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
59 MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
60 MODULE_DESCRIPTION("USB Audio");
61 MODULE_LICENSE("GPL");
62
63 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */
64 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */
65 static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;/* Enable this card */
66 /* Vendor/product IDs for this card */
67 static int vid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 };
68 static int pid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 };
69 static int device_setup[SNDRV_CARDS]; /* device parameter for this card */
70 static bool ignore_ctl_error;
71 static bool autoclock = true;
72 static bool lowlatency = true;
73 static char *quirk_alias[SNDRV_CARDS];
74 static char *delayed_register[SNDRV_CARDS];
75 static bool implicit_fb[SNDRV_CARDS];
76 static unsigned int quirk_flags[SNDRV_CARDS];
77
78 bool snd_usb_use_vmalloc = true;
79 bool snd_usb_skip_validation;
80
81 module_param_array(index, int, NULL, 0444);
82 MODULE_PARM_DESC(index, "Index value for the USB audio adapter.");
83 module_param_array(id, charp, NULL, 0444);
84 MODULE_PARM_DESC(id, "ID string for the USB audio adapter.");
85 module_param_array(enable, bool, NULL, 0444);
86 MODULE_PARM_DESC(enable, "Enable USB audio adapter.");
87 module_param_array(vid, int, NULL, 0444);
88 MODULE_PARM_DESC(vid, "Vendor ID for the USB audio device.");
89 module_param_array(pid, int, NULL, 0444);
90 MODULE_PARM_DESC(pid, "Product ID for the USB audio device.");
91 module_param_array(device_setup, int, NULL, 0444);
92 MODULE_PARM_DESC(device_setup, "Specific device setup (if needed).");
93 module_param(ignore_ctl_error, bool, 0444);
94 MODULE_PARM_DESC(ignore_ctl_error,
95 "Ignore errors from USB controller for mixer interfaces.");
96 module_param(autoclock, bool, 0444);
97 MODULE_PARM_DESC(autoclock, "Enable auto-clock selection for UAC2 devices (default: yes).");
98 module_param(lowlatency, bool, 0444);
99 MODULE_PARM_DESC(lowlatency, "Enable low latency playback (default: yes).");
100 module_param_array(quirk_alias, charp, NULL, 0444);
101 MODULE_PARM_DESC(quirk_alias, "Quirk aliases, e.g. 0123abcd:5678beef.");
102 module_param_array(delayed_register, charp, NULL, 0444);
103 MODULE_PARM_DESC(delayed_register, "Quirk for delayed registration, given by id:iface, e.g. 0123abcd:4.");
104 module_param_array(implicit_fb, bool, NULL, 0444);
105 MODULE_PARM_DESC(implicit_fb, "Apply generic implicit feedback sync mode.");
106 module_param_array(quirk_flags, uint, NULL, 0444);
107 MODULE_PARM_DESC(quirk_flags, "Driver quirk bit flags.");
108 module_param_named(use_vmalloc, snd_usb_use_vmalloc, bool, 0444);
109 MODULE_PARM_DESC(use_vmalloc, "Use vmalloc for PCM intermediate buffers (default: yes).");
110 module_param_named(skip_validation, snd_usb_skip_validation, bool, 0444);
111 MODULE_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
118 static DEFINE_MUTEX(register_mutex);
119 static struct snd_usb_audio *usb_chip[SNDRV_CARDS];
120 static struct usb_driver usb_audio_driver;
121 static struct snd_usb_platform_ops *platform_ops;
122
123 /*
124 * Register platform specific operations that will be notified on events
125 * which occur in USB SND. The platform driver can utilize this path to
126 * enable features, such as USB audio offloading, which allows for audio data
127 * to be queued by an audio DSP.
128 *
129 * Only one set of platform operations can be registered to USB SND. The
130 * platform register operation is protected by the register_mutex.
131 */
snd_usb_register_platform_ops(struct snd_usb_platform_ops * ops)132 int snd_usb_register_platform_ops(struct snd_usb_platform_ops *ops)
133 {
134 guard(mutex)(®ister_mutex);
135 if (platform_ops)
136 return -EEXIST;
137
138 platform_ops = ops;
139 return 0;
140 }
141 EXPORT_SYMBOL_GPL(snd_usb_register_platform_ops);
142
143 /*
144 * Unregisters the current set of platform operations. This allows for
145 * a new set to be registered if required.
146 *
147 * The platform unregister operation is protected by the register_mutex.
148 */
snd_usb_unregister_platform_ops(void)149 int snd_usb_unregister_platform_ops(void)
150 {
151 guard(mutex)(®ister_mutex);
152 platform_ops = NULL;
153
154 return 0;
155 }
156 EXPORT_SYMBOL_GPL(snd_usb_unregister_platform_ops);
157
158 /*
159 * Checks to see if requested audio profile, i.e sample rate, # of
160 * channels, etc... is supported by the substream associated to the
161 * USB audio device.
162 */
163 struct snd_usb_stream *
snd_usb_find_suppported_substream(int card_idx,struct snd_pcm_hw_params * params,int direction)164 snd_usb_find_suppported_substream(int card_idx, struct snd_pcm_hw_params *params,
165 int direction)
166 {
167 struct snd_usb_audio *chip;
168 struct snd_usb_substream *subs;
169 struct snd_usb_stream *as;
170
171 /*
172 * Register mutex is held when populating and clearing usb_chip
173 * array.
174 */
175 guard(mutex)(®ister_mutex);
176 chip = usb_chip[card_idx];
177
178 if (chip && enable[card_idx]) {
179 list_for_each_entry(as, &chip->pcm_list, list) {
180 subs = &as->substream[direction];
181 if (snd_usb_find_substream_format(subs, params))
182 return as;
183 }
184 }
185
186 return NULL;
187 }
188 EXPORT_SYMBOL_GPL(snd_usb_find_suppported_substream);
189
190 /*
191 * disconnect streams
192 * called from usb_audio_disconnect()
193 */
snd_usb_stream_disconnect(struct snd_usb_stream * as)194 static void snd_usb_stream_disconnect(struct snd_usb_stream *as)
195 {
196 int idx;
197 struct snd_usb_substream *subs;
198
199 for (idx = 0; idx < 2; idx++) {
200 subs = &as->substream[idx];
201 if (!subs->num_formats)
202 continue;
203 subs->data_endpoint = NULL;
204 subs->sync_endpoint = NULL;
205 }
206 }
207
snd_usb_create_stream(struct snd_usb_audio * chip,int ctrlif,int interface)208 static int snd_usb_create_stream(struct snd_usb_audio *chip, int ctrlif, int interface)
209 {
210 struct usb_device *dev = chip->dev;
211 struct usb_host_interface *alts;
212 struct usb_interface_descriptor *altsd;
213 struct usb_interface *iface = usb_ifnum_to_if(dev, interface);
214
215 if (!iface) {
216 dev_err(&dev->dev, "%u:%d : does not exist\n",
217 ctrlif, interface);
218 return -EINVAL;
219 }
220
221 alts = &iface->altsetting[0];
222 altsd = get_iface_desc(alts);
223
224 /*
225 * Android with both accessory and audio interfaces enabled gets the
226 * interface numbers wrong.
227 */
228 if ((chip->usb_id == USB_ID(0x18d1, 0x2d04) ||
229 chip->usb_id == USB_ID(0x18d1, 0x2d05)) &&
230 interface == 0 &&
231 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
232 altsd->bInterfaceSubClass == USB_SUBCLASS_VENDOR_SPEC) {
233 interface = 2;
234 iface = usb_ifnum_to_if(dev, interface);
235 if (!iface)
236 return -EINVAL;
237 alts = &iface->altsetting[0];
238 altsd = get_iface_desc(alts);
239 }
240
241 if (usb_interface_claimed(iface)) {
242 dev_dbg(&dev->dev, "%d:%d: skipping, already claimed\n",
243 ctrlif, interface);
244 return -EINVAL;
245 }
246
247 if ((altsd->bInterfaceClass == USB_CLASS_AUDIO ||
248 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC) &&
249 altsd->bInterfaceSubClass == USB_SUBCLASS_MIDISTREAMING) {
250 int err = snd_usb_midi_v2_create(chip, iface, NULL,
251 chip->usb_id);
252 if (err < 0) {
253 dev_err(&dev->dev,
254 "%u:%d: cannot create sequencer device\n",
255 ctrlif, interface);
256 return -EINVAL;
257 }
258 return usb_driver_claim_interface(&usb_audio_driver, iface,
259 USB_AUDIO_IFACE_UNUSED);
260 }
261
262 if ((altsd->bInterfaceClass != USB_CLASS_AUDIO &&
263 altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
264 altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING) {
265 dev_dbg(&dev->dev,
266 "%u:%d: skipping non-supported interface %d\n",
267 ctrlif, interface, altsd->bInterfaceClass);
268 /* skip non-supported classes */
269 return -EINVAL;
270 }
271
272 if (snd_usb_get_speed(dev) == USB_SPEED_LOW) {
273 dev_err(&dev->dev, "low speed audio streaming not supported\n");
274 return -EINVAL;
275 }
276
277 snd_usb_add_ctrl_interface_link(chip, interface, ctrlif);
278
279 if (! snd_usb_parse_audio_interface(chip, interface)) {
280 usb_set_interface(dev, interface, 0); /* reset the current interface */
281 return usb_driver_claim_interface(&usb_audio_driver, iface,
282 USB_AUDIO_IFACE_UNUSED);
283 }
284
285 return 0;
286 }
287
288 /*
289 * parse audio control descriptor and create pcm/midi streams
290 */
snd_usb_create_streams(struct snd_usb_audio * chip,int ctrlif)291 static int snd_usb_create_streams(struct snd_usb_audio *chip, int ctrlif)
292 {
293 struct usb_device *dev = chip->dev;
294 struct usb_host_interface *host_iface;
295 struct usb_interface_descriptor *altsd;
296 int i, protocol;
297
298 /* find audiocontrol interface */
299 host_iface = &usb_ifnum_to_if(dev, ctrlif)->altsetting[0];
300 altsd = get_iface_desc(host_iface);
301 protocol = altsd->bInterfaceProtocol;
302
303 switch (protocol) {
304 default:
305 dev_warn(&dev->dev,
306 "unknown interface protocol %#02x, assuming v1\n",
307 protocol);
308 fallthrough;
309
310 case UAC_VERSION_1: {
311 struct uac1_ac_header_descriptor *h1;
312 int rest_bytes;
313
314 h1 = snd_usb_find_csint_desc(host_iface->extra,
315 host_iface->extralen,
316 NULL, UAC_HEADER);
317 if (!h1 || h1->bLength < sizeof(*h1)) {
318 dev_err(&dev->dev, "cannot find UAC_HEADER\n");
319 return -EINVAL;
320 }
321
322 rest_bytes = (void *)(host_iface->extra +
323 host_iface->extralen) - (void *)h1;
324
325 /* just to be sure -- this shouldn't hit at all */
326 if (rest_bytes <= 0) {
327 dev_err(&dev->dev, "invalid control header\n");
328 return -EINVAL;
329 }
330
331 if (rest_bytes < sizeof(*h1)) {
332 dev_err(&dev->dev, "too short v1 buffer descriptor\n");
333 return -EINVAL;
334 }
335
336 if (!h1->bInCollection) {
337 dev_info(&dev->dev, "skipping empty audio interface (v1)\n");
338 return -EINVAL;
339 }
340
341 if (rest_bytes < h1->bLength) {
342 dev_err(&dev->dev, "invalid buffer length (v1)\n");
343 return -EINVAL;
344 }
345
346 if (h1->bLength < sizeof(*h1) + h1->bInCollection) {
347 dev_err(&dev->dev, "invalid UAC_HEADER (v1)\n");
348 return -EINVAL;
349 }
350
351 for (i = 0; i < h1->bInCollection; i++)
352 snd_usb_create_stream(chip, ctrlif, h1->baInterfaceNr[i]);
353
354 break;
355 }
356
357 case UAC_VERSION_2:
358 case UAC_VERSION_3: {
359 struct usb_interface_assoc_descriptor *assoc =
360 usb_ifnum_to_if(dev, ctrlif)->intf_assoc;
361
362 if (!assoc) {
363 /*
364 * Firmware writers cannot count to three. So to find
365 * the IAD on the NuForce UDH-100, also check the next
366 * interface.
367 */
368 struct usb_interface *iface =
369 usb_ifnum_to_if(dev, ctrlif + 1);
370 if (iface &&
371 iface->intf_assoc &&
372 iface->intf_assoc->bFunctionClass == USB_CLASS_AUDIO &&
373 iface->intf_assoc->bFunctionProtocol == UAC_VERSION_2)
374 assoc = iface->intf_assoc;
375 }
376
377 if (!assoc) {
378 dev_err(&dev->dev, "Audio class v2/v3 interfaces need an interface association\n");
379 return -EINVAL;
380 }
381
382 if (protocol == UAC_VERSION_3) {
383 int badd = assoc->bFunctionSubClass;
384
385 if (badd != UAC3_FUNCTION_SUBCLASS_FULL_ADC_3_0 &&
386 (badd < UAC3_FUNCTION_SUBCLASS_GENERIC_IO ||
387 badd > UAC3_FUNCTION_SUBCLASS_SPEAKERPHONE)) {
388 dev_err(&dev->dev,
389 "Unsupported UAC3 BADD profile\n");
390 return -EINVAL;
391 }
392
393 chip->badd_profile = badd;
394 }
395
396 for (i = 0; i < assoc->bInterfaceCount; i++) {
397 int intf = assoc->bFirstInterface + i;
398
399 if (intf != ctrlif)
400 snd_usb_create_stream(chip, ctrlif, intf);
401 }
402
403 break;
404 }
405 }
406
407 return 0;
408 }
409
410 /*
411 * Profile name preset table
412 */
413 struct usb_audio_device_name {
414 u32 id;
415 const char *vendor_name;
416 const char *product_name;
417 const char *profile_name; /* override card->longname */
418 };
419
420 #define PROFILE_NAME(vid, pid, vendor, product, profile) \
421 { .id = USB_ID(vid, pid), .vendor_name = (vendor), \
422 .product_name = (product), .profile_name = (profile) }
423 #define DEVICE_NAME(vid, pid, vendor, product) \
424 PROFILE_NAME(vid, pid, vendor, product, NULL)
425
426 /* vendor/product and profile name presets, sorted in device id order */
427 static const struct usb_audio_device_name usb_audio_names[] = {
428 /* HP Thunderbolt Dock Audio Headset */
429 PROFILE_NAME(0x03f0, 0x0269, "HP", "Thunderbolt Dock Audio Headset",
430 "HP-Thunderbolt-Dock-Audio-Headset"),
431 /* HP Thunderbolt Dock Audio Module */
432 PROFILE_NAME(0x03f0, 0x0567, "HP", "Thunderbolt Dock Audio Module",
433 "HP-Thunderbolt-Dock-Audio-Module"),
434
435 /* Two entries for Gigabyte TRX40 Aorus Master:
436 * TRX40 Aorus Master has two USB-audio devices, one for the front
437 * headphone with ESS SABRE9218 DAC chip, while another for the rest
438 * I/O (the rear panel and the front mic) with Realtek ALC1220-VB.
439 * Here we provide two distinct names for making UCM profiles easier.
440 */
441 PROFILE_NAME(0x0414, 0xa000, "Gigabyte", "Aorus Master Front Headphone",
442 "Gigabyte-Aorus-Master-Front-Headphone"),
443 PROFILE_NAME(0x0414, 0xa001, "Gigabyte", "Aorus Master Main Audio",
444 "Gigabyte-Aorus-Master-Main-Audio"),
445
446 /* Gigabyte TRX40 Aorus Pro WiFi */
447 PROFILE_NAME(0x0414, 0xa002,
448 "Realtek", "ALC1220-VB-DT", "Realtek-ALC1220-VB-Desktop"),
449
450 /* Creative/E-Mu devices */
451 DEVICE_NAME(0x041e, 0x3010, "Creative Labs", "Sound Blaster MP3+"),
452 /* Creative/Toshiba Multimedia Center SB-0500 */
453 DEVICE_NAME(0x041e, 0x3048, "Toshiba", "SB-0500"),
454
455 /* Logitech Audio Devices */
456 DEVICE_NAME(0x046d, 0x0867, "Logitech, Inc.", "Logi-MeetUp"),
457 DEVICE_NAME(0x046d, 0x0874, "Logitech, Inc.", "Logi-Tap-Audio"),
458 DEVICE_NAME(0x046d, 0x087c, "Logitech, Inc.", "Logi-Huddle"),
459 DEVICE_NAME(0x046d, 0x0898, "Logitech, Inc.", "Logi-RB-Audio"),
460 DEVICE_NAME(0x046d, 0x08d2, "Logitech, Inc.", "Logi-RBM-Audio"),
461 DEVICE_NAME(0x046d, 0x0990, "Logitech, Inc.", "QuickCam Pro 9000"),
462
463 DEVICE_NAME(0x05e1, 0x0408, "Syntek", "STK1160"),
464 DEVICE_NAME(0x05e1, 0x0480, "Hauppauge", "Woodbury"),
465
466 /* ASUS ROG Zenith II: this machine has also two devices, one for
467 * the front headphone and another for the rest
468 */
469 PROFILE_NAME(0x0b05, 0x1915, "ASUS", "Zenith II Front Headphone",
470 "Zenith-II-Front-Headphone"),
471 PROFILE_NAME(0x0b05, 0x1916, "ASUS", "Zenith II Main Audio",
472 "Zenith-II-Main-Audio"),
473
474 /* ASUS ROG Strix */
475 PROFILE_NAME(0x0b05, 0x1917,
476 "Realtek", "ALC1220-VB-DT", "Realtek-ALC1220-VB-Desktop"),
477 /* ASUS PRIME TRX40 PRO-S */
478 PROFILE_NAME(0x0b05, 0x1918,
479 "Realtek", "ALC1220-VB-DT", "Realtek-ALC1220-VB-Desktop"),
480
481 /* Dell WD15 Dock */
482 PROFILE_NAME(0x0bda, 0x4014, "Dell", "WD15 Dock", "Dell-WD15-Dock"),
483 /* Dell WD19 Dock */
484 PROFILE_NAME(0x0bda, 0x402e, "Dell", "WD19 Dock", "Dell-WD15-Dock"),
485
486 DEVICE_NAME(0x0ccd, 0x0028, "TerraTec", "Aureon5.1MkII"),
487
488 /*
489 * The original product_name is "USB Sound Device", however this name
490 * is also used by the CM106 based cards, so make it unique.
491 */
492 DEVICE_NAME(0x0d8c, 0x0102, NULL, "ICUSBAUDIO7D"),
493 DEVICE_NAME(0x0d8c, 0x0103, NULL, "Audio Advantage MicroII"),
494
495 /* MSI TRX40 Creator */
496 PROFILE_NAME(0x0db0, 0x0d64,
497 "Realtek", "ALC1220-VB-DT", "Realtek-ALC1220-VB-Desktop"),
498 /* MSI TRX40 */
499 PROFILE_NAME(0x0db0, 0x543d,
500 "Realtek", "ALC1220-VB-DT", "Realtek-ALC1220-VB-Desktop"),
501
502 DEVICE_NAME(0x0fd9, 0x0008, "Hauppauge", "HVR-950Q"),
503
504 /* Dock/Stand for HP Engage Go */
505 PROFILE_NAME(0x103c, 0x830a, "HP", "HP Engage Go Dock",
506 "HP-Engage-Go-Dock"),
507
508 /* Stanton/N2IT Final Scratch v1 device ('Scratchamp') */
509 DEVICE_NAME(0x103d, 0x0100, "Stanton", "ScratchAmp"),
510 DEVICE_NAME(0x103d, 0x0101, "Stanton", "ScratchAmp"),
511
512 /* aka. Serato Scratch Live DJ Box */
513 DEVICE_NAME(0x13e5, 0x0001, "Rane", "SL-1"),
514
515 /* Lenovo ThinkStation P620 Rear Line-in, Line-out and Microphone */
516 PROFILE_NAME(0x17aa, 0x1046, "Lenovo", "ThinkStation P620 Rear",
517 "Lenovo-ThinkStation-P620-Rear"),
518 /* Lenovo ThinkStation P620 Internal Speaker + Front Headset */
519 PROFILE_NAME(0x17aa, 0x104d, "Lenovo", "ThinkStation P620 Main",
520 "Lenovo-ThinkStation-P620-Main"),
521
522 /* Asrock TRX40 Creator */
523 PROFILE_NAME(0x26ce, 0x0a01,
524 "Realtek", "ALC1220-VB-DT", "Realtek-ALC1220-VB-Desktop"),
525
526 DEVICE_NAME(0x2040, 0x7200, "Hauppauge", "HVR-950Q"),
527 DEVICE_NAME(0x2040, 0x7201, "Hauppauge", "HVR-950Q-MXL"),
528 DEVICE_NAME(0x2040, 0x7210, "Hauppauge", "HVR-950Q"),
529 DEVICE_NAME(0x2040, 0x7211, "Hauppauge", "HVR-950Q-MXL"),
530 DEVICE_NAME(0x2040, 0x7213, "Hauppauge", "HVR-950Q"),
531 DEVICE_NAME(0x2040, 0x7217, "Hauppauge", "HVR-950Q"),
532 DEVICE_NAME(0x2040, 0x721b, "Hauppauge", "HVR-950Q"),
533 DEVICE_NAME(0x2040, 0x721e, "Hauppauge", "HVR-950Q"),
534 DEVICE_NAME(0x2040, 0x721f, "Hauppauge", "HVR-950Q"),
535 DEVICE_NAME(0x2040, 0x7240, "Hauppauge", "HVR-850"),
536 DEVICE_NAME(0x2040, 0x7260, "Hauppauge", "HVR-950Q"),
537 DEVICE_NAME(0x2040, 0x7270, "Hauppauge", "HVR-950Q"),
538 DEVICE_NAME(0x2040, 0x7280, "Hauppauge", "HVR-950Q"),
539 DEVICE_NAME(0x2040, 0x7281, "Hauppauge", "HVR-950Q-MXL"),
540 DEVICE_NAME(0x2040, 0x8200, "Hauppauge", "Woodbury"),
541
542 { } /* terminator */
543 };
544
545 static const struct usb_audio_device_name *
lookup_device_name(u32 id)546 lookup_device_name(u32 id)
547 {
548 static const struct usb_audio_device_name *p;
549
550 for (p = usb_audio_names; p->id; p++)
551 if (p->id == id)
552 return p;
553 return NULL;
554 }
555
556 /*
557 * free the chip instance
558 *
559 * here we have to do not much, since pcm and controls are already freed
560 *
561 */
562
snd_usb_audio_free(struct snd_card * card)563 static void snd_usb_audio_free(struct snd_card *card)
564 {
565 struct snd_usb_audio *chip = card->private_data;
566
567 snd_usb_endpoint_free_all(chip);
568 snd_usb_midi_v2_free_all(chip);
569
570 mutex_destroy(&chip->mutex);
571 if (!atomic_read(&chip->shutdown))
572 dev_set_drvdata(&chip->dev->dev, NULL);
573 }
574
usb_audio_make_shortname(struct usb_device * dev,struct snd_usb_audio * chip,const struct snd_usb_audio_quirk * quirk)575 static void usb_audio_make_shortname(struct usb_device *dev,
576 struct snd_usb_audio *chip,
577 const struct snd_usb_audio_quirk *quirk)
578 {
579 struct snd_card *card = chip->card;
580 const struct usb_audio_device_name *preset;
581 const char *s = NULL;
582
583 preset = lookup_device_name(chip->usb_id);
584 if (preset && preset->product_name)
585 s = preset->product_name;
586 else if (quirk && quirk->product_name)
587 s = quirk->product_name;
588 if (s && *s) {
589 strscpy(card->shortname, s, sizeof(card->shortname));
590 return;
591 }
592
593 /* retrieve the device string as shortname */
594 if (!dev->descriptor.iProduct ||
595 usb_string(dev, dev->descriptor.iProduct,
596 card->shortname, sizeof(card->shortname)) <= 0) {
597 /* no name available from anywhere, so use ID */
598 sprintf(card->shortname, "USB Device %#04x:%#04x",
599 USB_ID_VENDOR(chip->usb_id),
600 USB_ID_PRODUCT(chip->usb_id));
601 }
602
603 strim(card->shortname);
604 }
605
usb_audio_make_longname(struct usb_device * dev,struct snd_usb_audio * chip,const struct snd_usb_audio_quirk * quirk)606 static void usb_audio_make_longname(struct usb_device *dev,
607 struct snd_usb_audio *chip,
608 const struct snd_usb_audio_quirk *quirk)
609 {
610 struct snd_card *card = chip->card;
611 const struct usb_audio_device_name *preset;
612 const char *s = NULL;
613 int len;
614
615 preset = lookup_device_name(chip->usb_id);
616
617 /* shortcut - if any pre-defined string is given, use it */
618 if (preset && preset->profile_name)
619 s = preset->profile_name;
620 if (s && *s) {
621 strscpy(card->longname, s, sizeof(card->longname));
622 return;
623 }
624
625 if (preset && preset->vendor_name)
626 s = preset->vendor_name;
627 else if (quirk && quirk->vendor_name)
628 s = quirk->vendor_name;
629 *card->longname = 0;
630 if (s && *s) {
631 strscpy(card->longname, s, sizeof(card->longname));
632 } else {
633 /* retrieve the vendor and device strings as longname */
634 if (dev->descriptor.iManufacturer)
635 usb_string(dev, dev->descriptor.iManufacturer,
636 card->longname, sizeof(card->longname));
637 /* we don't really care if there isn't any vendor string */
638 }
639 if (*card->longname) {
640 strim(card->longname);
641 if (*card->longname)
642 strlcat(card->longname, " ", sizeof(card->longname));
643 }
644
645 strlcat(card->longname, card->shortname, sizeof(card->longname));
646
647 len = strlcat(card->longname, " at ", sizeof(card->longname));
648
649 if (len < sizeof(card->longname))
650 usb_make_path(dev, card->longname + len, sizeof(card->longname) - len);
651
652 switch (snd_usb_get_speed(dev)) {
653 case USB_SPEED_LOW:
654 strlcat(card->longname, ", low speed", sizeof(card->longname));
655 break;
656 case USB_SPEED_FULL:
657 strlcat(card->longname, ", full speed", sizeof(card->longname));
658 break;
659 case USB_SPEED_HIGH:
660 strlcat(card->longname, ", high speed", sizeof(card->longname));
661 break;
662 case USB_SPEED_SUPER:
663 strlcat(card->longname, ", super speed", sizeof(card->longname));
664 break;
665 case USB_SPEED_SUPER_PLUS:
666 strlcat(card->longname, ", super speed plus", sizeof(card->longname));
667 break;
668 default:
669 break;
670 }
671 }
672
673 /*
674 * create a chip instance and set its names.
675 */
snd_usb_audio_create(struct usb_interface * intf,struct usb_device * dev,int idx,const struct snd_usb_audio_quirk * quirk,unsigned int usb_id,struct snd_usb_audio ** rchip)676 static int snd_usb_audio_create(struct usb_interface *intf,
677 struct usb_device *dev, int idx,
678 const struct snd_usb_audio_quirk *quirk,
679 unsigned int usb_id,
680 struct snd_usb_audio **rchip)
681 {
682 struct snd_card *card;
683 struct snd_usb_audio *chip;
684 int err;
685 char component[14];
686
687 *rchip = NULL;
688
689 switch (snd_usb_get_speed(dev)) {
690 case USB_SPEED_LOW:
691 case USB_SPEED_FULL:
692 case USB_SPEED_HIGH:
693 case USB_SPEED_SUPER:
694 case USB_SPEED_SUPER_PLUS:
695 break;
696 default:
697 dev_err(&dev->dev, "unknown device speed %d\n", snd_usb_get_speed(dev));
698 return -ENXIO;
699 }
700
701 err = snd_card_new(&intf->dev, index[idx], id[idx], THIS_MODULE,
702 sizeof(*chip), &card);
703 if (err < 0) {
704 dev_err(&dev->dev, "cannot create card instance %d\n", idx);
705 return err;
706 }
707
708 chip = card->private_data;
709 mutex_init(&chip->mutex);
710 init_waitqueue_head(&chip->shutdown_wait);
711 chip->index = idx;
712 chip->dev = dev;
713 chip->card = card;
714 chip->setup = device_setup[idx];
715 chip->generic_implicit_fb = implicit_fb[idx];
716 chip->autoclock = autoclock;
717 chip->lowlatency = lowlatency;
718 atomic_set(&chip->active, 1); /* avoid autopm during probing */
719 atomic_set(&chip->usage_count, 0);
720 atomic_set(&chip->shutdown, 0);
721
722 chip->usb_id = usb_id;
723 INIT_LIST_HEAD(&chip->pcm_list);
724 INIT_LIST_HEAD(&chip->ep_list);
725 INIT_LIST_HEAD(&chip->iface_ref_list);
726 INIT_LIST_HEAD(&chip->clock_ref_list);
727 INIT_LIST_HEAD(&chip->midi_list);
728 INIT_LIST_HEAD(&chip->midi_v2_list);
729 INIT_LIST_HEAD(&chip->mixer_list);
730
731 if (quirk_flags[idx])
732 chip->quirk_flags = quirk_flags[idx];
733 else
734 snd_usb_init_quirk_flags(chip);
735
736 card->private_free = snd_usb_audio_free;
737
738 strcpy(card->driver, "USB-Audio");
739 sprintf(component, "USB%04x:%04x",
740 USB_ID_VENDOR(chip->usb_id), USB_ID_PRODUCT(chip->usb_id));
741 snd_component_add(card, component);
742
743 usb_audio_make_shortname(dev, chip, quirk);
744 usb_audio_make_longname(dev, chip, quirk);
745
746 snd_usb_audio_create_proc(chip);
747
748 *rchip = chip;
749 return 0;
750 }
751
752 /* look for a matching quirk alias id */
get_alias_id(struct usb_device * dev,unsigned int * id)753 static bool get_alias_id(struct usb_device *dev, unsigned int *id)
754 {
755 int i;
756 unsigned int src, dst;
757
758 for (i = 0; i < ARRAY_SIZE(quirk_alias); i++) {
759 if (!quirk_alias[i] ||
760 sscanf(quirk_alias[i], "%x:%x", &src, &dst) != 2 ||
761 src != *id)
762 continue;
763 dev_info(&dev->dev,
764 "device (%04x:%04x): applying quirk alias %04x:%04x\n",
765 USB_ID_VENDOR(*id), USB_ID_PRODUCT(*id),
766 USB_ID_VENDOR(dst), USB_ID_PRODUCT(dst));
767 *id = dst;
768 return true;
769 }
770
771 return false;
772 }
773
check_delayed_register_option(struct snd_usb_audio * chip)774 static int check_delayed_register_option(struct snd_usb_audio *chip)
775 {
776 int i;
777 unsigned int id, inum;
778
779 for (i = 0; i < ARRAY_SIZE(delayed_register); i++) {
780 if (delayed_register[i] &&
781 sscanf(delayed_register[i], "%x:%x", &id, &inum) == 2 &&
782 id == chip->usb_id)
783 return inum;
784 }
785
786 return -1;
787 }
788
789 static const struct usb_device_id usb_audio_ids[]; /* defined below */
790
791 /* look for the last interface that matches with our ids and remember it */
find_last_interface(struct snd_usb_audio * chip)792 static void find_last_interface(struct snd_usb_audio *chip)
793 {
794 struct usb_host_config *config = chip->dev->actconfig;
795 struct usb_interface *intf;
796 int i;
797
798 if (!config)
799 return;
800 for (i = 0; i < config->desc.bNumInterfaces; i++) {
801 intf = config->interface[i];
802 if (usb_match_id(intf, usb_audio_ids))
803 chip->last_iface = intf->altsetting[0].desc.bInterfaceNumber;
804 }
805 usb_audio_dbg(chip, "Found last interface = %d\n", chip->last_iface);
806 }
807
808 /* look for the corresponding quirk */
809 static const struct snd_usb_audio_quirk *
get_alias_quirk(struct usb_device * dev,unsigned int id)810 get_alias_quirk(struct usb_device *dev, unsigned int id)
811 {
812 const struct usb_device_id *p;
813
814 for (p = usb_audio_ids; p->match_flags; p++) {
815 /* FIXME: this checks only vendor:product pair in the list */
816 if ((p->match_flags & USB_DEVICE_ID_MATCH_DEVICE) ==
817 USB_DEVICE_ID_MATCH_DEVICE &&
818 p->idVendor == USB_ID_VENDOR(id) &&
819 p->idProduct == USB_ID_PRODUCT(id))
820 return (const struct snd_usb_audio_quirk *)p->driver_info;
821 }
822
823 return NULL;
824 }
825
826 /* register card if we reach to the last interface or to the specified
827 * one given via option
828 */
try_to_register_card(struct snd_usb_audio * chip,int ifnum)829 static int try_to_register_card(struct snd_usb_audio *chip, int ifnum)
830 {
831 if (check_delayed_register_option(chip) == ifnum ||
832 chip->last_iface == ifnum ||
833 usb_interface_claimed(usb_ifnum_to_if(chip->dev, chip->last_iface)))
834 return snd_card_register(chip->card);
835 return 0;
836 }
837
838 /*
839 * probe the active usb device
840 *
841 * note that this can be called multiple times per a device, when it
842 * includes multiple audio control interfaces.
843 *
844 * thus we check the usb device pointer and creates the card instance
845 * only at the first time. the successive calls of this function will
846 * append the pcm interface to the corresponding card.
847 */
usb_audio_probe(struct usb_interface * intf,const struct usb_device_id * usb_id)848 static int usb_audio_probe(struct usb_interface *intf,
849 const struct usb_device_id *usb_id)
850 {
851 struct usb_device *dev = interface_to_usbdev(intf);
852 const struct snd_usb_audio_quirk *quirk =
853 (const struct snd_usb_audio_quirk *)usb_id->driver_info;
854 struct snd_usb_audio *chip;
855 int i, err;
856 struct usb_host_interface *alts;
857 int ifnum;
858 u32 id;
859
860 alts = &intf->altsetting[0];
861 ifnum = get_iface_desc(alts)->bInterfaceNumber;
862 id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
863 le16_to_cpu(dev->descriptor.idProduct));
864 if (get_alias_id(dev, &id))
865 quirk = get_alias_quirk(dev, id);
866 if (quirk && quirk->ifnum >= 0 && ifnum != quirk->ifnum)
867 return -ENXIO;
868 if (quirk && quirk->ifnum == QUIRK_NODEV_INTERFACE)
869 return -ENODEV;
870
871 err = snd_usb_apply_boot_quirk(dev, intf, quirk, id);
872 if (err < 0)
873 return err;
874
875 /*
876 * found a config. now register to ALSA
877 */
878
879 /* check whether it's already registered */
880 chip = NULL;
881 mutex_lock(®ister_mutex);
882 for (i = 0; i < SNDRV_CARDS; i++) {
883 if (usb_chip[i] && usb_chip[i]->dev == dev) {
884 if (atomic_read(&usb_chip[i]->shutdown)) {
885 dev_err(&dev->dev, "USB device is in the shutdown state, cannot create a card instance\n");
886 err = -EIO;
887 goto __error;
888 }
889 chip = usb_chip[i];
890 atomic_inc(&chip->active); /* avoid autopm */
891 break;
892 }
893 }
894 if (! chip) {
895 err = snd_usb_apply_boot_quirk_once(dev, intf, quirk, id);
896 if (err < 0)
897 goto __error;
898
899 /* it's a fresh one.
900 * now look for an empty slot and create a new card instance
901 */
902 for (i = 0; i < SNDRV_CARDS; i++)
903 if (!usb_chip[i] &&
904 (vid[i] == -1 || vid[i] == USB_ID_VENDOR(id)) &&
905 (pid[i] == -1 || pid[i] == USB_ID_PRODUCT(id))) {
906 if (enable[i]) {
907 err = snd_usb_audio_create(intf, dev, i, quirk,
908 id, &chip);
909 if (err < 0)
910 goto __error;
911 break;
912 } else if (vid[i] != -1 || pid[i] != -1) {
913 dev_info(&dev->dev,
914 "device (%04x:%04x) is disabled\n",
915 USB_ID_VENDOR(id),
916 USB_ID_PRODUCT(id));
917 err = -ENOENT;
918 goto __error;
919 }
920 }
921 if (!chip) {
922 dev_err(&dev->dev, "no available usb audio device\n");
923 err = -ENODEV;
924 goto __error;
925 }
926 find_last_interface(chip);
927 }
928
929 if (chip->num_interfaces >= MAX_CARD_INTERFACES) {
930 dev_info(&dev->dev, "Too many interfaces assigned to the single USB-audio card\n");
931 err = -EINVAL;
932 goto __error;
933 }
934
935 dev_set_drvdata(&dev->dev, chip);
936
937 if (ignore_ctl_error)
938 chip->quirk_flags |= QUIRK_FLAG_IGNORE_CTL_ERROR;
939
940 if (chip->quirk_flags & QUIRK_FLAG_DISABLE_AUTOSUSPEND)
941 usb_disable_autosuspend(interface_to_usbdev(intf));
942
943 /*
944 * For devices with more than one control interface, we assume the
945 * first contains the audio controls. We might need a more specific
946 * check here in the future.
947 */
948 if (!chip->ctrl_intf)
949 chip->ctrl_intf = alts;
950
951 err = 1; /* continue */
952 if (quirk && quirk->ifnum != QUIRK_NO_INTERFACE) {
953 /* need some special handlings */
954 err = snd_usb_create_quirk(chip, intf, &usb_audio_driver, quirk);
955 if (err < 0)
956 goto __error;
957 }
958
959 if (err > 0) {
960 /* create normal USB audio interfaces */
961 err = snd_usb_create_streams(chip, ifnum);
962 if (err < 0)
963 goto __error;
964 err = snd_usb_create_mixer(chip, ifnum);
965 if (err < 0)
966 goto __error;
967 }
968
969 if (chip->need_delayed_register) {
970 dev_info(&dev->dev,
971 "Found post-registration device assignment: %08x:%02x\n",
972 chip->usb_id, ifnum);
973 chip->need_delayed_register = false; /* clear again */
974 }
975
976 err = try_to_register_card(chip, ifnum);
977 if (err < 0)
978 goto __error_no_register;
979
980 if (chip->quirk_flags & QUIRK_FLAG_SHARE_MEDIA_DEVICE) {
981 /* don't want to fail when snd_media_device_create() fails */
982 snd_media_device_create(chip, intf);
983 }
984
985 if (quirk)
986 chip->quirk_type = quirk->type;
987
988 usb_chip[chip->index] = chip;
989 chip->intf[chip->num_interfaces] = intf;
990 chip->num_interfaces++;
991 usb_set_intfdata(intf, chip);
992 atomic_dec(&chip->active);
993
994 if (platform_ops && platform_ops->connect_cb)
995 platform_ops->connect_cb(chip);
996 mutex_unlock(®ister_mutex);
997
998 return 0;
999
1000 __error:
1001 /* in the case of error in secondary interface, still try to register */
1002 if (chip)
1003 try_to_register_card(chip, ifnum);
1004
1005 __error_no_register:
1006 if (chip) {
1007 /* chip->active is inside the chip->card object,
1008 * decrement before memory is possibly returned.
1009 */
1010 atomic_dec(&chip->active);
1011 if (!chip->num_interfaces)
1012 snd_card_free(chip->card);
1013 }
1014 mutex_unlock(®ister_mutex);
1015 return err;
1016 }
1017
1018 /*
1019 * we need to take care of counter, since disconnection can be called also
1020 * many times as well as usb_audio_probe().
1021 */
usb_audio_disconnect(struct usb_interface * intf)1022 static void usb_audio_disconnect(struct usb_interface *intf)
1023 {
1024 struct snd_usb_audio *chip = usb_get_intfdata(intf);
1025 struct snd_card *card;
1026 struct list_head *p;
1027
1028 if (chip == USB_AUDIO_IFACE_UNUSED)
1029 return;
1030
1031 card = chip->card;
1032
1033 mutex_lock(®ister_mutex);
1034 if (platform_ops && platform_ops->disconnect_cb)
1035 platform_ops->disconnect_cb(chip);
1036
1037 if (atomic_inc_return(&chip->shutdown) == 1) {
1038 struct snd_usb_stream *as;
1039 struct snd_usb_endpoint *ep;
1040 struct usb_mixer_interface *mixer;
1041
1042 /* wait until all pending tasks done;
1043 * they are protected by snd_usb_lock_shutdown()
1044 */
1045 wait_event(chip->shutdown_wait,
1046 !atomic_read(&chip->usage_count));
1047 snd_card_disconnect(card);
1048 /* release the pcm resources */
1049 list_for_each_entry(as, &chip->pcm_list, list) {
1050 snd_usb_stream_disconnect(as);
1051 }
1052 /* release the endpoint resources */
1053 list_for_each_entry(ep, &chip->ep_list, list) {
1054 snd_usb_endpoint_release(ep);
1055 }
1056 /* release the midi resources */
1057 list_for_each(p, &chip->midi_list) {
1058 snd_usbmidi_disconnect(p);
1059 }
1060 snd_usb_midi_v2_disconnect_all(chip);
1061 /*
1062 * Nice to check quirk && quirk->shares_media_device and
1063 * then call the snd_media_device_delete(). Don't have
1064 * access to the quirk here. snd_media_device_delete()
1065 * accesses mixer_list
1066 */
1067 snd_media_device_delete(chip);
1068
1069 /* release mixer resources */
1070 list_for_each_entry(mixer, &chip->mixer_list, list) {
1071 snd_usb_mixer_disconnect(mixer);
1072 }
1073 }
1074
1075 if (chip->quirk_flags & QUIRK_FLAG_DISABLE_AUTOSUSPEND)
1076 usb_enable_autosuspend(interface_to_usbdev(intf));
1077
1078 chip->num_interfaces--;
1079 if (chip->num_interfaces <= 0) {
1080 usb_chip[chip->index] = NULL;
1081 mutex_unlock(®ister_mutex);
1082 snd_card_free_when_closed(card);
1083 } else {
1084 mutex_unlock(®ister_mutex);
1085 }
1086 }
1087
1088 /* lock the shutdown (disconnect) task and autoresume */
snd_usb_lock_shutdown(struct snd_usb_audio * chip)1089 int snd_usb_lock_shutdown(struct snd_usb_audio *chip)
1090 {
1091 int err;
1092
1093 atomic_inc(&chip->usage_count);
1094 if (atomic_read(&chip->shutdown)) {
1095 err = -EIO;
1096 goto error;
1097 }
1098 err = snd_usb_autoresume(chip);
1099 if (err < 0)
1100 goto error;
1101 return 0;
1102
1103 error:
1104 if (atomic_dec_and_test(&chip->usage_count))
1105 wake_up(&chip->shutdown_wait);
1106 return err;
1107 }
1108 EXPORT_SYMBOL_GPL(snd_usb_lock_shutdown);
1109
1110 /* autosuspend and unlock the shutdown */
snd_usb_unlock_shutdown(struct snd_usb_audio * chip)1111 void snd_usb_unlock_shutdown(struct snd_usb_audio *chip)
1112 {
1113 snd_usb_autosuspend(chip);
1114 if (atomic_dec_and_test(&chip->usage_count))
1115 wake_up(&chip->shutdown_wait);
1116 }
1117 EXPORT_SYMBOL_GPL(snd_usb_unlock_shutdown);
1118
snd_usb_autoresume(struct snd_usb_audio * chip)1119 int snd_usb_autoresume(struct snd_usb_audio *chip)
1120 {
1121 int i, err;
1122
1123 if (atomic_read(&chip->shutdown))
1124 return -EIO;
1125 if (atomic_inc_return(&chip->active) != 1)
1126 return 0;
1127
1128 for (i = 0; i < chip->num_interfaces; i++) {
1129 err = usb_autopm_get_interface(chip->intf[i]);
1130 if (err < 0) {
1131 /* rollback */
1132 while (--i >= 0)
1133 usb_autopm_put_interface(chip->intf[i]);
1134 atomic_dec(&chip->active);
1135 return err;
1136 }
1137 }
1138 return 0;
1139 }
1140 EXPORT_SYMBOL_GPL(snd_usb_autoresume);
1141
snd_usb_autosuspend(struct snd_usb_audio * chip)1142 void snd_usb_autosuspend(struct snd_usb_audio *chip)
1143 {
1144 int i;
1145
1146 if (atomic_read(&chip->shutdown))
1147 return;
1148 if (!atomic_dec_and_test(&chip->active))
1149 return;
1150
1151 for (i = 0; i < chip->num_interfaces; i++)
1152 usb_autopm_put_interface(chip->intf[i]);
1153 }
1154 EXPORT_SYMBOL_GPL(snd_usb_autosuspend);
1155
usb_audio_suspend(struct usb_interface * intf,pm_message_t message)1156 static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message)
1157 {
1158 struct snd_usb_audio *chip = usb_get_intfdata(intf);
1159 struct snd_usb_stream *as;
1160 struct snd_usb_endpoint *ep;
1161 struct usb_mixer_interface *mixer;
1162 struct list_head *p;
1163
1164 if (chip == USB_AUDIO_IFACE_UNUSED)
1165 return 0;
1166
1167 if (!chip->num_suspended_intf++) {
1168 list_for_each_entry(as, &chip->pcm_list, list)
1169 snd_usb_pcm_suspend(as);
1170 list_for_each_entry(ep, &chip->ep_list, list)
1171 snd_usb_endpoint_suspend(ep);
1172 list_for_each(p, &chip->midi_list)
1173 snd_usbmidi_suspend(p);
1174 list_for_each_entry(mixer, &chip->mixer_list, list)
1175 snd_usb_mixer_suspend(mixer);
1176 snd_usb_midi_v2_suspend_all(chip);
1177 }
1178
1179 if (!PMSG_IS_AUTO(message) && !chip->system_suspend) {
1180 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot);
1181 chip->system_suspend = chip->num_suspended_intf;
1182 }
1183
1184 if (platform_ops && platform_ops->suspend_cb)
1185 platform_ops->suspend_cb(intf, message);
1186
1187 return 0;
1188 }
1189
usb_audio_resume(struct usb_interface * intf)1190 static int usb_audio_resume(struct usb_interface *intf)
1191 {
1192 struct snd_usb_audio *chip = usb_get_intfdata(intf);
1193 struct snd_usb_stream *as;
1194 struct usb_mixer_interface *mixer;
1195 struct list_head *p;
1196 int err = 0;
1197
1198 if (chip == USB_AUDIO_IFACE_UNUSED)
1199 return 0;
1200
1201 atomic_inc(&chip->active); /* avoid autopm */
1202 if (chip->num_suspended_intf > 1)
1203 goto out;
1204
1205 list_for_each_entry(as, &chip->pcm_list, list) {
1206 err = snd_usb_pcm_resume(as);
1207 if (err < 0)
1208 goto err_out;
1209 }
1210
1211 /*
1212 * ALSA leaves material resumption to user space
1213 * we just notify and restart the mixers
1214 */
1215 list_for_each_entry(mixer, &chip->mixer_list, list) {
1216 err = snd_usb_mixer_resume(mixer);
1217 if (err < 0)
1218 goto err_out;
1219 }
1220
1221 list_for_each(p, &chip->midi_list) {
1222 snd_usbmidi_resume(p);
1223 }
1224
1225 snd_usb_midi_v2_resume_all(chip);
1226
1227 if (platform_ops && platform_ops->resume_cb)
1228 platform_ops->resume_cb(intf);
1229
1230 out:
1231 if (chip->num_suspended_intf == chip->system_suspend) {
1232 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0);
1233 chip->system_suspend = 0;
1234 }
1235 chip->num_suspended_intf--;
1236
1237 err_out:
1238 atomic_dec(&chip->active); /* allow autopm after this point */
1239 return err;
1240 }
1241
1242 static const struct usb_device_id usb_audio_ids [] = {
1243 #include "quirks-table.h"
1244 { .match_flags = (USB_DEVICE_ID_MATCH_INT_CLASS | USB_DEVICE_ID_MATCH_INT_SUBCLASS),
1245 .bInterfaceClass = USB_CLASS_AUDIO,
1246 .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL },
1247 { } /* Terminating entry */
1248 };
1249 MODULE_DEVICE_TABLE(usb, usb_audio_ids);
1250
1251 /*
1252 * entry point for linux usb interface
1253 */
1254
1255 static struct usb_driver usb_audio_driver = {
1256 .name = "snd-usb-audio",
1257 .probe = usb_audio_probe,
1258 .disconnect = usb_audio_disconnect,
1259 .suspend = usb_audio_suspend,
1260 .resume = usb_audio_resume,
1261 .reset_resume = usb_audio_resume,
1262 .id_table = usb_audio_ids,
1263 .supports_autosuspend = 1,
1264 };
1265
1266 module_usb_driver(usb_audio_driver);
1267