hdac_ext_device 144 include/sound/hdaudio_ext.h struct hdac_ext_device; hdac_ext_device 148 include/sound/hdaudio_ext.h int (*build_controls)(struct hdac_ext_device *dev); hdac_ext_device 149 include/sound/hdaudio_ext.h int (*init)(struct hdac_ext_device *dev); hdac_ext_device 150 include/sound/hdaudio_ext.h void (*free)(struct hdac_ext_device *dev);