Commit b3e63afe authored by Rodolfo Giometti's avatar Rodolfo Giometti Committed by Linus Torvalds
Browse files

ldisc: new dcd_change() method for line disciplines 



Signed-off-by: default avatarRodolfo 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: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 697fb85f

Documentation/serial/tty.txt

+4 −0
Original line number Diff line number Diff line
@@ -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

			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

include/linux/tty_ldisc.h

+8 −0
Original line number Diff line number Diff line
@@ -99,6 +99,12 @@ 
 *	cease I/O to the tty driver. Can sleep. The driver should

 *	seek to perform this action quickly but should wait until

 *	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>
@@ -136,6 +142,8 @@ struct tty_ldisc_ops { 
	void	(*receive_buf)(struct tty_struct *, const unsigned char *cp,

			       char *fp, int count);

	void	(*write_wakeup)(struct tty_struct *);

	void	(*dcd_change)(struct tty_struct *, unsigned int,

				struct timespec *);



	struct  module *owner;