[PATCH] USB: io_ti new devices, circular buffer, flow control, misc fixes

- Updated to version 0.7.

- Added support for Edgeport 4s, 221c, 22c, 21c, 1, 1i, Watchports,
  Plus Power Port HP4CD, and Plus Power Port PCI.

- Added a circular write buffer and locking to protect it.  This fixes
  OPOST processing problems.

- Rewrote TIChase to wait for the circular buffer to drain, to wait
  up to the closing wait time, and to wait for the last character out.

- Fixed hardware flow control by having it stop and restart reads
  and set and clear tty->hw_stopped.

- Removed the RELEVANT_IFLAG macro which mistakenly filtered out the
  software flow control stty flags.

- Added a semaphore to to protect num_ports_open to fix a race
  during simultaneous opens--two opens could both try to submit
  the interrupt urb, an error.

- Added a separate write_urb_in_use flag rather than relying
  on (urb->status == -EINPROGRESS).

- Added edge_tty_recv to pass data to the tty flip buffers.

- Freed memory on failed startup.

- Added low latency as a module parameter, it is on by default.

- Added closing wait as a module parameter, it is 40 seconds by default.

- Simplified rounding the baud rate divisor.

- Added some error messages.
Signed-off-by: Al Borchers <alborchers@steinerpoint.com>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>