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serial: add a new helper function

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In most of the time, the driver needs to check if the cts flow control
is enabled. But now, the driver checks the ASYNC_CTS_FLOW flag manually,
which is not a grace way. So add a new wraper function to make the code
tidy and clean.

Signed-off-by: Huang Shijie <shijie8@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Huang Shijie 2012-08-22 22:13:36 -04:00 • committed by Greg Kroah-Hartman
commit f21ec3d2d4
13 changed files with 20 additions and 14 deletions
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6
include/linux/tty.h
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@ -514,6 +514,12 @@ static inline struct tty_port *tty_port_get(struct tty_port *port)
return port;
}
/* If the cts flow control is enabled, return true. */
static inline bool tty_port_cts_enabled(struct tty_port *port)
{
return port->flags & ASYNC_CTS_FLOW;
}
extern struct tty_struct *tty_port_tty_get(struct tty_port *port);
extern void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty);
extern int tty_port_carrier_raised(struct tty_port *port);