return -EINVAL;
199 }
200
201 if (snd_usb_get_speed(dev) == USB_SPEED_LOW) {
202 dev_err(&dev->dev, "low speed audio streaming not supported\n");
203 return -EINVAL;
204 }
205
206 if (! snd_usb_parse_audio_interface(chip, interface)) {
207 usb_set_interface(dev, interface, 0); /* reset the current interface */
208 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L);
209 }
210
211 return 0;
212}
213
214/*
215 * parse audio control descriptor and create pcm/midi streams
216 */
217static int snd_usb_create_streams(struct snd_usb_audio *chip, int ctrlif)
218{
219 struct usb_device *dev = chip->dev;
220 struct usb_host_interface *host_iface;
221 struct usb_interface_descriptor *altsd;
222 void *control_header;
223 int i, protocol;
224
225 /* find audiocontrol interface */
226 host_iface = &usb_ifnum_to_if(dev, ctrlif)->altsetting[0];
227 control_header = snd_usb_find_csint_desc(host_iface->extra,
228 host_iface->extralen,
229 NULL, UAC_HEADER);
230 altsd = get_iface_desc(host_iface);
231 protocol = altsd->bInterfaceProtocol;
232
233 if (!control_header) {
234 dev_err(&dev->dev, "cannot find UAC_HEADER\n");
235 return -EINVAL;
236 }
237
238 switch (protocol) {
239 default:
240 dev_warn(&dev->dev,
241 "unknown interface protocol %#02x, assuming v1\n",
242 protocol);
243 /* fall through */
244
245 case UAC_VERSION_1: {
246 struct uac1_ac_header_descriptor *h1 = control_header;
247
248 if (!h1->bInCollection) {
249 dev_info(&dev->dev, "skipping empty audio interface (v1)\n");
250 return -EINVAL;
251 }
252
253 if (h1->bLength < sizeof(*h1) + h1->bInCollection) {
254 dev_err(&dev->dev, "invalid UAC_HEADER (v1)\n");
255 return -EINVAL;
256 }
257
258 for (i = 0; i < h1->bInCollection; i++)
259 snd_usb_create_stream(chip, ctrlif, h1->baInterfaceNr[i]);
260
261 break;
262 }
263
264 case UAC_VERSION_2: {
265 struct usb_interface_assoc_descriptor *assoc =
266 usb_ifnum_to_if(dev, ctrlif)->intf_assoc;
267
268 if (!assoc) {
269 /*
270 * Firmware writers cannot count to three. So to find
271 * the IAD on the NuForce UDH-100, also check the next
272 * interface.
273 */
274 struct usb_interface *iface =
275 usb_ifnum_to_if(dev, ctrlif + 1);
276 if (iface &&
277 iface->intf_assoc &&
278 iface->intf_assoc->bFunctionClass == USB_CLASS_AUDIO &&
279 iface->intf_assoc->bFunctionProtocol == UAC_VERSION_2)
280 assoc = iface->intf_assoc;
281 }
282
283 if (!assoc) {
284 dev_err(&dev->dev, "Audio class v2 interfaces need an interface association\n");
285 return -EINVAL;
286 }
287
288 for (i = 0; i < assoc->bInterfaceCount; i++) {
289 int intf = assoc->bFirstInterface + i;
290
291 if (intf != ctrlif)
292 snd_usb_create_stream(chip, ctrlif, intf);
293 }
294
295 break;
296 }
297 }
298
299 return 0;
300}
301
302/*
303 * free the chip instance
304 *
305 * here we have to do not much, since pcm and controls are already freed
306 *
307 */
308
309static int snd_usb_audio_free(struct snd_usb_audio *chip)
310{
311 struct snd_usb_endpoint *ep, *n;
312
313 list_for_each_entry_safe(ep, n, &chip->ep_list, list)
314 snd_usb_endpoint_free(ep);
315
316 mutex_destroy(&chip->mutex);
317 if (!atomic_read(&chip->shutdown))
318 dev_set_drvdata(&chip->dev->dev, NULL);
319 kfree(chip);
320 return 0;
321}
322
323static int snd_usb_audio_dev_free(struct snd_device *device)
324{
325 struct snd_usb_audio *chip = device->device_data;
326 return snd_usb_audio_free(chip);
327}
328
329/*
330 * create a chip instance and set its names.
331 */
332static int snd_usb_audio_create(struct usb_interface *intf,
333 struct usb_device *dev, int idx,
334 const struct snd_usb_audio_quirk *quirk,
335 struct snd_usb_audio **rchip)
336{
337 struct snd_card *card;
338 struct snd_usb_audio *chip;
339 int err, len;
340 char component[14];
341 static struct snd_device_ops ops = {
342 .dev_free = snd_usb_audio_dev_free,
343 };
344
345 *rchip = NULL;
346
347 switch (snd_usb_get_speed(dev)) {
348 case USB_SPEED_LOW:
349 case USB_SPEED_FULL:
350 case USB_SPEED_HIGH:
351 case USB_SPEED_WIRELESS:
352 case USB_SPEED_SUPER:
353 case USB_SPEED_SUPER_PLUS:
354 break;
355 default:
356 dev_err(&dev->dev, "unknown device speed %d\n", snd_usb_get_speed(dev));
357 return -ENXIO;
358 }
359
360 err = snd_card_new(&intf->dev, index[idx], id[idx], THIS_MODULE,
361 0, &card);
362 if (err < 0) {
363 dev_err(&dev->dev, "cannot create card instance %d\n", idx);
364 return err;
365 }
366
367 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
368 if (! chip) {
369 snd_card_free(card);
370 return -ENOMEM;
371 }
372
373 mutex_init(&chip->mutex);
374 init_waitqueue_head(&chip->shutdown_wait);
375 chip->index = idx;
376 chip->dev = dev;
377 chip->card = card;
378 chip->setup = device_setup[idx];
379 chip->autoclock = autoclock;
380 atomic_set(&chip->active, 1); /* avoid autopm during probing */
381 atomic_set(&chip->usage_count, 0);
382 atomic_set(&chip->shutdown, 0);
383
384 chip->usb_id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
385 le16_to_cpu(dev->descriptor.idProduct));
386 INIT_LIST_HEAD(&chip->pcm_list);
387 INIT_LIST_HEAD(&chip->ep_list);
388 INIT_LIST_HEAD(&chip->midi_list);
389 INIT_LIST_HEAD(&chip->mixer_list);
390
391 if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) {
392 snd_usb_audio_free(chip);
393 snd_card_free(card);
394 return err;
395 }
396
397 strcpy(card->driver, "USB-Audio");
398 sprintf(component, "USB%04x:%04x",
399 USB_ID_VENDOR(chip->usb_id), USB_ID_PRODUCT(chip->usb_id));
400 snd_component_add(card, component);
401
402 /* retrieve the device string as shortname */
403 if (quirk && quirk->product_name && *quirk->product_name) {
404 strlcpy(card->shortname, quirk->product_name, sizeof(card->shortname));
405 } else {
406 if (!dev->descriptor.iProduct ||
407 usb_string(dev, dev->descriptor.iProduct,
408 card->shortname, sizeof(card->shortname)) <= 0) {
409 /* no name available from anywhere, so use ID */
410 sprintf(card->shortname, "USB Device %#04x:%#04x",
411 USB_ID_VENDOR(chip->usb_id),
412 USB_ID_PRODUCT(chip->usb_id));
413 }
414 }
415 strim(card->shortname);
416
417 /* retrieve the vendor and device strings as longname */
418 if (quirk && quirk->vendor_name && *quirk->vendor_name) {
419 len = strlcpy(card->longname, quirk->vendor_name, sizeof(card->longname));
420 } else {
421 if (dev->descriptor.iManufacturer)
422 len = usb_string(dev, dev->descriptor.iManufacturer,
423 card->longname, sizeof(card->longname));
424 else
425 len = 0;
426 /* we don't really care if there isn't any vendor string */
427 }
428 if (len > 0) {
429 strim(card->longname);
430 if (*card->longname)
431 strlcat(card->longname, " ", sizeof(card->longname));
432 }
433
434 strlcat(card->longname, card->shortname, sizeof(card->longname));
435
436 len = strlcat(card->longname, " at ", sizeof(card->longname));
437
438 if (len < sizeof(card->longname))
439 usb_make_path(dev, card->longname + len, sizeof(card->longname) - len);
440
441 switch (snd_usb_get_speed(dev)) {
442 case USB_SPEED_LOW:
443 strlcat(card->longname, ", low speed", sizeof(card->longname));
444 break;
445 case USB_SPEED_FULL:
446 strlcat(card->longname, ", full speed", sizeof(card->longname));
447 break;
448 case USB_SPEED_HIGH:
449 strlcat(card->longname, ", high speed", sizeof(card->longname));
450 break;
451 case USB_SPEED_SUPER:
452 strlcat(card->longname, ", super speed", sizeof(card->longname));
453 break;
454 case USB_SPEED_SUPER_PLUS:
455 strlcat(card->longname, ", super speed plus", sizeof(card->longname));
456 break;
457 default:
458 break;
459 }
460
461 snd_usb_audio_create_proc(chip);
462
463 *rchip = chip;
464 return 0;
465}
466
467/* look for a matching quirk alias id */
468static bool get_alias_id(struct usb_device *dev, unsigned int *id)
469{
470 int i;
471 unsigned int src, dst;
472
473 for (i = 0; i < ARRAY_SIZE(quirk_alias); i++) {
474 if (!quirk_alias[i] ||
475 sscanf(quirk_alias[i], "%x:%x", &src, &dst) != 2 ||
476 src != *id)
477 continue;
478 dev_info(&dev->dev,
479 "device (%04x:%04x): applying quirk alias %04x:%04x\n",
480 USB_ID_VENDOR(*id), USB_ID_PRODUCT(*id),
481 USB_ID_VENDOR(dst), USB_ID_PRODUCT(dst));
482 *id = dst;
483 return true;
484 }
485
486 return false;
487}
488
489static struct usb_device_id usb_audio_ids[]; /* defined below */
490
491/* look for the corresponding quirk */
492static const struct snd_usb_audio_quirk *
493get_alias_quirk(struct usb_device *dev, unsigned int id)
494{
495 const struct usb_device_id *p;
496
497 for (p = usb_audio_ids; p->match_flags; p++) {
498 /* FIXME: this checks only vendor:product pair in the list */
499 if ((p->match_flags & USB_DEVICE_ID_MATCH_DEVICE) ==
500 USB_DEVICE_ID_MATCH_DEVICE &&
501 p->idVendor == USB_ID_VENDOR(id) &&
502 p->idProduct == USB_ID_PRODUCT(id))
503 return (const struct snd_usb_audio_quirk *)p->driver_info;
504 }
505
506 return NULL;
507}
508
509/*
510 * probe the active usb device
511 *
512 * note that this can be called multiple times per a device, when it
513 * includes multiple audio control interfaces.
514 *
515 * thus we check the usb device pointer and creates the card instance
516 * only at the first time. the successive calls of this function will
517 * append the pcm interface to the corresponding card.
518 */
519static int usb_audio_probe(struct usb_interface *intf,
520 const struct usb_device_id *usb_id)
521{
522 struct usb_device *dev = interface_to_usbdev(intf);
523 const struct snd_usb_audio_quirk *quirk =
524 (const struct snd_usb_audio_quirk *)usb_id->driver_info;
525 struct snd_usb_audio *chip;
526 int i, err;
527 struct usb_host_interface *alts;
528 int ifnum;
529 u32 id;
530
531 alts = &intf->altsetting[0];
532 ifnum = get_iface_desc(alts)->bInterfaceNumber;
533 id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
534 le16_to_cpu(dev->descriptor.idProduct));
535 if (get_alias_id(dev, &id))
536 quirk = get_alias_quirk(dev, id);
537 if (quirk && quirk->ifnum >= 0 && ifnum != quirk->ifnum)
538 return -ENXIO;
539
540 err = snd_usb_apply_boot_quirk(dev, intf, quirk, id);
541 if (err < 0)
542 return err;
543
544 /*
545 * found a config. now register to ALSA
546 */
547
548 /* check whether it's already registered */
549 chip = NULL;
550 mutex_lock(®ister_mutex);
551 for (i = 0; i < SNDRV_CARDS; i++) {
552 if (usb_chip[i] && usb_chip[i]->dev == dev) {
553 if (atomic_read(&usb_chip[i]->shutdown)) {
554 dev_err(&dev->dev, "USB device is in the shutdown state, cannot create a card instance\n");
555 err = -EIO;
556 goto __error;
557 }
558 chip = usb_chip[i];
559 atomic_inc(&chip->active); /* avoid autopm */
560 break;
561 }
562 }
563 if (! chip) {
564 /* it's a fresh one.
565 * now look for an empty slot and create a new card instance
566 */
567 for (i = 0; i < SNDRV_CARDS; i++)
568 if (enable[i] && ! usb_chip[i] &&
569 (vid[i] == -1 || vid[i] == USB_ID_VENDOR(id)) &&
570 (pid[i] == -1 || pid[i] == USB_ID_PRODUCT(id))) {
571 err = snd_usb_audio_create(intf, dev, i, quirk,
572 &chip);
573 if (err < 0)
574 goto __error;
575 chip->pm_intf = intf;
576 break;
577 }
578 if (!chip) {
579 dev_err(&dev->dev, "no available usb audio device\n");
580 err = -ENODEV;
581 goto __error;
582 }
583 }
584 dev_set_drvdata(&dev->dev, chip);
585
586 /*
587 * For devices with more than one control interface, we assume the
588 * first contains the audio controls. We might need a more specific
589 * check here in the future.
590 */
591 if (!chip->ctrl_intf)
592 chip->ctrl_intf = alts;
593
594 chip->txfr_quirk = 0;
595 err = 1; /* continue */
596 if (quirk && quirk->ifnum != QUIRK_NO_INTERFACE) {
597 /* need some special handlings */
598 err = snd_usb_create_quirk(chip, intf, &usb_audio_driver, quirk);
599 if (err < 0)
600 goto __error;
601 }
602
603 if (err > 0) {
604 /* create normal USB audio interfaces */
605 err = snd_usb_create_streams(chip, ifnum);
606 if (err < 0)
607 goto __error;
608 err = snd_usb_create_mixer(chip, ifnum, ignore_ctl_error);
609 if (err < 0)
610 goto __error;
611 }
612
613 /* we are allowed to call snd_card_register() many times */
614 err = snd_card_register(chip->card);
615 if (err < 0)
616 goto __error;
617
618 usb_chip[chip->index] = chip;
619 chip->num_interfaces++;
620 usb_set_intfdata(intf, chip);
621 atomic_dec(&chip->active);
622 mutex_unlock(®ister_mutex);
623 return 0;
624
625 __error:
626 if (chip) {
627 if (!chip->num_interfaces)
628 snd_card_free(chip->card);
629 atomic_dec(&chip->active);
630 }
631 mutex_unlock(®ister_mutex);
632 return err;
633}
634
635/*
636 * we need to take care of counter, since disconnection can be called also
637 * many times as well as usb_audio_probe().
638 */
639static void usb_audio_disconnect(struct usb_interface *intf)
640{
641 struct snd_usb_audio *chip = usb_get_intfdata(intf);
642 struct snd_card *card;
643 struct list_head *p;
644
645 if (chip == (void *)-1L)
646 return;
647
648 card = chip->card;
649
650 mutex_lock(®ister_mutex);
651 if (atomic_inc_return(&chip->shutdown) == 1) {
652 struct snd_usb_stream *as;
653 struct snd_usb_endpoint *ep;
654 struct usb_mixer_interface *mixer;
655
656 /* wait until all pending tasks done;
657 * they are protected by snd_usb_lock_shutdown()
658 */
659 wait_event(chip->shutdown_wait,
660 !atomic_read(&chip->usage_count));
661 snd_card_disconnect(card);
662 /* release the pcm resources */
663 list_for_each_entry(as, &chip->pcm_list, list) {
664 snd_usb_stream_disconnect(as);
665 }
666 /* release the endpoint resources */
667 list_for_each_entry(ep, &chip->ep_list, list) {
668 snd_usb_endpoint_release(ep);
669 }
670 /* release the midi resources */
671 list_for_each(p, &chip->midi_list) {
672 snd_usbmidi_disconnect(p);
673 }
674 /* release mixer resources */
675 list_for_each_entry(mixer, &chip->mixer_list, list) {
676 snd_usb_mixer_disconnect(mixer);
677 }
678 }
679
680 chip->num_interfaces--;
681 if (chip->num_interfaces <= 0) {
682 usb_chip[chip->index] = NULL;
683 mutex_unlock(®ister_mutex);
684 snd_card_free_when_closed(card);
685 } else {
686 mutex_unlock(®ister_mutex);
687 }
688}
689
690/* lock the shutdown (disconnect) task and autoresume */
691int snd_usb_lock_shutdown(struct snd_usb_audio *chip)
692{
693 int err;
694
695 atomic_inc(&chip->usage_count);
696 if (atomic_read(&chip->shutdown)) {
697 err = -EIO;
698 goto error;
699 }
700 err = snd_usb_autoresume(chip);
701 if (err < 0)
702 goto error;
703 return 0;
704
705 error:
706 if (atomic_dec_and_test(&chip->usage_count))
707 wake_up(&chip->shutdown_wait);
708 return err;
709}
710
711/* autosuspend and unlock the shutdown */
712void snd_usb_unlock_shutdown(struct snd_usb_audio *chip)
713{
714 snd_usb_autosuspend(chip);
715 if (atomic_dec_and_test(&chip->usage_count))
716 wake_up(&chip->shutdown_wait);
717}
718
719#ifdef CONFIG_PM
720
721int snd_usb_autoresume(struct snd_usb_audio *chip)
722{
723 if (atomic_read(&chip->shutdown))
724 return -EIO;
725 if (atomic_inc_return(&chip->active) == 1)
726 return usb_autopm_get_interface(chip->pm_intf);
727 return 0;
728}
729
730void snd_usb_autosuspend(struct snd_usb_audio *chip)
731{
732 if (atomic_read(&chip->shutdown))
733 return;
734 if (atomic_dec_and_test(&chip->active))
735 usb_autopm_put_interface(chip->pm_intf);
736}
737
738static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message)
739{
740 struct snd_usb_audio *chip = usb_get_intfdata(intf);
741 struct snd_usb_stream *as;
742 struct usb_mixer_interface *mixer;
743 struct list_head *p;
744
745 if (chip == (void *)-1L)
746 return 0;
747
748 chip->autosuspended = !!PMSG_IS_AUTO(message);
749 if (!chip->autosuspended)
750 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot);
751 if (!chip->num_suspended_intf++) {
752 list_for_each_entry(as, &chip->pcm_list, list) {
753 snd_pcm_suspend_all(as->pcm);
754 as->substream[0].need_setup_ep =
755 as->substream[1].need_setup_ep = true;
756 }
757 list_for_each(p, &chip->midi_list)
758 snd_usbmidi_suspend(p);
759 list_for_each_entry(mixer, &chip->mixer_list, list)
760 snd_usb_mixer_suspend(mixer);
761 }
762
763 return 0;
764}
765
766static int __usb_audio_resume(struct usb_interface *intf, bool reset_resume)
767{
768 struct snd_usb_audio *chip = usb_get_intfdata(intf);
769 struct usb_mixer_interface *mixer;
770 struct list_head *p;
771 int err = 0;
772
773 if (chip == (void *)-1L)
774 return 0;
775 if (--chip->num_suspended_intf)
776 return 0;
777
778 atomic_inc(&chip->active); /* avoid autopm */
779 /*
780 * ALSA leaves material resumption to user space
781 * we just notify and restart the mixers
782 */
783 list_for_each_entry(mixer, &chip->mixer_list, list) {
784 err = snd_usb_mixer_resume(mixer, reset_resume);
785 if (err < 0)
786 goto err_out;
787 }
788
789 list_for_each(p, &chip->midi_list) {
790 snd_usbmidi_resume(p);
791 }
792
793 if (!chip->autosuspended)
794 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0);
795 chip->autosuspended = 0;
796
797err_out:
798 atomic_dec(&chip->active); /* allow autopm after this point */
799 return err;
800}
801
802static int usb_audio_resume(struct usb_interface *intf)
803{
804 return __usb_audio_resume(intf, false);
805}
806
807static int usb_audio_reset_resume(struct usb_interface *intf)
808{
809 return __usb_audio_resume(intf, true);
810}
811#else
812#define usb_audio_suspend NULL
813#define usb_audio_resume NULL
814#define usb_audio_reset_resume NULL
815#endif /* CONFIG_PM */
816
817static struct usb_device_id usb_audio_ids [] = {
818#include "quirks-table.h"
819 { .match_flags = (USB_DEVICE_ID_MATCH_INT_CLASS | USB_DEVICE_ID_MATCH_INT_SUBCLASS),
820 .bInterfaceClass = USB_CLASS_AUDIO,
821 .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL },
822 { } /* Terminating entry */
823};
824MODULE_DEVICE_TABLE(usb, usb_audio_ids);
825
826/*
827 * entry point for linux usb interface
828 */
829
830static struct usb_driver usb_audio_driver = {
831 .name = "snd-usb-audio",
832 .probe = usb_audio_probe,
833 .disconnect = usb_audio_disconnect,
834 .suspend = usb_audio_suspend,
835 .resume = usb_audio_resume,
836 .reset_resume = usb_audio_reset_resume,
837 .id_table = usb_audio_ids,
838 .supports_autosuspend = 1,
839};
840
841module_usb_driver(usb_audio_driver);