driver function is responsible for modifying any
bits in the request it cannot fulfill to indicate
the actual modes being used. A device with no
- hardware capability for change (eg a USB dongle or
+ hardware capability for change (e.g. a USB dongle or
virtual port) can provide NULL for this method.
throttle() Notify the tty driver that input buffers for the
flush_chars() - Ask the kernel to write put_char queue
-write_room() - Return the number of characters tht can be stuffed
+write_room() - Return the number of characters that can be stuffed
into the port buffers without overflow (or less).
The ldisc is responsible for being intelligent
about multi-threading of write_room/write calls