1. 12 6月, 2010 1 次提交
  2. 01 6月, 2010 1 次提交
    • D
      ALSA: usb-audio: parse clock topology of UAC2 devices · 79f920fb
      Daniel Mack 提交于
      Audio devices which comply to the UAC2 standard can export complex clock
      topologies in its descriptors and set up links between them.
      
      The entities that are defined are
      
       - clock sources, which define the end-leafs.
       - clock selectors, which act as switch to select one out of many
         possible clocks sources.
       - clock multipliers, which have an input clock source, and act as clock
         source again. They can be used to derive one clock from another.
      
      All sample rate changes, clock validity queries and the like must go to
      clock source elements, while clock selectors and multipliers can be used
      as terminal clock source.
      
      The following patch adds a parser for these elements and functions to
      iterate over the tree and find the leaf nodes (clock sources).
      
      The samplerate set functions were moved to the new clock.c file.
      Signed-off-by: NDaniel Mack <daniel@caiaq.de>
      Signed-off-by: NTakashi Iwai <tiwai@suse.de>
      79f920fb