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termios: document callback more clearly

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Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Alan Cox 2007-11-28 16:21:28 -08:00 committed by Linus Torvalds
parent 05a462afe8
commit 3ac40b9b5e
1 changed files with 8 additions and 0 deletions
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8
Documentation/tty.txt
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@ -132,6 +132,14 @@ set_termios() Notify the tty driver that the device's termios
tty->termios. Previous settings should be passed in
the "old" argument.
The API is defined such that the driver should return
the actual modes selected. This means that the
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
virtual port) can provide NULL for this method.
throttle() Notify the tty driver that input buffers for the
line discipline are close to full, and it should
somehow signal that no more characters should be