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)
10 * Audio Class 3.0 support by Ruslan Bilovol <ruslan.bilovol@gmail.com>
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.
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.
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
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).
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>
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>
72 MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
73 MODULE_DESCRIPTION("USB Audio");
74 MODULE_LICENSE("GPL");
75 MODULE_SUPPORTED_DEVICE("{{Generic,USB Audio}}");
78 static int index
[SNDRV_CARDS
] = SNDRV_DEFAULT_IDX
; /* Index 0-MAX */
79 static char *id
[SNDRV_CARDS
] = SNDRV_DEFAULT_STR
; /* ID for this card */
80 static bool enable
[SNDRV_CARDS
] = SNDRV_DEFAULT_ENABLE_PNP
;/* Enable this card */
81 /* Vendor/product IDs for this card */
82 static int vid
[SNDRV_CARDS
] = { [0 ... (SNDRV_CARDS
-1)] = -1 };
83 static int pid
[SNDRV_CARDS
] = { [0 ... (SNDRV_CARDS
-1)] = -1 };
84 static int device_setup
[SNDRV_CARDS
]; /* device parameter for this card */
85 static bool ignore_ctl_error
;
86 static bool autoclock
= true;
87 static char *quirk_alias
[SNDRV_CARDS
];
89 bool snd_usb_use_vmalloc
= true;
91 module_param_array(index
, int, NULL
, 0444);
92 MODULE_PARM_DESC(index
, "Index value for the USB audio adapter.");
93 module_param_array(id
, charp
, NULL
, 0444);
94 MODULE_PARM_DESC(id
, "ID string for the USB audio adapter.");
95 module_param_array(enable
, bool, NULL
, 0444);
96 MODULE_PARM_DESC(enable
, "Enable USB audio adapter.");
97 module_param_array(vid
, int, NULL
, 0444);
98 MODULE_PARM_DESC(vid
, "Vendor ID for the USB audio device.");
99 module_param_array(pid
, int, NULL
, 0444);
100 MODULE_PARM_DESC(pid
, "Product ID for the USB audio device.");
101 module_param_array(device_setup
, int, NULL
, 0444);
102 MODULE_PARM_DESC(device_setup
, "Specific device setup (if needed).");
103 module_param(ignore_ctl_error
, bool, 0444);
104 MODULE_PARM_DESC(ignore_ctl_error
,
105 "Ignore errors from USB controller for mixer interfaces.");
106 module_param(autoclock
, bool, 0444);
107 MODULE_PARM_DESC(autoclock
, "Enable auto-clock selection for UAC2 devices (default: yes).");
108 module_param_array(quirk_alias
, charp
, NULL
, 0444);
109 MODULE_PARM_DESC(quirk_alias
, "Quirk aliases, e.g. 0123abcd:5678beef.");
110 module_param_named(use_vmalloc
, snd_usb_use_vmalloc
, bool, 0444);
111 MODULE_PARM_DESC(use_vmalloc
, "Use vmalloc for PCM intermediate buffers (default: yes).");
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.
118 static DEFINE_MUTEX(register_mutex
);
119 static struct snd_usb_audio
*usb_chip
[SNDRV_CARDS
];
120 static struct usb_driver usb_audio_driver
;
124 * called from usb_audio_disconnect()
126 static void snd_usb_stream_disconnect(struct snd_usb_stream
*as
)
129 struct snd_usb_substream
*subs
;
131 for (idx
= 0; idx
< 2; idx
++) {
132 subs
= &as
->substream
[idx
];
133 if (!subs
->num_formats
)
135 subs
->interface
= -1;
136 subs
->data_endpoint
= NULL
;
137 subs
->sync_endpoint
= NULL
;
141 static int snd_usb_create_stream(struct snd_usb_audio
*chip
, int ctrlif
, int interface
)
143 struct usb_device
*dev
= chip
->dev
;
144 struct usb_host_interface
*alts
;
145 struct usb_interface_descriptor
*altsd
;
146 struct usb_interface
*iface
= usb_ifnum_to_if(dev
, interface
);
149 dev_err(&dev
->dev
, "%u:%d : does not exist\n",
154 alts
= &iface
->altsetting
[0];
155 altsd
= get_iface_desc(alts
);
158 * Android with both accessory and audio interfaces enabled gets the
159 * interface numbers wrong.
161 if ((chip
->usb_id
== USB_ID(0x18d1, 0x2d04) ||
162 chip
->usb_id
== USB_ID(0x18d1, 0x2d05)) &&
164 altsd
->bInterfaceClass
== USB_CLASS_VENDOR_SPEC
&&
165 altsd
->bInterfaceSubClass
== USB_SUBCLASS_VENDOR_SPEC
) {
167 iface
= usb_ifnum_to_if(dev
, interface
);
170 alts
= &iface
->altsetting
[0];
171 altsd
= get_iface_desc(alts
);
174 if (usb_interface_claimed(iface
)) {
175 dev_dbg(&dev
->dev
, "%d:%d: skipping, already claimed\n",
180 if ((altsd
->bInterfaceClass
== USB_CLASS_AUDIO
||
181 altsd
->bInterfaceClass
== USB_CLASS_VENDOR_SPEC
) &&
182 altsd
->bInterfaceSubClass
== USB_SUBCLASS_MIDISTREAMING
) {
183 int err
= __snd_usbmidi_create(chip
->card
, iface
,
184 &chip
->midi_list
, NULL
,
188 "%u:%d: cannot create sequencer device\n",
192 usb_driver_claim_interface(&usb_audio_driver
, iface
, (void *)-1L);
197 if ((altsd
->bInterfaceClass
!= USB_CLASS_AUDIO
&&
198 altsd
->bInterfaceClass
!= USB_CLASS_VENDOR_SPEC
) ||
199 altsd
->bInterfaceSubClass
!= USB_SUBCLASS_AUDIOSTREAMING
) {
201 "%u:%d: skipping non-supported interface %d\n",
202 ctrlif
, interface
, altsd
->bInterfaceClass
);
203 /* skip non-supported classes */
207 if (snd_usb_get_speed(dev
) == USB_SPEED_LOW
) {
208 dev_err(&dev
->dev
, "low speed audio streaming not supported\n");
212 if (! snd_usb_parse_audio_interface(chip
, interface
)) {
213 usb_set_interface(dev
, interface
, 0); /* reset the current interface */
214 usb_driver_claim_interface(&usb_audio_driver
, iface
, (void *)-1L);
221 * parse audio control descriptor and create pcm/midi streams
223 static int snd_usb_create_streams(struct snd_usb_audio
*chip
, int ctrlif
)
225 struct usb_device
*dev
= chip
->dev
;
226 struct usb_host_interface
*host_iface
;
227 struct usb_interface_descriptor
*altsd
;
230 /* find audiocontrol interface */
231 host_iface
= &usb_ifnum_to_if(dev
, ctrlif
)->altsetting
[0];
232 altsd
= get_iface_desc(host_iface
);
233 protocol
= altsd
->bInterfaceProtocol
;
238 "unknown interface protocol %#02x, assuming v1\n",
242 case UAC_VERSION_1
: {
243 struct uac1_ac_header_descriptor
*h1
;
246 h1
= snd_usb_find_csint_desc(host_iface
->extra
,
247 host_iface
->extralen
,
250 dev_err(&dev
->dev
, "cannot find UAC_HEADER\n");
254 rest_bytes
= (void *)(host_iface
->extra
+
255 host_iface
->extralen
) - (void *)h1
;
257 /* just to be sure -- this shouldn't hit at all */
258 if (rest_bytes
<= 0) {
259 dev_err(&dev
->dev
, "invalid control header\n");
263 if (rest_bytes
< sizeof(*h1
)) {
264 dev_err(&dev
->dev
, "too short v1 buffer descriptor\n");
268 if (!h1
->bInCollection
) {
269 dev_info(&dev
->dev
, "skipping empty audio interface (v1)\n");
273 if (rest_bytes
< h1
->bLength
) {
274 dev_err(&dev
->dev
, "invalid buffer length (v1)\n");
278 if (h1
->bLength
< sizeof(*h1
) + h1
->bInCollection
) {
279 dev_err(&dev
->dev
, "invalid UAC_HEADER (v1)\n");
283 for (i
= 0; i
< h1
->bInCollection
; i
++)
284 snd_usb_create_stream(chip
, ctrlif
, h1
->baInterfaceNr
[i
]);
290 case UAC_VERSION_3
: {
291 struct usb_interface_assoc_descriptor
*assoc
=
292 usb_ifnum_to_if(dev
, ctrlif
)->intf_assoc
;
296 * Firmware writers cannot count to three. So to find
297 * the IAD on the NuForce UDH-100, also check the next
300 struct usb_interface
*iface
=
301 usb_ifnum_to_if(dev
, ctrlif
+ 1);
304 iface
->intf_assoc
->bFunctionClass
== USB_CLASS_AUDIO
&&
305 iface
->intf_assoc
->bFunctionProtocol
== UAC_VERSION_2
)
306 assoc
= iface
->intf_assoc
;
310 dev_err(&dev
->dev
, "Audio class v2/v3 interfaces need an interface association\n");
314 if (protocol
== UAC_VERSION_3
) {
315 int badd
= assoc
->bFunctionSubClass
;
317 if (badd
!= UAC3_FUNCTION_SUBCLASS_FULL_ADC_3_0
&&
318 (badd
< UAC3_FUNCTION_SUBCLASS_GENERIC_IO
||
319 badd
> UAC3_FUNCTION_SUBCLASS_SPEAKERPHONE
)) {
321 "Unsupported UAC3 BADD profile\n");
325 chip
->badd_profile
= badd
;
328 for (i
= 0; i
< assoc
->bInterfaceCount
; i
++) {
329 int intf
= assoc
->bFirstInterface
+ i
;
332 snd_usb_create_stream(chip
, ctrlif
, intf
);
343 * free the chip instance
345 * here we have to do not much, since pcm and controls are already freed
349 static void snd_usb_audio_free(struct snd_card
*card
)
351 struct snd_usb_audio
*chip
= card
->private_data
;
352 struct snd_usb_endpoint
*ep
, *n
;
354 list_for_each_entry_safe(ep
, n
, &chip
->ep_list
, list
)
355 snd_usb_endpoint_free(ep
);
357 mutex_destroy(&chip
->mutex
);
358 if (!atomic_read(&chip
->shutdown
))
359 dev_set_drvdata(&chip
->dev
->dev
, NULL
);
362 static void usb_audio_make_shortname(struct usb_device
*dev
,
363 struct snd_usb_audio
*chip
,
364 const struct snd_usb_audio_quirk
*quirk
)
366 struct snd_card
*card
= chip
->card
;
368 if (quirk
&& quirk
->product_name
&& *quirk
->product_name
) {
369 strlcpy(card
->shortname
, quirk
->product_name
,
370 sizeof(card
->shortname
));
374 /* retrieve the device string as shortname */
375 if (!dev
->descriptor
.iProduct
||
376 usb_string(dev
, dev
->descriptor
.iProduct
,
377 card
->shortname
, sizeof(card
->shortname
)) <= 0) {
378 /* no name available from anywhere, so use ID */
379 sprintf(card
->shortname
, "USB Device %#04x:%#04x",
380 USB_ID_VENDOR(chip
->usb_id
),
381 USB_ID_PRODUCT(chip
->usb_id
));
384 strim(card
->shortname
);
387 static void usb_audio_make_longname(struct usb_device
*dev
,
388 struct snd_usb_audio
*chip
,
389 const struct snd_usb_audio_quirk
*quirk
)
391 struct snd_card
*card
= chip
->card
;
394 /* shortcut - if any pre-defined string is given, use it */
395 if (quirk
&& quirk
->profile_name
&& *quirk
->profile_name
) {
396 strlcpy(card
->longname
, quirk
->profile_name
,
397 sizeof(card
->longname
));
401 if (quirk
&& quirk
->vendor_name
&& *quirk
->vendor_name
) {
402 len
= strlcpy(card
->longname
, quirk
->vendor_name
, sizeof(card
->longname
));
404 /* retrieve the vendor and device strings as longname */
405 if (dev
->descriptor
.iManufacturer
)
406 len
= usb_string(dev
, dev
->descriptor
.iManufacturer
,
407 card
->longname
, sizeof(card
->longname
));
410 /* we don't really care if there isn't any vendor string */
413 strim(card
->longname
);
415 strlcat(card
->longname
, " ", sizeof(card
->longname
));
418 strlcat(card
->longname
, card
->shortname
, sizeof(card
->longname
));
420 len
= strlcat(card
->longname
, " at ", sizeof(card
->longname
));
422 if (len
< sizeof(card
->longname
))
423 usb_make_path(dev
, card
->longname
+ len
, sizeof(card
->longname
) - len
);
425 switch (snd_usb_get_speed(dev
)) {
427 strlcat(card
->longname
, ", low speed", sizeof(card
->longname
));
430 strlcat(card
->longname
, ", full speed", sizeof(card
->longname
));
433 strlcat(card
->longname
, ", high speed", sizeof(card
->longname
));
435 case USB_SPEED_SUPER
:
436 strlcat(card
->longname
, ", super speed", sizeof(card
->longname
));
438 case USB_SPEED_SUPER_PLUS
:
439 strlcat(card
->longname
, ", super speed plus", sizeof(card
->longname
));
447 * create a chip instance and set its names.
449 static int snd_usb_audio_create(struct usb_interface
*intf
,
450 struct usb_device
*dev
, int idx
,
451 const struct snd_usb_audio_quirk
*quirk
,
453 struct snd_usb_audio
**rchip
)
455 struct snd_card
*card
;
456 struct snd_usb_audio
*chip
;
462 switch (snd_usb_get_speed(dev
)) {
466 case USB_SPEED_WIRELESS
:
467 case USB_SPEED_SUPER
:
468 case USB_SPEED_SUPER_PLUS
:
471 dev_err(&dev
->dev
, "unknown device speed %d\n", snd_usb_get_speed(dev
));
475 err
= snd_card_new(&intf
->dev
, index
[idx
], id
[idx
], THIS_MODULE
,
476 sizeof(*chip
), &card
);
478 dev_err(&dev
->dev
, "cannot create card instance %d\n", idx
);
482 chip
= card
->private_data
;
483 mutex_init(&chip
->mutex
);
484 init_waitqueue_head(&chip
->shutdown_wait
);
488 chip
->setup
= device_setup
[idx
];
489 chip
->autoclock
= autoclock
;
490 atomic_set(&chip
->active
, 1); /* avoid autopm during probing */
491 atomic_set(&chip
->usage_count
, 0);
492 atomic_set(&chip
->shutdown
, 0);
494 chip
->usb_id
= usb_id
;
495 INIT_LIST_HEAD(&chip
->pcm_list
);
496 INIT_LIST_HEAD(&chip
->ep_list
);
497 INIT_LIST_HEAD(&chip
->midi_list
);
498 INIT_LIST_HEAD(&chip
->mixer_list
);
500 card
->private_free
= snd_usb_audio_free
;
502 strcpy(card
->driver
, "USB-Audio");
503 sprintf(component
, "USB%04x:%04x",
504 USB_ID_VENDOR(chip
->usb_id
), USB_ID_PRODUCT(chip
->usb_id
));
505 snd_component_add(card
, component
);
507 usb_audio_make_shortname(dev
, chip
, quirk
);
508 usb_audio_make_longname(dev
, chip
, quirk
);
510 snd_usb_audio_create_proc(chip
);
516 /* look for a matching quirk alias id */
517 static bool get_alias_id(struct usb_device
*dev
, unsigned int *id
)
520 unsigned int src
, dst
;
522 for (i
= 0; i
< ARRAY_SIZE(quirk_alias
); i
++) {
523 if (!quirk_alias
[i
] ||
524 sscanf(quirk_alias
[i
], "%x:%x", &src
, &dst
) != 2 ||
528 "device (%04x:%04x): applying quirk alias %04x:%04x\n",
529 USB_ID_VENDOR(*id
), USB_ID_PRODUCT(*id
),
530 USB_ID_VENDOR(dst
), USB_ID_PRODUCT(dst
));
538 static const struct usb_device_id usb_audio_ids
[]; /* defined below */
540 /* look for the corresponding quirk */
541 static const struct snd_usb_audio_quirk
*
542 get_alias_quirk(struct usb_device
*dev
, unsigned int id
)
544 const struct usb_device_id
*p
;
546 for (p
= usb_audio_ids
; p
->match_flags
; p
++) {
547 /* FIXME: this checks only vendor:product pair in the list */
548 if ((p
->match_flags
& USB_DEVICE_ID_MATCH_DEVICE
) ==
549 USB_DEVICE_ID_MATCH_DEVICE
&&
550 p
->idVendor
== USB_ID_VENDOR(id
) &&
551 p
->idProduct
== USB_ID_PRODUCT(id
))
552 return (const struct snd_usb_audio_quirk
*)p
->driver_info
;
559 * probe the active usb device
561 * note that this can be called multiple times per a device, when it
562 * includes multiple audio control interfaces.
564 * thus we check the usb device pointer and creates the card instance
565 * only at the first time. the successive calls of this function will
566 * append the pcm interface to the corresponding card.
568 static int usb_audio_probe(struct usb_interface
*intf
,
569 const struct usb_device_id
*usb_id
)
571 struct usb_device
*dev
= interface_to_usbdev(intf
);
572 const struct snd_usb_audio_quirk
*quirk
=
573 (const struct snd_usb_audio_quirk
*)usb_id
->driver_info
;
574 struct snd_usb_audio
*chip
;
576 struct usb_host_interface
*alts
;
580 alts
= &intf
->altsetting
[0];
581 ifnum
= get_iface_desc(alts
)->bInterfaceNumber
;
582 id
= USB_ID(le16_to_cpu(dev
->descriptor
.idVendor
),
583 le16_to_cpu(dev
->descriptor
.idProduct
));
584 if (get_alias_id(dev
, &id
))
585 quirk
= get_alias_quirk(dev
, id
);
586 if (quirk
&& quirk
->ifnum
>= 0 && ifnum
!= quirk
->ifnum
)
589 err
= snd_usb_apply_boot_quirk(dev
, intf
, quirk
, id
);
594 * found a config. now register to ALSA
597 /* check whether it's already registered */
599 mutex_lock(®ister_mutex
);
600 for (i
= 0; i
< SNDRV_CARDS
; i
++) {
601 if (usb_chip
[i
] && usb_chip
[i
]->dev
== dev
) {
602 if (atomic_read(&usb_chip
[i
]->shutdown
)) {
603 dev_err(&dev
->dev
, "USB device is in the shutdown state, cannot create a card instance\n");
608 atomic_inc(&chip
->active
); /* avoid autopm */
614 * now look for an empty slot and create a new card instance
616 for (i
= 0; i
< SNDRV_CARDS
; i
++)
618 (vid
[i
] == -1 || vid
[i
] == USB_ID_VENDOR(id
)) &&
619 (pid
[i
] == -1 || pid
[i
] == USB_ID_PRODUCT(id
))) {
621 err
= snd_usb_audio_create(intf
, dev
, i
, quirk
,
625 chip
->pm_intf
= intf
;
627 } else if (vid
[i
] != -1 || pid
[i
] != -1) {
629 "device (%04x:%04x) is disabled\n",
637 dev_err(&dev
->dev
, "no available usb audio device\n");
642 dev_set_drvdata(&dev
->dev
, chip
);
645 * For devices with more than one control interface, we assume the
646 * first contains the audio controls. We might need a more specific
647 * check here in the future.
649 if (!chip
->ctrl_intf
)
650 chip
->ctrl_intf
= alts
;
652 chip
->txfr_quirk
= 0;
653 err
= 1; /* continue */
654 if (quirk
&& quirk
->ifnum
!= QUIRK_NO_INTERFACE
) {
655 /* need some special handlings */
656 err
= snd_usb_create_quirk(chip
, intf
, &usb_audio_driver
, quirk
);
662 /* create normal USB audio interfaces */
663 err
= snd_usb_create_streams(chip
, ifnum
);
666 err
= snd_usb_create_mixer(chip
, ifnum
, ignore_ctl_error
);
671 /* we are allowed to call snd_card_register() many times */
672 err
= snd_card_register(chip
->card
);
676 usb_chip
[chip
->index
] = chip
;
677 chip
->num_interfaces
++;
678 usb_set_intfdata(intf
, chip
);
679 atomic_dec(&chip
->active
);
680 mutex_unlock(®ister_mutex
);
685 if (!chip
->num_interfaces
)
686 snd_card_free(chip
->card
);
687 atomic_dec(&chip
->active
);
689 mutex_unlock(®ister_mutex
);
694 * we need to take care of counter, since disconnection can be called also
695 * many times as well as usb_audio_probe().
697 static void usb_audio_disconnect(struct usb_interface
*intf
)
699 struct snd_usb_audio
*chip
= usb_get_intfdata(intf
);
700 struct snd_card
*card
;
703 if (chip
== (void *)-1L)
708 mutex_lock(®ister_mutex
);
709 if (atomic_inc_return(&chip
->shutdown
) == 1) {
710 struct snd_usb_stream
*as
;
711 struct snd_usb_endpoint
*ep
;
712 struct usb_mixer_interface
*mixer
;
714 /* wait until all pending tasks done;
715 * they are protected by snd_usb_lock_shutdown()
717 wait_event(chip
->shutdown_wait
,
718 !atomic_read(&chip
->usage_count
));
719 snd_card_disconnect(card
);
720 /* release the pcm resources */
721 list_for_each_entry(as
, &chip
->pcm_list
, list
) {
722 snd_usb_stream_disconnect(as
);
724 /* release the endpoint resources */
725 list_for_each_entry(ep
, &chip
->ep_list
, list
) {
726 snd_usb_endpoint_release(ep
);
728 /* release the midi resources */
729 list_for_each(p
, &chip
->midi_list
) {
730 snd_usbmidi_disconnect(p
);
732 /* release mixer resources */
733 list_for_each_entry(mixer
, &chip
->mixer_list
, list
) {
734 snd_usb_mixer_disconnect(mixer
);
738 chip
->num_interfaces
--;
739 if (chip
->num_interfaces
<= 0) {
740 usb_chip
[chip
->index
] = NULL
;
741 mutex_unlock(®ister_mutex
);
742 snd_card_free_when_closed(card
);
744 mutex_unlock(®ister_mutex
);
748 /* lock the shutdown (disconnect) task and autoresume */
749 int snd_usb_lock_shutdown(struct snd_usb_audio
*chip
)
753 atomic_inc(&chip
->usage_count
);
754 if (atomic_read(&chip
->shutdown
)) {
758 err
= snd_usb_autoresume(chip
);
764 if (atomic_dec_and_test(&chip
->usage_count
))
765 wake_up(&chip
->shutdown_wait
);
769 /* autosuspend and unlock the shutdown */
770 void snd_usb_unlock_shutdown(struct snd_usb_audio
*chip
)
772 snd_usb_autosuspend(chip
);
773 if (atomic_dec_and_test(&chip
->usage_count
))
774 wake_up(&chip
->shutdown_wait
);
779 int snd_usb_autoresume(struct snd_usb_audio
*chip
)
781 if (atomic_read(&chip
->shutdown
))
783 if (atomic_inc_return(&chip
->active
) == 1)
784 return usb_autopm_get_interface(chip
->pm_intf
);
788 void snd_usb_autosuspend(struct snd_usb_audio
*chip
)
790 if (atomic_read(&chip
->shutdown
))
792 if (atomic_dec_and_test(&chip
->active
))
793 usb_autopm_put_interface(chip
->pm_intf
);
796 static int usb_audio_suspend(struct usb_interface
*intf
, pm_message_t message
)
798 struct snd_usb_audio
*chip
= usb_get_intfdata(intf
);
799 struct snd_usb_stream
*as
;
800 struct usb_mixer_interface
*mixer
;
803 if (chip
== (void *)-1L)
806 chip
->autosuspended
= !!PMSG_IS_AUTO(message
);
807 if (!chip
->autosuspended
)
808 snd_power_change_state(chip
->card
, SNDRV_CTL_POWER_D3hot
);
809 if (!chip
->num_suspended_intf
++) {
810 list_for_each_entry(as
, &chip
->pcm_list
, list
) {
811 snd_pcm_suspend_all(as
->pcm
);
812 as
->substream
[0].need_setup_ep
=
813 as
->substream
[1].need_setup_ep
= true;
815 list_for_each(p
, &chip
->midi_list
)
816 snd_usbmidi_suspend(p
);
817 list_for_each_entry(mixer
, &chip
->mixer_list
, list
)
818 snd_usb_mixer_suspend(mixer
);
824 static int __usb_audio_resume(struct usb_interface
*intf
, bool reset_resume
)
826 struct snd_usb_audio
*chip
= usb_get_intfdata(intf
);
827 struct usb_mixer_interface
*mixer
;
831 if (chip
== (void *)-1L)
833 if (--chip
->num_suspended_intf
)
836 atomic_inc(&chip
->active
); /* avoid autopm */
838 * ALSA leaves material resumption to user space
839 * we just notify and restart the mixers
841 list_for_each_entry(mixer
, &chip
->mixer_list
, list
) {
842 err
= snd_usb_mixer_resume(mixer
, reset_resume
);
847 list_for_each(p
, &chip
->midi_list
) {
848 snd_usbmidi_resume(p
);
851 if (!chip
->autosuspended
)
852 snd_power_change_state(chip
->card
, SNDRV_CTL_POWER_D0
);
853 chip
->autosuspended
= 0;
856 atomic_dec(&chip
->active
); /* allow autopm after this point */
860 static int usb_audio_resume(struct usb_interface
*intf
)
862 return __usb_audio_resume(intf
, false);
865 static int usb_audio_reset_resume(struct usb_interface
*intf
)
867 return __usb_audio_resume(intf
, true);
870 #define usb_audio_suspend NULL
871 #define usb_audio_resume NULL
872 #define usb_audio_reset_resume NULL
873 #endif /* CONFIG_PM */
875 static const struct usb_device_id usb_audio_ids
[] = {
876 #include "quirks-table.h"
877 { .match_flags
= (USB_DEVICE_ID_MATCH_INT_CLASS
| USB_DEVICE_ID_MATCH_INT_SUBCLASS
),
878 .bInterfaceClass
= USB_CLASS_AUDIO
,
879 .bInterfaceSubClass
= USB_SUBCLASS_AUDIOCONTROL
},
880 { } /* Terminating entry */
882 MODULE_DEVICE_TABLE(usb
, usb_audio_ids
);
885 * entry point for linux usb interface
888 static struct usb_driver usb_audio_driver
= {
889 .name
= "snd-usb-audio",
890 .probe
= usb_audio_probe
,
891 .disconnect
= usb_audio_disconnect
,
892 .suspend
= usb_audio_suspend
,
893 .resume
= usb_audio_resume
,
894 .reset_resume
= usb_audio_reset_resume
,
895 .id_table
= usb_audio_ids
,
896 .supports_autosuspend
= 1,
899 module_usb_driver(usb_audio_driver
);