USB: visor: reimplement using generic framework
Kill custom read and write implementations (dynamically allocated write urbs). Note that I chose to remove the stat module parameter which was supposed to keep count of the amount of data sent and received, but which has been broken for three years (since b308e74d "USB: visor driver adapted to new tty buffering" -- bytes_in was incorrectly updated and was thus always reported as 0). Compile-only tested. Signed-off-by: NJohan Hovold <jhovold@gmail.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
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