Loading...
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 "midi2.h"
48#include "mixer.h"
49#include "proc.h"
50#include "quirks.h"
51#include "endpoint.h"
52#include "helper.h"
53#include "pcm.h"
54#include "format.h"
55#include "power.h"
56#include "stream.h"
57#include "media.h"
58
59MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
60MODULE_DESCRIPTION("USB Audio");
61MODULE_LICENSE("GPL");
62
63static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */
64static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */
65static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;/* Enable this card */
66/* Vendor/product IDs for this card */
67static int vid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 };
68static int pid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 };
69static int device_setup[SNDRV_CARDS]; /* device parameter for this card */
70static bool ignore_ctl_error;
71static bool autoclock = true;
72static bool lowlatency = true;
73static char *quirk_alias[SNDRV_CARDS];
74static char *delayed_register[SNDRV_CARDS];
75static bool implicit_fb[SNDRV_CARDS];
76static unsigned int quirk_flags[SNDRV_CARDS];
77
78bool snd_usb_use_vmalloc = true;
79bool snd_usb_skip_validation;
80
81module_param_array(index, int, NULL, 0444);
82MODULE_PARM_DESC(index, "Index value for the USB audio adapter.");
83module_param_array(id, charp, NULL, 0444);
84MODULE_PARM_DESC(id, "ID string for the USB audio adapter.");
85module_param_array(enable, bool, NULL, 0444);
86MODULE_PARM_DESC(enable, "Enable USB audio adapter.");
87module_param_array(vid, int, NULL, 0444);
88MODULE_PARM_DESC(vid, "Vendor ID for the USB audio device.");
89module_param_array(pid, int, NULL, 0444);
90MODULE_PARM_DESC(pid, "Product ID for the USB audio device.");
91module_param_array(device_setup, int, NULL, 0444);
92MODULE_PARM_DESC(device_setup, "Specific device setup (if needed).");
93module_param(ignore_ctl_error, bool, 0444);
94MODULE_PARM_DESC(ignore_ctl_error,
95 "Ignore errors from USB controller for mixer interfaces.");
96module_param(autoclock, bool, 0444);
97MODULE_PARM_DESC(autoclock, "Enable auto-clock selection for UAC2 devices (default: yes).");
98module_param(lowlatency, bool, 0444);
99MODULE_PARM_DESC(lowlatency, "Enable low latency playback (default: yes).");
100module_param_array(quirk_alias, charp, NULL, 0444);
101MODULE_PARM_DESC(quirk_alias, "Quirk aliases, e.g. 0123abcd:5678beef.");
102module_param_array(delayed_register, charp, NULL, 0444);
103MODULE_PARM_DESC(delayed_register, "Quirk for delayed registration, given by id:iface, e.g. 0123abcd:4.");
104module_param_array(implicit_fb, bool, NULL, 0444);
105MODULE_PARM_DESC(implicit_fb, "Apply generic implicit feedback sync mode.");
106module_param_array(quirk_flags, uint, NULL, 0444);
107MODULE_PARM_DESC(quirk_flags, "Driver quirk bit flags.");
108module_param_named(use_vmalloc, snd_usb_use_vmalloc, bool, 0444);
109MODULE_PARM_DESC(use_vmalloc, "Use vmalloc for PCM intermediate buffers (default: yes).");
110module_param_named(skip_validation, snd_usb_skip_validation, bool, 0444);
111MODULE_PARM_DESC(skip_validation, "Skip unit descriptor validation (default: no).");
112
113/*
114 * we keep the snd_usb_audio_t instances by ourselves for merging
115 * the all interfaces on the same card as one sound device.
116 */
117
118static DEFINE_MUTEX(register_mutex);
119static struct snd_usb_audio *usb_chip[SNDRV_CARDS];
120static struct usb_driver usb_audio_driver;
121
122/*
123 * disconnect streams
124 * called from usb_audio_disconnect()
125 */
126static void snd_usb_stream_disconnect(struct snd_usb_stream *as)
127{
128 int idx;
129 struct snd_usb_substream *subs;
130
131 for (idx = 0; idx < 2; idx++) {
132 subs = &as->substream[idx];
133 if (!subs->num_formats)
134 continue;
135 subs->data_endpoint = NULL;
136 subs->sync_endpoint = NULL;
137 }
138}
139
140static int snd_usb_create_stream(struct snd_usb_audio *chip, int ctrlif, int interface)
141{
142 struct usb_device *dev = chip->dev;
143 struct usb_host_interface *alts;
144 struct usb_interface_descriptor *altsd;
145 struct usb_interface *iface = usb_ifnum_to_if(dev, interface);
146
147 if (!iface) {
148 dev_err(&dev->dev, "%u:%d : does not exist\n",
149 ctrlif, interface);
150 return -EINVAL;
151 }
152
153 alts = &iface->altsetting[0];
154 altsd = get_iface_desc(alts);
155
156 /*
157 * Android with both accessory and audio interfaces enabled gets the
158 * interface numbers wrong.
159 */
160 if ((chip->usb_id == USB_ID(0x18d1, 0x2d04) ||
161 chip->usb_id == USB_ID(0x18d1, 0x2d05)) &&
162 interface == 0 &&
163 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
164 altsd->bInterfaceSubClass == USB_SUBCLASS_VENDOR_SPEC) {
165 interface = 2;
166 iface = usb_ifnum_to_if(dev, interface);
167 if (!iface)
168 return -EINVAL;
169 alts = &iface->altsetting[0];
170 altsd = get_iface_desc(alts);
171 }
172
173 if (usb_interface_claimed(iface)) {
174 dev_dbg(&dev->dev, "%d:%d: skipping, already claimed\n",
175 ctrlif, interface);
176 return -EINVAL;
177 }
178
179 if ((altsd->bInterfaceClass == USB_CLASS_AUDIO ||
180 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC) &&
181 altsd->bInterfaceSubClass == USB_SUBCLASS_MIDISTREAMING) {
182 int err = snd_usb_midi_v2_create(chip, iface, 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 snd_usb_midi_v2_free_all(chip);
489
490 mutex_destroy(&chip->mutex);
491 if (!atomic_read(&chip->shutdown))
492 dev_set_drvdata(&chip->dev->dev, NULL);
493}
494
495static void usb_audio_make_shortname(struct usb_device *dev,
496 struct snd_usb_audio *chip,
497 const struct snd_usb_audio_quirk *quirk)
498{
499 struct snd_card *card = chip->card;
500 const struct usb_audio_device_name *preset;
501 const char *s = NULL;
502
503 preset = lookup_device_name(chip->usb_id);
504 if (preset && preset->product_name)
505 s = preset->product_name;
506 else if (quirk && quirk->product_name)
507 s = quirk->product_name;
508 if (s && *s) {
509 strscpy(card->shortname, s, sizeof(card->shortname));
510 return;
511 }
512
513 /* retrieve the device string as shortname */
514 if (!dev->descriptor.iProduct ||
515 usb_string(dev, dev->descriptor.iProduct,
516 card->shortname, sizeof(card->shortname)) <= 0) {
517 /* no name available from anywhere, so use ID */
518 sprintf(card->shortname, "USB Device %#04x:%#04x",
519 USB_ID_VENDOR(chip->usb_id),
520 USB_ID_PRODUCT(chip->usb_id));
521 }
522
523 strim(card->shortname);
524}
525
526static void usb_audio_make_longname(struct usb_device *dev,
527 struct snd_usb_audio *chip,
528 const struct snd_usb_audio_quirk *quirk)
529{
530 struct snd_card *card = chip->card;
531 const struct usb_audio_device_name *preset;
532 const char *s = NULL;
533 int len;
534
535 preset = lookup_device_name(chip->usb_id);
536
537 /* shortcut - if any pre-defined string is given, use it */
538 if (preset && preset->profile_name)
539 s = preset->profile_name;
540 if (s && *s) {
541 strscpy(card->longname, s, sizeof(card->longname));
542 return;
543 }
544
545 if (preset && preset->vendor_name)
546 s = preset->vendor_name;
547 else if (quirk && quirk->vendor_name)
548 s = quirk->vendor_name;
549 *card->longname = 0;
550 if (s && *s) {
551 strscpy(card->longname, s, sizeof(card->longname));
552 } else {
553 /* retrieve the vendor and device strings as longname */
554 if (dev->descriptor.iManufacturer)
555 usb_string(dev, dev->descriptor.iManufacturer,
556 card->longname, sizeof(card->longname));
557 /* we don't really care if there isn't any vendor string */
558 }
559 if (*card->longname) {
560 strim(card->longname);
561 if (*card->longname)
562 strlcat(card->longname, " ", sizeof(card->longname));
563 }
564
565 strlcat(card->longname, card->shortname, sizeof(card->longname));
566
567 len = strlcat(card->longname, " at ", sizeof(card->longname));
568
569 if (len < sizeof(card->longname))
570 usb_make_path(dev, card->longname + len, sizeof(card->longname) - len);
571
572 switch (snd_usb_get_speed(dev)) {
573 case USB_SPEED_LOW:
574 strlcat(card->longname, ", low speed", sizeof(card->longname));
575 break;
576 case USB_SPEED_FULL:
577 strlcat(card->longname, ", full speed", sizeof(card->longname));
578 break;
579 case USB_SPEED_HIGH:
580 strlcat(card->longname, ", high speed", sizeof(card->longname));
581 break;
582 case USB_SPEED_SUPER:
583 strlcat(card->longname, ", super speed", sizeof(card->longname));
584 break;
585 case USB_SPEED_SUPER_PLUS:
586 strlcat(card->longname, ", super speed plus", sizeof(card->longname));
587 break;
588 default:
589 break;
590 }
591}
592
593/*
594 * create a chip instance and set its names.
595 */
596static int snd_usb_audio_create(struct usb_interface *intf,
597 struct usb_device *dev, int idx,
598 const struct snd_usb_audio_quirk *quirk,
599 unsigned int usb_id,
600 struct snd_usb_audio **rchip)
601{
602 struct snd_card *card;
603 struct snd_usb_audio *chip;
604 int err;
605 char component[14];
606
607 *rchip = NULL;
608
609 switch (snd_usb_get_speed(dev)) {
610 case USB_SPEED_LOW:
611 case USB_SPEED_FULL:
612 case USB_SPEED_HIGH:
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->midi_v2_list);
649 INIT_LIST_HEAD(&chip->mixer_list);
650
651 if (quirk_flags[idx])
652 chip->quirk_flags = quirk_flags[idx];
653 else
654 snd_usb_init_quirk_flags(chip);
655
656 card->private_free = snd_usb_audio_free;
657
658 strcpy(card->driver, "USB-Audio");
659 sprintf(component, "USB%04x:%04x",
660 USB_ID_VENDOR(chip->usb_id), USB_ID_PRODUCT(chip->usb_id));
661 snd_component_add(card, component);
662
663 usb_audio_make_shortname(dev, chip, quirk);
664 usb_audio_make_longname(dev, chip, quirk);
665
666 snd_usb_audio_create_proc(chip);
667
668 *rchip = chip;
669 return 0;
670}
671
672/* look for a matching quirk alias id */
673static bool get_alias_id(struct usb_device *dev, unsigned int *id)
674{
675 int i;
676 unsigned int src, dst;
677
678 for (i = 0; i < ARRAY_SIZE(quirk_alias); i++) {
679 if (!quirk_alias[i] ||
680 sscanf(quirk_alias[i], "%x:%x", &src, &dst) != 2 ||
681 src != *id)
682 continue;
683 dev_info(&dev->dev,
684 "device (%04x:%04x): applying quirk alias %04x:%04x\n",
685 USB_ID_VENDOR(*id), USB_ID_PRODUCT(*id),
686 USB_ID_VENDOR(dst), USB_ID_PRODUCT(dst));
687 *id = dst;
688 return true;
689 }
690
691 return false;
692}
693
694static int check_delayed_register_option(struct snd_usb_audio *chip)
695{
696 int i;
697 unsigned int id, inum;
698
699 for (i = 0; i < ARRAY_SIZE(delayed_register); i++) {
700 if (delayed_register[i] &&
701 sscanf(delayed_register[i], "%x:%x", &id, &inum) == 2 &&
702 id == chip->usb_id)
703 return inum;
704 }
705
706 return -1;
707}
708
709static const struct usb_device_id usb_audio_ids[]; /* defined below */
710
711/* look for the last interface that matches with our ids and remember it */
712static void find_last_interface(struct snd_usb_audio *chip)
713{
714 struct usb_host_config *config = chip->dev->actconfig;
715 struct usb_interface *intf;
716 int i;
717
718 if (!config)
719 return;
720 for (i = 0; i < config->desc.bNumInterfaces; i++) {
721 intf = config->interface[i];
722 if (usb_match_id(intf, usb_audio_ids))
723 chip->last_iface = intf->altsetting[0].desc.bInterfaceNumber;
724 }
725 usb_audio_dbg(chip, "Found last interface = %d\n", chip->last_iface);
726}
727
728/* look for the corresponding quirk */
729static const struct snd_usb_audio_quirk *
730get_alias_quirk(struct usb_device *dev, unsigned int id)
731{
732 const struct usb_device_id *p;
733
734 for (p = usb_audio_ids; p->match_flags; p++) {
735 /* FIXME: this checks only vendor:product pair in the list */
736 if ((p->match_flags & USB_DEVICE_ID_MATCH_DEVICE) ==
737 USB_DEVICE_ID_MATCH_DEVICE &&
738 p->idVendor == USB_ID_VENDOR(id) &&
739 p->idProduct == USB_ID_PRODUCT(id))
740 return (const struct snd_usb_audio_quirk *)p->driver_info;
741 }
742
743 return NULL;
744}
745
746/* register card if we reach to the last interface or to the specified
747 * one given via option
748 */
749static int try_to_register_card(struct snd_usb_audio *chip, int ifnum)
750{
751 if (check_delayed_register_option(chip) == ifnum ||
752 chip->last_iface == ifnum ||
753 usb_interface_claimed(usb_ifnum_to_if(chip->dev, chip->last_iface)))
754 return snd_card_register(chip->card);
755 return 0;
756}
757
758/*
759 * probe the active usb device
760 *
761 * note that this can be called multiple times per a device, when it
762 * includes multiple audio control interfaces.
763 *
764 * thus we check the usb device pointer and creates the card instance
765 * only at the first time. the successive calls of this function will
766 * append the pcm interface to the corresponding card.
767 */
768static int usb_audio_probe(struct usb_interface *intf,
769 const struct usb_device_id *usb_id)
770{
771 struct usb_device *dev = interface_to_usbdev(intf);
772 const struct snd_usb_audio_quirk *quirk =
773 (const struct snd_usb_audio_quirk *)usb_id->driver_info;
774 struct snd_usb_audio *chip;
775 int i, err;
776 struct usb_host_interface *alts;
777 int ifnum;
778 u32 id;
779
780 alts = &intf->altsetting[0];
781 ifnum = get_iface_desc(alts)->bInterfaceNumber;
782 id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
783 le16_to_cpu(dev->descriptor.idProduct));
784 if (get_alias_id(dev, &id))
785 quirk = get_alias_quirk(dev, id);
786 if (quirk && quirk->ifnum >= 0 && ifnum != quirk->ifnum)
787 return -ENXIO;
788 if (quirk && quirk->ifnum == QUIRK_NODEV_INTERFACE)
789 return -ENODEV;
790
791 err = snd_usb_apply_boot_quirk(dev, intf, quirk, id);
792 if (err < 0)
793 return err;
794
795 /*
796 * found a config. now register to ALSA
797 */
798
799 /* check whether it's already registered */
800 chip = NULL;
801 mutex_lock(®ister_mutex);
802 for (i = 0; i < SNDRV_CARDS; i++) {
803 if (usb_chip[i] && usb_chip[i]->dev == dev) {
804 if (atomic_read(&usb_chip[i]->shutdown)) {
805 dev_err(&dev->dev, "USB device is in the shutdown state, cannot create a card instance\n");
806 err = -EIO;
807 goto __error;
808 }
809 chip = usb_chip[i];
810 atomic_inc(&chip->active); /* avoid autopm */
811 break;
812 }
813 }
814 if (! chip) {
815 err = snd_usb_apply_boot_quirk_once(dev, intf, quirk, id);
816 if (err < 0)
817 goto __error;
818
819 /* it's a fresh one.
820 * now look for an empty slot and create a new card instance
821 */
822 for (i = 0; i < SNDRV_CARDS; i++)
823 if (!usb_chip[i] &&
824 (vid[i] == -1 || vid[i] == USB_ID_VENDOR(id)) &&
825 (pid[i] == -1 || pid[i] == USB_ID_PRODUCT(id))) {
826 if (enable[i]) {
827 err = snd_usb_audio_create(intf, dev, i, quirk,
828 id, &chip);
829 if (err < 0)
830 goto __error;
831 break;
832 } else if (vid[i] != -1 || pid[i] != -1) {
833 dev_info(&dev->dev,
834 "device (%04x:%04x) is disabled\n",
835 USB_ID_VENDOR(id),
836 USB_ID_PRODUCT(id));
837 err = -ENOENT;
838 goto __error;
839 }
840 }
841 if (!chip) {
842 dev_err(&dev->dev, "no available usb audio device\n");
843 err = -ENODEV;
844 goto __error;
845 }
846 find_last_interface(chip);
847 }
848
849 if (chip->num_interfaces >= MAX_CARD_INTERFACES) {
850 dev_info(&dev->dev, "Too many interfaces assigned to the single USB-audio card\n");
851 err = -EINVAL;
852 goto __error;
853 }
854
855 dev_set_drvdata(&dev->dev, chip);
856
857 if (ignore_ctl_error)
858 chip->quirk_flags |= QUIRK_FLAG_IGNORE_CTL_ERROR;
859
860 if (chip->quirk_flags & QUIRK_FLAG_DISABLE_AUTOSUSPEND)
861 usb_disable_autosuspend(interface_to_usbdev(intf));
862
863 /*
864 * For devices with more than one control interface, we assume the
865 * first contains the audio controls. We might need a more specific
866 * check here in the future.
867 */
868 if (!chip->ctrl_intf)
869 chip->ctrl_intf = alts;
870
871 err = 1; /* continue */
872 if (quirk && quirk->ifnum != QUIRK_NO_INTERFACE) {
873 /* need some special handlings */
874 err = snd_usb_create_quirk(chip, intf, &usb_audio_driver, quirk);
875 if (err < 0)
876 goto __error;
877 }
878
879 if (err > 0) {
880 /* create normal USB audio interfaces */
881 err = snd_usb_create_streams(chip, ifnum);
882 if (err < 0)
883 goto __error;
884 err = snd_usb_create_mixer(chip, ifnum);
885 if (err < 0)
886 goto __error;
887 }
888
889 if (chip->need_delayed_register) {
890 dev_info(&dev->dev,
891 "Found post-registration device assignment: %08x:%02x\n",
892 chip->usb_id, ifnum);
893 chip->need_delayed_register = false; /* clear again */
894 }
895
896 err = try_to_register_card(chip, ifnum);
897 if (err < 0)
898 goto __error_no_register;
899
900 if (chip->quirk_flags & QUIRK_FLAG_SHARE_MEDIA_DEVICE) {
901 /* don't want to fail when snd_media_device_create() fails */
902 snd_media_device_create(chip, intf);
903 }
904
905 if (quirk)
906 chip->quirk_type = quirk->type;
907
908 usb_chip[chip->index] = chip;
909 chip->intf[chip->num_interfaces] = intf;
910 chip->num_interfaces++;
911 usb_set_intfdata(intf, chip);
912 atomic_dec(&chip->active);
913 mutex_unlock(®ister_mutex);
914 return 0;
915
916 __error:
917 /* in the case of error in secondary interface, still try to register */
918 if (chip)
919 try_to_register_card(chip, ifnum);
920
921 __error_no_register:
922 if (chip) {
923 /* chip->active is inside the chip->card object,
924 * decrement before memory is possibly returned.
925 */
926 atomic_dec(&chip->active);
927 if (!chip->num_interfaces)
928 snd_card_free(chip->card);
929 }
930 mutex_unlock(®ister_mutex);
931 return err;
932}
933
934/*
935 * we need to take care of counter, since disconnection can be called also
936 * many times as well as usb_audio_probe().
937 */
938static void usb_audio_disconnect(struct usb_interface *intf)
939{
940 struct snd_usb_audio *chip = usb_get_intfdata(intf);
941 struct snd_card *card;
942 struct list_head *p;
943
944 if (chip == USB_AUDIO_IFACE_UNUSED)
945 return;
946
947 card = chip->card;
948
949 mutex_lock(®ister_mutex);
950 if (atomic_inc_return(&chip->shutdown) == 1) {
951 struct snd_usb_stream *as;
952 struct snd_usb_endpoint *ep;
953 struct usb_mixer_interface *mixer;
954
955 /* wait until all pending tasks done;
956 * they are protected by snd_usb_lock_shutdown()
957 */
958 wait_event(chip->shutdown_wait,
959 !atomic_read(&chip->usage_count));
960 snd_card_disconnect(card);
961 /* release the pcm resources */
962 list_for_each_entry(as, &chip->pcm_list, list) {
963 snd_usb_stream_disconnect(as);
964 }
965 /* release the endpoint resources */
966 list_for_each_entry(ep, &chip->ep_list, list) {
967 snd_usb_endpoint_release(ep);
968 }
969 /* release the midi resources */
970 list_for_each(p, &chip->midi_list) {
971 snd_usbmidi_disconnect(p);
972 }
973 snd_usb_midi_v2_disconnect_all(chip);
974 /*
975 * Nice to check quirk && quirk->shares_media_device and
976 * then call the snd_media_device_delete(). Don't have
977 * access to the quirk here. snd_media_device_delete()
978 * accesses mixer_list
979 */
980 snd_media_device_delete(chip);
981
982 /* release mixer resources */
983 list_for_each_entry(mixer, &chip->mixer_list, list) {
984 snd_usb_mixer_disconnect(mixer);
985 }
986 }
987
988 if (chip->quirk_flags & QUIRK_FLAG_DISABLE_AUTOSUSPEND)
989 usb_enable_autosuspend(interface_to_usbdev(intf));
990
991 chip->num_interfaces--;
992 if (chip->num_interfaces <= 0) {
993 usb_chip[chip->index] = NULL;
994 mutex_unlock(®ister_mutex);
995 snd_card_free_when_closed(card);
996 } else {
997 mutex_unlock(®ister_mutex);
998 }
999}
1000
1001/* lock the shutdown (disconnect) task and autoresume */
1002int snd_usb_lock_shutdown(struct snd_usb_audio *chip)
1003{
1004 int err;
1005
1006 atomic_inc(&chip->usage_count);
1007 if (atomic_read(&chip->shutdown)) {
1008 err = -EIO;
1009 goto error;
1010 }
1011 err = snd_usb_autoresume(chip);
1012 if (err < 0)
1013 goto error;
1014 return 0;
1015
1016 error:
1017 if (atomic_dec_and_test(&chip->usage_count))
1018 wake_up(&chip->shutdown_wait);
1019 return err;
1020}
1021
1022/* autosuspend and unlock the shutdown */
1023void snd_usb_unlock_shutdown(struct snd_usb_audio *chip)
1024{
1025 snd_usb_autosuspend(chip);
1026 if (atomic_dec_and_test(&chip->usage_count))
1027 wake_up(&chip->shutdown_wait);
1028}
1029
1030int snd_usb_autoresume(struct snd_usb_audio *chip)
1031{
1032 int i, err;
1033
1034 if (atomic_read(&chip->shutdown))
1035 return -EIO;
1036 if (atomic_inc_return(&chip->active) != 1)
1037 return 0;
1038
1039 for (i = 0; i < chip->num_interfaces; i++) {
1040 err = usb_autopm_get_interface(chip->intf[i]);
1041 if (err < 0) {
1042 /* rollback */
1043 while (--i >= 0)
1044 usb_autopm_put_interface(chip->intf[i]);
1045 atomic_dec(&chip->active);
1046 return err;
1047 }
1048 }
1049 return 0;
1050}
1051
1052void snd_usb_autosuspend(struct snd_usb_audio *chip)
1053{
1054 int i;
1055
1056 if (atomic_read(&chip->shutdown))
1057 return;
1058 if (!atomic_dec_and_test(&chip->active))
1059 return;
1060
1061 for (i = 0; i < chip->num_interfaces; i++)
1062 usb_autopm_put_interface(chip->intf[i]);
1063}
1064
1065static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message)
1066{
1067 struct snd_usb_audio *chip = usb_get_intfdata(intf);
1068 struct snd_usb_stream *as;
1069 struct snd_usb_endpoint *ep;
1070 struct usb_mixer_interface *mixer;
1071 struct list_head *p;
1072
1073 if (chip == USB_AUDIO_IFACE_UNUSED)
1074 return 0;
1075
1076 if (!chip->num_suspended_intf++) {
1077 list_for_each_entry(as, &chip->pcm_list, list)
1078 snd_usb_pcm_suspend(as);
1079 list_for_each_entry(ep, &chip->ep_list, list)
1080 snd_usb_endpoint_suspend(ep);
1081 list_for_each(p, &chip->midi_list)
1082 snd_usbmidi_suspend(p);
1083 list_for_each_entry(mixer, &chip->mixer_list, list)
1084 snd_usb_mixer_suspend(mixer);
1085 snd_usb_midi_v2_suspend_all(chip);
1086 }
1087
1088 if (!PMSG_IS_AUTO(message) && !chip->system_suspend) {
1089 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot);
1090 chip->system_suspend = chip->num_suspended_intf;
1091 }
1092
1093 return 0;
1094}
1095
1096static int usb_audio_resume(struct usb_interface *intf)
1097{
1098 struct snd_usb_audio *chip = usb_get_intfdata(intf);
1099 struct snd_usb_stream *as;
1100 struct usb_mixer_interface *mixer;
1101 struct list_head *p;
1102 int err = 0;
1103
1104 if (chip == USB_AUDIO_IFACE_UNUSED)
1105 return 0;
1106
1107 atomic_inc(&chip->active); /* avoid autopm */
1108 if (chip->num_suspended_intf > 1)
1109 goto out;
1110
1111 list_for_each_entry(as, &chip->pcm_list, list) {
1112 err = snd_usb_pcm_resume(as);
1113 if (err < 0)
1114 goto err_out;
1115 }
1116
1117 /*
1118 * ALSA leaves material resumption to user space
1119 * we just notify and restart the mixers
1120 */
1121 list_for_each_entry(mixer, &chip->mixer_list, list) {
1122 err = snd_usb_mixer_resume(mixer);
1123 if (err < 0)
1124 goto err_out;
1125 }
1126
1127 list_for_each(p, &chip->midi_list) {
1128 snd_usbmidi_resume(p);
1129 }
1130
1131 snd_usb_midi_v2_resume_all(chip);
1132
1133 out:
1134 if (chip->num_suspended_intf == chip->system_suspend) {
1135 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0);
1136 chip->system_suspend = 0;
1137 }
1138 chip->num_suspended_intf--;
1139
1140err_out:
1141 atomic_dec(&chip->active); /* allow autopm after this point */
1142 return err;
1143}
1144
1145static const struct usb_device_id usb_audio_ids [] = {
1146#include "quirks-table.h"
1147 { .match_flags = (USB_DEVICE_ID_MATCH_INT_CLASS | USB_DEVICE_ID_MATCH_INT_SUBCLASS),
1148 .bInterfaceClass = USB_CLASS_AUDIO,
1149 .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL },
1150 { } /* Terminating entry */
1151};
1152MODULE_DEVICE_TABLE(usb, usb_audio_ids);
1153
1154/*
1155 * entry point for linux usb interface
1156 */
1157
1158static struct usb_driver usb_audio_driver = {
1159 .name = "snd-usb-audio",
1160 .probe = usb_audio_probe,
1161 .disconnect = usb_audio_disconnect,
1162 .suspend = usb_audio_suspend,
1163 .resume = usb_audio_resume,
1164 .reset_resume = usb_audio_resume,
1165 .id_table = usb_audio_ids,
1166 .supports_autosuspend = 1,
1167};
1168
1169module_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 * Audio Class 3.0 support by Ruslan Bilovol <ruslan.bilovol@gmail.com>
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 *
26 *
27 * NOTES:
28 *
29 * - the linked URBs would be preferred but not used so far because of
30 * the instability of unlinking.
31 * - type II is not supported properly. there is no device which supports
32 * this type *correctly*. SB extigy looks as if it supports, but it's
33 * indeed an AC3 stream packed in SPDIF frames (i.e. no real AC3 stream).
34 */
35
36
37#include <linux/bitops.h>
38#include <linux/init.h>
39#include <linux/list.h>
40#include <linux/slab.h>
41#include <linux/string.h>
42#include <linux/ctype.h>
43#include <linux/usb.h>
44#include <linux/moduleparam.h>
45#include <linux/mutex.h>
46#include <linux/usb/audio.h>
47#include <linux/usb/audio-v2.h>
48#include <linux/usb/audio-v3.h>
49#include <linux/module.h>
50
51#include <sound/control.h>
52#include <sound/core.h>
53#include <sound/info.h>
54#include <sound/pcm.h>
55#include <sound/pcm_params.h>
56#include <sound/initval.h>
57
58#include "usbaudio.h"
59#include "card.h"
60#include "midi.h"
61#include "mixer.h"
62#include "proc.h"
63#include "quirks.h"
64#include "endpoint.h"
65#include "helper.h"
66#include "debug.h"
67#include "pcm.h"
68#include "format.h"
69#include "power.h"
70#include "stream.h"
71
72MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
73MODULE_DESCRIPTION("USB Audio");
74MODULE_LICENSE("GPL");
75MODULE_SUPPORTED_DEVICE("{{Generic,USB Audio}}");
76
77
78static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */
79static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */
80static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;/* Enable this card */
81/* Vendor/product IDs for this card */
82static int vid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 };
83static int pid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 };
84static int device_setup[SNDRV_CARDS]; /* device parameter for this card */
85static bool ignore_ctl_error;
86static bool autoclock = true;
87static char *quirk_alias[SNDRV_CARDS];
88
89module_param_array(index, int, NULL, 0444);
90MODULE_PARM_DESC(index, "Index value for the USB audio adapter.");
91module_param_array(id, charp, NULL, 0444);
92MODULE_PARM_DESC(id, "ID string for the USB audio adapter.");
93module_param_array(enable, bool, NULL, 0444);
94MODULE_PARM_DESC(enable, "Enable USB audio adapter.");
95module_param_array(vid, int, NULL, 0444);
96MODULE_PARM_DESC(vid, "Vendor ID for the USB audio device.");
97module_param_array(pid, int, NULL, 0444);
98MODULE_PARM_DESC(pid, "Product ID for the USB audio device.");
99module_param_array(device_setup, int, NULL, 0444);
100MODULE_PARM_DESC(device_setup, "Specific device setup (if needed).");
101module_param(ignore_ctl_error, bool, 0444);
102MODULE_PARM_DESC(ignore_ctl_error,
103 "Ignore errors from USB controller for mixer interfaces.");
104module_param(autoclock, bool, 0444);
105MODULE_PARM_DESC(autoclock, "Enable auto-clock selection for UAC2 devices (default: yes).");
106module_param_array(quirk_alias, charp, NULL, 0444);
107MODULE_PARM_DESC(quirk_alias, "Quirk aliases, e.g. 0123abcd:5678beef.");
108
109/*
110 * we keep the snd_usb_audio_t instances by ourselves for merging
111 * the all interfaces on the same card as one sound device.
112 */
113
114static DEFINE_MUTEX(register_mutex);
115static struct snd_usb_audio *usb_chip[SNDRV_CARDS];
116static struct usb_driver usb_audio_driver;
117
118/*
119 * disconnect streams
120 * called from usb_audio_disconnect()
121 */
122static void snd_usb_stream_disconnect(struct snd_usb_stream *as)
123{
124 int idx;
125 struct snd_usb_substream *subs;
126
127 for (idx = 0; idx < 2; idx++) {
128 subs = &as->substream[idx];
129 if (!subs->num_formats)
130 continue;
131 subs->interface = -1;
132 subs->data_endpoint = NULL;
133 subs->sync_endpoint = NULL;
134 }
135}
136
137static int snd_usb_create_stream(struct snd_usb_audio *chip, int ctrlif, int interface)
138{
139 struct usb_device *dev = chip->dev;
140 struct usb_host_interface *alts;
141 struct usb_interface_descriptor *altsd;
142 struct usb_interface *iface = usb_ifnum_to_if(dev, interface);
143
144 if (!iface) {
145 dev_err(&dev->dev, "%u:%d : does not exist\n",
146 ctrlif, interface);
147 return -EINVAL;
148 }
149
150 alts = &iface->altsetting[0];
151 altsd = get_iface_desc(alts);
152
153 /*
154 * Android with both accessory and audio interfaces enabled gets the
155 * interface numbers wrong.
156 */
157 if ((chip->usb_id == USB_ID(0x18d1, 0x2d04) ||
158 chip->usb_id == USB_ID(0x18d1, 0x2d05)) &&
159 interface == 0 &&
160 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
161 altsd->bInterfaceSubClass == USB_SUBCLASS_VENDOR_SPEC) {
162 interface = 2;
163 iface = usb_ifnum_to_if(dev, interface);
164 if (!iface)
165 return -EINVAL;
166 alts = &iface->altsetting[0];
167 altsd = get_iface_desc(alts);
168 }
169
170 if (usb_interface_claimed(iface)) {
171 dev_dbg(&dev->dev, "%d:%d: skipping, already claimed\n",
172 ctrlif, interface);
173 return -EINVAL;
174 }
175
176 if ((altsd->bInterfaceClass == USB_CLASS_AUDIO ||
177 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC) &&
178 altsd->bInterfaceSubClass == USB_SUBCLASS_MIDISTREAMING) {
179 int err = __snd_usbmidi_create(chip->card, iface,
180 &chip->midi_list, NULL,
181 chip->usb_id);
182 if (err < 0) {
183 dev_err(&dev->dev,
184 "%u:%d: cannot create sequencer device\n",
185 ctrlif, interface);
186 return -EINVAL;
187 }
188 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L);
189
190 return 0;
191 }
192
193 if ((altsd->bInterfaceClass != USB_CLASS_AUDIO &&
194 altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
195 altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING) {
196 dev_dbg(&dev->dev,
197 "%u:%d: skipping non-supported interface %d\n",
198 ctrlif, interface, altsd->bInterfaceClass);
199 /* skip non-supported classes */
200 return -EINVAL;
201 }
202
203 if (snd_usb_get_speed(dev) == USB_SPEED_LOW) {
204 dev_err(&dev->dev, "low speed audio streaming not supported\n");
205 return -EINVAL;
206 }
207
208 if (! snd_usb_parse_audio_interface(chip, interface)) {
209 usb_set_interface(dev, interface, 0); /* reset the current interface */
210 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L);
211 }
212
213 return 0;
214}
215
216/*
217 * parse audio control descriptor and create pcm/midi streams
218 */
219static int snd_usb_create_streams(struct snd_usb_audio *chip, int ctrlif)
220{
221 struct usb_device *dev = chip->dev;
222 struct usb_host_interface *host_iface;
223 struct usb_interface_descriptor *altsd;
224 void *control_header;
225 int i, protocol;
226 int rest_bytes;
227
228 /* find audiocontrol interface */
229 host_iface = &usb_ifnum_to_if(dev, ctrlif)->altsetting[0];
230 control_header = snd_usb_find_csint_desc(host_iface->extra,
231 host_iface->extralen,
232 NULL, UAC_HEADER);
233 altsd = get_iface_desc(host_iface);
234 protocol = altsd->bInterfaceProtocol;
235
236 if (!control_header) {
237 dev_err(&dev->dev, "cannot find UAC_HEADER\n");
238 return -EINVAL;
239 }
240
241 rest_bytes = (void *)(host_iface->extra + host_iface->extralen) -
242 control_header;
243
244 /* just to be sure -- this shouldn't hit at all */
245 if (rest_bytes <= 0) {
246 dev_err(&dev->dev, "invalid control header\n");
247 return -EINVAL;
248 }
249
250 switch (protocol) {
251 default:
252 dev_warn(&dev->dev,
253 "unknown interface protocol %#02x, assuming v1\n",
254 protocol);
255 /* fall through */
256
257 case UAC_VERSION_1: {
258 struct uac1_ac_header_descriptor *h1 = control_header;
259
260 if (rest_bytes < sizeof(*h1)) {
261 dev_err(&dev->dev, "too short v1 buffer descriptor\n");
262 return -EINVAL;
263 }
264
265 if (!h1->bInCollection) {
266 dev_info(&dev->dev, "skipping empty audio interface (v1)\n");
267 return -EINVAL;
268 }
269
270 if (rest_bytes < h1->bLength) {
271 dev_err(&dev->dev, "invalid buffer length (v1)\n");
272 return -EINVAL;
273 }
274
275 if (h1->bLength < sizeof(*h1) + h1->bInCollection) {
276 dev_err(&dev->dev, "invalid UAC_HEADER (v1)\n");
277 return -EINVAL;
278 }
279
280 for (i = 0; i < h1->bInCollection; i++)
281 snd_usb_create_stream(chip, ctrlif, h1->baInterfaceNr[i]);
282
283 break;
284 }
285
286 case UAC_VERSION_2:
287 case UAC_VERSION_3: {
288 struct usb_interface_assoc_descriptor *assoc =
289 usb_ifnum_to_if(dev, ctrlif)->intf_assoc;
290
291 if (!assoc) {
292 /*
293 * Firmware writers cannot count to three. So to find
294 * the IAD on the NuForce UDH-100, also check the next
295 * interface.
296 */
297 struct usb_interface *iface =
298 usb_ifnum_to_if(dev, ctrlif + 1);
299 if (iface &&
300 iface->intf_assoc &&
301 iface->intf_assoc->bFunctionClass == USB_CLASS_AUDIO &&
302 iface->intf_assoc->bFunctionProtocol == UAC_VERSION_2)
303 assoc = iface->intf_assoc;
304 }
305
306 if (!assoc) {
307 dev_err(&dev->dev, "Audio class v2/v3 interfaces need an interface association\n");
308 return -EINVAL;
309 }
310
311 for (i = 0; i < assoc->bInterfaceCount; i++) {
312 int intf = assoc->bFirstInterface + i;
313
314 if (intf != ctrlif)
315 snd_usb_create_stream(chip, ctrlif, intf);
316 }
317
318 break;
319 }
320 }
321
322 return 0;
323}
324
325/*
326 * free the chip instance
327 *
328 * here we have to do not much, since pcm and controls are already freed
329 *
330 */
331
332static int snd_usb_audio_free(struct snd_usb_audio *chip)
333{
334 struct snd_usb_endpoint *ep, *n;
335
336 list_for_each_entry_safe(ep, n, &chip->ep_list, list)
337 snd_usb_endpoint_free(ep);
338
339 mutex_destroy(&chip->mutex);
340 if (!atomic_read(&chip->shutdown))
341 dev_set_drvdata(&chip->dev->dev, NULL);
342 kfree(chip);
343 return 0;
344}
345
346static int snd_usb_audio_dev_free(struct snd_device *device)
347{
348 struct snd_usb_audio *chip = device->device_data;
349 return snd_usb_audio_free(chip);
350}
351
352/*
353 * create a chip instance and set its names.
354 */
355static int snd_usb_audio_create(struct usb_interface *intf,
356 struct usb_device *dev, int idx,
357 const struct snd_usb_audio_quirk *quirk,
358 unsigned int usb_id,
359 struct snd_usb_audio **rchip)
360{
361 struct snd_card *card;
362 struct snd_usb_audio *chip;
363 int err, len;
364 char component[14];
365 static struct snd_device_ops ops = {
366 .dev_free = snd_usb_audio_dev_free,
367 };
368
369 *rchip = NULL;
370
371 switch (snd_usb_get_speed(dev)) {
372 case USB_SPEED_LOW:
373 case USB_SPEED_FULL:
374 case USB_SPEED_HIGH:
375 case USB_SPEED_WIRELESS:
376 case USB_SPEED_SUPER:
377 case USB_SPEED_SUPER_PLUS:
378 break;
379 default:
380 dev_err(&dev->dev, "unknown device speed %d\n", snd_usb_get_speed(dev));
381 return -ENXIO;
382 }
383
384 err = snd_card_new(&intf->dev, index[idx], id[idx], THIS_MODULE,
385 0, &card);
386 if (err < 0) {
387 dev_err(&dev->dev, "cannot create card instance %d\n", idx);
388 return err;
389 }
390
391 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
392 if (! chip) {
393 snd_card_free(card);
394 return -ENOMEM;
395 }
396
397 mutex_init(&chip->mutex);
398 init_waitqueue_head(&chip->shutdown_wait);
399 chip->index = idx;
400 chip->dev = dev;
401 chip->card = card;
402 chip->setup = device_setup[idx];
403 chip->autoclock = autoclock;
404 atomic_set(&chip->active, 1); /* avoid autopm during probing */
405 atomic_set(&chip->usage_count, 0);
406 atomic_set(&chip->shutdown, 0);
407
408 chip->usb_id = usb_id;
409 INIT_LIST_HEAD(&chip->pcm_list);
410 INIT_LIST_HEAD(&chip->ep_list);
411 INIT_LIST_HEAD(&chip->midi_list);
412 INIT_LIST_HEAD(&chip->mixer_list);
413
414 if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) {
415 snd_usb_audio_free(chip);
416 snd_card_free(card);
417 return err;
418 }
419
420 strcpy(card->driver, "USB-Audio");
421 sprintf(component, "USB%04x:%04x",
422 USB_ID_VENDOR(chip->usb_id), USB_ID_PRODUCT(chip->usb_id));
423 snd_component_add(card, component);
424
425 /* retrieve the device string as shortname */
426 if (quirk && quirk->product_name && *quirk->product_name) {
427 strlcpy(card->shortname, quirk->product_name, sizeof(card->shortname));
428 } else {
429 if (!dev->descriptor.iProduct ||
430 usb_string(dev, dev->descriptor.iProduct,
431 card->shortname, sizeof(card->shortname)) <= 0) {
432 /* no name available from anywhere, so use ID */
433 sprintf(card->shortname, "USB Device %#04x:%#04x",
434 USB_ID_VENDOR(chip->usb_id),
435 USB_ID_PRODUCT(chip->usb_id));
436 }
437 }
438 strim(card->shortname);
439
440 /* retrieve the vendor and device strings as longname */
441 if (quirk && quirk->vendor_name && *quirk->vendor_name) {
442 len = strlcpy(card->longname, quirk->vendor_name, sizeof(card->longname));
443 } else {
444 if (dev->descriptor.iManufacturer)
445 len = usb_string(dev, dev->descriptor.iManufacturer,
446 card->longname, sizeof(card->longname));
447 else
448 len = 0;
449 /* we don't really care if there isn't any vendor string */
450 }
451 if (len > 0) {
452 strim(card->longname);
453 if (*card->longname)
454 strlcat(card->longname, " ", sizeof(card->longname));
455 }
456
457 strlcat(card->longname, card->shortname, sizeof(card->longname));
458
459 len = strlcat(card->longname, " at ", sizeof(card->longname));
460
461 if (len < sizeof(card->longname))
462 usb_make_path(dev, card->longname + len, sizeof(card->longname) - len);
463
464 switch (snd_usb_get_speed(dev)) {
465 case USB_SPEED_LOW:
466 strlcat(card->longname, ", low speed", sizeof(card->longname));
467 break;
468 case USB_SPEED_FULL:
469 strlcat(card->longname, ", full speed", sizeof(card->longname));
470 break;
471 case USB_SPEED_HIGH:
472 strlcat(card->longname, ", high speed", sizeof(card->longname));
473 break;
474 case USB_SPEED_SUPER:
475 strlcat(card->longname, ", super speed", sizeof(card->longname));
476 break;
477 case USB_SPEED_SUPER_PLUS:
478 strlcat(card->longname, ", super speed plus", sizeof(card->longname));
479 break;
480 default:
481 break;
482 }
483
484 snd_usb_audio_create_proc(chip);
485
486 *rchip = chip;
487 return 0;
488}
489
490/* look for a matching quirk alias id */
491static bool get_alias_id(struct usb_device *dev, unsigned int *id)
492{
493 int i;
494 unsigned int src, dst;
495
496 for (i = 0; i < ARRAY_SIZE(quirk_alias); i++) {
497 if (!quirk_alias[i] ||
498 sscanf(quirk_alias[i], "%x:%x", &src, &dst) != 2 ||
499 src != *id)
500 continue;
501 dev_info(&dev->dev,
502 "device (%04x:%04x): applying quirk alias %04x:%04x\n",
503 USB_ID_VENDOR(*id), USB_ID_PRODUCT(*id),
504 USB_ID_VENDOR(dst), USB_ID_PRODUCT(dst));
505 *id = dst;
506 return true;
507 }
508
509 return false;
510}
511
512static const struct usb_device_id usb_audio_ids[]; /* defined below */
513
514/* look for the corresponding quirk */
515static const struct snd_usb_audio_quirk *
516get_alias_quirk(struct usb_device *dev, unsigned int id)
517{
518 const struct usb_device_id *p;
519
520 for (p = usb_audio_ids; p->match_flags; p++) {
521 /* FIXME: this checks only vendor:product pair in the list */
522 if ((p->match_flags & USB_DEVICE_ID_MATCH_DEVICE) ==
523 USB_DEVICE_ID_MATCH_DEVICE &&
524 p->idVendor == USB_ID_VENDOR(id) &&
525 p->idProduct == USB_ID_PRODUCT(id))
526 return (const struct snd_usb_audio_quirk *)p->driver_info;
527 }
528
529 return NULL;
530}
531
532/*
533 * probe the active usb device
534 *
535 * note that this can be called multiple times per a device, when it
536 * includes multiple audio control interfaces.
537 *
538 * thus we check the usb device pointer and creates the card instance
539 * only at the first time. the successive calls of this function will
540 * append the pcm interface to the corresponding card.
541 */
542static int usb_audio_probe(struct usb_interface *intf,
543 const struct usb_device_id *usb_id)
544{
545 struct usb_device *dev = interface_to_usbdev(intf);
546 const struct snd_usb_audio_quirk *quirk =
547 (const struct snd_usb_audio_quirk *)usb_id->driver_info;
548 struct snd_usb_audio *chip;
549 int i, err;
550 struct usb_host_interface *alts;
551 int ifnum;
552 u32 id;
553
554 alts = &intf->altsetting[0];
555 ifnum = get_iface_desc(alts)->bInterfaceNumber;
556 id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
557 le16_to_cpu(dev->descriptor.idProduct));
558 if (get_alias_id(dev, &id))
559 quirk = get_alias_quirk(dev, id);
560 if (quirk && quirk->ifnum >= 0 && ifnum != quirk->ifnum)
561 return -ENXIO;
562
563 err = snd_usb_apply_boot_quirk(dev, intf, quirk, id);
564 if (err < 0)
565 return err;
566
567 /*
568 * found a config. now register to ALSA
569 */
570
571 /* check whether it's already registered */
572 chip = NULL;
573 mutex_lock(®ister_mutex);
574 for (i = 0; i < SNDRV_CARDS; i++) {
575 if (usb_chip[i] && usb_chip[i]->dev == dev) {
576 if (atomic_read(&usb_chip[i]->shutdown)) {
577 dev_err(&dev->dev, "USB device is in the shutdown state, cannot create a card instance\n");
578 err = -EIO;
579 goto __error;
580 }
581 chip = usb_chip[i];
582 atomic_inc(&chip->active); /* avoid autopm */
583 break;
584 }
585 }
586 if (! chip) {
587 /* it's a fresh one.
588 * now look for an empty slot and create a new card instance
589 */
590 for (i = 0; i < SNDRV_CARDS; i++)
591 if (!usb_chip[i] &&
592 (vid[i] == -1 || vid[i] == USB_ID_VENDOR(id)) &&
593 (pid[i] == -1 || pid[i] == USB_ID_PRODUCT(id))) {
594 if (enable[i]) {
595 err = snd_usb_audio_create(intf, dev, i, quirk,
596 id, &chip);
597 if (err < 0)
598 goto __error;
599 chip->pm_intf = intf;
600 break;
601 } else if (vid[i] != -1 || pid[i] != -1) {
602 dev_info(&dev->dev,
603 "device (%04x:%04x) is disabled\n",
604 USB_ID_VENDOR(id),
605 USB_ID_PRODUCT(id));
606 err = -ENOENT;
607 goto __error;
608 }
609 }
610 if (!chip) {
611 dev_err(&dev->dev, "no available usb audio device\n");
612 err = -ENODEV;
613 goto __error;
614 }
615 }
616 dev_set_drvdata(&dev->dev, chip);
617
618 /*
619 * For devices with more than one control interface, we assume the
620 * first contains the audio controls. We might need a more specific
621 * check here in the future.
622 */
623 if (!chip->ctrl_intf)
624 chip->ctrl_intf = alts;
625
626 chip->txfr_quirk = 0;
627 err = 1; /* continue */
628 if (quirk && quirk->ifnum != QUIRK_NO_INTERFACE) {
629 /* need some special handlings */
630 err = snd_usb_create_quirk(chip, intf, &usb_audio_driver, quirk);
631 if (err < 0)
632 goto __error;
633 }
634
635 if (err > 0) {
636 /* create normal USB audio interfaces */
637 err = snd_usb_create_streams(chip, ifnum);
638 if (err < 0)
639 goto __error;
640 err = snd_usb_create_mixer(chip, ifnum, ignore_ctl_error);
641 if (err < 0)
642 goto __error;
643 }
644
645 /* we are allowed to call snd_card_register() many times */
646 err = snd_card_register(chip->card);
647 if (err < 0)
648 goto __error;
649
650 usb_chip[chip->index] = chip;
651 chip->num_interfaces++;
652 usb_set_intfdata(intf, chip);
653 atomic_dec(&chip->active);
654 mutex_unlock(®ister_mutex);
655 return 0;
656
657 __error:
658 if (chip) {
659 if (!chip->num_interfaces)
660 snd_card_free(chip->card);
661 atomic_dec(&chip->active);
662 }
663 mutex_unlock(®ister_mutex);
664 return err;
665}
666
667/*
668 * we need to take care of counter, since disconnection can be called also
669 * many times as well as usb_audio_probe().
670 */
671static void usb_audio_disconnect(struct usb_interface *intf)
672{
673 struct snd_usb_audio *chip = usb_get_intfdata(intf);
674 struct snd_card *card;
675 struct list_head *p;
676
677 if (chip == (void *)-1L)
678 return;
679
680 card = chip->card;
681
682 mutex_lock(®ister_mutex);
683 if (atomic_inc_return(&chip->shutdown) == 1) {
684 struct snd_usb_stream *as;
685 struct snd_usb_endpoint *ep;
686 struct usb_mixer_interface *mixer;
687
688 /* wait until all pending tasks done;
689 * they are protected by snd_usb_lock_shutdown()
690 */
691 wait_event(chip->shutdown_wait,
692 !atomic_read(&chip->usage_count));
693 snd_card_disconnect(card);
694 /* release the pcm resources */
695 list_for_each_entry(as, &chip->pcm_list, list) {
696 snd_usb_stream_disconnect(as);
697 }
698 /* release the endpoint resources */
699 list_for_each_entry(ep, &chip->ep_list, list) {
700 snd_usb_endpoint_release(ep);
701 }
702 /* release the midi resources */
703 list_for_each(p, &chip->midi_list) {
704 snd_usbmidi_disconnect(p);
705 }
706 /* release mixer resources */
707 list_for_each_entry(mixer, &chip->mixer_list, list) {
708 snd_usb_mixer_disconnect(mixer);
709 }
710 }
711
712 chip->num_interfaces--;
713 if (chip->num_interfaces <= 0) {
714 usb_chip[chip->index] = NULL;
715 mutex_unlock(®ister_mutex);
716 snd_card_free_when_closed(card);
717 } else {
718 mutex_unlock(®ister_mutex);
719 }
720}
721
722/* lock the shutdown (disconnect) task and autoresume */
723int snd_usb_lock_shutdown(struct snd_usb_audio *chip)
724{
725 int err;
726
727 atomic_inc(&chip->usage_count);
728 if (atomic_read(&chip->shutdown)) {
729 err = -EIO;
730 goto error;
731 }
732 err = snd_usb_autoresume(chip);
733 if (err < 0)
734 goto error;
735 return 0;
736
737 error:
738 if (atomic_dec_and_test(&chip->usage_count))
739 wake_up(&chip->shutdown_wait);
740 return err;
741}
742
743/* autosuspend and unlock the shutdown */
744void snd_usb_unlock_shutdown(struct snd_usb_audio *chip)
745{
746 snd_usb_autosuspend(chip);
747 if (atomic_dec_and_test(&chip->usage_count))
748 wake_up(&chip->shutdown_wait);
749}
750
751#ifdef CONFIG_PM
752
753int snd_usb_autoresume(struct snd_usb_audio *chip)
754{
755 if (atomic_read(&chip->shutdown))
756 return -EIO;
757 if (atomic_inc_return(&chip->active) == 1)
758 return usb_autopm_get_interface(chip->pm_intf);
759 return 0;
760}
761
762void snd_usb_autosuspend(struct snd_usb_audio *chip)
763{
764 if (atomic_read(&chip->shutdown))
765 return;
766 if (atomic_dec_and_test(&chip->active))
767 usb_autopm_put_interface(chip->pm_intf);
768}
769
770static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message)
771{
772 struct snd_usb_audio *chip = usb_get_intfdata(intf);
773 struct snd_usb_stream *as;
774 struct usb_mixer_interface *mixer;
775 struct list_head *p;
776
777 if (chip == (void *)-1L)
778 return 0;
779
780 chip->autosuspended = !!PMSG_IS_AUTO(message);
781 if (!chip->autosuspended)
782 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot);
783 if (!chip->num_suspended_intf++) {
784 list_for_each_entry(as, &chip->pcm_list, list) {
785 snd_pcm_suspend_all(as->pcm);
786 as->substream[0].need_setup_ep =
787 as->substream[1].need_setup_ep = true;
788 }
789 list_for_each(p, &chip->midi_list)
790 snd_usbmidi_suspend(p);
791 list_for_each_entry(mixer, &chip->mixer_list, list)
792 snd_usb_mixer_suspend(mixer);
793 }
794
795 return 0;
796}
797
798static int __usb_audio_resume(struct usb_interface *intf, bool reset_resume)
799{
800 struct snd_usb_audio *chip = usb_get_intfdata(intf);
801 struct usb_mixer_interface *mixer;
802 struct list_head *p;
803 int err = 0;
804
805 if (chip == (void *)-1L)
806 return 0;
807 if (--chip->num_suspended_intf)
808 return 0;
809
810 atomic_inc(&chip->active); /* avoid autopm */
811 /*
812 * ALSA leaves material resumption to user space
813 * we just notify and restart the mixers
814 */
815 list_for_each_entry(mixer, &chip->mixer_list, list) {
816 err = snd_usb_mixer_resume(mixer, reset_resume);
817 if (err < 0)
818 goto err_out;
819 }
820
821 list_for_each(p, &chip->midi_list) {
822 snd_usbmidi_resume(p);
823 }
824
825 if (!chip->autosuspended)
826 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0);
827 chip->autosuspended = 0;
828
829err_out:
830 atomic_dec(&chip->active); /* allow autopm after this point */
831 return err;
832}
833
834static int usb_audio_resume(struct usb_interface *intf)
835{
836 return __usb_audio_resume(intf, false);
837}
838
839static int usb_audio_reset_resume(struct usb_interface *intf)
840{
841 return __usb_audio_resume(intf, true);
842}
843#else
844#define usb_audio_suspend NULL
845#define usb_audio_resume NULL
846#define usb_audio_reset_resume NULL
847#endif /* CONFIG_PM */
848
849static const struct usb_device_id usb_audio_ids [] = {
850#include "quirks-table.h"
851 { .match_flags = (USB_DEVICE_ID_MATCH_INT_CLASS | USB_DEVICE_ID_MATCH_INT_SUBCLASS),
852 .bInterfaceClass = USB_CLASS_AUDIO,
853 .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL },
854 { } /* Terminating entry */
855};
856MODULE_DEVICE_TABLE(usb, usb_audio_ids);
857
858/*
859 * entry point for linux usb interface
860 */
861
862static struct usb_driver usb_audio_driver = {
863 .name = "snd-usb-audio",
864 .probe = usb_audio_probe,
865 .disconnect = usb_audio_disconnect,
866 .suspend = usb_audio_suspend,
867 .resume = usb_audio_resume,
868 .reset_resume = usb_audio_reset_resume,
869 .id_table = usb_audio_ids,
870 .supports_autosuspend = 1,
871};
872
873module_usb_driver(usb_audio_driver);