ALSA: hda - support OLPC XO-1.5 DC input
The XO's audio hardware is wired up to allow DC sensors (e.g. light sensors, thermistors, etc) to be plugged in through the microphone jack. Add sound mixer controls to allow this mode to be enabled and tweaked. Signed-off-by: NDaniel Drake <dsd@laptop.org> Signed-off-by: NJaroslav Kysela <perex@perex.cz>
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