2 * (Tentative) USB Audio Driver for ALSA
4 * Copyright (c) 2002 by Takashi Iwai <tiwai@suse.de>
6 * Many codes borrowed from audio.c by
7 * Alan Cox (alan@lxorguk.ukuu.org.uk)
8 * Thomas Sailer (sailer@ife.ee.ethz.ch)
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
28 * - the linked URBs would be preferred but not used so far because of
29 * the instability of unlinking.
30 * - type II is not supported properly. there is no device which supports
31 * this type *correctly*. SB extigy looks as if it supports, but it's
32 * indeed an AC3 stream packed in SPDIF frames (i.e. no real AC3 stream).
36 #include <linux/bitops.h>
37 #include <linux/init.h>
38 #include <linux/list.h>
39 #include <linux/slab.h>
40 #include <linux/string.h>
41 #include <linux/ctype.h>
42 #include <linux/usb.h>
43 #include <linux/moduleparam.h>
44 #include <linux/mutex.h>
45 #include <linux/usb/audio.h>
46 #include <linux/usb/audio-v2.h>
47 #include <linux/module.h>
49 #include <sound/control.h>
50 #include <sound/core.h>
51 #include <sound/info.h>
52 #include <sound/pcm.h>
53 #include <sound/pcm_params.h>
54 #include <sound/initval.h>
70 MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
71 MODULE_DESCRIPTION("USB Audio");
72 MODULE_LICENSE("GPL");
73 MODULE_SUPPORTED_DEVICE("{{Generic,USB Audio}}");
76 static int index
[SNDRV_CARDS
] = SNDRV_DEFAULT_IDX
; /* Index 0-MAX */
77 static char *id
[SNDRV_CARDS
] = SNDRV_DEFAULT_STR
; /* ID for this card */
78 static bool enable
[SNDRV_CARDS
] = SNDRV_DEFAULT_ENABLE_PNP
;/* Enable this card */
79 /* Vendor/product IDs for this card */
80 static int vid
[SNDRV_CARDS
] = { [0 ... (SNDRV_CARDS
-1)] = -1 };
81 static int pid
[SNDRV_CARDS
] = { [0 ... (SNDRV_CARDS
-1)] = -1 };
82 static int device_setup
[SNDRV_CARDS
]; /* device parameter for this card */
83 static bool ignore_ctl_error
;
84 static bool autoclock
= true;
85 static char *quirk_alias
[SNDRV_CARDS
];
87 module_param_array(index
, int, NULL
, 0444);
88 MODULE_PARM_DESC(index
, "Index value for the USB audio adapter.");
89 module_param_array(id
, charp
, NULL
, 0444);
90 MODULE_PARM_DESC(id
, "ID string for the USB audio adapter.");
91 module_param_array(enable
, bool, NULL
, 0444);
92 MODULE_PARM_DESC(enable
, "Enable USB audio adapter.");
93 module_param_array(vid
, int, NULL
, 0444);
94 MODULE_PARM_DESC(vid
, "Vendor ID for the USB audio device.");
95 module_param_array(pid
, int, NULL
, 0444);
96 MODULE_PARM_DESC(pid
, "Product ID for the USB audio device.");
97 module_param_array(device_setup
, int, NULL
, 0444);
98 MODULE_PARM_DESC(device_setup
, "Specific device setup (if needed).");
99 module_param(ignore_ctl_error
, bool, 0444);
100 MODULE_PARM_DESC(ignore_ctl_error
,
101 "Ignore errors from USB controller for mixer interfaces.");
102 module_param(autoclock
, bool, 0444);
103 MODULE_PARM_DESC(autoclock
, "Enable auto-clock selection for UAC2 devices (default: yes).");
104 module_param_array(quirk_alias
, charp
, NULL
, 0444);
105 MODULE_PARM_DESC(quirk_alias
, "Quirk aliases, e.g. 0123abcd:5678beef.");
108 * we keep the snd_usb_audio_t instances by ourselves for merging
109 * the all interfaces on the same card as one sound device.
112 static DEFINE_MUTEX(register_mutex
);
113 static struct snd_usb_audio
*usb_chip
[SNDRV_CARDS
];
114 static struct usb_driver usb_audio_driver
;
118 * called from usb_audio_disconnect()
120 static void snd_usb_stream_disconnect(struct snd_usb_stream
*as
)
123 struct snd_usb_substream
*subs
;
125 for (idx
= 0; idx
< 2; idx
++) {
126 subs
= &as
->substream
[idx
];
127 if (!subs
->num_formats
)
129 subs
->interface
= -1;
130 subs
->data_endpoint
= NULL
;
131 subs
->sync_endpoint
= NULL
;
135 static int snd_usb_create_stream(struct snd_usb_audio
*chip
, int ctrlif
, int interface
)
137 struct usb_device
*dev
= chip
->dev
;
138 struct usb_host_interface
*alts
;
139 struct usb_interface_descriptor
*altsd
;
140 struct usb_interface
*iface
= usb_ifnum_to_if(dev
, interface
);
143 dev_err(&dev
->dev
, "%u:%d : does not exist\n",
148 alts
= &iface
->altsetting
[0];
149 altsd
= get_iface_desc(alts
);
152 * Android with both accessory and audio interfaces enabled gets the
153 * interface numbers wrong.
155 if ((chip
->usb_id
== USB_ID(0x18d1, 0x2d04) ||
156 chip
->usb_id
== USB_ID(0x18d1, 0x2d05)) &&
158 altsd
->bInterfaceClass
== USB_CLASS_VENDOR_SPEC
&&
159 altsd
->bInterfaceSubClass
== USB_SUBCLASS_VENDOR_SPEC
) {
161 iface
= usb_ifnum_to_if(dev
, interface
);
164 alts
= &iface
->altsetting
[0];
165 altsd
= get_iface_desc(alts
);
168 if (usb_interface_claimed(iface
)) {
169 dev_dbg(&dev
->dev
, "%d:%d: skipping, already claimed\n",
174 if ((altsd
->bInterfaceClass
== USB_CLASS_AUDIO
||
175 altsd
->bInterfaceClass
== USB_CLASS_VENDOR_SPEC
) &&
176 altsd
->bInterfaceSubClass
== USB_SUBCLASS_MIDISTREAMING
) {
177 int err
= __snd_usbmidi_create(chip
->card
, iface
,
178 &chip
->midi_list
, NULL
,
182 "%u:%d: cannot create sequencer device\n",
186 usb_driver_claim_interface(&usb_audio_driver
, iface
, (void *)-1L);
191 if ((altsd
->bInterfaceClass
!= USB_CLASS_AUDIO
&&
192 altsd
->bInterfaceClass
!= USB_CLASS_VENDOR_SPEC
) ||
193 altsd
->bInterfaceSubClass
!= USB_SUBCLASS_AUDIOSTREAMING
) {
195 "%u:%d: skipping non-supported interface %d\n",
196 ctrlif
, interface
, altsd
->bInterfaceClass
);
197 /* skip non-supported classes */
201 if (snd_usb_get_speed(dev
) == USB_SPEED_LOW
) {
202 dev_err(&dev
->dev
, "low speed audio streaming not supported\n");
206 if (! snd_usb_parse_audio_interface(chip
, interface
)) {
207 usb_set_interface(dev
, interface
, 0); /* reset the current interface */
208 usb_driver_claim_interface(&usb_audio_driver
, iface
, (void *)-1L);
216 * parse audio control descriptor and create pcm/midi streams
218 static int snd_usb_create_streams(struct snd_usb_audio
*chip
, int ctrlif
)
220 struct usb_device
*dev
= chip
->dev
;
221 struct usb_host_interface
*host_iface
;
222 struct usb_interface_descriptor
*altsd
;
223 void *control_header
;
226 /* find audiocontrol interface */
227 host_iface
= &usb_ifnum_to_if(dev
, ctrlif
)->altsetting
[0];
228 control_header
= snd_usb_find_csint_desc(host_iface
->extra
,
229 host_iface
->extralen
,
231 altsd
= get_iface_desc(host_iface
);
232 protocol
= altsd
->bInterfaceProtocol
;
234 if (!control_header
) {
235 dev_err(&dev
->dev
, "cannot find UAC_HEADER\n");
242 "unknown interface protocol %#02x, assuming v1\n",
246 case UAC_VERSION_1
: {
247 struct uac1_ac_header_descriptor
*h1
= control_header
;
249 if (!h1
->bInCollection
) {
250 dev_info(&dev
->dev
, "skipping empty audio interface (v1)\n");
254 if (h1
->bLength
< sizeof(*h1
) + h1
->bInCollection
) {
255 dev_err(&dev
->dev
, "invalid UAC_HEADER (v1)\n");
259 for (i
= 0; i
< h1
->bInCollection
; i
++)
260 snd_usb_create_stream(chip
, ctrlif
, h1
->baInterfaceNr
[i
]);
265 case UAC_VERSION_2
: {
266 struct usb_interface_assoc_descriptor
*assoc
=
267 usb_ifnum_to_if(dev
, ctrlif
)->intf_assoc
;
271 * Firmware writers cannot count to three. So to find
272 * the IAD on the NuForce UDH-100, also check the next
275 struct usb_interface
*iface
=
276 usb_ifnum_to_if(dev
, ctrlif
+ 1);
279 iface
->intf_assoc
->bFunctionClass
== USB_CLASS_AUDIO
&&
280 iface
->intf_assoc
->bFunctionProtocol
== UAC_VERSION_2
)
281 assoc
= iface
->intf_assoc
;
285 dev_err(&dev
->dev
, "Audio class v2 interfaces need an interface association\n");
289 for (i
= 0; i
< assoc
->bInterfaceCount
; i
++) {
290 int intf
= assoc
->bFirstInterface
+ i
;
293 snd_usb_create_stream(chip
, ctrlif
, intf
);
304 * free the chip instance
306 * here we have to do not much, since pcm and controls are already freed
310 static int snd_usb_audio_free(struct snd_usb_audio
*chip
)
312 struct snd_usb_endpoint
*ep
, *n
;
314 list_for_each_entry_safe(ep
, n
, &chip
->ep_list
, list
)
315 snd_usb_endpoint_free(ep
);
317 mutex_destroy(&chip
->mutex
);
318 if (!atomic_read(&chip
->shutdown
))
319 dev_set_drvdata(&chip
->dev
->dev
, NULL
);
324 static int snd_usb_audio_dev_free(struct snd_device
*device
)
326 struct snd_usb_audio
*chip
= device
->device_data
;
327 return snd_usb_audio_free(chip
);
331 * create a chip instance and set its names.
333 static int snd_usb_audio_create(struct usb_interface
*intf
,
334 struct usb_device
*dev
, int idx
,
335 const struct snd_usb_audio_quirk
*quirk
,
336 struct snd_usb_audio
**rchip
)
338 struct snd_card
*card
;
339 struct snd_usb_audio
*chip
;
342 static struct snd_device_ops ops
= {
343 .dev_free
= snd_usb_audio_dev_free
,
348 switch (snd_usb_get_speed(dev
)) {
352 case USB_SPEED_WIRELESS
:
353 case USB_SPEED_SUPER
:
354 case USB_SPEED_SUPER_PLUS
:
357 dev_err(&dev
->dev
, "unknown device speed %d\n", snd_usb_get_speed(dev
));
361 err
= snd_card_new(&intf
->dev
, index
[idx
], id
[idx
], THIS_MODULE
,
364 dev_err(&dev
->dev
, "cannot create card instance %d\n", idx
);
368 chip
= kzalloc(sizeof(*chip
), GFP_KERNEL
);
374 mutex_init(&chip
->mutex
);
375 init_waitqueue_head(&chip
->shutdown_wait
);
379 chip
->setup
= device_setup
[idx
];
380 chip
->autoclock
= autoclock
;
381 atomic_set(&chip
->active
, 1); /* avoid autopm during probing */
382 atomic_set(&chip
->usage_count
, 0);
383 atomic_set(&chip
->shutdown
, 0);
385 chip
->usb_id
= USB_ID(le16_to_cpu(dev
->descriptor
.idVendor
),
386 le16_to_cpu(dev
->descriptor
.idProduct
));
387 INIT_LIST_HEAD(&chip
->pcm_list
);
388 INIT_LIST_HEAD(&chip
->ep_list
);
389 INIT_LIST_HEAD(&chip
->midi_list
);
390 INIT_LIST_HEAD(&chip
->mixer_list
);
392 if ((err
= snd_device_new(card
, SNDRV_DEV_LOWLEVEL
, chip
, &ops
)) < 0) {
393 snd_usb_audio_free(chip
);
398 strcpy(card
->driver
, "USB-Audio");
399 sprintf(component
, "USB%04x:%04x",
400 USB_ID_VENDOR(chip
->usb_id
), USB_ID_PRODUCT(chip
->usb_id
));
401 snd_component_add(card
, component
);
403 /* retrieve the device string as shortname */
404 if (quirk
&& quirk
->product_name
&& *quirk
->product_name
) {
405 strlcpy(card
->shortname
, quirk
->product_name
, sizeof(card
->shortname
));
407 if (!dev
->descriptor
.iProduct
||
408 usb_string(dev
, dev
->descriptor
.iProduct
,
409 card
->shortname
, sizeof(card
->shortname
)) <= 0) {
410 /* no name available from anywhere, so use ID */
411 sprintf(card
->shortname
, "USB Device %#04x:%#04x",
412 USB_ID_VENDOR(chip
->usb_id
),
413 USB_ID_PRODUCT(chip
->usb_id
));
416 strim(card
->shortname
);
418 /* retrieve the vendor and device strings as longname */
419 if (quirk
&& quirk
->vendor_name
&& *quirk
->vendor_name
) {
420 len
= strlcpy(card
->longname
, quirk
->vendor_name
, sizeof(card
->longname
));
422 if (dev
->descriptor
.iManufacturer
)
423 len
= usb_string(dev
, dev
->descriptor
.iManufacturer
,
424 card
->longname
, sizeof(card
->longname
));
427 /* we don't really care if there isn't any vendor string */
430 strim(card
->longname
);
432 strlcat(card
->longname
, " ", sizeof(card
->longname
));
435 strlcat(card
->longname
, card
->shortname
, sizeof(card
->longname
));
437 len
= strlcat(card
->longname
, " at ", sizeof(card
->longname
));
439 if (len
< sizeof(card
->longname
))
440 usb_make_path(dev
, card
->longname
+ len
, sizeof(card
->longname
) - len
);
442 switch (snd_usb_get_speed(dev
)) {
444 strlcat(card
->longname
, ", low speed", sizeof(card
->longname
));
447 strlcat(card
->longname
, ", full speed", sizeof(card
->longname
));
450 strlcat(card
->longname
, ", high speed", sizeof(card
->longname
));
452 case USB_SPEED_SUPER
:
453 strlcat(card
->longname
, ", super speed", sizeof(card
->longname
));
455 case USB_SPEED_SUPER_PLUS
:
456 strlcat(card
->longname
, ", super speed plus", sizeof(card
->longname
));
462 snd_usb_audio_create_proc(chip
);
468 /* look for a matching quirk alias id */
469 static bool get_alias_id(struct usb_device
*dev
, unsigned int *id
)
472 unsigned int src
, dst
;
474 for (i
= 0; i
< ARRAY_SIZE(quirk_alias
); i
++) {
475 if (!quirk_alias
[i
] ||
476 sscanf(quirk_alias
[i
], "%x:%x", &src
, &dst
) != 2 ||
480 "device (%04x:%04x): applying quirk alias %04x:%04x\n",
481 USB_ID_VENDOR(*id
), USB_ID_PRODUCT(*id
),
482 USB_ID_VENDOR(dst
), USB_ID_PRODUCT(dst
));
490 static struct usb_device_id usb_audio_ids
[]; /* defined below */
492 /* look for the corresponding quirk */
493 static const struct snd_usb_audio_quirk
*
494 get_alias_quirk(struct usb_device
*dev
, unsigned int id
)
496 const struct usb_device_id
*p
;
498 for (p
= usb_audio_ids
; p
->match_flags
; p
++) {
499 /* FIXME: this checks only vendor:product pair in the list */
500 if ((p
->match_flags
& USB_DEVICE_ID_MATCH_DEVICE
) ==
501 USB_DEVICE_ID_MATCH_DEVICE
&&
502 p
->idVendor
== USB_ID_VENDOR(id
) &&
503 p
->idProduct
== USB_ID_PRODUCT(id
))
504 return (const struct snd_usb_audio_quirk
*)p
->driver_info
;
511 * probe the active usb device
513 * note that this can be called multiple times per a device, when it
514 * includes multiple audio control interfaces.
516 * thus we check the usb device pointer and creates the card instance
517 * only at the first time. the successive calls of this function will
518 * append the pcm interface to the corresponding card.
520 static int usb_audio_probe(struct usb_interface
*intf
,
521 const struct usb_device_id
*usb_id
)
523 struct usb_device
*dev
= interface_to_usbdev(intf
);
524 const struct snd_usb_audio_quirk
*quirk
=
525 (const struct snd_usb_audio_quirk
*)usb_id
->driver_info
;
526 struct snd_usb_audio
*chip
;
528 struct usb_host_interface
*alts
;
532 alts
= &intf
->altsetting
[0];
533 ifnum
= get_iface_desc(alts
)->bInterfaceNumber
;
534 id
= USB_ID(le16_to_cpu(dev
->descriptor
.idVendor
),
535 le16_to_cpu(dev
->descriptor
.idProduct
));
536 if (get_alias_id(dev
, &id
))
537 quirk
= get_alias_quirk(dev
, id
);
538 if (quirk
&& quirk
->ifnum
>= 0 && ifnum
!= quirk
->ifnum
)
541 err
= snd_usb_apply_boot_quirk(dev
, intf
, quirk
, id
);
546 * found a config. now register to ALSA
549 /* check whether it's already registered */
551 mutex_lock(®ister_mutex
);
552 for (i
= 0; i
< SNDRV_CARDS
; i
++) {
553 if (usb_chip
[i
] && usb_chip
[i
]->dev
== dev
) {
554 if (atomic_read(&usb_chip
[i
]->shutdown
)) {
555 dev_err(&dev
->dev
, "USB device is in the shutdown state, cannot create a card instance\n");
560 atomic_inc(&chip
->active
); /* avoid autopm */
566 * now look for an empty slot and create a new card instance
568 for (i
= 0; i
< SNDRV_CARDS
; i
++)
569 if (enable
[i
] && ! usb_chip
[i
] &&
570 (vid
[i
] == -1 || vid
[i
] == USB_ID_VENDOR(id
)) &&
571 (pid
[i
] == -1 || pid
[i
] == USB_ID_PRODUCT(id
))) {
572 err
= snd_usb_audio_create(intf
, dev
, i
, quirk
,
576 chip
->pm_intf
= intf
;
580 dev_err(&dev
->dev
, "no available usb audio device\n");
585 dev_set_drvdata(&dev
->dev
, chip
);
588 * For devices with more than one control interface, we assume the
589 * first contains the audio controls. We might need a more specific
590 * check here in the future.
592 if (!chip
->ctrl_intf
)
593 chip
->ctrl_intf
= alts
;
595 chip
->txfr_quirk
= 0;
596 err
= 1; /* continue */
597 if (quirk
&& quirk
->ifnum
!= QUIRK_NO_INTERFACE
) {
598 /* need some special handlings */
599 err
= snd_usb_create_quirk(chip
, intf
, &usb_audio_driver
, quirk
);
605 /* create normal USB audio interfaces */
606 err
= snd_usb_create_streams(chip
, ifnum
);
609 err
= snd_usb_create_mixer(chip
, ifnum
, ignore_ctl_error
);
614 /* we are allowed to call snd_card_register() many times */
615 err
= snd_card_register(chip
->card
);
619 usb_chip
[chip
->index
] = chip
;
620 chip
->num_interfaces
++;
621 usb_set_intfdata(intf
, chip
);
622 atomic_dec(&chip
->active
);
623 mutex_unlock(®ister_mutex
);
628 if (!chip
->num_interfaces
)
629 snd_card_free(chip
->card
);
630 atomic_dec(&chip
->active
);
632 mutex_unlock(®ister_mutex
);
637 * we need to take care of counter, since disconnection can be called also
638 * many times as well as usb_audio_probe().
640 static void usb_audio_disconnect(struct usb_interface
*intf
)
642 struct snd_usb_audio
*chip
= usb_get_intfdata(intf
);
643 struct snd_card
*card
;
646 if (chip
== (void *)-1L)
651 mutex_lock(®ister_mutex
);
652 if (atomic_inc_return(&chip
->shutdown
) == 1) {
653 struct snd_usb_stream
*as
;
654 struct snd_usb_endpoint
*ep
;
655 struct usb_mixer_interface
*mixer
;
657 /* wait until all pending tasks done;
658 * they are protected by snd_usb_lock_shutdown()
660 wait_event(chip
->shutdown_wait
,
661 !atomic_read(&chip
->usage_count
));
662 snd_card_disconnect(card
);
663 /* release the pcm resources */
664 list_for_each_entry(as
, &chip
->pcm_list
, list
) {
665 snd_usb_stream_disconnect(as
);
667 /* release the endpoint resources */
668 list_for_each_entry(ep
, &chip
->ep_list
, list
) {
669 snd_usb_endpoint_release(ep
);
671 /* release the midi resources */
672 list_for_each(p
, &chip
->midi_list
) {
673 snd_usbmidi_disconnect(p
);
675 /* release mixer resources */
676 list_for_each_entry(mixer
, &chip
->mixer_list
, list
) {
677 snd_usb_mixer_disconnect(mixer
);
681 chip
->num_interfaces
--;
682 if (chip
->num_interfaces
<= 0) {
683 usb_chip
[chip
->index
] = NULL
;
684 mutex_unlock(®ister_mutex
);
685 snd_card_free_when_closed(card
);
687 mutex_unlock(®ister_mutex
);
691 /* lock the shutdown (disconnect) task and autoresume */
692 int snd_usb_lock_shutdown(struct snd_usb_audio
*chip
)
696 atomic_inc(&chip
->usage_count
);
697 if (atomic_read(&chip
->shutdown
)) {
701 err
= snd_usb_autoresume(chip
);
707 if (atomic_dec_and_test(&chip
->usage_count
))
708 wake_up(&chip
->shutdown_wait
);
712 /* autosuspend and unlock the shutdown */
713 void snd_usb_unlock_shutdown(struct snd_usb_audio
*chip
)
715 snd_usb_autosuspend(chip
);
716 if (atomic_dec_and_test(&chip
->usage_count
))
717 wake_up(&chip
->shutdown_wait
);
722 int snd_usb_autoresume(struct snd_usb_audio
*chip
)
724 if (atomic_read(&chip
->shutdown
))
726 if (atomic_inc_return(&chip
->active
) == 1)
727 return usb_autopm_get_interface(chip
->pm_intf
);
731 void snd_usb_autosuspend(struct snd_usb_audio
*chip
)
733 if (atomic_read(&chip
->shutdown
))
735 if (atomic_dec_and_test(&chip
->active
))
736 usb_autopm_put_interface(chip
->pm_intf
);
739 static int usb_audio_suspend(struct usb_interface
*intf
, pm_message_t message
)
741 struct snd_usb_audio
*chip
= usb_get_intfdata(intf
);
742 struct snd_usb_stream
*as
;
743 struct usb_mixer_interface
*mixer
;
746 if (chip
== (void *)-1L)
749 chip
->autosuspended
= !!PMSG_IS_AUTO(message
);
750 if (!chip
->autosuspended
)
751 snd_power_change_state(chip
->card
, SNDRV_CTL_POWER_D3hot
);
752 if (!chip
->num_suspended_intf
++) {
753 list_for_each_entry(as
, &chip
->pcm_list
, list
) {
754 snd_pcm_suspend_all(as
->pcm
);
755 as
->substream
[0].need_setup_ep
=
756 as
->substream
[1].need_setup_ep
= true;
758 list_for_each(p
, &chip
->midi_list
)
759 snd_usbmidi_suspend(p
);
760 list_for_each_entry(mixer
, &chip
->mixer_list
, list
)
761 snd_usb_mixer_suspend(mixer
);
767 static int __usb_audio_resume(struct usb_interface
*intf
, bool reset_resume
)
769 struct snd_usb_audio
*chip
= usb_get_intfdata(intf
);
770 struct usb_mixer_interface
*mixer
;
774 if (chip
== (void *)-1L)
776 if (--chip
->num_suspended_intf
)
779 atomic_inc(&chip
->active
); /* avoid autopm */
781 * ALSA leaves material resumption to user space
782 * we just notify and restart the mixers
784 list_for_each_entry(mixer
, &chip
->mixer_list
, list
) {
785 err
= snd_usb_mixer_resume(mixer
, reset_resume
);
790 list_for_each(p
, &chip
->midi_list
) {
791 snd_usbmidi_resume(p
);
794 if (!chip
->autosuspended
)
795 snd_power_change_state(chip
->card
, SNDRV_CTL_POWER_D0
);
796 chip
->autosuspended
= 0;
799 atomic_dec(&chip
->active
); /* allow autopm after this point */
803 static int usb_audio_resume(struct usb_interface
*intf
)
805 return __usb_audio_resume(intf
, false);
808 static int usb_audio_reset_resume(struct usb_interface
*intf
)
810 return __usb_audio_resume(intf
, true);
813 #define usb_audio_suspend NULL
814 #define usb_audio_resume NULL
815 #define usb_audio_reset_resume NULL
816 #endif /* CONFIG_PM */
818 static struct usb_device_id usb_audio_ids
[] = {
819 #include "quirks-table.h"
820 { .match_flags
= (USB_DEVICE_ID_MATCH_INT_CLASS
| USB_DEVICE_ID_MATCH_INT_SUBCLASS
),
821 .bInterfaceClass
= USB_CLASS_AUDIO
,
822 .bInterfaceSubClass
= USB_SUBCLASS_AUDIOCONTROL
},
823 { } /* Terminating entry */
825 MODULE_DEVICE_TABLE(usb
, usb_audio_ids
);
828 * entry point for linux usb interface
831 static struct usb_driver usb_audio_driver
= {
832 .name
= "snd-usb-audio",
833 .probe
= usb_audio_probe
,
834 .disconnect
= usb_audio_disconnect
,
835 .suspend
= usb_audio_suspend
,
836 .resume
= usb_audio_resume
,
837 .reset_resume
= usb_audio_reset_resume
,
838 .id_table
= usb_audio_ids
,
839 .supports_autosuspend
= 1,
842 module_usb_driver(usb_audio_driver
);