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authorJorge Sanjuan <jorge.sanjuan@codethink.co.uk>2018-07-31 13:28:42 +0100
committerTakashi Iwai <tiwai@suse.de>2018-07-31 15:01:22 +0200
commit11785ef53228d23ec386f5fe4a34601536f0c891 (patch)
treeecdf75859e73b7671550204c42d1dd6949bb8288 /sound/usb/card.h
parent89b4ab213feb11a5bece544cfa12374f66c2c47c (diff)
downloadlinux-11785ef53228d23ec386f5fe4a34601536f0c891.tar.bz2
ALSA: usb-audio: Initial Power Domain support
Thee USB Audio Class 3 (UAC3) introduces Power Domains as a new feature to let a host turn individual parts of an audio function to different power states via USB requests. This lets the device get to know a bit amore about what the host is up to in order to optimize power consumption efficiently. The Power Domains are optional for UAC3 configuration but all UAC3 devices shall include at least one BADD configuration where the support for Power Domains is compulsory. This patch adds a set of features/helpers to parse these power domains and change their status. Signed-off-by: Jorge Sanjuan <jorge.sanjuan@codethink.co.uk> Signed-off-by: Takashi Iwai <tiwai@suse.de>
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