Use Alsa & Tinyalsa plugins to parameterize HW Codec

About alsa mixer controls

Codec vendors expose the available parameters of their HW through alsa mixer control interface. These controls can be listed using the amixer utility:

$amixer –c <card_number> controls

Output: numid=8,iface=MIXER,name='Headphone Playback Switch' numid=43,iface=MIXER,name='Headphone Playback Volume' ... numid=41,iface=MIXER,name='Lineout Mux'`