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TODO revision 1.21 
      1   1.1  augustss Some things that need to be done in no particular order:
      2   1.7  augustss --------------------------------------------------------
      3   1.1  augustss 
      4  1.21  augustss Find race condition in UHCI driver.  Rarely (under heavy USB load) you get a
      5  1.21  augustss "uhci_idone: ii=0x%x is done!".  This "cannot happen".
      6  1.21  augustss 
      7  1.11  augustss Add lots of bus_dmamap_sync().
      8  1.11  augustss 
      9   1.2  augustss Do bandwidth accounting.
     10   1.2  augustss 
     11   1.2  augustss Use lock manager locks.
     12   1.2  augustss 
     13   1.5  augustss Use the pool allocator for TDs et al.
     14   1.5  augustss 
     15   1.6  augustss Throw out more USBDI gunk.
     16   1.7  augustss 
     17  1.13  augustss Make hub driver notice transition between self and bus powered state.
     18  1.21  augustss Some hubs change the number of available ports on this transition. :(
     19   1.7  augustss Handle overcurrent conditions.
     20  1.13  augustss 
     21  1.13  augustss Make it possible to open any device in a "generic" way, i.e., like ugen.
     22  1.13  augustss 
     23  1.13  augustss Rewrite mouse and keyboard driver to handle devices which use the
     24  1.13  augustss report ID.  One way would be to attach ums and ukbd to uhid.
     25  1.13  augustss 
     26  1.13  augustss Rotate the QHs for bulk transport to get fairer scheduling.
     27  1.13  augustss 
     28  1.13  augustss Change HC drivers to queue multiple request for an endpoint
     29  1.13  augustss to get better performance.
     30  1.13  augustss 
     31  1.13  augustss Add generic ucom layer for serial adapters.
     32  1.14  augustss 
     33  1.14  augustss Add isoc to OHCI driver.
     34  1.14  augustss 
     35  1.20  augustss Do memory deallocation when HC driver is deactivated.
     36  1.20  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  1.15  augustss 
     43  1.17  augustss Stylistic changes:
     44  1.17  augustss 	use NULL not 0
     45  1.17  augustss 	declare all local definitions static
     46  1.17  augustss 	rename s/request/xfer/
     47  1.17  augustss 	use usb_ and usbd_ consistently
     48  1.18  augustss 	rename s/r/err/
     49  1.18  augustss 	use implicit test for no err
     50  1.17  augustss 	indent continuation lines according to KNF
     51  1.17  augustss 	rearrange the contents and names of some files (Nick)
     52  1.17  augustss 
     53  1.10  augustss Document device driver API.
     54  1.10  augustss 
     55  1.10  augustss Document HC driver API.
     56