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4120fbedbb
linux/sound/usb
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Takashi Iwai 4120fbedbb ALSA: usb-audio: Add "Keep Interface" control 
This patch adds "Keep Interface" control for each USB-audio device.
The control element is with SND_CTL_IFACE_CARD, so that it won't
appear on any sane mixer applications.  For a device that is confirmed
to work well with "keep-interface" mode, user can flip the control via
amixer, e.g.
  % amixer -c1 cset iface=CARD,name='Keep Interface' on

and save/restore the state via alsactl.

The reason to provide this via control API is that the behavior must
be pretty depending on the device (and the firmware in it), so it's
not ideal to apply via module option.

For a device that certainly works, we may set it statically via a
quirk table entry.  But a device like Dell WD15 dock behaves so
differently depending on the firmware, and we can't set it
statically.  So leave this as a dynamic switch each user can adjust
freely.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
2018-05-02 16:02:34 +02:00
..
6fire ALSA: 6fire: remove unused variable card 2017-10-16 14:48:49 +02:00
bcd2000 sound updates for 4.15-rc1 2017-11-14 18:01:46 -08:00
caiaq ASoC: Updates for v4.15 2017-11-13 15:45:57 +01:00
hiface ALSA: hiface: Add sanity checks for invalid EPs 2017-10-11 16:59:27 +02:00
line6 ALSA: line6: Use correct endpoint type for midi output 2018-04-12 08:42:07 +02:00
misc ALSA: usb: constify snd_pcm_ops structures 2017-08-19 11:02:27 +02:00
usx2y ALSA: usx2y: Change return type to vm_fault_t 2018-04-25 08:15:20 +02:00
card.c ALSA: usb: initial USB Audio Device Class 3.0 support 2018-03-21 11:46:33 +01:00
card.h ALSA: usb: initial USB Audio Device Class 3.0 support 2018-03-21 11:46:33 +01:00
clock.c ALSA: usb-audio: Add sanity checks in UAC3 clock parsers 2018-04-07 13:07:17 +02:00
clock.h ALSA: usb: initial USB Audio Device Class 3.0 support 2018-03-21 11:46:33 +01:00
debug.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
endpoint.c ALSA: usb-audio: test EP_FLAG_RUNNING at urb completion 2017-01-05 07:35:17 +01:00
endpoint.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
format.c ALSA: usb-audio: silence a static checker warning 2018-03-29 11:08:04 +02:00
format.h ALSA: usb: initial USB Audio Device Class 3.0 support 2018-03-21 11:46:33 +01:00
helper.c ALSA: usb-audio: correct speed checking 2016-05-08 11:42:04 +02:00
helper.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
Kconfig ALSA: us122l: enable compile testing 2017-05-15 11:02:14 +02:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
midi.c ALSA: usb-audio: Convert timers to use timer_setup() 2017-10-17 10:52:22 +02:00
midi.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
mixer_maps.c ALSA: usb-audio: Skip broken EU on Dell dock USB-audio 2018-04-24 13:39:30 +02:00
mixer_quirks.c ALSA: usb-audio: Initialize Dell Dock playback volumes 2018-05-02 16:02:32 +02:00
mixer_quirks.h ALSA: usb-audio: Initialize Dell Dock playback volumes 2018-05-02 16:02:32 +02:00
mixer_scarlett.c ALSA: usb-audio: constify snd_kcontrol_new structures 2017-02-21 22:02:03 +01:00
mixer_scarlett.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
mixer_us16x08.c ALSA: usb: Avoid VLA in mixer_us16x08.c 2017-05-31 08:46:19 +02:00
mixer_us16x08.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
mixer.c ALSA: usb-audio: Add "Keep Interface" control 2018-05-02 16:02:34 +02:00
mixer.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pcm.c ALSA: usb-audio: Add keep_iface flag 2018-05-02 16:02:33 +02:00
pcm.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
power.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
proc.c ALSA: usb-audio: Avoid nested autoresume calls 2015-08-26 15:38:25 +02:00
proc.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
quirks-table.h ALSA: usb-audio: Add a quirck for B&W PX headphones 2018-02-24 11:28:05 +01:00
quirks.c ALSA: usb-audio: add more quirks for DSD interfaces 2018-04-23 08:53:43 +02:00
quirks.h ALSA: usb-audio: move audioformat quirks to quirks.c 2018-03-19 17:00:12 +01:00
stream.c ALSA: usb-audio: ADC3: Fix channel mapping conversion for ADC3. 2018-04-24 19:54:56 +02:00
stream.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
usbaudio.h ALSA: usb-audio: Add keep_iface flag 2018-05-02 16:02:33 +02:00