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ldisc: new dcd_change() method for line disciplines

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Signed-off-by: Rodolfo Giometti <giometti@linux.it>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Greg KH <greg@kroah.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Alexander Gordeev <lasaine@lvk.cs.msu.su>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Rodolfo Giometti 2010-03-10 15:23:45 -08:00 committed by Linus Torvalds
parent 697fb85fcf
commit b3e63afe8a
2 changed files with 12 additions and 0 deletions
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4
Documentation/serial/tty.txt
View file

@ -105,6 +105,10 @@ write_wakeup() - May be called at any point between open and close.
is permitted to call the driver write method from is permitted to call the driver write method from
this function. In such a situation defer it. this function. In such a situation defer it.
dcd_change() - Report to the tty line the current DCD pin status
changes and the relative timestamp. The timestamp
can be NULL.
Driver Access Driver Access

8
include/linux/tty_ldisc.h
View file

@ -99,6 +99,12 @@
* cease I/O to the tty driver. Can sleep. The driver should * cease I/O to the tty driver. Can sleep. The driver should
* seek to perform this action quickly but should wait until * seek to perform this action quickly but should wait until
* any pending driver I/O is completed. * any pending driver I/O is completed.
*
* void (*dcd_change)(struct tty_struct *tty, unsigned int status,
* struct timespec *ts)
*
* Tells the discipline that the DCD pin has changed its status and
* the relative timestamp. Pointer ts can be NULL.
*/ */
#include <linux/fs.h> #include <linux/fs.h>
@ -136,6 +142,8 @@ struct tty_ldisc_ops {
void (*receive_buf)(struct tty_struct *, const unsigned char *cp, void (*receive_buf)(struct tty_struct *, const unsigned char *cp,
char *fp, int count); char *fp, int count);
void (*write_wakeup)(struct tty_struct *); void (*write_wakeup)(struct tty_struct *);
void (*dcd_change)(struct tty_struct *, unsigned int,
struct timespec *);
struct module *owner; struct module *owner;