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TODO revision 1.14
      1   1.1  augustss Some things that need to be done in no particular order:
      2   1.7  augustss --------------------------------------------------------
      3   1.1  augustss 
      4  1.11  augustss Add lots of bus_dmamap_sync().
      5  1.11  augustss 
      6   1.2  augustss Do bandwidth accounting.
      7   1.2  augustss 
      8   1.2  augustss Use lock manager locks.
      9   1.2  augustss 
     10   1.5  augustss Use the pool allocator for TDs et al.
     11   1.5  augustss 
     12   1.6  augustss Throw out more USBDI gunk.
     13   1.7  augustss 
     14  1.13  augustss Make hub driver notice transition between self and bus powered state.
     15   1.7  augustss Handle overcurrent conditions.
     16   1.8  augustss 
     17   1.8  augustss Move memory allocation and copying to HC independent code.
     18   1.9  augustss 
     19   1.9  augustss Use a TD chain in ohci.c to allow transfers > 8K.
     20  1.13  augustss 
     21  1.13  augustss Add an event mechanism to find out about attach and detach.
     22  1.13  augustss 
     23  1.13  augustss Make it possible to open any device in a "generic" way, i.e., like ugen.
     24  1.13  augustss 
     25  1.13  augustss Rewrite mouse and keyboard driver to handle devices which use the
     26  1.13  augustss report ID.  One way would be to attach ums and ukbd to uhid.
     27  1.13  augustss 
     28  1.13  augustss Rotate the QHs for bulk transport to get fairer scheduling.
     29  1.13  augustss 
     30  1.13  augustss Change HC drivers to queue multiple request for an endpoint
     31  1.13  augustss to get better performance.
     32  1.13  augustss 
     33  1.13  augustss Add generic ucom layer for serial adapters.
     34  1.14  augustss 
     35  1.14  augustss Add isoc to OHCI driver.
     36  1.14  augustss 
     37  1.14  augustss uaudio problems:
     38  1.14  augustss 	mixer names are awful, use some heuristics.
     39  1.14  augustss 	implement selector units
     40  1.14  augustss 	implement input
     41  1.14  augustss 	test with more devices
     42  1.10  augustss 
     43  1.10  augustss Document device driver API.
     44  1.10  augustss 
     45  1.10  augustss Document HC driver API.
     46