1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * (Tentative) USB Audio Driver for ALSA
5 * Copyright (c) 2002 by Takashi Iwai <tiwai@suse.de>
7 * Many codes borrowed from audio.c by
8 * Alan Cox (alan@lxorguk.ukuu.org.uk)
9 * Thomas Sailer (sailer@ife.ee.ethz.ch)
11 * Audio Class 3.0 support by Ruslan Bilovol <ruslan.bilovol@gmail.com>
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).
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>
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>
59 MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
60 MODULE_DESCRIPTION("USB Audio");
61 MODULE_LICENSE("GPL");
62 MODULE_SUPPORTED_DEVICE("{{Generic,USB Audio}}");
65 static int index
[SNDRV_CARDS
] = SNDRV_DEFAULT_IDX
; /* Index 0-MAX */
66 static char *id
[SNDRV_CARDS
] = SNDRV_DEFAULT_STR
; /* ID for this card */
67 static bool enable
[SNDRV_CARDS
] = SNDRV_DEFAULT_ENABLE_PNP
;/* Enable this card */
68 /* Vendor/product IDs for this card */
69 static int vid
[SNDRV_CARDS
] = { [0 ... (SNDRV_CARDS
-1)] = -1 };
70 static int pid
[SNDRV_CARDS
] = { [0 ... (SNDRV_CARDS
-1)] = -1 };
71 static int device_setup
[SNDRV_CARDS
]; /* device parameter for this card */
72 static bool ignore_ctl_error
;
73 static bool autoclock
= true;
74 static char *quirk_alias
[SNDRV_CARDS
];
76 bool snd_usb_use_vmalloc
= true;
78 module_param_array(index
, int, NULL
, 0444);
79 MODULE_PARM_DESC(index
, "Index value for the USB audio adapter.");
80 module_param_array(id
, charp
, NULL
, 0444);
81 MODULE_PARM_DESC(id
, "ID string for the USB audio adapter.");
82 module_param_array(enable
, bool, NULL
, 0444);
83 MODULE_PARM_DESC(enable
, "Enable USB audio adapter.");
84 module_param_array(vid
, int, NULL
, 0444);
85 MODULE_PARM_DESC(vid
, "Vendor ID for the USB audio device.");
86 module_param_array(pid
, int, NULL
, 0444);
87 MODULE_PARM_DESC(pid
, "Product ID for the USB audio device.");
88 module_param_array(device_setup
, int, NULL
, 0444);
89 MODULE_PARM_DESC(device_setup
, "Specific device setup (if needed).");
90 module_param(ignore_ctl_error
, bool, 0444);
91 MODULE_PARM_DESC(ignore_ctl_error
,
92 "Ignore errors from USB controller for mixer interfaces.");
93 module_param(autoclock
, bool, 0444);
94 MODULE_PARM_DESC(autoclock
, "Enable auto-clock selection for UAC2 devices (default: yes).");
95 module_param_array(quirk_alias
, charp
, NULL
, 0444);
96 MODULE_PARM_DESC(quirk_alias
, "Quirk aliases, e.g. 0123abcd:5678beef.");
97 module_param_named(use_vmalloc
, snd_usb_use_vmalloc
, bool, 0444);
98 MODULE_PARM_DESC(use_vmalloc
, "Use vmalloc for PCM intermediate buffers (default: yes).");
101 * we keep the snd_usb_audio_t instances by ourselves for merging
102 * the all interfaces on the same card as one sound device.
105 static DEFINE_MUTEX(register_mutex
);
106 static struct snd_usb_audio
*usb_chip
[SNDRV_CARDS
];
107 static struct usb_driver usb_audio_driver
;
111 * called from usb_audio_disconnect()
113 static void snd_usb_stream_disconnect(struct snd_usb_stream
*as
)
116 struct snd_usb_substream
*subs
;
118 for (idx
= 0; idx
< 2; idx
++) {
119 subs
= &as
->substream
[idx
];
120 if (!subs
->num_formats
)
122 subs
->interface
= -1;
123 subs
->data_endpoint
= NULL
;
124 subs
->sync_endpoint
= NULL
;
128 static int snd_usb_create_stream(struct snd_usb_audio
*chip
, int ctrlif
, int interface
)
130 struct usb_device
*dev
= chip
->dev
;
131 struct usb_host_interface
*alts
;
132 struct usb_interface_descriptor
*altsd
;
133 struct usb_interface
*iface
= usb_ifnum_to_if(dev
, interface
);
136 dev_err(&dev
->dev
, "%u:%d : does not exist\n",
141 alts
= &iface
->altsetting
[0];
142 altsd
= get_iface_desc(alts
);
145 * Android with both accessory and audio interfaces enabled gets the
146 * interface numbers wrong.
148 if ((chip
->usb_id
== USB_ID(0x18d1, 0x2d04) ||
149 chip
->usb_id
== USB_ID(0x18d1, 0x2d05)) &&
151 altsd
->bInterfaceClass
== USB_CLASS_VENDOR_SPEC
&&
152 altsd
->bInterfaceSubClass
== USB_SUBCLASS_VENDOR_SPEC
) {
154 iface
= usb_ifnum_to_if(dev
, interface
);
157 alts
= &iface
->altsetting
[0];
158 altsd
= get_iface_desc(alts
);
161 if (usb_interface_claimed(iface
)) {
162 dev_dbg(&dev
->dev
, "%d:%d: skipping, already claimed\n",
167 if ((altsd
->bInterfaceClass
== USB_CLASS_AUDIO
||
168 altsd
->bInterfaceClass
== USB_CLASS_VENDOR_SPEC
) &&
169 altsd
->bInterfaceSubClass
== USB_SUBCLASS_MIDISTREAMING
) {
170 int err
= __snd_usbmidi_create(chip
->card
, iface
,
171 &chip
->midi_list
, NULL
,
175 "%u:%d: cannot create sequencer device\n",
179 usb_driver_claim_interface(&usb_audio_driver
, iface
, (void *)-1L);
184 if ((altsd
->bInterfaceClass
!= USB_CLASS_AUDIO
&&
185 altsd
->bInterfaceClass
!= USB_CLASS_VENDOR_SPEC
) ||
186 altsd
->bInterfaceSubClass
!= USB_SUBCLASS_AUDIOSTREAMING
) {
188 "%u:%d: skipping non-supported interface %d\n",
189 ctrlif
, interface
, altsd
->bInterfaceClass
);
190 /* skip non-supported classes */
194 if (snd_usb_get_speed(dev
) == USB_SPEED_LOW
) {
195 dev_err(&dev
->dev
, "low speed audio streaming not supported\n");
199 if (! snd_usb_parse_audio_interface(chip
, interface
)) {
200 usb_set_interface(dev
, interface
, 0); /* reset the current interface */
201 usb_driver_claim_interface(&usb_audio_driver
, iface
, (void *)-1L);
208 * parse audio control descriptor and create pcm/midi streams
210 static int snd_usb_create_streams(struct snd_usb_audio
*chip
, int ctrlif
)
212 struct usb_device
*dev
= chip
->dev
;
213 struct usb_host_interface
*host_iface
;
214 struct usb_interface_descriptor
*altsd
;
217 /* find audiocontrol interface */
218 host_iface
= &usb_ifnum_to_if(dev
, ctrlif
)->altsetting
[0];
219 altsd
= get_iface_desc(host_iface
);
220 protocol
= altsd
->bInterfaceProtocol
;
225 "unknown interface protocol %#02x, assuming v1\n",
229 case UAC_VERSION_1
: {
230 struct uac1_ac_header_descriptor
*h1
;
233 h1
= snd_usb_find_csint_desc(host_iface
->extra
,
234 host_iface
->extralen
,
236 if (!h1
|| h1
->bLength
< sizeof(*h1
)) {
237 dev_err(&dev
->dev
, "cannot find UAC_HEADER\n");
241 rest_bytes
= (void *)(host_iface
->extra
+
242 host_iface
->extralen
) - (void *)h1
;
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");
250 if (rest_bytes
< sizeof(*h1
)) {
251 dev_err(&dev
->dev
, "too short v1 buffer descriptor\n");
255 if (!h1
->bInCollection
) {
256 dev_info(&dev
->dev
, "skipping empty audio interface (v1)\n");
260 if (rest_bytes
< h1
->bLength
) {
261 dev_err(&dev
->dev
, "invalid buffer length (v1)\n");
265 if (h1
->bLength
< sizeof(*h1
) + h1
->bInCollection
) {
266 dev_err(&dev
->dev
, "invalid UAC_HEADER (v1)\n");
270 for (i
= 0; i
< h1
->bInCollection
; i
++)
271 snd_usb_create_stream(chip
, ctrlif
, h1
->baInterfaceNr
[i
]);
277 case UAC_VERSION_3
: {
278 struct usb_interface_assoc_descriptor
*assoc
=
279 usb_ifnum_to_if(dev
, ctrlif
)->intf_assoc
;
283 * Firmware writers cannot count to three. So to find
284 * the IAD on the NuForce UDH-100, also check the next
287 struct usb_interface
*iface
=
288 usb_ifnum_to_if(dev
, ctrlif
+ 1);
291 iface
->intf_assoc
->bFunctionClass
== USB_CLASS_AUDIO
&&
292 iface
->intf_assoc
->bFunctionProtocol
== UAC_VERSION_2
)
293 assoc
= iface
->intf_assoc
;
297 dev_err(&dev
->dev
, "Audio class v2/v3 interfaces need an interface association\n");
301 if (protocol
== UAC_VERSION_3
) {
302 int badd
= assoc
->bFunctionSubClass
;
304 if (badd
!= UAC3_FUNCTION_SUBCLASS_FULL_ADC_3_0
&&
305 (badd
< UAC3_FUNCTION_SUBCLASS_GENERIC_IO
||
306 badd
> UAC3_FUNCTION_SUBCLASS_SPEAKERPHONE
)) {
308 "Unsupported UAC3 BADD profile\n");
312 chip
->badd_profile
= badd
;
315 for (i
= 0; i
< assoc
->bInterfaceCount
; i
++) {
316 int intf
= assoc
->bFirstInterface
+ i
;
319 snd_usb_create_stream(chip
, ctrlif
, intf
);
330 * free the chip instance
332 * here we have to do not much, since pcm and controls are already freed
336 static void snd_usb_audio_free(struct snd_card
*card
)
338 struct snd_usb_audio
*chip
= card
->private_data
;
339 struct snd_usb_endpoint
*ep
, *n
;
341 list_for_each_entry_safe(ep
, n
, &chip
->ep_list
, list
)
342 snd_usb_endpoint_free(ep
);
344 mutex_destroy(&chip
->mutex
);
345 if (!atomic_read(&chip
->shutdown
))
346 dev_set_drvdata(&chip
->dev
->dev
, NULL
);
349 static void usb_audio_make_shortname(struct usb_device
*dev
,
350 struct snd_usb_audio
*chip
,
351 const struct snd_usb_audio_quirk
*quirk
)
353 struct snd_card
*card
= chip
->card
;
355 if (quirk
&& quirk
->product_name
&& *quirk
->product_name
) {
356 strlcpy(card
->shortname
, quirk
->product_name
,
357 sizeof(card
->shortname
));
361 /* retrieve the device string as shortname */
362 if (!dev
->descriptor
.iProduct
||
363 usb_string(dev
, dev
->descriptor
.iProduct
,
364 card
->shortname
, sizeof(card
->shortname
)) <= 0) {
365 /* no name available from anywhere, so use ID */
366 sprintf(card
->shortname
, "USB Device %#04x:%#04x",
367 USB_ID_VENDOR(chip
->usb_id
),
368 USB_ID_PRODUCT(chip
->usb_id
));
371 strim(card
->shortname
);
374 static void usb_audio_make_longname(struct usb_device
*dev
,
375 struct snd_usb_audio
*chip
,
376 const struct snd_usb_audio_quirk
*quirk
)
378 struct snd_card
*card
= chip
->card
;
381 /* shortcut - if any pre-defined string is given, use it */
382 if (quirk
&& quirk
->profile_name
&& *quirk
->profile_name
) {
383 strlcpy(card
->longname
, quirk
->profile_name
,
384 sizeof(card
->longname
));
388 if (quirk
&& quirk
->vendor_name
&& *quirk
->vendor_name
) {
389 len
= strlcpy(card
->longname
, quirk
->vendor_name
, sizeof(card
->longname
));
391 /* retrieve the vendor and device strings as longname */
392 if (dev
->descriptor
.iManufacturer
)
393 len
= usb_string(dev
, dev
->descriptor
.iManufacturer
,
394 card
->longname
, sizeof(card
->longname
));
397 /* we don't really care if there isn't any vendor string */
400 strim(card
->longname
);
402 strlcat(card
->longname
, " ", sizeof(card
->longname
));
405 strlcat(card
->longname
, card
->shortname
, sizeof(card
->longname
));
407 len
= strlcat(card
->longname
, " at ", sizeof(card
->longname
));
409 if (len
< sizeof(card
->longname
))
410 usb_make_path(dev
, card
->longname
+ len
, sizeof(card
->longname
) - len
);
412 switch (snd_usb_get_speed(dev
)) {
414 strlcat(card
->longname
, ", low speed", sizeof(card
->longname
));
417 strlcat(card
->longname
, ", full speed", sizeof(card
->longname
));
420 strlcat(card
->longname
, ", high speed", sizeof(card
->longname
));
422 case USB_SPEED_SUPER
:
423 strlcat(card
->longname
, ", super speed", sizeof(card
->longname
));
425 case USB_SPEED_SUPER_PLUS
:
426 strlcat(card
->longname
, ", super speed plus", sizeof(card
->longname
));
434 * create a chip instance and set its names.
436 static int snd_usb_audio_create(struct usb_interface
*intf
,
437 struct usb_device
*dev
, int idx
,
438 const struct snd_usb_audio_quirk
*quirk
,
440 struct snd_usb_audio
**rchip
)
442 struct snd_card
*card
;
443 struct snd_usb_audio
*chip
;
449 switch (snd_usb_get_speed(dev
)) {
453 case USB_SPEED_WIRELESS
:
454 case USB_SPEED_SUPER
:
455 case USB_SPEED_SUPER_PLUS
:
458 dev_err(&dev
->dev
, "unknown device speed %d\n", snd_usb_get_speed(dev
));
462 err
= snd_card_new(&intf
->dev
, index
[idx
], id
[idx
], THIS_MODULE
,
463 sizeof(*chip
), &card
);
465 dev_err(&dev
->dev
, "cannot create card instance %d\n", idx
);
469 chip
= card
->private_data
;
470 mutex_init(&chip
->mutex
);
471 init_waitqueue_head(&chip
->shutdown_wait
);
475 chip
->setup
= device_setup
[idx
];
476 chip
->autoclock
= autoclock
;
477 atomic_set(&chip
->active
, 1); /* avoid autopm during probing */
478 atomic_set(&chip
->usage_count
, 0);
479 atomic_set(&chip
->shutdown
, 0);
481 chip
->usb_id
= usb_id
;
482 INIT_LIST_HEAD(&chip
->pcm_list
);
483 INIT_LIST_HEAD(&chip
->ep_list
);
484 INIT_LIST_HEAD(&chip
->midi_list
);
485 INIT_LIST_HEAD(&chip
->mixer_list
);
487 card
->private_free
= snd_usb_audio_free
;
489 strcpy(card
->driver
, "USB-Audio");
490 sprintf(component
, "USB%04x:%04x",
491 USB_ID_VENDOR(chip
->usb_id
), USB_ID_PRODUCT(chip
->usb_id
));
492 snd_component_add(card
, component
);
494 usb_audio_make_shortname(dev
, chip
, quirk
);
495 usb_audio_make_longname(dev
, chip
, quirk
);
497 snd_usb_audio_create_proc(chip
);
503 /* look for a matching quirk alias id */
504 static bool get_alias_id(struct usb_device
*dev
, unsigned int *id
)
507 unsigned int src
, dst
;
509 for (i
= 0; i
< ARRAY_SIZE(quirk_alias
); i
++) {
510 if (!quirk_alias
[i
] ||
511 sscanf(quirk_alias
[i
], "%x:%x", &src
, &dst
) != 2 ||
515 "device (%04x:%04x): applying quirk alias %04x:%04x\n",
516 USB_ID_VENDOR(*id
), USB_ID_PRODUCT(*id
),
517 USB_ID_VENDOR(dst
), USB_ID_PRODUCT(dst
));
525 static const struct usb_device_id usb_audio_ids
[]; /* defined below */
527 /* look for the corresponding quirk */
528 static const struct snd_usb_audio_quirk
*
529 get_alias_quirk(struct usb_device
*dev
, unsigned int id
)
531 const struct usb_device_id
*p
;
533 for (p
= usb_audio_ids
; p
->match_flags
; p
++) {
534 /* FIXME: this checks only vendor:product pair in the list */
535 if ((p
->match_flags
& USB_DEVICE_ID_MATCH_DEVICE
) ==
536 USB_DEVICE_ID_MATCH_DEVICE
&&
537 p
->idVendor
== USB_ID_VENDOR(id
) &&
538 p
->idProduct
== USB_ID_PRODUCT(id
))
539 return (const struct snd_usb_audio_quirk
*)p
->driver_info
;
546 * probe the active usb device
548 * note that this can be called multiple times per a device, when it
549 * includes multiple audio control interfaces.
551 * thus we check the usb device pointer and creates the card instance
552 * only at the first time. the successive calls of this function will
553 * append the pcm interface to the corresponding card.
555 static int usb_audio_probe(struct usb_interface
*intf
,
556 const struct usb_device_id
*usb_id
)
558 struct usb_device
*dev
= interface_to_usbdev(intf
);
559 const struct snd_usb_audio_quirk
*quirk
=
560 (const struct snd_usb_audio_quirk
*)usb_id
->driver_info
;
561 struct snd_usb_audio
*chip
;
563 struct usb_host_interface
*alts
;
567 alts
= &intf
->altsetting
[0];
568 ifnum
= get_iface_desc(alts
)->bInterfaceNumber
;
569 id
= USB_ID(le16_to_cpu(dev
->descriptor
.idVendor
),
570 le16_to_cpu(dev
->descriptor
.idProduct
));
571 if (get_alias_id(dev
, &id
))
572 quirk
= get_alias_quirk(dev
, id
);
573 if (quirk
&& quirk
->ifnum
>= 0 && ifnum
!= quirk
->ifnum
)
576 err
= snd_usb_apply_boot_quirk(dev
, intf
, quirk
, id
);
581 * found a config. now register to ALSA
584 /* check whether it's already registered */
586 mutex_lock(®ister_mutex
);
587 for (i
= 0; i
< SNDRV_CARDS
; i
++) {
588 if (usb_chip
[i
] && usb_chip
[i
]->dev
== dev
) {
589 if (atomic_read(&usb_chip
[i
]->shutdown
)) {
590 dev_err(&dev
->dev
, "USB device is in the shutdown state, cannot create a card instance\n");
595 atomic_inc(&chip
->active
); /* avoid autopm */
601 * now look for an empty slot and create a new card instance
603 for (i
= 0; i
< SNDRV_CARDS
; i
++)
605 (vid
[i
] == -1 || vid
[i
] == USB_ID_VENDOR(id
)) &&
606 (pid
[i
] == -1 || pid
[i
] == USB_ID_PRODUCT(id
))) {
608 err
= snd_usb_audio_create(intf
, dev
, i
, quirk
,
612 chip
->pm_intf
= intf
;
614 } else if (vid
[i
] != -1 || pid
[i
] != -1) {
616 "device (%04x:%04x) is disabled\n",
624 dev_err(&dev
->dev
, "no available usb audio device\n");
629 dev_set_drvdata(&dev
->dev
, chip
);
632 * For devices with more than one control interface, we assume the
633 * first contains the audio controls. We might need a more specific
634 * check here in the future.
636 if (!chip
->ctrl_intf
)
637 chip
->ctrl_intf
= alts
;
639 chip
->txfr_quirk
= 0;
640 err
= 1; /* continue */
641 if (quirk
&& quirk
->ifnum
!= QUIRK_NO_INTERFACE
) {
642 /* need some special handlings */
643 err
= snd_usb_create_quirk(chip
, intf
, &usb_audio_driver
, quirk
);
649 /* create normal USB audio interfaces */
650 err
= snd_usb_create_streams(chip
, ifnum
);
653 err
= snd_usb_create_mixer(chip
, ifnum
, ignore_ctl_error
);
658 /* we are allowed to call snd_card_register() many times */
659 err
= snd_card_register(chip
->card
);
663 if (quirk
&& quirk
->shares_media_device
) {
664 /* don't want to fail when snd_media_device_create() fails */
665 snd_media_device_create(chip
, intf
);
668 usb_chip
[chip
->index
] = chip
;
669 chip
->num_interfaces
++;
670 usb_set_intfdata(intf
, chip
);
671 atomic_dec(&chip
->active
);
672 mutex_unlock(®ister_mutex
);
677 /* chip->active is inside the chip->card object,
678 * decrement before memory is possibly returned.
680 atomic_dec(&chip
->active
);
681 if (!chip
->num_interfaces
)
682 snd_card_free(chip
->card
);
684 mutex_unlock(®ister_mutex
);
689 * we need to take care of counter, since disconnection can be called also
690 * many times as well as usb_audio_probe().
692 static void usb_audio_disconnect(struct usb_interface
*intf
)
694 struct snd_usb_audio
*chip
= usb_get_intfdata(intf
);
695 struct snd_card
*card
;
698 if (chip
== (void *)-1L)
703 mutex_lock(®ister_mutex
);
704 if (atomic_inc_return(&chip
->shutdown
) == 1) {
705 struct snd_usb_stream
*as
;
706 struct snd_usb_endpoint
*ep
;
707 struct usb_mixer_interface
*mixer
;
709 /* wait until all pending tasks done;
710 * they are protected by snd_usb_lock_shutdown()
712 wait_event(chip
->shutdown_wait
,
713 !atomic_read(&chip
->usage_count
));
714 snd_card_disconnect(card
);
715 /* release the pcm resources */
716 list_for_each_entry(as
, &chip
->pcm_list
, list
) {
717 snd_usb_stream_disconnect(as
);
719 /* release the endpoint resources */
720 list_for_each_entry(ep
, &chip
->ep_list
, list
) {
721 snd_usb_endpoint_release(ep
);
723 /* release the midi resources */
724 list_for_each(p
, &chip
->midi_list
) {
725 snd_usbmidi_disconnect(p
);
728 * Nice to check quirk && quirk->shares_media_device and
729 * then call the snd_media_device_delete(). Don't have
730 * access to the quirk here. snd_media_device_delete()
731 * accesses mixer_list
733 snd_media_device_delete(chip
);
735 /* release mixer resources */
736 list_for_each_entry(mixer
, &chip
->mixer_list
, list
) {
737 snd_usb_mixer_disconnect(mixer
);
741 chip
->num_interfaces
--;
742 if (chip
->num_interfaces
<= 0) {
743 usb_chip
[chip
->index
] = NULL
;
744 mutex_unlock(®ister_mutex
);
745 snd_card_free_when_closed(card
);
747 mutex_unlock(®ister_mutex
);
751 /* lock the shutdown (disconnect) task and autoresume */
752 int snd_usb_lock_shutdown(struct snd_usb_audio
*chip
)
756 atomic_inc(&chip
->usage_count
);
757 if (atomic_read(&chip
->shutdown
)) {
761 err
= snd_usb_autoresume(chip
);
767 if (atomic_dec_and_test(&chip
->usage_count
))
768 wake_up(&chip
->shutdown_wait
);
772 /* autosuspend and unlock the shutdown */
773 void snd_usb_unlock_shutdown(struct snd_usb_audio
*chip
)
775 snd_usb_autosuspend(chip
);
776 if (atomic_dec_and_test(&chip
->usage_count
))
777 wake_up(&chip
->shutdown_wait
);
782 int snd_usb_autoresume(struct snd_usb_audio
*chip
)
784 if (atomic_read(&chip
->shutdown
))
786 if (atomic_inc_return(&chip
->active
) == 1)
787 return usb_autopm_get_interface(chip
->pm_intf
);
791 void snd_usb_autosuspend(struct snd_usb_audio
*chip
)
793 if (atomic_read(&chip
->shutdown
))
795 if (atomic_dec_and_test(&chip
->active
))
796 usb_autopm_put_interface(chip
->pm_intf
);
799 static int usb_audio_suspend(struct usb_interface
*intf
, pm_message_t message
)
801 struct snd_usb_audio
*chip
= usb_get_intfdata(intf
);
802 struct snd_usb_stream
*as
;
803 struct usb_mixer_interface
*mixer
;
806 if (chip
== (void *)-1L)
809 chip
->autosuspended
= !!PMSG_IS_AUTO(message
);
810 if (!chip
->autosuspended
)
811 snd_power_change_state(chip
->card
, SNDRV_CTL_POWER_D3hot
);
812 if (!chip
->num_suspended_intf
++) {
813 list_for_each_entry(as
, &chip
->pcm_list
, list
) {
814 snd_usb_pcm_suspend(as
);
815 as
->substream
[0].need_setup_ep
=
816 as
->substream
[1].need_setup_ep
= true;
818 list_for_each(p
, &chip
->midi_list
)
819 snd_usbmidi_suspend(p
);
820 list_for_each_entry(mixer
, &chip
->mixer_list
, list
)
821 snd_usb_mixer_suspend(mixer
);
827 static int __usb_audio_resume(struct usb_interface
*intf
, bool reset_resume
)
829 struct snd_usb_audio
*chip
= usb_get_intfdata(intf
);
830 struct snd_usb_stream
*as
;
831 struct usb_mixer_interface
*mixer
;
835 if (chip
== (void *)-1L)
837 if (--chip
->num_suspended_intf
)
840 atomic_inc(&chip
->active
); /* avoid autopm */
842 list_for_each_entry(as
, &chip
->pcm_list
, list
) {
843 err
= snd_usb_pcm_resume(as
);
849 * ALSA leaves material resumption to user space
850 * we just notify and restart the mixers
852 list_for_each_entry(mixer
, &chip
->mixer_list
, list
) {
853 err
= snd_usb_mixer_resume(mixer
, reset_resume
);
858 list_for_each(p
, &chip
->midi_list
) {
859 snd_usbmidi_resume(p
);
862 if (!chip
->autosuspended
)
863 snd_power_change_state(chip
->card
, SNDRV_CTL_POWER_D0
);
864 chip
->autosuspended
= 0;
867 atomic_dec(&chip
->active
); /* allow autopm after this point */
871 static int usb_audio_resume(struct usb_interface
*intf
)
873 return __usb_audio_resume(intf
, false);
876 static int usb_audio_reset_resume(struct usb_interface
*intf
)
878 return __usb_audio_resume(intf
, true);
881 #define usb_audio_suspend NULL
882 #define usb_audio_resume NULL
883 #define usb_audio_reset_resume NULL
884 #endif /* CONFIG_PM */
886 static const struct usb_device_id usb_audio_ids
[] = {
887 #include "quirks-table.h"
888 { .match_flags
= (USB_DEVICE_ID_MATCH_INT_CLASS
| USB_DEVICE_ID_MATCH_INT_SUBCLASS
),
889 .bInterfaceClass
= USB_CLASS_AUDIO
,
890 .bInterfaceSubClass
= USB_SUBCLASS_AUDIOCONTROL
},
891 { } /* Terminating entry */
893 MODULE_DEVICE_TABLE(usb
, usb_audio_ids
);
896 * entry point for linux usb interface
899 static struct usb_driver usb_audio_driver
= {
900 .name
= "snd-usb-audio",
901 .probe
= usb_audio_probe
,
902 .disconnect
= usb_audio_disconnect
,
903 .suspend
= usb_audio_suspend
,
904 .resume
= usb_audio_resume
,
905 .reset_resume
= usb_audio_reset_resume
,
906 .id_table
= usb_audio_ids
,
907 .supports_autosuspend
= 1,
910 module_usb_driver(usb_audio_driver
);